From clp2 at rebertia.com  Mon Mar  1 01:30:45 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 28 Feb 2010 22:30:45 -0800
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <4b8b5cef$0$1625$742ec2ed@news.sonic.net>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<4b8b5cef$0$1625$742ec2ed@news.sonic.net>
Message-ID: <50697b2c1002282230v2f421944u5866685a985fd904@mail.gmail.com>

On Sun, Feb 28, 2010 at 10:39 PM, John Nagle <nagle at animats.com> wrote:
> Patrick Maupin wrote:
>>
>> All:
>>
>> Finding .ini configuration files too limiting, JSON and XML to hard to
>> manually edit, and YAML too complex to parse quickly, I have started
>> work on a new configuration file parser.
>
> ? You're not supposed to edit those formats manually.

Huh? True for XML /perhaps/, but for the others I quite disagree.
Perhaps you could explain your reasoning?

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


From nagle at animats.com  Mon Mar  1 01:39:56 2010
From: nagle at animats.com (John Nagle)
Date: Sun, 28 Feb 2010 22:39:56 -0800
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <mailman.34.1267409372.23598.python-list@python.org>
References: <mailman.34.1267409372.23598.python-list@python.org>
Message-ID: <4b8b5cef$0$1625$742ec2ed@news.sonic.net>

Patrick Maupin wrote:
> All:
> 
> Finding .ini configuration files too limiting, JSON and XML to hard to
> manually edit, and YAML too complex to parse quickly, I have started
> work on a new configuration file parser.

    You're not supposed to edit those formats manually.

					John Nagle


From rantingrick at gmail.com  Mon Mar  1 01:41:26 2010
From: rantingrick at gmail.com (rantingrick)
Date: Sun, 28 Feb 2010 22:41:26 -0800 (PST)
Subject: Sample code usable Tkinter listbox
References: <hmf1qo$v9v$1@news.eternal-september.org>
	<5af8af6d-ecfc-4e4e-bba6-3622bbe874eb@o3g2000yqb.googlegroups.com>
	<hmfdvg$vu8$1@news.eternal-september.org>
Message-ID: <0f801cb4-20fc-4955-bdf6-ec7a2bc5cecb@g19g2000yqe.googlegroups.com>

On Feb 28, 9:57?pm, "Alf P. Steinbach" <al... at start.no> wrote:
> * rantingrick:

I just hate overriding all the paths to each listbox method. How about
just overideing the Listboxe's  geomerty methods once an your done?


#-- start script --#
import Tkinter as tk
from Tkconstants import *
import tkMessageBox as MB

class ScrolledList(tk.Listbox):
    def __init__(self, master, **kw):
        self.frame = tk.Frame(master)
        self.frame.rowconfigure(0, weight=1)
        self.frame.columnconfigure(0, weight=1)
        self.hbar = tk.Scrollbar(self.frame, orient=HORIZONTAL)
        self.block = tk.Frame(self.frame, width=18, height=18)
        self.block.grid(row=1, column=1)
        self.vbar = tk.Scrollbar(self.frame, orient=VERTICAL)
        kw.setdefault('activestyle', 'none')
        kw.setdefault('highlightthickness', 0)
        if 'pack' in kw.keys() and kw.pop('pack') == 1:
            self.frame.pack(fill=BOTH, expand=1)
        tk.Listbox.__init__(self, self.frame, **kw)
        self.grid(row=0, column=0, sticky=N+S+E+W)
        self.hbar.configure(command=self.xview)
        self.vbar.configure(command=self.yview)
        self.config(
            yscrollcommand=self.vbar.set,
            xscrollcommand=self.hbar.set
            )
        self.hbar.grid(row=1, column=0, sticky=W+E)
        self.vbar.grid(row=0, column=1, sticky=N+S)

        self.pack = lambda **kw: self.frame.pack(**kw)
        self.grid = lambda **kw: self.frame.grid(**kw)
        self.place = lambda **kw: self.frame.place(**kw)
        self.pack_config = lambda **kw: self.frame.pack_config(**kw)
        self.grid_config = lambda **kw: self.frame.grid_config(**kw)
        self.place_config = lambda **kw: self.frame.place_config(**kw)
        self.pack_configure = lambda **kw:
self.frame.pack_config(**kw)
        self.grid_configure = lambda **kw:
self.frame.grid_config(**kw)
        self.place_configure = lambda **kw:
self.frame.place_config(**kw)

    def gets(self):
        return self.get(0, END)

    def sets(self, arg):
        self.delete(0, END)
        try:
            arg = arg.strip('\n').splitlines()
        except AttributeError:
            pass
        if hasattr(arg, '__getitem__'):
            for item in arg:
                self.insert(END, str(item))
        else:
            raise TypeError("Scrolledlist.sets() requires a string of
iterable of strings")


if __name__ == '__main__':
    root = tk.Tk()
    listbox = ScrolledList(root, width=50, height=5, fg='green',
selectmode='Extended', pack=1)
    #listbox.sets(1.25)
    #listbox.sets('1\n2\n3\n4\n5\n\n\n')
    listbox.sets(range(100))
    root.mainloop()
#-- end script --#


From stefan_ml at behnel.de  Mon Mar  1 02:46:04 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Mon, 01 Mar 2010 08:46:04 +0100
Subject: stripping fields from xml file into a csv
In-Reply-To: <d83aff2e-6c28-4e99-b765-8f2cdbb282ab@g26g2000yqn.googlegroups.com>
References: <af06c4aa-04ea-4b63-b54b-b14539a47525@a18g2000yqc.googlegroups.com>	<mailman.11.1267344325.23598.python-list@python.org>	<7431a354-b9cb-490b-8b8b-b8f73d9698a8@s36g2000prf.googlegroups.com>	<mailman.24.1267384838.23598.python-list@python.org>
	<d83aff2e-6c28-4e99-b765-8f2cdbb282ab@g26g2000yqn.googlegroups.com>
Message-ID: <hmfrbs$9d6$1@dough.gmane.org>

Hal Styli, 01.03.2010 00:15:
> Stefan, I was happy to see such concise code.
> Your python worked with only very minor modifications.
> 
> Hai's test xml data *without* the first and last line is close enough
> to the data I am using:
> 
> <order customer="john" product="eggs" quantity="12" />
> <order customer="cindy" product="bread" quantity="1" />
> <order customer="larry" product="tea bags" quantity="100" />
> <order customer="john" product="butter" quantity="1" />
> <order product="chicken" quantity="2" customer="derek" />
> 
> ... quirky.
>
> I  get a large file given to me in this format. I believe it is
> created by something like:
> grep 'customer=' *.xml, where there are a large number of  xml files.

Try to get this fixed at the source. Exporting non-XML that looks like XML
is not a good idea in general, and it means that everyone who wants to read
the data has to adapt, instead of fixing the source once and for all.


> I had to edit the data to include the first and last lines, <orders>
> and </orders>,
> to get the python code to work. It's not an arduous task(!), but can
> you recommend a way to get it to work without
> manually editing the data?

Iff this cannot be fixed at the source, you can write a file-like wrapper
around a file that simply returns the boundary tags before and after
reading from the file itself. All you need is a .read(n) method, see the
documentation of the file type.


> One other thing, what's the Roland Mueller post above about (I'm
> viewing htis in google groups)? What would the test.xsl file look
> like?

This is the XSLT script he posted:

============================
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:fo="http://www.w3.org/1999/XSL/Format"
  version="1.0">

<!-- text output because we want to have an CSV file -->
<xsl:output method="text"/>

<!-- remove all whitespace coming with input XML -->
<xsl:strip-space elements="*"/>

<!-- matches any <order> element and extracts the customer,product&quantity
attributes -->
<xsl:template match="order">
  <xsl:value-of select="@customer"/>
  <xsl:text>,</xsl:text>
  <xsl:value-of select="@product"/>
  <xsl:text>,</xsl:text>
  <xsl:value-of select="@quantity"/>
  <xsl:text>
</xsl:text>
</xsl:template>

</xsl:stylesheet>
============================

Stefan



From steven.bethard at gmail.com  Mon Mar  1 03:31:09 2010
From: steven.bethard at gmail.com (Steven Bethard)
Date: Mon, 1 Mar 2010 00:31:09 -0800
Subject: [ANN] argparse 1.1 - Command-line parsing library
Message-ID: <d11dcfba1003010031i3daa4bcfp40ac18622127b82b@mail.gmail.com>

=======================
Announcing argparse 1.1
=======================
The argparse module provides an easy, declarative interface for
creating command line tools, which knows how to:
 * parse the arguments and flags from sys.argv
 * convert arg strings into objects for your program
 * format and print informative help messages
 * and much more...

The argparse module improves on the standard library optparse module
in a number of ways including:
 * handling positional arguments
 * supporting sub-commands
 * allowing alternative option prefixes like + and /
 * handling zero-or-more and one-or-more style arguments
 * producing more informative usage messages
 * providing a much simpler interface for custom types and actions

Download argparse
=================
The argparse homepage has links for source, MSI and single file
distributions of argparse:
 http://code.google.com/p/argparse/

About this release
==================
This is the final release of argparse before its move to the Python
2.7 and 3.2 standard libraries. Major enhancements in this release:

* ArgumentParser(..., version=XXX) is deprecated. Instead, you should
  use add_argument(..., action='version') which is more flexible and
  does not force you to accept -v/--version as your version flags.

* Usage and help (but not version) messages are now written to stdout
  instead of stderr, consistent with most existing programs.

* User defined types passed as a type= argument can now raise an
  ArgumentTypeError to provide a custom error message.

* Namespace objects now support containment, e.g. "'foo' in args".

Various bugs were also squashed, e.g. "from argparse import *" now
works. See the news file for detailed information:

  http://argparse.googlecode.com/svn/tags/r11/NEWS.txt

Enjoy!

Steve
-- 
Where did you get that preposterous hypothesis?
Did Steve tell you that?
        --- The Hiphopopotamus


From anthra.norell at bluewin.ch  Mon Mar  1 04:17:59 2010
From: anthra.norell at bluewin.ch (Anthra Norell)
Date: Mon, 01 Mar 2010 10:17:59 +0100
Subject: Six Minutes and fourty two seconds
In-Reply-To: <63Vhn.92$1n5.11@newsfe04.iad>
References: <63Vhn.92$1n5.11@newsfe04.iad>
Message-ID: <4B8B8647.1040008@bluewin.ch>

Tobiah wrote:
> Now that I use python, this is the amount of time 
> per day that I spend adding forgotten semicolons while
> debugging other languages.
>   
What compels you to write Python code without semicolons?

Frederic



From chris at simplistix.co.uk  Mon Mar  1 04:38:13 2010
From: chris at simplistix.co.uk (Chris Withers)
Date: Mon, 01 Mar 2010 09:38:13 +0000
Subject: How to use python to register a service (an existing .exe file)
In-Reply-To: <hln9ib$dp4$1@panix5.panix.com>
References: <4b79e28c$0$4610$426a74cc@news.free.fr>
	<hln9ib$dp4$1@panix5.panix.com>
Message-ID: <4B8B8B05.3060407@simplistix.co.uk>

Aahz wrote:
> In article <4b79e28c$0$4610$426a74cc at news.free.fr>,
> News123  <news123 at free.fr> wrote:
> 
>> Is there a python way to register new windows services.
>>
>> I am aware of the
>> instsrv.exe program, which can be used to install services.
>> I could use subprocess.Popen to call
>>
>> instsrv.exe "service_name" program.exe
>>
>> but wondered, whether there's already an existing function.
> 
> Use the win32 package.

Indeed, there's some intersting code in this area here:

http://svn.zope.org/Zope/trunk/src/nt_svcutils/service.py?rev=104819&view=auto

http://svn.zope.org/Zope/trunk/src/Zope2/Startup/zopectl.py?rev=105396&view=auto

...particularly in the do_install function in the latter...

Chris


-- 
Simplistix - Content Management, Batch Processing & Python Consulting
             - http://www.simplistix.co.uk



From bartsmeets86 at gmail.com  Mon Mar  1 04:48:05 2010
From: bartsmeets86 at gmail.com (Bart Smeets)
Date: Mon, 1 Mar 2010 10:48:05 +0100
Subject: Detecting new removable drives in Linux
Message-ID: <2119ee91003010148u4954d495kd53454c27f2b54b2@mail.gmail.com>

Hello,

I'm trying to write a script which detects when a new removable drive is
connected to the computer. On #python I was advised to use the
dbus-bindings. However the documentation on this is limited. Does anyone
know of an example of how I can detect new removable drives?

Thanks in advance!
Regards,
Bart
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From jeanmichel at sequans.com  Mon Mar  1 05:34:45 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 01 Mar 2010 11:34:45 +0100
Subject: Docstrings considered too complicated
In-Reply-To: <4B89D8BE.2040905@mrabarnett.plus.com>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>
	<4B89D8BE.2040905@mrabarnett.plus.com>
Message-ID: <4B8B9845.70604@sequans.com>

MRAB wrote:
> Gregory Ewing wrote:
>> Mel wrote:
>>
>>> You could think of it as a not bad use of the design principle 
>>> "Clear The Simple Stuff Out Of The Way First".  Destinations are 
>>> commonly a lot simpler than sources
>>
>> That's not usually true in assembly languages, though,
>> where the source and destination are both very restricted
>> and often about the same complexity.
>>
>> That's not to say that right-to-left is the wrong way
>> to do it in an assembly language, but there are less
>> misleading words than "move" that could be used.
>>
>> Z80 assembly language uses "load", which makes things
>> considerably clearer:
>>
>>   LD A, B  ; load A with B
>>
> Some processors distinguish between "load" (memory to register) and
> "store" (register to memory), and the destination and LHS operand of
> binary operations might be the same register, for example:
>
>     CLC ; clear the carry
>     LDA first ; accumulator := byte at first
>     ADCA second ; accumulator := accumulator + byte at second + carry
>     STA result ; byte at third := accumulator
>
Guys, you sound like people arguing about old school TV show / series 
like star treck :-)
- "He was wearing a blue suit !"
- "Check episode number 29, he appeared with a pink one!"

I'm glad I'm too young to had to code in assembler, or to bear the 
vision of those unlikely space suits from the 70's ;-)

JM


From lucaberto at libero.it  Mon Mar  1 05:48:34 2010
From: lucaberto at libero.it (luca72)
Date: Mon, 1 Mar 2010 02:48:34 -0800 (PST)
Subject: pythonpath
Message-ID: <7b9322bb-0b63-44e4-94c5-324006adff8b@t23g2000yqt.googlegroups.com>

Sorry for my stupid question if i have to load module from a folder i
have to append it to the sys path the folder?
ex:
if my  folder module is  /home/lucak904/Scrivania/Luca/enigma2
i do this :
import sys
sys.path.append('/home/lucak904/Scrivania/Luca/enigma2')
If this is correct why when i write:
form enigma2 import *
i get no module named enigma2

Thanks
Luca

I'm under linux




From candide at free.invalid  Mon Mar  1 05:58:57 2010
From: candide at free.invalid (candide)
Date: Mon, 01 Mar 2010 11:58:57 +0100
Subject: Starting Python from the terminal with no welcome message
In-Reply-To: <mailman.33.1267406497.23598.python-list@python.org>
References: <4b8afafa$0$28635$426a74cc@news.free.fr>
	<mailman.33.1267406497.23598.python-list@python.org>
Message-ID: <4b8b9df2$0$10478$426a74cc@news.free.fr>

Tim Chase a ?crit :

> 
>   bash$ python -ic ""
> 
> to get a python shell without the banner.
>


Works fine. thanks a lot.


From nanyaks at googlemail.com  Mon Mar  1 07:01:08 2010
From: nanyaks at googlemail.com (simn_stv)
Date: Mon, 1 Mar 2010 04:01:08 -0800 (PST)
Subject: taking python enterprise level?...
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<hm5mfo$mg1$1@news.eternal-september.org>
Message-ID: <d6e7c238-af52-4490-bf14-7c0edbe57051@g11g2000yqe.googlegroups.com>

On Feb 25, 12:21 pm, "Martin P. Hellwig" <martin.hell... at dcuktec.org>
wrote:
> On 02/25/10 10:26, simn_stv wrote:
> <cut>> what i am concerned about is scalability and
> > efficiency, well, as far as the 'core' is concerned.
>
> > would python be able to manage giving me a solid 'core' and will i be
> > able to use python provide any API i would like to implement?...
>
> <cut>
> Python isn't the most efficient language, the assembler provided by the
> maker of your CPU probably is the best you can get,
<cut>
LOL...;), yeah right, the mere thought of writing assembler
instructions is SCARY!!

>everything after
> that is a trade-off between performance and flexibility (flexible in the
> most flexible sense of the word :-)).
>
> That being said, for me, Python (well actually any turing complete
> programming language), is more like a box of lego with infinite amount
> of pieces.
> Scalability and API issues are the same as the shape and function of the
> model your making with lego.
>
> Sure some type of pieces might be more suited than other types but since
> you can simulate any type of piece with the ones that are already
> present, you are more limited by your imagination than by the language.
>
> So in short, I don't see any serious problems using Python, I have used
> it in Enterprise environments without any problems but than again I was
> aware not to use it for numerical intensive parts without the use of 3rd
> party libraries like numpy. Which for me resulted in not doing the
> compression of a database delta's in pure python but to offload that to
> a more suitable external program, still controlled from Python though.
>
> --
> mph



From marduk at python.net  Mon Mar  1 07:09:38 2010
From: marduk at python.net (Albert Hopkins)
Date: Mon, 01 Mar 2010 07:09:38 -0500
Subject: Detecting new removable drives in Linux
In-Reply-To: <2119ee91003010148u4954d495kd53454c27f2b54b2@mail.gmail.com>
References: <2119ee91003010148u4954d495kd53454c27f2b54b2@mail.gmail.com>
Message-ID: <1267445378.72674.3.camel@centar>

On Mon, 2010-03-01 at 10:48 +0100, Bart Smeets wrote:
> Hello,
> 
> 
> I'm trying to write a script which detects when a new removable drive
> is connected to the computer. On #python I was advised to use the
> dbus-bindings. However the documentation on this is limited. Does
> anyone know of an example of how I can detect new removable drives?

The documentation does suck and, at least for the python bindings, is
horribly outdated.

Also, the python bindings for dbus are not as "pythonic" as they could
be.  I was working on a python/dbus program a while back and basically
had to resort to looking at the source of a program that did, or almost
did, what I wanted and using that as an example.

You may even want to look at C sources as I don't think the python
bindings are that much different.

HTH,
-a





From lyh19901223 at gmail.com  Mon Mar  1 07:10:55 2010
From: lyh19901223 at gmail.com (=?UTF-8?B?5YiY5a6H6L6J?=)
Date: Mon, 1 Mar 2010 12:10:55 +0000
Subject: pythonpath
Message-ID: <b61e184d1003010410v1c27067epd10b25d563fdb360@mail.gmail.com>

>Sorry for my stupid question if i have to load module >from a folder ihave
to append it to the sys path the >folder?
>ex:
>if my  folder module is  /home/lucak904/Scrivania/Luca/enigma2
>i do this :
>import sys
>sys.path.append('/home/lucak904/Scrivania/Luca/enigma2')
>If this is correct why when i write:
>form enigma2 import *
>i get no module named enigma2

is  the folder module  /home/lucak904/Scrivania/Luca/enigma2.py?   i think
the extension  is necessary .

-- 
wolf python london
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From nanyaks at googlemail.com  Mon Mar  1 07:11:07 2010
From: nanyaks at googlemail.com (simn_stv)
Date: Mon, 1 Mar 2010 04:11:07 -0800 (PST)
Subject: taking python enterprise level?...
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<mailman.233.1267106234.4577.python-list@python.org>
	<hm650q$esk$1@news.eternal-september.org> 
	<mailman.244.1267114628.4577.python-list@python.org>
Message-ID: <e64e9273-6d28-4a94-b337-ce5e019e4ea6@z35g2000yqd.googlegroups.com>

On Feb 25, 5:18 pm, "D'Arcy J.M. Cain" <da... at druid.net> wrote:
> On Thu, 25 Feb 2010 15:29:34 +0000
> "Martin P. Hellwig" <martin.hell... at dcuktec.org> wrote:
>
> > On 02/25/10 13:58, D'Arcy J.M. Cain wrote:
> > > On Thu, 25 Feb 2010 02:26:18 -0800 (PST)
> > <cut>
> > > Our biggest problem was in
> > > a network heavy element of the app and that was low level TCP/IP stuff
> > > that rather than being Python's problem was something we used Python to
> > > fix.
> > <cut>
> > Out off interest, could you elaborate on that?
>
> Somewhat - there is an NDA so I can't give exact details.  It was
> crucial to our app that we sync up databases in Canada and the US (later
> Britain, Europe and Japan) in real time with those transactions.  Our
> problem was that even though our two server systems were on the
> backbone, indeed with the same major carrier, we could not keep them in
> sync.  We were taking way to long to transact an update across the
> network.
>
> The problem had to do with the way TCP/IP works, especially closer to
> the core.  Our provider was collecting data and sending it only after
> filling a buffer or after a timeout.  The timeout was short so it
> wouldn't normally be noticed and in most cases (web pages e.g.) the
> connection is opened, data is pushed and the connection is closed so
> the buffer is flushed immediately.  Our patterns were different so we
> were hitting the timeout on every single transaction and there was no
> way we would have been able to keep up.
>
> Our first crack at fixing this was to simply add garbage to the packet
> we were sending.  Making the packets an order of magnitude bigger sped
> up the proccessing dramatically.  That wasn't a very clean solution
> though so we looked for a better way.
>
> That better way turned out to asynchronous update transactions.  All we
> did was keep feeding updates to the remote site and forget about ACKS.
> We then had a second process which handled ACKS and tracked which
> packets had been properly transferred.  The system had IDs on each
> update and retries happened if ACKS didn't happen soon enough.
> Naturally we ignored ACKS that we had already processed.
>
> All of the above (and much more complexity not even discussed here) was
> handled by Python code and database manipulation.  There were a few
> bumps along the way but overall it worked fine.  If we were using C or
> even assembler we would not have sped up anything and the solution we
> came up with would have been horrendous to code.  As it was I and my
> chief programmer locked ourselves in the boardroom and had a working
> solution before the day was out.

sure it wouldnt have sped it up a bit, even a bit?; probably the
development and maintenance time would be a nightmare but it should
speed the app up a bit...

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

seriously added to the reputation of python, from my own
perspective...kudos python!


From marduk at python.net  Mon Mar  1 07:14:19 2010
From: marduk at python.net (Albert Hopkins)
Date: Mon, 01 Mar 2010 07:14:19 -0500
Subject: pythonpath
In-Reply-To: <7b9322bb-0b63-44e4-94c5-324006adff8b@t23g2000yqt.googlegroups.com>
References: <7b9322bb-0b63-44e4-94c5-324006adff8b@t23g2000yqt.googlegroups.com>
Message-ID: <1267445659.72674.8.camel@centar>

On Mon, 2010-03-01 at 02:48 -0800, luca72 wrote:
> Sorry for my stupid question if i have to load module from a folder i
> have to append it to the sys path the folder?
> ex:
> if my  folder module is  /home/lucak904/Scrivania/Luca/enigma2
> i do this :
> import sys
> sys.path.append('/home/lucak904/Scrivania/Luca/enigma2')
> If this is correct why when i write:
> form enigma2 import *
> i get no module named enigma2

There are two reasons for this:

     1. enigma2 is not in your namespace.  What's inside enigma is.  For
        example, you can't say "from site-packages import *"  because
        Python doesn't look at "site-packages". It looks at what's
        inside site-packages.  If you wanted" enigma2" to be in your
        namespace, you should add /home/lucak904/Scrivania/Luca" to your
        system path.
     2. Even if you did above, it may not work because enigma2 is a
        directory. Remember "from x import *" only works for modules and
        packages, so if you want "enigma2" to be a package, remember to
        add an (empty) __init__.py to the directory.

Hope this helps.
-a




From alfps at start.no  Mon Mar  1 07:19:32 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Mon, 01 Mar 2010 13:19:32 +0100
Subject: Sample code usable Tkinter listbox
In-Reply-To: <0f801cb4-20fc-4955-bdf6-ec7a2bc5cecb@g19g2000yqe.googlegroups.com>
References: <hmf1qo$v9v$1@news.eternal-september.org>
	<5af8af6d-ecfc-4e4e-bba6-3622bbe874eb@o3g2000yqb.googlegroups.com>
	<hmfdvg$vu8$1@news.eternal-september.org>
	<0f801cb4-20fc-4955-bdf6-ec7a2bc5cecb@g19g2000yqe.googlegroups.com>
Message-ID: <hmgbco$blv$1@news.eternal-september.org>

* rantingrick:
> 
>         kw.setdefault('activestyle', 'none')

Hm, let me steal this line... Thanks!


Cheers,

- Alf


From nanyaks at googlemail.com  Mon Mar  1 07:27:12 2010
From: nanyaks at googlemail.com (simn_stv)
Date: Mon, 1 Mar 2010 04:27:12 -0800 (PST)
Subject: taking python enterprise level?...
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<mailman.233.1267106234.4577.python-list@python.org>
	<hm650q$esk$1@news.eternal-september.org> 
	<mailman.244.1267114628.4577.python-list@python.org>
Message-ID: <79ff2083-bde8-4a60-854d-b90e3d944b94@y17g2000yqd.googlegroups.com>

On Feb 25, 5:18 pm, "D'Arcy J.M. Cain" <da... at druid.net> wrote:
> On Thu, 25 Feb 2010 15:29:34 +0000
> "Martin P. Hellwig" <martin.hell... at dcuktec.org> wrote:
>
> > On 02/25/10 13:58, D'Arcy J.M. Cain wrote:
> > > On Thu, 25 Feb 2010 02:26:18 -0800 (PST)
> > <cut>
> > > Our biggest problem was in
> > > a network heavy element of the app and that was low level TCP/IP stuff
> > > that rather than being Python's problem was something we used Python to
> > > fix.
> > <cut>
> > Out off interest, could you elaborate on that?
>
> Somewhat - there is an NDA so I can't give exact details.  It was
> crucial to our app that we sync up databases in Canada and the US (later
> Britain, Europe and Japan) in real time with those transactions.  Our
> problem was that even though our two server systems were on the
> backbone, indeed with the same major carrier, we could not keep them in
> sync.  We were taking way to long to transact an update across the
> network.
>
> The problem had to do with the way TCP/IP works, especially closer to
> the core.  Our provider was collecting data and sending it only after
> filling a buffer or after a timeout.  The timeout was short so it
> wouldn't normally be noticed and in most cases (web pages e.g.) the
> connection is opened, data is pushed and the connection is closed so
> the buffer is flushed immediately.  Our patterns were different so we
> were hitting the timeout on every single transaction and there was no
> way we would have been able to keep up.
>
> Our first crack at fixing this was to simply add garbage to the packet
> we were sending.  Making the packets an order of magnitude bigger sped
> up the proccessing dramatically.  That wasn't a very clean solution
> though so we looked for a better way.
>
> That better way turned out to asynchronous update transactions.  All we
> did was keep feeding updates to the remote site and forget about ACKS.
> We then had a second process which handled ACKS and tracked which
> packets had been properly transferred.  The system had IDs on each
> update and retries happened if ACKS didn't happen soon enough.
> Naturally we ignored ACKS that we had already processed.
>
> All of the above (and much more complexity not even discussed here) was
> handled by Python code and database manipulation.  There were a few
> bumps along the way but overall it worked fine.  If we were using C or
> even assembler we would not have sped up anything and the solution we
> came up with would have been horrendous to code.  As it was I and my
> chief programmer locked ourselves in the boardroom and had a working
> solution before the day was out.

sure it wouldnt have sped it up a bit, even a bit?; probably the
development and maintenance time would be a nightmare but it should
speed the app up a bit...

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

seriously added to the reputation of python, from my own
perspective...kudos python!


From nanyaks at googlemail.com  Mon Mar  1 07:32:16 2010
From: nanyaks at googlemail.com (simn_stv)
Date: Mon, 1 Mar 2010 04:32:16 -0800 (PST)
Subject: taking python enterprise level?...
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>
Message-ID: <6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>

On Feb 26, 10:32 am, mdipierro <massimodipierr... at gmail.com> wrote:
> 100,000 hits a day is not a low. I get that some day on my web server
> without problem and without one request dropped.
>
> Most frameworks web2py, Django, Pylons can handle that kind of load
> since Python is not the bottle neck.
taking a look at django right now, doesnt look too bad from where im
standing, maybe when i get into the code i'd run into some issues that
would cause some headaches!!

> You have to follow some tricks:
>
> 1) have the web server serve static pages directly and set the pragma
> cache expire to one month
> 2) cache all pages that do not have forms for at least few minutes
> 3) avoid database joins

but this would probably be to the detriment of my database design,
which is a no-no as far as im concerned. The way the tables would be
structured requires 'joins' when querying the db; or could you
elaborate a little??

> 4) use a server with at least 512KB Ram.

hmmm...!, still thinking about what you mean by this statement also.

> 5) if you pages are large, use gzip compression
>
> If you develop your app with the web2py framework, you always have the
> option to deploy on the Google App Engine. If you can live with their
> constraints you should have no scalability problems.
>
> Massimo
>
> On Feb 25, 4:26 am, simn_stv <nany... at googlemail.com> wrote:
>
> > hello people, i have been reading posts on this group for quite some
> > time now and many, if not all (actually not all!), seem quite
> > interesting.
> > i plan to build an application, a network based application that i
> > estimate (and seriously hope) would get as many as 100, 000 hits a day
> > (hehe,...my dad always told me to 'AIM HIGH' ;0), not some 'facebook'
> > or anything like it, its mainly for a financial transactions which
> > gets pretty busy...
> > so my question is this would anyone have anything that would make
> > python a little less of a serious candidate (cos it already is) and
> > the options may be to use some other languages (maybe java, C (oh
> > God))...i am into a bit of php and building API's in php would not be
> > the hard part, what i am concerned about is scalability and
> > efficiency, well, as far as the 'core' is concerned.
>
> > would python be able to manage giving me a solid 'core' and will i be
> > able to use python provide any API i would like to implement?...
>
> > im sorry if my subject was not as clear as probably should be!.
> > i guess this should be the best place to ask this sort of thing, hope
> > im so right.
>
> > Thanks

thanks for the feedback...


From stefan_ml at behnel.de  Mon Mar  1 07:46:22 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Mon, 01 Mar 2010 13:46:22 +0100
Subject: Detecting new removable drives in Linux
In-Reply-To: <2119ee91003010148u4954d495kd53454c27f2b54b2@mail.gmail.com>
References: <2119ee91003010148u4954d495kd53454c27f2b54b2@mail.gmail.com>
Message-ID: <hmgcuu$36f$1@dough.gmane.org>

Bart Smeets, 01.03.2010 10:48:
> I'm trying to write a script which detects when a new removable drive is
> connected to the computer. On #python I was advised to use the
> dbus-bindings. However the documentation on this is limited. Does anyone
> know of an example of how I can detect new removable drives?

You could execute a script from HAL, e.g. using halevt, and let the script
communicate with your program.

http://www.nongnu.org/halevt/

Stefan



From wuwei23 at gmail.com  Mon Mar  1 08:01:49 2010
From: wuwei23 at gmail.com (alex23)
Date: Mon, 1 Mar 2010 05:01:49 -0800 (PST)
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
Message-ID: <759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>

Andreas Waldenburger <use... at geekmail.INVALID> wrote:
> But as I said: a) I am (we are) not in a position to impose this (We
> don't work with the code, we just run the software).

I personally believe that the end users have _every_ right to impose
quality requirements on  code used within their business...although I
may not bring this up in front of them at meetings :)


From usenot at geekmail.INVALID  Mon Mar  1 08:09:43 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Mon, 1 Mar 2010 14:09:43 +0100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
Message-ID: <20100301140943.4edca16b@geekmail.INVALID>

On Mon, 1 Mar 2010 05:01:49 -0800 (PST) alex23 <wuwei23 at gmail.com>
wrote:

> Andreas Waldenburger <use... at geekmail.INVALID> wrote:
> > But as I said: a) I am (we are) not in a position to impose this (We
> > don't work with the code, we just run the software).
> 
> I personally believe that the end users have _every_ right to impose
> quality requirements on  code used within their business...although I
> may not bring this up in front of them at meetings :)

Huh? That's like demanding a certain type of truck or vehicle
maintenance plan from a trucking company. Sure, you *could* do it, but
that effectively only limits your options. I think there should be a
clear separation of concerns here.

/W

-- 
INVALID? DE!



From sayedjewel21 at gmail.com  Mon Mar  1 08:26:31 2010
From: sayedjewel21 at gmail.com (sayed jewel21)
Date: Mon, 1 Mar 2010 05:26:31 -0800 (PST)
Subject: connect with me
Message-ID: <3fc01795-acc4-4e9f-a683-a34293166899@d27g2000yqf.googlegroups.com>

dear guys you can do subscribe with site easily-

http://freelivestreamonlinepctv.blogspot.com/


From vinay_sajip at yahoo.co.uk  Mon Mar  1 08:27:30 2010
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Mon, 1 Mar 2010 05:27:30 -0800 (PST)
Subject: ANN: A new version (0.2.4) of the Python module which wraps GnuPG has
	been released.
Message-ID: <3188c3be-0ba5-48b6-a234-d5e41e034923@t23g2000yqt.googlegroups.com>

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

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

The current version passes all tests on Windows (Python 2.4, 2.5, 2.6,
3.1, Jython 2.5.1) and Ubuntu (Python 2.4, 2.5, 2.6, 3.0, Jython
2.5.1).

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

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

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

Simple usage:

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

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

Cheers

Vinay Sajip
Red Dove Consultants Ltd.


From highcar at gmail.com  Mon Mar  1 08:49:06 2010
From: highcar at gmail.com (elca)
Date: Mon, 1 Mar 2010 05:49:06 -0800 (PST)
Subject: python socket service related question!
Message-ID: <27743609.post@talk.nabble.com>


Hello,All

im totally new to socket programming in python. i was read some tutorial and
manual, but i didn't found what i want to make python related socket script
in manual or tutorial.

i want to make socket script which can send some info to server and also
receive some info from server. For example, i want to send my login
information to server, and want to receive result reply from server.

but i have no idea..how to send my login  information(id and password) to
server.

i was captured with wireshark, some process to send login info to server.

and i was found port number is 5300 and server ip is 58.225.56.152

and i was send id is 'aaaaaaa' and password 'bbbbbbb' and i was received

'USER NOT FOUND' result from server.

how can i make this kind of process with python socket ?

if anyone help me some reference or some example or anything help much
appreciate!

    0000   00 50 56 f2 c8 cc 00 0c 29 a8 f8 c0 08 00 45 00  .PV.....).....E.
    0010   00 e2 2a 19 40 00 80 06 d0 55 c0 a8 cb 85 3a e1  ..*. at ....U....:.
    0020   38 98 05 f3 15 9a b9 86 62 7b 0d ab 0f ba 50 18  8.......b{....P.
    0030   fa f0 26 14 00 00 50 54 3f 09 a2 91 7f 13 00 00  ..&...PT?.......
    0040   00 1f 14 00 02 00 00 00 00 00 00 00 07 00 00 00  ................
    0050   61 61 61 61 61 61 61 50 54 3f 09 a2 91 7f 8b 00  aaaaaaaPT?......
    0060   00 00 1f 15 00 08 00 00 00 07 00 00 00 61 61 61  .............aaa
    0070   61 61 61 61 07 00 00 00 62 62 62 62 62 62 62 01  aaaa....bbbbbbb.
    0080   00 00 00 31 02 00 00 00 4b 52 0f 00 00 00 31 39  ...1....KR....19
    0090   32 2e 31 36 38 2e 32 30 33 2e 31 33 33 30 00 00  2.168.203.1330..
    00a0   00 4d 69 63 72 6f 73 6f 66 74 20 57 69 6e 64 6f  .Microsoft Windo
    00b0   77 73 20 58 50 20 50 72 6f 66 65 73 73 69 6f 6e  ws XP Profession
    00c0   61 6c 20 53 65 72 76 69 63 65 20 50 61 63 6b 20  al Service Pack 
    00d0   32 14 00 00 00 31 30 30 31 33 30 30 35 33 31 35  2....10013005315
    00e0   37 38 33 37 32 30 31 32 33 03 00 00 00 34 37 30  783720123....470
    
    0000   00 0c 29 a8 f8 c0 00 50 56 f2 c8 cc 08 00 45 00  ..)....PV.....E.
    0010   00 28 ae 37 00 00 80 06 8c f1 3a e1 38 98 c0 a8  .(.7......:.8...
    0020   cb 85 15 9a 05 f3 0d ab 0f ba b9 86 63 35 50 10  ............c5P.
    0030   fa f0 5f 8e 00 00 00 00 00 00 00 00              .._.........
    
    0000   00 0c 29 a8 f8 c0 00 50 56 f2 c8 cc 08 00 45 00  ..)....PV.....E.
    0010   00 4c ae 38 00 00 80 06 8c cc 3a e1 38 98 c0 a8  .L.8......:.8...
    0020   cb 85 15 9a 05 f3 0d ab 0f ba b9 86 63 35 50 18  ............c5P.
    0030   fa f0 3e 75 00 00 50 54 3f 09 a2 91 7f 16 00 00  ..>u..PT?.......
    0040   00 1f 18 00 01 00 00 00 0e 00 00 00 55 73 65 72  ............User
    0050   20 4e 6f 74 20 46 6f 75 6e 64                     Not Found


-- 
View this message in context: http://old.nabble.com/python-socket-service-related-question%21-tp27743609p27743609.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From victorsubervi at gmail.com  Mon Mar  1 09:02:56 2010
From: victorsubervi at gmail.com (Victor Subervi)
Date: Mon, 1 Mar 2010 10:02:56 -0400
Subject: Permission Problem
Message-ID: <4dc0cfea1003010602w755b52feu2e7f9dca710ff71@mail.gmail.com>

Hi;
I encountered and solved this problem before with the help of the list, but
it's back, and I've reviewed and done everything I was shown to do last
time, so I'm lost. Here's the script:

#!/usr/bin/python

import cgitb; cgitb.enable()
import cgi
import sys,os
sys.path.append(os.getcwd())
from login import login
import MySQLdb
import re, string
import fpformat

form = cgi.FieldStorage()
width = form.getfirst('width')
lines = '''
#!/usr/bin/python

return %s''' % width
f = 'width.py'
try:
  os.remove(f)
except OSError:
  pass
f = open(f, 'w')
f.writelines(lines)
f.close()

Simple enough. Here's the permissions:

drwxrwxrwx 31 root root   4096 Feb 23 04:57 ..
-rwxrwxrwx  1 root root    390 Mar  1 05:52 preload.py

All loaded up deliberately to try and get it to work. Here's the error:

 /var/www/html/globalsolutionsgroup.vi/preload.py
   21 except OSError:
   22   pass
   23 f = open(f, 'w')
   24 f.writelines(lines)
   25 f.close()
f = 'width.py', builtin open = <type 'file'>
IOError: [Errno 13] Permission denied: 'width.py'
      args = (13, 'Permission denied')
      errno = 13
      filename = 'width.py'
      strerror = 'Permission denied'

What'd I do wrong?
TIA,
beno

-- 
The Logos has come to bear
http://logos.13gems.com/
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From urbangabo at gmail.com  Mon Mar  1 09:05:03 2010
From: urbangabo at gmail.com (Gabor Urban)
Date: Mon, 1 Mar 2010 15:05:03 +0100
Subject: Class attributes / methods lost?
Message-ID: <f7ac28aa1003010605t38d72d42n4af5008878a1c921@mail.gmail.com>

Hi guys,

I am building a nested data structure with the following compontens:

<>

class Item:
    def __init__(self, pId, pChange, pComment):
        self.ID = pId
        self.Delta = pChange
        self.Comment = pComment

    def PrintItem(self):
        str = '%s,%s,%s'%(self.ID,self.Delta,self.comment)
        return str

class Package:
    def __init__(self, pSerial, pDate, pOwner, pSchema):
        self.serial = pSerial
        self.date = pDate
        self.owner = pOwner
        self.schema = pSchema
        self.items = []

    def insertItem(self, pItem):
        self.items.append(pItem)

    def printPackage(self):
        lines = []
        str = '%s,%s,%s,%s'%(self.serial,self.date,self.owner,self.schema)
        number = self.items.length
        for idx in xrange(number):
            line = ''
            istr = self.items[idx].PrintItem()
            line = str + ',' + istr
            lines.append(line)
        return lines

<>

The above structure is processed with next code:

<>

size = len(packages)
package = None
for index in xrange(size):
    logger.info('PrettyPrinting package id=%d',index)
    oplines = []
    oplines = packages[index].printPackage()
    for i in xrange(oplines.length):
        data.append(oplines[i])
<>

I've got the next error message:
' Traceback (most recent call last):
  File "XmlHistory_orig.py", line 203, in ?
    oplines = packages[index].printPackage()
TypeError: unbound method printPackage() must be called with Package
instance as first argument (got nothing instead) '

I did give a try to access the fields directly

<>
packages = []
data = []

size = len(packages)
for index in xrange(size):
    str = '%s,%s,%s,%s'%(packages[index].serial,packages[index].date,packages[index].owner,packages[index].schema)
    itemnum = len(packages[index].items)
    oplines = []
    for itemIndx in xrange(itemnum):
        element =
'%s,%s,%s'%(packages[index].items[itemIdx].ID,packages[index].items[itemIdx].Delta,packages[index].items[itemIdx].comment)
        oplines.append(str + ','+elemt)

<>

Error:

Traceback (most recent call last):
  File "XmlHistory.py", line 204, in ?
    str = '%s,%s,%s,%s'%(packages[index].serial,packages[index].date,packages[index].owner,packages[index].schema)
AttributeError: class Package has no attribute 'serial'

The strange in this issue for me, that I do not see why are the class
methods and fields lost.

Any idea is wellcome.

Gabor
-- 
Linux: Choice of a GNU Generation


From __peter__ at web.de  Mon Mar  1 09:24:37 2010
From: __peter__ at web.de (Peter Otten)
Date: Mon, 01 Mar 2010 15:24:37 +0100
Subject: Class attributes / methods lost?
References: <mailman.51.1267452306.23598.python-list@python.org>
Message-ID: <hmgimc$59u$00$1@news.t-online.com>

Gabor Urban wrote:

> I am building a nested data structure with the following compontens:

<snip>

> Any idea is wellcome.

The error messages suggest that you are using classes where you should be 
using class instances, but you don't provide the code where this problem 
originates.

The code you do give looks like a very literal and incomplete conversion 
from Java. Rather than go into the details I suggest that you have a look at 
the Tutorial (and PEP 8) before you proceed.

http://docs.python.org/tutorial/index.html
http://www.python.org/dev/peps/pep-0008/

Peter




From nanyaks at googlemail.com  Mon Mar  1 09:42:28 2010
From: nanyaks at googlemail.com (simn_stv)
Date: Mon, 1 Mar 2010 06:42:28 -0800 (PST)
Subject: taking python enterprise level?...
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<mailman.233.1267106234.4577.python-list@python.org>
	<hm650q$esk$1@news.eternal-september.org> 
	<mailman.244.1267114628.4577.python-list@python.org>
	<7uohugFedhU1@mid.uni-berlin.de> 
	<mailman.257.1267156817.4577.python-list@python.org>
	<7upi0jFuapU2@mid.uni-berlin.de>
Message-ID: <7f8b1651-69fc-4ae1-8f55-840ff9f9d1dc@15g2000yqa.googlegroups.com>

On Feb 26, 10:19 am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> Am 26.02.10 05:01, schrieb D'Arcy J.M. Cain:
>
>
>
> > On Fri, 26 Feb 2010 01:12:00 +0100
> > "Diez B. Roggisch"<de... at nospam.web.de>  wrote:
> >>> That better way turned out to asynchronous update transactions.  All we
> >>> did was keep feeding updates to the remote site and forget about ACKS.
> >>> We then had a second process which handled ACKS and tracked which
> >>> packets had been properly transferred.  The system had IDs on each
> >>> update and retries happened if ACKS didn't happen soon enough.
> >>> Naturally we ignored ACKS that we had already processed.
>
> >> sounds like using UDP to me, of course with a protocol on top (namely
> >> the one you implemented).
>
> >> Any reason you sticked to TCP instead?
>
> > TCP does a great job of delivering a stream of data in order and
> > handling the retries.  The app really was connection oriented and we
> > saw no reason to emulate that over an unconnected protocol.  There were
> > other wheels to reinvent that were more important.
>
> So when you talk about ACKs, you don't mean these on the TCP-level
> (darn, whatever iso-level that is...), but on some higher level?
>
> Diez

i think its on the TCP that he's referring to or is it?...
if it is, that means he's doing some 'mean' network level scripting,
impressive...but i never thought python could go that deep in network
programming!...


From darcy at druid.net  Mon Mar  1 09:43:13 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Mon, 1 Mar 2010 09:43:13 -0500
Subject: taking python enterprise level?...
In-Reply-To: <e64e9273-6d28-4a94-b337-ce5e019e4ea6@z35g2000yqd.googlegroups.com>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<mailman.233.1267106234.4577.python-list@python.org>
	<hm650q$esk$1@news.eternal-september.org>
	<mailman.244.1267114628.4577.python-list@python.org>
	<e64e9273-6d28-4a94-b337-ce5e019e4ea6@z35g2000yqd.googlegroups.com>
Message-ID: <20100301094313.e04eab06.darcy@druid.net>

On Mon, 1 Mar 2010 04:11:07 -0800 (PST)
simn_stv <nanyaks at googlemail.com> wrote:
> > All of the above (and much more complexity not even discussed here) was
> > handled by Python code and database manipulation.  There were a few
> > bumps along the way but overall it worked fine.  If we were using C or
> > even assembler we would not have sped up anything and the solution we
> > came up with would have been horrendous to code.  As it was I and my
> > chief programmer locked ourselves in the boardroom and had a working
> > solution before the day was out.
> 
> sure it wouldnt have sped it up a bit, even a bit?; probably the
> development and maintenance time would be a nightmare but it should
> speed the app up a bit...

What do you mean by "even a bit?"  The bulk of the time is in sending
bits on the wire.  Computer time was always negligible in this
situation.  Yes, I can write all of my applications in assembler to get
a 0.00000000000001% increase in speed but who cares?

If you have decent algorithms in place then 99% of the time I/O will be
your bottleneck and if it isn't then you have a compute heavy problem
that assembler isn't going to fix.

And even if I get a 100% increase in speed, I still lose.  Computer
time is cheaper than programmer time by so many orders of magnitude
that it isn't even worh factoring in the speedup.

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


From darcy at druid.net  Mon Mar  1 10:02:15 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Mon, 1 Mar 2010 10:02:15 -0500
Subject: taking python enterprise level?...
In-Reply-To: <7f8b1651-69fc-4ae1-8f55-840ff9f9d1dc@15g2000yqa.googlegroups.com>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<mailman.233.1267106234.4577.python-list@python.org>
	<hm650q$esk$1@news.eternal-september.org>
	<mailman.244.1267114628.4577.python-list@python.org>
	<7uohugFedhU1@mid.uni-berlin.de>
	<mailman.257.1267156817.4577.python-list@python.org>
	<7upi0jFuapU2@mid.uni-berlin.de>
	<7f8b1651-69fc-4ae1-8f55-840ff9f9d1dc@15g2000yqa.googlegroups.com>
Message-ID: <20100301100215.a9387aa4.darcy@druid.net>

On Mon, 1 Mar 2010 06:42:28 -0800 (PST)
simn_stv <nanyaks at googlemail.com> wrote:
> On Feb 26, 10:19 am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> > So when you talk about ACKs, you don't mean these on the TCP-level
> > (darn, whatever iso-level that is...), but on some higher level?
> 
> i think its on the TCP that he's referring to or is it?...

No, I mean in our own application layer.

> if it is, that means he's doing some 'mean' network level scripting,
> impressive...but i never thought python could go that deep in network
> programming!...

What I meant was that we just keep sending packets which TCP/IP keeps
in order for us by reassembling out-of-order and retransmitted
packets.  Asynchronously we sent back to our own application an ACK
that our app level packet was finally received.  It's a sliding window
protocol.  http://en.wikipedia.org/wiki/Sliding_Window_Protocol

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


From victorsubervi at gmail.com  Mon Mar  1 10:07:52 2010
From: victorsubervi at gmail.com (Victor Subervi)
Date: Mon, 1 Mar 2010 11:07:52 -0400
Subject: Permission Problem
In-Reply-To: <4dc0cfea1003010602w755b52feu2e7f9dca710ff71@mail.gmail.com>
References: <4dc0cfea1003010602w755b52feu2e7f9dca710ff71@mail.gmail.com>
Message-ID: <4dc0cfea1003010707j872922ckd30d62173e831c6e@mail.gmail.com>

Never mind. I figured out my error.
beno

On Mon, Mar 1, 2010 at 10:02 AM, Victor Subervi <victorsubervi at gmail.com>wrote:

> Hi;
> I encountered and solved this problem before with the help of the list, but
> it's back, and I've reviewed and done everything I was shown to do last
> time, so I'm lost. Here's the script:
>
> #!/usr/bin/python
>
> import cgitb; cgitb.enable()
> import cgi
> import sys,os
> sys.path.append(os.getcwd())
> from login import login
> import MySQLdb
> import re, string
> import fpformat
>
> form = cgi.FieldStorage()
> width = form.getfirst('width')
> lines = '''
> #!/usr/bin/python
>
> return %s''' % width
> f = 'width.py'
> try:
>   os.remove(f)
> except OSError:
>   pass
> f = open(f, 'w')
> f.writelines(lines)
> f.close()
>
> Simple enough. Here's the permissions:
>
> drwxrwxrwx 31 root root   4096 Feb 23 04:57 ..
> -rwxrwxrwx  1 root root    390 Mar  1 05:52 preload.py
>
> All loaded up deliberately to try and get it to work. Here's the error:
>
>  /var/www/html/globalsolutionsgroup.vi/preload.py
>    21 except OSError:
>    22   pass
>    23 f = open(f, 'w')
>    24 f.writelines(lines)
>    25 f.close()
> f = 'width.py', builtin open = <type 'file'>
> IOError: [Errno 13] Permission denied: 'width.py'
>       args = (13, 'Permission denied')
>       errno = 13
>       filename = 'width.py'
>       strerror = 'Permission denied'
>
> What'd I do wrong?
> TIA,
> beno
>
> --
> The Logos has come to bear
> http://logos.13gems.com/
>



-- 
The Logos has come to bear
http://logos.13gems.com/
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From jeanmichel at sequans.com  Mon Mar  1 10:09:22 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 01 Mar 2010 16:09:22 +0100
Subject: Class attributes / methods lost?
In-Reply-To: <f7ac28aa1003010605t38d72d42n4af5008878a1c921@mail.gmail.com>
References: <f7ac28aa1003010605t38d72d42n4af5008878a1c921@mail.gmail.com>
Message-ID: <4B8BD8A2.40800@sequans.com>

Gabor Urban wrote:
> Hi guys,
>
> I am building a nested data structure with the following compontens:
>
> <>
>
> class Item:
>     def __init__(self, pId, pChange, pComment):
>         self.ID = pId
>         self.Delta = pChange
>         self.Comment = pComment
>
>     def PrintItem(self):
>         str = '%s,%s,%s'%(self.ID,self.Delta,self.comment)
>         return str
>
> class Package:
>     def __init__(self, pSerial, pDate, pOwner, pSchema):
>         self.serial = pSerial
>         self.date = pDate
>         self.owner = pOwner
>         self.schema = pSchema
>         self.items = []
>
>     def insertItem(self, pItem):
>         self.items.append(pItem)
>
>     def printPackage(self):
>         lines = []
>         str = '%s,%s,%s,%s'%(self.serial,self.date,self.owner,self.schema)
>         number = self.items.length
>         for idx in xrange(number):
>             line = ''
>             istr = self.items[idx].PrintItem()
>             line = str + ',' + istr
>             lines.append(line)
>         return lines
>
> <>
>
> The above structure is processed with next code:
>
> <>
>
> size = len(packages)
> package = None
> for index in xrange(size):
>     logger.info('PrettyPrinting package id=%d',index)
>     oplines = []
>     oplines = packages[index].printPackage()
>     for i in xrange(oplines.length):
>         data.append(oplines[i])
> <>
>
> I've got the next error message:
> ' Traceback (most recent call last):
>   File "XmlHistory_orig.py", line 203, in ?
>     oplines = packages[index].printPackage()
> TypeError: unbound method printPackage() must be called with Package
> instance as first argument (got nothing instead) '
>
> I did give a try to access the fields directly
>
> <>
> packages = []
> data = []
>
> size = len(packages)
> for index in xrange(size):
>     str = '%s,%s,%s,%s'%(packages[index].serial,packages[index].date,packages[index].owner,packages[index].schema)
>     itemnum = len(packages[index].items)
>     oplines = []
>     for itemIndx in xrange(itemnum):
>         element =
> '%s,%s,%s'%(packages[index].items[itemIdx].ID,packages[index].items[itemIdx].Delta,packages[index].items[itemIdx].comment)
>         oplines.append(str + ','+elemt)
>
> <>
>
> Error:
>
> Traceback (most recent call last):
>   File "XmlHistory.py", line 204, in ?
>     str = '%s,%s,%s,%s'%(packages[index].serial,packages[index].date,packages[index].owner,packages[index].schema)
> AttributeError: class Package has no attribute 'serial'
>
> The strange in this issue for me, that I do not see why are the class
> methods and fields lost.
>
> Any idea is wellcome.
>
> Gabor
>   
Ok here are some suggestions :

1/ do not name a method PrintItem if the method does not print anything 
(it does not)
2/ use the __str__ method to return a nice representation of your objects
3/ use pythonic iteration controls
4/ be consistant with your naming convention, your Item's attributes 
start with an Uppercase letter, Package's attributes with a lowercase 
one. (I suggest the lowercase)


class Item(object):
    def __init__(self, pId, pChange, pComment):
        self.id = pId
        self.delta = pChange
        self.comment = pComment

    def __str__(self):
        return self.__class__.__name__ + ':' + str(self.__dict__)

class Package(object):
    def __init__(self, pSerial, pDate, pOwner, pSchema):
        self.serial = pSerial
        self.date = pDate
        self.owner = pOwner
        self.schema = pSchema
        self.items = []

    def insertItem(self, pItem):
        self.items.append(pItem)

    def __str__(self):
        _dict = self.__dict__.copy()
        _dict['items'] = [str(item) for item in self.items]
        return self.__class__.__name__ + ':' + str(_dict)

i1 = Item('a', 'b', 'c')
i2 = Item('foo', 'bar', 'baz')
p = Package(1,2,3,4)
p.insertItem(i1)
p.insertItem(i2)
packages = [p]

for package in packages:
    print package

 >>> Package:{'date': 2, 'owner': 3, 'serial': 1, 'schema': 4, 'items': 
["Item:{'comment': 'c', 'id': 'a', 'delta': 'b'}", "Item:{'comment': 
'baz', 'id': 'foo', 'delta': 'bar'}"]}

Regarding the error you get, it seems you've stored the class itself, 
instead instances.
The error should be in the way you've built the package list, but you 
did not provide the code.

JM



From python at mrabarnett.plus.com  Mon Mar  1 10:17:14 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Mon, 01 Mar 2010 15:17:14 +0000
Subject: Docstrings considered too complicated
In-Reply-To: <4B8B9845.70604@sequans.com>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>
	<4B89D8BE.2040905@mrabarnett.plus.com> <4B8B9845.70604@sequans.com>
Message-ID: <4B8BDA7A.3060600@mrabarnett.plus.com>

Jean-Michel Pichavant wrote:
> MRAB wrote:
>> Gregory Ewing wrote:
>>> Mel wrote:
>>>
>>>> You could think of it as a not bad use of the design principle 
>>>> "Clear The Simple Stuff Out Of The Way First".  Destinations are 
>>>> commonly a lot simpler than sources
>>>
>>> That's not usually true in assembly languages, though,
>>> where the source and destination are both very restricted
>>> and often about the same complexity.
>>>
>>> That's not to say that right-to-left is the wrong way
>>> to do it in an assembly language, but there are less
>>> misleading words than "move" that could be used.
>>>
>>> Z80 assembly language uses "load", which makes things
>>> considerably clearer:
>>>
>>>   LD A, B  ; load A with B
>>>
>> Some processors distinguish between "load" (memory to register) and
>> "store" (register to memory), and the destination and LHS operand of
>> binary operations might be the same register, for example:
>>
>>     CLC ; clear the carry
>>     LDA first ; accumulator := byte at first
>>     ADCA second ; accumulator := accumulator + byte at second + carry
>>     STA result ; byte at third := accumulator
>>
> Guys, you sound like people arguing about old school TV show / series 
> like star treck :-)
> - "He was wearing a blue suit !"
> - "Check episode number 29, he appeared with a pink one!"
> 
> I'm glad I'm too young to had to code in assembler, or to bear the 
> vision of those unlikely space suits from the 70's ;-)
> 
Ah, yes, Star Trek (the original series).

If they transported down to a planet and there was a man in a red shirt
who you'd never seen before, he'd be the one to die! :-)

BTW, the first programming I did was in hexadecimal (C4xx was "LDI xx").


From greg.lindstrom at novasyshealth.com  Mon Mar  1 10:19:57 2010
From: greg.lindstrom at novasyshealth.com (Greg Lindstrom)
Date: Mon, 01 Mar 2010 09:19:57 -0600
Subject: Looking for an Application
Message-ID: <4B8BDB1D.2050309@novasyshealth.com>

A few months ago there was a post dealing with an application that would 
power scripts based on graphical snippets of the screen.  Essentially, 
the script would "look" for a match with what you pasted into it.  I 
don't recall the name of the application, but would like to try it.  
Does anyone remember what it is?

Thanks,
--greg




From arjun.chennu at gmail.com  Mon Mar  1 10:35:38 2010
From: arjun.chennu at gmail.com (Arjun Chennu)
Date: Mon, 1 Mar 2010 16:35:38 +0100
Subject: How to end TCP socket data while using readline()?
In-Reply-To: <20100227041115.GA24869@cskk.homeip.net>
References: <273a2d1e-cff5-4759-a59d-6ccfefddfa40@e1g2000yqh.googlegroups.com>
	<20100227041115.GA24869@cskk.homeip.net>
Message-ID: <db4a45821003010735h361cd25s5624ca817a98835e@mail.gmail.com>

Thanks for the feedback.

Opening a separate file-obj for writing and for reading is just what I've
been trying, but I don't seem to get it to work. I'm new to python and I'm
not sure if I'm missing the intricacy of some command. Please help:

Here is my server snippet:

            (conn, addr) = sock1.accept()    # connected socket
            print 'Client (localhost) port: ', addr[1]

            cf = conn.makefile('r',0)    # file obj for reading
            lf = open('ccs.txt','w')

            for linenum, line in enumerate(cf):    # iterate over socket
lines
                lf.write(line)
                #sys.stdout.write(line)
                print len(line)

            cf.close()

            stat = 'wrote %s lines to file.\n' %(linenum+1)
            cff = conn.makefile('w',0)   # file obj for writing
            cff.writelines(stat)      # cff.write(stat) does not work
either!!
            cff.close()

            lf.close()
            conn.close()
            print stat, "DONE!"

And here is the client that I have for it:  (sfp is the local file object i
read from)

        for line in sfp.readlines():
            cf.write(line)
            print len(line)

        print 'done sending'
        cf.close()   #writing ends here

        cff = s.makefile('r',0)   # file obj for writing
        for line in cff.readlines():
            print line

        cff.close()

        sfp.close()
        s.close()

The execution sends all the lines (and prints out the len(line) ) and then
stays waiting. THen when I manually terminate the client script, the server
script happily types the "DONE!" output.

Where is this protocol hanging up? Help much appreciated, with a small
explanation.

Cheers,
Arjun

On Sat, Feb 27, 2010 at 05:11, Cameron Simpson <cs at zip.com.au> wrote:

> On 26Feb2010 10:39, Arjun <arjun.chennu at gmail.com> wrote:
> | Hi, I have a small script that runs a TCP server. A client connects to
> | this server and transmits a stored file line-by-line, and then waits
> | for a confirmation "done". However, when I run them the first loop
> | never really ends -- as the TCP server keeps expecting more data. I am
> | using a file-like-object, and so somehow I have to communicate to the
> | server that it is the end-of-file.
> |
> | here is some server code
> | <snip>
> |             sock1.bind(('', port))
> |             print "Listening at port: ", port
> |             sock1.listen(1)      # listening socket
> |             (conn, addr) = sock1.accept()    # connected socket
> |             print 'Client (localhost) port: ', addr[1]
> |
> |             cf = conn.makefile('r',0)    # file like obj for socket
> [...]
> |         print 'close'
> |         cf.flush()
> |         cf.close()
> |         sfp.close()
> [...]
>
> Too many files. It's not that hard! Or shouldn't be.
>
> | So what I am wondering is:
> |
> | 1. Using a file-like object means that the socket becomes uni-
> | directional, until the mode of the file object is changed from 'r' to
> | 'w' (or vice versa). This seems inefficient, and rather unPythonesque.
> | Can somebody tell me if there is a more elegant way of receiving all
> | the lines from the client, and then sending a "done" message to the
> | client?
>
> Get the socket. It is a file descriptor (or in may be a python "socket"
> object with a file descriptor inside).
>
> Open _two_ "file" objects on it using
>  from_file = os.fdopen(fd_of_socket, "r")
>  to_file = os.fdopen(fd_of_socket, "w").
>
> Use the same:
>  print >>to_file, 'close'
>  to_file.flush()
> method as you're using already.
> Read from to_file as needed.
>
> The same scheme should work in both server and client:
>
> Don't look for EOF, watch the input line flow.
>
> You might need to use readline() instead of the file-by-line iteration
> stuff,
> which I seem to recall has some sort of problem handing out the "latest"
> line.
>
> Cheers,
> --
> Cameron Simpson <cs at zip.com.au> DoD#743
> http://www.cskk.ezoshosting.com/cs/
>
> It's better, when you're riding with someone you don't know so well, to
> stick
> to the inside line - it's easier to avoid the bits...
>        - Barry Sheene
>
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From arjun.chennu at gmail.com  Mon Mar  1 10:53:10 2010
From: arjun.chennu at gmail.com (Arjun Chennu)
Date: Mon, 1 Mar 2010 16:53:10 +0100
Subject: How to end TCP socket data while using readline()?
In-Reply-To: <db4a45821003010735h361cd25s5624ca817a98835e@mail.gmail.com>
References: <273a2d1e-cff5-4759-a59d-6ccfefddfa40@e1g2000yqh.googlegroups.com>
	<20100227041115.GA24869@cskk.homeip.net>
	<db4a45821003010735h361cd25s5624ca817a98835e@mail.gmail.com>
Message-ID: <db4a45821003010753yfa269cfwaae8915c60003055@mail.gmail.com>

It DOES seem like only when the connection socket is closed via conn.close()
that the data is flushed and the 'waiting' ends. So with the earlier
suggestion that I open one file-obj for reading and one for writing, I still
cannot acheive two-way communication because I need to close the connection
for it to actually occur completely!

My client waits after the "done sending" line indefinitely. Weird.

A

On Mon, Mar 1, 2010 at 16:35, Arjun Chennu <arjun.chennu at gmail.com> wrote:

> Thanks for the feedback.
>
> Opening a separate file-obj for writing and for reading is just what I've
> been trying, but I don't seem to get it to work. I'm new to python and I'm
> not sure if I'm missing the intricacy of some command. Please help:
>
> Here is my server snippet:
>
>
>             (conn, addr) = sock1.accept()    # connected socket
>             print 'Client (localhost) port: ', addr[1]
>
>             cf = conn.makefile('r',0)    # file obj for reading
>
>             lf = open('ccs.txt','w')
>
>             for linenum, line in enumerate(cf):    # iterate over socket
> lines
>                 lf.write(line)
>                 #sys.stdout.write(line)
>                 print len(line)
>
>             cf.close()
>
>             stat = 'wrote %s lines to file.\n' %(linenum+1)
>             cff = conn.makefile('w',0)   # file obj for writing
>             cff.writelines(stat)      # cff.write(stat) does not work
> either!!
>             cff.close()
>
>             lf.close()
>             conn.close()
>             print stat, "DONE!"
>
> And here is the client that I have for it:  (sfp is the local file object i
> read from)
>
>
>         for line in sfp.readlines():
>             cf.write(line)
>             print len(line)
>
>         print 'done sending'
>         cf.close()   #writing ends here
>
>         cff = s.makefile('r',0)   # file obj for writing
>         for line in cff.readlines():
>             print line
>
>         cff.close()
>
>         sfp.close()
>         s.close()
>
> The execution sends all the lines (and prints out the len(line) ) and then
> stays waiting. THen when I manually terminate the client script, the server
> script happily types the "DONE!" output.
>
> Where is this protocol hanging up? Help much appreciated, with a small
> explanation.
>
> Cheers,
> Arjun
>
>
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From pmaupin at gmail.com  Mon Mar  1 11:08:35 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 08:08:35 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
Message-ID: <bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>

On Feb 28, 9:18?pm, Steven D'Aprano > Wait a minute... if JSON is too
hard to edit, and RSON is a *superset* of
> JSON, that means by definition every JSON file is also a valid RSON file.
> Since JSON is too hard to manually edit, so is RSON.

Well, Python is essentially a superset of JSON, with string escape
handling being ever so slightly different, and using True instead of
true, False instead of false, and None instead of null.  YMMV, but I
find it possible, even probable, to write Python that is far easier to
edit than JSON, and in fact, I have used Python for configuration
files that are only to be edited by programmers or other technical
types.

> Come back when you actually have MANY users other than yourself using
> this is real-world projects. Until then, it is too early to even consider
> adding it the std library. Python comes with batteries included, but not
> experimental batteries that aren't even built yet, let alone proven that
> they work.

I know that it is too early to be included in the library.  But there
is a chicken-and-egg problem.  PEP 1 says you should circulate a
design for discussion before writing code...

I fully expect this sort of negative feedback, fully expect that it
will be years (if ever) before the code makes it into the standard
library, and yet I offer the design for your perusal, just on the slim
chance that I might get a few constructive criticisms on the actual
design to go along with all the silly strawmen reductio ad absurdum
arguments by people who aren't even going to bother to read the thing.

Best regards,
Pat


From qtrimble at gmail.com  Mon Mar  1 11:15:19 2010
From: qtrimble at gmail.com (qtrimble)
Date: Mon, 1 Mar 2010 08:15:19 -0800 (PST)
Subject: loop through each line in a text file
References: <3484373a-2045-428e-9040-abdfecd95e25@f35g2000yqd.googlegroups.com>
	<07a7edd4-9e72-4425-865b-f475c2050ea7@z11g2000yqz.googlegroups.com> 
	<22084c82-0f69-46b0-883f-ef1d3c47d792@o3g2000yqb.googlegroups.com> 
	<121bb934-6d62-482a-a5c2-848668ce237d@q16g2000yqq.googlegroups.com>
Message-ID: <e768164e-aecc-4599-99b1-82dabd45ed1d@t20g2000yqe.googlegroups.com>

On Feb 26, 6:19?pm, ru... at yahoo.com wrote:
> On Feb 26, 2:21?pm, qtrimble <qtrim... at gmail.com> wrote:
>
>
>
> > On Feb 26, 4:14?pm, OdarR <olivier.da... at gmail.com> wrote:
> > <snip>
> > > > below is just a sample. ?There are well over 500,000 lines that need
> > > > processed.
>
> > > > wer1999001
> > > > ? ? ? 31.2234 ? ? ?82.2367
> > > > ? ? ? 37.9535 ? ? ?82.3456
> > > > wer1999002
> > > > ? ? ? 31.2234 ? ? ?82.2367
> > > > ? ? ? 37.9535 ? ? ?82.3456
>
> > > did you try something as a working basis ?
>
> > > Olivier
>
> > Yes but it's very simple -
>
> > fileIN = open(r"C:\testing.txt", "r")
>
> > for line in fileIN:
> > ? ? year = line[3:7]
> > ? ? day = line[7:10]
> > ? ? print year, day
>
> > This is good since i can get the year and day of year into a variable
> > but I haven't gotten any further.
>
> How about something like (untested):
>
> ? for line in fileIN:
> ? ? ? ?if line.startswith ("wer"):
> ? ? ? ? ? ?year = line[3:7]
> ? ? ? ? ? ?day = line[7:10]
> ? ? ? ? else:
> ? ? ? ? ? ?print "%s-%s %s" % (year, day, line.strip())
>
> You can adjust the details as needed...

Thanks to all of you for your suggestions.

This is what I have now.  It may not be the most efficient or well
written script but it works!  Thanks again!

fileIN = open(r"C:\z_paul\ims1999.txt", "r")

for line in fileIN:
    if line.startswith("ims"):
        year = line[3:7]
        day = line[7:10]
        newfile = file(r"C:\z_paul\output\ims" + year + day + ".txt",
"wt")
        newfile.write("YEAR,DOY,Y_COORD,X_COORD,TYPE\n")
    else:
        temp = line.replace('      ',',')
        temp2 = temp.replace(', ',',')
        newfile.write(year + "," + day + temp2)
newfile.close()


From lie.1296 at gmail.com  Mon Mar  1 11:18:30 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Tue, 02 Mar 2010 03:18:30 +1100
Subject: Docstrings considered too complicated
In-Reply-To: <20100301140943.4edca16b@geekmail.INVALID>
References: <20100224212303.242222c6@geekmail.INVALID>	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>	<20100227191040.6c77f2d8@geekmail.INVALID>	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
Message-ID: <4b8be8f7$1@dnews.tpgi.com.au>

On 03/02/10 00:09, Andreas Waldenburger wrote:
> On Mon, 1 Mar 2010 05:01:49 -0800 (PST) alex23 <wuwei23 at gmail.com>
> wrote:
> 
>> Andreas Waldenburger <use... at geekmail.INVALID> wrote:
>>> But as I said: a) I am (we are) not in a position to impose this (We
>>> don't work with the code, we just run the software).
>>
>> I personally believe that the end users have _every_ right to impose
>> quality requirements on  code used within their business...although I
>> may not bring this up in front of them at meetings :)
> 
> Huh? That's like demanding a certain type of truck or vehicle
> maintenance plan from a trucking company. Sure, you *could* do it, but
> that effectively only limits your options. I think there should be a
> clear separation of concerns here.

If my truck contains food items that spoils quickly, I would want to
make sure that the trucking company takes good care of their
refrigeration system and that the truck have as little chance as
possible for breakdown due to poor maintenance.


From tibor.beck at hotmail.com  Mon Mar  1 11:22:27 2010
From: tibor.beck at hotmail.com (gentlestone)
Date: Mon, 1 Mar 2010 08:22:27 -0800 (PST)
Subject: AOP decorator?
Message-ID: <9437135d-e2f7-4317-a5bd-46346fa5b5fb@q21g2000yqm.googlegroups.com>

Hi,

suppose my source code looks like:
--------------------------------
  import aspect_xy
  class Basic(object, aspect_xy.Basic):
    pass # basic attributes and methods ...
--------------------------------
and the source code of aspect_xy.py is:
--------------------------------
  class Basic(object):
    pass  # aspect extra attributes and methods ...
--------------------------------
how can I write this with decorators? I want something like:
-------------------------------
  import aspect_xy
  @aspect_xy # extra attributes and methods ...
  class Basic(object):
    pass # basic attributes and methods ...
----------------------------------------------------------
I want to write class decorator function, which:
1. Takes the basic class as parameter
2. Find the same class name in aspect_xy.py
3. Inherit the found aspect class
Is it possible?








From pmaupin at gmail.com  Mon Mar  1 11:27:34 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 08:27:34 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<4b8b5cef$0$1625$742ec2ed@news.sonic.net>
Message-ID: <445e1928-b312-4082-8987-494ad2641e5d@y17g2000yqd.googlegroups.com>

On Mar 1, 12:39?am, John Nagle <na... at animats.com> wrote:
> Patrick Maupin wrote:
> > All:
>
> > Finding .ini configuration files too limiting, JSON and XML to hard to
> > manually edit, and YAML too complex to parse quickly, I have started
> > work on a new configuration file parser.
>
> ? ? You're not supposed to edit those formats manually.
>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? John Nagle

Opinions on that will vary, and as the saying goes, "everybody is
entitled to his own opinions, but not his own facts."

I submit as fact that there are many initialization files in each of
these formats, and I would be willing to place a wager that the
majority of the people on this list have used a text editor to modify
at least one file in this category at least once.

IOW, in my opinion (and it is only an opinion, not a fact), you are
actually helping to make the case that a better format is needed.

Regards,
Pat


From anand.shashwat at gmail.com  Mon Mar  1 11:59:52 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Mon, 1 Mar 2010 22:29:52 +0530
Subject: Looking for an Application
In-Reply-To: <4B8BDB1D.2050309@novasyshealth.com>
References: <4B8BDB1D.2050309@novasyshealth.com>
Message-ID: <d4ab53de1003010859xf2be6aeu6246c12d776bfec5@mail.gmail.com>

project sikuli : http://groups.csail.mit.edu/uid/sikuli/

On Mon, Mar 1, 2010 at 8:49 PM, Greg Lindstrom <
greg.lindstrom at novasyshealth.com> wrote:

> A few months ago there was a post dealing with an application that would
> power scripts based on graphical snippets of the screen.  Essentially, the
> script would "look" for a match with what you pasted into it.  I don't
> recall the name of the application, but would like to try it.  Does anyone
> remember what it is?
>
> Thanks,
> --greg
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From noamraph at gmail.com  Mon Mar  1 12:07:15 2010
From: noamraph at gmail.com (Noam Yorav-Raphael)
Date: Mon, 1 Mar 2010 09:07:15 -0800 (PST)
Subject: DreamPie - The Python shell you've always dreamed about!
References: <6c6a96e0-be08-4ec3-a002-0bb9232a8afd@f29g2000yqa.googlegroups.com>
	<1053124a-8ceb-4804-a7e5-9433acd3f02d@f17g2000prh.googlegroups.com> 
	<mailman.104.1266926192.4577.python-list@python.org>
Message-ID: <edf3d45b-314c-4848-b3a5-1ff91bb076f1@f8g2000yqn.googlegroups.com>

This is most probably a bug discovered in DreamPie 1.0 (See
https://bugs.launchpad.net/dreampie/+bug/525652 )

Can you try to download DreamPie 1.0.1, and if it still happens,
report a bug?

Thanks!
Noam


From noamraph at gmail.com  Mon Mar  1 12:08:28 2010
From: noamraph at gmail.com (Noam Yorav-Raphael)
Date: Mon, 1 Mar 2010 09:08:28 -0800 (PST)
Subject: DreamPie - The Python shell you've always dreamed about!
References: <6c6a96e0-be08-4ec3-a002-0bb9232a8afd@f29g2000yqa.googlegroups.com>
	<7f014ea61002210913p237adec3le0618bc899bd3f9a@mail.gmail.com> 
	<b348a0851002230411s6562c338i2e8529ca6b74e4a2@mail.gmail.com> 
	<mailman.108.1266931509.4577.python-list@python.org>
Message-ID: <f7405dcb-f6e1-4f43-a7e7-761da543658d@c16g2000yqd.googlegroups.com>

Can you try DreamPie 1.0.1 and say if it still happens?

There's a bug report system at launchpad.net/dreampie.

Thanks,
Noam


From robert.kern at gmail.com  Mon Mar  1 12:13:37 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Mon, 01 Mar 2010 11:13:37 -0600
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
Message-ID: <hmgskj$3h3$1@dough.gmane.org>

On 2010-03-01 10:08 , Patrick Maupin wrote:
> On Feb 28, 9:18 pm, Steven D'Aprano

>> Come back when you actually have MANY users other than yourself using
>> this is real-world projects. Until then, it is too early to even consider
>> adding it the std library. Python comes with batteries included, but not
>> experimental batteries that aren't even built yet, let alone proven that
>> they work.
>
> I know that it is too early to be included in the library.  But there
> is a chicken-and-egg problem.  PEP 1 says you should circulate a
> design for discussion before writing code...

Ignore it. That comment really doesn't apply to this case. That's for things 
that only make sense in the language or standard library, like context managers. 
For libraries like this, Steven's summary is correct. It needs to have a useful 
life as a third party package for a few years before you should propose it for 
inclusion into the standard library. By all means, distribute a design document 
for comment before you implement things; it's a reasonable practice. But don't 
bother with a PEP yet.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From arnodel at googlemail.com  Mon Mar  1 12:15:23 2010
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Mon, 01 Mar 2010 17:15:23 +0000
Subject: Looking for an Application
References: <mailman.62.1267462298.23598.python-list@python.org>
Message-ID: <m2mxysrmj8.fsf@googlemail.com>

Greg Lindstrom <greg.lindstrom at novasyshealth.com> writes:

> A few months ago there was a post dealing with an application that
> would power scripts based on graphical snippets of the screen.
> Essentially, the script would "look" for a match with what you pasted
> into it.  I don't recall the name of the application, but would like
> to try it.  Does anyone remember what it is?
>
> Thanks,
> --greg

Project SIKULI?

http://groups.csail.mit.edu/uid/sikuli/

-- 
Arnaud


From rantingrick at gmail.com  Mon Mar  1 12:18:12 2010
From: rantingrick at gmail.com (rantingrick)
Date: Mon, 1 Mar 2010 09:18:12 -0800 (PST)
Subject: Sample code usable Tkinter listbox
References: <hmf1qo$v9v$1@news.eternal-september.org>
	<5af8af6d-ecfc-4e4e-bba6-3622bbe874eb@o3g2000yqb.googlegroups.com>
	<hmfdvg$vu8$1@news.eternal-september.org>
	<0f801cb4-20fc-4955-bdf6-ec7a2bc5cecb@g19g2000yqe.googlegroups.com>
	<hmgbco$blv$1@news.eternal-september.org>
Message-ID: <a276c44c-d107-4d15-b05c-a16724defabf@q16g2000yqq.googlegroups.com>

On Mar 1, 6:19?am, "Alf P. Steinbach" <al... at start.no> wrote:

> > ? ? ? ? kw.setdefault('activestyle', 'none')
>
> Hm, let me steal this line... Thanks!

Yes! the default activestyle is quite annoying!


From mmitchell at transparent.com  Mon Mar  1 12:20:30 2010
From: mmitchell at transparent.com (Matt Mitchell)
Date: Mon, 1 Mar 2010 12:20:30 -0500
Subject: Is there a better way to do this?
Message-ID: <E3F00F47584F1944B69461EF94D1A74909F71CC4@transparent3.transparent.local>

Hi,

I wrote a python script that uses pysvn to export projects from an svn
repo I have.  The repo has hundreds of projects in it with a directory
structure that is pretty uniform however it's not exactly uniform
because of the capitalization.  I.e.:
\root
  \project English
      \Stuff
      \Stuff 2
  \Project Spanish
      \Stuff 3 
      \Stuff 4

My svn repo is case sensitive so if I try to get \root\project
Spanish\Stuff 3 I get an error.  Fixing the capitalization is not an
option for me.  My initial idea was to make a list of all the different
ways "project" has been capitalized in my repo and try each one.  The
code looks like this:

import pysvn

def getstuff(stuffiwant, languageiwantitin):
	projects = ("project %s/", "Project %s/", "pRojects %s/")
	c = pysvn.Client()
	for p in projects:
		exportme = p % languageiwantitin
		exportme = "http://localhost/" + exportme + stuffiwant
		try:
			c.export(exportme, "C:\\temp\\")
			break
		except pysvn.ClientError:
			print "Not the right capitalization."
	# do the rest of the stuff I need to do.

This works, but to me it seems like there has to be a better way of
doing it. Any feedback or suggestions would be appreciated. 

Thanks,
Matt


From usenot at geekmail.INVALID  Mon Mar  1 12:22:55 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Mon, 1 Mar 2010 18:22:55 +0100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
Message-ID: <20100301182255.3de59bc6@geekmail.INVALID>

On Tue, 02 Mar 2010 03:18:30 +1100 Lie Ryan <lie.1296 at gmail.com> wrote:

> On 03/02/10 00:09, Andreas Waldenburger wrote:
> > On Mon, 1 Mar 2010 05:01:49 -0800 (PST) alex23 <wuwei23 at gmail.com>
> > wrote:
> > 
> >> Andreas Waldenburger <use... at geekmail.INVALID> wrote:
> >>> But as I said: a) I am (we are) not in a position to impose this
> >>> (We don't work with the code, we just run the software).
> >>
> >> I personally believe that the end users have _every_ right to
> >> impose quality requirements on  code used within their
> >> business...although I may not bring this up in front of them at
> >> meetings :)
> > 
> > Huh? That's like demanding a certain type of truck or vehicle
> > maintenance plan from a trucking company. Sure, you *could* do it,
> > but that effectively only limits your options. I think there should
> > be a clear separation of concerns here.
> 
> If my truck contains food items that spoils quickly, I would want to
> make sure that the trucking company takes good care of their
> refrigeration system and that the truck have as little chance as
> possible for breakdown due to poor maintenance.

My point was that it should not be any of your concern *how* they do
it, only *that* they do it.

Back in the software world: Those guys write code that works. It does
what it's supposed to do. Why should we care where they put their
comments?

-- 
INVALID? DE!



From pmaupin at gmail.com  Mon Mar  1 12:34:47 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 09:34:47 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
Message-ID: <66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>

On Mar 1, 11:13?am, Robert Kern <robert.k... at gmail.com> wrote:
> Ignore it. That comment really doesn't apply to this case. That's for things
> that only make sense in the language or standard library, like context managers.
> For libraries like this, Steven's summary is correct. It needs to have a useful
> life as a third party package for a few years before you should propose it for
> inclusion into the standard library. By all means, distribute a design document
> for comment before you implement things; it's a reasonable practice. But don't
> bother with a PEP yet.

So, I went and re-read PEP 1, and in the fine print it directs me to
PEP 2.  Mea culpa -- I though I understood the PEP.

Nonetheless, the fact that I created what I call a "PEP draft" seems
to have had more read into it than I meant.  I will bear this in mind
when I start future projects.  I have a couple of projects, and
contribute to another, which in no way should wind up in the standard
library.  But I find the lack of a good, up-to-date, configuration
reader in the library to be an issue, which is why I had the temerity
to try to start a discussion on what a good standard configuration
file reader should be.

Yes, I would like to create something compelling enough to go into the
standard library. No, I don't expect it to wind up there for a very
long time, if ever.  BUT, at the same time, following the PEP format
is very valuable for my project.  It forces me to think more deeply
about the problem I am solving and it forces me to write down some
documentation.  Really, it's no more burdensome than any other similar
useful template.

Or, to put it another way, it is my goal (which I may or may not be
smart enough to reach) to write a module that anybody would want to
use; that is good enough to put into the standard library.  Whether
this happens or not, one useful tool to help the module down that path
(and produce a better module for me and other users even if it never
becomes part of the standard library) is to think about what it takes
to get into the standard library.  Part of this involves writing the
PEP.  Writing a PEP is a good exercise; the format itself helps me to
focus on important issues.

So I was writing the contents of the PEP anyway, just for me.  The
real question, then, is when to release the PEP (vs. the code).  I've
already got some coding done, but it is not yet good enough to share,
and if there is anybody else out there grappling with the same issues
at this time, I would prefer not to go into production with it until
they have had a chance to look over the design and offer insights and
criticisms.

Best regards,
Pat


From robert.kern at gmail.com  Mon Mar  1 12:42:16 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Mon, 01 Mar 2010 11:42:16 -0600
Subject: Docstrings considered too complicated
In-Reply-To: <20100301182255.3de59bc6@geekmail.INVALID>
References: <20100224212303.242222c6@geekmail.INVALID>	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>	<20100227191040.6c77f2d8@geekmail.INVALID>	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>	<20100301140943.4edca16b@geekmail.INVALID>	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
Message-ID: <hmgua9$a5i$1@dough.gmane.org>

On 2010-03-01 11:22 , Andreas Waldenburger wrote:

> Back in the software world: Those guys write code that works. It does
> what it's supposed to do. Why should we care where they put their
> comments?

Software usually needs to be maintained and extended over the course of its 
lifetime. The original team that wrote it may not be available in the future.

Furthermore, docstrings are not comments. They become part of the function 
object and can be introspected at runtime. This is a very important tool when 
working with code at the interactive prompt and for the collection of API 
documentation. Comments are less useful than docstrings; the OP's complaint was 
that his programmers were putting the function documentation in other places 
than docstrings, rendering them less useful than they could have been.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From jeanmichel at sequans.com  Mon Mar  1 12:42:17 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 01 Mar 2010 18:42:17 +0100
Subject: Docstrings considered too complicated
In-Reply-To: <20100301182255.3de59bc6@geekmail.INVALID>
References: <20100224212303.242222c6@geekmail.INVALID>	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>	<20100227191040.6c77f2d8@geekmail.INVALID>	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>	<20100301140943.4edca16b@geekmail.INVALID>	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
Message-ID: <4B8BFC79.10103@sequans.com>

Andreas Waldenburger wrote:
> On Tue, 02 Mar 2010 03:18:30 +1100 Lie Ryan <lie.1296 at gmail.com> wrote:
>
>   
>> On 03/02/10 00:09, Andreas Waldenburger wrote:
>>     
>>> On Mon, 1 Mar 2010 05:01:49 -0800 (PST) alex23 <wuwei23 at gmail.com>
>>> wrote:
>>>
>>>       
>>>> Andreas Waldenburger <use... at geekmail.INVALID> wrote:
>>>>         
>>>>> But as I said: a) I am (we are) not in a position to impose this
>>>>> (We don't work with the code, we just run the software).
>>>>>           
>>>> I personally believe that the end users have _every_ right to
>>>> impose quality requirements on  code used within their
>>>> business...although I may not bring this up in front of them at
>>>> meetings :)
>>>>         
>>> Huh? That's like demanding a certain type of truck or vehicle
>>> maintenance plan from a trucking company. Sure, you *could* do it,
>>> but that effectively only limits your options. I think there should
>>> be a clear separation of concerns here.
>>>       
>> If my truck contains food items that spoils quickly, I would want to
>> make sure that the trucking company takes good care of their
>> refrigeration system and that the truck have as little chance as
>> possible for breakdown due to poor maintenance.
>>     
>
> My point was that it should not be any of your concern *how* they do
> it, only *that* they do it.
>
> Back in the software world: Those guys write code that works. It does
> what it's supposed to do. Why should we care where they put their
> comments?
>
>   
If you've bought the code and want to maintain it, you'd better make 
sure it's possible.
By the way, the ISO 9001 standard ask for your out sourced processing to 
be compliant with your QA objectives, so if you care about your code, 
then you should care for the code you buy.

JM


From R.Brodie at rl.ac.uk  Mon Mar  1 12:47:59 2010
From: R.Brodie at rl.ac.uk (Richard Brodie)
Date: Mon, 1 Mar 2010 17:47:59 -0000
Subject: Is there a better way to do this?
References: <mailman.65.1267464765.23598.python-list@python.org>
Message-ID: <hmgukf$bdn$1@south.jnrs.ja.net>


"Matt Mitchell" <mmitchell at transparent.com> wrote in message 
news:mailman.65.1267464765.23598.python-list at python.org...
> My initial idea was to make a list of all the different
> ways "project" has been capitalized in my repo and try each one.  The
> code looks like this:

I would use pysvn.Client.list to get a list of files at whatever directory level
you require. Then you can do a case insensitive compare or whatever else.




From wolftracks at invalid.com  Mon Mar  1 12:49:58 2010
From: wolftracks at invalid.com (W. eWatson)
Date: Mon, 01 Mar 2010 09:49:58 -0800
Subject: Verifying My Troublesome Linkage Claim between Python and Win7
In-Reply-To: <hm21g1$p22$1@panix5.panix.com>
References: <hm0jn4$tnf$1@news.eternal-september.org>
	<hm21g1$p22$1@panix5.panix.com>
Message-ID: <hmguo8$itl$1@news.eternal-september.org>

On 2/23/2010 6:04 PM, Aahz wrote:
> In article<hm0jn4$tnf$1 at news.eternal-september.org>,
> W. eWatson<wolftracks at invalid.com>  wrote:
>>
>> My claim is that if one creates a program in a folder that reads a file
>> in the folder it and then copies it to another folder, it will read  the
>> data file in the first folder, and not a changed file in the new folder.
>> I'd appreciate it if some w7 users could try this, and let me know what
>> they find.
>>
>> My experience is that if one checks the properties of the copied file,
>> it will point to the original py file and execute it and not the copy.
>
> I've no time to verify your specific claim and have no readily available
> proof for mine, but I've seen similar issues on Win7.  AFAIK, this has
> nothing to do with Python.
I've been away for several days and have no idea if anyone above figured 
this out. Likely not,since your post is at the end.

Interesting about 'similar'. I'm pretty much done exploring every nook 
and cranny on this problem. It can be worked around. I will say that if 
I look at the properties of the copied file, it shows a shortcut tab 
that leads back to the original file. I have no recollection of making a 
shortcut, and always use Copy and Paste. Further, if I do create 
shortcut in W7, it adds "-shortcut to the file suffix. I do not ever 
recall seeing that anywhere. I just tried it in XP, and it puts it in 
front of the name.


From joaopcf at gmail.com  Mon Mar  1 12:54:20 2010
From: joaopcf at gmail.com (=?ISO-8859-1?Q?Jo=E3o?=)
Date: Mon, 1 Mar 2010 09:54:20 -0800 (PST)
Subject: [newbie] - python list into a sql query
Message-ID: <3b20cfbf-c31f-44c4-8fbc-f95ab71690ff@x22g2000yqx.googlegroups.com>

Hi.

Can someone guide me into getting this to work? It's just really
querying a DB of an Autodiscovery tool to have a bunch of updated dns
files.
(Thought I'm still building the first script steps) I was able to
successfully query the DB against a single groupid, but am failing in
passing a list of integers into the sql query.

I'm failing miserably in,

sql = '''SELECT ip, host, dns FROM zabbix_tst_db.hosts WHERE hostid IN
(
select hostid from hosts_groups WHERE groupid IN (' +
','.join(map(str, %s)) + ')''' % grp_range


with
    _mysql_exceptions.ProgrammingError: (1064, "You have an error in
your SQL syntax; check the manual that corresponds to your MySQL
server version for the right syntax to use near '' at line 1")



I'll gladly accept any other code change suggestion


    #!/usr/bin/env python

    import MySQLdb
    import sys, os
    import code

    builder_path = '/opt/scripts/dns_builder'
    grp_range = range(10,15)

    try:
            db = MySQLdb.connect(host="localhost",
                               user="tst",passwd="tst",db="tst_db" )
    except MySQLdb.Error, e:
        print "Error %d: %s" % (e.args[0], e.args[1])

    cursor = db.cursor()

    sql = '''SELECT ip, host, dns FROM zabbix_tst_db.hosts WHERE
hostid IN (
    select hostid from hosts_groups WHERE groupid IN (' +
','.join(map(str, %s)) + ')''' % grp_range

    cursor.execute(sql)

    f = open('%s/dns_unknown_list.txt', 'w+') % builder_path
    data = cursor.fetchall()

    for row in data:
    ip = row[0]
    host = row[1]
    dns = row[2]
    if host == dns:
      #tmn
      if ip[0][:10] in ('140.254.30','10.13.74.')
       group1_file = open('%s/group1.zone', 'w') % builder_path
       print >>group1_file, '''$ORIGIN group1

       '''
       print >>group1_file, '%s IN A    %s' % (dns, ip)
      elif ip[0][:3] in ('8.128.46.','6.128.101')
       group2_file = open('%s/group2.zone', 'w') % builder_path
       print >>group2_file, '''$ORIGIN group2

       '''
       print >>group2_file, '%s IN A    %s' % (dns, ip)
      else:
       print >>f, 'unknown     IN A    %s' % ip

    db.close()
    input_file.close()
    f.close()


From no.email at nospam.invalid  Mon Mar  1 13:03:33 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Mon, 01 Mar 2010 10:03:33 -0800
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
Message-ID: <7xljebyl56.fsf@ruckus.brouhaha.com>

Patrick Maupin <pmaupin at gmail.com> writes:
> it is my goal (which I may or may not be smart enough to reach) to
> write a module that anybody would want to use;

But you are working on a solution in search of a problem.  The really
smart thing to do would be pick something more useful to work on.  We
don't need another configuration language.  I can't even say "yet
another" because there's already a "yet another" called yaml.


From robert.kern at gmail.com  Mon Mar  1 13:05:06 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Mon, 01 Mar 2010 12:05:06 -0600
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
Message-ID: <hmgvl3$g91$1@dough.gmane.org>

On 2010-03-01 11:34 , Patrick Maupin wrote:
> On Mar 1, 11:13 am, Robert Kern<robert.k... at gmail.com>  wrote:
>> Ignore it. That comment really doesn't apply to this case. That's for things
>> that only make sense in the language or standard library, like context managers.
>> For libraries like this, Steven's summary is correct. It needs to have a useful
>> life as a third party package for a few years before you should propose it for
>> inclusion into the standard library. By all means, distribute a design document
>> for comment before you implement things; it's a reasonable practice. But don't
>> bother with a PEP yet.
>
> So, I went and re-read PEP 1, and in the fine print it directs me to
> PEP 2.  Mea culpa -- I though I understood the PEP.
>
> Nonetheless, the fact that I created what I call a "PEP draft" seems
> to have had more read into it than I meant.  I will bear this in mind
> when I start future projects.  I have a couple of projects, and
> contribute to another, which in no way should wind up in the standard
> library.  But I find the lack of a good, up-to-date, configuration
> reader in the library to be an issue, which is why I had the temerity
> to try to start a discussion on what a good standard configuration
> file reader should be.
>
> Yes, I would like to create something compelling enough to go into the
> standard library. No, I don't expect it to wind up there for a very
> long time, if ever.  BUT, at the same time, following the PEP format
> is very valuable for my project.  It forces me to think more deeply
> about the problem I am solving and it forces me to write down some
> documentation.  Really, it's no more burdensome than any other similar
> useful template.

Certainly. The PEP format is a useful one. I've used it myself for some numpy 
design documents. But can you see why people might get confused about your 
intentions when you call it a draft PEP and post it to python-dev? If you stop 
calling it a PEP and stop talking about putting it in the standard library, 
people will stop being distracted by those issues.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From maygeo at netplus.ch  Mon Mar  1 13:07:17 2010
From: maygeo at netplus.ch (Raphael Mayoraz)
Date: Mon, 01 Mar 2010 10:07:17 -0800
Subject: Variable definition
In-Reply-To: <4B887224.2080805@optimum.net>
References: <4B885A0B.9040705@netplus.ch> <4B887224.2080805@optimum.net>
Message-ID: <4B8C0255.3090509@netplus.ch>

John Posner wrote:
> On 2/26/2010 6:32 PM, Raphael Mayoraz wrote:
>> Hello,
>>
>> I'd like to define variables with some specific name that has a common
>> prefix.
>> Something like this:
>>
>> varDic = {'red': 'a', 'green': 'b', 'blue': 'c'}
>> for key, value in varDic.iteritems():
>> 'myPrefix' + key = value
>>
>
> No trick, just swap a new key-value pair for each existing pair:
>
>   for key, value in varDic.iteritems():
>       varDic[myPrefix + key] = value
>       del varDict[key]
>
> Just make sure that *myPrefix* isn't an empty string!
>
> -John
Thanks for your answer.
However, your solution changes the key name in the dictionary.
That's not what I want I need to do. What I want is to define a new
variable which name is define as a string: 'myPrefx' + key. In the example
I give, I would get 3 variables:
myPrefixred = a
myPrefixgreen = b
myPrefixblue = c

Raphael


From fetchinson at googlemail.com  Mon Mar  1 13:40:00 2010
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Mon, 1 Mar 2010 19:40:00 +0100
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <7xljebyl56.fsf@ruckus.brouhaha.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
Message-ID: <fbe2e2101003011040lc2b965ek4f650801d00cae54@mail.gmail.com>

>> it is my goal (which I may or may not be smart enough to reach) to
>> write a module that anybody would want to use;
>
> But you are working on a solution in search of a problem.  The really
> smart thing to do would be pick something more useful to work on.  We
> don't need another configuration language.  I can't even say "yet
> another" because there's already a "yet another" called yaml.

And in case you are new here let me assure you that Paul is saying
this with his full intention of being helpful to you. I also would
think that working on such a project might be fun and educational for
you but completely useless if you have users other than yourself in
mind. Again, I'm trying to be helpful here, so you can focus on a
project that is both fun/educational for you and also potentially
useful for others. This RSON business is not one of them.

Cheers,
Daniel



-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From python at mrabarnett.plus.com  Mon Mar  1 13:44:49 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Mon, 01 Mar 2010 18:44:49 +0000
Subject: [newbie] - python list into a sql query
In-Reply-To: <3b20cfbf-c31f-44c4-8fbc-f95ab71690ff@x22g2000yqx.googlegroups.com>
References: <3b20cfbf-c31f-44c4-8fbc-f95ab71690ff@x22g2000yqx.googlegroups.com>
Message-ID: <4B8C0B21.8010404@mrabarnett.plus.com>

Jo?o wrote:
> Hi.
> 
> Can someone guide me into getting this to work? It's just really
> querying a DB of an Autodiscovery tool to have a bunch of updated dns
> files.
> (Thought I'm still building the first script steps) I was able to
> successfully query the DB against a single groupid, but am failing in
> passing a list of integers into the sql query.
> 
> I'm failing miserably in,
> 
> sql = '''SELECT ip, host, dns FROM zabbix_tst_db.hosts WHERE hostid IN
> (
> select hostid from hosts_groups WHERE groupid IN (' +
> ','.join(map(str, %s)) + ')''' % grp_range
> 
> 
> with
>     _mysql_exceptions.ProgrammingError: (1064, "You have an error in
> your SQL syntax; check the manual that corresponds to your MySQL
> server version for the right syntax to use near '' at line 1")
> 
[snip]
The triple-quoted string starts at:

     '''SELECT ...

and ends at:

     ...)''' % grp_range

which means that the part where you do the .join is _inside_ the string.


From pmaupin at gmail.com  Mon Mar  1 13:45:07 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 10:45:07 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
Message-ID: <466b86b0-a115-4871-b17c-b16d7d74fce0@y17g2000yqd.googlegroups.com>

On Mar 1, 12:03?pm, Paul Rubin <no.em... at nospam.invalid> wrote:

> But you are working on a solution in search of a problem. ?The really
> smart thing to do would be pick something more useful to work on. ?We
> don't need another configuration language. ?I can't even say "yet
> another" because there's already a "yet another" called yaml.

The only "in search of" here is that, instead of working on a point
solution for my particular problem, I am "in search of" a solution
that is a bit more elegant and general, and that might help solve
other people's problems too.  If you are not one of those that has
this sort of problem at this point in time, then feel free to kill-
file this thread.

Thanks,
Pat


From leo.shklovskii at gmail.com  Mon Mar  1 13:47:42 2010
From: leo.shklovskii at gmail.com (Leo)
Date: Mon, 1 Mar 2010 10:47:42 -0800 (PST)
Subject: python shell crashing on paste
References: <1ede46e4-8ca1-4fe0-ad3f-7e781bbe1182@b36g2000pri.googlegroups.com>
	<4b84ca31$0$15832$ba4acef3@reader.news.orange.fr>
Message-ID: <227e3061-db36-4188-a174-74019814af63@t31g2000prh.googlegroups.com>

Thanks for responding Michel. It looks like its an issue with
pyreadline - http://ipython.scipy.org/moin/PyReadline/Intro - causing
the crash. I'm working with the author of it on trying to get the
issue figured out.

It's not related to UAC.

--
--Leo

On Feb 23, 10:41?pm, "Michel Claveau -
MVP"<enleverLesX_XX... at XmclavXeauX.com.invalid> wrote:
> Hi!
>
> Where (directory) are you, when the problem come?
> Have you try with UAC disabled?
>
> @+
> -- ?
> MCI



From rami.chowdhury at gmail.com  Mon Mar  1 14:04:25 2010
From: rami.chowdhury at gmail.com (Rami Chowdhury)
Date: Mon, 1 Mar 2010 11:04:25 -0800
Subject: [newbie] - python list into a sql query
In-Reply-To: <3b20cfbf-c31f-44c4-8fbc-f95ab71690ff@x22g2000yqx.googlegroups.com>
References: <3b20cfbf-c31f-44c4-8fbc-f95ab71690ff@x22g2000yqx.googlegroups.com>
Message-ID: <201003011104.25211.rami.chowdhury@gmail.com>

On Monday 01 March 2010 09:54:20 Jo?o wrote:
> Hi.
> 
> Can someone guide me into getting this to work? It's just really
> querying a DB of an Autodiscovery tool to have a bunch of updated dns
> files.

I wouldn't be building SQL queries by hand if I could avoid it -- is this just 
a few one-off scripts or a project that could usefully benefit from a database 
abstraction layer (like SQLAlchemy: http://www.sqlalchemy.org)?

> 
> sql = '''SELECT ip, host, dns FROM zabbix_tst_db.hosts WHERE hostid IN
> (
> select hostid from hosts_groups WHERE groupid IN (' +
> ','.join(map(str, %s)) + ')''' % grp_range
> 

I'm not sure what you expect this to evaluate to?

#>>> grp_range = [1, 2, 3] # dummy data
#>>> sql = '''SELECT ip, host, dns FROM zabbix_tst_db.hosts WHERE hostid IN
... (
... SELECT hostid FROM hosts_groups WHERE groupid IN (' + 
... ','.join(map(str, %s)) + ')''' % grp_range
#>>> print sql
SELECT ip, host, dns FROM zabbix_tst_db.hosts WHERE hostid IN
(
SELECT hostid FROM hosts_groups WHERE groupid IN (' + 
','.join(map(str, [1, 2, 3])) + ')

Since the triple-quoted string only ends at the corresponding triple quote, 
you're including some Python code into the string instead of executing it. If 
you really want to splice the elements of grp_range into the query, you should 
do something like:

#>>> sql = 'SELECT ip, host, dns FROM zabbix_tst_db.hosts WHERE hostid IN 
(SELECT hostid FROM hosts_groups WHERE groupid IN (%s))' % ",".join(str(x) for 
x in grp_range)
#>>> sql
'SELECT ip, host, dns FROM zabbix_tst_db.hosts WHERE hostid IN (SELECT hostid 
FROM hosts_groups WHERE groupid IN (1,2,3))'

Although, really, if you can, I'd parameterise the query (http://mysql-
python.sourceforge.net/MySQLdb-1.2.2/public/MySQLdb.cursors.BaseCursor-
class.html#execute) at the very least...

> 
> with
>     _mysql_exceptions.ProgrammingError: (1064, "You have an error in
> your SQL syntax; check the manual that corresponds to your MySQL
> server version for the right syntax to use near '' at line 1")
> 
> 
> 
> I'll gladly accept any other code change suggestion
> 
> 
>     #!/usr/bin/env python
> 
>     import MySQLdb
>     import sys, os
>     import code
> 
>     builder_path = '/opt/scripts/dns_builder'
>     grp_range = range(10,15)
> 
>     try:
>             db = MySQLdb.connect(host="localhost",
>                                user="tst",passwd="tst",db="tst_db" )
>     except MySQLdb.Error, e:
>         print "Error %d: %s" % (e.args[0], e.args[1])
> 
>     cursor = db.cursor()
> 
>     sql = '''SELECT ip, host, dns FROM zabbix_tst_db.hosts WHERE
> hostid IN (
>     select hostid from hosts_groups WHERE groupid IN (' +
> ','.join(map(str, %s)) + ')''' % grp_range
> 
>     cursor.execute(sql)
> 
>     f = open('%s/dns_unknown_list.txt', 'w+') % builder_path
>     data = cursor.fetchall()
> 
>     for row in data:
>     ip = row[0]
>     host = row[1]
>     dns = row[2]
>     if host == dns:
>       #tmn
>       if ip[0][:10] in ('140.254.30','10.13.74.')
>        group1_file = open('%s/group1.zone', 'w') % builder_path
>        print >>group1_file, '''$ORIGIN group1
> 
>        '''
>        print >>group1_file, '%s IN A    %s' % (dns, ip)
>       elif ip[0][:3] in ('8.128.46.','6.128.101')
>        group2_file = open('%s/group2.zone', 'w') % builder_path
>        print >>group2_file, '''$ORIGIN group2
> 
>        '''
>        print >>group2_file, '%s IN A    %s' % (dns, ip)
>       else:
>        print >>f, 'unknown     IN A    %s' % ip
> 
>     db.close()
>     input_file.close()
>     f.close()


----
Rami Chowdhury
"As an online discussion grows longer, the probability of a comparison 
involving Nazis or Hitler approaches one." -- Godwin's Law
408-597-7068 (US) / 07875-841-046 (UK) / 01819-245544 (BD)


From pmaupin at gmail.com  Mon Mar  1 14:18:20 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 11:18:20 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<mailman.68.1267466740.23598.python-list@python.org>
Message-ID: <062d989e-27db-46b3-913f-0573bb70543f@y17g2000yqd.googlegroups.com>

>
> Certainly. The PEP format is a useful one. I've used it myself for some numpy
> design documents. But can you see why people might get confused about your
> intentions when you call it a draft PEP and post it to python-dev? If you stop
> calling it a PEP and stop talking about putting it in the standard library,
> people will stop being distracted by those issues.

As I mentioned, I didn't see the fine print in PEP 1 about PEP 2 being
the document for library modules.  As I mentioned, mea culpa.  It is
painfully obvious that some don't like the way I have gone about
describing the project.  They obviously view me announcing this as
premature, or presumptuous, or something, and they have some sort of
visceral reaction to that.

However, I do not believe that any people (other than me) were really
confused in the process.  I made my intentions clear, and some people
reacted badly to that because I didn't follow the process (for which I
apologize again).  But calling it a draft PEP is a distraction
(because of the visceral reaction), but is not really what I would
call confusing.  My intention actually is to try to build something
that is worthy of the standard library, and to eventually try to get
it accepted, because I perceive a hole there, with a lot of point
solutions being done to solve a common problem, and I believe the
pushback is coming from people who fully understood that intention
from my posting.

I will try to say "hey -- here's a hole in the library and a proposal
for how to fix it" more diplomatically and in the correct forum in the
future, but it would be disingenuous for me to disown my goal of
getting a better configparser into the standard library.

Regards,
Pat


From pmaupin at gmail.com  Mon Mar  1 14:30:28 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 11:30:28 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org>
Message-ID: <3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>

On Mar 1, 12:40?pm, Daniel Fetchinson <fetchin... at googlemail.com>
wrote:
> > But you are working on a solution in search of a problem. ?The really
> > smart thing to do would be pick something more useful to work on. ?We
> > don't need another configuration language. ?I can't even say "yet
> > another" because there's already a "yet another" called yaml.
>
> And in case you are new here let me assure you that Paul is saying
> this with his full intention of being helpful to you. I also would
> think that working on such a project might be fun and educational for
> you but completely useless if you have users other than yourself in
> mind. Again, I'm trying to be helpful here, so you can focus on a
> project that is both fun/educational for you and also potentially
> useful for others. This RSON business is not one of them.

OK, but I am a bit unclear on what you and/or Paul are claiming.  It
could be one of a number of things.  For example:

- There is a preexisting file format suitable for my needs, so I
should not invent another one.

- If I invent a file format suitable for my needs, it couldn't
possibly be general enough for anybody else.

- Even if it was general enough for somebody else, there would only be
two of them.

I've been known to waste time (or be accused of wasting time) on
various endeavors, but I like to know exactly *why* it is perceived to
be a waste.

Regards,
Pat


From jjposner at optimum.net  Mon Mar  1 14:34:53 2010
From: jjposner at optimum.net (John Posner)
Date: Mon, 01 Mar 2010 14:34:53 -0500
Subject: Variable definition
In-Reply-To: <4B8C0255.3090509@netplus.ch>
References: <4B885A0B.9040705@netplus.ch> <4B887224.2080805@optimum.net>
	<4B8C0255.3090509@netplus.ch>
Message-ID: <4B8C16DD.40506@optimum.net>

On 3/1/2010 1:07 PM, Raphael Mayoraz wrote:
> John Posner wrote:
>> On 2/26/2010 6:32 PM, Raphael Mayoraz wrote:
>>> Hello,
>>>
>>> I'd like to define variables with some specific name that has a common
>>> prefix.
>>> Something like this:
>>>
>>> varDic = {'red': 'a', 'green': 'b', 'blue': 'c'}
>>> for key, value in varDic.iteritems():
>>> 'myPrefix' + key = value
>>>
>>
>> No trick, just swap a new key-value pair for each existing pair:
>>
>> for key, value in varDic.iteritems():
>> varDic[myPrefix + key] = value
>> del varDict[key]
>>
>> Just make sure that *myPrefix* isn't an empty string!
>>
>> -John
> Thanks for your answer.
> However, your solution changes the key name in the dictionary.
> That's not what I want I need to do. What I want is to define a new
> variable which name is define as a string: 'myPrefx' + key. In the example
> I give, I would get 3 variables:
> myPrefixred = a
> myPrefixgreen = b
> myPrefixblue = c

Yes, I misinterpreted your request. I believe there's a consensus around 
here that you shouldn't even try to accomplish your goal. Instead of 
creating *myPrefixred* as a (module-)global name or a (function-)local 
name, you should just use the dictionary as-is: *varDict['red']*. Or 
maybe make the names into attributes of a class, as Alex Goretoy 
suggested. [1]

Can you present a convincing argument as to why you really, really need 
to use the name *myPrefixred* ?

-John

[1] http://mail.python.org/pipermail/python-list/2010-February/1237736.html





From helps4indian at gmail.com  Mon Mar  1 14:37:03 2010
From: helps4indian at gmail.com (coolboy8)
Date: Mon, 1 Mar 2010 11:37:03 -0800 (PST)
Subject: Best auto insurance company // Best auto insurance company /// Best 
	auto insurance company  ///
Message-ID: <795a705c-5564-4cf8-8b83-71d2aeae4a53@s36g2000prf.googlegroups.com>

VISIT http://alturl.com/8xs8


From no.email at nospam.invalid  Mon Mar  1 14:37:39 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Mon, 01 Mar 2010 11:37:39 -0800
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org>
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
Message-ID: <7xhbozrfy4.fsf@ruckus.brouhaha.com>

Patrick Maupin <pmaupin at gmail.com> writes:
> - There is a preexisting file format suitable for my needs, so I
> should not invent another one.

There are in fact quite a few--json, yaml, .ini, xml, Python literals
(http://code.activestate.com/recipes/364469-safe-eval/), s-expressions,
actual Python code that the application can import, and so forth.

The problem isn't that you're trying to invent a useless file format per
se, but rather that in trying to get other people to learn it and use
it, you're also trying to appropriate a chunk of the user community's
scarce and precious brain cells without good justification.  Newbie
designers are often lured into that and they're unfortunately (i.e. to
the community's detrimtent) often more successful than they really
should be.

Your one complaint about yaml is that it's slow to parse.  Why do you
care about the parsing speed of a config file?  If the existing
implementation is too slow, why not write a faster one instead of
designing yayaml?  Even yaml is excessive in my view.  "Yet another" was
an ok plan when Steve Johnson started the trope by writing Yacc 30 years
ago.  These days, don't do yet another without very convincing reasons
for rejecting what is already there.


From tjreedy at udel.edu  Mon Mar  1 14:41:27 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 01 Mar 2010 14:41:27 -0500
Subject: AOP decorator?
In-Reply-To: <9437135d-e2f7-4317-a5bd-46346fa5b5fb@q21g2000yqm.googlegroups.com>
References: <9437135d-e2f7-4317-a5bd-46346fa5b5fb@q21g2000yqm.googlegroups.com>
Message-ID: <hmh595$6do$1@dough.gmane.org>

On 3/1/2010 11:22 AM, gentlestone wrote:
> Hi,
>
> suppose my source code looks like:
> --------------------------------
>    import aspect_xy
>    class Basic(object, aspect_xy.Basic):
>      pass # basic attributes and methods ...

As a sidenote, this violates my understanding of aspect-oriented 
programming, which is to add aspects that go across several derived 
classes. But...

> --------------------------------
> and the source code of aspect_xy.py is:
> --------------------------------
>    class Basic(object):
>      pass  # aspect extra attributes and methods ...
> --------------------------------
> how can I write this with decorators? I want something like:
> -------------------------------
>    import aspect_xy
>    @aspect_xy # extra attributes and methods ...
>    class Basic(object):
>      pass # basic attributes and methods ...
> ----------------------------------------------------------
> I want to write class decorator function, which:
> 1. Takes the basic class as parameter
> 2. Find the same class name in aspect_xy.py
> 3. Inherit the found aspect class
> Is it possible?

You would have to look at the difference between Basic with and without 
the explicit base class and patch the latter to look like the former. At 
minimum, you would have to fix .__bases__ and .__mro__, but I do not 
know if those are writable. To me, it seems easier to be explicit.

tjr



From joncle at googlemail.com  Mon Mar  1 14:49:39 2010
From: joncle at googlemail.com (Jon Clements)
Date: Mon, 1 Mar 2010 11:49:39 -0800 (PST)
Subject: AOP decorator?
References: <9437135d-e2f7-4317-a5bd-46346fa5b5fb@q21g2000yqm.googlegroups.com>
Message-ID: <0d3daa47-cb27-4134-a6b5-be3824f5cf0b@f8g2000yqn.googlegroups.com>

On Mar 1, 4:22?pm, gentlestone <tibor.b... at hotmail.com> wrote:
> Hi,
>
> suppose my source code looks like:
> --------------------------------
> ? import aspect_xy
> ? class Basic(object, aspect_xy.Basic):
> ? ? pass # basic attributes and methods ...
> --------------------------------
> and the source code of aspect_xy.py is:
> --------------------------------
> ? class Basic(object):
> ? ? pass ?# aspect extra attributes and methods ...
> --------------------------------
> how can I write this with decorators? I want something like:
> -------------------------------
> ? import aspect_xy
> ? @aspect_xy # extra attributes and methods ...
> ? class Basic(object):
> ? ? pass # basic attributes and methods ...
> ----------------------------------------------------------
> I want to write class decorator function, which:
> 1. Takes the basic class as parameter
> 2. Find the same class name in aspect_xy.py
> 3. Inherit the found aspect class
> Is it possible?

Untested and written quickly, so all possible disclaimers apply ;)

class BaseObject(object):
    pass

def aspect_xy_dec(base):
    def wrapper(cls):
	return type(cls.__name__, (base, getattr(aspect_xy, cls.__name__)),
{})
    return wrapper

@aspect_xy(BaseObject)
class SomeObject:
    pass


Cheers,

Jon.




From pmaupin at gmail.com  Mon Mar  1 14:59:13 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 11:59:13 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org> 
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com> 
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
Message-ID: <9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>

On Mar 1, 1:37?pm, Paul Rubin <no.em... at nospam.invalid> wrote:
> There are in fact quite a few--json, yaml, .ini, xml, Python literals
> (http://code.activestate.com/recipes/364469-safe-eval/), s-expressions,
> actual Python code that the application can import, and so forth.

Yes, I know about those.

> The problem isn't that you're trying to invent a useless file format per
> se, but rather that in trying to get other people to learn it and use
> it, you're also trying to appropriate a chunk of the user community's
> scarce and precious brain cells without good justification. ?Newbie
> designers are often lured into that and they're unfortunately (i.e. to
> the community's detrimtent) often more successful than they really
> should be.

Can't disagree with the statement about newbie designers.  On the flip
side, sometimes things wind up being defacto standards, simply because
nobody could be bothered to write a better one, and they have lots of
little niggling warts that also collectively take up a lot of time and
attention.  There is obviously a good balance somewhere.

> Your one complaint about yaml is that it's slow to parse. ?Why do you
> care about the parsing speed of a config file? ?If the existing
> implementation is too slow, why not write a faster one instead of
> designing yayaml? ?Even yaml is excessive in my view. ?"Yet another" was
> an ok plan when Steve Johnson started the trope by writing Yacc 30 years
> ago. ?These days, don't do yet another without very convincing reasons
> for rejecting what is already there.

One of my complaints.  If you had read the document you would have
seen others.  I actually have several complaints about YAML, but I
tried to write a cogent summary.

Regards,
Pat


From bdesth.quelquechose at free.quelquepart.fr  Mon Mar  1 14:59:55 2010
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Mon, 01 Mar 2010 20:59:55 +0100
Subject: Method / Functions - What are the differences?
In-Reply-To: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
Message-ID: <4b8c2a34$0$10470$426a74cc@news.free.fr>

Michael Rudolf a ?crit :
> Out of curiosity I tried this and it actually worked as expected:
> 
>>>> class T(object):
>     x=[]
>     foo=x.append
>     def f(self):
>         return self.x
> 
>     
>>>> t=T()
>>>> t.f()
> []
>>>> T.foo(1)
>>>> t.f()
> [1]
>>>>
> 
> At first I thought "hehe, always fun to play around with python. Might
> be useful sometimes" - but then It really confused me what I did. I
> mean: f is what we call a method, right? 

Wrong. It's a function. T.f is an unbound method (in python 2.x at
least) and t.f is a bound method.

> But was is foo?

A bound method. Bound to x, of course.

> It is not a
> method and not a classmethod as it accepts no self and no cls.

Yes it does. Else how would t.foo(4) (or T.foo(4)) append 4 to x ?

> Perhaps this all does not matter, 

It does.

> but now I am really confused about the
> terminology. So: what makes a method a method?

The right question is: what makes a function a method !-)

> And of what type?

Answer here:

http://groups.google.com/group/comp.lang.python/tree/browse_frm/thread/bd71264b6022765c/3a77541bf9d6617d#doc_89d608d0854dada0

I really have to put this in the wiki :-/


From no.email at nospam.invalid  Mon Mar  1 15:08:58 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Mon, 01 Mar 2010 12:08:58 -0800
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org>
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
Message-ID: <7x635fdcth.fsf@ruckus.brouhaha.com>

Patrick Maupin <pmaupin at gmail.com> writes:
> One of my complaints.  If you had read the document you would have
> seen others.  I actually have several complaints about YAML, but I
> tried to write a cogent summary.

Yaml sucks, but seems to have gotten some traction regardless.
Therefore the Python principle of "there should be one and only one
obvious way to do it" says: don't try to replace the existing thing if
your new thing is only slightly better.  Just deal with the existing
thing's imperfections or make improvements to it.  If you can make a
really powerful case that your new thing is 1000x better than the old
thing, that's different, but I don't think we're seeing that here.

Also, XML is used for pretty much everything in the Java world.  It
sucks too, but it is highly standardized, it observably gets the job
done, there are tons of structure editors for it, etc.  Frankly
I'd rather have stayed with it than deal with Yaml.

There are too many of these damn formats.  We should ban all but one of
them (I don't much care which one).  And making even more of them is not
the answer.


From usenot at geekmail.INVALID  Mon Mar  1 15:24:13 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Mon, 1 Mar 2010 21:24:13 +0100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.67.1267465365.23598.python-list@python.org>
Message-ID: <20100301212413.5694580e@geekmail.INVALID>

On Mon, 01 Mar 2010 11:42:16 -0600 Robert Kern <robert.kern at gmail.com>
wrote:

> On 2010-03-01 11:22 , Andreas Waldenburger wrote:
> 
> > Back in the software world: Those guys write code that works. It
> > does what it's supposed to do. Why should we care where they put
> > their comments?
> 
> Software usually needs to be maintained and extended over the course
> of its lifetime. The original team that wrote it may not be available
> in the future.
> 
> Furthermore, docstrings are not comments. They become part of the
> function object and can be introspected at runtime. This is a very
> important tool when working with code at the interactive prompt and
> for the collection of API documentation. Comments are less useful
> than docstrings; the OP's complaint was that his programmers were
> putting the function documentation in other places than docstrings,
> rendering them less useful than they could have been.
> 

No, the OP complained about those guys being idiots. I should know,
because I posted it.

/W

-- 
INVALID? DE!



From usenot at geekmail.INVALID  Mon Mar  1 15:29:54 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Mon, 1 Mar 2010 21:29:54 +0100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
Message-ID: <20100301212954.7aa0b99d@geekmail.INVALID>

On Mon, 01 Mar 2010 18:42:17 +0100 Jean-Michel Pichavant
<jeanmichel at sequans.com> wrote:

> Andreas Waldenburger wrote:
> [snip]
> > Back in the software world: Those guys write code that works. It
> > does what it's supposed to do. Why should we care where they put
> > their comments?
> >
> >   
> If you've bought the code and want to maintain it, you'd better make 
> sure it's possible.
> 
Fair enough, but we don't want to maintain it.


> By the way, the ISO 9001 standard ask for your out sourced processing
> to be compliant with your QA objectives, so if you care about your
> code, then you should care for the code you buy.
> 
We did not buy code. If it were written in C or such, we would never
get to see it.

It's not our concern.

/W

-- 
INVALID? DE!



From pmaupin at gmail.com  Mon Mar  1 15:35:46 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 12:35:46 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org> 
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com> 
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
Message-ID: <2804c8c0-ffe5-4dde-b076-3e0948c32021@g11g2000yqe.googlegroups.com>

On Mar 1, 2:08?pm, Paul Rubin <no.em... at nospam.invalid> wrote:

> Yaml sucks, but seems to have gotten some traction regardless.

Yes, that's actually one of the reasons I want to do this.  I've heard
that some of the YAML people want that in the standard library, and
IMHO that would be a huge mistake.

> Therefore the Python principle of "there should be one and only one
> obvious way to do it" says: don't try to replace the existing thing if
> your new thing is only slightly better.

But for my use-case, YAML is irretrievably broken.  Sure, it looks
reasonably nice, but it increases regression runtime unacceptably.
Also, despite their current protestations that Yaml AIN'T markup
language, the syntax still belies its markup roots.  I'm looking for a
configuration language, not a markup language.

>?Just deal with the existing thing's imperfections or make improvements to it.

Well, I've looked at the YAML parser and I can assure you that I will
not be contributing to that project.

> If you can make a really powerful case that your new thing is 1000x better than the old thing, that's different, but I don't think we're seeing that here.

Well, there's no way I'm hitting three orders of magnitude, but I
don't think the bar is really that high.  We will see.

> Also, XML is used for pretty much everything in the Java world. ?It
> sucks too, but it is highly standardized, it observably gets the job
> done, there are tons of structure editors for it, etc. ?Frankly
> I'd rather have stayed with it than deal with Yaml.

XML can certainly be made readable by humans.  It's hard to make it
writeable by (average) humans just using a regular text editor, and
even though there are tons of structure editors, requiring non-
technical people to find one of those and start using it is a non-
starter in many cases.  But I can't strongly disagree with the opinion
that YAML doesn't offer all that much over it.

> There are too many of these damn formats. ?We should ban all but one of
> them (I don't much care which one). ?And making even more of them is not
> the answer.

Well, I think that XML and YAML both overreach by trying to be all
things to all applications.  So I'm aiming a lot lower than that.  I
just want to make really good configuration files that are easy to
modify in a text editor.

None of the existing formats are suitable.  I may be the only one who
feels that way.  OTOH, if we never invented new things, then I
wouldn't be enjoying restructured text, and I'd be missing out on a
lot there...

Regards,
Pat


From no.email at nospam.invalid  Mon Mar  1 15:42:20 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Mon, 01 Mar 2010 12:42:20 -0800
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org>
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
	<2804c8c0-ffe5-4dde-b076-3e0948c32021@g11g2000yqe.googlegroups.com>
Message-ID: <7xwrxv4vv7.fsf@ruckus.brouhaha.com>

Patrick Maupin <pmaupin at gmail.com> writes:
> But for my use-case, YAML is irretrievably broken.  Sure, it looks
> reasonably nice, but it increases regression runtime unacceptably.

How big are the files that you want to parse with it?  Sheesh.

> Well, I've looked at the YAML parser and I can assure you that I will
> not be contributing to that project.

So write a new one that parses the same syntax, but cleaner and faster.

> XML can certainly be made readable by humans.  It's hard to make it
> writeable by (average) humans just using a regular text editor,

I do it all the time; it's a bit dreary but not difficult.  And there is
absolutely no way to get anything done in this field anymore without
dealing with XML from time to time.  So given that we all have some
experience using it, it's sensible to stick with it.

> None of the existing formats are suitable.  I may be the only one who
> feels that way.  OTOH, if we never invented new things, then I
> wouldn't be enjoying restructured text, and I'd be missing out on a
> lot there...

ReST is another abomination that should never have gotten off the
ground.  It is one of the reasons I react so negatively to your
config format proposal.  It just sounds like more of the same.


From urbangabo at gmail.com  Mon Mar  1 15:53:57 2010
From: urbangabo at gmail.com (Gabor Urban)
Date: Mon, 1 Mar 2010 21:53:57 +0100
Subject: Class attributes / methods..... full Python script
Message-ID: <f7ac28aa1003011253s1c11acf2j243aa0277e57082e@mail.gmail.com>

Hi guys,

thanks for the ideas. Here you are the code. Not transcoded from Java
for I do not know Java enough..

I am scanning an XML file, and have a large ammount of logging.

Any ideas are wellcome as before....

Thnx

Code:>

#---------------------------------------------
## Generate CSV from OEP History XML
#---------------------------------------------

import sys
import os
from xml.dom.minidom import parse, parseString
import xml.dom
import logging

versionStr = '0.01'

class Item:
    def __init__(self, pId, pChange, pComment):
        self.ID = pId
        self.Delta = pChange
        self.Comment = pComment

    def PrintItem(self):
        str = '%s,%s,%s'%(self.ID,self.Delta,self.comment)
        return str

class Package:
    def __init__(self, pSerial, pDate, pOwner, pSchema):
        self.serial = pSerial
        self.date = pDate
        self.owner = pOwner
        self.schema = pSchema
        self.items = []

    def insertItem(self, pItem):
        self.items.append(pItem)

    def printPackage(self):
        lines = []
        str = '%s,%s,%s,%s'%(self.serial,self.date,self.owner,self.schema)
        number = self.items.length
        for idx in xrange(number):
            line = ''
            istr = self.items[idx].PrintItem()
            line = str + ',' + istr
            lines.append(line)
        return lines

def getItem(tracer, pkgItem, itemName):
    retval = -1
    name = ""
    found = 0
    str = ""
    tracer.info('Function getItem entry, name = %s',itemName)
    nItem = pkgItem.getElementsByTagName(itemName).item(0)
    for node in pkgItem.childNodes:
        if node.nodeType != xml.dom.Node.TEXT_NODE:
            tracer.debug('Scanning node name = %s',node.nodeName)
            if node.nodeName == itemName:
                tracer.debug('Pkg %s found',itemName)
            else:
                tracer.warning('Pkg %s is not found',itemName)
                continue
            for entity in node.childNodes:
                if entity.nodeType == xml.dom.Node.TEXT_NODE:
                    retval = entity.nodeValue
                    tracer.debug("Node value found %s",retval)
                    found = 1
                    break
        if found == 1:
            break
    tracer.debug('Function getItem returns %s',retval)
    return retval

logger = logging.getLogger('XmlHistory')
handler = logging.FileHandler("Xmlhistory.trc",'a')
## handler = logging.StreamHandler(sys.stderr)
logger.addHandler(handler)
formatter = logging.Formatter("%(name)s %(asctime)s %(filename)s
%(lineno)d %(levelname)s %(message)s")
handler.setFormatter(formatter)
logger.setLevel(2)

fileName = "history.xml"
output = 'history.csv'
logger.info('Xml history generator version %s',versionStr)
logger.info('Starting history generation on file:%s',fileName)

packages = []
data = []

## Start XML processing

dataSource = parse(fileName)
print dataSource.documentElement.tagName
listCsomag = dataSource.getElementsByTagName("csomag")
size = listCsomag.length
logger.debug('Number of packages = %d',size)
for idx in xrange(size):
    attrib = ""
    package = None
    serial = 0
    date = ""
    owner = ""
    schema = ""
    flag = False
    logger.info('Parsing package id=%d',idx)
    attrib = getItem(logger, listCsomag.item(idx),'sorszam')
    if attrib <> "NUM" and attrib <> -1:
        serial = int(attrib)
        flag = True
        logger.debug('Package serial set to %d',serial)
    else:
        logger.debug("Template package found.")
        break
    attrib = ""
    attrib = getItem(logger,listCsomag.item(idx),"datum")
    if attrib <> -1:
        date = attrib
        flag = flag and True
        logger.debug('Package date set to %s',date)
    attrib = ""
    attrib = getItem(logger,listCsomag.item(idx),"ki")
    if attrib <> -1:
        owner = attrib
        flag = flag and True
        logger.debug('Package owner set to %s',owner)
    attrib = ""
    attrib = getItem(logger,listCsomag.item(idx),"sema")
    if attrib <> -1:
        schema = attrib
        flag = flag and True
        logger.debug('Package schema set to %s',schema)

    if flag <> True:
        logger.error('Package id=%d is inconsistent',idx)
        break
    else:
        logger.info('Package id=%d is ok',idx)

    package = Package(serial,date,owner,schema)

    listItem = listCsomag.item(idx).getElementsByTagName("item")
    itemSize = listItem.length
    logger.debug('Number of items = %d',itemSize)
    for num in xrange(itemSize):
        flag = False
        value = -1
        listId = 0
        change = ""
        comment = ""
        item = None
        logger.info('Parsing item id = %d',num)
        value = getItem(logger,listItem.item(num),"item_id")
        if value <> -1:
            listId = int(value)
            flag = True
            logger.debug('List id set to %d',listId)
        value = ""
        value = getItem(logger,listItem.item(num),"valtozas")
        if value <> -1:
            change = value
            flag = flag and True
            logger.debug('List change desc. set to "%s"',change)
        value = ""
        value = getItem(logger,listItem.item(num),"komment")
        if value <> -1:
            comment = value
            flag = flag and True
            logger.debug('List comment desc. set to "%s"',comment)

        if flag <> True:
            logger.error('Item id = %d inconsistent',num)
            break
        else:
            logger.info('Item id = %d is ok',num)

        item = Item(listId,change,comment)
        package.insertItem(item)

    packages.append(Package)

logger.info('Processing Xml file %s is done',fileName)
logger.info('Generating file %s is started',output)

size = len(packages)
package = None
for index in xrange(size):
    logger.info('PrettyPrinting package id=%d',index)
    oplines = []
    oplines = packages[index].printPackage()
    for i in xrange(oplines.length):
        data.append(oplines[i])

print data

-- 
Linux: Choice of a GNU Generation


From gh at ghaering.de  Mon Mar  1 15:59:53 2010
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Mon, 01 Mar 2010 21:59:53 +0100
Subject: Building Python with Scons
Message-ID: <hmh9s9$nm8$1@dough.gmane.org>

I'm setting up a third-party library project (similar to the one in 
Google Chromium) where I use SCons as build tool.

Now I need to integrate Python, too. Has anybody written a Scons script 
for Python 2.x or 3.x, yet?

-- Gerhard



From philip at semanchuk.com  Mon Mar  1 16:02:48 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Mon, 1 Mar 2010 16:02:48 -0500
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <7x635fdcth.fsf@ruckus.brouhaha.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org>
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
Message-ID: <7E76CFE6-DBEA-491C-B636-338D378672C4@semanchuk.com>


On Mar 1, 2010, at 3:08 PM, Paul Rubin wrote:

> Patrick Maupin <pmaupin at gmail.com> writes:
>> One of my complaints.  If you had read the document you would have
>> seen others.  I actually have several complaints about YAML, but I
>> tried to write a cogent summary.
>
> Yaml sucks, but seems to have gotten some traction regardless.
> Therefore the Python principle of "there should be one and only one
> obvious way to do it" says: don't try to replace the existing thing if
> your new thing is only slightly better.  Just deal with the existing
> thing's imperfections or make improvements to it.  If you can make a
> really powerful case that your new thing is 1000x better than the old
> thing, that's different, but I don't think we're seeing that here.
>
> Also, XML is used for pretty much everything in the Java world.  It
> sucks too, but it is highly standardized, it observably gets the job
> done, there are tons of structure editors for it, etc.  Frankly
> I'd rather have stayed with it than deal with Yaml.
>
> There are too many of these damn formats.  We should ban all but one  
> of
> them (I don't much care which one).  And making even more of them is  
> not
> the answer.


I dunno, times change, needs change. We must invent new tools, be  
those computer languages or data formats. Otherwise we'd still be  
programming in COBOL and writing fixed-length records to 12 inch  
floppies.*

If Mr. Maupin was a giant corporation trying to shove a proprietary  
format down our collective throats, I might object to RSON. But he's  
not. He appears willing for it live or die on its merits, so I say  
good luck to him. I don't want or need it, but someone else might.

Cheers
Philip


* You had floppies? Bleddy luxury! We wrote our data on wood pulp we'd  
chewed ourselves and dried into paper, using drops of our own blood to  
represent 1s and 0s.



From breamoreboy at yahoo.co.uk  Mon Mar  1 16:09:39 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Mon, 01 Mar 2010 21:09:39 +0000
Subject: Docstrings considered too complicated
In-Reply-To: <20100301212954.7aa0b99d@geekmail.INVALID>
References: <20100224212303.242222c6@geekmail.INVALID>	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>	<20100227191040.6c77f2d8@geekmail.INVALID>	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>	<20100301140943.4edca16b@geekmail.INVALID>	<4b8be8f7$1@dnews.tpgi.com.au>	<20100301182255.3de59bc6@geekmail.INVALID>	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
Message-ID: <hmhadv$q4i$1@dough.gmane.org>

Andreas Waldenburger wrote:
> On Mon, 01 Mar 2010 18:42:17 +0100 Jean-Michel Pichavant
> <jeanmichel at sequans.com> wrote:
> 
>> Andreas Waldenburger wrote:
>> [snip]
>>> Back in the software world: Those guys write code that works. It
>>> does what it's supposed to do. Why should we care where they put
>>> their comments?
>>>
>>>   
>> If you've bought the code and want to maintain it, you'd better make 
>> sure it's possible.
>>
> Fair enough, but we don't want to maintain it.
> 
> 
>> By the way, the ISO 9001 standard ask for your out sourced processing
>> to be compliant with your QA objectives, so if you care about your
>> code, then you should care for the code you buy.
>>
> We did not buy code. If it were written in C or such, we would never
> get to see it.
> 
> It's not our concern.
> 
> /W
> 

 From your original post.

<quote>
a company that works with my company writes a lot of of their code in
Python (lucky jerks). I've seen their code and it basically looks like
this:
</quote>

So what is the relationship between your company and this other company?
When it gets down to pounds, shillings and pence (gosh, I'm old!:) it 
sure as hell could make a tremendous difference in the long term, given 
that usually maintainance costs are astronomical when compared to 
initial development costs.

Regards.

Mark Lawrence.



From pmaupin at gmail.com  Mon Mar  1 16:11:59 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 13:11:59 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org> 
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com> 
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
	<2804c8c0-ffe5-4dde-b076-3e0948c32021@g11g2000yqe.googlegroups.com>
	<7xwrxv4vv7.fsf@ruckus.brouhaha.com>
Message-ID: <0417d443-2013-4f62-9158-b684e3be779c@u9g2000yqb.googlegroups.com>

On Mar 1, 2:42?pm, Paul Rubin <no.em... at nospam.invalid> wrote:
> Patrick Maupin <pmau... at gmail.com> writes:
> > But for my use-case, YAML is irretrievably broken. ?Sure, it looks
> > reasonably nice, but it increases regression runtime unacceptably.
>
> How big are the files that you want to parse with it? ?Sheesh.

Tiny, but over and over.  The rst2pdf testsuite can generate
approximately 160 PDFs, totalling around 2.5 MB, in around 22 seconds
on one of my machines.  But if I replace the JSON parser with a YAML
parser, that goes up to 55 seconds.  Wait, maybe it's because JSON is
optimized in C!  Nope, using JSON but disabling the C scanner only
takes it to 22.3 seconds...

>
> > Well, I've looked at the YAML parser and I can assure you that I will
> > not be contributing to that project.
>
> So write a new one that parses the same syntax, but cleaner and faster.

But there are already several parsers for YAML, and none of them
agree!  The syntax definition is a mess.  The thing's been in
development for 10 years now, and there is no one true way to do it.
Seriously, YAML overreaches for what I want.

> > XML can certainly be made readable by humans. ?It's hard to make it
> > writeable by (average) humans just using a regular text editor,
>
> I do it all the time; it's a bit dreary but not difficult. ?And there is
> absolutely no way to get anything done in this field anymore without
> dealing with XML from time to time. ?So given that we all have some
> experience using it, it's sensible to stick with it.

But people "in this field" are not really my target audience.  Well, I
mean people in this field are the target audience for the library, but
not for the writing of the actual text files.

> ReST is another abomination that should never have gotten off the
> ground. ?It is one of the reasons I react so negatively to your
> config format proposal. ?It just sounds like more of the same.

Well, that clarifies a lot.  I guess we'll just have to agree to
disagree :-)

Regards,
Pat


From alfps at start.no  Mon Mar  1 16:16:59 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Mon, 01 Mar 2010 22:16:59 +0100
Subject: How to crash CPython 3.1.1 in Windows XP
Message-ID: <hmhasc$epk$1@news.eternal-september.org>

How to crash CPython 3.1.1 in Windows XP:

   python -c "import os; os.spawnl( os.P_WAIT, 'blah' )"

I reported this as a bug, <url: http://bugs.python.org/issue8036>

Workaround: it seems that spawnl is happy with an absolute path as second arg, 
followed by a third arg which should be the name of the program (repeated).


Cheers,

- Alf


From __peter__ at web.de  Mon Mar  1 17:12:33 2010
From: __peter__ at web.de (Peter Otten)
Date: Mon, 01 Mar 2010 23:12:33 +0100
Subject: Class attributes / methods..... full Python script
References: <mailman.75.1267476839.23598.python-list@python.org>
Message-ID: <hmhe3m$l7j$03$1@news.t-online.com>

Gabor Urban wrote:

> thanks for the ideas. Here you are the code. Not transcoded from Java
> for I do not know Java enough..
> 
> I am scanning an XML file, and have a large ammount of logging.
> 
> Any ideas are wellcome as before....
> 
> Thnx
> 
> Code:>

>     packages.append(Package)

Replace Package (the class) with package (an instance).

> for i in xrange(oplines.length):
>     data.append(oplines[i])

Python lists don't have a length attribute. You can determine their length 
with len(oplines). To iterate over the items of a list you need not know the 
list's length:

for line in oplines:
    data.append(line)

which can be simplified to

data.extend(oplines)

Peter

PS: Rrread the tutorial


From emile at fenx.com  Mon Mar  1 17:12:56 2010
From: emile at fenx.com (Emile van Sebille)
Date: Mon, 01 Mar 2010 14:12:56 -0800
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <7E76CFE6-DBEA-491C-B636-338D378672C4@semanchuk.com>
References: <mailman.34.1267409372.23598.python-list@python.org>	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<mailman.64.1267463648.23598.python-list@python.org>	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>	<7xljebyl56.fsf@ruckus.brouhaha.com>	<mailman.70.1267468806.23598.python-list@python.org>	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>	<7xhbozrfy4.fsf@ruckus.brouhaha.com>	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>	<7x635fdcth.fsf@ruckus.brouhaha.com>
	<7E76CFE6-DBEA-491C-B636-338D378672C4@semanchuk.com>
Message-ID: <hmhe1d$728$1@dough.gmane.org>

On 3/1/2010 1:02 PM Philip Semanchuk said...
> * You had floppies? Bleddy luxury! We wrote our data on wood pulp we'd
> chewed ourselves and dried into paper, using drops of our own blood to
> represent 1s and 0s.

You had left-over blood?!!

Emile :)



From python at mrabarnett.plus.com  Mon Mar  1 17:31:02 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Mon, 01 Mar 2010 22:31:02 +0000
Subject: Class attributes / methods..... full Python script
In-Reply-To: <f7ac28aa1003011253s1c11acf2j243aa0277e57082e@mail.gmail.com>
References: <f7ac28aa1003011253s1c11acf2j243aa0277e57082e@mail.gmail.com>
Message-ID: <4B8C4026.3010907@mrabarnett.plus.com>

Gabor Urban wrote:
> Hi guys,
> 
> thanks for the ideas. Here you are the code. Not transcoded from Java
> for I do not know Java enough..
> 
> I am scanning an XML file, and have a large ammount of logging.
> 
> Any ideas are wellcome as before....
> 
> Thnx
> 
> Code:>
> 
> #---------------------------------------------
> ## Generate CSV from OEP History XML
> #---------------------------------------------
> 
> import sys
> import os
> from xml.dom.minidom import parse, parseString
> import xml.dom
> import logging
> 
> versionStr = '0.01'
> 
> class Item:
>     def __init__(self, pId, pChange, pComment):
>         self.ID = pId
>         self.Delta = pChange
>         self.Comment = pComment
> 
>     def PrintItem(self):
>         str = '%s,%s,%s'%(self.ID,self.Delta,self.comment)
>         return str
> 
> class Package:
>     def __init__(self, pSerial, pDate, pOwner, pSchema):
>         self.serial = pSerial
>         self.date = pDate
>         self.owner = pOwner
>         self.schema = pSchema
>         self.items = []
> 
>     def insertItem(self, pItem):
>         self.items.append(pItem)
> 
>     def printPackage(self):
>         lines = []
>         str = '%s,%s,%s,%s'%(self.serial,self.date,self.owner,self.schema)
>         number = self.items.length

If this is meant to get the length of self.items, then it won't work. It
should be:

         number = len(self.items)

>         for idx in xrange(number):
>             line = ''

What's the purpose of this line? You're not using 'line' before you
assign to it again.

>             istr = self.items[idx].PrintItem()
>             line = str + ',' + istr
>             lines.append(line)
>         return lines
> 
> def getItem(tracer, pkgItem, itemName):
>     retval = -1
>     name = ""
>     found = 0
>     str = ""
>     tracer.info('Function getItem entry, name = %s',itemName)
>     nItem = pkgItem.getElementsByTagName(itemName).item(0)
>     for node in pkgItem.childNodes:
>         if node.nodeType != xml.dom.Node.TEXT_NODE:
>             tracer.debug('Scanning node name = %s',node.nodeName)
>             if node.nodeName == itemName:
>                 tracer.debug('Pkg %s found',itemName)
>             else:
>                 tracer.warning('Pkg %s is not found',itemName)
>                 continue
>             for entity in node.childNodes:
>                 if entity.nodeType == xml.dom.Node.TEXT_NODE:
>                     retval = entity.nodeValue
>                     tracer.debug("Node value found %s",retval)
>                     found = 1
>                     break
>         if found == 1:
>             break
>     tracer.debug('Function getItem returns %s',retval)
>     return retval
> 
> logger = logging.getLogger('XmlHistory')
> handler = logging.FileHandler("Xmlhistory.trc",'a')
> ## handler = logging.StreamHandler(sys.stderr)
> logger.addHandler(handler)
> formatter = logging.Formatter("%(name)s %(asctime)s %(filename)s
> %(lineno)d %(levelname)s %(message)s")
> handler.setFormatter(formatter)
> logger.setLevel(2)
> 
> fileName = "history.xml"
> output = 'history.csv'
> logger.info('Xml history generator version %s',versionStr)
> logger.info('Starting history generation on file:%s',fileName)
> 
> packages = []
> data = []
> 
> ## Start XML processing
> 
> dataSource = parse(fileName)
> print dataSource.documentElement.tagName
> listCsomag = dataSource.getElementsByTagName("csomag")
> size = listCsomag.length
> logger.debug('Number of packages = %d',size)
> for idx in xrange(size):
>     attrib = ""
>     package = None
>     serial = 0
>     date = ""
>     owner = ""
>     schema = ""
>     flag = False
>     logger.info('Parsing package id=%d',idx)
>     attrib = getItem(logger, listCsomag.item(idx),'sorszam')
>     if attrib <> "NUM" and attrib <> -1:
>         serial = int(attrib)
>         flag = True
>         logger.debug('Package serial set to %d',serial)
>     else:
>         logger.debug("Template package found.")
>         break
>     attrib = ""

What's the purpose of this line? You're not using 'attrib' before you
assign to it again. You're doing this repeatedly in the code.

>     attrib = getItem(logger,listCsomag.item(idx),"datum")
>     if attrib <> -1:
>         date = attrib
>         flag = flag and True

Whether 'flag' is False or True, this line won't change it. You're also
doing this repeatedly in the code.

>         logger.debug('Package date set to %s',date)
>     attrib = ""
>     attrib = getItem(logger,listCsomag.item(idx),"ki")
>     if attrib <> -1:
>         owner = attrib
>         flag = flag and True
>         logger.debug('Package owner set to %s',owner)
>     attrib = ""
>     attrib = getItem(logger,listCsomag.item(idx),"sema")
>     if attrib <> -1:
>         schema = attrib
>         flag = flag and True
>         logger.debug('Package schema set to %s',schema)
> 
>     if flag <> True:

Clearer as:

     if not flag:

or even clearer if you picked a better name than 'flag'.

>         logger.error('Package id=%d is inconsistent',idx)
>         break
>     else:
>         logger.info('Package id=%d is ok',idx)
> 
>     package = Package(serial,date,owner,schema)
> 
>     listItem = listCsomag.item(idx).getElementsByTagName("item")
>     itemSize = listItem.length
>     logger.debug('Number of items = %d',itemSize)
>     for num in xrange(itemSize):
>         flag = False
>         value = -1
>         listId = 0
>         change = ""
>         comment = ""
>         item = None
>         logger.info('Parsing item id = %d',num)
>         value = getItem(logger,listItem.item(num),"item_id")
>         if value <> -1:
>             listId = int(value)
>             flag = True
>             logger.debug('List id set to %d',listId)
>         value = ""
>         value = getItem(logger,listItem.item(num),"valtozas")
>         if value <> -1:
>             change = value
>             flag = flag and True
>             logger.debug('List change desc. set to "%s"',change)
>         value = ""
>         value = getItem(logger,listItem.item(num),"komment")
>         if value <> -1:
>             comment = value
>             flag = flag and True
>             logger.debug('List comment desc. set to "%s"',comment)
> 
>         if flag <> True:
>             logger.error('Item id = %d inconsistent',num)
>             break
>         else:
>             logger.info('Item id = %d is ok',num)
> 
>         item = Item(listId,change,comment)
>         package.insertItem(item)
> 
>     packages.append(Package)
> 
The instance is 'package', the class is 'Package'. You're using the
wrong one.

> logger.info('Processing Xml file %s is done',fileName)
> logger.info('Generating file %s is started',output)
> 
> size = len(packages)
> package = None
> for index in xrange(size):
>     logger.info('PrettyPrinting package id=%d',index)
>     oplines = []
>     oplines = packages[index].printPackage()
>     for i in xrange(oplines.length):

The length of a list, string, etc, is given by 'len', eg. len(oplines).

>         data.append(oplines[i])
> 
> print data
> 



From ben+python at benfinney.id.au  Mon Mar  1 17:48:47 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Tue, 02 Mar 2010 09:48:47 +1100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
Message-ID: <87eik3zmi8.fsf@benfinney.id.au>

Andreas Waldenburger <usenot at geekmail.INVALID> writes:

> On Mon, 01 Mar 2010 18:42:17 +0100 Jean-Michel Pichavant
> <jeanmichel at sequans.com> wrote:
>
> > Andreas Waldenburger wrote:
> > [snip]
> > > Back in the software world: Those guys write code that works. It
> > > does what it's supposed to do. Why should we care where they put
> > > their comments?
> > >   
> > If you've bought the code and want to maintain it, you'd better make
> > sure it's possible.
> > 
> Fair enough, but we don't want to maintain it.

Do you want it maintained beyond the span of your agreement with the
current developers? Do you want to have free choice in who will maintain
it over the period that you need it maintained?

I understood ?want to maintain it? in Jean-Michel's message to include
the possibility to get someone else to maintain it on your terms.

> It's not our concern.

Then I don't see what that problem is.

-- 
 \     ?To save the world requires faith and courage: faith in reason, |
  `\            and courage to proclaim what reason shows to be true.? |
_o__)                                                ?Bertrand Russell |
Ben Finney


From jon.sneyers at gmail.com  Mon Mar  1 17:55:44 2010
From: jon.sneyers at gmail.com (Jon Sneyers)
Date: 1 Mar 2010 14:55:44 -0800
Subject: Call for Participation: CHR Summer School
Message-ID: <8331b2f8-c9b7-4d23-923a-06e52cd75e19@z35g2000yqd.googlegroups.com>



- Call for Participation -


First International Summer School on CHR:
Programming and Reasoning with Rules and Constraints

August 30 - September 3 2010
Leuven, Belgium

Website:   http://www.cs.kuleuven.be/~dtai/CHR/summerschool

****************************************************************************
* EARLY REGISTRATION DISCOUNT: When registering (including payment) before *
*               March 31, the registration fee will be reduced by 20 euro! *
*
*
* Additional early registration incentive:                                 *
* The first 7 registrants get a FREE copy of the book                      *
*     "Constraint Handling Rules - Current Research Topics"                *
****************************************************************************


The aim of the summer school is to familiarize the participants with
state-of-the-art high-level declarative programming with rules and
constraints as well as providing insights into the analysis of programs
based on these concepts. The courses cover a wide range from theory to
practice.

The summer school will be based on the advanced high-level rule-based
formalism and programming language Constraint Handling Rules (CHR)
http://constraint-handling-rules.org/



Intended Audience:

The summer school provides courses at various levels. It is open to
anyone interested. It aims at Phd. students, but also post-docs,
interested researchers and master students as well as interested parties
from industry. Besides a working knowledge of English, there are no
prerequisites. A basic knowledge of logic and Prolog that is usually
covered in undergraduate classes could be helpful.


Lectures and Courses:

The programming language CHR will be introduced by several lecturers
on the first day of the summer school.

- Slim Abdennadher, GUC, Egypt
        Analysis of CHR Solvers
- Henning Christiansen, U. Roskilde, Denmark
        Abduction and language processing with CHR
- Thom Fruehwirth, University Ulm, Germany
        CHR - a common platform for rule-based approaches
- Jon Sneyers, K.U.Leuven, Belgium
        Computability and Complexity of CHR
- Peter Van Weert, K.U.Leuven, Belgium
        Implementation of CHR Systems

A final evaluation for each course is possible through a final exam or
project as determined by the instructor. The daily schedule admits
laboratory, recitation or working group activities to be organized in
addition to lectures.


Registration:

The registration fee for the School is 300 euro and includes teaching material
with book, as well as accomodation and coffee breaks. Meals are not included.
Attendance is limited to 20 students and will be allocated on a first-come-
first-served basis. Without accommodation the registration fee is reduced to
200 euro.


Location:

Leuven is a lively student town in Belgium with a very high density of
pubs offering hundreds of types of local beers.


Organization:

Thom Fruehwirth, University of Ulm, Germany
Jon Sneyers, K.U. Leuven, Belgium
Peter Van Weert, K.U. Leuven, Belgium


-- 

Looking for an H-912 (container).



From g.bogle at auckland.no.spam.ac.nz  Mon Mar  1 18:04:02 2010
From: g.bogle at auckland.no.spam.ac.nz (Gib Bogle)
Date: Tue, 02 Mar 2010 12:04:02 +1300
Subject: PyQt4.7 and PyQwt5.2.0
References: <hmemdg$oo7$1@speranza.aioe.org>
Message-ID: <hmhh53$jqi$1@speranza.aioe.org>

Gib Bogle wrote:
> I installed the latest PyQt (4.7-1), then PyQwt 5.2.0, which was built 
> with PyQt4.5.4.  This line
> 
> import PyQt4.Qwt5 as Qwt
> 
> fails to load the DLL.  Could this be the result of not using PyQt4 4.5.4?

I guess I can answer my own question.  As far as I can determine, PyQwt 5.2.0 
needs PyQt 4.5.4 to work.


From rhodri at wildebst.demon.co.uk  Mon Mar  1 18:06:27 2010
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Mon, 01 Mar 2010 23:06:27 -0000
Subject: Variable definition
References: <4B885A0B.9040705@netplus.ch> <4B887224.2080805@optimum.net>
	<mailman.69.1267466847.23598.python-list@python.org>
Message-ID: <op.u8wvs1kxa8ncjz@gnudebst>

On Mon, 01 Mar 2010 18:07:17 -0000, Raphael Mayoraz <maygeo at netplus.ch>  
wrote:

> Thanks for your answer.
> However, your solution changes the key name in the dictionary.
> That's not what I want I need to do. What I want is to define a new
> variable which name is define as a string: 'myPrefx' + key. In the  
> example
> I give, I would get 3 variables:
> myPrefixred = a
> myPrefixgreen = b
> myPrefixblue = c

I repeat my previous question: why?  What problem do you think this will  
solve that will not be more easily solved working with the language rather  
than against it?

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


From max at alcyone.com  Mon Mar  1 18:30:55 2010
From: max at alcyone.com (Erik Max Francis)
Date: Mon, 01 Mar 2010 15:30:55 -0800
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <mailman.70.1267468806.23598.python-list@python.org>
References: <mailman.34.1267409372.23598.python-list@python.org>	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<mailman.64.1267463648.23598.python-list@python.org>	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org>
Message-ID: <mb-dnbrp-4St0xHWnZ2dnUVZ_u5i4p2d@giganews.com>

Daniel Fetchinson wrote:
>>> it is my goal (which I may or may not be smart enough to reach) to
>>> write a module that anybody would want to use;
>> But you are working on a solution in search of a problem.  The really
>> smart thing to do would be pick something more useful to work on.  We
>> don't need another configuration language.  I can't even say "yet
>> another" because there's already a "yet another" called yaml.
> 
> And in case you are new here let me assure you that Paul is saying
> this with his full intention of being helpful to you. I also would
> think that working on such a project might be fun and educational for
> you but completely useless if you have users other than yourself in
> mind. Again, I'm trying to be helpful here, so you can focus on a
> project that is both fun/educational for you and also potentially
> useful for others. This RSON business is not one of them.

Agreed.  Even YAML's acronym indicates that it is already a bridge too 
far; we don't need more.

-- 
Erik Max Francis && max at alcyone.com && http://www.alcyone.com/max/
  San Jose, CA, USA && 37 18 N 121 57 W && AIM/Y!M/Skype erikmaxfrancis
   It's better to be quotable than to be honest.
    -- Tom Stoppard


From max at alcyone.com  Mon Mar  1 18:33:08 2010
From: max at alcyone.com (Erik Max Francis)
Date: Mon, 01 Mar 2010 15:33:08 -0800
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <466b86b0-a115-4871-b17c-b16d7d74fce0@y17g2000yqd.googlegroups.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<466b86b0-a115-4871-b17c-b16d7d74fce0@y17g2000yqd.googlegroups.com>
Message-ID: <mb-dnbXp-4Qp0xHWnZ2dnUVZ_u5i4p2d@giganews.com>

Patrick Maupin wrote:
> On Mar 1, 12:03 pm, Paul Rubin <no.em... at nospam.invalid> wrote:
> 
>> But you are working on a solution in search of a problem.  The really
>> smart thing to do would be pick something more useful to work on.  We
>> don't need another configuration language.  I can't even say "yet
>> another" because there's already a "yet another" called yaml.
> 
> The only "in search of" here is that, instead of working on a point
> solution for my particular problem, I am "in search of" a solution
> that is a bit more elegant and general, and that might help solve
> other people's problems too.  If you are not one of those that has
> this sort of problem at this point in time, then feel free to kill-
> file this thread.

Psst.  That you're allowed to present the idea that you think is good 
doesn't mean that other people aren't allowed to respond and point out 
that in their opinion it's not such a good idea.  You don't own this or 
any other thread.

-- 
Erik Max Francis && max at alcyone.com && http://www.alcyone.com/max/
  San Jose, CA, USA && 37 18 N 121 57 W && AIM/Y!M/Skype erikmaxfrancis
   It's better to be quotable than to be honest.
    -- Tom Stoppard


From max at alcyone.com  Mon Mar  1 18:57:42 2010
From: max at alcyone.com (Erik Max Francis)
Date: Mon, 01 Mar 2010 15:57:42 -0800
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
Message-ID: <scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>

Patrick Maupin wrote:
> On Feb 28, 9:18 pm, Steven D'Aprano > Wait a minute... if JSON is too
> hard to edit, and RSON is a *superset* of
>> JSON, that means by definition every JSON file is also a valid RSON file.
>> Since JSON is too hard to manually edit, so is RSON.
> 
> Well, Python is essentially a superset of JSON, with string escape
> handling being ever so slightly different, and using True instead of
> true, False instead of false, and None instead of null.  YMMV, but I
> find it possible, even probable, to write Python that is far easier to
> edit than JSON, and in fact, I have used Python for configuration
> files that are only to be edited by programmers or other technical
> types.

This not only seriously stretching the meaning of the term "superset" 
(as Python is most definitely not even remotely a superset of JSON), but 
still doesn't address the question.  Is RSON and _actual_ superset of 
JSON, or are you just misusing the term there, as well?  If it is, then 
your rationale for not using JSON makes no sense if you're making a new 
format that's merely a superset of it.  Obviously JSON can't be that 
unreadable if you're _extending_ it to make your own "more readable" 
format.  If JSON is unreadable, so must be RSON.

-- 
Erik Max Francis && max at alcyone.com && http://www.alcyone.com/max/
  San Jose, CA, USA && 37 18 N 121 57 W && AIM/Y!M/Skype erikmaxfrancis
   It's better to be quotable than to be honest.
    -- Tom Stoppard


From massimodipierro71 at gmail.com  Mon Mar  1 19:20:06 2010
From: massimodipierro71 at gmail.com (mdipierro)
Date: Mon, 1 Mar 2010 16:20:06 -0800 (PST)
Subject: taking python enterprise level?...
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com> 
	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>
Message-ID: <778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>

On Mar 1, 6:32?am, simn_stv <nany... at googlemail.com> wrote:
...
>
> > You have to follow some tricks:
>
> > 1) have the web server serve static pages directly and set the pragma
> > cache expire to one month
> > 2) cache all pages that do not have forms for at least few minutes
> > 3) avoid database joins
>
> but this would probably be to the detriment of my database design,
> which is a no-no as far as im concerned. The way the tables would be
> structured requires 'joins' when querying the db; or could you
> elaborate a little??

Joins are the bottle neck of most web app that relay on relational
databases. That is why non-relational databases such as Google App
Engine, CouchDB, MongoDB do not even support Joins. You have to try to
minimize joins as much as possible by using tricks such as de-
normalization and caching.

> > 4) use a server with at least 512KB Ram.
>
> hmmm...!, still thinking about what you mean by this statement also.

I meant 512MB. The point is you need a lot of ram because you want to
run multiple python instances, cache in ram as much as possible and
also allow the database to buffer in ram as much as possible. You will
see Ram usage tends to spike when you have lots of concurrent
requests.



From misceverything at gmail.com  Mon Mar  1 19:41:57 2010
From: misceverything at gmail.com (T)
Date: Mon, 1 Mar 2010 16:41:57 -0800 (PST)
Subject: Py2exe - Bad File Descriptor
References: <0c04902d-03e8-4b0e-8dd3-3bbdf7ea09b6@z11g2000yqz.googlegroups.com>
	<mailman.26.1267390207.23598.python-list@python.org>
	<c13e8eec-0cf0-4ec5-88af-87baaed039b3@g10g2000yqh.googlegroups.com>
	<mailman.37.1267412421.23598.python-list@python.org>
Message-ID: <b3562288-9191-4260-ac07-38eeabe93af7@o30g2000yqb.googlegroups.com>

On Feb 28, 10:00?pm, Dennis Lee Bieber <wlfr... at ix.netcom.com> wrote:
> On Sun, 28 Feb 2010 13:22:19 -0800 (PST), T <misceveryth... at gmail.com>
> declaimed the following in gmane.comp.python.general:
>
> > Sorry for the lack of code - yes, it does try to write to the
> > console. ?From what I'm finding, this error may be due to the fact
> > that there is no "console" to write to when I'm logged off. ?However,
> > I would like to be able to print to screen if I run the EXE in debug
> > mode (i.e. "myservice.exe debug"). ?Do you know of any way around
> > this? ?Also, I need to get the output generated from an external EXE -
> > will subprocess.Popen cause problems if I use stdout=PIPE? ?Thanks for
> > your help!
>
> ? ? ? ? True services typically don't have interactive (console) type I/O...
> What is more likely to work is to have an open socket waiting for
> connections, and the use of a separate user-space client that connects
> to the socket...
> --
> ? ? ? ? Wulfraed ? ? ? ? Dennis Lee Bieber ? ? ? ? ? ? ? KD6MOG
> ? ? ? ? wlfr... at ix.netcom.com ? ? ?HTTP://wlfraed.home.netcom.com/

So how would that work..would the program buffer all the "print"
output, then send it to the client when it connects?  Do you happen to
know of any available code that utilizes this method, or something
similar?  Thanks for your help.


From pmaupin at gmail.com  Mon Mar  1 19:45:07 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 16:45:07 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<466b86b0-a115-4871-b17c-b16d7d74fce0@y17g2000yqd.googlegroups.com>
	<mb-dnbXp-4Qp0xHWnZ2dnUVZ_u5i4p2d@giganews.com>
Message-ID: <2e244da6-7fdc-48a2-acd4-c8861c5d7c2f@q16g2000yqq.googlegroups.com>

On Mar 1, 5:33?pm, Erik Max Francis <m... at alcyone.com> wrote:
> Psst. ?That you're allowed to present the idea that you think is good
> doesn't mean that other people aren't allowed to respond and point out
> that in their opinion it's not such a good idea. ?You don't own this or
> any other thread.

Absolutely, but I still do (and will always) express a clear
preference for opinions that have at least a modicum of reasoning
behind them.

Regards,
Pat


From pmaupin at gmail.com  Mon Mar  1 19:56:46 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 16:56:46 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
Message-ID: <4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>

On Mar 1, 5:57?pm, Erik Max Francis <m... at alcyone.com> wrote:
> Patrick Maupin wrote:
> This not only seriously stretching the meaning of the term "superset"
> (as Python is most definitely not even remotely a superset of JSON), but

Well, you are entitled to that opinion, but seriously, if I take valid
JSON, replace unquoted true with True, unquoted false with False,
replace unquoted null with None, and take the quoted strings and
replace occurrences of \uXXXX with the appropriate unicode, then I do,
in fact, have valid Python.  But don't take my word for it -- try it
out!

But if you really want to be pedantic about it, JavaScript (rather
than Python) is, in fact a superset of JSON, and, despite the
disparagement JavaScript receives, in my opinion, it is possible to
write much better looking JavaScript than JSON for many tasks.

YAML, also, is a superset of JSON, and IMO, it is possible to write
much better looking YAML than JSON.

> still doesn't address the question. ?Is RSON and _actual_ superset of
> JSON, or are you just misusing the term there, as well?

Yes, the RSON definition, in fact, a superset of JSON, just like the
YAML definition.  But RSON is a much smaller grammar than YAML.

 ?If it is, then
> your rationale for not using JSON makes no sense if you're making a new
> format that's merely a superset of it. ?Obviously JSON can't be that
> unreadable if you're _extending_ it to make your own "more readable"
> format. ?If JSON is unreadable, so must be RSON.

Well, we'll have to agree to disagree here.  Bearing in mind that the
definition of "unreadable" depends on the target application and user,
obviously, it will be *possible* to write unreadable RSON, just as it
is *possible* to write unreadable JavaScript or Python or YAML, but it
will be *possible* to write better looking RSON than is possible to
achieve with JSON, just as it is *possible* to write better looking
JavaScript or YAML or Python than it is *possible* to achieve with
pure JSON.

Best regards,
Pat


From jjposner at optimum.net  Mon Mar  1 20:07:37 2010
From: jjposner at optimum.net (John Posner)
Date: Mon, 01 Mar 2010 20:07:37 -0500
Subject: Method / Functions - What are the differences?
In-Reply-To: <4b8c2a34$0$10470$426a74cc@news.free.fr>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
Message-ID: <hmhobt$6rl$1@dough.gmane.org>

On 3/1/2010 2:59 PM, Bruno Desthuilliers wrote:

> Answer here:
>
> http://groups.google.com/group/comp.lang.python/tree/browse_frm/thread/bd71264b6022765c/3a77541bf9d6617d#doc_89d608d0854dada0
>
> I really have to put this in the wiki :-/


Bruno, I performed a light copy-edit of your writeup and put in some 
reStructuredText (reST) markup. The result is at:

   http://cl1p.net/bruno_0301.rst/

The only sentence that I think needs work is:

   Having access to itself (of course), the
   instance (if there's one) and the class, it's easy for it
   to wrap all this into a **method** object.

Maybe this?

   With the instance object (if any) and class object available,
   it's easy to create a method object that wraps the function object.


Begging pardon for my presumptuousness,
John



From xi at gamma.dn.ua  Mon Mar  1 20:07:39 2010
From: xi at gamma.dn.ua (Kirill Simonov)
Date: Mon, 01 Mar 2010 20:07:39 -0500
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <mb-dnbrp-4St0xHWnZ2dnUVZ_u5i4p2d@giganews.com>
References: <mailman.34.1267409372.23598.python-list@python.org>	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<mailman.64.1267463648.23598.python-list@python.org>	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>	<7xljebyl56.fsf@ruckus.brouhaha.com>	<mailman.70.1267468806.23598.python-list@python.org>
	<mb-dnbrp-4St0xHWnZ2dnUVZ_u5i4p2d@giganews.com>
Message-ID: <4B8C64DB.3010105@gamma.dn.ua>

Erik Max Francis wrote:
> Daniel Fetchinson wrote:
>>>> it is my goal (which I may or may not be smart enough to reach) to
>>>> write a module that anybody would want to use;
>>> But you are working on a solution in search of a problem.  The really
>>> smart thing to do would be pick something more useful to work on.  We
>>> don't need another configuration language.  I can't even say "yet
>>> another" because there's already a "yet another" called yaml.
>>
>> And in case you are new here let me assure you that Paul is saying
>> this with his full intention of being helpful to you. I also would
>> think that working on such a project might be fun and educational for
>> you but completely useless if you have users other than yourself in
>> mind. Again, I'm trying to be helpful here, so you can focus on a
>> project that is both fun/educational for you and also potentially
>> useful for others. This RSON business is not one of them.
> 
> Agreed.  Even YAML's acronym indicates that it is already a bridge too 
> far; we don't need more.
> 

Note that YA in the acronym doesn't mean Yet Another, YAML = YAML Ain't 
Markup Language.


Thanks,
Kirill


From roy at panix.com  Mon Mar  1 20:20:05 2010
From: roy at panix.com (Roy Smith)
Date: Mon, 01 Mar 2010 20:20:05 -0500
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<eq4l57-okf2.ln1@ozzie.tundraware.com>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <7uu1ooFiipU1@mid.individual.net>
	<4B89D8BE.2040905@mrabarnett.plus.com> <4B8B9845.70604@sequans.com>
	<mailman.59.1267456634.23598.python-list@python.org>
Message-ID: <roy-DEF860.20200401032010@news.panix.com>

In article <mailman.59.1267456634.23598.python-list at python.org>,
 MRAB <python at mrabarnett.plus.com> wrote:

> Ah, yes, Star Trek (the original series).
> 
> If they transported down to a planet and there was a man in a red shirt
> who you'd never seen before, he'd be the one to die! :-)

Of course.  Everybody knows there's an endless supply of red shirts.


From eman_no1 at yahoo.com  Mon Mar  1 20:47:44 2010
From: eman_no1 at yahoo.com (Eman)
Date: Mon, 1 Mar 2010 17:47:44 -0800 (PST)
Subject: How to use python to register a service (an existing .exe file)
References: <4b79e28c$0$4610$426a74cc@news.free.fr>
Message-ID: <881a0df5-872f-4c19-a989-fe3ffe775655@k2g2000pro.googlegroups.com>

On Feb 15, 4:10?pm, News123 <news... at free.fr> wrote:
> Hi,
>
> Is there a python way to register new windows services.
>
> I am aware of the
> instsrv.exe program, which can be used to install services.
> I could use subprocess.Popen to call
>
> instsrv.exe "service_name" program.exe
>
> but wondered, whether there's already an existing function.
>
> Thans in advance and bye
>
> N


Try my favorite 3rd pary tools maker, Chilkatsoft.com.
http://www.chilkatsoft.com/refdoc/pythonCkServiceRef.html

Eman_No1


From xi at gamma.dn.ua  Mon Mar  1 21:02:34 2010
From: xi at gamma.dn.ua (Kirill Simonov)
Date: Mon, 01 Mar 2010 21:02:34 -0500
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <d09829f51002281809w2d2e556ct841f5adaaf78a723@mail.gmail.com>
References: <d09829f51002281809w2d2e556ct841f5adaaf78a723@mail.gmail.com>
Message-ID: <4B8C71BA.9060106@gamma.dn.ua>

Patrick Maupin wrote:
> All:
> 
> Finding .ini configuration files too limiting, JSON and XML to hard to
> manually edit, and YAML too complex to parse quickly, I have started
> work on a new configuration file parser.

I'd like to note that with the optional libyaml bindings, the PyYAML 
parser is pretty fast.

> I call the new format RSON (for "Readable Serial Object Notation"),
> and it is designed to be a superset of JSON.
> 
> I would love for it to be considered valuable enough to be a part of
> the standard library, but even if that does not come to pass, I would
> be very interested in feedback to help me polish the specification,
> and then possibly help for implementation and testing.
> 
> The documentation is in rst PEP form, at:
> 
> http://rson.googlecode.com/svn/trunk/doc/draftpep.txt

=== cut ===
Because YAML does allow for highly readable configuration files, it
is tempting to overlook its other flaws for the task.  But a fully
(or almost) compliant parser has to understand the whole YAML
specification, and this is apparently expensive.  Running the rst2pdf
testsuite, without sphinx or most of the other optional packages, in
"fast" mode (preloading all the modules, and then forking for every
test) generates 161 smallish PDF files, totaling around 2.5 MB.  On
one test system this process takes 22 seconds.  Disabling the _json C
scanner and reading the configuration files using the json pure Python
implementation adds about 0.3 seconds to the 22 seconds.  But using
pyyaml v. 3.09 instead of json adds 33 seconds to the 22 second process!
It might seem that this is an edge case, but it makes it unacceptable to
use YAML for this sort of testing, and taking 200 ms to read in 1000
lines of simple JSON will be unacceptable in many other application
domains as well.
=== cut ===

I'd question your testing methodology.  From your description, it looks 
like the _json speedup never was enabled.  Also PyYAML provides optional 
bindings to libyaml, which makes parsing and emitting yaml much faster. 
  In my tests, it parses a 10Mb file in 3 sec.

=== cut ===
RSON semantics are based on JSON.  Like JSON, an RSON document represents
either a single scalar object, or a DAG (Directed Acyclic Graph), which
may contain only a few simple data types.
=== cut ===

JSON doesn't represent a DAG, at least, not an arbitrary DAG since each 
node in the document has no more than one parent.  It would be more 
accurate to say that that it represents a tree-like structure.

=== cut ===
The YAML syntax for supporting back-references was considered and deemed
unsatisfactory. A human user who wants to put identical information in a
"ship to" and "bill to" address is much more likely to use cut and paste
than he is to understand and use backreferences, so the additional overhead
of supporting more complex document structures is unwarranted.

The concept of a "merge" in YAML, where two sub-trees of data can be
merged together (similar to a recursive Python dictionary update)
is quite useful, though, and will be copied.  This does not alter the
outcome that parsing a RSON file will result in a DAG, but does give
more flexibility in the syntax that can be used to achieve a particular
output DAG.
=== cut ===

This paragraph assumes the reader is familiar with intricate details of 
the YAML grammar and semantics.  I bet most of your audience are 
completely lost here.

=== cut ===
Enhanced example::

     key1/key2a
         key3a = Some random string
         key3b = 42
     key1/key2a
         key3c
             1
             2
             {}
                 key4a = anything
                 key4b = something else
             []
                 a
                 b
                 c
             3
             4
     key1/key2b = [1, 2, 3, 4]
     key5 = ""
        This is a multi-line string.  It is
           dedented to the farthest left
           column that is indented from
           the line containing "".
     key6 = [""]
        This is an array of strings, one per line.
        Each string is dedented appropriately.
=== cut ===

Frankly, this is an example that only a mother could love.  I'd suggest 
you to add some real-world examples, make sure they look nice and put 
them to the introductory part of the document.  Examples is how the 
format will be evaluated by the readers, and yours don't stand a chance.

Seriously, the only reason YAML enjoys its moderate popularity despite 
its overcomplicated grammar, chronic lack of manpower and deficient 
implementations is because it's so cute.



Disclaimer: I'm the author of PyYAML and libyaml.

Thanks,
Kirill


From axpbgj at terra.com  Mon Mar  1 21:12:02 2010
From: axpbgj at terra.com (floatron)
Date: 01 Mar 2010 23:12:02 -0300
Subject: ze     Basta de cloro en su piscina
Message-ID: <20100301231202.1A5E8DBF4FBCD983@terra.com>

An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20100301/5954a905/attachment.html>

From pmaupin at gmail.com  Mon Mar  1 21:19:34 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 20:19:34 -0600
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <4B8C71BA.9060106@gamma.dn.ua>
References: <d09829f51002281809w2d2e556ct841f5adaaf78a723@mail.gmail.com>
	<4B8C71BA.9060106@gamma.dn.ua>
Message-ID: <d09829f51003011819p70287a31k9edde871066294ff@mail.gmail.com>

Kirill:

Thank you for your constructive criticism.  This is the gem that made
it worthwhile to post my document.  I think all of your points are
spot-on, and I will be fixing the documentation.

I can well believe that the C implementation of YAML is much faster
than the Python one, but I am aiming for something that will be
reasonably quick in pure Python.  I will double-check the JSON C test
results, but something I probably did not make clear is that the 22
seconds is not spent parsing -- that is for the entire test, which
involves reading restructured text and generating some 160 separate
PDF files.

Best regards,
Pat


On Mon, Mar 1, 2010 at 8:02 PM, Kirill Simonov <xi at gamma.dn.ua> wrote:
> Patrick Maupin wrote:
>>
>> All:
>>
>> Finding .ini configuration files too limiting, JSON and XML to hard to
>> manually edit, and YAML too complex to parse quickly, I have started
>> work on a new configuration file parser.
>
> I'd like to note that with the optional libyaml bindings, the PyYAML parser
> is pretty fast.
>
>> I call the new format RSON (for "Readable Serial Object Notation"),
>> and it is designed to be a superset of JSON.
>>
>> I would love for it to be considered valuable enough to be a part of
>> the standard library, but even if that does not come to pass, I would
>> be very interested in feedback to help me polish the specification,
>> and then possibly help for implementation and testing.
>>
>> The documentation is in rst PEP form, at:
>>
>> http://rson.googlecode.com/svn/trunk/doc/draftpep.txt
>
> === cut ===
> Because YAML does allow for highly readable configuration files, it
> is tempting to overlook its other flaws for the task. ?But a fully
> (or almost) compliant parser has to understand the whole YAML
> specification, and this is apparently expensive. ?Running the rst2pdf
> testsuite, without sphinx or most of the other optional packages, in
> "fast" mode (preloading all the modules, and then forking for every
> test) generates 161 smallish PDF files, totaling around 2.5 MB. ?On
> one test system this process takes 22 seconds. ?Disabling the _json C
> scanner and reading the configuration files using the json pure Python
> implementation adds about 0.3 seconds to the 22 seconds. ?But using
> pyyaml v. 3.09 instead of json adds 33 seconds to the 22 second process!
> It might seem that this is an edge case, but it makes it unacceptable to
> use YAML for this sort of testing, and taking 200 ms to read in 1000
> lines of simple JSON will be unacceptable in many other application
> domains as well.
> === cut ===
>
> I'd question your testing methodology. ?From your description, it looks like
> the _json speedup never was enabled. ?Also PyYAML provides optional bindings
> to libyaml, which makes parsing and emitting yaml much faster. ?In my tests,
> it parses a 10Mb file in 3 sec.
>
> === cut ===
> RSON semantics are based on JSON. ?Like JSON, an RSON document represents
> either a single scalar object, or a DAG (Directed Acyclic Graph), which
> may contain only a few simple data types.
> === cut ===
>
> JSON doesn't represent a DAG, at least, not an arbitrary DAG since each node
> in the document has no more than one parent. ?It would be more accurate to
> say that that it represents a tree-like structure.
>
> === cut ===
> The YAML syntax for supporting back-references was considered and deemed
> unsatisfactory. A human user who wants to put identical information in a
> "ship to" and "bill to" address is much more likely to use cut and paste
> than he is to understand and use backreferences, so the additional overhead
> of supporting more complex document structures is unwarranted.
>
> The concept of a "merge" in YAML, where two sub-trees of data can be
> merged together (similar to a recursive Python dictionary update)
> is quite useful, though, and will be copied. ?This does not alter the
> outcome that parsing a RSON file will result in a DAG, but does give
> more flexibility in the syntax that can be used to achieve a particular
> output DAG.
> === cut ===
>
> This paragraph assumes the reader is familiar with intricate details of the
> YAML grammar and semantics. ?I bet most of your audience are completely lost
> here.
>
> === cut ===
> Enhanced example::
>
> ? ?key1/key2a
> ? ? ? ?key3a = Some random string
> ? ? ? ?key3b = 42
> ? ?key1/key2a
> ? ? ? ?key3c
> ? ? ? ? ? ?1
> ? ? ? ? ? ?2
> ? ? ? ? ? ?{}
> ? ? ? ? ? ? ? ?key4a = anything
> ? ? ? ? ? ? ? ?key4b = something else
> ? ? ? ? ? ?[]
> ? ? ? ? ? ? ? ?a
> ? ? ? ? ? ? ? ?b
> ? ? ? ? ? ? ? ?c
> ? ? ? ? ? ?3
> ? ? ? ? ? ?4
> ? ?key1/key2b = [1, 2, 3, 4]
> ? ?key5 = ""
> ? ? ? This is a multi-line string. ?It is
> ? ? ? ? ?dedented to the farthest left
> ? ? ? ? ?column that is indented from
> ? ? ? ? ?the line containing "".
> ? ?key6 = [""]
> ? ? ? This is an array of strings, one per line.
> ? ? ? Each string is dedented appropriately.
> === cut ===
>
> Frankly, this is an example that only a mother could love. ?I'd suggest you
> to add some real-world examples, make sure they look nice and put them to
> the introductory part of the document. ?Examples is how the format will be
> evaluated by the readers, and yours don't stand a chance.
>
> Seriously, the only reason YAML enjoys its moderate popularity despite its
> overcomplicated grammar, chronic lack of manpower and deficient
> implementations is because it's so cute.
>
>
>
> Disclaimer: I'm the author of PyYAML and libyaml.
>
> Thanks,
> Kirill
>


From pmaupin at gmail.com  Mon Mar  1 21:21:37 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 20:21:37 -0600
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <4B8C71BA.9060106@gamma.dn.ua>
References: <d09829f51002281809w2d2e556ct841f5adaaf78a723@mail.gmail.com>
	<4B8C71BA.9060106@gamma.dn.ua>
Message-ID: <d09829f51003011821m6ed8521dh3726d08b80da33ea@mail.gmail.com>

On Mon, Mar 1, 2010 at 8:02 PM, Kirill Simonov <xi at gamma.dn.ua> wrote:

BTW, congratulations on slogging through the YAML grammar to generate
such a good working C library!

That must have been a tremendous effort.

Regards,
Pat


From nipukumar at gmail.com  Mon Mar  1 21:39:54 2010
From: nipukumar at gmail.com (Niranjan Kumar Das)
Date: Mon, 1 Mar 2010 18:39:54 -0800
Subject: New User
Message-ID: <a9418ba51003011839h3f61d0c6r9af8cfc3181e6ff0@mail.gmail.com>

Hello Group,
I am starting to programme in python 1st time. Just thought i will ask the
group members about some well known useful books. I am looking for books at
two level.

a) For beginers
b) For Advaced user

Appreciate your help and suggestion in the matter.

Thanks,
Niranjan
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From xi at gamma.dn.ua  Mon Mar  1 21:54:51 2010
From: xi at gamma.dn.ua (Kirill Simonov)
Date: Mon, 01 Mar 2010 21:54:51 -0500
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <d09829f51003011819p70287a31k9edde871066294ff@mail.gmail.com>
References: <d09829f51002281809w2d2e556ct841f5adaaf78a723@mail.gmail.com>	
	<4B8C71BA.9060106@gamma.dn.ua>
	<d09829f51003011819p70287a31k9edde871066294ff@mail.gmail.com>
Message-ID: <4B8C7DFB.8000800@gamma.dn.ua>

Patrick Maupin wrote:
> Kirill:
> 
> Thank you for your constructive criticism.  This is the gem that made
> it worthwhile to post my document.  I think all of your points are
> spot-on, and I will be fixing the documentation.

You are welcome.  Despite what others have been saying, I don't think 
this area is closed to innovations.


> I can well believe that the C implementation of YAML is much faster
> than the Python one, but I am aiming for something that will be
> reasonably quick in pure Python.  I will double-check the JSON C test
> results, but something I probably did not make clear is that the 22
> seconds is not spent parsing -- that is for the entire test, which
> involves reading restructured text and generating some 160 separate
> PDF files.

Yes, this makes more sense.  It's quite possible that the pure-Python 
PyYAML parser is much slower than the pure-Python JSON parser.

At the same time, semantically meaningful whitespaces will likely hinder 
the pure-Python performance.  To make it fast, you'll need to convert 
the inner loops of the parser to regexps, and it is hard to support 
variable-length indentation with static regular expressions.


Thanks,
Kirill


From xi at gamma.dn.ua  Mon Mar  1 22:03:22 2010
From: xi at gamma.dn.ua (Kirill Simonov)
Date: Mon, 01 Mar 2010 22:03:22 -0500
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <d09829f51003011821m6ed8521dh3726d08b80da33ea@mail.gmail.com>
References: <d09829f51002281809w2d2e556ct841f5adaaf78a723@mail.gmail.com>	
	<4B8C71BA.9060106@gamma.dn.ua>
	<d09829f51003011821m6ed8521dh3726d08b80da33ea@mail.gmail.com>
Message-ID: <4B8C7FFA.4080909@gamma.dn.ua>

Patrick Maupin wrote:
> On Mon, Mar 1, 2010 at 8:02 PM, Kirill Simonov <xi at gamma.dn.ua> wrote:
> 
> BTW, congratulations on slogging through the YAML grammar to generate
> such a good working C library!
> 
> That must have been a tremendous effort.

The trick was to completely ignore the grammar described in the 
specification.  In fact, the syntax of YAML is pretty close the Python 
syntax and, with some effort, the Python scanner and parser could be 
adapted to parsing YAML.  Once I realized it, I got a working parser in 
a week or so.

Thanks,
Kirill


From anand.shashwat at gmail.com  Mon Mar  1 22:35:16 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Tue, 2 Mar 2010 09:05:16 +0530
Subject: New User
In-Reply-To: <a9418ba51003011839h3f61d0c6r9af8cfc3181e6ff0@mail.gmail.com>
References: <a9418ba51003011839h3f61d0c6r9af8cfc3181e6ff0@mail.gmail.com>
Message-ID: <d4ab53de1003011935r3873fd46jc09331f8c5903c40@mail.gmail.com>

for beginners :
http://openbookproject.net/thinkcs/python/english2e/index.html
python cookbook - 2 by alex martelli is fantastic if you have your basics
cleared.

On Tue, Mar 2, 2010 at 8:09 AM, Niranjan Kumar Das <nipukumar at gmail.com>wrote:

> Hello Group,
> I am starting to programme in python 1st time. Just thought i will ask the
> group members about some well known useful books. I am looking for books at
> two level.
>
> a) For beginers
> b) For Advaced user
>
> Appreciate your help and suggestion in the matter.
>
> Thanks,
> Niranjan
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From roy at panix.com  Mon Mar  1 23:27:41 2010
From: roy at panix.com (Roy Smith)
Date: Mon, 1 Mar 2010 20:27:41 -0800 (PST)
Subject: Adding to a module's __dict__?
Message-ID: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>

>From inside a module, I want to add a key-value pair to the module's
__dict__.  I know I can just do:

FOO = 'bar'

at the module top-level, but I've got 'FOO' as a string and what I
really need to do is

__dict__['Foo'] = 'bar'

When I do that, I get "NameError: name '__dict__' is not defined".  Is
it possible to do what I'm trying to do?


From tjreedy at udel.edu  Mon Mar  1 23:55:25 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 01 Mar 2010 23:55:25 -0500
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
Message-ID: <hmi5ns$57b$1@dough.gmane.org>

On 3/1/2010 7:56 PM, Patrick Maupin wrote:
> On Mar 1, 5:57 pm, Erik Max Francis<m... at alcyone.com>  wrote:
>> Patrick Maupin wrote:
>> This not only seriously stretching the meaning of the term "superset"
>> (as Python is most definitely not even remotely a superset of JSON), but
>
> Well, you are entitled to that opinion, but seriously, if I take valid
> JSON, replace unquoted true with True, unquoted false with False,
> replace unquoted null with None, and take the quoted strings and
> replace occurrences of \uXXXX with the appropriate unicode, then I do,
> in fact, have valid Python.  But don't take my word for it -- try it
> out!

To me this is so strained that I do not see why why you are arguing the 
point. So what? The resulting Python 'program' will be equivalent, I 
believe, to 'pass'. Ie, construct objects and then discard them with no 
computation or output. I suggest dropping this red-herring distraction.

> But if you really want to be pedantic about it, JavaScript (rather
> than Python) is, in fact a superset of JSON, and, despite the
> disparagement JavaScript receives, in my opinion, it is possible to
> write much better looking JavaScript than JSON for many tasks.
>
> YAML, also, is a superset of JSON, and IMO, it is possible to write
> much better looking YAML than JSON.

I agree that adding a bit of syntax to something can sometimes make it 
easier to write readable text. This is hardly a new idea and should not 
be controversial.  That is why people developed 'macro assembley' as a 
superset of 'assembly' languages and why, for instance, Python added the 
'with' statement.

I read your proposal. I have not needed config files and have never 
written json or yaml and so cannot really evaluate your proposal for 
something 'in between'. It does seem plausible that it could be useful.

While using the PEP format is great, calling your currently vaperware 
module proposal a 'standards track' PEP is somewhat off-putting and 
confusing. If Guido rejected it, would you simply drop the idea? If not, 
if you would continue it as a third-party module that would eventually 
be released and announced on PyPI, I seriously suggest renaming it to 
what it is.

Terry Jan Reedy



From clp2 at rebertia.com  Tue Mar  2 00:38:34 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 1 Mar 2010 21:38:34 -0800
Subject: Adding to a module's __dict__?
In-Reply-To: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>
Message-ID: <50697b2c1003012138k1a0083d0r3fc12fdfe5bc5857@mail.gmail.com>

On Mon, Mar 1, 2010 at 8:27 PM, Roy Smith <roy at panix.com> wrote:
> >From inside a module, I want to add a key-value pair to the module's
> __dict__. ?I know I can just do:
>
> FOO = 'bar'
>
> at the module top-level, but I've got 'FOO' as a string and what I
> really need to do is
>
> __dict__['Foo'] = 'bar'
>
> When I do that, I get "NameError: name '__dict__' is not defined". ?Is
> it possible to do what I'm trying to do?

Yes; just modify the dict returned by the globals() built-in function
instead. It's usually not wise to do this and is better to use a
separate dict instead, but I'll assume you know what you're doing and
have good reasons to disregard the standard advice due to your
use-case.

Cheers,
Chris
--
One should avoid using the Big Hammer unnecessarily,
but sometimes you really do need it and it's nice that it's available
for such cases.
http://blog.rebertia.com


From narkewoody at gmail.com  Tue Mar  2 00:48:33 2010
From: narkewoody at gmail.com (Steven Woody)
Date: Tue, 2 Mar 2010 13:48:33 +0800
Subject: How to find an COM object in using of pywin32
Message-ID: <ed4892841003012148j25ac9ca5v8d98ff363438ca10@mail.gmail.com>

Hi,

I want to interactive with an OLE application with pywin32.  The
problem is I get totally no idea how to find the object in OLEView and
how to figure out it's interface.

With pywin32's example, I even don't understand that in the below statement,

  win32com.client.Dispatch('Excel.Application')

that where the name 'Excel.Application' comes from?  In OLEView
(Microsoft's COM brower), I cannot find this name.


Could you give me any help?  Thanks


-- 
Life is the only flaw in an otherwise perfect nonexistence
    -- Schopenhauer

narke
public key at http://subkeys.pgp.net:11371 (narkewoody at gmail.com)


From vaidehi.pawar at yahoo.co.in  Tue Mar  2 01:50:05 2010
From: vaidehi.pawar at yahoo.co.in (Vaidehi Pawar)
Date: Tue, 2 Mar 2010 12:20:05 +0530 (IST)
Subject: No subject
Message-ID: <745414.12322.qm@web95110.mail.in2.yahoo.com>

http://adimteknikhirdavat.com/James.html


      The INTERNET now has a personality. YOURS! See your Yahoo! Homepage. http://in.yahoo.com/



From darcy at druid.net  Tue Mar  2 01:58:13 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Tue, 2 Mar 2010 01:58:13 -0500
Subject: taking python enterprise level?...
In-Reply-To: <778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>
	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>
	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>
Message-ID: <20100302015813.5397655e.darcy@druid.net>

On Mon, 1 Mar 2010 16:20:06 -0800 (PST)
mdipierro <massimodipierro71 at gmail.com> wrote:
> Joins are the bottle neck of most web app that relay on relational
> databases. That is why non-relational databases such as Google App
> Engine, CouchDB, MongoDB do not even support Joins. You have to try to
> minimize joins as much as possible by using tricks such as de-
> normalization and caching.

I keep seeing this statement but nothing to back it up.  I have created
many apps that run on Python with a PostgreSQL database with a fully
normalized schema and I can assure you that database joins were never
my problem unless I made a badly constructed query or left off a
critical index.

> I meant 512MB. The point is you need a lot of ram because you want to
> run multiple python instances, cache in ram as much as possible and
> also allow the database to buffer in ram as much as possible. You will
> see Ram usage tends to spike when you have lots of concurrent
> requests.

Put as much memory as you can afford/fit into your database server.
It's the cheapest performance boost you can get.  If you have a serious
application put at least 4GB into your dedicated database server.
Swapping is your enemy.

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


From arnodel at googlemail.com  Tue Mar  2 02:09:24 2010
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Tue, 02 Mar 2010 07:09:24 +0000
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
Message-ID: <m2r5o3xkrf.fsf@googlemail.com>

Erik Max Francis <max at alcyone.com> writes:

> Patrick Maupin wrote:
>> On Feb 28, 9:18 pm, Steven D'Aprano > Wait a minute... if JSON is too
>> hard to edit, and RSON is a *superset* of
>>> JSON, that means by definition every JSON file is also a valid RSON file.
>>> Since JSON is too hard to manually edit, so is RSON.
>>
>> Well, Python is essentially a superset of JSON, with string escape
>> handling being ever so slightly different, and using True instead of
>> true, False instead of false, and None instead of null.  YMMV, but I
>> find it possible, even probable, to write Python that is far easier to
>> edit than JSON, and in fact, I have used Python for configuration
>> files that are only to be edited by programmers or other technical
>> types.
>
> This not only seriously stretching the meaning of the term "superset"
> (as Python is most definitely not even remotely a superset of JSON),
> but still doesn't address the question.  Is RSON and _actual_ superset
> of JSON, or are you just misusing the term there, as well?  If it is,
> then your rationale for not using JSON makes no sense if you're making
> a new format that's merely a superset of it.  Obviously JSON can't be
> that unreadable if you're _extending_ it to make your own "more
> readable" format.  If JSON is unreadable, so must be RSON.

Your argument is utterly speculative as you are making clear you haven't
read the OP's proposal.

-- 
Arnaud


From techupdater.admin at gmail.com  Tue Mar  2 02:58:01 2010
From: techupdater.admin at gmail.com (Rishabh Verma)
Date: Mon, 1 Mar 2010 23:58:01 -0800 (PST)
Subject: OSSCamp Chandigarh April 2010 - Open Source Is The Future
Message-ID: <9ca0e032-94d2-47f0-8f88-e8113f9ad795@z10g2000prh.googlegroups.com>

Hello All,

OSSCamp is again being organized in Chandigarh on April 10, 2010. This
is another step ahead to foster the open source community in the city
beautiful. This event is a purely community organized event by some of
the open source evangelists of Chandigarh and it would be great if you
guys join us to make this event a great success. At a Camp, we love to
cross-talk, huddle together, raise some noise, celebrate technology,
argue over the coolest OS, fight on our fav programming languages,
discuss stuff, and what not!

OSScamp Chandigarh April 2010
April 10, 2009
Venue: To Be Decided
Time: 10AM - 6PM

You can register for the event at : http://chd.osscamp.in/

Follow Us on Twitter : http://twitter.com/osscamp

Facebook Event Page : http://www.facebook.com/event.php?eid=247304090115&ref=ts


From alfps at start.no  Tue Mar  2 03:42:46 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Tue, 02 Mar 2010 09:42:46 +0100
Subject: How to find an COM object in using of pywin32
In-Reply-To: <mailman.97.1267508914.23598.python-list@python.org>
References: <mailman.97.1267508914.23598.python-list@python.org>
Message-ID: <hmij28$3sj$1@news.eternal-september.org>

* Steven Woody:
> Hi,
> 
> I want to interactive with an OLE application with pywin32.  The
> problem is I get totally no idea how to find the object in OLEView and
> how to figure out it's interface.
> 
> With pywin32's example, I even don't understand that in the below statement,
> 
>   win32com.client.Dispatch('Excel.Application')
> 
> that where the name 'Excel.Application' comes from?  In OLEView
> (Microsoft's COM brower), I cannot find this name.

It's a "programmatic identifier" a.k.a. "progid".

It identifies a COM class and it's used as a readable but more 
name-collision-prone alternative to the 128-bit UUID.

You can find the programmatic identifiers in the Windows registry (use e.g. 
regedit); often they're not documented.


Cheers,

- Alf


From bruno.42.desthuilliers at websiteburo.invalid  Tue Mar  2 03:57:52 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 02 Mar 2010 09:57:52 +0100
Subject: Method / Functions - What are the differences?
In-Reply-To: <mailman.81.1267492052.23598.python-list@python.org>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
Message-ID: <4b8cd310$0$4604$426a34cc@news.free.fr>

John Posner a ?crit :
> On 3/1/2010 2:59 PM, Bruno Desthuilliers wrote:
> 
>> Answer here:
>>
>> http://groups.google.com/group/comp.lang.python/tree/browse_frm/thread/bd71264b6022765c/3a77541bf9d6617d#doc_89d608d0854dada0 
>>
>>
>> I really have to put this in the wiki :-/
> 
> 
> Bruno, I performed a light copy-edit of your writeup and put in some 
> reStructuredText (reST) markup. The result is at:
> 
>   http://cl1p.net/bruno_0301.rst/

Cool.

> 
> The only sentence that I think needs work is:
> 
>   Having access to itself (of course), the
>   instance (if there's one) and the class, it's easy for it
>   to wrap all this into a **method** object.
> 
> Maybe this?
> 
>   With the instance object (if any) and class object available,
>   it's easy to create a method object that wraps the function object.

That's perfect.

But there's also a typo to fix in the Python implementation of the 
Method object: in the call method, it should inject self.im_self as 
first arg, not self.im_func. This had been spotted by someone named John 
Posner, IIRC !-)


> 
> Begging pardon for my presumptuousness,

Begging pardon for my laziness :-/


From groups_ads12 at yahoo.com  Tue Mar  2 04:43:53 2010
From: groups_ads12 at yahoo.com (groups_ads12)
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google ajax api
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jsf ajax <http://www.ajax.learn.net.in/videos/index.php?search=jsf+ajax>

jsf and ajax
<http://www.ajax.learn.net.in/videos/index.php?search=jsf+and+ajax>

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uest>

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orial>

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From fetchinson at googlemail.com  Tue Mar  2 05:09:54 2010
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Tue, 2 Mar 2010 11:09:54 +0100
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org>
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
Message-ID: <fbe2e2101003020209l27a6d1d3l7a1d04ffca40bbaf@mail.gmail.com>

>> > But you are working on a solution in search of a problem.  The really
>> > smart thing to do would be pick something more useful to work on.  We
>> > don't need another configuration language.  I can't even say "yet
>> > another" because there's already a "yet another" called yaml.
>>
>> And in case you are new here let me assure you that Paul is saying
>> this with his full intention of being helpful to you. I also would
>> think that working on such a project might be fun and educational for
>> you but completely useless if you have users other than yourself in
>> mind. Again, I'm trying to be helpful here, so you can focus on a
>> project that is both fun/educational for you and also potentially
>> useful for others. This RSON business is not one of them.
>
> OK, but I am a bit unclear on what you and/or Paul are claiming.  It
> could be one of a number of things.  For example:
>
> - There is a preexisting file format suitable for my needs, so I
> should not invent another one.

I suspect this to be true, if we mean the same thing by "configuration
file format". Especially if RSON will be a superset of JSON.

> - If I invent a file format suitable for my needs, it couldn't
> possibly be general enough for anybody else.

Quite possibly, the reason is that the already existing file formats
have an ecosystem around them that make them attractive. Your file
format will have to cope with this barrier to attract new users which
I think will be very difficult, given the wide range of already
existing formats, covering just about any use case.

> - Even if it was general enough for somebody else, there would only be
> two of them.

See above.

> I've been known to waste time (or be accused of wasting time) on
> various endeavors, but I like to know exactly *why* it is perceived to
> be a waste.

Don't get me wrong, I also waste lot of time on hobby/fun/educational
projects ("waste" in this case is only meant as "useless for others",
not "useless for me") because it's, well, hobby and fun and
educational :) It's just good to know if a given project is in this
category or outside.

Cheers,
Daniel



-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From jeanmichel at sequans.com  Tue Mar  2 05:29:33 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Tue, 02 Mar 2010 11:29:33 +0100
Subject: Adding to a module's __dict__?
In-Reply-To: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>
Message-ID: <4B8CE88D.8030404@sequans.com>

Roy Smith wrote:
> >From inside a module, I want to add a key-value pair to the module's
> __dict__.  I know I can just do:
>
> FOO = 'bar'
>
> at the module top-level, but I've got 'FOO' as a string and what I
> really need to do is
>
> __dict__['Foo'] = 'bar'
>
> When I do that, I get "NameError: name '__dict__' is not defined".  Is
> it possible to do what I'm trying to do?
>   
test.py:

import sys
varName= 'foo'
setattr(sys.modules[__name__], varName, 42)



in a shell:
import test

print test.foo
 >>> 42


JM


From no-spam at non-existing.invalid  Tue Mar  2 06:11:10 2010
From: no-spam at non-existing.invalid (Robert)
Date: Tue, 02 Mar 2010 12:11:10 +0100
Subject: (and about tests) Re: Pedantic pickling error after reload?
In-Reply-To: <7uq299FrmfU1@mid.uni-berlin.de>
References: <hm6aru$514$1@news.albasani.net> <7uo1aqFitnU1@mid.uni-berlin.de>
	<hm8de7$ct5$1@news.albasani.net> <7uq299FrmfU1@mid.uni-berlin.de>
Message-ID: <hmirq4$ne8$2@news.albasani.net>

>> well, reloading is the thing which I do most in coding practice :-)
>> For me its a basic thing like cell proliferation in biology.
>
> I simply never do it. It has subtle issues, one of them you found,
> others you say you work around by introducing actual frameworks. But you
> might well forget some corner-cases & suddently chase a chimera you deem
> a bug, that in fact is just an unwanted side-effect of reloading.

well, at dev time there is a different rule: the more bugs, the better

(they can raise/indicate certain design and coding weaknesses)

>
> And all this extra complexity is only good for the process of actually
> changing the code. It doesn't help you maintaining code quality.

neither does a improved editor, interactive/debugging/reload 
scheme replace tests, nor do tests replace them the other way 
around. different dimensions. just the benefactions on all levels 
radiate recursively of course ...
e.g. by a good reload scheme one can even work the tests out 
better (and debug more efficiently when the tests bump).

that little reload support code is a rather constant small stub 
compared to the app size (unless with trivial 1-day apps maybe).
Most 'utility' modules don't need extra care at all.
Plus maybe 1 .. 5 extra lines per few frequently changed GUI 
classes (when well organized) and some 5..10 lines for 
preserving/re-fixing the few application data anchors. Thats all. 
No need to get it fully consistent, as serves its purpose when 
editing during runtime is possible in 'most cases'. And most edit 
cases during debug sessions are typically just small fixes and 
touches of function code. One fix revealing the next follow-up bug 
.. beautifying things .. as it is.
critical data structure changes are very rare occasions.

A general reload scheme ("edit at runtime") zeroes out most 
effectively a core time consumer while exploring, iterating, 
debugging, smoothing ..
On the time scale of these tasks, this effect can in my opinion by 
far not be matched equivalently by setup code of whatever kind in 
non-trivial apps. (As I did/do this before or with less dynamic 
programming languages)

>> I typically need just 1 full app reboot on 20..50 edit-run-cycles I
>> guess. And just few unit test runs per release. Even for
>> Cython/pyximport things I added support for this reload edit-run-cycle,
>> because I cannot imagine to dev without this.
>
> Let me assure you - it works :)
>
> for example yesterday, I create a full CRUD-interface for a web-app
> (which is the thing I work on mostly these days) without *once* taking a
> look at the browser. I wrote actions, forms, HTML, and tests along,
> developed the thing ready, asserted certain constraints and error-cases,
> and once finished, fired up the browser - and he saw, it worked!
>
> Yes, I could have written that code on the fly, hitting F5 every few
> seconds/minutes to see if things work out (instead of just running the
> specific tests through nose) - and once I'd be finished, I didn't have
> anything permanent that ensured the functionality over time.

well in this 1-day example you coded a thing which obviously you 
had already done similarly several times. still I guess, you had 
some debug session too. some exploration of new things and new 
aspects. profiting e.g. particularly from the Python interactive / 
interactive debugger, post mortem etc. ..
unless you type so perfect from scratch as that guy in Genesis 1 :-)

>> this is a comfortable quasi religious theory raised often and easily
>> here and there - impracticable and very slow on that fine grained code
>> evolution level however. an interesting issue.
>
> To me, that's as much as an religious statement often heard by people
> that aren't (really) into test-driven development. By which I personally
> don't mean the variant where one writes tests first, and then code. I
> always develop both in lock-step, sometimes introducing a new feauter
> first in my test as e.g. new arguments, or new calls, and then
> implementing them, but as often the other way round.
>
> The argument is always a variation of "my problem is to complicated, the
> code-base to interviened to make it possible to test this".

well, nothing against preaching about tests ;-) , unless its too 
much.
like with every extreme there is also a threshold where you don't 
draw anymore at the bottom line by adding more tests. there are 
costs too. other bottle necks ...

its not against test writing for testing/validating/stabilizing 
and other indirect high-level benefactions. there are simply other 
dimensions too, which are worth a thought or two. the question 
about a good reload scheme is more oriented towards the 
debugging/interactive/exploration/editing level. things, where 
particularly Python opens new dimensions by its superior dynamic 
and self-introspective nature.

> I call this a bluff. You might work with a code-base that makes it
> harder than needed to write tests for new functionality. But then, most
> of the time this is a sign of lack of design. Writing with testability
> in mind makes you think twice about how to proper componentize your
> application, clearly separate logic from presentation, validates
> API-design because using the API is immediatly done when writing the
> tests you need, and so forth.

yes, tests writing can also induce a better code modularization.
a good editor, good debugging/reload scheme etc also radiate... 
the test runner can be connected to the post mortem 
debugger/interactive and so on.

>> "Reload > pychecker/pylint > tests" works most effectively with Python
>> in my opinion.
>> And for GUI-development the difference is max.
>> (min for math algorithms which are well away from data structures/OO)
>
> As I said, I mainly do web these days. Which can be considered GUIs as
> well. Testing the HTTP-interface is obviously easier & possible, and
> what I described earlier.
>
> But we also use selenium to test JS-driven interfaces, as now the
> complexity of the interface rises, with all the bells & whistles of
> ajaxiness and whatnot.

(the CRUD approach on 'form handling IO level' as it is typically 
more simple regarding tests writing than GUI programming - because 
of the atomic operations and straight interface. similar like alg 
and I/O testing.
While test writing for a flattery JS/CSS-heavy multi-language 
multi-state web GUIs (with subtle user interactions) is perhaps 
similar complex than doing it for a desktop GUI app I think.
)

>> A rule that unit tests are used only near a release or a milestone is
>> healthy in that sense I think.
>> (And a quick edit-(real)run-interact cycle is good for speed)
>
> Nope, not in my opinion. Making tests an afterthought may well lead to
> them being written carelessly, not capturing corner-cases you

Anyway one can formulate/write tests on each error/problem/design 
question which one thinks is worth a test.

A interesting question may be however: if the tests (both: unit 
tests and auto code checks) should be _run_ permanently - in order 
to lets say have a 'zero test dump status' overall every few 
minutes, at the time scale of editing/exploring/debugging ?

I think that one doesn't loose on the savety net effect, but one 
wins on overall validation power of the tests, when one _uses_ the 
(new and old) tests not too often: more rarely/later/before the 
'release'. because after many things are rewired in the code 
(incl. test code) for a milestone/release step or, each bump which 
arises fresh, lets you think/cure about the network effects and 
deeper effect of errors in common, similar contexts etc.

While when one makes the code fit against the 'few artificial 
tests' (which are always very/too few!) too fast on the wrong time 
scale, its like in that example of quick antibiotica 
application/abuse: the cure for the bumps then tend to be too 
short sighted. symptom curing. while the clever bugs arise in 
background ...

having fresh written tests unused for some time is no problem, 
because they will induce there own debug session sooner or later ..

> Testing is no silver bullet. But it's a rather mighte sword.. :)
>

I'd say testing has its place amongst other things and dimensions 
like (incomplete):

Editor:      type, browse
Language:    formulate
Interactive: inspect, try
Debug:       inspect, fix
Reload:      fix, iterate, explore, clean
Design:      organize
Code checks: stabilize
Unit tests:  stabilize
Feedback:    realize

Each issue can be improved. effective in overall speed. He saw:

If you have no good editor there is some 1.5 .. 2 x less dev 
speed. If you have no Python (Ruby, Groovy...) there is some 1.5 
.. 2 x less dev speed. If you have no good Interactive/Debugging 
there is some 1.5 .. 2 x less dev speed. If you have no improved 
reload scheme there is another 1.5 .. 2 x less dev speed. If you 
have no good design scheme there is another 1.5 .. 2 x less dev 
speed. If you have no good code checks there is another 1.5 .. 2 x 
less dev speed. If you have no good test scheme there is another 
1.5 .. 2 x less dev speed. If you have no good bug report scheme 
there is another 1.5 .. 2 x less dev speed. ...

A improved reload scheme may even speed up at the center of the 
development wheel: iteration. I guess I underrated...


Robert


From emannion at gmail.com  Tue Mar  2 06:34:16 2010
From: emannion at gmail.com (enda man)
Date: Tue, 2 Mar 2010 03:34:16 -0800 (PST)
Subject: Call Signtool using python
Message-ID: <24bf5006-db86-4415-89ec-c5eab8f1c740@x22g2000yqx.googlegroups.com>

Hi,

I want to call the Windows signtool to sign a binary from a python
script.

Here is my script:
//
os.chdir('./Install/activex/cab')
subprocess.call(["signtool", "sign", "/v", "/f", "webph.pfx", "/t",
"http://timestamp.verisign.com/scripts/timstamp.dll", "WebPh.exe" ])
//

But I am getting this error:
////
SignTool Error: The specified PFX password is not correct.

Number of files successfully Signed: 0
Number of warnings: 0
Number of errors: 1
Finished building plugin installer
scons: done building targets.
////


This python script is called as part of a scons build, which is also
python code.

Anyone seen this before or can pass on any ideas.
Tks,
EM




From wuwei23 at gmail.com  Tue Mar  2 07:50:25 2010
From: wuwei23 at gmail.com (alex23)
Date: Tue, 2 Mar 2010 04:50:25 -0800 (PST)
Subject: Verifying My Troublesome Linkage Claim between Python and Win7
References: <hm0jn4$tnf$1@news.eternal-september.org>
Message-ID: <f75d9438-412a-4494-9918-527a1cd7b960@a5g2000prg.googlegroups.com>

"W. eWatson" <wolftra... at invalid.com> wrote:
> My claim is that if one creates a program in a folder that reads a file
> in the folder it and then copies it to another folder, it will read ?the
> data file in the first folder, and not a changed file in the new folder.
> I'd appreciate it if some w7 users could try this, and let me know what
> they find.

On a fresh install of Win7 Ultimate, I created your program & the text
file in one folder, then copied the program both using ctrl-c/ctrl-v
and later ctrl-drag-&-drop. In both cases, the copied program *did
not* refer to the text file when executed:

D:\projects>a
Traceback (most recent call last):
  File "D:\projects\a.py", line 1, in <module>
    track_file = open("verify.txt")
IOError: [Errno 2] No such file or directory: 'verify.txt'

Whatever you seem to think you did, you didn't, or you're not
providing enough detail on what you did to repeat the behaviour.

I do agree with the sentiment that this isn't a Python issue.


From vriolk at gmail.com  Tue Mar  2 08:12:37 2010
From: vriolk at gmail.com (coldpizza)
Date: Tue, 2 Mar 2010 05:12:37 -0800 (PST)
Subject: How to use python to register a service (an existing .exe file)
References: <4b79e28c$0$4610$426a74cc@news.free.fr>
Message-ID: <7655fe5a-3f37-4835-8fa2-cf95928ef124@q16g2000yqq.googlegroups.com>

instsrv.exe does not come with Windows by default, but I guess it
should be possible to add a service using the win32 built-in `sc`
command line tool.

Try `sc create` from a console.

The app you want to install as a service will still have to be
compliant with the win32 service interface, otherwise it will throw an
error, although the app will still be started.

On Feb 16, 2:10?am, News123 <news... at free.fr> wrote:
> Hi,
>
> Is there a python way to register new windows services.
>
> I am aware of the
> instsrv.exe program, which can be used to install services.
> I could use subprocess.Popen to call
>
> instsrv.exe "service_name" program.exe
>
> but wondered, whether there's already an existing function.
>
> Thans in advance and bye
>
> N



From roy at panix.com  Tue Mar  2 08:21:03 2010
From: roy at panix.com (Roy Smith)
Date: Tue, 02 Mar 2010 08:21:03 -0500
Subject: Adding to a module's __dict__?
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>
	<mailman.96.1267508316.23598.python-list@python.org>
Message-ID: <roy-3CB7A4.08210202032010@news.panix.com>

In article <mailman.96.1267508316.23598.python-list at python.org>,
 Chris Rebert <clp2 at rebertia.com> wrote:

> On Mon, Mar 1, 2010 at 8:27 PM, Roy Smith <roy at panix.com> wrote:
> > >From inside a module, I want to add a key-value pair to the module's
> > __dict__. ??I know I can just do:
> >
> > FOO = 'bar'
> >
> > at the module top-level, but I've got 'FOO' as a string and what I
> > really need to do is
> >
> > __dict__['Foo'] = 'bar'
> >
> > When I do that, I get "NameError: name '__dict__' is not defined". ??Is
> > it possible to do what I'm trying to do?
> 
> Yes; just modify the dict returned by the globals() built-in function
> instead.

Ah, cool.  Thanks.

> It's usually not wise to do this and is better to use a
> separate dict instead, but I'll assume you know what you're doing and
> have good reasons to disregard the standard advice due to your
> use-case.

Why is it unwise?

The use case is I'm importing a bunch of #define constants from a C header 
file.  I've got triples that I want to associate; the constant name, the 
value, and a string describing it.  The idea is I want to put in the 
beginning of the module:

declare('XYZ_FOO', 0, "The foo property")
declare('XYZ_BAR', 1, "The bar property")
declare('XYZ_BAZ', 2, "reserved for future use")

and so on.  I'm going to have hundreds of these, so ease of use, ease of 
maintenance, and niceness of presentation are important.

My declare() function will not just set XYZ_FOO = 1 at module global scope, 
but also insert entries in a variety of dicts so I can look up the 
description string, map from a value back to the constant name, etc.

I *could* do this in a separate dict, but the notational convenience of 
being able to have the original constant names globally available is pretty 
important.


From steve at holdenweb.com  Tue Mar  2 08:33:11 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 02 Mar 2010 08:33:11 -0500
Subject: Adding to a module's __dict__?
In-Reply-To: <roy-3CB7A4.08210202032010@news.panix.com>
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>	<mailman.96.1267508316.23598.python-list@python.org>
	<roy-3CB7A4.08210202032010@news.panix.com>
Message-ID: <4B8D1397.5050507@holdenweb.com>

Roy Smith wrote:
> In article <mailman.96.1267508316.23598.python-list at python.org>,
>  Chris Rebert <clp2 at rebertia.com> wrote:
> 
>> On Mon, Mar 1, 2010 at 8:27 PM, Roy Smith <roy at panix.com> wrote:
>>> >From inside a module, I want to add a key-value pair to the module's
>>> __dict__. ? I know I can just do:
>>>
>>> FOO = 'bar'
>>>
>>> at the module top-level, but I've got 'FOO' as a string and what I
>>> really need to do is
>>>
>>> __dict__['Foo'] = 'bar'
>>>
>>> When I do that, I get "NameError: name '__dict__' is not defined". ? Is
>>> it possible to do what I'm trying to do?
>> Yes; just modify the dict returned by the globals() built-in function
>> instead.
> 
> Ah, cool.  Thanks.
> 
>> It's usually not wise to do this and is better to use a
>> separate dict instead, but I'll assume you know what you're doing and
>> have good reasons to disregard the standard advice due to your
>> use-case.
> 
> Why is it unwise?
> 
> The use case is I'm importing a bunch of #define constants from a C header 
> file.  I've got triples that I want to associate; the constant name, the 
> value, and a string describing it.  The idea is I want to put in the 
> beginning of the module:
> 
> declare('XYZ_FOO', 0, "The foo property")
> declare('XYZ_BAR', 1, "The bar property")
> declare('XYZ_BAZ', 2, "reserved for future use")
> 
> and so on.  I'm going to have hundreds of these, so ease of use, ease of 
> maintenance, and niceness of presentation are important.
> 
> My declare() function will not just set XYZ_FOO = 1 at module global scope, 
> but also insert entries in a variety of dicts so I can look up the 
> description string, map from a value back to the constant name, etc.
> 
> I *could* do this in a separate dict, but the notational convenience of 
> being able to have the original constant names globally available is pretty 
> important.
> 
And how important is it to make sure that whatever data your program
processes doesn't overwrite the actual variable names you want to use to
program the processing?

If you use this technique you are effectively making your program a
hostage to fortune, as you no longer control the namespace you are using
for the programming.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/


From steve at holdenweb.com  Tue Mar  2 08:33:11 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 02 Mar 2010 08:33:11 -0500
Subject: Adding to a module's __dict__?
In-Reply-To: <roy-3CB7A4.08210202032010@news.panix.com>
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>	<mailman.96.1267508316.23598.python-list@python.org>
	<roy-3CB7A4.08210202032010@news.panix.com>
Message-ID: <4B8D1397.5050507@holdenweb.com>

Roy Smith wrote:
> In article <mailman.96.1267508316.23598.python-list at python.org>,
>  Chris Rebert <clp2 at rebertia.com> wrote:
> 
>> On Mon, Mar 1, 2010 at 8:27 PM, Roy Smith <roy at panix.com> wrote:
>>> >From inside a module, I want to add a key-value pair to the module's
>>> __dict__. ? I know I can just do:
>>>
>>> FOO = 'bar'
>>>
>>> at the module top-level, but I've got 'FOO' as a string and what I
>>> really need to do is
>>>
>>> __dict__['Foo'] = 'bar'
>>>
>>> When I do that, I get "NameError: name '__dict__' is not defined". ? Is
>>> it possible to do what I'm trying to do?
>> Yes; just modify the dict returned by the globals() built-in function
>> instead.
> 
> Ah, cool.  Thanks.
> 
>> It's usually not wise to do this and is better to use a
>> separate dict instead, but I'll assume you know what you're doing and
>> have good reasons to disregard the standard advice due to your
>> use-case.
> 
> Why is it unwise?
> 
> The use case is I'm importing a bunch of #define constants from a C header 
> file.  I've got triples that I want to associate; the constant name, the 
> value, and a string describing it.  The idea is I want to put in the 
> beginning of the module:
> 
> declare('XYZ_FOO', 0, "The foo property")
> declare('XYZ_BAR', 1, "The bar property")
> declare('XYZ_BAZ', 2, "reserved for future use")
> 
> and so on.  I'm going to have hundreds of these, so ease of use, ease of 
> maintenance, and niceness of presentation are important.
> 
> My declare() function will not just set XYZ_FOO = 1 at module global scope, 
> but also insert entries in a variety of dicts so I can look up the 
> description string, map from a value back to the constant name, etc.
> 
> I *could* do this in a separate dict, but the notational convenience of 
> being able to have the original constant names globally available is pretty 
> important.
> 
And how important is it to make sure that whatever data your program
processes doesn't overwrite the actual variable names you want to use to
program the processing?

If you use this technique you are effectively making your program a
hostage to fortune, as you no longer control the namespace you are using
for the programming.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From jjposner at optimum.net  Tue Mar  2 09:17:00 2010
From: jjposner at optimum.net (John Posner)
Date: Tue, 02 Mar 2010 09:17:00 -0500
Subject: Method / Functions - What are the differences?
In-Reply-To: <4b8cd310$0$4604$426a34cc@news.free.fr>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>	<4b8c2a34$0$10470$426a74cc@news.free.fr>	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
Message-ID: <hmj6k0$c7u$1@dough.gmane.org>

On 3/2/2010 3:57 AM, Bruno Desthuilliers wrote:
>>
>> With the instance object (if any) and class object available,
>> it's easy to create a method object that wraps the function object.
>
> That's perfect.


Fixed.

> But there's also a typo to fix in the Python implementation of the
> Method object: in the call method, it should inject self.im_self as
> first arg, not self.im_func. This had been spotted by someone named John
> Posner, IIRC !-)


Fixed (oops!).

I've updated the text at this location:

 >   http://cl1p.net/bruno_0301.rst/

I think the ball is back in your court, Bruno. I'd be happy to help more 
-- feel free to contact me off-list, at jjposner at optimum.net.

Best,
John



From marduk at python.net  Tue Mar  2 09:24:58 2010
From: marduk at python.net (Albert Hopkins)
Date: Tue, 02 Mar 2010 09:24:58 -0500
Subject: os.fdopen() issue in Python 3.1?
Message-ID: <1267539898.477222.7.camel@necropolis>

I have a snippet of code that looks like this:

        pid, fd = os.forkpty()
        if pid == 0:
            subprocess.call(args)
        else:
            input = os.fdopen(fd).read()
        ...


This seems to work find for CPython 2.5 and 2.6 on my Linux system.
However, with CPython 3.1 I get:

            input = os.fdopen(fd).read()
        IOError: [Errno 5] Input/output error

Is there something wrong in Python 3.1?  Is this the correct way to do
this (run a process in a pseudo-tty and read it's output) or is there
another way I should/could be doing this?

-a




From mwilson at the-wire.com  Tue Mar  2 09:26:06 2010
From: mwilson at the-wire.com (Mel)
Date: Tue, 02 Mar 2010 09:26:06 -0500
Subject: Adding to a module's __dict__?
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>
	<mailman.96.1267508316.23598.python-list@python.org>
	<roy-3CB7A4.08210202032010@news.panix.com>
Message-ID: <hmj785$lrm$1@speranza.aioe.org>

Roy Smith wrote:
[ ... ]
> Why is it unwise?
> 
> The use case is I'm importing a bunch of #define constants from a C header
> file.  I've got triples that I want to associate; the constant name, the
> value, and a string describing it.  The idea is I want to put in the
> beginning of the module:
> 
> declare('XYZ_FOO', 0, "The foo property")
> declare('XYZ_BAR', 1, "The bar property")
> declare('XYZ_BAZ', 2, "reserved for future use")
> 
> and so on.  I'm going to have hundreds of these, so ease of use, ease of
> maintenance, and niceness of presentation are important.

As long as the header file says what you think it says, you're fine.  If you 
encounter a file that does "#define sys", then the sys module is forever 
masked, and your module can't invoke it.  A header file that contains 
"#define declare" will be fun.

	Mel.




From mmitchell at transparent.com  Tue Mar  2 09:46:21 2010
From: mmitchell at transparent.com (Matt Mitchell)
Date: Tue, 2 Mar 2010 09:46:21 -0500
Subject: Call Signtool using python
In-Reply-To: <24bf5006-db86-4415-89ec-c5eab8f1c740@x22g2000yqx.googlegroups.com>
References: <24bf5006-db86-4415-89ec-c5eab8f1c740@x22g2000yqx.googlegroups.com>
Message-ID: <E3F00F47584F1944B69461EF94D1A7490A03D508@transparent3.transparent.local>

I think you need to use the /p switch to pass signtool.exe a password
when using the /f switch.
Check out
http://msdn.microsoft.com/en-us/library/8s9b9yaz%28VS.80%29.aspx for
more info.



 
-----------------------------------
The information contained in this electronic message and any attached document(s) is intended only for the personal and confidential use of the designated recipients named above. This message may be confidential. If the reader of this message is not the intended recipient, you are hereby notified that you have received this document in error, and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify sender immediately by telephone (603) 262-6300 or by electronic mail immediately. Thank you.
 
-----Original Message-----
From: python-list-bounces+mmitchell=transparent.com at python.org
[mailto:python-list-bounces+mmitchell=transparent.com at python.org] On
Behalf Of enda man
Sent: Tuesday, March 02, 2010 6:34 AM
To: python-list at python.org
Subject: Call Signtool using python

Hi,

I want to call the Windows signtool to sign a binary from a python
script.

Here is my script:
//
os.chdir('./Install/activex/cab')
subprocess.call(["signtool", "sign", "/v", "/f", "webph.pfx", "/t",
"http://timestamp.verisign.com/scripts/timstamp.dll", "WebPh.exe" ])
//

But I am getting this error:
////
SignTool Error: The specified PFX password is not correct.

Number of files successfully Signed: 0
Number of warnings: 0
Number of errors: 1
Finished building plugin installer
scons: done building targets.
////


This python script is called as part of a scons build, which is also
python code.

Anyone seen this before or can pass on any ideas.
Tks,
EM


-- 
http://mail.python.org/mailman/listinfo/python-list


From lutz at learning-python.com  Tue Mar  2 10:11:41 2010
From: lutz at learning-python.com (Mark Lutz)
Date: Tue, 2 Mar 2010 07:11:41 -0800 (PST)
Subject: Python training in Florida, April 27-29
Message-ID: <70339c5d-a874-4610-a528-787f18855a4c@y17g2000yqd.googlegroups.com>

Tired of the Winter weather?  Make your plans now to
attend our upcoming Florida Python training seminar
in April.  This 3-day public class will be held on
April 27-29, in Sarasota, Florida.  It is open to
both individual and group enrollments.

For more details on the class, as well as registration
instructions, please visit the class web page:

http://learning-python.com/2010-public-classes.html

Note that we have moved to a new domain name.  If you
are unable to attend in April, our next Sarasota class
is already scheduled for July 13-15.

Thanks, and we hope to see you at a Python class in
sunny and warm Florida soon.

--Mark Lutz at learning-python.com


From roy at panix.com  Tue Mar  2 10:19:56 2010
From: roy at panix.com (Roy Smith)
Date: Tue, 2 Mar 2010 07:19:56 -0800 (PST)
Subject: Adding to a module's __dict__?
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>
	<mailman.96.1267508316.23598.python-list@python.org>
	<roy-3CB7A4.08210202032010@news.panix.com> 
	<mailman.107.1267536800.23598.python-list@python.org>
Message-ID: <f4c188f0-7dba-4629-8a16-eed713b5920f@15g2000yqa.googlegroups.com>

On Mar 2, 8:33?am, Steve Holden <st... at holdenweb.com> wrote:

> And how important is it to make sure that whatever data your program
> processes doesn't overwrite the actual variable names you want to use to
> program the processing?

Oh, I see what you're saying.  You're thinking I was going to machine-
process the C header file and pattern-match the #define statements?
Actually, I was just hand-copying the values, and was looking for a
way to reduce typing.

But, I suppose if I were to machine-process the header files, that
would be a concern.  I suppose in that case I would make sure I only
inserted variables which matched a particular pattern (ie, "[A-Z]+_[A-
Z][A-Z0-9]+").  In fact, now that you got me thinking in that
direction...

Somewhat sadly, in my case, I can't even machine process the header
file.  I don't, strictly speaking, have a header file.  What I have is
a PDF which documents what's in the header file, and I'm manually re-
typing the data out of that.  Sigh.



From victorsubervi at gmail.com  Tue Mar  2 10:48:19 2010
From: victorsubervi at gmail.com (Victor Subervi)
Date: Tue, 2 Mar 2010 11:48:19 -0400
Subject: Email Script
Message-ID: <4dc0cfea1003020748g786aded2i9c5287972aa8984c@mail.gmail.com>

Hi;
I have the following code:

def my_mail():
  user, passwd, db, host = login()
  database = MySQLdb.connect(host, user, passwd, db)
  cursor= database.cursor()
  ourEmail1 = 'marilyn at globalsolutionsgroup.vi'
  ourEmail1 = 'phil at globalsolutionsgroup.vi'
  ourEmail2 = 'benoismyname at gmail.com'
  form = cgi.FieldStorage()
  name = form.getfirst('name', '')
  email = form.getfirst('from', '')
  message = form.getfirst('message', '')
  message = 'Name: %s\nMessage: %s' % (name, message)
  subject = 'Message from Web Site'
  Email(
      from_address = email,
      to_address = ourEmail1,
      subject = subject,
      message = message
  ).send()
  Email(
      from_address = email,
      to_address = ourEmail2,
      subject = subject,
      message = message
  ).send()
  print 'Thank you, %s, we will get back to you shortly!<br />' % (name)

This sends only the first of the two emails. Why doesn't it work to send the
second? What do?
TIA,
beno

-- 
The Logos has come to bear
http://logos.13gems.com/
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From victorsubervi at gmail.com  Tue Mar  2 10:53:10 2010
From: victorsubervi at gmail.com (Victor Subervi)
Date: Tue, 2 Mar 2010 11:53:10 -0400
Subject: Email Script
In-Reply-To: <4dc0cfea1003020748g786aded2i9c5287972aa8984c@mail.gmail.com>
References: <4dc0cfea1003020748g786aded2i9c5287972aa8984c@mail.gmail.com>
Message-ID: <4dc0cfea1003020753g404e6fbcr29ed52e21e2bb18c@mail.gmail.com>

On Tue, Mar 2, 2010 at 11:48 AM, Victor Subervi <victorsubervi at gmail.com>wrote:

> Hi;
> I have the following code:
>
> def my_mail():
>   user, passwd, db, host = login()
>   database = MySQLdb.connect(host, user, passwd, db)
>   cursor= database.cursor()
>   ourEmail1 = 'marilyn at globalsolutionsgroup.vi'
>   ourEmail1 = 'phil at globalsolutionsgroup.vi'
>   ourEmail2 = 'benoismyname at gmail.com'
>   form = cgi.FieldStorage()
>   name = form.getfirst('name', '')
>   email = form.getfirst('from', '')
>   message = form.getfirst('message', '')
>   message = 'Name: %s\nMessage: %s' % (name, message)
>   subject = 'Message from Web Site'
>   Email(
>       from_address = email,
>       to_address = ourEmail1,
>       subject = subject,
>       message = message
>   ).send()
>   Email(
>       from_address = email,
>       to_address = ourEmail2,
>       subject = subject,
>       message = message
>   ).send()
>   print 'Thank you, %s, we will get back to you shortly!<br />' % (name)
>
> This sends only the first of the two emails. Why doesn't it work to send
> the second? What do?
> TIA,
> beno
>

Should I put a timer between instances of Email?

>
>
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From steve at holdenweb.com  Tue Mar  2 11:14:37 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 02 Mar 2010 11:14:37 -0500
Subject: Adding to a module's __dict__?
In-Reply-To: <f4c188f0-7dba-4629-8a16-eed713b5920f@15g2000yqa.googlegroups.com>
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>	<mailman.96.1267508316.23598.python-list@python.org>	<roy-3CB7A4.08210202032010@news.panix.com>
	<mailman.107.1267536800.23598.python-list@python.org>
	<f4c188f0-7dba-4629-8a16-eed713b5920f@15g2000yqa.googlegroups.com>
Message-ID: <hmjdhf$f3r$1@dough.gmane.org>

Roy Smith wrote:
> On Mar 2, 8:33 am, Steve Holden <st... at holdenweb.com> wrote:
> 
>> And how important is it to make sure that whatever data your program
>> processes doesn't overwrite the actual variable names you want to use to
>> program the processing?
> 
> Oh, I see what you're saying.  You're thinking I was going to machine-
> process the C header file and pattern-match the #define statements?
> Actually, I was just hand-copying the values, and was looking for a
> way to reduce typing.
> 
> But, I suppose if I were to machine-process the header files, that
> would be a concern.  I suppose in that case I would make sure I only
> inserted variables which matched a particular pattern (ie, "[A-Z]+_[A-
> Z][A-Z0-9]+").  In fact, now that you got me thinking in that
> direction...
> 
> Somewhat sadly, in my case, I can't even machine process the header
> file.  I don't, strictly speaking, have a header file.  What I have is
> a PDF which documents what's in the header file, and I'm manually re-
> typing the data out of that.  Sigh.
> 
Don't worry. Now you have revealed the *real* problem you may well find
there are c.l.py readers who can help! Python can read PDFs ...

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From jjposner at optimum.net  Tue Mar  2 11:18:02 2010
From: jjposner at optimum.net (John Posner)
Date: Tue, 02 Mar 2010 11:18:02 -0500
Subject: Adding to a module's __dict__?
In-Reply-To: <f4c188f0-7dba-4629-8a16-eed713b5920f@15g2000yqa.googlegroups.com>
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>
	<mailman.96.1267508316.23598.python-list@python.org>
	<roy-3CB7A4.08210202032010@news.panix.com>
	<mailman.107.1267536800.23598.python-list@python.org>
	<f4c188f0-7dba-4629-8a16-eed713b5920f@15g2000yqa.googlegroups.com>
Message-ID: <4B8D3A3A.8030501@optimum.net>

On 3/2/2010 10:19 AM, Roy Smith wrote:
>
> Somewhat sadly, in my case, I can't even machine process the header
> file.  I don't, strictly speaking, have a header file.  What I have is
> a PDF which documents what's in the header file, and I'm manually re-
> typing the data out of that.  Sigh.

Here's an idea, perhaps too obvious, to minimize your keystrokes:

1. Create a text file with the essential data:

XYZ_FOO   0  The foo property
XYZ_BAR   1  The bar property
XYZ_BAZ   2  reserved for future use

2. Use a Python script to convert this into the desired code:

declare('XYZ_FOO', 0, "The foo property")
declare('XYZ_BAR', 1, "The bar property")
declare('XYZ_BAZ', 2, "reserved for future use")

Note:

 >>> s
'XYZ_FOO   0  The foo property'
 >>> s.split(None, 2)
['XYZ_FOO', '0', 'The foo property']

HTH,
John


From aahz at pythoncraft.com  Tue Mar  2 11:22:38 2010
From: aahz at pythoncraft.com (Aahz)
Date: 2 Mar 2010 08:22:38 -0800
Subject: taking python enterprise level?...
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>
	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>
	<mailman.99.1267513003.23598.python-list@python.org>
Message-ID: <hmje0e$13s$1@panix5.panix.com>

In article <mailman.99.1267513003.23598.python-list at python.org>,
D'Arcy J.M. Cain <darcy at druid.net> wrote:
>
>Put as much memory as you can afford/fit into your database server.
>It's the cheapest performance boost you can get.  If you have a serious
>application put at least 4GB into your dedicated database server.
>Swapping is your enemy.

Also, put your log/journal files on a different spindle from the database
files.  That makes a *huge* difference.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From michaelveloz at gmail.com  Tue Mar  2 11:29:04 2010
From: michaelveloz at gmail.com (Veloz)
Date: Tue, 2 Mar 2010 08:29:04 -0800 (PST)
Subject: Queue peek?
Message-ID: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>

Hi all
I'm looking for a queue that I can use with multiprocessing, which has
a peek method.

I've seen some discussion about queue.peek but don't see anything in
the docs about it.

Does python have a queue class with peek semantics?

Michael


From a_jtim at bellsouth.net  Tue Mar  2 11:31:16 2010
From: a_jtim at bellsouth.net (Tim Arnold)
Date: Tue, 2 Mar 2010 08:31:16 -0800 (PST)
Subject: freebsd and multiprocessing
Message-ID: <7cabdddf-d936-48c7-9b76-97c37def5f8f@z35g2000yqd.googlegroups.com>

Hi,
I'm intending to use multiprocessing on a freebsd machine (6.3
release, quad core, 8cpus, amd64). I see in the doc that on this
platform I can't use synchronize:

ImportError: This platform lacks a functioning sem_open
implementation, therefore, the required synchronization primitives
needed will not function, see issue 3770.

As far as I can tell, I have no need to synchronize the processes--I
have several processes run separately and I need to know when they're
all finished; there's no communication between them and each owns its
own log file for output.

Is anyone using multiprocessing on FreeBSD and run into any other
gotchas?
thanks,
--Tim Arnold


From robert.kern at gmail.com  Tue Mar  2 11:34:51 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 02 Mar 2010 10:34:51 -0600
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <hmi5ns$57b$1@dough.gmane.org>
References: <mailman.34.1267409372.23598.python-list@python.org>	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
	<hmi5ns$57b$1@dough.gmane.org>
Message-ID: <hmjena$n1p$1@dough.gmane.org>

On 2010-03-01 22:55 PM, Terry Reedy wrote:
> On 3/1/2010 7:56 PM, Patrick Maupin wrote:
>> On Mar 1, 5:57 pm, Erik Max Francis<m... at alcyone.com> wrote:
>>> Patrick Maupin wrote:
>>> This not only seriously stretching the meaning of the term "superset"
>>> (as Python is most definitely not even remotely a superset of JSON), but
>>
>> Well, you are entitled to that opinion, but seriously, if I take valid
>> JSON, replace unquoted true with True, unquoted false with False,
>> replace unquoted null with None, and take the quoted strings and
>> replace occurrences of \uXXXX with the appropriate unicode, then I do,
>> in fact, have valid Python. But don't take my word for it -- try it
>> out!
>
> To me this is so strained that I do not see why why you are arguing the
> point. So what? The resulting Python 'program' will be equivalent, I
> believe, to 'pass'. Ie, construct objects and then discard them with no
> computation or output.

Not if you eval() rather than exec(). It's reasonably well-accepted that JSON is 
very close to being a subset of Python's expression syntax with just a few 
modifications.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From robert.kern at gmail.com  Tue Mar  2 11:37:55 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 02 Mar 2010 10:37:55 -0600
Subject: Is this secure?
In-Reply-To: <hmd5v7$bir$1@panix5.panix.com>
References: <mailman.110.1266935711.4577.python-list@python.org>	<7xk4u26qz0.fsf@ruckus.brouhaha.com>
	<hm63gh$ogl$1@dough.gmane.org>	<mailman.247.1267115557.4577.python-list@python.org>
	<hmd5v7$bir$1@panix5.panix.com>
Message-ID: <hmjet2$on5$1@dough.gmane.org>

On 2010-02-28 01:28 AM, Aahz wrote:
> In article<mailman.247.1267115557.4577.python-list at python.org>,
> Robert Kern<robert.kern at gmail.com>  wrote:
>>
>> If you are storing the password instead of making your user remember
>> it, most platforms have some kind of keychain secure password
>> storage. I recommend reading up on the APIs available on your targeted
>> platforms.
>
> Are you sure?  I haven't done a lot of research, but my impression was
> that Windows didn't have anything built in.

You're right, not built-in, but Windows does provide enough crypto services for 
a cross-platform Python implementation to be built:

   http://pypi.python.org/pypi/keyring

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From pavlovevidence at gmail.com  Tue Mar  2 11:49:26 2010
From: pavlovevidence at gmail.com (Carl Banks)
Date: Tue, 2 Mar 2010 08:49:26 -0800 (PST)
Subject: Adding to a module's __dict__?
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>
	<mailman.96.1267508316.23598.python-list@python.org>
	<roy-3CB7A4.08210202032010@news.panix.com>
Message-ID: <8fa1b0d6-3f1b-4499-872c-e5854d289e9e@w27g2000pre.googlegroups.com>

On Mar 2, 5:21?am, Roy Smith <r... at panix.com> wrote:
> In article <mailman.96.1267508316.23598.python-l... at python.org>,
> ?Chris Rebert <c... at rebertia.com> wrote:
>
>
>
> > On Mon, Mar 1, 2010 at 8:27 PM, Roy Smith <r... at panix.com> wrote:
> > > >From inside a module, I want to add a key-value pair to the module's
> > > __dict__. ?I know I can just do:
>
> > > FOO = 'bar'
>
> > > at the module top-level, but I've got 'FOO' as a string and what I
> > > really need to do is
>
> > > __dict__['Foo'] = 'bar'
>
> > > When I do that, I get "NameError: name '__dict__' is not defined". ?Is
> > > it possible to do what I'm trying to do?
>
> > Yes; just modify the dict returned by the globals() built-in function
> > instead.
>
> Ah, cool. ?Thanks.
>
> > It's usually not wise to do this and is better to use a
> > separate dict instead, but I'll assume you know what you're doing and
> > have good reasons to disregard the standard advice due to your
> > use-case.
>
> Why is it unwise?


He didn't say it was unwise.  He said it's usually not wise.


Carl Banks


From philip at semanchuk.com  Tue Mar  2 11:52:13 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 2 Mar 2010 11:52:13 -0500
Subject: freebsd and multiprocessing
In-Reply-To: <7cabdddf-d936-48c7-9b76-97c37def5f8f@z35g2000yqd.googlegroups.com>
References: <7cabdddf-d936-48c7-9b76-97c37def5f8f@z35g2000yqd.googlegroups.com>
Message-ID: <21D34712-C0F0-40E5-9D62-DB867962ED8A@semanchuk.com>


On Mar 2, 2010, at 11:31 AM, Tim Arnold wrote:

> Hi,
> I'm intending to use multiprocessing on a freebsd machine (6.3
> release, quad core, 8cpus, amd64). I see in the doc that on this
> platform I can't use synchronize:
>
> ImportError: This platform lacks a functioning sem_open
> implementation, therefore, the required synchronization primitives
> needed will not function, see issue 3770.
>
> As far as I can tell, I have no need to synchronize the processes--I
> have several processes run separately and I need to know when they're
> all finished; there's no communication between them and each owns its
> own log file for output.
>
> Is anyone using multiprocessing on FreeBSD and run into any other
> gotchas?

Hi Tim,
I don't use multiprocessing but I've written two low-level IPC  
packages, one for SysV IPC and the other for POSIX IPC.

I think that multiprocessing prefers POSIX IPC (which is where  
sem_open() comes from). I don't know what it uses if that's not  
available, but SysV IPC seems a likely alternative. I must emphasize,  
however, that that's a guess on my part.

FreeBSD didn't have POSIX IPC support until 7.0, and that was sort of  
broken until 7.2. As it happens, I was testing my POSIX IPC code  
against 7.2 last night and it works just fine.

SysV IPC works under FreeBSD 6 (and perhaps earlier versions; 6 is the  
oldest I've tested). ISTR that by default each message queue is  
limited to 2048 bytes in total size. 'sysctl kern.ipc' can probably  
tell you that and may even let you change it. Other than that I can't  
think of any SysV limitations that might bite you.

HTH
Philip





From victorsubervi at gmail.com  Tue Mar  2 11:56:58 2010
From: victorsubervi at gmail.com (Victor Subervi)
Date: Tue, 2 Mar 2010 12:56:58 -0400
Subject: Email Script
In-Reply-To: <4dc0cfea1003020753g404e6fbcr29ed52e21e2bb18c@mail.gmail.com>
References: <4dc0cfea1003020748g786aded2i9c5287972aa8984c@mail.gmail.com>
	<4dc0cfea1003020753g404e6fbcr29ed52e21e2bb18c@mail.gmail.com>
Message-ID: <4dc0cfea1003020856x2146652ahaa1537d15c05c347@mail.gmail.com>

On Tue, Mar 2, 2010 at 11:53 AM, Victor Subervi <victorsubervi at gmail.com>wrote:

> On Tue, Mar 2, 2010 at 11:48 AM, Victor Subervi <victorsubervi at gmail.com>wrote:
>
>> Hi;
>> I have the following code:
>>
>> def my_mail():
>>   user, passwd, db, host = login()
>>   database = MySQLdb.connect(host, user, passwd, db)
>>   cursor= database.cursor()
>>   ourEmail1 = 'marilyn at globalsolutionsgroup.vi'
>>   ourEmail1 = 'phil at globalsolutionsgroup.vi'
>>   ourEmail2 = 'benoismyname at gmail.com'
>>   form = cgi.FieldStorage()
>>   name = form.getfirst('name', '')
>>   email = form.getfirst('from', '')
>>   message = form.getfirst('message', '')
>>   message = 'Name: %s\nMessage: %s' % (name, message)
>>   subject = 'Message from Web Site'
>>   Email(
>>       from_address = email,
>>       to_address = ourEmail1,
>>       subject = subject,
>>       message = message
>>   ).send()
>>   Email(
>>       from_address = email,
>>       to_address = ourEmail2,
>>       subject = subject,
>>       message = message
>>   ).send()
>>   print 'Thank you, %s, we will get back to you shortly!<br />' % (name)
>>
>> This sends only the first of the two emails. Why doesn't it work to send
>> the second? What do?
>> TIA,
>> beno
>>
>
> Should I put a timer between instances of Email?
>
>>
>> Adding a timer didn't work. Do I need to explicitly close the smtp
connection before sending the next email? I don't understand why there's a
problem.
TIA,
beno
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From python at mrabarnett.plus.com  Tue Mar  2 12:26:18 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 02 Mar 2010 17:26:18 +0000
Subject: Adding to a module's __dict__?
In-Reply-To: <4B8D3A3A.8030501@optimum.net>
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>	<mailman.96.1267508316.23598.python-list@python.org>	<roy-3CB7A4.08210202032010@news.panix.com>	<mailman.107.1267536800.23598.python-list@python.org>	<f4c188f0-7dba-4629-8a16-eed713b5920f@15g2000yqa.googlegroups.com>
	<4B8D3A3A.8030501@optimum.net>
Message-ID: <4B8D4A3A.90501@mrabarnett.plus.com>

John Posner wrote:
> On 3/2/2010 10:19 AM, Roy Smith wrote:
>>
>> Somewhat sadly, in my case, I can't even machine process the header
>> file.  I don't, strictly speaking, have a header file.  What I have is
>> a PDF which documents what's in the header file, and I'm manually re-
>> typing the data out of that.  Sigh.
> 
> Here's an idea, perhaps too obvious, to minimize your keystrokes:
> 
> 1. Create a text file with the essential data:
> 
> XYZ_FOO   0  The foo property
> XYZ_BAR   1  The bar property
> XYZ_BAZ   2  reserved for future use
> 
> 2. Use a Python script to convert this into the desired code:
> 
> declare('XYZ_FOO', 0, "The foo property")
> declare('XYZ_BAR', 1, "The bar property")
> declare('XYZ_BAZ', 2, "reserved for future use")
> 
> Note:
> 
>  >>> s
> 'XYZ_FOO   0  The foo property'
>  >>> s.split(None, 2)
> ['XYZ_FOO', '0', 'The foo property']
> 
You might be able to reduce your typing by copy-and-pasting the relevant
text from the PDF into an editor and then editing it.


From python at mrabarnett.plus.com  Tue Mar  2 12:32:40 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 02 Mar 2010 17:32:40 +0000
Subject: os.fdopen() issue in Python 3.1?
In-Reply-To: <1267539898.477222.7.camel@necropolis>
References: <1267539898.477222.7.camel@necropolis>
Message-ID: <4B8D4BB8.8020909@mrabarnett.plus.com>

Albert Hopkins wrote:
> I have a snippet of code that looks like this:
> 
>         pid, fd = os.forkpty()
>         if pid == 0:
>             subprocess.call(args)
>         else:
>             input = os.fdopen(fd).read()
>         ...
> 
> 
> This seems to work find for CPython 2.5 and 2.6 on my Linux system.
> However, with CPython 3.1 I get:
> 
>             input = os.fdopen(fd).read()
>         IOError: [Errno 5] Input/output error
> 
> Is there something wrong in Python 3.1?  Is this the correct way to do
> this (run a process in a pseudo-tty and read it's output) or is there
> another way I should/could be doing this?
> 
The documentation also mentions the 'pty' module. Have you tried that
instead?


From emannion at gmail.com  Tue Mar  2 12:33:39 2010
From: emannion at gmail.com (enda man)
Date: Tue, 2 Mar 2010 09:33:39 -0800 (PST)
Subject: Call Signtool using python
References: <24bf5006-db86-4415-89ec-c5eab8f1c740@x22g2000yqx.googlegroups.com>
	<mailman.112.1267541184.23598.python-list@python.org>
Message-ID: <fad4c5e6-ae70-4175-8a64-5fe74669d0b4@f35g2000yqd.googlegroups.com>

On Mar 2, 2:46?pm, "Matt Mitchell" <mmitch... at transparent.com> wrote:
> I think you need to use the /p switch to pass signtool.exe a password
> when using the /f switch.
> Check outhttp://msdn.microsoft.com/en-us/library/8s9b9yaz%28VS.80%29.aspxfor
> more info.
>
> -----------------------------------
> The information contained in this electronic message and any attached document(s) is intended only for the personal and confidential use of the designated recipients named above. This message may be confidential. If the reader of this message is not the intended recipient, you are hereby notified that you have received this document in error, and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify sender immediately by telephone (603) 262-6300 or by electronic mail immediately. Thank you.
>
> -----Original Message-----
> From: python-list-bounces+mmitchell=transparent.... at python.org
>
> [mailto:python-list-bounces+mmitchell=transparent.... at python.org] On
> Behalf Of enda man
> Sent: Tuesday, March 02, 2010 6:34 AM
> To: python-l... at python.org
> Subject: Call Signtool using python
>
> Hi,
>
> I want to call the Windows signtool to sign a binary from a python
> script.
>
> Here is my script:
> //
> os.chdir('./Install/activex/cab')
> subprocess.call(["signtool", "sign", "/v", "/f", "webph.pfx", "/t",
> "http://timestamp.verisign.com/scripts/timstamp.dll", "WebPh.exe" ])
> //
>
> But I am getting this error:
> ////
> SignTool Error: The specified PFX password is not correct.
>
> Number of files successfully Signed: 0
> Number of warnings: 0
> Number of errors: 1
> Finished building plugin installer
> scons: done building targets.
> ////
>
> This python script is called as part of a scons build, which is also
> python code.
>
> Anyone seen this before or can pass on any ideas.
> Tks,
> EM
>
> --http://mail.python.org/mailman/listinfo/python-list
>
>

The same command works when run from the command line but when I run
it from python  using subprocess.call(...) it fails as described in my
first post.  I do not need to use the /p switch as the password is
embedded in the pfx file.
That is why I think it is something I am or am not doing in python.

EM





From usenot at geekmail.INVALID  Tue Mar  2 12:35:27 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Tue, 2 Mar 2010 18:35:27 +0100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
	<mailman.78.1267477780.23598.python-list@python.org>
Message-ID: <20100302183527.47c6e8f5@geekmail.INVALID>

On Mon, 01 Mar 2010 21:09:39 +0000 Mark Lawrence
<breamoreboy at yahoo.co.uk> wrote:

> Andreas Waldenburger wrote:
> > [snip]
> > We did not buy code. If it were written in C or such, we would never
> > get to see it.
> > 
> > It's not our concern.
> > 
> > /W
> > 
> 
>  From your original post.
> 
> <quote>
> a company that works with my company writes a lot of of their code in
> Python (lucky jerks). I've seen their code and it basically looks like
> this:
> </quote>
> 
> So what is the relationship between your company and this other
> company?
They write a piece of software that we run as a component in a software
ecosystem that we (and others) have developed.


> When it gets down to pounds, shillings and pence (gosh, I'm
> old!:) it sure as hell could make a tremendous difference in the long
> term, given that usually maintainance costs are astronomical when
> compared to initial development costs.
> 
I totally agree, but as long as their software works, why should we
care how their code looks? It's totally their responsibility. Why
should we nanny every partner we have?

Don't get me wrong; our whole system is more fragile than I find
comfortable. But I guess getting 10ish different parties around the
globe to work in complete unison is quite a feat, and I'm surprised it
even works as it is. But it does, and I'm glad we don't have to
micromanage other people's code.


/W


-- 
INVALID? DE!



From tjreedy at udel.edu  Tue Mar  2 12:38:55 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 02 Mar 2010 12:38:55 -0500
Subject: Adding to a module's __dict__?
In-Reply-To: <4B8D3A3A.8030501@optimum.net>
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>	<mailman.96.1267508316.23598.python-list@python.org>	<roy-3CB7A4.08210202032010@news.panix.com>	<mailman.107.1267536800.23598.python-list@python.org>	<f4c188f0-7dba-4629-8a16-eed713b5920f@15g2000yqa.googlegroups.com>
	<4B8D3A3A.8030501@optimum.net>
Message-ID: <hmjifd$ju3$1@dough.gmane.org>

On 3/2/2010 11:18 AM, John Posner wrote:
> On 3/2/2010 10:19 AM, Roy Smith wrote:
>>
>> Somewhat sadly, in my case, I can't even machine process the header
>> file. I don't, strictly speaking, have a header file. What I have is
>> a PDF which documents what's in the header file, and I'm manually re-
>> typing the data out of that. Sigh.

There are Python modules to read/write pdf.

> Here's an idea, perhaps too obvious, to minimize your keystrokes:
>
> 1. Create a text file with the essential data:
>
> XYZ_FOO 0 The foo property
> XYZ_BAR 1 The bar property
> XYZ_BAZ 2 reserved for future use
>
> 2. Use a Python script to convert this into the desired code:
>
> declare('XYZ_FOO', 0, "The foo property")
> declare('XYZ_BAR', 1, "The bar property")
> declare('XYZ_BAZ', 2, "reserved for future use")
>
> Note:
>
>  >>> s
> 'XYZ_FOO 0 The foo property'
>  >>> s.split(None, 2)
> ['XYZ_FOO', '0', 'The foo property']

Given that set of triples is constant, I would think about having the 
Python script do the computation just once, instead of with every 
inport. In other words, the script should *call* the declare function 
and then write out the resulting set of dicts either to a .py or pickle 
file.

tjr




From usenot at geekmail.INVALID  Tue Mar  2 12:40:56 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Tue, 2 Mar 2010 18:40:56 +0100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
	<87eik3zmi8.fsf@benfinney.id.au>
Message-ID: <20100302184056.743a71e7@geekmail.INVALID>

On Tue, 02 Mar 2010 09:48:47 +1100 Ben Finney
<ben+python at benfinney.id.au> wrote:

> > It's not our concern.  
> 
> Then I don't see what that problem is.

There is none. I was griping about how stupid they are. That is a
personal problem I have with their *code* (not software), and I thought
I'd just share my superiority complex with everyone.

I had hoped that everyone just read it, went like "Oh geez.", smiled it
off with a hint of lesson learned and got back to whatever it was they
were doing. Alas, I was wrong ... and I'm sorry.

/W

-- 
INVALID? DE!



From affdfsdfdsfsd at b.com  Tue Mar  2 12:46:12 2010
From: affdfsdfdsfsd at b.com (Tracubik)
Date: 02 Mar 2010 17:46:12 GMT
Subject: case do problem
Message-ID: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>

hi, i've to convert from Pascal this code:

iterations=0;
count=0;
REPEAT;
  iterations = iterations+1;
  ...
  IF (genericCondition) THEN count=count+1;
  ...
  CASE count OF:
	1: m = 1
        2: m = 10
        3: m = 100
UNTIL count = 4 OR iterations = 20

i do something like this:

iterations = 0
count = 0

m_Switch = (1,10,100)

while True:
	iterations +=1
	...
	if (genericCondition):
		count +=1
	...
	try:
		m = m_Switch[count-1]
	except: pass
	if count = 4 or iterations = 20

the problem is that when count = 4 m_Switch[4-1] have no value, so i use 
the try..except.

Is there a better solution to solve this problem? and, generally 
speaking, the try..except block slow down the execution of the program or 
not?

Thank you in advance
Nico
	


From mrkafk at gmail.com  Tue Mar  2 12:46:22 2010
From: mrkafk at gmail.com (mk)
Date: Tue, 02 Mar 2010 18:46:22 +0100
Subject: conditional import into global namespace
Message-ID: <hmjita$ms4$1@dough.gmane.org>

Hello everyone,

I have a class that is dependent on subprocess functionality. I would 
like to make it self-contained in the sense that it would import 
subprocess if it's not imported yet.

What is the best way to proceed with this?

I see a few possibilities:

1. do a class level import, like:

class TimeSync(object):

     import subprocess


2. do an import in init, which is worse bc it's ran every time an 
instance is created:

     def __init__(self, shiftsec, ntpserver):
         import subprocess


Both of those methods have disadvantage in this context, though: they 
create 'subprocess' namespace in a class or instance, respectively.

Is there anyway to make it a global import?

Regards,
mk



From invalid at invalid.invalid  Tue Mar  2 12:46:52 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Tue, 2 Mar 2010 17:46:52 +0000 (UTC)
Subject: Broken references in postings
Message-ID: <hmjiuc$7pk$1@reader1.panix.com>

I've noticed recently that a lot of the "refernces" and
"in-reply-to" headers in c.l.p are broken, resulting in the
inability to move from a child to a parent in a tree.

For example in a recent reply (subejct: os.fdopen() issue in
Python 3.1?), the references and in-reply-to headers both
contained:

  1267539898.477222.7.camel at necropolis

However, the article replied to has a message-ID header of 

  mailman.110.1267539885.23598.python-list at python.org

I don't see 1267539898.477222.7.camel at necropolis anywhere in
the headers of the referrant.

Is something broken in the mail<->news gateway?

Or is it just individual news/mail clients that are broken?

-- 
Grant Edwards               grant.b.edwards        Yow! I own seven-eighths of
                                  at               all the artists in downtown
                              gmail.com            Burbank!


From affdfsdfdsfsd at b.com  Tue Mar  2 12:50:45 2010
From: affdfsdfdsfsd at b.com (Tracubik)
Date: 02 Mar 2010 17:50:45 GMT
Subject: case do problem
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
Message-ID: <4b8d4ff5$0$1132$4fafbaef@reader1.news.tin.it>

additional information:

when count=4 i haven't to change the m value, so i have to do nothing or 
something like m = m

Nico


From tjreedy at udel.edu  Tue Mar  2 12:59:00 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 02 Mar 2010 12:59:00 -0500
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <hmjena$n1p$1@dough.gmane.org>
References: <mailman.34.1267409372.23598.python-list@python.org>	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>	<hmi5ns$57b$1@dough.gmane.org>
	<hmjena$n1p$1@dough.gmane.org>
Message-ID: <hmjjl2$r4m$1@dough.gmane.org>

On 3/2/2010 11:34 AM, Robert Kern wrote:
> On 2010-03-01 22:55 PM, Terry Reedy wrote:
>> On 3/1/2010 7:56 PM, Patrick Maupin wrote:
>>> On Mar 1, 5:57 pm, Erik Max Francis<m... at alcyone.com> wrote:
>>>> Patrick Maupin wrote:
>>>> This not only seriously stretching the meaning of the term "superset"
>>>> (as Python is most definitely not even remotely a superset of JSON),
>>>> but
>>>
>>> Well, you are entitled to that opinion, but seriously, if I take valid
>>> JSON, replace unquoted true with True, unquoted false with False,
>>> replace unquoted null with None, and take the quoted strings and
>>> replace occurrences of \uXXXX with the appropriate unicode, then I do,
>>> in fact, have valid Python. But don't take my word for it -- try it
>>> out!
>>
>> To me this is so strained that I do not see why why you are arguing the
>> point. So what? The resulting Python 'program' will be equivalent, I
>> believe, to 'pass'. Ie, construct objects and then discard them with no
>> computation or output.
>
> Not if you eval() rather than exec().

 >>> eval(1)

creates and objects and discards it, with a net result of 'pass'.
What do you think I am missing.

It's reasonably well-accepted that
> JSON is very close to being a subset of Python's expression syntax with
> just a few modifications.

It is specifically JavaScript Object Notation, which is very similar to 
a subset of Python's object notation (number and string literals and 
list and dict displays (but not set displays), and three named 
constants). Without operators, it barely qualifies, to me, even as 
'expression syntax'.

To me, comparing object notation with programming language is not 
helpful to the OP's purpose. His main claim is that JSON can be usefully 
extended but that YAML is too much, so that perhaps he, with help, can 
find a 'sweet spot' in between.

Terry Jan Reedy






From a_jtim at bellsouth.net  Tue Mar  2 12:59:10 2010
From: a_jtim at bellsouth.net (Tim Arnold)
Date: Tue, 2 Mar 2010 09:59:10 -0800 (PST)
Subject: freebsd and multiprocessing
References: <7cabdddf-d936-48c7-9b76-97c37def5f8f@z35g2000yqd.googlegroups.com>
	<mailman.121.1267548737.23598.python-list@python.org>
Message-ID: <5c8d7d72-710a-41c1-897e-8d5605c61373@e7g2000yqf.googlegroups.com>

On Mar 2, 11:52?am, Philip Semanchuk <phi... at semanchuk.com> wrote:
> On Mar 2, 2010, at 11:31 AM, Tim Arnold wrote:
>
>
>
>
>
> > Hi,
> > I'm intending to use multiprocessing on a freebsd machine (6.3
> > release, quad core, 8cpus, amd64). I see in the doc that on this
> > platform I can't use synchronize:
>
> > ImportError: This platform lacks a functioning sem_open
> > implementation, therefore, the required synchronization primitives
> > needed will not function, see issue 3770.
>
> > As far as I can tell, I have no need to synchronize the processes--I
> > have several processes run separately and I need to know when they're
> > all finished; there's no communication between them and each owns its
> > own log file for output.
>
> > Is anyone using multiprocessing on FreeBSD and run into any other
> > gotchas?
>
> Hi Tim,
> I don't use multiprocessing but I've written two low-level IPC ?
> packages, one for SysV IPC and the other for POSIX IPC.
>
> I think that multiprocessing prefers POSIX IPC (which is where ?
> sem_open() comes from). I don't know what it uses if that's not ?
> available, but SysV IPC seems a likely alternative. I must emphasize, ?
> however, that that's a guess on my part.
>
> FreeBSD didn't have POSIX IPC support until 7.0, and that was sort of ?
> broken until 7.2. As it happens, I was testing my POSIX IPC code ?
> against 7.2 last night and it works just fine.
>
> SysV IPC works under FreeBSD 6 (and perhaps earlier versions; 6 is the ?
> oldest I've tested). ISTR that by default each message queue is ?
> limited to 2048 bytes in total size. 'sysctl kern.ipc' can probably ?
> tell you that and may even let you change it. Other than that I can't ?
> think of any SysV limitations that might bite you.
>
> HTH
> Philip

Hi Philip,
Thanks for that information. I wish I could upgrade the machine to
7.2! alas, out of my power.  I get the following results from sysctl:
% sysctl kern.ipc | grep msg
kern.ipc.msgseg: 2048
kern.ipc.msgssz: 8
kern.ipc.msgtql: 40
kern.ipc.msgmnb: 2048
kern.ipc.msgmni: 40
kern.ipc.msgmax: 16384

I'll write some test programs using multiprocessing and see how they
go before committing to rewrite my current code. I've also been
looking at 'parallel python' although it may have the same issues.
http://www.parallelpython.com/

thanks again,
--Tim


From clp2 at rebertia.com  Tue Mar  2 12:59:22 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 2 Mar 2010 09:59:22 -0800
Subject: Call Signtool using python
In-Reply-To: <24bf5006-db86-4415-89ec-c5eab8f1c740@x22g2000yqx.googlegroups.com>
References: <24bf5006-db86-4415-89ec-c5eab8f1c740@x22g2000yqx.googlegroups.com>
Message-ID: <50697b2c1003020959g33d31d45ge1a7b7986b7e5a45@mail.gmail.com>

On Tue, Mar 2, 2010 at 3:34 AM, enda man <emannion at gmail.com> wrote:
> Hi,
>
> I want to call the Windows signtool to sign a binary from a python
> script.
>
> Here is my script:
> //
> os.chdir('./Install/activex/cab')
> subprocess.call(["signtool", "sign", "/v", "/f", "webph.pfx", "/t",
> "http://timestamp.verisign.com/scripts/timstamp.dll", "WebPh.exe" ])
> //
>
> But I am getting this error:
> ////
> SignTool Error: The specified PFX password is not correct.
>
> Number of files successfully Signed: 0
> Number of warnings: 0
> Number of errors: 1
> Finished building plugin installer
> scons: done building targets.
> ////
>
>
> This python script is called as part of a scons build, which is also
> python code.
>
> Anyone seen this before or can pass on any ideas.

Nothing looks obviously wrong (though I'm unfamiliar with signtool).
Have you tried specifying an absolute path to webph.pfx?

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


From alfps at start.no  Tue Mar  2 13:00:09 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Tue, 02 Mar 2010 19:00:09 +0100
Subject: case do problem
In-Reply-To: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
Message-ID: <hmjjnn$arj$1@news.eternal-september.org>

* Tracubik:
> hi, i've to convert from Pascal this code:
> 
> iterations=0;
> count=0;
> REPEAT;
>   iterations = iterations+1;
>   ...
>   IF (genericCondition) THEN count=count+1;
>   ...
>   CASE count OF:
> 	1: m = 1
>         2: m = 10
>         3: m = 100

Uhm, is this syntactically valid Pascal? As I recall, every Pascal construct was 
delimited in some way. Once I had the complete Pascal syntax in my head, but 
alas, not anymore...


> UNTIL count = 4 OR iterations = 20
> 
> i do something like this:
> 
> iterations = 0
> count = 0
> 
> m_Switch = (1,10,100)
> 
> while True:
> 	iterations +=1
> 	...
> 	if (genericCondition):
> 		count +=1
> 	...
> 	try:
> 		m = m_Switch[count-1]
> 	except: pass
> 	if count = 4 or iterations = 20
> 
> the problem is that when count = 4 m_Switch[4-1] have no value, so i use 
> the try..except.

   iterations = 0
   count = 0
   while not( count == 4 or iterations == 20 ):
       iterations += 1
       # ...
       if generic_condition:
           count += 1
       # ...
       m = (1, 10, 100, 100)[count]


> Is there a better solution to solve this problem?

Define "better". Do you mean faster, more clear, shorter, using less memory, what?

Above I've assumed that you want to get rid of the try block, since that's what 
you're asking about:


> and, generally 
> speaking, the try..except block slow down the execution of the program or 
> not?

Probably, but don't think about it. Python programming is at a level where that 
kind of efficiency doesn't count. Or, ideally it shouldn't count.


Cheers & hth.,

- Alf


From alfps at start.no  Tue Mar  2 13:01:36 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Tue, 02 Mar 2010 19:01:36 +0100
Subject: case do problem
In-Reply-To: <hmjjnn$arj$1@news.eternal-september.org>
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
	<hmjjnn$arj$1@news.eternal-september.org>
Message-ID: <hmjjq1$arj$2@news.eternal-september.org>

* Alf P. Steinbach:
> * Tracubik:
>> hi, i've to convert from Pascal this code:
>>
>> iterations=0;
>> count=0;
>> REPEAT;
>>   iterations = iterations+1;
>>   ...
>>   IF (genericCondition) THEN count=count+1;
>>   ...
>>   CASE count OF:
>>     1: m = 1
>>         2: m = 10
>>         3: m = 100
> 
> Uhm, is this syntactically valid Pascal? As I recall, every Pascal 
> construct was delimited in some way. Once I had the complete Pascal 
> syntax in my head, but alas, not anymore...
> 
> 
>> UNTIL count = 4 OR iterations = 20
>>
>> i do something like this:
>>
>> iterations = 0
>> count = 0
>>
>> m_Switch = (1,10,100)
>>
>> while True:
>>     iterations +=1
>>     ...
>>     if (genericCondition):
>>         count +=1
>>     ...
>>     try:
>>         m = m_Switch[count-1]
>>     except: pass
>>     if count = 4 or iterations = 20
>>
>> the problem is that when count = 4 m_Switch[4-1] have no value, so i 
>> use the try..except.
> 
>   iterations = 0
>   count = 0
>   while not( count == 4 or iterations == 20 ):
>       iterations += 1
>       # ...
>       if generic_condition:
>           count += 1
>       # ...
>       m = (1, 10, 100, 100)[count]

Add one extra 100 there.


>> Is there a better solution to solve this problem?
> 
> Define "better". Do you mean faster, more clear, shorter, using less 
> memory, what?
> 
> Above I've assumed that you want to get rid of the try block, since 
> that's what you're asking about:
> 
> 
>> and, generally speaking, the try..except block slow down the execution 
>> of the program or not?
> 
> Probably, but don't think about it. Python programming is at a level 
> where that kind of efficiency doesn't count. Or, ideally it shouldn't 
> count.
> 
> 
> Cheers & hth.,
> 
> - Alf


From alfps at start.no  Tue Mar  2 13:04:21 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Tue, 02 Mar 2010 19:04:21 +0100
Subject: case do problem
In-Reply-To: <hmjjq1$arj$2@news.eternal-september.org>
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
	<hmjjnn$arj$1@news.eternal-september.org>
	<hmjjq1$arj$2@news.eternal-september.org>
Message-ID: <hmjjv6$arj$3@news.eternal-september.org>

* Alf P. Steinbach:
> * Alf P. Steinbach:
>> * Tracubik:
>>> hi, i've to convert from Pascal this code:
>>>
>>> iterations=0;
>>> count=0;
>>> REPEAT;
>>>   iterations = iterations+1;
>>>   ...
>>>   IF (genericCondition) THEN count=count+1;
>>>   ...
>>>   CASE count OF:
>>>     1: m = 1
>>>         2: m = 10
>>>         3: m = 100
>>
>> Uhm, is this syntactically valid Pascal? As I recall, every Pascal 
>> construct was delimited in some way. Once I had the complete Pascal 
>> syntax in my head, but alas, not anymore...
>>
>>
>>> UNTIL count = 4 OR iterations = 20
>>>
>>> i do something like this:
>>>
>>> iterations = 0
>>> count = 0
>>>
>>> m_Switch = (1,10,100)
>>>
>>> while True:
>>>     iterations +=1
>>>     ...
>>>     if (genericCondition):
>>>         count +=1
>>>     ...
>>>     try:
>>>         m = m_Switch[count-1]
>>>     except: pass
>>>     if count = 4 or iterations = 20
>>>
>>> the problem is that when count = 4 m_Switch[4-1] have no value, so i 
>>> use the try..except.
>>
>>   iterations = 0
>>   count = 0
>>   while not( count == 4 or iterations == 20 ):
>>       iterations += 1
>>       # ...
>>       if generic_condition:
>>           count += 1
>>       # ...
>>       m = (1, 10, 100, 100)[count]
> 
> Add one extra 100 there.

Oh dear, it's one of those days.

    if 1 <= count <= 3:
        m = (1, 10, 100)[count - 1]


>>> Is there a better solution to solve this problem?
>>
>> Define "better". Do you mean faster, more clear, shorter, using less 
>> memory, what?
>>
>> Above I've assumed that you want to get rid of the try block, since 
>> that's what you're asking about:
>>
>>
>>> and, generally speaking, the try..except block slow down the 
>>> execution of the program or not?
>>
>> Probably, but don't think about it. Python programming is at a level 
>> where that kind of efficiency doesn't count. Or, ideally it shouldn't 
>> count.
>>
>>
>> Cheers & hth.,
>>
>> - Alf


From jeanmichel at sequans.com  Tue Mar  2 13:05:25 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Tue, 02 Mar 2010 19:05:25 +0100
Subject: Docstrings considered too complicated
In-Reply-To: <20100302184056.743a71e7@geekmail.INVALID>
References: <20100224212303.242222c6@geekmail.INVALID>	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>	<20100227191040.6c77f2d8@geekmail.INVALID>	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>	<20100301140943.4edca16b@geekmail.INVALID>	<4b8be8f7$1@dnews.tpgi.com.au>	<20100301182255.3de59bc6@geekmail.INVALID>	<mailman.66.1267465347.23598.python-list@python.org>	<20100301212954.7aa0b99d@geekmail.INVALID>	<87eik3zmi8.fsf@benfinney.id.au>
	<20100302184056.743a71e7@geekmail.INVALID>
Message-ID: <4B8D5365.9060502@sequans.com>

Andreas Waldenburger wrote:
> On Tue, 02 Mar 2010 09:48:47 +1100 Ben Finney
> <ben+python at benfinney.id.au> wrote:
>
>   
>>> It's not our concern.  
>>>       
>> Then I don't see what that problem is.
>>     
>
> There is none. I was griping about how stupid they are. That is a
> personal problem I have with their *code* (not software), and I thought
> I'd just share my superiority complex with everyone.
>
> I had hoped that everyone just read it, went like "Oh geez.", smiled it
> off with a hint of lesson learned and got back to whatever it was they
> were doing. Alas, I was wrong ... and I'm sorry.
>
> /W
>
>   
There's something wrong saying that stupid people write working code 
that totally satisfies your needs. Don't you agree ? ;-)

JM


From python at rcn.com  Tue Mar  2 13:18:54 2010
From: python at rcn.com (Raymond Hettinger)
Date: Tue, 2 Mar 2010 10:18:54 -0800 (PST)
Subject: Queue peek?
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>
Message-ID: <b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>

On Mar 2, 8:29?am, Veloz <michaelve... at gmail.com> wrote:
> Hi all
> I'm looking for a queue that I can use with multiprocessing, which has
> a peek method.
>
> I've seen some discussion about queue.peek but don't see anything in
> the docs about it.
>
> Does python have a queue class with peek semantics?

Am curious about your use case?  Why peek at something
that could be gone by the time you want to use it.

  val = q.peek()
  if something_i_want(val):
       v2 = q.get()         # this could be different than val

Wouldn't it be better to just get() the value and return if you don't
need it?

  val = q.peek()
  if not something_i_want(val):
      q.put(val)


Raymond





From python at mrabarnett.plus.com  Tue Mar  2 13:21:02 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 02 Mar 2010 18:21:02 +0000
Subject: conditional import into global namespace
In-Reply-To: <hmjita$ms4$1@dough.gmane.org>
References: <hmjita$ms4$1@dough.gmane.org>
Message-ID: <4B8D570E.5070804@mrabarnett.plus.com>

mk wrote:
> Hello everyone,
> 
> I have a class that is dependent on subprocess functionality. I would 
> like to make it self-contained in the sense that it would import 
> subprocess if it's not imported yet.
> 
> What is the best way to proceed with this?
> 
> I see a few possibilities:
> 
> 1. do a class level import, like:
> 
> class TimeSync(object):
> 
>     import subprocess
> 
> 
> 2. do an import in init, which is worse bc it's ran every time an 
> instance is created:
> 
>     def __init__(self, shiftsec, ntpserver):
>         import subprocess
> 
> 
> Both of those methods have disadvantage in this context, though: they 
> create 'subprocess' namespace in a class or instance, respectively.
> 
> Is there anyway to make it a global import?
> 
The simplest solution is just import it at the top of the module.


From tjreedy at udel.edu  Tue Mar  2 13:25:16 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 02 Mar 2010 13:25:16 -0500
Subject: os.fdopen() issue in Python 3.1?
In-Reply-To: <1267539898.477222.7.camel@necropolis>
References: <1267539898.477222.7.camel@necropolis>
Message-ID: <hmjl6a$230$1@dough.gmane.org>

On 3/2/2010 9:24 AM, Albert Hopkins wrote:
> I have a snippet of code that looks like this:
>
>          pid, fd = os.forkpty()
>          if pid == 0:
>              subprocess.call(args)
>          else:
>              input = os.fdopen(fd).read()
>          ...
>
>
> This seems to work find for CPython 2.5 and 2.6 on my Linux system.

To get help, or report a bug, for something like this, be as specific as 
possible. 'Linux' may be too generic.

> However, with CPython 3.1 I get:
>
>              input = os.fdopen(fd).read()
>          IOError: [Errno 5] Input/output error
>
> Is there something wrong in Python 3.1?  Is this the correct way to do
> this (run a process in a pseudo-tty and read it's output) or is there
> another way I should/could be doing this?

No idea, however, the first thing I would do is call the .fdopen and 
.read methods separately (on separate lines) to isolate which is raising 
the error.

tjr





From python at mrabarnett.plus.com  Tue Mar  2 13:26:08 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 02 Mar 2010 18:26:08 +0000
Subject: case do problem
In-Reply-To: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
Message-ID: <4B8D5840.4070601@mrabarnett.plus.com>

Tracubik wrote:
> hi, i've to convert from Pascal this code:
> 
> iterations=0;
> count=0;
> REPEAT;
>   iterations = iterations+1;
>   ...
>   IF (genericCondition) THEN count=count+1;
>   ...
>   CASE count OF:
> 	1: m = 1
>         2: m = 10
>         3: m = 100
> UNTIL count = 4 OR iterations = 20
> 
> i do something like this:
> 
> iterations = 0
> count = 0
> 
> m_Switch = (1,10,100)
> 
> while True:
> 	iterations +=1
> 	...
> 	if (genericCondition):
> 		count +=1
> 	...
> 	try:
> 		m = m_Switch[count-1]
> 	except: pass
> 	if count = 4 or iterations = 20
> 
> the problem is that when count = 4 m_Switch[4-1] have no value, so i use 
> the try..except.
> 
> Is there a better solution to solve this problem? and, generally 
> speaking, the try..except block slow down the execution of the program or 
> not?
> 
Use a dict:

     m_Switch = {1: 1, 2: 10, 3: 100}

and then catch the KeyError.

Don't use a bare 'except', catch the specific exception you want to
catch, and don't worry about the speed unless you discover that it's
real problem.


From malaclypse2 at gmail.com  Tue Mar  2 13:31:13 2010
From: malaclypse2 at gmail.com (Jerry Hill)
Date: Tue, 2 Mar 2010 13:31:13 -0500
Subject: conditional import into global namespace
In-Reply-To: <hmjita$ms4$1@dough.gmane.org>
References: <hmjita$ms4$1@dough.gmane.org>
Message-ID: <16651e81003021031h3831d4b3i844f331f3d301042@mail.gmail.com>

On Tue, Mar 2, 2010 at 12:46 PM, mk <mrkafk at gmail.com> wrote:
> Hello everyone,
>
> I have a class that is dependent on subprocess functionality. I would like
> to make it self-contained in the sense that it would import subprocess if
> it's not imported yet.
>
> What is the best way to proceed with this?

Just import subprocess at the top of your module.  If subprocess
hasn't been imported yet, it will be imported when your module is
loaded.  If it's already been imported, your module will use the
cached version that's already been imported.

In other words, it sounds like Python already does what you want.  You
don't need to do anything special.

-- 
Jerry


From a_jtim at bellsouth.net  Tue Mar  2 13:31:50 2010
From: a_jtim at bellsouth.net (Tim Arnold)
Date: Tue, 2 Mar 2010 10:31:50 -0800 (PST)
Subject: freebsd and multiprocessing
References: <7cabdddf-d936-48c7-9b76-97c37def5f8f@z35g2000yqd.googlegroups.com>
	<mailman.121.1267548737.23598.python-list@python.org>
	<5c8d7d72-710a-41c1-897e-8d5605c61373@e7g2000yqf.googlegroups.com>
Message-ID: <4079148c-3690-4c24-b3db-79f685bf8eab@q15g2000yqj.googlegroups.com>

On Mar 2, 12:59?pm, Tim Arnold <a_j... at bellsouth.net> wrote:
> On Mar 2, 11:52?am, Philip Semanchuk <phi... at semanchuk.com> wrote:
> > On Mar 2, 2010, at 11:31 AM, Tim Arnold wrote:
>
> > > Hi,
> > > I'm intending to use multiprocessing on a freebsd machine (6.3
> > > release, quad core, 8cpus, amd64). I see in the doc that on this
> > > platform I can't use synchronize:
>
> > > ImportError: This platform lacks a functioning sem_open
> > > implementation, therefore, the required synchronization primitives
> > > needed will not function, see issue 3770.
>
> > > As far as I can tell, I have no need to synchronize the processes--I
> > > have several processes run separately and I need to know when they're
> > > all finished; there's no communication between them and each owns its
> > > own log file for output.
>
> > > Is anyone using multiprocessing on FreeBSD and run into any other
> > > gotchas?
>
> > Hi Tim,
> > I don't use multiprocessing but I've written two low-level IPC ?
> > packages, one for SysV IPC and the other for POSIX IPC.
>
> > I think that multiprocessing prefers POSIX IPC (which is where ?
> > sem_open() comes from). I don't know what it uses if that's not ?
> > available, but SysV IPC seems a likely alternative. I must emphasize, ?
> > however, that that's a guess on my part.
>
> > FreeBSD didn't have POSIX IPC support until 7.0, and that was sort of ?
> > broken until 7.2. As it happens, I was testing my POSIX IPC code ?
> > against 7.2 last night and it works just fine.
>
> > SysV IPC works under FreeBSD 6 (and perhaps earlier versions; 6 is the ?
> > oldest I've tested). ISTR that by default each message queue is ?
> > limited to 2048 bytes in total size. 'sysctl kern.ipc' can probably ?
> > tell you that and may even let you change it. Other than that I can't ?
> > think of any SysV limitations that might bite you.
>
> > HTH
> > Philip
>
> Hi Philip,
> Thanks for that information. I wish I could upgrade the machine to
> 7.2! alas, out of my power. ?I get the following results from sysctl:
> % sysctl kern.ipc | grep msg
> kern.ipc.msgseg: 2048
> kern.ipc.msgssz: 8
> kern.ipc.msgtql: 40
> kern.ipc.msgmnb: 2048
> kern.ipc.msgmni: 40
> kern.ipc.msgmax: 16384
>
> I'll write some test programs using multiprocessing and see how they
> go before committing to rewrite my current code. I've also been
> looking at 'parallel python' although it may have the same issues.http://www.parallelpython.com/
>
> thanks again,
> --Tim

Well that didn't work out well. I can't import either Queue or Pool
from multiprocessing, so I'm back to the drawing board. I'll see now
how parallel python does on freebsd.

--Tim



From mrkafk at gmail.com  Tue Mar  2 13:33:31 2010
From: mrkafk at gmail.com (mk)
Date: Tue, 02 Mar 2010 19:33:31 +0100
Subject: Email Script
In-Reply-To: <4dc0cfea1003020856x2146652ahaa1537d15c05c347@mail.gmail.com>
References: <4dc0cfea1003020748g786aded2i9c5287972aa8984c@mail.gmail.com>	<4dc0cfea1003020753g404e6fbcr29ed52e21e2bb18c@mail.gmail.com>
	<4dc0cfea1003020856x2146652ahaa1537d15c05c347@mail.gmail.com>
Message-ID: <hmjlln$373$1@dough.gmane.org>


Where do you take class Email from? There's no info in your mail on this.

Regards,
mk



From victorsubervi at gmail.com  Tue Mar  2 13:37:43 2010
From: victorsubervi at gmail.com (Victor Subervi)
Date: Tue, 2 Mar 2010 14:37:43 -0400
Subject: Email Script
In-Reply-To: <4dc0cfea1003020856x2146652ahaa1537d15c05c347@mail.gmail.com>
References: <4dc0cfea1003020748g786aded2i9c5287972aa8984c@mail.gmail.com>
	<4dc0cfea1003020753g404e6fbcr29ed52e21e2bb18c@mail.gmail.com>
	<4dc0cfea1003020856x2146652ahaa1537d15c05c347@mail.gmail.com>
Message-ID: <4dc0cfea1003021037wb1a60a0y8966e00489954f48@mail.gmail.com>

On Tue, Mar 2, 2010 at 12:56 PM, Victor Subervi <victorsubervi at gmail.com>wrote:

> On Tue, Mar 2, 2010 at 11:53 AM, Victor Subervi <victorsubervi at gmail.com>wrote:
>
>> On Tue, Mar 2, 2010 at 11:48 AM, Victor Subervi <victorsubervi at gmail.com>wrote:
>>
>>> Hi;
>>> I have the following code:
>>>
>>> def my_mail():
>>>   user, passwd, db, host = login()
>>>   database = MySQLdb.connect(host, user, passwd, db)
>>>   cursor= database.cursor()
>>>   ourEmail1 = 'marilyn at globalsolutionsgroup.vi'
>>>   ourEmail1 = 'phil at globalsolutionsgroup.vi'
>>>   ourEmail2 = 'benoismyname at gmail.com'
>>>   form = cgi.FieldStorage()
>>>   name = form.getfirst('name', '')
>>>   email = form.getfirst('from', '')
>>>   message = form.getfirst('message', '')
>>>   message = 'Name: %s\nMessage: %s' % (name, message)
>>>   subject = 'Message from Web Site'
>>>   Email(
>>>       from_address = email,
>>>       to_address = ourEmail1,
>>>       subject = subject,
>>>       message = message
>>>   ).send()
>>>   Email(
>>>       from_address = email,
>>>       to_address = ourEmail2,
>>>       subject = subject,
>>>       message = message
>>>   ).send()
>>>   print 'Thank you, %s, we will get back to you shortly!<br />' % (name)
>>>
>>> This sends only the first of the two emails. Why doesn't it work to send
>>> the second? What do?
>>> TIA,
>>> beno
>>>
>>
>> Should I put a timer between instances of Email?
>>
>>>
>>> Adding a timer didn't work. Do I need to explicitly close the smtp
> connection before sending the next email? I don't understand why there's a
> problem.
> TIA,
> beno
>

Seems like the problem was I had to import simplemail for each of the
my_email functions.
beno

-- 
The Logos has come to bear
http://logos.13gems.com/
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From robert.kern at gmail.com  Tue Mar  2 13:39:10 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 02 Mar 2010 12:39:10 -0600
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <hmjjl2$r4m$1@dough.gmane.org>
References: <mailman.34.1267409372.23598.python-list@python.org>	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>	<hmi5ns$57b$1@dough.gmane.org>	<hmjena$n1p$1@dough.gmane.org>
	<hmjjl2$r4m$1@dough.gmane.org>
Message-ID: <hmjm0e$53r$1@dough.gmane.org>

On 2010-03-02 11:59 AM, Terry Reedy wrote:
> On 3/2/2010 11:34 AM, Robert Kern wrote:
>> On 2010-03-01 22:55 PM, Terry Reedy wrote:
>>> On 3/1/2010 7:56 PM, Patrick Maupin wrote:
>>>> On Mar 1, 5:57 pm, Erik Max Francis<m... at alcyone.com> wrote:
>>>>> Patrick Maupin wrote:
>>>>> This not only seriously stretching the meaning of the term "superset"
>>>>> (as Python is most definitely not even remotely a superset of JSON),
>>>>> but
>>>>
>>>> Well, you are entitled to that opinion, but seriously, if I take valid
>>>> JSON, replace unquoted true with True, unquoted false with False,
>>>> replace unquoted null with None, and take the quoted strings and
>>>> replace occurrences of \uXXXX with the appropriate unicode, then I do,
>>>> in fact, have valid Python. But don't take my word for it -- try it
>>>> out!
>>>
>>> To me this is so strained that I do not see why why you are arguing the
>>> point. So what? The resulting Python 'program' will be equivalent, I
>>> believe, to 'pass'. Ie, construct objects and then discard them with no
>>> computation or output.
>>
>> Not if you eval() rather than exec().
>
>  >>> eval(1)
>
> creates and objects and discards it, with a net result of 'pass'.
> What do you think I am missing.

x = eval('1')

> It's reasonably well-accepted that
>> JSON is very close to being a subset of Python's expression syntax with
>> just a few modifications.
>
> It is specifically JavaScript Object Notation, which is very similar to
> a subset of Python's object notation (number and string literals and
> list and dict displays (but not set displays), and three named
> constants). Without operators, it barely qualifies, to me, even as
> 'expression syntax'.

Literal expression syntax, then.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From albert at spenarnc.xs4all.nl  Tue Mar  2 13:48:59 2010
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 02 Mar 2010 18:48:59 GMT
Subject: Writing an assembler in Python
References: <Xns9D28186AF890Cfdnbgui7uhu5h8hrnuio@127.0.0.1>
Message-ID: <kyo49n.gr4@spenarnc.xs4all.nl>

In article <Xns9D28186AF890Cfdnbgui7uhu5h8hrnuio at 127.0.0.1>,
Giorgos Tzampanakis  <gt67 at hw.ac.uk> wrote:
>I'm implementing a CPU that will run on an FPGA. I want to have a
>(dead) simple assembler that will generate the machine code for
>me. I want to use Python for that. Are there any libraries that
>can help me with the parsing of the assembly code?

I have a pentium assembler in perl on my website below.
(postit-fixup principle).
You could borrow some idea's, if you can read perl.
The main purpose is to have a very simple and straightforward
assembler at the expense of ease of use.

Groetjes Albert
--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- being exponential -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From michaelveloz at gmail.com  Tue Mar  2 14:02:08 2010
From: michaelveloz at gmail.com (Veloz)
Date: Tue, 2 Mar 2010 11:02:08 -0800 (PST)
Subject: Queue peek?
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>
	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>
Message-ID: <58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>

On Mar 2, 1:18?pm, Raymond Hettinger <pyt... at rcn.com> wrote:
> On Mar 2, 8:29?am, Veloz <michaelve... at gmail.com> wrote:
>
> > Hi all
> > I'm looking for a queue that I can use with multiprocessing, which has
> > a peek method.
>
> > I've seen some discussion about queue.peek but don't see anything in
> > the docs about it.
>
> > Does python have a queue class with peek semantics?
>
> Am curious about your use case? ?Why peek at something
> that could be gone by the time you want to use it.
>
> ? val = q.peek()
> ? if something_i_want(val):
> ? ? ? ?v2 = q.get() ? ? ? ? # this could be different than val
>
> Wouldn't it be better to just get() the value and return if you don't
> need it?
>
> ? val = q.peek()
> ? if not something_i_want(val):
> ? ? ? q.put(val)
>
> Raymond

Yeah, I hear you. Perhaps queue is not the best solution. My highest
level use case is this:  The user visits a web page (my app is a
Pylons app) and requests a "report" be created. The report takes too
long to create and display on the spot, so the user expects to visit
some url "later" and see if the specific report has completed, and if
so, have it returned to them.

At a lower level, I'm thinking of using some process workers to create
these reports in the background; there'd be a request queue (into
which requests for reports would go, each with an ID) and a completion
queue, into which the workers would write an entry when a report was
created, along with an ID matching the original request.

The "peek" parts comes in when the user comes back later to see if
their report has done. That is, in my page controller logic, I'd like
to look through the complete queue and see if the specific report has
been finished (I could tell by matching up the ID of the original
request to the ID in the completed queue). If there was an item in the
queue matching the ID, it would be removed.

It's since occurred to me that perhaps a queue is not the best way to
handle the completions. (We're ignoring the file system as a solution
for the time being, and focusing on in-memory structures). I'm
wondering now if a simple array of completed items wouldn't be better.
Of course, all the access to the array would have to be thread/process-
proof.  As you pointed out, for example, multi-part operations such as
"is such-and-such an ID in the list? If so, remove it and return in"
would have to be treated atomically to avoid concurrency issues.

Any thoughts on this design approach are welcomed :-)
Michael



From philip at semanchuk.com  Tue Mar  2 14:28:57 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 2 Mar 2010 14:28:57 -0500
Subject: freebsd and multiprocessing
In-Reply-To: <4079148c-3690-4c24-b3db-79f685bf8eab@q15g2000yqj.googlegroups.com>
References: <7cabdddf-d936-48c7-9b76-97c37def5f8f@z35g2000yqd.googlegroups.com>
	<mailman.121.1267548737.23598.python-list@python.org>
	<5c8d7d72-710a-41c1-897e-8d5605c61373@e7g2000yqf.googlegroups.com>
	<4079148c-3690-4c24-b3db-79f685bf8eab@q15g2000yqj.googlegroups.com>
Message-ID: <83E70F2A-6024-4790-AA29-60908CB0CFC4@semanchuk.com>


On Mar 2, 2010, at 1:31 PM, Tim Arnold wrote:

> On Mar 2, 12:59 pm, Tim Arnold <a_j... at bellsouth.net> wrote:
>> On Mar 2, 11:52 am, Philip Semanchuk <phi... at semanchuk.com> wrote:
>>> On Mar 2, 2010, at 11:31 AM, Tim Arnold wrote:
>>
>>>> Hi,
>>>> I'm intending to use multiprocessing on a freebsd machine (6.3
>>>> release, quad core, 8cpus, amd64). I see in the doc that on this
>>>> platform I can't use synchronize:
>>
>>>> ImportError: This platform lacks a functioning sem_open
>>>> implementation, therefore, the required synchronization primitives
>>>> needed will not function, see issue 3770.
>>
>>>> As far as I can tell, I have no need to synchronize the  
>>>> processes--I
>>>> have several processes run separately and I need to know when  
>>>> they're
>>>> all finished; there's no communication between them and each owns  
>>>> its
>>>> own log file for output.
>>
>>>> Is anyone using multiprocessing on FreeBSD and run into any other
>>>> gotchas?
>>
>>> Hi Tim,
>>> I don't use multiprocessing but I've written two low-level IPC
>>> packages, one for SysV IPC and the other for POSIX IPC.
>>
>>> I think that multiprocessing prefers POSIX IPC (which is where
>>> sem_open() comes from). I don't know what it uses if that's not
>>> available, but SysV IPC seems a likely alternative. I must  
>>> emphasize,
>>> however, that that's a guess on my part.
>>
>>> FreeBSD didn't have POSIX IPC support until 7.0, and that was sort  
>>> of
>>> broken until 7.2. As it happens, I was testing my POSIX IPC code
>>> against 7.2 last night and it works just fine.
>>
>>> SysV IPC works under FreeBSD 6 (and perhaps earlier versions; 6 is  
>>> the
>>> oldest I've tested). ISTR that by default each message queue is
>>> limited to 2048 bytes in total size. 'sysctl kern.ipc' can probably
>>> tell you that and may even let you change it. Other than that I  
>>> can't
>>> think of any SysV limitations that might bite you.
>>
>>> HTH
>>> Philip
>>
>> Hi Philip,
>> Thanks for that information. I wish I could upgrade the machine to
>> 7.2! alas, out of my power.  I get the following results from sysctl:
>> % sysctl kern.ipc | grep msg
>> kern.ipc.msgseg: 2048
>> kern.ipc.msgssz: 8
>> kern.ipc.msgtql: 40
>> kern.ipc.msgmnb: 2048
>> kern.ipc.msgmni: 40
>> kern.ipc.msgmax: 16384
>>
>> I'll write some test programs using multiprocessing and see how they
>> go before committing to rewrite my current code. I've also been
>> looking at 'parallel python' although it may have the same issues.http://www.parallelpython.com/
>>
>> thanks again,
>> --Tim
>
> Well that didn't work out well. I can't import either Queue or Pool
> from multiprocessing, so I'm back to the drawing board. I'll see now
> how parallel python does on freebsd.


Sorry to hear that didn't work for you. Should you need to get down to  
the nuts & bolts level, my module for SysV IPC is here:
http://semanchuk.com/philip/sysv_ipc/


Good luck with Parallel Python,
Philip



From pmaupin at gmail.com  Tue Mar  2 14:30:32 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Tue, 2 Mar 2010 11:30:32 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
	<hmi5ns$57b$1@dough.gmane.org> <hmjena$n1p$1@dough.gmane.org> 
	<mailman.128.1267552773.23598.python-list@python.org>
Message-ID: <d166cf7a-4ce5-4857-9d24-e095f73c2e6b@p3g2000pra.googlegroups.com>

On Mar 2, 11:59?am, Terry Reedy <tjre... at udel.edu> wrote:

> To me, comparing object notation with programming language is not
> helpful to the OP's purpose.

Yes, I agree, it was a distraction.  I fell into the trap of
responding to the ludicrous claim that "if X is a superset of Y, then
X cannot possibly look better than Y" (a claim made by multiple people
all thinking it was clever) by showing that Y has other supersets that
do in fact look better than Y.  In doing this, I made the mistake of
choosing a superset of an analogue to Y, rather than to Y itself.
When called out on it, I showed that, in fact, the actual X that IS a
superset of Y can be used in a way that looks better.  However, you
are right that JSON is such a small subset of JS that it's really
pretty ridiculous to even compare them, but that still makes the point
that the original argument I was trying to refute is completely
specious.  In retrospect, though, I should have chosen a better way to
make that point, because I let myself get caught up in making and then
defending a flippant statement that I don't really care about one way
or the other.

> His main claim is that JSON can be usefully
> extended but that YAML is too much, so that perhaps he, with help, can
> find a 'sweet spot' in between.

An excellent summary of my position.

Thanks,
Pat


From python at mrabarnett.plus.com  Tue Mar  2 14:44:53 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 02 Mar 2010 19:44:53 +0000
Subject: Queue peek?
In-Reply-To: <58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>
	<58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>
Message-ID: <4B8D6AB5.8010408@mrabarnett.plus.com>

Veloz wrote:
> On Mar 2, 1:18 pm, Raymond Hettinger <pyt... at rcn.com> wrote:
>> On Mar 2, 8:29 am, Veloz <michaelve... at gmail.com> wrote:
>>
>>> Hi all
>>> I'm looking for a queue that I can use with multiprocessing, which has
>>> a peek method.
>>> I've seen some discussion about queue.peek but don't see anything in
>>> the docs about it.
>>> Does python have a queue class with peek semantics?
>> Am curious about your use case?  Why peek at something
>> that could be gone by the time you want to use it.
>>
>>   val = q.peek()
>>   if something_i_want(val):
>>        v2 = q.get()         # this could be different than val
>>
>> Wouldn't it be better to just get() the value and return if you don't
>> need it?
>>
>>   val = q.peek()
>>   if not something_i_want(val):
>>       q.put(val)
>>
>> Raymond
> 
> Yeah, I hear you. Perhaps queue is not the best solution. My highest
> level use case is this:  The user visits a web page (my app is a
> Pylons app) and requests a "report" be created. The report takes too
> long to create and display on the spot, so the user expects to visit
> some url "later" and see if the specific report has completed, and if
> so, have it returned to them.
> 
> At a lower level, I'm thinking of using some process workers to create
> these reports in the background; there'd be a request queue (into
> which requests for reports would go, each with an ID) and a completion
> queue, into which the workers would write an entry when a report was
> created, along with an ID matching the original request.
> 
> The "peek" parts comes in when the user comes back later to see if
> their report has done. That is, in my page controller logic, I'd like
> to look through the complete queue and see if the specific report has
> been finished (I could tell by matching up the ID of the original
> request to the ID in the completed queue). If there was an item in the
> queue matching the ID, it would be removed.
> 
> It's since occurred to me that perhaps a queue is not the best way to
> handle the completions. (We're ignoring the file system as a solution
> for the time being, and focusing on in-memory structures). I'm
> wondering now if a simple array of completed items wouldn't be better.
> Of course, all the access to the array would have to be thread/process-
> proof.  As you pointed out, for example, multi-part operations such as
> "is such-and-such an ID in the list? If so, remove it and return in"
> would have to be treated atomically to avoid concurrency issues.
> 
> Any thoughts on this design approach are welcomed :-)
> 
A set of completed reports, or a dict with the ID as the key? The
advantage of a dict is that the value could contain several bits of
information, such as when it was completed, the status (OK or failed),
etc. You might want to wrap it in a class with locks (mutexes) to ensure
it's threadsafe.


From martin.hellwig at dcuktec.org  Tue Mar  2 14:58:22 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Tue, 02 Mar 2010 19:58:22 +0000
Subject: Queue peek?
In-Reply-To: <mailman.138.1267559095.23598.python-list@python.org>
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>	<58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>
	<mailman.138.1267559095.23598.python-list@python.org>
Message-ID: <hmjqkr$r46$1@news.eternal-september.org>

On 03/02/10 19:44, MRAB wrote:
<cut>
> information, such as when it was completed, the status (OK or failed),
> etc. You might want to wrap it in a class with locks (mutexes) to ensure
> it's threadsafe.
What actually happens if multiple threads at the same time, write to a 
shared dictionary (Not using the same key)?

I would think that if the hashing part of the dictionary has some sort 
of serialization (please forgive me if I misuse a term) it should 'just 
work'(tm)?

-- 
mph



From marduk at python.net  Tue Mar  2 15:22:27 2010
From: marduk at python.net (Albert Hopkins)
Date: Tue, 02 Mar 2010 15:22:27 -0500
Subject: os.fdopen() issue in Python 3.1?
In-Reply-To: <hmjl6a$230$1@dough.gmane.org>
References: <1267539898.477222.7.camel@necropolis>
	<hmjl6a$230$1@dough.gmane.org>
Message-ID: <1267561347.4507.5.camel@necropolis>

On Tue, 2010-03-02 at 13:25 -0500, Terry Reedy wrote:

> To get help, or report a bug, for something like this, be as specific as 
> possible. 'Linux' may be too generic.

This is on Python on Gentoo Linux x64 with kernel 2.6.33.

> 
> > However, with CPython 3.1 I get:
> >
> >              input = os.fdopen(fd).read()
> >          IOError: [Errno 5] Input/output error
> >
> > Is there something wrong in Python 3.1?  Is this the correct way to do
> > this (run a process in a pseudo-tty and read it's output) or is there
> > another way I should/could be doing this?
> 
> No idea, however, the first thing I would do is call the .fdopen and 
> .read methods separately (on separate lines) to isolate which is raising 
> the error.

The exception occurs on the read() method.




From marduk at python.net  Tue Mar  2 15:22:58 2010
From: marduk at python.net (Albert Hopkins)
Date: Tue, 02 Mar 2010 15:22:58 -0500
Subject: os.fdopen() issue in Python 3.1?
In-Reply-To: <4B8D4BB8.8020909@mrabarnett.plus.com>
References: <1267539898.477222.7.camel@necropolis>
	<4B8D4BB8.8020909@mrabarnett.plus.com>
Message-ID: <1267561378.4507.6.camel@necropolis>

On Tue, 2010-03-02 at 17:32 +0000, MRAB wrote:
> The documentation also mentions the 'pty' module. Have you tried that
> instead? 

I haven't but I'll give it a try.  Thanks.

-a




From daniel at stutzbachenterprises.com  Tue Mar  2 15:33:33 2010
From: daniel at stutzbachenterprises.com (Daniel Stutzbach)
Date: Tue, 2 Mar 2010 14:33:33 -0600
Subject: Queue peek?
In-Reply-To: <hmjqkr$r46$1@news.eternal-september.org>
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>
	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>
	<58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>
	<mailman.138.1267559095.23598.python-list@python.org>
	<hmjqkr$r46$1@news.eternal-september.org>
Message-ID: <eae285401003021233i7a62771h590a557341f10ca4@mail.gmail.com>

On Tue, Mar 2, 2010 at 1:58 PM, Martin P. Hellwig <
martin.hellwig at dcuktec.org> wrote:

> What actually happens if multiple threads at the same time, write to a
> shared dictionary (Not using the same key)?
>

All of Python's built-in types are thread safe.  Both updates will happen.
--
Daniel Stutzbach, Ph.D.
President, Stutzbach Enterprises, LLC <http://stutzbachenterprises.com>
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From mrkafk at gmail.com  Tue Mar  2 15:41:44 2010
From: mrkafk at gmail.com (mk)
Date: Tue, 02 Mar 2010 21:41:44 +0100
Subject: conditional import into global namespace
In-Reply-To: <16651e81003021031h3831d4b3i844f331f3d301042@mail.gmail.com>
References: <hmjita$ms4$1@dough.gmane.org>
	<16651e81003021031h3831d4b3i844f331f3d301042@mail.gmail.com>
Message-ID: <hmjt64$63s$1@dough.gmane.org>

Jerry Hill wrote:
> Just import subprocess at the top of your module.  If subprocess
> hasn't been imported yet, it will be imported when your module is
> loaded.  If it's already been imported, your module will use the
> cached version that's already been imported.
> 
> In other words, it sounds like Python already does what you want.  You
> don't need to do anything special.

Oh, thanks!

Hmm it's different than dealing with packages I guess -- IIRC, in 
packages only code in package's __init__.py was executed?

Regards,
mk




From popuser at christest2.dc.k12us.com  Tue Mar  2 15:57:36 2010
From: popuser at christest2.dc.k12us.com (Pop User)
Date: Tue, 02 Mar 2010 15:57:36 -0500
Subject: freebsd and multiprocessing
In-Reply-To: <5c8d7d72-710a-41c1-897e-8d5605c61373@e7g2000yqf.googlegroups.com>
References: <7cabdddf-d936-48c7-9b76-97c37def5f8f@z35g2000yqd.googlegroups.com>	<mailman.121.1267548737.23598.python-list@python.org>
	<5c8d7d72-710a-41c1-897e-8d5605c61373@e7g2000yqf.googlegroups.com>
Message-ID: <4B8D7BC0.6010109@christest2.dc.k12us.com>

On 3/2/2010 12:59 PM, Tim Arnold wrote:
> 
> I'll write some test programs using multiprocessing and see how they
> go before committing to rewrite my current code. I've also been
> looking at 'parallel python' although it may have the same issues.
> http://www.parallelpython.com/
> 

parallelpython works for me on FreeBSD 6.2.



From matt at sidefx.com  Tue Mar  2 15:59:15 2010
From: matt at sidefx.com (Matt Chaput)
Date: Tue, 02 Mar 2010 15:59:15 -0500
Subject: Multiprocessing problem
Message-ID: <4B8D7C23.7050905@sidefx.com>

Hi,

I'm having a problem with the multiprocessing package.

I'm trying to use a simple pattern where a supervisor object starts a 
bunch of worker processes, instantiating them with two queues (a job 
queue for tasks to complete and an results queue for the results). The 
supervisor puts all the jobs in the "job" queue, then join()s the 
workers, and then pulls all the completed results off the "results" queue.

(I don't think I can just use something like Pool.imap_unordered for 
this because the workers need to be objects with state.)

Here's a simplified example:

http://pastie.org/850512

The problem is that seemingly randomly, but almost always, the worker 
processes will deadlock at some point and stop working before they 
complete. This will leave the whole program stalled forever. This seems 
more likely the more work each worker does (to the point where adding 
the time.sleep(0.01) as seen in the example code above guarantees it). 
The problem seems to occur on both Windows and Mac OS X.

I've tried many random variations of the code (e.g. using JoinableQueue, 
calling cancel_join_thread() on one or both queues even though I have no 
idea what it does, etc.) but keep having the problem.

Am I just using multiprocessing wrong? Is this a bug? Any advice?

Thanks,

Matt


From rfritz at u.washington.edu  Tue Mar  2 16:14:50 2010
From: rfritz at u.washington.edu (R Fritz)
Date: Tue, 2 Mar 2010 13:14:50 -0800
Subject: cpan for python?
References: <mailman.20.1267367545.23598.python-list@python.org>
Message-ID: <hmjv4b$mqk$1@reader1.panix.com>

On 2010-02-28 06:31:56 -0800, ssteinerX at gmail.com said:

> 
> On Feb 28, 2010, at 9:28 AM, Someone Something wrote:
> 
>> Is there something like cpan for python? I like python's syntax, but 
>> Iuse perl because of cpan and the tremendous modules that it has.  --
> 
> Please search the mailing list archives.
> 
> This subject has been discussed to absolute death.

But somehow the question is not in the FAQ, though the answer is. See:
  
<http://www.python.org/doc/faq/library/#how-do-i-find-a-module-or-application-to-perform-task-x>

-- 


Randolph Fritz
  design machine group, architecture department, university of washington
rfritz at u.washington.edu -or- rfritz333 at gmail.com



From ben+python at benfinney.id.au  Tue Mar  2 16:22:40 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 03 Mar 2010 08:22:40 +1100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
	<mailman.78.1267477780.23598.python-list@python.org>
	<20100302183527.47c6e8f5@geekmail.INVALID>
Message-ID: <878waazae7.fsf@benfinney.id.au>

Andreas Waldenburger <usenot at geekmail.INVALID> writes:

> Don't get me wrong; our whole system is more fragile than I find
> comfortable. But I guess getting 10ish different parties around the
> globe to work in complete unison is quite a feat, and I'm surprised it
> even works as it is. But it does, and I'm glad we don't have to
> micromanage other people's code.

It's rather odd that you think of ?require general quality standards,
independently measurable and testable? to be ?micromanaging?.

I guess that when even the *customers* will resist implementing such
quality expectations, it's little surprise that the vendors continue to
push out such shoddy work on their customers.

-- 
 \     ?Why am I an atheist? I ask you: Why is anybody not an atheist? |
  `\      Everyone starts out being an atheist.? ?Andy Rooney, _Boston |
_o__)                                                Globe_ 1982-05-30 |
Ben Finney


From davea at ieee.org  Tue Mar  2 16:23:34 2010
From: davea at ieee.org (Dave Angel)
Date: Tue, 02 Mar 2010 16:23:34 -0500
Subject: Adding to a module's __dict__?
In-Reply-To: <hmjifd$ju3$1@dough.gmane.org>
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>	<mailman.96.1267508316.23598.python-list@python.org>	<roy-3CB7A4.08210202032010@news.panix.com>	<mailman.107.1267536800.23598.python-list@python.org>	<f4c188f0-7dba-4629-8a16-eed713b5920f@15g2000yqa.googlegroups.com>	<4B8D3A3A.8030501@optimum.net>
	<hmjifd$ju3$1@dough.gmane.org>
Message-ID: <4B8D81D6.4070001@ieee.org>

Terry Reedy wrote:
> On 3/2/2010 11:18 AM, John Posner wrote:
>> On 3/2/2010 10:19 AM, Roy Smith wrote:
>>>
>>> Somewhat sadly, in my case, I can't even machine process the header
>>> file. I don't, strictly speaking, have a header file. What I have is
>>> a PDF which documents what's in the header file, and I'm manually re-
>>> typing the data out of that. Sigh.
>
> There are Python modules to read/write pdf.
>
>> Here's an idea, perhaps too obvious, to minimize your keystrokes:
>>
>> 1. Create a text file with the essential data:
>>
>> XYZ_FOO 0 The foo property
>> XYZ_BAR 1 The bar property
>> XYZ_BAZ 2 reserved for future use
>>
>> 2. Use a Python script to convert this into the desired code:
>>
>> declare('XYZ_FOO', 0, "The foo property")
>> declare('XYZ_BAR', 1, "The bar property")
>> declare('XYZ_BAZ', 2, "reserved for future use")
>>
>> Note:
>>
>>  >>> s
>> 'XYZ_FOO 0 The foo property'
>>  >>> s.split(None, 2)
>> ['XYZ_FOO', '0', 'The foo property']
>
> Given that set of triples is constant, I would think about having the 
> Python script do the computation just once, instead of with every 
> inport. In other words, the script should *call* the declare function 
> and then write out the resulting set of dicts either to a .py or 
> pickle file.
>
> tjr
>
>
There have been lots of good suggestions in this thread.  Let me give 
you my take:

1) you shouldn't want to clutter up the global dictionary of your main 
processing module.  There's too much risk of getting a collision, either 
with the functions you write, or with some builtin.  That's especially 
true if you might later want to use a later version of that pdf file.  
Easiest solution for your purposes, make it a separate module.  Give it 
a name like defines, and in your main module, you use

import defines
print  defines.XYZ_FOO

And if that's too much typing, you can do:
import defines as I
print  I.XYZ_FOO

Next problem is to parse that pdf file.  One solution is to use a pdf 
library.  But another is to copy/paste it into a text file, and parse 
that.   Assuming it'll paste, and that the lines you want are 
recognizable (eg. they all begin as  #define), the parsing should be 
pretty easy.  The results of the parsing is a file  defines.py

Now, if the pdf ever changes, rerun your parsing program.  But don't run 
it every time your application runs.

If the pdf file were changing often, then I'd have a different answer:
2) define an empty class, just as a placeholder, and make one instance I
      Populate a class instance I with    setattrib() calls, but access 
it with direct syntax, same as our first example.


DaveA



From ben+python at benfinney.id.au  Tue Mar  2 16:25:13 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 03 Mar 2010 08:25:13 +1100
Subject: Broken references in postings
References: <hmjiuc$7pk$1@reader1.panix.com>
Message-ID: <874okyza9y.fsf@benfinney.id.au>

Grant Edwards <invalid at invalid.invalid> writes:

> Or is it just individual news/mail clients that are broken?

This, I believe. Many clients mess up the References and In-Reply-To
fields, in the face of many years of complaint to the vendors.

Most free-software clients get it right, AFAICT.

-- 
 \      ?Contentment is a pearl of great price, and whosoever procures |
  `\        it at the expense of ten thousand desires makes a wise and |
_o__)                                      happy purchase.? ?J. Balguy |
Ben Finney


From dont.spam.holgerm1969 at gmx.de  Tue Mar  2 16:26:59 2010
From: dont.spam.holgerm1969 at gmx.de (Holger Mueller)
Date: Tue, 2 Mar 2010 22:26:59 +0100
Subject: Writing an assembler in Python
References: <Xns9D28186AF890Cfdnbgui7uhu5h8hrnuio@127.0.0.1>
Message-ID: <hmjvr3$r45$03$2@news.t-online.com>

Giorgos Tzampanakis <gt67 at hw.ac.uk> wrote:
> I'm implementing a CPU that will run on an FPGA. I want to have a  
> (dead) simple assembler that will generate the machine code for 
> me. I want to use Python for that. Are there any libraries that 
> can help me with the parsing of the assembly code?

Why coding assembler if you can type in hexdumps...

scnr
    Holger
-- 
http://www.kati-und-holger.de/holgersblog.php


From MLMDev at Comcast.net  Tue Mar  2 16:48:08 2010
From: MLMDev at Comcast.net (Mitchell L Model)
Date: Tue, 2 Mar 2010 16:48:08 -0500
Subject: CGI, POST, and file uploads
Message-ID: <5F601006-5DCE-4353-BD04-DFABDFA8C5D2@Comcast.net>

Can someone tell me how to upload the contents of a (relatively small)  
file using an HTML form and CGI in Python 3.1? As far as I can tell  
from a half-day of experimenting, browsing, and searching the Python  
issue tracker, this is broken.  Very simple example:

<html>
   <head>
   </head>
   <body>
     <form action="http://localhost:9000/cgi/cgi-test.py"
	  enctype="multipart/form-data"
	  method="post">
	<label>File</label><br/>
	  <input type="file" name="contents"> <br/>
	<button type="submit" >Submit</button> <br/>
     </form>
   </body>
</html>


cgi-test.py:


#!/usr/local/bin/python3
import cgi
import sys
form = cgi.FieldStorage()
print(form.getfirst('contents'), file=sys.stderr)
print('done')


I run a CGI server with:

#!/usr/bin/env python3
from http.server import HTTPServer, CGIHTTPRequestHandler
HTTPServer(('', 9000), CGIHTTPRequestHandler).serve_forever()



What happens is that the upload never stops. It works in 2.6.

If I cancel the upload from the browser, I get the following output,  
so I know that basically things are working;
the cgi script just never finishes reading the POST input:

localhost - - [02/Mar/2010 16:37:36] "POST /cgi/cgi-test.py HTTP/1.1"  
200 -
<<<CONTENTS OF MY FILE PRINTED HERE>>>
----------------------------------------
Exception happened during processing of request from ('127.0.0.1',  
55779)
Traceback (most recent call last):
   File "/Library/Frameworks/Python.framework/Versions/3.1/lib/ 
python3.1/socketserver.py", line 281, in _handle_request_noblock
     self.process_request(request, client_address)
   File "/Library/Frameworks/Python.framework/Versions/3.1/lib/ 
python3.1/socketserver.py", line 307, in process_request
     self.finish_request(request, client_address)
   File "/Library/Frameworks/Python.framework/Versions/3.1/lib/ 
python3.1/socketserver.py", line 320, in finish_request
     self.RequestHandlerClass(request, client_address, self)
   File "/Library/Frameworks/Python.framework/Versions/3.1/lib/ 
python3.1/socketserver.py", line 614, in __init__
     self.handle()
   File "/Library/Frameworks/Python.framework/Versions/3.1/lib/ 
python3.1/http/server.py", line 352, in handle
     self.handle_one_request()
   File "/Library/Frameworks/Python.framework/Versions/3.1/lib/ 
python3.1/http/server.py", line 346, in handle_one_request
     method()
   File "/Library/Frameworks/Python.framework/Versions/3.1/lib/ 
python3.1/http/server.py", line 868, in do_POST
     self.run_cgi()
   File "/Library/Frameworks/Python.framework/Versions/3.1/lib/ 
python3.1/http/server.py", line 1045, in run_cgi
     if not self.rfile.read(1):
   File "/Library/Frameworks/Python.framework/Versions/3.1/lib/ 
python3.1/socket.py", line 214, in readinto
     return self._sock.recv_into(b)
socket.error: [Errno 54] Connection reset by peer
----------------------------------------




From usenot at geekmail.INVALID  Tue Mar  2 16:51:56 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Tue, 2 Mar 2010 22:51:56 +0100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
	<87eik3zmi8.fsf@benfinney.id.au>
	<20100302184056.743a71e7@geekmail.INVALID>
	<mailman.129.1267553139.23598.python-list@python.org>
Message-ID: <20100302225156.67171851@geekmail.INVALID>

On Tue, 02 Mar 2010 19:05:25 +0100 Jean-Michel Pichavant
<jeanmichel at sequans.com> wrote:

> Andreas Waldenburger wrote:
> > 
> > I had hoped that everyone just read it, went like "Oh geez.",
> > smiled it off with a hint of lesson learned and got back to
> > whatever it was they were doing. Alas, I was wrong ... and I'm
> > sorry.
> >
> There's something wrong saying that stupid people write working code 
> that totally satisfies your needs. Don't you agree ? ;-)
> 
No, in fact I don't.

It works. They are supposed to make it work. And that's what they do.
Whether or not they put their docstrings in the place they should does
not change that their code works.

Sorry, you guys drained all the funny out of me.

/W

-- 
INVALID? DE!



From mrkafk at gmail.com  Tue Mar  2 16:54:39 2010
From: mrkafk at gmail.com (mk)
Date: Tue, 02 Mar 2010 22:54:39 +0100
Subject: Queue peek?
In-Reply-To: <eae285401003021233i7a62771h590a557341f10ca4@mail.gmail.com>
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>	<58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>	<mailman.138.1267559095.23598.python-list@python.org>	<hmjqkr$r46$1@news.eternal-september.org>
	<eae285401003021233i7a62771h590a557341f10ca4@mail.gmail.com>
Message-ID: <hmk1er$mlb$1@dough.gmane.org>

Daniel Stutzbach wrote:
> On Tue, Mar 2, 2010 at 1:58 PM, Martin P. Hellwig 
> <martin.hellwig at dcuktec.org <mailto:martin.hellwig at dcuktec.org>> wrote:
> 
>     What actually happens if multiple threads at the same time, write to
>     a shared dictionary (Not using the same key)?

> All of Python's built-in types are thread safe.  Both updates will happen.

No need to use synchro primitives like locks?

I know that it may work, but that strikes me as somehow wrong... I'm 
used to using things like Lock().acquire() and Lock().release() when 
accessing shared data structures, whatever they are.

Although trying to do the "right thing" may indeed get one in trouble in 
case of deadlock caused by a bug in one's own program.

Regards,
mk




From eike.welk at gmx.net  Tue Mar  2 17:00:29 2010
From: eike.welk at gmx.net (Eike Welk)
Date: Tue, 02 Mar 2010 23:00:29 +0100
Subject: Method / Functions - What are the differences?
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
	<mailman.109.1267539415.23598.python-list@python.org>
Message-ID: <hmk1mn$70u$1@newsreader3.netcologne.de>

John Posner wrote:
> I've updated the text at this location:
> 
>  >   http://cl1p.net/bruno_0301.rst/

I think this is a very useful writeup! 

It would be perfect with a little bit of introduction that says:
1. - What it is: "The rough details of method look-up";
2. - which contains some of the questions that that made that authors write 
the text. This way people with similar questions can find it with Google.

Additionally the link to the relevant section in the Python documentation 
would be great. I can't find it!

A link to an article about the details of class creation and metaclasses 
would be good too.


Thanks for writing this great little text,
Eike.



From jkrukoff at ltgc.com  Tue Mar  2 17:08:43 2010
From: jkrukoff at ltgc.com (John Krukoff)
Date: Tue, 02 Mar 2010 15:08:43 -0700
Subject: Queue peek?
In-Reply-To: <hmk1er$mlb$1@dough.gmane.org>
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>
	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>
	<58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>
	<mailman.138.1267559095.23598.python-list@python.org>
	<hmjqkr$r46$1@news.eternal-september.org>
	<eae285401003021233i7a62771h590a557341f10ca4@mail.gmail.com>
	<hmk1er$mlb$1@dough.gmane.org>
Message-ID: <1267567723.4101.28.camel@localhost.localdomain>

On Tue, 2010-03-02 at 22:54 +0100, mk wrote:
<snip>
> No need to use synchro primitives like locks?
> 
> I know that it may work, but that strikes me as somehow wrong... I'm 
> used to using things like Lock().acquire() and Lock().release() when 
> accessing shared data structures, whatever they are.
<snip>

This is one of those places where the GIL is a good thing, and makes
your life simpler. You could consider it that the interpreter does the
locking for you for such primitive operations, if you like.
-- 
John Krukoff <jkrukoff at ltgc.com>
Land Title Guarantee Company



From usenot at geekmail.INVALID  Tue Mar  2 17:19:09 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Tue, 2 Mar 2010 23:19:09 +0100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
	<mailman.78.1267477780.23598.python-list@python.org>
	<20100302183527.47c6e8f5@geekmail.INVALID>
	<878waazae7.fsf@benfinney.id.au>
Message-ID: <20100302231909.6a5bad2d@geekmail.INVALID>

On Wed, 03 Mar 2010 08:22:40 +1100 Ben Finney
<ben+python at benfinney.id.au> wrote:

> Andreas Waldenburger <usenot at geekmail.INVALID> writes:
> 
> > Don't get me wrong; our whole system is more fragile than I find
> > comfortable. But I guess getting 10ish different parties around the
> > globe to work in complete unison is quite a feat, and I'm surprised
> > it even works as it is. But it does, and I'm glad we don't have to
> > micromanage other people's code.
> 
> It's rather odd that you think of ?require general quality standards,
> independently measurable and testable? to be ?micromanaging?.
> 
I should know better than to argue these things, but I don't. Hmph.

We demand testable quality standards, but not of their code. We demand
it of their software. We say *what* we want, they decide *how* they'll
do it. Noncompliance will be fined, by a contractually agreed
amount. Everything beyond that is micromanaging and detracts workforce
from the stuff *we* have to do.

We are in exactly the same kind of bond with a company that buys our
system (and support). I have yet to see any one of them demand to see
how we write our code. Why should they care? (Rhetorical question, I
refuse to discuss this any further.)


> I guess that when even the *customers* will resist implementing such
> quality expectations, it's little surprise that the vendors continue
> to push out such shoddy work on their customers.
> 
When I'm building bicycles I can go to the trouble of going by what
method of galvanization my tires are produced. Or I save myself the
trouble and just take the best offer and hold them responsible when
they don't deliver on their promise. Both possible, both work, and both
appropriate in certain situations.

You can keep discussing if you want, I've said more than I was hoping
to.

/W


-- 
INVALID? DE!



From albert at spenarnc.xs4all.nl  Tue Mar  2 17:38:11 2010
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 02 Mar 2010 22:38:11 GMT
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org>
Message-ID: <kyoevn.k63@spenarnc.xs4all.nl>

In article <hm9cbc$9p4$1 at speranza.aioe.org>, Mel  <mwilson at the-wire.com> wrote:
>Jean-Michel Pichavant wrote:
>> Andreas Waldenburger wrote:
>>> On Fri, 26 Feb 2010 09:09:36 -0600 Tim Daneliuk <tundra at tundraware.com>
>>> wrote:
>>>> Reminiscent of:
>>>> mov  AX,BX               ; Move the contents of BX into AX
>
>>> Well, there might be some confusion there as to what gets moved where,
>>> wouldn't you say? I guess this goes away after a couple of months,
>>> though.
>
>> I agree to that statement, I was surprised that mov AX,BX assumes that
>> BX is the source, and AX the destination. I never programmed in
>> assembler though.
>
>You could think of it as a not bad use of the design principle "Clear The
>Simple Stuff Out Of The Way First".  Destinations are commonly a lot simpler
>than sources -- just as in Python assignment statements.  So you can tell
>more or less at a glance what's going to be changed, then get into the deep
>analysis to find what it's going to be changed to.

The real background is that a very long time ago at Intel
the first guy that wrote an assembler, got it "wrong", i.e.
violated the conventions established already at the time.

No nothing clever, nothing conscious, just reinventing the wheel
badly.

Next time you tell me that the MSDOS "file" system was well thought
out :-)

>       Mel.

Groetjes Albert

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- being exponential -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From verace at bohlsenrestaurants.com  Tue Mar  2 17:39:46 2010
From: verace at bohlsenrestaurants.com (Sugar Dining Den and Social Club)
Date: Tue, 02 Mar 2010 14:39:46 -0800
Subject: Verace Hospitality Late Night Dinner
Message-ID: <EC.AE.03209.2B39D8B4@msg-002.msxtra.com>

An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20100302/bbb7a9ee/attachment.html>

From tomf.sessile at gmail.com  Tue Mar  2 17:47:36 2010
From: tomf.sessile at gmail.com (TomF)
Date: Tue, 2 Mar 2010 14:47:36 -0800
Subject: cpan for python?
References: <mailman.20.1267367545.23598.python-list@python.org>
	<hmjv4b$mqk$1@reader1.panix.com>
Message-ID: <2010030214473616807-tomfsessile@gmailcom>

On 2010-03-02 13:14:50 -0800, R Fritz <rfritz at u.washington.edu> said:

> On 2010-02-28 06:31:56 -0800, ssteinerX at gmail.com said:
>> 
>> On Feb 28, 2010, at 9:28 AM, Someone Something wrote:
>> 
>>> Is there something like cpan for python? I like python's syntax, but 
>>> Iuse perl because of cpan and the tremendous modules that it has.  --
>> 
>> Please search the mailing list archives.
>> 
>> This subject has been discussed to absolute death.
> 
> But somehow the question is not in the FAQ, though the answer is. See:
>   
> <http://www.python.org/doc/faq/library/#how-do-i-find-a-module-or-application-to-perform-task-x>

There 
> 
is also a program called cpan, distributed with Perl.  It is used for 
searching, downloading, installing and testing modules from the CPAN 
repository.  It's far more extensive than setuptools.  AFAIK the python 
community has developed nothing like it.

-Tom



From aahz at pythoncraft.com  Tue Mar  2 17:53:32 2010
From: aahz at pythoncraft.com (Aahz)
Date: 2 Mar 2010 14:53:32 -0800
Subject: Broken references in postings
References: <hmjiuc$7pk$1@reader1.panix.com>
Message-ID: <hmk4tc$mol$1@panix5.panix.com>

In article <hmjiuc$7pk$1 at reader1.panix.com>,
Grant Edwards  <invalid at invalid.invalid> wrote:
>
>I've noticed recently that a lot of the "refernces" and
>"in-reply-to" headers in c.l.p are broken, resulting in the
>inability to move from a child to a parent in a tree.

One issue with the mail/news gateway is that (unless it's been fixed)
In-Reply-To: does not get copied to References: (which is what most
newsreaders need to thread properly).
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From aahz at pythoncraft.com  Tue Mar  2 17:59:14 2010
From: aahz at pythoncraft.com (Aahz)
Date: 2 Mar 2010 14:59:14 -0800
Subject: Is this secure?
References: <mailman.110.1266935711.4577.python-list@python.org>
	<mailman.247.1267115557.4577.python-list@python.org>
	<hmd5v7$bir$1@panix5.panix.com>
	<mailman.120.1267548006.23598.python-list@python.org>
Message-ID: <hmk582$sqq$1@panix5.panix.com>

In article <mailman.120.1267548006.23598.python-list at python.org>,
Robert Kern  <robert.kern at gmail.com> wrote:
>On 2010-02-28 01:28 AM, Aahz wrote:
>> In article<mailman.247.1267115557.4577.python-list at python.org>,
>> Robert Kern<robert.kern at gmail.com>  wrote:
>>>
>>> If you are storing the password instead of making your user remember
>>> it, most platforms have some kind of keychain secure password
>>> storage. I recommend reading up on the APIs available on your targeted
>>> platforms.
>>
>> Are you sure?  I haven't done a lot of research, but my impression was
>> that Windows didn't have anything built in.
>
>You're right, not built-in, but Windows does provide enough crypto
>services for a cross-platform Python implementation to be built:
>
>   http://pypi.python.org/pypi/keyring

Thanks you!  That's a big help!
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From aahz at pythoncraft.com  Tue Mar  2 18:01:31 2010
From: aahz at pythoncraft.com (Aahz)
Date: 2 Mar 2010 15:01:31 -0800
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<87eik3zmi8.fsf@benfinney.id.au>
	<20100302184056.743a71e7@geekmail.INVALID>
	<20100302225156.67171851@geekmail.INVALID>
Message-ID: <hmk5cb$9j1$1@panix5.panix.com>

In article <20100302225156.67171851 at geekmail.INVALID>,
Andreas Waldenburger  <usenot at geekmail.INVALID> wrote:
>
>Sorry, you guys drained all the funny out of me.

Don't let a few nitpickers do that!  I thought it was funny; after that,
just remember that every Usenet thread drifts away from *your* point.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From matt at whoosh.ca  Tue Mar  2 18:04:09 2010
From: matt at whoosh.ca (Matt Chaput)
Date: Tue, 02 Mar 2010 18:04:09 -0500
Subject: Multiprocessing problem
In-Reply-To: <4B8D7C23.7050905@sidefx.com>
References: <4B8D7C23.7050905@sidefx.com>
Message-ID: <4B8D9969.60801@whoosh.ca>

On 3/2/2010 3:59 PM, Matt Chaput wrote:
 > I'm trying to use a simple pattern where a supervisor object starts a
 > bunch of worker processes, instantiating them with two queues (a job
 > queue for tasks to complete and an results queue for the results). The
 > supervisor puts all the jobs in the "job" queue, then join()s the
 > workers, and then pulls all the completed results off the "results" 
queue.

 > Here's a simplified example:
 >
 > http://pastie.org/850512

I should mention that if I change my code so the workers just pull 
things off the job queue but don't put any results on the result queue 
until after they see the None sentinel in the job queue and break out of 
the loop, I don't get the deadlock. So it's something about getting from 
one queue and putting to another queue in close proximity.

Hopefully I'm making a simple mistake with how I'm using the library and 
it'll be easy to fix...

Thanks,

Matt


From invalid at invalid.invalid  Tue Mar  2 18:12:17 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Tue, 2 Mar 2010 23:12:17 +0000 (UTC)
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <kyoevn.k63@spenarnc.xs4all.nl>
Message-ID: <hmk60h$nce$1@reader1.panix.com>

On 2010-03-02, Albert van der Horst <albert at spenarnc.xs4all.nl> wrote:

> No nothing clever, nothing conscious, just reinventing the wheel
> badly.
>
> Next time you tell me that the MSDOS "file" system was well thought
> out :-)

Just a mediocre copy of the CP/M filesystem, which was in turn
copied from DEC's RSTS or RSX.

-- 
Grant Edwards               grant.b.edwards        Yow! Kids, don't gross me
                                  at               off ... "Adventures with
                              gmail.com            MENTAL HYGIENE" can be
                                                   carried too FAR!


From steve at holdenweb.com  Tue Mar  2 18:24:51 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 02 Mar 2010 18:24:51 -0500
Subject: Email Script
In-Reply-To: <4dc0cfea1003020753g404e6fbcr29ed52e21e2bb18c@mail.gmail.com>
References: <4dc0cfea1003020748g786aded2i9c5287972aa8984c@mail.gmail.com>
	<4dc0cfea1003020753g404e6fbcr29ed52e21e2bb18c@mail.gmail.com>
Message-ID: <hmk6o3$8gf$1@dough.gmane.org>

Victor Subervi wrote:
> On Tue, Mar 2, 2010 at 11:48 AM, Victor Subervi <victorsubervi at gmail.com
[...]
>     This sends only the first of the two emails. Why doesn't it work to
>     send the second? What do?
>     TIA,
>     beno
> 
> 
> Should I put a timer between instances of Email? 
> 
> 
Np.

http://en.wikipedia.org/wiki/Cargo_cult_programming

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at REMOVE-THIS-cybersource.com.au  Tue Mar  2 18:32:52 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 02 Mar 2010 23:32:52 GMT
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
	<87eik3zmi8.fsf@benfinney.id.au>
	<20100302184056.743a71e7@geekmail.INVALID>
	<mailman.129.1267553139.23598.python-list@python.org>
	<20100302225156.67171851@geekmail.INVALID>
Message-ID: <4b8da024$0$8783$c3e8da3@news.astraweb.com>

On Tue, 02 Mar 2010 22:51:56 +0100, Andreas Waldenburger wrote:

> On Tue, 02 Mar 2010 19:05:25 +0100 Jean-Michel Pichavant
> <jeanmichel at sequans.com> wrote:
> 
>> Andreas Waldenburger wrote:
>> > 
>> > I had hoped that everyone just read it, went like "Oh geez.", smiled
>> > it off with a hint of lesson learned and got back to whatever it was
>> > they were doing. Alas, I was wrong ... and I'm sorry.
>> >
>> There's something wrong saying that stupid people write working code
>> that totally satisfies your needs. Don't you agree ? ;-)
>> 
> No, in fact I don't.
> 
> It works. They are supposed to make it work. And that's what they do.
> Whether or not they put their docstrings in the place they should does
> not change that their code works.
> 
> Sorry, you guys drained all the funny out of me.

Most of the customers I've worked for have insisted we follow best 
practices. Sometimes they even invent their own best practices that 
nobody has even heard of, and that's fun (not). You're the first one I've 
ever met that bitches publicly that your contractors don't follow best 
practice, but objects strenuously to the idea that you are right to care 
about that they don't.

Wow. Just... wow.

P.S. next time you want some not-quite-best-practice Python code written, 
send me an email off-list. I'll be more than happy to do not-quite-best-
practice work for you. 

*wink*



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Tue Mar  2 18:34:02 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 02 Mar 2010 23:34:02 GMT
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
	<mailman.78.1267477780.23598.python-list@python.org>
	<20100302183527.47c6e8f5@geekmail.INVALID>
	<878waazae7.fsf@benfinney.id.au>
	<20100302231909.6a5bad2d@geekmail.INVALID>
Message-ID: <4b8da06a$0$8783$c3e8da3@news.astraweb.com>

On Tue, 02 Mar 2010 23:19:09 +0100, Andreas Waldenburger wrote:

> We demand testable quality standards, but not of their code. We demand
> it of their software. We say *what* we want, they decide *how* they'll
> do it. Noncompliance will be fined, by a contractually agreed amount.
> Everything beyond that is micromanaging and detracts workforce from the
> stuff *we* have to do.

You specify the Functional Requirements but not the Design Requirements. 
Fair enough.

 
> We are in exactly the same kind of bond with a company that buys our
> system (and support). I have yet to see any one of them demand to see
> how we write our code. Why should they care? (Rhetorical question, I
> refuse to discuss this any further.)

It is true that most people don't care how code is written. But they 
*should* care, because how it is written directly impacts the quality of 
the code. Saying "I don't care how it is written" is precisely the same 
as saying "I don't care how reliable, secure or efficient the code is".

Of course people do this. People also inhale carcinogenic chemicals, vote 
bad laws into place, drive too fast, ingest noxious chemicals, and spend 
hours on Usenet debating the number of angels that can dance on the head 
of a pin.


>> I guess that when even the *customers* will resist implementing such
>> quality expectations, it's little surprise that the vendors continue to
>> push out such shoddy work on their customers.
>> 
> When I'm building bicycles I can go to the trouble of going by what
> method of galvanization my tires are produced. Or I save myself the
> trouble and just take the best offer and hold them responsible when they
> don't deliver on their promise. Both possible, both work, and both
> appropriate in certain situations.

Many years ago, I assisted a professional building architect design a 
software system for specifying the requirements of major architectural 
works such as bridges and high-rise buildings. They specify *everything*, 
right down to the type of sand used in the concrete and the grade of 
steel used for the frame. When using the wrong type of sand could mean 
that the bridge collapses in 35 years, you soon learn that, yes, you damn 
well better care.



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Tue Mar  2 18:36:21 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 02 Mar 2010 23:36:21 GMT
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
	<hmi5ns$57b$1@dough.gmane.org> <hmjena$n1p$1@dough.gmane.org>
	<mailman.128.1267552773.23598.python-list@python.org>
	<d166cf7a-4ce5-4857-9d24-e095f73c2e6b@p3g2000pra.googlegroups.com>
Message-ID: <4b8da0f4$0$8783$c3e8da3@news.astraweb.com>

On Tue, 02 Mar 2010 11:30:32 -0800, Patrick Maupin wrote:

> On Mar 2, 11:59?am, Terry Reedy <tjre... at udel.edu> wrote:
> 
>> To me, comparing object notation with programming language is not
>> helpful to the OP's purpose.
> 
> Yes, I agree, it was a distraction.  I fell into the trap of responding
> to the ludicrous claim that "if X is a superset of Y, then X cannot
> possibly look better than Y" (a claim made by multiple people all
> thinking it was clever) by showing that Y has other supersets that do in
> fact look better than Y.

It's not ludicrous.

You claim that:

(1) JSON is too hard to edit;

(2) RSON is a superset of JSON (the PEP even explicitly says "All valid 
UTF-8 encoded JSON files are also valid RSON files");

(3) which implies that all JSON files are valid RSON files.

If you reject the logical conclusion that RSON must therefore also be too 
hard to edit, then perhaps JSON isn't too hard to edit either.

You seem to be taking the position that if you start with a config file 
config.json, it is "too hard to edit", but then by renaming it to 
config.rson it magically becomes easier to edit. That *is* ludicrous.

Perhaps what you mean to say is that JSON *can be* (not is) too hard to 
edit, and RSON *can be* too hard to edit too, but RSON has additional 
benefits, including being easier to edit *sometimes*.

So far you have done (in my opinion) a really poor job of explaining what 
those benefits are. You've bad-mouthed existing config formats, then 
tried to convince us that RSON is almost exactly the same as one of those 
formats apart from a couple of trivial changes of spelling (True for 
true, etc.).

In my opinion, if you're going to get any traction with RSON, you need to 
demonstrate some examples of where JSON actually is hard to write, and 
show how RSON makes it easier. It's not good enough showing badly written 
JSON, it has to be examples that can't be written less badly given the 
constraints of JSON.


-- 
Steven


From ben+python at benfinney.id.au  Tue Mar  2 18:42:04 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 03 Mar 2010 10:42:04 +1100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
	<87eik3zmi8.fsf@benfinney.id.au>
	<20100302184056.743a71e7@geekmail.INVALID>
	<mailman.129.1267553139.23598.python-list@python.org>
	<20100302225156.67171851@geekmail.INVALID>
Message-ID: <877hpuxpdf.fsf@benfinney.id.au>

Andreas Waldenburger <usenot at geekmail.INVALID> writes:

> It works. They are supposed to make it work. And that's what they do.
> Whether or not they put their docstrings in the place they should does
> not change that their code works.

No-one has been denying that.

What the quality of their source code *does* affect, though, is its
maintainability over time ? especially in the inevitable event that the
relationship with you as their customer comes to an end.

The arguments I've seen here in this sub-thread have been in favour of
customers demanding that the code meets functional requirements *and*
soruce code quality requirements.

Just as customers should demand both that a building be built to do its
job well, *and* that its architectural plans meet measurable, testable
industry standards of quality for independent re-use at some
indeterminate later date.

If we don't demand such things as customers of program developers, we
deserve what programs we get.

-- 
 \           ?Special today: no ice cream.? ?mountain inn, Switzerland |
  `\                                                                   |
_o__)                                                                  |
Ben Finney


From marduk at python.net  Tue Mar  2 18:45:49 2010
From: marduk at python.net (Albert Hopkins)
Date: Tue, 02 Mar 2010 18:45:49 -0500
Subject: os.fdopen() issue in Python 3.1?
In-Reply-To: <4B8D4BB8.8020909@mrabarnett.plus.com>
References: <1267539898.477222.7.camel@necropolis>
	<4B8D4BB8.8020909@mrabarnett.plus.com>
Message-ID: <1267573549.495250.0.camel@centar>

On Tue, 2010-03-02 at 17:32 +0000, MRAB wrote:
> The documentation also mentions the 'pty' module. Have you tried that
> instead? 

I tried to use pty.fork() but it also produces the same error.

I also tried passing 'r', and 'rb' to fdopen() but it didn't make any
difference.

-a




From marduk at python.net  Tue Mar  2 18:59:00 2010
From: marduk at python.net (Albert Hopkins)
Date: Tue, 02 Mar 2010 18:59:00 -0500
Subject: os.fdopen() issue in Python 3.1?
In-Reply-To: <1267561347.4507.5.camel@necropolis>
References: <1267539898.477222.7.camel@necropolis>
	<hmjl6a$230$1@dough.gmane.org>  <1267561347.4507.5.camel@necropolis>
Message-ID: <1267574340.495250.4.camel@centar>

This appears to be Issue 5380[1] which is still open.  I've cc'ed myself
to that issue.

[1] http://bugs.python.org/issue5380





From marketing at rbcom.it  Tue Mar  2 19:08:19 2010
From: marketing at rbcom.it (RBCOM MEDIA GROUP)
Date: Wed, 3 Mar 2010 01:08:19 +0100
Subject: UNA VETRINA SUL MONDO
Message-ID: <00e99839$40240$efd90474441088@raffaele-6a745d>

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From news123 at free.fr  Tue Mar  2 19:30:26 2010
From: news123 at free.fr (News123)
Date: Wed, 03 Mar 2010 01:30:26 +0100
Subject: Image.frombuffer and warning
Message-ID: <4b8dada2$0$6285$426a74cc@news.free.fr>

Hi,

I am using the PIL function from_buffer in python 2.6.4

I am having the line
im2 = Image.frombuffer('L',(wx,wy),buf)


I receive the warning:
> ./pytest.py:63: RuntimeWarning: the frombuffer defaults may change in
a future release; for portability, change the call to read:
>   frombuffer(mode, size, data, 'raw', mode, 0, 1)
>   im2 = Image.frombuffer('L',(wx,wy),buf)


Naively I assumed, that changing my code to


im2 = Image.frombuffer('L',(wx,wy),buf,'raw','L',0,1)


should fix the issue:

However I receive exactly the same error as before.

What am I doing wrong?


thanks a lot in advance and bye


N


From no.email at nospam.invalid  Tue Mar  2 19:33:50 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Tue, 02 Mar 2010 16:33:50 -0800
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
	<hmi5ns$57b$1@dough.gmane.org> <hmjena$n1p$1@dough.gmane.org>
	<mailman.128.1267552773.23598.python-list@python.org>
	<d166cf7a-4ce5-4857-9d24-e095f73c2e6b@p3g2000pra.googlegroups.com>
	<4b8da0f4$0$8783$c3e8da3@news.astraweb.com>
Message-ID: <7x4okyb5w1.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
> (3) which implies that all JSON files are valid RSON files.
>
> If you reject the logical conclusion that RSON must therefore also be too 
> hard to edit, then perhaps JSON isn't too hard to edit either.

I would say that JSON is hard to edit because, among other things, it
has no comment syntax.  It's quite difficult to maintain a hand-edited
JSON file, or figure out what to edit into it, if it can't have any
comments in it describing what it's doing.  JSON is a serialization
format for machine to machine communication, not intended for hand
editing.  Simply adding a comment syntax to JSON would go a long way
towards making it easier to edit.


From news123 at free.fr  Tue Mar  2 19:38:21 2010
From: news123 at free.fr (News123)
Date: Wed, 03 Mar 2010 01:38:21 +0100
Subject: python 2.6: how to modify a PIL image from C without copying forth
	and back
Message-ID: <4b8daf7d$0$2868$426a74cc@news.free.fr>

Hi,

I created a grayscale image with PIL.

Now I would like to write a C function, which reads a;most all pixels
and will modify a few of them.


My current approach is:
- transform the image to a string()
- create a byte array huge enough to contain the resulting image
- call my c_function, which copies over the entire image in order
   to modify a few pixels
How can I achieve this with the least amount of copies?


########## Python code snippet ################

im = Image.open('grayscalefile_onebyteperpixel')
wx,wy = im.size

# create a string in order to pass it to my function
# I'm afraid this involves copying so  want to get rid of it
im_as_string = im.tostring()

# create a byte array in order to store my result
new_img_array = array.array('B', [0]*(wx*wy) )


# my function which should just change some pixels has
# to copy all unmodified pixels
my_extension.my_func(wx,wy,im_as_string,new_img_array)


im = Image.frombuffer('L',(wx,wy),new_img_array)
show(im2)

############ C wrapper code snippet ###############

    int wx,wy;
    Py_buffer img;
    Py_buffer new_img;
    Py_buffer table;
    unsigned char *img_ptr;
    unsigned char *new_img_ptr;

    int ok = PyArg_ParseTuple(args,
        "iis*w*",&wx,&wy,&img,&new_img);
    img_ptr = (unsigned char *) img.buf;
    new_img_ptr = (unsigned char *) new_img.buf;
    my_func(wx,wy,img_ptr,new_img_ptr);


Thanks in advance for any suggestions to make this more efficient.


bye


N



From python at mrabarnett.plus.com  Tue Mar  2 19:53:22 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 03 Mar 2010 00:53:22 +0000
Subject: Multiprocessing problem
In-Reply-To: <4B8D7C23.7050905@sidefx.com>
References: <4B8D7C23.7050905@sidefx.com>
Message-ID: <4B8DB302.1010102@mrabarnett.plus.com>

Matt Chaput wrote:
> Hi,
> 
> I'm having a problem with the multiprocessing package.
> 
> I'm trying to use a simple pattern where a supervisor object starts a 
> bunch of worker processes, instantiating them with two queues (a job 
> queue for tasks to complete and an results queue for the results). The 
> supervisor puts all the jobs in the "job" queue, then join()s the 
> workers, and then pulls all the completed results off the "results" queue.
> 
> (I don't think I can just use something like Pool.imap_unordered for 
> this because the workers need to be objects with state.)
> 
> Here's a simplified example:
> 
> http://pastie.org/850512
> 
> The problem is that seemingly randomly, but almost always, the worker 
> processes will deadlock at some point and stop working before they 
> complete. This will leave the whole program stalled forever. This seems 
> more likely the more work each worker does (to the point where adding 
> the time.sleep(0.01) as seen in the example code above guarantees it). 
> The problem seems to occur on both Windows and Mac OS X.
> 
> I've tried many random variations of the code (e.g. using JoinableQueue, 
> calling cancel_join_thread() on one or both queues even though I have no 
> idea what it does, etc.) but keep having the problem.
> 
> Am I just using multiprocessing wrong? Is this a bug? Any advice?
> 
There's a difference between multithreading and multiprocessing.

In multithreading the threads share the same address space, so objects
can be passed between the threads simply by passing references to those
objects.

In multiprocessing, however, the process don't share an address space,
so the objects themselves need to be transferred between the processes
via pipes, but the pipes have a limited capacity.

If the main process doesn't get the results from the queue until the
worker processes terminate, and the worker processes don't terminate
until they've put their results in the queue, and the pipe consequently
fills up, then deadlock can result.


From python at mrabarnett.plus.com  Tue Mar  2 20:00:11 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 03 Mar 2010 01:00:11 +0000
Subject: Queue peek?
In-Reply-To: <1267567723.4101.28.camel@localhost.localdomain>
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>	<58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>	<mailman.138.1267559095.23598.python-list@python.org>	<hmjqkr$r46$1@news.eternal-september.org>	<eae285401003021233i7a62771h590a557341f10ca4@mail.gmail.com>	<hmk1er$mlb$1@dough.gmane.org>
	<1267567723.4101.28.camel@localhost.localdomain>
Message-ID: <4B8DB49B.8070008@mrabarnett.plus.com>

John Krukoff wrote:
> On Tue, 2010-03-02 at 22:54 +0100, mk wrote:
> <snip>
>> No need to use synchro primitives like locks?
>>
>> I know that it may work, but that strikes me as somehow wrong... I'm 
>> used to using things like Lock().acquire() and Lock().release() when 
>> accessing shared data structures, whatever they are.
> <snip>
> 
> This is one of those places where the GIL is a good thing, and makes
> your life simpler. You could consider it that the interpreter does the
> locking for you for such primitive operations, if you like.

I suppose it depends on the complexity of the data structure. A dict's
methods are threadsafe, for example, but if you have a data structure
where access leads to multiple method calls then collectively they need
a lock.


From matt at whoosh.ca  Tue Mar  2 20:07:49 2010
From: matt at whoosh.ca (Matt Chaput)
Date: Tue, 02 Mar 2010 20:07:49 -0500
Subject: Multiprocessing problem
In-Reply-To: <4B8DB302.1010102@mrabarnett.plus.com>
References: <4B8D7C23.7050905@sidefx.com>
	<4B8DB302.1010102@mrabarnett.plus.com>
Message-ID: <4B8DB665.2080602@whoosh.ca>

> If the main process doesn't get the results from the queue until the
> worker processes terminate, and the worker processes don't terminate
> until they've put their results in the queue, and the pipe consequently
> fills up, then deadlock can result.

The queue never fills up... on platforms with qsize() I can see this. I 
remove items from the results queue as I add to the job queue, and if I 
add timeouts everywhere the workers never raise Empty and the supervisor 
never raises Full. They just deadlock.

I've rewritten the code so the worker threads don't push information 
back while they run, they just write to a temporary file which the 
supervisor can read, which avoids the issue. But if anyone can tell me 
what I was doing wrong for future reference, I'd greatly appreciate it.

Thanks,

Matt


From jcb at iteris.com  Tue Mar  2 20:45:31 2010
From: jcb at iteris.com (Metalone)
Date: Tue, 2 Mar 2010 17:45:31 -0800 (PST)
Subject: Multiprocessing.Pipe is not concurrently bi-directional (design 
	flaw?)
Message-ID: <7dbf688d-a86f-4e8d-a183-59673ed28f29@m35g2000prh.googlegroups.com>

I wanted to use Multiprocessing.Pipe and Multiprocessing.Process to
peform Actor style communication.
However, I just can't get what I need done, and I think it is due to
inherit problems with the design of Pipe.

If I have a process like this
def process1(conn):
    while True:
        msg = conn.recv()
        if msg == 'go':
            res = go()           # this is a long running function
            conn.send(res)   # send result back to caller
        elif msg == 'stop':
            stop() # this is intended to stop the go() function, for
example using deciding to abort operation.

In this code the 'stop' message cannot be received, because the code
is in the long running go() function.
So lets change it.

def process1(conn):
    while True:
        msg = conn.recv()
        if msg == 'go':
            t = threading.Thread(target=go, args=(conn,))
            t.start()
        elif msg == 'stop':
            stop() # this is intended to stop the go() function.

Now the thread-1 is waiting on the blocking recv().
If the go() function completes on thread-2, it wants to send its
result via the connection object, but it can't because
the connection is in use.

Trying to work around this gets complicated.
For example, using a second process and a second connection object to
read the 'stop' message, and then changing a shared memory flag to
stop the go() function.

Pipes not being concurrently bi-directional appears to be a design
flaw to me.
pyCSP appears to be an interesting approach, but it does not support
communication across O.S. processes on Win32.


From jcb at iteris.com  Tue Mar  2 21:11:27 2010
From: jcb at iteris.com (Metalone)
Date: Tue, 2 Mar 2010 18:11:27 -0800 (PST)
Subject: Multiprocessing.Pipe is not concurrently bi-directional (design 
	flaw?)
References: <7dbf688d-a86f-4e8d-a183-59673ed28f29@m35g2000prh.googlegroups.com>
Message-ID: <8f0cf159-bfb4-4def-82c7-9a99bd9cbebe@z10g2000prh.googlegroups.com>

Well, I just realized that I could use a separate pipe to send the
result back.  This might work ok.


From pmaupin at gmail.com  Tue Mar  2 21:26:38 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Tue, 2 Mar 2010 18:26:38 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
	<hmi5ns$57b$1@dough.gmane.org> <hmjena$n1p$1@dough.gmane.org> 
	<mailman.128.1267552773.23598.python-list@python.org>
	<d166cf7a-4ce5-4857-9d24-e095f73c2e6b@p3g2000pra.googlegroups.com>
	<4b8da0f4$0$8783$c3e8da3@news.astraweb.com>
Message-ID: <e055ea11-07b4-4f4a-9d45-68ed12473005@m37g2000yqf.googlegroups.com>

On Mar 2, 5:36?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> You seem to be taking the position that if you start with a config file
> config.json, it is "too hard to edit", but then by renaming it to
> config.rson it magically becomes easier to edit. That *is* ludicrous.

No, but that seems to be the position you keep trying to ascribe to
me: "Wait a minute... if JSON is too hard to edit, and RSON is a
*superset* of JSON, that means by definition every JSON file is also a
valid RSON file.  Since JSON is too hard to manually edit, so is
RSON."

> Perhaps what you mean to say is that JSON *can be* (not is) too hard to
> edit, and RSON *can be* too hard to edit too, but RSON has additional
> benefits, including being easier to edit *sometimes*.

I have said as much, in multiple prior postings on this thread, if you
care to look.

> So far you have done (in my opinion) a really poor job of explaining what
> those benefits are.

That's certainly a valid complaint, and I can certainly believe that's
true (and I'm going to be working on the doc some more), but instead
of making this complaint, you made the (still silly IMO) assertion
that a superset has to be as unreadable as the base set.

> You've bad-mouthed existing config formats, then
> tried to convince us that RSON is almost exactly the same as one of those formats apart from a couple of trivial changes of spelling (True for true, etc.).

This is conflating two different issues.  In a lame attempt to show
the silliness of the argument that the superset must be as bad as the
subset, I was trying to explain that, if you make a very few changes,
Python is a superset of JSON.  However, my lame attempt at this was
obviously as poorly thought out as some of the rest of my words,
because it started an additional discussion that wasn't really germane
to the real issues about configuration files.

> In my opinion, if you're going to get any traction with RSON, you need to
> demonstrate some examples of where JSON actually is hard to write, and
> show how RSON makes it easier. It's not good enough showing badly written
> JSON, it has to be examples that can't be written less badly given the
> constraints of JSON.

Agreed, and I will be working on that.

Best regards,
Pat


From python at mrabarnett.plus.com  Tue Mar  2 21:37:23 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 03 Mar 2010 02:37:23 +0000
Subject: Multiprocessing.Pipe is not concurrently bi-directional (design
	flaw?)
In-Reply-To: <8f0cf159-bfb4-4def-82c7-9a99bd9cbebe@z10g2000prh.googlegroups.com>
References: <7dbf688d-a86f-4e8d-a183-59673ed28f29@m35g2000prh.googlegroups.com>
	<8f0cf159-bfb4-4def-82c7-9a99bd9cbebe@z10g2000prh.googlegroups.com>
Message-ID: <4B8DCB63.80201@mrabarnett.plus.com>

Metalone wrote:
> Well, I just realized that I could use a separate pipe to send the
> result back.  This might work ok.

Or you could call .poll on the pipe and sleep if there's no input yet.


From victor.stinner at haypocalc.com  Tue Mar  2 21:37:44 2010
From: victor.stinner at haypocalc.com (Victor Stinner)
Date: Wed, 3 Mar 2010 03:37:44 +0100
Subject: Challenge: escape from the pysandbox
In-Reply-To: <fbe2e2101002281440n419fbcb1v2cf3922db1cef6a4@mail.gmail.com>
References: <201002261329.33740.victor.stinner@haypocalc.com>
	<hmeamq$a0$1@panix5.panix.com>
	<fbe2e2101002281440n419fbcb1v2cf3922db1cef6a4@mail.gmail.com>
Message-ID: <201003030337.44915.victor.stinner@haypocalc.com>

Le dimanche 28 f?vrier 2010 23:40:59, Daniel Fetchinson a ?crit :
> >>I guess they also have some kind of a sandbox if they let people run
> >>python on their machines, I'm not sure if it's open source though.
> >
> > Thing is, I'm sure that Google uses a critical backstop to any
> > Python-based sandbox: something like a chroot jail.  The Python sandbox
> > is mostly there to inform you about what you can and can't do; the real
> > security is provided by the OS.
> 
> I see, makes perfect sense. This then raises the question whether it's
> important to have a 100% fool proof python sandbox without help from
> the OS, or this goal is not only too ambitious but also not really a
> useful one. 

This is just impossible :-) PHP tried that but it's too hard to write an 
exhaustive blacklist because too much code have to be modified. If you require 
a 100% fool proof sandbox, you have to use a sandbox between the Python 
process and the OS (and not inside the Python process).

> One aspect might be that one might want to have a platform
> independent way of sandboxing, perhaps.

The problem have to be splitted in two parts: protect access to OS resources 
(files, network, etc.) and protect access to Python objects (eg. create a read 
only view of objects injected to the sandbox).

An "OS sandbox" can not protect objects inside the Python object. And 
pysandbox cannot protect all access to OS resources (but I try to do that 
:-)).

pysandbox is a possible solution to the second problem: control Python object 
space.
-- 
Victor Stinner
http://www.haypocalc.com/


From victor.stinner at haypocalc.com  Tue Mar  2 21:42:51 2010
From: victor.stinner at haypocalc.com (Victor Stinner)
Date: Wed, 3 Mar 2010 03:42:51 +0100
Subject: Challenge: escape from the pysandbox
In-Reply-To: <201002281743.07452.victor.stinner@haypocalc.com>
References: <201002261329.33740.victor.stinner@haypocalc.com>
	<fbe2e2101002270937n79ed285bh1715671e3c5a2958@mail.gmail.com>
	<201002281743.07452.victor.stinner@haypocalc.com>
Message-ID: <201003030342.51801.victor.stinner@haypocalc.com>

Le dimanche 28 f?vrier 2010 17:43:07, Victor Stinner a ?crit :
> Yes, Google AppEngine has its Python sandbox and the source code is
>  available online. I don't know the license. I found 7 vulnerabilities in 1
>  hour :-) I contacted Google security team. (...) There are other
>  differences, but I prefer to wait for the answer from
>  Google before telling you more :)

Google answered me. I misunderstood AppEngine sandbox. It's not a Python 
sandbox.

AppEngine sandbox is just a tool helping developers to test programs without 
the "real" (OS) sandbox. Their Python sandbox *emulates* the real sandbox, and 
so it's completly different to pysandbox.

-- 
Victor Stinner
http://www.haypocalc.com/


From alfps at start.no  Tue Mar  2 21:54:20 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 03 Mar 2010 03:54:20 +0100
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <e055ea11-07b4-4f4a-9d45-68ed12473005@m37g2000yqf.googlegroups.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
	<hmi5ns$57b$1@dough.gmane.org> <hmjena$n1p$1@dough.gmane.org>
	<mailman.128.1267552773.23598.python-list@python.org>
	<d166cf7a-4ce5-4857-9d24-e095f73c2e6b@p3g2000pra.googlegroups.com>
	<4b8da0f4$0$8783$c3e8da3@news.astraweb.com>
	<e055ea11-07b4-4f4a-9d45-68ed12473005@m37g2000yqf.googlegroups.com>
Message-ID: <hmkj0v$n0l$1@news.eternal-september.org>

* Patrick Maupin:
> On Mar 2, 5:36 pm, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
>> You seem to be taking the position that if you start with a config file
>> config.json, it is "too hard to edit", but then by renaming it to
>> config.rson it magically becomes easier to edit. That *is* ludicrous.
> 
> No, but that seems to be the position you keep trying to ascribe to
> me: "Wait a minute... if JSON is too hard to edit, and RSON is a
> *superset* of JSON, that means by definition every JSON file is also a
> valid RSON file.  Since JSON is too hard to manually edit, so is
> RSON."

Just a heads-up: IME it's next to impossible (maybe actually impossible) to 
convince Steven that your position is not the one he ascribes to you. At least 
not without an extremely lengthy debate veering off on multiple similar tangents 
plus some that one would never dream of. So I'd give up on that.

Anyway, I agree with the sentiments expressed by many in this thread that what's 
important is the established "eco-culture", not the editability.

Thus, even though XML isn't all that editable it's what I'd choose by default 
for rich configuration information, regardless of whether some simpler to edit 
alternative existed. Simply because there are so many XML tools out there, and 
people know about XML. It's like MS-DOS once became popular in spite of being 
extremely technically imperfect for its purpose, and then Windows... :-)


Cheers,

- Alf


From ftp-wg-owner at hethmon.com  Tue Mar  2 21:58:11 2010
From: ftp-wg-owner at hethmon.com (ftp-wg-owner at hethmon.com)
Date: Wed, 3 Mar 2010 09:58:11 +0700
Subject: Xgyxkcxxpy
Message-ID: <20100303025835.EE602EE9AB@mail.python.org>

Dear user of python.org,

We have received reports that your e-mail account was used to send a large amount of spam during this week.
Most likely your computer was compromised and now contains a trojaned proxy server.

We recommend you to follow instruction in order to keep your computer safe.

Best wishes,
python.org technical support team.

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From barry at python.org  Tue Mar  2 22:17:44 2010
From: barry at python.org (Barry Warsaw)
Date: Tue, 2 Mar 2010 22:17:44 -0500
Subject: Python 2.6.5 release candidate 1 now available
Message-ID: <20100302221744.7ee4d3dd@heresy.wooz.org>

Hello everyone,

The source tarballs and Windows installer for Python 2.6.5 release candidate 1
are now available:

http://www.python.org/download/releases/2.6.5/

Please download them, install them, and try to use them with your favorite
projects and environments.  If no regressions are found, we will do the final
release on Monday March 15, 2010.  Please test the release candidate as
much as possible in the meantime, and help make 2.6.5 a rock solid release!

Thanks,
-Barry

P.S. The Mac installer will hopefully be available soon.
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From max at alcyone.com  Tue Mar  2 22:20:34 2010
From: max at alcyone.com (Erik Max Francis)
Date: Tue, 02 Mar 2010 19:20:34 -0800
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <e055ea11-07b4-4f4a-9d45-68ed12473005@m37g2000yqf.googlegroups.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
	<hmi5ns$57b$1@dough.gmane.org> <hmjena$n1p$1@dough.gmane.org>
	<mailman.128.1267552773.23598.python-list@python.org>
	<d166cf7a-4ce5-4857-9d24-e095f73c2e6b@p3g2000pra.googlegroups.com>
	<4b8da0f4$0$8783$c3e8da3@news.astraweb.com>
	<e055ea11-07b4-4f4a-9d45-68ed12473005@m37g2000yqf.googlegroups.com>
Message-ID: <FqqdnYyyH84fSBDWnZ2dnUVZ_jqdnZ2d@giganews.com>

Patrick Maupin wrote:
> On Mar 2, 5:36 pm, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
>> You seem to be taking the position that if you start with a config file
>> config.json, it is "too hard to edit", but then by renaming it to
>> config.rson it magically becomes easier to edit. That *is* ludicrous.
> 
> No, but that seems to be the position you keep trying to ascribe to
> me: "Wait a minute... if JSON is too hard to edit, and RSON is a
> *superset* of JSON, that means by definition every JSON file is also a
> valid RSON file.  Since JSON is too hard to manually edit, so is
> RSON."

Huh?  That's the argument being used against you, not the argument being 
ascribed to you.  You're getting confused about something, somewhere.

-- 
Erik Max Francis && max at alcyone.com && http://www.alcyone.com/max/
  San Jose, CA, USA && 37 18 N 121 57 W && AIM/Y!M/Skype erikmaxfrancis
   I wonder if heaven got a ghetto
    -- Tupac Shakur


From prakash.stack at gmail.com  Tue Mar  2 22:25:32 2010
From: prakash.stack at gmail.com (prakash jp)
Date: Wed, 3 Mar 2010 08:55:32 +0530
Subject: How to use python to register a service (an existing .exe file)
In-Reply-To: <4b79e28c$0$4610$426a74cc@news.free.fr>
References: <4b79e28c$0$4610$426a74cc@news.free.fr>
Message-ID: <805f59d51003021925s27c8c489o9a25c23caef22fda@mail.gmail.com>

Hi all,

plz find the attachment, thats how u register services Pythonically:


Regards
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From pmaupin at gmail.com  Tue Mar  2 22:35:20 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Tue, 2 Mar 2010 19:35:20 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
	<hmi5ns$57b$1@dough.gmane.org> <hmjena$n1p$1@dough.gmane.org> 
	<mailman.128.1267552773.23598.python-list@python.org>
	<d166cf7a-4ce5-4857-9d24-e095f73c2e6b@p3g2000pra.googlegroups.com>
	<4b8da0f4$0$8783$c3e8da3@news.astraweb.com>
	<e055ea11-07b4-4f4a-9d45-68ed12473005@m37g2000yqf.googlegroups.com>
	<FqqdnYyyH84fSBDWnZ2dnUVZ_jqdnZ2d@giganews.com>
Message-ID: <9f3569ec-aaef-451a-a275-2459e693927f@g26g2000yqn.googlegroups.com>

On Mar 2, 9:20?pm, Erik Max Francis <m... at alcyone.com> wrote:
> Patrick Maupin wrote:
> > On Mar 2, 5:36 pm, Steven D'Aprano <st... at REMOVE-THIS-
> > cybersource.com.au> wrote:
> >> You seem to be taking the position that if you start with a config file
> >> config.json, it is "too hard to edit", but then by renaming it to
> >> config.rson it magically becomes easier to edit. That *is* ludicrous.
>
> > No, but that seems to be the position you keep trying to ascribe to
> > me: "Wait a minute... if JSON is too hard to edit, and RSON is a
> > *superset* of JSON, that means by definition every JSON file is also a
> > valid RSON file. ?Since JSON is too hard to manually edit, so is
> > RSON."
>
> Huh? ?That's the argument being used against you, not the argument being
> ascribed to you. ?You're getting confused about something, somewhere.
>
> --
> Erik Max Francis && m... at alcyone.com &&http://www.alcyone.com/max/
> ? San Jose, CA, USA && 37 18 N 121 57 W && AIM/Y!M/Skype erikmaxfrancis
> ? ?I wonder if heaven got a ghetto
> ? ? -- Tupac Shakur

Yes, it is very confusing.  Steven used that purported argument
against me, and then since I disagreed with it, it apparently meant
that I was arguing that changing the file extension type (which I've
never even proposed or discussed, btw) from json to rson somehow
magically makes a preexisting file all better.  I have a headache now,
and it will only get worse, so that's really all I have left to say
about this issue.

Best regards,
Pat


From prakash.stack at gmail.com  Tue Mar  2 22:36:42 2010
From: prakash.stack at gmail.com (prakash jp)
Date: Wed, 3 Mar 2010 09:06:42 +0530
Subject: How to use python to register a service (an existing .exe file)
In-Reply-To: <881a0df5-872f-4c19-a989-fe3ffe775655@k2g2000pro.googlegroups.com>
References: <4b79e28c$0$4610$426a74cc@news.free.fr>
	<881a0df5-872f-4c19-a989-fe3ffe775655@k2g2000pro.googlegroups.com>
Message-ID: <805f59d51003021936y53af0759q663fbd131c7fa432@mail.gmail.com>

Code of SmallestService.py is at:

http://book.opensourceproject.org.cn/lamp/python/pythonwin/

Regards
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From lie.1296 at gmail.com  Tue Mar  2 22:51:52 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Wed, 03 Mar 2010 14:51:52 +1100
Subject: Is this secure?
In-Reply-To: <mailman.187.1267039205.4577.python-list@python.org>
References: <mailman.110.1266935711.4577.python-list@python.org>	<7xtyt72200.fsf@ruckus.brouhaha.com>	<d8a401bf-6dfa-4e41-bea0-8cbf12f8d6e0@o3g2000vbo.googlegroups.com>	<7x3a0r8hyr.fsf@ruckus.brouhaha.com>	<mailman.169.1267032213.4577.python-list@python.org>	<hm3p7l$hr$1@news.urz.uni-heidelberg.de>	<hm3rgu$kvd$1@dough.gmane.org>	<hm3t1f$qbj$1@dough.gmane.org>
	<mailman.187.1267039205.4577.python-list@python.org>
Message-ID: <4b8ddcf6$1@dnews.tpgi.com.au>

On 02/25/2010 06:16 AM, mk wrote:
> On 2010-02-24 20:01, Robert Kern wrote:
>> I will repeat my advice to just use random.SystemRandom.choice() instead
>> of trying to interpret the bytes from /dev/urandom directly.
> 
> Out of curiosity:
> 
> def gen_rand_string(length):
>     prng = random.SystemRandom()
>     chars = []
>     for i in range(length):
>         chars.append(prng.choice('abcdefghijklmnopqrstuvwxyz'))
>     return ''.join(chars)
> 
> if __name__ == "__main__":
>     chardict = {}
>     for i in range(10000):
> ##        w = gen_rand_word(10)
>         w = gen_rand_string(10)
>         count_chars(chardict, w)
>     counts = list(chardict.items())
>     counts.sort(key = operator.itemgetter(1), reverse = True)
>     for char, count in counts:
>         print char, count
> 
> 
> s 3966
> d 3912
> g 3909
> h 3905
> a 3901
> u 3900
> q 3891
> m 3888
> k 3884
> b 3878
> x 3875
> v 3867
> w 3864
> y 3851
> l 3825
> z 3821
> c 3819
> e 3819
> r 3816
> n 3808
> o 3797
> f 3795
> t 3784
> p 3765
> j 3730
> i 3704
> 
> Better, although still not perfect.
> 

I give you this:

I give you this:

import itertools
def gen():
    valid_chars = 'abcdefghijklmnopqrstuvwxyz'
    for char in itertools.repeat(valid_chars):
        yield char

gen = gen()
def gen_rand_string(length):
    chars = (next(gen) for i in range(length))
    return ''.join(chars)

since it gives me a perfect distribution of letters, it must be a very
secure random password generation scheme.


From lie.1296 at gmail.com  Tue Mar  2 22:59:01 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Wed, 03 Mar 2010 14:59:01 +1100
Subject: cpan for python?
In-Reply-To: <2010030214473616807-tomfsessile@gmailcom>
References: <mailman.20.1267367545.23598.python-list@python.org>
	<hmjv4b$mqk$1@reader1.panix.com>
	<2010030214473616807-tomfsessile@gmailcom>
Message-ID: <4b8ddea4$1@dnews.tpgi.com.au>

On 03/03/2010 09:47 AM, TomF wrote:
> On 2010-03-02 13:14:50 -0800, R Fritz <rfritz at u.washington.edu> said:
> 
>> On 2010-02-28 06:31:56 -0800, ssteinerX at gmail.com said:
>>>
>>> On Feb 28, 2010, at 9:28 AM, Someone Something wrote:
>>>
>>>> Is there something like cpan for python? I like python's syntax, but
>>>> Iuse perl because of cpan and the tremendous modules that it has.  --
>>>
>>> Please search the mailing list archives.
>>>
>>> This subject has been discussed to absolute death.
>>
>> But somehow the question is not in the FAQ, though the answer is. See:
>>  
>> <http://www.python.org/doc/faq/library/#how-do-i-find-a-module-or-application-to-perform-task-x>
>>
> 
> There
> is also a program called cpan, distributed with Perl.  It is used for
> searching, downloading, installing and testing modules from the CPAN
> repository.  It's far more extensive than setuptools.  AFAIK the python
> community has developed nothing like it.

python have easy_install



From john at castleamber.com  Tue Mar  2 23:58:47 2010
From: john at castleamber.com (John Bokma)
Date: Tue, 02 Mar 2010 22:58:47 -0600
Subject: cpan for python?
References: <mailman.20.1267367545.23598.python-list@python.org>
	<hmjv4b$mqk$1@reader1.panix.com>
	<2010030214473616807-tomfsessile@gmailcom>
	<4b8ddea4$1@dnews.tpgi.com.au>
Message-ID: <87ljea9f20.fsf@castleamber.com>

Lie Ryan <lie.1296 at gmail.com> writes:

> On 03/03/2010 09:47 AM, TomF wrote:

[..]
 
>> There
>> is also a program called cpan, distributed with Perl.  It is used for
>> searching, downloading, installing and testing modules from the CPAN
>> repository.  It's far more extensive than setuptools.  AFAIK the python
>> community has developed nothing like it.
>
> python have easy_install


How easy is it to /remove/ something? ;-) (Last time I checked I read
something like "manually remove the .egg"...

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar  3 00:00:37 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 03 Mar 2010 05:00:37 GMT
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
	<hmi5ns$57b$1@dough.gmane.org> <hmjena$n1p$1@dough.gmane.org>
	<mailman.128.1267552773.23598.python-list@python.org>
	<d166cf7a-4ce5-4857-9d24-e095f73c2e6b@p3g2000pra.googlegroups.com>
	<4b8da0f4$0$8783$c3e8da3@news.astraweb.com>
	<e055ea11-07b4-4f4a-9d45-68ed12473005@m37g2000yqf.googlegroups.com>
	<FqqdnYyyH84fSBDWnZ2dnUVZ_jqdnZ2d@giganews.com>
	<9f3569ec-aaef-451a-a275-2459e693927f@g26g2000yqn.googlegroups.com>
Message-ID: <pan.2010.03.03.05.00.38@REMOVE.THIS.cybersource.com.au>

On Tue, 02 Mar 2010 19:35:20 -0800, Patrick Maupin wrote:

> Yes, it is very confusing.  Steven used that purported argument against
> me, and then since I disagreed with it, it apparently meant that I was
> arguing that changing the file extension type (which I've never even
> proposed or discussed, btw) from json to rson 

My argument is *figurative*, not literal.


> somehow magically makes a preexisting file all better.

You might not have intended that ludicrous conclusion, but it was implied 
by some of your posts, particularly the early ones. Of course I don't 
think that you *actually* believe the conclusion.

I believe that, whatever the real or imagined benefit of RSON over JSON, 
in this thread you have attempted to over-sell RSON while giving 
relatively little justification for it.

I wish you every success in your project, but think that it is off-topic 
for a Python discussion group.




-- 
Steven


From ben+python at benfinney.id.au  Wed Mar  3 00:17:16 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 03 Mar 2010 16:17:16 +1100
Subject: cpan for python?
References: <mailman.20.1267367545.23598.python-list@python.org>
	<hmjv4b$mqk$1@reader1.panix.com>
	<2010030214473616807-tomfsessile@gmailcom>
	<4b8ddea4$1@dnews.tpgi.com.au>
Message-ID: <873a0ix9ur.fsf@benfinney.id.au>

Lie Ryan <lie.1296 at gmail.com> writes:

> On 03/03/2010 09:47 AM, TomF wrote:
> > There is also a program called cpan, distributed with Perl. It is
> > used for searching, downloading, installing and testing modules from
> > the CPAN repository. It's far more extensive than setuptools. AFAIK
> > the python community has developed nothing like it.
>
> python have easy_install

Indeed. And that program is nothing like the Perl ?cpan? program.

-- 
 \           ?Value your freedom or you will lose it, teaches history. |
  `\     ?Don't bother us with politics,? respond those who don't want |
_o__)                               to learn.? ?Richard Stallman, 2002 |
Ben Finney


From greg.ewing at canterbury.ac.nz  Wed Mar  3 00:18:28 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Wed, 03 Mar 2010 18:18:28 +1300
Subject: Docstrings considered too complicated
In-Reply-To: <mailman.59.1267456634.23598.python-list@python.org>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>
	<4B8B9845.70604@sequans.com>
	<mailman.59.1267456634.23598.python-list@python.org>
Message-ID: <7v695nFa0fU1@mid.individual.net>

MRAB wrote:

> BTW, the first programming I did was in hexadecimal (C4xx was "LDI xx").

Hey, a SC/MP! That was my first programming language,
too. What sort of machine was it in?

-- 
Greg


From greg.ewing at canterbury.ac.nz  Wed Mar  3 00:30:00 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Wed, 03 Mar 2010 18:30:00 +1300
Subject: Docstrings considered too complicated
In-Reply-To: <hmk60h$nce$1@reader1.panix.com>
References: <20100224212303.242222c6@geekmail.INVALID>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <kyoevn.k63@spenarnc.xs4all.nl>
	<hmk60h$nce$1@reader1.panix.com>
Message-ID: <7v69rcFcmeU1@mid.individual.net>

Grant Edwards wrote:

> Just a mediocre copy of the CP/M filesystem, which was in turn
> copied from DEC's RSTS or RSX.

It was actually an improvement over CP/M's file
system. CP/M didn't have hierarchical directories
or timestamps and recorded file sizes in 128-byte
blocks rather than bytes.

-- 
Greg


From max at alcyone.com  Wed Mar  3 00:36:42 2010
From: max at alcyone.com (Erik Max Francis)
Date: Tue, 02 Mar 2010 21:36:42 -0800
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <9f3569ec-aaef-451a-a275-2459e693927f@g26g2000yqn.googlegroups.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
	<hmi5ns$57b$1@dough.gmane.org> <hmjena$n1p$1@dough.gmane.org>
	<mailman.128.1267552773.23598.python-list@python.org>
	<d166cf7a-4ce5-4857-9d24-e095f73c2e6b@p3g2000pra.googlegroups.com>
	<4b8da0f4$0$8783$c3e8da3@news.astraweb.com>
	<e055ea11-07b4-4f4a-9d45-68ed12473005@m37g2000yqf.googlegroups.com>
	<FqqdnYyyH84fSBDWnZ2dnUVZ_jqdnZ2d@giganews.com>
	<9f3569ec-aaef-451a-a275-2459e693927f@g26g2000yqn.googlegroups.com>
Message-ID: <__adnWP-2__2aBDWnZ2dnUVZ_h2dnZ2d@giganews.com>

Patrick Maupin wrote:
> On Mar 2, 9:20 pm, Erik Max Francis <m... at alcyone.com> wrote:
>> Patrick Maupin wrote:
>>> On Mar 2, 5:36 pm, Steven D'Aprano <st... at REMOVE-THIS-
>>> cybersource.com.au> wrote:
>>>> You seem to be taking the position that if you start with a config file
>>>> config.json, it is "too hard to edit", but then by renaming it to
>>>> config.rson it magically becomes easier to edit. That *is* ludicrous.
>>> No, but that seems to be the position you keep trying to ascribe to
>>> me: "Wait a minute... if JSON is too hard to edit, and RSON is a
>>> *superset* of JSON, that means by definition every JSON file is also a
>>> valid RSON file.  Since JSON is too hard to manually edit, so is
>>> RSON."
>> Huh?  That's the argument being used against you, not the argument being
>> ascribed to you.  You're getting confused about something, somewhere.
> 
> Yes, it is very confusing.  Steven used that purported argument
> against me, and then since I disagreed with it, it apparently meant
> that I was arguing that changing the file extension type (which I've
> never even proposed or discussed, btw) from json to rson somehow
> magically makes a preexisting file all better.

No, that was not the point he was making.  You should reread more 
carefully (and be aware of sarcasm).

-- 
Erik Max Francis && max at alcyone.com && http://www.alcyone.com/max/
  San Jose, CA, USA && 37 18 N 121 57 W && AIM/Y!M/Skype erikmaxfrancis
   Perfect situations must go wrong
    -- Florence, _Chess_


From greg.ewing at canterbury.ac.nz  Wed Mar  3 00:40:00 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Wed, 03 Mar 2010 18:40:00 +1300
Subject: Docstrings considered too complicated
In-Reply-To: <877hpuxpdf.fsf@benfinney.id.au>
References: <20100224212303.242222c6@geekmail.INVALID>	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>	<20100227191040.6c77f2d8@geekmail.INVALID>	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>	<20100301140943.4edca16b@geekmail.INVALID>	<4b8be8f7$1@dnews.tpgi.com.au>	<20100301182255.3de59bc6@geekmail.INVALID>	<mailman.66.1267465347.23598.python-list@python.org>	<20100301212954.7aa0b99d@geekmail.INVALID>	<87eik3zmi8.fsf@benfinney.id.au>	<20100302184056.743a71e7@geekmail.INVALID>	<mailman.129.1267553139.23598.python-list@python.org>	<20100302225156.67171851@geekmail.INVALID>
	<877hpuxpdf.fsf@benfinney.id.au>
Message-ID: <7v6ae4Ff37U1@mid.individual.net>

Ben Finney wrote:

> Just as customers should demand both that a building be built to do its
> job well, *and* that its architectural plans meet measurable, testable
> industry standards of quality for independent re-use at some
> indeterminate later date.

A problem is that it's very hard to come up with
*measurable* standards of code quality.

There's no equivalent in the software world of
specifying a grade of steel or type of sand.
The things that really matter are all subjective.

-- 
Greg


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar  3 00:48:49 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 03 Mar 2010 05:48:49 GMT
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
	<87eik3zmi8.fsf@benfinney.id.au>
	<20100302184056.743a71e7@geekmail.INVALID>
	<mailman.129.1267553139.23598.python-list@python.org>
	<20100302225156.67171851@geekmail.INVALID>
	<877hpuxpdf.fsf@benfinney.id.au> <7v6ae4Ff37U1@mid.individual.net>
Message-ID: <pan.2010.03.03.05.48.49@REMOVE.THIS.cybersource.com.au>

On Wed, 03 Mar 2010 18:40:00 +1300, Gregory Ewing wrote:

> Ben Finney wrote:
> 
>> Just as customers should demand both that a building be built to do its
>> job well, *and* that its architectural plans meet measurable, testable
>> industry standards of quality for independent re-use at some
>> indeterminate later date.
> 
> A problem is that it's very hard to come up with *measurable* standards
> of code quality.
> 
> There's no equivalent in the software world of specifying a grade of
> steel or type of sand. The things that really matter are all subjective.

True, but one can look at "best practice", or even "standard practice". 
For Python coders, using docstrings is standard practice if not best 
practice. Using strings as comments is not.

Or one can simply use *reason*: what justification is there for putting 
comments in strings at the top of the function? The only one I can see is 
if you are writing for an embedded device, you may want to remove doc 
strings to save memory -- and even that is implementation dependent.

What justification is there for putting docstrings in functions? Code 
becomes self-documenting, you can run Python tools that extract and run 
doctests, standard tools in the standard library work, other coders will 
immediately understand what you have done, and (unlike the behaviour of 
string-comments) the behaviour of docstrings is guaranteed by the 
language.

Unless you are writing for an embedded devise, there is NO objective 
reason for putting comments in strings above the function, and MANY 
objective reasons for putting them into docstrings. Okay, this isn't 
quite the same as measuring the strength of concrete under compression, 
but it's not a subjective choice like "tea or coffee?".



-- 
Steven


From greg.ewing at canterbury.ac.nz  Wed Mar  3 01:14:41 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Wed, 03 Mar 2010 19:14:41 +1300
Subject: Queue peek?
In-Reply-To: <mailman.156.1267578012.23598.python-list@python.org>
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>	<58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>	<mailman.138.1267559095.23598.python-list@python.org>	<hmjqkr$r46$1@news.eternal-september.org>	<eae285401003021233i7a62771h590a557341f10ca4@mail.gmail.com>	<hmk1er$mlb$1@dough.gmane.org>	<1267567723.4101.28.camel@localhost.localdomain>
	<mailman.156.1267578012.23598.python-list@python.org>
Message-ID: <7v6cf4FnnrU1@mid.individual.net>

MRAB wrote:

> I suppose it depends on the complexity of the data structure. A dict's
> methods are threadsafe, for example, but if you have a data structure
> where access leads to multiple method calls then collectively they need
> a lock.

It also depends on the nature of the objects being used
as dict keys. Dict operations invoke the hashing and
comparison methods of the keys, which in general can
execute arbitrary Python code.

If the keys are elementary built-in types such as
strings or ints, then dict operations will *probably*
be atomic. But I think I'd use a lock anyway, to be
on the safe side.

-- 
Greg


From groups at sonic.net  Wed Mar  3 01:18:11 2010
From: groups at sonic.net (Isaac)
Date: Tue, 2 Mar 2010 22:18:11 -0800
Subject: Need bluez/python ( PyBluez) method to access BlueZ data- Please Help!
Message-ID: <4b8dff1e$0$22093$742ec2ed@news.sonic.net>

Hi,

I need to access data that is handled and stored in the BlueZ file system, 
but is, unfortunately, not available via the current BlueZ D-Bus API.

That is, the data I need is parsed by BlueZ, but not provided in the current 
D-Bus signal.

I need a method or interface that does not rely on the D-Bus API and can 
directly access the BlueZ file system to get this parsed data.

Can PyBlueZ do this? If not, any suggestions would be immensely appreciated.

Thanks!
Isaac 




From greg.ewing at canterbury.ac.nz  Wed Mar  3 01:23:27 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Wed, 03 Mar 2010 19:23:27 +1300
Subject: case do problem
In-Reply-To: <hmjjnn$arj$1@news.eternal-september.org>
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
	<hmjjnn$arj$1@news.eternal-september.org>
Message-ID: <7v6cviFq18U1@mid.individual.net>

Alf P. Steinbach wrote:
> * Tracubik:
 >
>> iterations=0;
>> count=0;
>> REPEAT;
>>   iterations = iterations+1;
>>   ...
>>   IF (genericCondition) THEN count=count+1;
>>   ...
>>   CASE count OF:
>>     1: m = 1
>>         2: m = 10
>>         3: m = 100
> 
> Uhm, is this syntactically valid Pascal? As I recall, every Pascal 
> construct was delimited in some way.

I think it's okay. Pascal's control structures such as
if-then and while-do mostly take single statements and
didn't have an ending keyword. If you want multiple
statements in the body you have to put begin-end around
them.

Putting a semicolon after REPEAT is stylistically a
bit odd, but it's not wrong.

-- 
Greg


From timr at probo.com  Wed Mar  3 01:34:29 2010
From: timr at probo.com (Tim Roberts)
Date: Tue, 02 Mar 2010 22:34:29 -0800
Subject: python 2.6: how to modify a PIL image from C without copying
	forth and back
References: <4b8daf7d$0$2868$426a74cc@news.free.fr>
Message-ID: <8m0so5d5lmgg3dombnssflnt1jh6h0ka3v@4ax.com>

News123 <news123 at free.fr> wrote:
>
>I created a grayscale image with PIL.
>
>Now I would like to write a C function, which reads a;most all pixels
>and will modify a few of them.
>
>My current approach is:
>- transform the image to a string()
>- create a byte array huge enough to contain the resulting image
>- call my c_function, which copies over the entire image in order
>   to modify a few pixels
>How can I achieve this with the least amount of copies?

If it were me, I'd be tempted to go peek at the source code for PIL, then
pass the Image object to my C routine and poke at the innards to find the
buffer with the pixels.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From admin at mail.psa-software.com  Wed Mar  3 01:41:53 2010
From: admin at mail.psa-software.com (EVZYN)
Date: Wed, 3 Mar 2010 07:41:53 +0100
Subject: =?windows-1251?B?7+7x7O7y8OXy/CDv7vDt7iD06Ov87CDv8O4g6vPt6Ovo7ePz8Q==?=
Message-ID: <828A25931378487BB0D14EA4A0EFFCE8@server>

An HTML attachment was scrubbed...
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From greg.ewing at canterbury.ac.nz  Wed Mar  3 01:52:02 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Wed, 03 Mar 2010 19:52:02 +1300
Subject: Writing an assembler in Python
In-Reply-To: <kyo49n.gr4@spenarnc.xs4all.nl>
References: <Xns9D28186AF890Cfdnbgui7uhu5h8hrnuio@127.0.0.1>
	<kyo49n.gr4@spenarnc.xs4all.nl>
Message-ID: <7v6el6F1ddU1@mid.individual.net>

> In article <Xns9D28186AF890Cfdnbgui7uhu5h8hrnuio at 127.0.0.1>,
> Giorgos Tzampanakis  <gt67 at hw.ac.uk> wrote:
> 
>>I'm implementing a CPU that will run on an FPGA. I want to have a
>>(dead) simple assembler that will generate the machine code for
>>me. I want to use Python for that. Are there any libraries that
>>can help me with the parsing of the assembly code?

I wrote a PIC assembler in Python once. I didn't bother
with any parsing libraries. I used a regular expression
to split the input into tokens, then wrote ad-hoc
parsing code in Python.

-- 
Greg


From pankaj.kr at gmail.com  Wed Mar  3 02:03:31 2010
From: pankaj.kr at gmail.com (Pankaj)
Date: Tue, 2 Mar 2010 23:03:31 -0800 (PST)
Subject: timeout restart in pexpect
Message-ID: <f05f83f3-22e6-49a6-b9d0-cf74ee6acf33@o16g2000prh.googlegroups.com>

I am using pexpect to automate some procedures.

My procedures are time cosuming, some messages coming out from that,
in failure cases it will not output anything.

So I would like to give small timeout value but when some message is
received, it should restart the timeout, similar like
"restart_timeout_upon_receive" in perl.

Is it possible in Python using pexpect ?


From i3enhamin at gmail.com  Wed Mar  3 02:06:13 2010
From: i3enhamin at gmail.com (Ben Racine)
Date: Tue, 2 Mar 2010 23:06:13 -0800
Subject: nonunique string replacements
Message-ID: <6E340E6F-59D9-4E26-9491-F0891AD9B6F0@gmail.com>

All,

Say I have a string "l" ...

l = 'PBUSH     201005       K      1.      1.      1.      1.      1.      1.'

And I want to replace the first "   1." with a "500.2" and the second "  1." with " 5.2" ...

What pythonic means would you all recommend?

Note the whitespace is equal between the existing substring and the replacement string.

Many thanks,
Ben Racine
i3enhamin at gmail.com





From anand.shashwat at gmail.com  Wed Mar  3 02:36:13 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Wed, 3 Mar 2010 13:06:13 +0530
Subject: nonunique string replacements
In-Reply-To: <6E340E6F-59D9-4E26-9491-F0891AD9B6F0@gmail.com>
References: <6E340E6F-59D9-4E26-9491-F0891AD9B6F0@gmail.com>
Message-ID: <d4ab53de1003022336t1176925fyb9d32b88eb4b31de@mail.gmail.com>

>>> s = 'PBUSH     201005       K      500      1.      1.      1.
1.      1.'    #Your original string here

>>> l    #Create your desired list
['500.2', '5.2', '5.3', '5.4', '5.5', '5.6', '5.7']

>>> lsep = s.count(' 1.')    #Count the occurrence of seperators

>>> for i in range(lsep):    #Replace all of them by values in list l, one
by one
...     f = s.find(' 1.')
...     s = s[:f] + l[i] + s[f+3:]
...
>>> s    #Your final string
'PBUSH     201005       K      500     500.2     5.2     5.3     5.4
5.5'


~l0nwlf

On Wed, Mar 3, 2010 at 12:36 PM, Ben Racine <i3enhamin at gmail.com> wrote:

> All,
>
> Say I have a string "l" ...
>
> l = 'PBUSH     201005       K      1.      1.      1.      1.      1.
>  1.'
>
> And I want to replace the first "   1." with a "500.2" and the second "
>  1." with " 5.2" ...
>
> What pythonic means would you all recommend?
>
> Note the whitespace is equal between the existing substring and the
> replacement string.
>
> Many thanks,
> Ben Racine
> i3enhamin at gmail.com
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From andreengels at gmail.com  Wed Mar  3 03:09:35 2010
From: andreengels at gmail.com (Andre Engels)
Date: Wed, 3 Mar 2010 09:09:35 +0100
Subject: case do problem
In-Reply-To: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
Message-ID: <6faf39c91003030009h10ad0737xec87012ec5f0395@mail.gmail.com>

On Tue, Mar 2, 2010 at 6:46 PM, Tracubik <affdfsdfdsfsd at b.com> wrote:

>  and, generally
> speaking, the try..except block slow down the execution of the program or
> not?

Try...except tends to be slow when the exception does occur, fast when
it does not. Apart from that, if these
fraction-of-a-fraction-of-a-second gains are important to you, Python
is not the programming language for you.

In Python, it seems to be common to do optimization after rather than
during the main coding, and then only when it is necessary and only
where it matters. That is:
1. Program your solution without looking much at speed issues
2. Check if it is fast enough. If so, ready.
3. If not, see which parts of the program are being slow
4. Optimize only those parts of the program that have been identified in step 3

-- 
Andr? Engels, andreengels at gmail.com


From tomf.sessile at gmail.com  Wed Mar  3 03:23:16 2010
From: tomf.sessile at gmail.com (TomF)
Date: Wed, 3 Mar 2010 00:23:16 -0800
Subject: cpan for python?
References: <mailman.20.1267367545.23598.python-list@python.org>
	<hmjv4b$mqk$1@reader1.panix.com>
	<2010030214473616807-tomfsessile@gmailcom>
	<4b8ddea4$1@dnews.tpgi.com.au>
Message-ID: <2010030300231675249-tomfsessile@gmailcom>

On 2010-03-02 19:59:01 -0800, Lie Ryan <lie.1296 at gmail.com> said:

> On 03/03/2010 09:47 AM, TomF wrote:
>> On 2010-03-02 13:14:50 -0800, R Fritz <rfritz at u.washington.edu> said:
>> 
>>> On 2010-02-28 06:31:56 -0800, ssteinerX at gmail.com said:
>>>> 
>>>> On Feb 28, 2010, at 9:28 AM, Someone Something wrote:
>>>> 
>>>>> Is there something like cpan for python? I like python's syntax, but
>>>>> Iuse perl because of cpan and the tremendous modules that it has.  --
>>>> 
>>>> Please search the mailing list archives.
>>>> 
>>>> This subject has been discussed to absolute death.
>>> 
>>> But somehow the question is not in the FAQ, though the answer is. See:
>>> 
>>> <http://www.python.org/doc/faq/library/#how-do-i-find-a-module-or-application-to-perform-task-x>


There 
>>> 
>> is also a program called cpan, distributed with Perl.  It is used for
>> searching, downloading, installing and testing modules from the CPAN
>> repository.  It's far more extensive than setuptools.  AFAIK the python
>> community has developed nothing like it.
> 
> python have easy_install

easy_install is part of setuptools.  As I said, nothing like cpan.

-Tom



From lipun4u at gmail.com  Wed Mar  3 03:33:17 2010
From: lipun4u at gmail.com (asit)
Date: Wed, 3 Mar 2010 00:33:17 -0800 (PST)
Subject: process mp3 file
Message-ID: <6fc7b483-c9a9-4581-991c-f816a2701526@g8g2000pri.googlegroups.com>

Somebody suggest me a python library for processing mp3 file.  Here I
don't want to play the file.

Thank you


From __peter__ at web.de  Wed Mar  3 03:39:54 2010
From: __peter__ at web.de (Peter Otten)
Date: Wed, 03 Mar 2010 09:39:54 +0100
Subject: case do problem
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
Message-ID: <hml77p$k1v$00$1@news.t-online.com>

Tracubik wrote:

> hi, i've to convert from Pascal this code:

program loop;

function generic_condition: boolean;
begin
   generic_condition := random > 0.7
end;

procedure loop;
var
   iterations, count, m: integer;
begin
   iterations := 0;
   count := 0;
   m := 0;
   repeat
      iterations := iterations+1;
      (*...*)
      writeln(iterations:2, count:2, m:4);
      (*...*)
      if generic_condition then
	    inc(count);
      (*...*)
      case count of
	1: m := 1;
	2: m := 10;
	3: m := 100
      end
   until (count = 4) or (iterations = 20)
end;

begin
   loop;
   writeln("That's all, folks")
end.

Hey, I have a Pascal compiler just one apt-get away ;)

Here's how I'd translate the above, without trying to be too clever:

from random import random

def generic_condition():
    return random() > 0.7

def loop():
    count = 0
    m = 0
    lookup = {1: 1, 2: 10, 3: 100}
    for iterations in range(20): # off by one
        # ...
        print "%2d %1d %3d" % (iterations, count, m)
        # ...
        if generic_condition():
            count += 1
        # ...
        m = lookup.get(count, m)
        if count == 4:
            break

if __name__ == "__main__":
    loop()
    print "That's all, folks"

Something must be wrong with me today because I find the Pascal code /more/ 
readable...

Peter


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar  3 03:42:01 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 03 Mar 2010 08:42:01 GMT
Subject: nonunique string replacements
References: <mailman.166.1267599978.23598.python-list@python.org>
Message-ID: <pan.2010.03.03.08.42.01@REMOVE.THIS.cybersource.com.au>

On Tue, 02 Mar 2010 23:06:13 -0800, Ben Racine wrote:

> All,
> 
> Say I have a string "l" ...
> 
> l = 'PBUSH     201005       K      1.      1.      1.      1.      1.   
>   1.'
> 
> And I want to replace the first "   1." with a "500.2" and the second " 
> 1." with " 5.2" ...
> 
> What pythonic means would you all recommend?

l = l.replace("   1.", "500.2", 1)
l = l.replace("   1.", "5.2", 1)






-- 
Steven


From news123 at free.fr  Wed Mar  3 03:43:21 2010
From: news123 at free.fr (News123)
Date: Wed, 03 Mar 2010 09:43:21 +0100
Subject: python 2.6: how to modify a PIL image from C without copying
	forth and back
In-Reply-To: <8m0so5d5lmgg3dombnssflnt1jh6h0ka3v@4ax.com>
References: <4b8daf7d$0$2868$426a74cc@news.free.fr>
	<8m0so5d5lmgg3dombnssflnt1jh6h0ka3v@4ax.com>
Message-ID: <4b8e2129$0$8262$426a34cc@news.free.fr>

Hi Tim,

Tim Roberts wrote:
> News123 <news123 at free.fr> wrote:
>> I created a grayscale image with PIL.
>>
>> Now I would like to write a C function, which reads a;most all pixels
>> and will modify a few of them.
>>
>> My current approach is:
>> - transform the image to a string()
>> - create a byte array huge enough to contain the resulting image
>> - call my c_function, which copies over the entire image in order
>>   to modify a few pixels
>> How can I achieve this with the least amount of copies?
> 
> If it were me, I'd be tempted to go peek at the source code for PIL, then
> pass the Image object to my C routine and poke at the innards to find the
> buffer with the pixels.

Yes, this might be an option
Somehow though it didn't feel right for me to depend on internal non
documented data types, which might change between releases of PIL.

N


From __peter__ at web.de  Wed Mar  3 03:49:38 2010
From: __peter__ at web.de (Peter Otten)
Date: Wed, 03 Mar 2010 09:49:38 +0100
Subject: nonunique string replacements
References: <mailman.166.1267599978.23598.python-list@python.org>
Message-ID: <hml7q0$9ie$03$1@news.t-online.com>

Ben Racine wrote:

> Say I have a string "l" ...
> 
> l = 'PBUSH     201005       K      1.      1.      1.      1.      1.     
> 1.'
> 
> And I want to replace the first "   1." with a "500.2" and the second " 
> 1." with " 5.2" ...
> 
> What pythonic means would you all recommend?

With regular expressions:

>>> import re
>>> replacements = iter(["one", "two", "three"])
>>> re.compile("replaceme").sub(lambda m: next(replacements), "foo replaceme 
bar replaceme baz replaceme bang")
'foo one bar two baz three bang'

With string methods:

>>> replacements = iter(["", "one", "two", "three"])
>>> "".join(a + b for a, b in zip(replacements, "foo replaceme bar replaceme 
baz replaceme bang".split("replaceme")))
'foo one bar two baz three bang'

Peter


From __peter__ at web.de  Wed Mar  3 04:05:02 2010
From: __peter__ at web.de (Peter Otten)
Date: Wed, 03 Mar 2010 10:05:02 +0100
Subject: Image.frombuffer and warning
References: <4b8dada2$0$6285$426a74cc@news.free.fr>
Message-ID: <hml8ms$mte$00$1@news.t-online.com>

News123 wrote:

> I am using the PIL function from_buffer in python 2.6.4
> 
> I am having the line
> im2 = Image.frombuffer('L',(wx,wy),buf)
> 
> 
> I receive the warning:
>> ./pytest.py:63: RuntimeWarning: the frombuffer defaults may change in
> a future release; for portability, change the call to read:
>>   frombuffer(mode, size, data, 'raw', mode, 0, 1)
>>   im2 = Image.frombuffer('L',(wx,wy),buf)
> 
> 
> Naively I assumed, that changing my code to
> 
> 
> im2 = Image.frombuffer('L',(wx,wy),buf,'raw','L',0,1)
> 
> 
> should fix the issue:
> 
> However I receive exactly the same error as before.
> 
> What am I doing wrong?

I cannot reproduce the problem:

$ cat frombuffer.py
import sys
import Image
wx = 3
wy = 2
buf = "a"*wx*wy
if "--fixed" in sys.argv:
    Image.frombuffer("L", (wx, wy), buf, "raw", "L", 0, 1)
else:
    Image.frombuffer("L", (wx, wy), buf)

$ python frombuffer.py
frombuffer.py:9: RuntimeWarning: the frombuffer defaults may change in a 
future release; for portability, change the call to read:
  frombuffer(mode, size, data, 'raw', mode, 0, 1)
  Image.frombuffer("L", (wx, wy), buf)
$ python frombuffer.py --fixed
$ python -c"import Image; print Image.VERSION"
1.1.6
$ python -V
Python 2.6.4

Peter


From stefan_ml at behnel.de  Wed Mar  3 04:10:22 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 03 Mar 2010 10:10:22 +0100
Subject: python 2.6: how to modify a PIL image from C without copying
	forth and back
In-Reply-To: <4b8daf7d$0$2868$426a74cc@news.free.fr>
References: <4b8daf7d$0$2868$426a74cc@news.free.fr>
Message-ID: <hml91u$13j$1@dough.gmane.org>

News123, 03.03.2010 01:38:
> I created a grayscale image with PIL.
>
> Now I would like to write a C function, which reads a;most all pixels
> and will modify a few of them.
>
> My current approach is:
> - transform the image to a string()
> - create a byte array huge enough to contain the resulting image
> - call my c_function, which copies over the entire image in order
>     to modify a few pixels
> How can I achieve this with the least amount of copies?

Take a look at Cython instead, it will allow you to access PIL's image 
buffer directly, instead of copying the data. It will also simplify and 
speed up your C wrapper code.

Stefan



From deets at nospam.web.de  Wed Mar  3 04:17:57 2010
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 03 Mar 2010 10:17:57 +0100
Subject: conditional import into global namespace
In-Reply-To: <mailman.142.1267562515.23598.python-list@python.org>
References: <hmjita$ms4$1@dough.gmane.org>	<16651e81003021031h3831d4b3i844f331f3d301042@mail.gmail.com>
	<mailman.142.1267562515.23598.python-list@python.org>
Message-ID: <7v6nq5Ffv2U1@mid.uni-berlin.de>

Am 02.03.10 21:41, schrieb mk:
> Jerry Hill wrote:
>> Just import subprocess at the top of your module. If subprocess
>> hasn't been imported yet, it will be imported when your module is
>> loaded. If it's already been imported, your module will use the
>> cached version that's already been imported.
>>
>> In other words, it sounds like Python already does what you want. You
>> don't need to do anything special.
>
> Oh, thanks!
>
> Hmm it's different than dealing with packages I guess -- IIRC, in
> packages only code in package's __init__.py was executed?

I don't understand this. But there is no difference regarding caching & 
execution between packages and modules.

Importing a package will execute the __init__.py, yes. But only once. As 
will importing modules execute them, but only once.

All subsequent imports will just return the created module-object. 
Unless you import something under a new name! That is, you can alter the 
sys.path and then import a package/module under a different name - 
python won't detect that.

Simplest example ist this:

---- test.py ----

class Foo(object):

    pass

if __name__ == "__main__":
    import test # import ourselves
    # this holds, because we have
    # __main__.Foo and test.Foo
    assert Foo is not test.Foo

---- test.py ----

However, unless you mess with python, this is none of your concern.

Diez


From orenelrad at gmail.com  Wed Mar  3 04:27:16 2010
From: orenelrad at gmail.com (Oren Elrad)
Date: Wed, 3 Mar 2010 04:27:16 -0500
Subject: Interest check in some delicious syntactic sugar for "except:pass"
Message-ID: <35e00b331003030127y11b4964ev8c71417a2599eeec@mail.gmail.com>

Howdy all, longtime appreciative user, first time mailer-inner.

I'm wondering if there is any support (tepid better than none) for the
following syntactic sugar:

silence:
........ block

------------------------->

try:
........block
except:
........pass

The logic here is that there are a ton of "except: pass" statements[1]
floating around in code that do not need to be there. Meanwhile, the
potential keyword 'silence' does not appear to be in significant use
as a variable[2], or an alternative keyword might be imagined
('quiet', 'hush', 'stfu') but I somewhat like the verbiness of
'silence' since that is precisely what it does to the block (that is,
you have to inflect it as a verb, not a noun -- you are telling the
block to be silent). Finally, since this is the purest form of
syntactic sugar, I cannot fathom any parsing, interpreting or other
complications that would arise.

I appreciate any feedback, including frank statements that you'd
rather not trifle with such nonsense.

~Oren

[1] http://www.google.com/codesearch?q=except%3A\spass&hl=en
[2] http://www.google.com/codesearch?hl=en&lr=&q=silence+lang%3Apy


From news123 at free.fr  Wed Mar  3 04:37:43 2010
From: news123 at free.fr (News123)
Date: Wed, 03 Mar 2010 10:37:43 +0100
Subject: python 2.6: how to modify a PIL image from C without copying
	forth and back
In-Reply-To: <mailman.169.1267607707.23598.python-list@python.org>
References: <4b8daf7d$0$2868$426a74cc@news.free.fr>
	<mailman.169.1267607707.23598.python-list@python.org>
Message-ID: <4b8e2de8$0$21576$426a74cc@news.free.fr>

Hi Stefan,

Stefan Behnel wrote:
> News123, 03.03.2010 01:38:
>> I created a grayscale image with PIL.
>>
>> Now I would like to write a C function, which reads a;most all pixels
>> and will modify a few of them.
>>
>> My current approach is:
>> - transform the image to a string()
>> - create a byte array huge enough to contain the resulting image
>> - call my c_function, which copies over the entire image in order
>>     to modify a few pixels
>> How can I achieve this with the least amount of copies?
> 
> Take a look at Cython instead, it will allow you to access PIL's image
> buffer directly, instead of copying the data. It will also simplify and
> speed up your C wrapper code.
> 
> Stefan
> 

I don't know Cython. Having looked at the web site I'm not entirely
sure, I understood your suggestion.

Do you mean
-  to stay with Python 2.6 and to implement only my extension in Cython.
This might be very attractive. If yes, can you recommend some url's /
tutorials / etc. which might help to implement a cython extension for
python2.6. which reads and modifies a pixel of a PIL image.

or do you mean
- to switch entirely from Python 2.6 to Cython. I would be reluctant to
do so, as I have already a lot of existing code. and I do not have the
time to check the entire code base for portability issues



thanks in advance


N


From phil at freehackers.org  Wed Mar  3 04:40:24 2010
From: phil at freehackers.org (BlueBird)
Date: Wed, 3 Mar 2010 01:40:24 -0800 (PST)
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
Message-ID: <b4859d9f-2dec-4c1b-af27-b720345871a5@b7g2000yqd.googlegroups.com>

On Feb 24, 9:23?pm, Andreas Waldenburger <use... at geekmail.INVALID>
wrote:
> Hi all,
>
> a company that works with my company writes a lot of of their code in
> Python (lucky jerks). I've seen their code and it basically looks like
> this:
>
> """Function that does stuff"""
> def doStuff():
> ? ? while not wise(up):
> ? ? ? ? yield scorn
>
> Now my question is this: How do I kill these people without the
> authorities thinking they didn't deserve it?

If they are generating their doc with doxygen, I think it's the right
choice. See:

http://www.stack.nl/~dimitri/doxygen/docblocks.html#pythonblocks

Oops, after a second look, doxygen needs comments before the function,
not doc strings.

Philippe


From news123 at free.fr  Wed Mar  3 04:44:26 2010
From: news123 at free.fr (News123)
Date: Wed, 03 Mar 2010 10:44:26 +0100
Subject: Image.frombuffer and warning
In-Reply-To: <hml8ms$mte$00$1@news.t-online.com>
References: <4b8dada2$0$6285$426a74cc@news.free.fr>
	<hml8ms$mte$00$1@news.t-online.com>
Message-ID: <4b8e2f7a$0$13729$426a74cc@news.free.fr>

Hi Peter,

Peter Otten wrote:
> News123 wrote:
> I cannot reproduce the problem:
> 
> $ cat frombuffer.py
> import sys
> import Image
> wx = 3
> wy = 2
> buf = "a"*wx*wy
> if "--fixed" in sys.argv:
>     Image.frombuffer("L", (wx, wy), buf, "raw", "L", 0, 1)
> else:
>     Image.frombuffer("L", (wx, wy), buf)
> 
> $ python frombuffer.py
> frombuffer.py:9: RuntimeWarning: the frombuffer defaults may change in a 
> future release; for portability, change the call to read:
>   frombuffer(mode, size, data, 'raw', mode, 0, 1)
>   Image.frombuffer("L", (wx, wy), buf)
> $ python frombuffer.py --fixed
> $ python -c"import Image; print Image.VERSION"
> 1.1.6
> $ python -V
> Python 2.6.4
> 
> Peter

You're absolutely right. It was my error.
I shouldn't do any lat night coding :-(.

I fixed one frombuffer() statement, but overlooked a second one in my
code :-(


Apologies


N




From pankaj.kr at gmail.com  Wed Mar  3 04:50:27 2010
From: pankaj.kr at gmail.com (Pankaj)
Date: Wed, 3 Mar 2010 01:50:27 -0800 (PST)
Subject: exp_internal in pexpect
Message-ID: <4aa75aa4-e89b-40b9-b84a-c25ecf907815@l12g2000prg.googlegroups.com>

how to enable expect log in pexpect ? (similar as exp_internal in
expect)


From stefan_ml at behnel.de  Wed Mar  3 05:10:21 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 03 Mar 2010 11:10:21 +0100
Subject: python 2.6: how to modify a PIL image from C without copying
	forth and back
In-Reply-To: <4b8e2de8$0$21576$426a74cc@news.free.fr>
References: <4b8daf7d$0$2868$426a74cc@news.free.fr>	<mailman.169.1267607707.23598.python-list@python.org>
	<4b8e2de8$0$21576$426a74cc@news.free.fr>
Message-ID: <hmlcie$dl2$1@dough.gmane.org>

News123, 03.03.2010 10:37:
> Stefan Behnel wrote:
>> Take a look at Cython instead, it will allow you to access PIL's image
>> buffer directly, instead of copying the data. It will also simplify and
>> speed up your C wrapper code.
>
> I don't know Cython. Having looked at the web site I'm not entirely
> sure, I understood your suggestion.
>
> Do you mean
> -  to stay with Python 2.6 and to implement only my extension in Cython.

Absolutely.


> This might be very attractive. If yes, can you recommend some url's /
> tutorials / etc. which might help to implement a cython extension for
> python2.6. which reads and modifies a pixel of a PIL image.

Check out the tutorial on the web site, and ask on the cython-users mailing 
list about integration with PIL. I'm sure you'll get some useful examples.

Here's something closely related, although it doesn't really use PIL (but 
the mechanisms are the same):

http://wiki.cython.org/examples/mandelbrot


> or do you mean
> - to switch entirely from Python 2.6 to Cython. I would be reluctant to
> do so, as I have already a lot of existing code. and I do not have the
> time to check the entire code base for portability issues

The nice thing about Cython is that you always have a normal CPython 
interpreter running, so you can split your code between the interpreter and 
the compiler at any level of granularity. However, the advice was really to 
write your image processing algorithm in Cython, not your entire program.

Stefan



From geoff.bache at jeppesen.com  Wed Mar  3 05:14:08 2010
From: geoff.bache at jeppesen.com (geoffbache)
Date: Wed, 3 Mar 2010 02:14:08 -0800 (PST)
Subject: PYTHONPATH and eggs
Message-ID: <86ee3b75-b3f5-4172-90c8-e90f0e50b89f@a18g2000yqc.googlegroups.com>

Hi all,

I have a very simple problem that seems to have no simple solution.

I have a module which is installed centrally and lives in a Python
egg. I have experimented with some minor changes to it and would like
to set my PYTHONPATH to pick up my local copy of it, but don't want to
have to figure out how to build my own version of the "egg" if
possible.

Unfortunately, the location from PYTHONPATH ends up after the eggs in
sys.path so I can't persuade Python to import my version. The only way
I've found to fix it is to copy the main script and manually hack
sys.path at the start of it which isn't really very nice. I wonder if
there is any better way as I can't be the first person to want to do
this, surely?

I've seen this issue has been discussed elsewhere and flagged as a
problem (e.g.
http://mail.python.org/pipermail/distutils-sig/2009-January/010755.html)

but I've been unable to find any suggestions for workarounds or
indications whether this will be/has been fixed.

Regards,
Geoff Bache


From clp2 at rebertia.com  Wed Mar  3 05:25:02 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 3 Mar 2010 02:25:02 -0800
Subject: Interest check in some delicious syntactic sugar for 
	"except:pass"
In-Reply-To: <35e00b331003030127y11b4964ev8c71417a2599eeec@mail.gmail.com>
References: <35e00b331003030127y11b4964ev8c71417a2599eeec@mail.gmail.com>
Message-ID: <50697b2c1003030225j28c18507r619cf15aeddb8c41@mail.gmail.com>

On Wed, Mar 3, 2010 at 1:27 AM, Oren Elrad <orenelrad at gmail.com> wrote:
> Howdy all, longtime appreciative user, first time mailer-inner.
>
> I'm wondering if there is any support (tepid better than none) for the
> following syntactic sugar:
>
> silence:
> ........ block
>
> ------------------------->
>
> try:
> ........block
> except:
> ........pass
>
> The logic here is that there are a ton of "except: pass" statements[1]
> floating around in code that do not need to be there.

So, why exactly should the language /encourage/ unnecessary error
silencing? (which is what the proposed sugar would do)

> I appreciate any feedback

Applicable rules of The Zen[1] that the proposal arguably violates:
*Special cases aren't special enough to break the rules.
*There should be one-- and preferably only one --obvious way to do it.

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

[1]: http://www.python.org/dev/peps/pep-0020/


From clp2 at rebertia.com  Wed Mar  3 05:25:42 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 3 Mar 2010 02:25:42 -0800
Subject: process mp3 file
In-Reply-To: <6fc7b483-c9a9-4581-991c-f816a2701526@g8g2000pri.googlegroups.com>
References: <6fc7b483-c9a9-4581-991c-f816a2701526@g8g2000pri.googlegroups.com>
Message-ID: <50697b2c1003030225p2b32662ct960ad477d9d3c8f5@mail.gmail.com>

On Wed, Mar 3, 2010 at 12:33 AM, asit <lipun4u at gmail.com> wrote:
> Somebody suggest me a python library for processing mp3 file. ?Here I
> don't want to play the file.

Define "processing".

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


From davea at ieee.org  Wed Mar  3 05:40:56 2010
From: davea at ieee.org (Dave Angel)
Date: Wed, 03 Mar 2010 05:40:56 -0500
Subject: Interest check in some delicious syntactic sugar for "except:pass"
In-Reply-To: <35e00b331003030127y11b4964ev8c71417a2599eeec@mail.gmail.com>
References: <35e00b331003030127y11b4964ev8c71417a2599eeec@mail.gmail.com>
Message-ID: <4B8E3CB8.70302@ieee.org>

Oren Elrad wrote:
> Howdy all, longtime appreciative user, first time mailer-inner.
>
> I'm wondering if there is any support (tepid better than none) for the
> following syntactic sugar:
>
> silence:
> ........ block
>
> ------------------------->
>
> try:
> ........block
> except:
> ........pass
>
> The logic here is that there are a ton of "except: pass" statements[1]
> floating around in code that do not need to be there. Meanwhile, the
> potential keyword 'silence' does not appear to be in significant use
> as a variable[2], or an alternative keyword might be imagined
> ('quiet', 'hush', 'stfu') but I somewhat like the verbiness of
> 'silence' since that is precisely what it does to the block (that is,
> you have to inflect it as a verb, not a noun -- you are telling the
> block to be silent). Finally, since this is the purest form of
> syntactic sugar, I cannot fathom any parsing, interpreting or other
> complications that would arise.
>
> I appreciate any feedback, including frank statements that you'd
> rather not trifle with such nonsense.
>
> ~Oren
>
> [1] http://www.google.com/codesearch?q=except%3A\spass&hl=en
> [2] http://www.google.com/codesearch?hl=en&lr=&q=silence+lang%3Apy
>
>   
I presume you know that there's a feature freeze on for Python.  So such 
an idea wouldn't be considered for at least a couple of years.  But that 
shouldn't inhibit such discussions.

I wonder if you're intending that silence: denotes a block in which all 
exceptions would be ignored.  And that any calls made from there that 
threw exceptions would also be ignored.

If so, it's a bad idea.  Only if you could qualify it to a particular 
exception list might it be reasonable.  As it stands, it's just as bad 
as the bare try/except that you were already given.  Do you really want 
to ignore syntax errors, skip bad data, and ignore missing files, and 
generally plow down whatever execution path happens to result?


Just my opinion.
DaveA


From lipun4u at gmail.com  Wed Mar  3 05:43:38 2010
From: lipun4u at gmail.com (asit)
Date: Wed, 3 Mar 2010 02:43:38 -0800 (PST)
Subject: process mp3 file
References: <6fc7b483-c9a9-4581-991c-f816a2701526@g8g2000pri.googlegroups.com>
	<mailman.173.1267611946.23598.python-list@python.org>
Message-ID: <9ab3890c-14b9-4031-96c1-6f991469c9ae@m35g2000prh.googlegroups.com>


> Define "processing".

getting the title, song name, etc of the file and updating in a
database


From bruno.42.desthuilliers at websiteburo.invalid  Wed Mar  3 05:56:03 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 03 Mar 2010 11:56:03 +0100
Subject: Method / Functions - What are the differences?
In-Reply-To: <hmk1mn$70u$1@newsreader3.netcologne.de>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
	<mailman.109.1267539415.23598.python-list@python.org>
	<hmk1mn$70u$1@newsreader3.netcologne.de>
Message-ID: <4b8e4041$0$17447$426a34cc@news.free.fr>

Eike Welk a ?crit :
> John Posner wrote:
>> I've updated the text at this location:
>>
>>  >   http://cl1p.net/bruno_0301.rst/
> 
> I think this is a very useful writeup! 
> 
> It would be perfect with a little bit of introduction that says:
> 1. - What it is: "The rough details of method look-up";
> 2. - which contains some of the questions that that made that authors write 
> the text. This way people with similar questions can find it with Google.
> 

John, do you think you could something with the following ?

"""
"Is it a function ? is it a method ? No, it's... " - or : What's in a 
Python method ?

Python newcomers often have hard time understanding the "magic" behind 
Python's methods - and truth is that Python's object model can be a bit 
peculiar when compared to most mainstream (or not-so-mainstream) OOPLs. 
As a matter of fact, there are quite a few threads on c.l.py with either 
direct or indirect questions about what makes a Python method, and I 
must have explained the whole mechanism at least 3 or 4 times there. The 
following text is an edited version of my last attempt, as edited, 
corrected and published by John Posner, MayHisNameBePraised(tm).

This text isn't meant as a replacement for neither the official 
FineManual(tm)[XXX : relevant link] nor the very excellent - if somehow 
technical - 'Descriptors how-to' [XXX : relevant link]. It's mostly a 
brief but hopefully helpful overview of what exactly is a Python method, 
and how Python magically inserts the 'self' or 'cls' argument to method 
calls.
"""

Feel free to edit / amend / rewrite / trash at will - you're now 
officially in charge of publishing this text !-)



From andreengels at gmail.com  Wed Mar  3 06:02:32 2010
From: andreengels at gmail.com (Andre Engels)
Date: Wed, 3 Mar 2010 12:02:32 +0100
Subject: Interest check in some delicious syntactic sugar for 
	"except:pass"
In-Reply-To: <35e00b331003030127y11b4964ev8c71417a2599eeec@mail.gmail.com>
References: <35e00b331003030127y11b4964ev8c71417a2599eeec@mail.gmail.com>
Message-ID: <6faf39c91003030302l30105064n675b449b45ac1968@mail.gmail.com>

On Wed, Mar 3, 2010 at 10:27 AM, Oren Elrad <orenelrad at gmail.com> wrote:
> Howdy all, longtime appreciative user, first time mailer-inner.
>
> I'm wondering if there is any support (tepid better than none) for the
> following syntactic sugar:
>
> silence:
> ........ block
>
> ------------------------->
>
> try:
> ........block
> except:
> ........pass
>
> The logic here is that there are a ton of "except: pass" statements[1]
> floating around in code that do not need to be there. Meanwhile, the
> potential keyword 'silence' does not appear to be in significant use
> as a variable[2], or an alternative keyword might be imagined
> ('quiet', 'hush', 'stfu') but I somewhat like the verbiness of
> 'silence' since that is precisely what it does to the block (that is,
> you have to inflect it as a verb, not a noun -- you are telling the
> block to be silent). Finally, since this is the purest form of
> syntactic sugar, I cannot fathom any parsing, interpreting or other
> complications that would arise.
>
> I appreciate any feedback, including frank statements that you'd
> rather not trifle with such nonsense.

I would be against this, because "except: pass" is a terrible code
smell. Usage of exceptions can roughly be divided into two areas:

1. Cases where you do know quite well what might go wrong
2. Cases where all kind of stuff might go wrong, including things you
perhaps did not think of, and want to deal with all of them

In the first case, you should not use a blanket "except", but a more
specific one, catching only the specific error or errors you are
dealing with.

In the second case, a blanket except might well be correct, but in
that case, you should not want to pass over the error silently.
Usually you will want to notify the user that an error has occurred.
Even if that is not the case, you want to make some kind of logging of
the error, so that you have the chance of finding it if it is indeed
an unexpected (and therefore undoubtedly also unintended) error.

Doing a pass over an exception is not a bad thing in itself, but one
should only do it when one _knows_ that it is the right action to
take. If you have a general exception, you don't know _what_ has gone
wrong, so you sure as hell cannot be sure about what's the best action
to take. Doing nothing might well be your best guess, but even in that
case I want to know that your program has been guessing when I use it.

-- 
Andr? Engels, andreengels at gmail.com


From clp2 at rebertia.com  Wed Mar  3 06:06:55 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 3 Mar 2010 03:06:55 -0800
Subject: process mp3 file
In-Reply-To: <9ab3890c-14b9-4031-96c1-6f991469c9ae@m35g2000prh.googlegroups.com>
References: <6fc7b483-c9a9-4581-991c-f816a2701526@g8g2000pri.googlegroups.com>
	<mailman.173.1267611946.23598.python-list@python.org>
	<9ab3890c-14b9-4031-96c1-6f991469c9ae@m35g2000prh.googlegroups.com>
Message-ID: <50697b2c1003030306g1939a4bbg799e4f158f99f4c4@mail.gmail.com>

On Wed, Mar 3, 2010 at 2:43 AM, asit <lipun4u at gmail.com> wrote:
>> Define "processing".
>
> getting the title, song name, etc of the file and updating in a
> database

You'd want an ID3 tag library then. Here's one:

http://eyed3.nicfit.net/

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


From durumdara at gmail.com  Wed Mar  3 06:12:12 2010
From: durumdara at gmail.com (durumdara at gmail.com)
Date: Wed, 03 Mar 2010 12:12:12 +0100
Subject: easy install failed
Message-ID: <4B8E440C.2070204@gmail.com>

Hi!

Windows, Py2.6.

I read about Pyda and Spider. I used Pyscripter, Geany, ULIPAD, and 
COntext, and Netbeans with Python; but I want to try these products.

But easy_install failed on get them:

    C:\Python26\Scripts>easy_install.exe pida
    Searching for pida
    Reading http://pypi.python.org/simple/pida/
    Reading http://pida.co.uk/
    Reading http://pida.co.uk/download/
    Reading http://pida.vm.bytemark.co.uk/
    Reading http://code.google.com/p/pida/downloads/list
    Reading http://pida.berlios.de
    Reading http://pida.berlios.de/index.php/PIDA:Downloads
    Reading http://pida.berlios.de/downloads/
    Best match: pida 0.6beta3
    Downloading
    http://pypi.python.org/packages/source/p/pida/pida-0.6beta3.tar.gz#m
    d5=ecd790f5dd6f77eb4ebfc719f8e26114
    Processing pida-0.6beta3.tar.gz
    Running pida-0.6beta3\setup.py -q bdist_egg --dist-dir
    c:\docume~1\chris\locals~
    1\temp\easy_install-vd4hql\pida-0.6beta3\egg-dist-tmp-9zwwxx
    error: A rendszer nem tal?lja a megadott f?jlt
    {The system cannot found the file}

Many of packages are not installed on my system, because of "file" or 
"path" not found.

For example:

    C:\Python26\Scripts>easy_install.exe kiwi
    Searching for kiwi
    Reading http://pypi.python.org/simple/kiwi/
    Reading http://www.ivy.fr/kiwi
    Best match: kiwi 0.8.6
    Downloading http://www.ivy.fr/kiwi/kiwi-0.8.6.tar.gz
    Processing kiwi-0.8.6.tar.gz
    error: Couldn't find a setup script in
    c:\docume~1\chris\locals~1\temp\easy_inst
    all-dxia7w\kiwi-0.8.6.tar.gz

May these packages not have "setup.py"?
Or not working in Windows?
Or they have binaries somewhere, like pywin32, and wxpython?

THanks for your help:
     dd
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From orenelrad at gmail.com  Wed Mar  3 06:47:28 2010
From: orenelrad at gmail.com (Oren Elrad)
Date: Wed, 3 Mar 2010 06:47:28 -0500
Subject: Re Interest check in some delicious syntactic sugar for "except:pass"
Message-ID: <35e00b331003030347x30f3f2faua96a9b72814743da@mail.gmail.com>

To all that responded, thanks for the prompt response folks, your
criticisms are well taken. Coming from Cland, one is inculcated with
the notion that if the programmer wants to shoot himself in the foot
the language ought not to prevent that (or even should return him a
loaded magnum with the safety off and the hair-trigger pulled). My
apologies for not immediately grokking the cultural difference in
pytown.

With that said, let me at least offer a token defense of my position.
By way of motivation, I wrote that email after copying/pasting the
following a few times around a project until I wrote it into def
SilentlyDelete() and its cousin SilentlyRmdir()

""" code involving somefile """
try:
........os.remove(somefile)
except:
.......pass     # The bloody search indexer has got the file and I
can't delete it. Nothing to be done.

Certainly the parade of horribles (bad files! corrupt data! syntax
errors!) is a tad melodramatic. Either os.remove() succeeds or it
doesn't and the execution path (in the estimation of this programmer,
at least) is not at all impacted by whether it succeeds or fails. I
know with certainty at compile time what exceptions might be raised
and what the consequences of passing them are and there is no sense
pestering the user or sweating over it. Nor can I see the logic, as
was suggested, in writing "except OSError:" since (seems to me) mere
surplusage -- it neither causes a semantic difference in the way the
program runs nor provides anything useful to the reader.

Now, perhaps this is a special case that is not nearly special enough
to warrant its own syntactic sugar, I granted that much, but >30,000
examples in Google Code cannot be considered to be a complete corner
case either. Briefly skimming those results, most of them seem to be
of this flavor, not the insane programmer that wants to write
"silence: CommitDBChangesEmailWifeAndAdjustBankAccount()" nor novices
that aren't aware of what they might be ignoring.

At any rate (and since this is far more words than I had intended), I
want to reiterate that the criticism is well-taken as a cultural
matter. I just don't want everyone to think I'm bloody insane or that
I'm not aware this is playing with fire. Maybe we can put it in module
"YesImSureJustBloodyDoItAlreadyGoddamnit"  and prints an ASCII skull
and crossbones to the console when imported? :-P

~ Oren

PS. I did like Dave's suggestions that one might want to write
"silence Type1 Type2:" which I suppose goes a long way towards
alleviating the concern that the programmer doesn't know what he's
missing. Doesn't quite meet my desire (both syntaxes would be nice, of
course) to avoid the verbiage involved with explaining to the compiler
(or the next reader) something that it knows well enough by now (or
ought to know, at least).


From tibor.beck at hotmail.com  Wed Mar  3 06:57:13 2010
From: tibor.beck at hotmail.com (gentlestone)
Date: Wed, 3 Mar 2010 03:57:13 -0800 (PST)
Subject: monkey patching with @classmethod
Message-ID: <b4ecc2a9-0ef4-43fa-999d-fdfb23b2ee4f@c16g2000yqd.googlegroups.com>

Hi, is there some well-known problems with class method monkey
patching?

I've got this error message:

unbound method get_pocet_neocislovanych() must be called with Pozemok
instance as first argument (got Subjekt instance instead)

The method is declared as:
@classmethod
@monkeypatch(Dokument)
def get_pocet_neocislovanych(cls, subjekt):
    return cls.objects.filter(subjekt = subjekt, cislo__isnull =
True).count() # or pass, this line is not important

and the monkey patch decorator is declared as:
def monkeypatch(cls):
    def decorator(func):
        setattr(cls, func.__name__, func)
        return func
    return decorator

If I move the method to class declaration (whitout monkey patching),
everything is ok, but only if I've restarted the server.


From bruno.42.desthuilliers at websiteburo.invalid  Wed Mar  3 07:09:12 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 03 Mar 2010 13:09:12 +0100
Subject: monkey patching with @classmethod
In-Reply-To: <b4ecc2a9-0ef4-43fa-999d-fdfb23b2ee4f@c16g2000yqd.googlegroups.com>
References: <b4ecc2a9-0ef4-43fa-999d-fdfb23b2ee4f@c16g2000yqd.googlegroups.com>
Message-ID: <4b8e5161$0$23009$426a74cc@news.free.fr>

gentlestone a ?crit :
> Hi, is there some well-known problems with class method monkey
> patching?
> 
> I've got this error message:
> 
> unbound method get_pocet_neocislovanych() must be called with Pozemok
> instance as first argument (got Subjekt instance instead)

> The method is declared as:
> @classmethod
> @monkeypatch(Dokument)
> def get_pocet_neocislovanych(cls, subjekt):
>     return cls.objects.filter(subjekt = subjekt, cislo__isnull =
> True).count() # or pass, this line is not important
> 
> and the monkey patch decorator is declared as:
> def monkeypatch(cls):
>     def decorator(func):
>         setattr(cls, func.__name__, func)
>         return func
>     return decorator

The decorators are applied in order. So you first add the yet 
undecorated function as an attribute of the class, then pass the 
function to classmethod.

FWIW, this monkeypatch decorator is IMHO a plain waste of time. The 
following code does the same thing and is (IMHO again) *much* more readable:

def get_pocet_neocislovanych(cls, subjekt):
      return cls.objects.filter(
         subjekt=subjekt,
         cislo__isnull= True
         ).count() # or pass, this line is not important

Dokument.get_pocet_neocislovanych=@classmethod(get_pocet_neocislovanych)

Also, Django's BestPractice(tm) is to define such "query" methods on the 
  model's manager, not as a classmethod of the model.

My 2 cents


From tibor.beck at hotmail.com  Wed Mar  3 07:11:30 2010
From: tibor.beck at hotmail.com (gentlestone)
Date: Wed, 3 Mar 2010 04:11:30 -0800 (PST)
Subject: monkey patching with @classmethod
References: <b4ecc2a9-0ef4-43fa-999d-fdfb23b2ee4f@c16g2000yqd.googlegroups.com>
Message-ID: <1a134530-386e-47e4-9c63-385f8014c838@q15g2000yqj.googlegroups.com>

On 3. Mar., 12:57 h., gentlestone <tibor.b... at hotmail.com> wrote:
> Hi, is there some well-known problems with class method monkey
> patching?
>
> I've got this error message:
>
> unbound method get_pocet_neocislovanych() must be called with Pozemok
> instance as first argument (got Subjekt instance instead)
>
> The method is declared as:
> @classmethod
> @monkeypatch(Dokument)
> def get_pocet_neocislovanych(cls, subjekt):
> ? ? return cls.objects.filter(subjekt = subjekt, cislo__isnull =
> True).count() # or pass, this line is not important
>
> and the monkey patch decorator is declared as:
> def monkeypatch(cls):
> ? ? def decorator(func):
> ? ? ? ? setattr(cls, func.__name__, func)
> ? ? ? ? return func
> ? ? return decorator
>
> If I move the method to class declaration (whitout monkey patching),
> everything is ok, but only if I've restarted the server.

for complexity, there is a code I call the method:

def _application_menu(request, subjekt, aplikacia_url_name):
    return render_to_response('subjekty/aplikacia.html', {
        'subjekt' : subjekt,
        'aplikacia_url_name' : aplikacia_url_name,
        'aplikacia_dictionary' :
aplikacia_dictionary(aplikacia_url_name),
        'listy' : [
            (dokument_url_name, dict(
                get_verbose_name_plural =
dokument.get_verbose_name_plural(),
                get_pocet_neocislovanych =
dokument.get_pocet_neocislovanych(subjekt),
                get_pocet_celkom = dokument.get_pocet_celkom(subjekt),
            )) for dokument_url_name, dokument in
aplikacia_dictionary(aplikacia_url_name)['listy']
        ],
    }, context_instance = RequestContext(request))


unfortunately, sometimes it works, sometimes not, I cannot imagine the
reason, why and when it works and not - even whitout monkey patching

seems like some black magic


From albert at spenarnc.xs4all.nl  Wed Mar  3 07:43:34 2010
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 03 Mar 2010 12:43:34 GMT
Subject: Which mock library do you prefer?
References: <f3baba98-a0fc-4c6a-9fff-661da8356bc0@h2g2000yqj.googlegroups.com>
	<485b80f9-96c7-4946-8f38-44eb7d81fe1d@z19g2000yqk.googlegroups.com>
	<87sk90c499.fsf@benfinney.id.au>
	<e88f4781-4b1f-4a9d-8c61-3a13c854c280@d27g2000yqn.googlegroups.com>
Message-ID: <kypi0m.i9s@spenarnc.xs4all.nl>

In article <e88f4781-4b1f-4a9d-8c61-3a13c854c280 at d27g2000yqn.googlegroups.com>,
Lacrima  <lacrima.maxim at gmail.com> wrote:
>On Feb 16, 10:30=A0pm, Ben Finney <ben+pyt... at benfinney.id.au> wrote:
>> Lacrima <lacrima.ma... at gmail.com> writes:
>> > And I have already refused to write totally isolated tests, because it
>> > looks like a great waste of time.
>>
>> It only looks like that until you chase your tail in a long, fruitless
>> debugging session because (you later realise) the behaviour of one test
>> is being affected by another. Test isolation is essential to ensure that
>> your tests are doing what you think they're doing.
>>
>> --
>> =A0\ =A0 =A0 =A0 =93A =91No=92 uttered from deepest conviction is better =
>and greater |
>> =A0 `\ =A0 =A0 =A0 than a =91Yes=92 merely uttered to please, or what is =
>worse, to |
>> _o__) =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0avoid tr=
>ouble.=94 =97Mohandas K. Gandhi |
>> Ben Finney
>
>Hi!
>
>Right, isolation is essential. But I can't decide to which extent I
>should propagate isolation.
>For example, in "Python Testing: Beginner's Guide" by Daniel Arbuckle,
>author suggests that if you do unittesting you should isolate the
>smallest units of code from each other. For example, if you have a
>class:
>Class SomeClass(object):
>    def method1(self):
>        return 5
>    def method2(self):
>        return self.method1 + 10
>
>According to the book, if you want to test method2, you should isolate
>it from method1 and class instance('self').
>Other books are not so strict...
>
>And what should I follow as newbie?
>
>Currently, I don't create mocks of units if they are within the same
>class with the unit under test. If that is not right approach, please,
>explain what are best practices... I am just learning TDD..

Unit testing is a concept that goes well with functions without
side effects. If you have classes, that doesn't work so well.

For classes use cases are the way to go.
Think about it. The whole state of an object can affect the
way a method works. So effectively for a unit test you have
to put the object in a whole special fully controlled state.
The point of an object is that it can't have just any state, but only
those attained by calling methods properly. So you may find yourself
artificially imposing states on an object with great effort, and
expecting error detection where the errors cannot in fact occur etc.
etc.

Not that coming up with good use cases is easy, but at least
they are naturally related to your objects.

>
>with regards,
>Maxim

Groetjes Albert

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- being exponential -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From olof.bjarnason at gmail.com  Wed Mar  3 07:45:28 2010
From: olof.bjarnason at gmail.com (Olof Bjarnason)
Date: Wed, 3 Mar 2010 13:45:28 +0100
Subject: Working group for Python CPAN-equivalence?
Message-ID: <c3dfe1d1003030445w29fd54b1t806fa8a75be978db@mail.gmail.com>

Hi everybody!

The "Where is CPAN for Python?" question keeps popping up, with
answers ranging from "There is no CPAN for Python" and "We already
have CPAN for Python" (confusing).

I'm wondering - is there any work being done identifying ..

(1) what is so good with CPAN?
(2) how can it be brought to the Python world?

Is there a working group/initiative for this? Web page? Discussion group?


/Olof


From stefan_ml at behnel.de  Wed Mar  3 07:52:07 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 03 Mar 2010 13:52:07 +0100
Subject: Working group for Python CPAN-equivalence?
In-Reply-To: <c3dfe1d1003030445w29fd54b1t806fa8a75be978db@mail.gmail.com>
References: <c3dfe1d1003030445w29fd54b1t806fa8a75be978db@mail.gmail.com>
Message-ID: <hmlm1n$eqm$1@dough.gmane.org>

Olof Bjarnason, 03.03.2010 13:45:
> The "Where is CPAN for Python?" question keeps popping up, with
> answers ranging from "There is no CPAN for Python" and "We already
> have CPAN for Python" (confusing).

It confuses me that you call this "confusing".


> I'm wondering - is there any work being done identifying ..
>
> (1) what is so good with CPAN?
> (2) how can it be brought to the Python world?
>
> Is there a working group/initiative for this? Web page? Discussion group?

I think the right place to discuss any deficiencies of PyPI compared to 
CPAN is the distutils-sig mailing list.

Stefan



From python.list at tim.thechases.com  Wed Mar  3 07:55:54 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 03 Mar 2010 06:55:54 -0600
Subject: Interest check in some delicious syntactic sugar for "except:pass"
In-Reply-To: <35e00b331003030127y11b4964ev8c71417a2599eeec@mail.gmail.com>
References: <35e00b331003030127y11b4964ev8c71417a2599eeec@mail.gmail.com>
Message-ID: <4B8E5C5A.9020407@tim.thechases.com>

Oren Elrad wrote:
> I'm wondering if there is any support (tepid better than none) for the
> following syntactic sugar:
> 
> silence:
> ........ block
> 
> ------------------------->
> 
> try:
> ........block
> except:
> ........pass

The general response to "except: pass" from the Old Ones on the 
python list (and those younger ones who tend to prescribe good 
style) is a fairly immediate "don't use bare excepts".  So 
endorsing this "silence" syntax would be tantamount to condoning 
bare excepts.  I'm not sure you'll find much support.

http://www.google.com/search?q=site%3Amail.python.org+%22bare+excepts%22

(I've had problems with Google finding all posts to c.l.p on 
m.p.o recently, so this may only be a recent representative sample)

-tkc





From stefan_ml at behnel.de  Wed Mar  3 07:56:19 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 03 Mar 2010 13:56:19 +0100
Subject: Working group for Python CPAN-equivalence?
In-Reply-To: <hmlm1n$eqm$1@dough.gmane.org>
References: <c3dfe1d1003030445w29fd54b1t806fa8a75be978db@mail.gmail.com>
	<hmlm1n$eqm$1@dough.gmane.org>
Message-ID: <hmlm9k$eqm$2@dough.gmane.org>

Stefan Behnel, 03.03.2010 13:52:
> Olof Bjarnason, 03.03.2010 13:45:
>> The "Where is CPAN for Python?" question keeps popping up, with
>> answers ranging from "There is no CPAN for Python" and "We already
>> have CPAN for Python" (confusing).
>
> It confuses me that you call this "confusing".
>
>
>> I'm wondering - is there any work being done identifying ..
>>
>> (1) what is so good with CPAN?
>> (2) how can it be brought to the Python world?
>>
>> Is there a working group/initiative for this? Web page? Discussion group?
>
> I think the right place to discuss any deficiencies of PyPI compared to
> CPAN is the distutils-sig mailing list.

Ah, and the catalog-sig, if it's really related to the index rather than 
packages and package distribution.

Stefan



From olof.bjarnason at gmail.com  Wed Mar  3 07:59:00 2010
From: olof.bjarnason at gmail.com (Olof Bjarnason)
Date: Wed, 3 Mar 2010 13:59:00 +0100
Subject: Working group for Python CPAN-equivalence?
In-Reply-To: <hmlm1n$eqm$1@dough.gmane.org>
References: <c3dfe1d1003030445w29fd54b1t806fa8a75be978db@mail.gmail.com>
	<hmlm1n$eqm$1@dough.gmane.org>
Message-ID: <c3dfe1d1003030459o71a48da4hbc2d5a4995bdbd91@mail.gmail.com>

2010/3/3 Stefan Behnel <stefan_ml at behnel.de>:
> Olof Bjarnason, 03.03.2010 13:45:
>>
>> The "Where is CPAN for Python?" question keeps popping up, with
>> answers ranging from "There is no CPAN for Python" and "We already
>> have CPAN for Python" (confusing).
>
> It confuses me that you call this "confusing".

How come?

>
>
>> I'm wondering - is there any work being done identifying ..
>>
>> (1) what is so good with CPAN?
>> (2) how can it be brought to the Python world?
>>
>> Is there a working group/initiative for this? Web page? Discussion group?
>
> I think the right place to discuss any deficiencies of PyPI compared to CPAN
> is the distutils-sig mailing list.

Thanks.

>
> Stefan
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
http://olofb.wordpress.com


From ben+python at benfinney.id.au  Wed Mar  3 08:08:20 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 04 Mar 2010 00:08:20 +1100
Subject: Which mock library do you prefer?
References: <f3baba98-a0fc-4c6a-9fff-661da8356bc0@h2g2000yqj.googlegroups.com>
	<485b80f9-96c7-4946-8f38-44eb7d81fe1d@z19g2000yqk.googlegroups.com>
	<87sk90c499.fsf@benfinney.id.au>
	<e88f4781-4b1f-4a9d-8c61-3a13c854c280@d27g2000yqn.googlegroups.com>
	<kypi0m.i9s@spenarnc.xs4all.nl>
Message-ID: <87wrxtv9h7.fsf@benfinney.id.au>

Albert van der Horst <albert at spenarnc.xs4all.nl> writes:

> Unit testing is a concept that goes well with functions without side
> effects. If you have classes, that doesn't work so well.

How so? Unit tests are ideal for testing classes, in my experience; they
can be inspected and tested as a distinct unit of code.

> For classes use cases are the way to go.

That's a category error. Use cases are good for *functional* testing;
that is, testing of the system as a whole, with the focus on specific
uses to which the system needs to be put.

They're quite orthogonal. Neither interferes with the other. It's best
to have both.

> Think about it. The whole state of an object can affect the way a
> method works. So effectively for a unit test you have to put the
> object in a whole special fully controlled state.

That's right. This is called a ?test fixture?, and it's a central
concept of unit testing. There is explicit support in xUnit-style unit
test libraries (like Python's ?unittest?) for test fixtures.

-- 
 \     ?When I was a kid I used to pray every night for a new bicycle. |
  `\    Then I realised that the Lord doesn't work that way so I stole |
_o__)                   one and asked Him to forgive me.? ?Emo Philips |
Ben Finney


From lie.1296 at gmail.com  Wed Mar  3 08:09:20 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Thu, 04 Mar 2010 00:09:20 +1100
Subject: Docstrings considered too complicated
In-Reply-To: <pan.2010.03.03.05.48.49@REMOVE.THIS.cybersource.com.au>
References: <20100224212303.242222c6@geekmail.INVALID>	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>	<20100227191040.6c77f2d8@geekmail.INVALID>	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>	<20100301182255.3de59bc6@geekmail.INVALID>	<mailman.66.1267465347.23598.python-list@python.org>	<20100301212954.7aa0b99d@geekmail.INVALID>
	<87eik3zmi8.fsf@benfinney.id.au>	<20100302184056.743a71e7@geekmail.INVALID>	<mailman.129.1267553139.23598.python-list@python.org>	<20100302225156.67171851@geekmail.INVALID>
	<877hpuxpdf.fsf@benfinney.id.au>	<7v6ae4Ff37U1@mid.individual.net>
	<pan.2010.03.03.05.48.49@REMOVE.THIS.cybersource.com.au>
Message-ID: <4b8e5f9f$1@dnews.tpgi.com.au>

On 03/03/2010 04:48 PM, Steven D'Aprano wrote:
> Or one can simply use *reason*: what justification is there for putting 
> comments in strings at the top of the function? The only one I can see is 
> if you are writing for an embedded device, you may want to remove doc 
> strings to save memory -- and even that is implementation dependent.

Python already have a well-defined mechanism to remove docstrings with
the -O flag; there is really no other reason but plain ignorance and
inflexibility to think in other language than
<insert-your-first-language-here>.


From lie.1296 at gmail.com  Wed Mar  3 08:19:56 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Thu, 04 Mar 2010 00:19:56 +1100
Subject: There should be one-- and preferably only one --obvious way to
	do it (was "Interest check in some delicious syntactic sugar for
	"except:pass"")
In-Reply-To: <mailman.170.1267608442.23598.python-list@python.org>
References: <mailman.170.1267608442.23598.python-list@python.org>
Message-ID: <4b8e621b@dnews.tpgi.com.au>

On 03/03/2010 08:27 PM, Oren Elrad wrote:
> Howdy all, longtime appreciative user, first time mailer-inner.
> 
> I'm wondering if there is any support (tepid better than none) for the
> following syntactic sugar:
> 
> silence:
> ......... block
> 
> ------------------------->
> 
> try:
> .........block
> except:
> .........pass
> 
> The logic here is that there are a ton of "except: pass" statements[1]
> floating around in code that do not need to be there. Meanwhile, the
> potential keyword 'silence' does not appear to be in significant use
> as a variable[2], or an alternative keyword might be imagined
> ('quiet', 'hush', 'stfu') but I somewhat like the verbiness of
> 'silence' since that is precisely what it does to the block (that is,
> you have to inflect it as a verb, not a noun -- you are telling the
> block to be silent). Finally, since this is the purest form of
> syntactic sugar, I cannot fathom any parsing, interpreting or other
> complications that would arise.

Given that python HATE bare-except (and `pass`-block bare except is even
worse) and given python's idiosyncrasies "There should be one-- and
preferably only one --obvious way to do it", "Errors should never pass
silently"; the chance for `silence` keyword is precisely zero.

> I appreciate any feedback, including frank statements that you'd
> rather not trifle with such nonsense.

There are lots of reason why bare-except is bad, one being is that it
makes it way too easy to ignore errors that you don't actually want to
silence; and given that bare-excepts would prevent Ctrl+C (Interrupt)
from working. Sorry, but IMHO we shouldn't make syntax sugar for bad
practices.


From ben+python at benfinney.id.au  Wed Mar  3 08:21:14 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 04 Mar 2010 00:21:14 +1100
Subject: Working group for Python CPAN-equivalence?
References: <mailman.179.1267620332.23598.python-list@python.org>
Message-ID: <87r5o1v8vp.fsf@benfinney.id.au>

Olof Bjarnason <olof.bjarnason at gmail.com> writes:

> Hi everybody!
>
> The "Where is CPAN for Python?" question keeps popping up, with
> answers ranging from "There is no CPAN for Python" and "We already
> have CPAN for Python" (confusing).

Caused in no small measure by the fact that Perl people mean at least
two distinct things by ?Where is CPAN for Python??:

* The central package registry, CPAN, with metadata in a standard
  queryable format, and all registered packages redundantly mirrored and
  available for installation at user-specified versions.

  We have an equivalent in PyPI, though it's incomplete since many
  *registered* packages are not actually hosted *at* PyPI.

* The command-line tool, ?cpan?, used for performing operations on the
  set of locally-installed Perl packages, and for package maintainers
  performing operations on the repository.

  We have nothing like this. The Distutils library does a small part of
  the job, and the third-party ?easy_install? program works for those
  which use the Setuptools extensions; but there's nothing at all
  equivalent to Perl's ?cpan? tool.

Often, Perl people asking simply ?Where is CPAN for Python?? are asking
about a third thing:

* The unified, mature, actively-maintained, seamless combination of the
  CPAN repository and the ?cpan? tool, that work together as a single
  reliable system to such an extent that one can sensibly talk about
  them *both* as one thing, ?CPAN?.

  This one we're a *long* way from with Python, IMO. Much work has been
  going on over the last year or so, and it's encouraging to see; but so
  much of that work is dealing with the legacy burden of Distutils that
  I get weary seeing how far there is to go.

-- 
 \         ?A child of five could understand this. Fetch me a child of |
  `\                                              five.? ?Groucho Marx |
_o__)                                                                  |
Ben Finney


From zhushazang at yahoo.com.br  Wed Mar  3 08:32:30 2010
From: zhushazang at yahoo.com.br (Zhu Sha Zang)
Date: Wed, 03 Mar 2010 10:32:30 -0300
Subject: Eric4 vs Python3.1
Message-ID: <4B8E64EE.9040707@yahoo.com.br>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Someone using Eric4 to program with Python3/3.1?

What can i do, because he insist to use only Python2.6.4.

Att
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.14 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/

iEYEARECAAYFAkuOZO4ACgkQ35zeJy7JhCjdFACfZrjVa+8O9fu/7FEPr6mVeaEg
Rm0AmgM+XtuxFH1zUnfkaphF+MgPy3pf
=MVeJ
-----END PGP SIGNATURE-----


From tibor.beck at hotmail.com  Wed Mar  3 08:45:27 2010
From: tibor.beck at hotmail.com (gentlestone)
Date: Wed, 3 Mar 2010 05:45:27 -0800 (PST)
Subject: monkey patching with @classmethod
References: <b4ecc2a9-0ef4-43fa-999d-fdfb23b2ee4f@c16g2000yqd.googlegroups.com>
	<4b8e5161$0$23009$426a74cc@news.free.fr>
Message-ID: <0b3928bb-04e6-402a-9842-680b621ae256@x22g2000yqx.googlegroups.com>

On 3. Mar., 13:09 h., Bruno Desthuilliers <bruno.
42.desthuilli... at websiteburo.invalid> wrote:
> gentlestone a ?crit :
>
>
>
> > Hi, is there some well-known problems with class method monkey
> > patching?
>
> > I've got this error message:
>
> > unbound method get_pocet_neocislovanych() must be called with Pozemok
> > instance as first argument (got Subjekt instance instead)
> > The method is declared as:
> > @classmethod
> > @monkeypatch(Dokument)
> > def get_pocet_neocislovanych(cls, subjekt):
> > ? ? return cls.objects.filter(subjekt = subjekt, cislo__isnull =
> > True).count() # or pass, this line is not important
>
> > and the monkey patch decorator is declared as:
> > def monkeypatch(cls):
> > ? ? def decorator(func):
> > ? ? ? ? setattr(cls, func.__name__, func)
> > ? ? ? ? return func
> > ? ? return decorator
>
> The decorators are applied in order. So you first add the yet
> undecorated function as an attribute of the class, then pass the
> function to classmethod.
>
> FWIW, this monkeypatch decorator is IMHO a plain waste of time. The
> following code does the same thing and is (IMHO again) *much* more readable:
>
> def get_pocet_neocislovanych(cls, subjekt):
> ? ? ? return cls.objects.filter(
> ? ? ? ? ?subjekt=subjekt,
> ? ? ? ? ?cislo__isnull= True
> ? ? ? ? ?).count() # or pass, this line is not important
>
> Dokument.get_pocet_neocislovanych=@classmethod(get_pocet_neocislovanych)
>
> Also, Django's BestPractice(tm) is to define such "query" methods on the
> ? model's manager, not as a classmethod of the model.
>
> My 2 cents

thx, I changed my definitions to manager style and have no more
problems

seems to be safe to use manager instead classmethod - do not know
why :-)


From benjamin.kaplan at case.edu  Wed Mar  3 08:48:37 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 3 Mar 2010 08:48:37 -0500
Subject: Re Interest check in some delicious syntactic sugar for 
	"except:pass"
In-Reply-To: <35e00b331003030347x30f3f2faua96a9b72814743da@mail.gmail.com>
References: <35e00b331003030347x30f3f2faua96a9b72814743da@mail.gmail.com>
Message-ID: <ec96e1391003030548w3eb2544auc795a5d44a803720@mail.gmail.com>

On Wed, Mar 3, 2010 at 6:47 AM, Oren Elrad <orenelrad at gmail.com> wrote:

> To all that responded, thanks for the prompt response folks, your
> criticisms are well taken. Coming from Cland, one is inculcated with
> the notion that if the programmer wants to shoot himself in the foot
> the language ought not to prevent that (or even should return him a
> loaded magnum with the safety off and the hair-trigger pulled). My
> apologies for not immediately grokking the cultural difference in
> pytown.
>
> With that said, let me at least offer a token defense of my position.
> By way of motivation, I wrote that email after copying/pasting the
> following a few times around a project until I wrote it into def
> SilentlyDelete() and its cousin SilentlyRmdir()
>
> """ code involving somefile """
> try:
> ........os.remove(somefile)
> except:
> .......pass     # The bloody search indexer has got the file and I
> can't delete it. Nothing to be done.
>
> Certainly the parade of horribles (bad files! corrupt data! syntax
> errors!) is a tad melodramatic. Either os.remove() succeeds or it
> doesn't and the execution path (in the estimation of this programmer,
> at least) is not at all impacted by whether it succeeds or fails. I
> know with certainty at compile time what exceptions might be raised
> and what the consequences of passing them are and there is no sense
> pestering the user or sweating over it. Nor can I see the logic, as
> was suggested, in writing "except OSError:" since (seems to me) mere
> surplusage -- it neither causes a semantic difference in the way the
> program runs nor provides anything useful to the reader.
>
>
What if the user presses Ctrl-C to try to quit the program? Your bare except
is catching the KeyboardInterrupts and ignoring them.
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From desktopsbyduck at gmail.com  Wed Mar  3 08:49:34 2010
From: desktopsbyduck at gmail.com (RICHARD MOORE)
Date: Wed, 3 Mar 2010 05:49:34 -0800 (PST)
Subject: RICHARD MOORE wants to stay in touch on LinkedIn
Message-ID: <1313196773.7301341.1267624174377.JavaMail.app@ech3-cdn11.prod>

LinkedIn
------------
   
I'd like to add you to my professional network on LinkedIn.

- RICHARD MOORE

Confirm that you know RICHARD MOORE
https://www.linkedin.com/e/isd/1117171902/jlHq1JKw/EML-invg_56/


 
------
(c) 2010, LinkedIn Corporation
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From desktopsbyduck at gmail.com  Wed Mar  3 08:50:07 2010
From: desktopsbyduck at gmail.com (RICHARD MOORE)
Date: Wed, 3 Mar 2010 05:50:07 -0800 (PST)
Subject: RICHARD MOORE wants to stay in touch on LinkedIn
Message-ID: <1916304926.7302790.1267624207959.JavaMail.app@ech3-cdn11.prod>

LinkedIn
------------
   
I'd like to add you to my professional network on LinkedIn.

- RICHARD MOORE

Confirm that you know RICHARD MOORE
https://www.linkedin.com/e/isd/1117171902/jlHq1JKw/EML-invg_56/


 
------
(c) 2010, LinkedIn Corporation
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From yyfgv at yahoo.com.ar  Wed Mar  3 09:00:16 2010
From: yyfgv at yahoo.com.ar (Publicidad para Todos)
Date: 03 Mar 2010 11:00:16 -0300
Subject: Tu mailing llega ahora a todos lados
Message-ID: <20100303105936.0C607419FF28A41A@yahoo.com.ar>

An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20100303/ecb62e34/attachment.html>

From fetchinson at googlemail.com  Wed Mar  3 09:33:30 2010
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Wed, 3 Mar 2010 15:33:30 +0100
Subject: Re Interest check in some delicious syntactic sugar for 
	"except:pass"
In-Reply-To: <35e00b331003030347x30f3f2faua96a9b72814743da@mail.gmail.com>
References: <35e00b331003030347x30f3f2faua96a9b72814743da@mail.gmail.com>
Message-ID: <fbe2e2101003030633j63fccf4n1274d7f8d2691ac1@mail.gmail.com>

> By way of motivation, I wrote that email after copying/pasting the
> following a few times around a project until I wrote it into def
> SilentlyDelete() and its cousin SilentlyRmdir()
>
> """ code involving somefile """
> try:
> ........os.remove(somefile)
> except:
> .......pass     # The bloody search indexer has got the file and I
> can't delete it. Nothing to be done.

You just found the right solution: define a function for something
that you do repeatedly. No need to change the language.

Cheers,
Daniel



-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From subhakolkata1234 at gmail.com  Wed Mar  3 09:36:23 2010
From: subhakolkata1234 at gmail.com (joy99)
Date: Wed, 3 Mar 2010 06:36:23 -0800 (PST)
Subject: Few early questions on Class
Message-ID: <24aeb097-6376-46b8-a3ff-df4a04d49a3c@y7g2000prc.googlegroups.com>

Dear Group,

I was practising some early example of class if you can kindly let me
know where I was going wrong.

I am pasting directly from IDLE. There may be slight indentation
problem. I am using Python 2.6.4 on Windows XP Service Pack 3.

The Code and the output:

>>> class Student:
	def _init_(self,name):
		self.name=name
		self.attendance=0
		self.marks=[]
		number_of_marks=len(self.marks)
		print number_of_marks


>>> b=Student("Bobby")

Traceback (most recent call last):
  File "<pyshell#9>", line 1, in <module>
    b=Student("Bobby")
TypeError: this constructor takes no arguments
>>> Class Shape:

SyntaxError: invalid syntax
>>> class Shape:
	def _init_(self,x,y):
		self.x=x
		self.y=y
		description="This Shape is not been described Yet"
		author="Nobody has Claimed it Yet"
		def area(self):
			return self*x+self*y
		def perimeter(self):
			return 2*self.x+2*self*y


>>> rectangle=Shape(100,45)

Traceback (most recent call last):
  File "<pyshell#22>", line 1, in <module>
    rectangle=Shape(100,45)
TypeError: this constructor takes no arguments
>>> rectangle=Shape()
>>> print rectangle.area()

Traceback (most recent call last):
  File "<pyshell#24>", line 1, in <module>
    print rectangle.area()
AttributeError: Shape instance has no attribute 'area'
>>>
Best Regards,
Subhabrata.


From pranav.choudhary at gmail.com  Wed Mar  3 09:41:25 2010
From: pranav.choudhary at gmail.com (pranav)
Date: Wed, 3 Mar 2010 06:41:25 -0800 (PST)
Subject: save CRL to a file (M2Crypto.X509.CRL object)
Message-ID: <c81406ec-9560-4c9f-8dd5-0a3c895ae771@k36g2000prb.googlegroups.com>

I do not see an option to save M2Crypto.X509.CRL object to a file. Am
I overlooking something?

Thanks


From python at mrabarnett.plus.com  Wed Mar  3 09:42:00 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 03 Mar 2010 14:42:00 +0000
Subject: Docstrings considered too complicated
In-Reply-To: <7v695nFa0fU1@mid.individual.net>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>	<4B8B9845.70604@sequans.com>	<mailman.59.1267456634.23598.python-list@python.org>
	<7v695nFa0fU1@mid.individual.net>
Message-ID: <4B8E7538.2080003@mrabarnett.plus.com>

Gregory Ewing wrote:
> MRAB wrote:
> 
>> BTW, the first programming I did was in hexadecimal (C4xx was "LDI xx").
> 
> Hey, a SC/MP! That was my first programming language,
> too. What sort of machine was it in?
> 
Mk14 from Science of Cambridge, a kit with hex keypad and 7-segment
display, which I had to solder together, and also make my own power
supply. I had the extra RAM and the I/O chip, so that's 256B (including
the memory used by the monitor) + 256B additional RAM + 128B more in the
I/O chip.


From jmg3000 at gmail.com  Wed Mar  3 09:42:24 2010
From: jmg3000 at gmail.com (John Gabriele)
Date: Wed, 3 Mar 2010 06:42:24 -0800 (PST)
Subject: Few early questions on Class
References: <24aeb097-6376-46b8-a3ff-df4a04d49a3c@y7g2000prc.googlegroups.com>
Message-ID: <7277b1d5-e1b5-4afc-a9a4-9e45e9e4ff80@z11g2000yqz.googlegroups.com>

Hi Subhabrata,

s/_init_/__init__/


From python at mrabarnett.plus.com  Wed Mar  3 09:45:06 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 03 Mar 2010 14:45:06 +0000
Subject: case do problem
In-Reply-To: <7v6cviFq18U1@mid.individual.net>
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>	<hmjjnn$arj$1@news.eternal-september.org>
	<7v6cviFq18U1@mid.individual.net>
Message-ID: <4B8E75F2.8090608@mrabarnett.plus.com>

Gregory Ewing wrote:
> Alf P. Steinbach wrote:
>> * Tracubik:
>  >
>>> iterations=0;
>>> count=0;
>>> REPEAT;
>>>   iterations = iterations+1;
>>>   ...
>>>   IF (genericCondition) THEN count=count+1;
>>>   ...
>>>   CASE count OF:
>>>     1: m = 1
>>>         2: m = 10
>>>         3: m = 100
>>
>> Uhm, is this syntactically valid Pascal? As I recall, every Pascal 
>> construct was delimited in some way.
> 
> I think it's okay. Pascal's control structures such as
> if-then and while-do mostly take single statements and
> didn't have an ending keyword. If you want multiple
> statements in the body you have to put begin-end around
> them.
> 
> Putting a semicolon after REPEAT is stylistically a
> bit odd, but it's not wrong.
> 
There shouldn't be a colon after the 'OF', and the cases themselves
should be separated by semicolons (the case-statement itself ends with
'end').


From python.list at tim.thechases.com  Wed Mar  3 09:49:27 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 03 Mar 2010 08:49:27 -0600
Subject: Re Interest check in some delicious syntactic sugar for
	"except:pass"
In-Reply-To: <35e00b331003030347x30f3f2faua96a9b72814743da@mail.gmail.com>
References: <35e00b331003030347x30f3f2faua96a9b72814743da@mail.gmail.com>
Message-ID: <4B8E76F7.20809@tim.thechases.com>

Oren Elrad wrote:
> """ code involving somefile """
> try:
> ........os.remove(somefile)
> except:
> .......pass     # The bloody search indexer has got the file and I
> can't delete it. Nothing to be done.


I admit there are times I've done something similar, usually with 
what I call my "int0" and "float0" utility functions which 
roughly translate to "give me a stinkin' int/float and if 
something goes wrong, give me 0, but the return result better 
darn well be an int/float!" functions.  But as you describe and 
was later commended as a right-ish way to approach it, 
abstracting that off into a function with minimal code in the 
try: block is the right way to go.

-tkc


def int0(v):
   """converts v to a int, or returns 0 if it can't"""
   try:
     return int(v)
   except: # usually a ValueError but catch all cases
     try:
       # int("1.1") fails so try float()ing it first
       return int(round(float(v)))
     except:
       return 0

def float0(v):
   """converts v to a float, or returns 0 if it can't"""
   try:
     return float(v)
   except:
     return 0.0






From electriclightheads at gmail.com  Wed Mar  3 09:50:09 2010
From: electriclightheads at gmail.com ('2+)
Date: Wed, 3 Mar 2010 23:50:09 +0900
Subject: pyao makes the right sound but why?
Message-ID: <1078018b1003030650g499e4a7bvfaab763be485755c@mail.gmail.com>

with my soy.py

tofu = soy.Bean()
x = tofu.pattern(44100 * 3)

creates x which is an array('h') and len(x) = 44100 * 6
this x is a stereo groove pattern that lasts 3 sec if samplerate is set to 44100
and since wave.py could save it to a_file.wav
i was wondering if

dev = ao.AudioDevice('alsa')
dev.play(x)

could launch me a semi realtime dj kinda sys
luckily .. it does seem to be making the right sound
but why?
the default of the samplerate and that 16bit happened to match with my thing x?
o but if i do

dev.play(x, len(x))

it only plays the half of the pattern
and

dev.play(x, 2 * len(x))

does the right thing

and the 2nd 4th 6th .. play gives me

ALSA underrun, at least 0ms

3rd, 5th, 7th does it fine

/usr/share/doc/python-pyao
doesn't teach me the answer
does somebody know more about pyao?

-- 
SaRiGaMa's Oil Vending Orchestra
is podcasting:
http://sarigama.namaste.jp/podcast/rss.xml


From spamfresser at ch3ka.de  Wed Mar  3 09:50:19 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Wed, 03 Mar 2010 15:50:19 +0100
Subject: Re Interest check in some delicious syntactic sugar for
	"except:pass"
In-Reply-To: <mailman.178.1267616851.23598.python-list@python.org>
References: <mailman.178.1267616851.23598.python-list@python.org>
Message-ID: <hmlsvf$mrn$1@news.urz.uni-heidelberg.de>

Am 03.03.2010 12:47, schrieb Oren Elrad:
> """ code involving somefile """
> try:
> ........os.remove(somefile)
> except:
> .......pass     # The bloody search indexer has got the file and I
> can't delete it. Nothing to be done.

You don't know that what you stated in your comment is true.
All you know is that there was an exception. To find the reason, you 
have to inspect the exception.
You escpecially do NOT know whether the file is removed or not.

OK, os.remove() might be a CPython builtin (not sure ATM), but in 
general all sort of crazy things can happen here, like ImportError 
raised by code in the lib or so.
And of course: a bare except: also catches ^C or SystemExit. That is 
almost certainly *not* what you want, right?

To your first question about a "silenced" keyword: you could emulate 
this with context managers I guess.

Something like (untested, just a quick mockup how it could look):



class silenced:
	def __init__(self, *silenced):
		self.exceptions=tuple(silenced) #just to be explicit
	def __enter__(self):
		return self			#dito1
	def __exit__(self, type, value, traceback):
		for ex in self.exceptions:
			if isinstance(value, ex):
				return True #supresses exception


So:

with silenced(os.Error):
	os.remove(somefile)

Would translate to:

try:
	os.remove(somefile)
except os.Error:
	pass

One nice thing about this approach would be that you can alias a set of 
exceptions with this:

idontcareabouttheseerrors=silenced(TypeError, ValueError, PEBCAKError, 
SyntaxError, EndOfWorldError, 1D10T_Error)

with idontcareabouttheseerrors:
	do_stuff()

Regards,
Michael


From michaelveloz at gmail.com  Wed Mar  3 09:57:56 2010
From: michaelveloz at gmail.com (Veloz)
Date: Wed, 3 Mar 2010 06:57:56 -0800 (PST)
Subject: Queue peek?
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>
	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com> 
	<58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com> 
	<mailman.138.1267559095.23598.python-list@python.org>
	<hmjqkr$r46$1@news.eternal-september.org> 
	<eae285401003021233i7a62771h590a557341f10ca4@mail.gmail.com> 
	<hmk1er$mlb$1@dough.gmane.org>
	<1267567723.4101.28.camel@localhost.localdomain> 
	<mailman.156.1267578012.23598.python-list@python.org>
	<7v6cf4FnnrU1@mid.individual.net>
Message-ID: <8bbd0a04-9a13-4f36-91c7-80f07bee0952@y17g2000yqd.googlegroups.com>

On Mar 3, 1:14?am, Gregory Ewing <greg.ew... at canterbury.ac.nz> wrote:
> MRAB wrote:
> > I suppose it depends on the complexity of the data structure. A dict's
> > methods are threadsafe, for example, but if you have a data structure
> > where access leads to multiple method calls then collectively they need
> > a lock.
>
> It also depends on the nature of the objects being used
> as dict keys. Dict operations invoke the hashing and
> comparison methods of the keys, which in general can
> execute arbitrary Python code.
>
> If the keys are elementary built-in types such as
> strings or ints, then dict operations will *probably*
> be atomic. But I think I'd use a lock anyway, to be
> on the safe side.
>
> --
> Greg

Unless I missed where you guys were going, I think we got off the main
point. The main question at hand was this: what's the best way (heck,
any way) to implement a sort of "peek" whereby a number of processes
can write results to some common "object" and some other process can
"peek" into this object, looking for specific items they're interested
in?

I've tried doing this with a queue, as follows: children all write
results to queue, each result has an identifier.  Another interested
party, which wants to know if identifier XXX has been placed in the
queue, removes all the items, one by one from the queue, "keeps" the
one matching the identifier (if found) and puts the rest of the items
back on the queue, so other interested parties can also look through
it.

This is not a good solution, but it illustrates what I'm trying to
achieve..

I'm looking at multiprocessing.Manager, ctypes, etc, but nothing's
really jumped out.

I also tried creating my own list class which uses locks to provide a
"peek and remove" method, but I don't have a good way to share an
instance of this object across processes.

Any thoughts would be welcomed!
Michael


From jjposner at optimum.net  Wed Mar  3 09:58:46 2010
From: jjposner at optimum.net (John Posner)
Date: Wed, 03 Mar 2010 09:58:46 -0500
Subject: Method / Functions - What are the differences?
In-Reply-To: <4b8e4041$0$17447$426a34cc@news.free.fr>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>	<4b8c2a34$0$10470$426a74cc@news.free.fr>	<mailman.81.1267492052.23598.python-list@python.org>	<4b8cd310$0$4604$426a34cc@news.free.fr>	<mailman.109.1267539415.23598.python-list@python.org>	<hmk1mn$70u$1@newsreader3.netcologne.de>
	<4b8e4041$0$17447$426a34cc@news.free.fr>
Message-ID: <hmlte9$d0f$1@dough.gmane.org>

On 3/3/2010 5:56 AM, Bruno Desthuilliers wrote:
> Eike Welk a ?crit :
>> John Posner wrote:
>>> I've updated the text at this location:
>>>
>>> > http://cl1p.net/bruno_0301.rst/
>>
>> I think this is a very useful writeup!
>> It would be perfect with a little bit of introduction that says:
>> 1. - What it is: "The rough details of method look-up";
>> 2. - which contains some of the questions that that made that authors
>> write the text. This way people with similar questions can find it
>> with Google.
>>
>
> John, do you think you could something with the following ?

Sure thing, Bruno. I'll incorporate/edit your new text below into a 
Python Wiki entry. The headings in the Documentation table of contents 
page (http://wiki.python.org/moin/Documentation) seem pretty sober, so I 
plan to use a straightforward title:

   FromFunctionsToMethods

... instead of the clearly superior ...

   ItsAFunctionItsAMethodItsAUseOfTheDescriptorProtocol

Does this article belong in the "Advanced Topics" section of the page? 
I'm not sure, but I'll place it there for now. (Alternative suggestions 
welcome!)

>
> """
> "Is it a function ? is it a method ? No, it's... " - or : What's in a
> Python method ?
>
> Python newcomers often have hard time understanding the "magic" behind
> Python's methods - and truth is that Python's object model can be a bit
> peculiar when compared to most mainstream (or not-so-mainstream) OOPLs.
> As a matter of fact, there are quite a few threads on c.l.py with either
> direct or indirect questions about what makes a Python method, and I
> must have explained the whole mechanism at least 3 or 4 times there. The
> following text is an edited version of my last attempt, as edited,
> corrected and published by John Posner, MayHisNameBePraised(tm).
>
> This text isn't meant as a replacement for neither the official
> FineManual(tm)[XXX : relevant link] nor the very excellent - if somehow
> technical - 'Descriptors how-to' [XXX : relevant link]. It's mostly a
> brief but hopefully helpful overview of what exactly is a Python method,
> and how Python magically inserts the 'self' or 'cls' argument to method
> calls.
> """
>
> Feel free to edit / amend / rewrite / trash at will - you're now
> officially in charge of publishing this text !-)
>

Yow, the mantle of responsibility weighs heavily upon my poor shoulders!

Film at 11,
John



From jmg3000 at gmail.com  Wed Mar  3 10:04:08 2010
From: jmg3000 at gmail.com (John Gabriele)
Date: Wed, 3 Mar 2010 07:04:08 -0800 (PST)
Subject: Working group for Python CPAN-equivalence?
References: <mailman.179.1267620332.23598.python-list@python.org>
Message-ID: <67f0da3c-9c4d-4080-8821-3acbfada1d4f@o30g2000yqb.googlegroups.com>

On Mar 3, 7:45?am, Olof Bjarnason <olof.bjarna... at gmail.com> wrote:
> Hi everybody!
>
> The "Where is CPAN for Python?" question keeps popping up, with
> answers ranging from "There is no CPAN for Python" and "We already
> have CPAN for Python" (confusing).
>
> I'm wondering - is there any work being done identifying ..
>
> (1) what is so good with CPAN?
> (2) how can it be brought to the Python world?
>
> Is there a working group/initiative for this? Web page? Discussion group?

Hi Olof,

Discussions about that often take place on the distutils-sig and
catalog-sig MLs.

People are currently working on making the Cheeseshop even better and
the situation is improving. Have a look at [Tarek's blog](http://
tarekziade.wordpress.com/) for more info.

---John


From invalid at invalid.invalid  Wed Mar  3 10:05:54 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Wed, 3 Mar 2010 15:05:54 +0000 (UTC)
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <kyoevn.k63@spenarnc.xs4all.nl>
	<hmk60h$nce$1@reader1.panix.com> <7v69rcFcmeU1@mid.individual.net>
Message-ID: <hmltsi$jcd$1@reader1.panix.com>

On 2010-03-03, Gregory Ewing <greg.ewing at canterbury.ac.nz> wrote:
> Grant Edwards wrote:
>
>> Just a mediocre copy of the CP/M filesystem, which was in turn
>> copied from DEC's RSTS or RSX.
>
> It was actually an improvement over CP/M's file
> system. CP/M didn't have hierarchical directories

Neither did the original MS-DOS filesystem.

> or timestamps and recorded file sizes in 128-byte blocks
> rather than bytes.

I thought that was true of the original MS-DOS filesystem as
well, but I wouldn't bet money on it.

-- 
Grant Edwards               grant.b.edwards        Yow! I like the way ONLY
                                  at               their mouths move ...  They
                              gmail.com            look like DYING OYSTERS


From jmg3000 at gmail.com  Wed Mar  3 10:10:07 2010
From: jmg3000 at gmail.com (John Gabriele)
Date: Wed, 3 Mar 2010 07:10:07 -0800 (PST)
Subject: cpan for python?
References: <mailman.20.1267367545.23598.python-list@python.org> 
	<hmjv4b$mqk$1@reader1.panix.com>
	<2010030214473616807-tomfsessile@gmailcom> 
	<4b8ddea4$1@dnews.tpgi.com.au> <87ljea9f20.fsf@castleamber.com>
Message-ID: <45b1599f-a05b-4132-9e75-89a52757e71b@q21g2000yqm.googlegroups.com>

On Mar 2, 11:58?pm, John Bokma <j... at castleamber.com> wrote:
> Lie Ryan <lie.1... at gmail.com> writes:
> > On 03/03/2010 09:47 AM, TomF wrote:
>
> [..]
>
> >> There
> >> is also a program called cpan, distributed with Perl. ?It is used for
> >> searching, downloading, installing and testing modules from the CPAN
> >> repository. ?It's far more extensive than setuptools. ?AFAIK the python
> >> community has developed nothing like it.
>
> > python have easy_install
>
> How easy is it to /remove/ something? ;-) (Last time I checked I read
> something like "manually remove the .egg"...
>

Have a look at [pip](http://cheeseshop.python.org/pypi/pip). It should
support uninstalling packages.

---John


From alfps at start.no  Wed Mar  3 10:10:26 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 03 Mar 2010 16:10:26 +0100
Subject: A "scopeguard" for Python
Message-ID: <hmlu55$n1s$1@news.eternal-september.org>

For C++ Petru Marginean once invented the "scope guard" technique (elaborated on 
by Andrei Alexandrescu, they published an article about it in DDJ) where all you 
need to do to ensure some desired cleanup at the end of a scope, even when the 
scope is exited via an exception, is to declare a ScopeGuard w/desired action.

The C++ ScopeGuard was/is for those situations where you don't have proper 
classes with automatic cleanup, which happily is seldom the case in good C++ 
code, but languages like Java and Python don't support automatic cleanup and so 
the use case for something like ScopeGuard is ever present.

For use with a 'with' statement and possibly suitable 'lambda' arguments:


<code>
class Cleanup:
     def __init__( self ):
         self._actions = []

     def call( self, action ):
         assert( is_callable( action ) )
         self._actions.append( action )

     def __enter__( self ):
         return self

     def __exit__( self, x_type, x_value, x_traceback ):
         while( len( self._actions ) != 0 ):
             try:
                 self._actions.pop()()
             except BaseException as x:
                 raise AssertionError( "Cleanup: exception during cleanup" ) from
</code>


I guess the typical usage would be what I used it for, a case where the cleanup 
action (namely, changing back to an original directory) apparently didn't fit 
the standard library's support for 'with', like

   with Cleanup as at_cleanup:
       # blah blah
       chdir( somewhere )
       at_cleanup.call( lambda: chdir( original_dir ) )
       # blah blah

Another use case might be where one otherwise would get into very deep nesting 
of 'with' statements with every nested 'with' at the end, like a degenerate tree 
that for all purposes is a list. Then the above, or some variant, can help to 
/flatten/ the structure. To get rid of that silly & annoying nesting. :-)


Cheers,

- Alf (just sharing, it's not seriously tested code)


From spamfresser at ch3ka.de  Wed Mar  3 10:15:27 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Wed, 03 Mar 2010 16:15:27 +0100
Subject: Is this secure?
In-Reply-To: <4b8ddcf6$1@dnews.tpgi.com.au>
References: <mailman.110.1266935711.4577.python-list@python.org>	<7xtyt72200.fsf@ruckus.brouhaha.com>	<d8a401bf-6dfa-4e41-bea0-8cbf12f8d6e0@o3g2000vbo.googlegroups.com>	<7x3a0r8hyr.fsf@ruckus.brouhaha.com>	<mailman.169.1267032213.4577.python-list@python.org>	<hm3p7l$hr$1@news.urz.uni-heidelberg.de>	<hm3rgu$kvd$1@dough.gmane.org>	<hm3t1f$qbj$1@dough.gmane.org>
	<mailman.187.1267039205.4577.python-list@python.org>
	<4b8ddcf6$1@dnews.tpgi.com.au>
Message-ID: <hmluek$n0q$1@news.urz.uni-heidelberg.de>

Am 03.03.2010 04:51, schrieb Lie Ryan:
> import itertools
> def gen():
>      valid_chars = 'abcdefghijklmnopqrstuvwxyz'
>      for char in itertools.repeat(valid_chars):
>          yield char
>
> gen = gen()
> def gen_rand_string(length):
>      chars = (next(gen) for i in range(length))
>      return ''.join(chars)
>
> since it gives me a perfect distribution of letters,

It does not. Only if not (length(valid_chars) % length)

Regards,
Michael


From redazione at italiainweekend.it  Wed Mar  3 10:18:23 2010
From: redazione at italiainweekend.it (ItaliaWeekend)
Date: Wed, 3 Mar 2010 16:18:23 +0100
Subject: PAGINE DI UNA ITALIA MERAVIGLIOSA
Message-ID: <01f6f7b5$40240$efa56794340972@pavillon-pc>

An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20100303/5349480d/attachment.html>

From python at mrabarnett.plus.com  Wed Mar  3 10:19:56 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 03 Mar 2010 15:19:56 +0000
Subject: Interest check in some delicious syntactic sugar for "except:pass"
In-Reply-To: <35e00b331003030127y11b4964ev8c71417a2599eeec@mail.gmail.com>
References: <35e00b331003030127y11b4964ev8c71417a2599eeec@mail.gmail.com>
Message-ID: <4B8E7E1C.7090002@mrabarnett.plus.com>

Oren Elrad wrote:
> Howdy all, longtime appreciative user, first time mailer-inner.
> 
> I'm wondering if there is any support (tepid better than none) for the
> following syntactic sugar:
> 
> silence:
> ........ block
> 
> ------------------------->
> 
> try:
> ........block
> except:
> ........pass
> 
> The logic here is that there are a ton of "except: pass" statements[1]
> floating around in code that do not need to be there. Meanwhile, the
> potential keyword 'silence' does not appear to be in significant use
> as a variable[2], or an alternative keyword might be imagined
> ('quiet', 'hush', 'stfu') but I somewhat like the verbiness of
> 'silence' since that is precisely what it does to the block (that is,
> you have to inflect it as a verb, not a noun -- you are telling the
> block to be silent). Finally, since this is the purest form of
> syntactic sugar, I cannot fathom any parsing, interpreting or other
> complications that would arise.
> 
> I appreciate any feedback, including frank statements that you'd
> rather not trifle with such nonsense.
> 
> ~Oren
> 
> [1] http://www.google.com/codesearch?q=except%3A\spass&hl=en
> [2] http://www.google.com/codesearch?hl=en&lr=&q=silence+lang%3Apy

Bare excepts are a very bad idea. And you want syntactic sugar for them?

Aargh! :-)


From invalid at invalid.invalid  Wed Mar  3 10:30:36 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Wed, 3 Mar 2010 15:30:36 +0000 (UTC)
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <kyoevn.k63@spenarnc.xs4all.nl>
	<hmk60h$nce$1@reader1.panix.com> <7v69rcFcmeU1@mid.individual.net>
	<hmltsi$jcd$1@reader1.panix.com>
Message-ID: <hmlvas$2a6$1@reader1.panix.com>

On 2010-03-03, Grant Edwards <invalid at invalid.invalid> wrote:
> On 2010-03-03, Gregory Ewing <greg.ewing at canterbury.ac.nz> wrote:
>> Grant Edwards wrote:
>>
>>> Just a mediocre copy of the CP/M filesystem, which was in turn
>>> copied from DEC's RSTS or RSX.
>>
>> It was actually an improvement over CP/M's file system. CP/M
>> didn't have hierarchical directories
>
> Neither did the original MS-DOS filesystem.
>
>> or timestamps and recorded file sizes in 128-byte blocks
>> rather than bytes.
>
> I thought that was true of the original MS-DOS filesystem as
> well, but I wouldn't bet money on it.

I definitely remember that old MS-DOS programs would treat
Ctrl-Z as an EOF marker when it was read from a text file and
would terminate a text file with a Ctrl-Z when writing one.

I don't know if that was because the underlying filesystem was
still did everything in blocks or if it was because those
MS-DOS programs were direct ports of CP/M programs.  I would
have sworn that the orignal MS-DOS file API was FCB based and
worked almost exactly like CP/M.  IIRC, the "byte stream" API
showed up (in the OS) sever versions later.  The byte stream
API was implemented by many compiler vendor's C libraries on
top of the block-oriented FCB API.

-- 
Grant Edwards               grant.b.edwards        Yow! I had a lease on an
                                  at               OEDIPUS COMPLEX back in
                              gmail.com            '81 ...


From mrmakent at gmail.com  Wed Mar  3 10:39:05 2010
From: mrmakent at gmail.com (Mike Kent)
Date: Wed, 3 Mar 2010 07:39:05 -0800 (PST)
Subject: A "scopeguard" for Python
References: <hmlu55$n1s$1@news.eternal-september.org>
Message-ID: <57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>

What's the compelling use case for this vs. a simple try/finally?

   original_dir = os.getcwd()
   try:
       os.chdir(somewhere)
       # Do other stuff
   finally:
       os.chdir(original_dir)
       # Do other cleanup


From efruttero at hotmail.com  Wed Mar  3 10:40:48 2010
From: efruttero at hotmail.com (efruttero at hotmail.com)
Date: Wed, 3 Mar 2010 07:40:48 -0800 (PST)
Subject: Smalltalk-like categories for methods ?
Message-ID: <8f66e5eb-3dda-4f7a-b607-cd7f2ea0e16b@c16g2000yqd.googlegroups.com>

Hello,

Is there an IDE that supports methods categories/classification,
either through some comment convention, annotation, or any other
mean ?


Thanks in advance,

Eric Fruttero



From steve at holdenweb.com  Wed Mar  3 10:42:20 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 03 Mar 2010 10:42:20 -0500
Subject: Queue peek?
In-Reply-To: <8bbd0a04-9a13-4f36-91c7-80f07bee0952@y17g2000yqd.googlegroups.com>
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>
	<58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>
	<mailman.138.1267559095.23598.python-list@python.org>	<hmjqkr$r46$1@news.eternal-september.org>
	<eae285401003021233i7a62771h590a557341f10ca4@mail.gmail.com>
	<hmk1er$mlb$1@dough.gmane.org>	<1267567723.4101.28.camel@localhost.localdomain>
	<mailman.156.1267578012.23598.python-list@python.org>	<7v6cf4FnnrU1@mid.individual.net>
	<8bbd0a04-9a13-4f36-91c7-80f07bee0952@y17g2000yqd.googlegroups.com>
Message-ID: <hmm00u$mk0$1@dough.gmane.org>

Veloz wrote:
> On Mar 3, 1:14 am, Gregory Ewing <greg.ew... at canterbury.ac.nz> wrote:
>> MRAB wrote:
>>> I suppose it depends on the complexity of the data structure. A dict's
>>> methods are threadsafe, for example, but if you have a data structure
>>> where access leads to multiple method calls then collectively they need
>>> a lock.
>> It also depends on the nature of the objects being used
>> as dict keys. Dict operations invoke the hashing and
>> comparison methods of the keys, which in general can
>> execute arbitrary Python code.
>>
>> If the keys are elementary built-in types such as
>> strings or ints, then dict operations will *probably*
>> be atomic. But I think I'd use a lock anyway, to be
>> on the safe side.
>>
>> --
>> Greg
> 
> Unless I missed where you guys were going, I think we got off the main
> point. The main question at hand was this: what's the best way (heck,
> any way) to implement a sort of "peek" whereby a number of processes
> can write results to some common "object" and some other process can
> "peek" into this object, looking for specific items they're interested
> in?
> 
> I've tried doing this with a queue, as follows: children all write
> results to queue, each result has an identifier.  Another interested
> party, which wants to know if identifier XXX has been placed in the
> queue, removes all the items, one by one from the queue, "keeps" the
> one matching the identifier (if found) and puts the rest of the items
> back on the queue, so other interested parties can also look through
> it.
> 
> This is not a good solution, but it illustrates what I'm trying to
> achieve..
> 
> I'm looking at multiprocessing.Manager, ctypes, etc, but nothing's
> really jumped out.
> 
> I also tried creating my own list class which uses locks to provide a
> "peek and remove" method, but I don't have a good way to share an
> instance of this object across processes.
> 
> Any thoughts would be welcomed!
> Michael

Sounds to me like you are using one queue when you should be using
several. If a single process wants to distribute information to multiple
clients, have a queue for each client. This makes it easy for each
client to find out if it has work (if it does its queue is non-empty),

Is this helpful, or a red herring?

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From mwilson at the-wire.com  Wed Mar  3 10:43:25 2010
From: mwilson at the-wire.com (Mel)
Date: Wed, 03 Mar 2010 10:43:25 -0500
Subject: Re Interest check in some delicious syntactic sugar for
	"except:pass"
References: <35e00b331003030347x30f3f2faua96a9b72814743da@mail.gmail.com>
	<mailman.191.1267627775.23598.python-list@python.org>
Message-ID: <hmm05e$16i$1@speranza.aioe.org>

Tim Chase wrote:
> I admit there are times I've done something similar, usually with
> what I call my "int0" and "float0" utility functions which
> roughly translate to "give me a stinkin' int/float and if
> something goes wrong, give me 0, but the return result better
> darn well be an int/float!" functions.  But as you describe and
> was later commended as a right-ish way to approach it,
> abstracting that off into a function with minimal code in the
> try: block is the right way to go.
[ ... ] 
 
> def int0(v):
>    """converts v to a int, or returns 0 if it can't"""
>    try:
>      return int(v)
>    except: # usually a ValueError but catch all cases
>      try:
>        # int("1.1") fails so try float()ing it first
>        return int(round(float(v)))
>      except:
>        return 0
> 
> def float0(v):
>    """converts v to a float, or returns 0 if it can't"""
>    try:
>      return float(v)
>    except:
>      return 0.0

I think replacing `except:` with `except StandardError:` would work as well, 
and be correct, too.

	Mel.




From mrkafk at gmail.com  Wed Mar  3 10:46:37 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 16:46:37 +0100
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <7x635fdcth.fsf@ruckus.brouhaha.com>
References: <mailman.34.1267409372.23598.python-list@python.org>	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<mailman.64.1267463648.23598.python-list@python.org>	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>	<7xljebyl56.fsf@ruckus.brouhaha.com>	<mailman.70.1267468806.23598.python-list@python.org>	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>	<7xhbozrfy4.fsf@ruckus.brouhaha.com>	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
Message-ID: <hmm08u$ock$1@dough.gmane.org>

Paul Rubin wrote:
> Patrick Maupin <pmaupin at gmail.com> writes:
>> One of my complaints.  If you had read the document you would have
>> seen others.  I actually have several complaints about YAML, but I
>> tried to write a cogent summary.

> Yaml sucks, but seems to have gotten some traction regardless.
> Therefore the Python principle of "there should be one and only one
> obvious way to do it" says: don't try to replace the existing thing if
> your new thing is only slightly better.  

With all due respect, Paul, and with thanks for all the help you've 
given me, I have to disagree here: this is a really, really complicated 
matter and I think there is a case even for making things slightly better.

I think this is a matter of "investment period", so to speak: is it 
short or long? In short term, it absolutely makes no sense to produce 
even slight improvement.

But in the long run it will almost certainly pay off to switch to smth 
even somewhat better implementation (say, imaginary "20%" if you get my 
drift): suppose we stay with sucky format for 10 years. Wouldn't it make 
sense to implement a new one and be "in red" in terms of effort expended 
versus saved for 3 years, but then be "in black" for the following 7 years?

> Just deal with the existing
> thing's imperfections or make improvements to it.  

OK, but how? How would you make up e.g. for JSON's lack of comments? 
Producing accompanying ".json-comment" format and writing libraries that 
parse the comments and interleave them with JSON file for producing 
human-readable commented output?

I think the effort required by all parties, both developers and users, 
before they produced smth like this and learned to use this widely and 
comprehensively, for this manner of improvement would be so high that it 
would be actually cheaper to dump the thing and develop smth new that 
has built-in support for comments.

If you mean some other method of improving existing things like formats, 
well let's hear it; but I for one don't see any worth doing to 
significant extent really, other than dumping the thing or producing 
next, improved version at least.

Improvement: other than making basic tools like parsing libraries 
editors, what improvements can you realistically make? And such 
improvements in and of themselves are not very expensive: my GPL 
Notepad++ has syntax highlighting for YAML (on top of gazillion other 
languages), and there are parsing libraries for it. So where's this 
terrible cost to it?

OTOH, if YAML produces net benefit for as few as, say, 200 people in 
real world, the effort to make it has been well worth it.

> If you can make a
> really powerful case that your new thing is 1000x better than the old
> thing, that's different, but I don't think we're seeing that here.

Perhaps in ideal world we would be able to develop smth good or at least 
decent without long series of abominations preceding it.

But I don't think we live in such world and I don't think it's possible 
to produce a decent format (or language) without decades of having to 
deal with abominations first. We learn as we go along, there's no way 
but to produce whatever works best at the moment, learning from it, 
dumping it and then doing smth better. I don't think e.g. Python could 
be produced without C, COBOL and Fortran preceding it: it's important 
not only to know how to do it, but also how (and why) not to do it, and 
learning that can't be done without producing some sort of abomination.

I'd argue that abominations are inevitable price of progress and evolution.

> Also, XML is used for pretty much everything in the Java world.  It
> sucks too, but it is highly standardized, it observably gets the job
> done, there are tons of structure editors for it, etc.  Frankly
> I'd rather have stayed with it than deal with Yaml.

http://myarch.com/why-xml-is-bad-for-humans

http://www.ibm.com/developerworks/xml/library/x-sbxml.html

Such reasons alone are enough to consider dumping XML for smth better.

Today I had to hand-edit XML config files for two programs (no other 
option). The files were rather large, complicated and doing it frankly 
sucked.

I also have to maintain a few applications that internally use XML as 
data format: while they are tolerable, they still leave smth to be 
desired, as those applications are really slow for larger datasets, 
their users systematically make errors (like forgetting to attach DTD 
before editing), and working across various versions of Windows is still 
not perfect.

If somebody out there invents smth that is better than XML "only" by 
half, I'm all for it.

> There are too many of these damn formats.  We should ban all but one of
> them (I don't much care which one).  And making even more of them is not
> the answer.

I think this is a situation of "beware of what you wish for". Suppose 
those alternative formats disappeared and you'd have no tools, however 
imperfect, to use them: I think that in many, many contexts deficiencies 
of "the" format would be so painful that most developers would just 
write their own "private" ones, and everyone would be even worse off 
than they are now.

I wouldn't worry too much about "stretching scarce resources thin" 
either: abominations completely unfit to live waste little in the way of 
resources, and we learn a deal off them too.

There are demonstrable benefits to this too: I for one am happy that 
ReST is available for me and I don't have to learn a behemoth such as 
DocBook to write documentation.

(imaginary dialog:

Paul: "eat your greens and learn your DocBook!"

Me: "but I don't like it and there's too much of it..."

;-)

OK me off the soapbox.

Regards,
mk



From bruno.42.desthuilliers at websiteburo.invalid  Wed Mar  3 10:48:43 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 03 Mar 2010 16:48:43 +0100
Subject: Method / Functions - What are the differences?
In-Reply-To: <mailman.193.1267628313.23598.python-list@python.org>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>	<4b8c2a34$0$10470$426a74cc@news.free.fr>	<mailman.81.1267492052.23598.python-list@python.org>	<4b8cd310$0$4604$426a34cc@news.free.fr>	<mailman.109.1267539415.23598.python-list@python.org>	<hmk1mn$70u$1@newsreader3.netcologne.de>	<4b8e4041$0$17447$426a34cc@news.free.fr>
	<mailman.193.1267628313.23598.python-list@python.org>
Message-ID: <4b8e84d2$0$10157$426a74cc@news.free.fr>

John Posner a ?crit :
> On 3/3/2010 5:56 AM, Bruno Desthuilliers wrote:
>> Eike Welk a ?crit :
>>> John Posner wrote:
>>>> I've updated the text at this location:
>>>>
>>>> > http://cl1p.net/bruno_0301.rst/
>>>
>>> I think this is a very useful writeup!
>>> It would be perfect with a little bit of introduction that says:
>>> 1. - What it is: "The rough details of method look-up";
>>> 2. - which contains some of the questions that that made that authors
>>> write the text. This way people with similar questions can find it
>>> with Google.
>>>
>>
>> John, do you think you could something with the following ?
> 
> Sure thing, Bruno. I'll incorporate/edit your new text below into a 
> Python Wiki entry. The headings in the Documentation table of contents 
> page (http://wiki.python.org/moin/Documentation) seem pretty sober, so I 
> plan to use a straightforward title:
> 
>   FromFunctionsToMethods

What about "TheMagicBehindMethods" ? Mmm, not sure, so do what you think 
is best.

> ... instead of the clearly superior ...
> 
>   ItsAFunctionItsAMethodItsAUseOfTheDescriptorProtocol
> 
> Does this article belong in the "Advanced Topics" section of the page? 
> I'm not sure, but I'll place it there for now. (Alternative suggestions 
> welcome!)

I spotted this:

http://www.python.org/doc/faq/programming/#what-is-a-method
http://www.python.org/doc/faq/general/#why-must-self-be-used-explicitly-in-method-definitions-and-calls

Our text is probably a bit too long for a direct inclusion in the FAQ, 
so I'd say it should go in the AdvancedTopics, and be linked from the FAQ.

> 
> Yow, the mantle of responsibility weighs heavily upon my poor shoulders!

!-)


Thanks for doing the grunt work.


From alfps at start.no  Wed Mar  3 10:56:25 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 03 Mar 2010 16:56:25 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
Message-ID: <hmm0rd$a48$1@news.eternal-september.org>

* Mike Kent:
> What's the compelling use case for this vs. a simple try/finally?

if you thought about it you would mean a simple "try/else". "finally" is always 
executed. which is incorrect for cleanup

by the way, that's one advantage:

a "with Cleanup" is difficult to get wrong, while a "try" is easy to get wrong, 
as you did here


   ---

another general advantage is as for the 'with' statement generally



>    original_dir = os.getcwd()
>    try:
>        os.chdir(somewhere)
>        # Do other stuff

also, the "do other stuff" can be a lot of code

and also, with more than one action the try-else introduces a lot of nesting


>    finally:
>        os.chdir(original_dir)
>        # Do other cleanup


cheers & hth.,

- alf


From mrkafk at gmail.com  Wed Mar  3 11:10:08 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 17:10:08 +0100
Subject: Queue peek?
In-Reply-To: <8bbd0a04-9a13-4f36-91c7-80f07bee0952@y17g2000yqd.googlegroups.com>
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>
	<58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>
	<mailman.138.1267559095.23598.python-list@python.org>	<hmjqkr$r46$1@news.eternal-september.org>
	<eae285401003021233i7a62771h590a557341f10ca4@mail.gmail.com>
	<hmk1er$mlb$1@dough.gmane.org>	<1267567723.4101.28.camel@localhost.localdomain>
	<mailman.156.1267578012.23598.python-list@python.org>	<7v6cf4FnnrU1@mid.individual.net>
	<8bbd0a04-9a13-4f36-91c7-80f07bee0952@y17g2000yqd.googlegroups.com>
Message-ID: <hmm1l0$u6i$1@dough.gmane.org>

Veloz wrote:

> Unless I missed where you guys were going, I think we got off the main
> point. The main question at hand was this: what's the best way (heck,
> any way) to implement a sort of "peek" whereby a number of processes
> can write results to some common "object" and some other process can
> "peek" into this object, looking for specific items they're interested
> in?

I have used threads so far and not multiprocessing (much), so I'll 
describe it using threads:

If I were you, I'd do it the simplest possible way, with dictionary and 
lock, in the following way:

1. Have shared "queue" of tasks, say, a dictionary.

2. Each worker thread and central "queue manager" access the queue in 
the same manner:

...do your stuff, prepare yourself

acquire a lock

update or read value from queue

...don't do much here to be able release lock quickly

release the lock

...process value

If you had your dictionary simple, it could work like Daniel Stutzbach 
wrote, that updates are thread safe and perhaps you could even dispense 
with locks and just read the dictionary; and if you wanted to use locks, 
for "peek"ing you could write a function that could e.g. acquire a lock, 
do a copy of the queue, release the lock, and return the copy to the 
object wanting to examine the queue.

I have used this approach (although with a list, not a dictionary -- I 
haven't had the need to do extensive searching by keys) and so far it 
has worked for me.

Regards,
mk



From steve at REMOVE-THIS-cybersource.com.au  Wed Mar  3 11:10:50 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 03 Mar 2010 16:10:50 GMT
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <kyoevn.k63@spenarnc.xs4all.nl>
	<hmk60h$nce$1@reader1.panix.com> <7v69rcFcmeU1@mid.individual.net>
	<hmltsi$jcd$1@reader1.panix.com> <hmlvas$2a6$1@reader1.panix.com>
Message-ID: <4b8e8a0a$0$27863$c3e8da3@news.astraweb.com>

On Wed, 03 Mar 2010 15:30:36 +0000, Grant Edwards wrote:

> I definitely remember that old MS-DOS programs would treat Ctrl-Z as an
> EOF marker when it was read from a text file and would terminate a text
> file with a Ctrl-Z when writing one.

I believe that Windows (at least up to Windows XP) still supports using 
ctrl-Z as EOF when reading text files.


-- 
Steven


From darcy at druid.net  Wed Mar  3 11:12:48 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Wed, 3 Mar 2010 11:12:48 -0500
Subject: Docstrings considered too complicated
In-Reply-To: <4B8E7538.2080003@mrabarnett.plus.com>
References: <20100224212303.242222c6@geekmail.INVALID>
	<eq4l57-okf2.ln1@ozzie.tundraware.com>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <7uu1ooFiipU1@mid.individual.net>
	<4B89D8BE.2040905@mrabarnett.plus.com> <4B8B9845.70604@sequans.com>
	<mailman.59.1267456634.23598.python-list@python.org>
	<7v695nFa0fU1@mid.individual.net>
	<4B8E7538.2080003@mrabarnett.plus.com>
Message-ID: <20100303111248.7f40d659.darcy@druid.net>

On Wed, 03 Mar 2010 14:42:00 +0000
MRAB <python at mrabarnett.plus.com> wrote:
> Gregory Ewing wrote:
> Mk14 from Science of Cambridge, a kit with hex keypad and 7-segment
> display, which I had to solder together, and also make my own power
> supply. I had the extra RAM and the I/O chip, so that's 256B (including
> the memory used by the monitor) + 256B additional RAM + 128B more in the
> I/O chip.

In case some of you youngsters think that there is a typo in the above,
no, he means a total of 640 bytes.  In today's terms that would be
approx 0.0000006GB.

Makes me want to go down to the basement and fire up the Altair.  :-)

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


From alfps at start.no  Wed Mar  3 11:14:29 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 03 Mar 2010 17:14:29 +0100
Subject: Docstrings considered too complicated
In-Reply-To: <4b8e8a0a$0$27863$c3e8da3@news.astraweb.com>
References: <20100224212303.242222c6@geekmail.INVALID>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>
	<kyoevn.k63@spenarnc.xs4all.nl>	<hmk60h$nce$1@reader1.panix.com>
	<7v69rcFcmeU1@mid.individual.net>	<hmltsi$jcd$1@reader1.panix.com>
	<hmlvas$2a6$1@reader1.panix.com>
	<4b8e8a0a$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <hmm1t8$gft$1@news.eternal-september.org>

* Steven D'Aprano:
> On Wed, 03 Mar 2010 15:30:36 +0000, Grant Edwards wrote:
> 
>> I definitely remember that old MS-DOS programs would treat Ctrl-Z as an
>> EOF marker when it was read from a text file and would terminate a text
>> file with a Ctrl-Z when writing one.
> 
> I believe that Windows (at least up to Windows XP) still supports using 
> ctrl-Z as EOF when reading text files.

It does, at least when the Ctrl Z is the sole contents of a "line".

And it's a pain. :-(

As a practical matter, when entering text in a console window the F6 key 
generates Ctrl Z.


Cheers,

- Alf


From steve at REMOVE-THIS-cybersource.com.au  Wed Mar  3 11:16:55 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 03 Mar 2010 16:16:55 GMT
Subject: Re Interest check in some delicious syntactic sugar for
	"except:pass"
References: <mailman.178.1267616851.23598.python-list@python.org>
Message-ID: <4b8e8b77$0$27863$c3e8da3@news.astraweb.com>

On Wed, 03 Mar 2010 06:47:28 -0500, Oren Elrad wrote:

> With that said, let me at least offer a token defense of my position. By
> way of motivation, I wrote that email after copying/pasting the
> following a few times around a project until I wrote it into def
> SilentlyDelete() and its cousin SilentlyRmdir()
> 
> """ code involving somefile """
> try:
> ........os.remove(somefile)
> except:
> .......pass     # The bloody search indexer has got the file and I can't
> delete it. Nothing to be done.

Or:

(1) you forgot to import the os module
(2) the os module (or os.remove) was rebound or monkey-patched to 
something unexpected
(3) you have a bug in your code and somefile=23 (say) instead of the 
filename you're expecting
(4) the user hit the interrupt key just at that instance
(5) somefile doesn't exist
(6) somefile does exist, but you don't have write-permission for it
(7) the disk is mounted read-only
(8) you don't have a search indexer and something else has gone wrong

Hiding all those different errors is, quite frankly, shoddy work.

#1-3 certainly shouldn't be hidden, as they are bugs in your program. #4 
shouldn't be hidden, ignoring the user's interrupt command is bad, and 
rude if it is deliberate. #5 probably shouldn't be hidden either, as it 
most likely indicates a program bug, but some rare applications may be 
okay with ignoring it. And #6-8 should be told to the user, so they can 
fix the problem.



-- 
Steven


From floris.bruynooghe at gmail.com  Wed Mar  3 11:17:32 2010
From: floris.bruynooghe at gmail.com (Floris Bruynooghe)
Date: Wed, 3 Mar 2010 08:17:32 -0800 (PST)
Subject: Queue peek?
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>
	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>
Message-ID: <137d7aa5-a305-4091-a244-904b680d3b56@t41g2000yqt.googlegroups.com>

On Mar 2, 6:18?pm, Raymond Hettinger <pyt... at rcn.com> wrote:
> On Mar 2, 8:29?am, Veloz <michaelve... at gmail.com> wrote:
>
> > Hi all
> > I'm looking for a queue that I can use with multiprocessing, which has
> > a peek method.
>
> > I've seen some discussion about queue.peek but don't see anything in
> > the docs about it.
>
> > Does python have a queue class with peek semantics?
>
> Am curious about your use case? ?Why peek at something
> that could be gone by the time you want to use it.
>
> ? val = q.peek()
> ? if something_i_want(val):
> ? ? ? ?v2 = q.get() ? ? ? ? # this could be different than val
>
> Wouldn't it be better to just get() the value and return if you don't
> need it?
>
> ? val = q.peek()
> ? if not something_i_want(val):
> ? ? ? q.put(val)

What I have found myself wanting when thinking of this pattern is a
"q.put_at_front_of_queue(val)" method.  I've never actually used this
because of not having such a method.  Not that it's that much of an
issue as I've never been completely stuck and usually found a way to
solve whatever I was trying to do without peeking, which could be
argued as a better design in the first place.  I was just wondering if
other people ever missed the "q.put_at_front_of_queue()" method or if
it is just me.

Regards
Floris

PS: assuming "val = q.get()" on the first line


From johnfilben at yahoo.com  Wed Mar  3 11:19:08 2010
From: johnfilben at yahoo.com (John Filben)
Date: Wed, 3 Mar 2010 08:19:08 -0800 (PST)
Subject: Sort Big File Help
Message-ID: <374400.23537.qm@web33805.mail.mud.yahoo.com>

I am new to Python but have used many other (mostly dead) languages in the past.? I want to be able to process *.txt and *.csv files.? I can now read that and then change them as needed ? mostly just take a column and do some if-then to create a new variable.? My problem is sorting these files:
1.)??? How do I sort file1.txt by position and write out file1_sorted.txt; for example, if all the records are 100 bytes long and there is a three digit id in the position 0-2; here would be some sample data:
a.?????? 001JohnFilben??
b.????? 002Joe? Smith?..
2.)??? How do I sort file1.csv by column name; for example, if all the records have three column headings, ?id?, ?first_name?, ?last_name?; ?here would be some sample data:
a.?????? Id, first_name,last_name
b.????? 001,John,Filben
c.?????? 002,Joe, Smith
3.)??? What about if I have millions of records and I am processing on a laptop with a large external drive ? basically, are there space considerations? What are the work arounds.
Any help would be appreciated. Thank you.

?John Filben
Cell Phone - 773.401.2822
Email - johnfilben at yahoo.com 


      
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From drobinow at gmail.com  Wed Mar  3 11:22:06 2010
From: drobinow at gmail.com (David Robinow)
Date: Wed, 3 Mar 2010 11:22:06 -0500
Subject: Docstrings considered too complicated
In-Reply-To: <hmlvas$2a6$1@reader1.panix.com>
References: <20100224212303.242222c6@geekmail.INVALID>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <kyoevn.k63@spenarnc.xs4all.nl>
	<hmk60h$nce$1@reader1.panix.com> <7v69rcFcmeU1@mid.individual.net>
	<hmltsi$jcd$1@reader1.panix.com> <hmlvas$2a6$1@reader1.panix.com>
Message-ID: <4eb0089f1003030822t2a7ec46au57a03de266a4d630@mail.gmail.com>

On Wed, Mar 3, 2010 at 10:30 AM, Grant Edwards <invalid at invalid.invalid> wrote:
> On 2010-03-03, Grant Edwards <invalid at invalid.invalid> wrote:
> I definitely remember that old MS-DOS programs would treat
> Ctrl-Z as an EOF marker when it was read from a text file and
> would terminate a text file with a Ctrl-Z when writing one.

Actually cmd.exe (at least on Windows XP) still treats Ctrl-Z as an EOF marker.


From mrkafk at gmail.com  Wed Mar  3 11:26:19 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 17:26:19 +0100
Subject: taking python enterprise level?...
In-Reply-To: <20100302015813.5397655e.darcy@druid.net>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>
	<20100302015813.5397655e.darcy@druid.net>
Message-ID: <hmm2jc$28u$1@dough.gmane.org>

D'Arcy J.M. Cain wrote:
> I keep seeing this statement but nothing to back it up.  I have created
> many apps that run on Python with a PostgreSQL database with a fully
> normalized schema and I can assure you that database joins were never
> my problem unless I made a badly constructed query or left off a
> critical index.

I too have done that (Python/PGSQL), even adding a complicated layer of 
SQLAlchemy on top of it and have not had issue with this: when I 
profiled one of my apps, it turned out that it spent most of its 
computation time... rendering HTML. Completely unexpected: I expected DB 
to be bottleneck (although it might be that with huge datasets this 
might change).

Having said that, re evidence that joins are bad: from what I've *heard* 
about Hibernate in Java from people who used it (I haven't used 
Hibernate apart from "hello world"), in case of complicated object 
hierarchies it supposedly generates a lot of JOINs and that supposedly 
kills DB performance.

So there *may* be some evidence that joins are indeed bad in practice. 
If someone has smth specific/interesting on the subject, please post.

Regards,
mk





From phil at freehackers.org  Wed Mar  3 11:32:12 2010
From: phil at freehackers.org (BlueBird)
Date: Wed, 3 Mar 2010 08:32:12 -0800 (PST)
Subject: SOAP 1.2 Python client ?
Message-ID: <5a36bd30-6cbd-48ca-9ca3-dc34c97e03c0@o30g2000yqb.googlegroups.com>


Hi,

I am looking for a SOAP 1.2 python client. To my surprise, it seems
that this does not exist. Does anybody know about this ?

The following clients seem to be both unmaintained and still
supporting only SOAP 1.1 :

- SUDS
- zsi
- SOAPy


cheers,

Philippe


From jjposner at optimum.net  Wed Mar  3 11:32:55 2010
From: jjposner at optimum.net (John Posner)
Date: Wed, 03 Mar 2010 11:32:55 -0500
Subject: Method / Functions - What are the differences?
In-Reply-To: <hmlte9$d0f$1@dough.gmane.org>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>	<4b8c2a34$0$10470$426a74cc@news.free.fr>	<mailman.81.1267492052.23598.python-list@python.org>	<4b8cd310$0$4604$426a34cc@news.free.fr>	<mailman.109.1267539415.23598.python-list@python.org>	<hmk1mn$70u$1@newsreader3.netcologne.de>	<4b8e4041$0$17447$426a34cc@news.free.fr>
	<hmlte9$d0f$1@dough.gmane.org>
Message-ID: <hmm2ur$3bv$1@dough.gmane.org>

On 3/3/2010 9:58 AM, John Posner wrote:

> Film at 11,
> John
>

Done -- see http://wiki.python.org/moin/FromFunctionToMethod

-John



From showell30 at yahoo.com  Wed Mar  3 11:37:54 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Wed, 3 Mar 2010 08:37:54 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org> 
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com> 
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
	<mailman.199.1267631220.23598.python-list@python.org>
Message-ID: <7071cfa0-0485-4192-b3ee-8e12d9f1fca2@f17g2000prh.googlegroups.com>

On Mar 3, 7:46?am, mk <mrk... at gmail.com> wrote:
> Paul Rubin wrote:
> > Patrick Maupin <pmau... at gmail.com> writes:
> >> One of my complaints. ?If you had read the document you would have
> >> seen others. ?I actually have several complaints about YAML, but I
> >> tried to write a cogent summary.
> > Yaml sucks, but seems to have gotten some traction regardless.
> > Therefore the Python principle of "there should be one and only one
> > obvious way to do it" says: don't try to replace the existing thing if
> > your new thing is only slightly better. ?
>
> With all due respect, Paul, and with thanks for all the help you've
> given me, I have to disagree here: this is a really, really complicated
> matter and I think there is a case even for making things slightly better.
>
> I think this is a matter of "investment period", so to speak: is it
> short or long? In short term, it absolutely makes no sense to produce
> even slight improvement.
>
> But in the long run it will almost certainly pay off to switch to smth
> even somewhat better implementation (say, imaginary "20%" if you get my
> drift): suppose we stay with sucky format for 10 years. Wouldn't it make
> sense to implement a new one and be "in red" in terms of effort expended
> versus saved for 3 years, but then be "in black" for the following 7 years?
>

I think ten years is about the right horizon to be looking down.
Anything further than ten years is probably so speculative as to have
lots of diminishing returns, although I admire people who have really
BIG ideas and are starting on them now.  (The particular context of
this thread doesn't lead to big ideas, unless I just lack
imagination.)

I think it's wrong, though, only to look five years ahead.  If the
only goal was to make software development easier in 2015, then I'd
say, by all means, let's pick the current best-of-breed tools and
simply perfect them as much as we can.  This is a worthwhile goal
regardless of your ultimate time horizon, and that effort tends to
happen anyway, since so many people rightly live in the here and
now.

Somewhere in the 2020s, though, I predict that a lot of technologies
are either going to finally die off, or at least be restricted to the
niches that they serve well.  Take Java, for example.  I think it will
be still be used, and people will still even be writing new programs
in it, but it will be rightly scorned in a lot of places where it is
now embraced.  Some of this won't actually be due to technological
advances, but just changes in perception.  For example, I predict lots
of programs that people now write in Java will be written in Python,
even if the core language of Python remains fairly stable.

Beyond just changing mindsets, though, I think evolution is
inevitable.  Some subset of Python tools will almost certainly develop
features that are more friendly to the Java mindset, but work in
Python, and this will help move folks from Java to Python.  I also
think that Java will be supplanted for lots of use cases by some
languages invented after 2000.  Maybe Scala will become more
mainstream.  Maybe Go will turn into more of an enterprise-y
platform.  Who knows?

With regard to XML, I think at a bare minimum, folks will stop using
XML for use cases that YAML, JSON, and maybe even RSON serve better
today.  I bet that at least one of YAML and JSON survives in some
form, and my money is on JSON, but I bet there will also be some new
competing formats.  I also think that we'll still have multiple
formats that are only marginally better than each other for general
use cases, but which people will still choose for specific reasons.
Developers *love* good tools almost as much as they hate confusion--
there will always be tension between having too many choices and not
enough.

Going back to Paul's statement, I agree that "there should be one and
only one obvious way to do it" in Python, but I don't think the
philosophy applies to the greater ecosystem of software development.
In our generation I think we have the live with the confusion and
chaos that comes from a plethora of tools, and that's just part of
progress.  Ironically, I think the tools that survive will be very
focused in their own right; it's just that we'll still have many to
choose from.

Going back to XML, I found myself using it last night for a completely
inappropriate use case.  It so happens that it would have been about
100% better if it had simply been written in JSON, so there was no
compelling need for yet another alternative.  But if the inventers of
JSON had been complacent about XML, we wouldn't even have that as an
option.  And, of course, there is nothing radical at all about JSON--I
am pretty sure it was just a common sense realization about the
inadequacies of current technologies that led to its development, and
I'm sure early versions of it were pretty raw.  Without having looked
into RSON, I am sure it's the same mindset that drives its invention--
current tools exist that can get the some done, but we can do better.
Whether RSON is really an improvement or not is an orthogonal issue to
whether we should strive for improvement.




From michaelveloz at gmail.com  Wed Mar  3 11:39:18 2010
From: michaelveloz at gmail.com (Veloz)
Date: Wed, 3 Mar 2010 08:39:18 -0800 (PST)
Subject: When to lock data items returned by multiprocessing.Manager?
Message-ID: <4428d674-7fa7-4095-a93d-75ea31a81d9a@15g2000yqi.googlegroups.com>

So I'm using a multiprocessing.Manager instance in my main app and
asking it to create a dictionary, which I am providing to instances of
the application that I'm forking off with Process.

The Processes and main app will be reading/writing to the dictionary.

It's not clear to me what I have to "lock" and what I don't have to
lock. Any ideas?

I'm thinking that what Manager brings to the table is the ability to
share the dictionary but it may not provide anything to control
concurrent access to it, and thus I should lock all operations I
perform on it.. But I don't know this for a fact. Any input is
welcomed on this!!

Michael


From thudfoo at opensuse.us  Wed Mar  3 11:43:24 2010
From: thudfoo at opensuse.us (member thudfoo)
Date: Wed, 3 Mar 2010 08:43:24 -0800
Subject: Writing an assembler in Python
In-Reply-To: <7v6el6F1ddU1@mid.individual.net>
References: <Xns9D28186AF890Cfdnbgui7uhu5h8hrnuio@127.0.0.1>
	<kyo49n.gr4@spenarnc.xs4all.nl> <7v6el6F1ddU1@mid.individual.net>
Message-ID: <3d881a311003030843x14217f0aua4005dbe58caf630@mail.gmail.com>

On Tue, Mar 2, 2010 at 10:52 PM, Gregory Ewing
<greg.ewing at canterbury.ac.nz> wrote:
>> In article <Xns9D28186AF890Cfdnbgui7uhu5h8hrnuio at 127.0.0.1>,
>> Giorgos Tzampanakis ?<gt67 at hw.ac.uk> wrote:
>>
>>> I'm implementing a CPU that will run on an FPGA. I want to have a
>>> (dead) simple assembler that will generate the machine code for
>>> me. I want to use Python for that. Are there any libraries that
>>> can help me with the parsing of the assembly code?
>
> I wrote a PIC assembler in Python once. I didn't bother
> with any parsing libraries. I used a regular expression
> to split the input into tokens, then wrote ad-hoc
> parsing code in Python.
>
> --
> Greg
> --
> http://mail.python.org/mailman/listinfo/python-list
>

I used Plex.

The lexer is here: http://pastebin.com/9Rm4rDfu

The target for the assembler is a toy single-byte processor.


From darcy at druid.net  Wed Mar  3 11:46:03 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Wed, 3 Mar 2010 11:46:03 -0500
Subject: Docstrings considered too complicated
In-Reply-To: <hmltsi$jcd$1@reader1.panix.com>
References: <20100224212303.242222c6@geekmail.INVALID>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <kyoevn.k63@spenarnc.xs4all.nl>
	<hmk60h$nce$1@reader1.panix.com> <7v69rcFcmeU1@mid.individual.net>
	<hmltsi$jcd$1@reader1.panix.com>
Message-ID: <20100303114603.7021e9ba.darcy@druid.net>

On Wed, 3 Mar 2010 15:05:54 +0000 (UTC)
Grant Edwards <invalid at invalid.invalid> wrote:
> > It was actually an improvement over CP/M's file
> > system. CP/M didn't have hierarchical directories
> 
> Neither did the original MS-DOS filesystem.

I think that it always had a hierarchical file system although I am not
sure about 86-DOS or QDOS on which is was based.

> > or timestamps and recorded file sizes in 128-byte blocks
> > rather than bytes.
> 
> I thought that was true of the original MS-DOS filesystem as
> well, but I wouldn't bet money on it.

And that is why text files in MS-DOS and CP/M before it end with ^Z.
They needed a way to tell where the end of the information was.  Why
they used ^Z (SUB - Substitute) instead of ^C (ETX - End of TeXt) or
even ^D (EOT - End Of Transmission) is anyone's guess.

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


From robert.kern at gmail.com  Wed Mar  3 12:00:04 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 03 Mar 2010 11:00:04 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
Message-ID: <hmm4ik$a1h$1@dough.gmane.org>

On 2010-03-03 09:39 AM, Mike Kent wrote:
> What's the compelling use case for this vs. a simple try/finally?
>
>     original_dir = os.getcwd()
>     try:
>         os.chdir(somewhere)
>         # Do other stuff
>     finally:
>         os.chdir(original_dir)
>         # Do other cleanup

A custom-written context manager looks nicer and can be more readable.

from contextlib import contextmanager
import os

@contextmanager
def pushd(path):
     original_dir = os.getcwd()
     os.chdir(path)
     try:
         yield
     finally:
         os.chdir(original_dir)


with pushd(somewhere):
     ...


I don't think a general purpose ScopeGuard context manager has any such benefits 
over the try: finally:, though.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From jjposner at optimum.net  Wed Mar  3 12:02:10 2010
From: jjposner at optimum.net (John Posner)
Date: Wed, 03 Mar 2010 12:02:10 -0500
Subject: Method / Functions - What are the differences?
In-Reply-To: <4b8e84d2$0$10157$426a74cc@news.free.fr>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>	<4b8c2a34$0$10470$426a74cc@news.free.fr>	<mailman.81.1267492052.23598.python-list@python.org>	<4b8cd310$0$4604$426a34cc@news.free.fr>	<mailman.109.1267539415.23598.python-list@python.org>	<hmk1mn$70u$1@newsreader3.netcologne.de>	<4b8e4041$0$17447$426a34cc@news.free.fr>	<mailman.193.1267628313.23598.python-list@python.org>
	<4b8e84d2$0$10157$426a74cc@news.free.fr>
Message-ID: <hmm4lm$ahm$1@dough.gmane.org>

On 3/3/2010 10:48 AM, Bruno Desthuilliers wrote:

>
> I spotted this:
>
> http://www.python.org/doc/faq/programming/#what-is-a-method
> http://www.python.org/doc/faq/general/#why-must-self-be-used-explicitly-in-method-definitions-and-calls
>
>
> Our text is probably a bit too long for a direct inclusion in the FAQ,
> so I'd say it should go in the AdvancedTopics, and be linked from the FAQ.

Linking from the FAQ means changing the official Python documentation, 
which requires lots of hoop-jumping-through. I suggest that we content 
ourselves with using the Wiki -- at least for now.

>
> Thanks for doing the grunt work.

Pas de quoi.

-John





From bruno.42.desthuilliers at websiteburo.invalid  Wed Mar  3 12:03:37 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 03 Mar 2010 18:03:37 +0100
Subject: Method / Functions - What are the differences?
In-Reply-To: <mailman.205.1267633968.23598.python-list@python.org>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>	<4b8c2a34$0$10470$426a74cc@news.free.fr>	<mailman.81.1267492052.23598.python-list@python.org>	<4b8cd310$0$4604$426a34cc@news.free.fr>	<mailman.109.1267539415.23598.python-list@python.org>	<hmk1mn$70u$1@newsreader3.netcologne.de>	<4b8e4041$0$17447$426a34cc@news.free.fr>	<hmlte9$d0f$1@dough.gmane.org>
	<mailman.205.1267633968.23598.python-list@python.org>
Message-ID: <4b8e9660$0$21812$426a34cc@news.free.fr>

John Posner a ?crit :
> On 3/3/2010 9:58 AM, John Posner wrote:
> 
>> Film at 11,
>> John
>>
> 
> Done -- see http://wiki.python.org/moin/FromFunctionToMethod

Done and well done !-)
Thanks again for the good job John.

PS : Do you think it could be possible to add link to this page from the 
relevant FAQ items ?

http://www.python.org/doc/faq/programming/#what-is-a-method
http://www.python.org/doc/faq/general/#why-must-self-be-used-explicitly-in-method-definitions-and-calls 




From nagle at animats.com  Wed Mar  3 12:05:44 2010
From: nagle at animats.com (John Nagle)
Date: Wed, 03 Mar 2010 09:05:44 -0800
Subject: Working group for Python CPAN-equivalence?
In-Reply-To: <87r5o1v8vp.fsf@benfinney.id.au>
References: <mailman.179.1267620332.23598.python-list@python.org>
	<87r5o1v8vp.fsf@benfinney.id.au>
Message-ID: <4b8e929d$0$1585$742ec2ed@news.sonic.net>

Ben Finney wrote:
> Olof Bjarnason <olof.bjarnason at gmail.com> writes:
> 
>> Hi everybody!
>>
>> The "Where is CPAN for Python?" question keeps popping up, with
>> answers ranging from "There is no CPAN for Python" and "We already
>> have CPAN for Python" (confusing).
> 
> Caused in no small measure by the fact that Perl people mean at least
> two distinct things by ?Where is CPAN for Python??:
> 
> * The central package registry, CPAN, with metadata in a standard
>   queryable format, and all registered packages redundantly mirrored and
>   available for installation at user-specified versions.
> 
>   We have an equivalent in PyPI, though it's incomplete since many
>   *registered* packages are not actually hosted *at* PyPI.

    CPAN is a repository.   PyPi is an collection of links.

    CPAN has over 260 mirrors.  PyPi has none.

    CPAN enforces standard organization on packages.  PyPi does not.

    CPAN has quality control, with testers and a test reporting system.
    PyPi does not.

				John Nagle


From emannion at gmail.com  Wed Mar  3 12:05:47 2010
From: emannion at gmail.com (enda man)
Date: Wed, 3 Mar 2010 09:05:47 -0800 (PST)
Subject: using subprocess.Popen  env parameter
Message-ID: <47f5881a-a7bd-4a57-8e2d-ae27cfbf3a9a@x22g2000yqx.googlegroups.com>

Hi,

I want to use the env parameter to subprocess.Popen to pass in a path
to a location the process needs to run,
I do have a env variable already called MS_VC_PATH and I want to add
to it, not set up more in the PATH variable.

/////
ms_vc_path=os.environ['MS_VC_PATH']
cl_path = ms_vc_path + '\VC\bin'
lib_vc_path = ms_vc_path + '\VC\lib'
myenv = os.environ
myenv["PATH"] = cl_path + ";" + lib_vc_path + ";" + myenv["PATH"]

subprocess.Popen("midl /D \"_DEBUG\" /nologo /char signed /env win32 /
Oicf  /tlb \"ActivexPlugin.tlb\" /h \"ActivexPlugin_i.h\" /iid
\"ActivexPlugin_i.c\" /proxy \"ActivexPlugin_p.c\" /error stub_data
ActivexPlugin.idl", env=myenv)

///

but it seems that midl can not see the new path I am sending to it
using the env variable, am I using env correctly?

here is my output:
midl : command line error MIDL1005 : cannot find C preprocessor cl.exe

Any help?
EM


From skylarking11 at gmail.com  Wed Mar  3 12:06:27 2010
From: skylarking11 at gmail.com (Sky Larking)
Date: Wed, 3 Mar 2010 09:06:27 -0800 (PST)
Subject: Installing Scrapy on Mac OS X 10.6
Message-ID: <9b08574f-0410-45bc-89af-0d3cf7d21819@e7g2000yqf.googlegroups.com>

Has anyone successfully installed Scrapy ( http://scrapy.org ) on a
Mac OS X machine running 10.6.x? The Documentaion says
Mac OS X ships an libxml2 version too old to be used by Scrapy...But
doesn't say which version of OS X.. I am wondering if the version of
libxml2 is also not compatible..





From robert.kern at gmail.com  Wed Mar  3 12:09:11 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 03 Mar 2010 11:09:11 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <hmm0rd$a48$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<hmm0rd$a48$1@news.eternal-september.org>
Message-ID: <hmm53o$ca0$1@dough.gmane.org>

On 2010-03-03 09:56 AM, Alf P. Steinbach wrote:
> * Mike Kent:
>> What's the compelling use case for this vs. a simple try/finally?
>
> if you thought about it you would mean a simple "try/else". "finally" is
> always executed. which is incorrect for cleanup

Eh? Failed execution doesn't require cleanup? The example you gave is definitely 
equivalent to the try: finally: that Mike posted. The actions are always 
executed in your example, not just when an exception isn't raised.

 From your post, the scope guard technique is used "to ensure some desired 
cleanup at the end of a scope, even when the scope is exited via an exception." 
This is precisely what the try: finally: syntax is for. The with statement 
allows you to encapsulate repetitive boilerplate into context managers, but a 
general purpose context manager like your Cleanup class doesn't take advantage 
of this.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From alfps at start.no  Wed Mar  3 12:09:53 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 03 Mar 2010 18:09:53 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.209.1267635630.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<mailman.209.1267635630.23598.python-list@python.org>
Message-ID: <hmm554$6l5$1@news.eternal-september.org>

* Robert Kern:
> On 2010-03-03 09:39 AM, Mike Kent wrote:
>> What's the compelling use case for this vs. a simple try/finally?
>>
>>     original_dir = os.getcwd()
>>     try:
>>         os.chdir(somewhere)
>>         # Do other stuff
>>     finally:
>>         os.chdir(original_dir)
>>         # Do other cleanup
> 
> A custom-written context manager looks nicer and can be more readable.
> 
> from contextlib import contextmanager
> import os
> 
> @contextmanager
> def pushd(path):
>     original_dir = os.getcwd()
>     os.chdir(path)
>     try:
>         yield
>     finally:
>         os.chdir(original_dir)
> 
> 
> with pushd(somewhere):
>     ...
> 
> 
> I don't think a general purpose ScopeGuard context manager has any such 
> benefits over the try: finally:, though.

I don't think that's a matter of opinion, since one is correct while the other 
is incorrect.


Cheers,

- ALf


From invalid at invalid.invalid  Wed Mar  3 12:15:02 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Wed, 3 Mar 2010 17:15:02 +0000 (UTC)
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <kyoevn.k63@spenarnc.xs4all.nl>
	<hmk60h$nce$1@reader1.panix.com> <7v69rcFcmeU1@mid.individual.net>
	<hmltsi$jcd$1@reader1.panix.com>
	<mailman.208.1267634665.23598.python-list@python.org>
Message-ID: <hmm5em$hl6$1@reader1.panix.com>

On 2010-03-03, D'Arcy J.M. Cain <darcy at druid.net> wrote:
> On Wed, 3 Mar 2010 15:05:54 +0000 (UTC)
> Grant Edwards <invalid at invalid.invalid> wrote:
>> > It was actually an improvement over CP/M's file
>> > system. CP/M didn't have hierarchical directories
>> 
>> Neither did the original MS-DOS filesystem.
>
> I think that it always had a hierarchical file system

The hierarchical file system wasn't introduced until MS-DOS 2.0.
Versions prior to that were flat filesystem just like CP/M.

>From http://en.wikipedia.org/wiki/File_Allocation_Table

  At the time FAT12 was introduced, DOS did not support hierarchical
  directories, and the maximum number of files was typically limited
  to a few dozen. Hierarchical directories were introduced in MS-DOS
  version 2.0.

-- 
Grant Edwards               grant.b.edwards        Yow! I wonder if I could
                                  at               ever get started in the
                              gmail.com            credit world?


From alfps at start.no  Wed Mar  3 12:18:44 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 03 Mar 2010 18:18:44 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.211.1267636174.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>
	<mailman.211.1267636174.23598.python-list@python.org>
Message-ID: <hmm5ln$arg$1@news.eternal-september.org>

* Robert Kern:
> On 2010-03-03 09:56 AM, Alf P. Steinbach wrote:
>> * Mike Kent:
>>> What's the compelling use case for this vs. a simple try/finally?
>>
>> if you thought about it you would mean a simple "try/else". "finally" is
>> always executed. which is incorrect for cleanup
> 
> Eh? Failed execution doesn't require cleanup? The example you gave is 
> definitely equivalent to the try: finally: that Mike posted.

Sorry, that's incorrect: it's not.

With correct code (mine) cleanup for action A is only performed when action A 
succeeds.

With incorrect code cleanup for action A is performed when A fails.


> The actions 
> are always executed in your example,

Sorry, that's incorrect.


> [The actions are] not [executed] just when an exception isn't  raised.

Sorry, that's incorrect.


>  From your post, the scope guard technique is used "to ensure some 
> desired cleanup at the end of a scope, even when the scope is exited via 
> an exception." This is precisely what the try: finally: syntax is for. 

You'd have to nest it. That's ugly. And more importantly, now two people in this 
thread (namely you and Mike) have demonstrated that they do not grok the try 
functionality and manage to write incorrect code, even arguing that it's correct 
when informed that it's not, so it's a pretty fragile construct, like goto.


> The with statement allows you to encapsulate repetitive boilerplate into 
> context managers, but a general purpose context manager like your 
> Cleanup class doesn't take advantage of this.

I'm sorry but that's pretty meaningless. It's like: "A house allows you to 
encapsulate a lot of stinking garbage, but your house doesn't take advantage of 
that, it's disgustingly clean". Hello.


Cheers & hth.,

- Alf


From xahlee at gmail.com  Wed Mar  3 12:36:26 2010
From: xahlee at gmail.com (Xah Lee)
Date: Wed, 3 Mar 2010 09:36:26 -0800 (PST)
Subject: NoSQL Movement?
Message-ID: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>

recently i wrote a blog article on The NoSQL Movement
at http://xahlee.org/comp/nosql.html

i'd like to post it somewhere public to solicit opinions, but in the
20 min or so, i couldn't find a proper newsgroup, nor private list
that my somewhat anti-NoSQL Movement article is fitting.

So, i thought i'd post here to solicit some opinins from the programer
community i know.

Here's the plain text version

-----------------------------
The NoSQL Movement

Xah Lee, 2010-01-26

In the past few years, there's new fashionable thinking about anti
relational database, now blessed with a rhyming term: NoSQL.
Basically, it considers that relational database is outdated, and not
?horizontally? scalable. I'm quite dubious of these claims.

According to Wikipedia Scalability article, verticle scalability means
adding more resource to a single node, such as more cpu, memory. (You
can easily do this by running your db server on a more powerful
machine.), and ?Horizontal scalability? means adding more machines.
(and indeed, this is not simple with sql databases, but again, it is
the same situation with any software, not just database. To add more
machines to run one single software, the software must have some sort
of grid computing infrastructure built-in. This is not a problem of
the software per se, it is just the way things are. It is not a
problem of databases.)

I'm quite old fashioned when it comes to computer technology. In order
to convience me of some revolutionary new-fangled technology, i must
see improvement based on math foundation. I am a expert of SQL, and
believe that relational database is pretty much the gist of database
with respect to math. Sure, a tight definition of relations of your
data may not be necessary for many applications that simply just need
store and retrieve and modify data without much concern about the
relations of them. But still, that's what relational database
technology do too. You just don't worry about normalizing when you
design your table schema.

The NoSQL movement is really about scaling movement, about adding more
machines, about some so-called ?cloud computing? and services with
simple interfaces. (like so many fashionable movements in the
computing industry, often they are not well defined.) It is not really
about anti relation designs in your data. It's more about adding
features for practical need such as providing easy-to-user APIs (so
you users don't have to know SQL or Schemas), ability to add more
nodes, provide commercial interface services to your database, provide
parallel systems that access your data. Of course, these needs are all
done by any big old relational database companies such as Oracle over
the years as they constantly adopt the changing industry's needs and
cheaper computing power. If you need any relations in your data, you
can't escape relational database model. That is just the cold truth of
math.

Importat data, such as used in the bank transactions, has relations.
You have to have tight relational definitions and assurance of data
integrity.

Here's a second hand quote from Microsoft's Technical Fellow David
Campbell. Source

    I've been doing this database stuff for over 20 years and I
    remember hearing that the object databases were going to wipe out
    the SQL databases. And then a little less than 10 years ago the
    XML databases were going to wipe out.... We actually ... you
    know... people inside Microsoft, [have said] 'let's stop working
    on SQL Server, let's go build a native XML store because in five
    years it's all going....'

LOL. That's exactly my thought.

Though, i'd have to have some hands on experience with one of those
new database services to see what it's all about.

--------------------
Amazon S3 and Dynamo

Look at Structured storage. That seems to be what these nosql
databases are. Most are just a key-value pair structure, or just
storage of documents with no relations. I don't see how this differ
from a sql database using one single table as schema.

Amazon's Amazon S3 is another storage service, which uses Amazon's
Dynamo (storage system), indicated by Wikipedia to be one of those
NoSQL db. Looking at the S3 and Dynamo articles, it appears the db is
just a Distributed hash table system, with added http access
interface. So, basically, little or no relations. Again, i don't see
how this is different from, say, MySQL with one single table of 2
columns, added with distributed infrastructure. (distributed database
is often a integrated feature of commercial dbs, e.g. Wikipedia Oracle
database article cites Oracle Real Application Clusters )

Here's a interesting quote on S3:

    Bucket names and keys are chosen so that objects are addressable
    using HTTP URLs:

        * http://s3.amazonaws.com/bucket/key
        * http://bucket.s3.amazonaws.com/key
        * http://bucket/key (where bucket is a DNS CNAME record
pointing to bucket.s3.amazonaws.com)

    Because objects are accessible by unmodified HTTP clients, S3 can
    be used to replace significant existing (static) web hosting
    infrastructure.

So this means, for example, i can store all my images in S3, and in my
html document, the inline images are just normal img tags with normal
urls. This applies to any other type of file, pdf, audio, but html
too. So, S3 becomes the web host server as well as the file system.

Here's Amazon's instruction on how to use it as image server. Seems
quite simple: How to use Amazon S3 for hosting web pages and media
files? Source

--------------------
Google BigTable

Another is Google's BigTable. I can't make much comment. To make a
sensible comment, one must have some experience of actually
implementing a database. For example, a file system is a sort of
database. If i created a scheme that allows me to access my data as
files in NTFS that are distributed over hundreds of PC, communicated
thru http running Apache. This will let me access my files. To insert,
delete, data, one can have cgi scripts on each machine. Would this be
considered as a new fantastic NoNoSQL?

---------------------

comments can also be posted to
http://xahlee.blogspot.com/2010/01/nosql-movement.html

Thanks.

  Xah
? http://xahlee.org/

?


From dragonx562 at googlemail.com  Wed Mar  3 12:37:45 2010
From: dragonx562 at googlemail.com (luaisn haus)
Date: Wed, 3 Mar 2010 09:37:45 -0800 (PST)
Subject: =?ISO-8859-1?Q?kredit_haus_=2C_eigenheimzulage_einkommensgrenzen_=2C_fi?=
	=?ISO-8859-1?Q?nanzamt_eigenheimzulage_=2C_kredit_f=FCr_haus_kauf_=2C_kredit_auf?=
	=?ISO-8859-1?Q?_haus_=2C_immobilienkredit_ohne_=2C_finanzierung_eines_hauses_=2C?=
Message-ID: <3b3b51d7-5963-4f78-b103-54ac7ce9f2ed@c16g2000yqd.googlegroups.com>

kredit haus , eigenheimzulage einkommensgrenzen , finanzamt
eigenheimzulage , kredit f?r haus kauf , kredit auf haus ,
immobilienkredit ohne , finanzierung eines hauses ,

+
+
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IMMOBILIEN +++
+
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http://WWW.IMMOBILIEN-KREDIT-ONLINE.NL
+
+
+
+

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finanzierung von immobilien hypotheken darlehen rechner
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eigenheimzulage vom staat hausfinanzierung im
hausfinanzierung ?sterreich anschlussfinanzierung hypothek
kredit f?r ein haus haus kaufen darlehen
deutsche kreditbank f?r baufinanzierung zins f?r baufinanzierung
immobilienkredit berechnung baufinanzierung lebensversicherung
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eigenheimzulage beantragen k?ndigung bauspardarlehen
g?nstige hypothekenkredite hypothekenkredit schweiz
zinsen hausfinanzierung baufinanzierung ohne eigenkapital
hartz iv eigenheimzulage eigenheimzulage 10e


From affdfsdfdsfsd at b.com  Wed Mar  3 12:38:19 2010
From: affdfsdfdsfsd at b.com (Tracubik)
Date: 03 Mar 2010 17:38:19 GMT
Subject: case do problem
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
	<hml77p$k1v$00$1@news.t-online.com>
Message-ID: <4b8e9e8b$0$1121$4fafbaef@reader3.news.tin.it>

Il Wed, 03 Mar 2010 09:39:54 +0100, Peter Otten ha scritto:

> Tracubik wrote:
> 
>> hi, i've to convert from Pascal this code:
> 
> program loop;
> 
> function generic_condition: boolean;
> begin
>    generic_condition := random > 0.7
> end;
> 
> procedure loop;
> var
>    iterations, count, m: integer;
> begin
>    iterations := 0;
>    count := 0;
>    m := 0;
>    repeat
>       iterations := iterations+1;
>       (*...*)
>       writeln(iterations:2, count:2, m:4);
>       (*...*)
>       if generic_condition then
> 	    inc(count);
>       (*...*)
>       case count of
> 	1: m := 1;
> 	2: m := 10;
> 	3: m := 100
>       end
>    until (count = 4) or (iterations = 20)
> end;
> 
> begin
>    loop;
>    writeln("That's all, folks")
> end.
> 
> Hey, I have a Pascal compiler just one apt-get away ;)
> 
> Here's how I'd translate the above, without trying to be too clever:
> 
> from random import random
> 
> def generic_condition():
>     return random() > 0.7
> 
> def loop():
>     count = 0
>     m = 0
>     lookup = {1: 1, 2: 10, 3: 100}
>     for iterations in range(20): # off by one
>         # ...
>         print "%2d %1d %3d" % (iterations, count, m) # ...
>         if generic_condition():
>             count += 1
>         # ...
>         m = lookup.get(count, m)
>         if count == 4:
>             break
> 
> if __name__ == "__main__":
>     loop()
>     print "That's all, folks"
> 
> Something must be wrong with me today because I find the Pascal code
> /more/ readable..

i was think the same, Pascal seem to generate a great more readable code. 
I'm a newbie, so my opinion is probably wrong, but i still think that 
don't have CASE OF and REPEAT UNTIL code block return in difficult-to-
read code.

> 
> Peter

Nico



From wanderer at dialup4less.com  Wed Mar  3 12:39:48 2010
From: wanderer at dialup4less.com (Wanderer)
Date: Wed, 3 Mar 2010 09:39:48 -0800 (PST)
Subject: Pylint Argument number differs from overridden method
Message-ID: <2484ca6e-0eb9-4e0c-a7db-d035badab711@t20g2000yqe.googlegroups.com>

Pylint W0221 gives the warning
Argument number differs from overridden method.

Why is this a problem? I'm overriding the method to add additional
functionality.

This
    def GetRays(self, angle, pt, lmbda = 0.6):
        """
        """

        angle, x, y, Rays, Power = self.ARefract(angle, pt[0], pt[1],
lmbda)
        pt1 = (x, y)

        return Rays, Power, angle, pt1


    def ARefract(self, angle, x, y, lmbda = 0.6):
        """
        """

        Nt = self.Mat.NtGet(lmbda)
        self.NtSet(Nt)
        angle, x, y, Rays, Power = self.Refract(angle, x, y)

        return angle, x, y, Rays, Power



Over rides this

    def GetRays(self, angle, pt):
        """
        """

        angle, x, y, Rays, Power = self.Refract(angle, pt[0], pt[1])
        pt1 = (x, y)

        return Rays, Power, angle, pt1


Thanks


From gandalf at shopzeus.com  Wed Mar  3 12:41:37 2010
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Wed, 03 Mar 2010 18:41:37 +0100
Subject: Instance factory - am I doing this right?
Message-ID: <4B8E9F51.1040203@shopzeus.com>

This is just an interesting code pattern that I have recently used:

class CacheStorage(object):
    """Generic cache storage class."""
    @classmethod
    def get_factory(cls,*args,**kwargs):
        """Create factory for a given set of cache storage creation 
parameters."""
        class CacheStorageFactory(cls):
            _construct_args = args
            _construct_kwargs = kwargs
            def __init__(self):
                cls.__init__(self,
                    *self._construct_args,**self._construct_kwargs)
        return CacheStorageFactory

Then, I can create subclasses like:

class GdbmCacheStorage(CacheStorage):
    """Gdbm cache storage class.
   
    @param basedir: Base directory where gdbm files should be stored.
    @param basename: Base name for logging and creating gdbm files.
    """
    def __init__(self,basedir,basename):
          ..... blablabla place initialization code here

class MemoryCacheStorage(CacheStorage):
    """In-Memory cache storage class.
   
    Please note that keys and values are always mashal-ed.
    E.g. when you cache an object, it makes a deep copy.
    """
    def __init__(self):
          ..... blablabla place initialization code here


And the finally, I can create a factory that can create cache storage 
instances for storing data in gdbm in a given directory:

cache_factory = GdbmCacheStorage.get_factory("~gandalf/db","test")
print cache_factory # <class '__main__.CacheStorageFactory'>
print cache_factory()

OR I can create a factory that can create instances for storing data in 
memory:


cache_factory = MemoryCacheStorage.get_factory()
print cache_factory # <class '__main__.CacheStorageFactory'>
print cache_factory() # <__main__.CacheStorageFactory object at 0x8250c6c>


Now, here is my question. Am I right in doing this? Or are there better 
language tools to be used in Python for the same thing? This whole thing 
about creating factories looks a bit odd for me. Is it Pythonic enough?

Thanks,

   Laszlo



From larudwer at freenet.de  Wed Mar  3 12:49:36 2010
From: larudwer at freenet.de (larudwer)
Date: Wed, 3 Mar 2010 18:49:36 +0100
Subject: Multiprocessing problem
References: <mailman.145.1267565451.23598.python-list@python.org>
Message-ID: <hmm6ks$89h$03$1@news.t-online.com>

Hello Matt

I think the problem is here:

        for n in xrange(100000):
            outqueue.put(str(n))        <-- fill the queue with 100000 
elements
            try:
                r = inqueue.get_nowait() <-- queue is still empty because 
processes need some time to start
                results.append(r)
            except Empty:
                pass <-- causing 100000 passes

....

        print "-"
        for task in tasks:
            outqueue.put(None)  <-- put even more data in the queue
...
# in the meantime the processes start to run and are trying to put data
# in to the output queue. However this queue might fill up, and lock
# all processes that try to write data in the already filled up queue

        print "joining"
        for task in tasks:
            task.join()            <-- can never succeed because processes 
are waiting for someone reading the result queue
        print "joined"

This example works:

from Queue import Empty, Full
from multiprocessing import Queue, Process
from base64 import b64encode
import time, random

class Worker(Process):
    def __init__(self, inqueue, outqueue):
        Process.__init__(self)
        self.inqueue = inqueue
        self.outqueue = outqueue

    def run(self):
        inqueue = self.inqueue
        outqueue = self.outqueue
        c = 0
        while True:
            arg = inqueue.get()
            if arg is None: break
            c += 1
            b = b64encode(arg)
            outqueue.put(b)

        # Clean-up code goes here
        outqueue.put(c)

class Supervisor(object):
    def __init__(self):
        pass

    def go(self):
        outqueue = Queue()
        inqueue = Queue()
        tasks = [Worker(outqueue, inqueue) for _ in xrange(4)]
        for task in tasks:
            task.start()

        results = []
        print "*"
        for n in xrange(100000):
            outqueue.put(str(n))

        print "-"
        for task in tasks:
            outqueue.put(None)

        print "emptying queue"
        try:
            while True:
                r = inqueue.get_nowait()
                results.append(r)
        except Empty:
            pass
        print "done"
        print len(results)

        print "joining"
        for task in tasks:
            task.join()
        print "joined"

if __name__ == "__main__":
    s = Supervisor()
    s.go()





From tim.wintle at teamrubber.com  Wed Mar  3 12:50:02 2010
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Wed, 03 Mar 2010 17:50:02 +0000
Subject: taking python enterprise level?...
In-Reply-To: <hmm2jc$28u$1@dough.gmane.org>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>
	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>
	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>
	<20100302015813.5397655e.darcy@druid.net>
	<hmm2jc$28u$1@dough.gmane.org>
Message-ID: <1267638602.988.19.camel@localhost>

On Wed, 2010-03-03 at 17:26 +0100, mk wrote:
> 
> So there *may* be some evidence that joins are indeed bad in
> practice. 
> If someone has smth specific/interesting on the subject, please post.

I have found joins to cause problems in a few cases - I'm talking about
relatively large tables though - roughly order 10^8 rows.

I'm on Mysql normally, but that shouldn't make any difference - I've
seen almost the same situation on Oracle

consider this simple example:

/*   Table A    */
CREATE TABLE TableA (
    project_id BIGINT NOT NULL,
    cost INT,
    date DATETIME,
    PRIMARY KEY (project_id, date)
);

/* Table projects */
CREATE TABLE projects (
    client_id BIGINT NOT NULL,
    project_id BIGINT NOT NULL,
    INDEX(client_id)
);


... now the index on TableA has been optimised for queries against date
ranges on specific project ids which should more or less be sequential
(under a load of other assumptions) - but that reduces the efficiency of
the query under a join with the table "projects".

If you denormalise the table, and update the first index to be on
(client_id, project_id, date) it can end up running far more quickly -
assuming you can access the first mapping anyway - so you're still
storing the first table, with stored procedures to ensure you still have
correct data in all tables.

I'm definitely glossing over the details - but I've definitely got
situations where I've had to choose denormalisation over purity of data.


Rolled-up data tables are other situations - where you know half your
queries are grouping by field "A" it's sometimes a requirement to store
that.


Tim





From mrkafk at gmail.com  Wed Mar  3 12:52:41 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 18:52:41 +0100
Subject: Docstrings considered too complicated
In-Reply-To: <20100303111248.7f40d659.darcy@druid.net>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>
	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>
	<4B8B9845.70604@sequans.com>	<mailman.59.1267456634.23598.python-list@python.org>	<7v695nFa0fU1@mid.individual.net>	<4B8E7538.2080003@mrabarnett.plus.com>
	<20100303111248.7f40d659.darcy@druid.net>
Message-ID: <hmm7l9$m4f$1@dough.gmane.org>

D'Arcy J.M. Cain wrote:

> Makes me want to go down to the basement and fire up the Altair.  :-)

Please don't, or else I fire up that univ Yugoslavian copy of VAX with 
Pascal compiler (where I wrote my first program) and I will start my 
first program of ping-pong.

It was a few hundred lines but took 5 minutes to compile; "VAX" was 
theoretically multitasking, but when more than 3 people were trying to 
do smth on it simultaneously, it was basically seizing up.

Regards,
mk



From e_d_k at yahoo.com  Wed Mar  3 13:01:27 2010
From: e_d_k at yahoo.com (Ed Keith)
Date: Wed, 3 Mar 2010 10:01:27 -0800 (PST)
Subject: Docstrings considered too complicated
In-Reply-To: <20100303114603.7021e9ba.darcy@druid.net>
Message-ID: <539252.91463.qm@web58904.mail.re1.yahoo.com>

--- On Wed, 3/3/10, D'Arcy J.M. Cain  wrote:

> They needed a way to tell where the end of the information
> was.? Why
> they used ^Z (SUB - Substitute) instead of ^C (ETX - End of
> TeXt) or
> even ^D (EOT - End Of Transmission) is anyone's guess.

That has always puzzled me to. ETX and EOT were well established, why no use one of them? I'd love to know what they were thinking.

   -EdK

Ed Keith
e_d_k at yahoo.com

Blog: edkeith.blogspot.com


 


      


From john at castleamber.com  Wed Mar  3 13:04:39 2010
From: john at castleamber.com (John Bokma)
Date: Wed, 03 Mar 2010 12:04:39 -0600
Subject: cpan for python?
References: <mailman.20.1267367545.23598.python-list@python.org>
	<hmjv4b$mqk$1@reader1.panix.com>
	<2010030214473616807-tomfsessile@gmailcom>
	<4b8ddea4$1@dnews.tpgi.com.au> <87ljea9f20.fsf@castleamber.com>
	<45b1599f-a05b-4132-9e75-89a52757e71b@q21g2000yqm.googlegroups.com>
Message-ID: <877hpt46yw.fsf@castleamber.com>

John Gabriele <jmg3000 at gmail.com> writes:

> On Mar 2, 11:58?pm, John Bokma <j... at castleamber.com> wrote:
>> Lie Ryan <lie.1... at gmail.com> writes:
>> > On 03/03/2010 09:47 AM, TomF wrote:
>>
>> [..]
>>
>> >> There
>> >> is also a program called cpan, distributed with Perl. ?It is used for
>> >> searching, downloading, installing and testing modules from the CPAN
>> >> repository. ?It's far more extensive than setuptools. ?AFAIK the python
>> >> community has developed nothing like it.
>>
>> > python have easy_install
>>
>> How easy is it to /remove/ something? ;-) (Last time I checked I read
>> something like "manually remove the .egg"...
>>
>
> Have a look at [pip](http://cheeseshop.python.org/pypi/pip). It should
> support uninstalling packages.

Thanks John. However:

  "Known exceptions include pure-distutils packages installed with
  python setup.py install"

I want to remove something that I installed that way (because it's
installation procedure seems to be broken; opensocial) I understand that
this can't be blamed on pip, but it's odd that in this century it's
still hard to install/uninstall modules :-(

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From steve at holdenweb.com  Wed Mar  3 13:14:18 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 03 Mar 2010 13:14:18 -0500
Subject: taking python enterprise level?...
In-Reply-To: <hmm2jc$28u$1@dough.gmane.org>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>	<20100302015813.5397655e.darcy@druid.net>
	<hmm2jc$28u$1@dough.gmane.org>
Message-ID: <hmm8tv$qb9$1@dough.gmane.org>

mk wrote:
> D'Arcy J.M. Cain wrote:
>> I keep seeing this statement but nothing to back it up.  I have created
>> many apps that run on Python with a PostgreSQL database with a fully
>> normalized schema and I can assure you that database joins were never
>> my problem unless I made a badly constructed query or left off a
>> critical index.
> 
> I too have done that (Python/PGSQL), even adding a complicated layer of
> SQLAlchemy on top of it and have not had issue with this: when I
> profiled one of my apps, it turned out that it spent most of its
> computation time... rendering HTML. Completely unexpected: I expected DB
> to be bottleneck (although it might be that with huge datasets this
> might change).
> 
> Having said that, re evidence that joins are bad: from what I've *heard*
> about Hibernate in Java from people who used it (I haven't used
> Hibernate apart from "hello world"), in case of complicated object
> hierarchies it supposedly generates a lot of JOINs and that supposedly
> kills DB performance.
> 
> So there *may* be some evidence that joins are indeed bad in practice.
> If someone has smth specific/interesting on the subject, please post.
> 
I suspect that this myth is propagated from the distributed database
world: joining tables across two different servers can indeed be
problematic from a performance point of view.

However, the classic advice in database design is to start with a
normalized design and then vary it only if you need to for performance
reasons (which will also involve taking a hit on the coding side,
especially if updates are involved).

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From python at mrabarnett.plus.com  Wed Mar  3 13:15:14 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 03 Mar 2010 18:15:14 +0000
Subject: Docstrings considered too complicated
In-Reply-To: <20100303114603.7021e9ba.darcy@druid.net>
References: <20100224212303.242222c6@geekmail.INVALID>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>
	<kyoevn.k63@spenarnc.xs4all.nl>	<hmk60h$nce$1@reader1.panix.com>
	<7v69rcFcmeU1@mid.individual.net>	<hmltsi$jcd$1@reader1.panix.com>
	<20100303114603.7021e9ba.darcy@druid.net>
Message-ID: <4B8EA732.60408@mrabarnett.plus.com>

D'Arcy J.M. Cain wrote:
> On Wed, 3 Mar 2010 15:05:54 +0000 (UTC)
> Grant Edwards <invalid at invalid.invalid> wrote:
>>> It was actually an improvement over CP/M's file
>>> system. CP/M didn't have hierarchical directories
>> Neither did the original MS-DOS filesystem.
> 
> I think that it always had a hierarchical file system although I am not
> sure about 86-DOS or QDOS on which is was based.
> 
[snip]

MS-DOS had a hierarchical file system from version 2.0.



From mrkafk at gmail.com  Wed Mar  3 13:20:00 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 19:20:00 +0100
Subject: Sort Big File Help
In-Reply-To: <374400.23537.qm@web33805.mail.mud.yahoo.com>
References: <374400.23537.qm@web33805.mail.mud.yahoo.com>
Message-ID: <hmm98g$sdk$1@dough.gmane.org>

John Filben wrote:
> I am new to Python but have used many other (mostly dead) languages in 
> the past.  I want to be able to process *.txt and *.csv files.  I can 
> now read that and then change them as needed ? mostly just take a column 
> and do some if-then to create a new variable.  My problem is sorting 
> these files:
> 
> 1.)    How do I sort file1.txt by position and write out 
> file1_sorted.txt; for example, if all the records are 100 bytes long and 
> there is a three digit id in the position 0-2; here would be some sample 
> data:
> 
> a.       001JohnFilben??
> 
> b.      002Joe  Smith?..

Use a dictionary:

linedict = {}
for line in f:
	key = line[:3]
	linedict[key] = line[3:] # or alternatively 'line' if you want to 
include key in the line anyway

sortedlines = []
for key in linedict.keys().sort():
	sortedlines.append(linedict[key])

(untested)

This is the simplest, and probably inefficient approach. But it should work.

> 
> 2.)    How do I sort file1.csv by column name; for example, if all the 
> records have three column headings, ?id?, ?first_name?, ?last_name?; 
>  here would be some sample data:
> 
> a.       Id, first_name,last_name
> 
> b.      001,John,Filben
> 
> c.       002,Joe, Smith

This is more complicated: I would make a list of lines, where each line 
is a list split according to columns (like ['001', 'John', 'Filben']), 
and then I would sort this list using operator.itemgetter, like this:

lines.sort(key = operator.itemgetter(num)) # where num is the number of 
column, starting with 0 of course

Read up on operator.*, it's very useful.


> 
> 3.)    What about if I have millions of records and I am processing on a 
> laptop with a large external drive ? basically, are there space 
> considerations? What are the work arounds.

The simplest is to use smth like SQLite: define a table, fill it up, and 
then do SELECT with ORDER BY.

But with a million records I wouldn't worry about it, it should fit in 
RAM. Observe:

 >>> a={}
 >>> for i in range(1000000):
...     a[i] = 'spam'*10
...
 >>> sys.getsizeof(a)
25165960

So that's what, 25 MB?

Although I have to note that TEMPORARY ram usage in Python process on my 
machine did go up to 113MB.

Regards,
mk






From detlev at die-offenbachs.de  Wed Mar  3 13:23:16 2010
From: detlev at die-offenbachs.de (Detlev Offenbach)
Date: Wed, 03 Mar 2010 19:23:16 +0100
Subject: Eric4 vs Python3.1
References: <mailman.206.1267634539.23598.python-list@python.org>
Message-ID: <hmm9ek$2vj$1@online.de>

Zhu Sha Zang wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Someone using Eric4 to program with Python3/3.1?
> 
> What can i do, because he insist to use only Python2.6.4.

You can tell it the file extension to use for Python3 files or better yet 
use eric5, which is the Python3 port of eric4 with enhancements.

Detlev

> 
> Att
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v2.0.14 (GNU/Linux)
> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/
> 
> iEYEARECAAYFAkuOZO4ACgkQ35zeJy7JhCjdFACfZrjVa+8O9fu/7FEPr6mVeaEg
> Rm0AmgM+XtuxFH1zUnfkaphF+MgPy3pf
> =MVeJ
> -----END PGP SIGNATURE-----

-- 
Detlev Offenbach
detlev at die-offenbachs.de


From R.Brodie at rl.ac.uk  Wed Mar  3 13:29:06 2010
From: R.Brodie at rl.ac.uk (Richard Brodie)
Date: Wed, 3 Mar 2010 18:29:06 -0000
Subject: Docstrings considered too complicated
References: <mailman.215.1267639293.23598.python-list@python.org>
Message-ID: <hmm9pi$num$1@south.jnrs.ja.net>


"Ed Keith" <e_d_k at yahoo.com> wrote in message 
news:mailman.215.1267639293.23598.python-list at python.org...


> That has always puzzled me to. ETX and EOT were well established,
> why no use one of them? I'd love to know what they were thinking.

It goes back to ancient PDP operating systems, so may well
predate Unix, depending which exact OS was the first to use it.







From python at mrabarnett.plus.com  Wed Mar  3 13:34:51 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 03 Mar 2010 18:34:51 +0000
Subject: Docstrings considered too complicated
In-Reply-To: <20100303111248.7f40d659.darcy@druid.net>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>	<4B8B9845.70604@sequans.com>	<mailman.59.1267456634.23598.python-list@python.org>	<7v695nFa0fU1@mid.individual.net>	<4B8E7538.2080003@mrabarnett.plus.com>
	<20100303111248.7f40d659.darcy@druid.net>
Message-ID: <4B8EABCB.6050303@mrabarnett.plus.com>

D'Arcy J.M. Cain wrote:
> On Wed, 03 Mar 2010 14:42:00 +0000
> MRAB <python at mrabarnett.plus.com> wrote:
>> Gregory Ewing wrote:
>> Mk14 from Science of Cambridge, a kit with hex keypad and 7-segment
>> display, which I had to solder together, and also make my own power
>> supply. I had the extra RAM and the I/O chip, so that's 256B (including
>> the memory used by the monitor) + 256B additional RAM + 128B more in the
>> I/O chip.
> 
> In case some of you youngsters think that there is a typo in the above,
> no, he means a total of 640 bytes.  In today's terms that would be
> approx 0.0000006GB.
> 
> Makes me want to go down to the basement and fire up the Altair.  :-)
> 
There was partial address decoding, so the blocks appeared at several
different places in the address space, the blocks weren't contiguous
(normal RAM at 0xFxx, extra at 0xBxx), and the external address bus was
12 bits.

Not only that, I discovered that one of the bits in the extra RAM
was faulty - stuck at 0 (or was it 1)?

But I was still able to play Nim and Duck Shoot (after keying it in)!
:-)


From mrkafk at gmail.com  Wed Mar  3 13:47:14 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 19:47:14 +0100
Subject: memory usage, temporary and otherwise
Message-ID: <hmmari$2r4$1@dough.gmane.org>


Obviously, don't try this on low-memory machine:

 >>> a={}
 >>> for i in range(10000000):
...     a[i]='spam'*10
...
 >>> import sys
 >>> sys.getsizeof(a)
201326728
 >>> id(a[1])
3085643936L
 >>> id(a[100])
3085713568L

 >>> ids={}
 >>> for i in range(len(a)):
...     ids[id(a[i])]=True
...
 >>> len(ids.keys())
10000000

Hm, apparently Python didn't spot that 'spam'*10 in a's values is really 
the same string, right?

So sys.getsizeof returns some 200MB for this dictionary. But according 
to top RSS of the python process is 300MB. ps auxw says the same thing 
(more or less).

Why the 50% overhead? (and I would swear that a couple of times RSS 
according to top grew to 800MB).

Regards,
mk





From alfps at start.no  Wed Mar  3 13:51:23 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 03 Mar 2010 19:51:23 +0100
Subject: Sample code usable Tkinter listbox
In-Reply-To: <hmf1qo$v9v$1@news.eternal-september.org>
References: <hmf1qo$v9v$1@news.eternal-september.org>
Message-ID: <hmmb3d$fij$1@news.eternal-september.org>

* Alf P. Steinbach:
> In case Someone Else(TM) may need this.
> 
> This code is just how it currently looks, what I needed for my code, so 
> it's not a full-fledged or even tested class.
> 
> But it works.


That code evolved a little to cover more Tk listbox quirks (thanks to Ratingrick 
for the "activestyle"):


<code>
class UsableListbox( t.Frame ):
     def __init__( self, parent_widget ):
         t.Frame.__init__( self, parent_widget )
         scrollbar = t.Scrollbar( self, orient = "vertical" )
         self.lb = t.Listbox(
             self,
             exportselection = 0, activestyle = "none", selectmode = "browse",
             yscrollcommand = scrollbar.set
             )
         scrollbar.config( command = self.lb.yview )
         scrollbar.pack( side = "right", fill = "y" )
         self.lb.pack( side = "left", fill = "both", expand = 1 )

     def current_index( self ):
         indices = self.lb.curselection()
         assert( len( indices ) <= 1 )       # TODO: about multi-selection.
         return None if len( indices ) == 0 else int( indices[0] )

     def item_at( self, i ):
         assert( 0 <= i < self.item_count() )
         return "" if i is None else self.lb.get( i )

     def current( self ):
         #return self.lb.get( "active" )     # Incorrect with mousing
         return self.item_at( self.current_index() )

     def item_count( self ):
         return self.lb.size()

     def clear( self ):
         self.lb.delete( 0, "end" )

     def append( self, item ):
         self.lb.insert( "end", item )
         return self.item_count() - 1

     def scroll_into_view( self, i ):
         self.lb.see( i )

     def select_item( self, i ):
         assert( 0 <= i < self.item_count() )
         old_i = self.current_index();
         self.scroll_into_view( i )
         if old_i is not None and old_i == i:
             return
         self.lb.selection_set( i )
         if old_i is not None:
             self.lb.selection_clear( old_i )

     def add_selection_event_handler( self, handler ):
         "An event handler takes one argument, a Tkinter Event"
         return self.lb.bind( "<<ListboxSelect>>", handler )
</code>


Cheers,

- Alf


From robert.kern at gmail.com  Wed Mar  3 13:51:34 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 03 Mar 2010 12:51:34 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <hmm5ln$arg$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>
	<hmm5ln$arg$1@news.eternal-september.org>
Message-ID: <hmmb3n$3p0$1@dough.gmane.org>

On 2010-03-03 11:18 AM, Alf P. Steinbach wrote:
> * Robert Kern:
>> On 2010-03-03 09:56 AM, Alf P. Steinbach wrote:
>>> * Mike Kent:
>>>> What's the compelling use case for this vs. a simple try/finally?
>>>
>>> if you thought about it you would mean a simple "try/else". "finally" is
>>> always executed. which is incorrect for cleanup
>>
>> Eh? Failed execution doesn't require cleanup? The example you gave is
>> definitely equivalent to the try: finally: that Mike posted.
>
> Sorry, that's incorrect: it's not.
>
> With correct code (mine) cleanup for action A is only performed when
> action A succeeds.
>
> With incorrect code cleanup for action A is performed when A fails.

Oh?

$ cat cleanup.py

class Cleanup:
     def __init__( self ):
         self._actions = []

     def call( self, action ):
         assert( callable( action ) )
         self._actions.append( action )

     def __enter__( self ):
         return self

     def __exit__( self, x_type, x_value, x_traceback ):
         while( len( self._actions ) != 0 ):
             try:
                 self._actions.pop()()
             except BaseException as x:
                 raise AssertionError( "Cleanup: exception during cleanup" )

def print_(x):
     print x

with Cleanup() as at_cleanup:
     at_cleanup.call(lambda: print_("Cleanup executed without an exception."))

with Cleanup() as at_cleanup:
     at_cleanup.call(lambda: print_("Cleanup execute with an exception."))
     raise RuntimeError()

$ python cleanup.py
Cleanup executed without an exception.
Cleanup execute with an exception.
Traceback (most recent call last):
   File "cleanup.py", line 28, in <module>
     raise RuntimeError()
RuntimeError

>> The actions are always executed in your example,
>
> Sorry, that's incorrect.

Looks like it to me.

>> From your post, the scope guard technique is used "to ensure some
>> desired cleanup at the end of a scope, even when the scope is exited
>> via an exception." This is precisely what the try: finally: syntax is
>> for.
>
> You'd have to nest it. That's ugly. And more importantly, now two people
> in this thread (namely you and Mike) have demonstrated that they do not
> grok the try functionality and manage to write incorrect code, even
> arguing that it's correct when informed that it's not, so it's a pretty
> fragile construct, like goto.

Uh-huh.

>> The with statement allows you to encapsulate repetitive boilerplate
>> into context managers, but a general purpose context manager like your
>> Cleanup class doesn't take advantage of this.
>
> I'm sorry but that's pretty meaningless. It's like: "A house allows you
> to encapsulate a lot of stinking garbage, but your house doesn't take
> advantage of that, it's disgustingly clean". Hello.

No, I'm saying that your Cleanup class is about as ugly as the try: finally:. It 
just shifts the ugliness around. There is a way to use the with statement to 
make things look better and more readable in certain situations, namely where 
there is some boilerplate that you would otherwise repeat in many places using 
try: finally:. You can encapsulate that repetitive code into a class or a 
@contextmanager generator and just call the contextmanager. A generic context 
manager where you register callables doesn't replace any boilerplate. You still 
repeat all of the cleanup code everywhere. What's more, because you have to 
shove everything into a callable, you have significantly less flexibility than 
the try: finally:.

I will admit that you can put the cleanup code closer to the code that needs to 
get cleaned up, but you pay a price for that.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From mrkafk at gmail.com  Wed Mar  3 13:54:52 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 19:54:52 +0100
Subject: Generic singleton
Message-ID: <hmmb9t$4d6$1@dough.gmane.org>

Hello,

So I set out to write generic singleton, i.e. the one that would do a 
singleton with attributes of specified class. At first:

class Singleton(object):

     instance = None

     def __new__(cls, impclass, *args, **kwargs):
         if cls.instance is None:
             cls.instance = impclass.__new__(impclass, *args, **kwargs)
         return cls.instance

s1 = Singleton(dict)
s2 = Singleton(dict)

s1['spam']='wonderful'

print s1, s2
print id(s1) == id(s2)


Now, this works. But this obviously doesn't allow class of singleton to 
be changed, or a new singleton for another class to be created. So:


class Singleton(object):

     instd = {}

     def __new__(cls, impclass, *args, **kwargs):
         impid = id(impclass)
         if not cls.instd.has_key(impid):
             cls.instd[impid] = impclass.__new__(impclass, *args, **kwargs)
         return cls.instd[impid]

s1 = Singleton(dict)
s2 = Singleton(dict)
s1['spam']='wonderful'


s3 = Singleton(list)
s4 = Singleton(list)
s3.append('eggs')

print id(s1) == id(s2)
print id(s3) == id(s4)

print s1, s2, s3, s4


Questions:

1. Is this safe? That is, does every builtin class have unique id? I 
have found this in docs:

hashable
..
     All of Python?s immutable built-in objects are hashable, while no 
mutable containers (such as lists or dictionaries) are.

Well ok, hashable they're not; but apparently at least dict and list 
have id()?

 >>> id(list)
135709728
 >>> id(dict)
135714560
 >>> id(dict)
135714560
 >>> c=dict
 >>> id(c)
135714560


2. Drawbacks?

3. Better/fancier way to do this?

Regards,
mk





From python at mrabarnett.plus.com  Wed Mar  3 14:09:18 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 03 Mar 2010 19:09:18 +0000
Subject: NoSQL Movement?
In-Reply-To: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
Message-ID: <4B8EB3DE.8070003@mrabarnett.plus.com>

Xah Lee wrote:
> recently i wrote a blog article on The NoSQL Movement
> at http://xahlee.org/comp/nosql.html
> 
> i'd like to post it somewhere public to solicit opinions, but in the
> 20 min or so, i couldn't find a proper newsgroup, nor private list
> that my somewhat anti-NoSQL Movement article is fitting.
> 
> So, i thought i'd post here to solicit some opinins from the programer
> community i know.
> 
[snip]
Couldn't find a relevant newsgroup, so decided to inflict it on a number
of others...


From philip at semanchuk.com  Wed Mar  3 14:15:26 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Wed, 3 Mar 2010 14:15:26 -0500
Subject: taking python enterprise level?...
In-Reply-To: <hmm2jc$28u$1@dough.gmane.org>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>
	<20100302015813.5397655e.darcy@druid.net>
	<hmm2jc$28u$1@dough.gmane.org>
Message-ID: <973824D8-3020-44A8-B2DA-501FF530457B@semanchuk.com>


On Mar 3, 2010, at 11:26 AM, mk wrote:

> D'Arcy J.M. Cain wrote:
>> I keep seeing this statement but nothing to back it up.  I have  
>> created
>> many apps that run on Python with a PostgreSQL database with a fully
>> normalized schema and I can assure you that database joins were never
>> my problem unless I made a badly constructed query or left off a
>> critical index.
>
> I too have done that (Python/PGSQL), even adding a complicated layer  
> of SQLAlchemy on top of it and have not had issue with this: when I  
> profiled one of my apps, it turned out that it spent most of its  
> computation time... rendering HTML. Completely unexpected: I  
> expected DB to be bottleneck (although it might be that with huge  
> datasets this might change).
>
> Having said that, re evidence that joins are bad: from what I've  
> *heard* about Hibernate in Java from people who used it (I haven't  
> used Hibernate apart from "hello world"), in case of complicated  
> object hierarchies it supposedly generates a lot of JOINs and that  
> supposedly kills DB performance.
>
> So there *may* be some evidence that joins are indeed bad in  
> practice. If someone has smth specific/interesting on the subject,  
> please post.

It's an unprovable assertion, or a meaningless one depending on how  
one defines the terms. You could also say "there *may* be some  
evidence that Python lists are bad in practice". Python lists and SQL  
JOINs are like any part of a language or toolkit. They're good tools  
for solving certain classes of problems. They can also be misapplied  
to problems that they're not so good at. Sometimes they're a  
performance bottleneck, even when solving the problems for which  
they're best. Sometimes the best way to solve a performance bottleneck  
is to redesign your app/system so you don't need to solve that kind of  
problem anymore (hence the join-less databases). Other times, the cure  
is worse than the disease and you're better off throwing hardware at  
the problem.

My $.02
Philip






From mrkafk at gmail.com  Wed Mar  3 14:21:29 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 20:21:29 +0100
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <7071cfa0-0485-4192-b3ee-8e12d9f1fca2@f17g2000prh.googlegroups.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<mailman.64.1267463648.23598.python-list@python.org>	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>	<7xljebyl56.fsf@ruckus.brouhaha.com>	<mailman.70.1267468806.23598.python-list@python.org>
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>	<7x635fdcth.fsf@ruckus.brouhaha.com>	<mailman.199.1267631220.23598.python-list@python.org>
	<7071cfa0-0485-4192-b3ee-8e12d9f1fca2@f17g2000prh.googlegroups.com>
Message-ID: <hmmcrq$bi0$1@dough.gmane.org>

Steve Howell wrote:
> Somewhere in the 2020s, though, I predict that a lot of technologies
> are either going to finally die off, or at least be restricted to the
> niches that they serve well.  Take Java, for example.  I think it will
> be still be used, and people will still even be writing new programs
> in it, but it will be rightly scorned in a lot of places where it is
> now embraced.  Some of this won't actually be due to technological
> advances, but just changes in perception.  For example, I predict lots
> of programs that people now write in Java will be written in Python,
> even if the core language of Python remains fairly stable.

A friend of mine, and a good Java programmer, says caustically: "Java is 
COBOL of the future".

Where I work we develop a huge application in Websphere (IBM Java-based 
application server). The problems with legacy code made project manager 
joke "perhaps we should rewrite this in Python". Perhaps some day it 
will not be a joke anymore?

Personally, I chose to stay away from Java, even though it would 
temporarily help me: the amount of time & effort it takes to master the 
necessary toolset is *huge*, and my scarce time is better spent 
elsewhere, on more productive tools, and I really, really do not want 
lots of my limited time to go down the drain in a few years.

Take EJB for example: even its creators realized they've overdone it 
with EJB 2 and simplified somewhat EJB 3 and switched to annotations 
instead of gazillion XML formats. But still I dread the thought of 
having to spend so much time learning it before I can do a few lines of 
productive work in it.

In a way it's horrible: all this gargantuan effort in a few years will 
be completely wasted, down the drain. All those developer hours and 
dollars wasted.. In a way, C wasn't as bad as Java has been: at least 
many of C libs, with new bindings, still live on and do work.

> Going back to Paul's statement, I agree that "there should be one and
> only one obvious way to do it" in Python, but I don't think the
> philosophy applies to the greater ecosystem of software development.

+1

Note that when it comes to bigger tools or frameworks, even in the world 
of Python things are not "one obvious way", e.g. Django for quick and 
dirty and small apps, and Pylons for big and powerful apps. There may be 
"one obvious way to do it" in a very, very narrow context, but when 
contexts widen, like, say: "what is web framework I should choose?" the 
answers diverge, because answer has to be variation of "it depends on 
your situation".

> Whether RSON is really an improvement or not is an orthogonal issue to
> whether we should strive for improvement.

+1

Regards,
mk



From alfps at start.no  Wed Mar  3 14:32:25 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 03 Mar 2010 20:32:25 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.221.1267642316.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>
	<mailman.221.1267642316.23598.python-list@python.org>
Message-ID: <hmmdgd$17s$1@news.eternal-september.org>

* Robert Kern:
> On 2010-03-03 11:18 AM, Alf P. Steinbach wrote:
>> * Robert Kern:
>>> On 2010-03-03 09:56 AM, Alf P. Steinbach wrote:
>>>> * Mike Kent:
>>>>> What's the compelling use case for this vs. a simple try/finally?
>>>>
>>>> if you thought about it you would mean a simple "try/else". 
>>>> "finally" is
>>>> always executed. which is incorrect for cleanup
>>>
>>> Eh? Failed execution doesn't require cleanup? The example you gave is
>>> definitely equivalent to the try: finally: that Mike posted.
>>
>> Sorry, that's incorrect: it's not.
>>
>> With correct code (mine) cleanup for action A is only performed when
>> action A succeeds.
>>
>> With incorrect code cleanup for action A is performed when A fails.
> 
> Oh?
> 
> $ cat cleanup.py
> 
> class Cleanup:
>     def __init__( self ):
>         self._actions = []
> 
>     def call( self, action ):
>         assert( callable( action ) )
>         self._actions.append( action )
> 
>     def __enter__( self ):
>         return self
> 
>     def __exit__( self, x_type, x_value, x_traceback ):
>         while( len( self._actions ) != 0 ):
>             try:
>                 self._actions.pop()()
>             except BaseException as x:
>                 raise AssertionError( "Cleanup: exception during cleanup" )
> 
> def print_(x):
>     print x
> 
> with Cleanup() as at_cleanup:
>     at_cleanup.call(lambda: print_("Cleanup executed without an 
> exception."))
> 
> with Cleanup() as at_cleanup:

*Here* is where you should

   1) Perform the action for which cleanup is needed.

   2) Let it fail by raising an exception.


>     at_cleanup.call(lambda: print_("Cleanup execute with an exception."))
>     raise RuntimeError()

With an exception raised here cleanup should of course be performed.

And just in case you didn't notice: the above is not a test of the example I gave.


> $ python cleanup.py
> Cleanup executed without an exception.
> Cleanup execute with an exception.
> Traceback (most recent call last):
>   File "cleanup.py", line 28, in <module>
>     raise RuntimeError()
> RuntimeError
> 
>>> The actions are always executed in your example,
>>
>> Sorry, that's incorrect.
> 
> Looks like it to me.

I'm sorry, but you're

  1) not testing my example which you're claiming that you're testing, and

  2) not even showing anything about your earlier statements, which were
     just incorrect.

You're instead showing that my code works as it should for the case that you're 
testing, which is a bit unnecessary since I knew that, but thanks anyway.

I'm not sure what that shows, except that you haven't grokked this yet.


>>> From your post, the scope guard technique is used "to ensure some
>>> desired cleanup at the end of a scope, even when the scope is exited
>>> via an exception." This is precisely what the try: finally: syntax is
>>> for.
>>
>> You'd have to nest it. That's ugly. And more importantly, now two people
>> in this thread (namely you and Mike) have demonstrated that they do not
>> grok the try functionality and manage to write incorrect code, even
>> arguing that it's correct when informed that it's not, so it's a pretty
>> fragile construct, like goto.
> 
> Uh-huh.

Yeah. Consider that you're now for the third time failing to grasp the concept 
of cleanup for a successful operation.


>>> The with statement allows you to encapsulate repetitive boilerplate
>>> into context managers, but a general purpose context manager like your
>>> Cleanup class doesn't take advantage of this.
>>
>> I'm sorry but that's pretty meaningless. It's like: "A house allows you
>> to encapsulate a lot of stinking garbage, but your house doesn't take
>> advantage of that, it's disgustingly clean". Hello.
> 
> No, I'm saying that your Cleanup class is about as ugly as the try: 
> finally:. It just shifts the ugliness around. There is a way to use the 
> with statement to make things look better and more readable in certain 
> situations, namely where there is some boilerplate that you would 
> otherwise repeat in many places using try: finally:. You can encapsulate 
> that repetitive code into a class or a @contextmanager generator and 
> just call the contextmanager. A generic context manager where you 
> register callables doesn't replace any boilerplate. You still repeat all 
> of the cleanup code everywhere. What's more, because you have to shove 
> everything into a callable, you have significantly less flexibility than 
> the try: finally:.

Sorry, but that's meaningless again. You're repeating that my house has no 
garbage in it. And you complain that it would be work to add garbage to it. Why 
do you want that garbage? I think it's nice without it!


> I will admit that you can put the cleanup code closer to the code that 
> needs to get cleaned up, but you pay a price for that.

Yes, that's an additional point, and important. I forgot to mention it. Thanks!


Cheers & hth.,

- Alf


From bthate at gmail.com  Wed Mar  3 14:33:02 2010
From: bthate at gmail.com (Bart Thate)
Date: Wed, 3 Mar 2010 11:33:02 -0800 (PST)
Subject: GZRBOT 0.2 BETA1 released
Message-ID: <9e26a4b7-cec6-4f73-bcd2-5fe95aa8647c@y17g2000yqd.googlegroups.com>

Hello World !

Welcome to the world of Active API ;]

Google released their new Wave API so i quickly ported GZRBOT to the
new API. Now we can finally push to waves instead of using polling.
This makes pushing feeds to waves possible, and this is one of the
main things GZRBOT can do. We now use pubsubhubbub service provided by
superfeedr.com to fetch our RSS and Atom feeds for us and have them
pushed to the bot, which we then forward to the waves that have been
subscribed ( or jabber clients for that matter)

This release is BETA1 which doesnt mean the code is fixed yet as
BETA2,3,4 and RC1, 2, 3 etc are still ahead before 0.2 is released. So
this is kind of bleeding edge and you might want to wait for 0.2.1 or
so ;]

If you like to play around with wave/jabber bots on GAE then this is
the bot for you.

Code is at the mercurial repo:

hg clone http://gzrbot.googlecode.com/hg

Or download the tarball at http://gzrbot.googlecode.com

Basic documentation is at http://gozerbot.org/gzrdoc and i made a wave
available if you want to try the bot with me or have questions and
such:

https://wave.google.com/wave/#restored:wave:googlewave.com!w%252B51rssVscD

Hope you enjoy it !

Bart


about GZRBOT:

GZRBOT is a general purpose bot for wave, web and xmpp. It uses a
plugin
structure to provide easy programming of commands and callbacks,
allowing
you to implement your own "killer plugin".

GZRBOT comes with some plugins provided, for example:

- Hubbub plugin that uses superfeedr.com to get RSS feed pushed
instead of
pulling them ourselves. This lowers the load on the bot considerably.
A
max of 1000 feeds is for free.

- Watcher plugin that let you watch waves, get notified in jabber when
your
waves updates. (the bots sends the updated txt)

- Wave plugin that provides help with wave management. I'm working
on wave cloning after say x blips, so that larger conversations can be
created in google wave. UNDER DEVELOPMENT

- This is mostly needed for the last plugin i want to mention and that
is
the gozernet plugin. The plugin allows for relaying of events between
GZRBOT (Wave/Web/XMPP) and GOZERBOT (IRC/Jabber). IRC and Wave can be
bridged this way. UNDER DEVELOPMENT

GZRBOT is free code (BSD) and can be cloned as needed ;]

note: as of 0.2 GZRBOT uses the new v2 Wave API and thus needs
registration with google.


From robert.kern at gmail.com  Wed Mar  3 14:33:43 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 03 Mar 2010 13:33:43 -0600
Subject: Pylint Argument number differs from overridden method
In-Reply-To: <2484ca6e-0eb9-4e0c-a7db-d035badab711@t20g2000yqe.googlegroups.com>
References: <2484ca6e-0eb9-4e0c-a7db-d035badab711@t20g2000yqe.googlegroups.com>
Message-ID: <hmmdin$dns$1@dough.gmane.org>

On 2010-03-03 11:39 AM, Wanderer wrote:
> Pylint W0221 gives the warning
> Argument number differs from overridden method.
>
> Why is this a problem? I'm overriding the method to add additional
> functionality.

There are exceptions to every guideline. Doing this could easily be a mistake, 
so it's one of the many things that Pylint checks for. Silence the warning if 
you like.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From stefan_ml at behnel.de  Wed Mar  3 14:35:01 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 03 Mar 2010 20:35:01 +0100
Subject: SOAP 1.2 Python client ?
In-Reply-To: <5a36bd30-6cbd-48ca-9ca3-dc34c97e03c0@o30g2000yqb.googlegroups.com>
References: <5a36bd30-6cbd-48ca-9ca3-dc34c97e03c0@o30g2000yqb.googlegroups.com>
Message-ID: <hmmdl5$ekd$1@dough.gmane.org>

BlueBird, 03.03.2010 17:32:
> I am looking for a SOAP 1.2 python client. To my surprise, it seems
> that this does not exist. Does anybody know about this ?

SOAP may be an overly bloated protocol, but it's certainly not black magic. 
It's not hard to do manually if you really need to:

http://effbot.org/zone/element-soap.htm

Stefan



From steve at holdenweb.com  Wed Mar  3 14:38:16 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 03 Mar 2010 14:38:16 -0500
Subject: Docstrings considered too complicated
In-Reply-To: <hmm7l9$m4f$1@dough.gmane.org>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>	<4B8B9845.70604@sequans.com>	<mailman.59.1267456634.23598.python-list@python.org>	<7v695nFa0fU1@mid.individual.net>	<4B8E7538.2080003@mrabarnett.plus.com>	<20100303111248.7f40d659.darcy@druid.net>
	<hmm7l9$m4f$1@dough.gmane.org>
Message-ID: <hmmdrf$fco$1@dough.gmane.org>

mk wrote:
> D'Arcy J.M. Cain wrote:
> 
>> Makes me want to go down to the basement and fire up the Altair.  :-)
> 
> Please don't, or else I fire up that univ Yugoslavian copy of VAX with
> Pascal compiler (where I wrote my first program) and I will start my
> first program of ping-pong.
> 
> It was a few hundred lines but took 5 minutes to compile; "VAX" was
> theoretically multitasking, but when more than 3 people were trying to
> do smth on it simultaneously, it was basically seizing up.
> 
> Regards,
> mk
> 
Puts me in mind of Mario Wolczko's early attempts to implement SmallTalk
on a VAX 11/750. The only bitmapped display we had available was a Three
Rivers PERQ, connected by a 9600bps serial line. We left it running at
seven o'clock one evening, and by nine am the next day it had brought up
about two thirds of the initial VM loader screen ...

You tell these young kids, and they just don't believe you!

regards
 Steve

-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From mrkafk at gmail.com  Wed Mar  3 14:39:35 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 20:39:35 +0100
Subject: taking python enterprise level?...
In-Reply-To: <1267638602.988.19.camel@localhost>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>	<20100302015813.5397655e.darcy@druid.net>	<hmm2jc$28u$1@dough.gmane.org>
	<1267638602.988.19.camel@localhost>
Message-ID: <hmmdtn$fkn$1@dough.gmane.org>

Hello Tim,

Pardon the questions but I haven't had the need to use denormalization 
yet, so:

Tim Wintle wrote:

> /*   Table A    */
> CREATE TABLE TableA (
>     project_id BIGINT NOT NULL,
>     cost INT,
>     date DATETIME,
>     PRIMARY KEY (project_id, date)
> );
> 
> /* Table projects */
> CREATE TABLE projects (
>     client_id BIGINT NOT NULL,
>     project_id BIGINT NOT NULL,
>     INDEX(client_id)
> );
> 
> 
> .... now the index on TableA has been optimised for queries against date
> ranges on specific project ids which should more or less be sequential
> (under a load of other assumptions) - but that reduces the efficiency of
> the query under a join with the table "projects".
> 
> If you denormalise the table, and update the first index to be on
> (client_id, project_id, date) it can end up running far more quickly -

IOW you basically merged the tables like follows?

CREATE TABLE projects (
     client_id BIGINT NOT NULL,
     project_id BIGINT NOT NULL,
     cost INT,
     date DATETIME,
     INDEX(client_id, project_id, date)
);

 From what you write further in the mail I conclude that you have not 
eliminated the first table, just made table projects look like I wrote 
above, right? (and used stored procedures to make sure that both tables 
contain the relevant data for client_id and project_id columns in both 
tables)

Have you had some other joins on denormalized keys? i.e. in example how 
the join of hypothetical TableB with projects on projects.client_id 
behave with such big tables? (bc I assume that you obviously can't 
denormalize absolutely everything, so this implies the need of doing 
some joins on denormalized columns like client_id).

> assuming you can access the first mapping anyway -

? I'm not clear on what you mean here.

> so you're still
> storing the first table, with stored procedures to ensure you still have
> correct data in all tables.

Regards,
mk



From mrkafk at gmail.com  Wed Mar  3 14:44:08 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 20:44:08 +0100
Subject: Docstrings considered too complicated
In-Reply-To: <539252.91463.qm@web58904.mail.re1.yahoo.com>
References: <20100303114603.7021e9ba.darcy@druid.net>
	<539252.91463.qm@web58904.mail.re1.yahoo.com>
Message-ID: <hmme68$glb$1@dough.gmane.org>

Ed Keith wrote:
> --- On Wed, 3/3/10, D'Arcy J.M. Cain  wrote:
> 
>> They needed a way to tell where the end of the information
>> was.  Why
>> they used ^Z (SUB - Substitute) instead of ^C (ETX - End of
>> TeXt) or
>> even ^D (EOT - End Of Transmission) is anyone's guess.
> 
> That has always puzzled me to. ETX and EOT were well established, why no use one of them? I'd love to know what they were thinking.

Probably nothing: what many people do with confronted with a problem.

It reminds me of why Windows uses backslashes for path separation 
instead of slashes: what I've *heard*, and do not know if it's true, 
it's because Gates fancied using / for options switch instead of -, and 
to hell with established practice.

Regards,
mk



From arnodel at googlemail.com  Wed Mar  3 14:44:41 2010
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Wed, 03 Mar 2010 19:44:41 +0000
Subject: Generic singleton
References: <mailman.222.1267642515.23598.python-list@python.org>
Message-ID: <m2iq9d197a.fsf@googlemail.com>

mk <mrkafk at gmail.com> writes:
[...]
> hashable
> ..
>     All of Python?s immutable built-in objects are hashable, while no
> mutable containers (such as lists or dictionaries) are.
>
> Well ok, hashable they're not; but apparently at least dict and list
> have id()?

lists and dicts are not hashable, but their types are:

>>> hash(dict)
4296155808
>>> hash(list)
4296151808

So just use the type as the key to the dictionary you maintain in your
singleton.  But the question is what you use your singleton for.

-- 
Arnaud


From mrkafk at gmail.com  Wed Mar  3 14:46:24 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 20:46:24 +0100
Subject: cpan for python?
In-Reply-To: <877hpt46yw.fsf@castleamber.com>
References: <mailman.20.1267367545.23598.python-list@python.org>	<hmjv4b$mqk$1@reader1.panix.com>	<2010030214473616807-tomfsessile@gmailcom>	<4b8ddea4$1@dnews.tpgi.com.au>
	<87ljea9f20.fsf@castleamber.com>	<45b1599f-a05b-4132-9e75-89a52757e71b@q21g2000yqm.googlegroups.com>
	<877hpt46yw.fsf@castleamber.com>
Message-ID: <hmmeag$glb$2@dough.gmane.org>

John Bokma wrote:
> I want to remove something that I installed that way (because it's
> installation procedure seems to be broken; opensocial) I understand that
> this can't be blamed on pip, but it's odd that in this century it's
> still hard to install/uninstall modules :-(

Have you looked in a file easy-install.pth in site-packages? In my 
experience it's enough to delete the line for package from there and 
delete package's egg or directory.

I agree that this is kind of backward, though.

Regards,
mk



From MLMDev at Comcast.net  Wed Mar  3 14:54:04 2010
From: MLMDev at Comcast.net (Mitchell L Model)
Date: Wed, 3 Mar 2010 14:54:04 -0500
Subject: CGI, POST, and file uploads
In-Reply-To: <mailman.1075.1267566496.23597.python-list@python.org>
References: <mailman.1075.1267566496.23597.python-list@python.org>
Message-ID: <67C7A291-6790-4B10-8797-D95F8AD36F9C@Comcast.net>


On Mar 2, 2010, at 4:48 PM, I wrote:

> Can someone tell me how to upload the contents of a (relatively  
> small) file using an HTML form and CGI in Python 3.1? As far as I  
> can tell from a half-day of experimenting, browsing, and searching  
> the Python issue tracker, this is broken.

followed by a detailed example demonstrating the problem.

Having hear no response, let me clarify that this request was  
preliminary to filing a bug report -- I wanted to make sure I wasn't  
missing something here. If nothing else, this failure should be  
documented rather than the 3.1 library documentation continuing to  
describe how to upload file contents with POST. If someone thinks  
there is a way to make this work in 3.1, or that it isn't a bug  
because CGI is hopeless (i.e., non-WSGI-compliant), or that the  
documentation shouldn't be changed, please respond. I'd rather have  
this particular discussion here than in the bug tracking system.

Meanwhile, let me heartily recommend the Bottle Web Framework (http://bottle.paws.de 
) for its simplicity, flexibility, and power. Very cool stuff. To make  
it work in Python3.1, do the following:
	1. run 2to3 on bottle.py (the only file there is to download)
	2. copy or move the resulting bottle.py to the site-libs directory in  
your Python installation's library directory
	3. don't use request.GET.getone or request.POST.getone -- instead of  
getone, use get (the protocol changed to that of the Mapping ABC from  
the collections module)
	4. the contents of a file will be returned inside a cgi.FieldStorage  
object, so you need to add '.value' after the call to get in that case



From drobinow at gmail.com  Wed Mar  3 14:54:27 2010
From: drobinow at gmail.com (David Robinow)
Date: Wed, 3 Mar 2010 14:54:27 -0500
Subject: Docstrings considered too complicated
In-Reply-To: <539252.91463.qm@web58904.mail.re1.yahoo.com>
References: <20100303114603.7021e9ba.darcy@druid.net>
	<539252.91463.qm@web58904.mail.re1.yahoo.com>
Message-ID: <4eb0089f1003031154j78cc7d22kf18ae339fe8c686@mail.gmail.com>

On Wed, Mar 3, 2010 at 1:01 PM, Ed Keith <e_d_k at yahoo.com> wrote:
> --- On Wed, 3/3/10, D'Arcy J.M. Cain ?wrote:
>
>> They needed a way to tell where the end of the information
>> was.? Why
>> they used ^Z (SUB - Substitute) instead of ^C (ETX - End of
>> TeXt) or
>> even ^D (EOT - End Of Transmission) is anyone's guess.
>
> That has always puzzled me to. ETX and EOT were well established, why no use one of them? I'd love to know what they were thinking.

There were numerous incompatible and primitive transfer protocols in
those days. They probably wanted to pick something that was NOT well
established so it would pass through without, for example, causing End
Of Transmission.


From python at mrabarnett.plus.com  Wed Mar  3 14:59:22 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 03 Mar 2010 19:59:22 +0000
Subject: Sort Big File Help
In-Reply-To: <hmm98g$sdk$1@dough.gmane.org>
References: <374400.23537.qm@web33805.mail.mud.yahoo.com>
	<hmm98g$sdk$1@dough.gmane.org>
Message-ID: <4B8EBF9A.6080603@mrabarnett.plus.com>

mk wrote:
> John Filben wrote:
>> I am new to Python but have used many other (mostly dead) languages in 
>> the past.  I want to be able to process *.txt and *.csv files.  I can 
>> now read that and then change them as needed ? mostly just take a 
>> column and do some if-then to create a new variable.  My problem is 
>> sorting these files:
>>
>> 1.)    How do I sort file1.txt by position and write out 
>> file1_sorted.txt; for example, if all the records are 100 bytes long 
>> and there is a three digit id in the position 0-2; here would be some 
>> sample data:
>>
>> a.       001JohnFilben??
>>
>> b.      002Joe  Smith?..
> 
> Use a dictionary:
> 
> linedict = {}
> for line in f:
>     key = line[:3]
>     linedict[key] = line[3:] # or alternatively 'line' if you want to 
> include key in the line anyway
> 
> sortedlines = []
> for key in linedict.keys().sort():
>     sortedlines.append(linedict[key])
> 
> (untested)
> 
> This is the simplest, and probably inefficient approach. But it should 
> work.
> 
[snip]
Simpler would be:

     lines = f.readlines()
     lines.sort(key=lambda line: line[ : 3])

or even:

     lines = sorted(f.readlines(), key=lambda line: line[ : 3]))



From invalid at invalid.invalid  Wed Mar  3 15:02:28 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Wed, 3 Mar 2010 20:02:28 +0000 (UTC)
Subject: Docstrings considered too complicated
References: <20100303114603.7021e9ba.darcy@druid.net>
	<539252.91463.qm@web58904.mail.re1.yahoo.com>
	<mailman.230.1267645508.23598.python-list@python.org>
Message-ID: <hmmf8k$5vl$1@reader1.panix.com>

On 2010-03-03, mk <mrkafk at gmail.com> wrote:

>> That has always puzzled me to. ETX and EOT were well established, why
>> no use one of them? I'd love to know what they were thinking.
>
> Probably nothing: what many people do with confronted with a problem.
>
> It reminds me of why Windows uses backslashes for path separation 
> instead of slashes: what I've *heard*, and do not know if it's true, 
> it's because Gates fancied using / for options switch instead of -,
> and to hell with established practice.

Using / for the option switch _was_ the established practice (if you
came from a DEC background the way that CP/M and DOS did).

-- 
Grant Edwards               grant.b.edwards        Yow! Boy, am I glad it's
                                  at               only 1971...
                              gmail.com            


From benjamin.kaplan at case.edu  Wed Mar  3 15:12:31 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 3 Mar 2010 15:12:31 -0500
Subject: Installing Scrapy on Mac OS X 10.6
In-Reply-To: <9b08574f-0410-45bc-89af-0d3cf7d21819@e7g2000yqf.googlegroups.com>
References: <9b08574f-0410-45bc-89af-0d3cf7d21819@e7g2000yqf.googlegroups.com>
Message-ID: <ec96e1391003031212m6afc142ah644ba71edb3895d6@mail.gmail.com>

On Wed, Mar 3, 2010 at 12:06 PM, Sky Larking <skylarking11 at gmail.com> wrote:

> Has anyone successfully installed Scrapy ( http://scrapy.org ) on a
> Mac OS X machine running 10.6.x? The Documentaion says
> Mac OS X ships an libxml2 version too old to be used by Scrapy...But
> doesn't say which version of OS X.. I am wondering if the version of
> libxml2 is also not compatible..
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Looks like it's shipping with 2.7.3. Scrappy requires 2.6.28 so it should
work but I haven't tried.
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From tjreedy at udel.edu  Wed Mar  3 15:18:26 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 03 Mar 2010 15:18:26 -0500
Subject: Re Interest check in some delicious syntactic sugar for
	"except:pass"
In-Reply-To: <35e00b331003030347x30f3f2faua96a9b72814743da@mail.gmail.com>
References: <35e00b331003030347x30f3f2faua96a9b72814743da@mail.gmail.com>
Message-ID: <hmmg6i$o9o$1@dough.gmane.org>

On 3/3/2010 6:47 AM, Oren Elrad wrote:

> With that said, let me at least offer a token defense of my position.
> By way of motivation, I wrote that email after copying/pasting the
> following a few times around a project until I wrote it into def
> SilentlyDelete() and its cousin SilentlyRmdir()
>
> """ code involving somefile """
> try:
> ........os.remove(somefile)
> except:
> .......pass     # The bloody search indexer has got the file and I
> can't delete it. Nothing to be done.
>
> Certainly the parade of horribles (bad files! corrupt data! syntax
> errors!) is a tad melodramatic. Either os.remove() succeeds or it
> doesn't and the execution path (in the estimation of this programmer,
> at least) is not at all impacted by whether it succeeds or fails. I
> know with certainty at compile time what exceptions might be raised
> and what the consequences of passing them are and there is no sense
> pestering the user or sweating over it. Nor can I see the logic, as
> was suggested, in writing "except OSError:" since (seems to me) mere
> surplusage -- it neither causes a semantic difference in the way the
> program runs nor provides anything useful to the reader.

Suppose you misspell 'somefile' or 'remove' (or the file gets corrupted 
somehow -- which unfortunate can happen). Now you suppress the NameError 
or AttributeError, which is a mistake. Suppose someone copies your code 
into a context where 'os' is not imported or where 'os' is a variable 
(for bone type, for instance). More bad error suppression.

Bare excepts seem ok for experimental, draft, or throwaway code, but 
somewhat dubious for production code.

For anyone reading your code a few years from now, 'except OSError' 
would be clearer that that is all you mean to pass on.

Wrapping the code in a function makes the overhead of adding 'OSError' 
trivial. It also makes it trivial to do something different, like adding 
the file to a collection to be retried later. It also reduces the points 
of possible corruption to one instead of many.

Terry Jan Reedy



From tjreedy at udel.edu  Wed Mar  3 15:47:11 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 03 Mar 2010 15:47:11 -0500
Subject: Which mock library do you prefer?
In-Reply-To: <kypi0m.i9s@spenarnc.xs4all.nl>
References: <f3baba98-a0fc-4c6a-9fff-661da8356bc0@h2g2000yqj.googlegroups.com>	<485b80f9-96c7-4946-8f38-44eb7d81fe1d@z19g2000yqk.googlegroups.com>	<87sk90c499.fsf@benfinney.id.au>	<e88f4781-4b1f-4a9d-8c61-3a13c854c280@d27g2000yqn.googlegroups.com>
	<kypi0m.i9s@spenarnc.xs4all.nl>
Message-ID: <hmmhsf$uk5$1@dough.gmane.org>

On 3/3/2010 7:43 AM, Albert van der Horst wrote:

>> Right, isolation is essential. But I can't decide to which extent I
>> should propagate isolation.
>> For example, in "Python Testing: Beginner's Guide" by Daniel Arbuckle,
>> author suggests that if you do unittesting you should isolate the
>> smallest units of code from each other. For example, if you have a
>> class:
>> Class SomeClass(object):
>>     def method1(self):
>>         return 5
>>     def method2(self):
>>         return self.method1 + 10
>>
>> According to the book, if you want to test method2, you should isolate
>> it from method1 and class instance('self').
>> Other books are not so strict...
>>
>> And what should I follow as newbie?

Pretty much any test assumes that basic things other than the tested 
object work correctly. For instance, any test of method2 will assume 
that '+' works correctly. The dependency graph between methods in a 
class will nearly always be acyclic. So I would start with the 'leaf' 
methods and work up. In the above case, test method1 first and then 
method2. The dependence of the test of method2 on the correctness of 
method1 is hardly worse, to me, then its dependence on the correctness 
of int.__add__. It is just the the responsibility for the latter falls 
on the developers, and *their* suite of tests.

Whenever any code test fails, there are two possibilities. The code 
itself is buggy, or something it depends on is buggy. I see two reasons 
for isolation and mock units: test resource saving (especially time) and 
independent development. If you are developing ClassA and someone else 
is developing ClassB, you might want to test ClassA even though it 
depends on ClassB and classB is not ready yet. This consideration is 
much less likely to apply to method2 versus method1 of a coherent class.

My current opinions.

Terry Jan Reedy





From cartercc at gmail.com  Wed Mar  3 15:54:53 2010
From: cartercc at gmail.com (ccc31807)
Date: Wed, 3 Mar 2010 12:54:53 -0800 (PST)
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
Message-ID: <fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>

On Mar 3, 12:36?pm, Xah Lee <xah... at gmail.com> wrote:
> recently i wrote a blog article on The NoSQL Movement
> athttp://xahlee.org/comp/nosql.html
>
> i'd like to post it somewhere public to solicit opinions, but in the
> 20 min or so, i couldn't find a proper newsgroup, nor private list
> that my somewhat anti-NoSQL Movement article is fitting.

I only read the first two paragraphs of your article, so I can't
respond to it.

I've halfway followed the NoSQL movement. My day job is a database
manager and I so SQL databases for a living, as well as Perl. I see a
lot of abuse of relational databases in the Real World, as well as a
lot of abuse for non-SQL alternatives, e.g., (mis)using Excel for a
database. The big, enterprise database we have at work is built on IBM
UniQuery, which is a non-SQL flat file database product, so I've had a
lot of experience with big non-SQL database work.

I've also developed a marked preference for plain text databases. For
a lot of applications they are simpler, easier, and better. I've also
had some experience with XML databases, and find that they are ideal
for applications with 'ragged' data.

As with anything else, you need to match the tool to the job. Yes, I
feel that relational database technology has been much used, and much
abused. However, one of my favorite applications is Postgres, and I
think it's absolutely unbeatable where you have to store data and
perform a large number of queries.

Finally, with regard to Structured Query Language itself, I find that
it's well suited to its purpose. I hand write a lot of SQL statements
for various purposes, and while like any language you find it
exceedingly difficult to express concepts that you can think, it
mostly allows the expression of most of what you want to say.

CC.


From mrkafk at gmail.com  Wed Mar  3 15:58:15 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 21:58:15 +0100
Subject: taking python enterprise level?...
In-Reply-To: <973824D8-3020-44A8-B2DA-501FF530457B@semanchuk.com>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>	<20100302015813.5397655e.darcy@druid.net>	<hmm2jc$28u$1@dough.gmane.org>
	<973824D8-3020-44A8-B2DA-501FF530457B@semanchuk.com>
Message-ID: <hmmih7$1bs$1@dough.gmane.org>

Philip Semanchuk wrote:
>> So there *may* be some evidence that joins are indeed bad in practice. 
>> If someone has smth specific/interesting on the subject, please post.
> 
> It's an unprovable assertion, or a meaningless one depending on how one 
> defines the terms. You could also say "there *may* be some evidence that 
> Python lists are bad in practice". Python lists and SQL JOINs are like 
> any part of a language or toolkit. They're good tools for solving 
> certain classes of problems. They can also be misapplied to problems 
> that they're not so good at. Sometimes they're a performance bottleneck, 
> even when solving the problems for which they're best. Sometimes the 
> best way to solve a performance bottleneck is to redesign your 
> app/system so you don't need to solve that kind of problem anymore 
> (hence the join-less databases). Other times, the cure is worse than the 
> disease and you're better off throwing hardware at the problem.

Look, I completely agree with what you're saying, but: that doesn't 
change the possibility that joins may be expensive in comparison to 
other SQL operations. This is the phrase I should have used perhaps; 
'expensive in comparison with other SQL operations' instead of 'bad'.

Example from my app, where I behaved "by the book" (I hope) and 
normalized my data:

$ time echo "\c hrs;
SELECT hosts.ip, reservation.start_date, architecture.architecture, 
os_kind.os_kind, os_rel.os_rel, os_version.os_version, project.project, 
email.email FROM hosts
  INNER JOIN project ON project.id = hosts.project_id
  INNER JOIN architecture ON hosts.architecture_id = architecture.id
  INNER JOIN os_kind ON os_kind.id = hosts.os_kind_id
  INNER JOIN os_rel ON hosts.os_rel_id = os_rel.id
  INNER JOIN os_version ON hosts.os_version_id = os_version.id
  INNER JOIN reservation_hosts ON hosts.id = reservation_hosts.host_id
  INNER JOIN reservation on reservation.id = 
reservation_hosts.reservation_id
  INNER JOIN email ON reservation.email_id = email.id

;" | psql > /dev/null

real    0m0.099s
user    0m0.015s
sys     0m0.005s



$ time echo "\c hrs;
 > SELECT hosts.ip FROM hosts;
 > SELECT reservation.start_date FROM reservation;
 > SELECT architecture.architecture FROM architecture;
 > SELECT os_rel.os_rel FROM os_rel;
 > SELECT os_version.os_version FROM os_version;
 > SELECT project.project FROM project;
 > SELECT email.email FROM email;
 > " | psql > /dev/null

real    0m0.046s
user    0m0.008s
sys     0m0.004s

Note: I've created indexes on those tables, both on data columns like 
hosts.ip and on .id columns.

So yes, joins apparently are at least twice as expensive as simple 
selects without joins, on a small dataset. Not a drastic increase in 
cost, but smth definitely shows.

It would be interesting to see what happens when row numbers increase to 
large numbers, but I have no such data.

Regards,
mk




From arnodel at googlemail.com  Wed Mar  3 15:58:39 2010
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Wed, 03 Mar 2010 20:58:39 +0000
Subject: Sort Big File Help
References: <374400.23537.qm@web33805.mail.mud.yahoo.com>
	<hmm98g$sdk$1@dough.gmane.org>
	<mailman.234.1267646366.23598.python-list@python.org>
Message-ID: <m2eik115s0.fsf@googlemail.com>

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

> mk wrote:
>> John Filben wrote:
>>> I am new to Python but have used many other (mostly dead) languages
>>> in the past.  I want to be able to process *.txt and *.csv files.
>>> I can now read that and then change them as needed ? mostly just
>>> take a column and do some if-then to create a new variable.  My
>>> problem is sorting these files:
>>>
>>> 1.)    How do I sort file1.txt by position and write out
>>> file1_sorted.txt; for example, if all the records are 100 bytes
>>> long and there is a three digit id in the position 0-2; here would
>>> be some sample data:
>>>
>>> a.       001JohnFilben??
>>>
>>> b.      002Joe  Smith?..
>>
>> Use a dictionary:
>>
>> linedict = {}
>> for line in f:
>>     key = line[:3]
>>     linedict[key] = line[3:] # or alternatively 'line' if you want
>> to include key in the line anyway
>>
>> sortedlines = []
>> for key in linedict.keys().sort():
>>     sortedlines.append(linedict[key])
>>
>> (untested)
>>
>> This is the simplest, and probably inefficient approach. But it
>> should work.
>>
> [snip]
> Simpler would be:
>
>     lines = f.readlines()
>     lines.sort(key=lambda line: line[ : 3])
>
> or even:
>
>     lines = sorted(f.readlines(), key=lambda line: line[ : 3]))

Or even:

    lines = sorted(f)

-- 
Arnaud


From tjreedy at udel.edu  Wed Mar  3 16:00:11 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 03 Mar 2010 16:00:11 -0500
Subject: Working group for Python CPAN-equivalence?
In-Reply-To: <4b8e929d$0$1585$742ec2ed@news.sonic.net>
References: <mailman.179.1267620332.23598.python-list@python.org>	<87r5o1v8vp.fsf@benfinney.id.au>
	<4b8e929d$0$1585$742ec2ed@news.sonic.net>
Message-ID: <hmmiks$1ru$1@dough.gmane.org>

On 3/3/2010 12:05 PM, John Nagle wrote:

>> We have an equivalent in PyPI, though it's incomplete since many
>> *registered* packages are not actually hosted *at* PyPI.
>
> CPAN is a repository. PyPi is an collection of links.

As Ben said, PyPI currently is also a respository and not just links to 
other repositories.

> CPAN has over 260 mirrors. PyPi has none.

A mirroring system has been or is being set up with at least a couple of 
mirrors for things that are hosted at PyPI.

> CPAN enforces standard organization on packages. PyPi does not.
>
> CPAN has quality control, with testers and a test reporting system.
> PyPi does not.

People who are familiar with and like CPAN are free to help improve 
PyPI. Those of us not familiar with it may not know what we are missing, 
or have little idea about what works with CPAN.

Terry Jan Reedy



From malaclypse2 at gmail.com  Wed Mar  3 16:02:02 2010
From: malaclypse2 at gmail.com (Jerry Hill)
Date: Wed, 3 Mar 2010 16:02:02 -0500
Subject: A "scopeguard" for Python
In-Reply-To: <hmmdgd$17s$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<hmm0rd$a48$1@news.eternal-september.org>
	<mailman.211.1267636174.23598.python-list@python.org>
	<hmm5ln$arg$1@news.eternal-september.org>
	<mailman.221.1267642316.23598.python-list@python.org>
	<hmmdgd$17s$1@news.eternal-september.org>
Message-ID: <16651e81003031302s6aac798al2864c8b742d577c3@mail.gmail.com>

On Wed, Mar 3, 2010 at 2:32 PM, Alf P. Steinbach <alfps at start.no> wrote:
> I'm not sure what that shows, except that you haven't grokked this yet.

Maybe you could give us an example of how your code should be used,
and how it differs from the other examples people have given?  And
maybe a quick example of why you would not want to clean up after a
failed operation?

I've been trying to follow along, and I don't get it either.  I guess
that makes me at least the third person that doesn't understand what
you're trying to get across.

-- 
Jerry


From robert.kern at gmail.com  Wed Mar  3 16:02:31 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 03 Mar 2010 15:02:31 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <hmmdgd$17s$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>
	<hmmdgd$17s$1@news.eternal-september.org>
Message-ID: <hmmip9$2fc$1@dough.gmane.org>

On 2010-03-03 13:32 PM, Alf P. Steinbach wrote:
> * Robert Kern:
>> On 2010-03-03 11:18 AM, Alf P. Steinbach wrote:
>>> * Robert Kern:
>>>> On 2010-03-03 09:56 AM, Alf P. Steinbach wrote:
>>>>> * Mike Kent:
>>>>>> What's the compelling use case for this vs. a simple try/finally?
>>>>>
>>>>> if you thought about it you would mean a simple "try/else".
>>>>> "finally" is
>>>>> always executed. which is incorrect for cleanup
>>>>
>>>> Eh? Failed execution doesn't require cleanup? The example you gave is
>>>> definitely equivalent to the try: finally: that Mike posted.
>>>
>>> Sorry, that's incorrect: it's not.
>>>
>>> With correct code (mine) cleanup for action A is only performed when
>>> action A succeeds.
>>>
>>> With incorrect code cleanup for action A is performed when A fails.
>>
>> Oh?
>>
>> $ cat cleanup.py
>>
>> class Cleanup:
>> def __init__( self ):
>> self._actions = []
>>
>> def call( self, action ):
>> assert( callable( action ) )
>> self._actions.append( action )
>>
>> def __enter__( self ):
>> return self
>>
>> def __exit__( self, x_type, x_value, x_traceback ):
>> while( len( self._actions ) != 0 ):
>> try:
>> self._actions.pop()()
>> except BaseException as x:
>> raise AssertionError( "Cleanup: exception during cleanup" )
>>
>> def print_(x):
>> print x
>>
>> with Cleanup() as at_cleanup:
>> at_cleanup.call(lambda: print_("Cleanup executed without an exception."))
>>
>> with Cleanup() as at_cleanup:
>
> *Here* is where you should
>
> 1) Perform the action for which cleanup is needed.
>
> 2) Let it fail by raising an exception.
>
>
>> at_cleanup.call(lambda: print_("Cleanup execute with an exception."))
>> raise RuntimeError()
>
> With an exception raised here cleanup should of course be performed.
>
> And just in case you didn't notice: the above is not a test of the
> example I gave.
>
>
>> $ python cleanup.py
>> Cleanup executed without an exception.
>> Cleanup execute with an exception.
>> Traceback (most recent call last):
>> File "cleanup.py", line 28, in <module>
>> raise RuntimeError()
>> RuntimeError
>>
>>>> The actions are always executed in your example,
>>>
>>> Sorry, that's incorrect.
>>
>> Looks like it to me.
>
> I'm sorry, but you're
>
> 1) not testing my example which you're claiming that you're testing, and

Then I would appreciate your writing a complete, runnable example that 
demonstrates the feature you are claiming. Because it's apparently not 
"ensur[ing] some desired cleanup at the end of a scope, even when the scope is 
exited via an exception" that you talked about in your original post.

Your sketch of an example looks like mine:

   with Cleanup as at_cleanup:
       # blah blah
       chdir( somewhere )
       at_cleanup.call( lambda: chdir( original_dir ) )
       # blah blah

The cleanup function gets registered immediately after the first chdir() and 
before the second "blah blah". Even if an exception is raised in the second 
"blah blah", then the cleanup function will still run. This would be equivalent 
to a try: finally:

# blah blah #1
chdir( somewhere )
try:
     # blah blah #2
finally:
     chdir( original_dir )

and not a try: else:

# blah blah #1
chdir( somewhere )
try:
     # blah blah #2
else:
     chdir( original_dir )

Now, I assumed that the behavior with respect to exceptions occurring in the 
first "blah blah" weren't what you were talking about because until the chdir(), 
there is nothing to clean up.

There is no way that the example you gave translates to a try: else: as you 
claimed in your response to Mike Kent.

> 2) not even showing anything about your earlier statements, which were
> just incorrect.
>
> You're instead showing that my code works as it should for the case that
> you're testing, which is a bit unnecessary since I knew that, but thanks
> anyway.

It's the case you seem to be talking about in your original post. You seem to 
have changed your mind about what you want to talk about. That's fine. We don't 
have to stick with the original topic, but I do ask you to acknowledge that you 
originally were talking about a feature that "ensure[s] some desired cleanup at 
the end of a scope, even when the scope is exited via an exception."

Do you acknowledge this?

> I'm not sure what that shows, except that you haven't grokked this yet.
>
>
>>>> From your post, the scope guard technique is used "to ensure some
>>>> desired cleanup at the end of a scope, even when the scope is exited
>>>> via an exception." This is precisely what the try: finally: syntax is
>>>> for.
>>>
>>> You'd have to nest it. That's ugly. And more importantly, now two people
>>> in this thread (namely you and Mike) have demonstrated that they do not
>>> grok the try functionality and manage to write incorrect code, even
>>> arguing that it's correct when informed that it's not, so it's a pretty
>>> fragile construct, like goto.
>>
>> Uh-huh.
>
> Yeah. Consider that you're now for the third time failing to grasp the
> concept of cleanup for a successful operation.

Oh, I do. But if I didn't want it to run on an exception, I'd just write the 
code without any try:s or with:s at all.

# blah blah #1
chdir( somewhere )
# blah blah #2
chdir( original_dir )

>>>> The with statement allows you to encapsulate repetitive boilerplate
>>>> into context managers, but a general purpose context manager like your
>>>> Cleanup class doesn't take advantage of this.
>>>
>>> I'm sorry but that's pretty meaningless. It's like: "A house allows you
>>> to encapsulate a lot of stinking garbage, but your house doesn't take
>>> advantage of that, it's disgustingly clean". Hello.
>>
>> No, I'm saying that your Cleanup class is about as ugly as the try:
>> finally:. It just shifts the ugliness around. There is a way to use
>> the with statement to make things look better and more readable in
>> certain situations, namely where there is some boilerplate that you
>> would otherwise repeat in many places using try: finally:. You can
>> encapsulate that repetitive code into a class or a @contextmanager
>> generator and just call the contextmanager. A generic context manager
>> where you register callables doesn't replace any boilerplate. You
>> still repeat all of the cleanup code everywhere. What's more, because
>> you have to shove everything into a callable, you have significantly
>> less flexibility than the try: finally:.
>
> Sorry, but that's meaningless again. You're repeating that my house has
> no garbage in it.

No, I'm repeatedly saying that I think your solution stinks. I think it's ugly. 
I think it's restrictive. I think it does not improve on the available solutions.

> And you complain that it would be work to add garbage
> to it. Why do you want that garbage? I think it's nice without it!

And you are entitled to that opinion. I am giving you mine.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From mrkafk at gmail.com  Wed Mar  3 16:11:40 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 22:11:40 +0100
Subject: Generic singleton
In-Reply-To: <m2iq9d197a.fsf@googlemail.com>
References: <mailman.222.1267642515.23598.python-list@python.org>
	<m2iq9d197a.fsf@googlemail.com>
Message-ID: <hmmjad$4gm$1@dough.gmane.org>

Arnaud Delobelle wrote:
> mk <mrkafk at gmail.com> writes:
> [...]
>> hashable
>> ..
>>     All of Python?s immutable built-in objects are hashable, while no
>> mutable containers (such as lists or dictionaries) are.
>>
>> Well ok, hashable they're not; but apparently at least dict and list
>> have id()?
> 
> lists and dicts are not hashable, but their types are:

Oh.

>>>> hash(dict)
> 4296155808
>>>> hash(list)
> 4296151808
> 
> So just use the type as the key to the dictionary you maintain in your
> singleton.  

Hmm I have tested it and it seems to work.

> But the question is what you use your singleton for.

Well, partly this was for sake of learning; but partially I was thinking 
whether singleton as such may be useful for implementing "global queue 
of tasks" for worker threads in a large program: instead of handing down 
over and over the same reference to the global queue of tasks, classes 
or functions could call Singleton() and be done with it.

Or I could make my life simpler and use global variable. :-)

I will soon need to write such program, with remote calls from pyro 
(most probably), many worker threads, short-running jobs and 
long-running jobs, etc.


Regards,
mk



From wanderer at dialup4less.com  Wed Mar  3 16:15:07 2010
From: wanderer at dialup4less.com (Wanderer)
Date: Wed, 3 Mar 2010 13:15:07 -0800 (PST)
Subject: Pylint Argument number differs from overridden method
References: <2484ca6e-0eb9-4e0c-a7db-d035badab711@t20g2000yqe.googlegroups.com>
	<mailman.226.1267644846.23598.python-list@python.org>
Message-ID: <9ca2e014-f238-4b55-8ace-f884b2112a19@z11g2000yqz.googlegroups.com>

On Mar 3, 2:33?pm, Robert Kern <robert.k... at gmail.com> wrote:
> On 2010-03-03 11:39 AM, Wanderer wrote:
>
> > Pylint W0221 gives the warning
> > Argument number differs from overridden method.
>
> > Why is this a problem? I'm overriding the method to add additional
> > functionality.
>
> There are exceptions to every guideline. Doing this could easily be a mistake,
> so it's one of the many things that Pylint checks for. Silence the warning if
> you like.
>
> --
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless enigma
> ? that is made terrible by our own mad attempt to interpret it as though it had
> ? an underlying truth."
> ? ?-- Umberto Eco

Thanks I was just wondering if I was overlooking something about
inheritance.


From tjreedy at udel.edu  Wed Mar  3 16:17:11 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 03 Mar 2010 16:17:11 -0500
Subject: Pylint Argument number differs from overridden method
In-Reply-To: <2484ca6e-0eb9-4e0c-a7db-d035badab711@t20g2000yqe.googlegroups.com>
References: <2484ca6e-0eb9-4e0c-a7db-d035badab711@t20g2000yqe.googlegroups.com>
Message-ID: <hmmjkn$5og$1@dough.gmane.org>

On 3/3/2010 12:39 PM, Wanderer wrote:
> Pylint W0221 gives the warning
> Argument number differs from overridden method.
>
> Why is this a problem?

It *could* indicate a mistake. Lint programs, by definition, are 
nitpicky, and flag things that are possible problems even though 
syntactically correct.


I'm overriding the method to add additional
> functionality.
>
> This
>      def GetRays(self, angle, pt, lmbda = 0.6):
>          """
>          """
>
>          angle, x, y, Rays, Power = self.ARefract(angle, pt[0], pt[1],
> lmbda)
>          pt1 = (x, y)
>
>          return Rays, Power, angle, pt1
>
>
>      def ARefract(self, angle, x, y, lmbda = 0.6):
>          """
>          """
>
>          Nt = self.Mat.NtGet(lmbda)
>          self.NtSet(Nt)
>          angle, x, y, Rays, Power = self.Refract(angle, x, y)
>
>          return angle, x, y, Rays, Power
>
>
>
> Over rides this
>
>      def GetRays(self, angle, pt):
>          """
>          """
>
>          angle, x, y, Rays, Power = self.Refract(angle, pt[0], pt[1])
>          pt1 = (x, y)
>
>          return Rays, Power, angle, pt1
>
>
> Thanks




From mrkafk at gmail.com  Wed Mar  3 16:19:04 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 22:19:04 +0100
Subject: Docstrings considered too complicated
In-Reply-To: <hmmdrf$fco$1@dough.gmane.org>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>	<4B8B9845.70604@sequans.com>	<mailman.59.1267456634.23598.python-list@python.org>	<7v695nFa0fU1@mid.individual.net>	<4B8E7538.2080003@mrabarnett.plus.com>	<20100303111248.7f40d659.darcy@druid.net>	<hmm7l9$m4f$1@dough.gmane.org>
	<hmmdrf$fco$1@dough.gmane.org>
Message-ID: <hmmjo9$634$1@dough.gmane.org>

Steve Holden wrote:

> Puts me in mind of Mario Wolczko's early attempts to implement SmallTalk
> on a VAX 11/750. The only bitmapped display we had available was a Three
> Rivers PERQ, connected by a 9600bps serial line. We left it running at
> seven o'clock one evening, and by nine am the next day it had brought up
> about two thirds of the initial VM loader screen ...
> 
> You tell these young kids, and they just don't believe you!

For the uncouth yobs, err, culturally-challenged:

http://www.youtube.com/watch?v=Xe1a1wHxTyo

(Four Yorkshiremen)

Regards,
mk



From nad at acm.org  Wed Mar  3 16:22:59 2010
From: nad at acm.org (Ned Deily)
Date: Wed, 03 Mar 2010 13:22:59 -0800
Subject: Installing Scrapy on Mac OS X 10.6
References: <9b08574f-0410-45bc-89af-0d3cf7d21819@e7g2000yqf.googlegroups.com>
Message-ID: <nad-BC3969.13225903032010@dough.gmane.org>

In article 
<9b08574f-0410-45bc-89af-0d3cf7d21819 at e7g2000yqf.googlegroups.com>,
 Sky Larking <skylarking11 at gmail.com> wrote:
> Has anyone successfully installed Scrapy ( http://scrapy.org ) on a
> Mac OS X machine running 10.6.x? The Documentaion says
> Mac OS X ships an libxml2 version too old to be used by Scrapy...But
> doesn't say which version of OS X.. I am wondering if the version of
> libxml2 is also not compatible..

A similar question came up on Stack Overflow recently:

http://stackoverflow.com/questions/2353957/do-i-need-32bit-libxml2-for-py
thon-on-snow-leopard/

-- 
 Ned Deily,
 nad at acm.org



From darcy at druid.net  Wed Mar  3 16:23:14 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Wed, 3 Mar 2010 16:23:14 -0500
Subject: taking python enterprise level?...
In-Reply-To: <hmmdtn$fkn$1@dough.gmane.org>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>
	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>
	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>
	<20100302015813.5397655e.darcy@druid.net>
	<hmm2jc$28u$1@dough.gmane.org> <1267638602.988.19.camel@localhost>
	<hmmdtn$fkn$1@dough.gmane.org>
Message-ID: <20100303162314.a46484cf.darcy@druid.net>

On Wed, 03 Mar 2010 20:39:35 +0100
mk <mrkafk at gmail.com> wrote:
> > If you denormalise the table, and update the first index to be on
> > (client_id, project_id, date) it can end up running far more quickly -

Maybe.  Don't start with denormalization.  Write it properly and only
consider changing if profiling suggests that that is your bottleneck.
With a decent database engine and proper design it will hardly ever be.

>  From what you write further in the mail I conclude that you have not 
> eliminated the first table, just made table projects look like I wrote 
> above, right? (and used stored procedures to make sure that both tables 
> contain the relevant data for client_id and project_id columns in both 
> tables)

Note that rather than speeding things up this could actually slow
things down depending on your usage.  If you do lots of updates and you
have to write extra information every time then that's worse than a few
extra reads, especially since read data can be cached but written data
must be pushed to disk immediately in an ACID database.

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


From darcy at druid.net  Wed Mar  3 16:29:29 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Wed, 3 Mar 2010 16:29:29 -0500
Subject: Old farts playing with their toys (was: Docstrings...)
In-Reply-To: <4B8EABCB.6050303@mrabarnett.plus.com>
References: <20100224212303.242222c6@geekmail.INVALID>
	<eq4l57-okf2.ln1@ozzie.tundraware.com>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <7uu1ooFiipU1@mid.individual.net>
	<4B89D8BE.2040905@mrabarnett.plus.com> <4B8B9845.70604@sequans.com>
	<mailman.59.1267456634.23598.python-list@python.org>
	<7v695nFa0fU1@mid.individual.net>
	<4B8E7538.2080003@mrabarnett.plus.com>
	<20100303111248.7f40d659.darcy@druid.net>
	<4B8EABCB.6050303@mrabarnett.plus.com>
Message-ID: <20100303162929.560a17d3.darcy@druid.net>

On Wed, 03 Mar 2010 18:34:51 +0000
MRAB <python at mrabarnett.plus.com> wrote:
> But I was still able to play Nim and Duck Shoot (after keying it in)!

Did you ever play Star Trek with sound effects?  I was never able to
get it to work but supposedly if you put an AM radio tuned to a
specific frequency near the side with the I/O card it would generate
static that was supposed to be the sound of explosions.

Of course, the explosions were happening in a vaccum so maybe the
silence was accurate.  :-)

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


From bdesth.quelquechose at free.quelquepart.fr  Wed Mar  3 16:34:46 2010
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Wed, 03 Mar 2010 22:34:46 +0100
Subject: Generic singleton
In-Reply-To: <mailman.222.1267642515.23598.python-list@python.org>
References: <mailman.222.1267642515.23598.python-list@python.org>
Message-ID: <4b8ee36f$0$22040$426a74cc@news.free.fr>

mk a ?crit :
> 
> does every builtin class have unique id?

Classes are objects. And every object *within a python process* has it's
own unique id. For a definition of "unique" being "unique amongst the
objects living in the process at a given time" - IOW, if an object is
garbage-collected, it's id can (and will) be reused. For the record, in
CPython, the id value is the address of the (virtual) memory location
where the object lives (not that you could do anything of this info from
within Python - no pointers here).






From alfps at start.no  Wed Mar  3 16:35:09 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 03 Mar 2010 22:35:09 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.241.1267650180.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>
	<mailman.241.1267650180.23598.python-list@python.org>
Message-ID: <hmmkmh$mt1$1@news.eternal-september.org>

* Robert Kern:
> On 2010-03-03 13:32 PM, Alf P. Steinbach wrote:
>> * Robert Kern:
>>> On 2010-03-03 11:18 AM, Alf P. Steinbach wrote:
>>>> * Robert Kern:
>>>>> On 2010-03-03 09:56 AM, Alf P. Steinbach wrote:
>>>>>> * Mike Kent:
>>>>>>> What's the compelling use case for this vs. a simple try/finally?
>>>>>>
>>>>>> if you thought about it you would mean a simple "try/else".
>>>>>> "finally" is
>>>>>> always executed. which is incorrect for cleanup
>>>>>
>>>>> Eh? Failed execution doesn't require cleanup? The example you gave is
>>>>> definitely equivalent to the try: finally: that Mike posted.
>>>>
>>>> Sorry, that's incorrect: it's not.
>>>>
>>>> With correct code (mine) cleanup for action A is only performed when
>>>> action A succeeds.
>>>>
>>>> With incorrect code cleanup for action A is performed when A fails.
>>>
>>> Oh?
>>>
>>> $ cat cleanup.py
>>>
>>> class Cleanup:
>>> def __init__( self ):
>>> self._actions = []
>>>
>>> def call( self, action ):
>>> assert( callable( action ) )
>>> self._actions.append( action )
>>>
>>> def __enter__( self ):
>>> return self
>>>
>>> def __exit__( self, x_type, x_value, x_traceback ):
>>> while( len( self._actions ) != 0 ):
>>> try:
>>> self._actions.pop()()
>>> except BaseException as x:
>>> raise AssertionError( "Cleanup: exception during cleanup" )
>>>
>>> def print_(x):
>>> print x
>>>
>>> with Cleanup() as at_cleanup:
>>> at_cleanup.call(lambda: print_("Cleanup executed without an 
>>> exception."))
>>>
>>> with Cleanup() as at_cleanup:
>>
>> *Here* is where you should
>>
>> 1) Perform the action for which cleanup is needed.
>>
>> 2) Let it fail by raising an exception.
>>
>>
>>> at_cleanup.call(lambda: print_("Cleanup execute with an exception."))
>>> raise RuntimeError()
>>
>> With an exception raised here cleanup should of course be performed.
>>
>> And just in case you didn't notice: the above is not a test of the
>> example I gave.
>>
>>
>>> $ python cleanup.py
>>> Cleanup executed without an exception.
>>> Cleanup execute with an exception.
>>> Traceback (most recent call last):
>>> File "cleanup.py", line 28, in <module>
>>> raise RuntimeError()
>>> RuntimeError
>>>
>>>>> The actions are always executed in your example,
>>>>
>>>> Sorry, that's incorrect.
>>>
>>> Looks like it to me.
>>
>> I'm sorry, but you're
>>
>> 1) not testing my example which you're claiming that you're testing, and
> 
> Then I would appreciate your writing a complete, runnable example that 
> demonstrates the feature you are claiming. Because it's apparently not 
> "ensur[ing] some desired cleanup at the end of a scope, even when the 
> scope is exited via an exception" that you talked about in your original 
> post.
> 
> Your sketch of an example looks like mine:
> 
>   with Cleanup as at_cleanup:
>       # blah blah
>       chdir( somewhere )
>       at_cleanup.call( lambda: chdir( original_dir ) )
>       # blah blah
> 
> The cleanup function gets registered immediately after the first chdir() 
> and before the second "blah blah". Even if an exception is raised in the 
> second "blah blah", then the cleanup function will still run. This would 
> be equivalent to a try: finally:
> 
> # blah blah #1
> chdir( somewhere )
> try:
>     # blah blah #2
> finally:
>     chdir( original_dir )

Yes, this is equivalent code.

The try-finally that you earlier claimed was equivalent, was not.



> and not a try: else:
> 
> # blah blah #1
> chdir( somewhere )
> try:
>     # blah blah #2
> else:
>     chdir( original_dir )

This example is however meaningless except as misdirection. There are infinitely 
many constructs that include try-finally and try-else, that the with-Cleanup 
code is not equivalent to. It's dumb to show one such.

Exactly what are you trying to prove here?

Your earlier claims are still incorrect.


> Now, I assumed that the behavior with respect to exceptions occurring in 
> the first "blah blah" weren't what you were talking about because until 
> the chdir(), there is nothing to clean up.
> 
> There is no way that the example you gave translates to a try: else: as 
> you claimed in your response to Mike Kent.

Of course there is.

Note that Mike wrapped the action A within the 'try':


<code author="Mike" correct="False">
    original_dir = os.getcwd()
    try:
        os.chdir(somewhere)
        # Do other stuff
    finally:
        os.chdir(original_dir)
        # Do other cleanup
</code>


The 'finally' he used, shown above, yields incorrect behavior.

Namely cleanup always, while 'else', in that code, can yield correct behavior 
/provided/ that it's coded correctly:


<code author="Alf" correct="ProbablyTrue" disclaimer="off the cuff">
    original_dir = os.getcwd()
    try:
        os.chdir(somewhere)
    except Whatever:
        # whatever, e.g. logging
        raise
    else:
        try:
            # Do other stuff
        finally:
            os.chdir(original_dir)
            # Do other cleanup
</code>


>> 2) not even showing anything about your earlier statements, which were
>> just incorrect.
>>
>> You're instead showing that my code works as it should for the case that
>> you're testing, which is a bit unnecessary since I knew that, but thanks
>> anyway.
> 
> It's the case you seem to be talking about in your original post.

What's this "seems"? Are you unable to read that very short post?


> You 
> seem to have changed your mind about what you want to talk about. That's 
> fine.

And what's this claim about me changing any topic?


> We don't have to stick with the original topic

Why not stick with the original topic?


>, but I do ask you 
> to acknowledge that you originally were talking about a feature that 
> "ensure[s] some desired cleanup at the end of a scope, even when the 
> scope is exited via an exception."

Yes, that's what it does.

Which is I why I wrote that.

This should not be hard to grok.


> Do you acknowledge this?

This seems like pure noise, to cover up that you were sputing a lot of incorrect 
statements earlier.


>> I'm not sure what that shows, except that you haven't grokked this yet.
>>
>>
>>>>> From your post, the scope guard technique is used "to ensure some
>>>>> desired cleanup at the end of a scope, even when the scope is exited
>>>>> via an exception." This is precisely what the try: finally: syntax is
>>>>> for.
>>>>
>>>> You'd have to nest it. That's ugly. And more importantly, now two 
>>>> people
>>>> in this thread (namely you and Mike) have demonstrated that they do not
>>>> grok the try functionality and manage to write incorrect code, even
>>>> arguing that it's correct when informed that it's not, so it's a pretty
>>>> fragile construct, like goto.
>>>
>>> Uh-huh.
>>
>> Yeah. Consider that you're now for the third time failing to grasp the
>> concept of cleanup for a successful operation.
> 
> Oh, I do. But if I didn't want it to run on an exception, I'd just write 
> the code without any try:s or with:s at all.
> 
> # blah blah #1
> chdir( somewhere )
> # blah blah #2
> chdir( original_dir )

Yes, but what's that got to do with anything?


>>>>> The with statement allows you to encapsulate repetitive boilerplate
>>>>> into context managers, but a general purpose context manager like your
>>>>> Cleanup class doesn't take advantage of this.
>>>>
>>>> I'm sorry but that's pretty meaningless. It's like: "A house allows you
>>>> to encapsulate a lot of stinking garbage, but your house doesn't take
>>>> advantage of that, it's disgustingly clean". Hello.
>>>
>>> No, I'm saying that your Cleanup class is about as ugly as the try:
>>> finally:. It just shifts the ugliness around. There is a way to use
>>> the with statement to make things look better and more readable in
>>> certain situations, namely where there is some boilerplate that you
>>> would otherwise repeat in many places using try: finally:. You can
>>> encapsulate that repetitive code into a class or a @contextmanager
>>> generator and just call the contextmanager. A generic context manager
>>> where you register callables doesn't replace any boilerplate. You
>>> still repeat all of the cleanup code everywhere. What's more, because
>>> you have to shove everything into a callable, you have significantly
>>> less flexibility than the try: finally:.
>>
>> Sorry, but that's meaningless again. You're repeating that my house has
>> no garbage in it.
> 
> No, I'm repeatedly saying that I think your solution stinks. I think 
> it's ugly. I think it's restrictive. I think it does not improve on the 
> available solutions.

First you'd have to understand it, simple as it is.


>> And you complain that it would be work to add garbage
>> to it. Why do you want that garbage? I think it's nice without it!
> 
> And you are entitled to that opinion. I am giving you mine.

Well, I'm sorry, but while you are entitled to an opinion it's not an opinion 
that carries any weight: first you need to get your facts and claims straight.

So far only this latest posting of yours has been free of directly incorrect 
statements.

But you still have a lot of statements that just show total incomprehension, 
like your example of achieving no cleanup in the case of an exception.


Cheers & hth.,

- Alf


From darcy at druid.net  Wed Mar  3 16:37:16 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Wed, 3 Mar 2010 16:37:16 -0500
Subject: DOS Follies (Was: Docstrings...)
In-Reply-To: <hmme68$glb$1@dough.gmane.org>
References: <20100303114603.7021e9ba.darcy@druid.net>
	<539252.91463.qm@web58904.mail.re1.yahoo.com>
	<hmme68$glb$1@dough.gmane.org>
Message-ID: <20100303163716.d54a6e5d.darcy@druid.net>

On Wed, 03 Mar 2010 20:44:08 +0100
mk <mrkafk at gmail.com> wrote:
> It reminds me of why Windows uses backslashes for path separation 
> instead of slashes: what I've *heard*, and do not know if it's true, 
> it's because Gates fancied using / for options switch instead of -, and 
> to hell with established practice.

That was because CP/M used slashes for options and DOS copied that.  By
the time hierarchy was added it was too late to change.

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


From e_d_k at yahoo.com  Wed Mar  3 16:43:13 2010
From: e_d_k at yahoo.com (Ed Keith)
Date: Wed, 3 Mar 2010 13:43:13 -0800 (PST)
Subject: Docstrings considered too complicated
In-Reply-To: <4eb0089f1003031154j78cc7d22kf18ae339fe8c686@mail.gmail.com>
Message-ID: <720139.74191.qm@web58902.mail.re1.yahoo.com>

--- On Wed, 3/3/10, David Robinow <drobinow at gmail.com> wrote:

> From: David Robinow <drobinow at gmail.com>
> Subject: Re: Docstrings considered too complicated
> To: python-list at python.org
> Date: Wednesday, March 3, 2010, 2:54 PM
> On Wed, Mar 3, 2010 at 1:01 PM, Ed
> Keith <e_d_k at yahoo.com>
> wrote:
> > --- On Wed, 3/3/10, D'Arcy J.M. Cain ?wrote:
> >
> >> They needed a way to tell where the end of the
> information
> >> was.? Why
> >> they used ^Z (SUB - Substitute) instead of ^C (ETX
> - End of
> >> TeXt) or
> >> even ^D (EOT - End Of Transmission) is anyone's
> guess.
> >
> > That has always puzzled me to. ETX and EOT were well
> established, why no use one of them? I'd love to know what
> they were thinking.
> 
> There were numerous incompatible and primitive transfer
> protocols in
> those days. They probably wanted to pick something that was
> NOT well
> established so it would pass through without, for example,
> causing End
> Of Transmission.

That makes a lot of sense.

   -EdK

Ed Keith
e_d_k at yahoo.com

Blog: edkeith.blogspot.com



      


From python at mrabarnett.plus.com  Wed Mar  3 16:45:46 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 03 Mar 2010 21:45:46 +0000
Subject: Old farts playing with their toys
In-Reply-To: <20100303162929.560a17d3.darcy@druid.net>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>	<4B8B9845.70604@sequans.com>	<mailman.59.1267456634.23598.python-list@python.org>	<7v695nFa0fU1@mid.individual.net>	<4B8E7538.2080003@mrabarnett.plus.com>	<20100303111248.7f40d659.darcy@druid.net>	<4B8EABCB.6050303@mrabarnett.plus.com>
	<20100303162929.560a17d3.darcy@druid.net>
Message-ID: <4B8ED88A.60502@mrabarnett.plus.com>

D'Arcy J.M. Cain wrote:
> On Wed, 03 Mar 2010 18:34:51 +0000
> MRAB <python at mrabarnett.plus.com> wrote:
>> But I was still able to play Nim and Duck Shoot (after keying it in)!
> 
> Did you ever play Star Trek with sound effects?  I was never able to
> get it to work but supposedly if you put an AM radio tuned to a
> specific frequency near the side with the I/O card it would generate
> static that was supposed to be the sound of explosions.
> 
> Of course, the explosions were happening in a vaccum so maybe the
> silence was accurate.  :-)
> 
A computer with sound? Heresy! :-)

There was some hardware that could be added to provide some sort of
video output, IIRC.

<checks wikipedia>

Aha, here it is:
http://en.wikipedia.org/wiki/MK14

and also here:

http://www.nvg.ntnu.no/sinclair/computers/mk14/mk14_photos.htm

The top-left picture looks like it has all its chips, so is the
fully-expanded version.

Oh, I forgot about the red reset button!


From bdesth.quelquechose at free.quelquepart.fr  Wed Mar  3 16:46:08 2010
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Wed, 03 Mar 2010 22:46:08 +0100
Subject: memory usage, temporary and otherwise
In-Reply-To: <mailman.220.1267642060.23598.python-list@python.org>
References: <mailman.220.1267642060.23598.python-list@python.org>
Message-ID: <4b8ee61a$0$26644$426a74cc@news.free.fr>

mk a ?crit :
> 
> Obviously, don't try this on low-memory machine:
> 
>>>> a={}
>>>> for i in range(10000000):

Note that in Python 2, this will build a list of 10000000 int objects.
You may want to use xrange instead...

> ...     a[i]='spam'*10
> ...
>>>> import sys
>>>> sys.getsizeof(a)
> 201326728
>>>> id(a[1])
> 3085643936L
>>>> id(a[100])
> 3085713568L
> 
>>>> ids={}
>>>> for i in range(len(a)):

And this build yet another list of 10000000 int objects.

> ...     ids[id(a[i])]=True
> ...
>>>> len(ids.keys())
> 10000000
> 
> Hm, apparently Python didn't spot that 'spam'*10 in a's values is really
> the same string, right?

Seems not. FWIW, Python does some caching on some values of some
immutable types (small ints, some strings etc), but this is
implementation dependant so you shouldn't rely on it.

> So sys.getsizeof returns some 200MB for this dictionary. But according
> to top RSS of the python process is 300MB. ps auxw says the same thing
> (more or less).
>
> Why the 50% overhead? (and I would swear that a couple of times RSS
> according to top grew to 800MB).

(overly simplified)

When an object is garbage-collected, the memory is not necessarily
"returned" to the system - and the system doesn't necessarily claim it
back neither until it _really_ needs it.

This avoid a _lot_ of possibly useless work for both the python
interpreter (keeping already allocated memory costs less than immediatly
returning it, just to try and allocate some more memory a couple
instructions later) and the system (ditto - FWIW, how linux handles
memory allocations is somewhat funny, if you ever programmed in C).

HTH


From mrkafk at gmail.com  Wed Mar  3 16:46:53 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 22:46:53 +0100
Subject: Sort Big File Help
In-Reply-To: <hmm98g$sdk$1@dough.gmane.org>
References: <374400.23537.qm@web33805.mail.mud.yahoo.com>
	<hmm98g$sdk$1@dough.gmane.org>
Message-ID: <hmmlcf$cdr$1@dough.gmane.org>

John, there's an error in my program, I forgot that list.sort() method 
doesn't return the list (it sorts in place). So it should look like:

#!/usr/bin/python

def sortit(fname):
     fo = open(fname)
     linedict = {}
     for line in fo:
         key = line[:3]
         linedict[key] = line
     sortedlines = []
     keys = linedict.keys()
     keys.sort()
     for key in keys:
         sortedlines.append(linedict[key])
     return sortedlines

if __name__ == '__main__':
     sortit('testfile.txt')


MRAB's solution is obviously better, provided you know about Python's 
lambda.

Regards,
mk



From bdesth.quelquechose at free.quelquepart.fr  Wed Mar  3 16:47:55 2010
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Wed, 03 Mar 2010 22:47:55 +0100
Subject: memory usage, temporary and otherwise
In-Reply-To: <4b8ee61a$0$26644$426a74cc@news.free.fr>
References: <mailman.220.1267642060.23598.python-list@python.org>
	<4b8ee61a$0$26644$426a74cc@news.free.fr>
Message-ID: <4b8ee685$0$26644$426a74cc@news.free.fr>

Bruno Desthuilliers a ?crit :
> mk a ?crit :
(snip)
>> So sys.getsizeof returns some 200MB for this dictionary. But according
>> to top RSS of the python process is 300MB. ps auxw says the same thing
>> (more or less).
>>
>> Why the 50% overhead? 

Oh, and yes - the interpreter itself, the builtins, and all imported
modules also eat some space...

(snip)


From mrkafk at gmail.com  Wed Mar  3 16:52:35 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 22:52:35 +0100
Subject: Sort Big File Help
In-Reply-To: <4B8EBF9A.6080603@mrabarnett.plus.com>
References: <374400.23537.qm@web33805.mail.mud.yahoo.com>	<hmm98g$sdk$1@dough.gmane.org>
	<4B8EBF9A.6080603@mrabarnett.plus.com>
Message-ID: <hmmln3$dnk$1@dough.gmane.org>

MRAB wrote:

> [snip]
> Simpler would be:
> 
>     lines = f.readlines()
>     lines.sort(key=lambda line: line[ : 3])
> 
> or even:
> 
>     lines = sorted(f.readlines(), key=lambda line: line[ : 3]))

Sure, but a complete newbie (I have this impression about OP) doesn't 
have to know about lambda.

I expected my solution to be slower, but it's not (on a file with 
100,000 random string lines):

# time ./sort1.py

real    0m0.386s
user    0m0.372s
sys     0m0.014s

# time ./sort2.py

real    0m0.303s
user    0m0.286s
sys     0m0.017s


sort1.py:

#!/usr/bin/python

def sortit(fname):
     lines = open(fname).readlines()
     lines.sort(key = lambda x: x[:3])

if __name__ == '__main__':
     sortit('testfile.txt')



sort2.py:

#!/usr/bin/python

def sortit(fname):
     fo = open(fname)
     linedict = {}
     for line in fo:
         key = line[:3]
         linedict[key] = line
     sortedlines = []
     keys = linedict.keys()
     keys.sort()
     for key in keys:
         sortedlines.append(linedict[key])
     return sortedlines

if __name__ == '__main__':
     sortit('testfile.txt')


Any idea why? After all, I'm "manually" doing quite a lot: allocating 
key in a dict, then sorting dict's keys, then iterating over keys and 
accessing dict value.

Regards,
mk



From toby at telegraphics.com.au  Wed Mar  3 16:55:58 2010
From: toby at telegraphics.com.au (toby)
Date: Wed, 3 Mar 2010 13:55:58 -0800 (PST)
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
Message-ID: <26bd4a5c-4d66-4597-a0ee-b4990f468e68@g26g2000yqn.googlegroups.com>

On Mar 3, 3:54?pm, ccc31807 <carte... at gmail.com> wrote:
> On Mar 3, 12:36?pm, Xah Lee <xah... at gmail.com> wrote:
>
> > recently i wrote a blog article on The NoSQL Movement
> > athttp://xahlee.org/comp/nosql.html
>
> > i'd like to post it somewhere public to solicit opinions, but in the
> > 20 min or so, i couldn't find a proper newsgroup, nor private list
> > that my somewhat anti-NoSQL Movement article is fitting.
>
> I only read the first two paragraphs of your article, so I can't
> respond to it.
>
> I've halfway followed the NoSQL movement. My day job is a database
> manager and I so SQL databases for a living, as well as Perl. I see a
> lot of abuse of relational databases in the Real World, as well as a
> lot of abuse for non-SQL alternatives, e.g., (mis)using Excel for a
> database. The big, enterprise database we have at work is built on IBM
> UniQuery, which is a non-SQL flat file database product, so I've had a
> lot of experience with big non-SQL database work.
>
> I've also developed a marked preference for plain text databases. For
> a lot of applications they are simpler, easier, and better. I've also
> had some experience with XML databases, and find that they are ideal
> for applications with 'ragged' data.
>
> As with anything else, you need to match the tool to the job. Yes, I
> feel that relational database technology has been much used, and much
> abused. However, one of my favorite applications is Postgres, and I
> think it's absolutely unbeatable

It is beatable outside of its sweetspot, like any system. NoSQL is not
so much about "beating" relational databases, as simply a blanket term
for useful non-relational technologies. There's not much point in
reading Xah beyond the heading of his manifesto, as it is no more
relevant to be "anti-NoSQL" as to be "anti-integers" because they
don't store fractions.

>  where you have to store data and

"relational data"

> perform a large number of queries.

Why does the number matter?

>
> Finally, with regard to Structured Query Language itself, I find that
> it's well suited to its purpose. I hand write a lot of SQL statements
> for various purposes, and while like any language you find it
> exceedingly difficult to express concepts that you can think, it
> mostly allows the expression of most of what you want to say.
>
> CC.



From usenot at geekmail.INVALID  Wed Mar  3 16:58:40 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Wed, 3 Mar 2010 22:58:40 +0100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<eq4l57-okf2.ln1@ozzie.tundraware.com>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <7uu1ooFiipU1@mid.individual.net>
	<4B89D8BE.2040905@mrabarnett.plus.com> <4B8B9845.70604@sequans.com>
	<mailman.59.1267456634.23598.python-list@python.org>
	<7v695nFa0fU1@mid.individual.net>
	<4B8E7538.2080003@mrabarnett.plus.com>
	<20100303111248.7f40d659.darcy@druid.net>
	<hmm7l9$m4f$1@dough.gmane.org> <hmmdrf$fco$1@dough.gmane.org>
	<mailman.244.1267651225.23598.python-list@python.org>
Message-ID: <20100303225840.21bd3108@geekmail.INVALID>

On Wed, 03 Mar 2010 22:19:04 +0100 mk <mrkafk at gmail.com> wrote:

> For the uncouth yobs, err, culturally-challenged:
> 
> http://www.youtube.com/watch?v=Xe1a1wHxTyo
> 
> (Four Yorkshiremen)
> 

http://www.youtube.com/watch?v=-eDaSvRO9xA

That's the definitive version. I mean, if you're going to talk vintage,
talk vintage.

/W


-- 
INVALID? DE!



From vinay_sajip at yahoo.co.uk  Wed Mar  3 16:59:25 2010
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Wed, 3 Mar 2010 13:59:25 -0800 (PST)
Subject: Version 0.3.8 of the Python config module has been released.
Message-ID: <9cc4c234-2c60-4f4e-b059-d8448ea8b8b4@d27g2000yqf.googlegroups.com>

Version 0.3.8 of the Python config module has been released.

What Does It Do?
================
The config module allows you to implement a hierarchical configuration
scheme with support for mappings and sequences, cross-references
between one part of the configuration and another, the ability to
flexibly access real Python objects, facilities for configurations to
include and cross-reference one another, simple expression evaluation
and the ability to change, save, cascade and merge configurations. You
can easily integrate with command line options using optparse.

This module has been developed on python 2.3 but should work on
version 2.2 or greater. A test suite using unittest is included in the
distribution.

A very simple configuration file (simple.cfg):

# starts here
message: Hello, world!
#ends here

a very simple program to use it:

from config import Config

cfg = Config(file('simple.cfg'))
print cfg.message

results in:

Hello, world!

Configuration files are key-value pairs, but the values can be
containers that contain further values.

A simple example - with the example configuration file:

messages:
[
  {
    stream : `sys.stderr`
    message: 'Welcome'
    name: 'Harry'
  }
  {
    stream : `sys.stdout`
    message: 'Welkom'
    name: 'Ruud'
  }
  {
    stream : $messages[0].stream
    message: 'Bienvenue'
    name: Yves
  }
]

a program to read the configuration would be:

from config import Config

f = file('simple.cfg')
cfg = Config(f)
for m in cfg.messages:
    s = '%s, %s' % (m.message, m.name)
    try:
        print >> m.stream, s
    except IOError, e:
        print e

which, when run, would yield the console output:

Welcome, Harry
Welkom, Ruud
Bienvenue, Yves

The above example just scratches the surface. There's more information
about this module available at

http://www.red-dove.com/config-doc/

Comprehensive API documentation is available at

http://www.red-dove.com/config/index.html

As always, your feedback is most welcome (especially bug reports,
patches and suggestions for improvement). Enjoy!

Cheers

Vinay Sajip
Red Dove Consultants Ltd.

Changes since the last release posted on comp.lang.python[.announce]:
=====================================================
Fixed parsing bug which caused failure for negative numbers in
sequences.
Improved resolution logic.


From jgardner at jonathangardner.net  Wed Mar  3 17:16:24 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Wed, 3 Mar 2010 14:16:24 -0800
Subject: Sort Big File Help
In-Reply-To: <374400.23537.qm@web33805.mail.mud.yahoo.com>
References: <374400.23537.qm@web33805.mail.mud.yahoo.com>
Message-ID: <6cc20cea1003031416l2a16a5fdl2199aa379982983e@mail.gmail.com>

On Wed, Mar 3, 2010 at 8:19 AM, John Filben <johnfilben at yahoo.com> wrote:
> I am new to Python but have used many other (mostly dead) languages in the
> past.? I want to be able to process *.txt and *.csv files.? I can now read
> that and then change them as needed ? mostly just take a column and do some
> if-then to create a new variable.? My problem is sorting these files:
>
> 1.)??? How do I sort file1.txt by position and write out file1_sorted.txt;
> for example, if all the records are 100 bytes long and there is a three
> digit id in the position 0-2; here would be some sample data:
>
> a.?????? 001JohnFilben??
>
> b.????? 002Joe? Smith?..
>
> 2.)??? How do I sort file1.csv by column name; for example, if all the
> records have three column headings, ?id?, ?first_name?, ?last_name?; ?here
> would be some sample data:
>
> a.?????? Id, first_name,last_name
>
> b.????? 001,John,Filben
>
> c.?????? 002,Joe, Smith
>
> 3.)??? What about if I have millions of records and I am processing on a
> laptop with a large external drive ? basically, are there space
> considerations? What are the work arounds.
>
> Any help would be appreciated. Thank you.
>

You may also want to look at the GNU tools "sort" and "cut". If your
job is to process files, I'd recommend tools designed to process files
for the task.

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From jgardner at jonathangardner.net  Wed Mar  3 17:17:24 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Wed, 3 Mar 2010 14:17:24 -0800
Subject: Working group for Python CPAN-equivalence?
In-Reply-To: <hmmiks$1ru$1@dough.gmane.org>
References: <mailman.179.1267620332.23598.python-list@python.org>
	<87r5o1v8vp.fsf@benfinney.id.au>
	<4b8e929d$0$1585$742ec2ed@news.sonic.net>
	<hmmiks$1ru$1@dough.gmane.org>
Message-ID: <6cc20cea1003031417i15b66bcdi454bba5a9c642d95@mail.gmail.com>

On Wed, Mar 3, 2010 at 1:00 PM, Terry Reedy <tjreedy at udel.edu> wrote:
>
> People who are familiar with and like CPAN are free to help improve PyPI.
> Those of us not familiar with it may not know what we are missing, or have
> little idea about what works with CPAN.
>


CPAN also covers up some deficiencies in Perl that Python doesn't
suffer from. I am sure we could do well not to replicate those
features.

Regardless, Python's packages are distributed in a number of ways.
PyPI is only one of them. Fedora and Ubuntu are two other ways.

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From jgardner at jonathangardner.net  Wed Mar  3 17:18:00 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Wed, 3 Mar 2010 14:18:00 -0800
Subject: Generic singleton
In-Reply-To: <hmmjad$4gm$1@dough.gmane.org>
References: <mailman.222.1267642515.23598.python-list@python.org>
	<m2iq9d197a.fsf@googlemail.com> <hmmjad$4gm$1@dough.gmane.org>
Message-ID: <6cc20cea1003031418w5ad6f59ah91562243a2cc4afb@mail.gmail.com>

On Wed, Mar 3, 2010 at 1:11 PM, mk <mrkafk at gmail.com> wrote:
>
> Or I could make my life simpler and use global variable. :-)
>

Ding ding ding!

90% of Design Patterns is making Java suck less.

Other languages don't necessarily suffer from Java's design flaws.

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From ben+python at benfinney.id.au  Wed Mar  3 17:21:32 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 04 Mar 2010 09:21:32 +1100
Subject: There should be one-- and preferably only one --obvious way to do
	it
References: <mailman.170.1267608442.23598.python-list@python.org>
	<4b8e621b@dnews.tpgi.com.au>
Message-ID: <87iq9dujv7.fsf@benfinney.id.au>

Lie Ryan <lie.1296 at gmail.com> writes:

> There are lots of reason why bare-except is bad, one being is that it
> makes it way too easy to ignore errors that you don't actually want to
> silence; and given that bare-excepts would prevent Ctrl+C (Interrupt)
> from working. Sorry, but IMHO we shouldn't make syntax sugar for bad
> practices.

Right. Another way I've seen this expressed is ?It should be easy to
do the right thing, and awkward to do the wrong thing?.

-- 
 \       ?Everyone is entitled to their own opinions, but they are not |
  `\            entitled to their own facts.? ?US Senator Pat Moynihan |
_o__)                                                                  |
Ben Finney


From jgardner at jonathangardner.net  Wed Mar  3 17:23:25 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Wed, 3 Mar 2010 14:23:25 -0800
Subject: NoSQL Movement?
In-Reply-To: <fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
Message-ID: <6cc20cea1003031423v4410119dh767610e78ba3eb6e@mail.gmail.com>

On Wed, Mar 3, 2010 at 12:54 PM, ccc31807 <cartercc at gmail.com> wrote:
>
> As with anything else, you need to match the tool to the job. Yes, I
> feel that relational database technology has been much used, and much
> abused. However, one of my favorite applications is Postgres, and I
> think it's absolutely unbeatable where you have to store data and
> perform a large number of queries.
>

Let me elaborate on this point for those who haven't experienced this
for themselves.

When you are starting a new project and you don't have a definitive
picture of what the data is going to look like or how it is going to
be queried, SQL databases (like PostgreSQL) will help you quickly
formalize and understand what your data needs to do. In this role,
these databases are invaluable. I can see no comparable tool in the
wild, especially not OODBMS.

As you grow in scale, you may eventually reach a point where the
database can't keep up with you. Either you need to partition the data
across machines or you need more specialized and optimized query
plans. When you reach that point, there are a number of options that
don't include an SQL database. I would expect your project to move
those parts of the data away from an SQL database and towards a more
specific solution.

I see it as a sign of maturity with sufficiently scaled software that
they no longer use an SQL database to manage their data. At some point
in the project's lifetime, the data is understood well enough that the
general nature of the SQL database is unnecessary.

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From ben+python at benfinney.id.au  Wed Mar  3 17:30:35 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 04 Mar 2010 09:30:35 +1100
Subject: Working group for Python CPAN-equivalence?
References: <mailman.179.1267620332.23598.python-list@python.org>
	<87r5o1v8vp.fsf@benfinney.id.au>
	<4b8e929d$0$1585$742ec2ed@news.sonic.net>
	<mailman.239.1267650035.23598.python-list@python.org>
Message-ID: <87eik1ujg4.fsf@benfinney.id.au>

Terry Reedy <tjreedy at udel.edu> writes:

> On 3/3/2010 12:05 PM, John Nagle wrote:
> > CPAN is a repository. PyPi is an collection of links.
>
> As Ben said, PyPI currently is also a respository and not just links
> to other repositories.

It's a repository with holes. Just because a package is registered is no
indication that the package is available from PyPI.

> > CPAN has over 260 mirrors. PyPi has none.
>
> A mirroring system has been or is being set up with at least a couple
> of mirrors for things that are hosted at PyPI.

And that caveat is a big problem. Since PyPI allows registration of
packages that are not themselves hosted at PyPI (often because their
license terms are too restrictive for PyPI to redistribute the work),
the mirror system will miss them.

So there will be package-shaped holes in the PyPI mirror, meaning that
even well-specified dependencies and a reliable mirror network will not
be enough to make dependencies reliably satisfiable.

> > CPAN enforces standard organization on packages. PyPi does not.

This is, I think, something we don't need as much in Python; there is a
fundamental difference between Perl's deeply nested namespace hierarchy
and Python's inherently flat hierarchy.

> > CPAN has quality control, with testers and a test reporting system.
> > PyPi does not.
>
> People who are familiar with and like CPAN are free to help improve
> PyPI. Those of us not familiar with it may not know what we are
> missing, or have little idea about what works with CPAN.

An important first step would be to reject from PyPI any package that
isn't available for automated testing on the servers. That requires,
AFAICT, rejecting any package without the source package uploaded.

-- 
 \     ?Oh, I realize it's a penny here and a penny there, but look at |
  `\      me: I've worked myself up from nothing to a state of extreme |
_o__)                                          poverty.? ?Groucho Marx |
Ben Finney


From ben+python at benfinney.id.au  Wed Mar  3 17:32:21 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 04 Mar 2010 09:32:21 +1100
Subject: cpan for python?
References: <mailman.20.1267367545.23598.python-list@python.org>
	<hmjv4b$mqk$1@reader1.panix.com>
	<2010030214473616807-tomfsessile@gmailcom>
	<4b8ddea4$1@dnews.tpgi.com.au> <87ljea9f20.fsf@castleamber.com>
	<45b1599f-a05b-4132-9e75-89a52757e71b@q21g2000yqm.googlegroups.com>
	<877hpt46yw.fsf@castleamber.com>
Message-ID: <87aaupujd6.fsf@benfinney.id.au>

John Bokma <john at castleamber.com> writes:

> I want to remove something that I installed [with its Distutils build
> system] (because it's installation procedure seems to be broken;
> opensocial) I understand that this can't be blamed on pip, but it's
> odd that in this century it's still hard to install/uninstall modules
> :-(

That's because of the last-century legacy of Distutils's design.

-- 
 \       ?Imagine a world without hypothetical situations.? ?anonymous |
  `\                                                                   |
_o__)                                                                  |
Ben Finney


From peter at www.pjb.com.au  Wed Mar  3 17:37:02 2010
From: peter at www.pjb.com.au (Peter Billam)
Date: 03 Mar 2010 22:37:02 GMT
Subject: Working group for Python CPAN-equivalence?
References: <mailman.179.1267620332.23598.python-list@python.org>
	<87r5o1v8vp.fsf@benfinney.id.au>
	<4b8e929d$0$1585$742ec2ed@news.sonic.net>
Message-ID: <slrnhotp4e.26k.peter@box8.pjb.com.au>

On 2010-03-03, John Nagle <nagle at animats.com> wrote:
> Ben Finney wrote:
>> Olof Bjarnason <olof.bjarnason at gmail.com> writes:
>>> The "Where is CPAN for Python?" question keeps popping up, with
>>> answers ranging from "There is no CPAN for Python" and "We already
>>> have CPAN for Python" (confusing).
>> 
>> Caused in no small measure by the fact that Perl people mean at
>> least two distinct things by ?Where is CPAN for Python??:
>> * The central package registry, CPAN, with metadata in a standard
>>   queryable format, and all registered packages redundantly mirrored
>>   and available for installation at user-specified versions.
>>   We have an equivalent in PyPI, though it's incomplete since
>>   many *registered* packages are not actually hosted *at* PyPI.
>
>     CPAN is a repository.   PyPi is an collection of links.
>     CPAN has over 260 mirrors.  PyPi has none.
>     CPAN enforces standard organization on packages.  PyPi does not.
>     CPAN has quality control, with testers and a test reporting system.
>     PyPi does not.

One important thing that CPAN does _not_ have is a formalised
"I put this module up for adoption" mechanism.  Debian has one,
for example.  It's necessary, because not having one leads to
many (in the long run, all) modules becoming unmaintained and
abandoned, even though they worked perfectly well and were very
useful to people...

It would also be nice to be able to get module download stats.

A very important thing about CPAN modules is the consistent
basic install method:   perl Makefile.PL ; make ; make install

I'm not sure if the Perl code that runs CPAN is free software... (?)

Regards,  (CPAN author)  Peter

-- 
Peter Billam       www.pjb.com.au    www.pjb.com.au/comp/contact.html


From philip at semanchuk.com  Wed Mar  3 17:40:36 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Wed, 3 Mar 2010 17:40:36 -0500
Subject: taking python enterprise level?...
In-Reply-To: <hmmih7$1bs$1@dough.gmane.org>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>	<20100302015813.5397655e.darcy@druid.net>	<hmm2jc$28u$1@dough.gmane.org>
	<973824D8-3020-44A8-B2DA-501FF530457B@semanchuk.com>
	<hmmih7$1bs$1@dough.gmane.org>
Message-ID: <0C9B223A-D32A-474C-80E3-7F912447170F@semanchuk.com>


On Mar 3, 2010, at 3:58 PM, mk wrote:

> Philip Semanchuk wrote:
>>> So there *may* be some evidence that joins are indeed bad in  
>>> practice. If someone has smth specific/interesting on the subject,  
>>> please post.
>> It's an unprovable assertion, or a meaningless one depending on how  
>> one defines the terms. You could also say "there *may* be some  
>> evidence that Python lists are bad in practice". Python lists and  
>> SQL JOINs are like any part of a language or toolkit. They're good  
>> tools for solving certain classes of problems. They can also be  
>> misapplied to problems that they're not so good at. Sometimes  
>> they're a performance bottleneck, even when solving the problems  
>> for which they're best. Sometimes the best way to solve a  
>> performance bottleneck is to redesign your app/system so you don't  
>> need to solve that kind of problem anymore (hence the join-less  
>> databases). Other times, the cure is worse than the disease and  
>> you're better off throwing hardware at the problem.
>
> Look, I completely agree with what you're saying, but: that doesn't  
> change the possibility that joins may be expensive in comparison to  
> other SQL operations. This is the phrase I should have used perhaps;  
> 'expensive in comparison with other SQL operations' instead of 'bad'.

Well OK, but that's a very different argument. Yes, joins can be  
expensive. They're often still the best option, though. The first step  
people usually take to get away from joins is denormalization which  
can improve SELECT performance at the expense of slowing down INSERTs,  
UPDATEs, and DELETEs, not to mention complicating one's code and data  
model. Is that a worthwhile trade? Depends on the application. As I  
said, sometimes the cure is worse than the disease.

Don't worry about joins until you know they're a problem. As Knuth  
said, premature optimization is the root of all evil.

Good luck
Philip

PS - Looks like you're using Postgres -- excellent choice. I miss  
using it.




From me at privacy.net  Wed Mar  3 17:41:37 2010
From: me at privacy.net (Avid Fan)
Date: Wed, 03 Mar 2010 22:41:37 GMT
Subject: NoSQL Movement?
In-Reply-To: <mailman.256.1267655008.23598.python-list@python.org>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<mailman.256.1267655008.23598.python-list@python.org>
Message-ID: <BABjn.11012$pv.4575@news-server.bigpond.net.au>

Jonathan Gardner wrote:

> 
> I see it as a sign of maturity with sufficiently scaled software that
> they no longer use an SQL database to manage their data. At some point
> in the project's lifetime, the data is understood well enough that the
> general nature of the SQL database is unnecessary.
> 

I am really struggling to understand this concept.

Is it the normalised table structure that is in question or the query 
language?

Could you give some sort of example of where SQL would not be the way to 
go.   The only things I can think of a simple flat file databases.


From drobinow at gmail.com  Wed Mar  3 18:16:47 2010
From: drobinow at gmail.com (David Robinow)
Date: Wed, 3 Mar 2010 18:16:47 -0500
Subject: Docstrings considered too complicated
In-Reply-To: <hmmf8k$5vl$1@reader1.panix.com>
References: <20100303114603.7021e9ba.darcy@druid.net>
	<539252.91463.qm@web58904.mail.re1.yahoo.com>
	<mailman.230.1267645508.23598.python-list@python.org>
	<hmmf8k$5vl$1@reader1.panix.com>
Message-ID: <4eb0089f1003031516u473ce06ejb705feb85ece66a7@mail.gmail.com>

On Wed, Mar 3, 2010 at 3:02 PM, Grant Edwards <invalid at invalid.invalid> wrote:
> On 2010-03-03, mk <mrkafk at gmail.com> wrote:
>
>>> That has always puzzled me to. ETX and EOT were well established, why
>>> no use one of them? I'd love to know what they were thinking.
>>
>> Probably nothing: what many people do with confronted with a problem.
>>
>> It reminds me of why Windows uses backslashes for path separation
>> instead of slashes: what I've *heard*, and do not know if it's true,
>> it's because Gates fancied using / for options switch instead of -,
>> and to hell with established practice.
>
> Using / for the option switch _was_ the established practice (if you
> came from a DEC background the way that CP/M and DOS did).
Quite true. And the early DEC systems predated Unix (although not by much)


From jml at mumak.net  Wed Mar  3 18:25:36 2010
From: jml at mumak.net (Jonathan Lange)
Date: Wed, 3 Mar 2010 23:25:36 +0000
Subject: Twisted 10.0.0 released
Message-ID: <d06a5cd31003031525h33ea08b4k4c4a2aff0e7c7fe8@mail.gmail.com>

On behalf of Twisted Matrix Laboratories, I am honored to announce the
release of Twisted 10.0.

Highlights include:

 * Improved documentation, including "Twisted Web in 60 seconds"

 * Faster Perspective Broker applications

 * A new Windows installer that ships without zope.interface

 * Twisted no longer supports Python 2.3

 * Over one hundred closed tickets

For more information, see the NEWS file.

It's stable, backwards compatible, well tested and in every way an
improvement. Download it now from:

 http://tmrc.mit.edu/mirror/twisted/Twisted/10.0/Twisted-10.0.0.tar.bz2 or
 http://tmrc.mit.edu/mirror/twisted/Twisted/10.0/Twisted-10.0.0.win32-py2.5.msi

Many thanks to Jean-Paul Calderone and Chris Armstrong, whose work on
release automation tools and answers to numerous questions made this
possible. Thanks also to the supporters of the Twisted Software
Foundation and to the many contributors for this release.

jml


From robert.kern at gmail.com  Wed Mar  3 18:28:35 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 03 Mar 2010 17:28:35 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <hmmkmh$mt1$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>
	<hmmkmh$mt1$1@news.eternal-september.org>
Message-ID: <hmmrb3$e4$1@dough.gmane.org>

On 2010-03-03 15:35 PM, Alf P. Steinbach wrote:
> * Robert Kern:
>> On 2010-03-03 13:32 PM, Alf P. Steinbach wrote:
>>> * Robert Kern:
>>>> On 2010-03-03 11:18 AM, Alf P. Steinbach wrote:
>>>>> * Robert Kern:
>>>>>> On 2010-03-03 09:56 AM, Alf P. Steinbach wrote:
>>>>>>> * Mike Kent:
>>>>>>>> What's the compelling use case for this vs. a simple try/finally?
>>>>>>>
>>>>>>> if you thought about it you would mean a simple "try/else".
>>>>>>> "finally" is
>>>>>>> always executed. which is incorrect for cleanup
>>>>>>
>>>>>> Eh? Failed execution doesn't require cleanup? The example you gave is
>>>>>> definitely equivalent to the try: finally: that Mike posted.
>>>>>
>>>>> Sorry, that's incorrect: it's not.
>>>>>
>>>>> With correct code (mine) cleanup for action A is only performed when
>>>>> action A succeeds.
>>>>>
>>>>> With incorrect code cleanup for action A is performed when A fails.
>>>>
>>>> Oh?
>>>>
>>>> $ cat cleanup.py
>>>>
>>>> class Cleanup:
>>>> def __init__( self ):
>>>> self._actions = []
>>>>
>>>> def call( self, action ):
>>>> assert( callable( action ) )
>>>> self._actions.append( action )
>>>>
>>>> def __enter__( self ):
>>>> return self
>>>>
>>>> def __exit__( self, x_type, x_value, x_traceback ):
>>>> while( len( self._actions ) != 0 ):
>>>> try:
>>>> self._actions.pop()()
>>>> except BaseException as x:
>>>> raise AssertionError( "Cleanup: exception during cleanup" )
>>>>
>>>> def print_(x):
>>>> print x
>>>>
>>>> with Cleanup() as at_cleanup:
>>>> at_cleanup.call(lambda: print_("Cleanup executed without an
>>>> exception."))
>>>>
>>>> with Cleanup() as at_cleanup:
>>>
>>> *Here* is where you should
>>>
>>> 1) Perform the action for which cleanup is needed.
>>>
>>> 2) Let it fail by raising an exception.
>>>
>>>
>>>> at_cleanup.call(lambda: print_("Cleanup execute with an exception."))
>>>> raise RuntimeError()
>>>
>>> With an exception raised here cleanup should of course be performed.
>>>
>>> And just in case you didn't notice: the above is not a test of the
>>> example I gave.
>>>
>>>
>>>> $ python cleanup.py
>>>> Cleanup executed without an exception.
>>>> Cleanup execute with an exception.
>>>> Traceback (most recent call last):
>>>> File "cleanup.py", line 28, in <module>
>>>> raise RuntimeError()
>>>> RuntimeError
>>>>
>>>>>> The actions are always executed in your example,
>>>>>
>>>>> Sorry, that's incorrect.
>>>>
>>>> Looks like it to me.
>>>
>>> I'm sorry, but you're
>>>
>>> 1) not testing my example which you're claiming that you're testing, and
>>
>> Then I would appreciate your writing a complete, runnable example that
>> demonstrates the feature you are claiming. Because it's apparently not
>> "ensur[ing] some desired cleanup at the end of a scope, even when the
>> scope is exited via an exception" that you talked about in your
>> original post.
>>
>> Your sketch of an example looks like mine:
>>
>> with Cleanup as at_cleanup:
>> # blah blah
>> chdir( somewhere )
>> at_cleanup.call( lambda: chdir( original_dir ) )
>> # blah blah
>>
>> The cleanup function gets registered immediately after the first
>> chdir() and before the second "blah blah". Even if an exception is
>> raised in the second "blah blah", then the cleanup function will still
>> run. This would be equivalent to a try: finally:
>>
>> # blah blah #1
>> chdir( somewhere )
>> try:
>> # blah blah #2
>> finally:
>> chdir( original_dir )
>
> Yes, this is equivalent code.
>
> The try-finally that you earlier claimed was equivalent, was not.

Okay, but just because of the position of the chdir(), right?

>> and not a try: else:
>>
>> # blah blah #1
>> chdir( somewhere )
>> try:
>> # blah blah #2
>> else:
>> chdir( original_dir )
>
> This example is however meaningless except as misdirection. There are
> infinitely many constructs that include try-finally and try-else, that
> the with-Cleanup code is not equivalent to. It's dumb to show one such.
>
> Exactly what are you trying to prove here?

I'm just showing you what I thought you meant when you told Mike that he should 
have used a try/else instead of try/finally.

> Your earlier claims are still incorrect.
>
>> Now, I assumed that the behavior with respect to exceptions occurring
>> in the first "blah blah" weren't what you were talking about because
>> until the chdir(), there is nothing to clean up.
>>
>> There is no way that the example you gave translates to a try: else:
>> as you claimed in your response to Mike Kent.
>
> Of course there is.
>
> Note that Mike wrapped the action A within the 'try':
>
>
> <code author="Mike" correct="False">
> original_dir = os.getcwd()
> try:
> os.chdir(somewhere)
> # Do other stuff
> finally:
> os.chdir(original_dir)
> # Do other cleanup
> </code>
>
>
> The 'finally' he used, shown above, yields incorrect behavior.
>
> Namely cleanup always, while 'else', in that code, can yield correct
> behavior /provided/ that it's coded correctly:
>
>
> <code author="Alf" correct="ProbablyTrue" disclaimer="off the cuff">
> original_dir = os.getcwd()
> try:
> os.chdir(somewhere)
> except Whatever:
> # whatever, e.g. logging
> raise
> else:
> try:
> # Do other stuff
> finally:
> os.chdir(original_dir)
> # Do other cleanup
> </code>

Ah, okay. Now we're getting somewhere. Now, please note that you did not have 
any except: handling in your original example. So Mike made a try: finally: 
example to attempt to match the semantics of your code. When you tell him that 
he should 'mean a simple "try/else". "finally" is always executed. which is 
incorrect for cleanup', can you understand why we might think that you were 
saying that try: finally: was wrong and that you were proposing that your code 
was equivalent to some try: except: else: suite?

>>> 2) not even showing anything about your earlier statements, which were
>>> just incorrect.
>>>
>>> You're instead showing that my code works as it should for the case that
>>> you're testing, which is a bit unnecessary since I knew that, but thanks
>>> anyway.
>>
>> It's the case you seem to be talking about in your original post.
>
> What's this "seems"? Are you unable to read that very short post?

I say "seems" because my understandings of what you meant in your original post 
and your response to Mike disagreed with one another. Now I see that your later 
posts were talking about minor discrepancy about which errors you wanted caught 
by the finally: and which you didn't. I was confused because it seemed that you 
were saying that try: finally: was completely wrong and that "try/else" was 
right. It confused me and at least one other person.

>> , but I do ask you to acknowledge that you originally were talking
>> about a feature that "ensure[s] some desired cleanup at the end of a
>> scope, even when the scope is exited via an exception."
>
> Yes, that's what it does.
>
> Which is I why I wrote that.
>
> This should not be hard to grok.
>
>
>> Do you acknowledge this?
>
> This seems like pure noise, to cover up that you were sputing a lot of
> incorrect statements earlier.

No, I'm just trying to clarify what you are trying to say. The above statement 
did not appear to accord with your later statement: 'if you thought about it you 
would mean a simple "try/else". "finally" is always executed. which is incorrect 
for cleanup.' It turns out that what you really meant was that it would be 
incorrect for cleanup to be executed when an error occurred in the chdir() itself.

Now, I happen to disagree with that. There are a couple of ways to do this kind 
of cleanup depending on the situation. Basically, you have several different 
code blocks:

# 1. Record original state.
# 2. Modify state.
# 3. Do stuff requiring the modified state.
# 4. Revert to the original state.

Depending on where errors are expected to occur, and how the state needs to get 
modified and restored, there are different ways of arranging these blocks. The 
one Mike showed:

# 1. Record original state.
try:
     # 2. Modify state.
     # 3. Do stuff requiring the modified state.
finally:
     # 4. Revert to the original state.

And the one you prefer:

# 1. Record original state.
# 2. Modify state.
try:
     # 3. Do stuff requiring the modified state.
finally:
     # 4. Revert to the original state.

These differ in what happens when an error occurs in block #2, the modification 
of the state. In Mike's, the cleanup code runs; in yours, it doesn't. For 
chdir(), it really doesn't matter. Reverting to the original state is harmless 
whether the original chdir() succeeds or fails, and chdir() is essentially 
atomic so if it raises an exception, the state did not change and nothing needs 
to be cleaned up.

However, not all block #2s are atomic. Some are going to fail partway through 
and need to be cleaned up even though they raised an exception. Fortunately, 
cleanup can frequently be written to not care whether the whole thing finished 
or not.

Both formulations can be correct (and both work perfectly fine with the chdir() 
example being used). Sometimes one is better than the other, and sometimes not. 
You can achieve both ways with either your Cleanup class or with try: finally:.

I am still of the opinion that Cleanup is not an improvement over try: finally: 
and has the significant ugliness of forcing cleanup code into callables. This 
significantly limits what you can do in your cleanup code.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From eike.welk at gmx.net  Wed Mar  3 18:33:29 2010
From: eike.welk at gmx.net (Eike Welk)
Date: Thu, 04 Mar 2010 00:33:29 +0100
Subject: Method / Functions - What are the differences?
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
	<mailman.109.1267539415.23598.python-list@python.org>
	<hmk1mn$70u$1@newsreader3.netcologne.de>
	<4b8e4041$0$17447$426a34cc@news.free.fr>
	<hmlte9$d0f$1@dough.gmane.org>
	<mailman.205.1267633968.23598.python-list@python.org>
	<4b8e9660$0$21812$426a34cc@news.free.fr>
Message-ID: <hmmrh4$644$1@newsreader3.netcologne.de>

Bruno Desthuilliers wrote:
> John Posner a ?crit :
>> Done -- see http://wiki.python.org/moin/FromFunctionToMethod
> 
> Done and well done !-)
> Thanks again for the good job John.

I like it too, thanks to both of you!

I have two small ideas for improvement: 
- Swap the first two paragraphs. First say what it is, and then give the 
motivation.
- The section about the descriptor protocol is a bit difficult to 
understand. But judging from the official descriptor documentation, it seems 
to be hard to explain: The official documentation is nearly incomprehensible 
(IMHO).
 


From philip at semanchuk.com  Wed Mar  3 18:43:30 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Wed, 3 Mar 2010 18:43:30 -0500
Subject: Working group for Python CPAN-equivalence?
In-Reply-To: <6cc20cea1003031417i15b66bcdi454bba5a9c642d95@mail.gmail.com>
References: <mailman.179.1267620332.23598.python-list@python.org>
	<87r5o1v8vp.fsf@benfinney.id.au>
	<4b8e929d$0$1585$742ec2ed@news.sonic.net>
	<hmmiks$1ru$1@dough.gmane.org>
	<6cc20cea1003031417i15b66bcdi454bba5a9c642d95@mail.gmail.com>
Message-ID: <882E7C2F-08E5-491A-A74C-572E37F333D1@semanchuk.com>


On Mar 3, 2010, at 5:17 PM, Jonathan Gardner wrote:

> On Wed, Mar 3, 2010 at 1:00 PM, Terry Reedy <tjreedy at udel.edu> wrote:
>>
>> People who are familiar with and like CPAN are free to help improve  
>> PyPI.
>> Those of us not familiar with it may not know what we are missing,  
>> or have
>> little idea about what works with CPAN.
>>
>
>
> CPAN also covers up some deficiencies in Perl that Python doesn't
> suffer from. I am sure we could do well not to replicate those
> features.
>
> Regardless, Python's packages are distributed in a number of ways.
> PyPI is only one of them. Fedora and Ubuntu are two other ways.

Do Fedora & Ubuntu's package managers offer modules that appear in  
CPAN? In other words, if I was a Perl user under Ubuntu would I use  
the pkg manager to add a Perl module, or CPAN, or would both work?


Thanks
Philip



From thewellsoliver at gmail.com  Wed Mar  3 18:45:51 2010
From: thewellsoliver at gmail.com (Wells)
Date: Wed, 3 Mar 2010 15:45:51 -0800 (PST)
Subject: Question about typing: ints/floats
Message-ID: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>

This seems sort of odd to me:

>>> a = 1
>>> a += 1.202
>>> a
2.202

Indicates that 'a' was an int that was implicitly casted to a float.
But:

>>> a = 1
>>> b = 3
>>> a / b
0

This does not implicitly do the casting, it treats 'a' and 'b' as
integers, and the result as well. Changing 'b' to 3.0 will yield a
float as a result (0.33333333333333331)

Is there some way to explain the consistency here? Does python
implicitly change the casting when you add variables of a different
numeric type?

Anyway, just  curiosity more than anything else. Thanks!


From zeeshan.quireshi at gmail.com  Wed Mar  3 18:50:19 2010
From: zeeshan.quireshi at gmail.com (Zeeshan Quireshi)
Date: Wed, 3 Mar 2010 15:50:19 -0800 (PST)
Subject: Passing FILE * types using ctypes
Message-ID: <a83319d7-c199-4532-9816-d002f7fd7914@q16g2000yqq.googlegroups.com>

Hello, I'm using ctypes to wrap a library i wrote. I am trying to pass
it a FILE *pointer, how do i open a file in Python and convert it to a
FILE *pointer. Or do i have to call the C library using ctypes first,
get the pointer and then pass it to my function.

Also, is there any automated way to convert c struct and enum
definitions to ctypes data types.

Zeeshan


From zeeshan.quireshi at gmail.com  Wed Mar  3 18:53:27 2010
From: zeeshan.quireshi at gmail.com (Zeeshan Quireshi)
Date: Wed, 3 Mar 2010 15:53:27 -0800 (PST)
Subject: Question about typing: ints/floats
References: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
Message-ID: <b800048f-b09e-4c39-bf15-9bcd3dae11bc@y11g2000yqh.googlegroups.com>

On Mar 3, 6:45?pm, Wells <thewellsoli... at gmail.com> wrote:
> This seems sort of odd to me:
>
> >>> a = 1
> >>> a += 1.202
> >>> a
>
> 2.202
>
> Indicates that 'a' was an int that was implicitly casted to a float.
> But:
>
> >>> a = 1
> >>> b = 3
> >>> a / b
>
> 0
>
> This does not implicitly do the casting, it treats 'a' and 'b' as
> integers, and the result as well. Changing 'b' to 3.0 will yield a
> float as a result (0.33333333333333331)
>
> Is there some way to explain the consistency here? Does python
> implicitly change the casting when you add variables of a different
> numeric type?
>
> Anyway, just ?curiosity more than anything else. Thanks!

Python, like most other languages performs only integer division when
both the operands are ints. So only if one of the types is a flot or
you explicitly cast your expression to be a double, then the value
will be a fraction. otherwise you will the quotient.


From rhodri at wildebst.demon.co.uk  Wed Mar  3 18:56:00 2010
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 03 Mar 2010 23:56:00 -0000
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<eq4l57-okf2.ln1@ozzie.tundraware.com>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <7uu1ooFiipU1@mid.individual.net>
	<4B89D8BE.2040905@mrabarnett.plus.com> <4B8B9845.70604@sequans.com>
	<mailman.59.1267456634.23598.python-list@python.org>
	<7v695nFa0fU1@mid.individual.net>
	<4B8E7538.2080003@mrabarnett.plus.com>
	<20100303111248.7f40d659.darcy@druid.net>
	<hmm7l9$m4f$1@dough.gmane.org>
	<mailman.228.1267645124.23598.python-list@python.org>
Message-ID: <op.u80nfmlca8ncjz@gnudebst>

On Wed, 03 Mar 2010 19:38:16 -0000, Steve Holden <steve at holdenweb.com>  
wrote:

> mk wrote:
>> D'Arcy J.M. Cain wrote:
>>
>>> Makes me want to go down to the basement and fire up the Altair.  :-)
>>
>> Please don't, or else I fire up that univ Yugoslavian copy of VAX with
>> Pascal compiler (where I wrote my first program) and I will start my
>> first program of ping-pong.
>>
>> It was a few hundred lines but took 5 minutes to compile; "VAX" was
>> theoretically multitasking, but when more than 3 people were trying to
>> do smth on it simultaneously, it was basically seizing up.
>>
>> Regards,
>> mk
>>
> Puts me in mind of Mario Wolczko's early attempts to implement SmallTalk
> on a VAX 11/750. The only bitmapped display we had available was a Three
> Rivers PERQ, connected by a 9600bps serial line. We left it running at
> seven o'clock one evening, and by nine am the next day it had brought up
> about two thirds of the initial VM loader screen ...
>
> You tell these young kids, and they just don't believe you!

There's old, and then there's old.  http://sms.cam.ac.uk/media/739532 is a  
film of EDSAC being programmed in 1951, with a commentary added by Maurice  
Wilkes in 1976.  Maybe just a bit before my time (by a decade or so :-)

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


From jjposner at optimum.net  Wed Mar  3 18:56:07 2010
From: jjposner at optimum.net (John Posner)
Date: Wed, 03 Mar 2010 18:56:07 -0500
Subject: Method / Functions - What are the differences?
In-Reply-To: <hmmrh4$644$1@newsreader3.netcologne.de>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
	<mailman.109.1267539415.23598.python-list@python.org>
	<hmk1mn$70u$1@newsreader3.netcologne.de>
	<4b8e4041$0$17447$426a34cc@news.free.fr>
	<hmlte9$d0f$1@dough.gmane.org>
	<mailman.205.1267633968.23598.python-list@python.org>
	<4b8e9660$0$21812$426a34cc@news.free.fr>
	<hmmrh4$644$1@newsreader3.netcologne.de>
Message-ID: <4B8EF717.3070701@optimum.net>

On 3/3/2010 6:33 PM, Eike Welk wrote:
>
> I have two small ideas for improvement:
> - Swap the first two paragraphs. First say what it is, and then give the
> motivation.

No problem -- since this is a Wiki, you can perform the swap yourself! 
(If you haven't done it in a day or so, I'll do the deed.)

> - The section about the descriptor protocol is a bit difficult to
> understand. But judging from the official descriptor documentation, it seems
> to be hard to explain: The official documentation is nearly incomprehensible
> (IMHO).

I empathize -- it took me a while to grok descriptors. I was thinking 
today about "doing a Bruno", and producing similar pieces on:

* properties created with the @property decorator

* the descriptor protocol

I'll try to produce something over the next couple of days.

-John


From jgardner at jonathangardner.net  Wed Mar  3 19:10:14 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Wed, 3 Mar 2010 16:10:14 -0800
Subject: PYTHONPATH and eggs
In-Reply-To: <86ee3b75-b3f5-4172-90c8-e90f0e50b89f@a18g2000yqc.googlegroups.com>
References: <86ee3b75-b3f5-4172-90c8-e90f0e50b89f@a18g2000yqc.googlegroups.com>
Message-ID: <6cc20cea1003031610i6f79fd4fndac249ba27ca44c6@mail.gmail.com>

On Wed, Mar 3, 2010 at 2:14 AM, geoffbache <geoff.bache at jeppesen.com> wrote:
>
> I have a very simple problem that seems to have no simple solution.
>
> I have a module which is installed centrally and lives in a Python
> egg. I have experimented with some minor changes to it and would like
> to set my PYTHONPATH to pick up my local copy of it, but don't want to
> have to figure out how to build my own version of the "egg" if
> possible.
>
> Unfortunately, the location from PYTHONPATH ends up after the eggs in
> sys.path so I can't persuade Python to import my version. The only way
> I've found to fix it is to copy the main script and manually hack
> sys.path at the start of it which isn't really very nice. I wonder if
> there is any better way as I can't be the first person to want to do
> this, surely?
>
> I've seen this issue has been discussed elsewhere and flagged as a
> problem (e.g.
> http://mail.python.org/pipermail/distutils-sig/2009-January/010755.html)
>
> but I've been unable to find any suggestions for workarounds or
> indications whether this will be/has been fixed.
>

Sounds like you might need to use virtualenv to setup python
environments that you can control.

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From rhodri at wildebst.demon.co.uk  Wed Mar  3 19:11:26 2010
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Thu, 04 Mar 2010 00:11:26 -0000
Subject: Interest check in some delicious syntactic sugar for "except:pass"
References: <mailman.170.1267608442.23598.python-list@python.org>
Message-ID: <op.u80n5cq4a8ncjz@gnudebst>

On Wed, 03 Mar 2010 09:27:16 -0000, Oren Elrad <orenelrad at gmail.com> wrote:

> Howdy all, longtime appreciative user, first time mailer-inner.
> I'm wondering if there is any support (tepid better than none) for the
> following syntactic sugar:
> silence:
> ........ block
> ------------------------->
> try:
> ........block
> except:
> ........pass

-100

This catches Control-C interrupts, sys.exit(), subtle typos in the code,  
and sundry other errors that actually you *did* want to know about.   
Silence isn't so much golden as pyritic.

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


From mensanator at aol.com  Wed Mar  3 19:27:50 2010
From: mensanator at aol.com (Mensanator)
Date: Wed, 3 Mar 2010 16:27:50 -0800 (PST)
Subject: Question about typing: ints/floats
References: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
Message-ID: <b88bceed-bbd1-4e40-85b6-206cd5569674@e7g2000yqf.googlegroups.com>

On Mar 3, 5:45?pm, Wells <thewellsoli... at gmail.com> wrote:
> This seems sort of odd to me:
>
> >>> a = 1
> >>> a += 1.202
> >>> a
>
> 2.202
>
> Indicates that 'a' was an int that was implicitly casted to a float.
> But:
>
> >>> a = 1
> >>> b = 3
> >>> a / b
>
> 0
>
> This does not implicitly do the casting, it treats 'a' and 'b' as
> integers, and the result as well.

Not in Python 3.1:
Python 3.1 (r31:73574, Jun 26 2009, 20:21:35) [MSC v.1500 32 bit
(Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> a = 1
>>> b = 3
>>> a/b
0.3333333333333333



> Changing 'b' to 3.0 will yield a
> float as a result (0.33333333333333331)
>
> Is there some way to explain the consistency here?

Yes, use Python 3.1.

> Does python
> implicitly change the casting when you add variables of a different
> numeric type?

Sometimes. Floats and ints are compatible. But this doesn't work:

>>> '3' + 1
Traceback (most recent call last):
  File "<pyshell#4>", line 1, in <module>
    '3' + 1
TypeError: Can't convert 'int' object to str implicitly


>
> Anyway, just ?curiosity more than anything else. Thanks!



From alfps at start.no  Wed Mar  3 19:49:45 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Thu, 04 Mar 2010 01:49:45 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.260.1267658935.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>
	<mailman.260.1267658935.23598.python-list@python.org>
Message-ID: <hmn03d$5r6$1@news.eternal-september.org>

* Robert Kern:
> On 2010-03-03 15:35 PM, Alf P. Steinbach wrote:
>> * Robert Kern:
>>> On 2010-03-03 13:32 PM, Alf P. Steinbach wrote:
>>>> * Robert Kern:
>>>>> On 2010-03-03 11:18 AM, Alf P. Steinbach wrote:
>>>>>> * Robert Kern:
>>>>>>> On 2010-03-03 09:56 AM, Alf P. Steinbach wrote:
>>>>>>>> * Mike Kent:
>>>>>>>>> What's the compelling use case for this vs. a simple try/finally?
>>>>>>>>
>>>>>>>> if you thought about it you would mean a simple "try/else".
>>>>>>>> "finally" is
>>>>>>>> always executed. which is incorrect for cleanup
>>>>>>>
>>>>>>> Eh? Failed execution doesn't require cleanup? The example you 
>>>>>>> gave is
>>>>>>> definitely equivalent to the try: finally: that Mike posted.
>>>>>>
>>>>>> Sorry, that's incorrect: it's not.
>>>>>>
>>>>>> With correct code (mine) cleanup for action A is only performed when
>>>>>> action A succeeds.
>>>>>>
>>>>>> With incorrect code cleanup for action A is performed when A fails.
>>>>>
>>>>> Oh?
>>>>>
>>>>> $ cat cleanup.py
>>>>>
>>>>> class Cleanup:
>>>>> def __init__( self ):
>>>>> self._actions = []
>>>>>
>>>>> def call( self, action ):
>>>>> assert( callable( action ) )
>>>>> self._actions.append( action )
>>>>>
>>>>> def __enter__( self ):
>>>>> return self
>>>>>
>>>>> def __exit__( self, x_type, x_value, x_traceback ):
>>>>> while( len( self._actions ) != 0 ):
>>>>> try:
>>>>> self._actions.pop()()
>>>>> except BaseException as x:
>>>>> raise AssertionError( "Cleanup: exception during cleanup" )
>>>>>
>>>>> def print_(x):
>>>>> print x
>>>>>
>>>>> with Cleanup() as at_cleanup:
>>>>> at_cleanup.call(lambda: print_("Cleanup executed without an
>>>>> exception."))
>>>>>
>>>>> with Cleanup() as at_cleanup:
>>>>
>>>> *Here* is where you should
>>>>
>>>> 1) Perform the action for which cleanup is needed.
>>>>
>>>> 2) Let it fail by raising an exception.
>>>>
>>>>
>>>>> at_cleanup.call(lambda: print_("Cleanup execute with an exception."))
>>>>> raise RuntimeError()
>>>>
>>>> With an exception raised here cleanup should of course be performed.
>>>>
>>>> And just in case you didn't notice: the above is not a test of the
>>>> example I gave.
>>>>
>>>>
>>>>> $ python cleanup.py
>>>>> Cleanup executed without an exception.
>>>>> Cleanup execute with an exception.
>>>>> Traceback (most recent call last):
>>>>> File "cleanup.py", line 28, in <module>
>>>>> raise RuntimeError()
>>>>> RuntimeError
>>>>>
>>>>>>> The actions are always executed in your example,
>>>>>>
>>>>>> Sorry, that's incorrect.
>>>>>
>>>>> Looks like it to me.
>>>>
>>>> I'm sorry, but you're
>>>>
>>>> 1) not testing my example which you're claiming that you're testing, 
>>>> and
>>>
>>> Then I would appreciate your writing a complete, runnable example that
>>> demonstrates the feature you are claiming. Because it's apparently not
>>> "ensur[ing] some desired cleanup at the end of a scope, even when the
>>> scope is exited via an exception" that you talked about in your
>>> original post.
>>>
>>> Your sketch of an example looks like mine:
>>>
>>> with Cleanup as at_cleanup:
>>> # blah blah
>>> chdir( somewhere )
>>> at_cleanup.call( lambda: chdir( original_dir ) )
>>> # blah blah
>>>
>>> The cleanup function gets registered immediately after the first
>>> chdir() and before the second "blah blah". Even if an exception is
>>> raised in the second "blah blah", then the cleanup function will still
>>> run. This would be equivalent to a try: finally:
>>>
>>> # blah blah #1
>>> chdir( somewhere )
>>> try:
>>> # blah blah #2
>>> finally:
>>> chdir( original_dir )
>>
>> Yes, this is equivalent code.
>>
>> The try-finally that you earlier claimed was equivalent, was not.
> 
> Okay, but just because of the position of the chdir(), right?

Yes, since it yields different results.


>>> and not a try: else:
>>>
>>> # blah blah #1
>>> chdir( somewhere )
>>> try:
>>> # blah blah #2
>>> else:
>>> chdir( original_dir )
>>
>> This example is however meaningless except as misdirection. There are
>> infinitely many constructs that include try-finally and try-else, that
>> the with-Cleanup code is not equivalent to. It's dumb to show one such.
>>
>> Exactly what are you trying to prove here?
> 
> I'm just showing you what I thought you meant when you told Mike that he 
> should have used a try/else instead of try/finally.
> 
>> Your earlier claims are still incorrect.
>>
>>> Now, I assumed that the behavior with respect to exceptions occurring
>>> in the first "blah blah" weren't what you were talking about because
>>> until the chdir(), there is nothing to clean up.
>>>
>>> There is no way that the example you gave translates to a try: else:
>>> as you claimed in your response to Mike Kent.
>>
>> Of course there is.
>>
>> Note that Mike wrapped the action A within the 'try':
>>
>>
>> <code author="Mike" correct="False">
>> original_dir = os.getcwd()
>> try:
>> os.chdir(somewhere)
>> # Do other stuff
>> finally:
>> os.chdir(original_dir)
>> # Do other cleanup
>> </code>
>>
>>
>> The 'finally' he used, shown above, yields incorrect behavior.
>>
>> Namely cleanup always, while 'else', in that code, can yield correct
>> behavior /provided/ that it's coded correctly:
>>
>>
>> <code author="Alf" correct="ProbablyTrue" disclaimer="off the cuff">
>> original_dir = os.getcwd()
>> try:
>> os.chdir(somewhere)
>> except Whatever:
>> # whatever, e.g. logging
>> raise
>> else:
>> try:
>> # Do other stuff
>> finally:
>> os.chdir(original_dir)
>> # Do other cleanup
>> </code>
> 
> Ah, okay. Now we're getting somewhere. Now, please note that you did not 
> have any except: handling in your original example. So Mike made a try: 
> finally: example to attempt to match the semantics of your code. When 
> you tell him that he should 'mean a simple "try/else". "finally" is 
> always executed. which is incorrect for cleanup', can you understand why 
> we might think that you were saying that try: finally: was wrong and 
> that you were proposing that your code was equivalent to some try: 
> except: else: suite?

No, not really. His code didn't match the semantics. Changing 'finally' to 
'else' could make it equivalent.


>>>> 2) not even showing anything about your earlier statements, which were
>>>> just incorrect.
>>>>
>>>> You're instead showing that my code works as it should for the case 
>>>> that
>>>> you're testing, which is a bit unnecessary since I knew that, but 
>>>> thanks
>>>> anyway.
>>>
>>> It's the case you seem to be talking about in your original post.
>>
>> What's this "seems"? Are you unable to read that very short post?
> 
> I say "seems" because my understandings of what you meant in your 
> original post and your response to Mike disagreed with one another. Now 
> I see that your later posts were talking about minor discrepancy about 
> which errors you wanted caught by the finally: and which you didn't.

It's absolutely not a minor discrepancy whether some code is executed or not. It 
can have arbitrarily large effect. And from my point of view the discussion of 
that snippet has not been about what errors I "want" caught by the 'finally'; 
it's been about whether two snippets of code yield the same effect or not: 
Mike's code was incorrect not because it did something else, but because as code 
that did something else it was not an equivalent to the code that I posted.


> I 
> was confused because it seemed that you were saying that try: finally: 
> was completely wrong and that "try/else" was right. It confused me and 
> at least one other person.
> 
>>> , but I do ask you to acknowledge that you originally were talking
>>> about a feature that "ensure[s] some desired cleanup at the end of a
>>> scope, even when the scope is exited via an exception."
>>
>> Yes, that's what it does.
>>
>> Which is I why I wrote that.
>>
>> This should not be hard to grok.
>>
>>
>>> Do you acknowledge this?
>>
>> This seems like pure noise, to cover up that you were sputing a lot of
>> incorrect statements earlier.
> 
> No, I'm just trying to clarify what you are trying to say. The above 
> statement did not appear to accord with your later statement: 'if you 
> thought about it you would mean a simple "try/else". "finally" is always 
> executed. which is incorrect for cleanup.' It turns out that what you 
> really meant was that it would be incorrect for cleanup to be executed 
> when an error occurred in the chdir() itself.
> 
> Now, I happen to disagree with that.

Well, I was pretty unclear, almost hint-like, sorry about that, mea culpa, but 
you have it slightly wrong. You wrote then "The example you gave is definitely 
equivalent to the try: finally: that Mike posted." And it isn't.


> There are a couple of ways to do 
> this kind of cleanup depending on the situation. Basically, you have 
> several different code blocks:
> 
> # 1. Record original state.
> # 2. Modify state.
> # 3. Do stuff requiring the modified state.
> # 4. Revert to the original state.
> 
> Depending on where errors are expected to occur, and how the state needs 
> to get modified and restored, there are different ways of arranging 
> these blocks. The one Mike showed:
> 
> # 1. Record original state.
> try:
>     # 2. Modify state.
>     # 3. Do stuff requiring the modified state.
> finally:
>     # 4. Revert to the original state.
> 
> And the one you prefer:
> 
> # 1. Record original state.
> # 2. Modify state.
> try:
>     # 3. Do stuff requiring the modified state.
> finally:
>     # 4. Revert to the original state.
> 
> These differ in what happens when an error occurs in block #2, the 
> modification of the state. In Mike's, the cleanup code runs; in yours, 
> it doesn't. For chdir(), it really doesn't matter. Reverting to the 
> original state is harmless whether the original chdir() succeeds or 
> fails, and chdir() is essentially atomic so if it raises an exception, 
> the state did not change and nothing needs to be cleaned up.
> 
> However, not all block #2s are atomic. Some are going to fail partway 
> through and need to be cleaned up even though they raised an exception. 
> Fortunately, cleanup can frequently be written to not care whether the 
> whole thing finished or not.

Yeah, and there are some systematic ways to handle these things. You might look 
up Dave Abraham's levels of exception safety. Mostly his approach boils down to 
making operations effectively atomic so as to reduce the complexity: ideally, if 
an operation raises an exception, then it has undone any side effects.

Of course it can't undo the launching of an ICBM, for example...

But ideally, if it could, then it should.

If you call the possibly failing operation "A", then that systematic approach 
goes like this: if A fails, then it has cleaned up its own mess, but if A 
succeeds, then it's the responsibility of the calling code to clean up if the 
higher level (multiple statements) operation that A is embedded in, fails.

And that's what Marginean's original C++ ScopeGuard was designed for, and what 
the corresponding Python Cleanup class is designed for.


> Both formulations can be correct (and both work perfectly fine with the 
> chdir() example being used). Sometimes one is better than the other, and 
> sometimes not. You can achieve both ways with either your Cleanup class 
> or with try: finally:.
> 
> I am still of the opinion that Cleanup is not an improvement over try: 
> finally: and has the significant ugliness of forcing cleanup code into 
> callables. This significantly limits what you can do in your cleanup code.

Uhm, not really. :-) As I see it.

But for any given task one should use the most practical tool, and I'm certainly 
not claiming that Cleanup will always be that: it's just another weapon to 
employ in the correctness war  --  although I think it's a powerful one.


Cheers,

- Alf


From clp2 at rebertia.com  Wed Mar  3 20:06:01 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 3 Mar 2010 17:06:01 -0800
Subject: Question about typing: ints/floats
In-Reply-To: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
References: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
Message-ID: <50697b2c1003031706l6043430fv14e72203d7915a4f@mail.gmail.com>

On Wed, Mar 3, 2010 at 3:45 PM, Wells <thewellsoliver at gmail.com> wrote:
> This seems sort of odd to me:
>
>>>> a = 1
>>>> a += 1.202
>>>> a
> 2.202
>
> Indicates that 'a' was an int that was implicitly casted to a float.

Remember Python is dynamically typed. Values have types, but variables
don't (I could do a = "foo" at the end of your code and Python won't
complain).
But yes, internally, Python converted the int to a float before doing
the addition.

> But:
>
>>>> a = 1
>>>> b = 3
>>>> a / b
> 0
>
> This does not implicitly do the casting, it treats 'a' and 'b' as
> integers, and the result as well. Changing 'b' to 3.0 will yield a
> float as a result (0.33333333333333331)

This has been fixed in Python v3.x
You can request the new behavior in earlier versions using a magic import:

>>> from __future__ import division
>>> a = 1
>>> b = 3
>>> a / b
0.33333333333333331

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


From anand.shashwat at gmail.com  Wed Mar  3 20:06:54 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Thu, 4 Mar 2010 06:36:54 +0530
Subject: Question about typing: ints/floats
In-Reply-To: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
References: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
Message-ID: <d4ab53de1003031706k476ae8a4n8e359e47b1dcec7@mail.gmail.com>

yes
you can also try:
>>> float(a)/b
0.33333333333333331


On Thu, Mar 4, 2010 at 5:15 AM, Wells <thewellsoliver at gmail.com> wrote:

> This seems sort of odd to me:
>
> >>> a = 1
> >>> a += 1.202
> >>> a
> 2.202
>
> Indicates that 'a' was an int that was implicitly casted to a float.
> But:
>
> >>> a = 1
> >>> b = 3
> >>> a / b
> 0
>
> This does not implicitly do the casting, it treats 'a' and 'b' as
> integers, and the result as well. Changing 'b' to 3.0 will yield a
> float as a result (0.33333333333333331)
>
> Is there some way to explain the consistency here? Does python
> implicitly change the casting when you add variables of a different
> numeric type?
>
> Anyway, just  curiosity more than anything else. Thanks!
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From benjamin.kaplan at case.edu  Wed Mar  3 20:13:50 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 3 Mar 2010 20:13:50 -0500
Subject: Question about typing: ints/floats
In-Reply-To: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
References: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
Message-ID: <ec96e1391003031713n1b363bb9o2d2d3d2a78cc7bb4@mail.gmail.com>

On Wed, Mar 3, 2010 at 6:45 PM, Wells <thewellsoliver at gmail.com> wrote:

> This seems sort of odd to me:
>
> >>> a = 1
> >>> a += 1.202
> >>> a
> 2.202
>
> Indicates that 'a' was an int that was implicitly casted to a float.
> But:
>
> >>> a = 1
> >>> b = 3
> >>> a / b
> 0
>
> This does not implicitly do the casting, it treats 'a' and 'b' as
> integers, and the result as well. Changing 'b' to 3.0 will yield a
> float as a result (0.33333333333333331)
>
> Is there some way to explain the consistency here? Does python
> implicitly change the casting when you add variables of a different
> numeric type?
>
> Anyway, just  curiosity more than anything else. Thanks!
> --
>

Python doesn't cast anything. Variable names in python do not have types.
It's the objects bound to the names that have types.

a += 1.202 does not change a in place. It is exactly the same thing as
writing
a = a + 1.202

In Python (like many other languages), int + float returns a float. That
float is then assigned to the name "a".

In Python 2, all operations with two int operands return an int, including
division. This was changed in Python 3 so that 1 / 3 will return a float and
1 // 3 will do integer division.


> http://mail.python.org/mailman/listinfo/python-list
>
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From python at mrabarnett.plus.com  Wed Mar  3 20:28:25 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 04 Mar 2010 01:28:25 +0000
Subject: Question about typing: ints/floats
In-Reply-To: <b800048f-b09e-4c39-bf15-9bcd3dae11bc@y11g2000yqh.googlegroups.com>
References: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
	<b800048f-b09e-4c39-bf15-9bcd3dae11bc@y11g2000yqh.googlegroups.com>
Message-ID: <4B8F0CB9.3070708@mrabarnett.plus.com>

Zeeshan Quireshi wrote:
> On Mar 3, 6:45 pm, Wells <thewellsoli... at gmail.com> wrote:
>> This seems sort of odd to me:
>>
>>>>> a = 1
>>>>> a += 1.202
>>>>> a
>> 2.202
>>
>> Indicates that 'a' was an int that was implicitly casted to a float.
>> But:
>>
>>>>> a = 1
>>>>> b = 3
>>>>> a / b
>> 0
>>
>> This does not implicitly do the casting, it treats 'a' and 'b' as
>> integers, and the result as well. Changing 'b' to 3.0 will yield a
>> float as a result (0.33333333333333331)
>>
>> Is there some way to explain the consistency here? Does python
>> implicitly change the casting when you add variables of a different
>> numeric type?
>>
>> Anyway, just  curiosity more than anything else. Thanks!
> 
> Python, like most other languages performs only integer division when
> both the operands are ints. So only if one of the types is a flot or
> you explicitly cast your expression to be a double, then the value
> will be a fraction. otherwise you will the quotient.

int + int gives int
float + float gives float
int + float gives float
float + int gives float

Similarly for '-' and '*'.

Division causes a problem because what is int / int? Should it behave
like the others and give an int? That would mean that 1 / 2 == 0, which
can be confusing for newbies.

In older languages (Fortran, for example) integer divided by integer
using the normal division operator '/' was integer, and this is what C
and those influenced by it do.

Newer languages return a float instead of an integer because it causes
less confusion (1 / 2 == 0.5 is less confusing than 1 / 2 == 0), but
also provide a special integer division operator.

In Python v2.x '/' does integer division, but from Python v3.x '/' does
float division and uses '//' for integer division. ('//' is also
available in later versions of 2.x.)


From chris.lieb at gmail.com  Wed Mar  3 20:33:00 2010
From: chris.lieb at gmail.com (Chris Lieb)
Date: Wed, 3 Mar 2010 17:33:00 -0800 (PST)
Subject: Failure in test_hashlib.py and test_hmac.py
Message-ID: <175865db-f64a-4633-8e36-ab4a5a5eaccf@x22g2000yqx.googlegroups.com>

I am building Python 2.6.4 on a shared server and am encountering test
failures in test_hashlib.py and test_hmac.py, specifically concerning
sha512.  I recompiled Python with --with-pydebug and CLFAGS=CPPFLAGS="-
g" and ran the tests in GDB and got the following results:

----------------------------------------------------------------------------

GNU gdb 6.6.50.20070726-cvs
Copyright (C) 2007 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and
you are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for
details.
This GDB was configured as "x86_64-suse-linux"...
Using host libthread_db library "/lib64/libthread_db.so.1".
(gdb) run test_hashlib.py
Starting program: /export/users1/chris.lieb/packages/python/bin/
python2.6 test_hashlib.py
test_case_md5_0 (__main__.HashLibTestCase) ... ok
test_case_md5_1 (__main__.HashLibTestCase) ... ok
test_case_md5_2 (__main__.HashLibTestCase) ... ok
test_case_md5_huge (__main__.HashLibTestCase) ... ok
test_case_md5_uintmax (__main__.HashLibTestCase) ... ok
test_case_sha1_0 (__main__.HashLibTestCase) ... ok
test_case_sha1_1 (__main__.HashLibTestCase) ... ok
test_case_sha1_2 (__main__.HashLibTestCase) ... ok
test_case_sha1_3 (__main__.HashLibTestCase) ... ok
test_case_sha224_0 (__main__.HashLibTestCase) ... ok
test_case_sha224_1 (__main__.HashLibTestCase) ... ok
test_case_sha224_2 (__main__.HashLibTestCase) ... ok
test_case_sha224_3 (__main__.HashLibTestCase) ... ok
test_case_sha256_0 (__main__.HashLibTestCase) ... ok
test_case_sha256_1 (__main__.HashLibTestCase) ... ok
test_case_sha256_2 (__main__.HashLibTestCase) ... ok
test_case_sha256_3 (__main__.HashLibTestCase) ... ok
test_case_sha384_0 (__main__.HashLibTestCase) ... ok
test_case_sha384_1 (__main__.HashLibTestCase) ... ok
test_case_sha384_2 (__main__.HashLibTestCase) ... ok
test_case_sha384_3 (__main__.HashLibTestCase) ... ok
test_case_sha512_0 (__main__.HashLibTestCase) ... FAIL
test_case_sha512_1 (__main__.HashLibTestCase) ... FAIL
test_case_sha512_2 (__main__.HashLibTestCase) ... FAIL
test_case_sha512_3 (__main__.HashLibTestCase) ... FAIL
test_hexdigest (__main__.HashLibTestCase) ...
Program received signal SIGSEGV, Segmentation fault.
Cannot remove breakpoints because program is no longer writable.
It might be running in another process.
Further execution is probably impossible.
0x00002ba86ffbb463 in ?? ()
(gdb) bt
#0  0x00002ba86ffbb463 in ?? ()
#1  0x000000000046993d in PyString_FromStringAndSize (
    str=0x7fff71c67800 "???\203???5~??????T(P???m\200\a??? ???\005\vW
\025???\203???!???l??????G??????<]
\205                                                    5??????
\203\030???\207~???/c???1???GAz\201???82z???'???>???x???q???\177",
size=1054484473)
    at Objects/stringobject.c:90
#2  0x00002ba87030d59a in ?? ()
#3  0x0000000000000000 in ?? ()

-----------------------------------------------------------------------------------------

GNU gdb 6.6.50.20070726-cvs
Copyright (C) 2007 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and
you are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for
details.
This GDB was configured as "x86_64-suse-linux"...
Using host libthread_db library "/lib64/libthread_db.so.1".
(gdb) run test_hmac.py
Starting program: /export/users1/chris.lieb/packages/python/bin/
python2.6 test_hmac.py
test_legacy_block_size_warnings (__main__.TestVectorsTestCase) ... ok
test_md5_vectors (__main__.TestVectorsTestCase) ... ok
test_sha224_rfc4231 (__main__.TestVectorsTestCase) ... ok
test_sha256_rfc4231 (__main__.TestVectorsTestCase) ... ok
test_sha384_rfc4231 (__main__.TestVectorsTestCase) ... ok
test_sha512_rfc4231 (__main__.TestVectorsTestCase) ...
Program received signal SIGSEGV, Segmentation fault.
Cannot remove breakpoints because program is no longer writable.
It might be running in another process.
Further execution is probably impossible.
0x00002b483844e4c7 in ?? ()
(gdb) bt
#0  0x00002b483844e4c7 in ?? ()
#1  0x000000000046993d in PyString_FromStringAndSize (
    str=0x7ffff84f6730 "\026C3D???\235D\t???\025??????[??????G???
\032bG????????~???\235\t\233aP",
    size=4108309188) at Objects/stringobject.c:90
#2  0x00002b48387e159a in ?? ()
#3  0x0000000000000000 in ?? ()

--------------------------------------------------------------------

In the case of test_hashlib.py, it segfaulted on the first sha512 test
when I didn't have the debugging options enabled.  Only after enabling
debugging did I get FAIL's for the sha512 tests.

Does anyone know what is causing these failures?


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar  3 21:00:02 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 04 Mar 2010 02:00:02 GMT
Subject: Question about typing: ints/floats
References: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
Message-ID: <pan.2010.03.04.02.00.03@REMOVE.THIS.cybersource.com.au>

On Wed, 03 Mar 2010 15:45:51 -0800, Wells wrote:

> But:
> 
>>>> a = 1
>>>> b = 3
>>>> a / b
> 0
> 
> This does not implicitly do the casting, it treats 'a' and 'b' as
> integers, and the result as well. Changing 'b' to 3.0 will yield a float
> as a result (0.33333333333333331)

This is  design flaw in older versions of Python, that the / operator for 
ints performs integer division rather than floating point division.

In Python 2.5 and beyond, you can fix this by calling 

from __future__ import division 


at the top of your module, and then / will perform float division with 
int arguments, and you can use // for integer division.

Or upgrade to Python 3.1, where this is the default behaviour and there 
is no need for the from __future__ call.



-- 
Steven


From debatem1 at gmail.com  Wed Mar  3 21:04:32 2010
From: debatem1 at gmail.com (geremy condra)
Date: Wed, 3 Mar 2010 21:04:32 -0500
Subject: Passing FILE * types using ctypes
In-Reply-To: <a83319d7-c199-4532-9816-d002f7fd7914@q16g2000yqq.googlegroups.com>
References: <a83319d7-c199-4532-9816-d002f7fd7914@q16g2000yqq.googlegroups.com>
Message-ID: <f3cc57c61003031804t5b2ef682j154caeec0f16dafb@mail.gmail.com>

On Wed, Mar 3, 2010 at 6:50 PM, Zeeshan Quireshi
<zeeshan.quireshi at gmail.com> wrote:
> Hello, I'm using ctypes to wrap a library i wrote. I am trying to pass
> it a FILE *pointer, how do i open a file in Python and convert it to a
> FILE *pointer. Or do i have to call the C library using ctypes first,
> get the pointer and then pass it to my function.

Something along these lines should work:

class FILE(ctypes.structure):
    pass

FILE_p = ctypes.POINTER(FILE)

...but I haven't tested it.

You can also use a c_void_p.

> Also, is there any automated way to convert c struct and enum
> definitions to ctypes data types.

for structures:
http://code.activestate.com/recipes/576734-c-struct-decorator/?in=user-4170000

for functions:
http://code.activestate.com/recipes/576731-c-function-decorator/?in=user-4170000

Geremy Condra


From john at castleamber.com  Wed Mar  3 21:11:25 2010
From: john at castleamber.com (John Bokma)
Date: Wed, 03 Mar 2010 20:11:25 -0600
Subject: Working group for Python CPAN-equivalence?
References: <mailman.179.1267620332.23598.python-list@python.org>
	<87r5o1v8vp.fsf@benfinney.id.au>
	<4b8e929d$0$1585$742ec2ed@news.sonic.net>
	<hmmiks$1ru$1@dough.gmane.org>
	<6cc20cea1003031417i15b66bcdi454bba5a9c642d95@mail.gmail.com>
	<mailman.261.1267659815.23598.python-list@python.org>
Message-ID: <871vg0bzua.fsf@castleamber.com>

Philip Semanchuk <philip at semanchuk.com> writes:

> Do Fedora & Ubuntu's package managers offer modules that appear in
> CPAN?

Yes, I've installed so far all Perl modules I need that way (sudo
apt-get install ...)

> In other words, if I was a Perl user under Ubuntu would I use
> the pkg manager to add a Perl module, or CPAN, or would both work?

Both would work, but I would make very sure to use a separate
installation directory for modules installed via CPAN.

AFAIK there are also programs that pack CPAN modules/bundles into
something the package manager can use to install.

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar  3 21:14:18 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 04 Mar 2010 02:14:18 GMT
Subject: Generic singleton
References: <mailman.222.1267642515.23598.python-list@python.org>
Message-ID: <pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>

On Wed, 03 Mar 2010 19:54:52 +0100, mk wrote:

> Hello,
> 
> So I set out to write generic singleton, i.e. the one that would do a
> singleton with attributes of specified class. At first:

Groan. What is it with the Singleton design pattern? It is one of the 
least useful design patterns, and yet it's *everywhere* in Java and C++ 
world.

I suspect because it allows people to have all the bugs and difficulties 
of global variables, while still pretending to be virtuous for not using 
global variables. But maybe I'm cynical...

There are a ton of recipes out there for Python Singletons. Don't forget 
to check out the Borg pattern, which gives more or less the same effect 
using a radically different approach.

Then, my advice is to forget all about them. In my experience, I have 
never needed to code my own Singleton class in anything except toy 
examples. YMMV.


> print id(s1) == id(s2)

Or, more concisely:

s1 is s2




> class Singleton(object):
> 
>      instd = {}
> 
>      def __new__(cls, impclass, *args, **kwargs):
>          impid = id(impclass)

Yuck. Why are you using the id of the class as the key, instead of the 
class itself?


class Singleton(object):
    instd = {}
    def __new__(cls, impclass, *args, **kwargs):
        if not impclass in cls.instd:
            cls.instd[impclass] = impclass.__new__(
                impclass, *args, **kwargs)
         return cls.instd[impclass]


> Questions:
> 
> 1. Is this safe? That is, does every builtin class have unique id? I
> have found this in docs:

Why are you limiting yourself to builtin classes?

ALL objects, whether classes or builtins or strings or ints or instances 
of a class you built yourself, have a unique id that lasts for the 
lifespan of the object. But that is certainly not what you care about.


-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar  3 21:18:23 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 04 Mar 2010 02:18:23 GMT
Subject: Question about typing: ints/floats
References: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
	<mailman.263.1267664764.23598.python-list@python.org>
Message-ID: <pan.2010.03.04.02.18.22@REMOVE.THIS.cybersource.com.au>

On Wed, 03 Mar 2010 17:06:01 -0800, Chris Rebert wrote:

> But yes, internally, Python converted the int to a float before doing
> the addition.


[pedantic]
To be precise, Python created a *new* float from the int, leaving the 
original int alone. Because ints and floats are objects, if Python 
actually converted the int to a float, this would happen:


>>> n = 1
>>> m = n
>>> x = 2.0 + n
>>> print x
3.0
>>> print n
1.0
>>> "abc"[m]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: string indices must be integers

and the world would rapidly be destroyed. Fortunately this does not 
happen.
[/pedantic]




-- 
Steven


From cournape at gmail.com  Wed Mar  3 21:24:24 2010
From: cournape at gmail.com (David Cournapeau)
Date: Thu, 4 Mar 2010 11:24:24 +0900
Subject: PYTHONPATH and eggs
In-Reply-To: <86ee3b75-b3f5-4172-90c8-e90f0e50b89f@a18g2000yqc.googlegroups.com>
References: <86ee3b75-b3f5-4172-90c8-e90f0e50b89f@a18g2000yqc.googlegroups.com>
Message-ID: <5b8d13221003031824g6e26c9bbsc5a5fd52bbcd323e@mail.gmail.com>

On Wed, Mar 3, 2010 at 7:14 PM, geoffbache <geoff.bache at jeppesen.com> wrote:

> Unfortunately, the location from PYTHONPATH ends up after the eggs in
> sys.path so I can't persuade Python to import my version. The only way
> I've found to fix it is to copy the main script and manually hack
> sys.path at the start of it which isn't really very nice. I wonder if
> there is any better way as I can't be the first person to want to do
> this, surely?

One way is to never install things as eggs: I have a script
hard_install which forces things to always install with
--single-externally-managed blablabla. This has worked very well for
me, but may not always be applicable (in particular if you are on a
platform where building things from sources is difficult).

cheers,

David


From roy at panix.com  Wed Mar  3 21:28:03 2010
From: roy at panix.com (Roy Smith)
Date: Wed, 03 Mar 2010 21:28:03 -0500
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<eq4l57-okf2.ln1@ozzie.tundraware.com>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <7uu1ooFiipU1@mid.individual.net>
	<4B89D8BE.2040905@mrabarnett.plus.com> <4B8B9845.70604@sequans.com>
	<mailman.59.1267456634.23598.python-list@python.org>
	<7v695nFa0fU1@mid.individual.net>
	<4B8E7538.2080003@mrabarnett.plus.com>
	<mailman.201.1267632673.23598.python-list@python.org>
Message-ID: <roy-BD14BA.21280303032010@news.panix.com>

In article <mailman.201.1267632673.23598.python-list at python.org>,
 "D'Arcy J.M. Cain" <darcy at druid.net> wrote:

> On Wed, 03 Mar 2010 14:42:00 +0000
> MRAB <python at mrabarnett.plus.com> wrote:
> > Gregory Ewing wrote:
> > Mk14 from Science of Cambridge, a kit with hex keypad and 7-segment
> > display, which I had to solder together, and also make my own power
> > supply. I had the extra RAM and the I/O chip, so that's 256B (including
> > the memory used by the monitor) + 256B additional RAM + 128B more in the
> > I/O chip.
> 
> In case some of you youngsters think that there is a typo in the above,
> no, he means a total of 640 bytes.  In today's terms that would be
> approx 0.0000006GB.

640 bytes!  Man, did you have it easy.  When I was a kid, we had to walk 10 
miles uphill to school in the snow, oh, wait, wrong story.  When I was a 
kid, we had a D2 kit (http://tinyurl.com/yfgyq4u).  We had 256 bytes of 
RAM.  And we thought we were lucky!  Some of the other kids, if they wanted 
to store a number, they had to scratch the bits into stone tablets with 
their bare hands...

When's the last time you had a computer where the instruction manual warned 
you against wearing silk or nylon clothing?


From srikrishnamohan at gmail.com  Wed Mar  3 21:30:21 2010
From: srikrishnamohan at gmail.com (km)
Date: Thu, 4 Mar 2010 11:30:21 +0900
Subject: NoSQL Movement?
In-Reply-To: <BABjn.11012$pv.4575@news-server.bigpond.net.au>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<mailman.256.1267655008.23598.python-list@python.org>
	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
Message-ID: <f4cc03641003031830o60c5dc09pb077bebedc02d231@mail.gmail.com>

Hi,

this would be a good place to start
http://en.wikipedia.org/wiki/NoSQL
http://nosql-database.org/

HTH,
Krishna

On Thu, Mar 4, 2010 at 7:41 AM, Avid Fan <me at privacy.net> wrote:

> Jonathan Gardner wrote:
>
>
>> I see it as a sign of maturity with sufficiently scaled software that
>> they no longer use an SQL database to manage their data. At some point
>> in the project's lifetime, the data is understood well enough that the
>> general nature of the SQL database is unnecessary.
>>
>>
> I am really struggling to understand this concept.
>
> Is it the normalised table structure that is in question or the query
> language?
>
> Could you give some sort of example of where SQL would not be the way to
> go.   The only things I can think of a simple flat file databases.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From falk at mauve.rahul.net  Wed Mar  3 21:50:23 2010
From: falk at mauve.rahul.net (Edward A. Falk)
Date: Thu, 4 Mar 2010 02:50:23 +0000 (UTC)
Subject: DOS Follies (Was: Docstrings...)
References: <20100303114603.7021e9ba.darcy@druid.net>
	<539252.91463.qm@web58904.mail.re1.yahoo.com>
	<hmme68$glb$1@dough.gmane.org>
	<mailman.248.1267652136.23598.python-list@python.org>
Message-ID: <hmn75f$vi1$1@blue.rahul.net>

In article <mailman.248.1267652136.23598.python-list at python.org>,
D'Arcy J.M. Cain <darcy at druid.net> wrote:
>On Wed, 03 Mar 2010 20:44:08 +0100
>mk <mrkafk at gmail.com> wrote:
>> It reminds me of why Windows uses backslashes for path separation 
>> instead of slashes: what I've *heard*, and do not know if it's true, 
>> it's because Gates fancied using / for options switch instead of -, and 
>> to hell with established practice.
>
>That was because CP/M used slashes for options and DOS copied that.  By
>the time hierarchy was added it was too late to change.

And CP/M got it from the various PDP-11 operating systems.  I *think*
that Tops-10 had it as well.  In fact, I think using / to delimit
commandline options goes back to the PDP-8.

-- 
	-Ed Falk, falk at despams.r.us.com
	http://thespamdiaries.blogspot.com/


From philip at semanchuk.com  Wed Mar  3 21:53:19 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Wed, 3 Mar 2010 21:53:19 -0500
Subject: NoSQL Movement?
In-Reply-To: <BABjn.11012$pv.4575@news-server.bigpond.net.au>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<mailman.256.1267655008.23598.python-list@python.org>
	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
Message-ID: <161DBC13-9917-47E4-99FA-0D04AFC7DC44@semanchuk.com>


On Mar 3, 2010, at 5:41 PM, Avid Fan wrote:

> Jonathan Gardner wrote:
>
>> I see it as a sign of maturity with sufficiently scaled software that
>> they no longer use an SQL database to manage their data. At some  
>> point
>> in the project's lifetime, the data is understood well enough that  
>> the
>> general nature of the SQL database is unnecessary.
>
> I am really struggling to understand this concept.
>
> Is it the normalised table structure that is in question or the  
> query language?
>
> Could you give some sort of example of where SQL would not be the  
> way to go.   The only things I can think of a simple flat file  
> databases.

Well, Zope is backed by an object database rather than a relational one.





From jackdied at gmail.com  Wed Mar  3 22:43:01 2010
From: jackdied at gmail.com (Jack Diederich)
Date: Wed, 3 Mar 2010 22:43:01 -0500
Subject: NoSQL Movement?
In-Reply-To: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
Message-ID: <b8e622741003031943n1b71d89ct1a3ded4c3699d0c0@mail.gmail.com>

On Wed, Mar 3, 2010 at 12:36 PM, Xah Lee <xahlee at gmail.com> wrote:
[snip]

Xah Lee is a longstanding usenet troll.  Don't feed the trolls.


From jackdied at gmail.com  Wed Mar  3 22:59:55 2010
From: jackdied at gmail.com (Jack Diederich)
Date: Wed, 3 Mar 2010 22:59:55 -0500
Subject: Generic singleton
In-Reply-To: <6cc20cea1003031418w5ad6f59ah91562243a2cc4afb@mail.gmail.com>
References: <mailman.222.1267642515.23598.python-list@python.org>
	<m2iq9d197a.fsf@googlemail.com> <hmmjad$4gm$1@dough.gmane.org>
	<6cc20cea1003031418w5ad6f59ah91562243a2cc4afb@mail.gmail.com>
Message-ID: <b8e622741003031959o5dbf070dta948f1a4202d92b@mail.gmail.com>

On Wed, Mar 3, 2010 at 5:18 PM, Jonathan Gardner
<jgardner at jonathangardner.net> wrote:
> On Wed, Mar 3, 2010 at 1:11 PM, mk <mrkafk at gmail.com> wrote:
>>
>> Or I could make my life simpler and use global variable. :-)
>>
>
> Ding ding ding!
>
> 90% of Design Patterns is making Java suck less.
>
> Other languages don't necessarily suffer from Java's design flaws.

The original "Gang of Four" book was about C++ and not Java.  The fact
that you can casually assert that "Design Patterns" are about Java
says something not entirely kosher about Java ;)

-Jack


From blueskykind02 at gmail.com  Thu Mar  4 00:23:10 2010
From: blueskykind02 at gmail.com (yamamoto)
Date: Wed, 3 Mar 2010 21:23:10 -0800 (PST)
Subject: python SUDS library
Message-ID: <28ed0127-8b71-4327-954c-c9100b4768de@v20g2000prb.googlegroups.com>

Hi,
I tried to make a simple script with SUD library for caching torrent
files. it doenst work!

[versions]
suds: 0.4, python: 2.6.4

[code]
from suds.client import Client
import base64

path = 'sample.torrent'
doc = open(path, 'rb').read()
encoded_doc = base64.b64encode(doc)
url = 'http://torrage.com/api/torrage.wsdl'
client = Client(url, cache=None)
print client
hash = client.service.cacheTorrent(encoded_doc)
print hash

[result]

Suds ( https://fedorahosted.org/suds/ )  version: 0.4 (beta)  build:
R663-20100303

Service ( CacheService ) tns="urn:Torrage"
   Prefixes (0)
   Ports (1):
      (CachePort)
         Methods (1):
            cacheTorrent(xs:string torrent, )
         Types (0):

Traceback (most recent call last):
  File "C:\Documents and Settings\yamamoto\workspace\python\console
\extract.py", line 13, in <module>
    result = client.service.cacheTorrent(encoded_doc)
  File "C:\Python26\lib\site-packages\suds\client.py", line 539, in
__call__
    return client.invoke(args, kwargs)
  File "C:\Python26\lib\site-packages\suds\client.py", line 598, in
invoke
    result = self.send(msg)
  File "C:\Python26\lib\site-packages\suds\client.py", line 627, in
send
    result = self.succeeded(binding, reply.message)
  File "C:\Python26\lib\site-packages\suds\client.py", line 659, in
succeeded
    r, p = binding.get_reply(self.method, reply)
  File "C:\Python26\lib\site-packages\suds\bindings\binding.py", line
143, in get_reply
    replyroot = sax.parse(string=reply)
  File "C:\Python26\lib\site-packages\suds\sax\parser.py", line 136,
in parse
    sax.parse(source)
  File "C:\Python26\lib\xml\sax\expatreader.py", line 107, in parse
    xmlreader.IncrementalParser.parse(self, source)
  File "C:\Python26\lib\xml\sax\xmlreader.py", line 123, in parse
    self.feed(buffer)
  File "C:\Python26\lib\xml\sax\expatreader.py", line 211, in feed
    self._err_handler.fatalError(exc)
  File "C:\Python26\lib\xml\sax\handler.py", line 38, in fatalError
    raise exception
xml.sax._exceptions.SAXParseException: <unknown>:2:0: junk after
document element


this is a php code provided by torrage
<?
        $client = new SoapClient("http://torrage.com/api/
torrage.wsdl");
        $infoHash = $client-
>cacheTorrent(base64_encode(file_get_contents("my.torrent")));
?>

any suggestions?
thanks in advance



From waldemar.osuch at gmail.com  Thu Mar  4 00:25:29 2010
From: waldemar.osuch at gmail.com (Waldemar Osuch)
Date: Wed, 3 Mar 2010 21:25:29 -0800 (PST)
Subject: SOAP 1.2 Python client ?
References: <5a36bd30-6cbd-48ca-9ca3-dc34c97e03c0@o30g2000yqb.googlegroups.com>
Message-ID: <f075993f-5536-465d-8399-a9011a63800f@e36g2000yqc.googlegroups.com>

On Mar 3, 9:32?am, BlueBird <p... at freehackers.org> wrote:
> Hi,
>
> I am looking for a SOAP 1.2 python client. To my surprise, it seems
> that this does not exist. Does anybody know about this ?
>
> The following clients seem to be both unmaintained and still
> supporting only SOAP 1.1 :
>
> - SUDS
suds unmaintained? I beg to differ.

> - zsi
> - SOAPy
>
> cheers,
>
> Philippe



From geoff.bache at jeppesen.com  Thu Mar  4 03:20:57 2010
From: geoff.bache at jeppesen.com (geoffbache)
Date: Thu, 4 Mar 2010 00:20:57 -0800 (PST)
Subject: PYTHONPATH and eggs
References: <86ee3b75-b3f5-4172-90c8-e90f0e50b89f@a18g2000yqc.googlegroups.com>
	<mailman.268.1267669467.23598.python-list@python.org>
Message-ID: <f2f1cdd5-3022-40e8-b186-9712c5587670@19g2000yqu.googlegroups.com>


On Mar 4, 3:24?am, David Cournapeau <courn... at gmail.com> wrote:
> On Wed, Mar 3, 2010 at 7:14 PM, geoffbache <geoff.ba... at jeppesen.com> wrote:
> > Unfortunately, the location from PYTHONPATH ends up after the eggs in
> > sys.path so I can't persuade Python to import my version. The only way
> > I've found to fix it is to copy the main script and manually hack
> > sys.path at the start of it which isn't really very nice. I wonder if
> > there is any better way as I can't be the first person to want to do
> > this, surely?
>
> One way is to never install things as eggs: I have a script
> hard_install which forces things to always install with
> --single-externally-managed blablabla. This has worked very well for
> me, but may not always be applicable (in particular if you are on a
> platform where building things from sources is difficult).

Thanks for the tips. Is your script generic at all? I wonder if you'd
be prepared to share it?

Figuring out virtualenv would also be an option, as would figuring out
how to build my own egg, but both these solutions feel like overkill
to me just to enable a small bit of tweaking.

/Geoff


From asimurzin at gmail.com  Thu Mar  4 03:25:21 2010
From: asimurzin at gmail.com (=?UTF-8?B?0JDQvdC00YDQtdC5INCh0LjQvNGD0YDQt9C40L0=?=)
Date: Thu, 4 Mar 2010 00:25:21 -0800 (PST)
Subject: Don't work __getattr__ with __add__
Message-ID: <e5f2faf6-7aa1-40d2-90d1-a2048f15de2e@b7g2000yqd.googlegroups.com>

It is object of the class A, in conteiner's class tmpA. Not all method
from A are in the tmpA. So for exapmle:
A + B -- yes , tmpA + B no. I try to call method from A for tmpA. I
can to call simple method,  such as change(), bit __add__ -  don't
work. If to remove inheritance from object, the code work's. Help me,
please
#--------------------------------------
class A(object):
    def __init__( self, x, y ):
        self.x = x
        self.y = y
        pass
#-------
    def __add__( self, arg ):
       tmp1 = self.x + arg.x
       tmp2 = self.y + arg.y
       return tmpA( A( tmp1, tmp2 ) )

    def change( self, x, y ):
        self.x = x
        self.y = y
        pass
    pass
#------------------------------------------
class tmpA( object ):
    def __init__( self, theA ):
        self.A = theA
        pass
#-------
    def __call__( self ):
        return self.A
#-------
    def __coerce__( self, *args ):
        return None
#-------
    def __getattr__( self, *args ):
        name = args[ 0 ]
        try:
            attr = None
            exec "attr = self.__call__().%s" % name
            return attr
        except :
            raise AttributeError
#--------------------------------------
class B( object ):
    def __init__( self, x, y):
        self.x = x
        self.y = y
        pass
#-------------------------------------
a=A( 1,2 )
b=B( 3,4 )
tmp_a = a + b  #well
tmp_a.change( 0, 0 ) # very well !!!
v = tmp_a + b  #TypeError: "unsupported operand type(s) for +: 'tmpA'
and 'B'"


From clp2 at rebertia.com  Thu Mar  4 03:38:58 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 4 Mar 2010 00:38:58 -0800
Subject: Don't work __getattr__ with __add__
In-Reply-To: <e5f2faf6-7aa1-40d2-90d1-a2048f15de2e@b7g2000yqd.googlegroups.com>
References: <e5f2faf6-7aa1-40d2-90d1-a2048f15de2e@b7g2000yqd.googlegroups.com>
Message-ID: <50697b2c1003040038l2d778448i7667d9b75a691dd@mail.gmail.com>

On Thu, Mar 4, 2010 at 12:25 AM, ?????? ???????? <asimurzin at gmail.com> wrote:
> It is object of the class A, in conteiner's class tmpA. Not all method
> from A are in the tmpA. So for exapmle:
> A + B -- yes , tmpA + B no. I try to call method from A for tmpA. I
> can to call simple method, ?such as change(), bit __add__ - ?don't
> work. If to remove inheritance from object, the code work's. Help me,
> please

Some clarity has been lost in translation, but I think I get what you're saying.
__add__ and the other double-underscore special methods are not looked
up using __getattr__ or __getattribute__, hence trying to do addition
on tmpA, which does not define an __add__ method, fails.

For a full explanation, read:
http://docs.python.org/reference/datamodel.html#special-method-lookup-for-new-style-classes

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


From no.email at nospam.invalid  Thu Mar  4 03:52:03 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Thu, 04 Mar 2010 00:52:03 -0800
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org>
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
	<mailman.199.1267631220.23598.python-list@python.org>
Message-ID: <7xlje8lb9o.fsf@ruckus.brouhaha.com>

mk <mrkafk at gmail.com> writes:
> OK, but how? How would you make up e.g. for JSON's lack of comments?

Modify the JSON standard so that "JSON 2.0" allows comments.

> OTOH, if YAML produces net benefit for as few as, say, 200 people in
> real world, the effort to make it has been well worth it.

Not if 200,000 other people have to deal with it but don't receive the
benefit.

> http://myarch.com/why-xml-is-bad-for-humans
> http://www.ibm.com/developerworks/xml/library/x-sbxml.html

You might like this one too:

  http://www.schnada.de/grapt/eriknaggum-xmlrant.html
>
> I also have to maintain a few applications that internally use XML as
> data format: while they are tolerable, they still leave smth to be
> desired, as those applications are really slow for larger datasets,

I thought we were talking about configuration files, not "larger datasets".

> There are demonstrable benefits to this too: I for one am happy that
> ReST is available for me and I don't have to learn a behemoth such as
> DocBook to write documentation.

DocBook is so far off my radar I'd have never thought of it.  I just now
learned that it's not Windows-only.  There is already POD, Pydoc,
Texinfo, a billion or so flavors of wiki markup, vanilla LaTeX, and most
straightforwardly of all, plain old ascii.  ReST was another solution in
search of a problem.


From asimurzin at gmail.com  Thu Mar  4 03:54:13 2010
From: asimurzin at gmail.com (Andrey Simurzin)
Date: Thu, 4 Mar 2010 00:54:13 -0800 (PST)
Subject: Don't work __getattr__ with __add__
References: <e5f2faf6-7aa1-40d2-90d1-a2048f15de2e@b7g2000yqd.googlegroups.com>
	<mailman.275.1267691940.23598.python-list@python.org>
Message-ID: <a5a39d5a-5bff-406d-8ac1-836e0d368c17@z11g2000yqz.googlegroups.com>

On 4 ???, 11:38, Chris Rebert <c... at rebertia.com> wrote:
> On Thu, Mar 4, 2010 at 12:25 AM, ?????? ???????? <asimur... at gmail.com> wrote:
> > It is object of the class A, in conteiner's class tmpA. Not all method
> > from A are in the tmpA. So for exapmle:
> > A + B -- yes , tmpA + B no. I try to call method from A for tmpA. I
> > can to call simple method, ?such as change(), bit __add__ - ?don't
> > work. If to remove inheritance from object, the code work's. Help me,
> > please
>
> Some clarity has been lost in translation, but I think I get what you're saying.
> __add__ and the other double-underscore special methods are not looked
> up using __getattr__ or __getattribute__, hence trying to do addition
> on tmpA, which does not define an __add__ method, fails.
>
> For a full explanation, read:http://docs.python.org/reference/datamodel.html#special-method-lookup...
>
> Cheers,
> Chris
> --http://blog.rebertia.com

Thank you very much


From greg.ewing at canterbury.ac.nz  Thu Mar  4 05:01:06 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Thu, 04 Mar 2010 23:01:06 +1300
Subject: My four-yorkshireprogrammers contribution
In-Reply-To: <mailman.189.1267627321.23598.python-list@python.org>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>	<4B8B9845.70604@sequans.com>	<mailman.59.1267456634.23598.python-list@python.org>	<7v695nFa0fU1@mid.individual.net>
	<mailman.189.1267627321.23598.python-list@python.org>
Message-ID: <7v9e3rFl7mU1@mid.individual.net>

MRAB wrote:

> Mk14 from Science of Cambridge, a kit with hex keypad and 7-segment
> display, which I had to solder together, and also make my own power
> supply. I had the extra RAM and the I/O chip, so that's 256B (including
> the memory used by the monitor) + 256B additional RAM + 128B more in the
> I/O chip.

Luxury! Mine was a Miniscamp, based on a design published in
Electronics Australia in the 70s. 256 bytes RAM, 8 switches
for input, 8 LEDs for output. No ROM -- program had to be
toggled in each time.

Looked something like this:

   http://oldcomputermuseum.com/mini_scamp.html

except that mine wasn't built from a kit and didn't look
quite as professional as that one.

It got expanded in various ways, of course ("hacked" would
be a more accurate word). Memory expanded to 1.5KB, hex keyboard
and display (built into an old calculator case), cassette tape
interface based on a circuit scrounged from another magazine
article (never quite got it to work properly, wouldn't go at
more than about 4 bytes/sec, probably because I used resistors
and capacitors salvaged from old TV sets). Still no ROM, though.
Had to toggle in a bootstrap to load the keyboard/display
monitor (256 bytes) from tape.

Somewhere along the way I replaced the CPU with a 6800 -
much nicer instruction set! (Note for newtimers -- that's
*two* zeroes, not three.)

During that period, my holy grail was alphanumeric I/O. I was
envious of people who wrote articles about hooking surplus
teleprinters, paper tape equipment and other such cool
hardware to their homebrew micros -- sadly, no such thing was
available in NZ.

Then one day a breakthrough came -- a relative who worked
in the telephone business (government-owned in NZ at the time)
managed to get me an old teleprinter. It was Baudot, not ASCII,
which meant uppercase only, not much punctuation, and an
annoyingly stateful protocol involving letters/figures shift
characters, but it was heaps better than nothing. A bit of
hackery, of both hardware and software varieties, and I got
it working. It was as noisy as hell, but I could input and
output ACTUAL LETTERS! It was AMAZING!

As a proof of concept, I wrote an extremely small BASIC
interpreter that used one-character keywords. The amount of
room left over for a program was even smaller, making it
completely useless. But it worked, and I had fun writing it.

One thing I never really got a grip on with that computer
was a decent means of program storage. Towards the end of it's
life, I was experimenting with trying to turn an old 8-track
cartridge player into a random access block storage device,
using a tape loop. I actually got it to work, more or less,
and wrote a small "TOS" (Tape Operating System) for it that
could store and retrieve files. But it was never reliable
enough to be practical.

By that stage, umpteen layers of hackery using extremely
dubious construction techniques had turned the machine into
something of a Frankenstein monster. Calling it a bird's nest
would have been an insult to most birds. I wish I'd taken
some photos, they would have been good for scaring potential
future grandchildren.

My next computer was a Dick Smith Super 80 (*not* System 80,
which would have been a much better machine), Z80-based, built
from a kit. I had a lot of fun hacking around with that, too...
but that's another story!

-- 
Greg


From greg.ewing at canterbury.ac.nz  Thu Mar  4 05:05:10 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Thu, 04 Mar 2010 23:05:10 +1300
Subject: Docstrings considered too complicated
In-Reply-To: <mailman.208.1267634665.23598.python-list@python.org>
References: <20100224212303.242222c6@geekmail.INVALID>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>
	<kyoevn.k63@spenarnc.xs4all.nl>	<hmk60h$nce$1@reader1.panix.com>
	<7v69rcFcmeU1@mid.individual.net>	<hmltsi$jcd$1@reader1.panix.com>
	<mailman.208.1267634665.23598.python-list@python.org>
Message-ID: <7v9ebdFmfiU1@mid.individual.net>

D'Arcy J.M. Cain wrote:

> And that is why text files in MS-DOS and CP/M before it end with ^Z.
> They needed a way to tell where the end of the information was.  Why
> they used ^Z (SUB - Substitute) instead of ^C (ETX - End of TeXt) or
> even ^D (EOT - End Of Transmission) is anyone's guess.

Well, ^C is what people used for interrupting their BASIC
programs. And ^D would have made it almost compatible with
unix, which would have been far too sensible!

My guess is that it was chosen for its mnemonic value --
end of alphabet, end of file.

Also remember there were programs like Wordstar that used
control key combinations for all manner of things. It might
have been the only key left on the keyboard that wasn't
used for anything else.

-- 
Greg


From greg.ewing at canterbury.ac.nz  Thu Mar  4 05:09:01 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Thu, 04 Mar 2010 23:09:01 +1300
Subject: Docstrings considered too complicated
In-Reply-To: <hmm9pi$num$1@south.jnrs.ja.net>
References: <mailman.215.1267639293.23598.python-list@python.org>
	<hmm9pi$num$1@south.jnrs.ja.net>
Message-ID: <7v9eimFnnoU1@mid.individual.net>

Richard Brodie wrote:

> It goes back to ancient PDP operating systems, so may well
> predate Unix, depending which exact OS was the first to use it.

Yes, I think it was used in RT-11, which also had
block-oriented disk files.

There were two kinds of devices in RT-11, character
and block, and the APIs for dealing with them were
quite different. They hadn't fully got their heads
around the concept of "device independent I/O" in
those days, although they were trying.

-- 
Greg


From spamfresser at ch3ka.de  Thu Mar  4 05:09:06 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Thu, 04 Mar 2010 11:09:06 +0100
Subject: case do problem
In-Reply-To: <4b8e9e8b$0$1121$4fafbaef@reader3.news.tin.it>
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>	<hml77p$k1v$00$1@news.t-online.com>
	<4b8e9e8b$0$1121$4fafbaef@reader3.news.tin.it>
Message-ID: <hmo0s8$9fn$1@news.urz.uni-heidelberg.de>

Am 03.03.2010 18:38, schrieb Tracubik:
> Il Wed, 03 Mar 2010 09:39:54 +0100, Peter Otten ha scritto:

>> def loop():
>>      count = 0
>>      m = 0
>>      lookup = {1: 1, 2: 10, 3: 100}
>>      for iterations in range(20): # off by one
>>          # ...
>>          print "%2d %1d %3d" % (iterations, count, m) # ...
>>          if generic_condition():
>>              count += 1
>>          # ...
>>          m = lookup.get(count, m)
>>          if count == 4:
>>              break
>>
>> if __name__ == "__main__":
>>      loop()
>>      print "That's all, folks"
>>
>> Something must be wrong with me today because I find the Pascal code
>> /more/ readable..
>
> i was think the same, Pascal seem to generate a great more readable code.
> I'm a newbie, so my opinion is probably wrong, but i still think that
> don't have CASE OF and REPEAT UNTIL code block return in difficult-to-
> read code.

That is probably a side-effect of literal code translation.

No one would write something like you did when he writes in python the 
first place.


 >> Tracubik wrote:
 >>
 >>> hi, i've to convert from Pascal this code:
 >>
 >> program loop;
 >>
 >> function generic_condition: boolean;
 >> begin
 >>     generic_condition := random>  0.7
 >> end;
 >>
 >> procedure loop;
 >> var
 >>     iterations, count, m: integer;
 >> begin
 >>     iterations := 0;
 >>     count := 0;
 >>     m := 0;
 >>     repeat
 >>        iterations := iterations+1;
 >>        (*...*)
 >>        writeln(iterations:2, count:2, m:4);
 >>        (*...*)
 >>        if generic_condition then
 >> 	    inc(count);
 >>        (*...*)
 >>        case count of
 >> 	1: m := 1;
 >> 	2: m := 10;
 >> 	3: m := 100
 >>        end
 >>     until (count = 4) or (iterations = 20)
 >> end;
 >>
 >> begin
 >>     loop;
 >>     writeln("That's all, folks")
 >> end.

Hmmm lets see...
We have somewhat obscure and complicated logic.

If we cannot get rid of it, lets hide it:

class Loop:
     def __init__(self, maxiterations=0, maxcount=1, m=0):
         assert generic_condition.__call__
         self.maxiterations = maxiterations
         self.maxcount = maxcount
         self.m=m
         self.count=0
         self.iterations=0

     def __iter__(self):
         while True:
             yield self.next()

     def next(self):
         self.iterations+=1
         if self.iterations > self.maxiterations:
             raise StopIteration
         if generic_condition():
             self.count += 1
             if self.count >= self.maxcount:
                 raise StopIteration
             self.m = (None,1,10,100)[self.count]
         return self, self.m

##### So we have:

#from complicatedlogic import Loop
from random import random

def generic_condition():
     return random() > 0.7

if __name__ == '__main__':
     for loop, m in Loop(maxiterations=20, maxcount=4):
         print("%2d %1d %3d" % (loop.iterations, loop.count, m))
     print("That's all, folks")


better? worse? I honestly do not know.

Note that while this is valid py3 and runs as intended, there might be 
some off-by-one or something left.

Also, this is of course not production level code ;)

Regards,
Michael


From greg.ewing at canterbury.ac.nz  Thu Mar  4 05:15:23 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Thu, 04 Mar 2010 23:15:23 +1300
Subject: Docstrings considered too complicated
In-Reply-To: <mailman.228.1267645124.23598.python-list@python.org>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>	<4B8B9845.70604@sequans.com>	<mailman.59.1267456634.23598.python-list@python.org>	<7v695nFa0fU1@mid.individual.net>	<4B8E7538.2080003@mrabarnett.plus.com>	<20100303111248.7f40d659.darcy@druid.net>	<hmm7l9$m4f$1@dough.gmane.org>
	<mailman.228.1267645124.23598.python-list@python.org>
Message-ID: <7v9eukFpu2U1@mid.individual.net>

Steve Holden wrote:

> Puts me in mind of Mario Wolczko's early attempts to implement SmallTalk
> on a VAX 11/750. The only bitmapped display we had available was a Three
> Rivers PERQ, connected by a 9600bps serial line. We left it running at
> seven o'clock one evening, and by nine am the next day it had brought up
> about two thirds of the initial VM loader screen ...

A couple of my contemporary postgraduate students worked on
getting Smalltalk to run on an Apple Lisa. Their first attempt
at a VM implementation was written in Pascal, and it wasn't
very efficient. I remember walking into their room one day
and seeing one of them sitting there watching it boot, drawing
stuff on the screen  v...e...r...y...   s...l...o...w...l...y...

At least their display was wired directly to the machine
running the code. I hate to think what bitmapped graphics at
9600 baud would be like!

-- 
Greg


From nanyaks at googlemail.com  Thu Mar  4 05:30:15 2010
From: nanyaks at googlemail.com (simn_stv)
Date: Thu, 4 Mar 2010 02:30:15 -0800 (PST)
Subject: taking python enterprise level?...
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com> 
	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com> 
	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com> 
	<20100302015813.5397655e.darcy@druid.net>
	<hmm2jc$28u$1@dough.gmane.org> 
	<973824D8-3020-44A8-B2DA-501FF530457B@semanchuk.com>
	<hmmih7$1bs$1@dough.gmane.org> 
	<mailman.257.1267656040.23598.python-list@python.org>
Message-ID: <81d62813-c768-4f9e-aa50-d6d007a9b1e6@19g2000yqu.googlegroups.com>

till i think i absolutely need to trade-off easier and less
complicated code, better db structure (from a relational perspective)
and generally less "head aches" for speed, i think i'll stick with the
joins for now!...;)

the thought of denormalization really doesnt appeal to me...


From karen.wang at avant-port.com.cn  Thu Mar  4 05:38:08 2010
From: karen.wang at avant-port.com.cn (Karen Wang)
Date: Thu, 4 Mar 2010 18:38:08 +0800
Subject: How to  login https sever with inputing account name and password?
Message-ID: <20100304103731.740AC40E@smtpcom.263xmail.com>

Hi all,

I want to use python to access to https server, like
"https://212.218.229.10/chinatest/"

If open it from IE, will see the pop-up login windows like this 



I tried several ways but always only get page for" HTTP Error 401.2 -
Unauthorized" error. ( myusername and mypassword are all correct)

Below is my code:

import urllib2

values = {

    'user' : "myusername", 

"pass' : "mypassword" }

data = urllib2.urlencode(values)

t = urllib2.urlopen('https://212.218.229.10/chinatest/',data)

print t.read()

where I am wrong ?

Thank you very much.

 

 

Best Regards

Karen Wang

 

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From greg.ewing at canterbury.ac.nz  Thu Mar  4 05:38:22 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Thu, 04 Mar 2010 23:38:22 +1300
Subject: Old farts playing with their toys
In-Reply-To: <mailman.247.1267651670.23598.python-list@python.org>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>
	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>
	<4B8B9845.70604@sequans.com>	<mailman.59.1267456634.23598.python-list@python.org>	<7v695nFa0fU1@mid.individual.net>	<4B8E7538.2080003@mrabarnett.plus.com>	<20100303111248.7f40d659.darcy@druid.net>	<4B8EABCB.6050303@mrabarnett.plus.com>
	<mailman.247.1267651670.23598.python-list@python.org>
Message-ID: <7v9g9hF1hrU1@mid.individual.net>

D'Arcy J.M. Cain wrote:

> Did you ever play Star Trek with sound effects?

Not on that machine, but I played a version on an Apple II
that had normal speaker-generated sounds. I can still
remember the sound that a photon torpedo (a # character IIRC)
made as it lurched its way drunkenly across the sector and
hit its target. Bwoop... bwoop... bwoop... bwoop... bwoop...
bwoowoowoowoowoop! (Yes, a photon torpedo makes exactly
five bwoops when it explodes. Apparently.)

I carried a listing of it around with me for many years
afterwards, and attempted to port it to various machines,
with varying degrees of success. The most successful port
was for a BBC Master that I picked up in a junk shop one
day.

But I couldn't get the sounds right, because the BBC's
sound hardware was too intelligent. The Apple made sounds
by directly twiddling the output bit connected to the
loudspeaker, but you can't do that with a BBC -- you
have to go through its fancy 3-voice waveform generating
chip. And I couldn't get it to ramp up the pitch rapidly
enough to make a proper photon-torpedo "bwoop" sound. :-(

I also discovered that the lovely low-pitched beep that
the original game used to make at the command prompt had
a lot to do with the resonant properties of the Apple
II's big plastic case. Playing a square wave through
something too high-fidelity doesn't sound the same at
all.

> I was never able to
> get it to work but supposedly if you put an AM radio tuned to a
> specific frequency near the side with the I/O card it would generate
> static that was supposed to be the sound of explosions.
> 
> Of course, the explosions were happening in a vaccum so maybe the
> silence was accurate.  :-)

Something like that might possibly happen for real. I could
imagine an explosion in space radiating electromagnetic
noise that would sound explosion-like if you picked it
up on a radio.

This might explain why the Enterprise crew could hear things
exploding when they shot them. They were listening in at RF!

-- 
Greg


From greg.ewing at canterbury.ac.nz  Thu Mar  4 05:38:31 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Thu, 04 Mar 2010 23:38:31 +1300
Subject: Docstrings considered too complicated
In-Reply-To: <pan.2010.03.03.05.48.49@REMOVE.THIS.cybersource.com.au>
References: <20100224212303.242222c6@geekmail.INVALID>	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>	<20100227191040.6c77f2d8@geekmail.INVALID>	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>	<20100301182255.3de59bc6@geekmail.INVALID>	<mailman.66.1267465347.23598.python-list@python.org>	<20100301212954.7aa0b99d@geekmail.INVALID>
	<87eik3zmi8.fsf@benfinney.id.au>	<20100302184056.743a71e7@geekmail.INVALID>	<mailman.129.1267553139.23598.python-list@python.org>	<20100302225156.67171851@geekmail.INVALID>
	<877hpuxpdf.fsf@benfinney.id.au>	<7v6ae4Ff37U1@mid.individual.net>
	<pan.2010.03.03.05.48.49@REMOVE.THIS.cybersource.com.au>
Message-ID: <7v9g9qF1nkU1@mid.individual.net>

Steven D'Aprano wrote:

> True, but one can look at "best practice", or even "standard practice". 
> For Python coders, using docstrings is standard practice if not best 
> practice. Using strings as comments is not.

In that particular case, yes, it would be possible to
objectively examine the code and determine whether docstrings
were being used as opposed to above-the-function comments.

However, that's only a very small part of what goes to make
good code. Much more important are questions like: Are the
comments meaningful and helpful? Is the code reasonably
self-explanatory outside of the comments? Is it well
modularised, and common functionality factored out where
appropriate? Are couplings between different parts
minimised? Does it make good use of library code instead
of re-inventing things? Is it free of obvious security
flaws?

You can't *measure* these things. You can't objectively
boil them down to a number and say things like "This code
is 78.3% good; the customer requires it to be at least
75% good, so it meets the requirements in that area."

That's the way in which I believe that software engineering
is fundamentally different from hardware engineering.

-- 
Greg


From greg.ewing at canterbury.ac.nz  Thu Mar  4 05:43:20 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Thu, 04 Mar 2010 23:43:20 +1300
Subject: Adding to a module's __dict__?
In-Reply-To: <roy-3CB7A4.08210202032010@news.panix.com>
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>
	<mailman.96.1267508316.23598.python-list@python.org>
	<roy-3CB7A4.08210202032010@news.panix.com>
Message-ID: <7v9girF3b8U1@mid.individual.net>

Roy Smith wrote:
> The idea is I want to put in the beginning of the module:
> 
> declare('XYZ_FOO', 0, "The foo property")
> declare('XYZ_BAR', 1, "The bar property")
> declare('XYZ_BAZ', 2, "reserved for future use")

Okay, that seems like a passable excuse.

One thing to watch out for is that if your 'declare' function
is defined in a different module, when it calls globals() it
will get the globals of the module it's defined in, not the
one it's being called from.

There's a hackish way of getting around that, but it might
be better to put all of these symbols in a module of their
own and import them from it. The declare() function can then
be defined in that same module so that it accesses the right
globals.

-- 
Greg


From jeanmichel at sequans.com  Thu Mar  4 05:45:19 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Thu, 04 Mar 2010 11:45:19 +0100
Subject: Pylint Argument number differs from overridden method
In-Reply-To: <9ca2e014-f238-4b55-8ace-f884b2112a19@z11g2000yqz.googlegroups.com>
References: <2484ca6e-0eb9-4e0c-a7db-d035badab711@t20g2000yqe.googlegroups.com>	<mailman.226.1267644846.23598.python-list@python.org>
	<9ca2e014-f238-4b55-8ace-f884b2112a19@z11g2000yqz.googlegroups.com>
Message-ID: <4B8F8F3F.8010501@sequans.com>

Wanderer wrote:
> On Mar 3, 2:33 pm, Robert Kern <robert.k... at gmail.com> wrote:
>   
>> On 2010-03-03 11:39 AM, Wanderer wrote:
>>
>>     
>>> Pylint W0221 gives the warning
>>> Argument number differs from overridden method.
>>>       
>>> Why is this a problem? I'm overriding the method to add additional
>>> functionality.
>>>       
>> There are exceptions to every guideline. Doing this could easily be a mistake,
>> so it's one of the many things that Pylint checks for. Silence the warning if
>> you like.
>>
>> --
>> Robert Kern
>>
>> "I have come to believe that the whole world is an enigma, a harmless enigma
>>   that is made terrible by our own mad attempt to interpret it as though it had
>>   an underlying truth."
>>    -- Umberto Eco
>>     
>
> Thanks I was just wondering if I was overlooking something about
> inheritance.
>   
This is only my opinion but you get this warning because of 2 disctinct 
issues:
1/ you just made a basic mistake in your signature and need to correct it
2/ you did not make any mistake in the signature, but this warning may 
reveal a (small) flaw in your class design.


I don't know the exact context for your code, but it's better to have a 
consistant interface over your methods and mask the implementation 
details from the user.
In your case, the getRays method may always ask for the lambda 
parameters and just ignore it for one of its implementation.

And don't write empty doctrings to trick pylint. Either write them, or 
remove this rule, you are loosing all the tool benefits.


JM




From jpiitula at ling.helsinki.fi  Thu Mar  4 05:46:06 2010
From: jpiitula at ling.helsinki.fi (Jussi Piitulainen)
Date: 04 Mar 2010 12:46:06 +0200
Subject: Partly erratic wrong behaviour, Python 3, lxml
Message-ID: <qotr5o0xt3l.fsf@ruuvi.it.helsinki.fi>

Dear group,

I am observing weird semi-erratic behaviour that involves Python 3 and
lxml, is extremely sensitive to changes in the input data, and only
occurs when I name a partial result. I would like some help with this,
please. (Python 3.1.1; GNU/Linux; how do I find lxml version?)

The test script regress/Tribug is at the end of this message, with a
snippet to show the form of regress/tridata.py where the XML is.

What I observe is this. Parsing an XML document (wrapped in BytesIO)
with lxml.etree.parse and then extracting certain elements with xpath
sometimes fails so that I get three times the correct number of
elements. On the first run of the script, it fails in one way, and on
each subsequent run in another way: subsequent runs are repeatable.

Second, the bug only occurs when I give a name to the result from
lxml.etree.parse! This is seen below in the lines labeled "name1" or
"name2" that sometimes exhibit the bug, and lines labeled "nest1" or
"nest2" that never do. That is, this fails in some complex way:

        result = etree.parse(BytesIO(body))
        n = len(result.xpath(title))

This fails to fail:

        n = len(etree.parse(BytesIO(body)).xpath(title))

I have failed to observe the error interactively. I believe the
erroneus result lists are of the form [x x x y y y z z z] when they
should be [x y z] but I do not know if the x's are identical or
copies. I will know more later, of course, when I have written more
complex tests, unless somebody can lead me to a more profitable way of
debugging this.

Two versions of the test runs follow, before and after a trivial
change to the test data. Since the numbers are repeated n's of the
above snippets, they should all be the same: 5 observed 1000 times.

A first run after removing regress/tridata.pyc:

[1202] $ regress/Tribug 
name1: size 5 observed 969 times
name1: size 15 observed 31 times
name2: size 5 observed 1000 times
nest1: size 5 observed 1000 times
nest2: size 5 observed 1000 times

All subsequent runs, with regress/tridata.pyc recreated:

[1203] $ regress/Tribug 
name1: size 5 observed 1000 times
name2: size 5 observed 978 times
name2: size 15 observed 22 times
nest1: size 5 observed 1000 times
nest2: size 5 observed 1000 times

Adding an empty comment <!-- --> to the XML document;
a first run:

[1207] $ regress/Tribug 
name1: size 5 observed 992 times
name1: size 15 observed 8 times
name2: size 5 observed 1000 times
nest1: size 5 observed 1000 times
nest2: size 5 observed 1000 times

And subsequent runs:

[1208] $ regress/Tribug 
name1: size 5 observed 991 times
name1: size 15 observed 9 times
name2: size 5 observed 998 times
name2: size 15 observed 2 times
nest1: size 5 observed 1000 times
nest2: size 5 observed 1000 times

---start of regress/Tribug---
#! /bin/env python3
# -*- mode: Python; -*-

from io import BytesIO
from lxml import etree
from tridata import body, title

def naming():
    sizes = dict()
    for k in range(0,1000):
        result = etree.parse(BytesIO(body))
        n = len(result.xpath(title))
        sizes[n] = 1 + sizes.get(n, 0)
    return sizes

def nesting():
    sizes = dict()
    for k in range(0,1000):
        n = len(etree.parse(BytesIO(body)).xpath(title))
        sizes[n] = 1 + sizes.get(n, 0)
    return sizes

def report(label, sizes):
    for size, count in sizes.items():
        print('{}: size {} observed {} times'
              .format(label, size, count))

report('name1', naming())
report('name2', naming())
report('nest1', nesting())
report('nest2', nesting())
---end of regress/Tribug---

The file regress/tridata.py contains only the two constants. I omit
most of the XML. It would be several screenfuls.

---start of regress/tridata.py---
body = b'''<OAI-PMH xmlns="http://www.opena...
...
</OAI-PMH>
'''

title = '//*[name()="record"]//*[name()="dc:title"]'
---end of regress/tridata.py---


From greg.ewing at canterbury.ac.nz  Thu Mar  4 05:49:57 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Thu, 04 Mar 2010 23:49:57 +1300
Subject: Queue peek?
In-Reply-To: <137d7aa5-a305-4091-a244-904b680d3b56@t41g2000yqt.googlegroups.com>
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>
	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>
	<137d7aa5-a305-4091-a244-904b680d3b56@t41g2000yqt.googlegroups.com>
Message-ID: <7v9gv5F3b8U2@mid.individual.net>

Floris Bruynooghe wrote:
> I was just wondering if
> other people ever missed the "q.put_at_front_of_queue()" method or if
> it is just me.

Sounds like you don't want a queue, but a stack. Or
maybe a double-ended queue.

-- 
Greg


From jeanmichel at sequans.com  Thu Mar  4 05:50:06 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Thu, 04 Mar 2010 11:50:06 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <hmm5ln$arg$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>
	<hmm5ln$arg$1@news.eternal-september.org>
Message-ID: <4B8F905E.1090704@sequans.com>

Alf P. Steinbach wrote:
>>  From your post, the scope guard technique is used "to ensure some 
>> desired cleanup at the end of a scope, even when the scope is exited 
>> via an exception." This is precisely what the try: finally: syntax is 
>> for. 
>
> You'd have to nest it. That's ugly. And more importantly, now two 
> people in this thread (namely you and Mike) have demonstrated that 
> they do not grok the try functionality and manage to write incorrect 
> code, even arguing that it's correct when informed that it's not, so 
> it's a pretty fragile construct, like goto.

You want to execute some cleanup when things go wrong, use try except. 
You want to do it when things go right, use try else. You want to 
cleanup no matter what happen, use try finally.

There is no need of any Cleanup class, except for some technical 
alternative  concern.

JM




From greg.ewing at canterbury.ac.nz  Thu Mar  4 05:58:35 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Thu, 04 Mar 2010 23:58:35 +1300
Subject: case do problem
In-Reply-To: <hml77p$k1v$00$1@news.t-online.com>
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
	<hml77p$k1v$00$1@news.t-online.com>
Message-ID: <7v9hfeF8hsU1@mid.individual.net>

Peter Otten wrote:

> Something must be wrong with me today because I find the Pascal code /more/ 
> readable...

Actually I don't find either of them very readable. The
control flow is pretty convoluted either way. It might
be better if it used real-life variable and function
names to give some context, though.

-- 
Greg


From bruno.42.desthuilliers at websiteburo.invalid  Thu Mar  4 05:59:00 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 04 Mar 2010 11:59:00 +0100
Subject: Method / Functions - What are the differences?
In-Reply-To: <hmmrh4$644$1@newsreader3.netcologne.de>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
	<mailman.109.1267539415.23598.python-list@python.org>
	<hmk1mn$70u$1@newsreader3.netcologne.de>
	<4b8e4041$0$17447$426a34cc@news.free.fr>
	<hmlte9$d0f$1@dough.gmane.org>
	<mailman.205.1267633968.23598.python-list@python.org>
	<4b8e9660$0$21812$426a34cc@news.free.fr>
	<hmmrh4$644$1@newsreader3.netcologne.de>
Message-ID: <4b8f9267$0$17832$426a74cc@news.free.fr>

Eike Welk a ?crit :
> Bruno Desthuilliers wrote:
>> John Posner a ?crit :
>>> Done -- see http://wiki.python.org/moin/FromFunctionToMethod
>> Done and well done !-)
>> Thanks again for the good job John.
> 
> I like it too, thanks to both of you!
> 
> I have two small ideas for improvement: 
> - Swap the first two paragraphs. First say what it is, and then give the 
> motivation.

Mmm... As far as I'm concerned, I like it the way its. John ?

> - The section about the descriptor protocol is a bit difficult to 
> understand.

I may eventually try to rework it a bit when I'll have time (death march 
here currently, duh...)

> But judging from the official descriptor documentation, it seems 
> to be hard to explain

Not that easy, indeed. I once posted on c.l.py a longer explanation of 
the whole lookup rule stuff, that IIRC included a "naive python 
implementation" example. Might be worth trying to google for it and 
turning it into another "overview" article.

>: The official documentation is nearly incomprehensible 
> (IMHO).

I should probably have a look at it !-)


From greg.ewing at canterbury.ac.nz  Thu Mar  4 06:21:01 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Fri, 05 Mar 2010 00:21:01 +1300
Subject: Working group for Python CPAN-equivalence?
In-Reply-To: <slrnhotp4e.26k.peter@box8.pjb.com.au>
References: <mailman.179.1267620332.23598.python-list@python.org>
	<87r5o1v8vp.fsf@benfinney.id.au>
	<4b8e929d$0$1585$742ec2ed@news.sonic.net>
	<slrnhotp4e.26k.peter@box8.pjb.com.au>
Message-ID: <7v9ipdFfcsU1@mid.individual.net>

Peter Billam wrote:

> A very important thing about CPAN modules is the consistent
> basic install method:   perl Makefile.PL ; make ; make install

Well, we more or less have that with Python, too:

   python setup.py install

It may not always work smoothly, but it's the
one obvious thing to try when you've downloaded
a Python package in source form.

-- 
Greg


From olof.bjarnason at gmail.com  Thu Mar  4 06:45:39 2010
From: olof.bjarnason at gmail.com (Olof Bjarnason)
Date: Thu, 4 Mar 2010 12:45:39 +0100
Subject: Working group for Python CPAN-equivalence?
In-Reply-To: <7v9ipdFfcsU1@mid.individual.net>
References: <mailman.179.1267620332.23598.python-list@python.org>
	<87r5o1v8vp.fsf@benfinney.id.au>
	<4b8e929d$0$1585$742ec2ed@news.sonic.net>
	<slrnhotp4e.26k.peter@box8.pjb.com.au>
	<7v9ipdFfcsU1@mid.individual.net>
Message-ID: <c3dfe1d1003040345o33c7581fnfd8ee0b642c0f3ad@mail.gmail.com>

2010/3/4 Gregory Ewing <greg.ewing at canterbury.ac.nz>:
> Peter Billam wrote:
>
>> A very important thing about CPAN modules is the consistent
>> basic install method: ? perl Makefile.PL ; make ; make install
>
> Well, we more or less have that with Python, too:
>
> ?python setup.py install
>
> It may not always work smoothly, but it's the
> one obvious thing to try when you've downloaded
> a Python package in source form.
>
> --
> Greg
> --
> http://mail.python.org/mailman/listinfo/python-list
>

I want to say thanks to all that have given information regarding the
original question - for example the blog mention was valuable, aswell
as the disctintion between CPAN and cpan.

It was definately *not* my intention to start another "Where is CPAN
for Python?"-thread, but it seems we're already there. :)


-- 
http://olofb.wordpress.com


From mrkafk at gmail.com  Thu Mar  4 06:50:45 2010
From: mrkafk at gmail.com (mk)
Date: Thu, 04 Mar 2010 12:50:45 +0100
Subject: Generic singleton
In-Reply-To: <pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>
References: <mailman.222.1267642515.23598.python-list@python.org>
	<pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>
Message-ID: <hmo6qk$nop$1@dough.gmane.org>

Steven D'Aprano wrote:
> Groan. What is it with the Singleton design pattern? It is one of the 
> least useful design patterns, and yet it's *everywhere* in Java and C++ 
> world.

It's useful when larking about in language internals for learning 
purposes, for instance. I don't recall ever actually having significant 
need for it.


>>      def __new__(cls, impclass, *args, **kwargs):
>>          impid = id(impclass)
> 
> Yuck. Why are you using the id of the class as the key, instead of the 
> class itself?

Bc I didn't know whether it was safe to do that: like Arnaud pointed 
out, the *type* of bultins is hashable.

Regards,
mk





From mrkafk at gmail.com  Thu Mar  4 06:56:17 2010
From: mrkafk at gmail.com (mk)
Date: Thu, 04 Mar 2010 12:56:17 +0100
Subject: memory usage, temporary and otherwise
In-Reply-To: <4b8ee61a$0$26644$426a74cc@news.free.fr>
References: <mailman.220.1267642060.23598.python-list@python.org>
	<4b8ee61a$0$26644$426a74cc@news.free.fr>
Message-ID: <hmo751$plh$1@dough.gmane.org>

Bruno Desthuilliers wrote:
> mk a ?crit :
>> Obviously, don't try this on low-memory machine:
>>
>>>>> a={}
>>>>> for i in range(10000000):

> Note that in Python 2, this will build a list of 10000000 int objects.
> You may want to use xrange instead...

Huh? I was under impression that some time after 2.0 range was made to 
work "under the covers" like xrange when used in a loop? Or is it 3.0 
that does that?

> And this build yet another list of 10000000 int objects.

Well this explains much of the overhead.

> (overly simplified)
> 
> When an object is garbage-collected, the memory is not necessarily
> "returned" to the system - and the system doesn't necessarily claim it
> back neither until it _really_ needs it.
> 
> This avoid a _lot_ of possibly useless work for both the python
> interpreter (keeping already allocated memory costs less than immediatly
> returning it, just to try and allocate some more memory a couple
> instructions later) and the system (ditto - FWIW, how linux handles
> memory allocations is somewhat funny, if you ever programmed in C).

Ah! That explains a lot. Thanks to you, I have again expanded my 
knowledge of Python!

Hmm I would definitely like to read smth on how CPython handles memory 
on Python wiki. Thanks for that doc on wiki on "functions & methods" to 
you and John Posner, I'm reading it every day like a bible. ;-)


Regards,
mk



From ben+python at benfinney.id.au  Thu Mar  4 06:57:30 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 04 Mar 2010 22:57:30 +1100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
	<87eik3zmi8.fsf@benfinney.id.au>
	<20100302184056.743a71e7@geekmail.INVALID>
	<mailman.129.1267553139.23598.python-list@python.org>
	<20100302225156.67171851@geekmail.INVALID>
	<877hpuxpdf.fsf@benfinney.id.au> <7v6ae4Ff37U1@mid.individual.net>
	<pan.2010.03.03.05.48.49@REMOVE.THIS.cybersource.com.au>
	<7v9g9qF1nkU1@mid.individual.net>
Message-ID: <87ocj4ti39.fsf@benfinney.id.au>

Gregory Ewing <greg.ewing at canterbury.ac.nz> writes:

> However, that's only a very small part of what goes to make good code.
> Much more important are questions like: Are the comments meaningful
> and helpful? Is the code reasonably self-explanatory outside of the
> comments? Is it well modularised, and common functionality factored
> out where appropriate? Are couplings between different parts
> minimised? Does it make good use of library code instead of
> re-inventing things? Is it free of obvious security flaws?
>
> You can't *measure* these things. You can't objectively boil them down
> to a number and say things like "This code is 78.3% good; the customer
> requires it to be at least 75% good, so it meets the requirements in
> that area."

That doesn't reduce the value of automating and testing those measures
we *can* make.

> That's the way in which I believe that software engineering is
> fundamentally different from hardware engineering.

Not at all. There are many quality issues in hardware engineering that
defy simple measurement; that does not reduce the value of standardising
quality minima for those measures that *can* be achieved simply.

-- 
 \        ?Spam will be a thing of the past in two years' time.? ?Bill |
  `\                                                 Gates, 2004-01-24 |
_o__)                                                                  |
Ben Finney


From bruno.42.desthuilliers at websiteburo.invalid  Thu Mar  4 06:59:27 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 04 Mar 2010 12:59:27 +0100
Subject: Interest check in some delicious syntactic sugar for "except:pass"
In-Reply-To: <mailman.170.1267608442.23598.python-list@python.org>
References: <mailman.170.1267608442.23598.python-list@python.org>
Message-ID: <4b8fa091$0$24833$426a74cc@news.free.fr>

Oren Elrad a ?crit :
> Howdy all, longtime appreciative user, first time mailer-inner.
> 
> I'm wondering if there is any support (tepid better than none) for the
> following syntactic sugar:
> 
> silence:
> ........ block
> 
> ------------------------->
> 
> try:
> ........block
> except:
> ........pass
> 

Hopefully not.

> The logic here is that there are a ton of "except: pass" statements[1]
> floating around in code that do not need to be there.

s/do not need to be/NEVER should have been at first/





From mrkafk at gmail.com  Thu Mar  4 07:01:38 2010
From: mrkafk at gmail.com (mk)
Date: Thu, 04 Mar 2010 13:01:38 +0100
Subject: NoSQL Movement?
In-Reply-To: <6cc20cea1003031423v4410119dh767610e78ba3eb6e@mail.gmail.com>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<6cc20cea1003031423v4410119dh767610e78ba3eb6e@mail.gmail.com>
Message-ID: <hmo7f1$rhb$1@dough.gmane.org>

Jonathan Gardner wrote:

> When you are starting a new project and you don't have a definitive
> picture of what the data is going to look like or how it is going to
> be queried, SQL databases (like PostgreSQL) will help you quickly
> formalize and understand what your data needs to do. In this role,
> these databases are invaluable. I can see no comparable tool in the
> wild, especially not OODBMS.

FWIW, I talked to my promoting professor about the subject, and he 
claimed that there's quite a number of papers on OODBMS that point to 
fundamental problems with constructing capable query languages for 
OODBMS. Sadly, I have not had time to get & read those sources.

Regards,
mk



From duncan.booth at invalid.invalid  Thu Mar  4 07:21:26 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 4 Mar 2010 12:21:26 GMT
Subject: Generic singleton
References: <mailman.222.1267642515.23598.python-list@python.org>
	<pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>
Message-ID: <Xns9D317DB33C63Aduncanbooth@127.0.0.1>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:

> On Wed, 03 Mar 2010 19:54:52 +0100, mk wrote:
> 
>> Hello,
>> 
>> So I set out to write generic singleton, i.e. the one that would do a
>> singleton with attributes of specified class. At first:
> 
> Groan. What is it with the Singleton design pattern? It is one of the 
> least useful design patterns, and yet it's *everywhere* in Java and C++ 
> world.

It is also *everywhere* in the Python world. Unlike Java and C++, Python 
even has its own built-in type for singletons.

If you want a singleton in Python use a module.

So the OP's original examples become:

--- file singleton.py ---
foo = {}
bar = []

--- other.py ---
from singleton import foo as s1
from singleton import foo as s2
from singleton import bar as s3
from singleton import bar as s4

... and then use them as you wish.



-- 
Duncan Booth http://kupuguy.blogspot.com


From duncan.booth at invalid.invalid  Thu Mar  4 07:24:52 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 4 Mar 2010 12:24:52 GMT
Subject: memory usage, temporary and otherwise
References: <mailman.220.1267642060.23598.python-list@python.org>
Message-ID: <Xns9D317E4A4CAD5duncanbooth@127.0.0.1>

mk <mrkafk at gmail.com> wrote:

> Hm, apparently Python didn't spot that 'spam'*10 in a's values is really 
> the same string, right?

If you want it to spot that then give it a hint that it should be looking 
for identical strings:

 >>> a={}
 >>> for i in range(10000000):
...     a[i]=intern('spam'*10)

should reduce your memory use somewhat.

-- 
Duncan Booth http://kupuguy.blogspot.com


From J.Fine at open.ac.uk  Thu Mar  4 07:30:12 2010
From: J.Fine at open.ac.uk (Jonathan Fine)
Date: Thu, 04 Mar 2010 12:30:12 +0000
Subject: WANTED: A good name for the pair (args, kwargs)
Message-ID: <hmo94l$9hb$1@south.jnrs.ja.net>

Hi

We can call a function fn using
     val = fn(*args, **kwargs)

I'm looking for a good name for the pair (args, kwargs).  Any suggestions?

Here's my use case:
     def doit(fn , wibble, expect):
         args, kwargs = wibble
         actual = fn(*args, **kwargs)
         if actual != expect:
             # Something has gone wrong.
             pass

This is part of a test runner.

For now I'll use argpair, but if anyone has a better idea, I'll use it.

-- 
Jonathan


From mrkafk at gmail.com  Thu Mar  4 07:34:39 2010
From: mrkafk at gmail.com (mk)
Date: Thu, 04 Mar 2010 13:34:39 +0100
Subject: taking python enterprise level?...
In-Reply-To: <0C9B223A-D32A-474C-80E3-7F912447170F@semanchuk.com>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>	<20100302015813.5397655e.darcy@druid.net>	<hmm2jc$28u$1@dough.gmane.org>	<973824D8-3020-44A8-B2DA-501FF530457B@semanchuk.com>	<hmmih7$1bs$1@dough.gmane.org>
	<0C9B223A-D32A-474C-80E3-7F912447170F@semanchuk.com>
Message-ID: <hmo9cv$2nv$1@dough.gmane.org>

Philip Semanchuk wrote:
> Well OK, but that's a very different argument. Yes, joins can be 
> expensive. They're often still the best option, though. The first step 
> people usually take to get away from joins is denormalization which can 
> improve SELECT performance at the expense of slowing down INSERTs, 
> UPDATEs, and DELETEs, not to mention complicating one's code and data 
> model. Is that a worthwhile trade? 

I'd say that in more than 99% of situations: NO.

More than that: if I haven't normalized my data as it should have been 
normalized, I wouldn't be able to do complicated querying that I really, 
really have to be able to do due to business logic. A few of my queries 
have a few hundred lines each with many sub-queries and multiple 
many-to-many joins: I *dread the thought* what would happen if I had to 
reliably do it in a denormalized db and still ensure data integrity 
across all the business logic contexts. And performance is still more 
than good enough: so there's no point for me, as of the contexts I 
normally work in, to denormalize data at all.

It's just interesting for me to see what happens in that <1% of situations.

> Depends on the application. As I 
> said, sometimes the cure is worse than the disease.
> 
> Don't worry about joins until you know they're a problem. As Knuth said, 
> premature optimization is the root of all evil.

Sure -- the cost of joins is just interesting to me as a 'corner case'. 
I don't have datasets large enough for this to matter in the first place 
(and I probably won't have them that huge).

> PS - Looks like you're using Postgres -- excellent choice. I miss using it.

If you can, I'd recommend using SQLAlchemy layer on top of 
Oracle/Mysql/Sqlite, if that's what you have to use: this *largely* 
insulates you from the problems below and it does the job of translating 
into a peculiar dialect very well. For my purposes, SQLAlchemy worked 
wonderfully: it's very flexible, it has middle-level sql expression 
language if normal querying is not flexible enough (and normal querying 
is VERY flexible), it has a ton of nifty features like autoloading and 
rarely fails bc of some lower-level DB quirk AND its high-level object 
syntax is so similar to SQL that you quickly & intuitively grasp it.

(and if you have to/prefer writing some query in "low-level" SQL, as I 
have done a few times, it's still easy to make SQLAlchemy slurp the 
result into objects provided you ensure there are all of the necessary 
columns in the query result)

Regards,
mk



From spamfresser at ch3ka.de  Thu Mar  4 07:41:22 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Thu, 04 Mar 2010 13:41:22 +0100
Subject: How to login https sever with inputing account name and password?
In-Reply-To: <mailman.281.1267704055.23598.python-list@python.org>
References: <mailman.281.1267704055.23598.python-list@python.org>
Message-ID: <hmo9po$bvj$1@news.urz.uni-heidelberg.de>

Am 04.03.2010 11:38, schrieb Karen Wang:
> Hi all,
>
> I want to use python to access to https server, like
> "https://212.218.229.10/chinatest/"
>
> If open it from IE, will see the pop-up login windows like this
>
>
>
> I tried several ways but always only get page for" HTTP Error 401.2 -
> Unauthorized" error. ( myusername and mypassword are all correct)
>
> Below is my code:
>
> import urllib2
>
> values = {
>
>      'user' : "myusername",
>
> "pass' : "mypassword" }
>
> data = urllib2.urlencode(values)
>
> t = urllib2.urlopen('https://212.218.229.10/chinatest/',data)
>
> print t.read()
>
> where I am wrong ?

AFAIR does urlopen() expect the password to be Base64-encoded, not 
urlencoded.

You might also need to add an AUTH-Line. But this all does not matter, 
as there is more than one AUTH-Method you'd have to implement them all, 
but fortunately urllib2.HTTPBasicAuthHandler and 
urllib2.HTTPBasicAuthHandler exist.

So use them:

import urllib2
passman = urllib2.HTTPPasswordMgrWithDefaultRealm()
passman.add_password(None, theurl, username, password)
authhandler = urllib2.HTTPBasicAuthHandler(passman)
opener = urllib2.build_opener(authhandler)
urllib2.install_opener(opener)
pagehandle = urllib2.urlopen(theurl)

(taken from 
http://www.voidspace.org.uk/python/articles/authentication.shtml )

Further reference:
http://www.python.org/doc/2.5.2/lib/module-urllib2.html
http://www.python.org/doc/2.5.2/lib/urllib2-examples.html

HTH,
Michael


From william302888 at gmail.com  Thu Mar  4 07:42:50 2010
From: william302888 at gmail.com (jack)
Date: Thu, 4 Mar 2010 04:42:50 -0800 (PST)
Subject: 15541 - Best, Cheapest Web-Hosting, Domain at $1.99!
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From python.list at tim.thechases.com  Thu Mar  4 07:50:14 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Thu, 04 Mar 2010 06:50:14 -0600
Subject: WANTED: A good name for the pair (args, kwargs)
In-Reply-To: <hmo94l$9hb$1@south.jnrs.ja.net>
References: <hmo94l$9hb$1@south.jnrs.ja.net>
Message-ID: <4B8FAC86.4020605@tim.thechases.com>

Jonathan Fine wrote:
> We can call a function fn using
>      val = fn(*args, **kwargs)
> 
> I'm looking for a good name for the pair (args, kwargs).  Any suggestions?
> 
> For now I'll use argpair, but if anyone has a better idea, I'll use it.

In the legacy of C and Java (okay, that doesn't carry _much_ 
weight with me), I'd go with "varargs" to refer to the pair of 
(args, kwargs)

-tkc





From anand.shashwat at gmail.com  Thu Mar  4 07:54:27 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Thu, 4 Mar 2010 18:24:27 +0530
Subject: How to login https sever with inputing account name and password?
In-Reply-To: <hmo9po$bvj$1@news.urz.uni-heidelberg.de>
References: <mailman.281.1267704055.23598.python-list@python.org> 
	<hmo9po$bvj$1@news.urz.uni-heidelberg.de>
Message-ID: <d4ab53de1003040454o49d569cdqce73dcfb12d0d734@mail.gmail.com>

You may also want to look into mechanize module.

On Thu, Mar 4, 2010 at 6:11 PM, Michael Rudolf <spamfresser at ch3ka.de> wrote:

> Am 04.03.2010 11:38, schrieb Karen Wang:
>
>  Hi all,
>>
>> I want to use python to access to https server, like
>> "https://212.218.229.10/chinatest/"
>>
>> If open it from IE, will see the pop-up login windows like this
>>
>>
>>
>> I tried several ways but always only get page for" HTTP Error 401.2 -
>> Unauthorized" error. ( myusername and mypassword are all correct)
>>
>> Below is my code:
>>
>> import urllib2
>>
>> values = {
>>
>>     'user' : "myusername",
>>
>> "pass' : "mypassword" }
>>
>> data = urllib2.urlencode(values)
>>
>> t = urllib2.urlopen('https://212.218.229.10/chinatest/',data)
>>
>> print t.read()
>>
>> where I am wrong ?
>>
>
> AFAIR does urlopen() expect the password to be Base64-encoded, not
> urlencoded.
>
> You might also need to add an AUTH-Line. But this all does not matter, as
> there is more than one AUTH-Method you'd have to implement them all, but
> fortunately urllib2.HTTPBasicAuthHandler and urllib2.HTTPBasicAuthHandler
> exist.
>
> So use them:
>
> import urllib2
> passman = urllib2.HTTPPasswordMgrWithDefaultRealm()
> passman.add_password(None, theurl, username, password)
> authhandler = urllib2.HTTPBasicAuthHandler(passman)
> opener = urllib2.build_opener(authhandler)
> urllib2.install_opener(opener)
> pagehandle = urllib2.urlopen(theurl)
>
> (taken from
> http://www.voidspace.org.uk/python/articles/authentication.shtml )
>
> Further reference:
> http://www.python.org/doc/2.5.2/lib/module-urllib2.html
> http://www.python.org/doc/2.5.2/lib/urllib2-examples.html
>
> HTH,
> Michael
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From duncan.booth at invalid.invalid  Thu Mar  4 08:10:34 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 4 Mar 2010 13:10:34 GMT
Subject: NoSQL Movement?
References: <mailman.256.1267655008.23598.python-list@python.org>
	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
Message-ID: <Xns9D318550EF1D6duncanbooth@127.0.0.1>

Avid Fan <me at privacy.net> wrote:

> Jonathan Gardner wrote:
> 
>> 
>> I see it as a sign of maturity with sufficiently scaled software that
>> they no longer use an SQL database to manage their data. At some 
point
>> in the project's lifetime, the data is understood well enough that 
the
>> general nature of the SQL database is unnecessary.
>> 
> 
> I am really struggling to understand this concept.
> 
> Is it the normalised table structure that is in question or the query 
> language?
> 
> Could you give some sort of example of where SQL would not be the way 
to 
> go.   The only things I can think of a simple flat file databases.

Probably one of the best known large non-sql databases is Google's 
bigtable. Xah Lee of course dismissed this as he decided to write how 
bad non-sql databases are without actually looking at the prime example.

If you look at some of the uses of bigtable you may begin to understand 
the tradeoffs that are made with sql. When you use bigtable you have 
records with fields, and you have indices, but there are limitations on 
the kinds of queries you can perform: in particular you cannot do joins, 
but more subtly there is no guarantee that the index is up to date (so 
you might miss recent updates or even get data back from a query when 
the data no longer matches the query).

By sacrificing some of SQL's power, Google get big benefits: namely 
updating data is a much more localised option. Instead of an update 
having to lock the indices while they are updated, updates to different 
records can happen simultaneously possibly on servers on the opposite 
sides of the world. You can have many, many servers all using the same 
data although they may not have identical or completely consistent views 
of that data.

Bigtable impacts on how you store the data: for example you need to 
avoid reducing data to normal form (no joins!), its much better and 
cheaper just to store all the data you need directly in each record. 
Also aggregate values need to be at least partly pre-computed and stored 
in the database.

Boiling this down to a concrete example, imagine you wanted to implement 
a system like twitter. Think carefully about how you'd handle a 
sufficiently high rate of new tweets reliably with a sql database. Now 
think how you'd do the same thing with bigtable: most tweets don't 
interact, so it becomes much easier to see how the load is spread across 
the servers: each user has the data relevant to them stored near the 
server they are using and index changes propagate gradually to the rest 
of the system.

-- 
Duncan Booth http://kupuguy.blogspot.com


From eric.brunel.pragmadev at gmail.com  Thu Mar  4 08:20:43 2010
From: eric.brunel.pragmadev at gmail.com (eb303)
Date: Thu, 4 Mar 2010 05:20:43 -0800 (PST)
Subject: Instance factory - am I doing this right?
References: <mailman.212.1267638104.23598.python-list@python.org>
Message-ID: <a289fa45-dfae-4200-bb3a-745a4fe0d7cd@q21g2000yqm.googlegroups.com>

On Mar 3, 6:41?pm, Laszlo Nagy <gand... at shopzeus.com> wrote:
> This is just an interesting code pattern that I have recently used:
>
> class CacheStorage(object):
> ? ? """Generic cache storage class."""
> ? ? @classmethod
> ? ? def get_factory(cls,*args,**kwargs):
> ? ? ? ? """Create factory for a given set of cache storage creation
> parameters."""
> ? ? ? ? class CacheStorageFactory(cls):
> ? ? ? ? ? ? _construct_args = args
> ? ? ? ? ? ? _construct_kwargs = kwargs
> ? ? ? ? ? ? def __init__(self):
> ? ? ? ? ? ? ? ? cls.__init__(self,
> ? ? ? ? ? ? ? ? ? ? *self._construct_args,**self._construct_kwargs)
> ? ? ? ? return CacheStorageFactory
>
> Then, I can create subclasses like:
>
> class GdbmCacheStorage(CacheStorage):
> ? ? """Gdbm cache storage class.
>
> ? ? @param basedir: Base directory where gdbm files should be stored.
> ? ? @param basename: Base name for logging and creating gdbm files.
> ? ? """
> ? ? def __init__(self,basedir,basename):
> ? ? ? ? ? ..... blablabla place initialization code here
>
> class MemoryCacheStorage(CacheStorage):
> ? ? """In-Memory cache storage class.
>
> ? ? Please note that keys and values are always mashal-ed.
> ? ? E.g. when you cache an object, it makes a deep copy.
> ? ? """
> ? ? def __init__(self):
> ? ? ? ? ? ..... blablabla place initialization code here
>
> And the finally, I can create a factory that can create cache storage
> instances for storing data in gdbm in a given directory:
>
> cache_factory = GdbmCacheStorage.get_factory("~gandalf/db","test")
> print cache_factory # <class '__main__.CacheStorageFactory'>
> print cache_factory()
>
> OR I can create a factory that can create instances for storing data in
> memory:
>
> cache_factory = MemoryCacheStorage.get_factory()
> print cache_factory # <class '__main__.CacheStorageFactory'>
> print cache_factory() # <__main__.CacheStorageFactory object at 0x8250c6c>
>
> Now, here is my question. Am I right in doing this? Or are there better
> language tools to be used in Python for the same thing? This whole thing
> about creating factories looks a bit odd for me. Is it Pythonic enough?
>
> Thanks,
>
> ? ?Laszlo

Seems you try to reinvent functools:

class GdbmCacheStorage(object):
  def __init__(self,basedir,basename):
    ...
cache_factory = functools.partial(GdbmCacheStorage, "~gandalf/db",
"test")
print cache_factory()

Is it what you're after? I didn't see the point in creating a "cached
factory" for MemoryCacheStorage though, since it has no constructor
parameters to cache anyway. So doing 'cache_factory =
MemoryCacheStorage' in your example would do exactly the same thing as
what you did.

HTH
 - Eric -


From phd at phd.pp.ru  Thu Mar  4 08:34:05 2010
From: phd at phd.pp.ru (Oleg Broytman)
Date: Thu, 4 Mar 2010 16:34:05 +0300
Subject: SQLObject 0.11.4
Message-ID: <20100304133404.GB4443@phd.pp.ru>

Hello!

I'm pleased to announce version 0.11.4, a minor bugfix release of 0.11 branch
of SQLObject.


What is SQLObject
=================

SQLObject is an object-relational mapper.  Your database tables are described
as classes, and rows are instances of those classes.  SQLObject is meant to be
easy to use and quick to get started with.

SQLObject supports a number of backends: MySQL, PostgreSQL, SQLite,
Firebird, Sybase, MSSQL and MaxDB (also known as SAPDB).


Where is SQLObject
==================

Site:
http://sqlobject.org

Development:
http://sqlobject.org/devel/

Mailing list:
https://lists.sourceforge.net/mailman/listinfo/sqlobject-discuss

Archives:
http://news.gmane.org/gmane.comp.python.sqlobject

Download:
http://cheeseshop.python.org/pypi/SQLObject/0.11.4

News and changes:
http://sqlobject.org/News.html


What's New
==========

News since 0.11.3
-----------------

* Fixed a bug in inheritance - if creation of the row failed and if the
  connection is not a transaction and is in autocommit mode - remove
  parent row(s).

* Do not set _perConnection flag if get() or _init() is passed the same
  connection; this is often the case with select().

For a more complete list, please see the news:
http://sqlobject.org/News.html

Oleg.
-- 
     Oleg Broytman            http://phd.pp.ru/            phd at phd.pp.ru
           Programmers don't die, they just GOSUB without RETURN.


From jjposner at optimum.net  Thu Mar  4 08:35:05 2010
From: jjposner at optimum.net (John Posner)
Date: Thu, 04 Mar 2010 08:35:05 -0500
Subject: Method / Functions - What are the differences?
In-Reply-To: <4b8f9267$0$17832$426a74cc@news.free.fr>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
	<mailman.109.1267539415.23598.python-list@python.org>
	<hmk1mn$70u$1@newsreader3.netcologne.de>
	<4b8e4041$0$17447$426a34cc@news.free.fr>
	<hmlte9$d0f$1@dough.gmane.org>
	<mailman.205.1267633968.23598.python-list@python.org>
	<4b8e9660$0$21812$426a34cc@news.free.fr>
	<hmmrh4$644$1@newsreader3.netcologne.de>
	<4b8f9267$0$17832$426a74cc@news.free.fr>
Message-ID: <4B8FB709.9080609@optimum.net>

On 3/4/2010 5:59 AM, Bruno Desthuilliers wrote:
>>
>> I have two small ideas for improvement: - Swap the first two
>> paragraphs. First say what it is, and then give the motivation.
>
> Mmm... As far as I'm concerned, I like it the way its. John ?

I think it doesn't make very much difference. But in the end, I believe 
it's the student, not the teacher, who gets to decide what's comprehensible.

What *does* make a difference, IMHO, is getting more people to 
participate in the process of shining lights into Python's darker 
corners. That's why I encouraged (and still encourage) Eike to roll up 
the sleeves and wade into these waters.

Metaphor-mixingly yours,
John


From no.email at nospam.invalid  Thu Mar  4 08:37:59 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Thu, 04 Mar 2010 05:37:59 -0800
Subject: WANTED: A good name for the pair (args, kwargs)
References: <hmo94l$9hb$1@south.jnrs.ja.net>
Message-ID: <7x8wa85hs8.fsf@ruckus.brouhaha.com>

Jonathan Fine <J.Fine at open.ac.uk> writes:
> I'm looking for a good name for the pair (args, kwargs).  Any suggestions?
>
> Here's my use case:
>     def doit(fn , wibble, expect):
>         args, kwargs = wibble
>         actual = fn(*args, **kwargs)

I think this may have been broken in 3.x, but in 2.6 the compiler will
unpack directly if you put a tuple structure in the arg list:

         def doit(fn, (args, kwargs), expect):
             actual = fn(*args, **kwargs)

Otherwise I'd just say "all_args" or some such.  Or just "args" which
you unpack into "pos_args" (positional args) and "kw_args".


From phd at phd.pp.ru  Thu Mar  4 08:41:46 2010
From: phd at phd.pp.ru (Oleg Broytman)
Date: Thu, 4 Mar 2010 16:41:46 +0300
Subject: SQLObject 0.12.2
Message-ID: <20100304134146.GF4443@phd.pp.ru>

Hello!

I'm pleased to announce version 0.12.2, a bugfix release of branch 0.12
of SQLObject.


What is SQLObject
=================

SQLObject is an object-relational mapper.  Your database tables are described
as classes, and rows are instances of those classes.  SQLObject is meant to be
easy to use and quick to get started with.

SQLObject supports a number of backends: MySQL, PostgreSQL, SQLite,
Firebird, Sybase, MSSQL and MaxDB (also known as SAPDB).


Where is SQLObject
==================

Site:
http://sqlobject.org

Development:
http://sqlobject.org/devel/

Mailing list:
https://lists.sourceforge.net/mailman/listinfo/sqlobject-discuss

Archives:
http://news.gmane.org/gmane.comp.python.sqlobject

Download:
http://cheeseshop.python.org/pypi/SQLObject/0.12.2

News and changes:
http://sqlobject.org/News.html


What's New
==========

News since 0.12.1
-----------------

* Fixed a bug in inheritance - if creation of the row failed and if the
  connection is not a transaction and is in autocommit mode - remove
  parent row(s).

* Do not set _perConnection flag if get() or _init() is passed the same
  connection; this is often the case with select().

For a more complete list, please see the news:
http://sqlobject.org/News.html

Oleg.
-- 
     Oleg Broytman            http://phd.pp.ru/            phd at phd.pp.ru
           Programmers don't die, they just GOSUB without RETURN.


From bieffe62 at gmail.com  Thu Mar  4 08:45:40 2010
From: bieffe62 at gmail.com (Francesco Bochicchio)
Date: Thu, 4 Mar 2010 05:45:40 -0800 (PST)
Subject: Passing FILE * types using ctypes
References: <a83319d7-c199-4532-9816-d002f7fd7914@q16g2000yqq.googlegroups.com>
Message-ID: <bac1318c-d5a2-4dfc-a716-2977959f7a06@b30g2000yqd.googlegroups.com>

On Mar 4, 12:50?am, Zeeshan Quireshi <zeeshan.quire... at gmail.com>
wrote:
> Hello, I'm using ctypes to wrap a library i wrote. I am trying to pass
> it a FILE *pointer, how do i open a file in Python and convert it to a
> FILE *pointer. Or do i have to call the C library using ctypes first,
> get the pointer and then pass it to my function.
>
> Also, is there any automated way to convert c struct and enum
> definitions to ctypes data types.
>
> Zeeshan

Python file objects have a method fileno() whic returns the 'C file
descriptor', i.e. the number used by low level IO in python as well as
in C.
I would use this as interface between python and C and then in the C
function using fdopen to get a FILE * for an already open file for
which you have a file descriptor.

If you don't want change the C interface, you could try using fdopen
in python by loading the standard C library ang using ctypes
to call the function. (I tried briefly but always get 0 from fdopen ).

But if you can change the C code, why not to pass the file name? The
idea of opening the file in python and manage it in C feels a bit
icky ...

Ciao
----
FB



From cartercc at gmail.com  Thu Mar  4 09:21:49 2010
From: cartercc at gmail.com (ccc31807)
Date: Thu, 4 Mar 2010 06:21:49 -0800 (PST)
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com> 
	<26bd4a5c-4d66-4597-a0ee-b4990f468e68@g26g2000yqn.googlegroups.com>
Message-ID: <e0a86785-bb68-4977-8864-010ca4f71a6c@19g2000yqu.googlegroups.com>

On Mar 3, 4:55?pm, toby <t... at telegraphics.com.au> wrote:
> > ?where you have to store data and
>
> "relational data"

Data is neither relational nor unrelational. Data is data.
Relationships are an artifact, something we impose on the data.
Relations are for human convenience, not something inherent in the
data itself.

> > perform a large number of queries.
>
> Why does the number matter?

Have you ever had to make a large number of queries to an XML
database? In some ways, an XML database is the counterpart to a
relational database in that the data descriptions constitute the
relations. However, since the search is to the XML elements, and you
can't construct indicies for XML databases in the same way you can
with relational databases, a large search can take much longer that
you might expect.

CC.


From jmg3000 at gmail.com  Thu Mar  4 09:39:51 2010
From: jmg3000 at gmail.com (John Gabriele)
Date: Thu, 4 Mar 2010 06:39:51 -0800 (PST)
Subject: Working group for Python CPAN-equivalence?
References: <mailman.179.1267620332.23598.python-list@python.org> 
	<87r5o1v8vp.fsf@benfinney.id.au>
	<4b8e929d$0$1585$742ec2ed@news.sonic.net> 
	<hmmiks$1ru$1@dough.gmane.org>
	<6cc20cea1003031417i15b66bcdi454bba5a9c642d95@mail.gmail.com> 
	<mailman.261.1267659815.23598.python-list@python.org>
	<871vg0bzua.fsf@castleamber.com>
Message-ID: <8506d9dc-2e6d-4f66-9d55-8173f47f7d4e@i25g2000yqm.googlegroups.com>

On Mar 3, 9:11?pm, John Bokma <j... at castleamber.com> wrote:
> Philip Semanchuk <phi... at semanchuk.com> writes:
>
> > In other words, if I was a Perl user under Ubuntu would I use
> > the pkg manager to add a Perl module, or CPAN, or would both work?
>
> Both would work, but I would make very sure to use a separate
> installation directory for modules installed via CPAN.

What's worked best for me is: use *only* the apt system to install
modules into your system Perl (`/usr/bin/perl`) and use *only* cpan/
cpanp/cpanm to install modules into *your own* Perl (for example, you
may have installed into `/opt`).

> AFAIK there are also programs that pack CPAN modules/bundles into
> something the package manager can use to install.

Right. If you really want to install a module for which there's no
Debian package, and you don't want to install your own Perl, this is a
good route to take.

Incidentally, this is the same way I recommend handling the situation
with Python: Use only aptitude to install packages for your system
Python, and use only pip to install packages into your own Python
(which you built and installed elsewhere, ex., `/opt/py-2.6.4`).

---John


From mrkafk at gmail.com  Thu Mar  4 09:47:22 2010
From: mrkafk at gmail.com (mk)
Date: Thu, 04 Mar 2010 15:47:22 +0100
Subject: NoSQL Movement?
In-Reply-To: <Xns9D318550EF1D6duncanbooth@127.0.0.1>
References: <mailman.256.1267655008.23598.python-list@python.org>	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
	<Xns9D318550EF1D6duncanbooth@127.0.0.1>
Message-ID: <hmoh5p$16e$1@dough.gmane.org>

Duncan Booth wrote:

> If you look at some of the uses of bigtable you may begin to understand 
> the tradeoffs that are made with sql. When you use bigtable you have 
> records with fields, and you have indices, but there are limitations on 
> the kinds of queries you can perform: in particular you cannot do joins, 
> but more subtly there is no guarantee that the index is up to date (so 
> you might miss recent updates or even get data back from a query when 
> the data no longer matches the query).

Hmm, I do understand that bigtable is used outside of traditional 
'enterprisey' contexts, but suppose you did want to do an equivalent of 
join; is it at all practical or even possible?

I guess when you're forced to use denormalized data, you have to 
simultaneously update equivalent columns across many tables yourself, 
right? Or is there some machinery to assist in that?

> By sacrificing some of SQL's power, Google get big benefits: namely 
> updating data is a much more localised option. Instead of an update 
> having to lock the indices while they are updated, updates to different 
> records can happen simultaneously possibly on servers on the opposite 
> sides of the world. You can have many, many servers all using the same 
> data although they may not have identical or completely consistent views 
> of that data.

And you still have the global view of the table spread across, say, 2 
servers, one located in Australia, second in US?

> Bigtable impacts on how you store the data: for example you need to 
> avoid reducing data to normal form (no joins!), its much better and 
> cheaper just to store all the data you need directly in each record. 
> Also aggregate values need to be at least partly pre-computed and stored 
> in the database.

So you basically end up with a few big tables or just one big table really?

Suppose on top of 'tweets' table you have 'dweebs' table, and tweets and 
dweebs sometimes do interact. How would you find such interacting pairs? 
Would you say "give me some tweets" to tweets table, extract all the 
dweeb_id keys from tweets and then retrieve all dweebs from dweebs table?

> Boiling this down to a concrete example, imagine you wanted to implement 
> a system like twitter. Think carefully about how you'd handle a 
> sufficiently high rate of new tweets reliably with a sql database. Now 
> think how you'd do the same thing with bigtable: most tweets don't 
> interact, so it becomes much easier to see how the load is spread across 
> the servers: each user has the data relevant to them stored near the 
> server they are using and index changes propagate gradually to the rest 
> of the system.

I guess that in a purely imaginary example, you could also combine two 
databases? Say, a tweet bigtable db contains tweet, but with column of 
classical customer_id key that is also a key in traditional RDBMS 
referencing particular customer?

Regards,
mk




From tim.wintle at teamrubber.com  Thu Mar  4 10:23:33 2010
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 04 Mar 2010 15:23:33 +0000
Subject: taking python enterprise level?...
In-Reply-To: <hmmdtn$fkn$1@dough.gmane.org>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>
	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>
	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>
	<20100302015813.5397655e.darcy@druid.net>	<hmm2jc$28u$1@dough.gmane.org>
	<1267638602.988.19.camel@localhost>  <hmmdtn$fkn$1@dough.gmane.org>
Message-ID: <1267716213.23300.7.camel@localhost>

On Wed, 2010-03-03 at 20:39 +0100, mk wrote:
> Hello Tim,
> 
> Pardon the questions but I haven't had the need to use denormalization 
> yet, so:

> IOW you basically merged the tables like follows?
> 
> CREATE TABLE projects (
>      client_id BIGINT NOT NULL,
>      project_id BIGINT NOT NULL,
>      cost INT,
>      date DATETIME,
>      INDEX(client_id, project_id, date)
> );

Yup

> From what you write further in the mail I conclude that you have not 
> eliminated the first table, just made table projects look like I wrote 
> above, right? (and used stored procedures to make sure that both tables 
> contain the relevant data for client_id and project_id columns in both 
> tables)

Yup

> Have you had some other joins on denormalized keys? i.e. in example how 
> the join of hypothetical TableB with projects on projects.client_id 
> behave with such big tables? (bc I assume that you obviously can't 
> denormalize absolutely everything, so this implies the need of doing 
> some joins on denormalized columns like client_id).

For these joins (for SELECT statements) this _can_ end up running faster
- of course all of this depends on what kind of queries you normally end
up getting and the distribution of data in the indexes.

I've never written anything that started out with a schema like this,
but several have ended up getting denormalised as the projects have
matured and query behaviour has been tested

> > assuming you can access the first mapping anyway -
> 
> ? I'm not clear on what you mean here.

I'm refering to not eliminating the first table as you concluded

> 
> Regards,
> mk
> 



From tim.wintle at teamrubber.com  Thu Mar  4 10:29:23 2010
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 04 Mar 2010 15:29:23 +0000
Subject: taking python enterprise level?...
In-Reply-To: <20100303162314.a46484cf.darcy@druid.net>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>
	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>
	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>
	<20100302015813.5397655e.darcy@druid.net>
	<hmm2jc$28u$1@dough.gmane.org>
	<1267638602.988.19.camel@localhost> <hmmdtn$fkn$1@dough.gmane.org>
	<20100303162314.a46484cf.darcy@druid.net>
Message-ID: <1267716563.23300.13.camel@localhost>

On Wed, 2010-03-03 at 16:23 -0500, D'Arcy J.M. Cain wrote:
> On Wed, 03 Mar 2010 20:39:35 +0100
> mk <mrkafk at gmail.com> wrote:
> > > If you denormalise the table, and update the first index to be on
> > > (client_id, project_id, date) it can end up running far more quickly -
> 
> Maybe.  Don't start with denormalization.  Write it properly and only
> consider changing if profiling suggests that that is your bottleneck.

Quite - and I'd add to cache reads as much in front end machines as is
permissible in your use case before considering denormalisation.

> With a decent database engine and proper design it will hardly ever be.

I completely agree - I'm simply responding to the request for an example
where denormalisation may be a good idea.

Tim



From jmg3000 at gmail.com  Thu Mar  4 10:47:11 2010
From: jmg3000 at gmail.com (John Gabriele)
Date: Thu, 4 Mar 2010 07:47:11 -0800 (PST)
Subject: Working group for Python CPAN-equivalence?
References: <mailman.179.1267620332.23598.python-list@python.org> 
	<87r5o1v8vp.fsf@benfinney.id.au>
	<4b8e929d$0$1585$742ec2ed@news.sonic.net> 
	<mailman.239.1267650035.23598.python-list@python.org>
	<87eik1ujg4.fsf@benfinney.id.au>
Message-ID: <1f9fcfb3-204c-48c6-8142-9f7c2607b917@t20g2000yqe.googlegroups.com>

On Mar 3, 5:30?pm, Ben Finney <ben+pyt... at benfinney.id.au> wrote:
>
> Terry Reedy <tjre... at udel.edu> writes:
>
> > On 3/3/2010 12:05 PM, John Nagle wrote:
>
> > > CPAN enforces standard organization on packages. PyPi does not.
>
> This is, I think, something we don't need as much in Python; there is a
> fundamental difference between Perl's deeply nested namespace hierarchy
> and Python's inherently flat hierarchy.

What do you think that difference is? Both use nested namespaces. My
understanding is that if 2 different dists contain like-named
packages, and if a user installs both of them, they all just go to the
same place in the user's site-packages dir.

One difference I see is that the CPAN has a *lot* of dist's which
constitute a very large number of modules. Keeping them organized by a
semi-agreed-upon hierarchy of packages seems like a great
organizational tool.

---John


From robert.kern at gmail.com  Thu Mar  4 10:48:41 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 04 Mar 2010 09:48:41 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <hmn03d$5r6$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>
	<hmn03d$5r6$1@news.eternal-september.org>
Message-ID: <hmokoq$g74$1@dough.gmane.org>

On 2010-03-03 18:49 PM, Alf P. Steinbach wrote:
> * Robert Kern:
>> On 2010-03-03 15:35 PM, Alf P. Steinbach wrote:
>>> * Robert Kern:
>>>> On 2010-03-03 13:32 PM, Alf P. Steinbach wrote:
>>>>> * Robert Kern:
>>>>>> On 2010-03-03 11:18 AM, Alf P. Steinbach wrote:
>>>>>>> * Robert Kern:
>>>>>>>> On 2010-03-03 09:56 AM, Alf P. Steinbach wrote:
>>>>>>>>> * Mike Kent:
>>>>>>>>>> What's the compelling use case for this vs. a simple try/finally?
>>>>>>>>>
>>>>>>>>> if you thought about it you would mean a simple "try/else".
>>>>>>>>> "finally" is
>>>>>>>>> always executed. which is incorrect for cleanup
>>>>>>>>
>>>>>>>> Eh? Failed execution doesn't require cleanup? The example you
>>>>>>>> gave is
>>>>>>>> definitely equivalent to the try: finally: that Mike posted.
>>>>>>>
>>>>>>> Sorry, that's incorrect: it's not.
>>>>>>>
>>>>>>> With correct code (mine) cleanup for action A is only performed when
>>>>>>> action A succeeds.
>>>>>>>
>>>>>>> With incorrect code cleanup for action A is performed when A fails.
>>>>>>
>>>>>> Oh?
>>>>>>
>>>>>> $ cat cleanup.py
>>>>>>
>>>>>> class Cleanup:
>>>>>> def __init__( self ):
>>>>>> self._actions = []
>>>>>>
>>>>>> def call( self, action ):
>>>>>> assert( callable( action ) )
>>>>>> self._actions.append( action )
>>>>>>
>>>>>> def __enter__( self ):
>>>>>> return self
>>>>>>
>>>>>> def __exit__( self, x_type, x_value, x_traceback ):
>>>>>> while( len( self._actions ) != 0 ):
>>>>>> try:
>>>>>> self._actions.pop()()
>>>>>> except BaseException as x:
>>>>>> raise AssertionError( "Cleanup: exception during cleanup" )
>>>>>>
>>>>>> def print_(x):
>>>>>> print x
>>>>>>
>>>>>> with Cleanup() as at_cleanup:
>>>>>> at_cleanup.call(lambda: print_("Cleanup executed without an
>>>>>> exception."))
>>>>>>
>>>>>> with Cleanup() as at_cleanup:
>>>>>
>>>>> *Here* is where you should
>>>>>
>>>>> 1) Perform the action for which cleanup is needed.
>>>>>
>>>>> 2) Let it fail by raising an exception.
>>>>>
>>>>>
>>>>>> at_cleanup.call(lambda: print_("Cleanup execute with an exception."))
>>>>>> raise RuntimeError()
>>>>>
>>>>> With an exception raised here cleanup should of course be performed.
>>>>>
>>>>> And just in case you didn't notice: the above is not a test of the
>>>>> example I gave.
>>>>>
>>>>>
>>>>>> $ python cleanup.py
>>>>>> Cleanup executed without an exception.
>>>>>> Cleanup execute with an exception.
>>>>>> Traceback (most recent call last):
>>>>>> File "cleanup.py", line 28, in <module>
>>>>>> raise RuntimeError()
>>>>>> RuntimeError
>>>>>>
>>>>>>>> The actions are always executed in your example,
>>>>>>>
>>>>>>> Sorry, that's incorrect.
>>>>>>
>>>>>> Looks like it to me.
>>>>>
>>>>> I'm sorry, but you're
>>>>>
>>>>> 1) not testing my example which you're claiming that you're
>>>>> testing, and
>>>>
>>>> Then I would appreciate your writing a complete, runnable example that
>>>> demonstrates the feature you are claiming. Because it's apparently not
>>>> "ensur[ing] some desired cleanup at the end of a scope, even when the
>>>> scope is exited via an exception" that you talked about in your
>>>> original post.
>>>>
>>>> Your sketch of an example looks like mine:
>>>>
>>>> with Cleanup as at_cleanup:
>>>> # blah blah
>>>> chdir( somewhere )
>>>> at_cleanup.call( lambda: chdir( original_dir ) )
>>>> # blah blah
>>>>
>>>> The cleanup function gets registered immediately after the first
>>>> chdir() and before the second "blah blah". Even if an exception is
>>>> raised in the second "blah blah", then the cleanup function will still
>>>> run. This would be equivalent to a try: finally:
>>>>
>>>> # blah blah #1
>>>> chdir( somewhere )
>>>> try:
>>>> # blah blah #2
>>>> finally:
>>>> chdir( original_dir )
>>>
>>> Yes, this is equivalent code.
>>>
>>> The try-finally that you earlier claimed was equivalent, was not.
>>
>> Okay, but just because of the position of the chdir(), right?
>
> Yes, since it yields different results.
>
>>>> and not a try: else:
>>>>
>>>> # blah blah #1
>>>> chdir( somewhere )
>>>> try:
>>>> # blah blah #2
>>>> else:
>>>> chdir( original_dir )
>>>
>>> This example is however meaningless except as misdirection. There are
>>> infinitely many constructs that include try-finally and try-else, that
>>> the with-Cleanup code is not equivalent to. It's dumb to show one such.
>>>
>>> Exactly what are you trying to prove here?
>>
>> I'm just showing you what I thought you meant when you told Mike that
>> he should have used a try/else instead of try/finally.
>>
>>> Your earlier claims are still incorrect.
>>>
>>>> Now, I assumed that the behavior with respect to exceptions occurring
>>>> in the first "blah blah" weren't what you were talking about because
>>>> until the chdir(), there is nothing to clean up.
>>>>
>>>> There is no way that the example you gave translates to a try: else:
>>>> as you claimed in your response to Mike Kent.
>>>
>>> Of course there is.
>>>
>>> Note that Mike wrapped the action A within the 'try':
>>>
>>>
>>> <code author="Mike" correct="False">
>>> original_dir = os.getcwd()
>>> try:
>>> os.chdir(somewhere)
>>> # Do other stuff
>>> finally:
>>> os.chdir(original_dir)
>>> # Do other cleanup
>>> </code>
>>>
>>>
>>> The 'finally' he used, shown above, yields incorrect behavior.
>>>
>>> Namely cleanup always, while 'else', in that code, can yield correct
>>> behavior /provided/ that it's coded correctly:
>>>
>>>
>>> <code author="Alf" correct="ProbablyTrue" disclaimer="off the cuff">
>>> original_dir = os.getcwd()
>>> try:
>>> os.chdir(somewhere)
>>> except Whatever:
>>> # whatever, e.g. logging
>>> raise
>>> else:
>>> try:
>>> # Do other stuff
>>> finally:
>>> os.chdir(original_dir)
>>> # Do other cleanup
>>> </code>
>>
>> Ah, okay. Now we're getting somewhere. Now, please note that you did
>> not have any except: handling in your original example. So Mike made a
>> try: finally: example to attempt to match the semantics of your code.
>> When you tell him that he should 'mean a simple "try/else". "finally"
>> is always executed. which is incorrect for cleanup', can you
>> understand why we might think that you were saying that try: finally:
>> was wrong and that you were proposing that your code was equivalent to
>> some try: except: else: suite?
>
> No, not really. His code didn't match the semantics. Changing 'finally'
> to 'else' could make it equivalent.

Okay, please show me what you mean by "changing 'finally' to 'else'." I think 
you are being hinty again. It's not helpful. The most straightforward 
interpretation of those words means that you literally just want to remove the 
word 'finally' and replace it with 'else' in Mike's example. Obviously you don't 
mean that because it is a syntax error. try: else: is not a construct in Python. 
There is a try: except: else:, but there is no point to doing that if you don't 
have anything in the except: clause. Neither Mike's example nor your original 
one have any except: clause. Why do you think that we would interpret those 
words to mean that you wanted the example you give just above?

>>>>> 2) not even showing anything about your earlier statements, which were
>>>>> just incorrect.
>>>>>
>>>>> You're instead showing that my code works as it should for the case
>>>>> that
>>>>> you're testing, which is a bit unnecessary since I knew that, but
>>>>> thanks
>>>>> anyway.
>>>>
>>>> It's the case you seem to be talking about in your original post.
>>>
>>> What's this "seems"? Are you unable to read that very short post?
>>
>> I say "seems" because my understandings of what you meant in your
>> original post and your response to Mike disagreed with one another.
>> Now I see that your later posts were talking about minor discrepancy
>> about which errors you wanted caught by the finally: and which you
>> didn't.
>
> It's absolutely not a minor discrepancy whether some code is executed or
> not. It can have arbitrarily large effect. And from my point of view the
> discussion of that snippet has not been about what errors I "want"
> caught by the 'finally'; it's been about whether two snippets of code
> yield the same effect or not: Mike's code was incorrect not because it
> did something else, but because as code that did something else it was
> not an equivalent to the code that I posted.
>
>
>> I was confused because it seemed that you were saying that try:
>> finally: was completely wrong and that "try/else" was right. It
>> confused me and at least one other person.
>>
>>>> , but I do ask you to acknowledge that you originally were talking
>>>> about a feature that "ensure[s] some desired cleanup at the end of a
>>>> scope, even when the scope is exited via an exception."
>>>
>>> Yes, that's what it does.
>>>
>>> Which is I why I wrote that.
>>>
>>> This should not be hard to grok.
>>>
>>>
>>>> Do you acknowledge this?
>>>
>>> This seems like pure noise, to cover up that you were sputing a lot of
>>> incorrect statements earlier.
>>
>> No, I'm just trying to clarify what you are trying to say. The above
>> statement did not appear to accord with your later statement: 'if you
>> thought about it you would mean a simple "try/else". "finally" is
>> always executed. which is incorrect for cleanup.' It turns out that
>> what you really meant was that it would be incorrect for cleanup to be
>> executed when an error occurred in the chdir() itself.
>>
>> Now, I happen to disagree with that.
>
> Well, I was pretty unclear, almost hint-like, sorry about that, mea
> culpa, but you have it slightly wrong. You wrote then "The example you
> gave is definitely equivalent to the try: finally: that Mike posted."
> And it isn't.

I agree that it does behave differently with respect to when an exception is 
raised in chdir(). I was wrong on that point. I thought you were claiming that 
it behaved differently when there was an exception in the "# Do other stuff" 
block because you were being (and are still being) unclear.

>> There are a couple of ways to do this kind of cleanup depending on the
>> situation. Basically, you have several different code blocks:
>>
>> # 1. Record original state.
>> # 2. Modify state.
>> # 3. Do stuff requiring the modified state.
>> # 4. Revert to the original state.
>>
>> Depending on where errors are expected to occur, and how the state
>> needs to get modified and restored, there are different ways of
>> arranging these blocks. The one Mike showed:
>>
>> # 1. Record original state.
>> try:
>> # 2. Modify state.
>> # 3. Do stuff requiring the modified state.
>> finally:
>> # 4. Revert to the original state.
>>
>> And the one you prefer:
>>
>> # 1. Record original state.
>> # 2. Modify state.
>> try:
>> # 3. Do stuff requiring the modified state.
>> finally:
>> # 4. Revert to the original state.
>>
>> These differ in what happens when an error occurs in block #2, the
>> modification of the state. In Mike's, the cleanup code runs; in yours,
>> it doesn't. For chdir(), it really doesn't matter. Reverting to the
>> original state is harmless whether the original chdir() succeeds or
>> fails, and chdir() is essentially atomic so if it raises an exception,
>> the state did not change and nothing needs to be cleaned up.
>>
>> However, not all block #2s are atomic. Some are going to fail partway
>> through and need to be cleaned up even though they raised an
>> exception. Fortunately, cleanup can frequently be written to not care
>> whether the whole thing finished or not.
>
> Yeah, and there are some systematic ways to handle these things. You
> might look up Dave Abraham's levels of exception safety. Mostly his
> approach boils down to making operations effectively atomic so as to
> reduce the complexity: ideally, if an operation raises an exception,
> then it has undone any side effects.
>
> Of course it can't undo the launching of an ICBM, for example...
>
> But ideally, if it could, then it should.

I agree. Atomic operations like chdir() help a lot. But this is Python, and 
exceptions can happen in many different places. If you're not just calling an 
extension module function that makes a known-atomic system call, you run the 
risk of not having an atomic operation.

> If you call the possibly failing operation "A", then that systematic
> approach goes like this: if A fails, then it has cleaned up its own
> mess, but if A succeeds, then it's the responsibility of the calling
> code to clean up if the higher level (multiple statements) operation
> that A is embedded in, fails.
>
> And that's what Marginean's original C++ ScopeGuard was designed for,
> and what the corresponding Python Cleanup class is designed for.

And try: finally:, for that matter.

>> Both formulations can be correct (and both work perfectly fine with
>> the chdir() example being used). Sometimes one is better than the
>> other, and sometimes not. You can achieve both ways with either your
>> Cleanup class or with try: finally:.
>>
>> I am still of the opinion that Cleanup is not an improvement over try:
>> finally: and has the significant ugliness of forcing cleanup code into
>> callables. This significantly limits what you can do in your cleanup
>> code.
>
> Uhm, not really. :-) As I see it.

Well, not being able to affect the namespace is a significant limitation. 
Sometimes you need to delete objects from the namespace in order to ensure that 
their refcounts go to zero and their cleanup code gets executed. Tracebacks will 
keep the namespace alive and all objects in it.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From alfps at start.no  Thu Mar  4 10:48:41 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Thu, 04 Mar 2010 16:48:41 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.277.1267699818.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>
	<mailman.277.1267699818.23598.python-list@python.org>
Message-ID: <hmokot$uso$1@news.eternal-september.org>

* Jean-Michel Pichavant:
> Alf P. Steinbach wrote:
>>>  From your post, the scope guard technique is used "to ensure some 
>>> desired cleanup at the end of a scope, even when the scope is exited 
>>> via an exception." This is precisely what the try: finally: syntax is 
>>> for. 
>>
>> You'd have to nest it. That's ugly. And more importantly, now two 
>> people in this thread (namely you and Mike) have demonstrated that 
>> they do not grok the try functionality and manage to write incorrect 
>> code, even arguing that it's correct when informed that it's not, so 
>> it's a pretty fragile construct, like goto.
> 
> You want to execute some cleanup when things go wrong, use try except. 
> You want to do it when things go right, use try else. You want to 
> cleanup no matter what happen, use try finally.
> 
> There is no need of any Cleanup class, except for some technical 
> alternative  concern.

Have you considered that your argument applies to the "with" construct?

You have probably not realized that.

But let me force it on you: when would you use "with"?

Check if that case is covered by your argument above.

Now that you've been told about the "with" angle, don't you think it's a kind of 
weakness in your argument that it calls for removing "with" from the language?

I recommend that you think about why your argument is invalid.

Or, as I like to say, why your argument is completely bogus.


Cheers & hth.,

- Alf


From joe.hrbek at gmail.com  Thu Mar  4 10:57:18 2010
From: joe.hrbek at gmail.com (Sneaky Wombat)
Date: Thu, 4 Mar 2010 07:57:18 -0800 (PST)
Subject: loop over list and process into groups
Message-ID: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>

[ {'vlan_or_intf': 'VLAN2021'},
 {'vlan_or_intf': 'Interface'},
 {'vlan_or_intf': 'Po1'},
 {'vlan_or_intf': 'Po306'},
 {'vlan_or_intf': 'VLAN2022'},
 {'vlan_or_intf': 'Interface'},
 {'vlan_or_intf': 'Gi7/33'},
 {'vlan_or_intf': 'Po1'},
 {'vlan_or_intf': 'Po306'},
 {'vlan_or_intf': 'VLAN2051'},
 {'vlan_or_intf': 'Interface'},
 {'vlan_or_intf': 'Gi9/6'},
 {'vlan_or_intf': 'VLAN2052'},
 {'vlan_or_intf': 'Interface'},
 {'vlan_or_intf': 'Gi9/6'},]

I want it to be converted to:

[{'2021':['Po1','Po306']},{'2022':['Gi7/33','Po1','Po306']},etc etc]

I was going to write a def to loop through and look for certain pre-
compiled regexs, and then put them in a new dictionary and append to a
list, but I'm having trouble thinking of a good way to capture each
dictionary.  Each dictionary will have a key that is the vlan and the
value will be a list of interfaces that participate in that vlan.
Each list will be variable, many containing only one interface and
some containing many interfaces.

I thought about using itertools, but i only use that for fixed data.
I don't know of a good way to loop over variably sized data.  I was
wondering if anyone had any ideas about a good way to convert this
list or dictionary into the right format that I need.  The solution I
come up with will most likely be ugly and error prone, so I thought
i'd ask this python list while I work.  Hopefully I learn a better way
to solve this problem.

Thanks!

I also have the data in a list,

[ 'VLAN4065',
 'Interface',
 'Gi9/6',
 'Po2',
 'Po3',
 'Po306',
 'VLAN4068',
 'Interface',
 'Gi9/6',
 'VLAN4069',
 'Interface',
 'Gi9/6',]


From robert.kern at gmail.com  Thu Mar  4 11:04:02 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 04 Mar 2010 10:04:02 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <hmokot$uso$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>
	<hmokot$uso$1@news.eternal-september.org>
Message-ID: <hmolli$iii$1@dough.gmane.org>

On 2010-03-04 09:48 AM, Alf P. Steinbach wrote:
> * Jean-Michel Pichavant:
>> Alf P. Steinbach wrote:
>>>> From your post, the scope guard technique is used "to ensure some
>>>> desired cleanup at the end of a scope, even when the scope is exited
>>>> via an exception." This is precisely what the try: finally: syntax
>>>> is for.
>>>
>>> You'd have to nest it. That's ugly. And more importantly, now two
>>> people in this thread (namely you and Mike) have demonstrated that
>>> they do not grok the try functionality and manage to write incorrect
>>> code, even arguing that it's correct when informed that it's not, so
>>> it's a pretty fragile construct, like goto.
>>
>> You want to execute some cleanup when things go wrong, use try except.
>> You want to do it when things go right, use try else. You want to
>> cleanup no matter what happen, use try finally.
>>
>> There is no need of any Cleanup class, except for some technical
>> alternative concern.
>
> Have you considered that your argument applies to the "with" construct?
>
> You have probably not realized that.
>
> But let me force it on you: when would you use "with"?

When there is a specific context manager that removes the need for boilerplate.

> Check if that case is covered by your argument above.
>
> Now that you've been told about the "with" angle, don't you think it's a
> kind of weakness in your argument that it calls for removing "with" from
> the language?

No, it only argues that "with Cleanup():" is supernumerary.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From python at mrabarnett.plus.com  Thu Mar  4 11:14:01 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 04 Mar 2010 16:14:01 +0000
Subject: My four-yorkshireprogrammers contribution
In-Reply-To: <7v9e3rFl7mU1@mid.individual.net>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>	<4B8B9845.70604@sequans.com>	<mailman.59.1267456634.23598.python-list@python.org>	<7v695nFa0fU1@mid.individual.net>	<mailman.189.1267627321.23598.python-list@python.org>
	<7v9e3rFl7mU1@mid.individual.net>
Message-ID: <4B8FDC49.5070801@mrabarnett.plus.com>

Gregory Ewing wrote:
> MRAB wrote:
> 
>> Mk14 from Science of Cambridge, a kit with hex keypad and 7-segment
>> display, which I had to solder together, and also make my own power
>> supply. I had the extra RAM and the I/O chip, so that's 256B (including
>> the memory used by the monitor) + 256B additional RAM + 128B more in the
>> I/O chip.
> 
> Luxury! Mine was a Miniscamp, based on a design published in
> Electronics Australia in the 70s. 256 bytes RAM, 8 switches
> for input, 8 LEDs for output. No ROM -- program had to be
> toggled in each time.
> 
> Looked something like this:
> 
>   http://oldcomputermuseum.com/mini_scamp.html
> 
> except that mine wasn't built from a kit and didn't look
> quite as professional as that one.
> 
[snip]
By the standards of just a few years later, that's not so much a
microcomputer as a nanocomputer!

I was actually interested in electronics at the time, and it was such
things as Mk14 which lead me into computing.


From jeanmichel at sequans.com  Thu Mar  4 11:32:10 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Thu, 04 Mar 2010 17:32:10 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <hmokot$uso$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>
	<hmokot$uso$1@news.eternal-september.org>
Message-ID: <4B8FE08A.60005@sequans.com>

Alf P. Steinbach wrote:
> * Jean-Michel Pichavant:
>> Alf P. Steinbach wrote:
>>>>  From your post, the scope guard technique is used "to ensure some 
>>>> desired cleanup at the end of a scope, even when the scope is 
>>>> exited via an exception." This is precisely what the try: finally: 
>>>> syntax is for. 
>>>
>>> You'd have to nest it. That's ugly. And more importantly, now two 
>>> people in this thread (namely you and Mike) have demonstrated that 
>>> they do not grok the try functionality and manage to write incorrect 
>>> code, even arguing that it's correct when informed that it's not, so 
>>> it's a pretty fragile construct, like goto.
>>
>> You want to execute some cleanup when things go wrong, use try 
>> except. You want to do it when things go right, use try else. You 
>> want to cleanup no matter what happen, use try finally.
>>
>> There is no need of any Cleanup class, except for some technical 
>> alternative  concern.
>
> Have you considered that your argument applies to the "with" construct?
>
> You have probably not realized that.
>
> But let me force it on you: when would you use "with"?
>
> Check if that case is covered by your argument above.
>
> Now that you've been told about the "with" angle, don't you think it's 
> a kind of weakness in your argument that it calls for removing "with" 
> from the language?
>
> I recommend that you think about why your argument is invalid.
>
> Or, as I like to say, why your argument is completely bogus.
>
>
> Cheers & hth.,
>
> - Alf
I am using python 2.5, so I know nothing about the with statement, and 
it may possible my arguments apply to it, you could remove it from the 
language, it wouldn't bother me at all.
I just don't see in what you've written (adding a class, with some 
__entry__, __exit__ protocol, using a with statement) what cannot be 
achieved with a try statement in its simpliest form.

Try except may be lame and noobish, but it works, is easy to read and 
understood at first glance.
It looks like to me that 'with' statements are like decorators: 
overrated. Sometimes people could write simple readable code, but yet  
they're tempted by the geek side of programming: using complex 
constructs when there's no need to. I myself cannot resist sometimes ;-)

JM


From steve at holdenweb.com  Thu Mar  4 11:32:11 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 04 Mar 2010 11:32:11 -0500
Subject: How to login https sever with inputing account name and password?
In-Reply-To: <20100304103731.740AC40E@smtpcom.263xmail.com>
References: <20100304103731.740AC40E@smtpcom.263xmail.com>
Message-ID: <hmonae$q7s$1@dough.gmane.org>

Karen Wang wrote:
> Hi all,
> 
> I want to use python to access to https server, like
> ?https://212.218.229.10/chinatest/?
> 
> If open it from IE, will see the pop-up login windows like this
> 
> I tried several ways but always only get page for? HTTP Error 401.2 ?
> Unauthorized? error. ( myusername and mypassword are all correct)
> 
> Below is my code:
> 
> import urllib2
> 
> values = {
> 
>     'user' : "myusername",
> 
> ?pass' : "mypassword" }
> 
> data = urllib2.urlencode(values)
> 
> t = urllib2.urlopen('https://212.218.229.10/chinatest/',data)
> 
> print t.read()
> 
> where I am wrong ?
> 
Read the HTTP standard. The authentication data has to be send as HTTP
headers, not as the data to a POST request. The dialog box you see is
the browser attempting to collect the data it needs to put in the header.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From python at bdurham.com  Thu Mar  4 11:37:31 2010
From: python at bdurham.com (python at bdurham.com)
Date: Thu, 04 Mar 2010 11:37:31 -0500
Subject: My four-yorkshireprogrammers contribution
In-Reply-To: <4B8FDC49.5070801@mrabarnett.plus.com>
References: <20100224212303.242222c6@geekmail.INVALID>
	<eq4l57-okf2.ln1@ozzie.tundraware.com>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <7uu1ooFiipU1@mid.individual.net>
	<4B89D8BE.2040905@mrabarnett.plus.com> <4B8B9845.70604@sequans.com>
	<mailman.59.1267456634.23598.python-list@python.org>
	<7v695nFa0fU1@mid.individual.net>
	<mailman.189.1267627321.23598.python-list@python.org><7v9e3rFl7mU1@mid.individual.net>
	<4B8FDC49.5070801@mrabarnett.plus.com>
Message-ID: <1267720651.17005.1363119347@webmail.messagingengine.com>

Not to out do you guys, but over here in the states, I started out with
a Radio Shack 'computer' that consisted of 10 slideable switches and 10
flashlight bulbs. You ran wires betweens the slideable switches to
create 'programs'. Wish I could remember what this thing was called - my
google-fu fails me. This was approx 1976 when Popular Science's ELF-1
with 256 bytes was quite a sensation.

Cheers,
Malcolm


From magnicida at gmail.com  Thu Mar  4 11:51:21 2010
From: magnicida at gmail.com (Juan Pedro Bolivar Puente)
Date: Thu, 04 Mar 2010 18:51:21 +0200
Subject: NoSQL Movement?
In-Reply-To: <e0a86785-bb68-4977-8864-010ca4f71a6c@19g2000yqu.googlegroups.com>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<26bd4a5c-4d66-4597-a0ee-b4990f468e68@g26g2000yqn.googlegroups.com>
	<e0a86785-bb68-4977-8864-010ca4f71a6c@19g2000yqu.googlegroups.com>
Message-ID: <hmooea$uga$1@news.bytemine.net>

On 04/03/10 16:21, ccc31807 wrote:
> On Mar 3, 4:55 pm, toby <t... at telegraphics.com.au> wrote:
>>>  where you have to store data and
>>
>> "relational data"
> 
> Data is neither relational nor unrelational. Data is data.
> Relationships are an artifact, something we impose on the data.
> Relations are for human convenience, not something inherent in the
> data itself.
> 

No, relations are data. "Data is data" says nothing. Data is
information. Actually, all data are relations: relating /values/ to
/properties/ of /entities/. Relations as understood by the "relational
model" is nothing else but assuming that properties and entities are
first class values of the data system and the can also be related.

JP


From mrkafk at gmail.com  Thu Mar  4 11:55:10 2010
From: mrkafk at gmail.com (mk)
Date: Thu, 04 Mar 2010 17:55:10 +0100
Subject: loop over list and process into groups
In-Reply-To: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>
References: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>
Message-ID: <hmoole$1bv$1@dough.gmane.org>

Sneaky Wombat wrote:
> I was going to write a def to loop through and look for certain pre-
> compiled regexs, and then put them in a new dictionary and append to a
> list, 

regexes are overkill in this case I think.

> [ 'VLAN4065',
>  'Interface',
>  'Gi9/6',
>  'Po2',
>  'Po3',
>  'Po306',
>  'VLAN4068',
>  'Interface',
>  'Gi9/6',
>  'VLAN4069',
>  'Interface',
>  'Gi9/6',]

Why not construct an intermediate dictionary?

elems = [ 'VLAN4065',
  'Interface',
  'Gi9/6',
  'Po2',
  'Po3',
  'Po306',
  'VLAN4068',
  'Interface',
  'Gi9/6',
  'VLAN4069',
  'Interface',
  'Gi9/6',]

def makeintermdict(elems):
     vd = {}
     vlan = None
     for el in elems:
         if el.startswith('VLAN'):
             vlan = el.replace('VLAN','')
         elif el == 'Interface':
             vd[vlan] = []
         else:
             vd[vlan].append(el)
     return vd

def makelist(interm):
     finlist = []
     for k in interm.keys():
         finlist.append({k:interm[k]})
     return finlist

if __name__ == "__main__":
     intermediate = makeintermdict(elems)
     print intermediate
     finlist = makelist(intermediate)
     print 'final', finlist


{'4068': ['Gi9/6'], '4069': ['Gi9/6'], '4065': ['Gi9/6', 'Po2', 'Po3', 
'Po306']}
final [{'4068': ['Gi9/6']}, {'4069': ['Gi9/6']}, {'4065': ['Gi9/6', 
'Po2', 'Po3', 'Po306']}]

I hope this is not your homework. :-)

Regards,
mk



From alfps at start.no  Thu Mar  4 11:56:34 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Thu, 04 Mar 2010 17:56:34 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.292.1267717742.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>	<hmn03d$5r6$1@news.eternal-september.org>
	<mailman.292.1267717742.23598.python-list@python.org>
Message-ID: <hmooo6$pg0$1@news.eternal-september.org>

* Robert Kern:
> On 2010-03-03 18:49 PM, Alf P. Steinbach wrote:
>> * Robert Kern:
[snip]
>>>  can you
>>> understand why we might think that you were saying that try: finally:
>>> was wrong and that you were proposing that your code was equivalent to
>>> some try: except: else: suite?
>>
>> No, not really. His code didn't match the semantics. Changing 'finally'
>> to 'else' could make it equivalent.
> 
> Okay, please show me what you mean by "changing 'finally' to 'else'." I 
> think you are being hinty again. It's not helpful.  
[snip middle of this paragraph]
> Why do you think that we would interpret those words 
> to mean that you wanted the example you give just above?

There's an apparent discrepancy between your call for an example and your 
subsequent (in the same paragraph) reference to the example given.

But as to why I assumed that that example, or a similar correct one, would be 
implied, it's the only meaningful interpretation.

Adopting a meaningless interpretation when a meaningful exists is generally just 
adversarial, but in this case I was, as you pointed out, extremely unclear, and 
I'm sorry: I should have given such example up front. Will try to do so.


[snip]
> 
>>> There are a couple of ways to do this kind of cleanup depending on the
>>> situation. Basically, you have several different code blocks:
>>>
>>> # 1. Record original state.
>>> # 2. Modify state.
>>> # 3. Do stuff requiring the modified state.
>>> # 4. Revert to the original state.
>>>
>>> Depending on where errors are expected to occur, and how the state
>>> needs to get modified and restored, there are different ways of
>>> arranging these blocks. The one Mike showed:
>>>
>>> # 1. Record original state.
>>> try:
>>> # 2. Modify state.
>>> # 3. Do stuff requiring the modified state.
>>> finally:
>>> # 4. Revert to the original state.
>>>
>>> And the one you prefer:
>>>
>>> # 1. Record original state.
>>> # 2. Modify state.
>>> try:
>>> # 3. Do stuff requiring the modified state.
>>> finally:
>>> # 4. Revert to the original state.
>>>
>>> These differ in what happens when an error occurs in block #2, the
>>> modification of the state. In Mike's, the cleanup code runs; in yours,
>>> it doesn't. For chdir(), it really doesn't matter. Reverting to the
>>> original state is harmless whether the original chdir() succeeds or
>>> fails, and chdir() is essentially atomic so if it raises an exception,
>>> the state did not change and nothing needs to be cleaned up.
>>>
>>> However, not all block #2s are atomic. Some are going to fail partway
>>> through and need to be cleaned up even though they raised an
>>> exception. Fortunately, cleanup can frequently be written to not care
>>> whether the whole thing finished or not.
>>
>> Yeah, and there are some systematic ways to handle these things. You
>> might look up Dave Abraham's levels of exception safety. Mostly his
>> approach boils down to making operations effectively atomic so as to
>> reduce the complexity: ideally, if an operation raises an exception,
>> then it has undone any side effects.
>>
>> Of course it can't undo the launching of an ICBM, for example...
>>
>> But ideally, if it could, then it should.
> 
> I agree. Atomic operations like chdir() help a lot. But this is Python, 
> and exceptions can happen in many different places. If you're not just 
> calling an extension module function that makes a known-atomic system 
> call, you run the risk of not having an atomic operation.
> 
>> If you call the possibly failing operation "A", then that systematic
>> approach goes like this: if A fails, then it has cleaned up its own
>> mess, but if A succeeds, then it's the responsibility of the calling
>> code to clean up if the higher level (multiple statements) operation
>> that A is embedded in, fails.
>>
>> And that's what Marginean's original C++ ScopeGuard was designed for,
>> and what the corresponding Python Cleanup class is designed for.
> 
> And try: finally:, for that matter.

Not to mention "with".

Some other poster made the same error recently in this thread; it is a common 
fallacy in discussions about programming, to assume that since the same can be 
expressed using lower level constructs, those are all that are required.

If adopted as true it ultimately means the removal of all control structures 
above the level of "if" and "goto" (except Python doesn't have "goto").


>>> Both formulations can be correct (and both work perfectly fine with
>>> the chdir() example being used). Sometimes one is better than the
>>> other, and sometimes not. You can achieve both ways with either your
>>> Cleanup class or with try: finally:.
>>>
>>> I am still of the opinion that Cleanup is not an improvement over try:
>>> finally: and has the significant ugliness of forcing cleanup code into
>>> callables. This significantly limits what you can do in your cleanup
>>> code.
>>
>> Uhm, not really. :-) As I see it.
> 
> Well, not being able to affect the namespace is a significant 
> limitation. Sometimes you need to delete objects from the namespace in 
> order to ensure that their refcounts go to zero and their cleanup code 
> gets executed.

Just a nit (I agree that a lambda can't do this, but as to what's required): 
assigning None is sufficient for that[1].

However, note that the current language doesn't guarantee such cleanup, at least 
as far as I know.

So while it's good practice to support it, to do everything to let it happen, 
it's presumably bad practice to rely on it happening.


> Tracebacks will keep the namespace alive and all objects 
> in it.

Thanks!, I hadn't thought of connecting that to general cleanup actions.

It limits the use of general "with" in the same way.


Cheers,

- Alf

Notes:
[1] An 'except' clause deletes variables, but since it has no knowledge of the 
code it's placed in the only alternatives would be a presumably costly check of 
prior existence, or letting it pollute the namespace.


From robert.kern at gmail.com  Thu Mar  4 12:00:32 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 04 Mar 2010 11:00:32 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <4B8FE08A.60005@sequans.com>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>	<hmokot$uso$1@news.eternal-september.org>
	<4B8FE08A.60005@sequans.com>
Message-ID: <hmoovi$322$1@dough.gmane.org>

On 2010-03-04 10:32 AM, Jean-Michel Pichavant wrote:
> Alf P. Steinbach wrote:
>> * Jean-Michel Pichavant:
>>> Alf P. Steinbach wrote:
>>>>> From your post, the scope guard technique is used "to ensure some
>>>>> desired cleanup at the end of a scope, even when the scope is
>>>>> exited via an exception." This is precisely what the try: finally:
>>>>> syntax is for.
>>>>
>>>> You'd have to nest it. That's ugly. And more importantly, now two
>>>> people in this thread (namely you and Mike) have demonstrated that
>>>> they do not grok the try functionality and manage to write incorrect
>>>> code, even arguing that it's correct when informed that it's not, so
>>>> it's a pretty fragile construct, like goto.
>>>
>>> You want to execute some cleanup when things go wrong, use try
>>> except. You want to do it when things go right, use try else. You
>>> want to cleanup no matter what happen, use try finally.
>>>
>>> There is no need of any Cleanup class, except for some technical
>>> alternative concern.
>>
>> Have you considered that your argument applies to the "with" construct?
>>
>> You have probably not realized that.
>>
>> But let me force it on you: when would you use "with"?
>>
>> Check if that case is covered by your argument above.
>>
>> Now that you've been told about the "with" angle, don't you think it's
>> a kind of weakness in your argument that it calls for removing "with"
>> from the language?
>>
>> I recommend that you think about why your argument is invalid.
>>
>> Or, as I like to say, why your argument is completely bogus.
>>
>>
>> Cheers & hth.,
>>
>> - Alf
> I am using python 2.5, so I know nothing about the with statement,

You can try it out using "from __future__ import with_statement".

> and
> it may possible my arguments apply to it, you could remove it from the
> language, it wouldn't bother me at all.
> I just don't see in what you've written (adding a class, with some
> __entry__, __exit__ protocol, using a with statement) what cannot be
> achieved with a try statement in its simpliest form.
>
> Try except may be lame and noobish, but it works, is easy to read and
> understood at first glance.
> It looks like to me that 'with' statements are like decorators:
> overrated. Sometimes people could write simple readable code, but yet
> they're tempted by the geek side of programming: using complex
> constructs when there's no need to. I myself cannot resist sometimes ;-)

PEP 343 is a good introduction to the real uses of the with: statement.

   http://www.python.org/dev/peps/pep-0343/

Basically, it allows you to package up your initialization and cleanup code into 
objects, stick them in your library, unit test them thoroughly, etc. so you 
don't have to repeat them everywhere and possibly get them wrong. It's DRY in 
action.

Where Alf's Cleanup class goes wrong, in my opinion, is that it does not package 
up any code to avoid repetition. You still repeat the same cleanup code 
everywhere you use it, so it is no better than try: finally:. It is not a real 
use case of the with: statement.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From alfps at start.no  Thu Mar  4 12:02:23 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Thu, 04 Mar 2010 18:02:23 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.293.1267718664.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>	<hmokot$uso$1@news.eternal-september.org>
	<mailman.293.1267718664.23598.python-list@python.org>
Message-ID: <hmop33$rrj$1@news.eternal-september.org>

* Robert Kern:
> On 2010-03-04 09:48 AM, Alf P. Steinbach wrote:
>> * Jean-Michel Pichavant:
>>> Alf P. Steinbach wrote:
>>>>> From your post, the scope guard technique is used "to ensure some
>>>>> desired cleanup at the end of a scope, even when the scope is exited
>>>>> via an exception." This is precisely what the try: finally: syntax
>>>>> is for.
>>>>
>>>> You'd have to nest it. That's ugly. And more importantly, now two
>>>> people in this thread (namely you and Mike) have demonstrated that
>>>> they do not grok the try functionality and manage to write incorrect
>>>> code, even arguing that it's correct when informed that it's not, so
>>>> it's a pretty fragile construct, like goto.
>>>
>>> You want to execute some cleanup when things go wrong, use try except.
>>> You want to do it when things go right, use try else. You want to
>>> cleanup no matter what happen, use try finally.
>>>
>>> There is no need of any Cleanup class, except for some technical
>>> alternative concern.
>>
>> Have you considered that your argument applies to the "with" construct?
>>
>> You have probably not realized that.
>>
>> But let me force it on you: when would you use "with"?
> 
> When there is a specific context manager that removes the need for 
> boilerplate.

That's "cleanup no matter what happen".


>> Check if that case is covered by your argument above.
>>
>> Now that you've been told about the "with" angle, don't you think it's a
>> kind of weakness in your argument that it calls for removing "with" from
>> the language?
> 
> No, it only argues that "with Cleanup():" is supernumerary.

I don't know what "supernumerary" means, but to the degree that the argument 
says anything about a construct that is not 'finally', it says the same about 
general "with".

So whatever you mean by supernumerary, you're saying that the argument implies 
that "with" is supernumerary.

This is starting to look like some earlier discussions in this group, where even 
basic logic is denied.


Cheers,

- Alf


From robert.kern at gmail.com  Thu Mar  4 12:20:20 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 04 Mar 2010 11:20:20 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <hmooo6$pg0$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>	<hmn03d$5r6$1@news.eternal-september.org>	<mailman.292.1267717742.23598.python-list@python.org>
	<hmooo6$pg0$1@news.eternal-september.org>
Message-ID: <hmoq4m$8e5$1@dough.gmane.org>

On 2010-03-04 10:56 AM, Alf P. Steinbach wrote:
> * Robert Kern:
>> On 2010-03-03 18:49 PM, Alf P. Steinbach wrote:
>>> * Robert Kern:
> [snip]
>>>> can you
>>>> understand why we might think that you were saying that try: finally:
>>>> was wrong and that you were proposing that your code was equivalent to
>>>> some try: except: else: suite?
>>>
>>> No, not really. His code didn't match the semantics. Changing 'finally'
>>> to 'else' could make it equivalent.
>>
>> Okay, please show me what you mean by "changing 'finally' to 'else'."
>> I think you are being hinty again. It's not helpful.
> [snip middle of this paragraph]
>> Why do you think that we would interpret those words to mean that you
>> wanted the example you give just above?
>
> There's an apparent discrepancy between your call for an example and
> your subsequent (in the same paragraph) reference to the example given.
>
> But as to why I assumed that that example, or a similar correct one,
> would be implied, it's the only meaningful interpretation.
>
> Adopting a meaningless interpretation when a meaningful exists is
> generally just adversarial, but in this case I was, as you pointed out,
> extremely unclear, and I'm sorry: I should have given such example up
> front. Will try to do so.

Thank you. I appreciate it.

> [snip]
>>
>>>> There are a couple of ways to do this kind of cleanup depending on the
>>>> situation. Basically, you have several different code blocks:
>>>>
>>>> # 1. Record original state.
>>>> # 2. Modify state.
>>>> # 3. Do stuff requiring the modified state.
>>>> # 4. Revert to the original state.
>>>>
>>>> Depending on where errors are expected to occur, and how the state
>>>> needs to get modified and restored, there are different ways of
>>>> arranging these blocks. The one Mike showed:
>>>>
>>>> # 1. Record original state.
>>>> try:
>>>> # 2. Modify state.
>>>> # 3. Do stuff requiring the modified state.
>>>> finally:
>>>> # 4. Revert to the original state.
>>>>
>>>> And the one you prefer:
>>>>
>>>> # 1. Record original state.
>>>> # 2. Modify state.
>>>> try:
>>>> # 3. Do stuff requiring the modified state.
>>>> finally:
>>>> # 4. Revert to the original state.
>>>>
>>>> These differ in what happens when an error occurs in block #2, the
>>>> modification of the state. In Mike's, the cleanup code runs; in yours,
>>>> it doesn't. For chdir(), it really doesn't matter. Reverting to the
>>>> original state is harmless whether the original chdir() succeeds or
>>>> fails, and chdir() is essentially atomic so if it raises an exception,
>>>> the state did not change and nothing needs to be cleaned up.
>>>>
>>>> However, not all block #2s are atomic. Some are going to fail partway
>>>> through and need to be cleaned up even though they raised an
>>>> exception. Fortunately, cleanup can frequently be written to not care
>>>> whether the whole thing finished or not.
>>>
>>> Yeah, and there are some systematic ways to handle these things. You
>>> might look up Dave Abraham's levels of exception safety. Mostly his
>>> approach boils down to making operations effectively atomic so as to
>>> reduce the complexity: ideally, if an operation raises an exception,
>>> then it has undone any side effects.
>>>
>>> Of course it can't undo the launching of an ICBM, for example...
>>>
>>> But ideally, if it could, then it should.
>>
>> I agree. Atomic operations like chdir() help a lot. But this is
>> Python, and exceptions can happen in many different places. If you're
>> not just calling an extension module function that makes a
>> known-atomic system call, you run the risk of not having an atomic
>> operation.
>>
>>> If you call the possibly failing operation "A", then that systematic
>>> approach goes like this: if A fails, then it has cleaned up its own
>>> mess, but if A succeeds, then it's the responsibility of the calling
>>> code to clean up if the higher level (multiple statements) operation
>>> that A is embedded in, fails.
>>>
>>> And that's what Marginean's original C++ ScopeGuard was designed for,
>>> and what the corresponding Python Cleanup class is designed for.
>>
>> And try: finally:, for that matter.
>
> Not to mention "with".
>
> Some other poster made the same error recently in this thread; it is a
> common fallacy in discussions about programming, to assume that since
> the same can be expressed using lower level constructs, those are all
> that are required.
>
> If adopted as true it ultimately means the removal of all control
> structures above the level of "if" and "goto" (except Python doesn't
> have "goto").

What I'm trying to explain is that the with: statement has a use even if Cleanup 
doesn't. Arguing that Cleanup doesn't improve on try: finally: does not mean 
that the with: statement doesn't improve on try: finally:.

>>>> Both formulations can be correct (and both work perfectly fine with
>>>> the chdir() example being used). Sometimes one is better than the
>>>> other, and sometimes not. You can achieve both ways with either your
>>>> Cleanup class or with try: finally:.
>>>>
>>>> I am still of the opinion that Cleanup is not an improvement over try:
>>>> finally: and has the significant ugliness of forcing cleanup code into
>>>> callables. This significantly limits what you can do in your cleanup
>>>> code.
>>>
>>> Uhm, not really. :-) As I see it.
>>
>> Well, not being able to affect the namespace is a significant
>> limitation. Sometimes you need to delete objects from the namespace in
>> order to ensure that their refcounts go to zero and their cleanup code
>> gets executed.
>
> Just a nit (I agree that a lambda can't do this, but as to what's
> required): assigning None is sufficient for that[1].

Yes, but no callable is going to allow you to assign None to names in that 
namespace, either. Not without sys._getframe() hackery, in any case.

> However, note that the current language doesn't guarantee such cleanup,
> at least as far as I know.
>
> So while it's good practice to support it, to do everything to let it
> happen, it's presumably bad practice to rely on it happening.
>
>
>> Tracebacks will keep the namespace alive and all objects in it.
>
> Thanks!, I hadn't thought of connecting that to general cleanup actions.
>
> It limits the use of general "with" in the same way.

Not really. It's easy to write context managers that do that. You put the 
initialization code in the __enter__() method, assign whatever objects you want 
to keep around through the with: clause as attributes on the manager, then 
delete those attributes in the __exit__(). Or, you use the @contextmanager 
decorator to turn a generator into a context manager, and you just assign to 
local variables and del them in the finally: clause.

What you can't do is write a generic context manager where the initialization 
happens inside the with: clause and the cleanup actions are registered 
callables. That does not allow you to affect the namespace.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From lbolla at gmail.com  Thu Mar  4 12:29:46 2010
From: lbolla at gmail.com (lbolla)
Date: Thu, 4 Mar 2010 09:29:46 -0800 (PST)
Subject: memory usage, temporary and otherwise
References: <mailman.220.1267642060.23598.python-list@python.org> 
	<Xns9D317E4A4CAD5duncanbooth@127.0.0.1>
Message-ID: <41c42ec5-1939-48f8-84e3-b8748161b524@g28g2000yqh.googlegroups.com>

On Mar 4, 12:24?pm, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
>
> ?>>> a={}
> ?>>> for i in range(10000000):
> ... ? ? a[i]=intern('spam'*10)
>

"intern": another name borrowed from Lisp?


From robert.kern at gmail.com  Thu Mar  4 12:30:03 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 04 Mar 2010 11:30:03 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <hmop33$rrj$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>	<hmokot$uso$1@news.eternal-september.org>	<mailman.293.1267718664.23598.python-list@python.org>
	<hmop33$rrj$1@news.eternal-september.org>
Message-ID: <hmoqmr$akt$1@dough.gmane.org>

On 2010-03-04 11:02 AM, Alf P. Steinbach wrote:
> * Robert Kern:
>> On 2010-03-04 09:48 AM, Alf P. Steinbach wrote:
>>> * Jean-Michel Pichavant:
>>>> Alf P. Steinbach wrote:
>>>>>> From your post, the scope guard technique is used "to ensure some
>>>>>> desired cleanup at the end of a scope, even when the scope is exited
>>>>>> via an exception." This is precisely what the try: finally: syntax
>>>>>> is for.
>>>>>
>>>>> You'd have to nest it. That's ugly. And more importantly, now two
>>>>> people in this thread (namely you and Mike) have demonstrated that
>>>>> they do not grok the try functionality and manage to write incorrect
>>>>> code, even arguing that it's correct when informed that it's not, so
>>>>> it's a pretty fragile construct, like goto.
>>>>
>>>> You want to execute some cleanup when things go wrong, use try except.
>>>> You want to do it when things go right, use try else. You want to
>>>> cleanup no matter what happen, use try finally.
>>>>
>>>> There is no need of any Cleanup class, except for some technical
>>>> alternative concern.
>>>
>>> Have you considered that your argument applies to the "with" construct?
>>>
>>> You have probably not realized that.
>>>
>>> But let me force it on you: when would you use "with"?
>>
>> When there is a specific context manager that removes the need for
>> boilerplate.
>
> That's "cleanup no matter what happen".

For the "# Do stuff" block, yes. For the initialization block, you can write a 
context manager to do it either way, as necessary.

>>> Check if that case is covered by your argument above.
>>>
>>> Now that you've been told about the "with" angle, don't you think it's a
>>> kind of weakness in your argument that it calls for removing "with" from
>>> the language?
>>
>> No, it only argues that "with Cleanup():" is supernumerary.
>
> I don't know what "supernumerary" means,

http://www.merriam-webster.com/dictionary/supernumerary

> but to the degree that the
> argument says anything about a construct that is not 'finally', it says
> the same about general "with".

He's ignorant of the use cases of the with: statement, true. Given only your 
example of the with: statement, it is hard to fault him for thinking that try: 
finally: wouldn't suffice.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From joe.hrbek at gmail.com  Thu Mar  4 12:41:45 2010
From: joe.hrbek at gmail.com (Sneaky Wombat)
Date: Thu, 4 Mar 2010 09:41:45 -0800 (PST)
Subject: loop over list and process into groups
References: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>
	<mailman.298.1267721732.23598.python-list@python.org>
Message-ID: <f060c85b-ff10-4d19-a7f7-6abf26ce371e@t23g2000yqt.googlegroups.com>

On Mar 4, 10:55?am, mk <mrk... at gmail.com> wrote:
> Sneaky Wombat wrote:
> > I was going to write a def to loop through and look for certain pre-
> > compiled regexs, and then put them in a new dictionary and append to a
> > list,
>
> regexes are overkill in this case I think.
>
> > [ 'VLAN4065',
> > ?'Interface',
> > ?'Gi9/6',
> > ?'Po2',
> > ?'Po3',
> > ?'Po306',
> > ?'VLAN4068',
> > ?'Interface',
> > ?'Gi9/6',
> > ?'VLAN4069',
> > ?'Interface',
> > ?'Gi9/6',]
>
> Why not construct an intermediate dictionary?
>
> elems = [ 'VLAN4065',
> ? 'Interface',
> ? 'Gi9/6',
> ? 'Po2',
> ? 'Po3',
> ? 'Po306',
> ? 'VLAN4068',
> ? 'Interface',
> ? 'Gi9/6',
> ? 'VLAN4069',
> ? 'Interface',
> ? 'Gi9/6',]
>
> def makeintermdict(elems):
> ? ? ?vd = {}
> ? ? ?vlan = None
> ? ? ?for el in elems:
> ? ? ? ? ?if el.startswith('VLAN'):
> ? ? ? ? ? ? ?vlan = el.replace('VLAN','')
> ? ? ? ? ?elif el == 'Interface':
> ? ? ? ? ? ? ?vd[vlan] = []
> ? ? ? ? ?else:
> ? ? ? ? ? ? ?vd[vlan].append(el)
> ? ? ?return vd
>
> def makelist(interm):
> ? ? ?finlist = []
> ? ? ?for k in interm.keys():
> ? ? ? ? ?finlist.append({k:interm[k]})
> ? ? ?return finlist
>
> if __name__ == "__main__":
> ? ? ?intermediate = makeintermdict(elems)
> ? ? ?print intermediate
> ? ? ?finlist = makelist(intermediate)
> ? ? ?print 'final', finlist
>
> {'4068': ['Gi9/6'], '4069': ['Gi9/6'], '4065': ['Gi9/6', 'Po2', 'Po3',
> 'Po306']}
> final [{'4068': ['Gi9/6']}, {'4069': ['Gi9/6']}, {'4065': ['Gi9/6',
> 'Po2', 'Po3', 'Po306']}]
>
> I hope this is not your homework. :-)
>
> Regards,
> mk

Thanks mk,

My approach was a lot more complex than yours, but your's is better.
I like itertools and was using islice to create tuples for (start,end)
string slicing.  Too much work though.  Thanks!

-j


From gneuner2 at comcast.net  Thu Mar  4 12:44:23 2010
From: gneuner2 at comcast.net (George Neuner)
Date: Thu, 04 Mar 2010 12:44:23 -0500
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<26bd4a5c-4d66-4597-a0ee-b4990f468e68@g26g2000yqn.googlegroups.com>
	<e0a86785-bb68-4977-8864-010ca4f71a6c@19g2000yqu.googlegroups.com>
	<hmooea$uga$1@news.bytemine.net>
Message-ID: <6iqvo5hvlnpci5oi5rgs1ohpj085s12o6n@4ax.com>

On Thu, 04 Mar 2010 18:51:21 +0200, Juan Pedro Bolivar Puente
<magnicida at gmail.com> wrote:

>On 04/03/10 16:21, ccc31807 wrote:
>> On Mar 3, 4:55 pm, toby <t... at telegraphics.com.au> wrote:
>>>>  where you have to store data and
>>>
>>> "relational data"
>> 
>> Data is neither relational nor unrelational. Data is data.
>> Relationships are an artifact, something we impose on the data.
>> Relations are for human convenience, not something inherent in the
>> data itself.
>> 
>
>No, relations are data. "Data is data" says nothing. Data is
>information. Actually, all data are relations: relating /values/ to
>/properties/ of /entities/. Relations as understood by the "relational
>model" is nothing else but assuming that properties and entities are
>first class values of the data system and the can also be related.

Well ... sort of.  Information is not data but rather the
understanding of something represented by the data.  The term
"information overload" is counter-intuitive ... it really means an
excess of data for which there is little understanding.

Similarly, at the level to which you are referring, a relation is not
data but simply a theoretical construct.  At this level testable
properties or instances of the relation are data, but the relation
itself is not.  The relation may be data at a higher level.

George


From spamfresser at ch3ka.de  Thu Mar  4 12:50:32 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Thu, 04 Mar 2010 18:50:32 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.300.1267723245.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>	<hmn03d$5r6$1@news.eternal-september.org>	<mailman.292.1267717742.23598.python-list@python.org>	<hmooo6$pg0$1@news.eternal-september.org>
	<mailman.300.1267723245.23598.python-list@python.org>
Message-ID: <hmortf$fbj$1@news.urz.uni-heidelberg.de>

Am 04.03.2010 18:20, schrieb Robert Kern:
>
> What I'm trying to explain is that the with: statement has a use even if
> Cleanup doesn't. Arguing that Cleanup doesn't improve on try: finally:
> does not mean that the with: statement doesn't improve on try: finally:.

Yes, the with-statement rocks :)

I suggested such a thing a few days ago in another thread, where OP 
wanted a "silent" keyword like:

silent:
	do_stuff()

would be equivalent to:
try: do_stuff() except: pass

Of course catching *all* exceptions was a bad idea, so I came up with 
the code below and now I actually like it and use it myself :)

---------snip---------
To your first question about a "silenced" keyword: you could emulate 
this with context managers I guess.

Something like (untested, just a quick mockup how it could look):



class silenced:
     def __init__(self, *silenced):
         self.exceptions=tuple(silenced) #just to be explicit
     def __enter__(self):
         return self            #dito
     def __exit__(self, type, value, traceback):
         for ex in self.exceptions:
             if isinstance(value, ex):
                 return True #supresses exception


So:

with silenced(os.Error):
     os.remove(somefile)

Would translate to:

try:
     os.remove(somefile)
except os.Error:
     pass

One nice thing about this approach would be that you can alias a set of 
exceptions with this:

idontcareabouttheseerrors=silenced(TypeError, ValueError, PEBCAKError, 
SyntaxError, EndOfWorldError, 1D10T_Error)

with idontcareabouttheseerrors:
     do_stuff()

Regards,
Michael


From cartercc at gmail.com  Thu Mar  4 12:52:06 2010
From: cartercc at gmail.com (ccc31807)
Date: Thu, 4 Mar 2010 09:52:06 -0800 (PST)
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com> 
	<26bd4a5c-4d66-4597-a0ee-b4990f468e68@g26g2000yqn.googlegroups.com> 
	<e0a86785-bb68-4977-8864-010ca4f71a6c@19g2000yqu.googlegroups.com> 
	<hmooea$uga$1@news.bytemine.net>
Message-ID: <7bfeffcd-722e-4df4-8455-7710207d9c7e@a18g2000yqc.googlegroups.com>

On Mar 4, 11:51?am, Juan Pedro Bolivar Puente <magnic... at gmail.com>
wrote:
> No, relations are data.

This depends on your definition of 'data.' I would say that
relationships is information gleaned from the data.

> "Data is data" says nothing. Data is
> information.

To me, data and information are not the same thing, and in particular,
data is NOT information. To me, information consists of the sifting,
sorting, filtering, and rearrangement of data that can be useful in
completing some task. As an illustration, consider some very large
collection of ones and zeros -- the information it contains depends on
whether it's views as a JPEG, an EXE, XML, WAV, or other sort of
information processing device. Whichever way it's processed, the
'data' (the ones and zeros) stay the same, and do not constitute
'information' in their raw state.

> Actually, all data are relations: relating /values/ to
> /properties/ of /entities/. Relations as understood by the "relational
> model" is nothing else but assuming that properties and entities are
> first class values of the data system and the can also be related.

Well, this sort of illustrates my point. The 'values' of 'properties'
relating to specific 'entities' depends on how one processes the data,
which can be processed various ways. For example, 10000001 can either
be viewed as the decimal number 65 or the alpha character 'A' but the
decision as to how to view this value isn't inherent in the data
itself, but only as an artifact of our use of the data to turn it into
information.

CC.


From spamfresser at ch3ka.de  Thu Mar  4 12:55:18 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Thu, 04 Mar 2010 18:55:18 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.295.1267720340.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>	<hmokot$uso$1@news.eternal-september.org>
	<mailman.295.1267720340.23598.python-list@python.org>
Message-ID: <hmos6c$fca$1@news.urz.uni-heidelberg.de>

Am 04.03.2010 17:32, schrieb Jean-Michel Pichavant:
> It looks like to me that 'with' statements are like decorators: overrated.

Oh no, you just insulted my favourite two python features, followed 
immediately by generators, iterators and list comprehensions / generator 
expressions :p

No, really: they *are* great ;D

Regards,
Michael


From gnewsg at gmail.com  Thu Mar  4 12:57:40 2010
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Thu, 4 Mar 2010 09:57:40 -0800 (PST)
Subject: ANN: psutil 0.1.3 released
Message-ID: <39a8f505-2caa-4592-a359-9731e20002eb@y17g2000yqd.googlegroups.com>

Hi,
I'm pleased to announce the 0.1.3 release of psutil:
http://code.google.com/p/psutil

=== About ===

psutil is a module providing an interface for retrieving information
on running processes and system utilization (CPU, memory) in a
portable way by using Python, implementing many functionalities
offered by tools like ps, top and Windows task manager.

It currently supports Linux, OS X, FreeBSD and Windows with Python
versions from 2.4 to 3.1 by using a unique code base.

=== Major enhancements ===

 * Python 3 support
 * per-process username
 * suspend / resume process
 * per-process current working directory (Windows and Linux only)
 * added support for Windows 7 and FreeBSD 64 bit

=== Links ===

* Home page: http://code.google.com/p/psutil
* Mailing list: http://groups.google.com/group/psutil/topics
* Source tarball: http://psutil.googlecode.com/files/psutil-0.1.3.tar.gz
* OS X installer: http://psutil.googlecode.com/files/psutil-0.1.3-py2.6-macosx10.4.dmg
* Windows Installer (Python 2.6): http://psutil.googlecode.com/files/psutil-0.1.3.win32-py2.6.exe
* Windows Installer (Python 3.1): http://psutil.googlecode.com/files/psutil-0.1.3.win32-py3.1.exe
* Api Reference: http://code.google.com/p/psutil/wiki/Documentation


Thanks

--- Giampaolo Rodola'
http://code.google.com/p/pyftpdlib
http://code.google.com/p/psutil/


From lbolla at gmail.com  Thu Mar  4 12:59:21 2010
From: lbolla at gmail.com (lbolla)
Date: Thu, 4 Mar 2010 09:59:21 -0800 (PST)
Subject: loop over list and process into groups
References: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>
Message-ID: <5e9126f7-f9e2-4c38-8dd5-dc174204fd71@d27g2000yqf.googlegroups.com>

On Mar 4, 3:57?pm, Sneaky Wombat <joe.hr... at gmail.com> wrote:
> [ {'vlan_or_intf': 'VLAN2021'},
> ?{'vlan_or_intf': 'Interface'},
> ?{'vlan_or_intf': 'Po1'},
> ?{'vlan_or_intf': 'Po306'},
> ?{'vlan_or_intf': 'VLAN2022'},
> ?{'vlan_or_intf': 'Interface'},
> ?{'vlan_or_intf': 'Gi7/33'},
> ?{'vlan_or_intf': 'Po1'},
> ?{'vlan_or_intf': 'Po306'},
> ?{'vlan_or_intf': 'VLAN2051'},
> ?{'vlan_or_intf': 'Interface'},
> ?{'vlan_or_intf': 'Gi9/6'},
> ?{'vlan_or_intf': 'VLAN2052'},
> ?{'vlan_or_intf': 'Interface'},
> ?{'vlan_or_intf': 'Gi9/6'},]
>
> I want it to be converted to:
>
> [{'2021':['Po1','Po306']},{'2022':['Gi7/33','Po1','Po306']},etc etc]
>
> I was going to write a def to loop through and look for certain pre-
> compiled regexs, and then put them in a new dictionary and append to a
> list, but I'm having trouble thinking of a good way to capture each
> dictionary. ?Each dictionary will have a key that is the vlan and the
> value will be a list of interfaces that participate in that vlan.
> Each list will be variable, many containing only one interface and
> some containing many interfaces.
>
> I thought about using itertools, but i only use that for fixed data.
> I don't know of a good way to loop over variably sized data. ?I was
> wondering if anyone had any ideas about a good way to convert this
> list or dictionary into the right format that I need. ?The solution I
> come up with will most likely be ugly and error prone, so I thought
> i'd ask this python list while I work. ?Hopefully I learn a better way
> to solve this problem.
>
> Thanks!
>
> I also have the data in a list,
>
> [ 'VLAN4065',
> ?'Interface',
> ?'Gi9/6',
> ?'Po2',
> ?'Po3',
> ?'Po306',
> ?'VLAN4068',
> ?'Interface',
> ?'Gi9/6',
> ?'VLAN4069',
> ?'Interface',
> ?'Gi9/6',]



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

from itertools import groupby

data = \
[ {'vlan_or_intf': 'VLAN2021'},
 {'vlan_or_intf': 'Interface'},
 {'vlan_or_intf': 'Po1'},
 {'vlan_or_intf': 'Po306'},
 {'vlan_or_intf': 'VLAN2022'},
 {'vlan_or_intf': 'Interface'},
 {'vlan_or_intf': 'Gi7/33'},
 {'vlan_or_intf': 'Po1'},
 {'vlan_or_intf': 'Po306'},
 {'vlan_or_intf': 'VLAN2051'},
 {'vlan_or_intf': 'Interface'},
 {'vlan_or_intf': 'Gi9/6'},
 {'vlan_or_intf': 'VLAN2052'},
 {'vlan_or_intf': 'Interface'},
 {'vlan_or_intf': 'Gi9/6'},]

def clean_up(lst):
	return [d.values()[0] for d in data if d.values()[0] != 'Interface']

out = {}
for k, g in groupby(clean_up(data) , key=lambda s:
s.startswith('VLAN')):
	if k:
		key = list(g)[0].replace('VLAN','')
	else:
		out[key] = list(g)

print out
===================================

hth,
L.


From tjreedy at udel.edu  Thu Mar  4 13:03:29 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 04 Mar 2010 13:03:29 -0500
Subject: memory usage, temporary and otherwise
In-Reply-To: <hmo751$plh$1@dough.gmane.org>
References: <mailman.220.1267642060.23598.python-list@python.org>	<4b8ee61a$0$26644$426a74cc@news.free.fr>
	<hmo751$plh$1@dough.gmane.org>
Message-ID: <hmoslf$h3b$1@dough.gmane.org>

On 3/4/2010 6:56 AM, mk wrote:
> Bruno Desthuilliers wrote:

> Huh? I was under impression that some time after 2.0 range was made to
> work "under the covers" like xrange when used in a loop? Or is it 3.0
> that does that?

3.0.




From john at castleamber.com  Thu Mar  4 13:06:15 2010
From: john at castleamber.com (John Bokma)
Date: Thu, 04 Mar 2010 12:06:15 -0600
Subject: Working group for Python CPAN-equivalence?
References: <mailman.179.1267620332.23598.python-list@python.org>
	<87r5o1v8vp.fsf@benfinney.id.au>
	<4b8e929d$0$1585$742ec2ed@news.sonic.net>
	<mailman.239.1267650035.23598.python-list@python.org>
	<87eik1ujg4.fsf@benfinney.id.au>
Message-ID: <87zl2oufl4.fsf@castleamber.com>

Ben Finney <ben+python at benfinney.id.au> writes:

> Terry Reedy <tjreedy at udel.edu> writes:
>
>> On 3/3/2010 12:05 PM, John Nagle wrote:
>> > CPAN is a repository. PyPi is an collection of links.
>>
>> As Ben said, PyPI currently is also a respository and not just links
>> to other repositories.

[..]

>> > CPAN enforces standard organization on packages. PyPi does not.
>
> This is, I think, something we don't need as much in Python; there is a
> fundamental difference between Perl's deeply nested namespace hierarchy
> and Python's inherently flat hierarchy.

Perl's hierarchy is 2 (e.g. Text::Balanced) or 3 levels deep
(e.g. Text::Ngram::LanguageDetermine), rarely deeper
(Text::Editor::Vip::Buffer::Plugins::Display). Which is in general most
likely just one level deeper than Python. Perl is not Java.

And I think that one additional level (or more) is a /must/ when you
have 17,530 (at the time of writing) modules.

If Python wants it's own CPAN it might be a good first move to not have
modules named "xmlrpclib", "wave", "keyword", "zlib", etc. But I don't
see that happen soon :-).

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From steve at holdenweb.com  Thu Mar  4 13:07:33 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 04 Mar 2010 13:07:33 -0500
Subject: memory usage, temporary and otherwise
In-Reply-To: <Xns9D317E4A4CAD5duncanbooth@127.0.0.1>
References: <mailman.220.1267642060.23598.python-list@python.org>
	<Xns9D317E4A4CAD5duncanbooth@127.0.0.1>
Message-ID: <hmosta$imp$1@dough.gmane.org>

Duncan Booth wrote:
> mk <mrkafk at gmail.com> wrote:
> 
>> Hm, apparently Python didn't spot that 'spam'*10 in a's values is really 
>> the same string, right?
> 
> If you want it to spot that then give it a hint that it should be looking 
> for identical strings:
> 
>  >>> a={}
>  >>> for i in range(10000000):
> ...     a[i]=intern('spam'*10)
> 
> should reduce your memory use somewhat.
> 
Better still, hoist the constant value out of the loop:

 >>> a={}
 >>> const = 'spam'*10
 >>> for i in range(10000000):
 ...     a[i] = const


regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Thu Mar  4 13:14:35 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 04 Mar 2010 13:14:35 -0500
Subject: WANTED: A good name for the pair (args, kwargs)
In-Reply-To: <hmo94l$9hb$1@south.jnrs.ja.net>
References: <hmo94l$9hb$1@south.jnrs.ja.net>
Message-ID: <hmotah$l00$1@dough.gmane.org>

Jonathan Fine wrote:
> Hi
> 
> We can call a function fn using
>     val = fn(*args, **kwargs)
> 
> I'm looking for a good name for the pair (args, kwargs).  Any suggestions?
> 
> Here's my use case:
>     def doit(fn , wibble, expect):
>         args, kwargs = wibble
>         actual = fn(*args, **kwargs)
>         if actual != expect:
>             # Something has gone wrong.
>             pass
> 
> This is part of a test runner.
> 
> For now I'll use argpair, but if anyone has a better idea, I'll use it.
> 
Not being able to find any existing names I called *args the
sequence-parameter and **kwarg the dict-parameter.

For your use, though, you might choose something like the "generic
parameter pair).

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From jeanmichel at sequans.com  Thu Mar  4 13:22:32 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Thu, 04 Mar 2010 19:22:32 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <hmos6c$fca$1@news.urz.uni-heidelberg.de>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>	<hmokot$uso$1@news.eternal-september.org>	<mailman.295.1267720340.23598.python-list@python.org>
	<hmos6c$fca$1@news.urz.uni-heidelberg.de>
Message-ID: <4B8FFA68.20000@sequans.com>

Michael Rudolf wrote:
> Am 04.03.2010 17:32, schrieb Jean-Michel Pichavant:
>> It looks like to me that 'with' statements are like decorators: 
>> overrated.
>
> Oh no, you just insulted my favourite two python features, followed 
> immediately by generators, iterators and list comprehensions / 
> generator expressions :p
>
> No, really: they *are* great ;D
>
> Regards,
> Michael
They are great, and because of that greatness some of us, including me, 
tend to use them where there's no point doing so.
I would never state that decorators are useless anyway, not in this 
list, I value my life too much :-) (I'll give it a try in the perl list)

JM


From alfps at start.no  Thu Mar  4 13:37:23 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Thu, 04 Mar 2010 19:37:23 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.300.1267723245.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>	<hmn03d$5r6$1@news.eternal-september.org>	<mailman.292.1267717742.23598.python-list@python.org>	<hmooo6$pg0$1@news.eternal-september.org>
	<mailman.300.1267723245.23598.python-list@python.org>
Message-ID: <hmoul7$2i9$1@news.eternal-september.org>

* Robert Kern:
> On 2010-03-04 10:56 AM, Alf P. Steinbach wrote:
>> * Robert Kern:
>>> On 2010-03-03 18:49 PM, Alf P. Steinbach wrote:
[snippety]
>>>
>>>> If you call the possibly failing operation "A", then that systematic
>>>> approach goes like this: if A fails, then it has cleaned up its own
>>>> mess, but if A succeeds, then it's the responsibility of the calling
>>>> code to clean up if the higher level (multiple statements) operation
>>>> that A is embedded in, fails.
>>>>
>>>> And that's what Marginean's original C++ ScopeGuard was designed for,
>>>> and what the corresponding Python Cleanup class is designed for.
>>>
>>> And try: finally:, for that matter.
>>
>> Not to mention "with".
>>
>> Some other poster made the same error recently in this thread; it is a
>> common fallacy in discussions about programming, to assume that since
>> the same can be expressed using lower level constructs, those are all
>> that are required.
>>
>> If adopted as true it ultimately means the removal of all control
>> structures above the level of "if" and "goto" (except Python doesn't
>> have "goto").
> 
> What I'm trying to explain is that the with: statement has a use even if 
> Cleanup doesn't. Arguing that Cleanup doesn't improve on try: finally: 
> does not mean that the with: statement doesn't improve on try: finally:.

That's a different argument, essentially that you see no advantage for your 
current coding patterns.

It's unconnected to the argument I responded to.

The argument that I responded to, that the possibility of expressing things at 
the level of try:finally: means that a higher level construct is superfluous, is 
still meaningless.



>>>>> Both formulations can be correct (and both work perfectly fine with
>>>>> the chdir() example being used). Sometimes one is better than the
>>>>> other, and sometimes not. You can achieve both ways with either your
>>>>> Cleanup class or with try: finally:.
>>>>>
>>>>> I am still of the opinion that Cleanup is not an improvement over try:
>>>>> finally: and has the significant ugliness of forcing cleanup code into
>>>>> callables. This significantly limits what you can do in your cleanup
>>>>> code.
>>>>
>>>> Uhm, not really. :-) As I see it.
>>>
>>> Well, not being able to affect the namespace is a significant
>>> limitation. Sometimes you need to delete objects from the namespace in
>>> order to ensure that their refcounts go to zero and their cleanup code
>>> gets executed.
>>
>> Just a nit (I agree that a lambda can't do this, but as to what's
>> required): assigning None is sufficient for that[1].
> 
> Yes, but no callable is going to allow you to assign None to names in 
> that namespace, either. Not without sys._getframe() hackery, in any case.
> 
>> However, note that the current language doesn't guarantee such cleanup,
>> at least as far as I know.
>>
>> So while it's good practice to support it, to do everything to let it
>> happen, it's presumably bad practice to rely on it happening.
>>
>>
>>> Tracebacks will keep the namespace alive and all objects in it.
>>
>> Thanks!, I hadn't thought of connecting that to general cleanup actions.
>>
>> It limits the use of general "with" in the same way.
> 
> Not really.

Sorry, it limits general 'with' in /exactly/ the same way.


> It's easy to write context managers that do that [delete objects from the namespace].

Sorry, no can do, as far as I know; your following example quoted below is an 
example of /something else/.

And adding on top of irrelevancy, for the pure technical aspect it can be 
accomplished in the same way using Cleanup (I provide an example below).

However, doing that would generally be worse than pointless since with good 
coding practices the objects would become unreferenced anyway.


> You put 
> the initialization code in the __enter__() method, assign whatever 
> objects you want to keep around through the with: clause as attributes 
> on the manager, then delete those attributes in the __exit__().

Analogously, if one were to do this thing, then it could be accomplished using a 
Cleanup context manager as follows:

   foo = lambda: None
   foo.x = create_some_object()
   at_cleanup.call( lambda o = foo: delattr( o, "x" ) )

... except that

   1) for a once-only case this is less code :-)

   2) it is a usage that I wouldn't recommend; instead I recommend adopting good
      coding practices where object references aren't kept around.


> Or, you 
> use the @contextmanager decorator to turn a generator into a context 
> manager, and you just assign to local variables and del them in the 
> finally: clause.

Uhm, you don't need a 'finally' clause when you define a context manager.

Additionally, you don't need to 'del' the local variables in @contextmanager 
decorated generator.

The local variables cease to exist automatically.


> What you can't do is write a generic context manager where the 
> initialization happens inside the with: clause and the cleanup actions 
> are registered callables. That does not allow you to affect the namespace.

If you mean that you can't introduce direct local variables and have them 
deleted by "registered callables" in a portable way, then right.

But I can't think of any example where that would be relevant; in particular 
what matters for supporting on-destruction cleanup is whether you keep any 
references or not, not whether you have a local variable of any given name.

And I think "with" is quite useful even with that restriction.


Cheers,

- Alf



From pemerson at gmail.com  Thu Mar  4 13:39:30 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Thu, 4 Mar 2010 10:39:30 -0800 (PST)
Subject: Evaluate my first python script, please
Message-ID: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>

I've written my first python program, and would love suggestions for
improvement.

I'm a perl programmer and used a perl version of this program to guide
me. So in that sense, the python is "perlesque"

This script parses /etc/hosts for hostnames, and based on terms given
on the command line (argv), either prints the list of hostnames that
match all the criteria, or uses ssh to connect to the host if the
number of matches is unique.

I am looking for advice along the lines of "an easier way to do this"
or "a more python way" (I'm sure that's asking for trouble!) or
"people commonly do this instead" or "here's a slick trick" or "oh,
interesting, here's my version to do the same thing".

I am aware that there are performance improvements and error checking
that could be made, such as making sure the file exists and is
readable and precompiling the regular expressions and not calculating
how many sys.argv arguments there are more than once. I'm not hyper
concerned with performance or idiot proofing for this particular
script.

Thanks in advance.

########################################################
#!/usr/bin/python

import sys, fileinput, re, os

filename = '/etc/hosts'

hosts = []

for line in open(filename, 'r'):
	match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line)
	if match is None or re.search('^(?:float|localhost)\.', line):
continue
	hostname = match.group(1)
	count = 0
	for arg in sys.argv[1:]:
		for section in hostname.split('.'):
			if section == arg:
				count = count + 1
				break
	if count == len(sys.argv) - 1:
		hosts.append(hostname)

if len(hosts) == 1:
	os.system("ssh -A " + hosts[0])
else:
	print '\n'.join(hosts)


From as at sci.fi  Thu Mar  4 13:43:19 2010
From: as at sci.fi (Anssi Saari)
Date: Thu, 04 Mar 2010 20:43:19 +0200
Subject: pyao makes the right sound but why?
References: <mailman.192.1267627812.23598.python-list@python.org>
Message-ID: <vg3k4tskjw8.fsf@pepper.modeemi.cs.tut.fi>

"'2+" <electriclightheads at gmail.com> writes:

> dev = ao.AudioDevice('alsa')
> dev.play(x)
>
> could launch me a semi realtime dj kinda sys
> luckily .. it does seem to be making the right sound
> but why?
> the default of the samplerate and that 16bit happened to match with my thing x?

Yes, that seems to be the case from help(ao). But I couldn't run 
tofu = soy.Bean() since it seems to want tit01.wav. Do you make that
available somewhere?


From tim.wintle at teamrubber.com  Thu Mar  4 14:07:24 2010
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 04 Mar 2010 19:07:24 +0000
Subject: Evaluate my first python script, please
In-Reply-To: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
Message-ID: <1267729644.11093.11.camel@localhost>

On Thu, 2010-03-04 at 10:39 -0800, Pete Emerson wrote:
> I am looking for advice along the lines of "an easier way to do this"
> or "a more python way" (I'm sure that's asking for trouble!) or
> "people commonly do this instead" or "here's a slick trick" or "oh,
> interesting, here's my version to do the same thing".

(1) I would wrap it all in a function

def main():
    # your code here

if __name__ == "__main__":
    main()

(2) PEP8 (python style guidelines) suggests one import per line

(3) I'd use four spaces as tab width

(4) 
I'd change this:

>     for arg in sys.argv[1:]:
>         for section in hostname.split('.'):
>             if section == arg:
>                 count = count + 1
>                 break

to something more like:

    for section in hostname.split("."):
        if section in sys.argv[1:]:
            count += 1

(although as you suggested I'd only calculate sys.argv[1:] once)

... or you could replace whole section between the for loop and
hosts.append with:

    if sorted(hostname.split(".")) == sorted(sys.argv[1:]):
        host.append(hostname)


, at a slight loss of clarity - but I think I'd stick with the more
verbose version personally.

Tim





From stefan_ml at behnel.de  Thu Mar  4 14:10:47 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Thu, 04 Mar 2010 20:10:47 +0100
Subject: Partly erratic wrong behaviour, Python 3, lxml
In-Reply-To: <qotr5o0xt3l.fsf@ruuvi.it.helsinki.fi>
References: <qotr5o0xt3l.fsf@ruuvi.it.helsinki.fi>
Message-ID: <hmp0jq$2a9$1@dough.gmane.org>

Jussi Piitulainen, 04.03.2010 11:46:
> I am observing weird semi-erratic behaviour that involves Python 3 and
> lxml, is extremely sensitive to changes in the input data, and only
> occurs when I name a partial result. I would like some help with this,
> please. (Python 3.1.1; GNU/Linux; how do I find lxml version?)

Here's how to find the version:

http://codespeak.net/lxml/FAQ.html#i-think-i-have-found-a-bug-in-lxml-what-should-i-do

I'll give your test code a try when I get to it. However, note that the 
best place to discuss this is the lxml mailing list:

http://codespeak.net/mailman/listinfo/lxml-dev

Stefan



From duncan.booth at invalid.invalid  Thu Mar  4 14:15:42 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 4 Mar 2010 19:15:42 GMT
Subject: NoSQL Movement?
References: <Xns9D318550EF1D6duncanbooth@127.0.0.1>
	<mailman.289.1267714060.23598.python-list@python.org>
Message-ID: <Xns9D31C31E6FFA3duncanbooth@127.0.0.1>

mk <mrkafk at gmail.com> wrote:

> Duncan Booth wrote:
> 
>> If you look at some of the uses of bigtable you may begin to
>> understand the tradeoffs that are made with sql. When you use
>> bigtable you have records with fields, and you have indices, but
>> there are limitations on the kinds of queries you can perform: in
>> particular you cannot do joins, but more subtly there is no guarantee
>> that the index is up to date (so you might miss recent updates or
>> even get data back from a query when the data no longer matches the
>> query). 
> 
> Hmm, I do understand that bigtable is used outside of traditional 
> 'enterprisey' contexts, but suppose you did want to do an equivalent
> of join; is it at all practical or even possible?
> 
> I guess when you're forced to use denormalized data, you have to 
> simultaneously update equivalent columns across many tables yourself, 
> right? Or is there some machinery to assist in that?

Or you avoid having to do that sort of update at all.

There are many applications which simply wouldn't be applicable to 
bigtable. My point was that to make best use of bigtable you may have to 
make different decisions when designing the software.

> 
>> By sacrificing some of SQL's power, Google get big benefits: namely 
>> updating data is a much more localised option. Instead of an update 
>> having to lock the indices while they are updated, updates to
>> different records can happen simultaneously possibly on servers on
>> the opposite sides of the world. You can have many, many servers all
>> using the same data although they may not have identical or
>> completely consistent views of that data.
> 
> And you still have the global view of the table spread across, say, 2 
> servers, one located in Australia, second in US?
> 
More likely spread across a few thousand servers. The data migrates round 
the servers as required. As I understand it records are organised in 
groups: when you create a record you can either make it a root record or 
you can give it a parent record. So for example you might make all the data 
associated with a specific user live with the user record as a parent (or 
ancestor). When you access any of that data then all of it is copied onto a 
server near the application as all records under a common root are always 
stored together.

>> Bigtable impacts on how you store the data: for example you need to 
>> avoid reducing data to normal form (no joins!), its much better and 
>> cheaper just to store all the data you need directly in each record. 
>> Also aggregate values need to be at least partly pre-computed and
>> stored in the database.
> 
> So you basically end up with a few big tables or just one big table
> really? 

One. Did I mention that bigtable doesn't require you to have the same 
columns in every record? The main use of bigtable (outside of Google's 
internal use) is Google App Engine and that apparently uses one table.

Not one table per application, one table total. It's a big table.

> 
> Suppose on top of 'tweets' table you have 'dweebs' table, and tweets
> and dweebs sometimes do interact. How would you find such interacting
> pairs? Would you say "give me some tweets" to tweets table, extract
> all the dweeb_id keys from tweets and then retrieve all dweebs from
> dweebs table? 

If it is one tweet to many dweebs?

  Dweeb.all().filter("tweet =", tweet.key())
or:
  GqlQuery("SELECT * FROM Dweeb WHERE tweet = :tweet", tweet=tweet)

or just make the tweet the ancestor of all its dweebs.

Columns may be scalars or lists, so if it is some tweets to many dweebs you 
can do basically the same thing.

  Dweeb.all().filter("tweets =", tweet.key())

but if there are too many tweets in the list that could be a problem.

If you want dweebs for several tweets you could select with "tweet IN " the 
list of tweets or do a separate query for each (not much difference, as I 
understand it the IN operator just expands into several queries internally 
anyway).


From pruebauno at latinmail.com  Thu Mar  4 14:18:49 2010
From: pruebauno at latinmail.com (nn)
Date: Thu, 4 Mar 2010 11:18:49 -0800 (PST)
Subject: loop over list and process into groups
References: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>
	<5e9126f7-f9e2-4c38-8dd5-dc174204fd71@d27g2000yqf.googlegroups.com>
Message-ID: <865d59ab-585b-4908-be0d-e891d0a0a08b@t23g2000yqt.googlegroups.com>



lbolla wrote:
> On Mar 4, 3:57?pm, Sneaky Wombat <joe.hr... at gmail.com> wrote:
> > [ {'vlan_or_intf': 'VLAN2021'},
> > ?{'vlan_or_intf': 'Interface'},
> > ?{'vlan_or_intf': 'Po1'},
> > ?{'vlan_or_intf': 'Po306'},
> > ?{'vlan_or_intf': 'VLAN2022'},
> > ?{'vlan_or_intf': 'Interface'},
> > ?{'vlan_or_intf': 'Gi7/33'},
> > ?{'vlan_or_intf': 'Po1'},
> > ?{'vlan_or_intf': 'Po306'},
> > ?{'vlan_or_intf': 'VLAN2051'},
> > ?{'vlan_or_intf': 'Interface'},
> > ?{'vlan_or_intf': 'Gi9/6'},
> > ?{'vlan_or_intf': 'VLAN2052'},
> > ?{'vlan_or_intf': 'Interface'},
> > ?{'vlan_or_intf': 'Gi9/6'},]
> >
> > I want it to be converted to:
> >
> > [{'2021':['Po1','Po306']},{'2022':['Gi7/33','Po1','Po306']},etc etc]
> >
> > I was going to write a def to loop through and look for certain pre-
> > compiled regexs, and then put them in a new dictionary and append to a
> > list, but I'm having trouble thinking of a good way to capture each
> > dictionary. ?Each dictionary will have a key that is the vlan and the
> > value will be a list of interfaces that participate in that vlan.
> > Each list will be variable, many containing only one interface and
> > some containing many interfaces.
> >
> > I thought about using itertools, but i only use that for fixed data.
> > I don't know of a good way to loop over variably sized data. ?I was
> > wondering if anyone had any ideas about a good way to convert this
> > list or dictionary into the right format that I need. ?The solution I
> > come up with will most likely be ugly and error prone, so I thought
> > i'd ask this python list while I work. ?Hopefully I learn a better way
> > to solve this problem.
> >
> > Thanks!
> >
> > I also have the data in a list,
> >
> > [ 'VLAN4065',
> > ?'Interface',
> > ?'Gi9/6',
> > ?'Po2',
> > ?'Po3',
> > ?'Po306',
> > ?'VLAN4068',
> > ?'Interface',
> > ?'Gi9/6',
> > ?'VLAN4069',
> > ?'Interface',
> > ?'Gi9/6',]
>
>
>
> ===================================
>
> from itertools import groupby
>
> data = \
> [ {'vlan_or_intf': 'VLAN2021'},
>  {'vlan_or_intf': 'Interface'},
>  {'vlan_or_intf': 'Po1'},
>  {'vlan_or_intf': 'Po306'},
>  {'vlan_or_intf': 'VLAN2022'},
>  {'vlan_or_intf': 'Interface'},
>  {'vlan_or_intf': 'Gi7/33'},
>  {'vlan_or_intf': 'Po1'},
>  {'vlan_or_intf': 'Po306'},
>  {'vlan_or_intf': 'VLAN2051'},
>  {'vlan_or_intf': 'Interface'},
>  {'vlan_or_intf': 'Gi9/6'},
>  {'vlan_or_intf': 'VLAN2052'},
>  {'vlan_or_intf': 'Interface'},
>  {'vlan_or_intf': 'Gi9/6'},]
>
> def clean_up(lst):
> 	return [d.values()[0] for d in data if d.values()[0] != 'Interface']
>
> out = {}
> for k, g in groupby(clean_up(data) , key=lambda s:
> s.startswith('VLAN')):
> 	if k:
> 		key = list(g)[0].replace('VLAN','')
> 	else:
> 		out[key] = list(g)
>
> print out
> ===================================
>
> hth,
> L.

Good use of groupby. Here is what I ended up coming up:

from itertools import groupby
laninfo=[ 'VLAN4065',
 'Interface',
 'Gi9/6',
 'Po2',
 'Po3',
 'Po306',
 'VLAN4068',
 'Interface',
 'Gi9/6',
 'VLAN4069',
 'Interface',
 'Gi9/6',]

def splitgrp(s, f=[False]):
   f[0]^=s.startswith('VLAN')
   return f[0]
lanlst=(list(g) for k,g in groupby(laninfo,key=splitgrp))
out={item[0][4:]:item[2:] for item in lanlst}
print(out)


From db3l.net at gmail.com  Thu Mar  4 14:21:58 2010
From: db3l.net at gmail.com (David Bolen)
Date: Thu, 04 Mar 2010 14:21:58 -0500
Subject: Generic singleton
References: <mailman.222.1267642515.23598.python-list@python.org>
	<pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>
	<Xns9D317DB33C63Aduncanbooth@127.0.0.1>
Message-ID: <m2ocj3nb8p.fsf@valheru.db3l.homeip.net>

Duncan Booth <duncan.booth at invalid.invalid> writes:

> It is also *everywhere* in the Python world. Unlike Java and C++, Python 
> even has its own built-in type for singletons.
>
> If you want a singleton in Python use a module.
>
> So the OP's original examples become:
>
> --- file singleton.py ---
> foo = {}
> bar = []
>
> --- other.py ---
> from singleton import foo as s1
> from singleton import foo as s2
> from singleton import bar as s3
> from singleton import bar as s4
>
> ... and then use them as you wish.

In the event you do use a module as a singleton container, I would
advocate sticking with fully qualified names, avoiding the use of
"from" imports or any other local namespace caching of references.

Other code sharing the module may not update things as expected, e.g.:

    import singleton

    singleton.foo = {}

at which point you've got two objects around - one in the singleton.py
module namespace, and the s1/s2 referenced object in other.py.

If you're confident of the usage pattern of all the using code, it may
not be critical.  But consistently using "singleton.foo" (or an import
alias like s.foo) is a bit more robust, sticking with only one
namespace to reach the singleton.

-- David




From python at mrabarnett.plus.com  Thu Mar  4 14:30:55 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 04 Mar 2010 19:30:55 +0000
Subject: Evaluate my first python script, please
In-Reply-To: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
Message-ID: <4B900A6F.40104@mrabarnett.plus.com>

Pete Emerson wrote:
> I've written my first python program, and would love suggestions for
> improvement.
> 
> I'm a perl programmer and used a perl version of this program to guide
> me. So in that sense, the python is "perlesque"
> 
> This script parses /etc/hosts for hostnames, and based on terms given
> on the command line (argv), either prints the list of hostnames that
> match all the criteria, or uses ssh to connect to the host if the
> number of matches is unique.
> 
> I am looking for advice along the lines of "an easier way to do this"
> or "a more python way" (I'm sure that's asking for trouble!) or
> "people commonly do this instead" or "here's a slick trick" or "oh,
> interesting, here's my version to do the same thing".
> 
> I am aware that there are performance improvements and error checking
> that could be made, such as making sure the file exists and is
> readable and precompiling the regular expressions and not calculating
> how many sys.argv arguments there are more than once. I'm not hyper
> concerned with performance or idiot proofing for this particular
> script.
> 
> Thanks in advance.
> 
> ########################################################
> #!/usr/bin/python
> 
> import sys, fileinput, re, os
> 
> filename = '/etc/hosts'
> 
> hosts = []
> 
> for line in open(filename, 'r'):
> 	match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line)

Use 'raw' strings for regular expressions.

'Normal' Python string literals use backslashes in escape sequences (eg,
'\n'), but so do regular expressions, and regular expressions are passed
to the 're' module in strings, so that can lead to a profusion of
backslashes!

You could either escape the backslashes:

  	match = re.search('\\d+\\.\\d+\\.\\d+\\.\\d+\s+(\\S+)', line)

or use a raw string:

  	match = re.search(r'\d+\.\d+\.\d+\.\d+\s+(\S+)', line)

A raw string literal is just like a normal string literal, except that
backslashes aren't special.

> 	if match is None or re.search('^(?:float|localhost)\.', line):
> continue

It would be more 'Pythonic' to say "not match".

	if not match or re.search(r'^(?:float|localhost)\.', line):

> 	hostname = match.group(1)
> 	count = 0
> 	for arg in sys.argv[1:]:
> 		for section in hostname.split('.'):
> 			if section == arg:
> 				count = count + 1

Shorter is:

				count += 1

> 				break
> 	if count == len(sys.argv) - 1:
> 		hosts.append(hostname)
> 
> if len(hosts) == 1:
> 	os.system("ssh -A " + hosts[0])
> else:
> 	print '\n'.join(hosts)

You're splitting the hostname repeatedly. You could split it just once,
outside the outer loop, and maybe make it into a set. You could then
have:

         host_parts = set(hostname.split('.'))
	count = 0
	for arg in sys.argv[1:]:
		if arg in host_parts:
			count += 1

Incidentally, the re module contains a cache, so the regular expressions
won't be recompiled every time (unless you have a lot of them and the re
module flushes the cache).


From robert.kern at gmail.com  Thu Mar  4 14:37:29 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 04 Mar 2010 13:37:29 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <hmoul7$2i9$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>	<hmn03d$5r6$1@news.eternal-september.org>	<mailman.292.1267717742.23598.python-list@python.org>	<hmooo6$pg0$1@news.eternal-september.org>	<mailman.300.1267723245.23598.python-list@python.org>
	<hmoul7$2i9$1@news.eternal-september.org>
Message-ID: <hmp25r$7te$1@dough.gmane.org>

On 2010-03-04 12:37 PM, Alf P. Steinbach wrote:
> * Robert Kern:
>> On 2010-03-04 10:56 AM, Alf P. Steinbach wrote:
>>> * Robert Kern:
>>>> On 2010-03-03 18:49 PM, Alf P. Steinbach wrote:
> [snippety]
>>>>
>>>>> If you call the possibly failing operation "A", then that systematic
>>>>> approach goes like this: if A fails, then it has cleaned up its own
>>>>> mess, but if A succeeds, then it's the responsibility of the calling
>>>>> code to clean up if the higher level (multiple statements) operation
>>>>> that A is embedded in, fails.
>>>>>
>>>>> And that's what Marginean's original C++ ScopeGuard was designed for,
>>>>> and what the corresponding Python Cleanup class is designed for.
>>>>
>>>> And try: finally:, for that matter.
>>>
>>> Not to mention "with".
>>>
>>> Some other poster made the same error recently in this thread; it is a
>>> common fallacy in discussions about programming, to assume that since
>>> the same can be expressed using lower level constructs, those are all
>>> that are required.
>>>
>>> If adopted as true it ultimately means the removal of all control
>>> structures above the level of "if" and "goto" (except Python doesn't
>>> have "goto").
>>
>> What I'm trying to explain is that the with: statement has a use even
>> if Cleanup doesn't. Arguing that Cleanup doesn't improve on try:
>> finally: does not mean that the with: statement doesn't improve on
>> try: finally:.
>
> That's a different argument, essentially that you see no advantage for
> your current coding patterns.
>
> It's unconnected to the argument I responded to.
>
> The argument that I responded to, that the possibility of expressing
> things at the level of try:finally: means that a higher level construct
> is superfluous, is still meaningless.

I am attacking your premise that the "with Cleanup():" construct is higher level 
than try: finally:. It isn't. It provides the same level of abstraction as try: 
finally:.

This is distinct from the accepted uses of the with: statement which *are* 
higher level than try: finally: and which do confer practical benefits over 
using try: finally: despite being syntactical sugar for try: finally:.

>>>>>> Both formulations can be correct (and both work perfectly fine with
>>>>>> the chdir() example being used). Sometimes one is better than the
>>>>>> other, and sometimes not. You can achieve both ways with either your
>>>>>> Cleanup class or with try: finally:.
>>>>>>
>>>>>> I am still of the opinion that Cleanup is not an improvement over
>>>>>> try:
>>>>>> finally: and has the significant ugliness of forcing cleanup code
>>>>>> into
>>>>>> callables. This significantly limits what you can do in your cleanup
>>>>>> code.
>>>>>
>>>>> Uhm, not really. :-) As I see it.
>>>>
>>>> Well, not being able to affect the namespace is a significant
>>>> limitation. Sometimes you need to delete objects from the namespace in
>>>> order to ensure that their refcounts go to zero and their cleanup code
>>>> gets executed.
>>>
>>> Just a nit (I agree that a lambda can't do this, but as to what's
>>> required): assigning None is sufficient for that[1].
>>
>> Yes, but no callable is going to allow you to assign None to names in
>> that namespace, either. Not without sys._getframe() hackery, in any case.
>>
>>> However, note that the current language doesn't guarantee such cleanup,
>>> at least as far as I know.
>>>
>>> So while it's good practice to support it, to do everything to let it
>>> happen, it's presumably bad practice to rely on it happening.
>>>
>>>
>>>> Tracebacks will keep the namespace alive and all objects in it.
>>>
>>> Thanks!, I hadn't thought of connecting that to general cleanup actions.
>>>
>>> It limits the use of general "with" in the same way.
>>
>> Not really.
>
> Sorry, it limits general 'with' in /exactly/ the same way.
>
>> It's easy to write context managers that do that [delete objects from
>> the namespace].
>
> Sorry, no can do, as far as I know; your following example quoted below
> is an example of /something else/.

Okay, so what do you mean by 'the use of general "with"'? I'm talking about 
writing a context manager or using the @contextmanager decorator to do some 
initialization and then later cleaning up that initialization. That cleaning up 
may entail deleting an object. You are correct that the context manager can't 
affect the namespace of the with: clause, but that's not the initialization that 
it would need to clean up.

Yes, you can write code with a with: statement where you try to clean up stuff 
that happened inside of the clause (you did), but that's not how the with: 
statement was ever intended to be used nor is it good practice to do so because 
of that limitation. Context managers are designed to initialize specific things, 
then clean them up. I thought you were talking about the uses of the with: 
statement as described in PEP-343, not every possible misuse of the with: statement.

> And adding on top of irrelevancy, for the pure technical aspect it can
> be accomplished in the same way using Cleanup (I provide an example below).
>
> However, doing that would generally be worse than pointless since with
> good coding practices the objects would become unreferenced anyway.
>
>
>> You put the initialization code in the __enter__() method, assign
>> whatever objects you want to keep around through the with: clause as
>> attributes on the manager, then delete those attributes in the
>> __exit__().
>
> Analogously, if one were to do this thing, then it could be accomplished
> using a Cleanup context manager as follows:
>
> foo = lambda: None
> foo.x = create_some_object()
> at_cleanup.call( lambda o = foo: delattr( o, "x" ) )
>
> ... except that
>
> 1) for a once-only case this is less code :-)

Not compared to a try: finally:, it isn't.

> 2) it is a usage that I wouldn't recommend; instead I recommend adopting
> good
> coding practices where object references aren't kept around.

Many of the use cases of the with: statement involve creating an object (like a 
lock or a transaction object), keeping it around for the duration of the "# Do 
stuff" block, and then finalizing it.

>> Or, you use the @contextmanager decorator to turn a generator into a
>> context manager, and you just assign to local variables and del them
>> in the finally: clause.
>
> Uhm, you don't need a 'finally' clause when you define a context manager.

When you use the @contextmanager decorator, you almost always do. See the 
Examples section of PEP 343:

   http://www.python.org/dev/peps/pep-0343/

> Additionally, you don't need to 'del' the local variables in
> @contextmanager decorated generator.
>
> The local variables cease to exist automatically.

True.

>> What you can't do is write a generic context manager where the
>> initialization happens inside the with: clause and the cleanup actions
>> are registered callables. That does not allow you to affect the
>> namespace.
>
> If you mean that you can't introduce direct local variables and have
> them deleted by "registered callables" in a portable way, then right.
>
> But I can't think of any example where that would be relevant; in
> particular what matters for supporting on-destruction cleanup is whether
> you keep any references or not, not whether you have a local variable of
> any given name.

Well, local variables keep references to objects. Variable assignment followed 
by deletion is a very readable way to keep an object around for a while then 
remove it later. If you have to go through less readable contortions to keep the 
object around when it needs to be and clean it up later, then that is a mark 
against your approach.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From steve at holdenweb.com  Thu Mar  4 14:49:27 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 04 Mar 2010 14:49:27 -0500
Subject: A "scopeguard" for Python
In-Reply-To: <hmop33$rrj$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>	<hmokot$uso$1@news.eternal-september.org>	<mailman.293.1267718664.23598.python-list@python.org>
	<hmop33$rrj$1@news.eternal-september.org>
Message-ID: <hmp2sf$8d1$1@dough.gmane.org>

Alf P. Steinbach wrote:
> * Robert Kern:
[...]
>> No, it only argues that "with Cleanup():" is supernumerary.
> 
> I don't know what "supernumerary" means, but to the degree that the
> argument says anything about a construct that is not 'finally', it says
> the same about general "with".
> 
So rather than look up the meaning if a word you aren't familiar with
you will argue against its use in generic style?

> So whatever you mean by supernumerary, you're saying that the argument
> implies that "with" is supernumerary.
> 
> This is starting to look like some earlier discussions in this group,
> where even basic logic is denied.
> 
Why not just stick to the facts and forget about the earlier discussions?

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From pruebauno at latinmail.com  Thu Mar  4 14:54:55 2010
From: pruebauno at latinmail.com (nn)
Date: Thu, 4 Mar 2010 11:54:55 -0800 (PST)
Subject: Evaluate my first python script, please
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
	<mailman.309.1267731058.23598.python-list@python.org>
Message-ID: <9b598cad-3069-49a9-b2d0-378e973a8ce2@x22g2000yqx.googlegroups.com>

On Mar 4, 2:30?pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
> Pete Emerson wrote:
> > I've written my first python program, and would love suggestions for
> > improvement.
>
> > I'm a perl programmer and used a perl version of this program to guide
> > me. So in that sense, the python is "perlesque"
>
> > This script parses /etc/hosts for hostnames, and based on terms given
> > on the command line (argv), either prints the list of hostnames that
> > match all the criteria, or uses ssh to connect to the host if the
> > number of matches is unique.
>
> > I am looking for advice along the lines of "an easier way to do this"
> > or "a more python way" (I'm sure that's asking for trouble!) or
> > "people commonly do this instead" or "here's a slick trick" or "oh,
> > interesting, here's my version to do the same thing".
>
> > I am aware that there are performance improvements and error checking
> > that could be made, such as making sure the file exists and is
> > readable and precompiling the regular expressions and not calculating
> > how many sys.argv arguments there are more than once. I'm not hyper
> > concerned with performance or idiot proofing for this particular
> > script.
>
> > Thanks in advance.
>
> > ########################################################
> > #!/usr/bin/python
>
> > import sys, fileinput, re, os
>
> > filename = '/etc/hosts'
>
> > hosts = []
>
> > for line in open(filename, 'r'):
> > ? ?match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line)
>
> Use 'raw' strings for regular expressions.
>
> 'Normal' Python string literals use backslashes in escape sequences (eg,
> '\n'), but so do regular expressions, and regular expressions are passed
> to the 're' module in strings, so that can lead to a profusion of
> backslashes!
>
> You could either escape the backslashes:
>
> ? ? ? ? match = re.search('\\d+\\.\\d+\\.\\d+\\.\\d+\s+(\\S+)', line)
>
> or use a raw string:
>
> ? ? ? ? match = re.search(r'\d+\.\d+\.\d+\.\d+\s+(\S+)', line)
>
> A raw string literal is just like a normal string literal, except that
> backslashes aren't special.
>
> > ? ?if match is None or re.search('^(?:float|localhost)\.', line):
> > continue
>
> It would be more 'Pythonic' to say "not match".
>
> ? ? ? ? if not match or re.search(r'^(?:float|localhost)\.', line):
>
> > ? ?hostname = match.group(1)
> > ? ?count = 0
> > ? ?for arg in sys.argv[1:]:
> > ? ? ? ? ? ?for section in hostname.split('.'):
> > ? ? ? ? ? ? ? ? ? ?if section == arg:
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ?count = count + 1
>
> Shorter is:
>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? count += 1
>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ?break
> > ? ?if count == len(sys.argv) - 1:
> > ? ? ? ? ? ?hosts.append(hostname)
>
> > if len(hosts) == 1:
> > ? ?os.system("ssh -A " + hosts[0])
> > else:
> > ? ?print '\n'.join(hosts)
>
> You're splitting the hostname repeatedly. You could split it just once,
> outside the outer loop, and maybe make it into a set. You could then
> have:
>
> ? ? ? ? ?host_parts = set(hostname.split('.'))
> ? ? ? ? count = 0
> ? ? ? ? for arg in sys.argv[1:]:
> ? ? ? ? ? ? ? ? if arg in host_parts:
> ? ? ? ? ? ? ? ? ? ? ? ? count += 1
>
> Incidentally, the re module contains a cache, so the regular expressions
> won't be recompiled every time (unless you have a lot of them and the re
> module flushes the cache).

I think that you really just need a set intersection for the count
part and this should work:

host_parts = set(hostname.split('.'))
count = len(host_parts.intersection(sys.argv[1:]))



From knipknap at gmail.com  Thu Mar  4 14:55:21 2010
From: knipknap at gmail.com (knipknap)
Date: Thu, 4 Mar 2010 11:55:21 -0800 (PST)
Subject: ANNOUNCE: Exscript 2.0
Message-ID: <18ffe924-0068-42dc-ad36-da3c0ba07308@z35g2000yqd.googlegroups.com>

Introduction
-------------
Exscript is a Python module and template processor for automating
Telnet or SSH sessions. Exscript supports a wide range of features,
such as parallelization, AAA authentication methods, TACACS, and a
very simple template language. Please refer to the project page for
updated documentation (see the links at the bottom of this
announcement).

New since 0.9.16
------------------
Exscript 2.0 is without a doubt the most awesome release of Exscript
ever. It is well tested and has already proven to be robust, so use in
a production environment is encouraged.

Changes in this release:

* Exscript's Python API has been completely overhauled and made a lot
simpler. The new API is well documented [1][2].
* Countless utilities for network administrators using Python were
added. For example, it is now trivial to generate reports and emails,
logging is more configurable, new functions for reading and writing
input and output files were added, and user interaction was
simplified.
* The number of dependencies was reduced to make the installation
easier.
* Exscript is now almost 100% unit tested. That means greatly enhanced
stability and reliability.
* Support for threading was improved, leading to better performance
when using a large number of parallel connections.
* The SSH support was greatly improved.
* Exscript now includes some useful Tkinter widgets for monitoring the
Exscript Queue.
* Support for Pseudo devices: It is now possible to emulate a fake
device that behaves like a router. This can come in handy for testing.
* Of course, a huge number of bugs was also fixed. I expect this
release to be the most stable one to date. It was also well tested in
production and has handled hundreds of thousands of Telnet connections
in the past few months.

Dependencies
-------------
* Python 2.2 or greater
* Python-crypto
* paramiko (optional, for SSH2 support)
* Python-pexpect (optional, for SSH1 support)
* OpenSSH (optional, for SSH1 support)

Download Exscript
------------------
Release: http://github.com/knipknap/exscript/downloads
Git: http://code.google.com/p/exscript/source

Links
------
[1] Exscript Documentation: http://wiki.github.com/knipknap/exscript/documentation
[2] Exscript Python API: http://knipknap.github.com/exscript/api/
[3] Installation Guide: http://wiki.github.com/knipknap/exscript/installation-guide
[4] Exscript home page: http://wiki.github.com/knipknap/exscript/
[5] Mailing list: http://groups.google.com/group/exscript
[6] Bug tracker: http://github.com/knipknap/exscript/issues
[7] Browse the source: http://github.com/knipknap/exscript


From mrmakent at gmail.com  Thu Mar  4 15:48:30 2010
From: mrmakent at gmail.com (Mike Kent)
Date: Thu, 4 Mar 2010 12:48:30 -0800 (PST)
Subject: A "scopeguard" for Python
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<hmm0rd$a48$1@news.eternal-september.org>
Message-ID: <915588d0-e4fd-42d0-b5b5-3506700924ae@q16g2000yqq.googlegroups.com>

On Mar 3, 10:56?am, "Alf P. Steinbach" <al... at start.no> wrote:
> * Mike Kent:
>
> > What's the compelling use case for this vs. a simple try/finally?
>
> if you thought about it you would mean a simple "try/else". "finally" is always
> executed. which is incorrect for cleanup
>
> by the way, that's one advantage:
>
> a "with Cleanup" is difficult to get wrong, while a "try" is easy to get wrong,
> as you did here
>
> ? ?---
>
> another general advantage is as for the 'with' statement generally
>
> > ? ?original_dir = os.getcwd()
> > ? ?try:
> > ? ? ? ?os.chdir(somewhere)
> > ? ? ? ?# Do other stuff
>
> also, the "do other stuff" can be a lot of code
>
> and also, with more than one action the try-else introduces a lot of nesting
>
> > ? ?finally:
> > ? ? ? ?os.chdir(original_dir)
> > ? ? ? ?# Do other cleanup
>
> cheers & hth.,
>
> - alf

Wrong?  In what way is my example wrong?  It cleanly makes sure that
the current working directory is the same after the try/finally as it
was before it.  Suboptimal, perhaps, in that the chdir in the finally
part is always executed, even if the chdir in the try part failed to
change the working directory.

That is a clear advantage to the code you presented, in that you have
the ability to register an 'undo' function only if the 'do' code
succeeded.  Your code also avoids a problem with many nested try/
finally blocks.  But for the simple chdir example you gave, I think
'wrong' isn't the word you were looking for regarding the try/finally
example I gave.

Anyway, I'll keep your code in mind the next time I want to avoid a
bunch of nested try/finally blocks.


From wanderer at dialup4less.com  Thu Mar  4 15:49:08 2010
From: wanderer at dialup4less.com (Wanderer)
Date: Thu, 4 Mar 2010 12:49:08 -0800 (PST)
Subject: Pylint Argument number differs from overridden method
References: <2484ca6e-0eb9-4e0c-a7db-d035badab711@t20g2000yqe.googlegroups.com>
	<mailman.226.1267644846.23598.python-list@python.org>
	<9ca2e014-f238-4b55-8ace-f884b2112a19@z11g2000yqz.googlegroups.com>
	<mailman.276.1267699533.23598.python-list@python.org>
Message-ID: <e4d29c98-ad6b-4e6c-9465-c333e1e0153f@q21g2000yqm.googlegroups.com>

On Mar 4, 5:45?am, Jean-Michel Pichavant <jeanmic... at sequans.com>
wrote:
> Wanderer wrote:
> > On Mar 3, 2:33 pm, Robert Kern <robert.k... at gmail.com> wrote:
>
> >> On 2010-03-03 11:39 AM, Wanderer wrote:
>
> >>> Pylint W0221 gives the warning
> >>> Argument number differs from overridden method.
>
> >>> Why is this a problem? I'm overriding the method to add additional
> >>> functionality.
>
> >> There are exceptions to every guideline. Doing this could easily be a mistake,
> >> so it's one of the many things that Pylint checks for. Silence the warning if
> >> you like.
>
> >> --
> >> Robert Kern
>
> >> "I have come to believe that the whole world is an enigma, a harmless enigma
> >> ? that is made terrible by our own mad attempt to interpret it as though it had
> >> ? an underlying truth."
> >> ? ?-- Umberto Eco
>
> > Thanks I was just wondering if I was overlooking something about
> > inheritance.
>
> This is only my opinion but you get this warning because of 2 disctinct
> issues:
> 1/ you just made a basic mistake in your signature and need to correct it
> 2/ you did not make any mistake in the signature, but this warning may
> reveal a (small) flaw in your class design.
>
> I don't know the exact context for your code, but it's better to have a
> consistant interface over your methods and mask the implementation
> details from the user.
> In your case, the getRays method may always ask for the lambda
> parameters and just ignore it for one of its implementation.
>
> And don't write empty doctrings to trick pylint. Either write them, or
> remove this rule, you are loosing all the tool benefits.
>
> JM

Okay different example. I'm not really using inheritance here but its
the same idea.
The wx.SpinCtrl is annoyingly integer. I want decimal values. so I
created dSpinCtrl.
It adds the argument places. It's a drop in replacement for SpinCtrl.
(okay its not, because I didn't create all the members). If you
replace SpinCtrl with dSpinCtrl the program should work the same
because the new argument places has a default value. I don't see a
problem with more arguments. Less arguments would be a problem.
Expanding functionality from a base class is what I thought
inheritance is about.

class dSpinCtrl():
    """Adds decimal values to SpinCtrl. Almost a drop in replacement
for SpinCtrl.
    Adds 'places' variable for number of places after decimal point
    """

    def __init__ (self,
                  parent,
                  iD = ID_SPIN,
                  value = wx.EmptyString,
                  pos = wx.DefaultPosition,
                  size = wx.DefaultSize,
                  style = wx.SP_ARROW_KEYS,
                  dmin = -100.0,
                  dmax = 100.0,
                  dinitial = 0.0,
                  places = 0):




From sccolbert at gmail.com  Thu Mar  4 16:00:02 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Thu, 4 Mar 2010 16:00:02 -0500
Subject: loop over list and process into groups
In-Reply-To: <865d59ab-585b-4908-be0d-e891d0a0a08b@t23g2000yqt.googlegroups.com>
References: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>
	<5e9126f7-f9e2-4c38-8dd5-dc174204fd71@d27g2000yqf.googlegroups.com>
	<865d59ab-585b-4908-be0d-e891d0a0a08b@t23g2000yqt.googlegroups.com>
Message-ID: <7f014ea61003041300j98500a2y89f414878753b397@mail.gmail.com>

Man, deja-vu, I could have sworn I read this thread months ago...

On Thu, Mar 4, 2010 at 2:18 PM, nn <pruebauno at latinmail.com> wrote:

>
>
> lbolla wrote:
> > On Mar 4, 3:57 pm, Sneaky Wombat <joe.hr... at gmail.com> wrote:
> > > [ {'vlan_or_intf': 'VLAN2021'},
> > >  {'vlan_or_intf': 'Interface'},
> > >  {'vlan_or_intf': 'Po1'},
> > >  {'vlan_or_intf': 'Po306'},
> > >  {'vlan_or_intf': 'VLAN2022'},
> > >  {'vlan_or_intf': 'Interface'},
> > >  {'vlan_or_intf': 'Gi7/33'},
> > >  {'vlan_or_intf': 'Po1'},
> > >  {'vlan_or_intf': 'Po306'},
> > >  {'vlan_or_intf': 'VLAN2051'},
> > >  {'vlan_or_intf': 'Interface'},
> > >  {'vlan_or_intf': 'Gi9/6'},
> > >  {'vlan_or_intf': 'VLAN2052'},
> > >  {'vlan_or_intf': 'Interface'},
> > >  {'vlan_or_intf': 'Gi9/6'},]
> > >
> > > I want it to be converted to:
> > >
> > > [{'2021':['Po1','Po306']},{'2022':['Gi7/33','Po1','Po306']},etc etc]
> > >
> > > I was going to write a def to loop through and look for certain pre-
> > > compiled regexs, and then put them in a new dictionary and append to a
> > > list, but I'm having trouble thinking of a good way to capture each
> > > dictionary.  Each dictionary will have a key that is the vlan and the
> > > value will be a list of interfaces that participate in that vlan.
> > > Each list will be variable, many containing only one interface and
> > > some containing many interfaces.
> > >
> > > I thought about using itertools, but i only use that for fixed data.
> > > I don't know of a good way to loop over variably sized data.  I was
> > > wondering if anyone had any ideas about a good way to convert this
> > > list or dictionary into the right format that I need.  The solution I
> > > come up with will most likely be ugly and error prone, so I thought
> > > i'd ask this python list while I work.  Hopefully I learn a better way
> > > to solve this problem.
> > >
> > > Thanks!
> > >
> > > I also have the data in a list,
> > >
> > > [ 'VLAN4065',
> > >  'Interface',
> > >  'Gi9/6',
> > >  'Po2',
> > >  'Po3',
> > >  'Po306',
> > >  'VLAN4068',
> > >  'Interface',
> > >  'Gi9/6',
> > >  'VLAN4069',
> > >  'Interface',
> > >  'Gi9/6',]
> >
> >
> >
> > ===================================
> >
> > from itertools import groupby
> >
> > data = \
> > [ {'vlan_or_intf': 'VLAN2021'},
> >  {'vlan_or_intf': 'Interface'},
> >  {'vlan_or_intf': 'Po1'},
> >  {'vlan_or_intf': 'Po306'},
> >  {'vlan_or_intf': 'VLAN2022'},
> >  {'vlan_or_intf': 'Interface'},
> >  {'vlan_or_intf': 'Gi7/33'},
> >  {'vlan_or_intf': 'Po1'},
> >  {'vlan_or_intf': 'Po306'},
> >  {'vlan_or_intf': 'VLAN2051'},
> >  {'vlan_or_intf': 'Interface'},
> >  {'vlan_or_intf': 'Gi9/6'},
> >  {'vlan_or_intf': 'VLAN2052'},
> >  {'vlan_or_intf': 'Interface'},
> >  {'vlan_or_intf': 'Gi9/6'},]
> >
> > def clean_up(lst):
> >       return [d.values()[0] for d in data if d.values()[0] !=
> 'Interface']
> >
> > out = {}
> > for k, g in groupby(clean_up(data) , key=lambda s:
> > s.startswith('VLAN')):
> >       if k:
> >               key = list(g)[0].replace('VLAN','')
> >       else:
> >               out[key] = list(g)
> >
> > print out
> > ===================================
> >
> > hth,
> > L.
>
> Good use of groupby. Here is what I ended up coming up:
>
> from itertools import groupby
> laninfo=[ 'VLAN4065',
>  'Interface',
>  'Gi9/6',
>  'Po2',
>  'Po3',
>  'Po306',
>  'VLAN4068',
>  'Interface',
>  'Gi9/6',
>  'VLAN4069',
>  'Interface',
>  'Gi9/6',]
>
> def splitgrp(s, f=[False]):
>   f[0]^=s.startswith('VLAN')
>   return f[0]
> lanlst=(list(g) for k,g in groupby(laninfo,key=splitgrp))
> out={item[0][4:]:item[2:] for item in lanlst}
> print(out)
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From mrmakent at gmail.com  Thu Mar  4 16:12:01 2010
From: mrmakent at gmail.com (Mike Kent)
Date: Thu, 4 Mar 2010 13:12:01 -0800 (PST)
Subject: A "scopeguard" for Python
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<hmm0rd$a48$1@news.eternal-september.org>
	<mailman.211.1267636174.23598.python-list@python.org> 
	<hmm5ln$arg$1@news.eternal-september.org>
	<mailman.277.1267699818.23598.python-list@python.org> 
	<hmokot$uso$1@news.eternal-september.org>
	<mailman.293.1267718664.23598.python-list@python.org> 
	<hmop33$rrj$1@news.eternal-september.org>
	<mailman.303.1267723835.23598.python-list@python.org>
Message-ID: <6af3c613-3439-484b-83f1-49213f1ed574@k17g2000yqb.googlegroups.com>

On Mar 4, 12:30?pm, Robert Kern <robert.k... at gmail.com> wrote:

> He's ignorant of the use cases of the with: statement, true.

<humor> Ouch!  Ignorant of the use cases of the with statement, am I?
Odd, I use it all the time. </humor>

> Given only your
> example of the with: statement, it is hard to fault him for thinking that try:
> finally: wouldn't suffice.

<humor> Damn me with faint praise, will you? </humor>

I'm kinda amazed at the drama my innocent request for the use case
elicited.  From what I've gotten so far from this thread, for the
actual example Mr. Steinbach used, the only disadvantage to my counter-
example using try/finally is that the chdir in the finally part will
always be executed, even if the chdir in the try part did not
succeed.  I concede that, and was aware of it when I wrote it.  For
the simple example given, I did not consider it compelling.  A more
complex example, that would have required multiple, nested try/finally
blocks, would show the advantages of Mr Steinbach's recipe more
clearly.

However, I fail to understand his response that I must have meant try/
else instead, as this, as Mr. Kern pointed out, is invalid syntax.
Perhaps Mr. Steinbach would like to give an example?


From jjposner at optimum.net  Thu Mar  4 16:17:20 2010
From: jjposner at optimum.net (John Posner)
Date: Thu, 04 Mar 2010 16:17:20 -0500
Subject: Method / Functions - What are the differences?
In-Reply-To: <4B8EF717.3070701@optimum.net>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
	<mailman.109.1267539415.23598.python-list@python.org>
	<hmk1mn$70u$1@newsreader3.netcologne.de>
	<4b8e4041$0$17447$426a34cc@news.free.fr>
	<hmlte9$d0f$1@dough.gmane.org>
	<mailman.205.1267633968.23598.python-list@python.org>
	<4b8e9660$0$21812$426a34cc@news.free.fr>
	<hmmrh4$644$1@newsreader3.netcologne.de>
	<4B8EF717.3070701@optimum.net>
Message-ID: <4b902338$0$31260$607ed4bc@cv.net>

On 3/3/2010 6:56 PM, John Posner wrote:
>
> ... I was thinking
> today about "doing a Bruno", and producing similar pieces on:
>
> * properties created with the @property decorator
>
> * the descriptor protocol
>
> I'll try to produce something over the next couple of days.
>

Starting to think about a writeup on Python properties, I've discovered 
that the official Glossary [1] lacks an entry for "property" -- it's 
missing in both Py2 and Py3!

Here's a somewhat long-winded definition -- comments, please:

---------------------------------------------
An attribute, *a*, of an object, *obj*, is said to be implemented as a 
property if the standard ways of accessing the attribute:

  * evaluation:      print obj.a
  * assignment:      obj.a = 42
  * deletion:        del obj.a

... cause methods of a user-defined *property object* to be invoked. The 
attribute is created as a class attribute, not an instance attribute. 
Example:

   class Widget:
       # create "color" as class attribute, not within __init__()
       color = <<property-object>>

       def __init__(self, ...):
           # do not define "self.color" instance attribute

The property object can be created with the built-in function 
property(), which in some cases can be coded as a decorator: @property. 
The property object can also be an instance of a class that implements 
the descriptor protocol.
---------------------------------------------

Tx,
John

[1]  http://docs.python.org/glossary.html


From mrmakent at gmail.com  Thu Mar  4 16:19:44 2010
From: mrmakent at gmail.com (Mike Kent)
Date: Thu, 4 Mar 2010 13:19:44 -0800 (PST)
Subject: A "scopeguard" for Python
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<mailman.209.1267635630.23598.python-list@python.org>
Message-ID: <cf51c311-7354-4e89-ab2e-45bb8b66d67d@z35g2000yqd.googlegroups.com>

On Mar 3, 12:00?pm, Robert Kern <robert.k... at gmail.com> wrote:
> On 2010-03-03 09:39 AM, Mike Kent wrote:
>
> > What's the compelling use case for this vs. a simple try/finally?
>
> > ? ? original_dir = os.getcwd()
> > ? ? try:
> > ? ? ? ? os.chdir(somewhere)
> > ? ? ? ? # Do other stuff
> > ? ? finally:
> > ? ? ? ? os.chdir(original_dir)
> > ? ? ? ? # Do other cleanup
>
> A custom-written context manager looks nicer and can be more readable.
>
> from contextlib import contextmanager
> import os
>
> @contextmanager
> def pushd(path):
> ? ? ?original_dir = os.getcwd()
> ? ? ?os.chdir(path)
> ? ? ?try:
> ? ? ? ? ?yield
> ? ? ?finally:
> ? ? ? ? ?os.chdir(original_dir)
>
> with pushd(somewhere):
> ? ? ?...

Robert, I like the way you think.  That's a perfect name for that
context manager!  However, you can clear one thing up for me... isn't
the inner try/finally superfluous?  My understanding was that there
was an implicit try/finally already done which will insure that
everything after the yield statement was always executed.


From news123 at free.fr  Thu Mar  4 16:24:59 2010
From: news123 at free.fr (News123)
Date: Thu, 04 Mar 2010 22:24:59 +0100
Subject: _winreg and access registry settings of another user
Message-ID: <4b90252b$0$17806$426a34cc@news.free.fr>

Hi,

I habe administrator privilege  on a window host and would like to write
a script setting some registry entries for other users.




There are potentially at least two wo ways of doing this:

1.) start a subprocess as other user and change the regitrey for
CURRENT_USER

However I don't know how to start a process (or ideally just a thread)
as another user with python.


2.) Load the 'hive' of the othe user and chnage the registry.

It seems, that one has to load the 'hive' of a different user in order
to have access to somebody eleses registry entries.

I did not find any documetnation of how to load a 'hive' wit the library
_winreg or another python library/


Did anybody else try already something similiar?


thanks in advance for pointers



bye


N





From jpiitula at ling.helsinki.fi  Thu Mar  4 16:40:39 2010
From: jpiitula at ling.helsinki.fi (Jussi Piitulainen)
Date: 04 Mar 2010 23:40:39 +0200
Subject: Partly erratic wrong behaviour, Python 3, lxml
References: <qotr5o0xt3l.fsf@ruuvi.it.helsinki.fi>
	<mailman.308.1267729874.23598.python-list@python.org>
Message-ID: <qotlje7ydd4.fsf@ruuvi.it.helsinki.fi>

Stefan Behnel writes:
> Jussi Piitulainen, 04.03.2010 11:46:
> > I am observing weird semi-erratic behaviour that involves Python 3
> > and lxml, is extremely sensitive to changes in the input data, and
> > only occurs when I name a partial result. I would like some help
> > with this, please. (Python 3.1.1; GNU/Linux; how do I find lxml
> > version?)
> 
> Here's how to find the version:
> 
> http://codespeak.net/lxml/FAQ.html#i-think-i-have-found-a-bug-in-lxml-what-should-i-do

Ok, thank you. Here's the results:

>>> print(et.LXML_VERSION, et.LIBXML_VERSION,
...       et.LIBXML_COMPILED_VERSION, et.LIBXSLT_VERSION,
...       et.LIBXSLT_COMPILED_VERSION)
(2, 2, 4, 0) (2, 6, 26) (2, 6, 26) (1, 1, 17) (1, 1, 17)

> I'll give your test code a try when I get to it. However, note that
> the best place to discuss this is the lxml mailing list:
> 
> http://codespeak.net/mailman/listinfo/lxml-dev

Thank you. Two things, however. First, I snipped out most of the XML
document in that post, so it won't be runnable as is. As I think I
said, my attempts to edit it down to size made the bug hide
itself. Second, it's very sensitive to any changes in that XML.

Oh, and a third thing. I'm not at all sure yet that the bug is in
lxml. It seems to me that Python itself does impossible things - I
hope I'm just being blind to something obvious, really.

But if you like to try it out, I'll post the full test data as a
followup to this. It's just bogus test data.


From deets at nospam.web.de  Thu Mar  4 16:43:12 2010
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 04 Mar 2010 22:43:12 +0100
Subject: python SUDS library
In-Reply-To: <28ed0127-8b71-4327-954c-c9100b4768de@v20g2000prb.googlegroups.com>
References: <28ed0127-8b71-4327-954c-c9100b4768de@v20g2000prb.googlegroups.com>
Message-ID: <7vanrgF97hU1@mid.uni-berlin.de>

Am 04.03.10 06:23, schrieb yamamoto:
> Hi,
> I tried to make a simple script with SUD library for caching torrent
> files. it doenst work!
>
> [versions]
> suds: 0.4, python: 2.6.4
>
> [code]
> from suds.client import Client
> import base64
>
> path = 'sample.torrent'
> doc = open(path, 'rb').read()
> encoded_doc = base64.b64encode(doc)
> url = 'http://torrage.com/api/torrage.wsdl'
> client = Client(url, cache=None)
> print client
> hash = client.service.cacheTorrent(encoded_doc)
> print hash
>
> [result]
>
> Suds ( https://fedorahosted.org/suds/ )  version: 0.4 (beta)  build:
> R663-20100303
>
> Service ( CacheService ) tns="urn:Torrage"
>     Prefixes (0)
>     Ports (1):
>        (CachePort)
>           Methods (1):
>              cacheTorrent(xs:string torrent, )
>           Types (0):
>
> Traceback (most recent call last):
>    File "C:\Documents and Settings\yamamoto\workspace\python\console
> \extract.py", line 13, in<module>
>      result = client.service.cacheTorrent(encoded_doc)
>    File "C:\Python26\lib\site-packages\suds\client.py", line 539, in
> __call__
>      return client.invoke(args, kwargs)
>    File "C:\Python26\lib\site-packages\suds\client.py", line 598, in
> invoke
>      result = self.send(msg)
>    File "C:\Python26\lib\site-packages\suds\client.py", line 627, in
> send
>      result = self.succeeded(binding, reply.message)
>    File "C:\Python26\lib\site-packages\suds\client.py", line 659, in
> succeeded
>      r, p = binding.get_reply(self.method, reply)
>    File "C:\Python26\lib\site-packages\suds\bindings\binding.py", line
> 143, in get_reply
>      replyroot = sax.parse(string=reply)
>    File "C:\Python26\lib\site-packages\suds\sax\parser.py", line 136,
> in parse
>      sax.parse(source)
>    File "C:\Python26\lib\xml\sax\expatreader.py", line 107, in parse
>      xmlreader.IncrementalParser.parse(self, source)
>    File "C:\Python26\lib\xml\sax\xmlreader.py", line 123, in parse
>      self.feed(buffer)
>    File "C:\Python26\lib\xml\sax\expatreader.py", line 211, in feed
>      self._err_handler.fatalError(exc)
>    File "C:\Python26\lib\xml\sax\handler.py", line 38, in fatalError
>      raise exception
> xml.sax._exceptions.SAXParseException:<unknown>:2:0: junk after
> document element
>
>
> this is a php code provided by torrage
> <?
>          $client = new SoapClient("http://torrage.com/api/
> torrage.wsdl");
>          $infoHash = $client-
>> cacheTorrent(base64_encode(file_get_contents("my.torrent")));
> ?>
>
> any suggestions?

Looks like the XML is malformed. Can you post it? You can insert 
print-statements into the library to do so, eg in line 143 of 
suds.bindings.binding.

Diez

Diez



From jpiitula at ling.helsinki.fi  Thu Mar  4 16:47:49 2010
From: jpiitula at ling.helsinki.fi (Jussi Piitulainen)
Date: 04 Mar 2010 23:47:49 +0200
Subject: Partly erratic wrong behaviour, Python 3, lxml
References: <qotr5o0xt3l.fsf@ruuvi.it.helsinki.fi>
	<mailman.308.1267729874.23598.python-list@python.org>
	<qotlje7ydd4.fsf@ruuvi.it.helsinki.fi>
Message-ID: <qothbovyd16.fsf@ruuvi.it.helsinki.fi>

This is the full data file on which my regress/Tribug exhibits the
behaviour that I find incomprehensible, described in the first post in
this thread. The comment in the beginning of the file below was
written before I commented out some records in the data, so the actual
numbers now are not ten expected, thirty sometimes observed, but the
wrong number is always the correct number tripled (5 and 15, I think).

---regress/tridata.py follows---
# Exercise lxml.etree.parse(body).xpath(title)
# which I think should always return a list of
# ten elements but sometimes returns thirty,
# with each of the ten in triplicate. And this
# seems impossible to me. Yet I see it happening.

body = b'''<OAI-PMH xmlns="http://www.openarchives.org/OAI/2.0/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/          http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd">
<responseDate>2010-03-02T09:38:47Z</responseDate>
<request verb="ListRecords" from="2004-01-01T00:00:00Z" until="2004-12-31T23:59:59Z" metadataPrefix="oai_dc">http://localhost/pmh/que</request>
<ListRecords>
<record>
<header><!-- x --><!-- -->
   <identifier>jrc32003R0055-pl.xml/2/0</identifier>
   <datestamp>2004-08-15T19:45:00Z</datestamp>
   <setSpec>pl</setSpec>
</header>
<metadata>
   <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc        http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
      <dc:title>Rozporz&#261;dzenie</dc:title>
   </oai_dc:dc>
</metadata>
</record>
<!-- <record>
<header>
   <identifier>jrc32003R0055-pl.xml/2/1</identifier>
   <datestamp>2004-08-15T19:45:00Z</datestamp>
   <setSpec>pl</setSpec>
</header>
<metadata>
   <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc        http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
      <dc:title>Komisji</dc:title>
   </oai_dc:dc>
</metadata>
</record>
<record>
<header>
   <identifier>jrc32003R0055-pl.xml/2/2</identifier>
   <datestamp>2004-08-15T19:45:00Z</datestamp>
   <setSpec>pl</setSpec>
</header>
<metadata>
   <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc        http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
      <dc:title>(WE)</dc:title>
   </oai_dc:dc>
</metadata>
</record>
<record>
<header>
   <identifier>jrc32003R0055-pl.xml/2/3</identifier>
   <datestamp>2004-08-15T19:45:00Z</datestamp>
   <setSpec>pl</setSpec>
</header>
<metadata>
   <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc        http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
      <dc:title>nr</dc:title>
   </oai_dc:dc>
</metadata>
</record>
<record>
<header>
   <identifier>jrc32003R0055-pl.xml/2/4</identifier>
   <datestamp>2004-08-15T19:45:00Z</datestamp>
   <setSpec>pl</setSpec>
</header>
<metadata>
   <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc        http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
      <dc:title>55/2003</dc:title>
   </oai_dc:dc>
</metadata>
</record>
<record>
<header>
   <identifier>jrc32003R0055-pl.xml/3/0</identifier>
   <datestamp>2004-08-15T19:45:00Z</datestamp>
   <setSpec>pl</setSpec>
</header>
<metadata>
   <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc        http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
      <dc:title>z</dc:title>
   </oai_dc:dc>
</metadata>
</record> -->
<record>
<header>
   <identifier>jrc32003R0055-pl.xml/3/1</identifier>
   <datestamp>2004-08-15T19:45:00Z</datestamp>
   <setSpec>pl</setSpec>
</header>
<metadata>
   <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc        http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
      <dc:title>dnia</dc:title>
   </oai_dc:dc>
</metadata>
</record>
<record>
<header>
   <identifier>jrc32003R0055-pl.xml/3/2</identifier>
   <datestamp>2004-08-15T19:45:00Z</datestamp>
   <setSpec>pl</setSpec>
</header>
<metadata>
   <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc        http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
      <dc:title>13</dc:title>
   </oai_dc:dc>
</metadata>
</record>
<record>
<header>
   <identifier>jrc32003R0055-pl.xml/3/3</identifier>
   <datestamp>2004-08-15T19:45:00Z</datestamp>
   <setSpec>pl</setSpec>
</header>
<metadata>
   <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc        http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
      <dc:title>stycznia</dc:title>
   </oai_dc:dc>
</metadata>
</record>
<record>
<header>
   <identifier>jrc32003R0055-pl.xml/3/4</identifier>
   <datestamp>2004-08-15T19:45:00Z</datestamp>
   <setSpec>pl</setSpec>
</header>
<metadata>
   <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc        http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
      <dc:title>2003</dc:title>
   </oai_dc:dc>
</metadata>
</record>
</ListRecords>
</OAI-PMH>
'''

title = '//*[name()="record"]//*[name()="dc:title"]'


From jgardner at jonathangardner.net  Thu Mar  4 16:54:45 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Thu, 4 Mar 2010 13:54:45 -0800
Subject: Evaluate my first python script, please
In-Reply-To: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
Message-ID: <6cc20cea1003041354s3cb5011cmbbaf39eefed7a4e4@mail.gmail.com>

On Thu, Mar 4, 2010 at 10:39 AM, Pete Emerson <pemerson at gmail.com> wrote:
>
> #!/usr/bin/python
>

More common:

#!/usr/bin/env python

> import sys, fileinput, re, os
>
> filename = '/etc/hosts'
>
> hosts = []
>
> for line in open(filename, 'r'):
> ? ? ? ?match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line)
> ? ? ? ?if match is None or re.search('^(?:float|localhost)\.', line):
> continue
> ? ? ? ?hostname = match.group(1)

In Python, we use REs as a last resort. See "dir("")" or "help("")"
for why we don't use REs if we can avoid them.

The above is better represented with:

try:
  ipaddr, hostnames = line.split(None, 1)
except IndexError:
  continue

if line.find('float') >=0 or line.find('localhost') >= 0:
  continue


> ? ? ? ?count = 0
> ? ? ? ?for arg in sys.argv[1:]:
> ? ? ? ? ? ? ? ?for section in hostname.split('.'):
> ? ? ? ? ? ? ? ? ? ? ? ?if section == arg:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?count = count + 1
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?break
> ? ? ? ?if count == len(sys.argv) - 1:
> ? ? ? ? ? ? ? ?hosts.append(hostname)
>

You can use the "else" in a "for". as well.

for arg in sys.argv[1:]:
         for section in hostname.split('.'):
                 if section == arg:
                         break
else: # Run only if for completes naturally
          hosts.append(hostname)


It may be clearer to do set arithmetic as well.

> if len(hosts) == 1:
> ? ? ? ?os.system("ssh -A " + hosts[0])

You probably want one of the os.exec* methods instead, since you
aren't going to do anything after this.

> else:
> ? ? ? ?print '\n'.join(hosts)

Rather, the idiom is usually:

for host in hosts:
  print host

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From mensanator at aol.com  Thu Mar  4 17:21:16 2010
From: mensanator at aol.com (Mensanator)
Date: Thu, 4 Mar 2010 14:21:16 -0800 (PST)
Subject: _winreg and access registry settings of another user
References: <4b90252b$0$17806$426a34cc@news.free.fr>
Message-ID: <917f4593-f50e-424c-a21b-04c376e77164@33g2000yqj.googlegroups.com>

On Mar 4, 3:24?pm, News123 <news... at free.fr> wrote:
> Hi,
>
> I habe administrator privilege ?on a window host and would like to write
> a script setting some registry entries for other users.

Why? Are you writing a virus?

>
> There are potentially at least two wo ways of doing this:
>
> 1.) start a subprocess as other user and change the regitrey for
> CURRENT_USER
>
> However I don't know how to start a process (or ideally just a thread)
> as another user with python.
>
> 2.) Load the 'hive' of the othe user and chnage the registry.
>
> It seems, that one has to load the 'hive' of a different user in order
> to have access to somebody eleses registry entries.
>
> I did not find any documetnation of how to load a 'hive' wit the library
> _winreg or another python library/
>
> Did anybody else try already something similiar?
>
> thanks in advance for pointers
>
> bye
>
> N



From fabiofz at gmail.com  Thu Mar  4 17:25:20 2010
From: fabiofz at gmail.com (Fabio Zadrozny)
Date: Thu, 4 Mar 2010 19:25:20 -0300
Subject: Pydev 1.5.5 Released
Message-ID: <cfb578b21003041425v1fbe077x7cf8abaeb46ea1d9@mail.gmail.com>

Hi All,

Pydev 1.5.5 has been released

Details on Pydev: http://pydev.org
Details on its development: http://pydev.blogspot.com

Release Highlights:
-------------------------------

* Predefined completions available for code completion:

    * Predefined completions may be created for use when sources are
not available
    * Can also be used for providing better completions for compiled
modules (e.g.: PyQt, wx, etc.)
    * Defined in .pypredef files (which are plain Python code)
    * Provides a way for generating those from a QScintilla .api file
(experimental)
    * See Predefined Completions in manual for more info

* Pydev Package Explorer:

    * Showing the contents of the PYTHONPATH from the interpreter for
each project
    * Shows the folder containing the python interpreter executable
(to browse for docs, scripts, etc)
    * Allows opening files in the interpreter PYTHONPATH (even inside zip files)

* Editor options:

    * Find/replace dialog has option to search in currently opened editors
    * Move line up/down can move considering Python indentation (not default)
    * Simple token completions can have a space or a space and colon
added when applied. E.g.: print, if, etc (not default)

* Refactoring:

    * Fixed InvalidThreadAccess on refactoring
    * Fixed problem doing refactoring on external files (no file was found)

* Globals Browser (Ctrl+Shift+T):

    * No longer throwing NullPointerException when the interpreter is
no longer available for a previously found token

* General:

    * When creating a new pydev project, the user will be asked before
changing to the pydev perspective
    * Only files under source folders are analyzed (files in the
external source folders would be analyzed if they happened to be in
the Eclipse workspace)
    * Interactive console now works properly on non-english systems
    * Hover working over tokens from compiled modules (e.g.: file,
file.readlines)
    * JYTHONPATH environment variable is set on Jython (previously
only the PYTHONPATH was set)
    * Fixed path translation issues when using remote debugger
    * Fixed issue finding definition for a method of a locally created token




What is PyDev?
---------------------------

PyDev is a plugin that enables users to use Eclipse for Python, Jython
and IronPython development -- making Eclipse a first class Python IDE
-- It comes with many goodies such as code completion, syntax
highlighting, syntax analysis, refactor, debug and many others.


Cheers,

-- 
Fabio Zadrozny
------------------------------------------------------
Software Developer

Aptana
http://aptana.com/python

Pydev - Python Development Environment for Eclipse
http://pydev.org
http://pydev.blogspot.com


From alfps at start.no  Thu Mar  4 17:27:03 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Thu, 04 Mar 2010 23:27:03 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <6af3c613-3439-484b-83f1-49213f1ed574@k17g2000yqb.googlegroups.com>
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<hmm0rd$a48$1@news.eternal-september.org>
	<mailman.211.1267636174.23598.python-list@python.org>
	<hmm5ln$arg$1@news.eternal-september.org>
	<mailman.277.1267699818.23598.python-list@python.org>
	<hmokot$uso$1@news.eternal-september.org>
	<mailman.293.1267718664.23598.python-list@python.org>
	<hmop33$rrj$1@news.eternal-september.org>
	<mailman.303.1267723835.23598.python-list@python.org>
	<6af3c613-3439-484b-83f1-49213f1ed574@k17g2000yqb.googlegroups.com>
Message-ID: <hmpc3r$2il$1@news.eternal-september.org>

* Mike Kent:
> On Mar 4, 12:30 pm, Robert Kern <robert.k... at gmail.com> wrote:
> 
>> He's ignorant of the use cases of the with: statement, true.
> 
> <humor> Ouch!  Ignorant of the use cases of the with statement, am I?
> Odd, I use it all the time. </humor>
> 
>> Given only your
>> example of the with: statement, it is hard to fault him for thinking that try:
>> finally: wouldn't suffice.
> 
> <humor> Damn me with faint praise, will you? </humor>
> 
> I'm kinda amazed at the drama my innocent request for the use case
> elicited.  From what I've gotten so far from this thread, for the
> actual example Mr. Steinbach used, the only disadvantage to my counter-
> example using try/finally is that the chdir in the finally part will
> always be executed, even if the chdir in the try part did not
> succeed.  I concede that, and was aware of it when I wrote it.  For
> the simple example given, I did not consider it compelling.

Uhm, well.

My example was:

   with Cleanup as at_cleanup:
       # blah blah
       chdir( somewhere )
       at_cleanup.call( lambda: chdir( original_dir ) )
       # blah blah

It was not intended to compel, rather just to illustrate usage. :-)

And you asked about comparing that with ...

    original_dir = os.getcwd()
    try:
        os.chdir(somewhere)
        # Do other stuff
    finally:
        os.chdir(original_dir)
        # Do other cleanup

.. which does something different, namely, always executing the 
os.chdir(original_dir) or more generally the action-specific cleanup.

The action-specific cleanup might be much more costly than a chdir, and/or, in 
the case where the action failed, incorrect.

In the same number of lines and with fewer keystrokes you could have written 
code that was equivalent to the code I posted and that you wanted to compare 
with, e.g. ...

    original_dir = os.getcwd()
    os.chdir(somewhere)
    try:
        # Do other stuff
    finally:
        os.chdir(original_dir)
        # Do other cleanup

... so given how easy it is to write such an equivalent code snippet, I assumed 
that the different behavior was /not/ intended, that instead, you'd attempted to 
write equivalent code but made a slight error in the translation to lower level 
construct  --  but impossible to say exactly what.

Now you write that you were "aware of [the different behavior] when I wrote it", 
and that just baffles me: why not then, as a basis of sound comparision, write 
the equivalent code shown above, the same number of lines as what you wrote?


>  A more
> complex example, that would have required multiple, nested try/finally
> blocks, would show the advantages of Mr Steinbach's recipe more
> clearly.
> 
> However, I fail to understand his response that I must have meant try/
> else instead, as this, as Mr. Kern pointed out, is invalid syntax.
> Perhaps Mr. Steinbach would like to give an example?

OK.

Assuming that you wanted the chdir to be within a try block (which it was in 
your code), then to get code equivalent to my code, for the purpose of a 
comparision of codes that do the same, you'd have to write something like ...

    original_dir = os.getcwd()
    try:
        os.chdir(somewhere)
    except Whatever:
        # E.g. log it.
        raise
    else:
        try:
            # Do other stuff
        finally:
            os.chdir(original_dir)
            # Do other cleanup

... which would be a more general case.

I've also given this example in response to Robert earlier in the thread. 
Although I haven't tried it I believe it's syntactically valid. If not, then the 
relevant typo should just be fixed. :-)

I have no idea which construct Robert thought was syntactically invalid. I think 
that if he's written that, then it must have been something he thought of.


Cheers & hth.,

- Alf


From sjdevnull at yahoo.com  Thu Mar  4 17:55:07 2010
From: sjdevnull at yahoo.com (sjdevnull at yahoo.com)
Date: Thu, 4 Mar 2010 14:55:07 -0800 (PST)
Subject: Evaluate my first python script, please
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
Message-ID: <692c83be-0075-470f-a970-8e5c5c301eb0@g7g2000yqe.googlegroups.com>

On Mar 4, 1:39?pm, Pete Emerson <pemer... at gmail.com> wrote:
> I've written my first python program, and would love suggestions for
> improvement.
>
> I'm a perl programmer and used a perl version of this program to guide
> me. So in that sense, the python is "perlesque"
>
> This script parses /etc/hosts for hostnames, and based on terms given
> on the command line (argv), either prints the list of hostnames that
> match all the criteria, or uses ssh to connect to the host if the
> number of matches is unique.
>
> I am looking for advice along the lines of "an easier way to do this"
> or "a more python way" (I'm sure that's asking for trouble!) or
> "people commonly do this instead" or "here's a slick trick" or "oh,
> interesting, here's my version to do the same thing".
>
> I am aware that there are performance improvements and error checking
> that could be made, such as making sure the file exists and is
> readable and precompiling the regular expressions and not calculating
> how many sys.argv arguments there are more than once. I'm not hyper
> concerned with performance or idiot proofing for this particular
> script.
>
> Thanks in advance.
>
> ########################################################
> #!/usr/bin/python
>
> import sys, fileinput, re, os

'Some people, when confronted with a problem, think "I know, I?ll use
regular expressions." Now they have two problems.' ? Jamie Zawinski

Seriously, regexes can be very useful but there's no need for them
here.  Simpler is usually better, and easier to understand.

> filename = '/etc/hosts'
>
> hosts = []
>
> for line in open(filename, 'r'):
> ? ? ? ? match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line)
> ? ? ? ? if match is None or re.search('^(?:float|localhost)\.', line):
> continue
> ? ? ? ? hostname = match.group(1)

I find this much clearer without regexes:

try:
    ip, hostname = line.strip().split(None, 1)
except IndexError:
    continue
# I think this is equivalent to your re, but I'm not sure it's what
# you actually meant...
#if line.startswith("float.") or line.startswith("localhost."):
#    continue
# I'm going with:
if hostname.startswith("float.") or hostname.startswith("localhost"):
    continue


> ? ? ? ? count = 0
> ? ? ? ? for arg in sys.argv[1:]:
> ? ? ? ? ? ? ? ? for section in hostname.split('.'):
> ? ? ? ? ? ? ? ? ? ? ? ? if section == arg:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? count = count + 1
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? break
> ? ? ? ? if count == len(sys.argv) - 1:
> ? ? ? ? ? ? ? ? hosts.append(hostname)

A perfect application of sets.

#initialize at program outset
args = set(sys.argv[1:])
...
hostparts = set(hostname.split("."))
if hostparts & args:
    hosts.append(hostname)


Full program:

import sys
import os
filename = '/etc/hosts'

hosts = []
args = set(sys.argv[1:])
for line in open(filename, 'r'):
    # Parse line into ip address and hostname, skipping bogus lines
    try:
        ipaddr, hostname = line.strip().split(None, 1)
    except ValueError:
        continue
    if hostname.startswith("float.") or
hostname.startswith("localhost."):
            continue

    # Add to hosts if it matches at least one argument
    hostparts = set(hostname.split("."))
    if hostparts & args:
        hosts.append(hostname)

# If there's only one match, ssh to it--otherwise print out the
matches
if len(hosts) == 1:
    os.system("ssh -A %s"%hosts[0])
else:
    for host in hosts:
        print host


From python at bdurham.com  Thu Mar  4 18:10:06 2010
From: python at bdurham.com (python at bdurham.com)
Date: Thu, 04 Mar 2010 18:10:06 -0500
Subject: Looking for the mysterious zlib.py* files in Python 2.6.4 (32-bit) for
	Windows
In-Reply-To: <1267743672.16774.1363182565@webmail.messagingengine.com>
References: <1267743672.16774.1363182565@webmail.messagingengine.com>
Message-ID: <1267744206.18232.1363186281@webmail.messagingengine.com>

In the process of building an EXE with py2exe, I noticed that
there's no physical zlib files anywhere on my workstation.

I can import zlib and use this module's features without problem.
But when I query zlib.__file__, I get back an empty string.

Where does the zlib code live? Is zlib a <built-in> in 2.6?

The reason I question its '<built-in>' status is that when
analyzing my 2.6 based Py2exe produced executables with
DependencyWalker, I see references to a zlib.pyd file that
doesn't exist anywhere on my system. I wonder if this is
something I should be concerned about?

Can someone explain this mystery to me?

Thank you,
Malcolm


From alfps at start.no  Thu Mar  4 18:52:04 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Fri, 05 Mar 2010 00:52:04 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.314.1267744631.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>	<hmn03d$5r6$1@news.eternal-september.org>	<mailman.292.1267717742.23598.python-list@python.org>	<hmooo6$pg0$1@news.eternal-september.org>	<mailman.300.1267723245.23598.python-list@python.org>	<hmoul7$2i9$1@news.eternal-september.org>
	<mailman.314.1267744631.23598.python-list@python.org>
Message-ID: <hmph3b$20o$1@news.eternal-september.org>

* Robert Kern:
> On 2010-03-04 12:37 PM, Alf P. Steinbach wrote:
>> * Robert Kern:
>>> On 2010-03-04 10:56 AM, Alf P. Steinbach wrote:
>>>> * Robert Kern:
>>>>> On 2010-03-03 18:49 PM, Alf P. Steinbach wrote:
>> [snippety]
>>>>>
>>>>>> If you call the possibly failing operation "A", then that systematic
>>>>>> approach goes like this: if A fails, then it has cleaned up its own
>>>>>> mess, but if A succeeds, then it's the responsibility of the calling
>>>>>> code to clean up if the higher level (multiple statements) operation
>>>>>> that A is embedded in, fails.
>>>>>>
>>>>>> And that's what Marginean's original C++ ScopeGuard was designed for,
>>>>>> and what the corresponding Python Cleanup class is designed for.
>>>>>
>>>>> And try: finally:, for that matter.
>>>>
>>>> Not to mention "with".
>>>>
>>>> Some other poster made the same error recently in this thread; it is a
>>>> common fallacy in discussions about programming, to assume that since
>>>> the same can be expressed using lower level constructs, those are all
>>>> that are required.
>>>>
>>>> If adopted as true it ultimately means the removal of all control
>>>> structures above the level of "if" and "goto" (except Python doesn't
>>>> have "goto").
>>>
>>> What I'm trying to explain is that the with: statement has a use even
>>> if Cleanup doesn't. Arguing that Cleanup doesn't improve on try:
>>> finally: does not mean that the with: statement doesn't improve on
>>> try: finally:.
>>
>> That's a different argument, essentially that you see no advantage for
>> your current coding patterns.
>>
>> It's unconnected to the argument I responded to.
>>
>> The argument that I responded to, that the possibility of expressing
>> things at the level of try:finally: means that a higher level construct
>> is superfluous, is still meaningless.
> 
> I am attacking your premise that the "with Cleanup():" construct is 
> higher level than try: finally:. It isn't. It provides the same level of 
> abstraction as try: finally:.
> 
> This is distinct from the accepted uses of the with: statement which 
> *are* higher level than try: finally: and which do confer practical 
> benefits over using try: finally: despite being syntactical sugar for 
> try: finally:.
> 
>>>>>>> Both formulations can be correct (and both work perfectly fine with
>>>>>>> the chdir() example being used). Sometimes one is better than the
>>>>>>> other, and sometimes not. You can achieve both ways with either your
>>>>>>> Cleanup class or with try: finally:.
>>>>>>>
>>>>>>> I am still of the opinion that Cleanup is not an improvement over
>>>>>>> try:
>>>>>>> finally: and has the significant ugliness of forcing cleanup code
>>>>>>> into
>>>>>>> callables. This significantly limits what you can do in your cleanup
>>>>>>> code.
>>>>>>
>>>>>> Uhm, not really. :-) As I see it.
>>>>>
>>>>> Well, not being able to affect the namespace is a significant
>>>>> limitation. Sometimes you need to delete objects from the namespace in
>>>>> order to ensure that their refcounts go to zero and their cleanup code
>>>>> gets executed.
>>>>
>>>> Just a nit (I agree that a lambda can't do this, but as to what's
>>>> required): assigning None is sufficient for that[1].
>>>
>>> Yes, but no callable is going to allow you to assign None to names in
>>> that namespace, either. Not without sys._getframe() hackery, in any 
>>> case.
>>>
>>>> However, note that the current language doesn't guarantee such cleanup,
>>>> at least as far as I know.
>>>>
>>>> So while it's good practice to support it, to do everything to let it
>>>> happen, it's presumably bad practice to rely on it happening.
>>>>
>>>>
>>>>> Tracebacks will keep the namespace alive and all objects in it.
>>>>
>>>> Thanks!, I hadn't thought of connecting that to general cleanup 
>>>> actions.
>>>>
>>>> It limits the use of general "with" in the same way.
>>>
>>> Not really.
>>
>> Sorry, it limits general 'with' in /exactly/ the same way.
>>
>>> It's easy to write context managers that do that [delete objects from
>>> the namespace].
>>
>> Sorry, no can do, as far as I know; your following example quoted below
>> is an example of /something else/.
> 
> Okay, so what do you mean by 'the use of general "with"'? I'm talking 
> about writing a context manager or using the @contextmanager decorator 
> to do some initialization and then later cleaning up that 
> initialization. That cleaning up may entail deleting an object. You are 
> correct that the context manager can't affect the namespace of the with: 
> clause, but that's not the initialization that it would need to clean up.
> 
> Yes, you can write code with a with: statement where you try to clean up 
> stuff that happened inside of the clause (you did), but that's not how 
> the with: statement was ever intended to be used nor is it good practice 
> to do so because of that limitation. Context managers are designed to 
> initialize specific things, then clean them up. I thought you were 
> talking about the uses of the with: statement as described in PEP-343, 
> not every possible misuse of the with: statement.

I'm not the one talking about removing variables or that "it's easy to write 
context managers that do that".

You are the one talking about that.

So I have really not much to add.

It seems that you're now agreeing with me that former is not good practice and 
that the latter is impossible to do portably, but you now argue against your 
earlier stand as if that was something that I had put forward.

It's a bit confusing when you argue against your own statements.


>> And adding on top of irrelevancy, for the pure technical aspect it can
>> be accomplished in the same way using Cleanup (I provide an example 
>> below).
>>
>> However, doing that would generally be worse than pointless since with
>> good coding practices the objects would become unreferenced anyway.
>>
>>
>>> You put the initialization code in the __enter__() method, assign
>>> whatever objects you want to keep around through the with: clause as
>>> attributes on the manager, then delete those attributes in the
>>> __exit__().
>>
>> Analogously, if one were to do this thing, then it could be accomplished
>> using a Cleanup context manager as follows:
>>
>> foo = lambda: None
>> foo.x = create_some_object()
>> at_cleanup.call( lambda o = foo: delattr( o, "x" ) )
>>
>> ... except that
>>
>> 1) for a once-only case this is less code :-)
> 
> Not compared to a try: finally:, it isn't.

Again, this context shifting is bewildering. As you can see, quoted above, you 
were talking about a situation where you would have defined a context manager, 
presumably because a 'try' would not in your opinion be simpler for whatever it 
was that you had in mind. But you are responding to the code I offered as if it 
was an alternative to something where you would find a 'try' to be simplest.


>> 2) it is a usage that I wouldn't recommend; instead I recommend adopting
>> good
>> coding practices where object references aren't kept around.
> 
> Many of the use cases of the with: statement involve creating an object 
> (like a lock or a transaction object), keeping it around for the 
> duration of the "# Do stuff" block, and then finalizing it.
> 
>>> Or, you use the @contextmanager decorator to turn a generator into a
>>> context manager, and you just assign to local variables and del them
>>> in the finally: clause.
>>
>> Uhm, you don't need a 'finally' clause when you define a context manager.
> 
> When you use the @contextmanager decorator, you almost always do. See 
> the Examples section of PEP 343:
> 
>   http://www.python.org/dev/peps/pep-0343/
> 
>> Additionally, you don't need to 'del' the local variables in
>> @contextmanager decorated generator.
>>
>> The local variables cease to exist automatically.
> 
> True.
> 
>>> What you can't do is write a generic context manager where the
>>> initialization happens inside the with: clause and the cleanup actions
>>> are registered callables. That does not allow you to affect the
>>> namespace.
>>
>> If you mean that you can't introduce direct local variables and have
>> them deleted by "registered callables" in a portable way, then right.
>>
>> But I can't think of any example where that would be relevant; in
>> particular what matters for supporting on-destruction cleanup is whether
>> you keep any references or not, not whether you have a local variable of
>> any given name.
> 
> Well, local variables keep references to objects. Variable assignment 
> followed by deletion is a very readable way to keep an object around for 
> a while then remove it later. If you have to go through less readable 
> contortions to keep the object around when it needs to be and clean it 
> up later, then that is a mark against your approach.

Sorry, as with the places noted above, I can't understand what you're trying to 
say here. I don't recommend coding practices where you keep object references 
around, and you have twice quoted that above. I don't have any clue what 
"contortions" you are talking about, it must be something that you imagine.


Cheers,

- Alf (three times baffled)


From mentifex at myuw.net  Thu Mar  4 18:52:36 2010
From: mentifex at myuw.net (Forthminder)
Date: Thu, 4 Mar 2010 15:52:36 -0800 (PST)
Subject: Google AI Challenge at U of Waterloo
References: <4152d196-6491-446b-bc69-5bf54109b354@k5g2000pra.googlegroups.com>
	<hkiqj0$dpj$1@news.eternal-september.org>
	<f1df3934-4604-49a1-bf11-7f3c885e10b1@q16g2000yqq.googlegroups.com>
	<hkjrm3$gt1$1@news.eternal-september.org>
Message-ID: <5b3da248-0ccb-4451-a322-0fcabe744b41@k5g2000pra.googlegroups.com>

Google AI Challenge post-mortem report by the winner is at

http://a1k0n.net/blah/archives/2010/03/index.html#e2010-03-04T14_00_21.txt

Mentifex
--
http://cyborg.blogspot.com
http://code.google.com/p/mindforth/wiki/AiHasBeenSolved


From pengyu.ut at gmail.com  Thu Mar  4 18:57:35 2010
From: pengyu.ut at gmail.com (Peng Yu)
Date: Thu, 4 Mar 2010 15:57:35 -0800 (PST)
Subject: highlight words by regex in pdf files using python
Message-ID: <af0830ae-1d24-4db9-b721-d6602fedd540@15g2000yqi.googlegroups.com>

I don't find a general pdf library in python that can do any
operations on pdfs.

I want to automatically highlight certain words (using regex) in a
pdf. Could somebody let me know if there is a tool to do so in python?


From pemerson at gmail.com  Thu Mar  4 18:59:58 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Thu, 4 Mar 2010 15:59:58 -0800 (PST)
Subject: Evaluate my first python script, please
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
	<692c83be-0075-470f-a970-8e5c5c301eb0@g7g2000yqe.googlegroups.com>
Message-ID: <fa344e19-c699-4ec5-9b44-f2aa47b818cd@k2g2000pro.googlegroups.com>

Great responses, thank you all very much. I read Jonathan Gardner's
solution first and investigated sets. It's clearly superior to my
first cut.

I love the comment about regular expressions. In perl, I've reached
for regexes WAY too much. That's a big lesson learned too, and from my
point of view not because of performance (although that's most likely
a bonus) but because of code readability.

Here's the version I have now. It looks quite similar to sjdevnull's.
Further comments appreciated, and thanks again.

#!/usr/bin/env python

import sys, fileinput, os

filename = '/etc/hosts'

hosts = []

search_terms = set(sys.argv[1:])

for line in open(filename, 'r'):
	if line.startswith('#'): continue
	try:
		hostname = line.strip().split('\t')[2]			# The host I want is always
at the 3rd tab.
	except IndexError:
		continue
	if hostname.startswith('float.') or
hostname.startswith('localhost.'):
		continue
	if search_terms <= set(hostname.split('.')):      # same as if
search_terms.issubset(hostname.split('.')):
		hosts.append(hostname)

if len(hosts) == 1:
	os.execl("/usr/bin/ssh", '-A', hosts[0])
else:
	for host in hosts:
		print host



From nobody at nowhere.com  Thu Mar  4 19:05:10 2010
From: nobody at nowhere.com (Nobody)
Date: Fri, 05 Mar 2010 00:05:10 +0000
Subject: Challenge: escape from the pysandbox
References: <201002261329.33740.victor.stinner@haypocalc.com>
	<hmeamq$a0$1@panix5.panix.com>
	<fbe2e2101002281440n419fbcb1v2cf3922db1cef6a4@mail.gmail.com>
	<mailman.159.1267583850.23598.python-list@python.org>
Message-ID: <pan.2010.03.05.00.04.47.422000@nowhere.com>

On Wed, 03 Mar 2010 03:37:44 +0100, Victor Stinner wrote:

>> I see, makes perfect sense. This then raises the question whether it's
>> important to have a 100% fool proof python sandbox without help from
>> the OS, or this goal is not only too ambitious but also not really a
>> useful one. 
> 
> This is just impossible :-) PHP tried that but it's too hard to write an 
> exhaustive blacklist because too much code have to be modified. If you
> require a 100% fool proof sandbox, you have to use a sandbox between the
> Python process and the OS (and not inside the Python process).

It's entirely feasible to implement a perfect sandbox at the language
level. But you have to design this in from the beginning. If you try to
retro-fit it, you end up either failing or with an entirely different
language.

A black-list approach won't work; you have to deny by default then
white-list "safe" functionality.



From nobody at nowhere.com  Thu Mar  4 19:09:39 2010
From: nobody at nowhere.com (Nobody)
Date: Fri, 05 Mar 2010 00:09:39 +0000
Subject: using subprocess.Popen  env parameter
References: <47f5881a-a7bd-4a57-8e2d-ae27cfbf3a9a@x22g2000yqx.googlegroups.com>
Message-ID: <pan.2010.03.05.00.09.17.266000@nowhere.com>

On Wed, 03 Mar 2010 09:05:47 -0800, enda man wrote:

> cl_path = ms_vc_path + '\VC\bin'

The backslash is used as an escape character within string literals.
Either use raw strings:

	cl_path = ms_vc_path + r'\VC\bin'

or escape the backslashes:

	cl_path = ms_vc_path + '\\VC\\bin'

or use os.path.join():

	cl_path = os.path.join(ms_vc_path, 'VC', 'bin')



From strombrg at gmail.com  Thu Mar  4 19:25:30 2010
From: strombrg at gmail.com (Dan Stromberg)
Date: Thu, 4 Mar 2010 16:25:30 -0800 (PST)
Subject: Fast GUI pipemeter: gprog
References: <619ab895-87a9-4b40-b45e-b12299304b38@z1g2000prc.googlegroups.com>
	<1686070.lZ2vcFHjTE@xkzjympik>
Message-ID: <c2936c0c-fb6c-4666-a140-977179692e0a@x1g2000prb.googlegroups.com>

On Mar 4, 1:15?pm, pk <p... at pk.invalid> wrote:
> Dan Stromberg wrote:
> > In case you're interested, I've put a fast GUI pipemeter (measures how
> > fast data is moving through a pipe or redirect and gives two estimates
> > of time-to-completion - one based on the entire transfer so far, and
> > one based on a user-specifiable number of blocks) up at:
>
> >http://stromberg.dnsalias.org/~dstromberg/gprog/
>
> > It uses a dual process design (to make things a bit faster on dual
> > core or better systems) with a cache oblivious algorithm (to self-tune
> > block sizes for good performance) - I've seen it sustain over 2
> > gigabits/second, and that despite Linux' /dev/zero insisting on a tiny
> > blocksize. ?I wasn't able to construct a RAM disk large enough to get
> > anything like a sustained result with larger blocksizes than what
> > Linux' /dev/zero likes - that is, not without springing for a new
> > machine with a huge amount of RAM. ?IOW, your disk or network will
> > very likely be the bottleneck, not the tool.
>
> > I hope it helps someone.
>
> This sounds similar to "pv", although pv does not have a GUI.

Um, yes, pv is similar and has a pretty nice character cell GUI as it
were.  I suppose I'd neglected to mention that I put a list of similar
tools at the beginning of the gprog page, including pv.

Thanks for making sure we were aware of pv.

Interesting that pv seems to be successfully getting 128K blocks out
of /dev/zero.  For some reason, gprog always gets back 16K blocks
from /dev/zero, even when requesting blocks of sizes substantially
larger.  gprog automatically detects this and just starts asking for
16K.

Python folk: Any guesses why a simple file.read(blocksize) would have
such an affinity for returning 16K when redirected from /dev/zero?  If
I run the program against a file on disk, it gets larger blocksizes
fine.






From hwmeder at alumni.unc.edu  Thu Mar  4 19:45:47 2010
From: hwmeder at alumni.unc.edu (Harold Meder)
Date: Thu, 4 Mar 2010 19:45:47 -0500
Subject: Python Opportunity at OPNET
Message-ID: <3a102d3b1003041645o54bb6823k7f3c66ab3c49eaef@mail.gmail.com>

I stumbled across this Job
Posting<https://enterprise1.opnet.com/recruiting/positions/show_job/4836>at
OPNET.
I hope that it is acceptable to post this type of info on this mailing list.
I do not know any further information regarding this opportunity.

   Harold Meder.
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From electriclightheads at gmail.com  Thu Mar  4 19:48:19 2010
From: electriclightheads at gmail.com ('2+)
Date: Fri, 5 Mar 2010 09:48:19 +0900
Subject: pyao makes the right sound but why?
In-Reply-To: <vg3k4tskjw8.fsf@pepper.modeemi.cs.tut.fi>
References: <mailman.192.1267627812.23598.python-list@python.org>
	<vg3k4tskjw8.fsf@pepper.modeemi.cs.tut.fi>
Message-ID: <1078018b1003041648v1060ddd6ibc482b22ab4c0b2d@mail.gmail.com>

omg! u r actually testin my dirty code?!
tnx that's great!
to create an instance
soy.py depends on(needs all of em):

http://sarigama.namaste.jp/oil/tit01.wav
http://sarigama.namaste.jp/oil/tit02.wav
http://sarigama.namaste.jp/oil/tit03.wav
http://sarigama.namaste.jp/oil/tit04.wav
http://sarigama.namaste.jp/oil/tit05.wav
http://sarigama.namaste.jp/oil/tit06.wav
http://sarigama.namaste.jp/oil/tit07.wav

and the easiest way to get the pattern is instance.pattern(howmanyframes)
the object updates itself with .sing()
and can affect each other with .jam_with(other_instance)

this design is to (in the future) create somethang together
with someone who would upload a short.wav on his site (to contrubute
.. or maybe without willin to ;))
have to study urllib(?) for things to come
have to experiment more with picklin aspects too
but this is my attempt to beat the
"listenin to mp3s" culture

btw. where's that help(ao)?

On Fri, Mar 5, 2010 at 3:43 AM, Anssi Saari <as at sci.fi> wrote:
> "'2+" <electriclightheads at gmail.com> writes:
>
>> dev = ao.AudioDevice('alsa')
>> dev.play(x)
>>
>> could launch me a semi realtime dj kinda sys
>> luckily .. it does seem to be making the right sound
>> but why?
>> the default of the samplerate and that 16bit happened to match with my thing x?
>
> Yes, that seems to be the case from help(ao). But I couldn't run
> tofu = soy.Bean() since it seems to want tit01.wav. Do you make that
> available somewhere?
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
SaRiGaMa's Oil Vending Orchestra
is podcasting:
http://sarigama.namaste.jp/podcast/rss.xml


From howe.steven at gmail.com  Thu Mar  4 19:55:24 2010
From: howe.steven at gmail.com (Steven Howe)
Date: Thu, 04 Mar 2010 16:55:24 -0800
Subject: Python Opportunity at OPNET
In-Reply-To: <3a102d3b1003041645o54bb6823k7f3c66ab3c49eaef@mail.gmail.com>
References: <3a102d3b1003041645o54bb6823k7f3c66ab3c49eaef@mail.gmail.com>
Message-ID: <4B90567C.7010305@gmail.com>

On 03/04/2010 04:45 PM, Harold Meder wrote:
> I stumbled across this Job Posting 
> <https://enterprise1.opnet.com/recruiting/positions/show_job/4836> at 
> OPNET.
> I hope that it is acceptable to post this type of info on this mailing 
> list.
> I do not know any further information regarding this opportunity.
>
>    Harold Meder.
Harold,
Thats just a net looking to scoop up people. There's no job there. Just 
a staffing house looking for resumes in expectation for the job market 
to pickup. Staffing houses rip tech people off.

sph




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From electriclightheads at gmail.com  Thu Mar  4 19:58:14 2010
From: electriclightheads at gmail.com ('2+)
Date: Fri, 5 Mar 2010 09:58:14 +0900
Subject: pyao makes the right sound but why?
In-Reply-To: <1078018b1003041648v1060ddd6ibc482b22ab4c0b2d@mail.gmail.com>
References: <mailman.192.1267627812.23598.python-list@python.org>
	<vg3k4tskjw8.fsf@pepper.modeemi.cs.tut.fi>
	<1078018b1003041648v1060ddd6ibc482b22ab4c0b2d@mail.gmail.com>
Message-ID: <1078018b1003041658h786c2b6s29f5588bc65cb944@mail.gmail.com>

o .. but u can use ur own tits.wav
if it is 44100 mono 16bit
and picklin n uploading the tofu
n having lots of those on the net
2 increase vegetrians is what soy.py wanted to mean

On Fri, Mar 5, 2010 at 9:48 AM, '2+ <electriclightheads at gmail.com> wrote:
> omg! u r actually testin my dirty code?!
> tnx that's great!
> to create an instance
> soy.py depends on(needs all of em):
>
> http://sarigama.namaste.jp/oil/tit01.wav
> http://sarigama.namaste.jp/oil/tit02.wav
> http://sarigama.namaste.jp/oil/tit03.wav
> http://sarigama.namaste.jp/oil/tit04.wav
> http://sarigama.namaste.jp/oil/tit05.wav
> http://sarigama.namaste.jp/oil/tit06.wav
> http://sarigama.namaste.jp/oil/tit07.wav
>
> and the easiest way to get the pattern is instance.pattern(howmanyframes)
> the object updates itself with .sing()
> and can affect each other with .jam_with(other_instance)
>
> this design is to (in the future) create somethang together
> with someone who would upload a short.wav on his site (to contrubute
> .. or maybe without willin to ;))
> have to study urllib(?) for things to come
> have to experiment more with picklin aspects too
> but this is my attempt to beat the
> "listenin to mp3s" culture
>
> btw. where's that help(ao)?
>
> On Fri, Mar 5, 2010 at 3:43 AM, Anssi Saari <as at sci.fi> wrote:
>> "'2+" <electriclightheads at gmail.com> writes:
>>
>>> dev = ao.AudioDevice('alsa')
>>> dev.play(x)
>>>
>>> could launch me a semi realtime dj kinda sys
>>> luckily .. it does seem to be making the right sound
>>> but why?
>>> the default of the samplerate and that 16bit happened to match with my thing x?
>>
>> Yes, that seems to be the case from help(ao). But I couldn't run
>> tofu = soy.Bean() since it seems to want tit01.wav. Do you make that
>> available somewhere?
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
>
> --
> SaRiGaMa's Oil Vending Orchestra
> is podcasting:
> http://sarigama.namaste.jp/podcast/rss.xml
>



-- 
SaRiGaMa's Oil Vending Orchestra
is podcasting:
http://sarigama.namaste.jp/podcast/rss.xml


From robert.kern at gmail.com  Thu Mar  4 20:04:30 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 04 Mar 2010 19:04:30 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <cf51c311-7354-4e89-ab2e-45bb8b66d67d@z35g2000yqd.googlegroups.com>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<mailman.209.1267635630.23598.python-list@python.org>
	<cf51c311-7354-4e89-ab2e-45bb8b66d67d@z35g2000yqd.googlegroups.com>
Message-ID: <hmplav$rhe$1@dough.gmane.org>

On 2010-03-04 15:19 PM, Mike Kent wrote:
> On Mar 3, 12:00 pm, Robert Kern<robert.k... at gmail.com>  wrote:
>> On 2010-03-03 09:39 AM, Mike Kent wrote:
>>
>>> What's the compelling use case for this vs. a simple try/finally?
>>
>>>      original_dir = os.getcwd()
>>>      try:
>>>          os.chdir(somewhere)
>>>          # Do other stuff
>>>      finally:
>>>          os.chdir(original_dir)
>>>          # Do other cleanup
>>
>> A custom-written context manager looks nicer and can be more readable.
>>
>> from contextlib import contextmanager
>> import os
>>
>> @contextmanager
>> def pushd(path):
>>       original_dir = os.getcwd()
>>       os.chdir(path)
>>       try:
>>           yield
>>       finally:
>>           os.chdir(original_dir)
>>
>> with pushd(somewhere):
>>       ...
>
> Robert, I like the way you think.  That's a perfect name for that
> context manager!  However, you can clear one thing up for me... isn't
> the inner try/finally superfluous?  My understanding was that there
> was an implicit try/finally already done which will insure that
> everything after the yield statement was always executed.

No, the try: finally: is not implicit. See the source for 
contextlib.GeneratorContextManager. When __exit__() gets an exception from the 
with: block, it will push it into the generator using its .throw() method. This 
raises the exception inside the generator at the yield statement.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From alfps at start.no  Thu Mar  4 20:59:31 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Fri, 05 Mar 2010 02:59:31 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.319.1267753708.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>	<hmokot$uso$1@news.eternal-september.org>	<mailman.293.1267718664.23598.python-list@python.org>	<hmop33$rrj$1@news.eternal-september.org>
	<mailman.319.1267753708.23598.python-list@python.org>
Message-ID: <hmpoi7$gvg$1@news.eternal-september.org>

* Steve Holden:
> Alf P. Steinbach wrote:
>> * Robert Kern:
> [...]
>>> No, it only argues that "with Cleanup():" is supernumerary.
>> I don't know what "supernumerary" means, but to the degree that the
>> argument says anything about a construct that is not 'finally', it says
>> the same about general "with".
>>
> So rather than look up the meaning if a word you aren't familiar with
> you will argue against its use in generic style?

I haven't argued against the use of the word. I haven't done so in generic 
style, and I haven't argued against generic style use of the word, whatever it 
is you're trying to say. And I see that you're out trolling again, Steve Holden, 
implying all sorts of things that are untrue, as is evidently still your style.


>> So whatever you mean by supernumerary, you're saying that the argument
>> implies that "with" is supernumerary.
>>
>> This is starting to look like some earlier discussions in this group,
>> where even basic logic is denied.
>>
> Why not just stick to the facts and forget about the earlier discussions?

For yet another example, here you are implying that I'm not sticking to facts, 
which, again, is untrue, a technique that you should be ashamed of, Steve Holden.

And since you're now injecting some Steve Holden'sk noise into this debate, 
chances are that in your points- and win/lose fixation you think I have scored a 
point immediately upthread, something which you think needs drowning in noise.


Cheers,

- Alf


From breamoreboy at yahoo.co.uk  Thu Mar  4 21:01:37 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Fri, 05 Mar 2010 02:01:37 +0000
Subject: Looking for the mysterious zlib.py* files in Python 2.6.4 (32-bit)
	for Windows
In-Reply-To: <1267744206.18232.1363186281@webmail.messagingengine.com>
References: <1267743672.16774.1363182565@webmail.messagingengine.com>
	<1267744206.18232.1363186281@webmail.messagingengine.com>
Message-ID: <hmpol6$hmh$1@dough.gmane.org>

python at bdurham.com wrote:
> In the process of building an EXE with py2exe, I noticed that
> there's no physical zlib files anywhere on my workstation.
> 
> I can import zlib and use this module's features without problem.
> But when I query zlib.__file__, I get back an empty string.
> 
> Where does the zlib code live? Is zlib a <built-in> in 2.6?
> 
> The reason I question its '<built-in>' status is that when
> analyzing my 2.6 based Py2exe produced executables with
> DependencyWalker, I see references to a zlib.pyd file that
> doesn't exist anywhere on my system. I wonder if this is
> something I should be concerned about?
> 
> Can someone explain this mystery to me?
> 
> Thank you,
> Malcolm

c:\Users\Mark>python
Python 2.6.4 (r264:75708, Oct 26 2009, 08:23:19) [MSC v.1500 32 bit 
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
 >>> import zlib
 >>> help(zlib)
Help on built-in module zlib:

NAME
     zlib

FILE
     (built-in)

[snip the rest of the help output]

IIRC a pyd file is really a DLL, but for a built-in its included into in 
this case python26.dll.

HTH.

Mark Lawrence




From dsblizzard at gmail.com  Thu Mar  4 21:10:59 2010
From: dsblizzard at gmail.com (DSblizzard)
Date: Thu, 4 Mar 2010 18:10:59 -0800 (PST)
Subject: Problem with modules reloading
Message-ID: <1ff10567-1a40-4008-a7f6-035afdf9b727@g10g2000yqh.googlegroups.com>

I have had already following question:
"How to use *.py modules instead of *.pyc?"

Last time I when asked that question I resolved problem by using one
big .py file. And answers doesn't work in my case. Now I ought to use
several files and almost the same problem arises again. Admit I have 2
modules: m2.py and m1.py

in m2.py:
from m1.py import *

def foo2():
  foo1()

foo2()

in m1.py:

# empty

After copying m2.py contents directly to python.exe:
"NameError: global name 'foo1' is not defined"

Then I define foo1 in m1 and copy following lines to python.exe:
from m1.py import *
foo2()

Nothing changes, the same error, and .pyc files, if I have deleted
them doesn't created again.

What is the solution?


From timx at nospam.dev.null  Thu Mar  4 21:20:02 2010
From: timx at nospam.dev.null (Tim X)
Date: Fri, 05 Mar 2010 13:20:02 +1100
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<26bd4a5c-4d66-4597-a0ee-b4990f468e68@g26g2000yqn.googlegroups.com>
	<e0a86785-bb68-4977-8864-010ca4f71a6c@19g2000yqu.googlegroups.com>
Message-ID: <87sk8f1pd9.fsf@lion.rapttech.com.au>

ccc31807 <cartercc at gmail.com> writes:

> On Mar 3, 4:55?pm, toby <t... at telegraphics.com.au> wrote:
>> > ?where you have to store data and
>>
>> "relational data"
>
> Data is neither relational nor unrelational. Data is data.
> Relationships are an artifact, something we impose on the data.
> Relations are for human convenience, not something inherent in the
> data itself.
>
>> > perform a large number of queries.
>>
>> Why does the number matter?
>
> Have you ever had to make a large number of queries to an XML
> database? In some ways, an XML database is the counterpart to a
> relational database in that the data descriptions constitute the
> relations. However, since the search is to the XML elements, and you
> can't construct indicies for XML databases in the same way you can
> with relational databases, a large search can take much longer that
> you might expect.
>

Most XML databases are just a re-vamp of hierarchical databases, which are
one of the two common formats that came before relational databases.
Hierarchical, network and relational databases all have their uses. 

Some 'xml' databases, like existsdb have some pretty powerful indexing
technologies. while they are different to relational db indexing because
they are based around hierarchies rather than relations, they do provide
the ability to do fast queries in the same way that indexes in
relational databases allow fast queries over relations. Both solutions
can do fast queries, they are just optimised for different types of
queries. Likewise, other database technologies that tend to fall into
this category, such as couch and mungo are aimed at applications and
problems that aren't suitable for the relational db model and are better
suited to the types of applications they have been designed for. 

As usual, Xah's rantings are of little substance here. Yes, he is right that
'nosql' is essentially just another buzzword  like 'web 2.0', but so
what? This is an industry that loves its buzzwords.Often its just
marketing hype or some convenience holder for a vague 'concept' some
journalist, consultant or blogger wants to wank on about. 

You cannot hate or love 'nosql' without defining exactly what you mean
by the term. Xah starts by acknowledging the term is ill defined
and then goes on to say how he doesn't like it because it lacks the
mathematical precision of the relational algebra that underpins the
relational model. It seems somewhat ironic to put forward an argument
focusing on the importance of precision when you fail to be precise
regarding the thing your arguing against. 

His point is further weakened by the failure to realise that SQL and the
relational model and relational algebra are different things. Not having
SQL doesn't automatically mean you cannot have a relational model or
operations that are based on relational algebra. SQL is just the
convenient query language and while it has succeeded where other
languages have not, its just one way of interacting with a relational
database. As a language SQL isn't even 'pure' in that it has operations
that don't fit with the relational algebra that he claims is so
important and includes facillities that are really business convenience
operations that actually corrupt the mathematical model and purity that
is the basis of his poorly formed argument. He also overlooks the fact
that none of the successful relational databases have remained true to
either the relational model or the underlying theory. All of the major
RDMS have corrupted things for marketing, performance or maintenance
reasons. Only a very few vendors have stayed true to the relational
model and none of them have achieved much in the way of market share, I
wonder why?

All Xah is doing is being the nets equivalent of radios 'shock jock'. He
searches for some topical issue, identifies a stance that he feels will
elicit the greatest number of emotional responses and lobs it into the
crowd. He rarely hangs around to debate his claims. When he does, he
tends to just yell and shout and more often than not, uses personal
attack to defend his statements rather than arguing the topic. His
analysis is usually shallow and based on popularism If
someone disagrees, they are a moron or a fool and if they agree, they
are a genius just like him. 

Just like true radio shock jocks, some willl love him and some will hate
him. The only things we can be certain about are that reaction is
a much hier motivator for his posts than conviction, there is
probably an inverse relationship  between IQ and support for his
arguments and that his opinion probably has the same longevity as the
term nosql.

Now if we can just get back to debating important topics like why
medical reform is the start of communism, how single mothers are
leeching of tax payers, the positive aspects of slavery, why blacks are
all criminals, how governments are evil, the holocaust conspiricy, why
all muslims are terrorists, the benefits of global warming, the bad
science corrupting our children's innocence and stop wasting time
debating this technology stuff and please people, listen to your harts
and follow your gut - don't let your intellect or so called facts get in
the way, trust your emotions. 

Tim


-- 
tcross (at) rapttech dot com dot au


From python at bdurham.com  Thu Mar  4 21:24:57 2010
From: python at bdurham.com (python at bdurham.com)
Date: Thu, 04 Mar 2010 21:24:57 -0500
Subject: Looking for the mysterious zlib.py* files in Python 2.6.4
	(32-bit) for Windows
In-Reply-To: <hmpol6$hmh$1@dough.gmane.org>
References: <1267743672.16774.1363182565@webmail.messagingengine.com><1267744206.18232.1363186281@webmail.messagingengine.com>
	<hmpol6$hmh$1@dough.gmane.org>
Message-ID: <1267755897.13084.1363210547@webmail.messagingengine.com>

> IIRC a pyd file is really a DLL, but for a built-in its included into in this case python26.dll.

Mystery solved! Thanks Mark!

Regards,
Malcolm


From steve at REMOVE-THIS-cybersource.com.au  Thu Mar  4 21:55:46 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 02:55:46 GMT
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
	<87eik3zmi8.fsf@benfinney.id.au>
	<20100302184056.743a71e7@geekmail.INVALID>
	<mailman.129.1267553139.23598.python-list@python.org>
	<20100302225156.67171851@geekmail.INVALID>
	<877hpuxpdf.fsf@benfinney.id.au> <7v6ae4Ff37U1@mid.individual.net>
	<pan.2010.03.03.05.48.49@REMOVE.THIS.cybersource.com.au>
	<7v9g9qF1nkU1@mid.individual.net>
Message-ID: <4b9072b2$0$27863$c3e8da3@news.astraweb.com>

On Thu, 04 Mar 2010 23:38:31 +1300, Gregory Ewing wrote:

> Steven D'Aprano wrote:
> 
>> True, but one can look at "best practice", or even "standard practice".
>> For Python coders, using docstrings is standard practice if not best
>> practice. Using strings as comments is not.
> 
> In that particular case, yes, it would be possible to objectively
> examine the code and determine whether docstrings were being used as
> opposed to above-the-function comments.
> 
> However, that's only a very small part of what goes to make good code.
> Much more important are questions like: Are the comments meaningful and
> helpful? Is the code reasonably self-explanatory outside of the
> comments? Is it well modularised, and common functionality factored out
> where appropriate? Are couplings between different parts minimised? Does
> it make good use of library code instead of re-inventing things? Is it
> free of obvious security flaws?
> 
> You can't *measure* these things. You can't objectively boil them down
> to a number and say things like "This code is 78.3% good; the customer
> requires it to be at least 75% good, so it meets the requirements in
> that area."
> 
> That's the way in which I believe that software engineering is
> fundamentally different from hardware engineering.


You are conflating two independent questions:

(a) Can we objectively judge the goodness of code, or is it subjective?

(b) Is goodness of code quantitative, or is it qualitative?

You can turn any qualitative measurement into a quantitative measurement 
by turning it into a score from 0 to 10 (say). Instead of "best/good/
average/poor/crap" just rate it from 1 through 5, and now you have a 
measurement that can be averaged and compared with other measurements.

The hard part is turning subjective judgements ("are these comments 
useful, or are they pointless or misleading?") into objective judgements. 
It may be that there is no entirely objective way to measure such things. 
But we can make quasi-objective judgements, by averaging out all the 
individual quirks of subjective judgement:

(1) Take 10 independent judges who are all recognised as good Python 
coders by their peers, and ask them to give a score of 1-5 for the 
quality of the comments, where 1 means "really bad" and 5 means "really 
good". If the average score is 4 or higher, gain a point. If the average 
score is 3 or lower, lose a point.

(2) Take 10 independent judges, as above, and rate the code on how self-
explanatory it is. An average score of 3 or higher gives a point; an 
average of under 2 loses a point.

(Note that I'm more forgiving of non-self-explanatory code than I am of 
bad comments. Better to have no comments than bad ones!)

And so on, through all the various metrics you want to measure.

If the total number of points exceeds some threshold, the software 
passes, otherwise it fails, and you have a nice list of all the weak 
areas that need improvement.

You can do fancy things too, like discard the highest and lowest score 
from the ten judges (to avoid an unusually strict, or unusually slack, 
judge from distorting the scores).

If this all seems too expensive, then you can save money by having fewer 
judges, perhaps even as few as a single code reviewer who is trusted to 
meet whatever standards you are hoping to apply. Or have the judges rate 
randomly selected parts of the code rather than all of it. This will 
severely penalise code that isn't self-explanatory and modular, as the 
judges will not be able to understand it and consequently give it a low 
score.

Of course, there is still a subjective component to this. But it is a 
replicable metric: any group of ten judges should give quite similar 
scores, up to whatever level of confidence you want, and one can perform 
all sorts of objective statistical tests on them to determine whether 
deviations are due by chance or not.

To do all this on the cheap, you could even pass it through something 
like PyLint, which gives you an objective (but not very complete) 
measurement of code quality.

The real problem isn't that defining code quality can't be done, but that 
it can't be done *cheaply*. There are cheap methods, but they aren't very 
good, and good methods, but they're very expensive.


-- 
Steven


From weasle182222 at googlemail.com  Thu Mar  4 22:09:57 2010
From: weasle182222 at googlemail.com (lucky-villa)
Date: Thu, 4 Mar 2010 19:09:57 -0800 (PST)
Subject: baufinanzierung berechnung , eigentumswohnungen finanzieren , 
	eigenheimzulage verdienstgrenze , eigenheimzulage unentgeltliche , 
	bauspardarlehen in anspruch nehmen , immobilienfinanzierung von , 
	eigenheimzulage ab 2009 ,
Message-ID: <a8ec1df1-01b9-4b55-8a7f-5faf36e1b26a@k17g2000yqb.googlegroups.com>

baufinanzierung berechnung , eigentumswohnungen finanzieren ,
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From rami.chowdhury at gmail.com  Thu Mar  4 22:11:39 2010
From: rami.chowdhury at gmail.com (Rami Chowdhury)
Date: Thu, 4 Mar 2010 19:11:39 -0800
Subject: Problem with modules reloading
In-Reply-To: <1ff10567-1a40-4008-a7f6-035afdf9b727@g10g2000yqh.googlegroups.com>
References: <1ff10567-1a40-4008-a7f6-035afdf9b727@g10g2000yqh.googlegroups.com>
Message-ID: <E3006C2D-BB00-4C6B-B70C-677EA35ED1B2@gmail.com>


On Mar 4, 2010, at 18:10 , DSblizzard wrote:

> I have had already following question:
> "How to use *.py modules instead of *.pyc?"
> 
> Last time I when asked that question I resolved problem by using one
> big .py file. And answers doesn't work in my case. Now I ought to use
> several files and almost the same problem arises again. Admit I have 2
> modules: m2.py and m1.py
> 
> in m2.py:
> from m1.py import *
> 
> def foo2():
>  foo1()
> 
> foo2()
> 
> in m1.py:
> 
> # empty
> 
> After copying m2.py contents directly to python.exe:
> "NameError: global name 'foo1' is not defined"
> 
> Then I define foo1 in m1 and copy following lines to python.exe:
> from m1.py import *
> foo2()
> 

When you execute the import statement again, Python checks to see which module you are importing from, sees that you have already imported that module, and doesn't reload it. So nothing changes. If you need to reload m1, then use the reload() function:

reload(m1)

It's generally a good idea to avoid statements like "from m1 import *", to avoid confusion and keep your namespaces separate. So if you had defined m2.py like this...

import m1
def foo2():
  m1.foo1()

...then "reload(m1)" would solve your problem straight away.

> Nothing changes, the same error, and .pyc files, if I have deleted
> them doesn't created again.
> 
> What is the solution?
> -- 
> http://mail.python.org/mailman/listinfo/python-list



From hawccer at gmail.com  Thu Mar  4 22:30:17 2010
From: hawccer at gmail.com (Adhitya Jiwa Pratama)
Date: Fri, 5 Mar 2010 10:30:17 +0700
Subject: No subject
Message-ID: <a7daa8dc1003041930v519cc663u1f51b0f534a59a16@mail.gmail.com>




From steve at REMOVE-THIS-cybersource.com.au  Thu Mar  4 22:32:46 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 03:32:46 GMT
Subject: Generic singleton
References: <mailman.222.1267642515.23598.python-list@python.org>
	<pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>
	<Xns9D317DB33C63Aduncanbooth@127.0.0.1>
Message-ID: <4b907b5e$0$27863$c3e8da3@news.astraweb.com>

On Thu, 04 Mar 2010 12:21:26 +0000, Duncan Booth wrote:

> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:
> 
>> On Wed, 03 Mar 2010 19:54:52 +0100, mk wrote:
>> 
>>> Hello,
>>> 
>>> So I set out to write generic singleton, i.e. the one that would do a
>>> singleton with attributes of specified class. At first:
>> 
>> Groan. What is it with the Singleton design pattern? It is one of the
>> least useful design patterns, and yet it's *everywhere* in Java and C++
>> world.
> 
> It is also *everywhere* in the Python world. Unlike Java and C++, Python
> even has its own built-in type for singletons.
> 
> If you want a singleton in Python use a module.

I was wondering who would be the first to point that out :)

You are, of course, correct that the preferred way to solve the Singleton 
problem is with a module. (The other preferred way is with the Borg 
pattern, which is kind of a reverse-Singleton.) Using classes works too: 
so long as you do not instantiate it, but use it as an object in its own 
right, a class is also a singleton.

However, I don't think it's quite right to say that modules *are* 
Singletons, although I accept that this is now getting into a tedious 
argument about terminology. A singleton is an instance of a class which 
can only have a single instance. This is not true of modules:

>>> import string, math
>>> type(string) is type(math)
True
>>> string is math
False

Wikipedia points out that the Singleton pattern is normally understood to 
exclude static structures which merely happen to be created once:

"Note the distinction between a simple static instance of a class and a 
singleton..."

http://en.wikipedia.org/wiki/Singleton_pattern

Each individual module is a static instance of the module class which 
merely happens to be instantiated once. (You can subvert Python's import 
machinery to create multiple copies of a module, but normally this 
doesn't happen.) So *technically* modules are not singletons, although 
they behave just like them and give all the benefits, and disadvantages, 
of such. And as you say, the preferred Pythonic solution to the 
requirement for a Singleton is usually a module.

Python does have it's own singletons, like None, True and False. For some 
reason, they behave quite differently: NoneType fails if you try to 
instantiate it again, while bool returns the appropriate existing 
singleton:

>>> NoneType = type(None)
>>> NoneType()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: cannot create 'NoneType' instances
>>> bool(45)
True


I wonder why NoneType doesn't just return None?


-- 
Steven


From robert.kern at gmail.com  Thu Mar  4 22:35:13 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 04 Mar 2010 21:35:13 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <6af3c613-3439-484b-83f1-49213f1ed574@k17g2000yqb.googlegroups.com>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>
	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>
	<hmokot$uso$1@news.eternal-september.org>	<mailman.293.1267718664.23598.python-list@python.org>
	<hmop33$rrj$1@news.eternal-september.org>	<mailman.303.1267723835.23598.python-list@python.org>
	<6af3c613-3439-484b-83f1-49213f1ed574@k17g2000yqb.googlegroups.com>
Message-ID: <hmpu64$us8$1@dough.gmane.org>

On 2010-03-04 15:12 , Mike Kent wrote:
> On Mar 4, 12:30 pm, Robert Kern<robert.k... at gmail.com>  wrote:
>
>> He's ignorant of the use cases of the with: statement, true.
>
> <humor>  Ouch!  Ignorant of the use cases of the with statement, am I?
> Odd, I use it all the time.</humor>

No, I was referring to Jean-Michel, who was not familiar with the with: statement.

>> Given only your
>> example of the with: statement, it is hard to fault him for thinking that try:
>> finally: wouldn't suffice.
>
> <humor>  Damn me with faint praise, will you?</humor>

Also talking about Jean-Michel. :-)

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From robert.kern at gmail.com  Thu Mar  4 22:42:32 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 04 Mar 2010 21:42:32 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <hmpc3r$2il$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>	<hmokot$uso$1@news.eternal-september.org>	<mailman.293.1267718664.23598.python-list@python.org>	<hmop33$rrj$1@news.eternal-september.org>	<mailman.303.1267723835.23598.python-list@python.org>	<6af3c613-3439-484b-83f1-49213f1ed574@k17g2000yqb.googlegroups.com>
	<hmpc3r$2il$1@news.eternal-september.org>
Message-ID: <hmpujr$vhg$1@dough.gmane.org>

On 2010-03-04 16:27 , Alf P. Steinbach wrote:
> * Mike Kent:

>> However, I fail to understand his response that I must have meant try/
>> else instead, as this, as Mr. Kern pointed out, is invalid syntax.
>> Perhaps Mr. Steinbach would like to give an example?
>
> OK.
>
> Assuming that you wanted the chdir to be within a try block (which it
> was in your code), then to get code equivalent to my code, for the
> purpose of a comparision of codes that do the same, you'd have to write
> something like ...
>
> original_dir = os.getcwd()
> try:
> os.chdir(somewhere)
> except Whatever:
> # E.g. log it.
> raise
> else:
> try:
> # Do other stuff
> finally:
> os.chdir(original_dir)
> # Do other cleanup
>
> ... which would be a more general case.
>
> I've also given this example in response to Robert earlier in the
> thread. Although I haven't tried it I believe it's syntactically valid.
> If not, then the relevant typo should just be fixed. :-)
>
> I have no idea which construct Robert thought was syntactically invalid.
> I think that if he's written that, then it must have been something he
> thought of.

I was just trying to interpret what you meant by "Changing 'finally' to 'else' 
could make it equivalent." As far as I can tell, that has only one possible 
interpretation going by the plain meaning of the words, and it isn't yours. 
Since you always seem to refer to "try/else" as if it were an independent 
construct and not part of "try: except: else:" and no one else introduced 
except: clause, I must reiterate that your communications have been fabulously 
misleading.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From timr at probo.com  Thu Mar  4 22:44:34 2010
From: timr at probo.com (Tim Roberts)
Date: Thu, 04 Mar 2010 19:44:34 -0800
Subject: python 2.6: how to modify a PIL image from C without copying
	forth and back
References: <4b8daf7d$0$2868$426a74cc@news.free.fr>
	<8m0so5d5lmgg3dombnssflnt1jh6h0ka3v@4ax.com>
	<4b8e2129$0$8262$426a34cc@news.free.fr>
Message-ID: <iev0p5h72gum049d04fpa4hc4s08ksl7bs@4ax.com>

News123 <news123 at free.fr> wrote:
>
>Yes, this might be an option
>Somehow though it didn't feel right for me to depend on internal non
>documented data types, which might change between releases of PIL.

That's absolutely true.  If performance is a priority, somethimes you have
to do things that are "dirty".  Just include lots of comments saying what
you did and why.

Personally, because so much of PIL is in C, I would judge internal changes
to be unlikely.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From steve at REMOVE-THIS-cybersource.com.au  Thu Mar  4 23:01:21 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 04:01:21 GMT
Subject: Problem with modules reloading
References: <1ff10567-1a40-4008-a7f6-035afdf9b727@g10g2000yqh.googlegroups.com>
Message-ID: <4b908210$0$27863$c3e8da3@news.astraweb.com>

On Thu, 04 Mar 2010 18:10:59 -0800, DSblizzard wrote:

> I have had already following question: "How to use *.py modules instead
> of *.pyc?"
> 
> Last time I when asked that question I resolved problem by using one big
> .py file. 

I think you are confused.

.pyc files are Python compiled byte-code files. You don't use them, 
Python does. When you import a module, Python *automatically* compiles it 
and creates a .pyc file, which is then used to speed up loading next time 
you run Python and import the same module.

If you delete the .pyc file, it is quietly recreated next time you import 
the module again.

Using "one big .py file" or not, this has nothing to do with whether 
Python loads the module from source-code or byte-code. Just ignore 
the .pyc files.




> And answers doesn't work in my case. Now I ought to use
> several files and almost the same problem arises again. Admit I have 2
> modules: m2.py and m1.py
> 
> in m2.py:
> from m1.py import *

That won't work, because Python looks for a package called "m1" which 
contains a module called "py". The only way that line can succeed is if 
you have a directory called "m1" containing two files called 
"__init__.py" and "py.py", like this:

m1/
m1/__init__.py
m1/py.py


Python will then load __init__.py, then load py.py. Since I'm pretty sure 
you don't have that directory, the above line cannot possible work.




> What is the solution?

Don't use "from module import *", it is confusing and doesn't work with 
reload(module) at all.

You shouldn't use reload(module) except for experimentation in the 
interactive interpreter.

You should work through the part of the tutorial that talks about modules 
and imports.

http://docs.python.org/tutorial/
http://docs.python.org/tutorial/modules.html


Good luck!


-- 
Steven



From robert.kern at gmail.com  Thu Mar  4 23:01:44 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 04 Mar 2010 22:01:44 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <hmph3b$20o$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>	<hmn03d$5r6$1@news.eternal-september.org>	<mailman.292.1267717742.23598.python-list@python.org>	<hmooo6$pg0$1@news.eternal-september.org>	<mailman.300.1267723245.23598.python-list@python.org>	<hmoul7$2i9$1@news.eternal-september.org>	<mailman.314.1267744631.23598.python-list@python.org>
	<hmph3b$20o$1@news.eternal-september.org>
Message-ID: <hmpvnr$1uf$1@dough.gmane.org>

On 2010-03-04 17:52 , Alf P. Steinbach wrote:
> * Robert Kern:
>> On 2010-03-04 12:37 PM, Alf P. Steinbach wrote:
>>> * Robert Kern:
>>>> On 2010-03-04 10:56 AM, Alf P. Steinbach wrote:
>>>>> * Robert Kern:
>>>>>> On 2010-03-03 18:49 PM, Alf P. Steinbach wrote:
>>> [snippety]
>>>>>>
>>>>>>> If you call the possibly failing operation "A", then that systematic
>>>>>>> approach goes like this: if A fails, then it has cleaned up its own
>>>>>>> mess, but if A succeeds, then it's the responsibility of the calling
>>>>>>> code to clean up if the higher level (multiple statements) operation
>>>>>>> that A is embedded in, fails.
>>>>>>>
>>>>>>> And that's what Marginean's original C++ ScopeGuard was designed
>>>>>>> for,
>>>>>>> and what the corresponding Python Cleanup class is designed for.
>>>>>>
>>>>>> And try: finally:, for that matter.
>>>>>
>>>>> Not to mention "with".
>>>>>
>>>>> Some other poster made the same error recently in this thread; it is a
>>>>> common fallacy in discussions about programming, to assume that since
>>>>> the same can be expressed using lower level constructs, those are all
>>>>> that are required.
>>>>>
>>>>> If adopted as true it ultimately means the removal of all control
>>>>> structures above the level of "if" and "goto" (except Python doesn't
>>>>> have "goto").
>>>>
>>>> What I'm trying to explain is that the with: statement has a use even
>>>> if Cleanup doesn't. Arguing that Cleanup doesn't improve on try:
>>>> finally: does not mean that the with: statement doesn't improve on
>>>> try: finally:.
>>>
>>> That's a different argument, essentially that you see no advantage for
>>> your current coding patterns.
>>>
>>> It's unconnected to the argument I responded to.
>>>
>>> The argument that I responded to, that the possibility of expressing
>>> things at the level of try:finally: means that a higher level construct
>>> is superfluous, is still meaningless.
>>
>> I am attacking your premise that the "with Cleanup():" construct is
>> higher level than try: finally:. It isn't. It provides the same level
>> of abstraction as try: finally:.
>>
>> This is distinct from the accepted uses of the with: statement which
>> *are* higher level than try: finally: and which do confer practical
>> benefits over using try: finally: despite being syntactical sugar for
>> try: finally:.
>>
>>>>>>>> Both formulations can be correct (and both work perfectly fine with
>>>>>>>> the chdir() example being used). Sometimes one is better than the
>>>>>>>> other, and sometimes not. You can achieve both ways with either
>>>>>>>> your
>>>>>>>> Cleanup class or with try: finally:.
>>>>>>>>
>>>>>>>> I am still of the opinion that Cleanup is not an improvement over
>>>>>>>> try:
>>>>>>>> finally: and has the significant ugliness of forcing cleanup code
>>>>>>>> into
>>>>>>>> callables. This significantly limits what you can do in your
>>>>>>>> cleanup
>>>>>>>> code.
>>>>>>>
>>>>>>> Uhm, not really. :-) As I see it.
>>>>>>
>>>>>> Well, not being able to affect the namespace is a significant
>>>>>> limitation. Sometimes you need to delete objects from the
>>>>>> namespace in
>>>>>> order to ensure that their refcounts go to zero and their cleanup
>>>>>> code
>>>>>> gets executed.
>>>>>
>>>>> Just a nit (I agree that a lambda can't do this, but as to what's
>>>>> required): assigning None is sufficient for that[1].
>>>>
>>>> Yes, but no callable is going to allow you to assign None to names in
>>>> that namespace, either. Not without sys._getframe() hackery, in any
>>>> case.
>>>>
>>>>> However, note that the current language doesn't guarantee such
>>>>> cleanup,
>>>>> at least as far as I know.
>>>>>
>>>>> So while it's good practice to support it, to do everything to let it
>>>>> happen, it's presumably bad practice to rely on it happening.
>>>>>
>>>>>
>>>>>> Tracebacks will keep the namespace alive and all objects in it.
>>>>>
>>>>> Thanks!, I hadn't thought of connecting that to general cleanup
>>>>> actions.
>>>>>
>>>>> It limits the use of general "with" in the same way.
>>>>
>>>> Not really.
>>>
>>> Sorry, it limits general 'with' in /exactly/ the same way.
>>>
>>>> It's easy to write context managers that do that [delete objects from
>>>> the namespace].
>>>
>>> Sorry, no can do, as far as I know; your following example quoted below
>>> is an example of /something else/.
>>
>> Okay, so what do you mean by 'the use of general "with"'? I'm talking
>> about writing a context manager or using the @contextmanager decorator
>> to do some initialization and then later cleaning up that
>> initialization. That cleaning up may entail deleting an object. You
>> are correct that the context manager can't affect the namespace of the
>> with: clause, but that's not the initialization that it would need to
>> clean up.
>>
>> Yes, you can write code with a with: statement where you try to clean
>> up stuff that happened inside of the clause (you did), but that's not
>> how the with: statement was ever intended to be used nor is it good
>> practice to do so because of that limitation. Context managers are
>> designed to initialize specific things, then clean them up. I thought
>> you were talking about the uses of the with: statement as described in
>> PEP-343, not every possible misuse of the with: statement.
>
> I'm not the one talking about removing variables or that "it's easy to
> write context managers that do that".
>
> You are the one talking about that.
>
> So I have really not much to add.
>
> It seems that you're now agreeing with me that former is not good
> practice and that the latter is impossible to do portably, but you now
> argue against your earlier stand as if that was something that I had put
> forward.

No, I'm still saying that sometimes you do need to remove variables that you 
initialized in the initialization section. Writing a purpose-built context 
manager which encapsulates the initialization and finalization allows you to do 
this easily. Putting the initialization section inside the with: clause, as you 
do, and requiring cleanup code to be put into callables makes this hard.

> It's a bit confusing when you argue against your own statements.
>
>>> And adding on top of irrelevancy, for the pure technical aspect it can
>>> be accomplished in the same way using Cleanup (I provide an example
>>> below).
>>>
>>> However, doing that would generally be worse than pointless since with
>>> good coding practices the objects would become unreferenced anyway.
>>>
>>>
>>>> You put the initialization code in the __enter__() method, assign
>>>> whatever objects you want to keep around through the with: clause as
>>>> attributes on the manager, then delete those attributes in the
>>>> __exit__().
>>>
>>> Analogously, if one were to do this thing, then it could be accomplished
>>> using a Cleanup context manager as follows:
>>>
>>> foo = lambda: None
>>> foo.x = create_some_object()
>>> at_cleanup.call( lambda o = foo: delattr( o, "x" ) )
>>>
>>> ... except that
>>>
>>> 1) for a once-only case this is less code :-)
>>
>> Not compared to a try: finally:, it isn't.
>
> Again, this context shifting is bewildering. As you can see, quoted
> above, you were talking about a situation where you would have defined a
> context manager, presumably because a 'try' would not in your opinion be
> simpler for whatever it was that you had in mind. But you are responding
> to the code I offered as if it was an alternative to something where you
> would find a 'try' to be simplest.

I have consistently put forward that for once-only cases, try: finally: is a 
preferable construct to "with Cleanup():". I also put forward that for 
repetitive cases, a purpose-built context manager is preferable. I note that for 
both try: finally: and a purpose-built context manager, modifying the namespace 
is easy to do while it is difficult and less readable to do with "with 
Cleanup():". Since you were claiming that the "generic with:" would have the 
same problem as "with Cleanup():" I was trying to explain for why all of the 
intended use cases of the with: statement (the purpose-built context managers), 
there is no problem. Capisce?

>>> 2) it is a usage that I wouldn't recommend; instead I recommend adopting
>>> good
>>> coding practices where object references aren't kept around.
>>
>> Many of the use cases of the with: statement involve creating an
>> object (like a lock or a transaction object), keeping it around for
>> the duration of the "# Do stuff" block, and then finalizing it.
>>
>>>> Or, you use the @contextmanager decorator to turn a generator into a
>>>> context manager, and you just assign to local variables and del them
>>>> in the finally: clause.
>>>
>>> Uhm, you don't need a 'finally' clause when you define a context
>>> manager.
>>
>> When you use the @contextmanager decorator, you almost always do. See
>> the Examples section of PEP 343:
>>
>> http://www.python.org/dev/peps/pep-0343/
>>
>>> Additionally, you don't need to 'del' the local variables in
>>> @contextmanager decorated generator.
>>>
>>> The local variables cease to exist automatically.
>>
>> True.
>>
>>>> What you can't do is write a generic context manager where the
>>>> initialization happens inside the with: clause and the cleanup actions
>>>> are registered callables. That does not allow you to affect the
>>>> namespace.
>>>
>>> If you mean that you can't introduce direct local variables and have
>>> them deleted by "registered callables" in a portable way, then right.
>>>
>>> But I can't think of any example where that would be relevant; in
>>> particular what matters for supporting on-destruction cleanup is whether
>>> you keep any references or not, not whether you have a local variable of
>>> any given name.
>>
>> Well, local variables keep references to objects. Variable assignment
>> followed by deletion is a very readable way to keep an object around
>> for a while then remove it later. If you have to go through less
>> readable contortions to keep the object around when it needs to be and
>> clean it up later, then that is a mark against your approach.
>
> Sorry, as with the places noted above, I can't understand what you're
> trying to say here. I don't recommend coding practices where you keep
> object references around,

Then how do you clean up locks and transaction objects and similar things if you 
don't keep them around during the code suite? Creating an object, keeping it 
around while executing a specific chunk of code, and finalizing it safely is a 
prime use case for these kinds of constructs.

> and you have twice quoted that above. I don't
> have any clue what "contortions" you are talking about, it must be
> something that you imagine.

These are the contortions:

   foo = lambda: None
   foo.x = create_some_object()
   at_cleanup.call( lambda o = foo: delattr( o, "x" ) )

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From chris.lieb at gmail.com  Thu Mar  4 23:07:12 2010
From: chris.lieb at gmail.com (Chris Lieb)
Date: Thu, 4 Mar 2010 20:07:12 -0800 (PST)
Subject: Failure in test_hashlib.py and test_hmac.py
References: <175865db-f64a-4633-8e36-ab4a5a5eaccf@x22g2000yqx.googlegroups.com>
Message-ID: <545b8abb-72a3-4527-b290-d937cfce5470@t23g2000yqt.googlegroups.com>

On Mar 3, 8:33?pm, Chris Lieb <chris.l... at gmail.com> wrote:
> I am building Python 2.6.4 on a shared server and am encountering test
> failures in test_hashlib.py and test_hmac.py, specifically concerning
> sha512. ?I recompiled Python with --with-pydebug and CLFAGS=CPPFLAGS="-
> g" and ran the tests in GDB and got the following results:
>
> ----------------------------------------------------------------------------
>
> GNU gdb 6.6.50.20070726-cvs
> Copyright (C) 2007 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and
> you are
> welcome to change it and/or distribute copies of it under certain
> conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB. ?Type "show warranty" for
> details.
> This GDB was configured as "x86_64-suse-linux"...
> Using host libthread_db library "/lib64/libthread_db.so.1".
> (gdb) run test_hashlib.py
> Starting program: /export/users1/chris.lieb/packages/python/bin/
> python2.6 test_hashlib.py
> test_case_md5_0 (__main__.HashLibTestCase) ... ok
> test_case_md5_1 (__main__.HashLibTestCase) ... ok
> test_case_md5_2 (__main__.HashLibTestCase) ... ok
> test_case_md5_huge (__main__.HashLibTestCase) ... ok
> test_case_md5_uintmax (__main__.HashLibTestCase) ... ok
> test_case_sha1_0 (__main__.HashLibTestCase) ... ok
> test_case_sha1_1 (__main__.HashLibTestCase) ... ok
> test_case_sha1_2 (__main__.HashLibTestCase) ... ok
> test_case_sha1_3 (__main__.HashLibTestCase) ... ok
> test_case_sha224_0 (__main__.HashLibTestCase) ... ok
> test_case_sha224_1 (__main__.HashLibTestCase) ... ok
> test_case_sha224_2 (__main__.HashLibTestCase) ... ok
> test_case_sha224_3 (__main__.HashLibTestCase) ... ok
> test_case_sha256_0 (__main__.HashLibTestCase) ... ok
> test_case_sha256_1 (__main__.HashLibTestCase) ... ok
> test_case_sha256_2 (__main__.HashLibTestCase) ... ok
> test_case_sha256_3 (__main__.HashLibTestCase) ... ok
> test_case_sha384_0 (__main__.HashLibTestCase) ... ok
> test_case_sha384_1 (__main__.HashLibTestCase) ... ok
> test_case_sha384_2 (__main__.HashLibTestCase) ... ok
> test_case_sha384_3 (__main__.HashLibTestCase) ... ok
> test_case_sha512_0 (__main__.HashLibTestCase) ... FAIL
> test_case_sha512_1 (__main__.HashLibTestCase) ... FAIL
> test_case_sha512_2 (__main__.HashLibTestCase) ... FAIL
> test_case_sha512_3 (__main__.HashLibTestCase) ... FAIL
> test_hexdigest (__main__.HashLibTestCase) ...
> Program received signal SIGSEGV, Segmentation fault.
> Cannot remove breakpoints because program is no longer writable.
> It might be running in another process.
> Further execution is probably impossible.
> 0x00002ba86ffbb463 in ?? ()
> (gdb) bt
> #0 ?0x00002ba86ffbb463 in ?? ()
> #1 ?0x000000000046993d in PyString_FromStringAndSize (
> ? ? str=0x7fff71c67800 " \203 5~? T(P m\200\a \005\vW
> \025 \203 ! l G <]
> \205 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?5
> \203\030 \207~ /c 1 GAz\201 82z ' > x q \177",
> size=1054484473)
> ? ? at Objects/stringobject.c:90
> #2 ?0x00002ba87030d59a in ?? ()
> #3 ?0x0000000000000000 in ?? ()
>
> -----------------------------------------------------------------------------------------
>
> GNU gdb 6.6.50.20070726-cvs
> Copyright (C) 2007 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and
> you are
> welcome to change it and/or distribute copies of it under certain
> conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB. ?Type "show warranty" for
> details.
> This GDB was configured as "x86_64-suse-linux"...
> Using host libthread_db library "/lib64/libthread_db.so.1".
> (gdb) run test_hmac.py
> Starting program: /export/users1/chris.lieb/packages/python/bin/
> python2.6 test_hmac.py
> test_legacy_block_size_warnings (__main__.TestVectorsTestCase) ... ok
> test_md5_vectors (__main__.TestVectorsTestCase) ... ok
> test_sha224_rfc4231 (__main__.TestVectorsTestCase) ... ok
> test_sha256_rfc4231 (__main__.TestVectorsTestCase) ... ok
> test_sha384_rfc4231 (__main__.TestVectorsTestCase) ... ok
> test_sha512_rfc4231 (__main__.TestVectorsTestCase) ...
> Program received signal SIGSEGV, Segmentation fault.
> Cannot remove breakpoints because program is no longer writable.
> It might be running in another process.
> Further execution is probably impossible.
> 0x00002b483844e4c7 in ?? ()
> (gdb) bt
> #0 ?0x00002b483844e4c7 in ?? ()
> #1 ?0x000000000046993d in PyString_FromStringAndSize (
> ? ? str=0x7ffff84f6730 "\026C3D \235D\t \025 [ G
> \032bG? ~ \235\t\233aP",
> ? ? size=4108309188) at Objects/stringobject.c:90
> #2 ?0x00002b48387e159a in ?? ()
> #3 ?0x0000000000000000 in ?? ()
>
> --------------------------------------------------------------------
>
> In the case of test_hashlib.py, it segfaulted on the first sha512 test
> when I didn't have the debugging options enabled. ?Only after enabling
> debugging did I get FAIL's for the sha512 tests.
>
> Does anyone know what is causing these failures?

Does anyone have any tips or insights for trying to debug this issue?
Any help is greatly appreciated.

--
Chris Lieb


From showell30 at yahoo.com  Thu Mar  4 23:14:42 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Thu, 4 Mar 2010 20:14:42 -0800 (PST)
Subject: Generic singleton
References: <mailman.222.1267642515.23598.python-list@python.org> 
	<pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>
	<Xns9D317DB33C63Aduncanbooth@127.0.0.1> 
	<4b907b5e$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <866ef5a6-119d-4962-bf99-57915d3a59d5@g28g2000prb.googlegroups.com>

On Mar 4, 7:32?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
>
> Python does have it's own singletons, like None, True and False. For some
> reason, they behave quite differently: NoneType fails if you try to
> instantiate it again, while bool returns the appropriate existing
> singleton:
>
> >>> NoneType = type(None)
> >>> NoneType()
>
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in <module>
> TypeError: cannot create 'NoneType' instances>>> bool(45)
>
> True
>
> I wonder why NoneType doesn't just return None?
>

It's an interesting question.  Just to elaborate on your example:

    >>> type(None)()
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    TypeError: cannot create 'NoneType' instances
    >>> type(True)(False)
    False
    >>> type(False)(True)
    True

I suspect that the answer is just that None is special.  There is
probably just no compelling use case where you want to clone None in a
one-liner.

To make None work like True/False in certain use cases you'd want
something like this:

    def clone(val):
        if val is None:
            return None
        else:
            return type(val)(val)

The same method would work against some non-singletons as well,
although I'm not sure what the desired semantics would actually be:

    for value in [None, False, True, 42, [1, 2, 3]]:
        print clone(value)



From showell30 at yahoo.com  Thu Mar  4 23:37:50 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Thu, 4 Mar 2010 20:37:50 -0800 (PST)
Subject: A "scopeguard" for Python
References: <hmlu55$n1s$1@news.eternal-september.org>
Message-ID: <dc2f6b66-73af-4510-845c-b2d014c83520@b7g2000pro.googlegroups.com>

On Mar 3, 7:10?am, "Alf P. Steinbach" <al... at start.no> wrote:
> For C++ Petru Marginean once invented the "scope guard" technique (elaborated on
> by Andrei Alexandrescu, they published an article about it in DDJ) where all you
> need to do to ensure some desired cleanup at the end of a scope, even when the
> scope is exited via an exception, is to declare a ScopeGuard w/desired action.
>
> The C++ ScopeGuard was/is for those situations where you don't have proper
> classes with automatic cleanup, which happily is seldom the case in good C++
> code, but languages like Java and Python don't support automatic cleanup and so
> the use case for something like ScopeGuard is ever present.
>
> For use with a 'with' statement and possibly suitable 'lambda' arguments:
>
> <code>
> class Cleanup:
> ? ? ?def __init__( self ):
> ? ? ? ? ?self._actions = []
>
> ? ? ?def call( self, action ):
> ? ? ? ? ?assert( is_callable( action ) )
> ? ? ? ? ?self._actions.append( action )
>
> ? ? ?def __enter__( self ):
> ? ? ? ? ?return self
>
> ? ? ?def __exit__( self, x_type, x_value, x_traceback ):
> ? ? ? ? ?while( len( self._actions ) != 0 ):
> ? ? ? ? ? ? ?try:
> ? ? ? ? ? ? ? ? ?self._actions.pop()()
> ? ? ? ? ? ? ?except BaseException as x:
> ? ? ? ? ? ? ? ? ?raise AssertionError( "Cleanup: exception during cleanup" ) from
> </code>
>
> I guess the typical usage would be what I used it for, a case where the cleanup
> action (namely, changing back to an original directory) apparently didn't fit
> the standard library's support for 'with', like
>
> ? ?with Cleanup as at_cleanup:
> ? ? ? ?# blah blah
> ? ? ? ?chdir( somewhere )
> ? ? ? ?at_cleanup.call( lambda: chdir( original_dir ) )
> ? ? ? ?# blah blah
>
> Another use case might be where one otherwise would get into very deep nesting
> of 'with' statements with every nested 'with' at the end, like a degenerate tree
> that for all purposes is a list. Then the above, or some variant, can help to
> /flatten/ the structure. To get rid of that silly & annoying nesting. :-)
>
> Cheers,
>
> - Alf (just sharing, it's not seriously tested code)

Hi Alf, I think I understand the notion you're going after here.  You
have multiple cleanup steps that you want to defer till the end, and
there is some possibility that things will go wrong along the way, but
you want to clean up as much as you can.  And, of course, flatter is
better.

Is this sort of what you are striving for?

    class Cleanup:
         def __init__( self ):
             self._actions = []

         def call( self, action ):
             self._actions.append( action )

         def __enter__( self ):
             return self

         def __exit__( self, x_type, x_value, x_traceback ):
             while( len( self._actions ) != 0 ):
                 try:
                     self._actions.pop()()
                 except BaseException as x:
                     raise AssertionError( "Cleanup: exception during
cleanup" )

    def clean_the_floor():
        print('clean the floor')

    def carouse(num_bottles, accident):
        with Cleanup() as at_cleanup:
            at_cleanup.call(clean_the_floor)
            for i in range(num_bottles):
                def take_down(i=i):
                    print('take one down', i)
                at_cleanup.call(take_down)
                if i == accident:
                    raise Exception('oops!')
                print ('put bottle on wall', i)

    carouse(10, None)
    carouse(5, 3)


From showell30 at yahoo.com  Fri Mar  5 00:12:17 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Thu, 4 Mar 2010 21:12:17 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org> 
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com> 
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
	<mailman.199.1267631220.23598.python-list@python.org> 
	<7xlje8lb9o.fsf@ruckus.brouhaha.com>
Message-ID: <e6f5c938-dfac-4c0c-8b4b-cbda2a670dcf@x1g2000prb.googlegroups.com>

On Mar 4, 12:52?am, Paul Rubin <no.em... at nospam.invalid> wrote:
> mk <mrk... at gmail.com> writes:
> > OK, but how? How would you make up e.g. for JSON's lack of comments?
>
> Modify the JSON standard so that "JSON 2.0" allows comments.

If you don't control the JSON standard, providing a compelling
alternative to JSON might be the best way to force JSON to accomodate
a wider audience.  It might just be that the people behind JSON
deliberately avoid comments, because it's not in the scope of the
problem they are trying to solve.  Hence another need for
alternatives.


> > OTOH, if YAML produces net benefit for as few as, say, 200 people in
> > real world, the effort to make it has been well worth it.
>
> Not if 200,000 other people have to deal with it but don't receive the
> benefit.
>

How many hundreds of thousands of people have had to deal with XML
without receiving its benefits?  Do well-established standards get an
exemption from the rule that software is not allowed to annoy non-
willing users of it?







From ken at seehart.com  Fri Mar  5 00:33:26 2010
From: ken at seehart.com (Ken Seehart)
Date: Thu, 04 Mar 2010 21:33:26 -0800
Subject: IMAP mail filters tool
Message-ID: <4B9097A6.2050600@seehart.com>

I'm thinking of possibly making a simple client-agnostic tool for 
filtering and processing IMAP email.  I'm a Thunderbird user, but I'm 
interested in a tool that is not client software specific.

So I am is checking for prior art.  Does anyone know of a filter tool 
with most of these features?

    * Written and customizable with python
    * IMAP based
    * Runs on client (i.e. without installing anything on the server)
    * Runs completely independent of client software (though could be
      launched from any email client that can support it)
    * Automatically suggests new rules based on manual movement of
      emails into folders (based on comparison of all header data across
      all existing folders)
    * Take arbitrary actions in response to rules (e.g. universally
      denying access to spam senders to all online cheese shops)
    * Capable of serving as a prototyping framework for things like spam
      filtering
    * General filtering functionality, not particularly focused on spam
    * Posts and updates rules to server via IMAP (i.e. by sending and
      automagically processing a special email message).

Typical work-flow would be aimed at users who like to automatically sort 
their email prior to reading it.  The goal is to have nearly all email 
sorted into folders so that most mail remaining in the Inbox is likely 
to be leftover spam missed by whatever spam filters are being used.  In 
other words, the filters tend to effectively serve as white lists.

Examples of unusual rules that don't seem to be supported by most email 
clients:

    * When you send an email, add the recipient to a filter such that
      email from that recipient goes to a "Unfiltered Replies" folder if
      it does not match any other filter.
    * Receiving email with certain fields matching certain regular
      expressions could automatically create a new folder and filter e.g.:
          o List-Id: "SF Bay Area Python group <baypiggies.python.org>"
            yields a new folder "Lists/SF Bay Area Python group" with a
            corresponding rule
          o X-Launchpad-Bug: "product=phatch; milestone=..." yields a
            new folder "Bugs/Phatch" with a corresponding rule
          o X-Bugzilla-Product: "Shrubbery" yields a new folder
            "Bugs/Shrubbery" with a corresponding rule


Thanks,
Ken

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From greg.ewing at canterbury.ac.nz  Fri Mar  5 00:36:06 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Fri, 05 Mar 2010 18:36:06 +1300
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <7xlje8lb9o.fsf@ruckus.brouhaha.com>
References: <mailman.34.1267409372.23598.python-list@python.org>	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<mailman.64.1267463648.23598.python-list@python.org>	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>	<7xljebyl56.fsf@ruckus.brouhaha.com>	<mailman.70.1267468806.23598.python-list@python.org>	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>	<7xhbozrfy4.fsf@ruckus.brouhaha.com>	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>	<7x635fdcth.fsf@ruckus.brouhaha.com>	<mailman.199.1267631220.23598.python-list@python.org>
	<7xlje8lb9o.fsf@ruckus.brouhaha.com>
Message-ID: <7vbiuqF4utU1@mid.individual.net>

Paul Rubin wrote:
> ReST was another solution in search of a problem.

I think the basic idea behind ReST is quite good, i.e.
understanding as markup various typographical conventions
that make sense in plain text, such as underlined
headings, bullets, numbered paragraphs.

Unfortunately it went overboard with a slew of cryptic
codes for footnotes, hyperlinks, etc. that nobody would
naturally think to use in a plain text document.

-- 
Greg


From showell30 at yahoo.com  Fri Mar  5 00:36:51 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Thu, 4 Mar 2010 21:36:51 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org> 
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com> 
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
	<mailman.199.1267631220.23598.python-list@python.org> 
	<7xlje8lb9o.fsf@ruckus.brouhaha.com> <7vbiuqF4utU1@mid.individual.net>
Message-ID: <696158a0-dccf-4fa2-b6ab-bb1c4cb2e219@m35g2000prh.googlegroups.com>

On Mar 4, 9:36?pm, Gregory Ewing <greg.ew... at canterbury.ac.nz> wrote:
> Paul Rubin wrote:
> > ReST was another solution in search of a problem.
>
> I think the basic idea behind ReST is quite good, i.e.
> understanding as markup various typographical conventions
> that make sense in plain text, such as underlined
> headings, bullets, numbered paragraphs.
>
> Unfortunately it went overboard with a slew of cryptic
> codes for footnotes, hyperlinks, etc. that nobody would
> naturally think to use in a plain text document.
>

The same thing happened with YAML to a certain extent, from my
perspective.  YAML was never meant to be an exact alternative to XML,
but its basic premise was sound--use indentation for more elegant
syntax, and model its semantics more toward how data actually gets
used internally by scripting languages in particular.  But there is
also some featuritis with YAML that makes it hard to digest and
needlessly cumbersome to implement.

JSON is not perfect by any means, but I consider it to be a more
useful descendant of XML and YAML, even if it did not directly borrow
from either.  (YAML and JSON are certainly similar, but that could be
a coincidental convergence.)  Even if YAML itself has not been a
resounding success, it set the bar to a certain degree.


From aahz at pythoncraft.com  Fri Mar  5 01:00:50 2010
From: aahz at pythoncraft.com (Aahz)
Date: 4 Mar 2010 22:00:50 -0800
Subject: WANTED: A good name for the pair (args, kwargs)
References: <hmo94l$9hb$1@south.jnrs.ja.net>
	<mailman.284.1267707023.23598.python-list@python.org>
Message-ID: <hmq6mi$dfg$1@panix3.panix.com>

In article <mailman.284.1267707023.23598.python-list at python.org>,
Tim Chase  <python.list at tim.thechases.com> wrote:
>Jonathan Fine wrote:
>>
>> We can call a function fn using
>>      val = fn(*args, **kwargs)
>> 
>> I'm looking for a good name for the pair (args, kwargs).  Any suggestions?
>> 
>> For now I'll use argpair, but if anyone has a better idea, I'll use it.
>
>In the legacy of C and Java (okay, that doesn't carry _much_ weight
>with me), I'd go with "varargs" to refer to the pair of (args, kwargs)

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

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From nagle at animats.com  Fri Mar  5 01:35:45 2010
From: nagle at animats.com (John Nagle)
Date: Thu, 04 Mar 2010 22:35:45 -0800
Subject: NoSQL Movement?
In-Reply-To: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
Message-ID: <4b90a1f8$0$1629$742ec2ed@news.sonic.net>

Xah Lee wrote:
> recently i wrote a blog article on The NoSQL Movement
> at http://xahlee.org/comp/nosql.html
> 
> i'd like to post it somewhere public to solicit opinions, but in the
> 20 min or so, i couldn't find a proper newsgroup, nor private list
> that my somewhat anti-NoSQL Movement article is fitting.

    Too much rant, not enough information.

    There is an argument against using full relational databases for
some large-scale applications, ones where the database is spread over
many machines.  If the database can be organized so that each transaction
only needs to talk to one database machine, the locking problems become
much simpler.  That's what BigTable is really about.

    For many web applications, each user has more or less their own data,
and most database activity is related to a single user.  Such
applications can easily be scaled up with a system that doesn't
have inter-user links.  There can still be inter-user references,
but without a consistency guarantee.  They may lead to dead data,
like Unix/Linux symbolic links.  This is a mechanism adequate
for most "social networking" sites.

    There are also some "consistent-eventually" systems, where a query
can see old data.  For non-critical applications, those can be
very useful.  This isn't a SQL/NoSQL thing; MySQL asynchronous
replication is a "consistent-eventually" system.  Wikipedia uses
that for the "special" pages which require database lookups.

    If you allow general joins across any tables, you have to have all
the very elaborate interlocking mechanisms of a distributed database.
The serious database systems (MySQL Cluster and Oracle, for example)
do offer that, but there are usually
substantial complexity penalties, and the databases have to be carefully
organized to avoid excessive cross-machine locking.  If you don't need
general joins, a system which doesn't support them is far simpler.

    					John Nagle


From greg.ewing at canterbury.ac.nz  Fri Mar  5 01:54:48 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Fri, 05 Mar 2010 19:54:48 +1300
Subject: NoSQL Movement?
In-Reply-To: <Xns9D31C31E6FFA3duncanbooth@127.0.0.1>
References: <Xns9D318550EF1D6duncanbooth@127.0.0.1>
	<mailman.289.1267714060.23598.python-list@python.org>
	<Xns9D31C31E6FFA3duncanbooth@127.0.0.1>
Message-ID: <7vbnieFovtU1@mid.individual.net>

Duncan Booth wrote:
> Did I mention that bigtable doesn't require you to have the same 
> columns in every record? The main use of bigtable (outside of Google's 
> internal use) is Google App Engine and that apparently uses one table.
> 
> Not one table per application, one table total. It's a big table.

Seems to me in that situation the term "table" ceases to
have any meaning. If every record can have its own unique
structure, and data from completely unrelated applications
can all be thrown in together, there's no more reason to
call it a "table" than, say, "file", "database" or "big
pile of data".

-- 
Greg


From news123 at free.fr  Fri Mar  5 02:21:30 2010
From: news123 at free.fr (News123)
Date: Fri, 05 Mar 2010 08:21:30 +0100
Subject: _winreg and accessing registry settings of another user
In-Reply-To: <917f4593-f50e-424c-a21b-04c376e77164@33g2000yqj.googlegroups.com>
References: <4b90252b$0$17806$426a34cc@news.free.fr>
	<917f4593-f50e-424c-a21b-04c376e77164@33g2000yqj.googlegroups.com>
Message-ID: <4b90b0fa$0$8332$426a74cc@news.free.fr>

Mensanator wrote:
> On Mar 4, 3:24 pm, News123 <news... at free.fr> wrote:
>> Hi,
>>
>> I have administrator privilege  on a window host and would like to write
>> a script setting some registry entries for other users.
> 
> Why? Are you writing a virus?
> 
Writing a virus in python???? Why not? though I didn't think about it as
ideal choice of implementing viruses.
For my script to run I have to run it explicitly as administrator
(as being required by Vista / Win7).


My script shall be part of installing and configuring a PC with some
default settings with the minimal amount of human administrator
interactions.

The steps:
- install windows
- install python
- setup one admin account and one or more user accounts (without admin
privileges)
- run a script, that preconfigures registry settings for some users.

As mentioned before I see at least two possible ways and achieving this
but lack information for either.


1.) run a sub process or thread as another user (the user wouldn't even
have a password during the installation phase) and change the registry
from this thread. I have no experience of running 'suid' under windows.


2.) being able to load the 'hive' of another user into the registry and
be therefore able to change his settings. I didn't find a function
allowing _winreg to load additional 'hives'



bye


N


From greg.ewing at canterbury.ac.nz  Fri Mar  5 02:33:44 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Fri, 05 Mar 2010 20:33:44 +1300
Subject: Generic singleton
In-Reply-To: <mailman.242.1267650721.23598.python-list@python.org>
References: <mailman.222.1267642515.23598.python-list@python.org>	<m2iq9d197a.fsf@googlemail.com>
	<mailman.242.1267650721.23598.python-list@python.org>
Message-ID: <7vbprcF49gU1@mid.individual.net>

mk wrote:

> Or I could make my life simpler and use global variable. :-)

Indeed. You actually *have* a global variable already, you've
just hidden it inside another object. That doesn't make it any
less global, though.

If you want to defer creation of the object until the first
time it's used, use a function that creates an instance the
first time it's called. Your Singleton class is really just
an overly elaborate way of implementing such a function.

-- 
Greg


From no.email at nospam.invalid  Fri Mar  5 02:46:46 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Thu, 04 Mar 2010 23:46:46 -0800
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org>
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
	<mailman.199.1267631220.23598.python-list@python.org>
	<7xlje8lb9o.fsf@ruckus.brouhaha.com>
	<e6f5c938-dfac-4c0c-8b4b-cbda2a670dcf@x1g2000prb.googlegroups.com>
Message-ID: <7xvddbqkgp.fsf@ruckus.brouhaha.com>

Steve Howell <showell30 at yahoo.com> writes:
>> Modify the JSON standard so that "JSON 2.0" allows comments.
>
> If you don't control the JSON standard, providing a compelling
> alternative to JSON might be the best way to force JSON to accomodate
> a wider audience. 

Ehh, either the JSON standardizers care about this issue or else they
don't.  JSON (as currently defined) is a machine-to-machine
serialization format and just isn't that good a choice for handwritten
files.  Adding a comment specification is a small perturbation that
might be accepted into the standard, but a big departure like RSON is a
whole nother creature.

> How many hundreds of thousands of people have had to deal with XML
> without receiving its benefits?  Do well-established standards get an
> exemption from the rule that software is not allowed to annoy non-
> willing users of it?

We already have to deal with XML.  So using XML for config files doesn't
require anyone to deal with any lousy formats that they didn't have to
deal with before.  So the basic answer to your question about
well-established standards is yes: one annoying but standardized format
is better than multiple annoying unstandardized ones.


From no.email at nospam.invalid  Fri Mar  5 02:50:15 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Thu, 04 Mar 2010 23:50:15 -0800
Subject: Failure in test_hashlib.py and test_hmac.py
References: <175865db-f64a-4633-8e36-ab4a5a5eaccf@x22g2000yqx.googlegroups.com>
Message-ID: <7xr5nzqkaw.fsf@ruckus.brouhaha.com>

Chris Lieb <chris.lieb at gmail.com> writes:
> I am building Python 2.6.4 on a shared server and am encountering test
> failures in test_hashlib.py and test_hmac.py,

You should certainly file a bug report (bugs.python.org).  If you want
to debug it yourself and include a patch, that's great.  Otherwise, just
file the report.

    In the case of test_hashlib.py, it segfaulted on the first sha512 test
    when I didn't have the debugging options enabled.  Only after enabling
    debugging did I get FAIL's for the sha512 tests.

    Does anyone know what is causing these failures?

Please be precise about the hw and compiler versions.


From stefan_ml at behnel.de  Fri Mar  5 03:03:36 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 05 Mar 2010 09:03:36 +0100
Subject: Partly erratic wrong behaviour, Python 3, lxml
In-Reply-To: <qotlje7ydd4.fsf@ruuvi.it.helsinki.fi>
References: <qotr5o0xt3l.fsf@ruuvi.it.helsinki.fi>	<mailman.308.1267729874.23598.python-list@python.org>
	<qotlje7ydd4.fsf@ruuvi.it.helsinki.fi>
Message-ID: <hmqdso$ubl$1@dough.gmane.org>

Jussi Piitulainen, 04.03.2010 22:40:
> Stefan Behnel writes:
>> Jussi Piitulainen, 04.03.2010 11:46:
>>> I am observing weird semi-erratic behaviour that involves Python 3
>>> and lxml, is extremely sensitive to changes in the input data, and
>>> only occurs when I name a partial result. I would like some help
>>> with this, please. (Python 3.1.1; GNU/Linux; how do I find lxml
>>> version?)
>>
>> Here's how to find the version:
>>
>> http://codespeak.net/lxml/FAQ.html#i-think-i-have-found-a-bug-in-lxml-what-should-i-do
>
> Ok, thank you. Here's the results:
>
> >>> print(et.LXML_VERSION, et.LIBXML_VERSION,
> ...       et.LIBXML_COMPILED_VERSION, et.LIBXSLT_VERSION,
> ...       et.LIBXSLT_COMPILED_VERSION)
> (2, 2, 4, 0) (2, 6, 26) (2, 6, 26) (1, 1, 17) (1, 1, 17)

I can't reproduce this with the latest lxml trunk (and Py3.2 trunk) and 
libxml2 2.7.6, even after running your test script for quite a while. I'd 
try to upgrade the libxml2 version.

Stefan



From lipun4u at gmail.com  Fri Mar  5 03:04:13 2010
From: lipun4u at gmail.com (asit)
Date: Fri, 5 Mar 2010 00:04:13 -0800 (PST)
Subject: indentation error
Message-ID: <f1e05b1f-3812-490a-9e6d-4a83aef7fe1d@q2g2000pre.googlegroups.com>

Consider the following code

import stat, sys, os, string, commands

try:
    pattern = raw_input("Enter the file pattern to search for :\n")
    commandString = "find " + pattern
    commandOutput = commands.getoutput(commandString)
    findResults = string.split(commandOutput, "\n")
    print "Files : "
    print commandOutput
    print "============================="
    for file in findResults:
        mode = stat.S_IMODE(os.lstat(file)[stat.ST_MODE])
        print "\nPermissions for file", file, ":"
        for level in "USR", "GRP", "OTH":
            for perm in "R", "W", "X":
                if mode & getattr(stat,"S_I"+perm+level):
                    print level, " has ", perm, " permission"
                else:
                    print level, " does NOT have ", perm, "
permission"
except:
    print "There was a problem - check the message above"


According to me, indentation is ok. but the python interpreter gives
an indentation error

[asit ~/py] $ python search.py
  File "search.py", line 7
    findResults = string.split(commandOutput, "\n")
                                                  ^
IndentationError: unindent does not match any outer indentation level


From steve at REMOVE-THIS-cybersource.com.au  Fri Mar  5 03:05:16 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 08:05:16 GMT
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org>
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
	<mailman.199.1267631220.23598.python-list@python.org>
	<7xlje8lb9o.fsf@ruckus.brouhaha.com> <7vbiuqF4utU1@mid.individual.net>
Message-ID: <4b90bb3c$0$27863$c3e8da3@news.astraweb.com>

On Fri, 05 Mar 2010 18:36:06 +1300, Gregory Ewing wrote:

> Paul Rubin wrote:
>> ReST was another solution in search of a problem.
> 
> I think the basic idea behind ReST is quite good, i.e. understanding as
> markup various typographical conventions that make sense in plain text,
> such as underlined headings, bullets, numbered paragraphs.
> 
> Unfortunately it went overboard with a slew of cryptic codes for
> footnotes, hyperlinks, etc. that nobody would naturally think to use in
> a plain text document.


I use footnotes all the time[1] in plain text documents and emails. I 
don't think there's anything bizarre about it at all.






[1] When I say "all the time", I actually mean occasionally.


-- 
Steven


From jimgardener at gmail.com  Fri Mar  5 03:05:18 2010
From: jimgardener at gmail.com (jimgardener)
Date: Fri, 5 Mar 2010 00:05:18 -0800 (PST)
Subject: comparing two lists
Message-ID: <d817b4e1-192b-40e6-9a9d-75c3cbbd4ccd@t31g2000prh.googlegroups.com>

hi
I have two lists of names.I need to find the difference between these
two lists.I tried to do it using sets.But I am wondering if there is a
better way to do it.Please tell me if there is a more elegant way.
thanks,
jim

my code snippet follows..

oldlst=['jon','arya','ned','bran']
newlst=['jaime','jon','cersei']

newlyadded=set(newlst)-set(oldlst)
removed=set(oldlst)-set(newlst)
unchanged=set(oldlst)& set(newlst)
print '%d were newly added= %s'%(len(newlyadded),list(newlyadded))
print '%d were removed=%s'%(len(removed),list(removed))
print '%d were unchanged=%s'%(len(unchanged),list(unchanged))

this produces the output
--------------
2 were newly added= ['jaime', 'cersei']
3 were removed=['ned', 'arya', 'bran']
1 were unchanged=['jon']


From greg.ewing at canterbury.ac.nz  Fri Mar  5 03:10:01 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Fri, 05 Mar 2010 21:10:01 +1300
Subject: Passing FILE * types using ctypes
In-Reply-To: <bac1318c-d5a2-4dfc-a716-2977959f7a06@b30g2000yqd.googlegroups.com>
References: <a83319d7-c199-4532-9816-d002f7fd7914@q16g2000yqq.googlegroups.com>
	<bac1318c-d5a2-4dfc-a716-2977959f7a06@b30g2000yqd.googlegroups.com>
Message-ID: <7vbrveFegeU1@mid.individual.net>

Francesco Bochicchio wrote:

> Python file objects have a method fileno() whic returns the 'C file
> descriptor', i.e. the number used by low level IO in python as well as
> in C.
> I would use this as interface between python and C and then in the C
> function using fdopen to get a FILE * for an already open file for
> which you have a file descriptor.

But note that this will be a *new* stdio file buffer
attached to the same file descriptor, not the same one
that the Python file object is using. This may or may
not be a problem depending on what you're trying to
do.

If you need the same FILE * that Python is using, you
may need to use ctypes to extract it out of the file
object.

-- 
Greg


From greg.ewing at canterbury.ac.nz  Fri Mar  5 03:25:47 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Fri, 05 Mar 2010 21:25:47 +1300
Subject: Docstrings considered too complicated
In-Reply-To: <4b9072b2$0$27863$c3e8da3@news.astraweb.com>
References: <20100224212303.242222c6@geekmail.INVALID>	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>	<20100227191040.6c77f2d8@geekmail.INVALID>	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>	<20100301182255.3de59bc6@geekmail.INVALID>	<mailman.66.1267465347.23598.python-list@python.org>	<20100301212954.7aa0b99d@geekmail.INVALID>
	<87eik3zmi8.fsf@benfinney.id.au>	<20100302184056.743a71e7@geekmail.INVALID>	<mailman.129.1267553139.23598.python-list@python.org>	<20100302225156.67171851@geekmail.INVALID>
	<877hpuxpdf.fsf@benfinney.id.au>	<7v6ae4Ff37U1@mid.individual.net>	<pan.2010.03.03.05.48.49@REMOVE.THIS.cybersource.com.au>	<7v9g9qF1nkU1@mid.individual.net>
	<4b9072b2$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <7vbssvFjgcU1@mid.individual.net>

Steven D'Aprano wrote:

> (a) Can we objectively judge the goodness of code, or is it subjective?
> 
> (b) Is goodness of code quantitative, or is it qualitative?

Yes, I'm not really talking about numeric vs. non-numeric,
but objective vs. subjective. The measurement doesn't have
to yield a numeric result, it just has to be doable by some
objective procedure. If you can build a machine to do it,
then it's objective. If you have to rely on the judgement of
a human, then it's subjective.

> But we can make quasi-objective judgements, by averaging out all the 
> individual quirks of subjective judgement:
> 
> (1) Take 10 independent judges who are all recognised as good Python 
> coders by their peers, and ask them to give a score of 1-5 for the 
> quality of the comments...

Yes, but this is an enormous amount of effort to go to, and
at the end of the day, the result is only reliable in a
statistical sense.

This still seems to me to be qualitatively different from
something like testing the tensile strength of a piece of
steel. You can apply a definite procedure and obtain a
definite result, and no human judgement is required at all.

-- 
Greg


From mjoachimiak at gmail.com  Fri Mar  5 03:30:49 2010
From: mjoachimiak at gmail.com (Michael Joachimiak)
Date: Fri, 5 Mar 2010 10:30:49 +0200
Subject: ImportError: No module named glib
Message-ID: <7c857e8c1003050030x39b75c98veace4ef8eebe606a@mail.gmail.com>

I am too new to python.
If anybody has an idea what to do please help.
when I use

import glib

in my code I get this:

>>> import glib
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named glib

:~$ python -V
Python 2.6.4

/usr/lib/libpyglib-2.0-python2.6.so.0.0.0 exists in version 2.18.0-0ubuntu2

:~$ pkg-config glib-2.0 --cflags --libs
-I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include  -lglib-2.0


From eckhardt at satorlaser.com  Fri Mar  5 03:32:17 2010
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Fri, 05 Mar 2010 09:32:17 +0100
Subject: indentation error
References: <f1e05b1f-3812-490a-9e6d-4a83aef7fe1d@q2g2000pre.googlegroups.com>
Message-ID: <h5s667-ed3.ln1@satorlaser.homedns.org>

asit wrote:
>     pattern = raw_input("Enter the file pattern to search for :\n")
>     commandString = "find " + pattern
>     commandOutput = commands.getoutput(commandString)
>     findResults = string.split(commandOutput, "\n")
>     print "Files : "
>     print commandOutput
>     print "============================="
>     for file in findResults:
>         mode = stat.S_IMODE(os.lstat(file)[stat.ST_MODE])
>         print "\nPermissions for file", file, ":"
>         for level in "USR", "GRP", "OTH":
>             for perm in "R", "W", "X":
>                 if mode & getattr(stat,"S_I"+perm+level):
>                     print level, " has ", perm, " permission"
>                 else:
>                     print level, " does NOT have ", perm, "
> permission"
[...]
> According to me, indentation is ok. but the python interpreter gives
> an indentation error
> 
> [asit ~/py] $ python search.py
>   File "search.py", line 7
>     findResults = string.split(commandOutput, "\n")
>                                                   ^
> IndentationError: unindent does not match any outer indentation level

Hard to tell, since your posting was already line-broken which already
changes the correctness. In any case, watch for tabs/spaces, many editors
have an option to display whitespace.

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From r1chardj0n3s at gmail.com  Fri Mar  5 03:39:49 2010
From: r1chardj0n3s at gmail.com (Richard Jones)
Date: Fri, 5 Mar 2010 19:39:49 +1100
Subject: 10th Python Game Programming Challenge in three weeks
Message-ID: <249b6faa1003050039n17e16b0p80ef8474c2d94167@mail.gmail.com>

The 10th Python Game Programming Challenge (http://pyweek.org/) will
run from the 28th of March to the 4th of April.

The PyWeek challenge:

- Invites entrants to write a game in one week from scratch either as
an individual or in a team,
- Is intended to be challenging and fun,
- Will hopefully increase the public body of game tools, code and expertise,
- Will let a lot of people actually finish a game, and
- May inspire new projects (with ready made teams!)

Come along and play, it's lots of fun :)


      Richard


From gh at ghaering.de  Fri Mar  5 03:40:50 2010
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Fri, 5 Mar 2010 09:40:50 +0100
Subject: [ANN] pysqlite 2.6.0 released
Message-ID: <496f9fbb1003050040k7c057e2s1941d216eb46ce5b@mail.gmail.com>

pysqlite 2.6.0 released
=======================

Release focus: Synchronize with sqlite3 module in Python trunk.

pysqlite is a DB-API 2.0-compliant database interface for SQLite.

SQLite is a in-process library that implements a self-contained,
serverless, zero-configuration, transactional SQL database
engine.

Go to http://pysqlite.googlecode.com/ for downloads, online documentation and
for reporting bugs.

Changes
=======

- pysqlite can now be built against Python versions without thread support
- PyDict_SetItem is now checked so you cannot shoot yourself in the
foot, even if you try to
- More checks for closed connections were added to avoid possible segfaults

Compatibility
=============

Warning:

pysqlite is not supported for Python < 2.5 any longer. This release still
builds against Python 2.3 and 2.4, but I won't bother with these in the future.


From vlastimil.brom at gmail.com  Fri Mar  5 03:50:03 2010
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Fri, 5 Mar 2010 09:50:03 +0100
Subject: comparing two lists
In-Reply-To: <d817b4e1-192b-40e6-9a9d-75c3cbbd4ccd@t31g2000prh.googlegroups.com>
References: <d817b4e1-192b-40e6-9a9d-75c3cbbd4ccd@t31g2000prh.googlegroups.com>
Message-ID: <9fdb569a1003050050y5705dd4bi6e757e59adb40d66@mail.gmail.com>

2010/3/5 jimgardener <jimgardener at gmail.com>:
> hi
> I have two lists of names.I need to find the difference between these
> two lists.I tried to do it using sets.But I am wondering if there is a
> better way to do it.Please tell me if there is a more elegant way.
> thanks,
> jim
>
> my code snippet follows..
>
> oldlst=['jon','arya','ned','bran']
> newlst=['jaime','jon','cersei']
>
> newlyadded=set(newlst)-set(oldlst)
> removed=set(oldlst)-set(newlst)
> unchanged=set(oldlst)& set(newlst)
> print '%d were newly added= %s'%(len(newlyadded),list(newlyadded))
> print '%d were removed=%s'%(len(removed),list(removed))
> print '%d were unchanged=%s'%(len(unchanged),list(unchanged))
>
> this produces the output
> --------------
> 2 were newly added= ['jaime', 'cersei']
> 3 were removed=['ned', 'arya', 'bran']
> 1 were unchanged=['jon']
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Hi,
I guess for lists with unique items and order insignificant this is
just fine; you may also check difflib, if it suits your needs; there
are multiple comparing and displaying possibilities, e.g.:

>>> import difflib
>>> print "\n".join(difflib.unified_diff(['jon','arya','ned','bran'], ['jaime','jon','cersei']))
---

+++

@@ -1,4 +1,3 @@

+jaime
 jon
-arya
-ned
-bran
+cersei
>>>

hth,
   vbr


From duncan.booth at invalid.invalid  Fri Mar  5 04:07:49 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 5 Mar 2010 09:07:49 GMT
Subject: NoSQL Movement?
References: <Xns9D318550EF1D6duncanbooth@127.0.0.1>
	<mailman.289.1267714060.23598.python-list@python.org>
	<Xns9D31C31E6FFA3duncanbooth@127.0.0.1>
	<7vbnieFovtU1@mid.individual.net>
Message-ID: <Xns9D325BBB95CDduncanbooth@127.0.0.1>

Gregory Ewing <greg.ewing at canterbury.ac.nz> wrote:

> Duncan Booth wrote:
>> Did I mention that bigtable doesn't require you to have the same 
>> columns in every record? The main use of bigtable (outside of 
Google's 
>> internal use) is Google App Engine and that apparently uses one 
table.
>> 
>> Not one table per application, one table total. It's a big table.
> 
> Seems to me in that situation the term "table" ceases to
> have any meaning. If every record can have its own unique
> structure, and data from completely unrelated applications
> can all be thrown in together, there's no more reason to
> call it a "table" than, say, "file", "database" or "big
> pile of data".
> 
I think it depends on how you look at things.

AppEngine uses a programming model which behaves very much as though you 
do have multiple tables: you use Django's programming model to wrap each 
record in a class, or you can use Gql query languages which looks very 
similar to SQL and again the class names appear in the place of table 
names.

So conceptually thinking of it as separate tables make a lot of sense, 
but the underlying implementation is apparently a single table where 
records simply have a type field that is used to instantiate the proper 
class on the Python side (and another hidden application field to 
prevent you accessing another application's data). Also of course 
records with the same type still may not all have the same columns if 
you change the class definition between runs, so even at this level they 
aren't tables in the strict SQL sense.

There may of course be other applications using bigtable where the 
bigtable(s) look much more like ordinary tables, but I don't know what 
they are.

>From your suggested terms, I'd agree you could call it a database rather 
than a table but I think it's too structured for "file" or "big pile of 
data" to be appropriate.

-- 
Duncan Booth http://kupuguy.blogspot.com


From magnicida at gmail.com  Fri Mar  5 04:37:04 2010
From: magnicida at gmail.com (Juan Pedro Bolivar Puente)
Date: Fri, 05 Mar 2010 11:37:04 +0200
Subject: NoSQL Movement?
In-Reply-To: <7bfeffcd-722e-4df4-8455-7710207d9c7e@a18g2000yqc.googlegroups.com>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<26bd4a5c-4d66-4597-a0ee-b4990f468e68@g26g2000yqn.googlegroups.com>
	<e0a86785-bb68-4977-8864-010ca4f71a6c@19g2000yqu.googlegroups.com>
	<hmooea$uga$1@news.bytemine.net>
	<7bfeffcd-722e-4df4-8455-7710207d9c7e@a18g2000yqc.googlegroups.com>
Message-ID: <4B90D0C0.7020508@gmail.com>

On 04/03/10 19:52, ccc31807 wrote:
> On Mar 4, 11:51 am, Juan Pedro Bolivar Puente <magnic... at gmail.com>
> wrote:
>> No, relations are data.
> 
> This depends on your definition of 'data.' I would say that
> relationships is information gleaned from the data.
> 
>> "Data is data" says nothing. Data is
>> information.
> 
> To me, data and information are not the same thing, and in particular,
> data is NOT information. To me, information consists of the sifting,
> sorting, filtering, and rearrangement of data that can be useful in
> completing some task. As an illustration, consider some very large
> collection of ones and zeros -- the information it contains depends on
> whether it's views as a JPEG, an EXE, XML, WAV, or other sort of
> information processing device. Whichever way it's processed, the
> 'data' (the ones and zeros) stay the same, and do not constitute
> 'information' in their raw state.
> 
>> Actually, all data are relations: relating /values/ to
>> /properties/ of /entities/. Relations as understood by the "relational
>> model" is nothing else but assuming that properties and entities are
>> first class values of the data system and the can also be related.
> 
> Well, this sort of illustrates my point. The 'values' of 'properties'
> relating to specific 'entities' depends on how one processes the data,
> which can be processed various ways. For example, 10000001 can either
> be viewed as the decimal number 65 or the alpha character 'A' but the
> decision as to how to view this value isn't inherent in the data
> itself, but only as an artifact of our use of the data to turn it into
> information.
> 

Well, it depends as you said on the definition of information; actually
your definition of data fits into the information-theorical definition
of information as sequence of symbols... But I understand that in other
context /information/ can also mean the next level of abstraction on top
of /data/, in the same way as /knowledge/ is the next level of
abstraction on top of information; lets ground or basis on that.

In any case, your definition and George's still support my point of view
where relations are data: they are stored in the computer as a sequence
of ones and zeroes and is indistinguishable from any other thing in the
data space in that sense. Of course, it is a key data to be able to
recover information and specially to add new information consistently to
the data storage... That SQL includes special syntax for manipulating
relations should not hide this fact; and one can still query the
relational information in the same way one would query non-relational
data in most DBMS anyway...

Anyway I'm sorry for drifting the conversation away... Going back to the
main topic, I agree with the general view on this thread that relational
databases (information-bases ? ;) and non-relational ones are there to
do some different jobs. It is just by carefully examining a problem that
we can define which one fits it better; with relational databases having
the clear advantage that is mathematically grounded basis makes its
fitness for most problems quite clear, while the preference for
non-relational systems is a more technical and empirical problem of the
trade-offs of consistency vs scalability and so on.

JP



From no.email at nospam.invalid  Fri Mar  5 04:45:54 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Fri, 05 Mar 2010 01:45:54 -0800
Subject: loop over list and process into groups
References: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>
	<5e9126f7-f9e2-4c38-8dd5-dc174204fd71@d27g2000yqf.googlegroups.com>
Message-ID: <7xhbov2jal.fsf@ruckus.brouhaha.com>

lbolla <lbolla at gmail.com> writes:
> for k, g in groupby(clean_up(data) , key=lambda s: s.startswith('VLAN')):
> 	if k:
> 		key = list(g)[0].replace('VLAN','')

This is the nicest solution, I think.  Mine was more cumbersome.


From mail at timgolden.me.uk  Fri Mar  5 04:59:17 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 05 Mar 2010 09:59:17 +0000
Subject: _winreg and accessing registry settings of another user
In-Reply-To: <4b90b0fa$0$8332$426a74cc@news.free.fr>
References: <4b90252b$0$17806$426a34cc@news.free.fr>	<917f4593-f50e-424c-a21b-04c376e77164@33g2000yqj.googlegroups.com>
	<4b90b0fa$0$8332$426a74cc@news.free.fr>
Message-ID: <4B90D5F5.4040802@timgolden.me.uk>

On 05/03/2010 07:21, News123 wrote:
> My script shall be part of installing and configuring a PC with some
> default settings with the minimal amount of human administrator
> interactions.
>
> The steps:
> - install windows
> - install python
> - setup one admin account and one or more user accounts (without admin
> privileges)
> - run a script, that preconfigures registry settings for some users.

> 2.) being able to load the 'hive' of another user into the registry and
> be therefore able to change his settings. I didn't find a function
> allowing _winreg to load additional 'hives'


You can use a combination of the win32security, win32api and win32profile
modules from the pywin32 package for this:

<code>
import win32security
import win32api
import win32profile

username = "USERNAME"
domain = "DOMAIN"
password = "PASSWORD"

hUser = win32security.LogonUser (
   username,
   domain,
   password,
   win32security.LOGON32_LOGON_NETWORK,
   win32security.LOGON32_PROVIDER_DEFAULT
)
hReg = win32profile.LoadUserProfile (
   hUser,
   {"UserName" : "fozrestore"}
)
try:
   print win32api.RegEnumKeyExW (hReg)
finally:
   win32profile.UnloadUserProfile (hUser, hReg)

</code>

TJG


From phil at freehackers.org  Fri Mar  5 05:01:06 2010
From: phil at freehackers.org (BlueBird)
Date: Fri, 5 Mar 2010 02:01:06 -0800 (PST)
Subject: SOAP 1.2 Python client ?
References: <5a36bd30-6cbd-48ca-9ca3-dc34c97e03c0@o30g2000yqb.googlegroups.com>
	<mailman.227.1267644925.23598.python-list@python.org>
Message-ID: <fcaa9201-5e94-4cf3-af6e-78c1bbcb6144@t20g2000yqe.googlegroups.com>

On 3 mar, 20:35, Stefan Behnel <stefan... at behnel.de> wrote:
> BlueBird, 03.03.2010 17:32:
>
> > I am looking for a SOAP 1.2 python client. To my surprise, it seems
> > that this does not exist. Does anybody know about this ?
>
> SOAP may be an overly bloated protocol, but it's certainly not black magic.
> It's not hard to do manually if you really need to:
>
> http://effbot.org/zone/element-soap.htm

But this requires a goog knowloedge of SOAP, in order to parse
everything correctly. The reason I want to use a ready-made client is
that I have about zero knowledge about SOAP, and even more in the
differences between SOAP 1.1 and 1.2 .

cheers,

Philippe


From aurelien.gourrier at yahoo.fr  Fri Mar  5 05:35:42 2010
From: aurelien.gourrier at yahoo.fr (=?iso-8859-1?Q?Aur=E9_Gourrier?=)
Date: Fri, 5 Mar 2010 10:35:42 +0000 (GMT)
Subject: Proper way to return an instance of a class from a class method ?
Message-ID: <918065.487.qm@web23104.mail.ird.yahoo.com>

Dear all,

I have what will probably sound as stupid questions for experienced Python users... which I am not, hence my seeking for some help.

------------
QUESTION 1:
I've implemeted a class which defines a container with 2 lists of data (with some specific format).
Some of the methods simply transform these data and therefore return a new container of 2 lists.
I want to be able to use these results without having to re-instanciate them, so I return them as instances of the class:

class MyClass:
    def __init__(self, data):
        #various checks for the format and content of data (data = [x,y] where x and y are 2 lists of floats)
        self.data = data
        
    def transformdata(self):
        newdata = transform(data)
        return MyClass(newdata)

In this way I can do:

x = list1
y = list2
data = MyClass([x,y])
moddata = data.transformdata()
moddata2 = moddata.transformdata()

Is that the correct way to go (i.e. is this pythonic) ? What I want to avoid is:

moddata = data.transformdata()
moddata2 = MyClass(moddata).transformdata()

------------
QUESTION 2:
If I go this way, I have a second problem: if I create a new class which inherits from the previous, I would expect/like the methods from the initial class to return instances from the new class:

class MyClass2(MyClass):

    def othermethods(self):
        return MyClass2(whatever)

Then I get:

x = list1
y = list2
data = MyClass2([x,y])
finaldata = data.transformdata()

My problem is that finaldata is (of course) an instance of MyClass and not MyClass2. How do I deal with this ?

All help will be much appreciated...

Cheers,

Aur?


      
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From jeanmichel at sequans.com  Fri Mar  5 05:44:57 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 05 Mar 2010 11:44:57 +0100
Subject: Evaluate my first python script, please
In-Reply-To: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
Message-ID: <4B90E0A9.6000600@sequans.com>

Pete Emerson wrote:
> I've written my first python program, and would love suggestions for
> improvement.
>
> I'm a perl programmer and used a perl version of this program to guide
> me. So in that sense, the python is "perlesque"
>
> This script parses /etc/hosts for hostnames, and based on terms given
> on the command line (argv), either prints the list of hostnames that
> match all the criteria, or uses ssh to connect to the host if the
> number of matches is unique.
>
> I am looking for advice along the lines of "an easier way to do this"
> or "a more python way" (I'm sure that's asking for trouble!) or
> "people commonly do this instead" or "here's a slick trick" or "oh,
> interesting, here's my version to do the same thing".
>
> I am aware that there are performance improvements and error checking
> that could be made, such as making sure the file exists and is
> readable and precompiling the regular expressions and not calculating
> how many sys.argv arguments there are more than once. I'm not hyper
> concerned with performance or idiot proofing for this particular
> script.
>
> Thanks in advance.
>
> ########################################################
> #!/usr/bin/python
>
> import sys, fileinput, re, os
>
> filename = '/etc/hosts'
>
> hosts = []
>
> for line in open(filename, 'r'):
> 	match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line)
> 	if match is None or re.search('^(?:float|localhost)\.', line):
> continue
> 	hostname = match.group(1)
> 	count = 0
> 	for arg in sys.argv[1:]:
> 		for section in hostname.split('.'):
> 			if section == arg:
> 				count = count + 1
> 				break
> 	if count == len(sys.argv) - 1:
> 		hosts.append(hostname)
>
> if len(hosts) == 1:
> 	os.system("ssh -A " + hosts[0])
> else:
> 	print '\n'.join(hosts)
>   
You've already been given good advices.
Unlike some of those, I don't think using regexp an issue in any way. 
Yes they are not readable, for sure, I 100% agree to that statement, but 
you can make them readable very easily.

# not readable
match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line)


# readable
match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line) # match 
'192.168.200.1   (foo123)'

I gladly understand ppl that are not willing to use regexp (or as last 
resort), but for a perl guy, that should not be an issue.

JM



From bruno.42.desthuilliers at websiteburo.invalid  Fri Mar  5 05:54:28 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 05 Mar 2010 11:54:28 +0100
Subject: NoSQL Movement?
In-Reply-To: <mailman.270.1267671204.23598.python-list@python.org>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>	<mailman.256.1267655008.23598.python-list@python.org>	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
	<mailman.270.1267671204.23598.python-list@python.org>
Message-ID: <4b90e2d0$0$10096$426a34cc@news.free.fr>

Philip Semanchuk a ?crit :
> 
> On Mar 3, 2010, at 5:41 PM, Avid Fan wrote:
> 
>> Jonathan Gardner wrote:
>>
>>> I see it as a sign of maturity with sufficiently scaled software that
>>> they no longer use an SQL database to manage their data. At some point
>>> in the project's lifetime, the data is understood well enough that the
>>> general nature of the SQL database is unnecessary.
>>
>> I am really struggling to understand this concept.
>>
>> Is it the normalised table structure that is in question or the query 
>> language?
>>
>> Could you give some sort of example of where SQL would not be the way 
>> to go.   The only things I can think of a simple flat file databases.
> 
> Well, Zope is backed by an object database rather than a relational one.

And it ended up being a *major* PITA on all Zope projects I've worked on...


From mblume at socha.net  Fri Mar  5 05:54:49 2010
From: mblume at socha.net (mblume)
Date: 05 Mar 2010 10:54:49 GMT
Subject: ImportError: No module named glib
References: <mailman.327.1267777872.23598.python-list@python.org>
Message-ID: <4b90e2f9$0$4046$5402220f@news.sunrise.ch>

Am Fri, 05 Mar 2010 10:30:49 +0200 schrieb Michael Joachimiak:

> I am too new to python.
> If anybody has an idea what to do please help. when I use
> 
> import glib
> 
> in my code I get this:
> 
>>>> import glib
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> ImportError: No module named glib
> 

Shot in the dark: maybe "import pyglib"?
Hint: you can look around in /usr/lib/python to see what files can be imported.

HTH
Martin


From azt113 at gmail.com  Fri Mar  5 06:39:54 2010
From: azt113 at gmail.com (Ines T)
Date: Fri, 5 Mar 2010 11:39:54 +0000 (UTC)
Subject: Selecting MAX from a list
Message-ID: <loom.20100305T123510-94@post.gmane.org>

I need to select a maximum number from a list and then call the variable that
identifies that number, for example:
x1,x2=1, y1,y2=4, z1,z2=3
So I need first to find 4 and then to take y to do additional operations as y-z.
I will appreciate your SOON help!



From santhosh.vkumar at gmail.com  Fri Mar  5 06:41:00 2010
From: santhosh.vkumar at gmail.com (Santhosh Kumar)
Date: Fri, 5 Mar 2010 17:11:00 +0530
Subject: Speech to Text
Message-ID: <404c076d1003050341w327ceec7x63cfb0c01469d35d@mail.gmail.com>

Hi All,
     I am trying to find is there is any way to covert "speech to Text" with
Python in UBUNTU. I googled whr I found Many Text to speech. Some one please
assist me.

-- 
With Regards,
Never Say No,
Santhosh V.Kumar
+919840411410
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From __peter__ at web.de  Fri Mar  5 06:46:54 2010
From: __peter__ at web.de (Peter Otten)
Date: Fri, 05 Mar 2010 12:46:54 +0100
Subject: ImportError: No module named glib
References: <mailman.327.1267777872.23598.python-list@python.org>
Message-ID: <hmqqu1$650$02$1@news.t-online.com>

Michael Joachimiak wrote:

> I am too new to python.
> If anybody has an idea what to do please help.
> when I use
> 
> import glib
> 
> in my code I get this:
> 
>>>> import glib
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> ImportError: No module named glib
> 
> :~$ python -V
> Python 2.6.4
> 
> /usr/lib/libpyglib-2.0-python2.6.so.0.0.0 exists in version
> 2.18.0-0ubuntu2
> 
> :~$ pkg-config glib-2.0 --cflags --libs
> -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include  -lglib-2.0

After the following random walk through my system

$ python
Python 2.6.4 (r264:75706, Dec  7 2009, 18:43:55)
[GCC 4.4.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import glib
>>> glib.__file__
'/usr/lib/pymodules/python2.6/gtk-2.0/glib/__init__.pyc'

In the above __init__.py:
...
from glib._glib import *
_PyGLib_API = _glib._PyGLib_API

del _glib
...

>>> import sys
>>> sys.modules["glib._glib"]
<module 'glib._glib' from 
'/usr/lib/pymodules/python2.6/gtk-2.0/glib/_glib.so'>
>>>
$ dpkg -S _glib.so
python-gobject: /usr/lib/pyshared/python2.5/gtk-2.0/glib/_glib.so
python-gobject: /usr/lib/pyshared/python2.6/gtk-2.0/glib/_glib.so
$

... I believe that you have to install the python-gobject package.

Peter



From steve at REMOVE-THIS-cybersource.com.au  Fri Mar  5 06:48:35 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 11:48:35 GMT
Subject: indentation error
References: <f1e05b1f-3812-490a-9e6d-4a83aef7fe1d@q2g2000pre.googlegroups.com>
Message-ID: <4b90ef93$0$27863$c3e8da3@news.astraweb.com>

On Fri, 05 Mar 2010 00:04:13 -0800, asit wrote:

> Consider the following code
[snip]
> According to me, indentation is ok. but the python interpreter gives an
> indentation error

You can trust the interpreter. There *is* an indentation error. Most 
likely you have mixed spaces and tabs. Try:

python -t -t search.py

instead. (Yes, -t twice.)

On an unrelated note, your code snippet shows a very poor coding style. 
Firstly, bare "except" clauses are VERY bad practice: it will mask bugs 
in your code. Secondly, you should wrap the smallest amount of code in 
the try block as you need.

Something like this is probably better:


pattern = raw_input("Enter the file pattern to search for :\n")
commandString = "find " + pattern
commandOutput = commands.getoutput(commandString)
findResults = string.split(commandOutput, "\n")
print "Files : "
print commandOutput
print "============================="
for file in findResults:
    try:
        mode = stat.S_IMODE(os.lstat(file)[stat.ST_MODE])
    except (IOError, OSError):
        # Print a useless error message so your users will hate you.
        print "There was a problem with %s" % file
        continue
    print "\nPermissions for file", file, ":"
    for level in "USR", "GRP", "OTH":
        for perm in "R", "W", "X":
            if mode & getattr(stat,"S_I"+perm+level):
                print level, " has ", perm, " permission"
            else:
                print level, " does NOT have ", perm, "permission"
    

-- 
Steven


From anand.shashwat at gmail.com  Fri Mar  5 06:54:19 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Fri, 5 Mar 2010 17:24:19 +0530
Subject: Selecting MAX from a list
In-Reply-To: <loom.20100305T123510-94@post.gmane.org>
References: <loom.20100305T123510-94@post.gmane.org>
Message-ID: <d4ab53de1003050354t5e252c24x4ce982e836abffdf@mail.gmail.com>

On Fri, Mar 5, 2010 at 5:09 PM, Ines T <azt113 at gmail.com> wrote:

> I need to select a maximum number from a list


use max()


> and then call the variable that
> identifies that number, for example:
> x1,x2=1, y1,y2=4, z1,z2=3
>

you mean x1 = y1 = 1 or x1, y1 = 1, 1 right ?


> So I need first to find 4 and then to take y to do additional operations as
> y-z.
>

Well, I guess you got the idea


> I will appreciate your SOON help!
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From mrkafk at gmail.com  Fri Mar  5 06:56:34 2010
From: mrkafk at gmail.com (mk)
Date: Fri, 05 Mar 2010 12:56:34 +0100
Subject: NoSQL Movement?
In-Reply-To: <4b90e2d0$0$10096$426a34cc@news.free.fr>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>	<mailman.256.1267655008.23598.python-list@python.org>	<BABjn.11012$pv.4575@news-server.bigpond.net.au>	<mailman.270.1267671204.23598.python-list@python.org>
	<4b90e2d0$0$10096$426a34cc@news.free.fr>
Message-ID: <hmqrhh$l1o$1@dough.gmane.org>

Bruno Desthuilliers wrote:
>> Well, Zope is backed by an object database rather than a relational one.
> 
> And it ended up being a *major* PITA on all Zope projects I've worked on...

Care to write a few sentences on nature of problems with zodb? I was 
flirting with the thought of using it on some project.

Regards,
mk



From clp2 at rebertia.com  Fri Mar  5 07:01:32 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 5 Mar 2010 04:01:32 -0800
Subject: Proper way to return an instance of a class from a class method ?
In-Reply-To: <918065.487.qm@web23104.mail.ird.yahoo.com>
References: <918065.487.qm@web23104.mail.ird.yahoo.com>
Message-ID: <50697b2c1003050401h466d7f36t63b5f713d5271e4f@mail.gmail.com>

On Fri, Mar 5, 2010 at 2:35 AM, Aur? Gourrier
<aurelien.gourrier at yahoo.fr> wrote:
<snip>
> QUESTION 2:
> If I go this way, I have a second problem: if I create a new class which
> inherits from the previous, I would expect/like the methods from the initial
> class to return instances from the new class:
>
> class MyClass2(MyClass):
>
> ??? def othermethods(self):
> ??? ??? return MyClass2(whatever)
>
> Then I get:
>
> x = list1
> y = list2
> data = MyClass2([x,y])
> finaldata = data.transformdata()
>
> My problem is that finaldata is (of course) an instance of MyClass and not
> MyClass2. How do I deal with this ?

Get the object's actual class at runtime and use that.

#in MyClass
def transformdata(self):
    newdata = transform(data)
    return self.__class__(newdata)

When called on an instance of the subclass, self.__class__ will be
MyClass2 and everything will work out.

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


From bruno.42.desthuilliers at websiteburo.invalid  Fri Mar  5 07:15:59 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 05 Mar 2010 13:15:59 +0100
Subject: Method / Functions - What are the differences?
In-Reply-To: <4b902338$0$31260$607ed4bc@cv.net>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
	<mailman.109.1267539415.23598.python-list@python.org>
	<hmk1mn$70u$1@newsreader3.netcologne.de>
	<4b8e4041$0$17447$426a34cc@news.free.fr>
	<hmlte9$d0f$1@dough.gmane.org>
	<mailman.205.1267633968.23598.python-list@python.org>
	<4b8e9660$0$21812$426a34cc@news.free.fr>
	<hmmrh4$644$1@newsreader3.netcologne.de>
	<4B8EF717.3070701@optimum.net> <4b902338$0$31260$607ed4bc@cv.net>
Message-ID: <4b90f5eb$0$9148$426a74cc@news.free.fr>

John Posner a ?crit :
> On 3/3/2010 6:56 PM, John Posner wrote:
>>
>> ... I was thinking
>> today about "doing a Bruno", and producing similar pieces on:
>>
>> * properties created with the @property decorator
>>
>> * the descriptor protocol
>>
>> I'll try to produce something over the next couple of days.
>>
> 
> Starting to think about a writeup on Python properties, I've discovered 
> that the official Glossary [1] lacks an entry for "property" -- it's 
> missing in both Py2 and Py3!
> 
> Here's a somewhat long-winded definition -- comments, please:
> 
> ---------------------------------------------
> An attribute, *a*, of an object, *obj*, is said to be implemented as a 
> property if the standard ways of accessing the attribute:
> 
>  * evaluation:      print obj.a
>  * assignment:      obj.a = 42
>  * deletion:        del obj.a
> 
> ... cause methods of a user-defined *property object* to be invoked.

Hmmm... a couple remarks:

1/ "property" is actually the name of a Python builtin type. It's also 
pretty much used in general OO litterature for what we name 
"attributes". So  I think it would be better to avoid confusion between 
"property" as the builtin type, "property" as synonym for attribute, and 
"property" as the more specific concept of "computed attribute" - which 
is what you're describing here.

As far as I'm concerned, I prefer to stick to "computed attribute" for 
the generic case, and only use "property" when the computed attribute is 
actually implemented using the builtin property type.

2/ depending on how the computed attribute is implemented, the 
computation needs not happen on ALL get/set/del access - you can have 
non-binding descriptors (that is, not implementing __set__).

Also, the "standard" access also include getattr(), setattr() and 
delattr() (might be worth a note).

> The 
> attribute 

/attribute/user-defined object/ here ?

> is created as a class attribute, not an instance attribute. 
> Example:
> 
>   class Widget:
>       # create "color" as class attribute, not within __init__()
>       color = <<property-object>>
> 
>       def __init__(self, ...):
>           # do not define "self.color" instance attribute

Yes you can, and it's even actually pretty common:

# example.py
from somewhere import RGBColor

class Foo(object):
    def _get_color(self):
        return str(self._color)
    def _set_color(self, val):
        self._color = RGBColor.from_string(val)
    color = property(fget=_get_color, fset=_set_color)

    def __init__(self, colorvalue):
        self.color = colorvalue


> The property object can be created with the built-in function 
> property(), 

It's actually a type, not a function.

> which in some cases can be coded as a decorator: @property. 
> The property object can also be an instance of a class that implements 
> the descriptor protocol.

The "property object" IS an instance of a class that implements the 
descriptor protocol. The property type is just a "generic" descriptor:

# naive (and incomplete) python implementation of the property type

class property(object):
     def __init__(self, fget, fset=None, fdel=None)
         self._fget = fget
         self._fset = fset
         self._fdel = fdel

    def __get__(self, instance, cls):
        if instance is None:
            return self
        return self._fget(instance)

    def __set__(self, instance, value):
        if not self._fset:
            raise AttributeError("can't set attribute")
        self._fset(instance, value)

    def __del__(self):
        if not self._fdel:
            raise AttributeError("can't delete attribute")
        self._fdel(instance)


As far as I'm concerned, I'd "plan" such a paper as:

"""
What's a property ? It's a computed attribute implemented using the 
builtin "property" type.

Ok, so far it doesn't help much. So
1/ what's a computed attribute, and
2/ what is the property type ?

1/ your above explanation about what's a computed attribute in general, 
then a brief explanation of how computed attributes are implemented in 
python -> IOW, the descriptor protocol

2/ my above snippet !-)

"""

I think the way you started explaining computed attributes wrt/ 
attribute access could be a pretty good way to explain the descriptor 
protocol, since the mapping from get/set/del access to __get__, __set__, 
and __del__ magic methods is then pretty obvious.

But YMMV of course, so by all mean feel free to discard all or parts of 
the above remarks !-)

HTH


From lbolla at gmail.com  Fri Mar  5 07:19:23 2010
From: lbolla at gmail.com (lbolla)
Date: Fri, 5 Mar 2010 04:19:23 -0800 (PST)
Subject: SOAP 1.2 Python client ?
References: <5a36bd30-6cbd-48ca-9ca3-dc34c97e03c0@o30g2000yqb.googlegroups.com>
	<mailman.227.1267644925.23598.python-list@python.org>
	<fcaa9201-5e94-4cf3-af6e-78c1bbcb6144@t20g2000yqe.googlegroups.com>
Message-ID: <13753751-d0af-48df-b78d-5b371109e05c@t41g2000yqt.googlegroups.com>

On Mar 5, 10:01?am, BlueBird <p... at freehackers.org> wrote:
> On 3 mar, 20:35, Stefan Behnel <stefan... at behnel.de> wrote:
>
> > BlueBird, 03.03.2010 17:32:
>
> > > I am looking for a SOAP 1.2 python client. To my surprise, it seems
> > > that this does not exist. Does anybody know about this ?
>
> > SOAP may be an overly bloated protocol, but it's certainly not black magic.
> > It's not hard to do manually if you really need to:
>
> >http://effbot.org/zone/element-soap.htm
>
> But this requires a goog knowloedge of SOAP, in order to parse
> everything correctly. The reason I want to use a ready-made client is
> that I have about zero knowledge about SOAP, and even more in the
> differences between SOAP 1.1 and 1.2 .
>
> cheers,
>
> Philippe


I use a thin custom-made python wrapper around gSoap[1], which is tens
of times faster than ZSI.
L.


[1] http://www.cs.fsu.edu/~engelen/soapdoc2.html


From jeanmichel at sequans.com  Fri Mar  5 07:20:04 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 05 Mar 2010 13:20:04 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <hmpu64$us8$1@dough.gmane.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>	<hmokot$uso$1@news.eternal-september.org>	<mailman.293.1267718664.23598.python-list@python.org>	<hmop33$rrj$1@news.eternal-september.org>	<mailman.303.1267723835.23598.python-list@python.org>	<6af3c613-3439-484b-83f1-49213f1ed574@k17g2000yqb.googlegroups.com>
	<hmpu64$us8$1@dough.gmane.org>
Message-ID: <4B90F6F4.5010202@sequans.com>

Robert Kern wrote:
> On 2010-03-04 15:12 , Mike Kent wrote:
>> On Mar 4, 12:30 pm, Robert Kern<robert.k... at gmail.com>  wrote:
>>
>>> He's ignorant of the use cases of the with: statement, true.
>>
>> <humor>  Ouch!  Ignorant of the use cases of the with statement, am I?
>> Odd, I use it all the time.</humor>
>
> No, I was referring to Jean-Michel, who was not familiar with the 
> with: statement.
>
>>> Given only your
>>> example of the with: statement, it is hard to fault him for thinking 
>>> that try:
>>> finally: wouldn't suffice.
>>
>> <humor>  Damn me with faint praise, will you?</humor>
>
> Also talking about Jean-Michel. :-)
>
I confirm, I am the ignoramus (what a strange word) in this story :-)

JM


From lbolla at gmail.com  Fri Mar  5 07:24:51 2010
From: lbolla at gmail.com (lbolla)
Date: Fri, 5 Mar 2010 04:24:51 -0800 (PST)
Subject: Selecting MAX from a list
References: <mailman.339.1267789512.23598.python-list@python.org>
Message-ID: <e49e1254-8c30-4fb4-82bf-e7ff9f664441@d2g2000yqa.googlegroups.com>

On Mar 5, 11:39?am, Ines T <azt... at gmail.com> wrote:
> I need to select a maximum number from a list and then call the variable that
> identifies that number, for example:
> x1,x2=1, y1,y2=4, z1,z2=3
> So I need first to find 4 and then to take y to do additional operations as y-z.

It's not clear what you are supposed to do, but wouldn't a combination
of "max" and "index" do?
x = [3,2,1,4,5,2,3]
max(x) # 5
x.index(5) # 4

> I will appreciate your SOON help!
And, by the way, politeness is free!


From alfps at start.no  Fri Mar  5 08:06:55 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Fri, 05 Mar 2010 14:06:55 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.331.1267778428.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>	<hmn03d$5r6$1@news.eternal-september.org>	<mailman.292.1267717742.23598.python-list@python.org>	<hmooo6$pg0$1@news.eternal-september.org>	<mailman.300.1267723245.23598.python-list@python.org>	<hmoul7$2i9$1@news.eternal-september.org>	<mailman.314.1267744631.23598.python-list@python.org>	<hmph3b$20o$1@news.eternal-september.org>
	<mailman.331.1267778428.23598.python-list@python.org>
Message-ID: <hmqvlk$j2i$1@news.eternal-september.org>

* Robert Kern:
> On 2010-03-04 17:52 , Alf P. Steinbach wrote:
>> * Robert Kern:
>>> On 2010-03-04 12:37 PM, Alf P. Steinbach wrote:
>>>> * Robert Kern:
>>>>> On 2010-03-04 10:56 AM, Alf P. Steinbach wrote:
>>>>>> * Robert Kern:
>>>>>>> On 2010-03-03 18:49 PM, Alf P. Steinbach wrote:
>>>> [snippety]
>>>>>>>
>>>>>>>> If you call the possibly failing operation "A", then that 
>>>>>>>> systematic
>>>>>>>> approach goes like this: if A fails, then it has cleaned up its own
>>>>>>>> mess, but if A succeeds, then it's the responsibility of the 
>>>>>>>> calling
>>>>>>>> code to clean up if the higher level (multiple statements) 
>>>>>>>> operation
>>>>>>>> that A is embedded in, fails.
>>>>>>>>
>>>>>>>> And that's what Marginean's original C++ ScopeGuard was designed
>>>>>>>> for,
>>>>>>>> and what the corresponding Python Cleanup class is designed for.
>>>>>>>
>>>>>>> And try: finally:, for that matter.
>>>>>>
>>>>>> Not to mention "with".
>>>>>>
>>>>>> Some other poster made the same error recently in this thread; it 
>>>>>> is a
>>>>>> common fallacy in discussions about programming, to assume that since
>>>>>> the same can be expressed using lower level constructs, those are all
>>>>>> that are required.
>>>>>>
>>>>>> If adopted as true it ultimately means the removal of all control
>>>>>> structures above the level of "if" and "goto" (except Python doesn't
>>>>>> have "goto").
>>>>>
>>>>> What I'm trying to explain is that the with: statement has a use even
>>>>> if Cleanup doesn't. Arguing that Cleanup doesn't improve on try:
>>>>> finally: does not mean that the with: statement doesn't improve on
>>>>> try: finally:.
>>>>
>>>> That's a different argument, essentially that you see no advantage for
>>>> your current coding patterns.
>>>>
>>>> It's unconnected to the argument I responded to.
>>>>
>>>> The argument that I responded to, that the possibility of expressing
>>>> things at the level of try:finally: means that a higher level construct
>>>> is superfluous, is still meaningless.
>>>
>>> I am attacking your premise that the "with Cleanup():" construct is
>>> higher level than try: finally:. It isn't. It provides the same level
>>> of abstraction as try: finally:.
>>>
>>> This is distinct from the accepted uses of the with: statement which
>>> *are* higher level than try: finally: and which do confer practical
>>> benefits over using try: finally: despite being syntactical sugar for
>>> try: finally:.
>>>
>>>>>>>>> Both formulations can be correct (and both work perfectly fine 
>>>>>>>>> with
>>>>>>>>> the chdir() example being used). Sometimes one is better than the
>>>>>>>>> other, and sometimes not. You can achieve both ways with either
>>>>>>>>> your
>>>>>>>>> Cleanup class or with try: finally:.
>>>>>>>>>
>>>>>>>>> I am still of the opinion that Cleanup is not an improvement over
>>>>>>>>> try:
>>>>>>>>> finally: and has the significant ugliness of forcing cleanup code
>>>>>>>>> into
>>>>>>>>> callables. This significantly limits what you can do in your
>>>>>>>>> cleanup
>>>>>>>>> code.
>>>>>>>>
>>>>>>>> Uhm, not really. :-) As I see it.
>>>>>>>
>>>>>>> Well, not being able to affect the namespace is a significant
>>>>>>> limitation. Sometimes you need to delete objects from the
>>>>>>> namespace in
>>>>>>> order to ensure that their refcounts go to zero and their cleanup
>>>>>>> code
>>>>>>> gets executed.
>>>>>>
>>>>>> Just a nit (I agree that a lambda can't do this, but as to what's
>>>>>> required): assigning None is sufficient for that[1].
>>>>>
>>>>> Yes, but no callable is going to allow you to assign None to names in
>>>>> that namespace, either. Not without sys._getframe() hackery, in any
>>>>> case.
>>>>>
>>>>>> However, note that the current language doesn't guarantee such
>>>>>> cleanup,
>>>>>> at least as far as I know.
>>>>>>
>>>>>> So while it's good practice to support it, to do everything to let it
>>>>>> happen, it's presumably bad practice to rely on it happening.
>>>>>>
>>>>>>
>>>>>>> Tracebacks will keep the namespace alive and all objects in it.
>>>>>>
>>>>>> Thanks!, I hadn't thought of connecting that to general cleanup
>>>>>> actions.
>>>>>>
>>>>>> It limits the use of general "with" in the same way.
>>>>>
>>>>> Not really.
>>>>
>>>> Sorry, it limits general 'with' in /exactly/ the same way.
>>>>
>>>>> It's easy to write context managers that do that [delete objects from
>>>>> the namespace].
>>>>
>>>> Sorry, no can do, as far as I know; your following example quoted below
>>>> is an example of /something else/.
>>>
>>> Okay, so what do you mean by 'the use of general "with"'? I'm talking
>>> about writing a context manager or using the @contextmanager decorator
>>> to do some initialization and then later cleaning up that
>>> initialization. That cleaning up may entail deleting an object. You
>>> are correct that the context manager can't affect the namespace of the
>>> with: clause, but that's not the initialization that it would need to
>>> clean up.
>>>
>>> Yes, you can write code with a with: statement where you try to clean
>>> up stuff that happened inside of the clause (you did), but that's not
>>> how the with: statement was ever intended to be used nor is it good
>>> practice to do so because of that limitation. Context managers are
>>> designed to initialize specific things, then clean them up. I thought
>>> you were talking about the uses of the with: statement as described in
>>> PEP-343, not every possible misuse of the with: statement.
>>
>> I'm not the one talking about removing variables or that "it's easy to
>> write context managers that do that".
>>
>> You are the one talking about that.
>>
>> So I have really not much to add.
>>
>> It seems that you're now agreeing with me that former is not good
>> practice and that the latter is impossible to do portably, but you now
>> argue against your earlier stand as if that was something that I had put
>> forward.
> 
> No, I'm still saying that sometimes you do need to remove variables that 
> you initialized in the initialization section. Writing a purpose-built 
> context manager which encapsulates the initialization and finalization 
> allows you to do this easily. Putting the initialization section inside 
> the with: clause, as you do, and requiring cleanup code to be put into 
> callables makes this hard.
> 
>> It's a bit confusing when you argue against your own statements.
>>
>>>> And adding on top of irrelevancy, for the pure technical aspect it can
>>>> be accomplished in the same way using Cleanup (I provide an example
>>>> below).
>>>>
>>>> However, doing that would generally be worse than pointless since with
>>>> good coding practices the objects would become unreferenced anyway.
>>>>
>>>>
>>>>> You put the initialization code in the __enter__() method, assign
>>>>> whatever objects you want to keep around through the with: clause as
>>>>> attributes on the manager, then delete those attributes in the
>>>>> __exit__().
>>>>
>>>> Analogously, if one were to do this thing, then it could be 
>>>> accomplished
>>>> using a Cleanup context manager as follows:
>>>>
>>>> foo = lambda: None
>>>> foo.x = create_some_object()
>>>> at_cleanup.call( lambda o = foo: delattr( o, "x" ) )
>>>>
>>>> ... except that
>>>>
>>>> 1) for a once-only case this is less code :-)
>>>
>>> Not compared to a try: finally:, it isn't.
>>
>> Again, this context shifting is bewildering. As you can see, quoted
>> above, you were talking about a situation where you would have defined a
>> context manager, presumably because a 'try' would not in your opinion be
>> simpler for whatever it was that you had in mind. But you are responding
>> to the code I offered as if it was an alternative to something where you
>> would find a 'try' to be simplest.
> 
> I have consistently put forward that for once-only cases, try: finally: 
> is a preferable construct to "with Cleanup():". I also put forward that 
> for repetitive cases, a purpose-built context manager is preferable. I 
> note that for both try: finally: and a purpose-built context manager, 
> modifying the namespace is easy to do while it is difficult and less 
> readable to do with "with Cleanup():". Since you were claiming that the 
> "generic with:" would have the same problem as "with Cleanup():" I was 
> trying to explain for why all of the intended use cases of the with: 
> statement (the purpose-built context managers), there is no problem. 
> Capisce?
> 
>>>> 2) it is a usage that I wouldn't recommend; instead I recommend 
>>>> adopting
>>>> good
>>>> coding practices where object references aren't kept around.
>>>
>>> Many of the use cases of the with: statement involve creating an
>>> object (like a lock or a transaction object), keeping it around for
>>> the duration of the "# Do stuff" block, and then finalizing it.
>>>
>>>>> Or, you use the @contextmanager decorator to turn a generator into a
>>>>> context manager, and you just assign to local variables and del them
>>>>> in the finally: clause.
>>>>
>>>> Uhm, you don't need a 'finally' clause when you define a context
>>>> manager.
>>>
>>> When you use the @contextmanager decorator, you almost always do. See
>>> the Examples section of PEP 343:
>>>
>>> http://www.python.org/dev/peps/pep-0343/
>>>
>>>> Additionally, you don't need to 'del' the local variables in
>>>> @contextmanager decorated generator.
>>>>
>>>> The local variables cease to exist automatically.
>>>
>>> True.
>>>
>>>>> What you can't do is write a generic context manager where the
>>>>> initialization happens inside the with: clause and the cleanup actions
>>>>> are registered callables. That does not allow you to affect the
>>>>> namespace.
>>>>
>>>> If you mean that you can't introduce direct local variables and have
>>>> them deleted by "registered callables" in a portable way, then right.
>>>>
>>>> But I can't think of any example where that would be relevant; in
>>>> particular what matters for supporting on-destruction cleanup is 
>>>> whether
>>>> you keep any references or not, not whether you have a local 
>>>> variable of
>>>> any given name.
>>>
>>> Well, local variables keep references to objects. Variable assignment
>>> followed by deletion is a very readable way to keep an object around
>>> for a while then remove it later. If you have to go through less
>>> readable contortions to keep the object around when it needs to be and
>>> clean it up later, then that is a mark against your approach.
>>
>> Sorry, as with the places noted above, I can't understand what you're
>> trying to say here. I don't recommend coding practices where you keep
>> object references around,
> 
> Then how do you clean up locks and transaction objects and similar 
> things if you don't keep them around during the code suite? Creating an 
> object, keeping it around while executing a specific chunk of code, and 
> finalizing it safely is a prime use case for these kinds of constructs.

Where you need a scope, create a scope.

That is, put the logic in a routine.

However, most objects aren't of the sort the requiring to become unreferenced. 
Those that require cleanup can be cleaned up and left as zombies, like calling 
'close' on a file. And so in the general case what you're discussing, how to get 
rid of object references, is a non-issue  --  irrelevant.


>> and you have twice quoted that above. I don't
>> have any clue what "contortions" you are talking about, it must be
>> something that you imagine.
> 
> These are the contortions:
> 
>   foo = lambda: None
>   foo.x = create_some_object()
>   at_cleanup.call( lambda o = foo: delattr( o, "x" ) )

That's code that demonstrates something very different, in response to your 
description of doing this.

Since I half suspected that it could be taken out of context I followed that 
immediately with

<quote>
   2) it is a usage that I wouldn't recommend; instead I recommend adopting
      good coding practices where object references aren't kept around.
</quote>

I'm sorry but I don't know how to make that more clear.


Cheers & hth.,

- Alf


From alfps at start.no  Fri Mar  5 08:09:08 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Fri, 05 Mar 2010 14:09:08 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.326.1267777257.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>	<hmokot$uso$1@news.eternal-september.org>	<mailman.293.1267718664.23598.python-list@python.org>	<hmop33$rrj$1@news.eternal-september.org>	<mailman.303.1267723835.23598.python-list@python.org>	<6af3c613-3439-484b-83f1-49213f1ed574@k17g2000yqb.googlegroups.com>	<hmpc3r$2il$1@news.eternal-september.org>
	<mailman.326.1267777257.23598.python-list@python.org>
Message-ID: <hmqvpn$j2i$2@news.eternal-september.org>

* Robert Kern:
> On 2010-03-04 16:27 , Alf P. Steinbach wrote:
>> * Mike Kent:
> 
>>> However, I fail to understand his response that I must have meant try/
>>> else instead, as this, as Mr. Kern pointed out, is invalid syntax.
>>> Perhaps Mr. Steinbach would like to give an example?
>>
>> OK.
>>
>> Assuming that you wanted the chdir to be within a try block (which it
>> was in your code), then to get code equivalent to my code, for the
>> purpose of a comparision of codes that do the same, you'd have to write
>> something like ...
>>
>> original_dir = os.getcwd()
>> try:
>> os.chdir(somewhere)
>> except Whatever:
>> # E.g. log it.
>> raise
>> else:
>> try:
>> # Do other stuff
>> finally:
>> os.chdir(original_dir)
>> # Do other cleanup
>>
>> ... which would be a more general case.
>>
>> I've also given this example in response to Robert earlier in the
>> thread. Although I haven't tried it I believe it's syntactically valid.
>> If not, then the relevant typo should just be fixed. :-)
>>
>> I have no idea which construct Robert thought was syntactically invalid.
>> I think that if he's written that, then it must have been something he
>> thought of.
> 
> I was just trying to interpret what you meant by "Changing 'finally' to 
> 'else' could make it equivalent."

Oh yes, in the article where I gave the example of that, shown above.

Hey, discussing previous discussion is silly.


Cheers,

- ALf


From mrkafk at gmail.com  Fri Mar  5 08:26:13 2010
From: mrkafk at gmail.com (mk)
Date: Fri, 05 Mar 2010 14:26:13 +0100
Subject: loop over list and process into groups
In-Reply-To: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>
References: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>
Message-ID: <4B910675.60909@gmail.com>

Sneaky Wombat wrote:
> [ 'VLAN4065',
>  'Interface',
>  'Gi9/6',
>  'Po2',
>  'Po3',
>  'Po306',
>  'VLAN4068',
>  'Interface',
>  'Gi9/6',
>  'VLAN4069',
>  'Interface',
>  'Gi9/6',]

Hey, I just invented a cute ;-) two-liner using list comprehensions:

# alist = list above

tmp, dk = [], {}
[(x.startswith('VLAN') and (dk.setdefault(x,[]) or tmp.append(x))) or 
(not x.startswith('VLAN') and dk[tmp[-1]].append(x))    for x in alist 
if x != 'Interface']

No need to use a nuke like itertools to kill a fly. ;-)

Regards,
mk



From raghavendra.gv.vanam at gmail.com  Fri Mar  5 08:32:21 2010
From: raghavendra.gv.vanam at gmail.com (vanam)
Date: Fri, 5 Mar 2010 05:32:21 -0800 (PST)
Subject: process mp3 file
References: <6fc7b483-c9a9-4581-991c-f816a2701526@g8g2000pri.googlegroups.com>
	<mailman.173.1267611946.23598.python-list@python.org>
	<9ab3890c-14b9-4031-96c1-6f991469c9ae@m35g2000prh.googlegroups.com>
Message-ID: <e6ebc773-e837-4b61-ab51-cb7432aaca0e@b7g2000pro.googlegroups.com>

On Mar 3, 3:43?pm, asit <lipu... at gmail.com> wrote:
> > Define "processing".
>
> getting the title, song name, etc of the file and updating in a
> database

Other possibility can be passing out the extension of the file and
directory where
the files are present, using os.walk we can extract the file name by
filtering the .mp3 extension.


From duncan.booth at invalid.invalid  Fri Mar  5 08:38:51 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 5 Mar 2010 13:38:51 GMT
Subject: Evaluate my first python script, please
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
	<mailman.338.1267785907.23598.python-list@python.org>
Message-ID: <Xns9D328A6F02AB0duncanbooth@127.0.0.1>

Jean-Michel Pichavant <jeanmichel at sequans.com> wrote:

> You've already been given good advices.
> Unlike some of those, I don't think using regexp an issue in any way. 
> Yes they are not readable, for sure, I 100% agree to that statement, but 
> you can make them readable very easily.
> 
> # not readable
> match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line)
> 
> 
> # readable
> match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line) # match 
> '192.168.200.1   (foo123)'
> 
> I gladly understand ppl that are not willing to use regexp (or as last 
> resort), but for a perl guy, that should not be an issue.

The problem with your comment is that just by existing it means people will 
be misled into thinking the regex is being used to match strings like
  '192.168.200.1   (foo123)'
when in fact the OP is expecting to match strings like
  '192.168.200.1   foo123'

i.e. you may mislead some people into thinking the parentheses are part of 
what is being matched when they're actually grouping within the regex.

Another problem with either regular expression line is that it makes it 
less easy to see that it doesn't do what the OP wanted. /etc/hosts contains  
lines with an IP address followed by multiple hostnames. It may also 
contain comments either as complete lines or at the end of lines. The code 
given will miss hostnames after the first and will include hostnames in 
commented out lines.

-- 
Duncan Booth http://kupuguy.blogspot.com


From mehgcap at gmail.com  Fri Mar  5 08:41:37 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Fri, 5 Mar 2010 08:41:37 -0500
Subject: python on a thumb drive?
Message-ID: <bc7f680c1003050541i18e96389pb8474ae272a2d930@mail.gmail.com>

Hello all,
My name is Alex. I am pretty new to Python, but I really like it.

I am trying to put my python and pythonw executables on my thumb
drive, along with packages, using Moveable Python, but I cannot figure
out how to run scripts using it. I would rather use a shell than the
script runner gui since it does not seem to work. Any suggestions?
Thanks!

-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From jeanmichel at sequans.com  Fri Mar  5 09:28:49 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 05 Mar 2010 15:28:49 +0100
Subject: Evaluate my first python script, please
In-Reply-To: <Xns9D328A6F02AB0duncanbooth@127.0.0.1>
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>	<mailman.338.1267785907.23598.python-list@python.org>
	<Xns9D328A6F02AB0duncanbooth@127.0.0.1>
Message-ID: <4B911521.20302@sequans.com>

Duncan Booth wrote:
> Jean-Michel Pichavant <jeanmichel at sequans.com> wrote:
>
>   
>> You've already been given good advices.
>> Unlike some of those, I don't think using regexp an issue in any way. 
>> Yes they are not readable, for sure, I 100% agree to that statement, but 
>> you can make them readable very easily.
>>
>> # not readable
>> match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line)
>>
>>
>> # readable
>> match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line) # match 
>> '192.168.200.1   (foo123)'
>>
>> I gladly understand ppl that are not willing to use regexp (or as last 
>> resort), but for a perl guy, that should not be an issue.
>>     
>
> The problem with your comment is that just by existing it means people will 
> be misled into thinking the regex is being used to match strings like
>   '192.168.200.1   (foo123)'
> when in fact the OP is expecting to match strings like
>   '192.168.200.1   foo123'
>
> i.e. you may mislead some people into thinking the parentheses are part of 
> what is being matched when they're actually grouping within the regex.
>
> Another problem with either regular expression line is that it makes it 
> less easy to see that it doesn't do what the OP wanted. /etc/hosts contains  
> lines with an IP address followed by multiple hostnames. It may also 
> contain comments either as complete lines or at the end of lines. The code 
> given will miss hostnames after the first and will include hostnames in 
> commented out lines.
>
>   
And tell me how not using regexp will ensure the /etc/hosts processing 
is correct ? The non regexp solutions provided in this thread did not 
handled what you rightfully pointed out about host list and commented lines.

And FYI, the OP pattern does match '192.168.200.1 (foo123)'
...
Ok that's totally unfair :D You're right I made a mistake.  Still the 
comment is absolutely required (provided it's correct).

JM


From jpiitula at ling.helsinki.fi  Fri Mar  5 09:43:47 2010
From: jpiitula at ling.helsinki.fi (Jussi Piitulainen)
Date: 05 Mar 2010 16:43:47 +0200
Subject: Partly erratic wrong behaviour, Python 3, lxml
References: <qotr5o0xt3l.fsf@ruuvi.it.helsinki.fi>
	<mailman.308.1267729874.23598.python-list@python.org>
	<qotlje7ydd4.fsf@ruuvi.it.helsinki.fi>
	<mailman.333.1267778901.23598.python-list@python.org>
Message-ID: <qotbpf27rrw.fsf@ruuvi.it.helsinki.fi>

Stefan Behnel writes:
> Jussi Piitulainen, 04.03.2010 22:40:
> > Stefan Behnel writes:
> >> Jussi Piitulainen, 04.03.2010 11:46:
> >>> I am observing weird semi-erratic behaviour that involves Python 3
> >>> and lxml, is extremely sensitive to changes in the input data, and
> >>> only occurs when I name a partial result. I would like some help
> >>> with this, please. (Python 3.1.1; GNU/Linux; how do I find lxml
> >>> version?)
> >>
> >> Here's how to find the version:
> >>
> >> http://codespeak.net/lxml/FAQ.html#i-think-i-have-found-a-bug-in-lxml-what-should-i-do
> >
> > Ok, thank you. Here's the results:
> >
> > >>> print(et.LXML_VERSION, et.LIBXML_VERSION,
> > ...       et.LIBXML_COMPILED_VERSION, et.LIBXSLT_VERSION,
> > ...       et.LIBXSLT_COMPILED_VERSION)
> > (2, 2, 4, 0) (2, 6, 26) (2, 6, 26) (1, 1, 17) (1, 1, 17)
> 
> I can't reproduce this with the latest lxml trunk (and Py3.2 trunk)
> and libxml2 2.7.6, even after running your test script for quite a
> while. I'd try to upgrade the libxml2 version.

Thank you much. I suppose that is good news. It's a big server with
many users - I will ask the administrators to consider an upgrade when
I get around to it.

Turns out that lxml documentation warns not to use libxml2 version
2.6.27 if I want to use xpath, and that is just a bit newer than we
have. On that cue, I seem to have found a workaround: I replaced the
xpath expression with findall(titlef) where

    titlef = ( '//{http://www.openarchives.org/OAI/2.0/}record'
               '//{http://purl.org/dc/elements/1.1}title' )

In the previously broken naming() function I now have:

        result = etree.parse(BytesIO(body))
        n = len(result.findall(titlef))

And in the previously working nesting() function:

        n = len(etree.parse(BytesIO(body)).findall(titlef))

With these changes, the test script gives consistently the result that
I expect, and the more complicated real test script where I first met
the problem also appears to work without a hitch. So, this works.

The other, broken behaviour is totally scary, though.


From duncan.booth at invalid.invalid  Fri Mar  5 10:00:07 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 5 Mar 2010 15:00:07 GMT
Subject: Evaluate my first python script, please
References: <Xns9D328A6F02AB0duncanbooth@127.0.0.1>
	<mailman.350.1267799340.23598.python-list@python.org>
Message-ID: <Xns9D32973F91EA1duncanbooth@127.0.0.1>

Jean-Michel Pichavant <jeanmichel at sequans.com> wrote:

> And tell me how not using regexp will ensure the /etc/hosts processing
> is correct ? The non regexp solutions provided in this thread did not 
> handled what you rightfully pointed out about host list and commented
> lines. 

It won't make is automatically correct, but I'd guess that written without 
being so dependent on regexes might have made someone point out those 
deficiencies sooner. The point being that casual readers of the code won't 
take the time to decode the regex, they'll glance over it and assume it 
does something or other sensible.

If I was writing that code, I'd read each line, strip off comments and 
leading whitespace (so you can use re.match instead of re.search), split on 
whitespace and take all but the first field. I might check that the field 
I'm ignoring it something like a numeric ip address, but if I did want to 
do then I'd include range checking for valid octets so still no regex.

The whole of that I'd wrap in a generator so what you get back is a 
sequence of host names.

However that's just me. I'm not averse to regular expressions, I've written 
some real mammoths from time to time, but I do avoid them when there are 
simpler clearer alternatives.

> And FYI, the OP pattern does match '192.168.200.1 (foo123)'
> ...
> Ok that's totally unfair :D You're right I made a mistake.  Still the 
> comment is absolutely required (provided it's correct).
> 
Yes, the comment would have been good had it been correct. I'd also go for 
a named group as that provides additional context within the regex.

Also if there are several similar regular expressions in the code, or if 
they get too complex I'd build them up in parts. e.g.

OCTET = r'(?:\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])'
ADDRESS = (OCTET + r'\.') * 3 + OCTET
HOSTNAME = r'[-a-zA-Z0-9]+(?:\.[-a-zA-Z0-9]+)*'
  # could use \S+ but my Linux manual says
  # alphanumeric, dash and dots only
... and so on ...

which provides another way of documenting the intentions of the regex.

BTW, I'm not advocating that here, the above patterns would be overkill, 
but in more complex situations thats what I'd do.

-- 
Duncan Booth http://kupuguy.blogspot.com


From jjposner at optimum.net  Fri Mar  5 10:10:51 2010
From: jjposner at optimum.net (John Posner)
Date: Fri, 05 Mar 2010 10:10:51 -0500
Subject: Method / Functions - What are the differences?
In-Reply-To: <4b90f5eb$0$9148$426a74cc@news.free.fr>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
	<mailman.109.1267539415.23598.python-list@python.org>
	<hmk1mn$70u$1@newsreader3.netcologne.de>
	<4b8e4041$0$17447$426a34cc@news.free.fr>
	<hmlte9$d0f$1@dough.gmane.org>
	<mailman.205.1267633968.23598.python-list@python.org>
	<4b8e9660$0$21812$426a34cc@news.free.fr>
	<hmmrh4$644$1@newsreader3.netcologne.de>
	<4B8EF717.3070701@optimum.net> <4b902338$0$31260$607ed4bc@cv.net>
	<4b90f5eb$0$9148$426a74cc@news.free.fr>
Message-ID: <4b911ee0$0$4988$607ed4bc@cv.net>

On 3/5/2010 7:15 AM, Bruno Desthuilliers wrote:
> John Posner a ?crit :
>> On 3/3/2010 6:56 PM, John Posner wrote:
>>>
>>> ... I was thinking
>>> today about "doing a Bruno", and producing similar pieces on:
>>>
>>> * properties created with the @property decorator
>>>
>>> * the descriptor protocol
>>>
>>> I'll try to produce something over the next couple of days.
>>>
>>
>> Starting to think about a writeup on Python properties, I've
>> discovered that the official Glossary [1] lacks an entry for
>> "property" -- it's missing in both Py2 and Py3!
>>
>> Here's a somewhat long-winded definition -- comments, please:
>>
>> ---------------------------------------------
>> An attribute, *a*, of an object, *obj*, is said to be implemented as a
>> property if the standard ways of accessing the attribute:
>>
>> * evaluation: print obj.a
>> * assignment: obj.a = 42
>> * deletion: del obj.a
>>
>> ... cause methods of a user-defined *property object* to be invoked.
>
> Hmmm... a couple remarks:
>
> 1/ "property" is actually the name of a Python builtin type. It's also
> pretty much used in general OO litterature for what we name
> "attributes". So I think it would be better to avoid confusion between
> "property" as the builtin type, "property" as synonym for attribute, and
> "property" as the more specific concept of "computed attribute" - which
> is what you're describing here.
>
> As far as I'm concerned, I prefer to stick to "computed attribute" for
> the generic case, and only use "property" when the computed attribute is
> actually implemented using the builtin property type.

Yes, I had already decided that the first sentence of the glossary 
definition needs to be, "A property is a computed attribute".

>
> 2/ depending on how the computed attribute is implemented, the
> computation needs not happen on ALL get/set/del access - you can have
> non-binding descriptors (that is, not implementing __set__).

Yes, but IMHO that information belongs in the full writeup, not in the 
glossary definition. I've added the phrase "some or all" in the glossary 
definition (see below).

> Also, the "standard" access also include getattr(), setattr() and
> delattr() (might be worth a note).
>
>> The attribute
>
> /attribute/user-defined object/ here ?
>
>> is created as a class attribute, not an instance attribute. Example:
>>
>> class Widget:
>> # create "color" as class attribute, not within __init__()
>> color = <<property-object>>
>>
>> def __init__(self, ...):
>> # do not define "self.color" instance attribute
>
> Yes you can, and it's even actually pretty common:

Of course -- and I realize that I was introducing confusion, rather than 
enlightenment, with my example. I think the point is too subtle for a 
(necessarily short) glossary definition, so I'm removing the example 
from the definition.

>
> # example.py
> from somewhere import RGBColor
>
> class Foo(object):
> def _get_color(self):
> return str(self._color)
> def _set_color(self, val):
> self._color = RGBColor.from_string(val)
> color = property(fget=_get_color, fset=_set_color)
>
> def __init__(self, colorvalue):
> self.color = colorvalue

[OFF-TOPIC] Wow, Thunderbird 3.0.2 nuked the indentation in the code 
above. :-(

>
>
>> The property object can be created with the built-in function property(),
>
> It's actually a type, not a function.

Ah, yes. Thanks.

>
>> which in some cases can be coded as a decorator: @property. The
>> property object can also be an instance of a class that implements the
>> descriptor protocol.
>
> The "property object" IS an instance of a class that implements the
> descriptor protocol. The property type is just a "generic" descriptor:
>
> # naive (and incomplete) python implementation of the property type
>
> class property(object):
> def __init__(self, fget, fset=None, fdel=None)
> self._fget = fget
> self._fset = fset
> self._fdel = fdel
>
> def __get__(self, instance, cls):
> if instance is None:
> return self
> return self._fget(instance)
>
> def __set__(self, instance, value):
> if not self._fset:
> raise AttributeError("can't set attribute")
> self._fset(instance, value)
>
> def __del__(self):
> if not self._fdel:
> raise AttributeError("can't delete attribute")
> self._fdel(instance)

Good stuff for the full writeup on properties.


> As far as I'm concerned, I'd "plan" such a paper as:
>
> """
> What's a property ? It's a computed attribute implemented using the
> builtin "property" type.
>
> Ok, so far it doesn't help much. So
> 1/ what's a computed attribute, and
> 2/ what is the property type ?
>
> 1/ your above explanation about what's a computed attribute in general,
> then a brief explanation of how computed attributes are implemented in
> python -> IOW, the descriptor protocol
>
> 2/ my above snippet !-)

I agree. I'm not sure whether the "brief explanation of how computed 
attributes are implemented in Python" belongs in the *properties* 
writeup or the *descriptors* writeup. (I think they should be separate, 
to avoid making readers brains explode.) I'll make the (initial) call 
when/if I get that far!


>
> """
>
> I think the way you started explaining computed attributes wrt/
> attribute access could be a pretty good way to explain the descriptor
> protocol, since the mapping from get/set/del access to __get__, __set__,
> and __del__ magic methods is then pretty obvious.
>
> But YMMV of course, so by all mean feel free to discard all or parts of
> the above remarks !-)
>
> HTH


Here's my leaner, meaner glossary definition of *property*:

-------------------
A property is a computed attribute: an attribute, a, of an object, obj, 
is said to be implemented as a property if some or all of the standard 
ways of accessing the attribute:

  * evaluation:    result = obj.a
  * assignment:    obj.a = 42
  * deletion:      del obj.a

... cause methods of another user-defined object to be invoked. This 
other object can be an instance of the built-in type *property*, or as 
an instance of a class that implements the descriptor protocol.
-------------------

Many thanks, Bruno -- again!

-John


From J.Fine at open.ac.uk  Fri Mar  5 10:19:45 2010
From: J.Fine at open.ac.uk (Jonathan Fine)
Date: Fri, 05 Mar 2010 15:19:45 +0000
Subject: WANTED: A good name for the pair (args, kwargs)
In-Reply-To: <hmo94l$9hb$1@south.jnrs.ja.net>
References: <hmo94l$9hb$1@south.jnrs.ja.net>
Message-ID: <hmr7eh$3ar$1@south.jnrs.ja.net>

Jonathan Fine wrote:
> Hi
> 
> We can call a function fn using
>     val = fn(*args, **kwargs)
> 
> I'm looking for a good name for the pair (args, kwargs).  Any suggestions?
> 
> Here's my use case:
>     def doit(fn , wibble, expect):
>         args, kwargs = wibble
>         actual = fn(*args, **kwargs)
>         if actual != expect:
>             # Something has gone wrong.
>             pass
> 
> This is part of a test runner.
> 
> For now I'll use argpair, but if anyone has a better idea, I'll use it.

Thank you, Tim, Paul, Steve and Aahz for your suggestions.

I'm now preferring:

     def test_apply(object, argv, valv):
	
         args, kwargs = argv
         expect, exceptions = valv

         # Inside try: except:
         actual = object(*args, **kwargs)

         # Check against expect, exceptions.

best regards


Jonathan





From pemerson at gmail.com  Fri Mar  5 10:53:06 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 07:53:06 -0800 (PST)
Subject: Evaluate my first python script, please
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
	<mailman.335.1267780414.23598.python-list@python.org>
Message-ID: <75a58067-9554-496b-ba38-1a3a8023d866@w27g2000pre.googlegroups.com>

Thanks for your response, further questions inline.

On Mar 4, 11:07?am, Tim Wintle <tim.win... at teamrubber.com> wrote:
> On Thu, 2010-03-04 at 10:39 -0800, Pete Emerson wrote:
> > I am looking for advice along the lines of "an easier way to do this"
> > or "a more python way" (I'm sure that's asking for trouble!) or
> > "people commonly do this instead" or "here's a slick trick" or "oh,
> > interesting, here's my version to do the same thing".
>
> (1) I would wrap it all in a function
>
> def main():
> ? ? # your code here
>
> if __name__ == "__main__":
> ? ? main()

Is this purely aesthetic reasons, or will I appreciate this when I
write my own modules, or something else?

>
> (2) PEP8 (python style guidelines) suggests one import per line
>
> (3) I'd use four spaces as tab width
>
> (4)
> I'd change this:
>
> > ? ? for arg in sys.argv[1:]:
> > ? ? ? ? for section in hostname.split('.'):
> > ? ? ? ? ? ? if section == arg:
> > ? ? ? ? ? ? ? ? count = count + 1
> > ? ? ? ? ? ? ? ? break
>
> to something more like:
>
> ? ? for section in hostname.split("."):
> ? ? ? ? if section in sys.argv[1:]:
> ? ? ? ? ? ? count += 1

Ah, yes, I like that. It moves towards the set notation I've wound up
with. Definitely more readable to me.

>
> (although as you suggested I'd only calculate sys.argv[1:] once)
>
> ... or you could replace whole section between the for loop and
> hosts.append with:
>
> ? ? if sorted(hostname.split(".")) == sorted(sys.argv[1:]):
> ? ? ? ? host.append(hostname)

This doesn't actually work, because I'm not looking for a one to one
mapping of args to sections of hostname, but rather a subset. So
passing in 'prod sfo' would register a match for '001.webapp.prod.sfo'.


From pemerson at gmail.com  Fri Mar  5 10:55:00 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 07:55:00 -0800 (PST)
Subject: Evaluate my first python script, please
References: <Xns9D328A6F02AB0duncanbooth@127.0.0.1>
	<mailman.350.1267799340.23598.python-list@python.org> 
	<Xns9D32973F91EA1duncanbooth@127.0.0.1>
Message-ID: <6c76b898-9137-49d7-94a0-efd63fc82aed@c37g2000prb.googlegroups.com>

On Mar 5, 7:00?am, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> Jean-Michel Pichavant <jeanmic... at sequans.com> wrote:
> > And tell me how not using regexp will ensure the /etc/hosts processing
> > is correct ? The non regexp solutions provided in this thread did not
> > handled what you rightfully pointed out about host list and commented
> > lines.
>
> It won't make is automatically correct, but I'd guess that written without
> being so dependent on regexes might have made someone point out those
> deficiencies sooner. The point being that casual readers of the code won't
> take the time to decode the regex, they'll glance over it and assume it
> does something or other sensible.
>
> If I was writing that code, I'd read each line, strip off comments and
> leading whitespace (so you can use re.match instead of re.search), split on
> whitespace and take all but the first field. I might check that the field
> I'm ignoring it something like a numeric ip address, but if I did want to
> do then I'd include range checking for valid octets so still no regex.
>
> The whole of that I'd wrap in a generator so what you get back is a
> sequence of host names.
>
> However that's just me. I'm not averse to regular expressions, I've written
> some real mammoths from time to time, but I do avoid them when there are
> simpler clearer alternatives.
>
> > And FYI, the OP pattern does match '192.168.200.1 (foo123)'
> > ...
> > Ok that's totally unfair :D You're right I made a mistake. ?Still the
> > comment is absolutely required (provided it's correct).
>
> Yes, the comment would have been good had it been correct. I'd also go for
> a named group as that provides additional context within the regex.
>
> Also if there are several similar regular expressions in the code, or if
> they get too complex I'd build them up in parts. e.g.
>
> OCTET = r'(?:\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])'
> ADDRESS = (OCTET + r'\.') * 3 + OCTET
> HOSTNAME = r'[-a-zA-Z0-9]+(?:\.[-a-zA-Z0-9]+)*'
> ? # could use \S+ but my Linux manual says
> ? # alphanumeric, dash and dots only
> ... and so on ...
>
> which provides another way of documenting the intentions of the regex.
>
> BTW, I'm not advocating that here, the above patterns would be overkill,
> but in more complex situations thats what I'd do.
>
> --
> Duncan Boothhttp://kupuguy.blogspot.com

All good comments here. The takeaway for my lazy style of regexes
(which makes it harder for non-regex fiends to read, regardless of the
language) is that there are ways to make regexes much more readable to
the untrained eye. Duncan, I like your method of defining sections of
the regex outside the regex itself, even if it's a one time use.


From john at castleamber.com  Fri Mar  5 10:55:11 2010
From: john at castleamber.com (John Bokma)
Date: Fri, 05 Mar 2010 09:55:11 -0600
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org>
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
	<mailman.199.1267631220.23598.python-list@python.org>
	<7xlje8lb9o.fsf@ruckus.brouhaha.com> <7vbiuqF4utU1@mid.individual.net>
	<4b90bb3c$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <87sk8ercf4.fsf@castleamber.com>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:

> On Fri, 05 Mar 2010 18:36:06 +1300, Gregory Ewing wrote:
>
>> Paul Rubin wrote:
>>> ReST was another solution in search of a problem.
>> 
>> I think the basic idea behind ReST is quite good, i.e. understanding as
>> markup various typographical conventions that make sense in plain text,
>> such as underlined headings, bullets, numbered paragraphs.
>> 
>> Unfortunately it went overboard with a slew of cryptic codes for
>> footnotes, hyperlinks, etc. that nobody would naturally think to use in
>> a plain text document.
>
> I use footnotes all the time[1] in plain text documents and emails. I 
> don't think there's anything bizarre about it at all.


http://docutils.sourceforge.net/docs/user/rst/quickref.html#footnotes [#]_.

.. [#] the keyword is ReST.

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From showell30 at yahoo.com  Fri Mar  5 11:01:12 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Fri, 5 Mar 2010 08:01:12 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org> 
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com> 
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
	<mailman.199.1267631220.23598.python-list@python.org> 
	<7xlje8lb9o.fsf@ruckus.brouhaha.com>
	<e6f5c938-dfac-4c0c-8b4b-cbda2a670dcf@x1g2000prb.googlegroups.com>
	<7xvddbqkgp.fsf@ruckus.brouhaha.com>
Message-ID: <a996c58b-5dcb-49cd-9db8-242fe26e4e11@o16g2000prh.googlegroups.com>

On Mar 4, 11:46?pm, Paul Rubin <no.em... at nospam.invalid> wrote:
>
> Ehh, either the JSON standardizers care about this issue or else they
> don't. ?JSON (as currently defined) is a machine-to-machine
> serialization format and just isn't that good a choice for handwritten
> files. ?Adding a comment specification is a small perturbation that
> might be accepted into the standard, but a big departure like RSON is a
> whole nother creature.
>
> > How many hundreds of thousands of people have had to deal with XML
> > without receiving its benefits? ?Do well-established standards get an
> > exemption from the rule that software is not allowed to annoy non-
> > willing users of it?
>
> We already have to deal with XML. ?So using XML for config files doesn't
> require anyone to deal with any lousy formats that they didn't have to
> deal with before. ?So the basic answer to your question about
> well-established standards is yes: one annoying but standardized format
> is better than multiple annoying unstandardized ones.

<question type="rhetorical">
Does this mean we should stick with XML until the end of time?
</question>



From tim.wintle at teamrubber.com  Fri Mar  5 11:07:22 2010
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Fri, 05 Mar 2010 16:07:22 +0000
Subject: Evaluate my first python script, please
In-Reply-To: <75a58067-9554-496b-ba38-1a3a8023d866@w27g2000pre.googlegroups.com>
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
	<mailman.335.1267780414.23598.python-list@python.org>
	<75a58067-9554-496b-ba38-1a3a8023d866@w27g2000pre.googlegroups.com>
Message-ID: <1267805242.29768.7.camel@localhost>

On Fri, 2010-03-05 at 07:53 -0800, Pete Emerson wrote:
> Thanks for your response, further questions inline.
> 
> On Mar 4, 11:07 am, Tim Wintle <tim.win... at teamrubber.com> wrote:
> > On Thu, 2010-03-04 at 10:39 -0800, Pete Emerson wrote:
> > > I am looking for advice along the lines of "an easier way to do this"
> > > or "a more python way" (I'm sure that's asking for trouble!) or
> > > "people commonly do this instead" or "here's a slick trick" or "oh,
> > > interesting, here's my version to do the same thing".
> >
> > (1) I would wrap it all in a function
> >
> > def main():
> >     # your code here
> >
> > if __name__ == "__main__":
> >     main()
> 
> Is this purely aesthetic reasons, or will I appreciate this when I
> write my own modules, or something else?

It's for when you reuse this code. 

Consider it's in "mymodule.py" (so run with ./mymodule.py) - if you then
make a "tests.py" (for example) you can "import mymodule" without it
automatically running your code.

re-writing it

def main(args):
    #your code

if __name__ == "__main__":
    main(sys.argv[1:])

would obviously be more sensible for actually writing tests.


> > ... or you could replace whole section between the for loop and
> > hosts.append with:
> >
> >     if sorted(hostname.split(".")) == sorted(sys.argv[1:]):
> >         host.append(hostname)
> 
> This doesn't actually work, because I'm not looking for a one to one
> mapping of args to sections of hostname, but rather a subset. So
> passing in 'prod sfo' would register a match for '001.webapp.prod.sfo'.

Ah - good point - I guess the the set intersection technique someone
else mentioned is best in that case.

Tim



From chris.lieb at gmail.com  Fri Mar  5 11:08:56 2010
From: chris.lieb at gmail.com (Chris Lieb)
Date: Fri, 5 Mar 2010 08:08:56 -0800 (PST)
Subject: Failure in test_hashlib.py and test_hmac.py
References: <175865db-f64a-4633-8e36-ab4a5a5eaccf@x22g2000yqx.googlegroups.com>
	<7xr5nzqkaw.fsf@ruckus.brouhaha.com>
Message-ID: <a8172d6e-4507-4201-a94f-20a47892bd79@g11g2000yqe.googlegroups.com>

On Mar 5, 2:50?am, Paul Rubin <no.em... at nospam.invalid> wrote:
> Chris Lieb <chris.l... at gmail.com> writes:
> > I am building Python 2.6.4 on a shared server and am encountering test
> > failures in test_hashlib.py and test_hmac.py,
>
> You should certainly file a bug report (bugs.python.org). ?If you want
> to debug it yourself and include a patch, that's great. ?Otherwise, just
> file the report.
>
> ? ? In the case of test_hashlib.py, it segfaulted on the first sha512 test
> ? ? when I didn't have the debugging options enabled. ?Only after enabling
> ? ? debugging did I get FAIL's for the sha512 tests.
>
> ? ? Does anyone know what is causing these failures?
>
> Please be precise about the hw and compiler versions.

I have created this as bug 8073 [http://bugs.python.org/issue8073]


From python.list at tim.thechases.com  Fri Mar  5 11:28:41 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Fri, 05 Mar 2010 10:28:41 -0600
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <a996c58b-5dcb-49cd-9db8-242fe26e4e11@o16g2000prh.googlegroups.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<mailman.64.1267463648.23598.python-list@python.org>	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>	<7xljebyl56.fsf@ruckus.brouhaha.com>	<mailman.70.1267468806.23598.python-list@python.org>
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>	<7x635fdcth.fsf@ruckus.brouhaha.com>	<mailman.199.1267631220.23598.python-list@python.org>
	<7xlje8lb9o.fsf@ruckus.brouhaha.com>	<e6f5c938-dfac-4c0c-8b4b-cbda2a670dcf@x1g2000prb.googlegroups.com>	<7xvddbqkgp.fsf@ruckus.brouhaha.com>
	<a996c58b-5dcb-49cd-9db8-242fe26e4e11@o16g2000prh.googlegroups.com>
Message-ID: <4B913139.7000704@tim.thechases.com>

Steve Howell wrote:
> On Mar 4, 11:46 pm, Paul Rubin <no.em... at nospam.invalid> wrote:
>> We already have to deal with XML.  So using XML for config files doesn't
>> require anyone to deal with any lousy formats that they didn't have to
>> deal with before.  So the basic answer to your question about
>> well-established standards is yes: one annoying but standardized format
>> is better than multiple annoying unstandardized ones.
> 
> <question type="rhetorical">
> Does this mean we should stick with XML until the end of time?
> </question>

One word:  COBOL

:-)

-tkc




From mrmakent at gmail.com  Fri Mar  5 11:29:59 2010
From: mrmakent at gmail.com (Mike Kent)
Date: Fri, 5 Mar 2010 08:29:59 -0800 (PST)
Subject: A "scopeguard" for Python
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<mailman.209.1267635630.23598.python-list@python.org>
	<cf51c311-7354-4e89-ab2e-45bb8b66d67d@z35g2000yqd.googlegroups.com>
	<mailman.320.1267754017.23598.python-list@python.org>
Message-ID: <c1ecd9a2-9cdf-408d-9743-7e1dfa05bf47@q23g2000yqd.googlegroups.com>

On Mar 4, 8:04?pm, Robert Kern <robert.k... at gmail.com> wrote:

> No, the try: finally: is not implicit. See the source for
> contextlib.GeneratorContextManager. When __exit__() gets an exception from the
> with: block, it will push it into the generator using its .throw() method. This
> raises the exception inside the generator at the yield statement.

Wow, I just learned something new.  My understanding of context
managers was that the __exit__ method was guaranteed to be executed
regardless of how the context was left.  I have often written my own
context manager classes, giving them the __enter__ and __exit__
methods.  I had mistakenly assumed that the @contextmanager decorator
turned a generator function into a context manager with the same
behavior as the equivalent context manager class.  Now I learn that,
no, in order to have the 'undo' code executed in the presence of an
exception, you must write your own try/finally block in the generator
function.

This raises the question in my mind: What's the use case for using
@contextmanager rather than wrapping your code in a context manager
class that defines __enter__ and __exit__, if you still have to
manager your own try/finally block?


From showell30 at yahoo.com  Fri Mar  5 11:38:27 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Fri, 5 Mar 2010 08:38:27 -0800 (PST)
Subject: A "scopeguard" for Python
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<mailman.209.1267635630.23598.python-list@python.org>
	<cf51c311-7354-4e89-ab2e-45bb8b66d67d@z35g2000yqd.googlegroups.com>
	<mailman.320.1267754017.23598.python-list@python.org>
	<c1ecd9a2-9cdf-408d-9743-7e1dfa05bf47@q23g2000yqd.googlegroups.com>
Message-ID: <38c910f9-0ab5-44cf-8cdc-128d5720324c@f17g2000prh.googlegroups.com>

On Mar 5, 8:29?am, Mike Kent <mrmak... at gmail.com> wrote:
> On Mar 4, 8:04?pm, Robert Kern <robert.k... at gmail.com> wrote:
>
> > No, the try: finally: is not implicit. See the source for
> > contextlib.GeneratorContextManager. When __exit__() gets an exception from the
> > with: block, it will push it into the generator using its .throw() method. This
> > raises the exception inside the generator at the yield statement.
>
> Wow, I just learned something new. ?My understanding of context
> managers was that the __exit__ method was guaranteed to be executed
> regardless of how the context was left. ?I have often written my own
> context manager classes, giving them the __enter__ and __exit__
> methods. ?I had mistakenly assumed that the @contextmanager decorator
> turned a generator function into a context manager with the same
> behavior as the equivalent context manager class. ?Now I learn that,
> no, in order to have the 'undo' code executed in the presence of an
> exception, you must write your own try/finally block in the generator
> function.
>
> This raises the question in my mind: What's the use case for using
> @contextmanager rather than wrapping your code in a context manager
> class that defines __enter__ and __exit__, if you still have to
> manager your own try/finally block?

Unless I am misunderstanding the question, the use case is that you
still only have to write the context manager once, and you might get
multiple uses out of it where the with-enclosed code blocks work at a
higher level of abstraction.

I actually don't use @contextmanager yet, mainly because I did not
know it existed until recently, but also because I find the __enter__/
__exit__ paradigm straightforward enough to just hand code them that
way.



From pruebauno at latinmail.com  Fri Mar  5 11:41:24 2010
From: pruebauno at latinmail.com (nn)
Date: Fri, 5 Mar 2010 08:41:24 -0800 (PST)
Subject: loop over list and process into groups
References: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>
	<mailman.344.1267795628.23598.python-list@python.org>
Message-ID: <7a1d6fe9-d2c8-4c7e-8173-1e6b4d010f6a@g26g2000yqn.googlegroups.com>



mk wrote:
> Sneaky Wombat wrote:
> > [ 'VLAN4065',
> >  'Interface',
> >  'Gi9/6',
> >  'Po2',
> >  'Po3',
> >  'Po306',
> >  'VLAN4068',
> >  'Interface',
> >  'Gi9/6',
> >  'VLAN4069',
> >  'Interface',
> >  'Gi9/6',]
>
> Hey, I just invented a cute ;-) two-liner using list comprehensions:
>
> # alist = list above
>
> tmp, dk = [], {}
> [(x.startswith('VLAN') and (dk.setdefault(x,[]) or tmp.append(x))) or
> (not x.startswith('VLAN') and dk[tmp[-1]].append(x))    for x in alist
> if x != 'Interface']
>
> No need to use a nuke like itertools to kill a fly. ;-)
>
> Regards,
> mk

Oh my! You could have at least used some "if else" to make it a little
bit easier on the eyes :-)

[(dk.setdefault(x,[]) or tmp.append(x))
   if x.startswith('VLAN')
   else dk[tmp[-1]].append(x)
   for x in alist
   if x != 'Interface']


From showell30 at yahoo.com  Fri Mar  5 11:49:41 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Fri, 5 Mar 2010 08:49:41 -0800 (PST)
Subject: A "scopeguard" for Python
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<mailman.209.1267635630.23598.python-list@python.org>
	<cf51c311-7354-4e89-ab2e-45bb8b66d67d@z35g2000yqd.googlegroups.com>
	<mailman.320.1267754017.23598.python-list@python.org>
Message-ID: <d099f881-2484-48f6-838a-7718f10dd8a8@k2g2000pro.googlegroups.com>

On Mar 4, 5:04?pm, Robert Kern <robert.k... at gmail.com> wrote:
> On 2010-03-04 15:19 PM, Mike Kent wrote:
>
>
>
> > On Mar 3, 12:00 pm, Robert Kern<robert.k... at gmail.com> ?wrote:
> >> On 2010-03-03 09:39 AM, Mike Kent wrote:
>
> >>> What's the compelling use case for this vs. a simple try/finally?
>
> >>> ? ? ?original_dir = os.getcwd()
> >>> ? ? ?try:
> >>> ? ? ? ? ?os.chdir(somewhere)
> >>> ? ? ? ? ?# Do other stuff
> >>> ? ? ?finally:
> >>> ? ? ? ? ?os.chdir(original_dir)
> >>> ? ? ? ? ?# Do other cleanup
>
> >> A custom-written context manager looks nicer and can be more readable.
>
> >> from contextlib import contextmanager
> >> import os
>
> >> @contextmanager
> >> def pushd(path):
> >> ? ? ? original_dir = os.getcwd()
> >> ? ? ? os.chdir(path)
> >> ? ? ? try:
> >> ? ? ? ? ? yield
> >> ? ? ? finally:
> >> ? ? ? ? ? os.chdir(original_dir)
>
> >> with pushd(somewhere):
> >> ? ? ? ...
>
> > Robert, I like the way you think. ?That's a perfect name for that
> > context manager! ?However, you can clear one thing up for me... isn't
> > the inner try/finally superfluous? ?My understanding was that there
> > was an implicit try/finally already done which will insure that
> > everything after the yield statement was always executed.
>
> No, the try: finally: is not implicit. See the source for
> contextlib.GeneratorContextManager. When __exit__() gets an exception from the
> with: block, it will push it into the generator using its .throw() method. This
> raises the exception inside the generator at the yield statement.
>

See also:

http://docs.python.org/library/contextlib.html

The closing() helper can be used to automatically call thing.close()
even after an exception.

If you do not use the closing() helper and take on the responsibility
yourself of doing try/finally within your generator, I think you still
gain some overall simplicity:

  1) You don't need to do try/finally in your with blocks, of course.
  2) The generator itself probably reads more straightforwardly then a
hand-coded class with __enter__ and __exit__.

For point #2, I think there are probably different aesthetics.
Generators are more concise, but they are also a bit mind-bending.


From tjreedy at udel.edu  Fri Mar  5 11:57:13 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 05 Mar 2010 11:57:13 -0500
Subject: Generic singleton
In-Reply-To: <4b907b5e$0$27863$c3e8da3@news.astraweb.com>
References: <mailman.222.1267642515.23598.python-list@python.org>	<pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>	<Xns9D317DB33C63Aduncanbooth@127.0.0.1>
	<4b907b5e$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <hmrd58$qlt$1@dough.gmane.org>

On 3/4/2010 10:32 PM, Steven D'Aprano wrote:

> Python does have it's own singletons, like None, True and False.

True and False are not singletons.

 > For some reason, they behave quite differently:

Because they are quite different.

 > NoneType fails if you try to instantiate it again,

Because trying 'type(None)()' was probably judged to be more likely to 
be a bug than something useful.

 > while bool returns the appropriate existing singleton: [sic]

Branching on boolean values (which are no more singletons than 0, 1, 
...) is basic to computing.

> I wonder why NoneType doesn't just return None?

What would you have NoneType(x) do? Or the special case NoneType(None)?
The issue has come up as to whether object(x) should ignore or raise.
In 3.x, it raises.
   TypeError: object.__new__() takes no parameters
but I believe this is changed from at least some 2.x versions that 
ignored (apparently by 'accident').

Terry Jan Reedy



From robert.kern at gmail.com  Fri Mar  5 12:00:22 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 05 Mar 2010 11:00:22 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <c1ecd9a2-9cdf-408d-9743-7e1dfa05bf47@q23g2000yqd.googlegroups.com>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<mailman.209.1267635630.23598.python-list@python.org>	<cf51c311-7354-4e89-ab2e-45bb8b66d67d@z35g2000yqd.googlegroups.com>	<mailman.320.1267754017.23598.python-list@python.org>
	<c1ecd9a2-9cdf-408d-9743-7e1dfa05bf47@q23g2000yqd.googlegroups.com>
Message-ID: <hmrdb6$rgn$1@dough.gmane.org>

On 2010-03-05 10:29 AM, Mike Kent wrote:
> On Mar 4, 8:04 pm, Robert Kern<robert.k... at gmail.com>  wrote:
>
>> No, the try: finally: is not implicit. See the source for
>> contextlib.GeneratorContextManager. When __exit__() gets an exception from the
>> with: block, it will push it into the generator using its .throw() method. This
>> raises the exception inside the generator at the yield statement.
>
> Wow, I just learned something new.  My understanding of context
> managers was that the __exit__ method was guaranteed to be executed
> regardless of how the context was left.

It is. @contextmanager turns a specially-written generator into a context 
manager with an __exit__ that does different things depending on whether or not 
and exception was raised. By pushing the exception into the generator, it lets 
the author decide what to do. It may catch a subset of exceptions, or no 
exceptions, or use a finally:. They all have use cases although finally: is the 
usual one.

> I have often written my own
> context manager classes, giving them the __enter__ and __exit__
> methods.  I had mistakenly assumed that the @contextmanager decorator
> turned a generator function into a context manager with the same
> behavior as the equivalent context manager class.

Basically, it does. __exit__() is given the exception information. When you 
write such a class, you can decide what to do with the exception. You can 
silence it, immediately reraise it, conditionally reraise it, log it and then 
reraise it, etc. Pushing the exception into the generator keeps this flexibility 
and the equivalence. If it removed that choice, then it would not be equivalent.

> Now I learn that,
> no, in order to have the 'undo' code executed in the presence of an
> exception, you must write your own try/finally block in the generator
> function.
>
> This raises the question in my mind: What's the use case for using
> @contextmanager rather than wrapping your code in a context manager
> class that defines __enter__ and __exit__, if you still have to
> manager your own try/finally block?

The @contextmanager generator implementations are often shorter and easier to 
read, in my opinion, partly because they use the try: finally: syntax that most 
of us are very familiar with. I have to think less when I read it because it 
looks so similar to the equivalent code that you would normally write.

The point of context managers isn't to remove the use of try: finally: entirely, 
but to implement it once so that it can be reused cleanly. You only have to 
write the one try: finally: in the generator and reuse it simply with the with: 
statement in many places.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From lbolla at gmail.com  Fri Mar  5 12:09:08 2010
From: lbolla at gmail.com (lbolla)
Date: Fri, 5 Mar 2010 09:09:08 -0800 (PST)
Subject: loop over list and process into groups
References: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>
	<mailman.344.1267795628.23598.python-list@python.org>
Message-ID: <8de6ccfb-c096-4f16-ad99-1bce5dfb12d0@j27g2000yqn.googlegroups.com>

On Mar 5, 1:26?pm, mk <mrk... at gmail.com> wrote:
> Sneaky Wombat wrote:
> > [ 'VLAN4065',
> > ?'Interface',
> > ?'Gi9/6',
> > ?'Po2',
> > ?'Po3',
> > ?'Po306',
> > ?'VLAN4068',
> > ?'Interface',
> > ?'Gi9/6',
> > ?'VLAN4069',
> > ?'Interface',
> > ?'Gi9/6',]
>
> Hey, I just invented a cute ;-) two-liner using list comprehensions:
>
> # alist = list above
>
> tmp, dk = [], {}
> [(x.startswith('VLAN') and (dk.setdefault(x,[]) or tmp.append(x))) or
> (not x.startswith('VLAN') and dk[tmp[-1]].append(x)) ? ?for x in alist
> if x != 'Interface']
>
> No need to use a nuke like itertools to kill a fly. ;-)
>
> Regards,
> mk

It looks like Perl ;-)


From mrkafk at gmail.com  Fri Mar  5 12:10:54 2010
From: mrkafk at gmail.com (mk)
Date: Fri, 05 Mar 2010 18:10:54 +0100
Subject: loop over list and process into groups
In-Reply-To: <7a1d6fe9-d2c8-4c7e-8173-1e6b4d010f6a@g26g2000yqn.googlegroups.com>
References: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>	<mailman.344.1267795628.23598.python-list@python.org>
	<7a1d6fe9-d2c8-4c7e-8173-1e6b4d010f6a@g26g2000yqn.googlegroups.com>
Message-ID: <hmrdut$tvp$1@dough.gmane.org>

nn wrote:

> Oh my! You could have at least used some "if else" to make it a little
> bit easier on the eyes :-)

That's my entry into """'Obfuscated' "Python" '"''code''"' 
'"contest"'""" and I'm proud of it. ;-)

Regards,
mk



From mrkafk at gmail.com  Fri Mar  5 12:14:16 2010
From: mrkafk at gmail.com (mk)
Date: Fri, 05 Mar 2010 18:14:16 +0100
Subject: isinstance(False, int)
Message-ID: <hmre56$tvp$2@dough.gmane.org>

 >>> isinstance(False, int)
True
 >>>
 >>> isinstance(True, int)
True

Huh?

 >>>
 >>> issubclass(bool, int)
True

Huh?!

Regards,
mk





From mrkafk at gmail.com  Fri Mar  5 12:16:12 2010
From: mrkafk at gmail.com (mk)
Date: Fri, 05 Mar 2010 18:16:12 +0100
Subject: loop over list and process into groups
In-Reply-To: <8de6ccfb-c096-4f16-ad99-1bce5dfb12d0@j27g2000yqn.googlegroups.com>
References: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>	<mailman.344.1267795628.23598.python-list@python.org>
	<8de6ccfb-c096-4f16-ad99-1bce5dfb12d0@j27g2000yqn.googlegroups.com>
Message-ID: <hmre8r$tvp$3@dough.gmane.org>

lbolla wrote:
> It looks like Perl ;-)

A positive proof that you can write perl code in Python. I, for 
instance, have had my brain warped by C and tend to write C-like code in 
Python. That's only half a joke, sadly. I'm trying to change my habits 
but it's hard.

Regards,
mk




From tjreedy at udel.edu  Fri Mar  5 12:17:43 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 05 Mar 2010 12:17:43 -0500
Subject: comparing two lists
In-Reply-To: <d817b4e1-192b-40e6-9a9d-75c3cbbd4ccd@t31g2000prh.googlegroups.com>
References: <d817b4e1-192b-40e6-9a9d-75c3cbbd4ccd@t31g2000prh.googlegroups.com>
Message-ID: <hmrebl$u8a$1@dough.gmane.org>

On 3/5/2010 3:05 AM, jimgardener wrote:
> hi
> I have two lists of names.I need to find the difference between these
> two lists.I tried to do it using sets.But I am wondering if there is a
> better way to do it.Please tell me if there is a more elegant way.
> thanks,
> jim
>
> my code snippet follows..
>
> oldlst=['jon','arya','ned','bran']
> newlst=['jaime','jon','cersei']
>
> newlyadded=set(newlst)-set(oldlst)
> removed=set(oldlst)-set(newlst)
> unchanged=set(oldlst)&  set(newlst)

Except for the duplicate calls to set, this is fine. If order and 
duplication are irrelevant (and hashability is guaranteed), use sets to 
start with.

> print '%d were newly added= %s'%(len(newlyadded),list(newlyadded))
> print '%d were removed=%s'%(len(removed),list(removed))
> print '%d were unchanged=%s'%(len(unchanged),list(unchanged))
>
> this produces the output
> --------------
> 2 were newly added= ['jaime', 'cersei']
> 3 were removed=['ned', 'arya', 'bran']
> 1 were unchanged=['jon']




From tjreedy at udel.edu  Fri Mar  5 12:26:00 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 05 Mar 2010 12:26:00 -0500
Subject: ImportError: No module named glib
In-Reply-To: <7c857e8c1003050030x39b75c98veace4ef8eebe606a@mail.gmail.com>
References: <7c857e8c1003050030x39b75c98veace4ef8eebe606a@mail.gmail.com>
Message-ID: <hmrer7$1ov$1@dough.gmane.org>

On 3/5/2010 3:30 AM, Michael Joachimiak wrote:
> I am too new to python.
> If anybody has an idea what to do please help.
> when I use
>
> import glib
>
> in my code I get this:
>
>>>> import glib
> Traceback (most recent call last):
>    File "<stdin>", line 1, in<module>
> ImportError: No module named glib

glib is not in Python's stdlib so it must be loaded somewhere the 
interpreter can find it. Do

 >>> import sys
 >>> sys.path

and see if it is in any of the listed directories.

Perhaps you need to import pyglib?

Terry Jan Reedy

> :~$ python -V
> Python 2.6.4
>
> /usr/lib/libpyglib-2.0-python2.6.so.0.0.0 exists in version 2.18.0-0ubuntu2
>
> :~$ pkg-config glib-2.0 --cflags --libs
> -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include  -lglib-2.0




From kamil at lucem.pl  Fri Mar  5 12:44:02 2010
From: kamil at lucem.pl (Kamil Wasilewski)
Date: Fri, 5 Mar 2010 18:44:02 +0100
Subject: Escaping variable names
Message-ID: <11910654174.20100305184402@lucem.pl>

Hi,

Ive got an issue where a variable name needs to have a minus sign (-) in it.

#Python 2.6
from SOAPpy import WSDL
wsdlFile = "http://webapi.allegro.pl/uploader.php?wsdl"
server = WSDL.Proxy(wsdlFile)
server.soapproxy.config.argsOrdering = {'doGetCountries': ['country-code', 'webapi-key'] }
server.doGetCountries(country-code=COUNTRYID}, webapi-key=WEBAPIKEY)

The above method allows me to specify the order and name of variables being sent, but i have a problem since the variables have a "-" sign in the middle, is there a way to escape it in the variable name or get around the problem?

Thanks!



From steve at holdenweb.com  Fri Mar  5 13:00:09 2010
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 05 Mar 2010 13:00:09 -0500
Subject: isinstance(False, int)
In-Reply-To: <hmre56$tvp$2@dough.gmane.org>
References: <hmre56$tvp$2@dough.gmane.org>
Message-ID: <hmrgrg$8ok$1@dough.gmane.org>

mk wrote:
>>>> isinstance(False, int)
> True
>>>>
>>>> isinstance(True, int)
> True
> 
> Huh?
> 
>>>>
>>>> issubclass(bool, int)
> True
> 
> Huh?!
> 
>>> 3+True
4
>>> 3+False
3
>>>

Just a brainfart from the BDFL - he decided (around 2.2.3, IIRC) that it
would be a good ideal for Booleans to be a subclass of integers.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at REMOVE-THIS-cybersource.com.au  Fri Mar  5 13:01:11 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 18:01:11 GMT
Subject: Generic singleton
References: <mailman.222.1267642515.23598.python-list@python.org>
	<pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>
	<Xns9D317DB33C63Aduncanbooth@127.0.0.1>
	<4b907b5e$0$27863$c3e8da3@news.astraweb.com>
	<mailman.354.1267808250.23598.python-list@python.org>
Message-ID: <4b9146e6$0$27863$c3e8da3@news.astraweb.com>

On Fri, 05 Mar 2010 11:57:13 -0500, Terry Reedy wrote:

> On 3/4/2010 10:32 PM, Steven D'Aprano wrote:
> 
>> Python does have it's own singletons, like None, True and False.
> 
> True and False are not singletons.

Duotons? Doubletons?

>>> t1 = bool(1)
>>> t2 = bool(1)
>>> t1 is t2
True
>>> t1 is t2 is bool("this is also true") is bool(['so', 'is', 'this'])
True

They're described as singletons in the PEP, so if you want to argue with 
Guido, go right ahead... *grin*

http://www.python.org/dev/peps/pep-0285/



>  > For some reason, they behave quite differently:
> 
> Because they are quite different.

Well, list("hello world") and list("goodbye now") are quite different 
too, but they behave very similarly.


>  > NoneType fails if you try to instantiate it again,
> 
> Because trying 'type(None)()' was probably judged to be more likely to
> be a bug than something useful.

Obviously people are unlikely to write type(None)(), but they are likely 
to do something like:

result = call_some_function(args)
more_code_here()
blah_blah_blah()
new_obj = type(result)()
do_something_with(new_obj)

If result happens to end up being None, I'm not convinced that the caller 
would rather have an exception than get the obvious None. If result 
happened to be 0, wouldn't you rather get 0 than have it blow up? I don't 
see why None should be any different.


>  > while bool returns the appropriate existing singleton: [sic]
> 
> Branching on boolean values (which are no more singletons than 0, 1,
> ...) is basic to computing.

What does that have to do with the price of fish? I didn't mention 
anything about branching on bools.

Once a singleton class has been instantiated the first time, you have a 
choice if the user tries to instantiate it again. You can do what 
NoneType does, and raise an error. Or you can do what bool does, and 
return the existing instance.

Obviously, the behaviour of bool is far more useful. So I wonder why 
NoneType doesn't do the same.



>> I wonder why NoneType doesn't just return None?
> 
> What would you have NoneType(x) do? 

The same thing any function of zero arguments does when it gets called 
with one argument.


> Or the special case NoneType(None)?

Why would that be a special case? If NoneType takes no arguments, and you 
supply an argument, then it is an error regardless of what that argument 
happens to be.


-- 
Steven


From peloko45 at gmail.com  Fri Mar  5 13:01:40 2010
From: peloko45 at gmail.com (Joan Miller)
Date: Fri, 5 Mar 2010 10:01:40 -0800 (PST)
Subject: Slicing [N::-1]
Message-ID: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>

What does a slice as [N::-1] ?

It looks that in the first it reverses the slice and then it shows
only N items, right?

Could you add an example to get the same result without use `::` to
see it more clear?

Thanks in advance


From arnodel at googlemail.com  Fri Mar  5 13:03:49 2010
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Fri, 05 Mar 2010 18:03:49 +0000
Subject: isinstance(False, int)
References: <mailman.357.1267809307.23598.python-list@python.org>
Message-ID: <m2aaum1w8q.fsf@googlemail.com>

mk <mrkafk at gmail.com> writes:

>>>> isinstance(False, int)
> True
>>>>
>>>> isinstance(True, int)
> True
>
> Huh?
>
>>>>
>>>> issubclass(bool, int)
> True
>
> Huh?!
>
> Regards,
> mk

Yes, and:

>>> True + False
1

In fact:

>>> 1 == True
True
>>> 0 == False
True

So what's your question?

-- 
Arnaud


From apt.shansen at gmail.com  Fri Mar  5 13:06:15 2010
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Fri, 5 Mar 2010 10:06:15 -0800
Subject: isinstance(False, int)
In-Reply-To: <hmre56$tvp$2@dough.gmane.org>
References: <hmre56$tvp$2@dough.gmane.org>
Message-ID: <7a9c25c21003051006q571c5e45r49c47e82fe2a2f7f@mail.gmail.com>

On Fri, Mar 5, 2010 at 9:14 AM, mk <mrkafk at gmail.com> wrote:

> >>> isinstance(False, int)
> True
> >>>
> >>> isinstance(True, int)
> True
>
> Huh?
>
> >>>
> >>> issubclass(bool, int)
> True
>
> Huh?!
>

Huh, what?

http://www.python.org/dev/peps/pep-0285/

--S
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From steve at REMOVE-THIS-cybersource.com.au  Fri Mar  5 13:07:29 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 18:07:29 GMT
Subject: isinstance(False, int)
References: <mailman.357.1267809307.23598.python-list@python.org>
Message-ID: <4b914860$0$27863$c3e8da3@news.astraweb.com>

On Fri, 05 Mar 2010 18:14:16 +0100, mk wrote:

>>>> isinstance(False, int)
> True
>  >>>
>  >>> isinstance(True, int)
> True
> 
> Huh?

Yes. Do you have an actual question?


>  >>> issubclass(bool, int)
> True
> 
> Huh?!

Exactly.

Bools are a late-comer to Python. For historical and implementation 
reasons, they are a subclass of int, because it was normal for people to 
use 0 and 1 as boolean flags, and so making False == 0 and True == 1 was 
the least likely to break code.

E.g. back in the day, you would have something like:

{2:None}.has_key(2) -> 1

So folks would do:

print "The key is", ["missing", "present"][d.has_key(key)]

Which still works even now that has_key returns True or False rather than 
1 or 0.


-- 
Steven


From arnodel at googlemail.com  Fri Mar  5 13:12:05 2010
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Fri, 05 Mar 2010 18:12:05 +0000
Subject: Slicing [N::-1]
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>
Message-ID: <m2wrxqzlhm.fsf@googlemail.com>

Joan Miller <peloko45 at gmail.com> writes:

> What does a slice as [N::-1] ?
>
> It looks that in the first it reverses the slice and then it shows
> only N items, right?
>
> Could you add an example to get the same result without use `::` to
> see it more clear?
>
> Thanks in advance

>>> l = range(10)
>>> l
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> l[7::-1]
[7, 6, 5, 4, 3, 2, 1, 0]
>>> [l[i] for i in range(7, -1, -1)]
[7, 6, 5, 4, 3, 2, 1, 0]

-- 
Arnaud


From jeanmichel at sequans.com  Fri Mar  5 13:14:30 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 05 Mar 2010 19:14:30 +0100
Subject: Escaping variable names
In-Reply-To: <11910654174.20100305184402@lucem.pl>
References: <11910654174.20100305184402@lucem.pl>
Message-ID: <4B914A06.8010204@sequans.com>

Kamil Wasilewski wrote:
> Hi,
>
> Ive got an issue where a variable name needs to have a minus sign (-) in it.
>
> #Python 2.6
> from SOAPpy import WSDL
> wsdlFile = "http://webapi.allegro.pl/uploader.php?wsdl"
> server = WSDL.Proxy(wsdlFile)
> server.soapproxy.config.argsOrdering = {'doGetCountries': ['country-code', 'webapi-key'] }
> server.doGetCountries(country-code=COUNTRYID}, webapi-key=WEBAPIKEY)
>
> The above method allows me to specify the order and name of variables being sent, but i have a problem since the variables have a "-" sign in the middle, is there a way to escape it in the variable name or get around the problem?
>
> Thanks!
>
>   
def foo(*args, **kwargs):
    print kwargs['country-code']

params = {'country-code': 'hello word'}   

foo(**params)


JM


From sjdevnull at yahoo.com  Fri Mar  5 13:19:37 2010
From: sjdevnull at yahoo.com (sjdevnull at yahoo.com)
Date: Fri, 5 Mar 2010 10:19:37 -0800 (PST)
Subject: Evaluate my first python script, please
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
	<mailman.335.1267780414.23598.python-list@python.org>
	<75a58067-9554-496b-ba38-1a3a8023d866@w27g2000pre.googlegroups.com>
Message-ID: <a0b34928-e247-4efd-81f8-0d271165fa10@y11g2000yqh.googlegroups.com>

On Mar 5, 10:53?am, Pete Emerson <pemer... at gmail.com> wrote:
> Thanks for your response, further questions inline.
>
> On Mar 4, 11:07?am, Tim Wintle <tim.win... at teamrubber.com> wrote:
>
> > On Thu, 2010-03-04 at 10:39 -0800, Pete Emerson wrote:
> > > I am looking for advice along the lines of "an easier way to do this"
> > > or "a more python way" (I'm sure that's asking for trouble!) or
> > > "people commonly do this instead" or "here's a slick trick" or "oh,
> > > interesting, here's my version to do the same thing".
>
> > (1) I would wrap it all in a function
>
> > def main():
> > ? ? # your code here
>
> > if __name__ == "__main__":
> > ? ? main()
>
> Is this purely aesthetic reasons, or will I appreciate this when I
> write my own modules, or something else?

Suppose the above code is in mymodule.py.  By wrapping main() you can:
1. Have another module do:
import mymodule
... (so some stuff, perhaps munge sys.argv)
mymodule.main()
2. If mymodule has a small function in it, someone else can import it
and call that function
3. You can run pylint, pychecker and other source-code checkers that
need to be able to import your module to check it (I wouldn't be
surprised if recent versions of one or the other of those don't
require imports, and some checkers like pyflakes certainly don't).
4. You can easily have a unit tester call into the module

etc.

> > (2) PEP8 (python style guidelines) suggests one import per line
>
> > (3) I'd use four spaces as tab width

+1 on both; it's good to get into the habit of writing standard-
looking Python code.


From steve at REMOVE-THIS-cybersource.com.au  Fri Mar  5 13:22:59 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 18:22:59 GMT
Subject: Slicing [N::-1]
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>
Message-ID: <4b914c02$0$27863$c3e8da3@news.astraweb.com>

On Fri, 05 Mar 2010 10:01:40 -0800, Joan Miller wrote:

> What does a slice as [N::-1] ?

Why don't you try it?

>>> s = "abcdefgh"
>>> s[4::-1]
'edcba'

The rules for extended slicing are not explained very well in the docs, 
and can be confusing. In my experience, apart from [::-1] it is best to 
always use a positive stride (the third number).


-- 
Steven


From darkrho at gmail.com  Fri Mar  5 13:27:48 2010
From: darkrho at gmail.com (Rolando Espinoza La Fuente)
Date: Fri, 5 Mar 2010 14:27:48 -0400
Subject: isinstance(False, int)
In-Reply-To: <hmrgrg$8ok$1@dough.gmane.org>
References: <hmre56$tvp$2@dough.gmane.org> <hmrgrg$8ok$1@dough.gmane.org>
Message-ID: <4eca3f41003051027nb22f3daxc418eeda3ad0a83b@mail.gmail.com>

On Fri, Mar 5, 2010 at 2:00 PM, Steve Holden <steve at holdenweb.com> wrote:
[...]
>
> Just a brainfart from the BDFL - he decided (around 2.2.3, IIRC) that it
> would be a good ideal for Booleans to be a subclass of integers.
>

I would never figured out

>>> bool.__bases__
(<type 'int'>,)

Doesn't have side effects not knowing  that False/True are ints?

Regards,

Rolando


From steve at REMOVE-THIS-cybersource.com.au  Fri Mar  5 13:28:06 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 18:28:06 GMT
Subject: Slicing [N::-1]
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>
	<m2wrxqzlhm.fsf@googlemail.com>
Message-ID: <4b914d35$0$27863$c3e8da3@news.astraweb.com>

On Fri, 05 Mar 2010 18:12:05 +0000, Arnaud Delobelle wrote:

>>>> l = range(10)
>>>> l
> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>>> l[7::-1]
> [7, 6, 5, 4, 3, 2, 1, 0]
>>>> [l[i] for i in range(7, -1, -1)]
> [7, 6, 5, 4, 3, 2, 1, 0]

Where does the first -1 come from? Slices are supposed to have default 
values of 0 and len(seq):

>>> l[7::1]
[7, 8, 9]
>>> [l[i] for i in range(7, len(l), 1)]
[7, 8, 9]
>>> [l[i] for i in range(7, len(l), -1)]
[]


I don't believe the actual behaviour is documented anywhere.


-- 
Steven


From python at mrabarnett.plus.com  Fri Mar  5 13:30:06 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Fri, 05 Mar 2010 18:30:06 +0000
Subject: isinstance(False, int)
In-Reply-To: <hmre56$tvp$2@dough.gmane.org>
References: <hmre56$tvp$2@dough.gmane.org>
Message-ID: <4B914DAE.60209@mrabarnett.plus.com>

mk wrote:
>  >>> isinstance(False, int)
> True
>  >>>
>  >>> isinstance(True, int)
> True
> 
> Huh?
> 
>  >>>
>  >>> issubclass(bool, int)
> True
> 
> Huh?!
> 
Python didn't have Booleans originally, 0 and 1 were used instead. When
bool was introduced it was made a subclass of int so that existing code
wouldn't break.


From mrkafk at gmail.com  Fri Mar  5 13:32:32 2010
From: mrkafk at gmail.com (mk)
Date: Fri, 05 Mar 2010 19:32:32 +0100
Subject: isinstance(False, int)
In-Reply-To: <m2aaum1w8q.fsf@googlemail.com>
References: <mailman.357.1267809307.23598.python-list@python.org>
	<m2aaum1w8q.fsf@googlemail.com>
Message-ID: <hmrinv$ftq$1@dough.gmane.org>

Arnaud Delobelle wrote:

>>>> 1 == True
> True
>>>> 0 == False
> True
> 
> So what's your question?

Well nothing I'm just kind of bewildered: I'd expect smth like that in 
Perl, but not in Python.. Although I can understand the rationale after 
skimming PEP 285, I still don't like it very much.


Regards,
mk




From anand.shashwat at gmail.com  Fri Mar  5 13:33:21 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Sat, 6 Mar 2010 00:03:21 +0530
Subject: Slicing [N::-1]
In-Reply-To: <m2wrxqzlhm.fsf@googlemail.com>
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>
	<m2wrxqzlhm.fsf@googlemail.com>
Message-ID: <d4ab53de1003051033o3f2fbd10mf6b6de5ad9bdb4ba@mail.gmail.com>

On Fri, Mar 5, 2010 at 11:42 PM, Arnaud Delobelle <arnodel at googlemail.com>wrote:

> Joan Miller <peloko45 at gmail.com> writes:
>
> > What does a slice as [N::-1] ?
> >
> > It looks that in the first it reverses the slice and then it shows
> > only N items, right?
> >
> > Could you add an example to get the same result without use `::` to
> > see it more clear?
> >
> > Thanks in advance
>
> >>> l = range(10)
> >>> l
> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
> >>> l[7::-1]
> [7, 6, 5, 4, 3, 2, 1, 0]
> >>> [l[i] for i in range(7, -1, -1)]
> [7, 6, 5, 4, 3, 2, 1, 0]
>

>>> l = range(10)
>>> l
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> l[7::-1]
[7, 6, 5, 4, 3, 2, 1, 0]
>>> list(reversed(l))[-8:]
[7, 6, 5, 4, 3, 2, 1, 0]

~l0nwlf
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From mensanator at aol.com  Fri Mar  5 13:33:46 2010
From: mensanator at aol.com (Mensanator)
Date: Fri, 5 Mar 2010 10:33:46 -0800 (PST)
Subject: Slicing [N::-1]
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>
Message-ID: <464239a8-d78f-4d64-97ba-539f5c8cca26@g11g2000yqe.googlegroups.com>

On Mar 5, 12:01?pm, Joan Miller <pelok... at gmail.com> wrote:
> What does a slice as [N::-1] ?

Starts at position N and returns all items to the start of the
list in reverse order.

>
> It looks that in the first it reverses the slice and then it shows
> only N items, right?

Wrong. It shows N+1 items. Remember, counting starts from 0.

>
> Could you add an example to get the same result without use `::` to
> see it more clear?

for i in range(8,-1,-1):print(a[i],end=' ')

although I doubt this is more clear.

>
> Thanks in advance



From pemerson at gmail.com  Fri Mar  5 13:50:31 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 10:50:31 -0800 (PST)
Subject: Evaluate my first python script, please
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
	<mailman.335.1267780414.23598.python-list@python.org>
	<75a58067-9554-496b-ba38-1a3a8023d866@w27g2000pre.googlegroups.com>
	<a0b34928-e247-4efd-81f8-0d271165fa10@y11g2000yqh.googlegroups.com>
Message-ID: <e2f6cf2e-5314-4836-9f0f-690be12df8f4@t31g2000prh.googlegroups.com>

On Mar 5, 10:19?am, "sjdevn... at yahoo.com" <sjdevn... at yahoo.com> wrote:
> On Mar 5, 10:53?am, Pete Emerson <pemer... at gmail.com> wrote:
>
>
>
>
>
> > Thanks for your response, further questions inline.
>
> > On Mar 4, 11:07?am, Tim Wintle <tim.win... at teamrubber.com> wrote:
>
> > > On Thu, 2010-03-04 at 10:39 -0800, Pete Emerson wrote:
> > > > I am looking for advice along the lines of "an easier way to do this"
> > > > or "a more python way" (I'm sure that's asking for trouble!) or
> > > > "people commonly do this instead" or "here's a slick trick" or "oh,
> > > > interesting, here's my version to do the same thing".
>
> > > (1) I would wrap it all in a function
>
> > > def main():
> > > ? ? # your code here
>
> > > if __name__ == "__main__":
> > > ? ? main()
>
> > Is this purely aesthetic reasons, or will I appreciate this when I
> > write my own modules, or something else?
>
> Suppose the above code is in mymodule.py. ?By wrapping main() you can:
> 1. Have another module do:
> import mymodule
> ... (so some stuff, perhaps munge sys.argv)
> mymodule.main()
> 2. If mymodule has a small function in it, someone else can import it
> and call that function
> 3. You can run pylint, pychecker and other source-code checkers that
> need to be able to import your module to check it (I wouldn't be
> surprised if recent versions of one or the other of those don't
> require imports, and some checkers like pyflakes certainly don't).
> 4. You can easily have a unit tester call into the module
>
> etc.
>
> > > (2) PEP8 (python style guidelines) suggests one import per line
>
> > > (3) I'd use four spaces as tab width
>
> +1 on both; it's good to get into the habit of writing standard-
> looking Python code.

Agreed, noted, and appreciated, with the caveat that using spaces
instead of tabs might border on an emacs vs. vi flamewar in some
circles. I personally will use spaces going forward.


From mensanator at aol.com  Fri Mar  5 13:52:28 2010
From: mensanator at aol.com (Mensanator)
Date: Fri, 5 Mar 2010 10:52:28 -0800 (PST)
Subject: Slicing [N::-1]
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>
	<m2wrxqzlhm.fsf@googlemail.com>
	<4b914d35$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <f2b985f4-f83d-4df4-a7ab-135fc18296c7@q23g2000yqd.googlegroups.com>

On Mar 5, 12:28?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Fri, 05 Mar 2010 18:12:05 +0000, Arnaud Delobelle wrote:
> >>>> l = range(10)
> >>>> l
> > [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
> >>>> l[7::-1]
> > [7, 6, 5, 4, 3, 2, 1, 0]
> >>>> [l[i] for i in range(7, -1, -1)]
> > [7, 6, 5, 4, 3, 2, 1, 0]
>
> Where does the first -1 come from? Slices are supposed to have default
> values of 0 and len(seq):

The only way to get a 0 from a reverse range() is to have a bound of
-1.

>
> >>> l[7::1]
> [7, 8, 9]
> >>> [l[i] for i in range(7, len(l), 1)]
> [7, 8, 9]
> >>> [l[i] for i in range(7, len(l), -1)]
>
> []
>
> I don't believe the actual behaviour is documented anywhere.

Well, it's implied. If the stopping bound in a reverse range()
is greater than the starting bound, you get an empty return.

>
> --
> Steven



From jeanmichel at sequans.com  Fri Mar  5 13:54:10 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 05 Mar 2010 19:54:10 +0100
Subject: isinstance(False, int)
In-Reply-To: <4b914860$0$27863$c3e8da3@news.astraweb.com>
References: <mailman.357.1267809307.23598.python-list@python.org>
	<4b914860$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <4B915352.8010709@sequans.com>

Steven D'Aprano wrote:
> On Fri, 05 Mar 2010 18:14:16 +0100, mk wrote:
>
>   
>>>>> isinstance(False, int)
>>>>>           
>> True
>>  >>>
>>  >>> isinstance(True, int)
>> True
>>
>> Huh?
>>     
>
> Yes. Do you have an actual question?
>
>
>   
>>  >>> issubclass(bool, int)
>> True
>>
>> Huh?!
>>     
>
> Exactly.
>
> Bools are a late-comer to Python. For historical and implementation 
> reasons, they are a subclass of int, because it was normal for people to 
> use 0 and 1 as boolean flags, and so making False == 0 and True == 1 was 
> the least likely to break code.
>
> E.g. back in the day, you would have something like:
>
> {2:None}.has_key(2) -> 1
>
> So folks would do:
>
> print "The key is", ["missing", "present"][d.has_key(key)]
>
> Which still works even now that has_key returns True or False rather than 
> 1 or 0.
>
>
>   
Despite there are good reasons for bool to be int, the newcomer 'wtf' 
reaction at first glance is legitimate.
Starting python from scratch, booleans would have not been a subclass of 
int (just guessing though), 'cause it makes no sense from a design POV.
Booleans are not ints, 0 does not *mean* False and veracity is not 
quantification.


JM


From darkrho at gmail.com  Fri Mar  5 14:01:23 2010
From: darkrho at gmail.com (Rolando Espinoza La Fuente)
Date: Fri, 5 Mar 2010 15:01:23 -0400
Subject: isinstance(False, int)
In-Reply-To: <hmrinv$ftq$1@dough.gmane.org>
References: <mailman.357.1267809307.23598.python-list@python.org> 
	<m2aaum1w8q.fsf@googlemail.com> <hmrinv$ftq$1@dough.gmane.org>
Message-ID: <4eca3f41003051101q4d2c6debo1c2701d924769b31@mail.gmail.com>

On Fri, Mar 5, 2010 at 2:32 PM, mk <mrkafk at gmail.com> wrote:
> Arnaud Delobelle wrote:
>
>>>>> 1 == True
>>
>> True
>>>>>
>>>>> 0 == False
>>
>> True
>>
>> So what's your question?
>
> Well nothing I'm just kind of bewildered: I'd expect smth like that in Perl,
> but not in Python.. Although I can understand the rationale after skimming
> PEP 285, I still don't like it very much.
>

So, the pythonic way to check for True/False should be:

>>> 1 is True
False

>>> 0 is False
False

instead of ==, right?

Regards,

Rolando


From robert.kern at gmail.com  Fri Mar  5 14:10:18 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 05 Mar 2010 13:10:18 -0600
Subject: Slicing [N::-1]
In-Reply-To: <4b914d35$0$27863$c3e8da3@news.astraweb.com>
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>	<m2wrxqzlhm.fsf@googlemail.com>
	<4b914d35$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <hmrkus$pn9$1@dough.gmane.org>

On 2010-03-05 12:28 PM, Steven D'Aprano wrote:
> On Fri, 05 Mar 2010 18:12:05 +0000, Arnaud Delobelle wrote:
>
>>>>> l = range(10)
>>>>> l
>> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>>>> l[7::-1]
>> [7, 6, 5, 4, 3, 2, 1, 0]
>>>>> [l[i] for i in range(7, -1, -1)]
>> [7, 6, 5, 4, 3, 2, 1, 0]
>
> Where does the first -1 come from? Slices are supposed to have default
> values of 0 and len(seq):

Rather, they have 0 and len(seq), respectively, when the step is positive, and 
len(seq)-1 and -1 when the step is negative.

>>>> l[7::1]
> [7, 8, 9]
>>>> [l[i] for i in range(7, len(l), 1)]
> [7, 8, 9]
>>>> [l[i] for i in range(7, len(l), -1)]
> []
>
>
> I don't believe the actual behaviour is documented anywhere.

True, I don't think it is.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From alfps at start.no  Fri Mar  5 14:13:23 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Fri, 05 Mar 2010 20:13:23 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <c1ecd9a2-9cdf-408d-9743-7e1dfa05bf47@q23g2000yqd.googlegroups.com>
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<mailman.209.1267635630.23598.python-list@python.org>
	<cf51c311-7354-4e89-ab2e-45bb8b66d67d@z35g2000yqd.googlegroups.com>
	<mailman.320.1267754017.23598.python-list@python.org>
	<c1ecd9a2-9cdf-408d-9743-7e1dfa05bf47@q23g2000yqd.googlegroups.com>
Message-ID: <hmrl4p$2je$1@news.eternal-september.org>

* Mike Kent:
> On Mar 4, 8:04 pm, Robert Kern <robert.k... at gmail.com> wrote:
> 
>> No, the try: finally: is not implicit. See the source for
>> contextlib.GeneratorContextManager. When __exit__() gets an exception from the
>> with: block, it will push it into the generator using its .throw() method. This
>> raises the exception inside the generator at the yield statement.
> 
> Wow, I just learned something new.  My understanding of context
> managers was that the __exit__ method was guaranteed to be executed
> regardless of how the context was left.  I have often written my own
> context manager classes, giving them the __enter__ and __exit__
> methods.  I had mistakenly assumed that the @contextmanager decorator
> turned a generator function into a context manager with the same
> behavior as the equivalent context manager class.  Now I learn that,
> no, in order to have the 'undo' code executed in the presence of an
> exception, you must write your own try/finally block in the generator
> function.
> 
> This raises the question in my mind: What's the use case for using
> @contextmanager rather than wrapping your code in a context manager
> class that defines __enter__ and __exit__, if you still have to
> manager your own try/finally block?

Robert Kern and Steve Howell have already given given good answers.

As it happened this was news to me also, because I'm not that well-versed in 
Python and it seems contrary to the purpose of providing a simpler way to write 
a simple init-cleanup wrapper.

But additionally, if you want that, then you can define it, e.g.


<code>
# Py3

def simplecleanup( generator_func ):
     class SimpleCleanup:
         def __init__( self, *args, **kwargs ):
             self.generator = generator_func( *args, **kwargs )

         def __enter__( self ):
             self.generator.send( None )
             return self

         def __exit__( self, x_type, x_obj, x_traceback ):
             try:
                 self.generator.send( x_obj )    # x_obj is None if no exception
             except StopIteration:
                 pass                            # Expected

     return SimpleCleanup


@simplecleanup
def hello_goodbye( name ):
     print( "Hello, {}!".format( name ) )
     yield
     print( "Goodbye {}!".format( name ) )


try:
     with hello_goodbye( "Mary" ):
         print( "Talk talk talk..." )
         raise RuntimeError( "Offense" )
except:
     pass
print()


@simplecleanup
def sensitive_hello_goodbye( name ):
     print( "Hello, {}!".format( name ) )
     x = yield
     if x is not None:
         print( "Uh oh, {}!".format( x ) )
         print( "Good day {}!".format( name ) )
     else:
         print( "C u, {}!".format( name ) )


try:
     with sensitive_hello_goodbye( "Jane" ):
         print( "Talk talk talk..." )
         raise RuntimeError( "Offense" )
except:
     pass
</code>


Cheers,

- Alf


From wongjoekmeu at yahoo.com  Fri Mar  5 14:21:32 2010
From: wongjoekmeu at yahoo.com (wongjoekmeu at yahoo.com)
Date: Fri, 5 Mar 2010 11:21:32 -0800 (PST)
Subject: start function in new process
Message-ID: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>

Hello all,

I would like to run a python function completely in a new process. For
example I have a parent process. That parent process needs to start a
child process in which the function is called. After the child process
is finished however I want that the child process should stop and then
only the parent process remain. When I start the function I want to
pass arguments also which include a function reference. I tried
os.fork() as I need to write it in linux. However it seems like the
child process remain alive. I discovered this when I loop through the
function. I see that the child process continue with the loop and
starts again a new grand child untill the loop is finished. See code
snippet. f() is the function I want to run in a new process. It got as
one of the input a refence to a function c().
Function g() I called in a loop for 3 times. Now it seems that when
child process get started in the function g() it return to the loop
and it calls g() itself and starts itself a nwe child process. I do
not want thant. I want the child process to perform the function f()
and just finished. Does anyone know how I can achieve this ?


def c():
    print "function c"

def f(a,b, d):
    # function I want to run in a new child process
    print a, b
    d()

def g():
    pidID = os.fork()
    if pidID == 0:
        # child do something here
        f(2,3,c)
    else:
        # parent do something here
        print "Parent

for i in range(3):
    g()





From pemerson at gmail.com  Fri Mar  5 14:24:44 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 11:24:44 -0800 (PST)
Subject: Conditional based on whether or not a module is being used
Message-ID: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>

In a module, how do I create a conditional that will do something
based on whether or not another module has been loaded?

Suppose I have the following:

import foo
import foobar

print foo()
print foobar()

########### foo.py
def foo:
    return 'foo'

########### foobar.py
def foobar:
    if foo.has_been_loaded(): # This is not right!
        return foo() + 'bar'      # This might need to be foo.foo() ?
    else:
        return 'bar'

If someone is using foo module, I want to take advantage of its
features and use it in foobar, otherwise, I want to do something else.
In other words, I don't want to create a dependency of foobar on foo.

My failed search for solving this makes me wonder if I'm approaching
this all wrong.

Thanks in advance,
Pete


From alfps at start.no  Fri Mar  5 14:34:00 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Fri, 05 Mar 2010 20:34:00 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <dc2f6b66-73af-4510-845c-b2d014c83520@b7g2000pro.googlegroups.com>
References: <hmlu55$n1s$1@news.eternal-september.org>
	<dc2f6b66-73af-4510-845c-b2d014c83520@b7g2000pro.googlegroups.com>
Message-ID: <hmrmbd$amv$1@news.eternal-september.org>

* Steve Howell:
> On Mar 3, 7:10 am, "Alf P. Steinbach" <al... at start.no> wrote:
>> For C++ Petru Marginean once invented the "scope guard" technique (elaborated on
>> by Andrei Alexandrescu, they published an article about it in DDJ) where all you
>> need to do to ensure some desired cleanup at the end of a scope, even when the
>> scope is exited via an exception, is to declare a ScopeGuard w/desired action.
>>
>> The C++ ScopeGuard was/is for those situations where you don't have proper
>> classes with automatic cleanup, which happily is seldom the case in good C++
>> code, but languages like Java and Python don't support automatic cleanup and so
>> the use case for something like ScopeGuard is ever present.
>>
>> For use with a 'with' statement and possibly suitable 'lambda' arguments:
>>
>> <code>
>> class Cleanup:
>>      def __init__( self ):
>>          self._actions = []
>>
>>      def call( self, action ):
>>          assert( is_callable( action ) )
>>          self._actions.append( action )
>>
>>      def __enter__( self ):
>>          return self
>>
>>      def __exit__( self, x_type, x_value, x_traceback ):
>>          while( len( self._actions ) != 0 ):
>>              try:
>>                  self._actions.pop()()
>>              except BaseException as x:
>>                  raise AssertionError( "Cleanup: exception during cleanup" ) from
>> </code>
>>
>> I guess the typical usage would be what I used it for, a case where the cleanup
>> action (namely, changing back to an original directory) apparently didn't fit
>> the standard library's support for 'with', like
>>
>>    with Cleanup as at_cleanup:
>>        # blah blah
>>        chdir( somewhere )
>>        at_cleanup.call( lambda: chdir( original_dir ) )
>>        # blah blah
>>
>> Another use case might be where one otherwise would get into very deep nesting
>> of 'with' statements with every nested 'with' at the end, like a degenerate tree
>> that for all purposes is a list. Then the above, or some variant, can help to
>> /flatten/ the structure. To get rid of that silly & annoying nesting. :-)
>>
>> Cheers,
>>
>> - Alf (just sharing, it's not seriously tested code)
> 
> Hi Alf, I think I understand the notion you're going after here.  You
> have multiple cleanup steps that you want to defer till the end, and
> there is some possibility that things will go wrong along the way, but
> you want to clean up as much as you can.  And, of course, flatter is
> better.
> 
> Is this sort of what you are striving for?
> 
>     class Cleanup:
>          def __init__( self ):
>              self._actions = []
> 
>          def call( self, action ):
>              self._actions.append( action )
> 
>          def __enter__( self ):
>              return self
> 
>          def __exit__( self, x_type, x_value, x_traceback ):
>              while( len( self._actions ) != 0 ):
>                  try:
>                      self._actions.pop()()
>                  except BaseException as x:
>                      raise AssertionError( "Cleanup: exception during
> cleanup" )
> 
>     def clean_the_floor():
>         print('clean the floor')
> 
>     def carouse(num_bottles, accident):
>         with Cleanup() as at_cleanup:
>             at_cleanup.call(clean_the_floor)
>             for i in range(num_bottles):
>                 def take_down(i=i):
>                     print('take one down', i)
>                 at_cleanup.call(take_down)
>                 if i == accident:
>                     raise Exception('oops!')
>                 print ('put bottle on wall', i)
> 
>     carouse(10, None)
>     carouse(5, 3)

He he.

I think you meant:

 >     def carouse(num_bottles, accident):
 >         with Cleanup() as at_cleanup:
 >             at_cleanup.call(clean_the_floor)
 >             for i in range(num_bottles):
 >                 def take_down(i=i):
 >                     print('take one down', i)
 >                 if i == accident:
 >                     raise Exception('oops!')
 >                 print ('put bottle on wall', i)
 >                 at_cleanup.call(take_down)

I'm not sure. It's interesting & fun. But hey, it's Friday evening.

Regarding the "clean the floor", Marginean's original ScopeGuard has a 'dismiss' 
method (great for e.g. implementing transactions). There's probably also much 
other such functionality that can be added.

The original use case for Cleanup, I just posted this in case people could find 
it useful, was a harness for testing that C++ code /fails/ as it should,
<url: http://pastebin.com/NK8yVcyv>, where Cleanup is used at line 479.

Some discussion of that in Usenet message and associated thread 
<hmmcdm$p1i$1 at news.eternal-september.org>, "Unit testing of expected failures -- 
what do you use?" in [comp.lang.c++].

Another similar approach was discussed by Carlo Milanesi in <url: 
http://www.drdobbs.com/cpp/205801074>, but he supplied this reference after I'd 
done the above. Mainly the difference is that he defines a custom mark-up 
language with corresponding source preprocessing, while I use the ordinary C++ 
preprocessor. There are advantages and disadvantages to both approaches.


Cheers,

- Alf


From pemerson at gmail.com  Fri Mar  5 14:39:41 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 11:39:41 -0800 (PST)
Subject: Conditional based on whether or not a module is being used
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
Message-ID: <63c618d8-3088-48fc-abbb-9eb06bb4eb54@f17g2000prh.googlegroups.com>

On Mar 5, 11:24?am, Pete Emerson <pemer... at gmail.com> wrote:
> In a module, how do I create a conditional that will do something
> based on whether or not another module has been loaded?
>
> Suppose I have the following:
>
> import foo
> import foobar
>
> print foo()
> print foobar()
>
> ########### foo.py
> def foo:
> ? ? return 'foo'
>
> ########### foobar.py
> def foobar:
> ? ? if foo.has_been_loaded(): # This is not right!
> ? ? ? ? return foo() + 'bar' ? ? ?# This might need to be foo.foo() ?
> ? ? else:
> ? ? ? ? return 'bar'
>
> If someone is using foo module, I want to take advantage of its
> features and use it in foobar, otherwise, I want to do something else.
> In other words, I don't want to create a dependency of foobar on foo.
>
> My failed search for solving this makes me wonder if I'm approaching
> this all wrong.
>
> Thanks in advance,
> Pete

Aha, progress. Comments appreciated. Perhaps there's a different and
more conventional way of doing it than this?

def foobar():
        import sys
        if 'foomodule' in sys.modules.keys():
                import foomodule
                return foomodule.foo() + 'bar'
        else:
                return 'bar'


From martin.hellwig at dcuktec.org  Fri Mar  5 14:40:25 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Fri, 05 Mar 2010 19:40:25 +0000
Subject: start function in new process
In-Reply-To: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>
References: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>
Message-ID: <hmrmn5$d74$1@news.eternal-september.org>

On 03/05/10 19:21, wongjoekmeu at yahoo.com wrote:
<cut os.fork problem>
Any specific reason why threading.Thread or multiprocessing is not 
suitable to solve your problem?

-- 
mph



From wongjoekmeu at yahoo.com  Fri Mar  5 14:45:53 2010
From: wongjoekmeu at yahoo.com (wongjoekmeu at yahoo.com)
Date: Fri, 5 Mar 2010 11:45:53 -0800 (PST)
Subject: start function in new process
References: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>
	<hmrmn5$d74$1@news.eternal-september.org>
Message-ID: <86d891a9-b6aa-4de9-a0f5-314867fdf75d@q21g2000yqm.googlegroups.com>

On 5 mrt, 20:40, "Martin P. Hellwig" <martin.hell... at dcuktec.org>
wrote:
> On 03/05/10 19:21, wongjoek... at yahoo.com wrote:
> <cut os.fork problem>
> Any specific reason why threading.Thread or multiprocessing is not
> suitable to solve your problem?
>
> --
> mph

Because I got a memory leak in my function f(). It uses scipy, numpy,
pylab, and I am not planning to solve the memory leak because its too
complicated. So I thought of just calling the function then when it is
finished the process is gone and all memory is released. With
threading I don't think I would solve this problem. I am not sure
though.


From mrkafk at gmail.com  Fri Mar  5 14:46:43 2010
From: mrkafk at gmail.com (mk)
Date: Fri, 05 Mar 2010 20:46:43 +0100
Subject: isinstance(False, int)
In-Reply-To: <4eca3f41003051027nb22f3daxc418eeda3ad0a83b@mail.gmail.com>
References: <hmre56$tvp$2@dough.gmane.org> <hmrgrg$8ok$1@dough.gmane.org>
	<4eca3f41003051027nb22f3daxc418eeda3ad0a83b@mail.gmail.com>
Message-ID: <hmrn32$20f$1@dough.gmane.org>

Rolando Espinoza La Fuente wrote:

> Doesn't have side effects not knowing  that False/True are ints?

It does, in fact I was wondering why my iterator didn't work until I 
figured issubclass(bool, int) is true.

Regards,
mk



From steve at holdenweb.com  Fri Mar  5 14:51:39 2010
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 05 Mar 2010 14:51:39 -0500
Subject: Conditional based on whether or not a module is being used
In-Reply-To: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
Message-ID: <hmrncj$2ih$1@dough.gmane.org>

Pete Emerson wrote:
> In a module, how do I create a conditional that will do something
> based on whether or not another module has been loaded?
> 
> Suppose I have the following:
> 
> import foo
> import foobar
> 
> print foo()
> print foobar()
> 
> ########### foo.py
> def foo:
>     return 'foo'
> 
> ########### foobar.py
> def foobar:
>     if foo.has_been_loaded(): # This is not right!
>         return foo() + 'bar'      # This might need to be foo.foo() ?
>     else:
>         return 'bar'
> 
> If someone is using foo module, I want to take advantage of its
> features and use it in foobar, otherwise, I want to do something else.
> In other words, I don't want to create a dependency of foobar on foo.
> 
> My failed search for solving this makes me wonder if I'm approaching
> this all wrong.
> 
> Thanks in advance,
> Pete

One way would be

    if "foo" in sys.modules:
        # foo was imported

However that won't get you all the way, since sys.modules["foo"] will be
set even if the importing statement was

    from foo import this, that, the_other

So you might want to add

    foo = sys.modules["foo"]

inside the function.

regards
 Steve

-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Fri Mar  5 14:52:46 2010
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 05 Mar 2010 14:52:46 -0500
Subject: Conditional based on whether or not a module is being used
In-Reply-To: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
Message-ID: <hmrnen$2ih$2@dough.gmane.org>

Pete Emerson wrote:
> In a module, how do I create a conditional that will do something
> based on whether or not another module has been loaded?
> 
> Suppose I have the following:
> 
> import foo
> import foobar
> 
> print foo()
> print foobar()
> 
By the way, the above statements are never going to work, because
modules aren't callable. Maybe you want

print foo.foo()
print foobar.foobar()

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at REMOVE-THIS-cybersource.com.au  Fri Mar  5 14:53:43 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 19:53:43 GMT
Subject: Conditional based on whether or not a module is being used
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
Message-ID: <4b916146$0$27863$c3e8da3@news.astraweb.com>

On Fri, 05 Mar 2010 11:24:44 -0800, Pete Emerson wrote:

> In a module, how do I create a conditional that will do something based
> on whether or not another module has been loaded?

try:
    import foo
except ImportError:
    foo = None

def function():
    if foo:
        return foo.func()
    else:
        do_something_else()



Or, alternatively:

try:
    import foo
except ImportError:
    import alternative_foo as foo  # This better succeed!

def function():
    return foo.func()


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Fri Mar  5 14:54:22 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 19:54:22 GMT
Subject: isinstance(False, int)
References: <mailman.357.1267809307.23598.python-list@python.org>
	<m2aaum1w8q.fsf@googlemail.com> <hmrinv$ftq$1@dough.gmane.org>
	<mailman.370.1267815705.23598.python-list@python.org>
Message-ID: <4b91616d$0$27863$c3e8da3@news.astraweb.com>

On Fri, 05 Mar 2010 15:01:23 -0400, Rolando Espinoza La Fuente wrote:

> On Fri, Mar 5, 2010 at 2:32 PM, mk <mrkafk at gmail.com> wrote:
>> Arnaud Delobelle wrote:
>>
>>>>>> 1 == True
>>>
>>> True
>>>>>>
>>>>>> 0 == False
>>>
>>> True
>>>
>>> So what's your question?
>>
>> Well nothing I'm just kind of bewildered: I'd expect smth like that in
>> Perl, but not in Python.. Although I can understand the rationale after
>> skimming PEP 285, I still don't like it very much.
>>
>>
> So, the pythonic way to check for True/False should be:
> 
>>>> 1 is True
> False

Why do you need to check for True/False? 

But if you need to, yes, that is one way. Another would be:

isinstance(flag, bool)

But generally, you can use any object as a flag without caring if it is 
actually True or False.




-- 
Steven


From mrkafk at gmail.com  Fri Mar  5 14:55:14 2010
From: mrkafk at gmail.com (mk)
Date: Fri, 05 Mar 2010 20:55:14 +0100
Subject: imap vs map
Message-ID: <hmrnj1$475$1@dough.gmane.org>

Hello everyone,

I re-wrote more "slowly" an example at the end of 
http://wordaligned.org/articles/essential-python-reading-list


This example finds anagrams in the text file.

====
from itertools import groupby, imap
from operator import itemgetter

from string import ascii_lowercase, ascii_uppercase, punctuation, 
maketrans, translate

data = open(r"c:\temp\words.txt", "rt").read()

trtable = maketrans(ascii_uppercase, ascii_lowercase)

words = translate(data, trtable, deletions = punctuation)

words = list(set(words.split()))

sw = sorted(words, key=sorted)

gb = groupby(sw, sorted)

print map(list, imap(itemgetter(1), gb))
===

words.txt:
===
Word Aligned
three
space sensitive programming
Feed Logo tins
Essential Python post  Reading List
stop course there
times isnt
capes
===

Now, when I execute above, it works:

[['capes', 'space'], ['aligned'], ['reading'], ['essential'], 
['programming'], ['course'], ['feed'], ['word'], ['there', 'three'], 
['sensitive'], ['times'], ['logo'], ['python'], ['list'], ['isnt', 
'tins'], ['stop', 'post']]


However, when I change the last line to:

print map(list, map(itemgetter(1), gb))

It stops working:

[[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], ['post']]

Why? I was under impression that the only difference between map and 
imap is that imap returns iterator allowing to produce a list, while map 
returns equivalent list?

Regards,
mk





From python at mrabarnett.plus.com  Fri Mar  5 14:57:34 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Fri, 05 Mar 2010 19:57:34 +0000
Subject: Conditional based on whether or not a module is being used
In-Reply-To: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
Message-ID: <4B91622E.5000208@mrabarnett.plus.com>

Pete Emerson wrote:
> In a module, how do I create a conditional that will do something
> based on whether or not another module has been loaded?
> 
> Suppose I have the following:
> 
> import foo
> import foobar
> 
> print foo()
> print foobar()
> 
> ########### foo.py
> def foo:
>     return 'foo'
> 
> ########### foobar.py
> def foobar:
>     if foo.has_been_loaded(): # This is not right!
>         return foo() + 'bar'      # This might need to be foo.foo() ?
>     else:
>         return 'bar'
> 
> If someone is using foo module, I want to take advantage of its
> features and use it in foobar, otherwise, I want to do something else.
> In other words, I don't want to create a dependency of foobar on foo.
> 
> My failed search for solving this makes me wonder if I'm approaching
> this all wrong.
> 
Look for its name in sys.modules, for example:

     'foo' in sys.modules


From martin.hellwig at dcuktec.org  Fri Mar  5 15:02:34 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Fri, 05 Mar 2010 20:02:34 +0000
Subject: start function in new process
In-Reply-To: <86d891a9-b6aa-4de9-a0f5-314867fdf75d@q21g2000yqm.googlegroups.com>
References: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>
	<hmrmn5$d74$1@news.eternal-september.org>
	<86d891a9-b6aa-4de9-a0f5-314867fdf75d@q21g2000yqm.googlegroups.com>
Message-ID: <hmro0l$lld$1@news.eternal-september.org>

On 03/05/10 19:45, wongjoekmeu at yahoo.com wrote:
> On 5 mrt, 20:40, "Martin P. Hellwig"<martin.hell... at dcuktec.org>
> wrote:
>> On 03/05/10 19:21, wongjoek... at yahoo.com wrote:
>> <cut os.fork problem>
>> Any specific reason why threading.Thread or multiprocessing is not
>> suitable to solve your problem?
>>
>> --
>> mph
>
> Because I got a memory leak in my function f(). It uses scipy, numpy,
> pylab, and I am not planning to solve the memory leak because its too
> complicated. So I thought of just calling the function then when it is
> finished the process is gone and all memory is released. With
> threading I don't think I would solve this problem. I am not sure
> though.

I would be surprised if you can't do the same with 
subprocess/multiprocessing, since you seem to know how to identify the 
memory leak it shouldn't be a problem scripting out a test to see if it 
works this way. I would be interested though in your findings.

-- 
mph


From martin.hellwig at dcuktec.org  Fri Mar  5 15:06:09 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Fri, 05 Mar 2010 20:06:09 +0000
Subject: Conditional based on whether or not a module is being used
In-Reply-To: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
Message-ID: <hmro7c$lld$2@news.eternal-september.org>

On 03/05/10 19:24, Pete Emerson wrote:
> In a module, how do I create a conditional that will do something
> based on whether or not another module has been loaded?
<cut>>
> If someone is using foo module, I want to take advantage of its
> features and use it in foobar, otherwise, I want to do something else.
> In other words, I don't want to create a dependency of foobar on foo.
>
> My failed search for solving this makes me wonder if I'm approaching
> this all wrong.
>
> Thanks in advance,
> Pete

Hmm how about the module is available, just not imported yet, I would 
assume that you still would like to use the module then.
Perhaps playing around with the imp module might get you what you mean 
instead of what you say?

-- 
mph



From wongjoekmeu at yahoo.com  Fri Mar  5 15:09:39 2010
From: wongjoekmeu at yahoo.com (wongjoekmeu at yahoo.com)
Date: Fri, 5 Mar 2010 12:09:39 -0800 (PST)
Subject: start function in new process
References: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>
	<hmrmn5$d74$1@news.eternal-september.org>
	<86d891a9-b6aa-4de9-a0f5-314867fdf75d@q21g2000yqm.googlegroups.com>
	<hmro0l$lld$1@news.eternal-september.org>
Message-ID: <3f2cc4f0-b21a-4886-a81c-5b503610ac2d@e7g2000yqf.googlegroups.com>

On 5 mrt, 21:02, "Martin P. Hellwig" <martin.hell... at dcuktec.org>
wrote:
> On 03/05/10 19:45, wongjoek... at yahoo.com wrote:
>
>
>
> > On 5 mrt, 20:40, "Martin P. Hellwig"<martin.hell... at dcuktec.org>
> > wrote:
> >> On 03/05/10 19:21, wongjoek... at yahoo.com wrote:
> >> <cut os.fork problem>
> >> Any specific reason why threading.Thread or multiprocessing is not
> >> suitable to solve your problem?
>
> >> --
> >> mph
>
> > Because I got a memory leak in my function f(). It uses scipy, numpy,
> > pylab, and I am not planning to solve the memory leak because its too
> > complicated. So I thought of just calling the function then when it is
> > finished the process is gone and all memory is released. With
> > threading I don't think I would solve this problem. I am not sure
> > though.
>
> I would be surprised if you can't do the same with
> subprocess/multiprocessing, since you seem to know how to identify the
> memory leak it shouldn't be a problem scripting out a test to see if it
> works this way. I would be interested though in your findings.
>
> --
> mph

I can't use multiprocessing module since it comes only with python 2.6
and I am bound to python2.4. But subprocess does exist in python2.4,
but the question now is, how do I achieve that ? Any example ?


From clp2 at rebertia.com  Fri Mar  5 15:17:58 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 5 Mar 2010 12:17:58 -0800
Subject: Conditional based on whether or not a module is being used
In-Reply-To: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
Message-ID: <50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com>

On 3/5/10, Pete Emerson <pemerson at gmail.com> wrote:
> In a module, how do I create a conditional that will do something
> based on whether or not another module has been loaded?
>
> Suppose I have the following:
>
> import foo
> import foobar
>
> print foo()
> print foobar()
>
> ########### foo.py
> def foo:
>    return 'foo'
>
> ########### foobar.py
> def foobar:
>    if foo.has_been_loaded(): # This is not right!
>        return foo() + 'bar'      # This might need to be foo.foo() ?
>    else:
>        return 'bar'
>
> If someone is using foo module, I want to take advantage of its
> features and use it in foobar, otherwise, I want to do something else.
> In other words, I don't want to create a dependency of foobar on foo.
>
> My failed search for solving this makes me wonder if I'm approaching
> this all wrong.

Just try importing foo, and then catch the exception if it's not installed.

#foobar.py
try:
    import foo
except ImportError:
    FOO_PRESENT = False
else:
    FOO_PRESENT = True

if FOO_PRESENT:
    def foobar():
        return foo.foo() + 'bar'
else:
    def foobar():
        return 'bar'


You could alternately do the `if FOO_PRESENT` check inside the
function body rather than defining separate versions of the function.

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


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From pemerson at gmail.com  Fri Mar  5 15:25:37 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 12:25:37 -0800
Subject: Conditional based on whether or not a module is being used
In-Reply-To: <50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com>
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
	<50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com>
Message-ID: <14a5cd5e1003051225j1d596aa2nfe9eb1047037f19d@mail.gmail.com>

On Fri, Mar 5, 2010 at 12:17 PM, Chris Rebert <clp2 at rebertia.com> wrote:
> On 3/5/10, Pete Emerson <pemerson at gmail.com> wrote:
>> In a module, how do I create a conditional that will do something
>> based on whether or not another module has been loaded?
>>
>> Suppose I have the following:
>>
>> import foo
>> import foobar
>>
>> print foo()
>> print foobar()
>>
>> ########### foo.py
>> def foo:
>> ? ?return 'foo'
>>
>> ########### foobar.py
>> def foobar:
>> ? ?if foo.has_been_loaded(): # This is not right!
>> ? ? ? ?return foo() + 'bar' ? ? ?# This might need to be foo.foo() ?
>> ? ?else:
>> ? ? ? ?return 'bar'
>>
>> If someone is using foo module, I want to take advantage of its
>> features and use it in foobar, otherwise, I want to do something else.
>> In other words, I don't want to create a dependency of foobar on foo.
>>
>> My failed search for solving this makes me wonder if I'm approaching
>> this all wrong.
>
> Just try importing foo, and then catch the exception if it's not installed.
>
> #foobar.py
> try:
> ? ?import foo
> except ImportError:
> ? ?FOO_PRESENT = False
> else:
> ? ?FOO_PRESENT = True
>
> if FOO_PRESENT:
> ? ?def foobar():
> ? ? ? ?return foo.foo() + 'bar'
> else:
> ? ?def foobar():
> ? ? ? ?return 'bar'
>
>
> You could alternately do the `if FOO_PRESENT` check inside the
> function body rather than defining separate versions of the function.
>
> Cheers,
> Chris
> --
> http://blog.rebertia.com
>

Except I want to use the module only if the main program is using it
too, not just if it's available for use. I think that I found a way in
my follow-up post to my own message, but not sure it's the best way or
conventional.

Pete


From pemerson at gmail.com  Fri Mar  5 15:31:16 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 12:31:16 -0800 (PST)
Subject: Conditional based on whether or not a module is being used
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
	<hmro7c$lld$2@news.eternal-september.org>
Message-ID: <9769b00a-8d85-43ed-98e9-f921dc71c217@s36g2000prh.googlegroups.com>

On Mar 5, 12:06?pm, "Martin P. Hellwig" <martin.hell... at dcuktec.org>
wrote:
> On 03/05/10 19:24, Pete Emerson wrote:
>
> > In a module, how do I create a conditional that will do something
> > based on whether or not another module has been loaded?
> <cut>>
> > If someone is using foo module, I want to take advantage of its
> > features and use it in foobar, otherwise, I want to do something else.
> > In other words, I don't want to create a dependency of foobar on foo.
>
> > My failed search for solving this makes me wonder if I'm approaching
> > this all wrong.
>
> > Thanks in advance,
> > Pete
>
> Hmm how about the module is available, just not imported yet, I would
> assume that you still would like to use the module then.
> Perhaps playing around with the imp module might get you what you mean
> instead of what you say?
>
> --
> mph

I can certainly see why one might want to use it if it's available but
not yet imported. In that case I could do a try / exception block. But
in this case, I actually don't want to use the module unless the main
program is doing it too. But you've got me thinking, I need to make
sure that's really the desired behavior.

Pete


From pemerson at gmail.com  Fri Mar  5 15:31:40 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 12:31:40 -0800 (PST)
Subject: Conditional based on whether or not a module is being used
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
	<mailman.376.1267819057.23598.python-list@python.org>
Message-ID: <ec8e0912-bc85-4c51-85f5-fc855e289c1c@k6g2000prg.googlegroups.com>

On Mar 5, 11:57?am, MRAB <pyt... at mrabarnett.plus.com> wrote:
> Pete Emerson wrote:
> > In a module, how do I create a conditional that will do something
> > based on whether or not another module has been loaded?
>
> > Suppose I have the following:
>
> > import foo
> > import foobar
>
> > print foo()
> > print foobar()
>
> > ########### foo.py
> > def foo:
> > ? ? return 'foo'
>
> > ########### foobar.py
> > def foobar:
> > ? ? if foo.has_been_loaded(): # This is not right!
> > ? ? ? ? return foo() + 'bar' ? ? ?# This might need to be foo.foo() ?
> > ? ? else:
> > ? ? ? ? return 'bar'
>
> > If someone is using foo module, I want to take advantage of its
> > features and use it in foobar, otherwise, I want to do something else.
> > In other words, I don't want to create a dependency of foobar on foo.
>
> > My failed search for solving this makes me wonder if I'm approaching
> > this all wrong.
>
> Look for its name in sys.modules, for example:
>
> ? ? ?'foo' in sys.modules

Excellent, this is what I finally discovered, although I was looking
for 'foo' in sys.modules.keys(), which apparently isn't necessary.


From jgardner at jonathangardner.net  Fri Mar  5 15:39:58 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Fri, 5 Mar 2010 12:39:58 -0800
Subject: start function in new process
In-Reply-To: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>
References: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>
Message-ID: <6cc20cea1003051239h2983a3cbw68f54bcf547367a8@mail.gmail.com>

You're really close. See inline comment below.

On Fri, Mar 5, 2010 at 11:21 AM, wongjoekmeu at yahoo.com
<wongjoekmeu at yahoo.com> wrote:
>
> def c():
> ? ?print "function c"
>
> def f(a,b, d):
> ? ?# function I want to run in a new child process
> ? ?print a, b
> ? ?d()
>
> def g():
> ? ?pidID = os.fork()
> ? ?if pidID == 0:
> ? ? ? ?# child do something here
> ? ? ? ?f(2,3,c)

You'll need to exit here -- not return.
http://docs.python.org/library/os.html#os._exit

> ? ?else:
> ? ? ? ?# parent do something here
> ? ? ? ?print "Parent
>
> for i in range(3):
> ? ?g()
>

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From martin.hellwig at dcuktec.org  Fri Mar  5 15:40:55 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Fri, 05 Mar 2010 20:40:55 +0000
Subject: start function in new process
In-Reply-To: <3f2cc4f0-b21a-4886-a81c-5b503610ac2d@e7g2000yqf.googlegroups.com>
References: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>
	<hmrmn5$d74$1@news.eternal-september.org>
	<86d891a9-b6aa-4de9-a0f5-314867fdf75d@q21g2000yqm.googlegroups.com>
	<hmro0l$lld$1@news.eternal-september.org>
	<3f2cc4f0-b21a-4886-a81c-5b503610ac2d@e7g2000yqf.googlegroups.com>
Message-ID: <hmrq8j$3n8$1@news.eternal-september.org>

On 03/05/10 20:09, wongjoekmeu at yahoo.com wrote:
> On 5 mrt, 21:02, "Martin P. Hellwig"<martin.hell... at dcuktec.org>
> wrote:
>> On 03/05/10 19:45, wongjoek... at yahoo.com wrote:
>>
>>
>>
>>> On 5 mrt, 20:40, "Martin P. Hellwig"<martin.hell... at dcuktec.org>
>>> wrote:
>>>> On 03/05/10 19:21, wongjoek... at yahoo.com wrote:
>>>> <cut os.fork problem>
>>>> Any specific reason why threading.Thread or multiprocessing is not
>>>> suitable to solve your problem?
>>
>>>> --
>>>> mph
>>
>>> Because I got a memory leak in my function f(). It uses scipy, numpy,
>>> pylab, and I am not planning to solve the memory leak because its too
>>> complicated. So I thought of just calling the function then when it is
>>> finished the process is gone and all memory is released. With
>>> threading I don't think I would solve this problem. I am not sure
>>> though.
>>
>> I would be surprised if you can't do the same with
>> subprocess/multiprocessing, since you seem to know how to identify the
>> memory leak it shouldn't be a problem scripting out a test to see if it
>> works this way. I would be interested though in your findings.
>>
>> --
>> mph
>
> I can't use multiprocessing module since it comes only with python 2.6
> and I am bound to python2.4. But subprocess does exist in python2.4,
> but the question now is, how do I achieve that ? Any example ?

Sure, for example if I want to check the openssl version (didn't specify 
I need to provide a useful example :-)

I would normally do on the command line:
[martin at aspire8930 /usr/home/martin/Desktop]$ /usr/bin/openssl version
OpenSSL 0.9.8k 25 Mar 2009

The python subprocess equivalent is:
[martin at aspire8930 /usr/home/martin/Desktop]$ python
Python 2.6.4 (r264:75706, Jan 31 2010, 20:52:16)
[GCC 4.2.1 20070719  [FreeBSD]] on freebsd8
Type "help", "copyright", "credits" or "license" for more information.
 >>> import subprocess as _sp
 >>> ssl_version = _sp.Popen(['/usr/bin/openssl', 'version'], 
stdout=_sp.PIPE)
 >>> print(ssl_version.stdout.readlines())
['OpenSSL 0.9.8k 25 Mar 2009\n']
 >>> quit()
[martin at aspire8930 /usr/home/martin/Desktop]$

If you get any error in the Popen part, you probably did not use the 
full path or an illegal parameter.

If you get a long wait in the readlines part, this usually means that 
there is either nothing written to stdout or something is still being 
written (I am not sure about this part though, it has been a while).

hth
-- 
mph


From robert.kern at gmail.com  Fri Mar  5 15:49:40 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 05 Mar 2010 14:49:40 -0600
Subject: start function in new process
In-Reply-To: <3f2cc4f0-b21a-4886-a81c-5b503610ac2d@e7g2000yqf.googlegroups.com>
References: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>	<hmrmn5$d74$1@news.eternal-september.org>	<86d891a9-b6aa-4de9-a0f5-314867fdf75d@q21g2000yqm.googlegroups.com>	<hmro0l$lld$1@news.eternal-september.org>
	<3f2cc4f0-b21a-4886-a81c-5b503610ac2d@e7g2000yqf.googlegroups.com>
Message-ID: <hmrqp4$fk3$1@dough.gmane.org>

On 2010-03-05 14:09 PM, wongjoekmeu at yahoo.com wrote:

> I can't use multiprocessing module since it comes only with python 2.6
> and I am bound to python2.4.

It is available as a third party package for Python 2.4:

http://pypi.python.org/pypi/multiprocessing

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From jackdied at gmail.com  Fri Mar  5 15:58:01 2010
From: jackdied at gmail.com (Jack Diederich)
Date: Fri, 5 Mar 2010 15:58:01 -0500
Subject: isinstance(False, int)
In-Reply-To: <4b91616d$0$27863$c3e8da3@news.astraweb.com>
References: <mailman.357.1267809307.23598.python-list@python.org>
	<m2aaum1w8q.fsf@googlemail.com> <hmrinv$ftq$1@dough.gmane.org>
	<mailman.370.1267815705.23598.python-list@python.org>
	<4b91616d$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <b8e622741003051258n29394b93q5382421fc496a82f@mail.gmail.com>

On Fri, Mar 5, 2010 at 2:54 PM, Steven D'Aprano
<steve at remove-this-cybersource.com.au> wrote:
> On Fri, 05 Mar 2010 15:01:23 -0400, Rolando Espinoza La Fuente wrote:
>
>> On Fri, Mar 5, 2010 at 2:32 PM, mk <mrkafk at gmail.com> wrote:
>>> Arnaud Delobelle wrote:
>>>
>>>>>>> 1 == True
>>>>
>>>> True
>>>>>>>
>>>>>>> 0 == False
>>>>
>>>> True
>>>>
>>>> So what's your question?
>>>
>>> Well nothing I'm just kind of bewildered: I'd expect smth like that in
>>> Perl, but not in Python.. Although I can understand the rationale after
>>> skimming PEP 285, I still don't like it very much.
>>>
>>>
>> So, the pythonic way to check for True/False should be:
>>
>>>>> 1 is True
>> False
>
> Why do you need to check for True/False?
>

You should never check for "is" False/True but always check for
equality.  The reason is that many types support the equality (__eq__)
and boolen (__bool__ in 3x) protocols.  If you check equality these
will be invoked, if you check identity ("is") they won't.

-Jack


From info at wingware.com  Fri Mar  5 16:00:48 2010
From: info at wingware.com (Wingware)
Date: Fri, 05 Mar 2010 16:00:48 -0500
Subject: ANN: Wing IDE 3.2.5 Released
Message-ID: <4B917100.9000401@wingware.com>

Hi,

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environment designed specifically for the Python programming language.

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to develop Python code for web, GUI, and embedded scripting applications.

This release includes the following minor features and improvements:

* Several vi and brief keyboard mode fixes (see change log for details)
* Support recent git versions
* Fixed output buffering on OS X for debug process and in OS Commands
* Fixed debugger support for Stackless 3.0 and 3.1
* Improve input() handling and other debugger support for Python 3.x
* Iterator support for sys.stdin
* Avoid losing focus on Debug Probe when stepping in debugger
* Fix potential for crashing debug process on certain file names
* Don't crash when copying non-ascii text in OS command output
* Added delete, duplicate, and swap line operations to Source menu
* Added rename-current-file command
* Many other minor features and bug fixes; See the change log
   at http://wingware.com/pub/wingide/3.2.5/CHANGELOG.txt for details

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* Auto-completion in the editor obtains completion data from live runtime
   when the debugger is active (**)
* Perspectives: Create and save named GUI layouts and optionally 
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* Added key binding documentation to the manual
* Added Restart Debugging item in Debug menu and tool bar (**)
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* Support for debugging 64-bit Python on OS X

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change log for details: http://wingware.com/pub/wingide/3.2.5/CHANGELOG.txt

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Wing IDE Personal 3.2.5   http://wingware.com/downloads/wingide-personal/3.2

Wing IDE 101 3.2.5        http://wingware.com/downloads/wingide-101/3.2

*About Wing IDE*

Wing IDE is an integrated development environment for the Python programming
language.  It provides powerful debugging, editing, code intelligence,
testing, version control, and search capabilities that reduce 
development and
debugging time, cut down on coding errors, and make it easier to understand
and navigate Python code.

Wing IDE is available in three product levels:  Wing IDE Professional is
the full-featured Python IDE, Wing IDE Personal offers a reduced feature
set at a low price, and Wing IDE 101 is a free simplified version designed
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Wingware | Python IDE
Advancing Software Development

www.wingware.com



From clp2 at rebertia.com  Fri Mar  5 16:14:53 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 5 Mar 2010 13:14:53 -0800
Subject: Conditional based on whether or not a module is being used
In-Reply-To: <14a5cd5e1003051225j1d596aa2nfe9eb1047037f19d@mail.gmail.com>
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
	<50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com>
	<14a5cd5e1003051225j1d596aa2nfe9eb1047037f19d@mail.gmail.com>
Message-ID: <50697b2c1003051314p6d69eb41hbc407f7cf7e8866@mail.gmail.com>

On Fri, Mar 5, 2010 at 12:25 PM, Pete Emerson <pemerson at gmail.com> wrote:
> On Fri, Mar 5, 2010 at 12:17 PM, Chris Rebert <clp2 at rebertia.com> wrote:
>> On 3/5/10, Pete Emerson <pemerson at gmail.com> wrote:
>>> In a module, how do I create a conditional that will do something
>>> based on whether or not another module has been loaded?
<snip>
>>> If someone is using foo module, I want to take advantage of its
>>> features and use it in foobar, otherwise, I want to do something else.
>>> In other words, I don't want to create a dependency of foobar on foo.
>>>
>>> My failed search for solving this makes me wonder if I'm approaching
>>> this all wrong.
>>
>> Just try importing foo, and then catch the exception if it's not installed.
<snip>
> Except I want to use the module only if the main program is using it
> too, not just if it's available for use. I think that I found a way in
> my follow-up post to my own message, but not sure it's the best way or
> conventional.

What is your use case for this behavior exactly? You've piqued my curiosity.

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


From tjreedy at udel.edu  Fri Mar  5 16:25:46 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 05 Mar 2010 16:25:46 -0500
Subject: Generic singleton
In-Reply-To: <4b9146e6$0$27863$c3e8da3@news.astraweb.com>
References: <mailman.222.1267642515.23598.python-list@python.org>	<pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>	<Xns9D317DB33C63Aduncanbooth@127.0.0.1>	<4b907b5e$0$27863$c3e8da3@news.astraweb.com>	<mailman.354.1267808250.23598.python-list@python.org>
	<4b9146e6$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <hmrssp$nes$1@dough.gmane.org>

On 3/5/2010 1:01 PM, Steven D'Aprano wrote:
> On Fri, 05 Mar 2010 11:57:13 -0500, Terry Reedy wrote:
>
>> On 3/4/2010 10:32 PM, Steven D'Aprano wrote:
>>
>>> Python does have it's own singletons, like None, True and False.
>>
>> True and False are not singletons.
>
> Duotons? Doubletons?

The latter is what I use.
>
>>>> t1 = bool(1)
>>>> t2 = bool(1)
>>>> t1 is t2
> True
>>>> t1 is t2 is bool("this is also true") is bool(['so', 'is', 'this'])
> True
>
> They're described as singletons in the PEP, so if you want to argue with
> Guido, go right ahead... *grin*
> http://www.python.org/dev/peps/pep-0285/

Guido already made the argument ;-) when he followed
'The values False and True will be singletons, like None.'
with 'Because the type has two values, perhaps these should be called 
"doubletons"? '. I agree with him here.

By 'singleton', I believe he meant 'keyword constants' with guaranteed 
'isness'. Ie, "True is True' and 'False is False', like 'None is None', 
are guaranteed in the language def to be true (True) whereas '0 is 0' 
and "'' is ''" and '() is ()' are not, even if they happen to be in a 
particular implementation.

None of this determine the behavior of the respective null and boolean 
classes. If Python had the strict bools that some wanted, bool(x) would 
not be legal.

>>   >  For some reason, they behave quite differently:
>>
>> Because they are quite different.
>
> Well, list("hello world") and list("goodbye now") are quite different
> too, but they behave very similarly.
>
>
>>   >  NoneType fails if you try to instantiate it again,
>>
>> Because trying 'type(None)()' was probably judged to be more likely to
>> be a bug than something useful.

> Obviously people are unlikely to write type(None)(), but they are likely
> to do something like:
>
> result = call_some_function(args)
> more_code_here()
> blah_blah_blah()
> new_obj = type(result)()
> do_something_with(new_obj)
>
> If result happens to end up being None, I'm not convinced that the caller
> would rather have an exception than get the obvious None. If result
> happened to be 0, wouldn't you rather get 0 than have it blow up? I don't
> see why None should be any different.

This is your strongest argument. It has nothing to do in particular with 
(the dubious analogy with) bool. Here is a draft of what you might post 
to python-ideas list, or even the tracker.

"
Make type(None) return None

The built-in classes of CPython nearly all follow the (undocumented?) 
design rule that if class C has a null instance, C() returns that 
(usually unique) null (False) instance. Hence, for instance, one can write

nulls = [type(x)() for x in obs]

to map the objects in obs to their null counterparts. This works for 
object of at least the following classes: bool, int, float, complex, 
str, bytes, bytearray, tuple, list, set, frozenset, dict, 
decimal.Decimal, fractions.Fraction, collections.deque, and 
collections.defaultdict.

The one glaring exception is type(None), which raises a TypeError 
instead of returning the null value None. This anomaly could be easily 
corrected, and the rule documented in, for instance, Lib Ref 5.1. Truth 
Value Testing.

Possible objection 1: None is a special singleton.
Answer 1: False is special too, and 'bool() is False' is true.

Possible objection 2: code that depends on no return would break.
Answer 2: at least one other class was changed during the 2.x series to 
conform to the rule. (xxx which?)
"

I am pretty sure other classes *were* changed, but cannot specifically 
remember which. I would look a bit at the tracker and archives for any 
negative pronouncements between posting.

>>   >  while bool returns the appropriate existing singleton: [sic]
>>
>> Branching on boolean values (which are no more singletons than 0, 1,
>> ...) is basic to computing.
>
> What does that have to do with the price of fish? I didn't mention
> anything about branching on bools.

Every use of 'if', 'and', and 'or' implicitly calls bool, and people 
often call it explicitly. There is almost no use case, other than such 
as the above, for calling the type of None.

> Once a singleton class has been instantiated the first time, you have a
> choice if the user tries to instantiate it again. You can do what
> NoneType does, and raise an error. Or you can do what bool does, and
> return the existing instance.
>
> Obviously, the behaviour of bool is far more useful.

The behavior of bool is necessary.

> So I wonder why NoneType doesn't do the same.

It predated bool by at least a decade.
The choice was pretty inconsequential, especially then, either way.

>>> I wonder why NoneType doesn't just return None?
>>
>> What would you have NoneType(x) do?
>
> The same thing any function of zero arguments does when it gets called
> with one argument.
>
>> Or the special case NoneType(None)?
>
> Why would that be a special case? If NoneType takes no arguments, and you
> supply an argument, then it is an error regardless of what that argument
> happens to be.

I agree. I asked because there were objections to correcting object(x) 
to raise instead of ignore.

Terry Jan Reedy





From tjreedy at udel.edu  Fri Mar  5 16:27:56 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 05 Mar 2010 16:27:56 -0500
Subject: isinstance(False, int)
In-Reply-To: <4B914DAE.60209@mrabarnett.plus.com>
References: <hmre56$tvp$2@dough.gmane.org> <4B914DAE.60209@mrabarnett.plus.com>
Message-ID: <hmrt0q$nes$2@dough.gmane.org>

On 3/5/2010 1:30 PM, MRAB wrote:
> mk wrote:
>> >>> isinstance(False, int)
>> True
>> >>>
>> >>> isinstance(True, int)
>> True
>>
>> Huh?
>>
>> >>>
>> >>> issubclass(bool, int)
>> True
>>
>> Huh?!
>>
> Python didn't have Booleans originally, 0 and 1 were used instead. When
> bool was introduced it was made a subclass of int so that existing code
> wouldn't break.

And because it is useful to make it so.

Terry Jan Reedy




From pemerson at gmail.com  Fri Mar  5 16:29:48 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 13:29:48 -0800 (PST)
Subject: Conditional based on whether or not a module is being used
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
	<50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com> 
	<14a5cd5e1003051225j1d596aa2nfe9eb1047037f19d@mail.gmail.com> 
	<mailman.383.1267823696.23598.python-list@python.org>
Message-ID: <f4de1c96-502a-42e7-b647-ce52d0f76f2f@u15g2000prd.googlegroups.com>

On Mar 5, 1:14?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Fri, Mar 5, 2010 at 12:25 PM, Pete Emerson <pemer... at gmail.com> wrote:
> > On Fri, Mar 5, 2010 at 12:17 PM, Chris Rebert <c... at rebertia.com> wrote:
> >> On 3/5/10, Pete Emerson <pemer... at gmail.com> wrote:
> >>> In a module, how do I create a conditional that will do something
> >>> based on whether or not another module has been loaded?
> <snip>
> >>> If someone is using foo module, I want to take advantage of its
> >>> features and use it in foobar, otherwise, I want to do something else.
> >>> In other words, I don't want to create a dependency of foobar on foo.
>
> >>> My failed search for solving this makes me wonder if I'm approaching
> >>> this all wrong.
>
> >> Just try importing foo, and then catch the exception if it's not installed.
> <snip>
> > Except I want to use the module only if the main program is using it
> > too, not just if it's available for use. I think that I found a way in
> > my follow-up post to my own message, but not sure it's the best way or
> > conventional.
>
> What is your use case for this behavior exactly? You've piqued my curiosity.
>
> Cheers,
> Chris
> --http://blog.rebertia.com

I have written my first module called "logger" that logs to syslog via
the syslog module but also allows for logging to STDOUT in debug mode
at multiple levels (to increase verbosity depending on one's need), or
both. I've looked at the logging module and while it might suit my
needs, it's overkill for me right now (I'm still *very* much a python
newbie).

I want to write other modules, and my thinking is that it makes sense
for those modules to use the "logger" module to do the logging, if and
only if the parent using the other modules is also using the logger
module.

In other words, I don't want to force someone to use the "logger"
module just so they can use my other modules, even if the "logger"
module is installed ... but I also want to take advantage of it if I'm
using it.

Now that I've written that, I'm not sure that makes a whole lot of
sense. It seems like I could say, "hey, this person has the 'logger'
module available, let's use it!".

Thoughts?


From p.c.j.kleiweg at rug.nl  Fri Mar  5 16:34:00 2010
From: p.c.j.kleiweg at rug.nl (Peter Kleiweg)
Date: Fri, 5 Mar 2010 22:34:00 +0100
Subject: How to send utf-8 mail in Python 3?
Message-ID: <alpine.DEB.1.10.1003052229230.3703@localhost>


I try to send e-mail from Python 3.1.1

Encoding as iso-8859-1 goes fine.
But encoding as utf-8 doesn't work.
What am I doing wrong?


Python 3.1.1 (r311:74480, Oct  2 2009, 11:50:52) 
[GCC 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from email.mime.text import MIMEText
>>> text = 'H\u00e9'
>>> msg = MIMEText(text, 'plain', 'iso-8859-1')
>>> print(msg.as_string())
Content-Type: text/plain; charset="iso-8859-1"
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable

H=E9
>>> msg = MIMEText(text, 'plain', 'utf-8')
Traceback (most recent call last):
  File "/my/opt/Python-3/lib/python3.1/email/message.py", line 269, in set_charset
    cte(self)
TypeError: 'str' object is not callable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/my/opt/Python-3/lib/python3.1/email/mime/text.py", line 30, in __init__
    self.set_payload(_text, _charset)
  File "/my/opt/Python-3/lib/python3.1/email/message.py", line 234, in set_payload
    self.set_charset(charset)
  File "/my/opt/Python-3/lib/python3.1/email/message.py", line 271, in set_charset
    self._payload = charset.body_encode(self._payload)
  File "/my/opt/Python-3/lib/python3.1/email/charset.py", line 380, in body_encode
    return email.base64mime.body_encode(string)
  File "/my/opt/Python-3/lib/python3.1/email/base64mime.py", line 94, in body_encode
    enc = b2a_base64(s[i:i + max_unencoded]).decode("ascii")
TypeError: must be bytes or buffer, not str
>>> 




-- 
Peter Kleiweg


From gherron at islandtraining.com  Fri Mar  5 16:42:01 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Fri, 05 Mar 2010 13:42:01 -0800
Subject: Slicing [N::-1]
In-Reply-To: <f2b985f4-f83d-4df4-a7ab-135fc18296c7@q23g2000yqd.googlegroups.com>
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>	<m2wrxqzlhm.fsf@googlemail.com>	<4b914d35$0$27863$c3e8da3@news.astraweb.com>
	<f2b985f4-f83d-4df4-a7ab-135fc18296c7@q23g2000yqd.googlegroups.com>
Message-ID: <4B917AA9.7070207@islandtraining.com>

Mensanator wrote:
> On Mar 5, 12:28 pm, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
>   
>> On Fri, 05 Mar 2010 18:12:05 +0000, Arnaud Delobelle wrote:
>>     
>>>>>> l = range(10)
>>>>>> l
>>>>>>             
>>> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>>       
>>>>>> l[7::-1]
>>>>>>             
>>> [7, 6, 5, 4, 3, 2, 1, 0]
>>>       
>>>>>> [l[i] for i in range(7, -1, -1)]
>>>>>>             
>>> [7, 6, 5, 4, 3, 2, 1, 0]
>>>       
>> Where does the first -1 come from? Slices are supposed to have default
>> values of 0 and len(seq):
>>     
>
> The only way to get a 0 from a reverse range() is to have a bound of
> -1.
>   

Not quite.  An empty second bound goes all the way to the zero index:

 >>> range(9)[2::-1]
[2, 1, 0]

Gary Herron




>   
>>>>> l[7::1]
>>>>>           
>> [7, 8, 9]
>>     
>>>>> [l[i] for i in range(7, len(l), 1)]
>>>>>           
>> [7, 8, 9]
>>     
>>>>> [l[i] for i in range(7, len(l), -1)]
>>>>>           
>> []
>>
>> I don't believe the actual behaviour is documented anywhere.
>>     
>
> Well, it's implied. If the stopping bound in a reverse range()
> is greater than the starting bound, you get an empty return.
>
>   
>> --
>> Steven
>>     
>
>   



From nyamatongwe+thunder at gmail.com  Fri Mar  5 16:45:54 2010
From: nyamatongwe+thunder at gmail.com (Neil Hodgson)
Date: Fri, 05 Mar 2010 21:45:54 GMT
Subject: Passing FILE * types using ctypes
In-Reply-To: <a83319d7-c199-4532-9816-d002f7fd7914@q16g2000yqq.googlegroups.com>
References: <a83319d7-c199-4532-9816-d002f7fd7914@q16g2000yqq.googlegroups.com>
Message-ID: <mYekn.11411$pv.3037@news-server.bigpond.net.au>

Zeeshan Quireshi:

> Hello, I'm using ctypes to wrap a library i wrote. I am trying to pass
> it a FILE *pointer, how do i open a file in Python and convert it to a
> FILE *pointer.

   For this to work, your library should have been compiled with the
same compiler as Python and possibly the same compiler options such as
choice of runtime library. Otherwise, they may differ in the content and
layout of FILE and also in behaviour. On Unix, this may not be a problem
because of the shared runtime but on Windows it can cause crashes.

   Neil


From tjreedy at udel.edu  Fri Mar  5 16:46:23 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 05 Mar 2010 16:46:23 -0500
Subject: Slicing [N::-1]
In-Reply-To: <hmrkus$pn9$1@dough.gmane.org>
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>	<m2wrxqzlhm.fsf@googlemail.com>	<4b914d35$0$27863$c3e8da3@news.astraweb.com>
	<hmrkus$pn9$1@dough.gmane.org>
Message-ID: <hmru3e$rie$1@dough.gmane.org>

On 3/5/2010 2:10 PM, Robert Kern wrote:

> Rather, they have 0 and len(seq), respectively, when the step is
> positive, and len(seq)-1 and -1 when the step is negative.

>> I don't believe the actual behaviour is documented anywhere.
>
> True, I don't think it is.

There are at least two open issues.

http://bugs.python.org/issue1446619
http://bugs.python.org/issue7460





From tjreedy at udel.edu  Fri Mar  5 16:51:25 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 05 Mar 2010 16:51:25 -0500
Subject: isinstance(False, int)
In-Reply-To: <4B915352.8010709@sequans.com>
References: <mailman.357.1267809307.23598.python-list@python.org>	<4b914860$0$27863$c3e8da3@news.astraweb.com>
	<4B915352.8010709@sequans.com>
Message-ID: <hmrucs$sjl$1@dough.gmane.org>

On 3/5/2010 1:54 PM, Jean-Michel Pichavant wrote:
> Steven D'Aprano wrote:

> Despite there are good reasons for bool to be int, the newcomer 'wtf'
> reaction at first glance is legitimate.
> Starting python from scratch, booleans would have not been a subclass of
> int (just guessing though), 'cause it makes no sense from a design POV.

You are just guessing. I would argue for what we have. An example of its 
usefulness:

 >>> scores =[True, False, True, True, False]
 >>> score = sum(scores)
 >>> score
3

Bools are also usefully used as sequence indexes.

Terry Jan Reedy





From arnodel at googlemail.com  Fri Mar  5 17:00:16 2010
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Fri, 05 Mar 2010 22:00:16 +0000
Subject: imap vs map
References: <mailman.375.1267818928.23598.python-list@python.org>
Message-ID: <m2sk8ezaxb.fsf@googlemail.com>

mk <mrkafk at gmail.com> writes:

> Hello everyone,
>
> I re-wrote more "slowly" an example at the end of
> http://wordaligned.org/articles/essential-python-reading-list
>
>
> This example finds anagrams in the text file.
>
> ====
> from itertools import groupby, imap
> from operator import itemgetter
>
> from string import ascii_lowercase, ascii_uppercase, punctuation,
> maketrans, translate
>
> data = open(r"c:\temp\words.txt", "rt").read()
>
> trtable = maketrans(ascii_uppercase, ascii_lowercase)
>
> words = translate(data, trtable, deletions = punctuation)
>
> words = list(set(words.split()))
>
> sw = sorted(words, key=sorted)
>
> gb = groupby(sw, sorted)
>
> print map(list, imap(itemgetter(1), gb))
> ===
>
> words.txt:
> ===
> Word Aligned
> three
> space sensitive programming
> Feed Logo tins
> Essential Python post  Reading List
> stop course there
> times isnt
> capes
> ===
>
> Now, when I execute above, it works:
>
> [['capes', 'space'], ['aligned'], ['reading'], ['essential'],
> ['programming'], ['course'], ['feed'], ['word'], ['there', 'three'],
> ['sensitive'], ['times'], ['logo'], ['python'], ['list'], ['isnt',
> tins'], ['stop', 'post']]
>
>
> However, when I change the last line to:
>
> print map(list, map(itemgetter(1), gb))
>
> It stops working:
>
> [[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], ['post']]
>
> Why? I was under impression that the only difference between map and
> imap is that imap returns iterator allowing to produce a list, while
> map returns equivalent list?
>
> Regards,
> mk

>From the itertools docs [1]:

     The returned group is itself an iterator that shares the underlying
     iterable with groupby(). Because the source is shared, when the
     groupby() object is advanced, the previous group is no longer
     visible. So, if that data is needed later, it should be stored as a
     list:

     (example follows)

So when you use:

     print map(list, imap(itemgetter(1), gb))

each group is stored as a list *before* the groupby() object is
advanced, so that's ok.

However, when you use:

    print map(list, map(itemgetter(1), gb))

the groupby() object is advanced to the end *before* each group is
stored as a list.  According the the docs quoted above, this renders
each group no longer visible.

It is for the same reason that the following are different:

>>> def foo():
...     for i in range(5):
...         yield lambda: i
... 
>>> map(lambda f: f(), imap(lambda x: x, foo()))
[0, 1, 2, 3, 4]
>>> map(lambda f: f(), map(lambda x: x, foo()))
[4, 4, 4, 4, 4]

Although looking back at it, I don't know if this will help you :)

[1] http://docs.python.org/library/itertools.html#itertools.groupby

-- 
Arnaud


From robert.kern at gmail.com  Fri Mar  5 17:09:17 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 05 Mar 2010 16:09:17 -0600
Subject: isinstance(False, int)
In-Reply-To: <b8e622741003051258n29394b93q5382421fc496a82f@mail.gmail.com>
References: <mailman.357.1267809307.23598.python-list@python.org>	<m2aaum1w8q.fsf@googlemail.com>
	<hmrinv$ftq$1@dough.gmane.org>	<mailman.370.1267815705.23598.python-list@python.org>	<4b91616d$0$27863$c3e8da3@news.astraweb.com>
	<b8e622741003051258n29394b93q5382421fc496a82f@mail.gmail.com>
Message-ID: <hmrved$li$1@dough.gmane.org>

On 2010-03-05 14:58 PM, Jack Diederich wrote:
> On Fri, Mar 5, 2010 at 2:54 PM, Steven D'Aprano
> <steve at remove-this-cybersource.com.au>  wrote:
>> On Fri, 05 Mar 2010 15:01:23 -0400, Rolando Espinoza La Fuente wrote:
>>
>>> On Fri, Mar 5, 2010 at 2:32 PM, mk<mrkafk at gmail.com>  wrote:
>>>> Arnaud Delobelle wrote:
>>>>
>>>>>>>> 1 == True
>>>>>
>>>>> True
>>>>>>>>
>>>>>>>> 0 == False
>>>>>
>>>>> True
>>>>>
>>>>> So what's your question?
>>>>
>>>> Well nothing I'm just kind of bewildered: I'd expect smth like that in
>>>> Perl, but not in Python.. Although I can understand the rationale after
>>>> skimming PEP 285, I still don't like it very much.
>>>>
>>>>
>>> So, the pythonic way to check for True/False should be:
>>>
>>>>>> 1 is True
>>> False
>>
>> Why do you need to check for True/False?
>>
>
> You should never check for "is" False/True but always check for
> equality.  The reason is that many types support the equality (__eq__)
> and boolen (__bool__ in 3x) protocols.  If you check equality these
> will be invoked, if you check identity ("is") they won't.

It depends on what you're doing. mk seems to want to distinguish booleans from 
other objects from some reason.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From robert.kern at gmail.com  Fri Mar  5 17:12:39 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 05 Mar 2010 16:12:39 -0600
Subject: Slicing [N::-1]
In-Reply-To: <hmrkus$pn9$1@dough.gmane.org>
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>	<m2wrxqzlhm.fsf@googlemail.com>	<4b914d35$0$27863$c3e8da3@news.astraweb.com>
	<hmrkus$pn9$1@dough.gmane.org>
Message-ID: <hmrvko$1mu$1@dough.gmane.org>

On 2010-03-05 13:10 PM, Robert Kern wrote:
> On 2010-03-05 12:28 PM, Steven D'Aprano wrote:
>> On Fri, 05 Mar 2010 18:12:05 +0000, Arnaud Delobelle wrote:
>>
>>>>>> l = range(10)
>>>>>> l
>>> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>>>>> l[7::-1]
>>> [7, 6, 5, 4, 3, 2, 1, 0]
>>>>>> [l[i] for i in range(7, -1, -1)]
>>> [7, 6, 5, 4, 3, 2, 1, 0]
>>
>> Where does the first -1 come from? Slices are supposed to have default
>> values of 0 and len(seq):
>
> Rather, they have 0 and len(seq), respectively, when the step is
> positive, and len(seq)-1 and -1 when the step is negative.

Well, not entirely true. [N:-1:-1] obviously doesn't work for this. Rather, 
leaving the second argument in the slice empty means "go to the end if step > 0 
or go to the beginning if step < 0". There is no explicit translation of the 
latter because there is no numerical index for the element before the first element.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From tjreedy at udel.edu  Fri Mar  5 17:16:00 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 05 Mar 2010 17:16:00 -0500
Subject: Conditional based on whether or not a module is being used
In-Reply-To: <f4de1c96-502a-42e7-b647-ce52d0f76f2f@u15g2000prd.googlegroups.com>
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>	<50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com>
	<14a5cd5e1003051225j1d596aa2nfe9eb1047037f19d@mail.gmail.com>
	<mailman.383.1267823696.23598.python-list@python.org>
	<f4de1c96-502a-42e7-b647-ce52d0f76f2f@u15g2000prd.googlegroups.com>
Message-ID: <hmrvqu$1d0$1@dough.gmane.org>

On 3/5/2010 4:29 PM, Pete Emerson wrote:
> On Mar 5, 1:14 pm, Chris Rebert<c... at rebertia.com>  wrote:

> I want to write other modules, and my thinking is that it makes sense
> for those modules to use the "logger" module to do the logging, if and
> only if the parent using the other modules is also using the logger
> module.
>
> In other words, I don't want to force someone to use the "logger"
> module just so they can use my other modules, even if the "logger"
> module is installed ... but I also want to take advantage of it if I'm
> using it.
>
> Now that I've written that, I'm not sure that makes a whole lot of
> sense. It seems like I could say, "hey, this person has the 'logger'
> module available, let's use it!".

Except in unusual cases, where merely importing a modules uses 
substantial resources, I would say that if it is available, use it.



From aahz at pythoncraft.com  Fri Mar  5 17:45:34 2010
From: aahz at pythoncraft.com (Aahz)
Date: 5 Mar 2010 14:45:34 -0800
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com> <9c33fd40-7fe8-4274
	<7xwrxv4vv7.fsf@ruckus.brouhaha.com>
Message-ID: <hms1ie$ivs$1@panix5.panix.com>

In article <7xwrxv4vv7.fsf at ruckus.brouhaha.com>,
Paul Rubin  <no.email at nospam.invalid> wrote:
>
>ReST is another abomination that should never have gotten off the
>ground.  It is one of the reasons I react so negatively to your
>config format proposal.  It just sounds like more of the same.

Really?  What should we use instead of reST?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From steve at REMOVE-THIS-cybersource.com.au  Fri Mar  5 18:07:52 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 23:07:52 GMT
Subject: Generic singleton
References: <mailman.222.1267642515.23598.python-list@python.org>
	<pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>
	<Xns9D317DB33C63Aduncanbooth@127.0.0.1>
	<4b907b5e$0$27863$c3e8da3@news.astraweb.com>
	<mailman.354.1267808250.23598.python-list@python.org>
	<4b9146e6$0$27863$c3e8da3@news.astraweb.com>
	<mailman.384.1267824375.23598.python-list@python.org>
Message-ID: <4b918ec8$0$27863$c3e8da3@news.astraweb.com>

On Fri, 05 Mar 2010 16:25:46 -0500, Terry Reedy wrote:

> On 3/5/2010 1:01 PM, Steven D'Aprano wrote:
>> On Fri, 05 Mar 2010 11:57:13 -0500, Terry Reedy wrote:
>>
>>> On 3/4/2010 10:32 PM, Steven D'Aprano wrote:
>>>
>>>> Python does have it's own singletons, like None, True and False.
>>>
>>> True and False are not singletons.
>>
>> Duotons? Doubletons?
> 
> The latter is what I use.

The Wikipedia article on Singleton states that it is acceptable to 
generalise "Singleton" to allow multiple instances.

http://en.wikipedia.org/wiki/Singleton_pattern

While Doubleton or even Tripleton sound cute, once you get to large 
counts it all starts getting ugly and horrible. "Polyton"? Blah.


[...]
> This is your strongest argument. It has nothing to do in particular with
> (the dubious analogy with) bool. Here is a draft of what you might post
> to python-ideas list, or even the tracker.

Oh, you have misunderstood me. I'm not particularly concerned about 
NoneType's behaviour, and certainly not concerned enough to champion the 
change against any opposition (let alone through the moratorium!). I 
wanted to understand why the difference existed.

Python has at least two other singletons, Ellipsis and NotImplemented, 
and both behave like None.



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Fri Mar  5 18:09:58 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 23:09:58 GMT
Subject: isinstance(False, int)
References: <mailman.357.1267809307.23598.python-list@python.org>
	<m2aaum1w8q.fsf@googlemail.com> <hmrinv$ftq$1@dough.gmane.org>
	<mailman.370.1267815705.23598.python-list@python.org>
	<4b91616d$0$27863$c3e8da3@news.astraweb.com>
	<mailman.381.1267822684.23598.python-list@python.org>
Message-ID: <4b918f46$0$27863$c3e8da3@news.astraweb.com>

On Fri, 05 Mar 2010 15:58:01 -0500, Jack Diederich wrote:

>>> So, the pythonic way to check for True/False should be:
>>>
>>>>>> 1 is True
>>> False
>>
>> Why do you need to check for True/False?
>>
>>
> You should never check for "is" False/True but always check for
> equality.  The reason is that many types support the equality (__eq__)
> and boolen (__bool__ in 3x) protocols.  If you check equality these will
> be invoked, if you check identity ("is") they won't.

Never say never.

If you specifically want to test for True or False themselves, accepting 
no substitutes, then using "is" is the obvious way, and using "==" is 
clearly and obviously wrong because it does accept substitutes:

>>> 1.0 == True
True
>>> decimal.Decimal(0, 1) == False
True



-- 
Steven


From jackdied at gmail.com  Fri Mar  5 18:48:39 2010
From: jackdied at gmail.com (Jack Diederich)
Date: Fri, 5 Mar 2010 18:48:39 -0500
Subject: isinstance(False, int)
In-Reply-To: <4b918f46$0$27863$c3e8da3@news.astraweb.com>
References: <mailman.357.1267809307.23598.python-list@python.org>
	<m2aaum1w8q.fsf@googlemail.com> <hmrinv$ftq$1@dough.gmane.org>
	<mailman.370.1267815705.23598.python-list@python.org>
	<4b91616d$0$27863$c3e8da3@news.astraweb.com>
	<mailman.381.1267822684.23598.python-list@python.org>
	<4b918f46$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <b8e622741003051548v4adbfe97o7224143df91a6f42@mail.gmail.com>

On Fri, Mar 5, 2010 at 6:09 PM, Steven D'Aprano
<steve at remove-this-cybersource.com.au> wrote:
> On Fri, 05 Mar 2010 15:58:01 -0500, Jack Diederich wrote:
>
>>>> So, the pythonic way to check for True/False should be:
>>>>
>>>>>>> 1 is True
>>>> False
>>>
>>> Why do you need to check for True/False?
>>>
>>>
>> You should never check for "is" False/True but always check for
>> equality. ?The reason is that many types support the equality (__eq__)
>> and boolen (__bool__ in 3x) protocols. ?If you check equality these will
>> be invoked, if you check identity ("is") they won't.
>
> Never say never.
>
> If you specifically want to test for True or False themselves, accepting
> no substitutes, then using "is" is the obvious way, and using "==" is
> clearly and obviously wrong because it does accept substitutes:
>
>>>> 1.0 == True
> True
>>>> decimal.Decimal(0, 1) == False
> True


Yes, obviously if you _really_ mean to test if something has the
object identity of True or False then an "is" test is the way to go.
I'm just not sure why you would ever do that.  Also, I'm not sure how
your assertion matches up with the examples; The examples test for
equality with a float that returns true for __eq__ and a Decimal that
returns false for __eq__.  Both "1.0" and "Decimal(0, 1)" will return
False if the test is "is True" or "is False."

-Jack


From clp2 at rebertia.com  Fri Mar  5 18:59:39 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 5 Mar 2010 15:59:39 -0800
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <hms1ie$ivs$1@panix5.panix.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<7xwrxv4vv7.fsf@ruckus.brouhaha.com> <hms1ie$ivs$1@panix5.panix.com>
Message-ID: <50697b2c1003051559k1fdca9e8xd7c394f1c177eedb@mail.gmail.com>

On Fri, Mar 5, 2010 at 2:45 PM, Aahz <aahz at pythoncraft.com> wrote:
> In article <7xwrxv4vv7.fsf at ruckus.brouhaha.com>,
> Paul Rubin  <no.email at nospam.invalid> wrote:
>>
>>ReST is another abomination that should never have gotten off the
>>ground.  It is one of the reasons I react so negatively to your
>>config format proposal.  It just sounds like more of the same.
>
> Really?  What should we use instead of reST?

Markdown, Textile, or possibly Creole; reST has so little use outside of
Python as to be nearly Python-specific.
It'd be nice not to have to learn yet another markup language without good
reason.

Cheers,
Chris
--
http://blog.rebertia.com
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From mensanator at aol.com  Fri Mar  5 19:09:06 2010
From: mensanator at aol.com (Mensanator)
Date: Fri, 5 Mar 2010 16:09:06 -0800 (PST)
Subject: Slicing [N::-1]
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>
	<m2wrxqzlhm.fsf@googlemail.com>
	<4b914d35$0$27863$c3e8da3@news.astraweb.com> 
	<f2b985f4-f83d-4df4-a7ab-135fc18296c7@q23g2000yqd.googlegroups.com> 
	<mailman.386.1267825329.23598.python-list@python.org>
Message-ID: <ca702be2-3307-41a9-85b9-d1cf6a49a049@q16g2000yqq.googlegroups.com>

On Mar 5, 3:42?pm, Gary Herron <gher... at islandtraining.com> wrote:
> Mensanator wrote:
>
> > The only way to get a 0 from a reverse range() is to have a bound of
> > -1.
>
> Not quite. ?An empty second bound goes all the way to the zero index:

Not the same thing. You're using the bounds of the slice index.
I was refering to the bounds of the range() function.

>>> for a in range(9,-9,-1):print(a,end=' ')
9 8 7 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 -7 -8

To get that to stop at 0, you use a -1 as the bounds:

>>> for a in range(9,-1,-1):print(a,end=' ')
9 8 7 6 5 4 3 2 1 0

Your slice notation only works if the last (first?) number in
the range happens to be 0. What if the range bounds were variables?
You may still want to force the range's last number to be 0 by
using a constant like range(a,-1,-1) rather than just take
the last number of range(a,b,-1) by using slice notation.

>
> ?>>> range(9)[2::-1]
> [2, 1, 0]
>
> Gary Herron


From clp2 at rebertia.com  Fri Mar  5 19:18:29 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 5 Mar 2010 16:18:29 -0800
Subject: isinstance(False, int)
In-Reply-To: <hmrucs$sjl$1@dough.gmane.org>
References: <mailman.357.1267809307.23598.python-list@python.org>
	<4b914860$0$27863$c3e8da3@news.astraweb.com>
	<4B915352.8010709@sequans.com> <hmrucs$sjl$1@dough.gmane.org>
Message-ID: <50697b2c1003051618n7b37aee6t74bd8f9edc5d21f5@mail.gmail.com>

On Fri, Mar 5, 2010 at 1:51 PM, Terry Reedy <tjreedy at udel.edu> wrote:
> On 3/5/2010 1:54 PM, Jean-Michel Pichavant wrote:
>> Steven D'Aprano wrote:
>
>> Despite there are good reasons for bool to be int, the newcomer 'wtf'
>> reaction at first glance is legitimate.
>> Starting python from scratch, booleans would have not been a subclass of
>> int (just guessing though), 'cause it makes no sense from a design POV.
>
> You are just guessing. I would argue for what we have. An example of its
> usefulness:
>
>>>> scores =[True, False, True, True, False]
>>>> score = sum(scores)
>>>> score
> 3
>
> Bools are also usefully used as sequence indexes.

Arguably, these sorts of uses only require bool to be /convertible/ to
int, not to necessarily be a /subclass/ of int.

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


From gherron at islandtraining.com  Fri Mar  5 19:34:26 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Fri, 05 Mar 2010 16:34:26 -0800
Subject: Slicing [N::-1]
In-Reply-To: <ca702be2-3307-41a9-85b9-d1cf6a49a049@q16g2000yqq.googlegroups.com>
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>	<m2wrxqzlhm.fsf@googlemail.com>	<4b914d35$0$27863$c3e8da3@news.astraweb.com>
	<f2b985f4-f83d-4df4-a7ab-135fc18296c7@q23g2000yqd.googlegroups.com>
	<mailman.386.1267825329.23598.python-list@python.org>
	<ca702be2-3307-41a9-85b9-d1cf6a49a049@q16g2000yqq.googlegroups.com>
Message-ID: <4B91A312.9060608@islandtraining.com>

Mensanator wrote:
> On Mar 5, 3:42 pm, Gary Herron <gher... at islandtraining.com> wrote:
>   
>> Mensanator wrote:
>>
>>     
>>> The only way to get a 0 from a reverse range() is to have a bound of
>>> -1.
>>>       
>> Not quite.  An empty second bound goes all the way to the zero index:
>>     
>
> Not the same thing. You're using the bounds of the slice index.
> I was refering to the bounds of the range() function.
>
>   
>>>> for a in range(9,-9,-1):print(a,end=' ')
>>>>         
> 9 8 7 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 -7 -8
>
> To get that to stop at 0, you use a -1 as the bounds:
>
>   
>>>> for a in range(9,-1,-1):print(a,end=' ')
>>>>         
> 9 8 7 6 5 4 3 2 1 0
>
> Your slice notation only works if the last (first?) number in
> the range happens to be 0. What if the range bounds were variables?
> You may still want to force the range's last number to be 0 by
> using a constant like range(a,-1,-1) rather than just take
> the last number of range(a,b,-1) by using slice notation.
>   

All true  and valid of course, but I was just contridicting the "the 
ONLY way to get a 0" (emphasis mine) part of the statement.

Gary Herron



>   
>>  >>> range(9)[2::-1]
>> [2, 1, 0]
>>
>> Gary Herron
>>     



From greg.ewing at canterbury.ac.nz  Fri Mar  5 20:06:37 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sat, 06 Mar 2010 14:06:37 +1300
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <4b90bb3c$0$27863$c3e8da3@news.astraweb.com>
References: <mailman.34.1267409372.23598.python-list@python.org>	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<mailman.64.1267463648.23598.python-list@python.org>	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>	<7xljebyl56.fsf@ruckus.brouhaha.com>	<mailman.70.1267468806.23598.python-list@python.org>	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>	<7xhbozrfy4.fsf@ruckus.brouhaha.com>	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>	<7x635fdcth.fsf@ruckus.brouhaha.com>	<mailman.199.1267631220.23598.python-list@python.org>	<7xlje8lb9o.fsf@ruckus.brouhaha.com>
	<7vbiuqF4utU1@mid.individual.net>
	<4b90bb3c$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <7vdnhhFo9jU1@mid.individual.net>

Steven D'Aprano wrote:

> I use footnotes all the time[1] in plain text documents and emails. I 
> don't think there's anything bizarre about it at all.

It's not the use of footnotes I'm talking about, it's
the cryptic character sequences used to mark them up
in ReST. Nobody would come up with them on their own
without having read the fine print of an ReST manual.

-- 
Greg


From robert.kern at gmail.com  Fri Mar  5 20:08:01 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 05 Mar 2010 19:08:01 -0600
Subject: isinstance(False, int)
In-Reply-To: <b8e622741003051548v4adbfe97o7224143df91a6f42@mail.gmail.com>
References: <mailman.357.1267809307.23598.python-list@python.org>	<m2aaum1w8q.fsf@googlemail.com>
	<hmrinv$ftq$1@dough.gmane.org>	<mailman.370.1267815705.23598.python-list@python.org>	<4b91616d$0$27863$c3e8da3@news.astraweb.com>	<mailman.381.1267822684.23598.python-list@python.org>	<4b918f46$0$27863$c3e8da3@news.astraweb.com>
	<b8e622741003051548v4adbfe97o7224143df91a6f42@mail.gmail.com>
Message-ID: <hms9th$vs3$1@dough.gmane.org>

On 2010-03-05 17:48 PM, Jack Diederich wrote:
> On Fri, Mar 5, 2010 at 6:09 PM, Steven D'Aprano
> <steve at remove-this-cybersource.com.au>  wrote:
>> On Fri, 05 Mar 2010 15:58:01 -0500, Jack Diederich wrote:
>>
>>>>> So, the pythonic way to check for True/False should be:
>>>>>
>>>>>>>> 1 is True
>>>>> False
>>>>
>>>> Why do you need to check for True/False?
>>>>
>>>>
>>> You should never check for "is" False/True but always check for
>>> equality.  The reason is that many types support the equality (__eq__)
>>> and boolen (__bool__ in 3x) protocols.  If you check equality these will
>>> be invoked, if you check identity ("is") they won't.
>>
>> Never say never.
>>
>> If you specifically want to test for True or False themselves, accepting
>> no substitutes, then using "is" is the obvious way, and using "==" is
>> clearly and obviously wrong because it does accept substitutes:
>>
>>>>> 1.0 == True
>> True
>>>>> decimal.Decimal(0, 1) == False
>> True
>
>
> Yes, obviously if you _really_ mean to test if something has the
> object identity of True or False then an "is" test is the way to go.
> I'm just not sure why you would ever do that.  Also, I'm not sure how
> your assertion matches up with the examples; The examples test for
> equality with a float that returns true for __eq__ and a Decimal that
> returns false for __eq__.

No, both comparisons return True. Decimal(0,1) is equal in value to 0 (and thus 
False). Comparing it to False using __eq__ returns True.

> Both "1.0" and "Decimal(0, 1)" will return
> False if the test is "is True" or "is False."

Yes. That is exactly what he is asserting.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From no.email at nospam.invalid  Fri Mar  5 20:10:14 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Fri, 05 Mar 2010 17:10:14 -0800
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<7xwrxv4vv7.fsf@ruckus.brouhaha.com> <hms1ie$ivs$1@panix5.panix.com>
	<50697b2c1003051559k1fdca9e8xd7c394f1c177eedb@mail.gmail.com>
	<mailman.397.1267838161.23598.python-list@python.org>
Message-ID: <7xocj2fe6h.fsf@ruckus.brouhaha.com>

Robert Kern <robert.kern at gmail.com> writes:
>> Markdown, Textile, or possibly Creole;...
> I believe ReST predates all of those mentioned.

Texinfo and POD are certainly older than ReST.  I'm not sure about
MediaWiki markup, but it's gotten so much traction that Markdown
should probably be abandoned in its favor even if Markdown is older.


From robert.kern at gmail.com  Fri Mar  5 20:15:46 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 05 Mar 2010 19:15:46 -0600
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <50697b2c1003051559k1fdca9e8xd7c394f1c177eedb@mail.gmail.com>
References: <mailman.34.1267409372.23598.python-list@python.org>	<7xhbozrfy4.fsf@ruckus.brouhaha.com>	<7xwrxv4vv7.fsf@ruckus.brouhaha.com>
	<hms1ie$ivs$1@panix5.panix.com>
	<50697b2c1003051559k1fdca9e8xd7c394f1c177eedb@mail.gmail.com>
Message-ID: <hmsac3$1bv$1@dough.gmane.org>

On 2010-03-05 17:59 PM, Chris Rebert wrote:
> On Fri, Mar 5, 2010 at 2:45 PM, Aahz <aahz at pythoncraft.com
> <mailto:aahz at pythoncraft.com>> wrote:
>  > In article <7xwrxv4vv7.fsf at ruckus.brouhaha.com
> <mailto:7xwrxv4vv7.fsf at ruckus.brouhaha.com>>,
>  > Paul Rubin <no.email at nospam.invalid> wrote:
>  >>
>  >>ReST is another abomination that should never have gotten off the
>  >>ground.  It is one of the reasons I react so negatively to your
>  >>config format proposal.  It just sounds like more of the same.
>  >
>  > Really?  What should we use instead of reST?
>
> Markdown, Textile, or possibly Creole; reST has so little use outside of
> Python as to be nearly Python-specific.
> It'd be nice not to have to learn yet another markup language without
> good reason.

I believe ReST predates all of those mentioned.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From greg.ewing at canterbury.ac.nz  Fri Mar  5 20:19:03 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sat, 06 Mar 2010 14:19:03 +1300
Subject: My four-yorkshireprogrammers contribution
In-Reply-To: <mailman.294.1267719244.23598.python-list@python.org>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>	<4B8B9845.70604@sequans.com>	<mailman.59.1267456634.23598.python-list@python.org>	<7v695nFa0fU1@mid.individual.net>	<mailman.189.1267627321.23598.python-list@python.org>	<7v9e3rFl7mU1@mid.individual.net>
	<mailman.294.1267719244.23598.python-list@python.org>
Message-ID: <7vdo8sFrelU1@mid.individual.net>

MRAB wrote:

> By the standards of just a few years later, that's not so much a
> microcomputer as a nanocomputer!

Although not quite as nano as another design published
in EA a couple of years earlier, the EDUC-8:

   http://www.sworld.com.au/steven/educ-8/

It had a *maximum* of 256 bytes -- due to the architecture,
there was no way of addressing any more. Also it was
divided into 16-byte pages, with indirect addressing
required to access anything in a different page from
the instruction. Programming for it must have been
rather challenging.

As far as I know, the EDUC-8 is unique in being the
only computer design ever published in a hobby magazine
that *wasn't* based on a microprocessor -- it was all
built out of 9000 and 7400 series TTL logic chips!

-- 
Greg


From pemerson at gmail.com  Fri Mar  5 20:22:14 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 17:22:14 -0800 (PST)
Subject: best practices: is collections.defaultdict my friend or not?
Message-ID: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>

I've been wrestling with dicts. I hope at the very least what I
discovered helps someone else out, but I'm interested in hearing from
more learned python users.

I found out that adding a two dimensional element without defining
first dimension existing doesn't work:

>>> data = {}
>>> data['one']['two'] = 'three'
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
KeyError: 'one'
>>> data['one'] = {}
>>> data['one']['two'] = 'three'
>>> print data
{'one': {'two': 'three'}}

And through some research, I discovered collections.defaultdict (new
in Python 2.5, FWIW):

>>> import collections
>>> data = collections.defaultdict(dict)
>>> data['one']['two'] = 'three'
>>> print data
defaultdict(<type 'dict'>, {'one': {'two': 'three'}})

Why isn't the behavior of collections.defaultdict the default for a
dict?
Am I just revelling in my bad perl habits by not wanting to declare a
previous level first?
Is this sort of "more rigid" way of doing things common throughout
python, and is it best that I not fight it, but embrace it?

Your thoughts and comments are very much appreciated. I think my brain
already knows some of the answers, but my heart ... well, perl and I
go way back. Loving python so far, though.

Pete


From greg.ewing at canterbury.ac.nz  Fri Mar  5 20:39:25 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sat, 06 Mar 2010 14:39:25 +1300
Subject: Generic singleton
In-Reply-To: <4b9146e6$0$27863$c3e8da3@news.astraweb.com>
References: <mailman.222.1267642515.23598.python-list@python.org>	<pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>	<Xns9D317DB33C63Aduncanbooth@127.0.0.1>	<4b907b5e$0$27863$c3e8da3@news.astraweb.com>	<mailman.354.1267808250.23598.python-list@python.org>
	<4b9146e6$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <7vdpf2FqgU1@mid.individual.net>

I think the important difference between None and booleans
wrt singleton behaviour is that things are often compared
with None using "is", so it's quite important that there
only be one instance of NoneType around, and it makes
sense not to give people the false impression that they
can create another one.

Re-using predefined True and False instances is more of
a performance optimisation, however -- they're not usually
compared for identity, or even compared at all for that
matter. So there's no particular reason to disallow
calling bool().

In fact, there's an excellent reason to *allow* calling
it: not only is bool a type, it's also often used as a
function to coerce things to a boolean value:

    >>> bool(['hello'])
    True

There's no equivalent reason to make NoneType callable,
as coercing something to None makes very little sense.

-- 
Greg


From greg.ewing at canterbury.ac.nz  Fri Mar  5 20:45:58 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sat, 06 Mar 2010 14:45:58 +1300
Subject: Generic singleton
In-Reply-To: <4b918ec8$0$27863$c3e8da3@news.astraweb.com>
References: <mailman.222.1267642515.23598.python-list@python.org>	<pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>	<Xns9D317DB33C63Aduncanbooth@127.0.0.1>	<4b907b5e$0$27863$c3e8da3@news.astraweb.com>	<mailman.354.1267808250.23598.python-list@python.org>	<4b9146e6$0$27863$c3e8da3@news.astraweb.com>	<mailman.384.1267824375.23598.python-list@python.org>
	<4b918ec8$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <7vdpraF2glU1@mid.individual.net>

Steven D'Aprano wrote:

> While Doubleton or even Tripleton sound cute, once you get to large 
> counts it all starts getting ugly and horrible. "Polyton"? Blah.

Tupleton?

-- 
Greg


From usenot at geekmail.INVALID  Fri Mar  5 21:02:58 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Sat, 6 Mar 2010 03:02:58 +0100
Subject: best practices: is collections.defaultdict my friend or not?
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
Message-ID: <20100306030258.01d324b7@geekmail.INVALID>

On Fri, 5 Mar 2010 17:22:14 -0800 (PST) Pete Emerson
<pemerson at gmail.com> wrote:

> I've been wrestling with dicts. I hope at the very least what I
> discovered helps someone else out, but I'm interested in hearing from
> more learned python users.
> 
> I found out that adding a two dimensional element without defining
> first dimension existing doesn't work:
> 
> >>> data = {}
> >>> data['one']['two'] = 'three'
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> KeyError: 'one'
Yeah, because that key 'one' indexes what exactly?


> [snip]
> 
> And through some research, I discovered collections.defaultdict (new
> in Python 2.5, FWIW):
> 
> [snip]
> 
> Why isn't the behavior of collections.defaultdict the default for a
> dict?
Because explicit is better than implicit. How should Python know what
you want to fill your dict with? It could be anything that takes string
indices. Only two lines of code remove all the guesswork.


> Am I just revelling in my bad perl habits by not wanting to declare a
> previous level first?
Yes.

Python pretty much never guesses (not that I knew of anyway). I think
that is good, because it's just too easy to overlook some magic the
language does and spend an hour trying to understand why that Toyota
hit that wall.


> Is this sort of "more rigid" way of doing things common throughout
> python, and is it best that I not fight it, but embrace it?
> 
Seriously, what answer do you expect? ;) When has fighting a language
ever brought about something really cool. (I'm really looking forward
to the geeky humorous replies this is bound to sprout.)



> Your thoughts and comments are very much appreciated. I think my brain
> already knows some of the answers, but my heart ... well, perl and I
> go way back. Loving python so far, though.
> 
Welcome on board.

Have you typed "import this" in the command prompt yet?



-- 
INVALID? DE!



From mensanator at aol.com  Fri Mar  5 21:09:59 2010
From: mensanator at aol.com (Mensanator)
Date: Fri, 5 Mar 2010 18:09:59 -0800 (PST)
Subject: Slicing [N::-1]
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>
	<m2wrxqzlhm.fsf@googlemail.com>
	<4b914d35$0$27863$c3e8da3@news.astraweb.com> 
	<f2b985f4-f83d-4df4-a7ab-135fc18296c7@q23g2000yqd.googlegroups.com> 
	<mailman.386.1267825329.23598.python-list@python.org>
	<ca702be2-3307-41a9-85b9-d1cf6a49a049@q16g2000yqq.googlegroups.com>
	<mailman.395.1267835669.23598.python-list@python.org>
Message-ID: <83e3ccd0-29d6-4aec-8590-a38e6daba56d@g26g2000yqn.googlegroups.com>

On Mar 5, 6:34?pm, Gary Herron <gher... at islandtraining.com> wrote:
> Mensanator wrote:
> > On Mar 5, 3:42 pm, Gary Herron <gher... at islandtraining.com> wrote:
>
> >> Mensanator wrote:
>
> >>> The only way to get a 0 from a reverse range() is to have a bound of
> >>> -1.
>
> >> Not quite. ?An empty second bound goes all the way to the zero index:
>
> > Not the same thing. You're using the bounds of the slice index.
> > I was refering to the bounds of the range() function.
>
> >>>> for a in range(9,-9,-1):print(a,end=' ')
>
> > 9 8 7 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 -7 -8
>
> > To get that to stop at 0, you use a -1 as the bounds:
>
> >>>> for a in range(9,-1,-1):print(a,end=' ')
>
> > 9 8 7 6 5 4 3 2 1 0
>
> > Your slice notation only works if the last (first?) number in
> > the range happens to be 0. What if the range bounds were variables?
> > You may still want to force the range's last number to be 0 by
> > using a constant like range(a,-1,-1) rather than just take
> > the last number of range(a,b,-1) by using slice notation.
>
> All true ?and valid of course, but I was just contridicting the "the
> ONLY way to get a 0" (emphasis mine) part of the statement.

Does it still contradict if you do not use the '::' as the OP
requested?

>
> Gary Herron
>
>
>
>
>
> >> ?>>> range(9)[2::-1]
> >> [2, 1, 0]
>
> >> Gary Herron- Hide quoted text -
>
> - Show quoted text -- Hide quoted text -
>
> - Show quoted text -



From usenot at geekmail.INVALID  Fri Mar  5 21:10:03 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Sat, 6 Mar 2010 03:10:03 +0100
Subject: best practices: is collections.defaultdict my friend or not?
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
Message-ID: <20100306031003.1018aab2@geekmail.INVALID>

On Fri, 5 Mar 2010 17:22:14 -0800 (PST) Pete Emerson
<pemerson at gmail.com> wrote:

> [snip]
> >>> data['one'] = {}
> >>> data['one']['two'] = 'three'
> >>> print data
> {'one': {'two': 'three'}}
> 
> And through some research, I discovered collections.defaultdict (new
> in Python 2.5, FWIW):
> 
> >>> import collections
> >>> data = collections.defaultdict(dict)
> >>> data['one']['two'] = 'three'
> >>> print data
> defaultdict(<type 'dict'>, {'one': {'two': 'three'}})
> 
> [snip]
> Your thoughts and comments are very much appreciated. I think my brain
> already knows some of the answers, but my heart ... well, perl and I
> go way back. Loving python so far, though.
> 

Oh, by the way: That defaultdict route is a pretty solid solution. Not
sure what problem you're trying to solve -- depending on your usecase,
there might be a better approach.

If you're just asking hypothetically and you're trying to apply a
Perl idiom to Python, there probably *is* a better solution.

/W

-- 
INVALID? DE!



From ckaynor at zindagigames.com  Fri Mar  5 21:20:42 2010
From: ckaynor at zindagigames.com (Chris Kaynor)
Date: Fri, 5 Mar 2010 18:20:42 -0800
Subject: best practices: is collections.defaultdict my friend or not?
In-Reply-To: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
Message-ID: <a03c8d051003051820g5e7863d8t82a2a4886db6949@mail.gmail.com>

On Fri, Mar 5, 2010 at 5:22 PM, Pete Emerson <pemerson at gmail.com> wrote:

> I've been wrestling with dicts. I hope at the very least what I
> discovered helps someone else out, but I'm interested in hearing from
> more learned python users.
>
> I found out that adding a two dimensional element without defining
> first dimension existing doesn't work:
>
> >>> data = {}
> >>> data['one']['two'] = 'three'
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
> KeyError: 'one'
> >>> data['one'] = {}
> >>> data['one']['two'] = 'three'
> >>> print data
> {'one': {'two': 'three'}}
>
>
Perhaps a better idiom for what you are doing would be to use tuples as the
keys: (I don't have a handy Python interpreter, so untested)
data = {}
data[('one', 'two')] = 'three'
-------------- next part --------------
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From python at mrabarnett.plus.com  Fri Mar  5 21:26:39 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 06 Mar 2010 02:26:39 +0000
Subject: best practices: is collections.defaultdict my friend or not?
In-Reply-To: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
Message-ID: <4B91BD5F.1020304@mrabarnett.plus.com>

Pete Emerson wrote:
> I've been wrestling with dicts. I hope at the very least what I
> discovered helps someone else out, but I'm interested in hearing from
> more learned python users.
> 
> I found out that adding a two dimensional element without defining
> first dimension existing doesn't work:
> 
>>>> data = {}
>>>> data['one']['two'] = 'three'
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> KeyError: 'one'
>>>> data['one'] = {}
>>>> data['one']['two'] = 'three'
>>>> print data
> {'one': {'two': 'three'}}
> 
> And through some research, I discovered collections.defaultdict (new
> in Python 2.5, FWIW):
> 
>>>> import collections
>>>> data = collections.defaultdict(dict)
>>>> data['one']['two'] = 'three'
>>>> print data
> defaultdict(<type 'dict'>, {'one': {'two': 'three'}})
> 
> Why isn't the behavior of collections.defaultdict the default for a
> dict?
> Am I just revelling in my bad perl habits by not wanting to declare a
> previous level first?
> Is this sort of "more rigid" way of doing things common throughout
> python, and is it best that I not fight it, but embrace it?
> 
> Your thoughts and comments are very much appreciated. I think my brain
> already knows some of the answers, but my heart ... well, perl and I
> go way back. Loving python so far, though.
> 
Someone once wrote about a case where he was porting a frontend from
Perl to Python. It called a backend and parsed the result. Sometimes
converting one of the fields to a number would raise a ValueError
because it would contain "ERR" instead of a number, which Perl, of
course, would silently convert to 0!

Python is all about refusing to guess, and complaining if there's an
error. :-)


From pemerson at gmail.com  Fri Mar  5 21:30:47 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 18:30:47 -0800 (PST)
Subject: best practices: is collections.defaultdict my friend or not?
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
	<20100306031003.1018aab2@geekmail.INVALID>
Message-ID: <3ae40c74-7bee-4c6c-9ed2-7a73675f8040@v20g2000prb.googlegroups.com>

On Mar 5, 6:10?pm, Andreas Waldenburger <use... at geekmail.INVALID>
wrote:
> On Fri, 5 Mar 2010 17:22:14 -0800 (PST) Pete Emerson
>
>
>
>
>
> <pemer... at gmail.com> wrote:
> > [snip]
> > >>> data['one'] = {}
> > >>> data['one']['two'] = 'three'
> > >>> print data
> > {'one': {'two': 'three'}}
>
> > And through some research, I discovered collections.defaultdict (new
> > in Python 2.5, FWIW):
>
> > >>> import collections
> > >>> data = collections.defaultdict(dict)
> > >>> data['one']['two'] = 'three'
> > >>> print data
> > defaultdict(<type 'dict'>, {'one': {'two': 'three'}})
>
> > [snip]
> > Your thoughts and comments are very much appreciated. I think my brain
> > already knows some of the answers, but my heart ... well, perl and I
> > go way back. Loving python so far, though.
>
> Oh, by the way: That defaultdict route is a pretty solid solution. Not
> sure what problem you're trying to solve -- depending on your usecase,
> there might be a better approach.
>
> If you're just asking hypothetically and you're trying to apply a
> Perl idiom to Python, there probably *is* a better solution.
>
> /W
>
> --
> INVALID? DE!

I found out about the need to declare the higher level as I was
reading in a JSON struct into a dict and then adding a new entry at a
lower level. Mostly just proof of concept stuff as I'm learning
python. I'm not sure that the use of defaultdict is really warranted
for me anywhere just yet. Mostly, I don't want to convert my perl to
python, that seems very counterproductive. Thank you very much for
your insight.

I was a little frightened of doing "import this" ("Hey, kid, run rm -
rf / and see what happens!"), but did, and the words are wise. :)

Pete


From alfps at start.no  Fri Mar  5 21:32:48 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Sat, 06 Mar 2010 03:32:48 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.209.1267635630.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<mailman.209.1267635630.23598.python-list@python.org>
Message-ID: <hmsesl$57k$1@news.eternal-september.org>

* Robert Kern:
> On 2010-03-03 09:39 AM, Mike Kent wrote:
>> What's the compelling use case for this vs. a simple try/finally?
>>
>>     original_dir = os.getcwd()
>>     try:
>>         os.chdir(somewhere)
>>         # Do other stuff
>>     finally:
>>         os.chdir(original_dir)
>>         # Do other cleanup
> 
> A custom-written context manager looks nicer and can be more readable.
> 
> from contextlib import contextmanager
> import os
> 
> @contextmanager
> def pushd(path):
>     original_dir = os.getcwd()
>     os.chdir(path)
>     try:
>         yield
>     finally:
>         os.chdir(original_dir)
> 
> 
> with pushd(somewhere):
>     ...
> 
> 
> I don't think a general purpose ScopeGuard context manager has any such 
> benefits over the try: finally:, though.

class pushd( Cleanup ):
     def __init__( self, path ):
         original_dir = os.getcwd()
         os.chdir( path )
         self._actions.append( lambda: os.chdir( original_dir ) )


Disclaimer: haven't tested this, but it just occurred to me that for such small 
init/cleanup wrappers the Cleanup class provides a nice alternative to 
@contextmanager, as above: fewer lines, and perhaps even more clear code. :-)


Cheers,

- Alf


From no.email at nospam.invalid  Fri Mar  5 21:53:46 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Fri, 05 Mar 2010 18:53:46 -0800
Subject: best practices: is collections.defaultdict my friend or not?
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
Message-ID: <7xlje6rwhx.fsf@ruckus.brouhaha.com>

Pete Emerson <pemerson at gmail.com> writes:
> I found out that adding a two dimensional element without defining
> first dimension existing doesn't work:
>
>>>> data = {}
>>>> data['one']['two'] = 'three'

You can use a tuple as a subscript if you want:

    data = {}
    data['one','two'] = 'three'


From gherron at islandtraining.com  Fri Mar  5 22:05:20 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Fri, 05 Mar 2010 19:05:20 -0800
Subject: Slicing [N::-1]
In-Reply-To: <83e3ccd0-29d6-4aec-8590-a38e6daba56d@g26g2000yqn.googlegroups.com>
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>	<m2wrxqzlhm.fsf@googlemail.com>	<4b914d35$0$27863$c3e8da3@news.astraweb.com>
	<f2b985f4-f83d-4df4-a7ab-135fc18296c7@q23g2000yqd.googlegroups.com>
	<mailman.386.1267825329.23598.python-list@python.org>	<ca702be2-3307-41a9-85b9-d1cf6a49a049@q16g2000yqq.googlegroups.com>	<mailman.395.1267835669.23598.python-list@python.org>
	<83e3ccd0-29d6-4aec-8590-a38e6daba56d@g26g2000yqn.googlegroups.com>
Message-ID: <4B91C670.3060305@islandtraining.com>

Mensanator wrote:
> On Mar 5, 6:34 pm, Gary Herron <gher... at islandtraining.com> wrote:
>   
>> Mensanator wrote:
>>     
>>> On Mar 5, 3:42 pm, Gary Herron <gher... at islandtraining.com> wrote:
>>>       
>>>> Mensanator wrote:
>>>>         
>>>>> The only way to get a 0 from a reverse range() is to have a bound of
>>>>> -1.
>>>>>           
>>>> Not quite.  An empty second bound goes all the way to the zero index:
>>>>         
>>> Not the same thing. You're using the bounds of the slice index.
>>> I was refering to the bounds of the range() function.
>>>       
>>>>>> for a in range(9,-9,-1):print(a,end=' ')
>>>>>>             
>>> 9 8 7 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 -7 -8
>>>       
>>> To get that to stop at 0, you use a -1 as the bounds:
>>>       
>>>>>> for a in range(9,-1,-1):print(a,end=' ')
>>>>>>             
>>> 9 8 7 6 5 4 3 2 1 0
>>>       
>>> Your slice notation only works if the last (first?) number in
>>> the range happens to be 0. What if the range bounds were variables?
>>> You may still want to force the range's last number to be 0 by
>>> using a constant like range(a,-1,-1) rather than just take
>>> the last number of range(a,b,-1) by using slice notation.
>>>       
>> All true  and valid of course, but I was just contridicting the "the
>> ONLY way to get a 0" (emphasis mine) part of the statement.
>>     
>
> Does it still contradict if you do not use the '::' as the OP
> requested?
>   

Not to my knowledge...  I believe your statement is true in all cases 
which explicitly state the stop value.


>   
>> Gary Herron
>>
>>
>>
>>
>>
>>     
>>>>  >>> range(9)[2::-1]
>>>> [2, 1, 0]
>>>>         
>>>> Gary Herron- Hide quoted text -
>>>>         
>> - Show quoted text -- Hide quoted text -
>>
>> - Show quoted text -
>>     
>
>   



From steve at REMOVE-THIS-cybersource.com.au  Fri Mar  5 23:24:32 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 06 Mar 2010 04:24:32 GMT
Subject: best practices: is collections.defaultdict my friend or not?
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
Message-ID: <4b91d900$0$27863$c3e8da3@news.astraweb.com>

On Fri, 05 Mar 2010 17:22:14 -0800, Pete Emerson wrote:

> Why isn't the behavior of collections.defaultdict the default for a
> dict?

Why would it be?

If you look up a key in a dict:

addressbook['Barney Rubble']

and you don't actually have Barney's address, should Python guess and 
make something up?

In general, looking up a missing key is an error, and errors should never 
pass silently unless explicitly silenced.

And for those cases where missing keys are not errors, you're spoiled for 
choice:

dict.get
dict.setdefault
collections.defaultdict

try:
    dict[key]
except KeyError:
    do something else

Or even:

if key in dict:
    dict[key]
else:
    do something else




-- 
Steven


From pemerson at gmail.com  Sat Mar  6 00:36:39 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 21:36:39 -0800 (PST)
Subject: best practices: is collections.defaultdict my friend or not?
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
	<4b91d900$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <6048eb76-9dca-4509-ad7e-f65040128ebb@b36g2000pri.googlegroups.com>

On Mar 5, 8:24?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Fri, 05 Mar 2010 17:22:14 -0800, Pete Emerson wrote:
> > Why isn't the behavior of collections.defaultdict the default for a
> > dict?
>
> Why would it be?
>
> If you look up a key in a dict:
>
> addressbook['Barney Rubble']
>
> and you don't actually have Barney's address, should Python guess and
> make something up?
>
> In general, looking up a missing key is an error, and errors should never
> pass silently unless explicitly silenced.
>
> And for those cases where missing keys are not errors, you're spoiled for
> choice:
>
> dict.get
> dict.setdefault
> collections.defaultdict
>
> try:
> ? ? dict[key]
> except KeyError:
> ? ? do something else
>
> Or even:
>
> if key in dict:
> ? ? dict[key]
> else:
> ? ? do something else
>
> --
> Steven

My frame of reference for the past 10 < N < 15 years has been doing
this sort of assignment in perl:

$hash{key1}{key2} = value

I definitely agree that looking up a missing key should give an error.
The lazy perl programmer in me just wants to make an assignment to a
missing second key without defining the first key first. I'm not
saying it's right, I'm saying that it's something I'm trying to
unlearn, as I'm being convinced that it's the "best way" to do it in
python.

I'll take a look at dict.get and dict.setdefault, thank you for those.

I'm learning, and you're all very helpful, and I appreciate it!

Pete


From pemerson at gmail.com  Sat Mar  6 00:42:37 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 21:42:37 -0800 (PST)
Subject: best practices: is collections.defaultdict my friend or not?
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
	<mailman.399.1267842408.23598.python-list@python.org>
Message-ID: <c185da34-716b-4df4-af76-c1214df37f2a@q2g2000pre.googlegroups.com>

On Mar 5, 6:26?pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
> Pete Emerson wrote:
> > I've been wrestling with dicts. I hope at the very least what I
> > discovered helps someone else out, but I'm interested in hearing from
> > more learned python users.
>
> > I found out that adding a two dimensional element without defining
> > first dimension existing doesn't work:
>
> >>>> data = {}
> >>>> data['one']['two'] = 'three'
> > Traceback (most recent call last):
> > ? File "<stdin>", line 1, in <module>
> > KeyError: 'one'
> >>>> data['one'] = {}
> >>>> data['one']['two'] = 'three'
> >>>> print data
> > {'one': {'two': 'three'}}
>
> > And through some research, I discovered collections.defaultdict (new
> > in Python 2.5, FWIW):
>
> >>>> import collections
> >>>> data = collections.defaultdict(dict)
> >>>> data['one']['two'] = 'three'
> >>>> print data
> > defaultdict(<type 'dict'>, {'one': {'two': 'three'}})
>
> > Why isn't the behavior of collections.defaultdict the default for a
> > dict?
> > Am I just revelling in my bad perl habits by not wanting to declare a
> > previous level first?
> > Is this sort of "more rigid" way of doing things common throughout
> > python, and is it best that I not fight it, but embrace it?
>
> > Your thoughts and comments are very much appreciated. I think my brain
> > already knows some of the answers, but my heart ... well, perl and I
> > go way back. Loving python so far, though.
>
> Someone once wrote about a case where he was porting a frontend from
> Perl to Python. It called a backend and parsed the result. Sometimes
> converting one of the fields to a number would raise a ValueError
> because it would contain "ERR" instead of a number, which Perl, of
> course, would silently convert to 0!
>
> Python is all about refusing to guess, and complaining if there's an
> error. :-)

Perl is quite an amazing language, but it also definitely allows for
sloppy habits and poor coding behaviors, particularly for someone such
as me whose perl is completely self taught. I think that's why this
time around with python I'm trying to learn my prior experience and
seek help in areas where I suspect there is improvement to be made.
I'm really liking the rigid flexibility I'm experiencing with python
so far.

I'm thinking it's time for me to get a python reference or two, just
to kill a few trees. If anyone has any strong feelings about what
belongs in a "beginner but already learning quickly" library, please
toss them my way. I'll grep around the 'net for opinions on it, too.

Pete


From darcy at druid.net  Sat Mar  6 01:55:48 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Sat, 6 Mar 2010 01:55:48 -0500
Subject: My four-yorkshireprogrammers contribution
In-Reply-To: <7vdo8sFrelU1@mid.individual.net>
References: <20100224212303.242222c6@geekmail.INVALID>
	<eq4l57-okf2.ln1@ozzie.tundraware.com>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <7uu1ooFiipU1@mid.individual.net>
	<4B89D8BE.2040905@mrabarnett.plus.com> <4B8B9845.70604@sequans.com>
	<mailman.59.1267456634.23598.python-list@python.org>
	<7v695nFa0fU1@mid.individual.net>
	<mailman.189.1267627321.23598.python-list@python.org>
	<7v9e3rFl7mU1@mid.individual.net>
	<mailman.294.1267719244.23598.python-list@python.org>
	<7vdo8sFrelU1@mid.individual.net>
Message-ID: <20100306015548.4e510039.darcy@druid.net>

On Sat, 06 Mar 2010 14:19:03 +1300
Gregory Ewing <greg.ewing at canterbury.ac.nz> wrote:
> MRAB wrote:
> > By the standards of just a few years later, that's not so much a
> > microcomputer as a nanocomputer!
> 
> Although not quite as nano as another design published
> in EA a couple of years earlier, the EDUC-8:

Byte Magazine once published plans for building a computer that had one
instruction.  I believe it was a six bit address so that would make it
a max of 64 bytes.  If I recall, the single instruction was "SUBTRACT
AND JUMP ON CARRY."  Now that's nano!

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


From pmaupin at gmail.com  Sat Mar  6 02:21:45 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Fri, 5 Mar 2010 23:21:45 -0800 (PST)
Subject: Initial RSON prototype parser in subversion
References: <mailman.34.1267409372.23598.python-list@python.org>
Message-ID: <bdf3e3d2-43fa-43f9-819a-cf1bcf173c78@15g2000yqi.googlegroups.com>

I have not yet added indentation sensitivity to the parser (although
the tokenizer saves the indentation information for the parser), but
the initial prototype parses all of JSON plus a lot of syntax
enhancements (comments, hex/binary/octal numbers, relaxed quoting
requirements for strings, trailing comments allowed, triple-quoted
strings, etc.)

I have also started the rson-discuss group on google for further
discussions on the actual syntax and initial implementation, if anyone
is interested, and have posted a message there with a bit more
information about the prototype status.

The project page is at http://code.google.com/p/rson/

Best regards,
Pat


From strombrg at gmail.com  Sat Mar  6 03:21:59 2010
From: strombrg at gmail.com (Dan Stromberg)
Date: Sat, 6 Mar 2010 00:21:59 -0800 (PST)
Subject: Fast GUI pipemeter: gprog
References: <619ab895-87a9-4b40-b45e-b12299304b38@z1g2000prc.googlegroups.com>
	<1686070.lZ2vcFHjTE@xkzjympik>
	<c2936c0c-fb6c-4666-a140-977179692e0a@x1g2000prb.googlegroups.com>
Message-ID: <44626216-1aeb-491b-9ee4-c0ed79a7ab88@b9g2000pri.googlegroups.com>

On Mar 4, 4:25?pm, Dan Stromberg <strom... at gmail.com> wrote:

> Python folk: Any guesses why a simple file.read(blocksize) would have
> such an affinity for returning 16K when redirected from /dev/zero? ?If
> I run the program against a file on disk, it gets larger blocksizes
> fine.

Never mind - it was a bug in my code.

Now on a slower machine, it runs about 2.5 times faster than it did on
the faster machine.


From wongjoekmeu at yahoo.com  Sat Mar  6 04:45:46 2010
From: wongjoekmeu at yahoo.com (wongjoekmeu at yahoo.com)
Date: Sat, 6 Mar 2010 01:45:46 -0800 (PST)
Subject: start function in new process
References: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>
	<hmrmn5$d74$1@news.eternal-september.org>
	<86d891a9-b6aa-4de9-a0f5-314867fdf75d@q21g2000yqm.googlegroups.com>
	<hmro0l$lld$1@news.eternal-september.org>
	<3f2cc4f0-b21a-4886-a81c-5b503610ac2d@e7g2000yqf.googlegroups.com>
	<hmrq8j$3n8$1@news.eternal-september.org>
Message-ID: <04188082-bc7f-4b65-bfde-dc7abe5e8123@t41g2000yqt.googlegroups.com>

On 5 mrt, 21:40, "Martin P. Hellwig" <martin.hell... at dcuktec.org>
wrote:
> On 03/05/10 20:09, wongjoek... at yahoo.com wrote:
>
>
>
> > On 5 mrt, 21:02, "Martin P. Hellwig"<martin.hell... at dcuktec.org>
> > wrote:
> >> On 03/05/10 19:45, wongjoek... at yahoo.com wrote:
>
> >>> On 5 mrt, 20:40, "Martin P. Hellwig"<martin.hell... at dcuktec.org>
> >>> wrote:
> >>>> On 03/05/10 19:21, wongjoek... at yahoo.com wrote:
> >>>> <cut os.fork problem>
> >>>> Any specific reason why threading.Thread or multiprocessing is not
> >>>> suitable to solve your problem?
>
> >>>> --
> >>>> mph
>
> >>> Because I got a memory leak in my function f(). It uses scipy, numpy,
> >>> pylab, and I am not planning to solve the memory leak because its too
> >>> complicated. So I thought of just calling the function then when it is
> >>> finished the process is gone and all memory is released. With
> >>> threading I don't think I would solve this problem. I am not sure
> >>> though.
>
> >> I would be surprised if you can't do the same with
> >> subprocess/multiprocessing, since you seem to know how to identify the
> >> memory leak it shouldn't be a problem scripting out a test to see if it
> >> works this way. I would be interested though in your findings.
>
> >> --
> >> mph
>
> > I can't use multiprocessing module since it comes only with python 2.6
> > and I am bound to python2.4. But subprocess does exist in python2.4,
> > but the question now is, how do I achieve that ? Any example ?
>
> Sure, for example if I want to check the openssl version (didn't specify
> I need to provide a useful example :-)
>
> I would normally do on the command line:
> [martin at aspire8930 /usr/home/martin/Desktop]$ /usr/bin/openssl version
> OpenSSL 0.9.8k 25 Mar 2009
>
> The python subprocess equivalent is:
> [martin at aspire8930 /usr/home/martin/Desktop]$ python
> Python 2.6.4 (r264:75706, Jan 31 2010, 20:52:16)
> [GCC 4.2.1 20070719 ?[FreeBSD]] on freebsd8
> Type "help", "copyright", "credits" or "license" for more information.
> ?>>> import subprocess as _sp
> ?>>> ssl_version = _sp.Popen(['/usr/bin/openssl', 'version'],
> stdout=_sp.PIPE)
> ?>>> print(ssl_version.stdout.readlines())
> ['OpenSSL 0.9.8k 25 Mar 2009\n']
> ?>>> quit()
> [martin at aspire8930 /usr/home/martin/Desktop]$
>
> If you get any error in the Popen part, you probably did not use the
> full path or an illegal parameter.
>
> If you get a long wait in the readlines part, this usually means that
> there is either nothing written to stdout or something is still being
> written (I am not sure about this part though, it has been a while).
>
> hth
> --
> mph

Yes, I saw this example also before. HOwever what I want is to call an
internal function which gets a reference of another internal function
as input and not calling an external program. Do you have any example
on that with subprocess module ?
Thanks.


From isso.moh at gmail.com  Sat Mar  6 05:39:09 2010
From: isso.moh at gmail.com (mohamed issolah)
Date: Sat, 6 Mar 2010 11:39:09 +0100
Subject: compiler with python
Message-ID: <d698368f1003060239g1b4393c5v632b07b833a28df@mail.gmail.com>

hey,

How can I construct a compiler with python just for informatiom ., I have
habit to construct it with C language,

sorry for my english ;-)
-- 
issolah mohamed
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From acm at muc.de  Sat Mar  6 06:20:11 2010
From: acm at muc.de (Alan Mackenzie)
Date: Sat, 6 Mar 2010 11:20:11 +0000 (UTC)
Subject: Building Python-2.6.4 on G/L: can't build in _ssl support.
Message-ID: <hmtdpb$d7q$1@colin2.muc.de>

Hi, Python!

I build Python-2.6.4 on my GNU/Linux (Debian Sarge) box.  I get a warning
message "Failed to find the necessary bits to build these modules: ....
_ssl ...  RTFS to find out what!".

I need _ssl for an application.  So, I look at setup.py in the top
directory.  It seems that _ssl needs to find certain .h files, but is
looking in /usr/local/ssl and /usr/contrib (or subdirectories thereof).
These look like highly non-standard directories.

Either something is hugely amiss, or I'm missing some vital nugget of
information (possibly through not being a Python hacker).

Would somebody please give me a tip to get this sorted out?  Thanks!

-- 
Alan Mackenzie (Nuremberg, Germany).



From davea at ieee.org  Sat Mar  6 06:37:12 2010
From: davea at ieee.org (Dave Angel)
Date: Sat, 06 Mar 2010 06:37:12 -0500
Subject: compiler with python
In-Reply-To: <d698368f1003060239g1b4393c5v632b07b833a28df@mail.gmail.com>
References: <d698368f1003060239g1b4393c5v632b07b833a28df@mail.gmail.com>
Message-ID: <4B923E68.1000104@ieee.org>

mohamed issolah wrote:
> hey,
>
> How can I construct a compiler with python just for informatiom ., I have
> habit to construct it with C language,
>
> sorry for my english ;-)
>   
You need to tell us what you're really trying to do, what tools you're 
willing to use, and probably why you want it.  And if you're not sure 
about your English, keep the sentence structure straightforward.

Let me make a couple of wild guesses:

You want to design and build a compiler that takes xml information as 
its source code, and compiles those xml files into Intel x86 machine 
code.  The compiler and the resulting executable needs to run on an x86 
Linux machine.  Your previous experience was in doing this sort of thing 
in C, but you want to try it with Python instead.  You want to do it 
without using the lxml libraries.

You want to build a python compiler, that takes python source code and 
produces Java byte code files.  You'd like to do this in C, but don't 
want to use any of the available existing CPython or Jython source 
code.  Your goal is not to make a commercially viable product, but to 
learn as much as possible in the process.


DaveA


From python at hope.cz  Sat Mar  6 06:53:53 2010
From: python at hope.cz (Johny)
Date: Sat, 6 Mar 2010 03:53:53 -0800 (PST)
Subject: Import problem
Message-ID: <6630f859-b85d-4841-b1d5-2a563dca9cbb@q15g2000yqj.googlegroups.com>

I have this directory structure

C:
      \A
         __init__.py
         amodule.py

         \B
          __init__.py
          bmodule.py

           \D
            __init__.py
            dmodule.py

and  I want to import  bmodule.py
C:\>cd \

C:\>python
Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
(Intel)] on win
32
Type "help", "copyright", "credits" or "license" for more information.
>>> from A.B import  bmodule
I am bmodule
>>>
C:\>

so far so good. Now I would like to import bmodule but if the current
directory is \D subdirectory.

C:> cd \A\B\D
C:\A\B\D>
C:\A\B\D>python
Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
(Intel)] on win
32
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.path.append('C:\\A')
>>> from A.B import bmodule
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named A.B

C:\>

so I can not import a module from the parent directory? Or where did I
make an error?
Thanks for help

L.


From martin.hellwig at dcuktec.org  Sat Mar  6 07:28:25 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Sat, 06 Mar 2010 12:28:25 +0000
Subject: start function in new process
In-Reply-To: <04188082-bc7f-4b65-bfde-dc7abe5e8123@t41g2000yqt.googlegroups.com>
References: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>
	<hmrmn5$d74$1@news.eternal-september.org>
	<86d891a9-b6aa-4de9-a0f5-314867fdf75d@q21g2000yqm.googlegroups.com>
	<hmro0l$lld$1@news.eternal-september.org>
	<3f2cc4f0-b21a-4886-a81c-5b503610ac2d@e7g2000yqf.googlegroups.com>
	<hmrq8j$3n8$1@news.eternal-september.org>
	<04188082-bc7f-4b65-bfde-dc7abe5e8123@t41g2000yqt.googlegroups.com>
Message-ID: <hmthp5$rbo$1@news.eternal-september.org>

On 03/06/10 09:45, wongjoekmeu at yahoo.com wrote:
<cut>
>
> Yes, I saw this example also before. HOwever what I want is to call an
> internal function which gets a reference of another internal function
> as input and not calling an external program. Do you have any example
> on that with subprocess module ?
> Thanks.

Well yes that is possible but you would more or less be just reinventing 
parts of the multiprocessing module, so I would use that one (at the 
location Robert Kern suggested).

-- 
mph


From isso.moh at gmail.com  Sat Mar  6 08:07:30 2010
From: isso.moh at gmail.com (mohamed issolah)
Date: Sat, 6 Mar 2010 14:07:30 +0100
Subject: compiler with python
Message-ID: <d698368f1003060507g13ee8d5ck9c2aff6c0388d49c@mail.gmail.com>

hey,

I want to create a compiler which transform a code like pascal code (that
what I do in C) to "quad"
In C, I use BISON and FLEX tools.
-- 
issolah mohamed
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From kse.listed.co1 at gmail.com  Sat Mar  6 08:33:34 2010
From: kse.listed.co1 at gmail.com (Naeem)
Date: Sat, 6 Mar 2010 05:33:34 -0800 (PST)
Subject: "olivia wilde" "olivia williams" "olivia" "olivia" "olivia" "virgin 
	women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
	"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no 
	clothes" "torrie wilson 2009" "
Message-ID: <a7be4681-06b3-4971-8cc9-cb3b86dfe992@b36g2000pri.googlegroups.com>

"olivia wilde" "olivia williams" "olivia" "olivia" "olivia" "virgin
women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" "


From steve at REMOVE-THIS-cybersource.com.au  Sat Mar  6 09:48:24 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 06 Mar 2010 14:48:24 GMT
Subject: Import problem
References: <6630f859-b85d-4841-b1d5-2a563dca9cbb@q15g2000yqj.googlegroups.com>
Message-ID: <4b926b37$0$27829$c3e8da3@news.astraweb.com>

On Sat, 06 Mar 2010 03:53:53 -0800, Johny wrote:

>>>> import sys
>>>> sys.path.append('C:\\A')
>>>> from A.B import bmodule
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> ImportError: No module named A.B

The current directory is irrelevant, except that it is automatically 
added to the PYTHONPATH. That's why you can import A.B when the current 
directory is C.

You are trying to import module B from package A *inside* directory C:\A, 
but there is no such package A inside C:\A. You need to add C to the 
path, and then it should work.




-- 
Steven


From bdesth.quelquechose at free.quelquepart.fr  Sat Mar  6 10:04:53 2010
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Sat, 06 Mar 2010 16:04:53 +0100
Subject: best practices: is collections.defaultdict my friend or not?
In-Reply-To: <c185da34-716b-4df4-af76-c1214df37f2a@q2g2000pre.googlegroups.com>
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
	<mailman.399.1267842408.23598.python-list@python.org>
	<c185da34-716b-4df4-af76-c1214df37f2a@q2g2000pre.googlegroups.com>
Message-ID: <4b927c8e$0$10093$426a74cc@news.free.fr>

Pete Emerson a ?crit :
(snip)
> I'm really liking the rigid flexibility I'm experiencing with python
> so far.

"rigid flexibility" !-)

+1 QOTW - and welcome on board BTW.


From ijcsorgeditor at gmail.com  Sat Mar  6 10:31:48 2010
From: ijcsorgeditor at gmail.com (editor ijcs)
Date: Sat, 6 Mar 2010 07:31:48 -0800 (PST)
Subject: Call for Paper The International Journal of Computer Science (IJCS)
Message-ID: <50313c59-a5bf-4f12-8c6f-e0c413c68084@k18g2000prf.googlegroups.com>

Call for Paper
The International Journal of Computer Science (IJCS) publishes
original papers on all subjects relevant to computer science,
communication network, and information systems. The highest priority
will be given to those contributions concerned with a discussion of
the background of a practical problem, the establishment of an
appropriate model, the determination of a solution, approximate or
exact, analytical or numerical, and a discussion of the relevance of
the results when applied to the real-life problem. Paper submissions
are invited in the area of computer science, in particular the
technological advances and research results in the fields of
theoretical, experimental, applied electronics, computer science,
communication network and Information technology.
Topics of interest include but are not limited to the following:
     Computer Science

    * Parallel Processing and Distributed Computing
    * Foundations of High-performance Computing
    * Graph Theory and Analysis of Algorithms
    * Artificial Intelligences and Pattern/Image Recognitions
    * Neural Networks and Biomedical Simulations
    * Virtual Visions and Virtual Simulations
    * Data Mining, Web Image Mining and Applications
    * Data Base Management & Information Retrievals Adaptive Systems
    * Bifurcation, Biocybernetics & Bioinformatics
    * Blind Systems, Neural Networks &Control Systems
    * Cryptosystems &Data Compression
    * Evolutional Computation &Fuzzy Systems
    * Image Processing and Image Recognition, Modeling & Optimization
    * Speech Processing, Speech Synthesis & Speech Recognition
    * Video Signal Processing, Watermarking & Wavelet Transform
    * All topics related Computer Science

Communication Network

    * Quantum Computing & Coding
    * Error Controls Agent Computing & Multi-Agents Systems
    * Defining Spectrum Rights and Open Spectrum Solutions
    * Quality of Services and Communication Protocols
    * Satellite and Optical Communication Systems
    * 3G/4G Network Evolutions & CDMA/GSM Communication Protocols
    * Mobile Computing, Transmission/Switching/Distribution
technologies
    * Communication Theory & Signal Processing for Communications
    * Wireless Communications, Wireless & Mobile Networking
    * Optical Networks and Systems &Next-Generation Networking and
Internet
    * Communication QoS &Reliability and Modeling
    * Ad-hoc, Sensor & Mesh Networking
    * Multimedia Services, Communication Software & Services
    * Communication and Information System Security
    * System control and network/service management
    * Network and Internet protocols and standards
    * Client-server, distributed & Web-based communication systems
    * Broadband and multimedia systems & applications
    * Trials of advanced systems and services
    * Any topics related Communication Network

Information and Systems

    * Cryptography and Foundation of Computer Security
    * Authentication/Authorization Issues
    * IDS/Firewall, Anti-Spam mail & Anti-virus issues
    * Biometric authentication & algorithms
    * Fingerprint /Hand/Biometrics Recognitions and Technologies
    * IC-card Security, OTP & Key Management Issues
    * E-commerce, Ubiquitous & RFID Applications
    * Metadata, Meta Modeling, XML & Data Management
    * Knowledge Management, Web Security & Privacy
    * Cyber Threats, Web Services & Web Engineering
    * Web Intelligence, Protocols & Standards
    * Proxies and Servers
    * Multimedia Applications
    * Ontology and the Semantic Web
    * B2B, B2C and C2C
    * E-Business System Design and Development, E-Payment
    * Portal Strategies, Social Networks and Information Systems
    * Social and Legal Issues and Digital Ecology
    * E-Governance, E-Learning and Virtual Classrooms
    * E-Entertainment, E-Journalism
    * Any topics related Information systems

   Electronics

    * Circuits & Devices
    * Communication Networks & Systems
    * Communications & Information Processing
    * Digital Signal Processing & Electrical Engineering
Communications
    * Electromagnetics & Microwaves
    * Instrumentation
    * Measurement & Testing
    * Nanoscience & Nanotechnology
    * Optics & Optoelectronic Effects
    * Devices, Systems &Semiconductors
    * Systems & Control Engineering
    * Telecommunications
    * Any topics related Electronics

International Journal of Computer Science (IJCS)
ISSN: 1884-9083
Website: https://sites.google.com/site/ijcsorg/
Manuscript submission to: ijcsorgeditor at gmail.com

All submitted papers will be judged based on their quality by the
technical committee and reviewers. Papers that describe research and
experimentation are encouraged. All paper submissions will be handled
electronically and detailed instructions on submission procedure are
available on IJCS web pages. Researchers and authors are invited to
participate in the peer-review process of IJCS papers if your research
interest matches with the themes of Call for Papers. For other
information, please contact IJCS Managing Editor.


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Date: Sat, 6 Mar 2010 07:40:19 -0800 (PST)
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From davea at ieee.org  Sat Mar  6 10:56:19 2010
From: davea at ieee.org (Dave Angel)
Date: Sat, 06 Mar 2010 10:56:19 -0500
Subject: compiler with python
In-Reply-To: <d698368f1003060433y2189c120m6f6aa84f2255ba42@mail.gmail.com>
References: <d698368f1003060239g1b4393c5v632b07b833a28df@mail.gmail.com>	
	<4B923E68.1000104@ieee.org>
	<d698368f1003060433y2189c120m6f6aa84f2255ba42@mail.gmail.com>
Message-ID: <4B927B23.2090009@ieee.org>

mohamed issolah wrote:
>
> 2010/3/6 Dave Angel <davea at ieee.org>
>
>   
>> mohamed issolah wrote:
>>
>>     
>>> hey,
>>>
>>> How can I construct a compiler with python just for informatiom ., I have
>>> habit to construct it with C language,
>>>
>>> sorry for my english ;-)
>>>
>>>
>>>       
>> You need to tell us what you're really trying to do, what tools you're
>> willing to use, and probably why you want it.  And if you're not sure about
>> your English, keep the sentence structure straightforward.
>>
>> Let me make a couple of wild guesses:
>>
>>     
>
>
>   
>> You want to design and build a compiler that takes xml information as its
>> source code, and compiles those xml files into Intel x86 machine code.  The
>> compiler and the resulting executable needs to run on an x86 Linux machine.
>>  Your previous experience was in doing this sort of thing in C, but you want
>> to try it with Python instead.  You want to do it without using the lxml
>> libraries.
>>
>> You want to build a python compiler, that takes python source code and
>> produces Java byte code files.  You'd like to do this in C, but don't want
>> to use any of the available existing CPython or Jython source code.  Your
>> goal is not to make a commercially viable product, but to learn as much as
>> possible in the process.
>>
>>
>> DaveA
>>
>>     
>
> hey,
>
> I want to create a compiler which transform a code like pascal code (that
> what I do in C) to "quad"
> In C, I use BISON and FLEX tools.
>
>
>   
I've forwarded your message to the list, and fixed your top-posting by 
moving your response to the bottom.  I don't have a clue what "quad" is, 
unless it's a synonym for Forth.

You haven't specified the OS you'll be using to run the compiler, nor 
the one you're targeting, so some of these choices may not be useful.  
For example, the first one is Linux only.

http://www.freenet.org.nz/python/pybison/
     PyBison - Python binding for Bison/Flex

http://freshmeat.net/projects/yeanpypa/
http://www.slash-me.net/dev/snippets/yeanpypa/documentation.html

http://www.python.org/community/sigs/retired/parser-sig/towards-standard/

Or you could go here, which has links to (most of) these and others.
http://wiki.python.org/moin/LanguageParsing

DaveA







From soniyaa1111 at gmail.com  Sat Mar  6 11:15:22 2010
From: soniyaa1111 at gmail.com (soniyaa 1111)
Date: Sat, 6 Mar 2010 08:15:22 -0800 (PST)
Subject: Shop online without credit card
Message-ID: <b1628c7c-fe25-46d3-bbd0-4137fa021be6@k36g2000prb.googlegroups.com>

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From as at sci.fi  Sat Mar  6 11:24:24 2010
From: as at sci.fi (Anssi Saari)
Date: Sat, 06 Mar 2010 18:24:24 +0200
Subject: Building Python-2.6.4 on G/L: can't build in _ssl support.
References: <hmtdpb$d7q$1@colin2.muc.de>
Message-ID: <vg3fx4dju4n.fsf@pepper.modeemi.cs.tut.fi>

Alan Mackenzie <acm at muc.de> writes:

> Hi, Python!
>
> I build Python-2.6.4 on my GNU/Linux (Debian Sarge) box.  I get a warning
> message "Failed to find the necessary bits to build these modules: ....
> _ssl ...  RTFS to find out what!".

At a guess, you're missing libssl-dev. You might consider installing
python2.6 or python2.6-minimal from unstable or testing too.

> I need _ssl for an application.  So, I look at setup.py in the top
> directory.  It seems that _ssl needs to find certain .h files, but is
> looking in /usr/local/ssl and /usr/contrib (or subdirectories thereof).
> These look like highly non-standard directories.

Looks to me like it looks in those non-standard directories, but in
addition to normal /usr/include.


From peloko45 at gmail.com  Sat Mar  6 13:33:17 2010
From: peloko45 at gmail.com (Joan Miller)
Date: Sat, 6 Mar 2010 10:33:17 -0800 (PST)
Subject: Escape curly bracket together to a variable extension
Message-ID: <09858188-74d3-44be-b66f-1f97bca51500@33g2000yqj.googlegroups.com>

How to escape the first '}' in the next string?

s = "}\n{0}".format('foo')


From alfps at start.no  Sat Mar  6 13:38:23 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Sat, 06 Mar 2010 19:38:23 +0100
Subject: Escape curly bracket together to a variable extension
In-Reply-To: <09858188-74d3-44be-b66f-1f97bca51500@33g2000yqj.googlegroups.com>
References: <09858188-74d3-44be-b66f-1f97bca51500@33g2000yqj.googlegroups.com>
Message-ID: <hmu7f3$9qq$1@news.eternal-september.org>

* Joan Miller:
> How to escape the first '}' in the next string?
> 
> s = "}\n{0}".format('foo')

s = "}}\n{0}".format('foo')


Cheers & hth.,

- Alf


From gherron at islandtraining.com  Sat Mar  6 13:41:44 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Sat, 06 Mar 2010 10:41:44 -0800
Subject: Escape curly bracket together to a variable extension
In-Reply-To: <09858188-74d3-44be-b66f-1f97bca51500@33g2000yqj.googlegroups.com>
References: <09858188-74d3-44be-b66f-1f97bca51500@33g2000yqj.googlegroups.com>
Message-ID: <4B92A1E8.8020407@islandtraining.com>

Joan Miller wrote:
> How to escape the first '}' in the next string?
>
> s = "}\n{0}".format('foo')
>   
 >>> "}}\n{0}".format('foo')
'}\nfoo'


Gary Herron


From helps4indian at gmail.com  Sat Mar  6 15:47:39 2010
From: helps4indian at gmail.com (coolboy8)
Date: Sat, 6 Mar 2010 12:47:39 -0800 (PST)
Subject: Cash for structured settlement
Message-ID: <9a25f256-c9fd-41a2-a0b2-933c42c95d8c@p3g2000pra.googlegroups.com>

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From howe.steven at gmail.com  Sat Mar  6 16:13:19 2010
From: howe.steven at gmail.com (Steven Howe)
Date: Sat, 06 Mar 2010 13:13:19 -0800
Subject: compiler with python
In-Reply-To: <4B927B23.2090009@ieee.org>
References: <d698368f1003060239g1b4393c5v632b07b833a28df@mail.gmail.com>		<4B923E68.1000104@ieee.org>	<d698368f1003060433y2189c120m6f6aa84f2255ba42@mail.gmail.com>
	<4B927B23.2090009@ieee.org>
Message-ID: <4B92C56F.60407@gmail.com>

Is it possible he's talking about a 'quad core'? as in a CPU? In that 
case I think he wants
to optimize a python program for a multiprocessor core with four processors.

sph


On 03/06/2010 07:56 AM, Dave Angel wrote:
> mohamed issolah wrote:
>>
>> 2010/3/6 Dave Angel <davea at ieee.org>
>>
>>> mohamed issolah wrote:
>>>
>>>> hey,
>>>>
>>>> How can I construct a compiler with python just for informatiom ., 
>>>> I have
>>>> habit to construct it with C language,
>>>>
>>>> sorry for my english ;-)
>>>>
>>>>
>>> You need to tell us what you're really trying to do, what tools you're
>>> willing to use, and probably why you want it.  And if you're not 
>>> sure about
>>> your English, keep the sentence structure straightforward.
>>>
>>> Let me make a couple of wild guesses:
>>>
>>
>>
>>> You want to design and build a compiler that takes xml information 
>>> as its
>>> source code, and compiles those xml files into Intel x86 machine 
>>> code.  The
>>> compiler and the resulting executable needs to run on an x86 Linux 
>>> machine.
>>>  Your previous experience was in doing this sort of thing in C, but 
>>> you want
>>> to try it with Python instead.  You want to do it without using the 
>>> lxml
>>> libraries.
>>>
>>> You want to build a python compiler, that takes python source code and
>>> produces Java byte code files.  You'd like to do this in C, but 
>>> don't want
>>> to use any of the available existing CPython or Jython source code.  
>>> Your
>>> goal is not to make a commercially viable product, but to learn as 
>>> much as
>>> possible in the process.
>>>
>>>
>>> DaveA
>>>
>>
>> hey,
>>
>> I want to create a compiler which transform a code like pascal code 
>> (that
>> what I do in C) to "quad"
>> In C, I use BISON and FLEX tools.
>>
>>
> I've forwarded your message to the list, and fixed your top-posting by 
> moving your response to the bottom.  I don't have a clue what "quad" 
> is, unless it's a synonym for Forth.
>
> You haven't specified the OS you'll be using to run the compiler, nor 
> the one you're targeting, so some of these choices may not be useful.  
> For example, the first one is Linux only.
>
> http://www.freenet.org.nz/python/pybison/
>     PyBison - Python binding for Bison/Flex
>
> http://freshmeat.net/projects/yeanpypa/
> http://www.slash-me.net/dev/snippets/yeanpypa/documentation.html
>
> http://www.python.org/community/sigs/retired/parser-sig/towards-standard/
>
> Or you could go here, which has links to (most of) these and others.
> http://wiki.python.org/moin/LanguageParsing
>
> DaveA


From alfps at start.no  Sat Mar  6 16:29:04 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Sat, 06 Mar 2010 22:29:04 +0100
Subject: compiler with python
In-Reply-To: <mailman.411.1267910015.23598.python-list@python.org>
References: <d698368f1003060239g1b4393c5v632b07b833a28df@mail.gmail.com>		<4B923E68.1000104@ieee.org>	<d698368f1003060433y2189c120m6f6aa84f2255ba42@mail.gmail.com>	<4B927B23.2090009@ieee.org>
	<mailman.411.1267910015.23598.python-list@python.org>
Message-ID: <hmuhf4$b73$1@news.eternal-september.org>

Since Mohamed is talking about compilation I think it's more likely he's talking 
about an intermediate program represention based on quad tuples like

   (OP, DESTINATION, ARG1, ARG2)

Cheers,

- Alf


* Steven Howe:
> Is it possible he's talking about a 'quad core'? as in a CPU? In that 
> case I think he wants
> to optimize a python program for a multiprocessor core with four 
> processors.
> 
> sph
> 
> 
> On 03/06/2010 07:56 AM, Dave Angel wrote:
>> mohamed issolah wrote:
>>>
>>> 2010/3/6 Dave Angel <davea at ieee.org>
>>>
>>>> mohamed issolah wrote:
>>>>
>>>>> hey,
>>>>>
>>>>> How can I construct a compiler with python just for informatiom ., 
>>>>> I have
>>>>> habit to construct it with C language,
>>>>>
>>>>> sorry for my english ;-)
>>>>>
>>>>>
>>>> You need to tell us what you're really trying to do, what tools you're
>>>> willing to use, and probably why you want it.  And if you're not 
>>>> sure about
>>>> your English, keep the sentence structure straightforward.
>>>>
>>>> Let me make a couple of wild guesses:
>>>>
>>>
>>>
>>>> You want to design and build a compiler that takes xml information 
>>>> as its
>>>> source code, and compiles those xml files into Intel x86 machine 
>>>> code.  The
>>>> compiler and the resulting executable needs to run on an x86 Linux 
>>>> machine.
>>>>  Your previous experience was in doing this sort of thing in C, but 
>>>> you want
>>>> to try it with Python instead.  You want to do it without using the 
>>>> lxml
>>>> libraries.
>>>>
>>>> You want to build a python compiler, that takes python source code and
>>>> produces Java byte code files.  You'd like to do this in C, but 
>>>> don't want
>>>> to use any of the available existing CPython or Jython source code.  
>>>> Your
>>>> goal is not to make a commercially viable product, but to learn as 
>>>> much as
>>>> possible in the process.
>>>>
>>>>
>>>> DaveA
>>>>
>>>
>>> hey,
>>>
>>> I want to create a compiler which transform a code like pascal code 
>>> (that
>>> what I do in C) to "quad"
>>> In C, I use BISON and FLEX tools.
>>>
>>>
>> I've forwarded your message to the list, and fixed your top-posting by 
>> moving your response to the bottom.  I don't have a clue what "quad" 
>> is, unless it's a synonym for Forth.
>>
>> You haven't specified the OS you'll be using to run the compiler, nor 
>> the one you're targeting, so some of these choices may not be useful.  
>> For example, the first one is Linux only.
>>
>> http://www.freenet.org.nz/python/pybison/
>>     PyBison - Python binding for Bison/Flex
>>
>> http://freshmeat.net/projects/yeanpypa/
>> http://www.slash-me.net/dev/snippets/yeanpypa/documentation.html
>>
>> http://www.python.org/community/sigs/retired/parser-sig/towards-standard/
>>
>> Or you could go here, which has links to (most of) these and others.
>> http://wiki.python.org/moin/LanguageParsing
>>
>> DaveA


From isso.moh at gmail.com  Sat Mar  6 17:00:44 2010
From: isso.moh at gmail.com (mohamed issolah)
Date: Sat, 6 Mar 2010 23:00:44 +0100
Subject: compiler with python
Message-ID: <d698368f1003061400n5df8b70bv627a85e5408191aa@mail.gmail.com>

hey, yes quad = quad tuple like ("+",x1,x2,temp)
I work in linux
example : my parser with flex :


-- 
issolah mohamed
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From benjamin at python.org  Sat Mar  6 17:13:46 2010
From: benjamin at python.org (Benjamin Peterson)
Date: Sat, 6 Mar 2010 16:13:46 -0600
Subject: [RELEASED] Python 3.1.2 release candidate
Message-ID: <1afaf6161003061413k646e972eta515d9322793e208@mail.gmail.com>

On behalf of the Python development team, I'm pleased to announce a release
candidate for the second bugfix release of the Python 3.1 series, Python 3.1.2.

This bug fix release fixes numerous issues found in 3.1.1.  This release
candidate has been released to solicit testing and feedback over an possible
regressions from 3.1.1.  Please consider testing it with your library or
application and reporting an bugs you encounter.  This will help make the final
3.1.2 release, planned in 2 weeks time, all the more stable.

The Python 3.1 version series focuses on the stabilization and optimization of
the features and changes that Python 3.0 introduced.  For example, the new I/O
system has been rewritten in C for speed.  File system APIs that use unicode
strings now handle paths with undecodable bytes in them. Other features include
an ordered dictionary implementation, a condensed syntax for nested with
statements, and support for ttk Tile in Tkinter.  For a more extensive list of
changes in 3.1, see http://doc.python.org/3.1/whatsnew/3.1.html or Misc/NEWS in
the Python distribution.

To download Python 3.1.2rc1 visit:

     http://www.python.org/download/releases/3.1.2/

A list of changes in 3.1.2rc1 can be found here:

     http://svn.python.org/projects/python/tags/r312rc1/Misc/NEWS

The 3.1 documentation can be found at:

     http://docs.python.org/3.1

Bugs can always be reported to:

     http://bugs.python.org


Enjoy!

--
Benjamin Peterson
Release Manager
benjamin at python.org
(on behalf of the entire python-dev team and 3.1.2's contributors)


From vinay_sajip at yahoo.co.uk  Sat Mar  6 17:38:57 2010
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Sat, 6 Mar 2010 14:38:57 -0800 (PST)
Subject: Conditional based on whether or not a module is being used
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
	<50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com> 
	<14a5cd5e1003051225j1d596aa2nfe9eb1047037f19d@mail.gmail.com> 
	<mailman.383.1267823696.23598.python-list@python.org>
	<f4de1c96-502a-42e7-b647-ce52d0f76f2f@u15g2000prd.googlegroups.com>
Message-ID: <29c6a957-5028-4c2d-8594-6c4db8243ef2@d2g2000yqa.googlegroups.com>

On Mar 5, 9:29?pm, Pete Emerson <pemer... at gmail.com> wrote:
>
> I have written my first module called "logger" that logs to syslog via
> the syslog module but also allows forloggingto STDOUT in debug mode
> at multiple levels (to increase verbosity depending on one's need), or
> both. I've looked at theloggingmodule and while it might suit my
> needs, it's overkill for me right now (I'm still *very* much a python
> newbie).
>

Overkill in what sense? You just need to write a few lines of code to
be able to use the logging package which comes with Python:

import logging, logging.handlers, sys
logging.basicConfig(level=logging.DEBUG, stream=sys.stdout)
logging.getLogger().addHandler(logging.handlers.SysLogHandler())
# default logs to syslog at (localhost, 514) with facility LOG_USER
# you can change the default to use e.g. Unix domain sockets and a
different facility

So you're experienced enough and have time enough to write your own
logger module, but too much of a newbie to use a module which is part
of Python's included batteries? If you're writing something like
logging to learn about it and what the issues are, that's fair enough.
But I can't see what you mean by overkill, exactly. The three lines
above (or thereabouts) will, I believe, let you log to syslog and to
stdout...which is what you say you want to do.

> I want to write other modules, and my thinking is that it makes sense
> for those modules to use the "logger" module to do thelogging, if and
> only if the parent using the other modules is also using the logger
> module.
>
> In other words, I don't want to force someone to use the "logger"
> module just so they can use my other modules, even if the "logger"
> module is installed ... but I also want to take advantage of it if I'm
> using it.
>
> Now that I've written that, I'm not sure that makes a whole lot of
> sense. It seems like I could say, "hey, this person has the 'logger'
> module available, let's use it!".
>
> Thoughts?

Well, the logging package is available in Python and ready for use and
pretty much battle tested, so why not use that? Are you planning to
use third-party libraries in your Python work, or write everything
yourself? If you are planning to use third party libraries, how would
their logging be hooked into your logger module? And if not, is it
good to have two logging systems in parallel?

Of course as the maintainer of Python's logging package, you'd expect
me to be biased in favour of it. You maybe shouldn't let that sway
you ;-)

Regards,


Vinay Sajip


From benjamin at python.org  Sat Mar  6 17:41:33 2010
From: benjamin at python.org (Benjamin Peterson)
Date: Sat, 6 Mar 2010 16:41:33 -0600
Subject: [RELEASED] Python 2.7 alpha 4
Message-ID: <1afaf6161003061441j5621bbe7jdb8ba4c22f81f46e@mail.gmail.com>

On behalf of the Python development team, I'm overjoyed to announce the fourth
alpha release of Python 2.7.

Python 2.7 is scheduled (by Guido and Python-dev) to be the last major version
in the 2.x series.  Though more major releases have not been absolutely ruled
out, it's likely that the 2.7 release will an extended period of maintenance for
the 2.x series.

2.7 includes many features that were first released in Python 3.1.  The faster
io module, the new nested with statement syntax, improved float repr, set
literals, dictionary views, and the memoryview object have been backported from
3.1. Other features include an ordered dictionary implementation, unittests
improvements, a new sysconfig module, and support for ttk Tile in Tkinter.  For
a more extensive list of changes in 2.7, see
http://doc.python.org/dev/whatsnew/2.7.html or Misc/NEWS in the Python
distribution.

To download Python 2.7 visit:

     http://www.python.org/download/releases/2.7/

Please note that this is a development release, intended as a preview of new
features for the community, and is thus not suitable for production use.

The 2.7 documentation can be found at:

     http://docs.python.org/2.7

Please consider trying Python 2.7 with your code and reporting any bugs you may
notice to:

     http://bugs.python.org


Enjoy!

--
Benjamin Peterson
2.7 Release Manager
benjamin at python.org
(on behalf of the entire python-dev team and 2.7's contributors)


From rantingrick at gmail.com  Sat Mar  6 17:46:29 2010
From: rantingrick at gmail.com (rantingrick)
Date: Sat, 6 Mar 2010 14:46:29 -0800 (PST)
Subject: Sample code usable Tkinter listbox
References: <hmf1qo$v9v$1@news.eternal-september.org>
	<hmmb3d$fij$1@news.eternal-september.org>
Message-ID: <95cc4ed4-20fa-4198-a354-d6734083c2d7@g11g2000yqe.googlegroups.com>

Opps: found a few errors in that last ScrolledListbox class, try this
one...



import Tkinter as tk
from Tkconstants import *

class ScrolledList(tk.Listbox):
    def __init__(self, master, **kw):
        self.frame = tk.Frame(master)
        self.frame.rowconfigure(0, weight=1)
        self.frame.columnconfigure(0, weight=1)
        self.hbar = tk.Scrollbar(self.frame, orient=HORIZONTAL)
        self.block = tk.Frame(self.frame, width=18, height=18)
        self.block.grid(row=1, column=1)
        self.vbar = tk.Scrollbar(self.frame, orient=VERTICAL)
        kw.setdefault('activestyle', 'none')
        kw.setdefault('highlightthickness', 0)
        kw.setdefault('pack', 0)
        if kw.pop('pack') == 1:
            self.frame.pack(fill=BOTH, expand=1)
        tk.Listbox.__init__(self, self.frame, **kw)
        self.grid(row=0, column=0, sticky=N+S+E+W)
        self.hbar.configure(command=self.xview)
        self.vbar.configure(command=self.yview)
        self.config(
            yscrollcommand=self.vbar.set,
            xscrollcommand=self.hbar.set
            )
        self.hbar.grid(row=1, column=0, sticky=W+E)
        self.vbar.grid(row=0, column=1, sticky=N+S)

        self.pack = lambda **kw: self.frame.pack(**kw)
        self.grid = lambda **kw: self.frame.grid(**kw)
        self.place = lambda **kw: self.frame.place(**kw)
        self.pack_config = lambda **kw: self.frame.pack_config(**kw)
        self.grid_config = lambda **kw: self.frame.grid_config(**kw)
        self.place_config = lambda **kw: self.frame.place_config(**kw)
        self.pack_configure = lambda **kw:
self.frame.pack_config(**kw)
        self.grid_configure = lambda **kw:
self.frame.grid_config(**kw)
        self.place_configure = lambda **kw:
self.frame.place_config(**kw)

    def gets(self):
        return self.get(0, END)

    def sets(self, arg):
        self.delete(0, END)
        try:
            arg = arg.strip('\n').splitlines()
        except AttributeError:
            pass
        if hasattr(arg, '__getitem__'):
            for item in arg:
                self.insert(END, str(item))
        else:
            raise TypeError("Scrolledlist.sets() requires a string or
iterable of strings")


if __name__ == '__main__':
    root = tk.Tk()
    listbox = ScrolledList(root, width=50, height=10, pack=1)
    #listbox.sets(1.25)
    #listbox.sets('1\n2\n3\n4\n5\n\n\n')
    listbox.sets(range(100))
    #listbox.grid(row=0, column=0)
    root.mainloop()


From pemerson at gmail.com  Sat Mar  6 18:13:33 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Sat, 6 Mar 2010 15:13:33 -0800 (PST)
Subject: Conditional based on whether or not a module is being used
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
	<50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com> 
	<14a5cd5e1003051225j1d596aa2nfe9eb1047037f19d@mail.gmail.com> 
	<mailman.383.1267823696.23598.python-list@python.org>
	<f4de1c96-502a-42e7-b647-ce52d0f76f2f@u15g2000prd.googlegroups.com>
	<29c6a957-5028-4c2d-8594-6c4db8243ef2@d2g2000yqa.googlegroups.com>
Message-ID: <9c6a8d26-b71e-4cb8-92d0-49af8728bec4@u15g2000prd.googlegroups.com>

On Mar 6, 2:38?pm, Vinay Sajip <vinay_sa... at yahoo.co.uk> wrote:
> On Mar 5, 9:29?pm, Pete Emerson <pemer... at gmail.com> wrote:
>
>
>
> > I have written my first module called "logger" that logs to syslog via
> > the syslog module but also allows forloggingto STDOUT in debug mode
> > at multiple levels (to increase verbosity depending on one's need), or
> > both. I've looked at theloggingmodule and while it might suit my
> > needs, it's overkill for me right now (I'm still *very* much a python
> > newbie).
>
> Overkill in what sense? You just need to write a few lines of code to
> be able to use the logging package which comes with Python:
>
> import logging, logging.handlers, sys
> logging.basicConfig(level=logging.DEBUG, stream=sys.stdout)
> logging.getLogger().addHandler(logging.handlers.SysLogHandler())
> # default logs to syslog at (localhost, 514) with facility LOG_USER
> # you can change the default to use e.g. Unix domain sockets and a
> different facility
>
> So you're experienced enough and have time enough to write your own
> logger module, but too much of a newbie to use a module which is part
> of Python's included batteries? If you're writing something like
> logging to learn about it and what the issues are, that's fair enough.
> But I can't see what you mean by overkill, exactly. The three lines
> above (or thereabouts) will, I believe, let you log to syslog and to
> stdout...which is what you say you want to do.
>
> > I want to write other modules, and my thinking is that it makes sense
> > for those modules to use the "logger" module to do thelogging, if and
> > only if the parent using the other modules is also using the logger
> > module.
>
> > In other words, I don't want to force someone to use the "logger"
> > module just so they can use my other modules, even if the "logger"
> > module is installed ... but I also want to take advantage of it if I'm
> > using it.
>
> > Now that I've written that, I'm not sure that makes a whole lot of
> > sense. It seems like I could say, "hey, this person has the 'logger'
> > module available, let's use it!".
>
> > Thoughts?
>
> Well, the logging package is available in Python and ready for use and
> pretty much battle tested, so why not use that? Are you planning to
> use third-party libraries in your Python work, or write everything
> yourself? If you are planning to use third party libraries, how would
> their logging be hooked into your logger module? And if not, is it
> good to have two logging systems in parallel?
>
> Of course as the maintainer of Python's logging package, you'd expect
> me to be biased in favour of it. You maybe shouldn't let that sway
> you ;-)
>
> Regards,
>
> Vinay Sajip

Thanks for your insights, Vinay, and thank you also for writing
packages such as logging. The word 'overkill' was a poor choice on my
part! I should have said, "I don't quite understand the logging module
yet, but I am comfortable with the syslog module's two functions,
openlog and syslog".

I wrote my own logger module *partly* to gain the experience, and
partly to do the following:

1) In debug mode, send what would have gone to syslog to STDOUT or
STDERR
2) In non-debug mode, use /dev/log or localhost:514 depending on what
is set
3) Allow for multiple levels of logging beyond INFO, WARNING, CRIT ...
essentially allow multiple levels of INFO depending on how much detail
is desired.  A high level of messaging when programs are running
poorly is desired, but when programs are running smoothly, I don't
need to send as much to syslog.

I started in with your logging package, but I think I simply got ahead
of myself. I definitely agree that writing my own wrappers around
syslog to do what I want might be a duplication of effort. At this
point I think I'm ready to go back to your logging package and see
what I can do; if you have words of advice regarding 1-3 above, I'd
certainly appreciate it.

Now I'll go to your example above and see what it does. Thank you!

Pete


From igouy2 at yahoo.com  Sat Mar  6 18:53:25 2010
From: igouy2 at yahoo.com (Isaac Gouy)
Date: Sat, 6 Mar 2010 15:53:25 -0800 (PST)
Subject: python b.python 8 works on XP but not on Vista?
Message-ID: <e91cc254-0954-4260-8a4a-48e725a6bd87@k6g2000prg.googlegroups.com>

At the command prompt:

   python b.py 8
works fine on both XP and Vista

   python b.python 8
works on XP (and Linux)

but on Vista

   python b.python 8

ImportError: No module named b

?


From news123 at free.fr  Sat Mar  6 18:53:39 2010
From: news123 at free.fr (News123)
Date: Sun, 07 Mar 2010 00:53:39 +0100
Subject: async notification handling w/o threads/polling (similiar to kill
	-hup)?
Message-ID: <4b92eb03$0$22022$426a74cc@news.free.fr>

Hi,

I'd like to notify python processes asynchronously.
at notification time a callback should be called

The solution should be working on linux and Windows.

I could add a wrapper to switch between a windows / linux implementation
though

If possible I'd like to avoid
- having to poll for an external event
- having to add a thread.
- changing my existing code

I thought about using   signal and os.kill()
However windows does not to have SIGHUP , SIGUSR1 or SIGUSR2.
So I'm not sure, which signal I could use with windows.


Apart from that there's one minor problem with signals
which might speak against using signal
All blocking io calls might be interrupted, which is not desirable in my
case.

Do you have any suggestions for
Linux / WIndows or both?


#### example code with signals #################
#### a blocking io call here reading a named pipe
#### would be interrupted
import signal
a = 0
def handler(signum,frame):
    global a
    a += 1

signal.signal(signal.SIGUSR1,handler)
print "hi"
p = open("namedpipe")
while True:
    v = p.read(2)
    print "V:",a,len(v)
    if len(v) != 2: break

print "var a changed, but read() was interrupted :-("


bye


N


From clp2 at rebertia.com  Sat Mar  6 19:02:43 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 6 Mar 2010 16:02:43 -0800
Subject: python b.python 8 works on XP but not on Vista?
In-Reply-To: <e91cc254-0954-4260-8a4a-48e725a6bd87@k6g2000prg.googlegroups.com>
References: <e91cc254-0954-4260-8a4a-48e725a6bd87@k6g2000prg.googlegroups.com>
Message-ID: <50697b2c1003061602y31e26526q878f0c5a9e5573c5@mail.gmail.com>

On Sat, Mar 6, 2010 at 3:53 PM, Isaac Gouy <igouy2 at yahoo.com> wrote:
> At the command prompt:
>
> ? python b.py 8
> works fine on both XP and Vista
>
> ? python b.python 8
> works on XP (and Linux)
>
> but on Vista
>
> ? python b.python 8
>
> ImportError: No module named b
>
> ?

Code please. Also, .python is not a standard extension for Python
files, so why are you using it anyway?

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


From news123 at free.fr  Sat Mar  6 19:17:25 2010
From: news123 at free.fr (News123)
Date: Sun, 07 Mar 2010 01:17:25 +0100
Subject: async notification handling w/o threads/polling (similiar to
	kill -hup)?
In-Reply-To: <4b92eb03$0$22022$426a74cc@news.free.fr>
References: <4b92eb03$0$22022$426a74cc@news.free.fr>
Message-ID: <4b92f095$0$20648$426a74cc@news.free.fr>

News123 wrote:
> Hi,
> 
> I'd like to notify python processes asynchronously.
> at notification time a callback should be called
> 
> The solution should be working on linux and Windows.
> 
> I could add a wrapper to switch between a windows / linux implementation
> though
> 
> If possible I'd like to avoid
> - having to poll for an external event
> - having to add a thread.
Well having a blocking thread would be fine though. what I'd really want
to avoid is any polling.
> - changing my existing code
> 
> I thought about using   signal and os.kill()
> However windows does not to have SIGHUP , SIGUSR1 or SIGUSR2.
> So I'm not sure, which signal I could use with windows.
> 
> 
> Apart from that there's one minor problem with signals
> which might speak against using signal
> All blocking io calls might be interrupted, which is not desirable in my
> case.
> 
> Do you have any suggestions for
> Linux / WIndows or both?
> 
> 
> #### example code with signals #################
> #### a blocking io call here reading a named pipe
> #### would be interrupted
> import signal
> a = 0
> def handler(signum,frame):
>     global a
>     a += 1
> 
> signal.signal(signal.SIGUSR1,handler)
> print "hi"
> p = open("namedpipe")
> while True:
>     v = p.read(2)
>     print "V:",a,len(v)
>     if len(v) != 2: break
> 
> print "var a changed, but read() was interrupted :-("
> 
> 
> bye
> 
> 
> N


From igouy2 at yahoo.com  Sat Mar  6 19:42:42 2010
From: igouy2 at yahoo.com (Isaac Gouy)
Date: Sat, 6 Mar 2010 16:42:42 -0800 (PST)
Subject: python b.python 8 works on XP but not on Vista?
References: <e91cc254-0954-4260-8a4a-48e725a6bd87@k6g2000prg.googlegroups.com>
	<mailman.415.1267920166.23598.python-list@python.org>
Message-ID: <5e6d069d-9116-4a53-914e-594b656c4269@q2g2000pre.googlegroups.com>

On Mar 6, 4:02?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Sat, Mar 6, 2010 at 3:53 PM, Isaac Gouy <igo... at yahoo.com> wrote:
> > At the command prompt:
>
> > ? python b.py 8
> > works fine on both XP and Vista
>
> > ? python b.python 8
> > works on XP (and Linux)
>
> > but on Vista
>
> > ? python b.python 8
>
> > ImportError: No module named b
>
> > ?
>
> Code please.


It's the same code in both cases, I simply renamed "b.python" as
"b.py" as a test.


> Also, .python is not a standard extension for Python
> files, so why are you using it anyway?

Because it's useful for what I'm doing.

Given python 2.6.4 has no problem with a non-standard extension on MS
XP and Linux - why does python 2.6.4 have this problem with a non-
standard extension on MS Vista?




From timr at probo.com  Sat Mar  6 19:49:33 2010
From: timr at probo.com (Tim Roberts)
Date: Sat, 06 Mar 2010 16:49:33 -0800
Subject: indentation error
References: <f1e05b1f-3812-490a-9e6d-4a83aef7fe1d@q2g2000pre.googlegroups.com>
Message-ID: <e0u5p51rcme3igu2882upg7qof8e5l30bm@4ax.com>

asit <lipun4u at gmail.com> wrote:
>
>According to me, indentation is ok. but the python interpreter gives
>an indentation error
>
>[asit ~/py] $ python search.py
>  File "search.py", line 7
>    findResults = string.split(commandOutput, "\n")
>                                                  ^
>IndentationError: unindent does not match any outer indentation level

The most likely cause is mixing spaces with tabs.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From clp2 at rebertia.com  Sat Mar  6 19:53:30 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 6 Mar 2010 16:53:30 -0800
Subject: python b.python 8 works on XP but not on Vista?
In-Reply-To: <5e6d069d-9116-4a53-914e-594b656c4269@q2g2000pre.googlegroups.com>
References: <e91cc254-0954-4260-8a4a-48e725a6bd87@k6g2000prg.googlegroups.com>
	<mailman.415.1267920166.23598.python-list@python.org>
	<5e6d069d-9116-4a53-914e-594b656c4269@q2g2000pre.googlegroups.com>
Message-ID: <50697b2c1003061653g14a3584if8358500149a2715@mail.gmail.com>

On Sat, Mar 6, 2010 at 4:42 PM, Isaac Gouy <igouy2 at yahoo.com> wrote:
> On Mar 6, 4:02?pm, Chris Rebert <c... at rebertia.com> wrote:
>> On Sat, Mar 6, 2010 at 3:53 PM, Isaac Gouy <igo... at yahoo.com> wrote:
>> > At the command prompt:
>>
>> > ? python b.py 8
>> > works fine on both XP and Vista
>>
>> > ? python b.python 8
>> > works on XP (and Linux)
>>
>> > but on Vista
>>
>> > ? python b.python 8
>>
>> > ImportError: No module named b
>>
>> > ?
>>
>> Code please.
>
>
> It's the same code in both cases, I simply renamed "b.python" as
> "b.py" as a test.

The code in b.py matters. I /suspect/ it's importing itself somehow
(probably indirectly), and Python doesn't look for ".python" files
when importing, so it fails with an ImportError. But since you haven't
shown the code, I can only guess.

For that matter, the full exception Traceback would be more helpful
than the code; please include it as well.

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


From igouy2 at yahoo.com  Sat Mar  6 20:23:37 2010
From: igouy2 at yahoo.com (Isaac Gouy)
Date: Sat, 6 Mar 2010 17:23:37 -0800 (PST)
Subject: python b.python 8 works on XP but not on Vista?
References: <e91cc254-0954-4260-8a4a-48e725a6bd87@k6g2000prg.googlegroups.com>
	<mailman.415.1267920166.23598.python-list@python.org>
	<5e6d069d-9116-4a53-914e-594b656c4269@q2g2000pre.googlegroups.com>
	<mailman.416.1267923213.23598.python-list@python.org>
Message-ID: <226a6de2-4626-4a5d-9653-6211284c9ce4@t31g2000prh.googlegroups.com>

On Mar 6, 4:53?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Sat, Mar 6, 2010 at 4:42 PM, Isaac Gouy <igo... at yahoo.com> wrote:
> > On Mar 6, 4:02?pm, Chris Rebert <c... at rebertia.com> wrote:
> >> On Sat, Mar 6, 2010 at 3:53 PM, Isaac Gouy <igo... at yahoo.com> wrote:
> >> > At the command prompt:
>
> >> > ? python b.py 8
> >> > works fine on both XP and Vista
>
> >> > ? python b.python 8
> >> > works on XP (and Linux)
>
> >> > but on Vista
>
> >> > ? python b.python 8
>
> >> > ImportError: No module named b
>
> >> > ?
>
> >> Code please.
>
> > It's the same code in both cases, I simply renamed "b.python" as
> > "b.py" as a test.
>
> The code in b.py matters. I /suspect/ it's importing itself somehow
> (probably indirectly), and Python doesn't look for ".python" files
> when importing, so it fails with an ImportError. But since you haven't
> shown the code, I can only guess.

Yes the code in b.py matters.

Why it matters is that there was another difference between XP and
Vista - the XP machine was single core but the Vista machine was multi
core - and the code behaves differently in each case.

Thanks.



From ssteinerx at gmail.com  Sat Mar  6 21:10:02 2010
From: ssteinerx at gmail.com (ssteinerX@gmail.com)
Date: Sat, 6 Mar 2010 21:10:02 -0500
Subject: python b.python 8 works on XP but not on Vista?
In-Reply-To: <226a6de2-4626-4a5d-9653-6211284c9ce4@t31g2000prh.googlegroups.com>
References: <e91cc254-0954-4260-8a4a-48e725a6bd87@k6g2000prg.googlegroups.com>
	<mailman.415.1267920166.23598.python-list@python.org>
	<5e6d069d-9116-4a53-914e-594b656c4269@q2g2000pre.googlegroups.com>
	<mailman.416.1267923213.23598.python-list@python.org>
	<226a6de2-4626-4a5d-9653-6211284c9ce4@t31g2000prh.googlegroups.com>
Message-ID: <CC4C2ADA-3100-4DAE-8234-028FD9D7116E@gmail.com>


On Mar 6, 2010, at 8:23 PM, Isaac Gouy wrote:

> On Mar 6, 4:53 pm, Chris Rebert <c... at rebertia.com> wrote:
>> On Sat, Mar 6, 2010 at 4:42 PM, Isaac Gouy <igo... at yahoo.com> wrote:
>>> On Mar 6, 4:02 pm, Chris Rebert <c... at rebertia.com> wrote:
>>>> On Sat, Mar 6, 2010 at 3:53 PM, Isaac Gouy <igo... at yahoo.com> wrote:
>>>>> At the command prompt:
>> 
>>>>>   python b.py 8
>>>>> works fine on both XP and Vista
>> 
>>>>>   python b.python 8
>>>>> works on XP (and Linux)
>> 
>>>>> but on Vista
>> 
>>>>>   python b.python 8
>> 
>>>>> ImportError: No module named b
>> 
>>>>> ?
>> 
>>>> Code please.
>> 
>>> It's the same code in both cases, I simply renamed "b.python" as
>>> "b.py" as a test.
>> 
>> The code in b.py matters. I /suspect/ it's importing itself somehow
>> (probably indirectly), and Python doesn't look for ".python" files
>> when importing, so it fails with an ImportError. But since you haven't
>> shown the code, I can only guess.
> 
> Yes the code in b.py matters.
> 
> Why it matters is that there was another difference between XP and
> Vista - the XP machine was single core but the Vista machine was multi
> core - and the code behaves differently in each case.

Yes, and the XP machine's case was blue, therefore case color is important, too.

S



From steve at REMOVE-THIS-cybersource.com.au  Sat Mar  6 21:50:02 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 07 Mar 2010 02:50:02 GMT
Subject: python b.python 8 works on XP but not on Vista?
References: <e91cc254-0954-4260-8a4a-48e725a6bd87@k6g2000prg.googlegroups.com>
	<mailman.415.1267920166.23598.python-list@python.org>
	<5e6d069d-9116-4a53-914e-594b656c4269@q2g2000pre.googlegroups.com>
	<mailman.416.1267923213.23598.python-list@python.org>
	<226a6de2-4626-4a5d-9653-6211284c9ce4@t31g2000prh.googlegroups.com>
	<mailman.420.1267927808.23598.python-list@python.org>
Message-ID: <4b93145a$0$8816$c3e8da3@news.astraweb.com>

On Sat, 06 Mar 2010 21:10:02 -0500, ssteinerX at gmail.com wrote:

> On Mar 6, 2010, at 8:23 PM, Isaac Gouy wrote:
> 
>> On Mar 6, 4:53 pm, Chris Rebert <c... at rebertia.com> wrote:
>>> On Sat, Mar 6, 2010 at 4:42 PM, Isaac Gouy <igo... at yahoo.com> wrote:
>>>> On Mar 6, 4:02 pm, Chris Rebert <c... at rebertia.com> wrote:
>>>>> On Sat, Mar 6, 2010 at 3:53 PM, Isaac Gouy <igo... at yahoo.com> wrote:
>>>>>> At the command prompt:
>>> 
>>>>>>   python b.py 8
>>>>>> works fine on both XP and Vista
>>> 
>>>>>>   python b.python 8
>>>>>> works on XP (and Linux)
>>> 
>>>>>> but on Vista
>>> 
>>>>>>   python b.python 8
>>> 
>>>>>> ImportError: No module named b
>>> 
>>>>>> ?
>>> 
>>>>> Code please.
>>> 
>>>> It's the same code in both cases, I simply renamed "b.python" as
>>>> "b.py" as a test.
>>> 
>>> The code in b.py matters. I /suspect/ it's importing itself somehow
>>> (probably indirectly), and Python doesn't look for ".python" files
>>> when importing, so it fails with an ImportError. But since you haven't
>>> shown the code, I can only guess.
>> 
>> Yes the code in b.py matters.
>> 
>> Why it matters is that there was another difference between XP and
>> Vista - the XP machine was single core but the Vista machine was multi
>> core - and the code behaves differently in each case.
> 
> Yes, and the XP machine's case was blue, therefore case color is
> important, too.


Don't forget that the XP machine was on the left hand side of the desk, 
and the Vista machine on the right. I suspect Isaac needs to physically 
move the Vista machine to the left side, and it will work perfectly.

Either that, or stop pissing around and show us the actual stack trace so 
we can actually help. Isaac, stop *guessing* what the problem is.

If you have to guess, try to make your guesses realistic. It's not likely 
anything to do with the CPU. If anything, Python's search path is 
different on your Vista and XP machines.




-- 
Steven


From igouy2 at yahoo.com  Sat Mar  6 22:04:56 2010
From: igouy2 at yahoo.com (Isaac Gouy)
Date: Sat, 6 Mar 2010 19:04:56 -0800 (PST)
Subject: python b.python 8 works on XP but not on Vista?
References: <e91cc254-0954-4260-8a4a-48e725a6bd87@k6g2000prg.googlegroups.com>
	<mailman.415.1267920166.23598.python-list@python.org>
	<5e6d069d-9116-4a53-914e-594b656c4269@q2g2000pre.googlegroups.com>
	<mailman.416.1267923213.23598.python-list@python.org>
	<226a6de2-4626-4a5d-9653-6211284c9ce4@t31g2000prh.googlegroups.com>
	<mailman.420.1267927808.23598.python-list@python.org>
	<4b93145a$0$8816$c3e8da3@news.astraweb.com>
Message-ID: <fe396e14-298b-4629-9a05-657ab9321714@p3g2000pra.googlegroups.com>

On Mar 6, 6:50?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Sat, 06 Mar 2010 21:10:02 -0500, sstein... at gmail.com wrote:
> > On Mar 6, 2010, at 8:23 PM, Isaac Gouy wrote:
>
> >> On Mar 6, 4:53 pm, Chris Rebert <c... at rebertia.com> wrote:
> >>> On Sat, Mar 6, 2010 at 4:42 PM, Isaac Gouy <igo... at yahoo.com> wrote:
> >>>> On Mar 6, 4:02 pm, Chris Rebert <c... at rebertia.com> wrote:
> >>>>> On Sat, Mar 6, 2010 at 3:53 PM, Isaac Gouy <igo... at yahoo.com> wrote:
> >>>>>> At the command prompt:
>
> >>>>>> ? python b.py 8
> >>>>>> works fine on both XP and Vista
>
> >>>>>> ? python b.python 8
> >>>>>> works on XP (and Linux)
>
> >>>>>> but on Vista
>
> >>>>>> ? python b.python 8
>
> >>>>>> ImportError: No module named b
>
> >>>>>> ?
>
> >>>>> Code please.
>
> >>>> It's the same code in both cases, I simply renamed "b.python" as
> >>>> "b.py" as a test.
>
> >>> The code in b.py matters. I /suspect/ it's importing itself somehow
> >>> (probably indirectly), and Python doesn't look for ".python" files
> >>> when importing, so it fails with an ImportError. But since you haven't
> >>> shown the code, I can only guess.
>
> >> Yes the code in b.py matters.
>
> >> Why it matters is that there was another difference between XP and
> >> Vista - the XP machine was single core but the Vista machine was multi
> >> core - and the code behaves differently in each case.
>
> > Yes, and the XP machine's case was blue, therefore case color is
> > important, too.
>
> Don't forget that the XP machine was on the left hand side of the desk,
> and the Vista machine on the right. I suspect Isaac needs to physically
> move the Vista machine to the left side, and it will work perfectly.
>
> Either that, or stop pissing around and show us the actual stack trace so
> we can actually help. Isaac, stop *guessing* what the problem is.
>
> If you have to guess, try to make your guesses realistic. It's not likely
> anything to do with the CPU. If anything, Python's search path is
> different on your Vista and XP machines.
>
> --
> Steven


That was "Thanks." as in problem solved.

When the code switches on multiprocessing.cpu_count() - single core vs
multicore matters.


From sumerc at gmail.com  Sat Mar  6 22:51:38 2010
From: sumerc at gmail.com (k3xji)
Date: Sat, 6 Mar 2010 19:51:38 -0800 (PST)
Subject: yappi v0.42 released
Message-ID: <4795dfc3-e852-4466-bfe6-c39ef4a900ce@q15g2000yqj.googlegroups.com>

Hi all,

yappi(yet another python profiler with multithreading support)
released.

See:
http://code.google.com/p/yappi/

Thanks,


From steve at REMOVE-THIS-cybersource.com.au  Sat Mar  6 23:23:13 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 07 Mar 2010 04:23:13 GMT
Subject: python b.python 8 works on XP but not on Vista?
References: <e91cc254-0954-4260-8a4a-48e725a6bd87@k6g2000prg.googlegroups.com>
	<mailman.415.1267920166.23598.python-list@python.org>
	<5e6d069d-9116-4a53-914e-594b656c4269@q2g2000pre.googlegroups.com>
	<mailman.416.1267923213.23598.python-list@python.org>
	<226a6de2-4626-4a5d-9653-6211284c9ce4@t31g2000prh.googlegroups.com>
	<mailman.420.1267927808.23598.python-list@python.org>
	<4b93145a$0$8816$c3e8da3@news.astraweb.com>
	<fe396e14-298b-4629-9a05-657ab9321714@p3g2000pra.googlegroups.com>
Message-ID: <4b932a30$0$8816$c3e8da3@news.astraweb.com>

On Sat, 06 Mar 2010 19:04:56 -0800, Isaac Gouy wrote:

> That was "Thanks." as in problem solved.
> 
> When the code switches on multiprocessing.cpu_count() - single core vs
> multicore matters.

I'm glad you solved your problem. Out of curiosity, what was the fault? 
Not the condition that leads to the fault, but the actual fault?

My guess is that it was a difference in sys.path, leading to the b module 
not being found. Am I close?


-- 
Steven


From ping.nsr.yeh at gmail.com  Sun Mar  7 01:53:40 2010
From: ping.nsr.yeh at gmail.com (Ping)
Date: Sat, 6 Mar 2010 22:53:40 -0800 (PST)
Subject: Asynchronous HTTP client
Message-ID: <b212d954-6eb0-43d3-80ac-6cd854a1a560@b36g2000pri.googlegroups.com>

Hi,

I'm trying to find a way to create an asynchronous HTTP client so I
can get responses from web servers in a way like

  async_http_open('http://example.com/', callback_func)
  # immediately continues, and callback_func is called with response
as arg when it is ready

It seems twisted can do it, but I hesitate to bring in such a big
package as a dependency because my client should be light. Asyncore
and asynchat are lighter but they don't speak HTTP. The asynchttp
project on sourceforge is a fusion between asynchat and httplib, but
it hasn't been updated since 2001 and is seriously out of sync with
httplib.

I'd appreciate it if anyone can shed some lights on this.

Thanks,
Ping


From breamoreboy at yahoo.co.uk  Sun Mar  7 04:33:22 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Sun, 07 Mar 2010 09:33:22 +0000
Subject: best practices: is collections.defaultdict my friend or not?
In-Reply-To: <3ae40c74-7bee-4c6c-9ed2-7a73675f8040@v20g2000prb.googlegroups.com>
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>	<20100306031003.1018aab2@geekmail.INVALID>
	<3ae40c74-7bee-4c6c-9ed2-7a73675f8040@v20g2000prb.googlegroups.com>
Message-ID: <hmvrri$drn$1@dough.gmane.org>

Pete Emerson wrote:
> On Mar 5, 6:10 pm, Andreas Waldenburger <use... at geekmail.INVALID>
> wrote:
>> On Fri, 5 Mar 2010 17:22:14 -0800 (PST) Pete Emerson
>>
>>
>>
>>
>>
>> <pemer... at gmail.com> wrote:
>>> [snip]
>>>>>> data['one'] = {}
>>>>>> data['one']['two'] = 'three'
>>>>>> print data
>>> {'one': {'two': 'three'}}
>>> And through some research, I discovered collections.defaultdict (new
>>> in Python 2.5, FWIW):
>>>>>> import collections
>>>>>> data = collections.defaultdict(dict)
>>>>>> data['one']['two'] = 'three'
>>>>>> print data
>>> defaultdict(<type 'dict'>, {'one': {'two': 'three'}})
>>> [snip]
>>> Your thoughts and comments are very much appreciated. I think my brain
>>> already knows some of the answers, but my heart ... well, perl and I
>>> go way back. Loving python so far, though.
>> Oh, by the way: That defaultdict route is a pretty solid solution. Not
>> sure what problem you're trying to solve -- depending on your usecase,
>> there might be a better approach.
>>
>> If you're just asking hypothetically and you're trying to apply a
>> Perl idiom to Python, there probably *is* a better solution.
>>
>> /W
>>
>> --
>> INVALID? DE!
> 
> I found out about the need to declare the higher level as I was
> reading in a JSON struct into a dict and then adding a new entry at a
> lower level. Mostly just proof of concept stuff as I'm learning
> python. I'm not sure that the use of defaultdict is really warranted
> for me anywhere just yet. Mostly, I don't want to convert my perl to
> python, that seems very counterproductive. Thank you very much for
> your insight.
> 
> I was a little frightened of doing "import this" ("Hey, kid, run rm -
> rf / and see what happens!"), but did, and the words are wise. :)
> 
> Pete

After reading the words of wisdom try "import this" a second time and 
watch what happens, it's quite interesting if you're not expecting the 
output.

Mark Lawrence.



From contact at xavierho.com  Sun Mar  7 04:59:00 2010
From: contact at xavierho.com (Xavier Ho)
Date: Sun, 7 Mar 2010 19:59:00 +1000
Subject: Curiosity stirkes me on 'import this'.
Message-ID: <2d56febf1003070159o5346701ema0ba72a43066ace2@mail.gmail.com>

I took a look at the 'this' module to see where the file is stored. This is
probably old news to some people, but was new to me.

print this.s
Gur Mra bs Clguba, ol Gvz Crgref

Ornhgvshy vf orggre guna htyl.
Rkcyvpvg vf orggre guna vzcyvpvg.
Fvzcyr vf orggre guna pbzcyrk.
Pbzcyrk vf orggre guna pbzcyvpngrq.
Syng vf orggre guna arfgrq.
Fcnefr vf orggre guna qrafr.
Ernqnovyvgl pbhagf.
Fcrpvny pnfrf nera'g fcrpvny rabhtu gb oernx gur ehyrf.
Nygubhtu cenpgvpnyvgl orngf chevgl.
Reebef fubhyq arire cnff fvyragyl.
Hayrff rkcyvpvgyl fvyraprq.
Va gur snpr bs nzovthvgl, ershfr gur grzcgngvba gb thrff.
Gurer fubhyq or bar-- naq cersrenoyl bayl bar --boivbhf jnl gb qb vg.
Nygubhtu gung jnl znl abg or boivbhf ng svefg hayrff lbh'er Qhgpu.
Abj vf orggre guna arire.
Nygubhtu arire vf bsgra orggre guna *evtug* abj.
Vs gur vzcyrzragngvba vf uneq gb rkcynva, vg'f n onq vqrn.
Vs gur vzcyrzragngvba vf rnfl gb rkcynva, vg znl or n tbbq vqrn.
Anzrfcnprf ner bar ubaxvat terng vqrn -- yrg'f qb zber bs gubfr!

And some other attributes in 'this' module as well, that decodes the string.
I'm curious. Was this encoded purely for fun? *grins*

Cheers,

Ching-Yun Xavier Ho, Technical Artist

Contact Information
Mobile: (+61) 04 3335 4748
Skype ID: SpaXe85
Email: contact at xavierho.com
Website: http://xavierho.com/
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From peloko45 at gmail.com  Sun Mar  7 05:32:28 2010
From: peloko45 at gmail.com (Joan Miller)
Date: Sun, 7 Mar 2010 02:32:28 -0800 (PST)
Subject: Problem with regular expression
Message-ID: <2dd22712-057a-42a7-9f21-349a56094339@c16g2000yqd.googlegroups.com>

I would to convert the first string to upper case. But this regular
expression is not matching the first string between quotes.

  re.sub("'(?P<id>\w+)': [^{]", "\g<id>FOO", str)

# string to non-matching
'foo': {

# strings to matching
'bar': 'bar2'
'bar': None
'bar': 0
'bar': True

So, i.e., from the first string I would to get:
  'BAR': 'bar2'


Any help? please
Thanks in advance


From steve at holdenweb.com  Sun Mar  7 07:34:41 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 07 Mar 2010 07:34:41 -0500
Subject: Conditional based on whether or not a module is being used
In-Reply-To: <29c6a957-5028-4c2d-8594-6c4db8243ef2@d2g2000yqa.googlegroups.com>
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>	<50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com>
	<14a5cd5e1003051225j1d596aa2nfe9eb1047037f19d@mail.gmail.com>
	<mailman.383.1267823696.23598.python-list@python.org>	<f4de1c96-502a-42e7-b647-ce52d0f76f2f@u15g2000prd.googlegroups.com>
	<29c6a957-5028-4c2d-8594-6c4db8243ef2@d2g2000yqa.googlegroups.com>
Message-ID: <hn06i2$i6q$1@dough.gmane.org>

Vinay Sajip wrote:
[...]
> Well, the logging package is available in Python and ready for use and
> pretty much battle tested, so why not use that? Are you planning to
> use third-party libraries in your Python work, or write everything
> yourself? If you are planning to use third party libraries, how would
> their logging be hooked into your logger module? And if not, is it
> good to have two logging systems in parallel?
> 
> Of course as the maintainer of Python's logging package, you'd expect
> me to be biased in favour of it. You maybe shouldn't let that sway
> you ;-)
> 
Vinay:

My own impression of the logging module, formed from trying to use its
documentation in the past, is that it's somewhat unapproachable, and
difficult to use for simple purposes.

I am happy to say that now I see the current (3.1) documentation it has
improved to the point where I would be happy to try using it again.
Thanks for your long-term maintenance of this package.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From news123 at free.fr  Sun Mar  7 07:52:13 2010
From: news123 at free.fr (News123)
Date: Sun, 07 Mar 2010 13:52:13 +0100
Subject: Problem with regular expression
In-Reply-To: <2dd22712-057a-42a7-9f21-349a56094339@c16g2000yqd.googlegroups.com>
References: <2dd22712-057a-42a7-9f21-349a56094339@c16g2000yqd.googlegroups.com>
Message-ID: <4b93a17d$0$22009$426a74cc@news.free.fr>

Hi Joan,



Joan Miller wrote:
> I would to convert the first string to upper case. But this regular
> expression is not matching the first string between quotes.
> 
>   re.sub("'(?P<id>\w+)': [^{]", "\g<id>FOO", str)
> 
> # string to non-matching
> 'foo': {
> 
> # strings to matching
> 'bar': 'bar2'
> 'bar': None
> 'bar': 0
> 'bar': True
> 
> So, i.e., from the first string I would to get:
>   'BAR': 'bar2'
> 
I'm a little slow today and don't exactly understand your question.

Could you perhaps add some examples of input lines and what you would
like to extract?

example:
input = "first word to Upper"
output = "FIRST word to Upper"


bye


N

> 
> Any help? please
> Thanks in advance


From steve at holdenweb.com  Sun Mar  7 08:03:08 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 07 Mar 2010 08:03:08 -0500
Subject: Problem with regular expression
In-Reply-To: <2dd22712-057a-42a7-9f21-349a56094339@c16g2000yqd.googlegroups.com>
References: <2dd22712-057a-42a7-9f21-349a56094339@c16g2000yqd.googlegroups.com>
Message-ID: <hn087d$sks$1@dough.gmane.org>

Joan Miller wrote:
> I would to convert the first string to upper case. But this regular
> expression is not matching the first string between quotes.
> 
>   re.sub("'(?P<id>\w+)': [^{]", "\g<id>FOO", str)
> 
> # string to non-matching
> 'foo': {
> 
> # strings to matching
> 'bar': 'bar2'
> 'bar': None
> 'bar': 0
> 'bar': True
> 
> So, i.e., from the first string I would to get:
>   'BAR': 'bar2'
> 
> 
> Any help? please
> Thanks in advance

Well your pattern is identifying the right bits, but re.sub() replaces
everything it matches:

>>> import re
>>> strings = """\
... 'bar': 'bar2'
... 'bar': None
... 'bar': 0
... 'bar': True""".split("\n")
>>> for s in strings:
...     print re.sub("'(?P<id>\w+)': [^{]", "\g<id>FOO", s)
...
barFOObar2'
barFOOone
barFOO
barFOOrue
>>>

What you need to fix is the replacement. Take a look at the
documentation for re.sub: you will need to provide a function to apply
the upper-case transformation, and the example there should show you how.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From lie.1296 at gmail.com  Sun Mar  7 08:12:23 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Mon, 08 Mar 2010 00:12:23 +1100
Subject: Asynchronous HTTP client
In-Reply-To: <b212d954-6eb0-43d3-80ac-6cd854a1a560@b36g2000pri.googlegroups.com>
References: <b212d954-6eb0-43d3-80ac-6cd854a1a560@b36g2000pri.googlegroups.com>
Message-ID: <4b93a660$1@dnews.tpgi.com.au>

On 03/07/2010 05:53 PM, Ping wrote:
> Hi,
> 
> I'm trying to find a way to create an asynchronous HTTP client so I
> can get responses from web servers in a way like
> 
>   async_http_open('http://example.com/', callback_func)
>   # immediately continues, and callback_func is called with response
> as arg when it is ready
> 
> It seems twisted can do it, but I hesitate to bring in such a big
> package as a dependency because my client should be light. Asyncore
> and asynchat are lighter but they don't speak HTTP. The asynchttp
> project on sourceforge is a fusion between asynchat and httplib, but
> it hasn't been updated since 2001 and is seriously out of sync with
> httplib.
> 
> I'd appreciate it if anyone can shed some lights on this.

If you want something quite lightweight, you can spawn a thread for the
call:

import threading, urllib
class AsyncOpen(threading.Thread):
    def __init__(self, url, callback):
        super(AsyncOpen, self).__init__()
        self.url = url
        self.callback = callback
    def run(self):
        # of course change urllib to httplib-something-something
        content = urllib.urlopen(self.url).read()
        self.callback(content)

def asyncopen(url, callback):
    AsyncOpen(url, callback).start()

def cb(content):
    print content

asyncopen('http://www.google.com', cb)


From exarkun at twistedmatrix.com  Sun Mar  7 08:16:04 2010
From: exarkun at twistedmatrix.com (exarkun at twistedmatrix.com)
Date: Sun, 07 Mar 2010 13:16:04 -0000
Subject: Asynchronous HTTP client
In-Reply-To: <b212d954-6eb0-43d3-80ac-6cd854a1a560@b36g2000pri.googlegroups.com>
References: <b212d954-6eb0-43d3-80ac-6cd854a1a560@b36g2000pri.googlegroups.com>
Message-ID: <20100307131604.2792.1008062813.divmod.xquotient.1336@localhost.localdomain>

On 06:53 am, ping.nsr.yeh at gmail.com wrote:
>Hi,
>
>I'm trying to find a way to create an asynchronous HTTP client so I
>can get responses from web servers in a way like
>
>  async_http_open('http://example.com/', callback_func)
>  # immediately continues, and callback_func is called with response
>as arg when it is ready
>
>It seems twisted can do it, but I hesitate to bring in such a big
>package as a dependency because my client should be light. Asyncore
>and asynchat are lighter but they don't speak HTTP. The asynchttp
>project on sourceforge is a fusion between asynchat and httplib, but
>it hasn't been updated since 2001 and is seriously out of sync with
>httplib.

Why should it be "light"?  In what way would using Twisted cause 
problems for you?

Jean-Paul


From python.list at tim.thechases.com  Sun Mar  7 08:35:31 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Sun, 07 Mar 2010 07:35:31 -0600
Subject: Problem with regular expression
In-Reply-To: <2dd22712-057a-42a7-9f21-349a56094339@c16g2000yqd.googlegroups.com>
References: <2dd22712-057a-42a7-9f21-349a56094339@c16g2000yqd.googlegroups.com>
Message-ID: <4B93ABA3.7090608@tim.thechases.com>

Joan Miller wrote:
> I would to convert the first string to upper case. But this regular
> expression is not matching the first string between quotes.
> 
>   re.sub("'(?P<id>\w+)': [^{]", "\g<id>FOO", str)

Well, my first thought is that you're not using raw strings, so 
you're not using the regexps and replacements you think you are.

   r"'(?P<id>\w+)': [^{]"

will match the lines of interest.  The replacement will eat the 
opening & closing single-quote, colon, and first character.

> # string to non-matching
> 'foo': {
> 
> # strings to matching
> 'bar': 'bar2'
> 'bar': None
> 'bar': 0
> 'bar': True
> 
> So, i.e., from the first string I would to get:
>   'BAR': 'bar2'

I think you'd have to use a function/lambda to do the 
case-conversion:

   re.sub(
     r"'(?P<id>\w+)(?=': [^{])",
     lambda m: "'" + m.group('id').upper(),
     string_of_interest
     )

Or you could just forgo regexps and use regular string functions 
like split(), startswith(), and upper()

-tkc






From googler.1.webmaster at spamgourmet.com  Sun Mar  7 08:50:59 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Sun, 7 Mar 2010 05:50:59 -0800 (PST)
Subject: time_struct
Message-ID: <23dbe409-60ed-4f6f-bd38-4336e4f1b3d0@f8g2000yqn.googlegroups.com>

Hi,

can anyone tell me how to return a time_struct from the timemodule in
my own C-Module?
Is that possible? I can just find one function in timefuncs.h, but it
doesnt return any PyObject.

Thanks in advance.

moerchendiser2k3


From ptmcg at austin.rr.com  Sun Mar  7 09:10:55 2010
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Sun, 7 Mar 2010 06:10:55 -0800 (PST)
Subject: Problem with regular expression
References: <2dd22712-057a-42a7-9f21-349a56094339@c16g2000yqd.googlegroups.com>
Message-ID: <2694479f-fce9-48ff-9264-fa35fdf103b3@z35g2000yqd.googlegroups.com>

On Mar 7, 4:32?am, Joan Miller <pelok... at gmail.com> wrote:
> I would to convert the first string to upper case. But this regular
> expression is not matching the first string between quotes.
>
Is using pyparsing overkill?  Probably.  But your time is valuable,
and pyparsing let's you knock this out in less time than it probably
took to write your original post.


Use pyparsing's pre-defined expression sglQuotedString to match your
entry key in quotes:

    key = sglQuotedString

Add a parse action to convert to uppercase:

    key.setParseAction(lambda tokens:tokens[0].upper())

Now define the rest of your entry value (be sure to add the negative
lookahead so we *don't* match your foo entry):

    entry = key + ":" + ~Literal("{")

If I put your original test cases into a single string named 'data', I
can now use transformString to convert all of your keys that don't
point to '{'ed values:

    print entry.transformString(data)

Giving me:

    # string to non-matching
    'foo': {

    # strings to matching
    'BAR': 'bar2'
    'BAR': None
    'BAR': 0
    'BAR': True

Here's the whole script:

    from pyparsing import sglQuotedString, Literal

    key = sglQuotedString
    key.setParseAction(lambda tokens:tokens[0].upper())
    entry = key + ":" + ~Literal("{")

    print entry.transformString(data)

And I'll bet that if you come back to this code in 3 months, you'll
still be able to figure out what it does!

-- Paul


From ping.nsr.yeh at gmail.com  Sun Mar  7 09:40:36 2010
From: ping.nsr.yeh at gmail.com (pingooo)
Date: Sun, 7 Mar 2010 22:40:36 +0800
Subject: Asynchronous HTTP client
In-Reply-To: <20100307131604.2792.1008062813.divmod.xquotient.1336@localhost.localdomain>
References: <b212d954-6eb0-43d3-80ac-6cd854a1a560@b36g2000pri.googlegroups.com>
	<20100307131604.2792.1008062813.divmod.xquotient.1336@localhost.localdomain>
Message-ID: <30c3a3701003070640y19772987s50b583aa54e535d5@mail.gmail.com>

2010/3/7 <exarkun at twistedmatrix.com>

> On 06:53 am, ping.nsr.yeh at gmail.com wrote:
>
>> Hi,
>>
>> I'm trying to find a way to create an asynchronous HTTP client so I
>> can get responses from web servers in a way like
>>
>>  async_http_open('http://example.com/', callback_func)
>>  # immediately continues, and callback_func is called with response
>> as arg when it is ready
>>
>> It seems twisted can do it, but I hesitate to bring in such a big
>> package as a dependency because my client should be light. Asyncore
>> and asynchat are lighter but they don't speak HTTP. The asynchttp
>> project on sourceforge is a fusion between asynchat and httplib, but
>> it hasn't been updated since 2001 and is seriously out of sync with
>> httplib.
>>
>
> Why should it be "light"?  In what way would using Twisted cause problems
> for you?
>
> Jean-Paul
>

I'm writing an open source python client for a web service. The client may
be used in all kinds of environments - Linux, Mac OS X, Windows, web
hosting, etc by others. It is not impossible to have twisted as a
dependency, but that makes deployment a larger job than simply uploading a
Python file.

I'm willing to use twisted, but I'd like to explore lighter alternatives
first.

Thanks,
Ping
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From stefan_ml at behnel.de  Sun Mar  7 09:57:02 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sun, 07 Mar 2010 15:57:02 +0100
Subject: compiler with python
In-Reply-To: <d698368f1003060507g13ee8d5ck9c2aff6c0388d49c@mail.gmail.com>
References: <d698368f1003060507g13ee8d5ck9c2aff6c0388d49c@mail.gmail.com>
Message-ID: <hn0eru$fja$2@dough.gmane.org>

mohamed issolah, 06.03.2010 14:07:
> I want to create a compiler which transform a code like pascal code (that
> what I do in C) to "quad"
> In C, I use BISON and FLEX tools.

Hi,

please stop starting new threads for the same topic. Instead, reply to 
responses you get.

Stefan



From exarkun at twistedmatrix.com  Sun Mar  7 09:57:07 2010
From: exarkun at twistedmatrix.com (exarkun at twistedmatrix.com)
Date: Sun, 07 Mar 2010 14:57:07 -0000
Subject: Asynchronous HTTP client
In-Reply-To: <30c3a3701003070640y19772987s50b583aa54e535d5@mail.gmail.com>
References: <b212d954-6eb0-43d3-80ac-6cd854a1a560@b36g2000pri.googlegroups.com>
	<20100307131604.2792.1008062813.divmod.xquotient.1336@localhost.localdomain>
	<30c3a3701003070640y19772987s50b583aa54e535d5@mail.gmail.com>
Message-ID: <20100307145707.2792.1316685222.divmod.xquotient.1369@localhost.localdomain>

On 02:40 pm, ping.nsr.yeh at gmail.com wrote:
>2010/3/7 <exarkun at twistedmatrix.com>
>>On 06:53 am, ping.nsr.yeh at gmail.com wrote:
>>>Hi,
>>>
>>>I'm trying to find a way to create an asynchronous HTTP client so I
>>>can get responses from web servers in a way like
>>>
>>>  async_http_open('http://example.com/', callback_func)
>>>  # immediately continues, and callback_func is called with response
>>>as arg when it is ready
>>>
>>>It seems twisted can do it, but I hesitate to bring in such a big
>>>package as a dependency because my client should be light. Asyncore
>>>and asynchat are lighter but they don't speak HTTP. The asynchttp
>>>project on sourceforge is a fusion between asynchat and httplib, but
>>>it hasn't been updated since 2001 and is seriously out of sync with
>>>httplib.
>>
>>Why should it be "light"?  In what way would using Twisted cause 
>>problems
>>for you?
>>
>>Jean-Paul
>
>I'm writing an open source python client for a web service. The client 
>may
>be used in all kinds of environments - Linux, Mac OS X, Windows, web
>hosting, etc by others. It is not impossible to have twisted as a
>dependency, but that makes deployment a larger job than simply 
>uploading a
>Python file.

Twisted is packaged for many Linux distributions (perhaps most of them). 
Many web hosts provide it.  It's also shipped with OS X.

Windows may be an issue, but note that there's a binary Windows 
installer (as of 10.0, an MSI, so installation can be easily automated).
>I'm willing to use twisted, but I'd like to explore lighter 
>alternatives
>first.

Jean-Paul


From vicente.soler at gmail.com  Sun Mar  7 10:05:26 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sun, 7 Mar 2010 07:05:26 -0800 (PST)
Subject: a simple def how-to
Message-ID: <092afce7-8365-4d52-a08b-e69c07771684@z35g2000yqd.googlegroups.com>

Hello,

My script starts like this:

book=readFromExcelRange('book')
house=readFromExcelRange('house')
table=readFromExcelRange('table')
read=readFromExcelRange('read')
...

But I would like to have something equivalent, like...

ranges=['book','house','table','read']
for i in ranges:
    var[i]=readFromExcelRange(i)

which does not work. I assume I should be using globals() instead of
var, but I do not know how to write my script.

Can anybody help?


From breamoreboy at yahoo.co.uk  Sun Mar  7 10:16:25 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Sun, 07 Mar 2010 15:16:25 +0000
Subject: compiler with python
In-Reply-To: <hmuhf4$b73$1@news.eternal-september.org>
References: <d698368f1003060239g1b4393c5v632b07b833a28df@mail.gmail.com>		<4B923E68.1000104@ieee.org>	<d698368f1003060433y2189c120m6f6aa84f2255ba42@mail.gmail.com>	<4B927B23.2090009@ieee.org>	<mailman.411.1267910015.23598.python-list@python.org>
	<hmuhf4$b73$1@news.eternal-september.org>
Message-ID: <hn0fuq$kch$1@dough.gmane.org>

Alf and Steven Howe, please don't top post, it makes it all but 
impossible to follow a thread.  Darn!:)

Mark Lawrence.

Alf P. Steinbach wrote:
> Since Mohamed is talking about compilation I think it's more likely he's 
> talking about an intermediate program represention based on quad tuples 
> like
> 
>   (OP, DESTINATION, ARG1, ARG2)
> 
> Cheers,
> 
> - Alf
> 
> 
> * Steven Howe:
>> Is it possible he's talking about a 'quad core'? as in a CPU? In that 
>> case I think he wants
>> to optimize a python program for a multiprocessor core with four 
>> processors.
>>
>> sph
>>
>>
>> On 03/06/2010 07:56 AM, Dave Angel wrote:
>>> mohamed issolah wrote:
>>>>
>>>> 2010/3/6 Dave Angel <davea at ieee.org>
>>>>
>>>>> mohamed issolah wrote:
>>>>>
>>>>>> hey,
>>>>>>
>>>>>> How can I construct a compiler with python just for informatiom ., 
>>>>>> I have
>>>>>> habit to construct it with C language,
>>>>>>
>>>>>> sorry for my english ;-)
>>>>>>
>>>>>>
>>>>> You need to tell us what you're really trying to do, what tools you're
>>>>> willing to use, and probably why you want it.  And if you're not 
>>>>> sure about
>>>>> your English, keep the sentence structure straightforward.
>>>>>
>>>>> Let me make a couple of wild guesses:
>>>>>
>>>>
>>>>
>>>>> You want to design and build a compiler that takes xml information 
>>>>> as its
>>>>> source code, and compiles those xml files into Intel x86 machine 
>>>>> code.  The
>>>>> compiler and the resulting executable needs to run on an x86 Linux 
>>>>> machine.
>>>>>  Your previous experience was in doing this sort of thing in C, but 
>>>>> you want
>>>>> to try it with Python instead.  You want to do it without using the 
>>>>> lxml
>>>>> libraries.
>>>>>
>>>>> You want to build a python compiler, that takes python source code and
>>>>> produces Java byte code files.  You'd like to do this in C, but 
>>>>> don't want
>>>>> to use any of the available existing CPython or Jython source 
>>>>> code.  Your
>>>>> goal is not to make a commercially viable product, but to learn as 
>>>>> much as
>>>>> possible in the process.
>>>>>
>>>>>
>>>>> DaveA
>>>>>
>>>>
>>>> hey,
>>>>
>>>> I want to create a compiler which transform a code like pascal code 
>>>> (that
>>>> what I do in C) to "quad"
>>>> In C, I use BISON and FLEX tools.
>>>>
>>>>
>>> I've forwarded your message to the list, and fixed your top-posting 
>>> by moving your response to the bottom.  I don't have a clue what 
>>> "quad" is, unless it's a synonym for Forth.
>>>
>>> You haven't specified the OS you'll be using to run the compiler, nor 
>>> the one you're targeting, so some of these choices may not be 
>>> useful.  For example, the first one is Linux only.
>>>
>>> http://www.freenet.org.nz/python/pybison/
>>>     PyBison - Python binding for Bison/Flex
>>>
>>> http://freshmeat.net/projects/yeanpypa/
>>> http://www.slash-me.net/dev/snippets/yeanpypa/documentation.html
>>>
>>> http://www.python.org/community/sigs/retired/parser-sig/towards-standard/ 
>>>
>>>
>>> Or you could go here, which has links to (most of) these and others.
>>> http://wiki.python.org/moin/LanguageParsing
>>>
>>> DaveA



From jjposner at optimum.net  Sun Mar  7 10:23:35 2010
From: jjposner at optimum.net (John Posner)
Date: Sun, 07 Mar 2010 10:23:35 -0500
Subject: a simple def how-to
In-Reply-To: <092afce7-8365-4d52-a08b-e69c07771684@z35g2000yqd.googlegroups.com>
References: <092afce7-8365-4d52-a08b-e69c07771684@z35g2000yqd.googlegroups.com>
Message-ID: <4b93c4ce$0$31278$607ed4bc@cv.net>

On 3/7/2010 10:05 AM, vsoler wrote:
> Hello,
>
> My script starts like this:
>
> book=readFromExcelRange('book')
> house=readFromExcelRange('house')
> table=readFromExcelRange('table')
> read=readFromExcelRange('read')
> ...
>
> But I would like to have something equivalent, like...
>
> ranges=['book','house','table','read']
> for i in ranges:
>      var[i]=readFromExcelRange(i)
>
> which does not work. I assume I should be using globals() instead of
> var, but I do not know how to write my script.
>
> Can anybody help?

var = []    # create empty list
for i in ranges:
     var.append(readFromExcelRange(i))

  -or-

var = [ readFromExcelRange(i) for i in ranges ]

  -or-

var = map(readFromExcelRange, ranges)

-John


From usenot at geekmail.INVALID  Sun Mar  7 10:23:48 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Sun, 7 Mar 2010 16:23:48 +0100
Subject: a simple def how-to
References: <092afce7-8365-4d52-a08b-e69c07771684@z35g2000yqd.googlegroups.com>
Message-ID: <20100307162348.0995f801@geekmail.INVALID>

On Sun, 7 Mar 2010 07:05:26 -0800 (PST) vsoler
<vicente.soler at gmail.com> wrote:

> Hello,
> 
> My script starts like this:
> 
> book=readFromExcelRange('book')
> house=readFromExcelRange('house')
> table=readFromExcelRange('table')
> read=readFromExcelRange('read')
> ...
> 
> But I would like to have something equivalent, like...
> 
> ranges=['book','house','table','read']
> for i in ranges:
>     var[i]=readFromExcelRange(i)
> 
> which does not work. I assume I should be using globals() instead of
> var, but I do not know how to write my script.
> 
> Can anybody help?

One additional line, and it works (all the following code is untested,
I might have goofed it up somewhere, but you get the idea):

ranges=['book','house','table','read']
var = {}
for i in ranges:
    var[i]=readFromExcelRange(i)

Or, more succinctly:

var = dict((i, readFromExcelRange(i)) for i in ranges)

although that looks a bit crowded. Perhaps

rd = readFromExcelRange
var = dict((i, rd(i)) for i in ranges)

looks better, but not by much, IMO.

In Python 3 you can also just say

var = {i:readFromExcelRange(i) for i in ranges}

(I think. I don't have Python 3.) This looks comparatively neat,
because there are no nesting parens.


And just in case you think it's a good idea to meddle with globals and
create actual "variables": it's not. You absolutely want dictionaries
here. It's basically a bad idea to create names *implicitly* that
you're going to use *explicitly*. (That is, it is in Python anyway,
because it does not provide a clean and clear way of doing this. Other
languages might provide that sort of thing, and it might be awesome,
but in Python, no sir.)

/W

-- 
INVALID? DE!



From vicente.soler at gmail.com  Sun Mar  7 10:57:30 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sun, 7 Mar 2010 07:57:30 -0800 (PST)
Subject: a simple def how-to
References: <092afce7-8365-4d52-a08b-e69c07771684@z35g2000yqd.googlegroups.com>
	<20100307162348.0995f801@geekmail.INVALID>
Message-ID: <9c89873d-15a4-42bc-b30d-572a7111263d@t23g2000yqt.googlegroups.com>

On 7 mar, 16:23, Andreas Waldenburger <use... at geekmail.INVALID> wrote:
> On Sun, 7 Mar 2010 07:05:26 -0800 (PST) vsoler
>
>
>
> <vicente.so... at gmail.com> wrote:
> > Hello,
>
> > My script starts like this:
>
> > book=readFromExcelRange('book')
> > house=readFromExcelRange('house')
> > table=readFromExcelRange('table')
> > read=readFromExcelRange('read')
> > ...
>
> > But I would like to have something equivalent, like...
>
> > ranges=['book','house','table','read']
> > for i in ranges:
> > ? ? var[i]=readFromExcelRange(i)
>
> > which does not work. I assume I should be using globals() instead of
> > var, but I do not know how to write my script.
>
> > Can anybody help?
>
> One additional line, and it works (all the following code is untested,
> I might have goofed it up somewhere, but you get the idea):
>
> ranges=['book','house','table','read']
> var = {}
> for i in ranges:
> ? ? var[i]=readFromExcelRange(i)
>
> Or, more succinctly:
>
> var = dict((i, readFromExcelRange(i)) for i in ranges)
>
> although that looks a bit crowded. Perhaps
>
> rd = readFromExcelRange
> var = dict((i, rd(i)) for i in ranges)
>
> looks better, but not by much, IMO.
>
> In Python 3 you can also just say
>
> var = {i:readFromExcelRange(i) for i in ranges}
>
> (I think. I don't have Python 3.) This looks comparatively neat,
> because there are no nesting parens.
>
> And just in case you think it's a good idea to meddle with globals and
> create actual "variables": it's not. You absolutely want dictionaries
> here. It's basically a bad idea to create names *implicitly* that
> you're going to use *explicitly*. (That is, it is in Python anyway,
> because it does not provide a clean and clear way of doing this. Other
> languages might provide that sort of thing, and it might be awesome,
> but in Python, no sir.)
>
> /W
>
> --
> INVALID? DE!

Thank you Andreas.

Your comprehensive answer makes a lot of sense to me.


From vicente.soler at gmail.com  Sun Mar  7 10:59:30 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sun, 7 Mar 2010 07:59:30 -0800 (PST)
Subject: a simple def how-to
References: <092afce7-8365-4d52-a08b-e69c07771684@z35g2000yqd.googlegroups.com>
	<4b93c4ce$0$31278$607ed4bc@cv.net>
Message-ID: <63b9d9e5-cd46-4e96-b8e5-e791ad6e9a1e@i25g2000yqm.googlegroups.com>

On 7 mar, 16:23, John Posner <jjpos... at optimum.net> wrote:
> On 3/7/2010 10:05 AM, vsoler wrote:
>
>
>
> > Hello,
>
> > My script starts like this:
>
> > book=readFromExcelRange('book')
> > house=readFromExcelRange('house')
> > table=readFromExcelRange('table')
> > read=readFromExcelRange('read')
> > ...
>
> > But I would like to have something equivalent, like...
>
> > ranges=['book','house','table','read']
> > for i in ranges:
> > ? ? ?var[i]=readFromExcelRange(i)
>
> > which does not work. I assume I should be using globals() instead of
> > var, but I do not know how to write my script.
>
> > Can anybody help?
>
> var = [] ? ?# create empty list
> for i in ranges:
> ? ? ?var.append(readFromExcelRange(i))
>
> ? -or-
>
> var = [ readFromExcelRange(i) for i in ranges ]
>
> ? -or-
>
> var = map(readFromExcelRange, ranges)
>
> -John

John,

Thank you for your help. Perhaps the solution you are suggesting is
not exactly what I was looking for, but helped anyway.


From jjposner at optimum.net  Sun Mar  7 11:16:36 2010
From: jjposner at optimum.net (John Posner)
Date: Sun, 07 Mar 2010 11:16:36 -0500
Subject: a simple def how-to
In-Reply-To: <63b9d9e5-cd46-4e96-b8e5-e791ad6e9a1e@i25g2000yqm.googlegroups.com>
References: <092afce7-8365-4d52-a08b-e69c07771684@z35g2000yqd.googlegroups.com>
	<4b93c4ce$0$31278$607ed4bc@cv.net>
	<63b9d9e5-cd46-4e96-b8e5-e791ad6e9a1e@i25g2000yqm.googlegroups.com>
Message-ID: <4B93D164.3060309@optimum.net>

On 3/7/2010 10:59 AM, vsoler wrote:
>
> Thank you for your help. Perhaps the solution you are suggesting is
> not exactly what I was looking for, but helped anyway.

Oops, I was thinking list, not dict. Too fast, and not enough coffee!

-John




From vicente.soler at gmail.com  Sun Mar  7 11:23:13 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sun, 7 Mar 2010 08:23:13 -0800 (PST)
Subject: Duplicate keys in dict?
Message-ID: <21f87f60-fea2-417a-a092-64363b5b280e@y11g2000yqh.googlegroups.com>

Hello,

My code snippet reads data from excel ranges. First row and first
column are column headers and row headers respectively. After reding
the range I build a dict.

................'A'..............'B'
'ab'............3................5
'cd'............7................2
'cd'............9................1
'ac'............7................2

d={('ab','A'): 3, ('ab','B'): 5, ('cd','A'): 7, ...

However, as you can see there are two rows that start with 'cd', and
dicts, AFAIK do not accept duplicates.

What is the best workaround for this? Should I discard dicts? Should I
somehow have under 'cd'... a list of values?

One of the difficulties I find here is that I want to be able to
easily sum all the values for each row key:  'ab', 'cd' and 'ac'.
However, using lists inside dicts makes it a difficult issue for me.

What is the best approach for this problem? Can anybody help?


From steve at REMOVE-THIS-cybersource.com.au  Sun Mar  7 11:42:59 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 07 Mar 2010 16:42:59 GMT
Subject: a simple def how-to
References: <092afce7-8365-4d52-a08b-e69c07771684@z35g2000yqd.googlegroups.com>
Message-ID: <4b93d793$0$8836$c3e8da3@news.astraweb.com>

On Sun, 07 Mar 2010 07:05:26 -0800, vsoler wrote:

> Hello,
> 
> My script starts like this:
> 
> book=readFromExcelRange('book')
> house=readFromExcelRange('house')
> table=readFromExcelRange('table')
> read=readFromExcelRange('read')
> ...
> 
> But I would like to have something equivalent, like...
> 
> ranges=['book','house','table','read'] 
> for i in ranges:
>     var[i]=readFromExcelRange(i)
> 
> which does not work. I assume I should be using globals() instead of
> var, but I do not know how to write my script.
> 
> Can anybody help?

Yes. Use a dict instead.

ranges=['book','house','table','read']
data = {}
for name in ranges:
    data[name] = readFromExcelRange(name)

# and later...

item = 'table'
print "The range '%s' is %s" % (item, data[item])



-- 
Steven


From news123 at free.fr  Sun Mar  7 11:46:02 2010
From: news123 at free.fr (News123)
Date: Sun, 07 Mar 2010 17:46:02 +0100
Subject: Duplicate keys in dict?
In-Reply-To: <21f87f60-fea2-417a-a092-64363b5b280e@y11g2000yqh.googlegroups.com>
References: <21f87f60-fea2-417a-a092-64363b5b280e@y11g2000yqh.googlegroups.com>
Message-ID: <4b93d84b$0$10084$426a74cc@news.free.fr>

vsoler wrote:
> Hello,
> 
> My code snippet reads data from excel ranges. First row and first
> column are column headers and row headers respectively. After reding
> the range I build a dict.
> 
> ................'A'..............'B'
> 'ab'............3................5
> 'cd'............7................2
> 'cd'............9................1
> 'ac'............7................2
> 
> d={('ab','A'): 3, ('ab','B'): 5, ('cd','A'): 7, ...
> 
> However, as you can see there are two rows that start with 'cd', and
> dicts, AFAIK do not accept duplicates.

Normall dicts are used if you want to access your data at a later point
in time by the key name.

Do you want to be able to do this?


Then what would you expect to receive for d[('cd','A')] ?

The first value? the second value? both values?

Could you perhaps change further occurences of 'cd' with 'cd1' , 'cd2' ,
'cd3',  ... ?

Not knowing your exact context makes it difficult to suggest solutions?

perhaps you could switch to a list containing a tuple of (rowname,rowdict)


l = [ ('ab', { 'A': 3 , 'B': 5 } ),
       'cd', { 'A': 7 , 'B': 2 } ),
       'cd', { 'A': 9 , 'B': 1 } ),
       'ac', { ... }
    ]


bye

N

> 
> What is the best workaround for this? Should I discard dicts? Should I
> somehow have under 'cd'... a list of values?
> 
> One of the difficulties I find here is that I want to be able to
> easily sum all the values for each row key:  'ab', 'cd' and 'ac'.
> However, using lists inside dicts makes it a difficult issue for me.
> 
> What is the best approach for this problem? Can anybody help?


From steve at REMOVE-THIS-cybersource.com.au  Sun Mar  7 11:53:55 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 07 Mar 2010 16:53:55 GMT
Subject: Duplicate keys in dict?
References: <21f87f60-fea2-417a-a092-64363b5b280e@y11g2000yqh.googlegroups.com>
Message-ID: <4b93da23$0$8836$c3e8da3@news.astraweb.com>

On Sun, 07 Mar 2010 08:23:13 -0800, vsoler wrote:

> Hello,
> 
> My code snippet reads data from excel ranges. First row and first column
> are column headers and row headers respectively. After reding the range
> I build a dict.
> 
> ................'A'..............'B'
> 'ab'............3................5
> 'cd'............7................2
> 'cd'............9................1
> 'ac'............7................2
> 
> d={('ab','A'): 3, ('ab','B'): 5, ('cd','A'): 7, ...
> 
> However, as you can see there are two rows that start with 'cd', and
> dicts, AFAIK do not accept duplicates.

> One of the difficulties I find here is that I want to be able to easily
> sum all the values for each row key:  'ab', 'cd' and 'ac'. However,
> using lists inside dicts makes it a difficult issue for me.

Given the sample above, what answer do you expect for summing the 'cd' 
row? There are four reasonable answers:

7 + 2 = 9
9 + 1 = 10
7 + 2 + 9 + 1 = 19
Error

You need to decide what you want to do before asking how to do it.



-- 
Steven


From vicente.soler at gmail.com  Sun Mar  7 12:13:13 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sun, 7 Mar 2010 09:13:13 -0800 (PST)
Subject: Duplicate keys in dict?
References: <21f87f60-fea2-417a-a092-64363b5b280e@y11g2000yqh.googlegroups.com>
	<4b93da23$0$8836$c3e8da3@news.astraweb.com>
Message-ID: <70b3224d-a8d1-4182-8609-0b96270fa13e@33g2000yqj.googlegroups.com>

On 7 mar, 17:53, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Sun, 07 Mar 2010 08:23:13 -0800, vsoler wrote:
> > Hello,
>
> > My code snippet reads data from excel ranges. First row and first column
> > are column headers and row headers respectively. After reding the range
> > I build a dict.
>
> > ................'A'..............'B'
> > 'ab'............3................5
> > 'cd'............7................2
> > 'cd'............9................1
> > 'ac'............7................2
>
> > d={('ab','A'): 3, ('ab','B'): 5, ('cd','A'): 7, ...
>
> > However, as you can see there are two rows that start with 'cd', and
> > dicts, AFAIK do not accept duplicates.
> > One of the difficulties I find here is that I want to be able to easily
> > sum all the values for each row key: ?'ab', 'cd' and 'ac'. However,
> > using lists inside dicts makes it a difficult issue for me.
>
> Given the sample above, what answer do you expect for summing the 'cd'
> row? There are four reasonable answers:
>
> 7 + 2 = 9
> 9 + 1 = 10
> 7 + 2 + 9 + 1 = 19
> Error
>
> You need to decide what you want to do before asking how to do it.
>
> --
> Steven

Steven,

What I need is that sum(('cd','A')) gives me 16, sum(('cd','B')) gives
me 3.

I apologize for not having made it clear.


From rjngrj2010 at gmail.com  Sun Mar  7 12:16:04 2010
From: rjngrj2010 at gmail.com (gujax)
Date: Sun, 7 Mar 2010 09:16:04 -0800 (PST)
Subject: importerror: module Gnuplot missing
Message-ID: <e4c0f9ce-fa54-4ec4-9870-b75264424b33@15g2000yqi.googlegroups.com>

Hi,
I need help. I am trying to follow examples from a book "Python
Scripting for Computational Science" and the examples are all plotted
using Gnuplot. When I run the programs I get error saying "importerror
Gnuplot module missing".

I have installed Gnuplot in C:\My Programs\gnuplot directory (running
on WinME). I have installed python 2.5 and Gnuplot 4.2. I have also
installed Gnuplot-py-1.8 in Python's site-packages.

All paths are correctly set as I can see from sys.path argument i.e.,
path for gnuplot is set and so also the python path and scripting path
which is where book examples reside. Many examples did run well until
it came down to plotting...

I also ran 'python test.py' from Gnuplot-py-1.8 directory and
strangely it runs and then asks me to press return to see result. The
screen then freezes and the computer hangs. I have to reboot it again.
Some one suggested in the old archives that I should change in the
utils the code

import Gnuplot,utils to
import utils
from _Gnuplot import Gnuplot

I have tried it but same result. Window freezes and my "C:\Windows\ "
directory gets filled with fff #...tmp files. I have no idea what are
those.

My other attempts:
1. Is there an issue how one names the directory - gnuplot versus
Gnuplot etc...
2. I have done things like >>> from numpy import oldnumeric. And the
test runs fine.
3. "python setup.py" install for installing Gnuplot-py-1.8 also ran
fine.
4. I could from "\gnuplot\bin" directory open wgnuplot and in the
Gnuplot window could plot sinx/x.
5. I also have a pgnuplot application
6. Is the gnuplot version incompatible with Python 2.5 and its
associated older numpy versions..

I have seen several similar "missing Gnuplot" reports in the archive
but did not find any resolution to those. I will appreciate any help,
Thanks
gujax



From stefan_ml at behnel.de  Sun Mar  7 12:17:01 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sun, 07 Mar 2010 18:17:01 +0100
Subject: a simple def how-to
In-Reply-To: <092afce7-8365-4d52-a08b-e69c07771684@z35g2000yqd.googlegroups.com>
References: <092afce7-8365-4d52-a08b-e69c07771684@z35g2000yqd.googlegroups.com>
Message-ID: <hn0n2d$aro$1@dough.gmane.org>

vsoler, 07.03.2010 16:05:
> Hello,
>
> My script starts like this:
>
> book=readFromExcelRange('book')
> house=readFromExcelRange('house')
> table=readFromExcelRange('table')
> read=readFromExcelRange('read')
> ...
>
> But I would like to have something equivalent, like...
>
> ranges=['book','house','table','read']
> for i in ranges:
>      var[i]=readFromExcelRange(i)

Note that the name "i" is rather badly chosen as it generally implies a 
totally different thing (integer) than what you use it for (names of ranges).

"ranges" seems to fall into the same bucket, but I guess that's just 
because I can't extract the meaning from your code snippet (which is not a 
good sign).

Try to use expressive names in your code, so that people who look at it for 
the first time get an idea about what it does with what kind of data.

Stefan



From karun.madhan at gmail.com  Sun Mar  7 13:09:47 2010
From: karun.madhan at gmail.com (madhan)
Date: Sun, 7 Mar 2010 10:09:47 -0800 (PST)
Subject: click me
Message-ID: <b9cb1d94-d6bf-4ed9-b06a-0089d6135ad9@b36g2000pri.googlegroups.com>

please clic it it will be usefull to you

 http://123maza.com/78/healthyfitness/


From miraclesoul at hotmail.com  Sun Mar  7 13:55:24 2010
From: miraclesoul at hotmail.com (Fahad Ahmad)
Date: Sun, 7 Mar 2010 18:55:24 +0000
Subject: Calculating very large exponents in python
Message-ID: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>


Dear All,

i am writing my crytographic scheme in python, i am just a new user to it. 
I have written the complete code, the only point i am stuck it is that i am using 256 exponentiation which is normal in crytography but python just hangs on it.

g**x  [where both g and x are 256 bit numbers , in decimal they are around 77]

after reading several forums, i just come to know it can be done using numpy, i have installed python(x,y) has has both numpy and scipy installed but i am not able to make it happen.

any idea which library, module, or piece of code can solve this mystery :S

sorry for bad english

"People
come and go no one remembers them for life but it is the time spent
with them that become Sweet memories that are remembered for life 
hope I leave some memories behind " 

 		 	   		  
_________________________________________________________________
Your E-mail and More On-the-Go. Get Windows Live Hotmail Free.
http://clk.atdmt.com/GBL/go/201469229/direct/01/
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From python.list at tim.thechases.com  Sun Mar  7 14:11:18 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Sun, 07 Mar 2010 13:11:18 -0600
Subject: Duplicate keys in dict?
In-Reply-To: <70b3224d-a8d1-4182-8609-0b96270fa13e@33g2000yqj.googlegroups.com>
References: <21f87f60-fea2-417a-a092-64363b5b280e@y11g2000yqh.googlegroups.com>	<4b93da23$0$8836$c3e8da3@news.astraweb.com>
	<70b3224d-a8d1-4182-8609-0b96270fa13e@33g2000yqj.googlegroups.com>
Message-ID: <4B93FA56.20100@tim.thechases.com>

vsoler wrote:
> On 7 mar, 17:53, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
>> On Sun, 07 Mar 2010 08:23:13 -0800, vsoler wrote:
>>> Hello,
>>> My code snippet reads data from excel ranges. First row and first column
>>> are column headers and row headers respectively. After reding the range
>>> I build a dict.
>>> ................'A'..............'B'
>>> 'ab'............3................5
>>> 'cd'............7................2
>>> 'cd'............9................1
>>> 'ac'............7................2
>>> d={('ab','A'): 3, ('ab','B'): 5, ('cd','A'): 7, ...
>>> However, as you can see there are two rows that start with 'cd', and
>>> dicts, AFAIK do not accept duplicates.
>>> One of the difficulties I find here is that I want to be able to easily
>>> sum all the values for each row key:  'ab', 'cd' and 'ac'. However,
>>> using lists inside dicts makes it a difficult issue for me.
> 
> What I need is that sum(('cd','A')) gives me 16, sum(('cd','B')) gives
> me 3.

But you really *do* want lists inside the dict if you want to be 
able to call sum() on them.  You want to map the tuple ('cd','A') 
to the list [7,9] so you can sum the results.  And if you plan to 
sum the results, it's far easier to have one-element lists and 
just sum them, instead of having to special case "if it's a list, 
sum it, otherwise, return the value".  So I'd use something like

   import csv
   f = file(INFILE, 'rb')
   r = csv.reader(f, ...)
   headers = r.next() # discard the headers
   d = defaultdict(list)
   for (label, a, b) in r:
     d[(label, 'a')].append(int(a))
     d[(label, 'b')].append(int(b))
   # ...
   for (label, col), value in d.iteritems():
     print label, col, 'sum =', sum(value)

Alternatively, if you don't need to store the intermediate 
values, and just want to store the sums, you can accrue them as 
you go along:

   d = defaultdict(int)
   for (label, a, b) in r:
     d[(label, 'a')] += int(a)
     d[(label, 'b')] += int(b)
   # ...
   for (label, col), value in d.iteritems():
     print label, col, 'sum =', value

Both are untested, but I'm pretty sure they're both viable, 
modulo my sleep-deprived eyes.

-tkc






From python at rgbaz.eu  Sun Mar  7 14:26:57 2010
From: python at rgbaz.eu (PythonAB)
Date: Sun, 7 Mar 2010 20:26:57 +0100
Subject: Bluetooth
Message-ID: <BD5B58B2-7774-4F42-90BC-5D0AF8CC82F7@rgbaz.eu>

Hello,


I'm writing a script that has to connect a bluetooth device
with a 3D application.
On my search for a bluetooth module i ran into this:
http://www.python.org/download/releases/2.4/notes/
where it says:
"The socket module now supports Bluetooth sockets,
if the system has <bluetooth/bluetooth.h>"

Yet I can't find anything at all in the socket manuals
nor anywhere else on the site...

Does the socket module really support Bluetooth out of the box?
I've used socket before but never read anything about bluetooth...

Maybe I need to get the bluetooth.h file, but i have no idea what I
am supposed to do with it...

Can anyone shed some light on this for me please?

thanks in advance,

gr
Arno
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From debatem1 at gmail.com  Sun Mar  7 15:40:59 2010
From: debatem1 at gmail.com (geremy condra)
Date: Sun, 7 Mar 2010 15:40:59 -0500
Subject: Calculating very large exponents in python
In-Reply-To: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>
References: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>
Message-ID: <f3cc57c61003071240x18b580bend946824ef7955b6c@mail.gmail.com>

On Sun, Mar 7, 2010 at 1:55 PM, Fahad Ahmad <miraclesoul at hotmail.com> wrote:
> Dear All,
>
> i am writing my crytographic scheme in python, i am just a new user to it.
> I have written the complete code, the only point i am stuck it is that i am
> using 256 exponentiation which is normal in crytography but python just
> hangs on it.
>
> g**x? [where both g and x are 256 bit numbers , in decimal they are around
> 77]
>
> after reading several forums, i just come to know it can be done using
> numpy, i have installed python(x,y) has has both numpy and scipy installed
> but i am not able to make it happen.
>
> any idea which library, module, or piece of code can solve this mystery :S
>
> sorry for bad english

A couple of things:

1) if you're working with modular exponentiation, remember that pow() takes
three arguments, ie:

a = 222222222222222222222222222
b = 5555555555555555555555555555
pow(a, b, 1200)

will calculate the correct answer (768) very quickly, while

a**b % 1200

has not terminated in the time it took me to compose this
email.

2) sage has a lot of excellent tools for crypto/cryptanalysis that you
may want to take a look at.

3) not saying you don't know what you're doing, but be careful when
rolling your own cryptosystems- even very good cryptographers make
implementation mistakes!

Geremy Condra


From vlastimil.brom at gmail.com  Sun Mar  7 16:04:42 2010
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Sun, 7 Mar 2010 22:04:42 +0100
Subject: negative "counts" in collections.Counter?
Message-ID: <9fdb569a1003071304x7265b331o58dc407c2a51307d@mail.gmail.com>

Hi all,
I'd like to ask about the possibility of negative "counts" in
collections.Counter (using Python 3.1);
I believe, my usecase is rather trivial, basically I have the word
frequencies of two texts and I want do compare them (e.g. to see what
was added and removed between different versions of a text).

This is simple enough to do with own code, but I thought, this would
be exactly the case for Counter...
However, as the Counter only returns positive counts, one has to get
the difference in both directions and combine them afterwards, maybe
something like:

>>> c1=collections.Counter("aabcddd")
>>> c2=collections.Counter("abbbd")
>>> added_c2 = c2-c1
>>> removed_c2 = c1-c2
>>> negative_added_c2 = dict((k, v*-1) for (k, v) in removed_c2.items())
>>> changed_c2 = dict(added_c2)
>>> changed_c2.update(negative_added_c2)
>>> changed_c2
{'a': -1, 'c': -1, 'b': 2, 'd': -2}
>>>

It seems to me, that with negative counts allowed in Counter, this
would simply be the matter of a single difference:
changed_c2 = c2 - c1

Is there a possibility to make the Counter work this way (other than
replacing its methods in a subclass, which might be comparable to
writing the naive counting class itself)?
Are there maybe some reasons I missed to disable negative counts here?
(As I could roughly understand, the Counter isn't quite limited to the
mathematical notion of multiset; it seems to accept negative counts,
but its methods only output the positive part).
Is this kind of task - a comparison in both directions - an unusual
one, or is it simply not the case for Counter?

Thanks in advance,
    vbr


From news123 at free.fr  Sun Mar  7 16:08:39 2010
From: news123 at free.fr (News123)
Date: Sun, 07 Mar 2010 22:08:39 +0100
Subject: killing own process in windows
Message-ID: <4b9415d7$0$19558$426a74cc@news.free.fr>

Hi,


How can I kill my own process?

Some multithreaded programs, that I have are unable to stop when ctrl-C
is pressed.
Some can't be stopped with sys.exit()

So I'd just like to terminate my own program.


Examples of non killable (not killable with CTRL-C) programs:
- A program, that started an XMLRPC server with serve_forever
- a program, that started a multiprocessing.Manager with serve_forever


thanks in advance for some ideas.


N


From news123 at free.fr  Sun Mar  7 16:26:41 2010
From: news123 at free.fr (News123)
Date: Sun, 07 Mar 2010 22:26:41 +0100
Subject: stopping a multiprocessing.managers.BaseManager nicely (looks like
	a hack)
Message-ID: <4b941a11$0$23919$426a74cc@news.free.fr>

Hi,


I have following program

from multiprocessing.managers import BaseManager
def myfunc():	return 3
class MyManager(BaseManager): pass
MyManager.register('myfunc',callable = myfunc)
m = MyManager(address=('127.0.0.1', 50000),authkey='abracadabra')
server = m.get_server()
server.serve_forever()


I'd like to replace server.serve_forever() with something, which is
abortable.

After digging in the sources I came up with following (in my opinion)
inelegant, but working solution.

I just copied the Server.serve_forever() function from
multiprocessing/managers.py and changed two lines.


Does anybody have a better idea than this:
# ------------------------------------------------
import multiprocessing.managers
from multiprocessing.managers import BaseManager
def serve_till_stop(self):
    '''
    Run the server forever
    '''
    #current_process()._manager_server = self # this lin removed
    multiprocessing.managers.current_process()._manager_server = self  #
this line added
    try:
        try:
            #while 1: # this line removed
            while self.running: # this line added
                try:
                    c = self.listener.accept()
                except (OSError, IOError):
                    continue
                t = threading.Thread(target=self.handle_request, args=(c,))
                t.daemon = True
                t.start()
        except (KeyboardInterrupt, SystemExit):
            pass
    finally:
        self.stop = 999
        self.listener.close()


def myfunc():	return 3
def stopme(): server.running = False
class MyManager(BaseManager): pass
MyManager.register('myfunc',callable = myfunc)
m = MyManager(address=('127.0.0.1', 50000),authkey='abracadabra')
server = m.get_server()
server.running = True
serve_till_stop(server)

thanks in advance and bye


N




From martin.hellwig at dcuktec.org  Sun Mar  7 16:28:16 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Sun, 07 Mar 2010 21:28:16 +0000
Subject: killing own process in windows
In-Reply-To: <4b9415d7$0$19558$426a74cc@news.free.fr>
References: <4b9415d7$0$19558$426a74cc@news.free.fr>
Message-ID: <hn15pd$3t7$1@news.eternal-september.org>

On 03/07/10 21:08, News123 wrote:
> Hi,
>
>
> How can I kill my own process?
>
> Some multithreaded programs, that I have are unable to stop when ctrl-C
> is pressed.
> Some can't be stopped with sys.exit()
>
> So I'd just like to terminate my own program.
>
>
> Examples of non killable (not killable with CTRL-C) programs:
> - A program, that started an XMLRPC server with serve_forever
> - a program, that started a multiprocessing.Manager with serve_forever
>
>
> thanks in advance for some ideas.
>
>
> N

If it is just the xml rpc server you want to kill, there might be better 
ways. For example look at:
http://code.google.com/p/dcuktec/source/browse/source/wrapped_xmlrpc_server/rpc.py
with perhaps special interest at the comment on lines 172-174.

-- 
mph


From news123 at free.fr  Sun Mar  7 16:47:51 2010
From: news123 at free.fr (News123)
Date: Sun, 07 Mar 2010 22:47:51 +0100
Subject: stopping a multiprocessing.managers.BaseManager nicely (looks
	like a hack)
In-Reply-To: <4b941a11$0$23919$426a74cc@news.free.fr>
References: <4b941a11$0$23919$426a74cc@news.free.fr>
Message-ID: <4b941f07$0$14923$426a34cc@news.free.fr>

My fix has certain problems:

News123 wrote:
> Hi,
> 
> 
> I have following program
> 
> from multiprocessing.managers import BaseManager
> def myfunc():	return 3
> class MyManager(BaseManager): pass
> MyManager.register('myfunc',callable = myfunc)
> m = MyManager(address=('127.0.0.1', 50000),authkey='abracadabra')
> server = m.get_server()
> server.serve_forever()
> 
> 
> I'd like to replace server.serve_forever() with something, which is
> abortable.
> 
> After digging in the sources I came up with following (in my opinion)
> inelegant, but working solution.
> 
> I just copied the Server.serve_forever() function from
> multiprocessing/managers.py and changed two lines.
> 
> 
> Does anybody have a better idea than this:
> # ------------------------------------------------
> import multiprocessing.managers
> from multiprocessing.managers import BaseManager
> def serve_till_stop(self):
>     '''
>     Run the server forever
>     '''
>     #current_process()._manager_server = self # this lin removed
>     multiprocessing.managers.current_process()._manager_server = self  #
> this line added
>     try:
>         try:
>             #while 1: # this line removed
>             while self.running: # this line added
>                 try:
>                     c = self.listener.accept()
>                 except (OSError, IOError):
>                     continue
>                 t = threading.Thread(target=self.handle_request, args=(c,))
>                 t.daemon = True
>                 t.start()
>         except (KeyboardInterrupt, SystemExit):
>             pass
>     finally:
>         self.stop = 999
>         self.listener.close()
Problems will now occur on he client side.
The server terminates now immediately after the function stopme has been
called.
The client however wants still to perform a few requests, before it
considers calling of stopme done.

So I still don't have a solution :-(

> 
> 
> def myfunc():	return 3
> def stopme(): server.running = False
> class MyManager(BaseManager): pass
> MyManager.register('myfunc',callable = myfunc)
> m = MyManager(address=('127.0.0.1', 50000),authkey='abracadabra')
> server = m.get_server()
> server.running = True
> serve_till_stop(server)
> 
> thanks in advance and bye
> 
> 
> N
> 
> 


From news123 at free.fr  Sun Mar  7 16:54:28 2010
From: news123 at free.fr (News123)
Date: Sun, 07 Mar 2010 22:54:28 +0100
Subject: killing own process in windows
In-Reply-To: <hn15pd$3t7$1@news.eternal-september.org>
References: <4b9415d7$0$19558$426a74cc@news.free.fr>
	<hn15pd$3t7$1@news.eternal-september.org>
Message-ID: <4b942094$0$25784$426a74cc@news.free.fr>

Hi Martin.
Hellwig wrote:
> On 03/07/10 21:08, News123 wrote:
>> Hi,
>>
>>
>> How can I kill my own process?
>>
>> Some multithreaded programs, that I have are unable to stop when ctrl-C
>> is pressed.
>> Some can't be stopped with sys.exit()
>>
>> So I'd just like to terminate my own program.
>>
>>
>> Examples of non killable (not killable with CTRL-C) programs:
>> - A program, that started an XMLRPC server with serve_forever
>> - a program, that started a multiprocessing.Manager with serve_forever
>>
>>
> If it is just the xml rpc server you want to kill, there might be better
> ways. For example look at:
> http://code.google.com/p/dcuktec/source/browse/source/wrapped_xmlrpc_server/rpc.py
> 
> with perhaps special interest at the comment on lines 172-174.
I



Thanks. this looks like a good solution for an XMLRPC server.
However when playing with different server modules I fall over and over
again over code, that can't be shutdown nicely.

Currently I'm still struggling with multiprocessing.managers,BaseManager

bye

N


From arnodel at googlemail.com  Sun Mar  7 17:21:27 2010
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sun, 07 Mar 2010 22:21:27 +0000
Subject: negative "counts" in collections.Counter?
References: <mailman.437.1267995887.23598.python-list@python.org>
Message-ID: <m2eijv4vtk.fsf@googlemail.com>

Vlastimil Brom <vlastimil.brom at gmail.com> writes:

> Hi all,
> I'd like to ask about the possibility of negative "counts" in
> collections.Counter (using Python 3.1);
> I believe, my usecase is rather trivial, basically I have the word
> frequencies of two texts and I want do compare them (e.g. to see what
> was added and removed between different versions of a text).
>
> This is simple enough to do with own code, but I thought, this would
> be exactly the case for Counter...
> However, as the Counter only returns positive counts, one has to get
> the difference in both directions and combine them afterwards, maybe
> something like:
>
>>>> c1=collections.Counter("aabcddd")
>>>> c2=collections.Counter("abbbd")
>>>> added_c2 = c2-c1
>>>> removed_c2 = c1-c2
>>>> negative_added_c2 = dict((k, v*-1) for (k, v) in removed_c2.items())
>>>> changed_c2 = dict(added_c2)
>>>> changed_c2.update(negative_added_c2)
>>>> changed_c2
> {'a': -1, 'c': -1, 'b': 2, 'd': -2}
>>>>
>
> It seems to me, that with negative counts allowed in Counter, this
> would simply be the matter of a single difference:
> changed_c2 = c2 - c1
>
> Is there a possibility to make the Counter work this way (other than
> replacing its methods in a subclass, which might be comparable to
> writing the naive counting class itself)?
> Are there maybe some reasons I missed to disable negative counts here?
> (As I could roughly understand, the Counter isn't quite limited to the
> mathematical notion of multiset; it seems to accept negative counts,
> but its methods only output the positive part).
> Is this kind of task - a comparison in both directions - an unusual
> one, or is it simply not the case for Counter?

Every time I have needed something like collections.Counter, I have
wanted the behaviour you require too.  As a result, I have never used
collections.Counter.  Instead I have used plain dictionaries or my own
class.

I don't understand why the Counter's + and - operators behave as they
do.  Here is an example from the docs:

>>> c = Counter(a=3, b=1)
>>> d = Counter(a=1, b=2)
>>> c + d                       # add two counters together:  c[x] + d[x]
Counter({'a': 4, 'b': 3})
>>> c - d                       # subtract (keeping only positive counts)
Counter({'a': 2})
>>> c & d                       # intersection:  min(c[x], d[x])
Counter({'a': 1, 'b': 1})
>>> c | d                       # union:  max(c[x], d[x])
Counter({'a': 3, 'b': 2})

If + and - just added or subtracted the multiplicities of elements,
keeping negative multiplicites, we would get:

>>> c - d
Counter({'a':2, 'b':-1})

Which I think is useful in many cases.  But we could still get the
result of current c - d very simply:

>>> (c - d) | Counter() # | Counter() removes negative multiplicities
Counter({'a':2})

Altogether more versatile and coherent IMHO.

-- 
Arnaud


From martin.hellwig at dcuktec.org  Sun Mar  7 17:27:48 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Sun, 07 Mar 2010 22:27:48 +0000
Subject: killing own process in windows
In-Reply-To: <4b942094$0$25784$426a74cc@news.free.fr>
References: <4b9415d7$0$19558$426a74cc@news.free.fr>
	<hn15pd$3t7$1@news.eternal-september.org>
	<4b942094$0$25784$426a74cc@news.free.fr>
Message-ID: <hn1991$s2d$1@news.eternal-september.org>

On 03/07/10 21:54, News123 wrote:
> Hi Martin.
> Hellwig wrote:
>> On 03/07/10 21:08, News123 wrote:
>>> Hi,
>>>
>>>
>>> How can I kill my own process?
>>>
>>> Some multithreaded programs, that I have are unable to stop when ctrl-C
>>> is pressed.
>>> Some can't be stopped with sys.exit()
>>>
>>> So I'd just like to terminate my own program.
>>>
>>>
>>> Examples of non killable (not killable with CTRL-C) programs:
>>> - A program, that started an XMLRPC server with serve_forever
>>> - a program, that started a multiprocessing.Manager with serve_forever
>>>
>>>
>> If it is just the xml rpc server you want to kill, there might be better
>> ways. For example look at:
>> http://code.google.com/p/dcuktec/source/browse/source/wrapped_xmlrpc_server/rpc.py
>>
>> with perhaps special interest at the comment on lines 172-174.
> I
>
>
>
> Thanks. this looks like a good solution for an XMLRPC server.
> However when playing with different server modules I fall over and over
> again over code, that can't be shutdown nicely.
>
> Currently I'm still struggling with multiprocessing.managers,BaseManager
>
> bye
>
> N

I haven't used the multiprocessing module yet, but generally speaking I 
believe that everything in python that is server-like inherits from 
SocketServer BaseServer. Probably for you to have all servers behave in 
a way you expect, is to override functionality there, for example in:
http://docs.python.org/library/socketserver.html?highlight=baseserver#SocketServer.BaseServer
the function: handle_request

Though from looking at the source the function serve_forever is just an 
while loop over handle request (blocking or no-blocking), so might be a 
better candidate to replace.

But you still might find that some tcp connections remain open, so 
unless you want to go down to the socket level and explicit close the 
socket, there is not much you can do about that.

For the client side, socket timeout is you enemy, I found something 
rather long as default (300 seconds in the xml-rpc client) but yours 
might be different (it is probably a Python defined standard default, 
but I haven't checked that).

Sounds to me like you will be busy reading up on it now :-)

Oh and just a word to prevent over-engineering, if both the server and 
client is written by you, a lot of problems you anticipate will probably 
never occur because that would require a rogue server or client. Unless 
of course you like making rogue server/clients :-)

-- 
mph


From lists at cheimes.de  Sun Mar  7 17:36:54 2010
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 07 Mar 2010 23:36:54 +0100
Subject: killing own process in windows
In-Reply-To: <4b9415d7$0$19558$426a74cc@news.free.fr>
References: <4b9415d7$0$19558$426a74cc@news.free.fr>
Message-ID: <hn19q6$82n$1@dough.gmane.org>

News123 wrote:
> Hi,
> 
> 
> How can I kill my own process?
> 
> Some multithreaded programs, that I have are unable to stop when ctrl-C
> is pressed.
> Some can't be stopped with sys.exit()

You have to terminate the XMP-RPC server or the manager first. Check the
docs!

You can terminate a Python process with os._exit() but I recommend that
you find another way. os._exit() is a hard termination. It kills the
process without running any cleanup code like atexit handlers and
Python's internal cleanups. Open files aren't flushed to disk etc.

Christian



From news123 at free.fr  Sun Mar  7 18:01:39 2010
From: news123 at free.fr (News123)
Date: Mon, 08 Mar 2010 00:01:39 +0100
Subject: killing own process in windows
In-Reply-To: <mailman.438.1268001428.23598.python-list@python.org>
References: <4b9415d7$0$19558$426a74cc@news.free.fr>
	<mailman.438.1268001428.23598.python-list@python.org>
Message-ID: <4b943053$0$25136$426a74cc@news.free.fr>

Hi Cristian,

Christian Heimes wrote:
> News123 wrote:
>> Hi,
>>
>>
>> How can I kill my own process?
>>
>> Some multithreaded programs, that I have are unable to stop when ctrl-C
>> is pressed.
>> Some can't be stopped with sys.exit()
> 
> You have to terminate the XMP-RPC server or the manager first. Check the
> docs!
> 
> You can terminate a Python process with os._exit() but I recommend that
> you find another way. os._exit() is a hard termination. It kills the
> process without running any cleanup code like atexit handlers and
> Python's internal cleanups. Open files aren't flushed to disk etc.
> 

This is exactly the problem:
Neither the XMLRPC server nor the manager can be stopped
both serve forever. The doc doesn't really help.

For the XMLRPC server there are tricks to subclass it and to change the
behaviour, as indicated by Martin.

for the manager I did not find a clean solution (Plese see my other
thread "stopping a multiprocessing.manage.....")


I'm  surprised, that there are no 'canned' solution to stop servers
remotely or just by pressing ctrl-C
I consider this being quite useful for certain kinds of applications.

I prefer to ask a server to shutdown, than to just kill him.

Am interactive program, which also acts like a server should be able
to shutdown its server thread from the main thread  in order to quit nicely.


Baseserver has even a shutdown method(), but it cannot be called if
were started with serve_forever().

N







From googler.1.webmaster at spamgourmet.com  Sun Mar  7 18:29:42 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Sun, 7 Mar 2010 15:29:42 -0800 (PST)
Subject: time_struct
References: <23dbe409-60ed-4f6f-bd38-4336e4f1b3d0@f8g2000yqn.googlegroups.com>
Message-ID: <d89d75c5-2e65-4779-9122-c3a5e1d07e96@b7g2000yqd.googlegroups.com>

any ideas?


From rjngrj2010 at gmail.com  Sun Mar  7 18:33:16 2010
From: rjngrj2010 at gmail.com (gujax)
Date: Sun, 7 Mar 2010 15:33:16 -0800 (PST)
Subject: Window crash/freeze after "python test.py" in \Gnuplot
Message-ID: <3d586615-f79c-4657-bcaf-58287d5c8917@g11g2000yqe.googlegroups.com>

Hi,
My computer OS is Win ME, and I am running a Py2.5 version. Gnuplot is
v4.2, Gnuplot_py is v1.8. However, whenever I give a command "python
test.py" to test Gnuplot_py, I sometimes get message "
#Gnuplot.................for enjoyment
#press return to open a window
>..
>clear terminal
....#####test function#######
and then computer hangs. I never see any windows appearing. A blue
screen appears with request for cntrl-alt-del.

I cannot exactly determine the messages because the crash occurs
relatively fast therefore some sentences above may not be accurate.

I have tried this with many scripts which use Gnuplot for plotting but
it results in same crashes e.g. demo.py in gnuplot_py.
I really have no clue what should be my next step. Any help will be
appreicated.

I however, can run Gnuplot by typing "pgnuplot" or "wgnuplot" in the
command shell and it opens a Gnuplot window. Therefore, it looks like
some incompatibility between gnuplot_py, python2.5?
Thanks,
gujax


From floaiza2 at gmail.com  Sun Mar  7 18:55:14 2010
From: floaiza2 at gmail.com (floaiza)
Date: Sun, 7 Mar 2010 15:55:14 -0800 (PST)
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
Message-ID: <182de09d-417b-4ad7-8351-23a44e26fea6@15g2000yqi.googlegroups.com>

I don't think there is any doubt about the value of relational
databases, particularly on the Internet. The issue in my mind is how
to leverage all the information that resides in the "deep web" using
strictly the relational database paradigm.

Because that paradigm imposes a tight and rigid coupling between
semantics and syntax when you attempt to efficiently "merge" or
"federate" data from disparate sources you can find yourself spending
a lot of time and money building mappings and maintaining translators.

That's why approaches that try to separate syntax from the semantics
are now becoming so popular, but, again, as others have said, it is
not a matter of replacing one with the other, but of figuring out how
best to exploit what each technology offers.

I base my remarks on some initial explorations I have made on the use
of RDF Triple Stores, which, by the way, use RDBMSs to persist the
triples, but which offer a really high degree of flexibility WRT the
merging and federating of data from different semantic spaces.

The way I hope things will move forward is that eventually it will
become inexpensive and easy to "expose" as RDF triples all the
relevant data that now sits in special-purpose databases.

(just an opinion)

Francisco

On Mar 3, 12:36?pm, Xah Lee <xah... at gmail.com> wrote:
> recently i wrote a blog article on The NoSQL Movement
> athttp://xahlee.org/comp/nosql.html
>
> i'd like to post it somewhere public to solicit opinions, but in the
> 20 min or so, i couldn't find a proper newsgroup, nor private list
> that my somewhat anti-NoSQL Movement article is fitting.
>
> So, i thought i'd post here to solicit some opinins from the programer
> community i know.
>
> Here's the plain text version
>
> -----------------------------
> The NoSQL Movement
>
> Xah Lee, 2010-01-26
>
> In the past few years, there's new fashionable thinking about anti
> relational database, now blessed with a rhyming term: NoSQL.
> Basically, it considers that relational database is outdated, and not
> ?horizontally? scalable. I'm quite dubious of these claims.
>
> According to Wikipedia Scalability article, verticle scalability means
> adding more resource to a single node, such as more cpu, memory. (You
> can easily do this by running your db server on a more powerful
> machine.), and ?Horizontal scalability? means adding more machines.
> (and indeed, this is not simple with sql databases, but again, it is
> the same situation with any software, not just database. To add more
> machines to run one single software, the software must have some sort
> of grid computing infrastructure built-in. This is not a problem of
> the software per se, it is just the way things are. It is not a
> problem of databases.)
>
> I'm quite old fashioned when it comes to computer technology. In order
> to convience me of some revolutionary new-fangled technology, i must
> see improvement based on math foundation. I am a expert of SQL, and
> believe that relational database is pretty much the gist of database
> with respect to math. Sure, a tight definition of relations of your
> data may not be necessary for many applications that simply just need
> store and retrieve and modify data without much concern about the
> relations of them. But still, that's what relational database
> technology do too. You just don't worry about normalizing when you
> design your table schema.
>
> The NoSQL movement is really about scaling movement, about adding more
> machines, about some so-called ?cloud computing? and services with
> simple interfaces. (like so many fashionable movements in the
> computing industry, often they are not well defined.) It is not really
> about anti relation designs in your data. It's more about adding
> features for practical need such as providing easy-to-user APIs (so
> you users don't have to know SQL or Schemas), ability to add more
> nodes, provide commercial interface services to your database, provide
> parallel systems that access your data. Of course, these needs are all
> done by any big old relational database companies such as Oracle over
> the years as they constantly adopt the changing industry's needs and
> cheaper computing power. If you need any relations in your data, you
> can't escape relational database model. That is just the cold truth of
> math.
>
> Importat data, such as used in the bank transactions, has relations.
> You have to have tight relational definitions and assurance of data
> integrity.
>
> Here's a second hand quote from Microsoft's Technical Fellow David
> Campbell. Source
>
> ? ? I've been doing this database stuff for over 20 years and I
> ? ? remember hearing that the object databases were going to wipe out
> ? ? the SQL databases. And then a little less than 10 years ago the
> ? ? XML databases were going to wipe out.... We actually ... you
> ? ? know... people inside Microsoft, [have said] 'let's stop working
> ? ? on SQL Server, let's go build a native XML store because in five
> ? ? years it's all going....'
>
> LOL. That's exactly my thought.
>
> Though, i'd have to have some hands on experience with one of those
> new database services to see what it's all about.
>
> --------------------
> Amazon S3 and Dynamo
>
> Look at Structured storage. That seems to be what these nosql
> databases are. Most are just a key-value pair structure, or just
> storage of documents with no relations. I don't see how this differ
> from a sql database using one single table as schema.
>
> Amazon's Amazon S3 is another storage service, which uses Amazon's
> Dynamo (storage system), indicated by Wikipedia to be one of those
> NoSQL db. Looking at the S3 and Dynamo articles, it appears the db is
> just a Distributed hash table system, with added http access
> interface. So, basically, little or no relations. Again, i don't see
> how this is different from, say, MySQL with one single table of 2
> columns, added with distributed infrastructure. (distributed database
> is often a integrated feature of commercial dbs, e.g. Wikipedia Oracle
> database article cites Oracle Real Application Clusters )
>
> Here's a interesting quote on S3:
>
> ? ? Bucket names and keys are chosen so that objects are addressable
> ? ? using HTTP URLs:
>
> ? ? ? ? *http://s3.amazonaws.com/bucket/key
> ? ? ? ? *http://bucket.s3.amazonaws.com/key
> ? ? ? ? *http://bucket/key(where bucket is a DNS CNAME record
> pointing to bucket.s3.amazonaws.com)
>
> ? ? Because objects are accessible by unmodified HTTP clients, S3 can
> ? ? be used to replace significant existing (static) web hosting
> ? ? infrastructure.
>
> So this means, for example, i can store all my images in S3, and in my
> html document, the inline images are just normal img tags with normal
> urls. This applies to any other type of file, pdf, audio, but html
> too. So, S3 becomes the web host server as well as the file system.
>
> Here's Amazon's instruction on how to use it as image server. Seems
> quite simple: How to use Amazon S3 for hosting web pages and media
> files? Source
>
> --------------------
> Google BigTable
>
> Another is Google's BigTable. I can't make much comment. To make a
> sensible comment, one must have some experience of actually
> implementing a database. For example, a file system is a sort of
> database. If i created a scheme that allows me to access my data as
> files in NTFS that are distributed over hundreds of PC, communicated
> thru http running Apache. This will let me access my files. To insert,
> delete, data, one can have cgi scripts on each machine. Would this be
> considered as a new fantastic NoNoSQL?
>
> ---------------------
>
> comments can also be posted tohttp://xahlee.blogspot.com/2010/01/nosql-movement.html
>
> Thanks.
>
> ? Xah
> ?http://xahlee.org/
>
> ?



From moc.liamg at synabp.reverse_the_string  Sun Mar  7 19:18:13 2010
From: moc.liamg at synabp.reverse_the_string (=?UTF-8?B?UGF3ZcWCIEJhbnnFmw==?=)
Date: Mon, 08 Mar 2010 01:18:13 +0100
Subject: running a program on many processors
Message-ID: <hn1ft2$i5l$1@atlantis.news.neostrada.pl>

Hello,

I have already read about Python and multiprocessing which allows using
many processors. The idea is to split a program into separate tasks and
run each of them on a separate processor. However I want to run a Python
program doing a single simple task on many processors so that their
cumulative power is available to the program as if there was one huge
CPU instead of many separate ones. Is it possible? How can it be achieved?

Best regards,

Pawe?


From deets at nospam.web.de  Sun Mar  7 19:28:48 2010
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 08 Mar 2010 01:28:48 +0100
Subject: running a program on many processors
In-Reply-To: <hn1ft2$i5l$1@atlantis.news.neostrada.pl>
References: <hn1ft2$i5l$1@atlantis.news.neostrada.pl>
Message-ID: <7vium2FgvmU1@mid.uni-berlin.de>

Am 08.03.10 01:18, schrieb Pawe? Bany?:
> Hello,
>
> I have already read about Python and multiprocessing which allows using
> many processors. The idea is to split a program into separate tasks and
> run each of them on a separate processor. However I want to run a Python
> program doing a single simple task on many processors so that their
> cumulative power is available to the program as if there was one huge
> CPU instead of many separate ones. Is it possible? How can it be achieved?


That's impossible to answer without knowing anything about your actual 
task. Not everything is parallelizable, or algorithms suffer from 
penalties if parallelization is overdone.

So in essence, what you've read already covers it: if your "simple task" 
is dividable in several, independent sub-tasks that don't need 
serialization, multiprocessing is your friend.

Diez


From g.bogle at auckland.no.spam.ac.nz  Sun Mar  7 19:49:07 2010
From: g.bogle at auckland.no.spam.ac.nz (Gib Bogle)
Date: Mon, 08 Mar 2010 13:49:07 +1300
Subject: running a program on many processors
References: <hn1ft2$i5l$1@atlantis.news.neostrada.pl>
Message-ID: <hn1hi3$9hi$3@speranza.aioe.org>

Pawe? Bany? wrote:
...
How can it be achieved?

Very carefully.


From steve at REMOVE-THIS-cybersource.com.au  Sun Mar  7 20:08:32 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 08 Mar 2010 01:08:32 GMT
Subject: running a program on many processors
References: <hn1ft2$i5l$1@atlantis.news.neostrada.pl>
Message-ID: <4b944e10$0$8836$c3e8da3@news.astraweb.com>

On Mon, 08 Mar 2010 01:18:13 +0100, Pawe? Bany? wrote:

> Hello,
> 
> I have already read about Python and multiprocessing which allows using
> many processors. The idea is to split a program into separate tasks and
> run each of them on a separate processor. However I want to run a Python
> program doing a single simple task on many processors so that their
> cumulative power is available to the program as if there was one huge
> CPU instead of many separate ones. Is it possible? How can it be
> achieved?

Try Parallel Python.

http://www.parallelpython.com/

I haven't used it, but it looks interesting.

However, the obligatory warning against premature optimization: any sort 
of parallel execution (including even lightweight threads) is hard to 
build and much harder to debug. You should make sure that the potential 
performance benefits are worth the pain before you embark on the job: are 
you sure that the naive, single process version isn't fast enough?


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sun Mar  7 20:14:43 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 08 Mar 2010 01:14:43 GMT
Subject: best practices: is collections.defaultdict my friend or not?
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
	<20100306031003.1018aab2@geekmail.INVALID>
	<3ae40c74-7bee-4c6c-9ed2-7a73675f8040@v20g2000prb.googlegroups.com>
	<mailman.421.1267954386.23598.python-list@python.org>
Message-ID: <4b944f83$0$8836$c3e8da3@news.astraweb.com>

On Sun, 07 Mar 2010 09:33:22 +0000, Mark Lawrence wrote:

>> I was a little frightened of doing "import this" ("Hey, kid, run rm -
>> rf / and see what happens!"), but did, and the words are wise.
>> 
>> Pete
> 
> After reading the words of wisdom try "import this" a second time and
> watch what happens, it's quite interesting if you're not expecting the
> output.

<raises eyebrow>

You weren't expecting to get the Python prompt?


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sun Mar  7 20:46:28 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 08 Mar 2010 01:46:28 GMT
Subject: negative "counts" in collections.Counter?
References: <mailman.437.1267995887.23598.python-list@python.org>
	<m2eijv4vtk.fsf@googlemail.com>
Message-ID: <4b9456f4$0$8836$c3e8da3@news.astraweb.com>

On Sun, 07 Mar 2010 22:21:27 +0000, Arnaud Delobelle wrote:

> Vlastimil Brom <vlastimil.brom at gmail.com> writes:
> 
>> Hi all,
>> I'd like to ask about the possibility of negative "counts" in
>> collections.Counter (using Python 3.1); I believe, my usecase is rather
>> trivial, basically I have the word frequencies of two texts and I want
>> do compare them (e.g. to see what was added and removed between
>> different versions of a text).

[...]

> Every time I have needed something like collections.Counter, I have
> wanted the behaviour you require too.  As a result, I have never used
> collections.Counter.  Instead I have used plain dictionaries or my own
> class.

Vlastimil and Arnaud,

It looks like Counter already has negative counts in Python 3.1:

>>> import collections
>>> c = collections.Counter({'red': 2, 'green': 0, 'blue': -5})
>>> c['blue'] -= 1
>>> c
Counter({'red': 2, 'green': 0, 'blue': -6})
>>> c['blue'] += 1
>>> c
Counter({'red': 2, 'green': 0, 'blue': -5})

But the + and - operators destroy negative and zero counts:

>>> c + collections.Counter({'blue': 1})
Counter({'red': 2})

I can't imagine what the use-case for that behaviour is.

Given that Counter supports negative counts, it looks to me that the 
behaviour of __add__ and __sub__ is fundamentally flawed. You should 
raise a bug report (feature enhancement) on the bug tracker.

http://bugs.python.org/

Given that this will change the documented behaviour, it will help if you 
give a short, simple idiom for removing zero and negative elements, 
Arnaud's trick with | Counter().

When you raise the report, please post an update here.



-- 
Steven


From gagsl-py2 at yahoo.com.ar  Sun Mar  7 21:00:41 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 07 Mar 2010 23:00:41 -0300
Subject: A "scopeguard" for Python
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<hmm0rd$a48$1@news.eternal-september.org>
	<mailman.211.1267636174.23598.python-list@python.org>
	<hmm5ln$arg$1@news.eternal-september.org>
	<mailman.221.1267642316.23598.python-list@python.org>
	<hmmdgd$17s$1@news.eternal-september.org>
	<mailman.241.1267650180.23598.python-list@python.org>
	<hmmkmh$mt1$1@news.eternal-september.org>
	<mailman.260.1267658935.23598.python-list@python.org>
	<hmn03d$5r6$1@news.eternal-september.org>
	<mailman.292.1267717742.23598.python-list@python.org>
	<hmooo6$pg0$1@news.eternal-september.org>
	<mailman.300.1267723245.23598.python-list@python.org>
	<hmoul7$2i9$1@news.eternal-september.org>
	<mailman.314.1267744631.23598.python-list@python.org>
	<hmph3b$20o$1@news.eternal-september.org>
Message-ID: <op.u877vfs4x6zn5v@gabriel.sleipnir-bsas>

En Thu, 04 Mar 2010 20:52:04 -0300, Alf P. Steinbach <alfps at start.no>  
escribi?:

> Sorry, as with the places noted above, I can't understand what you're  
> trying to say here.

Regarding your posts, neither can I. All the time. Sorry, deciphering your  
posts would force me to spend much more time than available and I can't  
afford that - so I'm blocking your messages from now on.

-- 
Gabriel Genellina



From martin.hellwig at dcuktec.org  Sun Mar  7 21:08:39 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Mon, 08 Mar 2010 02:08:39 +0000
Subject: running a program on many processors
In-Reply-To: <hn1ft2$i5l$1@atlantis.news.neostrada.pl>
References: <hn1ft2$i5l$1@atlantis.news.neostrada.pl>
Message-ID: <hn1m73$9g7$1@news.eternal-september.org>

On 03/08/10 00:18, Pawe? Bany? wrote:
> Hello,
>
> I have already read about Python and multiprocessing which allows using
> many processors. The idea is to split a program into separate tasks and
> run each of them on a separate processor. However I want to run a Python
> program doing a single simple task on many processors so that their
> cumulative power is available to the program as if there was one huge
> CPU instead of many separate ones. Is it possible? How can it be achieved?
>
> Best regards,
>
> Pawe?

As far as I know, the Python VM (cpython) will not analyze your code and 
automatically spread parts over different processing units.

I did read, two years or so ago, that AMD was looking in to something 
that does just what you say on a cpu level, that is present itself as 
one logical cpu but underneath there are multiple physical ones. I 
wouldn't hold my breath though waiting for it.

-- 
mph


From monkey at joemoney.net  Sun Mar  7 21:10:00 2010
From: monkey at joemoney.net (monkeys paw)
Date: Sun, 07 Mar 2010 21:10:00 -0500
Subject: write to remote ile
Message-ID: <WpqdnTgN4vzhwQnWnZ2dnUVZ_tOdnZ2d@insightbb.com>

I can xfer a file from a remote server using:

import urllib2 as u
x=u.urlopen('http://tycho.usno.navy.mil/cgi-bin/timer.pl')

for line in x:
     print line


How can i write a file to the remote server?

I tried:

x = u.url.open('http://joemoney.net/somefile.txt', 'w')

but that does not work


From martin.hellwig at dcuktec.org  Sun Mar  7 21:20:20 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Mon, 08 Mar 2010 02:20:20 +0000
Subject: write to remote ile
In-Reply-To: <WpqdnTgN4vzhwQnWnZ2dnUVZ_tOdnZ2d@insightbb.com>
References: <WpqdnTgN4vzhwQnWnZ2dnUVZ_tOdnZ2d@insightbb.com>
Message-ID: <hn1msv$95d$1@news.eternal-september.org>

On 03/08/10 02:10, monkeys paw wrote:
> I can xfer a file from a remote server using:
>
> import urllib2 as u
> x=u.urlopen('http://tycho.usno.navy.mil/cgi-bin/timer.pl')
>
> for line in x:
> print line
>
>
> How can i write a file to the remote server?
>
> I tried:
>
> x = u.url.open('http://joemoney.net/somefile.txt', 'w')
>
> but that does not work

How do you normally (i.e. without python) put files on a remote server?

-- 
mph


From jmheralds at gmail.com  Sun Mar  7 21:32:08 2010
From: jmheralds at gmail.com (James Heralds)
Date: Sun, 7 Mar 2010 18:32:08 -0800 (PST)
Subject: Call for papers: SETP-10, USA, July 2010
Message-ID: <84762688-eaf6-4e4e-a903-791e7e2bc2c7@j27g2000yqn.googlegroups.com>

It would be highly appreciated if you could share this announcement
with your colleagues, students and individuals whose research is in
software engineering, software testing, software quality assurance,
software design and related areas.

Call for papers: SETP-10, USA, July 2010

The 2010 International Conference on Software Engineering Theory and
Practice (SETP-10) (website: http://www.PromoteResearch.org ) will be
held during 12-14 of July 2010 in Orlando, FL, USA.  SETP is an
important event in the areas of Software development, maintenance, and
other areas of software engineering and related topics.

The conference will be held at the same time and location where
several other major international conferences will be taking place.
The conference will be held as part of 2010 multi-conference
(MULTICONF-10). MULTICONF-10 will be held during July 12-14, 2010 in
Orlando, Florida, USA. The primary goal of MULTICONF is to promote
research and developmental activities in computer science, information
technology, control engineering, and related fields. Another goal is
to promote the dissemination of research to a multidisciplinary
audience and to facilitate communication among researchers,
developers, practitioners in different fields. The following
conferences are planned to be organized as part of MULTICONF-10.

?	International Conference on Artificial Intelligence and Pattern
Recognition (AIPR-10)
?	 International Conference on Automation, Robotics and Control
Systems (ARCS-10)
?	International Conference on Bioinformatics, Computational Biology,
Genomics and Chemoinformatics (BCBGC-10)
?	International Conference on Computer Communications and Networks
(CCN-10)
?	International Conference on Enterprise Information Systems and Web
Technologies (EISWT-10)
?	International Conference on High Performance Computing Systems
(HPCS-10)
?	International Conference on Information Security and Privacy
(ISP-10)
?	International Conference on Image and Video Processing and Computer
Vision (IVPCV-10)
?	International Conference on Software Engineering Theory and Practice
(SETP-10)
?	International Conference on Theoretical and Mathematical Foundations
of Computer Science (TMFCS-10)

MULTICONF-10 will be held at Imperial Swan Hotel and Suites.  It is a
full-service resort that puts you in the middle of the fun! Located
1/2 block south of the famed International Drive, the hotel is just
minutes from great entertainment like Walt Disney World? Resort,
Universal Studios and Sea World Orlando. Guests can enjoy free
scheduled transportation to these theme parks, as well as spacious
accommodations, outdoor pools and on-site dining ? all situated on 10
tropically landscaped acres. Here, guests can experience a full-
service resort with discount hotel pricing in Orlando.


We invite draft paper submissions. Please see the website
http://www.PromoteResearch.org  for more details.

Sincerely
James Heralds


From python at bdurham.com  Sun Mar  7 21:41:30 2010
From: python at bdurham.com (python at bdurham.com)
Date: Sun, 07 Mar 2010 21:41:30 -0500
Subject: Best practice way to detect internet connectivity under Python
	2.6/Windows
Message-ID: <1268016090.13219.1363604225@webmail.messagingengine.com>

Is the best pratice way to detect internet connectivity under
Windows (using Python 2.6) simply to attempt to access a known
internet website using urllib or urlib2 wrapped in a try/except
construct?

Thank you,
Malcolm
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From monkey at joemoney.net  Sun Mar  7 21:51:22 2010
From: monkey at joemoney.net (monkeys paw)
Date: Sun, 07 Mar 2010 21:51:22 -0500
Subject: write to remote ile
In-Reply-To: <hn1msv$95d$1@news.eternal-september.org>
References: <WpqdnTgN4vzhwQnWnZ2dnUVZ_tOdnZ2d@insightbb.com>
	<hn1msv$95d$1@news.eternal-september.org>
Message-ID: <f--dnSFN38yw-wnWnZ2dnUVZ_gadnZ2d@insightbb.com>

On 3/7/2010 9:20 PM, Martin P. Hellwig wrote:
> On 03/08/10 02:10, monkeys paw wrote:
>> I can xfer a file from a remote server using:
>>
>> import urllib2 as u
>> x=u.urlopen('http://tycho.usno.navy.mil/cgi-bin/timer.pl')
>>
>> for line in x:
>> print line
>>
>>
>> How can i write a file to the remote server?
>>
>> I tried:
>>
>> x = u.url.open('http://joemoney.net/somefile.txt', 'w')
>>
>> but that does not work
>
> How do you normally (i.e. without python) put files on a remote server?
>
Using FTP, i'm really having a brain cramp here, but i'm new to python


From martin.hellwig at dcuktec.org  Sun Mar  7 21:53:46 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Mon, 08 Mar 2010 02:53:46 +0000
Subject: write to remote ile
In-Reply-To: <f--dnSFN38yw-wnWnZ2dnUVZ_gadnZ2d@insightbb.com>
References: <WpqdnTgN4vzhwQnWnZ2dnUVZ_tOdnZ2d@insightbb.com>
	<hn1msv$95d$1@news.eternal-september.org>
	<f--dnSFN38yw-wnWnZ2dnUVZ_gadnZ2d@insightbb.com>
Message-ID: <hn1ork$edf$1@news.eternal-september.org>

On 03/08/10 02:51, monkeys paw wrote:
> On 3/7/2010 9:20 PM, Martin P. Hellwig wrote:
>> On 03/08/10 02:10, monkeys paw wrote:
>>> I can xfer a file from a remote server using:
>>>
>>> import urllib2 as u
>>> x=u.urlopen('http://tycho.usno.navy.mil/cgi-bin/timer.pl')
>>>
>>> for line in x:
>>> print line
>>>
>>>
>>> How can i write a file to the remote server?
>>>
>>> I tried:
>>>
>>> x = u.url.open('http://joemoney.net/somefile.txt', 'w')
>>>
>>> but that does not work
>>
>> How do you normally (i.e. without python) put files on a remote server?
>>
> Using FTP, i'm really having a brain cramp here, but i'm new to python

We all been there, in some for or other ;-), anyway you might want to 
have a look at this:
http://docs.python.org/library/ftplib.html

-- 
mph


From missive at hotmail.com  Sun Mar  7 22:01:02 2010
From: missive at hotmail.com (Lee Harr)
Date: Mon, 8 Mar 2010 07:31:02 +0430
Subject: [ANNC] pynguin-0.2 (python turtle graphics application)
Message-ID: <SNT106-W23D8598384B1310649531FB1350@phx.gbl>


Pynguin is a python-based turtle graphics application.
??? It combines an editor, interactive interpreter, and
??? graphics display area.

It is meant to be an easy environment for introducing
??? some programming concepts to beginning programmers.


http://pynguin.googlecode.com/


This release continues adding basic functionality and
??? corrects some annoyances. If you are interested,
??? please take a look and let me know what you think.


Pynguin is tested with Python 2.6.4 and uses PyQt (4.6)
??? for its GUI elements. Pynguin is released under GPLv3.


Changes in pynguin-0.2:
??? - added fill mode
??? - added basic auto-indent in editor
??? - added quick links to recent documents
??? - added quick links to example files
??? - even out speeds when drawing short line segments
??? - added animated circle drawing
??? - now exports entire drawing, even if not visible on screen
??? - fixed initial drawing speed to match menu
??? - fixed-width fonts in editor and interactive interpreter
??? - added classic turtle image
??? - file browser now starts in user's home directory
??? - removed scrollbars on graphic view
??? - now extends lines when animating

 		 	   		  
_________________________________________________________________
Hotmail: Trusted email with Microsoft?s powerful SPAM protection.
https://signup.live.com/signup.aspx?id=60969


From greg.ewing at canterbury.ac.nz  Sun Mar  7 22:09:12 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Mon, 08 Mar 2010 16:09:12 +1300
Subject: Reverse engineering CRC?
Message-ID: <7vj7fdFnnjU1@mid.individual.net>

Given some known data/crc pairs, how feasible is it to
figure out the polynomial being used to generate the crc?

In the case I'm looking at, it appears that the crc
size may be at least 24 bits, so just trying all possible
polynomials probably isn't doable.

An article I found hints at the possibility of using
GCDs to make the search more efficient, but doesn't go
into any details. Anyone know of any literature about
this?

If it helps, I have the ability to generate test cases
with known message contents to some extent, although
I don't have complete control over the contents. Also
it's a manual process, so generating large numbers of
them automatically isn't an option.

-- 
Greg


From python at bdurham.com  Sun Mar  7 22:09:44 2010
From: python at bdurham.com (python at bdurham.com)
Date: Sun, 07 Mar 2010 22:09:44 -0500
Subject: IMAP mail filters tool
In-Reply-To: <4B9097A6.2050600@seehart.com>
References: <4B9097A6.2050600@seehart.com>
Message-ID: <1268017784.16962.1363607281@webmail.messagingengine.com>

Ken,

Check out Zed Shaw's very cool Lamson project.
http://lamsonproject.org/

Malcolm

----- Original message -----
From: "Ken Seehart" <ken at seehart.com>
To: python-list at python.org
Date: Thu, 04 Mar 2010 21:33:26 -0800
Subject: IMAP mail filters tool
I'm thinking of possibly making a simple client-agnostic tool for
filtering and processing IMAP email.  I'm a Thunderbird user, but
I'm interested in a tool that is not client software specific.
So I am is checking for prior art.  Does anyone know of a filter
tool with most of these features?
  * Written and customizable with python
  * IMAP based
  * Runs on client (i.e. without installing anything on the
    server)
  * Runs completely independent of client software (though could
    be launched from any email client that can support it)
  * Automatically suggests new rules based on manual movement of
    emails into folders (based on comparison of all header data
    across all existing folders)
  * Take arbitrary actions in response to rules (e.g. universally
    denying access to spam senders to all online cheese shops)
  * Capable of serving as a prototyping framework for things like
    spam filtering
  * General filtering functionality, not particularly focused on
    spam
  * Posts and updates rules to server via IMAP (i.e. by sending
    and automagically processing a special email message).

Typical work-flow would be aimed at users who like to
automatically sort their email prior to reading it.  The goal is
to have nearly all email sorted into folders so that most mail
remaining in the Inbox is likely to be leftover spam missed by
whatever spam filters are being used.  In other words, the
filters tend to effectively serve as white lists.
Examples of unusual rules that don't seem to be supported by most
email clients:
  * When you send an email, add the recipient to a filter such
    that email from that recipient goes to a "Unfiltered Replies"
    folder if it does not match any other filter.
  * Receiving email with certain fields matching certain regular
    expressions could automatically create a new folder and
    filter e.g.:
       + List-Id: "SF Bay Area Python group
         <baypiggies.python.org>" yields a new folder "Lists/SF
         Bay Area Python group" with a corresponding rule
       + X-Launchpad-Bug: "product=phatch; milestone=..." yields
         a new folder "Bugs/Phatch" with a corresponding rule
       + X-Bugzilla-Product: "Shrubbery" yields a new folder
         "Bugs/Shrubbery" with a corresponding rule

Thanks,
Ken
--
http://mail.python.org/mailman/listinfo/python-list
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From steve at REMOVE-THIS-cybersource.com.au  Sun Mar  7 22:41:35 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 08 Mar 2010 03:41:35 GMT
Subject: Reverse engineering CRC?
References: <7vj7fdFnnjU1@mid.individual.net>
Message-ID: <4b9471ee$0$8836$c3e8da3@news.astraweb.com>

On Mon, 08 Mar 2010 16:09:12 +1300, Gregory Ewing wrote:

> Given some known data/crc pairs, how feasible is it to figure out the
> polynomial being used to generate the crc?

Can you just ask the application developer what CRC is being used? Or 
look at the source code? Disassemble the binary?


> In the case I'm looking at, it appears that the crc size may be at least
> 24 bits, so just trying all possible polynomials probably isn't doable.

"At least"? Can't you tell by looking at them?

A good place to start is here:

http://en.wikipedia.org/wiki/Cyclic_redundancy_check
http://en.wikipedia.org/wiki/List_of_checksum_algorithms

You can at least eliminate known CRCs. There doesn't appear to be any 24-
bit CRCs in common use, and very few other 24-bit checksums either, so 
you're probably looking at a custom CRC.

 
> An article I found hints at the possibility of using GCDs to make the
> search more efficient, but doesn't go into any details. Anyone know of
> any literature about this?

If you're reduced to trying to determine the polynomial from a sample of 
checksums, that's a curve fitting problem. There are various ways to fit 
polynomials through a set of known points, but as far as I know none of 
them are designed for reverse-engineering CRCs.

You may be able to find something about curve-fitting using discrete 
maths (i.e. where all values are limited to integers) or with constraints.

You should probably take this to somewhere like sci.crypt. Here's a 
thread from a few years back which might give you some hints:

http://www.derkeiler.com/Newsgroups/sci.crypt/2008-07/msg00035.html

Or here:

http://stackoverflow.com/questions/401231/determining-crc-algorithm-from-
data-crc-embedded-application


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sun Mar  7 22:44:24 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 08 Mar 2010 03:44:24 GMT
Subject: Reverse engineering CRC?
References: <7vj7fdFnnjU1@mid.individual.net>
Message-ID: <4b947298$0$8836$c3e8da3@news.astraweb.com>

On Mon, 08 Mar 2010 16:09:12 +1300, Gregory Ewing wrote:

> Given some known data/crc pairs, how feasible is it to figure out the
> polynomial being used to generate the crc?

Google is your friend:

http://www.woodmann.com/fravia/crctut1.htm



-- 
Steven


From satishgroups1 at gmail.com  Sun Mar  7 23:43:09 2010
From: satishgroups1 at gmail.com (satish groups)
Date: Sun, 7 Mar 2010 20:43:09 -0800 (PST)
Subject: Evaluating Income Property
Message-ID: <3b8d2ac9-5e77-4910-9774-203cf1c6cd29@s25g2000prd.googlegroups.com>

Income property is becoming more attractive to investors looking for a
better return on their money. With today's low interest rates, income-
producing properties such as apartments and duplexes can produce
exciting returns. As with any type of property, the value of income
property is what someone is willing to pay for it. But, the main
determinant of value for income property is the net income it will
produce.

As we'll see later, the income approach should closely correlate with
the market value under normal market conditions. Buyers of residential
income property will want to know the answers to several questions not
normally asked by home buyers. First, what is the amount of cash flow
the property will generate? Second, how much actual net income will it
produce? Third, are the tax benefits that the property will provide
the investor? Cash flow can be described as the amount of money
collected as rental income each month.

http://greatincomeproperties.com/


From dr.cg at 126.com  Mon Mar  8 00:08:56 2010
From: dr.cg at 126.com (CHEN Guang)
Date: Mon, 8 Mar 2010 13:08:56 +0800 (CST)
Subject: The C language like the Python, by the Python and for the Python
	--- PythoidC
Message-ID: <1f91f2e.86f9.1273c2d0993.Coremail.dr.cg@126.com>

Hi, if you are interested in C-Python mixed programming, please take a look at:
http://pythoidc.googlecode.com
PythoidC is the C language like the Python, by the Python and for the Python
 
import c
c.include(c.h.stdio) 
c.include(c.h.stdlib) 
'''Annotation is free!''' 
int fib(int n): 
    if(n<=2): 
        return1 
    else: 
        return fib(n-1)+ fib(n-2) 
int main(int argc,char**argv): 
    int n //C style annotation 
    n=c.stdlib.atoi(argv[1]) 
    c.stdio.printf('fibonacci(%d)=%d\n', n, fib(n))
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From python at rcn.com  Mon Mar  8 01:31:00 2010
From: python at rcn.com (Raymond Hettinger)
Date: Sun, 7 Mar 2010 22:31:00 -0800 (PST)
Subject: negative "counts" in collections.Counter?
References: <mailman.437.1267995887.23598.python-list@python.org> 
	<m2eijv4vtk.fsf@googlemail.com>
	<4b9456f4$0$8836$c3e8da3@news.astraweb.com>
Message-ID: <e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com>

On Mar 7, 5:46?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> Given that Counter supports negative counts, it looks to me that the
> behaviour of __add__ and __sub__ is fundamentally flawed. You should
> raise a bug report (feature enhancement) on the bug tracker.

It isn't a bug.  I designed it that way.
There were several possible design choices,
each benefitting different use cases.

FWIW, here is the reasoning behind the design.

The basic approach to Counter() is to be a dict subclass
that supplies zero for missing values.   This approach
places almost no restrictions on what can be stored in it.
You can store floats, decimals, fractions, etc.
Numbers can be positive, negative, or zero.

This design leaves users with a good deal of flexibility,
but more importantly it keeps the API very close to
regular dictionaries (thus lowering the learning curve).
It also makes basic counter operations very fast.

The update() method differs from regular dictionaries
because dict.update() isn't very helpful in a counter context.
Instead, it allows one counter to update another.  Like
the other basic counter operations, it places no restrictions
on type (i.e.  it works on with ints, floats, decimals, fractions,
etc).
or on sign (positive, negative, or zero).  The only requirement
is that the values support addition.

The basic API also adds some convenience methods.
The most_common() method tries to not be restrictive.
It only requires the count values be orderable.

For obvious reasons, the elements() method *does* have
restrictions and won't work with float values and won't
emit entries with non-positive counts.

Beyond the basic API listed above which is straight-forward,
the area where there were more interesting design choices
were the Counter-to-Counter operations (__add__, __sub__,
__or__, and __and__).

One possible choice (the one preferred by the OP) was to
has addition and subtraction be straight adds and subtracts
without respect to sign and to not support __and__ and __or__.
Straight addition was already supported via the update() method.
But no direct support was provided for straight subtractions
that leave negative values.  Sorry about that.

Instead the choice was to implement the four methods as
multiset operations.  As such, they need to correspond
to regular set operations.  For example, with sets:

   set('abc') - set('cde')    # gives set('ab')

Notice how subtracting 'e' did not produce a negative result?
Now with multisets, we want the same result:

   Counter({'a':1, 'b':1, 'c':1'}) - Counter({'c':1, 'd':1, 'e':1})

So the design decision was to support multiset operations
that produces only results with positive counts.

These multiset-style mathematical operations are discussed in:
Knuth's TAOCP Volume II section 4.6.3 exercise 19
and at http://en.wikipedia.org/wiki/Multiset .
Also C++ has multisets that support only positive counts.

So, there you have it.  There design tries to be as
unrestrictive as possible.  When a choice had to be
made, it favored multisets over behaviors supporting
negative values.

Fortunately, it is trivially easy to extend the class
to add any behavior you want.

class MyCounter(Counter):
   def __sub__(self, other):
      result = self.copy()
      for elem, cnt in other.items():
          result[elem] -= cnt

Hopes this gives you some insight into the design choices.


Raymond Hettinger



From stefan_ml at behnel.de  Mon Mar  8 02:08:35 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Mon, 08 Mar 2010 08:08:35 +0100
Subject: The C language like the Python, by the Python and for the Python
	--- PythoidC
In-Reply-To: <1f91f2e.86f9.1273c2d0993.Coremail.dr.cg@126.com>
References: <1f91f2e.86f9.1273c2d0993.Coremail.dr.cg@126.com>
Message-ID: <hn27pj$cen$1@dough.gmane.org>

CHEN Guang, 08.03.2010 06:08:
> Hi, if you are interested in C-Python mixed programming, please take a look at:
> http://pythoidc.googlecode.com
> PythoidC is the C language like the Python, by the Python and for the Python

It looks a bit dangerous to me to parse C header files only with regular 
expressions. For Cython, some people seem to be using gcc-xml instead, and 
some have reported that clang is really nice to play with. However, none of 
those has made its way into Cython yet, mostly due to the dependency it 
would add. I don't know if tcc (which you seem to depend on) has anything 
comparable, but I doubt it.

Just out of curiosity, is this syntax converter actually used for any real 
projects?

Stefan



From miraclesoul at hotmail.com  Mon Mar  8 02:15:18 2010
From: miraclesoul at hotmail.com (Fahad Ahmad)
Date: Mon, 8 Mar 2010 07:15:18 +0000
Subject: Calculating very large exponents in python
In-Reply-To: <f3cc57c61003071240x18b580bend946824ef7955b6c@mail.gmail.com>
References: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>,
	<f3cc57c61003071240x18b580bend946824ef7955b6c@mail.gmail.com>
Message-ID: <COL110-W1236CED756D3C9374CB0A2B7350@phx.gbl>


Thanks Geremy,

That has been an absolute bump........... GOD i cant sit on my chair, it has worked even on 512 bit number and with no time..........
superb i would say.

lastly, i am using the code below to calculate Largest Prime factor of a number:

print ('''==============================================================================='''
       '''              CALCULATE  HIGHEST PRIME FACTOR                                  '''
       '''===============================================================================''')

#!/usr/bin/env python
def highest_prime_factor(n):
   if isprime(n):
      return n
   for x in xrange(2,n ** 0.5 + 1):
      if not n % x:
         return highest_prime_factor(n/x)
def isprime(n):
   for x in xrange(2,n ** 0.5 + 1):
      if not n % x:
         return False
   return True
if  __name__ == "__main__":
   import time
   start = time.time()
   print highest_prime_factor(1238162376372637826)
   print time.time() - start

the code works with a bit of delay on the number : "1238162376372637826" but extending it to (109026109913291424366305511581086089650628117463925776754560048454991130443047109026109913291424366305511581086089650628117463925776754560048454991130443047)
 makes python go crazy. Is there any way just like above, i can have it calculated it in no time.


thanks for the support.




> Date: Sun, 7 Mar 2010 15:40:59 -0500
> Subject: Re: Calculating very large exponents in python
> From: debatem1 at gmail.com
> To: miraclesoul at hotmail.com
> CC: python-list at python.org
> 
> On Sun, Mar 7, 2010 at 1:55 PM, Fahad Ahmad <miraclesoul at hotmail.com> wrote:
> > Dear All,
> >
> > i am writing my crytographic scheme in python, i am just a new user to it.
> > I have written the complete code, the only point i am stuck it is that i am
> > using 256 exponentiation which is normal in crytography but python just
> > hangs on it.
> >
> > g**x  [where both g and x are 256 bit numbers , in decimal they are around
> > 77]
> >
> > after reading several forums, i just come to know it can be done using
> > numpy, i have installed python(x,y) has has both numpy and scipy installed
> > but i am not able to make it happen.
> >
> > any idea which library, module, or piece of code can solve this mystery :S
> >
> > sorry for bad english
> 
> A couple of things:
> 
> 1) if you're working with modular exponentiation, remember that pow() takes
> three arguments, ie:
> 
> a = 222222222222222222222222222
> b = 5555555555555555555555555555
> pow(a, b, 1200)
> 
> will calculate the correct answer (768) very quickly, while
> 
> a**b % 1200
> 
> has not terminated in the time it took me to compose this
> email.
> 
> 2) sage has a lot of excellent tools for crypto/cryptanalysis that you
> may want to take a look at.
> 
> 3) not saying you don't know what you're doing, but be careful when
> rolling your own cryptosystems- even very good cryptographers make
> implementation mistakes!
> 
> Geremy Condra
 		 	   		  
_________________________________________________________________
Hotmail: Powerful Free email with security by Microsoft.
http://clk.atdmt.com/GBL/go/201469230/direct/01/
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From alfps at start.no  Mon Mar  8 02:38:55 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Mon, 08 Mar 2010 08:38:55 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.439.1268013689.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>	<hmn03d$5r6$1@news.eternal-september.org>	<mailman.292.1267717742.23598.python-list@python.org>	<hmooo6$pg0$1@news.eternal-september.org>	<mailman.300.1267723245.23598.python-list@python.org>	<hmoul7$2i9$1@news.eternal-september.org>	<mailman.314.1267744631.23598.python-list@python.org>	<hmph3b$20o$1@news.eternal-september.org>
	<mailman.439.1268013689.23598.python-list@python.org>
Message-ID: <hn29il$sbv$1@news.eternal-september.org>

* Gabriel Genellina:
> En Thu, 04 Mar 2010 20:52:04 -0300, Alf P. Steinbach <alfps at start.no> 
> escribi?:
> 
>> Sorry, as with the places noted above, I can't understand what you're 
>> trying to say here.
> 
> Regarding your posts, neither can I. All the time. Sorry, deciphering 
> your posts would force me to spend much more time than available and I 
> can't afford that - so I'm blocking your messages from now on.


You could just ask if there was anything you didn't understand.

Even with as little you quote readers can see my approach to that problem: asking.

But your response, both the out of context quoting and your comment, seems 
solely designed to convey a negative impression instead of addressing any 
technical issue.


Cheers,

- Alf


From stefan_ml at behnel.de  Mon Mar  8 02:42:38 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Mon, 08 Mar 2010 08:42:38 +0100
Subject: running a program on many processors
In-Reply-To: <hn1m73$9g7$1@news.eternal-september.org>
References: <hn1ft2$i5l$1@atlantis.news.neostrada.pl>
	<hn1m73$9g7$1@news.eternal-september.org>
Message-ID: <hn29pe$h67$1@dough.gmane.org>

Martin P. Hellwig, 08.03.2010 03:08:
> I did read, two years or so ago, that AMD was looking in to something
> that does just what you say on a cpu level, that is present itself as
> one logical cpu but underneath there are multiple physical ones. I
> wouldn't hold my breath though waiting for it.

Many (desktop/server) CPUs actually do the opposite today - they present 
themselves as one physical CPU per core with more than one (commonly two) 
logical CPUs. This was introduced because modern CPUs have so many 
independent parts (integer arithmetic, floating point, SSE, memory access) 
that it's hard to keep all of them busy with a single process (which 
usually does either integer arithmetic *or* floating point, for example, 
rarely both in parallel). With multiple processes running on the same core, 
it becomes a lot easier to find independent operations that can be sent to 
different parts of the core in parallel.

Automatically splitting single-threaded code over multiple cores is 
something that compilers (that see the full source code) should be able to 
do a lot better than hardware (which only sees a couple of basic operations 
at a time).

http://en.wikipedia.org/wiki/Vectorization_%28computer_science%29

Expecting this to work for an interpreted Python program is somewhat 
unrealistic, IMHO. If you need data parallel execution, use something like 
map-reduce or Copperhead instead of relying on the CPU to figure out what's 
happening inside of a virtual machine.

http://fperez.org/py4science/ucb/talks/20091118_copperhead_bcatanzaro.pdf

Stefan



From taskinoor.hasan at csebuet.org  Mon Mar  8 02:48:00 2010
From: taskinoor.hasan at csebuet.org (Taskinoor Hasan)
Date: Mon, 8 Mar 2010 13:48:00 +0600
Subject: Calculating very large exponents in python
In-Reply-To: <COL110-W1236CED756D3C9374CB0A2B7350@phx.gbl>
References: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>
	<f3cc57c61003071240x18b580bend946824ef7955b6c@mail.gmail.com>
	<COL110-W1236CED756D3C9374CB0A2B7350@phx.gbl>
Message-ID: <79153a2e1003072348r16fd4427i7ea2b3fbdd626c91@mail.gmail.com>

First of all, you simply can't use this straight approach of primality
testing for very very big numbers. There are a number of algorithms, both
deterministic and random. Please Google for them (and don't forget to check
Wikipedia too). Study the random algorithms to check whether they can be
applied in your situation, since they are faster.

And another implementation issue. Try to avoid many recursive calls. It's
always possible to convert a recursive function to a non-recursive one and
that will be faster if your recursion is too long.

Hope it helps.

Regards
Taskinoor Hasan (Sajid)

On Mon, Mar 8, 2010 at 1:15 PM, Fahad Ahmad <miraclesoul at hotmail.com> wrote:

>  Thanks Geremy,
>
> That has been an absolute bump........... GOD i cant sit on my chair, it
> has worked even on 512 bit number and with no time..........
> superb i would say.
>
> lastly, i am using the code below to calculate Largest Prime factor of a
> number:
>
> print
> ('''==============================================================================='''
>        '''              CALCULATE  HIGHEST PRIME
> FACTOR                                  '''
>
> '''===============================================================================''')
>
> #!/usr/bin/env python
> def highest_prime_factor(n):
>    if isprime(n):
>       return n
>    for x in xrange(2,n ** 0.5 + 1):
>       if not n % x:
>          return highest_prime_factor(n/x)
> def isprime(n):
>    for x in xrange(2,n ** 0.5 + 1):
>       if not n % x:
>          return False
>    return True
> if  __name__ == "__main__":
>    import time
>    start = time.time()
>    print highest_prime_factor(1238162376372637826)
>    print time.time() - start
>
> the code works with a bit of delay on the number : "1238162376372637826"
> but extending it to
> (109026109913291424366305511581086089650628117463925776754560048454991130443047109026109913291424366305511581086089650628117463925776754560048454991130443047)
>  makes python go crazy. Is there any way just like above, i can have it
> calculated it in no time.
>
>
> thanks for the support.
>
>
>
>
> > Date: Sun, 7 Mar 2010 15:40:59 -0500
> > Subject: Re: Calculating very large exponents in python
> > From: debatem1 at gmail.com
> > To: miraclesoul at hotmail.com
> > CC: python-list at python.org
>
> >
> > On Sun, Mar 7, 2010 at 1:55 PM, Fahad Ahmad <miraclesoul at hotmail.com>
> wrote:
> > > Dear All,
> > >
> > > i am writing my crytographic scheme in python, i am just a new user to
> it.
> > > I have written the complete code, the only point i am stuck it is that
> i am
> > > using 256 exponentiation which is normal in crytography but python just
> > > hangs on it.
> > >
> > > g**x  [where both g and x are 256 bit numbers , in decimal they are
> around
> > > 77]
> > >
> > > after reading several forums, i just come to know it can be done using
> > > numpy, i have installed python(x,y) has has both numpy and scipy
> installed
> > > but i am not able to make it happen.
> > >
> > > any idea which library, module, or piece of code can solve this mystery
> :S
> > >
> > > sorry for bad english
> >
> > A couple of things:
> >
> > 1) if you're working with modular exponentiation, remember that pow()
> takes
> > three arguments, ie:
> >
> > a = 222222222222222222222222222
> > b = 5555555555555555555555555555
> > pow(a, b, 1200)
> >
> > will calculate the correct answer (768) very quickly, while
> >
> > a**b % 1200
> >
> > has not terminated in the time it took me to compose this
> > email.
> >
> > 2) sage has a lot of excellent tools for crypto/cryptanalysis that you
> > may want to take a look at.
> >
> > 3) not saying you don't know what you're doing, but be careful when
> > rolling your own cryptosystems- even very good cryptographers make
> > implementation mistakes!
> >
> > Geremy Condra
>
> ------------------------------
> Hotmail: Powerful Free email with security by Microsoft. Get it now.<http://clk.atdmt.com/GBL/go/201469230/direct/01/>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From dr.cg at 126.com  Mon Mar  8 03:49:15 2010
From: dr.cg at 126.com (CHEN Guang)
Date: Mon, 8 Mar 2010 16:49:15 +0800 (CST)
Subject: The C language like the Python, by the Python and for the
	Python--- PythoidC
In-Reply-To: <mailman.2684.1268034483.23597.python-list@python.org>
References: <mailman.2684.1268034483.23597.python-list@python.org>
Message-ID: <195722f.da8d.1273cf6bb23.Coremail.dr.cg@126.com>

Dear Stefan, 
Thanks a lot for your interest in PythoidC.
Yes, PythoidC takes regular expression to parse C header files, 
but there is no danger at all, because, the parsed result is only used for 
introspecting and auto-completion, has noting to do with syntax converting and compiling.
I just improved PythoidC to a satisfying version for me, up to now, all the projects
with PythoidC are experimental or educational.
PythoidC is mainly used to deal with simple but time consuming tasks in Python project, 
as you see, PythoidC file can be imported the same any Python files.
Oliver ( ChenGuang )
?
CHEN Guang, 08.03.2010 06:08:
> Hi, if you are interested in C-Python mixed programming, please take a look at:
> http://pythoidc.googlecode.com
> PythoidC is the C language like the Python, by the Python and for the Python

It looks a bit dangerous to me to parse C header files only with regular 
expressions. For Cython, some people seem to be using gcc-xml instead, and 
some have reported that clang is really nice to play with. However, none of 
those has made its way into Cython yet, mostly due to the dependency it 
would add. I don't know if tcc (which you seem to depend on) has anything 
comparable, but I doubt it.

Just out of curiosity, is this syntax converter actually used for any real 
projects?

Stefan
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From bruno.42.desthuilliers at websiteburo.invalid  Mon Mar  8 03:53:47 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Mon, 08 Mar 2010 09:53:47 +0100
Subject: isinstance(False, int)
In-Reply-To: <mailman.370.1267815705.23598.python-list@python.org>
References: <mailman.357.1267809307.23598.python-list@python.org>
	<m2aaum1w8q.fsf@googlemail.com> <hmrinv$ftq$1@dough.gmane.org>
	<mailman.370.1267815705.23598.python-list@python.org>
Message-ID: <4b94baf3$0$20649$426a74cc@news.free.fr>

Rolando Espinoza La Fuente a ?crit :
> On Fri, Mar 5, 2010 at 2:32 PM, mk <mrkafk at gmail.com> wrote:
>> Arnaud Delobelle wrote:
>>
>>>>>> 1 == True
>>> True
>>>>>> 0 == False
>>> True
>>>
>>> So what's your question?
>> Well nothing I'm just kind of bewildered: I'd expect smth like that in Perl,
>> but not in Python.. Although I can understand the rationale after skimming
>> PEP 285, I still don't like it very much.
>>
> 
> So, the pythonic way to check for True/False should be:
> 
>>>> 1 is True
> False
> 
>>>> 0 is False
> False
> 
> instead of ==, right?

Nope. The pythonic way is to check for truth value - not for True or 
False -, and to only use the identity test when wanting to test for 
identity.



From fox.joe87 at gmail.com  Mon Mar  8 03:59:14 2010
From: fox.joe87 at gmail.com (Mahesh)
Date: Mon, 8 Mar 2010 00:59:14 -0800 (PST)
Subject: libc Sleep api performs a busy waiting
Message-ID: <a52b97c0-7266-4bc6-9ab4-3a8688120a6c@u19g2000prh.googlegroups.com>

Hi,

 I am having a problem while using sleep function from libc , the
thread in which i am calling it is getting struck and not allowing
other threads to execute.  Here is a simple code that i am trying to
exeute

import threading
import time
import dl


def dummy1():
    a=dl.open('/lib/libc.so.6')
    print "in thread 1 Start"
    a.call('sleep',2)
    #time.sleep(2)
    print "in thread 1 End"

def dummy2():
    print "in thread 2 Start"
    time.sleep(1)
    print "in thread 2 End"
newThread1=threading.Thread(None,dummy1)
newThread2=threading.Thread(None,dummy2)
newThread1.start()
newThread2.start()

print "in main"



The out put of this program is  (In this case thread 1 even though i
am calling a sleep function its not allowing other threads to execute,
other threads execute only after the completion of first thread)

in thread 1 Start
in thread 1 End
in thread 2 Start
in main
in thread 2 End


where as if i use time.sleep instead of a.call(sleep) the out put is
(which i guess is right behaviour, because it start the threads and
suspends them because the have sleep , and continue executing the main
thread)
in thread 1 Start
in thread 2 Start
in main
in thread 2 End
in thread 1 End




From processor.dev1l at gmail.com  Mon Mar  8 04:26:58 2010
From: processor.dev1l at gmail.com (Processor-Dev1l)
Date: Mon, 8 Mar 2010 01:26:58 -0800 (PST)
Subject: running a program on many processors
References: <hn1ft2$i5l$1@atlantis.news.neostrada.pl>
Message-ID: <112ea184-1e81-45aa-b5ed-73d6ded7a460@d2g2000yqa.googlegroups.com>

On Mar 8, 1:18?am, Pawe? Bany? <moc.li... at synabp.reverse_the_string>
wrote:
> Hello,
>
> I have already read about Python and multiprocessing which allows using
> many processors. The idea is to split a program into separate tasks and
> run each of them on a separate processor. However I want to run a Python
> program doing a single simple task on many processors so that their
> cumulative power is available to the program as if there was one huge
> CPU instead of many separate ones. Is it possible? How can it be achieved?
>
> Best regards,
>
> Pawe?

I can suggest you to try some .NET language (like c#, Boo <-- python-
like, or maybe even IronPython). Reason is that .NET languages do
analyze the code and split them into logical parts that run across
threads.


From fox.joe87 at gmail.com  Mon Mar  8 04:30:45 2010
From: fox.joe87 at gmail.com (Joe Fox)
Date: Mon, 8 Mar 2010 15:00:45 +0530
Subject: libc Sleep api performs a busy waiting
Message-ID: <27e52ad11003080130v7664d951p3ba92bd692efe0ad@mail.gmail.com>

Hi ,

 I am having a problem while using sleep function from libc , the
thread in which i am calling it is getting struck and not allowing
other threads to execute.  Here is a simple code that i am trying to
exeute

import threading
import time
import dl

def dummy1():
    a=dl.open('/lib/libc.so.6')
    print "in thread 1 Start"
    a.call('sleep',2)
    #time.sleep(2)
    print "in thread 1 End"

def dummy2():
    print "in thread 2 Start"
    time.sleep(1)
    print "in thread 2 End"
newThread1=threading.Thread(None,dummy1)
newThread2=threading.Thread(None,dummy2)
newThread1.start()
newThread2.start()

print "in main"

The out put of this program is  (In this case thread 1 even though i
am calling a sleep function its not allowing other threads to execute,
other threads execute only after the completion of first thread)

in thread 1 Start
in thread 1 End
in thread 2 Start
in main
in thread 2 End
where as if i use time.sleep instead of a.call(sleep) the out put is
(which i guess is right behaviour, because it start the threads and
suspends them because the have sleep , and continue executing the main
thread)
in thread 1 Start
in thread 2 Start
in main
in thread 2 End
in thread 1 End


Can any of you point me how to over come this.?
Thanks
Mahesh
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From davea at ieee.org  Mon Mar  8 05:13:09 2010
From: davea at ieee.org (Dave Angel)
Date: Mon, 08 Mar 2010 05:13:09 -0500
Subject: Reverse engineering CRC?
In-Reply-To: <4b947298$0$8836$c3e8da3@news.astraweb.com>
References: <7vj7fdFnnjU1@mid.individual.net>
	<4b947298$0$8836$c3e8da3@news.astraweb.com>
Message-ID: <4B94CDB5.9010506@ieee.org>

Steven D'Aprano wrote:
> On Mon, 08 Mar 2010 16:09:12 +1300, Gregory Ewing wrote:
>
>   
>> Given some known data/crc pairs, how feasible is it to figure out the
>> polynomial being used to generate the crc?
>>     
>
> Google is your friend:
>
> http://www.woodmann.com/fravia/crctut1.htm
>
>   
That page was interesting to read, especially since I've implemented the 
three algorithms - CRC16, CRC32, and the reversed version of CRC16, all 
in the long-distant past.

However, if there's anything in there about how to derive the polynomial 
algorithm from (a few) samples I missed it entirely. Instead, what it 
calls reverse engineering is figuring out how to modify a message to 
force it to have a desired CRC value (when the CRC polynomial is already 
known).

DaveA



From mail at timgolden.me.uk  Mon Mar  8 05:38:52 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Mon, 08 Mar 2010 10:38:52 +0000
Subject: Best practice way to detect internet connectivity under Python
	2.6/Windows
In-Reply-To: <1268016090.13219.1363604225@webmail.messagingengine.com>
References: <1268016090.13219.1363604225@webmail.messagingengine.com>
Message-ID: <4B94D3BC.8040808@timgolden.me.uk>

On 08/03/2010 02:41, python at bdurham.com wrote:
> Is the best pratice way to detect internet connectivity under
> Windows (using Python 2.6) simply to attempt to access a known
> internet website using urllib or urlib2 wrapped in a try/except
> construct?

Well, in theory you could use the Internet API:

   http://msdn.microsoft.com/en-us/library/aa383996%28VS.85%29.aspx

which is exposed via the win32inet module:

   http://timgolden.me.uk/pywin32-docs/win32inet.html

but I'd just do a socket connection to port 80 (or some known port
on some known server)  with a reasonable timeout.

TJG


From fetchinson at googlemail.com  Mon Mar  8 05:53:25 2010
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Mon, 8 Mar 2010 11:53:25 +0100
Subject: Curiosity stirkes me on 'import this'.
In-Reply-To: <2d56febf1003070159o5346701ema0ba72a43066ace2@mail.gmail.com>
References: <2d56febf1003070159o5346701ema0ba72a43066ace2@mail.gmail.com>
Message-ID: <fbe2e2101003080253n683676d4veb0aceab732d1725@mail.gmail.com>

> I took a look at the 'this' module to see where the file is stored. This is
> probably old news to some people, but was new to me.
>
> print this.s
> Gur Mra bs Clguba, ol Gvz Crgref
>
> Ornhgvshy vf orggre guna htyl.
> Rkcyvpvg vf orggre guna vzcyvpvg.
> Fvzcyr vf orggre guna pbzcyrk.
> Pbzcyrk vf orggre guna pbzcyvpngrq.
> Syng vf orggre guna arfgrq.
> Fcnefr vf orggre guna qrafr.
> Ernqnovyvgl pbhagf.
> Fcrpvny pnfrf nera'g fcrpvny rabhtu gb oernx gur ehyrf.
> Nygubhtu cenpgvpnyvgl orngf chevgl.
> Reebef fubhyq arire cnff fvyragyl.
> Hayrff rkcyvpvgyl fvyraprq.
> Va gur snpr bs nzovthvgl, ershfr gur grzcgngvba gb thrff.
> Gurer fubhyq or bar-- naq cersrenoyl bayl bar --boivbhf jnl gb qb vg.
> Nygubhtu gung jnl znl abg or boivbhf ng svefg hayrff lbh'er Qhgpu.
> Abj vf orggre guna arire.
> Nygubhtu arire vf bsgra orggre guna *evtug* abj.
> Vs gur vzcyrzragngvba vf uneq gb rkcynva, vg'f n onq vqrn.
> Vs gur vzcyrzragngvba vf rnfl gb rkcynva, vg znl or n tbbq vqrn.
> Anzrfcnprf ner bar ubaxvat terng vqrn -- yrg'f qb zber bs gubfr!
>
> And some other attributes in 'this' module as well, that decodes the string.
> I'm curious. Was this encoded purely for fun?

Yes.

Cheers,
Daniel




-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From greg.ewing at canterbury.ac.nz  Mon Mar  8 06:06:36 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Tue, 09 Mar 2010 00:06:36 +1300
Subject: Reverse engineering CRC?
In-Reply-To: <4b9471ee$0$8836$c3e8da3@news.astraweb.com>
References: <7vj7fdFnnjU1@mid.individual.net>
	<4b9471ee$0$8836$c3e8da3@news.astraweb.com>
Message-ID: <7vk3eiFtivU1@mid.individual.net>

Steven D'Aprano wrote:

> Can you just ask the application developer what CRC is being used? Or 
> look at the source code? Disassemble the binary?

There's no source, and the binary is enormous. I could ask,
but I wouldn't hold out much hope of them being willing to
tell me.

>>it appears that the crc size may be at least
>>24 bits, so just trying all possible polynomials probably isn't doable.
> 
> "At least"? Can't you tell by looking at them?

It's not entirely clear exactly which bytes are part of the
CRC. There are 3 adjacent bytes in the header of the file
that change when I modify the contents, which led me to
think it was a 24-bit CRC. But I now believe that one of
them is not part of the CRC, and it's actually 16 bits.

Using pycrc, I've now tried all possible 16-bit polynomials,
with various combinations of bit and byte reversal, but I
haven't found one that works consistently, so I'm wondering
whether it's using some non-standard algorithm.

-- 
Greg


From vlastimil.brom at gmail.com  Mon Mar  8 06:13:31 2010
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Mon, 8 Mar 2010 12:13:31 +0100
Subject: negative "counts" in collections.Counter?
In-Reply-To: <e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com>
References: <mailman.437.1267995887.23598.python-list@python.org>
	<m2eijv4vtk.fsf@googlemail.com>
	<4b9456f4$0$8836$c3e8da3@news.astraweb.com>
	<e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com>
Message-ID: <9fdb569a1003080313mf6c8d9cr932678c11c4e80e4@mail.gmail.com>

2010/3/8 Raymond Hettinger <python at rcn.com>:
> On Mar 7, 5:46?pm, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
>> Given that Counter supports negative counts, it looks to me that the
>> behaviour of __add__ and __sub__ is fundamentally flawed. You should
>> raise a bug report (feature enhancement) on the bug tracker.
>
> It isn't a bug. ?I designed it that way.
> There were several possible design choices,
> each benefitting different use cases.
>...
> One possible choice (the one preferred by the OP) was to
> has addition and subtraction be straight adds and subtracts
> without respect to sign and to not support __and__ and __or__.
> Straight addition was already supported via the update() method.
> But no direct support was provided for straight subtractions
> that leave negative values. ?Sorry about that.
>
> Instead the choice was to implement the four methods as
> multiset operations. ?As such, they need to correspond
> to regular set operations. ?For example, with sets:
>
>...
> Hopes this gives you some insight into the design choices.
>
>
> Raymond Hettinger
>
Thank you very much for the exhaustive explanation Raymond!
I very much suspected, there would be some exact reasoning behind it,
as these negative counts are explicitly handled in the code of these
methods.
I just happened to expect the straightforward addition and subtraction
and possibly the zero truncation or an exception in incompatible cases
(like elements() with floats, currently). This way also the negative
part would be available and the truncation possible.
I am by far not able to follow all of the mathematical background, but
even for zero-truncating multiset, I would expect the truncation on
input rather than on output of some operations. E.g. the following
seems surprising to me in context of the discarded negatives by
addition or subtraction:

>>> c1=collections.Counter({'a': -11, 'b': -8})
>>> c2=collections.Counter({'a': 3})
>>> c2-c1
Counter({'a': 14, 'b': 8})
>>>

Probably a kind of negative_update()  or some better named method will
be handy, like the one you supplied or simply the current module code
without the newcount > 0: ... condition. Or would it be an option to
have a keyword argument like zero_truncate=False which would influence
this behaviour? Or is some other method than elements() incompatible
with negative counts?
(I actually can imagine comparing negative counts on both sides. e.g.
in a secondary comparison of two wordlists with specific removed items
- comparing to the "master" list.)
Additionally, were issubset and issuperset considered for this
interface (not sure whether symmetric_difference would be applicable)?

Anyway, I recognise, that I can easily use a custom class for these
tasks, if these usecases are rare or non-standard for this general
collection object.
Thanks again,
  vbr


From kshipras at packtpub.com  Mon Mar  8 06:25:07 2010
From: kshipras at packtpub.com (Kshipra Singh)
Date: Mon, 8 Mar 2010 16:55:07 +0530
Subject: Opportunity to author Python books- Packt Publishing. 
Message-ID: <B9C59EAAF7F14FF98A361596DD5525B4@sonyPC>

Hi All,

I am writing to you for Packt Publishing, the publishers computer related books.

We are planning to extend our catalogue of cookbooks and are currently inviting "Python" fanatics interested in writing a cookbook. So, if you love "Python" and are interested in writing a cookbook, please contact us with your book ideas at author at packtpub.com. Even if you do not have a book idea and are simply interested in authoring a cookbook, we are keen to hear from you. 

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Kshipra Singh
Author Relationship Manager
Packt Publishing
www.PacktPub.com
 
Skype: kshiprasingh15
Twitter: http://twitter.com/kshipras
 
Interested in becoming an author? Visit http://authors.packtpub.com for all the information you need about writing for Packt.
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From ben+python at benfinney.id.au  Mon Mar  8 06:34:11 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Mon, 08 Mar 2010 22:34:11 +1100
Subject: Curiosity stirkes me on 'import this'.
References: <2d56febf1003070159o5346701ema0ba72a43066ace2@mail.gmail.com>
	<mailman.454.1268045612.23598.python-list@python.org>
Message-ID: <871vfv11zg.fsf@benfinney.id.au>

Daniel Fetchinson <fetchinson at googlemail.com> writes:

> > I'm curious. Was this encoded purely for fun?
>
> Yes.

For some more fun, try measuring the ?this? module source code against
the principles in the Zen.

-- 
 \                 ?Leave nothing to chance. Overlook nothing. Combine |
  `\          contradictory observations. Allow yourself enough time.? |
_o__)                                                     ?Hippocrates |
Ben Finney


From steve at REMOVE-THIS-cybersource.com.au  Mon Mar  8 07:21:18 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 08 Mar 2010 12:21:18 GMT
Subject: negative "counts" in collections.Counter?
References: <mailman.437.1267995887.23598.python-list@python.org>
	<m2eijv4vtk.fsf@googlemail.com>
	<4b9456f4$0$8836$c3e8da3@news.astraweb.com>
	<e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com>
Message-ID: <4b94ebbd$0$8762$c3e8da3@news.astraweb.com>

On Sun, 07 Mar 2010 22:31:00 -0800, Raymond Hettinger wrote:

> On Mar 7, 5:46?pm, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
>> Given that Counter supports negative counts, it looks to me that the
>> behaviour of __add__ and __sub__ is fundamentally flawed. You should
>> raise a bug report (feature enhancement) on the bug tracker.
> 
> It isn't a bug.  I designed it that way. There were several possible
> design choices, each benefitting different use cases.

Thanks for the explanation Raymond. A few comments follow:


> FWIW, here is the reasoning behind the design.
> 
> The basic approach to Counter() is to be a dict subclass that supplies
> zero for missing values.   This approach places almost no restrictions
> on what can be stored in it. You can store floats, decimals, fractions,
> etc. Numbers can be positive, negative, or zero.

Another way of using default values in a dict. That's five that I know 
of: dict.get, dict.setdefault, dict.pop, collections.defaultdict, and 
collections.Counter. And the Perl people criticise Python for having 
"only one way to do it" *wink*

(That's not meant as a criticism, merely an observation.)


[...]
> One possible choice (the one preferred by the OP) was to has addition
> and subtraction be straight adds and subtracts without respect to sign
> and to not support __and__ and __or__. Straight addition was already
> supported via the update() method. But no direct support was provided
> for straight subtractions that leave negative values.  Sorry about that.

Would you consider a feature enhancement adding an additional method, 
analogous to update(), to perform subtractions? I recognise that it's 
easy to subclass and do it yourself, but there does seem to be some 
demand for it, and it is an obvious feature given that Counter does 
support negative counts.


> Instead the choice was to implement the four methods as multiset
> operations.  As such, they need to correspond to regular set operations.

Personally, I think the behaviour of + and - would be far less surprising 
if the class was called Multiset. Intuitively, one would expect counters 
to be limited to ints, and to support negative counts when adding and 
subtracting. In hindsight, do you think that Multiset would have been a 
better name?



-- 
Steven


From steve at holdenweb.com  Mon Mar  8 07:28:06 2010
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 08 Mar 2010 07:28:06 -0500
Subject: A "scopeguard" for Python
In-Reply-To: <hn29il$sbv$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>	<hmn03d$5r6$1@news.eternal-september.org>	<mailman.292.1267717742.23598.python-list@python.org>	<hmooo6$pg0$1@news.eternal-september.org>	<mailman.300.1267723245.23598.python-list@python.org>	<hmoul7$2i9$1@news.eternal-september.org>	<mailman.314.1267744631.23598.python-list@python.org>	<hmph3
	b$20o$1@news.eternal-september.org>	<mailman.439.1268013689.23598.python-list@python.org>
	<hn29il$sbv$1@news.eternal-september.org>
Message-ID: <hn2qia$886$1@dough.gmane.org>

Alf P. Steinbach wrote:
> * Gabriel Genellina:
>> En Thu, 04 Mar 2010 20:52:04 -0300, Alf P. Steinbach <alfps at start.no>
>> escribi?:
>>
>>> Sorry, as with the places noted above, I can't understand what you're
>>> trying to say here.
>>
>> Regarding your posts, neither can I. All the time. Sorry, deciphering
>> your posts would force me to spend much more time than available and I
>> can't afford that - so I'm blocking your messages from now on.
> 
> 
> You could just ask if there was anything you didn't understand.
> 
> Even with as little you quote readers can see my approach to that
> problem: asking.
> 
> But your response, both the out of context quoting and your comment,
> seems solely designed to convey a negative impression instead of
> addressing any technical issue.
> 
This isn't an isolated case, Alf. Physician, heal thyself.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Mon Mar  8 07:33:57 2010
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 08 Mar 2010 07:33:57 -0500
Subject: libc Sleep api performs a busy waiting
In-Reply-To: <a52b97c0-7266-4bc6-9ab4-3a8688120a6c@u19g2000prh.googlegroups.com>
References: <a52b97c0-7266-4bc6-9ab4-3a8688120a6c@u19g2000prh.googlegroups.com>
Message-ID: <hn2qta$886$2@dough.gmane.org>

Mahesh wrote:
> Hi,
> 
>  I am having a problem while using sleep function from libc , the
> thread in which i am calling it is getting struck and not allowing
> other threads to execute.  Here is a simple code that i am trying to
> exeute
> 
> import threading
> import time
> import dl
> 
> 
> def dummy1():
>     a=dl.open('/lib/libc.so.6')
>     print "in thread 1 Start"
>     a.call('sleep',2)
>     #time.sleep(2)
>     print "in thread 1 End"
> 
> def dummy2():
>     print "in thread 2 Start"
>     time.sleep(1)
>     print "in thread 2 End"
> newThread1=threading.Thread(None,dummy1)
> newThread2=threading.Thread(None,dummy2)
> newThread1.start()
> newThread2.start()
> 
> print "in main"
> 
> 
> 
> The out put of this program is  (In this case thread 1 even though i
> am calling a sleep function its not allowing other threads to execute,
> other threads execute only after the completion of first thread)
> 
> in thread 1 Start
> in thread 1 End
> in thread 2 Start
> in main
> in thread 2 End
> 
> 
> where as if i use time.sleep instead of a.call(sleep) the out put is
> (which i guess is right behaviour, because it start the threads and
> suspends them because the have sleep , and continue executing the main
> thread)
> in thread 1 Start
> in thread 2 Start
> in main
> in thread 2 End
> in thread 1 End
> 
> 
Why not just use the time module's sleep function? Unlike the libc code
it releases Python's GIL (global interpreter lock), thus allowing other
threads to run.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From jeanmichel at sequans.com  Mon Mar  8 08:02:46 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 08 Mar 2010 14:02:46 +0100
Subject: Conditional based on whether or not a module is being used
In-Reply-To: <f4de1c96-502a-42e7-b647-ce52d0f76f2f@u15g2000prd.googlegroups.com>
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>	<50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com>
	<14a5cd5e1003051225j1d596aa2nfe9eb1047037f19d@mail.gmail.com>
	<mailman.383.1267823696.23598.python-list@python.org>
	<f4de1c96-502a-42e7-b647-ce52d0f76f2f@u15g2000prd.googlegroups.com>
Message-ID: <4B94F576.6050708@sequans.com>

Pete Emerson wrote:
> On Mar 5, 1:14 pm, Chris Rebert <c... at rebertia.com> wrote:
>   
>> On Fri, Mar 5, 2010 at 12:25 PM, Pete Emerson <pemer... at gmail.com> wrote:
>>     
>>> On Fri, Mar 5, 2010 at 12:17 PM, Chris Rebert <c... at rebertia.com> wrote:
>>>       
>>>> On 3/5/10, Pete Emerson <pemer... at gmail.com> wrote:
>>>>         
>>>>> In a module, how do I create a conditional that will do something
>>>>> based on whether or not another module has been loaded?
>>>>>           
>> <snip>
>>     
>>>>> If someone is using foo module, I want to take advantage of its
>>>>> features and use it in foobar, otherwise, I want to do something else.
>>>>> In other words, I don't want to create a dependency of foobar on foo.
>>>>>           
>>>>> My failed search for solving this makes me wonder if I'm approaching
>>>>> this all wrong.
>>>>>           
>>>> Just try importing foo, and then catch the exception if it's not installed.
>>>>         
>> <snip>
>>     
>>> Except I want to use the module only if the main program is using it
>>> too, not just if it's available for use. I think that I found a way in
>>> my follow-up post to my own message, but not sure it's the best way or
>>> conventional.
>>>       
>> What is your use case for this behavior exactly? You've piqued my curiosity.
>>
>> Cheers,
>> Chris
>> --http://blog.rebertia.com
>>     
>
> I have written my first module called "logger" that logs to syslog via
> the syslog module but also allows for logging to STDOUT in debug mode
> at multiple levels (to increase verbosity depending on one's need), or
> both. I've looked at the logging module and while it might suit my
> needs, it's overkill for me right now (I'm still *very* much a python
> newbie).
>
> I want to write other modules, and my thinking is that it makes sense
> for those modules to use the "logger" module to do the logging, if and
> only if the parent using the other modules is also using the logger
> module.
>
> In other words, I don't want to force someone to use the "logger"
> module just so they can use my other modules, even if the "logger"
> module is installed ... but I also want to take advantage of it if I'm
> using it.
>
> Now that I've written that, I'm not sure that makes a whole lot of
> sense. It seems like I could say, "hey, this person has the 'logger'
> module available, let's use it!".
>
> Thoughts?
>   
The logging module is not overkill, use it.
It can be simple if you want it to be, and can be more complex if you 
need advanced logging features.

All the "what if the application is not using my logger module" is dealt 
with by the logging module.
And I'm not its designer in any way, so my advice is completely 
objective :-)

It's definitely worth spending some time ramping up with it.

JM



From davea at ieee.org  Mon Mar  8 08:07:27 2010
From: davea at ieee.org (Dave Angel)
Date: Mon, 08 Mar 2010 08:07:27 -0500
Subject: Reverse engineering CRC?
In-Reply-To: <7vk3eiFtivU1@mid.individual.net>
References: <7vj7fdFnnjU1@mid.individual.net>	<4b9471ee$0$8836$c3e8da3@news.astraweb.com>
	<7vk3eiFtivU1@mid.individual.net>
Message-ID: <4B94F68F.3000100@ieee.org>

Gregory Ewing wrote:
> Steven D'Aprano wrote:
>
>> Can you just ask the application developer what CRC is being used? Or 
>> look at the source code? Disassemble the binary?
>
> There's no source, and the binary is enormous. I could ask,
> but I wouldn't hold out much hope of them being willing to
> tell me.
>
>>> it appears that the crc size may be at least
>>> 24 bits, so just trying all possible polynomials probably isn't doable.
>>
>> "At least"? Can't you tell by looking at them?
>
> It's not entirely clear exactly which bytes are part of the
> CRC. There are 3 adjacent bytes in the header of the file
> that change when I modify the contents, which led me to
> think it was a 24-bit CRC. But I now believe that one of
> them is not part of the CRC, and it's actually 16 bits.
>
> Using pycrc, I've now tried all possible 16-bit polynomials,
> with various combinations of bit and byte reversal, but I
> haven't found one that works consistently, so I'm wondering
> whether it's using some non-standard algorithm.
>
Or even some other standard algorithm.  If you know so little about the 
value, how do you even know it's a CRC ?  Could it be a ones-complement 
sum, such as used in Ethernet?

Is the problem really worth it?  The possibilities are practically 
unbounded.  And if the developer is really determined to make it 
difficult, they could be doing multiple passes over the data, in which 
case probably disassembly (or subtle debug tracing) may be your best bet.

DaveA

Dave



From jeanmichel at sequans.com  Mon Mar  8 08:10:48 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 08 Mar 2010 14:10:48 +0100
Subject: Import problem
In-Reply-To: <6630f859-b85d-4841-b1d5-2a563dca9cbb@q15g2000yqj.googlegroups.com>
References: <6630f859-b85d-4841-b1d5-2a563dca9cbb@q15g2000yqj.googlegroups.com>
Message-ID: <4B94F758.9080101@sequans.com>

Johny wrote:
> I have this directory structure
>
> C:
>       \A
>          __init__.py
>          amodule.py
>
>          \B
>           __init__.py
>           bmodule.py
>
>            \D
>             __init__.py
>             dmodule.py
>
> and  I want to import  bmodule.py
> C:\>cd \
>
> C:\>python
> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
> (Intel)] on win
> 32
> Type "help", "copyright", "credits" or "license" for more information.
>   
>>>> from A.B import  bmodule
>>>>         
> I am bmodule
>   
> C:\>
>
> so far so good. Now I would like to import bmodule but if the current
> directory is \D subdirectory.
>
> C:> cd \A\B\D
> C:\A\B\D>
> C:\A\B\D>python
> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
> (Intel)] on win
> 32
> Type "help", "copyright", "credits" or "license" for more information.
>   
>>>> import sys
>>>> sys.path.append('C:\\A')
>>>> from A.B import bmodule
>>>>         
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> ImportError: No module named A.B
>
> C:\>
>
> so I can not import a module from the parent directory? Or where did I
> make an error?
> Thanks for help
>
> L.
>   
try

import sys
sys.path.append('C:\\')
from A.B import bmodule


JM



From earnmoney9421 at gmail.com  Mon Mar  8 08:40:03 2010
From: earnmoney9421 at gmail.com (Google Adsense)
Date: Mon, 8 Mar 2010 05:40:03 -0800 (PST)
Subject: What to do if anything bites.
Message-ID: <dbf9320f-a9b9-492c-9a5e-c687422c1464@y7g2000prc.googlegroups.com>

What to do if anything bites.

Check our bites treatment at

http://108ambulance.blogspot.com/2010/03/108-ambulance-home-page.html


From aotto1968 at users.sourceforge.net  Mon Mar  8 08:43:46 2010
From: aotto1968 at users.sourceforge.net (Andreas Otto)
Date: Mon, 08 Mar 2010 14:43:46 +0100
Subject: ANNOUNCE: Major Feature Release - NHI1-0.7, PLMK-1.6 and libmsgque-4.5
Message-ID: <hn2uui$qb5$03$2@news.t-online.com>

Dear User,


ANNOUNCE:    Major Feature Release
====================================

  libmsgque: Application-Server-Toolkit for
             C, C++, JAVA, C#, TCL, PERL, PYTHON, VB.NET
  PLMK:      Programming-Language-Microkernel
  NHI1:      Non-Human-Intelligence #1


SUMMARY
=======

This is a 'major-feature-release' to add 'longtime-transaction' support.

A 'longtime-transaction' is a transaction with a possible infinite time
period between the start and the end. A 'longtime-transaction' is always
a 'persistent-transaction' too. The 'persistent' support is available as
an in-memory solution on the 'application-server' or in an additional
'bidirectional-filter' available for the next release.

A typical scenario for a 'longtime-transaction' is:

* A user with a client connect to the server and start a
'longtime-transaction' job. After a while the user shutdown the client
and leave the office. At the next morning the user start the client
again and the results are send from the server to the client.
* On a space mission the time-overhead between transaction start and end
is large. It is usually not possible to keep the
client-server-connection open all the time.
* On a military action-system the enemy try to interrupted the
client-server-connection to disable data communication.

To use a 'longtime-transaction' the results are send to a
'client-service' registered with MqServiceCreate. This service and
addtional data (I call this data 'local-context-data') have to be added
to the 'longterm-transaction' package to be available in the result. On the
'link-target' the 'local-context-data' is initial stripped from the
'data-package' and is later added to the results again.

The 'local-context-data' is added to the 'data-package' with
MqSendT_START and MqSendT_END.
The 'local-context-data' is read from the 'data-package' with
MqReadT_START and MqReadT_END.


LINKS
=====

  libmsgque:
   > http://nhi1.berlios.de/theLink/index.htm
  NHI1:
   > http://nhi1.berlios.de/
  DOWNLOAD:
   > http://developer.berlios.de/projects/nhi1/



mfg

  Andreas Otto (aotto1968)


From ssteinerx at gmail.com  Mon Mar  8 09:03:21 2010
From: ssteinerx at gmail.com (ssteinerX@gmail.com)
Date: Mon, 8 Mar 2010 09:03:21 -0500
Subject: A "scopeguard" for Python
In-Reply-To: <hn2qia$886$1@dough.gmane.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>	<hmn03d$5r6$1@news.eternal-september.org>	<mailman.292.1267717742.23598.python-list@python.org>	<hmooo6$pg0$1@news.eternal-september.org>	<mailman.300.1267723245.23598.python-list@python.org>	<hmoul7$2i9$1@news.eternal-september.org>	<mailman.314.1267744631.23598.python-list@python.org>	<hmph3
	b$20o$1@news.eternal-september.org>	<mailman.439.1268013689.23598.python-list@python.org>
	<hn29il$sbv$1@news.eternal-september.org>
	<hn2qia$886$1@dough.gmane.org>
Message-ID: <759A6420-DC8E-4282-8667-6C851D5E0AC8@gmail.com>

On Mar 8, 2010, at 7:28 AM, Steve Holden wrote:

>> 
>> But your response, both the out of context quoting and your comment,
>> seems solely designed to convey a negative impression instead of
>> addressing any technical issue.
>> 
> This isn't an isolated case, Alf. Physician, heal thyself.

As far as I can tell, this happens on every thread Alf is involved in at one point or another.  I'm sure it's "everyone else."

S



From xahlee at gmail.com  Mon Mar  8 10:12:05 2010
From: xahlee at gmail.com (Xah Lee)
Date: Mon, 8 Mar 2010 07:12:05 -0800 (PST)
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<4b90a1f8$0$1629$742ec2ed@news.sonic.net>
Message-ID: <0d381135-730a-45e4-9225-9ba2a29b77fe@k2g2000pro.googlegroups.com>

many people mentioned scalibility... though i think it is fruitful to
talk about at what size is the NoSQL databases offer better
scalability than SQL databases.

For example, consider, if you are within world's top 100th user of
database in terms of database size, such as Google, then it may be
that the off-the-shelf tools may be limiting. But how many users
really have such massive size of data?

note that google's need for database today isn't just a seach engine.
It's db size for google search is probably larger than all the rest of
search engine company's sizes combined. Plus, there's youtube (vid
hosting), gmail, google code (source code hosting), google blog, orkut
(social networking), picasa (photo hosting), etc, each are all ranked
within top 5 or so with respective competitors in terms of number of
accounts... so, google's datasize is probably number one among the
world's user of databases, probably double or triple than the second
user with the most large datasize. At that point, it seems logical
that they need their own db, relational or not.

  Xah
? http://xahlee.org/

?

On Mar 4, 10:35?pm, John Nagle <na... at animats.com> wrote:
> Xah Lee wrote:
> > recently i wrote a blog article on The NoSQL Movement
> > athttp://xahlee.org/comp/nosql.html
>
> > i'd like to post it somewhere public to solicit opinions, but in the
> > 20 min or so, i couldn't find a proper newsgroup, nor private list
> > that my somewhat anti-NoSQL Movement article is fitting.
>
> ? ? Too much rant, not enough information.
>
> ? ? There is an argument against using full relational databases for
> some large-scale applications, ones where the database is spread over
> many machines. ?If the database can be organized so that each transaction
> only needs to talk to one database machine, the locking problems become
> much simpler. ?That's what BigTable is really about.
>
> ? ? For many web applications, each user has more or less their own data,
> and most database activity is related to a single user. ?Such
> applications can easily be scaled up with a system that doesn't
> have inter-user links. ?There can still be inter-user references,
> but without a consistency guarantee. ?They may lead to dead data,
> like Unix/Linux symbolic links. ?This is a mechanism adequate
> for most "social networking" sites.
>
> ? ? There are also some "consistent-eventually" systems, where a query
> can see old data. ?For non-critical applications, those can be
> very useful. ?This isn't a SQL/NoSQL thing; MySQL asynchronous
> replication is a "consistent-eventually" system. ?Wikipedia uses
> that for the "special" pages which require database lookups.
>
> ? ? If you allow general joins across any tables, you have to have all
> the very elaborate interlocking mechanisms of a distributed database.
> The serious database systems (MySQL Cluster and Oracle, for example)
> do offer that, but there are usually
> substantial complexity penalties, and the databases have to be carefully
> organized to avoid excessive cross-machine locking. ?If you don't need
> general joins, a system which doesn't support them is far simpler.
>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? John Nagle



From rolf.oltmans at gmail.com  Mon Mar  8 10:36:13 2010
From: rolf.oltmans at gmail.com (Oltmans)
Date: Mon, 8 Mar 2010 07:36:13 -0800 (PST)
Subject: Converting HTML to PDF using Python?
Message-ID: <1ca0597c-b5c7-496c-8636-2dd1359592be@y7g2000prc.googlegroups.com>

Hi Python superstars,

Guys, any ideas on how to convert HTML files to PDF files? Or as an
alternative, how to convert HTML files to an image file(jpeg/png/etc)?
Ideally, the converted PDF/Image file should like exactly like the way
HTML file looks in the browser.

I really have no idea about this so I will really appreciate all the
help. Thanks in advance and kindly pardon my ignorance.

Thanks,
Oltmans


From clp2 at rebertia.com  Mon Mar  8 11:16:45 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 8 Mar 2010 08:16:45 -0800
Subject: negative "counts" in collections.Counter?
In-Reply-To: <4b94ebbd$0$8762$c3e8da3@news.astraweb.com>
References: <mailman.437.1267995887.23598.python-list@python.org>
	<m2eijv4vtk.fsf@googlemail.com>
	<4b9456f4$0$8836$c3e8da3@news.astraweb.com>
	<e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com>
	<4b94ebbd$0$8762$c3e8da3@news.astraweb.com>
Message-ID: <50697b2c1003080816m46752277of34e9bf4bd9670d6@mail.gmail.com>

On Mon, Mar 8, 2010 at 4:21 AM, Steven D'Aprano <
steve at remove-this-cybersource.com.au> wrote:
> On Sun, 07 Mar 2010 22:31:00 -0800, Raymond Hettinger wrote:
>> On Mar 7, 5:46 pm, Steven D'Aprano <st... at REMOVE-THIS-
>> cybersource.com.au> wrote:
>>> Given that Counter supports negative counts, it looks to me that the
>>> behaviour of __add__ and __sub__ is fundamentally flawed. You should
>>> raise a bug report (feature enhancement) on the bug tracker.
>>
>> It isn't a bug.  I designed it that way. There were several possible
>> design choices, each benefitting different use cases.
<snip>
>> Instead the choice was to implement the four methods as multiset
>> operations.  As such, they need to correspond to regular set operations.
>
> Personally, I think the behaviour of + and - would be far less surprising
> if the class was called Multiset. Intuitively, one would expect counters
> to be limited to ints, and to support negative counts when adding and
> subtracting. In hindsight, do you think that Multiset would have been a
> better name?

Of course I'm not Raymond, but I'd encourage reading the original
announcement thread where that and related issues were discussed:
http://mail.python.org/pipermail/python-list/2009-January/1189466.html

To summarize the arguments against "Multiset":
* the API is primarily dict-like, not set-like
** related to this, len() and .items() don't behave in what is arguably an
"intuitive" way for multisets
* the API allows for negative counts; sets don't normally allow negative
multiplicities

The same pretty much also goes for why "Bag" wouldn't be an appropriate
name.

Finally, it leaves the names available for when a proper Bag/Multiset is
added. :)

Cheers,
Chris
--
http://blog.rebertia.com
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From sanelson at gmail.com  Mon Mar  8 12:06:25 2010
From: sanelson at gmail.com (Stephen Nelson-Smith)
Date: Mon, 8 Mar 2010 17:06:25 +0000
Subject: Trouble with quotes
Message-ID: <b6131fdc1003080906r7774df2ax7dbbc38af5133cf7@mail.gmail.com>

Hi,

I've written some (primitive) code to parse some apache logfies and
establish if apache has appended a session cookie to the end.  We're
finding that some browsers don't and apache doesn't just append a "-"
- it just omits it.

It's working fine, but for an edge case:

Couldn't match  192.168.1.107 - - [24/Feb/2010:20:30:44 +0100] "GET
http://sekrit.com/node/175523 HTTP/1.1" 200 -
"http://sekrit.com/search/results/"3%2B2%20course"" "Mozilla/4.0
(compatible; MSIE 6.0; Windows NT 5.1; SV1; GTB6.4)"
Couldn't match  192.168.1.107 - - [24/Feb/2010:20:31:15 +0100] "GET
http://sekrit.com/node/175521 HTTP/1.1" 200 -
"http://sekrit.com/search/results/"3%2B2%20course"" "Mozilla/4.0
(compatible; MSIE 6.0; Windows NT 5.1; SV1; GTB6.4)"
Couldn't match  192.168.1.107 - - [24/Feb/2010:20:32:07 +0100] "GET
http://sekrit.com/node/175520 HTTP/1.1" 200 -
"http://sekrit.com/search/results/"3%2B2%20course"" "Mozilla/4.0
(compatible; MSIE 6.0; Windows NT 5.1; SV1; GTB6.4)"
Couldn't match  192.168.1.107 - - [24/Feb/2010:20:32:33 +0100] "GET
http://sekrit.com/node/175522 HTTP/1.1" 200 -
"http://sekrit.com/search/results/"3%2B2%20course"" "Mozilla/4.0
(compatible; MSIE 6.0; Windows NT 5.1; SV1; GTB6.4)"
Couldn't match  192.168.1.107 - - [24/Feb/2010:20:33:01 +0100] "GET
http://sekrit.com/node/175527 HTTP/1.1" 200 -
"http://sekrit.com/search/results/"3%2B2%20course"" "Mozilla/4.0
(compatible; MSIE 6.0; Windows NT 5.1; SV1; GTB6.4)"
Couldn't match  192.168.1.107 - - [25/Feb/2010:17:01:54 +0100] "GET
http://sekrit.com/search/results/ HTTP/1.0" 200 -
"http://sekrit.com/search/results/"guideline%20grids"&page=1"
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR
1.1.4322; .NET CLR 2.0.50727)"
Couldn't match  192.168.1.107 - - [25/Feb/2010:17:02:15 +0100] "GET
http://sekrit.com/search/results/ HTTP/1.0" 200 -
"http://sekrit.com/search/results/"guideline%20grids"&page=1"
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR
1.1.4322; .NET CLR 2.0.50727)"

If there are " " inside the request string, my regex breaks.

Here's the code:

#!/usr/bin/env python
import re

pattern = r'(?P<ForwardedFor>^(-|[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}(,
[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3})*){1})
(?P<RemoteLogname>(\S*)) (?P<RemoteUser>(\S*))
(?P<Timestamp>(\[[^\]]+\]))
(?P<FirstLineOfRequest>(\"([^"\\]*(?:\\.[^"\\]*)*)\")?)
(?P<Status>(\S*)) (?P<Size>(\S*))
(?P<Referrer>(\"([^"\\]*(?:\\.[^"\\]*)*)\")?)
(?P<UserAgent>(\"([^"\\]*(?:\\.[^"\\]*)*)\")?)(
)?(?P<SiteIntelligenceCookie>(\"([^"\\]*(?:\\.[^"\\]*)*)\")?)'

regex = re.compile(pattern)

lines = 0
no_cookies = 0
unmatched = 0

for line in open('/home/stephen/scratch/test-data.txt'):
  lines +=1
  line = line.strip()
  match = regex.match(line)

  if match:
    data = match.groupdict()
    if data['SiteIntelligenceCookie'] == '':
      no_cookies +=1
  else:
    print "Couldn't match ", line
    unmatched +=1

print "I analysed %s lines." % (lines,)
print "There were %s lines with missing Site Intelligence cookies." %
(no_cookies,)
print "I was unable to process %s lines." % (unmatched,)

How can I make the regex a bit more resilient so it doesn't break when
" " is embedded?

-- 
Stephen Nelson-Smith
Technical Director
Atalanta Systems Ltd
www.atalanta-systems.com


From martin.hellwig at dcuktec.org  Mon Mar  8 12:40:07 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Mon, 08 Mar 2010 17:40:07 +0000
Subject: Trouble with quotes
In-Reply-To: <mailman.463.1268067986.23598.python-list@python.org>
References: <mailman.463.1268067986.23598.python-list@python.org>
Message-ID: <hn3cpn$fej$1@news.eternal-september.org>

On 03/08/10 17:06, Stephen Nelson-Smith wrote:
> Hi,
>
> I've written some (primitive) code to parse some apache logfies and
> establish if apache has appended a session cookie to the end.  We're
> finding that some browsers don't and apache doesn't just append a "-"
> - it just omits it.
>
> It's working fine, but for an edge case:
>
> Couldn't match  192.168.1.107 - - [24/Feb/2010:20:30:44 +0100] "GET
> http://sekrit.com/node/175523 HTTP/1.1" 200 -
> "http://sekrit.com/search/results/"3%2B2%20course"" "Mozilla/4.0
> (compatible; MSIE 6.0; Windows NT 5.1; SV1; GTB6.4)"
<cut rest>
I didn't try to mentally parse the regex pattern (I like to keep 
reasonably sane). However from the sounds of it the script barfs when 
there is a quoted part in the second URL part. So how about doing a 
simple string.replace('/"','') & string.replace('" ','') before doing 
your re foo?

-- 
mph


From cmpython at gmail.com  Mon Mar  8 12:51:51 2010
From: cmpython at gmail.com (CM)
Date: Mon, 8 Mar 2010 09:51:51 -0800 (PST)
Subject: Converting HTML to PDF using Python?
References: <1ca0597c-b5c7-496c-8636-2dd1359592be@y7g2000prc.googlegroups.com>
Message-ID: <4bd454b4-1f00-425a-aa37-cd3a63f7fe8f@z4g2000yqa.googlegroups.com>

On Mar 8, 10:36?am, Oltmans <rolf.oltm... at gmail.com> wrote:
> Hi Python superstars,
>
> Guys, any ideas on how to convert HTML files to PDF files? Or as an
> alternative, how to convert HTML files to an image file(jpeg/png/etc)?
> Ideally, the converted PDF/Image file should like exactly like the way
> HTML file looks in the browser.
>
> I really have no idea about this so I will really appreciate all the
> help. Thanks in advance and kindly pardon my ignorance.
>
> Thanks,
> Oltmans

http://lmgtfy.com/?q=python+html+to+pdf


From dinov at microsoft.com  Mon Mar  8 13:44:37 2010
From: dinov at microsoft.com (Dino Viehland)
Date: Mon, 8 Mar 2010 18:44:37 +0000
Subject: ssl, v23 client, v3 server...
Message-ID: <1A472770E042064698CB5ADC83A12ACD393F30FD@TK5EX14MBXC118.redmond.corp.microsoft.com>

In the ssl module docs (and in the tests) it says that if you have a client specifying PROTOCOL_SSLv23 (so it'll use v2 or v3) and a server specifying PROTOCOL_SSLv3 (so it'll only use v3) that you cannot connect between the two.  Why doesn't this end up using SSL v3 for the communication?


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From tjreedy at udel.edu  Mon Mar  8 13:48:01 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 08 Mar 2010 13:48:01 -0500
Subject: Converting HTML to PDF using Python?
In-Reply-To: <4bd454b4-1f00-425a-aa37-cd3a63f7fe8f@z4g2000yqa.googlegroups.com>
References: <1ca0597c-b5c7-496c-8636-2dd1359592be@y7g2000prc.googlegroups.com>
	<4bd454b4-1f00-425a-aa37-cd3a63f7fe8f@z4g2000yqa.googlegroups.com>
Message-ID: <hn3gou$36i$1@dough.gmane.org>

On 3/8/2010 12:51 PM, CM wrote:
> On Mar 8, 10:36 am, Oltmans<rolf.oltm... at gmail.com>  wrote:
>> Hi Python superstars,
>>
>> Guys, any ideas on how to convert HTML files to PDF files? Or as an
>> alternative, how to convert HTML files to an image file(jpeg/png/etc)?
>> Ideally, the converted PDF/Image file should like exactly like the way
>> HTML file looks in the browser.

How an HTML file looks in *a* (not *the*) browser depends on the 
browser, its settings, and window size. That is both a virtue and a 
reason for the invention of pdf format.

>> I really have no idea about this so I will really appreciate all the
>> help. Thanks in advance and kindly pardon my ignorance.
>>
>> Thanks,
>> Oltmans
>
> http://lmgtfy.com/?q=python+html+to+pdf




From debatem1 at gmail.com  Mon Mar  8 14:05:34 2010
From: debatem1 at gmail.com (geremy condra)
Date: Mon, 8 Mar 2010 14:05:34 -0500
Subject: Calculating very large exponents in python
In-Reply-To: <COL110-W1236CED756D3C9374CB0A2B7350@phx.gbl>
References: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>
	<f3cc57c61003071240x18b580bend946824ef7955b6c@mail.gmail.com>
	<COL110-W1236CED756D3C9374CB0A2B7350@phx.gbl>
Message-ID: <f3cc57c61003081105y43a2ef95u7699e7d65401fc8d@mail.gmail.com>

On Mon, Mar 8, 2010 at 2:15 AM, Fahad Ahmad <miraclesoul at hotmail.com> wrote:
> Thanks Geremy,
>
> That has been an absolute bump........... GOD i cant sit on my chair, it has
> worked even on 512 bit number and with no time..........
> superb i would say.
>
> lastly, i am using the code below to calculate Largest Prime factor of a
> number:
>
> print
> ('''==============================================================================='''
> ?????? '''????????????? CALCULATE? HIGHEST PRIME
> FACTOR????????????????????????????????? '''
>
> '''===============================================================================''')
>
> #!/usr/bin/env python
> def highest_prime_factor(n):
> ?? if isprime(n):
> ????? return n
> ?? for x in xrange(2,n ** 0.5 + 1):
> ????? if not n % x:
> ???????? return highest_prime_factor(n/x)
> def isprime(n):
> ?? for x in xrange(2,n ** 0.5 + 1):
> ????? if not n % x:
> ???????? return False
> ?? return True
> if? __name__ == "__main__":
> ?? import time
> ?? start = time.time()
> ?? print highest_prime_factor(1238162376372637826)
> ?? print time.time() - start
>
> the code works with a bit of delay on the number : "1238162376372637826" but
> extending it to
> (109026109913291424366305511581086089650628117463925776754560048454991130443047109026109913291424366305511581086089650628117463925776754560048454991130443047)
> ?makes python go crazy. Is there any way just like above, i can have it
> calculated it in no time.
>
>
> thanks for the support.

If you're just looking for the largest prime factor I would suggest using
a fermat factorization attack. In the example you gave, it returns
nearly immediately.

Geremy Condra


From debatem1 at gmail.com  Mon Mar  8 14:08:48 2010
From: debatem1 at gmail.com (geremy condra)
Date: Mon, 8 Mar 2010 14:08:48 -0500
Subject: Calculating very large exponents in python
In-Reply-To: <f3cc57c61003081105y43a2ef95u7699e7d65401fc8d@mail.gmail.com>
References: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>
	<f3cc57c61003071240x18b580bend946824ef7955b6c@mail.gmail.com>
	<COL110-W1236CED756D3C9374CB0A2B7350@phx.gbl>
	<f3cc57c61003081105y43a2ef95u7699e7d65401fc8d@mail.gmail.com>
Message-ID: <f3cc57c61003081108w43f9d50l1be41ffd827ac1dd@mail.gmail.com>

On Mon, Mar 8, 2010 at 2:05 PM, geremy condra <debatem1 at gmail.com> wrote:
> On Mon, Mar 8, 2010 at 2:15 AM, Fahad Ahmad <miraclesoul at hotmail.com> wrote:
>> Thanks Geremy,
>>
>> That has been an absolute bump........... GOD i cant sit on my chair, it has
>> worked even on 512 bit number and with no time..........
>> superb i would say.
>>
>> lastly, i am using the code below to calculate Largest Prime factor of a
>> number:
>>
>> print
>> ('''==============================================================================='''
>> ?????? '''????????????? CALCULATE? HIGHEST PRIME
>> FACTOR????????????????????????????????? '''
>>
>> '''===============================================================================''')
>>
>> #!/usr/bin/env python
>> def highest_prime_factor(n):
>> ?? if isprime(n):
>> ????? return n
>> ?? for x in xrange(2,n ** 0.5 + 1):
>> ????? if not n % x:
>> ???????? return highest_prime_factor(n/x)
>> def isprime(n):
>> ?? for x in xrange(2,n ** 0.5 + 1):
>> ????? if not n % x:
>> ???????? return False
>> ?? return True
>> if? __name__ == "__main__":
>> ?? import time
>> ?? start = time.time()
>> ?? print highest_prime_factor(1238162376372637826)
>> ?? print time.time() - start
>>
>> the code works with a bit of delay on the number : "1238162376372637826" but
>> extending it to
>> (109026109913291424366305511581086089650628117463925776754560048454991130443047109026109913291424366305511581086089650628117463925776754560048454991130443047)
>> ?makes python go crazy. Is there any way just like above, i can have it
>> calculated it in no time.
>>
>>
>> thanks for the support.
>
> If you're just looking for the largest prime factor I would suggest using
> a fermat factorization attack. In the example you gave, it returns
> nearly immediately.
>
> Geremy Condra
>

Allow me to add a very important caveat to my previous statement:
a fermat factorization is primarily useful if you know that your number
is a large semiprime, such as an RSA modulus, which I assume you
are. Otherwise, make sure and test for primality.

Geremy Con


From duncan.booth at invalid.invalid  Mon Mar  8 14:14:37 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 8 Mar 2010 19:14:37 GMT
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<4b90a1f8$0$1629$742ec2ed@news.sonic.net>
	<0d381135-730a-45e4-9225-9ba2a29b77fe@k2g2000pro.googlegroups.com>
Message-ID: <Xns9D35C3BFCE829duncanbooth@127.0.0.1>

Xah Lee <xahlee at gmail.com> wrote:

> For example, consider, if you are within world's top 100th user of
> database in terms of database size, such as Google, then it may be
> that the off-the-shelf tools may be limiting. But how many users
> really have such massive size of data?

You've totally missed the point. It isn't the size of the data you have 
today that matters, it's the size of data you could have in several years' 
time.

Maybe today you've got 10 users each with 10 megabytes of data, but you're 
aspiring to become the next twitter/facebook or whatever. It's a bit late 
as you approach 100 million users (and a petabyte of data) to discover that 
your system isn't scalable: scalability needs to be built in from day one.


From bob.aalsma at aalsmacons.nl  Mon Mar  8 14:15:32 2010
From: bob.aalsma at aalsmacons.nl (BobAalsma)
Date: Mon, 8 Mar 2010 11:15:32 -0800 (PST)
Subject: Newbie question: python versions differ per user?
Message-ID: <8a04bbfd-9c48-4397-8c81-c159dc1b8977@33g2000yqj.googlegroups.com>

I'm on Mac OS X 10.5.8 and downloaded 2.6.4 Mac Installer Disk Image
as/in(?) the sys admin user. For this user Pyhton 2.6.4 is now the
current version.
I want to use Python outside the sys asdmin user. However, all other
users still use Python 2.5.1 (Apple delivered).

The sys admin user looks in /Library/Frameworks/Python.framework/
Versions/2.6/lib/...
The other users look in        /System/Library/Frameworks/
Python.framework/Version/2.5/lib/...

I could not find any questions on this matter, so am I the only one?
Did I do something wrong?
I assumed the paths for all users would be modified - too easy?


From dickinsm at gmail.com  Mon Mar  8 14:21:14 2010
From: dickinsm at gmail.com (Mark Dickinson)
Date: Mon, 8 Mar 2010 11:21:14 -0800 (PST)
Subject: Calculating very large exponents in python
References: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>
	<mailman.435.1267994462.23598.python-list@python.org>
Message-ID: <b7fbee2f-4a89-45b9-8904-4cb63a91adba@o3g2000yqb.googlegroups.com>

[Replying to Geremy's reply because the OP's post didn't show up in my
newsreader.]
On Mar 7, 8:40?pm, geremy condra <debat... at gmail.com> wrote:
> On Sun, Mar 7, 2010 at 1:55 PM, Fahad Ahmad <miracles... at hotmail.com> wrote:
> > Dear All,
>
> > i am writing my crytographic scheme in python, i am just a new user to it.
> > I have written the complete code, the only point i am stuck it is that i am
> > using 256 exponentiation which is normal in crytography but python just
> > hangs on it.
>
> > g**x? [where both g and x are 256 bit numbers , in decimal they are around
> > 77]

No library can solve this problem.  If g and x are both 256-bit
numbers then the result of g**x will have on the order of 10**79 bits,
which matches estimates of the number of particles in the universe.  I
can only imagine that you actually want g**x % m for some m, in which
case three-argument pow is your friend, as Geremy pointed out.

--
Mark


From python at rcn.com  Mon Mar  8 14:24:02 2010
From: python at rcn.com (Raymond Hettinger)
Date: Mon, 8 Mar 2010 11:24:02 -0800 (PST)
Subject: negative "counts" in collections.Counter?
References: <mailman.437.1267995887.23598.python-list@python.org> 
	<m2eijv4vtk.fsf@googlemail.com>
	<4b9456f4$0$8836$c3e8da3@news.astraweb.com> 
	<e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com> 
	<4b94ebbd$0$8762$c3e8da3@news.astraweb.com>
Message-ID: <06ddd3cf-d3dd-4e5d-9789-53a4f8a4bced@b5g2000prd.googlegroups.com>

[Steven D'Aprano]
> Thanks for the explanation Raymond. A few comments follow:

You're welcome :-)


> Would you consider a feature enhancement adding an additional method,
> analogous to update(), to perform subtractions? I recognise that it's
> easy to subclass and do it yourself, but there does seem to be some
> demand for it, and it is an obvious feature given that Counter does
> support negative counts.

Will continue to mull it over.

Instinct says that conflating two models can be worse for usability
than just picking one of the models and excluding the other.

If I had it to do over, there is a reasonable case that elementwise
vector methods (__add__, __sub__, and __mul__) may have been a more
useful choice than multiset methods (__add__, __sub__, __and__,
__or__).

That being said, the multiset approach was the one that was chosen.
It was indicated for people who have experience with bags or
multisets in other languages.   It was also consistent with the naming
of the class as tool for counting things (i.e. it handles counting
numbers right out of the box).  No explicit support is provided
for negative values, but it isn't actively hindered either.

For applications needing elementwise vector operations and signed
arithmetic, arguably they should be using a more powerful toolset,
perhaps supporting a full-range of elementwise binary and unary
operations and a dotproduct() method.  Someone should write that
class and post it to the ASPN Cookbook to see if there is any uptake.


> Personally, I think the behaviour of + and - would be far less surprising
> if the class was called Multiset. Intuitively, one would expect counters
> to be limited to ints, and to support negative counts when adding and
> subtracting. In hindsight, do you think that Multiset would have been a
> better name?

The primary use case for Counter() is to count things (using the
counting numbers).
The term Multiset is more obscure and only applies
to the four operations that eliminate non-positive results.
So, I'm somewhat happy with the current name.

FWIW, the notion of "what is surprising" often depends on the
observer's
background and on the problem they are currently trying to solve.
If you need negative counts, then Counter.__sub__() is surprising.
If your app has no notion of a negative count, then it isn't.
The docs, examples, and docstrings are very clear about the behavior,
so the "surprise" is really about wanting it to do something other
than what it currently does ;-)


Raymond





From daniel at stutzbachenterprises.com  Mon Mar  8 15:30:23 2010
From: daniel at stutzbachenterprises.com (Daniel Stutzbach)
Date: Mon, 8 Mar 2010 14:30:23 -0600
Subject: negative "counts" in collections.Counter?
In-Reply-To: <06ddd3cf-d3dd-4e5d-9789-53a4f8a4bced@b5g2000prd.googlegroups.com>
References: <mailman.437.1267995887.23598.python-list@python.org>
	<m2eijv4vtk.fsf@googlemail.com>
	<4b9456f4$0$8836$c3e8da3@news.astraweb.com>
	<e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com>
	<4b94ebbd$0$8762$c3e8da3@news.astraweb.com>
	<06ddd3cf-d3dd-4e5d-9789-53a4f8a4bced@b5g2000prd.googlegroups.com>
Message-ID: <eae285401003081230t280dbfc8q84cccca8bbb9da12@mail.gmail.com>

On Mon, Mar 8, 2010 at 1:24 PM, Raymond Hettinger <python at rcn.com> wrote:

> Instinct says that conflating two models can be worse for usability
> than just picking one of the models and excluding the other.
>

Toward that end, shouldn't Counter do one (and only one) of the follow?
1) Disallow non-positive counts (like a Multiset/Bag)
2) Allow them when subtracting

In other words, to avoid conflating two models the following two examples
should produce the same output:

>>> c = Counter({'red': 1})
>>> c['red'] -= 2
>>> c
Counter({'red': -1})

>>> c = Counter({'red': 1})
>>> c2 = Counter({'red': 2})
>>> c - c2
Counter()

--
Daniel Stutzbach, Ph.D.
President, Stutzbach Enterprises, LLC <http://stutzbachenterprises.com>
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From monkey at joemoney.net  Mon Mar  8 15:30:39 2010
From: monkey at joemoney.net (monkeys paw)
Date: Mon, 08 Mar 2010 15:30:39 -0500
Subject: write to remote ile
In-Reply-To: <hn1ork$edf$1@news.eternal-september.org>
References: <WpqdnTgN4vzhwQnWnZ2dnUVZ_tOdnZ2d@insightbb.com>
	<hn1msv$95d$1@news.eternal-september.org>
	<f--dnSFN38yw-wnWnZ2dnUVZ_gadnZ2d@insightbb.com>
	<hn1ork$edf$1@news.eternal-september.org>
Message-ID: <l4idnYQzYrbuwwjWnZ2dnUVZ_qudnZ2d@insightbb.com>

On 3/7/2010 9:53 PM, Martin P. Hellwig wrote:
> On 03/08/10 02:51, monkeys paw wrote:
>> On 3/7/2010 9:20 PM, Martin P. Hellwig wrote:
>>> On 03/08/10 02:10, monkeys paw wrote:
>>>> I can xfer a file from a remote server using:
>>>>
>>>> import urllib2 as u
>>>> x=u.urlopen('http://tycho.usno.navy.mil/cgi-bin/timer.pl')
>>>>
>>>> for line in x:
>>>> print line
>>>>
>>>>
>>>> How can i write a file to the remote server?
>>>>
>>>> I tried:
>>>>
>>>> x = u.url.open('http://joemoney.net/somefile.txt', 'w')
>>>>
>>>> but that does not work
>>>
>>> How do you normally (i.e. without python) put files on a remote server?
>>>
>> Using FTP, i'm really having a brain cramp here, but i'm new to python
>
> We all been there, in some for or other ;-), anyway you might want to
> have a look at this:
> http://docs.python.org/library/ftplib.html
>

Tried this, the storlines doesn't work, everything else OK

from ftplib import FTP
ftp = FTP('joemoney.net')
ftp.login('secret','pw')
ftp.retrlines('LIST')     # list directory contents
ftp.storlines('STOR', 'sf.xml')   # Is this incorrect, it throws error>

   File "ftp.py", line 5, in <module>
     ftp.storlines('STOR', 'sf.xml')
   File "C:\Python26\lib\ftplib.py", line 470, in storlines
     conn = self.transfercmd(cmd)
   File "C:\Python26\lib\ftplib.py", line 356, in transfercmd
     return self.ntransfercmd(cmd, rest)[0]
   File "C:\Python26\lib\ftplib.py", line 327, in ntransfercmd
     resp = self.sendcmd(cmd)
   File "C:\Python26\lib\ftplib.py", line 243, in sendcmd
     return self.getresp()
   File "C:\Python26\lib\ftplib.py", line 218, in getresp
     raise error_perm, resp
ftplib.error_perm: 501 No file name


The file exists in the same directory as ftp.py


From python at rcn.com  Mon Mar  8 16:44:34 2010
From: python at rcn.com (Raymond Hettinger)
Date: Mon, 8 Mar 2010 13:44:34 -0800 (PST)
Subject: negative "counts" in collections.Counter?
References: <mailman.437.1267995887.23598.python-list@python.org> 
	<m2eijv4vtk.fsf@googlemail.com>
	<4b9456f4$0$8836$c3e8da3@news.astraweb.com> 
	<e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com> 
	<mailman.455.1268046813.23598.python-list@python.org>
Message-ID: <feea9592-5625-4ddf-befe-490183f34ab0@d2g2000yqa.googlegroups.com>

[Vlastimil Brom]
> Thank you very much for the exhaustive explanation Raymond!

You're welcome.


> I am by far not able to follow all of the mathematical background, but
> even for zero-truncating multiset, I would expect the truncation on
> input rather than on output of some operations.

I debated about this and opted for be-loose-in-receiving-and-strict-on-
output.
One thought is that use cases for multisets would have real multisets
as inputs (no negative counts) and as outputs.  The user controls
the inputs, and the method only has a say in what its outputs are.

Also, truncating input would complicate the mathematical definition
of
what is happening.  Compare:

    r = a[x] - b[x]
    if r > 0:
        emit(r)

vs.

    r = max(0, a[x]) - max(0, b[x])
    if r > 0:
        emit(r)

Also, the design parallels what is done in the decimal module
where rounding is applied only to the results of operations,
not to the inputs.


> Probably a kind of negative_update() ?or some better named method will
> be handy, like the one you supplied or simply the current module code
> without the newcount > 0: ... condition.

See my other post on this subject.  There is no doubt that
such a method would be handy for signed arithmetic.
The question is whether conflating two different models hurts
the API more than it helps.  Right now, the Counter() class
has no explicit support for negative values.  It is
designed around natural numbers and counting numbers.


> Or would it be an option to
> have a keyword argument like zero_truncate=False which would influence
> this behaviour?

Guido's thoughts on behavior flags is that they are usually a signal
that you need two different classes.  That is why itertools has
ifilter() and ifilterfalse() or izip() and izip_longest() instead
of having behavior flags.

In this case, we have an indication that what you really want is
a separate class supporting elementwise binary and unary operations
on vectors (where the vector fields are accessed by a dictionary
key instead of a positional value).


> Additionally, were issubset and issuperset considered for this
> interface (not sure whether symmetric_difference would be applicable)?

If the need arises, these could be included.  Right now, you
can get the same result with:  "if a - b: ..."

FWIW, I never liked those two method names.  Can't remember whether
a.issubset(b) means "a is a subset of b" or "b issubset of a'.


Raymond


From news123 at free.fr  Mon Mar  8 17:06:34 2010
From: news123 at free.fr (News123)
Date: Mon, 08 Mar 2010 23:06:34 +0100
Subject: Import problem
In-Reply-To: <4b926b37$0$27829$c3e8da3@news.astraweb.com>
References: <6630f859-b85d-4841-b1d5-2a563dca9cbb@q15g2000yqj.googlegroups.com>
	<4b926b37$0$27829$c3e8da3@news.astraweb.com>
Message-ID: <4b9574ea$0$435$426a74cc@news.free.fr>

Hi Steven,

Steven D'Aprano wrote:
> On Sat, 06 Mar 2010 03:53:53 -0800, Johny wrote:
>
>>>>> import sys
>>>>> sys.path.append('C:\\A')
>>>>> from A.B import bmodule
>> Traceback (most recent call last):
>>   File "<stdin>", line 1, in <module>
>> ImportError: No module named A.B
>
> The current directory is irrelevant, except that it is automatically
> added to the PYTHONPATH. That's why you can import A.B when the current
> directory is C.

Minor currection:

It doesn't seem to be the current directory, but the directory, where
the script is located in, which is auto-appended to the pythonpath

Please see following example:

$ python -V
Python 2.6.4

$ mkdir A

$ touch A/__init__

$ # create A/blla.py an A/blo.py

$ cat A/bla.py
print "I am bla"
import A.blo
print "and I found blo",dir(A.blo)
$ cat A/blo.py
avar = 3
print "I am blo"

$ python A/bla.py
I am bla
Traceback (most recent call last):
  File "A/bla.py", line 2, in <module>
    import A.blo
ImportError: No module named A.blo



However:
$ cat alternative_bla.py
import sys
sys.path.append(".")
print "I am bla"
import A.blo
print "and I found blo",dir(A.blo)

$ python A/alternativ_bla.py
I am bla
I am blo
and I found blo ['__builtins__', '__doc__', '__file__', '__name__',
'__package__', 'avar']


bye N


From greg.ewing at canterbury.ac.nz  Mon Mar  8 17:16:24 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Tue, 09 Mar 2010 11:16:24 +1300
Subject: Reverse engineering CRC?
In-Reply-To: <mailman.459.1268053659.23598.python-list@python.org>
References: <7vj7fdFnnjU1@mid.individual.net>	<4b9471ee$0$8836$c3e8da3@news.astraweb.com>	<7vk3eiFtivU1@mid.individual.net>
	<mailman.459.1268053659.23598.python-list@python.org>
Message-ID: <7vlameF7goU1@mid.individual.net>

Dave Angel wrote:
> If you know so little about the 
> value, how do you even know it's a CRC ?  Could it be a ones-complement 
> sum, such as used in Ethernet?

I'm going by the fact that the application reports a
"CRC mismatch" when it's wrong. I can't be sure that what
it calls a "CRC" is really a true CRC, but it's more than
a simple sum, because changing one bit in the file results
in a completely different value.

> Is the problem really worth it?

Probably not -- it looks like fixing the problem I'm trying
to fix by hand will be faster in the long run. I just thought
it might turn out to be a solved problem and someone could
point me to an algorithm for it, but it seems not.

-- 
Greg


From news123 at free.fr  Mon Mar  8 17:21:08 2010
From: news123 at free.fr (News123)
Date: Mon, 08 Mar 2010 23:21:08 +0100
Subject: Import problem
In-Reply-To: <mailman.460.1268053858.23598.python-list@python.org>
References: <6630f859-b85d-4841-b1d5-2a563dca9cbb@q15g2000yqj.googlegroups.com>
	<mailman.460.1268053858.23598.python-list@python.org>
Message-ID: <4B957854.3070201@free.fr>

Jean-Michel Pichavant wrote:
> Johny wrote:
>> I have this directory structure
>>
>> C:
>>       \A
>>          __init__.py
>>          amodule.py
>>
>>          \B
>>           __init__.py
>>           bmodule.py
>>
>>            \D
>>             __init__.py
>>             dmodule.py
>>
>> and  I want to import  bmodule.py
>> C:\>cd \
>>
>> C:\>python
>> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
>> (Intel)] on win
>> 32
>> Type "help", "copyright", "credits" or "license" for more information.
>>  
>>>>> from A.B import  bmodule
>>>>>         
>> I am bmodule
>>   C:\>
>>
>> so far so good. Now I would like to import bmodule but if the current
>> directory is \D subdirectory.
>>
>> C:> cd \A\B\D
>> C:\A\B\D>
>> C:\A\B\D>python
>> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
>> (Intel)] on win
>> 32
>> Type "help", "copyright", "credits" or "license" for more information.
>>  
>>>>> import sys
>>>>> sys.path.append('C:\\A')
>>>>> from A.B import bmodule
>>>>>         
>> Traceback (most recent call last):
>>   File "<stdin>", line 1, in <module>
>> ImportError: No module named A.B
>>
>> C:\>
>>
>> so I can not import a module from the parent directory? Or where did I
>> make an error?
>> Thanks for help
>>
>> L.
>>   
> try
> 
> import sys
> sys.path.append('C:\\')
> from A.B import bmodule
> 
is there any 'automatic' way of finding the top level
directory?basically the 'top level directory is the first directory
going upwards, that doesn't contain a __init__.py file.

of course you could do this 'manually' by
doing:

# assume, that this module is A.amodule
import sys
import os

# I'd love to have a similiar automatic construct
if __name__ == "__main__":
    level = 1 # or function locating how far to go up before
              # finding a dir, whcih does not contain a __init__.py
    mydir = os.path.split(__file__)[0]
    topdir = os.path.join( mydir,*(("..",)*level))
    abstop = os.path.abspath(topdir)
    sys.path.append(abstop)

## now you can import with the normal module paths

import A.blo
print "and I found blo",dir(A.blo)


bye N





From news123 at free.fr  Mon Mar  8 17:21:26 2010
From: news123 at free.fr (News123)
Date: Mon, 08 Mar 2010 23:21:26 +0100
Subject: Import problem
In-Reply-To: <mailman.460.1268053858.23598.python-list@python.org>
References: <6630f859-b85d-4841-b1d5-2a563dca9cbb@q15g2000yqj.googlegroups.com>
	<mailman.460.1268053858.23598.python-list@python.org>
Message-ID: <4b957866$0$17135$426a34cc@news.free.fr>

Jean-Michel Pichavant wrote:
> Johny wrote:
>> I have this directory structure
>>
>> C:
>>       \A
>>          __init__.py
>>          amodule.py
>>
>>          \B
>>           __init__.py
>>           bmodule.py
>>
>>            \D
>>             __init__.py
>>             dmodule.py
>>
>> and  I want to import  bmodule.py
>> C:\>cd \
>>
>> C:\>python
>> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
>> (Intel)] on win
>> 32
>> Type "help", "copyright", "credits" or "license" for more information.
>>  
>>>>> from A.B import  bmodule
>>>>>         
>> I am bmodule
>>   C:\>
>>
>> so far so good. Now I would like to import bmodule but if the current
>> directory is \D subdirectory.
>>
>> C:> cd \A\B\D
>> C:\A\B\D>
>> C:\A\B\D>python
>> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
>> (Intel)] on win
>> 32
>> Type "help", "copyright", "credits" or "license" for more information.
>>  
>>>>> import sys
>>>>> sys.path.append('C:\\A')
>>>>> from A.B import bmodule
>>>>>         
>> Traceback (most recent call last):
>>   File "<stdin>", line 1, in <module>
>> ImportError: No module named A.B
>>
>> C:\>
>>
>> so I can not import a module from the parent directory? Or where did I
>> make an error?
>> Thanks for help
>>
>> L.
>>   
> try
> 
> import sys
> sys.path.append('C:\\')
> from A.B import bmodule
> 
is there any 'automatic' way of finding the top level
directory?basically the 'top level directory is the first directory
going upwards, that doesn't contain a __init__.py file.

of course you could do this 'manually' by
doing:

# assume, that this module is A.amodule
import sys
import os

# I'd love to have a similiar automatic construct
if __name__ == "__main__":
    level = 1 # or function locating how far to go up before
              # finding a dir, whcih does not contain a __init__.py
    mydir = os.path.split(__file__)[0]
    topdir = os.path.join( mydir,*(("..",)*level))
    abstop = os.path.abspath(topdir)
    sys.path.append(abstop)

## now you can import with the normal module paths

import A.blo
print "and I found blo",dir(A.blo)


bye N





From greg.ewing at canterbury.ac.nz  Mon Mar  8 17:22:28 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Tue, 09 Mar 2010 11:22:28 +1300
Subject: negative "counts" in collections.Counter?
In-Reply-To: <e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com>
References: <mailman.437.1267995887.23598.python-list@python.org>
	<m2eijv4vtk.fsf@googlemail.com>
	<4b9456f4$0$8836$c3e8da3@news.astraweb.com>
	<e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com>
Message-ID: <7vlb1qF9jaU1@mid.individual.net>

Raymond Hettinger wrote:

> Instead the choice was to implement the four methods as
> multiset operations.  As such, they need to correspond
> to regular set operations.

Seems to me you're trying to make one data type do the
work of two, and ending up with something inconsistent.

I think you should be providing two types: one is a
multiset, which disallows negative counts altogether;
the other behaves like a sparse vector with appropriate
arithmetic operations.

-- 
Greg


From vlastimil.brom at gmail.com  Mon Mar  8 17:24:43 2010
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Mon, 8 Mar 2010 23:24:43 +0100
Subject: negative "counts" in collections.Counter?
In-Reply-To: <feea9592-5625-4ddf-befe-490183f34ab0@d2g2000yqa.googlegroups.com>
References: <mailman.437.1267995887.23598.python-list@python.org>
	<m2eijv4vtk.fsf@googlemail.com>
	<4b9456f4$0$8836$c3e8da3@news.astraweb.com>
	<e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com>
	<mailman.455.1268046813.23598.python-list@python.org>
	<feea9592-5625-4ddf-befe-490183f34ab0@d2g2000yqa.googlegroups.com>
Message-ID: <9fdb569a1003081424j405d2bdblc2dc96a5ae6fa910@mail.gmail.com>

2010/3/8 Raymond Hettinger <python at rcn.com>:
...
[snip detailed explanations]
>...
> In this case, we have an indication that what you really want is
> a separate class supporting elementwise binary and unary operations
> on vectors (where the vector fields are accessed by a dictionary
> key instead of a positional value).
>
>
>> Additionally, were issubset and issuperset considered for this
>> interface (not sure whether symmetric_difference would be applicable)?
>
> If the need arises, these could be included. ?Right now, you
> can get the same result with: ?"if a - b: ..."
>
> FWIW, I never liked those two method names. ?Can't remember whether
> a.issubset(b) means "a is a subset of b" or "b issubset of a'.
>
>
> Raymond
> --
>
Thanks for the further remarks Raymond,
initially I thought while investigating new features of python 3, this
would be a case for replacing the "home made" solutions with the
standard module functionality.
Now I can see, it probably wouldn't be an appropriate decision in this
case, as the expected usage of Counter with its native methods is
different.

As for the issubset, issuperset method names, I am glad, a far more
skilled person has the same problem like me :-)   In this case the
operators appear to be clearer than the method names...

regards,
   vbr


From news123 at free.fr  Mon Mar  8 17:25:24 2010
From: news123 at free.fr (News123)
Date: Mon, 08 Mar 2010 23:25:24 +0100
Subject: libc Sleep api performs a busy waiting
In-Reply-To: <mailman.457.1268051709.23598.python-list@python.org>
References: <a52b97c0-7266-4bc6-9ab4-3a8688120a6c@u19g2000prh.googlegroups.com>
	<mailman.457.1268051709.23598.python-list@python.org>
Message-ID: <4b957954$0$17135$426a34cc@news.free.fr>

Hi Steve,

Steve Holden wrote:
> Mahesh wrote:
>> Hi,
>>
>>  I am having a problem while using sleep function from libc , the
>> thread in which i am calling it is getting struck and not allowing
>> other threads to execute.  Here is a simple code that i am trying to
>> exeute
>>
>> import threading
>> import time
>> import dl
>>
>>
>> def dummy1():
>>     a=dl.open('/lib/libc.so.6')
>>     print "in thread 1 Start"
>>     a.call('sleep',2)
>>     #time.sleep(2)
>>     print "in thread 1 End"
>>
>> def dummy2():
>>     print "in thread 2 Start"
>>     time.sleep(1)
>>     print "in thread 2 End"
>> newThread1=threading.Thread(None,dummy1)
>> newThread2=threading.Thread(None,dummy2)
>> newThread1.start()
>> newThread2.start()
>>
>> print "in main"
>>
>>
>>
>> The out put of this program is  (In this case thread 1 even though i
>> am calling a sleep function its not allowing other threads to execute,
>> other threads execute only after the completion of first thread)
>>
>> in thread 1 Start
>> in thread 1 End
>> in thread 2 Start
>> in main
>> in thread 2 End
>>
>>
>> where as if i use time.sleep instead of a.call(sleep) the out put is
>> (which i guess is right behaviour, because it start the threads and
>> suspends them because the have sleep , and continue executing the main
>> thread)
>> in thread 1 Start
>> in thread 2 Start
>> in main
>> in thread 2 End
>> in thread 1 End
>>
>>
> Why not just use the time module's sleep function? Unlike the libc code
> it releases Python's GIL (global interpreter lock), thus allowing other
> threads to run.
> 
I fully agree for the given example.
Especcially time.sleep allows even sub second sleeps.

Out of curiousity though:

Is there any way to perform a call(), that releases the GIL before
calling  the function?

It would avoid writing a wrapper?


bye


N


From news123 at free.fr  Mon Mar  8 17:26:32 2010
From: news123 at free.fr (News123)
Date: Mon, 08 Mar 2010 23:26:32 +0100
Subject: What to do if anything bites.
In-Reply-To: <dbf9320f-a9b9-492c-9a5e-c687422c1464@y7g2000prc.googlegroups.com>
References: <dbf9320f-a9b9-492c-9a5e-c687422c1464@y7g2000prc.googlegroups.com>
Message-ID: <4b957998$0$17135$426a34cc@news.free.fr>

Google Adsense wrote:
> What to do if anything bites.
> 
> Check our bites treatment at
> 
> http://108ambulance.blogspot.com/2010/03/108-ambulance-home-page.html

Pythons don't bite


From dimitri.pater at gmail.com  Mon Mar  8 17:34:06 2010
From: dimitri.pater at gmail.com (dimitri pater - serpia)
Date: Mon, 8 Mar 2010 23:34:06 +0100
Subject: related lists mean value
Message-ID: <e75321bd1003081434m27373b1esae82712d055c07c3@mail.gmail.com>

Hi,

I have two related lists:
x = [1 ,2, 8, 5, 0, 7]
y = ['a', 'a', 'b', 'c', 'c', 'c' ]

what I need is a list representing the mean value of 'a', 'b' and 'c'
while maintaining the number of items (len):
w = [1.5, 1.5, 8, 4, 4, 4]

I have looked at iter(tools) and next(), but that did not help me. I'm
a bit stuck here, so your help is appreciated!

thanks!
Dimitri


From python at rcn.com  Mon Mar  8 17:44:38 2010
From: python at rcn.com (Raymond Hettinger)
Date: Mon, 8 Mar 2010 14:44:38 -0800 (PST)
Subject: negative "counts" in collections.Counter?
References: <mailman.437.1267995887.23598.python-list@python.org> 
	<m2eijv4vtk.fsf@googlemail.com>
	<4b9456f4$0$8836$c3e8da3@news.astraweb.com> 
	<e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com> 
	<7vlb1qF9jaU1@mid.individual.net>
Message-ID: <34e15f30-8f7c-4f0f-82b7-6a65fe91ec88@w27g2000pre.googlegroups.com>

[Gregory Ewing]
> I think you should be providing two types: one is a
> multiset, which disallows negative counts altogether;
> the other behaves like a sparse vector with appropriate
> arithmetic operations.


That is pretty close to what I said above:

"""
In this case, we have an indication that what you really want is a
separate class supporting elementwise binary and unary operations on
vectors (where the vector fields are accessed by a dictionary key
instead of a positional value).
"""

The first and foremost goal of the class was to provide a simple
counting capability along the lines of:

    class Counter(dict):
       def __init__(self, iterable=()):
            for elem in iterable:
                self[elem] += 1
       def __missing__(self, key):
            return 0

Note, there is no "disallowing negatives" or even any insistence
that the "counts" are actually numbers.  In that respect, it was
a consenting adults class from the start.  It is short, simple,
and fast.

The other methods were mostly just "extras" to make the tool
more useful.  Each adds its own minimal restrictions:

   elements() requires integer counts
   most_common() requires that counts be orderable
   multiset operations are defined for non-negative values

We could have kept this same design and wrapped every dictionary
method so that it would raise an exception for any count that was not
a positive integer.  That would have slowed down the class, increased
the code volume, and precluded some uses that are currently possible.
IMO, that would not have been a win and it would not have helped the
OP who was seeking a more vector-like tool for signed-number
operations.

Anyway, it is what it is.  The tool is released and most
users seem to be happy with what we have.


Raymond


From python at mrabarnett.plus.com  Mon Mar  8 17:48:13 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Mon, 08 Mar 2010 22:48:13 +0000
Subject: write to remote ile
In-Reply-To: <l4idnYQzYrbuwwjWnZ2dnUVZ_qudnZ2d@insightbb.com>
References: <WpqdnTgN4vzhwQnWnZ2dnUVZ_tOdnZ2d@insightbb.com>	<hn1msv$95d$1@news.eternal-september.org>	<f--dnSFN38yw-wnWnZ2dnUVZ_gadnZ2d@insightbb.com>	<hn1ork$edf$1@news.eternal-september.org>
	<l4idnYQzYrbuwwjWnZ2dnUVZ_qudnZ2d@insightbb.com>
Message-ID: <4B957EAD.7070304@mrabarnett.plus.com>

monkeys paw wrote:
> On 3/7/2010 9:53 PM, Martin P. Hellwig wrote:
>> On 03/08/10 02:51, monkeys paw wrote:
>>> On 3/7/2010 9:20 PM, Martin P. Hellwig wrote:
>>>> On 03/08/10 02:10, monkeys paw wrote:
>>>>> I can xfer a file from a remote server using:
>>>>>
>>>>> import urllib2 as u
>>>>> x=u.urlopen('http://tycho.usno.navy.mil/cgi-bin/timer.pl')
>>>>>
>>>>> for line in x:
>>>>> print line
>>>>>
>>>>>
>>>>> How can i write a file to the remote server?
>>>>>
>>>>> I tried:
>>>>>
>>>>> x = u.url.open('http://joemoney.net/somefile.txt', 'w')
>>>>>
>>>>> but that does not work
>>>>
>>>> How do you normally (i.e. without python) put files on a remote server?
>>>>
>>> Using FTP, i'm really having a brain cramp here, but i'm new to python
>>
>> We all been there, in some for or other ;-), anyway you might want to
>> have a look at this:
>> http://docs.python.org/library/ftplib.html
>>
> 
> Tried this, the storlines doesn't work, everything else OK
> 
> from ftplib import FTP
> ftp = FTP('joemoney.net')
> ftp.login('secret','pw')
> ftp.retrlines('LIST')     # list directory contents
> ftp.storlines('STOR', 'sf.xml')   # Is this incorrect, it throws error>
> 
The documentation says:

     FTP.storlines(cmd, file, callback=None)

where 'cmd' is the FTP command, 'STOR sf.xml' ('sf.xl' is the path of
the file on the server) and 'file' is the open (local) source file.


From invalid at invalid.invalid  Mon Mar  8 18:06:35 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Mon, 8 Mar 2010 23:06:35 +0000 (UTC)
Subject: Converting HTML to PDF using Python?
References: <1ca0597c-b5c7-496c-8636-2dd1359592be@y7g2000prc.googlegroups.com>
Message-ID: <hn3vtr$knk$1@reader1.panix.com>

On 2010-03-08, Oltmans <rolf.oltmans at gmail.com> wrote:

> Guys, any ideas on how to convert HTML files to PDF files?

os.system("w3m -dump %s | a2ps -B --borders=no -o - | ps2pdf - %s" % (infile,outfile))

-- 
Grant Edwards               grant.b.edwards        Yow! Am I accompanied by a
                                  at               PARENT or GUARDIAN?
                              gmail.com            


From python at mrabarnett.plus.com  Mon Mar  8 18:15:44 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Mon, 08 Mar 2010 23:15:44 +0000
Subject: related lists mean value
In-Reply-To: <e75321bd1003081434m27373b1esae82712d055c07c3@mail.gmail.com>
References: <e75321bd1003081434m27373b1esae82712d055c07c3@mail.gmail.com>
Message-ID: <4B958520.8000701@mrabarnett.plus.com>

dimitri pater - serpia wrote:
> Hi,
> 
> I have two related lists:
> x = [1 ,2, 8, 5, 0, 7]
> y = ['a', 'a', 'b', 'c', 'c', 'c' ]
> 
> what I need is a list representing the mean value of 'a', 'b' and 'c'
> while maintaining the number of items (len):
> w = [1.5, 1.5, 8, 4, 4, 4]
> 
> I have looked at iter(tools) and next(), but that did not help me. I'm
> a bit stuck here, so your help is appreciated!
> 
Try doing it in 2 passes.

First pass: count the number of times each string occurs in 'y' and the
total for each (zip/izip and defaultdict are useful for these).

Second pass: create the result list containing the mean values.


From clp2 at rebertia.com  Mon Mar  8 18:22:39 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 8 Mar 2010 15:22:39 -0800
Subject: related lists mean value
In-Reply-To: <e75321bd1003081434m27373b1esae82712d055c07c3@mail.gmail.com>
References: <e75321bd1003081434m27373b1esae82712d055c07c3@mail.gmail.com>
Message-ID: <50697b2c1003081522p565ed44fxd68761c0b19bcfc7@mail.gmail.com>

On Mon, Mar 8, 2010 at 2:34 PM, dimitri pater - serpia
<dimitri.pater at gmail.com> wrote:
> Hi,
>
> I have two related lists:
> x = [1 ,2, 8, 5, 0, 7]
> y = ['a', 'a', 'b', 'c', 'c', 'c' ]
>
> what I need is a list representing the mean value of 'a', 'b' and 'c'
> while maintaining the number of items (len):
> w = [1.5, 1.5, 8, 4, 4, 4]
>
> I have looked at iter(tools) and next(), but that did not help me. I'm
> a bit stuck here, so your help is appreciated!

from __future__ import division

def group(keys, values):
    #requires None not in keys
    groups = []
    cur_key = None
    cur_vals = None
    for key, val in zip(keys, values):
        if key != cur_key:
            if cur_key is not None:
                groups.append((cur_key, cur_vals))
            cur_vals = [val]
            cur_key = key
        else:
            cur_vals.append(val)
    groups.append((cur_key, cur_vals))
    return groups

def average(lst):
    return sum(lst) / len(lst)

def process(x, y):
    result = []
    for key, vals in group(y, x):
        avg = average(vals)
        for i in xrange(len(vals)):
            result.append(avg)
    return result

x = [1 ,2, 8, 5, 0, 7]
y = ['a', 'a', 'b', 'c', 'c', 'c' ]

print process(x, y)
#=> [1.5, 1.5, 8.0, 4.0, 4.0, 4.0]

It could be tweaked to use itertools.groupby(), but it would probably
be less efficient/clear.

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


From davea at ieee.org  Mon Mar  8 18:24:07 2010
From: davea at ieee.org (Dave Angel)
Date: Mon, 08 Mar 2010 18:24:07 -0500
Subject: Reverse engineering CRC?
In-Reply-To: <7vlameF7goU1@mid.individual.net>
References: <7vj7fdFnnjU1@mid.individual.net>	<4b9471ee$0$8836$c3e8da3@news.astraweb.com>	<7vk3eiFtivU1@mid.individual.net>	<mailman.459.1268053659.23598.python-list@python.org>
	<7vlameF7goU1@mid.individual.net>
Message-ID: <4B958717.7040708@ieee.org>

Gregory Ewing wrote:
> <div class="moz-text-flowed" style="font-family: -moz-fixed">Dave 
> Angel wrote:
>> If you know so little about the value, how do you even know it's a 
>> CRC ?  Could it be a ones-complement sum, such as used in Ethernet?
>
> I'm going by the fact that the application reports a
> "CRC mismatch" when it's wrong. I can't be sure that what
> it calls a "CRC" is really a true CRC, but it's more than
> a simple sum, because changing one bit in the file results
> in a completely different value.
>
>> Is the problem really worth it?
>
> Probably not -- it looks like fixing the problem I'm trying
> to fix by hand will be faster in the long run. I just thought
> it might turn out to be a solved problem and someone could
> point me to an algorithm for it, but it seems not.
>
If you assume it's done in a single pass, and you know which byte is the 
end of the buffer, I'd think you could learn a lot by just tweaking that 
last byte.  But I still think you'd want to automate your testing, 
presumably by some keystroke-stuffer.

DaveA



From mensanator at aol.com  Mon Mar  8 18:32:14 2010
From: mensanator at aol.com (Mensanator)
Date: Mon, 8 Mar 2010 15:32:14 -0800 (PST)
Subject: Python 3.1.2 release candidate
References: <mailman.413.1267913634.23598.python-list@python.org>
Message-ID: <90da6fb8-e555-4a74-bf13-14878f60f5d4@g11g2000yqe.googlegroups.com>

On Mar 6, 4:13?pm, Benjamin Peterson <benja... at python.org> wrote:
> On behalf of the Python development team, I'm pleased to announce a release
> candidate for the second bugfix release of the Python 3.1 series, Python 3.1.2.
>
> This bug fix release fixes numerous issues found in 3.1.1. ?This release
> candidate has been released to solicit testing and feedback over an possible
> regressions from 3.1.1. ?Please consider testing it with your library or
> application and reporting an bugs you encounter. ?This will help make the final
> 3.1.2 release, planned in 2 weeks time, all the more stable.
>
> The Python 3.1 version series focuses on the stabilization and optimization of
> the features and changes that Python 3.0 introduced. ?For example, the new I/O
> system has been rewritten in C for speed. ?File system APIs that use unicode
> strings now handle paths with undecodable bytes in them. Other features include
> an ordered dictionary implementation, a condensed syntax for nested with
> statements, and support for ttk Tile in Tkinter. ?For a more extensive list of
> changes in 3.1, seehttp://doc.python.org/3.1/whatsnew/3.1.htmlor Misc/NEWS in
> the Python distribution.
>
> To download Python 3.1.2rc1 visit:
>
> ? ? ?http://www.python.org/download/releases/3.1.2/
>
> A list of changes in 3.1.2rc1 can be found here:
>
> ? ? ?http://svn.python.org/projects/python/tags/r312rc1/Misc/NEWS
>
> The 3.1 documentation can be found at:
>
> ? ? ?http://docs.python.org/3.1
>
> Bugs can always be reported to:
>
> ? ? ?http://bugs.python.org

Hey, it finally let me register. Turned out the e-mail
to confirm registry was getting marked Spam. I pulled it
out of the Spam box and completed the registration.

Of course, the reason I needed to register is because
IDLE will *still* not end a process properly in Windows.

see issue 8093

>
> Enjoy!
>
> --
> Benjamin Peterson
> Release Manager
> benjamin at python.org
> (on behalf of the entire python-dev team and 3.1.2's contributors)



From dimitri.pater at gmail.com  Mon Mar  8 18:47:12 2010
From: dimitri.pater at gmail.com (dimitri pater - serpia)
Date: Tue, 9 Mar 2010 00:47:12 +0100
Subject: related lists mean value
In-Reply-To: <50697b2c1003081522p565ed44fxd68761c0b19bcfc7@mail.gmail.com>
References: <e75321bd1003081434m27373b1esae82712d055c07c3@mail.gmail.com>
	<50697b2c1003081522p565ed44fxd68761c0b19bcfc7@mail.gmail.com>
Message-ID: <e75321bd1003081547s33999032kb86cfc4726ddb2c5@mail.gmail.com>

thanks Chris and MRAB!
Looks good, I'll try it out

On Tue, Mar 9, 2010 at 12:22 AM, Chris Rebert <clp2 at rebertia.com> wrote:
> On Mon, Mar 8, 2010 at 2:34 PM, dimitri pater - serpia
> <dimitri.pater at gmail.com> wrote:
>> Hi,
>>
>> I have two related lists:
>> x = [1 ,2, 8, 5, 0, 7]
>> y = ['a', 'a', 'b', 'c', 'c', 'c' ]
>>
>> what I need is a list representing the mean value of 'a', 'b' and 'c'
>> while maintaining the number of items (len):
>> w = [1.5, 1.5, 8, 4, 4, 4]
>>
>> I have looked at iter(tools) and next(), but that did not help me. I'm
>> a bit stuck here, so your help is appreciated!
>
> from __future__ import division
>
> def group(keys, values):
> ? ?#requires None not in keys
> ? ?groups = []
> ? ?cur_key = None
> ? ?cur_vals = None
> ? ?for key, val in zip(keys, values):
> ? ? ? ?if key != cur_key:
> ? ? ? ? ? ?if cur_key is not None:
> ? ? ? ? ? ? ? ?groups.append((cur_key, cur_vals))
> ? ? ? ? ? ?cur_vals = [val]
> ? ? ? ? ? ?cur_key = key
> ? ? ? ?else:
> ? ? ? ? ? ?cur_vals.append(val)
> ? ?groups.append((cur_key, cur_vals))
> ? ?return groups
>
> def average(lst):
> ? ?return sum(lst) / len(lst)
>
> def process(x, y):
> ? ?result = []
> ? ?for key, vals in group(y, x):
> ? ? ? ?avg = average(vals)
> ? ? ? ?for i in xrange(len(vals)):
> ? ? ? ? ? ?result.append(avg)
> ? ?return result
>
> x = [1 ,2, 8, 5, 0, 7]
> y = ['a', 'a', 'b', 'c', 'c', 'c' ]
>
> print process(x, y)
> #=> [1.5, 1.5, 8.0, 4.0, 4.0, 4.0]
>
> It could be tweaked to use itertools.groupby(), but it would probably
> be less efficient/clear.
>
> Cheers,
> Chris
> --
> http://blog.rebertia.com
>



-- 
---
You can't have everything. Where would you put it? -- Steven Wright
---
please visit www.serpia.org


From aahz at pythoncraft.com  Mon Mar  8 20:47:58 2010
From: aahz at pythoncraft.com (Aahz)
Date: 8 Mar 2010 17:47:58 -0800
Subject: Queue peek?
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>
	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>
	<58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>
Message-ID: <hn49ce$fgd$1@panix5.panix.com>

In article <58f61382-ac79-46fb-8612-a3c9fde297dc at c16g2000yqd.googlegroups.com>,
Veloz  <michaelveloz at gmail.com> wrote:
>
>The "peek" parts comes in when the user comes back later to see if
>their report has done. That is, in my page controller logic, I'd like
>to look through the complete queue and see if the specific report has
>been finished (I could tell by matching up the ID of the original
>request to the ID in the completed queue). If there was an item in the
>queue matching the ID, it would be removed.

Here's the question: what happens when the user refreshes the "report
done" page?  The problem with the way you're doing it is that checking
for report done is a one-shot operation.  You probably want to use a
database to cache this and have some kind of cache expiration.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From jjposner at optimum.net  Mon Mar  8 21:39:59 2010
From: jjposner at optimum.net (John Posner)
Date: Mon, 08 Mar 2010 21:39:59 -0500
Subject: related lists mean value
In-Reply-To: <mailman.470.1268087649.23598.python-list@python.org>
References: <mailman.470.1268087649.23598.python-list@python.org>
Message-ID: <4B95B4FF.1070407@optimum.net>

On 3/8/2010 5:34 PM, dimitri pater - serpia wrote:
> Hi,
>
> I have two related lists:
> x = [1 ,2, 8, 5, 0, 7]
> y = ['a', 'a', 'b', 'c', 'c', 'c' ]
>
> what I need is a list representing the mean value of 'a', 'b' and 'c'
> while maintaining the number of items (len):
> w = [1.5, 1.5, 8, 4, 4, 4]
>
> I have looked at iter(tools) and next(), but that did not help me. I'm
> a bit stuck here, so your help is appreciated!

Nobody expects object-orientation (or the Spanish Inquisition):

#-------------------------
from collections import defaultdict

class Tally:
     def __init__(self, id=None):
         self.id = id
         self.total = 0
         self.count = 0

x = [1 ,2, 8, 5, 0, 7]
y = ['a', 'a', 'b', 'c', 'c', 'c']

# gather data
tally_dict = defaultdict(Tally)
for i in range(len(x)):
     obj = tally_dict[y[i]]
     obj.id = y[i]
     obj.total += x[i]
     obj.count += 1

# process data
result_list = []
for key in sorted(tally_dict):
     obj = tally_dict[key]
     mean = 1.0 * obj.total / obj.count
     result_list.extend([mean] * obj.count)
print result_list
#-------------------------

-John


From jjposner at optimum.net  Mon Mar  8 21:43:58 2010
From: jjposner at optimum.net (John Posner)
Date: Mon, 08 Mar 2010 21:43:58 -0500
Subject: related lists mean value
In-Reply-To: <4B95B4FF.1070407@optimum.net>
References: <mailman.470.1268087649.23598.python-list@python.org>
	<4B95B4FF.1070407@optimum.net>
Message-ID: <4B95B5EE.90302@optimum.net>

On 3/8/2010 9:39 PM, John Posner wrote:

<snip>

> # gather data
> tally_dict = defaultdict(Tally)
> for i in range(len(x)):
> obj = tally_dict[y[i]]
> obj.id = y[i]                 <--- statement redundant, remove it
> obj.total += x[i]
> obj.count += 1

-John




From jjposner at optimum.net  Mon Mar  8 21:53:41 2010
From: jjposner at optimum.net (John Posner)
Date: Mon, 08 Mar 2010 21:53:41 -0500
Subject: related lists mean value
In-Reply-To: <4B95B5EE.90302@optimum.net>
References: <mailman.470.1268087649.23598.python-list@python.org>
	<4B95B4FF.1070407@optimum.net> <4B95B5EE.90302@optimum.net>
Message-ID: <4B95B835.4050805@optimum.net>

On 3/8/2010 9:43 PM, John Posner wrote:
> On 3/8/2010 9:39 PM, John Posner wrote:
>
> <snip>

>> obj.id = y[i] <--- statement redundant, remove it

Sorry for the thrashing! It's more correct to say that the Tally class 
doesn't require an "id" attribute at all. So the code becomes:

#---------
from collections import defaultdict

class Tally:
     def __init__(self):
         self.total = 0
         self.count = 0

x = [1 ,2, 8, 5, 0, 7]
y = ['a', 'a', 'b', 'c', 'c', 'c']

# gather data
tally_dict = defaultdict(Tally)
for i in range(len(x)):
     obj = tally_dict[y[i]]
     obj.total += x[i]
     obj.count += 1

# process data
result_list = []
for key in sorted(tally_dict):
     obj = tally_dict[key]
     mean = 1.0 * obj.total / obj.count
     result_list.extend([mean] * obj.count)
print result_list
#---------

-John


From df.trash at gmail.com  Mon Mar  8 22:35:50 2010
From: df.trash at gmail.com (tdan)
Date: Mon, 8 Mar 2010 19:35:50 -0800 (PST)
Subject: remove element with ElementTree
Message-ID: <790217d6-e230-44e8-9aa1-4f8c7a66170c@g7g2000yqe.googlegroups.com>

I have been using ElementTree to write an app, and would like to
simply remove an element.
But in ElementTree, you must know both the parent and the child
element to do this.
There is no getparent() function, so I am stuck if I only have an
element.

I am iterating over a table and getting all <td> tags, checking their
text, and conditionally deleting them:

def RemoveElementWithText( topEl, subEl, text ):
	for el in topEl.getiterator( subEl ):
		if el.text = text:
			break
	else:
		el = None
	return el

RemoveElementWithText( table, 'td', 'sometext' )

My table is like so:

<table>
 <thead>...
 <tbody><tr><td>...

Is there any way to do this in ElementTree?  I see lxml.etree does
this nicely, but I want to use python's standard library.


From fox.joe87 at gmail.com  Mon Mar  8 23:13:58 2010
From: fox.joe87 at gmail.com (Joe Fox)
Date: Tue, 9 Mar 2010 09:43:58 +0530
Subject: libc Sleep api performs a busy waiting
In-Reply-To: <hn2qta$886$2@dough.gmane.org>
References: <a52b97c0-7266-4bc6-9ab4-3a8688120a6c@u19g2000prh.googlegroups.com>
	<hn2qta$886$2@dough.gmane.org>
Message-ID: <27e52ad11003082013h658cf7deu761e7d14198af9f1@mail.gmail.com>

Hi,

 actually i have simplified my scenario a lot here ,

In my actual case , i have to call a C-api which blocks on  c select , in a
separate thread.

my thread is getting struck in that api , and thus blocking all the other
threads.
Can you point to something which will help me call this blocking C-api call
without my thread getting struck.


Thanks
Mahesh

On Mon, Mar 8, 2010 at 6:03 PM, Steve Holden <steve at holdenweb.com> wrote:

> Mahesh wrote:
> > Hi,
> >
> >  I am having a problem while using sleep function from libc , the
> > thread in which i am calling it is getting struck and not allowing
> > other threads to execute.  Here is a simple code that i am trying to
> > exeute
> >
> > import threading
> > import time
> > import dl
> >
> >
> > def dummy1():
> >     a=dl.open('/lib/libc.so.6')
> >     print "in thread 1 Start"
> >     a.call('sleep',2)
> >     #time.sleep(2)
> >     print "in thread 1 End"
> >
> > def dummy2():
> >     print "in thread 2 Start"
> >     time.sleep(1)
> >     print "in thread 2 End"
> > newThread1=threading.Thread(None,dummy1)
> > newThread2=threading.Thread(None,dummy2)
> > newThread1.start()
> > newThread2.start()
> >
> > print "in main"
> >
> >
> >
> > The out put of this program is  (In this case thread 1 even though i
> > am calling a sleep function its not allowing other threads to execute,
> > other threads execute only after the completion of first thread)
> >
> > in thread 1 Start
> > in thread 1 End
> > in thread 2 Start
> > in main
> > in thread 2 End
> >
> >
> > where as if i use time.sleep instead of a.call(sleep) the out put is
> > (which i guess is right behaviour, because it start the threads and
> > suspends them because the have sleep , and continue executing the main
> > thread)
> > in thread 1 Start
> > in thread 2 Start
> > in main
> > in thread 2 End
> > in thread 1 End
> >
> >
> Why not just use the time module's sleep function? Unlike the libc code
> it releases Python's GIL (global interpreter lock), thus allowing other
> threads to run.
>
> regards
>  Steve
> --
> Steve Holden           +1 571 484 6266   +1 800 494 3119
> PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
> Holden Web LLC                 http://www.holdenweb.com/
> UPCOMING EVENTS:        http://holdenweb.eventbrite.com/
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From mehgcap at gmail.com  Mon Mar  8 23:22:27 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Mon, 8 Mar 2010 23:22:27 -0500
Subject: imported var not being updated
Message-ID: <bc7f680c1003082022k4b1dd708i1d6e17cdf05db563@mail.gmail.com>

Hello all:
I have a project with many pyw files. One file holds a variable and a
function that I find myself using across many other pyw files, so I
called it helpers.pyw. The variable is "mostRecent", which is a string
and is meant to hold a string so I know what the program most recently
output; in all the other pyw files, every time the program outputs
something, I include the line
helpers.mostRecent=output
where output is a string and helpers has been imported.

The problem is that mostRecent does not seem to be updated at all, and
I cannot figure out why. I declare it with empty quotes initially, but
the program should keep updating it. Everytime I go to see what its
value is, though, it is still apparently empty. Here is a basic
sample:

randomFile.pyw
---
import helpers

def something():
  output="I am the most recently output string!"
  helpers.mostRecent=output
#end def

file2.pyw
---
from helpers import mostRecent

print(mostRecent) #prints nothing

Any thoughts on what I am doing wrong? Thanks!!

-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From gherron at islandtraining.com  Mon Mar  8 23:55:01 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Mon, 08 Mar 2010 20:55:01 -0800
Subject: imported var not being updated
In-Reply-To: <bc7f680c1003082022k4b1dd708i1d6e17cdf05db563@mail.gmail.com>
References: <bc7f680c1003082022k4b1dd708i1d6e17cdf05db563@mail.gmail.com>
Message-ID: <4B95D4A5.6050504@islandtraining.com>

Alex Hall wrote:
> Hello all:
> I have a project with many pyw files. One file holds a variable and a
> function that I find myself using across many other pyw files, so I
> called it helpers.pyw. The variable is "mostRecent", which is a string
> and is meant to hold a string so I know what the program most recently
> output; in all the other pyw files, every time the program outputs
> something, I include the line
> helpers.mostRecent=output
> where output is a string and helpers has been imported.
>
> The problem is that mostRecent does not seem to be updated at all, and
> I cannot figure out why. I declare it with empty quotes initially, but
> the program should keep updating it. Everytime I go to see what its
> value is, though, it is still apparently empty. Here is a basic
> sample:
>
> randomFile.pyw
> ---
> import helpers
>
> def something():
>   output="I am the most recently output string!"
>   helpers.mostRecent=output
> #end def
>
> file2.pyw
> ---
> from helpers import mostRecent
>
> print(mostRecent) #prints nothing
>
> Any thoughts on what I am doing wrong? Thanks!!
>   

The form of import you are using
    from helpers import mostRecent
makes a *new* binding to the value in the module that's doing the 
import.  Rebinding the var in a different module does not affect this.  
It's similar to this:

    a = 'string'
    b = a
    a = 'another string'

won't affect b's value.

What you can do, is not make a separate binding, but reach into the 
helpers module to get the value there.  Like this:

    import helpers
    print helpers.mostRecent

That will work as you hope.

Gary Herron




From mehgcap at gmail.com  Mon Mar  8 23:59:00 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Mon, 8 Mar 2010 23:59:00 -0500
Subject: imported var not being updated
In-Reply-To: <4B95D4A5.6050504@islandtraining.com>
References: <bc7f680c1003082022k4b1dd708i1d6e17cdf05db563@mail.gmail.com>
	<4B95D4A5.6050504@islandtraining.com>
Message-ID: <bc7f680c1003082059y33171178gb88ce72b8fb3ad9b@mail.gmail.com>

Thanks, it worked as expected. I guess I figured that Python would
read my mind and realize that I wanted mostRecent to act globally for
the program, imported as a copy or accessed in its own namespace
(right term?) Oh well, the day computers can read thoughts like that
is the day programmers are out of a job... Thanks again.

On 3/8/10, Gary Herron <gherron at islandtraining.com> wrote:
> Alex Hall wrote:
>> Hello all:
>> I have a project with many pyw files. One file holds a variable and a
>> function that I find myself using across many other pyw files, so I
>> called it helpers.pyw. The variable is "mostRecent", which is a string
>> and is meant to hold a string so I know what the program most recently
>> output; in all the other pyw files, every time the program outputs
>> something, I include the line
>> helpers.mostRecent=output
>> where output is a string and helpers has been imported.
>>
>> The problem is that mostRecent does not seem to be updated at all, and
>> I cannot figure out why. I declare it with empty quotes initially, but
>> the program should keep updating it. Everytime I go to see what its
>> value is, though, it is still apparently empty. Here is a basic
>> sample:
>>
>> randomFile.pyw
>> ---
>> import helpers
>>
>> def something():
>>   output="I am the most recently output string!"
>>   helpers.mostRecent=output
>> #end def
>>
>> file2.pyw
>> ---
>> from helpers import mostRecent
>>
>> print(mostRecent) #prints nothing
>>
>> Any thoughts on what I am doing wrong? Thanks!!
>>
>
> The form of import you are using
>     from helpers import mostRecent
> makes a *new* binding to the value in the module that's doing the
> import.  Rebinding the var in a different module does not affect this.
> It's similar to this:
>
>     a = 'string'
>     b = a
>     a = 'another string'
>
> won't affect b's value.
>
> What you can do, is not make a separate binding, but reach into the
> helpers module to get the value there.  Like this:
>
>     import helpers
>     print helpers.mostRecent
>
> That will work as you hope.
>
> Gary Herron
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From gagsl-py2 at yahoo.com.ar  Tue Mar  9 01:03:36 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 09 Mar 2010 03:03:36 -0300
Subject: How to determine if threads are active in an application?
References: <1267222230.24180.1362126901@webmail.messagingengine.com>
Message-ID: <op.u9adsaqdx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 26 Feb 2010 19:10:30 -0300, <python at bdurham.com> escribi?:

> Is there technique to determine if threads are active in a Python
> application?
>
> The only technique I can think of is to check sys.modules for
> thread and threading. But this will only show whether these
> modules were imported - not whether there are actually background
> threads running.

I've just read your post.
Look at threading.activeCount() - this returns only those threads created  
using the threading module. If that's not enough, you'll have to use some  
OS-specific functions.

-- 
Gabriel Genellina



From see at sig.for.address  Tue Mar  9 01:14:37 2010
From: see at sig.for.address (Victor Eijkhout)
Date: Tue, 9 Mar 2010 00:14:37 -0600
Subject: scipy sparse matrix question
Message-ID: <1jf28jr.7abra61nwu04pN%see@sig.for.address>

I can't find any detailed information about scipy.sparse.

My specific question: what does "for x in A" give me when A is a sparse
matrix? It seems to yield all nonzero locations, but in what kind of
form? Very specifically: how do I get the (i,j) coordinates and the
value from x?

Victor.

-- 
Victor Eijkhout -- eijkhout at tacc utexas edu


From casevh at gmail.com  Tue Mar  9 01:39:30 2010
From: casevh at gmail.com (casevh)
Date: Mon, 8 Mar 2010 22:39:30 -0800 (PST)
Subject: Calculating very large exponents in python
References: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>
	<f3cc57c61003071240x18b580bend946824ef7955b6c@mail.gmail.com> 
	<COL110-W1236CED756D3C9374CB0A2B7350@phx.gbl>
	<mailman.466.1268075137.23598.python-list@python.org>
Message-ID: <90e5f42d-b0d0-4578-82ea-9d0e5770048b@k2g2000pro.googlegroups.com>

[also replying to Geremy since the OP's message doesn't appear...]

On Mar 8, 11:05?am, geremy condra <debat... at gmail.com> wrote:
> On Mon, Mar 8, 2010 at 2:15 AM, Fahad Ahmad <miracles... at hotmail.com> wrote:
> > Thanks Geremy,
>
> > That has been an absolute bump........... GOD i cant sit on my chair, it has
> > worked even on 512 bit number and with no time..........
> > superb i would say.
>
> > lastly, i am using the code below to calculate Largest Prime factor of a
> > number:
>
> > print
> > ('''=======================================================================?========'''
> > ?????? '''????????????? CALCULATE? HIGHEST PRIME
> > FACTOR????????????????????????????????? '''
>
> > '''========================================================================?=======''')
>
> > #!/usr/bin/env python
> > def highest_prime_factor(n):
> > ?? if isprime(n):
> > ????? return n
> > ?? for x in xrange(2,n ** 0.5 + 1):
> > ????? if not n % x:
> > ???????? return highest_prime_factor(n/x)
> > def isprime(n):
> > ?? for x in xrange(2,n ** 0.5 + 1):
> > ????? if not n % x:
> > ???????? return False
> > ?? return True
> > if? __name__ == "__main__":
> > ?? import time
> > ?? start = time.time()
> > ?? print highest_prime_factor(1238162376372637826)
> > ?? print time.time() - start
>
> > the code works with a bit of delay on the number : "1238162376372637826" but
> > extending it to
> > (10902610991329142436630551158108608965062811746392577675456004845499113044?304710902610991329142436630551158108608965062811746392577675456004845499113?0443047)
> > ?makes python go crazy. Is there any way just like above, i can have it
> > calculated it in no time.
>
> > thanks for the support.
>
> If you're just looking for the largest prime factor I would suggest using
> a fermat factorization attack. In the example you gave, it returns
> nearly immediately.
>
> Geremy Condra- Hide quoted text -
>
> - Show quoted text -

For a Python-based solution, you might want to look at pyecm (http://
sourceforge.net/projects/pyecm/)

On a system with gmpy installed also, pyecm found the following
factors:

101, 521, 3121, 9901, 36479, 300623, 53397071018461,
1900381976777332243781

There still is a 98 digit unfactored composite:

60252507174568243758911151187828438446814447653986842279796823262165159406500174226172705680274911

Factoring this remaining composite using ECM may not be practical.

casevh


From faheem_imt at yahoo.com  Tue Mar  9 02:51:57 2010
From: faheem_imt at yahoo.com (Faheem)
Date: Mon, 8 Mar 2010 23:51:57 -0800 (PST)
Subject: How to detect C Function block using python
Message-ID: <769249.71022.qm@web62401.mail.re1.yahoo.com>


Hey All,
I'm new in this community. I am?writing?a static?analyzer?for validating C Code using python and for that?I'm looking for a python module/API that will detect Function block of a given C-File.?I know simple function can be detected using push "{" and poping it if character "}" is found. This solution is actually done already, I want a robust API that can do more then that like detecting Function name parameters its return types etc.
Thanks!Faheem  




      
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From vinay_sajip at yahoo.co.uk  Tue Mar  9 03:17:51 2010
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Tue, 9 Mar 2010 00:17:51 -0800 (PST)
Subject: Conditional based on whether or not a module is being used
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
	<50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com> 
	<14a5cd5e1003051225j1d596aa2nfe9eb1047037f19d@mail.gmail.com> 
	<mailman.383.1267823696.23598.python-list@python.org>
	<f4de1c96-502a-42e7-b647-ce52d0f76f2f@u15g2000prd.googlegroups.com>
	<29c6a957-5028-4c2d-8594-6c4db8243ef2@d2g2000yqa.googlegroups.com> 
	<mailman.422.1267965329.23598.python-list@python.org>
Message-ID: <42062deb-785a-4955-9ce0-d9fb7a26455d@j27g2000yqn.googlegroups.com>

On Mar 7, 12:34?pm, Steve Holden <st... at holdenweb.com> wrote:
> My own impression of theloggingmodule, formed from trying to use its
> documentation in the past, is that it's somewhat unapproachable, and
> difficult to use for simple purposes.
>
> I am happy to say that now I see the current (3.1) documentation it has
> improved to the point where I would be happy to try using it again.
> Thanks for your long-term maintenance of this package.
>

Hi Steve,

Thanks for the positive feedback. The initial documentation for the
logging package, because it lives in the library section of the
overall documentation, was focused more on completeness of coverage
for reference usage, rather than a more tutorial-based approach.
Thanks to work by Doug Hellmann and others, the documentation has
grown, over time, more accessible to Python novices. It's still not
perfect, and I hope to be able to improve its clarity in the future,
by getting help where possible from people who are better at technical
writing than I am.

I'm reviewing the documentation at the moment, as it happens, and it
still seems hard to be able to put together a structure which is good
for everyone. A full treatment, it seems to me, would talk a little
about the detail of why things work as they do; but a lot of the time,
people are just interested in getting going with the package, and less
interested in the whys and wherefores. But for people trying to do
more than the basics, that deeper understanding is sometimes
necessary. The hard part is satisfying all audiences in one document!

Regards,

Vinay Sajip


From stephane at harobed.org  Tue Mar  9 03:30:05 2010
From: stephane at harobed.org (KLEIN =?iso-8859-1?q?St=E9phane?=)
Date: Tue, 9 Mar 2010 08:30:05 +0000 (UTC)
Subject: Are there in Python some static web site generating tools like
	webgen, nanoc or webby in Ruby ?
Message-ID: <hn50ud$27u$1@dough.gmane.org>

Hi,

Today, I've show this static web site generating tools writed in ruby :

 * http://webgen.rubyforge.org/index.html
 * http://nanoc.stoneship.org/about/
 * http://webby.rubyforge.org/tutorial/

I like this tools, I'm wonder if there are similar tools in Python ?

I know Sphinx, but this tools is oriented documentation.

Thanks for your information,
Stephane



From kishoreinme at gmail.com  Tue Mar  9 03:39:15 2010
From: kishoreinme at gmail.com (kishore)
Date: Tue, 9 Mar 2010 00:39:15 -0800 (PST)
Subject: pyserial script doesnt execute properly
Message-ID: <c083a958-7320-4fd3-82ae-cf4da7808af6@u15g2000prd.googlegroups.com>

hello there

Iam using python 2.5.4
pyserial  2.4
pywin32-214

on windows 7


i hav a small test script written to query a serial device (arduino)
and get back reply appropriately



////file: test.py

import serial
print 'hi'
ser=serial.Serial(port='\\.\COM2', baudrate=9600)
ser.close()
ser.open()
ser.write('1')
ser.readline()
ser.readline()
ser.close()



the device waits for '1' through its serial interface and print two
lines if it gets '1'

"Some Data found" and "Header received"


the script works on IDLE well when given one line at a time

but when given in command line as python test.py it prints hi and wait
forever

can anyone help?
thanks in advance



From vinay_sajip at yahoo.co.uk  Tue Mar  9 03:54:03 2010
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Tue, 9 Mar 2010 00:54:03 -0800 (PST)
Subject: Conditional based on whether or not a module is being used
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
	<50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com> 
	<14a5cd5e1003051225j1d596aa2nfe9eb1047037f19d@mail.gmail.com> 
	<mailman.383.1267823696.23598.python-list@python.org>
	<f4de1c96-502a-42e7-b647-ce52d0f76f2f@u15g2000prd.googlegroups.com>
	<29c6a957-5028-4c2d-8594-6c4db8243ef2@d2g2000yqa.googlegroups.com> 
	<9c6a8d26-b71e-4cb8-92d0-49af8728bec4@u15g2000prd.googlegroups.com>
Message-ID: <80645b57-b586-400e-8a8d-0ec97f3c8455@b30g2000yqd.googlegroups.com>

On Mar 6, 11:13 pm, Pete Emerson <pemer... at gmail.com> wrote:
>
> 1) In debug mode, send what would have gone to syslog to STDOUT or
> STDERR
> 2) In non-debug mode, use /dev/log or localhost:514 depending on what
> is set
> 3) Allow for multiple levels ofloggingbeyond INFO, WARNING, CRIT ...
> essentially allow multiple levels of INFO depending on how much detail
> is desired.  A high level of messaging when programs are running
> poorly is desired, but when programs are running smoothly, I don't
> need to send as much to syslog.


By "debug mode", do you mean the value of the __debug__ variable, or
something else (e.g. a flag in your application)?

You could certainly do something like (in your logging initialization
code):

if __debug__:
   handler = logging.StreamHandler()
else:
   #use domain socket, UDP, etc.
   handler = logging.handlers.SocketHandler(...)
logger.addHandler(handler)

where logger is the root logger or some other high-level logger in
your application.

By the way, are you aware that accessing syslog via openlog etc. may
not thread-safe, at least in some environments? Search the Web for
"syslog openlog thread" for more info.

You can certainly add additional levels to logging (see addLevelName),
but I'm not sure that's what you really need. Generally, I find that
when there are problems to be debugged, I get more benefits from using
the logger hierarchy: I keep the level at logging.DEBUG but just log
different things to different loggers. Just as a fr'instance, if I
were logging the parsing of HTTP requests, I might use loggers named
'request', 'request.headers', 'request.headers.cookies',
'request.body', 'request.body.multipart' etc. When everything is
working well, I have the verbosity of these loggers turned low by e.g.
setting the level for the 'request' logger to WARNING or higher; when
I want to debug header processing in more detail I might set the level
of the 'request.headers' logger to DEBUG, which would output events
from request header processing (but not the body), or just turn up the
'request.headers.cookies' level to look in more detail at what's
happening during processing "Cookie:" headers.

Regards,

Vinay Sajip


From stephane at harobed.org  Tue Mar  9 03:57:32 2010
From: stephane at harobed.org (KLEIN =?ISO-8859-1?Q?St=E9phane?=)
Date: Tue, 09 Mar 2010 09:57:32 +0100
Subject: Are there in Python some static web site generating tools like
	webgen, nanoc or webby in Ruby ?
Message-ID: <1268125052.7405.1.camel@stephane-macbook>

Hi,

Today, I've show this static web site generating tools write in ruby :

 * http://webgen.rubyforge.org/index.html
 * http://nanoc.stoneship.org/about/
 * http://webby.rubyforge.org/tutorial/

I like this tools, I'm wonder if there are similar tools in Python ?

I know Sphinx, but this tools is oriented documentation.

Thanks for your information,
Stephane

-- 
St?phane Klein <stephane at harobed.org>
Blog : http://harobed.org 
Jabber : stephane.klein at jabber.fr



From news123 at free.fr  Tue Mar  9 04:19:56 2010
From: news123 at free.fr (News123)
Date: Tue, 09 Mar 2010 10:19:56 +0100
Subject: pyserial script doesnt execute properly
In-Reply-To: <c083a958-7320-4fd3-82ae-cf4da7808af6@u15g2000prd.googlegroups.com>
References: <c083a958-7320-4fd3-82ae-cf4da7808af6@u15g2000prd.googlegroups.com>
Message-ID: <4b9612bc$0$6059$426a74cc@news.free.fr>

Hi,

kishore wrote:
> hello there
> 
> Iam using python 2.5.4
> pyserial  2.4
> pywin32-214
> 
> on windows 7
> 
> 
> i hav a small test script written to query a serial device (arduino)
> and get back reply appropriately
> 
> 
> 
> ////file: test.py
> 
> import serial
> print 'hi'
> ser=serial.Serial(port='\\.\COM2', baudrate=9600)
> ser.close()
> ser.open()
> ser.write('1')
> ser.readline()
> ser.readline()
> ser.close()
> 
> 
> 
> the device waits for '1' through its serial interface and print two
> lines if it gets '1'
> 
> "Some Data found" and "Header received"
> 
> 
> the script works on IDLE well when given one line at a time
> 
> but when given in command line as python test.py it prints hi and wait
> forever
> 


Unfortunately I don't remember exacty, but try following:

close IDLE and try then to start the script from the command line.
I remember having had a problem with idle, that it did not always close
the UART port
(especially, when an error (e.g. syntax) occured before the close statement)


bye

N



From justin.mailinglists at gmail.com  Tue Mar  9 04:34:52 2010
From: justin.mailinglists at gmail.com (Justin Ezequiel)
Date: Tue, 9 Mar 2010 01:34:52 -0800 (PST)
Subject: remove element with ElementTree
References: <790217d6-e230-44e8-9aa1-4f8c7a66170c@g7g2000yqe.googlegroups.com>
Message-ID: <8ad6319f-97f1-46b7-b89e-d455bd89ad03@b9g2000pri.googlegroups.com>

On Mar 9, 11:35?am, tdan <df.tr... at gmail.com> wrote:
> I have been using ElementTree to write an app, and would like to
> simply remove an element.
> But in ElementTree, you must know both the parent and the child
> element to do this.
> There is no getparent() function, so I am stuck if I only have an
> element.
>

see http://effbot.org/zone/element.htm#accessing-parents


From dorzey at googlemail.com  Tue Mar  9 05:21:49 2010
From: dorzey at googlemail.com (dorzey)
Date: Tue, 9 Mar 2010 02:21:49 -0800 (PST)
Subject: Are there in Python some static web site generating tools like 
	webgen, nanoc or webby in Ruby ?
References: <mailman.481.1268125066.23598.python-list@python.org>
Message-ID: <058ebe77-de1b-4814-917a-57e6e65e2d03@t23g2000yqt.googlegroups.com>

On Mar 9, 8:57?am, KLEIN St?phane <steph... at harobed.org> wrote:
> Hi,
>
> Today, I've show this static web site generating tools write in ruby :
>
> ?*http://webgen.rubyforge.org/index.html
> ?*http://nanoc.stoneship.org/about/
> ?*http://webby.rubyforge.org/tutorial/
>
> I like this tools, I'm wonder if there are similar tools in Python ?
>
> I know Sphinx, but this tools is oriented documentation.
>
> Thanks for your information,
> Stephane

I'm only aware of Hyde (http://ringce.com/hyde)

Paul


From spamfresser at ch3ka.de  Tue Mar  9 05:30:26 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Tue, 09 Mar 2010 11:30:26 +0100
Subject: related lists mean value
In-Reply-To: <mailman.470.1268087649.23598.python-list@python.org>
References: <mailman.470.1268087649.23598.python-list@python.org>
Message-ID: <hn5801$sps$1@news.urz.uni-heidelberg.de>

Am 08.03.2010 23:34, schrieb dimitri pater - serpia:
> Hi,
>
> I have two related lists:
> x = [1 ,2, 8, 5, 0, 7]
> y = ['a', 'a', 'b', 'c', 'c', 'c' ]
>
> what I need is a list representing the mean value of 'a', 'b' and 'c'
> while maintaining the number of items (len):
> w = [1.5, 1.5, 8, 4, 4, 4]

This kinda looks like you used the wrong data structure.
Maybe you should have used a dict, like:
{'a': [1, 2], 'c': [5, 0, 7], 'b': [8]} ?

> I have looked at iter(tools) and next(), but that did not help me. I'm
> a bit stuck here, so your help is appreciated!

As said, I'd have used a dict in the first place, so lets transform this 
straight forward into one:

x = [1 ,2, 8, 5, 0, 7]
y = ['a', 'a', 'b', 'c', 'c', 'c' ]

# initialize dict
d={}
for idx in set(y):
     d[idx]=[]

#collect values
for i, idx in enumerate(y):
     d[idx].append(x[i])

print("d is now a dict of lists: %s" % d)

#calculate average
for key, values in d.items():
     d[key]=sum(values)/len(values)

print("d is now a dict of averages: %s" % d)

# build the final list
w = [ d[key] for key in y ]

print("w is now the list of averages, corresponding with y:\n \
         \n x: %s \n y: %s \n w: %s \n" % (x, y, w))


Output is:
d is now a dict of lists: {'a': [1, 2], 'c': [5, 0, 7], 'b': [8]}
d is now a dict of averages: {'a': 1.5, 'c': 4.0, 'b': 8.0}
w is now the list of averages, corresponding with y:

  x: [1, 2, 8, 5, 0, 7]
  y: ['a', 'a', 'b', 'c', 'c', 'c']
  w: [1.5, 1.5, 8.0, 4.0, 4.0, 4.0]

Could have used a defaultdict to avoid dict initialisation, though.
Or write a custom class:

x = [1 ,2, 8, 5, 0, 7]
y = ['a', 'a', 'b', 'c', 'c', 'c' ]

class A:
     def __init__(self):
         self.store={}
     def add(self, key, number):
         if key in self.store:
             self.store[key].append(number)
         else:
             self.store[key] = [number]
a=A()

# collect data
for idx, val in zip(y,x):
     a.add(idx, val)

# build the final list:
w = [ sum(a.store[key])/len(a.store[key]) for key in y ]

print("w is now the list of averages, corresponding with y:\n \
         \n x: %s \n y: %s \n w: %s \n" % (x, y, w))

Produces same output, of course.

Note that those solutions are both not very efficient, but who cares ;)

> thanks!

No Problem,

Michael


From javier.collado at gmail.com  Tue Mar  9 05:43:05 2010
From: javier.collado at gmail.com (Javier Collado)
Date: Tue, 9 Mar 2010 11:43:05 +0100
Subject: Are there in Python some static web site generating tools like 
	webgen, nanoc or webby in Ruby ?
In-Reply-To: <058ebe77-de1b-4814-917a-57e6e65e2d03@t23g2000yqt.googlegroups.com>
References: <mailman.481.1268125066.23598.python-list@python.org> 
	<058ebe77-de1b-4814-917a-57e6e65e2d03@t23g2000yqt.googlegroups.com>
Message-ID: <c83cde5a1003090243x4ee56e8vb8d5794649cb3ece@mail.gmail.com>

> I'm only aware of Hyde (http://ringce.com/hyde)

There are also jekyll and cyrax:
http://github.com/mojombo/jekyll/
http://pypi.python.org/pypi/cyrax/0.1.5

I haven't tried any of them, but it looks like cyrax is in active
development and its design was inspired in both jekyll and hyde.

Best regards,
    Javier


From spamfresser at ch3ka.de  Tue Mar  9 06:11:35 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Tue, 09 Mar 2010 12:11:35 +0100
Subject: related lists mean value (golfed)
In-Reply-To: <hn5801$sps$1@news.urz.uni-heidelberg.de>
References: <mailman.470.1268087649.23598.python-list@python.org>
	<hn5801$sps$1@news.urz.uni-heidelberg.de>
Message-ID: <hn5ad7$t8a$1@news.urz.uni-heidelberg.de>

OK, I golfed it :D
Go ahead and kill me ;)

x = [1 ,2, 8, 5, 0, 7]
y = ['a', 'a', 'b', 'c', 'c', 'c' ]

def f(a,b,v={}):
     try: v[a].append(b)
     except: v[a]=[b]
     def g(a): return sum(v[a])/len(v[a])
     return g
w = [g(i) for g,i in [(f(i,v),i) for i,v in zip(y,x)]]

print("w is now the list of averages, corresponding with y:\n \
         \n x: %s \n y: %s \n w: %s \n" % (x, y, w))

Output:
w is now the list of averages, corresponding with y:

  x: [1, 2, 8, 5, 0, 7]
  y: ['a', 'a', 'b', 'c', 'c', 'c']
  w: [1.5, 1.5, 8.0, 4.0, 4.0, 4.0]

Regards,
Michael


From steve at holdenweb.com  Tue Mar  9 06:18:06 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 09 Mar 2010 06:18:06 -0500
Subject: What to do if anything bites.
In-Reply-To: <4b957998$0$17135$426a34cc@news.free.fr>
References: <dbf9320f-a9b9-492c-9a5e-c687422c1464@y7g2000prc.googlegroups.com>
	<4b957998$0$17135$426a34cc@news.free.fr>
Message-ID: <hn5aps$vsv$1@dough.gmane.org>

News123 wrote:
> Google Adsense wrote:
>> What to do if anything bites.
>>
>> Check our bites treatment at
>>
>> http://...
> 
> Pythons don't bite

First, if you have to respond to spam please omit the URL that the
spammer is trying to bring to Google's attention as well as direct readers.

Secondly, do you realise you are posting from an address that has been
"suspended due to inactivity"? Otherwise you would have received this
message privately.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From bob at leaddevice.com  Tue Mar  9 06:23:59 2010
From: bob at leaddevice.com (BobAalsma)
Date: Tue, 9 Mar 2010 03:23:59 -0800 (PST)
Subject: Newbie question: python versions differ per user?
References: <8a04bbfd-9c48-4397-8c81-c159dc1b8977@33g2000yqj.googlegroups.com>
Message-ID: <d813abae-f312-4932-9654-f6df83c773c0@t20g2000yqe.googlegroups.com>

On Mar 8, 8:15?pm, BobAalsma <bob.aal... at aalsmacons.nl> wrote:
> I'm on Mac OS X 10.5.8 and downloaded 2.6.4 Mac Installer Disk Image
> as/in(?) the sys admin user. For this user Pyhton 2.6.4 is now the
> current version.
> I want to use Python outside the sys asdmin user. However, all other
> users still use Python 2.5.1 (Apple delivered).
>
> The sys admin user looks in /Library/Frameworks/Python.framework/
> Versions/2.6/lib/...
> The other users look in ? ? ? ?/System/Library/Frameworks/
> Python.framework/Version/2.5/lib/...
>
> I could not find any questions on this matter, so am I the only one?
> Did I do something wrong?
> I assumed the paths for all users would be modified - too easy?

OK, sorry, found out.


From garabik-news-2005-05 at kassiopeia.juls.savba.sk  Tue Mar  9 06:28:23 2010
From: garabik-news-2005-05 at kassiopeia.juls.savba.sk (garabik-news-2005-05 at kassiopeia.juls.savba.sk)
Date: Tue, 9 Mar 2010 11:28:23 +0000 (UTC)
Subject: Are there in Python some static web site generating tools
	like?webgen, nanoc or webby in Ruby ?
References: <mailman.481.1268125066.23598.python-list@python.org>
Message-ID: <hn5bcn$odr$1@speranza.aioe.org>

KLEIN St?phane <stephane at harobed.org> wrote:
> Hi,
> 
> Today, I've show this static web site generating tools write in ruby :
> 
> * http://webgen.rubyforge.org/index.html
> * http://nanoc.stoneship.org/about/
> * http://webby.rubyforge.org/tutorial/
> 
> I like this tools, I'm wonder if there are similar tools in Python ?
>

rst2web
 

-- 
 -----------------------------------------------------------
| Radovan Garab?k http://kassiopeia.juls.savba.sk/~garabik/ |
| __..--^^^--..__    garabik @ kassiopeia.juls.savba.sk     |
 -----------------------------------------------------------
Antivirus alert: file .signature infected by signature virus.
Hi! I'm a signature virus! Copy me into your signature file to help me spread!


From __peter__ at web.de  Tue Mar  9 07:02:12 2010
From: __peter__ at web.de (Peter Otten)
Date: Tue, 09 Mar 2010 13:02:12 +0100
Subject: related lists mean value (golfed)
References: <mailman.470.1268087649.23598.python-list@python.org>
	<hn5801$sps$1@news.urz.uni-heidelberg.de>
	<hn5ad7$t8a$1@news.urz.uni-heidelberg.de>
Message-ID: <hn5dbo$ih6$02$1@news.t-online.com>

Michael Rudolf wrote:

> OK, I golfed it :D
> Go ahead and kill me ;)
> 
> x = [1 ,2, 8, 5, 0, 7]
> y = ['a', 'a', 'b', 'c', 'c', 'c' ]
> 
> def f(a,b,v={}):
>      try: v[a].append(b)
>      except: v[a]=[b]
>      def g(a): return sum(v[a])/len(v[a])
>      return g
> w = [g(i) for g,i in [(f(i,v),i) for i,v in zip(y,x)]]
> 
> print("w is now the list of averages, corresponding with y:\n \
>          \n x: %s \n y: %s \n w: %s \n" % (x, y, w))
> 
> Output:
> w is now the list of averages, corresponding with y:
> 
>   x: [1, 2, 8, 5, 0, 7]
>   y: ['a', 'a', 'b', 'c', 'c', 'c']
>   w: [1.5, 1.5, 8.0, 4.0, 4.0, 4.0]

>>> [sum(a for a,b in zip(x,y) if b==c)/y.count(c)for c in y]
[1.5, 1.5, 8.0, 4.0, 4.0, 4.0]

Peter


From dr.cg at 126.com  Tue Mar  9 07:19:22 2010
From: dr.cg at 126.com (CHEN Guang)
Date: Tue, 9 Mar 2010 20:19:22 +0800 (CST)
Subject: How to detect C Function block using python
Message-ID: <19912fa.87bc.12742dd77f8.Coremail.dr.cg@126.com>

In the source code of PythoidC ( http://pythoidc.googlecode.com ), I wrote a Parser for C header files with Python regular expression, not only functions but also structs macros. May be of some help. 
 

Hey All, 


I'm new in this community. I am writing a static analyzer for validating C Code using python and for that I'm looking for a python module/API that will detect Function block of a given C-File. I know simple function can be detected using push "{" and poping it if character "}" is found. This solution is actually done already, I want a robust API that can do more then that like detecting Function name parameters its return types etc.


Thanks!
Faheem
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From yinon.me at gmail.com  Tue Mar  9 07:27:59 2010
From: yinon.me at gmail.com (Yinon Ehrlich)
Date: Tue, 9 Mar 2010 04:27:59 -0800 (PST)
Subject: Duplicate keys in dict?
References: <21f87f60-fea2-417a-a092-64363b5b280e@y11g2000yqh.googlegroups.com>
Message-ID: <98e3cd64-063c-47e1-b671-04fd3fa16c71@z11g2000yqz.googlegroups.com>

On Mar 7, 6:23?pm, vsoler <vicente.so... at gmail.com> wrote:
> Hello,
>
> My code snippet reads data from excel ranges. First row and first
> column are column headers and row headers respectively. After reding
> the range I build a dict.
>
> What is the best approach for this problem? Can anybody help?

Have you tried xlread ? (http://www.python-excel.org/)
Best,
--  Yinon


From efiish at gmail.com  Tue Mar  9 08:51:05 2010
From: efiish at gmail.com (Lan Qing)
Date: Tue, 9 Mar 2010 21:51:05 +0800
Subject: a newbie's question
Message-ID: <ee9ad2071003090551v5def00c6jd04eef99f4545d20@mail.gmail.com>

Hi all,
      I'm a newbie of python programming language. I have used c/c++ for 5
years, and one year experience in Lua programming language. Can any one give
me some advice on learning python. Think you for any help!!

best regards!!!
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From casevh at gmail.com  Tue Mar  9 08:54:15 2010
From: casevh at gmail.com (casevh)
Date: Tue, 9 Mar 2010 05:54:15 -0800 (PST)
Subject: Calculating very large exponents in python
References: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>
	<f3cc57c61003071240x18b580bend946824ef7955b6c@mail.gmail.com> 
	<COL110-W1236CED756D3C9374CB0A2B7350@phx.gbl>
	<mailman.466.1268075137.23598.python-list@python.org> 
	<90e5f42d-b0d0-4578-82ea-9d0e5770048b@k2g2000pro.googlegroups.com>
Message-ID: <e0a6a1a2-77b4-48ac-81aa-4f34b6130e06@u19g2000prh.googlegroups.com>

On Mar 8, 10:39?pm, casevh <cas... at gmail.com> wrote:
> [also replying to Geremy since the OP's message doesn't appear...]
>
> On Mar 8, 11:05?am, geremy condra <debat... at gmail.com> wrote:
>
>
>
>
>
> > On Mon, Mar 8, 2010 at 2:15 AM, Fahad Ahmad <miracles... at hotmail.com> wrote:
> > > Thanks Geremy,
>
> > > That has been an absolute bump........... GOD i cant sit on my chair, it has
> > > worked even on 512 bit number and with no time..........
> > > superb i would say.
>
> > > lastly, i am using the code below to calculate Largest Prime factor of a
> > > number:
>
> > > print
> > > ('''=======================================================================??========'''
> > > ?????? '''????????????? CALCULATE? HIGHEST PRIME
> > > FACTOR????????????????????????????????? '''
>
> > > '''========================================================================??=======''')
>
> > > #!/usr/bin/env python
> > > def highest_prime_factor(n):
> > > ?? if isprime(n):
> > > ????? return n
> > > ?? for x in xrange(2,n ** 0.5 + 1):
> > > ????? if not n % x:
> > > ???????? return highest_prime_factor(n/x)
> > > def isprime(n):
> > > ?? for x in xrange(2,n ** 0.5 + 1):
> > > ????? if not n % x:
> > > ???????? return False
> > > ?? return True
> > > if? __name__ == "__main__":
> > > ?? import time
> > > ?? start = time.time()
> > > ?? print highest_prime_factor(1238162376372637826)
> > > ?? print time.time() - start
>
> > > the code works with a bit of delay on the number : "1238162376372637826" but
> > > extending it to
> > > (10902610991329142436630551158108608965062811746392577675456004845499113044??30471090261099132914243663055115810860896506281174639257767545600484549911?3?0443047)
> > > ?makes python go crazy. Is there any way just like above, i can have it
> > > calculated it in no time.
>
> > > thanks for the support.
>
> > If you're just looking for the largest prime factor I would suggest using
> > a fermat factorization attack. In the example you gave, it returns
> > nearly immediately.
>
> > Geremy Condra- Hide quoted text -
>
> > - Show quoted text -
>
> For a Python-based solution, you might want to look at pyecm (http://
> sourceforge.net/projects/pyecm/)
>
> On a system with gmpy installed also, pyecm found the following
> factors:
>
> 101, 521, 3121, 9901, 36479, 300623, 53397071018461,
> 1900381976777332243781
>
> There still is a 98 digit unfactored composite:
>
> 602525071745682437589111511878284384468144476539868422797968232621651594065?00174226172705680274911
>
> Factoring this remaining composite using ECM may not be practical.
>
> casevh- Hide quoted text -
>
> - Show quoted text -

After a few hours, the remaining factors are

6060517860310398033985611921721

and

9941808367425935774306988776021629111399536914790551022447994642391

casevh


From mehgcap at gmail.com  Tue Mar  9 08:55:39 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Tue, 9 Mar 2010 08:55:39 -0500
Subject: odd error
Message-ID: <bc7f680c1003090555o4d09c7b1l40bb21967d767885@mail.gmail.com>

Hi all,
In the same program I wrote about yesterday, I have a dictionary of
keystrokes which are captured. I just tried adding a new one, bringing
the total to 11. Here are entries 10 and 11; 10 has been working fine
for months.

  10 : (57, win32con.MOD_CONTROL),
  11 : (99, win32con.MOD_CONTROL | win32con.MOD_SHIFT)

Now, though, when I press ctrl-shift-c (keystroke 11), nothing
happens. Pressing any other keystroke after that will crash the
program with some sort of Python internal com server exception that I
have never seen before. When set to a keystroke I already use, such as
#10, the function called by #11 works just fine. Does anyone see a
problem with the above syntax? The trouble almost definitely has to be
there; again, using an already-working keystroke instead of making a
new one works perfectly, it is just when I add this new one that
things break.

-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From simon at brunningonline.net  Tue Mar  9 09:00:42 2010
From: simon at brunningonline.net (Simon Brunning)
Date: Tue, 9 Mar 2010 14:00:42 +0000
Subject: a newbie's question
In-Reply-To: <ee9ad2071003090551v5def00c6jd04eef99f4545d20@mail.gmail.com>
References: <ee9ad2071003090551v5def00c6jd04eef99f4545d20@mail.gmail.com>
Message-ID: <8c7f10c61003090600u692bfd8sdc287a73425ed47e@mail.gmail.com>

On 9 March 2010 13:51, Lan Qing <efiish at gmail.com> wrote:
> Hi all,
> ?? ? ?I'm a newbie of python programming language.

Welcome!

> I have used c/c++ for 5
> years, and one year experience in Lua programming language. Can any one give
> me some advice on learning python. Think you for any help!!

You'll find some useful starting points here -
<http://wiki.python.org/moin/BeginnersGuide/Programmers>.

-- 
Cheers,
Simon B.


From ssteinerx at gmail.com  Tue Mar  9 09:04:53 2010
From: ssteinerx at gmail.com (ssteinerX@gmail.com)
Date: Tue, 9 Mar 2010 09:04:53 -0500
Subject: Opportunity to author Python books- Packt Publishing.
In-Reply-To: <B9C59EAAF7F14FF98A361596DD5525B4@sonyPC>
References: <B9C59EAAF7F14FF98A361596DD5525B4@sonyPC>
Message-ID: <8E3C96A7-D2AF-4E5F-89CB-74E2F92668D0@gmail.com>

On Mar 8, 2010, at 6:25 AM, Kshipra Singh wrote:

I would be delighted to write a cookbook on the stuff I use every day: python for administering cloud servers.  

Thanks,

S
aka/Steve Steiner
aka/ssteinerX


> Hi All,
>  
> I am writing to you for Packt Publishing, the publishers computer related books.
>  
> We are planning to extend our catalogue of cookbooks and are currently inviting "Python" fanatics interested in writing a cookbook. So, if you love "Python" and are interested in writing a cookbook, please contact us with your book ideas atauthor at packtpub.com. Even if you do not have a book idea and are simply interested in authoring a cookbook, we are keen to hear from you.
>  
> More details about the opportunity are available at: http://authors.packtpub.com/content/python-fanatics-invited-write-packt
>  
> Thanks
> Kshipra Singh
> Author Relationship Manager
> Packt Publishing
> www.PacktPub.com
>  
> Skype: kshiprasingh15
> Twitter: http://twitter.com/kshipras
>  
> Interested in becoming an author? Visit http://authors.packtpub.com for all the information you need about writing for Packt.
> -- 
> http://mail.python.org/mailman/listinfo/python-list

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From python at bdurham.com  Tue Mar  9 09:09:01 2010
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 09 Mar 2010 09:09:01 -0500
Subject: Choosing a collection of common modules/packages for a general purpose
	reusable PY2EXE runtime
Message-ID: <1268143741.31835.1363885481@webmail.messagingengine.com>

We've decided to build a re-usable *general purpose* PY2EXE
"runtime" that can be shared by a number of scripts vs.
distributing a monolithic EXE for each of our scripts.

A list of the Python 2.6.4 compatible modules/packages we decided
to include (and exclude) in our "runtime" follows my signature.

Any suggestions on additions or deletions appreciated.

Thanks,
Malcolm

3rd party modules/packages:
- jsonpickle
- win32api
- winshell

We've included all modules from the Python standard library
EXCEPT the following:
http://www.python.org/doc/2.6.4/modindex.html
- aifc
- audioop
- bsddb
- Carbon
- dbhash
- distutils
- dumbdbm
- netrc
- plistlib
- robotparser
- ScrolledText
- shelve
- sunau
- tabnanny
- Tix
- Tkinter
- turtle
- whichdb
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From jjposner at optimum.net  Tue Mar  9 09:18:42 2010
From: jjposner at optimum.net (John Posner)
Date: Tue, 09 Mar 2010 09:18:42 -0500
Subject: imported var not being updated
In-Reply-To: <mailman.478.1268110509.23598.python-list@python.org>
References: <bc7f680c1003082022k4b1dd708i1d6e17cdf05db563@mail.gmail.com>
	<mailman.478.1268110509.23598.python-list@python.org>
Message-ID: <4B9658C2.1040707@optimum.net>

On 3/8/2010 11:55 PM, Gary Herron wrote:
<snip>
>
> The form of import you are using
> from helpers import mostRecent
> makes a *new* binding to the value in the module that's doing the
> import.

<snip>

> What you can do, is not make a separate binding, but reach into the
> helpers module to get the value there. Like this:
>
> import helpers
> print helpers.mostRecent
>

Gary, are you asserting that in these separate situations:

one.py:

   from helpers import mostRecent
   x = mostRecent

two.py:

   import helpers
   x = helpers.mostRecent


... the name "x" will be bound to different objects?

Tx,
John


From xahlee at gmail.com  Tue Mar  9 09:24:42 2010
From: xahlee at gmail.com (Xah Lee)
Date: Tue, 9 Mar 2010 06:24:42 -0800 (PST)
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<4b90a1f8$0$1629$742ec2ed@news.sonic.net>
	<0d381135-730a-45e4-9225-9ba2a29b77fe@k2g2000pro.googlegroups.com>
	<Xns9D35C3BFCE829duncanbooth@127.0.0.1>
Message-ID: <13c167f4-5e37-48a0-a480-3494c212035c@k5g2000pra.googlegroups.com>

On Mar 8, 11:14?am, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> Xah Lee <xah... at gmail.com> wrote:
> > For example, consider, if you are within world's top 100th user of
> > database in terms of database size, such as Google, then it may be
> > that the off-the-shelf tools may be limiting. But how many users
> > really have such massive size of data?
>
> You've totally missed the point. It isn't the size of the data you have
> today that matters, it's the size of data you could have in several years'
> time.

so, you saying, in several years, we'd all become the world's top 100
database users in terms of size, like Google?

  Xah
? http://xahlee.org/

?


From benjamin.kaplan at case.edu  Tue Mar  9 09:25:38 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Tue, 9 Mar 2010 09:25:38 -0500
Subject: imported var not being updated
In-Reply-To: <4B9658C2.1040707@optimum.net>
References: <bc7f680c1003082022k4b1dd708i1d6e17cdf05db563@mail.gmail.com>
	<mailman.478.1268110509.23598.python-list@python.org>
	<4B9658C2.1040707@optimum.net>
Message-ID: <ec96e1391003090625o55527930u9e5afc69e5d882dc@mail.gmail.com>

On Tue, Mar 9, 2010 at 9:18 AM, John Posner <jjposner at optimum.net> wrote:

> On 3/8/2010 11:55 PM, Gary Herron wrote:
> <snip>
>
>
>> The form of import you are using
>> from helpers import mostRecent
>> makes a *new* binding to the value in the module that's doing the
>> import.
>>
>
> <snip>
>
>
>  What you can do, is not make a separate binding, but reach into the
>> helpers module to get the value there. Like this:
>>
>> import helpers
>> print helpers.mostRecent
>>
>>
> Gary, are you asserting that in these separate situations:
>
> one.py:
>
>  from helpers import mostRecent
>  x = mostRecent
>
> two.py:
>
>  import helpers
>  x = helpers.mostRecent
>
>
> ... the name "x" will be bound to different objects?
>
> Tx,
> John
>
>
No. the name x will be bound to the same object. It's the other way that
gives a problem

from helpers import mostRecent

works like

import helpers
mostRecent = helpers.mostRecent
del helpers

so when you do

mostRecent = x

it rebinds "mostRecent" in the current scope but doesn't affect
helpers.mostRecent, the name in the "helpers" module.


> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From python at bdurham.com  Tue Mar  9 09:27:49 2010
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 09 Mar 2010 09:27:49 -0500
Subject: (updated) Choosing a collection of common modules/packages for a
	general purpose    reusable PY2EXE runtime
In-Reply-To: <1268143741.31835.1363885481@webmail.messagingengine.com>
References: <1268143741.31835.1363885481@webmail.messagingengine.com>
Message-ID: <1268144869.2338.1363892987@webmail.messagingengine.com>

We've decided to build a re-usable *general purpose* PY2EXE
"runtime" that can be shared by a number of scripts vs.
distributing a monolithic EXE for each of our scripts.

A list of the Python 2.6.4 compatible modules/packages we decided
to include (and exclude) in our "runtime" follows my signature.

Any suggestions on additions or deletions appreciated.

Thanks,
Malcolm

3rd party modules/packages:
- jsonpickle
- wmi <--- forgot this one in my original post
- win32api
- winshell

We've included all modules from the Python standard library
EXCEPT the following:
http://www.python.org/doc/2.6.4/modindex.html
- aifc
- audioop
- bsddb
- Carbon
- dbhash
- distutils
- dumbdbm
- netrc
- plistlib
- robotparser
- ScrolledText
- shelve
- sunau
- tabnanny
- Tix
- Tkinter
- turtle
- whichdb


From bruno.42.desthuilliers at websiteburo.invalid  Tue Mar  9 09:48:59 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 09 Mar 2010 15:48:59 +0100
Subject: imported var not being updated
In-Reply-To: <4B9658C2.1040707@optimum.net>
References: <bc7f680c1003082022k4b1dd708i1d6e17cdf05db563@mail.gmail.com>
	<mailman.478.1268110509.23598.python-list@python.org>
	<4B9658C2.1040707@optimum.net>
Message-ID: <4b965fde$0$14410$426a74cc@news.free.fr>

John Posner a ?crit :
> On 3/8/2010 11:55 PM, Gary Herron wrote:
> <snip>
>>
>> The form of import you are using
>> from helpers import mostRecent
>> makes a *new* binding to the value in the module that's doing the
>> import.
> 
> <snip>
> 
>> What you can do, is not make a separate binding, but reach into the
>> helpers module to get the value there. Like this:
>>
>> import helpers
>> print helpers.mostRecent
>>
> 
> Gary, are you asserting that in these separate situations:
> 
> one.py:
> 
>   from helpers import mostRecent
>   x = mostRecent
> 
> two.py:
> 
>   import helpers
>   x = helpers.mostRecent
> 
> 
> ... the name "x" will be bound to different objects?

Nope. What he's saying is that one.x and two.x are two different names - 
each living in it's own namespace - that happen to be bound to the same 
object. Now rebiding one.x to a different object will _of course_ have 
no impact on the object two.x is bound to.

That's exactly the same as:

one = dict()
two = dict()

# one['x'] and two['x'] refer to the same object
one['x'] = two['x'] = ["foo", "bar"]
print one['x'], two['x'], one['x'] is two['x']

# mutating one['x'], visible in two['x']
# (of course since it's the same object)
one['x'].append("baaz")
print one['x'], two['x'], one['x'] is two['x']

# now rebind one['x']
one['x'] = 42

# obvious result: one['x'] and two['x'] now refer to 2 different objects
print one['x'], two['x'], one['x'] is two['x']


If in doubt about namespaces, think dicts. Namespaces are like dicts - 
and are often nothing else that a plain old dict FWIW.

HTH


From spamfresser at ch3ka.de  Tue Mar  9 10:00:00 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Tue, 09 Mar 2010 16:00:00 +0100
Subject: related lists mean value (golfed)
In-Reply-To: <hn5dbo$ih6$02$1@news.t-online.com>
References: <mailman.470.1268087649.23598.python-list@python.org>
	<hn5801$sps$1@news.urz.uni-heidelberg.de>
	<hn5ad7$t8a$1@news.urz.uni-heidelberg.de>
	<hn5dbo$ih6$02$1@news.t-online.com>
Message-ID: <hn5npf$2kg$1@news.urz.uni-heidelberg.de>

Am 09.03.2010 13:02, schrieb Peter Otten:
>>>> [sum(a for a,b in zip(x,y) if b==c)/y.count(c)for c in y]
> [1.5, 1.5, 8.0, 4.0, 4.0, 4.0]
> Peter

... pwned.
Should be the fastest and shortest way to do it.

I tried to do something like this, but my brain hurt while trying to 
visualize list comprehension evaluation orders ;)

Regards,
Michael


From kishoreinme at gmail.com  Tue Mar  9 10:01:22 2010
From: kishoreinme at gmail.com (kishore)
Date: Tue, 9 Mar 2010 07:01:22 -0800 (PST)
Subject: pyserial script doesnt execute properly
References: <c083a958-7320-4fd3-82ae-cf4da7808af6@u15g2000prd.googlegroups.com>
	<4b9612bc$0$6059$426a74cc@news.free.fr>
Message-ID: <bf3cbd2a-eb4c-455c-9b01-de44d6b35f60@v34g2000prm.googlegroups.com>

On Mar 9, 2:19?pm, News123 <news... at free.fr> wrote:
> Hi,
>
>
>
> kishore wrote:
> > hello there
>
> > Iam using python 2.5.4
> > pyserial ?2.4
> > pywin32-214
>
> > on windows 7
>
> > i hav a small test script written to query a serial device (arduino)
> > and get back reply appropriately
>
> > ////file: test.py
>
> > import serial
> > print 'hi'
> > ser=serial.Serial(port='\\.\COM2', baudrate=9600)
> > ser.close()
> > ser.open()
> > ser.write('1')
> > ser.readline()
> > ser.readline()
> > ser.close()
>
> > the device waits for '1' through its serial interface and print two
> > lines if it gets '1'
>
> > "Some Data found" and "Header received"
>
> > the script works on IDLE well when given one line at a time
>
> > but when given in command line as python test.py it prints hi and wait
> > forever
>
> Unfortunately I don't remember exacty, but try following:
>
> close IDLE and try then to start the script from the command line.
> I remember having had a problem with idle, that it did not always close
> the UART port
> (especially, when an error (e.g. syntax) occured before the close statement)
>
> bye
>
> N


Thanks for your response
i tried closing idle and the following code prints
port opened
Write failed

code:

import serial
import time
ser=serial.Serial(port='\\.\COM2', baudrate=9600)
if ser:
	print 'port opened'
ser.open()
if ser.write('1'):
	print 'Write success'
else:
	print 'write failed'

time.sleep(1)

a=ser.readline()
time.sleep(1)
b=ser.readline()
print b
ser.close()



I believe this might be a serial port access error.
how to solve this?
Any suggestions?


From bruno.42.desthuilliers at websiteburo.invalid  Tue Mar  9 10:02:04 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 09 Mar 2010 16:02:04 +0100
Subject: NoSQL Movement?
In-Reply-To: <mailman.341.1267790217.23598.python-list@python.org>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>	<mailman.256.1267655008.23598.python-list@python.org>	<BABjn.11012$pv.4575@news-server.bigpond.net.au>	<mailman.270.1267671204.23598.python-list@python.org>	<4b90e2d0$0$10096$426a34cc@news.free.fr>
	<mailman.341.1267790217.23598.python-list@python.org>
Message-ID: <4b9662ee$0$9131$426a74cc@news.free.fr>

mk a ?crit :
> Bruno Desthuilliers wrote:
>>> Well, Zope is backed by an object database rather than a relational one.
>>
>> And it ended up being a *major* PITA on all Zope projects I've worked 
>> on...
> 
> Care to write a few sentences on nature of problems with zodb? I was 
> flirting with the thought of using it on some project.

Would require more than a few sentences. But mostly, it's about the very 
nature of the Zodb : it's a giant graph of Python objects.

So :
1/ your "data" are _very_ tightly dependant on the language and 
applicative code
2/ you have to hand-write each and every graph traversal
3/ accessing a given object usually loads quite a few others in memory


I once thought the Zodb was cool.


From stefan_ml at behnel.de  Tue Mar  9 10:07:54 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 09 Mar 2010 16:07:54 +0100
Subject: remove element with ElementTree
In-Reply-To: <8ad6319f-97f1-46b7-b89e-d455bd89ad03@b9g2000pri.googlegroups.com>
References: <790217d6-e230-44e8-9aa1-4f8c7a66170c@g7g2000yqe.googlegroups.com>
	<8ad6319f-97f1-46b7-b89e-d455bd89ad03@b9g2000pri.googlegroups.com>
Message-ID: <hn5o8b$pud$1@dough.gmane.org>

Justin Ezequiel, 09.03.2010 10:34:
> On Mar 9, 11:35 am, tdan<df.tr... at gmail.com>  wrote:
>> I have been using ElementTree to write an app, and would like to
>> simply remove an element.
>> But in ElementTree, you must know both the parent and the child
>> element to do this.
>> There is no getparent() function, so I am stuck if I only have an
>> element.
>
> see http://effbot.org/zone/element.htm#accessing-parents

Also note that there is an independent ElementTree implementation called 
lxml.etree, which has parent pointers.

Stefan



From showell30 at yahoo.com  Tue Mar  9 10:21:15 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Tue, 9 Mar 2010 07:21:15 -0800 (PST)
Subject: related lists mean value
References: <mailman.470.1268087649.23598.python-list@python.org> 
	<4B95B4FF.1070407@optimum.net>
Message-ID: <5574554b-1d62-4faf-bb89-34cb431741cd@q2g2000pre.googlegroups.com>

On Mar 8, 6:39?pm, John Posner <jjpos... at optimum.net> wrote:
> On 3/8/2010 5:34 PM, dimitri pater - serpia wrote:
>
> > Hi,
>
> > I have two related lists:
> > x = [1 ,2, 8, 5, 0, 7]
> > y = ['a', 'a', 'b', 'c', 'c', 'c' ]
>
> > what I need is a list representing the mean value of 'a', 'b' and 'c'
> > while maintaining the number of items (len):
> > w = [1.5, 1.5, 8, 4, 4, 4]
>
> > I have looked at iter(tools) and next(), but that did not help me. I'm
> > a bit stuck here, so your help is appreciated!
>
> Nobody expects object-orientation (or the Spanish Inquisition):
>

Heh.  Yep, I avoided OO for this.  Seems like a functional problem.
My solution is functional on the outside, imperative on the inside.
You could add recursion here, but I don't think it would be as
straightforward.

def num_dups_at_head(lst):
    assert len(lst) > 0
    val = lst[0]
    i = 1
    while i < len(lst) and lst[i] == val:
        i += 1
    return i

def smooth(x, y):
    result = []
    while x:
        cnt = num_dups_at_head(y)
        avg = sum(x[:cnt]) * 1.0 / cnt
        result += [avg] * cnt
        x = x[cnt:]
        y = y[cnt:]
    return result


> #-------------------------
> from collections import defaultdict
>
> class Tally:
> ? ? ?def __init__(self, id=None):
> ? ? ? ? ?self.id = id
> ? ? ? ? ?self.total = 0
> ? ? ? ? ?self.count = 0
>
> x = [1 ,2, 8, 5, 0, 7]
> y = ['a', 'a', 'b', 'c', 'c', 'c']
>
> # gather data
> tally_dict = defaultdict(Tally)
> for i in range(len(x)):
> ? ? ?obj = tally_dict[y[i]]
> ? ? ?obj.id = y[i]
> ? ? ?obj.total += x[i]
> ? ? ?obj.count += 1
>
> # process data
> result_list = []
> for key in sorted(tally_dict):
> ? ? ?obj = tally_dict[key]
> ? ? ?mean = 1.0 * obj.total / obj.count
> ? ? ?result_list.extend([mean] * obj.count)
> print result_list
> #-------------------------


From kishoreinme at gmail.com  Tue Mar  9 10:30:32 2010
From: kishoreinme at gmail.com (kishore)
Date: Tue, 9 Mar 2010 07:30:32 -0800 (PST)
Subject: pyserial script doesnt execute properly
References: <c083a958-7320-4fd3-82ae-cf4da7808af6@u15g2000prd.googlegroups.com>
	<4b9612bc$0$6059$426a74cc@news.free.fr>
	<bf3cbd2a-eb4c-455c-9b01-de44d6b35f60@v34g2000prm.googlegroups.com>
Message-ID: <6596caf4-8d36-40b4-8e8d-a5ed2a18f245@z1g2000prc.googlegroups.com>

On Mar 9, 8:01?pm, kishore <kishorei... at gmail.com> wrote:
> On Mar 9, 2:19?pm, News123 <news... at free.fr> wrote:
>
>
>
> > Hi,
>
> > kishore wrote:
> > > hello there
>
> > > Iam using python 2.5.4
> > > pyserial ?2.4
> > > pywin32-214
>
> > > on windows 7
>
> > > i hav a small test script written to query a serial device (arduino)
> > > and get back reply appropriately
>
> > > ////file: test.py
>
> > > import serial
> > > print 'hi'
> > > ser=serial.Serial(port='\\.\COM2', baudrate=9600)
> > > ser.close()
> > > ser.open()
> > > ser.write('1')
> > > ser.readline()
> > > ser.readline()
> > > ser.close()
>
> > > the device waits for '1' through its serial interface and print two
> > > lines if it gets '1'
>
> > > "Some Data found" and "Header received"
>
> > > the script works on IDLE well when given one line at a time
>
> > > but when given in command line as python test.py it prints hi and wait
> > > forever
>
> > Unfortunately I don't remember exacty, but try following:
>
> > close IDLE and try then to start the script from the command line.
> > I remember having had a problem with idle, that it did not always close
> > the UART port
> > (especially, when an error (e.g. syntax) occured before the close statement)
>
> > bye
>
> > N
>
> Thanks for your response
> i tried closing idle and the following code prints
> port opened
> Write failed
>
> code:
>
> import serial
> import time
> ser=serial.Serial(port='\\.\COM2', baudrate=9600)
> if ser:
> ? ? ? ? print 'port opened'
> ser.open()
> if ser.write('1'):
> ? ? ? ? print 'Write success'
> else:
> ? ? ? ? print 'write failed'
>
> time.sleep(1)
>
> a=ser.readline()
> time.sleep(1)
> b=ser.readline()
> print b
> ser.close()
>
> I believe this might be a serial port access error.
> how to solve this?
> Any suggestions?

have found one more person with same problem but no solution

http://mail.python.org/pipermail/python-win32/2009-January/008613.html


From eckhardt at satorlaser.com  Tue Mar  9 10:40:59 2010
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Tue, 09 Mar 2010 16:40:59 +0100
Subject: odd error
References: <mailman.486.1268142942.23598.python-list@python.org>
Message-ID: <bp6i67-0ad.ln1@satorlaser.homedns.org>

Alex Hall wrote:
> Now, though, when I press ctrl-shift-c (keystroke 11), nothing
> happens.

Control-C sends a special signal to the console, like Control-Break.

> Pressing any other keystroke after that will crash the program
> with some sort of Python internal com server exception that I
> have never seen before.

Neither do I, in particular since you don't share that rare gem with us. ;)

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From kishoreinme at gmail.com  Tue Mar  9 10:42:21 2010
From: kishoreinme at gmail.com (kishore)
Date: Tue, 9 Mar 2010 07:42:21 -0800 (PST)
Subject: pyserial script doesnt execute properly
References: <c083a958-7320-4fd3-82ae-cf4da7808af6@u15g2000prd.googlegroups.com>
	<4b9612bc$0$6059$426a74cc@news.free.fr>
	<bf3cbd2a-eb4c-455c-9b01-de44d6b35f60@v34g2000prm.googlegroups.com>
Message-ID: <2c849953-6556-4f5b-b88c-1fae6e4f27ce@t20g2000yqe.googlegroups.com>

On Mar 9, 8:01?pm, kishore <kishorei... at gmail.com> wrote:
> On Mar 9, 2:19?pm, News123 <news... at free.fr> wrote:
>
>
>
> > Hi,
>
> > kishore wrote:
> > > hello there
>
> > > Iam using python 2.5.4
> > > pyserial ?2.4
> > > pywin32-214
>
> > > on windows 7
>
> > > i hav a small test script written to query a serial device (arduino)
> > > and get back reply appropriately
>
> > > ////file: test.py
>
> > > import serial
> > > print 'hi'
> > > ser=serial.Serial(port='\\.\COM2', baudrate=9600)
> > > ser.close()
> > > ser.open()
> > > ser.write('1')
> > > ser.readline()
> > > ser.readline()
> > > ser.close()
>
> > > the device waits for '1' through its serial interface and print two
> > > lines if it gets '1'
>
> > > "Some Data found" and "Header received"
>
> > > the script works on IDLE well when given one line at a time
>
> > > but when given in command line as python test.py it prints hi and wait
> > > forever
>
> > Unfortunately I don't remember exacty, but try following:
>
> > close IDLE and try then to start the script from the command line.
> > I remember having had a problem with idle, that it did not always close
> > the UART port
> > (especially, when an error (e.g. syntax) occured before the close statement)
>
> > bye
>
> > N
>
> Thanks for your response
> i tried closing idle and the following code prints
> port opened
> Write failed
>
> code:
>
> import serial
> import time
> ser=serial.Serial(port='\\.\COM2', baudrate=9600)
> if ser:
> ? ? ? ? print 'port opened'
> ser.open()
> if ser.write('1'):
> ? ? ? ? print 'Write success'
> else:
> ? ? ? ? print 'write failed'
>
> time.sleep(1)
>
> a=ser.readline()
> time.sleep(1)
> b=ser.readline()
> print b
> ser.close()
>
> I believe this might be a serial port access error.
> how to solve this?
> Any suggestions?

have found one more person with same problem but no solution

http://mail.python.org/pipermail/python-win32/2009-January/008613.html


From stefan_ml at behnel.de  Tue Mar  9 10:45:48 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 09 Mar 2010 16:45:48 +0100
Subject: remove element with ElementTree
In-Reply-To: <790217d6-e230-44e8-9aa1-4f8c7a66170c@g7g2000yqe.googlegroups.com>
References: <790217d6-e230-44e8-9aa1-4f8c7a66170c@g7g2000yqe.googlegroups.com>
Message-ID: <hn5qfd$674$1@dough.gmane.org>

tdan, 09.03.2010 04:35:
> I have been using ElementTree to write an app, and would like to
> simply remove an element.
> But in ElementTree, you must know both the parent and the child
> element to do this.
> There is no getparent() function, so I am stuck if I only have an
> element.
>
> I am iterating over a table and getting all<td>  tags, checking their
> text, and conditionally deleting them:
>
> def RemoveElementWithText( topEl, subEl, text ):

Note that all-camel-case names are rather unusual for function names and 
rather used for class names. See PEP 8 for a style guide.


> 	for el in topEl.getiterator( subEl ):
> 		if el.text = text:
> 			break
> 	else:
> 		el = None
> 	return el
>
> RemoveElementWithText( table, 'td', 'sometext' )
>
> My table is like so:
>
> <table>
>   <thead>...
>   <tbody><tr><td>...
>
> Is there any way to do this in ElementTree?

I think the easiest is to iterate not over the elements themselves, but 
over their parents, and then to remove all children of the specified tag in 
each step.

Stefan



From robert.kern at gmail.com  Tue Mar  9 11:01:07 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 09 Mar 2010 10:01:07 -0600
Subject: scipy sparse matrix question
In-Reply-To: <1jf28jr.7abra61nwu04pN%see@sig.for.address>
References: <1jf28jr.7abra61nwu04pN%see@sig.for.address>
Message-ID: <hn5rc3$a2r$1@dough.gmane.org>

On 2010-03-09 00:14 AM, Victor Eijkhout wrote:
> I can't find any detailed information about scipy.sparse.

The place to ask would be on scipy-user:

   http://www.scipy.org/Mailing_Lists

> My specific question: what does "for x in A" give me when A is a sparse
> matrix? It seems to yield all nonzero locations,

No, it gives you rows, just like a dense 2D array.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From __peter__ at web.de  Tue Mar  9 11:10:26 2010
From: __peter__ at web.de (Peter Otten)
Date: Tue, 09 Mar 2010 17:10:26 +0100
Subject: related lists mean value (golfed)
References: <mailman.470.1268087649.23598.python-list@python.org>
	<hn5801$sps$1@news.urz.uni-heidelberg.de>
	<hn5ad7$t8a$1@news.urz.uni-heidelberg.de>
	<hn5dbo$ih6$02$1@news.t-online.com>
	<hn5npf$2kg$1@news.urz.uni-heidelberg.de>
Message-ID: <hn5rt6$6m1$03$1@news.t-online.com>

Michael Rudolf wrote:

> Am 09.03.2010 13:02, schrieb Peter Otten:
>>>>> [sum(a for a,b in zip(x,y) if b==c)/y.count(c)for c in y]
>> [1.5, 1.5, 8.0, 4.0, 4.0, 4.0]
>> Peter
> 
> ... pwned.
> Should be the fastest and shortest way to do it.

It may be short, but it is not particularly efficient. A dict-based approach 
is probably the fastest. If y is guaranteed to be sorted itertools.groupby() 
may also be worth a try.

$ cat tmp_average_compare.py
from __future__ import division
from collections import defaultdict
try:
    from itertools import izip as zip
except ImportError:
    pass

x = [1 ,2, 8, 5, 0, 7]
y = ['a', 'a', 'b', 'c', 'c', 'c' ]

def f(x=x, y=y):
    p = defaultdict(int)
    q = defaultdict(int)
    for a, b in zip(x, y):
        p[b] += a
        q[b] += 1
    return [p[b]/q[b] for b in y]

def g(x=x, y=y):
    return [sum(a for a,b in zip(x,y)if b==c)/y.count(c)for c in y]

if __name__ == "__main__":
    print(f())
    print(g())
    assert f() == g()
$ python3 -m timeit -s 'from tmp_average_compare import f, g' 'f()'
100000 loops, best of 3: 11.4 usec per loop
$ python3 -m timeit -s 'from tmp_average_compare import f, g' 'g()'
10000 loops, best of 3: 22.8 usec per loop

Peter


From mehgcap at gmail.com  Tue Mar  9 11:18:05 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Tue, 9 Mar 2010 11:18:05 -0500
Subject: odd error
In-Reply-To: <bp6i67-0ad.ln1@satorlaser.homedns.org>
References: <mailman.486.1268142942.23598.python-list@python.org>
	<bp6i67-0ad.ln1@satorlaser.homedns.org>
Message-ID: <bc7f680c1003090818t537c40a9ue0a19a5bc7ba0083@mail.gmail.com>

I know ctrl-c kills a process in the shell, but these are global
hotkeys and all others work fine. You made me discover something,
though: the error only happens if ctrl-shift-c is pressed when in the
shell from where the program was run; when pressed anywhere else, the
keystroke does nothing at all. Is there something I am missing about
these keystroke dictionaries? It seems like they do not work unless
the keycodes are in numerical order and are not separated by more than
one number. Currently, my dictionary consists of the numbers 1-0 on
the top of the keyboard, but adding any other keycode, like the 99 in
my original message, will cause that keystroke to do absolutely
nothing. Thanks to your response, I suspect the problem is something
to do with the keypress being captured by the shell. Still, not being
able to use anything except numbers is very annoying!! Why would this
be happening?


On 3/9/10, Ulrich Eckhardt <eckhardt at satorlaser.com> wrote:
> Alex Hall wrote:
>> Now, though, when I press ctrl-shift-c (keystroke 11), nothing
>> happens.
>
> Control-C sends a special signal to the console, like Control-Break.
>
>> Pressing any other keystroke after that will crash the program
>> with some sort of Python internal com server exception that I
>> have never seen before.
>
> Neither do I, in particular since you don't share that rare gem with us. ;)
>
> Uli
>
> --
> Sator Laser GmbH
> Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From showell30 at yahoo.com  Tue Mar  9 11:29:44 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Tue, 9 Mar 2010 08:29:44 -0800 (PST)
Subject: related lists mean value
References: <mailman.470.1268087649.23598.python-list@python.org>
Message-ID: <253e4e31-21f7-42cc-8276-72afe8702946@q2g2000pre.googlegroups.com>

On Mar 8, 2:34?pm, dimitri pater - serpia <dimitri.pa... at gmail.com>
wrote:
> Hi,
>
> I have two related lists:
> x = [1 ,2, 8, 5, 0, 7]
> y = ['a', 'a', 'b', 'c', 'c', 'c' ]
>
> what I need is a list representing the mean value of 'a', 'b' and 'c'
> while maintaining the number of items (len):
> w = [1.5, 1.5, 8, 4, 4, 4]
>

What results are you expecting if you have multiple runs of 'a' in a
longer list?


From rrpsteps at gmail.com  Tue Mar  9 11:33:40 2010
From: rrpsteps at gmail.com (Rikal)
Date: Tue, 9 Mar 2010 08:33:40 -0800 (PST)
Subject: 1794 - Best, Cheapest Web-Hosting, Domain at $1.99!
Message-ID: <6cb49bce-7913-4e60-a458-5650f95ddc03@15g2000yqi.googlegroups.com>

World's Cheapest Rate Hosting, 99.9% Uptime
US Based Dedicated Server, Fast Customer Service
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From mail at timgolden.me.uk  Tue Mar  9 11:34:03 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 09 Mar 2010 16:34:03 +0000
Subject: odd error
In-Reply-To: <bc7f680c1003090555o4d09c7b1l40bb21967d767885@mail.gmail.com>
References: <bc7f680c1003090555o4d09c7b1l40bb21967d767885@mail.gmail.com>
Message-ID: <4B96787B.3030907@timgolden.me.uk>

On 09/03/2010 13:55, Alex Hall wrote:
> Hi all,
> In the same program I wrote about yesterday, I have a dictionary of
> keystrokes which are captured. I just tried adding a new one, bringing
> the total to 11. Here are entries 10 and 11; 10 has been working fine
> for months.
>
>    10 : (57, win32con.MOD_CONTROL),
>    11 : (99, win32con.MOD_CONTROL | win32con.MOD_SHIFT)
>
> Now, though, when I press ctrl-shift-c (keystroke 11)

Ctrl-C (with or without any other modifier) has a special meaning
which overrides any hotkeys. You may be able to do something by
adding a break handler through SetConsoleCtrlHandler (exposed in
win32api). But it would obviously be a special case outside your
normal control flow.

TJG


From gherron at islandtraining.com  Tue Mar  9 11:34:38 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Tue, 09 Mar 2010 08:34:38 -0800
Subject: imported var not being updated
In-Reply-To: <4B9658C2.1040707@optimum.net>
References: <bc7f680c1003082022k4b1dd708i1d6e17cdf05db563@mail.gmail.com>
	<mailman.478.1268110509.23598.python-list@python.org>
	<4B9658C2.1040707@optimum.net>
Message-ID: <4B96789E.8040402@islandtraining.com>

John Posner wrote:
> On 3/8/2010 11:55 PM, Gary Herron wrote:
> <snip>
>>
>> The form of import you are using
>> from helpers import mostRecent
>> makes a *new* binding to the value in the module that's doing the
>> import.
>
> <snip>
>
>> What you can do, is not make a separate binding, but reach into the
>> helpers module to get the value there. Like this:
>>
>> import helpers
>> print helpers.mostRecent
>>
>
> Gary, are you asserting that in these separate situations:
>
> one.py:
>
>   from helpers import mostRecent
>   x = mostRecent
>
> two.py:
>
>   import helpers
>   x = helpers.mostRecent
>
>
> ... the name "x" will be bound to different objects?
>
> Tx,
> John

Hi John,


No they are bound to the same object ... to start with.  But if, as the 
OP indicated, something in the helpers module changes that module's 
binding of 'mostRecent', then the only helpers.mostRecent in your two.py 
will notice that change.  The variable 'x' in both samples and the 
'mostRecent' value in one.py will remain unchanged.

That's true for mutable *and* immutable values -- however, mutable 
values admit a further consideration:  Since all 'x's and 'mostRecent's 
refer to the same value, any mutation is noticed in all cases.   But, 
*any* assignment ( with = or of the form *from helpers import 
mostRecent* ) breaks the reference to the shared value.

Gary Herron


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From mail at timgolden.me.uk  Tue Mar  9 11:36:32 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 09 Mar 2010 16:36:32 +0000
Subject: odd error
In-Reply-To: <4B96787B.3030907@timgolden.me.uk>
References: <bc7f680c1003090555o4d09c7b1l40bb21967d767885@mail.gmail.com>
	<4B96787B.3030907@timgolden.me.uk>
Message-ID: <4B967910.1090108@timgolden.me.uk>

On 09/03/2010 16:34, Tim Golden wrote:
> On 09/03/2010 13:55, Alex Hall wrote:
>> Hi all,
>> In the same program I wrote about yesterday, I have a dictionary of
>> keystrokes which are captured. I just tried adding a new one, bringing
>> the total to 11. Here are entries 10 and 11; 10 has been working fine
>> for months.
>>
>>     10 : (57, win32con.MOD_CONTROL),
>>     11 : (99, win32con.MOD_CONTROL | win32con.MOD_SHIFT)
>>
>> Now, though, when I press ctrl-shift-c (keystroke 11)
>
> Ctrl-C (with or without any other modifier) has a special meaning
> which overrides any hotkeys. You may be able to do something by
> adding a break handler through SetConsoleCtrlHandler (exposed in
> win32api). But it would obviously be a special case outside your
> normal control flow.

... or you could use SetConsoleMode to disable input processing. But
that would only work (I think) in one console, not at a global level.

TJG


From showell30 at yahoo.com  Tue Mar  9 11:38:35 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Tue, 9 Mar 2010 08:38:35 -0800 (PST)
Subject: related lists mean value
References: <mailman.470.1268087649.23598.python-list@python.org> 
	<4B95B4FF.1070407@optimum.net>
	<5574554b-1d62-4faf-bb89-34cb431741cd@q2g2000pre.googlegroups.com>
Message-ID: <08f0cc42-1d5b-4e45-be51-b68c617bd554@m27g2000prl.googlegroups.com>

On Mar 9, 7:21?am, Steve Howell <showel... at yahoo.com> wrote:
>
> def num_dups_at_head(lst):
> ? ? assert len(lst) > 0
> ? ? val = lst[0]
> ? ? i = 1
> ? ? while i < len(lst) and lst[i] == val:
> ? ? ? ? i += 1
> ? ? return i
>
> def smooth(x, y):
> ? ? result = []
> ? ? while x:
> ? ? ? ? cnt = num_dups_at_head(y)
> ? ? ? ? avg = sum(x[:cnt]) * 1.0 / cnt
> ? ? ? ? result += [avg] * cnt
> ? ? ? ? x = x[cnt:] # expensive?
> ? ? ? ? y = y[cnt:] # expensive?
> ? ? return result
>

BTW I recognize that my solution would be inefficient for long lists,
unless the underlying list implementation had copy-on-write.  I'm
wondering what the easiest fix would be.  I tried a quick shot at
islice(), but the lack of len() thwarted me.





From theller at ctypes.org  Tue Mar  9 11:43:23 2010
From: theller at ctypes.org (Thomas Heller)
Date: Tue, 09 Mar 2010 17:43:23 +0100
Subject: libc Sleep api performs a busy waiting
In-Reply-To: <27e52ad11003082013h658cf7deu761e7d14198af9f1@mail.gmail.com>
References: <a52b97c0-7266-4bc6-9ab4-3a8688120a6c@u19g2000prh.googlegroups.com>	<hn2qta$886$2@dough.gmane.org>
	<27e52ad11003082013h658cf7deu761e7d14198af9f1@mail.gmail.com>
Message-ID: <hn5trb$k6o$1@dough.gmane.org>

Joe Fox schrieb:
> Hi,
> 
>  actually i have simplified my scenario a lot here ,
> 
> In my actual case , i have to call a C-api which blocks on  c select , in a
> separate thread.
> 
> my thread is getting struck in that api , and thus blocking all the other
> threads.
> Can you point to something which will help me call this blocking C-api call
> without my thread getting struck.
> 
ctypes.  Releases the GIL before calling C api functions.



From mehgcap at gmail.com  Tue Mar  9 11:48:10 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Tue, 9 Mar 2010 11:48:10 -0500
Subject: odd error
In-Reply-To: <4B96787B.3030907@timgolden.me.uk>
References: <bc7f680c1003090555o4d09c7b1l40bb21967d767885@mail.gmail.com>
	<4B96787B.3030907@timgolden.me.uk>
Message-ID: <bc7f680c1003090848v3f4bbf28w9df15cd67f15c3e0@mail.gmail.com>

Okay, I changed the keycode from 99 (c) to 107 (k), and the errors
have disappeared. However, now the function that should be called is
not. As I said in a previous message, I have always had trouble with
this sort of keystroke dictionary. It seems like, if a keycode is out
of order or not one more than the number before it, the function to
which it is tied will not get called. I am using the message looping
mode from Tim Golden's website, and it works beautifully until I try
to put an out-of-sequence keycode into the keystrokes dictionary. The
dictionary contains numbers 0-9 (48-57) and all is well, but when I
put in this 107 code then the function tied to 107 is not called, yet
the ones tied to 48-57 still work normally. Why would the sequence
matter, or does it not and I am doing something else wrong? Here is a
sample of my dictionary:

keys.append({
  1 : (48, win32con.MOD_CONTROL),
  2 : (49, win32con.MOD_CONTROL),
  3 : (50, win32con.MOD_CONTROL),
  4 : (51, win32con.MOD_CONTROL),
  5 : (52, win32con.MOD_CONTROL),
  6 : (53, win32con.MOD_CONTROL),
  7 : (54, win32con.MOD_CONTROL),
  8 : (55, win32con.MOD_CONTROL),
  9 : (56, win32con.MOD_CONTROL),
  10 : (57, win32con.MOD_CONTROL),
  11 : (107, win32con.MOD_CONTROL | win32con.MOD_SHIFT) #never calls
its #function, and note that it is not in the sequence of the other
ten
})

and here is a list of functions tied to it:

funcs.append({
  1 : exitProgram,
  2 : arm.sayLoad1,
  3 : arm.sayLoad2,
  4 : arm.sayLoad3,
  5 : arm.sayLoad4,
  6 : arm.sayProcAvg,
  7 : arm.sayUsedRam,
  8 : arm.sayDisk1Info,
  9 : arm.sayDisk2Info,
  10 : nextMode,
  11: clipboard.toClipboard
})

If I were to tie clipboard.toClipboard to any of keys 1-10 (0-9, or
48-57) then it would work fine; it is when the 107 shows up that the
function is not called, and this is a huge limitation for the rest of
the program since I am stuck with just the ten numbers available on
the keyboard. Any suggestions would be great!


On 3/9/10, Tim Golden <mail at timgolden.me.uk> wrote:
> On 09/03/2010 13:55, Alex Hall wrote:
>> Hi all,
>> In the same program I wrote about yesterday, I have a dictionary of
>> keystrokes which are captured. I just tried adding a new one, bringing
>> the total to 11. Here are entries 10 and 11; 10 has been working fine
>> for months.
>>
>>    10 : (57, win32con.MOD_CONTROL),
>>    11 : (99, win32con.MOD_CONTROL | win32con.MOD_SHIFT)
>>
>> Now, though, when I press ctrl-shift-c (keystroke 11)
>
> Ctrl-C (with or without any other modifier) has a special meaning
> which overrides any hotkeys. You may be able to do something by
> adding a break handler through SetConsoleCtrlHandler (exposed in
> win32api). But it would obviously be a special case outside your
> normal control flow.
>
> TJG
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From jjposner at optimum.net  Tue Mar  9 11:49:37 2010
From: jjposner at optimum.net (John Posner)
Date: Tue, 09 Mar 2010 11:49:37 -0500
Subject: imported var not being updated
In-Reply-To: <4b965fde$0$14410$426a74cc@news.free.fr>
References: <bc7f680c1003082022k4b1dd708i1d6e17cdf05db563@mail.gmail.com>
	<mailman.478.1268110509.23598.python-list@python.org>
	<4B9658C2.1040707@optimum.net>
	<4b965fde$0$14410$426a74cc@news.free.fr>
Message-ID: <4b967bfa$0$31260$607ed4bc@cv.net>

On 3/9/2010 9:48 AM, Bruno Desthuilliers wrote:
> John Posner a ?crit :
>> On 3/8/2010 11:55 PM, Gary Herron wrote:
>> <snip>
>>>
>>> The form of import you are using
>>> from helpers import mostRecent
>>> makes a *new* binding to the value in the module that's doing the
>>> import.
>>
>> <snip>
>>
>>> What you can do, is not make a separate binding, but reach into the
>>> helpers module to get the value there. Like this:
>>>
>>> import helpers
>>> print helpers.mostRecent
>>>
>>
>> Gary, are you asserting that in these separate situations:
>>
>> one.py:
>>
>> from helpers import mostRecent
>> x = mostRecent
>>
>> two.py:
>>
>> import helpers
>> x = helpers.mostRecent
>>
>>
>> ... the name "x" will be bound to different objects?
>
> Nope. What he's saying is that one.x and two.x are two different names -
> each living in it's own namespace - that happen to be bound to the same
> object. Now rebiding one.x to a different object will _of course_ have
> no impact on the object two.x is bound to.

Sure -- my bad, Python 101. In this case, the module *helpers* is the 
equivalent of a container object, one of whose attributes *mostRecent* 
gets bound to a series of immutable string objects.

>
> That's exactly the same as:
>
> one = dict()
> two = dict()
>
> # one['x'] and two['x'] refer to the same object
> one['x'] = two['x'] = ["foo", "bar"]
> print one['x'], two['x'], one['x'] is two['x']
>
> # mutating one['x'], visible in two['x']
> # (of course since it's the same object)
> one['x'].append("baaz")
> print one['x'], two['x'], one['x'] is two['x']
>
> # now rebind one['x']
> one['x'] = 42
>
> # obvious result: one['x'] and two['x'] now refer to 2 different objects
> print one['x'], two['x'], one['x'] is two['x']
>
>
> If in doubt about namespaces, think dicts. Namespaces are like dicts -
> and are often nothing else that a plain old dict FWIW.

No doubts here, I hope. I even tend to see namespaces where, strictly 
speaking, they don't exist. As I said at the end of a recent (and 
flame-ridden) thread [1]:

   -----------
   * A dict is a collection of user-devised names, each of which
     is assigned to an object.
   * A list/tuple is an interpreter-maintained collection of integer
     names (0, 1, 2, ...), each of which is assigned to an object.
   -----------

So in my world, in mylist[cnt+1], the expression *cnt+1* is equivalent 
to the integer "name" 4 (if cnt==3, that is), so that

    mylist[cnt+1] = obj.subobj.attr

... is just a NAME2 = NAME1 kind of assignment statement, binding an 
additional name to an object that already has a name.

Tx,
John

[1] http://mail.python.org/pipermail/python-list/2010-February/1236318.html







From cbmanica at gmail.com  Tue Mar  9 11:54:55 2010
From: cbmanica at gmail.com (C. Benson Manica)
Date: Tue, 9 Mar 2010 08:54:55 -0800 (PST)
Subject: String is ASCII or UTF-8?
Message-ID: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>

Hours of Googling has not helped me resolve a seemingly simple
question - Given a string s, how can I tell whether it's ascii (and
thus 1 byte per character) or UTF-8 (and two bytes per character)?
This is python 2.4.3, so I don't have getsizeof available to me.


From alfps at start.no  Tue Mar  9 12:02:29 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Tue, 09 Mar 2010 18:02:29 +0100
Subject: String is ASCII or UTF-8?
In-Reply-To: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>
Message-ID: <hn5uvd$4i7$1@news.eternal-september.org>

* C. Benson Manica:
> Hours of Googling has not helped me resolve a seemingly simple
> question - Given a string s, how can I tell whether it's ascii (and
> thus 1 byte per character) or UTF-8 (and two bytes per character)?
> This is python 2.4.3, so I don't have getsizeof available to me.

Generally, if you need 100% certainty then you can't tell the encoding from a 
sequence of byte values.

However, if you know that it's EITHER ascii or utf-8 then the presence of any 
value above 127 (or, for signed byte values, any negative values), tells you 
that it can't be ascii, hence, must be utf-8. And since utf-8 is an extension of 
ascii nothing is lost by assuming ascii in the other case. So, problem solved.

If the string represents the contents of a file then you may also look for an 
UTF-8 represention of the Unicode BOM (Byte Order Mark) at the beginning. If 
found then it indicates utf-8 for almost-sure and more expensive searching can 
be avoided. It's just three bytes to check.


Cheers & hth.,

- Alf


From mail at timgolden.me.uk  Tue Mar  9 12:07:44 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 09 Mar 2010 17:07:44 +0000
Subject: String is ASCII or UTF-8?
In-Reply-To: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>
Message-ID: <4B968060.7080606@timgolden.me.uk>

On 09/03/2010 16:54, C. Benson Manica wrote:
> Hours of Googling has not helped me resolve a seemingly simple
> question - Given a string s, how can I tell whether it's ascii (and
> thus 1 byte per character) or UTF-8 (and two bytes per character)?
> This is python 2.4.3, so I don't have getsizeof available to me.

You can't. You can apply one or more heuristics, depending on exactly
what your requirement is. But any valid ASCII text is also valid
UTF8-encoded text since UTF-8 isn't "two bytes per char" but a variable
number of bytes per char.

Obviously, you can test whether all the bytes are less than 128 which
suggests that the text is legal ASCII. But then it's also legal UTF8.
Or you can just attempt to decode and catch the exception:

try:
   unicode (text, "ascii")
except UnicodeDecodeError:
   print "Not ASCII"


TJG


From stef.mientki at gmail.com  Tue Mar  9 12:12:48 2010
From: stef.mientki at gmail.com (Stef Mientki)
Date: Tue, 09 Mar 2010 18:12:48 +0100
Subject: String is ASCII or UTF-8?
In-Reply-To: <hn5uvd$4i7$1@news.eternal-september.org>
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>
	<hn5uvd$4i7$1@news.eternal-september.org>
Message-ID: <4B968190.6010208@gmail.com>

On 09-03-2010 18:02, Alf P. Steinbach wrote:
> * C. Benson Manica:
>> Hours of Googling has not helped me resolve a seemingly simple
>> question - Given a string s, how can I tell whether it's ascii (and
>> thus 1 byte per character) or UTF-8 (and two bytes per character)?
>> This is python 2.4.3, so I don't have getsizeof available to me.
>
> Generally, if you need 100% certainty then you can't tell the encoding 
> from a sequence of byte values.
>
> However, if you know that it's EITHER ascii or utf-8 then the presence 
> of any value above 127 (or, for signed byte values, any negative 
> values), tells you that it can't be ascii, 
AFAIK it's completely impossible.
UTF-8 characters have 1 to 4 bytes / byte.
I can create ASCII strings containing byte values between 127 and 255.

cheers,
Stef

> hence, must be utf-8. And since utf-8 is an extension of ascii nothing 
> is lost by assuming ascii in the other case. So, problem solved.
>
> If the string represents the contents of a file then you may also look 
> for an UTF-8 represention of the Unicode BOM (Byte Order Mark) at the 
> beginning. If found then it indicates utf-8 for almost-sure and more 
> expensive searching can be avoided. It's just three bytes to check.
>
>
> Cheers & hth.,
>
> - Alf



From tjreedy at udel.edu  Tue Mar  9 12:13:33 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 09 Mar 2010 12:13:33 -0500
Subject: scipy sparse matrix question
In-Reply-To: <1jf28jr.7abra61nwu04pN%see@sig.for.address>
References: <1jf28jr.7abra61nwu04pN%see@sig.for.address>
Message-ID: <hn5vjo$s4r$1@dough.gmane.org>

On 3/9/2010 1:14 AM, Victor Eijkhout wrote:
> I can't find any detailed information about scipy.sparse.

Scipy questions are best asked on the scipy list, which I suspect you 
can also access via news.gmane.org.

>
> My specific question: what does "for x in A" give me when A is a sparse
> matrix?

Try it and see what you get.



From MLMDev at Comcast.net  Tue Mar  9 12:15:59 2010
From: MLMDev at Comcast.net (Mitchell L Model)
Date: Tue, 9 Mar 2010 12:15:59 -0500
Subject: sys.stdout vs. sys.stderr
In-Reply-To: <mailman.3358.1263237302.28904.python-list@python.org>
References: <mailman.3358.1263237302.28904.python-list@python.org>
Message-ID: <CFCDBB14-0DD0-478E-8F45-9B974597F88C@Comcast.net>


On Jan 11, 2010, at 1:47 PM Nobody <nobody at nowhere.com> wrote:

>
>> On Mon, 11 Jan 2010 10:09:36 +0100, Martin v. Loewis wrote:
>>
>>> In Python 3.1 is there any difference in the buffering behavior of  
>>> the
>>> initial sys.stdout and sys.stderr streams?
>>
>> No.
>>
>>> Were they different at some earlier point in Python's evolution?
>>
>> That depends on the operating system. These used to be whatever the
>> C library set up as stdout and stderr. Typically, they were buffered
>> in the same way.
>
> On Unix, stdout will be line buffered if it is associated with a tty
> and fully buffered otherwise, while stderr is always unbuffered.
>
> On Windows, stdout and stderr are unbuffered if they refer to a  
> character
> device, fully buffered otherwise (Windows doesn't have line buffering;
> setvbuf(_IOLBF) is equivalent to setvbuf(_IOFBF)).
>
> ANSI C says:
>
> As initially opened, the standard error stream is not fully  
> buffered; the
> standard input and standard output streams are fully buffered if and  
> only
> if the  stream can be determined not to refer to an interactive  
> device.
>

I don't want to get into a quibble fight here, but I need to reraise  
this issue.
[I teach and write and want to make sure I get this right. I already  
have an
incorrect paragraph about this in my Bioinformatics Programming Using  
Python
book.] The key question here is line buffering vs full buffering. In  
Unix (at least
in an OS X Terminal), the following code prints a number every two  
seconds
in Python 2:

	>>> for n in range(5):
	. . .  		print >> sys.stderr, n,     # final , to not send newline
	. . .		time.sleep(2)

However, in Python 3, similar code does not print the numbers until  
the whole
thing finishes (again, running from the terminal).

	>>> for n in range(5):
	. . .  		print(n, file=sys.stderr, end='')
	. . .		time.sleep(2)

So it appears that in a Unix terminal window, Python 2 does not line- 
buffer stderr
whereas Python 3 does. That's what tripped me up. While developing and  
debugging
code, I often print periods on a line as some loop progresses  
(sometimes every Nth
time around, for some reasonable N) just to know the pace of execution  
and that
the program is still doing something. In doing that recently in Python  
3 I discovered that
I either had to leave out the end='' or do sys.stderr.flush() after  
every print, which
amounts to the same thing.

This was a big surprise, after many, many years of C, C++,
Java, and Python programming -- I have always thought of stderr as  
completely
unbuffered in languages that have it. Doesn't mean some languages line- 
buffer
stderr on some platforms, just pointing out an assumption I've lived  
with for a very
long time that tripped me up writing a note about using stderr in  
Python 3 without
actually demonstrating the code and therefore not catching my error.
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From cbmanica at gmail.com  Tue Mar  9 12:17:58 2010
From: cbmanica at gmail.com (C. Benson Manica)
Date: Tue, 9 Mar 2010 09:17:58 -0800 (PST)
Subject: String is ASCII or UTF-8?
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>
	<mailman.500.1268154470.23598.python-list@python.org>
Message-ID: <98375575-1071-46af-8ebc-f3c817b47e1d@q23g2000yqd.googlegroups.com>

On Mar 9, 12:07?pm, Tim Golden <m... at timgolden.me.uk> wrote:

> You can't. You can apply one or more heuristics, depending on exactly
> what your requirement is. But any valid ASCII text is also valid
> UTF8-encoded text since UTF-8 isn't "two bytes per char" but a variable
> number of bytes per char.

Hm, well that's very unfortunate.  I'm using a database library which
seems to assume that all strings passed to it are ASCII, and I'm
attempting to use it on two different systems - one where all strings
are ASCII, and one where they seem to be UTF-8.  The strings come from
the same place, i.e. they're exclusively normal ASCII characters.
What I would want is to check once for whether the strings passed to
function foo() are ASCII or UTF-8, and if they are to assume that all
strings need to be decoded.  So that's not possible?


From R.Brodie at rl.ac.uk  Tue Mar  9 12:24:49 2010
From: R.Brodie at rl.ac.uk (Richard Brodie)
Date: Tue, 9 Mar 2010 17:24:49 -0000
Subject: String is ASCII or UTF-8?
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>
	<mailman.500.1268154470.23598.python-list@python.org>
	<98375575-1071-46af-8ebc-f3c817b47e1d@q23g2000yqd.googlegroups.com>
Message-ID: <hn6092$11n$1@south.jnrs.ja.net>


"C. Benson Manica" <cbmanica at gmail.com> wrote in message 
news:98375575-1071-46af-8ebc-f3c817b47e1d at q23g2000yqd.googlegroups.com...

>The strings come from the same place, i.e. they're exclusively
> normal ASCII characters.

In this case then converting them to/from UTF-8 is a no-op, so
it makes no difference at all. 




From cbmanica at gmail.com  Tue Mar  9 12:31:59 2010
From: cbmanica at gmail.com (C. Benson Manica)
Date: Tue, 9 Mar 2010 09:31:59 -0800 (PST)
Subject: String is ASCII or UTF-8?
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>
	<mailman.500.1268154470.23598.python-list@python.org>
	<98375575-1071-46af-8ebc-f3c817b47e1d@q23g2000yqd.googlegroups.com>
	<hn6092$11n$1@south.jnrs.ja.net>
Message-ID: <1c9b34ab-d949-4d2d-afbd-9a1c41462f0a@g4g2000yqa.googlegroups.com>

On Mar 9, 12:24?pm, "Richard Brodie" <R.Bro... at rl.ac.uk> wrote:
> "C. Benson Manica" <cbman... at gmail.com> wrote in messagenews:98375575-1071-46af-8ebc-f3c817b47e1d at q23g2000yqd.googlegroups.com...
>
> >The strings come from the same place, i.e. they're exclusively
> > normal ASCII characters.
>
> In this case then converting them to/from UTF-8 is a no-op, so
> it makes no difference at all.

Except to the database library, which seems perfectly happy to send an
8-character UTF-8 string to the database as 16 raw characters...


From robert.kern at gmail.com  Tue Mar  9 12:36:48 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 09 Mar 2010 11:36:48 -0600
Subject: String is ASCII or UTF-8?
In-Reply-To: <4B968190.6010208@gmail.com>
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>	<hn5uvd$4i7$1@news.eternal-september.org>
	<4B968190.6010208@gmail.com>
Message-ID: <hn60vg$5pi$1@dough.gmane.org>

On 2010-03-09 11:12 AM, Stef Mientki wrote:
> On 09-03-2010 18:02, Alf P. Steinbach wrote:
>> * C. Benson Manica:
>>> Hours of Googling has not helped me resolve a seemingly simple
>>> question - Given a string s, how can I tell whether it's ascii (and
>>> thus 1 byte per character) or UTF-8 (and two bytes per character)?
>>> This is python 2.4.3, so I don't have getsizeof available to me.
>>
>> Generally, if you need 100% certainty then you can't tell the encoding
>> from a sequence of byte values.
>>
>> However, if you know that it's EITHER ascii or utf-8 then the presence
>> of any value above 127 (or, for signed byte values, any negative
>> values), tells you that it can't be ascii,
> AFAIK it's completely impossible.
> UTF-8 characters have 1 to 4 bytes / byte.
> I can create ASCII strings containing byte values between 127 and 255.

No, you can't. ASCII strings only have characters in the range 0..127. You could 
create Latin-1 (or any number of the 8-bit encodings out there) strings with 
characters 0..255, yes, but not ASCII.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From askedrelic at gmail.com  Tue Mar  9 12:37:12 2010
From: askedrelic at gmail.com (Matthew Behrens)
Date: Tue, 9 Mar 2010 12:37:12 -0500
Subject: Are there in Python some static web site generating tools like 
	webgen, nanoc or webby in Ruby ?
In-Reply-To: <hn50ud$27u$1@dough.gmane.org>
References: <hn50ud$27u$1@dough.gmane.org>
Message-ID: <75d625cc1003090937t24c2dbe7u9a61e5a9a2107d19@mail.gmail.com>

> I like this tools, I'm wonder if there are similar tools in Python ?

Blogofile is a static file blog engine/compiler, inspired by Jekyll.

http://blogofile.com/
http://github.com/EnigmaCurry/blogofile


From tjreedy at udel.edu  Tue Mar  9 12:59:16 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 09 Mar 2010 12:59:16 -0500
Subject: String is ASCII or UTF-8?
In-Reply-To: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>
Message-ID: <hn629g$bsb$1@dough.gmane.org>

On 3/9/2010 11:54 AM, C. Benson Manica wrote:
> Hours of Googling has not helped me resolve a seemingly simple
> question - Given a string s, how can I tell whether it's ascii (and
> thus 1 byte per character) or UTF-8 (and two bytes per character)?

Utf-8 is an encoding that uses 1 to 4 bytes per character.
So it is not clear what you are asking. Alf answered one of the possible 
questions.

> This is python 2.4.3, so I don't have getsizeof available to me.




From rschroev_nospam_ml at fastmail.fm  Tue Mar  9 13:13:07 2010
From: rschroev_nospam_ml at fastmail.fm (Roel Schroeven)
Date: Tue, 09 Mar 2010 19:13:07 +0100
Subject: String is ASCII or UTF-8?
In-Reply-To: <1c9b34ab-d949-4d2d-afbd-9a1c41462f0a@g4g2000yqa.googlegroups.com>
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>
	<mailman.500.1268154470.23598.python-list@python.org>
	<98375575-1071-46af-8ebc-f3c817b47e1d@q23g2000yqd.googlegroups.com>
	<hn6092$11n$1@south.jnrs.ja.net>
	<1c9b34ab-d949-4d2d-afbd-9a1c41462f0a@g4g2000yqa.googlegroups.com>
Message-ID: <Tcwln.240526$X_6.30742@newsfe22.ams2>

Op 2010-03-09 18:31, C. Benson Manica schreef:
> On Mar 9, 12:24 pm, "Richard Brodie" <R.Bro... at rl.ac.uk> wrote:
>> "C. Benson Manica" <cbman... at gmail.com> wrote in messagenews:98375575-1071-46af-8ebc-f3c817b47e1d at q23g2000yqd.googlegroups.com...
>>
>>> The strings come from the same place, i.e. they're exclusively
>>> normal ASCII characters.
>>
>> In this case then converting them to/from UTF-8 is a no-op, so
>> it makes no difference at all.
> 
> Except to the database library, which seems perfectly happy to send an
> 8-character UTF-8 string to the database as 16 raw characters...

In that case I think you mean UTF-16 or UCS-2 instead of UTF-8. UTF-16
uses 2 or more bytes per character, UCS-2 always uses 2 bytes per
character. UTF-8 uses 1 or more bytes per character.

If your texts are in a Western language, the second byte will be zero in
most characters; you could check for that (but note that the second byte
might be the first one in the byte stream, depending on the byte ordering).

HTH,
Roel

-- 
The saddest aspect of life right now is that science gathers knowledge
faster than society gathers wisdom.
  -- Isaac Asimov

Roel Schroeven


From pruebauno at latinmail.com  Tue Mar  9 13:24:27 2010
From: pruebauno at latinmail.com (nn)
Date: Tue, 9 Mar 2010 10:24:27 -0800 (PST)
Subject: related lists mean value (golfed)
References: <mailman.470.1268087649.23598.python-list@python.org> 
	<hn5801$sps$1@news.urz.uni-heidelberg.de>
	<hn5ad7$t8a$1@news.urz.uni-heidelberg.de> 
	<hn5dbo$ih6$02$1@news.t-online.com>
	<hn5npf$2kg$1@news.urz.uni-heidelberg.de> 
	<hn5rt6$6m1$03$1@news.t-online.com>
Message-ID: <62af4b09-77f6-47ab-bce0-2cfcbafecfed@c16g2000yqd.googlegroups.com>



Peter Otten wrote:
> Michael Rudolf wrote:
>
> > Am 09.03.2010 13:02, schrieb Peter Otten:
> >>>>> [sum(a for a,b in zip(x,y) if b==c)/y.count(c)for c in y]
> >> [1.5, 1.5, 8.0, 4.0, 4.0, 4.0]
> >> Peter
> >
> > ... pwned.
> > Should be the fastest and shortest way to do it.
>
> It may be short, but it is not particularly efficient. A dict-based approach
> is probably the fastest. If y is guaranteed to be sorted itertools.groupby()
> may also be worth a try.
>
> $ cat tmp_average_compare.py
> from __future__ import division
> from collections import defaultdict
> try:
>     from itertools import izip as zip
> except ImportError:
>     pass
>
> x = [1 ,2, 8, 5, 0, 7]
> y = ['a', 'a', 'b', 'c', 'c', 'c' ]
>
> def f(x=x, y=y):
>     p = defaultdict(int)
>     q = defaultdict(int)
>     for a, b in zip(x, y):
>         p[b] += a
>         q[b] += 1
>     return [p[b]/q[b] for b in y]
>
> def g(x=x, y=y):
>     return [sum(a for a,b in zip(x,y)if b==c)/y.count(c)for c in y]
>
> if __name__ == "__main__":
>     print(f())
>     print(g())
>     assert f() == g()
> $ python3 -m timeit -s 'from tmp_average_compare import f, g' 'f()'
> 100000 loops, best of 3: 11.4 usec per loop
> $ python3 -m timeit -s 'from tmp_average_compare import f, g' 'g()'
> 10000 loops, best of 3: 22.8 usec per loop
>
> Peter


I converged to the same solution but had an extra reduction step in
case there were a lot of repeats in the input. I think it is a good
compromise between efficiency, readability and succinctness.

x = [1 ,2, 8, 5, 0, 7]
y = ['a', 'a', 'b', 'c', 'c', 'c' ]
from collections import defaultdict
totdct = defaultdict(int)
cntdct = defaultdict(int)
for name, num in zip(y,x):
   totdct[name] += num
   cntdct[name] += 1
avgdct = {name : totdct[name]/cnts for name, cnts in cntdct.items()}
w = [avgdct[name] for name in y]



From stefan_ml at behnel.de  Tue Mar  9 14:19:44 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 09 Mar 2010 20:19:44 +0100
Subject: Are there in Python some static web site generating tools like
	webgen, nanoc or webby in Ruby ?
In-Reply-To: <hn50ud$27u$1@dough.gmane.org>
References: <hn50ud$27u$1@dough.gmane.org>
Message-ID: <hn670h$nt$1@dough.gmane.org>

KLEIN St?phane, 09.03.2010 09:30:
> Today, I've show this static web site generating tools writed in ruby :
>
>   * http://webgen.rubyforge.org/index.html
>   * http://nanoc.stoneship.org/about/
>   * http://webby.rubyforge.org/tutorial/
>
> I like this tools, I'm wonder if there are similar tools in Python ?

Here's a still incomplete but not so short list of web frameworks in Python:

http://wiki.python.org/moin/WebFrameworks

You might be interested in the templating frameworks if all you want is 
generate static pages.

Stefan



From tavares at fe.up.pt  Tue Mar  9 14:25:57 2010
From: tavares at fe.up.pt (tavares at fe.up.pt)
Date: Tue, 9 Mar 2010 11:25:57 -0800 (PST)
Subject: ICNAAM 2010 Mini-Symposium on Computational Bioimaging and 
	Visualization
Message-ID: <be6a5505-df04-44f4-b139-8435379d0597@j27g2000yqn.googlegroups.com>

Dear Colleague,

Within the ICNAAM 2010 - 8th International Conference of Numerical
Analysis and Applied Mathematics (http://www.icnaam.org), to be held
in Rhodes, Greece, on 19-25 September 2010, we are organizing the Mini-
Symposium on ?Computational Bioimaging and Visualization?.
Due to your research activities in the related fields, we would like
to invite you to submit an invited extended abstract to our mini-
symposium. Your contribution is mostly welcomed, and we would be
honoured if you could accept this invitation.


TOPICS OF INTEREST (not restricted to):

- Image Processing and Analysis for Computational Bioimaging and
Visualization;
- Biomedical Signal and Image Acquisition and Processing;
- Data Processing, Modeling and Analysis;
- Scientific Visualization;
- Enhanced Visualization;
- Human Computer Interaction;
- Simulation and Animation;
- Virtual Reality;
- Computer Aided Diagnosis, Surgery, Therapy, Treatment and
Telemedicine Systems;
- Software Development for Computational Bioimaging and Visualization;
- Grid Computing in Computational Bioimaging and Visualization;
- Applications of Computational Bioimaging and Visualization.


IMPORTANT DATES:

Deadline for Submission of Extended Abstract: July 22, 2010;
Notification of acceptance: July 29, 2010;
Deadline for Submission of the source files of the camera ready
extended abstracts to American Institute of Physics (AIP Conference
Proceedings): August 1, 2010.

SUBMISSION INSTRUCTIONS:

Extended abstracts will be published in a Special Volume of the AIP
Conference Proceedings.
Please, see the Instructions for Authors at: http://www.icnaam.org/abstract.htm,
and select the Mini-Symposium on ?Computational Bioimaging and
Visualization? when submitting your contribution.


With kind regards,

Jo?o Manuel R. S. Tavares, University of Porto, Portugal,
tavares at fe.up.pt
Renato Natal Jorge, University of Porto, Portugal, rnatal at fe.up.pt
(Organizers of the Mini-Symposium on ?Computational Bioimaging and
Visualization?)


From tarekamr at gmail.com  Tue Mar  9 15:31:15 2010
From: tarekamr at gmail.com (tarekamr at gmail.com)
Date: Tue, 9 Mar 2010 12:31:15 -0800 (PST)
Subject: Pyrhon2.5 to 2.4 conversion
References: <739740b0-802d-4f1b-8c09-c9094242ffad@g10g2000yqh.googlegroups.com>
	<mailman.4.1267323133.23598.python-list@python.org>
Message-ID: <8676dc2a-2246-4fcb-8736-e6effeddbcad@b7g2000yqd.googlegroups.com>

Thanks a lot everybody for your help, it worked now :)

On Feb 28, 4:12?am, MRAB <pyt... at mrabarnett.plus.com> wrote:
> tarek... at gmail.com wrote:
> > Hi,
>
> > I am currently using oauth2.py library, and it works fine on one of my
> > PC's (python2.5), but later on when I tried to use it with python2.4
> > the following line (line 332 inhttp://github.com/simplegeo/python-oauth2/blob/master/oauth2/__init__.py)
> > showed a syntax error
>
> > items = [(k, v if type(v) != ListType else sorted(v)) for k,v in
> > sorted(self.items()) if k != 'oauth_signature']
>
> > So it there a way to convert this line to a python2.4 compliant
> > syntax.
>
> I think the clearest is:
>
> items = []
> for k, v in sorted(self.items()):
> ? ? ?if k != 'oauth_signature':
> ? ? ? ? ?if type(v) == ListType:
> ? ? ? ? ? ? ?v = sorted(v)
> ? ? ? ? ?items.append((k, v))



From martin at v.loewis.de  Tue Mar  9 15:44:54 2010
From: martin at v.loewis.de (Martin v. Loewis)
Date: Tue, 09 Mar 2010 21:44:54 +0100
Subject: String is ASCII or UTF-8?
In-Reply-To: <mailman.501.1268154771.23598.python-list@python.org>
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>	<hn5uvd$4i7$1@news.eternal-september.org>
	<mailman.501.1268154771.23598.python-list@python.org>
Message-ID: <4B96B346.2050700@v.loewis.de>

> I can create ASCII strings containing byte values between 127 and 255.

No, you can't - or what you create wouldn't be an ASCII string, by
definition of ASCII.

Regards,
Martin


From see at sig.for.address  Tue Mar  9 15:52:03 2010
From: see at sig.for.address (Victor Eijkhout)
Date: Tue, 9 Mar 2010 14:52:03 -0600
Subject: scipy sparse matrix question
References: <1jf28jr.7abra61nwu04pN%see@sig.for.address>
	<mailman.511.1268155244.23598.python-list@python.org>
Message-ID: <1jf3d8v.crydq1be5um2N%see@sig.for.address>

Terry Reedy <tjreedy at udel.edu> wrote:

> > My specific question: what does "for x in A" give me when A is a sparse
> > matrix?
> 
> Try it and see what you get.

Ah, how do I see what I get? If I print it it looks plausible, but I
don't know how to pull it apart. It doesn't seem to be an array.

Victor.

-- 
Victor Eijkhout -- eijkhout at tacc utexas edu


From gagsl-py2 at yahoo.com.ar  Tue Mar  9 15:56:24 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 09 Mar 2010 17:56:24 -0300
Subject: How to detect C Function block using python
References: <769249.71022.qm@web62401.mail.re1.yahoo.com>
Message-ID: <op.u9bi4a0vx6zn5v@lepton.softlabbsas.com.ar>

En Tue, 09 Mar 2010 04:51:57 -0300, Faheem <faheem_imt at yahoo.com> escribi?:

> I'm new in this community. I am writing a static analyzer for validating  
> C Code using python and for that I'm looking for a python module/API  
> that will detect Function block of a given C-File. I know simple  
> function can be detected using push "{" and poping it if character "}"  
> is found. This solution is actually done already, I want a robust API  
> that can do more then that like detecting Function name parameters its  
> return types etc.

Take a look at ctypeslib [1]; it uses gccxml [2] to parse .h header files  
and generate equivalent Python declarations.

[1] http://svn.python.org/view/ctypes/trunk/ctypeslib/
[2] http://www.gccxml.org/

-- 
Gabriel Genellina



From robert.kern at gmail.com  Tue Mar  9 16:13:23 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 09 Mar 2010 15:13:23 -0600
Subject: scipy sparse matrix question
In-Reply-To: <1jf3d8v.crydq1be5um2N%see@sig.for.address>
References: <1jf28jr.7abra61nwu04pN%see@sig.for.address>	<mailman.511.1268155244.23598.python-list@python.org>
	<1jf3d8v.crydq1be5um2N%see@sig.for.address>
Message-ID: <hn6dlk$rnk$1@dough.gmane.org>

On 2010-03-09 14:52 PM, Victor Eijkhout wrote:
> Terry Reedy<tjreedy at udel.edu>  wrote:
>
>>> My specific question: what does "for x in A" give me when A is a sparse
>>> matrix?
>>
>> Try it and see what you get.
>
> Ah, how do I see what I get? If I print it it looks plausible, but I
> don't know how to pull it apart. It doesn't seem to be an array.

In [5]: I = sparse.csr_matrix(np.eye(4))

In [6]: list(I)
Out[6]:
[<1x4 sparse matrix of type '<type 'numpy.float64'>'
         with 1 stored elements in Compressed Sparse Row format>,
  <1x4 sparse matrix of type '<type 'numpy.float64'>'
         with 1 stored elements in Compressed Sparse Row format>,
  <1x4 sparse matrix of type '<type 'numpy.float64'>'
         with 1 stored elements in Compressed Sparse Row format>,
  <1x4 sparse matrix of type '<type 'numpy.float64'>'
         with 1 stored elements in Compressed Sparse Row format>]

What is unclear about that? They are obviously 1x4 sparse matrices, i.e. the 
rows of the matrix. Use the .indices and .data attributes to get the indices of 
the nonzero values and the corresponding values.

Details may differ depending on the format of sparse matrix. Some aren't even 
iterable.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From anfedorov at gmail.com  Tue Mar  9 16:26:52 2010
From: anfedorov at gmail.com (Andrey Fedorov)
Date: Tue, 9 Mar 2010 16:26:52 -0500
Subject: Down casting Python objects
Message-ID: <7659cab31003091326i6f3ab6bta3b8f5948ab7b0ff@mail.gmail.com>

So I have `x', a instance of class `Foo'. I also have class `Bar', a class
extending `Foo' with a couple of methods. I'd like to "down cast" x as
efficiently as possible. Is it OK to just set `x.__class__ = Bar' and expect
things to work OK in all major versions of CPython?
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From art at hens-teeth.net  Tue Mar  9 16:28:54 2010
From: art at hens-teeth.net (Art Zemon)
Date: Tue, 09 Mar 2010 15:28:54 -0600
Subject: CSV DictReader loops when used with MySQLdb
Message-ID: <4B96BD96.5010605@hens-teeth.net>

I'm going crazy.

Using python 2.5.2 on 64 bit Linux.

I have a class which reads CSV files using the CSV DictReader. If I
print the rows, everything works perfectly. If I insert the rows into a
MySQL table using MySQLdb, the DictReader loops back and begins
re-reading from the beginning of the file when it reaches EOF.

Here's the code:

class CsvLoader:
    """load data from a CSV file into a corresponding MySQL table"""

    def __init__(self, fname, schema, db, useCleanReader = False):
        self.schema = schema
        self.db = db
        if useCleanReader:
            self.reader = csv.DictReader(CleanReader(fname),
delimiter=',', quotechar='"')
        else:
            self.reader = csv.DictReader(open(fname), delimiter=',',
quotechar='"')
   
    def loadMysql(self):
        for row in self.reader:
            self.db.insertGeneric(self.schema.tableName(), row)

    def printRows(self):
        for row in self.reader:
            print "\n", row

and here is the insertGeneric method:

    def insertGeneric(self, table, record):
        """execute a generic INSERT, given a dict as input"""
        fieldList = []
        valueList = []
        for k in record.keys():
            fieldList.append(k)
            valueList.append(record[k])
        fields = ", ".join(fieldList)
        m = ['%s']
        valueMarkers = ", ".join(m * len(valueList))  # create a string
like: %s, %s, %s...
        sql = 'insert into %s (%s) values (%s)' % (table, fields,
valueMarkers)
        cursor = self.conn.cursor()
        print "+++ insert: %s <= %s" % (sql, valueList)
        cursor.execute(sql, valueList)
        cursor.close()

useCleanReader is False
CsvLoader.printRows() works fine.
CsvLoader.loadMySql() keeps looping through the CSV file.

Ideas?

    -- Art Z.

-- 

Art Zemon, President
Hen's Teeth Network <http://www.hens-teeth.net/>
Phone: (866)HENS-NET or (636)447-3030 ext. 200
Twitter: AZemon <http://twitter.com/AZemon>

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From stef.mientki at gmail.com  Tue Mar  9 16:36:08 2010
From: stef.mientki at gmail.com (Stef Mientki)
Date: Tue, 09 Mar 2010 22:36:08 +0100
Subject: String is ASCII or UTF-8?
In-Reply-To: <hn60vg$5pi$1@dough.gmane.org>
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>	<hn5uvd$4i7$1@news.eternal-september.org>	<4B968190.6010208@gmail.com>
	<hn60vg$5pi$1@dough.gmane.org>
Message-ID: <4B96BF48.7080201@gmail.com>

On 09-03-2010 18:36, Robert Kern wrote:
> On 2010-03-09 11:12 AM, Stef Mientki wrote:
>> On 09-03-2010 18:02, Alf P. Steinbach wrote:
>>> * C. Benson Manica:
>>>> Hours of Googling has not helped me resolve a seemingly simple
>>>> question - Given a string s, how can I tell whether it's ascii (and
>>>> thus 1 byte per character) or UTF-8 (and two bytes per character)?
>>>> This is python 2.4.3, so I don't have getsizeof available to me.
>>>
>>> Generally, if you need 100% certainty then you can't tell the encoding
>>> from a sequence of byte values.
>>>
>>> However, if you know that it's EITHER ascii or utf-8 then the presence
>>> of any value above 127 (or, for signed byte values, any negative
>>> values), tells you that it can't be ascii,
>> AFAIK it's completely impossible.
>> UTF-8 characters have 1 to 4 bytes / byte.
>> I can create ASCII strings containing byte values between 127 and 255.
>
> No, you can't. ASCII strings only have characters in the range 0..127. 
> You could create Latin-1 (or any number of the 8-bit encodings out 
> there) strings with characters 0..255, yes, but not ASCII.
>
Probably, and according to wikipedia you're right.
I think I've to get rid of my old books,
Borland turbo Pascal 4 (1987) has an ASCII table of 256 characters,
while the small letters say 7-bit  ;-)

cheers,
Stef
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From bringa at gmail.com  Tue Mar  9 16:41:10 2010
From: bringa at gmail.com (Daniel Klein)
Date: Tue, 9 Mar 2010 13:41:10 -0800 (PST)
Subject: Named loops for breaking
Message-ID: <6d6a35e8-f09c-4792-8abe-5a0dc24d214e@g28g2000yqh.googlegroups.com>

Hey,

I did a little searching and couldn't really find much recent on this.
The only thing I found was this:

http://groups.google.com/group/comp.lang.python/browse_thread/thread/a696624c92b91181/5b7479fdc3362b83?lnk=gst&q=break+named+loop#5b7479fdc3362b83

Basically I'm wondering if there are any plans to implemented named
loops in Python, so I can tell a break command to break out of a
specific loop in the case of nested loops. Currently I'm using boolean
flag variables, but I find that very clumsy. I know this idea of
breaking out of specific loops from javascript; I guess java does it
too. It just seems a very Pythonian idea to me: clear, promotes code
legibility, seems obvious.


From shengcer at gmail.com  Tue Mar  9 16:48:42 2010
From: shengcer at gmail.com (Shane)
Date: Tue, 9 Mar 2010 13:48:42 -0800 (PST)
Subject: How to dynamic insert more conditional statements into a function
Message-ID: <93ea751a-9d23-4186-897c-c2b079cc5c6c@e1g2000yqh.googlegroups.com>

Hi I am a newbie for Python

Here is a question, say I have a list L,

function foo is:

def foo(L):
    if L[0] > 0: return True

if later I want another function goo which returns "True" when L[0]
and L[1] are both > 0, i.e.,

def goo(L):
    if L[0] > 0 and L[1] > 0: return True

Can anybody tell me how can I write the function "goo" based upon the
function "foo"? Thanks!
I know if it is implementable, I should use "decorator". But I just
cannot figure out how.


From no.email at nospam.invalid  Tue Mar  9 16:58:01 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Tue, 09 Mar 2010 13:58:01 -0800
Subject: Named loops for breaking
References: <6d6a35e8-f09c-4792-8abe-5a0dc24d214e@g28g2000yqh.googlegroups.com>
Message-ID: <7xocixximu.fsf@ruckus.brouhaha.com>

Daniel Klein <bringa at gmail.com> writes:
> Basically I'm wondering if there are any plans to implemented named
> loops in Python, so I can tell a break command to break out of a
> specific loop in the case of nested loops. Currently I'm using boolean
> flag variables, but I find that very clumsy.

The usual way to do this in Python is with an exception, perhaps a
specially named one if that makes your code clearer:

  class Whatever(Exception): pass
  ... 
  try:
    for x in thingie:
      for y in x.whatsis():
        if lose(y): raise Whatever
        ...
  except Whatever: pass

This situation doesn't come up all that often and you should
probably ask yourself if you really need those nested loops.

You might also be able to put the nested loop structure into a
function that you can then exit with a return statement.


From ccurvey at gmail.com  Tue Mar  9 17:05:15 2010
From: ccurvey at gmail.com (Chris Curvey)
Date: Tue, 9 Mar 2010 14:05:15 -0800 (PST)
Subject: find text location (in pixels) using python (pyPdf)
Message-ID: <fc521bf2-46dd-445d-b292-12d2adef1bec@f8g2000yqn.googlegroups.com>

Has anyone ever tried to find the pixel (or point) location of text in
a PDF using Python?  I've been using the pyPdf libraries for other
things, and it seems to me that if I can find the bounding box for
text, I should be able to calculate the location.

What I want to do is take a PDF of one of our vendor invoices and blur
everything in it except the block that's related to a single
customer.  So if I have an invoice that looks like:

Alfred Annoying
123 Elm St
Somewhere, NJ
$100

Barbie Bonehead
456 Pine St
Elsewhere, NJ
$125

Charlie Clueless
789 Beech St.
Everywhere, NJ
$150

I want to show Barbie just her section of the invoice (with the header
intact, so that she can tell it's a real invoice) but with Alfred and
Charlie's information blurred out.  I was going to convert the PDF to
a JPG or PNG and do the blurring with ImageMagick/PythonMagick.  But
that requires me to know the pixel location of the regions that I want
blurred and left alone.

I'm also open to other ideas if I'm going about this the hard way....


From donal.k.fellows at man.ac.uk  Tue Mar  9 17:06:39 2010
From: donal.k.fellows at man.ac.uk (Donal K. Fellows)
Date: Tue, 9 Mar 2010 14:06:39 -0800 (PST)
Subject: Updates about Tk
References: <4b88d215$0$1105$4fafbaef@reader4.news.tin.it> 
	<6adc$4b895233$4275d90a$6509@FUSE.NET>
	<d6f9d8e2-3379-4add-bffd-0f058ccd6fd8@19g2000yqu.googlegroups.com>
Message-ID: <6aa37d52-13a0-4c1b-9304-d301ed8f8c63@q23g2000yqd.googlegroups.com>

On Feb 27, 5:29?pm, rantingrick <rantingr... at gmail.com> wrote:
> Great post Kevin! The only thing i would like to add are my two
> favorite references for learning Tkinter. They are not geared around
> the new ttk stuff, but still 95% relevant to any Tkinter-ing
>
> http://effbot.org/tkinterbook/
> http://infohost.nmt.edu/tcc/help/pubs/tkinter/

You might also want to check out:

  http://www.tkdocs.com/

Which covers the ttk widgets too (and, for multi-language people, it
also handles how to do it from four languages).

Donal.


From emile at fenx.com  Tue Mar  9 17:15:18 2010
From: emile at fenx.com (Emile van Sebille)
Date: Tue, 09 Mar 2010 14:15:18 -0800
Subject: String is ASCII or UTF-8?
In-Reply-To: <4B96BF48.7080201@gmail.com>
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>	<hn5uvd$4i7$1@news.eternal-september.org>	<4B968190.6010208@gmail.com>	<hn60vg$5pi$1@dough.gmane.org>
	<4B96BF48.7080201@gmail.com>
Message-ID: <hn6h8q$au8$1@dough.gmane.org>

On 3/9/2010 1:36 PM Stef Mientki said...
> On 09-03-2010 18:36, Robert Kern wrote:

<snip>

>> No, you can't. ASCII strings only have characters in the range 0..127.
>> You could create Latin-1 (or any number of the 8-bit encodings out
>> there) strings with characters 0..255, yes, but not ASCII.
>>
> Probably, and according to wikipedia you're right.

I too looked at wikipedia, and it seems historically incomplete to me. 
In particular, I looked for 'high order ascii', which, when I was 
working with Basic Four in the '70's, is what they used.  Essentially, 
the high order bit was set for all characters to make 8A a line feed, 
etc.  Still the same 0..127 characters, but not really an extended ascii 
which is where wikipedia forwards you to.

I remember having to strap the eighth bit high when I reused the older 
line printers to get them to work.

Emile




From emile at fenx.com  Tue Mar  9 17:21:37 2010
From: emile at fenx.com (Emile van Sebille)
Date: Tue, 09 Mar 2010 14:21:37 -0800
Subject: How to dynamic insert more conditional statements into a function
In-Reply-To: <93ea751a-9d23-4186-897c-c2b079cc5c6c@e1g2000yqh.googlegroups.com>
References: <93ea751a-9d23-4186-897c-c2b079cc5c6c@e1g2000yqh.googlegroups.com>
Message-ID: <hn6hkl$c82$1@dough.gmane.org>

On 3/9/2010 1:48 PM Shane said...
> Hi I am a newbie for Python
>
> Here is a question, say I have a list L,
>
> function foo is:
>
> def foo(L):
>      if L[0]>  0: return True
>
> if later I want another function goo which returns "True" when L[0]
> and L[1] are both>  0, i.e.,
>
> def goo(L):
>      if L[0]>  0 and L[1]>  0: return True


Here's one way...

def foo(L,deep=0):
     return L[0] and not deep or foo(L[1:],deep-1)

Subject to clean up.

Emile



From gramos at yahoo.com  Tue Mar  9 17:53:50 2010
From: gramos at yahoo.com (brown wrap)
Date: Tue, 9 Mar 2010 14:53:50 -0800 (PST)
Subject: Can't build hashlib 
In-Reply-To: <fc521bf2-46dd-445d-b292-12d2adef1bec@f8g2000yqn.googlegroups.com>
Message-ID: <865538.86264.qm@web111703.mail.gq1.yahoo.com>




The md5 module is used in build xulrunner and Firefox from source. When I do run the install its says md5 no such module. I compiled Python 2.6.4 after installing openssl and BerkleyDB, yet I get this error when compilying Python:

Failed to find the necessary bits to build these modules:
_tkinter           bsddb185           dl              
imageop            sunaudiodev                        
To find the necessary bits, look in setup.py in detect_modules() for the module's name.


Failed to build these modules:
_hashlib           _ssl                               




      


From sluggoster at gmail.com  Tue Mar  9 18:18:11 2010
From: sluggoster at gmail.com (Mike Orr)
Date: Tue, 9 Mar 2010 15:18:11 -0800 (PST)
Subject: equivalent of Ruby's Pathname?
References: <843d5af9-e8db-4352-a853-4c99664eadf8@k6g2000prg.googlegroups.com>
	<dcace5fc-5ae9-4756-942d-6da7da2f660d@s36g2000prh.googlegroups.com> 
	<hkq3lv$7k2$1@panix5.panix.com>
	<8fc356e0-f3ed-4a67-9b37-f21561cef4a5@p13g2000pre.googlegroups.com>
	<hl9n2c$9r6$1@panix5.panix.com>
Message-ID: <73dcf2e2-a391-4c7a-9ded-b1ab156ad59f@u19g2000prh.googlegroups.com>

I just saw this thread on the Python-URL.

On Feb 14, 12:39?pm, a... at pythoncraft.com (Aahz) wrote:
> >> Sean DiZazzo =A0<half.ital... at gmail.com> wrote:
>
> >>>Why did Path() get rejected? Is it the idea itself, or just the
> >>>approach that was used? What are the complaints?
>
> >> You should search for the discussiona around it.
>
> >I read the discussion, and there was definitely some going back and
> >forth on whether it should be sub-classed from string, but the
> >conversation just seemed to stop abruptly with no decision one way of
> >the other. ?Maybe I missed a thread.

It has a habit of being discussed and dropped repeatedly. The main
issue is that Guido doesn't see an OO approach as necessarily better
than the existing functions, so it has a high bar for acceptance. One
issue is that some people see a need to separate filesystem-
independent functionality (joining paths and extracting components)
from filesystem-dependent functionality (listing directories, removing
files, etc). ``path.py`` and PEP 355 were rejected mainly because of
this. There was support for a small filesystem-independent class that
could be put into the stdlib, and some modest moving/renaming of the
filesystem functions (which are scattered across os, os.path, shutil,
glob, etc). We were hoping to get this done for Python 3 but didn't
make it. I wrote a ``Unipath`` package that tried to be a compromise
between what everybody wanted, with a FS-independent class and a FS-
dependent subclass, but could not get any feedback on it. Somebody
else was going to write a PEP for the renamings, but I never saw it.

Since then, path.py has been included in a couple packages and seems
to have the most widespread use. I gave up on the stdlib and
reconfigured Unipath as a pure 3rd-party library. (The FS-independent
AbstractPath class is still there if anybody wants to use it for a
PEP.) The other people who made their own implementations seemed to be
happy with theirs, and that was that.

The string vs non-string argument has pretty much been decided in
favor of strings (i.e., a string subclass). Not ``"a.txt".open()`` but
``open(Path("a.txt"))``.  Too many standard and 3rd-party modules
expect string paths: you'd have to convert your path to a string every
time you pass it as an argument.  The main problem with string paths
is that .join() means something else, but that's usually solved by
using a different method name: "joinpath", "child", "/", etc.

Other proposals have been a tuple subclass, so that ``Path("a/b/c.txt")
[-1] == Path("c.txt")``, and a library that can do non-native paths
(Windows style on Unix systems and vice-versa). These don't seem to be
in vogue anymore.

What has become more common is virtual paths; i.e., the same interface
for filesystems, FTP, zip files, etc. That was discussed during the
last go-around but there were no implementations. Now there are a few
projects active on this, such as http://groups.google.com/group/stdpyfs
. This is probably the future of any path object, so it would make
sense to define a path now that can work with all these backends.

--Mike


From jcb at iteris.com  Tue Mar  9 18:56:47 2010
From: jcb at iteris.com (Metalone)
Date: Tue, 9 Mar 2010 15:56:47 -0800 (PST)
Subject: file seek is slow
Message-ID: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>

I ran a comparison that timed 1e6 file seeks.
The tests were run with Python 2.6.4 and Microsoft Visual C 6.0 on
Windows XP with an Intel 3GHz single processor with hyperthreading.

Results:
C        : 0.812 seconds
Python: 1.458 seconds.
difference = 0.646 seconds.

If the file.seek is removed the Python loop takes 2ms so the loop
overhead is minimal.
Without pysco the loop overhead is 4.6ms and Python takes 1.866.

Any ideas what is causing the slow down over the 'C' version.

In general I have been trying to take a video application written in C+
+ and make it work in Python.
There seem to be delays in the handoff to Windows System code that
make the Python version just a touch slower in some areas, but these
slowdowns are critically effecting the work.  File seek is not a deal
breaker here, it is just the latest thing I have noticed and the
simplest to demonstrate.


Python version:
import time
def main():
    # write temp file
    SIZE = 1000
    f1 = file('video.txt', 'wb')
    f1.write('+' * SIZE)
    f1.close()

    f1 = file('video.txt', 'rb')
    t0 = time.clock()
    for i in xrange(1000000):
       f1.seek(0)
    delta = time.clock() - t0
    print "%.3f" % delta
    f1.close()

if __name__ == '__main__':
    import psyco
    psyco.full()
    main()

// 'C' version
#include <stdio.h>
#include <time.h>
#define SIZE 1000

static void main(int argc, char *argv[])
{
    FILE *f1;
    int i;
    int t0;
    float delta;
    char buffer[SIZE];

    // write temp file
    memset(buffer, (int)'+', SIZE);
    f1 = fopen("video.txt", "wb");
    fwrite(buffer, SIZE, 1, f1);
    fclose(f1);

    f1 = fopen("video.txt", "rb");
    t0 = clock();
    for (i=0; i < 1000000; i++)
    {
        fseek(f1, 0, SEEK_SET);
    }
    delta = (float)(clock() - t0) / CLOCKS_PER_SEC;
    printf("%.3f\n", delta);
    fclose(f1);
}


From martin.hellwig at dcuktec.org  Tue Mar  9 18:58:01 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Tue, 09 Mar 2010 23:58:01 +0000
Subject: equivalent of Ruby's Pathname?
In-Reply-To: <d871b429-deff-4974-84f3-d5f19c6b9042@u15g2000prd.googlegroups.com>
References: <843d5af9-e8db-4352-a853-4c99664eadf8@k6g2000prg.googlegroups.com>
	<22ac2bce-cf12-45e2-9d89-d7df56a2faa7@b1g2000prc.googlegroups.com>
	<dcace5fc-5ae9-4756-942d-6da7da2f660d@s36g2000prh.googlegroups.com>
	<91770e62-2fef-45c9-9e4d-e64088058af1@g8g2000pri.googlegroups.com>
	<7tceiuF94hU1@mid.individual.net>
	<d871b429-deff-4974-84f3-d5f19c6b9042@u15g2000prd.googlegroups.com>
Message-ID: <hn6na6$2ci$1@news.eternal-september.org>

On 02/09/10 14:00, Phlip wrote:
<cut>
> Ah, now we get down to the root of the problem. Because Python is so
> stuck on the "one best way to do it" mentality, language bigotry
> prevented the Committee from picking from among several equally valid
> but non-best options. And after 20 years of growth, Python still has
> no Pathname class. What a mature community! C-:
>
<cut>
Well even if this statement would be true, I personally think that not 
proclaiming something a 'standard' if you are sure that you are not sure 
about it, is a virtue.

-- 
mph


From ptmcg at austin.rr.com  Tue Mar  9 19:11:35 2010
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Tue, 9 Mar 2010 16:11:35 -0800 (PST)
Subject: file seek is slow
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>
Message-ID: <daf5c75e-8139-4a4a-8c27-5cef00327bb1@o3g2000yqb.googlegroups.com>

This is a pretty tight loop:

for i in xrange(1000000):
       f1.seek(0)

But there is still a lot going on, some of which you can lift out of
the loop.  The easiest I can think of is the lookup of the 'seek'
attribute on the f1 object.  Try this:

f1_seek = f1.seek
for i in xrange(1000000):
       f1_seek(0)

How does that help your timing?

-- Paul


From greg.ewing at canterbury.ac.nz  Tue Mar  9 19:17:48 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Wed, 10 Mar 2010 13:17:48 +1300
Subject: Reverse engineering CRC?
In-Reply-To: <mailman.474.1268090664.23598.python-list@python.org>
References: <7vj7fdFnnjU1@mid.individual.net>	<4b9471ee$0$8836$c3e8da3@news.astraweb.com>	<7vk3eiFtivU1@mid.individual.net>	<mailman.459.1268053659.23598.python-list@python.org>	<7vlameF7goU1@mid.individual.net>
	<mailman.474.1268090664.23598.python-list@python.org>
Message-ID: <7vo661F7s7U1@mid.individual.net>

Dave Angel wrote:

> If you assume it's done in a single pass, and you know which byte is the 
> end of the buffer, I'd think you could learn a lot by just tweaking that 
> last byte.

I'm sure I would, but unfortunately I can't control the
last byte. The bytes that I can influence are some distance
back from the end of the data.

-- 
Greg


From robin.rytich at gmail.com  Tue Mar  9 20:57:47 2010
From: robin.rytich at gmail.com (Robin Rytich)
Date: Wed, 10 Mar 2010 04:57:47 +0300
Subject: Knight's tour Warndorff's algorithm problem
Message-ID: <1268186267.11433.47.camel@rytich-laptop>

Hi all

I'm having some troubles with writing Knight's tour
(http://en.wikipedia.org/wiki/Knight%27s_tour) solution in Python 3. I'm
using Warnsdorff's algorithm (http://en.wikipedia.org/wiki/Knight%
27s_tour#Algorithm) and I'm wondering why it doesn't work with boards of
certain sizes. I've written a solution and I like it but it does not
work correctly for 15x15, 26x26, 27x27 and 32x32 boards (don't know why;
checked from 5x5 to 40x40). So I'd be really glad if you tell me whether
I am too stupid for Python or for Discrete Math? In other words, did I
implemented Warnsdorff's algorithm in Python 3 correctly or maybe all my
troubles are because I haven't read tutorial with enough patience?

P.S. Warnsdorff's algorithm says that it's not really important which
square to choose between those which have equal amount of ways out. In
spite of that I tried to changed my program and added '=' to condition
at line 78. Results were quite surprising: now it works for 5x5,
6x6, ... 34x34 but not for 35x35!
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From wuwei23 at gmail.com  Tue Mar  9 21:10:20 2010
From: wuwei23 at gmail.com (alex23)
Date: Tue, 9 Mar 2010 18:10:20 -0800 (PST)
Subject: Named loops for breaking
References: <6d6a35e8-f09c-4792-8abe-5a0dc24d214e@g28g2000yqh.googlegroups.com>
Message-ID: <41d99d1f-7499-4c3e-8c25-8d58a6c16bd3@c37g2000prb.googlegroups.com>

Daniel Klein <bri... at gmail.com> wrote:
> Basically I'm wondering if there are any plans to implemented named
> loops in Python, so I can tell a break command to break out of a
> specific loop in the case of nested loops.

You should be able to do this with the goto module: http://entrian.com/goto/

But please note that I'm not seriously advocating its use :)


From dr.cg at 126.com  Tue Mar  9 22:36:10 2010
From: dr.cg at 126.com (CHEN Guang)
Date: Wed, 10 Mar 2010 11:36:10 +0800 (CST)
Subject: Six Minutes and fourty two seconds
Message-ID: <5fa8d25e.47df.1274624d257.Coremail.dr.cg@126.com>

>Tobiah wrote:
>> Now that I use python, this is the amount of time 
>> per day that I spend adding forgotten semicolons while
>> debugging other languages.
>>   
>What compels you to write Python code without semicolons?
>Frederic
 
Try the C language without semicolons and braces
http://pythoidc.googlecode.com
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From wuwei23 at gmail.com  Tue Mar  9 23:01:01 2010
From: wuwei23 at gmail.com (alex23)
Date: Tue, 9 Mar 2010 20:01:01 -0800 (PST)
Subject: odd error
References: <bc7f680c1003090555o4d09c7b1l40bb21967d767885@mail.gmail.com> 
	<4B96787B.3030907@timgolden.me.uk>
	<mailman.499.1268153292.23598.python-list@python.org>
Message-ID: <5bfe3bef-3e27-4e46-a3ae-3f029630d80a@c37g2000prb.googlegroups.com>

Alex Hall <mehg... at gmail.com> wrote:
> Why would the sequence
> matter, or does it not and I am doing something else wrong? Here is a
> sample of my dictionary:

Showing us the code that handles the dictionary lookup + function
calling would probably help us a lot more here.


From fukazawa at gmail.com  Wed Mar 10 00:01:48 2010
From: fukazawa at gmail.com (Andy)
Date: Tue, 9 Mar 2010 21:01:48 -0800 (PST)
Subject: pyserial script doesnt execute properly
References: <c083a958-7320-4fd3-82ae-cf4da7808af6@u15g2000prd.googlegroups.com>
	<4b9612bc$0$6059$426a74cc@news.free.fr>
	<bf3cbd2a-eb4c-455c-9b01-de44d6b35f60@v34g2000prm.googlegroups.com>
	<6596caf4-8d36-40b4-8e8d-a5ed2a18f245@z1g2000prc.googlegroups.com>
Message-ID: <9a15f63e-c486-40fd-bd6f-9c328328f0a1@a16g2000pre.googlegroups.com>

Hi Kishore,

Have you tried "ser=serial.Serial(port='COM2', baudrate=9600)" instead
of "port='\\.\COM2'"?

Also, I'd suggest you temporarily define some other parameters that
now you're leaving to default values.  From the documentation of
pyserial:
readline(size=None, eol='\n')

You're sure that your Arduino device is sending a '\n' right after the
'1', aren't you?  Or is it two consecutive '1'?

And another idea:  If this is your first experience with PySerial, I
suggest you first use some free software as counterpart to your
Arduino device in order to confirm the microcontroller is sending
exactly what you think it is sending.  In other words, is it sending
to your Python program '11' or '1\n1\n'?  Also to confirm other
details such as parity bits, baud, etc.

Cheers,
Andy


From showell30 at yahoo.com  Wed Mar 10 00:23:08 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Tue, 9 Mar 2010 21:23:08 -0800 (PST)
Subject: Reverse engineering CRC?
References: <7vj7fdFnnjU1@mid.individual.net>
Message-ID: <3b1dce65-99ed-471a-8494-9eaf0e6d44ad@e19g2000prn.googlegroups.com>

On Mar 7, 7:09?pm, Gregory Ewing <greg.ew... at canterbury.ac.nz> wrote:
> Given some known data/crc pairs, how feasible is it to
> figure out the polynomial being used to generate the crc?
>
> In the case I'm looking at, it appears that the crc
> size may be at least 24 bits, so just trying all possible
> polynomials probably isn't doable.
>
> An article I found hints at the possibility of using
> GCDs to make the search more efficient, but doesn't go
> into any details. Anyone know of any literature about
> this?
>
> If it helps, I have the ability to generate test cases
> with known message contents to some extent, although
> I don't have complete control over the contents. Also
> it's a manual process, so generating large numbers of
> them automatically isn't an option.
>


Hi Greg.  I would at least flip one bit at a time on the first byte of
your data to see if the transformation is bitwise.


From rami.chowdhury at gmail.com  Wed Mar 10 00:24:00 2010
From: rami.chowdhury at gmail.com (Rami Chowdhury)
Date: Tue, 9 Mar 2010 21:24:00 -0800
Subject: Down casting Python objects
In-Reply-To: <7659cab31003091326i6f3ab6bta3b8f5948ab7b0ff@mail.gmail.com>
References: <7659cab31003091326i6f3ab6bta3b8f5948ab7b0ff@mail.gmail.com>
Message-ID: <41B1429F-57E8-4F58-883E-03F20FA9A635@gmail.com>


On Mar 9, 2010, at 13:26 , Andrey Fedorov wrote:

> So I have `x', a instance of class `Foo'. I also have class `Bar', a class extending `Foo' with a couple of methods. I'd like to "down cast" x as efficiently as possible. Is it OK to just set `x.__class__ = Bar' and expect things to work OK in all major versions of CPython? 

Could you tell us *why* you need to down-cast x? Explicit type-casting is usually unnecessary in Python...

-------------
Rami Chowdhury
"Never assume malice when stupidity will suffice." -- Hanlon's Razor
408-597-7068 (US) / 07875-841-046 (UK) / 0189-245544 (BD)

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From stava at telcotec.se  Wed Mar 10 00:31:19 2010
From: stava at telcotec.se (Lars Stavholm)
Date: Wed, 10 Mar 2010 11:01:19 +0530
Subject: pexpect and logging integration
Message-ID: <4B972EA7.50807@telcotec.se>

Hi all,

has anyone managed to integrate pexpect and logging?

I.e., I'd like to be able to pick up the dialog,
commands sent and responses received, in my logging.
I know about the pexpect logfile, and I can log things
to stdout or stderr, but I really need to log using the
python logging library.

Any thoughts appreciated
/Lars



From gagsl-py2 at yahoo.com.ar  Wed Mar 10 00:37:14 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 10 Mar 2010 02:37:14 -0300
Subject: Knight's tour Warndorff's algorithm problem
Message-ID: <op.u9b68cuyx6zn5v@lepton.softlabbsas.com.ar>

El 9 mar, 22:57, Robin Rytich escribi?:

> I'm having some troubles with writing Knight's tour
> (http://en.wikipedia.org/wiki/Knight%27s_tour) solution in Python 3. I'm
> using Warnsdorff's algorithm (http://en.wikipedia.org/wiki/Knight%
> 27s_tour#Algorithm) and I'm wondering why it doesn't work with boards of
> certain sizes. I've written a solution and I like it but it does not
> work correctly for 15x15, 26x26, 27x27 and 32x32 boards (don't know why;
> checked from 5x5 to 40x40).

Warnsdorff's algorithm is heuristic; it works most of the time, but in  
some cases leads to a dead end and you have to backtrack and try another  
alternative.
The starting square is important; if you start at 1,1 (instead of 0,0)  
your program finds a solution for all those problematic board sizes.

> So I'd be really glad if you tell me whether
> I am too stupid for Python or for Discrete Math? In other words, did I
> implemented Warnsdorff's algorithm in Python 3 correctly or maybe all my
> troubles are because I haven't read tutorial with enough patience?

Your implementation looks fine to me. Some comments on the code itself:

> class ChessBoard:
> 	
> 	size = 8   # Board square width and height.
> 	cell = []  # Embedded list of board cells.

This sets a class attribute (as opposed to normal, instance attributes)  
which is shared by all ChessBoard instances (this really should be covered  
in the FAQ!). You really want an instance attribute here: do `self.cell =  
[]` in __init__

> 	def __init__(self):
> 		
> 		import sys
> 		
> 		# Reading board size.
> 		
> 		if len(sys.argv) >= 2:
> 			self.size = int(sys.argv[1])

I would process command line arguments when the script starts, and supply  
size/x/y as parameters to the ChessBoard constructor. In other words, the  
caller must provide those parameters, it's not ChessBoard responsability  
to hunt for them.

> 		if (next != 0):
> 			(self.y, self.x) = (next.y, next.x)

All those six () are unnecessary.

Also, `next` might refer to integer 0 or a ChessBoardSquare instance.  
That's perfectly legal in Python, but *I* prefer to assign objects of the  
same type when using the same variable name. In this case, 0 is used only  
as a marker, any other non-ChessBoardSquare instance would do, and I'd  
substitute None instead.
(This is more than a stylistic whim: some JIT compiler may benefit from  
knowing the object type won't change)

> 	def printField(self):
> 		""" This function prints field to standart output.		for i in  
> range(self.size):
> 			for j in range(self.size):
> 				print(self.cell[i][j].status, end = '')
> 			print()

Instead of artificially iterate over the *indices* to finally reach the  
objects, you may directly iterate over the board squares:

		for row in self.cell:
			for square in row:
				print(square.status, end = '')
			print()

Later:

> 		applicants = [[y - 1, x - 2], [y - 1, x + 2],
> 		              [y + 1, x - 2], [y + 1, x + 2],
> 		              [y - 2, x - 1], [y - 2, x + 1],
> 		              [y + 2, x - 1], [y + 2, x + 1]]
>		result = []
> 		for applicant in applicants:
> 			if applicant[0] < 0 or applicant[0] >= self.size:
> 				continue
> 			if applicant[1] < 0 or applicant[1] >= self.size:
> 				continue
> 			if self.cell[applicant[0]][applicant[1]].status == 0:
> 				result.append(self.cell[applicant[0]][applicant[1]])

It would be better to use meaningful names instead of applicant[0],  
applicant[1] -- let me re-use y,x. We can write a more concise condition:

         result = []
         for y,x in applicants:
             if not 0 <= y < self.size:
                 continue
             if not 0 <= x < self.size:
                 continue
             if self.cell[y][x].status == 0:
                 result.append(self.cell[y][x])

Now, lets combine all those conditions into a single one:

         result = []
         for y,x in applicants:
             if 0 <= y < self.size and 0 <= x < self.size and  
self.cell[y][x].status == 0:
                 result.append(self.cell[y][x])

Finally, a code pattern like the above can always be rewritten as a list  
comprehension:

         result = [self.cell[y][x]
             for y,x in applicants
             if 0 <= y < self.size and 0 <= x < self.size and  
self.cell[y][x].status == 0
             ]

Apart from these points, your program looks fine to me. You even added  
function docstrings! (ok, they might be more informative, but at least  
they exist!)

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Wed Mar 10 01:29:02 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 10 Mar 2010 03:29:02 -0300
Subject: Named loops for breaking
References: <6d6a35e8-f09c-4792-8abe-5a0dc24d214e@g28g2000yqh.googlegroups.com>
Message-ID: <op.u9b9moihx6zn5v@lepton.softlabbsas.com.ar>

En Tue, 09 Mar 2010 18:41:10 -0300, Daniel Klein <bringa at gmail.com>  
escribi?:

> Basically I'm wondering if there are any plans to implemented named
> loops in Python, so I can tell a break command to break out of a
> specific loop in the case of nested loops.

See PEP3136 [1] and its rejection note [2]
I think you may find some more discussion in the python-ideas list.

> Currently I'm using boolean
> flag variables, but I find that very clumsy. I know this idea of
> breaking out of specific loops from javascript; I guess java does it
> too. It just seems a very Pythonian idea to me: clear, promotes code
> legibility, seems obvious.

Although I've occasionally missed the feature myself, I agree with Guido's  
arguments against it. You have several alternatives: refactor the loop  
into an auxiliary function, use a specific exception, add boolean flags,  
or repeat the test at the outer levels. (I usually choose the first).

[1] http://www.python.org/dev/peps/pep-3136/
[2] http://mail.python.org/pipermail/python-3000/2007-July/008663.html

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Wed Mar 10 01:35:12 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 10 Mar 2010 03:35:12 -0300
Subject: How to dynamic insert more conditional statements into a function
References: <93ea751a-9d23-4186-897c-c2b079cc5c6c@e1g2000yqh.googlegroups.com>
Message-ID: <op.u9b9wyc9x6zn5v@lepton.softlabbsas.com.ar>

En Tue, 09 Mar 2010 18:48:42 -0300, Shane <shengcer at gmail.com> escribi?:

> Hi I am a newbie for Python
>
> Here is a question, say I have a list L,
>
> function foo is:
>
> def foo(L):
>     if L[0] > 0: return True
>
> if later I want another function goo which returns "True" when L[0]
> and L[1] are both > 0, i.e.,
>
> def goo(L):
>     if L[0] > 0 and L[1] > 0: return True
>
> Can anybody tell me how can I write the function "goo" based upon the
> function "foo"? Thanks!
> I know if it is implementable, I should use "decorator". But I just
> cannot figure out how.

To implement goo based on foo:

def goo(L):
   if foo(L) and L[1]>0: return True

I don't see how to use a decorator here - maybe your example became too  
simple to be useful. A more realistic use case?

-- 
Gabriel Genellina



From agoretoy at gmail.com  Wed Mar 10 01:58:13 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Wed, 10 Mar 2010 00:58:13 -0600
Subject: datelib pythonification
In-Reply-To: <b11a98b1-4e43-4d74-88d7-9b24cd0743ed@o16g2000prh.googlegroups.com>
References: <c9d33c541002201626o4cb51819ycea15bb24933d5d@mail.gmail.com> 
	<mailman.15.1266716296.4577.python-list@python.org>
	<b11a98b1-4e43-4d74-88d7-9b24cd0743ed@o16g2000prh.googlegroups.com>
Message-ID: <c9d33c541003092258o820adf7i2ec916b5eb035051@mail.gmail.com>

>
> DATE_TYPE = type(date.today())

def dates_diff(self, *targs):

   nargs = len(targs)

   if nargs == 0:

       return self.enddate - self.startdate

   if nargs == 1:

       arg = targs[0]

       if not isinstance(arg, (list, tuple)) or len(arg) != 2:

           raise Exception(

               "single arg must be list or tuple of length 2")

       start, end = arg

   elif nargs == 2:

       start, end = targs

   else:

       raise Exception("expected 0,1, or 2 args; found %d" % nargs)

   if isinstance(start, DATE_TYPE) and isinstance(end, DATE_TYPE):

       return end - start

   raise Exception("both values must be of type DATE_TYPE")


> HTH,


> John


This is awesome. Thank you for your contribution. I wasn't sure anyone was
gonna reply; just saw your reply, pardon my delay. I will make the changes
you suggested to other functions that apply in the lib as well(mimic that
style of coding). Make it so it raises exceptions instead of failing over
quietly(fallback to the __init__ passed args in other words).

Is There any other functions or methods that you would recommend be added to
the lib?

Any and all other suggestions are welcome. I love python and you guys are
practically helping me expand on my knowledge in this realm :)

I haven't touched it in a little bit so after I mess with it again I'll be
able to add more this thread/lib or whatever.

Thanks Again,
-Alex Goretoy
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From gagsl-py2 at yahoo.com.ar  Wed Mar 10 02:04:04 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 10 Mar 2010 04:04:04 -0300
Subject: Down casting Python objects
References: <7659cab31003091326i6f3ab6bta3b8f5948ab7b0ff@mail.gmail.com>
Message-ID: <op.u9ca82qzx6zn5v@lepton.softlabbsas.com.ar>

En Tue, 09 Mar 2010 18:26:52 -0300, Andrey Fedorov <anfedorov at gmail.com>  
escribi?:

> So I have `x', a instance of class `Foo'. I also have class `Bar', a  
> class
> extending `Foo' with a couple of methods. I'd like to "down cast" x as
> efficiently as possible. Is it OK to just set `x.__class__ = Bar' and  
> expect
> things to work OK in all major versions of CPython?

If the assignment x.__class__ = Bar succeeds, yes, that's enough. But you  
may not be able to reassign __class__ in some cases (e.g. Foo defines  
__slots__ but Bar doesn't, so you have a layout conflict).

Of course, you always have to make sure Bar invariants hold on this  
particular instance...

I must ask, why you didn't create a Bar instance in the first place?

-- 
Gabriel Genellina



From timr at probo.com  Wed Mar 10 02:08:48 2010
From: timr at probo.com (Tim Roberts)
Date: Tue, 09 Mar 2010 23:08:48 -0800
Subject: file seek is slow
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>
Message-ID: <iogep59cp5756f63cpqq9dk7m90hdjht6c@4ax.com>

Metalone <jcb at iteris.com> wrote:
>
>static void main(int argc, char *argv[])

As a side note, do you realize that this definition is invalid, in two
ways?  "main" cannot be declared "static".  The whole reason we use the
special name "main" is so that the startup code in the C run-time can link
to it.  If "main" is static, it won't be exposed in the object file, and
the linker couldn't find it.  It happens to work here because your C
compiler knows about "main" and discards the "static", but that's not a
good practice.

Further, it's not valid to have "main" return "void".  The standards
require that it be declared as returning "int".  Again, "void" happens to
work in VC++, but there are architectures where it does not.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From agoretoy at gmail.com  Wed Mar 10 02:14:45 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Wed, 10 Mar 2010 01:14:45 -0600
Subject: datelib pythonification
In-Reply-To: <c9d33c541003092258o820adf7i2ec916b5eb035051@mail.gmail.com>
References: <c9d33c541002201626o4cb51819ycea15bb24933d5d@mail.gmail.com> 
	<mailman.15.1266716296.4577.python-list@python.org>
	<b11a98b1-4e43-4d74-88d7-9b24cd0743ed@o16g2000prh.googlegroups.com>
	<c9d33c541003092258o820adf7i2ec916b5eb035051@mail.gmail.com>
Message-ID: <c9d33c541003092314v38e37365we64b3b936a3300ac@mail.gmail.com>

I have another quick question. What would be the best way to implement dates
length function?
or should i just leave that up to the user using the lib?
-Alex Goretoy
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From agoretoy at gmail.com  Wed Mar 10 02:23:31 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Wed, 10 Mar 2010 01:23:31 -0600
Subject: datelib pythonification
In-Reply-To: <c9d33c541003092314v38e37365we64b3b936a3300ac@mail.gmail.com>
References: <c9d33c541002201626o4cb51819ycea15bb24933d5d@mail.gmail.com> 
	<mailman.15.1266716296.4577.python-list@python.org>
	<b11a98b1-4e43-4d74-88d7-9b24cd0743ed@o16g2000prh.googlegroups.com>
	<c9d33c541003092258o820adf7i2ec916b5eb035051@mail.gmail.com> 
	<c9d33c541003092314v38e37365we64b3b936a3300ac@mail.gmail.com>
Message-ID: <c9d33c541003092323p7646676w35751916811cf095@mail.gmail.com>

>>> import datelib
>>> datelib.datelib().dates_list()
[datetime.date(2009, 3, 10), datetime.date(2009, 4, 10), datetime.date(2009,
5, 10), datetime.date(2009, 6, 10), datetime.date(2009, 7, 10),
datetime.date(2009, 8, 10), datetime.date(2009, 9, 10), datetime.date(2009,
10, 10), datetime.date(2009, 11, 10), datetime.date(2009, 12, 10),
datetime.date(2010, 1, 10), datetime.date(2010, 2, 10), datetime.date(2010,
3, 10)]
>>> len(datelib.datelib().dates_list())
13
>>>
I know i can do this and untested below:

function dates_len(*targs, **dargs)
    return len(self.dates_list(*targs, **dargs))

Is this bloating the lib with unnecessary functions/methods?

-Alex Goretoy
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From gagsl-py2 at yahoo.com.ar  Wed Mar 10 03:07:18 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 10 Mar 2010 05:07:18 -0300
Subject: pyserial script doesnt execute properly
References: <c083a958-7320-4fd3-82ae-cf4da7808af6@u15g2000prd.googlegroups.com>
	<4b9612bc$0$6059$426a74cc@news.free.fr>
	<bf3cbd2a-eb4c-455c-9b01-de44d6b35f60@v34g2000prm.googlegroups.com>
Message-ID: <op.u9cd6gd0x6zn5v@lepton.softlabbsas.com.ar>

En Tue, 09 Mar 2010 12:01:22 -0300, kishore <kishoreinme at gmail.com>
escribi?:
>>
>> > Iam using python 2.5.4
>> > pyserial  2.4
>> > pywin32-214
>> > on windows 7
>>
>> > i hav a small test script written to query a serial device (arduino)
>> > and get back reply appropriately
>>
>
> Thanks for your response
> i tried closing idle and the following code prints
> port opened
> Write failed
>
> code:
>
> import serial
> import time
> ser=serial.Serial(port='\\.\COM2', baudrate=9600)

If you want a string containing these 8 characters \\.\COM2 you have to
write it either as r'\\.\COM2' or '\\\\.\\COM2'

> if ser:
> 	print 'port opened'

Either the Serial object is constructed and returned, or an exception is
raised. 'if ser:' has no sense; Python is not C...

> ser.open()
> if ser.write('1'):
> 	print 'Write success'
> else:
> 	print 'write failed'

The write method, when successful, implicitly returns None. None has a
false boolean value, so your code will always print 'write failed'.

Usually, in Python, error conditions are marked by raising an exception.
Using return values to indicate success/failure is uncommon.

Also, are you sure the device doesn't expect a newline character? '1\n'?

You may need to call ser.flushOutput() to ensure the output buffer is
actually emptied.

> time.sleep(1)
> a=ser.readline()

print repr(a)

> time.sleep(1)
> b=ser.readline()

print repr(b)

> ser.close()

> I believe this might be a serial port access error.
> how to solve this?
> Any suggestions?

I don't think so. If you could not access the serial port, you'd have seen
an IOError exception or similar.

-- 
Gabriel Genellina



From kishoreinme at gmail.com  Wed Mar 10 03:39:36 2010
From: kishoreinme at gmail.com (kishore)
Date: Wed, 10 Mar 2010 00:39:36 -0800 (PST)
Subject: pyserial script doesnt execute properly
References: <c083a958-7320-4fd3-82ae-cf4da7808af6@u15g2000prd.googlegroups.com>
	<4b9612bc$0$6059$426a74cc@news.free.fr>
	<bf3cbd2a-eb4c-455c-9b01-de44d6b35f60@v34g2000prm.googlegroups.com>
	<mailman.535.1268208452.23598.python-list@python.org>
Message-ID: <85262eff-ac2d-4fe1-bca3-2840c13ef06d@b36g2000pri.googlegroups.com>

On Mar 10, 1:07?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Tue, 09 Mar 2010 12:01:22 -0300, kishore <kishorei... at gmail.com>
> escribi?:
>
>
>
>
>
> >> > Iam using python 2.5.4
> >> > pyserial ?2.4
> >> > pywin32-214
> >> > on windows 7
>
> >> > i hav a small test script written to query a serial device (arduino)
> >> > and get back reply appropriately
>
> > Thanks for your response
> > i tried closing idle and the following code prints
> > port opened
> > Write failed
>
> > code:
>
> > import serial
> > import time
> > ser=serial.Serial(port='\\.\COM2', baudrate=9600)
>
> If you want a string containing these 8 characters \\.\COM2 you have to
> write it either as r'\\.\COM2' or '\\\\.\\COM2'
>
> > if ser:
> > ? ?print 'port opened'
>
> Either the Serial object is constructed and returned, or an exception is
> raised. 'if ser:' has no sense; Python is not C...
>
> > ser.open()
> > if ser.write('1'):
> > ? ?print 'Write success'
> > else:
> > ? ?print 'write failed'
>
> The write method, when successful, implicitly returns None. None has a
> false boolean value, so your code will always print 'write failed'.
>
> Usually, in Python, error conditions are marked by raising an exception.
> Using return values to indicate success/failure is uncommon.
>
> Also, are you sure the device doesn't expect a newline character? '1\n'?
>
> You may need to call ser.flushOutput() to ensure the output buffer is
> actually emptied.
>
> > time.sleep(1)
> > a=ser.readline()
>
> print repr(a)
>
> > time.sleep(1)
> > b=ser.readline()
>
> print repr(b)
>
> > ser.close()
> > I believe this might be a serial port access error.
> > how to solve this?
> > Any suggestions?
>
> I don't think so. If you could not access the serial port, you'd have seen
> an IOError exception or similar.
>
> --
> Gabriel Genellina

thanks Gabriel & Andy..ll get back soon here after trying ur
suggestions


From jeherul at gmail.com  Wed Mar 10 04:06:28 2010
From: jeherul at gmail.com (JEHERUL)
Date: Wed, 10 Mar 2010 14:36:28 +0530
Subject: about Telnetlib problem
Message-ID: <46c1bcc21003100106s1db37a95ke928306c5e79d088@mail.gmail.com>

Dear All

I am trying to telnet to a Cisco router . Following is my code .

#code router.py

import getpass
import sys
import telnetlib

HOST = "router address"               # router address is ommitted for
security reason
user = raw_input("Username : ")
password = getpass.getpass()

tn = telnetlib.Telnet(HOST)

tn.read_until("Username: ")
tn.write(user + "\n")
tn.read_until("Password: ")
tn.write(password + "\n")


tn.read_until("I>")
tn.write("sh int f0/0")

print "Just to check"


print tn.read_all()

print "after read"
tn.write("exit\n")



But when I execute the program I got the following error .


Traceback (most recent call last):
  File "router.py", line 23, in ?
    print tn.read_all()
  File "/usr/lib/python2.4/telnetlib.py", line 330, in read_all
    self.fill_rawq()
  File "/usr/lib/python2.4/telnetlib.py", line 521, in fill_rawq
    buf = self.sock.recv(50)

Please help me .

Regards
-- 
Jeherul Islam
Indian Institute of Information Technology and Management .
Gwalior (MP)
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From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 10 04:16:27 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Mar 2010 09:16:27 GMT
Subject: odd error
References: <bc7f680c1003090555o4d09c7b1l40bb21967d767885@mail.gmail.com>
	<4B96787B.3030907@timgolden.me.uk>
	<mailman.499.1268153292.23598.python-list@python.org>
Message-ID: <pan.2010.03.10.09.16.27@REMOVE.THIS.cybersource.com.au>

On Tue, 09 Mar 2010 11:48:10 -0500, Alex Hall wrote:

> Okay, I changed the keycode from 99 (c) to 107 (k), and the errors have
> disappeared. However, now the function that should be called is not. As
> I said in a previous message, I have always had trouble with this sort
> of keystroke dictionary. It seems like, if a keycode is out of order or
> not one more than the number before it, the function to which it is tied
> will not get called.

Dictionaries aren't ordered, that can't be the problem.


> keys.append({
>   1 : (48, win32con.MOD_CONTROL),
>   2 : (49, win32con.MOD_CONTROL), [...]

Dicts don't have an append message. Why are you building a list and 
adding a dictionary to it?

The question is, how many such dicts are in the list, and which one are 
you searching for the function? Is it possible that the problem is that 
you have multiple dicts in the keys list, and then perform your look-ups 
on the wrong one?



Likewise for your list of functions:

> funcs.append({
>   1 : exitProgram,
>   2 : arm.sayLoad1, [...]

Perhaps all you need is a single dict, mapping characters to functions:

funcs = {  # Just a dict
    # keycode: function
    'q': exitProgram,
    'a': arm.sayLoad1
    # etc.
    }


Then whenever you get a keyboard event, convert it to the character:

keycode = 113
c = chr(keycode)
funcs(c)()




-- 
Steven


From mail at timgolden.me.uk  Wed Mar 10 04:25:53 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 10 Mar 2010 09:25:53 +0000
Subject: odd error
In-Reply-To: <pan.2010.03.10.09.16.27@REMOVE.THIS.cybersource.com.au>
References: <bc7f680c1003090555o4d09c7b1l40bb21967d767885@mail.gmail.com>	<4B96787B.3030907@timgolden.me.uk>	<mailman.499.1268153292.23598.python-list@python.org>
	<pan.2010.03.10.09.16.27@REMOVE.THIS.cybersource.com.au>
Message-ID: <4B9765A1.1030509@timgolden.me.uk>

On 10/03/2010 09:16, Steven D'Aprano wrote:
> Perhaps all you need is a single dict, mapping characters to functions:
>
> funcs = {  # Just a dict
>      # keycode: function
>      'q': exitProgram,
>      'a': arm.sayLoad1
>      # etc.
>      }
>
>
> Then whenever you get a keyboard event, convert it to the character:
>
> keycode = 113
> c = chr(keycode)
> funcs(c)()

FWIW (altho' it's not clear from the OP's code) he's basically
doing this:

http://timgolden.me.uk/python/win32_how_do_i/catch_system_wide_hotkeys.html

which uses the dictionary keys as an id in the call to RegisterHotKey.

Obviously, that doesn't explain why he's building lists of dictionaries.


TJG


From robin.rytich at gmail.com  Wed Mar 10 04:32:05 2010
From: robin.rytich at gmail.com (Robin Rytich)
Date: Wed, 10 Mar 2010 12:32:05 +0300
Subject: Knight's tour Warndorff's algorithm problem
In-Reply-To: <op.u9b68cuyx6zn5v@lepton.softlabbsas.com.ar>
References: <op.u9b68cuyx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <1268213525.12869.188.camel@rytich-laptop>

On Wed, 2010-03-10 at 02:37 -0300, Gabriel Genellina wrote:

> Warnsdorff's algorithm is heuristic; it works most of the time, but in  
> some cases leads to a dead end and you have to backtrack and try another  
> alternative.
> The starting square is important; if you start at 1,1 (instead of 0,0)  
> your program finds a solution for all those problematic board sizes.

Wow, didn't know about that. It seems to be a good idea for me to make a
little research around this question.

> Some comments on the code itself:

> This sets a class attribute (as opposed to normal, instance attributes)  
> which is shared by all ChessBoard instances (this really should be covered  
> in the FAQ!). 

Damn, I'm ashamed.

About other points, I actually totally agree with you (and corrected
almost everything before received your letter). Thank you for your
remarks, I'll review public code more careful next time.

Robin Rytich



From mehgcap at gmail.com  Wed Mar 10 07:09:13 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Wed, 10 Mar 2010 07:09:13 -0500
Subject: odd error
In-Reply-To: <4B9765A1.1030509@timgolden.me.uk>
References: <bc7f680c1003090555o4d09c7b1l40bb21967d767885@mail.gmail.com>
	<4B96787B.3030907@timgolden.me.uk>
	<mailman.499.1268153292.23598.python-list@python.org>
	<pan.2010.03.10.09.16.27@REMOVE.THIS.cybersource.com.au>
	<4B9765A1.1030509@timgolden.me.uk>
Message-ID: <bc7f680c1003100409n751f2911rbc1d43e3fd386919@mail.gmail.com>

I am honestly a bit lost as to why keys.append() is not a good choice
here, but I have it working. I apparently have to use the ascii for
capital letters if I am capturing the shift modifier, not the
lowercase ascii. Using 67 instead of 99 works as expected.

I use append because the program has three different modes.
Eventually, each mode may have its own keystrokes. When the user
switches modes, the previous mode's keystrokes are unregistered and
the new keystrokes, keys[currentModeNumber], are registered. The same
with the functions; when a function is called from the dictionary, it
is called using funcs[currentModeNumber]. Again, this lets me put all
my functions into one big list, where each member of the list is a
dictionary. I probably have the terminology wrong, but hopefully that
makes sense. Sorry for not explaining that earlier, but I was just
looking for problems in the key codes. Thanks for your help!

On 3/10/10, Tim Golden <mail at timgolden.me.uk> wrote:
> On 10/03/2010 09:16, Steven D'Aprano wrote:
>> Perhaps all you need is a single dict, mapping characters to functions:
>>
>> funcs = {  # Just a dict
>>      # keycode: function
>>      'q': exitProgram,
>>      'a': arm.sayLoad1
>>      # etc.
>>      }
>>
>>
>> Then whenever you get a keyboard event, convert it to the character:
>>
>> keycode = 113
>> c = chr(keycode)
>> funcs(c)()
>
> FWIW (altho' it's not clear from the OP's code) he's basically
> doing this:
>
> http://timgolden.me.uk/python/win32_how_do_i/catch_system_wide_hotkeys.html
>
> which uses the dictionary keys as an id in the call to RegisterHotKey.
>
> Obviously, that doesn't explain why he's building lists of dictionaries.
>
>
> TJG
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From mail at timgolden.me.uk  Wed Mar 10 07:15:06 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 10 Mar 2010 12:15:06 +0000
Subject: odd error
In-Reply-To: <bc7f680c1003100409n751f2911rbc1d43e3fd386919@mail.gmail.com>
References: <bc7f680c1003090555o4d09c7b1l40bb21967d767885@mail.gmail.com>	
	<4B96787B.3030907@timgolden.me.uk>	
	<mailman.499.1268153292.23598.python-list@python.org>	
	<pan.2010.03.10.09.16.27@REMOVE.THIS.cybersource.com.au>	
	<4B9765A1.1030509@timgolden.me.uk>
	<bc7f680c1003100409n751f2911rbc1d43e3fd386919@mail.gmail.com>
Message-ID: <4B978D4A.5060204@timgolden.me.uk>

On 10/03/2010 12:09, Alex Hall wrote:
> I am honestly a bit lost as to why keys.append() is not a good choice
> here, but I have it working.

That's ok; it's just not clear from the context why you have a list
of dicts but your comment about different modes explains that.

> I apparently have to use the ascii for
> capital letters if I am capturing the shift modifier, not the
> lowercase ascii. Using 67 instead of 99 works as expected.

That's probably because the os is "preprocessing" the keystroke so
that shift-a returns "A" and not "a". You might find that you don't
even *need* the shift modifier in those circs.

If I get the time this pm, I'll try to put together some example
code which runs to more than 10 items in a dict just in case there
is some bizarre cornercase which is causing a problem but I honestly
doubt it.

TJG


From paskari007 at yahoo.ca  Wed Mar 10 07:19:29 2010
From: paskari007 at yahoo.ca (PEYMAN ASKARI)
Date: Wed, 10 Mar 2010 04:19:29 -0800 (PST)
Subject: Importing Modules
Message-ID: <676034.43316.qm@web30001.mail.mud.yahoo.com>

Hello

I frequent the PyGtk mailing list all the time, but this is the first time I am posting here =)

I wanted to know if imported classes are treated differently than internal classes.

I have attached a minimal example which points out what I mean. Essentially, if I create a class:

class A():
?__init__(self):
? pass

and call A, or A() I get something to the effect of? <__main__.A instance at 0xb7f088ac>

but if I call from module_name import A and then call A or A() I get something to the effect of? <module_4.module_4 instance at 0xb7f0882c>

I was wondering if this would be a problem.

I have included the test_import.py file as well as 4 module files which it loads. Save the tes_import.py file to a folder, create another folder there, and save ONLY the 4 modules files to that new folder. In the code, update line 26 to reflect to path of the newly created directory

Thanks in advanced


Peyman

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From jeanmichel at sequans.com  Wed Mar 10 07:27:33 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Wed, 10 Mar 2010 13:27:33 +0100
Subject: Import problem
In-Reply-To: <4b957866$0$17135$426a34cc@news.free.fr>
References: <6630f859-b85d-4841-b1d5-2a563dca9cbb@q15g2000yqj.googlegroups.com>	<mailman.460.1268053858.23598.python-list@python.org>
	<4b957866$0$17135$426a34cc@news.free.fr>
Message-ID: <4B979035.60505@sequans.com>

News123 wrote:
> Jean-Michel Pichavant wrote:
>   
>> Johny wrote:
>>     
>>> I have this directory structure
>>>
>>> C:
>>>       \A
>>>          __init__.py
>>>          amodule.py
>>>
>>>          \B
>>>           __init__.py
>>>           bmodule.py
>>>
>>>            \D
>>>             __init__.py
>>>             dmodule.py
>>>
>>> and  I want to import  bmodule.py
>>> C:\>cd \
>>>
>>> C:\>python
>>> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
>>> (Intel)] on win
>>> 32
>>> Type "help", "copyright", "credits" or "license" for more information.
>>>  
>>>       
>>>>>> from A.B import  bmodule
>>>>>>         
>>>>>>             
>>> I am bmodule
>>>   C:\>
>>>
>>> so far so good. Now I would like to import bmodule but if the current
>>> directory is \D subdirectory.
>>>
>>> C:> cd \A\B\D
>>> C:\A\B\D>
>>> C:\A\B\D>python
>>> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
>>> (Intel)] on win
>>> 32
>>> Type "help", "copyright", "credits" or "license" for more information.
>>>  
>>>       
>>>>>> import sys
>>>>>> sys.path.append('C:\\A')
>>>>>> from A.B import bmodule
>>>>>>         
>>>>>>             
>>> Traceback (most recent call last):
>>>   File "<stdin>", line 1, in <module>
>>> ImportError: No module named A.B
>>>
>>> C:\>
>>>
>>> so I can not import a module from the parent directory? Or where did I
>>> make an error?
>>> Thanks for help
>>>
>>> L.
>>>   
>>>       
>> try
>>
>> import sys
>> sys.path.append('C:\\')
>> from A.B import bmodule
>>
>>     
> is there any 'automatic' way of finding the top level
> directory?basically the 'top level directory is the first directory
> going upwards, that doesn't contain a __init__.py file.
>   
what if some user has an __init__.py file the top level directory of 
your package ?
> of course you could do this 'manually' by
> doing:
>
> # assume, that this module is A.amodule
> import sys
> import os
>
> # I'd love to have a similiar automatic construct
> if __name__ == "__main__":
>     level = 1 # or function locating how far to go up before
>               # finding a dir, whcih does not contain a __init__.py
>     mydir = os.path.split(__file__)[0]
>     topdir = os.path.join( mydir,*(("..",)*level))
>     abstop = os.path.abspath(topdir)
>     sys.path.append(abstop)
>
> ## now you can import with the normal module paths
>
> import A.blo
> print "and I found blo",dir(A.blo)
>
>
> bye N
>
>
>
>   
You don't want to do that and you don't need it neither. That's what the 
env variable PYTHONPATH is for. set it correctly, install your package 
inside and everything works just fine (+standard). With a linux OS it 
easy to create smb links to point to any working directory. It should be 
possible on windows as well.

If your package is meant to be destributed, you may use setup.py

JM


From victorsubervi at gmail.com  Wed Mar 10 07:32:15 2010
From: victorsubervi at gmail.com (Victor Subervi)
Date: Wed, 10 Mar 2010 08:32:15 -0400
Subject: Interacting With Another Script
Message-ID: <4dc0cfea1003100432h2495ede1vf5e5bd75172ab5ea@mail.gmail.com>

Hi;
There's a program (vpopmail) that has commands which, when called, request
input ("email address", "password", etc.) from the command line. I would
like to build a TTW interface for my clients to use that interacts with
these commands. It's easy enough for me to get the information from a
script, but how do I input it when these functions keep requesting
information? I hope I've made myself clear :-}
TIA,
beno
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From ndbecker2 at gmail.com  Wed Mar 10 08:12:14 2010
From: ndbecker2 at gmail.com (Neal Becker)
Date: Wed, 10 Mar 2010 08:12:14 -0500
Subject: Can't define __call__ within __init__?
Message-ID: <hn85re$vj9$1@dough.gmane.org>

Want to switch __call__ behavior.  Why doesn't this work?  What is the 
correct way to write this?

class X (object):
    def __init__(self, i):
        if i == 0:
            def __call__ (self):
                return 0
        else:
            def __call_ (self):
                return 1


x = X(0)

x()
TypeError: 'X' object is not callable




From jeanmichel at sequans.com  Wed Mar 10 08:22:36 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Wed, 10 Mar 2010 14:22:36 +0100
Subject: Named loops for breaking
In-Reply-To: <6d6a35e8-f09c-4792-8abe-5a0dc24d214e@g28g2000yqh.googlegroups.com>
References: <6d6a35e8-f09c-4792-8abe-5a0dc24d214e@g28g2000yqh.googlegroups.com>
Message-ID: <4B979D1C.6090706@sequans.com>

Daniel Klein wrote:
> Hey,
>
> I did a little searching and couldn't really find much recent on this.
> The only thing I found was this:
>
> http://groups.google.com/group/comp.lang.python/browse_thread/thread/a696624c92b91181/5b7479fdc3362b83?lnk=gst&q=break+named+loop#5b7479fdc3362b83
>
> Basically I'm wondering if there are any plans to implemented named
> loops in Python, so I can tell a break command to break out of a
> specific loop in the case of nested loops. Currently I'm using boolean
> flag variables, but I find that very clumsy. I know this idea of
> breaking out of specific loops from javascript; I guess java does it
> too. It just seems a very Pythonian idea to me: clear, promotes code
> legibility, seems obvious.
>   
Strange that I've rarely been in need of such feature. Continues & 
breaks are mess-prone, adding an 'outter block' break feature would just 
increase the messing potential of such controls.
Just my opinion though.

Still there's a control that is able to break outter scopes : return.
So embed your loop in a function and you'll be able to break whenever 
you want.

JM


From simon at brunningonline.net  Wed Mar 10 08:27:31 2010
From: simon at brunningonline.net (Simon Brunning)
Date: Wed, 10 Mar 2010 13:27:31 +0000
Subject: Can't define __call__ within __init__?
In-Reply-To: <hn85re$vj9$1@dough.gmane.org>
References: <hn85re$vj9$1@dough.gmane.org>
Message-ID: <8c7f10c61003100527o7c7f9375ie662ce67ab78f1de@mail.gmail.com>

On 10 March 2010 13:12, Neal Becker <ndbecker2 at gmail.com> wrote:
> Want to switch __call__ behavior. ?Why doesn't this work? ?What is the
> correct way to write this?
>
> class X (object):
> ? ?def __init__(self, i):
> ? ? ? ?if i == 0:
> ? ? ? ? ? ?def __call__ (self):
> ? ? ? ? ? ? ? ?return 0
> ? ? ? ?else:
> ? ? ? ? ? ?def __call_ (self):
> ? ? ? ? ? ? ? ?return 1
>
>
> x = X(0)
>
> x()
> TypeError: 'X' object is not callable

__call__ is in the __init__ method's local namespace - you need to
bind it to the class's namespace instead:

        X.__call__ = __call__

But this probably isn't what you want either, since all instances of X
will share the same method.

What are you trying to do? In your simple example, you'd be much
better off with a single __call__ method. But you knew that.

-- 
Cheers,
Simon B.


From anfedorov at gmail.com  Wed Mar 10 08:31:14 2010
From: anfedorov at gmail.com (Andrey Fedorov)
Date: Wed, 10 Mar 2010 08:31:14 -0500
Subject: Down casting Python objects
In-Reply-To: <41B1429F-57E8-4F58-883E-03F20FA9A635@gmail.com>
References: <7659cab31003091326i6f3ab6bta3b8f5948ab7b0ff@mail.gmail.com> 
	<41B1429F-57E8-4F58-883E-03F20FA9A635@gmail.com>
Message-ID: <7659cab31003100531i51749f7er6f23ca0ef59cdddf@mail.gmail.com>

On Wed, Mar 10, 2010 at 12:24 AM, Rami Chowdhury <rami.chowdhury at gmail.com>
wrote:

> Could you tell us *why* you need to down-cast x? Explicit type-casting is
> usually unnecessary in Python...


Sure! It's related to the longer question I unwisely asked during PyCon [1]
(when no one had time to read it, I suppose).

I have a couple of different flavors of request objects which I'd like to
make conform to a single interface. So Request `x' come in, I determine
which kind of request I'm dealing with, and would like to "down-cast" it to
ARequest or BRequest, classes which will provide appropriate accessor
properties for the rest of the code to use.

An option clearly in line with Python's docs might be for `x' to be an
attribute of an ARequest instance, but that would complicate the code of
ARequest. What I'm looking for is a way of adding mix-in's at runtime, if
that makes sense.

Cheers,
Andrey

1. http://mail.python.org/pipermail/python-list/2010-February/1236681.html
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From breamoreboy at yahoo.co.uk  Wed Mar 10 08:40:19 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Wed, 10 Mar 2010 13:40:19 +0000
Subject: Can't define __call__ within __init__?
In-Reply-To: <hn85re$vj9$1@dough.gmane.org>
References: <hn85re$vj9$1@dough.gmane.org>
Message-ID: <hn87eh$6kh$1@dough.gmane.org>

Neal Becker wrote:
> Want to switch __call__ behavior.  Why doesn't this work?  What is the 
> correct way to write this?
> 
> class X (object):
>     def __init__(self, i):
>         if i == 0:
>             def __call__ (self):
>                 return 0
>         else:
>             def __call_ (self):
>                 return 1
> 
> 
> x = X(0)
> 
> x()
> TypeError: 'X' object is not callable
> 
> 
I think it's because X has already been constructed when __init__ is 
called, so __new__ is the place for your conditional code.



From ndbecker2 at gmail.com  Wed Mar 10 08:41:28 2010
From: ndbecker2 at gmail.com (Neal Becker)
Date: Wed, 10 Mar 2010 08:41:28 -0500
Subject: Can't define __call__ within __init__?
References: <hn85re$vj9$1@dough.gmane.org>
	<8c7f10c61003100527o7c7f9375ie662ce67ab78f1de@mail.gmail.com>
Message-ID: <hn87i9$6d3$1@dough.gmane.org>

Simon Brunning wrote:

> On 10 March 2010 13:12, Neal Becker <ndbecker2 at gmail.com> wrote:
>> Want to switch __call__ behavior.  Why doesn't this work?  What is the
>> correct way to write this?
>>
>> class X (object):
>> def __init__(self, i):
>> if i == 0:
>> def __call__ (self):
>> return 0
>> else:
>> def __call_ (self):
>> return 1
>>
>>
>> x = X(0)
>>
>> x()
>> TypeError: 'X' object is not callable
> 
> __call__ is in the __init__ method's local namespace - you need to
> bind it to the class's namespace instead:
> 
>         X.__call__ = __call__
> 
> But this probably isn't what you want either, since all instances of X
> will share the same method.
> 
> What are you trying to do? In your simple example, you'd be much
> better off with a single __call__ method. But you knew that.
> 

Sorry, a bit early in the morning.  This works:
class X (object):
    def __init__(self, i):
        if i == 0:
            def F (self):
                return 0
        else:
            def F (self):
                return 1
        self.F = F
        
    def __call__ (self):
        return self.F (self)
   

Not sure if there is a more elegant (or compact) way to write this.
Could __call__ be defined directly within __init__?

What I'm trying to do is make a callable whose behavior is switched based on 
some criteria that will be fixed for all calls.  In my example, this will 
ultimately be determined by the setting of a command line switch.



From martin.hellwig at dcuktec.org  Wed Mar 10 08:54:27 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Wed, 10 Mar 2010 13:54:27 +0000
Subject: Does this already exists?: A module that checks if the used platform
	is supported
Message-ID: <hn88ag$b5m$1@news.eternal-september.org>

Hi all,

Before I start reinventing a squared wheel, I have the following question:
Is there already a (standard) module that wraps around the various 
os/sys information which checks if the platform + version is supported 
for what I want to do with it.

For example I am currently looking at making a wrapper around sysctl, 
for Freebsd only (2.2 onwards perhaps later I add Linux if I feel up to it.

So yes of course I can do a os.uname() but it struck me that there must 
be a better way. *

If you think I made a thought error along the line and there is a better 
solution, please do tell me too :-)

Thanks,

-- 
mph

* Something like:
test = RequirePlatform(do_not_raise=True)
test.require(platform='freebsd', version_min='2.2')
# If the platform is anything else but FreeBSD 2.2+
# raise an EnvironmentError. Otherwise, store the
# result of the test (True/False).
# Result of the require (and any additional tests
# can be accessed using the index operators

if test[0]:
     print('supported')


From mnordhoff at mattnordhoff.com  Wed Mar 10 08:58:07 2010
From: mnordhoff at mattnordhoff.com (Matt Nordhoff)
Date: Wed, 10 Mar 2010 13:58:07 +0000
Subject: Can't define __call__ within __init__?
In-Reply-To: <hn87i9$6d3$1@dough.gmane.org>
References: <hn85re$vj9$1@dough.gmane.org>	<8c7f10c61003100527o7c7f9375ie662ce67ab78f1de@mail.gmail.com>
	<hn87i9$6d3$1@dough.gmane.org>
Message-ID: <4B97A56F.5060903@mattnordhoff.com>

Neal Becker wrote:
> Simon Brunning wrote:
> 
>> On 10 March 2010 13:12, Neal Becker <ndbecker2 at gmail.com> wrote:
>>> Want to switch __call__ behavior.  Why doesn't this work?  What is the
>>> correct way to write this?
>>>
>>> class X (object):
>>> def __init__(self, i):
>>> if i == 0:
>>> def __call__ (self):
>>> return 0
>>> else:
>>> def __call_ (self):
>>> return 1
>>>
>>>
>>> x = X(0)
>>>
>>> x()
>>> TypeError: 'X' object is not callable
>> __call__ is in the __init__ method's local namespace - you need to
>> bind it to the class's namespace instead:
>>
>>         X.__call__ = __call__
>>
>> But this probably isn't what you want either, since all instances of X
>> will share the same method.
>>
>> What are you trying to do? In your simple example, you'd be much
>> better off with a single __call__ method. But you knew that.
>>
> 
> Sorry, a bit early in the morning.  This works:
> class X (object):
>     def __init__(self, i):
>         if i == 0:
>             def F (self):
>                 return 0
>         else:
>             def F (self):
>                 return 1
>         self.F = F
>         
>     def __call__ (self):
>         return self.F (self)
>    
> 
> Not sure if there is a more elegant (or compact) way to write this.
> Could __call__ be defined directly within __init__?
> 
> What I'm trying to do is make a callable whose behavior is switched based on 
> some criteria that will be fixed for all calls.  In my example, this will 
> ultimately be determined by the setting of a command line switch.

ISTM it would be prettiest to do:

class X(object):
    def __init__(self, i):
        self.flag = i == 0
    def __call__(self):
        if self.flag:
            return 0
        else:
            return 1

Or, if the comparison isn't particularly expensive, it would look nicer
to just use self.i and do "self.i == 0" in __call__.

Not that it matters, but this is probably faster than your version, too,
since it saves a method call.

By the way, IIRC Python only looks up double-underscore methods on the
class, not the instance. That's why you had to indirect through self.F.
-- 
Matt Nordhoff


From jeanmichel at sequans.com  Wed Mar 10 09:07:57 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Wed, 10 Mar 2010 15:07:57 +0100
Subject: pexpect and logging integration
In-Reply-To: <4B972EA7.50807@telcotec.se>
References: <4B972EA7.50807@telcotec.se>
Message-ID: <4B97A7BD.6050003@sequans.com>

Lars Stavholm wrote:
> Hi all,
>
> has anyone managed to integrate pexpect and logging?
>
> I.e., I'd like to be able to pick up the dialog,
> commands sent and responses received, in my logging.
> I know about the pexpect logfile, and I can log things
> to stdout or stderr, but I really need to log using the
> python logging library.
>
> Any thoughts appreciated
> /Lars
>
>   
I had to implement this.
It's a bit of a hack, but it does the job.

The following code is tested with python 2.5, I remember pexpect behaves 
slightly differently in python 2.3.

import logging
import pexpect
import re

# this will be the method called by the pexpect object to log
def _write(*args, **kwargs):
    content = args[0]
    # let's ignore other params, pexpect only use one arg AFAIK
    if content in [' ', '', '\n', '\r', '\r\n']:
        return # don't log empty lines
    for eol in ['\r\n', '\r', '\n']:
        # remove ending EOL, the logger will add it anyway
        content = re.sub('\%s$' % eol, '', content)
    return logger.info(content) # call the logger info method with the 
reworked content


# our flush method
def _doNothing():
    pass

# get the logger
logger = logging.getLogger('foo')

# configure the logger
logger.handlers=[]
logger.addHandler(logging.StreamHandler())
logger.handlers[-1].setFormatter(logging.Formatter("%(asctime)s - 
%(name)s - %(levelname)s - %(message)s"))
logger.setLevel(logging.INFO)

# give the logger the methods required by pexpect
logger.write = _write
logger.flush = _doNothing

p = pexpect.spawn('echo "hello world !!"', logfile=logger)
p.expect('!!')

... 2010-03-10 15:01:31,234 - foo - INFO - hello world !!

Hope it helps.

JM



From jeanmichel at sequans.com  Wed Mar 10 09:10:10 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Wed, 10 Mar 2010 15:10:10 +0100
Subject: about Telnetlib problem
In-Reply-To: <46c1bcc21003100106s1db37a95ke928306c5e79d088@mail.gmail.com>
References: <46c1bcc21003100106s1db37a95ke928306c5e79d088@mail.gmail.com>
Message-ID: <4B97A842.4030709@sequans.com>

JEHERUL wrote:
> Dear All
>
> I am trying to telnet to a Cisco router . Following is my code .
>
> #code router.py
>
> import getpass
> import sys
> import telnetlib
>
> HOST = "router address"               # router address is ommitted for 
> security reason
> user = raw_input("Username : ")
> password = getpass.getpass()
>
> tn = telnetlib.Telnet(HOST)
>
> tn.read_until("Username: ")
> tn.write(user + "\n")
> tn.read_until("Password: ")
> tn.write(password + "\n")
>
>
> tn.read_until("I>")
> tn.write("sh int f0/0")
>
> print "Just to check"
>
>
> print tn.read_all()
>
> print "after read"
> tn.write("exit\n")
>
>
>
> But when I execute the program I got the following error .
>
>
> Traceback (most recent call last):
>   File "router.py", line 23, in ?
>     print tn.read_all()
>   File "/usr/lib/python2.4/telnetlib.py", line 330, in read_all
>     self.fill_rawq()
>   File "/usr/lib/python2.4/telnetlib.py", line 521, in fill_rawq
>     buf = self.sock.recv(50)
>
> Please help me .
>
> Regards
> -- 
> Jeherul Islam
> Indian Institute of Information Technology and Management .
> Gwalior (MP)
>
>
Hi,

Your error trace is incomplete it's missing the exception. It would be 
better if you provide it.

JM


From tjreedy at udel.edu  Wed Mar 10 09:21:12 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 10 Mar 2010 09:21:12 -0500
Subject: Knight's tour Warndorff's algorithm problem
In-Reply-To: <op.u9b68cuyx6zn5v@lepton.softlabbsas.com.ar>
References: <op.u9b68cuyx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <hn89sp$g5s$1@dough.gmane.org>

On 3/10/2010 12:37 AM, Gabriel Genellina wrote:

>> if (next != 0):
>> (self.y, self.x) = (next.y, next.x)

In Python3, next is a builtin function.
Choose a different name, at least in public code ;=).



From richardbp at gmail.com  Wed Mar 10 09:29:03 2010
From: richardbp at gmail.com (Richard)
Date: Wed, 10 Mar 2010 06:29:03 -0800 (PST)
Subject: os.rename [Errno 31] Too many links
Message-ID: <253f4908-1cb9-4165-bf01-1d89b39d3b35@k6g2000prg.googlegroups.com>

I want to atomically write to a file so have been using temporary
files and renaming:

temp = tempfile.NamedTemporaryFile(delete=False)
temp.file.write(data)
temp.file.close()
os.rename(temp.name, output_file)

This worked but after 39567 files os.rename raises an OSError: [Errno
31] Too many links

I can still create files in this directory so I doubt it is a platform
limitation.
Can you tell what is wrong? Am I not freeing the temporary file
resources properly?

thanks,
Richard




From tjreedy at udel.edu  Wed Mar 10 09:32:03 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 10 Mar 2010 09:32:03 -0500
Subject: Importing Modules
In-Reply-To: <676034.43316.qm@web30001.mail.mud.yahoo.com>
References: <676034.43316.qm@web30001.mail.mud.yahoo.com>
Message-ID: <hn8ah4$jbn$1@dough.gmane.org>

On 3/10/2010 7:19 AM, PEYMAN ASKARI wrote:
> Hello
>
> I frequent the PyGtk mailing list all the time, but this is the first
> time I am posting here =)
>
> I wanted to know if imported classes are treated differently than
> internal classes.
>
> I have attached a minimal example which points out what I mean.
> Essentially, if I create a class:
>
> class A():
> __init__(self):
> pass
>
> and call A, or A() I get something to the effect of <__main__.A instance
> at 0xb7f088ac>
>
> but if I call from module_name import A and then call A or A() I get
> something to the effect of <module_4.module_4 instance at 0xb7f0882c>
>
> I was wondering if this would be a problem.

Only if you code cares about A.__module__ (3.x, not sure of 2.x) and the 
string returned by str or repr, which nearly always, it should not.

tjr



From jjposner at optimum.net  Wed Mar 10 09:45:38 2010
From: jjposner at optimum.net (John Posner)
Date: Wed, 10 Mar 2010 09:45:38 -0500
Subject: Method / Functions - What are the differences?
In-Reply-To: <4b911ee0$0$4988$607ed4bc@cv.net>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
	<mailman.109.1267539415.23598.python-list@python.org>
	<hmk1mn$70u$1@newsreader3.netcologne.de>
	<4b8e4041$0$17447$426a34cc@news.free.fr> <hmlte9$d0f$1@dough.gmane.org>
	<mailman.205.1267633968.23598.python-list@python.org>
	<4b8e9660$0$21812$426a34cc@news.free.fr>
	<hmmrh4$644$1@newsreader3.netcologne.de> <4B8EF717.3070701@optimum.net>
	<4b902338$0$31260$607ed4bc@cv.net>
	<4b90f5eb$0$9148$426a74cc@news.free.fr>
	<4b911ee0$0$4988$607ed4bc@cv.net>
Message-ID: <4B97B092.4060901@optimum.net>

[ cross-posting to edu-sig ]

Bruno (and anyone else interested) --

As I promised/threatened, here's the *start* of a write-up on 
properties, aimed at non-advanced Python programmers:

   http://www.jjposner.net/media/python-properties-0310.pdf

I'm interested in corrections, of course. But I'm also interested in 
opinions as to whether this somewhat lengthy treatment is worth the 
effort -- does it improve on existing write-ups?

Tx,
John



From bringa at gmail.com  Wed Mar 10 10:15:47 2010
From: bringa at gmail.com (Daniel Klein)
Date: Wed, 10 Mar 2010 07:15:47 -0800 (PST)
Subject: Named loops for breaking
References: <6d6a35e8-f09c-4792-8abe-5a0dc24d214e@g28g2000yqh.googlegroups.com>
	<mailman.545.1268227366.23598.python-list@python.org>
Message-ID: <43248058-f388-4127-904a-e0c2e80a36e4@33g2000yqj.googlegroups.com>

Thanks for the link to the PEP. I should search through PEPs first
next time :)

Okay, I understand Guido's reasoning and yield the point. I typed up
the specific example in which I came across this problem and, while
doing so, realized there's a much better way of approaching the
problem, so thank you for that as well :)


From jpeck at fedex.com  Wed Mar 10 10:17:12 2010
From: jpeck at fedex.com (Jeff Peck)
Date: Wed, 10 Mar 2010 09:17:12 -0600
Subject: Bluetooth
In-Reply-To: <BD5B58B2-7774-4F42-90BC-5D0AF8CC82F7@rgbaz.eu>
References: <BD5B58B2-7774-4F42-90BC-5D0AF8CC82F7@rgbaz.eu>
Message-ID: <4B97B7F8.2030303@fedex.com>

On 3/7/2010 1:26 PM, PythonAB wrote:
> Hello,
>
>
> I'm writing a script that has to connect a bluetooth device
> with a 3D application.
> On my search for a bluetooth module i ran into this:
> http://www.python.org/download/releases/2.4/notes/
> where it says:
> "The socket module now supports Bluetooth sockets,
> if the system has <bluetooth/bluetooth.h>"
>
> Yet I can't find anything at all in the socket manuals
> nor anywhere else on the site...
>
> Does the socket module really support Bluetooth out of the box?
> I've used socket before but never read anything about bluetooth...
>
> Maybe I need to get the bluetooth.h file, but i have no idea what I
> am supposed to do with it...
>
> Can anyone shed some light on this for me please?
>
> thanks in advance,
>
> gr
> Arno

Have you come across the PyBluez library yet? I recently used it in a 
project and it worked very well.

Hth,
Jeff
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From no.email at please.post  Wed Mar 10 10:19:04 2010
From: no.email at please.post (kj)
Date: Wed, 10 Mar 2010 15:19:04 +0000 (UTC)
Subject: Anything like "Effective Java" for Python?
Message-ID: <hn8d98$m0d$1@reader1.panix.com>




Subject line pretty much says it all: is there a book like "Effective
Java" for Python.  I.e. a book that assumes that readers are
experienced programmers that already know the basics of the language,
and want to focus on more advanced programming issues?

~K


From simon at brunningonline.net  Wed Mar 10 10:29:44 2010
From: simon at brunningonline.net (Simon Brunning)
Date: Wed, 10 Mar 2010 15:29:44 +0000
Subject: Anything like "Effective Java" for Python?
In-Reply-To: <hn8d98$m0d$1@reader1.panix.com>
References: <hn8d98$m0d$1@reader1.panix.com>
Message-ID: <8c7f10c61003100729j2afba0c9rf00760e48f535249@mail.gmail.com>

On 10 March 2010 15:19, kj <no.email at please.post> wrote:
> Subject line pretty much says it all: is there a book like "Effective
> Java" for Python. ?I.e. a book that assumes that readers are
> experienced programmers that already know the basics of the language,
> and want to focus on more advanced programming issues?

<http://www.packtpub.com/expert-python-programming/book> is good.

-- 
Cheers,
Simon B.


From echerlin at gmail.com  Wed Mar 10 10:31:35 2010
From: echerlin at gmail.com (Edward Cherlin)
Date: Wed, 10 Mar 2010 10:31:35 -0500
Subject: [Edu-sig] Method / Functions - What are the differences?
In-Reply-To: <4B97B092.4060901@optimum.net>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<hmlte9$d0f$1@dough.gmane.org>
	<mailman.205.1267633968.23598.python-list@python.org>
	<4b8e9660$0$21812$426a34cc@news.free.fr>
	<hmmrh4$644$1@newsreader3.netcologne.de>
	<4B8EF717.3070701@optimum.net> <4b902338$0$31260$607ed4bc@cv.net>
	<4b90f5eb$0$9148$426a74cc@news.free.fr>
	<4b911ee0$0$4988$607ed4bc@cv.net> <4B97B092.4060901@optimum.net>
Message-ID: <e574f6eb1003100731u7e07f058lf86af48f991b1e0c@mail.gmail.com>

On Wed, Mar 10, 2010 at 09:45, John Posner <jjposner at optimum.net> wrote:
> [ cross-posting to edu-sig ]
>
> Bruno (and anyone else interested) --
>
> As I promised/threatened, here's the *start* of a write-up on properties,
> aimed at non-advanced Python programmers:
>
> ?http://www.jjposner.net/media/python-properties-0310.pdf
>
> I'm interested in corrections, of course. But I'm also interested in
> opinions as to whether this somewhat lengthy treatment is worth the effort
> -- does it improve on existing write-ups?

I find that it will explain things to those who already understand
most of the concepts. However, I felt as though I were being led
through a maze without knowing where we were headed. This suggests
that the concepts can be re-ordered in a manner that will help your
readers more, and then we can refactor further. (Yes, you can apply
Extreme Programming concepts to create Extreme Documentation,
including consultations with users, pair or group writing, frequent
refactoring, and more, as at FLOSSManuals.net.)

Who is your expected audience?

> Tx,
> John
>
> _______________________________________________
> Edu-sig mailing list
> Edu-sig at python.org
> http://mail.python.org/mailman/listinfo/edu-sig
>



-- 
Edward Mokurai (??/???????????????/????????????? ?) Cherlin
Silent Thunder is my name, and Children are my nation.
The Cosmos is my dwelling place, the Truth my destination.
http://www.earthtreasury.org/


From bsagert at gmail.com  Wed Mar 10 10:55:27 2010
From: bsagert at gmail.com (Bill)
Date: Wed, 10 Mar 2010 07:55:27 -0800 (PST)
Subject: I passed a fizzbuzz test but failed at recursion.
Message-ID: <2380120f-c273-4179-af80-ecc8954a6bd3@b7g2000yqd.googlegroups.com>

Look at this recursive fizzbuzz function from
http://www.codinghorror.com/blog/2007/02/why-cant-programmers-program.html

def fizzbuzz(num):
    if num:
        if num % 15 is 0: return fizzbuzz(num-1) + 'fizzbuzz \n'
        elif num % 5 is 0: return fizzbuzz(num-1) + 'buzz \n'
        elif num % 3 is 0: return fizzbuzz(num-1) + 'fizz \n'
        else : return fizzbuzz(num-1) + ('%d \n' % num)
    return ''
print fizzbuzz(100)

This returns "1 2 fizz 4 ...etc... 97 98 fizz buzz" which is correct.

However, when I try to decipher the logic of the function I imagine
the solution reversed as "buzz fizz 98 97 ...etc... 4 fizz 2 1".

After all, the first num is 100 which decrements by one until a zero
stops the recursive loop.

My (faulty) reasoning is that fizzbuzz(100) would firstly print a
"fizz" and  the last fizzbuzz(1) would finally print a "1".

My logic is wrong, but I don't know why.


From hv at tbz-pariv.de  Wed Mar 10 11:08:44 2010
From: hv at tbz-pariv.de (Thomas Guettler)
Date: Wed, 10 Mar 2010 17:08:44 +0100
Subject: os.rename [Errno 31] Too many links
In-Reply-To: <253f4908-1cb9-4165-bf01-1d89b39d3b35@k6g2000prg.googlegroups.com>
References: <253f4908-1cb9-4165-bf01-1d89b39d3b35@k6g2000prg.googlegroups.com>
Message-ID: <7vpugdF5bqU1@mid.individual.net>

Richard wrote:
> I want to atomically write to a file so have been using temporary
> files and renaming:
> 
> temp = tempfile.NamedTemporaryFile(delete=False)
> temp.file.write(data)
> temp.file.close()
> os.rename(temp.name, output_file)
> 
> This worked but after 39567 files os.rename raises an OSError: [Errno
> 31] Too many links
> 
> I can still create files in this directory so I doubt it is a platform
> limitation.
> Can you tell what is wrong? Am I not freeing the temporary file
> resources properly?

If you are on linux you can have a look at the open file descriptors of
a running process like this:

ls -l /proc/PID/fd/

But I guess it is a limitation of your filesystem. What do you use?

I once had this problem with ext2. It has a low limit for
subdirectories.

With xfs the limits are much greater.

  Thomas


-- 
Thomas Guettler, http://www.thomas-guettler.de/
E-Mail: guettli (*) thomas-guettler + de


From chris.hulan at gmail.com  Wed Mar 10 11:24:00 2010
From: chris.hulan at gmail.com (Chris Hulan)
Date: Wed, 10 Mar 2010 08:24:00 -0800 (PST)
Subject: I passed a fizzbuzz test but failed at recursion.
References: <2380120f-c273-4179-af80-ecc8954a6bd3@b7g2000yqd.googlegroups.com>
Message-ID: <749d9c6e-f41f-4859-9c57-459caeddf6e4@j27g2000yqn.googlegroups.com>

On Mar 10, 10:55?am, Bill <bsag... at gmail.com> wrote:
> Look at this recursive fizzbuzz function fromhttp://www.codinghorror.com/blog/2007/02/why-cant-programmers-program...
>
> def fizzbuzz(num):
> ? ? if num:
> ? ? ? ? if num % 15 is 0: return fizzbuzz(num-1) + 'fizzbuzz \n'
> ? ? ? ? elif num % 5 is 0: return fizzbuzz(num-1) + 'buzz \n'
> ? ? ? ? elif num % 3 is 0: return fizzbuzz(num-1) + 'fizz \n'
> ? ? ? ? else : return fizzbuzz(num-1) + ('%d \n' % num)
> ? ? return ''
> print fizzbuzz(100)
>
> This returns "1 2 fizz 4 ...etc... 97 98 fizz buzz" which is correct.
>
> However, when I try to decipher the logic of the function I imagine
> the solution reversed as "buzz fizz 98 97 ...etc... 4 fizz 2 1".
>
> After all, the first num is 100 which decrements by one until a zero
> stops the recursive loop.
>
> My (faulty) reasoning is that fizzbuzz(100) would firstly print a
> "fizz" and ?the last fizzbuzz(1) would finally print a "1".
>
> My logic is wrong, but I don't know why.

There's only one print, it prints the string returned by fizzbuzz(100)
The string is constructed via recursion
ie:
fizzbuzz(6)
 fizzbuzz(5)
  fizzbuzz(4)
   fizzbuzz(3)
    fizzbuzz(2)
     fizzbuzz(1)
      fizzbuzz(0)
     ''+'1 \n'
    '1 \n'+'2 \n'
   '1 \n2 \n'+'fizz \n'
  '1 \n2 \n fizz \n'+'4 \n'
 '1 \n2 \n fizz \n4 \n'+'buzz \n'
'1 \n2 \n fizz \n4 \nbuzz \n'+'fizz \n'

print '1 \n2 \n fizz \n4 \nbuzz \nfizz \n'

clear as mud ;)


From clp2 at rebertia.com  Wed Mar 10 11:31:06 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 10 Mar 2010 08:31:06 -0800
Subject: Interacting With Another Script
In-Reply-To: <4dc0cfea1003100432h2495ede1vf5e5bd75172ab5ea@mail.gmail.com>
References: <4dc0cfea1003100432h2495ede1vf5e5bd75172ab5ea@mail.gmail.com>
Message-ID: <50697b2c1003100831l302a84e2j1aeaf351dd4e1fe6@mail.gmail.com>

On Wed, Mar 10, 2010 at 4:32 AM, Victor Subervi <victorsubervi at gmail.com> wrote:
> Hi;
> There's a program (vpopmail) that has commands which, when called, request
> input ("email address", "password", etc.) from the command line. I would
> like to build a TTW interface for my clients to use that interacts with
> these commands. It's easy enough for me to get the information from a
> script, but how do I input it when these functions keep requesting
> information? I hope I've made myself clear :-}

(assuming TTW = Thru The Web; been a while since I've come across an
unknown, non-new acronym)

[Disclaimer: I know zilch about vpopmail's specifics]

Option A. Check for when the latest output looks prompt-like (e.g.
colon followed by a space; this will be program-specific and possibly
different for vpopmail) and then ask for input. For example:
1. Get new session request from client
2. Run new vpopmail process
3. Wait until prompt detected in process' output
4. Send back webpage with the output and a <form> to answer the prompt
5. Write user's response from form as input to process.
6. If read EOF, send final output back as webpage to client and close
session. Else, GOTO 3
(See also: expect)

Option B. Web pseudo-shell using AJAX. Client polls server for new
output. Client pushes new input to server at any time.
1. Get new session request from client
2. Run new vpopmail process
3. Send back webpage w/ JavaScript code
4.1. Client periodically polls server for new output via AJAX and
displays it when there is some.
4.2. Client has omnipresent <form> that on submission sends an AJAX
request to the server with the given input.
5. If get input message from client, write input to process' stdin. If
get polling message from client, do non-blocking read on the process'
output and respond with the result. If get EOF, inform client on next
poll and then close session.

Option C. The most user-friendly, and in some sense simplest, one.
Figure out the "conversation tree" vpopmail follows. Create a matching
form tree workflow, presenting multiple input fields at once. Run
vpopmail and write the appropriate input to its stdin based on the
form data. Send the output back as a webpage.

[Session management & timeouts in the preceding are left as exercises
for the implementor]

Option D. The Zen option: It seems quite probable that someone's
already written a web frontend for vpopmail
administration/configuration. Just use that. The best software is that
which you don't have to write.

Cheers,
Chris
--
Ironically, I have yet to code a webapp.
http://blog.rebertia.com


From clp2 at rebertia.com  Wed Mar 10 11:39:57 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 10 Mar 2010 08:39:57 -0800
Subject: Interacting With Another Script
In-Reply-To: <4dc0cfea1003100834g5d611cdcg63842d385f350fe7@mail.gmail.com>
References: <4dc0cfea1003100432h2495ede1vf5e5bd75172ab5ea@mail.gmail.com>
	<50697b2c1003100831l302a84e2j1aeaf351dd4e1fe6@mail.gmail.com>
	<4dc0cfea1003100834g5d611cdcg63842d385f350fe7@mail.gmail.com>
Message-ID: <50697b2c1003100839w5dc9a63fo5702ef1e842f40da@mail.gmail.com>

On Wed, Mar 10, 2010 at 8:34 AM, Victor Subervi <victorsubervi at gmail.com> wrote:
> On Wed, Mar 10, 2010 at 12:31 PM, Chris Rebert <clp2 at rebertia.com> wrote:
>> Option C. The most user-friendly, and in some sense simplest, one.
>> Figure out the "conversation tree" vpopmail follows. Create a matching
>> form tree workflow, presenting multiple input fields at once. Run
>> vpopmail and write the appropriate input to its stdin based on the
>> form data. Send the output back as a webpage.
>
> Yeah, that was my idea. But how does the program know when it's being
> prompted to enter data? That's my question ;)

There's no magical "prompt time". The process's stdin's openness to
writing is not conditional.
Just send it all the input at once with the proper newlines in place
and it should work just fine assuming the user input was valid
(barring vpopmail using some fancy terminal input malarkey like
curses).

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


From invalid at invalid.invalid  Wed Mar 10 11:44:29 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Wed, 10 Mar 2010 16:44:29 +0000 (UTC)
Subject: Interacting With Another Script
References: <4dc0cfea1003100432h2495ede1vf5e5bd75172ab5ea@mail.gmail.com>
	<50697b2c1003100831l302a84e2j1aeaf351dd4e1fe6@mail.gmail.com>
	<4dc0cfea1003100834g5d611cdcg63842d385f350fe7@mail.gmail.com>
	<mailman.560.1268239200.23598.python-list@python.org>
Message-ID: <hn8i9d$qeg$1@reader1.panix.com>

On 2010-03-10, Chris Rebert <clp2 at rebertia.com> wrote:
> On Wed, Mar 10, 2010 at 8:34 AM, Victor Subervi <victorsubervi at gmail.com> wrote:
>
>> Yeah, that was my idea. But how does the program know when it's being
>> prompted to enter data? That's my question ;)
>
> There's no magical "prompt time".

That depends on the program.  Some programs that prompt for input
(particulary username/password) flush stdin before displaying each
prompt.  I'm not saying the program in question does that...

> The process's stdin's openness to writing is not conditional.

That doesn't mean that data written prior to the prompt won't be
ignore.

> Just send it all the input at once with the proper newlines in place
> and it should work just fine assuming the user input was valid
> (barring vpopmail using some fancy terminal input malarkey like
> curses).

It's worth trying, but there's a slight chance it won't work.

-- 
Grant Edwards               grant.b.edwards        Yow! But they went to MARS
                                  at               around 1953!!
                              gmail.com            


From chris at simplistix.co.uk  Wed Mar 10 11:46:23 2010
From: chris at simplistix.co.uk (Chris Withers)
Date: Wed, 10 Mar 2010 16:46:23 +0000
Subject: Anything like "Effective Java" for Python?
In-Reply-To: <hn8d98$m0d$1@reader1.panix.com>
References: <hn8d98$m0d$1@reader1.panix.com>
Message-ID: <4B97CCDF.7070802@simplistix.co.uk>

kj wrote:
> 
> 
> Subject line pretty much says it all: is there a book like "Effective
> Java" 

oxymoronic, no?

Sorry, couldn't resist ;-)

Chris

-- 
Simplistix - Content Management, Batch Processing & Python Consulting
             - http://www.simplistix.co.uk


From krishna.k.0001 at gmail.com  Wed Mar 10 11:47:44 2010
From: krishna.k.0001 at gmail.com (Krishna K)
Date: Wed, 10 Mar 2010 08:47:44 -0800
Subject: Scalable python dict {'key_is_a_string': [count, some_val]}
In-Reply-To: <6cc20cea1002192327v364fd099r242b97a6316f6051@mail.gmail.com>
References: <4e44ed04-7175-470a-99cb-cf51a93ff5f4@k41g2000yqm.googlegroups.com>
	<6cc20cea1002192327v364fd099r242b97a6316f6051@mail.gmail.com>
Message-ID: <d0e634591003100847j981c934n8f1d4d329dfabb87@mail.gmail.com>

On Fri, Feb 19, 2010 at 11:27 PM, Jonathan Gardner <
jgardner at jonathangardner.net> wrote:

> On Fri, Feb 19, 2010 at 10:36 PM, krishna <krishna.k.0001 at gmail.com>
> wrote:
> > I have to manage a couple of dicts with huge dataset (larger than
> > feasible with the memory on my system), it basically has a key which
> > is a string (actually a tuple converted to a string) and a two item
> > list as value, with one element in the list being a count related to
> > the key. I have to at the end sort this dictionary by the count.
> >
> > The platform is linux. I am planning to implement it by setting a
> > threshold beyond which I write the data into files (3 columns: 'key
> > count some_val' ) and later merge those files (I plan to sort the
> > individual files by the key column and walk through the files with one
> > pointer per file and merge them; I would add up the counts when
> > entries from two files match by key) and sorting using the 'sort'
> > command. Thus the bottleneck is the 'sort' command.
> >
> > Any suggestions, comments?
> >
>
> You should be using BDBs or even something like PostgreSQL. The
> indexes there will give you the scalability you need. I doubt you will
> be able to write anything that will select, update, insert or delete
> data better than what BDBs and PostgreSQL can give you.
>
> --
> Jonathan Gardner
> jgardner at jonathangardner.net


Thank you. I tried BDB, it seems to get very very slow as you scale.

Thank you,
Krishna
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From phlip2005 at gmail.com  Wed Mar 10 11:54:51 2010
From: phlip2005 at gmail.com (Phlip)
Date: Wed, 10 Mar 2010 08:54:51 -0800 (PST)
Subject: equivalent of Ruby's Pathname?
References: <843d5af9-e8db-4352-a853-4c99664eadf8@k6g2000prg.googlegroups.com>
	<22ac2bce-cf12-45e2-9d89-d7df56a2faa7@b1g2000prc.googlegroups.com> 
	<dcace5fc-5ae9-4756-942d-6da7da2f660d@s36g2000prh.googlegroups.com> 
	<91770e62-2fef-45c9-9e4d-e64088058af1@g8g2000pri.googlegroups.com> 
	<7tceiuF94hU1@mid.individual.net>
	<d871b429-deff-4974-84f3-d5f19c6b9042@u15g2000prd.googlegroups.com>
	<hn6na6$2ci$1@news.eternal-september.org>
Message-ID: <aabee5b1-5c7d-4248-b096-99b5549c739a@o3g2000yqb.googlegroups.com>

Martin P. Hellwig wrote:

> Well even if this statement would be true, I personally think that not
> proclaiming something a 'standard' if you are sure that you are not sure
> about it, is a virtue.

In terms of trying too hard to achieve perfection, am I missing a
Python repository similar to the C++ Boost project? All the nice-to-
have classes that extend the core of C++ get to live in Boost before
the C++ Committee pulls the best ideas off the top and add them to the
Standard Library...

--
  Phlip
  http://penbird.tumblr.com/


From clp2 at rebertia.com  Wed Mar 10 12:15:07 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 10 Mar 2010 09:15:07 -0800
Subject: equivalent of Ruby's Pathname?
In-Reply-To: <aabee5b1-5c7d-4248-b096-99b5549c739a@o3g2000yqb.googlegroups.com>
References: <843d5af9-e8db-4352-a853-4c99664eadf8@k6g2000prg.googlegroups.com>
	<22ac2bce-cf12-45e2-9d89-d7df56a2faa7@b1g2000prc.googlegroups.com>
	<dcace5fc-5ae9-4756-942d-6da7da2f660d@s36g2000prh.googlegroups.com>
	<91770e62-2fef-45c9-9e4d-e64088058af1@g8g2000pri.googlegroups.com>
	<7tceiuF94hU1@mid.individual.net>
	<d871b429-deff-4974-84f3-d5f19c6b9042@u15g2000prd.googlegroups.com>
	<hn6na6$2ci$1@news.eternal-september.org>
	<aabee5b1-5c7d-4248-b096-99b5549c739a@o3g2000yqb.googlegroups.com>
Message-ID: <50697b2c1003100915u206aaef9n314503b3cb9d6187@mail.gmail.com>

On Wed, Mar 10, 2010 at 8:54 AM, Phlip <phlip2005 at gmail.com> wrote:
> Martin P. Hellwig wrote:
>> Well even if this statement would be true, I personally think that not
>> proclaiming something a 'standard' if you are sure that you are not sure
>> about it, is a virtue.
>
> In terms of trying too hard to achieve perfection, am I missing a
> Python repository similar to the C++ Boost project? All the nice-to-
> have classes that extend the core of C++ get to live in Boost before
> the C++ Committee pulls the best ideas off the top and add them to the
> Standard Library...

The next closest thing would probably be the Python Cookbook:
http://code.activestate.com/recipes/langs/python/

However, such stuff can also be found as third-party modules.

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


From duncan.booth at invalid.invalid  Wed Mar 10 12:26:46 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 10 Mar 2010 17:26:46 GMT
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<4b90a1f8$0$1629$742ec2ed@news.sonic.net>
	<0d381135-730a-45e4-9225-9ba2a29b77fe@k2g2000pro.googlegroups.com>
	<Xns9D35C3BFCE829duncanbooth@127.0.0.1>
	<13c167f4-5e37-48a0-a480-3494c212035c@k5g2000pra.googlegroups.com>
Message-ID: <Xns9D37B1793F70Aduncanbooth@127.0.0.1>

Xah Lee <xahlee at gmail.com> wrote:

> On Mar 8, 11:14??am, Duncan Booth <duncan.bo... at invalid.invalid>
> wrote: 
>> Xah Lee <xah... at gmail.com> wrote:
>> > For example, consider, if you are within world's top 100th user of
>> > database in terms of database size, such as Google, then it may be
>> > that the off-the-shelf tools may be limiting. But how many users
>> > really have such massive size of data?
>>
>> You've totally missed the point. It isn't the size of the data you
>> have today that matters, it's the size of data you could have in
>> several years 
> '
>> time.
> 
> so, you saying, in several years, we'd all become the world's top 100
> database users in terms of size, like Google?
> 
No, I'm saying that if you plan to build a business that could grow you 
should be clear up front how you plan to handle the growth. It's too late 
if you suddenly discover your platform isn't scalable just when you need to 
scale it.



From duncan.booth at invalid.invalid  Wed Mar 10 12:39:27 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 10 Mar 2010 17:39:27 GMT
Subject: Can't define __call__ within __init__?
References: <hn85re$vj9$1@dough.gmane.org>
	<8c7f10c61003100527o7c7f9375ie662ce67ab78f1de@mail.gmail.com>
	<mailman.549.1268228501.23598.python-list@python.org>
Message-ID: <Xns9D37B39F7893Bduncanbooth@127.0.0.1>

Neal Becker <ndbecker2 at gmail.com> wrote:

> What I'm trying to do is make a callable whose behavior is switched
> based on some criteria that will be fixed for all calls.  In my
> example, this will ultimately be determined by the setting of a
> command line switch. 
> 
If you want different behaviour its usually best to use different classes.

You can keep all the common behaviour in a base class and just override the 
__call__ method for the different behaviour. Then use a factory function to 
decide which class to instantiate or else override __new__ and make the 
decision there. e.g.

>>> class X(object):
	def __call__(self):
		return 0
	def __new__(cls, i):
		if i!=0:
			cls = Y
		return object.__new__(cls)

	
>>> class Y(X):
	def __call__(self):
		return 1

	
>>> x = X(0)
>>> x()
0
>>> y = X(1)
>>> y()
1
>>> isinstance(x, X)
True
>>> isinstance(y, X)
True

P.S. I don't know what you did in your post but your Followup-To header is 
pointing to a group on gmane which makes extra work for me replying. Please 
don't do that.


From dickinsm at gmail.com  Wed Mar 10 12:47:19 2010
From: dickinsm at gmail.com (Mark Dickinson)
Date: Wed, 10 Mar 2010 09:47:19 -0800 (PST)
Subject: Calculating very large exponents in python
References: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>
	<f3cc57c61003071240x18b580bend946824ef7955b6c@mail.gmail.com> 
	<COL110-W1236CED756D3C9374CB0A2B7350@phx.gbl>
	<mailman.466.1268075137.23598.python-list@python.org> 
	<90e5f42d-b0d0-4578-82ea-9d0e5770048b@k2g2000pro.googlegroups.com>
Message-ID: <a4cea7a1-7242-42fc-8050-84b9e2b59459@d2g2000yqa.googlegroups.com>

On Mar 9, 6:39?am, casevh <cas... at gmail.com> wrote:
> [also replying to Geremy since the OP's message doesn't appear...]
>
> On Mar 8, 11:05?am, geremy condra <debat... at gmail.com> wrote:
>
>
>
>
>
> > On Mon, Mar 8, 2010 at 2:15 AM, Fahad Ahmad <miracles... at hotmail.com> wrote:
> > > Thanks Geremy,
>
> > > That has been an absolute bump........... GOD i cant sit on my chair, it has
> > > worked even on 512 bit number and with no time..........
> > > superb i would say.
>
> > > lastly, i am using the code below to calculate Largest Prime factor of a
> > > number:
>
> > > print
> > > ('''======================================================================= ?========'''
> > > ?????? '''????????????? CALCULATE? HIGHEST PRIME
> > > FACTOR????????????????????????????????? '''
>
> > > '''======================================================================== ?=======''')
>
> > > #!/usr/bin/env python
> > > def highest_prime_factor(n):
> > > ?? if isprime(n):
> > > ????? return n
> > > ?? for x in xrange(2,n ** 0.5 + 1):
> > > ????? if not n % x:
> > > ???????? return highest_prime_factor(n/x)
> > > def isprime(n):
> > > ?? for x in xrange(2,n ** 0.5 + 1):
> > > ????? if not n % x:
> > > ???????? return False
> > > ?? return True
> > > if? __name__ == "__main__":
> > > ?? import time
> > > ?? start = time.time()
> > > ?? print highest_prime_factor(1238162376372637826)
> > > ?? print time.time() - start
>
> > > the code works with a bit of delay on the number : "1238162376372637826" but
> > > extending it to
> > > (10902610991329142436630551158108608965062811746392577675456004845499113044 ?30471090261099132914243663055115810860896506281174639257767545600484549911 3?0443047)
> > > ?makes python go crazy. Is there any way just like above, i can have it
> > > calculated it in no time.
>
> > > thanks for the support.
>
> > If you're just looking for the largest prime factor I would suggest using
> > a fermat factorization attack. In the example you gave, it returns
> > nearly immediately.
>
> > Geremy Condra- Hide quoted text -
>
> > - Show quoted text -
>
> For a Python-based solution, you might want to look at pyecm (http://
> sourceforge.net/projects/pyecm/)
>
> On a system with gmpy installed also, pyecm found the following
> factors:
>
> 101, 521, 3121, 9901, 36479, 300623, 53397071018461,
> 1900381976777332243781
>
> There still is a 98 digit unfactored composite:
>
> 602525071745682437589111511878284384468144476539868422797968232621651594065 00174226172705680274911
>
> Factoring this remaining composite using ECM may not be practical.
>
> casevh

The complete factorization is: 101 x 521 x 3121 x 9901 x 36479 x
300623 x 53397071018461 x 1900381976777332243781 x
6060517860310398033985611921721 x
9941808367425935774306988776021629111399536914790551022447994642391

It helps if you notice that the digits of the original 156-digit
number come from concatenating a 78-digit string to itself, giving an
immediate factor of 10**78 + 1.  (Oops.  Perhaps this was supposed to
be a secret back door to the OP's crypto scheme.  I've given it away
now. :))

--
Mark


From barry at python.org  Wed Mar 10 12:50:10 2010
From: barry at python.org (Barry Warsaw)
Date: Wed, 10 Mar 2010 12:50:10 -0500
Subject: Python 2.6.5 release candidate 2 now available
Message-ID: <20100310125010.415f838e@heresy.wooz.org>

Hi everyone,

The source tarballs and Windows installer for Python 2.6.5 release candidate 2
are now available:

http://www.python.org/download/releases/2.6.5/

As usual, please download, install, and test them with your favorite projects
and environments.  A number of regressions and build problems on OS X have
been fixed since rc1, and I'm really hoping we will not have to do an rc3.
I'm currently planning on releasing 2.6.5 final on March 19, 2010.

Enjoy,
-Barry

P.S. The Mac installer will hopefully be available soon.

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From dickinsm at gmail.com  Wed Mar 10 12:51:23 2010
From: dickinsm at gmail.com (Mark Dickinson)
Date: Wed, 10 Mar 2010 09:51:23 -0800 (PST)
Subject: Calculating very large exponents in python
References: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>
	<f3cc57c61003071240x18b580bend946824ef7955b6c@mail.gmail.com> 
	<COL110-W1236CED756D3C9374CB0A2B7350@phx.gbl>
	<mailman.466.1268075137.23598.python-list@python.org> 
	<90e5f42d-b0d0-4578-82ea-9d0e5770048b@k2g2000pro.googlegroups.com> 
	<e0a6a1a2-77b4-48ac-81aa-4f34b6130e06@u19g2000prh.googlegroups.com>
Message-ID: <9a244983-53ab-4ee5-a176-c67332337c96@15g2000yqi.googlegroups.com>

On Mar 9, 1:54?pm, casevh <cas... at gmail.com> wrote:
> After a few hours, the remaining factors are
>
> 6060517860310398033985611921721
>
> and
>
> 9941808367425935774306988776021629111399536914790551022447994642391
>
> casevh

Whoops---I missed this.  I'm too slow!  But at least my answers agree
with yours.  (Factoring 10**78+1 took around 7 seconds using GP/Pari
on a 2.5 GHz MacBook;  factoring the remaining quotient n / (10**78+1)
was much quicker.)

--
Mark


From tjreedy at udel.edu  Wed Mar 10 12:52:47 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 10 Mar 2010 12:52:47 -0500
Subject: I passed a fizzbuzz test but failed at recursion.
In-Reply-To: <2380120f-c273-4179-af80-ecc8954a6bd3@b7g2000yqd.googlegroups.com>
References: <2380120f-c273-4179-af80-ecc8954a6bd3@b7g2000yqd.googlegroups.com>
Message-ID: <hn8m9g$3rc$1@dough.gmane.org>

On 3/10/2010 10:55 AM, Bill wrote:
> Look at this recursive fizzbuzz function from
> http://www.codinghorror.com/blog/2007/02/why-cant-programmers-program.html
>
> def fizzbuzz(num):
>      if num:
>          if num % 15 is 0: return fizzbuzz(num-1) + 'fizzbuzz \n'
>          elif num % 5 is 0: return fizzbuzz(num-1) + 'buzz \n'
>          elif num % 3 is 0: return fizzbuzz(num-1) + 'fizz \n'

In all 3 branches, 'is' should be '=='. As written, this code depends on 
the implementation treating 0 as a singleton, which CPython does as an 
optimization, but which the language def does not require.

>          else : return fizzbuzz(num-1) + ('%d \n' % num)
>      return ''
> print fizzbuzz(100)
>
> This returns "1 2 fizz 4 ...etc... 97 98 fizz buzz" which is correct.
>
> However, when I try to decipher the logic of the function I imagine
> the solution reversed as "buzz fizz 98 97 ...etc... 4 fizz 2 1".
>
> After all, the first num is 100 which decrements by one until a zero
> stops the recursive loop.
>
> My (faulty) reasoning is that fizzbuzz(100) would firstly print a
> "fizz" and  the last fizzbuzz(1) would finally print a "1".

If one reversed the string addition in each branch, it would.
As written, the 'word' for n is tacked on at the end.

> My logic is wrong, but I don't know why.

Is this slightly revised version any clearer?

def fizzbuzz_rb(n):
     if n:
         previous = fizzbuzz_rb(n-1)
         word = (not n % 15 and 'fizzbuzz \n' or
                 not n % 5  and 'buzz \n' or
                 not n % 3  and 'fizz \n' or
                 '%d \n' % n)
         return previous + word
     else:
         return ''

or this equivalent tail-recursive version?

def fizzbuzz_rt(i,n,s):
     if i <= n:
         word = (not i % 15 and 'fizzbuzz \n' or
                 not i % 5  and 'buzz \n' or
                 not i % 3  and 'fizz \n' or
                '%d \n' % i)
         return fizzbuzz_rt(i+1, n, s+word)
     else:
         return s

or this equivalent iterative version?

def fizzbuzz_it(n):
     s = ''
     for i in range(1,n+1):
         s += (not i % 15 and 'fizzbuzz \n' or
               not i % 5  and 'buzz \n' or
               not i % 3  and 'fizz \n' or
                '%d \n' % i)
     return s

print (fizzbuzz_rb(100) == fizzbuzz_rt(1,100,'') == fizzbuzz_it(100))
# prints True

Terry Jan Reedy



From ndbecker2 at gmail.com  Wed Mar 10 13:23:02 2010
From: ndbecker2 at gmail.com (Neal Becker)
Date: Wed, 10 Mar 2010 13:23:02 -0500
Subject: Can't define __call__ within __init__?
References: <hn85re$vj9$1@dough.gmane.org>
	<8c7f10c61003100527o7c7f9375ie662ce67ab78f1de@mail.gmail.com>
	<mailman.549.1268228501.23598.python-list@python.org>
	<Xns9D37B39F7893Bduncanbooth@127.0.0.1>
Message-ID: <hn8o26$aik$1@dough.gmane.org>

Duncan Booth wrote:
...
> 
> P.S. I don't know what you did in your post but your Followup-To header is
> pointing to a group on gmane which makes extra work for me replying.
> Please don't do that.

I'm sorry about that, there is some bad interaction between gmane's nntp-
smtp gateway and python's mail list.  I don't know what to do about it.  I 
think the problem only happens on python's mail list (I've never seen it 
reported on any of the MANY other lists I use via gmane).



From duncan.booth at invalid.invalid  Wed Mar 10 13:37:59 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 10 Mar 2010 18:37:59 GMT
Subject: Can't define __call__ within __init__?
References: <hn85re$vj9$1@dough.gmane.org>
	<8c7f10c61003100527o7c7f9375ie662ce67ab78f1de@mail.gmail.com>
	<mailman.549.1268228501.23598.python-list@python.org>
	<Xns9D37B39F7893Bduncanbooth@127.0.0.1>
	<mailman.567.1268245398.23598.python-list@python.org>
Message-ID: <Xns9D37BCD4B883Bduncanbooth@127.0.0.1>

Neal Becker <ndbecker2 at gmail.com> wrote:

> Duncan Booth wrote:
> ...
>> 
>> P.S. I don't know what you did in your post but your Followup-To
>> header is pointing to a group on gmane which makes extra work for me
>> replying. Please don't do that.
> 
> I'm sorry about that, there is some bad interaction between gmane's
> nntp- smtp gateway and python's mail list.  I don't know what to do
> about it.  I think the problem only happens on python's mail list
> (I've never seen it reported on any of the MANY other lists I use via
> gmane). 
> 
Are the other mailing lists gatewayed from Usenet? It may not matter if 
there's a followup-to header on a mailing list, it probably just gets 
ignored, but it does matter on Usenet (which after all is what Gmane is 
emulating).


From debatem1 at gmail.com  Wed Mar 10 13:49:59 2010
From: debatem1 at gmail.com (geremy condra)
Date: Wed, 10 Mar 2010 13:49:59 -0500
Subject: Scalable python dict {'key_is_a_string': [count, some_val]}
In-Reply-To: <d0e634591003100847j981c934n8f1d4d329dfabb87@mail.gmail.com>
References: <4e44ed04-7175-470a-99cb-cf51a93ff5f4@k41g2000yqm.googlegroups.com>
	<6cc20cea1002192327v364fd099r242b97a6316f6051@mail.gmail.com>
	<d0e634591003100847j981c934n8f1d4d329dfabb87@mail.gmail.com>
Message-ID: <f3cc57c61003101049s3d7e76d7me28f594be2d1a6ac@mail.gmail.com>

On Wed, Mar 10, 2010 at 11:47 AM, Krishna K <krishna.k.0001 at gmail.com> wrote:
>
>
> On Fri, Feb 19, 2010 at 11:27 PM, Jonathan Gardner
> <jgardner at jonathangardner.net> wrote:
>>
>> On Fri, Feb 19, 2010 at 10:36 PM, krishna <krishna.k.0001 at gmail.com>
>> wrote:
>> > I have to manage a couple of dicts with huge dataset (larger than
>> > feasible with the memory on my system), it basically has a key which
>> > is a string (actually a tuple converted to a string) and a two item
>> > list as value, with one element in the list being a count related to
>> > the key. I have to at the end sort this dictionary by the count.
>> >
>> > The platform is linux. I am planning to implement it by setting a
>> > threshold beyond which I write the data into files (3 columns: 'key
>> > count some_val' ) and later merge those files (I plan to sort the
>> > individual files by the key column and walk through the files with one
>> > pointer per file and merge them; I would add up the counts when
>> > entries from two files match by key) and sorting using the 'sort'
>> > command. Thus the bottleneck is the 'sort' command.
>> >
>> > Any suggestions, comments?
>> >
>>
>> You should be using BDBs or even something like PostgreSQL. The
>> indexes there will give you the scalability you need. I doubt you will
>> be able to write anything that will select, update, insert or delete
>> data better than what BDBs and PostgreSQL can give you.
>>
>> --
>> Jonathan Gardner
>> jgardner at jonathangardner.net
>
> Thank you. I tried BDB, it seems to get very very slow as you scale.
>
> Thank you,
> Krishna

Have you tried any of the big key-value store systems, like couchdb etc?

Geremy Condra


From mrkafk at gmail.com  Wed Mar 10 13:58:07 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 10 Mar 2010 19:58:07 +0100
Subject: Text mining in Python
Message-ID: <hn8q40$ip1$1@dough.gmane.org>

Hello everyone,

I need to do the following:

(0. transform words in a document into word roots)

1. analyze a set of documents to see which words are highly frequent

2. detect clusters of those highly frequent words

3. map the clusters to some "special" keywords

4. rank the documents on clusters and "top n" most frequent words

5. provide search that would rank documents according to whether search 
words were "special" cluster keywords or frequent words

Is there some good open source engine out there that would be suitable 
to the task at hand? Anybody has experience with them?

Now, I do now about NLTK and Python bindings to UIMA. The thing is, I do 
not know if those are good for the above task. If somebody has 
experience with those or other and would be able to say if they're good 
for this, please post.

Regards,
mk



From robert.kern at gmail.com  Wed Mar 10 14:05:38 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 10 Mar 2010 13:05:38 -0600
Subject: Text mining in Python
In-Reply-To: <hn8q40$ip1$1@dough.gmane.org>
References: <hn8q40$ip1$1@dough.gmane.org>
Message-ID: <hn8qi2$jo2$1@dough.gmane.org>

On 2010-03-10 12:58 PM, mk wrote:
> Hello everyone,
>
> I need to do the following:
>
> (0. transform words in a document into word roots)
>
> 1. analyze a set of documents to see which words are highly frequent
>
> 2. detect clusters of those highly frequent words
>
> 3. map the clusters to some "special" keywords
>
> 4. rank the documents on clusters and "top n" most frequent words
>
> 5. provide search that would rank documents according to whether search
> words were "special" cluster keywords or frequent words
>
> Is there some good open source engine out there that would be suitable
> to the task at hand? Anybody has experience with them?

You can probably do most of this with Whoosh:

   http://whoosh.ca/

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From steve at holdenweb.com  Wed Mar 10 14:06:05 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 10 Mar 2010 14:06:05 -0500
Subject: Down casting Python objects
In-Reply-To: <7659cab31003100531i51749f7er6f23ca0ef59cdddf@mail.gmail.com>
References: <7659cab31003091326i6f3ab6bta3b8f5948ab7b0ff@mail.gmail.com>
	<41B1429F-57E8-4F58-883E-03F20FA9A635@gmail.com>
	<7659cab31003100531i51749f7er6f23ca0ef59cdddf@mail.gmail.com>
Message-ID: <hn8qju$j26$1@dough.gmane.org>

Andrey Fedorov wrote:
> On Wed, Mar 10, 2010 at 12:24 AM, Rami Chowdhury
> <rami.chowdhury at gmail.com <mailto:rami.chowdhury at gmail.com>> wrote:
> 
>     Could you tell us *why* you need to down-cast x? Explicit
>     type-casting is usually unnecessary in Python...
> 
> 
> Sure! It's related to the longer question I unwisely asked during PyCon
> [1] (when no one had time to read it, I suppose).
> 
> I have a couple of different flavors of request objects which I'd like
> to make conform to a single interface. So Request `x' come in, I
> determine which kind of request I'm dealing with, and would like to
> "down-cast" it to ARequest or BRequest, classes which will provide
> appropriate accessor properties for the rest of the code to use.
> 
> An option clearly in line with Python's docs might be for `x' to be an
> attribute of an ARequest instance, but that would complicate the code of
> ARequest. What I'm looking for is a way of adding mix-in's at runtime,
> if that makes sense.
> 
The technique you need is not inheritance (which you are really trying
to abuse here, IMHO) but delegation.

Since all requests start out as of the same type, why not just give each
request a handler attribute and set it to a BarHandler or FooHandler
instance as appropriate. Then your generic code can call the handler's
methods, obtaining Foo- or Bar-style behavior as appropriate. If the
handler needs to manipulate the request object then the request object
can pass itself in as a method argument.

Technically your requests are delegating the handling to a subsidiary
object which implements the correct behavior for the request type.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From tack at urandom.ca  Wed Mar 10 14:31:56 2010
From: tack at urandom.ca (Jason Tackaberry)
Date: Wed, 10 Mar 2010 14:31:56 -0500
Subject: Text mining in Python
In-Reply-To: <hn8q40$ip1$1@dough.gmane.org>
References: <hn8q40$ip1$1@dough.gmane.org>
Message-ID: <1268249516.5238.779.camel@arrakis>

On Wed, 2010-03-10 at 19:58 +0100, mk wrote:
> I need to do the following:
[...]
> Is there some good open source engine out there that would be suitable 
> to the task at hand? Anybody has experience with them?

It sounds like a full text search engine might do a bit more than you
need, but based on what you described, should also be sufficient.

I highly recommend Xapian (xapian.org).  It has feature-complete Python
bindings, it's very well designed, and its performance is fantastic.
Xapian supports stemmers for most major languages (except for Asian
languages, unfortunately).

Cheers,
Jason.



From ndbecker2 at gmail.com  Wed Mar 10 14:42:39 2010
From: ndbecker2 at gmail.com (Neal Becker)
Date: Wed, 10 Mar 2010 14:42:39 -0500
Subject: Can't define __call__ within __init__?
References: <hn85re$vj9$1@dough.gmane.org>
	<8c7f10c61003100527o7c7f9375ie662ce67ab78f1de@mail.gmail.com>
	<mailman.549.1268228501.23598.python-list@python.org>
	<Xns9D37B39F7893Bduncanbooth@127.0.0.1>
	<mailman.567.1268245398.23598.python-list@python.org>
	<Xns9D37BCD4B883Bduncanbooth@127.0.0.1>
Message-ID: <hn8snf$sn8$1@dough.gmane.org>

Duncan Booth wrote:

> Neal Becker <ndbecker2 at gmail.com> wrote:
> 
>> Duncan Booth wrote:
>> ...
>>> 
>>> P.S. I don't know what you did in your post but your Followup-To
>>> header is pointing to a group on gmane which makes extra work for me
>>> replying. Please don't do that.
>> 
>> I'm sorry about that, there is some bad interaction between gmane's
>> nntp- smtp gateway and python's mail list.  I don't know what to do
>> about it.  I think the problem only happens on python's mail list
>> (I've never seen it reported on any of the MANY other lists I use via
>> gmane).
>> 
> Are the other mailing lists gatewayed from Usenet? It may not matter if
> there's a followup-to header on a mailing list, it probably just gets
> ignored, but it does matter on Usenet (which after all is what Gmane is
> emulating).

For the record, it isn't really gatewayed to usenet - it's just allowing you 
to read your favorite ML via nntp - which is MUCH more sensible than 
actually having all that mail delivered personally to you, if you read a lot 
of lists.



From jcb at iteris.com  Wed Mar 10 15:03:35 2010
From: jcb at iteris.com (Metalone)
Date: Wed, 10 Mar 2010 12:03:35 -0800 (PST)
Subject: file seek is slow
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>
	<daf5c75e-8139-4a4a-8c27-5cef00327bb1@o3g2000yqb.googlegroups.com>
Message-ID: <d86f1068-8cd4-4489-af00-450d407baf41@g28g2000prb.googlegroups.com>

f1_seek = f1.seek did not change the performance at all.
As it turns out each call is only
646 nanoseconds slower than 'C'.
However, that is still 80% of the time to perform a file seek,
which I would think is a relatively slow operation compared to just
making a system call.


From jcb at iteris.com  Wed Mar 10 15:04:28 2010
From: jcb at iteris.com (Metalone)
Date: Wed, 10 Mar 2010 12:04:28 -0800 (PST)
Subject: file seek is slow
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>
	<iogep59cp5756f63cpqq9dk7m90hdjht6c@4ax.com>
Message-ID: <b8486ec6-47a1-4358-9d16-fc51973ccc76@s25g2000prd.googlegroups.com>

Thanks, Tim.
Good to know.


From robert.kern at gmail.com  Wed Mar 10 15:06:34 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 10 Mar 2010 14:06:34 -0600
Subject: Can't define __call__ within __init__?
In-Reply-To: <hn8snf$sn8$1@dough.gmane.org>
References: <hn85re$vj9$1@dough.gmane.org>	<8c7f10c61003100527o7c7f9375ie662ce67ab78f1de@mail.gmail.com>	<mailman.549.1268228501.23598.python-list@python.org>	<Xns9D37B39F7893Bduncanbooth@127.0.0.1>	<mailman.567.1268245398.23598.python-list@python.org>	<Xns9D37BCD4B883Bduncanbooth@127.0.0.1>
	<hn8snf$sn8$1@dough.gmane.org>
Message-ID: <hn8u4a$2r0$1@dough.gmane.org>

On 2010-03-10 13:42 PM, Neal Becker wrote:
> Duncan Booth wrote:
>
>> Neal Becker<ndbecker2 at gmail.com>  wrote:
>>
>>> Duncan Booth wrote:
>>> ...
>>>>
>>>> P.S. I don't know what you did in your post but your Followup-To
>>>> header is pointing to a group on gmane which makes extra work for me
>>>> replying. Please don't do that.
>>>
>>> I'm sorry about that, there is some bad interaction between gmane's
>>> nntp- smtp gateway and python's mail list.  I don't know what to do
>>> about it.  I think the problem only happens on python's mail list
>>> (I've never seen it reported on any of the MANY other lists I use via
>>> gmane).
>>>
>> Are the other mailing lists gatewayed from Usenet? It may not matter if
>> there's a followup-to header on a mailing list, it probably just gets
>> ignored, but it does matter on Usenet (which after all is what Gmane is
>> emulating).
>
> For the record, it isn't really gatewayed to usenet - it's just allowing you
> to read your favorite ML via nntp - which is MUCH more sensible than
> actually having all that mail delivered personally to you, if you read a lot
> of lists.

python-list is also gatewayed to the real USENET group comp.lang.python in 
addition to its GMane gateway. Duncan is reading comp.lang.python from a real 
USENET server, not via python-list through his email client. Most of the other 
lists you read via GMane aren't gatewayed to the real USENET, so your 
Followup-To header never caused a problem for anyone else.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From robert.kern at gmail.com  Wed Mar 10 15:08:38 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 10 Mar 2010 14:08:38 -0600
Subject: Can't define __call__ within __init__?
In-Reply-To: <hn8o26$aik$1@dough.gmane.org>
References: <hn85re$vj9$1@dough.gmane.org>	<8c7f10c61003100527o7c7f9375ie662ce67ab78f1de@mail.gmail.com>	<mailman.549.1268228501.23598.python-list@python.org>	<Xns9D37B39F7893Bduncanbooth@127.0.0.1>
	<hn8o26$aik$1@dough.gmane.org>
Message-ID: <hn8u86$2r0$2@dough.gmane.org>

On 2010-03-10 12:23 PM, Neal Becker wrote:
> Duncan Booth wrote:
> ...
>>
>> P.S. I don't know what you did in your post but your Followup-To header is
>> pointing to a group on gmane which makes extra work for me replying.
>> Please don't do that.
>
> I'm sorry about that, there is some bad interaction between gmane's nntp-
> smtp gateway and python's mail list.  I don't know what to do about it.  I
> think the problem only happens on python's mail list (I've never seen it
> reported on any of the MANY other lists I use via gmane).

I think it may be your news reader adding the Original-Followup-To header. I use 
Thunderbird 3 to read this list via GMane, too, but my posts do not contain the 
header. What newsreader are you using?

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From lacrima.maxim at gmail.com  Wed Mar 10 15:16:25 2010
From: lacrima.maxim at gmail.com (Lacrima)
Date: Wed, 10 Mar 2010 12:16:25 -0800 (PST)
Subject: Can't install ssl for Python2.5
Message-ID: <3c0d84fc-1975-4937-9b65-88535e699999@u9g2000yqb.googlegroups.com>

Hello!

I use Ubuntu 9.10 Karmic Koala. It has Python 2.6 as default
installation.
And I installed Python 2.5 alongside (for the need of Google
AppEngine). But it seems like my Python 2.5 installation lacks ssl
support. I can't import ssl and starting appengine server fails with
"'module' object has no attribute 'HTTPSHandler'".
So I tried to install this: http://pypi.python.org/pypi/ssl/1.15
But it failed with a very strange error:
sudo easy_install-2.5 ssl
-------------
Searching for ssl
Reading http://pypi.python.org/simple/ssl/
Reading http://docs.python.org/dev/library/ssl.html
Best match: ssl 1.15
Downloading http://pypi.python.org/packages/source/s/ssl/ssl-1.15.tar.gz#md5=81ea8a1175e437b4c769ae65b3290e0c
Processing ssl-1.15.tar.gz
Running ssl-1.15/setup.py -q bdist_egg --dist-dir /tmp/easy_install-
Kd839q/ssl-1.15/egg-dist-tmp-QCIl6J
looking for /usr/include/openssl/ssl.h
looking for /usr/local/ssl/include/openssl/ssl.h
looking for /usr/include/krb5.h
looking for /usr/kerberos/include/krb5.h
error: Setup script exited with error: SandboxViolation: open('/usr/
local/lib/python2.5/test/test_ssl.py', 'wb') {}

The package setup script has attempted to modify files on your system
that are not within the EasyInstall build area, and has been aborted.

This package cannot be safely installed by EasyInstall, and may not
support alternate installation locations even if you run its setup
script by hand.  Please inform the package's author and the
EasyInstall
maintainers to find out if a fix or workaround is available.
-------------

I don't know how to solve this problem and I am looking forward for
help.
Thanks in advance.

with regards,
Maxim.


From mail at hellmutweber.de  Wed Mar 10 16:23:18 2010
From: mail at hellmutweber.de (Hellmut Weber)
Date: Wed, 10 Mar 2010 22:23:18 +0100
Subject: logging: local functions ==> loss of lineno
Message-ID: <4B980DC6.4050807@hellmutweber.de>

Hi Vinay Sajip,
I'm very glad discoverd your logging module ;-)
(That's what I would have liked 25 years ago when I was working as a 
technical software developper!)

Now I'm writing just some personal tools, I like python and want to use 
logging on a regular basis.

Logging works very well giving the filename and line number of the point 
where it is called. As long as I use the loggers directly.
BUT when I have to wrap the logger call in some other function, I always 
get file name and line number of the call of the logger inside the 
wrapping function.

Is there a possibility to get this information in this situation too?

TIA

Hellmut

-- 
Dr. Hellmut Weber         mail at hellmutweber.de
Degenfeldstra?e 2         tel   +49-89-3081172
D-80803 M?nchen-Schwabing mobil +49-172-8450321
please: No DOCs, no PPTs. why: tinyurl.com/cbgq



From martin at v.loewis.de  Wed Mar 10 16:23:38 2010
From: martin at v.loewis.de (Martin v. Loewis)
Date: Wed, 10 Mar 2010 22:23:38 +0100
Subject: Can't install ssl for Python2.5
In-Reply-To: <3c0d84fc-1975-4937-9b65-88535e699999@u9g2000yqb.googlegroups.com>
References: <3c0d84fc-1975-4937-9b65-88535e699999@u9g2000yqb.googlegroups.com>
Message-ID: <hn92kq$fgb$1@online.de>

> I don't know how to solve this problem and I am looking forward for
> help.

Try running "python setup.py install" directly, after downloading and
unpacking the package.

Regards,
Martin


From ldo at geek-central.gen.new_zealand  Wed Mar 10 16:49:51 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Thu, 11 Mar 2010 10:49:51 +1300
Subject: Knight's tour Warndorff's algorithm problem
References: <mailman.527.1268199449.23598.python-list@python.org>
Message-ID: <hn945v$3me$4@lust.ihug.co.nz>

In message <mailman.527.1268199449.23598.python-list at python.org>, Gabriel 
Genellina wrote:

> Warnsdorff's algorithm is heuristic ...

Then it shouldn?t be called an ?algorithm?.


From dreadpiratejeff at gmail.com  Wed Mar 10 16:52:28 2010
From: dreadpiratejeff at gmail.com (J)
Date: Wed, 10 Mar 2010 16:52:28 -0500
Subject: Ideas for creating processes
Message-ID: <36dec4ff1003101352g7d159742j2a0c76a6b0cd23fb@mail.gmail.com>

I'm working on a project and thought I'd ask for a suggestion on how
to proceed (I've got my own ideas, but I wanted to see if I was on the
right track)

For now, I've got this:

def main():
## get our list of directories to refresh
    releases=sys.argv[1:]
    if len(releases) < 1:
        print "You need to provide at least one dir to update"
        sys.exit()

    ## Lets figure out what there is to update
    updateDirs = []
    for rel in releases:
        currentDir = os.path.join(homedir, rel)
        for item in os.listdir(currentDir):
            updateDirs += [os.path.join(homedir, rel, item)]

which returns a list of full pathnames to directories that need to be
updated (updates will be carried out by calling rsync or zsync
eventually)

The directory hierarchy looks like this:

/home/user/files
/home/user/files/version1
/home/user/files/version1/type1
/home/user/files/version1/type2
/home/user/files/version2
/home/user/files/version2/type1

and the list ends up looking like this:

['/home/user/files/version1/type1','/home/user/files/version1/type2','/home/user/files/version2/type1','/home/user/files/version2/type2']

the next thing I need to do is figure out how to update those.

the quick and dirty would be (as I'm imagining it at the moment):
for path in pathlist:
    chdir into path
    execute rsync or zsync

but that gets me moving into one dir, updating, then moving into another.

What I was wondering about though, is spawning off separate rsync
processes to run concurrently (each rsync will hit a different remote
dir for each local dir)

so I'm trying to figure out a good way to do this:

for path in pathlist:
    kick off an individual rsync|zsync process to update path

wait for all child processes to end
exit program.

I've been looking at subprocess because at the moment, that's all I
really know...
But is there a better way of kicking off multiple simultaneous
processes so I can update all dirs at once instead of one at a time?

No, this isn't homework, it's something I'm working on to sync a
couple directories of ISO images to grab nightly builds
Yes, there are plenty of pre-made scripts out there, but I don't want
to even look at those because I figured this would be a good learning
experience, and I want to try to solve this as much on my own as I can
without just cut and pasting from someone elses program.

So, with that said, any ideas on the best way to proceed?  I'm going
to start looking at ways to use subprocess to do this, or would there
be a better way (multi-threading maybe?)

Or am I even in the right ballpark?

Cheers
Jeff


From james.harris.1 at googlemail.com  Wed Mar 10 16:53:34 2010
From: james.harris.1 at googlemail.com (James Harris)
Date: Wed, 10 Mar 2010 13:53:34 -0800 (PST)
Subject: Named loops for breaking
References: <6d6a35e8-f09c-4792-8abe-5a0dc24d214e@g28g2000yqh.googlegroups.com>
	<mailman.529.1268202554.23598.python-list@python.org>
Message-ID: <c809ceee-34ff-409c-b645-3cb833ce6f8a@g19g2000yqe.googlegroups.com>

On 10 Mar, 06:29, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Tue, 09 Mar 2010 18:41:10 -0300, Daniel Klein <bri... at gmail.com> ?
> escribi :
>
> > Basically I'm wondering if there are any plans to implemented named
> > loops in Python, so I can tell a break command to break out of a
> > specific loop in the case of nested loops.
>
> See PEP3136 [1] and its rejection note [2]
> I think you may find some more discussion in the python-ideas list.
>
> > Currently I'm using boolean
> > flag variables, but I find that very clumsy. I know this idea of
> > breaking out of specific loops from javascript; I guess java does it
> > too. It just seems a very Pythonian idea to me: clear, promotes code
> > legibility, seems obvious.
>
> Although I've occasionally missed the feature myself, I agree with Guido's ?
> arguments against it.

I don't agree with Guido's second reason in particular. He writes in
the link Gabriel provided

  > [2]http://mail.python.org/pipermail/python-3000/2007-July/
008663.html

G> However, I'm rejecting it on the basis that code so complicated to
G> require this feature is very rare. In most cases there are existing
G> work-arounds that produce clean code, for example using 'return'.
G> While I'm sure there are some (rare) real cases where clarity of
the
G> code would suffer from a refactoring that makes it possible to use
G> return, this is offset by two issues:

G> 1. The complexity added to the language, permanently. This affects
not
G> only all Python implementations, but also every source analysis
tool,
G> plus of course all documentation for the language.

Guido may have a point here about source tools but I don't think the
language becomes more complex. If anything it would become more
orthogonal - i.e. fewer arbitrary restrictions. And documentation is
needed for any change so saying that documentation would need to be
updated is an odd reason to reject a change.

G> 2. My expectation that the feature will be abused more than it will
be
G> used right, leading to a net decrease in code clarity (measured
across
G> all Python code written henceforth). Lazy programmers are
everywhere,
G> and before you know it you have an incredible mess on your hands of
G> unintelligible code.

Breaking out of an inner loop is just as natural as breaking out of
the immediately enclosing loop. ISTM that if one is allowed the other
should be also.

> You have several alternatives: refactor the loop ?
> into an auxiliary function, use a specific exception, add boolean flags, ?
> or repeat the test at the outer levels. (I usually choose the first).

The auxiliary function idea (Guido's preference as well as Gabriel's)
works but it may require accessing of variables which don't appear in
the function interface, and the "return" in that function is no
different from the break dropping through multiple levels. Return does
exactly that (as well as setting a result value).

There are often times when it *is* better to factor out the code to a
different function but adding a function just to enable a break from
an inner loop doesn't seem to me a good reason.

James


From ldo at geek-central.gen.new_zealand  Wed Mar 10 16:56:19 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Thu, 11 Mar 2010 10:56:19 +1300
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<4b8b5cef$0$1625$742ec2ed@news.sonic.net>
Message-ID: <hn94i3$3me$5@lust.ihug.co.nz>

In message <4b8b5cef$0$1625$742ec2ed at news.sonic.net>, John Nagle wrote:

> Patrick Maupin wrote:
>> 
>> Finding .ini configuration files too limiting, JSON and XML to hard to
>> manually edit, and YAML too complex to parse quickly, I have started
>> work on a new configuration file parser.
> 
>     You're not supposed to edit those formats manually.

Strange. A previous client of mine was a totally non-IT-technical guy, yet I 
was able to set him up with editing XML files (needed to drive some software 
I wrote for him) just fine.

Of course he was using a purpose-built editor, namely KXMLEditor.


From ldo at geek-central.gen.new_zealand  Wed Mar 10 16:57:15 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Thu, 11 Mar 2010 10:57:15 +1300
Subject: Passing FILE * types using ctypes
References: <a83319d7-c199-4532-9816-d002f7fd7914@q16g2000yqq.googlegroups.com>
	<bac1318c-d5a2-4dfc-a716-2977959f7a06@b30g2000yqd.googlegroups.com>
	<7vbrveFegeU1@mid.individual.net>
Message-ID: <hn94jr$3me$6@lust.ihug.co.nz>

In message <7vbrveFegeU1 at mid.individual.net>, Gregory Ewing wrote:

> If you need the same FILE * that Python is using, you
> may need to use ctypes to extract it out of the file
> object.

Why would Python be using a FILE *?


From ldo at geek-central.gen.new_zealand  Wed Mar 10 16:58:30 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Thu, 11 Mar 2010 10:58:30 +1300
Subject: Passing FILE * types using ctypes
References: <a83319d7-c199-4532-9816-d002f7fd7914@q16g2000yqq.googlegroups.com>
Message-ID: <hn94m6$3me$7@lust.ihug.co.nz>

In message <a83319d7-c199-4532-9816-
d002f7fd7914 at q16g2000yqq.googlegroups.com>, Zeeshan Quireshi wrote:

> Hello, I'm using ctypes to wrap a library i wrote. I am trying to pass
> it a FILE *pointer ...

Another option is to fix your library not to use stdio directly.


From isso.moh at gmail.com  Wed Mar 10 17:03:50 2010
From: isso.moh at gmail.com (mohamed issolah)
Date: Wed, 10 Mar 2010 23:03:50 +0100
Subject: show image in python
Message-ID: <d698368f1003101403t519b5efdt94892902026aee0b@mail.gmail.com>

Hey, This is my program

 1 #!/usr/bin/python
  2 import PIL
  3 import numpy
  4 import Image
  5 import ImageOps
  6 import sys
  7
  8 def Matimg(path):
  9         """transforme image en matrice"""
 10         Img = Image.open(str(path))
 11         Img1 = ImageOps.grayscale(Img)
 12         largeur,hauteur = Img1.size
 13         imdata = Img1.getdata()
 14         tab = numpy.array(imdata)
 15         matrix = numpy.reshape(tab,(hauteur,largeur))
 16         return matrix
 17
 18 def Creeimg():
 19         """transforme matrice en image"""
 20         img = Image.new ("L",(8,8))
 21         matrix = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
 22         img.putdata(matrix)
 23         img.show()
 24         img.save(fp="./ana.bmp")
 25
 26 if  __name__== '__main__':
 27     if len(sys.argv) < 2 :
 28         print "Usage: img.py <image>"
 29         sys.exit(0)
 30     path = sys.argv[1]
 31     matrix = Matimg(path)
 32     print matrix
 33     Creeimg()

My probeleme : In line 23 "img.show()" Don't work, normally I show the image
but it's not work, but strangely in line 24 "img.save(fp="./ana.bmp")" it's
work
WHERE IS THE PROBLEME.

I have this error in shell : "(eog:3176): GLib-WARNING **: GError set over
the top of a previous GError or uninitialized memory.
This indicates a bug in someone's code. You must ensure an error is NULL
before it's set.
The overwriting error message was: Error in getting image file info "


os: ubuntu 9.10

sorry for my english. ;-)

-- 
issolah mohamed
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From dreadpiratejeff at gmail.com  Wed Mar 10 17:04:47 2010
From: dreadpiratejeff at gmail.com (J)
Date: Wed, 10 Mar 2010 17:04:47 -0500
Subject: Ideas for creating processes
In-Reply-To: <36dec4ff1003101352g7d159742j2a0c76a6b0cd23fb@mail.gmail.com>
References: <36dec4ff1003101352g7d159742j2a0c76a6b0cd23fb@mail.gmail.com>
Message-ID: <36dec4ff1003101404v402f0b59lf0ac67e4a9c8cc3c@mail.gmail.com>

On Wed, Mar 10, 2010 at 16:52, J <dreadpiratejeff at gmail.com> wrote:
> the quick and dirty would be (as I'm imagining it at the moment):
> for path in pathlist:
> ? ?chdir into path
> ? ?execute rsync or zsync
>
> but that gets me moving into one dir, updating, then moving into another.
>
> What I was wondering about though, is spawning off separate rsync
> processes to run concurrently (each rsync will hit a different remote
> dir for each local dir)
>
> so I'm trying to figure out a good way to do this:
>
> for path in pathlist:
> ? ?kick off an individual rsync|zsync process to update path

And now I'm looking at subprocess and I can set shell=True and it will
intrepret special characters like &

So could I do something like this:

for item in pathlist:
    subprocess.Popen('rsync command &', shell=True)

and simply wait unti they are all done?


From robert.kern at gmail.com  Wed Mar 10 17:05:45 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 10 Mar 2010 16:05:45 -0600
Subject: Knight's tour Warndorff's algorithm problem
In-Reply-To: <hn945v$3me$4@lust.ihug.co.nz>
References: <mailman.527.1268199449.23598.python-list@python.org>
	<hn945v$3me$4@lust.ihug.co.nz>
Message-ID: <hn953q$u1c$1@dough.gmane.org>

On 2010-03-10 15:49 PM, Lawrence D'Oliveiro wrote:
> In message<mailman.527.1268199449.23598.python-list at python.org>, Gabriel
> Genellina wrote:
>
>> Warnsdorff's algorithm is heuristic ...
>
> Then it shouldn?t be called an ?algorithm?.

There are lots of algorithms that use heuristics or are heuristics. The two are 
orthogonal concepts.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From robert.kern at gmail.com  Wed Mar 10 17:09:26 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 10 Mar 2010 16:09:26 -0600
Subject: Passing FILE * types using ctypes
In-Reply-To: <hn94jr$3me$6@lust.ihug.co.nz>
References: <a83319d7-c199-4532-9816-d002f7fd7914@q16g2000yqq.googlegroups.com>	<bac1318c-d5a2-4dfc-a716-2977959f7a06@b30g2000yqd.googlegroups.com>	<7vbrveFegeU1@mid.individual.net>
	<hn94jr$3me$6@lust.ihug.co.nz>
Message-ID: <hn95am$u1c$2@dough.gmane.org>

On 2010-03-10 15:57 PM, Lawrence D'Oliveiro wrote:
> In message<7vbrveFegeU1 at mid.individual.net>, Gregory Ewing wrote:
>
>> If you need the same FILE * that Python is using, you
>> may need to use ctypes to extract it out of the file
>> object.
>
> Why would Python be using a FILE *?

In Python 2.x, Python's file objects use a stdio FILE* pointer underneath. The 
I/O subsystem was rewritten in Python 3.x to use only file descriptors.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From invalid at invalid.invalid  Wed Mar 10 17:09:58 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Wed, 10 Mar 2010 22:09:58 +0000 (UTC)
Subject: Knight's tour Warndorff's algorithm problem
References: <mailman.527.1268199449.23598.python-list@python.org>
	<hn945v$3me$4@lust.ihug.co.nz>
Message-ID: <hn95bm$aql$1@reader1.panix.com>

On 2010-03-10, Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:
> In message <mailman.527.1268199449.23598.python-list at python.org>, Gabriel 
> Genellina wrote:
>
>> Warnsdorff's algorithm is heuristic ...
>
> Then it shouldn???t be called an ???algorithm???.

Why?  An algorithm is just a well-defined series of steps.

Just because it uses heuristics doesn't mean it's not an algorithm.
In my book it's still an algorithm even if it never produces a correct
result.  It's just not a very _good_ algorithm. :)

-- 
Grant Edwards               grant.b.edwards        Yow! YOU PICKED KARL
                                  at               MALDEN'S NOSE!!
                              gmail.com            


From xahlee at gmail.com  Wed Mar 10 17:36:58 2010
From: xahlee at gmail.com (Xah Lee)
Date: Wed, 10 Mar 2010 14:36:58 -0800 (PST)
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<4b90a1f8$0$1629$742ec2ed@news.sonic.net>
	<0d381135-730a-45e4-9225-9ba2a29b77fe@k2g2000pro.googlegroups.com>
	<Xns9D35C3BFCE829duncanbooth@127.0.0.1>
	<13c167f4-5e37-48a0-a480-3494c212035c@k5g2000pra.googlegroups.com>
	<Xns9D37B1793F70Aduncanbooth@127.0.0.1>
Message-ID: <06323935-e1a0-4447-b4d8-f62bf94dfb40@e19g2000prn.googlegroups.com>

On Mar 10, 9:26?am, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> No, I'm saying that if you plan to build a business that could grow you
> should be clear up front how you plan to handle the growth. It's too late
> if you suddenly discover your platform isn't scalable just when you need to
> scale it.

Right, but that doesn't seems to have any relevance about my point.
Many says that scalability is key to NoSQL, i pointed out that unless
you are like google, or ranked top 1000 in the world in terms data
size, the scalability reason isn't that strong.

Xah Lee wrote:

> many people mentioned scalibility... though i think it is fruitful to
> talk about at what size is the NoSQL databases offer better
> scalability than SQL databases.
>
> For example, consider, if you are within world's top 100th user of
> database in terms of database size, such as Google, then it may be
> that the off-the-shelf tools may be limiting. But how many users
> really have such massive size of data?  note that google's need for
> database today isn't just a seach engine.
>
> It's db size for google search is probably larger than all the rest of
> search engine company's sizes combined. Plus, there's youtube (vid
> hosting), gmail, google code (source code hosting), google blog, orkut
> (social networking), picasa (photo hosting), etc, each are all ranked
> within top 5 or so with respective competitors in terms of number of
> accounts... so, google's datasize is probably number one among the
> world's user of databases, probably double or triple than the second
> user with the most large datasize. At that point, it seems logical
> that they need their own db, relational or not.

  Xah
? http://xahlee.org/

?


From alfps at start.no  Wed Mar 10 17:53:09 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 10 Mar 2010 23:53:09 +0100
Subject: Named loops for breaking
In-Reply-To: <c809ceee-34ff-409c-b645-3cb833ce6f8a@g19g2000yqe.googlegroups.com>
References: <6d6a35e8-f09c-4792-8abe-5a0dc24d214e@g28g2000yqh.googlegroups.com>
	<mailman.529.1268202554.23598.python-list@python.org>
	<c809ceee-34ff-409c-b645-3cb833ce6f8a@g19g2000yqe.googlegroups.com>
Message-ID: <hn97sm$e8f$1@news.eternal-september.org>

* James Harris:
> On 10 Mar, 06:29, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
>> En Tue, 09 Mar 2010 18:41:10 -0300, Daniel Klein <bri... at gmail.com>  
>> escribi :
>>
>>> Basically I'm wondering if there are any plans to implemented named
>>> loops in Python, so I can tell a break command to break out of a
>>> specific loop in the case of nested loops.
>> See PEP3136 [1] and its rejection note [2]
>> I think you may find some more discussion in the python-ideas list.
>>
>>> Currently I'm using boolean
>>> flag variables, but I find that very clumsy. I know this idea of
>>> breaking out of specific loops from javascript; I guess java does it
>>> too. It just seems a very Pythonian idea to me: clear, promotes code
>>> legibility, seems obvious.
>> Although I've occasionally missed the feature myself, I agree with Guido's  
>> arguments against it.
> 
> I don't agree with Guido's second reason in particular. He writes in
> the link Gabriel provided
> 
>   > [2]http://mail.python.org/pipermail/python-3000/2007-July/
> 008663.html
> 
> G> However, I'm rejecting it on the basis that code so complicated to
> G> require this feature is very rare. In most cases there are existing
> G> work-arounds that produce clean code, for example using 'return'.
> G> While I'm sure there are some (rare) real cases where clarity of
> the
> G> code would suffer from a refactoring that makes it possible to use
> G> return, this is offset by two issues:
> 
> G> 1. The complexity added to the language, permanently. This affects
> not
> G> only all Python implementations, but also every source analysis
> tool,
> G> plus of course all documentation for the language.
> 
> Guido may have a point here about source tools but I don't think the
> language becomes more complex. If anything it would become more
> orthogonal - i.e. fewer arbitrary restrictions. And documentation is
> needed for any change so saying that documentation would need to be
> updated is an odd reason to reject a change.
> 
> G> 2. My expectation that the feature will be abused more than it will
> be
> G> used right, leading to a net decrease in code clarity (measured
> across
> G> all Python code written henceforth). Lazy programmers are
> everywhere,
> G> and before you know it you have an incredible mess on your hands of
> G> unintelligible code.
> 
> Breaking out of an inner loop is just as natural as breaking out of
> the immediately enclosing loop. ISTM that if one is allowed the other
> should be also.
> 
>> You have several alternatives: refactor the loop  
>> into an auxiliary function, use a specific exception, add boolean flags,  
>> or repeat the test at the outer levels. (I usually choose the first).
> 
> The auxiliary function idea (Guido's preference as well as Gabriel's)
> works but it may require accessing of variables which don't appear in
> the function interface, and the "return" in that function is no
> different from the break dropping through multiple levels. Return does
> exactly that (as well as setting a result value).
> 
> There are often times when it *is* better to factor out the code to a
> different function but adding a function just to enable a break from
> an inner loop doesn't seem to me a good reason.

Gabriel Genellina mentioned these alternatives: "refactor the loop into an 
auxiliary function, use a specific exception, add boolean flags, or repeat the 
test at the outer levels. (I usually choose the first)"

And I agree, but in Python there is at least one more very practical 
alternative, namely /flatting/ the nested loops, representing them as a single loop.

It can go like this  --  very artifical construed example:


<code>
from __future__ import print_function
try:
     range = xrange
except:
     pass

def inclusive_range( first, last ):
     return range( first, last + 1 )

def xy_range( x_range, y_range ):
     for x in x_range:
         for y in y_range:
             yield (x, y)

def main():
     needle = 42
     x_range = inclusive_range( 1, 10 )
     y_range = inclusive_range( 1, 10 )
     pos = None
     for (x, y) in xy_range( x_range, y_range ):
         if x*y == needle:
             pos = (x, y)
             break
     if pos is None:
         print( "Sorry, {0} not found.".format( needle ) )
     else:
         print( "{0} found at {1}.".format( needle, pos ) )

main()
</code>


Cheers & hth.,

- Alf

PS: Gabriel, if you read this and don't understand it (as you mentioned in 
another thread that you never understand my postings), please just ask!


From martin.hellwig at dcuktec.org  Wed Mar 10 17:55:25 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Wed, 10 Mar 2010 22:55:25 +0000
Subject: Ideas for creating processes
In-Reply-To: <mailman.577.1268257971.23598.python-list@python.org>
References: <mailman.577.1268257971.23598.python-list@python.org>
Message-ID: <hn980q$esb$1@news.eternal-september.org>

On 03/10/10 21:52, J wrote:
> I'm working on a project and thought I'd ask for a suggestion on how
> to proceed (I've got my own ideas, but I wanted to see if I was on the
> right track)
<cut subprocess idea>
Well I can't speak with authority but I would go into similar lines, 
especially since you want to call an external program in the end anyway. 
Otherwise threading might have been an option.

Just make sure that all subprocesses are exited nicely before you are on 
the end of your script ;-)

-- 
mph


From nyamatongwe+thunder at gmail.com  Wed Mar 10 18:01:05 2010
From: nyamatongwe+thunder at gmail.com (Neil Hodgson)
Date: Wed, 10 Mar 2010 23:01:05 GMT
Subject: file seek is slow
In-Reply-To: <d86f1068-8cd4-4489-af00-450d407baf41@g28g2000prb.googlegroups.com>
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>
	<daf5c75e-8139-4a4a-8c27-5cef00327bb1@o3g2000yqb.googlegroups.com>
	<d86f1068-8cd4-4489-af00-450d407baf41@g28g2000prb.googlegroups.com>
Message-ID: <RwVln.12295$pv.5770@news-server.bigpond.net.au>

Metalone:

> As it turns out each call is only
> 646 nanoseconds slower than 'C'.
> However, that is still 80% of the time to perform a file seek,
> which I would think is a relatively slow operation compared to just
> making a system call.

   A seek may not be doing much beyond setting a current offset value.
It is likely that fseek(f1, 0, SEEK_SET) isn't even doing a system call.

   An implementation of fseek will often return relatively quickly when
the position is within the current buffer -- from line 192 in
http://www.google.com/codesearch/p?hl=en#XAzRy8oK4zA/libc/stdio/fseek.c&q=fseek&sa=N&cd=1&ct=rc

   Neil


From python at mrabarnett.plus.com  Wed Mar 10 18:03:17 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 10 Mar 2010 23:03:17 +0000
Subject: Ideas for creating processes
In-Reply-To: <36dec4ff1003101352g7d159742j2a0c76a6b0cd23fb@mail.gmail.com>
References: <36dec4ff1003101352g7d159742j2a0c76a6b0cd23fb@mail.gmail.com>
Message-ID: <4B982535.4080000@mrabarnett.plus.com>

J wrote:
> I'm working on a project and thought I'd ask for a suggestion on how
> to proceed (I've got my own ideas, but I wanted to see if I was on the
> right track)
> 
> For now, I've got this:
> 
> def main():
> ## get our list of directories to refresh
>     releases=sys.argv[1:]
>     if len(releases) < 1:
>         print "You need to provide at least one dir to update"
>         sys.exit()
> 
>     ## Lets figure out what there is to update
>     updateDirs = []
>     for rel in releases:
>         currentDir = os.path.join(homedir, rel)
>         for item in os.listdir(currentDir):
>             updateDirs += [os.path.join(homedir, rel, item)]
> 
> which returns a list of full pathnames to directories that need to be
> updated (updates will be carried out by calling rsync or zsync
> eventually)
> 
> The directory hierarchy looks like this:
> 
> /home/user/files
> /home/user/files/version1
> /home/user/files/version1/type1
> /home/user/files/version1/type2
> /home/user/files/version2
> /home/user/files/version2/type1
> 
> and the list ends up looking like this:
> 
> ['/home/user/files/version1/type1','/home/user/files/version1/type2','/home/user/files/version2/type1','/home/user/files/version2/type2']
> 
> the next thing I need to do is figure out how to update those.
> 
> the quick and dirty would be (as I'm imagining it at the moment):
> for path in pathlist:
>     chdir into path
>     execute rsync or zsync
> 
> but that gets me moving into one dir, updating, then moving into another.
> 
> What I was wondering about though, is spawning off separate rsync
> processes to run concurrently (each rsync will hit a different remote
> dir for each local dir)
> 
> so I'm trying to figure out a good way to do this:
> 
> for path in pathlist:
>     kick off an individual rsync|zsync process to update path
> 
> wait for all child processes to end
> exit program.
> 
> I've been looking at subprocess because at the moment, that's all I
> really know...
> But is there a better way of kicking off multiple simultaneous
> processes so I can update all dirs at once instead of one at a time?
> 
> No, this isn't homework, it's something I'm working on to sync a
> couple directories of ISO images to grab nightly builds
> Yes, there are plenty of pre-made scripts out there, but I don't want
> to even look at those because I figured this would be a good learning
> experience, and I want to try to solve this as much on my own as I can
> without just cut and pasting from someone elses program.
> 
> So, with that said, any ideas on the best way to proceed?  I'm going
> to start looking at ways to use subprocess to do this, or would there
> be a better way (multi-threading maybe?)
> 
> Or am I even in the right ballpark?
> 
Are you sure that you would gain from doing more than one at a time?

The bottleneck will probably be the speed of your network connection,
and if that's working at its maximum speed with one sync then doing
several concurrently won't save any time. (The syncs will also be
completing for disk I/O.)

It might, however, save time if the remote server takes time to respond
to a sync and/or doesn't use your network connection at its maximum
speed (the server's connection will have its own limits, of course, and
might be talking to other computers at the same time).

You could increase the number of concurrent syncs until you find the
number that gives the best results.


From nilly16 at yahoo.com  Wed Mar 10 18:06:41 2010
From: nilly16 at yahoo.com (Jimbo)
Date: Wed, 10 Mar 2010 15:06:41 -0800 (PST)
Subject: Python Script to get Info from Site not working
Message-ID: <993c3089-0f96-4f37-b42a-111731045b2d@k24g2000pro.googlegroups.com>

Hello

I am asking what is probably a very easy thing to do but I cannot find
a tutorial on how to do it anywhere. [b]I want to use a Python script
to get information from a webpage. [/b]

I found a semi Python & internet tutorial here if anyone else would
like it http://www.upriss.org.uk/python/session6.html

I would like to create a python script that gets a value from a set of
radio buttons on a HTML page & tell me which one is selected.

I have 3 radio buttons: Tea, Coffee, Hot Chocolate & a Submit button

My script is meant to find which radio button is selected & tell me
that. But it just keeps saying "No Drink Selected!"

Can you help me figure out how to fix this. FYI: My Python script & my
HTML page are both saved in the same directory. And I made the webpage
using Notepad++, I open the webpage in Interent Explorer & I made the
Python Script in Idle.

Python Script:
[code]# Practice 9 CGI

######### don't change the following three lines: ###########
import cgi
print("Content-Type: text/html\n")
form = cgi.FieldStorage()

## add a form.getvalue for each of the names in your form: ##
drink = form.getvalue("drink")

########## start of HTML code ###########
print("""
<html>
<head> <title>What would you like to drink</title> </head>
<body>
<h4>Your drink: </h4><p>
""")
############ end of HTML code #############

if drink == "tea":
    print("You requested tea.")
elif drink == "coffee":
    print("You requested coffee.")
elif drink == "hot chocolate":
    print ("You requested hot chocolate.")
else:
    print ("You need to select a drink!")

########### start of HTML code ###########
print ("""
<p>Thank you for your visit. Please come again. <p>
</body></html>
""")
############# end of HTML code ##############
[/code]

HTML Code:
[code]<html>
<head>


</head>

<body>

<form action="practice9.py" method="post">

<input type="radio" name="drink" value="tea" checked > Tea <br>
<input type="radio" name="drink" value="coffee" > Coffee <br>
<input type="radio" name="drink" value="hot chocolate" > Hot Chocolate
<p>

<input type="submit" value="Place order">
</form>


</body>
</html>[/code]


From news1234 at free.fr  Wed Mar 10 18:17:19 2010
From: news1234 at free.fr (News123)
Date: Thu, 11 Mar 2010 00:17:19 +0100
Subject: Import problem
In-Reply-To: <mailman.542.1268224068.23598.python-list@python.org>
References: <6630f859-b85d-4841-b1d5-2a563dca9cbb@q15g2000yqj.googlegroups.com>	<mailman.460.1268053858.23598.python-list@python.org>	<4b957866$0$17135$426a34cc@news.free.fr>
	<mailman.542.1268224068.23598.python-list@python.org>
Message-ID: <4B98287F.2010101@free.fr>

Hi JM,

Jean-Michel Pichavant wrote:
> News123 wrote:
>> Jean-Michel Pichavant wrote:
>>  
>>> Johny wrote:
>>>    
>>>> I have this directory structure
>>>>
>>>> C:
>>>>       \A
>>>>          __init__.py
>>>>          amodule.py
>>>>
>>>>          \B
>>>>           __init__.py
>>>>           bmodule.py
>>>>
>>>>            \D
>>>>             __init__.py
>>>>             dmodule.py
>>>>
>>>> and  I want to import  bmodule.py
>>>> C:\>cd \
>>>>
>>>> C:\>python
>>>> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
>>>> (Intel)] on win
>>>> 32
>>>> Type "help", "copyright", "credits" or "license" for more information.
>>>>  
>>>>      
>>>>>>> from A.B import  bmodule
>>>>>>>                     
>>>> I am bmodule
>>>>   C:\>
>>>>
>>>> so far so good. Now I would like to import bmodule but if the current
>>>> directory is \D subdirectory.
>>>>
>>>> C:> cd \A\B\D
>>>> C:\A\B\D>
>>>> C:\A\B\D>python
>>>> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
>>>> (Intel)] on win
>>>> 32
>>>> Type "help", "copyright", "credits" or "license" for more information.
>>>>  
>>>>      
>>>>>>> import sys
>>>>>>> sys.path.append('C:\\A')
>>>>>>> from A.B import bmodule
>>>>>>>                     
>>>> Traceback (most recent call last):
>>>>   File "<stdin>", line 1, in <module>
>>>> ImportError: No module named A.B
>>>>
>>>> C:\>
>>>>
>>>> so I can not import a module from the parent directory? Or where did I
>>>> make an error?
>>>> Thanks for help
>>>>
>>>> L.
>>>>         
>>> try
>>>
>>> import sys
>>> sys.path.append('C:\\')
>>> from A.B import bmodule
>>>
>>>     
>> is there any 'automatic' way of finding the top level
>> directory?basically the 'top level directory is the first directory
>> going upwards, that doesn't contain a __init__.py file.
>>   
> what if some user has an __init__.py file the top level directory of
> your package ?

Is there any other usage of __init.py__ than indicating a module directory?
I wasn't aware of it, but you're right I did not investigte in depth and
users can of course do whatever they like.



>> of course you could do this 'manually' by
>> doing:
>>
>> # assume, that this module is A.amodule
>> import sys
>> import os
>>
>> # I'd love to have a similiar automatic construct
>> if __name__ == "__main__":
>>     level = 1 # or function locating how far to go up before
>>               # finding a dir, whcih does not contain a __init__.py
>>     mydir = os.path.split(__file__)[0]
>>     topdir = os.path.join( mydir,*(("..",)*level))
>>     abstop = os.path.abspath(topdir)
>>     sys.path.append(abstop)
>>
>> ## now you can import with the normal module paths
>>
>> import A.blo
>> print "and I found blo",dir(A.blo)
>>
>>   
> You don't want to do that and you don't need it neither. That's what the
> env variable PYTHONPATH is for. set it correctly, install your package
> inside and everything works just fine (+standard). With a linux OS it
> easy to create smb links to point to any working directory. It should be
> possible on windows as well.
I like your idea with the symlinks.
However not sure how to do it with windows.
I assume default shortcuts won't do.
> 
> If your package is meant to be destributed, you may use setup.py
> 
> 
Well,

It's nice if a user just unpacks a zip file and can click on any script
with the .py suffix in the tree.

(Its nice for example for tutorials / demos )

It's also nice if he can later on just delete the unpacked directory and
there will be no trace left in the registry or in the python base dir.

This is why I'm interested in solutions without setup.py or changing
environment variables.

bye


N






From news1234 at free.fr  Wed Mar 10 18:18:05 2010
From: news1234 at free.fr (News123)
Date: Thu, 11 Mar 2010 00:18:05 +0100
Subject: Import problem
In-Reply-To: <mailman.542.1268224068.23598.python-list@python.org>
References: <6630f859-b85d-4841-b1d5-2a563dca9cbb@q15g2000yqj.googlegroups.com>	<mailman.460.1268053858.23598.python-list@python.org>	<4b957866$0$17135$426a34cc@news.free.fr>
	<mailman.542.1268224068.23598.python-list@python.org>
Message-ID: <4b9828ad$0$698$426a74cc@news.free.fr>

Hi JM,

Jean-Michel Pichavant wrote:
> News123 wrote:
>> Jean-Michel Pichavant wrote:
>>  
>>> Johny wrote:
>>>    
>>>> I have this directory structure
>>>>
>>>> C:
>>>>       \A
>>>>          __init__.py
>>>>          amodule.py
>>>>
>>>>          \B
>>>>           __init__.py
>>>>           bmodule.py
>>>>
>>>>            \D
>>>>             __init__.py
>>>>             dmodule.py
>>>>
>>>> and  I want to import  bmodule.py
>>>> C:\>cd \
>>>>
>>>> C:\>python
>>>> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
>>>> (Intel)] on win
>>>> 32
>>>> Type "help", "copyright", "credits" or "license" for more information.
>>>>  
>>>>      
>>>>>>> from A.B import  bmodule
>>>>>>>                     
>>>> I am bmodule
>>>>   C:\>
>>>>
>>>> so far so good. Now I would like to import bmodule but if the current
>>>> directory is \D subdirectory.
>>>>
>>>> C:> cd \A\B\D
>>>> C:\A\B\D>
>>>> C:\A\B\D>python
>>>> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
>>>> (Intel)] on win
>>>> 32
>>>> Type "help", "copyright", "credits" or "license" for more information.
>>>>  
>>>>      
>>>>>>> import sys
>>>>>>> sys.path.append('C:\\A')
>>>>>>> from A.B import bmodule
>>>>>>>                     
>>>> Traceback (most recent call last):
>>>>   File "<stdin>", line 1, in <module>
>>>> ImportError: No module named A.B
>>>>
>>>> C:\>
>>>>
>>>> so I can not import a module from the parent directory? Or where did I
>>>> make an error?
>>>> Thanks for help
>>>>
>>>> L.
>>>>         
>>> try
>>>
>>> import sys
>>> sys.path.append('C:\\')
>>> from A.B import bmodule
>>>
>>>     
>> is there any 'automatic' way of finding the top level
>> directory?basically the 'top level directory is the first directory
>> going upwards, that doesn't contain a __init__.py file.
>>   
> what if some user has an __init__.py file the top level directory of
> your package ?

Is there any other usage of __init.py__ than indicating a module directory?
I wasn't aware of it, but you're right I did not investigte in depth and
users can of course do whatever they like.



>> of course you could do this 'manually' by
>> doing:
>>
>> # assume, that this module is A.amodule
>> import sys
>> import os
>>
>> # I'd love to have a similiar automatic construct
>> if __name__ == "__main__":
>>     level = 1 # or function locating how far to go up before
>>               # finding a dir, whcih does not contain a __init__.py
>>     mydir = os.path.split(__file__)[0]
>>     topdir = os.path.join( mydir,*(("..",)*level))
>>     abstop = os.path.abspath(topdir)
>>     sys.path.append(abstop)
>>
>> ## now you can import with the normal module paths
>>
>> import A.blo
>> print "and I found blo",dir(A.blo)
>>
>>   
> You don't want to do that and you don't need it neither. That's what the
> env variable PYTHONPATH is for. set it correctly, install your package
> inside and everything works just fine (+standard). With a linux OS it
> easy to create smb links to point to any working directory. It should be
> possible on windows as well.
I like your idea with the symlinks.
However not sure how to do it with windows.
I assume default shortcuts won't do.
> 
> If your package is meant to be destributed, you may use setup.py
> 
> 
Well,

It's nice if a user just unpacks a zip file and can click on any script
with the .py suffix in the tree.

(Its nice for example for tutorials / demos )

It's also nice if he can later on just delete the unpacked directory and
there will be no trace left in the registry or in the python base dir.

This is why I'm interested in solutions without setup.py or changing
environment variables.

bye


N






From ndbecker2 at gmail.com  Wed Mar 10 18:38:10 2010
From: ndbecker2 at gmail.com (Neal Becker)
Date: Wed, 10 Mar 2010 18:38:10 -0500
Subject: Can't define __call__ within __init__?
References: <hn85re$vj9$1@dough.gmane.org>
	<8c7f10c61003100527o7c7f9375ie662ce67ab78f1de@mail.gmail.com>
	<mailman.549.1268228501.23598.python-list@python.org>
	<Xns9D37B39F7893Bduncanbooth@127.0.0.1>
	<hn8o26$aik$1@dough.gmane.org> <hn8u86$2r0$2@dough.gmane.org>
Message-ID: <hn9ah2$gef$2@dough.gmane.org>

Robert Kern wrote:

> On 2010-03-10 12:23 PM, Neal Becker wrote:
>> Duncan Booth wrote:
>> ...
>>>
>>> P.S. I don't know what you did in your post but your Followup-To header
>>> is pointing to a group on gmane which makes extra work for me replying.
>>> Please don't do that.
>>
>> I'm sorry about that, there is some bad interaction between gmane's nntp-
>> smtp gateway and python's mail list.  I don't know what to do about it. 
>> I think the problem only happens on python's mail list (I've never seen
>> it reported on any of the MANY other lists I use via gmane).
> 
> I think it may be your news reader adding the Original-Followup-To header.
> I use Thunderbird 3 to read this list via GMane, too, but my posts do not
> contain the header. What newsreader are you using?
> 

knode.



From sjdevnull at yahoo.com  Wed Mar 10 18:38:28 2010
From: sjdevnull at yahoo.com (sjdevnull at yahoo.com)
Date: Wed, 10 Mar 2010 15:38:28 -0800 (PST)
Subject: file seek is slow
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>
	<daf5c75e-8139-4a4a-8c27-5cef00327bb1@o3g2000yqb.googlegroups.com> 
	<d86f1068-8cd4-4489-af00-450d407baf41@g28g2000prb.googlegroups.com> 
	<RwVln.12295$pv.5770@news-server.bigpond.net.au>
Message-ID: <e8a9a95f-77b3-43ce-8110-8c6babaa6f26@z4g2000yqa.googlegroups.com>

On Mar 10, 6:01?pm, Neil Hodgson <nyamatongwe+thun... at gmail.com>
wrote:
> Metalone:
>
> > As it turns out each call is only
> > 646 nanoseconds slower than 'C'.
> > However, that is still 80% of the time to perform a file seek,
> > which I would think is a relatively slow operation compared to just
> > making a system call.
>
> ? ?A seek may not be doing much beyond setting a current offset value.
> It is likely that fseek(f1, 0, SEEK_SET) isn't even doing a system call.

Exactly.  If I replace both calls to fseek with gettimeofday (aka
time.time() on my platform in python) I get fairly close results:
$ ./testseek
4.120
$ python2.5 testseek.py
4.170
$ ./testseek
4.080
$ python2.5 testseek.py
4.130


FWIW, my results with fseek aren't as bad as those of the OP.  This is
python2.5 on a 2.6.9 Linux OS, with psyco:
$ ./testseek
0.560
$ python2.5 testseek.py
0.750
$ ./testseek
0.570
$ python2.5 testseek.py
0.760


From rbrt.somerville at gmail.com  Wed Mar 10 18:48:14 2010
From: rbrt.somerville at gmail.com (robert somerville)
Date: Wed, 10 Mar 2010 15:48:14 -0800
Subject: Elementtree install problem in Ubuntu (a newbie ..)
Message-ID: <2fb4a5011003101548x862eef2w4f46473bae4bf9f4@mail.gmail.com>

Hi ;
I installed the elementtree and celementree packages throught the synaptic
package manager, all seems to go fine through the install ...

when i startup python and try to import them (as per the EFFBOTT.org
suggestions) .. PROBLEMS ... (see below ..) What am i doing wrong ??? this
is a new window after installation of packages ...

Python 2.6.4 (r264:75706, Dec  7 2009, 18:43:55)
[GCC 4.4.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import elementtree.ElementTree as ET
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named elementtree.ElementTree
>>> import elementtree
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named elementtree


thanks;
Robert somerville
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From philip at semanchuk.com  Wed Mar 10 18:56:08 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Wed, 10 Mar 2010 18:56:08 -0500
Subject: Elementtree install problem in Ubuntu (a newbie ..)
In-Reply-To: <2fb4a5011003101548x862eef2w4f46473bae4bf9f4@mail.gmail.com>
References: <2fb4a5011003101548x862eef2w4f46473bae4bf9f4@mail.gmail.com>
Message-ID: <C95A373F-79E0-4865-BF6E-81CC3ACBDC36@semanchuk.com>


On Mar 10, 2010, at 6:48 PM, robert somerville wrote:

> Hi ;
> I installed the elementtree and celementree packages throught the  
> synaptic
> package manager, all seems to go fine through the install ...
>
> when i startup python and try to import them (as per the EFFBOTT.org
> suggestions) .. PROBLEMS ... (see below ..) What am i doing  
> wrong ??? this
> is a new window after installation of packages ...
>
> Python 2.6.4 (r264:75706, Dec  7 2009, 18:43:55)
> [GCC 4.4.1] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import elementtree.ElementTree as ET
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
> ImportError: No module named elementtree.ElementTree
>>>> import elementtree
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
> ImportError: No module named elementtree

Hi Robert,
In Python >= 2.5, ElementTree is part the standard library so it  
doesn't need to be installed separately. Here's the documentation for  
it:
http://www.python.org/doc/2.6.4/library/xml.etree.elementtree.html


HTH
Philip


From genetiq at gmail.com  Wed Mar 10 19:05:13 2010
From: genetiq at gmail.com (phantasm)
Date: Wed, 10 Mar 2010 16:05:13 -0800 (PST)
Subject: Can't install PIL on MacOS X Leopard
Message-ID: <94070db2-91f0-47a8-a259-36378aab95ea@o3g2000yqb.googlegroups.com>

Hello!

I'm trying to install PIL module on MacOS X Leopard with python 2.6.
Everything seemed to be fine - now I have PIL egg package in "site-
packages" directory, but when I'm trying "import PIL", I get an error
"ImportError: No module named PIL".

All other modules such as SQL Alchemy work fine. Their EGGs reside in
a same directory as a resulting PIL package.

I've tried to install either via easy_install and manually, results
are the same. PYTHONPATH environment variable is set to a correct
directory. python command "import _imaging" returns no error.

What I'm doing wrong?


From rbrt.somerville at gmail.com  Wed Mar 10 19:17:29 2010
From: rbrt.somerville at gmail.com (robert somerville)
Date: Wed, 10 Mar 2010 16:17:29 -0800
Subject: Python 2.6 and modules dbi AND odbc
Message-ID: <2fb4a5011003101617r5518b322y6ccc091046b0ccc4@mail.gmail.com>

hi;
 i am trying to get some legacy python code (which i no nothing about)
working with tries to import dbi and odbc (the import fails ...) it looks
like these modules are deprecated ?? if so is there a work around , if not
deprecated, what am i doing wrong ?? i see no Ubuntu packages that look
promising ..

Robert Somerville
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From nad at acm.org  Wed Mar 10 19:34:51 2010
From: nad at acm.org (Ned Deily)
Date: Wed, 10 Mar 2010 16:34:51 -0800
Subject: Can't install PIL on MacOS X Leopard
References: <94070db2-91f0-47a8-a259-36378aab95ea@o3g2000yqb.googlegroups.com>
Message-ID: <nad-E0CB2A.16345110032010@dough.gmane.org>

In article 
<94070db2-91f0-47a8-a259-36378aab95ea at o3g2000yqb.googlegroups.com>,
 phantasm <genetiq at gmail.com> wrote:
> I'm trying to install PIL module on MacOS X Leopard with python 2.6.
> Everything seemed to be fine - now I have PIL egg package in "site-
> packages" directory, but when I'm trying "import PIL", I get an error
> "ImportError: No module named PIL".
> 
> All other modules such as SQL Alchemy work fine. Their EGGs reside in
> a same directory as a resulting PIL package.
> 
> I've tried to install either via easy_install and manually, results
> are the same. PYTHONPATH environment variable is set to a correct
> directory. python command "import _imaging" returns no error.
> 
> What I'm doing wrong?

Hard to say without more information but it does seem odd that _imaging 
can be imported.  One thing to try:

$ python2.6
Python 2.6.4 (r264:75706, Oct 28 2009, 20:34:51) 
[GCC 4.0.1 (Apple Inc. build 5493)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import _imaging
>>> _imaging.__file__
'/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-pac
kages/PIL/_imaging.so'
# or something like that

Make sure the file is located within the expected PIL directory.  Also 
make sure there aren't any file permission problems on any of the PIL 
directories and files.  I'm assuming PIL was installed as an unzipped 
egg.  And double-check the contents of any .pth files.

-- 
 Ned Deily,
 nad at acm.org



From genetiq at gmail.com  Wed Mar 10 19:43:26 2010
From: genetiq at gmail.com (phantasm)
Date: Wed, 10 Mar 2010 16:43:26 -0800 (PST)
Subject: Can't install PIL on MacOS X Leopard
References: <94070db2-91f0-47a8-a259-36378aab95ea@o3g2000yqb.googlegroups.com>
	<mailman.587.1268267720.23598.python-list@python.org>
Message-ID: <a9ae54cc-b4d2-467f-835b-f473adb26234@o3g2000yqb.googlegroups.com>

Thank you for your reply, Ned, but I just tried to install it again
and found out that I didn't finally run "python setup.py install"
after building PIL manually. It solved the problem.


From gagsl-py2 at yahoo.com.ar  Wed Mar 10 20:37:01 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 10 Mar 2010 22:37:01 -0300
Subject: Does this already exists?: A module that checks if the used
	platform is supported
References: <hn88ag$b5m$1@news.eternal-september.org>
Message-ID: <op.u9dqrznnx6zn5v@lepton.softlabbsas.com.ar>

En Wed, 10 Mar 2010 10:54:27 -0300, Martin P. Hellwig
<martin.hellwig at dcuktec.org> escribi?:

> Before I start reinventing a squared wheel, I have the following  
> question:
> Is there already a (standard) module that wraps around the various  
> os/sys information which checks if the platform + version is supported  
> for what I want to do with it.

In case you were not aware of it: see the platform module. But you'll have
to do the checks yourself (based on the info it returns).

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Wed Mar 10 20:37:08 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 10 Mar 2010 22:37:08 -0300
Subject: Importing Modules
References: <676034.43316.qm@web30001.mail.mud.yahoo.com>
Message-ID: <op.u9dqr6b1x6zn5v@lepton.softlabbsas.com.ar>

En Wed, 10 Mar 2010 09:19:29 -0300, PEYMAN ASKARI <paskari007 at yahoo.ca>
escribi?:

> I wanted to know if imported classes are treated differently than  
> internal classes.

If by 'internal classes' you mean 'classes defined in the main module',
no, they're absolutely the same.

> class A():
>  __init__(self):
>   pass
>
> and call A, or A() I get something to the effect of  <__main__.A  
> instance at 0xb7f088ac>
>
> but if I call from module_name import A and then call A or A() I get  
> something to the effect of  <module_4.module_4 instance at 0xb7f0882c>

Note that both reprs have the same structure. Both say
<modulename.classname instance at ...>
When you execute `python test_import.py`, the code is executed into a
newly created module called __main__ (not test_import). So __main__ is the
name of the main module, and __main__.A is the full name of the A class
defined in the __main__ module.
In the other case, module_4.module_4 is the full name of the module_4
class defined in the module_4 module.

> I was wondering if this would be a problem.

In general, no, you shouldn't care. There is a problem, though, if some
other module imports the main one (using `import test_import`). Python
knows the main one as "__main__", not as "test_import", so it will load it
*again*, and you'll end with two separate copies of the same module.
Solution: don't do that :) -- redesign your application so subordinate
modules don't have to import the main one (move the required parts into a
third module).

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Wed Mar 10 20:37:14 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 10 Mar 2010 22:37:14 -0300
Subject: Interacting With Another Script
References: <4dc0cfea1003100432h2495ede1vf5e5bd75172ab5ea@mail.gmail.com>
Message-ID: <op.u9dqscw0x6zn5v@lepton.softlabbsas.com.ar>

En Wed, 10 Mar 2010 09:32:15 -0300, Victor Subervi
<victorsubervi at gmail.com> escribi?:

> There's a program (vpopmail) that has commands which, when called,  
> request
> input ("email address", "password", etc.) from the command line. I would
> like to build a TTW interface for my clients to use that interacts with
> these commands.

I know nothing about vpopmail, but can't you provide all the required
information by some other means? Command line arguments, a configuration
file, perhaps there is an API to call some internal functions? Faking an
interactive session would be my last option.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Wed Mar 10 20:37:18 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 10 Mar 2010 22:37:18 -0300
Subject: Method / Functions - What are the differences?
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
	<mailman.109.1267539415.23598.python-list@python.org>
	<hmk1mn$70u$1@newsreader3.netcologne.de>
	<4b8e4041$0$17447$426a34cc@news.free.fr> <hmlte9$d0f$1@dough.gmane.org>
	<mailman.205.1267633968.23598.python-list@python.org>
	<4b8e9660$0$21812$426a34cc@news.free.fr>
	<hmmrh4$644$1@newsreader3.netcologne.de> <4B8EF717.3070701@optimum.net>
	<4b902338$0$31260$607ed4bc@cv.net>
	<4b90f5eb$0$9148$426a74cc@news.free.fr>
	<4b911ee0$0$4988$607ed4bc@cv.net> <4B97B092.4060901@optimum.net>
Message-ID: <op.u9dqsgf1x6zn5v@lepton.softlabbsas.com.ar>

En Wed, 10 Mar 2010 11:45:38 -0300, John Posner <jjposner at optimum.net>
escribi?:

> As I promised/threatened, here's the *start* of a write-up on  
> properties, aimed at non-advanced Python programmers:
>
>    http://www.jjposner.net/media/python-properties-0310.pdf

I'd use 'function' instead of 'procedure', as this last word is very
uncommon in Python literature (also, "the procedure's return value..." may
look very strange to some people).

I'm unsure if one should make a distinction 'storage attribute' vs.
'method attribute', or even if it makes things actually more clear. I
think you could present the motivating idea first ("I want to execute some
code when accessing an attribute") and only later talk about properties
and descriptors (as written, the reader still doesn't know how to define a
simple property and you've already talked about deleting attributes...)

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Wed Mar 10 20:38:09 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 10 Mar 2010 22:38:09 -0300
Subject: Python Script to get Info from Site not working
References: <993c3089-0f96-4f37-b42a-111731045b2d@k24g2000pro.googlegroups.com>
Message-ID: <op.u9dqtv2hx6zn5v@lepton.softlabbsas.com.ar>

En Wed, 10 Mar 2010 20:06:41 -0300, Jimbo <nilly16 at yahoo.com> escribi?:

> I found a semi Python & internet tutorial here if anyone else would
> like it http://www.upriss.org.uk/python/session6.html
>
> My script is meant to find which radio button is selected & tell me
> that. But it just keeps saying "No Drink Selected!"

Are you sure? From the code you posted, the message should read "You need  
to select a drink!", not that one.

> if drink == "tea":
>     print("You requested tea.")
> elif drink == "coffee":
>     print("You requested coffee.")
> elif drink == "hot chocolate":
>     print ("You requested hot chocolate.")
> else:
>     print ("You need to select a drink!")

Replace the last line with something like this, to see what you are  
getting exactly:

        print("Sorry, no %r (%r) available." % (
           drink,
           cgi.escape(repr(type(drink)))))

BTW, which Python version are you using? The tutorial you linked to is  
aimed at Python 2.x, but your print syntax suggests you're using Python 3.x

-- 
Gabriel Genellina



From wuwei23 at gmail.com  Wed Mar 10 21:16:04 2010
From: wuwei23 at gmail.com (alex23)
Date: Wed, 10 Mar 2010 18:16:04 -0800 (PST)
Subject: Interacting With Another Script
References: <4dc0cfea1003100432h2495ede1vf5e5bd75172ab5ea@mail.gmail.com> 
	<mailman.559.1268238673.23598.python-list@python.org>
Message-ID: <2db4409d-d8d7-4af9-a9a7-e8071bc30b0f@o16g2000prh.googlegroups.com>

Victor Subervi <victorsube... at gmail.com> wrote:
> > There's a program (vpopmail) that has commands which, when called, request
> > input ("email address", "password", etc.) from the command line. I would
> > like to build a TTW interface for my clients to use that interacts with
> > these commands.

The Pexpect[1] module is pretty much aimed at doing exactly this.

1: http://www.noah.org/wiki/Pexpect



From nilly16 at yahoo.com  Wed Mar 10 21:26:05 2010
From: nilly16 at yahoo.com (Jimbo)
Date: Wed, 10 Mar 2010 18:26:05 -0800 (PST)
Subject: Python Script to get Info from Site not working
References: <993c3089-0f96-4f37-b42a-111731045b2d@k24g2000pro.googlegroups.com>
	<mailman.592.1268273109.23598.python-list@python.org>
Message-ID: <396ffb5b-8548-4e4d-8245-a53ecb3cff23@k24g2000pro.googlegroups.com>

On Mar 11, 12:38?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Wed, 10 Mar 2010 20:06:41 -0300, Jimbo <nill... at yahoo.com> escribi?:
>
> > I found a semi Python & internet tutorial here if anyone else would
> > like ithttp://www.upriss.org.uk/python/session6.html
>
> > My script is meant to find which radio button is selected & tell me
> > that. But it just keeps saying "No Drink Selected!"
>
> Are you sure? From the code you posted, the message should read "You need ?
> to select a drink!", not that one.

> Replace the last line with something like this, to see what you are ?
> getting exactly:
>
> ? ? ? ? print("Sorry, no %r (%r) available." % (
> ? ? ? ? ? ?drink,
> ? ? ? ? ? ?cgi.escape(repr(type(drink)))))
>
> BTW, which Python version are you using? The tutorial you linked to is ?
> aimed at Python 2.x, but your print syntax suggests you're using Python 3.x
>
> --
> Gabriel Genellina

Yeah that("You need to select a drink!") was the string I was getting
but I should be getting hot chocolate or something else(which ever one
I have selected)

I am using 3.x, do you think I should be using something else? Also
the your code I put in does the some thing, just now it says "Sorry no
none drink available" all the time.


From dreadpiratejeff at gmail.com  Wed Mar 10 21:52:19 2010
From: dreadpiratejeff at gmail.com (J)
Date: Wed, 10 Mar 2010 21:52:19 -0500
Subject: Ideas for creating processes
In-Reply-To: <4B982535.4080000@mrabarnett.plus.com>
References: <36dec4ff1003101352g7d159742j2a0c76a6b0cd23fb@mail.gmail.com> 
	<4B982535.4080000@mrabarnett.plus.com>
Message-ID: <36dec4ff1003101852x1b997d5bg68be4168ce01ce34@mail.gmail.com>

On Wed, Mar 10, 2010 at 18:03, MRAB <python at mrabarnett.plus.com> wrote:
> Are you sure that you would gain from doing more than one at a time?
>
> The bottleneck will probably be the speed of your network connection,
> and if that's working at its maximum speed with one sync then doing
> several concurrently won't save any time. (The syncs will also be
> completing for disk I/O.)

Good point MRAB... thanks for making it.

I started to wonder the same thing, but it took me a couple hours away
from working on it and a good dinner before I saw that...

Yeah, looking at it freshly now, I agree, I think I probably would be
better off running them one at a time.

The goal is to update several directories of ISO images with nightly
builds.  I can use rsync and only download images that are changed, or
I can use zsync and only download diffs (I believe that's how it
works) which is faster anyway.

The only reason I was considering doing them all simultaneously, or in
batches at least, is that I have to update 10 - 12 ISOs daily... BUT,
now that I look at it from your perspective, yeah, it would probably
be faster overall to do them one at a time instead because of the
bottleneck.

Thanks!  That helped a lot (and probably saved me a lot of headache
later on) :-)

Cheers
Jeff


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 10 22:18:47 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 11 Mar 2010 03:18:47 GMT
Subject: Can't define __call__ within __init__?
References: <mailman.544.1268226754.23598.python-list@python.org>
Message-ID: <pan.2010.03.11.03.18.47@REMOVE.THIS.cybersource.com.au>

On Wed, 10 Mar 2010 08:12:14 -0500, Neal Becker wrote:

> Want to switch __call__ behavior.  Why doesn't this work?  What is the
> correct way to write this?
> 
> class X (object):
>     def __init__(self, i):
>         if i == 0:
>             def __call__ (self):
>                 return 0
>         else:
>             def __call_ (self):
>                 return 1


Others have already pointed out that there are two reasons that won't 
work: 

(1) you define __call__ as a local variable of the __init__ method which 
then disappears as soon as the __init__ method completes; and

(2) special methods like __call__ are only called on the class, not the 
instance, so you can't give each instance its own method.


Perhaps the best way to solve this is to use delegation:


def zero_returner():
    return 0

def one_returner():
    return 1


class X (object):
    def __init__(self, i):
        if i == 0:
            self.func = zero_returner
        else:
            self.func = one_returner
    def __call__(self, *args, **kwargs):
        return self.func(*args, **kwargs)


zero_returner and one_returner can be any callable object, not 
necessarily a function.

Of course, all this assumes that your solution isn't even simpler:

class X (object):
    def __init__(self, i):
        self.i = i
    def __call__(self):
        return self.i

but I assume if it was that simple, you would have done that already.



-- 
Steven


From tjreedy at udel.edu  Wed Mar 10 23:44:49 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 10 Mar 2010 23:44:49 -0500
Subject: Knight's tour Warndorff's algorithm problem
In-Reply-To: <hn945v$3me$4@lust.ihug.co.nz>
References: <mailman.527.1268199449.23598.python-list@python.org>
	<hn945v$3me$4@lust.ihug.co.nz>
Message-ID: <hn9sg1$qha$1@dough.gmane.org>

On 3/10/2010 4:49 PM, Lawrence D'Oliveiro wrote:
> In message<mailman.527.1268199449.23598.python-list at python.org>, Gabriel
> Genellina wrote:
>
>> Warnsdorff's algorithm is heuristic ...
>
> Then it shouldn?t be called an ?algorithm?.

Heuristic algorithms correctly compute some function, just not the one 
you want ;-).




From radhakrishna12 at gmail.com  Wed Mar 10 23:47:30 2010
From: radhakrishna12 at gmail.com (Radhakrishna Bhat)
Date: Thu, 11 Mar 2010 10:17:30 +0530
Subject: Get a method instance through 'getattr' but not superclass's method
Message-ID: <e28756ee1003102047i2f60dbbev708e1cfa7a240f7f@mail.gmail.com>

I am using getattr to get a method instance from a class. But it also
returns methods from the superclass. How to detect if an attribute is from
superclass?


-Radhakrishna
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From efiish at gmail.com  Wed Mar 10 23:56:48 2010
From: efiish at gmail.com (Lan Qing)
Date: Thu, 11 Mar 2010 12:56:48 +0800
Subject: a newbie's question
In-Reply-To: <8c7f10c61003090600u692bfd8sdc287a73425ed47e@mail.gmail.com>
References: <ee9ad2071003090551v5def00c6jd04eef99f4545d20@mail.gmail.com>
	<8c7f10c61003090600u692bfd8sdc287a73425ed47e@mail.gmail.com>
Message-ID: <ee9ad2071003102056m1e0587f7wcaf249d01bc22cc5@mail.gmail.com>

hi Cheers,
     Think you, that helps me a lot.

On Tue, Mar 9, 2010 at 10:00 PM, Simon Brunning <simon at brunningonline.net>wrote:

> On 9 March 2010 13:51, Lan Qing <efiish at gmail.com> wrote:
> > Hi all,
> >       I'm a newbie of python programming language.
>
> Welcome!
>
> > I have used c/c++ for 5
> > years, and one year experience in Lua programming language. Can any one
> give
> > me some advice on learning python. Think you for any help!!
>
> You'll find some useful starting points here -
> <http://wiki.python.org/moin/BeginnersGuide/Programmers>.
>
> --
> Cheers,
> Simon B.
>
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From anand.shashwat at gmail.com  Thu Mar 11 00:28:01 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Thu, 11 Mar 2010 10:58:01 +0530
Subject: a newbie's question
In-Reply-To: <ee9ad2071003102056m1e0587f7wcaf249d01bc22cc5@mail.gmail.com>
References: <ee9ad2071003090551v5def00c6jd04eef99f4545d20@mail.gmail.com> 
	<8c7f10c61003090600u692bfd8sdc287a73425ed47e@mail.gmail.com> 
	<ee9ad2071003102056m1e0587f7wcaf249d01bc22cc5@mail.gmail.com>
Message-ID: <d4ab53de1003102128pb41ae35h432b344d2628c58e@mail.gmail.com>

Python is one language which is quite easy to get grasp of. one week and
you'll start doing productive stuff. Best of luck on your quest.

On Thu, Mar 11, 2010 at 10:26 AM, Lan Qing <efiish at gmail.com> wrote:

> hi Cheers,
>      Think you, that helps me a lot.
>
>
> On Tue, Mar 9, 2010 at 10:00 PM, Simon Brunning <simon at brunningonline.net>wrote:
>
>> On 9 March 2010 13:51, Lan Qing <efiish at gmail.com> wrote:
>> > Hi all,
>> >       I'm a newbie of python programming language.
>>
>> Welcome!
>>
>> > I have used c/c++ for 5
>> > years, and one year experience in Lua programming language. Can any one
>> give
>> > me some advice on learning python. Think you for any help!!
>>
>> You'll find some useful starting points here -
>> <http://wiki.python.org/moin/BeginnersGuide/Programmers>.
>>
>> --
>> Cheers,
>> Simon B.
>>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From sivaits4u at gmail.com  Thu Mar 11 00:40:14 2010
From: sivaits4u at gmail.com (Bujji)
Date: Thu, 11 Mar 2010 11:10:14 +0530
Subject: use of multiple versions of python
Message-ID: <581ce2791003102140t7fd470e5obcad20ec714f60f3@mail.gmail.com>

hi all,
I have installed python 2.6 in addition to python 2.5 in my system
Now for some modules(while installing ) it needs to use python 2.6
how can i do that
in case of easy_install what should i do to it to use python 2.6

from my understanding /usr/bin/python is the one which will be taking care
of version. but with this only one version of python can run even though we
have tow versions.

please post some solution for my problem.
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From lacrima.maxim at gmail.com  Thu Mar 11 00:48:45 2010
From: lacrima.maxim at gmail.com (Lacrima)
Date: Wed, 10 Mar 2010 21:48:45 -0800 (PST)
Subject: Can't install ssl for Python2.5
References: <3c0d84fc-1975-4937-9b65-88535e699999@u9g2000yqb.googlegroups.com>
	<hn92kq$fgb$1@online.de>
Message-ID: <b50979f7-94aa-4db1-b3e2-6b36522293c9@a18g2000yqc.googlegroups.com>

On Mar 10, 11:23?pm, "Martin v. Loewis" <mar... at v.loewis.de> wrote:
> > I don't know how to solve this problem and I am looking forward for
> > help.
>
> Try running "python setup.py install" directly, after downloading and
> unpacking the package.
>
> Regards,
> Martin

Thanks a lot! It helped!


From richardbp at gmail.com  Thu Mar 11 01:22:56 2010
From: richardbp at gmail.com (Richard)
Date: Wed, 10 Mar 2010 22:22:56 -0800 (PST)
Subject: os.rename [Errno 31] Too many links
References: <253f4908-1cb9-4165-bf01-1d89b39d3b35@k6g2000prg.googlegroups.com>
	<7vpugdF5bqU1@mid.individual.net>
Message-ID: <1082952b-5dc0-4efa-b47f-9ada9aa7980f@x23g2000prd.googlegroups.com>

On Mar 11, 3:08?am, Thomas Guettler <h... at tbz-pariv.de> wrote:
> Richard wrote:
> > I want to atomically write to a file so have been using temporary
> > files and renaming:
>
> > temp = tempfile.NamedTemporaryFile(delete=False)
> > temp.file.write(data)
> > temp.file.close()
> > os.rename(temp.name, output_file)
>
> > This worked but after 39567 files os.rename raises an OSError: [Errno
> > 31] Too many links
>
> > I can still create files in this directory so I doubt it is a platform
> > limitation.
> > Can you tell what is wrong? Am I not freeing the temporary file
> > resources properly?
>
> If you are on linux you can have a look at the open file descriptors of
> a running process like this:
>
> ls -l /proc/PID/fd/
>
> But I guess it is a limitation of your filesystem. What do you use?
>
> I once had this problem with ext2. It has a low limit for
> subdirectories.
>
> With xfs the limits are much greater.
>
> ? Thomas
>
> --
> Thomas Guettler,http://www.thomas-guettler.de/
> E-Mail: guettli (*) thomas-guettler + de


I am using Ubuntu 9.10 with ext3, which I believe has a limit for the
number of subdirectories but not files.

Thanks for the open file descriptor tip - I will check that out.

Richard


From stefan_ml at behnel.de  Thu Mar 11 02:53:51 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Thu, 11 Mar 2010 08:53:51 +0100
Subject: Anything like "Effective Java" for Python?
In-Reply-To: <4B97CCDF.7070802@simplistix.co.uk>
References: <hn8d98$m0d$1@reader1.panix.com>
	<4B97CCDF.7070802@simplistix.co.uk>
Message-ID: <hna7ig$lq2$1@dough.gmane.org>

Chris Withers, 10.03.2010 17:46:
> kj wrote:
>> Subject line pretty much says it all: is there a book like "Effective
>> Java"
>
> oxymoronic, no?
>
> Sorry, couldn't resist ;-)

Nothing to excuse for. I thought exactly the same thing.

Stefan



From james.harris.1 at googlemail.com  Thu Mar 11 03:30:02 2010
From: james.harris.1 at googlemail.com (James Harris)
Date: Thu, 11 Mar 2010 00:30:02 -0800 (PST)
Subject: Anything like "Effective Java" for Python?
References: <hn8d98$m0d$1@reader1.panix.com>
Message-ID: <62192fd8-2350-49c5-aeea-c8fe14878a61@d2g2000yqa.googlegroups.com>

On 10 Mar, 15:19, kj <no.em... at please.post> wrote:
> Subject line pretty much says it all: is there a book like "Effective
> Java" for Python. ?I.e. a book that assumes that readers are
> experienced programmers that already know the basics of the language,
> and want to focus on more advanced programming issues?

I don't know about the Java book you mention but I find Python in a
Nutshell published by O'Reilly to be a good reference.

James


From stava at telcotec.se  Thu Mar 11 03:43:50 2010
From: stava at telcotec.se (Lars Stavholm)
Date: Thu, 11 Mar 2010 14:13:50 +0530
Subject: pexpect and logging integration
In-Reply-To: <4B97A7BD.6050003@sequans.com>
References: <4B972EA7.50807@telcotec.se> <4B97A7BD.6050003@sequans.com>
Message-ID: <4B98AD46.6090702@telcotec.se>

It works like a charm, thank you!
/Lars

Jean-Michel Pichavant wrote:
> Lars Stavholm wrote:
>> Hi all,
>>
>> has anyone managed to integrate pexpect and logging?
>>
>> I.e., I'd like to be able to pick up the dialog,
>> commands sent and responses received, in my logging.
>> I know about the pexpect logfile, and I can log things
>> to stdout or stderr, but I really need to log using the
>> python logging library.
>>
>> Any thoughts appreciated
>> /Lars
>>
>>   
> I had to implement this.
> It's a bit of a hack, but it does the job.
> 
> The following code is tested with python 2.5, I remember pexpect behaves
> slightly differently in python 2.3.
> 
> import logging
> import pexpect
> import re
> 
> # this will be the method called by the pexpect object to log
> def _write(*args, **kwargs):
>    content = args[0]
>    # let's ignore other params, pexpect only use one arg AFAIK
>    if content in [' ', '', '\n', '\r', '\r\n']:
>        return # don't log empty lines
>    for eol in ['\r\n', '\r', '\n']:
>        # remove ending EOL, the logger will add it anyway
>        content = re.sub('\%s$' % eol, '', content)
>    return logger.info(content) # call the logger info method with the
> reworked content
> 
> 
> # our flush method
> def _doNothing():
>    pass
> 
> # get the logger
> logger = logging.getLogger('foo')
> 
> # configure the logger
> logger.handlers=[]
> logger.addHandler(logging.StreamHandler())
> logger.handlers[-1].setFormatter(logging.Formatter("%(asctime)s -
> %(name)s - %(levelname)s - %(message)s"))
> logger.setLevel(logging.INFO)
> 
> # give the logger the methods required by pexpect
> logger.write = _write
> logger.flush = _doNothing
> 
> p = pexpect.spawn('echo "hello world !!"', logfile=logger)
> p.expect('!!')
> 
> ... 2010-03-10 15:01:31,234 - foo - INFO - hello world !!
> 
> Hope it helps.
> 
> JM
> 
> 




From mihir3445 at gmail.com  Thu Mar 11 04:12:02 2010
From: mihir3445 at gmail.com (Mihir Patel)
Date: Thu, 11 Mar 2010 01:12:02 -0800 (PST)
Subject: EOFError: EOF when reading a line
Message-ID: <aaf3117e-8612-43f7-82dd-dcb628db5fd0@l12g2000prg.googlegroups.com>

I am trying to use the subprocess to send the data to child process. I
am not sure why i keep getting  "EOFError: EOF when reading a line"

i am using Python 2.4.3, GCC 4.1.2 20080704 (Red Hat 4.1.2-46)] on
64bit linux ,centos

Thanks

output :
=====
Traceback (most recent call last):
  File "test_input.py", line 3, in ?
    x = raw_input()
EOFError: EOF when reading a line
output: hello



Main Program:
===========

command_line = 'python test_input.py'
p =subprocess.Popen(command_line, shell=True, stdin=subprocess.PIPE,
stdout=subprocess.PIPE)
print 'output:', p.communicate()[0]

o,e = p.communicate('test')

print "out:",o
print "error:",e
p.stdout.close()

print "Exit Success"



test_input.py
==========
print 'hello\n'

x = raw_input()

print x


From jitu.icfai at gmail.com  Thu Mar 11 04:32:18 2010
From: jitu.icfai at gmail.com (jitendra gupta)
Date: Thu, 11 Mar 2010 15:02:18 +0530
Subject: Behavior of default parameter in a function
Message-ID: <ad2372b71003110132g74e2b621h26c5c59aea5ac657@mail.gmail.com>

def foo(x = [0]):
x[0] = x[0] + 1
return x[0]

def soo(x = None):
if x is None:
x = [0]
x[0] = x[0] + 1
return x[0]

>>> foo()
1
>>>foo()  #See the behavior incremented by one
2
>>>foo([1]) # but here based on given number
2
>>>foo()
3
>>>foo([1])
2
>>>foo()
4

>>>soo()
1
>>>soo()
1
>>>soo([1])
2
>>>soo()
1

Why foo() is incremented by 1 always when we are not passing any argument,
 but this is not happening in soo() case, In which scenario we will use
these type of  function.'

Thanks
Jitendra Kumar
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From shashank.sunny.singh at gmail.com  Thu Mar 11 04:40:43 2010
From: shashank.sunny.singh at gmail.com (Shashank Singh)
Date: Thu, 11 Mar 2010 15:10:43 +0530
Subject: Behavior of default parameter in a function
In-Reply-To: <ad2372b71003110132g74e2b621h26c5c59aea5ac657@mail.gmail.com>
References: <ad2372b71003110132g74e2b621h26c5c59aea5ac657@mail.gmail.com>
Message-ID: <332972a21003110140h4f83acbp55a0c75ced584ace@mail.gmail.com>

quoting from docs:http://docs.python.org/reference/compound_stmts.html

*Default parameter values are evaluated when the function definition is
executed.* This means that the expression is evaluated once, when the
function is defined, and that that same ?pre-computed? value is used for
each call. This is especially important to understand when a default
parameter is a mutable object, such as a list or a dictionary: if the
function modifies the object (e.g. by appending an item to a list), the
default value is in effect modified

so default object for x in foo is precomputed once and is modified with each
call.

hth
--shashank

On Thu, Mar 11, 2010 at 3:02 PM, jitendra gupta <jitu.icfai at gmail.com>wrote:

>
> def foo(x = [0]):
> x[0] = x[0] + 1
>  return x[0]
>
> def soo(x = None):
> if x is None:
> x = [0]
> x[0] = x[0] + 1
>  return x[0]
>
> >>> foo()
> 1
> >>>foo()  #See the behavior incremented by one
> 2
> >>>foo([1]) # but here based on given number
> 2
> >>>foo()
> 3
> >>>foo([1])
> 2
> >>>foo()
> 4
>
> >>>soo()
> 1
> >>>soo()
> 1
> >>>soo([1])
> 2
> >>>soo()
> 1
>
> Why foo() is incremented by 1 always when we are not passing any argument,
>  but this is not happening in soo() case, In which scenario we will use
> these type of  function.'
>
> Thanks
> Jitendra Kumar
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


-- 
Regards
Shashank Singh
Senior Undergraduate, Department of Computer Science and Engineering
Indian Institute of Technology Bombay
shashank.sunny.singh at gmail.com
http://www.cse.iitb.ac.in/~shashanksingh
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From george.sakkis at gmail.com  Thu Mar 11 05:21:51 2010
From: george.sakkis at gmail.com (George Sakkis)
Date: Thu, 11 Mar 2010 11:21:51 +0100
Subject: Multiple import of the same module under different names
Message-ID: <91ad5bf81003110221m5e383f8fkc7959aa2887927eb@mail.gmail.com>

The import mechanism is not very smart in identifying whether two
modules imported under different name are actually the same module, at
least when dealing with implicit relative imports and sys.path
manipulation. However, at least in cases of plain file modules, the
module's __file__ would be adequate (or at least better than __name__)
in determining this. Below is an illustration of the different
situations (absolute imports, explicit relative imports, implicit
relative import, sys.path tweaking). So why does not import consult
__file__ before deciding to create a new module instance ?

George


=== File structure =============

~/pkg/
   __init__.py  # empty
   mod1.py
   mod2.py
   mod3.py
   mod4.py
   main.py
   subpkg/
      __init__.py  # empty
      foo.py # empty

=== Run  =============

~$ PYTHONPATH=. python pkg/main.py

=== Output  =============

Imported foo from pkg.subpkg:	<module 'pkg.subpkg.foo' from
'/home/george/pkg/subpkg/foo.py'>
Imported foo from subpkg:		<module 'subpkg.foo' from
'/home/george/pkg/subpkg/foo.pyc'>
Imported foo from pkg.mod1:	<module 'pkg.subpkg.foo' from
'/home/george/pkg/subpkg/foo.py'>
Imported foo from mod1:		<module 'subpkg.foo' from
'/home/george/pkg/subpkg/foo.pyc'>
Imported foo from pkg.mod2:	<module 'pkg.subpkg.foo' from
'/home/george/pkg/subpkg/foo.py'>
Failed to import foo from mod2:    Attempted relative import in non-package
Imported foo from pkg.mod3:	<module 'pkg.subpkg.foo' from
'/home/george/pkg/subpkg/foo.py'>
Imported foo from mod3:		<module 'pkg.subpkg.foo' from
'/home/george/pkg/subpkg/foo.py'>
Imported foo from pkg.mod4:	<module 'foo' from
'/home/george/pkg/subpkg/foo.pyc'>
Imported foo from mod4:		<module 'foo' from '/home/george/pkg/subpkg/foo.pyc'>

* 9 total module(s)
* 3 distinct module(s)
	<module 'subpkg.foo' from '/home/george/pkg/subpkg/foo.pyc'>
	<module 'pkg.subpkg.foo' from '/home/george/pkg/subpkg/foo.py'>
	<module 'foo' from '/home/george/pkg/subpkg/foo.pyc'>
* 1 distinct file(s)
	/home/george/pkg/subpkg/foo.py

=== Code  =============

### mod1.py ###
# implicit relative import
from subpkg import foo

### mod2.py ###
# explicit relative import
from .subpkg import foo

### mod3.py ###
# absolute import
from pkg.subpkg import foo

### mod4.py ###
# absolute import after tweaking sys.path
import sys
from os.path import dirname,join
sys.path.append(join(dirname(__file__), 'subpkg'))
import foo

### main.py ###
#!/usr/bin/env python

from os.path import abspath, normpath

def test(*modules):
    module_set = set(modules)
    file_set = set(module_file(m) for m in modules)
    print '* %d total module(s)' % len(modules)
    print '* %d distinct module(s)' % len(module_set)
    for m in module_set:
        print '\t', m
    print '* %d distinct file(s)' % len(file_set)
    for f in file_set:
        print '\t', f

def module_file(mod):
    f = abspath(normpath(mod.__file__))
    if f.endswith('.pyc'):
        f = f[:-1]
    return f

if __name__ == '__main__':
    from pkg.subpkg import foo
    print 'Imported foo from pkg.subpkg:\t', foo
    from subpkg import foo as rel_foo
    print 'Imported foo from subpkg:\t\t', rel_foo

    from pkg.mod1 import foo as foo1
    print 'Imported foo from pkg.mod1:\t', foo1
    from mod1 import foo as rel_foo1
    print 'Imported foo from mod1:\t\t', rel_foo1

    from pkg.mod2 import foo as foo2
    print 'Imported foo from pkg.mod2:\t', foo2
    try: from mod2 import foo as rel_foo2
    except ValueError, ex:
        print 'Failed to import foo from mod2:', ex

    from pkg.mod3 import foo as foo3
    print 'Imported foo from pkg.mod3:\t', foo3
    from mod3 import foo as rel_foo3
    print 'Imported foo from mod3:\t\t', rel_foo3

    from pkg.mod4 import foo as foo4
    print 'Imported foo from pkg.mod4:\t', foo4
    from mod4 import foo as rel_foo4
    print 'Imported foo from mod4:\t\t', rel_foo4

    print
    test(foo, rel_foo,
         foo1, rel_foo1,
         foo2, # rel_foo2,
         foo3, rel_foo3,
         foo4, rel_foo4)


From Neil.Blue at biowisdom.com  Thu Mar 11 05:30:24 2010
From: Neil.Blue at biowisdom.com (Neil Blue)
Date: Thu, 11 Mar 2010 10:30:24 -0000
Subject: How to handle file uploads with http.server
In-Reply-To: <91ad5bf81003110221m5e383f8fkc7959aa2887927eb@mail.gmail.com>
References: <91ad5bf81003110221m5e383f8fkc7959aa2887927eb@mail.gmail.com>
Message-ID: <4728DC0EADB2654E8BA2A487F0CF2785AD6D2E@ws-ukexchange.internal.biowisdom.com>

Hello,

I have a basic http.server instance running (class
HTTPHandler(http.server.BaseHTTPRequestHandler), with python 3.1, and I
would like to upload files with multipart forms.

def do_POST(self):
	ctype, pdict = cgi.parse_header(self.headers['Content-Type'])
	if ctype=='multipart/form-data':
		print('parsing...')
		query=cgi.parse_multipart(self.rfile, pdict)
		print(query)

However the file never seems to finish being parsed. There are no errors,
but the call hangs at: query=cgi.parse_multipart(self.rfile, pdict)

Please can anyone offer some insight into this or somewhere else I may find
some more information.

Thanks
Neil

********************************************* 

The information contained in this message is likely to be confidential.  It is intended only for the person named above.  Any dissemination, distribution, copying, disclosure or use of this message or its contents unless authorised by BioWisdom Ltd is strictly prohibited. Any views or opinions expressed within this e-mail are those of the author and do not necessarily represent those of BioWisdom Ltd. If you have received this message in error, please immediately notify us and delete it.  Thank you.  Registered Office: BioWisdom Ltd, Harston Mill, Harston, Cambridge, CB22 7GG.  Registered in England: (GB) 3861669.  VAT registered: (GB) 750899881.  Tel: +44 (0)1223 874800, Fax: +44 (0) 1223 874801, Internet:www.biowisdom.com 

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From jeanmichel at sequans.com  Thu Mar 11 05:44:22 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Thu, 11 Mar 2010 11:44:22 +0100
Subject: logging: local functions ==> loss of lineno
In-Reply-To: <4B980DC6.4050807@hellmutweber.de>
References: <4B980DC6.4050807@hellmutweber.de>
Message-ID: <4B98C986.10707@sequans.com>

Hellmut Weber wrote:
> Hi Vinay Sajip,
> I'm very glad discoverd your logging module ;-)
> (That's what I would have liked 25 years ago when I was working as a 
> technical software developper!)
>
> Now I'm writing just some personal tools, I like python and want to 
> use logging on a regular basis.
>
> Logging works very well giving the filename and line number of the 
> point where it is called. As long as I use the loggers directly.
> BUT when I have to wrap the logger call in some other function, I 
> always get file name and line number of the call of the logger inside 
> the wrapping function.
>
> Is there a possibility to get this information in this situation too?
>
> TIA
>
> Hellmut
>
You have to specify the file and line number by yourself, the logging 
feature can only assume that you want the line number of the logger call.

i.e.

in test.py:

import logging
import inspect

_logger = logging.getLogger(__name__)

class Foo:
    def __init__(self):
        self._logger = _logger

    def info(self, msg):     
        previousFrame = inspect.currentframe().f_back
        self._logger.info(msg, 
extra={'custom_lineno':previousFrame.f_lineno, 'custom_filename': 
previousFrame.f_code.co_filename})

if __name__ == '__main__':
    _logger.handlers=[]
    _logger.addHandler(logging.StreamHandler())
    _logger.handlers[-1].setFormatter(logging.Formatter('file 
%(custom_filename)s line %(custom_lineno)d : %(message)s'))
    _logger.setLevel(logging.DEBUG)
    foo = Foo()
    foo.info('a foo info')

In [3]: run test.py
file test.py line 20 : a foo info


note that you cannot override the logging builtin 'lineno' key with the 
extra dictionary, that is why I'm using the 'custom_lineno' key. I don't 
know why the logger forbids it though, would have been nice to override 
lineno without the need of adding a new key.

JM


From __peter__ at web.de  Thu Mar 11 06:14:08 2010
From: __peter__ at web.de (Peter Otten)
Date: Thu, 11 Mar 2010 12:14:08 +0100
Subject: logging: local functions ==> loss of lineno
References: <mailman.576.1268256192.23598.python-list@python.org>
Message-ID: <hnaj9c$i0u$02$1@news.t-online.com>

Hellmut Weber wrote:

> Logging works very well giving the filename and line number of the point
> where it is called. As long as I use the loggers directly.
> BUT when I have to wrap the logger call in some other function, I always
> get file name and line number of the call of the logger inside the
> wrapping function.
> 
> Is there a possibility to get this information in this situation too?

The official way is probably to write a custom Logger class that overrides 
the findCaller() method.

Below is a hack that monkey-patches the logging._srcfile attribute to ignore 
user-specified modules in the call stack:

$ cat wrapper.py
import logging
import os
import sys

logger = logging.getLogger()

class SrcFile(object):
    def __init__(self, exclude_files):
        self.files = set(exclude_files)
    def __eq__(self, other):
        return other in self.files

def fixname(filename):
    if filename.lower().endswith((".pyc", ".pyo")):
        filename = filename[:-4] + ".py"
    return os.path.normcase(filename)

if "--monkey" in sys.argv:
    print "patching"
    logging._srcfile = SrcFile([logging._srcfile, fixname(__file__)])

def warn(*args, **kw):
    logger.warn(*args, **kw)

$ cat main.py
import logging
logging.basicConfig(format="%(filename)s <%(lineno)s>: %(message)s")
import wrapper
wrapper.warn("foo")
wrapper.warn("bar")
wrapper.warn("baz")

$ python main.py
wrapper.py <23>: foo
wrapper.py <23>: bar
wrapper.py <23>: baz

$ python main.py --monkey
patching
main.py <4>: foo
main.py <5>: bar
main.py <6>: baz

$ python -V
Python 2.6.4

Peter


From steve at holdenweb.com  Thu Mar 11 07:37:20 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 11 Mar 2010 07:37:20 -0500
Subject: Python Script to get Info from Site not working
In-Reply-To: <396ffb5b-8548-4e4d-8245-a53ecb3cff23@k24g2000pro.googlegroups.com>
References: <993c3089-0f96-4f37-b42a-111731045b2d@k24g2000pro.googlegroups.com>	<mailman.592.1268273109.23598.python-list@python.org>
	<396ffb5b-8548-4e4d-8245-a53ecb3cff23@k24g2000pro.googlegroups.com>
Message-ID: <hnao7j$hrk$1@dough.gmane.org>

Jimbo wrote:
> On Mar 11, 12:38 pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
>> En Wed, 10 Mar 2010 20:06:41 -0300, Jimbo <nill... at yahoo.com> escribi?:
>>
>>> I found a semi Python & internet tutorial here if anyone else would
>>> like ithttp://www.upriss.org.uk/python/session6.html
>>> My script is meant to find which radio button is selected & tell me
>>> that. But it just keeps saying "No Drink Selected!"
>> Are you sure? From the code you posted, the message should read "You need  
>> to select a drink!", not that one.
> 
>> Replace the last line with something like this, to see what you are  
>> getting exactly:
>>
>>         print("Sorry, no %r (%r) available." % (
>>            drink,
>>            cgi.escape(repr(type(drink)))))
>>
>> BTW, which Python version are you using? The tutorial you linked to is  
>> aimed at Python 2.x, but your print syntax suggests you're using Python 3.x
>>
>> --
>> Gabriel Genellina
> 
> Yeah that("You need to select a drink!") was the string I was getting
> but I should be getting hot chocolate or something else(which ever one
> I have selected)
> 
> I am using 3.x, do you think I should be using something else? Also
> the your code I put in does the some thing, just now it says "Sorry no
> none drink available" all the time.

It may not seem like it, but you *are* making progress here (of a sort).

>From the information you have given us so far it appears that your call
to form.getvalue() is returning None (which is of type <type 'NoneType'>
- your browser is probably not displaying this because it sees it as a
bogus HTML tag.

Perhaps you haven't yet realised the importance of exact copy-and-paste
here. What I'd like you to do is change the line

drink = form.getvalue("drink")

to

drink = form.getfirst("drink", "No drink selected")

then have you browser display the HTML source of the response page your
program is returning and paste that into a reply to this mail.

You might also want to take a look at

  http://docs.python.org/3.1/library/cgi.html

for further information about the Python library your are trying to use.
In particular I'd recommend heeding its advice about use of the cgitb
module.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Thu Mar 11 07:42:29 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 11 Mar 2010 07:42:29 -0500
Subject: Get a method instance through 'getattr' but not superclass's
	method
In-Reply-To: <e28756ee1003102047i2f60dbbev708e1cfa7a240f7f@mail.gmail.com>
References: <e28756ee1003102047i2f60dbbev708e1cfa7a240f7f@mail.gmail.com>
Message-ID: <hnaoh7$iv9$1@dough.gmane.org>

Radhakrishna Bhat wrote:
> I am using getattr to get a method instance from a class. But it also
> returns methods from the superclass. How to detect if an attribute is
> from superclass? 
> 
You could try, if x is in instance, looking to see whether the name is
defined in x.__class__.__dict__.

>>> class A:
...   def method1(self):
...       print "A1"
...   def method2(self):
...       print "A2"
...
>>> class B(A):
...   def method2(self):
...       print"B2"
...   def method3(self):
...       print "B3"
...
>>> a = A()
>>> b = B()
>>> b.method2()
B2
>>> b.method1()
A1
>>> b.method3()
B3
>>> b.__class__.__dict__
{'__module__': '__main__', 'method2': <function method2 at 0x7ff1d6bc>,
'method3': <function method3 at 0x7ff1d3ac>, '__doc__': None}
>>> a.__class__.__dict__
{'__module__': '__main__', 'method2': <function method2 at 0x7ff1d064>,
'__doc__': None, 'method1': <function method1 at 0x7ff1d6f4>}
>>>

I'd be interested to know why this is so important.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From ndbecker2 at gmail.com  Thu Mar 11 07:56:59 2010
From: ndbecker2 at gmail.com (Neal Becker)
Date: Thu, 11 Mar 2010 07:56:59 -0500
Subject: Can't define __call__ within __init__?
References: <mailman.544.1268226754.23598.python-list@python.org>
	<pan.2010.03.11.03.18.47@REMOVE.THIS.cybersource.com.au>
Message-ID: <hnapas$kk4$2@dough.gmane.org>

Steven D'Aprano wrote:

> On Wed, 10 Mar 2010 08:12:14 -0500, Neal Becker wrote:
> 
>> Want to switch __call__ behavior.  Why doesn't this work?  What is the
>> correct way to write this?
>> 
>> class X (object):
>>     def __init__(self, i):
>>         if i == 0:
>>             def __call__ (self):
>>                 return 0
>>         else:
>>             def __call_ (self):
>>                 return 1
> 
> 
> Others have already pointed out that there are two reasons that won't
> work:
> 
> (1) you define __call__ as a local variable of the __init__ method which
> then disappears as soon as the __init__ method completes; and
> 
> (2) special methods like __call__ are only called on the class, not the
> instance, so you can't give each instance its own method.
> 
> 
> Perhaps the best way to solve this is to use delegation:
> 
> 
> def zero_returner():
>     return 0
> 
> def one_returner():
>     return 1
> 
> 
> class X (object):
>     def __init__(self, i):
>         if i == 0:
>             self.func = zero_returner
>         else:
>             self.func = one_returner
>     def __call__(self, *args, **kwargs):
>         return self.func(*args, **kwargs)
> 
> 
> zero_returner and one_returner can be any callable object, not
> necessarily a function.
> 
> Of course, all this assumes that your solution isn't even simpler:
> 
> class X (object):
>     def __init__(self, i):
>         self.i = i
>     def __call__(self):
>         return self.i
> 
> but I assume if it was that simple, you would have done that already.
> 
> 
> 
The example I showed was just a toy problem.  The real problem is
I expect to call a function many times, and I want to avoid the overhead of 
the 'if blah' everytime.



From paskari007 at yahoo.ca  Thu Mar 11 07:58:35 2010
From: paskari007 at yahoo.ca (PEYMAN ASKARI)
Date: Thu, 11 Mar 2010 04:58:35 -0800 (PST)
Subject: a newbie's question
In-Reply-To: <ee9ad2071003102056m1e0587f7wcaf249d01bc22cc5@mail.gmail.com>
Message-ID: <493846.1798.qm@web30003.mail.mud.yahoo.com>

Hello

I need some help dynamically reloading modules. As it turns out, it is not as simple as calling reload, as outlined here
http://pyunit.sourceforge.net/notes/reloading.html

Is there builtin support for this? The example they gave does not seem to work for me, and I am unclear as to what PyUnit is.

Thanks


Peyman

--- On Thu, 3/11/10, Lan Qing <efiish at gmail.com> wrote:

From: Lan Qing <efiish at gmail.com>
Subject: Re: a newbie's question
To: "Python List" <python-list at python.org>
Received: Thursday, March 11, 2010, 4:56 AM

hi Cheers,?? ? Think you, that helps me a lot.

On Tue, Mar 9, 2010 at 10:00 PM, Simon Brunning <simon at brunningonline.net> wrote:

On 9 March 2010 13:51, Lan Qing <efiish at gmail.com> wrote:


> Hi all,

> ?? ? ?I'm a newbie of python programming language.



Welcome!



> I have used c/c++ for 5

> years, and one year experience in Lua programming language. Can any one give

> me some advice on learning python. Think you for any help!!



You'll find some useful starting points here -

<http://wiki.python.org/moin/BeginnersGuide/Programmers>.



--

Cheers,

Simon B.




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From jeanmichel at sequans.com  Thu Mar 11 08:10:40 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Thu, 11 Mar 2010 14:10:40 +0100
Subject: a newbie's question
In-Reply-To: <493846.1798.qm@web30003.mail.mud.yahoo.com>
References: <493846.1798.qm@web30003.mail.mud.yahoo.com>
Message-ID: <4B98EBD0.8020902@sequans.com>

PEYMAN ASKARI wrote:
> Hello
>
> I need some help dynamically reloading modules. As it turns out, it is 
> not as simple as calling reload, as outlined here
> http://pyunit.sourceforge.net/notes/reloading.html
>
> Is there builtin support for this? The example they gave does not seem 
> to work for me, and I am unclear as to what PyUnit is.
>
> Thanks
>
>
> Peyman
>

Please don't top post.
As for your question, there's no built-in method to reload a module 
because it is not possible (in a generic manner).

However if you *really* want to do it you can do it for your particular 
module (and only for this one).
It is tough to explain though. You have to know perfectly the python 
object model and I'm not familiar enough with it to do the explanation.

So:

1/ try to live without dynamic reload
2/ if you *really* require dynamic reload, you can try to execute the 
module in a subprocess. That way, every time you start a new subprocess, 
the last up to date version of the module is used
3/ reload the module and all it's related objects currently in memory, 
this is painfull and there are many traps to fall into. I'll let someone 
else answer this point.

JM


From radhakrishna12 at gmail.com  Thu Mar 11 08:15:19 2010
From: radhakrishna12 at gmail.com (Radhakrishna Bhat)
Date: Thu, 11 Mar 2010 18:45:19 +0530
Subject: Get a method instance through 'getattr' but not superclass's 
	method
In-Reply-To: <hnaoh7$iv9$1@dough.gmane.org>
References: <e28756ee1003102047i2f60dbbev708e1cfa7a240f7f@mail.gmail.com>
	<hnaoh7$iv9$1@dough.gmane.org>
Message-ID: <e28756ee1003110515y1b92b726k52b57c6919641806@mail.gmail.com>

Thanks. I just have to check in that string if method1 is from present in
subclass's __dict__ or not.
This is important for me because in my code, I am dynamically calling
methods of 2 classes where one is superclass of the other. And I was getting
duplicate results because of this problem.

-Radhakrishna

On Thu, Mar 11, 2010 at 6:12 PM, Steve Holden <steve at holdenweb.com> wrote:

> Radhakrishna Bhat wrote:
> > I am using getattr to get a method instance from a class. But it also
> > returns methods from the superclass. How to detect if an attribute is
> > from superclass?
> >
> You could try, if x is in instance, looking to see whether the name is
> defined in x.__class__.__dict__.
>
> >>> class A:
> ...   def method1(self):
> ...       print "A1"
> ...   def method2(self):
> ...       print "A2"
> ...
> >>> class B(A):
> ...   def method2(self):
> ...       print"B2"
> ...   def method3(self):
> ...       print "B3"
> ...
> >>> a = A()
> >>> b = B()
> >>> b.method2()
> B2
> >>> b.method1()
> A1
> >>> b.method3()
> B3
> >>> b.__class__.__dict__
> {'__module__': '__main__', 'method2': <function method2 at 0x7ff1d6bc>,
> 'method3': <function method3 at 0x7ff1d3ac>, '__doc__': None}
> >>> a.__class__.__dict__
> {'__module__': '__main__', 'method2': <function method2 at 0x7ff1d064>,
> '__doc__': None, 'method1': <function method1 at 0x7ff1d6f4>}
> >>>
>
> I'd be interested to know why this is so important.
>
> regards
>  Steve
> --
> Steve Holden           +1 571 484 6266   +1 800 494 3119
> See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
> Holden Web LLC                 http://www.holdenweb.com/
> UPCOMING EVENTS:        http://holdenweb.eventbrite.com/
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From steve at holdenweb.com  Thu Mar 11 08:30:12 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 11 Mar 2010 08:30:12 -0500
Subject: Can't define __call__ within __init__?
In-Reply-To: <hnapas$kk4$2@dough.gmane.org>
References: <mailman.544.1268226754.23598.python-list@python.org>	<pan.2010.03.11.03.18.47@REMOVE.THIS.cybersource.com.au>
	<hnapas$kk4$2@dough.gmane.org>
Message-ID: <hnaram$sv7$1@dough.gmane.org>

Neal Becker wrote:
> Steven D'Aprano wrote:
> 
>> On Wed, 10 Mar 2010 08:12:14 -0500, Neal Becker wrote:
>>
>>> Want to switch __call__ behavior.  Why doesn't this work?  What is the
>>> correct way to write this?
>>>
>>> class X (object):
>>>     def __init__(self, i):
>>>         if i == 0:
>>>             def __call__ (self):
>>>                 return 0
>>>         else:
>>>             def __call_ (self):
>>>                 return 1
>>
>> Others have already pointed out that there are two reasons that won't
>> work:
>>
>> (1) you define __call__ as a local variable of the __init__ method which
>> then disappears as soon as the __init__ method completes; and
>>
>> (2) special methods like __call__ are only called on the class, not the
>> instance, so you can't give each instance its own method.
>>
>>
>> Perhaps the best way to solve this is to use delegation:
>>
>>
>> def zero_returner():
>>     return 0
>>
>> def one_returner():
>>     return 1
>>
>>
>> class X (object):
>>     def __init__(self, i):
>>         if i == 0:
>>             self.func = zero_returner
>>         else:
>>             self.func = one_returner
>>     def __call__(self, *args, **kwargs):
>>         return self.func(*args, **kwargs)
>>
>>
>> zero_returner and one_returner can be any callable object, not
>> necessarily a function.
>>
>> Of course, all this assumes that your solution isn't even simpler:
>>
>> class X (object):
>>     def __init__(self, i):
>>         self.i = i
>>     def __call__(self):
>>         return self.i
>>
>> but I assume if it was that simple, you would have done that already.
>>
>>
>>
> The example I showed was just a toy problem.  The real problem is
> I expect to call a function many times, and I want to avoid the overhead of 
> the 'if blah' everytime.
> 
This is a premature optimization. First, make it work. Then (if it
doesn't work fast enough) make it work faster.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From astley.lejasper at gmail.com  Thu Mar 11 08:55:56 2010
From: astley.lejasper at gmail.com (Astley Le Jasper)
Date: Thu, 11 Mar 2010 05:55:56 -0800 (PST)
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
Message-ID: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>

I have a Windows 7 (64bit AMD) machine and am having quite a lot of
problems installing Reportlabs and Pil. I wondered if anyone else has
had the same issues and what the best way of dealing with it.

So far I've tried:

1. Reportlabs / Pil 32 installers - I've tried using these but they
can't find python. I also tried registering Python (http://effbot.org/
zone/python-register.htm) but this also fails.
2. Reportlabs / Pil Source - I downloaded each of these and tried to
do a "python setup.py install". However, both complain that they can't
find "vcvarsall.bat". I've done some checking and it's because the
compiler isn't present. Everyone is suggesting downloading Visual
Studio Express C++, but this only comes with the 32bit compiler. There
seems to be quite a lot of work to get 64bit VSE working on a 64bit
machine (http://jenshuebel.wordpress.com/2009/02/12/visual-c-2008-
express-edition-and-64-bit-targets/).

But before I start down that path, I wondered if anyone had any advice
(.... and no I don't mean suggesting I swap to Linux).

ALJ


From victorsubervi at gmail.com  Thu Mar 11 08:57:03 2010
From: victorsubervi at gmail.com (Victor Subervi)
Date: Thu, 11 Mar 2010 09:57:03 -0400
Subject: Interacting With Another Script
In-Reply-To: <2db4409d-d8d7-4af9-a9a7-e8071bc30b0f@o16g2000prh.googlegroups.com>
References: <4dc0cfea1003100432h2495ede1vf5e5bd75172ab5ea@mail.gmail.com>
	<mailman.559.1268238673.23598.python-list@python.org>
	<2db4409d-d8d7-4af9-a9a7-e8071bc30b0f@o16g2000prh.googlegroups.com>
Message-ID: <4dc0cfea1003110557y16ad8e65i81a136d841b7c07e@mail.gmail.com>

On Wed, Mar 10, 2010 at 10:16 PM, alex23 <wuwei23 at gmail.com> wrote:

> Victor Subervi <victorsube... at gmail.com> wrote:
> > > There's a program (vpopmail) that has commands which, when called,
> request
> > > input ("email address", "password", etc.) from the command line. I
> would
> > > like to build a TTW interface for my clients to use that interacts with
> > > these commands.
>
> The Pexpect[1] module is pretty much aimed at doing exactly this.
>
> 1: http://www.noah.org/wiki/Pexpect


THIS looks PERFECT! Thanks!
beno
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From andreengels at gmail.com  Thu Mar 11 09:14:45 2010
From: andreengels at gmail.com (Andre Engels)
Date: Thu, 11 Mar 2010 15:14:45 +0100
Subject: Can't define __call__ within __init__?
In-Reply-To: <hnaram$sv7$1@dough.gmane.org>
References: <mailman.544.1268226754.23598.python-list@python.org> 
	<pan.2010.03.11.03.18.47@REMOVE.THIS.cybersource.com.au>
	<hnapas$kk4$2@dough.gmane.org> <hnaram$sv7$1@dough.gmane.org>
Message-ID: <6faf39c91003110614v2b2aec8dg5c0c62f01fb56503@mail.gmail.com>

On Thu, Mar 11, 2010 at 2:30 PM, Steve Holden <steve at holdenweb.com> wrote:

>> The example I showed was just a toy problem. ?The real problem is
>> I expect to call a function many times, and I want to avoid the overhead of
>> the 'if blah' everytime.
>>
> This is a premature optimization. First, make it work. Then (if it
> doesn't work fast enough) make it work faster.

Corrolary: When you do make it faster, make it faster where it is slow.
Second corrolary: If making it fast is so important that these two
rules do not apply, Python is not your language of choice.


-- 
Andr? Engels, andreengels at gmail.com


From stefan_ml at behnel.de  Thu Mar 11 09:24:13 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Thu, 11 Mar 2010 15:24:13 +0100
Subject: Anything like "Effective Java" for Python?
In-Reply-To: <62192fd8-2350-49c5-aeea-c8fe14878a61@d2g2000yqa.googlegroups.com>
References: <hn8d98$m0d$1@reader1.panix.com>
	<62192fd8-2350-49c5-aeea-c8fe14878a61@d2g2000yqa.googlegroups.com>
Message-ID: <hnaued$9mp$1@dough.gmane.org>

James Harris, 11.03.2010 09:30:
> On 10 Mar, 15:19, kj<no.em... at please.post>  wrote:
>> Subject line pretty much says it all: is there a book like "Effective
>> Java" for Python.  I.e. a book that assumes that readers are
>> experienced programmers that already know the basics of the language,
>> and want to focus on more advanced programming issues?
>
> I don't know about the Java book you mention but I find Python in a
> Nutshell published by O'Reilly to be a good reference.

There's also the Python Cookbook that has a couple of useful recipes that 
can become handy at times.

http://code.activestate.com/recipes/langs/python/

Stefan



From gb345 at invalid.com  Thu Mar 11 09:57:37 2010
From: gb345 at invalid.com (gb345)
Date: Thu, 11 Mar 2010 14:57:37 +0000 (UTC)
Subject: Need advice on starting a Python group
Message-ID: <hnb0d1$2el$1@reader1.panix.com>




I'm hoping to get advice from anyone with prior experience setting
up a Python group. 

A friend of mine and I have been trying to start a
scientific-programming-oriented Python group in our school (of
medecine and bio research), with not much success.

The main problem is attendance.  Even though a *ton* of people have
told us that it's a great idea, that they're *very* interested,
and have asked to be added to our mailing list, the attendance to
our first few meeting has never been more than 5, including my
friend and I.  Last time just he and I showed up.

The second problem is getting content.  The format we'd envisioned
for this group was centered around code review (though not limited
to it).  The idea was that at every meeting a different member
would show some code.  This could be for any of a number of reasons,
such as, for example, 1) illustrate a cool module or technique; 2)
present a scientific research problem and how they used Python to
solve it, or get help solving it; 3) get general feedback (e.g. on
code clarity, software usability, module architecture, etc.).  But
in principle just about anything is OK: e.g. a talk on favorite
Python resources, or a comparison of Python with some other language,
or an overview of Python gotchas would all be fair game.

Also, we stressed that the talks were not expected to be polished:
no need for PowerPoint slides, etc.  Just project any old code onto
the screen, and talk about it, or scribble stuff on the chalkboard.

Still, we have a hard time finding volunteers.

And even when we've had volunteers, hardly anyone shows up!

Any suggestions would be appreciated.

GB

P.S.  There's a Python Meetup we could go to, but it does not fit
the bill for us: it doesn't meet often enough, it's sort of out of
the way, and has practically no one doing scientific programming.


From no.email at please.post  Thu Mar 11 10:05:30 2010
From: no.email at please.post (kj)
Date: Thu, 11 Mar 2010 15:05:30 +0000 (UTC)
Subject: Anything like "Effective Java" for Python?
References: <hn8d98$m0d$1@reader1.panix.com>
	<mailman.561.1268239578.23598.python-list@python.org>
Message-ID: <hnb0rq$7ji$1@reader1.panix.com>

In <mailman.561.1268239578.23598.python-list at python.org> Chris Withers <chris at simplistix.co.uk> writes:

>kj wrote:
>> 
>> 
>> Subject line pretty much says it all: is there a book like "Effective
>> Java" 

>oxymoronic, no?

>Sorry, couldn't resist ;-)

I hear you, but still: read "Effective Java" some day; it will make
you a better programmer, whatever your language preference.  I'm
certainly no fan of Java, but I still rank Effective Java as one
of my best reads on programming ever.  I felt that my maturity as
a programmer went up a notch or two after digesting this book.

Cheers,

~K


From philip at semanchuk.com  Thu Mar 11 10:09:08 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Thu, 11 Mar 2010 10:09:08 -0500
Subject: show image in python
In-Reply-To: <d698368f1003101403t519b5efdt94892902026aee0b@mail.gmail.com>
References: <d698368f1003101403t519b5efdt94892902026aee0b@mail.gmail.com>
Message-ID: <D2D58CB3-CF1D-4D37-8B32-01569D8BAA8F@semanchuk.com>


On Mar 10, 2010, at 5:03 PM, mohamed issolah wrote:

> Hey, This is my program
>
> 1 #!/usr/bin/python
>  2 import PIL
>  3 import numpy
>  4 import Image
>  5 import ImageOps
>  6 import sys
>  7
>  8 def Matimg(path):
>  9         """transforme image en matrice"""
> 10         Img = Image.open(str(path))
> 11         Img1 = ImageOps.grayscale(Img)
> 12         largeur,hauteur = Img1.size
> 13         imdata = Img1.getdata()
> 14         tab = numpy.array(imdata)
> 15         matrix = numpy.reshape(tab,(hauteur,largeur))
> 16         return matrix
> 17
> 18 def Creeimg():
> 19         """transforme matrice en image"""
> 20         img = Image.new ("L",(8,8))
> 21         matrix = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
> 22         img.putdata(matrix)
> 23         img.show()
> 24         img.save(fp="./ana.bmp")
> 25
> 26 if  __name__== '__main__':
> 27     if len(sys.argv) < 2 :
> 28         print "Usage: img.py <image>"
> 29         sys.exit(0)
> 30     path = sys.argv[1]
> 31     matrix = Matimg(path)
> 32     print matrix
> 33     Creeimg()
>
> My probeleme : In line 23 "img.show()" Don't work, normally I show  
> the image
> but it's not work, but strangely in line 24 "img.save(fp="./ 
> ana.bmp")" it's
> work
> WHERE IS THE PROBLEME.
>
> I have this error in shell : "(eog:3176): GLib-WARNING **: GError  
> set over
> the top of a previous GError or uninitialized memory.
> This indicates a bug in someone's code. You must ensure an error is  
> NULL
> before it's set.
> The overwriting error message was: Error in getting image file info "
>
>
> os: ubuntu 9.10

Hi issolah,
I don't know what your problem is but I have a few suggestions --
1) You say that img.show() doesn't work. How does it fail? Is that  
where you get the GLib warning?
2) I'm glad you posted your code, but because it has line numbers,  
it's awkward to copy & paste into a local example. Please show your  
code without line numbers.

I'm unfamiliar with PIL, so this is just a wild guess, but based on  
the GLib error it seems like you haven't initialized something  
properly. Sorry I couldn't be more helpful. Maybe someone who knows  
more will answer.

Good luck
Philip







From showell30 at yahoo.com  Thu Mar 11 10:16:25 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Thu, 11 Mar 2010 07:16:25 -0800 (PST)
Subject: Anything like "Effective Java" for Python?
References: <hn8d98$m0d$1@reader1.panix.com>
	<mailman.561.1268239578.23598.python-list@python.org> 
	<hnb0rq$7ji$1@reader1.panix.com>
Message-ID: <498a6d4c-3f8b-44fd-b2e0-23793031fee2@a16g2000pre.googlegroups.com>

On Mar 11, 7:05?am, kj <no.em... at please.post> wrote:
> In <mailman.561.1268239578.23598.python-l... at python.org> Chris Withers <ch... at simplistix.co.uk> writes:
>
> >kj wrote:
>
> >> Subject line pretty much says it all: is there a book like "Effective
> >> Java"
> >oxymoronic, no?
> >Sorry, couldn't resist ;-)
>
> I hear you, but still: read "Effective Java" some day; it will make
> you a better programmer, whatever your language preference. ?I'm
> certainly no fan of Java, but I still rank Effective Java as one
> of my best reads on programming ever. ?I felt that my maturity as
> a programmer went up a notch or two after digesting this book.
>

I'll second that.  I much prefer Python to Java, but Effective Java is
an excellent book.

Many of its topics would be applicable to Python, although the
solutions in Python would obviously be different.

  Eliminate obsolete object references (use None to break reference
counts)
  Avoid finalizers (use the "with" statement)
  Favor immutability
  Design method signatures carefully (including the x=[] gotcha)
  Optimize judiciously
  Don't ignore exceptions
  Avoid excessive synchronization

There are also some topics in Effective Java where the advice is
almost the opposite of Python tradition.





From CalWhoNOSPAM at roadrunner.com  Thu Mar 11 10:43:35 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Thu, 11 Mar 2010 10:43:35 -0500
Subject: I get the error:    ImportError: No module named ffnet
Message-ID: <hnb339$g2g$1@news.eternal-september.org>



I have the .py file in Eclipse
#@PydevCodeAnalysisIgnore
from ffnet import ffnet, mlgraph
topology = mlgraph( (2, 3, 1) )
nn = ffnet(topology)

I select RunAs / Python Run

I get the error
from ffnet import ffnet, mlgraph
ImportError: No module named ffnet

In the folder Python26\lib\site-packages I see
ffnet-0.6.2-py2.6.egg-info

also a folder ffnet
in that folder there is a folder Examples
If I click one of the examples pyrhon.exe opens and runs it OK.

Is there enough in the above for you to tell me how to procede?

Thanks in advance for any help at all





From kw at codebykevin.com  Thu Mar 11 10:44:12 2010
From: kw at codebykevin.com (Kevin Walzer)
Date: Thu, 11 Mar 2010 10:44:12 -0500
Subject: Anything like "Effective Java" for Python?
In-Reply-To: <hn8d98$m0d$1@reader1.panix.com>
References: <hn8d98$m0d$1@reader1.panix.com>
Message-ID: <94360$4b990fcc$4275d90a$23785@FUSE.NET>

On 3/10/10 10:19 AM, kj wrote:
> Subject line pretty much says it all: is there a book like "Effective
> Java" for Python.  I.e. a book that assumes that readers are
> experienced programmers that already know the basics of the language,
> and want to focus on more advanced programming issues?
>
> ~K
I haven't read "Effective Java," but I have found Lutz's "Programming 
Python" to be a very useful guide to solving various programming issues 
with the language. It's a big, big book, so there's lots to look at.

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


From icanbob at gmail.com  Thu Mar 11 10:54:44 2010
From: icanbob at gmail.com (bobicanprogram)
Date: Thu, 11 Mar 2010 07:54:44 -0800 (PST)
Subject: Ideas for creating processes
References: <mailman.577.1268257971.23598.python-list@python.org>
Message-ID: <0878d070-2c7a-4bdc-82eb-278432aa6695@b7g2000yqd.googlegroups.com>

On Mar 10, 4:52 pm, J <dreadpiratej... at gmail.com> wrote:
> I'm working on a project and thought I'd ask for a suggestion on how
> to proceed (I've got my own ideas, but I wanted to see if I was on the
> right track)
>
> For now, I've got this:
>
> def main():
> ## get our list of directories to refresh
>     releases=sys.argv[1:]
>     if len(releases) < 1:
>         print "You need to provide at least one dir to update"
>         sys.exit()
>
>     ## Lets figure out what there is to update
>     updateDirs = []
>     for rel in releases:
>         currentDir = os.path.join(homedir, rel)
>         for item in os.listdir(currentDir):
>             updateDirs += [os.path.join(homedir, rel, item)]
>
> which returns a list of full pathnames to directories that need to be
> updated (updates will be carried out by calling rsync or zsync
> eventually)
>
> The directory hierarchy looks like this:
>
> /home/user/files
> /home/user/files/version1
> /home/user/files/version1/type1
> /home/user/files/version1/type2
> /home/user/files/version2
> /home/user/files/version2/type1
>
> and the list ends up looking like this:
>
> ['/home/user/files/version1/type1','/home/user/files/version1/type2','/home/user/files/version2/type1','/home/user/files/version2/type2']
>
> the next thing I need to do is figure out how to update those.
>
> the quick and dirty would be (as I'm imagining it at the moment):
> for path in pathlist:
>     chdir into path
>     execute rsync or zsync
>
> but that gets me moving into one dir, updating, then moving into another.
>
> What I was wondering about though, is spawning off separate rsync
> processes to run concurrently (each rsync will hit a different remote
> dir for each local dir)
>
> so I'm trying to figure out a good way to do this:
>
> for path in pathlist:
>     kick off an individual rsync|zsync process to update path
>
> wait for all child processes to end
> exit program.
>
> I've been looking at subprocess because at the moment, that's all I
> really know...
> But is there a better way of kicking off multiple simultaneous
> processes so I can update all dirs at once instead of one at a time?
>
> No, this isn't homework, it's something I'm working on to sync a
> couple directories of ISO images to grab nightly builds
> Yes, there are plenty of pre-made scripts out there, but I don't want
> to even look at those because I figured this would be a good learning
> experience, and I want to try to solve this as much on my own as I can
> without just cut and pasting from someone elses program.
>
> So, with that said, any ideas on the best way to proceed?  I'm going
> to start looking at ways to use subprocess to do this, or would there
> be a better way (multi-threading maybe?)
>
> Or am I even in the right ballpark?
>
> Cheers
> Jeff


You might be able to use the SIMPL toolkit for this one.
(http://www.icanprogram.com/06py/lesson1/lesson1.html)

You could wrap the rsync executable as a SIMPL receiver module and
then message to that from inside your Python script to kick it off and
synchronize actions.

bob


From dvkeeney at gmail.com  Thu Mar 11 11:00:29 2010
From: dvkeeney at gmail.com (dkeeney)
Date: Thu, 11 Mar 2010 08:00:29 -0800 (PST)
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<4b90a1f8$0$1629$742ec2ed@news.sonic.net>
	<0d381135-730a-45e4-9225-9ba2a29b77fe@k2g2000pro.googlegroups.com>
	<Xns9D35C3BFCE829duncanbooth@127.0.0.1>
Message-ID: <3707bdd1-7371-445e-b303-96c2b636102d@e19g2000prn.googlegroups.com>

On Mar 8, 12:14?pm, Duncan Booth <duncan.bo... at invalid.invalid> wrote:

> You've totally missed the point. It isn't the size of the data you have
> today that matters, it's the size of data you could have in several years'
> time.
>
> Maybe today you've got 10 users each with 10 megabytes of data, but you're
> aspiring to become the next twitter/facebook or whatever. It's a bit late
> as you approach 100 million users (and a petabyte of data) to discover that
> your system isn't scalable: scalability needs to be built in from day one.

Do you have examples of sites that got big by planning their site
architecture from day 0 to be big?

Judging from published accounts, even Facebook and Twitter did not
plan to be  'the next twitter/facebook'; each started with routine
LAMP stack architecture and successfully re-engineered the
architecture multiple times on the way up.

Is there compelling reason to think the 'next twitter/facebook' can't
and won't climb a very similar path?

I see good reasons to think that they *will* follow the same path, in
that there are motivations at both ends of the path for re-engineering
as you go.  When the site is small, resources commited to the backend
are not spent on making the frontend useful, so business-wise the best
backend is the cheapest one.  When the site becomes super-large, the
backend gets re-engineered based on what that organization learned
while the site was just large; Facebook, Twitter, and Craigslist all
have architectures custom designed to support their specific needs.
Had they tried to design for large size while they were small, they
would have failed; they couldn't have known enough then about what
they would eventually need.

The only example I can find of a large site that architected large
very early is Google, and they were aiming for a market (search) that
was already known to be huge.

Its reasonable to assume that the 'next twitter/facebook' will *not*
be in web search, social-networking, broadcast instant messaging, or
classified ads, just because those niches are taken already.  So
whichever 'high-scalability' model the aspiring site uses will be the
wrong one.  They might as well start with a quick and cheap LAMP
stack, and re-engineer as they go.

Just one internet watcher's biased opinion...

David


www.rdbhost.com -> SQL databases via a web-service



From python at mrabarnett.plus.com  Thu Mar 11 11:01:41 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 11 Mar 2010 16:01:41 +0000
Subject: Can't define __call__ within __init__?
In-Reply-To: <6faf39c91003110614v2b2aec8dg5c0c62f01fb56503@mail.gmail.com>
References: <mailman.544.1268226754.23598.python-list@python.org>
	<pan.2010.03.11.03.18.47@REMOVE.THIS.cybersource.com.au>	<hnapas$kk4$2@dough.gmane.org>
	<hnaram$sv7$1@dough.gmane.org>
	<6faf39c91003110614v2b2aec8dg5c0c62f01fb56503@mail.gmail.com>
Message-ID: <4B9913E5.7060404@mrabarnett.plus.com>

Andre Engels wrote:
> On Thu, Mar 11, 2010 at 2:30 PM, Steve Holden <steve at holdenweb.com> wrote:
> 
>>> The example I showed was just a toy problem.  The real problem is
>>> I expect to call a function many times, and I want to avoid the overhead of
>>> the 'if blah' everytime.
>>>
>> This is a premature optimization. First, make it work. Then (if it
>> doesn't work fast enough) make it work faster.
> 
> Corrolary: When you do make it faster, make it faster where it is slow.
> Second corrolary: If making it fast is so important that these two
> rules do not apply, Python is not your language of choice.
> 
Addendum: a bad algorithm is bad, whatever language it's written in.


From gnarlodious at gmail.com  Thu Mar 11 11:02:59 2010
From: gnarlodious at gmail.com (Gnarlodious)
Date: Thu, 11 Mar 2010 08:02:59 -0800 (PST)
Subject: Insert missing keys using defaultdict
Message-ID: <55e00342-a83e-4e45-8448-d04e71251631@c16g2000yqd.googlegroups.com>

I am trying to grok this documentation but need help:
http://docs.python.org/library/collections.html#defaultdict-examples

In a perfect world the dict looks like this:
plistDict={'Style':'ExternalURL', 'Ref':'http://Gnarlodious.com/',
'Tip':'Opens in a new window', 'Text':'Gnarlodious.com'}

Let's say I want to prep a dict from a plist to insert the values into
an HTML link string:
"<a class='%(Style)s' href='%(Ref)s' title='%(Tip)s'>%(Text)s</a>" %
plistDict

However, in this imperfect world the dict might look like this:
plistDict={'Ref':'http://Gnarlodious.com/', 'Text':'Gnarlodious.com'}

which would error:
KeyError: 'Style'

So using defaultdict:
from collections import defaultdict

How do create a dict assigning every missing key with a default
string?

-- Gnarlie


From isso.moh at gmail.com  Thu Mar 11 11:07:39 2010
From: isso.moh at gmail.com (mohamed issolah)
Date: Thu, 11 Mar 2010 17:07:39 +0100
Subject: show image in python
In-Reply-To: <D2D58CB3-CF1D-4D37-8B32-01569D8BAA8F@semanchuk.com>
References: <d698368f1003101403t519b5efdt94892902026aee0b@mail.gmail.com>
	<D2D58CB3-CF1D-4D37-8B32-01569D8BAA8F@semanchuk.com>
Message-ID: <d698368f1003110807o2c853d34p7179d068603ba606@mail.gmail.com>

hey
#!/usr/bin/python
  2 import PIL
  3 import numpy
  4 import Image
   import ImageOps
   import sys

   def Matimg(path):
           """transforme image en matrice"""
          Img = Image.open(str(path))
          Img1 = ImageOps.grayscale(Img)
          largeur,hauteur = Img1.size
          imdata = Img1.getdata()
          tab = numpy.array(imdata)
          matrix = numpy.reshape(tab,(hauteur,largeur))
          return matrix

  def Creeimg():
          """transforme matrice en image"""
          img = Image.new ("L",(8,8))
          matrix = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
          img.putdata(matrix)
          img.show()
          img.save(fp="./ana.bmp")

  if  __name__== '__main__':
      if len(sys.argv) < 2 :
          print "Usage: img.py <image>"
          sys.exit(0)
     path = sys.argv[1]
     matrix = Matimg(path)
     print matrix
     Creeimg()


2010/3/11 Philip Semanchuk <philip at semanchuk.com>

>
> On Mar 10, 2010, at 5:03 PM, mohamed issolah wrote:
>
>  Hey, This is my program
>>
>> 1 #!/usr/bin/python
>>  2 import PIL
>>  3 import numpy
>>  4 import Image
>>  5 import ImageOps
>>  6 import sys
>>  7
>>  8 def Matimg(path):
>>  9         """transforme image en matrice"""
>> 10         Img = Image.open(str(path))
>> 11         Img1 = ImageOps.grayscale(Img)
>> 12         largeur,hauteur = Img1.size
>> 13         imdata = Img1.getdata()
>> 14         tab = numpy.array(imdata)
>> 15         matrix = numpy.reshape(tab,(hauteur,largeur))
>> 16         return matrix
>> 17
>> 18 def Creeimg():
>> 19         """transforme matrice en image"""
>> 20         img = Image.new ("L",(8,8))
>> 21         matrix = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
>> 22         img.putdata(matrix)
>> 23         img.show()
>> 24         img.save(fp="./ana.bmp")
>> 25
>> 26 if  __name__== '__main__':
>> 27     if len(sys.argv) < 2 :
>> 28         print "Usage: img.py <image>"
>> 29         sys.exit(0)
>> 30     path = sys.argv[1]
>> 31     matrix = Matimg(path)
>> 32     print matrix
>> 33     Creeimg()
>>
>> My probeleme : In line 23 "img.show()" Don't work, normally I show the
>> image
>> but it's not work, but strangely in line 24 "img.save(fp="./ana.bmp")"
>> it's
>> work
>> WHERE IS THE PROBLEME.
>>
>> I have this error in shell : "(eog:3176): GLib-WARNING **: GError set over
>> the top of a previous GError or uninitialized memory.
>> This indicates a bug in someone's code. You must ensure an error is NULL
>> before it's set.
>> The overwriting error message was: Error in getting image file info "
>>
>>
>> os: ubuntu 9.10
>>
>
> Hi issolah,
> I don't know what your problem is but I have a few suggestions --
> 1) You say that img.show() doesn't work. How does it fail? Is that where
> you get the GLib warning?
> 2) I'm glad you posted your code, but because it has line numbers, it's
> awkward to copy & paste into a local example. Please show your code without
> line numbers.
>
> I'm unfamiliar with PIL, so this is just a wild guess, but based on the
> GLib error it seems like you haven't initialized something properly. Sorry I
> couldn't be more helpful. Maybe someone who knows more will answer.
>
> Good luck
> Philip
>
>
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
issolah mohamed
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From showell30 at yahoo.com  Thu Mar 11 11:20:14 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Thu, 11 Mar 2010 08:20:14 -0800 (PST)
Subject: Can't define __call__ within __init__?
References: <mailman.544.1268226754.23598.python-list@python.org> 
	<pan.2010.03.11.03.18.47@REMOVE.THIS.cybersource.com.au>
Message-ID: <b1a8cceb-ca90-4f84-9cdf-8f07cb116a94@l24g2000prh.googlegroups.com>

On Mar 10, 7:18?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Wed, 10 Mar 2010 08:12:14 -0500, Neal Becker wrote:
> > Want to switch __call__ behavior. ?Why doesn't this work? ?What is the
> > correct way to write this?
>
> > class X (object):
> > ? ? def __init__(self, i):
> > ? ? ? ? if i == 0:
> > ? ? ? ? ? ? def __call__ (self):
> > ? ? ? ? ? ? ? ? return 0
> > ? ? ? ? else:
> > ? ? ? ? ? ? def __call_ (self):
> > ? ? ? ? ? ? ? ? return 1
>
> Others have already pointed out that there are two reasons that won't
> work:
>
> (1) you define __call__ as a local variable of the __init__ method which
> then disappears as soon as the __init__ method completes; and
>
> (2) special methods like __call__ are only called on the class, not the
> instance, so you can't give each instance its own method.
>

Are you sure about that?  This program prints 1, 2, 1, 2.

    class Foo:
        def __init__(self, a):
            if a == 1:
                self.__call__ = lambda: 1
            else:
                self.__call__ = lambda: 2

    foo1 = Foo(1)
    print foo1()

    foo2 = Foo(2)
    print foo2()

    print foo1()
    print foo2()

See here:

http://docs.python.org/reference/datamodel.html

Class instances
    Class instances are described below. Class instances are callable
only when the class has a __call__() method; x(arguments) is a
shorthand for x.__call__(arguments).


From george.sakkis at gmail.com  Thu Mar 11 11:20:47 2010
From: george.sakkis at gmail.com (George Sakkis)
Date: Thu, 11 Mar 2010 08:20:47 -0800 (PST)
Subject: Insert missing keys using defaultdict
References: <55e00342-a83e-4e45-8448-d04e71251631@c16g2000yqd.googlegroups.com>
Message-ID: <350e66eb-5c5b-4abe-826b-44a73a90053c@33g2000yqj.googlegroups.com>

On Mar 11, 5:02?pm, Gnarlodious <gnarlodi... at gmail.com> wrote:

> I am trying to grok this documentation but need help:http://docs.python.org/library/collections.html#defaultdict-examples
>
> In a perfect world the dict looks like this:
> plistDict={'Style':'ExternalURL', 'Ref':'http://Gnarlodious.com/',
> 'Tip':'Opens in a new window', 'Text':'Gnarlodious.com'}
>
> Let's say I want to prep a dict from a plist to insert the values into
> an HTML link string:
> "<a class='%(Style)s' href='%(Ref)s' title='%(Tip)s'>%(Text)s</a>" %
> plistDict
>
> However, in this imperfect world the dict might look like this:
> plistDict={'Ref':'http://Gnarlodious.com/', 'Text':'Gnarlodious.com'}
>
> which would error:
> KeyError: 'Style'
>
> So using defaultdict:
> from collections import defaultdict
>
> How do create a dict assigning every missing key with a default
> string?

"<a class='%(Style)s' href='%(Ref)s' title='%(Tip)s'>%(Text)s</a>" %
defaultdict(lambda:'_MISSING_', plistDict)

HTH,
George


From gnarlodious at gmail.com  Thu Mar 11 11:27:24 2010
From: gnarlodious at gmail.com (Gnarlodious)
Date: Thu, 11 Mar 2010 08:27:24 -0800 (PST)
Subject: Insert missing keys using defaultdict
References: <55e00342-a83e-4e45-8448-d04e71251631@c16g2000yqd.googlegroups.com>
	<350e66eb-5c5b-4abe-826b-44a73a90053c@33g2000yqj.googlegroups.com>
Message-ID: <2b32f4ae-a61d-4a5b-a085-1df16a6cea58@c16g2000yqd.googlegroups.com>

On Mar 11, 9:20?am, George Sakkis wrote:

> > How do create a dict assigning every missing key with a default
> > string?
>
> "<a class='%(Style)s' href='%(Ref)s' title='%(Tip)s'>%(Text)s</a>" %
> defaultdict(lambda:'_MISSING_', plistDict)

Brilliant, I love Python.

-- Gnarlie



From rizwanahmed24 at gmail.com  Thu Mar 11 11:28:38 2010
From: rizwanahmed24 at gmail.com (rizwanahmed24 at gmail.com)
Date: Thu, 11 Mar 2010 08:28:38 -0800 (PST)
Subject: bypass UAC control through python script (to be run from batchfile)
Message-ID: <26028cd0-8ead-47d0-95d8-09e2214dddd3@e7g2000yqf.googlegroups.com>

Hi

here is my problem.

i want to install a program through python script. The python scripts
is called from a batch file. The UAC control is not allowing the
python script to install a msi (installer). I need to somehow by pass
the UAC control. i dont want to turn it off permanently. Once i have
run the batch file, i do not interact with the system manually,
therefore Clicking allow on UAC dialog is not the solution for me.

i just want to achieve the goal, whether i run batch file in Admin
mode, or do it form python, doesnt matter.
any ideas?

//Rizwan


From robin at reportlab.com  Thu Mar 11 11:29:26 2010
From: robin at reportlab.com (Robin Becker)
Date: Thu, 11 Mar 2010 16:29:26 +0000
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
In-Reply-To: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>
Message-ID: <4B991A66.4020203@chamonix.reportlab.co.uk>

On 11/03/2010 13:55, Astley Le Jasper wrote:
> I have a Windows 7 (64bit AMD) machine and am having quite a lot of
> problems installing Reportlabs and Pil. I wondered if anyone else has
> had the same issues and what the best way of dealing with it.
>
> So far I've tried:
>
> 1. Reportlabs / Pil 32 installers - I've tried using these but they
> can't find python. I also tried registering Python (http://effbot.org/
> zone/python-register.htm) but this also fails.
> 2. Reportlabs / Pil Source - I downloaded each of these and tried to
> do a "python setup.py install". However, both complain that they can't
> find "vcvarsall.bat". I've done some checking and it's because the
> compiler isn't present. Everyone is suggesting downloading Visual
> Studio Express C++, but this only comes with the 32bit compiler. There
> seems to be quite a lot of work to get 64bit VSE working on a 64bit
> machine (http://jenshuebel.wordpress.com/2009/02/12/visual-c-2008-
> express-edition-and-64-bit-targets/).
>
> But before I start down that path, I wondered if anyone had any advice
> (.... and no I don't mean suggesting I swap to Linux).
>
> ALJ

Hi,

you might get more assistance on the reportlab users mailing list at

http://two.pairlist.net/mailman/listinfo/reportlab-users

We do have users that run both reportlab & pil on 64 bit linux architectures, 
but I don't think I have ever compiled any of the extensions for 64bit windows. 
The vcvarsall.bat reference is the distutils package desperately  looking for a 
suitable compiler (and not finding it).

Perhaps some expert on the python list knows which versions of VS support 64bit; 
I do have VS 2005/2008 etc, but I'll probably need to set up a 64bit machine to 
see if they will install on a 64bit architecture.
-- 
Robin Becker



From __peter__ at web.de  Thu Mar 11 11:36:03 2010
From: __peter__ at web.de (Peter Otten)
Date: Thu, 11 Mar 2010 17:36:03 +0100
Subject: Can't define __call__ within __init__?
References: <mailman.544.1268226754.23598.python-list@python.org>
	<pan.2010.03.11.03.18.47@REMOVE.THIS.cybersource.com.au>
	<b1a8cceb-ca90-4f84-9cdf-8f07cb116a94@l24g2000prh.googlegroups.com>
Message-ID: <hnb64u$ah4$03$1@news.t-online.com>

Steve Howell wrote:

> On Mar 10, 7:18 pm, Steven D'Aprano
> <ste... at REMOVE.THIS.cybersource.com.au> wrote:

>> (2) special methods like __call__ are only called on the class, not the
>> instance, so you can't give each instance its own method.

> Are you sure about that?  This program prints 1, 2, 1, 2.
 
You are using a classic class while the behaviour described above applies to 
newstyle classes:

>>> class Foo:
...     def __init__(self):
...             self.__call__ = lambda: 42
...
>>> Foo()()
42
>>> class Bar(object):
...     def __init__(self):
...             self.__call__ = lambda: 42
...
>>> Bar()()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'Bar' object is not callable

I don't think it's a good idea to write new code that requires a classic 
class.

Peter


From gherron at islandtraining.com  Thu Mar 11 11:48:20 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Thu, 11 Mar 2010 08:48:20 -0800
Subject: Behavior of default parameter in a function
In-Reply-To: <ad2372b71003110132g74e2b621h26c5c59aea5ac657@mail.gmail.com>
References: <ad2372b71003110132g74e2b621h26c5c59aea5ac657@mail.gmail.com>
Message-ID: <4B991ED4.1030203@islandtraining.com>

This is addressed in the FAQ.

  
http://www.python.org/doc/faq/general/#why-are-default-values-shared-between-objects

jitendra gupta wrote:
>
> def foo(x = [0]):
> x[0] = x[0] + 1
> return x[0]
>
> def soo(x = None):
> if x is None:
> x = [0]
> x[0] = x[0] + 1
> return x[0]
>
> >>> foo()
> 1
> >>>foo()  #See the behavior incremented by one 
> 2
> >>>foo([1]) # but here based on given number 
> 2
> >>>foo() 
> 3
> >>>foo([1])
> 2
> >>>foo()
> 4
>
> >>>soo()
> 1
> >>>soo()
> 1
> >>>soo([1])
> 2
> >>>soo()
> 1
>
> Why foo() is incremented by 1 always when we are not passing any argument,
>  but this is not happening in soo() case, In which scenario 
> we will use these type of  function.'
>
> Thanks 
> Jitendra Kumar
>



From CalWhoNOSPAM at roadrunner.com  Thu Mar 11 12:04:20 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Thu, 11 Mar 2010 12:04:20 -0500
Subject: I get the error:    ImportError: No module named ffnet
References: <hnb339$g2g$1@news.eternal-september.org>
Message-ID: <hnb7qn$a7s$1@news.eternal-september.org>

I ran this:
import sys

from pprint import pprint as pp

pp(sys.path)



The output included:

'E:\\Program Files\\Python26',

'E:\\Program Files\\Python26\\DLLs',

'E:\\Program Files\\Python26\\lib',

'E:\\Program Files\\Python26\\lib\\lib-tk',

'E:\\Program Files\\Python26\\lib\\plat-win',

'E:\\Program Files\\Python26\\lib\\site-packages',



Python is at

E:\Python26

but other things like java are at E:\Program Files

Showhow it is looking in the wrong place and I don't know how to fix it.

I checked the registry. The entries all look good there.



Thanks







" Cal Who" <CalWhoNOSPAM at roadrunner.com> wrote in message 
news:hnb339$g2g$1 at news.eternal-september.org...
>
>
> I have the .py file in Eclipse
> #@PydevCodeAnalysisIgnore
> from ffnet import ffnet, mlgraph
> topology = mlgraph( (2, 3, 1) )
> nn = ffnet(topology)
>
> I select RunAs / Python Run
>
> I get the error
> from ffnet import ffnet, mlgraph
> ImportError: No module named ffnet
>
> In the folder Python26\lib\site-packages I see
> ffnet-0.6.2-py2.6.egg-info
>
> also a folder ffnet
> in that folder there is a folder Examples
> If I click one of the examples pyrhon.exe opens and runs it OK.
>
> Is there enough in the above for you to tell me how to procede?
>
> Thanks in advance for any help at all
>
>
> 




From bartc at freeuk.com  Thu Mar 11 12:22:49 2010
From: bartc at freeuk.com (bartc)
Date: Thu, 11 Mar 2010 17:22:49 GMT
Subject: Named loops for breaking
In-Reply-To: <c809ceee-34ff-409c-b645-3cb833ce6f8a@g19g2000yqe.googlegroups.com>
References: <6d6a35e8-f09c-4792-8abe-5a0dc24d214e@g28g2000yqh.googlegroups.com>
	<mailman.529.1268202554.23598.python-list@python.org>
	<c809ceee-34ff-409c-b645-3cb833ce6f8a@g19g2000yqe.googlegroups.com>
Message-ID: <JF9mn.49426$Ym4.1808@text.news.virginmedia.com>

James Harris wrote:
> On 10 Mar, 06:29, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
>> En Tue, 09 Mar 2010 18:41:10 -0300, Daniel Klein <bri... at gmail.com>
>> escribi :
>>
>>> Basically I'm wondering if there are any plans to implemented named
>>> loops in Python, so I can tell a break command to break out of a
>>> specific loop in the case of nested loops.
>>
>> See PEP3136 [1] and its rejection note [2]
>> I think you may find some more discussion in the python-ideas list.

> Breaking out of an inner loop is just as natural as breaking out of
> the immediately enclosing loop. ISTM that if one is allowed the other
> should be also.

Exactly. Python already has single-level break (probably some baggage 
carried over from C), and some of the same arguments can be applied to that 
too.

Given that break does exist, it's annoying that in the followed contrived 
example:

def f(n):
        return n==2

for i in range(10):
        print i
        if f(0): break
        if f(1): break
        if f(2): break
        if f(3): break

I can't turn the list of ifs into a loop. I can use break embedded inside a 
statement inside a loop, provided it's not another loop! That's 
discrimination...

> There are often times when it *is* better to factor out the code to a
> different function but adding a function just to enable a break from
> an inner loop doesn't seem to me a good reason.

Multi-level breaks should just have been part of the language, so they are 
available to those who want them, and ignored by everyone else.

(And in languages where I've implemented them -- all generally faster than 
Python -- they have no impact on performance. I also had 4 loop controls 
rather than just 2, all multi-level, and the world hasn't ended yet.)

My experience of these break statements is that they are used infrequently 
in final code. But they are handy when developing code too: you don't want 
to waste time refactoring, and generally turning code upside-down, when the 
code has to be rewritten a dozen times anyway.

-- 
Bartc 



From mrkafk at gmail.com  Thu Mar 11 12:28:04 2010
From: mrkafk at gmail.com (mk)
Date: Thu, 11 Mar 2010 18:28:04 +0100
Subject: Anything like "Effective Java" for Python?
In-Reply-To: <hn8d98$m0d$1@reader1.panix.com>
References: <hn8d98$m0d$1@reader1.panix.com>
Message-ID: <hnb973$loh$1@dough.gmane.org>

kj wrote:
> 
> 
> Subject line pretty much says it all: is there a book like "Effective
> Java" for Python.  I.e. a book that assumes that readers are
> experienced programmers that already know the basics of the language,
> and want to focus on more advanced programming issues?

I'm surprised nobody mentioned Dive Into Python:

http://diveintopython.org/

Available for free online. Most Python books contain a lot of 'hello 
world' material which for someone who knows at least one programming 
language is boring, this one doesn't, it cuts straight to the point. I 
found it very readable.

Regards,
mk





From mehgcap at gmail.com  Thu Mar 11 12:51:57 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Thu, 11 Mar 2010 12:51:57 -0500
Subject: importing modules from subdirs
Message-ID: <bc7f680c1003110951p7d1253d9nb8b67e47f41d3970@mail.gmail.com>

Hi all,
The manual says, for modules in a project stored in subdirectories, you can do:
import folderName.module

I have a couple questions, though:
1. Do I then have to call functions from module like
folder.module.function, or can I still use the normal module.function?

2. When I try to do this, it fails. I have an sw folder. Inside that I
have a modes folder, holding weather.pyw. Main.pyw, back in the sw
folder, is trying to import modes.weather, but nothing happens. I have
tried putting weather.pyw in its own weather folder under the modes
folder, but that also fails. I have placed an empty __init__.py file
in both the modes folder and the weather subfolder, but I cannot get
main.pyw to import weather!

3. How does weather import from a folder above or beside it? For
example, if a config directory is at the same level as the modes
directory, how can weather import something from config?

Thanks!

-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From gherron at islandtraining.com  Thu Mar 11 13:00:10 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Thu, 11 Mar 2010 10:00:10 -0800
Subject: importing modules from subdirs
In-Reply-To: <bc7f680c1003110951p7d1253d9nb8b67e47f41d3970@mail.gmail.com>
References: <bc7f680c1003110951p7d1253d9nb8b67e47f41d3970@mail.gmail.com>
Message-ID: <4B992FAA.2020102@islandtraining.com>

Alex Hall wrote:
> Hi all,
> The manual says, for modules in a project stored in subdirectories, you can do:
> import folderName.module
>
> I have a couple questions, though:
> 1. Do I then have to call functions from module like
> folder.module.function, or can I still use the normal module.function?
>   

Either, depending on how you do the import:

import folder.module
folder.module.function()

or

from folder.module import function
function()

or

from folder import module
module.function()

> 2. When I try to do this, it fails. I have an sw folder. Inside that I
> have a modes folder, holding weather.pyw. Main.pyw, back in the sw
> folder, is trying to import modes.weather, but nothing happens. I have
> tried putting weather.pyw in its own weather folder under the modes
> folder, but that also fails. I have placed an empty __init__.py file
> in both the modes folder and the weather subfolder, but I cannot get
> main.pyw to import weather!
>   

Show us some code and a diagram of your forcer hierarchy, and we'll look 
at it.
> 3. How does weather import from a folder above or beside it? For
> example, if a config directory is at the same level as the modes
> directory, how can weather import something from config?
>   

You don't import from up the hierarchy.  You can put a higher folder on 
sys.path, and get to it that way.

Gary Herron


> Thanks!
>
>   



From martin at v.loewis.de  Thu Mar 11 13:00:21 2010
From: martin at v.loewis.de (Martin v. Loewis)
Date: Thu, 11 Mar 2010 19:00:21 +0100
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
In-Reply-To: <mailman.619.1268324988.23598.python-list@python.org>
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>
	<mailman.619.1268324988.23598.python-list@python.org>
Message-ID: <4B992FB5.8090207@v.loewis.de>


>> I have a Windows 7 (64bit AMD) machine

This is somewhat imprecise: is it
a) that your CPU is AMD64, and thus supports 64-bit mode, or
b) that *in addition*, your Windows 7 installation is a 64-bit
installation, or
c) that *in addition*, your Python installation is also a 64-bit
   installation.

Unless you have a specific need for 64-bit mode, I recommend that you
use the 32-bit version of Windows (unless you have more than 4GB of
main memory), and (even if you have a 64-bit Windows) you install the
32-bit version of Python on it (unless you have the need to access more
than 2GB of objects in your Python applications.

>> 1. Reportlabs / Pil 32 installers - I've tried using these but they
>> can't find python. I also tried registering Python (http://effbot.org/
>> zone/python-register.htm) but this also fails.

Install the 32-bit version of Python, and these installers should work fine.

> Perhaps some expert on the python list knows which versions of VS
> support 64bit; I do have VS 2005/2008 etc, but I'll probably need to set
> up a 64bit machine to see if they will install on a 64bit architecture.

For Python 2.6 and later, use VS 2008. This comes with an AMD64
compiler. You technically don't need a 64-bit Windows, as it supports
cross-compilation (but you would need a 64-bit Windows to test it).

I personally build Python on a 32-bit machine, and move the MSI to a
64-bit machine for testing.

Regards,
Martin


From steve at holdenweb.com  Thu Mar 11 13:10:48 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 11 Mar 2010 13:10:48 -0500
Subject: importing modules from subdirs
In-Reply-To: <bc7f680c1003110951p7d1253d9nb8b67e47f41d3970@mail.gmail.com>
References: <bc7f680c1003110951p7d1253d9nb8b67e47f41d3970@mail.gmail.com>
Message-ID: <hnbbov$v4q$1@dough.gmane.org>

Alex Hall wrote:
> Hi all,
> The manual says, for modules in a project stored in subdirectories, you can do:
> import folderName.module
> 
> I have a couple questions, though:
> 1. Do I then have to call functions from module like
> folder.module.function, or can I still use the normal module.function?
> 
> 2. When I try to do this, it fails. I have an sw folder. Inside that I
> have a modes folder, holding weather.pyw. Main.pyw, back in the sw
> folder, is trying to import modes.weather, but nothing happens. I have
> tried putting weather.pyw in its own weather folder under the modes
> folder, but that also fails. I have placed an empty __init__.py file
> in both the modes folder and the weather subfolder, but I cannot get
> main.pyw to import weather!
> 
> 3. How does weather import from a folder above or beside it? For
> example, if a config directory is at the same level as the modes
> directory, how can weather import something from config?
> 
> Thanks!
> 
I haven't checked this, but I believe .pyw names are only for main
programs. Try renaming weather.pyw as weather.py and see if it makes any
difference.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From drobinow at gmail.com  Thu Mar 11 13:14:01 2010
From: drobinow at gmail.com (David Robinow)
Date: Thu, 11 Mar 2010 13:14:01 -0500
Subject: use of multiple versions of python
In-Reply-To: <581ce2791003102140t7fd470e5obcad20ec714f60f3@mail.gmail.com>
References: <581ce2791003102140t7fd470e5obcad20ec714f60f3@mail.gmail.com>
Message-ID: <4eb0089f1003111014w4f7bffack1ea409aa7a17ac2c@mail.gmail.com>

On Thu, Mar 11, 2010 at 12:40 AM, Bujji <sivaits4u at gmail.com> wrote:
> hi all,
> I have installed python 2.6 in addition to python 2.5 in my system
> Now for some modules(while installing ) it needs to use python 2.6
> how can i do that
> in case of easy_install what should i do to it to use python 2.6
 You should have an easy_install-2.5 and easy_install-2.6.  One of
them will be linked to easy_install, depending on how you did the
install. Just use the one you need.


From mehgcap at gmail.com  Thu Mar 11 13:15:38 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Thu, 11 Mar 2010 13:15:38 -0500
Subject: unable to run wxPython script: dll errors
Message-ID: <bc7f680c1003111015n7b677737l8304efae28a8c6f8@mail.gmail.com>

Hi all,
I am trying to run a file that should pop up a dialog. The dialog is
fine (I used XRCed to create it and running it from within that editor
brings up the dialog I want). When I run my file, though, I get this
traceback:

C:\Users\Alex>c:\python26\python.exe i:\arm\dictionary.py
Traceback (most recent call last):
  File "i:\arm\dictionary.py", line 2, in <module>
    import wx
  File "c:\python26\lib\site-packages\wx-2.8-msw-unicode\wx\__init__.py", line 4
5, in <module>
    from wx._core import *
  File "c:\python26\lib\site-packages\wx-2.8-msw-unicode\wx\_core.py", line 4, i
n <module>
    import _core_
ImportError: DLL load failed: The specified procedure could not be found.

I am running win7x64, wxPython2.8, python2.6. Any ideas why this would
be happening? I found a forum post that talked about a manifest file
and some dll files being needed, but it did not make a lot of sense.
Thanks!


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From gagsl-py2 at yahoo.com.ar  Thu Mar 11 13:28:15 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 11 Mar 2010 15:28:15 -0300
Subject: Python Script to get Info from Site not working
References: <993c3089-0f96-4f37-b42a-111731045b2d@k24g2000pro.googlegroups.com>
	<mailman.592.1268273109.23598.python-list@python.org>
	<396ffb5b-8548-4e4d-8245-a53ecb3cff23@k24g2000pro.googlegroups.com>
Message-ID: <op.u9e1ldhkx6zn5v@lepton.softlabbsas.com.ar>

En Wed, 10 Mar 2010 23:26:05 -0300, Jimbo <nilly16 at yahoo.com> escribi?:

> On Mar 11, 12:38 pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
>> En Wed, 10 Mar 2010 20:06:41 -0300, Jimbo <nill... at yahoo.com> escribi?:
>>
>> > I found a semi Python & internet tutorial here if anyone else would
>> > like ithttp://www.upriss.org.uk/python/session6.html
>>
>> Replace the last line with something like this, to see what you are  
>> getting exactly:
>>
>>         print("Sorry, no %r (%r) available." % (
>>            drink,
>>            cgi.escape(repr(type(drink)))))
>>
>> BTW, which Python version are you using? The tutorial you linked to is  
>> aimed at Python 2.x, but your print syntax suggests you're using Python  
>> 3.x

> I am using 3.x, do you think I should be using something else?

Yes, you should use the same version as the tutorial you're following.
Learning how to program, CGI, HTML and Python at the same time is hard
enough to complicate it with incompatible version differences. I suggest
Python 2.6.4

> Also
> the your code I put in does the some thing, just now it says "Sorry no
> none drink available" all the time.

As a general rule, always directly copy and paste the error messages you
get and the source code you execute. Do not retype or paraphrase them.
That's important for the rest of us to be able to help you - now and in
the future.

In this case, the message should read "Sorry, no None (<type 'NoneType'>)
available." (None, not none, is a built-in special object in Python). So
we know that drink is None instead of one of the expected values, and we
could start investigating why. But there is no point in digging further -
instead, downgrade to Python 2.6.4 and try again.
This might be a server issue, unrelated to your script. BTW, you didn't
mention the server software.

-- 
Gabriel Genellina



From ludolph at openhazel.co.za  Thu Mar 11 13:38:56 2010
From: ludolph at openhazel.co.za (Ludolph)
Date: Thu, 11 Mar 2010 20:38:56 +0200
Subject: Visual Python programming and decompilers?
Message-ID: <95cccfc91003111038y6f07efb2m623122a3b8a60127@mail.gmail.com>

Hi Guys

At work I have been exposed to a Agile Platform called OutSystems. It
allows you to visually program your web applications
http://i.imgur.com/r2F0i.png and I find the idea very intriguing.

So I have started to play around with the idea on how will I be able
to visually represent Python code as in the above image and then allow
the programmer to change some of the flow/code/logic visually and then
get it back as python source code. I don't know if this have been
tried before and after some googling I can't find anything like this,
so maybe I'm just lacking basic googling skills or a python solution
like the above does not exist yet.

If anybody knows of such solution please let me know, so that I don't
spend a lot of time recreating the wheel. Otherwise help me out on the
following problem:

I decided I can use byteplay3 http://pypi.python.org/pypi/byteplay/ to
disassemble the code to workable objects, It even allows me to rebuild
the objects to bytecode. So if I define patterns on how python
interrupts the source code to bytecode I can visually represent this
and also so convert my visual representations back to bytecode.

The only problem I have at the moment is how will I get this bytecode
back to python source code. I have googled for python decompiler but
only found old projects like unpyc, decompyle and some online
services. I would like to know if anybody know of a well maintained or
at least recent module that can help me accomplish the above
mentioned, because I'm hoping I can implement this in Python 3.1.

So any input or suggestion would be greatly appreciated.

Kind Regards,

-- 
Ludolph Neethling


From gagsl-py2 at yahoo.com.ar  Thu Mar 11 13:45:03 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 11 Mar 2010 15:45:03 -0300
Subject: Get a method instance through 'getattr' but not superclass's
	method
References: <e28756ee1003102047i2f60dbbev708e1cfa7a240f7f@mail.gmail.com>
Message-ID: <op.u9e2dd2fx6zn5v@lepton.softlabbsas.com.ar>

En Thu, 11 Mar 2010 01:47:30 -0300, Radhakrishna Bhat
<radhakrishna12 at gmail.com> escribi?:

> I am using getattr to get a method instance from a class. But it also
> returns methods from the superclass. How to detect if an attribute is  
> from
> superclass?

You may look it up directly in the class dictionary (__dict__)

-- 
Gabriel Genellina



From kevin.p.dwyer at gmail.com  Thu Mar 11 13:54:41 2010
From: kevin.p.dwyer at gmail.com (Kev Dwyer)
Date: Thu, 11 Mar 2010 18:54:41 +0000 (UTC)
Subject: Python 2.6 and modules dbi AND odbc
References: <2fb4a5011003101617r5518b322y6ccc091046b0ccc4@mail.gmail.com>
Message-ID: <hnbe9h$58d$1@dough.gmane.org>

On Wed, 10 Mar 2010 16:17:29 -0800, robert somerville wrote:

> hi;
>  i am trying to get some legacy python code (which i no nothing about)
> working with tries to import dbi and odbc (the import fails ...) it
> looks like these modules are deprecated ?? if so is there a work around
> , if not deprecated, what am i doing wrong ?? i see no Ubuntu packages
> that look promising ..
 
Hello Robert,

These modules are distributed as part of the PyWin32 Python for Windows
 extensions, so they need to run on a Windows box.  They'll run fine 
there regardless of the deprecation of dbi (though "import dbi" will 
provide a useful warning message).

Pyodbc is a possible alternative.

Cheers,

Kev



From CalWhoNOSPAM at roadrunner.com  Thu Mar 11 13:56:08 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Thu, 11 Mar 2010 13:56:08 -0500
Subject: I get the error:    ImportError: No module named ffnet
References: <hnb339$g2g$1@news.eternal-september.org>
Message-ID: <hnbeca$6k1$1@news.eternal-september.org>

I found out I had something installed wrong.

" Cal Who" <CalWhoNOSPAM at roadrunner.com> wrote in message 
news:hnb339$g2g$1 at news.eternal-september.org...
>
>
> I have the .py file in Eclipse
> #@PydevCodeAnalysisIgnore
> from ffnet import ffnet, mlgraph
> topology = mlgraph( (2, 3, 1) )
> nn = ffnet(topology)
>
> I select RunAs / Python Run
>
> I get the error
> from ffnet import ffnet, mlgraph
> ImportError: No module named ffnet
>
> In the folder Python26\lib\site-packages I see
> ffnet-0.6.2-py2.6.egg-info
>
> also a folder ffnet
> in that folder there is a folder Examples
> If I click one of the examples pyrhon.exe opens and runs it OK.
>
> Is there enough in the above for you to tell me how to procede?
>
> Thanks in advance for any help at all
>
>
> 




From jcb at iteris.com  Thu Mar 11 14:01:39 2010
From: jcb at iteris.com (Metalone)
Date: Thu, 11 Mar 2010 11:01:39 -0800 (PST)
Subject: file seek is slow
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>
	<daf5c75e-8139-4a4a-8c27-5cef00327bb1@o3g2000yqb.googlegroups.com> 
	<d86f1068-8cd4-4489-af00-450d407baf41@g28g2000prb.googlegroups.com> 
	<RwVln.12295$pv.5770@news-server.bigpond.net.au>
	<e8a9a95f-77b3-43ce-8110-8c6babaa6f26@z4g2000yqa.googlegroups.com>
Message-ID: <781d69b1-c5e1-4013-9015-4983dbfaa4d7@k6g2000prg.googlegroups.com>

I am assuming that Python delegates the f.seek call to the seek call
in the MS C runtime library msvcrt.dll.
Does anybody know a nice link to the Python source like was posted
above for the BSD 'C' library?

Ok, I ran some more tests.
C, seek            : 0.812 seconds   // test from original post
Python, f.seek     : 1.458 seconds.  // test from original post

C, time(&tm)       : 0.671 seconds
Python, time.time(): 0.513 seconds.
Python, ctypes.msvcrt.time(ctypes.byref(tm)): 0.971 seconds.   #
factored the overhead to be outside the loop, so really this was
func_ptr(ptr).

Perhaps I am just comparing apples to oranges.
I never tested the overhead of ctypes like this before.
Most of my problem timings involve calls through ctypes.


From CalWhoNOSPAM at roadrunner.com  Thu Mar 11 14:01:39 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Thu, 11 Mar 2010 14:01:39 -0500
Subject: Where can I find documentation for data[:,9]
Message-ID: <hnbemp$7p0$1@news.eternal-september.org>

data = readdata( 'data/input.dat', delimiter = ',' )

input = data[:, :9]#nine data columns



Where can I find documentation for the

data[:,9]

in the code above.

Been looking and found many examples but would like to know the definition.

I need to skip the first column and then read 9



I would also like to print the data in ihe variable "input"



Thanks




From robert.kern at gmail.com  Thu Mar 11 14:22:21 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 11 Mar 2010 13:22:21 -0600
Subject: Where can I find documentation for data[:,9]
In-Reply-To: <hnbemp$7p0$1@news.eternal-september.org>
References: <hnbemp$7p0$1@news.eternal-september.org>
Message-ID: <hnbfte$iac$1@dough.gmane.org>

On 2010-03-11 13:01 PM,  Cal Who wrote:
> data = readdata( 'data/input.dat', delimiter = ',' )
>
> input = data[:, :9]#nine data columns
>
>
>
> Where can I find documentation for the
>
> data[:,9]
>
> in the code above.
>
> Been looking and found many examples but would like to know the definition.

When asking questions like this, it helps *a lot* to provide a complete example, 
not just a snippet. If I weren't already intimately familiar with the library 
you are using, I would have no idea how to help you.

However, I do know that input object is a numpy array, and the syntax you are 
asking about is multidimensional slicing.

http://docs.scipy.org/doc/numpy/reference/arrays.indexing.html

> I need to skip the first column and then read 9

data[:, 1:10]

> I would also like to print the data in ihe variable "input"

print input

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From misceverything at gmail.com  Thu Mar 11 14:29:53 2010
From: misceverything at gmail.com (T)
Date: Thu, 11 Mar 2010 11:29:53 -0800 (PST)
Subject: Parsing Email Headers
Message-ID: <e574cbf6-d7e8-49e8-be87-93c9a59e3d87@z35g2000yqd.googlegroups.com>

All I'm looking to do is to download messages from a POP account and
retrieve the sender and subject from their headers.  Right now I'm 95%
of the way there, except I can't seem to figure out how to *just* get
the headers.  Problem is, certain email clients also include headers
in the message body (i.e. if you're replying to a message), and these
are all picked up as additional senders/subjects.  So, I want to avoid
processing anything from the message body.

Here's a sample of what I have:

                # For each line in message
                for j in M.retr(i+1)[1]:
                    # Create email message object from returned string
                    emailMessage = email.message_from_string(j)
                    # Get fields
                    fields = emailMessage.keys()
                    # If email contains "From" field
                    if emailMessage.has_key("From"):
                        # Get contents of From field
                        from_field = emailMessage.__getitem__("From")

I also tried using the following, but got the same results:
                 emailMessage =
email.Parser.HeaderParser().parsestr(j, headersonly=True)

Any help would be appreciated!


From mehgcap at gmail.com  Thu Mar 11 14:56:12 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Thu, 11 Mar 2010 14:56:12 -0500
Subject: importing modules from subdirs
In-Reply-To: <hnbbov$v4q$1@dough.gmane.org>
References: <bc7f680c1003110951p7d1253d9nb8b67e47f41d3970@mail.gmail.com>
	<hnbbov$v4q$1@dough.gmane.org>
Message-ID: <bc7f680c1003111156s3495596ak46c87efe27246378@mail.gmail.com>

Halfway there. It imports now, but it says that the module does not
have functions which I know it does have. I will just leave it all in
one folder for now and play with organization after I get the project
working better.

On 3/11/10, Steve Holden <steve at holdenweb.com> wrote:
> Alex Hall wrote:
>> Hi all,
>> The manual says, for modules in a project stored in subdirectories, you
>> can do:
>> import folderName.module
>>
>> I have a couple questions, though:
>> 1. Do I then have to call functions from module like
>> folder.module.function, or can I still use the normal module.function?
>>
>> 2. When I try to do this, it fails. I have an sw folder. Inside that I
>> have a modes folder, holding weather.pyw. Main.pyw, back in the sw
>> folder, is trying to import modes.weather, but nothing happens. I have
>> tried putting weather.pyw in its own weather folder under the modes
>> folder, but that also fails. I have placed an empty __init__.py file
>> in both the modes folder and the weather subfolder, but I cannot get
>> main.pyw to import weather!
>>
>> 3. How does weather import from a folder above or beside it? For
>> example, if a config directory is at the same level as the modes
>> directory, how can weather import something from config?
>>
>> Thanks!
>>
> I haven't checked this, but I believe .pyw names are only for main
> programs. Try renaming weather.pyw as weather.py and see if it makes any
> difference.
>
> regards
>  Steve
> --
> Steve Holden           +1 571 484 6266   +1 800 494 3119
> See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
> Holden Web LLC                 http://www.holdenweb.com/
> UPCOMING EVENTS:        http://holdenweb.eventbrite.com/
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From python at mrabarnett.plus.com  Thu Mar 11 15:13:48 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 11 Mar 2010 20:13:48 +0000
Subject: Parsing Email Headers
In-Reply-To: <e574cbf6-d7e8-49e8-be87-93c9a59e3d87@z35g2000yqd.googlegroups.com>
References: <e574cbf6-d7e8-49e8-be87-93c9a59e3d87@z35g2000yqd.googlegroups.com>
Message-ID: <4B994EFC.4060400@mrabarnett.plus.com>

T wrote:
> All I'm looking to do is to download messages from a POP account and
> retrieve the sender and subject from their headers.  Right now I'm 95%
> of the way there, except I can't seem to figure out how to *just* get
> the headers.  Problem is, certain email clients also include headers
> in the message body (i.e. if you're replying to a message), and these
> are all picked up as additional senders/subjects.  So, I want to avoid
> processing anything from the message body.
> 
> Here's a sample of what I have:
> 
>                 # For each line in message
>                 for j in M.retr(i+1)[1]:
>                     # Create email message object from returned string
>                     emailMessage = email.message_from_string(j)
>                     # Get fields
>                     fields = emailMessage.keys()
>                     # If email contains "From" field
>                     if emailMessage.has_key("From"):
>                         # Get contents of From field
>                         from_field = emailMessage.__getitem__("From")
> 
> I also tried using the following, but got the same results:
>                  emailMessage =
> email.Parser.HeaderParser().parsestr(j, headersonly=True)
> 
> Any help would be appreciated!

If you're using poplib then use ".top" instead of ".retr".


From debatem1 at gmail.com  Thu Mar 11 15:16:26 2010
From: debatem1 at gmail.com (geremy condra)
Date: Thu, 11 Mar 2010 15:16:26 -0500
Subject: Visual Python programming and decompilers?
In-Reply-To: <95cccfc91003111038y6f07efb2m623122a3b8a60127@mail.gmail.com>
References: <95cccfc91003111038y6f07efb2m623122a3b8a60127@mail.gmail.com>
Message-ID: <f3cc57c61003111216g70a16aaqaae9d26ead064f0c@mail.gmail.com>

On Thu, Mar 11, 2010 at 1:38 PM, Ludolph <ludolph at openhazel.co.za> wrote:
> Hi Guys
>
> At work I have been exposed to a Agile Platform called OutSystems. It
> allows you to visually program your web applications
> http://i.imgur.com/r2F0i.png and I find the idea very intriguing.
>
> So I have started to play around with the idea on how will I be able
> to visually represent Python code as in the above image and then allow
> the programmer to change some of the flow/code/logic visually and then
> get it back as python source code. I don't know if this have been
> tried before and after some googling I can't find anything like this,
> so maybe I'm just lacking basic googling skills or a python solution
> like the above does not exist yet.
>
> If anybody knows of such solution please let me know, so that I don't
> spend a lot of time recreating the wheel. Otherwise help me out on the
> following problem:
>
> I decided I can use byteplay3 http://pypi.python.org/pypi/byteplay/ to
> disassemble the code to workable objects, It even allows me to rebuild
> the objects to bytecode. So if I define patterns on how python
> interrupts the source code to bytecode I can visually represent this
> and also so convert my visual representations back to bytecode.
>
> The only problem I have at the moment is how will I get this bytecode
> back to python source code. I have googled for python decompiler but
> only found old projects like unpyc, decompyle and some online
> services. I would like to know if anybody know of a well maintained or
> at least recent module that can help me accomplish the above
> mentioned, because I'm hoping I can implement this in Python 3.1.
>
> So any input or suggestion would be greatly appreciated.
>
> Kind Regards,
>
> --
> Ludolph Neethling
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Maybe something like http://www.pypes.org/?

They were at pycon and sounded pretty into what they were
talking about- I'd send them an email.

Geremy Condra


From stef.mientki at gmail.com  Thu Mar 11 15:17:09 2010
From: stef.mientki at gmail.com (Stef Mientki)
Date: Thu, 11 Mar 2010 21:17:09 +0100
Subject: Visual Python programming and decompilers?
In-Reply-To: <95cccfc91003111038y6f07efb2m623122a3b8a60127@mail.gmail.com>
References: <95cccfc91003111038y6f07efb2m623122a3b8a60127@mail.gmail.com>
Message-ID: <4B994FC5.1030106@gmail.com>

On 11-03-2010 19:38, Ludolph wrote:
> Hi Guys
>
> At work I have been exposed to a Agile Platform called OutSystems. It
> allows you to visually program your web applications
> http://i.imgur.com/r2F0i.png and I find the idea very intriguing.
>
>    
Although not as low level as you want,
http://mientki.ruhosting.nl/data_www/pylab_works/pw_animations_screenshots.html
http://code.google.com/p/pylab-works/
and here an overview of similar packages

cheers,
Stef


From invalid at invalid.invalid  Thu Mar 11 15:20:56 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Thu, 11 Mar 2010 20:20:56 +0000 (UTC)
Subject: Parsing Email Headers
References: <e574cbf6-d7e8-49e8-be87-93c9a59e3d87@z35g2000yqd.googlegroups.com>
Message-ID: <hnbjb8$6ce$3@reader1.panix.com>

On 2010-03-11, T <misceverything at gmail.com> wrote:
> All I'm looking to do is to download messages from a POP account and
> retrieve the sender and subject from their headers.  Right now I'm 95%
> of the way there, except I can't seem to figure out how to *just* get
> the headers.

The headers are saparated from the body by a blank line.

> Problem is, certain email clients also include headers in the message
> body (i.e. if you're replying to a message), and these are all picked
> up as additional senders/subjects.  So, I want to avoid processing
> anything from the message body.

Then stop when you see a blank line.

Or retreive just the headers.

-- 
Grant Edwards               grant.b.edwards        Yow! My life is a patio
                                  at               of fun!
                              gmail.com            


From astley.lejasper at gmail.com  Thu Mar 11 15:57:07 2010
From: astley.lejasper at gmail.com (Astley Le Jasper)
Date: Thu, 11 Mar 2010 12:57:07 -0800 (PST)
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>
	<mailman.619.1268324988.23598.python-list@python.org>
	<4B992FB5.8090207@v.loewis.de>
Message-ID: <72a0d93e-50f8-415b-aa74-5d7abe6d8523@z11g2000yqz.googlegroups.com>

@Robin
Thanks. I thought that this seemed to be a general python thing
because it was effecting both installs. However, after also reading
Martin's comments ...

@Martin
> This is somewhat imprecise: is it
> a) that your CPU is AMD64, and thus supports 64-bit mode, or
> b) that *in addition*, your Windows 7 installation is a 64-bit
> installation, or
> c) that *in addition*, your Python installation is also a 64-bit
>    installation.
>
> Unless you have a specific need for 64-bit mode, I recommend that you
> use the 32-bit version of Windows (unless you have more than 4GB of
> main memory), and (even if you have a 64-bit Windows) you install the
> 32-bit version of Python on it (unless you have the need to access more
> than 2GB of objects in your Python applications.


Sorry. I have Windows 7 (64-bit) installed on a machine with an AMD
cpu (which supports 64-bit mode), with a 64-bit version of
(Activestate) python 2.6 .... although I didn't realise the later
until I looked just now.

> Install the 32-bit version of Python, and these installers should work fine.
Well, I uninstalled the 64-bit version and the installers did indeed
work.

I?m sorry everyone. I didn?t realise I had installed the 64-bit
version of Python. Well, at least someone else might find have the
same problem. But I think that there is going to be a bit of a rough
patch as everyone moves over to 64-bit.

ALJ


From greg.ewing at canterbury.ac.nz  Thu Mar 11 16:40:33 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Fri, 12 Mar 2010 10:40:33 +1300
Subject: Reverse engineering CRC?
In-Reply-To: <3b1dce65-99ed-471a-8494-9eaf0e6d44ad@e19g2000prn.googlegroups.com>
References: <7vj7fdFnnjU1@mid.individual.net>
	<3b1dce65-99ed-471a-8494-9eaf0e6d44ad@e19g2000prn.googlegroups.com>
Message-ID: <7vt5n8FetlU1@mid.individual.net>

Steve Howell wrote:

> Hi Greg.  I would at least flip one bit at a time on the first byte of
> your data to see if the transformation is bitwise.

I'm actually making good progress on this -- it turns out
there *is* a way of deducing the polynomial by looking at
the effect of single-bit flips. It's actually quite simple,
with no brute-force searching needed at all.

Things get a bit tricky when you don't quite know all
of the data that goes into the CRC, though, which seems
to be the case here...

I'm writing up an essay on my experiences. I'll post a
link when it's finished.

-- 
Greg


From CalWhoNOSPAM at roadrunner.com  Thu Mar 11 17:08:36 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Thu, 11 Mar 2010 17:08:36 -0500
Subject: Where can I find documentation for data[:,9]
References: <hnbemp$7p0$1@news.eternal-september.org>
	<mailman.631.1268335358.23598.python-list@python.org>
Message-ID: <hnbpl7$iqr$1@news.eternal-september.org>


"Robert Kern" <robert.kern at gmail.com> wrote in message 
news:mailman.631.1268335358.23598.python-list at python.org...
> On 2010-03-11 13:01 PM,  Cal Who wrote:
>> data = readdata( 'data/input.dat', delimiter = ',' )
>>
>> input = data[:, :9]#nine data columns
>>
>>
>>
>> Where can I find documentation for the
>>
>> data[:,9]
>>
>> in the code above.
>>
>> Been looking and found many examples but would like to know the 
>> definition.
>
> When asking questions like this, it helps *a lot* to provide a complete 
> example, not just a snippet. If I weren't already intimately familiar with 
> the library you are using, I would have no idea how to help you.
>
> However, I do know that input object is a numpy array, and the syntax you 
> are asking about is multidimensional slicing.
>
> http://docs.scipy.org/doc/numpy/reference/arrays.indexing.html
>
>> I need to skip the first column and then read 9
>
> data[:, 1:10]
>
>> I would also like to print the data in ihe variable "input"
>
> print input
>
> -- 
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless 
> enigma
>  that is made terrible by our own mad attempt to interpret it as though it 
> had
>  an underlying truth."
>   -- Umberto Eco
>
Thanks, that helped a lot.

I'm having trouble knowing what to search for to find documenatation. For 
example, is print a Python command, a numpy command or a java command?

I like to read the documentation even if the command is working for me.


Thanks again 




From martin.hellwig at dcuktec.org  Thu Mar 11 17:19:09 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Thu, 11 Mar 2010 22:19:09 +0000
Subject: Where can I find documentation for data[:,9]
In-Reply-To: <hnbpl7$iqr$1@news.eternal-september.org>
References: <hnbemp$7p0$1@news.eternal-september.org>
	<mailman.631.1268335358.23598.python-list@python.org>
	<hnbpl7$iqr$1@news.eternal-september.org>
Message-ID: <hnbq8q$vgm$1@news.eternal-september.org>

On 03/11/10 22:08,  Cal Who wrote:
<cut>
> Thanks, that helped a lot.
>
> I'm having trouble knowing what to search for to find documenatation. For
> example, is print a Python command, a numpy command or a java command?
>
> I like to read the documentation even if the command is working for me.
>
>
> Thanks again
>
>
Probably for you the right way would be to familiarize yourself with the 
namespace concept of Python, this makes it easier to identify whether 
something is built-in, a standard module or an external module.
Which makes it much easier to feed google the right clues.

-- 
mph


From misceverything at gmail.com  Thu Mar 11 17:44:09 2010
From: misceverything at gmail.com (T)
Date: Thu, 11 Mar 2010 14:44:09 -0800 (PST)
Subject: Parsing Email Headers
References: <e574cbf6-d7e8-49e8-be87-93c9a59e3d87@z35g2000yqd.googlegroups.com>
	<mailman.633.1268338431.23598.python-list@python.org>
Message-ID: <91153e11-2980-4218-bc88-c92bda7d517e@z11g2000yqz.googlegroups.com>

On Mar 11, 3:13?pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
> T wrote:
> > All I'm looking to do is to download messages from a POP account and
> > retrieve the sender and subject from their headers. ?Right now I'm 95%
> > of the way there, except I can't seem to figure out how to *just* get
> > the headers. ?Problem is, certain email clients also include headers
> > in the message body (i.e. if you're replying to a message), and these
> > are all picked up as additional senders/subjects. ?So, I want to avoid
> > processing anything from the message body.
>
> > Here's a sample of what I have:
>
> > ? ? ? ? ? ? ? ? # For each line in message
> > ? ? ? ? ? ? ? ? for j in M.retr(i+1)[1]:
> > ? ? ? ? ? ? ? ? ? ? # Create email message object from returned string
> > ? ? ? ? ? ? ? ? ? ? emailMessage = email.message_from_string(j)
> > ? ? ? ? ? ? ? ? ? ? # Get fields
> > ? ? ? ? ? ? ? ? ? ? fields = emailMessage.keys()
> > ? ? ? ? ? ? ? ? ? ? # If email contains "From" field
> > ? ? ? ? ? ? ? ? ? ? if emailMessage.has_key("From"):
> > ? ? ? ? ? ? ? ? ? ? ? ? # Get contents of From field
> > ? ? ? ? ? ? ? ? ? ? ? ? from_field = emailMessage.__getitem__("From")
>
> > I also tried using the following, but got the same results:
> > ? ? ? ? ? ? ? ? ?emailMessage =
> > email.Parser.HeaderParser().parsestr(j, headersonly=True)
>
> > Any help would be appreciated!
>
> If you're using poplib then use ".top" instead of ".retr".

I'm still having the same issue, even with .top.  Am I missing
something?

                for j in M.top(i+1, 0)[1]:
                    emailMessage = email.message_from_string(j)
                    #emailMessage =
email.Parser.HeaderParser().parsestr(j, headersonly=True)
                    # Get fields
                    fields = emailMessage.keys()
                    # If email contains "From" field
                    if emailMessage.has_key("From"):
                        # Get contents of From field
                        from_field = emailMessage.__getitem__("From")

Is there another way I should be using to retrieve only the headers
(not those in the body)?


From martin.hellwig at dcuktec.org  Thu Mar 11 17:46:57 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Thu, 11 Mar 2010 22:46:57 +0000
Subject: Platform Requirement Checker (was Does this already exists?: A module
	that checks if the used platform is supported)
In-Reply-To: <mailman.588.1268271605.23598.python-list@python.org>
References: <hn88ag$b5m$1@news.eternal-september.org>
	<mailman.588.1268271605.23598.python-list@python.org>
Message-ID: <hnbrsu$b8g$1@news.eternal-september.org>

On 03/11/10 01:37, Gabriel Genellina wrote:
> En Wed, 10 Mar 2010 10:54:27 -0300, Martin P. Hellwig
> <martin.hellwig at dcuktec.org> escribi?:
>
>> Before I start reinventing a squared wheel, I have the following
>> question:
>> Is there already a (standard) module that wraps around the various
>> os/sys information which checks if the platform + version is supported
>> for what I want to do with it.
>
> In case you were not aware of it: see the platform module. But you'll have
> to do the checks yourself (based on the info it returns).
>
Thanks for the reminder, it indeed slipped my mind.

As Python features are luckily mostly platform independent, I am not 
sure if a convenient 'platform requirement check' module would be worth 
the energy creating it, any thoughts on that?

For clarity purpose I re'added (and adapted) in what lines I was thinking:
-
test = RequirePlatform(do_not_raise=True)
# If do_not_raise is not set or False, an error will be raised
# after a failed require line, otherwise just continue.

test.require(key='test1', platform='freebsd', version_min='2.2')
# If the platform is anything else but FreeBSD 2.2 onwards return False
# and store the result of the test.
# Result of the require (and any additional tests
# can be accessed using the index operators;

if test['test1']:
     print('supported')
-
Other requirements like architecture, python vm type/version, cpu 
features, etc. Might also be nice to have.


-- 
mph


From CalWhoNOSPAM at roadrunner.com  Thu Mar 11 17:52:21 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Thu, 11 Mar 2010 17:52:21 -0500
Subject: Where can I find documentation for data[:,9]
References: <hnbemp$7p0$1@news.eternal-september.org>
	<mailman.631.1268335358.23598.python-list@python.org>
	<hnbpl7$iqr$1@news.eternal-september.org>
	<hnbq8q$vgm$1@news.eternal-september.org>
Message-ID: <hnbs79$sds$1@news.eternal-september.org>


"Martin P. Hellwig" <martin.hellwig at dcuktec.org> wrote in message 
news:hnbq8q$vgm$1 at news.eternal-september.org...
> On 03/11/10 22:08,  Cal Who wrote:
> <cut>
>> Thanks, that helped a lot.
>>
>> I'm having trouble knowing what to search for to find documenatation. For
>> example, is print a Python command, a numpy command or a java command?
>>
>> I like to read the documentation even if the command is working for me.
>>
>>
>> Thanks again
>>
>>
> Probably for you the right way would be to familiarize yourself with the 
> namespace concept of Python, this makes it easier to identify whether 
> something is built-in, a standard module or an external module.
> Which makes it much easier to feed google the right clues.
>
> -- 
> mph

Thanks a lot, I'll look that up now. 




From jcb at iteris.com  Thu Mar 11 17:57:28 2010
From: jcb at iteris.com (Metalone)
Date: Thu, 11 Mar 2010 14:57:28 -0800 (PST)
Subject: file seek is slow
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>
	<daf5c75e-8139-4a4a-8c27-5cef00327bb1@o3g2000yqb.googlegroups.com> 
	<d86f1068-8cd4-4489-af00-450d407baf41@g28g2000prb.googlegroups.com> 
	<RwVln.12295$pv.5770@news-server.bigpond.net.au>
	<e8a9a95f-77b3-43ce-8110-8c6babaa6f26@z4g2000yqa.googlegroups.com>
	<781d69b1-c5e1-4013-9015-4983dbfaa4d7@k6g2000prg.googlegroups.com>
Message-ID: <5fab36b5-8f04-4e17-98c0-67aab24bb239@u19g2000prh.googlegroups.com>

I just tried the seek test with Cython.
Cython fseek() : 1.059 seconds.  30% slower than 'C'
Python f.seek  : 1.458 secondds. 80% slower than 'C'.

It is amazing to me that Cython generates a 'C' file that is 1478
lines.


#Cython code

import time

cdef int SEEK_SET = 0

cdef extern from "stdio.h":
    void* fopen(char* filename, char* mode)
    int fseek(void*, long, int)

def main():
    cdef void* f1 = fopen('video.txt', 'rb')
    cdef int i=1000000
    t0 = time.clock()
    while i > 0:
       fseek(f1, 0, SEEK_SET)
       i -= 1
    delta = time.clock() - t0
    print "%.3f" % delta

if __name__ == '__main__':
    main()


From felix.antoine.fortin at gmail.com  Thu Mar 11 18:05:00 2010
From: felix.antoine.fortin at gmail.com (=?ISO-8859-1?Q?F=E9lix=2DAntoine_Fortin?=)
Date: Thu, 11 Mar 2010 15:05:00 -0800 (PST)
Subject: inspect.stack() and frame
Message-ID: <6f3a93d6-5608-467f-a7db-d360a34fe856@i25g2000yqm.googlegroups.com>

Given this code :
# Experience with frame
import sys
import inspect

def foo():
    stack = inspect.stack()
    print "foo frame : " + str(hex(id(sys._getframe())))

def foo2():
    inspect.stack()
    print "foo2 frame : " + str(hex(id(sys._getframe())))

def bar():
    print "bar frame : " + str(hex(id(sys._getframe())))

foo()
foo()

foo2()
foo2()

bar()
bar()

Output example :
foo frame : 0x84d2c0
foo frame : 0x844bf0
foo2 frame : 0x898c90
foo2 frame : 0x898c90
bar frame : 0x898f70
bar frame : 0x898f70

Why are the ids (address) of the frame for each foo call not the same?
Or why the call to "stack = inspect.stack()" change the address of the
frame?


From python at mrabarnett.plus.com  Thu Mar 11 18:06:40 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 11 Mar 2010 23:06:40 +0000
Subject: Parsing Email Headers
In-Reply-To: <91153e11-2980-4218-bc88-c92bda7d517e@z11g2000yqz.googlegroups.com>
References: <e574cbf6-d7e8-49e8-be87-93c9a59e3d87@z35g2000yqd.googlegroups.com>	<mailman.633.1268338431.23598.python-list@python.org>
	<91153e11-2980-4218-bc88-c92bda7d517e@z11g2000yqz.googlegroups.com>
Message-ID: <4B997780.4000009@mrabarnett.plus.com>

T wrote:
> On Mar 11, 3:13 pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
>> T wrote:
>>> All I'm looking to do is to download messages from a POP account and
>>> retrieve the sender and subject from their headers.  Right now I'm 95%
>>> of the way there, except I can't seem to figure out how to *just* get
>>> the headers.  Problem is, certain email clients also include headers
>>> in the message body (i.e. if you're replying to a message), and these
>>> are all picked up as additional senders/subjects.  So, I want to avoid
>>> processing anything from the message body.
>>> Here's a sample of what I have:
>>>                 # For each line in message
>>>                 for j in M.retr(i+1)[1]:
>>>                     # Create email message object from returned string
>>>                     emailMessage = email.message_from_string(j)
>>>                     # Get fields
>>>                     fields = emailMessage.keys()
>>>                     # If email contains "From" field
>>>                     if emailMessage.has_key("From"):
>>>                         # Get contents of From field
>>>                         from_field = emailMessage.__getitem__("From")
>>> I also tried using the following, but got the same results:
>>>                  emailMessage =
>>> email.Parser.HeaderParser().parsestr(j, headersonly=True)
>>> Any help would be appreciated!
>> If you're using poplib then use ".top" instead of ".retr".
> 
> I'm still having the same issue, even with .top.  Am I missing
> something?
> 
>                 for j in M.top(i+1, 0)[1]:
>                     emailMessage = email.message_from_string(j)
>                     #emailMessage =
> email.Parser.HeaderParser().parsestr(j, headersonly=True)
>                     # Get fields
>                     fields = emailMessage.keys()
>                     # If email contains "From" field
>                     if emailMessage.has_key("From"):
>                         # Get contents of From field
>                         from_field = emailMessage.__getitem__("From")
> 
> Is there another way I should be using to retrieve only the headers
> (not those in the body)?

The documentation does say:

   """unfortunately, TOP is poorly specified in the RFCs and is
frequently broken in off-brand servers."""

All I can say is that it works for me with my ISP! :-)


From python at mrabarnett.plus.com  Thu Mar 11 18:09:05 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 11 Mar 2010 23:09:05 +0000
Subject: Platform Requirement Checker (was Does this already exists?:
	A module	that checks if the used platform is supported)
In-Reply-To: <hnbrsu$b8g$1@news.eternal-september.org>
References: <hn88ag$b5m$1@news.eternal-september.org>	<mailman.588.1268271605.23598.python-list@python.org>
	<hnbrsu$b8g$1@news.eternal-september.org>
Message-ID: <4B997811.3000607@mrabarnett.plus.com>

Martin P. Hellwig wrote:
> On 03/11/10 01:37, Gabriel Genellina wrote:
>> En Wed, 10 Mar 2010 10:54:27 -0300, Martin P. Hellwig
>> <martin.hellwig at dcuktec.org> escribi?:
>>
>>> Before I start reinventing a squared wheel, I have the following
>>> question:
>>> Is there already a (standard) module that wraps around the various
>>> os/sys information which checks if the platform + version is supported
>>> for what I want to do with it.
>>
>> In case you were not aware of it: see the platform module. But you'll 
>> have
>> to do the checks yourself (based on the info it returns).
>>
> Thanks for the reminder, it indeed slipped my mind.
> 
> As Python features are luckily mostly platform independent, I am not 
> sure if a convenient 'platform requirement check' module would be worth 
> the energy creating it, any thoughts on that?
> 
> For clarity purpose I re'added (and adapted) in what lines I was thinking:
> -
> test = RequirePlatform(do_not_raise=True)
> # If do_not_raise is not set or False, an error will be raised
> # after a failed require line, otherwise just continue.
> 
> test.require(key='test1', platform='freebsd', version_min='2.2')
> # If the platform is anything else but FreeBSD 2.2 onwards return False
> # and store the result of the test.
> # Result of the require (and any additional tests
> # can be accessed using the index operators;
> 
> if test['test1']:
>     print('supported')
> -
> Other requirements like architecture, python vm type/version, cpu 
> features, etc. Might also be nice to have.
> 
It might be useful for up-front checking in those platform-specific
scripts, although the platform module might already be fulfilling that
need.


From gundlach at gmail.com  Thu Mar 11 18:16:36 2010
From: gundlach at gmail.com (gundlach)
Date: Thu, 11 Mar 2010 15:16:36 -0800 (PST)
Subject: pivot() equivalent
Message-ID: <e4febcbf-4efd-4a30-948d-43bdbd207e0b@g4g2000yqa.googlegroups.com>

I *know* this already exists, but I can't remember where:

def pivot(func, seq):
  # I know, a good implementation shouldn't call func() twice per item
  return ( (x for x in seq if func(x)), (x for x in seq if not
func(x)) )

I feel like I read a thread in which this was argued to death, and I
can't find that either.

The scenario: I have a sequence of lines from a file.  I want to split
it into those lines that contain a substring, and those that don't.  I
want it to be more efficient and prettier than

with = [x for x in lines if substring in x]
without = [x for x in lines if substring not in x]

Does this exist?

TIA,
Michael


From misceverything at gmail.com  Thu Mar 11 18:19:36 2010
From: misceverything at gmail.com (T)
Date: Thu, 11 Mar 2010 15:19:36 -0800 (PST)
Subject: Parsing Email Headers
References: <e574cbf6-d7e8-49e8-be87-93c9a59e3d87@z35g2000yqd.googlegroups.com>
	<mailman.633.1268338431.23598.python-list@python.org>
	<91153e11-2980-4218-bc88-c92bda7d517e@z11g2000yqz.googlegroups.com>
	<mailman.636.1268348804.23598.python-list@python.org>
Message-ID: <6e0f6857-bedd-4b23-81af-69dd06a53764@q15g2000yqj.googlegroups.com>

Thanks for your suggestions!  Here's what seems to be working - it's
basically the same thing I originally had, but first checks to see if
the line is blank

                response, lines, bytes = M.retr(i+1)
                # For each line in message
                for line in lines:
                    if not line.strip():
                        M.dele(i+1)
                        break

                    emailMessage = email.message_from_string(line)
                    # Get fields
                    fields = emailMessage.keys()
                    # If email contains "From" field
                    if emailMessage.has_key("From"):
                        # Get contents of From field
                        from_field = emailMessage.__getitem__("From")


From alfps at start.no  Thu Mar 11 18:22:02 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Fri, 12 Mar 2010 00:22:02 +0100
Subject: inspect.stack() and frame
In-Reply-To: <6f3a93d6-5608-467f-a7db-d360a34fe856@i25g2000yqm.googlegroups.com>
References: <6f3a93d6-5608-467f-a7db-d360a34fe856@i25g2000yqm.googlegroups.com>
Message-ID: <hnbtus$p5s$1@news.eternal-september.org>

* F?lix-Antoine Fortin:
> Given this code :
> # Experience with frame
> import sys
> import inspect
> 
> def foo():
>     stack = inspect.stack()
>     print "foo frame : " + str(hex(id(sys._getframe())))

hex returns a string. applying str is therefore redundant.


> def foo2():
>     inspect.stack()
>     print "foo2 frame : " + str(hex(id(sys._getframe())))
> 
> def bar():
>     print "bar frame : " + str(hex(id(sys._getframe())))
> 
> foo()
> foo()
> 
> foo2()
> foo2()
> 
> bar()
> bar()
> 
> Output example :
> foo frame : 0x84d2c0
> foo frame : 0x844bf0
> foo2 frame : 0x898c90
> foo2 frame : 0x898c90
> bar frame : 0x898f70
> bar frame : 0x898f70
> 
> Why are the ids (address) of the frame for each foo call not the same?

You're dealing with Python objects. You're not dealing with the computer's 
machine stack. Whether you get the same id for two objects whose lifetimes don't 
overlap depends on the implementation's memory and id allocation strategy.


> Or why the call to "stack = inspect.stack()" change the address of the
> frame?

Does it?


Cheers,

- Alf


From python at rgbaz.eu  Thu Mar 11 18:29:12 2010
From: python at rgbaz.eu (PythonAB)
Date: Fri, 12 Mar 2010 00:29:12 +0100
Subject: Bluetooth
In-Reply-To: <4B97B7F8.2030303@fedex.com>
References: <BD5B58B2-7774-4F42-90BC-5D0AF8CC82F7@rgbaz.eu>
	<4B97B7F8.2030303@fedex.com>
Message-ID: <1ED82F61-E3E8-4A3A-8028-0F8D4B82E580@rgbaz.eu>


On 10 mrt 2010, at 16:17, Jeff Peck wrote:

> On 3/7/2010 1:26 PM, PythonAB wrote:
>> 
>> Hello,
>> 
>> 
>> I'm writing a script that has to connect a bluetooth device
>> with a 3D application.
>> On my search for a bluetooth module i ran into this:
>> http://www.python.org/download/releases/2.4/notes/
>> where it says:
>> "The socket module now supports Bluetooth sockets,
>> if the system has <bluetooth/bluetooth.h>"
>> 
>> Yet I can't find anything at all in the socket manuals
>> nor anywhere else on the site...
>> 
>> Does the socket module really support Bluetooth out of the box?
>> I've used socket before but never read anything about bluetooth...
>> 
>> Maybe I need to get the bluetooth.h file, but i have no idea what I
>> am supposed to do with it...
>> 
>> Can anyone shed some light on this for me please?
>> 
>> thanks in advance,
>> 
>> gr
>> Arno
> 
> Have you come across the PyBluez library yet? I recently used it in a project and it worked very well.
> 
> Hth,
> Jeff

Hi Jeff,

Yes I ran into it, but couldn't find an OSX version...
I'm using the lightblue module now but would have preferred
to use the socket module without compiling python myself.

Sorry for not mentioning the platform.

gr
Arno
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From jjposner at optimum.net  Thu Mar 11 18:39:12 2010
From: jjposner at optimum.net (John Posner)
Date: Thu, 11 Mar 2010 18:39:12 -0500
Subject: pivot() equivalent
In-Reply-To: <e4febcbf-4efd-4a30-948d-43bdbd207e0b@g4g2000yqa.googlegroups.com>
References: <e4febcbf-4efd-4a30-948d-43bdbd207e0b@g4g2000yqa.googlegroups.com>
Message-ID: <4b997f06$0$5013$607ed4bc@cv.net>

On 3/11/2010 6:16 PM, gundlach wrote:
> I *know* this already exists, but I can't remember where:
>
> def pivot(func, seq):
>    # I know, a good implementation shouldn't call func() twice per item
>    return ( (x for x in seq if func(x)), (x for x in seq if not
> func(x)) )
>
> I feel like I read a thread in which this was argued to death, and I
> can't find that either.
>
> The scenario: I have a sequence of lines from a file.  I want to split
> it into those lines that contain a substring, and those that don't.  I
> want it to be more efficient and prettier than
>
> with = [x for x in lines if substring in x]
> without = [x for x in lines if substring not in x]
>
> Does this exist?
>
> TIA,
> Michael

Try this:

 > type lines.txt
the
quick
brown
fox
jumps
over
the
lazy
dog

 > type pivot.py

def pivot(pivot_function, filename):
     a_list = []
     b_list = []
     for line in open(filename):
         target_list = a_list if pivot_function(line) else b_list
         target_list.append(line[:-1])
     return (a_list, b_list)

print pivot(lambda line: 'e' in line, "lines.txt")

 > python pivot.py
(['the', 'over', 'the'], ['quick', 'brown', 'fox', 'jumps', 'lazy', 'dog'])

-John


From python at mrabarnett.plus.com  Thu Mar 11 18:50:13 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 11 Mar 2010 23:50:13 +0000
Subject: pivot() equivalent
In-Reply-To: <e4febcbf-4efd-4a30-948d-43bdbd207e0b@g4g2000yqa.googlegroups.com>
References: <e4febcbf-4efd-4a30-948d-43bdbd207e0b@g4g2000yqa.googlegroups.com>
Message-ID: <4B9981B5.4020005@mrabarnett.plus.com>

gundlach wrote:
> I *know* this already exists, but I can't remember where:
> 
> def pivot(func, seq):
>   # I know, a good implementation shouldn't call func() twice per item
>   return ( (x for x in seq if func(x)), (x for x in seq if not
> func(x)) )
> 
> I feel like I read a thread in which this was argued to death, and I
> can't find that either.
> 
> The scenario: I have a sequence of lines from a file.  I want to split
> it into those lines that contain a substring, and those that don't.  I
> want it to be more efficient and prettier than
> 
> with = [x for x in lines if substring in x]
> without = [x for x in lines if substring not in x]
> 
> Does this exist?
> 
The clearest way is just:

def pivot(func, seq):
     with, without = [], []
     for x in seq:
         if func(x):
             with.append(x)
         else:
             without.append(x)
     return with, without


From felix.antoine.fortin at gmail.com  Thu Mar 11 19:03:07 2010
From: felix.antoine.fortin at gmail.com (=?ISO-8859-1?Q?F=E9lix=2DAntoine_Fortin?=)
Date: Thu, 11 Mar 2010 16:03:07 -0800 (PST)
Subject: inspect.stack() and frame
References: <6f3a93d6-5608-467f-a7db-d360a34fe856@i25g2000yqm.googlegroups.com>
	<hnbtus$p5s$1@news.eternal-september.org>
Message-ID: <4988c974-c8d2-46c9-8c57-681ad22fc1bc@upsg2000gro.googlegroups.com>

On Mar 11, 6:22?pm, "Alf P. Steinbach" <al... at start.no> wrote:
> * F lix-Antoine Fortin:
>
> > Given this code :
> > # Experience with frame
> > import sys
> > import inspect
>
> > def foo():
> > ? ? stack = inspect.stack()
> > ? ? print "foo frame : " + str(hex(id(sys._getframe())))
>
> hex returns a string. applying str is therefore redundant.
>

My bad.

>
>
>
>
> > def foo2():
> > ? ? inspect.stack()
> > ? ? print "foo2 frame : " + str(hex(id(sys._getframe())))
>
> > def bar():
> > ? ? print "bar frame : " + str(hex(id(sys._getframe())))
>
> > foo()
> > foo()
>
> > foo2()
> > foo2()
>
> > bar()
> > bar()
>
> > Output example :
> > foo frame : 0x84d2c0
> > foo frame : 0x844bf0
> > foo2 frame : 0x898c90
> > foo2 frame : 0x898c90
> > bar frame : 0x898f70
> > bar frame : 0x898f70
>
> > Why are the ids (address) of the frame for each foo call not the same?
>
> You're dealing with Python objects. You're not dealing with the computer's
> machine stack. Whether you get the same id for two objects whose lifetimes don't
> overlap depends on the implementation's memory and id allocation strategy.
>

Okay, I thought I got that when I read the id documentation, but now I
get it.
So the only to compare two ids, is by making sure their lifetimes
overlap. In
this case, instead of keeping the ids, I have to keep a reference on
the frame
to make sure it is still alive when I will compare it with a second
one.

Thanks!

> > Or why the call to "stack = inspect.stack()" change the address of the
> > frame?
>
> Does it?
>

Yeah it does... I always get N different id when I run foo() N times
in a row.
Actually, what you said about lifetime applies here too. Here is
another quick
snippet :

import sys
import inspect

def foo():
    stack = inspect.stack()
    return sys._getframe()

def foo2():
    stack = inspect.stack()
    del stack
    return sys._getframe()

def bar():
        inspect.stack()
        return sys._getframe()

frame_foo = foo()
frame_foo2 = foo2()
frame_bar = bar()

print sys.getrefcount(frame_foo)
print sys.getrefcount(frame_foo2)
print sys.getrefcount(frame_bar)

Output :
3
2
2

So it seems that there is one more reference to the foo frame because
only because of "stack = inspect.stack()", so its lifetime isn't done
contrary to foo2 and bar frame, and the frame id of a foo frame is
different for each call.

Now, what is keeping a reference on foo frame?

Thanks Alf,

Felix



From gagsl-py2 at yahoo.com.ar  Thu Mar 11 20:22:51 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 11 Mar 2010 22:22:51 -0300
Subject: EOFError: EOF when reading a line
References: <aaf3117e-8612-43f7-82dd-dcb628db5fd0@l12g2000prg.googlegroups.com>
Message-ID: <op.u9fksdx9x6zn5v@lepton.softlabbsas.com.ar>

En Thu, 11 Mar 2010 06:12:02 -0300, Mihir Patel <mihir3445 at gmail.com>  
escribi?:

> I am trying to use the subprocess to send the data to child process. I
> am not sure why i keep getting  "EOFError: EOF when reading a line"
>
> command_line = 'python test_input.py'
> p =subprocess.Popen(command_line, shell=True, stdin=subprocess.PIPE,
> stdout=subprocess.PIPE)
> print 'output:', p.communicate()[0]
>
> o,e = p.communicate('test')

You may call communicate at most once.

-- 
Gabriel Genellina



From albert at spenarnc.xs4all.nl  Thu Mar 11 20:33:12 2010
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 12 Mar 2010 01:33:12 GMT
Subject: My four-yorkshireprogrammers contribution
References: <20100224212303.242222c6@geekmail.INVALID>
	<7v9e3rFl7mU1@mid.individual.net> <mailman.294.1267719244
	<7vdo8sFrelU1@mid.individual.net>
Message-ID: <kz5azc.gmz@spenarnc.xs4all.nl>

In article <7vdo8sFrelU1 at mid.individual.net>,
Gregory Ewing  <greg.ewing at canterbury.ac.nz> wrote:
>MRAB wrote:
>
>> By the standards of just a few years later, that's not so much a
>> microcomputer as a nanocomputer!
>
>Although not quite as nano as another design published
>in EA a couple of years earlier, the EDUC-8:
>
>   http://www.sworld.com.au/steven/educ-8/
>
>It had a *maximum* of 256 bytes -- due to the architecture,
>there was no way of addressing any more. Also it was
>divided into 16-byte pages, with indirect addressing
>required to access anything in a different page from
>the instruction. Programming for it must have been
>rather challenging.
>
>As far as I know, the EDUC-8 is unique in being the
>only computer design ever published in a hobby magazine
>that *wasn't* based on a microprocessor -- it was all
>built out of 9000 and 7400 series TTL logic chips!

There was the 74 computer in Elektuur (now Elektor).
That was a quite respectable computer, built (you guessed)
from 74-series chips. How many were built, I don't know.

>
>--
>Greg

Groetjes Albert

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- being exponential -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From steve at holdenweb.com  Thu Mar 11 20:43:44 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 11 Mar 2010 20:43:44 -0500
Subject: file seek is slow
In-Reply-To: <5fab36b5-8f04-4e17-98c0-67aab24bb239@u19g2000prh.googlegroups.com>
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>	<daf5c75e-8139-4a4a-8c27-5cef00327bb1@o3g2000yqb.googlegroups.com>
	<d86f1068-8cd4-4489-af00-450d407baf41@g28g2000prb.googlegroups.com>
	<RwVln.12295$pv.5770@news-server.bigpond.net.au>	<e8a9a95f-77b3-43ce-8110-8c6babaa6f26@z4g2000yqa.googlegroups.com>	<781d69b1-c5e1-4013-9015-4983dbfaa4d7@k6g2000prg.googlegroups.com>
	<5fab36b5-8f04-4e17-98c0-67aab24bb239@u19g2000prh.googlegroups.com>
Message-ID: <hnc6ae$ref$1@dough.gmane.org>

Metalone wrote:
> I just tried the seek test with Cython.
> Cython fseek() : 1.059 seconds.  30% slower than 'C'
> Python f.seek  : 1.458 secondds. 80% slower than 'C'.
> 
> It is amazing to me that Cython generates a 'C' file that is 1478
> lines.
> 
And what response are you seeking to your amazement?

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From albert at spenarnc.xs4all.nl  Thu Mar 11 20:49:47 2010
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 12 Mar 2010 01:49:47 GMT
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<7v69rcFcmeU1@mid.individual.net> <hmltsi$jcd$1@reader1.panix.com>
	<hmlvas$2a6$1@reader1.panix.com>
Message-ID: <kz5bqz.gti@spenarnc.xs4all.nl>

In article <hmlvas$2a6$1 at reader1.panix.com>,
Grant Edwards  <invalid at invalid.invalid> wrote:
>On 2010-03-03, Grant Edwards <invalid at invalid.invalid> wrote:
>> On 2010-03-03, Gregory Ewing <greg.ewing at canterbury.ac.nz> wrote:
>>> Grant Edwards wrote:
>>>
>>>> Just a mediocre copy of the CP/M filesystem, which was in turn
>>>> copied from DEC's RSTS or RSX.
>>>
>>> It was actually an improvement over CP/M's file system. CP/M
>>> didn't have hierarchical directories
>>
>> Neither did the original MS-DOS filesystem.
>>
>>> or timestamps and recorded file sizes in 128-byte blocks
>>> rather than bytes.
>>
>> I thought that was true of the original MS-DOS filesystem as
>> well, but I wouldn't bet money on it.
>
>I definitely remember that old MS-DOS programs would treat
>Ctrl-Z as an EOF marker when it was read from a text file and
>would terminate a text file with a Ctrl-Z when writing one.
>
>I don't know if that was because the underlying filesystem was
>still did everything in blocks or if it was because those
>MS-DOS programs were direct ports of CP/M programs.  I would
>have sworn that the orignal MS-DOS file API was FCB based and
>worked almost exactly like CP/M.  IIRC, the "byte stream" API
>showed up (in the OS) sever versions later.  The byte stream
>API was implemented by many compiler vendor's C libraries on
>top of the block-oriented FCB API.

My programming reference manual for MSDOS 6.0 (1993)
states the FCB stuff as "superseded" (not obsolete or obsolescent).
It states:
"A programmer should not use a superseded function except to
maintain compatibility with versions of MS-DOS earlier than
version 2.0."

FCB did *not* support paths, but you could access the current
directory.

>--
>Grant Edwards               grant.b.edwards        Yow! I had a lease on an

Groetjes Albert

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- being exponential -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From ldo at geek-central.gen.new_zealand  Thu Mar 11 22:15:23 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 12 Mar 2010 16:15:23 +1300
Subject: Reverse engineering CRC?
References: <7vj7fdFnnjU1@mid.individual.net>
	<4b947298$0$8836$c3e8da3@news.astraweb.com>
	<mailman.452.1268043207.23598.python-list@python.org>
Message-ID: <hncbkc$vkr$2@lust.ihug.co.nz>

In message <mailman.452.1268043207.23598.python-list at python.org>, Dave Angel 
wrote:

> However, if there's anything in there about how to derive the polynomial
> algorithm from (a few) samples I missed it entirely.

Given that CRC is all just a sequence of xor operations, what happens if you 
xor various pairs of CRCs together, wouldn?t that cancel out at least parts 
of the operations?


From ldo at geek-central.gen.new_zealand  Thu Mar 11 22:16:56 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 12 Mar 2010 16:16:56 +1300
Subject: Reverse engineering CRC?
References: <7vj7fdFnnjU1@mid.individual.net>
	<4b9471ee$0$8836$c3e8da3@news.astraweb.com>
	<7vk3eiFtivU1@mid.individual.net>
	<mailman.459.1268053659.23598.python-list@python.org>
	<7vlameF7goU1@mid.individual.net>
Message-ID: <hncbn9$vkr$3@lust.ihug.co.nz>

In message <7vlameF7goU1 at mid.individual.net>, Gregory Ewing wrote:

> I'm going by the fact that the application reports a
> "CRC mismatch" when it's wrong. I can't be sure that what
> it calls a "CRC" is really a true CRC, but it's more than
> a simple sum, because changing one bit in the file results
> in a completely different value.

They could be using a strong cryptographic hash and truncating it to 16 bits 
or something.

In which case you?ve got your work cut out for you...


From steve at REMOVE-THIS-cybersource.com.au  Thu Mar 11 22:24:39 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 12 Mar 2010 03:24:39 GMT
Subject: Can't define __call__ within __init__?
References: <mailman.544.1268226754.23598.python-list@python.org>
	<pan.2010.03.11.03.18.47@REMOVE.THIS.cybersource.com.au>
	<b1a8cceb-ca90-4f84-9cdf-8f07cb116a94@l24g2000prh.googlegroups.com>
Message-ID: <4b99b3f7$0$27822$c3e8da3@news.astraweb.com>

On Thu, 11 Mar 2010 08:20:14 -0800, Steve Howell wrote:

>> (2) special methods like __call__ are only called on the class, not the
>> instance, so you can't give each instance its own method.
>>
>>
> Are you sure about that?  This program prints 1, 2, 1, 2.

The rules for classic classes are different. Since classic classes have 
gone away in 3.0, and are becoming rarer in 2.x, I didn't bother to 
mention the complication.



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Thu Mar 11 22:30:02 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 12 Mar 2010 03:30:02 GMT
Subject: Can't define __call__ within __init__?
References: <mailman.544.1268226754.23598.python-list@python.org>
	<pan.2010.03.11.03.18.47@REMOVE.THIS.cybersource.com.au>
	<mailman.609.1268312412.23598.python-list@python.org>
Message-ID: <4b99b53a$0$27822$c3e8da3@news.astraweb.com>

On Thu, 11 Mar 2010 07:56:59 -0500, Neal Becker wrote:

> The example I showed was just a toy problem.  The real problem is I
> expect to call a function many times, and I want to avoid the overhead
> of the 'if blah' everytime.

Unless the __call__ methods are very small, the overhead of one extra if 
and one extra attribute lookup will be insignificant.


-- 
Steven


From lin.jianying at hotmail.com  Thu Mar 11 22:55:13 2010
From: lin.jianying at hotmail.com (marrylin)
Date: Thu, 11 Mar 2010 19:55:13 -0800 (PST)
Subject: Hello,everybody,the good shoping place,the new year approaching, 
	click in. Let's facelift bar!
Message-ID: <f1e3a910-8fdc-4c09-a33d-43ae591ba8c1@f8g2000yqn.googlegroups.com>

Hello,everybody,the good shoping place,the new year approaching, click
in. Let's facelift bar!
===== HTTP://steezeclothing.com   ====

Air jordan(1-24)shoes $33

UGG BOOT $50

Nike shox(R4,NZ,OZ,TL1,TL2,TL3) $35

Handbags(Coach lv fendi d&g) $35

Tshirts (Polo ,ed hardy,lacoste) $16

Jean(True Religion,ed hardy,coogi) $30

Sunglasses(Oakey,coach,gucci,Armaini) $16

New era cap $15

Bikini (Ed hardy,polo) $25

FREE SHIPPING


From python at bdurham.com  Fri Mar 12 00:41:16 2010
From: python at bdurham.com (python at bdurham.com)
Date: Fri, 12 Mar 2010 00:41:16 -0500
Subject: Any downsides to UPX-ing my 32-bit Python 2.6.4 EXE/PYD/DLL files?
Message-ID: <1268372476.27561.1364429171@webmail.messagingengine.com>

Are there any downsides to UPX-ing my 32-bit Python 2.6.4
development environment EXE/PYD/DLL files?

The reason I'm asking is that I frequently use a custom PY2EXE
script that UPX's copies of these files on every build.

Yes, I could get fancy and try to cache UPXed files, but I think
a simpler, safer, and higher performance solution would be for me
to just UPX my Python 2.6.4 directory once and be done with it.

What are your thoughts?

Malcolm
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From gandalf at shopzeus.com  Fri Mar 12 00:48:52 2010
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Fri, 12 Mar 2010 06:48:52 +0100
Subject: sqlite3 is sqlite 2?
Message-ID: <4B99D5C4.8070100@shopzeus.com>

gandalf at ubuntu:~$ python
Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
[GCC 4.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
 >>> import sqlite3
 >>> sqlite3.version
'2.4.1'

Is it possible to install a real sqlite version 3 somehow? I really need 
it because I have to use savepoint/rollback to. That is only supported 
from sqlite 3.6.8. Is it enough if I upgrade to Ubuntu Karmic? I know 
that is not a question about Python itself.

But still, it is interesting that a module named "sqlite3" can actually 
be used for something called "sqlite 2".

Thanks

   Laszlo



From pmaupin at gmail.com  Fri Mar 12 01:02:54 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Fri, 12 Mar 2010 00:02:54 -0600
Subject: ANNOUNCE: RSON v 0.02 available
Message-ID: <d09829f51003112202q226a8da5hbe79d747f000be42@mail.gmail.com>

RSON (Readable Serial Object Notation) is a superset of JSON that is
suitable for files that humans have to edit and diff.

The current release is decoder-only, but the decoder will read files
encoded by JSON encoders such as json or simplejson.

The current release consists of a single Python module and a short
manual.  The manual admittedly needs some work, but has a few syntax
examples.

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


From gagsl-py2 at yahoo.com.ar  Fri Mar 12 01:11:44 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 12 Mar 2010 03:11:44 -0300
Subject: inspect.stack() and frame
References: <6f3a93d6-5608-467f-a7db-d360a34fe856@i25g2000yqm.googlegroups.com>
	<hnbtus$p5s$1@news.eternal-september.org>
	<4988c974-c8d2-46c9-8c57-681ad22fc1bc@upsg2000gro.googlegroups.com>
Message-ID: <op.u9fx5uc9x6zn5v@lepton.softlabbsas.com.ar>

En Thu, 11 Mar 2010 21:03:07 -0300, F?lix-Antoine Fortin  
<felix.antoine.fortin at gmail.com> escribi?:
> On Mar 11, 6:22 pm, "Alf P. Steinbach" <al... at start.no> wrote:
>> * F lix-Antoine Fortin:
>>
>> > Given this code :
>> > # Experience with frame
>> > import sys
>> > import inspect
>>
>> > def foo():
>> >     stack = inspect.stack()
>> >     print "foo frame : " + str(hex(id(sys._getframe())))
>>
>> > def foo2():
>> >     inspect.stack()
>> >     print "foo2 frame : " + str(hex(id(sys._getframe())))
>>
>> > def bar():
>> >     print "bar frame : " + str(hex(id(sys._getframe())))
>>
>> > foo()
>> > foo()
>>
>> > foo2()
>> > foo2()
>>
>> > bar()
>> > bar()
>>
>> > Output example :
>> > foo frame : 0x84d2c0
>> > foo frame : 0x844bf0
>> > foo2 frame : 0x898c90
>> > foo2 frame : 0x898c90
>> > bar frame : 0x898f70
>> > bar frame : 0x898f70
>>
>> > Why are the ids (address) of the frame for each foo call not the same?
>>
>> You're dealing with Python objects. You're not dealing with the  
>> computer's
>> machine stack. Whether you get the same id for two objects whose  
>> lifetimes don't
>> overlap depends on the implementation's memory and id allocation  
>> strategy.
>>
>
> Okay, I thought I got that when I read the id documentation, but now I
> get it.
> So the only to compare two ids, is by making sure their lifetimes
> overlap. In
> this case, instead of keeping the ids, I have to keep a reference on
> the frame
> to make sure it is still alive when I will compare it with a second
> one.

The best way to compare object identities is using the 'is' operator: `a  
is b` returns true if and only if after evaluating both operands they are  
the very same object.
id() may be misleading if you are not careful:

py> id([]) == id([])
True
py> [] is []
False

>> > Or why the call to "stack = inspect.stack()" change the address of the
>> > frame?
>>
>> Does it?
>
> Yeah it does... I always get N different id when I run foo() N times
> in a row.

Think again after reading the response below.

> Actually, what you said about lifetime applies here too. Here is
> another quick
> snippet :
>
> import sys
> import inspect
>
> def foo():
>     stack = inspect.stack()
>     return sys._getframe()
>
> def foo2():
>     stack = inspect.stack()
>     del stack
>     return sys._getframe()
>
> def bar():
>         inspect.stack()
>         return sys._getframe()
>
> frame_foo = foo()
> frame_foo2 = foo2()
> frame_bar = bar()
>
> print sys.getrefcount(frame_foo)
> print sys.getrefcount(frame_foo2)
> print sys.getrefcount(frame_bar)
>
> Output :
> 3
> 2
> 2
>
> So it seems that there is one more reference to the foo frame because
> only because of "stack = inspect.stack()", so its lifetime isn't done
> contrary to foo2 and bar frame, and the frame id of a foo frame is
> different for each call.
>
> Now, what is keeping a reference on foo frame?

The foo frame keeps a reference to the 'stack' local variable (in its  
f_locals attribute), and 'stack' keeps a reference to the current frame  
too.
This doesn't happen neither in foo2() nor bar(), where the local array is  
empty. inspect.stack() isn't special: any other reference to the current  
frame would have the same effect.

Let's examine the simple example above:

py> id([]) == id([])
True

Python creates an empty list, takes its id, and discards the list. The  
list object is then ready to be re-used again (the interpreter keeps a  
list of free objects for many common types), so the right-hand side gets  
the very same list.

The same thing happens with the frame object in your first examples foo2()  
and bar(): the frame object is discarded after leaving the function, and  
is ready to be used again in the next call. But foo() creates a circular  
reference - the frame object is still alive after leaving the first call,  
so the second call must use a new frame. (The garbage collector will,  
eventually, break the cycle and free those objects, but not very soon).

-- 
Gabriel Genellina



From enleverLesX_XXmcX at XmclavXeauX.com.invalid  Fri Mar 12 01:32:13 2010
From: enleverLesX_XXmcX at XmclavXeauX.com.invalid (Michel Claveau - MVP)
Date: Fri, 12 Mar 2010 07:32:13 +0100
Subject: bypass UAC control through python script (to be run from
	batchfile)
References: <26028cd0-8ead-47d0-95d8-09e2214dddd3@e7g2000yqf.googlegroups.com>
Message-ID: <4b99dff5$0$17899$ba4acef3@reader.news.orange.fr>

Hi !

Install a resident soff (script) by task-planified, in Administrator
rights. Then, call this script from current work, for bypass UAC.

@-salutations
-- 
Michel Claveau


From gandalf at shopzeus.com  Fri Mar 12 01:46:48 2010
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Fri, 12 Mar 2010 07:46:48 +0100
Subject: sqlite savepoint problem (was: Re: sqlite3 is sqlite 2?)
In-Reply-To: <87bpeqzmmv.fsf@castleamber.com>
References: <mailman.752.1268596146.23598.python-list@python.org>
	<87bpeqzmmv.fsf@castleamber.com>
Message-ID: <4B99E358.4020507@shopzeus.com>

>
> That's the sqlite *bindings* version:
>
>   >>> sqlite3.version
>   '2.4.1'
>   >>> sqlite3.sqlite_version
>   '3.6.16'
>   >>>

Thanks. I tried it and RELEASE command didn't work:

 >>> import sqlite3
 >>> conn = sqlite3.connect(':memory:')
 >>> with conn:
...     conn.execute("BEGIN")
...     conn.execute("create table a ( i integer)")
...     conn.execute("insert into a values (1)")
...     conn.execute("savepoint sp1")
...     conn.execute("insert into a values(2)")
...     conn.execute("release sp1")
...     conn.execute("COMMIT")
...
<sqlite3.Cursor object at 0xb7e29b30>
<sqlite3.Cursor object at 0xb7e29b60>
<sqlite3.Cursor object at 0xb7e29b30>
<sqlite3.Cursor object at 0xb7e29b60>
<sqlite3.Cursor object at 0xb7e29b30>
Traceback (most recent call last):
  File "<stdin>", line 7, in <module>
sqlite3.OperationalError: no such savepoint: sp1
 >>>


The syntax is correct: http://www.sqlite.org/lang_savepoint.html
The savepoint was really created.
But I get this error, telling "no such savepoint". What is wrong here? 
Maybe it has to do something with transaction isolation? :-s

Thank you

   Laszlo



From agoretoy at gmail.com  Fri Mar 12 01:52:15 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Fri, 12 Mar 2010 00:52:15 -0600
Subject: execute bash builtins in python
Message-ID: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com>

hi,
i'm trying to write a section of my program that needs to run bash builtin
alias and declare, i've googled and tried every type of example i could find
no to avail. this is what I've tried below and it doesn't work, is there a
way for me to execute a bah builin from python? what i need is to take alias
output and pipe it to another command with python and return the results to
a string or list.

>>> p1=Popen(["alias"],stdout=PIPE)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.6/subprocess.py", line 621, in __init__
    errread, errwrite)
  File "/usr/lib/python2.6/subprocess.py", line 1126, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

if i add shell=True i get empty string and no thins error message

>>> p1=Popen(["alias"],stdout=PIPE,shell=True)
>>> p1
<subprocess.Popen object at 0xb7589a4c>
>>> p1.stdout.read()
''

thank you,
-Alex Goretoy
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From mailinglists at riddergarn.dk  Fri Mar 12 02:11:20 2010
From: mailinglists at riddergarn.dk (John P.)
Date: Fri, 12 Mar 2010 07:11:20 +0000
Subject: Threading, Queue for a function so it only runs once at a time.
Message-ID: <84d41f095f0958519ea44d749793efeb@incoming.servage.net>

Hi, 

Im programming a simple webcrawler with threading for the fun of it, which
is inserting the data fetch into a mysql database, but after continuously
cause my mysql server to produce error during database queries (i assume
its cause because of the many execution at the same time.) the scipt
produces errors.

I figured out i need some kind of queue for the function i use to insert
into the database, to make sure its only called once at a time.

I have looked at the Queue module but its for more complicated than my
current python skills can cope with. :)

Would somebody please help me out here?

Thanks.

--
John P.


From zookog at gmail.com  Fri Mar 12 02:11:37 2010
From: zookog at gmail.com (Zooko O'Whielacronx)
Date: Fri, 12 Mar 2010 00:11:37 -0700
Subject: StringChain -- a data structure for managing large sequences of 
	chunks of bytes
Message-ID: <cd6401a1003112311l296e3ef7k8fc917b0323fd6d7@mail.gmail.com>

Folks:

Every couple of years I run into a problem where some Python code that
worked well at small scales starts burning up my CPU at larger scales,
and the underlying issue turns out to be the idiom of accumulating
data by string concatenation. It just happened again
(http://foolscap.lothar.com/trac/ticket/149 ), and as usual it is hard
to make the data accumulator efficient without introducing a bunch of
bugs into the surrounding code. So this time around I decided to try
encapsulating my preferred more efficient idiom into a reusable class.

So I present to you StringChain, which is an efficient way to
accumulate and process data in many chunks:

http://tahoe-lafs.org/trac/stringchain

Here are some benchmarks generated by running python -OOu -c 'from
stringchain.bench import bench; bench.quick_bench()' as instructed by
the README.txt file.

The N: in the left-hand column is how many bytes were in the test
dataset. The ave rate: number in the right-hand column is how many
bytes per second were processed. "naive" means the string-based idiom
sketched above and "strch" means using the StringChain class.

_buildup init_naive
N:   65536, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:    890, ave
rate: 58350579
N:  131072, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:    265, ave
rate: 34800398
N:  262144, time: best:    0.01,   2th-best:    0.01, ave:    0.01,
2th-worst:    0.01, worst:    0.01 (of      5), reps/s:     79, ave
rate: 20745346
N:  524288, time: best:    0.05,   2th-best:    0.05, ave:    0.05,
2th-worst:    0.05, worst:    0.05 (of      5), reps/s:     20, ave
rate: 10823850
_buildup init_strch
N:   65536, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:  25543, ave
rate: 1674043282
N:  131072, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:  14179, ave
rate: 1858538925
N:  262144, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:   8016, ave
rate: 2101513050
N:  524288, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:   4108, ave
rate: 2154215572
_consume init_naive_loaded
N:   65536, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:    931, ave
rate: 61037862
N:  131072, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:    270, ave
rate: 35454393
N:  262144, time: best:    0.01,   2th-best:    0.01, ave:    0.01,
2th-worst:    0.01, worst:    0.01 (of      5), reps/s:     74, ave
rate: 19471963
N:  524288, time: best:    0.05,   2th-best:    0.05, ave:    0.05,
2th-worst:    0.05, worst:    0.06 (of      5), reps/s:     19, ave
rate: 10146747
_consume init_strch_loaded
N:   65536, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:   4309, ave
rate: 282447500
N:  131072, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:   2313, ave
rate: 303263357
N:  262144, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:   1186, ave
rate: 311159052
N:  524288, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:    606, ave
rate: 317814669
_randomy init_naive
N:   65536, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:    479, ave
rate: 31450561
N:  131072, time: best:    0.01,   2th-best:    0.01, ave:    0.01,
2th-worst:    0.01, worst:    0.01 (of      5), reps/s:    140, ave
rate: 18461191
N:  262144, time: best:    0.02,   2th-best:    0.02, ave:    0.02,
2th-worst:    0.03, worst:    0.03 (of      5), reps/s:     42, ave
rate: 11127714
N:  524288, time: best:    0.06,   2th-best:    0.07, ave:    0.08,
2th-worst:    0.08, worst:    0.09 (of      5), reps/s:     13, ave
rate:  6906341
_randomy init_strch
N:   65536, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:    973, ave
rate: 63827127
N:  131072, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:    495, ave
rate: 64970669
N:  262144, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:    239, ave
rate: 62913360
N:  524288, time: best:    0.01,   2th-best:    0.01, ave:    0.01,
2th-worst:    0.01, worst:    0.01 (of      5), reps/s:    121, ave
rate: 63811569

The naive approach is slower than the StringChain class, and the
bigger the dataset the slower it goes. The StringChain class is fast
and also it is scalable (with regard to these benchmarks at least...).

Thanks!

Regards,

Zooko


From no.email at nospam.invalid  Fri Mar 12 02:20:08 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Thu, 11 Mar 2010 23:20:08 -0800
Subject: StringChain -- a data structure for managing large sequences of
	chunks of bytes
References: <mailman.646.1268377905.23598.python-list@python.org>
Message-ID: <7xd3za6m6v.fsf@ruckus.brouhaha.com>

"Zooko O'Whielacronx" <zookog at gmail.com> writes:
> Every couple of years I run into a problem where some Python code that
> worked well at small scales starts burning up my CPU at larger scales,
> and the underlying issue turns out to be the idiom of accumulating
> data by string concatenation. 

I usually use StringIO or cStringIO for that (python 2.x syntax):

   buf = cStringIO()
   buf.write("first thing")
   buf.write("second thing")
   result = buf.getvalue()

Sometimes I like to use a generator instead:

  def stuff():
     yield "first thing"
     yield "second thing"

  result = ''.join(stuff())


From martin at v.loewis.de  Fri Mar 12 02:31:42 2010
From: martin at v.loewis.de (Martin v. Loewis)
Date: Fri, 12 Mar 2010 08:31:42 +0100
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
In-Reply-To: <72a0d93e-50f8-415b-aa74-5d7abe6d8523@z11g2000yqz.googlegroups.com>
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>
	<mailman.619.1268324988.23598.python-list@python.org>
	<4B992FB5.8090207@v.loewis.de>
	<72a0d93e-50f8-415b-aa74-5d7abe6d8523@z11g2000yqz.googlegroups.com>
Message-ID: <4B99EDDE.5070604@v.loewis.de>

> I?m sorry everyone. I didn?t realise I had installed the 64-bit
> version of Python. Well, at least someone else might find have the
> same problem. But I think that there is going to be a bit of a rough
> patch as everyone moves over to 64-bit.

Expect that move to take a few more years. 64-bit CPUs were introduced
more than ten years ago (e.g. Alpha, in 1992), and only slowly reach
"the masses". People typically still don't have more than 4GiB of memory
in their desktop PCs or laptops, so users who do install 64-bit
operating systems on such hardware are still early adaptors.

Regards,
Martin


From gandalf at shopzeus.com  Fri Mar 12 02:32:21 2010
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Fri, 12 Mar 2010 08:32:21 +0100
Subject: sqlite savepoint problem
In-Reply-To: <1268600658.2846.17.camel@durian>
References: <mailman.752.1268596146.23598.python-list@python.org>	
	<87bpeqzmmv.fsf@castleamber.com> <4B99E358.4020507@shopzeus.com>
	<1268600658.2846.17.camel@durian>
Message-ID: <4B99EE05.8060505@shopzeus.com>


> From memory you can't issue a "CREATE TABLE" statement inside a
> transaction, at least not at the default isolation level.  Such a
> statement will automatically commit the current transaction.  Doesn't
> help with your current problem but worth pointing out :-)
>   
Thank you. I'll keep in mind.
> When debugging strange transaction behaviour, I find it easiest to
> create the connection with isolation_level=None so that are no implicit
> transactions being created behind your back.  Not sure why, but setting
> this makes your example work for me.
>   
Yes, same for me. But setting it to None means auto commit mode! See here:

http://docs.python.org/library/sqlite3.html#sqlite3-controlling-transactions


But it does not work that way. Look at this example

import sqlite3

conn = sqlite3.connect(':memory:')
conn.isolation_level = None
with conn:
    conn.execute("create table a ( i integer ) ")

with conn:
    conn.execute("insert into a values (1)")
    conn.execute("SAVEPOINT sp1")
    conn.execute("insert into a values (2)")
    conn.execute("SAVEPOINT sp2")
    conn.execute("insert into a values (3)")
    conn.execute("ROLLBACK TO sp2")
    conn.execute("insert into a values (4)")
    conn.execute("RELEASE sp1")

with conn:
    for row in conn.execute("select * from a"):
        print row
       

It prints:

(1,)
(2,)
(4,)

So everything is working. Nothing is auto commited. But if I change it 
to "DEFERRED" or "IMMEDIATE" or "EXCLUSIVE" then it won't work. Why?

I'm now confused. Also, I could not find anything about these isolation 
levels on the sqlite website. The only think I could find is "PRAGMA 
read_uncommited". If that is the same as setting isolation_level to 
None, then I don't want it.

   L





From gandalf at shopzeus.com  Fri Mar 12 02:48:33 2010
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Fri, 12 Mar 2010 08:48:33 +0100
Subject: sqlite savepoint problem
In-Reply-To: <4B99EE05.8060505@shopzeus.com>
References: <mailman.752.1268596146.23598.python-list@python.org>		<87bpeqzmmv.fsf@castleamber.com>
	<4B99E358.4020507@shopzeus.com>	<1268600658.2846.17.camel@durian>
	<4B99EE05.8060505@shopzeus.com>
Message-ID: <4B99F1D1.2070202@shopzeus.com>


>
> I'm now confused. Also, I could not find anything about these 
> isolation levels on the sqlite website. The only think I could find is 
> "PRAGMA read_uncommited". If that is the same as setting 
> isolation_level to None, then I don't want it.
Yes, it is. Here is a test:

import os
import sqlite3
import threading
import time

FPATH = '/tmp/test.sqlite'
if os.path.isfile(FPATH):
    os.unlink(FPATH)

def getconn():
    global FPATH
    conn = sqlite3.connect(FPATH)
    conn.isolation_level = None
    return conn

class Thr1(threading.Thread):
    def run(self):
        conn = getconn()
        print "Thr1: Inserting 0,1,2,3,4,5"
        with conn:
            for i in range(6):
                conn.execute("insert into a values (?)",[i])
        print "Thr1: Commited"
        with conn:
            print "Thr1: Selecting all rows:"
            for row in conn.execute("select * from a"):
                print row
            print "Thr1: Wait some..."
            time.sleep(3)
            print "Thr1: Selecting again, in the same transaction"
            for row in conn.execute("select * from a"):
                print row


class Thr2(threading.Thread):
    def run(self):
        conn = getconn()
        with conn:
            print "Thr2: deleting all rows from a"
            conn.execute("delete from a")
            print "Thr2: Now we wait some BEFORE commiting changes."
            time.sleep(3)
            print "Thr2: Will roll back!"
            raise Exception


def main():
    with getconn() as conn:
        conn.execute("create table a ( i integer ) ")
    thr1 = Thr1()
    thr1.start()
    time.sleep(1)
    thr1 = Thr2()
    thr1.start()

main()


And the test result:

Thr1: Inserting 0,1,2,3,4,5
Thr1: Commited
Thr1: Selecting all rows:
(0,)
(1,)
(2,)
(3,)
(4,)
(5,)
Thr1: Wait some...
Thr2: deleting all rows from a
Thr2: Now we wait some BEFORE commiting changes.
Thr1: Selecting again, in the same transaction
Thr2: Will roll back!
Exception in thread Thread-2:
Traceback (most recent call last):
  File "/usr/lib/python2.6/threading.py", line 525, in __bootstrap_inner
    self.run()
  File "test.py", line 44, in run
    raise Exception
Exception


It means that setting isolation_level to None will really allow 
uncommited changes to be read by other transactions! This is sad, and of 
course this is something that I do not want.  If I change it to DEFERRED 
then I get a correct result:

Thr1: Inserting 0,1,2,3,4,5
Thr1: Commited
Thr1: Selecting all rows:
(0,)
(1,)
(2,)
(3,)
(4,)
(5,)
Thr1: Wait some...
Thr2: deleting all rows from a
Thr2: Now we wait some BEFORE commiting changes.
Thr1: Selecting again, in the same transaction
(0,)
(1,)
(2,)
(3,)
(4,)
(5,)
Thr2: Will roll back!

However, then savepoints won't work. Is there any way to use read 
commited (or higher) isolation level, and have savepoints working at the 
same time?

I don't see how would savepoints be useful without at least read 
commited isolation level. :-(

  L



From dr.cg at 126.com  Fri Mar 12 02:51:11 2010
From: dr.cg at 126.com (CHEN Guang)
Date: Fri, 12 Mar 2010 15:51:11 +0800 (CST)
Subject: file seek is slow
Message-ID: <61ca1c62.17647.127515b0539.Coremail.dr.cg@126.com>

 
Metalone wrote:
> I just tried the seek test with Cython.
> Cython fseek() : 1.059 seconds.  30% slower than 'C'
> Python f.seek  : 1.458 secondds. 80% slower than 'C'.
> 
> It is amazing to me that Cython generates a 'C' file that is 1478
> lines.
> 
 
PythoidC ( http://pythoidc.googlecode.com ) generates the shortest 'C' file.
PythoidC is the C language like the Python, by the Python and for the Python.
CHEN Guang
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From stefan_ml at behnel.de  Fri Mar 12 03:15:09 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 12 Mar 2010 09:15:09 +0100
Subject: file seek is slow
In-Reply-To: <61ca1c62.17647.127515b0539.Coremail.dr.cg@126.com>
References: <61ca1c62.17647.127515b0539.Coremail.dr.cg@126.com>
Message-ID: <hnct6d$fcg$1@dough.gmane.org>

CHEN Guang, 12.03.2010 08:51:
> Metalone wrote:
>> I just tried the seek test with Cython.
>> Cython fseek() : 1.059 seconds.  30% slower than 'C'
>> Python f.seek  : 1.458 secondds. 80% slower than 'C'.
>>
>> It is amazing to me that Cython generates a 'C' file that is 1478
>> lines.
>
> PythoidC ( http://pythoidc.googlecode.com ) generates the shortest 'C' file.
> PythoidC is the C language like the Python, by the Python and for the Python.

Except that it's not a language but rather a syntax converter, i.e. it 
doesn't really add any features to the C language but rather restricts 
Python syntax to C language features (plus a bit of header file 
introspection, it seems, but C's preprocessor has a bit of that, too).

Stefan



From gandalf at shopzeus.com  Fri Mar 12 03:35:27 2010
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Fri, 12 Mar 2010 09:35:27 +0100
Subject: sqlite savepoint problem [solved]
In-Reply-To: <1268604831.2846.23.camel@durian>
References: <mailman.752.1268596146.23598.python-list@python.org>	
	<87bpeqzmmv.fsf@castleamber.com> <4B99E358.4020507@shopzeus.com>	
	<1268600658.2846.17.camel@durian> <4B99EE05.8060505@shopzeus.com>	
	<4B99F1D1.2070202@shopzeus.com> <1268604831.2846.23.camel@durian>
Message-ID: <4B99FCCF.5080506@shopzeus.com>


> No it doesn't.  The problem is that using a connection as a context
> manager doesn't do what you think. 
>
> It does *not* start a new transaction on __enter__ and commit it on
> __exit__.  As far as I can tell it does nothing on __enter__ and calls
> con.commit() or con.rollback() on exit.  With isolation_level=None,
> these are no-ops.
>   
Thank you Ryan! You are abolutely right, and thank you for reading the 
source.  Now everything works as I imagined.

The way the context manager and isolation_level works looks very very 
strange to me. Here is a demonstration:

import sqlite3
def getconn():
    conn = sqlite3.connect(':memory:')
    conn.isolation_level = None
    return conn
def main():
    with getconn() as conn:
        conn.execute("create table a ( i integer ) ")
    try:
        conn.execute("insert into a values (1)")
        with conn:
            conn.execute("insert into a values (2)")
            raise Exception
    except:
        print "There was an error"
    for row in conn.execute("select * from a"):
        print row
main()


Output:

There was an error
(1,)
(2,)


Looks like the context manager did not roll back anything. If I remove 
isolation_level=None then I get this:

There was an error

E.g. the context manager rolled back something that was executed outside 
the context. I cannot argue with the implementation - it is that way. 
But this is not what I would expect. I believe I'm not alone with this.

Using your connection manager, everything is perfect:

There was an error
(1,)


The only thing I have left is to implement a connection manager that 
emulates nested transactions, using a stack of savepoints. :-)

Suggestions:

Just for clarity, we should put a comment at the end of the 
documentation here:

http://docs.python.org/library/sqlite3.html#sqlite3-controlling-transactions

I would add at least these things:

#1. By using isolation_level = None, connection objects (used as a 
context manager) WON'T automatically commit or rollback transactions.
#2. Using any isolation level, connection objects WON'T automatically 
begin a transaction.
#3. Possibly, include your connection manager class code, to show how to 
do it "the expected" way.

Also one should clarify in the documentation, what isolation_level does. 
Looks like setting isolation_level to None is not really an "auto commit 
mode". It is not even part of sqlite itself. It is part of the python 
extension.

Thank you again.

   Laszlo



From steve at REMOVE-THIS-cybersource.com.au  Fri Mar 12 03:52:30 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 12 Mar 2010 08:52:30 GMT
Subject: StringChain -- a data structure for managing large sequences of 
	chunks of bytes
References: <mailman.646.1268377905.23598.python-list@python.org>
Message-ID: <4b9a00ce$0$27822$c3e8da3@news.astraweb.com>

On Fri, 12 Mar 2010 00:11:37 -0700, Zooko O'Whielacronx wrote:

> Folks:
> 
> Every couple of years I run into a problem where some Python code that
> worked well at small scales starts burning up my CPU at larger scales,
> and the underlying issue turns out to be the idiom of accumulating data
> by string concatenation. 

I don't mean to discourage you, but the simple way to avoid that is not 
to accumulate data by string concatenation.

The usual Python idiom is to append substrings to a list, then once, at 
the very end, combine into a single string:


accumulator = []
for item in sequence:
    accumulator.append(process(item))
string = ''.join(accumulator)


> It just happened again
> (http://foolscap.lothar.com/trac/ticket/149 ), and as usual it is hard
> to make the data accumulator efficient without introducing a bunch of
> bugs into the surrounding code.

I'm sorry, I don't agree about that at all. I've never come across a 
situation where I wanted to use string concatenation and couldn't easily 
modify it to use the list idiom above.

[...]
> Here are some benchmarks generated by running python -OOu -c 'from
> stringchain.bench import bench; bench.quick_bench()' as instructed by
> the README.txt file.

To be taken seriously, I think you need to compare stringchain to the 
list idiom. If your benchmarks favourably compare to that, then it might 
be worthwhile.



-- 
Steven


From stefan_ml at behnel.de  Fri Mar 12 03:56:00 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 12 Mar 2010 09:56:00 +0100
Subject: file seek is slow
In-Reply-To: <5fab36b5-8f04-4e17-98c0-67aab24bb239@u19g2000prh.googlegroups.com>
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>	<daf5c75e-8139-4a4a-8c27-5cef00327bb1@o3g2000yqb.googlegroups.com>
	<d86f1068-8cd4-4489-af00-450d407baf41@g28g2000prb.googlegroups.com>
	<RwVln.12295$pv.5770@news-server.bigpond.net.au>	<e8a9a95f-77b3-43ce-8110-8c6babaa6f26@z4g2000yqa.googlegroups.com>	<781d69b1-c5e1-4013-9015-4983dbfaa4d7@k6g2000prg.googlegroups.com>
	<5fab36b5-8f04-4e17-98c0-67aab24bb239@u19g2000prh.googlegroups.com>
Message-ID: <hncvj0$o5j$1@dough.gmane.org>

Metalone, 11.03.2010 23:57:
> I just tried the seek test with Cython.
> Cython fseek() : 1.059 seconds.  30% slower than 'C'
> Python f.seek  : 1.458 secondds. 80% slower than 'C'.
>
> It is amazing to me that Cython generates a 'C' file that is 1478
> lines.

Well, it generated an optimised Python interface for your module and made 
it compilable in CPython 2.3 through 3.2. It doesn't look like your C 
module features that. ;)


> #Cython code
>
> import time
>
> cdef int SEEK_SET = 0
>
> cdef extern from "stdio.h":
>      void* fopen(char* filename, char* mode)
>      int fseek(void*, long, int)

Cython ships with a stdio.pxd that you can cimport. It looks like it 
doesn't currently define fseek(), but it defines at least fopen() and FILE. 
Patches are always welcome.


> def main():
>      cdef void* f1 = fopen('video.txt', 'rb')
>      cdef int i=1000000
>      t0 = time.clock()
>      while i>  0:
>         fseek(f1, 0, SEEK_SET)
>         i -= 1
>      delta = time.clock() - t0

Note that the call to time.clock() takes some time, too, so it's not 
surprising that this is slower than hand-written C code. Did you test how 
it scales?

Also, did you look at the generated C code or the annotated Cython code 
(cython -a)? Did you make sure both were compiled with the same CFLAGS?

Also, any reason you're not using a for-in-xrange loop? It shouldn't make a 
difference in speed, it's just more common. You even used a for loop in 
your C code.

Finally, I'm not sure why you think that these 30% matter at all. In your 
original post, you even state that seek-time isn't the "deal breaker", so 
maybe you should concentrate on the real issues?

Stefan



From neo100110 at gmail.com  Fri Mar 12 03:59:19 2010
From: neo100110 at gmail.com (Neo)
Date: Fri, 12 Mar 2010 00:59:19 -0800
Subject: Anything like "Effective Java" for Python?
In-Reply-To: <hn8d98$m0d$1@reader1.panix.com>
References: <hn8d98$m0d$1@reader1.panix.com>
Message-ID: <a3dc3481003120059r35abd3b7of83c8aafd84bdb67@mail.gmail.com>

I have learned java for half a year and now I want to learn Python, should I
learn python 3k or the traditional version?

On Wed, Mar 10, 2010 at 7:19 AM, kj <no.email at please.post> wrote:

>
>
>
> Subject line pretty much says it all: is there a book like "Effective
> Java" for Python.  I.e. a book that assumes that readers are
> experienced programmers that already know the basics of the language,
> and want to focus on more advanced programming issues?
>
> ~K
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From rizwanahmed24 at gmail.com  Fri Mar 12 04:00:48 2010
From: rizwanahmed24 at gmail.com (rizwanahmed24 at gmail.com)
Date: Fri, 12 Mar 2010 01:00:48 -0800 (PST)
Subject: bypass UAC control through python script (to be run from 
	batchfile)
References: <26028cd0-8ead-47d0-95d8-09e2214dddd3@e7g2000yqf.googlegroups.com>
	<4b99dff5$0$17899$ba4acef3@reader.news.orange.fr>
Message-ID: <2351c608-2ad5-4835-a4cb-068f6646ede0@k17g2000yqb.googlegroups.com>


Hi Michel. what is this 'resident soff' script, i cannot find it on
google. Secondly if i was to install something in admin mode, then i
would have installed the application i want to install. The actual
problem is that i dont want to manually run something with admin
rights and install.
still havent got the solution


From jgardner at jonathangardner.net  Fri Mar 12 04:05:27 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Fri, 12 Mar 2010 01:05:27 -0800
Subject: NoSQL Movement?
In-Reply-To: <BABjn.11012$pv.4575@news-server.bigpond.net.au>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<mailman.256.1267655008.23598.python-list@python.org>
	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
Message-ID: <6cc20cea1003120105j626cc519o2271106e088b2e90@mail.gmail.com>

On Wed, Mar 3, 2010 at 2:41 PM, Avid Fan <me at privacy.net> wrote:
> Jonathan Gardner wrote:
>>
>> I see it as a sign of maturity with sufficiently scaled software that
>> they no longer use an SQL database to manage their data. At some point
>> in the project's lifetime, the data is understood well enough that the
>> general nature of the SQL database is unnecessary.
>>
>
> I am really struggling to understand this concept.
>
> Is it the normalised table structure that is in question or the query
> language?
>
> Could you give some sort of example of where SQL would not be the way to go.
> ? The only things I can think of a simple flat file databases.

Sorry for the late reply.

Let's say you have an application that does some inserts and updates
and such. Eventually, you are going to run into a limitation with the
number of inserts and updates you can do at once. The typical solution
to this is to shard your database. However, there are other solutions,
such as storing the files in a different kind of database, one which
is less general but more efficient for your particular data.

Let me give you an example. I worked on a system that would load
recipients for email campaigns into a database table. The SQL database
was nice during the initial design and prototype stage because we
could quickly adjust the tables to add or remove columns and try out
different designs.. However, once our system got popular, the
limitation was how fast we could load recipients into the database.
Rather than make our DB bigger or shard the data, we discovered that
storing the recipients outside of the database in flat files was the
precise solution we needed. Each file represented a different email
campaign. The nature of the data was that we didn't need random
access, just serial access. Storing the data this way also meant
sharding the data was almost trivial. Now, we can load a massive
number of recipients in parallel.

You are going to discover certain patterns in how your data is used
and those patterns may not be best served by a generic relational
database. The relational database will definitely help you discover
and even experiment with these patterns, but eventually, you will find
its limits.

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From jgardner at jonathangardner.net  Fri Mar 12 04:14:26 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Fri, 12 Mar 2010 01:14:26 -0800
Subject: Need advice on starting a Python group
In-Reply-To: <hnb0d1$2el$1@reader1.panix.com>
References: <hnb0d1$2el$1@reader1.panix.com>
Message-ID: <6cc20cea1003120114s44ed833fmf82c06edc7d47ca0@mail.gmail.com>

On Thu, Mar 11, 2010 at 6:57 AM, gb345 <gb345 at invalid.com> wrote:
>
> And even when we've had volunteers, hardly anyone shows up!
>
> Any suggestions would be appreciated.
>

Two things: One, only you and your friend really care. Let that sink
in. No one is going to carry the group but you two, at least
initially.

Two, there's a lot of people at movie theaters and the county fair.
Why? Because it is interesting and fun. Scientists work the same way.
Yes, a lot of people are interested in Python. Why don't you do a bit
of snooping around and see what people want to know about?

Let me give some examples:

* Interactive numeric programming with Python
* Rapid website development with Pylons (Trust me, everyone wants to
make a website.) Show how you are showing off data from one of your
experiments of projects and how easy it is to organize and manage
data.
* How you used Python on your latest and greatest project

Don't expect the audience to participate, except to show up and ask questions.

If you want to build a Python support group, then form an informal
group with your friends. Start a public mailing list and offer Python
advice and support for free. Integrate whatever code your org has with
Python, and manage and maintain that code so others can use it.

Finally, advertise. The more people see "Python", the more they will
be interested. Coca-cola and Pepsi are really good at this!

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From gandalf at shopzeus.com  Fri Mar 12 05:12:39 2010
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Fri, 12 Mar 2010 11:12:39 +0100
Subject: sqlite savepoint problem [solved]
In-Reply-To: <1268639629.2846.48.camel@durian>
References: <mailman.752.1268596146.23598.python-list@python.org>	
	<87bpeqzmmv.fsf@castleamber.com> <4B99E358.4020507@shopzeus.com>	
	<1268600658.2846.17.camel@durian> <4B99EE05.8060505@shopzeus.com>	
	<4B99F1D1.2070202@shopzeus.com> <1268604831.2846.23.camel@durian>	
	<4B99FCCF.5080506@shopzeus.com> <1268639629.2846.48.camel@durian>
Message-ID: <4B9A1397.4010409@shopzeus.com>


>> #1. By using isolation_level = None, connection objects (used as a 
>> context manager) WON'T automatically commit or rollback transactions.
>> #2. Using any isolation level, connection objects WON'T automatically 
>> begin a transaction.
>> #3. Possibly, include your connection manager class code, to show how to 
>> do it "the expected" way.
>>
>> Also one should clarify in the documentation, what isolation_level does. 
>> Looks like setting isolation_level to None is not really an "auto commit 
>> mode". It is not even part of sqlite itself. It is part of the python 
>> extension.
>>     
>
> I think of it as almost the opposite - you have to set
> isolation_level=None to get the unadulterated behaviour of the
> underlying sqlite library. 
>
> I'm sure the devs would appreciate a documentation patch (submission
> details at http://python.org/dev/patches/).  I'm also pretty confident
> that I won't have time to do one up anytime soon :-)
>   
Patch submitted.

http://bugs.python.org/issue8145




From robin at reportlab.com  Fri Mar 12 05:16:44 2010
From: robin at reportlab.com (Robin Becker)
Date: Fri, 12 Mar 2010 10:16:44 +0000
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
In-Reply-To: <72a0d93e-50f8-415b-aa74-5d7abe6d8523@z11g2000yqz.googlegroups.com>
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>	<mailman.619.1268324988.23598.python-list@python.org>	<4B992FB5.8090207@v.loewis.de>
	<72a0d93e-50f8-415b-aa74-5d7abe6d8523@z11g2000yqz.googlegroups.com>
Message-ID: <4B9A148C.7050707@chamonix.reportlab.co.uk>

Following the information from MvL I will try and get the 2.6 pyds built for 
amd64, I see that there's a cross platform compile technique for distutils, but 
am not sure if it applies to bdist_winexe etc etc. I'll have a go at this next week.
-- 
Robin Becker


From greg.ewing at canterbury.ac.nz  Fri Mar 12 06:24:31 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sat, 13 Mar 2010 00:24:31 +1300
Subject: Reverse engineering CRC?
In-Reply-To: <hncbn9$vkr$3@lust.ihug.co.nz>
References: <7vj7fdFnnjU1@mid.individual.net>
	<4b9471ee$0$8836$c3e8da3@news.astraweb.com>
	<7vk3eiFtivU1@mid.individual.net>
	<mailman.459.1268053659.23598.python-list@python.org>
	<7vlameF7goU1@mid.individual.net> <hncbn9$vkr$3@lust.ihug.co.nz>
Message-ID: <7vum06Fj82U1@mid.individual.net>

Lawrence D'Oliveiro wrote:

> They could be using a strong cryptographic hash and truncating it to 16 bits 
> or something.
> 
> In which case you?ve got your work cut out for you...

Nope, I've determined that it's actually a pretty standard
CRC, and it's even using one of the standard polynomials,
0x8005. I'll explain the details of how I figured that
out in my essay.

What confused me initially is that it seems to be adding
a few extra bytes to the checked data that aren't present
in the file. Figuring out what they're supposed to contain
is proving to be quite a headache...

-- 
Greg


From news1234 at free.fr  Fri Mar 12 06:39:50 2010
From: news1234 at free.fr (News123)
Date: Fri, 12 Mar 2010 12:39:50 +0100
Subject: Need advice on starting a Python group
In-Reply-To: <mailman.653.1268385271.23598.python-list@python.org>
References: <hnb0d1$2el$1@reader1.panix.com>
	<mailman.653.1268385271.23598.python-list@python.org>
Message-ID: <4b9a2806$0$22047$426a74cc@news.free.fr>

Jonathan Gardner wrote:
> On Thu, Mar 11, 2010 at 6:57 AM, gb345 <gb345 at invalid.com> wrote:
>> And even when we've had volunteers, hardly anyone shows up!
>>
>> Any suggestions would be appreciated.
>>
> 
> Two things: One, only you and your friend really care. Let that sink
> in. No one is going to carry the group but you two, at least
> initially.
> 
> Two, there's a lot of people at movie theaters and the county fair.
> Why? Because it is interesting and fun. Scientists work the same way.
> Yes, a lot of people are interested in Python. Why don't you do a bit
> of snooping around and see what people want to know about?
> 
> Let me give some examples:
> 
> * Interactive numeric programming with Python
> * Rapid website development with Pylons (Trust me, everyone wants to
> make a website.) Show how you are showing off data from one of your
> experiments of projects and how easy it is to organize and manage
> data.
> * How you used Python on your latest and greatest project
> 
> Don't expect the audience to participate, except to show up and ask questions.
> 
> If you want to build a Python support group, then form an informal
> group with your friends. Start a public mailing list and offer Python
> advice and support for free. Integrate whatever code your org has with
> Python, and manage and maintain that code so others can use it.
> 
> Finally, advertise. The more people see "Python", the more they will
> be interested. Coca-cola and Pepsi are really good at this!
> 


attendance will be very low and be sure nobody cares to check whether
anything happened on this group.

My suggestion is:


I'd suggest to setup a group, to which one can subscribe with mail
notification and for all the old ones perhaps even via nntp ;-) and of
course via a web front end (though I personally hate web groups)

Afterwards you can 'friendly-fore-subscribe' some collegues. ;-)
Just talk about your new cool group during lunch, etc.

Be sure, that most will be to lazy to unsuscribe.

Start discussing interesting topics on this group and then . . .
maybe others start joining. maybo nobody cares and you have just to
accept it.

bye


N


From robin at reportlab.com  Fri Mar 12 06:40:00 2010
From: robin at reportlab.com (Robin Becker)
Date: Fri, 12 Mar 2010 11:40:00 +0000
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
In-Reply-To: <4B992FB5.8090207@v.loewis.de>
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>	<mailman.619.1268324988.23598.python-list@python.org>
	<4B992FB5.8090207@v.loewis.de>
Message-ID: <4B9A2810.9030602@chamonix.reportlab.co.uk>

On 11/03/2010 18:00, Martin v. Loewis wrote:
>
>>> I have a Windows 7 (64bit AMD) machine
......
>
>> Perhaps some expert on the python list knows which versions of VS
>> support 64bit; I do have VS 2005/2008 etc, but I'll probably need to set
>> up a 64bit machine to see if they will install on a 64bit architecture.
>
> For Python 2.6 and later, use VS 2008. This comes with an AMD64
> compiler. You technically don't need a 64-bit Windows, as it supports
> cross-compilation (but you would need a 64-bit Windows to test it).
>
> I personally build Python on a 32-bit machine, and move the MSI to a
> 64-bit machine for testing.
>

OK I've got the VC2008 64bit tools installed on my 32bit build platform, but I'm 
getting build errors because of missing libraries. I assume that's because I 
don't have the python amd64 runtime libraries/dlls etc etc since the errors are 
looking like this

_rl_accel.obj : error LNK2019: unresolved external symbol __imp_Py_FindMethod 
referenced in function Box_getattr
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyObject_Init 
referenced in function Box
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyObject_Malloc 
referenced in function Box
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyList_Type 
referenced in function BoxList_init
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_Py_FatalError 
referenced in function init_rl_accel
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyType_Ready 
referenced in function init_rl_accel
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyType_Type 
referenced in function init_rl_accel
_rl_accel.obj : error LNK2019: unresolved external symbol 
__imp_PyModule_AddObject referenced in function init_rl_accel
_rl_accel.obj : error LNK2019: unresolved external symbol 
__imp_PyErr_NewException referenced in function init_rl_accel
_rl_accel.obj : error LNK2019: unresolved external symbol 
__imp_Py_InitModule4_64 referenced in function init_rl_accel
build\lib.win-amd64-2.6\_rl_accel.pyd : fatal error LNK1120: 69 unresolved externals

I assume I can get those from a working Python amd64 install and stuff on one of 
the compiler paths somehow.
-- 
Robin Becker


From robin at reportlab.com  Fri Mar 12 06:40:00 2010
From: robin at reportlab.com (Robin Becker)
Date: Fri, 12 Mar 2010 11:40:00 +0000
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
In-Reply-To: <4B992FB5.8090207@v.loewis.de>
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>	<mailman.619.1268324988.23598.python-list@python.org>
	<4B992FB5.8090207@v.loewis.de>
Message-ID: <4B9A2810.9030602@chamonix.reportlab.co.uk>

On 11/03/2010 18:00, Martin v. Loewis wrote:
>
>>> I have a Windows 7 (64bit AMD) machine
......
>
>> Perhaps some expert on the python list knows which versions of VS
>> support 64bit; I do have VS 2005/2008 etc, but I'll probably need to set
>> up a 64bit machine to see if they will install on a 64bit architecture.
>
> For Python 2.6 and later, use VS 2008. This comes with an AMD64
> compiler. You technically don't need a 64-bit Windows, as it supports
> cross-compilation (but you would need a 64-bit Windows to test it).
>
> I personally build Python on a 32-bit machine, and move the MSI to a
> 64-bit machine for testing.
>

OK I've got the VC2008 64bit tools installed on my 32bit build platform, but I'm 
getting build errors because of missing libraries. I assume that's because I 
don't have the python amd64 runtime libraries/dlls etc etc since the errors are 
looking like this

_rl_accel.obj : error LNK2019: unresolved external symbol __imp_Py_FindMethod 
referenced in function Box_getattr
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyObject_Init 
referenced in function Box
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyObject_Malloc 
referenced in function Box
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyList_Type 
referenced in function BoxList_init
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_Py_FatalError 
referenced in function init_rl_accel
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyType_Ready 
referenced in function init_rl_accel
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyType_Type 
referenced in function init_rl_accel
_rl_accel.obj : error LNK2019: unresolved external symbol 
__imp_PyModule_AddObject referenced in function init_rl_accel
_rl_accel.obj : error LNK2019: unresolved external symbol 
__imp_PyErr_NewException referenced in function init_rl_accel
_rl_accel.obj : error LNK2019: unresolved external symbol 
__imp_Py_InitModule4_64 referenced in function init_rl_accel
build\lib.win-amd64-2.6\_rl_accel.pyd : fatal error LNK1120: 69 unresolved externals

I assume I can get those from a working Python amd64 install and stuff on one of 
the compiler paths somehow.
-- 
Robin Becker



From news1234 at free.fr  Fri Mar 12 06:44:27 2010
From: news1234 at free.fr (News123)
Date: Fri, 12 Mar 2010 12:44:27 +0100
Subject: show image in python
In-Reply-To: <mailman.616.1268320154.23598.python-list@python.org>
References: <d698368f1003101403t519b5efdt94892902026aee0b@mail.gmail.com>
	<mailman.616.1268320154.23598.python-list@python.org>
Message-ID: <4b9a291b$0$21425$426a74cc@news.free.fr>

Philip Semanchuk wrote:
> 
> On Mar 10, 2010, at 5:03 PM, mohamed issolah wrote:
> 
>> Hey, This is my program
>>

>> 18 def Creeimg():
>> 19         """transforme matrice en image"""
>> 20         img = Image.new ("L",(8,8))
>> 21         matrix = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
>> 22         img.putdata(matrix)
>> 23         img.show()
>> 24         img.save(fp="./ana.bmp")
>> 25

>>
>> My probeleme : In line 23 "img.show()" Don't work, normally I show the
>> image

Image show is implemented rather half heartedly (at least on linux)

a potential reasons is:
- you didn not install the correct image viewer tool (You should see an
error message though". Then you could try to install the tool, that
python did not find.


depending on the platform, you might have bugs, that don't allow to view
more than one image at a time / etc.

potentially you might be better of by just using
a hand rolled os.system()
or subprocess.Popen call


bye

N





>> but it's not work, but strangely in line 24 "img.save(fp="./ana.bmp")"
>> it's
>> work
>> WHERE IS THE PROBLEME.
>>
>> I have this error in shell : "(eog:3176): GLib-WARNING **: GError set
>> over
>> the top of a previous GError or uninitialized memory.
>> This indicates a bug in someone's code. You must ensure an error is NULL
>> before it's set.
>> The overwriting error message was: Error in getting image file info "
>>
>>
>> os: ubuntu 9.10
> 
> Hi issolah,
> I don't know what your problem is but I have a few suggestions --
> 1) You say that img.show() doesn't work. How does it fail? Is that where
> you get the GLib warning?
> 2) I'm glad you posted your code, but because it has line numbers, it's
> awkward to copy & paste into a local example. Please show your code
> without line numbers.
> 
> I'm unfamiliar with PIL, so this is just a wild guess, but based on the
> GLib error it seems like you haven't initialized something properly.
> Sorry I couldn't be more helpful. Maybe someone who knows more will answer.
> 
> Good luck
> Philip
> 
> 
> 
> 
> 


From steve at REMOVE-THIS-cybersource.com.au  Fri Mar 12 07:35:57 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 12 Mar 2010 12:35:57 GMT
Subject: Unicode characters in btye-strings
Message-ID: <4b9a352d$0$27822$c3e8da3@news.astraweb.com>

I know this is wrong, but I'm not sure just how wrong it is, or why. 
Using Python 2.x:

>>> s = "???"
>>> print s
???
>>> len(s)
6
>>> list(s)
['\xc3', '\xa9', '\xc3', '\xa2', '\xc3', '\x84']

Can somebody explain what happens when I put non-ASCII characters into a 
non-unicode string? My guess is that the result will depend on the 
current encoding of my terminal.

In this case, my terminal is set to UTF-8. If I change it to ISO 8859-1, 
and repeat the above, I get this:

>>> list("???")
['\xe9', '\xe2', '\xc4']

If I do this:

>>> s = u"???"
>>> s.encode('utf-8')
'\xc3\xa9\xc3\xa2\xc3\x84'
>>> s.encode('iso8859-1')
'\xe9\xe2\xc4'

which at least explains why the bytes have the values which they do.


Thank you,



-- 
Steven


From jeanmichel at sequans.com  Fri Mar 12 07:51:43 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 12 Mar 2010 13:51:43 +0100
Subject: Need advice on starting a Python group
In-Reply-To: <4b9a2806$0$22047$426a74cc@news.free.fr>
References: <hnb0d1$2el$1@reader1.panix.com>	<mailman.653.1268385271.23598.python-list@python.org>
	<4b9a2806$0$22047$426a74cc@news.free.fr>
Message-ID: <4B9A38DF.1020208@sequans.com>

News123 wrote:
> Jonathan Gardner wrote:
>   
>> On Thu, Mar 11, 2010 at 6:57 AM, gb345 <gb345 at invalid.com> wrote:
>>     
>>> And even when we've had volunteers, hardly anyone shows up!
>>>
>>> Any suggestions would be appreciated.
>>>
>>>       
>> Two things: One, only you and your friend really care. Let that sink
>> in. No one is going to carry the group but you two, at least
>> initially.
>>
>> Two, there's a lot of people at movie theaters and the county fair.
>> Why? Because it is interesting and fun. Scientists work the same way.
>> Yes, a lot of people are interested in Python. Why don't you do a bit
>> of snooping around and see what people want to know about?
>>
>> Let me give some examples:
>>
>> * Interactive numeric programming with Python
>> * Rapid website development with Pylons (Trust me, everyone wants to
>> make a website.) Show how you are showing off data from one of your
>> experiments of projects and how easy it is to organize and manage
>> data.
>> * How you used Python on your latest and greatest project
>>
>> Don't expect the audience to participate, except to show up and ask questions.
>>
>> If you want to build a Python support group, then form an informal
>> group with your friends. Start a public mailing list and offer Python
>> advice and support for free. Integrate whatever code your org has with
>> Python, and manage and maintain that code so others can use it.
>>
>> Finally, advertise. The more people see "Python", the more they will
>> be interested. Coca-cola and Pepsi are really good at this!
>>
>>     
>
>
> attendance will be very low and be sure nobody cares to check whether
> anything happened on this group.
>
> My suggestion is:
>
>
> I'd suggest to setup a group, to which one can subscribe with mail
> notification and for all the old ones perhaps even via nntp ;-) and of
> course via a web front end (though I personally hate web groups)
>
> Afterwards you can 'friendly-fore-subscribe' some collegues. ;-)
> Just talk about your new cool group during lunch, etc.
>
> Be sure, that most will be to lazy to unsuscribe.
>
> Start discussing interesting topics on this group and then . . .
> maybe others start joining. maybo nobody cares and you have just to
> accept it.
>
> bye
>
>
> N
>   
Python is not interesting enough by itself to grab students attention. 
It's just a tool to solve some technical problems.

So, either python has a direct benefit on the study itself (meaning it 
can help getting better results), or you'll have to make it intereseting 
as a hobbit. But python is not music, video, dance nor it is related to 
sport, sex or whatever things that usually interest people. So I really 
don't know how to make it interesting, I'm not sure it's even possible 
nor desirable.

Good luck anyway.

JM




From hv at tbz-pariv.de  Fri Mar 12 07:59:54 2010
From: hv at tbz-pariv.de (Thomas Guettler)
Date: Fri, 12 Mar 2010 13:59:54 +0100
Subject: Parsing Email Headers
In-Reply-To: <6e0f6857-bedd-4b23-81af-69dd06a53764@q15g2000yqj.googlegroups.com>
References: <e574cbf6-d7e8-49e8-be87-93c9a59e3d87@z35g2000yqd.googlegroups.com>
	<mailman.633.1268338431.23598.python-list@python.org>
	<91153e11-2980-4218-bc88-c92bda7d517e@z11g2000yqz.googlegroups.com>
	<mailman.636.1268348804.23598.python-list@python.org>
	<6e0f6857-bedd-4b23-81af-69dd06a53764@q15g2000yqj.googlegroups.com>
Message-ID: <7vus6aFm6qU1@mid.individual.net>

T wrote:
> Thanks for your suggestions!  Here's what seems to be working - it's
> basically the same thing I originally had, but first checks to see if
> the line is blank
> 
>                 response, lines, bytes = M.retr(i+1)
>                 # For each line in message
>                 for line in lines:
>                     if not line.strip():
>                         M.dele(i+1)
>                         break
> 
>                     emailMessage = email.message_from_string(line)
>                     # Get fields
>                     fields = emailMessage.keys()
>                     # If email contains "From" field
>                     if emailMessage.has_key("From"):
>                         # Get contents of From field
>                         from_field = emailMessage.__getitem__("From")

Hi T,

wait, this code looks strange.

You delete the email if it contains an empty line? I use something like this:

message='\n'.join(connection.retr(msg_num)[1])

Your code:
emailMessage = email.message_from_string(line)
create an email object from only *one* line!

You retrieve the whole message (you don't save bandwith), but maybe that's
what you want.


  Thomas

-- 
Thomas Guettler, http://www.thomas-guettler.de/
E-Mail: guettli (*) thomas-guettler + de


From steve at holdenweb.com  Fri Mar 12 08:04:19 2010
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 12 Mar 2010 08:04:19 -0500
Subject: Need advice on starting a Python group
In-Reply-To: <4B9A38DF.1020208@sequans.com>
References: <hnb0d1$2el$1@reader1.panix.com>	<mailman.653.1268385271.23598.python-list@python.org>	<4b9a2806$0$22047$426a74cc@news.free.fr>
	<4B9A38DF.1020208@sequans.com>
Message-ID: <hnde5h$92d$1@dough.gmane.org>

Jean-Michel Pichavant wrote:
> News123 wrote:
>> Jonathan Gardner wrote:
>>  
>>> On Thu, Mar 11, 2010 at 6:57 AM, gb345 <gb345 at invalid.com> wrote:
>>>    
>>>> And even when we've had volunteers, hardly anyone shows up!
>>>>
>>>> Any suggestions would be appreciated.
>>>>
>>>>       
>>> Two things: One, only you and your friend really care. Let that sink
>>> in. No one is going to carry the group but you two, at least
>>> initially.
>>>
>>> Two, there's a lot of people at movie theaters and the county fair.
>>> Why? Because it is interesting and fun. Scientists work the same way.
>>> Yes, a lot of people are interested in Python. Why don't you do a bit
>>> of snooping around and see what people want to know about?
>>>
>>> Let me give some examples:
>>>
>>> * Interactive numeric programming with Python
>>> * Rapid website development with Pylons (Trust me, everyone wants to
>>> make a website.) Show how you are showing off data from one of your
>>> experiments of projects and how easy it is to organize and manage
>>> data.
>>> * How you used Python on your latest and greatest project
>>>
>>> Don't expect the audience to participate, except to show up and ask
>>> questions.
>>>
>>> If you want to build a Python support group, then form an informal
>>> group with your friends. Start a public mailing list and offer Python
>>> advice and support for free. Integrate whatever code your org has with
>>> Python, and manage and maintain that code so others can use it.
>>>
>>> Finally, advertise. The more people see "Python", the more they will
>>> be interested. Coca-cola and Pepsi are really good at this!
>>>
>>>     
>>
>>
>> attendance will be very low and be sure nobody cares to check whether
>> anything happened on this group.
>>
>> My suggestion is:
>>
>>
>> I'd suggest to setup a group, to which one can subscribe with mail
>> notification and for all the old ones perhaps even via nntp ;-) and of
>> course via a web front end (though I personally hate web groups)
>>
>> Afterwards you can 'friendly-fore-subscribe' some collegues. ;-)
>> Just talk about your new cool group during lunch, etc.
>>
>> Be sure, that most will be to lazy to unsuscribe.
>>
>> Start discussing interesting topics on this group and then . . .
>> maybe others start joining. maybo nobody cares and you have just to
>> accept it.
>>
>> bye
>>
>>
>> N
>>   
> Python is not interesting enough by itself to grab students attention.
> It's just a tool to solve some technical problems.
> 
> So, either python has a direct benefit on the study itself (meaning it
> can help getting better results), or you'll have to make it intereseting
> as a hobbit. But python is not music, video, dance nor it is related to
> sport, sex or whatever things that usually interest people. So I really
> don't know how to make it interesting, I'm not sure it's even possible
> nor desirable.
> 
> Good luck anyway.
> 
> JM
> 
> 
All the advice you have had is good. You need to turn around your
enthusiasm and look at it from the potential visitor's point of view -
what's in it for them?

You don't say where you are (and your invalid domain doesn't really help
identify that), but if you have any of the superstars from the
scientific Python world around you, invite one of them as a guest speaker.

Take a look on the web - e.g. in pycon.blip.tv, where all the PyCon
talks for the last two years are available. Maybe you could start each
meeting by showing one of those videos? Also take a look to see what
SciPy conferences have made available (though I don't think they do
videos yet).

The PSF has invested hugely in making that information available, and
the more they get used the happier we will be. But mostly it's a matter
of focusing on what your community needs from the group, and providing that.

Good luck!

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Fri Mar 12 08:07:00 2010
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 12 Mar 2010 08:07:00 -0500
Subject: Anything like "Effective Java" for Python?
In-Reply-To: <a3dc3481003120059r35abd3b7of83c8aafd84bdb67@mail.gmail.com>
References: <hn8d98$m0d$1@reader1.panix.com>
	<a3dc3481003120059r35abd3b7of83c8aafd84bdb67@mail.gmail.com>
Message-ID: <hndeai$92d$2@dough.gmane.org>

Neo wrote:
> I have learned java for half a year and now I want to learn Python,
> should I learn python 3k or the traditional version?
> 
That depends on whether you need to use specific libraries that haven't
yet been ported to Python 3. If so then start with Python 2. If not,
start with 3 - the differences are small enough that you can relatively
easily fall back to 2 if you need to get access to non-ported libraries.

regards
 Steve

> On Wed, Mar 10, 2010 at 7:19 AM, kj <no.email at please.post> wrote:
> 
> 
> 
> 
>     Subject line pretty much says it all: is there a book like "Effective
>     Java" for Python.  I.e. a book that assumes that readers are
>     experienced programmers that already know the basics of the language,
>     and want to focus on more advanced programming issues?
> 
>     ~K
>     --
>     http://mail.python.org/mailman/listinfo/python-list
> 
> 


-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Fri Mar 12 08:15:49 2010
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 12 Mar 2010 08:15:49 -0500
Subject: execute bash builtins in python
In-Reply-To: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com>
References: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com>
Message-ID: <hnder4$bvg$1@dough.gmane.org>

alex goretoy wrote:
> hi,
> i'm trying to write a section of my program that needs to run bash
> builtin alias and declare, i've googled and tried every type of example
> i could find no to avail. this is what I've tried below and it doesn't
> work, is there a way for me to execute a bah builin from python? what i
> need is to take alias output and pipe it to another command with python
> and return the results to a string or list.
> 
>>>> p1=Popen(["alias"],stdout=PIPE)
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/usr/lib/python2.6/subprocess.py", line 621, in __init__
>     errread, errwrite)
>   File "/usr/lib/python2.6/subprocess.py", line 1126, in _execute_child
>     raise child_exception
> OSError: [Errno 2] No such file or directory
> 
> if i add shell=True i get empty string and no thins error message
> 
>>>> p1=Popen(["alias"],stdout=PIPE,shell=True)
>>>> p1
> <subprocess.Popen object at 0xb7589a4c>
>>>> p1.stdout.read()
> ''
> 
> thank you,
> -Alex Goretoy
> 
For shell=True I believe you should provide the command as a single
string, not a list of arguments.

>>> p1 = Popen("alias", stdout=PIPE, shell=True)
>>>

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From bartc at freeuk.com  Fri Mar 12 08:38:07 2010
From: bartc at freeuk.com (bartc)
Date: Fri, 12 Mar 2010 13:38:07 GMT
Subject: Need advice on starting a Python group
In-Reply-To: <hnb0d1$2el$1@reader1.panix.com>
References: <hnb0d1$2el$1@reader1.panix.com>
Message-ID: <3trmn.49663$Ym4.35065@text.news.virginmedia.com>


"gb345" <gb345 at invalid.com> wrote in message 
news:hnb0d1$2el$1 at reader1.panix.com...

> A friend of mine and I have been trying to start a
> scientific-programming-oriented Python group in our school (of
> medecine and bio research), with not much success.
>
> The main problem is attendance.  Even though a *ton* of people have
> told us that it's a great idea, that they're *very* interested,
> and have asked to be added to our mailing list, the attendance to
> our first few meeting has never been more than 5, including my
> friend and I.  Last time just he and I showed up.
...
> Still, we have a hard time finding volunteers.
>
> And even when we've had volunteers, hardly anyone shows up!
>
> Any suggestions would be appreciated.

Try and get a girl or two interested in coming to the meetings...

-- 
Bartc





From python at mrabarnett.plus.com  Fri Mar 12 08:40:23 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Fri, 12 Mar 2010 13:40:23 +0000
Subject: StringChain -- a data structure for managing large sequences
	of 	chunks of bytes
In-Reply-To: <4b9a00ce$0$27822$c3e8da3@news.astraweb.com>
References: <mailman.646.1268377905.23598.python-list@python.org>
	<4b9a00ce$0$27822$c3e8da3@news.astraweb.com>
Message-ID: <4B9A4447.8010500@mrabarnett.plus.com>

Steven D'Aprano wrote:
> On Fri, 12 Mar 2010 00:11:37 -0700, Zooko O'Whielacronx wrote:
> 
>> Folks:
>>
>> Every couple of years I run into a problem where some Python code that
>> worked well at small scales starts burning up my CPU at larger scales,
>> and the underlying issue turns out to be the idiom of accumulating data
>> by string concatenation. 
> 
> I don't mean to discourage you, but the simple way to avoid that is not 
> to accumulate data by string concatenation.
> 
> The usual Python idiom is to append substrings to a list, then once, at 
> the very end, combine into a single string:
> 
> 
> accumulator = []
> for item in sequence:
>     accumulator.append(process(item))
> string = ''.join(accumulator)
> 
> 
>> It just happened again
>> (http://foolscap.lothar.com/trac/ticket/149 ), and as usual it is hard
>> to make the data accumulator efficient without introducing a bunch of
>> bugs into the surrounding code.
> 
> I'm sorry, I don't agree about that at all. I've never come across a 
> situation where I wanted to use string concatenation and couldn't easily 
> modify it to use the list idiom above.
> 
> [...]
>> Here are some benchmarks generated by running python -OOu -c 'from
>> stringchain.bench import bench; bench.quick_bench()' as instructed by
>> the README.txt file.
> 
> To be taken seriously, I think you need to compare stringchain to the 
> list idiom. If your benchmarks favourably compare to that, then it might 
> be worthwhile.
> 
IIRC, someone did some work on making concatenation faster by delaying
it until a certain threshold had been reached (in the string class
implementation).


From hiralsmaillist at gmail.com  Fri Mar 12 08:49:04 2010
From: hiralsmaillist at gmail.com (hiral)
Date: Fri, 12 Mar 2010 05:49:04 -0800 (PST)
Subject: result of os.times() is different with 'time' command Options
Message-ID: <16861cbc-4460-4d67-ab46-ff03517173d4@g8g2000pri.googlegroups.com>

Hi,

Python version: 2.6

Script:
def pt(start_time, end_time):
    def ptime(time, time_str):
        min, sec = divmod(time, 60)
        hr, min = divmod(min, 60)
        stmt = time_str + '\t'
        if hr:
            stmt += str(hr) + 'h'
        stmt += str(min) + 'm' + str(sec) + 's'
        print stmt

    if start_time and end_time:
        real_time  = end_time[4] - start_time[4]
        ptime(real_time, "real")
        user_time  = end_time[0] - start_time[0]
        ptime(user_time, "user")
        sys_time   = end_time[1] - start_time[1]
        ptime(sys_time, "sys")

import os, subprocess
cmd = ['ls']
print cmd
t1 = os.times()
subprocess.call(cmd)
t2 = os.times()
pt(t1, t2)
print ".end"


Output:
real    0.0m0.0100000002421s
user    0.0m0.0s
sys     0.0m0.0s


Command:
$ time ls

Output:
real    0m0.007s
user    0m0.000s
sys     0m0.000s


Is this the intended behaviour?

As per the link <http://groups.google.com/group/comp.lang.python/
browse_thread/thread/8032897a30781df/c656a79d4c3268a6> it was fixed in
python 2.5.

Can anybody help.

Thank you.






From hiralsmaillist at gmail.com  Fri Mar 12 08:56:34 2010
From: hiralsmaillist at gmail.com (hiral)
Date: Fri, 12 Mar 2010 05:56:34 -0800 (PST)
Subject: python module/utility equivalent to 'time' (linux) and/or 
	'ntimer'(Windows)
Message-ID: <01b0d61b-eb5f-44dc-862e-e31d64b3b0e9@k24g2000pro.googlegroups.com>

Hi,

Is there any python module/utility available which would report the
time same as 'time' command in linux and/or report time same as
'ntimer' utility in Windows.

Thank you.


From hiralsmaillist at gmail.com  Fri Mar 12 08:59:18 2010
From: hiralsmaillist at gmail.com (hiral)
Date: Fri, 12 Mar 2010 05:59:18 -0800 (PST)
Subject: to create variable from dict
Message-ID: <4859ed52-7276-4617-b25e-902b52cfe7c5@s36g2000prh.googlegroups.com>

Hi,

Is there any way to create variables which name matches with dict key?

For example:
dict1 = {"abc":'1", "def":"2"}

Now I am looking to have variable name abc and it's value be '1' etc.

Pl. suggest.

Thank you.


From felix.antoine.fortin at gmail.com  Fri Mar 12 09:08:09 2010
From: felix.antoine.fortin at gmail.com (=?ISO-8859-1?Q?F=E9lix=2DAntoine_Fortin?=)
Date: Fri, 12 Mar 2010 06:08:09 -0800 (PST)
Subject: inspect.stack() and frame
References: <6f3a93d6-5608-467f-a7db-d360a34fe856@i25g2000yqm.googlegroups.com>
	<hnbtus$p5s$1@news.eternal-september.org>
	<4988c974-c8d2-46c9-8c57-681ad22fc1bc@upsg2000gro.googlegroups.com>
	<mailman.644.1268374305.23598.python-list@python.org>
Message-ID: <b554e528-b6d5-4ffb-bcfa-04a8712cd676@q23g2000yqd.googlegroups.com>

Thanks Gabriel, you resumed quite well what I did discovered after my
second post
by playing with the garbage collector module.

> (The garbage collector will, ?
> eventually, break the cycle and free those objects, but not very soon).

I'm not very familiar with the Python garbage collector, so you may
excuse my
simple question, but how can it break the cycle? I guess the object
will be
freed at least when the program ends, but could it be before that? Is
there a
mechanisme in the garbage collector to detect circular references?

Felix




From albert at spenarnc.xs4all.nl  Fri Mar 12 09:13:55 2010
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 12 Mar 2010 14:13:55 GMT
Subject: Python dos2unix one liner
References: <mailman.323.1267263408.4577.python-list@python.org>
	<4b8a2dde$0$27844$c3e8da3@news.astraweb.com>
	<mailman.13.1267355406.23598.python-list@python.org>
	<hmdlc0$ocq$1@news.eternal-september.org>
Message-ID: <kz6a77.jwy@spenarnc.xs4all.nl>

In article <hmdlc0$ocq$1 at news.eternal-september.org>,
Martin P. Hellwig <martin.hellwig at dcuktec.org> wrote:
>On 02/28/10 11:05, Stefan Behnel wrote:
>> Steven D'Aprano, 28.02.2010 09:48:
>>> There ought to be some kind of competition for the least efficient
>>> solution to programming problems
>>
>> That wouldn't be very interesting. You could just write a code generator
>> that spits out tons of garbage code including a line that solves the
>> problem, and then let it execute the code afterwards. That beast would
>> always win.
>>
>> Stefan
>>
>Well that would be an obvious rule that garbage code that does not
>contribute to the end result (ie can be taken out without affecting the
>end result) would not be allowed. Enforcing the rule is another beast
>though, but I would leave that to the competition.

Thinking of the international obfuscated c contest (iocc).
It is easy to make a mess of a program using the preprocessor.
It is also easy to preprocess then prettyprint the program.
If the result is not obfuscated, it impresses nobody.
Likewise the judges would think nothing of a program with garbage,
and would rate it low, so such rule is unnecessary.

>
>Though the idea of a code generator is solid, but instead of generating
>garbage, produces a virtual machine that implements a generator that
>produces a virtual machine, etc. etc.

That was actually done by Lennart Benschop. He made a Forth program
run by an interpreter written in C.
Although Forthers thought it was straightforward comprehensible
code, it was a winner in the iocc.

>
>--
>mph

Groetjes Albert

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- being exponential -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From emile at fenx.com  Fri Mar 12 09:22:23 2010
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 12 Mar 2010 06:22:23 -0800
Subject: Reverse engineering CRC?
In-Reply-To: <7vum06Fj82U1@mid.individual.net>
References: <7vj7fdFnnjU1@mid.individual.net>	<4b9471ee$0$8836$c3e8da3@news.astraweb.com>	<7vk3eiFtivU1@mid.individual.net>	<mailman.459.1268053659.23598.python-list@python.org>	<7vlameF7goU1@mid.individual.net>
	<hncbn9$vkr$3@lust.ihug.co.nz> <7vum06Fj82U1@mid.individual.net>
Message-ID: <hndiji$nva$1@dough.gmane.org>

On 3/12/2010 3:24 AM Gregory Ewing said...
> What confused me initially is that it seems to be adding
> a few extra bytes to the checked data that aren't present
> in the file. Figuring out what they're supposed to contain
> is proving to be quite a headache...

Length?

Emile





From darcy at druid.net  Fri Mar 12 09:30:51 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Fri, 12 Mar 2010 09:30:51 -0500
Subject: NoSQL Movement?
In-Reply-To: <6cc20cea1003120105j626cc519o2271106e088b2e90@mail.gmail.com>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<mailman.256.1267655008.23598.python-list@python.org>
	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
	<6cc20cea1003120105j626cc519o2271106e088b2e90@mail.gmail.com>
Message-ID: <20100312093051.75022620.darcy@druid.net>

On Fri, 12 Mar 2010 01:05:27 -0800
Jonathan Gardner <jgardner at jonathangardner.net> wrote:
> Let me give you an example. I worked on a system that would load
> recipients for email campaigns into a database table. The SQL database
> was nice during the initial design and prototype stage because we
> could quickly adjust the tables to add or remove columns and try out
> different designs.. However, once our system got popular, the
> limitation was how fast we could load recipients into the database.

Just curious, what database were you using that wouldn't keep up with
you?  I use PostgreSQL and would never consider going back to flat
files.  The only thing I can think of that might make flat files faster
is that flat files are buffered whereas PG guarantees that your
information is written to disk before returning but if speed is more
important than 100% reliability you can turn that off and let PG use
the file system buffering just like flat files.

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


From python.list at tim.thechases.com  Fri Mar 12 09:40:52 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Fri, 12 Mar 2010 08:40:52 -0600
Subject: to create variable from dict
In-Reply-To: <4859ed52-7276-4617-b25e-902b52cfe7c5@s36g2000prh.googlegroups.com>
References: <4859ed52-7276-4617-b25e-902b52cfe7c5@s36g2000prh.googlegroups.com>
Message-ID: <4B9A5274.7080301@tim.thechases.com>

hiral wrote:
> Is there any way to create variables which name matches with dict key?
> 
> For example:
> dict1 = {"abc":'1", "def":"2"}
> 
> Now I am looking to have variable name abc and it's value be '1' etc.

1) you can't because "def" is a reserved word in Python.

2) why do you want to?  This seems to come up about every week or 
so and people STILL want to do it.  Search the archives...you 
won't have to go back too far.

3) once you have it, how do you plan to use the variables?  If 
you don't know what they'll be named ahead of time, how can you 
use them in your code

The usual answer is "don't do that -- just use them as a dict", 
or if you're trying to set up some constants, you can use

   abc, def_, ghi = 1, 2, 3

-tkc









From luismgz at gmail.com  Fri Mar 12 09:50:18 2010
From: luismgz at gmail.com (=?ISO-8859-1?Q?Luis_M=2E_Gonz=E1lez?=)
Date: Fri, 12 Mar 2010 06:50:18 -0800 (PST)
Subject: to create variable from dict
References: <4859ed52-7276-4617-b25e-902b52cfe7c5@s36g2000prh.googlegroups.com>
Message-ID: <ecc59606-b4c2-418f-9cb2-27e9b2c47714@o30g2000yqb.googlegroups.com>

On Mar 12, 10:59?am, hiral <hiralsmaill... at gmail.com> wrote:
> Hi,
>
> Is there any way to create variables which name matches with dict key?
>
> For example:
> dict1 = {"abc":'1", "def":"2"}
>
> Now I am looking to have variable name abc and it's value be '1' etc.
>
> Pl. suggest.
>
> Thank you.

Check out this thread (very recent):
http://groups.google.com/group/comp.lang.python/browse_thread/thread/bb1797ffb6fc3bd7/25fe94103c7a231f?lnk=gst&q=luis+variables#25fe94103c7a231f

Short answer: you can update globals() with a dictionary, as follows:

globals().update( dict1 )

Then you'll have each key-value pair as variables in the global
namespace.
The question is: should you do it?

Luis


From jeanmichel at sequans.com  Fri Mar 12 10:02:24 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 12 Mar 2010 16:02:24 +0100
Subject: to create variable from dict
In-Reply-To: <ecc59606-b4c2-418f-9cb2-27e9b2c47714@o30g2000yqb.googlegroups.com>
References: <4859ed52-7276-4617-b25e-902b52cfe7c5@s36g2000prh.googlegroups.com>
	<ecc59606-b4c2-418f-9cb2-27e9b2c47714@o30g2000yqb.googlegroups.com>
Message-ID: <4B9A5780.90005@sequans.com>

Luis M. Gonz?lez wrote:
> On Mar 12, 10:59 am, hiral <hiralsmaill... at gmail.com> wrote:
>   
>> Hi,
>>
>> Is there any way to create variables which name matches with dict key?
>>
>> For example:
>> dict1 = {"abc":'1", "def":"2"}
>>
>> Now I am looking to have variable name abc and it's value be '1' etc.
>>
>> Pl. suggest.
>>
>> Thank you.
>>     
>
> Check out this thread (very recent):
> http://groups.google.com/group/comp.lang.python/browse_thread/thread/bb1797ffb6fc3bd7/25fe94103c7a231f?lnk=gst&q=luis+variables#25fe94103c7a231f
>
> Short answer: you can update globals() with a dictionary, as follows:
>
> globals().update( dict1 )
>
> Then you'll have each key-value pair as variables in the global
> namespace.
> The question is: should you do it?
>
> Luis
>   
The answer is known: no, he should not do it :o)

JM


From pemerson at gmail.com  Fri Mar 12 10:15:16 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 12 Mar 2010 07:15:16 -0800 (PST)
Subject: Exiting gracefully from ThreadingTCPServer
Message-ID: <1f31cddf-1104-4579-bd61-5fad3b2c4677@t17g2000prg.googlegroups.com>

I'm trying to get threading going for the first time in python, and
I'm trying to modify code I found so that I can have the server close
the TCP connections and exit gracefully. Two problems:

1) While the KeyboardInterrupt works, if I make more than 0 curls to
the server and then quit, I can't run it again right away and get
this:
socket.error: [Errno 48] Address already in use

Not all of my connections are closing properly. How do I fix this?

2) curling localhost:8080/quit does show the "Quitting" output that I
expect, but doesn't quit the server until I manually control-c it.

I think that I need *all* threads to close and not just the current
one, so I'm not quite sure how to proceed. Pointers in the right
direction are appreciated. And if there's a "better" way to do this
threading httpd server (subjective, I realize), please let me know!
Thanks.

Pete

#############################################
#!/usr/bin/env python

import SocketServer
import SimpleHTTPServer

PORT = 8080
done = False
class CustomHandler(SimpleHTTPServer.SimpleHTTPRequestHandler):
    def do_GET(self):
	global done
	if self.path=='/quit':
            self.send_response(200)
            self.send_header('Content-type','text/html')
            self.end_headers()
            self.wfile.write('Quitting')
            done = True
            return self
        else:
            self.send_response(200)
            self.send_header('Content-type','text/html')
            self.end_headers()
            self.wfile.write('Unknown')
            return self


if __name__ == "__main__":
	httpd = SocketServer.ThreadingTCPServer(('localhost',
PORT),CustomHandler)
	try:
		while not done:
			print "done: ", done
			httpd.handle_request()
	except KeyboardInterrupt:
		print "Server is done."
		httpd.server_close()


From robert.kern at gmail.com  Fri Mar 12 10:37:36 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 12 Mar 2010 09:37:36 -0600
Subject: Unicode characters in btye-strings
In-Reply-To: <4b9a352d$0$27822$c3e8da3@news.astraweb.com>
References: <4b9a352d$0$27822$c3e8da3@news.astraweb.com>
Message-ID: <hndn40$9ve$1@dough.gmane.org>

On 2010-03-12 06:35 AM, Steven D'Aprano wrote:
> I know this is wrong, but I'm not sure just how wrong it is, or why.
> Using Python 2.x:
>
>>>> s = "???"
>>>> print s
> ???
>>>> len(s)
> 6
>>>> list(s)
> ['\xc3', '\xa9', '\xc3', '\xa2', '\xc3', '\x84']
>
> Can somebody explain what happens when I put non-ASCII characters into a
> non-unicode string? My guess is that the result will depend on the
> current encoding of my terminal.

Exactly right.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From robin at reportlab.com  Fri Mar 12 10:44:12 2010
From: robin at reportlab.com (Robin Becker)
Date: Fri, 12 Mar 2010 15:44:12 +0000
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
In-Reply-To: <4B9A2810.9030602@chamonix.reportlab.co.uk>
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>	<mailman.619.1268324988.23598.python-list@python.org>	<4B992FB5.8090207@v.loewis.de>
	<4B9A2810.9030602@chamonix.reportlab.co.uk>
Message-ID: <4B9A614C.1080105@chamonix.reportlab.co.uk>

On 12/03/2010 11:40, Robin Becker wrote:
........
>
> I assume I can get those from a working Python amd64 install and stuff
> on one of the compiler paths somehow.


Not sure if this is a bug; I dug around a bit and find that because of the cross 
compilation distutils is supposed to add an extra library path with the name 
PCbuild\AMD64 when doing x86-->amd64 cross builds.

I tried copying the 2.6.4 amd64 libs/dlls etc etc into c:\python26\PCbuild\AMD64 
and reran my cross build

c:\python26\python setup.py build --plat-name=win-amd64

however, that still gives linker import errors.

Looked in the output I see this

> C:\Program Files\Microsoft Visual Studio 9.0\VC\BIN\x86_amd64\link.exe /DLL /nologo /INCREMENTAL:NO /LIBPATH:C:\python26
> \libs /LIBPATH:C:\python26\PCbuild\amd64 /EXPORT:init_rl_accel build\temp.win-amd64-2.6\Release\_rl_accel.obj /OUT:build
> \lib.win-amd64-2.6\_rl_accel.pyd /IMPLIB:build\temp.win-amd64-2.6\Release\_rl_accel.lib /MANIFESTFILE:build\temp.win-amd
> 64-2.6\Release\_rl_accel.pyd.manifest
>    Creating library build\temp.win-amd64-2.6\Release\_rl_accel.lib and object build\temp.win-amd64-2.6\Release\_rl_accel
> .exp
> _rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyNumber_Int referenced in function _parseSequenceInt
> _rl_accel.obj : error LNK2019: unresolved external symbol __imp_PySequence_GetItem referenced in function _parseSequence


that looks wrong because I'm using 32 bit python to do the build and

/LIBPATH:C:\python26\libs /LIBPATH:C:\python26\PCbuild\amd64

means that the 32 bit libraries are first. Running the linker command by itself 
(without the 32bit libs in the command) works fine ie

> C:\ux\PydBuilder\rl_addons\rl_accel>"C:\Program Files\Microsoft Visual Studio 9.0\VC\BIN\x86_amd64\link.exe" /DLL /nolog
> o /INCREMENTAL:NO /LIBPATH:C:\python26\PCbuild\amd64 /EXPORT:init_rl_accel build\temp.win-amd64-2.6\Release\_rl_accel.ob
> j /OUT:build\lib.win-amd64-2.6\_rl_accel.pyd /IMPLIB:build\temp.win-amd64-2.6\Release\_rl_accel.lib /MANIFESTFILE:build\
> temp.win-amd64-2.6\Release\_rl_accel.pyd.manifest
>    Creating library build\temp.win-amd64-2.6\Release\_rl_accel.lib and object build\temp.win-amd64-2.6\Release\_rl_accel
> .exp

seems to work fine and produce a pyd in build\lib.win-amd64-2.6
-- 
Robin Becker


From robin at reportlab.com  Fri Mar 12 10:44:12 2010
From: robin at reportlab.com (Robin Becker)
Date: Fri, 12 Mar 2010 15:44:12 +0000
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
In-Reply-To: <4B9A2810.9030602@chamonix.reportlab.co.uk>
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>	<mailman.619.1268324988.23598.python-list@python.org>	<4B992FB5.8090207@v.loewis.de>
	<4B9A2810.9030602@chamonix.reportlab.co.uk>
Message-ID: <4B9A614C.1080105@chamonix.reportlab.co.uk>

On 12/03/2010 11:40, Robin Becker wrote:
........
>
> I assume I can get those from a working Python amd64 install and stuff
> on one of the compiler paths somehow.


Not sure if this is a bug; I dug around a bit and find that because of the cross 
compilation distutils is supposed to add an extra library path with the name 
PCbuild\AMD64 when doing x86-->amd64 cross builds.

I tried copying the 2.6.4 amd64 libs/dlls etc etc into c:\python26\PCbuild\AMD64 
and reran my cross build

c:\python26\python setup.py build --plat-name=win-amd64

however, that still gives linker import errors.

Looked in the output I see this

> C:\Program Files\Microsoft Visual Studio 9.0\VC\BIN\x86_amd64\link.exe /DLL /nologo /INCREMENTAL:NO /LIBPATH:C:\python26
> \libs /LIBPATH:C:\python26\PCbuild\amd64 /EXPORT:init_rl_accel build\temp.win-amd64-2.6\Release\_rl_accel.obj /OUT:build
> \lib.win-amd64-2.6\_rl_accel.pyd /IMPLIB:build\temp.win-amd64-2.6\Release\_rl_accel.lib /MANIFESTFILE:build\temp.win-amd
> 64-2.6\Release\_rl_accel.pyd.manifest
>    Creating library build\temp.win-amd64-2.6\Release\_rl_accel.lib and object build\temp.win-amd64-2.6\Release\_rl_accel
> .exp
> _rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyNumber_Int referenced in function _parseSequenceInt
> _rl_accel.obj : error LNK2019: unresolved external symbol __imp_PySequence_GetItem referenced in function _parseSequence


that looks wrong because I'm using 32 bit python to do the build and

/LIBPATH:C:\python26\libs /LIBPATH:C:\python26\PCbuild\amd64

means that the 32 bit libraries are first. Running the linker command by itself 
(without the 32bit libs in the command) works fine ie

> C:\ux\PydBuilder\rl_addons\rl_accel>"C:\Program Files\Microsoft Visual Studio 9.0\VC\BIN\x86_amd64\link.exe" /DLL /nolog
> o /INCREMENTAL:NO /LIBPATH:C:\python26\PCbuild\amd64 /EXPORT:init_rl_accel build\temp.win-amd64-2.6\Release\_rl_accel.ob
> j /OUT:build\lib.win-amd64-2.6\_rl_accel.pyd /IMPLIB:build\temp.win-amd64-2.6\Release\_rl_accel.lib /MANIFESTFILE:build\
> temp.win-amd64-2.6\Release\_rl_accel.pyd.manifest
>    Creating library build\temp.win-amd64-2.6\Release\_rl_accel.lib and object build\temp.win-amd64-2.6\Release\_rl_accel
> .exp

seems to work fine and produce a pyd in build\lib.win-amd64-2.6
-- 
Robin Becker



From python at mrabarnett.plus.com  Fri Mar 12 10:47:10 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Fri, 12 Mar 2010 15:47:10 +0000
Subject: inspect.stack() and frame
In-Reply-To: <b554e528-b6d5-4ffb-bcfa-04a8712cd676@q23g2000yqd.googlegroups.com>
References: <6f3a93d6-5608-467f-a7db-d360a34fe856@i25g2000yqm.googlegroups.com>	<hnbtus$p5s$1@news.eternal-september.org>	<4988c974-c8d2-46c9-8c57-681ad22fc1bc@upsg2000gro.googlegroups.com>	<mailman.644.1268374305.23598.python-list@python.org>
	<b554e528-b6d5-4ffb-bcfa-04a8712cd676@q23g2000yqd.googlegroups.com>
Message-ID: <4B9A61FE.1080407@mrabarnett.plus.com>

F?lix-Antoine Fortin wrote:
> Thanks Gabriel, you resumed quite well what I did discovered after my
> second post
> by playing with the garbage collector module.
> 
>> (The garbage collector will,  
>> eventually, break the cycle and free those objects, but not very soon).
> 
> I'm not very familiar with the Python garbage collector, so you may
> excuse my
> simple question, but how can it break the cycle? I guess the object
> will be
> freed at least when the program ends, but could it be before that? Is
> there a
> mechanisme in the garbage collector to detect circular references?
> 
In CPython objects are reference-counted, which allows an object to be
collected as soon as there are no references to it.

However, this won't take care of circular references, so a secondary
garbage collector was introduced which occasionally looks for
inaccessible objects (garbage) using (probably) mark-and-sweep.


From gabriel.rossetti at arimaz.com  Fri Mar 12 10:50:21 2010
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Fri, 12 Mar 2010 16:50:21 +0100
Subject: Anything like "Effective Java" for Python?
In-Reply-To: <hn8d98$m0d$1@reader1.panix.com>
References: <hn8d98$m0d$1@reader1.panix.com>
Message-ID: <4B9A62BD.7080805@arimaz.com>

kj wrote:
>
> Subject line pretty much says it all: is there a book like "Effective
> Java" for Python.  I.e. a book that assumes that readers are
> experienced programmers that already know the basics of the language,
> and want to focus on more advanced programming issues?
>
> ~K
>   

Effective Java is a good book, it is not like most people responding to 
this topic a "how to program in Java"
book but a "I know how to program in Python, but I want it to run fast 
and use a minimal amount of memory".
I would have liked to have such a book for Python when I was past the 
language learning stage.

Gabriel


From mailinglists at riddergarn.dk  Fri Mar 12 10:56:12 2010
From: mailinglists at riddergarn.dk (John P.)
Date: Fri, 12 Mar 2010 15:56:12 +0000
Subject: Threading, Queue for a function so it only runs once at a time.
In-Reply-To: <6cc20cea1003120054jec2241atc2b85920a64d869c@mail.gmail.com>
References: <84d41f095f0958519ea44d749793efeb@incoming.servage.net>
	<6cc20cea1003120054jec2241atc2b85920a64d869c@mail.gmail.com>
Message-ID: <ebc0d55d6164a9aa280244645f8c6543@incoming.servage.net>

Sorry but its not really an option for me with PostgreSQL. Thanks anyway.

I wonder if there is a simple way of just queueing the run of a function
make it only run once at a time but by multiply threads? :)

On Fri, 12 Mar 2010 00:54:57 -0800, Jonathan Gardner
<jgardner at jonathangardner.net> wrote:
> For lots of transactions running at once, MySQL is a terrible choice.
> Give PostgreSQL a try. It does a much better job with that kind of
> load.
> 
> On Thu, Mar 11, 2010 at 11:11 PM, John P. <mailinglists at riddergarn.dk>
> wrote:
>> Hi,
>>
>> Im programming a simple webcrawler with threading for the fun of it,
>> which
>> is inserting the data fetch into a mysql database, but after
continuously
>> cause my mysql server to produce error during database queries (i
assume
>> its cause because of the many execution at the same time.) the scipt
>> produces errors.
>>
>> I figured out i need some kind of queue for the function i use to
insert
>> into the database, to make sure its only called once at a time.
>>
>> I have looked at the Queue module but its for more complicated than my
>> current python skills can cope with. :)
>>
>> Would somebody please help me out here?
>>


From godson.g at gmail.com  Fri Mar 12 11:13:06 2010
From: godson.g at gmail.com (Godson Gera)
Date: Fri, 12 Mar 2010 21:43:06 +0530
Subject: python module/utility equivalent to 'time' (linux) and/or 
	'ntimer'(Windows)
In-Reply-To: <01b0d61b-eb5f-44dc-862e-e31d64b3b0e9@k24g2000pro.googlegroups.com>
References: <01b0d61b-eb5f-44dc-862e-e31d64b3b0e9@k24g2000pro.googlegroups.com>
Message-ID: <f9822b401003120813m34fec84ka40452b4deae8d7a@mail.gmail.com>

Take a look at hotshot module of python
http://docs.python.org/library/hotshot.html

On Fri, Mar 12, 2010 at 7:26 PM, hiral <hiralsmaillist at gmail.com> wrote:

> Hi,
>
> Is there any python module/utility available which would report the
> time same as 'time' command in linux and/or report time same as
> 'ntimer' utility in Windows.
>
> Thank you.
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Thanks & Regards,
Godson Gera
http://godson.in
http://www.clickindia.com/detail.php?id=493636
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From billy.earney at gmail.com  Fri Mar 12 11:18:59 2010
From: billy.earney at gmail.com (Billy Earney)
Date: Fri, 12 Mar 2010 10:18:59 -0600
Subject: Visual Python programming and decompilers?
In-Reply-To: <95cccfc91003111038y6f07efb2m623122a3b8a60127@mail.gmail.com>
References: <95cccfc91003111038y6f07efb2m623122a3b8a60127@mail.gmail.com>
Message-ID: <4b9a6976.9713f30a.5a73.69a4@mx.google.com>

Ludolph,

This reminds me of the orange project which is developed in python.
http://www.ailab.si/orange/
It is actually for data mining, but many of the concepts could be used for a
more general programming structure.

Billy

-----Original Message-----
From: python-list-bounces+billy.earney=gmail.com at python.org
[mailto:python-list-bounces+billy.earney=gmail.com at python.org] On Behalf Of
Ludolph
Sent: Thursday, March 11, 2010 12:39 PM
To: python-list at python.org
Subject: Visual Python programming and decompilers?

Hi Guys

At work I have been exposed to a Agile Platform called OutSystems. It
allows you to visually program your web applications
http://i.imgur.com/r2F0i.png and I find the idea very intriguing.

So I have started to play around with the idea on how will I be able
to visually represent Python code as in the above image and then allow
the programmer to change some of the flow/code/logic visually and then
get it back as python source code. I don't know if this have been
tried before and after some googling I can't find anything like this,
so maybe I'm just lacking basic googling skills or a python solution
like the above does not exist yet.

If anybody knows of such solution please let me know, so that I don't
spend a lot of time recreating the wheel. Otherwise help me out on the
following problem:

I decided I can use byteplay3 http://pypi.python.org/pypi/byteplay/ to
disassemble the code to workable objects, It even allows me to rebuild
the objects to bytecode. So if I define patterns on how python
interrupts the source code to bytecode I can visually represent this
and also so convert my visual representations back to bytecode.

The only problem I have at the moment is how will I get this bytecode
back to python source code. I have googled for python decompiler but
only found old projects like unpyc, decompyle and some online
services. I would like to know if anybody know of a well maintained or
at least recent module that can help me accomplish the above
mentioned, because I'm hoping I can implement this in Python 3.1.

So any input or suggestion would be greatly appreciated.

Kind Regards,

-- 
Ludolph Neethling
-- 
http://mail.python.org/mailman/listinfo/python-list



From darcy at druid.net  Fri Mar 12 11:22:04 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Fri, 12 Mar 2010 11:22:04 -0500
Subject: Threading, Queue for a function so it only runs once at a time.
In-Reply-To: <ebc0d55d6164a9aa280244645f8c6543@incoming.servage.net>
References: <84d41f095f0958519ea44d749793efeb@incoming.servage.net>
	<6cc20cea1003120054jec2241atc2b85920a64d869c@mail.gmail.com>
	<ebc0d55d6164a9aa280244645f8c6543@incoming.servage.net>
Message-ID: <20100312112204.5513eebb.darcy@druid.net>

On Fri, 12 Mar 2010 15:56:12 +0000
"John P." <mailinglists at riddergarn.dk> wrote:
> Sorry but its not really an option for me with PostgreSQL. Thanks anyway.

Why?  It's your best option.  Any other solutions that you can't use
before people give you more suggestions?

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


From victorsubervi at gmail.com  Fri Mar 12 11:22:19 2010
From: victorsubervi at gmail.com (Victor Subervi)
Date: Fri, 12 Mar 2010 12:22:19 -0400
Subject: Help Troubleshooting
Message-ID: <4dc0cfea1003120822sb08f494nb56c6f9a438204ff@mail.gmail.com>

Hi;
I'm running Pexpect (no discussion list) with the following code:

#! /usr/bin/python
import pexpect

def runVpopmail(whatdo, acct, domain, newpw, oldpw=''):
  if whatdo == 'vadduser':
    child = pexpect.spawn('/home/vpopmail/bin/%s %s@%s %s' % (whatdo, acct,
domain, newpw))
  elif whatdo == 'vchangepw':
    child = pexpect.spawn('/home/vpopmail/bin/%s' % (whatdo))
    child.expect('Please enter the email address: ')
    child.sendline('%s@%s' % (acct, domain))
    child.expect('Enter old password: ')
    child.sendline(oldpw)
    child.expect('Please enter password for %s@%s: ' % (acct, domain))
    child.sendline(newpw)
    child.expect('enter password again: ')
    child.sendline(newpw)
  return child

No matter whether I try to add a user or edit a password, the fn seems to
return that everything is good, but nothing ever happens. When I place a
return of the child value and run it with whatdo==vadduser I get the
following output:

version: 2.3 ($Revision: 399 $) command: /home/vpopmail/bin/vadduser args:
['/home/vpopmail/bin/vadduser', 'test2 at globalsolutionsgroup.vi', 'qqq']
searcher: None buffer (last 100 chars): before (last 100 chars): None after:
None match: None match_index: None exitstatus: None flag_eof: False pid:
1518 child_fd: 3 closed: False timeout: 30 delimiter: pexpect.EOF logfile:
None logfile_read: None logfile_send: None maxread: 2000 ignorecase: False
searchwindowsize: None delaybeforesend: 0.05 delayafterclose: 0.1
delayafterterminate: 0.

I don't know what this means. Any ideas on how to troubleshoot this?
TIA,
beno
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From tim.wintle at teamrubber.com  Fri Mar 12 11:36:32 2010
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Fri, 12 Mar 2010 16:36:32 +0000
Subject: Visual Python programming and decompilers?
In-Reply-To: <95cccfc91003111038y6f07efb2m623122a3b8a60127@mail.gmail.com>
References: <95cccfc91003111038y6f07efb2m623122a3b8a60127@mail.gmail.com>
Message-ID: <1268411792.6354.2.camel@localhost>

On Thu, 2010-03-11 at 20:38 +0200, Ludolph wrote:
> 
> I decided I can use byteplay3 http://pypi.python.org/pypi/byteplay/ to
> disassemble the code to workable objects, It even allows me to rebuild
> the objects to bytecode. So if I define patterns on how python
> interrupts the source code to bytecode I can visually represent this
> and also so convert my visual representations back to bytecode.

Assuming you're on 2.6 or later, I'd suggest working with the ast module
instead:
http://docs.python.org/library/ast.html





From solipsis at pitrou.net  Fri Mar 12 11:48:33 2010
From: solipsis at pitrou.net (Antoine Pitrou)
Date: Fri, 12 Mar 2010 16:48:33 +0000 (UTC)
Subject: Asynchronous HTTP client
References: <b212d954-6eb0-43d3-80ac-6cd854a1a560@b36g2000pri.googlegroups.com>
	<20100307131604.2792.1008062813.divmod.xquotient.1336@localhost.localdomain>
	<30c3a3701003070640y19772987s50b583aa54e535d5@mail.gmail.com>
Message-ID: <hndr90$po8$1@dough.gmane.org>

Le Sun, 07 Mar 2010 22:40:36 +0800, pingooo a ?crit?:
> I'm writing an open source python client for a web service. The client
> may be used in all kinds of environments - Linux, Mac OS X, Windows, web
> hosting, etc by others. It is not impossible to have twisted as a
> dependency, but that makes deployment a larger job than simply uploading
> a Python file.

If it can be used by non-Python users, you will have to package it using 
py2exe or py2app anyway, in which case Twisted will be bundled 
automatically and the size overhead won't be very large.




From mailinglists at riddergarn.dk  Fri Mar 12 11:49:04 2010
From: mailinglists at riddergarn.dk (John P.)
Date: Fri, 12 Mar 2010 16:49:04 +0000
Subject: Threading, Queue for a function so it only runs once at a time.
In-Reply-To: <20100312112204.5513eebb.darcy@druid.net>
References: <84d41f095f0958519ea44d749793efeb@incoming.servage.net>
	<6cc20cea1003120054jec2241atc2b85920a64d869c@mail.gmail.com>
	<ebc0d55d6164a9aa280244645f8c6543@incoming.servage.net>
	<20100312112204.5513eebb.darcy@druid.net>
Message-ID: <1a57cdb3bd2bdf55176e96369d25d1b7@incoming.servage.net>

On Fri, 12 Mar 2010 11:22:04 -0500, "D'Arcy J.M. Cain" <darcy at druid.net>
wrote:
> On Fri, 12 Mar 2010 15:56:12 +0000
> "John P." <mailinglists at riddergarn.dk> wrote:
>> Sorry but its not really an option for me with PostgreSQL. Thanks
anyway.
> 
> Why?  It's your best option.  Any other solutions that you can't use
> before people give you more suggestions?

Chill. I didn't ask for an alternative to my database, it could be writing
in a file as well. What I need is some kind of queue to my function so it
doesnt crack up running 20 times at the same time. I'm working on a remote
server which I share with some friends, meaning I can't install whatever I
want to. 
The problem seems to be that my threads are making MySQL queries at the
same time before it can fetch the data just requested. Also I said thanks
for his effort trying to help and kept a nice tone, shouldn't that be
enough? 

/John


From solipsis at pitrou.net  Fri Mar 12 11:57:37 2010
From: solipsis at pitrou.net (Antoine Pitrou)
Date: Fri, 12 Mar 2010 16:57:37 +0000 (UTC)
Subject: file seek is slow
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>
Message-ID: <hndrq1$po8$2@dough.gmane.org>

Le Tue, 09 Mar 2010 15:56:47 -0800, Metalone a ?crit?:
>     for i in xrange(1000000):
>        f1.seek(0)

This is quite a stupid benchmark to write, since repeatedly seeking to 0 
is a no-op. I haven't re-read the file object code recently, but chances 
are that the Python file object has its own bookkeeping which adds a bit 
of execution time.

But I would suggest measuring the performance of *actual* seeks to 
different file offsets, before handwaving about the supposed "slowness" 
of file seeks in Python.

Regards

Antoine.



From mailinglists at riddergarn.dk  Fri Mar 12 12:25:13 2010
From: mailinglists at riddergarn.dk (John P.)
Date: Fri, 12 Mar 2010 17:25:13 +0000
Subject: Threading, Queue for a function so it only runs once at a time.
In-Reply-To: <1a57cdb3bd2bdf55176e96369d25d1b7@incoming.servage.net>
References: <84d41f095f0958519ea44d749793efeb@incoming.servage.net>
	<6cc20cea1003120054jec2241atc2b85920a64d869c@mail.gmail.com>
	<ebc0d55d6164a9aa280244645f8c6543@incoming.servage.net>
	<20100312112204.5513eebb.darcy@druid.net>
	<1a57cdb3bd2bdf55176e96369d25d1b7@incoming.servage.net>
Message-ID: <7242f69346c1ddb6803a50449fe36973@incoming.servage.net>

On Fri, 12 Mar 2010 16:49:04 +0000, "John P." <mailinglists at riddergarn.dk>
wrote:
> On Fri, 12 Mar 2010 11:22:04 -0500, "D'Arcy J.M. Cain" <darcy at druid.net>
> wrote:
>> On Fri, 12 Mar 2010 15:56:12 +0000
>> "John P." <mailinglists at riddergarn.dk> wrote:
>>> Sorry but its not really an option for me with PostgreSQL. Thanks
> anyway.
>> 
>> Why?  It's your best option.  Any other solutions that you can't use
>> before people give you more suggestions?
> 
> Chill. I didn't ask for an alternative to my database, it could be
writing
> in a file as well. What I need is some kind of queue to my function so
it
> doesnt crack up running 20 times at the same time. I'm working on a
remote
> server which I share with some friends, meaning I can't install whatever
I
> want to. 
> The problem seems to be that my threads are making MySQL queries at the
> same time before it can fetch the data just requested. Also I said
thanks
> for his effort trying to help and kept a nice tone, shouldn't that be
> enough? 
> 
> /John

Don't worry guys, I found a solution. My problem was caused because I used
the same mysql connection for all the treads, now its working perfectly,
with mysql. 

/John.


From cmpython at gmail.com  Fri Mar 12 13:31:50 2010
From: cmpython at gmail.com (CM)
Date: Fri, 12 Mar 2010 10:31:50 -0800 (PST)
Subject: Need advice on starting a Python group
References: <hnb0d1$2el$1@reader1.panix.com>
Message-ID: <ba83f1cf-9b25-4104-990b-daa3604d80b4@c16g2000yqd.googlegroups.com>

On Mar 11, 9:57?am, gb345 <gb... at invalid.com> wrote:
> I'm hoping to get advice from anyone with prior experience setting
> up a Python group.
>
> A friend of mine and I have been trying to start a
> scientific-programming-oriented Python group in our school (of
> medecine and bio research), with not much success.
>
> The main problem is attendance. ?Even though a *ton* of people have
> told us that it's a great idea, that they're *very* interested,
> and have asked to be added to our mailing list, the attendance to
> our first few meeting has never been more than 5, including my
> friend and I. ?Last time just he and I showed up.
>
> The second problem is getting content. ?The format we'd envisioned
> for this group was centered around code review (though not limited
> to it). ?The idea was that at every meeting a different member
> would show some code. ?This could be for any of a number of reasons,
> such as, for example, 1) illustrate a cool module or technique; 2)
> present a scientific research problem and how they used Python to
> solve it, or get help solving it; 3) get general feedback (e.g. on
> code clarity, software usability, module architecture, etc.). ?But
> in principle just about anything is OK: e.g. a talk on favorite
> Python resources, or a comparison of Python with some other language,
> or an overview of Python gotchas would all be fair game.
>
> Also, we stressed that the talks were not expected to be polished:
> no need for PowerPoint slides, etc. ?Just project any old code onto
> the screen, and talk about it, or scribble stuff on the chalkboard.
>
> Still, we have a hard time finding volunteers.
>
> And even when we've had volunteers, hardly anyone shows up!

Do you advertise each time and describe what the topic will be for
that meeting and why the attendees should care?  That might make a
difference.  I.e., there's a big difference between:

a) The Thursday afternoon Python for scientific applications is
meeting, and I should remember that this week amidst all the other
stuff I have going on.

and

b) Wow, this Thursday there will be an hour workshop on how to create
publication quality graphs (somewhat) easily in Python using ready-
made tools...and there will be pizza!

Also, giving it a cool acronymic name doesn't hurt.  :D

Che


From ugocupcic at gmail.com  Fri Mar 12 13:56:00 2010
From: ugocupcic at gmail.com (Ugo Cupcic)
Date: Fri, 12 Mar 2010 18:56:00 +0000
Subject: question regarding wxSlider
Message-ID: <df20a30d1003121056t66be663ds127aba6b9e679675@mail.gmail.com>

Hi all,

I have a question regarding wxSlider. I'm developing a wxwidget python
interface for a robotic hand. The sliders send the target values to the
joints.

I'd like to display the current position of the joint on the slider. I
wanted to use wxSlider.SetTick(myposition) but I couldn't get SetTick to
display anything.

Anyone has an idea ? I attached a dummy code to the message to illustrate.

Cheers,

Ugo

-- 
              Ugo Cupcic
http://www.genugo.com/ugocupcic
   _
  ' v '
/      \
 m m
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From agoretoy at gmail.com  Fri Mar 12 13:57:47 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Fri, 12 Mar 2010 12:57:47 -0600
Subject: execute bash builtins in python
In-Reply-To: <hnder4$bvg$1@dough.gmane.org>
References: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com> 
	<hnder4$bvg$1@dough.gmane.org>
Message-ID: <c9d33c541003121057l703689cxf886c4bdbdec4742@mail.gmail.com>

Steve thank you. The problem is that you can only run commands from Popen or
os.system and stuff. You cant run bash shell builtin commands for some
reason.

I was able to get this to work. What I did is call this:

Popen(["bash -c 'source
$HOME/.bashrc;alias'"],shell=True,stdout=PIPE).stdout.read()

and make sure you don't have a line like this in your .bashrc:
[ -z "$PS1" ] && return

Another approach I came up with was to set aliases and functions as a
environment variable and access them with os.environ.

this is how I'm doing it.

export ALIASES=`alias|awk '{print $2}'|cut -d = -f 1|xargs`
export FUNCTIONS=`declare -F|awk '{print $3}'|xargs`

use this at the end or the .bashrc and then you can access defined aliases
and functions inside python with environ

-Alex Goretoy
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From philip at semanchuk.com  Fri Mar 12 14:08:19 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Fri, 12 Mar 2010 14:08:19 -0500
Subject: question regarding wxSlider
In-Reply-To: <df20a30d1003121056t66be663ds127aba6b9e679675@mail.gmail.com>
References: <df20a30d1003121056t66be663ds127aba6b9e679675@mail.gmail.com>
Message-ID: <8EA74011-1EA0-42CB-BAF5-F9A9F1FF2D16@semanchuk.com>

On Mar 12, 2010, at 1:56 PM, Ugo Cupcic wrote:

> Hi all,
>
> I have a question regarding wxSlider. I'm developing a wxwidget python
> interface for a robotic hand. The sliders send the target values to  
> the
> joints.
>
> I'd like to display the current position of the joint on the slider. I
> wanted to use wxSlider.SetTick(myposition) but I couldn't get  
> SetTick to
> display anything.
>
> Anyone has an idea ? I attached a dummy code to the message to  
> illustrate.


Hi Ugo,
I don't mean to chase you away, but there is a dedicated wxPython  
mailing list where you obviously have a much better chance of getting  
an answer.

http://www.wxpython.org/maillist.php

Developing a robotic hand sounds like fun!

Cheers
Philip






From kwmsmith at gmail.com  Fri Mar 12 14:16:14 2010
From: kwmsmith at gmail.com (Kurt Smith)
Date: Fri, 12 Mar 2010 13:16:14 -0600
Subject: Need advice on starting a Python group
In-Reply-To: <hnb0d1$2el$1@reader1.panix.com>
References: <hnb0d1$2el$1@reader1.panix.com>
Message-ID: <c266a7931003121116p29f7bdc1h30b7db4adb419a31@mail.gmail.com>

On Thu, Mar 11, 2010 at 8:57 AM, gb345 <gb345 at invalid.com> wrote:
>
>
>
> I'm hoping to get advice from anyone with prior experience setting
> up a Python group.
>
> A friend of mine and I have been trying to start a
> scientific-programming-oriented Python group in our school (of
> medecine and bio research), with not much success.
>
> The main problem is attendance. ?Even though a *ton* of people have
> told us that it's a great idea, that they're *very* interested,
> and have asked to be added to our mailing list, the attendance to
> our first few meeting has never been more than 5, including my
> friend and I. ?Last time just he and I showed up.
>
> The second problem is getting content. ?The format we'd envisioned
> for this group was centered around code review (though not limited
> to it). ?The idea was that at every meeting a different member
> would show some code. ?This could be for any of a number of reasons,
> such as, for example, 1) illustrate a cool module or technique; 2)
> present a scientific research problem and how they used Python to
> solve it, or get help solving it; 3) get general feedback (e.g. on
> code clarity, software usability, module architecture, etc.). ?But
> in principle just about anything is OK: e.g. a talk on favorite
> Python resources, or a comparison of Python with some other language,
> or an overview of Python gotchas would all be fair game.
>
> Also, we stressed that the talks were not expected to be polished:
> no need for PowerPoint slides, etc. ?Just project any old code onto
> the screen, and talk about it, or scribble stuff on the chalkboard.
>
> Still, we have a hard time finding volunteers.
>
> And even when we've had volunteers, hardly anyone shows up!
>
> Any suggestions would be appreciated.
>
> GB
>
> P.S. ?There's a Python Meetup we could go to, but it does not fit
> the bill for us: it doesn't meet often enough, it's sort of out of
> the way, and has practically no one doing scientific programming.
> --
> http://mail.python.org/mailman/listinfo/python-list
>

There's a general Scientific Computing interest group that gets
together here at the University of Wisconsin-Madison, and it has a
significant Python component & focus.  They put on a Python bootcamp
this January that was a huge success.

http://hackerwithin.org/cgi-bin/hackerwithin.fcgi/wiki

They have bi-weekly meetings, sometimes it's of the 'come and share on
X topic,' although many times its 'local guest speaker is coming to
speak about Y'.  My impression is that the latter meetings grabbed a
number of people around campus -- 'hey, I need to do Y, I'll see what
the speaker has to say,' and then they started coming for the
show-and-tell meetings.  My recommendation would be to provide
something of value every meeting, the more specific the better.
'Python' in this regard is a bit open ended.  You'd likely get more
involvement if you had meetings that focused on, e.g., parallel
computing (and have examples in python (mpi4py), and have someone come
and talk about MPI or something), or scientific data formats (with
examples of pyhdf5 or pytables...), or you could advertise a tutorial
on some scipy & numpy features and their advantages over using
matlab/octave/idl.

It's more work than show-and-tell meetings, but look at it as priming the pump.

There is much interest around here re: Python in science, but many
have only heard about it, some have dabbled but put it on the shelf,
others couldn't get it to work (they're scientists and used to
prepackaged software that works out of the box -- if it doesn't, it's
somebody else's problem), many others can't justify the time it would
take to learn it when they already have something else working.  Until
something with value comes along (like your meeting with specific
topics) to change their minds, an open-ended meeting won't appeal much
to them.

Just some thoughts, and an example of what's worked here.  Personally
I tend to make it to the meetings with a specific topic, and end up
skipping the ones that are more open-ended.

Kurt


From gdamjan at gmail.com  Fri Mar 12 14:20:48 2010
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Fri, 12 Mar 2010 20:20:48 +0100
Subject: Python for newbies (Pythno users group in Macedonia)
Message-ID: <hpgq67-gai.ln1@archaeopteryx.softver.org.mk>

Hi all,
we are starting with bi-monthly Python User Group meetings in Skopje, 
Macedonia. The meetings are targeted for both beginners and more 
experienced users.

The basic idea is to have an 1 hour presentation at the start for the 
beginners and an 1 hour ad-hoc discussion about projects, applications, 
interesting stuff etc.

I'd like to gather some guidance/experince/thoughts about some beginner 
oriented python lectures we could use?

My first idea was to do something like the "Python module of the Week", 
but maybe there's a better approach?

thanks

-- 
damjan


From no.email at nospam.invalid  Fri Mar 12 14:23:10 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Fri, 12 Mar 2010 11:23:10 -0800
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<mailman.256.1267655008.23598.python-list@python.org>
	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
	<6cc20cea1003120105j626cc519o2271106e088b2e90@mail.gmail.com>
	<mailman.664.1268404115.23598.python-list@python.org>
Message-ID: <7xljdx73a9.fsf@ruckus.brouhaha.com>

"D'Arcy J.M. Cain" <darcy at druid.net> writes:
> Just curious, what database were you using that wouldn't keep up with
> you?  I use PostgreSQL and would never consider going back to flat
> files.  

Try making a file with a billion or so names and addresses, then
compare the speed of inserting that many rows into a postgres table
against the speed of copying the file.

> The only thing I can think of that might make flat files faster is
> that flat files are buffered whereas PG guarantees that your
> information is written to disk before returning 

Don't forget all the shadow page operations and the index operations,
and that a lot of these operations require reading as well as writing
remote parts of the disk, so buffering doesn't help avoid every disk
seek.

Generally when faced with this sort of problem I find it worthwhile to
ask myself whether the mainframe programmers of the 1960's-70's had to
deal with the same thing, e.g. when sending out millions of phone bills,
or processing credit card transactions (TPF), then ask myself how they
did it.  Their computers had very little memory or disk space by today's
standards, so their main bulk storage medium was mag tape.  A heck of a
lot of these data processing problems can be recast in terms of sorting
large files on tape, rather than updating database one record at a time
on disk or in memory.  And that is still what (e.g.) large search
clusters spend a lot of their time doing (look up the term "pennysort"
for more info).


From martin at v.loewis.de  Fri Mar 12 14:29:40 2010
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Fri, 12 Mar 2010 20:29:40 +0100
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
In-Reply-To: <4B9A614C.1080105@chamonix.reportlab.co.uk>
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>	<mailman.619.1268324988.23598.python-list@python.org>	<4B992FB5.8090207@v.loewis.de>
	<4B9A2810.9030602@chamonix.reportlab.co.uk>
	<4B9A614C.1080105@chamonix.reportlab.co.uk>
Message-ID: <4B9A9624.7040200@v.loewis.de>

> Not sure if this is a bug

I think it is. It seems that the cross-build support in msvc9compiler
has been tested only in a build tree of Python (where there is no Libs
directory).

For released copies of Python, I could change that to distribute the
AMD64 pythonXY.lib in libs/amd64. [FWIW, I'm still puzzled why I ship
the import libraries of all the pyd files as well - I can't see a reason
other than tradition]. Then, distutils should change to look it up there.

Regards,
Martin


From jcb at iteris.com  Fri Mar 12 14:53:28 2010
From: jcb at iteris.com (Metalone)
Date: Fri, 12 Mar 2010 11:53:28 -0800 (PST)
Subject: file seek is slow
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>
	<mailman.680.1268413073.23598.python-list@python.org>
Message-ID: <d9f78dc8-d51b-4e1b-a89c-1f170f3b9718@z1g2000prc.googlegroups.com>

I almost wrote a long reply to all this.
In the end it boils down to being concerned about how much overhead
there is to calling a 'C' function.
I assumed that file.seek() simply delegated to fseek() and thus was
one way to test this overhead.
However, I now think that it must be doing more and may not be a
reasonable comparison.

I have used the profiler about as much as I can to find where my
program is slow, and it appears to me that
the overhead to calling 'C' functions is now my biggest problem.
I have been using Ctypes, which has been a great tool so far.
I just discovered Cython and this looks like it may help me.
I had not heard of pythoid, so I will check it out.

I did not mean to offend anybody in Cython community.
It just seemed funny to me that 21 lines of Python became 1478 lines
of 'C'.
I wasn't really expecting any response to this.
I don't know enough about this to really assume anything.

Stephan,
I just tested 1e7 loops.
'C': 8.133 seconds
Cython: 10.812 seconds

I can't figure out what Cython is using for CFLAGS, so this could be
important.

I used While instead of xrange, because I thought it would be faster
in Cython.
They had roughly the same execution speed.

Thanks all for the suggestions.
I think I will just consider this thread closed.




From john at castleamber.com  Fri Mar 12 15:36:35 2010
From: john at castleamber.com (John Bokma)
Date: Fri, 12 Mar 2010 14:36:35 -0600
Subject: Anything like "Effective Java" for Python?
References: <hn8d98$m0d$1@reader1.panix.com>
	<mailman.672.1268409423.23598.python-list@python.org>
Message-ID: <87k4thp99o.fsf@castleamber.com>

Gabriel Rossetti <gabriel.rossetti at arimaz.com> writes:

> kj wrote:
>>
>> Subject line pretty much says it all: is there a book like "Effective
>> Java" for Python.  I.e. a book that assumes that readers are
>> experienced programmers that already know the basics of the language,
>> and want to focus on more advanced programming issues?
>
> Effective Java is a good book, it is not like most people responding
> to this topic a "how to program in Java"

I had more the feeling that these responses were more of the "Look, you
actually need a book to learn how to program effectively in Java
*snigger*" fanboism.

> book but a "I know how to program in Python, but I want it to run fast
> and use a minimal amount of memory".
> I would have liked to have such a book for Python when I was past the
> language learning stage.

High Performance Python by Anthony Lewis (Author), et al. (*snigger*!)

might be such a book but we have to wait a few more months:
Publisher: O'Reilly Media; 1 edition (September 15, 2010)
(It has been on my wish list for several months)

To the OP: right now, Dive into Python is clearly written with people
who have experience with programming in mind. I've both the Python 2 and
Python 3 version (books). You can download a version of each for free:

http://www.google.com/search?q=dive%20into%20python

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From martin at v.loewis.de  Fri Mar 12 15:56:42 2010
From: martin at v.loewis.de (Martin v. Loewis)
Date: Fri, 12 Mar 2010 21:56:42 +0100
Subject: Unicode characters in btye-strings
In-Reply-To: <mailman.667.1268408282.23598.python-list@python.org>
References: <4b9a352d$0$27822$c3e8da3@news.astraweb.com>
	<mailman.667.1268408282.23598.python-list@python.org>
Message-ID: <hne9qa$ehf$1@online.de>

>> Can somebody explain what happens when I put non-ASCII characters into a
>> non-unicode string? My guess is that the result will depend on the
>> current encoding of my terminal.
> 
> Exactly right.

To elaborate on the "what happens" part: the string that gets entered is
typically passed as a byte sequence, from the terminal (application) to
the OS kernel, from the OS kernel to Python's stdin, and from there to
the parser. Python recognizes the string delimiters, but (practically)
leaves the bytes between the delimiters as-is (*), creating a byte
string object with the very same bytes.

The more interesting question is what happens when you do

py> s = u"???"

Here, Python needs to decode the bytes, according to some encoding.
Usually, it would want to use the source encoding (as given through
-*- Emacs -*- markers), but there are none. Various Python versions then
try different things; what they should do is to determine the terminal
encoding, and decode the bytes according to that one.

Regards,
Martin

(*) If a source encoding was given, the source is actually recoded to
UTF-8, parsed, and then re-encoded back into the original encoding.


From spamfresser at ch3ka.de  Fri Mar 12 17:55:49 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Fri, 12 Mar 2010 23:55:49 +0100
Subject: Unicode characters in btye-strings
In-Reply-To: <hne9qa$ehf$1@online.de>
References: <4b9a352d$0$27822$c3e8da3@news.astraweb.com>
	<mailman.667.1268408282.23598.python-list@python.org>
	<hne9qa$ehf$1@online.de>
Message-ID: <hnegpr$qam$1@news.urz.uni-heidelberg.de>

Am 12.03.2010 21:56, schrieb Martin v. Loewis:
> (*) If a source encoding was given, the source is actually recoded to
> UTF-8, parsed, and then re-encoded back into the original encoding.

Why is that? So "unicode"-strings (as in u"string") are not really 
unicode-, but utf8-strings?

Need citation plz.

Thx,
Michael


From torriem at gmail.com  Fri Mar 12 18:15:55 2010
From: torriem at gmail.com (Michael Torrie)
Date: Fri, 12 Mar 2010 16:15:55 -0700
Subject: converting datetime with tzinfo to unix timestamp
Message-ID: <4B9ACB2B.3090203@gmail.com>

On Python 2.5 here.

I've searched and searched but I can't find any way to convert a
datetime object that includes a timezone (tzinfo) to a unix timestamp.
Folks on the net say to simply use the timetuple() method of the object
and feed that to time.mktime().  But that just doesn't seem to work for
me.  At least if my understanding that the unix timestamp is always UTC.

I'm using the pytz module to create a datetime object of a certain
timezone.  For example:


import pytz
import datetime
import time

mountain = pytz.timezone("US/Mountain") # MST or MDT depending on date
eastern = pytz.timezone("US/Eastern")   # EST or EDT depending on date

date1 = mountain.localize(datetime.datetime(2010, 3, 12, 9, 0))
date2 = eastern.localize(datetime.datetime(2010, 3, 12, 9, 0))

Now if I examine the two objects, I get:
>>> print date1
2010-03-12 09:00:00-07:00

>>> print date2
2010-03-12 09:00:00-05:00

However the standard time.mktime(date2.timetuple()) thing gives me a
timestamp, but it's in my local timezone and gives me the same answer
for both dates!

Can anyone point me in the right direction?

thanks.


From mmanns at gmx.net  Fri Mar 12 18:24:49 2010
From: mmanns at gmx.net (Martin Manns)
Date: Sat, 13 Mar 2010 00:24:49 +0100
Subject: [ANN] Pyspread 0.0.14b released
Message-ID: <mailman.713.1268503217.23598.python-announce-list@python.org>

Pyspread 0.0.14b released
=========================

I am pleased to announce the new release 0.0.14b of pyspread.

 
About: 
------

Pyspread is a cross-platform Python spreadsheet application. 
It is based on and written in the programming language Python.

Instead of spreadsheet formulas, Python expressions are entered into
the spreadsheet cells. Each expression returns a Python object that can
be accessed from other cells. These objects can represent anything
including lists or matrices.

Pyspread runs on Linux and *nix platforms with GTK support as well as
on Windows (XP and Vista tested). On Mac OS X, some icons are too small
but the application basically works.


Homepage
--------

http://pyspread.sourceforge.net


New features
------------

 * Cell border can be changed independently.
 * Cell access allows negative indices when not slicing.


Enjoy

Martin



From john at castleamber.com  Fri Mar 12 18:37:54 2010
From: john at castleamber.com (John Bokma)
Date: Fri, 12 Mar 2010 17:37:54 -0600
Subject: Unicode characters in btye-strings
References: <4b9a352d$0$27822$c3e8da3@news.astraweb.com>
	<mailman.667.1268408282.23598.python-list@python.org>
	<hne9qa$ehf$1@online.de> <hnegpr$qam$1@news.urz.uni-heidelberg.de>
Message-ID: <87r5npnmb1.fsf@castleamber.com>

Michael Rudolf <spamfresser at ch3ka.de> writes:

> Am 12.03.2010 21:56, schrieb Martin v. Loewis:
>> (*) If a source encoding was given, the source is actually recoded to
>> UTF-8, parsed, and then re-encoded back into the original encoding.
>
> Why is that? So "unicode"-strings (as in u"string") are not really
> unicode-, but utf8-strings?

utf8 is a Unicode *encoding*.

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From martin at v.loewis.de  Fri Mar 12 18:51:42 2010
From: martin at v.loewis.de (Martin v. Loewis)
Date: Sat, 13 Mar 2010 00:51:42 +0100
Subject: Unicode characters in btye-strings
In-Reply-To: <hnegpr$qam$1@news.urz.uni-heidelberg.de>
References: <4b9a352d$0$27822$c3e8da3@news.astraweb.com>
	<mailman.667.1268408282.23598.python-list@python.org>
	<hne9qa$ehf$1@online.de> <hnegpr$qam$1@news.urz.uni-heidelberg.de>
Message-ID: <4B9AD38E.5030402@v.loewis.de>

Michael Rudolf wrote:
> Am 12.03.2010 21:56, schrieb Martin v. Loewis:
>> (*) If a source encoding was given, the source is actually recoded to
>> UTF-8, parsed, and then re-encoded back into the original encoding.
> 
> Why is that?

Why is what? That string literals get reencoded into the source encoding?

> So "unicode"-strings (as in u"string") are not really 
> unicode-, but utf8-strings?

No. String literals, in 2.x, are not written with u"", and are stored in
the source encoding. Above procedure applies to regular strings (see
where the "*" goes in my original article).

> Need citation plz.

You really want a link to the source code implementing that?

Regards,
Martin


From morecrown at gmail.com  Fri Mar 12 19:29:33 2010
From: morecrown at gmail.com (Hephzibah)
Date: Fri, 12 Mar 2010 16:29:33 -0800 (PST)
Subject: POS Tagging
Message-ID: <1610f59e-b49f-4c5b-ade7-915c92c32b79@q21g2000yqm.googlegroups.com>

I just started working on POS tagging with these codes:

import nltk
text = nltk.word_tokenize("And now for something completely
different")
#print text
print nltk.pos_tag(text)

Python prompted me to download a resource with these codes:

Resource 'taggers/maxent_treebank_pos_tagger/english.pickle' not
found.  Please use the NLTK Downloader to obtain the resource:

I download the resources available using nltk.download(). But  I
couldn't run POS tagger. Python gave my the following message:

Traceback (most recent call last):
  File "C:/Python25/tag practices.py", line 5, in <module>
    print nltk.pos_tag(text)
  File "C:\Python25\lib\site-packages\nltk\tag\__init__.py", line 62,
in pos_tag
    tagger = nltk.data.load(_POS_TAGGER)
  File "C:\Python25\lib\site-packages\nltk\data.py", line 492, in load
    resource_val = pickle.load(_open(resource_url))
  File "C:\Python25\lib\site-packages\nltk\classify\maxent.py", line
57, in <module>
    import numpy
ImportError: No module named numpy

Can someone pls. tell me what I'm supposed to do next?

Thanks,
Hephzibah


From john at castleamber.com  Fri Mar 12 19:33:55 2010
From: john at castleamber.com (John Bokma)
Date: Fri, 12 Mar 2010 18:33:55 -0600
Subject: POS Tagging
References: <1610f59e-b49f-4c5b-ade7-915c92c32b79@q21g2000yqm.googlegroups.com>
Message-ID: <87aaudnjpo.fsf@castleamber.com>

Hephzibah <morecrown at gmail.com> writes:

> ImportError: No module named numpy
>
> Can someone pls. tell me what I'm supposed to do next?

Install numpy would be my first guess.

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From alex.kapps at web.de  Fri Mar 12 19:44:49 2010
From: alex.kapps at web.de (Alexander Kapps)
Date: Sat, 13 Mar 2010 01:44:49 +0100
Subject: Python eCommerce, small webshop
Message-ID: <4B9AE001.3050406@web.de>

Hello everybody!

I have to set up a small webshop for used books, CDs, DVD, and stuff 
  and did't find anything realy usefull on google.

I'm pretty skilled with Python and would strongly prefer a Python 
based Shop but all I've found are in early stage, unmaintained or 
too limited.

I've looked around and found many PHP based shops (currently I'm 
playing with OpenCart but their code is so messy, I don't think this 
is going to work) and some Ruby based ones (I don't know Ruby at all)

I there really no decent, up-to-date, activily maintained and post 
beta stage Python webshop?

What I need is:

- full german support (ie. translation, shipping models, payment 
models, etc)
- secure (code, SQL, full SSL, etc)
- themable without getting into all gory details of modern HTML/CSS 
(a bit is OK)
- customizable by people with good Python and basic SQL knowledge
- finally (after being setup) usable by people without any 
programming skills at all.



Thanks for any tips.

Regards
Alex


From alex.kapps at web.de  Fri Mar 12 20:02:36 2010
From: alex.kapps at web.de (Alexander Kapps)
Date: Sat, 13 Mar 2010 02:02:36 +0100
Subject: Python eCommerce, small webshop
Message-ID: <4B9AE42C.1060905@web.de>

Hello everybody!

I have to set up a small webshop for used books, CDs, DVD, and stuff 
  and did't find anything realy usefull on google.

I'm pretty skilled with Python and would strongly prefer a Python 
based Shop but all I've found are in early stage, unmaintained or 
too limited.

I've looked around and found many PHP based shops (currently I'm 
playing with OpenCart but their code is so messy, I don't think this 
is going to work) and some Ruby based ones (I don't know Ruby at all)

I there really no decent, up-to-date, activily maintained and post 
beta stage Python webshop?

What I need is:

- full german support (ie. translation, shipping models, payment 
models, etc)
- secure (code, SQL, full SSL, etc)
- themable without getting into all gory details of modern HTML/CSS 
(a bit is OK)
- customizable by people with good Python and basic SQL knowledge
- finally (after being setup) usable by people without any 
programming skills at all.



Thanks for any tips.

Regards
Alex


From emile at fenx.com  Fri Mar 12 20:11:04 2010
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 12 Mar 2010 17:11:04 -0800
Subject: Python eCommerce, small webshop
In-Reply-To: <4B9AE42C.1060905@web.de>
References: <4B9AE42C.1060905@web.de>
Message-ID: <hneojs$d4l$1@dough.gmane.org>

On 3/12/2010 5:02 PM Alexander Kapps said...
> Hello everybody!
>
> I have to set up a small webshop for used books, CDs, DVD, and stuff and
> did't find anything realy usefull on google.

Have you checked the current status of Satchmo?

Emile


>
> I'm pretty skilled with Python and would strongly prefer a Python based
> Shop but all I've found are in early stage, unmaintained or too limited.
>
> I've looked around and found many PHP based shops (currently I'm playing
> with OpenCart but their code is so messy, I don't think this is going to
> work) and some Ruby based ones (I don't know Ruby at all)
>
> I there really no decent, up-to-date, activily maintained and post beta
> stage Python webshop?
>
> What I need is:
>
> - full german support (ie. translation, shipping models, payment models,
> etc)
> - secure (code, SQL, full SSL, etc)
> - themable without getting into all gory details of modern HTML/CSS (a
> bit is OK)
> - customizable by people with good Python and basic SQL knowledge
> - finally (after being setup) usable by people without any programming
> skills at all.
>
>
>
> Thanks for any tips.
>
> Regards
> Alex




From alex.kapps at web.de  Fri Mar 12 20:38:55 2010
From: alex.kapps at web.de (Alexander Kapps)
Date: Sat, 13 Mar 2010 02:38:55 +0100
Subject: Python eCommerce, small webshop
In-Reply-To: <4B9AEB04.3010403@web.de>
References: <4B9AE42C.1060905@web.de> <hneojs$d4l$1@dough.gmane.org>
	<4B9AEB04.3010403@web.de>
Message-ID: <4B9AECAF.10709@web.de>

Sorry, Emile for the private post, one beer too much and the wrong 
button... ;-)

Emile van Sebille wrote:

 > On 3/12/2010 5:02 PM Alexander Kapps said...
 >> Hello everybody!
 >>
 >> I have to set up a small webshop for used books, CDs, DVD, and 
stuff and
 >> did't find anything realy usefull on google.
 >
 > Have you checked the current status of Satchmo?

Sort of. I checked their site and feature list which looks 
promising. Then I searched for a forum. I have quite some objections 
  against projects who only have a google group with a reaction time 
measured in days.

But since you mentioned it, I'll have a closer look.

Thank you.


From steve at REMOVE-THIS-cybersource.com.au  Fri Mar 12 22:06:52 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 13 Mar 2010 03:06:52 GMT
Subject: StringChain -- a data structure for managing large sequences of 
	chunks of bytes
References: <mailman.646.1268377905.23598.python-list@python.org>
	<4b9a00ce$0$27822$c3e8da3@news.astraweb.com>
	<mailman.661.1268401226.23598.python-list@python.org>
Message-ID: <4b9b014c$0$27822$c3e8da3@news.astraweb.com>

On Fri, 12 Mar 2010 13:40:23 +0000, MRAB wrote:

>> To be taken seriously, I think you need to compare stringchain to the
>> list idiom. If your benchmarks favourably compare to that, then it
>> might be worthwhile.
>> 
> IIRC, someone did some work on making concatenation faster by delaying
> it until a certain threshold had been reached (in the string class
> implementation).

I believe you're talking about this patch:

http://bugs.python.org/issue1569040

It's never been formally rejected, but the chances of it being accepted 
are pretty low.


However, in Python 2.4 another optimization was added that makes string 
concatenation of the form:

a = a + b
a += b

much faster. This is implementation specific (Jython and IronPython don't 
have it, and almost certainly won't) and it doesn't work for (e.g.):

a = b + a

See here: 

http://mail.python.org/pipermail/python-dev/2004-August/046686.html
http://bugs.python.org/issue980695



-- 
Steven


From robin1 at cnsp.com  Fri Mar 12 22:26:20 2010
From: robin1 at cnsp.com (Robin)
Date: Fri, 12 Mar 2010 19:26:20 -0800 (PST)
Subject: python to exe
Message-ID: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>

Does anyone know of a good python to stand alone exe compiler?

Thanks,
-Robin


From gagsl-py2 at yahoo.com.ar  Fri Mar 12 23:11:47 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 12 Mar 2010 20:11:47 -0800 (PST)
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
Message-ID: <b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>

On 13 mar, 00:26, Robin <rob... at cnsp.com> wrote:

> Does anyone know of a good python to stand alone exe compiler?

http://tinyurl.com/yfcfzz4



From clp2 at rebertia.com  Fri Mar 12 23:12:19 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 12 Mar 2010 20:12:19 -0800
Subject: python to exe
In-Reply-To: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
Message-ID: <50697b2c1003122012q3c2530bt79666118bc639b87@mail.gmail.com>

On Fri, Mar 12, 2010 at 7:26 PM, Robin <robin1 at cnsp.com> wrote:
> Does anyone know of a good python to stand alone exe compiler?

py2exe:
http://www.py2exe.org/

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


From dr.cg at 126.com  Fri Mar 12 23:13:42 2010
From: dr.cg at 126.com (CHEN Guang)
Date: Sat, 13 Mar 2010 12:13:42 +0800 (CST)
Subject: file seek is slow
Message-ID: <3c99dc54.26bd.12755ba44ca.Coremail.dr.cg@126.com>

>> Metalone wrote:
>>> I just tried the seek test with Cython.
>>> Cython fseek() : 1.059 seconds.  30% slower than 'C'
>>> Python f.seek  : 1.458 secondds. 80% slower than 'C'.
>>>
>>> It is amazing to me that Cython generates a 'C' file that is 1478
>>> lines.
>>
>> PythoidC ( http://pythoidc.googlecode.com ) generates the shortest 'C' file.
>> PythoidC is the C language like the Python, by the Python and for the Python.

>Except that it's not a language but rather a syntax converter, i.e. it 
>doesn't really add any features to the C language but rather restricts 
>Python syntax to C language features (plus a bit of header file 
>introspection, it seems, but C's preprocessor has a bit of that, too).
>Stefan

PythoidC is a familar language to Python and C programmers, I do not like
waste my time to create unfamilar things to waste users' time studying. 
In fact PythoidC removed some boring features from C language:
1. no semicolon ; at line ends
2. no braces {} , take Pythonic indent region to express code block
PythoidC restricts C syntax to Python language feature, so that 
C language bacomes friendly to Python programmers and Python IDE. 
PythoidC realized introspection not only on header files but also any C files.
The PythoidC introspection will be as good as Python introspection, 
if only the C header file wirters adds more detailed annotation. 
PythoidC is a familar and convenient C language tool for Python programmers and mixed programming.
plus, PythoidC is realizable only with Python, it's too far beyond C's preprocessor, believe it, or show us. 
CHEN Guang
Convenient C Python mixed programming --- PythoidC ( http://pythoidc.googlecode.com )
 
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From john at castleamber.com  Fri Mar 12 23:26:34 2010
From: john at castleamber.com (John Bokma)
Date: Fri, 12 Mar 2010 22:26:34 -0600
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
Message-ID: <87bpes6e4l.fsf@castleamber.com>

Gabriel Genellina <gagsl-py2 at yahoo.com.ar> writes:

> On 13 mar, 00:26, Robin <rob... at cnsp.com> wrote:
>
>> Does anyone know of a good python to stand alone exe compiler?
>
> http://tinyurl.com/yfcfzz4

Wow, pathetic fuck. You don't have to post you know.

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From morecrown at gmail.com  Fri Mar 12 23:36:46 2010
From: morecrown at gmail.com (Hephzibah)
Date: Fri, 12 Mar 2010 20:36:46 -0800 (PST)
Subject: POS Tagging
References: <1610f59e-b49f-4c5b-ade7-915c92c32b79@q21g2000yqm.googlegroups.com>
	<87aaudnjpo.fsf@castleamber.com>
Message-ID: <14b223b6-10c2-4ee3-9d18-18677a6769c9@d27g2000yqf.googlegroups.com>

On Mar 12, 4:33?pm, John Bokma <j... at castleamber.com> wrote:
> Hephzibah <morecr... at gmail.com> writes:
> > ImportError: No module named numpy
>
> > Can someone pls. tell me what I'm supposed to do next?
>
> Install numpy would be my first guess.
>
> --
> John Bokma ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? j3b
>
> Hacking & Hiking in Mexico - ?http://johnbokma.com/http://castleamber.com/- Perl & Python Development

Thanks so much

I've been able to resolve the issue.
What  I did was to run the program after downloading and installing
i. a newer version of Python -version 26
ii. pyPAML
iii.numpy
iv.matplotlib; all from www.nltk.org.

regards,
Hephzibah



From clp2 at rebertia.com  Fri Mar 12 23:47:31 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 12 Mar 2010 20:47:31 -0800
Subject: python to exe
In-Reply-To: <4B9B17B3.8000307@cnsp.com>
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<50697b2c1003122012q3c2530bt79666118bc639b87@mail.gmail.com>
	<4B9B17B3.8000307@cnsp.com>
Message-ID: <50697b2c1003122047l5b8fa440lc6f1389b58d02df@mail.gmail.com>

On Fri, Mar 12, 2010 at 8:42 PM, robin <robin1 at cnsp.com> wrote:
> On 3/12/2010 9:12 PM, Chris Rebert wrote:
>> On Fri, Mar 12, 2010 at 7:26 PM, Robin<robin1 at cnsp.com> ?wrote:
>>> Does anyone know of a good python to stand alone exe compiler?
>>>
>> py2exe:
>> http://www.py2exe.org/
>
> do you ?of an alternate compilter it doesn't work (py2exe) on my windows 7
> box, I hate windows7 THanks Robin

Nope; py2exe is pretty much the go-to tool for this.
Try asking on their mailinglist:
https://lists.sourceforge.net/lists/listinfo/py2exe-users

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


From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 13 01:47:47 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 13 Mar 2010 06:47:47 GMT
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
	<87bpes6e4l.fsf@castleamber.com>
Message-ID: <4b9b3513$0$27822$c3e8da3@news.astraweb.com>

On Fri, 12 Mar 2010 22:26:34 -0600, John Bokma wrote:

> Gabriel Genellina <gagsl-py2 at yahoo.com.ar> writes:
> 
>> On 13 mar, 00:26, Robin <rob... at cnsp.com> wrote:
>>
>>> Does anyone know of a good python to stand alone exe compiler?
>>
>> http://tinyurl.com/yfcfzz4
> 
> Wow, pathetic fuck. You don't have to post you know.

Gabriel is one of the more helpful and newbie-friendly of the frequent 
posters on this newsgroup. Even if his actions were worthy of your abuse 
(and they aren't), he gets at least one Get Out Of Jail Free card for his 
long-term helpfulness.

Speaking as somebody who finds Let Me Google That For You to be tiresome 
and not at all amusing, nevertheless I support Gabriel's actions. By 
merely giving Robin the answer, Robin doesn't learn how to find out the 
answer to simple questions himself, and by rewarding his laziness, we 
make a rod for our own back.

As the old proverb goes: give a man a fish, and you feed him for a day. 
Teach him how to fish, and he has food forever.

I'm an old-fashioned kind of guy, and don't like LMGTFY because it is 
tiresome and requires Javascript. I prefer:

Google is your friend:

http://www.google.com/search?q=python+standalone+exe

Oh, and Robin, since you have apparently already tried py2exe and found 
it doesn't work on Windows 7, you should have said so from the start, 
instead of wasting everyone's time.



-- 
Steven


From ugocupcic at gmail.com  Sat Mar 13 03:04:31 2010
From: ugocupcic at gmail.com (Ugo Cupcic)
Date: Sat, 13 Mar 2010 08:04:31 +0000
Subject: question regarding wxSlider
In-Reply-To: <8EA74011-1EA0-42CB-BAF5-F9A9F1FF2D16@semanchuk.com>
References: <df20a30d1003121056t66be663ds127aba6b9e679675@mail.gmail.com> 
	<8EA74011-1EA0-42CB-BAF5-F9A9F1FF2D16@semanchuk.com>
Message-ID: <df20a30d1003130004u6386d0bbp41bfedb356f88a90@mail.gmail.com>

Hi Philip,

Thanks for your redirection. I'll try with them :)

Cheers,

Ugo

PS : yes developing  a robotic hand is really fun :D

On Fri, Mar 12, 2010 at 7:08 PM, Philip Semanchuk <philip at semanchuk.com>wrote:

> On Mar 12, 2010, at 1:56 PM, Ugo Cupcic wrote:
>
>  Hi all,
>>
>> I have a question regarding wxSlider. I'm developing a wxwidget python
>> interface for a robotic hand. The sliders send the target values to the
>> joints.
>>
>> I'd like to display the current position of the joint on the slider. I
>> wanted to use wxSlider.SetTick(myposition) but I couldn't get SetTick to
>> display anything.
>>
>> Anyone has an idea ? I attached a dummy code to the message to illustrate.
>>
>
>
> Hi Ugo,
> I don't mean to chase you away, but there is a dedicated wxPython mailing
> list where you obviously have a much better chance of getting an answer.
>
> http://www.wxpython.org/maillist.php
>
> Developing a robotic hand sounds like fun!
>
> Cheers
> Philip
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
              Ugo Cupcic
http://www.genugo.com/ugocupcic
   _
  ' v '
/      \
 m m
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From agoretoy at gmail.com  Sat Mar 13 03:42:36 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Sat, 13 Mar 2010 02:42:36 -0600
Subject: execute bash builtins in python
In-Reply-To: <c9d33c541003121057l703689cxf886c4bdbdec4742@mail.gmail.com>
References: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com> 
	<hnder4$bvg$1@dough.gmane.org>
	<c9d33c541003121057l703689cxf886c4bdbdec4742@mail.gmail.com>
Message-ID: <c9d33c541003130042j75044335x841ea7ce4d21c312@mail.gmail.com>

I found this to be even better; maybe someone will find this useful, who
knows.
just export PS1, duh
Popen(["bash -c 'export PS1='python'; source
$HOME/.bashrc;alias'"],shell=True,stdout=PIPE).stdout.read()

-Alex Goretoy
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From g.bogle at auckland.no.spam.ac.nz  Sat Mar 13 04:38:29 2010
From: g.bogle at auckland.no.spam.ac.nz (Gib Bogle)
Date: Sat, 13 Mar 2010 22:38:29 +1300
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
Message-ID: <hnfmek$o5a$1@speranza.aioe.org>

Steven D'Aprano wrote:

> As the old proverb goes: give a man a fish, and you feed him for a day. 
> Teach him how to fish, and he has food forever.

I like this version:

Light a man a fire, and you keep him warm for hours.  Set a man on fire, and you 
keep him warm for the rest of his life.

;-)


From dr.cg at 126.com  Sat Mar 13 05:02:31 2010
From: dr.cg at 126.com (CHEN Guang)
Date: Sat, 13 Mar 2010 18:02:31 +0800 (CST)
Subject: python to exe
Message-ID: <1e3b567.3797.12756f99dda.Coremail.dr.cg@126.com>

>Does anyone know of a good python to stand alone exe compiler?

>Thanks,
>-Robin

I tried several such tools and found the easiest one: Pyinstaller ( http://www.pyinstaller.org/ )
but it does not make your script faster, if you want it as fast as C language, 
please try PythoidC ( http://pythoidc.googlecode.com )
 
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From alfps at start.no  Sat Mar 13 05:35:41 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Sat, 13 Mar 2010 11:35:41 +0100
Subject: python to exe
In-Reply-To: <hnfmek$o5a$1@speranza.aioe.org>
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
	<hnfmek$o5a$1@speranza.aioe.org>
Message-ID: <hnfppv$hpe$1@news.eternal-september.org>

* Gib Bogle:
> Steven D'Aprano wrote:
> 
>> As the old proverb goes: give a man a fish, and you feed him for a 
>> day. Teach him how to fish, and he has food forever.
> 
> I like this version:
> 
> Light a man a fire, and you keep him warm for hours.  Set a man on fire, 
> and you keep him warm for the rest of his life.
> 
> ;-)

Hey! I was going to post that! And there it was, in the next article... :-)

Cheers,

- Alf


From breamoreboy at yahoo.co.uk  Sat Mar 13 05:58:15 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Sat, 13 Mar 2010 10:58:15 +0000
Subject: python to exe
In-Reply-To: <hnfmek$o5a$1@speranza.aioe.org>
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>	<87bpes6e4l.fsf@castleamber.com>	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
	<hnfmek$o5a$1@speranza.aioe.org>
Message-ID: <hnfr2r$qk0$1@dough.gmane.org>

Gib Bogle wrote:
> Steven D'Aprano wrote:
> 
>> As the old proverb goes: give a man a fish, and you feed him for a 
>> day. Teach him how to fish, and he has food forever.
> 
> I like this version:
> 
> Light a man a fire, and you keep him warm for hours.  Set a man on fire, 
> and you keep him warm for the rest of his life.
> 
> ;-)

I'm certain that members of the Guinea Pig Club might have something to 
say on that one, see :-
http://en.wikipedia.org/wiki/Guinea_Pig_Club



From usenot at geekmail.INVALID  Sat Mar 13 06:41:38 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Sat, 13 Mar 2010 12:41:38 +0100
Subject: to create variable from dict
References: <4859ed52-7276-4617-b25e-902b52cfe7c5@s36g2000prh.googlegroups.com>
	<ecc59606-b4c2-418f-9cb2-27e9b2c47714@o30g2000yqb.googlegroups.com>
Message-ID: <20100313124138.6d981759@geekmail.INVALID>

On Fri, 12 Mar 2010 06:50:18 -0800 (PST) Luis M. Gonz?lez
<luismgz at gmail.com> wrote:

> The question is: should you do it?

And the answer is: No.

And the usual disclaimer is: (Unless you *know* it's the best possible
solution to your problem.)

/W

-- 
INVALID? DE!



From steve at holdenweb.com  Sat Mar 13 08:08:24 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 13 Mar 2010 08:08:24 -0500
Subject: execute bash builtins in python
In-Reply-To: <c9d33c541003130042j75044335x841ea7ce4d21c312@mail.gmail.com>
References: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com>
	<hnder4$bvg$1@dough.gmane.org>	<c9d33c541003121057l703689cxf886c4bdbdec4742@mail.gmail.com>
	<c9d33c541003130042j75044335x841ea7ce4d21c312@mail.gmail.com>
Message-ID: <hng2p6$gaa$1@dough.gmane.org>

alex goretoy wrote:
> I found this to be even better; maybe someone will find this useful, who
> knows.
> just export PS1, duh
> Popen(["bash -c 'export PS1='python'; source
> $HOME/.bashrc;alias'"],shell=True,stdout=PIPE).stdout.read()
> 
Try using an interactive shell:

>>> from subprocess import *
>>> p1 = Popen("bash -i -c alias", stdout=PIPE, shell=True)
>>> p1.stdout.read()
"alias ls='ls --color=auto'\n"
>>>

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Sat Mar 13 08:09:34 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 13 Mar 2010 08:09:34 -0500
Subject: python to exe
In-Reply-To: <87bpes6e4l.fsf@castleamber.com>
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
	<87bpes6e4l.fsf@castleamber.com>
Message-ID: <hng2rb$g8g$1@dough.gmane.org>

John Bokma wrote:
> Gabriel Genellina <gagsl-py2 at yahoo.com.ar> writes:
> 
>> On 13 mar, 00:26, Robin <rob... at cnsp.com> wrote:
>>
>>> Does anyone know of a good python to stand alone exe compiler?
>> http://tinyurl.com/...
> 
> Wow, pathetic fuck. You don't have to post you know.
> 
And you don't have to give Google a second chance at indexing the URL,
but we all make mistakes.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Sat Mar 13 08:11:07 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 13 Mar 2010 08:11:07 -0500
Subject: python to exe
In-Reply-To: <hnfmek$o5a$1@speranza.aioe.org>
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>	<87bpes6e4l.fsf@castleamber.com>	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
	<hnfmek$o5a$1@speranza.aioe.org>
Message-ID: <hng2u8$g8g$2@dough.gmane.org>

Gib Bogle wrote:
> Steven D'Aprano wrote:
> 
>> As the old proverb goes: give a man a fish, and you feed him for a
>> day. Teach him how to fish, and he has food forever.
> 
> I like this version:
> 
> Light a man a fire, and you keep him warm for hours.  Set a man on fire,
> and you keep him warm for the rest of his life.
> 
> ;-)

I like "Give a man a fish, and he eats for a day. Teach a man to fish
and he will bore you with stories of the one that got away for the rest
of his life".

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Sat Mar 13 08:15:49 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 13 Mar 2010 08:15:49 -0500
Subject: Python for newbies (Pythno users group in Macedonia)
In-Reply-To: <hpgq67-gai.ln1@archaeopteryx.softver.org.mk>
References: <hpgq67-gai.ln1@archaeopteryx.softver.org.mk>
Message-ID: <hng372$g8g$3@dough.gmane.org>

?????? ??????????? wrote:
> Hi all,
> we are starting with bi-monthly Python User Group meetings in Skopje, 
> Macedonia. The meetings are targeted for both beginners and more 
> experienced users.
> 
> The basic idea is to have an 1 hour presentation at the start for the 
> beginners and an 1 hour ad-hoc discussion about projects, applications, 
> interesting stuff etc.
> 
> I'd like to gather some guidance/experince/thoughts about some beginner 
> oriented python lectures we could use?
> 
> My first idea was to do something like the "Python module of the Week", 
> but maybe there's a better approach?
> 
> thanks
> 
If you are all English-speakers then perhaps you could consider showing
a PyCon video - see

  http://pycon.blip.tv

Good luck with the group. I hope to see PyCon Macedonia emerging before
too long!

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From vicente.soler at gmail.com  Sat Mar 13 08:16:52 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sat, 13 Mar 2010 05:16:52 -0800 (PST)
Subject: print formatting
Message-ID: <755bdc36-0fb2-4953-9549-148d0e090a68@o3g2000yqb.googlegroups.com>

Hello,

My script contains a print statement:

         print '%40s     %15d' % (k, m)

However,

         1- the string is right adjusted, and I would like it left
adjusted
         2- the number is a decimal number, and I would like it with
the thousands separator and 2 decimals

If possible, the thousands separator and the decimal separator should
use my local settings.

Is there any way to achieve this?


From steve at holdenweb.com  Sat Mar 13 08:31:32 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 13 Mar 2010 08:31:32 -0500
Subject: print formatting
In-Reply-To: <755bdc36-0fb2-4953-9549-148d0e090a68@o3g2000yqb.googlegroups.com>
References: <755bdc36-0fb2-4953-9549-148d0e090a68@o3g2000yqb.googlegroups.com>
Message-ID: <hng44h$k6t$1@dough.gmane.org>

vsoler wrote:
> Hello,
> 
> My script contains a print statement:
> 
>          print '%40s     %15d' % (k, m)
> 
> However,
> 
>          1- the string is right adjusted, and I would like it left
> adjusted
>          2- the number is a decimal number, and I would like it with
> the thousands separator and 2 decimals
> 
> If possible, the thousands separator and the decimal separator should
> use my local settings.
> 
> Is there any way to achieve this?

Left-alignment is achieved by using a negative width.

You can use the locale module to generate thousands-separated numeric
string representations:

>>> from locale import *
>>> setlocale(LC_ALL, '') # locale is otherwise 'C'
'en_US.UTF-8'
>>> locale.format("%12.3f", 123456.789, grouping=False)
'  123456.789'
>>> locale.format("%12.3f", 123456.789, grouping=True)
' 123,456.789'

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From __peter__ at web.de  Sat Mar 13 08:37:50 2010
From: __peter__ at web.de (Peter Otten)
Date: Sat, 13 Mar 2010 14:37:50 +0100
Subject: print formatting
References: <755bdc36-0fb2-4953-9549-148d0e090a68@o3g2000yqb.googlegroups.com>
Message-ID: <hng4fa$4qr$00$1@news.t-online.com>

vsoler wrote:

> My script contains a print statement:
> 
>          print '%40s     %15d' % (k, m)
> 
> However,
> 
>          1- the string is right adjusted, and I would like it left
> adjusted
>          2- the number is a decimal number, and I would like it with
> the thousands separator and 2 decimals
> 
> If possible, the thousands separator and the decimal separator should
> use my local settings.
> 
> Is there any way to achieve this?

>>> import locale
>>> locale.setlocale(locale.LC_ALL, "")
'de_DE.UTF-8'

Traditional:
>>> print '%-40s|%15s' % (k, locale.format("%d", m, grouping=True))
hello                                   |      1.234.567

New:
>>> "{0:<40} {1:15n}".format(k, m)
'hello                                          1.234.567'

See also:
http://docs.python.org/dev/py3k/library/string.html#formatstrings

Peter


From python at bdurham.com  Sat Mar 13 08:45:06 2010
From: python at bdurham.com (python at bdurham.com)
Date: Sat, 13 Mar 2010 08:45:06 -0500
Subject: python to exe
In-Reply-To: <50697b2c1003122047l5b8fa440lc6f1389b58d02df@mail.gmail.com>
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com><50697b2c1003122012q3c2530bt79666118bc639b87@mail.gmail.com><4B9B17B3.8000307@cnsp.com>
	<50697b2c1003122047l5b8fa440lc6f1389b58d02df@mail.gmail.com>
Message-ID: <1268487906.15871.1364627963@webmail.messagingengine.com>

Robin,

> do you of an alternate compilter it doesn't work (py2exe) on my windows 7 box

I can assure you that Py2exe does work on Windows 7 (my firm develops
commercial Python applications packaged using Py2exe running on Windows
7), but it does take a bit of fiddling and some patience. Join the
py2exe newsgroup and post your problems there.
https://lists.sourceforge.net/lists/listinfo/py2exe-users

You may also want to google 'Gui2exe'. This is a free front-end to
Py2exe that you can use to generate your Py2exe setup.py scripts. Note
that Gui2exe requires wxPython (free) to run.

Finally, make sure you are trying to compile 32-bit Python 2.x code. I
don't think py2exe supports Python 3.x or 64-bit versions of Python yet.

> Nope; py2exe is pretty much the go-to tool for this.

I hear great things about PyInstaller. The project is not dead - make
sure you use the latest version in the SVN.

Search stackoverflow.com for positive feedback and tips on PyInstaller.
Its on our plate to take a good look this product 'one of these days'.

Good luck!

Malcolm


From albert at spenarnc.xs4all.nl  Sat Mar 13 09:53:35 2010
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 13 Mar 2010 14:53:35 GMT
Subject: Question about typing: ints/floats
References: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
	<b800048f-b09e-4c39-bf15-9bcd3dae11bc@y11g2000yqh.googlegroups.com>
	<mailman.266.1267666113.23598.python-list@python.org>
Message-ID: <kz86pb.hbu@spenarnc.xs4all.nl>

In article <mailman.266.1267666113.23598.python-list at python.org>,
MRAB  <python at mrabarnett.plus.com> wrote:
>Zeeshan Quireshi wrote:
>> On Mar 3, 6:45 pm, Wells <thewellsoli... at gmail.com> wrote:
>>> This seems sort of odd to me:
>>>
>>>>>> a = 1
>>>>>> a += 1.202
>>>>>> a
>>> 2.202
>>>
>>> Indicates that 'a' was an int that was implicitly casted to a float.
>>> But:
>>>
>>>>>> a = 1
>>>>>> b = 3
>>>>>> a / b
>>> 0
>>>
>>> This does not implicitly do the casting, it treats 'a' and 'b' as
>>> integers, and the result as well. Changing 'b' to 3.0 will yield a
>>> float as a result (0.33333333333333331)
>>>
>>> Is there some way to explain the consistency here? Does python
>>> implicitly change the casting when you add variables of a different
>>> numeric type?
>>>
>>> Anyway, just  curiosity more than anything else. Thanks!
>>
>> Python, like most other languages performs only integer division when
>> both the operands are ints. So only if one of the types is a flot or
>> you explicitly cast your expression to be a double, then the value
>> will be a fraction. otherwise you will the quotient.
>
>int + int gives int
>float + float gives float
>int + float gives float

You skip a step here that the OP may have missed.
a = 1
a += 1.222
This invokes the calculation
    1 + 1.222
which is int + float.

Groetjes Albert

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- being exponential -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From karper12345 at yahoo.com  Sat Mar 13 09:55:07 2010
From: karper12345 at yahoo.com (Karjer Jdfjdf)
Date: Sat, 13 Mar 2010 06:55:07 -0800 (PST)
Subject: Use python and Jython together? (newbie)
Message-ID: <254688.8813.qm@web44705.mail.sp1.yahoo.com>

I'm pretty new at programming and want some advice on mixing Jython and Python.

I want to use Jython to access some Java libraries, but I want to keep developing in normal Python. Some modules I use a lot are not available in Jython.

The bulk of my programming is in Python but I want to use Java 2D libraries for graphical presentation of data generated in normal Python. Is it possible that I generate data in Python and then pass it through to a Jython program to visualise the data.



      
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From vicente.soler at gmail.com  Sat Mar 13 10:05:06 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sat, 13 Mar 2010 07:05:06 -0800 (PST)
Subject: building a dict
Message-ID: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>

Say that "m" is a tuple of 2-tuples

m=(('as',3), ('ab',5), (None, 1), ('as',None), ('as',6))

and I need to build a "d" dict where each key has an associated list
whose first element is the count, and the second is the sum. If a 2-
tuple contains a None value, it should be discarded.

The expected result is:
d={'as':[2, 9], 'ab': [1,5]}

How should I proceed? So far I have been unsuccessful. I have tried
with a "for" loop.

Thank you for your help


From lists at cheimes.de  Sat Mar 13 10:10:22 2010
From: lists at cheimes.de (Christian Heimes)
Date: Sat, 13 Mar 2010 16:10:22 +0100
Subject: Use python and Jython together? (newbie)
In-Reply-To: <254688.8813.qm@web44705.mail.sp1.yahoo.com>
References: <254688.8813.qm@web44705.mail.sp1.yahoo.com>
Message-ID: <4B9BAADE.7090208@cheimes.de>

Karjer Jdfjdf wrote:
> I'm pretty new at programming and want some advice on mixing Jython and Python.
> 
> I want to use Jython to access some Java libraries, but I want to keep developing in normal Python. Some modules I use a lot are not available in Jython.
> 
> The bulk of my programming is in Python but I want to use Java 2D libraries for graphical presentation of data generated in normal Python. Is it possible that I generate data in Python and then pass it through to a Jython program to visualise the data.

You can't mix Jython and Python in one program. But you can use other
means to create bindings for Java code. JCC
(http://pypi.python.org/pypi/JCC/2.5.1) is a very powerful code
generator for CPython.

Christian


From joncle at googlemail.com  Sat Mar 13 10:25:45 2010
From: joncle at googlemail.com (Jon Clements)
Date: Sat, 13 Mar 2010 07:25:45 -0800 (PST)
Subject: building a dict
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
Message-ID: <7f3ae1a0-5de8-4c98-9eec-086b7d927c5c@t41g2000yqt.googlegroups.com>

On 13 Mar, 15:05, vsoler <vicente.so... at gmail.com> wrote:
> Say that "m" is a tuple of 2-tuples
>
> m=(('as',3), ('ab',5), (None, 1), ('as',None), ('as',6))
>
> and I need to build a "d" dict where each key has an associated list
> whose first element is the count, and the second is the sum. If a 2-
> tuple contains a None value, it should be discarded.
>
> The expected result is:
> d={'as':[2, 9], 'ab': [1,5]}
>
> How should I proceed? So far I have been unsuccessful. I have tried
> with a "for" loop.
>
> Thank you for your help

Something like:

d = defaultdict( lambda: [0,0] )
for key, val in filter(lambda L: not any(i is None for i in L), m):
    d[key][0] += 1
    d[key][1] += val

hth

Jon


From pmaupin at gmail.com  Sat Mar 13 10:28:19 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sat, 13 Mar 2010 07:28:19 -0800 (PST)
Subject: building a dict
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
Message-ID: <3f56c242-7bf5-40c6-96d4-881d052db39a@o30g2000yqb.googlegroups.com>

On Mar 13, 9:05?am, vsoler <vicente.so... at gmail.com> wrote:
> Say that "m" is a tuple of 2-tuples
>
> m=(('as',3), ('ab',5), (None, 1), ('as',None), ('as',6))
>
> and I need to build a "d" dict where each key has an associated list
> whose first element is the count, and the second is the sum. If a 2-
> tuple contains a None value, it should be discarded.
>
> The expected result is:
> d={'as':[2, 9], 'ab': [1,5]}
>
> How should I proceed? So far I have been unsuccessful. I have tried
> with a "for" loop.

Post your first try at a for loop, and people might be willing to
point out problems, but this is such a basic for loop that it is
unlikely that anybody is going to write your ENTIRE homework for you.

Regards,
Pat


From albert at spenarnc.xs4all.nl  Sat Mar 13 10:29:54 2010
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 13 Mar 2010 15:29:54 GMT
Subject: Reverse engineering CRC?
References: <7vj7fdFnnjU1@mid.individual.net>
Message-ID: <kz88du.hk0@spenarnc.xs4all.nl>

In article <7vj7fdFnnjU1 at mid.individual.net>,
Gregory Ewing  <greg.ewing at canterbury.ac.nz> wrote:
>Given some known data/crc pairs, how feasible is it to
>figure out the polynomial being used to generate the crc?
>
>In the case I'm looking at, it appears that the crc
>size may be at least 24 bits, so just trying all possible
>polynomials probably isn't doable.
>
>An article I found hints at the possibility of using
>GCDs to make the search more efficient, but doesn't go
>into any details. Anyone know of any literature about
>this?
>
>If it helps, I have the ability to generate test cases
>with known message contents to some extent, although
>I don't have complete control over the contents. Also
>it's a manual process, so generating large numbers of
>them automatically isn't an option.

If it is really a CRC, it is doable.

You can have an indication, if the intention is to detect
machine errors (transmission or disk errors) or they want
you to prevent tampering with the file.
In the latter case it may be a one-way hash. Then it is near
impossible, as this is the design criterion for a one-way hash.

>--
>Greg

Groetjes Albert

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- being exponential -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From steve at holdenweb.com  Sat Mar 13 10:36:46 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 13 Mar 2010 10:36:46 -0500
Subject: building a dict
In-Reply-To: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
Message-ID: <hngbfd$8uu$1@dough.gmane.org>

vsoler wrote:
> Say that "m" is a tuple of 2-tuples
> 
> m=(('as',3), ('ab',5), (None, 1), ('as',None), ('as',6))
> 
> and I need to build a "d" dict where each key has an associated list
> whose first element is the count, and the second is the sum. If a 2-
> tuple contains a None value, it should be discarded.
> 
> The expected result is:
> d={'as':[2, 9], 'ab': [1,5]}
> 
> How should I proceed? So far I have been unsuccessful. I have tried
> with a "for" loop.
> 
> Thank you for your help

Here's a fairly simple-minded approach using a defaultdict, which calls
the dflt() function to create a value when the key is absent.

>>> from collections import defaultdict
>>> def dflt():
...     return [0, 0]
...
>>> m = (('as',3), ('ab',5), (None, 1), ('as',None), ('as',6))
>>> d = defaultdict(dflt)
>>> for key, n in m:
...   if key is not None and n is not None:
...     c, t = d[key]
...     d[key] = [c+1, t+n]
...
>>> d
defaultdict(<function dflt at 0x7f0bcb1b0ed8>,
{'as': [2, 9], 'ab': [1, 5]})
>>>

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From piet at vanoostrum.org  Sat Mar 13 10:41:12 2010
From: piet at vanoostrum.org (Piet van Oostrum)
Date: Sat, 13 Mar 2010 16:41:12 +0100
Subject: Ideas for creating processes
References: <36dec4ff1003101352g7d159742j2a0c76a6b0cd23fb@mail.gmail.com>
	<mailman.579.1268258709.23598.python-list@python.org>
Message-ID: <m2hbok6xgn.fsf@cochabamba.vanoostrum.org>

>>>>> J <dreadpiratejeff at gmail.com> (J) wrote:

>J> And now I'm looking at subprocess and I can set shell=True and it will
>J> intrepret special characters like &

>J> So could I do something like this:

>J> for item in pathlist:
>J>     subprocess.Popen('rsync command &', shell=True)

>J> and simply wait unti they are all done?

Using shell=True is often the wrong thing to do. And certainly just to
get a process to run in the background. subprocess will run them in the
background by default. Besides if you do it in the way you propose you
can't wait for them. You can only wait for the shell that starts the
rsync, but that will be finished almost immediately.

>>> import subprocess
>>> p = subprocess.Popen('sleep 1000 &', shell=True)
>>> p.wait()
0
>>>
The wait() returns immediately.
-- 
Piet van Oostrum <piet at vanoostrum.org>
WWW: http://pietvanoostrum.com/
PGP key: [8DAE142BE17999C4]
Nu Fair Trade woonaccessoires op http://www.zylja.com


From joncle at googlemail.com  Sat Mar 13 10:58:02 2010
From: joncle at googlemail.com (Jon Clements)
Date: Sat, 13 Mar 2010 07:58:02 -0800 (PST)
Subject: building a dict
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
	<3f56c242-7bf5-40c6-96d4-881d052db39a@o30g2000yqb.googlegroups.com>
Message-ID: <251a5a61-aa10-4050-bc0e-da36aed10697@i25g2000yqm.googlegroups.com>

On 13 Mar, 15:28, Patrick Maupin <pmau... at gmail.com> wrote:
> On Mar 13, 9:05?am, vsoler <vicente.so... at gmail.com> wrote:
>
> > Say that "m" is a tuple of 2-tuples
>
> > m=(('as',3), ('ab',5), (None, 1), ('as',None), ('as',6))
>
> > and I need to build a "d" dict where each key has an associated list
> > whose first element is the count, and the second is the sum. If a 2-
> > tuple contains a None value, it should be discarded.
>
> > The expected result is:
> > d={'as':[2, 9], 'ab': [1,5]}
>
> > How should I proceed? So far I have been unsuccessful. I have tried
> > with a "for" loop.
>
> Post your first try at a for loop, and people might be willing to
> point out problems, but this is such a basic for loop that it is
> unlikely that anybody is going to write your ENTIRE homework for you.
>
> Regards,
> Pat

I was thinking it's possibly homework, but looking at previous posts
it's fairly unlikely.

(If it is, then mea culpa, but as Steve has replied, I think I'll
manage to sleep tonight not worrying about the influx of uneducated,
incompetent and otherwise useless developers to the market).

However, they're receiving some 'elegant' solutions which no professor
(unless they're a star pupil - in which case they wouldn't be asking)
would take as having been done by their selves.
(Or at least I hope not)

But yes, I would certainly be interested in the 'unsuccessful
attempt'.
(To the OP, do post your attempts, it does give more validity).


Cheers,

Jon.



From dreamscmtr63 at gmail.com  Sat Mar 13 11:02:07 2010
From: dreamscmtr63 at gmail.com (earner)
Date: Sat, 13 Mar 2010 08:02:07 -0800 (PST)
Subject: Work at Home - Earn 50, 000 Weekly Without Investment Its Not A Fake, 
	100% Earning   Guarantee
Message-ID: <c8af3ba6-f87a-4ee3-b7c7-c003fe9d8f3e@t34g2000prm.googlegroups.com>

Work at Home - Earn 50,000 Weekly Without Investment Its Not A Fake,
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From rurpy at yahoo.com  Sat Mar 13 11:13:51 2010
From: rurpy at yahoo.com (rurpy at yahoo.com)
Date: Sat, 13 Mar 2010 08:13:51 -0800 (PST)
Subject: building a dict
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
	<3f56c242-7bf5-40c6-96d4-881d052db39a@o30g2000yqb.googlegroups.com>
Message-ID: <289d7e7f-a068-487e-a918-17a39110d0f7@e1g2000yqh.googlegroups.com>

On Mar 13, 8:28 am, Patrick Maupin <pmau... at gmail.com> wrote:
> On Mar 13, 9:05 am, vsoler <vicente.so... at gmail.com> wrote:
>
> > Say that "m" is a tuple of 2-tuples
>
> > m=(('as',3), ('ab',5), (None, 1), ('as',None), ('as',6))
>
> > and I need to build a "d" dict where each key has an associated list
> > whose first element is the count, and the second is the sum. If a 2-
> > tuple contains a None value, it should be discarded.
>
> > The expected result is:
> > d={'as':[2, 9], 'ab': [1,5]}
>
> > How should I proceed? So far I have been unsuccessful. I have tried
> > with a "for" loop.
>
> Post your first try at a for loop, and people might be willing to
> point out problems, but this is such a basic for loop that it is
> unlikely that anybody is going to write your ENTIRE homework for you.

This is probably what you (OP) were trying to come up with?
[untested]

d = {}
for item in m:
    key = m[0];  value = m[1]
    if key is None or value is None: continue
    if key not in dict:
        d[key] = [value]
    else:
        d[key].append (value)

You can replace the
  for item in m:
      key = m[0];  value = m[1]
above with
  for key, value in m:
which is a little nicer.

However, as other responses point out, when you want
to "accumulate" results in a dict, collections.defaultdict
should pop into your mind first.


From mehgcap at gmail.com  Sat Mar 13 11:14:37 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Sat, 13 Mar 2010 11:14:37 -0500
Subject: wx error, I suspect my class
Message-ID: <bc7f680c1003130814vcc48f0bie61d40fa10505037@mail.gmail.com>

Hello all,
I am trying to make a gui out of xrc and wxpython, but I think my
understanding of Python's class/method structure is causing problems.
The below code returns an error on the line
  panel=xrc.XRCCTRL(mf, "dl")
The error goes back to wxPython itself and says "attribute error:
'none' type object has no attribute 'FindWindowById'"
Here is my complete code:

import wx
from wx import xrc

class myapp(wx.App):
 def OnInit(self):
  #load the xrc file
  res=xrc.XmlResource('dictionary.xrc')

  #load the frame containing everything else
  mf=res.LoadFrame(None, "mainframe")

  #assign all necessary controls to variables (text boxes and buttons)
for easier binding
  #format: varName=xrc.XRCCTRL(parent, IDFromXRCFile)
  panel=xrc.XRCCTRL(mf, "dl")
  btn_go=xrc.XRCCTRL(panel, "btn_go")
  btn_close=xrc.XRCCTRL(panel, "btn_close")

  #now bind the gui controls to functions
  mf.Bind(wx.EVT_BUTTON, close, id=xrc.XRCID("btn_close"))
  mf.Show()
 #end def OnInit

 def close(self):
  mf.Close(True)
 #end def close
#end class myapp

win=myapp(False)
win.MainLoop()

That is all there is to it. I made the xrc file with XRCed, so I know
it is properly formatted. I always see Python methods and classes
using the "self" keyword, but I never understood why or when to/not to
use it. I probably need it in the above code, but I am not sure how to
insert it correctly. I have been fighting with this code for the last
two days with no progress, so I would greatly appreciate any help you
can provide. Thanks.


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From joncle at googlemail.com  Sat Mar 13 11:19:09 2010
From: joncle at googlemail.com (Jon Clements)
Date: Sat, 13 Mar 2010 08:19:09 -0800 (PST)
Subject: Decorator to inject function into __call__ of a class
Message-ID: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>

This is semi-experimental and I'd appreciate opinions of whether it's
the correct design approach or not. It seems like a good idea, but it
doesn't mean it is.

I have a class 'A', this provides standard support functions and
exception handling.
I have 'B' and 'C' which specialise upon 'A'

What I'd like to achieve is something similar to:

@inject(B):
 def some_function(a, b):
     pass # something useful

The name 'some_function' is completely redundant -- don't need it,
don't actually care about the function afterwards, as long as it
becomes a __call__ of a 'B' *instance*.

I've basically got a huge list of functions, which need to be the
callable method of an object, and possibly at run-time, so I don't
want to do:

class Something(B):
    def __call__(self, etc.. etc...):
         pass # do something

I've got as far as type(somename, (B,), {}) -- do I then __init__ or
__new__ the object or...

In short, the function should be the __call__ method of an object that
is already __init__'d with the function arguments -- so that when the
object is called, I get the result of the the function (based on the
objects values).

Hope that makes sense,

Cheers,

Jon.








From missive at hotmail.com  Sat Mar 13 11:23:07 2010
From: missive at hotmail.com (Lee Harr)
Date: Sat, 13 Mar 2010 20:53:07 +0430
Subject: Some PyCon videos won't play
Message-ID: <SNT106-W28E9678F29E5527CFCBB88B1300@phx.gbl>


I am having a great time watching videos from PyCon. Thanks to
everyone who presented, and to those who did such a great job
putting the videos up at: http://pycon.blip.tv/

My trouble is that, although most of the videos play perfectly,
there are a few that refuse to play at all. Like:

Python 101
http://pycon.blip.tv/file/3322312/

Using Python to Create Robotic Simulations for Planetary Exploration
http://pycon.blip.tv/file/3332780/

Saturday Morning Lightning talks
http://pycon.blip.tv/file/3264041/


Is anyone else having trouble with these?

 		 	   		  
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From pmaupin at gmail.com  Sat Mar 13 11:26:15 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sat, 13 Mar 2010 08:26:15 -0800 (PST)
Subject: Decorator to inject function into __call__ of a class
References: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>
Message-ID: <83cfee5e-6b6a-41e1-b259-9fdf104423b8@u9g2000yqb.googlegroups.com>

On Mar 13, 10:19?am, Jon Clements <jon... at googlemail.com> wrote:

> What I'd like to achieve is something similar to:
>
> @inject(B):
> ?def some_function(a, b):
> ? ? ?pass # something useful

So, just typing at the keyboard here, you mean something like:

class InjectClass(object):
    def __init__(self, func, *args, **kw):
        self.func = func
        self.args = args
        self.kw = kw
    def __call__(self):
        self.func(*self.args, **self.kw)

Or exactly what are you looking for?

Pat


From rurpy at yahoo.com  Sat Mar 13 11:26:59 2010
From: rurpy at yahoo.com (rurpy at yahoo.com)
Date: Sat, 13 Mar 2010 08:26:59 -0800 (PST)
Subject: building a dict
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
	<3f56c242-7bf5-40c6-96d4-881d052db39a@o30g2000yqb.googlegroups.com> 
	<289d7e7f-a068-487e-a918-17a39110d0f7@e1g2000yqh.googlegroups.com>
Message-ID: <91def698-98ba-4d63-b647-c13467e2a8c0@k17g2000yqb.googlegroups.com>

On Mar 13, 9:13?am, ru... at yahoo.com wrote:
> On Mar 13, 8:28 am, Patrick Maupin <pmau... at gmail.com> wrote:
>
>
>
> > On Mar 13, 9:05 am, vsoler <vicente.so... at gmail.com> wrote:
>
> > > Say that "m" is a tuple of 2-tuples
>
> > > m=(('as',3), ('ab',5), (None, 1), ('as',None), ('as',6))
>
> > > and I need to build a "d" dict where each key has an associated list
> > > whose first element is the count, and the second is the sum. If a 2-
> > > tuple contains a None value, it should be discarded.
>
> > > The expected result is:
> > > d={'as':[2, 9], 'ab': [1,5]}
>
> > > How should I proceed? So far I have been unsuccessful. I have tried
> > > with a "for" loop.
>
> > Post your first try at a for loop, and people might be willing to
> > point out problems, but this is such a basic for loop that it is
> > unlikely that anybody is going to write your ENTIRE homework for you.
>
> This is probably what you (OP) were trying to come up with?
> [untested]
>
> d = {}
> for item in m:
> ? ? key = m[0]; ?value = m[1]
> ? ? if key is None or value is None: continue
> ? ? if key not in dict:
> ? ? ? ? d[key] = [value]
> ? ? else:
> ? ? ? ? d[key].append (value)
>
> You can replace the
> ? for item in m:
> ? ? ? key = m[0]; ?value = m[1]
> above with
> ? for key, value in m:
> which is a little nicer.
>
> However, as other responses point out, when you want
> to "accumulate" results in a dict, collections.defaultdict
> should pop into your mind first.

Oops, didn't read very carefully, did I?

That should be:
d = {}
for item in m:
    key = m[0];  value = m[1]
    if key is None or value is None: continue
    if key not in dict:
        d[key] = [1, value]
    else:
        d[key][0] += 1
        d[key][1] += value



From joncle at googlemail.com  Sat Mar 13 11:38:16 2010
From: joncle at googlemail.com (Jon Clements)
Date: Sat, 13 Mar 2010 08:38:16 -0800 (PST)
Subject: Decorator to inject function into __call__ of a class
References: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>
	<83cfee5e-6b6a-41e1-b259-9fdf104423b8@u9g2000yqb.googlegroups.com>
Message-ID: <c3ea1b37-796c-42ba-96b4-688d8b6ced1f@g28g2000yqh.googlegroups.com>

On 13 Mar, 16:26, Patrick Maupin <pmau... at gmail.com> wrote:
> On Mar 13, 10:19?am, Jon Clements <jon... at googlemail.com> wrote:
>
> > What I'd like to achieve is something similar to:
>
> > @inject(B):
> > ?def some_function(a, b):
> > ? ? ?pass # something useful
>
> So, just typing at the keyboard here, you mean something like:
>
> class InjectClass(object):
> ? ? def __init__(self, func, *args, **kw):
> ? ? ? ? self.func = func
> ? ? ? ? self.args = args
> ? ? ? ? self.kw = kw
> ? ? def __call__(self):
> ? ? ? ? self.func(*self.args, **self.kw)
>
> Or exactly what are you looking for?
>
> Pat

Not quite.

Let's say I have function 'F':

def add(a, b): return a + b

And a base class of 'C' which does all the __init__ stuff or
whatever's needed,
the function 'add' should return a new class __init__'d with a and b,
but 'add'
should be the __call__ of that instance.

Hope that makes sense, and TY for your post,

Jon.


From jackdied at gmail.com  Sat Mar 13 11:42:51 2010
From: jackdied at gmail.com (Jack Diederich)
Date: Sat, 13 Mar 2010 11:42:51 -0500
Subject: Decorator to inject function into __call__ of a class
In-Reply-To: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>
References: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>
Message-ID: <b8e622741003130842l17935171xb3a75e372e59395b@mail.gmail.com>

On Sat, Mar 13, 2010 at 11:19 AM, Jon Clements <joncle at googlemail.com> wrote:
> This is semi-experimental and I'd appreciate opinions of whether it's
> the correct design approach or not. It seems like a good idea, but it
> doesn't mean it is.
>
> I have a class 'A', this provides standard support functions and
> exception handling.
> I have 'B' and 'C' which specialise upon 'A'
>
> What I'd like to achieve is something similar to:
>
> @inject(B):
> ?def some_function(a, b):
> ? ? pass # something useful
>
> The name 'some_function' is completely redundant -- don't need it,
> don't actually care about the function afterwards, as long as it
> becomes a __call__ of a 'B' *instance*.
>
> I've basically got a huge list of functions, which need to be the
> callable method of an object, and possibly at run-time, so I don't
> want to do:
>
> class Something(B):
> ? ?def __call__(self, etc.. etc...):
> ? ? ? ? pass # do something
>
> I've got as far as type(somename, (B,), {}) -- do I then __init__ or
> __new__ the object or...
>
> In short, the function should be the __call__ method of an object that
> is already __init__'d with the function arguments -- so that when the
> object is called, I get the result of the the function (based on the
> objects values).

I'm not sure exactly what you are asking for, but if what you want is
a bunch of different objects that vary only by their class's __call__
you could do it with a function that returns a new class based on A
but with a new __call__:

def make_new_call_class(base_class, call_func):
  class NewClass(base_class):
    def __call__(self, *args, **kw):
      return call_func(self, *args, *kw)
  return NewClass

or the return could even be NewClass() [return an instance] if this is
a one off.

That said, I'm not really sure what this behavior is good for.

-Jack


From pmaupin at gmail.com  Sat Mar 13 12:03:00 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sat, 13 Mar 2010 09:03:00 -0800 (PST)
Subject: Decorator to inject function into __call__ of a class
References: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>
	<83cfee5e-6b6a-41e1-b259-9fdf104423b8@u9g2000yqb.googlegroups.com> 
	<c3ea1b37-796c-42ba-96b4-688d8b6ced1f@g28g2000yqh.googlegroups.com>
Message-ID: <7c9e6c13-f388-44b9-8fc3-1faaacd8680a@t23g2000yqt.googlegroups.com>

On Mar 13, 10:38?am, Jon Clements <jon... at googlemail.com> wrote:
> On 13 Mar, 16:26, Patrick Maupin <pmau... at gmail.com> wrote:
>
>
>
> > On Mar 13, 10:19?am, Jon Clements <jon... at googlemail.com> wrote:
>
> > > What I'd like to achieve is something similar to:
>
> > > @inject(B):
> > > ?def some_function(a, b):
> > > ? ? ?pass # something useful
>
> > So, just typing at the keyboard here, you mean something like:
>
> > class InjectClass(object):
> > ? ? def __init__(self, func, *args, **kw):
> > ? ? ? ? self.func = func
> > ? ? ? ? self.args = args
> > ? ? ? ? self.kw = kw
> > ? ? def __call__(self):
> > ? ? ? ? self.func(*self.args, **self.kw)
>
> > Or exactly what are you looking for?
>
> > Pat
>
> Not quite.
>
> Let's say I have function 'F':
>
> def add(a, b): return a + b
>
> And a base class of 'C' which does all the __init__ stuff or
> whatever's needed,
> the function 'add' should return a new class __init__'d with a and b,
> but 'add'
> should be the __call__ of that instance.
>
> Hope that makes sense, and TY for your post,
>
> Jon.

Well, you could do it with a class.  But if I'm understanding
correctly, maybe it's simpler than that:

>>> def inject(*args, **kw):
...     def wrapper(func):
...         def go():
...             return func(*args, **kw)
...         return go
...     return wrapper
...
>>> @inject(20, 22)
... def add(a, b):
...     return a + b
...
>>> add()
42


From jlundell at pobox.com  Sat Mar 13 12:03:36 2010
From: jlundell at pobox.com (JLundell)
Date: Sat, 13 Mar 2010 09:03:36 -0800 (PST)
Subject: class inheritance
Message-ID: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>

I've got a subclass of fractions.Fraction called Value; it's a mostly
trivial class, except that it overrides __eq__ to mean 'nearly equal'.
However, since Fraction's operations result in a Fraction, not a
Value, I end up with stuff like this:

x = Value(1) + Value(2)

where x is now a Fraction, not a Value, and x == y uses
Fraction.__eq__ rather than Value.__eq__.

This appears to be standard Python behavior (int does the same thing).
I've worked around it by overriding __add__, etc, with functions that
invoke Fraction but coerce the result. But that's tedious; there are a
lot of methods to override.

So I'm wondering: is there a more efficient way to accomplish what I'm
after?


From pmaupin at gmail.com  Sat Mar 13 12:09:20 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sat, 13 Mar 2010 09:09:20 -0800 (PST)
Subject: class inheritance
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
Message-ID: <59af7283-f362-4d1e-92c7-14eab59555dd@g19g2000yqe.googlegroups.com>

On Mar 13, 11:03?am, JLundell <jlund... at pobox.com> wrote:
> I've got a subclass of fractions.Fraction called Value; it's a mostly
> trivial class, except that it overrides __eq__ to mean 'nearly equal'.
> However, since Fraction's operations result in a Fraction, not a
> Value, I end up with stuff like this:
>
> x = Value(1) + Value(2)
>
> where x is now a Fraction, not a Value, and x == y uses
> Fraction.__eq__ rather than Value.__eq__.
>
> This appears to be standard Python behavior (int does the same thing).
> I've worked around it by overriding __add__, etc, with functions that
> invoke Fraction but coerce the result. But that's tedious; there are a
> lot of methods to override.
>
> So I'm wondering: is there a more efficient way to accomplish what I'm
> after?

7 years ago, I had a similar problem for a different and now obsolete
reason.  I'm sure my solution could be easily updated though.  I wrote
code to write a wrapper class.  Sort of a meta-module.  Original
reference here:

http://groups.google.com/group/comp.lang.python/browse_frm/thread/1253bbab7dfd4b/59289c16603fb374?hl=en&lnk=gst&q=pmaupin+userint#59289c16603fb374

HTH,
Pat


From joncle at googlemail.com  Sat Mar 13 12:10:02 2010
From: joncle at googlemail.com (Jon Clements)
Date: Sat, 13 Mar 2010 09:10:02 -0800 (PST)
Subject: Decorator to inject function into __call__ of a class
References: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>
	<mailman.710.1268498573.23598.python-list@python.org>
Message-ID: <305a95c3-792e-4949-b1eb-20d794ed3218@g7g2000yqe.googlegroups.com>

On 13 Mar, 16:42, Jack Diederich <jackd... at gmail.com> wrote:
> On Sat, Mar 13, 2010 at 11:19 AM, Jon Clements <jon... at googlemail.com> wrote:
> > This is semi-experimental and I'd appreciate opinions of whether it's
> > the correct design approach or not. It seems like a good idea, but it
> > doesn't mean it is.
>
> > I have a class 'A', this provides standard support functions and
> > exception handling.
> > I have 'B' and 'C' which specialise upon 'A'
>
> > What I'd like to achieve is something similar to:
>
> > @inject(B):
> > ?def some_function(a, b):
> > ? ? pass # something useful
>
> > The name 'some_function' is completely redundant -- don't need it,
> > don't actually care about the function afterwards, as long as it
> > becomes a __call__ of a 'B' *instance*.
>
> > I've basically got a huge list of functions, which need to be the
> > callable method of an object, and possibly at run-time, so I don't
> > want to do:
>
> > class Something(B):
> > ? ?def __call__(self, etc.. etc...):
> > ? ? ? ? pass # do something
>
> > I've got as far as type(somename, (B,), {}) -- do I then __init__ or
> > __new__ the object or...
>
> > In short, the function should be the __call__ method of an object that
> > is already __init__'d with the function arguments -- so that when the
> > object is called, I get the result of the the function (based on the
> > objects values).
>
> I'm not sure exactly what you are asking for, but if what you want is
> a bunch of different objects that vary only by their class's __call__
> you could do it with a function that returns a new class based on A
> but with a new __call__:
>
> def make_new_call_class(base_class, call_func):
> ? class NewClass(base_class):
> ? ? def __call__(self, *args, **kw):
> ? ? ? return call_func(self, *args, *kw)
> ? return NewClass
>
> or the return could even be NewClass() [return an instance] if this is
> a one off.
>
> That said, I'm not really sure what this behavior is good for.
>
> -Jack

Cheers Jack for the response.

The behaviour is to not derive from a class, but rather allow
the decorators to do so... so I would like to iterate over
a list of functions (don't care what they're called) and then
inject the function as a method. If needs be at run-time.

Say I have 1000 functions (okay, admittedly over quoted), but
I don't want every programmer to inherit from 'B' or 'C', but
to 'inject'. So the idea is that classes are pre-defined, have
predictable behaviour, *except* the __call__ is different.

You are correct in this. Why do I want that behaviour? ->

- It's easier, no inheriting from a class, when needs not.
- Some integrity (anyone can define a function and 'inject' to the
Management class)
- Easier maintainability - maybe :)

for i in function_list:
    i = inject(function_list)

At the end of the day:
def blah(x, y, z):
   pass

That should be the callable of the object.

Cheers again,

Jon.



From rurpy at yahoo.com  Sat Mar 13 12:16:16 2010
From: rurpy at yahoo.com (rurpy at yahoo.com)
Date: Sat, 13 Mar 2010 09:16:16 -0800 (PST)
Subject: building a dict
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
	<3f56c242-7bf5-40c6-96d4-881d052db39a@o30g2000yqb.googlegroups.com> 
	<289d7e7f-a068-487e-a918-17a39110d0f7@e1g2000yqh.googlegroups.com> 
	<91def698-98ba-4d63-b647-c13467e2a8c0@k17g2000yqb.googlegroups.com>
Message-ID: <c40c6804-4870-4195-8766-732e10323184@e1g2000yqh.googlegroups.com>

On Mar 13, 9:26?am, ru... at yahoo.com wrote:
> That should be:
> d = {}
> for item in m:
  ? ? key = item[0]; ?value = item[1]
> ? ? if key is None or value is None: continue
> ? ? if key not in dict:
> ? ? ? ? d[key] = [1, value]
> ? ? else:
> ? ? ? ? d[key][0] += 1
> ? ? ? ? d[key][1] += value

That's it.  Any other mistakes, you find 'em.



From jackdied at gmail.com  Sat Mar 13 12:37:45 2010
From: jackdied at gmail.com (Jack Diederich)
Date: Sat, 13 Mar 2010 12:37:45 -0500
Subject: class inheritance
In-Reply-To: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
Message-ID: <b8e622741003130937j6a162a43g98d4896a21e6ef93@mail.gmail.com>

On Sat, Mar 13, 2010 at 12:03 PM, JLundell <jlundell at pobox.com> wrote:
> I've got a subclass of fractions.Fraction called Value; it's a mostly
> trivial class, except that it overrides __eq__ to mean 'nearly equal'.
> However, since Fraction's operations result in a Fraction, not a
> Value, I end up with stuff like this:
>
> x = Value(1) + Value(2)
>
> where x is now a Fraction, not a Value, and x == y uses
> Fraction.__eq__ rather than Value.__eq__.
>
> This appears to be standard Python behavior (int does the same thing).
> I've worked around it by overriding __add__, etc, with functions that
> invoke Fraction but coerce the result. But that's tedious; there are a
> lot of methods to override.
>
> So I'm wondering: is there a more efficient way to accomplish what I'm
> after?

If Fraction.__add__ returns a new object but the subclass Value is
compatible (as I would except since it is a sublcass) then just change
all references in Franction.__add__ to be more generic, ex/

class Franction():
  def __add__(self, other):
    return self.__classs__(self.denominator + other.denominator)

That way if __add__ is called by an instance of a subclass it will
return an instance of that subclass.

-Jack


From jackdied at gmail.com  Sat Mar 13 12:42:01 2010
From: jackdied at gmail.com (Jack Diederich)
Date: Sat, 13 Mar 2010 12:42:01 -0500
Subject: Decorator to inject function into __call__ of a class
In-Reply-To: <305a95c3-792e-4949-b1eb-20d794ed3218@g7g2000yqe.googlegroups.com>
References: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>
	<mailman.710.1268498573.23598.python-list@python.org>
	<305a95c3-792e-4949-b1eb-20d794ed3218@g7g2000yqe.googlegroups.com>
Message-ID: <b8e622741003130942s5b6b0430hb451be95221e6dcd@mail.gmail.com>

On Sat, Mar 13, 2010 at 12:10 PM, Jon Clements <joncle at googlemail.com> wrote:
> On 13 Mar, 16:42, Jack Diederich <jackd... at gmail.com> wrote:
>> On Sat, Mar 13, 2010 at 11:19 AM, Jon Clements <jon... at googlemail.com> wrote:
>> > This is semi-experimental and I'd appreciate opinions of whether it's
>> > the correct design approach or not. It seems like a good idea, but it
>> > doesn't mean it is.
>>
>> > I have a class 'A', this provides standard support functions and
>> > exception handling.
>> > I have 'B' and 'C' which specialise upon 'A'
>>
>> > What I'd like to achieve is something similar to:
>>
>> > @inject(B):
>> > ?def some_function(a, b):
>> > ? ? pass # something useful
>>
>> > The name 'some_function' is completely redundant -- don't need it,
>> > don't actually care about the function afterwards, as long as it
>> > becomes a __call__ of a 'B' *instance*.
>>
>> > I've basically got a huge list of functions, which need to be the
>> > callable method of an object, and possibly at run-time, so I don't
>> > want to do:
>>
>> > class Something(B):
>> > ? ?def __call__(self, etc.. etc...):
>> > ? ? ? ? pass # do something
>>
>> > I've got as far as type(somename, (B,), {}) -- do I then __init__ or
>> > __new__ the object or...
>>
>> > In short, the function should be the __call__ method of an object that
>> > is already __init__'d with the function arguments -- so that when the
>> > object is called, I get the result of the the function (based on the
>> > objects values).
>>
>> I'm not sure exactly what you are asking for, but if what you want is
>> a bunch of different objects that vary only by their class's __call__
>> you could do it with a function that returns a new class based on A
>> but with a new __call__:
>>
>> def make_new_call_class(base_class, call_func):
>> ? class NewClass(base_class):
>> ? ? def __call__(self, *args, **kw):
>> ? ? ? return call_func(self, *args, *kw)
>> ? return NewClass
>>
>> or the return could even be NewClass() [return an instance] if this is
>> a one off.
>>
>> That said, I'm not really sure what this behavior is good for.
>>
>> -Jack
>
> Cheers Jack for the response.
>
> The behaviour is to not derive from a class, but rather allow
> the decorators to do so... so I would like to iterate over
> a list of functions (don't care what they're called) and then
> inject the function as a method. If needs be at run-time.
>
> Say I have 1000 functions (okay, admittedly over quoted), but
> I don't want every programmer to inherit from 'B' or 'C', but
> to 'inject'. So the idea is that classes are pre-defined, have
> predictable behaviour, *except* the __call__ is different.
>
> You are correct in this. Why do I want that behaviour? ->
>
> - It's easier, no inheriting from a class, when needs not.
> - Some integrity (anyone can define a function and 'inject' to the
> Management class)
> - Easier maintainability - maybe :)
>
> for i in function_list:
> ? ?i = inject(function_list)
>
> At the end of the day:
> def blah(x, y, z):
> ? pass
>
> That should be the callable of the object.

I'm still not sure why you are trying to do this, but you can do it
with delegation.  Have the parent class's __call__ look for an
instance attribute named call_this and then call it, ex/

class A():
  def __call__(self, *args, **kw):
    self.call_this(*args, **kw)  # we grab this off the instance

ob = A()
def my_func(*stuff): pass
ob.call_this = my_func

-Jack


From pmaupin at gmail.com  Sat Mar 13 12:44:38 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sat, 13 Mar 2010 09:44:38 -0800 (PST)
Subject: class inheritance
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
	<mailman.711.1268501867.23598.python-list@python.org>
Message-ID: <5e8a6388-7532-4183-a69e-bc4330e34b83@t20g2000yqe.googlegroups.com>

On Mar 13, 11:37?am, Jack Diederich <jackd... at gmail.com> wrote:
> If Fraction.__add__ returns a new object but the subclass Value is
> compatible (as I would except since it is a sublcass) then just change
> all references in Franction.__add__ to be more generic, ex/
>
> class Franction():
> ? def __add__(self, other):
> ? ? return self.__classs__(self.denominator + other.denominator)
>
> That way if __add__ is called by an instance of a subclass it will
> return an instance of that subclass.
>

Yes, I think the OP understands that, and also understands that he
would have to do the same thing for __sub__, __div__, __rsub__,
__radd__, etc.

That's why I suggested that, instead of writing all that tedious code,
he could write code that writes the tedious code :-)

As Terence Parr of ANTLER fame asks:  "Why program by hand in five
days what you can spend five years of your life automating?"

Pat


From martin.schoon at gmail.com  Sat Mar 13 13:04:19 2010
From: martin.schoon at gmail.com (Martin =?utf-8?B?U2Now7bDtm4=?=)
Date: Sat, 13 Mar 2010 19:04:19 +0100
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
	<hnfmek$o5a$1@speranza.aioe.org>
	<mailman.698.1268477864.23598.python-list@python.org>
Message-ID: <87aaucxfmk.fsf@crunchbang.Belkin>

Mark Lawrence <breamoreboy at yahoo.co.uk> writes:
>
> I'm certain that members of the Guinea Pig Club might have something
> to say on that one, see :-
> http://en.wikipedia.org/wiki/Guinea_Pig_Club

Interesting. My mum is a retired surgeon and in the mid 1980s she
attended a course in plastic surgery and among other things she
learnt that plastic surgery got going for real during WWII 'thanks'
to all pilots with burns. I have forwarded the link above to her.

/Martin


From jlundell at pobox.com  Sat Mar 13 13:11:15 2010
From: jlundell at pobox.com (JLundell)
Date: Sat, 13 Mar 2010 10:11:15 -0800 (PST)
Subject: class inheritance
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
	<mailman.711.1268501867.23598.python-list@python.org>
Message-ID: <e43530db-4a8a-42ef-8ac1-cb622a99d247@w27g2000pre.googlegroups.com>

On Mar 13, 9:37?am, Jack Diederich <jackd... at gmail.com> wrote:
> If Fraction.__add__ returns a new object but the subclass Value is
> compatible (as I would except since it is a sublcass) then just change
> all references in Franction.__add__ to be more generic, ex/
>
> class Franction():
> ? def __add__(self, other):
> ? ? return self.__classs__(self.denominator + other.denominator)
>
> That way if __add__ is called by an instance of a subclass it will
> return an instance of that subclass.

That was my first thought, because I had originally assumed that's the
way Fraction worked. However, a) it's easier to do the overriding in
my own class than patching Fraction (or at least no harder), and 2)
Fraction is only doing the same thing that int does, so it's hard to
justify a patch.

I think Patrick's solution might be the tidiest one. I'll give it a
shot (thanks, Patrick).


From python at mrabarnett.plus.com  Sat Mar 13 13:13:46 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 13 Mar 2010 18:13:46 +0000
Subject: Use python and Jython together? (newbie)
In-Reply-To: <254688.8813.qm@web44705.mail.sp1.yahoo.com>
References: <254688.8813.qm@web44705.mail.sp1.yahoo.com>
Message-ID: <4B9BD5DA.1060907@mrabarnett.plus.com>

Karjer Jdfjdf wrote:
> I'm pretty new at programming and want some advice on mixing Jython and 
> Python.
> 
> I want to use Jython to access some Java libraries, but I want to keep 
> developing in normal Python. Some modules I use a lot are not available 
> in Jython.
> 
> The bulk of my programming is in Python but I want to use Java 2D 
> libraries for graphical presentation of data generated in normal Python. 
> Is it possible that I generate data in Python and then pass it through 
> to a Jython program to visualise the data.
> 
You could have 2 scripts running, one in CPython and the other in
Jython, communicating via sockets. You would need to decide on a
protocol, perhaps passing the data as strings encoded in UTF-8.


From news1234 at free.fr  Sat Mar 13 13:45:53 2010
From: news1234 at free.fr (News123)
Date: Sat, 13 Mar 2010 19:45:53 +0100
Subject: how to start a python script only once
Message-ID: <4b9bdd61$0$22515$426a74cc@news.free.fr>

Hi,

I'd like to make sure, that a certain python program will only be run
once per host. (linux/windows)


so if the program is started a second time it should just terminate and
let the other one run.

This does not have to be the fastest solution, but it should be reliable.


I have a few ideas, but wonder, which one is the most common


My ideas so far:

pid file and file locking
--------------------------
create a file like program.pid  with the pid of the running program an
use file locking to avoid race connditions.

However I currently don't know how to do file locking under windows
and I don't know how to do file lockng with python and linux.
I'll start googling.

sqlite and locking
--------------------
quite some time ago I used a mysql table and locking as an inter-host mutex.

Perhaps sqlite would be good enough for an inter process mutex for
processes on the same host, but I don't know it well enough.


interprocess mutex
--------------------
well I even don't know whether something like this exists on linux / windows


Thanks in advanced for any tips



N


From john at castleamber.com  Sat Mar 13 13:52:39 2010
From: john at castleamber.com (John Bokma)
Date: Sat, 13 Mar 2010 12:52:39 -0600
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
Message-ID: <87fx443vgo.fsf@castleamber.com>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:

> As the old proverb goes: give a man a fish, and you feed him for a day. 
> Teach him how to fish, and he has food forever.

True, but you don't teach someone fishing by poking an eye out with a
fishing rod.

> I'm an old-fashioned kind of guy, and don't like LMGTFY because it is 
> tiresome and requires Javascript. I prefer:

My reply had little to do with lmgtfy and all to do with hiding it behind
tinyurl. But even then, why not do what you just did: give a URL to
google directly.

For quite some time I thought that comp.lang.perl.misc was quite
unfriendly because of a certain attitude. comp.lang.python was quite a
refreshment for a while: very newbie friendly, less pissing contests,
etc. (but way more fanboism). 

Yesterday was a sady day: I finally had to conclude that it was only
wishful thinking on my part; there is no difference.

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From tjreedy at udel.edu  Sat Mar 13 14:01:34 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 13 Mar 2010 14:01:34 -0500
Subject: Some PyCon videos won't play
In-Reply-To: <SNT106-W28E9678F29E5527CFCBB88B1300@phx.gbl>
References: <SNT106-W28E9678F29E5527CFCBB88B1300@phx.gbl>
Message-ID: <hngnee$df1$1@dough.gmane.org>

On 3/13/2010 11:23 AM, Lee Harr wrote:
>
> I am having a great time watching videos from PyCon. Thanks to
> everyone who presented, and to those who did such a great job
> putting the videos up at: http://pycon.blip.tv/
>
> My trouble is that, although most of the videos play perfectly,
> there are a few that refuse to play at all. Like:
>
> Python 101
> http://pycon.blip.tv/file/3322312/
>
> Using Python to Create Robotic Simulations for Planetary Exploration
> http://pycon.blip.tv/file/3332780/
>
> Saturday Morning Lightning talks
> http://pycon.blip.tv/file/3264041/
>
>
> Is anyone else having trouble with these?

Yes, 'spinner' spins indefinitely, while others load and play.



From apt.shansen at gmail.com  Sat Mar 13 14:02:34 2010
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sat, 13 Mar 2010 11:02:34 -0800
Subject: Decorator to inject function into __call__ of a class
In-Reply-To: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>
References: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>
Message-ID: <7a9c25c21003131102x15f7e98agfc1c6ea73962ead1@mail.gmail.com>

On Sat, Mar 13, 2010 at 8:19 AM, Jon Clements <joncle at googlemail.com> wrote:

> The name 'some_function' is completely redundant -- don't need it,
> don't actually care about the function afterwards, as long as it
> becomes a __call__ of a 'B' *instance*.
>

Special methods are looked up on the class, not the instance, so you can't
dot his. However, from reading this thread, I think you're just a bit hung
up on naming: you don't need these random / arbitrary functions to be the
__call__ on an instance.

You need these functions to be called when said instance is called.

The easiest way to do that is simply define on the class:

def __call__(self, *args, **kwargs):
    self.func(*args, **kwargs)

Then while you are iterating over your list of a thousand functions and
making instances, just assign each instance's func attribute.

So,

for fn in [function_one, function_two, function_three, function_four]:
    inst = B()
    inst.func = fn

Now, if you really like the decorator syntax, sure:

>> def inject(klass):
...     def decorator(fn):
...             inst = klass()
...             inst.func = fn
...             return inst
...     return decorator
...
>>> class A:
...     def __init__(self):
...             pass
...     def __call__(self, *args, **kwargs):
...             self.func(*args, **kwargs)
...
>>> @inject(A)
... def test(mmm):
...     print mmm
...
>>> test
<__main__.A instance at 0x1004a4fc8>
>>> test("Hello")
Hello

Now, I don't -fully- understand what you're trying to do so this may not be
precisely the right thing, but you should be able to adapt the theory.

--S
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From joncle at googlemail.com  Sat Mar 13 14:02:44 2010
From: joncle at googlemail.com (Jon Clements)
Date: Sat, 13 Mar 2010 11:02:44 -0800 (PST)
Subject: Decorator to inject function into __call__ of a class
References: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>
	<mailman.710.1268498573.23598.python-list@python.org>
	<305a95c3-792e-4949-b1eb-20d794ed3218@g7g2000yqe.googlegroups.com>
	<mailman.712.1268502128.23598.python-list@python.org>
Message-ID: <714d79b0-af65-4ce1-806a-73aa1e9b561d@t20g2000yqe.googlegroups.com>

On 13 Mar, 17:42, Jack Diederich <jackd... at gmail.com> wrote:
> On Sat, Mar 13, 2010 at 12:10 PM, Jon Clements <jon... at googlemail.com> wrote:
> > On 13 Mar, 16:42, Jack Diederich <jackd... at gmail.com> wrote:
> >> On Sat, Mar 13, 2010 at 11:19 AM, Jon Clements <jon... at googlemail.com> wrote:
> >> > This is semi-experimental and I'd appreciate opinions of whether it's
> >> > the correct design approach or not. It seems like a good idea, but it
> >> > doesn't mean it is.
>
> >> > I have a class 'A', this provides standard support functions and
> >> > exception handling.
> >> > I have 'B' and 'C' which specialise upon 'A'
>
> >> > What I'd like to achieve is something similar to:
>
> >> > @inject(B):
> >> > ?def some_function(a, b):
> >> > ? ? pass # something useful
>
> >> > The name 'some_function' is completely redundant -- don't need it,
> >> > don't actually care about the function afterwards, as long as it
> >> > becomes a __call__ of a 'B' *instance*.
>
> >> > I've basically got a huge list of functions, which need to be the
> >> > callable method of an object, and possibly at run-time, so I don't
> >> > want to do:
>
> >> > class Something(B):
> >> > ? ?def __call__(self, etc.. etc...):
> >> > ? ? ? ? pass # do something
>
> >> > I've got as far as type(somename, (B,), {}) -- do I then __init__ or
> >> > __new__ the object or...
>
> >> > In short, the function should be the __call__ method of an object that
> >> > is already __init__'d with the function arguments -- so that when the
> >> > object is called, I get the result of the the function (based on the
> >> > objects values).
>
> >> I'm not sure exactly what you are asking for, but if what you want is
> >> a bunch of different objects that vary only by their class's __call__
> >> you could do it with a function that returns a new class based on A
> >> but with a new __call__:
>
> >> def make_new_call_class(base_class, call_func):
> >> ? class NewClass(base_class):
> >> ? ? def __call__(self, *args, **kw):
> >> ? ? ? return call_func(self, *args, *kw)
> >> ? return NewClass
>
> >> or the return could even be NewClass() [return an instance] if this is
> >> a one off.
>
> >> That said, I'm not really sure what this behavior is good for.
>
> >> -Jack
>
> > Cheers Jack for the response.
>
> > The behaviour is to not derive from a class, but rather allow
> > the decorators to do so... so I would like to iterate over
> > a list of functions (don't care what they're called) and then
> > inject the function as a method. If needs be at run-time.
>
> > Say I have 1000 functions (okay, admittedly over quoted), but
> > I don't want every programmer to inherit from 'B' or 'C', but
> > to 'inject'. So the idea is that classes are pre-defined, have
> > predictable behaviour, *except* the __call__ is different.
>
> > You are correct in this. Why do I want that behaviour? ->
>
> > - It's easier, no inheriting from a class, when needs not.
> > - Some integrity (anyone can define a function and 'inject' to the
> > Management class)
> > - Easier maintainability - maybe :)
>
> > for i in function_list:
> > ? ?i = inject(function_list)
>
> > At the end of the day:
> > def blah(x, y, z):
> > ? pass
>
> > That should be the callable of the object.
>
> I'm still not sure why you are trying to do this, but you can do it
> with delegation. ?Have the parent class's __call__ look for an
> instance attribute named call_this and then call it, ex/
>
> class A():
> ? def __call__(self, *args, **kw):
> ? ? self.call_this(*args, **kw) ?# we grab this off the instance
>
> ob = A()
> def my_func(*stuff): pass
> ob.call_this = my_func
>
> -Jack

Jack, thanks very much for your replies -- hugely appreciated.

I was delayed by the missus calling me for dinner - I'd forgotten
we had a stew going in the slow cooker, and she can't make
dumplings to save her life :)

If I can re-explain slightly, say I have a class 'compute':

class Compute(object):
    def __init__(self, something):
        self.something = something
    # misc other methods here.....

then...

class ComputeAdd(Compute):
    pass

If I do,

@inject
def ComputeAdd(fst, snd):
    return fst + snd

The end result should be a new class called ComputeAdd __init__'d with
fst and snd,
which when called, returns fst + snd.

Hope that makes sense.

Cheers,

Jon.



From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 13 14:23:08 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 13 Mar 2010 19:23:08 GMT
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
	<87fx443vgo.fsf@castleamber.com>
Message-ID: <4b9be61c$0$27822$c3e8da3@news.astraweb.com>

On Sat, 13 Mar 2010 12:52:39 -0600, John Bokma wrote:

> For quite some time I thought that comp.lang.perl.misc was quite
> unfriendly because of a certain attitude. comp.lang.python was quite a
> refreshment for a while: very newbie friendly, less pissing contests,
> etc. (but way more fanboism).
> 
> Yesterday was a sady day: I finally had to conclude that it was only
> wishful thinking on my part; there is no difference.


You were the first one to inject abuse into this thread. There's a big 
difference between a mildly sarcastic link and dropping the F-word at one 
of the more helpful and respected members of the community. Perhaps you 
are projecting your own hostility and aggro onto others?



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 13 14:48:28 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 13 Mar 2010 19:48:28 GMT
Subject: Decorator to inject function into __call__ of a class
References: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>
	<mailman.710.1268498573.23598.python-list@python.org>
	<305a95c3-792e-4949-b1eb-20d794ed3218@g7g2000yqe.googlegroups.com>
	<mailman.712.1268502128.23598.python-list@python.org>
	<714d79b0-af65-4ce1-806a-73aa1e9b561d@t20g2000yqe.googlegroups.com>
Message-ID: <4b9bec0b$0$27822$c3e8da3@news.astraweb.com>

On Sat, 13 Mar 2010 11:02:44 -0800, Jon Clements wrote:

> If I can re-explain slightly, say I have a class 'compute':
> 
> class Compute(object):
>     def __init__(self, something):
>         self.something = something
>     # misc other methods here.....
> 
> then...
> 
> class ComputeAdd(Compute):
>     pass


What's the purpose of the do-nothing subclass?


> If I do,
> 
> @inject
> def ComputeAdd(fst, snd):
>     return fst + snd
> 
> The end result should be a new class called ComputeAdd __init__'d with
> fst and snd,

That will cause a TypeError, because ComputeAdd inherits __init__ from 
Compute, which only takes a single argument. So you can't initialise it 
with two.


> which when called, returns fst + snd.
>
> Hope that makes sense.

None what so ever, even after reading the entire thread :-)

Forget about the *mechanism*, and focus on the *result* you want. Let me 
see if I can guess what result you want.

You want to start with a single base class, say Compute as defined above.

Then you want to write a function which interacts with Compute somehow, 
say:

def func(self, x, y):
    return self.something + x + y

and wave some sort of magic wand (a decorator? something else?) to get an 
object x so that:

x("a", "b")

returns self.something + "a" + "b".

Is that right? If not, I have no idea what you want! But if this is what 
you want, then this is probably the simplest approach:

Start by adding delegation to the Compute class:

class Compute(object):
    def __init__(self, something):
        self.something = something
    def __call__(self, *args, **kwargs):
        return self.function(*args, **kwargs)

Then you can initialise an instance of Compute, and add a function to it:

def func(self, x, y):
    return self.something + x + y

added = Computer("spam")
added.function = func

And then say:

added("ham", "eggs")
-> "spamhameggs"


You could possibly even turn this into a decorator:

# untested
def magic(baseclass, *args):
    instance = baseclass(*args)
    def decorator(func):
        instance.function = func
        return instance
    return decorator
        
@magic(Compute, "spam")
def func(self, x, y):
    return self.something + x + y


func("ham", "eggs")
-> "spamhameggs"




Hope this helps.


-- 
Steven


From martin.hellwig at dcuktec.org  Sat Mar 13 15:16:48 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Sat, 13 Mar 2010 20:16:48 +0000
Subject: python to exe
In-Reply-To: <4b9be61c$0$27822$c3e8da3@news.astraweb.com>
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>	<87bpes6e4l.fsf@castleamber.com>	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>	<87fx443vgo.fsf@castleamber.com>
	<4b9be61c$0$27822$c3e8da3@news.astraweb.com>
Message-ID: <hngrrc$4at$1@news.eternal-september.org>

On 03/13/10 19:23, Steven D'Aprano wrote:
> On Sat, 13 Mar 2010 12:52:39 -0600, John Bokma wrote:
>
>> For quite some time I thought that comp.lang.perl.misc was quite
>> unfriendly because of a certain attitude. comp.lang.python was quite a
>> refreshment for a while: very newbie friendly, less pissing contests,
>> etc. (but way more fanboism).
>>
>> Yesterday was a sady day: I finally had to conclude that it was only
>> wishful thinking on my part; there is no difference.
>
>
> You were the first one to inject abuse into this thread. There's a big
> difference between a mildly sarcastic link and dropping the F-word at one
> of the more helpful and respected members of the community. Perhaps you
> are projecting your own hostility and aggro onto others?
>
>
>
John's thought process is a slippery slope and I make the same 'mistake' 
(notice the quotes please :-)) so often it would seem I won't learn it 
ever. However on the rare occasion I notice that I am making the mistake 
I say to myself: The view of a number of individuals do NOT necessarily 
represent the view of the majority unless proven otherwise by that 
actual majority.

-- 
mph


From almar.klein at gmail.com  Sat Mar 13 15:17:43 2010
From: almar.klein at gmail.com (Almar Klein)
Date: Sat, 13 Mar 2010 21:17:43 +0100
Subject: python to exe
In-Reply-To: <1e3b567.3797.12756f99dda.Coremail.dr.cg@126.com>
References: <1e3b567.3797.12756f99dda.Coremail.dr.cg@126.com>
Message-ID: <cc38d75f1003131217p593e114ap69238096b412cce3@mail.gmail.com>

>Does anyone know of a good python to stand alone exe compiler?

>
> >Thanks,
> >-Robin
> I tried several such tools and found the easiest one: Pyinstaller (
> http://www.pyinstaller.org/ )
>

Don't forget cx_freeze! I found it to work pretty easy, and it also works
for py3k.

Almar
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From pavlovevidence at gmail.com  Sat Mar 13 15:26:45 2010
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 13 Mar 2010 12:26:45 -0800 (PST)
Subject: class inheritance
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
Message-ID: <9bb4c1e7-858e-4ee6-870b-5a6549b6c496@b36g2000pri.googlegroups.com>

On Mar 13, 9:03?am, JLundell <jlund... at pobox.com> wrote:
> I've got a subclass of fractions.Fraction called Value; it's a mostly
> trivial class, except that it overrides __eq__ to mean 'nearly equal'.
> However, since Fraction's operations result in a Fraction, not a
> Value, I end up with stuff like this:
>
> x = Value(1) + Value(2)
>
> where x is now a Fraction, not a Value, and x == y uses
> Fraction.__eq__ rather than Value.__eq__.
>
> This appears to be standard Python behavior (int does the same thing).
> I've worked around it by overriding __add__, etc, with functions that
> invoke Fraction but coerce the result. But that's tedious; there are a
> lot of methods to override.
>
> So I'm wondering: is there a more efficient way to accomplish what I'm
> after?

It's a tad unfortunately Python doesn't make this easier.  If I had to
do it more than once I'd probably write a mixin to do it:

class ArithmeticSelfCastMixin(object):
    def __add__(self,other):
        return
self.__class__(super(ArithmeticSelfCastMixin,self).__add__(other)
    # etc.


class Value(ArithmeticSelfCastMixin,fraction.Fraction):
    pass


However, I want to warn you about overriding __eq__ to mean "almost
equal": it can have unexpected results so I don't recommend it.  Two
of the main issues with it are:

1. It violates the transitive property ("If A == B and B == C, then A
== C") which most programmers expect to be true.

2. It will give unpredictable results when the objects are used in
sets or as dictionary keys.  Those thow types expect the transitive
property to be true.  If you are going to redefine __eq__ to mean
"almost equal", then at least define __hash__ to raise
NotImplementedError so that Python will refuse to use them in sets or
as dictionary keys:

    def __hash__(self): raise NotImplementedError


Carl Banks


From mcfletch at vrplumber.com  Sat Mar 13 16:12:02 2010
From: mcfletch at vrplumber.com (Mike C. Fletcher)
Date: Sat, 13 Mar 2010 16:12:02 -0500
Subject: Python for newbies (Pythno users group in Macedonia)
In-Reply-To: <hpgq67-gai.ln1@archaeopteryx.softver.org.mk>
References: <hpgq67-gai.ln1@archaeopteryx.softver.org.mk>
Message-ID: <4B9BFFA2.7080305@vrplumber.com>

?????? ??????????? wrote:
> Hi all,
> we are starting with bi-monthly Python User Group meetings in Skopje, 
> Macedonia. The meetings are targeted for both beginners and more 
> experienced users.
>   
...
http://us.pycon.org/2010/conference/schedule/event/108/

HTH,
Mike

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com



From vicente.soler at gmail.com  Sat Mar 13 16:42:12 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sat, 13 Mar 2010 13:42:12 -0800 (PST)
Subject: building a dict
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
	<3f56c242-7bf5-40c6-96d4-881d052db39a@o30g2000yqb.googlegroups.com> 
	<289d7e7f-a068-487e-a918-17a39110d0f7@e1g2000yqh.googlegroups.com> 
	<91def698-98ba-4d63-b647-c13467e2a8c0@k17g2000yqb.googlegroups.com> 
	<c40c6804-4870-4195-8766-732e10323184@e1g2000yqh.googlegroups.com>
Message-ID: <0ed22def-8cb9-47ec-8df8-60439810819a@g10g2000yqh.googlegroups.com>

On 13 mar, 18:16, ru... at yahoo.com wrote:
> On Mar 13, 9:26?am, ru... at yahoo.com wrote:> That should be:
> > d = {}
> > for item in m:
>
> ? ? ? key = item[0]; ?value = item[1]
>
> > ? ? if key is None or value is None: continue
> > ? ? if key not in dict:
> > ? ? ? ? d[key] = [1, value]
> > ? ? else:
> > ? ? ? ? d[key][0] += 1
> > ? ? ? ? d[key][1] += value
>
> That's it. ?Any other mistakes, you find 'em.

Thank you all. Your answers are more than valuable to me. I'll study
them carefully, but no doubt, my post has been answered.

By the way, I suppose I am the OP. Since I am not an native English
speaking person, I do not know what it stands for. Perhaps you can
tell me.

>From what I see from your posts, you would have preferred that I
included in my original post my "for loop", so that the post is not so
abstract. I have taken note and I'll make it better next time.

Thank you for your help.

Vicente Soler


From rurpy at yahoo.com  Sat Mar 13 17:04:54 2010
From: rurpy at yahoo.com (rurpy at yahoo.com)
Date: Sat, 13 Mar 2010 14:04:54 -0800 (PST)
Subject: building a dict
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
	<3f56c242-7bf5-40c6-96d4-881d052db39a@o30g2000yqb.googlegroups.com> 
	<289d7e7f-a068-487e-a918-17a39110d0f7@e1g2000yqh.googlegroups.com> 
	<91def698-98ba-4d63-b647-c13467e2a8c0@k17g2000yqb.googlegroups.com> 
	<c40c6804-4870-4195-8766-732e10323184@e1g2000yqh.googlegroups.com> 
	<0ed22def-8cb9-47ec-8df8-60439810819a@g10g2000yqh.googlegroups.com>
Message-ID: <45fd2042-280c-4b7c-ab1f-54a41f6b0cec@o3g2000yqb.googlegroups.com>

On Mar 13, 2:42?pm, vsoler <vicente.so... at gmail.com> wrote:

> By the way, I suppose I am the OP. Since I am not an native English
> speaking person, I do not know what it stands for. Perhaps you can
> tell me.

OP means Original Poster (the person who started the discussion)
or sometimes Original Post, depending on context.


From g.bogle at auckland.no.spam.ac.nz  Sat Mar 13 17:20:15 2010
From: g.bogle at auckland.no.spam.ac.nz (Gib Bogle)
Date: Sun, 14 Mar 2010 11:20:15 +1300
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>	<87bpes6e4l.fsf@castleamber.com>	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>	<hnfmek$o5a$1@speranza.aioe.org>
	<mailman.698.1268477864.23598.python-list@python.org>
Message-ID: <hnh32u$5j6$2@speranza.aioe.org>

Mark Lawrence wrote:
> 
> I'm certain that members of the Guinea Pig Club might have something to 
> say on that one, see :-
> http://en.wikipedia.org/wiki/Guinea_Pig_Club
> 

You mean, something like: "That's not funny"?


From waldemar.osuch at gmail.com  Sat Mar 13 18:12:11 2010
From: waldemar.osuch at gmail.com (Waldemar Osuch)
Date: Sat, 13 Mar 2010 15:12:11 -0800 (PST)
Subject: Use python and Jython together? (newbie)
References: <254688.8813.qm@web44705.mail.sp1.yahoo.com>
	<mailman.706.1268493031.23598.python-list@python.org>
Message-ID: <60f0beb3-5ad9-4b60-8aa3-b225f3c6cf6b@f8g2000yqn.googlegroups.com>

On Mar 13, 8:10?am, Christian Heimes <li... at cheimes.de> wrote:
> Karjer Jdfjdf wrote:
> > I'm pretty new at programming and want some advice on mixing Jython and Python.
>
> > I want to use Jython to access some Java libraries, but I want to keep developing in normal Python. Some modules I use a lot are not available in Jython.
>
> > The bulk of my programming is in Python but I want to use Java 2D libraries for graphical presentation of data generated in normal Python. Is it possible that I generate data in Python and then pass it through to a Jython program to visualise the data.
>
> You can't mix Jython and Python in one program. But you can use other
> means to create bindings for Java code. JCC
> (http://pypi.python.org/pypi/JCC/2.5.1) is a very powerful code
> generator for CPython.
>
I have not tried it myself but it seems to be possible.
http://jpype.sourceforge.net/



From np.mapn at gmail.com  Sat Mar 13 18:21:38 2010
From: np.mapn at gmail.com (np map)
Date: Sat, 13 Mar 2010 15:21:38 -0800 (PST)
Subject: Clustering and automated configuration & deployment toolkit with 
	Python
Message-ID: <003064f8-e559-41e9-8110-11fad8373d09@y17g2000yqd.googlegroups.com>

I'd like to write an open source clustering (for computation and
general use) and automation of configuration/deployment in Python.
It's main purpose is to be used in academic environments.
It would be something like running numpy/simpy code (and other custom
python code) on a set of machines in a distributed fashion (e.g.
splitting tasks, doing certain bits on some machines, other sub-tasks
on other machines, etc).

The cluster could be used in at least two ways:
- submit code/files via a web interface, monitor the task via the web
interface and download the results from the master node  (user<>web
interface<>master)
- run code directly from another machine on the cluster (as if it were
a subprocess or something like this)


Requirements (so far):
- support the Ubuntu Linux distribution in the initial iteration
- be easy to extend to other OS-es and package managers
- try to be 3.x compatible where dual compatibility is possible (2.x
and 3.x)
- it will support Python 2.5-2.6
- document required changes to the 2.x only code to make it work on
3.x
- make it easy to submit code directly from python scripts to the
cluster (with the right credentials)
- support key based authentication for job submission
- should talk to at least one type of RDBMS to store various types of
data
- the cluster should be able to kill a task on nodes automatically if
it executes for too long or requires too much memory (configurable)
- should be modular (use automation & configuration or just
clustering)


Therefore, I'd like to know a few things:

Is there a clustering toolkit already available for python?

What would the recommended architecture be ?

How should the "user" code interface with the clustering system's
code?

How should the results be stored (at the node and master level)?

Should threading be supported in the tasks?

How should they be returned to the Master node(s)? (polling, submitted
by the nodes, etc)

What libraries should be used for this? (e.g. fabric as a library,
pyro, etc)

Any other suggestions and pieces of advice?

Should Fabric be used in this clustering system for automation? If
not, what else? Would simply using a wrapper written in python for the
'ssh' app be ok?

Would the following architecture be ok?
Master: splits tasks into sub-tasks, sends them to nodes - provided
the node's load isn't greater than a certain percentage, gets results,
stores and provides configuration to nodes, stores results, etc
Node: runs code, applies configuration, submits the results to the
master, etc

If this system actually gets python-level code submission inside, how
should it work?

The reason I posted this set of questions and ideas is that I'd like
this to be as flexible and usable as possible.

Thanks.


From maymunbeyin at gmail.com  Sat Mar 13 19:34:55 2010
From: maymunbeyin at gmail.com (kuru)
Date: Sat, 13 Mar 2010 16:34:55 -0800 (PST)
Subject: Feeding differeent data types to a class instance?
Message-ID: <ac9a5500-6b06-4fee-b483-bab76922b44e@d2g2000yqa.googlegroups.com>

Hi

I have couple classes in the form of

class Vector:
  def __init__(self,x,y,z):
   self.x=x
   self.y=y
   self.z=z

This works fine for me. However I want to be able to provide a list,
tuple as well as individual arguments like below

myvec=Vector(1,2,3)

This works well


However I  also want to be able to do

vect=[1,2,3]

myvec=Vec(vect)

I want this class to accept multiple data types but process them as
they are same when the classs deals with the instances.

thanks




From rhodri at wildebst.demon.co.uk  Sat Mar 13 19:54:40 2010
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sun, 14 Mar 2010 00:54:40 -0000
Subject: Feeding differeent data types to a class instance?
References: <ac9a5500-6b06-4fee-b483-bab76922b44e@d2g2000yqa.googlegroups.com>
Message-ID: <op.u9i8tepma8ncjz@gnudebst>

On Sun, 14 Mar 2010 00:34:55 -0000, kuru <maymunbeyin at gmail.com> wrote:

> Hi
>
> I have couple classes in the form of
>
> class Vector:
>   def __init__(self,x,y,z):
>    self.x=x
>    self.y=y
>    self.z=z
>
> This works fine for me. However I want to be able to provide a list,
> tuple as well as individual arguments like below
>
> myvec=Vector(1,2,3)
>
> This works well
>
>
> However I  also want to be able to do
>
> vect=[1,2,3]
>
> myvec=Vec(vect)

You can do something like:

class Vector(object):
   def __init__(self, x, y=None, z=None):
     if isinstance(x, list):
       self.x = x[0]
       self.y = x[1]
       self.z = x[2]
     else:
       self.x = x
       self.y = y
       self.z = z

but this gets messy quite quickly.  The usual wisdom these days is to  
write yourself a separate class method to create your object from a  
different type:

class Vector(object):
   ... def __init__ as you did before ...

   @classmethod
   def from_list(cls, lst):
     return cls(lst[0], lst[1], lst[2])

vect = [1,2,3]
myvec = Vector.from_list(vect)


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


From monaghand.david at gmail.com  Sat Mar 13 20:00:16 2010
From: monaghand.david at gmail.com (David Monaghan)
Date: Sun, 14 Mar 2010 01:00:16 +0000
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
	<87fx443vgo.fsf@castleamber.com>
Message-ID: <lpcop5d7qgc7a4qbdqu5jf4r5da1ojkqhj@4ax.com>

On Sat, 13 Mar 2010 12:52:39 -0600, John Bokma <john at castleamber.com> wrote:

>Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
>
>> As the old proverb goes: give a man a fish, and you feed him for a day. 
>> Teach him how to fish, and he has food forever.
>
>True, but you don't teach someone fishing by poking an eye out with a
>fishing rod.
>
>> I'm an old-fashioned kind of guy, and don't like LMGTFY because it is 
>> tiresome and requires Javascript. I prefer:
>
>My reply had little to do with lmgtfy and all to do with hiding it behind
>tinyurl. But even then, why not do what you just did: give a URL to
>google directly.
>
>For quite some time I thought that comp.lang.perl.misc was quite
>unfriendly because of a certain attitude. comp.lang.python was quite a
>refreshment for a while: very newbie friendly, less pissing contests,
>etc. (but way more fanboism). 
>
>Yesterday was a sady day: I finally had to conclude that it was only
>wishful thinking on my part; there is no difference.

There was a time, when the internet was young and most newbies couldn't find
their own backsides with both hands, that your conclusions would be well
placed.That time has long passed: Newsgroups are a long way down the
hierarchy since those times and anyone turning up here nowadays _has_ heard
of Google. If they haven't used it, I don't really consider the gentle
reminder that LMGTFY gives too harsh. If you do, you're too much of a gentle
soul to be on the internet at all; someone might say "Boo" to you at any
moment. Beware.

DaveM


From usenot at geekmail.INVALID  Sat Mar 13 20:01:37 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Sun, 14 Mar 2010 02:01:37 +0100
Subject: building a dict
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
	<3f56c242-7bf5-40c6-96d4-881d052db39a@o30g2000yqb.googlegroups.com>
	<289d7e7f-a068-487e-a918-17a39110d0f7@e1g2000yqh.googlegroups.com>
	<91def698-98ba-4d63-b647-c13467e2a8c0@k17g2000yqb.googlegroups.com>
	<c40c6804-4870-4195-8766-732e10323184@e1g2000yqh.googlegroups.com>
	<0ed22def-8cb9-47ec-8df8-60439810819a@g10g2000yqh.googlegroups.com>
Message-ID: <20100314020137.2bb95011@geekmail.INVALID>

On Sat, 13 Mar 2010 13:42:12 -0800 (PST) vsoler
<vicente.soler at gmail.com> wrote:

> By the way, I suppose I am the OP. Since I am not an native English
> speaking person, I do not know what it stands for. Perhaps you can
> tell me.
> 
Perhaps you can find out yourself:

http://www.urbandictionary.com/define.php?term=op

/W


-- 
INVALID? DE!



From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 13 20:23:46 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 14 Mar 2010 01:23:46 GMT
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
	<hnfmek$o5a$1@speranza.aioe.org>
	<mailman.698.1268477864.23598.python-list@python.org>
	<hnh32u$5j6$2@speranza.aioe.org>
Message-ID: <4b9c3aa2$0$27822$c3e8da3@news.astraweb.com>

On Sun, 14 Mar 2010 11:20:15 +1300, Gib Bogle wrote:

> Mark Lawrence wrote:
>> 
>> I'm certain that members of the Guinea Pig Club might have something to
>> say on that one, see :-
>> http://en.wikipedia.org/wiki/Guinea_Pig_Club
>> 
>> 
> You mean, something like: "That's not funny"?

Or possibly "That's hilarious!!!". Gallows humour is sometimes hard to 
predict.



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 13 20:27:56 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 14 Mar 2010 01:27:56 GMT
Subject: Feeding differeent data types to a class instance?
References: <ac9a5500-6b06-4fee-b483-bab76922b44e@d2g2000yqa.googlegroups.com>
Message-ID: <4b9c3b9c$0$27822$c3e8da3@news.astraweb.com>

On Sat, 13 Mar 2010 16:34:55 -0800, kuru wrote:

> I want this class to accept multiple data types but process them as they
> are same when the classs deals with the instances.

The usual term for this is "polymorphism".

> myvec=Vector(1,2,3)
>
> vect=[1,2,3]
> myvec=Vec(vect)

I assume you mean Vector in the last line.

I find this the easiest way to handle this situation:

class Vector(object, *args):
    if len(args) == 1:
        # Assume the caller passed a list argument.
        args = args[0]
    x, y, z = args  # Unpack the arguments.
    # then process as normal.



-- 
Steven


From jgardner at jonathangardner.net  Sun Mar 14 03:42:31 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Sat, 13 Mar 2010 23:42:31 -0800
Subject: NoSQL Movement?
In-Reply-To: <7xljdx73a9.fsf@ruckus.brouhaha.com>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<mailman.256.1267655008.23598.python-list@python.org>
	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
	<6cc20cea1003120105j626cc519o2271106e088b2e90@mail.gmail.com>
	<mailman.664.1268404115.23598.python-list@python.org>
	<7xljdx73a9.fsf@ruckus.brouhaha.com>
Message-ID: <6cc20cea1003132342s6daefa43m6839a35bff37e0bb@mail.gmail.com>

On Fri, Mar 12, 2010 at 11:23 AM, Paul Rubin <no.email at nospam.invalid> wrote:
> "D'Arcy J.M. Cain" <darcy at druid.net> writes:
>> Just curious, what database were you using that wouldn't keep up with
>> you? ?I use PostgreSQL and would never consider going back to flat
>> files.
>
> Try making a file with a billion or so names and addresses, then
> compare the speed of inserting that many rows into a postgres table
> against the speed of copying the file.
>

Also consider how much work it is to partition data from flat files
versus PostgreSQL tables.

>> The only thing I can think of that might make flat files faster is
>> that flat files are buffered whereas PG guarantees that your
>> information is written to disk before returning
>
> Don't forget all the shadow page operations and the index operations,
> and that a lot of these operations require reading as well as writing
> remote parts of the disk, so buffering doesn't help avoid every disk
> seek.
>

Plus the fact that your other DB operations slow down under the load.

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From ahmeterdinc09 at gmail.com  Sun Mar 14 04:14:49 2010
From: ahmeterdinc09 at gmail.com (ahmet erdinc yilmaz)
Date: Sun, 14 Mar 2010 10:14:49 +0200
Subject: xml-rpc
Message-ID: <4B9C9AF9.80609@gmail.com>

Hello,

Recenetly we are developing a senior project and decide to use xmlrpclib.
However I have some questions. In the documentation I could not find any 
clue about
handling requests? Does the server handles each request in a separate 
thread? Or is
there some queuing mechanism for client calls? Thanks in advance.


--erdinc


From niels.ellegaard at gmail.com  Sun Mar 14 04:36:24 2010
From: niels.ellegaard at gmail.com (Niels L. Ellegaard)
Date: Sun, 14 Mar 2010 09:36:24 +0100
Subject: Some PyCon videos won't play
References: <mailman.709.1268497698.23598.python-list@python.org>
Message-ID: <877hpfwb93.fsf@langager.dbnet.dk>

Lee Harr <missive at hotmail.com> writes:

> I am having a great time watching videos from PyCon. Thanks to
> everyone who presented, and to those who did such a great job
> putting the videos up at: http://pycon.blip.tv/
>
> My trouble is that, although most of the videos play perfectly,
> there are a few that refuse to play at all. Like:

I also had problems playing some of the videos (using gnash), but if you
press "files and links", then you can download the talk as an ogv
file. Furthermore blip.tv provides an rss-feed with ogv-files for
each channel on their site.

http://pycon.blip.tv/rss

Thanks to the pycon people for putting all their nice videos on the web.

        Niels



From bieffe62 at gmail.com  Sun Mar 14 04:51:58 2010
From: bieffe62 at gmail.com (Francesco Bochicchio)
Date: Sun, 14 Mar 2010 00:51:58 -0800 (PST)
Subject: how to start a python script only once
References: <4b9bdd61$0$22515$426a74cc@news.free.fr>
Message-ID: <eb6377d5-4e8b-4d25-b392-7affb76561e4@u9g2000yqb.googlegroups.com>

On 13 Mar, 19:45, News123 <news1... at free.fr> wrote:
> Hi,
>
> I'd like to make sure, that a certain python program will only be run
> once per host. (linux/windows)
>
> so if the program is started a second time it should just terminate and
> let the other one run.
>
> This does not have to be the fastest solution, but it should be reliable.
>
> I have a few ideas, but wonder, which one is the most common
>
> My ideas so far:
>
> pid file and file locking
> --------------------------
> create a file like program.pid ?with the pid of the running program an
> use file locking to avoid race connditions.
>
> However I currently don't know how to do file locking under windows
> and I don't know how to do file lockng with python and linux.
> I'll start googling.
>
> sqlite and locking
> --------------------
> quite some time ago I used a mysql table and locking as an inter-host mutex.
>
> Perhaps sqlite would be good enough for an inter process mutex for
> processes on the same host, but I don't know it well enough.
>
> interprocess mutex
> --------------------
> well I even don't know whether something like this exists on linux / windows
>
> Thanks in advanced for any tips
>
> N

Apart from file, a portable solution would be to bind to an unused
porta and assume that finding the port busy means that your program is
already running on the port.

On recent python installations there is the multiprocessing module
which provides process-level semaphores, but I don't know how portable
they are.

Ciao
----
FB


From breamoreboy at yahoo.co.uk  Sun Mar 14 05:14:15 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Sun, 14 Mar 2010 09:14:15 +0000
Subject: python to exe
In-Reply-To: <hnh32u$5j6$2@speranza.aioe.org>
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>	<87bpes6e4l.fsf@castleamber.com>	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>	<hnfmek$o5a$1@speranza.aioe.org>	<mailman.698.1268477864.23598.python-list@python.org>
	<hnh32u$5j6$2@speranza.aioe.org>
Message-ID: <hni9d8$bu2$1@dough.gmane.org>

Gib Bogle wrote:
> Mark Lawrence wrote:
>>
>> I'm certain that members of the Guinea Pig Club might have something 
>> to say on that one, see :-
>> http://en.wikipedia.org/wiki/Guinea_Pig_Club
>>
> 
> You mean, something like: "That's not funny"?

No, simply a statement.



From breamoreboy at yahoo.co.uk  Sun Mar 14 05:33:17 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Sun, 14 Mar 2010 09:33:17 +0000
Subject: python to exe
In-Reply-To: <4b9c3aa2$0$27822$c3e8da3@news.astraweb.com>
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>	<87bpes6e4l.fsf@castleamber.com>	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>	<hnfmek$o5a$1@speranza.aioe.org>	<mailman.698.1268477864.23598.python-list@python.org>	<hnh32u$5j6$2@speranza.aioe.org>
	<4b9c3aa2$0$27822$c3e8da3@news.astraweb.com>
Message-ID: <hniagu$e2l$1@dough.gmane.org>

Steven D'Aprano wrote:
> On Sun, 14 Mar 2010 11:20:15 +1300, Gib Bogle wrote:
> 
>> Mark Lawrence wrote:
>>> I'm certain that members of the Guinea Pig Club might have something to
>>> say on that one, see :-
>>> http://en.wikipedia.org/wiki/Guinea_Pig_Club
>>>
>>>
>> You mean, something like: "That's not funny"?
> 
> Or possibly "That's hilarious!!!". Gallows humour is sometimes hard to 
> predict.
> 
> 
> 

Thinking about it can be that's not funny or hilarious depending on 
context, which is rather difficult to give on this internet/webby thingy.



From martin.hellwig at dcuktec.org  Sun Mar 14 06:17:54 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Sun, 14 Mar 2010 10:17:54 +0000
Subject: xml-rpc
In-Reply-To: <mailman.721.1268554494.23598.python-list@python.org>
References: <mailman.721.1268554494.23598.python-list@python.org>
Message-ID: <hnid4d$dk$1@news.eternal-september.org>

On 03/14/10 08:14, ahmet erdinc yilmaz wrote:
> Hello,
>
> Recenetly we are developing a senior project and decide to use xmlrpclib.
> However I have some questions. In the documentation I could not find any
> clue about
> handling requests? Does the server handles each request in a separate
> thread? Or is
> there some queuing mechanism for client calls? Thanks in advance.
>
>
> --erdinc

How I usually tackle stuff like this:
[martin at aspire8930 /usr/home/martin]$ python
Python 2.6.4 (r264:75706, Jan 31 2010, 20:52:16)
[GCC 4.2.1 20070719  [FreeBSD]] on freebsd8
Type "help", "copyright", "credits" or "license" for more information.
 >>> import SimpleXMLRPCServer
 >>> help(SimpleXMLRPCServer)
<read it and somewhere at CLASSES it says>
CLASSES
 
BaseHTTPServer.BaseHTTPRequestHandler(SocketServer.StreamRequestHandler)
         SimpleXMLRPCRequestHandler
     SimpleXMLRPCDispatcher
         CGIXMLRPCRequestHandler
         SimpleXMLRPCServer(SocketServer.TCPServer, SimpleXMLRPCDispatcher)
     SocketServer.TCPServer(SocketServer.BaseServer)
         SimpleXMLRPCServer(SocketServer.TCPServer, SimpleXMLRPCDispatcher)

Aah so it is based on SocketServer, lets have a look at that:

 >>> import SocketServer
 >>> help(SocketServer)
Help on module SocketServer:
<reading it and then it says>

     There are five classes in an inheritance diagram, four of which 
represent
     synchronous servers of four types:

             +------------+
             | BaseServer |
             +------------+
                   |
                   v
             +-----------+        +------------------+
             | TCPServer |------->| UnixStreamServer |
             +-----------+        +------------------+
                   |
                   v
             +-----------+        +--------------------+
             | UDPServer |------->| UnixDatagramServer |
             +-----------+        +--------------------+

So the base of all these servers is BaseServer, hmm somebody must have a 
laugh right now :-)

Okay lets have a look at that then:

 >>> import BaseServer
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
ImportError: No module named BaseServer

Hmmm okay, lets have a look at the SocketServer source itself then, but 
where is it?
 >>> SocketServer.__file__
'/usr/local/lib/python2.6/SocketServer.pyc'

I bet that the non compiled file is in the same directory, let's have a 
look at it with less.

 >>> quit()
[martin at aspire8930 /usr/home/martin]$ less 
/usr/local/lib/python2.6/SocketServer.py

And there it says among other interesting stuff:

     # The distinction between handling, getting, processing and
     # finishing a request is fairly arbitrary.  Remember:
     #
     # - handle_request() is the top-level call.  It calls
     #   select, get_request(), verify_request() and process_request()
     # - get_request() is different for stream or datagram sockets
     # - process_request() is the place that may fork a new process
     #   or create a new thread to finish the request
     # - finish_request() instantiates the request handler class;
     #   this constructor will handle the request all by itself

     def handle_request(self):
         """Handle one request, possibly blocking.

         Respects self.timeout.
         """
         # Support people who used socket.settimeout() to escape
         # handle_request before self.timeout was available.
         timeout = self.socket.gettimeout()
         if timeout is None:
             timeout = self.timeout
         elif self.timeout is not None:
             timeout = min(timeout, self.timeout)
         fd_sets = select.select([self], [], [], timeout)
         if not fd_sets[0]:
             self.handle_timeout()
             return
         self._handle_request_noblock()

     def _handle_request_noblock(self):
         """Handle one request, without blocking.

         I assume that select.select has returned that the socket is
         readable before this function was called, so there should be
         no risk of blocking in get_request().
         """
         try:
             request, client_address = self.get_request()
         except socket.error:
             return
         if self.verify_request(request, client_address):
             try:
                 self.process_request(request, client_address)
             except:
                 self.handle_error(request, client_address)
                 self.close_request(request)


I leave the remaining parts of your question as an exercise :-)

-- 
mph


From hackingkk at gmail.com  Sun Mar 14 06:32:30 2010
From: hackingkk at gmail.com (hackingKK)
Date: Sun, 14 Mar 2010 16:02:30 +0530
Subject: xml-rpc
In-Reply-To: <hnid4d$dk$1@news.eternal-september.org>
References: <mailman.721.1268554494.23598.python-list@python.org>
	<hnid4d$dk$1@news.eternal-september.org>
Message-ID: <4B9CBB3E.3090902@gmail.com>

Instead of using the library directly,
isn't python-twisted a better choice?

happy hacking.
Krishnakant.

On Sunday 14 March 2010 03:47 PM, Martin P. Hellwig wrote:
> On 03/14/10 08:14, ahmet erdinc yilmaz wrote:
>> Hello,
>>
>> Recenetly we are developing a senior project and decide to use 
>> xmlrpclib.
>> However I have some questions. In the documentation I could not find any
>> clue about
>> handling requests? Does the server handles each request in a separate
>> thread? Or is
>> there some queuing mechanism for client calls? Thanks in advance.
>>
>>
>> --erdinc
>
> How I usually tackle stuff like this:
> [martin at aspire8930 /usr/home/martin]$ python
> Python 2.6.4 (r264:75706, Jan 31 2010, 20:52:16)
> [GCC 4.2.1 20070719  [FreeBSD]] on freebsd8
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import SimpleXMLRPCServer
> >>> help(SimpleXMLRPCServer)
> <read it and somewhere at CLASSES it says>
> CLASSES
>
> BaseHTTPServer.BaseHTTPRequestHandler(SocketServer.StreamRequestHandler)
>         SimpleXMLRPCRequestHandler
>     SimpleXMLRPCDispatcher
>         CGIXMLRPCRequestHandler
>         SimpleXMLRPCServer(SocketServer.TCPServer, 
> SimpleXMLRPCDispatcher)
>     SocketServer.TCPServer(SocketServer.BaseServer)
>         SimpleXMLRPCServer(SocketServer.TCPServer, 
> SimpleXMLRPCDispatcher)
>
> Aah so it is based on SocketServer, lets have a look at that:
>
> >>> import SocketServer
> >>> help(SocketServer)
> Help on module SocketServer:
> <reading it and then it says>
>
>     There are five classes in an inheritance diagram, four of which 
> represent
>     synchronous servers of four types:
>
>             +------------+
>             | BaseServer |
>             +------------+
>                   |
>                   v
>             +-----------+        +------------------+
>             | TCPServer |------->| UnixStreamServer |
>             +-----------+        +------------------+
>                   |
>                   v
>             +-----------+        +--------------------+
>             | UDPServer |------->| UnixDatagramServer |
>             +-----------+        +--------------------+
>
> So the base of all these servers is BaseServer, hmm somebody must have 
> a laugh right now :-)
>
> Okay lets have a look at that then:
>
> >>> import BaseServer
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> ImportError: No module named BaseServer
>
> Hmmm okay, lets have a look at the SocketServer source itself then, 
> but where is it?
> >>> SocketServer.__file__
> '/usr/local/lib/python2.6/SocketServer.pyc'
>
> I bet that the non compiled file is in the same directory, let's have 
> a look at it with less.
>
> >>> quit()
> [martin at aspire8930 /usr/home/martin]$ less 
> /usr/local/lib/python2.6/SocketServer.py
>
> And there it says among other interesting stuff:
>
>     # The distinction between handling, getting, processing and
>     # finishing a request is fairly arbitrary.  Remember:
>     #
>     # - handle_request() is the top-level call.  It calls
>     #   select, get_request(), verify_request() and process_request()
>     # - get_request() is different for stream or datagram sockets
>     # - process_request() is the place that may fork a new process
>     #   or create a new thread to finish the request
>     # - finish_request() instantiates the request handler class;
>     #   this constructor will handle the request all by itself
>
>     def handle_request(self):
>         """Handle one request, possibly blocking.
>
>         Respects self.timeout.
>         """
>         # Support people who used socket.settimeout() to escape
>         # handle_request before self.timeout was available.
>         timeout = self.socket.gettimeout()
>         if timeout is None:
>             timeout = self.timeout
>         elif self.timeout is not None:
>             timeout = min(timeout, self.timeout)
>         fd_sets = select.select([self], [], [], timeout)
>         if not fd_sets[0]:
>             self.handle_timeout()
>             return
>         self._handle_request_noblock()
>
>     def _handle_request_noblock(self):
>         """Handle one request, without blocking.
>
>         I assume that select.select has returned that the socket is
>         readable before this function was called, so there should be
>         no risk of blocking in get_request().
>         """
>         try:
>             request, client_address = self.get_request()
>         except socket.error:
>             return
>         if self.verify_request(request, client_address):
>             try:
>                 self.process_request(request, client_address)
>             except:
>                 self.handle_error(request, client_address)
>                 self.close_request(request)
>
>
> I leave the remaining parts of your question as an exercise :-)
>



From fetchinson at googlemail.com  Sun Mar 14 06:49:08 2010
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Sun, 14 Mar 2010 11:49:08 +0100
Subject: how to start a python script only once
In-Reply-To: <4b9bdd61$0$22515$426a74cc@news.free.fr>
References: <4b9bdd61$0$22515$426a74cc@news.free.fr>
Message-ID: <fbe2e2101003140349o1ba3de2bi6c671d340a27ea42@mail.gmail.com>

> I'd like to make sure, that a certain python program will only be run
> once per host. (linux/windows)
>
>
> so if the program is started a second time it should just terminate and
> let the other one run.
>
> This does not have to be the fastest solution, but it should be reliable.
>
>
> I have a few ideas, but wonder, which one is the most common
>
>
> My ideas so far:
>
> pid file and file locking
> --------------------------
> create a file like program.pid  with the pid of the running program an
> use file locking to avoid race connditions.
>
> However I currently don't know how to do file locking under windows
> and I don't know how to do file lockng with python and linux.
> I'll start googling.

This is the variant I'm using frequently too and I'd recommend to you as well.
Simple to implement and largely problem-free.

Cheers,
Daniel


-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From martin.hellwig at dcuktec.org  Sun Mar 14 06:50:21 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Sun, 14 Mar 2010 10:50:21 +0000
Subject: xml-rpc
In-Reply-To: <mailman.724.1268562769.23598.python-list@python.org>
References: <mailman.721.1268554494.23598.python-list@python.org>	<hnid4d$dk$1@news.eternal-september.org>
	<mailman.724.1268562769.23598.python-list@python.org>
Message-ID: <hnif17$93u$1@news.eternal-september.org>

On 03/14/10 10:32, hackingKK wrote:
> Instead of using the library directly,
> isn't python-twisted a better choice?
<cut>
Why?

-- 
mph


From spamfresser at ch3ka.de  Sun Mar 14 07:25:35 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Sun, 14 Mar 2010 12:25:35 +0100
Subject: I passed a fizzbuzz test but failed at recursion.
In-Reply-To: <2380120f-c273-4179-af80-ecc8954a6bd3@b7g2000yqd.googlegroups.com>
References: <2380120f-c273-4179-af80-ecc8954a6bd3@b7g2000yqd.googlegroups.com>
Message-ID: <hnih3e$jc2$1@news.urz.uni-heidelberg.de>

Am 10.03.2010 16:55, schrieb Bill:
> def fizzbuzz(num):
>      if num:
>          if num % 15 is 0: return fizzbuzz(num-1) + 'fizzbuzz \n'
>          elif num % 5 is 0: return fizzbuzz(num-1) + 'buzz \n'
>          elif num % 3 is 0: return fizzbuzz(num-1) + 'fizz \n'
>          else : return fizzbuzz(num-1) + ('%d \n' % num)
>      return ''
> print fizzbuzz(100)

While I do understand that this is not a Perl group, and this probably 
won't help the OP, I just could not resist:

for i in range(1,101):print('','fizz')[not i%3]+('','buzz')[not i%5]or i

 > However, when I try to decipher the logic of the function I imagine
 > the solution reversed as "buzz fizz 98 97 ...etc... 4 fizz 2 1".

No, the function creates the string from right to left.
See:
fizzbuzz(100) = fizzbuzz(99) + "buzz \n"
= fizzbuzz(98) + "fizz \n" + "buzz \n"

...

= fizzbuzz(1) + "2 \n" + "fizz \n" + "4 \n" + "buzz\n " + "fizz \n" + 
.... + "97 \n" + "98 \n" + "fizz \n" + "buzz \n"

= fizzbuzz(0) + "1 \n" + "2 \n" + "fizz \n" + "4 \n" + "buzz\n " + "fizz 
\n" + .... + "97 \n" + "98 \n" + "fizz \n" + "buzz \n"

= " " + "1 \n" + "2 \n" + "fizz \n" + "4 \n" + "buzz\n " + "fizz \n" + 
.... + "97 \n" + "98 \n" + "fizz \n" + "buzz \n"

Regards,
Michael


From vicente.soler at gmail.com  Sun Mar 14 07:34:53 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sun, 14 Mar 2010 04:34:53 -0700 (PDT)
Subject: "Breaking" the __main__ script
Message-ID: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com>

Hello,

I am still learning python, thus developnig small scripts.

Some of them consist only of the main module. While testing them
(debugging) I sometimes want to stop the script at a certain point,
with something like    stop, break, end   or something similar.

What statement can I use?

Vicente Soler


From breamoreboy at yahoo.co.uk  Sun Mar 14 07:53:22 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Sun, 14 Mar 2010 11:53:22 +0000
Subject: "Breaking" the __main__ script
In-Reply-To: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com>
Message-ID: <hniine$79f$1@dough.gmane.org>

vsoler wrote:
> Hello,
> 
> I am still learning python, thus developnig small scripts.
> 
> Some of them consist only of the main module. While testing them
> (debugging) I sometimes want to stop the script at a certain point,
> with something like    stop, break, end   or something similar.
> 
> What statement can I use?
> 
> Vicente Soler

Something like
import sys
sys.exit()?

HTH.

Mark Lawrence



From h.stenstrom at gmail.com  Sun Mar 14 07:58:07 2010
From: h.stenstrom at gmail.com (=?ISO-8859-1?Q?Helge_Stenstr=F6m?=)
Date: Sun, 14 Mar 2010 04:58:07 -0700 (PDT)
Subject: Function that knows its argument's variable name
Message-ID: <47e725b6-1470-4563-a64b-02630032ef36@g26g2000yqn.googlegroups.com>

I want to write  function that prints a value of a variable, for
debugging. Like:

with

myVariable = "parrot"
otherVariable = "dead"

probe(myVariable)
probe(otherVariable)

instead of the longer

print "myVariable = ", myVariable
print "otherVariable = ", otherVariable

Is that even possible?

The function would look like

def probe(var):
    nameOfVar = someMagic(var)
    print nameOfVar, " = ", var

but can someMagic(var) find the variable name? Is that possible?


From spamfresser at ch3ka.de  Sun Mar 14 08:20:03 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Sun, 14 Mar 2010 13:20:03 +0100
Subject: "Breaking" the __main__ script
In-Reply-To: <mailman.726.1268567615.23598.python-list@python.org>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com>
	<mailman.726.1268567615.23598.python-list@python.org>
Message-ID: <hnik9k$ju1$1@news.urz.uni-heidelberg.de>

Am 14.03.2010 12:53, schrieb Mark Lawrence:
> vsoler wrote:
>> I sometimes want to stop the script at a certain point,
>> with something like stop, break, end or something similar.
>> What statement can I use?
> Something like
> import sys
> sys.exit()?

Or just "raise SystemExit", "raise SyntaxError" or any other Exception.
But you won't have to: If you use IDLE, you can just set breakpoints in 
your code: enable the debugger in debug-debugger and set breakpoints via 
right click in your source file.

Or you could use a real debugger, like pdb
http://docs.python.org/library/pdb.html

HTH,
Michael


From steve at holdenweb.com  Sun Mar 14 08:36:55 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 14 Mar 2010 08:36:55 -0400
Subject: building a dict
In-Reply-To: <20100314020137.2bb95011@geekmail.INVALID>
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>	<3f56c242-7bf5-40c6-96d4-881d052db39a@o30g2000yqb.googlegroups.com>	<289d7e7f-a068-487e-a918-17a39110d0f7@e1g2000yqh.googlegroups.com>	<91def698-98ba-4d63-b647-c13467e2a8c0@k17g2000yqb.googlegroups.com>	<c40c6804-4870-4195-8766-732e10323184@e1g2000yqh.googlegroups.com>	<0ed22def-8cb9-47ec-8df8-60439810819a@g10g2000yqh.googlegroups.com>
	<20100314020137.2bb95011@geekmail.INVALID>
Message-ID: <hnilao$f86$1@dough.gmane.org>

Andreas Waldenburger wrote:
> On Sat, 13 Mar 2010 13:42:12 -0800 (PST) vsoler
> <vicente.soler at gmail.com> wrote:
> 
>> By the way, I suppose I am the OP. Since I am not an native English
>> speaking person, I do not know what it stands for. Perhaps you can
>> tell me.
>>
> Perhaps you can find out yourself:
> 
> http://www.urbandictionary.com/define.php?term=op
> 
Possibly so, and that's a useful site, but I hope you aren't suggesting
that Vicente shouldn't have asked. It seemed like a perfectly acceptable
question to me.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Sun Mar 14 09:03:53 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 14 Mar 2010 09:03:53 -0400
Subject: Feeding differeent data types to a class instance?
In-Reply-To: <ac9a5500-6b06-4fee-b483-bab76922b44e@d2g2000yqa.googlegroups.com>
References: <ac9a5500-6b06-4fee-b483-bab76922b44e@d2g2000yqa.googlegroups.com>
Message-ID: <hnimtb$kiq$1@dough.gmane.org>

kuru wrote:
> Hi
> 
> I have couple classes in the form of
> 
> class Vector:
>   def __init__(self,x,y,z):
>    self.x=x
>    self.y=y
>    self.z=z
> 
> This works fine for me. However I want to be able to provide a list,
> tuple as well as individual arguments like below
> 
> myvec=Vector(1,2,3)
> 
> This works well
> 
> 
> However I  also want to be able to do
> 
> vect=[1,2,3]
> 
> myvec=Vec(vect)
> 
> I want this class to accept multiple data types but process them as
> they are same when the classs deals with the instances.
> 
> thanks
> 
> 
With your existing class you can use Python's ability to transform a
list or tuple into individual arguments using the * notation:

>>> class Vector:
...   def __init__(self,x,y,z):
...    self.x=x
...    self.y=y
...    self.z=z
...
>>> vl = [1, 2, 3]
>>> v = Vector(*vl)
>>> v.x
1
>>> v.y
2
>>> v.z
3
>>>

Will this do? It seems much simpler than rewriting an already
satisfactory class.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Sun Mar 14 09:07:21 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 14 Mar 2010 09:07:21 -0400
Subject: "Breaking" the __main__ script
In-Reply-To: <hniine$79f$1@dough.gmane.org>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com>
	<hniine$79f$1@dough.gmane.org>
Message-ID: <hnin3r$kiq$2@dough.gmane.org>

Mark Lawrence wrote:
> vsoler wrote:
>> Hello,
>>
>> I am still learning python, thus developnig small scripts.
>>
>> Some of them consist only of the main module. While testing them
>> (debugging) I sometimes want to stop the script at a certain point,
>> with something like    stop, break, end   or something similar.
>>
>> What statement can I use?
>>
>> Vicente Soler
> 
> Something like
> import sys
> sys.exit()?
> 
> HTH.

I think it's less than likely that it will help, since once sys.exit()
is called the program is no longer available for inspection.

The OP is probably looking for the "pdb" module in the standard library.
The documentation is good enough to get you started.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From usenot at geekmail.INVALID  Sun Mar 14 09:28:09 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Sun, 14 Mar 2010 14:28:09 +0100
Subject: building a dict
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
	<3f56c242-7bf5-40c6-96d4-881d052db39a@o30g2000yqb.googlegroups.com>
	<289d7e7f-a068-487e-a918-17a39110d0f7@e1g2000yqh.googlegroups.com>
	<91def698-98ba-4d63-b647-c13467e2a8c0@k17g2000yqb.googlegroups.com>
	<c40c6804-4870-4195-8766-732e10323184@e1g2000yqh.googlegroups.com>
	<0ed22def-8cb9-47ec-8df8-60439810819a@g10g2000yqh.googlegroups.com>
	<20100314020137.2bb95011@geekmail.INVALID>
	<mailman.727.1268570289.23598.python-list@python.org>
Message-ID: <20100314142809.5c456262@geekmail.INVALID>

On Sun, 14 Mar 2010 08:36:55 -0400 Steve Holden <steve at holdenweb.com>
wrote:

> Andreas Waldenburger wrote:
> > On Sat, 13 Mar 2010 13:42:12 -0800 (PST) vsoler
> > <vicente.soler at gmail.com> wrote:
> > 
> >> By the way, I suppose I am the OP. Since I am not an native English
> >> speaking person, I do not know what it stands for. Perhaps you can
> >> tell me.
> >>
> > Perhaps you can find out yourself:
> > 
> > http://www.urbandictionary.com/define.php?term=op
> > 
> Possibly so, and that's a useful site, but I hope you aren't
> suggesting that Vicente shouldn't have asked. It seemed like a
> perfectly acceptable question to me.
> 
I was a bit trigger happy there, I admit. But with vocabulary questions
like these, my first reflex is to ask the web rather than people,
because it's usually quicker than Usenet (albeit often only by a minute
or so). I somehow felt the need to bestow that bit of "wisdom" on the
world.

But yeah, the question is fine, of course.

/W

-- 
INVALID? DE!



From darcy at druid.net  Sun Mar 14 09:55:13 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Sun, 14 Mar 2010 09:55:13 -0400
Subject: NoSQL Movement?
In-Reply-To: <6cc20cea1003132342s6daefa43m6839a35bff37e0bb@mail.gmail.com>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<mailman.256.1267655008.23598.python-list@python.org>
	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
	<6cc20cea1003120105j626cc519o2271106e088b2e90@mail.gmail.com>
	<mailman.664.1268404115.23598.python-list@python.org>
	<7xljdx73a9.fsf@ruckus.brouhaha.com>
	<6cc20cea1003132342s6daefa43m6839a35bff37e0bb@mail.gmail.com>
Message-ID: <20100314095513.61b0fbaa.darcy@druid.net>

On Sat, 13 Mar 2010 23:42:31 -0800
Jonathan Gardner <jgardner at jonathangardner.net> wrote:
> On Fri, Mar 12, 2010 at 11:23 AM, Paul Rubin <no.email at nospam.invalid> wrote:
> > "D'Arcy J.M. Cain" <darcy at druid.net> writes:
> >> Just curious, what database were you using that wouldn't keep up with
> >> you? ?I use PostgreSQL and would never consider going back to flat
> >> files.
> >
> > Try making a file with a billion or so names and addresses, then
> > compare the speed of inserting that many rows into a postgres table
> > against the speed of copying the file.

That's a straw man argument.  Copying an already built database to
another copy of the database won't be significantly longer than copying
an already built file.  In fact, it's the same operation.

> Also consider how much work it is to partition data from flat files
> versus PostgreSQL tables.

Another straw man.  I'm sure you can come up with many contrived
examples to show one particular operation faster than another.
Benchmark writers (bad ones) do it all the time.  I'm saying that in
normal, real world situations where you are collecting billions of data
points and need to actually use the data that a properly designed
database running on a good database engine will generally be better than
using flat files.

> >> The only thing I can think of that might make flat files faster is
> >> that flat files are buffered whereas PG guarantees that your
> >> information is written to disk before returning
> >
> > Don't forget all the shadow page operations and the index operations,
> > and that a lot of these operations require reading as well as writing
> > remote parts of the disk, so buffering doesn't help avoid every disk
> > seek.

Not sure what a "shadow page operation" is but index operations are
only needed if you have to have fast access to read back the data.  If
it doesn't matter how long it takes to read the data back then don't
index it.  I have a hard time believing that anyone would want to save
billions of data points and not care how fast they can read selected
parts back or organize the data though.

> Plus the fact that your other DB operations slow down under the load.

Not with the database engines that I use.  Sure, speed and load are
connected whether you use databases or flat files but a proper database
will scale up quite well.

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


From gatoygata2 at gmail.com  Sun Mar 14 10:03:29 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Sun, 14 Mar 2010 07:03:29 -0700 (PDT)
Subject: "Breaking" the __main__ script
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com>
Message-ID: <c1e07a17-b661-4e1a-9dc2-ebbd149d4963@e1g2000yqh.googlegroups.com>

On 14 mar, 12:34, vsoler <vicente.so... at gmail.com> wrote:
> Hello,
>
> I am still learning python, thus developnig small scripts.
>
> Some of them consist only of the main module. While testing them
> (debugging) I sometimes want to stop the script at a certain point,
> with something like ? ?stop, break, end ? or something similar.
>
> What statement can I use?
>
> Vicente Soler

Hola Vicente,

You need a debugger.
A practical solution to start with is to use an IDE with an integrated
debugger.
Stani's Python Editor (SPE) is a lightweight IDE with pdb integrated
(with style checker also).
It is a very good ide for learning (simple and not cluttered) but also
for medium size
applications (it is very well designed).

atb

Joaquin


From steve at holdenweb.com  Sun Mar 14 10:16:43 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 14 Mar 2010 10:16:43 -0400
Subject: NoSQL Movement?
In-Reply-To: <20100314095513.61b0fbaa.darcy@druid.net>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>	<mailman.256.1267655008.23598.python-list@python.org>	<BABjn.11012$pv.4575@news-server.bigpond.net.au>	<6cc20cea1003120105j626cc519o2271106e088b2e90@mail.gmail.com>	<mailman.664.1268404115.23598.python-list@python.org>	<7xljdx73a9.fsf@ruckus.brouhaha.com>	<6cc20cea1003132342s6daefa43m6839a35bff37e0bb@mail.gmail.com>
	<20100314095513.61b0fbaa.darcy@druid.net>
Message-ID: <hnir5u$3og$1@dough.gmane.org>

D'Arcy J.M. Cain wrote:
> On Sat, 13 Mar 2010 23:42:31 -0800
> Jonathan Gardner <jgardner at jonathangardner.net> wrote:
>> On Fri, Mar 12, 2010 at 11:23 AM, Paul Rubin <no.email at nospam.invalid> wrote:
>>> "D'Arcy J.M. Cain" <darcy at druid.net> writes:
>>>> Just curious, what database were you using that wouldn't keep up with
>>>> you?  I use PostgreSQL and would never consider going back to flat
>>>> files.
>>> Try making a file with a billion or so names and addresses, then
>>> compare the speed of inserting that many rows into a postgres table
>>> against the speed of copying the file.
> 
> That's a straw man argument.  Copying an already built database to
> another copy of the database won't be significantly longer than copying
> an already built file.  In fact, it's the same operation.
> 
>> Also consider how much work it is to partition data from flat files
>> versus PostgreSQL tables.
> 
> Another straw man.  I'm sure you can come up with many contrived
> examples to show one particular operation faster than another.
> Benchmark writers (bad ones) do it all the time.  I'm saying that in
> normal, real world situations where you are collecting billions of data
> points and need to actually use the data that a properly designed
> database running on a good database engine will generally be better than
> using flat files.
> 
>>>> The only thing I can think of that might make flat files faster is
>>>> that flat files are buffered whereas PG guarantees that your
>>>> information is written to disk before returning
>>> Don't forget all the shadow page operations and the index operations,
>>> and that a lot of these operations require reading as well as writing
>>> remote parts of the disk, so buffering doesn't help avoid every disk
>>> seek.
> 
> Not sure what a "shadow page operation" is but index operations are
> only needed if you have to have fast access to read back the data.  If
> it doesn't matter how long it takes to read the data back then don't
> index it.  I have a hard time believing that anyone would want to save
> billions of data points and not care how fast they can read selected
> parts back or organize the data though.
> 
>> Plus the fact that your other DB operations slow down under the load.
> 
> Not with the database engines that I use.  Sure, speed and load are
> connected whether you use databases or flat files but a proper database
> will scale up quite well.
> 
A common complaint about large database loads taking a long time comes
about because of trying to commit the whole change as a single
transaction. Such an approach can indeed causes stresses on the database
system, but aren't usually necessary.

I don't know about PostgreSQL's capabilities in this area but I do know
that Oracle (which claims to be all about performance, though in fact I
believe PostgreSQL is its equal in many applications) allows you to
switch off the various time-consuming features such as transaction
logging in order to make bulk updates faster.

I also question how many databases would actually find a need to store
addresses for a sixth of the world's population, but this objection is
made mostly for comic relief: I understand that tables of such a size
are necessary sometimes.

There was a talk at OSCON two years ago by someone who was using
PostgreSQL to process 15 terabytes of medical data. I'm sure he'd have
been interested in suggestions that flat files were the answer to his
problem ...

Another talk a couple of years before that discussed how PostgreSQL was
superior to Oracle in handling a three-terabyte data warehouse (though
it conceded Oracle's superiority in handling the production OLTP system
on which the warehouse was based - but that's four years ago).

  http://images.omniti.net/omniti.com/~jesus/misc/BBPostgres.pdf

Of course if you only need sequential access to the data then the
relational approach may be overkill. I would never argue that relational
is the best approach for all data and all applications, but it's often
better than its less-informed critics realize.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From news1234 at free.fr  Sun Mar 14 10:30:13 2010
From: news1234 at free.fr (News123)
Date: Sun, 14 Mar 2010 15:30:13 +0100
Subject: how to start a python script only once
In-Reply-To: <eb6377d5-4e8b-4d25-b392-7affb76561e4@u9g2000yqb.googlegroups.com>
References: <4b9bdd61$0$22515$426a74cc@news.free.fr>
	<eb6377d5-4e8b-4d25-b392-7affb76561e4@u9g2000yqb.googlegroups.com>
Message-ID: <4b9cf2f5$0$27865$426a34cc@news.free.fr>

Hi Francesco,

Francesco Bochicchio wrote:
> On 13 Mar, 19:45, News123 <news1... at free.fr> wrote:
>> Hi,
>>
>> I'd like to make sure, that a certain python program will only be run
>> once per host. (linux/windows)
>>
>> so if the program is started a second time it should just terminate and
>> let the other one run.
>>
>> This does not have to be the fastest solution, but it should be reliable.
>>
>> I have a few ideas, but wonder, which one is the most common
>>
>> My ideas so far:
>>
>> pid file and file locking
>> --------------------------
>> create a file like program.pid  with the pid of the running program an
>> use file locking to avoid race connditions.
>>
>> However I currently don't know how to do file locking under windows
>> and I don't know how to do file lockng with python and linux.
>> I'll start googling.
>>
>> sqlite and locking
>> --------------------
>> quite some time ago I used a mysql table and locking as an inter-host mutex.
>>
>> Perhaps sqlite would be good enough for an inter process mutex for
>> processes on the same host, but I don't know it well enough.
>>
>> interprocess mutex
>> --------------------
>> well I even don't know whether something like this exists on linux / windows
>>
>> Thanks in advanced for any tips
>>
>> N
> 
> Apart from file, a portable solution would be to bind to an unused
> porta and assume that finding the port busy means that your program is
> already running on the port.
Yes, this should work.
I assume in this case the bind() function would handle the race condition.
> 
> On recent python installations there is the multiprocessing module
> which provides process-level semaphores, but I don't know how portable
> they are.

Yes, there are process level semaphores in multiprocesing, but if I
understood well, they would either require a common parent process or
one process, which were acting as a manager, but then the question would
be how to make sure, that the manager process were started only once. (
bind port? )


From news1234 at free.fr  Sun Mar 14 10:32:09 2010
From: news1234 at free.fr (News123)
Date: Sun, 14 Mar 2010 15:32:09 +0100
Subject: how to start a python script only once
In-Reply-To: <mailman.725.1268563752.23598.python-list@python.org>
References: <4b9bdd61$0$22515$426a74cc@news.free.fr>
	<mailman.725.1268563752.23598.python-list@python.org>
Message-ID: <4b9cf369$0$27865$426a34cc@news.free.fr>

Hi Daniel,

Daniel Fetchinson wrote:
>> I'd like to make sure, that a certain python program will only be run
>> once per host. (linux/windows)
>>
>>
>> so if the program is started a second time it should just terminate and
>> let the other one run.
>>
>> This does not have to be the fastest solution, but it should be reliable.
>>
>>
>> I have a few ideas, but wonder, which one is the most common
>>
>>
>> My ideas so far:
>>
>> pid file and file locking
>> --------------------------
>> create a file like program.pid  with the pid of the running program an
>> use file locking to avoid race connditions.
>>
>> However I currently don't know how to do file locking under windows
>> and I don't know how to do file lockng with python and linux.
>> I'll start googling.
> 
> This is the variant I'm using frequently too and I'd recommend to you as well.
> Simple to implement and largely problem-free.

OK, So I'll just have to look in a piece of code, that performs file
locking for windows AND for linux and I should be fine.

bye

N


From darcy at druid.net  Sun Mar 14 10:48:10 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Sun, 14 Mar 2010 10:48:10 -0400
Subject: NoSQL Movement?
In-Reply-To: <hnir5u$3og$1@dough.gmane.org>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<mailman.256.1267655008.23598.python-list@python.org>
	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
	<6cc20cea1003120105j626cc519o2271106e088b2e90@mail.gmail.com>
	<mailman.664.1268404115.23598.python-list@python.org>
	<7xljdx73a9.fsf@ruckus.brouhaha.com>
	<6cc20cea1003132342s6daefa43m6839a35bff37e0bb@mail.gmail.com>
	<20100314095513.61b0fbaa.darcy@druid.net>
	<hnir5u$3og$1@dough.gmane.org>
Message-ID: <20100314104810.adc0c61a.darcy@druid.net>

On Sun, 14 Mar 2010 10:16:43 -0400
Steve Holden <steve at holdenweb.com> wrote:
> A common complaint about large database loads taking a long time comes
> about because of trying to commit the whole change as a single
> transaction. Such an approach can indeed causes stresses on the database
> system, but aren't usually necessary.

True.

> I don't know about PostgreSQL's capabilities in this area but I do know
> that Oracle (which claims to be all about performance, though in fact I
> believe PostgreSQL is its equal in many applications) allows you to
> switch off the various time-consuming features such as transaction
> logging in order to make bulk updates faster.

Yes, PostgreSQL has a bulk loading option as well.  It's usually useful
when you are copying data from one database into another and need to do
it quickly.

> I also question how many databases would actually find a need to store
> addresses for a sixth of the world's population, but this objection is
> made mostly for comic relief: I understand that tables of such a size
> are necessary sometimes.

How about Microsoft storing it's user base?  Oh wait, they only store
registered users with legitimate copies.  Never mind.

> Of course if you only need sequential access to the data then the
> relational approach may be overkill. I would never argue that relational
> is the best approach for all data and all applications, but it's often
> better than its less-informed critics realize.

As a rule I find that in the real world the larger the dataset the
more likely you need a proper database.  For smaller datasets it
doesn't matter so why not use a DB anyway and be prepared when that
"throwaway" system suddenly becomes your company's core application.

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


From news1234 at free.fr  Sun Mar 14 10:52:06 2010
From: news1234 at free.fr (News123)
Date: Sun, 14 Mar 2010 15:52:06 +0100
Subject: NoSQL Movement?
In-Reply-To: <Xns9D35C3BFCE829duncanbooth@127.0.0.1>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<4b90a1f8$0$1629$742ec2ed@news.sonic.net>
	<0d381135-730a-45e4-9225-9ba2a29b77fe@k2g2000pro.googlegroups.com>
	<Xns9D35C3BFCE829duncanbooth@127.0.0.1>
Message-ID: <4b9cf816$0$20651$426a74cc@news.free.fr>

Hi DUncan,


Duncan Booth wrote:
> Xah Lee <xahlee at gmail.com> wrote:
> 
>> For example, consider, if you are within world's top 100th user of
>> database in terms of database size, such as Google, then it may be
>> that the off-the-shelf tools may be limiting. But how many users
>> really have such massive size of data?
> 
> You've totally missed the point. It isn't the size of the data you have 
> today that matters, it's the size of data you could have in several years' 
> time.
> 
> Maybe today you've got 10 users each with 10 megabytes of data, but you're 
> aspiring to become the next twitter/facebook or whatever. It's a bit late 
> as you approach 100 million users (and a petabyte of data) to discover that 
> your system isn't scalable: scalability needs to be built in from day one.


any project/product has to adapt over time.


Not using SQL just because your 20 user application with 100 data sets
might grow into the worlds biggest database doesn't seem right to me.


I strongly believe in not overengineering a product.

For anything I do I use the most covnenient python library first.
This allows me to have results quicky and to get feedback about the
product ASAP.

Lateron I switch to the more performant versions.


bye


N


From python at bdurham.com  Sun Mar 14 11:03:47 2010
From: python at bdurham.com (python at bdurham.com)
Date: Sun, 14 Mar 2010 11:03:47 -0400
Subject: "Breaking" the __main__ script
In-Reply-To: <hnik9k$ju1$1@news.urz.uni-heidelberg.de>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com><mailman.726.1268567615.23598.python-list@python.org>
	<hnik9k$ju1$1@news.urz.uni-heidelberg.de>
Message-ID: <1268579027.18252.1364740493@webmail.messagingengine.com>

Michael,

> Or you could use a real debugger, like pdb
> http://docs.python.org/library/pdb.html

Any reason you prefer PDB over WinPDB?
http://winpdb.org/

Thanks,
Malcolm


From news1234 at free.fr  Sun Mar 14 11:04:25 2010
From: news1234 at free.fr (News123)
Date: Sun, 14 Mar 2010 16:04:25 +0100
Subject: how to start a python script only once
In-Reply-To: <mailman.725.1268563752.23598.python-list@python.org>
References: <4b9bdd61$0$22515$426a74cc@news.free.fr>
	<mailman.725.1268563752.23598.python-list@python.org>
Message-ID: <4B9CFAF9.1070802@free.fr>

Hi Daniel,


One more question:


Daniel Fetchinson wrote:
>> I'd like to make sure, that a certain python program will only be run
>> once per host. (linux/windows)
>>
>>
>> so if the program is started a second time it should just terminate and
>> let the other one run.
>>
>> This does not have to be the fastest solution, but it should be reliable.
>>
>>
>> I have a few ideas, but wonder, which one is the most common
>>
>>
>> My ideas so far:
>>
>> pid file and file locking
>> --------------------------
>> create a file like program.pid  with the pid of the running program an
>> use file locking to avoid race connditions.
>>
>> However I currently don't know how to do file locking under windows
>> and I don't know how to do file lockng with python and linux.
>> I'll start googling.
> 
> This is the variant I'm using frequently too and I'd recommend to you as well.
> Simple to implement and largely problem-free.
> 
How do you make sure, that pid which is stored in the pid file does
really belong to the correct process and not just to any process, that
has by coincidence the same pid?


bye

N


From news1234 at free.fr  Sun Mar 14 11:04:25 2010
From: news1234 at free.fr (News123)
Date: Sun, 14 Mar 2010 16:04:25 +0100
Subject: how to start a python script only once
In-Reply-To: <mailman.725.1268563752.23598.python-list@python.org>
References: <4b9bdd61$0$22515$426a74cc@news.free.fr>
	<mailman.725.1268563752.23598.python-list@python.org>
Message-ID: <4B9CFAF9.1070802@free.fr>

Hi Daniel,


One more question:


Daniel Fetchinson wrote:
>> I'd like to make sure, that a certain python program will only be run
>> once per host. (linux/windows)
>>
>>
>> so if the program is started a second time it should just terminate and
>> let the other one run.
>>
>> This does not have to be the fastest solution, but it should be reliable.
>>
>>
>> I have a few ideas, but wonder, which one is the most common
>>
>>
>> My ideas so far:
>>
>> pid file and file locking
>> --------------------------
>> create a file like program.pid  with the pid of the running program an
>> use file locking to avoid race connditions.
>>
>> However I currently don't know how to do file locking under windows
>> and I don't know how to do file lockng with python and linux.
>> I'll start googling.
> 
> This is the variant I'm using frequently too and I'd recommend to you as well.
> Simple to implement and largely problem-free.
> 
How do you make sure, that pid which is stored in the pid file does
really belong to the correct process and not just to any process, that
has by coincidence the same pid?


bye

N


From david at boddie.org.uk  Sun Mar 14 11:14:27 2010
From: david at boddie.org.uk (David Boddie)
Date: Sun, 14 Mar 2010 16:14:27 +0100
Subject: Some PyCon videos won't play
References: <SNT106-W28E9678F29E5527CFCBB88B1300@phx.gbl>
	<mailman.716.1268506909.23598.python-list@python.org>
Message-ID: <hniugj$b36$1@get-news01.get.basefarm.net>

On Saturday 13 March 2010 20:01, Terry Reedy wrote:

> On 3/13/2010 11:23 AM, Lee Harr wrote:
>>
>> I am having a great time watching videos from PyCon. Thanks to
>> everyone who presented, and to those who did such a great job
>> putting the videos up at: http://pycon.blip.tv/
>>
>> My trouble is that, although most of the videos play perfectly,
>> there are a few that refuse to play at all. Like:

[...]

>> Is anyone else having trouble with these?
> 
> Yes, 'spinner' spins indefinitely, while others load and play.

You should still be able to get at the videos themselves by inspecting
the page contents, looking for download links like this one:

http://blip.tv/file/get/Pycon-PyCon2010UsingPythonToCreateRoboticSimulationsForPlaneta894.ogv

In this case, it's an Ogg Theora video file, so you may want to use
a player like VLC to view it:

http://www.videolan.org/

David


From wolfgang.lipp at gmail.com  Sun Mar 14 11:57:36 2010
From: wolfgang.lipp at gmail.com (_wolf)
Date: Sun, 14 Mar 2010 08:57:36 -0700 (PDT)
Subject: Is it possible to use re2 from Python?
Message-ID: <f853ea28-b236-4a17-8ded-43e5fe455d47@a18g2000yqc.googlegroups.com>


i just discovered http://code.google.com/p/re2, a promising library
that uses a long-neglected way (Thompson NFA) to implement a regular
expression engine that can be orders of magnitudes faster than the
available engines of awk, Perl, or Python.

so i downloaded the code and did the usual sudo make install thing.
however, that action had seemingly done little more than adding /usr/
local/include/re2/re2.h to my system. there seemed to be some `*.a
file in addition, but then what is it with this *.a extension?

i would like to use re2 from Python (preferrably Python 3.1) and was
excited to see files like make_unicode_groups.py in the distro (maybe
just used during the build process?). those however were not deployed
on my machine.

how can i use re2 from Python?

(this message appeared before under
http://stackoverflow.com/questions/2439345/is-it-possible-to-use-re2-from-python
and, even earlier, http://groups.google.com/group/re2-dev/t/59b78327ec3cca0a)


From gherron at islandtraining.com  Sun Mar 14 12:45:51 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Sun, 14 Mar 2010 09:45:51 -0700
Subject: Function that knows its argument's variable name
In-Reply-To: <47e725b6-1470-4563-a64b-02630032ef36@g26g2000yqn.googlegroups.com>
References: <47e725b6-1470-4563-a64b-02630032ef36@g26g2000yqn.googlegroups.com>
Message-ID: <4B9D12BF.70307@islandtraining.com>

Helge Stenstr?m wrote:
> I want to write  function that prints a value of a variable, for
> debugging. Like:
>
> with
>
> myVariable = "parrot"
> otherVariable = "dead"
>
> probe(myVariable)
> probe(otherVariable)
>
> instead of the longer
>
> print "myVariable = ", myVariable
> print "otherVariable = ", otherVariable
>
> Is that even possible?
>
> The function would look like
>
> def probe(var):
>     nameOfVar = someMagic(var)
>     print nameOfVar, " = ", var
>
> but can someMagic(var) find the variable name? Is that possible?
>   

That question really doesn't  quite make sense.    Consider all the 
ways  such a function can be called:
  someMagic(42)
  someMagic(40+2)
  someMagic(f(123))
  someMagic(*argTuple)
  someMagic(**kwDict)
  someMagic(array[42])
None of which have a variable name associated with the argument.

Yet, the answer to your question is not quite absolutely "no".  Python 
has lots of introspection capabilities, including, perhaps, getting at 
and parsing the original code to find the call.    But there's nothing 
direct for what you want.

Gary Herron


 




From vicente.soler at gmail.com  Sun Mar 14 13:17:48 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sun, 14 Mar 2010 10:17:48 -0700 (PDT)
Subject: iterator/generator
Message-ID: <db51dbb8-920a-405a-8ddc-2a734f7140ac@q21g2000yqm.googlegroups.com>

I am working on a script that reads data from an excel workbook. The
data is located in a named range whose first row contains the headers.
It works!!!  I find it superb that python is able to do such things!!!

Now my questions.

a. My ranges can in practice be quite big, and although I am happy
with the speed I get, because I am learning python, I think I could do
it still a bit better. I think that the line   for i in matriz[1:]:
could be improved with an iterator/generator, but I am not quite
certain how I should proceed.

b. the following lines could be improved by means of a defaultdict,
that I know because of a previous post. However you may come up with
some other ideas (this b. question is not my main concern, you may
discard it if you find the post too long)

        if i[a] and not(i[a] in g) and i[b]:
            g[i[a]] = i[b]
        elif i[a] and (i[a] in g) and i[b]:
            g[i[a]] += i[b]

Can anybody provide some hints?  Thank you for your cooperation.

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
import win32com.client as win32

def agrupar(matriz, c1, c2):
    a, b = matriz[0].index(c1), matriz[0].index(c2)
    g = {}
    for i in matriz[1:]:
        if i[a] and not(i[a] in g) and i[b]:
            g[i[a]] = i[b]
        elif i[a] and (i[a] in g) and i[b]:
            g[i[a]] += i[b]
    for k in g:
        print '%-50s     %15d' % (k, g[k])

# Abrir fichero excel
xl = win32.gencache.EnsureDispatch('Excel.Application')
##xl.Visible = True
wb=xl.Workbooks.Open(r'C:\Users\Vicente\Documents\VS\Python
\Presupuesto fijos 10YP 2011-2020 V0.xls')

# Obtenci?n de datos
datos=wb.Names('Datos').RefersToRange()
print
agrupar(datos, u'NomCC', u'BGT-09')

# Cerrar libro de trabajo
wb.Close()
print


From steve at holdenweb.com  Sun Mar 14 13:49:47 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 14 Mar 2010 13:49:47 -0400
Subject: iterator/generator
In-Reply-To: <db51dbb8-920a-405a-8ddc-2a734f7140ac@q21g2000yqm.googlegroups.com>
References: <db51dbb8-920a-405a-8ddc-2a734f7140ac@q21g2000yqm.googlegroups.com>
Message-ID: <hnj7lh$d05$1@dough.gmane.org>

vsoler wrote:
> I am working on a script that reads data from an excel workbook. The
> data is located in a named range whose first row contains the headers.
> It works!!!  I find it superb that python is able to do such things!!!
> 
> Now my questions.
> 
> a. My ranges can in practice be quite big, and although I am happy
> with the speed I get, because I am learning python, I think I could do
> it still a bit better. I think that the line   for i in matriz[1:]:
> could be improved with an iterator/generator, but I am not quite
> certain how I should proceed.
> 
> b. the following lines could be improved by means of a defaultdict,
> that I know because of a previous post. However you may come up with
> some other ideas (this b. question is not my main concern, you may
> discard it if you find the post too long)
> 
>         if i[a] and not(i[a] in g) and i[b]:
>             g[i[a]] = i[b]
>         elif i[a] and (i[a] in g) and i[b]:
>             g[i[a]] += i[b]
> 
> Can anybody provide some hints?  Thank you for your cooperation.
> 
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> +
> import win32com.client as win32
> 
> def agrupar(matriz, c1, c2):
>     a, b = matriz[0].index(c1), matriz[0].index(c2)
>     g = {}
>     for i in matriz[1:]:
>         if i[a] and not(i[a] in g) and i[b]:
>             g[i[a]] = i[b]
>         elif i[a] and (i[a] in g) and i[b]:
>             g[i[a]] += i[b]
>     for k in g:
>         print '%-50s     %15d' % (k, g[k])
> 
> # Abrir fichero excel
> xl = win32.gencache.EnsureDispatch('Excel.Application')
> ##xl.Visible = True
> wb=xl.Workbooks.Open(r'C:\Users\Vicente\Documents\VS\Python
> \Presupuesto fijos 10YP 2011-2020 V0.xls')
> 
> # Obtenci?n de datos
> datos=wb.Names('Datos').RefersToRange()
> print
> agrupar(datos, u'NomCC', u'BGT-09')
> 
> # Cerrar libro de trabajo
> wb.Close()
> print

Before you go too far down this road (and congratulations, by the way,
on having achieved what you already have!) you might like to consider
the xlrd, xlwt and xlutils modules.

Not only are they easy to use, they are also (I believe) cross-platform
and do not require Excel to be loaded on the machine running the programs.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From maymunbeyin at gmail.com  Sun Mar 14 14:16:50 2010
From: maymunbeyin at gmail.com (kuru)
Date: Sun, 14 Mar 2010 11:16:50 -0700 (PDT)
Subject: Feeding differeent data types to a class instance?
References: <ac9a5500-6b06-4fee-b483-bab76922b44e@d2g2000yqa.googlegroups.com>
	<mailman.728.1268571895.23598.python-list@python.org>
Message-ID: <3189fde6-bd5e-4ee2-8a8e-41c55cf9f926@q23g2000yqd.googlegroups.com>

Hi

Thank you so much for all these great suggestions. I will have time
today to try all these and see which one works best for me

cheers


From kevin.p.dwyer at gmail.com  Sun Mar 14 14:18:45 2010
From: kevin.p.dwyer at gmail.com (Kev Dwyer)
Date: Sun, 14 Mar 2010 18:18:45 +0000 (UTC)
Subject: Is it possible to use re2 from Python?
References: <f853ea28-b236-4a17-8ded-43e5fe455d47@a18g2000yqc.googlegroups.com>
Message-ID: <hnj9a5$mv9$1@dough.gmane.org>

On Sun, 14 Mar 2010 08:57:36 -0700, _wolf wrote:


> 
> how can i use re2 from Python?
> 

Hello Wolf,

There's a recent thread about this on the python-dev list, 
Unfortunately it seems to suggest that there are no Python
bindings at present.

Cheers,

Kev





From CalWhoNOSPAM at roadrunner.com  Sun Mar 14 14:20:55 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Sun, 14 Mar 2010 14:20:55 -0400
Subject: What does Error: 'module' object is not callable Mean?
Message-ID: <hnj9ea$hdi$1@news.eternal-september.org>


The below code produces the error as indicated. But, in
 E:\Python26\Lib\site-packages\ffnet\tools I see:
    drawffnet.py
    drawffnet.pyc
    drawffnet.pyo
Is that what it is looking for?

I'm not sure what "not callable" means.
Could it be referencing to "nn" rather than drawffnet?
What should I do to investigate this?

Thanks
from ffnet import ffnet, mlgraph, readdata

...snipped working code here ...

output, regression = nn.test(inputs2, targets2, iprint = 2)

from ffnet.tools import drawffnet
import pylab
drawffnet(nn)   #Error: 'module' object is not callable
pylab.show()
except ImportError, e:
print "Cannot make drawffnet plot." 




From tartley at tartley.com  Sun Mar 14 14:24:07 2010
From: tartley at tartley.com (Jonathan Hartley)
Date: Sun, 14 Mar 2010 11:24:07 -0700 (PDT)
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com><50697b2c1003122012q3c2530bt79666118bc639b87@mail.gmail.com><4B9B17B3.8000307@cnsp.com>
	<50697b2c1003122047l5b8fa440lc6f1389b58d02df@mail.gmail.com> 
	<mailman.704.1268487914.23598.python-list@python.org>
Message-ID: <78b76065-5fcc-4d00-801c-bed3c8a3a1d7@x12g2000yqx.googlegroups.com>

On Mar 13, 1:45?pm, pyt... at bdurham.com wrote:
> Robin,
>
> > do you of an alternate compilter it doesn't work (py2exe) on my windows 7 box
>
> I can assure you that Py2exe does work on Windows 7 (my firm develops
> commercial Python applications packaged using Py2exe running on Windows
> 7), but it does take a bit of fiddling and some patience. Join the
> py2exe newsgroup and post your problems there.https://lists.sourceforge.net/lists/listinfo/py2exe-users
>
> You may also want to google 'Gui2exe'. This is a free front-end to
> Py2exe that you can use to generate your Py2exe setup.py scripts. Note
> that Gui2exe requires wxPython (free) to run.
>
> Finally, make sure you are trying to compile 32-bit Python 2.x code. I
> don't think py2exe supports Python 3.x or 64-bit versions of Python yet.
>
> > Nope; py2exe is pretty much the go-to tool for this.
>
> I hear great things about PyInstaller. The project is not dead - make
> sure you use the latest version in the SVN.
>
> Search stackoverflow.com for positive feedback and tips on PyInstaller.
> Its on our plate to take a good look this product 'one of these days'.
>
> Good luck!
>
> Malcolm

I summarised a all the alternatives to py2exe I could find, here:
http://spreadsheets.google.com/pub?key=tZ42hjaRunvkObFq0bKxVdg&output=html

Looking for those with a green 'y' in the 'Windows' row, you want to
check out cx_freeze, PyInstaller, bbfreeze.

Best of luck.


From mehgcap at gmail.com  Sun Mar 14 14:26:18 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Sun, 14 Mar 2010 14:26:18 -0400
Subject: problem with variable and function
Message-ID: <bc7f680c1003141126j50bd49aeq1d81511121ef9ed5@mail.gmail.com>

Hi all,
I have a file with a dictionary and a function. The dictionary holds
the name of the function, and the function references the dictionary.
If I put the dictionary first, the function is happy but the
dictionary says the function is not defined. If I switch the two and
put the function first, the function says the dictionary does not
exist. Does anyone have an idea as to how I can make both of them
happy? Thanks!

Example:

myVar={
 1:myFunc
}

def myFunc():
 myOtherVar=myVar

would result in myVar saying myFunc does not exist. Reverse it, though:

def myFunc():
 myOtherVar=myVar

myVar={
 1:myFunc
}

and the function myFunc does not see the dictionary. I basically
cannot win either way, and I need a way to resolve this. If you are
curious, the dictionary holds function names and maps to a second
dictionary of keystrokes, allowing me to map a keystroke to call a
function. Thanks!

-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From python.list at tim.thechases.com  Sun Mar 14 14:30:59 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Sun, 14 Mar 2010 13:30:59 -0500
Subject: "Breaking" the __main__ script
In-Reply-To: <1268579027.18252.1364740493@webmail.messagingengine.com>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com><mailman.726.1268567615.23598.python-list@python.org>	<hnik9k$ju1$1@news.urz.uni-heidelberg.de>
	<1268579027.18252.1364740493@webmail.messagingengine.com>
Message-ID: <4B9D2B63.8030202@tim.thechases.com>

python at bdurham.com wrote:
>> Or you could use a real debugger, like pdb
>> http://docs.python.org/library/pdb.html
> 
> Any reason you prefer PDB over WinPDB?
> http://winpdb.org/

I always count "in the standard library" as a big plus over any 
add-ons  It's nice to know about alternatives such as WinPDB, but 
everybody that has python also has pdb already installed.

-tkc





From apt.shansen at gmail.com  Sun Mar 14 14:33:34 2010
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 14 Mar 2010 10:33:34 -0800
Subject: What does Error: 'module' object is not callable Mean?
In-Reply-To: <hnj9ea$hdi$1@news.eternal-september.org>
References: <hnj9ea$hdi$1@news.eternal-september.org>
Message-ID: <7a9c25c21003141133x567949b2pf002904e8e22fdf5@mail.gmail.com>

On Sun, Mar 14, 2010 at 10:20 AM, Cal Who <CalWhoNOSPAM at roadrunner.com>wrote:

> from ffnet.tools import drawffnet
> import pylab
> drawffnet(nn)   #Error: 'module' object is not callable


First and foremost, please please please: don't describe or paraphrase
tracebacks when asking for help, show them. The whole thing. It doesn't
-really- matter here, but it still applies.

>
That said, "drawffnet" is a module.

You can't call -- put () on the end of -- a module. Its not a function. Its
a file containing code.

Perhaps you mean drawffnet.drawffnet()?


--S
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From python at bdurham.com  Sun Mar 14 14:36:34 2010
From: python at bdurham.com (python at bdurham.com)
Date: Sun, 14 Mar 2010 14:36:34 -0400
Subject: python to exe
In-Reply-To: <78b76065-5fcc-4d00-801c-bed3c8a3a1d7@x12g2000yqx.googlegroups.com>
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com><50697b2c1003122012q3c2530bt79666118bc639b87@mail.gmail.com><4B9B17B3.8000307@cnsp.com><50697b2c1003122047l5b8fa440lc6f1389b58d02df@mail.gmail.com>
	<mailman.704.1268487914.23598.python-list@python.org>
	<78b76065-5fcc-4d00-801c-bed3c8a3a1d7@x12g2000yqx.googlegroups.com>
Message-ID: <1268591794.10570.1364759429@webmail.messagingengine.com>

Jonathan,

> I summarised a all the alternatives to py2exe I could find, here:
> http://spreadsheets.google.com/pub?key=tZ42hjaRunvkObFq0bKxVdg&output=html

Really great work - thanks for sharing this with all of us!!!

Regards,
Malcolm


From tack at urandom.ca  Sun Mar 14 14:40:55 2010
From: tack at urandom.ca (Jason Tackaberry)
Date: Sun, 14 Mar 2010 14:40:55 -0400
Subject: problem with variable and function
In-Reply-To: <bc7f680c1003141126j50bd49aeq1d81511121ef9ed5@mail.gmail.com>
References: <bc7f680c1003141126j50bd49aeq1d81511121ef9ed5@mail.gmail.com>
Message-ID: <1268592055.14177.499.camel@willow>

Hi Alex,

On Sun, 2010-03-14 at 14:26 -0400, Alex Hall wrote:
> Reverse it, though:
> 
> def myFunc():
>  myOtherVar=myVar
> 
> myVar={
>  1:myFunc
> }
> 
> and the function myFunc does not see the dictionary.

The code you provided works just fine (as one would expect).  If you can
provide an example doesn't work, we should be able to explain why and
provide advice.

Cheers,
Jason.



From tjreedy at udel.edu  Sun Mar 14 14:41:22 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 14 Mar 2010 14:41:22 -0400
Subject: Some PyCon videos won't play
In-Reply-To: <hniugj$b36$1@get-news01.get.basefarm.net>
References: <SNT106-W28E9678F29E5527CFCBB88B1300@phx.gbl>	<mailman.716.1268506909.23598.python-list@python.org>
	<hniugj$b36$1@get-news01.get.basefarm.net>
Message-ID: <hnjakh$mcv$1@dough.gmane.org>

On 3/14/2010 11:14 AM, David Boddie wrote:
> On Saturday 13 March 2010 20:01, Terry Reedy wrote:
>
>> On 3/13/2010 11:23 AM, Lee Harr wrote:
>>>
>>> I am having a great time watching videos from PyCon. Thanks to
>>> everyone who presented, and to those who did such a great job
>>> putting the videos up at: http://pycon.blip.tv/
>>>
>>> My trouble is that, although most of the videos play perfectly,
>>> there are a few that refuse to play at all. Like:
>
> [...]
>
>>> Is anyone else having trouble with these?
>>
>> Yes, 'spinner' spins indefinitely, while others load and play.
>
> You should still be able to get at the videos themselves by inspecting
> the page contents, looking for download links like this one:
>
> http://blip.tv/file/get/Pycon-PyCon2010UsingPythonToCreateRoboticSimulationsForPlaneta894.ogv
>
> In this case, it's an Ogg Theora video file, so you may want to use
> a player like VLC to view it:

For people using html5 competant browsers, which, I believe, play .ogv 
'in tha page', blip.tv just needs to update site to make html5 pages an 
alternative to using the flash player.



From benjamin.kaplan at case.edu  Sun Mar 14 14:41:25 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sun, 14 Mar 2010 14:41:25 -0400
Subject: What does Error: 'module' object is not callable Mean?
In-Reply-To: <hnj9ea$hdi$1@news.eternal-september.org>
References: <hnj9ea$hdi$1@news.eternal-september.org>
Message-ID: <ec96e1391003141141k40c81385v27c5161800d4f9dd@mail.gmail.com>

On Sun, Mar 14, 2010 at 2:20 PM, Cal Who <CalWhoNOSPAM at roadrunner.com>wrote:

>
> The below code produces the error as indicated. But, in
>  E:\Python26\Lib\site-packages\ffnet\tools I see:
>    drawffnet.py
>    drawffnet.pyc
>    drawffnet.pyo
> Is that what it is looking for?
>
> I'm not sure what "not callable" means.
> Could it be referencing to "nn" rather than drawffnet?
> What should I do to investigate this?
>
> Thanks
> from ffnet import ffnet, mlgraph, readdata
>
> ...snipped working code here ...
>
> output, regression = nn.test(inputs2, targets2, iprint = 2)
>
> from ffnet.tools import drawffnet
> import pylab
> drawffnet(nn)   #Error: 'module' object is not callable
> pylab.show()
> except ImportError, e:
> print "Cannot make drawffnet plot."
>
>
In Python, everything is an object. Certain objects, like functions, are
callable. Other objects, like modules are not. You have a module mapped to
the name "drawffnet". Python tries to call that object, but it isn't
callable. If there is a function drawffnet inside the drawffnet module (I'm
not familiar with the package, so I don't know), you need to call that
specifically.

drawffnet.drawffnet(nn)

>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From python at mrabarnett.plus.com  Sun Mar 14 14:46:29 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Sun, 14 Mar 2010 18:46:29 +0000
Subject: What does Error: 'module' object is not callable Mean?
In-Reply-To: <hnj9ea$hdi$1@news.eternal-september.org>
References: <hnj9ea$hdi$1@news.eternal-september.org>
Message-ID: <4B9D2F05.1060101@mrabarnett.plus.com>

  Cal Who wrote:
> The below code produces the error as indicated. But, in
>  E:\Python26\Lib\site-packages\ffnet\tools I see:
>     drawffnet.py
>     drawffnet.pyc
>     drawffnet.pyo
> Is that what it is looking for?
> 
> I'm not sure what "not callable" means.
> Could it be referencing to "nn" rather than drawffnet?
> What should I do to investigate this?
> 
> Thanks
> from ffnet import ffnet, mlgraph, readdata
> 
> ...snipped working code here ...
> 
> output, regression = nn.test(inputs2, targets2, iprint = 2)
> 
> from ffnet.tools import drawffnet
> import pylab
> drawffnet(nn)   #Error: 'module' object is not callable
> pylab.show()
> except ImportError, e:
> print "Cannot make drawffnet plot." 
> 
You're importing the module 'drawffnet' and then trying to call it in:

     drawffnet(nn)

but, as the traceback says, modules can't be called.

I had a quick look at the documentation and it looks like you should be
calling a function called 'drawffnet' that's defined in the module
called 'drawffnet'. Try doing:

     from ffnet.tools.drawffnet import drawffnet

instead.


From tjreedy at udel.edu  Sun Mar 14 14:47:45 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 14 Mar 2010 14:47:45 -0400
Subject: What does Error: 'module' object is not callable Mean?
In-Reply-To: <hnj9ea$hdi$1@news.eternal-september.org>
References: <hnj9ea$hdi$1@news.eternal-september.org>
Message-ID: <hnjb0h$nji$1@dough.gmane.org>

On 3/14/2010 2:20 PM,  Cal Who wrote:
>
> The below code produces the error as indicated. But, in
>   E:\Python26\Lib\site-packages\ffnet\tools I see:
>      drawffnet.py

drawffnet is a module initialized from drawffnet.py (or either of the below)

>      drawffnet.pyc
>      drawffnet.pyo
> Is that what it is looking for?
>
> I'm not sure what "not callable" means.
> Could it be referencing to "nn" rather than drawffnet?
> What should I do to investigate this?
>
> Thanks
> from ffnet import ffnet, mlgraph, readdata
>
> ...snipped working code here ...
>
> output, regression = nn.test(inputs2, targets2, iprint = 2)
>
> from ffnet.tools import drawffnet

here you create drawffnet from one of the files.

> import pylab
> drawffnet(nn)   #Error: 'module' object is not callable

This is an attempt to call the module as if it were a functions, which 
it is not. You probably want to call a function within the module.


> pylab.show()
> except ImportError, e:
> print "Cannot make drawffnet plot."
>
>




From clp2 at rebertia.com  Sun Mar 14 14:48:18 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 14 Mar 2010 10:48:18 -0800
Subject: problem with variable and function
In-Reply-To: <bc7f680c1003141126j50bd49aeq1d81511121ef9ed5@mail.gmail.com>
References: <bc7f680c1003141126j50bd49aeq1d81511121ef9ed5@mail.gmail.com>
Message-ID: <50697b2c1003141148i1704ff81j38e052fc0539619f@mail.gmail.com>

On Sun, Mar 14, 2010 at 10:26 AM, Alex Hall <mehgcap at gmail.com> wrote:
> Hi all,
> I have a file with a dictionary and a function. The dictionary holds
> the name of the function, and the function references the dictionary.
> If I put the dictionary first, the function is happy but the
> dictionary says the function is not defined. If I switch the two and
> put the function first, the function says the dictionary does not
> exist. Does anyone have an idea as to how I can make both of them
> happy?
<snip>
> Reverse it, though:
>
> def myFunc():
> ?myOtherVar=myVar
>
> myVar={
> ?1:myFunc
> }
>
> and the function myFunc does not see the dictionary.

Please be more specific in what you mean by it not "seeing" the
dictionary, because the "reversed" approach *should* work:

$ python
Python 2.6.4 (r264:75706, Feb 25 2010, 01:21:39)
[GCC 4.2.1 (Apple Inc. build 5646) (dot 1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> def foo():
...     bar = baz
...     print bar
...
>>> baz = {1:foo}
>>> foo()
{1: <function foo at 0x37b870>}

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


From CalWho at roadrunner.com  Sun Mar 14 14:57:02 2010
From: CalWho at roadrunner.com (Cal Who)
Date: Sun, 14 Mar 2010 14:57:02 -0400
Subject: What does Error: 'module' object is not callable Mean?
References: <hnj9ea$hdi$1@news.eternal-september.org>
	<7a9c25c21003141133x567949b2pf002904e8e22fdf5@mail.gmail.com>
Message-ID: <379818115B06492999BA94573F720BCB@dad>


  ----- Original Message ----- 
  From: Stephen Hansen 
  To: Cal Who 
  Cc: python-list at python.org 
  Sent: Sunday, March 14, 2010 2:33 PM
  Subject: Re: What does Error: 'module' object is not callable Mean?


  On Sun, Mar 14, 2010 at 10:20 AM, Cal Who <CalWhoNOSPAM at roadrunner.com> wrote:
    from ffnet.tools import drawffnet
    import pylab
    drawffnet(nn)   #Error: 'module' object is not callable


  First and foremost, please please please: don't describe or paraphrase tracebacks when asking for help, show them. The whole thing. It doesn't -really- matter here, but it still applies. 


  I'll keep that in mind but in this instance I simply cut and pasted the message.




  That said, "drawffnet" is a module.


  You can't call -- put () on the end of -- a module. Its not a function. Its a file containing code.


  Perhaps you mean drawffnet.drawffnet()?



  I copied that code from an example and what you suggested fixed it. 
  Thanks.




  --S


------------------------------------------------------------------------------



  No virus found in this incoming message.
  Checked by AVG - www.avg.com 
  Version: 9.0.733 / Virus Database: 271.1.1/2746 - Release Date: 03/14/10 03:33:00
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From john at castleamber.com  Sun Mar 14 15:10:32 2010
From: john at castleamber.com (John Bokma)
Date: Sun, 14 Mar 2010 13:10:32 -0600
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
	<87fx443vgo.fsf@castleamber.com>
	<lpcop5d7qgc7a4qbdqu5jf4r5da1ojkqhj@4ax.com>
Message-ID: <87sk82zplj.fsf@castleamber.com>

David Monaghan <monaghand.david at gmail.com> writes:

> of Google. If they haven't used it, I don't really consider the gentle
> reminder that LMGTFY gives too harsh. If you do, you're too much of a gentle
> soul to be on the internet at all; someone might say "Boo" to you at any
> moment. Beware.

I've no problem with lmgtfy. I *do* have a problem with hiding it behing
a tinyurl. Why use 2 levels of obfuscating in a group that's about
programming in a language that promotes clear coding?

The message would have been the same if the OP had just copy pasted the
Google link. But hey, that's way less "funny".

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From mehgcap at gmail.com  Sun Mar 14 15:12:35 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Sun, 14 Mar 2010 15:12:35 -0400
Subject: problem with variable and function
In-Reply-To: <50697b2c1003141148i1704ff81j38e052fc0539619f@mail.gmail.com>
References: <bc7f680c1003141126j50bd49aeq1d81511121ef9ed5@mail.gmail.com>
	<50697b2c1003141148i1704ff81j38e052fc0539619f@mail.gmail.com>
Message-ID: <bc7f680c1003141212y10c55f05u88d6c81384baead8@mail.gmail.com>

Below is pasted the function which is looking for the "funcs"
dictionary, as well as the dictionary. They appear in my py file in
this order, yet I get an error in nextMode() that "global name 'funcs'
is not defined". Oddly, the keys dictionary works fine; it is defined
above the nextMode function.

def nextMode():
 global HOTKEYS
 global HOTKEY_ACTIONS
 global mode
 global modes
 global modeNum
 global modeNames
 global funcs
 #mode=mode+1
 #check to make sure the newly selected mode is enabled
 tmp=0
 while(tmp<modeNum):
  mode=(mode+1)%modeNum
  if(sys.modules[modeNames[mode]].enabled=='True'):
   break #break on the first enabled mode we find
  #end if
  tmp+=1
 #end while
 HOTKEYS=keys[mode]
 HOTKEY_ACTIONS=funcs[mode]
 registerHotkeys()
 speak("Now in "+str(modes[mode])+" mode.")
#end def

#we now have the default mode to be used, but what if it is disabled?
if(sys.modules[modeNames[mode]].enabled=='False'):
 nextMode()
#end if

funcs=[]
#this dict MUST be defined after all the functions it uses have been
#ARM function dictionary
funcs.append({
  1 : exitProgram,
  2 : arm.sayLoad1,
  3 : arm.sayLoad2,
  4 : arm.sayLoad3,
  5 : arm.sayLoad4,
  6 : arm.sayProcAvg,
  7 : arm.sayUsedRam,
  8 : arm.sayDisk1Info,
  9 : arm.sayDisk2Info,
  10 : nextMode,
  11: clipboard.toClipboard
})

#weather function dictionary
funcs.append({
  1 : exitProgram,
  2 : weather.getCurrent,
  3 : weather.getToday,
  4 : weather.getTomorrow,
  5 : weather.getTwoDays,
  6 : weather.getThreeDays,
  7 : weather.switchLocation,
  8 : arm.sayDisk1Info,
  9 : arm.sayDisk2Info,
  10 : nextMode,
  11 : clipboard.toClipboard
})
funcs.append({
  1 : exitProgram,
  2 : network.speed,
  3 : arm.sayLoad2,
  4 : arm.sayLoad3,
  5 : arm.sayLoad4,
  6 : arm.sayProcAvg,
  7 : arm.sayUsedRam,
  8 : arm.sayDisk1Info,
  9 : arm.sayDisk2Info,
  10 : nextMode,
  11 : clipboard.toClipboard
})


HOTKEY_ACTIONS=funcs[mode]


On 3/14/10, Chris Rebert <clp2 at rebertia.com> wrote:
> On Sun, Mar 14, 2010 at 10:26 AM, Alex Hall <mehgcap at gmail.com> wrote:
>> Hi all,
>> I have a file with a dictionary and a function. The dictionary holds
>> the name of the function, and the function references the dictionary.
>> If I put the dictionary first, the function is happy but the
>> dictionary says the function is not defined. If I switch the two and
>> put the function first, the function says the dictionary does not
>> exist. Does anyone have an idea as to how I can make both of them
>> happy?
> <snip>
>> Reverse it, though:
>>
>> def myFunc():
>> ?myOtherVar=myVar
>>
>> myVar={
>> ?1:myFunc
>> }
>>
>> and the function myFunc does not see the dictionary.
>
> Please be more specific in what you mean by it not "seeing" the
> dictionary, because the "reversed" approach *should* work:
>
> $ python
> Python 2.6.4 (r264:75706, Feb 25 2010, 01:21:39)
> [GCC 4.2.1 (Apple Inc. build 5646) (dot 1)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> def foo():
> ...     bar = baz
> ...     print bar
> ...
>>>> baz = {1:foo}
>>>> foo()
> {1: <function foo at 0x37b870>}
>
> Cheers,
> Chris
> --
> http://blog.rebertia.com
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From clp2 at rebertia.com  Sun Mar 14 15:24:11 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 14 Mar 2010 11:24:11 -0800
Subject: problem with variable and function
In-Reply-To: <bc7f680c1003141212y10c55f05u88d6c81384baead8@mail.gmail.com>
References: <bc7f680c1003141126j50bd49aeq1d81511121ef9ed5@mail.gmail.com>
	<50697b2c1003141148i1704ff81j38e052fc0539619f@mail.gmail.com>
	<bc7f680c1003141212y10c55f05u88d6c81384baead8@mail.gmail.com>
Message-ID: <50697b2c1003141224o2b645404u30fbc80140eec6bc@mail.gmail.com>

> On 3/14/10, Chris Rebert <clp2 at rebertia.com> wrote:
>> On Sun, Mar 14, 2010 at 10:26 AM, Alex Hall <mehgcap at gmail.com> wrote:
>>> Hi all,
>>> I have a file with a dictionary and a function. The dictionary holds
>>> the name of the function, and the function references the dictionary.
>>> If I put the dictionary first, the function is happy but the
>>> dictionary says the function is not defined. If I switch the two and
>>> put the function first, the function says the dictionary does not
>>> exist. Does anyone have an idea as to how I can make both of them
>>> happy?
>> <snip>
>>> Reverse it, though:
>>>
>>> def myFunc():
>>>  myOtherVar=myVar
>>>
>>> myVar={
>>>  1:myFunc
>>> }
>>>
>>> and the function myFunc does not see the dictionary.
>>
>> Please be more specific in what you mean by it not "seeing" the
>> dictionary, because the "reversed" approach *should* work:
>>
>> $ python
>> Python 2.6.4 (r264:75706, Feb 25 2010, 01:21:39)
>> [GCC 4.2.1 (Apple Inc. build 5646) (dot 1)] on darwin
>> Type "help", "copyright", "credits" or "license" for more information.
>>>>> def foo():
>> ...     bar = baz
>> ...     print bar
>> ...
>>>>> baz = {1:foo}
>>>>> foo()
>> {1: <function foo at 0x37b870>}

On Sun, Mar 14, 2010 at 11:12 AM, Alex Hall <mehgcap at gmail.com> wrote:
> Below is pasted the function which is looking for the "funcs"
> dictionary, as well as the dictionary. They appear in my py file in
> this order, yet I get an error in nextMode() that "global name 'funcs'
> is not defined". Oddly, the keys dictionary works fine; it is defined
> above the nextMode function.

Please include the full exception Traceback.
Also, please don't top-post in the future.

> def nextMode():
> ?global HOTKEYS
> ?global HOTKEY_ACTIONS
> ?global mode

You don't need a `global` declaration unless your function needs to
rebind the global variable in question.
So you can remove the next 4 global declarations; they're unnecessary.

> ?global modes
> ?global modeNum
> ?global modeNames
> ?global funcs
> ?#mode=mode+1
> ?#check to make sure the newly selected mode is enabled
> ?tmp=0
> ?while(tmp<modeNum):
> ?mode=(mode+1)%modeNum
> ?if(sys.modules[modeNames[mode]].enabled=='True'):
> ? break #break on the first enabled mode we find
> ?#end if
> ?tmp+=1
> ?#end while
> ?HOTKEYS=keys[mode]
> ?HOTKEY_ACTIONS=funcs[mode]
> ?registerHotkeys()
> ?speak("Now in "+str(modes[mode])+" mode.")
> #end def
>
> #we now have the default mode to be used, but what if it is disabled?
> if(sys.modules[modeNames[mode]].enabled=='False'):
> ?nextMode()

How is this call supposed to work when `funcs` (which nextMode() uses)
hasn't been defined yet?!

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


From yoavglazner at gmail.com  Sun Mar 14 15:30:43 2010
From: yoavglazner at gmail.com (Glazner)
Date: Sun, 14 Mar 2010 12:30:43 -0700 (PDT)
Subject: how to start a python script only once
References: <4b9bdd61$0$22515$426a74cc@news.free.fr>
Message-ID: <c31eefda-4734-4e9b-a743-7837c77f1ae1@m37g2000yqf.googlegroups.com>

On Mar 13, 8:45?pm, News123 <news1... at free.fr> wrote:
> Hi,
>
> I'd like to make sure, that a certain python program will only be run
> once per host. (linux/windows)
>
> so if the program is started a second time it should just terminate and
> let the other one run.
>
> This does not have to be the fastest solution, but it should be reliable.
>
> I have a few ideas, but wonder, which one is the most common
>
> My ideas so far:
>
> pid file and file locking
> --------------------------
> create a file like program.pid ?with the pid of the running program an
> use file locking to avoid race connditions.
>
> However I currently don't know how to do file locking under windows
> and I don't know how to do file lockng with python and linux.
> I'll start googling.
>
> sqlite and locking
> --------------------
> quite some time ago I used a mysql table and locking as an inter-host mutex.
>
> Perhaps sqlite would be good enough for an inter process mutex for
> processes on the same host, but I don't know it well enough.
>
> interprocess mutex
> --------------------
> well I even don't know whether something like this exists on linux / windows
>
> Thanks in advanced for any tips
>
> N

I'll just open a port with a TCP socket, it is cross-platform and free
from race conditions.


From mehgcap at gmail.com  Sun Mar 14 15:34:20 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Sun, 14 Mar 2010 15:34:20 -0400
Subject: problem with variable and function
In-Reply-To: <50697b2c1003141224o2b645404u30fbc80140eec6bc@mail.gmail.com>
References: <bc7f680c1003141126j50bd49aeq1d81511121ef9ed5@mail.gmail.com>
	<50697b2c1003141148i1704ff81j38e052fc0539619f@mail.gmail.com>
	<bc7f680c1003141212y10c55f05u88d6c81384baead8@mail.gmail.com>
	<50697b2c1003141224o2b645404u30fbc80140eec6bc@mail.gmail.com>
Message-ID: <bc7f680c1003141234g2cc68e2al5f1af1e022325398@mail.gmail.com>

>> #we now have the default mode to be used, but what if it is disabled?
>> if(sys.modules[modeNames[mode]].enabled=='False'):
>>  nextMode()
>
>How is this call supposed to work when `funcs` (which nextMode() uses)
>hasn't been defined yet?!

That seems to have done it, thanks. Sorry about top-posting; inline
posting is much harder to read when using a screen reader, as I do, so
I am used to top-posting.


On 3/14/10, Chris Rebert <clp2 at rebertia.com> wrote:
>> On 3/14/10, Chris Rebert <clp2 at rebertia.com> wrote:
>>> On Sun, Mar 14, 2010 at 10:26 AM, Alex Hall <mehgcap at gmail.com> wrote:
>>>> Hi all,
>>>> I have a file with a dictionary and a function. The dictionary holds
>>>> the name of the function, and the function references the dictionary.
>>>> If I put the dictionary first, the function is happy but the
>>>> dictionary says the function is not defined. If I switch the two and
>>>> put the function first, the function says the dictionary does not
>>>> exist. Does anyone have an idea as to how I can make both of them
>>>> happy?
>>> <snip>
>>>> Reverse it, though:
>>>>
>>>> def myFunc():
>>>>  myOtherVar=myVar
>>>>
>>>> myVar={
>>>>  1:myFunc
>>>> }
>>>>
>>>> and the function myFunc does not see the dictionary.
>>>
>>> Please be more specific in what you mean by it not "seeing" the
>>> dictionary, because the "reversed" approach *should* work:
>>>
>>> $ python
>>> Python 2.6.4 (r264:75706, Feb 25 2010, 01:21:39)
>>> [GCC 4.2.1 (Apple Inc. build 5646) (dot 1)] on darwin
>>> Type "help", "copyright", "credits" or "license" for more information.
>>>>>> def foo():
>>> ...     bar = baz
>>> ...     print bar
>>> ...
>>>>>> baz = {1:foo}
>>>>>> foo()
>>> {1: <function foo at 0x37b870>}
>
> On Sun, Mar 14, 2010 at 11:12 AM, Alex Hall <mehgcap at gmail.com> wrote:
>> Below is pasted the function which is looking for the "funcs"
>> dictionary, as well as the dictionary. They appear in my py file in
>> this order, yet I get an error in nextMode() that "global name 'funcs'
>> is not defined". Oddly, the keys dictionary works fine; it is defined
>> above the nextMode function.
>
> Please include the full exception Traceback.
> Also, please don't top-post in the future.
>
>> def nextMode():
>> ?global HOTKEYS
>> ?global HOTKEY_ACTIONS
>> ?global mode
>
> You don't need a `global` declaration unless your function needs to
> rebind the global variable in question.
> So you can remove the next 4 global declarations; they're unnecessary.
>
>> ?global modes
>> ?global modeNum
>> ?global modeNames
>> ?global funcs
>> ?#mode=mode+1
>> ?#check to make sure the newly selected mode is enabled
>> ?tmp=0
>> ?while(tmp<modeNum):
>> ?mode=(mode+1)%modeNum
>> ?if(sys.modules[modeNames[mode]].enabled=='True'):
>> ? break #break on the first enabled mode we find
>> ?#end if
>> ?tmp+=1
>> ?#end while
>> ?HOTKEYS=keys[mode]
>> ?HOTKEY_ACTIONS=funcs[mode]
>> ?registerHotkeys()
>> ?speak("Now in "+str(modes[mode])+" mode.")
>> #end def
>>
>> #we now have the default mode to be used, but what if it is disabled?
>> if(sys.modules[modeNames[mode]].enabled=='False'):
>> ?nextMode()
>
> How is this call supposed to work when `funcs` (which nextMode() uses)
> hasn't been defined yet?!
>
> Cheers,
> Chris
> --
> http://blog.rebertia.com
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From spamfresser at ch3ka.de  Sun Mar 14 15:35:14 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Sun, 14 Mar 2010 20:35:14 +0100
Subject: "Breaking" the __main__ script
In-Reply-To: <mailman.733.1268579034.23598.python-list@python.org>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com><mailman.726.1268567615.23598.python-list@python.org>	<hnik9k$ju1$1@news.urz.uni-heidelberg.de>
	<mailman.733.1268579034.23598.python-list@python.org>
Message-ID: <hnjdpj$nk8$1@news.urz.uni-heidelberg.de>

Am 14.03.2010 16:03, schrieb python at bdurham.com:
> Any reason you prefer PDB over WinPDB?
> http://winpdb.org/

Yes. I don't have Windows except one one PC :P


From sivamadana at gmail.com  Sun Mar 14 16:01:26 2010
From: sivamadana at gmail.com (siva kumar)
Date: Sun, 14 Mar 2010 13:01:26 -0700 (PDT)
Subject: messages
Message-ID: <0273e5a4-2fed-48bb-a7c9-fbd298cd87dd@b36g2000pri.googlegroups.com>

For Good messages please visit

http://messagezonehere.blogspot.com/2010/03/friendly-messages.html


From monaghand.david at gmail.com  Sun Mar 14 16:04:01 2010
From: monaghand.david at gmail.com (David Monaghan)
Date: Sun, 14 Mar 2010 20:04:01 +0000
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
	<87fx443vgo.fsf@castleamber.com>
	<lpcop5d7qgc7a4qbdqu5jf4r5da1ojkqhj@4ax.com>
	<87sk82zplj.fsf@castleamber.com>
Message-ID: <r4gqp5du2f3gamdgkjeul4nag9sr3299v1@4ax.com>

On Sun, 14 Mar 2010 13:10:32 -0600, John Bokma <john at castleamber.com> wrote:

>David Monaghan <monaghand.david at gmail.com> writes:
>
>> of Google. If they haven't used it, I don't really consider the gentle
>> reminder that LMGTFY gives too harsh. If you do, you're too much of a gentle
>> soul to be on the internet at all; someone might say "Boo" to you at any
>> moment. Beware.

Sorry. That last comment of mine was uncalled for.

>I've no problem with lmgtfy. I *do* have a problem with hiding it behing
>a tinyurl. Why use 2 levels of obfuscating in a group that's about
>programming in a language that promotes clear coding?
>
>The message would have been the same if the OP had just copy pasted the
>Google link. But hey, that's way less "funny".

Good point, although one could argue the unhidden response is just rude, but
the masking does make it genuinely funny.

DaveM


From python at bdurham.com  Sun Mar 14 16:08:21 2010
From: python at bdurham.com (python at bdurham.com)
Date: Sun, 14 Mar 2010 16:08:21 -0400
Subject: "Breaking" the __main__ script
In-Reply-To: <hnjdpj$nk8$1@news.urz.uni-heidelberg.de>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com><mailman.726.1268567615.23598.python-list@python.org>
	<hnik9k$ju1$1@news.urz.uni-heidelberg.de><mailman.733.1268579034.23598.python-list@python.org>
	<hnjdpj$nk8$1@news.urz.uni-heidelberg.de>
Message-ID: <1268597301.21932.1364768439@webmail.messagingengine.com>

>> Any reason you prefer PDB over WinPDB?
>> http://winpdb.org/

> Yes. I don't have Windows except one one PC :P

WinPDB runs on non-Windows platforms :)

Malcolm



From ryan at rfk.id.au  Sun Mar 14 16:10:10 2010
From: ryan at rfk.id.au (Ryan Kelly)
Date: Mon, 15 Mar 2010 07:10:10 +1100
Subject: sqlite3 is sqlite 2?
In-Reply-To: <4B99D5C4.8070100@shopzeus.com>
References: <4B99D5C4.8070100@shopzeus.com>
Message-ID: <1268597410.2846.5.camel@durian>

On Fri, 2010-03-12 at 06:48 +0100, Laszlo Nagy wrote:
> gandalf at ubuntu:~$ python
> Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
> [GCC 4.3.3] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>  >>> import sqlite3
>  >>> sqlite3.version
> '2.4.1'
> 
> Is it possible to install a real sqlite version 3 somehow? I really need 
> it because I have to use savepoint/rollback to. That is only supported 
> from sqlite 3.6.8. Is it enough if I upgrade to Ubuntu Karmic? I know 
> that is not a question about Python itself.

That's the sqlite *bindings* version:

  >>> sqlite3.version
  '2.4.1'
  >>> sqlite3.sqlite_version
  '3.6.16'
  >>>

So this is "pysqlite" version 2.4.1, which wraps sqlite version 3.6.16.

Cheers,

  Ryan


-- 
Ryan Kelly
http://www.rfk.id.au  |  This message is digitally signed. Please visit
ryan at rfk.id.au        |  http://www.rfk.id.au/ramblings/gpg/ for details

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From john at castleamber.com  Sun Mar 14 16:11:18 2010
From: john at castleamber.com (John Bokma)
Date: Sun, 14 Mar 2010 14:11:18 -0600
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
	<87fx443vgo.fsf@castleamber.com>
	<lpcop5d7qgc7a4qbdqu5jf4r5da1ojkqhj@4ax.com>
	<87sk82zplj.fsf@castleamber.com>
	<r4gqp5du2f3gamdgkjeul4nag9sr3299v1@4ax.com>
Message-ID: <87fx42zms9.fsf@castleamber.com>

David Monaghan <monaghand.david at gmail.com> writes:

> On Sun, 14 Mar 2010 13:10:32 -0600, John Bokma <john at castleamber.com> wrote:
>
>>David Monaghan <monaghand.david at gmail.com> writes:
>>
>>> of Google. If they haven't used it, I don't really consider the gentle
>>> reminder that LMGTFY gives too harsh. If you do, you're too much of a gentle
>>> soul to be on the internet at all; someone might say "Boo" to you at any
>>> moment. Beware.
>
> Sorry. That last comment of mine was uncalled for.

Thanks.

>>I've no problem with lmgtfy. I *do* have a problem with hiding it behing
>>a tinyurl. Why use 2 levels of obfuscating in a group that's about
>>programming in a language that promotes clear coding?
>>
>>The message would have been the same if the OP had just copy pasted the
>>Google link. But hey, that's way less "funny".
>
> Good point, although one could argue the unhidden response is just rude, but
> the masking does make it genuinely funny.

One could argue, sure. But to me it's just the same as posting GFY
(don't want to upset the tender soulds again with "the F-word".

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From gatoygata2 at gmail.com  Sun Mar 14 16:11:29 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Sun, 14 Mar 2010 13:11:29 -0700 (PDT)
Subject: "Breaking" the __main__ script
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com><mailman.726.1268567615.23598.python-list@python.org>
	<hnik9k$ju1$1@news.urz.uni-heidelberg.de>
	<mailman.733.1268579034.23598.python-list@python.org> 
	<hnjdpj$nk8$1@news.urz.uni-heidelberg.de>
Message-ID: <7608c2b5-c7e2-4002-aacd-b4a53c487e54@q23g2000yqd.googlegroups.com>

On 14 mar, 20:35, Michael Rudolf <spamfres... at ch3ka.de> wrote:
> Am 14.03.2010 16:03, schrieb pyt... at bdurham.com:
>
> > Any reason you prefer PDB over WinPDB?
> >http://winpdb.org/
>
> Yes. I don't have Windows except one one PC :P

WinPdb is crossplatform. Is build with


From john at castleamber.com  Sun Mar 14 16:14:32 2010
From: john at castleamber.com (John Bokma)
Date: Sun, 14 Mar 2010 14:14:32 -0600
Subject: sqlite3 is sqlite 2?
References: <mailman.752.1268596146.23598.python-list@python.org>
Message-ID: <87bpeqzmmv.fsf@castleamber.com>

Laszlo Nagy <gandalf at shopzeus.com> writes:

> gandalf at ubuntu:~$ python
> Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
> [GCC 4.3.3] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import sqlite3
>>>> sqlite3.version
> '2.4.1'
>
> Is it possible to install a real sqlite version 3 somehow? I really
> need it because I have to use savepoint/rollback to. That is only
> supported from sqlite 3.6.8. Is it enough if I upgrade to Ubuntu
> Karmic? I know that is not a question about Python itself.
>
> But still, it is interesting that a module named "sqlite3" can
> actually be used for something called "sqlite 2".

You're mistaking the *module* version with the version of the database,
unless I am mistaken.

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From gatoygata2 at gmail.com  Sun Mar 14 16:18:19 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Sun, 14 Mar 2010 13:18:19 -0700 (PDT)
Subject: "Breaking" the __main__ script
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com><mailman.726.1268567615.23598.python-list@python.org>
	<hnik9k$ju1$1@news.urz.uni-heidelberg.de>
	<mailman.733.1268579034.23598.python-list@python.org> 
	<hnjdpj$nk8$1@news.urz.uni-heidelberg.de>
Message-ID: <6e5a7393-1ec5-4b60-894b-8574be2fe010@30g2000yqi.googlegroups.com>

On 14 mar, 20:35, Michael Rudolf <spamfres... at ch3ka.de> wrote:
> Am 14.03.2010 16:03, schrieb pyt... at bdurham.com:
>
> > Any reason you prefer PDB over WinPDB?
> >http://winpdb.org/
>
> Yes. I don't have Windows except one one PC :P

Sorry, i hit the wrong key. Again:
winpdb is crossplatform. It uses a wxwindows gui.
Names are not really fortunate...
I have installed the last winpdb 1.4.6 in SPE today.

atb
joaquin


From spamfresser at ch3ka.de  Sun Mar 14 16:32:30 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Sun, 14 Mar 2010 21:32:30 +0100
Subject: "Breaking" the __main__ script
In-Reply-To: <mailman.753.1268597303.23598.python-list@python.org>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com><mailman.726.1268567615.23598.python-list@python.org>	<hnik9k$ju1$1@news.urz.uni-heidelberg.de><mailman.733.1268579034.23598.python-list@python.org>	<hnjdpj$nk8$1@news.urz.uni-heidelberg.de>
	<mailman.753.1268597303.23598.python-list@python.org>
Message-ID: <hnjh4v$o6g$1@news.urz.uni-heidelberg.de>

Am 14.03.2010 21:08, schrieb python at bdurham.com:
>>> Any reason you prefer PDB over WinPDB?
>>> http://winpdb.org/
>> Yes. I don't have Windows except one one PC :P
> WinPDB runs on non-Windows platforms :)
Uh, OK.
Then the name mislead me ;)

But yeah, I prefer a console based debugger.


From guillermo.listas at googlemail.com  Sun Mar 14 16:40:09 2010
From: guillermo.listas at googlemail.com (Guillermo)
Date: Sun, 14 Mar 2010 13:40:09 -0700 (PDT)
Subject: Python unicode and Windows cmd.exe
Message-ID: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>

Hi,

I would appreciate if someone could point out what am I doing wrong
here.

Basically, I need to save a string containing non-ascii characters to
a file encoded in utf-8.

If I stay in python, everything seems to work fine, but the moment I
try to read the file with another Windows program, everything goes to
hell.

So here's the script unicode2file.py:
===================================================================
# encoding=utf-8
import codecs

f = codecs.open("m.txt",mode="w", encoding="utf8")
a = u"ma?ana"
print repr(a)
f.write(a)
f.close()

f = codecs.open("m.txt", mode="r", encoding="utf8")
a = f.read()
print repr(a)
f.close()
===================================================================

That gives the expected output, both calls to repr() yield the same
result.

But now, if I do type me.txt in cmd.exe, I get garbled characters
instead of "?".

I then open the file with my editor (Sublime Text), and I see "ma?ana"
normally. I save (nothing to be saved, really), go back to the dos
prompt, do type m.txt and I get again the same garbled characters.

I then open the file m.txt with notepad, and I see "ma?ana" normally.
I save (again, no actual modifications), go back to the dos prompt, do
type m.txt and this time it works! I get "ma?ana". When notepad opens
the file, the encoding is already UTF-8, so short of a UTF-8 bom being
added to the file, I don't know what happens when I save the
unmodified file. Also, I would think that the python script should
save a valid utf-8 file in the first place...

What's going on here?

Regards,
Guillermo


From vlastimil.brom at gmail.com  Sun Mar 14 16:49:56 2010
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Sun, 14 Mar 2010 21:49:56 +0100
Subject: Is it possible to use re2 from Python?
In-Reply-To: <f853ea28-b236-4a17-8ded-43e5fe455d47@a18g2000yqc.googlegroups.com>
References: <f853ea28-b236-4a17-8ded-43e5fe455d47@a18g2000yqc.googlegroups.com>
Message-ID: <9fdb569a1003141349u6f5eee8fk536cb48f139898c7@mail.gmail.com>

2010/3/14 _wolf <wolfgang.lipp at gmail.com>:
>...
> i would like to use re2 from Python (preferrably Python 3.1) and was
> excited to see files like make_unicode_groups.py in the distro (maybe
> just used during the build process?). those however were not deployed
> on my machine.
>...
>

If you would need a re engine with features like unicode rangees,
script, and character properties classes and many others, you may try
the proposed implementation of the re library currently available in
python issue tracker:
http://bugs.python.org/issue2636
I am personally more than satisfied with this development version
sofar, however, as some new feature like unlimited lookarounds etc.
suggest, it is a classic backtracking engine (as opposed to re2, if
you need this very implementation).

hth
  vbr


From steve at holdenweb.com  Sun Mar 14 16:55:20 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 14 Mar 2010 16:55:20 -0400
Subject: "Breaking" the __main__ script
In-Reply-To: <1268597301.21932.1364768439@webmail.messagingengine.com>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com><mailman.726.1268567615.23598.python-list@python.org>	<hnik9k$ju1$1@news.urz.uni-heidelberg.de><mailman.733.1268579034.23598.python-list@python.org>	<hnjdpj$nk8$1@news.urz.uni-heidelberg.de>
	<1268597301.21932.1364768439@webmail.messagingengine.com>
Message-ID: <hnjihi$eur$1@dough.gmane.org>

python at bdurham.com wrote:
>>> Any reason you prefer PDB over WinPDB?
>>> http://winpdb.org/
> 
>> Yes. I don't have Windows except one one PC :P
> 
> WinPDB runs on non-Windows platforms :)
> 
One might reasonably argue that it has a pretty couter-intuitive name, then.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From CalWhoNOSPAM at roadrunner.com  Sun Mar 14 16:58:54 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Sun, 14 Mar 2010 16:58:54 -0400
Subject: What does Error: 'module' object is not callable Mean?
References: <hnj9ea$hdi$1@news.eternal-september.org>
Message-ID: <hnjimh$je1$1@news.eternal-september.org>

Thanks for the replies.
That fixed it but produced another problem.

There are two plotting routines below.
Either one will work without error.
But the combo produces:
The exception unknown software exception (0x40000015) occurred in the 
application at location 0x1e05b62a.
in a dialog box and the following in the console
Fatal Python error: PyEval_RestoreThread: NULL tstate


This application has requested the Runtime to terminate it in an unusual 
way.

Please contact the application's support team for more information.

Do you see what isa wrong?

Second question: Is it common to group all the "from" statements at the top 
of the program
or to put them by the relavent code as I have here?

Thanks a lot


try:

#Or we can use the two commented statements

#from ffnet.tools import drawffnet

from ffnet.tools.drawffnet import drawffnet

import pylab

#drawffnet.drawffnet(nn)

drawffnet(nn)

pylab.show()

except ImportError, e:

print "Cannot make drawffnet plot.\n%s" % e


?

?

# Plot adapted from

# http://ffnet.sourceforge.net/examples/stock.html

# Make plot if matplotlib is avialble

try:

from pylab import *

plot( targets2, 'b--' )

plot( output, 'k-' )

legend(('target', 'output'))

xlabel('pattern'); ylabel('benign or malignant')

title('Outputs vs. target of trained network.')

grid(True)

show()

except ImportError, e:

print "Cannot make plots. For plotting install matplotlib.\n%s" % e



?

?




From CalWhoNOSPAM at roadrunner.com  Sun Mar 14 17:00:37 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Sun, 14 Mar 2010 17:00:37 -0400
Subject: What does Error: 'module' object is not callable Mean?
References: <hnj9ea$hdi$1@news.eternal-september.org>
	<mailman.745.1268592389.23598.python-list@python.org>
Message-ID: <hnjipo$kcf$1@news.eternal-september.org>


"MRAB" <python at mrabarnett.plus.com> wrote in message 
news:mailman.745.1268592389.23598.python-list at python.org...
>  Cal Who wrote:
>> The below code produces the error as indicated. But, in
>>  E:\Python26\Lib\site-packages\ffnet\tools I see:
>>     drawffnet.py
>>     drawffnet.pyc
>>     drawffnet.pyo
>> Is that what it is looking for?
>>
>> I'm not sure what "not callable" means.
>> Could it be referencing to "nn" rather than drawffnet?
>> What should I do to investigate this?
>>
>> Thanks
>> from ffnet import ffnet, mlgraph, readdata
>>
>> ...snipped working code here ...
>>
>> output, regression = nn.test(inputs2, targets2, iprint = 2)
>>
>> from ffnet.tools import drawffnet
>> import pylab
>> drawffnet(nn)   #Error: 'module' object is not callable
>> pylab.show()
>> except ImportError, e:
>> print "Cannot make drawffnet plot."
> You're importing the module 'drawffnet' and then trying to call it in:
>
>     drawffnet(nn)
>
> but, as the traceback says, modules can't be called.
>
> I had a quick look at the documentation and it looks like you should be
> calling a function called 'drawffnet' that's defined in the module
> called 'drawffnet'. Try doing:
>
>     from ffnet.tools.drawffnet import drawffnet
>
> instead.

Thanks, Works great - please see my other post 




From CalWhoNOSPAM at roadrunner.com  Sun Mar 14 17:01:46 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Sun, 14 Mar 2010 17:01:46 -0400
Subject: What does Error: 'module' object is not callable Mean?
References: <hnj9ea$hdi$1@news.eternal-september.org>
	<mailman.746.1268592481.23598.python-list@python.org>
Message-ID: <hnjirt$kvt$1@news.eternal-september.org>


"Terry Reedy" <tjreedy at udel.edu> wrote in message 
news:mailman.746.1268592481.23598.python-list at python.org...
> On 3/14/2010 2:20 PM,  Cal Who wrote:
>>
>> The below code produces the error as indicated. But, in
>>   E:\Python26\Lib\site-packages\ffnet\tools I see:
>>      drawffnet.py
>
> drawffnet is a module initialized from drawffnet.py (or either of the 
> below)
>
>>      drawffnet.pyc
>>      drawffnet.pyo
>> Is that what it is looking for?
>>
>> I'm not sure what "not callable" means.
>> Could it be referencing to "nn" rather than drawffnet?
>> What should I do to investigate this?
>>
>> Thanks
>> from ffnet import ffnet, mlgraph, readdata
>>
>> ...snipped working code here ...
>>
>> output, regression = nn.test(inputs2, targets2, iprint = 2)
>>
>> from ffnet.tools import drawffnet
>
> here you create drawffnet from one of the files.
>
>> import pylab
>> drawffnet(nn)   #Error: 'module' object is not callable
>
> This is an attempt to call the module as if it were a functions, which it 
> is not. You probably want to call a function within the module.
Exactly. Thanks it works now. Please see my other post.

>
>
>> pylab.show()
>> except ImportError, e:
>> print "Cannot make drawffnet plot."
>>
>>
>
> 




From ryan at rfk.id.au  Sun Mar 14 17:04:18 2010
From: ryan at rfk.id.au (Ryan Kelly)
Date: Mon, 15 Mar 2010 08:04:18 +1100
Subject: sqlite savepoint problem (was: Re: sqlite3 is sqlite 2?)
In-Reply-To: <4B99E358.4020507@shopzeus.com>
References: <mailman.752.1268596146.23598.python-list@python.org>
	<87bpeqzmmv.fsf@castleamber.com>  <4B99E358.4020507@shopzeus.com>
Message-ID: <1268600658.2846.17.camel@durian>

On Fri, 2010-03-12 at 07:46 +0100, Laszlo Nagy wrote:
> >
>  >>> import sqlite3
>  >>> conn = sqlite3.connect(':memory:')
>  >>> with conn:
> ...     conn.execute("BEGIN")
> ...     conn.execute("create table a ( i integer)")
> ...     conn.execute("insert into a values (1)")
> ...     conn.execute("savepoint sp1")
> ...     conn.execute("insert into a values(2)")
> ...     conn.execute("release sp1")
> ...     conn.execute("COMMIT")
> ...
> <sqlite3.Cursor object at 0xb7e29b30>
> <sqlite3.Cursor object at 0xb7e29b60>
> <sqlite3.Cursor object at 0xb7e29b30>
> <sqlite3.Cursor object at 0xb7e29b60>
> <sqlite3.Cursor object at 0xb7e29b30>
> Traceback (most recent call last):
>   File "<stdin>", line 7, in <module>
> sqlite3.OperationalError: no such savepoint: sp1
>  >>>
>
> The syntax is correct: http://www.sqlite.org/lang_savepoint.html
> The savepoint was really created.
> But I get this error, telling "no such savepoint". What is wrong here? 
> Maybe it has to do something with transaction isolation? :-s

From memory you can't issue a "CREATE TABLE" statement inside a
transaction, at least not at the default isolation level.  Such a
statement will automatically commit the current transaction.  Doesn't
help with your current problem but worth pointing out :-)

When debugging strange transaction behaviour, I find it easiest to
create the connection with isolation_level=None so that are no implicit
transactions being created behind your back.  Not sure why, but setting
this makes your example work for me.

  Ryan




-- 
Ryan Kelly
http://www.rfk.id.au  |  This message is digitally signed. Please visit
ryan at rfk.id.au        |  http://www.rfk.id.au/ramblings/gpg/ for details

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From nyamatongwe+thunder at gmail.com  Sun Mar 14 17:05:59 2010
From: nyamatongwe+thunder at gmail.com (Neil Hodgson)
Date: Sun, 14 Mar 2010 21:05:59 GMT
Subject: Python unicode and Windows cmd.exe
In-Reply-To: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>
References: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>
Message-ID: <Xccnn.13044$pv.137@news-server.bigpond.net.au>

Guillermo:

> I then open the file m.txt with notepad, and I see "ma?ana" normally.
> I save (again, no actual modifications), go back to the dos prompt, do
> type m.txt and this time it works! I get "ma?ana". When notepad opens
> the file, the encoding is already UTF-8, so short of a UTF-8 bom being
> added to the file, 

   That is what happens: the file now starts with a BOM \xEB\xBB\xBF as
you can see with a hex editor.

> I don't know what happens when I save the
> unmodified file. Also, I would think that the python script should
> save a valid utf-8 file in the first place...

   Its just as valid UTF-8 without a BOM. People have different opinions
on this but for compatibility, I think it is best to always start UTF-8
files with a BOM.

   Neil


From clp2 at rebertia.com  Sun Mar 14 17:17:55 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 14 Mar 2010 13:17:55 -0800
Subject: What does Error: 'module' object is not callable Mean?
In-Reply-To: <hnjimh$je1$1@news.eternal-september.org>
References: <hnj9ea$hdi$1@news.eternal-september.org>
	<hnjimh$je1$1@news.eternal-september.org>
Message-ID: <50697b2c1003141417q37a0c0dfga6ff3955eb0e42f1@mail.gmail.com>

On Sun, Mar 14, 2010 at 12:58 PM, Cal Who <CalWhoNOSPAM at roadrunner.com> wrote:
<snip>
> Second question: Is it common to group all the "from" statements at the top
> of the program
> or to put them by the relavent code as I have here?

The former.

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


From tjreedy at udel.edu  Sun Mar 14 17:19:33 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 14 Mar 2010 17:19:33 -0400
Subject: Some PyCon videos won't play
In-Reply-To: <hnjakh$mcv$1@dough.gmane.org>
References: <SNT106-W28E9678F29E5527CFCBB88B1300@phx.gbl>	<mailman.716.1268506909.23598.python-list@python.org>	<hniugj$b36$1@get-news01.get.basefarm.net>
	<hnjakh$mcv$1@dough.gmane.org>
Message-ID: <hnjjt5$jsk$1@dough.gmane.org>

On 3/14/2010 2:41 PM, Terry Reedy wrote:
> On 3/14/2010 11:14 AM, David Boddie wrote:

>> You should still be able to get at the videos themselves by inspecting
>> the page contents, looking for download links like this one:
>>
>> http://blip.tv/file/get/Pycon-PyCon2010UsingPythonToCreateRoboticSimulationsForPlaneta894.ogv
>>
>>
>> In this case, it's an Ogg Theora video file, so you may want to use
>> a player like VLC to view it:
>
> For people using html5 competant browsers, which, I believe, play .ogv
> 'in tha page', blip.tv just needs to update site to make html5 pages an
> alternative to using the flash player.

Actually, for FF3.6, at least, the problem is already solved. I just 
click on the download button and FF recognizes .ogv as something it can 
play and it does, replacing the flash player. The FF player lacks a 
full-screen button, but that is rarely needed for the talks.

tjr





From cmpython at gmail.com  Sun Mar 14 17:22:22 2010
From: cmpython at gmail.com (CM)
Date: Sun, 14 Mar 2010 14:22:22 -0700 (PDT)
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com> 
	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com> 
	<87fx443vgo.fsf@castleamber.com>
	<lpcop5d7qgc7a4qbdqu5jf4r5da1ojkqhj@4ax.com> 
	<87sk82zplj.fsf@castleamber.com>
	<r4gqp5du2f3gamdgkjeul4nag9sr3299v1@4ax.com>
Message-ID: <806f8246-3b3e-4468-b0e4-3c3f032a6f49@z4g2000yqa.googlegroups.com>

On Mar 14, 4:04?pm, David Monaghan <monaghand.da... at gmail.com> wrote:
> On Sun, 14 Mar 2010 13:10:32 -0600, John Bokma <j... at castleamber.com> wrote:
> >David Monaghan <monaghand.da... at gmail.com> writes:
>
> >> of Google. If they haven't used it, I don't really consider the gentle
> >> reminder that LMGTFY gives too harsh. If you do, you're too much of a gentle
> >> soul to be on the internet at all; someone might say "Boo" to you at any
> >> moment. Beware.
>
> Sorry. That last comment of mine was uncalled for.
>
> >I've no problem with lmgtfy. I *do* have a problem with hiding it behing
> >a tinyurl. Why use 2 levels of obfuscating in a group that's about
> >programming in a language that promotes clear coding?
>
> >The message would have been the same if the OP had just copy pasted the
> >Google link. But hey, that's way less "funny".
>
> Good point, although one could argue the unhidden response is just rude, but
> the masking does make it genuinely funny.
>
> DaveM

I thought the point of LMGTFY was to humorously and innocuously get
across the point that a lot of basic questions can be answered
instantly, or just a few key terms and a mouse click away (i.e. "Was
that so hard?") instead of having to write and post a message to a
group and then wait for responses.  In this sense, using LMGTFY *is* a
memorable transmission of information beyond just the answer to the
question.  It is the meta-information of how to "teach a man to
fish".  If someone "LMGTFY'ed" me due to my asking a really Googleable
question, I'd feel I deserved this gentle ribbing and would make a
note to be more diligent in my searches before asking a forum.



From guillermo.listas at googlemail.com  Sun Mar 14 17:22:46 2010
From: guillermo.listas at googlemail.com (Guillermo)
Date: Sun, 14 Mar 2010 14:22:46 -0700 (PDT)
Subject: Python unicode and Windows cmd.exe
References: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>
	<Xccnn.13044$pv.137@news-server.bigpond.net.au>
Message-ID: <4de2d54b-ecaa-44b0-973b-10138d42562c@r1g2000yqj.googlegroups.com>

> ? ?That is what happens: the file now starts with a BOM \xEB\xBB\xBF as
> you can see with a hex editor.

Is this an enforced convention under Windows, then? My head's aching
after so much pulling at my hair, but I have the feeling that the
problem only arises when text travels through the dos console...

Cheers,
Guillermo


From gatoygata2 at gmail.com  Sun Mar 14 17:25:12 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Sun, 14 Mar 2010 14:25:12 -0700 (PDT)
Subject: Python unicode and Windows cmd.exe
References: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>
	<Xccnn.13044$pv.137@news-server.bigpond.net.au>
	<4de2d54b-ecaa-44b0-973b-10138d42562c@r1g2000yqj.googlegroups.com>
Message-ID: <3193c95f-29c3-44e5-9ac9-23e00b3a33ff@m37g2000yqf.googlegroups.com>

On 14 mar, 22:22, Guillermo <guillermo.lis... at googlemail.com> wrote:
> > ? ?That is what happens: the file now starts with a BOM \xEB\xBB\xBF as
> > you can see with a hex editor.
>
> Is this an enforced convention under Windows, then? My head's aching
> after so much pulling at my hair, but I have the feeling that the
> problem only arises when text travels through the dos console...
>
> Cheers,
> Guillermo

search for BOM in wikipedia.
There it talks about notepad behavior.

ja


From nyamatongwe+thunder at gmail.com  Sun Mar 14 17:35:51 2010
From: nyamatongwe+thunder at gmail.com (Neil Hodgson)
Date: Sun, 14 Mar 2010 21:35:51 GMT
Subject: Python unicode and Windows cmd.exe
In-Reply-To: <4de2d54b-ecaa-44b0-973b-10138d42562c@r1g2000yqj.googlegroups.com>
References: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>
	<Xccnn.13044$pv.137@news-server.bigpond.net.au>
	<4de2d54b-ecaa-44b0-973b-10138d42562c@r1g2000yqj.googlegroups.com>
Message-ID: <XEcnn.13049$pv.4467@news-server.bigpond.net.au>

Guillermo:

> Is this an enforced convention under Windows, then? My head's aching
> after so much pulling at my hair, but I have the feeling that the
> problem only arises when text travels through the dos console...

   The console is commonly using Code Page 437 which is most compatible
with old DOS programs since it can display line drawing characters. You
can change the code page to UTF-8 with
chcp 65001
   Now, "type m.txt" with the original BOM-less file and it should be
OK. You may also need to change the console font to one that is Unicode
compatible like Lucida Console.

   Neil


From tjreedy at udel.edu  Sun Mar 14 17:37:29 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 14 Mar 2010 17:37:29 -0400
Subject: Python unicode and Windows cmd.exe
In-Reply-To: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>
References: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>
Message-ID: <hnjkuo$n16$1@dough.gmane.org>

On 3/14/2010 4:40 PM, Guillermo wrote:
> Hi,
>
> I would appreciate if someone could point out what am I doing wrong
> here.
>
> Basically, I need to save a string containing non-ascii characters to
> a file encoded in utf-8.
>
> If I stay in python, everything seems to work fine, but the moment I
> try to read the file with another Windows program, everything goes to
> hell.
>
> So here's the script unicode2file.py:
> ===================================================================
> # encoding=utf-8
> import codecs
>
> f = codecs.open("m.txt",mode="w", encoding="utf8")
> a = u"ma?ana"
> print repr(a)
> f.write(a)
> f.close()
>
> f = codecs.open("m.txt", mode="r", encoding="utf8")
> a = f.read()
> print repr(a)
> f.close()
> ===================================================================
>
> That gives the expected output, both calls to repr() yield the same
> result.
>
> But now, if I do type me.txt in cmd.exe, I get garbled characters
> instead of "?".
>
> I then open the file with my editor (Sublime Text), and I see "ma?ana"
> normally. I save (nothing to be saved, really), go back to the dos
> prompt, do type m.txt and I get again the same garbled characters.
>
> I then open the file m.txt with notepad, and I see "ma?ana" normally.
> I save (again, no actual modifications), go back to the dos prompt, do
> type m.txt and this time it works! I get "ma?ana". When notepad opens
> the file, the encoding is already UTF-8, so short of a UTF-8 bom being

There is no such thing as a utf-8 'byte order mark'. The concept is an 
oxymoron.

> added to the file, I don't know what happens when I save the
> unmodified file. Also, I would think that the python script should
> save a valid utf-8 file in the first place...

Adding the byte that some call a 'utf-8 bom' makes the file an invalid 
utf-8 file. However, I suspect that notepad wrote the file in the system 
encoding, which can encode n with tilde and which cmd.exe does 
understand. If you started with a file with encoded cyrillic, arabic, 
hindi, and chinese characters (for instance), I suspect you would get a 
different result.

tjr




From wolfgang.lipp at gmail.com  Sun Mar 14 17:40:07 2010
From: wolfgang.lipp at gmail.com (_wolf)
Date: Sun, 14 Mar 2010 14:40:07 -0700 (PDT)
Subject: Is it possible to use re2 from Python?
References: <f853ea28-b236-4a17-8ded-43e5fe455d47@a18g2000yqc.googlegroups.com>
	<mailman.757.1268599807.23598.python-list@python.org>
Message-ID: <827b3e77-6f2a-412f-bfc2-4b7c8747ddcb@g11g2000yqe.googlegroups.com>


i am afraid that thread goes straight perpendicular to what re2 is
supposed to be, or do. my suggestion for these folks would be to
create a new, clean interface to stop the violence that comes with the
Python ``re`` interface, and open the thing up so one can plug in
``re`` implementations as are needed. when i absolutely need a
feature, i can always go to the slower machine; simpler regular
expressions could be dealt with more efficiently.



From wolfgang.lipp at gmail.com  Sun Mar 14 17:40:34 2010
From: wolfgang.lipp at gmail.com (_wolf)
Date: Sun, 14 Mar 2010 14:40:34 -0700 (PDT)
Subject: Is it possible to use re2 from Python?
References: <f853ea28-b236-4a17-8ded-43e5fe455d47@a18g2000yqc.googlegroups.com>
	<mailman.737.1268590742.23598.python-list@python.org>
Message-ID: <0540f7d0-95f6-4b38-900d-dc25958ff232@g26g2000yqn.googlegroups.com>


> There's a recent thread about this on the python-dev list,

pointers? i searched but didn?t find anything.


From guillermo.listas at googlemail.com  Sun Mar 14 17:53:11 2010
From: guillermo.listas at googlemail.com (Guillermo)
Date: Sun, 14 Mar 2010 14:53:11 -0700 (PDT)
Subject: Python unicode and Windows cmd.exe
References: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>
	<Xccnn.13044$pv.137@news-server.bigpond.net.au>
	<4de2d54b-ecaa-44b0-973b-10138d42562c@r1g2000yqj.googlegroups.com>
	<XEcnn.13049$pv.4467@news-server.bigpond.net.au>
Message-ID: <82aa56e1-8000-40bd-96b0-859391dab2e1@q23g2000yqd.googlegroups.com>

> ? ?The console is commonly using Code Page 437 which is most compatible
> with old DOS programs since it can display line drawing characters. You
> can change the code page to UTF-8 with
> chcp 65001

That's another issue in my actual script. A twofold problem, actually:

1) For me chcp gives 850 and I'm relying on that to decode the bytes I
get back from the console.

I suppose this is bound to fail because another Windows installation
might have a different default codepage.

2) My script gets output from a Popen call (to execute a Powershell
script [new Windows shell language] from Python; it does make sense!).
I suppose changing the Windows codepage for a single Popen call isn't
straightforward/possible?

Right now, I only get the desired result if I decode the output from
Popen as "cp850".


From ryan at rfk.id.au  Sun Mar 14 18:13:51 2010
From: ryan at rfk.id.au (Ryan Kelly)
Date: Mon, 15 Mar 2010 09:13:51 +1100
Subject: sqlite savepoint problem
In-Reply-To: <4B99F1D1.2070202@shopzeus.com>
References: <mailman.752.1268596146.23598.python-list@python.org>
	<87bpeqzmmv.fsf@castleamber.com> <4B99E358.4020507@shopzeus.com>
	<1268600658.2846.17.camel@durian> <4B99EE05.8060505@shopzeus.com>
	<4B99F1D1.2070202@shopzeus.com>
Message-ID: <1268604831.2846.23.camel@durian>

On Fri, 2010-03-12 at 08:48 +0100, Laszlo Nagy wrote:
> >
> > I'm now confused. Also, I could not find anything about these 
> > isolation levels on the sqlite website. The only think I could find is 
> > "PRAGMA read_uncommited". If that is the same as setting 
> > isolation_level to None, then I don't want it.
> Yes, it is. Here is a test:

No it isn't.  The "magic" behind isolation_level is a creation of the
python sqlite bindings.  You can probably tell that I'm not a fan of it.

> import os
> import sqlite3
> import threading
> import time
> 
> FPATH = '/tmp/test.sqlite'
> if os.path.isfile(FPATH):
>     os.unlink(FPATH)
> 
> def getconn():
>     global FPATH
>     conn = sqlite3.connect(FPATH)
>     conn.isolation_level = None
>     return conn
> 
> class Thr1(threading.Thread):
>     def run(self):
>         conn = getconn()
>         print "Thr1: Inserting 0,1,2,3,4,5"
>         with conn:
>             for i in range(6):
>                 conn.execute("insert into a values (?)",[i])
>         print "Thr1: Commited"
>         with conn:
>             print "Thr1: Selecting all rows:"
>             for row in conn.execute("select * from a"):
>                 print row
>             print "Thr1: Wait some..."
>             time.sleep(3)
>             print "Thr1: Selecting again, in the same transaction"
>             for row in conn.execute("select * from a"):
>                 print row
> 
> 
> class Thr2(threading.Thread):
>     def run(self):
>         conn = getconn()
>         with conn:
>             print "Thr2: deleting all rows from a"
>             conn.execute("delete from a")
>             print "Thr2: Now we wait some BEFORE commiting changes."
>             time.sleep(3)
>             print "Thr2: Will roll back!"
>             raise Exception
> 
> 
> def main():
>     with getconn() as conn:
>         conn.execute("create table a ( i integer ) ")
>     thr1 = Thr1()
>     thr1.start()
>     time.sleep(1)
>     thr1 = Thr2()
>     thr1.start()
> 
> main()
> 
> 
> And the test result:
> 
> Thr1: Inserting 0,1,2,3,4,5
> Thr1: Commited
> Thr1: Selecting all rows:
> (0,)
> (1,)
> (2,)
> (3,)
> (4,)
> (5,)
> Thr1: Wait some...
> Thr2: deleting all rows from a
> Thr2: Now we wait some BEFORE commiting changes.
> Thr1: Selecting again, in the same transaction
> Thr2: Will roll back!
> Exception in thread Thread-2:
> Traceback (most recent call last):
>   File "/usr/lib/python2.6/threading.py", line 525, in __bootstrap_inner
>     self.run()
>   File "test.py", line 44, in run
>     raise Exception
> Exception
> 
> 
> It means that setting isolation_level to None will really allow 
> uncommited changes to be read by other transactions! This is sad, and of 
> course this is something that I do not want.


No it doesn't.  The problem is that using a connection as a context
manager doesn't do what you think. 

It does *not* start a new transaction on __enter__ and commit it on
__exit__.  As far as I can tell it does nothing on __enter__ and calls
con.commit() or con.rollback() on exit.  With isolation_level=None,
these are no-ops.

If you create your own connection wrapper that explicitly creates and
commits transactions, you example will work fine with
isolation_level=None.  Here's the relevant changes:


  class MyConn(sqlite3.Connection):
      def __enter__(self):
          self.execute("BEGIN")
          return self
      def __exit__(self,exc_type,exc_info,traceback):
          if exc_type is None:
              self.execute("COMMIT")
          else:
              self.execute("ROLLBACK")

  def getconn():
      global FPATH
      conn = sqlite3.connect(FPATH,factory=MyConn)
      conn.isolation_level = None
      return conn


  Cheers,

     Ryan


-- 
Ryan Kelly
http://www.rfk.id.au  |  This message is digitally signed. Please visit
ryan at rfk.id.au        |  http://www.rfk.id.au/ramblings/gpg/ for details

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From nyamatongwe+thunder at gmail.com  Sun Mar 14 18:15:41 2010
From: nyamatongwe+thunder at gmail.com (Neil Hodgson)
Date: Sun, 14 Mar 2010 22:15:41 GMT
Subject: Python unicode and Windows cmd.exe
In-Reply-To: <82aa56e1-8000-40bd-96b0-859391dab2e1@q23g2000yqd.googlegroups.com>
References: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>
	<Xccnn.13044$pv.137@news-server.bigpond.net.au>
	<4de2d54b-ecaa-44b0-973b-10138d42562c@r1g2000yqj.googlegroups.com>
	<XEcnn.13049$pv.4467@news-server.bigpond.net.au>
	<82aa56e1-8000-40bd-96b0-859391dab2e1@q23g2000yqd.googlegroups.com>
Message-ID: <hednn.13050$pv.10703@news-server.bigpond.net.au>

Guillermo:

> 2) My script gets output from a Popen call (to execute a Powershell
> script [new Windows shell language] from Python; it does make sense!).
> I suppose changing the Windows codepage for a single Popen call isn't
> straightforward/possible?

   You could try SetConsoleOutputCP and SetConsoleCP.

   Neil


From guillermo.listas at googlemail.com  Sun Mar 14 18:21:11 2010
From: guillermo.listas at googlemail.com (Guillermo)
Date: Sun, 14 Mar 2010 15:21:11 -0700 (PDT)
Subject: Python unicode and Windows cmd.exe
References: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>
	<Xccnn.13044$pv.137@news-server.bigpond.net.au>
	<4de2d54b-ecaa-44b0-973b-10138d42562c@r1g2000yqj.googlegroups.com>
	<XEcnn.13049$pv.4467@news-server.bigpond.net.au>
	<82aa56e1-8000-40bd-96b0-859391dab2e1@q23g2000yqd.googlegroups.com>
Message-ID: <7f81925a-01f3-4d69-b67e-725bd176e440@z4g2000yqa.googlegroups.com>

> 2) My script gets output from a Popen call (to execute a Powershell
> script [new Windows shell language] from Python; it does make sense!).
> I suppose changing the Windows codepage for a single Popen call isn't
> straightforward/possible?

Nevermind. I'm able to change Windows' codepage to 65001 from within
the Powershell script and I get back a string encoded in UTF-8 with
BOM, so problem solved!

Thanks for the help,
Guillermo


From CalWhoNOSPAM at roadrunner.com  Sun Mar 14 18:49:48 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Sun, 14 Mar 2010 18:49:48 -0400
Subject: What does Error: 'module' object is not callable Mean?
References: <hnj9ea$hdi$1@news.eternal-september.org>
	<hnjimh$je1$1@news.eternal-september.org>
Message-ID: <hnjp6f$l4$1@news.eternal-september.org>

I cleaned up the code by moving all the imports to the top.
 There are two plotting routines shown below.
 Either one will work without error.
 But when I include both,  running produces:
 The exception unknown software exception (0x40000015) occurred in the
 application at location 0x1e05b62a.
 In a dialog box and the following in the console:
 Fatal Python error: PyEval_RestoreThread: NULL tstate
  This application has requested the Runtime to terminate it in an unusual
 way.
  Please contact the application's support team for more information.

 Do you see what is wrong?

 Thanks a lot

from pylab import plot, legend, title, grid, show, xlabel, ylabel
...snip....

#FIRST PLOT
plot( targets2, 'b--' )
plot( output, 'k-' )
legend(('target', 'output'))
xlabel('pattern'); ylabel('benign or malignant')
title('Outputs vs. target of trained network.')
grid(True)
show()

#SECOND PLOT
drawffnet(nn)
show() 




From missive at hotmail.com  Sun Mar 14 19:06:19 2010
From: missive at hotmail.com (Lee Harr)
Date: Mon, 15 Mar 2010 03:36:19 +0430
Subject: [ANNC] pynguin-0.4 (python turtle graphics application)
Message-ID: <SNT106-W10175CEB52F64D3CF69EEBB12F0@phx.gbl>


Pynguin is a python-based turtle graphics application.
??? It combines an editor, interactive interpreter, and
??? graphics display area.

It is meant to be an easy environment for introducing
??? some programming concepts to beginning programmers.


http://pynguin.googlecode.com/


This release continues adding basic functionality and
??? refining the interface. If you are interested, please
??? take a look and let me know what you think.


Pynguin is tested with Python 2.6.4 and uses PyQt (4.6)
??? for its GUI elements. Pynguin is released under GPLv3.


Changes in pynguin-0.4:
??? - improved document switcher
??? - added easy 'random' color access
??? - added new commands
??????? - onscreen
??????? - onclick
??????? - stamp
??????? - viewcoords
??? - winding fill now default
??????? - added method to switch between winding/oddeven fill
??? - show file name in window header
??? - more examples
??? - added default values for examples that take parameters
??? - fixed star example for even number of sides
??? - fixed crash when changing to alternate view image
??? - fixed problem running code with blank lines
??? - fixed problem with ctrl key getting stuck on
??? - added bug report option in Help menu
??? - allow keypad Enter same as Return
??? - factored in to multiple files

Changes in pynguin-0.3:
??? - added new commands
??????? - goto
??????? - turnto
??????? - lineto
??????? - distance
??????? - toward
??????? - write
??? - added more examples
??? - fixed problem when changing speed while code is running
??? - editor auto-indent improvement

 		 	   		  
_________________________________________________________________
Hotmail: Powerful Free email with security by Microsoft.
https://signup.live.com/signup.aspx?id=60969


From ryan at rfk.id.au  Sun Mar 14 19:16:19 2010
From: ryan at rfk.id.au (Ryan Kelly)
Date: Mon, 15 Mar 2010 10:16:19 +1100
Subject: sqlite savepoint problem
In-Reply-To: <4B99EE05.8060505@shopzeus.com>
References: <mailman.752.1268596146.23598.python-list@python.org>
	<87bpeqzmmv.fsf@castleamber.com>  <4B99E358.4020507@shopzeus.com>
	<1268600658.2846.17.camel@durian>  <4B99EE05.8060505@shopzeus.com>
Message-ID: <1268608579.2846.34.camel@durian>

On Fri, 2010-03-12 at 08:32 +0100, Laszlo Nagy wrote:
> > From memory you can't issue a "CREATE TABLE" statement inside a
> > transaction, at least not at the default isolation level.  Such a
> > statement will automatically commit the current transaction.  Doesn't
> > help with your current problem but worth pointing out :-)
> >   
> Thank you. I'll keep in mind.
> > When debugging strange transaction behaviour, I find it easiest to
> > create the connection with isolation_level=None so that are no implicit
> > transactions being created behind your back.  Not sure why, but setting
> > this makes your example work for me.
> >   
> Yes, same for me. But setting it to None means auto commit mode! See here:
> 
> http://docs.python.org/library/sqlite3.html#sqlite3-controlling-transactions
> 
> 
> But it does not work that way. Look at this example
> 
> import sqlite3
> 
> conn = sqlite3.connect(':memory:')
> conn.isolation_level = None
> with conn:
>     conn.execute("create table a ( i integer ) ")
> 
> with conn:
>     conn.execute("insert into a values (1)")
>     conn.execute("SAVEPOINT sp1")
>     conn.execute("insert into a values (2)")
>     conn.execute("SAVEPOINT sp2")
>     conn.execute("insert into a values (3)")
>     conn.execute("ROLLBACK TO sp2")
>     conn.execute("insert into a values (4)")
>     conn.execute("RELEASE sp1")
> 
> with conn:
>     for row in conn.execute("select * from a"):
>         print row
>        
> 
> It prints:
> 
> (1,)
> (2,)
> (4,)
> 
> So everything is working. Nothing is auto commited. But if I change it 
> to "DEFERRED" or "IMMEDIATE" or "EXCLUSIVE" then it won't work. Why?

I have a theory, based on a quick perusal of the sqlite3 bindings
source.

The bindings think that "SAVEPOINT sp1" is a "non-DML, non-query"
statement. So when isolation_level is something other than None, this
statement implicitly commits the current transaction and throws away
your savepoints!

Annotating your example:

  # entering this context actually does nothing
  with conn:
     # a transaction is magically created before this statement
     conn.execute("insert into a values (1)")
     # and is implicitly committed before this statement
     conn.execute("SAVEPOINT sp1")
     # a new transaction is magically created
     conn.execute("insert into a values (2)")
     # and committed, discarding the first savepoint.
     conn.execute("SAVEPOINT sp2")
     # a new transaction is magically created
     conn.execute("insert into a values (3)")
     # and committed, discarding the very savepoint we are trying to use. 
     conn.execute("ROLLBACK TO sp2")
     conn.execute("insert into a values (4)")
     conn.execute("RELEASE sp1")


In your previous multi-threaded example, try adding a "SAVEPOINT sp1"
statement after deleting the rows in Thread2.  You'll see that the
delete is immediately committed and the rows cannot be read back by
Thread1.  (modified version attached for convenience).


  Cheers,

     Ryan

-- 
Ryan Kelly
http://www.rfk.id.au  |  This message is digitally signed. Please visit
ryan at rfk.id.au        |  http://www.rfk.id.au/ramblings/gpg/ for details

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From steve at REMOVE-THIS-cybersource.com.au  Sun Mar 14 19:18:28 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 14 Mar 2010 23:18:28 GMT
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
	<87fx443vgo.fsf@castleamber.com>
	<lpcop5d7qgc7a4qbdqu5jf4r5da1ojkqhj@4ax.com>
	<87sk82zplj.fsf@castleamber.com>
	<r4gqp5du2f3gamdgkjeul4nag9sr3299v1@4ax.com>
	<87fx42zms9.fsf@castleamber.com>
Message-ID: <4b9d6ec4$0$27822$c3e8da3@news.astraweb.com>

On Sun, 14 Mar 2010 14:11:18 -0600, John Bokma wrote:

> One could argue, sure. But to me it's just the same as posting GFY
> (don't want to upset the tender soulds again with "the F-word".

Are you *still* going on about this thing? Sheesh.

You've made your point. You don't think posting links to Let Me Google 
That For You is friendly; you think that "hiding" those links behind 
tinyurl is downright hostile; and you think that heaping abuse and 
obscenities on the person who posted the link is acceptable behaviour.

You've made it abundantly clear that your concern about keeping this 
group friendly only applies to others, not to you. Can we move on now?



-- 
Steven



From CalWhoNOSPAM at roadrunner.com  Sun Mar 14 19:37:00 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Sun, 14 Mar 2010 19:37:00 -0400
Subject: What does Error: 'module' object is not callable Mean?
References: <hnj9ea$hdi$1@news.eternal-september.org>
	<hnjimh$je1$1@news.eternal-september.org>
	<hnjp6f$l4$1@news.eternal-september.org>
Message-ID: <hnjruu$ho2$1@news.eternal-september.org>

I found it. Had to use "figure" to create a new figure!


" Cal Who" <CalWhoNOSPAM at roadrunner.com> wrote in message 
news:hnjp6f$l4$1 at news.eternal-september.org...
>I cleaned up the code by moving all the imports to the top.
> There are two plotting routines shown below.
> Either one will work without error.
> But when I include both,  running produces:
> The exception unknown software exception (0x40000015) occurred in the
> application at location 0x1e05b62a.
> In a dialog box and the following in the console:
> Fatal Python error: PyEval_RestoreThread: NULL tstate
>  This application has requested the Runtime to terminate it in an unusual
> way.
>  Please contact the application's support team for more information.
>
> Do you see what is wrong?
>
> Thanks a lot
>
> from pylab import plot, legend, title, grid, show, xlabel, ylabel
> ...snip....
>
> #FIRST PLOT
> plot( targets2, 'b--' )
> plot( output, 'k-' )
> legend(('target', 'output'))
> xlabel('pattern'); ylabel('benign or malignant')
> title('Outputs vs. target of trained network.')
> grid(True)
> show()
>
> #SECOND PLOT
> drawffnet(nn)
> show()
> 




From tjreedy at udel.edu  Sun Mar 14 19:39:46 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 14 Mar 2010 19:39:46 -0400
Subject: Understanding the CPython dict implementation
Message-ID: <hnjs41$bt6$1@dough.gmane.org>

I found this PyCon2010 presentation to be excellent:
The Mighty Dictionary, Branden Craig Rhodes, 30 min.
http://pycon.blip.tv/file/3264041/

Even knowing Python for over a decade, I learned a few things.

Terry Jan Reedy



From metolone+gmane at gmail.com  Sun Mar 14 20:02:15 2010
From: metolone+gmane at gmail.com (Mark Tolonen)
Date: Sun, 14 Mar 2010 17:02:15 -0700
Subject: Python unicode and Windows cmd.exe
References: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>
	<hnjkuo$n16$1@dough.gmane.org>
Message-ID: <hnjte5$f06$1@dough.gmane.org>


"Terry Reedy" <tjreedy at udel.edu> wrote in message 
news:hnjkuo$n16$1 at dough.gmane.org...
On 3/14/2010 4:40 PM, Guillermo wrote:
> Adding the byte that some call a 'utf-8 bom' makes the file an invalid 
> utf-8 file.

Not true.  From http://unicode.org/faq/utf_bom.html:

Q: When a BOM is used, is it only in 16-bit Unicode text?
A: No, a BOM can be used as a signature no matter how the Unicode text is 
transformed: UTF-16, UTF-8, UTF-7, etc. The exact bytes comprising the BOM 
will be whatever the Unicode character FEFF is converted into by that 
transformation format. In that form, the BOM serves to indicate both that it 
is a Unicode file, and which of the formats it is in. Examples:
BytesEncoding Form
00 00 FE FF UTF-32, big-endian
FF FE 00 00 UTF-32, little-endian
FE FF            UTF-16, big-endian
FF FE            UTF-16, little-endian
EF BB BF      UTF-8

-Mark




From alfps at start.no  Sun Mar 14 20:37:04 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Mon, 15 Mar 2010 01:37:04 +0100
Subject: Python unicode and Windows cmd.exe
In-Reply-To: <mailman.769.1268611351.23598.python-list@python.org>
References: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>	<hnjkuo$n16$1@dough.gmane.org>
	<mailman.769.1268611351.23598.python-list@python.org>
Message-ID: <hnjvfk$b83$1@news.eternal-september.org>

* Mark Tolonen:
> 
> "Terry Reedy" <tjreedy at udel.edu> wrote in message 
> news:hnjkuo$n16$1 at dough.gmane.org...
> On 3/14/2010 4:40 PM, Guillermo wrote:
>> Adding the byte that some call a 'utf-8 bom' makes the file an invalid 
>> utf-8 file.
> 
> Not true.  From http://unicode.org/faq/utf_bom.html:
> 
> Q: When a BOM is used, is it only in 16-bit Unicode text?
> A: No, a BOM can be used as a signature no matter how the Unicode text 
> is transformed: UTF-16, UTF-8, UTF-7, etc. The exact bytes comprising 
> the BOM will be whatever the Unicode character FEFF is converted into by 
> that transformation format. In that form, the BOM serves to indicate 
> both that it is a Unicode file, and which of the formats it is in. 
> Examples:
> BytesEncoding Form
> 00 00 FE FF UTF-32, big-endian
> FF FE 00 00 UTF-32, little-endian
> FE FF            UTF-16, big-endian
> FF FE            UTF-16, little-endian
> EF BB BF      UTF-8

Well, technically true, and Terry was wrong about "There is no such thing as a 
utf-8 'byte order mark'. The concept is an oxymoron.". It's true that as a 
descriptive term "byte order mark" is an oxymoron for UTF-8. But in this 
particular context it's not a descriptive term, and it's not only technically 
allowed, as you point out, but sometimes required.

However, some tools are unable to process UTF-8 files with BOM.

The most annoying example is the GCC compiler suite, in particular g++, which in 
its Windows MinGW manifestation insists on UTF-8 source code without BOM, while 
Microsoft's compiler needs the BOM to recognize the file as UTF-8  --  the only 
way I found to satisfy both compilers, apart from a restriction to ASCII or 
perhaps Windows ANSI with wide character literals restricted to ASCII 
(exploiting a bug in g++ that lets it handle narrow character literals with 
non-ASCII chars) is to preprocess the source code. But that's not a general 
solution since the g++ preprocessor, via another bug, accepts some constructs 
(which then compile nicely) which the compiler doesn't accept when explicit 
preprocessing isn't used. So it's a mess.


Cheers,

- Alf


From pmaupin at gmail.com  Sun Mar 14 22:07:41 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sun, 14 Mar 2010 19:07:41 -0700 (PDT)
Subject: iterator/generator
References: <db51dbb8-920a-405a-8ddc-2a734f7140ac@q21g2000yqm.googlegroups.com>
Message-ID: <ba7a983b-1fc5-4a12-af0b-5fc9c64f7717@33g2000yqj.googlegroups.com>

First of all, as Steve Holden mentioned, do look at xlrd.  It's
awesome.

Second, for your (a) question, if you want an iterator, that's quite
easy:

matriz = iter(matriz)
matriz.next()  # Discard the first one
for i in matriz:

This technique works really well, especially if you have sub-loops.
Then, if you use a defaultdict which uses a list for a constructor

    for i in matriz:
        if i[a] and i[b]:
            g[i[a]].append(i[b])

HTH,
Pat


From timr at probo.com  Sun Mar 14 22:14:56 2010
From: timr at probo.com (Tim Roberts)
Date: Sun, 14 Mar 2010 19:14:56 -0700
Subject: result of os.times() is different with 'time' command Options
References: <16861cbc-4460-4d67-ab46-ff03517173d4@g8g2000pri.googlegroups.com>
Message-ID: <fc5rp5th2qkdadi43h1hsjoimh4e88nvp4@4ax.com>

hiral <hiralsmaillist at gmail.com> wrote:
>...
>Output:
>real    0.0m0.0100000002421s
>user    0.0m0.0s
>sys     0.0m0.0s
>
>
>Command:
>$ time ls
>
>Output:
>real    0m0.007s
>user    0m0.000s
>sys     0m0.000s
>
>
>Is this the intended behaviour?

What is it that you are wondering about?  The formatting difference is due
to your code.  The difference between 10 milliseconds and 7 milliseconds
could be due to any number of things.  First, you have the overhead of
Python involved in your measurements.  Second, you have the variability of
memory caching and disk caching.  Your Python code causes /bin/ls to be
loaded into memory, and it's probably still in a file cache when you run
the second command.

You can't really do an analysis like this with a task that only takes a few
milliseconds.  There are too many variables.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From mehgcap at gmail.com  Sun Mar 14 23:43:35 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Sun, 14 Mar 2010 23:43:35 -0400
Subject: dll in project?
Message-ID: <bc7f680c1003142043y78505aa3jb5e70360a692ebc8@mail.gmail.com>

Hi all,
I have a dll I am trying to use, but I get a Windows error 126, "the
specified module could not be found". Here is the code segment:
nvdaController=ctypes.windll.LoadLibrary("nvdaControllerClient32.dll") 	

I have the specified dll file in the same directory as the file trying
to use said dll, and this is the only reference I make to the dll. Do
I need to register it somehow? If so, does this need to be done once,
or each time the application runs? If I need to register it, how would
I do so? Thanks!
-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From nagle at animats.com  Mon Mar 15 00:05:36 2010
From: nagle at animats.com (John Nagle)
Date: Sun, 14 Mar 2010 21:05:36 -0700
Subject: Are there in Python some static web site generating tools like
	webgen, nanoc or webby in Ruby ?
In-Reply-To: <mailman.502.1268154912.23598.python-list@python.org>
References: <mailman.502.1268154912.23598.python-list@python.org>
Message-ID: <4b9dad7c$0$1639$742ec2ed@news.sonic.net>

     The HTMLTemplate module is useful for static web page generation.
It doesn't do much.  It's not a "content management system".
If you just need to generate a page with some data items filled in, it's fine.
If you need more than that, there are bigger packages, but they have more
baggage.

					John Nagle


From nagle at animats.com  Mon Mar 15 00:06:48 2010
From: nagle at animats.com (John Nagle)
Date: Sun, 14 Mar 2010 21:06:48 -0700
Subject: Understanding the CPython dict implementation
In-Reply-To: <mailman.768.1268610003.23598.python-list@python.org>
References: <mailman.768.1268610003.23598.python-list@python.org>
Message-ID: <4b9dadc4$0$1639$742ec2ed@news.sonic.net>

Terry Reedy wrote:
> I found this PyCon2010 presentation to be excellent:
> The Mighty Dictionary, Branden Craig Rhodes, 30 min.
> http://pycon.blip.tv/file/3264041/
> 
> Even knowing Python for over a decade, I learned a few things.
> 
> Terry Jan Reedy

    Is this available as a paper?

				John Nagle


From alfps at start.no  Mon Mar 15 00:19:41 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Mon, 15 Mar 2010 05:19:41 +0100
Subject: dll in project?
In-Reply-To: <mailman.770.1268624619.23598.python-list@python.org>
References: <mailman.770.1268624619.23598.python-list@python.org>
Message-ID: <hnkch1$9ln$1@news.eternal-september.org>

* Alex Hall:
> Hi all,
> I have a dll I am trying to use, but I get a Windows error 126, "the
> specified module could not be found". Here is the code segment:
> nvdaController=ctypes.windll.LoadLibrary("nvdaControllerClient32.dll") 	
> 
> I have the specified dll file in the same directory as the file trying
> to use said dll, and this is the only reference I make to the dll. Do
> I need to register it somehow? If so, does this need to be done once,
> or each time the application runs? If I need to register it, how would
> I do so? Thanks!

If 'ctypes.windll.LoadLibrary' just calls the Windows API LoadLibrary function 
without adding any path, then the directories considered will only be those 
known to the Windows API, like e.g. the process' current directory (I'm not sure 
if the current directory is considered, but the details aren't important).

And most likely your calling script file is not in any of those directories.

Probably it will work to specify the full path to the DLL. You can obtain the 
path to the calling file's directory by using the __file__ variable and the 
'os.path' functions.


Cheers & hth.,

- Alf


From alfps at start.no  Mon Mar 15 00:24:46 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Mon, 15 Mar 2010 05:24:46 +0100
Subject: File existence check with partial filename
In-Reply-To: <C7C2FE43.5AB0%Sang-Ho.Yun@jpl.nasa.gov>
References: <C7C2FE43.5AB0%Sang-Ho.Yun@jpl.nasa.gov>
Message-ID: <hnkcqh$avd$1@news.eternal-september.org>

* Sang-Ho Yun:
> I learned that I can check the existence of a file using
> os.path.isfile("filename").
> 
> What if I need to check if there is a file that contains "HV" in the
> filename?  What should I do?

<code>
     from __future__ import print_function
     import os

     for filename in os.listdir( "." ):
         if "HV" in filename.upper():
             print( filename )
</code>


Cheers & hth.,

- Alf


From gherron at islandtraining.com  Mon Mar 15 00:29:26 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Sun, 14 Mar 2010 21:29:26 -0700
Subject: File existence check with partial filename
In-Reply-To: <hnkcqh$avd$1@news.eternal-september.org>
References: <C7C2FE43.5AB0%Sang-Ho.Yun@jpl.nasa.gov>
	<hnkcqh$avd$1@news.eternal-september.org>
Message-ID: <4B9DB7A6.2010802@islandtraining.com>

Alf P. Steinbach wrote:
> * Sang-Ho Yun:
>> I learned that I can check the existence of a file using
>> os.path.isfile("filename").
>>
>> What if I need to check if there is a file that contains "HV" in the
>> filename?  What should I do?
>
> <code>
>     from __future__ import print_function
>     import os
>
>     for filename in os.listdir( "." ):
>         if "HV" in filename.upper():
>             print( filename )
> </code>
>
>
> Cheers & hth.,
>
> - Alf

Or learn the glob module.  It allows you to ask for a list of files 
matching a pattern that can include wildcard characters  -- probably 
"*HV*" for your case.

Gary Herron



From Sang-Ho.Yun at jpl.nasa.gov  Mon Mar 15 00:57:39 2010
From: Sang-Ho.Yun at jpl.nasa.gov (Sang-Ho Yun)
Date: Sun, 14 Mar 2010 20:57:39 -0800
Subject: File existence check with partial filename
Message-ID: <C7C2FE43.5AB0%Sang-Ho.Yun@jpl.nasa.gov>

I learned that I can check the existence of a file using
os.path.isfile("filename").

What if I need to check if there is a file that contains "HV" in the
filename?  What should I do?

Thank you,
Sang-Ho



From jgardner at jonathangardner.net  Mon Mar 15 00:57:58 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Sun, 14 Mar 2010 21:57:58 -0700
Subject: NoSQL Movement?
In-Reply-To: <20100314095513.61b0fbaa.darcy@druid.net>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<mailman.256.1267655008.23598.python-list@python.org>
	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
	<6cc20cea1003120105j626cc519o2271106e088b2e90@mail.gmail.com>
	<mailman.664.1268404115.23598.python-list@python.org>
	<7xljdx73a9.fsf@ruckus.brouhaha.com>
	<6cc20cea1003132342s6daefa43m6839a35bff37e0bb@mail.gmail.com>
	<20100314095513.61b0fbaa.darcy@druid.net>
Message-ID: <6cc20cea1003142157h21a1cf22o58899265cd28964f@mail.gmail.com>

On Sun, Mar 14, 2010 at 6:55 AM, D'Arcy J.M. Cain <darcy at druid.net> wrote:
> On Sat, 13 Mar 2010 23:42:31 -0800
> Jonathan Gardner <jgardner at jonathangardner.net> wrote:
>> On Fri, Mar 12, 2010 at 11:23 AM, Paul Rubin <no.email at nospam.invalid> wrote:
>> > "D'Arcy J.M. Cain" <darcy at druid.net> writes:
>> >> Just curious, what database were you using that wouldn't keep up with
>> >> you? ?I use PostgreSQL and would never consider going back to flat
>> >> files.
>> >
>> > Try making a file with a billion or so names and addresses, then
>> > compare the speed of inserting that many rows into a postgres table
>> > against the speed of copying the file.
>
> That's a straw man argument. ?Copying an already built database to
> another copy of the database won't be significantly longer than copying
> an already built file. ?In fact, it's the same operation.
>

I don't understand what you're trying to get at.

Each bit of data follows a particular path through the system. Each
bit of data has its own requirements for availability and consistency.
No, relational DBs don't have the same performance characteristic as
other data systems because they do different things.

If you have data that fits a particular style well, then I suggest
using that style to manage that data.

Let's say I had data that needs to hang around for a little while then
disappear into the archives. Let's say you hardly ever do random
access on this data because you always work with it serially or in
large batches. This is exactly like the recipient d

>> Also consider how much work it is to partition data from flat files
>> versus PostgreSQL tables.
>
> Another straw man. ?I'm sure you can come up with many contrived
> examples to show one particular operation faster than another.
> Benchmark writers (bad ones) do it all the time. ?I'm saying that in
> normal, real world situations where you are collecting billions of data
> points and need to actually use the data that a properly designed
> database running on a good database engine will generally be better than
> using flat files.
>

You're thinking in the general. Yes, RDBMs do wonderful things in the
general cases. However, in very specific circumstances, RDBMS do a
whole lot worse.

Think of the work involved in sharding an RDBMS instance. You need to
properly implement two-phase commit above and beyond the normal work
involved. I haven't run into a multi-master replication system that is
trivial. When you find one, let me know, because I'm sure there are
caveats and corner cases that make things really hard to get right.

Compare this to simply distributing flat files to one of many
machines. It's a whole lot easier to manage and easier to understand,
explain, and implement.

You should use the right tool for the job. Sometimes the data doesn't
fit the profile of an RDBMs, or the RDBMs overhead makes managing the
data more difficult than it needs to be. In those cases, it makes a
whole lot of sense to try something else out.

>> >> The only thing I can think of that might make flat files faster is
>> >> that flat files are buffered whereas PG guarantees that your
>> >> information is written to disk before returning
>> >
>> > Don't forget all the shadow page operations and the index operations,
>> > and that a lot of these operations require reading as well as writing
>> > remote parts of the disk, so buffering doesn't help avoid every disk
>> > seek.
>
> Not sure what a "shadow page operation" is but index operations are
> only needed if you have to have fast access to read back the data. ?If
> it doesn't matter how long it takes to read the data back then don't
> index it. ?I have a hard time believing that anyone would want to save
> billions of data points and not care how fast they can read selected
> parts back or organize the data though.
>

I don't care how the recipients for the email campaign were indexed. I
don't need an index because I don't do random accesses. I simply need
the list of people I am going to send the email campaign to, properly
filtered and de-duped, of course. This doesn't have to happen within
the database. There are wonderful tools like "sort" and "uniq" to do
this work for me, far faster than an RDBMS can do it. In fact, I don't
think you can come up with a faster solution than "sort" and "uniq".

>> Plus the fact that your other DB operations slow down under the load.
>
> Not with the database engines that I use. ?Sure, speed and load are
> connected whether you use databases or flat files but a proper database
> will scale up quite well.
>

I know for a fact that "sort" and "uniq" are far faster than any
RDBMs. The reason why is obvious.

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From efiish at gmail.com  Mon Mar 15 02:44:38 2010
From: efiish at gmail.com (Lan Qing)
Date: Mon, 15 Mar 2010 14:44:38 +0800
Subject: Fwd: Some PyCon videos won't play
In-Reply-To: <hnjjt5$jsk$1@dough.gmane.org>
References: <SNT106-W28E9678F29E5527CFCBB88B1300@phx.gbl>
	<mailman.716.1268506909.23598.python-list@python.org>
	<hniugj$b36$1@get-news01.get.basefarm.net>
	<hnjakh$mcv$1@dough.gmane.org> <hnjjt5$jsk$1@dough.gmane.org>
Message-ID: <ee9ad2071003142344w7aa3607di24639a5c5b7c4aaf@mail.gmail.com>

In China these video can not watch at all. I must spent 3 days to download
it...

On Mon, Mar 15, 2010 at 5:19 AM, Terry Reedy <tjreedy at udel.edu> wrote:

> On 3/14/2010 2:41 PM, Terry Reedy wrote:
>
>> On 3/14/2010 11:14 AM, David Boddie wrote:
>>
>
>  You should still be able to get at the videos themselves by inspecting
>>> the page contents, looking for download links like this one:
>>>
>>>
>>> http://blip.tv/file/get/Pycon-PyCon2010UsingPythonToCreateRoboticSimulationsForPlaneta894.ogv
>>>
>>>
>>> In this case, it's an Ogg Theora video file, so you may want to use
>>> a player like VLC to view it:
>>>
>>
>> For people using html5 competant browsers, which, I believe, play .ogv
>> 'in tha page', blip.tv just needs to update site to make html5 pages an
>> alternative to using the flash player.
>>
>
> Actually, for FF3.6, at least, the problem is already solved. I just click
> on the download button and FF recognizes .ogv as something it can play and
> it does, replacing the flash player. The FF player lacks a full-screen
> button, but that is rarely needed for the talks.
>
> tjr
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From hiralsmaillist at gmail.com  Mon Mar 15 02:51:28 2010
From: hiralsmaillist at gmail.com (hiral)
Date: Sun, 14 Mar 2010 23:51:28 -0700 (PDT)
Subject: result of os.times() is different with 'time' command Options
References: <16861cbc-4460-4d67-ab46-ff03517173d4@g8g2000pri.googlegroups.com>
	<fc5rp5th2qkdadi43h1hsjoimh4e88nvp4@4ax.com>
Message-ID: <61c563ad-f0c3-47ae-b689-36c397f88295@l11g2000pro.googlegroups.com>

On Mar 15, 7:14?am, Tim Roberts <t... at probo.com> wrote:
> hiral<hiralsmaill... at gmail.com> wrote:
> >...
> >Output:
> >real ? ?0.0m0.0100000002421s
> >user ? ?0.0m0.0s
> >sys ? ? 0.0m0.0s
>
> >Command:
> >$ time ls
>
> >Output:
> >real ? ?0m0.007s
> >user ? ?0m0.000s
> >sys ? ? 0m0.000s
>
> >Is this the intended behaviour?
>
> What is it that you are wondering about? ?The formatting difference is due
> to your code. ?The difference between 10 milliseconds and 7 milliseconds
> could be due to any number of things. ?First, you have the overhead of
> Python involved in your measurements. ?Second, you have the variability of
> memory caching and disk caching. ?Your Python code causes /bin/ls to be
> loaded into memory, and it's probably still in a file cache when you run
> the second command.
>
> You can't really do an analysis like this with a task that only takes a few
> milliseconds. ?There are too many variables.
> --
> Tim Roberts, t... at probo.com
> Providenza & Boekelheide, Inc.- Hide quoted text -
>
> - Show quoted text -

Thanks for your explanation.


From hiralsmaillist at gmail.com  Mon Mar 15 02:51:42 2010
From: hiralsmaillist at gmail.com (hiral)
Date: Sun, 14 Mar 2010 23:51:42 -0700 (PDT)
Subject: to create variable from dict
References: <4859ed52-7276-4617-b25e-902b52cfe7c5@s36g2000prh.googlegroups.com>
	<ecc59606-b4c2-418f-9cb2-27e9b2c47714@o30g2000yqb.googlegroups.com> 
	<mailman.666.1268406201.23598.python-list@python.org>
Message-ID: <dd2d779d-cfa3-464a-aceb-5cb1b7aa85ab@l24g2000prh.googlegroups.com>

On Mar 12, 8:02?pm, Jean-Michel Pichavant <jeanmic... at sequans.com>
wrote:
> Luis M. Gonz?lez wrote:
> > On Mar 12, 10:59 am,hiral<hiralsmaill... at gmail.com> wrote:
>
> >> Hi,
>
> >> Is there any way to create variables which name matches with dict key?
>
> >> For example:
> >> dict1 = {"abc":'1", "def":"2"}
>
> >> Now I am looking to have variable name abc and it's value be '1' etc.
>
> >> Pl. suggest.
>
> >> Thank you.
>
> > Check out this thread (very recent):
> >http://groups.google.com/group/comp.lang.python/browse_thread/thread/...
>
> > Short answer: you can update globals() with a dictionary, as follows:
>
> > globals().update( dict1 )
>
> > Then you'll have each key-value pair as variables in the global
> > namespace.
> > The question is: should you do it?
>
> > Luis
>
> The answer is known: no, he should not do it :o)
>
> JM- Hide quoted text -
>
> - Show quoted text -

Thanks for your explanations.


From xahlee at gmail.com  Mon Mar 15 03:16:33 2010
From: xahlee at gmail.com (Xah Lee)
Date: Mon, 15 Mar 2010 00:16:33 -0700 (PDT)
Subject: Hacker News, Xahlee.Org, and What is Politics?
Message-ID: <5b32bf8e-6adc-42a6-8a98-228b13e8a3f1@w9g2000prb.googlegroups.com>

A essay related to the recent discussion of banning, and lisp
associated group at ycombinator.com .

---------------------------------------------
Hacker News, Xahlee.Org, and What is Politics?

Xah Lee, 2010-03-14

Today, i noticed that someone posted one of my article ?Why Emacs is
still so useful today? on my blogger site (xahlee.blogspot.com) to
Hacker News site here: Source.

Note that my site XahLee.org was unceremoniously banned around 2009-02
by the admin geekers there. (see bottom of: Ban Xah Lee). But,
apparantly, someone found my article useful. Now, in order to submit
my articles, you'll have to use my article mirror at
blogger.blogspot.com instead of xahlee.org.

--------------------
Tech Geeker's Ignorance Of Politics

The human nature of power struggle never ends. Many of these tech
geekers think they are apolitical, that they are peace loving, they
ride bikes not driving machines that pollute, they don't have interest
in business, they embrace the Free of ?freedom? Software or Open
Source of ?openness? software. The problem of human animals is that,
we all think that, yet, power struggle or the formation of politics
isn't something you consciously decide to do. Rather, it is something
that you unconsciously do whenever you have interaction with peers
when resources are not infinite. At the basic level, you have quarrels
with ya brothers about toys, in high school about seats, girls. Going
up a bit, you have all these teens, gamers, tech geekers, shouting,
kicking, banning, in all sort of internet forums, irc chat rooms,
mailing lists, in-world gaming channels. Going up, you have managers
fighting in corporations, politicians pissing at each other, leaders
warring among nation states. Note the word PEER here, because, you are
out of the game with those who are much more powerful than you, and
similarly, you can't be bothered by those far beneath you.

Of course, the tech geekers all think they are fair, just, maintaining
peace. But you can almost see the smug on their faces whenever any of
these ?admins?, ?group owners?, ?sysops?, ?operators?, exercise their
power. It is a basic human pleasure to force onto uncooperative
others. (See: What Desires Are Politically Important?)

Serious fairness and open policies never actually come up unless the
community becomes large, larger then the original special interest
clique. Before the group becomes large, typically their political
structure is academically called oligarchy. i.e. basically whoever
started the group, his cronies, rule.

We all understand conscious power struggle. However, it is when we
think that we are not doing politics when exercising our power, is
when it is likely most damaging, with respect to human progress. (the
subject of human progress, its ideal direction, goal, is itself is
quite not agreed upon among historical figures (big philosophers,
politicians, leaders, etc.).)

Part of the problem is ignorance. Most tech geekers, those coders,
engineers, type of folks, typically don't have much education or
interest in social sciences. Few years ago on irc channel, i was
ranting on the subject of politics, due to some difference of opinion
on tech stuff, and learned, rather not surprisingly, that one of the
guy don't understand that politics essentially means power struggle.
Most tech geekers think that Politics is what politicians do, that it
is something about rulers, about bad ass evil lords, ambitious guys,
Napolean, or about controversial subjects, back stabbing, cloak and
dagger, and isn't about, say, admins or policies in some online forum.

--------------------
What Is Politics?

Here's some Wikipedia quotes from Politics:

    Politics is a process by which groups of people make collective
decisions. The term is generally applied to behavior within civil
governments, but politics has been observed in other group
interactions, including corporate, academic, and religious
institutions. It consists of "social relations involving authority or
power"[1] and refers to the regulation of a political unit,[2] and to
the methods and tactics used to formulate and apply policy.[3]

    ...

    Political science, the study of politics, examines the acquisition
and application of power and "power corrupts".

It quotes this juicy quote:

    ?Politics: A strife of interests masquerading as a contest of
principles. The conduct of public affairs for private advantage.? ?
Ambrose Bierce[15]

I much prefer older edits of Wikipedia's opening paragraph. Here's few
excerpts

    Politics consists of "social relations involving authority or
power"[1] and refers to the regulation of a political unit,[2] and to
the methods and tactics used to formulate and apply policy.[3]

    ...

    In a broader sense, any situation involving power, or any
maneouvring in order to enhance one's power or status within a group,
may be described as politics (e.g. office politics).[3] This form of
politics "is most associated with a struggle for ascendancy among
groups having different priorities and power relations."[4]

And here's a point-blank shot:

    Politics is who gets what, when, and how. ? Harold Lasswell

-------------------

the url for this essay can be found on my website or blog.

  Xah
? http://xahlee.org/

?


From gandalf at shopzeus.com  Mon Mar 15 03:38:34 2010
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Mon, 15 Mar 2010 08:38:34 +0100
Subject: sqlite savepoint problem [solved]
In-Reply-To: <1268608579.2846.34.camel@durian>
References: <mailman.752.1268596146.23598.python-list@python.org>	
	<87bpeqzmmv.fsf@castleamber.com> <4B99E358.4020507@shopzeus.com>	
	<1268600658.2846.17.camel@durian> <4B99EE05.8060505@shopzeus.com>
	<1268608579.2846.34.camel@durian>
Message-ID: <4B9DE3FA.2090904@shopzeus.com>


> Annotating your example:
>
>    # entering this context actually does nothing
>    with conn:
>       # a transaction is magically created before this statement
>       conn.execute("insert into a values (1)")
>       # and is implicitly committed before this statement
>       conn.execute("SAVEPOINT sp1")
>       # a new transaction is magically created
>       conn.execute("insert into a values (2)")
>       # and committed, discarding the first savepoint.
>       conn.execute("SAVEPOINT sp2")
>       # a new transaction is magically created
>       conn.execute("insert into a values (3)")
>       # and committed, discarding the very savepoint we are trying to use.
>       conn.execute("ROLLBACK TO sp2")
>       conn.execute("insert into a values (4)")
>       conn.execute("RELEASE sp1")
>    

We all know the Zen of Python. Explicit is better than implicit.

There is no point in using a savepoint outside a transaction. There is 
no point in using a savepoint if it commits all previous changes 
automatically.

Conclusion:

Sqlite's isolation_level is dark magic. It mixes real isolation levels 
with behaviour of context managers, and automagical commits in the wrong 
places.
Setting isolation_level=None is a must for anyone who want to do any 
serious work with sqlite.

    L





From Brian.Mingus at Colorado.EDU  Mon Mar 15 03:39:29 2010
From: Brian.Mingus at Colorado.EDU (Brian J Mingus)
Date: Mon, 15 Mar 2010 01:39:29 -0600
Subject: Hacker News, Xahlee.Org, and What is Politics?
In-Reply-To: <5b32bf8e-6adc-42a6-8a98-228b13e8a3f1@w9g2000prb.googlegroups.com>
References: <5b32bf8e-6adc-42a6-8a98-228b13e8a3f1@w9g2000prb.googlegroups.com>
Message-ID: <9839a05c1003150039j40cbe2bao16cf51ca431a1a0f@mail.gmail.com>

On Mon, Mar 15, 2010 at 1:16 AM, Xah Lee <xahlee at gmail.com> wrote:

> A essay related to the recent discussion of banning, and lisp
> associated group at ycombinator.com .


Is there some Python related issue I might help you out with? Or perhaps you
wish to provide Python assistance to someone on this list. Or perhaps you
would like to write some Python code, or read the friendly Python manual, or
draft a new PEP. Any one of these things would be a much better usage of
your time than drafting middle to high school quality essays.
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From davty216 at student.liu.se  Mon Mar 15 03:49:34 2010
From: davty216 at student.liu.se (David Tynnhammar)
Date: Mon, 15 Mar 2010 08:49:34 +0100
Subject: "Distributed" database in Python
Message-ID: <6da346621003150049h7c8901a2kf7dfb09db3ddf861@mail.gmail.com>

Greetings. I'm looking for a "distributed" database. (I'm not sure if
distributed is the correct terminology though).

My problem is this; I have a client application which once in a while
needs to sync with a central database. (And of course the client
-databases might be updated locally etc).

Are there any other resources you can recommend me? (I have basic RDMS
knowledge (MySQL)).


From kevin.p.dwyer at gmail.com  Mon Mar 15 03:50:09 2010
From: kevin.p.dwyer at gmail.com (Kev Dwyer)
Date: Mon, 15 Mar 2010 07:50:09 +0000 (UTC)
Subject: Is it possible to use re2 from Python?
References: <f853ea28-b236-4a17-8ded-43e5fe455d47@a18g2000yqc.googlegroups.com>
	<mailman.737.1268590742.23598.python-list@python.org>
	<0540f7d0-95f6-4b38-900d-dc25958ff232@g26g2000yqn.googlegroups.com>
Message-ID: <hnkorh$mv9$2@dough.gmane.org>

On Sun, 14 Mar 2010 14:40:34 -0700, _wolf wrote:

>> There's a recent thread about this on the python-dev list,
> 
> pointers? i searched but didn?t find anything.

http://mail.python.org/pipermail/python-dev/2010-March/098354.html



From ryan at rfk.id.au  Mon Mar 15 03:53:49 2010
From: ryan at rfk.id.au (Ryan Kelly)
Date: Mon, 15 Mar 2010 18:53:49 +1100
Subject: sqlite savepoint problem [solved]
In-Reply-To: <4B99FCCF.5080506@shopzeus.com>
References: <mailman.752.1268596146.23598.python-list@python.org>
	<87bpeqzmmv.fsf@castleamber.com> <4B99E358.4020507@shopzeus.com>
	<1268600658.2846.17.camel@durian> <4B99EE05.8060505@shopzeus.com>
	<4B99F1D1.2070202@shopzeus.com> <1268604831.2846.23.camel@durian>
	<4B99FCCF.5080506@shopzeus.com>
Message-ID: <1268639629.2846.48.camel@durian>

On Fri, 2010-03-12 at 09:35 +0100, Laszlo Nagy wrote:
> > No it doesn't.  The problem is that using a connection as a context
> > manager doesn't do what you think. 
> >
> > It does *not* start a new transaction on __enter__ and commit it on
> > __exit__.  As far as I can tell it does nothing on __enter__ and calls
> > con.commit() or con.rollback() on exit.  With isolation_level=None,
> > these are no-ops.
> >   
> Thank you Ryan! You are abolutely right, and thank you for reading the 
> source.  Now everything works as I imagined.

No problemo - isolation_level has given me my fair share of headaches in
the past, so I couldn't resist the opportunity to understand it a little
better.

> The way the context manager and isolation_level works looks very very 
> strange to me. Here is a demonstration:
> 
> import sqlite3
> def getconn():
>     conn = sqlite3.connect(':memory:')
>     conn.isolation_level = None
>     return conn
> def main():
>     with getconn() as conn:
>         conn.execute("create table a ( i integer ) ")
>     try:
>         conn.execute("insert into a values (1)")
>         with conn:
>             conn.execute("insert into a values (2)")
>             raise Exception
>     except:
>         print "There was an error"
>     for row in conn.execute("select * from a"):
>         print row
> main()
> 
> 
> Output:
> 
> There was an error
> (1,)
> (2,)
>
> 
> Looks like the context manager did not roll back anything.

Yes, because there were no transactions created so there was nothing to
roll back.

>  If I remove 
> isolation_level=None then I get this:
> 
> There was an error
> 
> E.g. the context manager rolled back something that was executed outside 
> the context. 

Yes, because the transactions created by the default isolation level do
not nest, so the rollback happens at outermost scope.

> I cannot argue with the implementation - it is that way. 
> But this is not what I would expect. I believe I'm not alone with this.

That's at least two of us :-)

> Just for clarity, we should put a comment at the end of the 
> documentation here:
> 
> http://docs.python.org/library/sqlite3.html#sqlite3-controlling-transactions
> 
> I would add at least these things:
> 
> #1. By using isolation_level = None, connection objects (used as a 
> context manager) WON'T automatically commit or rollback transactions.
> #2. Using any isolation level, connection objects WON'T automatically 
> begin a transaction.
> #3. Possibly, include your connection manager class code, to show how to 
> do it "the expected" way.
> 
> Also one should clarify in the documentation, what isolation_level does. 
> Looks like setting isolation_level to None is not really an "auto commit 
> mode". It is not even part of sqlite itself. It is part of the python 
> extension.

I think of it as almost the opposite - you have to set
isolation_level=None to get the unadulterated behaviour of the
underlying sqlite library. 

I'm sure the devs would appreciate a documentation patch (submission
details at http://python.org/dev/patches/).  I'm also pretty confident
that I won't have time to do one up anytime soon :-)


 Good luck with your project!


     Ryan

-- 
Ryan Kelly
http://www.rfk.id.au  |  This message is digitally signed. Please visit
ryan at rfk.id.au        |  http://www.rfk.id.au/ramblings/gpg/ for details

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From steven at REMOVE.THIS.cybersource.com.au  Mon Mar 15 04:01:02 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 15 Mar 2010 08:01:02 GMT
Subject: "Distributed" database in Python
References: <mailman.776.1268639376.23598.python-list@python.org>
Message-ID: <pan.2010.03.15.08.01.01@REMOVE.THIS.cybersource.com.au>

On Mon, 15 Mar 2010 08:49:34 +0100, David Tynnhammar wrote:

> Greetings. I'm looking for a "distributed" database. (I'm not sure if
> distributed is the correct terminology though).
> 
> My problem is this; I have a client application which once in a while
> needs to sync with a central database. (And of course the client
> -databases might be updated locally etc).
> 
> Are there any other resources you can recommend me? (I have basic RDMS
> knowledge (MySQL)).

Google and Wikipedia are your friends.

http://en.wikipedia.org/wiki/Distributed_database
http://www.google.com/search?q=distributed+database
http://www.google.com/search?q=python+distributed+database


If you have already tried this, then you should say so, so that we don't 
waste our time, and yours, going over ground you have already covered.



-- 
Steven


From mail at timgolden.me.uk  Mon Mar 15 04:41:10 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Mon, 15 Mar 2010 08:41:10 +0000
Subject: dll in project?
In-Reply-To: <bc7f680c1003142043y78505aa3jb5e70360a692ebc8@mail.gmail.com>
References: <bc7f680c1003142043y78505aa3jb5e70360a692ebc8@mail.gmail.com>
Message-ID: <4B9DF2A6.70608@timgolden.me.uk>

On 15/03/2010 03:43, Alex Hall wrote:
> I have a dll I am trying to use, but I get a Windows error 126, "the
> specified module could not be found". Here is the code segment:
> nvdaController=ctypes.windll.LoadLibrary("nvdaControllerClient32.dll") 	
>
> I have the specified dll file in the same directory as the file trying
> to use said dll

The DLL search path:

http://msdn.microsoft.com/en-us/library/7d83bc18%28VS.80%29.aspx

includes the directory which holds the executable for the current prcoess;
it include the current directory; and it includes other things which I
doubt apply here.

But it doesn't include (if I may be permitted a little well-intentioned
ridicule) the directory where the current Python module is stored.
In other words: what does os.getcwd () return?

TJG


From mick.lausch at gmail.com  Mon Mar 15 04:43:02 2010
From: mick.lausch at gmail.com (Michael.Lausch)
Date: Mon, 15 Mar 2010 01:43:02 -0700 (PDT)
Subject: staticmethod and setattr
Message-ID: <a38bb46a-7a0d-4cc6-8cea-650e939eaa33@t20g2000yqe.googlegroups.com>

Hi,

I managed to get confused by Python, which is not such an easy task.

The problem i have is rooted in marshalling, JSON and Dojo.
I need some static class in function with the name "$ref"
i tried:
class Foo(object):
    @staticmethod
    def _ref(o):
         pass

setattr(Foo, "$ref", Foo._ref)

but when i do something like this in code:

class B(object):
    pass
b = Bar
f = Foo.getattr("$ref")
f(b)

if get the following error
ypeError
unbound method _ref() must be called with Foo instance as first
argument (got Bar instance instead)

I managed to impelemnt it with a unbound, "normal" _ref() function,
but i want one _ref function per
class, because they are a little bit different for each class.

One aproach which i have not tried is:
setattr(Foo, "$ref", Foo._ref.im_func).
maybe this works, but i think this is not a clean aproach.
Any ideas?






From breamoreboy at yahoo.co.uk  Mon Mar 15 04:46:31 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Mon, 15 Mar 2010 08:46:31 +0000
Subject: iterator/generator
In-Reply-To: <db51dbb8-920a-405a-8ddc-2a734f7140ac@q21g2000yqm.googlegroups.com>
References: <db51dbb8-920a-405a-8ddc-2a734f7140ac@q21g2000yqm.googlegroups.com>
Message-ID: <hnks56$k3i$1@dough.gmane.org>

vsoler wrote:
> I am working on a script that reads data from an excel workbook. The
> data is located in a named range whose first row contains the headers.
> It works!!!  I find it superb that python is able to do such things!!!
> 
> Now my questions.
> 
> a. My ranges can in practice be quite big, and although I am happy
> with the speed I get, because I am learning python, I think I could do
> it still a bit better. I think that the line   for i in matriz[1:]:
> could be improved with an iterator/generator, but I am not quite
> certain how I should proceed.

I write this :-
for j, i in enumerate(matriz):
     if j:
         etc...

If there's a better method for some definition of better I'm certain 
we'll quickly get told.

Please see the python docs for the enumerate built-in.

HTH.

Mark Lawrence.

[snip the rest]



From rantingrick at gmail.com  Mon Mar 15 04:55:33 2010
From: rantingrick at gmail.com (rantingrick)
Date: Mon, 15 Mar 2010 01:55:33 -0700 (PDT)
Subject: Hacker News, Xahlee.Org, and What is Politics?
References: <5b32bf8e-6adc-42a6-8a98-228b13e8a3f1@w9g2000prb.googlegroups.com>
Message-ID: <e0b21712-15af-49cd-b01c-d6135d0cdf4a@q21g2000yqm.googlegroups.com>


Bravo!, Bravo!

A wonderful post xah, thanks for sharing and i hope it sinks in with
the people around here who need a lesson in humility. I was just a few
days ago feeling quite passionate about this subject and creating my
own draft but than i lost interest because i knew nobody would even
care and probably just accuse me of trolling. Anyhow thanks for this!


From robin at reportlab.com  Mon Mar 15 05:58:59 2010
From: robin at reportlab.com (Robin Becker)
Date: Mon, 15 Mar 2010 09:58:59 +0000
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
In-Reply-To: <4B9A9624.7040200@v.loewis.de>
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>	<mailman.619.1268324988.23598.python-list@python.org>	<4B992FB5.8090207@v.loewis.de>	<4B9A2810.9030602@chamonix.reportlab.co.uk>	<4B9A614C.1080105@chamonix.reportlab.co.uk>
	<4B9A9624.7040200@v.loewis.de>
Message-ID: <4B9E04E3.90408@chamonix.reportlab.co.uk>

On 12/03/2010 19:29, "Martin v. L?wis" wrote:
>> Not sure if this is a bug
>
> I think it is. It seems that the cross-build support in msvc9compiler
> has been tested only in a build tree of Python (where there is no Libs
> directory).

This minor patch seems to fix the problem for me (using a PCBuild folder 
parallel to libs)

C:\Python\Lib\distutils\command>diff build_ext.py.orig build_ext.py
207c207,209
<                 self.library_dirs.append(new_lib)
---
 >                     self.library_dirs.insert(0,new_lib)
 >                 else:
 >                     self.library_dirs.append(new_lib)

>
> For released copies of Python, I could change that to distribute the
> AMD64 pythonXY.lib in libs/amd64. [FWIW, I'm still puzzled why I ship
> the import libraries of all the pyd files as well - I can't see a reason
> other than tradition]. Then, distutils should change to look it up there.
.......

Just checked and all the pyd's seem only to export the xxx_init functions 
(sometimes there are two in the pyd) so the .libs do seem a bit redundant.

-- 
Robin Becker



From eckhardt at satorlaser.com  Mon Mar 15 06:14:31 2010
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Mon, 15 Mar 2010 11:14:31 +0100
Subject: dll in project?
References: <mailman.770.1268624619.23598.python-list@python.org>
Message-ID: <7td177-uar.ln1@satorlaser.homedns.org>

Alex Hall wrote:
> I have a dll I am trying to use, but I get a Windows error 126, "the
> specified module could not be found". Here is the code segment:
> nvdaController=ctypes.windll.LoadLibrary("nvdaControllerClient32.dll")

In addition to Alf's answer, this can also happen when the OS can't find
another DLL that this one depends on.

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From greg.ewing at canterbury.ac.nz  Mon Mar 15 06:29:51 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Mon, 15 Mar 2010 23:29:51 +1300
Subject: Reverse engineering CRC?
In-Reply-To: <kz88du.hk0@spenarnc.xs4all.nl>
References: <7vj7fdFnnjU1@mid.individual.net> <kz88du.hk0@spenarnc.xs4all.nl>
Message-ID: <4B9E0C1F.9020003@canterbury.ac.nz>

I've solved the problem now.

It turned out to be a very standard CRC algorithm, complicated
by the presence of a few extra bytes of data being checked that
didn't appear explicitly in the file anywhere.

In the process I developed some very general techniques for
solving this kind of problem, which I've written about here
if anyone's interested:

http://www.cosc.canterbury.ac.nz/greg.ewing/essays/CRC-Reverse-Engineering.html

Thanks for everyone's help,
Greg


From steve at REMOVE-THIS-cybersource.com.au  Mon Mar 15 06:40:31 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 15 Mar 2010 10:40:31 GMT
Subject: staticmethod and setattr
References: <a38bb46a-7a0d-4cc6-8cea-650e939eaa33@t20g2000yqe.googlegroups.com>
Message-ID: <4b9e0e9f$0$27822$c3e8da3@news.astraweb.com>

On Mon, 15 Mar 2010 01:43:02 -0700, Michael.Lausch wrote:

> Hi,
> 
> I managed to get confused by Python, which is not such an easy task.
> 
> The problem i have is rooted in marshalling, JSON and Dojo. I need some
> static class in function with the name "$ref" i tried:
> class Foo(object):
>     @staticmethod
>     def _ref(o):
>          pass
> 
> setattr(Foo, "$ref", Foo._ref)

That doesn't work as expected:

>>> Foo.__dict__['_ref'] is Foo.__dict__['$ref']
False


Try this instead:

>>> setattr(Foo, "$ref", Foo.__dict__['_ref'])
>>> Foo.__dict__['_ref'] is Foo.__dict__['$ref']
True




-- 
Steven


From efiish at gmail.com  Mon Mar 15 06:57:38 2010
From: efiish at gmail.com (Lan Qing)
Date: Mon, 15 Mar 2010 18:57:38 +0800
Subject: File existence check with partial filename
In-Reply-To: <hnkcqh$avd$1@news.eternal-september.org>
References: <C7C2FE43.5AB0%Sang-Ho.Yun@jpl.nasa.gov>
	<hnkcqh$avd$1@news.eternal-september.org>
Message-ID: <ee9ad2071003150357y448f2ccej80462f35910d08e2@mail.gmail.com>

Or use the regular module:

import re
import os

for filename in os.listdir('.'):
    if re.match("*HV*", filename):
          # do something with the file

On Mon, Mar 15, 2010 at 12:24 PM, Alf P. Steinbach <alfps at start.no> wrote:

> * Sang-Ho Yun:
>
>  I learned that I can check the existence of a file using
>> os.path.isfile("filename").
>>
>> What if I need to check if there is a file that contains "HV" in the
>> filename?  What should I do?
>>
>
> <code>
>    from __future__ import print_function
>    import os

   for filename in os.listdir( "." ):
>        if "HV" in filename.upper():
>            print( filename )
> </code>
>
>
> Cheers & hth.,
>
> - Alf
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
-------------- next part --------------
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From mehgcap at gmail.com  Mon Mar 15 07:28:11 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Mon, 15 Mar 2010 07:28:11 -0400
Subject: dll in project?
In-Reply-To: <7td177-uar.ln1@satorlaser.homedns.org>
References: <mailman.770.1268624619.23598.python-list@python.org>
	<7td177-uar.ln1@satorlaser.homedns.org>
Message-ID: <bc7f680c1003150428w3cfea439vb1990885a3c8eff3@mail.gmail.com>

On 3/15/10, Ulrich Eckhardt <eckhardt at satorlaser.com> wrote:
> Alex Hall wrote:
>> I have a dll I am trying to use, but I get a Windows error 126, "the
>> specified module could not be found". Here is the code segment:
>> nvdaController=ctypes.windll.LoadLibrary("nvdaControllerClient32.dll")
>
> In addition to Alf's answer, this can also happen when the OS can't find
> another DLL that this one depends on.

Well, os.getcwd() returns "c:\python26", not my program's directory.
However, I changed the reference to the dll to be
helpers.progdir+'\\nvdaControllerClient32.dll'
and still no luck! helpers.progdir is a var holding the top-level
directory of my project, using os.path. Again, using this more precise
reference still fails, triggering my except statement in my try/catch
loop.


From alfps at start.no  Mon Mar 15 07:37:55 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Mon, 15 Mar 2010 12:37:55 +0100
Subject: dll in project?
In-Reply-To: <mailman.785.1268652497.23598.python-list@python.org>
References: <mailman.770.1268624619.23598.python-list@python.org>	<7td177-uar.ln1@satorlaser.homedns.org>
	<mailman.785.1268652497.23598.python-list@python.org>
Message-ID: <hnl66n$5vr$1@news.eternal-september.org>

* Alex Hall:
> On 3/15/10, Ulrich Eckhardt <eckhardt at satorlaser.com> wrote:
>> Alex Hall wrote:
>>> I have a dll I am trying to use, but I get a Windows error 126, "the
>>> specified module could not be found". Here is the code segment:
>>> nvdaController=ctypes.windll.LoadLibrary("nvdaControllerClient32.dll")
>> In addition to Alf's answer, this can also happen when the OS can't find
>> another DLL that this one depends on.
> 
> Well, os.getcwd() returns "c:\python26", not my program's directory.
> However, I changed the reference to the dll to be
> helpers.progdir+'\\nvdaControllerClient32.dll'
> and still no luck!

Are you sure you get a single directory separator backslash there?

I suggest using the os.path 'join' function, whatever it was called.


> helpers.progdir is a var holding the top-level
> directory of my project, using os.path.

But is that where the DLL resides, or is it in some subdirectory?


> Again, using this more precise
> reference still fails, triggering my except statement in my try/catch
> loop.

Try also checking the arguments & documentation of ctypes.windll.LoadLibrary. I 
know, you probably already done that. But I mention it just in case (I'm not 
familiar with that function at the Python level, so don't know about the args).


Cheers & hth.,

- Alf


From eckhardt at satorlaser.com  Mon Mar 15 07:44:18 2010
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Mon, 15 Mar 2010 12:44:18 +0100
Subject: dll in project?
References: <mailman.770.1268624619.23598.python-list@python.org>
	<7td177-uar.ln1@satorlaser.homedns.org>
	<mailman.785.1268652497.23598.python-list@python.org>
Message-ID: <i5j177-2kr.ln1@satorlaser.homedns.org>

Alex Hall wrote:
> On 3/15/10, Ulrich Eckhardt <eckhardt at satorlaser.com> wrote:
>> Alex Hall wrote:
>>> I have a dll I am trying to use, but I get a Windows error 126, "the
>>> specified module could not be found". Here is the code segment:
>>> nvdaController=ctypes.windll.LoadLibrary("nvdaControllerClient32.dll")
>>
>> In addition to Alf's answer, this can also happen when the OS can't find
>> another DLL that this one depends on.

Did you check if this could be the case?

> Well, os.getcwd() returns "c:\python26", not my program's directory.
> However, I changed the reference to the dll to be
> helpers.progdir+'\\nvdaControllerClient32.dll'
> and still no luck!

Generally, there is os.path.join() IIRC which does this portably. This
probably doesn't matter though. What I would check is firstly if this file
could be opened at all, e.g. using os.stat().

> helpers.progdir is a var holding the top-level directory of my
> project, using os.path.

Huh? In what way using os.path?

> Again, using this more precise reference still fails, triggering my
> except statement in my try/catch loop.

Same error? See my initial guess! As a tool for finding out if there are
missing dependencies, take a look at http://dependencywalker.com

BTW: No need to CC me, I read your initial request here, I can ready any
follow-ups here, too. ;)

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From iwanttobeabadger at googlemail.com  Mon Mar 15 08:21:42 2010
From: iwanttobeabadger at googlemail.com (Nathan Harmston)
Date: Mon, 15 Mar 2010 12:21:42 +0000
Subject: Large regular expressions
Message-ID: <b32951aa1003150521s22d1642cvbb78062f1fe3ed59@mail.gmail.com>

Hi,

So I m trying to use a very large regular expression, basically I have
a list of items I want to find in text, its kind of a conjunction of
two regular expressions and a big list......not pretty. However
everytime I try to run my code I get this exception:

OverflowError: regular expression code size limit exceeded

I understand that there is a Python imposed limit on the size of the
regular expression. And although its not nice I have a machine with
12Gb of RAM just waiting to be used, is there anyway I can alter
Python to allow big regular expressions?

Could anyone suggest other methods of these kind of string matching in
Python? I m trying to see if my swigged alphabet trie is faster than
whats possible in Python!

Many thanks,


Nathan


From mick.lausch at gmail.com  Mon Mar 15 08:42:01 2010
From: mick.lausch at gmail.com (Michael.Lausch)
Date: Mon, 15 Mar 2010 05:42:01 -0700 (PDT)
Subject: staticmethod and setattr
References: <a38bb46a-7a0d-4cc6-8cea-650e939eaa33@t20g2000yqe.googlegroups.com>
	<4b9e0e9f$0$27822$c3e8da3@news.astraweb.com>
Message-ID: <43208240-720b-40ff-9f41-b8a5a0c69246@g10g2000yqh.googlegroups.com>

On Mar 15, 11:40?am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Mon, 15 Mar 2010 01:43:02 -0700, Michael.Lausch wrote:
> > Hi,
>
> > I managed to get confused by Python, which is not such an easy task.
>
> > The problem i have is rooted in marshalling, JSON and Dojo. I need some
> > static class in function with the name "$ref" i tried:
> > class Foo(object):
> > ? ? @staticmethod
> > ? ? def _ref(o):
> > ? ? ? ? ?pass
>
> > setattr(Foo, "$ref", Foo._ref)
>
> That doesn't work as expected:
>
> >>> Foo.__dict__['_ref'] is Foo.__dict__['$ref']
>
> False
>
> Try this instead:
>
> >>> setattr(Foo, "$ref", Foo.__dict__['_ref'])
> >>> Foo.__dict__['_ref'] is Foo.__dict__['$ref']
>
> True

Now I'm trying to understand why this is the case.
How is Foo.__dict__['_ref']  different from Foo._ref?
Shouldn't it return the same attribute?

And after further experiments i found out that a making
Foo._ref a classmethod does work with my first approach.



From stefan_ml at behnel.de  Mon Mar 15 08:45:31 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Mon, 15 Mar 2010 13:45:31 +0100
Subject: Large regular expressions
In-Reply-To: <b32951aa1003150521s22d1642cvbb78062f1fe3ed59@mail.gmail.com>
References: <b32951aa1003150521s22d1642cvbb78062f1fe3ed59@mail.gmail.com>
Message-ID: <hnla5b$5gs$1@dough.gmane.org>

Nathan Harmston, 15.03.2010 13:21:
> So I m trying to use a very large regular expression, basically I have
> a list of items I want to find in text, its kind of a conjunction of
> two regular expressions and a big list......not pretty. However
> everytime I try to run my code I get this exception:
>
> OverflowError: regular expression code size limit exceeded
>
> I understand that there is a Python imposed limit on the size of the
> regular expression. And although its not nice I have a machine with
> 12Gb of RAM just waiting to be used, is there anyway I can alter
> Python to allow big regular expressions?
>
> Could anyone suggest other methods of these kind of string matching in
> Python?

If what you are trying to match is in fact a set of strings instead of a 
set of regular expressions, you might find this useful:

http://pypi.python.org/pypi/acora

Stefan



From alain at dpt-info.u-strasbg.fr  Mon Mar 15 08:50:27 2010
From: alain at dpt-info.u-strasbg.fr (Alain Ketterlin)
Date: Mon, 15 Mar 2010 13:50:27 +0100
Subject: Large regular expressions
References: <mailman.786.1268655707.23598.python-list@python.org>
Message-ID: <877hpdycj0.fsf@dpt-info.u-strasbg.fr>

Nathan Harmston <iwanttobeabadger at googlemail.com> writes:

[...]
> Could anyone suggest other methods of these kind of string matching in
> Python? I m trying to see if my swigged alphabet trie is faster than
> whats possible in Python!

Since you mention using a trie, I guess it's just a big alternative of
fixed strings. You may want to try using the Aho-Corasick variant. It
looks like there are several implementations (google finds at least
two). I would be surprised if any pure python solution were faster than
tries implemented in C. Don't forget to tell us your findings.

-- Alain.


From mehgcap at gmail.com  Mon Mar 15 09:24:01 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Mon, 15 Mar 2010 09:24:01 -0400
Subject: dll in project?
In-Reply-To: <i5j177-2kr.ln1@satorlaser.homedns.org>
References: <mailman.770.1268624619.23598.python-list@python.org>
	<7td177-uar.ln1@satorlaser.homedns.org>
	<mailman.785.1268652497.23598.python-list@python.org>
	<i5j177-2kr.ln1@satorlaser.homedns.org>
Message-ID: <bc7f680c1003150624s7cf6710dm41a4a91d21e88d4c@mail.gmail.com>

Okay, I got a new copy and all seems well now. The dll is found and
loaded. The functions inside the dll are not working, but that is not
Python's fault. Thanks to everyone for your help and suggestions!

On 3/15/10, Ulrich Eckhardt <eckhardt at satorlaser.com> wrote:
> Alex Hall wrote:
>> On 3/15/10, Ulrich Eckhardt <eckhardt at satorlaser.com> wrote:
>>> Alex Hall wrote:
>>>> I have a dll I am trying to use, but I get a Windows error 126, "the
>>>> specified module could not be found". Here is the code segment:
>>>> nvdaController=ctypes.windll.LoadLibrary("nvdaControllerClient32.dll")
>>>
>>> In addition to Alf's answer, this can also happen when the OS can't find
>>> another DLL that this one depends on.
>
> Did you check if this could be the case?
>
>> Well, os.getcwd() returns "c:\python26", not my program's directory.
>> However, I changed the reference to the dll to be
>> helpers.progdir+'\\nvdaControllerClient32.dll'
>> and still no luck!
>
> Generally, there is os.path.join() IIRC which does this portably. This
> probably doesn't matter though. What I would check is firstly if this file
> could be opened at all, e.g. using os.stat().
>
>> helpers.progdir is a var holding the top-level directory of my
>> project, using os.path.
>
> Huh? In what way using os.path?
>
>> Again, using this more precise reference still fails, triggering my
>> except statement in my try/catch loop.
>
> Same error? See my initial guess! As a tool for finding out if there are
> missing dependencies, take a look at http://dependencywalker.com
>
> BTW: No need to CC me, I read your initial request here, I can ready any
> follow-ups here, too. ;)
>
> Uli
>
> --
> Sator Laser GmbH
> Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From catonano at gmail.com  Mon Mar 15 09:41:14 2010
From: catonano at gmail.com (catonano)
Date: Mon, 15 Mar 2010 06:41:14 -0700 (PDT)
Subject: Dreaming of new generation IDE
References: <mailman.1825.1265195427.28905.python-list@python.org> 
	<c4a84929-a6af-4281-8e29-7fd3eaa90eb0@m16g2000yqc.googlegroups.com> 
	<5b51740d-11f1-4f01-b51c-d1b6ea161eb7@l19g2000yqb.googlegroups.com>
Message-ID: <f4ee1b0b-c69a-4938-b4eb-2389acead449@g28g2000yqh.googlegroups.com>

Hello again, people

On Feb 11, 6:30?pm, Francis Carr <coldtort... at gmail.com> wrote:
> > I can't believe the code editing situation today is in a such sorry
> > state.
>
> I can't believe an old coder is feeling so sorry for himself.

Ok, I'm feeling sorry; still, I think I made a point.


> > Today, I tried to understand the twisted.web.client code and I found 3
> Maybe the relevant lesson to be taken from Smalltalk is *not*
> ? "put it all in one image"
> but instead
> ? "write code to solve problems, e.g., reading code"


> I suggest defining a few shell functions to *automate* the search, for
> example in zsh
>
> function allf () {

> Smalltalk's images are cool. ?But they are such a huge hammer, and
> they impose so many additional requirements! ?The costs outweigh the
> cool.

Francis, I disagree on the final balance statement about the Smalltalk
images and I thank you for your suggestions on how to use grep and
shell scripting.

I also have no problem to admit I was feeling sorry for myself.

But today I found something I think is relevant to this thread.

It's here:
http://www.cs.brown.edu/people/acb/codebubbles_site.htm

it's about a IDE for Java called Bubbles.

It sports a zooming interface and the MAIN idea it proposes, in my
opinion, is that the code is NOT thought as files content, rather as
fragments, called bubbles.

And then you arrange your bubbles in a 2d space a little bit like in a
videogame.

I think it's very similar to the Smalltalk image thing (as a concept,
if not as an implementation), with its live things and direct
manipulation.

If you open the footage directly in youtube, you can go to some
"related" footages about a similar thing made by Microsoft that of
course ditches the main idea retaining the concept of files and
directories, overlapping the concept of files and classes (sigh).

I didn't imagine such a research existed and the discovery confirms to
me that the bother I indicated in this thread is somewhat shared by
someone, around the world.

As for my feelings, I swear I'm taking care of them in a way that
doesn't involve bothering anyone on any newsgroup ;-)

Steve, does Bubble gets any closer to your vision than the "ugly"
Smalltalk thing ?

Bye
Catonano


From alex at moreati.org.uk  Mon Mar 15 09:50:32 2010
From: alex at moreati.org.uk (Alex Willmer)
Date: Mon, 15 Mar 2010 06:50:32 -0700 (PDT)
Subject: Understanding the CPython dict implementation
References: <mailman.768.1268610003.23598.python-list@python.org> 
	<4b9dadc4$0$1639$742ec2ed@news.sonic.net>
Message-ID: <f0343a45-46a8-4352-bd06-a2ef6f2ab81c@r27g2000yqn.googlegroups.com>

On Mar 15, 4:06?am, John Nagle <na... at animats.com> wrote:
> ? ? Is this available as a paper?
>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? John Nagle

It doesn't wppear to be, slides are here:

http://us.pycon.org/2010/conference/schedule/event/12/

Alex


From bruno.42.desthuilliers at websiteburo.invalid  Mon Mar 15 09:51:30 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Mon, 15 Mar 2010 14:51:30 +0100
Subject: staticmethod and setattr
In-Reply-To: <43208240-720b-40ff-9f41-b8a5a0c69246@g10g2000yqh.googlegroups.com>
References: <a38bb46a-7a0d-4cc6-8cea-650e939eaa33@t20g2000yqe.googlegroups.com>
	<4b9e0e9f$0$27822$c3e8da3@news.astraweb.com>
	<43208240-720b-40ff-9f41-b8a5a0c69246@g10g2000yqh.googlegroups.com>
Message-ID: <4b9e3b61$0$12084$426a34cc@news.free.fr>

Michael.Lausch a ?crit :
(snip)


> Now I'm trying to understand why this is the case.
> How is Foo.__dict__['_ref']  different from Foo._ref?
> Shouldn't it return the same attribute?
> 

It's an application of the descriptor protocol:

http://wiki.python.org/moin/FromFunctionToMethod


From andreas.loescher at s2005.tu-chemnitz.de  Mon Mar 15 10:24:55 2010
From: andreas.loescher at s2005.tu-chemnitz.de (Andreas =?ISO-8859-1?Q?L=F6scher?=)
Date: Mon, 15 Mar 2010 15:24:55 +0100
Subject: staticmethod and setattr
In-Reply-To: <43208240-720b-40ff-9f41-b8a5a0c69246@g10g2000yqh.googlegroups.com>
Message-ID: <1268663020.10067.35.camel@laptop>

Am Montag, den 15.03.2010, 05:42 -0700 schrieb Michael.Lausch:
> On Mar 15, 11:40 am, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
> > On Mon, 15 Mar 2010 01:43:02 -0700, Michael.Lausch wrote:
> > > Hi,
> >
> > > I managed to get confused by Python, which is not such an easy task.
> >
> > > The problem i have is rooted in marshalling, JSON and Dojo. I need some
> > > static class in function with the name "$ref" i tried:
> > > class Foo(object):
> > >     @staticmethod
> > >     def _ref(o):
> > >          pass
> >
> > > setattr(Foo, "$ref", Foo._ref)
> >
> > That doesn't work as expected:
> >
> > >>> Foo.__dict__['_ref'] is Foo.__dict__['$ref']
> >
> > False
> >
> > Try this instead:
> >
> > >>> setattr(Foo, "$ref", Foo.__dict__['_ref'])
> > >>> Foo.__dict__['_ref'] is Foo.__dict__['$ref']
> >
> > True
> 
> Now I'm trying to understand why this is the case.
> How is Foo.__dict__['_ref']  different from Foo._ref?
> Shouldn't it return the same attribute?
> 
> And after further experiments i found out that a making
> Foo._ref a classmethod does work with my first approach.
> 

In the class dictionary are the "raw" objects stored. For example:

class Spam:
    @staticmethod
    def egg1():
        pass
    def egg2(self):
        pass

>>> Spam.__dict__
{'egg1': <staticmethod object at 0x7f0b03240b40>, '__module__':
'__main__', 'egg2': <function egg2 at 0x7f0b0432a2a8>, '__doc__': None}

If you try to call egg1 as staticmethod you will get an error:
>>> Spam.__dict__['egg1']()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'staticmethod' object is not callable

getattr() is not only a shortcut for the line above. It searches all
base classes for the specified name in the class dictionaries. If the
name is found, and the object has an additional descriptor, it is
applied on the object itself.

In case of an static method, the descriptor sm_descr_get is located in
Objects/funcobjects.c of the sources and it retriefes the encapsuled
callable, which in this case is the function egg1.

If you now set the function as new attribute, it is no longer a static
method, but a normal function. If a function is retrieved via getattr(),
it is encapsuled in an method object. (func_descr_get in the same file)
If you now try to call the method in you example, you call a method from
a class. This results in an unbound method, which requests an instance
of the class as first agument. 

I hope this clears some things up.

Best
Andreas



From gdamjan at gmail.com  Mon Mar 15 10:53:21 2010
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Mon, 15 Mar 2010 15:53:21 +0100
Subject: Python for newbies (Pythno users group in Macedonia)
References: <hpgq67-gai.ln1@archaeopteryx.softver.org.mk>
	<mailman.702.1268486707.23598.python-list@python.org>
Message-ID: <28u177-m9j.ln1@archaeopteryx.softver.org.mk>

> If you are all English-speakers then perhaps you could consider
> showing a PyCon video - see
> 
>   http://pycon.blip.tv

That's certainly something I'm considering for the more advanced users

> Good luck with the group. I hope to see PyCon Macedonia emerging
> before too long!

Thanks :)
I guess we'd have to wait a decade or so for a PyCon here 

-- 
damjan


From gdamjan at gmail.com  Mon Mar 15 11:05:31 2010
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Mon, 15 Mar 2010 16:05:31 +0100
Subject: Python for newbies (Pythno users group in Macedonia)
References: <hpgq67-gai.ln1@archaeopteryx.softver.org.mk>
	<mailman.719.1268515208.23598.python-list@python.org>
Message-ID: <ruu177-gcj.ln1@archaeopteryx.softver.org.mk>

>> we are starting with bi-monthly Python User Group meetings in Skopje,
>> Macedonia. The meetings are targeted for both beginners and more
>> experienced users.
>>   
> ...
> http://us.pycon.org/2010/conference/schedule/event/108/

Great resource, exactly what I needed.

So, they use this book http://www.greenteapress.com/thinkpython/ as a 
guide, seems like a good choice.

I also learned about the tutor mail list:
http://mail.python.org/mailman/listinfo/tutor


-- 
damjan


From alex at moreati.org.uk  Mon Mar 15 11:42:40 2010
From: alex at moreati.org.uk (Alex Willmer)
Date: Mon, 15 Mar 2010 08:42:40 -0700 (PDT)
Subject: EuroPython 2010 - Open for registration and reminder of participation
Message-ID: <a3c094b1-5958-467d-8e2e-a82ecffbe05f@g4g2000yqa.googlegroups.com>

EuroPython 2010 - 17th to 24th July 2010
----------------------------------------

EuroPython is a conference for the Python programming language
community, including the Django, Zope and Plone communities. It is
aimed at everyone in the Python community, of all skill levels, both
users and programmers.

Last year's conference was the largest open source conference in the
UK and one of the largest community organised software conferences in
Europe.

This year EuroPython will be held from the 17th to 24th July in
Birmingham, UK. It will include over 100 talks, tutorials, sprints and
social events.

Registration
------------

Registration is open now at: http://www.europython.eu/registration/

For the best registration rates, book as soon as you can! Extra Early
Bird closes soon, after which normal Early Bird rate will apply until
10th May

Talks, Activities and Events
----------------------------

Do you have something you wish to present at EuroPython? You want to
give a talk, run a tutorial or sprint?

Go to http://www.europython.eu/talks/cfp/ for information and advice!
Go to http://wiki.europython.eu/Sprints to plan a sprint!

Help Us Out
-----------

EuroPython is run by volunteers, like you! We could use a hand, and
any contribution is welcome.

Go to http://wiki.europython.eu/Helping to join us!
Go to http://www.europython.eu/contact/ to contact us directly!

Sponsors
--------

Sponsoring EuroPython is a unique opportunity to affiliate with this
prestigious conference and to reach a large number of Python users
from computing professionals to academics, from entrepreneurs to
motivated and well-educated job seekers.

http://www.europython.eu/sponsors/

Spread the Word
---------------

We are a community-run not-for-profit conference. Please help to
spread the word by distributing this announcement to colleagues,
project mailing lists, friends, your blog, Web site, and through your
social networking connections. Take a look at our publicity resources:

http://wiki.europython.eu/Publicity

General Information
-------------------

For more information about the conference, please visit the official
site: http://www.europython.eu/

Looking forward to see you!

The EuroPython Team


From python at mrabarnett.plus.com  Mon Mar 15 11:44:43 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Mon, 15 Mar 2010 15:44:43 +0000
Subject: File existence check with partial filename
In-Reply-To: <ee9ad2071003150357y448f2ccej80462f35910d08e2@mail.gmail.com>
References: <C7C2FE43.5AB0%Sang-Ho.Yun@jpl.nasa.gov>	<hnkcqh$avd$1@news.eternal-september.org>
	<ee9ad2071003150357y448f2ccej80462f35910d08e2@mail.gmail.com>
Message-ID: <4B9E55EB.7080802@mrabarnett.plus.com>

Lan Qing wrote:
> Or use the regular module:
> 
> import re
> import os
> 
> for filename in os.listdir('.'):
>     if re.match("*HV*", filename):
>           # do something with the file
> 
The regular expression should be ".*HV.*", although:

     re.search("HV", filename)

would be better and:

     "HV" in filename.upper()

would be even better, as Alf posted.

> On Mon, Mar 15, 2010 at 12:24 PM, Alf P. Steinbach <alfps at start.no 
> <mailto:alfps at start.no>> wrote:
> 
>     * Sang-Ho Yun:
> 
>         I learned that I can check the existence of a file using
>         os.path.isfile("filename").
> 
>         What if I need to check if there is a file that contains "HV" in the
>         filename?  What should I do?
> 
> 
>     <code>
>        from __future__ import print_function
>        import os
> 
>        for filename in os.listdir( "." ):
>            if "HV" in filename.upper():
>                print( filename )
>     </code>
> 
> 
>     Cheers & hth.,
> 
>     - Alf
> 
>     -- 
>     http://mail.python.org/mailman/listinfo/python-list
> 
> 



From python at mrabarnett.plus.com  Mon Mar 15 11:51:25 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Mon, 15 Mar 2010 15:51:25 +0000
Subject: Large regular expressions
In-Reply-To: <b32951aa1003150521s22d1642cvbb78062f1fe3ed59@mail.gmail.com>
References: <b32951aa1003150521s22d1642cvbb78062f1fe3ed59@mail.gmail.com>
Message-ID: <4B9E577D.8040905@mrabarnett.plus.com>

Nathan Harmston wrote:
> Hi,
> 
> So I m trying to use a very large regular expression, basically I have
> a list of items I want to find in text, its kind of a conjunction of
> two regular expressions and a big list......not pretty. However
> everytime I try to run my code I get this exception:
> 
> OverflowError: regular expression code size limit exceeded
> 
> I understand that there is a Python imposed limit on the size of the
> regular expression. And although its not nice I have a machine with
> 12Gb of RAM just waiting to be used, is there anyway I can alter
> Python to allow big regular expressions?
> 
> Could anyone suggest other methods of these kind of string matching in
> Python? I m trying to see if my swigged alphabet trie is faster than
> whats possible in Python!
> 
There's the regex module at http://pypi.python.org/pypi/regex. It'll
even release the GIL while matching on strings! :-)


From elias.bachaalany at gmail.com  Mon Mar 15 12:39:50 2010
From: elias.bachaalany at gmail.com (lallous)
Date: Mon, 15 Mar 2010 09:39:50 -0700 (PDT)
Subject: to pass self or not to pass self
Message-ID: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>

Hello,

Learning Python from the help file and online resources can leave one
with many gaps. Can someone comment on the following:

# ---------
class X:
    T = 1

    def f1(self, arg):
        print "f1, arg=%d" % arg
    def f2(self, arg):
        print "f2, arg=%d" % arg
    def f3(self, arg):
        print "f3, arg=%d" % arg

    # this:
    F = f2
    # versus this:
    func_tbl = { 1: f1, 2: f2, 3: f3 }

    def test1(self, n, arg):
        # why passing 'self' is needed?
        return self.func_tbl[n](self, arg)

    def test2(self):
        f = self.f1
        f(6)

        f = self.F
        # why passing self is not needed?
        f(87)

# ---------
x = X()

x.test1(1, 5)
print '----------'
x.test2()

Why in test1() when it uses the class variable func_tbl we still need
to pass self, but in test2() we don't ?

What is the difference between the reference in 'F' and 'func_tbl' ?

Thanks,
Elias


From constant.beta at gmail.com  Mon Mar 15 12:56:39 2010
From: constant.beta at gmail.com (Michal Kwiatkowski)
Date: Mon, 15 Mar 2010 09:56:39 -0700 (PDT)
Subject: Arguments and a return value of a C function call when using 
	setprofile
Message-ID: <a10dfeda-9917-4d59-a13a-5bb0b58429da@i25g2000yqm.googlegroups.com>

Hi,

I'm trying to write code that will trace arguments and return values
of all function calls. Using sys.settrace with 'call' and 'return'
events works great for Python functions, but now I want to extend that
to C functions as well. Using sys.setprofile instead in theory gives
me what I need ('c_call' and 'c_return'), but I'm stuck on getting
actual arguments and return values.

A snippet of code is worth a thousand words, so here it is:

import inspect
import sys

def trace(frame, event, arg):
    if event == 'call':
        print "CALL", frame.f_code.co_name, "arguments:",
inspect.getargvalues(frame)
    elif event == 'return':
        print "RETURN", frame.f_code.co_name, "return value:", arg
    elif event == 'c_call':
        print "C_CALL", arg.__name__, "???"
    elif event == 'c_return':
        print "C_RETURN", arg.__name__, "???"

def func(x):
    return x+1

sys.setprofile(trace)
func(1) # Python function
repr(2) # C function
sys.setprofile(None)

For a 'c_call' event the trace function is called *before* the call,
so frame is still in the context of the caller. 'c_return' event is
invoked *after* the function has returned, so I don't get the return
value here either. That's why I can't use inspect.getargvalues in
those cases. Is there any other way I could get arguments and a return
value of a C function call?

Cheers,
mk


From steve at holdenweb.com  Mon Mar 15 13:06:45 2010
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 15 Mar 2010 13:06:45 -0400
Subject: Python for newbies (Pythno users group in Macedonia)
In-Reply-To: <28u177-m9j.ln1@archaeopteryx.softver.org.mk>
References: <hpgq67-gai.ln1@archaeopteryx.softver.org.mk>	<mailman.702.1268486707.23598.python-list@python.org>
	<28u177-m9j.ln1@archaeopteryx.softver.org.mk>
Message-ID: <hnlpgj$5h3$1@dough.gmane.org>

?????? ??????????? wrote:
>> If you are all English-speakers then perhaps you could consider
>> showing a PyCon video - see
>>
>>   http://pycon.blip.tv
> 
> That's certainly something I'm considering for the more advanced users
> 
>> Good luck with the group. I hope to see PyCon Macedonia emerging
>> before too long!
> 
> Thanks :)
> I guess we'd have to wait a decade or so for a PyCon here 
> 
You might be surprised. Python is really taking off right now.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Mon Mar 15 13:09:46 2010
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 15 Mar 2010 13:09:46 -0400
Subject: Fwd: Some PyCon videos won't play
In-Reply-To: <ee9ad2071003142344w7aa3607di24639a5c5b7c4aaf@mail.gmail.com>
References: <SNT106-W28E9678F29E5527CFCBB88B1300@phx.gbl>	<mailman.716.1268506909.23598.python-list@python.org>	<hniugj$b36$1@get-news01.get.basefarm.net>	<hnjakh$mcv$1@dough.gmane.org>
	<hnjjt5$jsk$1@dough.gmane.org>
	<ee9ad2071003142344w7aa3607di24639a5c5b7c4aaf@mail.gmail.com>
Message-ID: <4B9E69DA.7080608@holdenweb.com>

Lan Qing wrote:
> In China these video can not watch at all. I must spent 3 days to
> download it...
> 
That's a great pity. If they would be useful to a large population
perhaps we could consider having copies hosted where they would be
available with higher bandwidth?

Who could we (the Python Software Foundation) discuss such a project with?

regards
 Steve

> On Mon, Mar 15, 2010 at 5:19 AM, Terry Reedy <tjreedy at udel.edu
> <mailto:tjreedy at udel.edu>> wrote:
> 
>     On 3/14/2010 2:41 PM, Terry Reedy wrote:
> 
>         On 3/14/2010 11:14 AM, David Boddie wrote:
> 
> 
>             You should still be able to get at the videos themselves by
>             inspecting
>             the page contents, looking for download links like this one:
> 
>             http://blip.tv/file/get/Pycon-PyCon2010UsingPythonToCreateRoboticSimulationsForPlaneta894.ogv
> 
> 
>             In this case, it's an Ogg Theora video file, so you may want
>             to use
>             a player like VLC to view it:
> 
> 
>         For people using html5 competant browsers, which, I believe,
>         play .ogv
>         'in tha page', blip.tv <http://blip.tv> just needs to update
>         site to make html5 pages an
>         alternative to using the flash player.
> 
> 
>     Actually, for FF3.6, at least, the problem is already solved. I just
>     click on the download button and FF recognizes .ogv as something it
>     can play and it does, replacing the flash player. The FF player
>     lacks a full-screen button, but that is rarely needed for the talks.
> 
>     tjr
> 
> 
> 
> 
>     -- 
>     http://mail.python.org/mailman/listinfo/python-list
> 
> 


-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From martin.schmidt1 at gmail.com  Mon Mar 15 13:16:01 2010
From: martin.schmidt1 at gmail.com (Martin Schmidt)
Date: Mon, 15 Mar 2010 13:16:01 -0400
Subject: extract occurrence of regular expression from elements of XML 
	documents
Message-ID: <5444f9711003151016m39af59efg3ed38d2ac90f93c1@mail.gmail.com>

Hi,

I have just started to use Python a few weeks ago and until last week I had
no knowledge of XML.
Obviously my programming knowledge is pretty basic.
Now I would like to use Python in combination with ca. 2000 XML documents
(about 30 kb each) to search for certain regular expression within specific
elements of these documents.
I would then like to record the number of occurrences of the regular
expression within these elements.
Moreover I would like to count the total number of words contained within
these, and record the attribute of a higher level element that contains
them.
I was trying to figure out the best way how to do this, but got overwhelmed
by the available information (e.g. posts using different approaches based on
dom, sax, xpath, elementtree, expat).
The outcome should be a file that lists the extracted attribute, the number
of occurrences of the regular expression, and the total number of words.
I did not find a post that addresses my problem.
If someone could help me with this I would really appreciate it.

  Martin
-------------- next part --------------
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From howe.steven at gmail.com  Mon Mar 15 13:20:10 2010
From: howe.steven at gmail.com (Steven Howe)
Date: Mon, 15 Mar 2010 10:20:10 -0700
Subject: File existence check with partial filename
In-Reply-To: <4B9E55EB.7080802@mrabarnett.plus.com>
References: <C7C2FE43.5AB0%Sang-Ho.Yun@jpl.nasa.gov>	<hnkcqh$avd$1@news.eternal-september.org>	<ee9ad2071003150357y448f2ccej80462f35910d08e2@mail.gmail.com>
	<4B9E55EB.7080802@mrabarnett.plus.com>
Message-ID: <4B9E6C4A.20509@gmail.com>

What wrong with glob?
-----------------------
Help on module glob:

NAME
     glob - Filename globbing utility.

FILE
     /usr/lib64/python2.6/glob.py

FUNCTIONS
     glob(pathname)
         Return a list of paths matching a pathname pattern.

         The pattern may contain simple shell-style wildcards a la fnmatch.

     iglob(pathname)
         Return an iterator which yields the paths matching a pathname 
pattern.

         The pattern may contain simple shell-style wildcards a la fnmatch.

DATA
     __all__ = ['glob', 'iglob']

-------------------
solution:

import glob

for afile in glob.iglob( "/home/buddy/*.HV" ):
     print afile


sph


On 03/15/2010 08:44 AM, MRAB wrote:
> Lan Qing wrote:
>> Or use the regular module:
>>
>> import re
>> import os
>>
>> for filename in os.listdir('.'):
>>     if re.match("*HV*", filename):
>>           # do something with the file
>>
> The regular expression should be ".*HV.*", although:
>
>     re.search("HV", filename)
>
> would be better and:
>
>     "HV" in filename.upper()
>
> would be even better, as Alf posted.
>
>> On Mon, Mar 15, 2010 at 12:24 PM, Alf P. Steinbach <alfps at start.no 
>> <mailto:alfps at start.no>> wrote:
>>
>>     * Sang-Ho Yun:
>>
>>         I learned that I can check the existence of a file using
>>         os.path.isfile("filename").
>>
>>         What if I need to check if there is a file that contains "HV" 
>> in the
>>         filename?  What should I do?
>>
>>
>> <code>
>>        from __future__ import print_function
>>        import os
>>
>>        for filename in os.listdir( "." ):
>>            if "HV" in filename.upper():
>>                print( filename )
>> </code>
>>
>>
>>     Cheers & hth.,
>>
>>     - Alf
>>
>>     --     http://mail.python.org/mailman/listinfo/python-list
>>
>>
>



From steve at holdenweb.com  Mon Mar 15 13:29:51 2010
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 15 Mar 2010 13:29:51 -0400
Subject: extract occurrence of regular expression from elements of XML
	documents
In-Reply-To: <5444f9711003151016m39af59efg3ed38d2ac90f93c1@mail.gmail.com>
References: <5444f9711003151016m39af59efg3ed38d2ac90f93c1@mail.gmail.com>
Message-ID: <hnlqru$9ol$1@dough.gmane.org>

Martin Schmidt wrote:
> Hi,
> 
> I have just started to use Python a few weeks ago and until last week I
> had no knowledge of XML.
> Obviously my programming knowledge is pretty basic.
> Now I would like to use Python in combination with ca. 2000 XML
> documents (about 30 kb each) to search for certain regular expression
> within specific elements of these documents.
> I would then like to record the number of occurrences of the regular
> expression within these elements.
> Moreover I would like to count the total number of words contained
> within these, and record the attribute of a higher level element that
> contains them.
> I was trying to figure out the best way how to do this, but got
> overwhelmed by the available information (e.g. posts using different
> approaches based on dom, sax, xpath, elementtree, expat).
> The outcome should be a file that lists the extracted attribute, the
> number of occurrences of the regular expression, and the total number of
> words.
> I did not find a post that addresses my problem.
> If someone could help me with this I would really appreciate it.
> 
You would get more specific help if you could post an example of the XML
and describe the regex searching you want to do in a little more detail,
I suspect.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From joel.pendery at gmail.com  Mon Mar 15 13:37:34 2010
From: joel.pendery at gmail.com (Joel Pendery)
Date: Mon, 15 Mar 2010 10:37:34 -0700 (PDT)
Subject: subtraction is giving me a syntax error
Message-ID: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>

So I am trying to write a bit of code and a simple numerical
subtraction

y_diff = y_diff-H

is giving me the error

Syntaxerror: Non-ASCII character '\x96' in file on line 70, but no
encoding declared.

Even though I have deleted some lines before it and this line is no
longer line 70, I am still getting the error every time.  I have tried
to change the encoding of the file to utf-8 but to no avail, I still
am having this issue.  Any ideas?

Thanks in advance


From tomf.sessile at gmail.com  Mon Mar 15 13:42:41 2010
From: tomf.sessile at gmail.com (TomF)
Date: Mon, 15 Mar 2010 10:42:41 -0700
Subject: to pass self or not to pass self
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
Message-ID: <2010031510424116807-tomfsessile@gmailcom>

On 2010-03-15 09:39:50 -0700, lallous <elias.bachaalany at gmail.com> said:

> Hello,
> 
> Learning Python from the help file and online resources can leave one
> with many gaps. Can someone comment on the following:
> 
> # ---------
> class X:
>     T = 1
> 
>     def f1(self, arg):
>         print "f1, arg=%d" % arg
>     def f2(self, arg):
>         print "f2, arg=%d" % arg
>     def f3(self, arg):
>         print "f3, arg=%d" % arg
> 
>     # this:
>     F = f2
>     # versus this:
>     func_tbl = { 1: f1, 2: f2, 3: f3 }
> 
>     def test1(self, n, arg):
>         # why passing 'self' is needed?
>         return self.func_tbl[n](self, arg)
> 
>     def test2(self):
>         f = self.f1
>         f(6)
> 
>         f = self.F
>         # why passing self is not needed?
>         f(87)
> 
> # ---------
> x = X()
> 
> x.test1(1, 5)
> print '----------'
> x.test2()
> 
> Why in test1() when it uses the class variable func_tbl we still need
> to pass self, but in test2() we don't ?
> 
> What is the difference between the reference in 'F' and 'func_tbl' ?

I recommend putting print statements into your code like this:

    def test1(self, n, arg):
        print "In test1, I'm calling a %s" % self.func_tbl[n]
        return self.func_tbl[n](self, arg)

    def test2(self):
        f = self.f1
        print "Now in test2, I'm calling a %s" % f
        f(6)


Bottom line: You're calling different things.  Your func_tbl is a dict 
of functions, not methods.

-Tom



From R.Brodie at rl.ac.uk  Mon Mar 15 13:42:50 2010
From: R.Brodie at rl.ac.uk (Richard Brodie)
Date: Mon, 15 Mar 2010 17:42:50 -0000
Subject: subtraction is giving me a syntax error
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
Message-ID: <hnlriq$7or$1@south.jnrs.ja.net>


"Joel Pendery" <joel.pendery at gmail.com> wrote in message 
news:56597268-3472-4fd9-a829-6d9cf51cf093 at e7g2000yqf.googlegroups.com...

>> y_diff = y_diff-H
>
> Syntaxerror: Non-ASCII character '\x96' in file on line 70, but no
> encoding declared.

That's likely an en-dash, not a minus sign. 




From benjamin.kaplan at case.edu  Mon Mar 15 13:48:08 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Mon, 15 Mar 2010 13:48:08 -0400
Subject: subtraction is giving me a syntax error
In-Reply-To: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
Message-ID: <ec96e1391003151048m17ee8845qf350b7d309f4a80e@mail.gmail.com>

On Mon, Mar 15, 2010 at 1:37 PM, Joel Pendery <joel.pendery at gmail.com>wrote:

> So I am trying to write a bit of code and a simple numerical
> subtraction
>
> y_diff = y_diff-H
>
> is giving me the error
>
> Syntaxerror: Non-ASCII character '\x96' in file on line 70, but no
> encoding declared.
>
> Even though I have deleted some lines before it and this line is no
> longer line 70, I am still getting the error every time.  I have tried
> to change the encoding of the file to utf-8 but to no avail, I still
> am having this issue.  Any ideas?
>
> Thanks in advance
>

It's not UTF-8. My guess would be that you're on Windows and it's a dash
character in cp1252. The actual minus sign is 0x2D. Your editor must be
putting in the wrong character.
-------------- next part --------------
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From philip at semanchuk.com  Mon Mar 15 13:48:54 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Mon, 15 Mar 2010 13:48:54 -0400
Subject: subtraction is giving me a syntax error
In-Reply-To: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
Message-ID: <3620300A-6BDB-40DA-98D0-9FB1D4E4B071@semanchuk.com>


On Mar 15, 2010, at 1:37 PM, Joel Pendery wrote:

> So I am trying to write a bit of code and a simple numerical
> subtraction
>
> y_diff = y_diff-H
>
> is giving me the error
>
> Syntaxerror: Non-ASCII character '\x96' in file on line 70, but no
> encoding declared.
>
> Even though I have deleted some lines before it and this line is no
> longer line 70, I am still getting the error every time.  I have tried
> to change the encoding of the file to utf-8 but to no avail, I still
> am having this issue.  Any ideas?


0x96 is the Win1252 minus sign character. Did you copy & paste this  
code from a Web browser or a word processor?

Delete the character between "y_diff" and "H" and replace it with a  
plain ASCII subtraction sign.







From python at mrabarnett.plus.com  Mon Mar 15 14:00:42 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Mon, 15 Mar 2010 18:00:42 +0000
Subject: subtraction is giving me a syntax error
In-Reply-To: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
Message-ID: <4B9E75CA.4010203@mrabarnett.plus.com>

Joel Pendery wrote:
> So I am trying to write a bit of code and a simple numerical
> subtraction
> 
> y_diff = y_diff-H
> 
> is giving me the error
> 
> Syntaxerror: Non-ASCII character '\x96' in file on line 70, but no
> encoding declared.
> 
> Even though I have deleted some lines before it and this line is no
> longer line 70, I am still getting the error every time.  I have tried
> to change the encoding of the file to utf-8 but to no avail, I still
> am having this issue.  Any ideas?
> 
> Thanks in advance

Character '\x96' is an en-dash, which looks like a hyphen/minus sign
'-', but isn't.


From rami.chowdhury at gmail.com  Mon Mar 15 14:01:00 2010
From: rami.chowdhury at gmail.com (Rami Chowdhury)
Date: Mon, 15 Mar 2010 11:01:00 -0700
Subject: to pass self or not to pass self
In-Reply-To: <2010031510424116807-tomfsessile@gmailcom>
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<2010031510424116807-tomfsessile@gmailcom>
Message-ID: <201003151101.01118.rami.chowdhury@gmail.com>

On Monday 15 March 2010 10:42:41 TomF wrote:
> On 2010-03-15 09:39:50 -0700, lallous <elias.bachaalany at gmail.com> said:
> >     
> > Why in test1() when it uses the class variable func_tbl we still need
> > to pass self, but in test2() we don't ?
> > 
> > What is the difference between the reference in 'F' and 'func_tbl' ?
> 
> I recommend putting print statements into your code like this:
> 
>     def test1(self, n, arg):
>         print "In test1, I'm calling a %s" % self.func_tbl[n]
>         return self.func_tbl[n](self, arg)
> 
>     def test2(self):
>         f = self.f1
>         print "Now in test2, I'm calling a %s" % f
>         f(6)
> 
> 
> Bottom line: You're calling different things.  Your func_tbl is a dict
> of functions, not methods.
> 
> -Tom

To build on that a bit, note that in test2() you are doing:
> >         f = self.f1
> >         f(6)
> >         
> >         f = self.F
> >         # why passing self is not needed?
> >         f(87)

As I understand it, since you obtained the reference to 'f1' from 'self', you 
got it as a bound rather than an unbound method. So 'self' is automatically 
passed in as the first argument. 

----
Rami Chowdhury
"Given enough eyeballs, all bugs are shallow." -- Linus' Law
408-597-7068 (US) / 07875-841-046 (UK) / 01819-245544 (BD)


From invalid at invalid.invalid  Mon Mar 15 14:09:29 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Mon, 15 Mar 2010 18:09:29 +0000 (UTC)
Subject: subtraction is giving me a syntax error
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
	<mailman.800.1268675343.23598.python-list@python.org>
Message-ID: <hnlt4p$4j1$1@reader1.panix.com>

On 2010-03-15, Philip Semanchuk <philip at semanchuk.com> wrote:
> On Mar 15, 2010, at 1:37 PM, Joel Pendery wrote:
>
>> So I am trying to write a bit of code and a simple numerical
>> subtraction
>>
>> y_diff = y_diff-H
>>
>> is giving me the error
>>
>> Syntaxerror: Non-ASCII character '\x96' in file on line 70, but no
>> encoding declared.
[...]
>
> 0x96 is the Win1252 minus sign character. Did you copy & paste this 
> code from a Web browser or a word processor?
>
> Delete the character between "y_diff" and "H" and replace it with a 
> plain ASCII subtraction sign.

I think somebody needs to stop editing his code with MS Word and start
using a programming editor. ;)

-- 
Grant Edwards               grant.b.edwards        Yow! Make me look like
                                  at               LINDA RONSTADT again!!
                              gmail.com            


From jeanmichel at sequans.com  Mon Mar 15 14:24:38 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 15 Mar 2010 19:24:38 +0100
Subject: class inheritance
In-Reply-To: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
Message-ID: <4B9E7B66.10702@sequans.com>

JLundell wrote:
> I've got a subclass of fractions.Fraction called Value; it's a mostly
> trivial class, except that it overrides __eq__ to mean 'nearly equal'.
> However, since Fraction's operations result in a Fraction, not a
> Value, I end up with stuff like this:
>
> x = Value(1) + Value(2)
>
> where x is now a Fraction, not a Value, and x == y uses
> Fraction.__eq__ rather than Value.__eq__.
>
> This appears to be standard Python behavior (int does the same thing).
> I've worked around it by overriding __add__, etc, with functions that
> invoke Fraction but coerce the result. But that's tedious; there are a
> lot of methods to override.
>
> So I'm wondering: is there a more efficient way to accomplish what I'm
> after?
>   
I would change the approach.
To the question, "*is* a Value a Fraction", some may tempted to answer 
"No" (for instance, a fraction has a denominator, a value has not).
However "Does a Fraction *have* a Value", you could possibly say "Yes".

The value may be then an attribute of the class Fraction, not a subclass.
To test fraction equality, use F1 == F2. In order to test 'nearly 
equality', use F1.val() == F2.val().

JM






From jeanmichel at sequans.com  Mon Mar 15 14:25:00 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 15 Mar 2010 19:25:00 +0100
Subject: staticmethod and setattr
In-Reply-To: <1268663020.10067.35.camel@laptop>
References: <1268663020.10067.35.camel@laptop>
Message-ID: <4B9E7B7C.8050701@sequans.com>

Am Montag, den 15.03.2010, 05:42 -0700 schrieb Michael.Lausch:
>> On Mar 15, 11:40 am, Steven D'Aprano <st... at REMOVE-THIS-
>> cybersource.com.au> wrote:
>>     
>>> On Mon, 15 Mar 2010 01:43:02 -0700, Michael.Lausch wrote:
>>>       
>>>> Hi,
>>>>         
>>>> I managed to get confused by Python, which is not such an easy task.
>>>>         
>>>> The problem i have is rooted in marshalling, JSON and Dojo. I need some
>>>> static class in function with the name "$ref" i tried:
>>>> class Foo(object):
>>>>     @staticmethod
>>>>     def _ref(o):
>>>>          pass
>>>>         
>>>> setattr(Foo, "$ref", Foo._ref)
>>>>         
>>> That doesn't work as expected:
>>>
>>>       
>>>>>> Foo.__dict__['_ref'] is Foo.__dict__['$ref']
>>>>>>             
>>> False
>>>
>>> Try this instead:
>>>
>>>       
>>>>>> setattr(Foo, "$ref", Foo.__dict__['_ref'])
>>>>>> Foo.__dict__['_ref'] is Foo.__dict__['$ref']
>>>>>>             
>>> True
>>>       
>> Now I'm trying to understand why this is the case.
>> How is Foo.__dict__['_ref']  different from Foo._ref?
>> Shouldn't it return the same attribute?
>>
>> And after further experiments i found out that a making
>> Foo._ref a classmethod does work with my first approach.
>>
>>     

When you declared _ref as static, a static object has been stored in Foo.
Using Foo.__dict__ you can access this static object, which is *not* the 
_ref function
Using Foo._ref, you trigger the lookup mechanism which do much more than 
accessing the dict. Especially, if it finds a __get__ method in the 
object, it will return the __get__ result instead of the object itself.

Foo._ref is equivalent in your case to 
Foo.__dict__['_ref'].__get__(None, Foo)


JM




From jeanmichel at sequans.com  Mon Mar 15 14:39:31 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 15 Mar 2010 19:39:31 +0100
Subject: "Breaking" the __main__ script
In-Reply-To: <hnjihi$eur$1@dough.gmane.org>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com><mailman.726.1268567615.23598.python-list@python.org>	<hnik9k$ju1$1@news.urz.uni-heidelberg.de><mailman.733.1268579034.23598.python-list@python.org>	<hnjdpj$nk8$1@news.urz.uni-heidelberg.de>	<1268597301.21932.1364768439@webmail.messagingengine.com>
	<hnjihi$eur$1@dough.gmane.org>
Message-ID: <4B9E7EE3.6000807@sequans.com>

Steve Holden wrote:
> python at bdurham.com wrote:
>   
>>>> Any reason you prefer PDB over WinPDB?
>>>> http://winpdb.org/
>>>>         
>>> Yes. I don't have Windows except one one PC :P
>>>       
>> WinPDB runs on non-Windows platforms :)
>>
>>     
> One might reasonably argue that it has a pretty couter-intuitive name, then.
>
> regards
>  Steve
>   
'Win' may stand for Winner, not Windows :D

JM


From jeanmichel at sequans.com  Mon Mar 15 14:41:18 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 15 Mar 2010 19:41:18 +0100
Subject: "Breaking" the __main__ script
In-Reply-To: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com>
Message-ID: <4B9E7F4E.4040900@sequans.com>

vsoler wrote:
> Hello,
>
> I am still learning python, thus developnig small scripts.
>
> Some of them consist only of the main module. While testing them
> (debugging) I sometimes want to stop the script at a certain point,
> with something like    stop, break, end   or something similar.
>
> What statement can I use?
>
> Vicente Soler
>   
import bdb

pdb.set_trace() # put this line anywhere you want a breakpoint in your code.

type n for next, c for continue, s for step into and google for 'python 
pdb' for the details.

JM


From baptiste13z at free.fr  Mon Mar 15 14:43:53 2010
From: baptiste13z at free.fr (Baptiste Carvello)
Date: Mon, 15 Mar 2010 19:43:53 +0100
Subject: subtraction is giving me a syntax error
In-Reply-To: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
Message-ID: <hnlv60$t71$1@dough.gmane.org>

Joel Pendery a ?crit :
> So I am trying to write a bit of code and a simple numerical
> subtraction
> 
> y_diff = y_diff-H
> 
> is giving me the error
> 
> Syntaxerror: Non-ASCII character '\x96' in file on line 70, but no
> encoding declared.
> 
> Even though I have deleted some lines before it and this line is no
> longer line 70, I am still getting the error every time.  I have tried
> to change the encoding of the file to utf-8 but to no avail, I still
> am having this issue.  Any ideas?
> 
> Thanks in advance

Hello,

I would say that when you press the minus key, your operating system doesn't 
encode the standard (ASCII) minus character, but some fancy character, which 
Python cannot interpret.

More precisely, I suspect you are unsing Windows with codepage 1252 (latin 1). 
With this encoding, you have 2 kinds of minus signs: the standard (45th 
character, in hex '\x2d') and the non-standard (150th character, in hex '\x96').

cf:
http://msdn.microsoft.com/en-us/library/cc195054.aspx

Cheers,
Baptiste



From jeanmichel at sequans.com  Mon Mar 15 14:50:18 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 15 Mar 2010 19:50:18 +0100
Subject: "Breaking" the __main__ script
In-Reply-To: <4B9E7F4E.4040900@sequans.com>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com>
	<4B9E7F4E.4040900@sequans.com>
Message-ID: <4B9E816A.7090608@sequans.com>

Jean-Michel Pichavant wrote:
> vsoler wrote:
>> Hello,
>>
>> I am still learning python, thus developnig small scripts.
>>
>> Some of them consist only of the main module. While testing them
>> (debugging) I sometimes want to stop the script at a certain point,
>> with something like    stop, break, end   or something similar.
>>
>> What statement can I use?
>>
>> Vicente Soler
>>   
> import bdb
>
> pdb.set_trace() # put this line anywhere you want a breakpoint in your 
> code.
>
> type n for next, c for continue, s for step into and google for 
> 'python pdb' for the details.
>
> JM
erratum

import pdb


From astley.lejasper at gmail.com  Mon Mar 15 15:10:21 2010
From: astley.lejasper at gmail.com (Astley Le Jasper)
Date: Mon, 15 Mar 2010 12:10:21 -0700 (PDT)
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>
	<mailman.619.1268324988.23598.python-list@python.org>
	<4B992FB5.8090207@v.loewis.de> 
	<4B9A2810.9030602@chamonix.reportlab.co.uk>
	<4B9A614C.1080105@chamonix.reportlab.co.uk> 
	<4B9A9624.7040200@v.loewis.de>
	<mailman.783.1268647151.23598.python-list@python.org>
Message-ID: <8aa22e57-f152-4dc7-88da-cf6879de41f7@q16g2000yqq.googlegroups.com>

Hi Robin,

It looks like you've been busy. I'm sorry but you are well over my
head at the moment!

:-)

If you need me to test an install then I'd be happy to help. However,
I just received an email from Christoph Gohlke saying:

" ... There are 64 bit versions of Reportlab and PIL for Python 2.6
for Windows available at http://www.lfd.uci.edu/~gohlke/pythonlibs/
..."

Regards

Neil




From dmitrey.kroshko at scipy.org  Mon Mar 15 15:13:29 2010
From: dmitrey.kroshko at scipy.org (dmitrey)
Date: Mon, 15 Mar 2010 12:13:29 -0700 (PDT)
Subject: [ANN] OpenOpt 0.28, FuncDesigner 0.18, DerApproximator 0.18
Message-ID: <4e6fa172-6edb-4c1a-bc9d-8ba334008101@d27g2000yqf.googlegroups.com>

Hi all,
I'm glad to inform you about new release of our free (BSD-licensed)
soft OpenOpt 0.28 (numerical optimization), FuncDesigner 0.18 (CAS
with automatic differentiation), DerApproximator 0.18 (finite-
differeces derivatives approximation).

More details here:
http://forum.openopt.org/viewtopic.php?id=222

Regards, D.


From philip at semanchuk.com  Mon Mar 15 15:38:54 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Mon, 15 Mar 2010 15:38:54 -0400
Subject: Clustering and automated configuration & deployment toolkit with
	Python
In-Reply-To: <003064f8-e559-41e9-8110-11fad8373d09@y17g2000yqd.googlegroups.com>
References: <003064f8-e559-41e9-8110-11fad8373d09@y17g2000yqd.googlegroups.com>
Message-ID: <577D1DA0-EAB5-4AC0-8C65-5E22CD56475C@semanchuk.com>


On Mar 13, 2010, at 6:21 PM, np map wrote:

> I'd like to write an open source clustering (for computation and
> general use) and automation of configuration/deployment in Python.
> It's main purpose is to be used in academic environments.
> It would be something like running numpy/simpy code (and other custom
> python code) on a set of machines in a distributed fashion (e.g.
> splitting tasks, doing certain bits on some machines, other sub-tasks
> on other machines, etc).

Hi np map,
Are you aware of ipython? My colleagues tell me that it contains some  
code for executing processes on remote machines. It sounds like code  
which you could build on or borrow from.

HTH
Philip



>
> The cluster could be used in at least two ways:
> - submit code/files via a web interface, monitor the task via the web
> interface and download the results from the master node  (user<>web
> interface<>master)
> - run code directly from another machine on the cluster (as if it were
> a subprocess or something like this)
>
>
> Requirements (so far):
> - support the Ubuntu Linux distribution in the initial iteration
> - be easy to extend to other OS-es and package managers
> - try to be 3.x compatible where dual compatibility is possible (2.x
> and 3.x)
> - it will support Python 2.5-2.6
> - document required changes to the 2.x only code to make it work on
> 3.x
> - make it easy to submit code directly from python scripts to the
> cluster (with the right credentials)
> - support key based authentication for job submission
> - should talk to at least one type of RDBMS to store various types of
> data
> - the cluster should be able to kill a task on nodes automatically if
> it executes for too long or requires too much memory (configurable)
> - should be modular (use automation & configuration or just
> clustering)
>
>
> Therefore, I'd like to know a few things:
>
> Is there a clustering toolkit already available for python?
>
> What would the recommended architecture be ?
>
> How should the "user" code interface with the clustering system's
> code?
>
> How should the results be stored (at the node and master level)?
>
> Should threading be supported in the tasks?
>
> How should they be returned to the Master node(s)? (polling, submitted
> by the nodes, etc)
>
> What libraries should be used for this? (e.g. fabric as a library,
> pyro, etc)
>
> Any other suggestions and pieces of advice?
>
> Should Fabric be used in this clustering system for automation? If
> not, what else? Would simply using a wrapper written in python for the
> 'ssh' app be ok?
>
> Would the following architecture be ok?
> Master: splits tasks into sub-tasks, sends them to nodes - provided
> the node's load isn't greater than a certain percentage, gets results,
> stores and provides configuration to nodes, stores results, etc
> Node: runs code, applies configuration, submits the results to the
> master, etc
>
> If this system actually gets python-level code submission inside, how
> should it work?
>
> The reason I posted this set of questions and ideas is that I'd like
> this to be as flexible and usable as possible.



From aahz at pythoncraft.com  Mon Mar 15 15:57:23 2010
From: aahz at pythoncraft.com (Aahz)
Date: 15 Mar 2010 12:57:23 -0700
Subject: When to lock data items returned by multiprocessing.Manager?
References: <4428d674-7fa7-4095-a93d-75ea31a81d9a@15g2000yqi.googlegroups.com>
Message-ID: <hnm3f3$6r3$1@panix5.panix.com>

In article <4428d674-7fa7-4095-a93d-75ea31a81d9a at 15g2000yqi.googlegroups.com>,
Veloz  <michaelveloz at gmail.com> wrote:
>
>So I'm using a multiprocessing.Manager instance in my main app and
>asking it to create a dictionary, which I am providing to instances of
>the application that I'm forking off with Process.
>
>The Processes and main app will be reading/writing to the dictionary.
>
>It's not clear to me what I have to "lock" and what I don't have to
>lock. Any ideas?

The way I deal with it is by making sure each key is only updated by a
single process.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From jkn_gg at nicorp.f9.co.uk  Mon Mar 15 16:52:16 2010
From: jkn_gg at nicorp.f9.co.uk (jkn)
Date: Mon, 15 Mar 2010 13:52:16 -0700 (PDT)
Subject: Reverse engineering CRC?
References: <7vj7fdFnnjU1@mid.individual.net> <kz88du.hk0@spenarnc.xs4all.nl> 
	<4B9E0C1F.9020003@canterbury.ac.nz>
Message-ID: <d5620f1a-b9f5-425b-b30e-b5a33712a760@t23g2000yqt.googlegroups.com>

Hi Greg
    Just to say thanks for taking the time to write up your work on
this interesting topic.

    Cheers
    J^n



From debatem1 at gmail.com  Mon Mar 15 16:57:23 2010
From: debatem1 at gmail.com (geremy condra)
Date: Mon, 15 Mar 2010 16:57:23 -0400
Subject: Reverse engineering CRC?
In-Reply-To: <4B9E0C1F.9020003@canterbury.ac.nz>
References: <7vj7fdFnnjU1@mid.individual.net> <kz88du.hk0@spenarnc.xs4all.nl>
	<4B9E0C1F.9020003@canterbury.ac.nz>
Message-ID: <f3cc57c61003151357q7d1c8bf4laff5b49f972d4ab3@mail.gmail.com>

On Mon, Mar 15, 2010 at 6:29 AM, Gregory Ewing
<greg.ewing at canterbury.ac.nz> wrote:
> I've solved the problem now.
>
> It turned out to be a very standard CRC algorithm, complicated
> by the presence of a few extra bytes of data being checked that
> didn't appear explicitly in the file anywhere.
>
> In the process I developed some very general techniques for
> solving this kind of problem, which I've written about here
> if anyone's interested:
>
> http://www.cosc.canterbury.ac.nz/greg.ewing/essays/CRC-Reverse-Engineering.html
>
> Thanks for everyone's help,
> Greg

Nice writeup, thanks.

Geremy Condra


From steve at REMOVE-THIS-cybersource.com.au  Mon Mar 15 18:33:33 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 15 Mar 2010 22:33:33 GMT
Subject: subtraction is giving me a syntax error
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
	<mailman.800.1268675343.23598.python-list@python.org>
	<hnlt4p$4j1$1@reader1.panix.com>
Message-ID: <4b9eb5bd$0$27822$c3e8da3@news.astraweb.com>

On Mon, 15 Mar 2010 18:09:29 +0000, Grant Edwards wrote:

>> Delete the character between "y_diff" and "H" and replace it with a
>> plain ASCII subtraction sign.
> 
> I think somebody needs to stop editing his code with MS Word and start
> using a programming editor. ;)


I've had this error myself, and I've never used Word to edit code. It can 
happen if you copy code from a website that "helpfully" converts hyphens 
to en-dashes, spaces to non-breaking spaces, or inserts ctrl-Z characters 
into strings, etc. They're a devil to debug.


-- 
Steven


From sjmachin at lexicon.net  Mon Mar 15 18:48:45 2010
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 15 Mar 2010 15:48:45 -0700 (PDT)
Subject: subtraction is giving me a syntax error
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
	<mailman.807.1268678671.23598.python-list@python.org>
Message-ID: <6e982a4f-ebef-4b91-957d-7b50895c7f5d@k18g2000prf.googlegroups.com>

On Mar 16, 5:43?am, Baptiste Carvello <baptiste... at free.fr> wrote:
> Joel Pendery a ?crit :

> > So I am trying to write a bit of code and a simple numerical
> > subtraction
>
> > y_diff = y_diff-H
>
> > is giving me the error
>
> > Syntaxerror: Non-ASCII character '\x96' in file on line 70, but no
> > encoding declared.
>
>
> I would say that when you press the minus key, your operating system doesn't
> encode the standard (ASCII) minus character, but some fancy character, which
> Python cannot interpret.

The likelihood that any operating system however brain-damaged and in
whatever locale would provide by default a "keyboard" or "input
method" that generated EN DASH when the '-' key is struck is somewhere
between zero and epsilon.

Already advanced theories like "used a word processor instead of a
programmer's editor" and "scraped it off the web" are much more
plausible.

> More precisely, I suspect you are unsing Windows with codepage 1252 (latin 1).

Codepage 1252 is not "latin1" in the generally accepted meaning of
"latin1" i.e. ISO-8859-1. It is a superset. MS in their wisdom or
otherwise chose to use most of the otherwise absolutely wasted slots
assigned to "C1 control characters" in latin1.

> With this encoding, you have 2 kinds of minus signs: the standard (45th
> character, in hex '\x2d') and the non-standard (150th character, in hex '\x96').
>
> cf:http://msdn.microsoft.com/en-us/library/cc195054.aspx

The above link quite correctly says that '\x96` maps to U+2013 EN
DASH. EN DASH is not any kind of minus sign.

Aside: the syndrome causing the problem is apparent with cp125x for x
in range(9)





From invalid at invalid.invalid  Mon Mar 15 18:56:19 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Mon, 15 Mar 2010 22:56:19 +0000 (UTC)
Subject: subtraction is giving me a syntax error
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
	<mailman.800.1268675343.23598.python-list@python.org>
	<hnlt4p$4j1$1@reader1.panix.com>
	<4b9eb5bd$0$27822$c3e8da3@news.astraweb.com>
Message-ID: <hnmduj$gnp$1@reader1.panix.com>

On 2010-03-15, Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> wrote:
> On Mon, 15 Mar 2010 18:09:29 +0000, Grant Edwards wrote:
>
>>> Delete the character between "y_diff" and "H" and replace it with a
>>> plain ASCII subtraction sign.
>> 
>> I think somebody needs to stop editing his code with MS Word and start
>> using a programming editor. ;)
>
> I've had this error myself, and I've never used Word to edit code. It can 
> happen if you copy code from a website that "helpfully" converts hyphens 
> to en-dashes, spaces to non-breaking spaces, or inserts ctrl-Z characters 
> into strings, etc. They're a devil to debug.

Though it may not be Microsoft Word, I think I'd still maintain that
an editor where you can't see a ctrl-Z or tell the difference between
an ASCII minus and a windows-codepage-whatever isn't a very good
programmer's editor.

-- 
Grant Edwards               grant.b.edwards        Yow! HUMAN REPLICAS are
                                  at               inserted into VATS of
                              gmail.com            NUTRITIONAL YEAST ...


From jlundell at pobox.com  Mon Mar 15 19:34:35 2010
From: jlundell at pobox.com (JLundell)
Date: Mon, 15 Mar 2010 16:34:35 -0700 (PDT)
Subject: class inheritance
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
	<9bb4c1e7-858e-4ee6-870b-5a6549b6c496@b36g2000pri.googlegroups.com>
Message-ID: <05d0d40f-3fa0-4095-875d-777b49122d12@l12g2000prg.googlegroups.com>

On Mar 13, 1:26?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> It's a tad unfortunately Python doesn't make this easier. ?If I had to
> do it more than once I'd probably write a mixin to do it:
>
> class ArithmeticSelfCastMixin(object):
> ? ? def __add__(self,other):
> ? ? ? ? return
> self.__class__(super(ArithmeticSelfCastMixin,self).__add__(other)
> ? ? # etc.
>
> class Value(ArithmeticSelfCastMixin,fraction.Fraction):
> ? ? pass
>
> However, I want to warn you about overriding __eq__ to mean "almost
> equal": it can have unexpected results so I don't recommend it. ?Two
> of the main issues with it are:
>
> 1. It violates the transitive property ("If A == B and B == C, then A
> == C") which most programmers expect to be true.
>
> 2. It will give unpredictable results when the objects are used in
> sets or as dictionary keys. ?Those thow types expect the transitive
> property to be true. ?If you are going to redefine __eq__ to mean
> "almost equal", then at least define __hash__ to raise
> NotImplementedError so that Python will refuse to use them in sets or
> as dictionary keys:
>
> ? ? def __hash__(self): raise NotImplementedError
>
> Carl Banks

It's also unfortunate that Python doesn't have an approximately-equal
operator; it'd come in handy for floating-point applications while
preserving hash. If only there were a ~= or ? operator I could
overload. And ~ is unary, so no joy.

My application is in that sense a little like a floating-point app, in
that it needs approximately-equal. And it doesn't need Value to be
hashable; thanks for the NotImplementedError suggestion; I've done
that as a safeguard.



From mail at hellmutweber.de  Mon Mar 15 19:36:01 2010
From: mail at hellmutweber.de (Hellmut Weber)
Date: Tue, 16 Mar 2010 00:36:01 +0100
Subject: logging: local functions ==> loss of lineno
In-Reply-To: <hnaj9c$i0u$02$1@news.t-online.com>
References: <mailman.576.1268256192.23598.python-list@python.org>
	<hnaj9c$i0u$02$1@news.t-online.com>
Message-ID: <4B9EC461.9090009@hellmutweber.de>

Am 11.03.2010 12:14, schrieb Peter Otten:
> Hellmut Weber wrote:
>
>> Logging works very well giving the filename and line number of the point
>> where it is called. As long as I use the loggers directly.
>> BUT when I have to wrap the logger call in some other function, I always
>> get file name and line number of the call of the logger inside the
>> wrapping function.
>>
>> Is there a possibility to get this information in this situation too?
>
> The official way is probably to write a custom Logger class that overrides
> the findCaller() method.
>
> Below is a hack that monkey-patches the logging._srcfile attribute to ignore
> user-specified modules in the call stack:
>
> $ cat wrapper.py
> import logging
> import os
> import sys
>
> logger = logging.getLogger()
>
> class SrcFile(object):
>      def __init__(self, exclude_files):
>          self.files = set(exclude_files)
>      def __eq__(self, other):
>          return other in self.files
>
> def fixname(filename):
>      if filename.lower().endswith((".pyc", ".pyo")):
>          filename = filename[:-4] + ".py"
>      return os.path.normcase(filename)
>
> if "--monkey" in sys.argv:
>      print "patching"
>      logging._srcfile = SrcFile([logging._srcfile, fixname(__file__)])
>
> def warn(*args, **kw):
>      logger.warn(*args, **kw)
>
> $ cat main.py
> import logging
> logging.basicConfig(format="%(filename)s<%(lineno)s>: %(message)s")
> import wrapper
> wrapper.warn("foo")
> wrapper.warn("bar")
> wrapper.warn("baz")
>
> $ python main.py
> wrapper.py<23>: foo
> wrapper.py<23>: bar
> wrapper.py<23>: baz
>
> $ python main.py --monkey
> patching
> main.py<4>: foo
> main.py<5>: bar
> main.py<6>: baz
>
> $ python -V
> Python 2.6.4
>
> Peter

Hi Peter,
thanks for your help ;-)

I've been offline for a few days so I found your message only today.
I'll try your proposal tomorrow.

Thanks again

Hellmut

-- 
Dr. Hellmut Weber         mail at hellmutweber.de
Degenfeldstra?e 2         tel   +49-89-3081172
D-80803 M?nchen-Schwabing mobil +49-172-8450321
please: No DOCs, no PPTs. why: tinyurl.com/cbgq



From pavlovevidence at gmail.com  Mon Mar 15 21:03:15 2010
From: pavlovevidence at gmail.com (Carl Banks)
Date: Mon, 15 Mar 2010 18:03:15 -0700 (PDT)
Subject: class inheritance
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
	<9bb4c1e7-858e-4ee6-870b-5a6549b6c496@b36g2000pri.googlegroups.com> 
	<05d0d40f-3fa0-4095-875d-777b49122d12@l12g2000prg.googlegroups.com>
Message-ID: <7088c1e1-9a1f-42d8-aac2-5ba19806165a@o30g2000yqb.googlegroups.com>

On Mar 15, 4:34?pm, JLundell <jlund... at pobox.com> wrote:
> It's also unfortunate that Python doesn't have an approximately-equal
> operator; it'd come in handy for floating-point applications while
> preserving hash. If only there were a ~= or ? operator I could
> overload. And ~ is unary, so no joy.

One problem with it is that there's no way to make it universal;
different appiplications have different ideas of close.  Conceivably
it could be usefully defined for a user type though..

Bacause of this problem almost no languages have an almost equal
operator.  I'm curious what languages do, of if there are any with a
trinary operator that also takes a threshold.

Carl Banks


From twistedphrame at gmail.com  Mon Mar 15 22:07:00 2010
From: twistedphrame at gmail.com (Jordan Apgar)
Date: Mon, 15 Mar 2010 19:07:00 -0700 (PDT)
Subject: Binary data transfer issue
Message-ID: <40c9fafc-a172-4c9c-ba21-35ac8a4029aa@z35g2000yqd.googlegroups.com>

Hi all,

I'm trying to transfer a binary file over xmlrpclib.   My test file is
a .jpeg file.  I can transfer all the data over but when I go to open
the .jpeg I get "Error interpreting JPEG image file (Invalid JPEG file
structure: SOS before SOF)"

here's the code:

===========Various Shared Functions========
#EncodeAES takes a Cipher c and encrypts a String s
EncodeAES = lambda c, s: base64.b64encode(c.encrypt(pad(s)))

#DecodeAES takes a Cipher C and decrypts the cyphertext e
    #then removes the padding from the decrypted string
DecodeAES = lambda c, e:
c.decrypt(base64.b64decode(e)).rstrip(PADDING)


CIPHER = AES.new("KEY")


# method to change strings back into tuples
def stringToTuple(string):
    if string[0] + string[-1] == "()":
        items = string[1:-1]
        items = items.split(',')
        return items
    else:
        raise ValueError("Badly formatted string (missing brackets).")

======client=================
 def Download(self, FileName, Data_Size=1024):
        ErrorCount = 0
        Pkt_Num = -1
        OldPkt_Num = Pkt_Num
        localFile = open("files/"+FileName, "wb")
        print
        print "Requesting First Packet"
        packet = self.client.download(EncodeAES(CIPHER, str(Pkt_Num)))
        if packet[0] == "False":
            print packet[1]
            return False
        packet = stringToTuple(DecodeAES(CIPHER, packet))
        if int(packet[0]) == -3:
            print "Received Error Packet"
        else:
            print "Received Packet: ", int(packet[0])

        print "packet[1], ", packet[2:-1]

        Pkt_Num = int(packet[0])

        while Pkt_Num >= 0 and ErrorCount <= 10:
            if (OldPkt_Num +1) == Pkt_Num:
                OldPkt_Num = OldPkt_Num +1
                localFile.write(binascii.
                                a2b_base64(packet[1][2:-1]))
#<<<<!!!!!<<< writing to the file on the client
                ErrorCount == 0
            else:
                ErrorCount = ErrorCount +1
                Pkt_Num = OldPkt_Num

            print "Requesting Packet: ", Pkt_Num +1
            packet = self.client.download(EncodeAES(CIPHER,
str(Pkt_Num)))
            packet = stringToTuple(DecodeAES(CIPHER, packet))
            Pkt_Num = int(packet[0])
            if int(packet[0]) == -3:
                print "Received Error Packet"
            elif int(packet[0]) == -2:
                print "Received EOF"
            else:
                print "Received Packet: ", int(packet[0])

        localFile.close()

        if Pkt_Num == -2:
            print packet[1][2:-1]
            return True
        elif Pkt_Num == -3:
            os.remove("files/"+FileName)
            print packet[1][2:-1]
            return False
        else:
            os.remove("files/"+FileName)
            print "Unexpected Packet: File Transfer Stopped"
            return False


==========Server Method=============
    def download(self, Pkt_Num):

        Old_Pkt_Num = self.PKT
        DataRate = self.DATA
        Pkt_Num = int(DecodeAES(CIPHER,Pkt_Num))
        if Pkt_Num == -1 and Old_Pkt_Num == -1:
            Pkt_Num = 0
            try:
                f = open("files/"+self.usr_dict[client][FILENAME],
"rb")
            except IOError:
                return EncodeAES(CIPHER,
                                 str((-3, "File Could Not be
opened")))
             data = binascii.b2a_base64(f.read((Pkt_Num+1 *
DataRate)))     #<<<<<<!!!!!!!<<<<<<<< reading from file
            f.close()
            self.usr_dict[client][PKT] = Pkt_Num
            return EncodeAES(CIPHER,
                             str((Pkt_Num, data)))

        elif Pkt_Num == Old_Pkt_Num:
            if Pkt_Num * DataRate >=
os.path.getsize("files/"+self.usr_dict[client][FILENAME]):
                return EncodeAES(CIPHER,
                             str((-2, "File Transfer Complete")))
            try:
                f = open("files/"+self.usr_dict[client][FILENAME],
"rb")
            except IOError:
               return EncodeAES(CIPHER,
                             str((-3, "File Could Not be opened")))
            data = f.read((Pkt_Num+1 * DataRate))
            data = None
            data = binascii.b2a_base64(f.read(DataRate))
#<<<<<<<<!!!!!!!<<<<<<< reading from file
            f.close()
            self.usr_dict[client][PKT] = Pkt_Num +1

            return EncodeAES(CIPHER,
                            str((Pkt_Num+1, data)))

      else:

            return EncodeAES(CIPHER,
                             str((-3, "Incorrect Packet Requested")))



Thank you all for the help,  I know there are better ways and transfer
protocol modules to but I'd like to do this without them.

~Jordan


From python at mrabarnett.plus.com  Mon Mar 15 23:07:37 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 16 Mar 2010 03:07:37 +0000
Subject: Binary data transfer issue
In-Reply-To: <40c9fafc-a172-4c9c-ba21-35ac8a4029aa@z35g2000yqd.googlegroups.com>
References: <40c9fafc-a172-4c9c-ba21-35ac8a4029aa@z35g2000yqd.googlegroups.com>
Message-ID: <4B9EF5F9.5010005@mrabarnett.plus.com>

Jordan Apgar wrote:
> Hi all,
> 
> I'm trying to transfer a binary file over xmlrpclib.   My test file is
> a .jpeg file.  I can transfer all the data over but when I go to open
> the .jpeg I get "Error interpreting JPEG image file (Invalid JPEG file
> structure: SOS before SOF)"
> 
> here's the code:
> 
> ===========Various Shared Functions========
> #EncodeAES takes a Cipher c and encrypts a String s
> EncodeAES = lambda c, s: base64.b64encode(c.encrypt(pad(s)))
> 
> #DecodeAES takes a Cipher C and decrypts the cyphertext e
>     #then removes the padding from the decrypted string
> DecodeAES = lambda c, e:
> c.decrypt(base64.b64decode(e)).rstrip(PADDING)
> 
> 
> CIPHER = AES.new("KEY")
> 
> 
> # method to change strings back into tuples
> def stringToTuple(string):
>     if string[0] + string[-1] == "()":
>         items = string[1:-1]
>         items = items.split(',')
>         return items
>     else:
>         raise ValueError("Badly formatted string (missing brackets).")
> 
> ======client=================
>  def Download(self, FileName, Data_Size=1024):
>         ErrorCount = 0
>         Pkt_Num = -1
>         OldPkt_Num = Pkt_Num
>         localFile = open("files/"+FileName, "wb")
>         print
>         print "Requesting First Packet"
>         packet = self.client.download(EncodeAES(CIPHER, str(Pkt_Num)))
>         if packet[0] == "False":
>             print packet[1]
>             return False
>         packet = stringToTuple(DecodeAES(CIPHER, packet))
>         if int(packet[0]) == -3:
>             print "Received Error Packet"
>         else:
>             print "Received Packet: ", int(packet[0])
> 
>         print "packet[1], ", packet[2:-1]
> 
>         Pkt_Num = int(packet[0])
> 
>         while Pkt_Num >= 0 and ErrorCount <= 10:
>             if (OldPkt_Num +1) == Pkt_Num:
>                 OldPkt_Num = OldPkt_Num +1
>                 localFile.write(binascii.
>                                 a2b_base64(packet[1][2:-1]))
> #<<<<!!!!!<<< writing to the file on the client
>                 ErrorCount == 0
>             else:
>                 ErrorCount = ErrorCount +1
>                 Pkt_Num = OldPkt_Num
> 
>             print "Requesting Packet: ", Pkt_Num +1
>             packet = self.client.download(EncodeAES(CIPHER,
> str(Pkt_Num)))
>             packet = stringToTuple(DecodeAES(CIPHER, packet))
>             Pkt_Num = int(packet[0])
>             if int(packet[0]) == -3:
>                 print "Received Error Packet"
>             elif int(packet[0]) == -2:
>                 print "Received EOF"
>             else:
>                 print "Received Packet: ", int(packet[0])
> 
>         localFile.close()
> 
>         if Pkt_Num == -2:
>             print packet[1][2:-1]
>             return True
>         elif Pkt_Num == -3:
>             os.remove("files/"+FileName)
>             print packet[1][2:-1]
>             return False
>         else:
>             os.remove("files/"+FileName)
>             print "Unexpected Packet: File Transfer Stopped"
>             return False
> 
> 
> ==========Server Method=============
>     def download(self, Pkt_Num):
> 
>         Old_Pkt_Num = self.PKT
>         DataRate = self.DATA
>         Pkt_Num = int(DecodeAES(CIPHER,Pkt_Num))
>         if Pkt_Num == -1 and Old_Pkt_Num == -1:
>             Pkt_Num = 0
>             try:
>                 f = open("files/"+self.usr_dict[client][FILENAME],
> "rb")
>             except IOError:
>                 return EncodeAES(CIPHER,
>                                  str((-3, "File Could Not be
> opened")))
>              data = binascii.b2a_base64(f.read((Pkt_Num+1 *
> DataRate)))     #<<<<<<!!!!!!!<<<<<<<< reading from file

I don't understand what you're trying to do when you're reading from
the file. For a start:

     Pkt_Num+1 * DataRate

is the same as:

     Pkt_Num + (1 * DataRate)

or:

     Pkt_Num + DataRate

and that's how many bytes you're reading.

>             f.close()
>             self.usr_dict[client][PKT] = Pkt_Num
>             return EncodeAES(CIPHER,
>                              str((Pkt_Num, data)))
> 
>         elif Pkt_Num == Old_Pkt_Num:
>             if Pkt_Num * DataRate >=
> os.path.getsize("files/"+self.usr_dict[client][FILENAME]):
>                 return EncodeAES(CIPHER,
>                              str((-2, "File Transfer Complete")))
>             try:
>                 f = open("files/"+self.usr_dict[client][FILENAME],
> "rb")
>             except IOError:
>                return EncodeAES(CIPHER,
>                              str((-3, "File Could Not be opened")))
>             data = f.read((Pkt_Num+1 * DataRate))

Here you're reading:

     Pkt_Num + DataRate

bytes again,

>             data = None

discarding what you've just read,

>             data = binascii.b2a_base64(f.read(DataRate))
> #<<<<<<<<!!!!!!!<<<<<<< reading from file

and then reading:

     DataRate

more bytes.

I think what you meant to do is .seek to the position in the file and
then read some bytes:

     f.seek(Pkt_Num * DataRate)
     data = f.read(DataRate)

ie, send the contents of the file in chunks which are DataRate bytes
long (the last chunk will be shorter if the file size isn't a multiple
of DataRate bytes).

>             f.close()
>             self.usr_dict[client][PKT] = Pkt_Num +1
> 
>             return EncodeAES(CIPHER,
>                             str((Pkt_Num+1, data)))
> 
>       else:
> 
>             return EncodeAES(CIPHER,
>                              str((-3, "Incorrect Packet Requested")))
> 
> 
> 
> Thank you all for the help,  I know there are better ways and transfer
> protocol modules to but I'd like to do this without them.
> 
I'm not surprised that the transfer is failing! :-)


From googler.1.webmaster at spamgourmet.com  Mon Mar 15 23:15:37 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Mon, 15 Mar 2010 20:15:37 -0700 (PDT)
Subject: Build Python with XCode
Message-ID: <ad4dd1ba-8f4f-4bdf-9860-56c9c899889d@t41g2000yqt.googlegroups.com>

Hi,

I would like to build Python with Xcode (but without the makefile).
Does anyone know a link where I can get a real xcodeproj with the
current Py2.x sources?


Thanks in advance!! Bye, donnerCobra


From gagsl-py2 at yahoo.com.ar  Mon Mar 15 23:52:43 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 16 Mar 2010 00:52:43 -0300
Subject: converting datetime with tzinfo to unix timestamp
References: <4B9ACB2B.3090203@gmail.com>
Message-ID: <op.u9m6d5avx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 12 Mar 2010 20:15:55 -0300, Michael Torrie <torriem at gmail.com>  
escribi?:

> On Python 2.5 here.
>
> I've searched and searched but I can't find any way to convert a
> datetime object that includes a timezone (tzinfo) to a unix timestamp.
> Folks on the net say to simply use the timetuple() method of the object
> and feed that to time.mktime().  But that just doesn't seem to work for
> me.  At least if my understanding that the unix timestamp is always UTC.

Try time.mktime(datetimeobject.utctimetuple()) instead.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Tue Mar 16 01:50:29 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 16 Mar 2010 02:50:29 -0300
Subject: result of os.times() is different with 'time' command Options
References: <16861cbc-4460-4d67-ab46-ff03517173d4@g8g2000pri.googlegroups.com>
	<fc5rp5th2qkdadi43h1hsjoimh4e88nvp4@4ax.com>
	<61c563ad-f0c3-47ae-b689-36c397f88295@l11g2000pro.googlegroups.com>
Message-ID: <op.u9nbufzvx6zn5v@lepton.softlabbsas.com.ar>

En Mon, 15 Mar 2010 03:51:28 -0300, hiral <hiralsmaillist at gmail.com>  
escribi?:
> On Mar 15, 7:14 am, Tim Roberts <t... at probo.com> wrote:
>> hiral<hiralsmaill... at gmail.com> wrote:

>> >Output:
>> >real    0.0m0.0100000002421s
>> >user    0.0m0.0s
>> >sys     0.0m0.0s
>>
>> >Command:
>> >$ time ls
>>
>> >Output:
>> >real    0m0.007s
>> >user    0m0.000s
>> >sys     0m0.000s
>>
>> You can't really do an analysis like this with a task that only takes a  
>> few
>> milliseconds.  There are too many variables.
>
> Thanks for your explanation.

Have you tested with the highly recursive function in that 2007 thread you  
linked to?
This should take time enough to make a problem like this clearly visible.

-- 
Gabriel Genellina



From joshua.r.english at gmail.com  Tue Mar 16 02:01:07 2010
From: joshua.r.english at gmail.com (Josh English)
Date: Mon, 15 Mar 2010 23:01:07 -0700 (PDT)
Subject: Dynamic Class Creation
Message-ID: <b05e819c-a005-49d4-b0e7-78be9a56b268@q2g2000pre.googlegroups.com>

I have a large program with lots of data stored in XML. I'm upgrading
my GUI to use ObjectListView, but with my data in XML, I don't have
regular objects to interact with the OLV. I do have an XML validator
that defines the structure of the XML elements, and I'm trying to
dynamically create a class to wrap the XML element.

So, an element like:

<market code="WotF">
<title>Writers of the Future</title>
</market>

I want to create a class like:

class Market(object):
    def __init__(self, elem):
        self._elem = elem

    def get_code(self):
        return self._elem.get('code')

    def set_code(self, value):
        self._elem.set('code', value)

    def get_title(self):
        return self._elem.find('title').text

    def set_title(self, value):
        node = self._elem.find('title')
        node.text = value

Naturally, I don't want to hand code this for every interface but
would like to create them dynamically. (The laziness of programming, I
guess.)

I have tried several solutions that I found on various forums, but
they are all several years old.

Questions:

What's the best way to create these helper methods?

How can I attach them to the class and have it run?

I have had a few solutions work where I had a class with three methods
(get_code, get_tier, get_mail) but they all return the same value, not
the individual values.

----
Josh English






From gagsl-py2 at yahoo.com.ar  Tue Mar 16 02:16:54 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 16 Mar 2010 03:16:54 -0300
Subject: Reverse engineering CRC?
References: <7vj7fdFnnjU1@mid.individual.net> <kz88du.hk0@spenarnc.xs4all.nl>
	<4B9E0C1F.9020003@canterbury.ac.nz>
Message-ID: <op.u9nc2glox6zn5v@lepton.softlabbsas.com.ar>

En Mon, 15 Mar 2010 07:29:51 -0300, Gregory Ewing  
<greg.ewing at canterbury.ac.nz> escribi?:

> I've solved the problem now.
>
> It turned out to be a very standard CRC algorithm, complicated
> by the presence of a few extra bytes of data being checked that
> didn't appear explicitly in the file anywhere.
>
> In the process I developed some very general techniques for
> solving this kind of problem, which I've written about here
> if anyone's interested:
>
> http://www.cosc.canterbury.ac.nz/greg.ewing/essays/CRC-Reverse-Engineering.html

A good solution to an interesting problem - and very nicely explained too!

-- 
Gabriel Genellina



From clp2 at rebertia.com  Tue Mar 16 02:18:54 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 15 Mar 2010 23:18:54 -0700
Subject: Dynamic Class Creation
In-Reply-To: <b05e819c-a005-49d4-b0e7-78be9a56b268@q2g2000pre.googlegroups.com>
References: <b05e819c-a005-49d4-b0e7-78be9a56b268@q2g2000pre.googlegroups.com>
Message-ID: <50697b2c1003152318t7b9cd692pcf11ca45bbe1f041@mail.gmail.com>

On Mon, Mar 15, 2010 at 11:01 PM, Josh English
<joshua.r.english at gmail.com> wrote:
> I have a large program with lots of data stored in XML. I'm upgrading
> my GUI to use ObjectListView, but with my data in XML, I don't have
> regular objects to interact with the OLV. I do have an XML validator
> that defines the structure of the XML elements, and I'm trying to
> dynamically create a class to wrap the XML element.
>
> So, an element like:
>
> <market code="WotF">
> <title>Writers of the Future</title>
> </market>
>
> I want to create a class like:
>
> class Market(object):
> ? ?def __init__(self, elem):
> ? ? ? ?self._elem = elem
>
> ? ?def get_code(self):
> ? ? ? ?return self._elem.get('code')
>
> ? ?def set_code(self, value):
> ? ? ? ?self._elem.set('code', value)
>
> ? ?def get_title(self):
> ? ? ? ?return self._elem.find('title').text
>
> ? ?def set_title(self, value):
> ? ? ? ?node = self._elem.find('title')
> ? ? ? ?node.text = value
>
> Naturally, I don't want to hand code this for every interface but
> would like to create them dynamically. (The laziness of programming, I
> guess.)
>
> I have tried several solutions that I found on various forums, but
> they are all several years old.
>
> Questions:
>
> What's the best way to create these helper methods?

Nested functions:

def make_attr_getset(name):
    def get(self):
        return self._elem.get(name)

    def set(self, value):
        self._elem.set(name, value)
    return get, set

get_code, set_code = make_attr_getset('code')

def make_subelement_getset(name):
    def get(self):
        return self._elem.find(name).text

    def set(self, value):
        node = self._elem.find(name)
        node.text = value
    return get, set

get_title, set_title = make_subelement_getset('title')

> How can I attach them to the class and have it run?

Use properties and setattr():

class Market(object):
    def __init__(... #same as before

setattr(Market, 'code', property(get_code, set_code))
setattr(Market, 'title', property(get_title, set_title))

m = Market(the_XML)
print m.title #=> Writers of the Future
m.title = "Writers of the Past"
print m.code #=> WotF
m.code = "WofP"

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


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From: satyamrajuhyd at gmail.com (Earn money)
Date: Mon, 15 Mar 2010 23:44:17 -0700 (PDT)
Subject: Data entry Work available
Message-ID: <cfa11b0e-15c9-4be7-9448-25ba73abf387@p3g2000pra.googlegroups.com>

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From gagsl-py2 at yahoo.com.ar  Tue Mar 16 02:46:05 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 16 Mar 2010 03:46:05 -0300
Subject: time_struct
References: <23dbe409-60ed-4f6f-bd38-4336e4f1b3d0@f8g2000yqn.googlegroups.com>
Message-ID: <op.u9nee3alx6zn5v@lepton.softlabbsas.com.ar>

En Sun, 07 Mar 2010 10:50:59 -0300, moerchendiser2k3  
<googler.1.webmaster at spamgourmet.com> escribi?:

> can anyone tell me how to return a time_struct from the timemodule in
> my own C-Module?
> Is that possible? I can just find one function in timefuncs.h, but it
> doesnt return any PyObject.

The type is available as the struct_time attribute in the time module; you  
create an instance by calling it with a 9-items sequence.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Tue Mar 16 03:04:44 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 16 Mar 2010 04:04:44 -0300
Subject: xml-rpc
References: <4B9C9AF9.80609@gmail.com>
Message-ID: <op.u9ne96gqx6zn5v@lepton.softlabbsas.com.ar>

En Sun, 14 Mar 2010 05:14:49 -0300, ahmet erdinc yilmaz  
<ahmeterdinc09 at gmail.com> escribi?:

> Recenetly we are developing a senior project and decide to use xmlrpclib.
> However I have some questions. In the documentation I could not find any  
> clue about
> handling requests? Does the server handles each request in a separate  
> thread? Or is
> there some queuing mechanism for client calls? Thanks in advance.

xmlrpclib is a *client* library.
Python also provides an XMLRPC *server* in the SimpleXMLRPCServer module.  
It inherits from SocketServer.TCPServer. The default behavior is to  
process one request at a time, in a single process. You may alter such  
behavior by additionally inheriting from ForkingMixIn or ThreadingMixIn.

-- 
Gabriel Genellina



From no.email at nospam.invalid  Tue Mar 16 03:39:55 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Tue, 16 Mar 2010 00:39:55 -0700
Subject: affectation in if statement
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
Message-ID: <7x8w9s4svo.fsf@ruckus.brouhaha.com>

samb <sam.bancal at gmail.com> writes:
> or like :
>
> m = re.match(r'define\s+(\S+)\s*{$', line)
> if m:
>     thing = m.group(1)
> else:
>     m = re.match(r'include\s+(\S+)$', line)
>     if m:
>         thing = m.group(1)
>     else
>         thing = ""
>
> Which isn't nice neither because I'm going to have maybe 20 match
> tests and I wouldn't like to have 20 indentations.

for pat in [r'define\s+(\S+)\s*{$', r'include\s+(\S+)$', ...]:
   m = re.match(pat, line)
   ...


From ldo at geek-central.gen.new_zealand  Tue Mar 16 03:40:36 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 16 Mar 2010 20:40:36 +1300
Subject: import antigravity
Message-ID: <hnnclk$eud$1@lust.ihug.co.nz>

Subtle...


From sam.bancal at gmail.com  Tue Mar 16 03:45:34 2010
From: sam.bancal at gmail.com (samb)
Date: Tue, 16 Mar 2010 00:45:34 -0700 (PDT)
Subject: affectation in if statement
Message-ID: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>

Hi,

I'm trying to do something like :

if m = re.match(r'define\s+(\S+)\s*{$', line):
    thing = m.group(1)
elif m = re.match(r'include\s+(\S+)$', line):
    thing = m.group(1)
else
    thing = ""

But in fact I'm not allowed to affect a variable in "if" statement.
My code should then look like :

if re.match(r'define\s+(\S+)\s*{$', line):
    m = re.match(r'define\s+(\S+)\s*{$', line)
    thing = m.group(1)
elif re.match(r'include\s+(\S+)$', line):
    m = re.match(r'include\s+(\S+)$', line)
    thing = m.group(1)
else
    thing = ""

Which is not nice because I'm doing twice the same instruction
or like :

m = re.match(r'define\s+(\S+)\s*{$', line)
if m:
    thing = m.group(1)
else:
    m = re.match(r'include\s+(\S+)$', line)
    if m:
        thing = m.group(1)
    else
        thing = ""

Which isn't nice neither because I'm going to have maybe 20 match
tests and I wouldn't like to have 20 indentations.

Anyone a recommendation?

Thanks!


From steven at REMOVE.THIS.cybersource.com.au  Tue Mar 16 03:47:45 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 16 Mar 2010 07:47:45 GMT
Subject: subtraction is giving me a syntax error
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
	<mailman.800.1268675343.23598.python-list@python.org>
	<hnlt4p$4j1$1@reader1.panix.com>
	<4b9eb5bd$0$27822$c3e8da3@news.astraweb.com>
	<hnmduj$gnp$1@reader1.panix.com>
Message-ID: <pan.2010.03.16.07.47.45@REMOVE.THIS.cybersource.com.au>

On Mon, 15 Mar 2010 22:56:19 +0000, Grant Edwards wrote:

> On 2010-03-15, Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au>
> wrote:
>> On Mon, 15 Mar 2010 18:09:29 +0000, Grant Edwards wrote:
>>
>>>> Delete the character between "y_diff" and "H" and replace it with a
>>>> plain ASCII subtraction sign.
>>> 
>>> I think somebody needs to stop editing his code with MS Word and start
>>> using a programming editor. ;)
>>
>> I've had this error myself, and I've never used Word to edit code. It
>> can happen if you copy code from a website that "helpfully" converts
>> hyphens to en-dashes, spaces to non-breaking spaces, or inserts ctrl-Z
>> characters into strings, etc. They're a devil to debug.
> 
> Though it may not be Microsoft Word, I think I'd still maintain that an
> editor where you can't see a ctrl-Z or tell the difference between an
> ASCII minus and a windows-codepage-whatever isn't a very good
> programmer's editor.

Regarding ctrl-Z (or for that matter other control characters), I agree 
it's a lack.

As for not being able to see the difference between a hyphen and an EN-
dash, or minus sign, or whatever it is, yes but they are very similar 
looking glyphs in virtually ever modern font. It would take a good eye to 
see the difference between (say) ? ? and -.


-- 
Steven


From stefan_ml at behnel.de  Tue Mar 16 03:50:30 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 16 Mar 2010 08:50:30 +0100
Subject: extract occurrence of regular expression from elements of XML
	documents
In-Reply-To: <5444f9711003151016m39af59efg3ed38d2ac90f93c1@mail.gmail.com>
References: <5444f9711003151016m39af59efg3ed38d2ac90f93c1@mail.gmail.com>
Message-ID: <hnnd87$2oe$1@dough.gmane.org>

Martin Schmidt, 15.03.2010 18:16:
> I have just started to use Python a few weeks ago and until last week I had
> no knowledge of XML.
> Obviously my programming knowledge is pretty basic.
> Now I would like to use Python in combination with ca. 2000 XML documents
> (about 30 kb each) to search for certain regular expression within specific
> elements of these documents.

2000 * 30K isn't a huge problem, that's just 60M in total. If you just have 
to do it once, drop your performance concerns and just get a solution 
going. If you have to do it once a day, take care to use a tool that is not 
too resource consuming. If you have strict requirements to do it once a 
minute, use a fast machine with a couple of cores and do it in parallel. If 
you have a huge request workload and want to reverse index the XML to do 
all sorts of sophisticated queries on it, use a database instead.


> I would then like to record the number of occurrences of the regular
> expression within these elements.
> Moreover I would like to count the total number of words contained within
> these,

len(text.split()) will give you those.

BTW, is it document-style XML (with mixed content as in HTML) or is the 
text always withing a leaf element?


> and record the attribute of a higher level element that contains
> them.

An example would certainly help here.


> I was trying to figure out the best way how to do this, but got overwhelmed
> by the available information (e.g. posts using different approaches based on
> dom, sax, xpath, elementtree, expat).
> The outcome should be a file that lists the extracted attribute, the number
> of occurrences of the regular expression, and the total number of words.
> I did not find a post that addresses my problem.

Funny that you say that after stating that you were overwhelmed by the 
available information.


> If someone could help me with this I would really appreciate it.

Most likely, the solution with the best simplicity/performance trade-off 
would be xml.etree.cElementTree's iterparse(), intercept on each 
interesting tag name, and search its text/tail using the regexp. That's 
doable in a couple of lines.

But unless you provide more information, it's hard to give better advice.

Stefan



From stefan_ml at behnel.de  Tue Mar 16 03:51:58 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 16 Mar 2010 08:51:58 +0100
Subject: import antigravity
In-Reply-To: <hnnclk$eud$1@lust.ihug.co.nz>
References: <hnnclk$eud$1@lust.ihug.co.nz>
Message-ID: <hnndau$2oe$2@dough.gmane.org>

Lawrence D'Oliveiro, 16.03.2010 08:40:
> Subtle...

Absolutely.

   Python 2.4.6 (#2, Jan 21 2010, 23:45:25)
   [GCC 4.4.1] on linux2
   Type "help", "copyright", "credits" or "license" for more information.
   >>> import antigravity
   Traceback (most recent call last):
     File "<stdin>", line 1, in ?
   ImportError: No module named antigravity


Stefan



From clp2 at rebertia.com  Tue Mar 16 03:52:07 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 16 Mar 2010 00:52:07 -0700
Subject: import antigravity
In-Reply-To: <hnnclk$eud$1@lust.ihug.co.nz>
References: <hnnclk$eud$1@lust.ihug.co.nz>
Message-ID: <50697b2c1003160052m6358b020g6a65910c8d7af981@mail.gmail.com>

On Tue, Mar 16, 2010 at 12:40 AM, Lawrence D'Oliveiro
<ldo at geek-central.gen.new_zealand> wrote:
> Subtle...

You're a bit behind the times.
If my calculations are right, that comic is over 2 years old.

Cheers,
Chris


From clp2 at rebertia.com  Tue Mar 16 03:58:23 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 16 Mar 2010 00:58:23 -0700
Subject: affectation in if statement
In-Reply-To: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
Message-ID: <50697b2c1003160058t6ec2627ap42cfc7976f1bd2e4@mail.gmail.com>

On Tue, Mar 16, 2010 at 12:45 AM, samb <sam.bancal at gmail.com> wrote:
> Hi,
>
> I'm trying to do something like :
>
> if m = re.match(r'define\s+(\S+)\s*{$', line):
> ? ?thing = m.group(1)
> elif m = re.match(r'include\s+(\S+)$', line):
> ? ?thing = m.group(1)
> else
> ? ?thing = ""
>
> But in fact I'm not allowed to affect a variable in "if" statement.
> My code should then look like :
>
> if re.match(r'define\s+(\S+)\s*{$', line):
> ? ?m = re.match(r'define\s+(\S+)\s*{$', line)
> ? ?thing = m.group(1)
> elif re.match(r'include\s+(\S+)$', line):
> ? ?m = re.match(r'include\s+(\S+)$', line)
> ? ?thing = m.group(1)
> else
> ? ?thing = ""
>
> Which is not nice because I'm doing twice the same instruction
> or like :
>
> m = re.match(r'define\s+(\S+)\s*{$', line)
> if m:
> ? ?thing = m.group(1)
> else:
> ? ?m = re.match(r'include\s+(\S+)$', line)
> ? ?if m:
> ? ? ? ?thing = m.group(1)
> ? ?else
> ? ? ? ?thing = ""
>
> Which isn't nice neither because I'm going to have maybe 20 match
> tests and I wouldn't like to have 20 indentations.
>
> Anyone a recommendation?

def extract_thing(line):
    for regex in (r'define\s+(\S+)\s*{$', r'include\s+(\S+)$'):
        m = re.match(regex, line)
        if m: return m.group(1)
    return ""

Or if the real code is more complicated than your example:

def extract_thing(line):
    m = re.match(r'define\s+(\S+)\s*{$', line)
    if m: return m.group(1)

    m = re.match(r'include\s+(\S+)$', line)
    if m: return m.group(1)

    #etc...

    return ""

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


From gherron at islandtraining.com  Tue Mar 16 04:10:39 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Tue, 16 Mar 2010 01:10:39 -0700
Subject: affectation in if statement
In-Reply-To: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
Message-ID: <4B9F3CFF.8040209@islandtraining.com>

samb wrote:
> Hi,
>
> I'm trying to do something like :
>
> if m = re.match(r'define\s+(\S+)\s*{$', line):
>     thing = m.group(1)
> elif m = re.match(r'include\s+(\S+)$', line):
>     thing = m.group(1)
> else
>     thing = ""
>
> But in fact I'm not allowed to affect a variable in "if" statement.
> My code should then look like :
>
> if re.match(r'define\s+(\S+)\s*{$', line):
>     m = re.match(r'define\s+(\S+)\s*{$', line)
>     thing = m.group(1)
> elif re.match(r'include\s+(\S+)$', line):
>     m = re.match(r'include\s+(\S+)$', line)
>     thing = m.group(1)
> else
>     thing = ""
>
> Which is not nice because I'm doing twice the same instruction
> or like :
>
> m = re.match(r'define\s+(\S+)\s*{$', line)
> if m:
>     thing = m.group(1)
> else:
>     m = re.match(r'include\s+(\S+)$', line)
>     if m:
>         thing = m.group(1)
>     else
>         thing = ""
>
> Which isn't nice neither because I'm going to have maybe 20 match
> tests and I wouldn't like to have 20 indentations.
>
> Anyone a recommendation?
>   

Yes:  Use an array of regular expressions and a loop (untested):

exprs = ["...",
              "...",
              ]

thing = ""
for expr in exps:
      m = re.match(expr, line)
      if m:
         thing = m.group(1)
         break

> Thanks!
>   

Gary Herron



From clp2 at rebertia.com  Tue Mar 16 04:16:02 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 16 Mar 2010 01:16:02 -0700
Subject: import antigravity
In-Reply-To: <hnndau$2oe$2@dough.gmane.org>
References: <hnnclk$eud$1@lust.ihug.co.nz> <hnndau$2oe$2@dough.gmane.org>
Message-ID: <50697b2c1003160116p20e2e59v42996dd60241b47f@mail.gmail.com>

On Tue, Mar 16, 2010 at 12:51 AM, Stefan Behnel <stefan_ml at behnel.de> wrote:
> Lawrence D'Oliveiro, 16.03.2010 08:40:
>>
>> Subtle...
>
> Absolutely.
>
> ?Python 2.4.6 (#2, Jan 21 2010, 23:45:25)
> ?[GCC 4.4.1] on linux2
> ?Type "help", "copyright", "credits" or "license" for more information.
> ?>>> import antigravity
> ?Traceback (most recent call last):
> ? ?File "<stdin>", line 1, in ?
> ?ImportError: No module named antigravity

http://svn.python.org/view/python/trunk/Lib/antigravity.py?view=markup&pathrev=66902

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


From sam.bancal at gmail.com  Tue Mar 16 04:37:13 2010
From: sam.bancal at gmail.com (samb)
Date: Tue, 16 Mar 2010 01:37:13 -0700 (PDT)
Subject: affectation in if statement
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
	<mailman.823.1268727047.23598.python-list@python.org>
Message-ID: <5c361012-1f7b-487f-915b-0f564b238be3@e1g2000yqh.googlegroups.com>

Thanks for all those suggestions.
They are good!

1) Let's suppose now that instead of just affecting "thing =
m.group(1)", I need to do a piece of logic depending on which match I
entered...

2) Concerning the suggestion :
m = re.match(r'define\s+(\S+)\s*{$', line)
if m:
    thing = m.group(1)

m = re.match(r'include\s+(\S+)$', line)
if m:
    thing = m.group(1)

#etc...

It means that I'll do all the checks, even if the first one did match
and I know that the next will not...

Thanks again.


From rtw at rtw.me.uk  Tue Mar 16 04:52:45 2010
From: rtw at rtw.me.uk (Rob Williscroft)
Date: Tue, 16 Mar 2010 03:52:45 -0500
Subject: affectation in if statement
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
	<mailman.823.1268727047.23598.python-list@python.org>
	<5c361012-1f7b-487f-915b-0f564b238be3@e1g2000yqh.googlegroups.com>
Message-ID: <Xns9D3D5AC2F9726rtwfreenetREMOVEcouk@216.196.109.145>

samb wrote in news:5c361012-1f7b-487f-915b-0f564b238be3
@e1g2000yqh.googlegroups.com in comp.lang.python:

> Thanks for all those suggestions.
> They are good!
> 
> 1) Let's suppose now that instead of just affecting "thing =
> m.group(1)", I need to do a piece of logic depending on which match I
> entered...
> 
> 2) Concerning the suggestion :
> m = re.match(r'define\s+(\S+)\s*{$', line)
> if m:
>     thing = m.group(1)
> 
> m = re.match(r'include\s+(\S+)$', line)
> if m:
>     thing = m.group(1)
> 
> #etc...
> 
> It means that I'll do all the checks, even if the first one did match
> and I know that the next will not...
> 

Ths is how I did it when I had the need:

class ReMatch( object ):
  def __call__( self, pat, string ):
    import re
    self.match = re.match( pat, string )
    return self.match is not None

clip = ...

re = ReMatch()

if re( r'\s*TM(\d+)', clip ):
  ...    	
elif re( r'\s*(https?://.*)', clip ):
   ...
elif re( r'\d{12}$', clip ):
  ...

Rob.
-- 


From clp2 at rebertia.com  Tue Mar 16 04:53:33 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 16 Mar 2010 01:53:33 -0700
Subject: affectation in if statement
In-Reply-To: <5c361012-1f7b-487f-915b-0f564b238be3@e1g2000yqh.googlegroups.com>
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
	<mailman.823.1268727047.23598.python-list@python.org>
	<5c361012-1f7b-487f-915b-0f564b238be3@e1g2000yqh.googlegroups.com>
Message-ID: <50697b2c1003160153o5ca357eci986d40cadd05a06c@mail.gmail.com>

On Tue, Mar 16, 2010 at 1:37 AM, samb <sam.bancal at gmail.com> wrote:
> Thanks for all those suggestions.
> They are good!
<snip>
> 2) Concerning the suggestion :
> m = re.match(r'define\s+(\S+)\s*{$', line)
> if m:
> ? ?thing = m.group(1)
>
> m = re.match(r'include\s+(\S+)$', line)
> if m:
> ? ?thing = m.group(1)
>
> #etc...
>
> It means that I'll do all the checks, even if the first one did match
> and I know that the next will not...

Note how I split it out into a separate function and used `return
m.group(1)` to avoid that exact situation.

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


From bruno.42.desthuilliers at websiteburo.invalid  Tue Mar 16 05:04:10 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 16 Mar 2010 10:04:10 +0100
Subject: to pass self or not to pass self
In-Reply-To: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
Message-ID: <4b9f4984$0$10229$426a74cc@news.free.fr>

lallous a ?crit :
> Hello,
> 
> Learning Python from the help file and online resources can leave one
> with many gaps. Can someone comment on the following:

(snip code)

> Why in test1() when it uses the class variable func_tbl we still need
> to pass self, but in test2() we don't ?
> 
> What is the difference between the reference in 'F' and 'func_tbl' ?

Answer here:

http://wiki.python.org/moin/FromFunctionToMethod



From sam.bancal at gmail.com  Tue Mar 16 05:53:51 2010
From: sam.bancal at gmail.com (samb)
Date: Tue, 16 Mar 2010 02:53:51 -0700 (PDT)
Subject: affectation in if statement
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
	<mailman.823.1268727047.23598.python-list@python.org>
	<5c361012-1f7b-487f-915b-0f564b238be3@e1g2000yqh.googlegroups.com>
	<mailman.825.1268729621.23598.python-list@python.org>
Message-ID: <8680128a-70a8-4dae-869b-108203be781c@y17g2000yqd.googlegroups.com>

On Mar 16, 9:53?am, Chris Rebert <c... at rebertia.com> wrote:
> On Tue, Mar 16, 2010 at 1:37 AM, samb <sam.ban... at gmail.com> wrote:
> > Thanks for all those suggestions.
> > They are good!
> <snip>
> > 2) Concerning the suggestion :
> > m = re.match(r'define\s+(\S+)\s*{$', line)
> > if m:
> > ? ?thing = m.group(1)
>
> > m = re.match(r'include\s+(\S+)$', line)
> > if m:
> > ? ?thing = m.group(1)
>
> > #etc...
>
> Note how I split it out into a separate function and used `return
> m.group(1)` to avoid that exact situation.

Yes, you're right.
It's an interresting approach. I'll give it a try.

Cheers


From sam.bancal at gmail.com  Tue Mar 16 06:21:45 2010
From: sam.bancal at gmail.com (samb)
Date: Tue, 16 Mar 2010 03:21:45 -0700 (PDT)
Subject: affectation in if statement
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
	<mailman.823.1268727047.23598.python-list@python.org>
	<5c361012-1f7b-487f-915b-0f564b238be3@e1g2000yqh.googlegroups.com>
	<mailman.825.1268729621.23598.python-list@python.org>
	<8680128a-70a8-4dae-869b-108203be781c@y17g2000yqd.googlegroups.com>
Message-ID: <ce7d69e9-c62b-44ae-b12b-922bb27bf458@c16g2000yqd.googlegroups.com>

Hi,

I've found a work around, inspired from Rob Williscroft :

class ReMatch(object):
    """
        Object to be called :
        1st time : do a regexp.match and return the answer (args:
regexp, line)
        2nd time : return the previous result (args: prev)
    """
    def __call__(self, regexp='', line='', prev=False):
        if prev:
            return self.prev_match
        self.prev_match = re.match(regexp, line)
        return self.prev_match

re_match = ReMatch()

if re_match(r'define\s+(\S+)\s*{$', line):
    m = re_match(prev=True)
    # do some logic with m
elif re_match(r'include\s+(\S+)$', line):
    m = re_match(prev=True)
    # do some logic with m
else
    # do some logic

Hope this is efficient ... I guess yes.

Cheers,
Sam


From __peter__ at web.de  Tue Mar 16 06:45:40 2010
From: __peter__ at web.de (Peter Otten)
Date: Tue, 16 Mar 2010 11:45:40 +0100
Subject: affectation in if statement
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
	<mailman.823.1268727047.23598.python-list@python.org>
	<5c361012-1f7b-487f-915b-0f564b238be3@e1g2000yqh.googlegroups.com>
	<mailman.825.1268729621.23598.python-list@python.org>
	<8680128a-70a8-4dae-869b-108203be781c@y17g2000yqd.googlegroups.com>
	<ce7d69e9-c62b-44ae-b12b-922bb27bf458@c16g2000yqd.googlegroups.com>
Message-ID: <hnnng1$laf$02$1@news.t-online.com>

samb wrote:

> I've found a work around, inspired from Rob Williscroft :
> 
> class ReMatch(object):
>     """
>         Object to be called :
>         1st time : do a regexp.match and return the answer (args:
> regexp, line)
>         2nd time : return the previous result (args: prev)
>     """
>     def __call__(self, regexp='', line='', prev=False):
>         if prev:
>             return self.prev_match
>         self.prev_match = re.match(regexp, line)
>         return self.prev_match
> 
> re_match = ReMatch()
> 
> if re_match(r'define\s+(\S+)\s*{$', line):
>     m = re_match(prev=True)
>     # do some logic with m
> elif re_match(r'include\s+(\S+)$', line):
>     m = re_match(prev=True)
>     # do some logic with m
> else
>     # do some logic
> 
> Hope this is efficient ... I guess yes.

No; just accessing the prev_match attribute instead of passing a flag to the 
__call__() method is more efficient and easier to read. I think the latter 
is the relevant point...

Peter


From bruno.42.desthuilliers at websiteburo.invalid  Tue Mar 16 06:53:22 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 16 Mar 2010 11:53:22 +0100
Subject: affectation in if statement
In-Reply-To: <ce7d69e9-c62b-44ae-b12b-922bb27bf458@c16g2000yqd.googlegroups.com>
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
	<mailman.823.1268727047.23598.python-list@python.org>
	<5c361012-1f7b-487f-915b-0f564b238be3@e1g2000yqh.googlegroups.com>
	<mailman.825.1268729621.23598.python-list@python.org>
	<8680128a-70a8-4dae-869b-108203be781c@y17g2000yqd.googlegroups.com>
	<ce7d69e9-c62b-44ae-b12b-922bb27bf458@c16g2000yqd.googlegroups.com>
Message-ID: <4b9f631c$0$3618$426a74cc@news.free.fr>

samb a ?crit :
> Hi,
> 
> I've found a work around, inspired from Rob Williscroft :
> 
> class ReMatch(object):
>     """
>         Object to be called :
>         1st time : do a regexp.match and return the answer (args:
> regexp, line)
>         2nd time : return the previous result (args: prev)
>     """
>     def __call__(self, regexp='', line='', prev=False):
>         if prev:
>             return self.prev_match
>         self.prev_match = re.match(regexp, line)
>         return self.prev_match
> 
> re_match = ReMatch()
> 
> if re_match(r'define\s+(\S+)\s*{$', line):
>     m = re_match(prev=True)
>     # do some logic with m
> elif re_match(r'include\s+(\S+)$', line):
>     m = re_match(prev=True)
>     # do some logic with m
> else
>     # do some logic
> 
> Hope this is efficient ... I guess yes.

A direct attribute access is cheaper than a method call, and makes for a 
simpler API too:

class ReMatch(object):
      match = None

      def __call__(self, regexp, source):
          self.match = re.match(regexp, source)
          return self.match


re_match = ReMatch()

if re_match(r'define\s+(\S+)\s*{$', line):
      m = re_match.match
      # do some logic with m
elif re_match(r'include\s+(\S+)$', line):
       m = re_match.match
      # do some logic with m

My 2 cents...


From mail at hellmutweber.de  Tue Mar 16 06:54:49 2010
From: mail at hellmutweber.de (Hellmut Weber)
Date: Tue, 16 Mar 2010 11:54:49 +0100
Subject: A tool for find dependencies relationships behind Python projects
In-Reply-To: <f2c32233-ab42-40b4-87ec-89130eb18d86@c37g2000prb.googlegroups.com>
References: <e6cb616e-907c-4029-80cc-5f68a140e5ad@e19g2000prn.googlegroups.com>	<mailman.61.1266856327.4577.python-list@python.org>
	<f2c32233-ab42-40b4-87ec-89130eb18d86@c37g2000prb.googlegroups.com>
Message-ID: <4B9F6379.5040805@hellmutweber.de>

Am 24.02.2010 18:49, schrieb Victor Lin:
> On 2?23?, ??12?32?, Hellmut Weber<m... at hellmutweber.de>  wrote:
>> Hi Victor,
>> I would be intereseted to use your tool ;-)
>>
>> My system is Sabayon-5.1 on Lenovo T61.
>> Trying for the first time easy_install I get the following error:
>>
>> ====================
>>
>> root at sylvester ~ # easy_install gluttony
>> Searching for gluttony
>> Readinghttp://pypi.python.org/simple/gluttony/
>> Readinghttp://code.google.com/p/python-gluttony/
>> Best match: Gluttony 0.3
>>
>> Downloadinghttp://pypi.python.org/packages/source/G/Gluttony/Gluttony-0.3.zip#md...
>>
>> Processing Gluttony-0.3.zip
>> Running Gluttony-0.3/setup.py -q bdist_egg --dist-dir
>> /tmp/easy_install-uPz7qO/Gluttony-0.3/egg-dist-tmp-CJI_LD
>> Traceback (most recent call last):
>>     File "/usr/bin/easy_install", line 9, in<module>
>>       load_entry_point('distribute==0.6.8', 'console_scripts',
>> 'easy_install')()
>>     File
>> "/usr/lib64/python2.6/site-packages/setuptools/command/easy_install.py",
>> line 1708, in main
>>       with_ei_usage(lambda:
>>     File
>> "/usr/lib64/python2.6/site-packages/setuptools/command/easy_install.py",
>> line 1696, in with_ei_usage
>>       return f()
>>     File
>> "/usr/lib64/python2.6/site-packages/setuptools/command/easy_install.py",
>> line 1712, in<lambda>
>>       distclass=DistributionWithoutHelpCommands, **kw
>>     File "/usr/lib64/python2.6/distutils/core.py", line 152, in setup
>>       dist.run_commands()
>>     File "/usr/lib64/python2.6/distutils/dist.py", line 975, in run_commands
>>       self.run_command(cmd)
>>     File "/usr/lib64/python2.6/distutils/dist.py", line 995, in run_command
>>       cmd_obj.run()
>>     File
>> "/usr/lib64/python2.6/site-packages/setuptools/command/easy_install.py",
>> line 236, in run
>>       self.easy_install(spec, not self.no_deps)
>>     File
>> "/usr/lib64/python2.6/site-packages/setuptools/command/easy_install.py",
>> line 471, in easy_install
>>       return self.install_item(spec, dist.location, tmpdir, deps)
>>     File
>> "/usr/lib64/python2.6/site-packages/setuptools/command/easy_install.py",
>> line 501, in install_item
>>       dists = self.install_eggs(spec, download, tmpdir)
>>     File
>> "/usr/lib64/python2.6/site-packages/setuptools/command/easy_install.py",
>> line 680, in install_eggs
>>       return self.build_and_install(setup_script, setup_base)
>>     File
>> "/usr/lib64/python2.6/site-packages/setuptools/command/easy_install.py",
>> line 957, in build_and_install
>>       self.run_setup(setup_script, setup_base, args)
>>     File
>> "/usr/lib64/python2.6/site-packages/setuptools/command/easy_install.py",
>> line 946, in run_setup
>>       run_setup(setup_script, args)
>>     File "/usr/lib64/python2.6/site-packages/setuptools/sandbox.py", line
>> 29, in run_setup
>>       lambda: execfile(
>>     File "/usr/lib64/python2.6/site-packages/setuptools/sandbox.py", line
>> 70, in run
>>       return func()
>>     File "/usr/lib64/python2.6/site-packages/setuptools/sandbox.py", line
>> 31, in<lambda>
>>       {'__file__':setup_script, '__name__':'__main__'}
>>     File "setup.py", line 9, in<module>
>>     File "/tmp/easy_install-uPz7qO/Gluttony-0.3/gluttony/__init__.py",
>> line 1, in<module>
>>       #
>>     File "/tmp/easy_install-uPz7qO/Gluttony-0.3/gluttony/gluttony.py",
>> line 13, in<module>
>> ImportError: No module named pip.log
>> root at sylvester ~ #
>>
>> ====================
>>
>> I emerged app-misc/pip, but that didn't help, the error remains the same
>>
>> What is missing?
>>
>> Any help appreciated
>>
>> Best regards
>>
>> Hellmut
>>
>> Am 19.02.2010 17:16, schrieb Victor Lin:
>>
>>
>>
>>
>>
>>> Hi,
>>
>>> I just wrote a tool for drawing dependencies relationships diagram of
>>> Python project on Pypi.  Here is the home page of the tool:
>>
>>> http://code.google.com/p/python-gluttony/
>>
>>> Some examples:
>>> Sprox:
>>> http://static.ez2learn.com/gluttony/sprox_dot.png
>>
>>> TurboGears2:
>>> http://static.ez2learn.com/gluttony/tg2_dot.png
>>
>>> Hope this could be helpful :P
>>
>>> Regards.
>>> Victor Lin.
>>
>> --
>> Dr. Hellmut Weber         m... at hellmutweber.de
>> Degenfeldstra?e 2         tel   +49-89-3081172
>> D-80803 M?nchen-Schwabing mobil +49-172-8450321
>> please: No DOCs, no PPTs. why: tinyurl.com/cbgq
>
> Hi,
>
> That is a mistake I made in when I am making the distribute.  Thanks
> your reporting.  I have already fixed the problem and released
> Gluttony 0.4, and I tried to install that, it works fine.
>
> Victor Lin.

Hi Victor,
thanks for your message.
Sorry I'm so late to answer, I've been offline for a while and didn't 
remember not to have answered. ,-(

I downloaded Gluttony-0.4 and the installation was done in a few seconds.

It works just fine ;-)

Thanks for providing this tool

Cheers

Hellmut

-- 
Dr. Hellmut Weber         mail at hellmutweber.de
Degenfeldstra?e 2         tel   +49-89-3081172
D-80803 M?nchen-Schwabing mobil +49-172-8450321
please: No DOCs, no PPTs. why: tinyurl.com/cbgq




From jeanmichel at sequans.com  Tue Mar 16 06:56:11 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Tue, 16 Mar 2010 11:56:11 +0100
Subject: affectation in if statement
In-Reply-To: <ce7d69e9-c62b-44ae-b12b-922bb27bf458@c16g2000yqd.googlegroups.com>
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>	<mailman.823.1268727047.23598.python-list@python.org>	<5c361012-1f7b-487f-915b-0f564b238be3@e1g2000yqh.googlegroups.com>	<mailman.825.1268729621.23598.python-list@python.org>	<8680128a-70a8-4dae-869b-108203be781c@y17g2000yqd.googlegroups.com>
	<ce7d69e9-c62b-44ae-b12b-922bb27bf458@c16g2000yqd.googlegroups.com>
Message-ID: <4B9F63CB.1040708@sequans.com>

samb wrote:
> Hi,
>
> I've found a work around, inspired from Rob Williscroft :
>
> class ReMatch(object):
>     """
>         Object to be called :
>         1st time : do a regexp.match and return the answer (args:
> regexp, line)
>         2nd time : return the previous result (args: prev)
>     """
>     def __call__(self, regexp='', line='', prev=False):
>         if prev:
>             return self.prev_match
>         self.prev_match = re.match(regexp, line)
>         return self.prev_match
>
> re_match = ReMatch()
>
> if re_match(r'define\s+(\S+)\s*{$', line):
>     m = re_match(prev=True)
>     # do some logic with m
> elif re_match(r'include\s+(\S+)$', line):
>     m = re_match(prev=True)
>     # do some logic with m
> else
>     # do some logic
>
> Hope this is efficient ... I guess yes.
>
> Cheers,
> Sam
What do you mean by efficient ? If you're talking about speed, make sure 
you care about it before doing some optimization.
If you talk about readability then it is absolutely *not* efficient (to 
my humble opinion).

define, include = re.match(r'define\s+(\S+)\s*{$', line), 
re.match(r'include\s+(\S+)$', line)
if define:
    # do some stuff
elif include:
    # do some other stuff
else:
    # hello world
   

If you then have some speed problem with that script, you'll start 
caring about how to execute if faster by making sure that only necessary 
calls to re.match are done.

match = re.match(r'(define)\s+(\S+)\s*{$', line) or 
re.match(r'(include)\s+(\S+)$', line) # note that the second operand is 
executed only if the first is None

if match.group(1) == 'define':
    # do some stuff with match.group(2)

elif match.group(1) == 'include':
    # do some other stuff with match.group(2)

else:
    # hello world


JM


From hackingkk at gmail.com  Tue Mar 16 07:02:09 2010
From: hackingkk at gmail.com (hackingKK)
Date: Tue, 16 Mar 2010 16:32:09 +0530
Subject: any python libraries for rendering open office spreadsheet to html
Message-ID: <4B9F6531.5010604@gmail.com>

Hello,
Is there a python library which can render ods to html.
(I would even prefer javascript library to do this).
The reason I am more interested in a python library is because, I am 
developing a web application in pylons.
It is a financial software and initially on the desktop based client, I 
used odfpy to create spreadsheets.
But now I would want to render those sheets to the web front end.

Happy hacking.
Krishnakant.



From steve at REMOVE-THIS-cybersource.com.au  Tue Mar 16 07:46:51 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 16 Mar 2010 11:46:51 GMT
Subject: Understanding the CPython dict implementation
References: <mailman.768.1268610003.23598.python-list@python.org>
Message-ID: <4b9f6fab$0$27822$c3e8da3@news.astraweb.com>

On Sun, 14 Mar 2010 19:39:46 -0400, Terry Reedy wrote:

> I found this PyCon2010 presentation to be excellent: The Mighty
> Dictionary, Branden Craig Rhodes, 30 min.
> http://pycon.blip.tv/file/3264041/


Unfortunately, that clip seems to be unwatchable, at least for me. It 
crashed the Netscape plugin in Konqueror, and crashed Firefox. When I 
downloaded the ogv file, it crashed MPlayer and Kaffeine. Before 
crashing, in all four players, it displayed random blocks of colours and 
lines while the sound played.

Not a good advertisement for either BlipTV or Ogg :(


-- 
Steven



From googler.1.webmaster at spamgourmet.com  Tue Mar 16 07:52:37 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Tue, 16 Mar 2010 04:52:37 -0700 (PDT)
Subject: C-API PyObject_Call
Message-ID: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>

Hi,

i have a serious problem and I am looking for a solution. I pass an
instance of a class from a file to PyObject_Call. When something
fails, I get a full traceback. If it succeeds, I get the return value.

Is it possible to get information from which line/file the return
value of PyObject_Call is?

Thanks!!

moerchendiser2k3


From Ron.Barak at lsi.com  Tue Mar 16 07:54:01 2010
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Tue, 16 Mar 2010 11:54:01 +0000
Subject: How to add a library path to pythonpath ?
In-Reply-To: <mailman.62.1268737204.24845.python-list@python.org>
References: <mailman.62.1268737204.24845.python-list@python.org>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>

Hi,

I'm trying to add a library path to my pythonpath, but seems it is not accepted -

On Windows DOS window:

C:\>echo %PYTHONPATH%
c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\

C:\>python -c "import sys ; print sys.path"
['', 'c:\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib', 'C:\\WINDOWS\\syst
em32\\python26.zip', 'C:\\Python26\\DLLs', 'C:\\Python26\\lib', 'C:\\Python26\\l
ib\\plat-win', 'C:\\Python26\\lib\\lib-tk', 'C:\\Python26', 'C:\\Python26\\lib\\
site-packages', 'C:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']

C:\>

On Windows cygwin:

$ echo $PYTHONPATH
.:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/

$ python -c "import sys ; print sys.path"
['', '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib', 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs', 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win', 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26', 'c:\\Python26\\lib\\site-packages', 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']

$

What am I doing wrong ?

Thanks,
Ron.


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From eckhardt at satorlaser.com  Tue Mar 16 07:56:36 2010
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Tue, 16 Mar 2010 12:56:36 +0100
Subject: import antigravity
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
Message-ID: <k88477-giu.ln1@satorlaser.homedns.org>

Chris Rebert wrote:
> You're a bit behind the times.
> If my calculations are right, that comic is over 2 years old.

import timetravel

Uli



From Ron.Barak at lsi.com  Tue Mar 16 07:56:47 2010
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Tue, 16 Mar 2010 11:56:47 +0000
Subject: Recall: How to add a library path to pythonpath ?
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF684F3C839@enbmail01.lsi.com>

Barak, Ron would like to recall the message, "How to add a library path to pythonpath ?".

From jan at jandecaluwe.com  Tue Mar 16 08:10:09 2010
From: jan at jandecaluwe.com (Jan Decaluwe)
Date: Tue, 16 Mar 2010 13:10:09 +0100
Subject: The first ASIC designed with MyHDL
Message-ID: <4b9f7414$0$2887$ba620e4c@news.skynet.be>

I am proud to report on the first ASIC product
designed with MyHDL (afaik).

http://www.jandecaluwe.com/hdldesign/digmac.html

-- 
Jan Decaluwe - Resources bvba - http://www.jandecaluwe.com
 Python as a HDL: http://www.myhdl.org
 VHDL development, the modern way: http://www.sigasi.com
 Analog design automation: http://www.mephisto-da.com
 World-class digital design: http://www.easics.com


From clp2 at rebertia.com  Tue Mar 16 08:13:20 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 16 Mar 2010 05:13:20 -0700
Subject: import antigravity
In-Reply-To: <k88477-giu.ln1@satorlaser.homedns.org>
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
	<k88477-giu.ln1@satorlaser.homedns.org>
Message-ID: <50697b2c1003160513y7bf2dd8ew9020ddf76f048121@mail.gmail.com>

On Tue, Mar 16, 2010 at 4:56 AM, Ulrich Eckhardt
<eckhardt at satorlaser.com> wrote:
> Chris Rebert wrote:
>> You're a bit behind the times.
>> If my calculations are right, that comic is over 2 years old.
>
> import timetravel
>
> Uli

So that's where Guido's been hiding his infamous time machine! Right
in plain sight!
It's so obvious in retrospect.

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


From alfps at start.no  Tue Mar 16 08:13:26 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Tue, 16 Mar 2010 13:13:26 +0100
Subject: import antigravity
In-Reply-To: <k88477-giu.ln1@satorlaser.homedns.org>
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
	<k88477-giu.ln1@satorlaser.homedns.org>
Message-ID: <hnnslb$pqp$1@news.eternal-september.org>

* Ulrich Eckhardt:
> Chris Rebert wrote:
>> You're a bit behind the times.
>> If my calculations are right, that comic is over 2 years old.
> 
> import timetravel

   C:\test> python
   Python 3.1.1 (r311:74483, Aug 17 2009, 17:02:12) [MSC v.1500 32 bit (Intel)]
   on win32
   Type "help", "copyright", "credits" or "license" for more information.
   >>> import time
   >>> time.altzone
   -7200
   >>> # hm.
   ...
   >>> _


Cheers,

- Alf


From rikutheronin at gmail.com  Tue Mar 16 08:27:22 2010
From: rikutheronin at gmail.com (Pablo Recio Quijano)
Date: Tue, 16 Mar 2010 13:27:22 +0100
Subject: How to add a library path to pythonpath ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>
References: <mailman.62.1268737204.24845.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>
Message-ID: <1fb1c371003160527q10add6bfk75c09b24bc486329@mail.gmail.com>

You have to add yout path to the list:

import sys
sys.path.append(your_path)

Jus simple to add the element on the list :)

2010/3/16 Barak, Ron <Ron.Barak at lsi.com>

>  Hi,
>
> I'm trying to add a library path to my pythonpath, but seems it is not
> accepted -
>
> On Windows DOS window:
>
> C:\>echo %PYTHONPATH%
> c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\
>
> C:\>python -c "import sys ; print sys.path"
> ['', 'c:\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
> 'C:\\WINDOWS\\syst
> em32\\python26.zip', 'C:\\Python26\\DLLs', 'C:\\Python26\\lib',
> 'C:\\Python26\\l
> ib\\plat-win', 'C:\\Python26\\lib\\lib-tk', 'C:\\Python26',
> 'C:\\Python26\\lib\\
> site-packages', 'C:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
>
> C:\>
>
> On Windows cygwin:
>
> $ echo $PYTHONPATH
> .:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
>
> $ python -c "import sys ; print sys.path"
> ['', '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
> 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs',
> 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win',
> 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26',
> 'c:\\Python26\\lib\\site-packages',
> 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
>
> $
>
> What am I doing wrong ?
>
> Thanks,
> Ron.
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


-- 
Pablo Recio Quijano

Estudiante de Ingenier?a Inform?tica (UCA)
Alumno colaborador del Departamento de Lenguajes y Sistemas Inform?ticos
Participante del IV Concurso Universitario de Software Libre
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From davea at ieee.org  Tue Mar 16 08:35:54 2010
From: davea at ieee.org (Dave Angel)
Date: Tue, 16 Mar 2010 07:35:54 -0500
Subject: class inheritance
In-Reply-To: <7088c1e1-9a1f-42d8-aac2-5ba19806165a@o30g2000yqb.googlegroups.com>
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>	<9bb4c1e7-858e-4ee6-870b-5a6549b6c496@b36g2000pri.googlegroups.com>
	<05d0d40f-3fa0-4095-875d-777b49122d12@l12g2000prg.googlegroups.com>
	<7088c1e1-9a1f-42d8-aac2-5ba19806165a@o30g2000yqb.googlegroups.com>
Message-ID: <4B9F7B2A.1080906@ieee.org>



Carl Banks wrote:
> On Mar 15, 4:34 pm, JLundell <jlund... at pobox.com> wrote:
>   
>> It's also unfortunate that Python doesn't have an approximately-equal
>> operator; it'd come in handy for floating-point applications while
>> preserving hash. If only there were a ~=r ? operator I could
>> overload. And ~ is unary, so no joy.
>>     
>
> One problem with it is that there's no way to make it universal;
> different appiplications have different ideas of close.  Conceivably
> it could be usefully defined for a user type though..
>
> Bacause of this problem almost no languages have an almost equal
> operator.  I'm curious what languages do, of if there are any with a
> trinary operator that also takes a threshold.
>
> Carl Banks
>
>   
If I recall correctly, APL has a *fuzz* value, which is used in all(?) 
comparisons. But I do not recall anything about how it was defined. I do 
recall that you could change the threshold, and suspect it was relative 
to the operands. For symmetry, it would probably have to be relative to 
the average of the two values, or some such.


From basaka.chen at gmail.com  Tue Mar 16 08:53:35 2010
From: basaka.chen at gmail.com (freakrobot)
Date: Tue, 16 Mar 2010 05:53:35 -0700 (PDT)
Subject: what's the diffence between "RECENT" and "UNSEEN" in imaplib?
Message-ID: <2583d700-db3c-4291-ae18-46f96b02a92d@s25g2000prd.googlegroups.com>

When I work with the imaplib,
there is a imap4.status(mailboxname, '(MESSAGES RECENT UNSEEN)')
function.

So I really wonder what's the difference between RECENT and UNSEEN
conditions.
And what kind of messages belong to RECENT condition?
Thank you~


From dmj.ccc at gmail.com  Tue Mar 16 08:57:05 2010
From: dmj.ccc at gmail.com (david jensen)
Date: Tue, 16 Mar 2010 05:57:05 -0700 (PDT)
Subject: Searching for most pythonic/least stupid way to do something simple
Message-ID: <d62c4091-e0f0-4195-9b0e-dd597f9d0131@u9g2000yqb.googlegroups.com>

Hi all,

This may be a complete brainfart, but it's been puzzling me for a day
or two (!).
Sorry for not describing "something" in the subject, but it's hard to
describe succinctly:

I have a short list of non-zero positive integers (say
myList=[2,5,8,3,5]). I need to return five lists of non-negative
numbers, such that for five different "share sizes", myList[0] and
myList[1] will share twice the smaller amount...

def getOutcomes():
    outcomes=[]
    if myList[0]<=myList[1]:
        amountToShare=2*myList[0]
        remainder=myList[1]-myList[0]
        outcome.append((amountToShare, remainder)+myList[2:])   #
shares are (100%, 0)
        outcome.append((amountToShare*0.75, remainder
+amountToShare*0.25)+myList[2:])   #shares are (75%, 25%), and exactly
the same for (50%,50%), (25%, 75%), and (0,100%)
...
...
    return outcomes

i.e. for the above myList, outcomes=[[4,1,8,3,5], [3,2,8,3,5],
[2,5,8,3,5],[1,6,8,3,5],[0,7,8,3,5]]

if myList[0]>myList[1], i want exactly the opposite to happen (i.e.,
just switching what happens to positions 0 and 1)

Obviously, i can just write the code again, in an else, switching
indices 0 and 1. Or, I could just have a test at the beginning, switch
them if they are in the order "big, small", and then switch them again
at the end in a list comprehension. Both ideas seem terribly silly,
and there must be an obvious way to do it that I'm not seeing.

any help?

many thanks

dmj


From motoom at xs4all.nl  Tue Mar 16 09:00:41 2010
From: motoom at xs4all.nl (Michiel Overtoom)
Date: Tue, 16 Mar 2010 14:00:41 +0100
Subject: Understanding the CPython dict implementation
In-Reply-To: <4b9f6fab$0$27822$c3e8da3@news.astraweb.com>
References: <mailman.768.1268610003.23598.python-list@python.org>
	<4b9f6fab$0$27822$c3e8da3@news.astraweb.com>
Message-ID: <B11E9EC5-3187-44B2-8182-930AB92AC6A5@xs4all.nl>


On 16 Mar 2010, at 12:46 , Steven D'Aprano wrote:

> On Sun, 14 Mar 2010 19:39:46 -0400, Terry Reedy wrote:
> 
>> I found this PyCon2010 presentation to be excellent: The Mighty
>> Dictionary, Branden Craig Rhodes, 30 min.
>> http://pycon.blip.tv/file/3264041/
> 
> 
> Unfortunately, that clip seems to be unwatchable, at least for me. It 
> crashed the Netscape plugin in Konqueror, and crashed Firefox. When I 
> downloaded the ogv file, it crashed MPlayer and Kaffeine.

It played in VLC without problems.

Greetings,




From dmj.ccc at gmail.com  Tue Mar 16 09:05:30 2010
From: dmj.ccc at gmail.com (david jensen)
Date: Tue, 16 Mar 2010 06:05:30 -0700 (PDT)
Subject: Searching for most pythonic/least stupid way to do something 
	simple
References: <d62c4091-e0f0-4195-9b0e-dd597f9d0131@u9g2000yqb.googlegroups.com>
Message-ID: <dad44252-fcff-4f4b-9182-e52c28332cc6@g10g2000yqh.googlegroups.com>

... and of course i screwed up my outcomes... that should read
outcomes=[[4,3,8,3,5],[3,4,8,3,5],[2,5,8,3,5],[1,6,8,3,5],[0,7,8,3,5]]





From kw at codebykevin.com  Tue Mar 16 09:22:29 2010
From: kw at codebykevin.com (Kevin Walzer)
Date: Tue, 16 Mar 2010 09:22:29 -0400
Subject: Build Python with XCode
In-Reply-To: <ad4dd1ba-8f4f-4bdf-9860-56c9c899889d@t41g2000yqt.googlegroups.com>
References: <ad4dd1ba-8f4f-4bdf-9860-56c9c899889d@t41g2000yqt.googlegroups.com>
Message-ID: <2c74f$4b9f8616$4275d90a$4845@FUSE.NET>

On 3/15/10 11:15 PM, moerchendiser2k3 wrote:
> Hi,
>
> I would like to build Python with Xcode (but without the makefile).
> Does anyone know a link where I can get a real xcodeproj with the
> current Py2.x sources?
>
>
> Thanks in advance!! Bye, donnerCobra

I don't think one exists--I build my Python on OS Xwith configure, make 
etc.-- but you could try asking on the MacPython list.

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


From chris at simplistix.co.uk  Tue Mar 16 09:47:12 2010
From: chris at simplistix.co.uk (Chris Withers)
Date: Tue, 16 Mar 2010 13:47:12 +0000
Subject: converting a timezone-less datetime to seconds since the epoch
Message-ID: <4B9F8BE0.2050808@simplistix.co.uk>

Hi All,

We have a bunch of datetime objects that have tzinfo=None.
We want to turn them into float timestamps in seconds since the epoch.

Here's the first attempt:

import time
from datetime import datetime
from unittest import TestCase

def timestamp(dttm):
     return time.mktime(dttm.timetuple())

class Test(TestCase):

     def check(self,*args):
         epoch = datetime.utcfromtimestamp(0)
         dt = datetime(*args)
         actual = timestamp(dt)
         d = dt - epoch
         expected = d.seconds + 60*60*24*d.days
         self.assertEquals(expected,actual,
             '%s != %s (diff %s)'%(expected,actual,expected-actual))

     def test_xmas(self):
         self.check(2009, 12, 25, 1, 2, 3, 456789)

     def test_midsummer(self):
         self.check(2009, 6, 21, 2, 3, 4, 5678)

For me, test_midsummer fails. I'd be interested in knowing wheher both 
tests pass for other people.

I'd be *more* interested in knowing either why the timestamp function or 
the tests are wrong and how to correct them...

cheers,

Chris



From pruebauno at latinmail.com  Tue Mar 16 09:48:11 2010
From: pruebauno at latinmail.com (nn)
Date: Tue, 16 Mar 2010 06:48:11 -0700 (PDT)
Subject: Searching for most pythonic/least stupid way to do something 
	simple
References: <d62c4091-e0f0-4195-9b0e-dd597f9d0131@u9g2000yqb.googlegroups.com>
	<dad44252-fcff-4f4b-9182-e52c28332cc6@g10g2000yqh.googlegroups.com>
Message-ID: <53f1fd53-7f83-418d-b3f8-ced6f2e929af@g10g2000yqh.googlegroups.com>



david jensen wrote:
> ... and of course i screwed up my outcomes... that should read
> outcomes=[[4,3,8,3,5],[3,4,8,3,5],[2,5,8,3,5],[1,6,8,3,5],[0,7,8,3,5]]

For starters:

def getOutcomes(myList=[2,5,8,3,5]):
   low_id = int(myList[0]>myList[1])
   amountToShare = 2*myList[low_id]
   remainder = myList[not low_id]-myList[low_id]
   tail=myList[2:]
   outcomes = [[amountToShare*perc, remainder+amountToShare*(1-perc)]
+ tail
             for perc in (1.0, 0.75, 0.5, 0.25, 0.0)]
   return outcomes


From clp2 at rebertia.com  Tue Mar 16 09:57:14 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 16 Mar 2010 06:57:14 -0700
Subject: what's the diffence between "RECENT" and "UNSEEN" in imaplib?
In-Reply-To: <2583d700-db3c-4291-ae18-46f96b02a92d@s25g2000prd.googlegroups.com>
References: <2583d700-db3c-4291-ae18-46f96b02a92d@s25g2000prd.googlegroups.com>
Message-ID: <50697b2c1003160657g22596349j5f4fb83382e90266@mail.gmail.com>

On Tue, Mar 16, 2010 at 5:53 AM, freakrobot <basaka.chen at gmail.com> wrote:
> When I work with the imaplib,
> there is a imap4.status(mailboxname, '(MESSAGES RECENT UNSEEN)')
> function.
>
> So I really wonder what's the difference between RECENT and UNSEEN
> conditions.
> And what kind of messages belong to RECENT condition?

A. Your question is not Python-specific and would better have been
asked somewhere more relevant.

B. RTFRFC: http://www.faqs.org/rfcs/rfc3501.html
"""
UNSEEN The number of messages which do not have the \Seen flag set.
[...]

\Seen
           Message has been read

\Recent
           Message is "recently" arrived in this mailbox. This session
is the first session to have been notified about this message; if the
session is read-write, subsequent sessions will not see \Recent set
for this message. This flag can not be altered by the client. If it is
not possible to determine whether or not this session is the first
session to be notified about a message, then that message SHOULD be
considered recent. If multiple connections have the same mailbox
selected simultaneously, it is undefined which of these connections
will see newly-arrived messages with \Recent set and which will see it
without \Recent set.
"""

Regards,
Chris
--
http://blog.rebertia.com


From clp2 at rebertia.com  Tue Mar 16 10:13:04 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 16 Mar 2010 07:13:04 -0700
Subject: converting a timezone-less datetime to seconds since the epoch
In-Reply-To: <4B9F8BE0.2050808@simplistix.co.uk>
References: <4B9F8BE0.2050808@simplistix.co.uk>
Message-ID: <50697b2c1003160713x7641d2cfn52a5e5ca199e26de@mail.gmail.com>

On Tue, Mar 16, 2010 at 6:47 AM, Chris Withers <chris at simplistix.co.uk> wrote:
> Hi All,
>
> We have a bunch of datetime objects that have tzinfo=None.
> We want to turn them into float timestamps in seconds since the epoch.
>
> Here's the first attempt:
>
> import time
> from datetime import datetime
> from unittest import TestCase
>
> def timestamp(dttm):
> ? ?return time.mktime(dttm.timetuple())

from calendar import timegm

def timestamp(dttm):
    return timegm(dttm.utctimetuple())
#the *utc*timetuple change is just for extra consistency
#it shouldn't actually make a difference here

And problem solved. As for what the problem was:

Paraphrasing the table I got added to the time module docs:
(http://docs.python.org/library/time.html)

To convert from struct_time in ***UTC***
to seconds since the epoch
use calendar.timegm()

To convert struct_time in ***local*** time
to seconds since the epoch
use time.mktime()

> I'd be *more* interested in knowing either why the timestamp function or the
> tests are wrong and how to correct them...

You used a function intended for local times on UTC time data, and
therefore got incorrect results.

Cheers,
Chris
--
Entering the workforce in 2012
http://blog.rebertia.com


From invalid at invalid.invalid  Tue Mar 16 10:20:26 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Tue, 16 Mar 2010 14:20:26 +0000 (UTC)
Subject: subtraction is giving me a syntax error
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
	<mailman.800.1268675343.23598.python-list@python.org>
	<hnlt4p$4j1$1@reader1.panix.com>
	<4b9eb5bd$0$27822$c3e8da3@news.astraweb.com>
	<hnmduj$gnp$1@reader1.panix.com>
	<pan.2010.03.16.07.47.45@REMOVE.THIS.cybersource.com.au>
Message-ID: <hno43a$lh8$1@reader1.panix.com>

On 2010-03-16, Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:

>> Though it may not be Microsoft Word, I think I'd still maintain that
>> an editor where you can't see a ctrl-Z or tell the difference between
>> an ASCII minus and a windows-codepage-whatever isn't a very good
>> programmer's editor.
>
> Regarding ctrl-Z (or for that matter other control characters), I
> agree it's a lack.
>
> As for not being able to see the difference between a hyphen and an
> EN- dash, or minus sign, or whatever it is, yes but they are very
> similar looking glyphs in virtually ever modern font. It would take a
> good eye to see the difference between (say) ??? ??? and -.

My point is that if it's an ASCII file, then rendering \x96 as an
em-dash isn't correct.  I'd expect it to show up highlighted somehow
in hex or octal so that I know it's a non-ASCII character.

-- 
Grant Edwards               grant.b.edwards        Yow! We are now enjoying
                                  at               total mutual interaction in
                              gmail.com            an imaginary hot tub ...


From steve at holdenweb.com  Tue Mar 16 10:24:36 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 16 Mar 2010 10:24:36 -0400
Subject: C-API PyObject_Call
In-Reply-To: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
Message-ID: <hno4b7$llt$1@dough.gmane.org>

moerchendiser2k3 wrote:
> Hi,
> 
> i have a serious problem and I am looking for a solution. I pass an
> instance of a class from a file to PyObject_Call. When something
> fails, I get a full traceback. If it succeeds, I get the return value.
> 
> Is it possible to get information from which line/file the return
> value of PyObject_Call is?
> 
> Thanks!!
> 
> moerchendiser2k3

You'll need to use a debugger like gdb that gives you access to the C
stack, I believe.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From Ron.Barak at lsi.com  Tue Mar 16 10:26:50 2010
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Tue, 16 Mar 2010 14:26:50 +0000
Subject: How to add a library path to pythonpath ?
In-Reply-To: <1fb1c371003160527q10add6bfk75c09b24bc486329@mail.gmail.com>
References: <mailman.62.1268737204.24845.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>
	<1fb1c371003160527q10add6bfk75c09b24bc486329@mail.gmail.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF684F3C883@enbmail01.lsi.com>

Thanks for the suggestion Pable.

However, I really need the $PYTHONPATH to include this additional library, so all Python scripts could use it.

In Windows I have defined PYTHONPATH as c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\, and also in the Windows registry I have

HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\version\PythonPath\ as C:\Python26\Lib;C:\Python26\DLLs;C:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\;C:\Python26\Lib\lib-tk;

However, even with all the above, the SVMInspecor modules are not found.

Bye,
Ron.

________________________________
From: Pablo Recio Quijano [mailto:rikutheronin at gmail.com]
Sent: Tuesday, March 16, 2010 2:27 PM
To: python-list at python.org
Subject: Re: How to add a library path to pythonpath ?

You have to add yout path to the list:

import sys
sys.path.append(your_path)

Jus simple to add the element on the list :)

2010/3/16 Barak, Ron <Ron.Barak at lsi.com<mailto:Ron.Barak at lsi.com>>

Hi,

I'm trying to add a library path to my pythonpath, but seems it is not accepted -

On Windows DOS window:

C:\>echo %PYTHONPATH%
c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\

C:\>python -c "import sys ; print sys.path"
['', 'c:\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib', 'C:\\WINDOWS\\syst
em32\\python26.zip', 'C:\\Python26\\DLLs', 'C:\\Python26\\lib', 'C:\\Python26\\l
ib\\plat-win', 'C:\\Python26\\lib\\lib-tk', 'C:\\Python26', 'C:\\Python26\\lib\\
site-packages', 'C:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']

C:\>

On Windows cygwin:

$ echo $PYTHONPATH
.:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/

$ python -c "import sys ; print sys.path"
['', '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib', 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs', 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win', 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26', 'c:\\Python26\\lib\\site-packages', 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']

$

What am I doing wrong ?

Thanks,
Ron.



--
http://mail.python.org/mailman/listinfo/python-list




--
Pablo Recio Quijano

Estudiante de Ingenier?a Inform?tica (UCA)
Alumno colaborador del Departamento de Lenguajes y Sistemas Inform?ticos
Participante del IV Concurso Universitario de Software Libre
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From grflanagan at gmail.com  Tue Mar 16 10:28:17 2010
From: grflanagan at gmail.com (Gerard Flanagan)
Date: Tue, 16 Mar 2010 14:28:17 +0000
Subject: Searching for most pythonic/least stupid way to do something
	simple
In-Reply-To: <dad44252-fcff-4f4b-9182-e52c28332cc6@g10g2000yqh.googlegroups.com>
References: <d62c4091-e0f0-4195-9b0e-dd597f9d0131@u9g2000yqb.googlegroups.com>
	<dad44252-fcff-4f4b-9182-e52c28332cc6@g10g2000yqh.googlegroups.com>
Message-ID: <hno4i2$ncn$1@dough.gmane.org>

david jensen wrote:
> ... and of course i screwed up my outcomes... that should read
> outcomes=[[4,3,8,3,5],[3,4,8,3,5],[2,5,8,3,5],[1,6,8,3,5],[0,7,8,3,5]]
> 
> 
> 

abstracting the given algorithm:

def iterweights(N):
     d = 1.0/(N-1)
     for i in xrange(N):
         yield i*d, (N-1-i)*d

def iterparts(x0, x1, N):
     a = min(x0, x1)
     b = max(x0, x1)
     s = 2 * a
     t = b - a
     for m, n in iterweights(N):
         if a == x0:
             yield s*m, s*n+t
         else:
             yield s*n+t, s*m

for p in iterparts(2, 5, 5):
     print p

print

for p in iterparts(5, 2, 5):
     print p

(0.0, 7.0)
(1.0, 6.0)
(2.0, 5.0)
(3.0, 4.0)
(4.0, 3.0)

(7.0, 0.0)
(6.0, 1.0)
(5.0, 2.0)
(4.0, 3.0)
(3.0, 4.0)



From Dieter.Faulbaum at bessy.de  Tue Mar 16 10:30:51 2010
From: Dieter.Faulbaum at bessy.de (Dieter Faulbaum)
Date: Tue, 16 Mar 2010 15:30:51 +0100
Subject: cycling through options
Message-ID: <rie7hpcs5ic.fsf@alder.acc.bessy.de>


Hello,

is there a better way for cycling through all options than this:


(options, args) = parser.parse_args()
for opt in options.__dict__.keys():
     print opt, ":", options.__dict__[opt]


Thanks for any nicer solution

-- 
Dieter Faulbaum


From steve at holdenweb.com  Tue Mar 16 10:31:02 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 16 Mar 2010 10:31:02 -0400
Subject: How to add a library path to pythonpath ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>
References: <mailman.62.1268737204.24845.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>
Message-ID: <hno4na$o98$1@dough.gmane.org>

Barak, Ron wrote:
> Hi,
> 
> I'm trying to add a library path to my pythonpath, but seems it is not
> accepted -
> 
> On Windows DOS window:
> 
> C:\>echo %PYTHONPATH%
> c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\
>  
That looks like it should work. The only thing I notice is that I don't
have a trailing backslash on my Windows PYTHONPATH. Could that be the
problem?

regards
 Steve

> C:\>python -c "import sys ; print sys.path"
> ['', 'c:\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
> 'C:\\WINDOWS\\syst
> em32\\python26.zip', 'C:\\Python26\\DLLs', 'C:\\Python26\\lib',
> 'C:\\Python26\\l
> ib\\plat-win', 'C:\\Python26\\lib\\lib-tk', 'C:\\Python26',
> 'C:\\Python26\\lib\\
> site-packages', 'C:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
> 
> C:\>
> 
> On Windows cygwin:
> 
> $ echo $PYTHONPATH
> .:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
> 
> $ python -c "import sys ; print sys.path"
> ['',
> '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
> 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs',
> 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win',
> 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26',
> 'c:\\Python26\\lib\\site-packages',
> 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
> 
> $
> 
> What am I doing wrong ?
> 
> Thanks,
> Ron.
> 
> 
>  
> 


-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From davea at ieee.org  Tue Mar 16 11:03:44 2010
From: davea at ieee.org (Dave Angel)
Date: Tue, 16 Mar 2010 10:03:44 -0500
Subject: How to add a library path to pythonpath ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF684F3C883@enbmail01.lsi.com>
References: <mailman.62.1268737204.24845.python-list@python.org>	<7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>	<1fb1c371003160527q10add6bfk75c09b24bc486329@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C883@enbmail01.lsi.com>
Message-ID: <4B9F9DD0.2080306@ieee.org>



Barak, Ron wrote:
> Thanks for the suggestion Pable.
>
> However, I really need the $PYTHONPATH to include this additional library, so all Python scripts could use it.
>
> In Windows I have defined PYTHONPATH as c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\, and also in the Windows registry I have
>
> HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\version\PythonPath\ as C:\Python26\Lib;C:\Python26\DLLs;C:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\;C:\Python26\Lib\lib-tk;
>
> However, even with all the above, the SVMInspecor modules are not found.
>
>   
See my response at the end.  Top-posting makes for a very confusing thread.
> <snip>
>
> 2010/3/16 Barak, Ron <Ron.Barak at lsi.com<mailto:Ron.Barak at lsi.com>>
>
> Hi,
>
> I'm trying to add a library path to my pythonpath, but seems it is not accepted -
>
> On Windows DOS window:
>
> C:\>echo %PYTHONPATH%
> c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\
>
> C:\>python -c "import sys ; print sys.path"
> ['', 'c:\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib', 'C:\\WINDOWS\\syst
> em32\\python26.zip', 'C:\\Python26\\DLLs', 'C:\\Python26\\lib', 'C:\\Python26\\l
> ib\\plat-win', 'C:\\Python26\\lib\\lib-tk', 'C:\\Python26', 'C:\\Python26\\lib\\
> site-packages', 'C:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
>
> C:\>
>
> On Windows cygwin:
>
> $ echo $PYTHONPATH
> .:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
>
> $ python -c "import sys ; print sys.path"
> ['', '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib', 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs', 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win', 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26', 'c:\\Python26\\lib\\site-packages', 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
>
> $
>
> What am I doing wrong ?
>
> Thanks,
> Ron.
>
>
>   
In your original message, what you displayed worked exactly as 
expected.  As you didn't say what made you think something was wrong, I 
ignored the message.

Now, you say that some modules are not found.  So how about giving some 
more specifics so someone can actually debug the problem.  Pick a 
particular module, tell us the complete path to that module, and show us 
both the sys.path strings (which look correct for the Windows case, and 
of course bogus for the cygwin case), as well as the offending import 
statement and its traceback.

DaveA


From robert.kern at gmail.com  Tue Mar 16 11:06:10 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 16 Mar 2010 10:06:10 -0500
Subject: class inheritance
In-Reply-To: <4B9F7B2A.1080906@ieee.org>
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>	<9bb4c1e7-858e-4ee6-870b-5a6549b6c496@b36g2000pri.googlegroups.com>	<05d0d40f-3fa0-4095-875d-777b49122d12@l12g2000prg.googlegroups.com>	<7088c1e1-9a1f-42d8-aac2-5ba19806165a@o30g2000yqb.googlegroups.com>
	<4B9F7B2A.1080906@ieee.org>
Message-ID: <hno6p2$upb$1@dough.gmane.org>

On 2010-03-16 07:35 AM, Dave Angel wrote:
>
>
> Carl Banks wrote:
>> On Mar 15, 4:34 pm, JLundell <jlund... at pobox.com> wrote:
>>> It's also unfortunate that Python doesn't have an approximately-equal
>>> operator; it'd come in handy for floating-point applications while
>>> preserving hash. If only there were a ~=r ? operator I could
>>> overload. And ~ is unary, so no joy.
>>
>> One problem with it is that there's no way to make it universal;
>> different appiplications have different ideas of close. Conceivably
>> it could be usefully defined for a user type though..
>>
>> Bacause of this problem almost no languages have an almost equal
>> operator. I'm curious what languages do, of if there are any with a
>> trinary operator that also takes a threshold.
>>
>> Carl Banks
>>
> If I recall correctly, APL has a *fuzz* value, which is used in all(?)
> comparisons. But I do not recall anything about how it was defined. I do
> recall that you could change the threshold, and suspect it was relative
> to the operands. For symmetry, it would probably have to be relative to
> the average of the two values, or some such.

The problem is that frequently there is no system-wide fuzz value which is 
appropriate for all comparisons in a given program. You need to choose the right 
value for each comparison. Consequently, you might as well use a function 
instead of an operator and a global variable.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From no.email at nospam.invalid  Tue Mar 16 11:09:37 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Tue, 16 Mar 2010 08:09:37 -0700
Subject: Searching for most pythonic/least stupid way to do something
	simple
References: <d62c4091-e0f0-4195-9b0e-dd597f9d0131@u9g2000yqb.googlegroups.com>
Message-ID: <7xmxy87172.fsf@ruckus.brouhaha.com>

david jensen <dmj.ccc at gmail.com> writes:
> Obviously, i can just write the code again, in an else, switching
> indices 0 and 1. Or, I could just have a test at the beginning, switch
> them if they are in the order "big, small", and then switch them again
> at the end in a list comprehension. Both ideas seem terribly silly,
> and there must be an obvious way to do it that I'm not seeing.

Generally when faced with this kind of question, see if you can
use the built-in min and max functions:

    def getOutcomes():
        outcomes=[]
        smaller = min(myList[0], myList[1])
        bigger  = max(myList[0], myList[1])
        amountToShare=2*smaller
        remainder = bigger - smaller
        ...


From dmj.ccc at gmail.com  Tue Mar 16 11:21:41 2010
From: dmj.ccc at gmail.com (david jensen)
Date: Tue, 16 Mar 2010 08:21:41 -0700 (PDT)
Subject: Searching for most pythonic/least stupid way to do something 
	simple
References: <d62c4091-e0f0-4195-9b0e-dd597f9d0131@u9g2000yqb.googlegroups.com>
	<dad44252-fcff-4f4b-9182-e52c28332cc6@g10g2000yqh.googlegroups.com>
Message-ID: <05fe1942-231f-4674-a55a-77ebca451da6@g4g2000yqa.googlegroups.com>

Thank you both very much!

Yeah: it was a total brainfart on my part: nn's solution should have
been obvious.

As the general solution, i like your approach, Gerard, but I think
I'll stick to nn's, the one i should have written.

Again, thank you both!

dmj


From Ron.Barak at lsi.com  Tue Mar 16 11:25:16 2010
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Tue, 16 Mar 2010 15:25:16 +0000
Subject: How to add a library path to pythonpath ?
In-Reply-To: <4B9F9DD0.2080306@ieee.org>
References: <mailman.62.1268737204.24845.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>
	<1fb1c371003160527q10add6bfk75c09b24bc486329@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C883@enbmail01.lsi.com>
	<4B9F9DD0.2080306@ieee.org>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF684F3C894@enbmail01.lsi.com>



> -----Original Message-----
> From: Dave Angel [mailto:davea at ieee.org]
> Sent: Tuesday, March 16, 2010 5:04 PM
> To: Barak, Ron
> Cc: Pablo Recio Quijano; python-list at python.org
> Subject: RE: How to add a library path to pythonpath ?
>
>
>
> Barak, Ron wrote:
> > Thanks for the suggestion Pable.
> >
> > However, I really need the $PYTHONPATH to include this
> additional library, so all Python scripts could use it.
> >
> > In Windows I have defined PYTHONPATH as
> > c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\, and also in the
> > Windows registry I have
> >
> >
> HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\version\PythonPath\ as
> >
> C:\Python26\Lib;C:\Python26\DLLs;C:\views\cc_view\TS_svm_ts_tool\SVMIn
> > spector\lib\;C:\Python26\Lib\lib-tk;
> >
> > However, even with all the above, the SVMInspecor modules
> are not found.
> >
> >
> See my response at the end.  Top-posting makes for a very
> confusing thread.
> > <snip>
> >
> > 2010/3/16 Barak, Ron <Ron.Barak at lsi.com<mailto:Ron.Barak at lsi.com>>
> >
> > Hi,
> >
> > I'm trying to add a library path to my pythonpath, but
> seems it is not
> > accepted -
> >
> > On Windows DOS window:
> >
> > C:\>echo %PYTHONPATH%
> > c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\
> >
> > C:\>python -c "import sys ; print sys.path"
> > ['', 'c:\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
> > 'C:\\WINDOWS\\syst em32\\python26.zip', 'C:\\Python26\\DLLs',
> > 'C:\\Python26\\lib', 'C:\\Python26\\l ib\\plat-win',
> > 'C:\\Python26\\lib\\lib-tk', 'C:\\Python26', 'C:\\Python26\\lib\\
> > site-packages',
> > 'C:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
> >
> > C:\>
> >
> > On Windows cygwin:
> >
> > $ echo $PYTHONPATH
> > .:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
> >
> > $ python -c "import sys ; print sys.path"
> > ['',
> >
> '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
> > 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs',
> > 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win',
> > 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26',
> > 'c:\\Python26\\lib\\site-packages',
> > 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
> >
> > $
> >
> > What am I doing wrong ?
> >
> > Thanks,
> > Ron.
> >
> >
> >
> In your original message, what you displayed worked exactly
> as expected.  As you didn't say what made you think something
> was wrong, I ignored the message.
>
> Now, you say that some modules are not found.  So how about
> giving some more specifics so someone can actually debug the
> problem.  Pick a particular module, tell us the complete path
> to that module, and show us both the sys.path strings (which
> look correct for the Windows case, and of course bogus for
> the cygwin case), as well as the offending import statement
> and its traceback.
>
> DaveA

Hi Dave,

My Python is the Windows Python (I need this for wxPython):

$ ls -ls `which python`
1 lrwxrwxrwx 1 rbarak mkgroup-l-d 31 Mar  4 14:02 /usr/bin/python -> /cygdrive/c/Python26/python.exe

Here's a demo script:

#!/usr/bin/env python

import sys
print "\n",sys.path,"\n"

from ErrorManager.ErrorManager import ErrorManager

And it's run produces:

$ python -u  tmp.py

['c:\\views\\cc_view\\TS_svm_ts_tool\\svm_ts_tool', '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib', 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs', 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win', 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26', 'c:\\Python26\\lib\\site-packages', 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']

Traceback (most recent call last):
  File "tmp.py", line 6, in <module>
    from ErrorManager.ErrorManager import ErrorManager
ImportError: No module named ErrorManager.ErrorManager

$ ls -ls /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/ErrorManager/ErrorManager.py
4 -rwxr-xr-x 1 rbarak ???????? 1843 Sep 21 19:16 /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/ErrorManager/ErrorManager.py

$ grep ErrorManager  /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
ErrorManager/ErrorManager.py
class ErrorManager:

$ echo $PYTHONPATH
.:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/

Please let me know if the above is enough, or you'd like to see the results from a Windows' DOS window.

Thanks,
Ron.
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From sam.bancal at gmail.com  Tue Mar 16 11:40:29 2010
From: sam.bancal at gmail.com (samb)
Date: Tue, 16 Mar 2010 08:40:29 -0700 (PDT)
Subject: affectation in if statement
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
	<mailman.823.1268727047.23598.python-list@python.org>
	<5c361012-1f7b-487f-915b-0f564b238be3@e1g2000yqh.googlegroups.com>
	<mailman.825.1268729621.23598.python-list@python.org>
	<8680128a-70a8-4dae-869b-108203be781c@y17g2000yqd.googlegroups.com>
	<ce7d69e9-c62b-44ae-b12b-922bb27bf458@c16g2000yqd.googlegroups.com> 
	<mailman.827.1268736984.23598.python-list@python.org>
Message-ID: <0e235861-54bc-4e0f-bfa1-7472dae8cbc4@30g2000yqi.googlegroups.com>

On Mar 16, 11:56?am, Jean-Michel Pichavant <jeanmic... at sequans.com>
wrote:
> samb wrote:
> > Hi,
>
> > I've found a work around, inspired from Rob Williscroft :
>
> > class ReMatch(object):
> > ? ? """
> > ? ? ? ? Object to be called :
> > ? ? ? ? 1st time : do a regexp.match and return the answer (args:
> > regexp, line)
> > ? ? ? ? 2nd time : return the previous result (args: prev)
> > ? ? """
> > ? ? def __call__(self, regexp='', line='', prev=False):
> > ? ? ? ? if prev:
> > ? ? ? ? ? ? return self.prev_match
> > ? ? ? ? self.prev_match = re.match(regexp, line)
> > ? ? ? ? return self.prev_match
>
> > re_match = ReMatch()
>
> > if re_match(r'define\s+(\S+)\s*{$', line):
> > ? ? m = re_match(prev=True)
> > ? ? # do some logic with m
> > elif re_match(r'include\s+(\S+)$', line):
> > ? ? m = re_match(prev=True)
> > ? ? # do some logic with m
> > else
> > ? ? # do some logic
>
> > Hope this is efficient ... I guess yes.
>
> > Cheers,
> > Sam
>
> What do you mean by efficient ? If you're talking about speed, make sure
> you care about it before doing some optimization.
> If you talk about readability then it is absolutely *not* efficient (to
> my humble opinion).
>
> define, include = re.match(r'define\s+(\S+)\s*{$', line),
> re.match(r'include\s+(\S+)$', line)
> if define:
> ? ? # do some stuff
> elif include:
> ? ? # do some other stuff
> else:
> ? ? # hello world
>
> If you then have some speed problem with that script, you'll start
> caring about how to execute if faster by making sure that only necessary
> calls to re.match are done.
>
> match = re.match(r'(define)\s+(\S+)\s*{$', line) or
> re.match(r'(include)\s+(\S+)$', line) # note that the second operand is
> executed only if the first is None
>
> if match.group(1) == 'define':
> ? ? # do some stuff with match.group(2)
>
> elif match.group(1) == 'include':
> ? ? # do some other stuff with match.group(2)
>
> else:
> ? ? # hello world
>
> JM

Hi,

Thanks Bruno for the simpler API!
And thanks Jean-Michel, your second suggestion is clearly the best I
see.

I meant efficient mainly in the readable aspect (important for future
maintenance) and secondary for speed of execution. For sure I didn't
want to run a regexp twice.

Regards,
Sam


From lists at cheimes.de  Tue Mar 16 11:56:28 2010
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 16 Mar 2010 16:56:28 +0100
Subject: How to add a library path to pythonpath ?
In-Reply-To: <hno4na$o98$1@dough.gmane.org>
References: <mailman.62.1268737204.24845.python-list@python.org>	<7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>
	<hno4na$o98$1@dough.gmane.org>
Message-ID: <4B9FAA2C.3060806@cheimes.de>

Steve Holden schrieb:
> Barak, Ron wrote:
>> Hi,
>>
>> I'm trying to add a library path to my pythonpath, but seems it is not
>> accepted -
>>
>> On Windows DOS window:
>>
>> C:\>echo %PYTHONPATH%
>> c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\
>>  
> That looks like it should work. The only thing I notice is that I don't
> have a trailing backslash on my Windows PYTHONPATH. Could that be the
> problem?

Yes, that's definitely a major issue on Windows. Windows' stat() method
returns an error for paths with a trailing (back)slash. For example
_stat("C:\\Windows") works but _stat("C:\\Windows\\") sets errno to
ENOENT or ENOTDIR. I got bitten by the issue a couple of years ago as I
worked on pars of Python's import system.

Quoting Tim Peters: [1]

The Microsoft stat() function is extremely picky about
trailing (back)slashes.  For example, if you have a
directory c:/python, and pass "c:/python/" to the MS stat
(), it claims no such thing exists.  This isn't documented
by MS, but that's how it works:  a trailing (back)slash is
required if and only if the path passed in "is a root".  So
MS stat() doesn't understand "/python/", and doesn't
understand "d:" either.  The former doesn't tolerate a
(back)slash, while the latter requires one.


Christian

[1] http://mail.python.org/pipermail/python-bugs-list/2002-April/011099.html


From googler.1.webmaster at spamgourmet.com  Tue Mar 16 12:08:22 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Tue, 16 Mar 2010 09:08:22 -0700 (PDT)
Subject: C-API PyObject_Call
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
	<mailman.839.1268749506.23598.python-list@python.org>
Message-ID: <92d7720e-b8cc-4f41-8191-17c078911909@m37g2000yqf.googlegroups.com>

But the stack is empty after PyObject_Call, isnt it?


From phlip2005 at gmail.com  Tue Mar 16 12:12:08 2010
From: phlip2005 at gmail.com (Phlip)
Date: Tue, 16 Mar 2010 09:12:08 -0700 (PDT)
Subject: equivalent of Ruby's Pathname?
References: <843d5af9-e8db-4352-a853-4c99664eadf8@k6g2000prg.googlegroups.com>
	<22ac2bce-cf12-45e2-9d89-d7df56a2faa7@b1g2000prc.googlegroups.com> 
	<dcace5fc-5ae9-4756-942d-6da7da2f660d@s36g2000prh.googlegroups.com> 
	<91770e62-2fef-45c9-9e4d-e64088058af1@g8g2000pri.googlegroups.com> 
	<7tceiuF94hU1@mid.individual.net>
	<d871b429-deff-4974-84f3-d5f19c6b9042@u15g2000prd.googlegroups.com>
	<hn6na6$2ci$1@news.eternal-september.org>
	<aabee5b1-5c7d-4248-b096-99b5549c739a@o3g2000yqb.googlegroups.com>
	<mailman.563.1268241310.23598.python-list@python.org>
Message-ID: <7284f1df-100e-4fed-aed2-20b114040d64@v34g2000prm.googlegroups.com>

Chris Rebert wrote:

> The next closest thing would probably be the Python Cookbook:http://code.activestate.com/recipes/langs/python/

One thing I really like about ... my hacked version of path.py ... is
path.cd( lambda: ... ). It works great inside fabfile.py to
temporarily switch to a different folder:

sample_project = path('sample_project').abspath()

def run():
    sample_project.cd( lambda:
        _sh('python manage.py runserver 0.0.0.0:8000 --
settings=test_settings') )

After the lambda runs, we exception-safely return to the home folder.

(BTW I'm aware that a fabfile.py command with only one statement will
return to its shell and remain in the correct folder. It's just ...
the thought!)

This be .cd():

class path:

    def cd(self, block=None):
        previous = path(os.path.curdir).abspath()
        self.chdir()

        if block:
            try:      block()
            finally:  previous.chdir()

That's based on Jason Orendoff's work at http://www.jorendorff.com/articles/python/path

--
  Phlip
  http://c2.com/cgi/wiki?ZeekLand


From stefan_ml at behnel.de  Tue Mar 16 12:17:02 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 16 Mar 2010 17:17:02 +0100
Subject: C-API PyObject_Call
In-Reply-To: <92d7720e-b8cc-4f41-8191-17c078911909@m37g2000yqf.googlegroups.com>
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>	<mailman.839.1268749506.23598.python-list@python.org>
	<92d7720e-b8cc-4f41-8191-17c078911909@m37g2000yqf.googlegroups.com>
Message-ID: <hnoatv$lk6$1@dough.gmane.org>

moerchendiser2k3, 16.03.2010 17:08:
> But the stack is empty after PyObject_Call, isnt it?

I think Steve was expecting that you wanted to debug into your program, 
step into the call, and find the line yourself.

Stefan



From stefan_ml at behnel.de  Tue Mar 16 12:18:01 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 16 Mar 2010 17:18:01 +0100
Subject: C-API PyObject_Call
In-Reply-To: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
Message-ID: <hnoavp$lk6$2@dough.gmane.org>

moerchendiser2k3, 16.03.2010 12:52:
> i have a serious problem and I am looking for a solution. I pass an
> instance of a class from a file to PyObject_Call. When something
> fails, I get a full traceback. If it succeeds, I get the return value.
>
> Is it possible to get information from which line/file the return
> value of PyObject_Call is?

Could you explain what you want to do with this information and in what 
cases you need it? Do you want to extract the information programmatically 
at runtime?

Stefan



From python at hope.cz  Tue Mar 16 12:20:40 2010
From: python at hope.cz (Johny)
Date: Tue, 16 Mar 2010 09:20:40 -0700 (PDT)
Subject: Python bindings tutorial
Message-ID: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>

Is there any tutorial how to write a bindings for a exe ( dos)
program?
I would like to run it from a Python directly
( using import command and a particular function from the binding)
 not using os.system command.
Thanks
L.


From davea at ieee.org  Tue Mar 16 12:23:54 2010
From: davea at ieee.org (Dave Angel)
Date: Tue, 16 Mar 2010 11:23:54 -0500
Subject: How to add a library path to pythonpath ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF684F3C894@enbmail01.lsi.com>
References: <mailman.62.1268737204.24845.python-list@python.org>	<7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>	<1fb1c371003160527q10add6bfk75c09b24bc486329@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C883@enbmail01.lsi.com>
	<4B9F9DD0.2080306@ieee.org>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C894@enbmail01.lsi.com>
Message-ID: <4B9FB09A.7030609@ieee.org>

Barak, Ron wrote:
>   
>> -----Original Message-----
>> From: Dave Angel [mailto:davea at ieee.org]
>> Sent: Tuesday, March 16, 2010 5:04 PM
>> To: Barak, Ron
>> Cc: Pablo Recio Quijano; python-list at python.org
>> Subject: RE: How to add a library path to pythonpath ?
>>
>>
>>
>> Barak, Ron wrote:
>>     
>>> Thanks for the suggestion Pable.
>>>
>>> However, I really need the $PYTHONPATH to include this
>>>       
>> additional library, so all Python scripts could use it.
>>     
>>> In Windows I have defined PYTHONPATH as
>>> c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\, and also in the
>>> Windows registry I have
>>>
>>>
>>>       
>> HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\version\PythonPath\ as
>>     
>> C:\Python26\Lib;C:\Python26\DLLs;C:\views\cc_view\TS_svm_ts_tool\SVMIn
>>     
>>> spector\lib\;C:\Python26\Lib\lib-tk;
>>>
>>> However, even with all the above, the SVMInspecor modules
>>>       
>> are not found.
>>     
>>>       
>> See my response at the end.  Top-posting makes for a very
>> confusing thread.
>>     
>>> <snip>
>>>
>>> 2010/3/16 Barak, Ron <Ron.Barak at lsi.com<mailto:Ron.Barak at lsi.com>>
>>>
>>> Hi,
>>>
>>> I'm trying to add a library path to my pythonpath, but
>>>       
>> seems it is not
>>     
>>> accepted -
>>>
>>> On Windows DOS window:
>>>
>>> C:\>echo %PYTHONPATH%
>>> c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\
>>>
>>> C:\>python -c "import sys ; print sys.path"
>>> ['', 'c:\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
>>> 'C:\\WINDOWS\\syst em32\\python26.zip', 'C:\\Python26\\DLLs',
>>> 'C:\\Python26\\lib', 'C:\\Python26\\l ib\\plat-win',
>>> 'C:\\Python26\\lib\\lib-tk', 'C:\\Python26', 'C:\\Python26\\lib\\
>>> site-packages',
>>> 'C:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
>>>
>>> C:\>
>>>
>>> On Windows cygwin:
>>>
>>> $ echo $PYTHONPATH
>>> .:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
>>>
>>> $ python -c "import sys ; print sys.path"
>>> ['',
>>>
>>>       
>> '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
>>     
>>> 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs',
>>> 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win',
>>> 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26',
>>> 'c:\\Python26\\lib\\site-packages',
>>> 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
>>>
>>> $
>>>
>>> What am I doing wrong ?
>>>
>>> Thanks,
>>> Ron.
>>>
>>>
>>>
>>>       
>> In your original message, what you displayed worked exactly
>> as expected.  As you didn't say what made you think something
>> was wrong, I ignored the message.
>>
>> Now, you say that some modules are not found.  So how about
>> giving some more specifics so someone can actually debug the
>> problem.  Pick a particular module, tell us the complete path
>> to that module, and show us both the sys.path strings (which
>> look correct for the Windows case, and of course bogus for
>> the cygwin case), as well as the offending import statement
>> and its traceback.
>>
>> DaveA
>>     
>
> Hi Dave,
>
> My Python is the Windows Python (I need this for wxPython):
>
> $ ls -ls `which python`
> 1 lrwxrwxrwx 1 rbarak mkgroup-l-d 31 Mar  4 14:02 /usr/bin/python -> /cygdrive/c/Python26/python.exe
>
> Here's a demo script:
>
> #!/usr/bin/env python
>
> import sys
> print "\n",sys.path,"\n"
>
> from ErrorManager.ErrorManager import ErrorManager
>
> And it's run produces:
>
> $ python -u  tmp.py
>
> ['c:\\views\\cc_view\\TS_svm_ts_tool\\svm_ts_tool', '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib', 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs', 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win', 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26', 'c:\\Python26\\lib\\site-packages', 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
>
> Traceback (most recent call last):
>   File "tmp.py", line 6, in <module>
>     from ErrorManager.ErrorManager import ErrorManager
> ImportError: No module named ErrorManager.ErrorManager
>
> $ ls -ls /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/ErrorManager/ErrorManager.py
> 4 -rwxr-xr-x 1 rbarak ???????? 1843 Sep 21 19:16 /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/ErrorManager/ErrorManager.py
>
> $ grep ErrorManager  /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
> ErrorManager/ErrorManager.py
> class ErrorManager:
>
> $ echo $PYTHONPATH
> .:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
>
> Please let me know if the above is enough, or you'd like to see the results from a Windows' DOS window.
>
> Thanks,
> Ron.
>
>   
Well, I pointed out that your cygwin path is bogus, so of course it 
won't work.  One of those entries is

    '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib'

I use Linux, and I use Windows.  But cygwin's glomming together has 
never made sense;  some things are Unix-like, and others are 
Windows-like.  So anything you do in that environment is beyond me.

If I had to guess, though I'd say you wanted to drop those first two 
characters from your PYTHONPATH.  If you really wanted two directories 
there, you should be separating them with semicolon (Windows rules), 
rather than colon (Linux rules).  First thing I'd do to test my theories 
is to print something like:
     print sys.path[1]
     print os.listdir(sys.path[1])
Does Python even see the cygwin view of the world ?

You also don't show the location of the module you're trying to import.  
I'm guessing that it's at ...SVMInspector/lib/ErrorManager/ErrorManager.py
Do you have a file     ...SVMInspector/lib/ErrorManager/__init__.py     ?

I would seriously recommend against naming your package, your module, 
and your class all the same thing.  Makes debugging very hard.  At least 
make them have different case combinations.

DaveA



From s.selvamsiva at gmail.com  Tue Mar 16 12:31:25 2010
From: s.selvamsiva at gmail.com (S.Selvam)
Date: Tue, 16 Mar 2010 22:01:25 +0530
Subject: web sound recording with python
In-Reply-To: <4acee8d1$0$919$ba4acef3@news.orange.fr>
References: <7676a0f3-5126-4930-af07-0b3cb737dffc@m33g2000pri.googlegroups.com>
	<4acee8d1$0$919$ba4acef3@news.orange.fr>
Message-ID: <b423b9551003160931j13e75163k8bc8aef847f05c46@mail.gmail.com>

On Fri, Oct 9, 2009 at 1:10 PM, Michel Claveau - MVP
<enleverLesX_XXmcX at xmclavxeaux.com.invalid> wrote:

> Hi!
>
> On windows, you can record sound who play on the local sound-card.
> It is not really Python scripting, but Python can launch it.
>

Does python do not have support for voice recording ?


-- 
Regards,
S.Selvam

  " I am because we are "
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From dmj.ccc at gmail.com  Tue Mar 16 12:31:36 2010
From: dmj.ccc at gmail.com (david jensen)
Date: Tue, 16 Mar 2010 09:31:36 -0700 (PDT)
Subject: Searching for most pythonic/least stupid way to do something 
	simple
References: <d62c4091-e0f0-4195-9b0e-dd597f9d0131@u9g2000yqb.googlegroups.com>
	<7xmxy87172.fsf@ruckus.brouhaha.com>
Message-ID: <2c39f6d4-3118-43f3-907d-57f733dc7ed8@d27g2000yqf.googlegroups.com>

Thanks Paul, but i don't immediately see how that helps (maybe I'm
just being dense)... nn's solution, though i initially thought it
worked, actually has a similar problem:

intended:
>>> print getOutcomes([3,4,5,5])
[[6, 1, 5, 5], [4.5, 2.5, 5, 5], [3, 4, 5, 5], [1.5, 5.5, 5, 5], [0,
7, 5, 5]]
>>> print getOutcomes([4,3,5,5])
[[7, 0, 5, 5], [5.5, 1.5, 5, 5], [4, 3, 5, 5], [2.5, 4.5, 5, 5], [1,
6, 5, 5]]

nn's solution:
>>> print getOutcomesNN([4,3,5,5])
[[6.0, 1.0, 5, 5], [4.5, 2.5, 5, 5], [3.0, 4.0, 5, 5], [1.5, 5.5, 5,
5], [0.0, 7.0, 5, 5]]


it's obvious why this is happening (the list comprehension assumes
that index 0 is, after all, index 0), but not immediately obvious how
to fix it, except by going with gerard's solution or doing what i did
in the beginning: flip them if they're in the wrong order, remember,
and flip them again at the end.

dmj


From googler.1.webmaster at spamgourmet.com  Tue Mar 16 12:41:16 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Tue, 16 Mar 2010 09:41:16 -0700 (PDT)
Subject: C-API PyObject_Call
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
	<mailman.849.1268756405.23598.python-list@python.org>
Message-ID: <3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>

In one case I have to check the return value of PyObject_Call, and if
its not of the correct return value,
I throw an exception, but I just get a simple output:

TypeError: Expected an instance of XYZ, no int.

instead of

Traceback (most called...)
TypeError: in line 3, file test.py: expected an instance of XYZ, no
int...


From jackdied at gmail.com  Tue Mar 16 12:49:59 2010
From: jackdied at gmail.com (Jack Diederich)
Date: Tue, 16 Mar 2010 12:49:59 -0400
Subject: Dynamic Class Creation
In-Reply-To: <50697b2c1003152318t7b9cd692pcf11ca45bbe1f041@mail.gmail.com>
References: <b05e819c-a005-49d4-b0e7-78be9a56b268@q2g2000pre.googlegroups.com>
	<50697b2c1003152318t7b9cd692pcf11ca45bbe1f041@mail.gmail.com>
Message-ID: <b8e622741003160949s3c8e34dfr407a79908b6dbfd0@mail.gmail.com>

On Tue, Mar 16, 2010 at 2:18 AM, Chris Rebert <clp2 at rebertia.com> wrote:
> On Mon, Mar 15, 2010 at 11:01 PM, Josh English
> <joshua.r.english at gmail.com> wrote:
>> I have a large program with lots of data stored in XML. I'm upgrading
>> my GUI to use ObjectListView, but with my data in XML, I don't have
>> regular objects to interact with the OLV. I do have an XML validator
>> that defines the structure of the XML elements, and I'm trying to
>> dynamically create a class to wrap the XML element.
>>
>> So, an element like:
>>
>> <market code="WotF">
>> <title>Writers of the Future</title>
>> </market>
>>
>> I want to create a class like:
>>
>> class Market(object):
>> ? ?def __init__(self, elem):
>> ? ? ? ?self._elem = elem
>>
>> ? ?def get_code(self):
>> ? ? ? ?return self._elem.get('code')
>>
>> ? ?def set_code(self, value):
>> ? ? ? ?self._elem.set('code', value)
>>
>> ? ?def get_title(self):
>> ? ? ? ?return self._elem.find('title').text
>>
>> ? ?def set_title(self, value):
>> ? ? ? ?node = self._elem.find('title')
>> ? ? ? ?node.text = value
>>
>> Naturally, I don't want to hand code this for every interface but
>> would like to create them dynamically. (The laziness of programming, I
>> guess.)
>>
>> What's the best way to create these helper methods?

You can either define a catch-all __getattr__ method to look them up
dynamically, or as Chris kinda-suggested write descriptors for the
individual elements.

class Market():
  def __init__(self, elem):
    self._elem = elem
  def __getattr__(self, name):
    try:
      # I'm assuming this raises a KeyError when not found
      return self._elem.get(name)
    except KeyError:
      return self._elem.find(name)
  def __setitem__(self, name, value):
     # like __getitem__ but for setting

Chris' property maker function is almost like a descriptor class (how
properties are implemented under the hood), here's a refactoring
[untested]

class ElemGetProperty():
    def __init__(self, name):
      self.name = name
    def __get__(self, ob, cls):
      return ob._elem.get(self.name)
    def __set__(self, ob, val):
       ob._elem.set(self.name, val)

You could write one property class for each kind of element (get/find)
and then put them in your class like this

class Market():
    code = ElemGetProperty('code')
    title = ElemFindProeprty('title')

The getattr/setattr method is easier to understand and will handle
arbitrary elements;  for the descriptors version you'll have to define
one for each tag that might be used on the class.

-Jack


From clp2 at rebertia.com  Tue Mar 16 12:53:37 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 16 Mar 2010 09:53:37 -0700
Subject: Dynamic Class Creation
In-Reply-To: <b8e622741003160949s3c8e34dfr407a79908b6dbfd0@mail.gmail.com>
References: <b05e819c-a005-49d4-b0e7-78be9a56b268@q2g2000pre.googlegroups.com>
	<50697b2c1003152318t7b9cd692pcf11ca45bbe1f041@mail.gmail.com>
	<b8e622741003160949s3c8e34dfr407a79908b6dbfd0@mail.gmail.com>
Message-ID: <50697b2c1003160953l209c21ddm5b9c0d960a6f2@mail.gmail.com>

On Tue, Mar 16, 2010 at 9:49 AM, Jack Diederich <jackdied at gmail.com> wrote:
> On Tue, Mar 16, 2010 at 2:18 AM, Chris Rebert <clp2 at rebertia.com> wrote:
>> On Mon, Mar 15, 2010 at 11:01 PM, Josh English
>> <joshua.r.english at gmail.com> wrote:
<snip>
>>> What's the best way to create these helper methods?
>
> You can either define a catch-all __getattr__ method to look them up
> dynamically, or as Chris kinda-suggested write descriptors for the
> individual elements.
>
> class Market():
> ?def __init__(self, elem):
> ? ?self._elem = elem
> ?def __getattr__(self, name):
> ? ?try:
> ? ? ?# I'm assuming this raises a KeyError when not found
> ? ? ?return self._elem.get(name)
> ? ?except KeyError:
> ? ? ?return self._elem.find(name)
> ?def __setitem__(self, name, value):

did you mean __setattr__ here?

<snip>
> The getattr/setattr method is easier to understand and will handle
> arbitrary elements; ?for the descriptors version you'll have to define
> one for each tag that might be used on the class.

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


From dmj.ccc at gmail.com  Tue Mar 16 12:54:57 2010
From: dmj.ccc at gmail.com (david jensen)
Date: Tue, 16 Mar 2010 09:54:57 -0700 (PDT)
Subject: Searching for most pythonic/least stupid way to do something 
	simple
References: <d62c4091-e0f0-4195-9b0e-dd597f9d0131@u9g2000yqb.googlegroups.com>
	<7xmxy87172.fsf@ruckus.brouhaha.com>
	<2c39f6d4-3118-43f3-907d-57f733dc7ed8@d27g2000yqf.googlegroups.com>
Message-ID: <288bfc27-0c5b-4601-9ceb-dd2614593fb9@m37g2000yqf.googlegroups.com>

of course, changing nn's to:
def getOutcomes(myList=[2,5,8,3,5]):
   low_id = int(myList[0]>myList[1])
   amountToShare = 2*myList[low_id]
   remainder = myList[not low_id]-myList[low_id]
   tail=list(myList[2:])
   outcomes = [[amountToShare*perc, remainder+amountToShare*(1-perc)]+
tail for perc in (1.0, 0.75, 0.5, 0.25, 0.0)] if not low_id else
[[remainder+amountToShare*perc, amountToShare*(1-perc)]+ tail for perc
in (1.0, 0.75, 0.5, 0.25, 0.0)]
   return outcomes


works, just hides the ugliness in a more compact form


From martin.schmidt1 at gmail.com  Tue Mar 16 12:56:15 2010
From: martin.schmidt1 at gmail.com (Martin Schmidt)
Date: Tue, 16 Mar 2010 11:56:15 -0500
Subject: Python-list Digest, Vol 78, Issue 161
In-Reply-To: <mailman.3920.1268726105.23597.python-list@python.org>
References: <mailman.3920.1268726105.23597.python-list@python.org>
Message-ID: <5444f9711003160956l316a07dfs89f4f418e7528f20@mail.gmail.com>

Thanks, Stefan.
Actually I will have to run the searches I am interested in only a few times
and therefore will drop performance concerns.

Thanks for len(text.split()) .
I will try it later.

The text I am interested in is always in leaf elements.

I have posted a concrete example incl. a representative XML file a few
minutes ago.
I hope this clarifies my problem.

Rereading what I wrote sounds admittedly funnny.
What I meant that I did not find a post that closely matches my problem (I
know that the closeness needed in my case will seem excessive to more
experienced Python/XML users).

Best regards.

  Martin


P.S. Sorry for my late reply, but my Internet connection was down for a day.




> ---------- Forwarded message ----------
> From: Stefan Behnel <stefan_ml at behnel.de>
> To: python-list at python.org
> Date: Tue, 16 Mar 2010 08:50:30 +0100
> Subject: Re: extract occurrence of regular expression from elements of XML
> documents
> Martin Schmidt, 15.03.2010 18:16:
>
>> I have just started to use Python a few weeks ago and until last week I
>> had
>> no knowledge of XML.
>> Obviously my programming knowledge is pretty basic.
>> Now I would like to use Python in combination with ca. 2000 XML documents
>> (about 30 kb each) to search for certain regular expression within
>> specific
>> elements of these documents.
>>
>
> 2000 * 30K isn't a huge problem, that's just 60M in total. If you just have
> to do it once, drop your performance concerns and just get a solution going.
> If you have to do it once a day, take care to use a tool that is not too
> resource consuming. If you have strict requirements to do it once a minute,
> use a fast machine with a couple of cores and do it in parallel. If you have
> a huge request workload and want to reverse index the XML to do all sorts of
> sophisticated queries on it, use a database instead.
>
>
>  I would then like to record the number of occurrences of the regular
>> expression within these elements.
>> Moreover I would like to count the total number of words contained within
>> these,
>>
>
> len(text.split()) will give you those.
>
> BTW, is it document-style XML (with mixed content as in HTML) or is the
> text always withing a leaf element?
>
>
>  and record the attribute of a higher level element that contains
>> them.
>>
>
> An example would certainly help here.
>
>
>  I was trying to figure out the best way how to do this, but got
>> overwhelmed
>> by the available information (e.g. posts using different approaches based
>> on
>> dom, sax, xpath, elementtree, expat).
>> The outcome should be a file that lists the extracted attribute, the
>> number
>> of occurrences of the regular expression, and the total number of words.
>> I did not find a post that addresses my problem.
>>
>
> Funny that you say that after stating that you were overwhelmed by the
> available information.
>
>
>  If someone could help me with this I would really appreciate it.
>>
>
> Most likely, the solution with the best simplicity/performance trade-off
> would be xml.etree.cElementTree's iterparse(), intercept on each interesting
> tag name, and search its text/tail using the regexp. That's doable in a
> couple of lines.
>
> But unless you provide more information, it's hard to give better advice.
>
> Stefan
>
>
>
>
> ---------- Forwarded message ----------
> From: Chris Rebert <clp2 at rebertia.com>
> To: "Lawrence D'Oliveiro" <ldo at geek-central.gen.nz>
> Date: Tue, 16 Mar 2010 00:52:07 -0700
> Subject: Re: import antigravity
> On Tue, Mar 16, 2010 at 12:40 AM, Lawrence D'Oliveiro
> <ldo at geek-central.gen.new_zealand> wrote:
> > Subtle...
>
> You're a bit behind the times.
> If my calculations are right, that comic is over 2 years old.
>
> Cheers,
> Chris
>
>
>
> ---------- Forwarded message ----------
> From: Stefan Behnel <stefan_ml at behnel.de>
> To: python-list at python.org
> Date: Tue, 16 Mar 2010 08:51:58 +0100
> Subject: Re: import antigravity
> Lawrence D'Oliveiro, 16.03.2010 08:40:
>
>> Subtle...
>>
>
> Absolutely.
>
>  Python 2.4.6 (#2, Jan 21 2010, 23:45:25)
>  [GCC 4.4.1] on linux2
>  Type "help", "copyright", "credits" or "license" for more information.
>  >>> import antigravity
>  Traceback (most recent call last):
>    File "<stdin>", line 1, in ?
>  ImportError: No module named antigravity
>
>
> Stefan
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From steve at holdenweb.com  Tue Mar 16 12:56:21 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 16 Mar 2010 12:56:21 -0400
Subject: How to add a library path to pythonpath ?
In-Reply-To: <4B9FB09A.7030609@ieee.org>
References: <mailman.62.1268737204.24845.python-list@python.org>	<7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>	<1fb1c371003160527q10add6bfk75c09b24bc486329@mail.gmail.com>	<7F0503CD69378F49BE0DC30661C6CCF684F3C883@enbmail01.lsi.com>	<4B9F9DD0.2080306@ieee.org>	<7F0503CD69378F49BE0DC30661C6CCF684F3C894@enbmail01.lsi.com>
	<4B9FB09A.7030609@ieee.org>
Message-ID: <hnod7s$ur9$1@dough.gmane.org>

Dave Angel wrote:
> Barak, Ron wrote:
>>  
>>> -----Original Message-----
>>> From: Dave Angel [mailto:davea at ieee.org]
>>> Sent: Tuesday, March 16, 2010 5:04 PM
>>> To: Barak, Ron
>>> Cc: Pablo Recio Quijano; python-list at python.org
>>> Subject: RE: How to add a library path to pythonpath ?
>>>
>>>
>>>
>>> Barak, Ron wrote:
>>>    
>>>> Thanks for the suggestion Pable.
>>>>
>>>> However, I really need the $PYTHONPATH to include this
>>>>       
>>> additional library, so all Python scripts could use it.
>>>    
>>>> In Windows I have defined PYTHONPATH as
>>>> c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\, and also in the
>>>> Windows registry I have
>>>>
>>>>
>>>>       
>>> HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\version\PythonPath\ as
>>>    
>>> C:\Python26\Lib;C:\Python26\DLLs;C:\views\cc_view\TS_svm_ts_tool\SVMIn
>>>    
>>>> spector\lib\;C:\Python26\Lib\lib-tk;
>>>>
>>>> However, even with all the above, the SVMInspecor modules
>>>>       
>>> are not found.
>>>    
>>>>       
>>> See my response at the end.  Top-posting makes for a very
>>> confusing thread.
>>>    
>>>> <snip>
>>>>
>>>> 2010/3/16 Barak, Ron <Ron.Barak at lsi.com<mailto:Ron.Barak at lsi.com>>
>>>>
>>>> Hi,
>>>>
>>>> I'm trying to add a library path to my pythonpath, but
>>>>       
>>> seems it is not
>>>    
>>>> accepted -
>>>>
>>>> On Windows DOS window:
>>>>
>>>> C:\>echo %PYTHONPATH%
>>>> c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\
>>>>
>>>> C:\>python -c "import sys ; print sys.path"
>>>> ['', 'c:\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
>>>> 'C:\\WINDOWS\\syst em32\\python26.zip', 'C:\\Python26\\DLLs',
>>>> 'C:\\Python26\\lib', 'C:\\Python26\\l ib\\plat-win',
>>>> 'C:\\Python26\\lib\\lib-tk', 'C:\\Python26', 'C:\\Python26\\lib\\
>>>> site-packages',
>>>> 'C:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
>>>>
>>>> C:\>
>>>>
>>>> On Windows cygwin:
>>>>
>>>> $ echo $PYTHONPATH
>>>> .:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
>>>>
>>>> $ python -c "import sys ; print sys.path"
>>>> ['',
>>>>
>>>>       
>>> '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
>>>    
>>>> 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs',
>>>> 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win',
>>>> 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26',
>>>> 'c:\\Python26\\lib\\site-packages',
>>>> 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
>>>>
>>>> $
>>>>
>>>> What am I doing wrong ?
>>>>
>>>> Thanks,
>>>> Ron.
>>>>
>>>>
>>>>
>>>>       
>>> In your original message, what you displayed worked exactly
>>> as expected.  As you didn't say what made you think something
>>> was wrong, I ignored the message.
>>>
>>> Now, you say that some modules are not found.  So how about
>>> giving some more specifics so someone can actually debug the
>>> problem.  Pick a particular module, tell us the complete path
>>> to that module, and show us both the sys.path strings (which
>>> look correct for the Windows case, and of course bogus for
>>> the cygwin case), as well as the offending import statement
>>> and its traceback.
>>>
>>> DaveA
>>>     
>>
>> Hi Dave,
>>
>> My Python is the Windows Python (I need this for wxPython):
>>
>> $ ls -ls `which python`
>> 1 lrwxrwxrwx 1 rbarak mkgroup-l-d 31 Mar  4 14:02 /usr/bin/python ->
>> /cygdrive/c/Python26/python.exe
>>
>> Here's a demo script:
>>
>> #!/usr/bin/env python
>>
>> import sys
>> print "\n",sys.path,"\n"
>>
>> from ErrorManager.ErrorManager import ErrorManager
>>
>> And it's run produces:
>>
>> $ python -u  tmp.py
>>
>> ['c:\\views\\cc_view\\TS_svm_ts_tool\\svm_ts_tool',
>> '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
>> 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs',
>> 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win',
>> 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26',
>> 'c:\\Python26\\lib\\site-packages',
>> 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
>>
>> Traceback (most recent call last):
>>   File "tmp.py", line 6, in <module>
>>     from ErrorManager.ErrorManager import ErrorManager
>> ImportError: No module named ErrorManager.ErrorManager
>>
>> $ ls -ls
>> /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/ErrorManager/ErrorManager.py
>>
>> 4 -rwxr-xr-x 1 rbarak ???????? 1843 Sep 21 19:16
>> /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/ErrorManager/ErrorManager.py
>>
>>
>> $ grep ErrorManager 
>> /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
>> ErrorManager/ErrorManager.py
>> class ErrorManager:
>>
>> $ echo $PYTHONPATH
>> .:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
>>
>> Please let me know if the above is enough, or you'd like to see the
>> results from a Windows' DOS window.
>>
>> Thanks,
>> Ron.
>>
>>   
> Well, I pointed out that your cygwin path is bogus, so of course it
> won't work.  One of those entries is
> 
>    '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib'
> 
> I use Linux, and I use Windows.  But cygwin's glomming together has
> never made sense;  some things are Unix-like, and others are
> Windows-like.  So anything you do in that environment is beyond me.
> 
> If I had to guess, though I'd say you wanted to drop those first two
> characters from your PYTHONPATH.  If you really wanted two directories
> there, you should be separating them with semicolon (Windows rules),
> rather than colon (Linux rules).  First thing I'd do to test my theories
> is to print something like:
>     print sys.path[1]
>     print os.listdir(sys.path[1])
> Does Python even see the cygwin view of the world ?
> 
> You also don't show the location of the module you're trying to import. 
> I'm guessing that it's at ...SVMInspector/lib/ErrorManager/ErrorManager.py
> Do you have a file     ...SVMInspector/lib/ErrorManager/__init__.py     ?
> 
> I would seriously recommend against naming your package, your module,
> and your class all the same thing.  Makes debugging very hard.  At least
> make them have different case combinations.
> 
In point of fact the mistake that's happening here is running the
Windows Python under Cygwin and expecting it to make sense.

Just because you run the Windows Python interpreter under Windows
doesn't make it magically capable of understanding a Cygwin path
specification.

We have yet to hear why the Cygwin Python isn't acceptable (though one
reason might be the unavailability of 2.6).

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From martin.schmidt1 at gmail.com  Tue Mar 16 12:58:00 2010
From: martin.schmidt1 at gmail.com (Martin Schmidt)
Date: Tue, 16 Mar 2010 11:58:00 -0500
Subject: extract occurrence of regular expression from elements of XML 
	documents
Message-ID: <5444f9711003160958h6514141amcfa12fa4233c4c67@mail.gmail.com>

On Tue, Mar 16, 2010 at 11:56 AM, Martin Schmidt
<martin.schmidt1 at gmail.com>wrote:

> Thanks, Stefan.
> Actually I will have to run the searches I am interested in only a few
> times and therefore will drop performance concerns.
>
> Thanks for len(text.split()) .
> I will try it later.
>
> The text I am interested in is always in leaf elements.
>
> I have posted a concrete example incl. a representative XML file a few
> minutes ago.
> I hope this clarifies my problem.
>
> Rereading what I wrote sounds admittedly funnny.
> What I meant that I did not find a post that closely matches my problem (I
> know that the closeness needed in my case will seem excessive to more
> experienced Python/XML users).
>
> Best regards.
>
>   Martin
>
>
> P.S. Sorry for my late reply, but my Internet connection was down for a
> day.
>
>
>
>
>> ---------- Forwarded message ----------
>> From: Stefan Behnel <stefan_ml at behnel.de>
>> To: python-list at python.org
>> Date: Tue, 16 Mar 2010 08:50:30 +0100
>> Subject: Re: extract occurrence of regular expression from elements of XML
>> documents
>> Martin Schmidt, 15.03.2010 18:16:
>>
>>> I have just started to use Python a few weeks ago and until last week I
>>> had
>>> no knowledge of XML.
>>> Obviously my programming knowledge is pretty basic.
>>> Now I would like to use Python in combination with ca. 2000 XML documents
>>> (about 30 kb each) to search for certain regular expression within
>>> specific
>>> elements of these documents.
>>>
>>
>> 2000 * 30K isn't a huge problem, that's just 60M in total. If you just
>> have to do it once, drop your performance concerns and just get a solution
>> going. If you have to do it once a day, take care to use a tool that is not
>> too resource consuming. If you have strict requirements to do it once a
>> minute, use a fast machine with a couple of cores and do it in parallel. If
>> you have a huge request workload and want to reverse index the XML to do all
>> sorts of sophisticated queries on it, use a database instead.
>>
>>
>>  I would then like to record the number of occurrences of the regular
>>> expression within these elements.
>>> Moreover I would like to count the total number of words contained within
>>> these,
>>>
>>
>> len(text.split()) will give you those.
>>
>> BTW, is it document-style XML (with mixed content as in HTML) or is the
>> text always withing a leaf element?
>>
>>
>>  and record the attribute of a higher level element that contains
>>> them.
>>>
>>
>> An example would certainly help here.
>>
>>
>>  I was trying to figure out the best way how to do this, but got
>>> overwhelmed
>>> by the available information (e.g. posts using different approaches based
>>> on
>>> dom, sax, xpath, elementtree, expat).
>>> The outcome should be a file that lists the extracted attribute, the
>>> number
>>> of occurrences of the regular expression, and the total number of words.
>>> I did not find a post that addresses my problem.
>>>
>>
>> Funny that you say that after stating that you were overwhelmed by the
>> available information.
>>
>>
>>  If someone could help me with this I would really appreciate it.
>>>
>>
>> Most likely, the solution with the best simplicity/performance trade-off
>> would be xml.etree.cElementTree's iterparse(), intercept on each interesting
>> tag name, and search its text/tail using the regexp. That's doable in a
>> couple of lines.
>>
>> But unless you provide more information, it's hard to give better advice.
>>
>> Stefan
>>
>>
>>
>>
>> ---------- Forwarded message ----------
>> From: Chris Rebert <clp2 at rebertia.com>
>> To: "Lawrence D'Oliveiro" <ldo at geek-central.gen.nz>
>> Date: Tue, 16 Mar 2010 00:52:07 -0700
>> Subject: Re: import antigravity
>> On Tue, Mar 16, 2010 at 12:40 AM, Lawrence D'Oliveiro
>> <ldo at geek-central.gen.new_zealand> wrote:
>> > Subtle...
>>
>> You're a bit behind the times.
>> If my calculations are right, that comic is over 2 years old.
>>
>> Cheers,
>> Chris
>>
>>
>>
>> ---------- Forwarded message ----------
>> From: Stefan Behnel <stefan_ml at behnel.de>
>> To: python-list at python.org
>> Date: Tue, 16 Mar 2010 08:51:58 +0100
>> Subject: Re: import antigravity
>> Lawrence D'Oliveiro, 16.03.2010 08:40:
>>
>>> Subtle...
>>>
>>
>> Absolutely.
>>
>>  Python 2.4.6 (#2, Jan 21 2010, 23:45:25)
>>  [GCC 4.4.1] on linux2
>>  Type "help", "copyright", "credits" or "license" for more information.
>>  >>> import antigravity
>>  Traceback (most recent call last):
>>    File "<stdin>", line 1, in ?
>>  ImportError: No module named antigravity
>>
>>
>> Stefan
>>
>>
>>
>> --
>>
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
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From steve at holdenweb.com  Tue Mar 16 13:00:36 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 16 Mar 2010 13:00:36 -0400
Subject: equivalent of Ruby's Pathname?
In-Reply-To: <7284f1df-100e-4fed-aed2-20b114040d64@v34g2000prm.googlegroups.com>
References: <843d5af9-e8db-4352-a853-4c99664eadf8@k6g2000prg.googlegroups.com>	<22ac2bce-cf12-45e2-9d89-d7df56a2faa7@b1g2000prc.googlegroups.com>
	<dcace5fc-5ae9-4756-942d-6da7da2f660d@s36g2000prh.googlegroups.com>
	<91770e62-2fef-45c9-9e4d-e64088058af1@g8g2000pri.googlegroups.com>
	<7tceiuF94hU1@mid.individual.net>	<d871b429-deff-4974-84f3-d5f19c6b9042@u15g2000prd.googlegroups.com>	<hn6na6$2ci$1@news.eternal-september.org>	<aabee5b1-5c7d-4248-b096-99b5549c739a@o3g2000yqb.googlegroups.com>	<mailman.563.1268241310.23598.python-list@python.org>
	<7284f1df-100e-4fed-aed2-20b114040d64@v34g2000prm.googlegroups.com>
Message-ID: <hnodfq$ur9$2@dough.gmane.org>

Phlip wrote:
> Chris Rebert wrote:
> 
>> The next closest thing would probably be the Python Cookbook:http://code.activestate.com/recipes/langs/python/
> 
> One thing I really like about ... my hacked version of path.py ... is
> path.cd( lambda: ... ). It works great inside fabfile.py to
> temporarily switch to a different folder:
> 
> sample_project = path('sample_project').abspath()
> 
> def run():
>     sample_project.cd( lambda:
>         _sh('python manage.py runserver 0.0.0.0:8000 --
> settings=test_settings') )
> 
> After the lambda runs, we exception-safely return to the home folder.
> 
> (BTW I'm aware that a fabfile.py command with only one statement will
> return to its shell and remain in the correct folder. It's just ...
> the thought!)
> 
> This be .cd():
> 
> class path:
> 
>     def cd(self, block=None):
>         previous = path(os.path.curdir).abspath()
>         self.chdir()
> 
>         if block:
>             try:      block()
>             finally:  previous.chdir()
> 
> That's based on Jason Orendoff's work at http://www.jorendorff.com/articles/python/path
> 
Wouldn't this be better written as a context manager?

Be aware also that this won't work well in a multi-threaded environment
(assuming os.path.chdir is ultimately used to change directories)
because it effects the process's (globaL current directory.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From mail.to.daniel.platz at googlemail.com  Tue Mar 16 13:10:16 2010
From: mail.to.daniel.platz at googlemail.com (Daniel Platz)
Date: Tue, 16 Mar 2010 10:10:16 -0700 (PDT)
Subject: passing a socket to a subprocess in windows
Message-ID: <e776af95-e028-47a4-ba42-eda558660a30@e1g2000yqh.googlegroups.com>

Hello!

I have a problem with passing a socket to a subprocess in windows. It
works in Linux and for windows there is a workaround in the Python
doc. However, this workaround does not work. It was already noted by
other people and they Python issue tracker

http://bugs.python.org/issue5879
***************************************************************************************************************
the example from

http://docs.python.org/library/multiprocessing.html?highlight=multiprocessing#module-multiprocessing

named "
# Example where a pool of http servers share a single listening socket
#
"
does not work on windows.

Reason:

s = socket.fromfd(fd, family, type_, proto)

in line 156 of reduction.py

fails, because fromfd is not available on windows. Sad thing:
reduction.py was put into processing.py exactly to solve that problem
(i.e. reduction.py is provided as workaround for socket.fromfd not
available on windows, from the documentation:
if sys.platform == 'win32':
    import multiprocessing.reduction
    # make sockets pickable/inheritable


the solution within processing was:

try:
    fromfd = socket.fromfd
except AttributeError:
    def fromfd(fd, family, type, proto=0):
        s = socket._socket.socket()
        _processing.changeFd(s, fd, family, type, proto)
        return s

but: _multiprocessing has no longer a method changeFd.

Harald
***********************************************************************************************************************

Has someone information about this or can help me to solve the
problem.

Thanks in advance

Daniel


From steve at holdenweb.com  Tue Mar 16 13:14:04 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 16 Mar 2010 13:14:04 -0400
Subject: C-API PyObject_Call
In-Reply-To: <3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>	<mailman.849.1268756405.23598.python-list@python.org>
	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>
Message-ID: <hnoe93$3k8$1@dough.gmane.org>

moerchendiser2k3 wrote:
> In one case I have to check the return value of PyObject_Call, and if
> its not of the correct return value,
> I throw an exception, but I just get a simple output:
> 
> TypeError: Expected an instance of XYZ, no int.
> 
> instead of
> 
> Traceback (most called...)
> TypeError: in line 3, file test.py: expected an instance of XYZ, no
> int...

Could we perhaps see a little bit more of the code? Are you throwing the
exception from within your C code or from the Python calling environment
with a raise statement?

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From python at bdurham.com  Tue Mar 16 13:18:15 2010
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 16 Mar 2010 13:18:15 -0400
Subject: Converting Python CGI to WSGI scripts
Message-ID: <1268759895.28810.1365130739@webmail.messagingengine.com>

I have a few dozen simple Python CGI scripts.

Are there any advantages or disadvantages to rewriting these CGI
scripts as WSGI scripts?

Apologies if my terminology is not correct ... when I say WSGI
scripts I mean standalone scripts like the following simplified
(as an example) template:

import sys
def application(environ, start_response):
    output = 'Welcome to your mod_wsgi website! It
uses:\n\nPython %s' % sys.version
    response_headers = [
        ('Content-Length', str(len(output))),
        ('Content-Type', 'text/plain'),
    ]
    start_response('200 OK', response_headers)
    return [output]

When I say script I don't mean classic WSGI application in the
sense of a .serve_forever() loop coordinating a bunch of related
scripts - I mean individual, standalone scripts.

Hope this makes sense :)

Thank you,
Malcolm
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From gatoygata2 at gmail.com  Tue Mar 16 14:13:40 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Tue, 16 Mar 2010 11:13:40 -0700 (PDT)
Subject: Python bindings tutorial
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>
Message-ID: <168167cf-c153-4e2b-8bca-5b9ae7afd67d@t23g2000yqt.googlegroups.com>

On Mar 16, 5:20?pm, Johny <pyt... at hope.cz> wrote:
> Is there any tutorial how to write a bindings for a exe ( dos)
> program?
> I would like to run it from a Python directly
> ( using import command and a particular function from the binding)
> ?not using os.system command.
> Thanks
> L.

subprocess ?


From gatoygata2 at gmail.com  Tue Mar 16 14:14:50 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Tue, 16 Mar 2010 11:14:50 -0700 (PDT)
Subject: Python bindings tutorial
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>
Message-ID: <92fa9d1d-d5a3-46b5-947b-12a0f338ee7e@t41g2000yqt.googlegroups.com>

On Mar 16, 5:20?pm, Johny <pyt... at hope.cz> wrote:
> Is there any tutorial how to write a bindings for a exe ( dos)
> program?
> I would like to run it from a Python directly
> ( using import command and a particular function from the binding)
> ?not using os.system command.
> Thanks
> L.

subprocess ?


From googler.1.webmaster at spamgourmet.com  Tue Mar 16 14:25:25 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Tue, 16 Mar 2010 11:25:25 -0700 (PDT)
Subject: C-API PyObject_Call
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
	<mailman.849.1268756405.23598.python-list@python.org>
	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>
	<mailman.858.1268759662.23598.python-list@python.org>
Message-ID: <c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>

Hi, currently I am not at home, I will post some stuff when I am back.
Just the note: I throw an exception with the C API.

Looks like that


PyObject *result = PyObject_Call(my_isntance, "", NULL);
if(result==NULL)
{
    PyErr_Print(); //when this happens, the traceback is correct with
information about the file/line
    return;
}

if(!PyXYZ_Check(result))
{
    PyErr_SetString(PyExc_TypeError, "Wrong type, ....");
    PyErr_Print(); //missing information of the file/line.
    return;
}

Well, I expect, that there are no information about the line/file, so
I know something is missing, but what is missing?

Bye, moerchendiser2k3


From twistedphrame at gmail.com  Tue Mar 16 14:56:30 2010
From: twistedphrame at gmail.com (Jordan Apgar)
Date: Tue, 16 Mar 2010 11:56:30 -0700 (PDT)
Subject: datetime string conversion error
Message-ID: <8cebc349-33d5-4820-a944-2e6869408f0f@c34g2000pri.googlegroups.com>

Hey all,
I'm trying to convert a string to a date time object and all my fields
convert except for month which seems to default to january.

here's what I'm doing:
date = "2010-03-16 14:46:38.409137"
 olddate = datetime.strptime(date,"%Y-%m-%j %H:%M:%S.%f")

print date
print olddate

I get:
2010-03-16 14:46:38.409137
2010-01-16 14:46:38.409137

notice the 01 in the second date from what I could tell everything is
formatted correctly.

thanks for the help.
~Jordan


From tack at urandom.ca  Tue Mar 16 14:59:00 2010
From: tack at urandom.ca (Jason Tackaberry)
Date: Tue, 16 Mar 2010 14:59:00 -0400
Subject: to pass self or not to pass self
In-Reply-To: <4b9f4984$0$10229$426a74cc@news.free.fr>
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
Message-ID: <1268765940.6473.13.camel@arrakis>

On Tue, 2010-03-16 at 10:04 +0100, Bruno Desthuilliers wrote:
> Answer here:
> 
> http://wiki.python.org/moin/FromFunctionToMethod

I have a sense I used to know this once upon a time, but the question
came to my mind (possibly again) and I couldn't think of an answer:

Why not create the bound methods at instantiation time, rather than
using the descriptor protocol which has the overhead of creating a new
bound method each time the method attribute is accessed?

Cheers,
Jason.




From lists at cheimes.de  Tue Mar 16 15:07:32 2010
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 16 Mar 2010 20:07:32 +0100
Subject: datetime string conversion error
In-Reply-To: <8cebc349-33d5-4820-a944-2e6869408f0f@c34g2000pri.googlegroups.com>
References: <8cebc349-33d5-4820-a944-2e6869408f0f@c34g2000pri.googlegroups.com>
Message-ID: <4B9FD6F4.3060503@cheimes.de>

Jordan Apgar wrote:
> Hey all,
> I'm trying to convert a string to a date time object and all my fields
> convert except for month which seems to default to january.
> 
> here's what I'm doing:
> date = "2010-03-16 14:46:38.409137"
>  olddate = datetime.strptime(date,"%Y-%m-%j %H:%M:%S.%f")
> 
> print date
> print olddate
> 
> I get:
> 2010-03-16 14:46:38.409137
> 2010-01-16 14:46:38.409137
> 
> notice the 01 in the second date from what I could tell everything is
> formatted correctly.


%j is documtend as "Day of the year as a decimal number [001,366].". Did
you mean %d instead?

Christian



From torriem at gmail.com  Tue Mar 16 15:07:38 2010
From: torriem at gmail.com (Michael Torrie)
Date: Tue, 16 Mar 2010 13:07:38 -0600
Subject: Searching for most pythonic/least stupid way to do something
	simple
In-Reply-To: <288bfc27-0c5b-4601-9ceb-dd2614593fb9@m37g2000yqf.googlegroups.com>
References: <d62c4091-e0f0-4195-9b0e-dd597f9d0131@u9g2000yqb.googlegroups.com>	<7xmxy87172.fsf@ruckus.brouhaha.com>	<2c39f6d4-3118-43f3-907d-57f733dc7ed8@d27g2000yqf.googlegroups.com>
	<288bfc27-0c5b-4601-9ceb-dd2614593fb9@m37g2000yqf.googlegroups.com>
Message-ID: <4B9FD6FA.2010607@gmail.com>

david jensen wrote:
> of course, changing nn's to:
> def getOutcomes(myList=[2,5,8,3,5]):
>    low_id = int(myList[0]>myList[1])
>    amountToShare = 2*myList[low_id]
>    remainder = myList[not low_id]-myList[low_id]
>    tail=list(myList[2:])
>    outcomes = [[amountToShare*perc, remainder+amountToShare*(1-perc)]+
> tail for perc in (1.0, 0.75, 0.5, 0.25, 0.0)] if not low_id else
> [[remainder+amountToShare*perc, amountToShare*(1-perc)]+ tail for perc
> in (1.0, 0.75, 0.5, 0.25, 0.0)]
>    return outcomes
> 
> 
> works, just hides the ugliness in a more compact form

If Gerard's code works, I would consider it far superior to your code
here.  Pythonic does not necessarily mean short and ugly, nor does it
mean that you have to always use list comprehensions.   Having a
readable algorithm that's easy to follow in the future is a far better
way than trying to use python's cool features to compact the code to as
small and unreadable section as possible.

I used to use list comprehension all the time, but I've found that often
an explicit for loop is a much better solution in terms of
maintainability.  Especially when you start seeing nested comprehensions
such as you have here.



From twistedphrame at gmail.com  Tue Mar 16 15:11:54 2010
From: twistedphrame at gmail.com (Jordan Apgar)
Date: Tue, 16 Mar 2010 12:11:54 -0700 (PDT)
Subject: datetime string conversion error
References: <8cebc349-33d5-4820-a944-2e6869408f0f@c34g2000pri.googlegroups.com>
	<mailman.861.1268766455.23598.python-list@python.org>
Message-ID: <b5e99137-e6de-4257-9248-dd8e9185098b@a18g2000yqc.googlegroups.com>

On Mar 16, 3:07?pm, Christian Heimes <li... at cheimes.de> wrote:
> Jordan Apgar wrote:
> > Hey all,
> > I'm trying to convert a string to a date time object and all my fields
> > convert except for month which seems to default to january.
>
> > here's what I'm doing:
> > date = "2010-03-16 14:46:38.409137"
> > ?olddate = datetime.strptime(date,"%Y-%m-%j %H:%M:%S.%f")
>
> > print date
> > print olddate
>
> > I get:
> > 2010-03-16 14:46:38.409137
> > 2010-01-16 14:46:38.409137
>
> > notice the 01 in the second date from what I could tell everything is
> > formatted correctly.
>
> %j is documtend as "Day of the year as a decimal number [001,366].". Did
> you mean %d instead?
>
> Christian

That fixed it, thank you



From gagsl-py2 at yahoo.com.ar  Tue Mar 16 15:12:21 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 16 Mar 2010 16:12:21 -0300
Subject: Python bindings tutorial
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>
Message-ID: <op.u9ocyv1qx6zn5v@lepton.softlabbsas.com.ar>

En Tue, 16 Mar 2010 13:20:40 -0300, Johny <python at hope.cz> escribi?:

> Is there any tutorial how to write a bindings for a exe ( dos)
> program?
> I would like to run it from a Python directly
> ( using import command and a particular function from the binding)
>  not using os.system command.

Do you mean that you want to execute a particular function in the .exe  
program?
That's not possible (ok, you *could* do that if you work hard enough, but  
that's not how things are usually done)

-- 
Gabriel Genellina



From zak.mc.kraken at libero.it  Tue Mar 16 15:17:43 2010
From: zak.mc.kraken at libero.it (Vito 'ZeD' De Tullio)
Date: Tue, 16 Mar 2010 20:17:43 +0100
Subject: subtraction is giving me a syntax error
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
	<mailman.800.1268675343.23598.python-list@python.org>
	<hnlt4p$4j1$1@reader1.panix.com>
	<4b9eb5bd$0$27822$c3e8da3@news.astraweb.com>
	<hnmduj$gnp$1@reader1.panix.com>
	<pan.2010.03.16.07.47.45@REMOVE.THIS.cybersource.com.au>
	<hno43a$lh8$1@reader1.panix.com>
Message-ID: <hnolgn$vg4$1@dough.gmane.org>

Grant Edwards wrote:

>> As for not being able to see the difference between a hyphen and an
>> EN- dash, or minus sign, or whatever it is, yes but they are very
>> similar looking glyphs in virtually ever modern font. It would take a
>> good eye to see the difference between (say) ??? ??? and -.
> 
> My point is that if it's an ASCII file,

source files aren't (necessary) ASCII files

-- 
By ZeD



From hansmu at xs4all.nl  Tue Mar 16 15:30:22 2010
From: hansmu at xs4all.nl (Hans Mulder)
Date: Tue, 16 Mar 2010 20:30:22 +0100
Subject: import antigravity
In-Reply-To: <k88477-giu.ln1@satorlaser.homedns.org>
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
	<k88477-giu.ln1@satorlaser.homedns.org>
Message-ID: <4b9fdc50$0$22943$e4fe514c@news.xs4all.nl>

Ulrich Eckhardt wrote:
> Chris Rebert wrote:
>> You're a bit behind the times.
>> If my calculations are right, that comic is over 2 years old.
> 
> import timetravel

I think you mean:

     from __future__ import timetravel


-- HansM


From martin.hellwig at dcuktec.org  Tue Mar 16 15:44:58 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Tue, 16 Mar 2010 19:44:58 +0000
Subject: import antigravity
In-Reply-To: <4b9fdc50$0$22943$e4fe514c@news.xs4all.nl>
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
	<k88477-giu.ln1@satorlaser.homedns.org>
	<4b9fdc50$0$22943$e4fe514c@news.xs4all.nl>
Message-ID: <hnon3k$hvh$1@news.eternal-september.org>

On 03/16/10 19:30, Hans Mulder wrote:
> Ulrich Eckhardt wrote:
>> Chris Rebert wrote:
>>> You're a bit behind the times.
>>> If my calculations are right, that comic is over 2 years old.
>>
>> import timetravel
>
> I think you mean:
>
> from __future__ import timetravel
>
>
> -- HansM

Well according to Marty it is:
from __back_to_the_future import DeLorean

-- 
mph


From python at mrabarnett.plus.com  Tue Mar 16 15:53:20 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 16 Mar 2010 19:53:20 +0000
Subject: datetime string conversion error
In-Reply-To: <8cebc349-33d5-4820-a944-2e6869408f0f@c34g2000pri.googlegroups.com>
References: <8cebc349-33d5-4820-a944-2e6869408f0f@c34g2000pri.googlegroups.com>
Message-ID: <4B9FE1B0.3040700@mrabarnett.plus.com>

Jordan Apgar wrote:
> Hey all,
> I'm trying to convert a string to a date time object and all my fields
> convert except for month which seems to default to january.
> 
> here's what I'm doing:
> date = "2010-03-16 14:46:38.409137"
>  olddate = datetime.strptime(date,"%Y-%m-%j %H:%M:%S.%f")
> 
> print date
> print olddate
> 
> I get:
> 2010-03-16 14:46:38.409137
> 2010-01-16 14:46:38.409137
> 
> notice the 01 in the second date from what I could tell everything is
> formatted correctly.
> 
The problem seems to be related to your use of "%j", which parses the
day of the year.

If I use "%d" instead, which parses the day of the month (I think that's
what you intended!), then the month comes out as 3 as expected.


From tjreedy at udel.edu  Tue Mar 16 16:04:22 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 16 Mar 2010 16:04:22 -0400
Subject: Understanding the CPython dict implementation
In-Reply-To: <4b9f6fab$0$27822$c3e8da3@news.astraweb.com>
References: <mailman.768.1268610003.23598.python-list@python.org>
	<4b9f6fab$0$27822$c3e8da3@news.astraweb.com>
Message-ID: <hnoo84$cub$1@dough.gmane.org>

On 3/16/2010 7:46 AM, Steven D'Aprano wrote:
> On Sun, 14 Mar 2010 19:39:46 -0400, Terry Reedy wrote:
>
>> I found this PyCon2010 presentation to be excellent: The Mighty
>> Dictionary, Branden Craig Rhodes, 30 min.

Sorry,
http://pycon.blip.tv/file/3332763/

which plays fine in FF3.6 on windows


>> http://pycon.blip.tv/file/3264041/

wrong file number

> Unfortunately, that clip seems to be unwatchable, at least for me. It
> crashed the Netscape plugin in Konqueror, and crashed Firefox.

The flash version does not work for me. This is true of about 1/3 of the 
Pycon 2010 videos that I have tried. The .ogv version of this and all 
others that I have tried (hit Download under Comments) plays fine within 
FF3.6 on my windows xp machine. Perhaps there is a linux-specific bug, 
if that is what you are running under.

Terry Jan Reedy




From tjreedy at udel.edu  Tue Mar 16 16:10:22 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 16 Mar 2010 16:10:22 -0400
Subject: Python bindings tutorial
In-Reply-To: <op.u9ocyv1qx6zn5v@lepton.softlabbsas.com.ar>
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>
	<op.u9ocyv1qx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <hnoojb$cub$2@dough.gmane.org>

On 3/16/2010 3:12 PM, Gabriel Genellina wrote:
> En Tue, 16 Mar 2010 13:20:40 -0300, Johny <python at hope.cz> escribi?:
>
>> Is there any tutorial how to write a bindings for a exe ( dos)
>> program?
>> I would like to run it from a Python directly
>> ( using import command and a particular function from the binding)
>> not using os.system command.
>
> Do you mean that you want to execute a particular function in the .exe
> program?
> That's not possible (ok, you *could* do that if you work hard enough,
> but that's not how things are usually done)

If running a function within the .exe *is* what you want, then you 
should compile to .dll instead of .exe and use swig or ctypes to do the 
binding.






From invalid at invalid.invalid  Tue Mar 16 16:12:29 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Tue, 16 Mar 2010 20:12:29 +0000 (UTC)
Subject: subtraction is giving me a syntax error
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
	<mailman.800.1268675343.23598.python-list@python.org>
	<hnlt4p$4j1$1@reader1.panix.com>
	<4b9eb5bd$0$27822$c3e8da3@news.astraweb.com>
	<hnmduj$gnp$1@reader1.panix.com>
	<pan.2010.03.16.07.47.45@REMOVE.THIS.cybersource.com.au>
	<hno43a$lh8$1@reader1.panix.com>
	<mailman.864.1268767076.23598.python-list@python.org>
Message-ID: <hnoond$gcg$1@reader1.panix.com>

On 2010-03-16, Vito 'ZeD' De Tullio <zak.mc.kraken at libero.it> wrote:
> Grant Edwards wrote:
>
>>> As for not being able to see the difference between a hyphen and an
>>> EN- dash, or minus sign, or whatever it is, yes but they are very
>>> similar looking glyphs in virtually ever modern font. It would take a
>>> good eye to see the difference between (say) ??? ??? and -.
>> 
>> My point is that if it's an ASCII file,
>
> source files aren't (necessary) ASCII files

OK, if it's a file with encoding <whatever>, then characters that
aren't part of <whatever> shouldn't be rendered according so some
other arbitrary character set.  Illegal characters should be flagged
and displayed in a manner that makes it obvious you have illegal
characters in in the file.

If the OP was using a source file with an encoding that isn't accepted
by Python, then he needs to pick a source file encoding that is
recognized by Python.

Using a source file encoding where there are semantically _different_
characters that render identically is just asking for pain...

-- 
Grant Edwards               grant.b.edwards        Yow! I guess you guys got
                                  at               BIG MUSCLES from doing too
                              gmail.com            much STUDYING!


From jgardner at jonathangardner.net  Tue Mar 16 16:15:13 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Tue, 16 Mar 2010 13:15:13 -0700
Subject: to pass self or not to pass self
In-Reply-To: <4b9f4984$0$10229$426a74cc@news.free.fr>
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
Message-ID: <6cc20cea1003161315i377bc9c2l525964b1cb6550e7@mail.gmail.com>

On Tue, Mar 16, 2010 at 2:04 AM, Bruno Desthuilliers
<bruno.42.desthuilliers at websiteburo.invalid> wrote:
> lallous a ?crit :
>>
>> What is the difference between the reference in 'F' and 'func_tbl' ?
>
> Answer here:
>
> http://wiki.python.org/moin/FromFunctionToMethod
>

Among all the things in the Python language proper, this is probably
the most confusing thing for new programmers. Heck, even experienced
programmers get tangled up because they project how they think things
should work on to the Python model.

The second most confusing thing is probably how objects get instantiated.

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From pavlovevidence at gmail.com  Tue Mar 16 16:16:50 2010
From: pavlovevidence at gmail.com (Carl Banks)
Date: Tue, 16 Mar 2010 13:16:50 -0700 (PDT)
Subject: C-API PyObject_Call
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
	<mailman.849.1268756405.23598.python-list@python.org>
	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>
	<mailman.858.1268759662.23598.python-list@python.org>
	<c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>
Message-ID: <afa22b98-e955-4559-a077-982cf55a3cab@q16g2000yqq.googlegroups.com>

On Mar 16, 11:25?am, moerchendiser2k3 <googler.
1.webmas... at spamgourmet.com> wrote:
> Hi, currently I am not at home, I will post some stuff when I am back.
> Just the note: I throw an exception with the C API.
>
> Looks like that
>
> PyObject *result = PyObject_Call(my_isntance, "", NULL);
> if(result==NULL)
> {
> ? ? PyErr_Print(); //when this happens, the traceback is correct with
> information about the file/line
> ? ? return;
>
> }
>
> if(!PyXYZ_Check(result))
> {
> ? ? PyErr_SetString(PyExc_TypeError, "Wrong type, ....");
> ? ? PyErr_Print(); //missing information of the file/line.
> ? ? return;
> }
>
> Well, I expect, that there are no information about the line/file, so
> I know something is missing, but what is missing?

Python tracebacks only contain line/file information about Python
files, not C files.  Here you raise an exception with a C statement,
and catch and print it in the very next line.  The exception doesn't
exit from Python code so there are no lines to print.

What line/file data you do expect to see?

If you want to see C line/file informnation you have to use a debugger
like gdb, as Steve Holden said.


Carl Banks


From dmj.ccc at gmail.com  Tue Mar 16 16:27:19 2010
From: dmj.ccc at gmail.com (david jensen)
Date: Tue, 16 Mar 2010 13:27:19 -0700 (PDT)
Subject: Searching for most pythonic/least stupid way to do something 
	simple
References: <d62c4091-e0f0-4195-9b0e-dd597f9d0131@u9g2000yqb.googlegroups.com>
	<7xmxy87172.fsf@ruckus.brouhaha.com>
	<2c39f6d4-3118-43f3-907d-57f733dc7ed8@d27g2000yqf.googlegroups.com>
	<288bfc27-0c5b-4601-9ceb-dd2614593fb9@m37g2000yqf.googlegroups.com> 
	<mailman.862.1268766468.23598.python-list@python.org>
Message-ID: <03631aaf-0cf2-4c15-9e0d-7ac0f33ae01d@c16g2000yqd.googlegroups.com>

>If Gerard's code works, I would consider it far superior to your code
>here.  Pythonic does not necessarily mean short and ugly

yes, I agree... and in my script i'm using something very like
Gerard's (thanks again, Gerard). I just posted the corrected version
of nn's because the original solved only half the problem.

thanks, all

dmj


From aahz at pythoncraft.com  Tue Mar 16 16:37:57 2010
From: aahz at pythoncraft.com (Aahz)
Date: 16 Mar 2010 13:37:57 -0700
Subject: The first ASIC designed with MyHDL
References: <4b9f7414$0$2887$ba620e4c@news.skynet.be>
Message-ID: <hnoq75$gsi$1@panix5.panix.com>

In article <4b9f7414$0$2887$ba620e4c at news.skynet.be>,
Jan Decaluwe  <jan at jandecaluwe.com> wrote:
>
>I am proud to report on the first ASIC product designed with MyHDL
>(afaik).
>
>http://www.jandecaluwe.com/hdldesign/digmac.html

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

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From benjamin.kaplan at case.edu  Tue Mar 16 16:42:05 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Tue, 16 Mar 2010 16:42:05 -0400
Subject: subtraction is giving me a syntax error
In-Reply-To: <hnoond$gcg$1@reader1.panix.com>
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
	<mailman.800.1268675343.23598.python-list@python.org>
	<hnlt4p$4j1$1@reader1.panix.com>
	<4b9eb5bd$0$27822$c3e8da3@news.astraweb.com>
	<hnmduj$gnp$1@reader1.panix.com>
	<pan.2010.03.16.07.47.45@REMOVE.THIS.cybersource.com.au>
	<hno43a$lh8$1@reader1.panix.com>
	<mailman.864.1268767076.23598.python-list@python.org>
	<hnoond$gcg$1@reader1.panix.com>
Message-ID: <ec96e1391003161342g6e21255bif1b29f4a31c15100@mail.gmail.com>

On Tue, Mar 16, 2010 at 4:12 PM, Grant Edwards <invalid at invalid.invalid>wrote:

> On 2010-03-16, Vito 'ZeD' De Tullio <zak.mc.kraken at libero.it> wrote:
> > Grant Edwards wrote:
> >
> >>> As for not being able to see the difference between a hyphen and an
> >>> EN- dash, or minus sign, or whatever it is, yes but they are very
> >>> similar looking glyphs in virtually ever modern font. It would take a
> >>> good eye to see the difference between (say) ??? ??? and -.
> >>
> >> My point is that if it's an ASCII file,
> >
> > source files aren't (necessary) ASCII files
>
> OK, if it's a file with encoding <whatever>, then characters that
> aren't part of <whatever> shouldn't be rendered according so some
> other arbitrary character set.  Illegal characters should be flagged
> and displayed in a manner that makes it obvious you have illegal
> characters in in the file.
>
> If the OP was using a source file with an encoding that isn't accepted
> by Python, then he needs to pick a source file encoding that is
> recognized by Python.
>
> Using a source file encoding where there are semantically _different_
> characters that render identically is just asking for pain...
>
>
>>> print u'\N{HYPHEN-MINUS}'
-
>>> print u'\N{MINUS SIGN}'
?
>>> print u'\N{SMALL HYPHEN-MINUS}'
?
>>> print u'\N{FIGURE DASH}'
?
>>> print u'\N{EN DASH}'
?
>>> print u'\N{SMALL EM DASH}'
?
>>> print u'\N{EM DASH}'
?
>>> print u'\N{HORIZONTAL BAR}'
?


Good luck finding a character encoding where you can see the difference
between each of those in context. Do you program in a hex editor?


> --
> Grant Edwards               grant.b.edwards        Yow! I guess you guys
> got
>                                  at               BIG MUSCLES from doing
> too
>                              gmail.com            much STUDYING!
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From breamoreboy at yahoo.co.uk  Tue Mar 16 16:44:09 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Tue, 16 Mar 2010 20:44:09 +0000
Subject: import antigravity
In-Reply-To: <4b9fdc50$0$22943$e4fe514c@news.xs4all.nl>
References: <hnnclk$eud$1@lust.ihug.co.nz>	<mailman.820.1268725930.23598.python-list@python.org>	<k88477-giu.ln1@satorlaser.homedns.org>
	<4b9fdc50$0$22943$e4fe514c@news.xs4all.nl>
Message-ID: <hnoqiq$md7$1@dough.gmane.org>

Hans Mulder wrote:
> Ulrich Eckhardt wrote:
>> Chris Rebert wrote:
>>> You're a bit behind the times.
>>> If my calculations are right, that comic is over 2 years old.
>>
>> import timetravel
> 
> I think you mean:
> 
>     from __future__ import timetravel
> 
> 
> -- HansM

Taking 1984 into account surely it should be

from __past__ import __future__ as future

But the question is, have we yet got to 1984, are we currently there or 
have we already gone past it?  Who actually *IS* running the time 
machine?  Are there any bugs??

Regards.

Mark Lawrence.



From gagsl-py2 at yahoo.com.ar  Tue Mar 16 18:39:04 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 16 Mar 2010 19:39:04 -0300
Subject: passing a socket to a subprocess in windows
References: <e776af95-e028-47a4-ba42-eda558660a30@e1g2000yqh.googlegroups.com>
Message-ID: <op.u9omjembx6zn5v@lepton.softlabbsas.com.ar>

En Tue, 16 Mar 2010 14:10:16 -0300, Daniel Platz  
<mail.to.daniel.platz at googlemail.com> escribi?:

> I have a problem with passing a socket to a subprocess in windows. It
> works in Linux and for windows there is a workaround in the Python
> doc. However, this workaround does not work. It was already noted by
> other people and they Python issue tracker
>
> http://bugs.python.org/issue5879

Unfortunately I cannot test it at this moment, but around line 360 in  
socketmodule.c:

#if defined(MS_WINDOWS) || defined(__BEOS__)
  ...
#define NO_DUP /* Actually it exists on NT 3.5, but what the heck... */
#endif

you could try removing that #define NO_DUP and recompiling. socket.fromfd  
should appear, and hopefully socket objects can now be sent thru the  
multiprocessing connection.

(I cannot see how the example could have actually worked on Windows, maybe  
I'm missing something. Perhaps http://bugs.python.org/issue3125 broke  
this.)

-- 
Gabriel Genellina



From jlundell at pobox.com  Tue Mar 16 18:55:17 2010
From: jlundell at pobox.com (JLundell)
Date: Tue, 16 Mar 2010 15:55:17 -0700 (PDT)
Subject: class inheritance
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
	<9bb4c1e7-858e-4ee6-870b-5a6549b6c496@b36g2000pri.googlegroups.com> 
	<05d0d40f-3fa0-4095-875d-777b49122d12@l12g2000prg.googlegroups.com> 
	<7088c1e1-9a1f-42d8-aac2-5ba19806165a@o30g2000yqb.googlegroups.com> 
	<4B9F7B2A.1080906@ieee.org>
	<mailman.845.1268752020.23598.python-list@python.org>
Message-ID: <f4838d80-3c2d-4249-bf08-35c6f34f166e@w9g2000prb.googlegroups.com>

On Mar 16, 8:06?am, Robert Kern <robert.k... at gmail.com> wrote:
> On 2010-03-16 07:35 AM, Dave Angel wrote:
>
>
>
>
>
>
>
> > Carl Banks wrote:
> >> On Mar 15, 4:34 pm, JLundell <jlund... at pobox.com> wrote:
> >>> It's also unfortunate that Python doesn't have an approximately-equal
> >>> operator; it'd come in handy for floating-point applications while
> >>> preserving hash. If only there were a ~=r ? operator I could
> >>> overload. And ~ is unary, so no joy.
>
> >> One problem with it is that there's no way to make it universal;
> >> different appiplications have different ideas of close. Conceivably
> >> it could be usefully defined for a user type though..
>
> >> Bacause of this problem almost no languages have an almost equal
> >> operator. I'm curious what languages do, of if there are any with a
> >> trinary operator that also takes a threshold.
>
> >> Carl Banks
>
> > If I recall correctly, APL has a *fuzz* value, which is used in all(?)
> > comparisons. But I do not recall anything about how it was defined. I do
> > recall that you could change the threshold, and suspect it was relative
> > to the operands. For symmetry, it would probably have to be relative to
> > the average of the two values, or some such.
>
> The problem is that frequently there is no system-wide fuzz value which is
> appropriate for all comparisons in a given program. You need to choose the right
> value for each comparison. Consequently, you might as well use a function
> instead of an operator and a global variable.
>
> --
> Robert Kern
>

APL scaled their fuzz to the larger of the values being compared. In
my case, my domain permits me to use a constant fuzz; all my units are
the same (votes, as it happens). I've seen abs(a/b-1) used instead of
abs(a-b); obviously you'd need to treat comparison with zero
specially.

But yeah, it's really a domain-specific problem.


From joshua.r.english at gmail.com  Tue Mar 16 19:31:11 2010
From: joshua.r.english at gmail.com (Josh English)
Date: Tue, 16 Mar 2010 16:31:11 -0700 (PDT)
Subject: datetime string conversion error
References: <8cebc349-33d5-4820-a944-2e6869408f0f@c34g2000pri.googlegroups.com>
Message-ID: <f1829de4-43d9-4e14-b9ea-9ee170358641@k24g2000pro.googlegroups.com>

On Mar 16, 11:56?am, Jordan Apgar <twistedphr... at gmail.com> wrote:

> here's what I'm doing:
> date = "2010-03-16 14:46:38.409137"
> ?olddate = datetime.strptime(date,"%Y-%m-%j %H:%M:%S.%f")
>

Due to circumstances, I'm using Python 2.5.4 on one machine (2.6 on
the other).

When I have a script as simple as this:

import datetime

datetime.datetime.strptime('2010-09-14', "%Y-%m-%d")


Running this script brings up a calendar, believe it or not. The
calendar displays March 2010, and shows the 22nd as a holiday. When I
dismiss the dialog box I get:
Traceback (most recent call last):
  File "strptimetest.py", line 3, in <module>
    datetime.datetime.strptime('2010-09-14', "%Y-%m-%d")
  File "C:\Python25\lib\_strptime.py", line 272, in <module>
    _TimeRE_cache = TimeRE()
  File "C:\Python25\lib\_strptime.py", line 191, in __init__
    self.locale_time = LocaleTime()
  File "C:\Python25\lib\_strptime.py", line 74, in __init__
    self.__calc_weekday()
  File "C:\Python25\lib\_strptime.py", line 94, in __calc_weekday
    a_weekday = [calendar.day_abbr[i].lower() for i in range(7)]
AttributeError: 'module' object has no attribute 'day_abbr'


err... what? Is this an old weirdness I don't remember from the 2.5
series?

I can select dates in the calendar, but nothing dismisses it but the
close box.

Josh English
Incredibly Confused


From robert.kern at gmail.com  Tue Mar 16 19:32:04 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 16 Mar 2010 18:32:04 -0500
Subject: class inheritance
In-Reply-To: <f4838d80-3c2d-4249-bf08-35c6f34f166e@w9g2000prb.googlegroups.com>
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>	<9bb4c1e7-858e-4ee6-870b-5a6549b6c496@b36g2000pri.googlegroups.com>
	<05d0d40f-3fa0-4095-875d-777b49122d12@l12g2000prg.googlegroups.com>
	<7088c1e1-9a1f-42d8-aac2-5ba19806165a@o30g2000yqb.googlegroups.com>
	<4B9F7B2A.1080906@ieee.org>	<mailman.845.1268752020.23598.python-list@python.org>
	<f4838d80-3c2d-4249-bf08-35c6f34f166e@w9g2000prb.googlegroups.com>
Message-ID: <hnp4dm$pj0$1@dough.gmane.org>

On 2010-03-16 17:55 PM, JLundell wrote:
> On Mar 16, 8:06 am, Robert Kern<robert.k... at gmail.com>  wrote:
>> On 2010-03-16 07:35 AM, Dave Angel wrote:
>>
>>> Carl Banks wrote:
>>>> On Mar 15, 4:34 pm, JLundell<jlund... at pobox.com>  wrote:
>>>>> It's also unfortunate that Python doesn't have an approximately-equal
>>>>> operator; it'd come in handy for floating-point applications while
>>>>> preserving hash. If only there were a ~=r ? operator I could
>>>>> overload. And ~ is unary, so no joy.
>>
>>>> One problem with it is that there's no way to make it universal;
>>>> different appiplications have different ideas of close. Conceivably
>>>> it could be usefully defined for a user type though..
>>
>>>> Bacause of this problem almost no languages have an almost equal
>>>> operator. I'm curious what languages do, of if there are any with a
>>>> trinary operator that also takes a threshold.
>>
>>>> Carl Banks
>>
>>> If I recall correctly, APL has a *fuzz* value, which is used in all(?)
>>> comparisons. But I do not recall anything about how it was defined. I do
>>> recall that you could change the threshold, and suspect it was relative
>>> to the operands. For symmetry, it would probably have to be relative to
>>> the average of the two values, or some such.
>>
>> The problem is that frequently there is no system-wide fuzz value which is
>> appropriate for all comparisons in a given program. You need to choose the right
>> value for each comparison. Consequently, you might as well use a function
>> instead of an operator and a global variable.
>>
>> --
>> Robert Kern
>>
>
> APL scaled their fuzz to the larger of the values being compared.

I know. My statement stands for relative fuzz values as well as it does for 
absolute fuzz values. :-)

> In
> my case, my domain permits me to use a constant fuzz; all my units are
> the same (votes, as it happens). I've seen abs(a/b-1) used instead of
> abs(a-b); obviously you'd need to treat comparison with zero
> specially.

One usually uses a combination of relative and absolute tolerances to account 
for the case when the values are close to zero.

> But yeah, it's really a domain-specific problem.

Right. And a single program might need to deal with multiple domains, so a 
single global setting to control a language feature is pretty fragile.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From greg.ewing at canterbury.ac.nz  Tue Mar 16 19:32:40 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Wed, 17 Mar 2010 12:32:40 +1300
Subject: Function that knows its argument's variable name
In-Reply-To: <47e725b6-1470-4563-a64b-02630032ef36@g26g2000yqn.googlegroups.com>
References: <47e725b6-1470-4563-a64b-02630032ef36@g26g2000yqn.googlegroups.com>
Message-ID: <80ai5hFh3uU1@mid.individual.net>

Helge Stenstr?m wrote:

> I want to write  function that prints a value of a variable, for
> debugging. Like:
> 
> myVariable = "parrot"
> otherVariable = "dead"
 >
> probe(myVariable)
> probe(otherVariable)

Not exactly, but you can come close with a little hackery.

import sys

def print_var(name):
   print name, "=", sys._getframe(1).f_locals[name]

def f():
   fred = 42
   mary = "christmas"
   print_var("fred")
   print_var("mary")

f()

-- 
Greg


From phlip2005 at gmail.com  Tue Mar 16 19:40:46 2010
From: phlip2005 at gmail.com (Phlip)
Date: Tue, 16 Mar 2010 16:40:46 -0700 (PDT)
Subject: Function that knows its argument's variable name
References: <47e725b6-1470-4563-a64b-02630032ef36@g26g2000yqn.googlegroups.com>
	<mailman.735.1268585160.23598.python-list@python.org>
Message-ID: <460a8b90-ee92-458c-b09e-abf230d7cdbc@q23g2000yqd.googlegroups.com>

> Yet, the answer to your question is not quite absolutely "no". ?Python
> has lots of introspection capabilities, including, perhaps, getting at
> and parsing the original code to find the call. ? ?But there's nothing
> direct for what you want.
>
> Gary Herron

Below my sig is one shot at it; which requires a lambda: for other
reasons. It's an assertion used with Django models.

You can search for the name of your trace method, instead of lambda,
using this brute-force technique.

And here's a nice thread on Greg's technique, from a very short time
ago:

  http://groups.google.com/group/comp.lang.python/msg/03dd85ce009044e9

--
  Phlip
  http://penbird.tumblr.com/

    def assert_model_changes(self, mod, item, frum, too, lamb):
        source = open(lamb.func_code.co_filename, 'r').readlines()
[lamb.func_code.co_firstlineno - 1]
        source = source.replace('lambda:', '').strip()
        model  = str(mod.__class__).replace("'>", '').split('.')[-1]

        should = '%s.%s should equal `%s` before your activation line,
`%s`' % \
                  (model, item, frum, source)

        self.assertEqual(frum, mod.__dict__[item], should)
        lamb()
        mod = mod.__class__.objects.get(pk=mod.pk)

        should = '%s.%s should equal `%s` after your activation line, `
%s`' % \
                  (model, item, too, source)

        self.assertEqual(too, mod.__dict__[item], should)
        return mod


From aahz at pythoncraft.com  Tue Mar 16 19:47:41 2010
From: aahz at pythoncraft.com (Aahz)
Date: 16 Mar 2010 16:47:41 -0700
Subject: highlight words by regex in pdf files using python
References: <af0830ae-1d24-4db9-b721-d6602fedd540@15g2000yqi.googlegroups.com>
Message-ID: <hnp5at$eig$1@panix5.panix.com>

In article <af0830ae-1d24-4db9-b721-d6602fedd540 at 15g2000yqi.googlegroups.com>,
Peng Yu  <pengyu.ut at gmail.com> wrote:
>
>I don't find a general pdf library in python that can do any
>operations on pdfs.
>
>I want to automatically highlight certain words (using regex) in a
>pdf. Could somebody let me know if there is a tool to do so in python?

Did you Google at all?  "python pdf" finds this as the first link, though
I have no clue whether it does what you want:

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

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From spamfresser at ch3ka.de  Tue Mar 16 19:48:02 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Wed, 17 Mar 2010 00:48:02 +0100
Subject: import antigravity
In-Reply-To: <mailman.870.1268772266.23598.python-list@python.org>
References: <hnnclk$eud$1@lust.ihug.co.nz>	<mailman.820.1268725930.23598.python-list@python.org>	<k88477-giu.ln1@satorlaser.homedns.org>	<4b9fdc50$0$22943$e4fe514c@news.xs4all.nl>
	<mailman.870.1268772266.23598.python-list@python.org>
Message-ID: <hnp5bh$paj$1@news.urz.uni-heidelberg.de>

Am 16.03.2010 21:44, schrieb Mark Lawrence:
> Who actually *IS* running the time machine?  Are there any bugs??

My is. And as I'm a lazy hacker: sure. there are bugs. lets just call 
them features and move on. nothing to see here ;)


From aahz at pythoncraft.com  Tue Mar 16 19:51:23 2010
From: aahz at pythoncraft.com (Aahz)
Date: 16 Mar 2010 16:51:23 -0700
Subject: Conditional based on whether or not a module is being used
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
	<mailman.376.1267819057.23598.python-list@python.org>
	<ec8e0912-bc85-4c51-85f5-fc855e289c1c@k6g2000prg.googlegroups.com>
Message-ID: <hnp5hr$jn4$1@panix5.panix.com>

In article <ec8e0912-bc85-4c51-85f5-fc855e289c1c at k6g2000prg.googlegroups.com>,
Pete Emerson  <pemerson at gmail.com> wrote:
>
>Excellent, this is what I finally discovered, although I was looking
>for 'foo' in sys.modules.keys(), which apparently isn't necessary.

Actually, `foo in sys.modules.keys()` is double-slow, because first the
dict must be scanned to create a list, and then the list must be scanned
linearly to test for foo.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From aahz at pythoncraft.com  Tue Mar 16 19:55:51 2010
From: aahz at pythoncraft.com (Aahz)
Date: 16 Mar 2010 16:55:51 -0700
Subject: Conditional based on whether or not a module is being used
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
	<29c6a957-5028-4c2d-8594-6c4db8243ef2@d2g2000yqa.googlegroups.com>
	<mailman.422.1267965329.23598.python-list@python.org>
	<42062deb-785a-4955-9ce0-d9fb7a26455d@j27g2000yqn.googlegroups.com>
Message-ID: <hnp5q7$qa4$1@panix5.panix.com>

In article <42062deb-785a-4955-9ce0-d9fb7a26455d at j27g2000yqn.googlegroups.com>,
Vinay Sajip  <vinay_sajip at yahoo.co.uk> wrote:
>
>I'm reviewing the documentation at the moment, as it happens, and it
>still seems hard to be able to put together a structure which is good
>for everyone. A full treatment, it seems to me, would talk a little
>about the detail of why things work as they do; but a lot of the time,
>people are just interested in getting going with the package, and less
>interested in the whys and wherefores. But for people trying to do more
>than the basics, that deeper understanding is sometimes necessary. The
>hard part is satisfying all audiences in one document!

Simple answer: don't

The main logging docs should be reference material, but the top of the
docs should link to a tutorial (or the other way around, but I think the
Python docs have generally preferred to make the primary doc reference).

Trying to make one page serve all documentation purposes rarely works.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From gagsl-py2 at yahoo.com.ar  Tue Mar 16 20:02:38 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 16 Mar 2010 21:02:38 -0300
Subject: cycling through options
References: <rie7hpcs5ic.fsf@alder.acc.bessy.de>
Message-ID: <op.u9oqeocux6zn5v@lepton.softlabbsas.com.ar>

En Tue, 16 Mar 2010 11:30:51 -0300, Dieter Faulbaum  
<Dieter.Faulbaum at bessy.de> escribi?:

> is there a better way for cycling through all options than this:
>
>
> (options, args) = parser.parse_args()
> for opt in options.__dict__.keys():
>      print opt, ":", options.__dict__[opt]

(I assume parser is an optparse.OptionParser instance)
You may rewrite it as:

for oname, ovalue in vars(options).iteritems():
   print oname, ":", ovalue

This assumes that the only instance attributes existing in 'options' are,  
uh, parsed options from the command line. I could not find such guarantee  
in the documentation. Another way would be to ask the parser about the  
options it knows of:

for oname in (o.dest for o in parser.option_list if o.dest):
   print oname, ":", getattr(options, oname, None)

-- 
Gabriel Genellina



From skippy.hammond at gmail.com  Tue Mar 16 20:08:10 2010
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Wed, 17 Mar 2010 11:08:10 +1100
Subject: How to add a library path to pythonpath ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF684F3C883@enbmail01.lsi.com>
References: <mailman.62.1268737204.24845.python-list@python.org>	<7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>	<1fb1c371003160527q10add6bfk75c09b24bc486329@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C883@enbmail01.lsi.com>
Message-ID: <4BA01D6A.60208@gmail.com>

On 17/03/2010 1:26 AM, Barak, Ron wrote:
> Thanks for the suggestion Pable.
> However, I really need the $PYTHONPATH to include this additional
> library, so all Python scripts could use it.
> In Windows I have defined PYTHONPATH as
> c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\, and also in the
> Windows registry I have
> HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\/version/\PythonPath\ as
> C:\Python26\Lib;C:\Python26\DLLs;C:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\;C:\Python26\Lib\lib-tk;
> However, even with all the above, the SVMInspecor modules are not found.

You need to create your own sub-key, with any name, under the PythonPath 
key and add your path there.  The reason is that Python only looks for 
that root key when it can't sniff the location of the library itself 
based on the location of the executable - and in most cases it can. 
Python does however enumerate and use the sub-keys in all cases.

HTH,

Mark


From dg.gmane at thesamovar.net  Tue Mar 16 21:00:11 2010
From: dg.gmane at thesamovar.net (Dan Goodman)
Date: Wed, 17 Mar 2010 02:00:11 +0100
Subject: C++ code generation
Message-ID: <hnp9is$8gp$1@dough.gmane.org>

Hi all,

I'm doing some C++ code generation using Python, and would be interested 
in any comments on the approach I'm taking.

Basically, the problem involves doing some nested loops and executing 
relatively simple arithmetic code snippets, like:

for i in xrange(len(X)):
   X[i] += 5

Actually they're considerably more complicated than this, but this gives 
the basic idea. One way to get C++ code from this would be to use 
Cython, but there are two problems with doing that. The first problem is 
that the arithmetic code snippets are user-specified. What I want to do 
is generate code, and then compile and run it using Scipy's weave 
package. The second problem is that I have various different data 
structures and the C++ code generated needs to be different for the 
different structures (e.g. sparse or dense matrices).

So far what I've been doing is writing Python code that writes the C++ 
code, but in a very non-transparent way. I like the idea of specifying 
the C++ code using Python syntax, like in Cython. So the idea I came up 
with was basically to abuse generators and iterators so that when you 
write something like:

for x in X:
    ...

it actually outputs some C++ code that looks like:

for(int i=0; i<X_len; i++){
double &x = X[i];
...
}

The ... in the Python code is only executed once because when X is 
iterated over it only returns one value.

Here's the example I've written so far (complete code given below):

# initialisation code
code = OutputCode()
evaluate = Evaluator(code)
X = Array(code, 'values')
# specification of the C++ loop
for x in X:
     evaluate('x += 5; x *= 2')
# and show the output
print code.code

It generates the following C++ code:

for(int values_index=0; values_index<values_len; values_index++){
double &values = values_array[values_index];
values += 5;
values *= 2;
}

OK, so that's an overview of the idea that I have of how to do it. Any 
comments or suggestions on either the approach or the implementation?

Below is the complete code I've written for the example above (linewraps 
aren't perfect but there's only a couple of lines to correct).

Thanks for any feedback,

Dan

import re, inspect

# We just use this class to identify certain variables
class Symbol(str): pass

# This class is basically just a mutable string
class OutputCode(object):
     def __init__(self):
         self.code = ''
     def __iadd__(self, code):
         self.code = self.code+code
         return self

# Iterating over instances of this class generates code
# for iterating over a C++ array, it yields a single
# Symbol object, the variable name of the value in the
# array
class Array(object):
     def __init__(self, code, name, dtype='double'):
         self.name = name
         self.dtype = dtype
         self.code = code
     def __iter__(self):
         def f():
             self.code += 'for(int {name}_index=0; 
{name}_index<{name}_len; {name}_index++){{\n'.format(name=self.name)
             self.code += '{dtype} &{name} = 
{name}_array[{name}_index];\n'.format(dtype=self.dtype, name=self.name)
             yield Symbol(self.name)
             self.code += '}\n'
         return f()

# Instances of this class generate C++ code from Python syntax
# code snippets, replacing variable names that are a Symbol in the
# namespace with the value of that Symbol.
class Evaluator(object):
     def __init__(self, code):
         self.code = code
     def __call__(self, code):
         # The set of variables in the code snippet
         vars = re.findall(r'\b(\w+)\b', code)
         # Extract any names from the namespace of the calling frame
         frame = inspect.stack()[1][0]
         globals, locals = frame.f_globals, frame.f_locals
         values = {}
         for var in vars:
             if var in locals:
                 values[var] = locals[var]
             elif var in globals:
                 values[var] = globals[var]
         # Replace any variables whose values are Symbols with their values
         for var, value in values.iteritems():
             if isinstance(value, Symbol):
                 code = re.sub(r'\b{var}\b'.format(var=var), str(value), 
code)
         # Turn Python snippets into C++ (just a simplified version for now)
         code = code.replace(';', '\n')
         lines = [line.strip() for line in code.split('\n')]
         code = ''.join(line+';\n' for line in lines)
         self.code += code

if __name__=='__main__':
     code = OutputCode()
     evaluate = Evaluator(code)
     X = Array(code, 'values')
     for x in X:
         evaluate('x += 5; x *= 2')
     print code.code



From dr.cg at 126.com  Tue Mar 16 21:02:02 2010
From: dr.cg at 126.com (CHEN Guang)
Date: Wed, 17 Mar 2010 09:02:02 +0800 (CST)
Subject: Python bindings tutorial
Message-ID: <1e0af4b.bc0.12769a437c5.Coremail.dr.cg@126.com>


> Is there any tutorial how to write a bindings for a exe ( dos)
> program?
> I would like to run it from a Python directly
> ( using import command and a particular function from the binding)
> not using os.system command.
 
An example: PythoidC ( http://pythoidc.googlecode.com ), look at importTemplate.py
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From dr.cg at 126.com  Tue Mar 16 21:54:25 2010
From: dr.cg at 126.com (CHEN Guang)
Date: Wed, 17 Mar 2010 09:54:25 +0800 (CST)
Subject: C++ code generation
Message-ID: <11c0630.1732.12769d42e98.Coremail.dr.cg@126.com>

PythoidC ( http://pythoidc.googlecode.com ) is a C code generator (not C++)
 
----- Original Message ----- 
From: "Dan Goodman" <dg.gmane at thesamovar.net>
To: <python-list at python.org>
Sent: Wednesday, March 17, 2010 9:00 AM
Subject: C++ code generation


> Hi all,
> 
> I'm doing some C++ code generation using Python, and would be interested 
> in any comments on the approach I'm taking.
> 
> Basically, the problem involves doing some nested loops and executing 
> relatively simple arithmetic code snippets, like:
> 
> for i in xrange(len(X)):
>   X[i] += 5
> 
> Actually they're considerably more complicated than this, but this gives 
> the basic idea. One way to get C++ code from this would be to use 
> Cython, but there are two problems with doing that. The first problem is 
> that the arithmetic code snippets are user-specified. What I want to do 
> is generate code, and then compile and run it using Scipy's weave 
> package. The second problem is that I have various different data 
> structures and the C++ code generated needs to be different for the 
> different structures (e.g. sparse or dense matrices).
> 
> So far what I've been doing is writing Python code that writes the C++ 
> code, but in a very non-transparent way. I like the idea of specifying 
> the C++ code using Python syntax, like in Cython. So the idea I came up 
> with was basically to abuse generators and iterators so that when you 
> write something like:
> 
> for x in X:
>    ...
> 
> it actually outputs some C++ code that looks like:
> 
> for(int i=0; i<X_len; i++){
> double &x = X[i];
> ...
> }
> 
> The ... in the Python code is only executed once because when X is 
> iterated over it only returns one value.
> 
> Here's the example I've written so far (complete code given below):
> 
> # initialisation code
> code = OutputCode()
> evaluate = Evaluator(code)
> X = Array(code, 'values')
> # specification of the C++ loop
> for x in X:
>     evaluate('x += 5; x *= 2')
> # and show the output
> print code.code
> 
> It generates the following C++ code:
> 
> for(int values_index=0; values_index<values_len; values_index++){
> double &values = values_array[values_index];
> values += 5;
> values *= 2;
> }
> 
> OK, so that's an overview of the idea that I have of how to do it. Any 
> comments or suggestions on either the approach or the implementation?
> 
> Below is the complete code I've written for the example above (linewraps 
> aren't perfect but there's only a couple of lines to correct).
> 
> Thanks for any feedback,
> 
> Dan
> 
> import re, inspect
> 
> # We just use this class to identify certain variables
> class Symbol(str): pass
> 
> # This class is basically just a mutable string
> class OutputCode(object):
>     def __init__(self):
>         self.code = ''
>     def __iadd__(self, code):
>         self.code = self.code+code
>         return self
> 
> # Iterating over instances of this class generates code
> # for iterating over a C++ array, it yields a single
> # Symbol object, the variable name of the value in the
> # array
> class Array(object):
>     def __init__(self, code, name, dtype='double'):
>         self.name = name
>         self.dtype = dtype
>         self.code = code
>     def __iter__(self):
>         def f():
>             self.code += 'for(int {name}_index=0; 
> {name}_index<{name}_len; {name}_index++){{\n'.format(name=self.name)
>             self.code += '{dtype} &{name} = 
> {name}_array[{name}_index];\n'.format(dtype=self.dtype, name=self.name)
>             yield Symbol(self.name)
>             self.code += '}\n'
>         return f()
> 
> # Instances of this class generate C++ code from Python syntax
> # code snippets, replacing variable names that are a Symbol in the
> # namespace with the value of that Symbol.
> class Evaluator(object):
>     def __init__(self, code):
>         self.code = code
>     def __call__(self, code):
>         # The set of variables in the code snippet
>         vars = re.findall(r'\b(\w+)\b', code)
>         # Extract any names from the namespace of the calling frame
>         frame = inspect.stack()[1][0]
>         globals, locals = frame.f_globals, frame.f_locals
>         values = {}
>         for var in vars:
>             if var in locals:
>                 values[var] = locals[var]
>             elif var in globals:
>                 values[var] = globals[var]
>         # Replace any variables whose values are Symbols with their values
>         for var, value in values.iteritems():
>             if isinstance(value, Symbol):
>                 code = re.sub(r'\b{var}\b'.format(var=var), str(value), 
> code)
>         # Turn Python snippets into C++ (just a simplified version for now)
>         code = code.replace(';', '\n')
>         lines = [line.strip() for line in code.split('\n')]
>         code = ''.join(line+';\n' for line in lines)
>         self.code += code
> 
> if __name__=='__main__':
>     code = OutputCode()
>     evaluate = Evaluator(code)
>     X = Array(code, 'values')
>     for x in X:
>         evaluate('x += 5; x *= 2')
>     print code.code
> 
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From gagsl-py2 at yahoo.com.ar  Tue Mar 16 22:07:42 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 16 Mar 2010 23:07:42 -0300
Subject: How to handle file uploads with http.server
References: <91ad5bf81003110221m5e383f8fkc7959aa2887927eb@mail.gmail.com>
	<4728DC0EADB2654E8BA2A487F0CF2785AD6D2E@ws-ukexchange.internal.biowisdom.com>
Message-ID: <op.u9ov64scx6zn5v@lepton.softlabbsas.com.ar>

En Thu, 11 Mar 2010 07:30:24 -0300, Neil Blue <Neil.Blue at biowisdom.com>  
escribi?:

> I have a basic http.server instance running (class
> HTTPHandler(http.server.BaseHTTPRequestHandler), with python 3.1, and I
> would like to upload files with multipart forms.
>
> def do_POST(self):
> 	ctype, pdict = cgi.parse_header(self.headers['Content-Type'])
> 	if ctype=='multipart/form-data':
> 		print('parsing...')
> 		query=cgi.parse_multipart(self.rfile, pdict)
> 		print(query)
>
> However the file never seems to finish being parsed. There are no errors,
> but the call hangs at: query=cgi.parse_multipart(self.rfile, pdict)

This may be related to this bug:

http://bugs.python.org/issue8077

reported last week by Mitchell L. Model in this thread:

http://groups.google.com/group/comp.lang.python/t/8a7752bd79d5f5d6/

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Tue Mar 16 22:21:14 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 16 Mar 2010 23:21:14 -0300
Subject: Exiting gracefully from ThreadingTCPServer
References: <1f31cddf-1104-4579-bd61-5fad3b2c4677@t17g2000prg.googlegroups.com>
Message-ID: <op.u9owtonkx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 12 Mar 2010 12:15:16 -0300, Pete Emerson <pemerson at gmail.com>  
escribi?:

> I'm trying to get threading going for the first time in python, and
> I'm trying to modify code I found so that I can have the server close
> the TCP connections and exit gracefully. Two problems:

Which Python version?

> 1) While the KeyboardInterrupt works, if I make more than 0 curls to
> the server and then quit, I can't run it again right away and get
> this:
> socket.error: [Errno 48] Address already in use
>
> Not all of my connections are closing properly. How do I fix this?
>
> 2) curling localhost:8080/quit does show the "Quitting" output that I
> expect, but doesn't quit the server until I manually control-c it.

On Python 2.6, you should call the shutdown() method (from another  
thread!) instead of simply server_close()
See this recipe [1] -- just look at the main() function (disregard all the  
previous details); it runs the server(s) in their own thread, the main  
thread just sits and waits for KeyboardInterrupt or SystemExit.

[1] http://code.activestate.com/recipes/577025

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Tue Mar 16 22:25:50 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 16 Mar 2010 23:25:50 -0300
Subject: datetime string conversion error
References: <8cebc349-33d5-4820-a944-2e6869408f0f@c34g2000pri.googlegroups.com>
	<f1829de4-43d9-4e14-b9ea-9ee170358641@k24g2000pro.googlegroups.com>
Message-ID: <op.u9ow1cd4x6zn5v@lepton.softlabbsas.com.ar>

En Tue, 16 Mar 2010 20:31:11 -0300, Josh English  
<joshua.r.english at gmail.com> escribi?:

> On Mar 16, 11:56 am, Jordan Apgar <twistedphr... at gmail.com> wrote:
>
>> here's what I'm doing:
>> date = "2010-03-16 14:46:38.409137"
>>  olddate = datetime.strptime(date,"%Y-%m-%j %H:%M:%S.%f")
>>
>
> Due to circumstances, I'm using Python 2.5.4 on one machine (2.6 on
> the other).
>
> When I have a script as simple as this:
>
> import datetime
>
> datetime.datetime.strptime('2010-09-14', "%Y-%m-%d")
>
>
> Running this script brings up a calendar, believe it or not. The
> calendar displays March 2010, and shows the 22nd as a holiday. When I
> dismiss the dialog box I get:
> Traceback (most recent call last):
>   File "strptimetest.py", line 3, in <module>
>     datetime.datetime.strptime('2010-09-14', "%Y-%m-%d")
>   File "C:\Python25\lib\_strptime.py", line 272, in <module>
>     _TimeRE_cache = TimeRE()
>   File "C:\Python25\lib\_strptime.py", line 191, in __init__
>     self.locale_time = LocaleTime()
>   File "C:\Python25\lib\_strptime.py", line 74, in __init__
>     self.__calc_weekday()
>   File "C:\Python25\lib\_strptime.py", line 94, in __calc_weekday
>     a_weekday = [calendar.day_abbr[i].lower() for i in range(7)]
> AttributeError: 'module' object has no attribute 'day_abbr'

I'd say you have a calendar.py script somewhere along your sys.path, that  
shadows the calendar module in the standard library.

-- 
Gabriel Genellina



From googler.1.webmaster at spamgourmet.com  Tue Mar 16 22:45:50 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Tue, 16 Mar 2010 19:45:50 -0700 (PDT)
Subject: C-API PyObject_Call
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
	<mailman.849.1268756405.23598.python-list@python.org>
	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>
	<mailman.858.1268759662.23598.python-list@python.org>
	<c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>
	<afa22b98-e955-4559-a077-982cf55a3cab@q16g2000yqq.googlegroups.com>
Message-ID: <6d496959-1397-427d-82d3-9c11ca956e54@33g2000yqj.googlegroups.com>

At first thanks for your answers!!!

On 16 Mrz., 21:16, Carl Banks <pavlovevide... at gmail.com> wrote:
> Here you raise an exception with a C statement,
> and catch and print it in the very next line. ?The exception doesn't
> exit from Python code so there are no lines to print.

Exactly, I dont expect any line/file information. I am just looking
forward for a solution how to solve that. I would like to avoid
the use of the debugger in this case.

My ideas:

1. I thought the return value might contain any information where it
is from.
2. Otherwise it would be cool if there are any information available
in which line, file
the last called function/method exited.

Bye, moerchendiser2k3


From hidura at gmail.com  Tue Mar 16 23:08:17 2010
From: hidura at gmail.com (hidura at gmail.com)
Date: Wed, 17 Mar 2010 03:08:17 +0000
Subject: Web Hosting Python 3
Message-ID: <0016e64642280288940481f66d5e@google.com>

Hello list, i am in a project what need hosting, who give hosting to  
python3?
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From pmaupin at gmail.com  Wed Mar 17 00:12:16 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Tue, 16 Mar 2010 21:12:16 -0700 (PDT)
Subject: highlight words by regex in pdf files using python
References: <af0830ae-1d24-4db9-b721-d6602fedd540@15g2000yqi.googlegroups.com>
Message-ID: <1fc72785-e527-4809-b5a1-43d78fe86f87@r27g2000yqn.googlegroups.com>

On Mar 4, 6:57?pm, Peng Yu <pengyu... at gmail.com> wrote:
> I don't find a general pdf library in python that can do any
> operations on pdfs.
>
> I want to automatically highlight certain words (using regex) in a
> pdf. Could somebody let me know if there is a tool to do so in python?

The problem with PDFs is that they can be quite complicated.  There is
the outer container structure, which isn't too bad (unless the
document author applied encryption or fancy multi-object compression),
but then inside the graphics elements, things could be stored as
regular ASCII, or as fancy indexes into font-specific tables.  Not
rocket science, but the only industrial-strength solution for this is
probably reportlab's pagecatcher.

I have a library which works (primarily with the outer container) for
reading and writing, called pdfrw.  I also maintain a list of other
PDF tools at http://code.google.com/p/pdfrw/wiki/OtherLibraries  It
may be that pdfminer (link on that page) will do what you want -- it
is certainly trying to be complete as a PDF reader.  But I've never
personally used pdfminer.

One of my pdfrw examples at http://code.google.com/p/pdfrw/wiki/ExampleTools
will read in preexisting PDFs and write them out to a reportlab
canvas.  This works quite well on a few very simple ASCII PDFs, but
the font handling needs a lot of work and probably won't work at all
right now on unicode.  (But if you wanted to improve it, I certainly
would accept patches or give you commit rights!)

That pdfrw example does graphics reasonably well.  I was actually
going down that path for getting better vector graphics into rst2pdf
(both uniconvertor and svglib were broken for my purposes), but then I
realized that the PDF spec allows you to include a page from another
PDF quite easily (the spec calls it a form xObject), so you don't
actually need to parse down into the graphics stream for that.  So,
right now, the best way to do vector graphics with rst2pdf is either
to give it a preexisting PDF (which it passes off to pdfrw for
conversion into a form xObject), or to give it a .svg file and invoke
it with -e inkscape, and then it will use inkscape to convert the svg
to a pdf and then go through the same path.

HTH,
Pat


From levi.india at gmail.com  Wed Mar 17 00:15:46 2010
From: levi.india at gmail.com (pothuri ramesh)
Date: Tue, 16 Mar 2010 21:15:46 -0700 (PDT)
Subject: Data entry Work available
Message-ID: <09d51eec-68e7-4dac-a5bd-6bc3b0b656d6@l40g2000pro.googlegroups.com>

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From lie.1296 at gmail.com  Wed Mar 17 00:57:17 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Wed, 17 Mar 2010 15:57:17 +1100
Subject: to pass self or not to pass self
In-Reply-To: <mailman.860.1268765949.23598.python-list@python.org>
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org>
Message-ID: <4ba06148$1@dnews.tpgi.com.au>

On 03/17/2010 05:59 AM, Jason Tackaberry wrote:
> On Tue, 2010-03-16 at 10:04 +0100, Bruno Desthuilliers wrote:
>> Answer here:
>>
>> http://wiki.python.org/moin/FromFunctionToMethod
> 
> I have a sense I used to know this once upon a time, but the question
> came to my mind (possibly again) and I couldn't think of an answer:
> 
> Why not create the bound methods at instantiation time, rather than
> using the descriptor protocol which has the overhead of creating a new
> bound method each time the method attribute is accessed?

Because people wanted it like so. There was once, a time when python
doesn't have the descriptor protocol (old-style classes) and many people
feels that a high-level language like python should provide some
additional hooks for customizing attribute access which the existing
solutions like __getattr__ and __setattr__ couldn't easily provide. The
result is new-style class. Most people probably would never need to use
descriptor protocol directly, since the immediate benefit of descriptor
protocol are property(), classmethod(), and instancemethod() decorators
which, without descriptor protocol, would never become a possibility.


From sbassi at clubdelarazon.org  Wed Mar 17 01:22:49 2010
From: sbassi at clubdelarazon.org (Sebastian Bassi)
Date: Wed, 17 Mar 2010 02:22:49 -0300
Subject: Converting Python CGI to WSGI scripts
In-Reply-To: <1268759895.28810.1365130739@webmail.messagingengine.com>
References: <1268759895.28810.1365130739@webmail.messagingengine.com>
Message-ID: <9e2f512b1003162222v98772d0u8d3aea8ced1ee7bb@mail.gmail.com>

On Tue, Mar 16, 2010 at 2:18 PM,  <python at bdurham.com> wrote:
> I have a few dozen simple Python CGI scripts.
> Are there any advantages or disadvantages to rewriting these CGI scripts as
> WSGI scripts?

It depends of the script. WSGI should be faster since you don't start
a Python instance for each call (as in CGI).

-- 
Sebasti?n Bassi. Diplomado en Ciencia y Tecnolog?a.

Curso de Python en un d?a: http://bit.ly/cursopython
Python for Bioinformatics: http://tinyurl.com/biopython

Non standard disclaimer: READ CAREFULLY. By reading this email,
you agree, on behalf of your employer, to release me from all
obligations and waivers arising from any and all NON-NEGOTIATED
agreements, licenses, terms-of-service, shrinkwrap, clickwrap,
browsewrap, confidentiality, non-disclosure, non-compete and
acceptable use policies ("BOGUS AGREEMENTS") that I have
entered into with your employer, its partners, licensors, agents and
assigns, in perpetuity, without prejudice to my ongoing rights and
privileges. You further represent that you have the authority to release
me from any BOGUS AGREEMENTS on behalf of your employer.


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 17 01:32:05 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 17 Mar 2010 05:32:05 GMT
Subject: to pass self or not to pass self
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org>
	<4ba06148$1@dnews.tpgi.com.au>
Message-ID: <pan.2010.03.17.05.32.04@REMOVE.THIS.cybersource.com.au>

On Wed, 17 Mar 2010 15:57:17 +1100, Lie Ryan wrote:

> Most people probably would never need to use
> descriptor protocol directly, since the immediate benefit of descriptor
> protocol are property(), classmethod(), and instancemethod() decorators
> which, without descriptor protocol, would never become a possibility.


There's an instancemethod decorator? Where?

Are you thinking of staticmethod? "instancemethod", if you mean what I 
think you mean, doesn't need a decorator because it is the default 
behaviour for new-style classes.


-- 
Steven


From pmaupin at gmail.com  Wed Mar 17 01:35:03 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Tue, 16 Mar 2010 22:35:03 -0700 (PDT)
Subject: to pass self or not to pass self
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org>
Message-ID: <4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com>

On Mar 16, 1:59?pm, Jason Tackaberry <t... at urandom.ca> wrote:
> Why not create the bound methods at instantiation time, rather than
> using the descriptor protocol which has the overhead of creating a new
> bound method each time the method attribute is accessed?

Well, for one thing, Python classes are open.  They can be added to at
any time.  For another thing, you might not ever use most of the
methods of an instance, so it would be a huge waste to create those.

Also, this area has been optimized for normal usage patterns quite
heavily, to the point where attempted "optimizations" can lead to
results that are, on the surface, quite counterintuitive.

For example, if you want to take the length of a lot of different
strings, you might think you could save time by binding a local
variable to str.__len__ and using that on the strings.  Here is an
example:

>>> def a(s, count, lenfunc):
...     for i in xrange(count):
...        z = lenfunc(s)
...
>>> a('abcdef', 100000000, len)
>>> a('abcdef', 100000000, str.__len__)

Running cPython 2.6 on my machine, len() runs about 3 times faster
than str.__len__().  The overhead of checking that an object is usable
with a particular class method far outweighs the cost of creating the
bound method!

So, one thought for the OP.  Whenever I have a dictionary that
contains class methods in it, if I'm going to use it heavily, I often
recode it to create the dictionary at object creation time with bound
methods in it.

Regards,
Pat


From joshua.r.english at gmail.com  Wed Mar 17 02:13:47 2010
From: joshua.r.english at gmail.com (Josh English)
Date: Tue, 16 Mar 2010 23:13:47 -0700 (PDT)
Subject: Dynamic Class Creation
References: <b05e819c-a005-49d4-b0e7-78be9a56b268@q2g2000pre.googlegroups.com>
	<mailman.816.1268720338.23598.python-list@python.org>
Message-ID: <8d79f0cb-9c5b-4243-8891-a15fb311f652@z18g2000prh.googlegroups.com>

Chris,

Thanks. This worked for the attributes, but I think the tactic is
still misleading. There are child elements I can't quite determine how
to deal with:

<market code='anlg' tier='ProMarket' mail='True'>
    <title field="pref">Analog Science Fiction and Fact</title>
    <nickname>Analog</nickname>
    <keyword>Science Fiction</keyword>
    <keyword>First Contact</keyword>
    <keyword>Hard Science Fiction</keyword>
    <address>
        <attnline>Stanley Schmidt, Editor</attnline>
        <address1>267 Broadway, 4th Floor</address1>
        <address2>New York, NY 10007-2352</address2>
    </address>
    <website>http://www.analogsf.com</website>
</market>

A child element with text and an attribute or two, for example, pose a
problem. I can call Market.title but should I try Market.title.field
or Market.title_field.

Multiple elements, such as keywords, are allowed in xml but harder to
map to the object. I don't know if I want to go create a list and
methods for accessing those keywords as a list, or redefine the rules
of my XML to not allow multiple child elements with the same tag. I
can't decide.

Then the address is a bit of a bear.

In short, I have to figure out the whole object interface to the XML
and how I want that to work.

Thanks for the suggestion. It is undeniably clever.

Josh


From tino at wildenhain.de  Wed Mar 17 02:30:36 2010
From: tino at wildenhain.de (Tino Wildenhain)
Date: Wed, 17 Mar 2010 07:30:36 +0100
Subject: Function that knows its argument's variable name
In-Reply-To: <47e725b6-1470-4563-a64b-02630032ef36@g26g2000yqn.googlegroups.com>
References: <47e725b6-1470-4563-a64b-02630032ef36@g26g2000yqn.googlegroups.com>
Message-ID: <4BA0770C.2070306@wildenhain.de>

Hi,

Am 14.03.2010 12:58, schrieb Helge Stenstr?m:
> I want to write  function that prints a value of a variable, for
> debugging. Like:
>
> with
>
> myVariable = "parrot"
> otherVariable = "dead"
>
> probe(myVariable)
> probe(otherVariable)
>
> instead of the longer
>
> print "myVariable = ", myVariable
> print "otherVariable = ", otherVariable
>
> Is that even possible?
>
> The function would look like
>
> def probe(var):
>      nameOfVar = someMagic(var)
>      print nameOfVar, " = ", var
>
> but can someMagic(var) find the variable name? Is that possible?

apart from very hackery, why don't you just use:

def probe(**vars):
     for varname,value in vars.items():
         print "%s = %r" % (varname,value)

and call it like that:

probe(myvar="foo")
probe(othervar="bar")

or even

probe(myvar=myvar) (if myvar was assigned before)

please note introspective approaches have a very narrow field
where they can work - as already shown in other posts: you can have
values w/o names and also more then one name to a value (or object).

Regards
Tino Wildenhain

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From nagle at animats.com  Wed Mar 17 02:34:21 2010
From: nagle at animats.com (John Nagle)
Date: Tue, 16 Mar 2010 23:34:21 -0700
Subject: Converting Python CGI to WSGI scripts
In-Reply-To: <mailman.882.1268803376.23598.python-list@python.org>
References: <1268759895.28810.1365130739@webmail.messagingengine.com>
	<mailman.882.1268803376.23598.python-list@python.org>
Message-ID: <4ba0735b$0$1594$742ec2ed@news.sonic.net>

Sebastian Bassi wrote:
> On Tue, Mar 16, 2010 at 2:18 PM,  <python at bdurham.com> wrote:
>> I have a few dozen simple Python CGI scripts.
>> Are there any advantages or disadvantages to rewriting these CGI scripts as
>> WSGI scripts?
> 
> It depends of the script. WSGI should be faster since you don't start
> a Python instance for each call (as in CGI).

    It's almost always faster.  But be careful about global state.
Remember that WSGI/FCGI programs are really functions, called
over and over with a new transaction on each call.  So your
function has to be reusable.

    Things like initializing global variables at program load time,
rather than when the main function is called, may give trouble.
Also, be careful about leaving files, database connections, and
sockets open after the main function returns.

				John Nagle


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From stefan_ml at behnel.de  Wed Mar 17 02:46:20 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 17 Mar 2010 07:46:20 +0100
Subject: C-API PyObject_Call
In-Reply-To: <c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>	<mailman.849.1268756405.23598.python-list@python.org>	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>	<mailman.858.1268759662.23598.python-list@python.org>
	<c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>
Message-ID: <hnptrs$m4t$1@dough.gmane.org>

moerchendiser2k3, 16.03.2010 19:25:
> Hi, currently I am not at home, I will post some stuff when I am back.
> Just the note: I throw an exception with the C API.
>
> Looks like that
>
>
> PyObject *result = PyObject_Call(my_isntance, "", NULL);
> if(result==NULL)
> {
>      PyErr_Print(); //when this happens, the traceback is correct with
> information about the file/line
>      return;
> }
>
> if(!PyXYZ_Check(result))
> {
>      PyErr_SetString(PyExc_TypeError, "Wrong type, ....");
>      PyErr_Print(); //missing information of the file/line.
>      return;
> }
>
> Well, I expect, that there are no information about the line/file, so
> I know something is missing, but what is missing?

Two solutions here:

1) put the line number information into the message string when you raise 
the exception

2) use Cython instead of plain C, as Cython will automatically generate 
readable stack traces for you, also for non-Python functions.

Stefan



From stefan_ml at behnel.de  Wed Mar 17 02:48:31 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 17 Mar 2010 07:48:31 +0100
Subject: import antigravity
In-Reply-To: <hnp5bh$paj$1@news.urz.uni-heidelberg.de>
References: <hnnclk$eud$1@lust.ihug.co.nz>	<mailman.820.1268725930.23598.python-list@python.org>	<k88477-giu.ln1@satorlaser.homedns.org>	<4b9fdc50$0$22943$e4fe514c@news.xs4all.nl>	<mailman.870.1268772266.23598.python-list@python.org>
	<hnp5bh$paj$1@news.urz.uni-heidelberg.de>
Message-ID: <hnptvv$m4t$2@dough.gmane.org>

Michael Rudolf, 17.03.2010 00:48:
> Am 16.03.2010 21:44, schrieb Mark Lawrence:
>> Who actually *IS* running the time machine? Are there any bugs??
>
> My is. And as I'm a lazy hacker: sure. there are bugs. lets just call
> them features and move on. nothing to see here ;)

I'll know it, I'll just know it!

Stefan



From stefan_ml at behnel.de  Wed Mar 17 02:54:04 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 17 Mar 2010 07:54:04 +0100
Subject: C++ code generation
In-Reply-To: <11c0630.1732.12769d42e98.Coremail.dr.cg@126.com>
References: <11c0630.1732.12769d42e98.Coremail.dr.cg@126.com>
Message-ID: <hnpuac$m4t$3@dough.gmane.org>

CHEN Guang, 17.03.2010 02:54:
> ----- Original Message -----
> From: "Dan Goodman"<dg.gmane at thesamovar.net>
>
>> I'm doing some C++ code generation using Python, and would be interested
>> in any comments on the approach I'm taking.
>
> PythoidC ( http://pythoidc.googlecode.com ) is a C code generator (not C++)

It would be nice if you could start reading the posts before you answer, 
and then try to give an answer that fits the question.

Stefan



From sam at sambull.co.uk  Wed Mar 17 04:43:38 2010
From: sam at sambull.co.uk (Sam Bull)
Date: Wed, 17 Mar 2010 08:43:38 +0000
Subject: Timer
Message-ID: <1268815418.2682.31.camel@s-desktop>

I'm writing a pyGTK program, and I need to display the contents of a
window for a few seconds before automatically moving on. I have tried
using the time.sleep method, but this has problems, such as the program
becoming unresponsive.

I have now attempted to use a timer, but this does not seem to run the
function at the end of the time. The code of my latest attempt:

def next(self=None, testnum=10, testspeed=5):
    self.count += 1
    #Sets label, telling the user the next word to memorise
    self.nobtns.set_markup("Word %s is: %s" % (self.count,
self.words[self.count-1]))
    self.nobtns.show()
    if self.count == testnum: #When all words are shown
        self.nobtns.hide()
    else:
        self.timer = threading.Timer(testspeed, self.next, [testnum,
testspeed])
        self.timer.start()

Putting a print statement at the beginning of the function, I can see
that the function is not being run by the timer. Any help on getting
this working would be appreciated.

Thanks,
Sam Bull
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From anand.shashwat at gmail.com  Wed Mar 17 04:46:00 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Wed, 17 Mar 2010 14:16:00 +0530
Subject: using DictionaryServices module to get work with python2.6 
	#OSXspecific
Message-ID: <d4ab53de1003170146s7fe5e153mea5d61dd1060a19c@mail.gmail.com>

I wanted to use dictionary in my OSX terminal.
So I wrote a function dict() in my ~/.bash_profile

dict () {
    python2.5 -c 'import sys, DictionaryServices; word = "
".join(sys.argv[1:]); print DictionaryServices.DCSCopyTextDefinition(None,
word, (0, len(word)))' $@
}

here is the output:

Shashwat-Anands-MacBook-Pro:Desktop l0nwlf$ dict lone wolf
noun
a person who prefers to act or be alone.

The question is why not :
DictionaryServices.DCSCopyTextDefinition(None, word, (0, len(word))) works
with python2.6 ?
Is DictionaryService module not available for python2.6 ?

Here is the stack-trace:

Shashwat-Anands-MacBook-Pro:Desktop l0nwlf$ python
Python 2.6.1 (r261:67515, Jul  7 2009, 23:51:51)
[GCC 4.2.1 (Apple Inc. build 5646)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import DictionaryServices
>>> word = "lone wolf"
>>> DictionaryServices.DCSCopyTextDefinition(None, word, (0, len(word)))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: NSRangeException - *** -[OC_PythonString
_createSubstringWithRange:]: Range or index out of bounds
>>>

Ofcourse it doesnt work with python2.7 too. Is this OSX specific issue ? Can
I make it work with my compiled version of python ? Is there any workaround
?
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From grflanagan at gmail.com  Wed Mar 17 04:54:14 2010
From: grflanagan at gmail.com (Gerard Flanagan)
Date: Wed, 17 Mar 2010 08:54:14 +0000
Subject: Dynamic Class Creation
In-Reply-To: <8d79f0cb-9c5b-4243-8891-a15fb311f652@z18g2000prh.googlegroups.com>
References: <b05e819c-a005-49d4-b0e7-78be9a56b268@q2g2000pre.googlegroups.com>	<mailman.816.1268720338.23598.python-list@python.org>
	<8d79f0cb-9c5b-4243-8891-a15fb311f652@z18g2000prh.googlegroups.com>
Message-ID: <hnq5bn$d10$1@dough.gmane.org>

Josh English wrote:
> Chris,
> 
> Thanks. This worked for the attributes, but I think the tactic is
> still misleading. There are child elements I can't quite determine how
> to deal with:
> 
> <market code='anlg' tier='ProMarket' mail='True'>
>     <title field="pref">Analog Science Fiction and Fact</title>
>     <nickname>Analog</nickname>
>     <keyword>Science Fiction</keyword>
>     <keyword>First Contact</keyword>
>     <keyword>Hard Science Fiction</keyword>
>     <address>
>         <attnline>Stanley Schmidt, Editor</attnline>
>         <address1>267 Broadway, 4th Floor</address1>
>         <address2>New York, NY 10007-2352</address2>
>     </address>
>     <website>http://www.analogsf.com</website>
> </market>
> 
> A child element with text and an attribute or two, for example, pose a
> problem. I can call Market.title but should I try Market.title.field
> or Market.title_field.
> 
> Multiple elements, such as keywords, are allowed in xml but harder to
> map to the object. I don't know if I want to go create a list and
> methods for accessing those keywords as a list, or redefine the rules
> of my XML to not allow multiple child elements with the same tag. I
> can't decide.
> 
> Then the address is a bit of a bear.
> 
> In short, I have to figure out the whole object interface to the XML
> and how I want that to work.
> 


Have you heard of or considered PyXB (http://pyxb.sourceforge.net/)? Not 
that I've much experience with it, but you can use it to generate python 
code from XML Schema files, and, I think, WSDL definitions. It's a bit 
of a rabbit hole, but then isn't that half the fun!

The following might give you the idea. You start with a Schema 
schema.xsd, generate a python module from it, then read in some XML with 
the generated classes to get your custom objects.


---------------- schema.xsd ----------------------

<xs:schema targetNamespace="http://www.josh.com/schema/0.1"
         xmlns:xs="http://www.w3.org/2001/XMLSchema"
         xmlns:josh="http://www.josh.com/schema/0.1">


     <xs:element name="market" type="josh:MarketType"/>

     <xs:complexType name="MarketType">
         <xs:sequence>
             <xs:element name="title" type="josh:TitleType"/>
             <xs:element name="nickname" type="xs:string"/>
             <xs:element name="keyword" type="xs:string" 
maxOccurs="unbounded"/>
             <xs:element name="address" type="josh:USAddress"/>
             <xs:element name="website" type="xs:string"/>
         </xs:sequence>
         <xs:attributeGroup ref="josh:MarketAttributes"/>
     </xs:complexType>

     <xs:complexType name="TitleType">
         <xs:simpleContent>
             <xs:extension base="xs:string">
                 <xs:attribute name="field" type="xs:string"/>
             </xs:extension>
         </xs:simpleContent>
     </xs:complexType>

     <xs:attributeGroup name="MarketAttributes">
         <xs:attribute name="code" type="xs:string"/>
         <xs:attribute name="tier" type="xs:string"/>
         <xs:attribute name="mail" type="xs:string"/>
     </xs:attributeGroup>

     <xs:complexType name="Address" abstract="true">
         <xs:sequence>
             <xs:element name="name"   type="xs:string"/>
             <xs:element name="street" type="xs:string"/>
             <xs:element name="city"   type="xs:string"/>
         </xs:sequence>
     </xs:complexType>

     <xs:complexType name="USAddress">
         <xs:complexContent>
             <xs:extension base="josh:Address">
                 <xs:sequence>
                     <xs:element name="state" type="josh:USState" 
minOccurs="0"/>
                     <xs:element name="zip"   type="xs:positiveInteger" 
minOccurs="0"/>
                 </xs:sequence>
             </xs:extension>
         </xs:complexContent>
     </xs:complexType>

     <xs:simpleType name="USState">
         <xs:restriction base="xs:string">
             <xs:enumeration value="AK"/>
             <xs:enumeration value="AL"/>
             <xs:enumeration value="AR"/>
             <!-- and so on ... -->
         </xs:restriction>
     </xs:simpleType>

</xs:schema>

---------------- genbindings.sh ---------------------------

#!/bin/sh

pyxbgen -u schema.xsd -m market_binding -r

---------------- demo.py -----------------------------------

s = """<?xml version="1.0"?>
<josh:market
     xmlns:josh="http://www.josh.com/schema/0.1"
     code="anlg"
     tier="ProMarket"
     mail="True">

     <title field="pref">Analog Science Fiction and Fact</title>
     <nickname>Analog</nickname>
     <keyword>Science Fiction</keyword>
     <keyword>First Contact</keyword>
     <keyword>Hard Science Fiction</keyword>
     <address>
         <name>Stanley Schmidt, Editor</name>
         <street>267 Broadway, 4th Floor</street>
         <city>New York</city>
     </address>
     <website>http://www.analogsf.com</website>
</josh:market>
"""

import xml.dom.minidom
import market_binding

market = 
market_binding.CreateFromDOM(xml.dom.minidom.parseString(s).documentElement)

print market.tier
print market.code
print market.keyword
assert len(market.keyword) == 3
print market.address.name
print market.toxml()





From breamoreboy at yahoo.co.uk  Wed Mar 17 04:56:48 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Wed, 17 Mar 2010 08:56:48 +0000
Subject: using DictionaryServices module to get work with python2.6
	#OSXspecific
In-Reply-To: <d4ab53de1003170146s7fe5e153mea5d61dd1060a19c@mail.gmail.com>
References: <d4ab53de1003170146s7fe5e153mea5d61dd1060a19c@mail.gmail.com>
Message-ID: <hnq5gi$dal$1@dough.gmane.org>

Shashwat Anand wrote:
> I wanted to use dictionary in my OSX terminal.
> So I wrote a function dict() in my ~/.bash_profile
> 
> dict () {
>     python2.5 -c 'import sys, DictionaryServices; word = "
> ".join(sys.argv[1:]); print DictionaryServices.DCSCopyTextDefinition(None,
> word, (0, len(word)))' $@
> }
> 
> here is the output:
> 
> Shashwat-Anands-MacBook-Pro:Desktop l0nwlf$ dict lone wolf
> noun
> a person who prefers to act or be alone.
> 
> The question is why not :
> DictionaryServices.DCSCopyTextDefinition(None, word, (0, len(word))) works
> with python2.6 ?
> Is DictionaryService module not available for python2.6 ?
> 
> Here is the stack-trace:
> 
> Shashwat-Anands-MacBook-Pro:Desktop l0nwlf$ python
> Python 2.6.1 (r261:67515, Jul  7 2009, 23:51:51)
> [GCC 4.2.1 (Apple Inc. build 5646)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import DictionaryServices
>>>> word = "lone wolf"
>>>> DictionaryServices.DCSCopyTextDefinition(None, word, (0, len(word)))
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> IndexError: NSRangeException - *** -[OC_PythonString
> _createSubstringWithRange:]: Range or index out of bounds
> 
> Ofcourse it doesnt work with python2.7 too. Is this OSX specific issue ? Can
> I make it work with my compiled version of python ? Is there any workaround
> ?
> 
> 

Are you thinking of this?
http://pypi.python.org/pypi/pyobjc-framework-DictionaryServices/2.2

HTH.

Mark Lawrence



From Ron.Barak at lsi.com  Wed Mar 17 04:58:47 2010
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Wed, 17 Mar 2010 08:58:47 +0000
Subject: How to add a library path to pythonpath ?
In-Reply-To: <4B9FB09A.7030609@ieee.org>
References: <mailman.62.1268737204.24845.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>
	<1fb1c371003160527q10add6bfk75c09b24bc486329@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C883@enbmail01.lsi.com>
	<4B9F9DD0.2080306@ieee.org>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C894@enbmail01.lsi.com>
	<4B9FB09A.7030609@ieee.org>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF684F3C8DF@enbmail01.lsi.com>



> -----Original Message-----
> From: Dave Angel [mailto:davea at ieee.org]
> Sent: Tuesday, March 16, 2010 6:24 PM
> To: Barak, Ron
> Cc: Pablo Recio Quijano; python-list at python.org
> Subject: Re: How to add a library path to pythonpath ?
>
> Barak, Ron wrote:
> >
> >> -----Original Message-----
> >> From: Dave Angel [mailto:davea at ieee.org]
> >> Sent: Tuesday, March 16, 2010 5:04 PM
> >> To: Barak, Ron
> >> Cc: Pablo Recio Quijano; python-list at python.org
> >> Subject: RE: How to add a library path to pythonpath ?
> >>
> >>
> >>
> >> Barak, Ron wrote:
> >>
> >>> Thanks for the suggestion Pable.
> >>>
> >>> However, I really need the $PYTHONPATH to include this
> >>>
> >> additional library, so all Python scripts could use it.
> >>
> >>> In Windows I have defined PYTHONPATH as
> >>> c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\, and
> also in the
> >>> Windows registry I have
> >>>
> >>>
> >>>
> >>
> HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\version\PythonPath\ as
> >>
> >>
> C:\Python26\Lib;C:\Python26\DLLs;C:\views\cc_view\TS_svm_ts_tool\SVMI
> >> n
> >>
> >>> spector\lib\;C:\Python26\Lib\lib-tk;
> >>>
> >>> However, even with all the above, the SVMInspecor modules
> >>>
> >> are not found.
> >>
> >>>
> >> See my response at the end.  Top-posting makes for a very
> confusing
> >> thread.
> >>
> >>> <snip>
> >>>
> >>> 2010/3/16 Barak, Ron <Ron.Barak at lsi.com<mailto:Ron.Barak at lsi.com>>
> >>>
> >>> Hi,
> >>>
> >>> I'm trying to add a library path to my pythonpath, but
> >>>
> >> seems it is not
> >>
> >>> accepted -
> >>>
> >>> On Windows DOS window:
> >>>
> >>> C:\>echo %PYTHONPATH%
> >>> c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\
> >>>
> >>> C:\>python -c "import sys ; print sys.path"
> >>> ['', 'c:\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
> >>> 'C:\\WINDOWS\\syst em32\\python26.zip', 'C:\\Python26\\DLLs',
> >>> 'C:\\Python26\\lib', 'C:\\Python26\\l ib\\plat-win',
> >>> 'C:\\Python26\\lib\\lib-tk', 'C:\\Python26', 'C:\\Python26\\lib\\
> >>> site-packages',
> >>> 'C:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
> >>>
> >>> C:\>
> >>>
> >>> On Windows cygwin:
> >>>
> >>> $ echo $PYTHONPATH
> >>> .:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
> >>>
> >>> $ python -c "import sys ; print sys.path"
> >>> ['',
> >>>
> >>>
> >>
> '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
> >>
> >>> 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs',
> >>> 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win',
> >>> 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26',
> >>> 'c:\\Python26\\lib\\site-packages',
> >>> 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
> >>>
> >>> $
> >>>
> >>> What am I doing wrong ?
> >>>
> >>> Thanks,
> >>> Ron.
> >>>
> >>>
> >>>
> >>>
> >> In your original message, what you displayed worked exactly as
> >> expected.  As you didn't say what made you think something
> was wrong,
> >> I ignored the message.
> >>
> >> Now, you say that some modules are not found.  So how about giving
> >> some more specifics so someone can actually debug the
> problem.  Pick
> >> a particular module, tell us the complete path to that module, and
> >> show us both the sys.path strings (which look correct for
> the Windows
> >> case, and of course bogus for the cygwin case), as well as the
> >> offending import statement and its traceback.
> >>
> >> DaveA
> >>
> >
> > Hi Dave,
> >
> > My Python is the Windows Python (I need this for wxPython):
> >
> > $ ls -ls `which python`
> > 1 lrwxrwxrwx 1 rbarak mkgroup-l-d 31 Mar  4 14:02
> /usr/bin/python ->
> > /cygdrive/c/Python26/python.exe
> >
> > Here's a demo script:
> >
> > #!/usr/bin/env python
> >
> > import sys
> > print "\n",sys.path,"\n"
> >
> > from ErrorManager.ErrorManager import ErrorManager
> >
> > And it's run produces:
> >
> > $ python -u  tmp.py
> >
> > ['c:\\views\\cc_view\\TS_svm_ts_tool\\svm_ts_tool',
> >
> '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
> > 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs',
> > 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win',
> > 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26',
> > 'c:\\Python26\\lib\\site-packages',
> > 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
> >
> > Traceback (most recent call last):
> >   File "tmp.py", line 6, in <module>
> >     from ErrorManager.ErrorManager import ErrorManager
> > ImportError: No module named ErrorManager.ErrorManager
> >
> > $ ls -ls
> >
> /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/ErrorManager
> > /ErrorManager.py
> > 4 -rwxr-xr-x 1 rbarak ???????? 1843 Sep 21 19:16
> >
> /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/ErrorManager
> > /ErrorManager.py
> >
> > $ grep ErrorManager
> > /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
> > ErrorManager/ErrorManager.py
> > class ErrorManager:
> >
> > $ echo $PYTHONPATH
> > .:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
> >
> > Please let me know if the above is enough, or you'd like to
> see the results from a Windows' DOS window.
> >
> > Thanks,
> > Ron.
> >
> >
> Well, I pointed out that your cygwin path is bogus, so of
> course it won't work.  One of those entries is
>
>
> '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib'
>
> I use Linux, and I use Windows.  But cygwin's glomming
> together has never made sense;  some things are Unix-like,
> and others are Windows-like.  So anything you do in that
> environment is beyond me.
>
> If I had to guess, though I'd say you wanted to drop those
> first two characters from your PYTHONPATH.  If you really
> wanted two directories there, you should be separating them
> with semicolon (Windows rules), rather than colon (Linux
> rules).  First thing I'd do to test my theories is to print
> something like:
>      print sys.path[1]
>      print os.listdir(sys.path[1])
> Does Python even see the cygwin view of the world ?
>
> You also don't show the location of the module you're trying
> to import.
> I'm guessing that it's at
> ...SVMInspector/lib/ErrorManager/ErrorManager.py
> Do you have a file
> ...SVMInspector/lib/ErrorManager/__init__.py     ?
>
> I would seriously recommend against naming your package, your
> module, and your class all the same thing.  Makes debugging
> very hard.  At least make them have different case combinations.
>
> DaveA
>
>

Hi Dave,
With the suggestions you made above, I managed to solve the problems I reported, and now my paths work as expected.
Thanks a lot,
Ron.

$ cat tmp.py
#!/usr/bin/env python

import sys
import os
print "sys.path:",sys.path
print "sys.path[1]:",sys.path[1]
print "os.listdir(sys.path[1]):",os.listdir(sys.path[1])

from ErrorManager.ErrorManager import ErrorManager

$ python -u tmp.py
sys.path: ['c:\\views\\cc_view\\TS_svm_ts_tool\\svm_ts_tool', 'c:\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib', 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs', 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win', 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26', 'c:\\Python26\\lib\\site-packages', 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
sys.path[1]: c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib
os.listdir(sys.path[1]): ['ConnectivityManager', 'ErrorManager', 'Utility']

$ echo $PYTHONPATH
c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\

$ echo  $PYTHON_PATH
c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\
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From mikelisanke at gmail.com  Wed Mar 17 05:08:18 2010
From: mikelisanke at gmail.com (MikeLisanke@gmail.com)
Date: Wed, 17 Mar 2010 02:08:18 -0700 (PDT)
Subject: Python bindings tutorial
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>
	<mailman.863.1268766752.23598.python-list@python.org>
Message-ID: <98447f7e-64db-4a10-b19e-685f5b079cf6@l25g2000yqd.googlegroups.com>

On Mar 16, 3:12?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Tue, 16 Mar 2010 13:20:40 -0300, Johny <pyt... at hope.cz> escribi?:
>
> > Is there any tutorial how to write a bindings for a exe ( dos)
> > program?
> > I would like to run it from a Python directly
> > ( using import command and a particular function from the binding)
> > ?not using os.system command.
>
> Do you mean that you want to execute a particular function in the .exe ?
> program?
> That's not possible (ok, you *could* do that if you work hard enough, but ?
> that's not how things are usually done)
>
> --
> Gabriel Genellina

Gabriel,

Its interesting you've mentioned the hard work involved in this
interface (binding to an EXE instead of a DLL). A year or more ago I
was looking at interfacing IPMITOOL to python. Do to the problems
incurred with swig/python I switched to a running the process through
its command-line interface. I always felt the problems in interfacing
python to an EXE should be worked on (to minimize them), making the
direct use of an EXE API's a routine task. I understand some of the
problems using an EXE (not running all of its startup code   but
enough for its proper operation). Have you found this a recurring
question? Thanks.

Regards, Mike


From Neil.Blue at biowisdom.com  Wed Mar 17 05:12:33 2010
From: Neil.Blue at biowisdom.com (Neil Blue)
Date: Wed, 17 Mar 2010 09:12:33 -0000
Subject: How to handle file uploads with http.server
In-Reply-To: <op.u9ov64scx6zn5v@lepton.softlabbsas.com.ar>
References: <91ad5bf81003110221m5e383f8fkc7959aa2887927eb@mail.gmail.com><4728DC0EADB2654E8BA2A487F0CF2785AD6D2E@ws-ukexchange.internal.biowisdom.com>
	<op.u9ov64scx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <4728DC0EADB2654E8BA2A487F0CF2785AD6D3E@ws-ukexchange.internal.biowisdom.com>

Thanks Gabriel

Yep, that looks like the same one. 

Cheers
Neil

 

-----Original Message-----
From: Gabriel Genellina [mailto:gagsl-py2 at yahoo.com.ar] 
Sent: 17 March 2010 02:08
To: python-list at python.org
Subject: Re: How to handle file uploads with http.server

En Thu, 11 Mar 2010 07:30:24 -0300, Neil Blue <Neil.Blue at biowisdom.com>
escribi?:

> I have a basic http.server instance running (class 
> HTTPHandler(http.server.BaseHTTPRequestHandler), with python 3.1, and 
> I would like to upload files with multipart forms.
>
> def do_POST(self):
> 	ctype, pdict = cgi.parse_header(self.headers['Content-Type'])
> 	if ctype=='multipart/form-data':
> 		print('parsing...')
> 		query=cgi.parse_multipart(self.rfile, pdict)
> 		print(query)
>
> However the file never seems to finish being parsed. There are no 
> errors, but the call hangs at: query=cgi.parse_multipart(self.rfile, 
> pdict)

This may be related to this bug:

http://bugs.python.org/issue8077

reported last week by Mitchell L. Model in this thread:

http://groups.google.com/group/comp.lang.python/t/8a7752bd79d5f5d6/

--
Gabriel Genellina



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From bruno.42.desthuilliers at websiteburo.invalid  Wed Mar 17 05:12:54 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 17 Mar 2010 10:12:54 +0100
Subject: to pass self or not to pass self
In-Reply-To: <4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com>
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org>
	<4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com>
Message-ID: <4ba09d09$0$21466$426a74cc@news.free.fr>

Patrick Maupin a ?crit :
> On Mar 16, 1:59 pm, Jason Tackaberry <t... at urandom.ca> wrote:
>> Why not create the bound methods at instantiation time, rather than
>> using the descriptor protocol which has the overhead of creating a new
>> bound method each time the method attribute is accessed?
> 
> Well, for one thing, Python classes are open.  They can be added to at
> any time.  For another thing, you might not ever use most of the
> methods of an instance, so it would be a huge waste to create those.

A possible optimization would be a simple memoization on first access.



From __peter__ at web.de  Wed Mar 17 05:16:17 2010
From: __peter__ at web.de (Peter Otten)
Date: Wed, 17 Mar 2010 10:16:17 +0100
Subject: Timer
References: <mailman.889.1268815865.23598.python-list@python.org>
Message-ID: <hnq6ka$gqr$00$1@news.t-online.com>

Sam Bull wrote:

> I'm writing a pyGTK program, and I need to display the contents of a
> window for a few seconds before automatically moving on. I have tried
> using the time.sleep method, but this has problems, such as the program
> becoming unresponsive.
> 
> I have now attempted to use a timer, but this does not seem to run the
> function at the end of the time. The code of my latest attempt:
> 
> def next(self=None, testnum=10, testspeed=5):
>     self.count += 1
>     #Sets label, telling the user the next word to memorise
>     self.nobtns.set_markup("Word %s is: %s" % (self.count,
> self.words[self.count-1]))
>     self.nobtns.show()
>     if self.count == testnum: #When all words are shown
>         self.nobtns.hide()
>     else:
>         self.timer = threading.Timer(testspeed, self.next, [testnum,
> testspeed])
>         self.timer.start()
> 
> Putting a print statement at the beginning of the function, I can see
> that the function is not being run by the timer. Any help on getting
> this working would be appreciated.

GUI toolkits usually have their own way of handling timeouts. I don't know 
pygtk, but the following looks promising:

http://www.pygtk.org/pygtk2tutorial/ch-TimeoutsIOAndIdleFunctions.html

Peter


From anand.shashwat at gmail.com  Wed Mar 17 05:18:06 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Wed, 17 Mar 2010 14:48:06 +0530
Subject: using DictionaryServices module to get work with python2.6 
	#OSXspecific
In-Reply-To: <hnq5gi$dal$1@dough.gmane.org>
References: <d4ab53de1003170146s7fe5e153mea5d61dd1060a19c@mail.gmail.com> 
	<hnq5gi$dal$1@dough.gmane.org>
Message-ID: <d4ab53de1003170218n139f228raa650a6b8f61de5e@mail.gmail.com>

> Are you thinking of this?
> http://pypi.python.org/pypi/pyobjc-framework-DictionaryServices/2.2
>

I get the same IndexError while working with  this wrapper. My guess is
python2.6 does not support DictionaryServices on Snow Leopard
.
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From stefan_ml at behnel.de  Wed Mar 17 05:36:29 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 17 Mar 2010 10:36:29 +0100
Subject: Python bindings tutorial
In-Reply-To: <98447f7e-64db-4a10-b19e-685f5b079cf6@l25g2000yqd.googlegroups.com>
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>	<mailman.863.1268766752.23598.python-list@python.org>
	<98447f7e-64db-4a10-b19e-685f5b079cf6@l25g2000yqd.googlegroups.com>
Message-ID: <hnq7qt$kl0$1@dough.gmane.org>

MikeLisanke at gmail.com, 17.03.2010 10:08:
> Its interesting you've mentioned the hard work involved in this
> interface (binding to an EXE instead of a DLL). A year or more ago I
> was looking at interfacing IPMITOOL to python. Do to the problems
> incurred with swig/python I switched to a running the process through
> its command-line interface. I always felt the problems in interfacing
> python to an EXE should be worked on (to minimize them), making the
> direct use of an EXE API's a routine task. I understand some of the
> problems using an EXE (not running all of its startup code   but
> enough for its proper operation). Have you found this a recurring
> question? Thanks.

I think the point here is that executable binaries are not supposed to be 
used as libraries. Libraries are. That's the difference between a DLL and 
an executable in the first place. To run an executable, execute it. The 
subprocess module is the tool of choice here. To use a DLL, link against it.

Stefan



From dr.cg at 126.com  Wed Mar 17 05:41:55 2010
From: dr.cg at 126.com (CHEN Guang)
Date: Wed, 17 Mar 2010 17:41:55 +0800 (CST)
Subject: C++ code generation
Message-ID: <24b7e9.8952.1276b803126.Coremail.dr.cg@126.com>

>> ----- Original Message -----
>> From: "Dan Goodman"<dg.gmane at thesamovar.net>
>>
>>> I'm doing some C++ code generation using Python, and would be interested
>>> in any comments on the approach I'm taking.
>>
>> PythoidC ( http://pythoidc.googlecode.com ) is a C code generator (not C++)
> 
> It would be nice if you could start reading the posts before you answer, 
> and then try to give an answer that fits the question.
> 
> Stefan
 
I have read the post, may be I lost some words and made you misunderstand. I meant:
PythoidC ( http://pythoidc.googlecode.com ) is a C code generator (but not C++), if you find it useful, 
welcome to take a look.
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From Ron.Barak at lsi.com  Wed Mar 17 06:25:58 2010
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Wed, 17 Mar 2010 10:25:58 +0000
Subject: How to add a library path to pythonpath ?
In-Reply-To: <4BA01D6A.60208@gmail.com>
References: <mailman.62.1268737204.24845.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>
	<1fb1c371003160527q10add6bfk75c09b24bc486329@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C883@enbmail01.lsi.com>
	<4BA01D6A.60208@gmail.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF684F3C8FE@enbmail01.lsi.com>

 

> -----Original Message-----
> From: Mark Hammond [mailto:skippy.hammond at gmail.com] 
> Sent: Wednesday, March 17, 2010 2:08 AM
> To: Barak, Ron
> Cc: Pablo Recio Quijano; python-list at python.org
> Subject: Re: How to add a library path to pythonpath ?
> 
> On 17/03/2010 1:26 AM, Barak, Ron wrote:
> > Thanks for the suggestion Pable.
> > However, I really need the $PYTHONPATH to include this additional 
> > library, so all Python scripts could use it.
> > In Windows I have defined PYTHONPATH as 
> > c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\, and also in the 
> > Windows registry I have 
> > 
> HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\/version/\Python
> Path\ as 
> > 
> C:\Python26\Lib;C:\Python26\DLLs;C:\views\cc_view\TS_svm_ts_tool\SVMIn
> > spector\lib\;C:\Python26\Lib\lib-tk;
> > However, even with all the above, the SVMInspecor modules 
> are not found.
> 
> You need to create your own sub-key, with any name, under the 
> PythonPath key and add your path there.  The reason is that 
> Python only looks for that root key when it can't sniff the 
> location of the library itself based on the location of the 
> executable - and in most cases it can. 
> Python does however enumerate and use the sub-keys in all cases.
> 
> HTH,
> 
> Mark
> 

Hi Mark,
Could you give an example ilustrating your suggestion ?
Thanks,
Ron.

From lie.1296 at gmail.com  Wed Mar 17 06:41:50 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Wed, 17 Mar 2010 21:41:50 +1100
Subject: to pass self or not to pass self
In-Reply-To: <pan.2010.03.17.05.32.04@REMOVE.THIS.cybersource.com.au>
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>	<4b9f4984$0$10229$426a74cc@news.free.fr>	<mailman.860.1268765949.23598.python-list@python.org>	<4ba06148$1@dnews.tpgi.com.au>
	<pan.2010.03.17.05.32.04@REMOVE.THIS.cybersource.com.au>
Message-ID: <4ba0b20e$1@dnews.tpgi.com.au>

On 03/17/2010 04:32 PM, Steven D'Aprano wrote:
> On Wed, 17 Mar 2010 15:57:17 +1100, Lie Ryan wrote:
> 
>> Most people probably would never need to use
>> descriptor protocol directly, since the immediate benefit of descriptor
>> protocol are property(), classmethod(), and instancemethod() decorators
>> which, without descriptor protocol, would never become a possibility.
> 
> 
> There's an instancemethod decorator? Where?
> 
> Are you thinking of staticmethod? "instancemethod", if you mean what I 
> think you mean, doesn't need a decorator because it is the default 
> behaviour for new-style classes.

Whoops... yep, sorry about that. Got all it up the mixed head in...


From chambon.pascal at gmail.com  Wed Mar 17 06:42:44 2010
From: chambon.pascal at gmail.com (Pakal)
Date: Wed, 17 Mar 2010 03:42:44 -0700 (PDT)
Subject: Castrated traceback in sys.exc_info()
Message-ID: <7866674b-46ba-49e2-9d76-e8259ba22df0@z3g2000yqz.googlegroups.com>

Hello

I've just realized recently that sys.exc_info() didn't return a full
traceback for exception concerned : it actually only contains the
frame below the point of exception catching.

That's very annoying to me, because I planned to log such tracebacks
with logging.critical(*****, exc_info=True), and these partial
tracebacks, like the one below, are clearly unsufficient to determine
where the problem comes from. A whole traceback, from program entry
point to exception raising point, would be much better.

2010-03-17 09:28:59,184 - pims - CRITICAL - This is just a test to
ensure critical emails are properly sent
Traceback (most recent call last):
<< HERE, lots of frames missing >>
  File "test_common.py", line 34, in test_email_sending
    os.open("qsdsdqsdsdqsd", "r")
TypeError: an integer is required

Is there any workaround for this ? I've thought about a custom logging
formatter, which would take both the exc_info traceback AND its own
full backtrace, and to connect them together on their relevant part,
but it's awkward and error prone... why can't we just have all the
precious traceback info under the hand there (an additional attribute
might have pointed the precise frame in which the exception was
caught).

Tanks for the attention,
Regards,
Pascal


From davea at ieee.org  Wed Mar 17 06:55:38 2010
From: davea at ieee.org (Dave Angel)
Date: Wed, 17 Mar 2010 05:55:38 -0500
Subject: datetime string conversion error
In-Reply-To: <op.u9ow1cd4x6zn5v@lepton.softlabbsas.com.ar>
References: <8cebc349-33d5-4820-a944-2e6869408f0f@c34g2000pri.googlegroups.com>	<f1829de4-43d9-4e14-b9ea-9ee170358641@k24g2000pro.googlegroups.com>
	<op.u9ow1cd4x6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <4BA0B52A.10708@ieee.org>



Gabriel Genellina wrote:
> En Tue, 16 Mar 2010 20:31:11 -0300, Josh English 
> <joshua.r.english at gmail.com> escribi?:
>
>> On Mar 16, 11:56 am, Jordan Apgar <twistedphr... at gmail.com> wrote:
>>
>>> here's what I'm doing:
>>> date = "2010-03-16 14:46:38.409137"
>>>  olddate = datetime.strptime(date,"%Y-%m-%j %H:%M:%S.%f")
>>>
>>
>> Due to circumstances, I'm using Python 2.5.4 on one machine (2.6 on
>> the other).
>>
>> When I have a script as simple as this:
>>
>> import datetime
>>
>> datetime.datetime.strptime('2010-09-14', "%Y-%m-%d")
>>
>>
>> Running this script brings up a calendar, believe it or not. The
>> calendar displays March 2010, and shows the 22nd as a holiday. When I
>> dismiss the dialog box I get:
>> Traceback (most recent call last):
>>   File "strptimetest.py", line 3, in <module>
>>     datetime.datetime.strptime('2010-09-14', "%Y-%m-%d")
>>   File "C:\Python25\lib\_strptime.py", line 272, in <module>
>>     _TimeRE_cache = TimeRE()
>>   File "C:\Python25\lib\_strptime.py", line 191, in __init__
>>     self.locale_time = LocaleTime()
>>   File "C:\Python25\lib\_strptime.py", line 74, in __init__
>>     self.__calc_weekday()
>>   File "C:\Python25\lib\_strptime.py", line 94, in __calc_weekday
>>     a_weekday = [calendar.day_abbr[i].lower() for i in range(7)]
>> AttributeError: 'module' object has no attribute 'day_abbr'
>
> I'd say you have a calendar.py script somewhere along your sys.path, 
> that shadows the calendar module in the standard library.
>
And to find it, you could try the following:

import datetime
print calendar.__file__

I suspect you have more problems than just that file, but perhaps 
finding that one can tell you what extra package you've got installed 
that shadows parts of the standard library.  Try temporarily renaming it 
to see if the problem goes away.

DaveA



From davea at ieee.org  Wed Mar 17 07:14:13 2010
From: davea at ieee.org (Dave Angel)
Date: Wed, 17 Mar 2010 06:14:13 -0500
Subject: Python bindings tutorial
In-Reply-To: <hnq7qt$kl0$1@dough.gmane.org>
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>	<mailman.863.1268766752.23598.python-list@python.org>	<98447f7e-64db-4a10-b19e-685f5b079cf6@l25g2000yqd.googlegroups.com>
	<hnq7qt$kl0$1@dough.gmane.org>
Message-ID: <4BA0B985.3060501@ieee.org>

Stefan Behnel wrote:
> <div class="moz-text-flowed" style="font-family: 
> -moz-fixed">MikeLisanke at gmail.com, 17.03.2010 10:08:
>> Its interesting you've mentioned the hard work involved in this
>> interface (binding to an EXE instead of a DLL). A year or more ago I
>> was looking at interfacing IPMITOOL to python. Do to the problems
>> incurred with swig/python I switched to a running the process through
>> its command-line interface. I always felt the problems in interfacing
>> python to an EXE should be worked on (to minimize them), making the
>> direct use of an EXE API's a routine task. I understand some of the
>> problems using an EXE (not running all of its startup code   but
>> enough for its proper operation). Have you found this a recurring
>> question? Thanks.
>
> I think the point here is that executable binaries are not supposed to 
> be used as libraries. Libraries are. That's the difference between a 
> DLL and an executable in the first place. To run an executable, 
> execute it. The subprocess module is the tool of choice here. To use a 
> DLL, link against it.
>
> Stefan
>
There's no real reason parts of an exe cannot be exported, same as a 
dll.  They are in fact the same structure.  And in fact many other files 
in the Windows environment are also the same structure, from fonts to ocx's

Saying they're "not supposed to be used" is like saying that a python 
module should not have an

if __name__ == "__main__":

section.  After all, who could want to both run a file, and import the 
same file??

DaveA



From hatem.oraby at gmail.com  Wed Mar 17 07:26:33 2010
From: hatem.oraby at gmail.com (Hatem Oraby)
Date: Wed, 17 Mar 2010 13:26:33 +0200
Subject: Swapping Content of Two Dictionaries.
In-Reply-To: <779ea7fb1003160146t6fe79d6erc6dc12ea7452f6b3@mail.gmail.com>
References: <779ea7fb1003160146t6fe79d6erc6dc12ea7452f6b3@mail.gmail.com>
Message-ID: <779ea7fb1003170426o3dff6f06lade4b90c6a81f265@mail.gmail.com>

Hello, I want to swap the content of two dictionaries, the obvious way to do
it is:
a = {1:"I'am A"}
b = {2:"I'm B"}
temp = a
a = b
b = temp

However, consider the case in which the dictionary we are referencing lives
in another module:
#external.py
#
#a = {1:"I'am A}
import external

temp = external.a
external.a = b
b = temp

Well, still this would work great and anyone later that would refereence
external.a would find the content of b, but consider the case where someone
else imported "external.py" before my module run, for example:
#external.py
#
#a = {1:"I'm A}

#annoyer.py
#from external import a
#
# #Do other stuff with a
import external

temp = external.a
external.a = b
b = temp

Now in such case when I overwrite the content of external.a in my module,
the change in dictionary is not reflected in annoyer module, that's because
annoyer hold a reference to the original a but not the new one. annoyer
module still see the old content of a.

The workaround that i did to solve this problem is the following (I'm
simplifying it right here):

tempKeys = a.keys()
diffKeys = a.keys()  - b.keys()   #I do it using set()s

#item = a
temp = {}
for key in a.keys():
   item[key] = a[key]

for key in diffKeys:
    del a[key] #delete stuff that exist in a but not b.

for key in b.keys():
    a[key] = b[key]

b = temp

This works great as the content referenced by the dictionary is changed
rather than changing the reference of dictionary itself so it's reflected by
any "scope" that references the dictionary.

My problem is that i need to do this operation a LOT, simply I got a problem
that my program go through a very long loop and inside this loop this
operation is needed to be done twice and the dictionary size ain't very
small.

If anyone has a suggestion one how to do it faster then please feel free and
welcome to contribute.

Anyway, I decided to go and implement it in C to gain performance, And since
I got no expereince in writing C extension I'm not really sure if what I'm
doing right or wrong, long story short here is what i decided to do:
In real python (I mean not the C code) an object is mainly a reference to a
C PyObject (or an inheritance of the PyObject).
Python dictionaries are represented as PyDictObject (PyDictObject inherits
PyObject), so every Python Dictionary is a reference to PyDictObject,

So what i came up with to swap two Python dictionaries is to swap the
content of PyDictObjects of the dictionaries, I know that "illegal" way of
doing things in Python but I need the hack to gain performance.

I opened up python source files:
object.h (extracted the definition of PyObject)
dictObject.g (extctracted the definition of PyDictObject)

And I've written the following C extension:


   1. #include <Python.h>
   2. #include <dictobject.h> //I know that it was already imported
   3.
   4. static char swap_doc[] =
   5. "My try to swap dicts, isa hopefully it will work good.";
   6.
   7.
   8. static PyObject*
   9. swap_swapDict(PyObject *self, PyObject *args)
   10. {
   11.         PyObject *a, *b;
   12.         PyDictObject *x, *y;
   13.         //Temp PyDictObject attriubutes
   14.         Py_ssize_t ob_refcnt;
   15.         PyTypeObject *ob_type;
   16.         Py_ssize_t ma_fill;
   17.         Py_ssize_t ma_used;
   18.         Py_ssize_t ma_mask;
   19.         PyDictEntry *ma_table;
   20.         PyDictEntry *(*ma_lookup)(PyDictObject *mp, PyObject *key,
   long hash);
   21.         PyDictEntry *ma_smalltable;//[PyDict_MINSIZE];
   22.
   23.
   24.         if (!PyArg_UnpackTuple(args, "swapDict", 2, 2, &a, &b)) {
   25.                 return NULL;
   26.         }
   27.
   28.         //Make sure that they are dictionaries
   29.         if (!PyDict_Check(a) && !PyDict_Check(b)) {
   30.                 PyErr_SetString(PyExc_TypeError,
   31.                                 "dictionary required, something else
   was passed");
   32.                 return NULL;
   33.         }
   34.
   35.         x = (PyDictObject*)a;
   36.         y = (PyDictObject*)b;
   37.
   38.         ob_refcnt = x->ob_refcnt;
   39.         x->ob_refcnt = y->ob_refcnt;
   40.         y->ob_refcnt = ob_refcnt;
   41.
   42.         ob_type = x->ob_type;
   43.         x->ob_type = y->ob_type;
   44.         y->ob_type = ob_type;
   45.
   46.         ma_fill = x->ma_fill;
   47.         x->ma_fill = y->ma_fill;
   48.         y->ma_fill = ma_fill;
   49.
   50.         ma_used = x->ma_used;
   51.         x->ma_used = y->ma_used;
   52.         y->ma_used = ma_used;
   53.
   54.         ma_mask = x->ma_mask;
   55.         x->ma_mask = y->ma_mask;
   56.         y->ma_mask = ma_mask;
   57.
   58.         ma_table = x->ma_table;
   59.         x->ma_table = y->ma_table;
   60.         y->ma_table = ma_table;
   61.
   62.         ma_lookup = x-> ma_lookup;
   63.         x->ma_lookup = y-> ma_lookup;
   64.         y->ma_lookup = ma_lookup;
   65.
   66.         ma_smalltable = x->ma_smalltable;
   67.         *(x->ma_smalltable) = *(y->ma_smalltable);
   68.         *(y->ma_smalltable) = *(ma_smalltable);
   69.
   70.         return Py_None;
   71. }
   72.
   73. //This is extracted form dictObject.h and object.h
   74. //typedef struct _dictobject PyDictObject;
   75. //struct _dictobject {
   76. //      PyObject_HEAD
   77. //      Py_ssize_t ma_fill;  /* # Active + # Dummy */
   78. //      Py_ssize_t ma_used;  /* # Active */
   79. //
   80. //      /* The table contains ma_mask + 1 slots, and that's a power
   of 2.
   81. //       * We store the mask instead of the size because the mask is
   more
   82. //       * frequently needed.
   83. //       */
   84. //      Py_ssize_t ma_mask;
   85. //
   86. //      /* ma_table points to ma_smalltable for small tables, else to
   87. //       * additional malloc'ed memory.  ma_table is never NULL!
   This rule
   88. //       * saves repeated runtime null-tests in the workhorse getitem
   and
   89. //       * setitem calls.
   90. //       */
   91. //      PyDictEntry *ma_table;
   92. //      PyDictEntry *(*ma_lookup)(PyDictObject *mp, PyObject *key,
   long hash);
   93. //      PyDictEntry ma_smalltable[PyDict_MINSIZE];
   94. //};
   95. //PyObject_Head is a simple two statements equal to:
   96. //Py_ssize_t ob_refcnt;
   97. //struct _typeobject *ob_type;
   98.
   99. static char swap_swapDict_doc[] =
   100. "Replaces two dicts with each other.";
   101.
   102. static PyMethodDef swap_methods[] = {
   103.         {"swapDict", swap_swapDict, METH_VARARGS, swap_swapDict_doc}
   ,
   104.         {NULL, NULL}
   105. };
   106.
   107. PyMODINIT_FUNC
   108. initswap(void)
   109. {
   110.         Py_InitModule3("swap", swap_methods, swap_doc);
   111. }



What the code mainly do is that it swap the content of the PyDict objects.
However I got a bug where one of them swaps correctly while the other points
to a displaced memory location.
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From michael.ricordeau at gmail.com  Wed Mar 17 07:40:19 2010
From: michael.ricordeau at gmail.com (Michael Ricordeau)
Date: Wed, 17 Mar 2010 12:40:19 +0100
Subject: Castrated traceback in sys.exc_info()
In-Reply-To: <7866674b-46ba-49e2-9d76-e8259ba22df0@z3g2000yqz.googlegroups.com>
References: <7866674b-46ba-49e2-9d76-e8259ba22df0@z3g2000yqz.googlegroups.com>
Message-ID: <20100317124019.7013dfa3@moriz.interne>

Hi,

to log tracebacks, you can probably try traceback module.

I use it like this :

import traceback
.... #?your code

for line in traceback.format_exc().splitlines():
  log.trace(line)



Le Wed, 17 Mar 2010 03:42:44 -0700 (PDT),
Pakal <chambon.pascal at gmail.com> a ?crit :

> Hello
> 
> I've just realized recently that sys.exc_info() didn't return a full
> traceback for exception concerned : it actually only contains the
> frame below the point of exception catching.
> 
> That's very annoying to me, because I planned to log such tracebacks
> with logging.critical(*****, exc_info=True), and these partial
> tracebacks, like the one below, are clearly unsufficient to determine
> where the problem comes from. A whole traceback, from program entry
> point to exception raising point, would be much better.
> 
> 2010-03-17 09:28:59,184 - pims - CRITICAL - This is just a test to
> ensure critical emails are properly sent
> Traceback (most recent call last):
> << HERE, lots of frames missing >>
>   File "test_common.py", line 34, in test_email_sending
>     os.open("qsdsdqsdsdqsd", "r")
> TypeError: an integer is required
> 
> Is there any workaround for this ? I've thought about a custom logging
> formatter, which would take both the exc_info traceback AND its own
> full backtrace, and to connect them together on their relevant part,
> but it's awkward and error prone... why can't we just have all the
> precious traceback info under the hand there (an additional attribute
> might have pointed the precise frame in which the exception was
> caught).
> 
> Tanks for the attention,
> Regards,
> Pascal


From alfps at start.no  Wed Mar 17 08:03:06 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 17 Mar 2010 13:03:06 +0100
Subject: Python bindings tutorial
In-Reply-To: <mailman.898.1268824466.23598.python-list@python.org>
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>	<mailman.863.1268766752.23598.python-list@python.org>	<98447f7e-64db-4a10-b19e-685f5b079cf6@l25g2000yqd.googlegroups.com>	<hnq7qt$kl0$1@dough.gmane.org>
	<mailman.898.1268824466.23598.python-list@python.org>
Message-ID: <hnqgdr$prr$1@news.eternal-september.org>

* Dave Angel:
> Stefan Behnel wrote:
>> <div class="moz-text-flowed" style="font-family: 
>> -moz-fixed">MikeLisanke at gmail.com, 17.03.2010 10:08:
>>> Its interesting you've mentioned the hard work involved in this
>>> interface (binding to an EXE instead of a DLL). A year or more ago I
>>> was looking at interfacing IPMITOOL to python. Do to the problems
>>> incurred with swig/python I switched to a running the process through
>>> its command-line interface. I always felt the problems in interfacing
>>> python to an EXE should be worked on (to minimize them), making the
>>> direct use of an EXE API's a routine task. I understand some of the
>>> problems using an EXE (not running all of its startup code   but
>>> enough for its proper operation). Have you found this a recurring
>>> question? Thanks.
>>
>> I think the point here is that executable binaries are not supposed to 
>> be used as libraries. Libraries are. That's the difference between a 
>> DLL and an executable in the first place. To run an executable, 
>> execute it. The subprocess module is the tool of choice here. To use a 
>> DLL, link against it.
>>
>> Stefan
>>
> There's no real reason parts of an exe cannot be exported, same as a 
> dll.  They are in fact the same structure.  And in fact many other files 
> in the Windows environment are also the same structure, from fonts to ocx's
> 
> Saying they're "not supposed to be used" is like saying that a python 
> module should not have an
> 
> if __name__ == "__main__":
> 
> section.  After all, who could want to both run a file, and import the 
> same file??

A Windows DLL has defined initialization and cleanup per process and per thread.

This means that e.g. static variables can be properly initialized when you load 
the DLL in order to use its functions (I'm skipping discussion of subtle 
problems, but that's the essence).

A Windows EXE has (only) a single entry point which is for process startup. It 
invokes the EXE's behavior-as-a-program. There is no way to use it to e.g. 
initialize static variables in order to use exported functions.

Hence Mike Lisanke's idea of "not running all of its startup code but enough for 
its proper operation" is generally not possible.

An EXE can be used as a kind of server, /if/ it is designed for that. In 
particular it can be a COM server, allowing access of its functionality from any 
COM-enabled binding, which for Python would mean OLE Automation (COM, OLE, 
Automation: this is Microsoft technology, we're talking Windows EXEs here). But 
a Python binding to EXEs in general can't, as far as I can see, make assumptions 
about any particular kind of server being implemented by the EXE.


Cheers & hth.,

- Alf


From stefan_ml at behnel.de  Wed Mar 17 08:18:33 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 17 Mar 2010 13:18:33 +0100
Subject: Python bindings tutorial
In-Reply-To: <4BA0B985.3060501@ieee.org>
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>	<mailman.863.1268766752.23598.python-list@python.org>	<98447f7e-64db-4a10-b19e-685f5b079cf6@l25g2000yqd.googlegroups.com>	<hnq7qt$kl0$1@dough.gmane.org>
	<4BA0B985.3060501@ieee.org>
Message-ID: <hnqhao$o9m$1@dough.gmane.org>

Dave Angel, 17.03.2010 12:14:
> Stefan Behnel wrote:
>> I think the point here is that executable binaries are not supposed to
>> be used as libraries. Libraries are. That's the difference between a
>> DLL and an executable in the first place. To run an executable,
>> execute it. The subprocess module is the tool of choice here. To use a
>> DLL, link against it.
>>
> There's no real reason parts of an exe cannot be exported, same as a
> dll. They are in fact the same structure. And in fact many other files
> in the Windows environment are also the same structure, from fonts to ocx's

So, because you can, you'd also try to link against fonts then, I guess?

I hope you notice that what you and me said isn't contradictory. But 
there's a reason why there are libraries and executables, and there's no 
reason you *should* export anything from an executable - that's what 
libraries are there for. That's my point.

Besides, nothing guarantees that it's safe to call stuff that an executable 
exports. The executable may well require some setup code that it only 
executes when it is properly started.

Stefan



From rps at haystack.mit.edu  Wed Mar 17 08:24:03 2010
From: rps at haystack.mit.edu (robert schaefer)
Date: Wed, 17 Mar 2010 08:24:03 -0400
Subject: question about tkinter
Message-ID: <54C3DEE7-50FE-46D8-B1EA-E2C54E11817F@haystack.mit.edu>

Hello,

 This is my first posting to this list so please be gentle - 

 I am new to python and am using it on red-hat linux (I am new to that too).
 I am responsible for installing open source packages (including python) onto a distributed system of linux boxes.

 My question is, on python version 2.6.2 tkinter refuses to install.
 Without tkinter, I cannot use Idle.

 I looked at the install/configure script and hacked it a bit, but every fix only caused new problems.
 There are serious issues with that script for  finding necessary libraries.

We have a Sun-OS box with python version 2.5.x (I don't know the means of installation) that
tkinter installed correctly, and Idle works fine.

 My question is - has anyone else noticed the problem of tkinter and red-hat linux?  
Has this been corrected in python 2.6.4 (or 2.6.5)?

thanks,
  bob s.


-----------------------------------
robert schaefer
Atmospheric Sciences Group
MIT Haystack Observatory
Westford, MA 01886

email:  rps at haystack.mit.edu
voice:  781-981-5767
www:  http://www.haystack.mit.edu



From __peter__ at web.de  Wed Mar 17 08:34:51 2010
From: __peter__ at web.de (Peter Otten)
Date: Wed, 17 Mar 2010 13:34:51 +0100
Subject: Swapping Content of Two Dictionaries.
References: <779ea7fb1003160146t6fe79d6erc6dc12ea7452f6b3@mail.gmail.com>
	<779ea7fb1003170426o3dff6f06lade4b90c6a81f265@mail.gmail.com>
Message-ID: <hnqi8k$s8t$1@dough.gmane.org>

Hatem Oraby wrote:

> Hello, I want to swap the content of two dictionaries, the obvious way to
> do it is:
> a = {1:"I'am A"}
> b = {2:"I'm B"}
> temp = a
> a = b
> b = temp

That can be simplified to

a, b = b, a

and is almost certainly the right approach.

> tempKeys = a.keys()
> diffKeys = a.keys()  - b.keys()   #I do it using set()s
> 
> #item = a
> temp = {}
> for key in a.keys():
>    item[key] = a[key]
> 
> for key in diffKeys:
>     del a[key] #delete stuff that exist in a but not b.
> 
> for key in b.keys():
>     a[key] = b[key]
> 
> b = temp
> 
> This works great as the content referenced by the dictionary is changed
> rather than changing the reference of dictionary itself so it's reflected
> by any "scope" that references the dictionary.
> 
> My problem is that i need to do this operation a LOT, simply I got a
> problem that my program go through a very long loop and inside this loop
> this operation is needed to be done twice and the dictionary size ain't
> very small.

You could try

>>> a = {"a": 1, "b": 2}
>>> b = {"b": 3, "c": 4}
>>> t = a.copy()
>>> a.clear()
>>> a.update(b)
>>> b.clear()
>>> b.update(t)
>>> a
{'c': 4, 'b': 3}
>>> b
{'a': 1, 'b': 2}

> If anyone has a suggestion one how to do it faster then please feel free
> and welcome to contribute.

> Anyway, I decided to go and implement it in C to gain performance, And

Premature optimization? If you explain what you are trying to achieve 
someone might come up with a way to do it without swapping dict contents.

Peter




From chambon.pascal at gmail.com  Wed Mar 17 08:42:06 2010
From: chambon.pascal at gmail.com (Pascal Chambon)
Date: Wed, 17 Mar 2010 13:42:06 +0100
Subject: Castrated traceback in sys.exc_info()
In-Reply-To: <20100317124019.7013dfa3@moriz.interne>
References: <7866674b-46ba-49e2-9d76-e8259ba22df0@z3g2000yqz.googlegroups.com>
	<20100317124019.7013dfa3@moriz.interne>
Message-ID: <9fd96c3b1003170542t4ea864c6y359107cb747536da@mail.gmail.com>

Hello,

traceback functions indeed allow the manipulation of exception tracebacks,
but the root problem is that anyway, since that traceback is incomplete,
your "traceback.format_exc().splitlines()" will only provide frames for
callee (downward) functions, not caller (upward) ones, starting from the
exception catching frame.

Regards,
Pascal



2010/3/17 Michael Ricordeau <michael.ricordeau at gmail.com>

> Hi,
>
> to log tracebacks, you can probably try traceback module.
>
> I use it like this :
>
> import traceback
> .... # your code
>
> for line in traceback.format_exc().splitlines():
>  log.trace(line)
>
>
>
> Le Wed, 17 Mar 2010 03:42:44 -0700 (PDT),
> Pakal <chambon.pascal at gmail.com> a ?crit :
>
> > Hello
> >
> > I've just realized recently that sys.exc_info() didn't return a full
> > traceback for exception concerned : it actually only contains the
> > frame below the point of exception catching.
> >
> > That's very annoying to me, because I planned to log such tracebacks
> > with logging.critical(*****, exc_info=True), and these partial
> > tracebacks, like the one below, are clearly unsufficient to determine
> > where the problem comes from. A whole traceback, from program entry
> > point to exception raising point, would be much better.
> >
> > 2010-03-17 09:28:59,184 - pims - CRITICAL - This is just a test to
> > ensure critical emails are properly sent
> > Traceback (most recent call last):
> > << HERE, lots of frames missing >>
> >   File "test_common.py", line 34, in test_email_sending
> >     os.open("qsdsdqsdsdqsd", "r")
> > TypeError: an integer is required
> >
> > Is there any workaround for this ? I've thought about a custom logging
> > formatter, which would take both the exc_info traceback AND its own
> > full backtrace, and to connect them together on their relevant part,
> > but it's awkward and error prone... why can't we just have all the
> > precious traceback info under the hand there (an additional attribute
> > might have pointed the precise frame in which the exception was
> > caught).
> >
> > Tanks for the attention,
> > Regards,
> > Pascal
>
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From __peter__ at web.de  Wed Mar 17 09:00:32 2010
From: __peter__ at web.de (Peter Otten)
Date: Wed, 17 Mar 2010 14:00:32 +0100
Subject: question about tkinter
References: <mailman.903.1268829586.23598.python-list@python.org>
Message-ID: <hnqjoo$g4o$02$1@news.t-online.com>

robert schaefer wrote:

>  This is my first posting to this list so please be gentle -
> 
>  I am new to python and am using it on red-hat linux (I am new to that
>  too). I am responsible for installing open source packages (including
>  python) onto a distributed system of linux boxes.
> 
>  My question is, on python version 2.6.2 tkinter refuses to install.

Does it say "I'm sorry Bob, I'm afraid I can't do this"?

>  Without tkinter, I cannot use Idle.
> 
>  I looked at the install/configure script and hacked it a bit, but every
>  fix only caused new problems.
>  There are serious issues with that script for  finding necessary
>  libraries.

If there are serious problems you have to give some details.

However, if in the past a newbie had problems with Tkinter support on linux 
the most frequent problem was that the Tcl/Tk development libraries weren't 
installed. I don't know how those are called on Red Hat, maybe something 
like

tcl*-dev.rpm

Did you install these before running the configure script?

Peter


From lie.1296 at gmail.com  Wed Mar 17 09:16:53 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Thu, 18 Mar 2010 00:16:53 +1100
Subject: to pass self or not to pass self
In-Reply-To: <4ba09d09$0$21466$426a74cc@news.free.fr>
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org>
	<4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com>
	<4ba09d09$0$21466$426a74cc@news.free.fr>
Message-ID: <4ba0d65f$1@dnews.tpgi.com.au>

On 03/17/2010 08:12 PM, Bruno Desthuilliers wrote:
> Patrick Maupin a ?crit :
>> On Mar 16, 1:59 pm, Jason Tackaberry <t... at urandom.ca> wrote:
>>> Why not create the bound methods at instantiation time, rather than
>>> using the descriptor protocol which has the overhead of creating a new
>>> bound method each time the method attribute is accessed?
>>
>> Well, for one thing, Python classes are open.  They can be added to at
>> any time.  For another thing, you might not ever use most of the
>> methods of an instance, so it would be a huge waste to create those.
> 
> A possible optimization would be a simple memoization on first access.

But what if, for example, one uses some descriptor/metaclass magic to
make it so that each subsequent access to the attribute returns a method
bound to different objects?


From h.stenstrom at gmail.com  Wed Mar 17 09:20:42 2010
From: h.stenstrom at gmail.com (=?ISO-8859-1?Q?Helge_Stenstr=F6m?=)
Date: Wed, 17 Mar 2010 06:20:42 -0700 (PDT)
Subject: Function that knows its argument's variable name
References: <47e725b6-1470-4563-a64b-02630032ef36@g26g2000yqn.googlegroups.com>
	<80ai5hFh3uU1@mid.individual.net>
Message-ID: <02eb7ec7-1e22-43a4-8019-9a154c734669@y17g2000yqd.googlegroups.com>

Thank you to all who answered. Inspection is apparently possible, but
too complex for me.
Greg's solution does what I want, inserting "" is no problem.

/Helge


> Not exactly, but you can come close with a little hackery.
>
> import sys
>
> def print_var(name):
> ? ?print name, "=", sys._getframe(1).f_locals[name]
>
> def f():
> ? ?fred = 42
> ? ?mary = "christmas"
> ? ?print_var("fred")
> ? ?print_var("mary")
>
> f()
>
> --
> Greg



From python at bdurham.com  Wed Mar 17 09:22:37 2010
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 17 Mar 2010 09:22:37 -0400
Subject: Web Hosting Python 3
In-Reply-To: <0016e64642280288940481f66d5e@google.com>
References: <0016e64642280288940481f66d5e@google.com>
Message-ID: <1268832157.6206.1365286517@webmail.messagingengine.com>

Hidura,

> Hello list, i am in a project what need hosting, who give
hosting to python3?

Check out www.webfaction.com. I'm extremely pleased with this
vendor.

Highly recommended!

Malcolm
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From vinay_sajip at yahoo.co.uk  Wed Mar 17 09:24:43 2010
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Wed, 17 Mar 2010 06:24:43 -0700 (PDT)
Subject: Castrated traceback in sys.exc_info()
References: <7866674b-46ba-49e2-9d76-e8259ba22df0@z3g2000yqz.googlegroups.com>
Message-ID: <95063943-4a45-42f5-81a2-761cf48daaa8@d27g2000yqf.googlegroups.com>

On Mar 17, 10:42?am, Pakal <chambon.pas... at gmail.com> wrote:
> Hello
>
> I've just realized recently that sys.exc_info() didn't return a full
> traceback for exception concerned : it actually only contains the
> frame below the point of exception catching.
>
> That's very annoying to me, because I planned to log such tracebacks
> withlogging.critical(*****, exc_info=True), and these partial
> tracebacks, like the one below, are clearly unsufficient to determine
> where the problem comes from. A whole traceback, from program entry
> point to exception raising point, would be much better.
>
> 2010-03-17 09:28:59,184 - pims - CRITICAL - This is just a test to
> ensure critical emails are properly sent
> Traceback (most recent call last):
> << HERE, lots of frames missing >>
> ? File "test_common.py", line 34, in test_email_sending
> ? ? os.open("qsdsdqsdsdqsd", "r")
> TypeError: an integer is required
>
> Is there any workaround for this ? I've thought about a customlogging
> formatter, which would take both the exc_info traceback AND its own
> full backtrace, and to connect them together on their relevant part,
> but it's awkward and error prone... why can't we just have all the
> precious traceback info under the hand there (an additional attribute
> might have pointed the precise frame in which the exception was
> caught).
>
> Tanks for the attention,
> Regards,
> Pascal

Do you have a short script which demonstrates the problem? Some more
context is needed. For example, if you have multiple threads of
execution, the traceback will only go up to the top-level function in
the thread.

Regards,

Vinay Sajip


From a_jtim at bellsouth.net  Wed Mar 17 09:30:24 2010
From: a_jtim at bellsouth.net (Tim Arnold)
Date: Wed, 17 Mar 2010 06:30:24 -0700 (PDT)
Subject: multiprocessing on freebsd
Message-ID: <f1121800-f416-4455-b223-dfa562edb853@t23g2000yqt.googlegroups.com>

Hi,
I'm checking to see if multiprocessing works on freebsd for any
version of python. My server is about to get upgraded from 6.3 to 8.0
and I'd sure like to be able to use multiprocessing.

I think the minimal test would be:
---------------------
import multiprocessing
q = multiprocessing.Queue()
---------------------

with 6.3, I get

 File "/usr/local/lib/python2.6/multiprocessing/__init__.py", line
212, in Queue
    from multiprocessing.queues import Queue
  File "/usr/local/lib/python2.6/multiprocessing/queues.py", line 22,
in <module>
    from multiprocessing.synchronize import Lock, BoundedSemaphore,
Semaphore, Condition
  File "/usr/local/lib/python2.6/multiprocessing/synchronize.py", line
33, in <module>
    " function, see issue 3770.")
ImportError: This platform lacks a functioning sem_open
implementation, therefore, the required synchronization primitives
needed will not function, see issue 3770.


thanks for any info,
--Tim Arnold


From rps at haystack.mit.edu  Wed Mar 17 09:32:46 2010
From: rps at haystack.mit.edu (robert schaefer)
Date: Wed, 17 Mar 2010 09:32:46 -0400
Subject: question about tkinter
In-Reply-To: <hnqjoo$g4o$02$1@news.t-online.com>
References: <mailman.903.1268829586.23598.python-list@python.org>
	<hnqjoo$g4o$02$1@news.t-online.com>
Message-ID: <8C160E0A-D35A-4EA8-822B-8CB5BCD9C529@haystack.mit.edu>


Peter,

Most of my life has been dealing with recalcitrant HAL's in one guise or another.  
These days, I think HAL has permanently taken up residence in Toyota's engine and brakes.
"Stop the car Dave? Have you changed my oil or even washed me lately?"
Some serious "sneak paths" are going on.

Anyway -

tkinter is in two parts:
  1. a python wrapper 
  2. c code

Both are present in the 2.6.2 python download.
It appears to be a "I can't find the library" path problem not a file existence problem.

1. gcc can't find the libraries that tkinter c code links to ( I could fix that)
2. the python installer can't find all the library paths to all the pieces
    - I started fixing this, then determined it would be easier to rewrite from scratch than patch.
      That is, the given method of building paths in the script are way off from reality, not just an
      add this one path and everything will now work kind of magic.
      I felt that the "official" python people would have an easier time of this - so gave up.

bob

On Mar 17, 2010, at 9:00 AM, Peter Otten wrote:

> robert schaefer wrote:
> 
>> This is my first posting to this list so please be gentle -
>> 
>> I am new to python and am using it on red-hat linux (I am new to that
>> too). I am responsible for installing open source packages (including
>> python) onto a distributed system of linux boxes.
>> 
>> My question is, on python version 2.6.2 tkinter refuses to install.
> 
> Does it say "I'm sorry Bob, I'm afraid I can't do this"?
> 
>> Without tkinter, I cannot use Idle.
>> 
>> I looked at the install/configure script and hacked it a bit, but every
>> fix only caused new problems.
>> There are serious issues with that script for  finding necessary
>> libraries.
> 
> If there are serious problems you have to give some details.
> 
> However, if in the past a newbie had problems with Tkinter support on linux 
> the most frequent problem was that the Tcl/Tk development libraries weren't 
> installed. I don't know how those are called on Red Hat, maybe something 
> like
> 
> tcl*-dev.rpm
> 
> Did you install these before running the configure script?
> 
> Peter
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 
> !DSPAM:4ba0d3cd3229021468!
> 

-----------------------------------
robert schaefer
Atmospheric Sciences Group
MIT Haystack Observatory
Westford, MA 01886

email:  rps at haystack.mit.edu
voice:  781-981-5767
www:  http://www.haystack.mit.edu



From hidura at gmail.com  Wed Mar 17 09:39:21 2010
From: hidura at gmail.com (Hidura)
Date: Wed, 17 Mar 2010 09:39:21 -0400
Subject: Web Hosting Python 3
In-Reply-To: <1268832157.6206.1365286517@webmail.messagingengine.com>
References: <0016e64642280288940481f66d5e@google.com>
	<1268832157.6206.1365286517@webmail.messagingengine.com>
Message-ID: <4bbf7fb21003170639j1fe53d3fr17524681085b36a0@mail.gmail.com>

I've saw last night in the help area they support Python3.1, thanks anyway

On Wed, Mar 17, 2010 at 9:22 AM, <python at bdurham.com> wrote:

>  Hidura,
>
> > Hello list, i am in a project what need hosting, who give hosting to
> python3?
>
> Check out www.webfaction.com. I'm extremely pleased with this vendor.
>
> Highly recommended!
>
> Malcolm
>



-- 
Hidura
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From ashwiniyal at gmail.com  Wed Mar 17 09:54:18 2010
From: ashwiniyal at gmail.com (ashwini yal)
Date: Wed, 17 Mar 2010 19:24:18 +0530
Subject: Special characters (^M & ^[[D) when I read pxssh::before and write it
	to a file
Message-ID: <771960b21003170654u1f6bac7bm1c0d7b30e2187f1f@mail.gmail.com>

Hi,

I am writing a python script which logs into the machine using pxssh, sends
a command, reads the response and writes the response to the file.

But, when I open the file in the editor like vi, its showing special
characters like ^M and ^[[D instead of spaces or newlines.

This is how my code looks like ...

s = pxssh.pxssh()
s.login(ip, username, password)

cmd = 'xyz'
s.sendline (cmd)
s.prompt()
output = s.before
fileWrite = open(filePath , 'wb')
fileWrite.write(output)
s.prompt()


This is how my filePath looks like when I open it using vi editor.

Starting command execution on host xxx.xxx.xxx.xxx

D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^M

Command executed successfully ^M

Executing next command ...^M

-- 
Regards ,
Ashwini . K
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From __peter__ at web.de  Wed Mar 17 09:59:40 2010
From: __peter__ at web.de (Peter Otten)
Date: Wed, 17 Mar 2010 14:59:40 +0100
Subject: question about tkinter
References: <mailman.903.1268829586.23598.python-list@python.org>
	<hnqjoo$g4o$02$1@news.t-online.com>
	<mailman.906.1268832771.23598.python-list@python.org>
Message-ID: <hnqn7l$645$03$1@news.t-online.com>

robert schaefer wrote:

> tkinter is in two parts:
> 1. a python wrapper
> 2. c code
> 
> Both are present in the 2.6.2 python download.
> It appears to be a "I can't find the library" path problem not a file
> existence problem.
> 
> 1. gcc can't find the libraries that tkinter c code links to ( I could fix
> that) 2. the python installer can't find all the library paths to all the
> pieces - I started fixing this, then determined it would be easier to
> rewrite from scratch than patch. That is, the given method of building
> paths in the script are way off from reality, not just an add this one
> path and everything will now work kind of magic. I felt that the
> "official" python people would have an easier time of this - so gave up.

Just to exclude the simple problems (unfortunately I can't help you with the 
hard ones): Are the tcl development packages installed on your system?

Peter 



From stefan_ml at behnel.de  Wed Mar 17 10:10:27 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 17 Mar 2010 15:10:27 +0100
Subject: Swapping Content of Two Dictionaries.
In-Reply-To: <779ea7fb1003170426o3dff6f06lade4b90c6a81f265@mail.gmail.com>
References: <779ea7fb1003160146t6fe79d6erc6dc12ea7452f6b3@mail.gmail.com>
	<779ea7fb1003170426o3dff6f06lade4b90c6a81f265@mail.gmail.com>
Message-ID: <hnqnsj$jdi$1@dough.gmane.org>

Hatem Oraby, 17.03.2010 12:26:
> However, consider the case in which the dictionary we are referencing lives
> in another module:
> #external.py
> #
> #a = {1:"I'am A}
> import external
>
> temp = external.a
> external.a = b
> b = temp

Looks like the interface of your module is broken. It shouldn't export the 
two dicts.


> My problem is that i need to do this operation a LOT, simply I got a problem
> that my program go through a very long loop and inside this loop this
> operation is needed to be done twice and the dictionary size ain't very
> small.

Please explain what you use the dicts for and how they are supposed to be 
used by your own code and by external code. That will allow us to give an 
advice on how to design your module better.

Stefan



From pruebauno at latinmail.com  Wed Mar 17 10:29:31 2010
From: pruebauno at latinmail.com (nn)
Date: Wed, 17 Mar 2010 07:29:31 -0700 (PDT)
Subject: Searching for most pythonic/least stupid way to do something 
	simple
References: <d62c4091-e0f0-4195-9b0e-dd597f9d0131@u9g2000yqb.googlegroups.com>
	<7xmxy87172.fsf@ruckus.brouhaha.com>
	<2c39f6d4-3118-43f3-907d-57f733dc7ed8@d27g2000yqf.googlegroups.com>
	<288bfc27-0c5b-4601-9ceb-dd2614593fb9@m37g2000yqf.googlegroups.com> 
	<mailman.862.1268766468.23598.python-list@python.org>
Message-ID: <40341e67-0609-4da7-b32e-afdf3ea5b6cc@d27g2000yqf.googlegroups.com>



Michael Torrie wrote:
> david jensen wrote:
> > of course, changing nn's to:
> > def getOutcomes(myList=[2,5,8,3,5]):
> >    low_id = int(myList[0]>myList[1])
> >    amountToShare = 2*myList[low_id]
> >    remainder = myList[not low_id]-myList[low_id]
> >    tail=list(myList[2:])
> >    outcomes = [[amountToShare*perc, remainder+amountToShare*(1-perc)]+
> > tail for perc in (1.0, 0.75, 0.5, 0.25, 0.0)] if not low_id else
> > [[remainder+amountToShare*perc, amountToShare*(1-perc)]+ tail for perc
> > in (1.0, 0.75, 0.5, 0.25, 0.0)]
> >    return outcomes
> >
> >
> > works, just hides the ugliness in a more compact form
>
> If Gerard's code works, I would consider it far superior to your code
> here.  Pythonic does not necessarily mean short and ugly, nor does it
> mean that you have to always use list comprehensions.   Having a
> readable algorithm that's easy to follow in the future is a far better
> way than trying to use python's cool features to compact the code to as
> small and unreadable section as possible.
>
> I used to use list comprehension all the time, but I've found that often
> an explicit for loop is a much better solution in terms of
> maintainability.  Especially when you start seeing nested comprehensions
> such as you have here.

To be fair, that list comprehension was unnecessary complicated. The
following version does the same thing and still looks pretty
reasonable IMHO:

def getOutcomes(myList=[2,5,8,3,5]):
   low_id = int(myList[0]>myList[1])
   high_id = not low_id
   smaller = myList[low_id]
   bigger = myList[high_id]
   amountToShare = 2*smaller
   remainder = bigger-smaller
   remain0 = low_id*remainder
   remain1 = high_id*remainder
   tail = list(myList[2:])
   percents = (1.0, 0.75, 0.5, 0.25, 0.0)
   outcomes = [[remain0+amountToShare*perc, remain1+amountToShare*(1-
perc)]
               +tail for perc in percents]
   return outcomes


From rps at haystack.mit.edu  Wed Mar 17 10:33:41 2010
From: rps at haystack.mit.edu (robert schaefer)
Date: Wed, 17 Mar 2010 10:33:41 -0400
Subject: question about tkinter
In-Reply-To: <hnqn7l$645$03$1@news.t-online.com>
References: <mailman.903.1268829586.23598.python-list@python.org>
	<hnqjoo$g4o$02$1@news.t-online.com>
	<mailman.906.1268832771.23598.python-list@python.org>
	<hnqn7l$645$03$1@news.t-online.com>
Message-ID: <CD942CDF-0D69-421E-8047-6EDFC7274873@haystack.mit.edu>

No, And there's a reason (perhaps not a great one - but I'm got some constraints).

I am not the system administrator and the tcl installer wants to be 
installed as root. I tried it. 

The rationale for not doing this is that the installation packages that I am administrator for,
 are all installed in non-root directories. by non-root people. 
 If I have to install any package as root, then that becomes
 "different". The machines are all linux and intended to be swappable/exchangeable and installed by
 anyone without root access. This simplifies maintenance when a large number of boxes are involved.

Are there any tcl/tk packages that permit re-direction of installation to non-root directories?

This problem is just an ongoing irritation, python works fine without tkinter, I just can't get idle
 to work without it.  

 Related to that I tailored Ipython to work with gtk (ipython's default was tkinter) - tailoring was by a command
- is there any way to command idle to use gtk?


On Mar 17, 2010, at 9:59 AM, Peter Otten wrote:

> robert schaefer wrote:
> 
>> tkinter is in two parts:
>> 1. a python wrapper
>> 2. c code
>> 
>> Both are present in the 2.6.2 python download.
>> It appears to be a "I can't find the library" path problem not a file
>> existence problem.
>> 
>> 1. gcc can't find the libraries that tkinter c code links to ( I could fix
>> that) 2. the python installer can't find all the library paths to all the
>> pieces - I started fixing this, then determined it would be easier to
>> rewrite from scratch than patch. That is, the given method of building
>> paths in the script are way off from reality, not just an add this one
>> path and everything will now work kind of magic. I felt that the
>> "official" python people would have an easier time of this - so gave up.
> 
> Just to exclude the simple problems (unfortunately I can't help you with the 
> hard ones): Are the tcl development packages installed on your system?
> 
> Peter 
> 
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 
> !DSPAM:4ba0e1dc51621869525538!
> 

-----------------------------------
robert schaefer
Atmospheric Sciences Group
MIT Haystack Observatory
Westford, MA 01886

email:  rps at haystack.mit.edu
voice:  781-981-5767
www:  http://www.haystack.mit.edu



From robin at reportlab.com  Wed Mar 17 10:38:16 2010
From: robin at reportlab.com (Robin Becker)
Date: Wed, 17 Mar 2010 14:38:16 +0000
Subject: bug in bdist_wininst cross compile?
Message-ID: <4BA0E958.8050205@chamonix.reportlab.co.uk>

has anyone had any success with cross compilation and bdist_wininst; I have 
modified build_ext very slightly to fix a small bug in cross compilation related 
to library order. That seems to fix

setup.py build --plat-name=win-amd64


however, when I try to do a clean build of an exe ie

rm -rf build

setup.py bdist_wininst --plat-name=win-amd64

it appears as though build is invoked with the wrong plat-name ie I see this in 
the output

> running bdist_wininst
> running build
> running build_py
> creating build
> creating build\lib.win32-2.6
> creating build\lib.win32-2.6\reportlab
> copying src\reportlab\rl_config.py -> build\lib.win32-2.6\reportlab
......
> C:\Program Files\Microsoft Visual Studio 9.0\VC\BIN\cl.exe /c /nolog

followed by errors related to a missing library (the amd64 version won't work 
with a win32 build).

If I build first with

setup.py build --plat-name=win-amd64

and then use

setup.py bdist_wininst --plat-name=win-amd64 --skip-build

then I seem to get a proper amd64 exe.

I think the problem can be fixed by modifying distutils/command/bdist_wininst.py 
using this patch

> *** bdist_wininst.py.orig       Wed Mar 17 14:00:15 2010
> --- bdist_wininst.py    Wed Mar 17 14:29:55 2010
> ***************
> *** 79,90 ****
>
>       def finalize_options (self):
>           if self.bdist_dir is None:
> !             if self.skip_build and self.plat_name:
> !                 # If build is skipped and plat_name is overridden, bdist will
> !                 # not see the correct 'plat_name' - so set that up manually.
>                   bdist = self.distribution.get_command_obj('bdist')
>                   bdist.plat_name = self.plat_name
> !                 # next the command will be initialized using that name
>               bdist_base = self.get_finalized_command('bdist').bdist_base
>               self.bdist_dir = os.path.join(bdist_base, 'wininst')
>           if not self.target_version:
> --- 79,91 ----
>
>       def finalize_options (self):
>           if self.bdist_dir is None:
> !             if self.plat_name:
> !                 #bdist doesn't propagate plat_name so we do it here
> !                 build = self.distribution.get_command_obj('build')
> !                 build.plat_name = self.plat_name
>                   bdist = self.distribution.get_command_obj('bdist')
>                   bdist.plat_name = self.plat_name
> !                 # next the command(s) will be initialized using that name
>               bdist_base = self.get_finalized_command('bdist').bdist_base
>               self.bdist_dir = os.path.join(bdist_base, 'wininst')
>           if not self.target_version:

which forces bdist_wininst's version of the plat_name forward onto both build 
and bdist.
-- 
Robin Becker



From pmaupin at gmail.com  Wed Mar 17 10:43:50 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Wed, 17 Mar 2010 07:43:50 -0700 (PDT)
Subject: to pass self or not to pass self
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org> 
	<4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com> 
	<4ba09d09$0$21466$426a74cc@news.free.fr>
Message-ID: <503dc9c5-e1ce-4b33-aff4-ee9677839fe0@33g2000yqj.googlegroups.com>

On Mar 17, 4:12?am, Bruno Desthuilliers <bruno.
42.desthuilli... at websiteburo.invalid> wrote:
> Patrick Maupin a ?crit :
>
> > On Mar 16, 1:59 pm, Jason Tackaberry <t... at urandom.ca> wrote:
> >> Why not create the bound methods at instantiation time, rather than
> >> using the descriptor protocol which has the overhead of creating a new
> >> bound method each time the method attribute is accessed?
>
> > Well, for one thing, Python classes are open. ?They can be added to at
> > any time. ?For another thing, you might not ever use most of the
> > methods of an instance, so it would be a huge waste to create those.
>
> A possible optimization would be a simple memoization on first access.

I do agree that memoization on access is a good pattern, and I use it
frequently.  I don't know if I would want the interpreter
automagically doing that for everything, though -- it would require
some thought to figure out what the overhead cost is for the things
that are only used once.

Usually, I will have a slight naming difference for the things I want
memoized, to get the memoization code to run.  For example, if you add
an underbar in front of everything you want memoized:

class foo(object):

    def _bar(self):
        pass

    def __getattr__(self, aname):
        if aname.startswith('_'):
            raise AttributeError
        value = getattr(self, '_' + aname)
        self.aname = value
        return value

obj = foo()

So then the first time you look up obj.bar, it builds the bound
method, and on subsequent accesses it just returns the previously
bound method.

Regards,
Pat


From benjamin.kaplan at case.edu  Wed Mar 17 10:51:50 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 17 Mar 2010 10:51:50 -0400
Subject: Special characters (^M & ^[[D) when I read pxssh::before and 
	write it to a file
In-Reply-To: <771960b21003170654u1f6bac7bm1c0d7b30e2187f1f@mail.gmail.com>
References: <771960b21003170654u1f6bac7bm1c0d7b30e2187f1f@mail.gmail.com>
Message-ID: <ec96e1391003170751q355f54b7l843aacbf0a04a3de@mail.gmail.com>

On Wed, Mar 17, 2010 at 9:54 AM, ashwini yal <ashwiniyal at gmail.com> wrote:

> Hi,
>
> I am writing a python script which logs into the machine using pxssh, sends
> a command, reads the response and writes the response to the file.
>
> But, when I open the file in the editor like vi, its showing special
> characters like ^M and ^[[D instead of spaces or newlines.
>
> This is how my code looks like ...
>
> s = pxssh.pxssh()
> s.login(ip, username, password)
>
> cmd = 'xyz'
> s.sendline (cmd)
> s.prompt()
> output = s.before
> fileWrite = open(filePath , 'wb')
> fileWrite.write(output)
> s.prompt()
>
>
> This is how my filePath looks like when I open it using vi editor.
>
> Starting command execution on host xxx.xxx.xxx.xxx
>
>
> D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^M
>
> Command executed successfully ^M
>
> Executing next command ...^M
>
>
I don't know what's going with the ^[[D, but ^M is a carriage return. Your
connection is returning CRLF ("\r\n") for the line endings (which is what
Windows uses for line endings) instead of the Unix line ending, which is
just a line feed "\n".
-------------- next part --------------
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From bruno.42.desthuilliers at websiteburo.invalid  Wed Mar 17 10:51:53 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 17 Mar 2010 15:51:53 +0100
Subject: to pass self or not to pass self
In-Reply-To: <4ba0d65f$1@dnews.tpgi.com.au>
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org>
	<4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com>
	<4ba09d09$0$21466$426a74cc@news.free.fr>
	<4ba0d65f$1@dnews.tpgi.com.au>
Message-ID: <4ba0ec7a$0$14371$426a74cc@news.free.fr>

Lie Ryan a ?crit :
> On 03/17/2010 08:12 PM, Bruno Desthuilliers wrote:
>> Patrick Maupin a ?crit :
>>> On Mar 16, 1:59 pm, Jason Tackaberry <t... at urandom.ca> wrote:
>>>> Why not create the bound methods at instantiation time, rather than
>>>> using the descriptor protocol which has the overhead of creating a new
>>>> bound method each time the method attribute is accessed?
>>> Well, for one thing, Python classes are open.  They can be added to at
>>> any time.  For another thing, you might not ever use most of the
>>> methods of an instance, so it would be a huge waste to create those.
>> A possible optimization would be a simple memoization on first access.
> 
> But what if, for example, one uses some descriptor/metaclass magic to
> make it so that each subsequent access to the attribute returns a method
> bound to different objects?

Well, that's the whole problem with dynamism vs optimization...


From pengyu.ut at gmail.com  Wed Mar 17 10:53:42 2010
From: pengyu.ut at gmail.com (Peng Yu)
Date: Wed, 17 Mar 2010 09:53:42 -0500
Subject: highlight words by regex in pdf files using python
In-Reply-To: <1fc72785-e527-4809-b5a1-43d78fe86f87@r27g2000yqn.googlegroups.com>
References: <af0830ae-1d24-4db9-b721-d6602fedd540@15g2000yqi.googlegroups.com>
	<1fc72785-e527-4809-b5a1-43d78fe86f87@r27g2000yqn.googlegroups.com>
Message-ID: <366c6f341003170753o36316de3ie13f11fad0b29900@mail.gmail.com>

On Tue, Mar 16, 2010 at 11:12 PM, Patrick Maupin <pmaupin at gmail.com> wrote:
> On Mar 4, 6:57?pm, Peng Yu <pengyu... at gmail.com> wrote:
>> I don't find a general pdf library in python that can do any
>> operations on pdfs.
>>
>> I want to automatically highlight certain words (using regex) in a
>> pdf. Could somebody let me know if there is a tool to do so in python?
>
> The problem with PDFs is that they can be quite complicated. ?There is
> the outer container structure, which isn't too bad (unless the
> document author applied encryption or fancy multi-object compression),
> but then inside the graphics elements, things could be stored as
> regular ASCII, or as fancy indexes into font-specific tables. ?Not
> rocket science, but the only industrial-strength solution for this is
> probably reportlab's pagecatcher.
>
> I have a library which works (primarily with the outer container) for
> reading and writing, called pdfrw. ?I also maintain a list of other
> PDF tools at http://code.google.com/p/pdfrw/wiki/OtherLibraries ?It
> may be that pdfminer (link on that page) will do what you want -- it
> is certainly trying to be complete as a PDF reader. ?But I've never
> personally used pdfminer.
>
> One of my pdfrw examples at http://code.google.com/p/pdfrw/wiki/ExampleTools
> will read in preexisting PDFs and write them out to a reportlab
> canvas. ?This works quite well on a few very simple ASCII PDFs, but
> the font handling needs a lot of work and probably won't work at all
> right now on unicode. ?(But if you wanted to improve it, I certainly
> would accept patches or give you commit rights!)
>
> That pdfrw example does graphics reasonably well. ?I was actually
> going down that path for getting better vector graphics into rst2pdf
> (both uniconvertor and svglib were broken for my purposes), but then I
> realized that the PDF spec allows you to include a page from another
> PDF quite easily (the spec calls it a form xObject), so you don't
> actually need to parse down into the graphics stream for that. ?So,
> right now, the best way to do vector graphics with rst2pdf is either
> to give it a preexisting PDF (which it passes off to pdfrw for
> conversion into a form xObject), or to give it a .svg file and invoke
> it with -e inkscape, and then it will use inkscape to convert the svg
> to a pdf and then go through the same path.

Thank you for your long reply! But I'm not sure if you get my question or not.

Acrobat can highlight certain words in pdfs. I could add notes to the
highlighted words as well. However, I find that I frequently end up
with highlighting some words that can be expressed by a regular
expression.

To improve my productivity, I don't want do this manually in Acrobat
but rather do it in an automatic way, if there is such a tool
available. People in reportlab mailing list said this is not possible
with reportlab. And I don't see PyPDF can do this. If you know there
is an API to for this purpose, please let me know. Thank you!

Regards,
Peng


From wsantee at gmail.com  Wed Mar 17 10:57:43 2010
From: wsantee at gmail.com (Wes Santee)
Date: Wed, 17 Mar 2010 07:57:43 -0700 (PDT)
Subject: Structure accessible by attribute name or index
Message-ID: <189ec016-9c2e-44ac-b01a-c264f165c30d@30g2000yqi.googlegroups.com>

I am very new to Python, and trying to figure out how to create an
object that has values that are accessible either by attribute name,
or by index.  For example, the way os.stat() returns a stat_result or
pwd.getpwnam() returns a struct_passwd.

In trying to figure it out, I've only come across C implementations of
the above types.  Nothing specifically in Python.  What is the Python
native way to create this kind of object?

I apologize if this has been widely covered already.  In searching for
an answer, I must be missing some fundamental concept that is
excluding me from finding an answer.

Cheers,
-Wes


From pmaupin at gmail.com  Wed Mar 17 11:11:40 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Wed, 17 Mar 2010 10:11:40 -0500
Subject: highlight words by regex in pdf files using python
In-Reply-To: <366c6f341003170753o36316de3ie13f11fad0b29900@mail.gmail.com>
References: <af0830ae-1d24-4db9-b721-d6602fedd540@15g2000yqi.googlegroups.com>
	<1fc72785-e527-4809-b5a1-43d78fe86f87@r27g2000yqn.googlegroups.com>
	<366c6f341003170753o36316de3ie13f11fad0b29900@mail.gmail.com>
Message-ID: <d09829f51003170811u56df00a4ga83f3afa0501545c@mail.gmail.com>

On Wed, Mar 17, 2010 at 9:53 AM, Peng Yu <pengyu.ut at gmail.com> wrote:
> Thank you for your long reply! But I'm not sure if you get my question or not.
>
> Acrobat can highlight certain words in pdfs. I could add notes to the
> highlighted words as well. However, I find that I frequently end up
> with highlighting some words that can be expressed by a regular
> expression.
>
> To improve my productivity, I don't want do this manually in Acrobat
> but rather do it in an automatic way, if there is such a tool
> available. People in reportlab mailing list said this is not possible
> with reportlab. And I don't see PyPDF can do this. If you know there
> is an API to for this purpose, please let me know. Thank you!

I do not know of any API specific to this purpose, no.  But I
mentioned three libraries (pagecatcher, pdfminer, and pdfrw) that are
capable, to a greater or lesser extent, of reading in PDFs and giving
you the data from them, which you can then do your replacement on and
then write back out.  I would imagine this would be a piece of cake
with pagecatcher.  (I noticed you just posted on the reportlab mailing
list, but you did not specifically mention pagecatcher.)  It will
probably take more work with either of the other two.  It is probable
that none of them do exactly what you want, but also that any of them
is a better starting point than coding what you want from scratch.

Regards,
Pat


From lists at cheimes.de  Wed Mar 17 11:14:38 2010
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 17 Mar 2010 16:14:38 +0100
Subject: Structure accessible by attribute name or index
In-Reply-To: <189ec016-9c2e-44ac-b01a-c264f165c30d@30g2000yqi.googlegroups.com>
References: <189ec016-9c2e-44ac-b01a-c264f165c30d@30g2000yqi.googlegroups.com>
Message-ID: <hnqrku$3ao$1@dough.gmane.org>

Wes Santee wrote:
> I am very new to Python, and trying to figure out how to create an
> object that has values that are accessible either by attribute name,
> or by index.  For example, the way os.stat() returns a stat_result or
> pwd.getpwnam() returns a struct_passwd.
> 
> In trying to figure it out, I've only come across C implementations of
> the above types.  Nothing specifically in Python.  What is the Python
> native way to create this kind of object?
> 
> I apologize if this has been widely covered already.  In searching for
> an answer, I must be missing some fundamental concept that is
> excluding me from finding an answer.

You can't use the same implementation as the result object of os.stat()
and others. However Python 2.6 has a new factory that creates a similar
datatype called named tuple:
http://docs.python.org/library/collections.html#namedtuple-factory-function-for-tuples-with-named-fields



From sparks.m at gmail.com  Wed Mar 17 11:16:49 2010
From: sparks.m at gmail.com (Michael Sparks)
Date: Wed, 17 Mar 2010 08:16:49 -0700 (PDT)
Subject: Nested Scopes unintended behaviour ?
Message-ID: <7a110632-d6c5-446b-a34b-95548fadb2f9@r27g2000yqn.googlegroups.com>

Hi,


Is the following behaviour expected ?

Python 2.6.4 (r264:75706, Dec  7 2009, 18:45:15)
[GCC 4.4.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> def Toggler(F, B):
...     print F("Hello")
...     print F("Hello")
...     print F("Hello")
...     print F("Hello")
...     print F("Hello")
...
>>> def Switcher(A,B):
...     on=True
...     def swtchfun(msg):
...         on_ = on
...         if on:
...             on = False
...             print "Switched to A"
...             return A
...         else:
...             print "Switched to B"
...             return B
...     #
...     return Toggler(swtchfun,True)
...
>>> Switcher(1,2)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 13, in Switcher
  File "<stdin>", line 2, in Toggler
  File "<stdin>", line 4, in swtchfun
UnboundLocalError: local variable 'on' referenced before assignment

The reason I ask is because logically it makes sense. The on_ = on
statement should resolve "on" to be the value on in the enclosing
scope, however it appears that the "on = False" statement is taking
priority. The reason I say this is because if you remove the "on =
False" line you get the expected name resolution:

>>> def Toggler(F, B):
...     print F("Hello")
...     print F("Hello")
...     print F("Hello")
...     print F("Hello")
...     print F("Hello")
...
>>> def Switcher(A,B):
...     on=True
...     def swtchfun(msg):
...         on_ = on
...         if on:
...             print "Switched to A"
...             return A
...         else:
...             print "Switched to B"
...             return B
...     #
...     return Toggler(swtchfun,True)
...
>>> Switcher(1,2)
Switched to A
1

ie it looks like python is not looking at the expected scope in the
first instance.

To me it looks like a bug, but I can also see a rationale where it's
considered a feature (because the "on" is on the left hand side
resolving the value to a local, rather than a value in an enclosed
scope)

I know that you can work around this as follows:
Python 2.6.4 (r264:75706, Dec  7 2009, 18:45:15)
[GCC 4.4.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> def Toggler(F, B):
...     print F("Hello")
...     print F("Hello")
...     print F("Hello")
...     print F("Hello")
...
>>> def Switcher(A,B):
...     def switchgen():
...         while True:
...             yield A
...             yield B
...     G = switchgen()
...     def swtchfun(msg):
...         return G.next()
...     #
...     return Toggler(swtchfun,True)
...
>>>
>>> Switcher(1,2)
1
2
1
2

But I'm curious as to whether the nested scope issue above is
considered a bug or a feature, so I can deal with it appropriately.

Any comments welcome :-)

Regards,


Michael.
--
http://yeoldeclue.com/blog
http://www.kamaelia.org/Home.html
http://twitter.com/kamaelian





From philip at semanchuk.com  Wed Mar 17 11:26:51 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Wed, 17 Mar 2010 11:26:51 -0400
Subject: multiprocessing on freebsd
In-Reply-To: <f1121800-f416-4455-b223-dfa562edb853@t23g2000yqt.googlegroups.com>
References: <f1121800-f416-4455-b223-dfa562edb853@t23g2000yqt.googlegroups.com>
Message-ID: <54550297-2B41-4A5B-8A0B-9ABF7B22D4B6@semanchuk.com>


On Mar 17, 2010, at 9:30 AM, Tim Arnold wrote:

> Hi,
> I'm checking to see if multiprocessing works on freebsd for any
> version of python. My server is about to get upgraded from 6.3 to 8.0
> and I'd sure like to be able to use multiprocessing.
>
> I think the minimal test would be:
> ---------------------
> import multiprocessing
> q = multiprocessing.Queue()
> ---------------------
>
> with 6.3, I get
>
> File "/usr/local/lib/python2.6/multiprocessing/__init__.py", line
> 212, in Queue
>    from multiprocessing.queues import Queue
>  File "/usr/local/lib/python2.6/multiprocessing/queues.py", line 22,
> in <module>
>    from multiprocessing.synchronize import Lock, BoundedSemaphore,
> Semaphore, Condition
>  File "/usr/local/lib/python2.6/multiprocessing/synchronize.py", line
> 33, in <module>
>    " function, see issue 3770.")
> ImportError: This platform lacks a functioning sem_open
> implementation, therefore, the required synchronization primitives
> needed will not function, see issue 3770.

Hi Tim,
Under FreeBSD 8/Python 2.6.2 I get the same result, unfortunately.  
That's a pity because sem_open works under FreeBSD >= 7.2 as we  
discussed before.


Issue 3770 is closed with the note, "we've removed hard-coded platform  
variables for a better autoconf approach." I'm using the Python built  
from FreeBSD's ports, and the note makes me think that it's possible  
that if I built my own Python from the Python.org tarball rather than  
ports the problem would go away due to autoconf magic. I don't have  
the time to offer to do this for you, unfortunately. But why not  
install FreeBSD 8 under VirtualBox or somesuch and give it a go  
yourself?

A couple of quirks I noted related to FreeBSD & POSIX IPC that you  
might find useful --
- The sem and mqueuefs kernel modules must be loaded, otherwise you'll  
get a message like this when you try to create a semaphore or message  
queue:
Bad system call: 12 (core dumped)

Under 8.0 they're loaded by default, I think.

- C apps that want to use message queues must link to the realtime  
libs (pass -lrt to the linker). This tripped me up for a while.  
Linking to the realtime libs is required for all POSIX IPC calls under  
Linux; FreeBSD does not require it for semaphores or shared mem, only  
message queues.


Hope this helps
Philip




From bruno.42.desthuilliers at websiteburo.invalid  Wed Mar 17 11:34:33 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 17 Mar 2010 16:34:33 +0100
Subject: Structure accessible by attribute name or index
In-Reply-To: <189ec016-9c2e-44ac-b01a-c264f165c30d@30g2000yqi.googlegroups.com>
References: <189ec016-9c2e-44ac-b01a-c264f165c30d@30g2000yqi.googlegroups.com>
Message-ID: <4ba0f67a$0$17757$426a74cc@news.free.fr>

Wes Santee a ?crit :
> I am very new to Python, and trying to figure out how to create an
> object that has values that are accessible either by attribute name,
> or by index.  For example, the way os.stat() returns a stat_result or
> pwd.getpwnam() returns a struct_passwd.
> 
> In trying to figure it out, I've only come across C implementations of
> the above types.  Nothing specifically in Python.  What is the Python
> native way to create this kind of object?

Using the appropriate __magicmethods__ for indexed access and computed 
attributes for the attribute access might be a good solution:

# warning : Q&D implementation, would require some sanity checks.

class IndexedValueDescriptor(object):
     def __init__(self, index):
         self._index = index
     def __get__(self, instance, cls):
         if instance is None:
             return self
         return instance[self._index]
     def __set__(self, instance, value):
         instance[self._index] = value

class Structure(object):
     def __init__(self, value1, value2, value3):
         self._values = [value1, value2, value3]
     def __setitem__(self, index, value):
         self._values[index] = value
     def __getitem__(self, index):
         return self._values[index]
     value1 = IndexedValueDescriptor(0)
     value2 = IndexedValueDescriptor(1)
     value3 = IndexedValueDescriptor(2)




Note that there are probably other solutions... Don't know how 
os.stat_result is implemented, might be worth looking at the source 
code. But anyway : the above should get you started.

> I apologize if this has been widely covered already.   In searching for
> an answer, I must be missing some fundamental concept that is
> excluding me from finding an answer.

Well, that's not really a FAQ AFAICT !-)


From bruno.42.desthuilliers at websiteburo.invalid  Wed Mar 17 11:35:41 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 17 Mar 2010 16:35:41 +0100
Subject: Structure accessible by attribute name or index
In-Reply-To: <mailman.918.1268838898.23598.python-list@python.org>
References: <189ec016-9c2e-44ac-b01a-c264f165c30d@30g2000yqi.googlegroups.com>
	<mailman.918.1268838898.23598.python-list@python.org>
Message-ID: <4ba0f6be$0$17757$426a74cc@news.free.fr>

Christian Heimes a ?crit :
> However Python 2.6 has a new factory that creates a similar
> datatype called named tuple:
> http://docs.python.org/library/collections.html#namedtuple-factory-function-for-tuples-with-named-fields
> 

Duh... Should spend some more time reading 2.6's What's New :(


From emile at fenx.com  Wed Mar 17 11:44:03 2010
From: emile at fenx.com (Emile van Sebille)
Date: Wed, 17 Mar 2010 08:44:03 -0700
Subject: Nested Scopes unintended behaviour ?
In-Reply-To: <7a110632-d6c5-446b-a34b-95548fadb2f9@r27g2000yqn.googlegroups.com>
References: <7a110632-d6c5-446b-a34b-95548fadb2f9@r27g2000yqn.googlegroups.com>
Message-ID: <hnqtbp$bbb$1@dough.gmane.org>

On 3/17/2010 8:16 AM Michael Sparks said...
> Hi,
>
>
> Is the following behaviour expected ?

In short, yes.  Assignment within a function forces the variable to 
locals.  You can get around it like:

>
> Python 2.6.4 (r264:75706, Dec  7 2009, 18:45:15)
> [GCC 4.4.1] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> def Toggler(F, B):
> ...     print F("Hello")
> ...     print F("Hello")
> ...     print F("Hello")
> ...     print F("Hello")
> ...     print F("Hello")
> ...
>>>> def Switcher(A,B):
> ...     on=True
> ...     def swtchfun(msg):

--->      def swtchfun(msg, on=on):

> ...         on_ = on
> ...         if on:
> ...             on = False
> ...             print "Switched to A"
> ...             return A
> ...         else:
> ...             print "Switched to B"
> ...             return B
> ...     #
> ...     return Toggler(swtchfun,True)
> ...
>>>> Switcher(1,2)
> Traceback (most recent call last):
>    File "<stdin>", line 1, in<module>
>    File "<stdin>", line 13, in Switcher
>    File "<stdin>", line 2, in Toggler
>    File "<stdin>", line 4, in swtchfun
> UnboundLocalError: local variable 'on' referenced before assignment
>
> The reason I ask is because logically it makes sense. The on_ = on
> statement should resolve "on" to be the value on in the enclosing
> scope, however it appears that the "on = False" statement is taking
> priority. The reason I say this is because if you remove the "on =
> False" line you get the expected name resolution:
>
>>>> def Toggler(F, B):
> ...     print F("Hello")
> ...     print F("Hello")
> ...     print F("Hello")
> ...     print F("Hello")
> ...     print F("Hello")
> ...
>>>> def Switcher(A,B):
> ...     on=True
> ...     def swtchfun(msg):
> ...         on_ = on
> ...         if on:
> ...             print "Switched to A"
> ...             return A
> ...         else:
> ...             print "Switched to B"
> ...             return B
> ...     #
> ...     return Toggler(swtchfun,True)
> ...
>>>> Switcher(1,2)
> Switched to A
> 1
>
> ie it looks like python is not looking at the expected scope in the
> first instance.
>
> To me it looks like a bug, but I can also see a rationale where it's
> considered a feature (because the "on" is on the left hand side
> resolving the value to a local, rather than a value in an enclosed
> scope)
>
> I know that you can work around this as follows:
> Python 2.6.4 (r264:75706, Dec  7 2009, 18:45:15)
> [GCC 4.4.1] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> def Toggler(F, B):
> ...     print F("Hello")
> ...     print F("Hello")
> ...     print F("Hello")
> ...     print F("Hello")
> ...
>>>> def Switcher(A,B):
> ...     def switchgen():
> ...         while True:
> ...             yield A
> ...             yield B
> ...     G = switchgen()
> ...     def swtchfun(msg):
> ...         return G.next()
> ...     #
> ...     return Toggler(swtchfun,True)
> ...
>>>>
>>>> Switcher(1,2)
> 1
> 2
> 1
> 2
>
> But I'm curious as to whether the nested scope issue above is
> considered a bug or a feature, so I can deal with it appropriately.
>
> Any comments welcome :-)
>
> Regards,
>
>
> Michael.
> --
> http://yeoldeclue.com/blog
> http://www.kamaelia.org/Home.html
> http://twitter.com/kamaelian
>
>
>




From nobody at nowhere.com  Wed Mar 17 11:44:34 2010
From: nobody at nowhere.com (Nobody)
Date: Wed, 17 Mar 2010 15:44:34 +0000
Subject: execute bash builtins in python
References: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com>
	<mailman.660.1268399795.23598.python-list@python.org>
Message-ID: <pan.2010.03.17.15.44.34.750000@nowhere.com>

On Fri, 12 Mar 2010 08:15:49 -0500, Steve Holden wrote:

> For shell=True I believe you should provide the command as a single
> string, not a list of arguments.

Using shell=True with an argument list is valid.

On Unix, it's seldom what you want: it will invoke /bin/sh to execute the
first argument with $1, $2, ... set from the remaining arguments.

On Windows, a list is converted to a string in the same manner regardless
of the value of the "shell" argument. Specifying shell=True causes the
command string to be executed via "cmd /c ...". This allows the "program"
to be a script, whereas shell=False requires the program to be a binary
executable.



From python at hope.cz  Wed Mar 17 11:47:07 2010
From: python at hope.cz (Johny)
Date: Wed, 17 Mar 2010 08:47:07 -0700 (PDT)
Subject: pkg-config and Windows
Message-ID: <e3c426e9-2696-4cb0-814a-dbb1db16ee37@33g2000yqj.googlegroups.com>

I have a program that needs to be installed with setup.py. But there
is a problem when I am trying to install the program with setup.py in
Windows. When I try to install with

python setup.py install
it goes like this

C:\>python setup.py install
 running install
 running build
 running build_py
 running build_ext
 ERROR: Could not find pkg-config!

As you can see
the installation finishes with the error:
Could not find pkg-config!

Is there any way how to find out pkg-config in Windows?
or how to solve the problem?
Thanks
L.



From tundra at tundraware.com  Wed Mar 17 12:32:45 2010
From: tundra at tundraware.com (Tim Daneliuk)
Date: Wed, 17 Mar 2010 11:32:45 -0500
Subject: Win32All On 64-Bit Operating Systems
Message-ID: <fpc777-2iu1.ln1@ozzie.tundraware.com>

I have a pure-Python program developed on a POSIX platform (FreeBSD) that
I'd like to make fully compatible with Windows systems as well.  The only
conflict arises insofar as this program makes considerable use of the
stat UID and GID values, as well as their corresponding user- and group
names.  Since Windows has not grp and pwd modules, I need to synthesize
this.

In the past, I've solved this problem by detecting the presence of Win32All.
If present, I do the necessary magic to return the true UID/name, GID/name
info from Windows itself.  If not, I return UID/GID as provided by an
os.stat call and use the phoby names "winuser" and "wingroup" respectively.

Now for the question:  Is there even an instance of Win32All for 64-bit
OSs like Vista and Win7?  If not, I'm inclined not bother with it at all
and just return the phony values as placeholders because I do not want
different features on 32- and 64-bit platforms.

Thanks,
-- 
----------------------------------------------------------------------------
Tim Daneliuk     tundra at tundraware.com
PGP Key:         http://www.tundraware.com/PGP/



From wsantee at gmail.com  Wed Mar 17 12:40:44 2010
From: wsantee at gmail.com (Wes Santee)
Date: Wed, 17 Mar 2010 09:40:44 -0700 (PDT)
Subject: Structure accessible by attribute name or index
References: <189ec016-9c2e-44ac-b01a-c264f165c30d@30g2000yqi.googlegroups.com>
	<mailman.918.1268838898.23598.python-list@python.org>
Message-ID: <23c6223c-cc65-44e2-a400-aba5d0a010a6@m37g2000yqf.googlegroups.com>

On Mar 17, 11:14?am, Christian Heimes <li... at cheimes.de> wrote:
> Wes Santee wrote:
> > I am very new to Python, and trying to figure out how to create an
> > object that has values that are accessible either by attribute name,
> > or by index. ?For example, the way os.stat() returns a stat_result or
> > pwd.getpwnam() returns a struct_passwd.
>
> > In trying to figure it out, I've only come across C implementations of
> > the above types. ?Nothing specifically in Python. ?What is the Python
> > native way to create this kind of object?
>
> > I apologize if this has been widely covered already. ?In searching for
> > an answer, I must be missing some fundamental concept that is
> > excluding me from finding an answer.
>
> You can't use the same implementation as the result object of os.stat()
> and others. However Python 2.6 has a new factory that creates a similar
> datatype called named tuple:http://docs.python.org/library/collections.html#namedtuple-factory-fu...

Thanks for the pointer.  At least I know there is a reason why I
wasn't finding a solution. :)



From wsantee at gmail.com  Wed Mar 17 12:55:07 2010
From: wsantee at gmail.com (Wes Santee)
Date: Wed, 17 Mar 2010 09:55:07 -0700 (PDT)
Subject: Structure accessible by attribute name or index
References: <189ec016-9c2e-44ac-b01a-c264f165c30d@30g2000yqi.googlegroups.com>
	<4ba0f67a$0$17757$426a74cc@news.free.fr>
Message-ID: <2e0ba087-eb30-460e-a6e2-b29498669107@33g2000yqj.googlegroups.com>

On Mar 17, 11:34?am, Bruno Desthuilliers <bruno.
42.desthuilli... at websiteburo.invalid> wrote:
> Wes Santee a ?crit :
>
> > I am very new to Python, and trying to figure out how to create an
> > object that has values that are accessible either by attribute name,
> > or by index. ?For example, the way os.stat() returns a stat_result or
> > pwd.getpwnam() returns a struct_passwd.
>
> > In trying to figure it out, I've only come across C implementations of
> > the above types. ?Nothing specifically in Python. ?What is the Python
> > native way to create this kind of object?
>
> Using the appropriate __magicmethods__ for indexed access and computed
> attributes for the attribute access might be a good solution:

This is as good an excuse as any to get familiar with the rest of the
__magicmethods__. :)

>
> # warning : Q&D implementation, would require some sanity checks.
>
> class IndexedValueDescriptor(object):
> ? ? ?def __init__(self, index):
> ? ? ? ? ?self._index = index
> ? ? ?def __get__(self, instance, cls):
> ? ? ? ? ?if instance is None:
> ? ? ? ? ? ? ?return self
> ? ? ? ? ?return instance[self._index]
> ? ? ?def __set__(self, instance, value):
> ? ? ? ? ?instance[self._index] = value
>
> class Structure(object):
> ? ? ?def __init__(self, value1, value2, value3):
> ? ? ? ? ?self._values = [value1, value2, value3]
> ? ? ?def __setitem__(self, index, value):
> ? ? ? ? ?self._values[index] = value
> ? ? ?def __getitem__(self, index):
> ? ? ? ? ?return self._values[index]
> ? ? ?value1 = IndexedValueDescriptor(0)
> ? ? ?value2 = IndexedValueDescriptor(1)
> ? ? ?value3 = IndexedValueDescriptor(2)
>
> Note that there are probably other solutions... Don't know how
> os.stat_result is implemented, might be worth looking at the source
> code. But anyway : the above should get you started.
>
> > I apologize if this has been widely covered already. ? In searching for
> > an answer, I must be missing some fundamental concept that is
> > excluding me from finding an answer.
>
> Well, that's not really a FAQ AFAICT !-)



From mail at timgolden.me.uk  Wed Mar 17 13:05:48 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 17 Mar 2010 17:05:48 +0000
Subject: Win32All On 64-Bit Operating Systems
In-Reply-To: <fpc777-2iu1.ln1@ozzie.tundraware.com>
References: <fpc777-2iu1.ln1@ozzie.tundraware.com>
Message-ID: <4BA10BEC.2080802@timgolden.me.uk>

On 17/03/2010 16:32, Tim Daneliuk wrote:
> I have a pure-Python program developed on a POSIX platform (FreeBSD) that
> I'd like to make fully compatible with Windows systems as well.  The only
> conflict arises insofar as this program makes considerable use of the
> stat UID and GID values, as well as their corresponding user- and group
> names.  Since Windows has not grp and pwd modules, I need to synthesize
> this.
>
> In the past, I've solved this problem by detecting the presence of Win32All.
> If present, I do the necessary magic to return the true UID/name, GID/name
> info from Windows itself.  If not, I return UID/GID as provided by an
> os.stat call and use the phoby names "winuser" and "wingroup" respectively.
>
> Now for the question:  Is there even an instance of Win32All for 64-bit
> OSs like Vista and Win7?  If not, I'm inclined not bother with it at all
> and just return the phony values as placeholders because I do not want
> different features on 32- and 64-bit platforms.

Looks like it:

   http://sourceforge.net/projects/pywin32/files/

but, frankly, I wouldn't bother with the uid/gid thing on
Windows. It's nearly meaningless most of the time. Just
return placeholders.

TJG


From andrej.mitrovich at gmail.com  Wed Mar 17 13:41:14 2010
From: andrej.mitrovich at gmail.com (Andrej Mitrovic)
Date: Wed, 17 Mar 2010 10:41:14 -0700 (PDT)
Subject: Python Documentation website layout changed?
Message-ID: <21fcbd63-fd1e-4b53-89b3-393c15591372@m37g2000yqf.googlegroups.com>

Hi,

What happened to the sidebar on the left of the documentation website?
It seems to be gone:

http://docs.python.org/py3k/index.html

I found it quite useful since I can quickly swap between Python2/3
documentation, and between other parts of the documentation as well.


From a_jtim at bellsouth.net  Wed Mar 17 13:57:42 2010
From: a_jtim at bellsouth.net (Tim Arnold)
Date: Wed, 17 Mar 2010 10:57:42 -0700 (PDT)
Subject: multiprocessing on freebsd
References: <f1121800-f416-4455-b223-dfa562edb853@t23g2000yqt.googlegroups.com>
	<mailman.919.1268839620.23598.python-list@python.org>
Message-ID: <4b29e714-df56-49be-a836-51d5833765f8@x12g2000yqx.googlegroups.com>

On Mar 17, 11:26?am, Philip Semanchuk <phi... at semanchuk.com> wrote:
> On Mar 17, 2010, at 9:30 AM, Tim Arnold wrote:
>
>
>
>
>
> > Hi,
> > I'm checking to see if multiprocessing works on freebsd for any
> > version of python. My server is about to get upgraded from 6.3 to 8.0
> > and I'd sure like to be able to use multiprocessing.
>
> > I think the minimal test would be:
> > ---------------------
> > import multiprocessing
> > q = multiprocessing.Queue()
> > ---------------------
>
> > with 6.3, I get
>
> > File "/usr/local/lib/python2.6/multiprocessing/__init__.py", line
> > 212, in Queue
> > ? ?from multiprocessing.queues import Queue
> > ?File "/usr/local/lib/python2.6/multiprocessing/queues.py", line 22,
> > in <module>
> > ? ?from multiprocessing.synchronize import Lock, BoundedSemaphore,
> > Semaphore, Condition
> > ?File "/usr/local/lib/python2.6/multiprocessing/synchronize.py", line
> > 33, in <module>
> > ? ?" function, see issue 3770.")
> > ImportError: This platform lacks a functioning sem_open
> > implementation, therefore, the required synchronization primitives
> > needed will not function, see issue 3770.
>
> Hi Tim,
> Under FreeBSD 8/Python 2.6.2 I get the same result, unfortunately. ?
> That's a pity because sem_open works under FreeBSD >= 7.2 as we ?
> discussed before.
>
> Issue 3770 is closed with the note, "we've removed hard-coded platform ?
> variables for a better autoconf approach." I'm using the Python built ?
> from FreeBSD's ports, and the note makes me think that it's possible ?
> that if I built my own Python from the Python.org tarball rather than ?
> ports the problem would go away due to autoconf magic. I don't have ?
> the time to offer to do this for you, unfortunately. But why not ?
> install FreeBSD 8 under VirtualBox or somesuch and give it a go ?
> yourself?
>
> A couple of quirks I noted related to FreeBSD & POSIX IPC that you ?
> might find useful --
> - The sem and mqueuefs kernel modules must be loaded, otherwise you'll ?
> get a message like this when you try to create a semaphore or message ?
> queue:
> Bad system call: 12 (core dumped)
>
> Under 8.0 they're loaded by default, I think.
>
> - C apps that want to use message queues must link to the realtime ?
> libs (pass -lrt to the linker). This tripped me up for a while. ?
> Linking to the realtime libs is required for all POSIX IPC calls under ?
> Linux; FreeBSD does not require it for semaphores or shared mem, only ?
> message queues.
>
> Hope this helps
> Philip

Hi Philip,
Thanks for that information (esp the linker info). Once the machine is
upgraded, I'll try building python from the tarball. I'll post back
here with the results.

here's hoping!
thanks,
--Tim


From sccolbert at gmail.com  Wed Mar 17 14:14:14 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Wed, 17 Mar 2010 14:14:14 -0400
Subject: execute bash builtins in python
In-Reply-To: <pan.2010.03.17.15.44.34.750000@nowhere.com>
References: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com>
	<mailman.660.1268399795.23598.python-list@python.org>
	<pan.2010.03.17.15.44.34.750000@nowhere.com>
Message-ID: <7f014ea61003171114j60aa2a2co19e138e46ea4ee4d@mail.gmail.com>

On Wed, Mar 17, 2010 at 11:44 AM, Nobody <nobody at nowhere.com> wrote:

> On Fri, 12 Mar 2010 08:15:49 -0500, Steve Holden wrote:
>
> > For shell=True I believe you should provide the command as a single
> > string, not a list of arguments.
>
> Using shell=True with an argument list is valid.
>
> On Unix, it's seldom what you want: it will invoke /bin/sh to execute the
> first argument with $1, $2, ... set from the remaining arguments.
>
> On Windows, a list is converted to a string in the same manner regardless
> of the value of the "shell" argument. Specifying shell=True causes the
> command string to be executed via "cmd /c ...". This allows the "program"
> to be a script, whereas shell=False requires the program to be a binary
> executable.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


if you can work interactively, save yourself the headache and just use
Ipython:

brucewayne at broo:~$ ipython
Python 2.6.4 (r264:75706, Dec  7 2009, 18:43:55)
Type "copyright", "credits" or "license" for more information.

IPython 0.10 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object'. ?object also works, ?? prints more.

In [1]: alias
Total number of aliases: 15
Out[1]:
[('cat', 'cat'),
 ('clear', 'clear'),
 ('less', 'less'),
 ('mkdir', 'mkdir'),
 ('rmdir', 'rmdir'),
 ('cp', 'cp -i'),
 ('lc', 'ls -F -o --color'),
 ('ldir', 'ls -F -o --color %l | grep /$'),
 ('lf', 'ls -F -o --color %l | grep ^-'),
 ('lk', 'ls -F -o --color %l | grep ^l'),
 ('ll', 'ls -lF'),
 ('ls', 'ls -F'),
 ('lx', 'ls -F -o --color %l | grep ^-..x'),
 ('mv', 'mv -i'),
 ('rm', 'rm -i')]

In [2]:
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20100317/b42baeab/attachment.html>

From andrej.mitrovich at gmail.com  Wed Mar 17 14:16:42 2010
From: andrej.mitrovich at gmail.com (Andrej Mitrovic)
Date: Wed, 17 Mar 2010 11:16:42 -0700 (PDT)
Subject: Python Documentation website layout changed?
References: <21fcbd63-fd1e-4b53-89b3-393c15591372@m37g2000yqf.googlegroups.com>
Message-ID: <27c7e0a7-5a26-40f2-94ba-0af9cb530d67@g28g2000yqh.googlegroups.com>

On Mar 17, 6:41?pm, Andrej Mitrovic <andrej.mitrov... at gmail.com>
wrote:
> Hi,
>
> What happened to the sidebar on the left of the documentation website?
> It seems to be gone:
>
> http://docs.python.org/py3k/index.html
>
> I found it quite useful since I can quickly swap between Python2/3
> documentation, and between other parts of the documentation as well.

Edit: It looks like only the Python 3 pages are affected, the Python 2
pages are the same as before:

http://docs.python.org/index.html

Might be a bug?


From steve at holdenweb.com  Wed Mar 17 14:34:17 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 17 Mar 2010 14:34:17 -0400
Subject: Python Documentation website layout changed?
In-Reply-To: <27c7e0a7-5a26-40f2-94ba-0af9cb530d67@g28g2000yqh.googlegroups.com>
References: <21fcbd63-fd1e-4b53-89b3-393c15591372@m37g2000yqf.googlegroups.com>
	<27c7e0a7-5a26-40f2-94ba-0af9cb530d67@g28g2000yqh.googlegroups.com>
Message-ID: <4BA120A9.3060001@holdenweb.com>

Andrej Mitrovic wrote:
> On Mar 17, 6:41 pm, Andrej Mitrovic <andrej.mitrov... at gmail.com>
> wrote:
>> Hi,
>>
>> What happened to the sidebar on the left of the documentation website?
>> It seems to be gone:
>>
>> http://docs.python.org/py3k/index.html
>>
>> I found it quite useful since I can quickly swap between Python2/3
>> documentation, and between other parts of the documentation as well.
> 
> Edit: It looks like only the Python 3 pages are affected, the Python 2
> pages are the same as before:
> 
> http://docs.python.org/index.html
> 
> Might be a bug?

I'll ask. Georg - is this known behavior or a temporary problem?

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From anthra.norell at bluewin.ch  Wed Mar 17 14:43:00 2010
From: anthra.norell at bluewin.ch (Anthra Norell)
Date: Wed, 17 Mar 2010 19:43:00 +0100
Subject: How to access a web site with an authentication template.
Message-ID: <4BA122B4.5030003@bluewin.ch>

Hi all,

   I have spent the better part of this day reading docs and googling 
archives to no avail. About this: I understand that I can access 
password protected sites with urllib2. However, the protocol seems to 
be: I try without password and catch the error coming back. The header 
will then tell me what the server expects in the line of formats. That 
doesn't work with a site I am dealing with, because the opening page 
does not require a password. It presents an id/password entry template 
and I have no clue how to respond in python. The page source is chock 
full of java script. The header--if that means anything--is:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang = "en-us">

<head id="ctl00_Head1"><meta http-equiv="Content-Type" 
content="text/html; charset=UTF-8" />
<link id="ctl00_glbalLayoutCSS" rel="stylesheet" type="text/css" 
href="/cve/p/6/Default/Styles/global_layout.css" />
... more CSS
<!--  Site level default.  The only time a firm.css is required is for 
segment variations.  -->

I don't expect solutions, but rather pointers to relevant reading.

Thanks

Frederic




From tundra at tundraware.com  Wed Mar 17 15:07:14 2010
From: tundra at tundraware.com (Tim Daneliuk)
Date: Wed, 17 Mar 2010 14:07:14 -0500
Subject: Win32All On 64-Bit Operating Systems
In-Reply-To: <mailman.921.1268845558.23598.python-list@python.org>
References: <fpc777-2iu1.ln1@ozzie.tundraware.com>
	<mailman.921.1268845558.23598.python-list@python.org>
Message-ID: <3rl777-q1m2.ln1@ozzie.tundraware.com>

On 3/17/2010 12:05 PM, Tim Golden wrote:
> On 17/03/2010 16:32, Tim Daneliuk wrote:
>> I have a pure-Python program developed on a POSIX platform (FreeBSD) that
>> I'd like to make fully compatible with Windows systems as well.  The only
>> conflict arises insofar as this program makes considerable use of the
>> stat UID and GID values, as well as their corresponding user- and group
>> names.  Since Windows has not grp and pwd modules, I need to synthesize
>> this.
>>
>> In the past, I've solved this problem by detecting the presence of
>> Win32All.
>> If present, I do the necessary magic to return the true UID/name,
>> GID/name
>> info from Windows itself.  If not, I return UID/GID as provided by an
>> os.stat call and use the phoby names "winuser" and "wingroup"
>> respectively.
>>
>> Now for the question:  Is there even an instance of Win32All for 64-bit
>> OSs like Vista and Win7?  If not, I'm inclined not bother with it at all
>> and just return the phony values as placeholders because I do not want
>> different features on 32- and 64-bit platforms.
> 
> Looks like it:
> 
>   http://sourceforge.net/projects/pywin32/files/

Thanks!

> 
> but, frankly, I wouldn't bother with the uid/gid thing on
> Windows. It's nearly meaningless most of the time. Just
> return placeholders.
> 
> TJG

That's not really so. Windows definitely has the notions of users and groups,
they just don't quite align with the POSIX model exactly.

-- 
----------------------------------------------------------------------------
Tim Daneliuk     tundra at tundraware.com
PGP Key:         http://www.tundraware.com/PGP/



From xahlee at gmail.com  Wed Mar 17 15:17:28 2010
From: xahlee at gmail.com (Xah Lee)
Date: Wed, 17 Mar 2010 12:17:28 -0700 (PDT)
Subject: to RG - Lisp lunacy and Perl psychosis
References: <19c5b00d-c1e0-4016-9f72-37229cbf42b9@g19g2000yqe.googlegroups.com>
	<79tk67-rp51.ln1@osiris.mauzo.dyndns.org>
Message-ID: <6ede3156-9e9c-45ed-a532-89f5825646ea@p3g2000pra.googlegroups.com>

2010-03-17

On Mar 10, 9:17?am, Ben Morrow <b... at morrow.me.uk> wrote:
> Also, flamebait language-comparison xposts involving Lisp are one
> of Xah Lee's trademarks. You might want to look into not imitating
> him/her/it.

being a professional programer today, typically you know more than
just one language. Practical questions, discussions, involving more
than one language is natural, and in fact happens more and more often
in online forums over the past 15 years i've seen. Partly due to, of
course, the tremendous birth of languages in the past decade.

In the 1980s or 1990s, you don't typically use more than one lang in a
project. Today, probably majority of projects requires you to use more
than one well known general purpose language. In those times,
discussion of more than one language is usually academic comparison.
Today, honest post as ?i know this in X but how you do in Y? is a
common need.

The reason they become flame wars is mostly not about the message
content. More about tech geeker's sensitivity, with the carried over
old school netiquette that any person mentioning lang x in group y
must be of no good intentions.

If you look at online forums today, in fact most comp lang forums have
no problem in mentioning or discussion different languages in context.
The problem occur more frequently in free-for-all type of forums where
the know-it-all tech geekers reside (the in-group argot is ?hacker?),
each thinking they are justice kings and queens, take opportunities to
ridicule, flame, any post that mention other lang or any thing that
doesn't seem to be protective of their lang. This is comp.lang.*
newsgroups, with good as well as mostly bad aspects. Of course, the
free-for-all nature is precisely the reason most tech geekers stay in
newsgroups. A good percentage of them, if not majority, are old
timers.

Most newsgroup tech geekers consider cross-posting wrong. I consider
such taboo in this convention being a major contribution to the
redundant creation of new languages, flaws, and foster the hostile
faction nature of programing language groups we see.

It is sad to say, comp.lang.lisp today is 90% machine generated spam.
You see that each time this is brought up in the past 3 years, the
regulars are too busy boasting about how they've set up some tech geek
system so that spam don't reach their eyes, and sternly sputter about
web browser using idiots, with, profuse suggestions from their
infinite knowledge about what newsgroup reading software people should
be using.

To the comp.lang.python people, i think perhaps it is fruitful now to
think about de-coupling the newsgroup from the mailing list... am not
very involved in the comp.lang.python or python community in recent
years, but my thought is that, i got the feeling that most practical
posts happen in the mailing list and the newsgroup ones tend to be
more free flow of thoughts... so perhaps de-couple them is good,
because python is main stream now and mailing list is sustainable
large, is good for more practical, concrete questions and answers, and
philosophical free thoughts still have a place to go, in newsgroups.

further readings:

? Proliferation of Computing Languages
  xahlee.org/UnixResource_dir/writ/new_langs.html

? Tech Geekers vs Spammers
  xahlee.org/UnixResource_dir/writ/tech_geekers_vs_spammers.html

? Cross-posting & Language Factions
  xahlee.org/Netiquette_dir/cross-post.html

  Xah
? http://xahlee.org/

?


From martin.hellwig at dcuktec.org  Wed Mar 17 15:25:44 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Wed, 17 Mar 2010 19:25:44 +0000
Subject: multiprocessing on freebsd
In-Reply-To: <f1121800-f416-4455-b223-dfa562edb853@t23g2000yqt.googlegroups.com>
References: <f1121800-f416-4455-b223-dfa562edb853@t23g2000yqt.googlegroups.com>
Message-ID: <hnrabj$c4v$1@news.eternal-september.org>

On 03/17/10 13:30, Tim Arnold wrote:
> Hi,
> I'm checking to see if multiprocessing works on freebsd for any
> version of python. My server is about to get upgraded from 6.3 to 8.0
> and I'd sure like to be able to use multiprocessing.
>
> I think the minimal test would be:
> ---------------------
> import multiprocessing
> q = multiprocessing.Queue()
> ---------------------
>
> with 6.3, I get
>
>   File "/usr/local/lib/python2.6/multiprocessing/__init__.py", line
> 212, in Queue
>      from multiprocessing.queues import Queue
>    File "/usr/local/lib/python2.6/multiprocessing/queues.py", line 22,
> in<module>
>      from multiprocessing.synchronize import Lock, BoundedSemaphore,
> Semaphore, Condition
>    File "/usr/local/lib/python2.6/multiprocessing/synchronize.py", line
> 33, in<module>
>      " function, see issue 3770.")
> ImportError: This platform lacks a functioning sem_open
> implementation, therefore, the required synchronization primitives
> needed will not function, see issue 3770.
>

Build mine from ports, with the following options (notice SEM & PTH):
[martin at aspire8930 /usr/home/martin]$ cat /var/db/ports/python26/options
# This file is auto-generated by 'make config'.
# No user-servicable parts inside!
# Options for python26-2.6.4
_OPTIONS_READ=python26-2.6.4
WITH_THREADS=true
WITHOUT_HUGE_STACK_SIZE=true
WITH_SEM=true
WITH_PTH=true
WITH_UCS4=true
WITH_PYMALLOC=true
WITH_IPV6=true
WITHOUT_FPECTL=true

[martin at aspire8930 /usr/home/martin]$ uname -a
FreeBSD aspire8930 8.0-STABLE FreeBSD 8.0-STABLE #3: Wed Feb  3 17:01:18 
GMT 2010     martin at aspire8930:/usr/obj/usr/src/sys/ASPIRE8930  amd64
[martin at aspire8930 /usr/home/martin]$ python
Python 2.6.4 (r264:75706, Mar 17 2010, 18:44:24)
[GCC 4.2.1 20070719  [FreeBSD]] on freebsd8
Type "help", "copyright", "credits" or "license" for more information.
 >>> import multiprocessing as mp
 >>> queue = mp.Queue()
 >>>

hth
-- 
mph


From tjreedy at udel.edu  Wed Mar 17 15:55:35 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 17 Mar 2010 15:55:35 -0400
Subject: to pass self or not to pass self
In-Reply-To: <4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com>
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>	<4b9f4984$0$10229$426a74cc@news.free.fr>	<mailman.860.1268765949.23598.python-list@python.org>
	<4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com>
Message-ID: <hnrc3p$a6t$1@dough.gmane.org>

On 3/17/2010 1:35 AM, Patrick Maupin wrote:
>>>> def a(s, count, lenfunc):
> ...     for i in xrange(count):
> ...        z = lenfunc(s)
> ...
>>>> >>>  a('abcdef', 100000000, len)
>>>> >>>  a('abcdef', 100000000, str.__len__)
> Running cPython 2.6 on my machine, len() runs about 3 times faster
> than str.__len__().  The overhead of checking that an object is usable
> with a particular class method far outweighs the cost of creating the
> bound method!

Wow, this so surprised me, that I had to try it with 3.1 (on winxp), and 
got a similar result (about 2.6x longer with str.__len__). This is a 
real lesson in measure, don't guess, and how premature 'optimization' 
may be a pessimization. Thanks.

Terry Jan Reedy





From mail at timgolden.me.uk  Wed Mar 17 15:59:57 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 17 Mar 2010 19:59:57 +0000
Subject: Win32All On 64-Bit Operating Systems
In-Reply-To: <3rl777-q1m2.ln1@ozzie.tundraware.com>
References: <fpc777-2iu1.ln1@ozzie.tundraware.com>	<mailman.921.1268845558.23598.python-list@python.org>
	<3rl777-q1m2.ln1@ozzie.tundraware.com>
Message-ID: <4BA134BD.8060704@timgolden.me.uk>

On 17/03/2010 19:07, Tim Daneliuk wrote:
> That's not really so. Windows definitely has the notions of users and groups,
> they just don't quite align with the POSIX model exactly.

Yes, my comment was a little blase. I know that Windows has users & groups:

http://timgolden.me.uk/python/win32_how_do_i/get-the-owner-of-a-file.html

:)

I was thinking that you wanted a naive transfer of the Posix concept.
The "owner" of a file does mean something to Windows (while the "group"
really doesn't; it's just an artefact of Windows' posix-compatibility)
but not as much as it does on Posix systems, because the security system
is much more sophisticated.

But maybe I'm teaching my grandmother to suck eggs ?

TJG


From tjreedy at udel.edu  Wed Mar 17 16:12:11 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 17 Mar 2010 16:12:11 -0400
Subject: Python bindings tutorial
In-Reply-To: <hnqhao$o9m$1@dough.gmane.org>
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>	<mailman.863.1268766752.23598.python-list@python.org>	<98447f7e-64db-4a10-b19e-685f5b079cf6@l25g2000yqd.googlegroups.com>	<hnq7qt$kl0$1@dough.gmane.org>	<4BA0B985.3060501@ieee.org>
	<hnqhao$o9m$1@dough.gmane.org>
Message-ID: <hnrd2s$e92$1@dough.gmane.org>

On 3/17/2010 8:18 AM, Stefan Behnel wrote:
> Dave Angel, 17.03.2010 12:14:
>> Stefan Behnel wrote:
>>> I think the point here is that executable binaries are not supposed to
>>> be used as libraries. Libraries are. That's the difference between a
>>> DLL and an executable in the first place. To run an executable,
>>> execute it. The subprocess module is the tool of choice here. To use a
>>> DLL, link against it.
>>>
>> There's no real reason parts of an exe cannot be exported, same as a
>> dll. They are in fact the same structure. And in fact many other files
>> in the Windows environment are also the same structure, from fonts to
>> ocx's
>
> So, because you can, you'd also try to link against fonts then, I guess?
>
> I hope you notice that what you and me said isn't contradictory. But
> there's a reason why there are libraries and executables, and there's no
> reason you *should* export anything from an executable - that's what
> libraries are there for. That's my point.

To put it another way, if an executable has functions that could/should 
be available as 'library' functions, then they can/should be put in a 
separate library file for use as such and called from a smaller .exe.

This is what python itself does. For 3.1 on winxp, python.exe is only 26 
Kb, while python31.dll, with all the builtin functions and classes, (in 
windows/system32) is 2072 KB.
>
> Besides, nothing guarantees that it's safe to call stuff that an
> executable exports. The executable may well require some setup code that
> it only executes when it is properly started.

Terry Jan Reedy



From tjreedy at udel.edu  Wed Mar 17 16:21:08 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 17 Mar 2010 16:21:08 -0400
Subject: question about tkinter
In-Reply-To: <CD942CDF-0D69-421E-8047-6EDFC7274873@haystack.mit.edu>
References: <mailman.903.1268829586.23598.python-list@python.org>	<hnqjoo$g4o$02$1@news.t-online.com>	<mailman.906.1268832771.23598.python-list@python.org>	<hnqn7l$645$03$1@news.t-online.com>
	<CD942CDF-0D69-421E-8047-6EDFC7274873@haystack.mit.edu>
Message-ID: <hnrdjm$gdj$1@dough.gmane.org>

On 3/17/2010 10:33 AM, robert schaefer wrote:
> No, And there's a reason (perhaps not a great one - but I'm got some constraints).

>   Related to that I tailored Ipython to work with gtk (ipython's default was tkinter) - tailoring was by a command
> - is there any way to command idle to use gtk?

I am pretty sure not, the gui is hard-coded with tkinter.



From tjreedy at udel.edu  Wed Mar 17 16:29:02 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 17 Mar 2010 16:29:02 -0400
Subject: Nested Scopes unintended behaviour ?
In-Reply-To: <hnqtbp$bbb$1@dough.gmane.org>
References: <7a110632-d6c5-446b-a34b-95548fadb2f9@r27g2000yqn.googlegroups.com>
	<hnqtbp$bbb$1@dough.gmane.org>
Message-ID: <hnre2f$i2u$1@dough.gmane.org>

On 3/17/2010 11:44 AM, Emile van Sebille wrote:
> On 3/17/2010 8:16 AM Michael Sparks said...
>> Hi,
>>
>>
>> Is the following behaviour expected ?
>
> In short, yes. Assignment within a function forces the variable to
> locals.

In 3.x, one can declare names to be nonlocal (ie, local to some outer 
function, as opposed to local to the current function or module global).
In your case,
   nonlocal on
in your inner swtchfun function would give the behavior you wanted.

Terry Jan Reedy




From python at bdurham.com  Wed Mar 17 16:31:39 2010
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 17 Mar 2010 16:31:39 -0400
Subject: Converting Python CGI to WSGI scripts
In-Reply-To: <4ba0735b$0$1594$742ec2ed@news.sonic.net>
References: <1268759895.28810.1365130739@webmail.messagingengine.com><mailman.882.1268803376.23598.python-list@python.org>
	<4ba0735b$0$1594$742ec2ed@news.sonic.net>
Message-ID: <1268857899.13963.1365364051@webmail.messagingengine.com>

Sebastian/John,

Thank you very much for your feedback. 

John: I initially missed the nuance of WSGI scripts being function
calls. I suspect your tip has saved me a lot of pain :)

Regards,

Malcolm


From tundra at tundraware.com  Wed Mar 17 16:43:15 2010
From: tundra at tundraware.com (Tim Daneliuk)
Date: Wed, 17 Mar 2010 15:43:15 -0500
Subject: Win32All On 64-Bit Operating Systems
In-Reply-To: <mailman.926.1268856005.23598.python-list@python.org>
References: <fpc777-2iu1.ln1@ozzie.tundraware.com>	<mailman.921.1268845558.23598.python-list@python.org>	<3rl777-q1m2.ln1@ozzie.tundraware.com>
	<mailman.926.1268856005.23598.python-list@python.org>
Message-ID: <4fr777-43o2.ln1@ozzie.tundraware.com>

On 3/17/2010 2:59 PM, Tim Golden wrote:
> On 17/03/2010 19:07, Tim Daneliuk wrote:
>> That's not really so. Windows definitely has the notions of users and
>> groups,
>> they just don't quite align with the POSIX model exactly.
> 
> Yes, my comment was a little blase. I know that Windows has users & groups:
> 
> http://timgolden.me.uk/python/win32_how_do_i/get-the-owner-of-a-file.html
> 
> :)
> 
> I was thinking that you wanted a naive transfer of the Posix concept.
> The "owner" of a file does mean something to Windows (while the "group"
> really doesn't; it's just an artefact of Windows' posix-compatibility)
> but not as much as it does on Posix systems, because the security system
> is much more sophisticated.
> 
> But maybe I'm teaching my grandmother to suck eggs ?
> 
> TJG

Naw.  The intent is just to provide as similar as possible a user experience.
>From a coding POV, it is surely simpler to just use 'winuser' and 'wingroup',
but I am sort of philosophically wired to not throw information away if
it's a available from the OS.

BTW, wanna beta test a really cool CLI mass file renaming tool????? ;)

-- 
----------------------------------------------------------------------------
Tim Daneliuk     tundra at tundraware.com
PGP Key:         http://www.tundraware.com/PGP/



From pmaupin at gmail.com  Wed Mar 17 17:21:44 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Wed, 17 Mar 2010 14:21:44 -0700 (PDT)
Subject: to pass self or not to pass self
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org> 
	<4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com> 
	<mailman.925.1268855759.23598.python-list@python.org>
Message-ID: <b9e5729e-01f6-430d-8748-7cc7d115fc50@g19g2000yqe.googlegroups.com>

On Mar 17, 2:55?pm, Terry Reedy <tjre... at udel.edu> wrote:
> On 3/17/2010 1:35 AM, Patrick Maupin wrote:
>
> >>>> def a(s, count, lenfunc):
> > ... ? ? for i in xrange(count):
> > ... ? ? ? ?z = lenfunc(s)
> > ...
> >>>> >>> ?a('abcdef', 100000000, len)
> >>>> >>> ?a('abcdef', 100000000, str.__len__)
> > Running cPython 2.6 on my machine, len() runs about 3 times faster
> > than str.__len__(). ?The overhead of checking that an object is usable
> > with a particular class method far outweighs the cost of creating the
> > bound method!
>
> Wow, this so surprised me, that I had to try it with 3.1 (on winxp), and
> got a similar result (about 2.6x longer with str.__len__). This is a
> real lesson in measure, don't guess, and how premature 'optimization'
> may be a pessimization. Thanks.
>
> Terry Jan Reedy

Actually, I think I overstated my case -- there is some special logic
for len and built-in objects, I think.   I can see the same thing with
normal attributes on subclasses of object(), but not nearly as
dramatic.  In any case, your conclusion about this being a lesson in
"measure, don't guess" holds, with the additional caveat that, if it
matters, you need to somehow do some additional measurements to make
sure you are measuring what you think you are measuring!

Pat


From tundra at tundraware.com  Wed Mar 17 17:30:19 2010
From: tundra at tundraware.com (Tim Daneliuk)
Date: Wed, 17 Mar 2010 16:30:19 -0500
Subject: What Does sys.platform Return On 64 Bit Windows Systems?
Message-ID: <c7u777-j5p2.ln1@ozzie.tundraware.com>

On older 32 bit Windows systems, sys.platform returns:  'win32'

What does it return on 64-bit Windows systems?  I'd check myself, but
I don't have access to 64-bit Windows.

TIA,

-- 
----------------------------------------------------------------------------
Tim Daneliuk     tundra at tundraware.com
PGP Key:         http://www.tundraware.com/PGP/



From gagsl-py2 at yahoo.com.ar  Wed Mar 17 17:37:24 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 17 Mar 2010 18:37:24 -0300
Subject: bug in bdist_wininst cross compile?
References: <4BA0E958.8050205@chamonix.reportlab.co.uk>
Message-ID: <op.u9qecmi2x6zn5v@lepton.softlabbsas.com.ar>

En Wed, 17 Mar 2010 11:38:16 -0300, Robin Becker <robin at reportlab.com>  
escribi?:

> has anyone had any success with cross compilation and bdist_wininst; I  
> have modified build_ext very slightly to fix a small bug in cross  
> compilation related to library order.

Please post your bug report + patch at http://bugs.python.org or it will  
be lost.

-- 
Gabriel Genellina



From keirvt at gmail.com  Wed Mar 17 18:04:14 2010
From: keirvt at gmail.com (Keir Vaughan-taylor)
Date: Wed, 17 Mar 2010 15:04:14 -0700 (PDT)
Subject: os.walk restart
Message-ID: <a8c1c0df-cbfa-421c-a869-9f4c555a80ac@l11g2000pro.googlegroups.com>

I am traversing a large set of directories using

for root, dirs, files in os.walk(basedir):
    run program

Being a huge directory set the traversal is taking days to do a
traversal.
Sometimes it is the case there is a crash because of a programming
error.
As each directory is processed the name of the directory is written to
a file
I want to be able to restart the walk from the directory where it
crashed.

Is this possible?


From gatoygata2 at gmail.com  Wed Mar 17 18:34:53 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Wed, 17 Mar 2010 15:34:53 -0700 (PDT)
Subject: to pass self or not to pass self
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org> 
	<4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com> 
	<4ba09d09$0$21466$426a74cc@news.free.fr>
	<503dc9c5-e1ce-4b33-aff4-ee9677839fe0@33g2000yqj.googlegroups.com>
Message-ID: <c51f1be4-1a78-42cb-8335-3bf24e426238@upsg2000gro.googlegroups.com>

On Mar 17, 3:43?pm, Patrick Maupin <pmau... at gmail.com> wrote:
> On Mar 17, 4:12?am, Bruno Desthuilliers <bruno.
>
> 42.desthuilli... at websiteburo.invalid> wrote:
> > Patrick Maupin a ?crit :
>
> > > On Mar 16, 1:59 pm, Jason Tackaberry <t... at urandom.ca> wrote:
> > >> Why not create the bound methods at instantiation time, rather than
> > >> using the descriptor protocol which has the overhead of creating a new
> > >> bound method each time the method attribute is accessed?
>
> > > Well, for one thing, Python classes are open. ?They can be added to at
> > > any time. ?For another thing, you might not ever use most of the
> > > methods of an instance, so it would be a huge waste to create those.
>
> > A possible optimization would be a simple memoization on first access.
>
> I do agree that memoization on access is a good pattern, and I use it
> frequently. ?I don't know if I would want the interpreter
> automagically doing that for everything, though -- it would require
> some thought to figure out what the overhead cost is for the things
> that are only used once.
>
> Usually, I will have a slight naming difference for the things I want
> memoized, to get the memoization code to run. ?For example, if you add
> an underbar in front of everything you want memoized:
>
> class foo(object):
>
> ? ? def _bar(self):
> ? ? ? ? pass
>
> ? ? def __getattr__(self, aname):
> ? ? ? ? if aname.startswith('_'):
> ? ? ? ? ? ? raise AttributeError
> ? ? ? ? value = getattr(self, '_' + aname)
> ? ? ? ? self.aname = value
> ? ? ? ? return value
>
> obj = foo()
>
> So then the first time you look up obj.bar, it builds the bound
> method, and on subsequent accesses it just returns the previously
> bound method.
>
> Regards,
> Pat

Patrick, I was trying to understand the way your code was working but
I thing I'm not getting it.

I tested:

from time import time

class foo1(object):
    def _bar(self):
	pass
    def __getattr__(self, name):
	value = getattr(self, '_' + name)
	self.name = value
	return value

class foo2(object):
    def bar(self):
	pass

def a(klass, count):
    ins = klass()
    for i in xrange(count):
        z = ins.bar()

t0 = time()
a(foo1,  10000000)
t1 = time()
a(foo2, 10000000)
t2 = time()

print t1-t0   #75 sec
print t2-t1   #11 sec

foo1 is a lot slower than foo2. I understood that memoization should
optimize atribute calls. Maybe I am putting my foot in my mouth...

Thanks
JA


From googler.1.webmaster at spamgourmet.com  Wed Mar 17 18:35:06 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Wed, 17 Mar 2010 15:35:06 -0700 (PDT)
Subject: C-API PyObject_Call
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
	<mailman.849.1268756405.23598.python-list@python.org>
	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>
	<mailman.858.1268759662.23598.python-list@python.org>
	<c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>
	<mailman.883.1268808393.23598.python-list@python.org>
Message-ID: <3592cca0-2a4a-4a19-9e10-d80936e6d200@upsg2000gro.googlegroups.com>

> 1) put the line number information into the message string when you raise
> the exception


you mean the line and file information of the C code, right?


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 17 18:38:21 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 17 Mar 2010 22:38:21 GMT
Subject: Swapping Content of Two Dictionaries.
References: <779ea7fb1003160146t6fe79d6erc6dc12ea7452f6b3@mail.gmail.com>
	<779ea7fb1003170426o3dff6f06lade4b90c6a81f265@mail.gmail.com>
	<mailman.902.1268829286.23598.python-list@python.org>
Message-ID: <pan.2010.03.17.22.38.21@REMOVE.THIS.cybersource.com.au>

On Wed, 17 Mar 2010 13:34:51 +0100, Peter Otten wrote:

> Hatem Oraby wrote:
> 
>> Hello, I want to swap the content of two dictionaries, the obvious way
>> to do it is:
>> a = {1:"I'am A"}
>> b = {2:"I'm B"}
>> temp = a
>> a = b
>> b = temp
> 
> That can be simplified to
> 
> a, b = b, a
> 
> and is almost certainly the right approach.


Unfortunately, it may not, because it doesn't swap the content of two 
dictionaries (as asked for), but instead swaps the dictionaries bound to 
two names, which is a very different kettle of fish indeed.

It may be that the OP's description of his problem is inaccurate, in 
which case a simple re-binding is the easiest way, but if the subject 
line is accurate, then he needs your suggested solution using a temporary 
dict, clear and update. Wrap it in a function, and you have a one-liner 
swap operation :)



-- 
Steven


From gagsl-py2 at yahoo.com.ar  Wed Mar 17 18:39:45 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 17 Mar 2010 19:39:45 -0300
Subject: How to access a web site with an authentication template.
References: <4BA122B4.5030003@bluewin.ch>
Message-ID: <op.u9qg8jr6x6zn5v@lepton.softlabbsas.com.ar>

En Wed, 17 Mar 2010 15:43:00 -0300, Anthra Norell  
<anthra.norell at bluewin.ch> escribi?:

> I understand that I can access password protected sites with urllib2. 
> [...] a site I am dealing with, because the opening page does not  
> require a password. It presents an id/password entry template and I have  
> no clue how to respond in python. The page source is chock full of java  
> script.

Use an HTTP sniffer (there are plenty) to see the actual request that is  
sent to the server. Then emulate it using urllib2.

-- 
Gabriel Genellina



From david at boddie.org.uk  Wed Mar 17 18:40:43 2010
From: david at boddie.org.uk (David Boddie)
Date: Wed, 17 Mar 2010 23:40:43 +0100
Subject: highlight words by regex in pdf files using python
References: <af0830ae-1d24-4db9-b721-d6602fedd540@15g2000yqi.googlegroups.com>
	<hnp5at$eig$1@panix5.panix.com>
Message-ID: <hnrlpb$75g$1@get-news01.get.basefarm.net>

On Wednesday 17 March 2010 00:47, Aahz wrote:

> In article
> <af0830ae-1d24-4db9-b721-d6602fedd540 at 15g2000yqi.googlegroups.com>,
> Peng Yu  <pengyu.ut at gmail.com> wrote:
>>
>>I don't find a general pdf library in python that can do any
>>operations on pdfs.
>>
>>I want to automatically highlight certain words (using regex) in a
>>pdf. Could somebody let me know if there is a tool to do so in python?
> 
> Did you Google at all?  "python pdf" finds this as the first link, though
> I have no clue whether it does what you want:
> 
> http://pybrary.net/pyPdf/

The original poster might also be interested in displaying the highlighted
words without modifying the original file. In which case, the Poppler
library is worth investigating:

  http://poppler.freedesktop.org/

David


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 17 18:42:35 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 17 Mar 2010 22:42:35 GMT
Subject: os.walk restart
References: <a8c1c0df-cbfa-421c-a869-9f4c555a80ac@l11g2000pro.googlegroups.com>
Message-ID: <pan.2010.03.17.22.42.34@REMOVE.THIS.cybersource.com.au>

On Wed, 17 Mar 2010 15:04:14 -0700, Keir Vaughan-taylor wrote:

> I am traversing a large set of directories using
> 
> for root, dirs, files in os.walk(basedir):
>     run program
> 
> Being a huge directory set the traversal is taking days to do a
> traversal.
> Sometimes it is the case there is a crash because of a programming
> error.
> As each directory is processed the name of the directory is written to a
> file

What, a proper, honest-to-goodness core dump?

Or do you mean an exception?


> I want to be able to restart the walk from the directory where it
> crashed.
> 
> Is this possible?


Quick and dirty with no error-checking:


# Untested
last_visited = open("last_visited.txt", 'r').read()
for root, dirs, files in os.walk(last_visited or basedir):
     open("last_visited.txt", 'w').write(root)
     run program




-- 
Steven


From news1234 at free.fr  Wed Mar 17 18:47:41 2010
From: news1234 at free.fr (News123)
Date: Wed, 17 Mar 2010 23:47:41 +0100
Subject: url2lib (windows 7) does not notice when network reconnects
	(getaddrinfo problem)
Message-ID: <4ba15c0d$0$15456$426a74cc@news.free.fr>

Hi,


I'd like to write a function, that knows when the 'internet' is reachable.

My setup is a windows7 host with a wireless USB modem. The modem might
connect / disconnect any time.

I thought I write a small function just checking whether I can fetch a url.
######### script starts
import time,urllib2

myurl = "http://www.mysite.com" # or "www.google.com" or whatever you like

while True:
    connected = False
    try:
        urllib2.urlopen(myurl)
        connected = True
    except urllib2.URLError as e:
        print "urlerr %s" % e
    print "connected",connected
    time.sleep(1)
########## end of script

if the network is connected when I start the script the first time after
reboot, then  I receive
> connected True
As expected

If the network is disconnected when I start the script the first time
after reboot, then  I receive
> urlerr <urlopen error [Errno 11004] getaddrinfo failed>
> connected False
as expected

Things are getting weired, when my USB wireless modem connects after
I started my script:

It happens, that I just continue to receive:
> urlerr <urlopen error [Errno 11004] getaddrinfo failed>
> connected False

however when I use a windows cmd window and I start
"ping www.mysite.com", then my python script recovers and reports
> connected True

My perhaps false conclusion is, that getaddrinfo() is not retrying to
resolve an IP address, when it failed once.

Is this behaviour known? Can this really be possible?
I can reproduce this issue. not every time, but rather often.

If yes, is there any way to force a new host name lookup under windows?


What else could I be doing wrong?


Thanks a lot in advance for any ideas


N
















	


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 17 18:49:20 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 17 Mar 2010 22:49:20 GMT
Subject: What Does sys.platform Return On 64 Bit Windows Systems?
References: <c7u777-j5p2.ln1@ozzie.tundraware.com>
Message-ID: <pan.2010.03.17.22.49.18@REMOVE.THIS.cybersource.com.au>

On Wed, 17 Mar 2010 16:30:19 -0500, Tim Daneliuk wrote:

> On older 32 bit Windows systems, sys.platform returns:  'win32'
> 
> What does it return on 64-bit Windows systems?  I'd check myself, but I
> don't have access to 64-bit Windows.

According to the docs, it returns win32:

http://docs.python.org/library/sys.html

If anyone knows different, this should be reported as a documentation 
bug. But 30 seconds of googling suggests that sys.platform is 'win32' 
even on 64-bit builds of Windows, by design:

http://stackoverflow.com/questions/2144748/is-it-safe-to-use-sys-platformwin32-check-on-64-bit-python



-- 
Steven


From gagsl-py2 at yahoo.com.ar  Wed Mar 17 19:09:28 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 17 Mar 2010 20:09:28 -0300
Subject: os.walk restart
References: <a8c1c0df-cbfa-421c-a869-9f4c555a80ac@l11g2000pro.googlegroups.com>
Message-ID: <op.u9qil2i0x6zn5v@lepton.softlabbsas.com.ar>

En Wed, 17 Mar 2010 19:04:14 -0300, Keir Vaughan-taylor <keirvt at gmail.com>  
escribi?:

> I am traversing a large set of directories using
>
> for root, dirs, files in os.walk(basedir):
>     run program
>
> Being a huge directory set the traversal is taking days to do a
> traversal.
> Sometimes it is the case there is a crash because of a programming
> error.
> As each directory is processed the name of the directory is written to
> a file
> I want to be able to restart the walk from the directory where it
> crashed.
>
> Is this possible?

If the 'dirs' list were guaranteed to be sorted, you could remove at each  
level all previous directories already traversed. But it's not :(

Perhaps a better approach would be, once, collect all directories to be  
processed and write them on a text file -- these are the pending  
directories. Then, read from the pending file and process every directory  
in it. If the process aborts for any reason, manually delete the lines  
already processed and restart.

If you use a database instead of a text file, and mark entries as "done"  
after processing, you can avoid that last manual step and the whole  
process may be kept running automatically. In some cases you may want to  
choose the starting point at random.

-- 
Gabriel Genellina



From pmaupin at gmail.com  Wed Mar 17 19:11:42 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Wed, 17 Mar 2010 16:11:42 -0700 (PDT)
Subject: to pass self or not to pass self
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org> 
	<4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com> 
	<4ba09d09$0$21466$426a74cc@news.free.fr>
	<503dc9c5-e1ce-4b33-aff4-ee9677839fe0@33g2000yqj.googlegroups.com>
	<c51f1be4-1a78-42cb-8335-3bf24e426238@upsg2000gro.googlegroups.com>
Message-ID: <0314849c-f748-4989-ae91-4dd42c95c251@q21g2000yqm.googlegroups.com>

On Mar 17, 5:34?pm, Joaquin Abian <gatoyga... at gmail.com> wrote:
> On Mar 17, 3:43?pm, Patrick Maupin <pmau... at gmail.com> wrote:
>
>
>
> > On Mar 17, 4:12?am, Bruno Desthuilliers <bruno.
>
> > 42.desthuilli... at websiteburo.invalid> wrote:
> > > Patrick Maupin a ?crit :
>
> > > > On Mar 16, 1:59 pm, Jason Tackaberry <t... at urandom.ca> wrote:
> > > >> Why not create the bound methods at instantiation time, rather than
> > > >> using the descriptor protocol which has the overhead of creating a new
> > > >> bound method each time the method attribute is accessed?
>
> > > > Well, for one thing, Python classes are open. ?They can be added to at
> > > > any time. ?For another thing, you might not ever use most of the
> > > > methods of an instance, so it would be a huge waste to create those.
>
> > > A possible optimization would be a simple memoization on first access.
>
> > I do agree that memoization on access is a good pattern, and I use it
> > frequently. ?I don't know if I would want the interpreter
> > automagically doing that for everything, though -- it would require
> > some thought to figure out what the overhead cost is for the things
> > that are only used once.
>
> > Usually, I will have a slight naming difference for the things I want
> > memoized, to get the memoization code to run. ?For example, if you add
> > an underbar in front of everything you want memoized:
>
> > class foo(object):
>
> > ? ? def _bar(self):
> > ? ? ? ? pass
>
> > ? ? def __getattr__(self, aname):
> > ? ? ? ? if aname.startswith('_'):
> > ? ? ? ? ? ? raise AttributeError
> > ? ? ? ? value = getattr(self, '_' + aname)
> > ? ? ? ? self.aname = value
> > ? ? ? ? return value
>
> > obj = foo()
>
> > So then the first time you look up obj.bar, it builds the bound
> > method, and on subsequent accesses it just returns the previously
> > bound method.
>
> > Regards,
> > Pat
>
> Patrick, I was trying to understand the way your code was working but
> I thing I'm not getting it.
>
> I tested:
>
> from time import time
>
> class foo1(object):
> ? ? def _bar(self):
> ? ? ? ? pass
> ? ? def __getattr__(self, name):
> ? ? ? ? value = getattr(self, '_' + name)
> ? ? ? ? self.name = value
> ? ? ? ? return value
>
> class foo2(object):
> ? ? def bar(self):
> ? ? ? ? pass
>
> def a(klass, count):
> ? ? ins = klass()
> ? ? for i in xrange(count):
> ? ? ? ? z = ins.bar()
>
> t0 = time()
> a(foo1, ?10000000)
> t1 = time()
> a(foo2, 10000000)
> t2 = time()
>
> print t1-t0 ? #75 sec
> print t2-t1 ? #11 sec
>
> foo1 is a lot slower than foo2. I understood that memoization should
> optimize atribute calls. Maybe I am putting my foot in my mouth...
>
> Thanks
> JA

I don't think you are putting your foot in your mouth.  I always have
to test to remember what works faster and what doesn't.  Usually when
I memoize as I showed, it is not a simple attribute lookup, but
something that takes more work to create.  As I stated in my response
to Terry, I overstated my case earlier, because of some optimizations
in len(), I think.  Nonetheless, (at least on Python 2.6) I think the
advice I gave to the OP holds.  One difference is that you are doing
an attribute lookup in your inner loop.  I do find that performance
hit surprising, but to compare with what the OP is describing, you
either need to look up an unbound function in a dict and call it with
a parameter, or look up a bound method in a dict and call it without
the parameter.  Since the dict lookup doesn't usually do anything
fancy and unexpected like attribute lookup, we pull the dict lookup
out of the equation and out of the inner loop, and just do the
comparison like this:

>>> class foo(object):
...     def bar(self):
...         pass
...
>>> x = foo()
>>>
>>> def a(func, count):
...     for i in xrange(count):
...         z=func()
...
>>> def b(func, param, count):
...     for i in xrange(count):
...         z=func(param)
...
>>>
>>> a(x.bar,      100000000)  # 13 seconds
>>> b(foo.bar, x, 100000000)  # 18 seconds

Regards,
Pat


From lists at cheimes.de  Wed Mar 17 19:16:55 2010
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 18 Mar 2010 00:16:55 +0100
Subject: What Does sys.platform Return On 64 Bit Windows Systems?
In-Reply-To: <c7u777-j5p2.ln1@ozzie.tundraware.com>
References: <c7u777-j5p2.ln1@ozzie.tundraware.com>
Message-ID: <4BA162E7.7000503@cheimes.de>

Tim Daneliuk schrieb:
> On older 32 bit Windows systems, sys.platform returns:  'win32'
> 
> What does it return on 64-bit Windows systems?  I'd check myself, but
> I don't have access to 64-bit Windows.

Do you want to know if the current build of Python is a 32 or 64bit build?

>>> import struct
>>> struct.calcsize("P") * 8
64

Christian


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 17 20:12:14 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 18 Mar 2010 00:12:14 GMT
Subject: class inheritance
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
	<9bb4c1e7-858e-4ee6-870b-5a6549b6c496@b36g2000pri.googlegroups.com>
	<05d0d40f-3fa0-4095-875d-777b49122d12@l12g2000prg.googlegroups.com>
Message-ID: <pan.2010.03.18.00.12.14@REMOVE.THIS.cybersource.com.au>

On Mon, 15 Mar 2010 16:34:35 -0700, JLundell wrote:

> It's also unfortunate that Python doesn't have an approximately-equal
> operator; it'd come in handy for floating-point applications while
> preserving hash. If only there were a ~= or ? operator I could overload.
> And ~ is unary, so no joy.

Not everything needs to be a built-in, or an operator. This might be 
useful for you:

http://code.activestate.com/recipes/577124-approximately-equal/


Feedback welcome.


-- 
Steven


From gatoygata2 at gmail.com  Wed Mar 17 20:55:41 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Wed, 17 Mar 2010 17:55:41 -0700 (PDT)
Subject: to pass self or not to pass self
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org> 
	<4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com> 
	<4ba09d09$0$21466$426a74cc@news.free.fr>
	<503dc9c5-e1ce-4b33-aff4-ee9677839fe0@33g2000yqj.googlegroups.com>
	<c51f1be4-1a78-42cb-8335-3bf24e426238@upsg2000gro.googlegroups.com> 
	<0314849c-f748-4989-ae91-4dd42c95c251@q21g2000yqm.googlegroups.com>
Message-ID: <bedfdbe1-2644-4716-9d39-974ab1e1e8b5@r1g2000yqj.googlegroups.com>

On Mar 18, 12:11?am, Patrick Maupin <pmau... at gmail.com> wrote:
> On Mar 17, 5:34?pm, Joaquin Abian <gatoyga... at gmail.com> wrote:
>
>
>
> > On Mar 17, 3:43?pm, Patrick Maupin <pmau... at gmail.com> wrote:
>
> > > On Mar 17, 4:12?am, Bruno Desthuilliers <bruno.
>
> > > 42.desthuilli... at websiteburo.invalid> wrote:
> > > > Patrick Maupin a ?crit :
>
> > > > > On Mar 16, 1:59 pm, Jason Tackaberry <t... at urandom.ca> wrote:
> > > > >> Why not create the bound methods at instantiation time, rather than
> > > > >> using the descriptor protocol which has the overhead of creating a new
> > > > >> bound method each time the method attribute is accessed?
>
> > > > > Well, for one thing, Python classes are open. ?They can be added to at
> > > > > any time. ?For another thing, you might not ever use most of the
> > > > > methods of an instance, so it would be a huge waste to create those.
>
> > > > A possible optimization would be a simple memoization on first access.
>
> > > I do agree that memoization on access is a good pattern, and I use it
> > > frequently. ?I don't know if I would want the interpreter
> > > automagically doing that for everything, though -- it would require
> > > some thought to figure out what the overhead cost is for the things
> > > that are only used once.
>
> > > Usually, I will have a slight naming difference for the things I want
> > > memoized, to get the memoization code to run. ?For example, if you add
> > > an underbar in front of everything you want memoized:
>
> > > class foo(object):
>
> > > ? ? def _bar(self):
> > > ? ? ? ? pass
>
> > > ? ? def __getattr__(self, aname):
> > > ? ? ? ? if aname.startswith('_'):
> > > ? ? ? ? ? ? raise AttributeError
> > > ? ? ? ? value = getattr(self, '_' + aname)
> > > ? ? ? ? self.aname = value
> > > ? ? ? ? return value
>
> > > obj = foo()
>
> > > So then the first time you look up obj.bar, it builds the bound
> > > method, and on subsequent accesses it just returns the previously
> > > bound method.
>
> > > Regards,
> > > Pat
>
> > Patrick, I was trying to understand the way your code was working but
> > I thing I'm not getting it.
>
> > I tested:
>
> > from time import time
>
> > class foo1(object):
> > ? ? def _bar(self):
> > ? ? ? ? pass
> > ? ? def __getattr__(self, name):
> > ? ? ? ? value = getattr(self, '_' + name)
> > ? ? ? ? self.name = value
> > ? ? ? ? return value
>
> > class foo2(object):
> > ? ? def bar(self):
> > ? ? ? ? pass
>
> > def a(klass, count):
> > ? ? ins = klass()
> > ? ? for i in xrange(count):
> > ? ? ? ? z = ins.bar()
>
> > t0 = time()
> > a(foo1, ?10000000)
> > t1 = time()
> > a(foo2, 10000000)
> > t2 = time()
>
> > print t1-t0 ? #75 sec
> > print t2-t1 ? #11 sec
>
> > foo1 is a lot slower than foo2. I understood that memoization should
> > optimize atribute calls. Maybe I am putting my foot in my mouth...
>
> > Thanks
> > JA
>
> I don't think you are putting your foot in your mouth. ?I always have
> to test to remember what works faster and what doesn't. ?Usually when
> I memoize as I showed, it is not a simple attribute lookup, but
> something that takes more work to create. ?As I stated in my response
> to Terry, I overstated my case earlier, because of some optimizations
> in len(), I think. ?Nonetheless, (at least on Python 2.6) I think the
> advice I gave to the OP holds. ?One difference is that you are doing
> an attribute lookup in your inner loop. ?I do find that performance
> hit surprising, but to compare with what the OP is describing, you
> either need to look up an unbound function in a dict and call it with
> a parameter, or look up a bound method in a dict and call it without
> the parameter. ?Since the dict lookup doesn't usually do anything
> fancy and unexpected like attribute lookup, we pull the dict lookup
> out of the equation and out of the inner loop, and just do the
> comparison like this:
>
> >>> class foo(object):
>
> ... ? ? def bar(self):
> ... ? ? ? ? pass
> ...>>> x = foo()
>
> >>> def a(func, count):
>
> ... ? ? for i in xrange(count):
> ... ? ? ? ? z=func()
> ...>>> def b(func, param, count):
>
> ... ? ? for i in xrange(count):
> ... ? ? ? ? z=func(param)
> ...
>
>
>
> >>> a(x.bar, ? ? ?100000000) ?# 13 seconds
> >>> b(foo.bar, x, 100000000) ?# 18 seconds
>
> Regards,
> Pat

OK, Thanks. Need to play a little bit with it.
Cheers
JA


From python at bdurham.com  Wed Mar 17 22:42:46 2010
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 17 Mar 2010 22:42:46 -0400
Subject: Possible to open a file for shared write mode under Windows?
Message-ID: <1268880166.3322.1365412149@webmail.messagingengine.com>

Is there a way to open a file for shared write mode under
Windows?

I have 2 processes that will write to different regions of this
shared file.

Thank you,
Malcolm
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From wuwei23 at gmail.com  Wed Mar 17 23:08:48 2010
From: wuwei23 at gmail.com (alex23)
Date: Wed, 17 Mar 2010 20:08:48 -0700 (PDT)
Subject: os.walk restart
References: <a8c1c0df-cbfa-421c-a869-9f4c555a80ac@l11g2000pro.googlegroups.com>
	<pan.2010.03.17.22.42.34@REMOVE.THIS.cybersource.com.au>
Message-ID: <92b42203-876f-4383-9af6-b0ed775c3d92@w9g2000prb.googlegroups.com>

Steven D'Aprano <ste... at REMOVE.THIS.cybersource.com.au> wrote:
> # Untested
> last_visited = open("last_visited.txt", 'r').read()
> for root, dirs, files in os.walk(last_visited or basedir):
> ? ? ?open("last_visited.txt", 'w').write(root)
> ? ? ?run program

Wouldn't this only walk the directory the exception occured in and not
the remaining unwalked dirs from basedir?

Something like this should work:

import os
basedir = '.'

walked = open('walked.txt','r').read().split()
unwalked = ((r,d,f) for r,d,f in os.walk(basedir) if r not in walked)

for root, dirs, files in unwalked:
  # do something
  print root
  walked.append(root)

open('walked.txt','w').write('\n'.join(walked))


From python at mrabarnett.plus.com  Wed Mar 17 23:34:46 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 18 Mar 2010 03:34:46 +0000
Subject: os.walk restart
In-Reply-To: <a8c1c0df-cbfa-421c-a869-9f4c555a80ac@l11g2000pro.googlegroups.com>
References: <a8c1c0df-cbfa-421c-a869-9f4c555a80ac@l11g2000pro.googlegroups.com>
Message-ID: <4BA19F56.4020302@mrabarnett.plus.com>

Keir Vaughan-taylor wrote:
> I am traversing a large set of directories using
> 
> for root, dirs, files in os.walk(basedir):
>     run program
> 
> Being a huge directory set the traversal is taking days to do a
> traversal.
> Sometimes it is the case there is a crash because of a programming
> error.
> As each directory is processed the name of the directory is written to
> a file
> I want to be able to restart the walk from the directory where it
> crashed.
> 
> Is this possible?

I would write my own walker which sorts the directory entries it finds
before walking them and can skip the entries until it gets to the
desired starting path, eg if I want to start at "/foo/bar" then skip
over the entries in the root directory which start with a name before
"foo" and the entries in the subdirectory "/foo" which start with a name
before "bar".


From showell30 at yahoo.com  Wed Mar 17 23:49:58 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Wed, 17 Mar 2010 20:49:58 -0700 (PDT)
Subject: os.walk restart
References: <a8c1c0df-cbfa-421c-a869-9f4c555a80ac@l11g2000pro.googlegroups.com>
Message-ID: <68cbed3c-87f6-45c9-ac8e-a536cae20f26@k6g2000prg.googlegroups.com>

On Mar 17, 3:04?pm, Keir Vaughan-taylor <kei... at gmail.com> wrote:
> I am traversing a large set of directories using
>
> for root, dirs, files in os.walk(basedir):
> ? ? run program
>
> Being a huge directory set the traversal is taking days to do a
> traversal.
> Sometimes it is the case there is a crash because of a programming
> error.
> As each directory is processed the name of the directory is written to
> a file
> I want to be able to restart the walk from the directory where it
> crashed.
>
> Is this possible?

I assume it's the operation that you are doing on each file that is
expensive, not the walk itself.

If that's the case, then you might be able to get away with just
leaving some kind of breadcrumbs whenever you've successfully
processed a directory or a file, so you can quickly short-circuit
entire directories or files on the next run, without having to
implement any kind of complicated start-where-I-left-off before
algorithm.

The breadcrumbs could be hidden files in the file system, or an easy-
indexable list of files that you persist, etc.

What are you doing that takes so long?

Also, I can understand why the operations on the files themselves
might crash, but can't you catch an exception and keep on chugging?

Another option, if you do not do some kind of pruning on the fly, is
to persist the list of files that you need to process up front to a
file, or a database, and persist the index of the last successfully
processed file, so that you can restart as needed from where you left
off.


From steven at REMOVE.THIS.cybersource.com.au  Thu Mar 18 00:04:46 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 18 Mar 2010 04:04:46 GMT
Subject: os.walk restart
References: <a8c1c0df-cbfa-421c-a869-9f4c555a80ac@l11g2000pro.googlegroups.com>
	<pan.2010.03.17.22.42.34@REMOVE.THIS.cybersource.com.au>
	<92b42203-876f-4383-9af6-b0ed775c3d92@w9g2000prb.googlegroups.com>
Message-ID: <pan.2010.03.18.04.04.46@REMOVE.THIS.cybersource.com.au>

On Wed, 17 Mar 2010 20:08:48 -0700, alex23 wrote:

> Steven D'Aprano <ste... at REMOVE.THIS.cybersource.com.au> wrote:
>> # Untested
>> last_visited = open("last_visited.txt", 'r').read()
>> for root, dirs, files in os.walk(last_visited or basedir):
>> ? ? ?open("last_visited.txt", 'w').write(root) run program
> 
> Wouldn't this only walk the directory the exception occured in and not
> the remaining unwalked dirs from basedir?

Only if you have some sort of branching file hierarchy with multiple sub-
directories in the one directory, instead of a nice simple linear chain 
of directories a/b/c/d/.../z as nature intended.

*wink*

Yes, good catch. I said it was untested. You might be able to save the 
parent of the current directory, and restart from there instead.


-- 
Steven


From gagsl-py2 at yahoo.com.ar  Thu Mar 18 00:20:31 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 18 Mar 2010 01:20:31 -0300
Subject: Possible to open a file for shared write mode under Windows?
References: <1268880166.3322.1365412149@webmail.messagingengine.com>
Message-ID: <op.u9qw0h1ex6zn5v@lepton.softlabbsas.com.ar>

En Wed, 17 Mar 2010 23:42:46 -0300, <python at bdurham.com> escribi?:

> Is there a way to open a file for shared write mode under
> Windows?
>
> I have 2 processes that will write to different regions of this
> shared file.

Using the pywin32 package at sourceforge, you have access to the  
CreateFile function:  
http://msdn.microsoft.com/en-us/library/aa363858(v=VS.85).aspx
You want dwShareMode=FILE_SHARE_WRITE

-- 
Gabriel Genellina



From sccolbert at gmail.com  Thu Mar 18 00:38:56 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Thu, 18 Mar 2010 00:38:56 -0400
Subject: Possible to open a file for shared write mode under Windows?
In-Reply-To: <op.u9qw0h1ex6zn5v@lepton.softlabbsas.com.ar>
References: <1268880166.3322.1365412149@webmail.messagingengine.com>
	<op.u9qw0h1ex6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <7f014ea61003172138x6482aa87v50c865cb4e51eba5@mail.gmail.com>

you could also just have one process do the writing for both processes via
pipes.

On Thu, Mar 18, 2010 at 12:20 AM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar>wrote:

> En Wed, 17 Mar 2010 23:42:46 -0300, <python at bdurham.com> escribi?:
>
>
>  Is there a way to open a file for shared write mode under
>> Windows?
>>
>> I have 2 processes that will write to different regions of this
>> shared file.
>>
>
> Using the pywin32 package at sourceforge, you have access to the CreateFile
> function: http://msdn.microsoft.com/en-us/library/aa363858(v=VS.85).aspx
> You want dwShareMode=FILE_SHARE_WRITE
>
> --
> Gabriel Genellina
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From steve at holdenweb.com  Thu Mar 18 00:52:28 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 18 Mar 2010 00:52:28 -0400
Subject: Possible to open a file for shared write mode under Windows?
In-Reply-To: <7f014ea61003172138x6482aa87v50c865cb4e51eba5@mail.gmail.com>
References: <1268880166.3322.1365412149@webmail.messagingengine.com>	<op.u9qw0h1ex6zn5v@lepton.softlabbsas.com.ar>
	<7f014ea61003172138x6482aa87v50c865cb4e51eba5@mail.gmail.com>
Message-ID: <hnsbin$5ak$1@dough.gmane.org>

Chris Colbert wrote:
[top-posting switched to bottom-posting]
> 
> On Thu, Mar 18, 2010 at 12:20 AM, Gabriel Genellina
> <gagsl-py2 at yahoo.com.ar <mailto:gagsl-py2 at yahoo.com.ar>> wrote:
> 
>     En Wed, 17 Mar 2010 23:42:46 -0300, <python at bdurham.com
>     <mailto:python at bdurham.com>> escribi?:
> 
> 
>         Is there a way to open a file for shared write mode under
>         Windows?
> 
>         I have 2 processes that will write to different regions of this
>         shared file.
> 
> 
>     Using the pywin32 package at sourceforge, you have access to the
>     CreateFile function:
>     http://msdn.microsoft.com/en-us/library/aa363858(v=VS.85).aspx
>     You want dwShareMode=FILE_SHARE_WRITE
> 
> you could also just have one process do the writing for both processes
> via pipes.

You could, but then you'd have to work out how to avoid blocking on one
pipe when data was available form the other. Or is this trivially easy,
and I just don't know enough about pipes?

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From python at bdurham.com  Thu Mar 18 01:15:50 2010
From: python at bdurham.com (python at bdurham.com)
Date: Thu, 18 Mar 2010 01:15:50 -0400
Subject: Possible to open a file for shared write mode under Windows?
In-Reply-To: <op.u9qw0h1ex6zn5v@lepton.softlabbsas.com.ar>
References: <1268880166.3322.1365412149@webmail.messagingengine.com>
	<op.u9qw0h1ex6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <1268889350.21982.1365426663@webmail.messagingengine.com>

Hi Gabriel,

> Using the pywin32 package at sourceforge, you have access to the CreateFile function:  
> http://msdn.microsoft.com/en-us/library/aa363858(v=VS.85).aspx
> You want dwShareMode=FILE_SHARE_WRITE

Thanks - that was exactly what I was looking for.

Regards,
Malcolm


From sccolbert at gmail.com  Thu Mar 18 01:31:33 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Thu, 18 Mar 2010 01:31:33 -0400
Subject: Possible to open a file for shared write mode under Windows?
In-Reply-To: <hnsbin$5ak$1@dough.gmane.org>
References: <1268880166.3322.1365412149@webmail.messagingengine.com>
	<op.u9qw0h1ex6zn5v@lepton.softlabbsas.com.ar>
	<7f014ea61003172138x6482aa87v50c865cb4e51eba5@mail.gmail.com>
	<hnsbin$5ak$1@dough.gmane.org>
Message-ID: <7f014ea61003172231m60ec154rda99c31c06d82eb6@mail.gmail.com>

It's not too difficult:

# subp.py

import sys
import time

for i in range(10):
    sys.stdout.write('I am subprocess\n')
    sys.stdout.flush()  # this may not be necessary
    time.sleep(1)

# writer.py

import subprocess
import time

subp = subprocess.Popen(['/usr/bin/python', '-u', './subp.py'],
stdout=subprocess.PIPE)

while True:
    time.sleep(1)
    print('I am main process.') # write this to one section of the file

    if subp.poll() != None: # the subprocess has terminated
        break

    stdout = subp.stdout.readline()
    print(stdout) # write this to the other section



brucewayne at broo:~/Documents$ python ./writer.py
I am main process.
I am subprocess

I am main process.
I am subprocess

I am main process.
I am subprocess

I am main process.
I am subprocess

I am main process.
I am subprocess

I am main process.
I am subprocess

I am main process.
I am subprocess

I am main process.
I am subprocess

I am main process.
I am subprocess

I am main process.
I am subprocess

I am main process.



On Thu, Mar 18, 2010 at 12:52 AM, Steve Holden <steve at holdenweb.com> wrote:

> Chris Colbert wrote:
> [top-posting switched to bottom-posting]
> >
> > On Thu, Mar 18, 2010 at 12:20 AM, Gabriel Genellina
> > <gagsl-py2 at yahoo.com.ar <mailto:gagsl-py2 at yahoo.com.ar>> wrote:
> >
> >     En Wed, 17 Mar 2010 23:42:46 -0300, <python at bdurham.com
> >     <mailto:python at bdurham.com>> escribi?:
> >
> >
> >         Is there a way to open a file for shared write mode under
> >         Windows?
> >
> >         I have 2 processes that will write to different regions of this
> >         shared file.
> >
> >
> >     Using the pywin32 package at sourceforge, you have access to the
> >     CreateFile function:
> >     http://msdn.microsoft.com/en-us/library/aa363858(v=VS.85).aspx
> >     You want dwShareMode=FILE_SHARE_WRITE
> >
> > you could also just have one process do the writing for both processes
> > via pipes.
>
> You could, but then you'd have to work out how to avoid blocking on one
> pipe when data was available form the other. Or is this trivially easy,
> and I just don't know enough about pipes?
>
> regards
>  Steve
> --
> Steve Holden           +1 571 484 6266   +1 800 494 3119
> See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
> Holden Web LLC                 http://www.holdenweb.com/
> UPCOMING EVENTS:        http://holdenweb.eventbrite.com/
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From steven at REMOVE.THIS.cybersource.com.au  Thu Mar 18 01:52:14 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 18 Mar 2010 05:52:14 GMT
Subject: Understanding the CPython dict implementation
References: <mailman.768.1268610003.23598.python-list@python.org>
	<4b9f6fab$0$27822$c3e8da3@news.astraweb.com>
	<mailman.866.1268769875.23598.python-list@python.org>
Message-ID: <pan.2010.03.18.05.52.10@REMOVE.THIS.cybersource.com.au>

On Tue, 16 Mar 2010 16:04:22 -0400, Terry Reedy wrote:

> On 3/16/2010 7:46 AM, Steven D'Aprano wrote:
>> On Sun, 14 Mar 2010 19:39:46 -0400, Terry Reedy wrote:
>>
>>> I found this PyCon2010 presentation to be excellent: The Mighty
>>> Dictionary, Branden Craig Rhodes, 30 min.
> 
> Sorry,
> http://pycon.blip.tv/file/3332763/
> 
> which plays fine in FF3.6 on windows
> 
> 
>>> http://pycon.blip.tv/file/3264041/
> 
> wrong file number
> 
>> Unfortunately, that clip seems to be unwatchable, at least for me. It
>> crashed the Netscape plugin in Konqueror, and crashed Firefox.
> 
> The flash version does not work for me. This is true of about 1/3 of the
> Pycon 2010 videos that I have tried. The .ogv version of this and all
> others that I have tried (hit Download under Comments) plays fine within
> FF3.6 on my windows xp machine. Perhaps there is a linux-specific bug,
> if that is what you are running under.

Amusingly, the FLV files play perfectly for me under Linux, while the OGV 
files don't :)

Thanks for the links, the videos are very interesting.



-- 
Steven


From zubin.mithra at gmail.com  Thu Mar 18 02:28:53 2010
From: zubin.mithra at gmail.com (Zubin Mithra)
Date: Thu, 18 Mar 2010 11:58:53 +0530
Subject: D-Bus
Message-ID: <8e7c74321003172328s2f22ae87v4c732ff3d33c094e@mail.gmail.com>

Hello,

I have experience writing scripts to connect to the D-Bus interface provided
by different applications but have no experience writing a D-Bus interface
for an application. Could someone point me in the right direction? A
tutorial or a good example would be nice.

Cheers!!!
Zubin Mithra

http://zubin71.wordpress.com
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From ldo at geek-central.gen.new_zealand  Thu Mar 18 03:49:55 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Thu, 18 Mar 2010 20:49:55 +1300
Subject: import antigravity
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
Message-ID: <hnslv3$jjk$2@lust.ihug.co.nz>

In message <mailman.820.1268725930.23598.python-list at python.org>, Chris 
Rebert wrote:

I see that you published my unobfuscated e-mail address on USENET for all to
see. I obfuscated it for a reason, to keep the spammers away. I'm assuming
this was a momentary lapse of judgement, for which I expect an apology.
Otherwise, it becomes grounds for an abuse complaint to your ISP. 


From stefan_ml at behnel.de  Thu Mar 18 04:13:05 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Thu, 18 Mar 2010 09:13:05 +0100
Subject: C-API PyObject_Call
In-Reply-To: <3592cca0-2a4a-4a19-9e10-d80936e6d200@upsg2000gro.googlegroups.com>
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>	<mailman.849.1268756405.23598.python-list@python.org>	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>	<mailman.858.1268759662.23598.python-list@python.org>	<c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>	<mailman.883.1268808393.23598.python-list@python.org>
	<3592cca0-2a4a-4a19-9e10-d80936e6d200@upsg2000gro.googlegroups.com>
Message-ID: <hnsnah$1gh$1@dough.gmane.org>

moerchendiser2k3, 17.03.2010 23:35:
>> 1) put the line number information into the message string when you raise
>> the exception
>
> you mean the line and file information of the C code, right?

Funny that you (being the OP) ask *me* what kind of line information *you* 
want.

Stefan



From stefan_ml at behnel.de  Thu Mar 18 04:17:43 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Thu, 18 Mar 2010 09:17:43 +0100
Subject: import antigravity
In-Reply-To: <hnslv3$jjk$2@lust.ihug.co.nz>
References: <hnnclk$eud$1@lust.ihug.co.nz>	<mailman.820.1268725930.23598.python-list@python.org>
	<hnslv3$jjk$2@lust.ihug.co.nz>
Message-ID: <hnsnj7$2pj$1@dough.gmane.org>

Lawrence D'Oliveiro, 18.03.2010 08:49:
> In message<mailman.820.1268725930.23598.python-list at python.org>, Chris
> Rebert wrote:
>
> I see that you published my unobfuscated e-mail address on USENET for all to
> see. I obfuscated it for a reason, to keep the spammers away. I'm assuming
> this was a momentary lapse of judgement, for which I expect an apology.
> Otherwise, it becomes grounds for an abuse complaint to your ISP.

I hope you just had a bad day. Threatening others for figuring out your 
e-mail address is even worse than posting with an illegal e-mail address.

Stefan



From alfps at start.no  Thu Mar 18 04:53:05 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Thu, 18 Mar 2010 09:53:05 +0100
Subject: import antigravity
In-Reply-To: <hnslv3$jjk$2@lust.ihug.co.nz>
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
	<hnslv3$jjk$2@lust.ihug.co.nz>
Message-ID: <hnsplj$4dt$1@news.eternal-september.org>

* Lawrence D'Oliveiro:
> In message <mailman.820.1268725930.23598.python-list at python.org>, Chris 
> Rebert wrote:
> 
> I see that you published my unobfuscated e-mail address on USENET for all to
> see. I obfuscated it for a reason, to keep the spammers away. I'm assuming
> this was a momentary lapse of judgement, for which I expect an apology.
> Otherwise, it becomes grounds for an abuse complaint to your ISP. 

Hi.

Chris Rebert didn't reveal anything not already present in the posting he 
replied to, and indeed in the posting I'm replying to here.

The headers in the article I'm replying to (yours) look like this:


<headers source="your article">
Path: 
feeder.eternal-september.org!eternal-september.org!feeder.erje.net!newsfeed.straub-nv.de!news.linkpendium.com!news.linkpendium.com!newsfeeds.ihug.co.nz!lust.ihug.co.nz!ihug.co.nz!not-for-mail
From: Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand>
Newsgroups: comp.lang.python
Subject: Re: import antigravity
Followup-To: comp.lang.python
Date: Thu, 18 Mar 2010 20:49:55 +1300
Organization: Geek Central
Lines: 7
Message-ID: <hnslv3$jjk$2 at lust.ihug.co.nz>
References: <hnnclk$eud$1 at lust.ihug.co.nz> 
<mailman.820.1268725930.23598.python-list at python.org>
NNTP-Posting-Host: 118-92-14-26.dsl.dyn.ihug.co.nz
Mime-Version: 1.0
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 7Bit
X-Trace: lust.ihug.co.nz 1268898595 20084 118.92.14.26 (18 Mar 2010 07:49:55 GMT)
X-Complaints-To: abuse at ihug.co.nz
NNTP-Posting-Date: Thu, 18 Mar 2010 07:49:55 +0000 (UTC)
User-Agent: KNode/4.3.4
Xref: eternal-september.org comp.lang.python:51777
</headers>


One must assume that you were not aware that you're posting your mail address in 
plaintext in every article?


Cheers & hth.,

- Alf


From mail at timgolden.me.uk  Thu Mar 18 04:54:58 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Thu, 18 Mar 2010 08:54:58 +0000
Subject: Win32All On 64-Bit Operating Systems
In-Reply-To: <4fr777-43o2.ln1@ozzie.tundraware.com>
References: <fpc777-2iu1.ln1@ozzie.tundraware.com>	<mailman.921.1268845558.23598.python-list@python.org>	<3rl777-q1m2.ln1@ozzie.tundraware.com>	<mailman.926.1268856005.23598.python-list@python.org>
	<4fr777-43o2.ln1@ozzie.tundraware.com>
Message-ID: <4BA1EA62.1010401@timgolden.me.uk>

On 17/03/2010 20:43, Tim Daneliuk wrote:
> The intent is just to provide as similar as possible a user experience.
>> From a coding POV, it is surely simpler to just use 'winuser' and 'wingroup',
> but I am sort of philosophically wired to not throw information away if
> it's a available from the OS.

It's hardly worth disputing I suppose, but I would argue that simply
presenting the owner & group of a file in Windows is actually doing
a disservice to the user of the app. It's cluttering up the display
with information which is essentially useless. Pretty much the only
time I ever look at a file owner is when I have some knotty security
issue and I need to assess who might have WRITE_DAC permission. The
group - never; it really is a relic.

The file owner & group simply don't play the same role in Windows
security that they do in *nix. The trouble is that there isn't a
simple alternative: most files, even with default security, will
have two or three groups involved in their security at different
levels.

> BTW, wanna beta test a really cool CLI mass file renaming tool????? ;)

Sure -- I'll have a look. But I can't promise any great amount of
time at present :)

TJG



From clp2 at rebertia.com  Thu Mar 18 04:56:49 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 18 Mar 2010 01:56:49 -0700
Subject: Recall: How to add a library path to pythonpath ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF684F3C839@enbmail01.lsi.com>
References: <7F0503CD69378F49BE0DC30661C6CCF684F3C839@enbmail01.lsi.com>
Message-ID: <50697b2c1003180156q61786c48i122e63caa94514bd@mail.gmail.com>

On Tue, Mar 16, 2010 at 4:56 AM, Barak, Ron <Ron.Barak at lsi.com> wrote:
> Barak, Ron would like to recall the message, "How to add a library path to pythonpath ?".

Good luck with that. :)

- Chris


From stefan_ml at behnel.de  Thu Mar 18 05:19:59 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Thu, 18 Mar 2010 10:19:59 +0100
Subject: import antigravity
In-Reply-To: <hnsplj$4dt$1@news.eternal-september.org>
References: <hnnclk$eud$1@lust.ihug.co.nz>	<mailman.820.1268725930.23598.python-list@python.org>	<hnslv3$jjk$2@lust.ihug.co.nz>
	<hnsplj$4dt$1@news.eternal-september.org>
Message-ID: <hnsr7v$f5v$1@dough.gmane.org>

Alf P. Steinbach, 18.03.2010 09:53:
> <headers source="your article">
> Path:
> feeder.eternal-september.org!eternal-september.org!feeder.erje.net!newsfeed.straub-nv.de!news.linkpendium.com!news.linkpendium.com!newsfeeds.ihug.co.nz!lust.ihug.co.nz!ihug.co.nz!not-for-mail
>
> From: Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand>
> Newsgroups: comp.lang.python
> Subject: Re: import antigravity
> Followup-To: comp.lang.python
> Date: Thu, 18 Mar 2010 20:49:55 +1300
> Organization: Geek Central
> Lines: 7
> Message-ID: <hnslv3$jjk$2 at lust.ihug.co.nz>
> References: <hnnclk$eud$1 at lust.ihug.co.nz>
> <mailman.820.1268725930.23598.python-list at python.org>
> NNTP-Posting-Host: 118-92-14-26.dsl.dyn.ihug.co.nz
> Mime-Version: 1.0
> Content-Type: text/plain; charset="ISO-8859-1"
> Content-Transfer-Encoding: 7Bit
> X-Trace: lust.ihug.co.nz 1268898595 20084 118.92.14.26 (18 Mar 2010
> 07:49:55 GMT)
> X-Complaints-To: abuse at ihug.co.nz
> NNTP-Posting-Date: Thu, 18 Mar 2010 07:49:55 +0000 (UTC)
> User-Agent: KNode/4.3.4
> Xref: eternal-september.org comp.lang.python:51777
> </headers>
>
>
> One must assume that you were not aware that you're posting your mail
> address in plaintext in every article?

Uhm - where?

Stefan



From news1234 at free.fr  Thu Mar 18 05:20:38 2010
From: news1234 at free.fr (News123)
Date: Thu, 18 Mar 2010 10:20:38 +0100
Subject: did anybody play with python and window mobile broadband?
Message-ID: <4ba1f067$0$4589$426a74cc@news.free.fr>

Hi,


I'd like to use a mobile broadband device with a windows python app.
Did anybody play already with python and the window mobile broadband
interface?

I'm looking for examples:
- how to connect/disconnect  a mobile broadband device (currently I use
rasdial. not sure it's the best solution)
- to obtain the device's current mode (GPRS / EDGE / . . . )
- to obtain the current signal level

Thanks a lot for any pointers



N



From sanjiva at croatia.oracle.in  Thu Mar 18 05:26:24 2010
From: sanjiva at croatia.oracle.in (Sanjiva P.)
Date: Thu, 18 Mar 2010 10:26:24 +0100
Subject: did anybody play with python and window mobile broadband?
References: <4ba1f067$0$4589$426a74cc@news.free.fr>
Message-ID: <hnsrih$9oi$1@speranza.aioe.org>

On 03/18/2010 10:20 AM, News123 wrote:
> I'm looking for examples:
> - how to connect/disconnect  a mobile broadband device (currently I use
> rasdial. not sure it's the best solution)
> - to obtain the device's current mode (GPRS / EDGE / . . . )
> - to obtain the current signal level
> 
> Thanks a lot for any pointers

Well no examples,but most or all of it should work through AT commands.

Did you try plugging the mobile broadband interface in?


From alfps at start.no  Thu Mar 18 05:29:04 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Thu, 18 Mar 2010 10:29:04 +0100
Subject: import antigravity
In-Reply-To: <mailman.949.1268904013.23598.python-list@python.org>
References: <hnnclk$eud$1@lust.ihug.co.nz>	<mailman.820.1268725930.23598.python-list@python.org>	<hnslv3$jjk$2@lust.ihug.co.nz>	<hnsplj$4dt$1@news.eternal-september.org>
	<mailman.949.1268904013.23598.python-list@python.org>
Message-ID: <hnsrp1$dpp$1@news.eternal-september.org>

* Stefan Behnel:
> Alf P. Steinbach, 18.03.2010 09:53:
>> <headers source="your article">
>> Path:
>> feeder.eternal-september.org!eternal-september.org!feeder.erje.net!newsfeed.straub-nv.de!news.linkpendium.com!news.linkpendium.com!newsfeeds.ihug.co.nz!lust.ihug.co.nz!ihug.co.nz!not-for-mail 
>>
>>
>> From: Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand>
>> Newsgroups: comp.lang.python
>> Subject: Re: import antigravity
>> Followup-To: comp.lang.python
>> Date: Thu, 18 Mar 2010 20:49:55 +1300
>> Organization: Geek Central
>> Lines: 7
>> Message-ID: <hnslv3$jjk$2 at lust.ihug.co.nz>
>> References: <hnnclk$eud$1 at lust.ihug.co.nz>
>> <mailman.820.1268725930.23598.python-list at python.org>
>> NNTP-Posting-Host: 118-92-14-26.dsl.dyn.ihug.co.nz
>> Mime-Version: 1.0
>> Content-Type: text/plain; charset="ISO-8859-1"
>> Content-Transfer-Encoding: 7Bit
>> X-Trace: lust.ihug.co.nz 1268898595 20084 118.92.14.26 (18 Mar 2010
>> 07:49:55 GMT)
>> X-Complaints-To: abuse at ihug.co.nz
>> NNTP-Posting-Date: Thu, 18 Mar 2010 07:49:55 +0000 (UTC)
>> User-Agent: KNode/4.3.4
>> Xref: eternal-september.org comp.lang.python:51777
>> </headers>
>>
>>
>> One must assume that you were not aware that you're posting your mail
>> address in plaintext in every article?
> 
> Uhm - where?

Well, at least the one that Chris Rebert quoted, 
<mailto:ldo at geek-central.gen.new_zealand> (in the 'From:' header).

The point is, if he's upset about Chris quoting that, then he's probably unaware 
that he's posting it in plaintext himself.


Cheers,

- Alf


From jpiitula at ling.helsinki.fi  Thu Mar 18 05:42:30 2010
From: jpiitula at ling.helsinki.fi (Jussi Piitulainen)
Date: 18 Mar 2010 11:42:30 +0200
Subject: import antigravity
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
	<hnslv3$jjk$2@lust.ihug.co.nz>
	<hnsplj$4dt$1@news.eternal-september.org>
	<mailman.949.1268904013.23598.python-list@python.org>
	<hnsrp1$dpp$1@news.eternal-september.org>
Message-ID: <qotwrxa3r09.fsf@ruuvi.it.helsinki.fi>

Alf P. Steinbach writes:

> The point is, if he's upset about Chris quoting that, then he's
> probably unaware that he's posting it in plaintext himself.

The complaint was not about quoting but about using in public. Chris
sent his piece to three addresses. From his headers, redacted:

   Newsgroups: comp.lang.python
   To: "Lawrence D'Oliveiro" <ldo at geek-central.gen.[REDACTED]>
   Cc: python-list at python.org

Can we stop importing red herrings now?


From 2ennel.0569 at gmail.com  Thu Mar 18 05:54:16 2010
From: 2ennel.0569 at gmail.com (LALITHA N)
Date: Thu, 18 Mar 2010 02:54:16 -0700 (PDT)
Subject: ARE YOU ARE FAMILIAR WITH ANY COMPUTER LANGUAGE-GET GOOD LUCK
Message-ID: <08d44b50-e96a-464f-9645-ce35b17eb1ab@t9g2000prh.googlegroups.com>

http://123maza.com/75/expressions


From alfps at start.no  Thu Mar 18 06:04:21 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Thu, 18 Mar 2010 11:04:21 +0100
Subject: import antigravity
In-Reply-To: <qotwrxa3r09.fsf@ruuvi.it.helsinki.fi>
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
	<hnslv3$jjk$2@lust.ihug.co.nz>
	<hnsplj$4dt$1@news.eternal-september.org>
	<mailman.949.1268904013.23598.python-list@python.org>
	<hnsrp1$dpp$1@news.eternal-september.org>
	<qotwrxa3r09.fsf@ruuvi.it.helsinki.fi>
Message-ID: <hnstr6$qu3$1@news.eternal-september.org>

* Jussi Piitulainen:
> Alf P. Steinbach writes:
> 
>> The point is, if he's upset about Chris quoting that, then he's
>> probably unaware that he's posting it in plaintext himself.
> 
> The complaint was not about quoting but about using in public. Chris
> sent his piece to three addresses. From his headers, redacted:
> 
>    Newsgroups: comp.lang.python
>    To: "Lawrence D'Oliveiro" <ldo at geek-central.gen.[REDACTED]>
>    Cc: python-list at python.org
> 
> Can we stop importing red herrings now?

Oh, I didn't see that  --  it's Bad Practice so I didn't look for it.


Cheers,

- Alf


From eglyph at gmail.com  Thu Mar 18 06:07:22 2010
From: eglyph at gmail.com (eglyph at gmail.com)
Date: Thu, 18 Mar 2010 03:07:22 -0700 (PDT)
Subject: did anybody play with python and window mobile broadband?
References: <4ba1f067$0$4589$426a74cc@news.free.fr>
Message-ID: <9fa65dc9-e9fc-4a35-a796-2e56980b63ac@t23g2000yqt.googlegroups.com>

On 18 ???, 11:20, News123 <news1... at free.fr> wrote:
> I'd like to use a mobile broadband device with a windows python app.
> Did anybody play already with python and the window mobile broadband
> interface?
>

There was a discussion on this subject in some local forum recently. I
assume you're using PythonCE, right?

The best solution proposed there was to use ctypes and WinAPI. You can
find a relatively high level APIs to set up a connection (without need
to go too low level with AT commands) and make your own wrapper.

A good starting point can be found here: http://msdn.microsoft.com/en-us/library/bb416346.aspx
(it's not the only way to to things, btw).

--
regards,
eGlyph


From eglyph at gmail.com  Thu Mar 18 06:19:55 2010
From: eglyph at gmail.com (eglyph at gmail.com)
Date: Thu, 18 Mar 2010 03:19:55 -0700 (PDT)
Subject: url2lib (windows 7) does not notice when network reconnects 
	(getaddrinfo problem)
References: <4ba15c0d$0$15456$426a74cc@news.free.fr>
Message-ID: <46a27485-cbe9-48e1-9055-f7d4d0d20785@u9g2000yqb.googlegroups.com>

On 18 ???, 00:47, News123 <news1... at free.fr> wrote:
> Hi,
>
> I'd like to write a function, that knows when the 'internet' is reachable.
>
> My setup is a windows7 host with a wireless USB modem. The modem might
> connect / disconnect any time.
>
> I thought I write a small function just checking whether I can fetch a url.
> ######### script starts
> import time,urllib2
>
> myurl = "http://www.mysite.com" # or "www.google.com" or whatever you like
>
> while True:
> ? ? connected = False
> ? ? try:
> ? ? ? ? urllib2.urlopen(myurl)
> ? ? ? ? connected = True
> ? ? except urllib2.URLError as e:
> ? ? ? ? print "urlerr %s" % e
> ? ? print "connected",connected
> ? ? time.sleep(1)
> ########## end of script
>
> if the network is connected when I start the script the first time after
> reboot, then ?I receive> connected True
>
> As expected
>
> If the network is disconnected when I start the script the first time
> after reboot, then ?I receive> urlerr <urlopen error [Errno 11004] getaddrinfo failed>
> > connected False
>
> as expected
>
> Things are getting weired, when my USB wireless modem connects after
> I started my script:
>
> It happens, that I just continue to receive:
>
> > urlerr <urlopen error [Errno 11004] getaddrinfo failed>
> > connected False
>
> however when I use a windows cmd window and I start
> "pingwww.mysite.com", then my python script recovers and reports
>
> > connected True
>
> My perhaps false conclusion is, that getaddrinfo() is not retrying to
> resolve an IP address, when it failed once.
>
> Is this behaviour known? Can this really be possible?
> I can reproduce this issue. not every time, but rather often.
>
> If yes, is there any way to force a new host name lookup under windows?
>
> What else could I be doing wrong?
>
> Thanks a lot in advance for any ideas
>
> N

Actually this should be expected behavior. Windows establishes
connection automatically when you start pinging something, your script
doesn't. Just check the connection state with winapi (ctypes?
pywin32?) and establish it if it isn't already.

--
regards, eGlyph


From sparks.m at gmail.com  Thu Mar 18 06:21:08 2010
From: sparks.m at gmail.com (Michael Sparks)
Date: Thu, 18 Mar 2010 03:21:08 -0700 (PDT)
Subject: Nested Scopes unintended behaviour ?
References: <7a110632-d6c5-446b-a34b-95548fadb2f9@r27g2000yqn.googlegroups.com>
	<hnqtbp$bbb$1@dough.gmane.org>
	<mailman.929.1268857761.23598.python-list@python.org>
Message-ID: <921f09da-bf41-4306-aca5-19baa70dd2b2@e7g2000yqf.googlegroups.com>

On Mar 17, 8:29?pm, Terry Reedy <tjre... at udel.edu> wrote:
> On 3/17/2010 11:44 AM, Emile van Sebille wrote:
>
> > On 3/17/2010 8:16 AM Michael Sparks said...
> >> Hi,
>
> >> Is the following behaviour expected ?
>
> > In short, yes. Assignment within a function forces the variable to
> > locals.
>
> In 3.x, one can declare names to be nonlocal (ie, local to some outer
> function, as opposed to local to the current function or module global).
> In your case,
> ? ?nonlocal on
> in your inner swtchfun function would give the behavior you wanted.

Ah, excellent. That makes python closures work more like I'd expect
them to. (A colleague had written the swtchfun I posted, whereas the
generator form was the version I wrote, and he was puzzled as to why
it didn't work as he expected. When I saw it I also couldn't see why.

After hearing it's expected behaviour in 2.6 it's clear that assigning
a name to a value declares the variable to be local, and that unlike
much of python (but like yield) this appears based on static analysis
of the function declaration, rather than dynamic. This does also make
sense since it prevents a name "switching scope" in a function, and a
"nonlocal" keyword also makes sense as a result.

Thanks to Emile for pointing out you can also do this in 2.6:
def Toggler(F, B):
    print F("Hello")
    print F("Hello")
    print F("Hello")
    print F("Hello")
    print F("Hello")

def Switcher(A,B):
    enclose={"on" : True}
    def swtchfun(msg, enclose=enclose):
        if enclose["on"]:
            enclose["on"] = False
            print "Switched to A"
            return A
        else:
            enclose["on"] = True
            print "Switched to B"
            return B
    #
    return Toggler(swtchfun,True)

Switcher(1,2)


I think personally I'd use the generator form myself, since I think
it's clearer (more clearly loops between the two), but this may be a
useful thing to know occasionally.

Cheers :-)


Michael.


From python.list at tim.thechases.com  Thu Mar 18 06:25:19 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Thu, 18 Mar 2010 05:25:19 -0500
Subject: os.walk restart
In-Reply-To: <68cbed3c-87f6-45c9-ac8e-a536cae20f26@k6g2000prg.googlegroups.com>
References: <a8c1c0df-cbfa-421c-a869-9f4c555a80ac@l11g2000pro.googlegroups.com>
	<68cbed3c-87f6-45c9-ac8e-a536cae20f26@k6g2000prg.googlegroups.com>
Message-ID: <4BA1FF8F.8080402@tim.thechases.com>

Steve Howell wrote:
> If that's the case, then you might be able to get away with just
> leaving some kind of breadcrumbs whenever you've successfully
> processed a directory or a file,

Unless you're indexing a read-only device (whether hardware 
read-only like a CD, or permission-wise read-only like a network 
share or a non-priv user walking system directories)...

> Also, I can understand why the operations on the files themselves
> might crash, but can't you catch an exception and keep on chugging?

I also wondered this one, perhaps logging the directory in which 
the exception happened to later revisit. :)

-tkc




From steve at holdenweb.com  Thu Mar 18 07:31:46 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 18 Mar 2010 07:31:46 -0400
Subject: import antigravity
In-Reply-To: <qotwrxa3r09.fsf@ruuvi.it.helsinki.fi>
References: <hnnclk$eud$1@lust.ihug.co.nz>	<mailman.820.1268725930.23598.python-list@python.org>	<hnslv3$jjk$2@lust.ihug.co.nz>	<hnsplj$4dt$1@news.eternal-september.org>	<mailman.949.1268904013.23598.python-list@python.org>	<hnsrp1$dpp$1@news.eternal-september.org>
	<qotwrxa3r09.fsf@ruuvi.it.helsinki.fi>
Message-ID: <hnt2vk$cba$1@dough.gmane.org>

Jussi Piitulainen wrote:
> Alf P. Steinbach writes:
> 
>> The point is, if he's upset about Chris quoting that, then he's
>> probably unaware that he's posting it in plaintext himself.
> 
> The complaint was not about quoting but about using in public. Chris
> sent his piece to three addresses. From his headers, redacted:
> 
>    Newsgroups: comp.lang.python
>    To: "Lawrence D'Oliveiro" <ldo at geek-central.gen.[REDACTED]>
>    Cc: python-list at python.org
> 
> Can we stop importing red herrings now?

Surely the point of such an obvious obfuscation is that humans can
de-obfuscate is easily. The fact that it was then used in an open
newsgroup communication is just part of the shit that happens every day.

Complaining to Chris's ISP is unlikely to be anything other than a waste
of time. Drawing attention to it the way Lawrence did is much more
likely to draw attention to it that simply gracefully letting it pass.

Lawrence, if you are so worried perhaps you should consider not using
e-mail any more. It's clearly too dangerous to suit you.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at REMOVE-THIS-cybersource.com.au  Thu Mar 18 07:52:08 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 18 Mar 2010 11:52:08 GMT
Subject: import antigravity
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
	<hnslv3$jjk$2@lust.ihug.co.nz>
	<mailman.944.1268900406.23598.python-list@python.org>
Message-ID: <4ba213e8$0$27806$c3e8da3@news.astraweb.com>

On Thu, 18 Mar 2010 09:17:43 +0100, Stefan Behnel wrote:

> Lawrence D'Oliveiro, 18.03.2010 08:49:
>> In message<mailman.820.1268725930.23598.python-list at python.org>, Chris
>> Rebert wrote:
>>
>> I see that you published my unobfuscated e-mail address on USENET for
>> all to see. I obfuscated it for a reason, to keep the spammers away.
>> I'm assuming this was a momentary lapse of judgement, for which I
>> expect an apology. Otherwise, it becomes grounds for an abuse complaint
>> to your ISP.
> 
> I hope you just had a bad day. Threatening others for figuring out your
> e-mail address is even worse than posting with an illegal e-mail
> address.

No, this is hardly the first time that Lawrence has made such a 
wankerific threat:

http://www.mail-archive.com/python-list%40python.org/msg245012.html


I sympathise, because many years ago I lost an email address, made 
unusable by spam, after using it unobfuscated in Usenet. But I think that 
the spammers have mostly moved on these days. The pickings are much 
richer for hijacking people's address books in Hotmail, Facebook or 
Outlook, and the state of the art of anti-spam is better too. So I think 
that Lawrence needs to HTFU and stop making empty threats over something 
so trivial.


-- 
Steven


From robin at reportlab.com  Thu Mar 18 08:06:16 2010
From: robin at reportlab.com (Robin Becker)
Date: Thu, 18 Mar 2010 12:06:16 +0000
Subject: bug in bdist_wininst cross compile?
In-Reply-To: <op.u9qecmi2x6zn5v@lepton.softlabbsas.com.ar>
References: <4BA0E958.8050205@chamonix.reportlab.co.uk>
	<op.u9qecmi2x6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <4BA21738.9070307@chamonix.reportlab.co.uk>

On 17/03/2010 21:37, Gabriel Genellina wrote:
> En Wed, 17 Mar 2010 11:38:16 -0300, Robin Becker <robin at reportlab.com>
> escribi?:
>
>> has anyone had any success with cross compilation and bdist_wininst; I
>> have modified build_ext very slightly to fix a small bug in cross
>> compilation related to library order.
>
> Please post your bug report + patch at http://bugs.python.org or it will
> be lost.
>

OK done
-- 
Robin Becker



From królewna at ee.pl  Thu Mar 18 08:58:32 2010
From: królewna at ee.pl (=?UTF-8?B?a3LDs2xld25h?=)
Date: Thu, 18 Mar 2010 13:58:32 +0100
Subject: sqlite3, memory db and multithreading
Message-ID: <hnt81m$fsi$1@news.task.gda.pl>

The problem is simple: I have multiple threads within one program. At 
least 2 threads have to have access to in-memory sqlite database. It is 
not possible to pass sqlite objects to those threads because an 
exception is rised:

ProgrammingError: SQLite objects created in a thread can only be used in 
that same thread.The object was created in thread id -1219066176 and 
this is thread id -1224475792

Is there any EASY way to use this in-memory db in many threads? Creating 
another connection is not a solution as it creates completely new db 
instead of connecting to the existing one.

--
Best regards
princess


From christian at dowski.com  Thu Mar 18 09:40:59 2010
From: christian at dowski.com (Christian)
Date: Thu, 18 Mar 2010 06:40:59 -0700 (PDT)
Subject: Feeding differeent data types to a class instance?
References: <ac9a5500-6b06-4fee-b483-bab76922b44e@d2g2000yqa.googlegroups.com>
	<mailman.728.1268571895.23598.python-list@python.org>
	<3189fde6-bd5e-4ee2-8a8e-41c55cf9f926@q23g2000yqd.googlegroups.com>
Message-ID: <72c18de4-0161-435f-a083-01d69151323a@x1g2000prb.googlegroups.com>

On Mar 14, 2:16?pm, kuru <maymunbe... at gmail.com> wrote:
> Hi
>
> Thank you so much for all these great suggestions. I will have time
> today to try all these and see which one works best for me

Answers to your question have spread onto the Python blogosphere as
well.

http://pythonconquerstheuniverse.wordpress.com/2010/03/17/multiple-constructors-in-a-python-class/

http://blog.dowski.com/2010/03/17/my-take-on-multiple-constructors/

That second one is my response.

Christian




From tundra at tundraware.com  Thu Mar 18 09:43:14 2010
From: tundra at tundraware.com (Tim Daneliuk)
Date: Thu, 18 Mar 2010 08:43:14 -0500
Subject: Win32All On 64-Bit Operating Systems
In-Reply-To: <mailman.947.1268902506.23598.python-list@python.org>
References: <fpc777-2iu1.ln1@ozzie.tundraware.com>	<mailman.921.1268845558.23598.python-list@python.org>	<3rl777-q1m2.ln1@ozzie.tundraware.com>	<mailman.926.1268856005.23598.python-list@python.org>	<4fr777-43o2.ln1@ozzie.tundraware.com>
	<mailman.947.1268902506.23598.python-list@python.org>
Message-ID: <f7n977-10t2.ln1@ozzie.tundraware.com>

On 3/18/2010 3:54 AM, Tim Golden wrote:
> On 17/03/2010 20:43, Tim Daneliuk wrote:
>> The intent is just to provide as similar as possible a user experience.
>>> From a coding POV, it is surely simpler to just use 'winuser' and
>>> 'wingroup',
>> but I am sort of philosophically wired to not throw information away if
>> it's a available from the OS.
> 
> It's hardly worth disputing I suppose, but I would argue that simply
> presenting the owner & group of a file in Windows is actually doing
> a disservice to the user of the app. It's cluttering up the display
> with information which is essentially useless. Pretty much the only
> time I ever look at a file owner is when I have some knotty security
> issue and I need to assess who might have WRITE_DAC permission. The
> group - never; it really is a relic.
> 
> The file owner & group simply don't play the same role in Windows
> security that they do in *nix. The trouble is that there isn't a
> simple alternative: most files, even with default security, will
> have two or three groups involved in their security at different
> levels.
> 
>> BTW, wanna beta test a really cool CLI mass file renaming tool????? ;)
> 
> Sure -- I'll have a look. But I can't promise any great amount of
> time at present :)
> 
> TJG
> 

I will announce the Beta for 'tren' here and you (and anyone else) can have at it.


-- 
----------------------------------------------------------------------------
Tim Daneliuk     tundra at tundraware.com
PGP Key:         http://www.tundraware.com/PGP/



From chris at simplistix.co.uk  Thu Mar 18 09:44:53 2010
From: chris at simplistix.co.uk (Chris Withers)
Date: Thu, 18 Mar 2010 13:44:53 +0000
Subject: converting a timezone-less datetime to seconds since the epoch
In-Reply-To: <50697b2c1003160713x7641d2cfn52a5e5ca199e26de@mail.gmail.com>
References: <4B9F8BE0.2050808@simplistix.co.uk>
	<50697b2c1003160713x7641d2cfn52a5e5ca199e26de@mail.gmail.com>
Message-ID: <4BA22E55.9040006@simplistix.co.uk>

Hey Chris,

Chris Rebert wrote:
>> def timestamp(dttm):
>>    return time.mktime(dttm.timetuple())
> 
> from calendar import timegm
> 
> def timestamp(dttm):
>     return timegm(dttm.utctimetuple())
> #the *utc*timetuple change is just for extra consistency
> #it shouldn't actually make a difference here

Ah, right. What on earth is timegm doing in calendar?
No way I ever would have thought to look there...

I wonder what the best way to get this stuff documented in the datetime 
modules docs is?

Chris

-- 
Simplistix - Content Management, Batch Processing & Python Consulting
             - http://www.simplistix.co.uk


From googler.1.webmaster at spamgourmet.com  Thu Mar 18 09:58:00 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Thu, 18 Mar 2010 06:58:00 -0700 (PDT)
Subject: C-API PyObject_Call
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
	<mailman.849.1268756405.23598.python-list@python.org>
	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>
	<mailman.858.1268759662.23598.python-list@python.org>
	<c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>
	<mailman.883.1268808393.23598.python-list@python.org>
	<3592cca0-2a4a-4a19-9e10-d80936e6d200@upsg2000gro.googlegroups.com>
	<mailman.943.1268899999.23598.python-list@python.org>
Message-ID: <793e5934-bc1b-4023-aa0e-bf6d956177fd@f8g2000yqn.googlegroups.com>

> Funny that you (being the OP) ask *me* what kind of line information *you*
> want.
>
> Stefan

Well, I need the line/file information of Python :


From 1 at depikt.net  Thu Mar 18 10:24:52 2010
From: 1 at depikt.net (DreiJane)
Date: Thu, 18 Mar 2010 07:24:52 -0700 (PDT)
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>
	<mailman.619.1268324988.23598.python-list@python.org>
	<4B992FB5.8090207@v.loewis.de> 
	<4B9A2810.9030602@chamonix.reportlab.co.uk>
	<4B9A614C.1080105@chamonix.reportlab.co.uk> 
	<4B9A9624.7040200@v.loewis.de>
	<mailman.783.1268647151.23598.python-list@python.org> 
	<8aa22e57-f152-4dc7-88da-cf6879de41f7@q16g2000yqq.googlegroups.com>
Message-ID: <c602af5c-842e-460b-814f-d8e922019a2d@q23g2000yqd.googlegroups.com>

Hello,

i've used reportlabs over two years now and was content with its
quality. These days i have turned to cairo and can only recommend to
do so: It is still easier to use (than the well-designed reportlabs
tools) and an engine working in a lot of other software too, for
example firefox.

Reasons for this: reportlabs do not even answer question about the
date to upgrade to Python3. Since Platypus isn't complete, i had to do
a lot with the primitves in the canvas object after all - that part of
my code got even shorter with cairo. For me - working with pygtk -
that spares two installations also.

To repear myself: I love cairo.

Regards, Joost



From alt.mcarter at googlemail.com  Thu Mar 18 10:45:54 2010
From: alt.mcarter at googlemail.com (Mark Carter)
Date: Thu, 18 Mar 2010 07:45:54 -0700 (PDT)
Subject: Install 2.6.4 as non-admin on Windows
Message-ID: <60c2ac2f-0472-4790-a879-533845bcedb5@q16g2000yqq.googlegroups.com>

How do I install python 2.6.4 on Windows without admin privileges?

Can I install it on a machine I control, zip up the contents, copy it
across to an admin-restricted machine, and set up a couple of
environemtn variables? Does python install files to system
directories, making this impossible?


From 1 at depikt.net  Thu Mar 18 10:49:29 2010
From: 1 at depikt.net (DreiJane)
Date: Thu, 18 Mar 2010 07:49:29 -0700 (PDT)
Subject: sqlite3, memory db and multithreading
References: <hnt81m$fsi$1@news.task.gda.pl>
Message-ID: <57dc1ce8-1ac7-4d72-aafc-6fe7920144c2@c16g2000yqd.googlegroups.com>

Hello,

i cannot help you directly with sqlite2 in the Standardlib, since i am
used to work with Roger Binns's apsw. After a short experiment with
pysqlite leading to data loss - caused by one of the unclearer
exception messages of sqlite3 and me having a bad day - i at once
turned back to apsw. And so far i haven't done much with threads.

Principally sqlite connections (sqlite3 objects in the C-API) can be
used over multiple threads - and connections to :memory: make no
difference. There are additional parameters to open() giving fine-
tuned control. And apsw is promising a true reflection of sqlite's C-
API.

Regards, Joost


From eglyph at gmail.com  Thu Mar 18 11:23:44 2010
From: eglyph at gmail.com (eglyph at gmail.com)
Date: Thu, 18 Mar 2010 08:23:44 -0700 (PDT)
Subject: Install 2.6.4 as non-admin on Windows
References: <60c2ac2f-0472-4790-a879-533845bcedb5@q16g2000yqq.googlegroups.com>
Message-ID: <3ab6c32c-3516-407c-8f89-da666fed86a5@z11g2000yqz.googlegroups.com>

On 18 ???, 16:45, Mark Carter <alt.mcar... at googlemail.com> wrote:
> How do I install python 2.6.4 on Windows without admin privileges?
>
> Can I install it on a machine I control, zip up the contents, copy it
> across to an admin-restricted machine, and set up a couple of
> environemtn variables? Does python install files to system
> directories, making this impossible?

The only file written to a system folder is python2x.dll (I think it's
not true for python2.6 any longer), so your approach is perfectly
valid if you can put this dll into a folder where it can be found by
the system.

PortablePython does this almost the same.

--
regards, eGlyph


From alt.mcarter at googlemail.com  Thu Mar 18 11:36:11 2010
From: alt.mcarter at googlemail.com (Mark Carter)
Date: Thu, 18 Mar 2010 08:36:11 -0700 (PDT)
Subject: Install 2.6.4 as non-admin on Windows
References: <60c2ac2f-0472-4790-a879-533845bcedb5@q16g2000yqq.googlegroups.com>
	<3ab6c32c-3516-407c-8f89-da666fed86a5@z11g2000yqz.googlegroups.com>
Message-ID: <99e3568c-0d48-46da-8483-6726b9cc9f58@l25g2000yqd.googlegroups.com>

On 18 Mar, 15:23, "egl... at gmail.com" <egl... at gmail.com> wrote:
> The only file written to a system folder is python2x.dll (I think it's
> not true for python2.6 any longer), so your approach is perfectly
> valid if you can put this dll into a folder where it can be found by
> the system.

Thanks. That sounds easy enough to do. I guess it's the same deal with
win32all.


From filip.popravi.stojmenovic at fer.hr  Thu Mar 18 12:17:11 2010
From: filip.popravi.stojmenovic at fer.hr (drstoka)
Date: Thu, 18 Mar 2010 17:17:11 +0100
Subject: Need to create subprocess...
Message-ID: <hntjrc$m6k$1@sunce.iskon.hr>

Hello,

I have to run a program as a child process inside my python program and 
redirect it's output through a pipe to a parent program process.
So, I wrote this:

pipe = Popen('example_program', shell=True, bufsize=0, stdout=PIPE).stdout

and it works great.

Now, in parent program I need to wait for a some time and if a child 
(example_program) does not finish in that time, kill the child.

How do I do that? Please help. 




From sccolbert at gmail.com  Thu Mar 18 12:28:53 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Thu, 18 Mar 2010 12:28:53 -0400
Subject: C++ code generation
In-Reply-To: <24b7e9.8952.1276b803126.Coremail.dr.cg@126.com>
References: <24b7e9.8952.1276b803126.Coremail.dr.cg@126.com>
Message-ID: <7f014ea61003180928q4763a819ic548364e2811952d@mail.gmail.com>

I think Stefan was telling you, in a nice way, to stop spamming every thread
about code generation with a plug for your project.

2010/3/17 CHEN Guang <dr.cg at 126.com>

> >> ----- Original Message -----
> >> From: "Dan Goodman"<dg.gmane at thesamovar.net>
> >>
> >>> I'm doing some C++ code generation using Python, and would be
> interested
> >>> in any comments on the approach I'm taking.
> >>
> >> PythoidC ( http://pythoidc.googlecode.com ) is a C code generator (not
> C++)
> >
> > It would be nice if you could start reading the posts before you answer,
> > and then try to give an answer that fits the question.
> >
> > Stefan
>
> I have read the post, may be I lost some words and made you misunderstand.
> I meant:
> PythoidC ( http://pythoidc.googlecode.com ) is a C code generator (but not
> C++), if you find it useful,
> welcome to take a look.
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From tim.arnold at sas.com  Thu Mar 18 12:38:34 2010
From: tim.arnold at sas.com (Tim Arnold)
Date: Thu, 18 Mar 2010 12:38:34 -0400
Subject: multiprocessing on freebsd
References: <f1121800-f416-4455-b223-dfa562edb853@t23g2000yqt.googlegroups.com>
	<hnrabj$c4v$1@news.eternal-september.org>
Message-ID: <hntkua$39k$1@foggy.unx.sas.com>

"Martin P. Hellwig" <martin.hellwig at dcuktec.org> wrote in message 
news:hnrabj$c4v$1 at news.eternal-september.org...
> On 03/17/10 13:30, Tim Arnold wrote:
>> Hi,
>> I'm checking to see if multiprocessing works on freebsd for any
>> version of python. My server is about to get upgraded from 6.3 to 8.0
>> and I'd sure like to be able to use multiprocessing.
>>
>> I think the minimal test would be:
>> ---------------------
>> import multiprocessing
>> q = multiprocessing.Queue()
>> ---------------------
>>
>> with 6.3, I get
>>
>>   File "/usr/local/lib/python2.6/multiprocessing/__init__.py", line
>> 212, in Queue
>>      from multiprocessing.queues import Queue
>>    File "/usr/local/lib/python2.6/multiprocessing/queues.py", line 22,
>> in<module>
>>      from multiprocessing.synchronize import Lock, BoundedSemaphore,
>> Semaphore, Condition
>>    File "/usr/local/lib/python2.6/multiprocessing/synchronize.py", line
>> 33, in<module>
>>      " function, see issue 3770.")
>> ImportError: This platform lacks a functioning sem_open
>> implementation, therefore, the required synchronization primitives
>> needed will not function, see issue 3770.
>>
>
> Build mine from ports, with the following options (notice SEM & PTH):
> [martin at aspire8930 /usr/home/martin]$ cat /var/db/ports/python26/options
> # This file is auto-generated by 'make config'.
> # No user-servicable parts inside!
> # Options for python26-2.6.4
> _OPTIONS_READ=python26-2.6.4
> WITH_THREADS=true
> WITHOUT_HUGE_STACK_SIZE=true
> WITH_SEM=true
> WITH_PTH=true
> WITH_UCS4=true
> WITH_PYMALLOC=true
> WITH_IPV6=true
> WITHOUT_FPECTL=true
>
> [martin at aspire8930 /usr/home/martin]$ uname -a
> FreeBSD aspire8930 8.0-STABLE FreeBSD 8.0-STABLE #3: Wed Feb  3 17:01:18 
> GMT 2010     martin at aspire8930:/usr/obj/usr/src/sys/ASPIRE8930  amd64
> [martin at aspire8930 /usr/home/martin]$ python
> Python 2.6.4 (r264:75706, Mar 17 2010, 18:44:24)
> [GCC 4.2.1 20070719  [FreeBSD]] on freebsd8
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import multiprocessing as mp
> >>> queue = mp.Queue()
> >>>
>
> hth
> -- 
> mph

Hi Martin, thanks very much for posting that. All I can say is YAY! I'm 
really looking forward to my machine's upgrade now!

thanks,
--Tim




From stefan_ml at behnel.de  Thu Mar 18 12:43:28 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Thu, 18 Mar 2010 17:43:28 +0100
Subject: C-API PyObject_Call
In-Reply-To: <793e5934-bc1b-4023-aa0e-bf6d956177fd@f8g2000yqn.googlegroups.com>
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>	<mailman.849.1268756405.23598.python-list@python.org>	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>	<mailman.858.1268759662.23598.python-list@python.org>	<c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>	<mailman.883.1268808393.23598.python-list@python.org>	<3592cca0-2a4a-4a19-9e10-d80936e6d200@upsg2000gro.googlegroups.com>	<mailman.943.1268899999.23598.python-list@python.org>
	<793e5934-bc1b-4023-aa0e-bf6d956177fd@f8g2000yqn.googlegroups.com>
Message-ID: <hntl7f$po0$1@dough.gmane.org>

moerchendiser2k3, 18.03.2010 14:58:
>> Funny that you (being the OP) ask *me* what kind of line information *you*
>> want.
>>
>> Stefan
>
> Well, I need the line/file information of Python :

Then please explain what kind of Python line number you expect to find in C 
code.

Hint: providing details often results in getting helpful answers.

Stefan



From jjposner at optimum.net  Thu Mar 18 12:48:35 2010
From: jjposner at optimum.net (John Posner)
Date: Thu, 18 Mar 2010 12:48:35 -0400
Subject: Method / Functions - What are the differences?
In-Reply-To: <mailman.590.1268272205.23598.python-list@python.org>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>	<4b8c2a34$0$10470$426a74cc@news.free.fr>	<mailman.81.1267492052.23598.python-list@python.org>	<4b8cd310$0$4604$426a34cc@news.free.fr>	<mailman.109.1267539415.23598.python-list@python.org>	<hmk1mn$70u$1@newsreader3.netcologne.de>	<4b8e4041$0$17447$426a34cc@news.free.fr>
	<hmlte9$d0f$1@dough.gmane.org>	<mailman.205.1267633968.23598.python-list@python.org>	<4b8e9660$0$21812$426a34cc@news.free.fr>	<hmmrh4$644$1@newsreader3.netcologne.de>
	<4B8EF717.3070701@optimum.net>	<4b902338$0$31260$607ed4bc@cv.net>	<4b90f5eb$0$9148$426a74cc@news.free.fr>	<4b911ee0$0$4988$607ed4bc@cv.net>
	<4B97B092.4060901@optimum.net>
	<mailman.590.1268272205.23598.python-list@python.org>
Message-ID: <4BA25963.1060802@optimum.net>

On 3/10/2010 8:37 PM, Gabriel Genellina wrote:
> En Wed, 10 Mar 2010 11:45:38 -0300, John Posner <jjposner at optimum.net>
> escribi?:
>
>> As I promised/threatened, here's the *start* of a write-up on
>> properties, aimed at non-advanced Python programmers:
>>
>> http://www.jjposner.net/media/python-properties-0310.pdf
>
> I'd use 'function' instead of 'procedure', as this last word is very
> uncommon in Python literature (also, "the procedure's return value..." may
> look very strange to some people).

I was trying to avoid the function-vs-method swamp, and so I used 
"procedure". I agree that it was an unfortunate strategy. In a rewrite, 
I'm using "function" for the most part

>
> I'm unsure if one should make a distinction 'storage attribute' vs.
> 'method attribute', or even if it makes things actually more clear.

Agreed -- I was trying too hard to be helpful, and introduced 
unnecessary terminology.

> ... I
> think you could present the motivating idea first ("I want to execute some
> code when accessing an attribute") and only later talk about properties

That was my intention. I hope it comes across more clearly in the rewrite.

> and descriptors (as written, the reader still doesn't know how to define a
> simple property and you've already talked about deleting attributes...)

That doesn't bother me. It's OK to describe capabilities -- but not give 
how-to's -- in an overview section.



And Edward Cherlin wrote:

> I find that it will explain things to those who already understand
> most of the concepts. However, I felt as though I were being led
> through a maze without knowing where we were headed.

   ...

> Who is your expected audience?

I was headed toward having the reader *really* understand the @property 
decorator. And I was intending that reader to be a non-advanced Python 
user -- say, at the CS 101 level. I'm now convinced that such a goal was 
"a bridge too far". It has a lot moving parts, including a prerequisite 
that is a major topic in itself -- the descriptor protocol. That puts 
the goal way beyond reach.




There's another draft at:

   http://www.jjposner.net/media/python-properties-0318.pdf


Many thanks for your comments,
John


From martin.hellwig at dcuktec.org  Thu Mar 18 13:25:33 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Thu, 18 Mar 2010 17:25:33 +0000
Subject: Need to create subprocess...
In-Reply-To: <hntjrc$m6k$1@sunce.iskon.hr>
References: <hntjrc$m6k$1@sunce.iskon.hr>
Message-ID: <hntnm9$9hf$1@news.eternal-september.org>

On 03/18/10 16:17, drstoka wrote:
> Hello,
>
> I have to run a program as a child process inside my python program and
> redirect it's output through a pipe to a parent program process.
> So, I wrote this:
>
> pipe = Popen('example_program', shell=True, bufsize=0, stdout=PIPE).stdout
>
> and it works great.
>
> Now, in parent program I need to wait for a some time and if a child
> (example_program) does not finish in that time, kill the child.
>
> How do I do that? Please help.
>
>
Try searching around for "threading.thread python" it should give you 
some clues, if you can't work through the info (it can be a bit hard to 
digest), just post here an example of your test code along with what you 
expected and what didn't happen.

-- 
mph


From pmaupin at gmail.com  Thu Mar 18 13:30:01 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Thu, 18 Mar 2010 10:30:01 -0700 (PDT)
Subject: Need to create subprocess...
References: <hntjrc$m6k$1@sunce.iskon.hr>
Message-ID: <7f37f154-e3f1-4666-8298-0bf352ebc480@r1g2000yqj.googlegroups.com>

On Mar 18, 11:17?am, "drstoka" <filip.popravi.stojmeno... at fer.hr>
wrote:
> Hello,
>
> I have to run a program as a child process inside my python program and
> redirect it's output through a pipe to a parent program process.
> So, I wrote this:
>
> pipe = Popen('example_program', shell=True, bufsize=0, stdout=PIPE).stdout
>
> and it works great.
>
> Now, in parent program I need to wait for a some time and if a child
> (example_program) does not finish in that time, kill the child.
>
> How do I do that? Please help.

I have a module that does this and more, but it only works on Linux:

http://code.google.com/p/rst2pdf/source/browse/trunk/rst2pdf/tests/execmgr.py

For usage examples, you can just execute it.  Also, see autotest.py in
the same directory.

Regards,
Pat


From jlundell at pobox.com  Thu Mar 18 14:01:18 2010
From: jlundell at pobox.com (JLundell)
Date: Thu, 18 Mar 2010 11:01:18 -0700 (PDT)
Subject: class inheritance
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
	<9bb4c1e7-858e-4ee6-870b-5a6549b6c496@b36g2000pri.googlegroups.com> 
	<05d0d40f-3fa0-4095-875d-777b49122d12@l12g2000prg.googlegroups.com> 
	<pan.2010.03.18.00.12.14@REMOVE.THIS.cybersource.com.au>
Message-ID: <25fb9401-74df-44fd-bc91-796a6b128151@a31g2000prd.googlegroups.com>

On Mar 17, 5:12?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 15 Mar 2010 16:34:35 -0700,JLundellwrote:
> > It's also unfortunate that Python doesn't have an approximately-equal
> > operator; it'd come in handy for floating-point applications while
> > preserving hash. If only there were a ~= or ? operator I could overload.
> > And ~ is unary, so no joy.
>
> Not everything needs to be a built-in, or an operator. This might be
> useful for you:
>
> http://code.activestate.com/recipes/577124-approximately-equal/
>
> Feedback welcome.
>
> --
> Steven

Thanks, Steven. I'd considered and rejected that a while ago, but on
reconsideration it's sounding like a better idea. Aside from
preserving the semantics of =, it makes the use of approximate
equality explicit in the code, and that's a plus for what I'm doing.
I'll give it a shot.


From news1234 at free.fr  Thu Mar 18 15:29:37 2010
From: news1234 at free.fr (News123)
Date: Thu, 18 Mar 2010 20:29:37 +0100
Subject: did anybody play with python and window mobile broadband?
In-Reply-To: <hnsrih$9oi$1@speranza.aioe.org>
References: <4ba1f067$0$4589$426a74cc@news.free.fr>
	<hnsrih$9oi$1@speranza.aioe.org>
Message-ID: <4ba27f21$0$23458$426a74cc@news.free.fr>

Hi Sanjiva,


Sanjiva P. wrote:
> On 03/18/2010 10:20 AM, News123 wrote:
>> I'm looking for examples:
>> - how to connect/disconnect  a mobile broadband device (currently I use
>> rasdial. not sure it's the best solution)
>> - to obtain the device's current mode (GPRS / EDGE / . . . )
>> - to obtain the current signal level
>>
>> Thanks a lot for any pointers
> 
> Well no examples,but most or all of it should work through AT commands.
Thanks, yes AT commands would be fine.
How can I send AT commands, while another application / connection
mnager is using the modem?


I just don't know how to send AT commands to a connected modem.


> 
> Did you try plugging the mobile broadband interface in?

What do you mean with pluggging in?

ctypes?
or something else?




bye


N


From news1234 at free.fr  Thu Mar 18 15:32:23 2010
From: news1234 at free.fr (News123)
Date: Thu, 18 Mar 2010 20:32:23 +0100
Subject: did anybody play with python and window mobile broadband?
In-Reply-To: <9fa65dc9-e9fc-4a35-a796-2e56980b63ac@t23g2000yqt.googlegroups.com>
References: <4ba1f067$0$4589$426a74cc@news.free.fr>
	<9fa65dc9-e9fc-4a35-a796-2e56980b63ac@t23g2000yqt.googlegroups.com>
Message-ID: <4ba27fc7$0$23458$426a74cc@news.free.fr>

Hy Eglyph,

eglyph at gmail.com wrote:
> On 18 ???, 11:20, News123 <news1... at free.fr> wrote:
>> I'd like to use a mobile broadband device with a windows python app.
>> Did anybody play already with python and the window mobile broadband
>> interface?
>>
> 
> There was a discussion on this subject in some local forum recently. I
> assume you're using PythonCE, right?

No I'm using C-Python on a small windows PC (Atom) with a USB Boradband
modem.

Could you forward me the discussion in case you remember the forum?


> 
> The best solution proposed there was to use ctypes and WinAPI. You can
> find a relatively high level APIs to set up a connection (without need
> to go too low level with AT commands) and make your own wrapper.
> 
> A good starting point can be found here: http://msdn.microsoft.com/en-us/library/bb416346.aspx
> (it's not the only way to to things, btw).

Thanks, I'll read into it.

bye

N




From wingusr at gmail.com  Thu Mar 18 15:36:20 2010
From: wingusr at gmail.com (TP)
Date: Thu, 18 Mar 2010 12:36:20 -0700
Subject: highlight words by regex in pdf files using python
In-Reply-To: <366c6f341003170753o36316de3ie13f11fad0b29900@mail.gmail.com>
References: <af0830ae-1d24-4db9-b721-d6602fedd540@15g2000yqi.googlegroups.com>
	<1fc72785-e527-4809-b5a1-43d78fe86f87@r27g2000yqn.googlegroups.com>
	<366c6f341003170753o36316de3ie13f11fad0b29900@mail.gmail.com>
Message-ID: <fe0b845a1003181236s586d41bcuacf5adbf817024b9@mail.gmail.com>

On Wed, Mar 17, 2010 at 7:53 AM, Peng Yu <pengyu.ut at gmail.com> wrote:
> On Tue, Mar 16, 2010 at 11:12 PM, Patrick Maupin <pmaupin at gmail.com> wrote:
>> On Mar 4, 6:57?pm, Peng Yu <pengyu... at gmail.com> wrote:
>>> I don't find a general pdf library in python that can do any
>>> operations on pdfs.
>>>
>>> I want to automatically highlight certain words (using regex) in a
>>> pdf. Could somebody let me know if there is a tool to do so in python?
>>
>> The problem with PDFs is that they can be quite complicated. ?There is
>> the outer container structure, which isn't too bad (unless the
>> document author applied encryption or fancy multi-object compression),
>> but then inside the graphics elements, things could be stored as
>> regular ASCII, or as fancy indexes into font-specific tables. ?Not
>> rocket science, but the only industrial-strength solution for this is
>> probably reportlab's pagecatcher.
>>
>> I have a library which works (primarily with the outer container) for
>> reading and writing, called pdfrw. ?I also maintain a list of other
>> PDF tools at http://code.google.com/p/pdfrw/wiki/OtherLibraries ?It
>> may be that pdfminer (link on that page) will do what you want -- it
>> is certainly trying to be complete as a PDF reader. ?But I've never
>> personally used pdfminer.
>>
>> One of my pdfrw examples at http://code.google.com/p/pdfrw/wiki/ExampleTools
>> will read in preexisting PDFs and write them out to a reportlab
>> canvas. ?This works quite well on a few very simple ASCII PDFs, but
>> the font handling needs a lot of work and probably won't work at all
>> right now on unicode. ?(But if you wanted to improve it, I certainly
>> would accept patches or give you commit rights!)
>>
>> That pdfrw example does graphics reasonably well. ?I was actually
>> going down that path for getting better vector graphics into rst2pdf
>> (both uniconvertor and svglib were broken for my purposes), but then I
>> realized that the PDF spec allows you to include a page from another
>> PDF quite easily (the spec calls it a form xObject), so you don't
>> actually need to parse down into the graphics stream for that. ?So,
>> right now, the best way to do vector graphics with rst2pdf is either
>> to give it a preexisting PDF (which it passes off to pdfrw for
>> conversion into a form xObject), or to give it a .svg file and invoke
>> it with -e inkscape, and then it will use inkscape to convert the svg
>> to a pdf and then go through the same path.
>
> Thank you for your long reply! But I'm not sure if you get my question or not.
>
> Acrobat can highlight certain words in pdfs. I could add notes to the
> highlighted words as well. However, I find that I frequently end up
> with highlighting some words that can be expressed by a regular
> expression.
>
> To improve my productivity, I don't want do this manually in Acrobat
> but rather do it in an automatic way, if there is such a tool
> available. People in reportlab mailing list said this is not possible
> with reportlab. And I don't see PyPDF can do this. If you know there
> is an API to for this purpose, please let me know. Thank you!
>
> Regards,
> Peng
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Take a look at the Acrobat SDK
(http://www.adobe.com/devnet/acrobat/?view=downloads). In particular
see the Acrobat Interapplication Communication information at
http://www.adobe.com/devnet/acrobat/interapplication_communication.html.

"Spell-checking a document" shows how to spell check a PDF using
visual basic at
http://livedocs.adobe.com/acrobat_sdk/9.1/Acrobat9_1_HTMLHelp/wwhelp/wwhimpl/common/html/wwhelp.htm?context=Acrobat9_HTMLHelp&file=IAC_DevApp_OLE_Support.100.17.html

"Working with annotations" shows how to add an annotation with visual
basic at http://livedocs.adobe.com/acrobat_sdk/9.1/Acrobat9_1_HTMLHelp/wwhelp/wwhimpl/common/html/wwhelp.htm?context=Acrobat9_HTMLHelp&file=IAC_DevApp_OLE_Support.100.16.html.

Presumably combining the two examples with Python's win32com should
allow you to do what you want.


From bettylive at gmail.com  Thu Mar 18 15:51:47 2010
From: bettylive at gmail.com (=?ISO-8859-1?Q?Bet=FCl?=)
Date: Thu, 18 Mar 2010 21:51:47 +0200
Subject: importing python project in my application
Message-ID: <a53024331003181251y23466b6cn9972471de33ab763@mail.gmail.com>

Hello All,


I am new this mail list.
I try to embedding python in C++.
I want to use this project's class http://gamera.informatik.hsnr.de/
It is a framework in python.
I want use Gamera 's classes,functions..etc in my c++ project.
I have information about embedding python in c++ but i just want to learn
that "how can i import to Gamera into the my c++ project"?


Please, help me.
it can be more questions after this :)

Best Regards
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From magicus23REMOVE-THIS at gmail.com  Thu Mar 18 16:44:18 2010
From: magicus23REMOVE-THIS at gmail.com (furlan)
Date: Thu, 18 Mar 2010 20:44:18 +0000 (UTC)
Subject: question about tkinter
References: <mailman.903.1268829586.23598.python-list@python.org>
	<hnqjoo$g4o$02$1@news.t-online.com>
	<mailman.906.1268832771.23598.python-list@python.org>
Message-ID: <hnu3b2$148$1@news.eternal-september.org>

On Wed, 17 Mar 2010 09:32:46 -0400, robert schaefer wrote:

> Peter,
> 
> Most of my life has been dealing with recalcitrant HAL's in one guise or
> another. These days, I think HAL has permanently taken up residence in
> Toyota's engine and brakes. "Stop the car Dave? Have you changed my oil
> or even washed me lately?" Some serious "sneak paths" are going on.

<snip>

Don't know if this will help and I had in a file in my Solutions folder
from 2008 the following:

If Tkinter does not seem to be loaded run:

sudo yum -y install python-tools

which will install Tkinter and dependencies.

HTH

ciao,
f

-- 
aa #2301
"I often work by avoidance."
-- Brian Eno


From sluggoster at gmail.com  Thu Mar 18 16:52:00 2010
From: sluggoster at gmail.com (Mike Orr)
Date: Thu, 18 Mar 2010 13:52:00 -0700 (PDT)
Subject: Need advice on starting a Python group
References: <hnb0d1$2el$1@reader1.panix.com>
Message-ID: <b47155a9-2441-4183-98d7-a4c8307362ea@q2g2000pre.googlegroups.com>

On Mar 11, 7:57?am, gb345 <gb... at invalid.com> wrote:
> I'm hoping to get advice from anyone with prior experience setting
> up a Python group.
>
> A friend of mine and I have been trying to start a
> scientific-programming-oriented Python group in our school (of
> medecine and bio research), with not much success.
>
> The main problem is attendance. ?Even though a *ton* of people have
> told us that it's a great idea, that they're *very* interested,
> and have asked to be added to our mailing list, the attendance to
> our first few meeting has never been more than 5, including my
> friend and I. ?Last time just he and I showed up.
>
> The second problem is getting content. ?The format we'd envisioned
> for this group was centered around code review (though not limited
> to it). ?The idea was that at every meeting a different member
> would show some code. ?This could be for any of a number of reasons,
> such as, for example, 1) illustrate a cool module or technique; 2)
> present a scientific research problem and how they used Python to
> solve it, or get help solving it; 3) get general feedback (e.g. on
> code clarity, software usability, module architecture, etc.). ?But
> in principle just about anything is OK: e.g. a talk on favorite
> Python resources, or a comparison of Python with some other language,
> or an overview of Python gotchas would all be fair game.

I've been involved in a Python users group since 2000, and have
attended or heard about a few others. The ones that have 20+ attendees
have a speaker every month. Our group is usually a show-and-tell and
open discussion, so we get around six people each month (but not the
same six). We've decided to solicit more talks as a way to increase
attendance.

I have never heard of a Python group focusing on code review, so I
don't know what attendance to expect for that. One problem is that
much of people's code is private at their workplace, and they can't
bring it to a meeting. I'd suggest expanding the focus a bit: code
review, writing unit tests for each other, pair programming, some open
"How do I do this in Python?" discussions, etc.

You're also limiting the pool of potential attendees by targeting one
institution. There are only a subset there who are interested in
Python, a smaller subset who can attend meetings, and an even smaller
subset who are willing to attend meetings even if they can. A citywide
group or at least bringing in other institutions would hopefully
increase attendance. Although it may be harder to keep the scientific
focus with that.  But on the other hand, here the specialized groups
are getting more attendance than the general groups are. The local
Plone and Django groups get more people than the Python group does.

--Mike


From mail at hellmutweber.de  Thu Mar 18 17:05:37 2010
From: mail at hellmutweber.de (Hellmut Weber)
Date: Thu, 18 Mar 2010 22:05:37 +0100
Subject: logging: local functions ==> loss of lineno
In-Reply-To: <hnaj9c$i0u$02$1@news.t-online.com>
References: <mailman.576.1268256192.23598.python-list@python.org>
	<hnaj9c$i0u$02$1@news.t-online.com>
Message-ID: <4BA295A1.70207@hellmutweber.de>

Am 11.03.2010 12:14, schrieb Peter Otten:
> Hellmut Weber wrote:
>
>> Logging works very well giving the filename and line number of the point
>> where it is called. As long as I use the loggers directly.
>> BUT when I have to wrap the logger call in some other function, I always
>> get file name and line number of the call of the logger inside the
>> wrapping function.
>>
>> Is there a possibility to get this information in this situation too?
>
> The official way is probably to write a custom Logger class that overrides
> the findCaller() method.
>
> Below is a hack that monkey-patches the logging._srcfile attribute to ignore
> user-specified modules in the call stack:
>
> $ cat wrapper.py
> import logging
> import os
> import sys
>
> logger = logging.getLogger()
>
> class SrcFile(object):
>      def __init__(self, exclude_files):
>          self.files = set(exclude_files)
>      def __eq__(self, other):
>          return other in self.files
>
> def fixname(filename):
>      if filename.lower().endswith((".pyc", ".pyo")):
>          filename = filename[:-4] + ".py"
>      return os.path.normcase(filename)
>
> if "--monkey" in sys.argv:
>      print "patching"
>      logging._srcfile = SrcFile([logging._srcfile, fixname(__file__)])
>
> def warn(*args, **kw):
>      logger.warn(*args, **kw)
>
> $ cat main.py
> import logging
> logging.basicConfig(format="%(filename)s<%(lineno)s>: %(message)s")
> import wrapper
> wrapper.warn("foo")
> wrapper.warn("bar")
> wrapper.warn("baz")
>
> $ python main.py
> wrapper.py<23>: foo
> wrapper.py<23>: bar
> wrapper.py<23>: baz
>
> $ python main.py --monkey
> patching
> main.py<4>: foo
> main.py<5>: bar
> main.py<6>: baz
>
> $ python -V
> Python 2.6.4
>
> Peter

Hi Peter,
your hack is exactly what I was looking for.
It permits to configure my logging messages as I want, e.g. using 
different colors for different classes of messages.

I do not yet understand all details WHY it is working but suppose some 
study of the logging module will help me to understand.

Thank you very much

-- 
Dr. Hellmut Weber         mail at hellmutweber.de
Degenfeldstra?e 2         tel   +49-89-3081172
D-80803 M?nchen-Schwabing mobil +49-172-8450321
please: No DOCs, no PPTs. why: tinyurl.com/cbgq



From tjreedy at udel.edu  Thu Mar 18 17:13:18 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 18 Mar 2010 17:13:18 -0400
Subject: Nested Scopes unintended behaviour ?
In-Reply-To: <921f09da-bf41-4306-aca5-19baa70dd2b2@e7g2000yqf.googlegroups.com>
References: <7a110632-d6c5-446b-a34b-95548fadb2f9@r27g2000yqn.googlegroups.com>	<hnqtbp$bbb$1@dough.gmane.org>	<mailman.929.1268857761.23598.python-list@python.org>
	<921f09da-bf41-4306-aca5-19baa70dd2b2@e7g2000yqf.googlegroups.com>
Message-ID: <hnu51h$p0l$1@dough.gmane.org>

On 3/18/2010 6:21 AM, Michael Sparks wrote:

> After hearing it's expected behaviour in 2.6 it's clear that assigning
> a name to a value declares the variable to be local,

unless there is a global/nonlocal declaration

  and that unlike
> much of python (but like yield) this appears based on static analysis
> of the function declaration, rather than dynamic.

The language definition requires two passes after parsing.
One collects names and determines their scope (and looks for yield). The 
second generates code.
This allows the local namespace to be implemented as an array rather 
than a dict, so that local name lookup is an array index operation 
rather than a dict lookup operation. This is somewhat made visible by 
the dis module

 >>> from dis import dis
 >>> a = 1
 >>> def f():
	b = 2
	return a,b

 >>> dis(f)
   2           0 LOAD_CONST               1 (2)
               3 STORE_FAST               0 (b)

   3           6 LOAD_GLOBAL              0 (a)
               9 LOAD_FAST                0 (b)
              12 BUILD_TUPLE              2
              15 RETURN_VALUE

STORE/LOAD_FAST means store/load_local. Constants (2 in this case) are 
stored in the same array. There is apparently a separate array of global 
names, as opposed to local values.

Terry Jan Reedy



From aahz at pythoncraft.com  Thu Mar 18 18:06:00 2010
From: aahz at pythoncraft.com (Aahz)
Date: 18 Mar 2010 15:06:00 -0700
Subject: sqlite3, memory db and multithreading
References: <hnt81m$fsi$1@news.task.gda.pl>
Message-ID: <hnu848$oo7$1@panix5.panix.com>

In article <hnt81m$fsi$1 at news.task.gda.pl>,
=?UTF-8?B?a3LDs2xld25h?=  <kr?lewna at ee.pl> wrote:
>
>The problem is simple: I have multiple threads within one program. At 
>least 2 threads have to have access to in-memory sqlite database. It is 
>not possible to pass sqlite objects to those threads because an 
>exception is rised:
>
>ProgrammingError: SQLite objects created in a thread can only be used in 
>that same thread.The object was created in thread id -1219066176 and 
>this is thread id -1224475792
>
>Is there any EASY way to use this in-memory db in many threads? Creating 
>another connection is not a solution as it creates completely new db 
>instead of connecting to the existing one.

You probably need to serialize access to the database through one thread.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From slais-www at ucl.ac.uk  Thu Mar 18 18:29:41 2010
From: slais-www at ucl.ac.uk (djc)
Date: Thu, 18 Mar 2010 22:29:41 +0000
Subject: should writing Unicode files be so slow
Message-ID: <hnu9gl$fg7e$1@uns-a.ucl.ac.uk>

I have a simple program to read a text (.csv) file and split it into
several smaller files. Tonight I decided to write a unicode variant and was
surprised at the difference in performance. Is there a better way?

> from __future__ import with_statement
> import codecs
> 
> def _rowreader(filename, separator='\t'):
>     """Generator for iteration over potentially large file."""
>     with codecs.open(filename, 'rU', 'utf-8', 'backslashreplace') as tabfile:  
>         for row in tabfile:
>             yield [v.strip() for v in row.split(separator)]  
> 
> def generator_of_output(source_of_lines):
>     for line in source_of_lines:
>         for result in some_function(line):
>             yield result
> 
> def coroutine(outfile_prefix, outfile_suffix, sep='\t'):
>     outfile = '%s_%s.txt'%  (outfile_prefix, outfile_suffix)
>     with codecs.open(outfile, 'w', 'utf-8') as out_part:
>         while True:
>             line = (yield)
>             out_part.write(sep.join(line) + '\n')
> 
> def _file_to_files(infile, outfile_prefix, column, sep):
>     column_values = dict()
>     for line in _rowreader(infile, sep):
>         outfile_suffix = line[column].strip('\'\"')
>         if  outfile_suffix  in  column_values:
>             column_values[outfile_suffix].send(line)
>         else:
>             file_writer = coroutine(outfile_prefix, outfile_suffix, sep)
>             file_writer.next()
>             file_writer.send(line)
>             column_values[outfile_suffix] = file_writer
>     for file_writer in column_values.itervalues():
>         file_writer.close()    

the plain version is the same except for
>     with open(filename, 'rU') as tabfile:
>     with open(outfile, 'wt') as out_part:


The difference:
> "uid","timestamp","taskid","inputid","value"
> "15473178739336026589","2010-02-18T20:50:15+0000","11696870405","73827093507","83523277829"
> "15473178739336026589","2010-02-18T20:50:15+0000","11696870405","11800677379","12192844803"
> "15473178739336026589","2010-02-18T20:50:15+0000","11696870405","31231839235","52725552133"
> 
> sysweb at Bembo:~/UCLC/bbc/wb2$ wc -l wb.csv
> 9293271 wb.csv
> 
> normal version
> sysweb at Bembo:~/UCLC$ time ~/UCL/toolkit/file_splitter.py -o tt --separator comma -k 2 wb.csv
> 
> real	0m43.714s
> user	0m37.370s
> sys	0m2.732s
> 
> unicode version
> sysweb at Bembo:~/UCLC$ time ./file_splitter.py -o t --separator comma -k 2 wb.csv
> 
> real	4m8.695s
> user	3m19.236s
> sys	0m39.262s



-- 
David Clark, MSc, PhD.              UCL Centre for Publishing
                                    Gower Str London WCIE 6BT
What sort of web animal are you?
            <https://www.bbc.co.uk/labuk/experiments/webbehaviour>


From davea at ieee.org  Thu Mar 18 19:13:59 2010
From: davea at ieee.org (Dave Angel)
Date: Thu, 18 Mar 2010 18:13:59 -0500
Subject: Python bindings tutorial
In-Reply-To: <hnqgdr$prr$1@news.eternal-september.org>
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>	<mailman.863.1268766752.23598.python-list@python.org>	<98447f7e-64db-4a10-b19e-685f5b079cf6@l25g2000yqd.googlegroups.com>	<hnq7qt$kl0$1@dough.gmane.org>	<mailman.898.1268824466.23598.python-list@python.org>
	<hnqgdr$prr$1@news.eternal-september.org>
Message-ID: <4BA2B3B7.70309@ieee.org>

Alf P. Steinbach wrote:
> * Dave Angel:
>> Stefan Behnel wrote:
>>> <div class="moz-text-flowed" style="font-family: 
>>> -moz-fixed">MikeLisanke at gmail.com, 17.03.2010 10:08:
>>>> Its interesting you've mentioned the hard work involved in this
>>>> interface (binding to an EXE instead of a DLL). A year or more ago I
>>>> was looking at interfacing IPMITOOL to python. Do to the problems
>>>> incurred with swig/python I switched to a running the process through
>>>> its command-line interface. I always felt the problems in interfacing
>>>> python to an EXE should be worked on (to minimize them), making the
>>>> direct use of an EXE API's a routine task. I understand some of the
>>>> problems using an EXE (not running all of its startup code   but
>>>> enough for its proper operation). Have you found this a recurring
>>>> question? Thanks.
>>>
>>> I think the point here is that executable binaries are not supposed 
>>> to be used as libraries. Libraries are. That's the difference 
>>> between a DLL and an executable in the first place. To run an 
>>> executable, execute it. The subprocess module is the tool of choice 
>>> here. To use a DLL, link against it.
>>>
>>> Stefan
>>>
>> There's no real reason parts of an exe cannot be exported, same as a 
>> dll.  They are in fact the same structure.  And in fact many other 
>> files in the Windows environment are also the same structure, from 
>> fonts to ocx's
>>
>> Saying they're "not supposed to be used" is like saying that a python 
>> module should not have an
>>
>> if __name__ == "__main__":
>>
>> section.  After all, who could want to both run a file, and import 
>> the same file??
>
> A Windows DLL has defined initialization and cleanup per process and 
> per thread.
>
> This means that e.g. static variables can be properly initialized when 
> you load the DLL in order to use its functions (I'm skipping 
> discussion of subtle problems, but that's the essence).
>
> A Windows EXE has (only) a single entry point which is for process 
> startup. It invokes the EXE's behavior-as-a-program. There is no way 
> to use it to e.g. initialize static variables in order to use exported 
> functions.
>
> Hence Mike Lisanke's idea of "not running all of its startup code but 
> enough for its proper operation" is generally not possible.
>
> An EXE can be used as a kind of server, /if/ it is designed for that. 
> In particular it can be a COM server, allowing access of its 
> functionality from any COM-enabled binding, which for Python would 
> mean OLE Automation (COM, OLE, Automation: this is Microsoft 
> technology, we're talking Windows EXEs here). But a Python binding to 
> EXEs in general can't, as far as I can see, make assumptions about any 
> particular kind of server being implemented by the EXE.
>
>
> Cheers & hth.,
>
> - Alf
>
>
I'm not talking about COM servers, which run in a separate process.  
Only about calling functionality that happens to be encoded in an .EXE file.

You're trying to generalize what I said.  I never said you could call 
into any .EXE file, just that calling into one is not infeasible.  
You're describing using an .EXE written using the Microsoft C compiler 
and/or libraries, not a Windows .EXE in general.  In any case, whenever 
you link to a module written in a different environment, you'll have 
restrictions.  Chief among them is the use of a compatible memory model, 
the stack conventions, the allocators, and so on..  Solving the thread 
issue is probably the easiest one to fix.

I'm not recommending it, just refuting the "not supposed to" quote above.

DaveA



From alfps at start.no  Thu Mar 18 19:56:35 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Fri, 19 Mar 2010 00:56:35 +0100
Subject: Python bindings tutorial
In-Reply-To: <mailman.961.1268954057.23598.python-list@python.org>
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>	<mailman.863.1268766752.23598.python-list@python.org>	<98447f7e-64db-4a10-b19e-685f5b079cf6@l25g2000yqd.googlegroups.com>	<hnq7qt$kl0$1@dough.gmane.org>	<mailman.898.1268824466.23598.python-list@python.org>	<hnqgdr$prr$1@news.eternal-september.org>
	<mailman.961.1268954057.23598.python-list@python.org>
Message-ID: <hnuejm$d6a$1@news.eternal-september.org>

* Dave Angel:
> Alf P. Steinbach wrote:
>> * Dave Angel:
>>> Stefan Behnel wrote:
>>>> <div class="moz-text-flowed" style="font-family: 
>>>> -moz-fixed">MikeLisanke at gmail.com, 17.03.2010 10:08:
>>>>> Its interesting you've mentioned the hard work involved in this
>>>>> interface (binding to an EXE instead of a DLL). A year or more ago I
>>>>> was looking at interfacing IPMITOOL to python. Do to the problems
>>>>> incurred with swig/python I switched to a running the process through
>>>>> its command-line interface. I always felt the problems in interfacing
>>>>> python to an EXE should be worked on (to minimize them), making the
>>>>> direct use of an EXE API's a routine task. I understand some of the
>>>>> problems using an EXE (not running all of its startup code   but
>>>>> enough for its proper operation). Have you found this a recurring
>>>>> question? Thanks.
>>>>
>>>> I think the point here is that executable binaries are not supposed 
>>>> to be used as libraries. Libraries are. That's the difference 
>>>> between a DLL and an executable in the first place. To run an 
>>>> executable, execute it. The subprocess module is the tool of choice 
>>>> here. To use a DLL, link against it.
>>>>
>>>> Stefan
>>>>
>>> There's no real reason parts of an exe cannot be exported, same as a 
>>> dll.  They are in fact the same structure.  And in fact many other 
>>> files in the Windows environment are also the same structure, from 
>>> fonts to ocx's
>>>
>>> Saying they're "not supposed to be used" is like saying that a python 
>>> module should not have an
>>>
>>> if __name__ == "__main__":
>>>
>>> section.  After all, who could want to both run a file, and import 
>>> the same file??
>>
>> A Windows DLL has defined initialization and cleanup per process and 
>> per thread.
>>
>> This means that e.g. static variables can be properly initialized when 
>> you load the DLL in order to use its functions (I'm skipping 
>> discussion of subtle problems, but that's the essence).
>>
>> A Windows EXE has (only) a single entry point which is for process 
>> startup. It invokes the EXE's behavior-as-a-program. There is no way 
>> to use it to e.g. initialize static variables in order to use exported 
>> functions.
>>
>> Hence Mike Lisanke's idea of "not running all of its startup code but 
>> enough for its proper operation" is generally not possible.
>>
>> An EXE can be used as a kind of server, /if/ it is designed for that. 
>> In particular it can be a COM server, allowing access of its 
>> functionality from any COM-enabled binding, which for Python would 
>> mean OLE Automation (COM, OLE, Automation: this is Microsoft 
>> technology, we're talking Windows EXEs here). But a Python binding to 
>> EXEs in general can't, as far as I can see, make assumptions about any 
>> particular kind of server being implemented by the EXE.
>>
> I'm not talking about COM servers, which run in a separate process.  
> Only about calling functionality that happens to be encoded in an .EXE 
> file.
> 
> You're trying to generalize what I said.  I never said you could call 
> into any .EXE file, just that calling into one is not infeasible.

Well, true. And I'm sorry if my reply sounded as a misrepresentation. I haven't 
tried this calling-a-function-in-an-exe (since 16-bit Windows, that is!, but 
that was very different), but I can imagine two such cases:

   (1) a function f is exported by the EXE, and f doesn't depend on anything
       but its arguments and does not use any static storage, or

   (2) a DLL loaded by the EXE calls back into the EXE, which could work
       because then everything's initialized (however, there are better ways).

But these are very special cases where one really has to know what one is doing.

As Gabriel Genellina wrote up-thread, "you *could* do that if you work hard 
enough, but that's not how things are usually done".

That said, in Windows the least uncommon reason to load an EXE as a DLL is, IME, 
to access resource data in the EXE. Tip for that: the module handle, casted to 
appropriate pointer type, points to the start of the loaded image (great for 
accessing e.g. version info resource). I think this is still undocumented...


> You're describing using an .EXE written using the Microsoft C compiler 
> and/or libraries, not a Windows .EXE in general.  In any case, whenever 
> you link to a module written in a different environment, you'll have 
> restrictions.  Chief among them is the use of a compatible memory model, 
> the stack conventions, the allocators, and so on..  Solving the thread 
> issue is probably the easiest one to fix.
> 
> I'm not recommending it, just refuting the "not supposed to" quote above.

Again, I'm sorry if my reply sounded as a misrepresentation.

I just tried to make the solution-constraining technical facts available, 
addressing Mike's "making the direct use of an EXE API's a routine task".

I think we're all in (violent?) agreement on this. :-)


Cheers,

- Alf


From clockworksaint at gmail.com  Thu Mar 18 20:13:32 2010
From: clockworksaint at gmail.com (Weeble)
Date: Thu, 18 Mar 2010 17:13:32 -0700 (PDT)
Subject: GC is very expensive: am I doing something wrong?
Message-ID: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>

I am loading a dictionary from a text file and constructing a trie
data structure in memory. However, it takes longer than I'm happy with
- about 12 seconds on my computer. I profiled it, came up with some
clever ideas to cut down on the work (such as by exploiting the fact
that the dictionary is sorted) and was only able to shave a small
fraction of the time off. However, then I tried calling gc.disable()
before loading the trie and it halved the running time! I was
surprised. Is that normal? I thought that the cost of garbage
collection would be in some way proportional to the amount of garbage
created, but I didn't think I was creating any: as far as I can tell
the only objects deallocated during the load are strings, which could
not be participating in cycles.

I have spent a lot of time in C#, where the standard advice is not to
mess about with the garbage collector because you'll probably just
make things worse. Does that advice apply in Python? Is it a bad idea
to call gc.disable() before loading the trie and then enable it again
afterwards? Does the fact that the garbage collector is taking so much
time indicate I'm doing something particularly bad here? Is there some
way to give the garbage collector a hint that the whole trie is going
to be long-lived and get it promoted straight to generation 2 rather
than scanning it over and over?

$ python
Python 2.6.4 (r264:75706, Dec  7 2009, 18:43:55)
[GCC 4.4.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>
$ time python -c "import
trie;t=trie.Trie();t.load(open('sowpods.txt'))"

real	0m12.523s
user	0m12.380s
sys	0m0.140s
$ time python -c "import
trie;t=trie.Trie();t.load(open('sowpods.txt'))"

real	0m12.592s
user	0m12.480s
sys	0m0.110s
$ time python -c "import gc;gc.disable();import
trie;t=trie.Trie();t.load(open('sowpods.txt'))"

real	0m6.176s
user	0m5.980s
sys	0m0.190s
$ time python -c "import gc;gc.disable();import
trie;t=trie.Trie();t.load(open('sowpods.txt'))"

real	0m6.331s
user	0m5.530s
sys	0m0.170s


=== trie.py ===

class Trie(object):
    __slots__=("root", "active")
    def __init__(self):
        self.root=[]
        self.active=False
    def insert(self, word):
        if len(word) == 0:
            self.active=True
        else:
            head = word[0]
            for ch, child in reversed(self.root):
                if ch == head:
                    child.insert(word[1:])
                    return
            child = Trie()
            self.root.append((head, child))
            child.insert(word[1:])
    def seek(self, word):
        if len(word) == 0:
            return self
        head = word[0]
        for ch, child in self.root:
            if ch == head:
                return child.seek(word[1:])
        return EMPTY_TRIE
    def load(self, file):
        for line in file:
            self.insert(line.strip().lower())
    def empty(self):
        return (not self.root) and not self.active
    def endings(self, prefix=""):
        if self.active:
            yield prefix
        for ch, child in self.root:
            for ending in child.endings(prefix+ch):
                yield ending

EMPTY_TRIE = Trie()


From contact at xavierho.com  Thu Mar 18 20:24:22 2010
From: contact at xavierho.com (Xavier Ho)
Date: Fri, 19 Mar 2010 10:24:22 +1000
Subject: GC is very expensive: am I doing something wrong?
In-Reply-To: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
Message-ID: <2d56febf1003181724t377741eem900a456d73b58cac@mail.gmail.com>

Weeble,

Try to use the full arguments of insert(i, x), instead of using list slices.
Every time you create a slice, Python copies the list into a new memory
location with the sliced copy. That's probably a big performance impact
there if done recursively.

My 2cp,
Xav


On Fri, Mar 19, 2010 at 10:13 AM, Weeble <clockworksaint at gmail.com> wrote:

> I am loading a dictionary from a text file and constructing a trie
> data structure in memory. However, it takes longer than I'm happy with
> - about 12 seconds on my computer. I profiled it, came up with some
> clever ideas to cut down on the work (such as by exploiting the fact
> that the dictionary is sorted) and was only able to shave a small
> fraction of the time off. However, then I tried calling gc.disable()
> before loading the trie and it halved the running time! I was
> surprised. Is that normal? I thought that the cost of garbage
> collection would be in some way proportional to the amount of garbage
> created, but I didn't think I was creating any: as far as I can tell
> the only objects deallocated during the load are strings, which could
> not be participating in cycles.
>
> I have spent a lot of time in C#, where the standard advice is not to
> mess about with the garbage collector because you'll probably just
> make things worse. Does that advice apply in Python? Is it a bad idea
> to call gc.disable() before loading the trie and then enable it again
> afterwards? Does the fact that the garbage collector is taking so much
> time indicate I'm doing something particularly bad here? Is there some
> way to give the garbage collector a hint that the whole trie is going
> to be long-lived and get it promoted straight to generation 2 rather
> than scanning it over and over?
>
> $ python
> Python 2.6.4 (r264:75706, Dec  7 2009, 18:43:55)
> [GCC 4.4.1] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>>
> $ time python -c "import
> trie;t=trie.Trie();t.load(open('sowpods.txt'))"
>
> real    0m12.523s
> user    0m12.380s
> sys     0m0.140s
> $ time python -c "import
> trie;t=trie.Trie();t.load(open('sowpods.txt'))"
>
> real    0m12.592s
> user    0m12.480s
> sys     0m0.110s
> $ time python -c "import gc;gc.disable();import
> trie;t=trie.Trie();t.load(open('sowpods.txt'))"
>
> real    0m6.176s
> user    0m5.980s
> sys     0m0.190s
> $ time python -c "import gc;gc.disable();import
> trie;t=trie.Trie();t.load(open('sowpods.txt'))"
>
> real    0m6.331s
> user    0m5.530s
> sys     0m0.170s
>
>
> === trie.py ===
>
> class Trie(object):
>    __slots__=("root", "active")
>    def __init__(self):
>        self.root=[]
>        self.active=False
>    def insert(self, word):
>        if len(word) == 0:
>            self.active=True
>        else:
>            head = word[0]
>            for ch, child in reversed(self.root):
>                if ch == head:
>                    child.insert(word[1:])
>                    return
>            child = Trie()
>            self.root.append((head, child))
>            child.insert(word[1:])
>    def seek(self, word):
>        if len(word) == 0:
>            return self
>        head = word[0]
>        for ch, child in self.root:
>            if ch == head:
>                return child.seek(word[1:])
>        return EMPTY_TRIE
>    def load(self, file):
>        for line in file:
>            self.insert(line.strip().lower())
>    def empty(self):
>        return (not self.root) and not self.active
>    def endings(self, prefix=""):
>        if self.active:
>            yield prefix
>        for ch, child in self.root:
>            for ending in child.endings(prefix+ch):
>                yield ending
>
> EMPTY_TRIE = Trie()
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From tjreedy at udel.edu  Thu Mar 18 20:33:40 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 18 Mar 2010 20:33:40 -0400
Subject: GC is very expensive: am I doing something wrong?
In-Reply-To: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
Message-ID: <hnugp4$qp$1@dough.gmane.org>

On 3/18/2010 8:13 PM, Weeble wrote:
>   I thought that the cost of garbage
> collection would be in some way proportional to the amount of garbage
> created, but I didn't think I was creating any: as far as I can tell
> the only objects deallocated during the load are strings, which could
> not be participating in cycles.
>
> I have spent a lot of time in C#, where the standard advice is not to
> mess about with the garbage collector because you'll probably just
> make things worse. Does that advice apply in Python? Is it a bad idea
> to call gc.disable() before loading the trie and then enable it again
> afterwards?

I believe not. It is known that certain patterns of object creation and 
destruction can lead to bad gc behavior. No one has discovered a setting 
of the internal tuning parameters for which there are no bad patterns 
and I suspect there are not any such. This does not negate Xavier's 
suggestion that a code change might also solve your problem.

tjr



From brandonc530 at gmail.com  Thu Mar 18 21:00:47 2010
From: brandonc530 at gmail.com (Brandon Conner)
Date: Thu, 18 Mar 2010 20:00:47 -0500
Subject: Truoble With A Search Script for ImageBin.org
Message-ID: <3020ae661003181800u55a5a654v7be4a524123eec65@mail.gmail.com>

Hey Pythoners,

its my first post here, yay!

I'm trying to develop a script that will return the results of a POST
request that should list all images uploaded by a user.  However, when i run
the script, i get returned the HTML of the page with the search form.  I am
wondering what am i doing incorrectly?  Is it something I'm doing or is the
imagebin server rejecting my request?

here's the code:

import urllib
import urllib2
url = 'http://imagebin.org/index.php?page=search'
values = {'search_for' : 'blah', 'field' : 'Nickname'}
data = urllib.urlencode(values)
request = urllib2.Request(url, data)
response = urllib2.urlopen(request)
page = response.read()
print page

tks, pythons great
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From ben+python at benfinney.id.au  Thu Mar 18 21:49:56 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 19 Mar 2010 12:49:56 +1100
Subject: should writing Unicode files be so slow
References: <hnu9gl$fg7e$1@uns-a.ucl.ac.uk>
Message-ID: <8739zxw057.fsf@benfinney.id.au>

djc <slais-www at ucl.ac.uk> writes:

> I have a simple program to read a text (.csv) file

Could you please:

* simplify it further: make a minimal version that demonstrates the
  difference you're seeing, without any extraneous stuff that doesn't
  appear to affect the result.

* make it complete: the code you've shown doesn't do anything except
  define some functions.

In other words: please reduce it to a complete, minimal example that we
can run to see the same behaviour you're seeing.

-- 
 \        ?If we ruin the Earth, there is no place else to go. This is |
  `\    not a disposable world, and we are not yet able to re-engineer |
_o__)                      other planets.? ?Carl Sagan, _Cosmos_, 1980 |
Ben Finney


From clp2 at rebertia.com  Thu Mar 18 22:07:05 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 18 Mar 2010 19:07:05 -0700
Subject: import antigravity
In-Reply-To: <hnslv3$jjk$2@lust.ihug.co.nz>
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
	<hnslv3$jjk$2@lust.ihug.co.nz>
Message-ID: <50697b2c1003181907x515d29bdsad5208b59420a472@mail.gmail.com>

On Thu, Mar 18, 2010 at 12:49 AM, Lawrence D'Oliveiro
<no-spam at extra.super.obfuscation> wrote:
> I see that you published my unobfuscated e-mail address on USENET for all to
> see. I obfuscated it for a reason, to keep the spammers away. I'm assuming
> this was a momentary lapse of judgement, for which I expect an apology.

My apologies to you then. In my own defense, I will say this is the
first complaint I can recall getting about unmungeing the "To:" header
when replying to someone on python-list. To ensure your address's
privacy in the future, either using a disposable address or putting a
/completely/ invalid and unrelated address in the "To:" header are
some possible options.

Regards,
Chris
--
This is one of the pitfalls of mail-news gateways I suppose.


From steve at holdenweb.com  Thu Mar 18 22:43:38 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 18 Mar 2010 22:43:38 -0400
Subject: Truoble With A Search Script for ImageBin.org
In-Reply-To: <3020ae661003181800u55a5a654v7be4a524123eec65@mail.gmail.com>
References: <3020ae661003181800u55a5a654v7be4a524123eec65@mail.gmail.com>
Message-ID: <hnuod2$ikf$1@dough.gmane.org>

Brandon Conner wrote:
> Hey Pythoners,
> 
> its my first post here, yay!
> 
> I'm trying to develop a script that will return the results of a POST
> request that should list all images uploaded by a user.  However, when i
> run the script, i get returned the HTML of the page with the search
> form.  I am wondering what am i doing incorrectly?  Is it something I'm
> doing or is the imagebin server rejecting my request?
> 
> here's the code:
> 
> import urllib
> import urllib2
> url = 'http://imagebin.org/index.php?page=search'
> values = {'search_for' : 'blah', 'field' : 'Nickname'}
> data = urllib.urlencode(values)
> request = urllib2.Request(url, data)
> response = urllib2.urlopen(request)
> page = response.read()
> print page
> 
> tks, pythons great
> 
You need to tell the browser (in an HTTP header) that what you are
sending is HTML. Try putting

print "Content-Type: text/html\n"

at the start of your script.

regards
 Steve

-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From john at castleamber.com  Thu Mar 18 22:50:51 2010
From: john at castleamber.com (John Bokma)
Date: Thu, 18 Mar 2010 20:50:51 -0600
Subject: import antigravity
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
	<hnslv3$jjk$2@lust.ihug.co.nz>
Message-ID: <87iq8tc9dg.fsf@castleamber.com>

Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> writes:

> In message <mailman.820.1268725930.23598.python-list at python.org>, Chris 
> Rebert wrote:
>
> I see that you published my unobfuscated e-mail address on USENET for all to
> see. I obfuscated it for a reason, to keep the spammers away. I'm assuming
> this was a momentary lapse of judgement, for which I expect an apology.
> Otherwise, it becomes grounds for an abuse complaint to your ISP. 

Ha ha ha! Get a life. You're using a non-existant tld. I recommend to
use .invalid instead, e.g.

ldo at geek-central.gen.nz.invalid

And Chris can make sure that his unobfuscating code doesn't run if the
tld is invalid.


-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From cs at zip.com.au  Thu Mar 18 22:57:19 2010
From: cs at zip.com.au (Cameron Simpson)
Date: Fri, 19 Mar 2010 13:57:19 +1100
Subject: Truoble With A Search Script for ImageBin.org
In-Reply-To: <hnuod2$ikf$1@dough.gmane.org>
References: <hnuod2$ikf$1@dough.gmane.org>
Message-ID: <20100319025719.GA20465@cskk.homeip.net>

On 18Mar2010 22:43, Steve Holden <steve at holdenweb.com> wrote:
| Brandon Conner wrote:
| > I'm trying to develop a script that will return the results of a POST
| > request that should list all images uploaded by a user.  However, when i
| > run the script, i get returned the HTML of the page with the search
| > form.  I am wondering what am i doing incorrectly?  Is it something I'm
| > doing or is the imagebin server rejecting my request?
| > 
| > here's the code:
| > 
| > import urllib
| > import urllib2
| > url = 'http://imagebin.org/index.php?page=search'
| > values = {'search_for' : 'blah', 'field' : 'Nickname'}
| > data = urllib.urlencode(values)
| > request = urllib2.Request(url, data)
| > response = urllib2.urlopen(request)
| > page = response.read()
| > print page
| > 
| > tks, pythons great
| > 
| You need to tell the browser (in an HTTP header) that what you are
| sending is HTML. Try putting
| 
| print "Content-Type: text/html\n"
| 
| at the start of your script.

I think it may need to be "application/x-www-form-urlencoded", not
text/html. But otherwise, yes, missing Content-Type.

And the request method needs to be POST; I expect the code above will be
using GET unless told not to.

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

There's no trick to being a humorist when you have the whole government
working for you.        - Will Rogers


From rowland at river2sea.org  Thu Mar 18 23:25:48 2010
From: rowland at river2sea.org (Rowland Smith)
Date: Thu, 18 Mar 2010 23:25:48 -0400
Subject: example of ssl with SimpleXMLRPCServer in 2.6?
Message-ID: <2010031823254816807-rowland@river2seaorg>

Anyone have an example of using the new ssl module with 
SimpleXMLRPCServer in 2.6?

Thanks,
-- 
-Rowland



From timr at probo.com  Fri Mar 19 00:13:25 2010
From: timr at probo.com (Tim Roberts)
Date: Thu, 18 Mar 2010 21:13:25 -0700
Subject: Python bindings tutorial
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>	<mailman.863.1268766752.23598.python-list@python.org>	<98447f7e-64db-4a10-b19e-685f5b079cf6@l25g2000yqd.googlegroups.com>
	<hnq7qt$kl0$1@dough.gmane.org>
	<mailman.898.1268824466.23598.python-list@python.org>
Message-ID: <iau5q5tm3dkligk85l9upii0dm14frfvrb@4ax.com>

Dave Angel <davea at ieee.org> wrote:
>>
>There's no real reason parts of an exe cannot be exported, same as a 
>dll.  They are in fact the same structure.  And in fact many other files 
>in the Windows environment are also the same structure, from fonts to ocx's

Well, there IS a fundamental difference.  EXEs and DLLs and the like do all
have the same format.  They all have a "transfer address", where execution
begins.  That's the key problem.  With a DLL, the transfer address goes to
a DllMain, where certain DLL initialization is done, preparing the other
entry points for use.  With an EXE, the transfer address goes to "main".

So, when you load an EXE as a DLL, you will be RUNNING the program.  That's
is usually not what you want.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From nagle at animats.com  Fri Mar 19 00:33:52 2010
From: nagle at animats.com (John Nagle)
Date: Thu, 18 Mar 2010 21:33:52 -0700
Subject: sqlite3, memory db and multithreading
In-Reply-To: <hnt81m$fsi$1@news.task.gda.pl>
References: <hnt81m$fsi$1@news.task.gda.pl>
Message-ID: <4ba2fa0d$0$1598$742ec2ed@news.sonic.net>

kr?lewna wrote:
> The problem is simple: I have multiple threads within one program. At 
> least 2 threads have to have access to in-memory sqlite database. It is 
> not possible to pass sqlite objects to those threads because an 
> exception is rised:
> 
> ProgrammingError: SQLite objects created in a thread can only be used in 
> that same thread.The object was created in thread id -1219066176 and 
> this is thread id -1224475792
> 
> Is there any EASY way to use this in-memory db in many threads? Creating 
> another connection is not a solution as it creates completely new db 
> instead of connecting to the existing one.

    Recognize that sqlite is for "lite" database work.  If you're running
some massively concurrent database application, you need something heavier,
like MySQL or Postgres.  "sqlite" has a simplistic locking strategy.
Locking is done by file-level locking, and you can have one UPDATE/INSERT
operations, or any numnber of SELECTs, at a time.  Lock conflicts are
handled by wait and retry, which is slow.

    The big databases are much smarter about figuring out which operations
can safely be done in parallel, do much more query optimization, and
handle high transaction volumes much better than sqlite.

    You use sqlite for configuration files, your personal databases, and
other small stuff.  You run your Web 2.0 site on MySQL or Postgres.
You run your Fortune 1000 company on Oracle.

					John Nagle


From pmaupin at gmail.com  Fri Mar 19 00:44:19 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Thu, 18 Mar 2010 21:44:19 -0700 (PDT)
Subject: GC is very expensive: am I doing something wrong?
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
Message-ID: <7a3a0709-2325-45a3-9cb5-381a7a1ff31f@t41g2000yqt.googlegroups.com>

On Mar 18, 7:13?pm, Weeble <clockworksa... at gmail.com> wrote:
> I am loading a dictionary from a text file and constructing a trie
> data structure in memory. However, it takes longer than I'm happy with
> - about 12 seconds on my computer. I profiled it, came up with some
> clever ideas to cut down on the work (such as by exploiting the fact
> that the dictionary is sorted) and was only able to shave a small
> fraction of the time off. However, then I tried calling gc.disable()
> before loading the trie and it halved the running time! I was
> surprised. Is that normal? I thought that the cost of garbage
> collection would be in some way proportional to the amount of garbage
> created, but I didn't think I was creating any: as far as I can tell
> the only objects deallocated during the load are strings, which could
> not be participating in cycles.

Well, you are creating and destroying a lot of objects in the process,
so that will provoke the garbage collector.  But you are also doing
reversing and searching, and that's slow.  Does your application
really need to be able to keep things in order like this, or do you
just want to know if a word is in the dictionary?  If you just want to
load up a dictionary and be able to see if words are in it, I would
use a dict instead of a list.
Even if you want to be able to print out the data in order, you might
consider using a dict instead of a list.  The print operation could
use one sort at the end, instead of searching all the nodes on
insertion.

You could also use a character that doesn't appear in your data as a
sentinel, and then you don't need a separate active indicator -- every
leaf node will be empty and be referred to by the sentinel character.

You are also doing a lot of recursive operations that could be done
without recursing.

Finally, do you really need to keep an additional object around for
each node in the tree?

I have modified your trie code to use a dict and a sentinel, while
keeping basically the same API.  This may or may not be the best way
to do this, depending on your other code which uses this data
structure.  It could also probably be made faster by removing the
setdefault, and not re-building objects when you need them, and even
this implementation will load faster if you disable the gc, but in any
case, this might give you some ideas about how to make your code go
faster.

Regards,
Pat


from collections import defaultdict

class TrieTop(object):
    sentinel = ' '  # Something not in the data

    def __init__(self, data=None):
        def defaultrecurse():
            return defaultdict(defaultrecurse)
        if data is None:
            data = defaultrecurse()
        self.data = data
    def insert(self, word):
        data = self.data
        for ch in word:
            data = data[ch]
        data[self.sentinel]
    def seek(self, word):
        data = self.data
        for ch in word:
            data = data.get(ch)
            if data is None:
                return EMPTY_TRIE
        return TrieTop(data)
    def load(self, file):
        for line in file:
            self.insert(line.strip().lower())
    def empty(self):
        return (not self.data)
    def endings(self, prefix=""):
        def recurse(data, prefix):
            if not data:
                yield prefix[:-1]
                return
            for ch, data in data.iteritems():
                for result in recurse(data, prefix + ch):
                    yield result
        return sorted(recurse(self.data, prefix))

EMPTY_TRIE = TrieTop()


From anand.ibmgsi at gmail.com  Fri Mar 19 02:03:21 2010
From: anand.ibmgsi at gmail.com (anand jeyahar)
Date: Fri, 19 Mar 2010 11:33:21 +0530
Subject: Bug in Python APscheduler module.
Message-ID: <1a3a139e1003182303j218f3dc8x32896e2fe2119c5f@mail.gmail.com>

Hi ,
       I looked everywhere and could find no mention of this(might be
looking in the wrong places point me please..).  the Python package Advanced
python scheduler seems to have  a bug with the unschedule func. When
passing the  function of an object it doesn't remove it from the scheduler.
but works fine with a normal function. Please find my test script attached
and guide me...


from apscheduler.scheduler import Scheduler
def test_func():
    print "test func"

class test_class():
    def test_class1(self):
        print "test class"

def main():
    sched=Scheduler()
    sched.start()
    tc=test_class()
    tc.test_class1()
    print sched.add_interval_job(test_func,minutes=1)
    print sched.add_interval_job(tc.test_class1,minutes=1)
    print sched.add_interval_job(test_func,seconds=20)
    print "jobs b4 unschedule"
    print sched.jobs
#    sched.unschedule_func(test_func)
    sched.unschedule_func(tc.test_class1)
    print "jobs after unschedule"
    print sched.jobs
    sched.shutdown()


if __name__=='__main__':
    main()
~

~

~

~
==============================================
Anand J
http://sites.google.com/a/cbcs.ac.in/students/anand
==============================================
The man who is really serious,
with the urge to find out what truth is,
has no style at all. He lives only in what is.
                 ~Bruce Lee

Love is a trade with lousy accounting policies.
                ~Aang Jie
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From tjreedy at udel.edu  Fri Mar 19 02:51:20 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 19 Mar 2010 02:51:20 -0400
Subject: Bug in Python APscheduler module.
In-Reply-To: <1a3a139e1003182303j218f3dc8x32896e2fe2119c5f@mail.gmail.com>
References: <1a3a139e1003182303j218f3dc8x32896e2fe2119c5f@mail.gmail.com>
Message-ID: <hnv6t9$j69$1@dough.gmane.org>

On 3/19/2010 2:03 AM, anand jeyahar wrote:
> Hi ,
>         I looked everywhere and could find no mention of this(might be
> looking in the wrong places point me please..).  the Python package
> Advanced python scheduler seems to have  a bug with the unschedule func.

The site for that package
http://apscheduler.nextday.fi/
has links for Getting Help and Reporting Bugs.



From alfps at start.no  Fri Mar 19 03:01:46 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Fri, 19 Mar 2010 08:01:46 +0100
Subject: Python bindings tutorial
In-Reply-To: <iau5q5tm3dkligk85l9upii0dm14frfvrb@4ax.com>
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>	<mailman.863.1268766752.23598.python-list@python.org>	<98447f7e-64db-4a10-b19e-685f5b079cf6@l25g2000yqd.googlegroups.com>
	<hnq7qt$kl0$1@dough.gmane.org>
	<mailman.898.1268824466.23598.python-list@python.org>
	<iau5q5tm3dkligk85l9upii0dm14frfvrb@4ax.com>
Message-ID: <hnv7gs$7qc$1@news.eternal-september.org>

* Tim Roberts:
> Dave Angel <davea at ieee.org> wrote:
>> There's no real reason parts of an exe cannot be exported, same as a 
>> dll.  They are in fact the same structure.  And in fact many other files 
>> in the Windows environment are also the same structure, from fonts to ocx's


This is a bit off-topic, but your explanation is incorrect in some key respects, 
so (no offense) to avoid readers getting an incorrect impression:


> Well, there IS a fundamental difference.  EXEs and DLLs and the like do all
> have the same format.  They all have a "transfer address"

Commonly called an "entry point".

This is the term you need to know about when e.g. linking object files.



>, where execution
> begins.  That's the key problem.  With a DLL, the transfer address goes to
> a DllMain, where certain DLL initialization is done, preparing the other
> entry points for use.

Right, modulo terminology: there's only one "entry point" in a PE format file.


>  With an EXE, the transfer address goes to "main".

Sorry, no, the EXE entry point goes to a routine of no arguments.

Typically, in C and C++ that's a run time library routine (e.g. with Microsoft's 
run time library mainCRTStartup or one of its cousins) which in turn calls the 
C/C++ "main", while in Pascal it runs the main program, so on.

Note that the EXE entry point is probably still incorrectly documented as 
requiring WinMain signature  --  it's the most infamous Microsoft documentation 
screw-up.


> So, when you load an EXE as a DLL, you will be RUNNING the program.

Sorry, no, that's not what happens.

The Windows API LoadLibrary(Ex) knows the difference between an EXE and a DLL.

It's documented as handling both sub-formats, and it does.


>  That's is usually not what you want.

If that had happened then it would be a problem, yes. Happily it doesn't happen. 
I've discussed the real problems else-thread.


Cheers & hth.,

- Alf


From daniele.esposti at gmail.com  Fri Mar 19 03:20:32 2010
From: daniele.esposti at gmail.com (Expo)
Date: Fri, 19 Mar 2010 00:20:32 -0700 (PDT)
Subject: sqlite3, memory db and multithreading
References: <hnt81m$fsi$1@news.task.gda.pl>
Message-ID: <155a70fb-0e4e-43a8-8e4c-0f4475573035@t20g2000yqe.googlegroups.com>

On Mar 18, 1:58?pm, kr?lewna <kr le... at ee.pl> wrote:
> The problem is simple: I have multiple threads within one program. At
> least 2 threads have to have access to in-memory sqlite database. It is
> not possible to pass sqlite objects to those threads because an
> exception is rised:
>
> ProgrammingError: SQLite objects created in a thread can only be used in
> that same thread.The object was created in thread id -1219066176 and
> this is thread id -1224475792
>
> Is there any EASY way to use this in-memory db in many threads? Creating
> another connection is not a solution as it creates completely new db
> instead of connecting to the existing one.
>

You can put the SQLite database into a Singleton class and use a
semaphore to serialize the access to methods which writes to the
database.


From dr.cg at 126.com  Fri Mar 19 03:49:28 2010
From: dr.cg at 126.com (CHEN Guang)
Date: Fri, 19 Mar 2010 15:49:28 +0800 (CST)
Subject: C++ code generation
In-Reply-To: <7f014ea61003180928q4763a819ic548364e2811952d@mail.gmail.com>
References: <7f014ea61003180928q4763a819ic548364e2811952d@mail.gmail.com>
	<24b7e9.8952.1276b803126.Coremail.dr.cg@126.com>
Message-ID: <90858a.6e02.1277565f46c.Coremail.dr.cg@126.com>

Plug? Any evidence to say that? As long as this thread concerned, is there any answer more closed to the topic "C++ code generation" than mine? 

I think Stefan was telling you, in a nice way, to stop spamming every thread about code generation with a plug for your project. 


2010/3/17 CHEN Guang <dr.cg at 126.com>

>> ----- Original Message -----
>> From: "Dan Goodman"<dg.gmane at thesamovar.net>
>>
>>> I'm doing some C++ code generation using Python, and would be interested
>>> in any comments on the approach I'm taking.
>>
>> PythoidC ( http://pythoidc.googlecode.com ) is a C code generator (not C++)
> 
> It would be nice if you could start reading the posts before you answer, 
> and then try to give an answer that fits the question.
> 
> Stefan
 
I have read the post, may be I lost some words and made you misunderstand. I meant:
PythoidC ( http://pythoidc.googlecode.com ) is a C code generator (but not C++), if you find it useful, 
welcome to take a look.



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From __peter__ at web.de  Fri Mar 19 03:56:46 2010
From: __peter__ at web.de (Peter Otten)
Date: Fri, 19 Mar 2010 08:56:46 +0100
Subject: logging: local functions ==> loss of lineno
References: <mailman.576.1268256192.23598.python-list@python.org>
	<hnaj9c$i0u$02$1@news.t-online.com>
	<mailman.959.1268946325.23598.python-list@python.org>
Message-ID: <hnvanq$goh$03$1@news.t-online.com>

Hellmut Weber wrote:

> your hack is exactly what I was looking for.
> It permits to configure my logging messages as I want, e.g. using
> different colors for different classes of messages.
> 
> I do not yet understand all details WHY it is working but suppose some
> study of the logging module will help me to understand.

Have  a look at Logger.findCaller() in logging/__init__.py. To find the 
calling function it does something like

for frame in walk_callstack():
    if filename_of(frame) == _srcfile:
        continue
    return filename_lineno_and_functionname_of(frame)

The _srcfile is normally logging/__init__.py, and it is skipped because a 
user typically is interested only in what happens outside the logging 
package.

My hack under the hood changes

filename_of(frame) == _srcfile

from a string comparison to a

filename_of(frame) in set_of_files

containment test (see SrcFile.__eq__() posted above).

Peter





From nbvfour at gmail.com  Fri Mar 19 04:05:03 2010
From: nbvfour at gmail.com (nbv4)
Date: Fri, 19 Mar 2010 01:05:03 -0700 (PDT)
Subject: installing something to a virtualenv when it's already in 
	site-packages
Message-ID: <f72d8080-6fda-4b4b-b4a6-df6f354479fc@19g2000yqu.googlegroups.com>

I have ipython installed via apt. I can go to the command line and
type 'ipython' and it will work. If I try to install ipython to a
virtualenv, I get this:

$ pip install -E env/ ipython
Requirement already satisfied: ipython in /usr/share/pyshared
Installing collected packages: ipython
Successfully installed ipython

I want ipython in both site-packages as well as in my virtualenv. This
is bad because when I activate the virtualenv, site-packages
disappears and ipython is not available. A work around is to uninstall
ipython from apt, install to the virtualenv, then reinstall in apt. Is
there a better way?


From darkrho at gmail.com  Fri Mar 19 04:26:56 2010
From: darkrho at gmail.com (Rolando Espinoza La Fuente)
Date: Fri, 19 Mar 2010 04:26:56 -0400
Subject: installing something to a virtualenv when it's already in 
	site-packages
In-Reply-To: <f72d8080-6fda-4b4b-b4a6-df6f354479fc@19g2000yqu.googlegroups.com>
References: <f72d8080-6fda-4b4b-b4a6-df6f354479fc@19g2000yqu.googlegroups.com>
Message-ID: <4eca3f41003190126mc625306m59608d638253d91c@mail.gmail.com>

On Fri, Mar 19, 2010 at 4:05 AM, nbv4 <nbvfour at gmail.com> wrote:
> I have ipython installed via apt. I can go to the command line and
> type 'ipython' and it will work. If I try to install ipython to a
> virtualenv, I get this:
>
> $ pip install -E env/ ipython
> Requirement already satisfied: ipython in /usr/share/pyshared
> Installing collected packages: ipython
> Successfully installed ipython
>
> I want ipython in both site-packages as well as in my virtualenv. This
> is bad because when I activate the virtualenv, site-packages
> disappears and ipython is not available. A work around is to uninstall
> ipython from apt, install to the virtualenv, then reinstall in apt. Is
> there a better way?

I use -U (--upgrade) to force the installation within virtualenv. e.g:

$ pip install -E env/ -U ipython

Regards,

Rolando


From pankaj.kr at gmail.com  Fri Mar 19 05:03:54 2010
From: pankaj.kr at gmail.com (Pankaj)
Date: Fri, 19 Mar 2010 02:03:54 -0700 (PDT)
Subject: exp_continue
Message-ID: <1669b997-c4bf-43fc-a2e0-3d5c99cb0524@v34g2000prm.googlegroups.com>

I am using pexpect module in python

I would like to know how I can use exp_continue here.

what is the alternative of exp_continue of perl/tcl in pexpect.


From nilly16 at yahoo.com  Fri Mar 19 05:37:35 2010
From: nilly16 at yahoo.com (Jimbo)
Date: Fri, 19 Mar 2010 02:37:35 -0700 (PDT)
Subject: Why this compile error?
Message-ID: <c5dfb9b1-1dec-4fb0-9058-5043ade52d8c@u19g2000prh.googlegroups.com>

Hello

Can you help me figure out why I am getting this compile error with my
program. The error occurs right at the bottom of my code & I have
commented where it occurs.

The error is:
[QUOTE]Expected an indented block[/QUOTE]

[CODE]"""
 *Stock Data Builder*
   Algorithm:
      - Search website for stock
      - Get website HTML source code
      - Search code for target stock data(price,dividends)
      - Add data to text file
"""

import sys

# Functions
def getSource(URL, sourceBuffer):
    """ Retrieve HTML source code from websitr URL &
        save in sourceBuffer                       """

    return sourceBuffer

def getData(targetData, dataBuffer):
    """ Searches the string dataBuffer for the occurence of target
        data & returns that whole line                            """

def writeToFile(textFile, dataBuffer):
    """ Writes data in string dataBuffer to text file """

    # CHANGE this to try except to catch errors
    fileT = open(textFile,'a')
    fileT.write(dataBuffer)
    return True; # function succeeded

def writeToFile(textFile, dataList):
    """ Writes data in List dataList to text file """

    # CHANGE this to try except to catch errors
    fileT = open(textFile,'a')

    for element in dataList:
        fileT.write(element)
    return True; # function succeeded



# Main program loop
def main():
    programEnd = False;

    while (programEnd == False):
        #ERROR HERE?? - Error="Expected an indented block"
main()[/CODE]


From bruno.42.desthuilliers at websiteburo.invalid  Fri Mar 19 06:04:11 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 19 Mar 2010 11:04:11 +0100
Subject: Why this compile error?
In-Reply-To: <c5dfb9b1-1dec-4fb0-9058-5043ade52d8c@u19g2000prh.googlegroups.com>
References: <c5dfb9b1-1dec-4fb0-9058-5043ade52d8c@u19g2000prh.googlegroups.com>
Message-ID: <4ba34c10$0$29759$426a74cc@news.free.fr>

Jimbo a ?crit :
> Hello
> 
> Can you help me figure out why I am getting this compile error with my
> program. The error occurs right at the bottom of my code & I have
> commented where it occurs.
> 
> The error is:
> [QUOTE]Expected an indented block[/QUOTE]
> 
> [CODE]
(snip)
> # Main program loop
> def main():
>     programEnd = False;
> 
>     while (programEnd == False):
>         #ERROR HERE?? - Error="Expected an indented block"

Indeed. You *need* a stamement in the while block. If you want a noop, 
then use the 'pass' statement:

      while programEnd == False:
          pass


But note that as-is, this will go into an infinite loop.


From eckhardt at satorlaser.com  Fri Mar 19 06:11:18 2010
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Fri, 19 Mar 2010 11:11:18 +0100
Subject: Why this compile error?
References: <c5dfb9b1-1dec-4fb0-9058-5043ade52d8c@u19g2000prh.googlegroups.com>
Message-ID: <67vb77-sb6.ln1@satorlaser.homedns.org>

Jimbo wrote:
> Can you help me figure out why I am getting this compile error with my
> program. The error occurs right at the bottom of my code & I have
> commented where it occurs.
[...]
> def main():
>     programEnd = False;
> 
>     while (programEnd == False):
>         #ERROR HERE?? - Error="Expected an indented block"
> main()[/CODE]

Was the comment there before or not? In any case, I believe a comment
doesn't qualify as indented block, if you want to leave the block empty
use 'pass' instead. Also, make sure you don't mix tabs and spaces, which is
also a popular way to confuse Python.

BTW: "while" doesn't need brackets, that's a C-ism. ;)

Cheers!

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From jeanmichel at sequans.com  Fri Mar 19 06:39:57 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 19 Mar 2010 11:39:57 +0100
Subject: logging: local functions ==> loss of lineno
In-Reply-To: <4BA295A1.70207@hellmutweber.de>
References: <mailman.576.1268256192.23598.python-list@python.org>	<hnaj9c$i0u$02$1@news.t-online.com>
	<4BA295A1.70207@hellmutweber.de>
Message-ID: <4BA3547D.7080107@sequans.com>

Hellmut Weber wrote:
> Am 11.03.2010 12:14, schrieb Peter Otten:
>> Hellmut Weber wrote:
>>
>>> Logging works very well giving the filename and line number of the 
>>> point
>>> where it is called. As long as I use the loggers directly.
>>> BUT when I have to wrap the logger call in some other function, I 
>>> always
>>> get file name and line number of the call of the logger inside the
>>> wrapping function.
>>>
>>> Is there a possibility to get this information in this situation too?
>>
>> The official way is probably to write a custom Logger class that 
>> overrides
>> the findCaller() method.
>>
>> Below is a hack that monkey-patches the logging._srcfile attribute to 
>> ignore
>> user-specified modules in the call stack:
>>
>> $ cat wrapper.py
>> import logging
>> import os
>> import sys
>>
>> logger = logging.getLogger()
>>
>> class SrcFile(object):
>>      def __init__(self, exclude_files):
>>          self.files = set(exclude_files)
>>      def __eq__(self, other):
>>          return other in self.files
>>
>> def fixname(filename):
>>      if filename.lower().endswith((".pyc", ".pyo")):
>>          filename = filename[:-4] + ".py"
>>      return os.path.normcase(filename)
>>
>> if "--monkey" in sys.argv:
>>      print "patching"
>>      logging._srcfile = SrcFile([logging._srcfile, fixname(__file__)])
>>
>> def warn(*args, **kw):
>>      logger.warn(*args, **kw)
>>
>> $ cat main.py
>> import logging
>> logging.basicConfig(format="%(filename)s<%(lineno)s>: %(message)s")
>> import wrapper
>> wrapper.warn("foo")
>> wrapper.warn("bar")
>> wrapper.warn("baz")
>>
>> $ python main.py
>> wrapper.py<23>: foo
>> wrapper.py<23>: bar
>> wrapper.py<23>: baz
>>
>> $ python main.py --monkey
>> patching
>> main.py<4>: foo
>> main.py<5>: bar
>> main.py<6>: baz
>>
>> $ python -V
>> Python 2.6.4
>>
>> Peter
>
> Hi Peter,
> your hack is exactly what I was looking for.
> It permits to configure my logging messages as I want, e.g. using 
> different colors for different classes of messages.
>
> I do not yet understand all details WHY it is working but suppose some 
> study of the logging module will help me to understand.
>
> Thank you very much
>
_scrFile is a private attribute of the logging module. Don't change it.

As you said yourself, 'The official way is probably to write a custom 
Logger class that overrides
the findCaller() method'

JM



From peter_peyman_puk at yahoo.ca  Fri Mar 19 06:47:53 2010
From: peter_peyman_puk at yahoo.ca (Peyman Askari)
Date: Fri, 19 Mar 2010 03:47:53 -0700 (PDT)
Subject: Importing modules
Message-ID: <180153.53663.qm@web43402.mail.sp1.yahoo.com>

I want to write a function which imports modules the first time, and reloads them afterwards, but I am running into problems with global variables and exec. I will include a full script, but let me elaborate first.

Essentially what you need is

def import_or_reload():
?"""assume we want to load or reload sys"""
?if 'sys' in dir():
? reload(sys)
else: 
? import sys

but this runs into the problem that sys is imported within the local scope of the function, so you insert a global statement



def import_or_reload2():

?"""Add 'global sys'"""
?global sys

?if 'sys' in dir():

? reload(sys)

else: 

? import sys

'sys' is still not in dir() as dir() pertains to the local scope of the function, but one can get around this by creating a local modules list and adding the imported modules to it





def import_or_reload3():


?"""Add 'global modules'"""

?global sys
?global modules



?if 'sys' in modules:


? reload(sys)


else: 


? import sys
? modules.append('sys')

now lets add a parameter to the function signature, so any module name can be passed as an argument and loaded





def import_or_reload4(module_name):



?"""Add exec"""
?

exec 'global %s'%module_name

?global modules





?if module_name in modules:



? exec 'reload(%s)'%module_name



else: 



? exec 'import %s'%module_name

? exec 'modules.append(\'%s\')'%module_name

but this doesn't work as global does not cooperate with exec
is there a __reload__('X') function like there is an __import__(?X?) function? 

Also is there a better way to import modules at run time?

Cheers and here is the test script in case you can't access the attachment

def a():
??? global modules
??? global sys
??? import sys

??? modules.append('sys')

def b():
??? global modules
??? global sys

??? reload(sys)

def c(module_name):
??? global modules
??? exec 'global %s'%module_name
??? exec 'import %s'%module_name

??? modules.append(module_name)

def test():
??? global modules
??? global sys

??? #create the module list to contain all the modules
??? modules=[]

??? print 'originally dir() returns:'
??? print dir()

??? a()
??? print 'function a() properly imports the following module:'
??? print sys
??? print 'is %s in %s->%s'%('sys',modules,'sys' in modules)
??? 
??? b()
??? print 'function b() properly reloads the following module:'
??? print sys
??? print 'is %s still in %s->%s'%('sys',modules,'sys' in modules)

??? try:
??? ??? c('os')
??? ??? print 'function c() properly imports the following module:'
??? except:
??? ??? print 'function c() failed to import module os'
??? ??? print 'is %s in %s->%s'%('os',modules,'os' in modules)

??? try:
??? ??? print os
??? ??? print 'is %s still in %s->%s'%('os',modules,'os' in modules)
??? except:
??? ??? print 'os was loaded, but is not visible outside of the scope of c()'
--- On Fri, 3/19/10, python-list-request at python.org <python-list-request at python.org> wrote:

From: python-list-request at python.org <python-list-request at python.org>
Subject: Python-list Digest, Vol 78, Issue 192
To: python-list at python.org
Received: Friday, March 19, 2010, 7:05 AM

Send Python-list mailing list submissions to
??? python-list at python.org

To subscribe or unsubscribe via the World Wide Web, visit
??? http://mail.python.org/mailman/listinfo/python-list
or, via email, send a message with subject or body 'help' to
??? python-list-request at python.org

You can reach the person managing the list at
??? python-list-owner at python.org

When replying, please edit your Subject line so it is more specific
than "Re: Contents of Python-list digest..."
Today's Topics:

???1. Re: import antigravity (John Bokma)
???2. Re: Truoble With A Search Script for ImageBin.org
? ? ? (Cameron Simpson)
???3. example of ssl with SimpleXMLRPCServer in 2.6? (Rowland Smith)
???4. Re: multiprocessing on freebsd (Tim Arnold)
???5. Re: Python bindings tutorial (Tim Roberts)
???6. Re: sqlite3, memory db and multithreading (John Nagle)
???7. Re: GC is very expensive: am I doing something wrong?
? ? ? (Patrick Maupin)
???8. Bug in Python APscheduler module. (anand jeyahar)
???9. Re: Bug in Python APscheduler module. (Terry Reedy)
? 10. Re: Python bindings tutorial (Alf P. Steinbach)
-- 
http://mail.python.org/mailman/listinfo/python-list


      __________________________________________________________________
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From królewna at ee.pl  Fri Mar 19 06:55:57 2010
From: królewna at ee.pl (=?ISO-8859-1?Q?kr=F3lewna?=)
Date: Fri, 19 Mar 2010 11:55:57 +0100
Subject: sqlite3, memory db and multithreading
In-Reply-To: <57dc1ce8-1ac7-4d72-aafc-6fe7920144c2@c16g2000yqd.googlegroups.com>
References: <hnt81m$fsi$1@news.task.gda.pl>
	<57dc1ce8-1ac7-4d72-aafc-6fe7920144c2@c16g2000yqd.googlegroups.com>
Message-ID: <hnvl7s$lsv$1@news.task.gda.pl>

W dniu 18.03.2010 15:49, DreiJane pisze:

> Principally sqlite connections (sqlite3 objects in the C-API) can be
> used over multiple threads - and connections to :memory: make no
> difference. There are additional parameters to open() giving fine-
> tuned control. And apsw is promising a true reflection of sqlite's C-
> API.

It's my fault not saying what am I using to connect to sqlite db. It's 
sqlite3 module. So there is no open() function etc. As for now I'm not 
interested in rewriting my program to use apsw so is there any possible 
way of working this out with sqlite3?

--
best regards
princess



From królewna at ee.pl  Fri Mar 19 06:56:54 2010
From: królewna at ee.pl (=?UTF-8?B?a3LDs2xld25h?=)
Date: Fri, 19 Mar 2010 11:56:54 +0100
Subject: sqlite3, memory db and multithreading
In-Reply-To: <hnu848$oo7$1@panix5.panix.com>
References: <hnt81m$fsi$1@news.task.gda.pl> <hnu848$oo7$1@panix5.panix.com>
Message-ID: <hnvl9l$lsv$2@news.task.gda.pl>

W dniu 18.03.2010 23:06, Aahz pisze:
>
> You probably need to serialize access to the database through one thread.

sqlite3 objects are not pickable so it's not proper way.

--
best regards
princess



From królewna at ee.pl  Fri Mar 19 07:04:16 2010
From: królewna at ee.pl (=?ISO-8859-1?Q?kr=F3lewna?=)
Date: Fri, 19 Mar 2010 12:04:16 +0100
Subject: sqlite3, memory db and multithreading
In-Reply-To: <155a70fb-0e4e-43a8-8e4c-0f4475573035@t20g2000yqe.googlegroups.com>
References: <hnt81m$fsi$1@news.task.gda.pl>
	<155a70fb-0e4e-43a8-8e4c-0f4475573035@t20g2000yqe.googlegroups.com>
Message-ID: <hnvlne$njq$1@news.task.gda.pl>

W dniu 19.03.2010 08:20, Expo pisze:
>
> You can put the SQLite database into a Singleton class and use a
> semaphore to serialize the access to methods which writes to the
> database.

I've tried this out but doesnt work. Still gives an error like:

ProgrammingError: SQLite objects created in a thread can only be used in 
that same thread.The object was created in thread id -1216280896 and 
this is thread id -1217107088

--
best regards
princess



From mail at timgolden.me.uk  Fri Mar 19 07:10:29 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 19 Mar 2010 11:10:29 +0000
Subject: sqlite3, memory db and multithreading
In-Reply-To: <hnvl9l$lsv$2@news.task.gda.pl>
References: <hnt81m$fsi$1@news.task.gda.pl> <hnu848$oo7$1@panix5.panix.com>
	<hnvl9l$lsv$2@news.task.gda.pl>
Message-ID: <4BA35BA5.5020805@timgolden.me.uk>

On 19/03/2010 10:56, kr?lewna wrote:
> W dniu 18.03.2010 23:06, Aahz pisze:
>>
>> You probably need to serialize access to the database through one thread.
>
> sqlite3 objects are not pickable so it's not proper way.

Is it possible you've misunderstood the meaning of the word "serialize"
here? What's being suggested isn't serialising (ie marshalling, pickling)
the data; rather, serialising the *access*, ie pushing all db requests into
a queue which is read by one thread which manages the only db connection.

TJG


From królewna at ee.pl  Fri Mar 19 07:24:11 2010
From: królewna at ee.pl (=?ISO-8859-1?Q?kr=F3lewna?=)
Date: Fri, 19 Mar 2010 12:24:11 +0100
Subject: sqlite3, memory db and multithreading
In-Reply-To: <mailman.974.1268997041.23598.python-list@python.org>
References: <hnt81m$fsi$1@news.task.gda.pl>
	<hnu848$oo7$1@panix5.panix.com>	<hnvl9l$lsv$2@news.task.gda.pl>
	<mailman.974.1268997041.23598.python-list@python.org>
Message-ID: <hnvmsp$rln$1@news.task.gda.pl>

W dniu 19.03.2010 12:10, Tim Golden pisze:
> Is it possible you've misunderstood the meaning of the word "serialize"
> here?
It's not possible, it just happened :)

> What's being suggested isn't serialising (ie marshalling, pickling)
> the data; rather, serialising the *access*, ie pushing all db requests into
> a queue which is read by one thread which manages the only db connection.

That would make structure of program much more complicated. I would have 
to create queue for putting there queries and some other extra 
variables/structure to receive output from db and some more for 
controlling the execution flow of awaiting threads.
--
best regards
princess



From kamil at lucem.pl  Fri Mar 19 07:48:17 2010
From: kamil at lucem.pl (Kamil Wasilewski)
Date: Fri, 19 Mar 2010 12:48:17 +0100
Subject: python-daemon PID file
Message-ID: <eeca458e1003190448p6f7d1900p47dbc0ecf0e9f588@mail.gmail.com>

Hi all,

Im trying to get a daemon up and running but have been tripping on every
stone along the way, this last one however i cant manage to get by.
versions:
Python 2.5.2
python-daemon-1.5.5
Debian Linux 2.6.26-2-686

Some of the problems ive run into:

import daemon
with daemon.DaemonContext():
    do_main_program()

doesnt work on my version of Python 2.5.2 so im using

import daemon
import grp
import pwd

diablo.uid = pwd.getpwnam('nobody').pw_uid
diablo.gid = grp.getgrnam('nogroup').gr_gid

daemon.__enter__()
main()
daemon.__exit__()

Next I had problems with Initd starting the daemon because i forgot to chmod
it to 755.

The final problem is with the PID file and getting a correct PID written.
Initially there was no file being created, so i thought i needed the
--make-pidfile option in start-stop-daemon, but ive since learned that the
daemon should create and edit the file, not s-s-d as it inserts the PID of
the parent process, which is not the correct PID of the final daemon.

So i added to my daemon:

import lockfile
daemon.DaemonContext(pidfile=lockfile.FileLock('/var/run/mydaemon.pid'),)


which didnt start the daemon at all as i created the pid file as root, and
was setting the Daemon to run as nobody,nogroup so it was dieing silently.
Im running it as root for now to see if i can get a correct pid in the pid
file.
However no PID file is created, and if i create one its not populated with a
PID.

In summary: I cant get a PID file created or pupulated with a PID by
python-daemon.
Anyone see something that im doing wrong? ive been sitting on this way too
long. I looked at the python-daemon source and i cant see where the pid is
inserted into the pid file, only where it __enter__'s the lockfile so is
this missing?
Thanks!
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From slais-www at ucl.ac.uk  Fri Mar 19 08:08:19 2010
From: slais-www at ucl.ac.uk (djc)
Date: Fri, 19 Mar 2010 12:08:19 +0000
Subject: should writing Unicode files be so slow
In-Reply-To: <8739zxw057.fsf@benfinney.id.au>
References: <hnu9gl$fg7e$1@uns-a.ucl.ac.uk> <8739zxw057.fsf@benfinney.id.au>
Message-ID: <hnvpfj$7k76$1@uns-a.ucl.ac.uk>

Ben Finney wrote:
> djc <slais-www at ucl.ac.uk> writes:
> 
>> I have a simple program to read a text (.csv) file
> 
> Could you please:
> 
> * simplify it further: make a minimal version that demonstrates the
>   difference you're seeing, without any extraneous stuff that doesn't
>   appear to affect the result.
> 
> * make it complete: the code you've shown doesn't do anything except
>   define some functions.
> 
> In other words: please reduce it to a complete, minimal example that we
> can run to see the same behaviour you're seeing.
> 


It is the minimal example. The only thing omited is the opt.parse code that
 calls _file_to_files(infile, outfile_prefix, column, sep):


-- 
David Clark, MSc, PhD.              UCL Centre for Publishing
                                    Gower Str London WCIE 6BT
What sort of web animal are you?
            <https://www.bbc.co.uk/labuk/experiments/webbehaviour>


From __peter__ at web.de  Fri Mar 19 08:24:41 2010
From: __peter__ at web.de (Peter Otten)
Date: Fri, 19 Mar 2010 13:24:41 +0100
Subject: logging: local functions ==> loss of lineno
References: <mailman.576.1268256192.23598.python-list@python.org>
	<hnaj9c$i0u$02$1@news.t-online.com>
	<4BA295A1.70207@hellmutweber.de>
	<mailman.972.1268995215.23598.python-list@python.org>
Message-ID: <hnvqe5$vc$02$1@news.t-online.com>

Jean-Michel Pichavant wrote:

> Hellmut Weber wrote:
>> Am 11.03.2010 12:14, schrieb Peter Otten:
>>> Hellmut Weber wrote:
>>>
>>>> Logging works very well giving the filename and line number of the
>>>> point
>>>> where it is called. As long as I use the loggers directly.
>>>> BUT when I have to wrap the logger call in some other function, I
>>>> always
>>>> get file name and line number of the call of the logger inside the
>>>> wrapping function.
>>>>
>>>> Is there a possibility to get this information in this situation too?
>>>
>>> The official way is probably to write a custom Logger class that
>>> overrides
>>> the findCaller() method.
>>>
>>> Below is a hack that monkey-patches the logging._srcfile attribute to
>>> ignore
>>> user-specified modules in the call stack:
>>>
>>> $ cat wrapper.py
>>> import logging
>>> import os
>>> import sys
>>>
>>> logger = logging.getLogger()
>>>
>>> class SrcFile(object):
>>>      def __init__(self, exclude_files):
>>>          self.files = set(exclude_files)
>>>      def __eq__(self, other):
>>>          return other in self.files
>>>
>>> def fixname(filename):
>>>      if filename.lower().endswith((".pyc", ".pyo")):
>>>          filename = filename[:-4] + ".py"
>>>      return os.path.normcase(filename)
>>>
>>> if "--monkey" in sys.argv:
>>>      print "patching"
>>>      logging._srcfile = SrcFile([logging._srcfile, fixname(__file__)])
>>>
>>> def warn(*args, **kw):
>>>      logger.warn(*args, **kw)
>>>
>>> $ cat main.py
>>> import logging
>>> logging.basicConfig(format="%(filename)s<%(lineno)s>: %(message)s")
>>> import wrapper
>>> wrapper.warn("foo")
>>> wrapper.warn("bar")
>>> wrapper.warn("baz")
>>>
>>> $ python main.py
>>> wrapper.py<23>: foo
>>> wrapper.py<23>: bar
>>> wrapper.py<23>: baz
>>>
>>> $ python main.py --monkey
>>> patching
>>> main.py<4>: foo
>>> main.py<5>: bar
>>> main.py<6>: baz
>>>
>>> $ python -V
>>> Python 2.6.4
>>>
>>> Peter
>>
>> Hi Peter,
>> your hack is exactly what I was looking for.
>> It permits to configure my logging messages as I want, e.g. using
>> different colors for different classes of messages.
>>
>> I do not yet understand all details WHY it is working but suppose some
>> study of the logging module will help me to understand.
>>
>> Thank you very much
>>
> _scrFile is a private attribute of the logging module. Don't change it.
> 
> As you said yourself, 'The official way is probably to write a custom
> Logger class that overrides
> the findCaller() method'

OK, I tried the this approach, too:

import logging
import os
import sys

from logging import currentframe

def fixname(filename):
    if filename.lower().endswith((".pyc", ".pyo")):
        filename = filename[:-4] + ".py"
    return os.path.normcase(filename)

class MyLogger(logging.Logger):
    exclude_files = set([logging._srcfile, fixname(__file__)])

    def findCaller(self):
        """
        Find the stack frame of the caller so that we can note the source
        file name, line number and function name.
        """
        f = currentframe()
        #On some versions of IronPython, currentframe() returns None if
        #IronPython isn't run with -X:Frames.
        if f is not None:
            f = f.f_back
        rv = "(unknown file)", 0, "(unknown function)"
        while hasattr(f, "f_code"):
            co = f.f_code
            filename = os.path.normcase(co.co_filename)
            if filename in self.exclude_files:
                f = f.f_back
                continue
            rv = (filename, f.f_lineno, co.co_name)
            break
        return rv

if "--custom-logger" in sys.argv:
    print "setting custom logger"
    logging.setLoggerClass(MyLogger)
    logging.root = MyLogger("root", logging.WARNING)

logger = logging.getLogger()
def warn(*args, **kw):
    logger.warn(*args, **kw)

I had to duplicate the original findCaller() method with only one line 
changed. This means I have now some code duplication and I still have to 
monitor future changes in the logging source.

In this case the "official way" seems to be more intrusive than the "hack".

Peter


From davea at ieee.org  Fri Mar 19 08:25:15 2010
From: davea at ieee.org (Dave Angel)
Date: Fri, 19 Mar 2010 07:25:15 -0500
Subject: Importing modules
In-Reply-To: <180153.53663.qm@web43402.mail.sp1.yahoo.com>
References: <180153.53663.qm@web43402.mail.sp1.yahoo.com>
Message-ID: <4BA36D2B.2000507@ieee.org>



Peyman Askari wrote:
> I want to write a function which imports modules the first time, and reloads them afterwards, but I am running into problems with global variables and exec. I will include a full script, but let me elaborate first.
>
> Essentially what you need is
>
> def import_or_reload():
>  """assume we want to load or reload sys"""
>  if 'sys' in dir():
>   reload(sys)
> else: 
>   import sys
>
> but this runs into the problem that sys is imported within the local scope of the function, so you insert a global statement
>
>
>
> def import_or_reload2():
>
>  """Add 'global sys'"""
>  global sys
>
>  if 'sys' in dir():
>
>   reload(sys)
>
> else: 
>
>   import sys
>
> 'sys' is still not in dir() as dir() pertains to the local scope of the function, but one can get around this by creating a local modules list and adding the imported modules to it
>
>
>
>
>
> def import_or_reload3():
>
>
>  """Add 'global modules'"""
>
>  global sys
>  global modules
>
>
>
>  if 'sys' in modules:
>
>
>   reload(sys)
>
>
> else: 
>
>
>   import sys
>   modules.append('sys')
>
> now lets add a parameter to the function signature, so any module name can be passed as an argument and loaded
>
>
>
>
>
> def import_or_reload4(module_name):
>
>
>
>  """Add exec"""
>  
>
> exec 'global %s'%module_name
>
>  global modules
>
>
>
>
>
>  if module_name in modules:
>
>
>
>   exec 'reload(%s)'%module_name
>
>
>
> else: 
>
>
>
>   exec 'import %s'%module_name
>
>   exec 'modules.append(\'%s\')'%module_name
>
> but this doesn't work as global does not cooperate with exec
> is there a __reload__('X') function like there is an __import__(?X?) function? 
>
> Also is there a better way to import modules at run time?
>
> Cheers and here is the test script in case you can't access the attachment
>
> def a():
>     global modules
>     global sys
>     import sys
>
>     modules.append('sys')
>
> def b():
>     global modules
>     global sys
>
>     reload(sys)
>
> def c(module_name):
>     global modules
>     exec 'global %s'%module_name
>     exec 'import %s'%module_name
>
>     modules.append(module_name)
>
> def test():
>     global modules
>     global sys
>
>     #create the module list to contain all the modules
>     modules=[]
>
>     print 'originally dir() returns:'
>     print dir()
>
>     a()
>     print 'function a() properly imports the following module:'
>     print sys
>     print 'is %s in %s->%s'%('sys',modules,'sys' in modules)
>     
>     b()
>     print 'function b() properly reloads the following module:'
>     print sys
>     print 'is %s still in %s->%s'%('sys',modules,'sys' in modules)
>
>     try:
>         c('os')
>         print 'function c() properly imports the following module:'
>     except:
>         print 'function c() failed to import module os'
>         print 'is %s in %s->%s'%('os',modules,'os' in modules)
>
>     try:
>         print os
>         print 'is %s still in %s->%s'%('os',modules,'os' in modules)
>     except:
>         print 'os was loaded, but is not visible outside of the scope of c()'
> --- On Fri, 3/19/10, python-list-request at python.org <python-list-request at python.org> wrote:
>
> From: python-list-request at python.org <python-list-request at python.org>
> Subject: Python-list Digest, Vol 78, Issue 192
> To: python-list at python.org
> Received: Friday, March 19, 2010, 7:05 AM
>
> <snip>
(When starting a new thread, create a new message addressed to   
python-list at python.org, do not just reply to an existing message, (or 
digest, which you did here).  Some people actually try to follow 
threads, and the software to do that uses more information than just the 
message subject)

First comment.  I would seriously try to avoid using reload() in 
production code.  The problems that can result are subtle.  I use it for 
debugging sessions, but not in real programs.

But I'll assume you have a use case (which would have been good to 
explain), and have rejected the other possibilities.

Next, I'll point out that reloading sys isn't desirable, and it's one of 
the specifically proscribed modules for reloading.  But probably you 
weren't really using sys, you were just sanitizing the code since you 
knew we all had sys.

Next, if your reason for reloading is that you just changed the module 
programmatically, and it might have been loaded by some other module (as 
sys is, for example, long before your code starts), then you're not 
checking in the right place.  Instead of looking at your own global 
space, you should be looking at sys.modules to decide whether something 
has been loaded.

Perhaps the function you're looking for is imp.load_module()

DaveA



From ben+python at benfinney.id.au  Fri Mar 19 08:56:49 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 19 Mar 2010 23:56:49 +1100
Subject: should writing Unicode files be so slow
References: <hnu9gl$fg7e$1@uns-a.ucl.ac.uk> <8739zxw057.fsf@benfinney.id.au>
	<hnvpfj$7k76$1@uns-a.ucl.ac.uk>
Message-ID: <87ljdov59q.fsf@benfinney.id.au>

djc <slais-www at ucl.ac.uk> writes:

> Ben Finney wrote:
> > Could you please:
> > 
> > * simplify it further: make a minimal version that demonstrates the
> >   difference you're seeing, without any extraneous stuff that doesn't
> >   appear to affect the result.
> > 
> > * make it complete: the code you've shown doesn't do anything except
> >   define some functions.
> > 
> > In other words: please reduce it to a complete, minimal example that we
> > can run to see the same behaviour you're seeing.
>
> It is the minimal example. The only thing omited is the opt.parse code
> that calls _file_to_files(infile, outfile_prefix, column, sep):

What happens, then, when you make a smaller program that deals with only
one file?

What happens when you make a smaller program that only reads the file,
and doesn't write any? Or a different program that only writes a file,
and doesn't read any?

It's these sort of reductions that will help narrow down exactly what
the problem is. Do make sure that each example is also complete (i.e.
can be run as is by someone who uses only that code with no additions).

-- 
 \       ?To have the choice between proprietary software packages, is |
  `\      being able to choose your master. Freedom means not having a |
_o__)                        master.? ?Richard M. Stallman, 2007-05-16 |
Ben Finney


From googler.1.webmaster at spamgourmet.com  Fri Mar 19 09:12:34 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Fri, 19 Mar 2010 06:12:34 -0700 (PDT)
Subject: C-API PyObject_Call
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
	<mailman.849.1268756405.23598.python-list@python.org>
	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>
	<mailman.858.1268759662.23598.python-list@python.org>
	<c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>
	<mailman.883.1268808393.23598.python-list@python.org>
	<3592cca0-2a4a-4a19-9e10-d80936e6d200@upsg2000gro.googlegroups.com>
	<mailman.943.1268899999.23598.python-list@python.org>
	<793e5934-bc1b-4023-aa0e-bf6d956177fd@f8g2000yqn.googlegroups.com>
	<mailman.956.1268930626.23598.python-list@python.org>
Message-ID: <fd5b82be-b56c-4024-ad3b-b1a53698cf1f@r27g2000yqn.googlegroups.com>

In my case I call a funcion and I would like to get the line
where the function returned.

for instance:


def my_function():
    return 3

So I would like to get line 2(in C) somehow.


From jeanmichel at sequans.com  Fri Mar 19 09:49:22 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 19 Mar 2010 14:49:22 +0100
Subject: logging: local functions ==> loss of lineno
In-Reply-To: <hnvqe5$vc$02$1@news.t-online.com>
References: <mailman.576.1268256192.23598.python-list@python.org>	<hnaj9c$i0u$02$1@news.t-online.com>	<4BA295A1.70207@hellmutweber.de>	<mailman.972.1268995215.23598.python-list@python.org>
	<hnvqe5$vc$02$1@news.t-online.com>
Message-ID: <4BA380E2.8060306@sequans.com>

Peter Otten wrote:
> Jean-Michel Pichavant wrote:
>
>   
>> Hellmut Weber wrote:
>>     
>>> Am 11.03.2010 12:14, schrieb Peter Otten:
>>>       
>>>> Hellmut Weber wrote:
>>>>
>>>>         
>>>>> Logging works very well giving the filename and line number of the
>>>>> point
>>>>> where it is called. As long as I use the loggers directly.
>>>>> BUT when I have to wrap the logger call in some other function, I
>>>>> always
>>>>> get file name and line number of the call of the logger inside the
>>>>> wrapping function.
>>>>>
>>>>> Is there a possibility to get this information in this situation too?
>>>>>           
>>>> The official way is probably to write a custom Logger class that
>>>> overrides
>>>> the findCaller() method.
>>>>
>>>> Below is a hack that monkey-patches the logging._srcfile attribute to
>>>> ignore
>>>> user-specified modules in the call stack:
>>>>
>>>> $ cat wrapper.py
>>>> import logging
>>>> import os
>>>> import sys
>>>>
>>>> logger = logging.getLogger()
>>>>
>>>> class SrcFile(object):
>>>>      def __init__(self, exclude_files):
>>>>          self.files = set(exclude_files)
>>>>      def __eq__(self, other):
>>>>          return other in self.files
>>>>
>>>> def fixname(filename):
>>>>      if filename.lower().endswith((".pyc", ".pyo")):
>>>>          filename = filename[:-4] + ".py"
>>>>      return os.path.normcase(filename)
>>>>
>>>> if "--monkey" in sys.argv:
>>>>      print "patching"
>>>>      logging._srcfile = SrcFile([logging._srcfile, fixname(__file__)])
>>>>
>>>> def warn(*args, **kw):
>>>>      logger.warn(*args, **kw)
>>>>
>>>> $ cat main.py
>>>> import logging
>>>> logging.basicConfig(format="%(filename)s<%(lineno)s>: %(message)s")
>>>> import wrapper
>>>> wrapper.warn("foo")
>>>> wrapper.warn("bar")
>>>> wrapper.warn("baz")
>>>>
>>>> $ python main.py
>>>> wrapper.py<23>: foo
>>>> wrapper.py<23>: bar
>>>> wrapper.py<23>: baz
>>>>
>>>> $ python main.py --monkey
>>>> patching
>>>> main.py<4>: foo
>>>> main.py<5>: bar
>>>> main.py<6>: baz
>>>>
>>>> $ python -V
>>>> Python 2.6.4
>>>>
>>>> Peter
>>>>         
>>> Hi Peter,
>>> your hack is exactly what I was looking for.
>>> It permits to configure my logging messages as I want, e.g. using
>>> different colors for different classes of messages.
>>>
>>> I do not yet understand all details WHY it is working but suppose some
>>> study of the logging module will help me to understand.
>>>
>>> Thank you very much
>>>
>>>       
>> _scrFile is a private attribute of the logging module. Don't change it.
>>
>> As you said yourself, 'The official way is probably to write a custom
>> Logger class that overrides
>> the findCaller() method'
>>     
>
> OK, I tried the this approach, too:
>
> import logging
> import os
> import sys
>
> from logging import currentframe
>
> def fixname(filename):
>     if filename.lower().endswith((".pyc", ".pyo")):
>         filename = filename[:-4] + ".py"
>     return os.path.normcase(filename)
>
> class MyLogger(logging.Logger):
>     exclude_files = set([logging._srcfile, fixname(__file__)])
>
>     def findCaller(self):
>         """
>         Find the stack frame of the caller so that we can note the source
>         file name, line number and function name.
>         """
>         f = currentframe()
>         #On some versions of IronPython, currentframe() returns None if
>         #IronPython isn't run with -X:Frames.
>         if f is not None:
>             f = f.f_back
>         rv = "(unknown file)", 0, "(unknown function)"
>         while hasattr(f, "f_code"):
>             co = f.f_code
>             filename = os.path.normcase(co.co_filename)
>             if filename in self.exclude_files:
>                 f = f.f_back
>                 continue
>             rv = (filename, f.f_lineno, co.co_name)
>             break
>         return rv
>
> if "--custom-logger" in sys.argv:
>     print "setting custom logger"
>     logging.setLoggerClass(MyLogger)
>     logging.root = MyLogger("root", logging.WARNING)
>
> logger = logging.getLogger()
> def warn(*args, **kw):
>     logger.warn(*args, **kw)
>
> I had to duplicate the original findCaller() method with only one line 
> changed. This means I have now some code duplication and I still have to 
> monitor future changes in the logging source.
>
> In this case the "official way" seems to be more intrusive than the "hack".
>
> Peter
You are still accessing the private attribute of the  module logging.
My previous remark was misleading, in fact there's nothing you can do 
about it.
_srcfile is not meant to be used elsewhere than in the logging module 
itself.

However, I don't wanna sound like I'm rejecting this solution, 1st the 
OP is satisified with it and since this solution is working, it is still 
more helpful than anyone noticing that you've accessed a private 
attribute (some will successfully argue that python allows to do so).

At the very begining of this thread I've provided a complete different 
approach, instead of using the builtin 'filename' and 'lineno' field of 
the logging, use custom fileds with the extra parameter.

It has also some drawbacks but could be a possible alternative.

Cheers,

JM

in test.py:

import logging
import inspect

_logger = logging.getLogger(__name__)

class Foo:
   def __init__(self):
       self._logger = _logger

   def info(self, msg):
       # this is the method you don't want to appear in the logs, 
instead the lineno and filename of this method caller
       previousFrame = inspect.currentframe().f_back
       self._logger.info(msg, 
extra={'custom_lineno':previousFrame.f_lineno, 'custom_filename': 
previousFrame.f_code.co_filename})

if __name__ == '__main__':
   _logger.handlers=[]
   _logger.addHandler(logging.StreamHandler())
   _logger.handlers[-1].setFormatter(logging.Formatter('file 
%(custom_filename)s line %(custom_lineno)d : %(message)s'))
   _logger.setLevel(logging.DEBUG)
   foo = Foo()
   foo.info('a foo info')

In [3]: run test.py
file test.py line 20 : a foo info



From królewna at ee.pl  Fri Mar 19 09:58:22 2010
From: królewna at ee.pl (=?ISO-8859-2?Q?kr=F3lewna?=)
Date: Fri, 19 Mar 2010 14:58:22 +0100
Subject: SOLUTION
In-Reply-To: <hnt81m$fsi$1@news.task.gda.pl>
References: <hnt81m$fsi$1@news.task.gda.pl>
Message-ID: <hnvvtt$u1p$1@news.task.gda.pl>

I have found the solution. I dont know why in python documentation there 
is not a single word about this option. I've found it in pysqlite doc 
site. So we have to add a new keyword argument to connection function 
and we will be able to create cursors out of it in different thread. So use:

sqlite.connect(":memory:", check_same_thread = False)

works out perfectly for me. Of course from now on me need to take care 
of safe multithreading access to the db. Anyway thx all for trying to help.

--
best regards
princess


From stefan_ml at behnel.de  Fri Mar 19 10:11:42 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 19 Mar 2010 15:11:42 +0100
Subject: C-API PyObject_Call
In-Reply-To: <fd5b82be-b56c-4024-ad3b-b1a53698cf1f@r27g2000yqn.googlegroups.com>
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>	<mailman.849.1268756405.23598.python-list@python.org>	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>	<mailman.858.1268759662.23598.python-list@python.org>	<c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>	<mailman.883.1268808393.23598.python-list@python.org>	<3592cca0-2a4a-4a19-9e10-d80936e6d200@upsg2000gro.googlegroups.com>	<mailman.943.1268899999.23598.python-list@python.org>	<793e5934-bc1b-4023-aa0e-bf6d956177fd@f8g2000yqn.googlegroups.com>	<mailman.956.1268930626.23598.python-list@python.org>
	<fd5b82be-b56c-4024-ad3b-b1a53698cf1f@r27g2000yqn.googlegroups.com>
Message-ID: <ho00mu$dgi$1@dough.gmane.org>

moerchendiser2k3, 19.03.2010 14:12:
> In my case I call a funcion and I would like to get the line
> where the function returned.
>
> for instance:
>
>
> def my_function():
>      return 3
>
> So I would like to get line 2(in C) somehow.

Ok, so you're looking for the C-level trace function in CPython, I guess.

Could you explain why you want to know the line number?

Stefan



From python at hope.cz  Fri Mar 19 11:32:32 2010
From: python at hope.cz (Johny)
Date: Fri, 19 Mar 2010 08:32:32 -0700 (PDT)
Subject: What is pkg-config for ?
Message-ID: <ad871976-202d-4495-8294-2047573b565b@c16g2000yqd.googlegroups.com>

Can anyone explain what is pkg-config  for?ANd how can I find it in
Windows?
Thanks


From peter_peyman_puk at yahoo.ca  Fri Mar 19 13:09:09 2010
From: peter_peyman_puk at yahoo.ca (Peter Peyman Puk)
Date: Fri, 19 Mar 2010 17:09:09 +0000
Subject: Importing v reloading modules modules
In-Reply-To: <4BA3A738.1050401@ieee.org>
References: <202203.80122.qm@web43401.mail.sp1.yahoo.com>
	<4BA3A738.1050401@ieee.org>
Message-ID: <6A6EB8D2-4910-415D-81A5-FB6C004C9AD9@yahoo.ca>

Hello

I submitted this earlier today, but I was not clear enough, so I am  
posting it again.

I am running a simulator written in python. The simulator has a small  
TextView (actually a SourceView) widget which lets the user writes  
scripts, and when they are satisfied they can execute that script to  
get results. For arguments sake, we write a simple script and save it  
as A.py and we import it and execute it more or less like so.

import A

#assume there is a function called test() in module A
A.test()


Then the user modifies the contents of A.py and saves it again (to  
A.py) now all we have to do is the following

if 'A' in dir():
  reload(A)
else:
  import A

A.test()

But since the user chooses the file name, and not me, the programmer,  
the module names will vary. Let's assume the module names are loaded  
and stored in the list module_names, and we iterate over them, and  
pass them as arguments to a function to import or reload each model as  
appropriate

def import_or_reload(module_name):

  if module_name in sys.modules:
   #somehow reload
  else:
   #somehow import

does anyone know how to deal with the reload and import as they both  
present problems since module_name is a string, and to reload  
something along the lines of the below must be executed

exec 'reload(%s)'%module_name

and then we also have to deal with the scope issue since the loaded  
module will be local and not global. I can execute something like so

exec 'global %s'%module_name

but that does not work very well with exec

any suggestions?

Cheers


Peyman



From slais-www at ucl.ac.uk  Fri Mar 19 13:18:17 2010
From: slais-www at ucl.ac.uk (djc)
Date: Fri, 19 Mar 2010 17:18:17 +0000
Subject: should writing Unicode files be so slow
In-Reply-To: <87ljdov59q.fsf@benfinney.id.au>
References: <hnu9gl$fg7e$1@uns-a.ucl.ac.uk>
	<8739zxw057.fsf@benfinney.id.au>	<hnvpfj$7k76$1@uns-a.ucl.ac.uk>
	<87ljdov59q.fsf@benfinney.id.au>
Message-ID: <ho0bkp$cc3g$1@uns-a.ucl.ac.uk>

Ben Finney wrote:

> What happens, then, when you make a smaller program that deals with only
> one file?
> 
> What happens when you make a smaller program that only reads the file,
> and doesn't write any? Or a different program that only writes a file,
> and doesn't read any?
> 
> It's these sort of reductions that will help narrow down exactly what
> the problem is. Do make sure that each example is also complete (i.e.
> can be run as is by someone who uses only that code with no additions).
> 


The program reads one csv file of 9,293,271 lines.
869M wb.csv
  It  creates  set  of  files containing the  same  lines  but  where  each
 output file in the set  contains only those lines where the value of a
particular column is the same, the number of  output files will depend on
the number of distinct values  in that column In the example that results
in 19 files

74M tt_11696870405.txt
94M tt_18762175493.txt
15M  tt_28668070915.txt
12M tt_28673313795.txt
15M  tt_28678556675.txt
11M  tt_28683799555.txt
12M  tt_28689042435.txt
15M  tt_28694285315.txt
7.3M  tt_28835845125.txt
6.8M tt_28842136581.txt
12M  tt_28848428037.txt
11M  tt_28853670917.txt
12M  tt_28858913797.txt
15M  tt_28864156677.txt
11M  tt_28869399557.txt
11M  tt_28874642437.txt
283M  tt_31002203141.txt
259M  tt_33335282691.txt
45 2010-03-19 17:00 tt_taskid.txt

changing
with open(filename, 'rU') as tabfile:
to
with codecs.open(filename, 'rU', 'utf-8', 'backslashreplace') as tabfile:

and
with open(outfile, 'wt') as out_part:
to
with codecs.open(outfile, 'w', 'utf-8') as out_part:

causes a program that runs  in
43 seconds to take 4 minutes to process the same data. In this particular
case  that is  not very  important, any unicode strings in the data are not
worth troubling over and I have already  spent more  time satisfying
curiousity  that  will  ever  be  required  to  process  the dataset  in
future.  But  I have another  project  in  hand where not only is the
unicode significant but the files are very much larger. Scale up the
problem and the difference between 4 hours and 24 become a matter worth
some attention.



-- 
David Clark, MSc, PhD.              UCL Centre for Publishing
                                    Gower Str London WCIE 6BT
What sort of web animal are you?
            <https://www.bbc.co.uk/labuk/experiments/webbehaviour>


From incensedprey at gmail.com  Fri Mar 19 13:42:53 2010
From: incensedprey at gmail.com (Kevin Adams)
Date: Fri, 19 Mar 2010 10:42:53 -0700 (PDT)
Subject: [python3]
Message-ID: <e6ed708b-c010-451d-8de7-8a885c788d4b@t20g2000yqe.googlegroups.com>

Greetings!

Please forgive me if im posting this to the wrong group.

I'm new to Python, learning Python3 from the O'rielly "Learning
Python" book.  Reading
about operator overloading, specifically __getitem__.   I put together
a small bit of code to
do some experimenting and threw in a timer so i can see it do its
thing.  For some reason
the time.sleep(x) function doesnt work when my print function includes
"end=''".

Thanks in advance for any help.


---code---

class TestClass():
    def __init__(self):
        self.data = "I was far from home and the spell of the eastern
sea was upon me."

    def __getitem__(self,i):
        return self.data[i]


import time

if __name__ == "__main__":

    me = TestClass()
    for x in me:
        print(x,end='')  #if i remove the 'end='''  it performs as i'd
expect
        time.sleep(int(2))



From tjreedy at udel.edu  Fri Mar 19 14:02:02 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 19 Mar 2010 14:02:02 -0400
Subject: Importing v reloading modules modules
In-Reply-To: <6A6EB8D2-4910-415D-81A5-FB6C004C9AD9@yahoo.ca>
References: <202203.80122.qm@web43401.mail.sp1.yahoo.com>	<4BA3A738.1050401@ieee.org>
	<6A6EB8D2-4910-415D-81A5-FB6C004C9AD9@yahoo.ca>
Message-ID: <ho0e6p$4lm$1@dough.gmane.org>

Reload is effectively deprecated in 2.x and removed in 3.x, so I 
recommend not using it.

Deleting an entry from sys.modules should force recreation with an 
import. Just make sure all other references are also gone so that the 
module object can be deleted.

The following shows how to import by name in string and globally from 
within a function.

def f():
     global itertools
     itertools = __import__('itertools')

f()
print(itertools) # 3.1

#<module 'itertools' (built-in)>

Terry Jan Reedy



From steve at holdenweb.com  Fri Mar 19 14:17:31 2010
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 19 Mar 2010 14:17:31 -0400
Subject: [python3]
In-Reply-To: <e6ed708b-c010-451d-8de7-8a885c788d4b@t20g2000yqe.googlegroups.com>
References: <e6ed708b-c010-451d-8de7-8a885c788d4b@t20g2000yqe.googlegroups.com>
Message-ID: <ho0f44$7m8$1@dough.gmane.org>

Kevin Adams wrote:
> Greetings!
> 
> Please forgive me if im posting this to the wrong group.
> 
> I'm new to Python, learning Python3 from the O'rielly "Learning
> Python" book.  Reading
> about operator overloading, specifically __getitem__.   I put together
> a small bit of code to
> do some experimenting and threw in a timer so i can see it do its
> thing.  For some reason
> the time.sleep(x) function doesnt work when my print function includes
> "end=''".
> 
> Thanks in advance for any help.
> 
> 
Try the following changes:

> ---code---
> 
> class TestClass():
>     def __init__(self):
>         self.data = "I was far from home and the spell of the eastern
> sea was upon me."
> 
>     def __getitem__(self,i):
>         return self.data[i]
> 
> 
> import time

import sys
> 
> if __name__ == "__main__":
> 
>     me = TestClass()
>     for x in me:
>         print(x,end='')  #if i remove the 'end='''  it performs as i'd
> expect
          sys.stdout.flush()

>         time.sleep(int(2))
> 

It may just be that the output is being held in buffers until the
program terminates. the fluch() methof pushes it straight out.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From krister.svanlund at gmail.com  Fri Mar 19 14:19:04 2010
From: krister.svanlund at gmail.com (Krister Svanlund)
Date: Fri, 19 Mar 2010 19:19:04 +0100
Subject: [python3]
In-Reply-To: <e6ed708b-c010-451d-8de7-8a885c788d4b@t20g2000yqe.googlegroups.com>
References: <e6ed708b-c010-451d-8de7-8a885c788d4b@t20g2000yqe.googlegroups.com>
Message-ID: <2cf430a61003191119h688fef20u528f7e154680c00c@mail.gmail.com>

On Fri, Mar 19, 2010 at 6:42 PM, Kevin Adams <incensedprey at gmail.com> wrote:
> Greetings!
>
> Please forgive me if im posting this to the wrong group.
>
> I'm new to Python, learning Python3 from the O'rielly "Learning
> Python" book. ?Reading
> about operator overloading, specifically __getitem__. ? I put together
> a small bit of code to
> do some experimenting and threw in a timer so i can see it do its
> thing. ?For some reason
> the time.sleep(x) function doesnt work when my print function includes
> "end=''".
>
> Thanks in advance for any help.
>
>
> ---code---
>
> class TestClass():
> ? ?def __init__(self):
> ? ? ? ?self.data = "I was far from home and the spell of the eastern
> sea was upon me."
>
> ? ?def __getitem__(self,i):
> ? ? ? ?return self.data[i]
>
>
> import time
>
> if __name__ == "__main__":
>
> ? ?me = TestClass()
> ? ?for x in me:
> ? ? ? ?print(x,end='') ?#if i remove the 'end=''' ?it performs as i'd
> expect
> ? ? ? ?time.sleep(int(2))
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>

I'm guessing wildly here but I think you have to flush the output.
Can't remember how right now but it won't take much googling for it.


From tjreedy at udel.edu  Fri Mar 19 14:21:34 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 19 Mar 2010 14:21:34 -0400
Subject: [python3]
In-Reply-To: <e6ed708b-c010-451d-8de7-8a885c788d4b@t20g2000yqe.googlegroups.com>
References: <e6ed708b-c010-451d-8de7-8a885c788d4b@t20g2000yqe.googlegroups.com>
Message-ID: <ho0fbd$8vq$1@dough.gmane.org>

On 3/19/2010 1:42 PM, Kevin Adams wrote:

> Please forgive me if im posting this to the wrong group.

Just the right place. I would suggest a more informative title in the 
future though. 'Problem with print and sleep.', for instance.

>
> I'm new to Python, learning Python3 from the O'rielly "Learning
> Python" book.  Reading
> about operator overloading, specifically __getitem__.   I put together
> a small bit of code to
> do some experimenting and threw in a timer so i can see it do its
> thing.

Good idea. Welcome to Python.

>  For some reason
> the time.sleep(x) function doesnt work when my print function includes
> "end=''".

I cut your code, pasted it into IDLE edit window, and made two minor 
modifications. For me (3.1, winxp) it works perfectly either way -- 
chars print at 1 sec intervals either vertically or horizonatally. So I 
am not sure what you are claiming.
>
> Thanks in advance for any help.
>
>
> ---code---
>
> class TestClass():
>      def __init__(self):
>          self.data = "I was far from home and the spell of the eastern
> sea was upon me."

I shortened string
>
>      def __getitem__(self,i):
>          return self.data[i]
>
> import time
>
> if __name__ == "__main__":
>
>      me = TestClass()
>      for x in me:
>          print(x,end='')  #if i remove the 'end='''  it performs as i'd
> expect
>          time.sleep(int(2))

int(2) == 2, so delete irrelevant call, and 1 sec is enough

Terry Jan Reedy




From incensedprey at gmail.com  Fri Mar 19 14:46:40 2010
From: incensedprey at gmail.com (Kevin Adams)
Date: Fri, 19 Mar 2010 11:46:40 -0700 (PDT)
Subject: [python3]
References: <e6ed708b-c010-451d-8de7-8a885c788d4b@t20g2000yqe.googlegroups.com>
	<mailman.983.1269022911.23598.python-list@python.org>
Message-ID: <5780a357-08a2-4393-9b2d-e07e4bb14b83@q16g2000yqq.googlegroups.com>

On Mar 19, 2:21?pm, Terry Reedy <tjre... at udel.edu> wrote:
> On 3/19/2010 1:42 PM, Kevin Adams wrote:
>
> > Please forgive me if im posting this to the wrong group.
>
> Just the right place. I would suggest a more informative title in the
> future though. 'Problem with print and sleep.', for instance.
>
>
>
> > I'm new to Python, learning Python3 from the O'rielly "Learning
> > Python" book. ?Reading
> > about operator overloading, specifically __getitem__. ? I put together
> > a small bit of code to
> > do some experimenting and threw in a timer so i can see it do its
> > thing.
>
> Good idea. Welcome to Python.
>
> > ?For some reason
> > the time.sleep(x) function doesnt work when my print function includes
> > "end=''".
>
> I cut your code, pasted it into IDLE edit window, and made two minor
> modifications. For me (3.1, winxp) it works perfectly either way --
> chars print at 1 sec intervals either vertically or horizonatally. So I
> am not sure what you are claiming.
>
>
>
> > Thanks in advance for any help.
>
> > ---code---
>
> > class TestClass():
> > ? ? ?def __init__(self):
> > ? ? ? ? ?self.data = "I was far from home and the spell of the eastern
> > sea was upon me."
>
> I shortened string
>
>
>
> > ? ? ?def __getitem__(self,i):
> > ? ? ? ? ?return self.data[i]
>
> > import time
>
> > if __name__ == "__main__":
>
> > ? ? ?me = TestClass()
> > ? ? ?for x in me:
> > ? ? ? ? ?print(x,end='') ?#if i remove the 'end=''' ?it performs as i'd
> > expect
> > ? ? ? ? ?time.sleep(int(2))
>
> int(2) == 2, so delete irrelevant call, and 1 sec is enough
>
> Terry Jan Reedy

Thanks to all!!!

It did indeed turn out to be a need to flush the stdout.

K

ps.  sorry for the brief subject, i wasnt finish and hit send before
comming back to it.



From heintest at web.de  Fri Mar 19 14:46:45 2010
From: heintest at web.de (=?ISO-8859-15?Q?Hans_M=FCller?=)
Date: Fri, 19 Mar 2010 19:46:45 +0100
Subject: Reserving binary Buffer for struct.pack_into() of exact length
Message-ID: <4ba3c6ce$0$6990$9b4e6d93@newsspool4.arcor-online.net>

Hello,

I need some buffers, which are beeing concatenated an then send via 
the socket() function.
My problem is that create_string_buffer() creates a buffer which ist 
one byte too long (for a \0 char). But when I concatenate some of 
these buffers to a long one to be transfered, the extra byte is 
corrupting the resulting buffer.
Of course I could slice the buffer before being concatended, but
this looks ugly to me.
Is there a way to create a writeable buffer object without the \0 byte ?

Thanks a lot

Hans


From tjreedy at udel.edu  Fri Mar 19 15:02:56 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 19 Mar 2010 15:02:56 -0400
Subject: [python3]
In-Reply-To: <ho0f44$7m8$1@dough.gmane.org>
References: <e6ed708b-c010-451d-8de7-8a885c788d4b@t20g2000yqe.googlegroups.com>
	<ho0f44$7m8$1@dough.gmane.org>
Message-ID: <ho0hov$hkb$1@dough.gmane.org>

On 3/19/2010 2:17 PM, Steve Holden wrote:
> Kevin Adams wrote:
>> Greetings!
>>
>> Please forgive me if im posting this to the wrong group.
>>
>> I'm new to Python, learning Python3 from the O'rielly "Learning
>> Python" book.  Reading
>> about operator overloading, specifically __getitem__.   I put together
>> a small bit of code to
>> do some experimenting and threw in a timer so i can see it do its
>> thing.  For some reason
>> the time.sleep(x) function doesnt work when my print function includes
>> "end=''".
>>
>> Thanks in advance for any help.
>>
>>
> Try the following changes:
>
>> ---code---
>>
>> class TestClass():
>>      def __init__(self):
>>          self.data = "I was far from home and the spell of the eastern
>> sea was upon me."
>>
>>      def __getitem__(self,i):
>>          return self.data[i]
>>
>>
>> import time
>
> import sys
>>
>> if __name__ == "__main__":
>>
>>      me = TestClass()
>>      for x in me:
>>          print(x,end='')  #if i remove the 'end='''  it performs as i'd
>> expect
>            sys.stdout.flush()
>
>>          time.sleep(int(2))
>
> It may just be that the output is being held in buffers until the
> program terminates. the fluch() methof pushes it straight out.

The IDLE Shell window must get print output back from the pythonw 
process without buffering. When I cut and pasted from IDLE editor to 
standard interpreter window, output was bunched after several seconds. 
OP should have started with short string and minimal delay so output 
would not take a whole minute. Flushing fixed problem in standard 
interpreter. I will have to remember that testing partial line output in 
IDLE does not show how it will act elsewhere.

Kevin: when reporting a problem, be more specific as to what 'does not 
work' means.

Terry Jan Reedy



From emile at fenx.com  Fri Mar 19 16:33:00 2010
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 19 Mar 2010 13:33:00 -0700
Subject: Reserving binary Buffer for struct.pack_into() of exact length
In-Reply-To: <4ba3c6ce$0$6990$9b4e6d93@newsspool4.arcor-online.net>
References: <4ba3c6ce$0$6990$9b4e6d93@newsspool4.arcor-online.net>
Message-ID: <ho0n1d$4is$1@dough.gmane.org>

On 3/19/2010 11:46 AM Hans M?ller said...
> Hello,
>
> I need some buffers, which are beeing concatenated an then send via the
> socket() function.
> My problem is that create_string_buffer() creates a buffer which ist one
> byte too long (for a \0 char). But when I concatenate some of these
> buffers to a long one to be transfered, the extra byte is corrupting the
> resulting buffer.
> Of course I could slice the buffer before being concatended, but
> this looks ugly to me.
> Is there a way to create a writeable buffer object without the \0 byte ?
>
> Thanks a lot
>
> Hans

 >>> p = create_string_buffer(5)
 >>> p.raw='hello'
 >>> p.value
'hello'



From saimapk81 at gmail.com  Fri Mar 19 17:03:41 2010
From: saimapk81 at gmail.com (saima81)
Date: Fri, 19 Mar 2010 14:03:41 -0700 (PDT)
Subject: "Sexy Girls" "Sexy Indian Girls" "Sexy USA Girls" "Sexy RUSSIAN 
	Girls" "Sexy PAKISTANI Girls" "Sexy CHINESE Girls" "Sexy THAI Girls"
	"Sexy JAPANESE Girls" "Sexy KOREAN Girls" "Sexy MODEL  Girls"  ON 
	www.sexyandpretty-girls.blogspot.com
Message-ID: <b6e93024-2537-4b25-8ae5-1474cd180944@t32g2000prg.googlegroups.com>

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Girls" "Sexy CHINESE  Girls" "Sexy THAI Girls" "Sexy JAPANESE Girls"
"Sexy KOREAN Girls" "Sexy MODEL  Girls"  ON www.sexyandpretty-girls.blogspot.com
"Sexy Girls" "Sexy Indian Girls" "Sexy USA Girls" "Sexy RUSSIAN Girls"
"Sexy PAKISTANI Girls" "Sexy CHINESE  Girls" "Sexy THAI Girls" "Sexy
JAPANESE Girls" "Sexy KOREAN Girls" "Sexy MODEL  Girls"  ON
www.sexyandpretty-girls.blogspot.com           "Sexy Girls" "Sexy
Indian Girls" "Sexy USA Girls" "Sexy RUSSIAN Girls" "Sexy PAKISTANI
Girls" "Sexy CHINESE  Girls" "Sexy THAI Girls" "Sexy JAPANESE Girls"
"Sexy KOREAN Girls" "Sexy MODEL  Girls"  ON www.sexyandpretty-girls.blogspot.com
"Sexy Girls" "Sexy Indian Girls" "Sexy USA Girls" "Sexy RUSSIAN Girls"
"Sexy PAKISTANI Girls" "Sexy CHINESE  Girls" "Sexy THAI Girls" "Sexy
JAPANESE Girls" "Sexy KOREAN Girls" "Sexy MODEL  Girls"  ON
www.sexyandpretty-girls.blogspot.com           "Sexy Girls" "Sexy
Indian Girls" "Sexy USA Girls" "Sexy RUSSIAN Girls" "Sexy PAKISTANI
Girls" "Sexy CHINESE  Girls" "Sexy THAI Girls" "Sexy JAPANESE Girls"
"Sexy KOREAN Girls" "Sexy MODEL  Girls"  ON www.sexyandpretty-girls.blogspot.com
"Sexy Girls" "Sexy Indian Girls" "Sexy USA Girls" "Sexy RUSSIAN Girls"
"Sexy PAKISTANI Girls" "Sexy CHINESE  Girls" "Sexy THAI Girls" "Sexy
JAPANESE Girls" "Sexy KOREAN Girls" "Sexy MODEL  Girls"  ON
www.sexyandpretty-girls.blogspot.com           "Sexy Girls" "Sexy
Indian Girls" "Sexy USA Girls" "Sexy RUSSIAN Girls" "Sexy PAKISTANI
Girls" "Sexy CHINESE  Girls" "Sexy THAI Girls" "Sexy JAPANESE Girls"
"Sexy KOREAN Girls" "Sexy MODEL  Girls"  ON www.sexyandpretty-girls.blogspot.com
"Sexy Girls" "Sexy Indian Girls" "Sexy USA Girls" "Sexy RUSSIAN Girls"
"Sexy PAKISTANI Girls" "Sexy CHINESE  Girls" "Sexy THAI Girls" "Sexy
JAPANESE Girls" "Sexy KOREAN Girls" "Sexy MODEL  Girls"  ON
www.sexyandpretty-girls.blogspot.com           "Sexy Girls" "Sexy
Indian Girls" "Sexy USA Girls" "Sexy RUSSIAN Girls" "Sexy PAKISTANI
Girls" "Sexy CHINESE  Girls" "Sexy THAI Girls" "Sexy JAPANESE Girls"
"Sexy KOREAN Girls" "Sexy MODEL  Girls"  ON www.sexyandpretty-girls.blogspot.com
"Sexy Girls" "Sexy Indian Girls" "Sexy USA Girls" "Sexy RUSSIAN Girls"
"Sexy PAKISTANI Girls" "Sexy CHINESE  Girls" "Sexy THAI Girls" "Sexy
JAPANESE Girls" "Sexy KOREAN Girls" "Sexy MODEL  Girls"  ON
www.sexyandpretty-girls.blogspot.com


From brandonc530 at gmail.com  Fri Mar 19 17:10:54 2010
From: brandonc530 at gmail.com (Brandon C)
Date: Fri, 19 Mar 2010 16:10:54 -0500
Subject: Truoble With A Search Script for ImageBin.org
In-Reply-To: <3020ae661003181800u55a5a654v7be4a524123eec65@mail.gmail.com>
References: <3020ae661003181800u55a5a654v7be4a524123eec65@mail.gmail.com>
Message-ID: <3020ae661003191410i2f5e831et16dbd6fbf9e67e4d@mail.gmail.com>

*grumble* *grumble* *grumble*

oops, sorry ... my mistake

it turns out that i misspelled one of the values and left another one out.
 here's the working script now for anyone who may care:

import urllib
import urllib2
url = 'http://imagebin.org/index.php?page=search'
values = {'search_for' : 'blah', 'field' : 'nickname', 'mode' : 'search'}
data = urllib.urlencode(values)
request = urllib2.Request(url, data)
response = urllib2.urlopen(request)
page = response.read()
print page

the value of 'field' is 'nickname, not 'Nickname';
and i left out the 'mode' one

tks for yalls help
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From gagsl-py2 at yahoo.com.ar  Fri Mar 19 17:12:14 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 19 Mar 2010 18:12:14 -0300
Subject: What is pkg-config for ?
References: <ad871976-202d-4495-8294-2047573b565b@c16g2000yqd.googlegroups.com>
Message-ID: <op.u9t2iolix6zn5v@lepton.softlabbsas.com.ar>

En Fri, 19 Mar 2010 12:32:32 -0300, Johny <python at hope.cz> escribi?:

> Can anyone explain what is pkg-config  for?ANd how can I find it in
> Windows?

Go to http://www.google.com/
Enter "pkg-config windows" (without quotes) in the input box.
Press the Search button.
You'll get this site at the top, or near it:
http://pkg-config.freedesktop.org/wiki/

I fail to see how is this relevant to Python...

-- 
Gabriel Genellina



From brandonc530 at gmail.com  Fri Mar 19 18:02:25 2010
From: brandonc530 at gmail.com (Brandon C)
Date: Fri, 19 Mar 2010 17:02:25 -0500
Subject: script to upload file using POST form
Message-ID: <3020ae661003191502r1b87844fj3af5a0ccd45a3120@mail.gmail.com>

got another question for yall wonderful minds; how can i upload a file to a
server that uses a POST form?

here's the link to the form that i'd like to be able to upload a file:
http://imagebin.org/index.php?page=add

tks
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From gagsl-py2 at yahoo.com.ar  Fri Mar 19 18:23:59 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 19 Mar 2010 19:23:59 -0300
Subject: should writing Unicode files be so slow
References: <hnu9gl$fg7e$1@uns-a.ucl.ac.uk> <8739zxw057.fsf@benfinney.id.au>
	<hnvpfj$7k76$1@uns-a.ucl.ac.uk> <87ljdov59q.fsf@benfinney.id.au>
	<ho0bkp$cc3g$1@uns-a.ucl.ac.uk>
Message-ID: <op.u9t5t9qkx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 19 Mar 2010 14:18:17 -0300, djc <slais-www at ucl.ac.uk> escribi?:
> Ben Finney wrote:
>
>> What happens, then, when you make a smaller program that deals with only
>> one file?
>>
>> What happens when you make a smaller program that only reads the file,
>> and doesn't write any? Or a different program that only writes a file,
>> and doesn't read any?
>>
>> It's these sort of reductions that will help narrow down exactly what
>> the problem is. Do make sure that each example is also complete (i.e.
>> can be run as is by someone who uses only that code with no additions).
>>
>
>
> The program reads one csv file of 9,293,271 lines.
> 869M wb.csv
>   It  creates  set  of  files containing the  same  lines  but  where   
> each
>  output file in the set  contains only those lines where the value of a
> particular column is the same, the number of  output files will depend on
> the number of distinct values  in that column In the example that results
> in 19 files
>
> changing
> with open(filename, 'rU') as tabfile:
> to
> with codecs.open(filename, 'rU', 'utf-8', 'backslashreplace') as tabfile:
>
> and
> with open(outfile, 'wt') as out_part:
> to
> with codecs.open(outfile, 'w', 'utf-8') as out_part:
>
> causes a program that runs  in
> 43 seconds to take 4 minutes to process the same data. In this particular
> case  that is  not very  important, any unicode strings in the data are  
> not
> worth troubling over and I have already  spent more  time satisfying
> curiousity  that  will  ever  be  required  to  process  the dataset  in
> future.  But  I have another  project  in  hand where not only is the
> unicode significant but the files are very much larger. Scale up the
> problem and the difference between 4 hours and 24 become a matter worth
> some attention.

Ok. Your test program is too large to determine what's going on. Try to  
determine first *which* part is slow:

- reading: measure the time it takes only to read a file, with open() and  
codecs.open()
It might be important the density of non-ascii characters and their  
relative code points (as utf-8 is much more efficient for ASCII data than,  
say, Hanzi)
- processing: measure the time it takes the processing part (fed with str  
vs unicode data)
- writing: measure the time it takes only to write a file, with open() and  
codecs.open()

Only then one can focus on optimizing the bottleneck.

-- 
Gabriel Genellina



From barry at python.org  Fri Mar 19 18:56:55 2010
From: barry at python.org (Barry Warsaw)
Date: Fri, 19 Mar 2010 18:56:55 -0400
Subject: RELEASED Python 2.6.5
Message-ID: <20100319185655.26e1bf1a@heresy>

On behalf of the Python community, I'm happy to announce the availability of
Python 2.6.5 final.  This is the latest production-ready version in the Python
2.6 series.

Python 2.6.5 fixes dozens of issues in the core, built-in modules, libraries,
and documentation since Python 2.6.4 was released back in October 2009.  We
highly recommend that you upgrade to Python 2.6.5.

Please see the NEWS file for all the gory details.

    http://www.python.org/download/releases/2.6.5/NEWS.txt

Source tarballs and the Windows installers can be downloaded from the Python
2.6.5 page.  The Mac OS X disk image will be uploaded soon.

    http://www.python.org/download/releases/2.6.5/

For more information on Python 2.6 in general, please see

    http://docs.python.org/whatsnew/2.6.html

Please report bugs for any Python version in the Python tracker.

    http://bugs.python.org

Enjoy,
-Barry

Barry Warsaw
barry at python.org
Python 2.6 Release Manager
(on behalf of the entire python-dev team)
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From ben+python at benfinney.id.au  Fri Mar 19 19:01:44 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sat, 20 Mar 2010 10:01:44 +1100
Subject: should writing Unicode files be so slow
References: <hnu9gl$fg7e$1@uns-a.ucl.ac.uk> <8739zxw057.fsf@benfinney.id.au>
	<hnvpfj$7k76$1@uns-a.ucl.ac.uk> <87ljdov59q.fsf@benfinney.id.au>
	<ho0bkp$cc3g$1@uns-a.ucl.ac.uk>
	<mailman.989.1269037452.23598.python-list@python.org>
Message-ID: <87d3yzvrtz.fsf@benfinney.id.au>

"Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> writes:

> Ok. Your test program is too large to determine what's going on. Try
> to determine first *which* part is slow:

Right. This is done by the diagnostic technique of writing *new*,
minimal, complete programs that exercise each piece of the functionality
separately.

You're not tinkering with the existing program that's misbehaving;
you're trying to *recreate* the misbehaviour under a simpler
environment.

Hope that helps. Feel free to continue posting complete minimal programs
that exercise one thing and show behaviour you're unsure about.

-- 
 \         ?We now have access to so much information that we can find |
  `\  support for any prejudice or opinion.? ?David Suzuki, 2008-06-27 |
_o__)                                                                  |
Ben Finney


From gagsl-py2 at yahoo.com.ar  Fri Mar 19 19:04:01 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 19 Mar 2010 20:04:01 -0300
Subject: script to upload file using POST form
References: <3020ae661003191502r1b87844fj3af5a0ccd45a3120@mail.gmail.com>
Message-ID: <op.u9t7ozr3x6zn5v@lepton.softlabbsas.com.ar>

En Fri, 19 Mar 2010 19:02:25 -0300, Brandon C <brandonc530 at gmail.com>  
escribi?:

> got another question for yall wonderful minds; how can i upload a file  
> to a
> server that uses a POST form?
>
> here's the link to the form that i'd like to be able to upload a file:
> http://imagebin.org/index.php?page=add

Unfortunately it isn't as easy as it should be:
http://bugs.python.org/issue3244

-- 
Gabriel Genellina



From steve at holdenweb.com  Fri Mar 19 19:32:44 2010
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 19 Mar 2010 19:32:44 -0400
Subject: Python Documentation website layout changed?
In-Reply-To: <4BA120A9.3060001@holdenweb.com>
References: <21fcbd63-fd1e-4b53-89b3-393c15591372@m37g2000yqf.googlegroups.com>	<27c7e0a7-5a26-40f2-94ba-0af9cb530d67@g28g2000yqh.googlegroups.com>
	<4BA120A9.3060001@holdenweb.com>
Message-ID: <ho11iv$69f$1@dough.gmane.org>

Steve Holden wrote:
> Andrej Mitrovic wrote:
>> On Mar 17, 6:41 pm, Andrej Mitrovic <andrej.mitrov... at gmail.com>
>> wrote:
>>> Hi,
>>>
>>> What happened to the sidebar on the left of the documentation website?
>>> It seems to be gone:
>>>
>>> http://docs.python.org/py3k/index.html
>>>
>>> I found it quite useful since I can quickly swap between Python2/3
>>> documentation, and between other parts of the documentation as well.
>> Edit: It looks like only the Python 3 pages are affected, the Python 2
>> pages are the same as before:
>>
>> http://docs.python.org/index.html
>>
>> Might be a bug?
> 
> I'll ask. Georg - is this known behavior or a temporary problem?
> 
It's a bug. Georg is on it.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From solipsis at pitrou.net  Fri Mar 19 20:19:07 2010
From: solipsis at pitrou.net (Antoine Pitrou)
Date: Sat, 20 Mar 2010 00:19:07 +0000 (UTC)
Subject: should writing Unicode files be so slow
References: <hnu9gl$fg7e$1@uns-a.ucl.ac.uk> <8739zxw057.fsf@benfinney.id.au>
	<hnvpfj$7k76$1@uns-a.ucl.ac.uk> <87ljdov59q.fsf@benfinney.id.au>
	<ho0bkp$cc3g$1@uns-a.ucl.ac.uk>
Message-ID: <ho149r$cl6$1@dough.gmane.org>

Le Fri, 19 Mar 2010 17:18:17 +0000, djc a ?crit?:
> 
> changing
> with open(filename, 'rU') as tabfile: to
> with codecs.open(filename, 'rU', 'utf-8', 'backslashreplace') as
> tabfile:
> 
> and
> with open(outfile, 'wt') as out_part: to
> with codecs.open(outfile, 'w', 'utf-8') as out_part:
> 
> causes a program that runs  in
> 43 seconds to take 4 minutes to process the same data.

codecs.open() (and the object it returns) is slow as it is written in 
pure Python.

Accelerated reading and writing of unicode files is available in Python 
2.7 and 3.1, using the new `io` module.

Regards

Antoine.




From speeze.pearson at gmail.com  Fri Mar 19 20:20:31 2010
From: speeze.pearson at gmail.com (Spencer Pearson)
Date: Fri, 19 Mar 2010 17:20:31 -0700 (PDT)
Subject: Tuples vs. variable-length argument lists
Message-ID: <843bf1a3-6e9b-48d2-8661-b3f776a6fde2@t32g2000prg.googlegroups.com>

Hi!

This might be more of a personal-preference question than anything,
but here goes: when is it appropriate for a function to take a list or
tuple as input, and when should it allow a varying number of
arguments? It seems as though the two are always interchangeable. For
a simple example...

def subtract( x, nums ):
  return x - sum( nums )

... works equally well if you define it as "subtract( x, *nums )" and
put an asterisk in front of any lists/tuples you pass it. I can't
think of any situation where you couldn't convert from one form to the
other with just a star or a pair of parentheses.

Is there a generally accepted convention for which method to use? Is
there ever actually a big difference between the two that I'm not
seeing?


From gagsl-py2 at yahoo.com.ar  Fri Mar 19 21:28:12 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 19 Mar 2010 22:28:12 -0300
Subject: Importing v reloading modules modules
References: <202203.80122.qm@web43401.mail.sp1.yahoo.com>
	<4BA3A738.1050401@ieee.org>
	<6A6EB8D2-4910-415D-81A5-FB6C004C9AD9@yahoo.ca>
Message-ID: <op.u9uedalzx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 19 Mar 2010 14:09:09 -0300, Peter Peyman Puk  
<peter_peyman_puk at yahoo.ca> escribi?:

> I am running a simulator written in python. The simulator has a small  
> TextView (actually a SourceView) widget which lets the user writes  
> scripts, and when they are satisfied they can execute that script to get  
> results. For arguments sake, we write a simple script and save it as  
> A.py and we import it and execute it more or less like so.
>
> import A
>
> #assume there is a function called test() in module A
> A.test()
>
>
> Then the user modifies the contents of A.py and saves it again (to A.py)  
> now all we have to do is the following
>
> if 'A' in dir():
>   reload(A)
> else:
>   import A
>
> A.test()

Terry Reedy already gave you an answer for this import problem.
I'd like to go one step back and question whether using import/modules is  
the right thing here.
Clearly A.py is not a module but a script (that's the word you used) - and  
one does not *import* a script but *executes* it.
That is, instead of using import/__import__, use exec (or execfile) within  
a known namespace:

import __builtin__
ns = {'__builtins__': __builtin__.__dict__}
exec contents_of_textview in ns
# any change made to ns is visible here

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Fri Mar 19 21:54:58 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 19 Mar 2010 22:54:58 -0300
Subject: Castrated traceback in sys.exc_info()
References: <7866674b-46ba-49e2-9d76-e8259ba22df0@z3g2000yqz.googlegroups.com>
	<20100317124019.7013dfa3@moriz.interne>
	<9fd96c3b1003170542t4ea864c6y359107cb747536da@mail.gmail.com>
Message-ID: <op.u9uflwxxx6zn5v@lepton.softlabbsas.com.ar>

En Wed, 17 Mar 2010 09:42:06 -0300, Pascal Chambon  
<chambon.pascal at gmail.com> escribi?:

> traceback functions indeed allow the manipulation of exception  
> tracebacks,
> but the root problem is that anyway, since that traceback is incomplete,
> your "traceback.format_exc().splitlines()" will only provide frames for
> callee (downward) functions, not caller (upward) ones, starting from the
> exception catching frame.

Either I don't understand what you mean, or I can't reproduce it:

<code>
import logging

def a(): return b()
def b(): return c()
def c(): return d()
def d(): raise ValueError

def main():
   logging.basicConfig(level=logging.DEBUG)
   try: a()
   except: logging.exception("An error")

main()
</code>

Output:

D:\temp>python test_logging.py
ERROR:root:An error
Traceback (most recent call last):
   File "test_logging.py", line 10, in main
     try: a()
   File "test_logging.py", line 3, in a
     def a(): return b()
   File "test_logging.py", line 4, in b
     def b(): return c()
   File "test_logging.py", line 5, in c
     def c(): return d()
   File "test_logging.py", line 6, in d
     def d(): raise ValueError
ValueError

-- 
Gabriel Genellina



From googler.1.webmaster at spamgourmet.com  Fri Mar 19 21:58:28 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Fri, 19 Mar 2010 18:58:28 -0700 (PDT)
Subject: Simple lock
Message-ID: <9fca30bd-8dd1-4952-a53d-88f44ec2e3ab@z4g2000yqa.googlegroups.com>

Hi,

I have a common question about locks:

class SetPointer
{
private:
	void *ptr;

	MY_LOCK lock;


public:
	void SetPointer(void *p)
	{
		Lock(this->lock);
		this->ptr = p;
	}

	void *GetPointer()
	{
		Lock(this->lock);
		return this->ptr;
	}
};


Just a question, is this lock redundant, when the Pointer can be set/
get from different threads?
Thanks a lot!! Bye, moerchendiser2k3


From googler.1.webmaster at spamgourmet.com  Fri Mar 19 22:01:45 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Fri, 19 Mar 2010 19:01:45 -0700 (PDT)
Subject: C-API PyObject_Call
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
	<mailman.849.1268756405.23598.python-list@python.org>
	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>
	<mailman.858.1268759662.23598.python-list@python.org>
	<c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>
	<mailman.883.1268808393.23598.python-list@python.org>
	<3592cca0-2a4a-4a19-9e10-d80936e6d200@upsg2000gro.googlegroups.com>
	<mailman.943.1268899999.23598.python-list@python.org>
	<793e5934-bc1b-4023-aa0e-bf6d956177fd@f8g2000yqn.googlegroups.com>
	<mailman.956.1268930626.23598.python-list@python.org>
	<fd5b82be-b56c-4024-ad3b-b1a53698cf1f@r27g2000yqn.googlegroups.com>
	<mailman.978.1269007923.23598.python-list@python.org>
Message-ID: <7597f6a5-5fe0-4a69-9f9b-f0d96f4499d1@g26g2000yqn.googlegroups.com>

Yes, the user is able to set a file which contains a function that
does what the user wants.
But in a case, I expect a special return value of this function.

So, I need to tell him, in which file/line the error occured,
otherwise he dont know
where to look.

Imagine he set 20 files, and all of them have implemented a special
function. So he
wouldnt know where to check for the error.

Bye, moerchendiser2k3


From ben+python at benfinney.id.au  Fri Mar 19 22:24:57 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sat, 20 Mar 2010 13:24:57 +1100
Subject: Simple lock
References: <9fca30bd-8dd1-4952-a53d-88f44ec2e3ab@z4g2000yqa.googlegroups.com>
Message-ID: <878w9nvifa.fsf@benfinney.id.au>

moerchendiser2k3 <googler.1.webmaster at spamgourmet.com> writes:

> I have a common question about locks:

You'd be best to ask in a forum related to the language you're using.
This (?comp.lang.python?) is a forum for users of the Python language.

-- 
 \         ?If you can do no good, at least do no harm.? ?_Slapstick_, |
  `\                                                     Kurt Vonnegut |
_o__)                                                                  |
Ben Finney


From clp2 at rebertia.com  Fri Mar 19 22:25:27 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 19 Mar 2010 19:25:27 -0700
Subject: Simple lock
In-Reply-To: <9fca30bd-8dd1-4952-a53d-88f44ec2e3ab@z4g2000yqa.googlegroups.com>
References: <9fca30bd-8dd1-4952-a53d-88f44ec2e3ab@z4g2000yqa.googlegroups.com>
Message-ID: <50697b2c1003191925l6fd1c19alf4f8cdf31053b547@mail.gmail.com>

On Fri, Mar 19, 2010 at 6:58 PM, moerchendiser2k3
<googler.1.webmaster at spamgourmet.com> wrote:
<question about using locks in C++ snipped>
>
> Thanks a lot!! Bye, moerchendiser2k3

This is the **Python** mailinglist/newsgroup; and your question isn't
about Python.

The C++ one is over there:
http://groups.google.com/group/comp.lang.c++.moderated/topics

Regards,
Chris


From python at mrabarnett.plus.com  Fri Mar 19 22:31:23 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 20 Mar 2010 02:31:23 +0000
Subject: Simple lock
In-Reply-To: <9fca30bd-8dd1-4952-a53d-88f44ec2e3ab@z4g2000yqa.googlegroups.com>
References: <9fca30bd-8dd1-4952-a53d-88f44ec2e3ab@z4g2000yqa.googlegroups.com>
Message-ID: <4BA4337B.6050301@mrabarnett.plus.com>

moerchendiser2k3 wrote:
> Hi,
> 
> I have a common question about locks:
> 
> class SetPointer
> {
> private:
> 	void *ptr;
> 
> 	MY_LOCK lock;
> 
> 
> public:
> 	void SetPointer(void *p)
> 	{
> 		Lock(this->lock);
> 		this->ptr = p;
> 	}
> 
> 	void *GetPointer()
> 	{
> 		Lock(this->lock);
> 		return this->ptr;
> 	}
> };
> 
> 
> Just a question, is this lock redundant, when the Pointer can be set/
> get from different threads?
> Thanks a lot!! Bye, moerchendiser2k3

1. That's C++. What does it have to do with Python?

2. The value you're accessing is a simple pointer which you're either
setting or getting, so a lock shouldn't be necessary.

3. You're locking, but never unlocking. The sequence should be: lock, do
stuff, unlock.


From nilly16 at yahoo.com  Fri Mar 19 23:04:08 2010
From: nilly16 at yahoo.com (Jimbo)
Date: Fri, 19 Mar 2010 20:04:08 -0700 (PDT)
Subject: Best Way to extract Numbers from String
Message-ID: <ded7c9a6-e4b1-46f7-97ca-fd66708f7443@g1g2000pre.googlegroups.com>

Hello

I am trying to grab some numbers from a string containing HTML text.
Can you suggest any good functions that I could use to do this? What
would be the easiest way to extract the following numbers from this
string...

My String has this layout & I have commented what I want to grab:
[CODE] """</th>
				<td class="last">43.200 </td>
				<td class="change indicator" nowrap>0.040 </td>

                                                   <td>43.150 </td> #
I need to grab this number only
				<td>43.200 </td>
                                                   <td>43.130 </td> #
I need to grab this number only
				<td>43.290 </td> 				             <td>43.100 </td> # I need to
grab this number only
				<td>7,450,447 </td>
				<td class="middle"><a
					href="/asx/markets/optionPrices.do?
by=underlyingCode&underlyingCode=BHP&expiryDate=&optionType=">Options</
a></td>
				<td class="middle"><a
					href="/asx/markets/warrantPrices.do?
by=underlyingAsxCode&underlyingCode=BHP">Warrants &amp; Structured
Products</a></td>
				<td class="middle"><a
					href="/asx/markets/cfdPrices.do?
by=underlyingAsxCode&underlyingCode=BHP">CFDs</a></td>
				<td class="middle"><a href="http://hfgapps.hubb.com/asxtools/
Charts.aspx?
TimeFrame=D6&amp;compare=comp_index&amp;indicies=XJO&amp;pma1=20&amp;pma2=20&amp;asxCode=BHP"><img
src="/images/chart.gif" border="0" height="15" width="15"></a>
</td>
				<td><a href="/research/announcements/status_notes.htm#XD">XD</a>
				</td>
				<td><a href="/asx/statistics/announcements.do?
by=asxCode&asxCode=BHP&timeframe=D&period=W">Recent</a>
</td>
			</tr>"""[/CODE]


From gagsl-py2 at yahoo.com.ar  Fri Mar 19 23:09:46 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 20 Mar 2010 00:09:46 -0300
Subject: Simple lock
References: <9fca30bd-8dd1-4952-a53d-88f44ec2e3ab@z4g2000yqa.googlegroups.com>
	<4BA4337B.6050301@mrabarnett.plus.com>
Message-ID: <op.u9ui2kxtx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 19 Mar 2010 23:31:23 -0300, MRAB <python at mrabarnett.plus.com>  
escribi?:
> moerchendiser2k3 wrote:

>>  class SetPointer
>> {
>> private:
>> 	void *ptr;
>>  	MY_LOCK lock;
>>   public:
>> 	void SetPointer(void *p)
>> 	{
>> 		Lock(this->lock);
>> 		this->ptr = p;
>> 	}

> 3. You're locking, but never unlocking. The sequence should be: lock, do
> stuff, unlock.

Just FYI: C++ doesn't have try/finally, and such behavior is usually  
emulated using a local object. When it goes out of scope, it is  
automatically destroyed, meaning that the object destructor is called.  
Whatever you would write in a "finally" clause, in C++ goes into a  
destructor.

Of course C++ guys would never say they're "emulating" try/finally,  
instead they declare RAII as *the* Only and Right Way :)

-- 
Gabriel Genellina



From steve at REMOVE-THIS-cybersource.com.au  Fri Mar 19 23:20:38 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 20 Mar 2010 03:20:38 GMT
Subject: Tuples vs. variable-length argument lists
References: <843bf1a3-6e9b-48d2-8661-b3f776a6fde2@t32g2000prg.googlegroups.com>
Message-ID: <4ba43f05$0$27838$c3e8da3@news.astraweb.com>

On Fri, 19 Mar 2010 17:20:31 -0700, Spencer Pearson wrote:

> Hi!
> 
> This might be more of a personal-preference question than anything, but
> here goes: when is it appropriate for a function to take a list or tuple
> as input, and when should it allow a varying number of arguments? 

That depends on the function as well as your personal preference.

Of course, you can also follow the lead of max and min and accept both:

>>> max(1, 2, 3, 4) == max([1, 2, 3, 4])
True

You need to consider which is more "natural" for the semantics of the 
function.


> It seems as though the two are always interchangeable. 

Not always. Consider sum(a, b, c, d).

Should that be "sum the sequence [a, b, c, d]" or "sum the sequence [a, 
b, c] with initial value d"? You might ask what difference it makes, but 
it may make a big difference:

* if a...d are floats, there may be differences in rounding errors 
  between a+b+c+d and d+a+b+c

* if a...d are lists, the order that you do the addition matters:
  ["a", "b", "c"] + ["d"] != ["d"] + ["a", "b", "c"]

* even if a...d are integers, it may make a big difference for
  performance. Perhaps not for a mere four arguments, but watch:

>>> n = 10**1000000
>>> seq = [n] + range(10001)
>>> from timeit import Timer
>>> t1 = Timer("sum(seq)", "from __main__ import n, seq; seq.append(-n)")
>>> t2 = Timer("sum(seq, -n)", "from __main__ import n, seq")
>>> min(t1.repeat(number=1))
6.1270790100097656
>>> min(t2.repeat(number=1))
0.012988805770874023

In the first case, all the intermediate calculations are done using a 
million digit long int, in the second case it is not.

[...]
> I can't think
> of any situation where you couldn't convert from one form to the other
> with just a star or a pair of parentheses.

Of course you can convert, but consider that this is doing a conversion. 
Perhaps that's unnecessary work for your specific function? You are 
packing and unpacking a sequence into a tuple. Whether this is a good 
thing or a bad thing depends on the function.


> Is there a generally accepted convention for which method to use? Is
> there ever actually a big difference between the two that I'm not
> seeing?

If you think of the function as operating on a single argument which is a 
sequence of arbitrary length, then it is best written to take a single 
sequence argument.

If you think of the function as operating on an arbitrary number of 
arguments, then it is best written to take an arbitrary number of 
arguments.

If you think it doesn't matter, then choose whichever model is less work 
for you.

If neither seems better than the other, then choose arbitrarily.

If you don't like the idea of making an arbitrary choice, or if your 
users complain, then support both models (if possible).


-- 
Steven


From gagsl-py2 at yahoo.com.ar  Fri Mar 19 23:21:44 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 20 Mar 2010 00:21:44 -0300
Subject: Best Way to extract Numbers from String
References: <ded7c9a6-e4b1-46f7-97ca-fd66708f7443@g1g2000pre.googlegroups.com>
Message-ID: <op.u9ujmivrx6zn5v@lepton.softlabbsas.com.ar>

En Sat, 20 Mar 2010 00:04:08 -0300, Jimbo <nilly16 at yahoo.com> escribi?:

> I am trying to grab some numbers from a string containing HTML text.
> Can you suggest any good functions that I could use to do this? What
> would be the easiest way to extract the following numbers from this
> string...
>
> My String has this layout & I have commented what I want to grab:
> [CODE] """</th>
> 				<td class="last">43.200 </td>
> 				<td class="change indicator" nowrap>0.040 </td>
>
>                                                    <td>43.150 </td> #
> I need to grab this number only
> 				<td>43.200 </td>
>                                                    <td>43.130 </td> #
> I need to grab this number only

I'd use BeautifulSoup [1] to handle bad formed HTML like that.

[1] http://www.crummy.com/software/BeautifulSoup/

-- 
Gabriel Genellina



From python at mrabarnett.plus.com  Fri Mar 19 23:38:27 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 20 Mar 2010 03:38:27 +0000
Subject: Simple lock
In-Reply-To: <op.u9ui2kxtx6zn5v@lepton.softlabbsas.com.ar>
References: <9fca30bd-8dd1-4952-a53d-88f44ec2e3ab@z4g2000yqa.googlegroups.com>	<4BA4337B.6050301@mrabarnett.plus.com>
	<op.u9ui2kxtx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <4BA44333.8010308@mrabarnett.plus.com>

Gabriel Genellina wrote:
> En Fri, 19 Mar 2010 23:31:23 -0300, MRAB <python at mrabarnett.plus.com> 
> escribi?:
>> moerchendiser2k3 wrote:
> 
>>>  class SetPointer
>>> {
>>> private:
>>>     void *ptr;
>>>      MY_LOCK lock;
>>>   public:
>>>     void SetPointer(void *p)
>>>     {
>>>         Lock(this->lock);
>>>         this->ptr = p;
>>>     }
> 
>> 3. You're locking, but never unlocking. The sequence should be: lock, do
>> stuff, unlock.
> 
> Just FYI: C++ doesn't have try/finally, and such behavior is usually 
> emulated using a local object. When it goes out of scope, it is 
> automatically destroyed, meaning that the object destructor is called. 
> Whatever you would write in a "finally" clause, in C++ goes into a 
> destructor.
> 
> Of course C++ guys would never say they're "emulating" try/finally, 
> instead they declare RAII as *the* Only and Right Way :)
> 
Lock() doesn't look like a declaration, but a function call (although
it's been a while since I last did C++!).

In the past I've written some C++ code where try..finally... would've
been useful... *sigh*


From alfps at start.no  Sat Mar 20 00:15:08 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Sat, 20 Mar 2010 05:15:08 +0100
Subject: Simple lock
In-Reply-To: <mailman.1000.1269056309.23598.python-list@python.org>
References: <9fca30bd-8dd1-4952-a53d-88f44ec2e3ab@z4g2000yqa.googlegroups.com>	<4BA4337B.6050301@mrabarnett.plus.com>	<op.u9ui2kxtx6zn5v@lepton.softlabbsas.com.ar>
	<mailman.1000.1269056309.23598.python-list@python.org>
Message-ID: <ho1i4f$7vt$1@news.eternal-september.org>

* MRAB:
> Gabriel Genellina wrote:
>> En Fri, 19 Mar 2010 23:31:23 -0300, MRAB <python at mrabarnett.plus.com> 
>> escribi?:
>>> moerchendiser2k3 wrote:
>>
>>>>  class SetPointer
>>>> {
>>>> private:
>>>>     void *ptr;
>>>>      MY_LOCK lock;
>>>>   public:
>>>>     void SetPointer(void *p)
>>>>     {
>>>>         Lock(this->lock);
>>>>         this->ptr = p;
>>>>     }
>>
>>> 3. You're locking, but never unlocking. The sequence should be: lock, do
>>> stuff, unlock.
>>
>> Just FYI: C++ doesn't have try/finally, and such behavior is usually 
>> emulated using a local object. When it goes out of scope, it is 
>> automatically destroyed, meaning that the object destructor is called. 
>> Whatever you would write in a "finally" clause, in C++ goes into a 
>> destructor.
>>
>> Of course C++ guys would never say they're "emulating" try/finally, 
>> instead they declare RAII as *the* Only and Right Way :)
>>
> Lock() doesn't look like a declaration, but a function call (although
> it's been a while since I last did C++!).

Right. But the OP is clearly a beginner who has yet to learn conventions (like 
all uppercase reserved for macros) and good versus bad programming constructs 
(like using void*), and who is even confusing C++ with Python. So it might just 
be that 'Lock' is a macro, and then it can expand to anything.


> In the past I've written some C++ code where try..finally... would've
> been useful... *sigh*

Check out Marginean and Alexandrescu's ScopeGuard. Old DDJ-article. For MSVC you 
may want to change use of __LINE__ in that code, to MS-specific __COUNTER__.

Fwiw. I can't remember ever needing 'finally' in C++ code.

It indicates a lack of encapsulation of entitites that should clean up 
themselves. Simple smart pointers etc. can help. E.g., check out Boost library.


Cheers & hth., even if a little off-topic,

- Alf


From kse.listed.co1 at gmail.com  Sat Mar 20 00:18:15 2010
From: kse.listed.co1 at gmail.com (Naeem)
Date: Fri, 19 Mar 2010 21:18:15 -0700 (PDT)
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" 
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Message-ID: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>

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From aahz at pythoncraft.com  Sat Mar 20 00:39:38 2010
From: aahz at pythoncraft.com (Aahz)
Date: 19 Mar 2010 21:39:38 -0700
Subject: (updated) Choosing a collection of common modules/packages for a
	general purpose    reusable PY2EXE runtime
References: <1268143741.31835.1363885481@webmail.messagingengine.com>
	<mailman.491.1268144871.23598.python-list@python.org>
Message-ID: <ho1jia$2pb$1@panix3.panix.com>

In article <mailman.491.1268144871.23598.python-list at python.org>,
 <python at bdurham.com> wrote:
>
>We've decided to build a re-usable *general purpose* PY2EXE "runtime"
>that can be shared by a number of scripts vs. distributing a monolithic
>EXE for each of our scripts.

It's not clear what the purpose of this is.  You can build several
scripts against the same py2exe backend.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From Brian.Mingus at Colorado.EDU  Sat Mar 20 00:41:42 2010
From: Brian.Mingus at Colorado.EDU (Brian J Mingus)
Date: Fri, 19 Mar 2010 22:41:42 -0600
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" 
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN 
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
Message-ID: <9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com>

On Fri, Mar 19, 2010 at 10:18 PM, Naeem <kse.listed.co1 at gmail.com> wrote:

> "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY
> FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com       "SEXY
> RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS"
> "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE"
> "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
> --
> http://mail.python.org/mailman/listinfo/python-list
>


Guys, I know it is a lot of work to moderate a large mailing list. But
still, with so many of us surely we can pull it off?
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From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 20 02:23:14 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 20 Mar 2010 06:23:14 GMT
Subject: Writing tests for the Python bug tracker
Message-ID: <4ba469d2$0$27838$c3e8da3@news.astraweb.com>

I have two reported bugs in the bug tracker waiting on tests:

http://bugs.python.org/issue8128
http://bugs.python.org/issue4037

Are there any guidelines for writing tests for the standard library and 
language? I've googled, but found nothing useful: lots of guidelines for 
writing tests, and of course I've read PEP 8, but I'm not sure if there 
are conventions for tests I'm missing.



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 20 02:52:08 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 20 Mar 2010 06:52:08 GMT
Subject: Writing tests for the Python bug tracker
References: <4ba469d2$0$27838$c3e8da3@news.astraweb.com>
Message-ID: <4ba47098$0$27838$c3e8da3@news.astraweb.com>

On Sat, 20 Mar 2010 06:23:14 +0000, Steven D'Aprano wrote:

> Are there any guidelines for writing tests for the standard library and
> language? I've googled, but found nothing useful: lots of guidelines for
> writing tests, and of course I've read PEP 8, but I'm not sure if there
> are conventions for tests I'm missing.

I've found this:

http://docs.python.org/library/test.html

and I've written a small test:

$ cat test_unicode_interpolation.py
# For testing http://bugs.python.org/issue8128

import test.test_support
import unittest

class K(unicode):
    def __str__(self): return "Surprise!"

class UnicodeInterpolationTest(unittest.TestCase):
    def test_interpolation(self):
        self.assertEquals(u'%s' % K('some text'), 'Surprise!')

def test_main():
    test.test_support.run_unittest(UnicodeInterpolationTest)

if __name__ == "__main__":
    test_main()


but when I try running the test, I get an error:

$ python test_unicode_interpolation.py
Options: {'delimiter': None}
str of options.delimiter = None
repr of options.delimiter = None
len of options.delimiter
Traceback (most recent call last):
  File "test_unicode_interpolation.py", line 3, in <module>
    import test.test_support
  File "/home/steve/python/test.py", line 8, in <module>
    print "len of options.delimiter", len(options.delimiter)
TypeError: object of type 'NoneType' has no len()


What am I doing wrong?



(By the way, I'm expecting the unit test above to fail.)




-- 
Steven


From exarkun at twistedmatrix.com  Sat Mar 20 03:07:58 2010
From: exarkun at twistedmatrix.com (exarkun at twistedmatrix.com)
Date: Sat, 20 Mar 2010 07:07:58 -0000
Subject: Writing tests for the Python bug tracker
In-Reply-To: <4ba47098$0$27838$c3e8da3@news.astraweb.com>
References: <4ba469d2$0$27838$c3e8da3@news.astraweb.com>
	<4ba47098$0$27838$c3e8da3@news.astraweb.com>
Message-ID: <20100320070758.2792.893406088.divmod.xquotient.1775@localhost.localdomain>

On 06:52 am, steve at remove-this-cybersource.com.au wrote:
>
>but when I try running the test, I get an error:
>
>$ python test_unicode_interpolation.py
>Options: {'delimiter': None}
>str of options.delimiter = None
>repr of options.delimiter = None
>len of options.delimiter
>Traceback (most recent call last):
>  File "test_unicode_interpolation.py", line 3, in <module>
>    import test.test_support
>  File "/home/steve/python/test.py", line 8, in <module>
>    print "len of options.delimiter", len(options.delimiter)
>TypeError: object of type 'NoneType' has no len()
>
>
>What am I doing wrong?

Take a careful look at the stack being reported.  Then, think of a 
better name than "test" for your file.

Jean-Paul


From greg.ewing at canterbury.ac.nz  Sat Mar 20 03:32:23 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sat, 20 Mar 2010 20:32:23 +1300
Subject: to pass self or not to pass self
In-Reply-To: <b9e5729e-01f6-430d-8748-7cc7d115fc50@g19g2000yqe.googlegroups.com>
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org>
	<4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com>
	<mailman.925.1268855759.23598.python-list@python.org>
	<b9e5729e-01f6-430d-8748-7cc7d115fc50@g19g2000yqe.googlegroups.com>
Message-ID: <80jbd2Fhd3U1@mid.individual.net>

Patrick Maupin wrote:

> Actually, I think I overstated my case -- there is some special logic
> for len and built-in objects, I think.

Yes, len() invokes the C-level sq_len slot of the type object,
which for built-in types points directly to the C function
implementing the len() operation for that type. So len() on
a string doesn't involve looking up a __len__ attribute or
creating a bound method at all.

The only reason a __len__ attribute exists at all for
built-in types is to give Python code the illusion that
C-coded and Python-coded classes work the same way. Most
of the time it's never used.

If you try the same test using a method that doesn't have
a corresponding type slot (basically anything without a
double_underscore name) you will probably see a small
improvement.

-- 
Greg


From __peter__ at web.de  Sat Mar 20 04:36:22 2010
From: __peter__ at web.de (Peter Otten)
Date: Sat, 20 Mar 2010 09:36:22 +0100
Subject: logging: local functions ==> loss of lineno
References: <mailman.576.1268256192.23598.python-list@python.org>
	<hnaj9c$i0u$02$1@news.t-online.com>
	<4BA295A1.70207@hellmutweber.de>
	<mailman.972.1268995215.23598.python-list@python.org>
	<hnvqe5$vc$02$1@news.t-online.com>
	<mailman.977.1269006574.23598.python-list@python.org>
Message-ID: <ho21dt$b6v$00$1@news.t-online.com>

Jean-Michel Pichavant wrote:

> You are still accessing the private attribute of the  module logging.

Just reading it is a significantly more conservative approach than setting 
it to an object with an unusual notion of equality ;)

> My previous remark was misleading, in fact there's nothing you can do
> about it.

How about replacing logging._srcfile with fixname(logging.__file__)?

> _srcfile is not meant to be used elsewhere than in the logging module
> itself.

> However, I don't wanna sound like I'm rejecting this solution, 1st the
> OP is satisified with it and since this solution is working, it is still
> more helpful than anyone noticing that you've accessed a private
> attribute (some will successfully argue that python allows to do so).

Yeah, I had hoped that I could get away without drawing the "consenting 
adults" wildcard...
 
> At the very begining of this thread I've provided a complete different
> approach, instead of using the builtin 'filename' and 'lineno' field of
> the logging, use custom fileds with the extra parameter.
> 
> It has also some drawbacks but could be a possible alternative.

Having two filename/lineno sets ist likely to confuse.

Peter


From hawat.thufir at gmail.com  Sat Mar 20 05:17:14 2010
From: hawat.thufir at gmail.com (Thufir)
Date: Sat, 20 Mar 2010 09:17:14 GMT
Subject: google token
Message-ID: <uo0pn.52098$2r7.8254@newsfe05.iad>

I'd like to acquire a token, as below, but from Java:


    def get_token(self,force=False) :
        '''Return a tokey. A token is a special string that is used like 
a session identification, but that expire rather quickly.'''
        if ( force or (self._token == None) ) :
            feedurl = CONST.URI_PREFIXE_API + CONST.API_TOKEN + '?
client=' + CONST.AGENT
            # print feedurl
            self._token = self._web.get(feedurl)
        return self._token


http://pyrfeed.googlecode.com/svn/trunk/lib/GoogleReader/reader.py


Basically, that's just a GET on a particular URL, and the returned string 
is saved as _token?


thanks,

Thufir



From stefan_ml at behnel.de  Sat Mar 20 05:44:39 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sat, 20 Mar 2010 10:44:39 +0100
Subject: C-API PyObject_Call
In-Reply-To: <7597f6a5-5fe0-4a69-9f9b-f0d96f4499d1@g26g2000yqn.googlegroups.com>
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>	<mailman.849.1268756405.23598.python-list@python.org>	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>	<mailman.858.1268759662.23598.python-list@python.org>	<c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>	<mailman.883.1268808393.23598.python-list@python.org>	<3592cca0-2a4a-4a19-9e10-d80936e6d200@upsg2000gro.googlegroups.com>	<mailman.943.1268899999.23598.python-list@python.org>	<793e5934-bc1b-4023-aa0e-bf6d956177fd@f8g2000yqn.googlegroups.com>	<mailman.956.1268930626.23598.python-list@python.org>	<fd5b82be-b56c-4024-ad3b-b1a53698cf1f@r27g2000yqn.googlegroups.com>	<mailman.978.1269007923.23598.python-list@python.org>
	<7597f6a5-5fe0-4a69-9f9b-f0d96f4499d1@g26g2000yqn.googlegroups.com>
Message-ID: <ho25e7$hvv$1@dough.gmane.org>

moerchendiser2k3, 20.03.2010 03:01:
> Yes, the user is able to set a file which contains a function that
> does what the user wants.
 > But in a case, I expect a special return value of this function.

Ah, ok, that was the important piece of information that you omitted from 
your previous posts. So what you actually do is call a user provided 
function and you want to report errors back to the user if the function 
does not behave as expected by the (plugin) interface, and not only when it 
raises an exception itself.

You might want to read this:

http://catb.org/~esr/faqs/smart-questions.html


> So, I need to tell him, in which file/line the error occured,
> otherwise he dont know where to look.
>
> Imagine he set 20 files, and all of them have implemented a special
> function. So he wouldnt know where to check for the error.

Well, you can easily get at the module file path and the function name 
through introspection of the function, just as you would in Python. That 
should be enough information to present to the user. I don't see why you 
would want to add the exact line number of the return statement. The inner 
workings of the user function you call are up to the user, after all.

Again, take a look at Cython, where you can do the introspection in Python 
code.

Stefan



From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 20 05:53:33 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 20 Mar 2010 09:53:33 GMT
Subject: Writing tests for the Python bug tracker
References: <4ba469d2$0$27838$c3e8da3@news.astraweb.com>
	<4ba47098$0$27838$c3e8da3@news.astraweb.com>
	<mailman.1002.1269068899.23598.python-list@python.org>
Message-ID: <4ba49b1d$0$27838$c3e8da3@news.astraweb.com>

On Sat, 20 Mar 2010 07:07:58 +0000, exarkun wrote:

>>What am I doing wrong?
> 
> Take a careful look at the stack being reported.  Then, think of a
> better name than "test" for your file.

Doh! *face-palm*

I was shadowing the test package with a long forgotten test module.


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 20 06:12:40 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 20 Mar 2010 10:12:40 GMT
Subject: google token
References: <uo0pn.52098$2r7.8254@newsfe05.iad>
Message-ID: <4ba49f98$0$27838$c3e8da3@news.astraweb.com>

On Sat, 20 Mar 2010 09:17:14 +0000, Thufir wrote:

> I'd like to acquire a token, as below, but from Java:

Perhaps you should be asking a Java discussion group? This group is for 
discussing Python.


-- 
Steven


From dickinsm at gmail.com  Sat Mar 20 06:56:51 2010
From: dickinsm at gmail.com (Mark Dickinson)
Date: Sat, 20 Mar 2010 03:56:51 -0700 (PDT)
Subject: Writing tests for the Python bug tracker
References: <4ba469d2$0$27838$c3e8da3@news.astraweb.com>
Message-ID: <556adeb4-ac03-4dfe-92a5-814821fd5bfb@z4g2000yqa.googlegroups.com>

On Mar 20, 6:23?am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> I have two reported bugs in the bug tracker waiting on tests:
>
> http://bugs.python.org/issue8128http://bugs.python.org/issue4037
>
> Are there any guidelines for writing tests for the standard library and
> language?

Not that I can think of, beyond those you've already mentioned.  I
mostly just copy the style of existing tests (though there are
definitely some test_*** files that aren't particularly well written).

For quick questions, you might get good answers by asking on the
#python-dev freenode IRC channel:  a good few of the people interested
in testing (esp. Michael Foord, Ezio Melotti) can often be found
there.

--
Mark


From dickinsm at gmail.com  Sat Mar 20 07:00:31 2010
From: dickinsm at gmail.com (Mark Dickinson)
Date: Sat, 20 Mar 2010 04:00:31 -0700 (PDT)
Subject: Writing tests for the Python bug tracker
References: <4ba469d2$0$27838$c3e8da3@news.astraweb.com>
	<4ba47098$0$27838$c3e8da3@news.astraweb.com>
Message-ID: <218770fd-9928-4dfd-9c9c-6fdecbafbaee@k17g2000yqb.googlegroups.com>

On Mar 20, 6:52?am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> I've found this:
>
> http://docs.python.org/library/test.html
>
> and I've written a small test:
>
> $ cat test_unicode_interpolation.py
> # For testinghttp://bugs.python.org/issue8128
>
> import test.test_support
> import unittest
>
> class K(unicode):
> ? ? def __str__(self): return "Surprise!"
>
> class UnicodeInterpolationTest(unittest.TestCase):
> ? ? def test_interpolation(self):
> ? ? ? ? self.assertEquals(u'%s' % K('some text'), 'Surprise!')
>
> def test_main():
> ? ? test.test_support.run_unittest(UnicodeInterpolationTest)
>
> if __name__ == "__main__":
> ? ? test_main()

This looks like a fine start to me.  I have a feeling that the current
fashion is for assertEqual rather than assertEquals, but I might be
wrong.  :)

--
Mark


From chambon.pascal at gmail.com  Sat Mar 20 07:31:47 2010
From: chambon.pascal at gmail.com (Pascal Chambon)
Date: Sat, 20 Mar 2010 12:31:47 +0100
Subject: Precedence of py, pyd, so, egg, and folder modules/packages when
	importing
Message-ID: <4BA4B223.90207@gmail.com>

Hello,

I've run into a slight issue when turning my package hierarchy into a 
parallel hierarchy of compiled cython extensions. Fue to the compilation 
process, pure python and C modules must have the basename, and they're 
located in the same folders.

Is there any way for me to ensure that, if both modules sets are 
installed by an user, the compiled, faster module will ALWAYS be 
imported instead of the pure python one ? Or am I forced to remove 
pure-python sources when cython ones must be used ?

More generally, is there any certainty about the precedence of the misc. 
module types, when several of them are in the same path ? I have found 
nothing about it online.

Thanks for the attention,
regards,
Pascal


From news1234 at free.fr  Sat Mar 20 08:16:08 2010
From: news1234 at free.fr (News123)
Date: Sat, 20 Mar 2010 13:16:08 +0100
Subject: accessing variable of the __main__ module
Message-ID: <4ba4bc88$0$29961$426a74cc@news.free.fr>

Hi,


I wondered about the best way, that a  module's function could determine
the existance and value of variables in the __main__ module.


What I came up with is:
########### main.py ##########
import mod
A = 4
if __name__ == "__main__": mod.f()
########### mod.py ##########
def f():
    try:
        from __main__ import A
    except ImportError as e:
        A = "does not exist"
    print "__main__.A" ,A

Is there anything better / more pythonic?

Thanks in advance and bye


N


From python at bdurham.com  Sat Mar 20 08:46:49 2010
From: python at bdurham.com (python at bdurham.com)
Date: Sat, 20 Mar 2010 08:46:49 -0400
Subject: (updated) Choosing a collection of common modules/packages for a 
	general purpose    reusable PY2EXE runtime
In-Reply-To: <ho1jia$2pb$1@panix3.panix.com>
References: <1268143741.31835.1363885481@webmail.messagingengine.com><mailman.491.1268144871.23598.python-list@python.org>
	<ho1jia$2pb$1@panix3.panix.com>
Message-ID: <1269089209.14921.1365809185@webmail.messagingengine.com>

Aahz,

>> We've decided to build a re-usable *general purpose* PY2EXE "runtime"
>> that can be shared by a number of scripts vs. distributing a monolithic
>> EXE for each of our scripts.

> It's not clear what the purpose of this is. You can build several 
> scripts against the same py2exe backend.

Yes you can, but with our technique we only build and distribute our
py2exe backend *once*.

Our goal was to build a custom Python runtime that we could build and
deploy once and then augment with the many scripts we distribute and
update. By including the full Python standard library (minus non-Windows
and certain deprecated modules) and a few additional 3rd party
modules/packages (win32, wmi, jsonpickle, etc) our script distribution
has become significantly easier, faster and more robust - especially for
scripts that may make dynamic module imports missed by py2exe. Script
updates are incredibly fast because our clients only download the
scripts themselves (packaged as standalone zip files). Not that disk
space is a concern any more, but our client footprint is significantly
smaller without every script being a single file exe.

I recognize that this technique might not work for everyone, but it has
worked out extremely well for us.

Malcolm



----- Original message -----
From: "Aahz" <aahz at pythoncraft.com>
To: python-list at python.org
Date: 19 Mar 2010 21:39:38 -0700
Subject: Re: (updated) Choosing a collection of common modules/packages
for a   general purpose    reusable PY2EXE runtime

In article <mailman.491.1268144871.23598.python-list at python.org>,
 <python at bdurham.com> wrote:
>
>We've decided to build a re-usable *general purpose* PY2EXE "runtime"
>that can be shared by a number of scripts vs. distributing a monolithic
>EXE for each of our scripts.

It's not clear what the purpose of this is.  You can build several
scripts against the same py2exe backend.
-- 
Aahz (aahz at pythoncraft.com)           <*>        
http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and
promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer
-- 
http://mail.python.org/mailman/listinfo/python-list



From alfps at start.no  Sat Mar 20 08:47:41 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Sat, 20 Mar 2010 13:47:41 +0100
Subject: accessing variable of the __main__ module
In-Reply-To: <4ba4bc88$0$29961$426a74cc@news.free.fr>
References: <4ba4bc88$0$29961$426a74cc@news.free.fr>
Message-ID: <ho2g5h$jfo$1@news.eternal-september.org>

* News123:
> 
> I wondered about the best way, that a  module's function could determine
> the existance and value of variables in the __main__ module.
> 
> 
> What I came up with is:
> ########### main.py ##########
> import mod
> A = 4
> if __name__ == "__main__": mod.f()
> ########### mod.py ##########
> def f():
>     try:
>         from __main__ import A
>     except ImportError as e:
>         A = "does not exist"
>     print "__main__.A" ,A
> 
> Is there anything better / more pythonic?

I don't know if this is what you're after, because it's design level instead of 
technical-Python level. But consider the knowledge distribution above. I see it 
as like a doctor (main program) telling a nurse (mod.f) to please do something 
for which the nurse would require some ImportantFact, which the good doctor 
absent-mindedly forgets to tell the nurse. Trying to do as told the nurse 
discovers that she needs the ImportantFact, and knowing that it might be 
available in one of the doctor's files she breaks into his office, finds the PC 
up and running with the doctor logged in, hurray!, and starts looking...

I think the doctor should just give the nurse the ImportantFact right away, not 
be so absent-minded and unavailable for query later.

And I think that if the nurse isn't told the ImportantFact and discovers that 
she needs it to do what she's told, then the proper thing to do is not to break 
into the doctor's office and go browsing in his files to possibly find what she 
needs. For example, she might instead raise an exception. Don't know how they do 
that in hospitals, though.


Cheers & hth.,

- Alf


From luismgz at gmail.com  Sat Mar 20 08:51:25 2010
From: luismgz at gmail.com (=?ISO-8859-1?Q?Luis_M=2E_Gonz=E1lez?=)
Date: Sat, 20 Mar 2010 05:51:25 -0700 (PDT)
Subject: Best Way to extract Numbers from String
References: <ded7c9a6-e4b1-46f7-97ca-fd66708f7443@g1g2000pre.googlegroups.com>
Message-ID: <c0f554a5-2407-40ff-9828-50e56b223d43@r1g2000yqj.googlegroups.com>

On Mar 20, 12:04?am, Jimbo <nill... at yahoo.com> wrote:
> Hello
>
> I am trying to grab some numbers from a string containing HTML text.
> Can you suggest any good functions that I could use to do this? What
> would be the easiest way to extract the following numbers from this
> string...
>
> My String has this layout & I have commented what I want to grab:
> [CODE] """</th>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="last">43.200 </td>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="change indicator" nowrap>0.040 </td>
>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?<td>43.150 </td> #
> I need to grab this number only
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td>43.200 </td>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?<td>43.130 </td> #
> I need to grab this number only
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td>43.290 </td> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td>43.100 </td> # I need to
> grab this number only
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td>7,450,447 </td>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="middle"><a
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? href="/asx/markets/optionPrices.do?
> by=underlyingCode&underlyingCode=BHP&expiryDate=&optionType=">Options</
> a></td>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="middle"><a
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? href="/asx/markets/warrantPrices.do?
> by=underlyingAsxCode&underlyingCode=BHP">Warrants & Structured
> Products</a></td>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="middle"><a
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? href="/asx/markets/cfdPrices.do?
> by=underlyingAsxCode&underlyingCode=BHP">CFDs</a></td>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="middle"><a href="http://hfgapps.hubb.com/asxtools/
> Charts.aspx?
> TimeFrame=D6&compare=comp_index&indicies=XJO&pma1=20&pma2=20&asxCode=BHP">< img
> src="/images/chart.gif" border="0" height="15" width="15"></a>
> </td>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td><a href="/research/announcements/status_notes.htm#XD">XD</a>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? </td>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td><a href="/asx/statistics/announcements.do?
> by=asxCode&asxCode=BHP&timeframe=D&period=W">Recent</a>
> </td>
> ? ? ? ? ? ? ? ? ? ? ? ? </tr>"""[/CODE]


You should use BeautifulSoup or perhaps regular expressions.
Or if you are not very smart, lik me, just try a brute force approach:

>>> for i in s.split('>'):
	for e in i.split():
		if '.' in e and e[0].isdigit():
			print (e)


43.200
0.040
43.150
43.200
43.130
43.290
43.100
>>>


From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 20 09:05:41 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 20 Mar 2010 13:05:41 GMT
Subject: accessing variable of the __main__ module
References: <4ba4bc88$0$29961$426a74cc@news.free.fr>
Message-ID: <4ba4c824$0$27838$c3e8da3@news.astraweb.com>

On Sat, 20 Mar 2010 13:16:08 +0100, News123 wrote:

> Hi,
> 
> 
> I wondered about the best way, that a  module's function could determine
> the existance and value of variables in the __main__ module.
> 
> 
> What I came up with is:
> ########### main.py ##########
> import mod
> A = 4
> if __name__ == "__main__": mod.f()
> ########### mod.py ##########
> def f():
>     try:
>         from __main__ import A
>     except ImportError as e:
>         A = "does not exist"
>     print "__main__.A" ,A
> 
> Is there anything better / more pythonic?


First problem:

You try to import from "__main__", but the other module is called "main". 
__main__ is a special name, which Python understands as meaning "this 
module that you are in now". For example:

$ cat test_main.py
x = "something special"
import __main__  # magic alias for this module
print __main__.x

$ python test_main.py
something special

So inside "mod.py", the line "from __main__ import A" tries to import A 
from mod.py, not from main.py. You need to say "from main import A" 
instead.

But if you do this, it creates a second problem: you have a circular 
import, which is generally considered a Bad Thing. The problem is that:

(1) module main tries to import module mod
(2) module mod tries to import module main
(3) but main is still waiting for mod to be imported

Now, in your case you escape that trap, because the import is inside a 
function, so it doesn't occur until you call the function. But it is 
still considered poor practice: it is best to avoid circular imports 
unless you really, really need them.


The question is, why does module mod.py care what is happening in 
main.py? It is better for mod.py to be self-contained, and not care about 
main.py at all. If it needs A, let the caller pass A to it:

########### main.py ##########
import mod
A = 4
if __name__ == "__main__":
    mod.f(__name__, A)

########### mod.py ##########
def f(caller, A):
    print "%s.A: %s" % (caller, A)



-- 
Steven


From news1234 at free.fr  Sat Mar 20 09:32:03 2010
From: news1234 at free.fr (News123)
Date: Sat, 20 Mar 2010 14:32:03 +0100
Subject: accessing variable of the __main__ module
In-Reply-To: <4ba4c824$0$27838$c3e8da3@news.astraweb.com>
References: <4ba4bc88$0$29961$426a74cc@news.free.fr>
	<4ba4c824$0$27838$c3e8da3@news.astraweb.com>
Message-ID: <4ba4ce53$0$28677$426a34cc@news.free.fr>

Hi Steven,








Steven D'Aprano wrote:
> On Sat, 20 Mar 2010 13:16:08 +0100, News123 wrote:
> 
>> Hi,
>>
>>
>> I wondered about the best way, that a  module's function could determine
>> the existance and value of variables in the __main__ module.
>>
>>
>> What I came up with is:
>> ########### main.py ##########
>> import mod
>> A = 4
>> if __name__ == "__main__": mod.f()
>> ########### mod.py ##########
>> def f():
>>     try:
>>         from __main__ import A
>>     except ImportError as e:
>>         A = "does not exist"
>>     print "__main__.A" ,A
>>
>> Is there anything better / more pythonic?
> 
> 
> First problem:
> 
> You try to import from "__main__", but the other module is called "main". 
> __main__ is a special name, which Python understands as meaning "this 
> module that you are in now". For example:
My choice of names was perhaps not very smart.
I could have called main.py also mytoplevel.py


> 
> $ cat test_main.py
> x = "something special"
> import __main__  # magic alias for this module
> print __main__.x
> 
> $ python test_main.py
> something special
> 
> So inside "mod.py", the line "from __main__ import A" tries to import A 
> from mod.py, not from main.py. You need to say "from main import A" 
> instead.
> 
I think you're wrong, my above code seems to work.
__main__  refers not to the current module, but to the urrent
'top-level-module'
so
from __main__ import A tries to import from the top level module which
is in my case main.py.


> But if you do this, it creates a second problem: you have a circular 
> import, which is generally considered a Bad Thing. The problem is that:
> 
> (1) module main tries to import module mod
> (2) module mod tries to import module main
> (3) but main is still waiting for mod to be imported
> 
> Now, in your case you escape that trap, because the import is inside a 
> function, so it doesn't occur until you call the function. But it is 
> still considered poor practice: it is best to avoid circular imports 
> unless you really, really need them.
> 
> 
> The question is, why does module mod.py care what is happening in 
> main.py? It is better for mod.py to be self-contained, and not care about 
> main.py at all. If it needs A, let the caller pass A to it:


The reason is pure lazyness.
I would like to 'try' something quickly.

I have a module used by many different python programs.

In case the __main__  module contains a certain object I'd like to
extract information from this object if not not.

This is for debug, not for 'production'.

I'd prefer to change only one file and not many.


> 
> ########### main.py ##########
> import mod
> A = 4
> if __name__ == "__main__":
>     mod.f(__name__, A)
> 
> ########### mod.py ##########
> def f(caller, A):
>     print "%s.A: %s" % (caller, A)
> 
> 
> 

N


From news1234 at free.fr  Sat Mar 20 09:38:43 2010
From: news1234 at free.fr (News123)
Date: Sat, 20 Mar 2010 14:38:43 +0100
Subject: why is there now execption for windows? trying to listen twice to
	the same port
Message-ID: <4ba4cfe3$0$7060$426a74cc@news.free.fr>

I'm having a small multiprocessing manager:

# ##########################
import socket,sys
from multiprocessing.managers import BaseManager

mngr = BaseManager(address=('127.0.0.1',8089),authkey='verysecret')
try:
    srvr = mngr.get_server()
except socket.error as e:
    print "probably address already in use"
    sys.exit()
print "serving"
srvr.serve_forever()


Under linux this script can only be run once.
The second call will raise an exception, as the previous program is
already listening to pot 8089.


Under Windows however the program can be started twice.
and will print twice "serving". This surprises me

Howver only one of them will successfully listen and respond to
connections, but I don't get an exception.

Is this to be expected?

I'd like to be sure, that the manager is only started once and that it
can be started anytime it's not up.


N


From gatoygata2 at gmail.com  Sat Mar 20 09:54:53 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Sat, 20 Mar 2010 06:54:53 -0700 (PDT)
Subject: How User-defined method objects are created?
Message-ID: <cf27c64f-ea5a-428c-898c-88d7eb748422@q23g2000yqd.googlegroups.com>

I'm trying to understand the description of method object creation in
the python 2.6 language reference (3.2. The standard type hierarchy)
with little success. The points knocking me are:

"User-defined method objects may be created when getting an attribute
of a class (perhaps via an instance of that class), if that attribute
is a user-defined function object, an unbound user-defined method
object, or a class method object. When the attribute is a user-defined
method object, a new method object is only created if the class from
which it is being retrieved is the same as, or a derived class of, the
class stored in the original method object; otherwise, the original
method object is used as it is."

It is a bit of a tongue-twister for me. What the last sentence means?
Please, I beg for a simple example of the different objects (user
defined function, user defined method, class method) refered.
Are maybe the refered objects exemplified by :

#python 3.1
class Klass():

	def met(self):
		print('method')

       def func():
		print('function')

       @classmethod
	def kmet(klass):
		print('classmethod')

or it is talking about another thing?
What is the difference with python 3 where there is no mention to the
unbound user-defined method object (same section in python 3 language
reference):

"User-defined method objects may be created when getting an attribute
of a class (perhaps via an instance of that class), if that attribute
is a user-defined function object or a class method object."

I'm trying to learn, however the task is revealing as an enormous
undertaking :-)

JA




From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 20 10:04:41 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 20 Mar 2010 14:04:41 GMT
Subject: accessing variable of the __main__ module
References: <4ba4bc88$0$29961$426a74cc@news.free.fr>
	<4ba4c824$0$27838$c3e8da3@news.astraweb.com>
	<4ba4ce53$0$28677$426a34cc@news.free.fr>
Message-ID: <4ba4d5f9$0$27838$c3e8da3@news.astraweb.com>

On Sat, 20 Mar 2010 14:32:03 +0100, News123 wrote:

>> You try to import from "__main__", but the other module is called
>> "main". __main__ is a special name, which Python understands as meaning
>> "this module that you are in now". For example:
>
> My choice of names was perhaps not very smart. I could have called
> main.py also mytoplevel.py
[...]
> I think you're wrong, my above code seems to work. __main__  refers not
> to the current module, but to the urrent 'top-level-module'
> so
> from __main__ import A tries to import from the top level module which
> is in my case main.py.

Hmmm... it looks like you are correct and I made a mistake.

This isn't something that the documentation is clear about, but here are 
a set of test files:


$ cat A.py
import __main__
import B
print __main__, B, B.__main__

$ cat B.py
import __main__

$ python A.py
<module '__main__' from 'A.py'> <module 'B' from '/home/steve/python/
B.pyc'> <module '__main__' from 'A.py'>


Here is the documentation:

http://docs.python.org/library/__main__.html

which is pretty sparse.



-- 
Steven


From irmen.NOSPAM at xs4all.nl  Sat Mar 20 10:17:50 2010
From: irmen.NOSPAM at xs4all.nl (Irmen de Jong)
Date: Sat, 20 Mar 2010 15:17:50 +0100
Subject: why is there now execption for windows? trying to listen twice
	to the same port
In-Reply-To: <4ba4cfe3$0$7060$426a74cc@news.free.fr>
References: <4ba4cfe3$0$7060$426a74cc@news.free.fr>
Message-ID: <4ba4d910$0$22939$e4fe514c@news.xs4all.nl>

On 20-3-2010 14:38, News123 wrote:
> I'm having a small multiprocessing manager:
>
> # ##########################
> import socket,sys
> from multiprocessing.managers import BaseManager
>
> mngr = BaseManager(address=('127.0.0.1',8089),authkey='verysecret')
> try:
>      srvr = mngr.get_server()
> except socket.error as e:
>      print "probably address already in use"
>      sys.exit()
> print "serving"
> srvr.serve_forever()
>
>
> Under linux this script can only be run once.
> The second call will raise an exception, as the previous program is
> already listening to pot 8089.
>
>
> Under Windows however the program can be started twice.
> and will print twice "serving". This surprises me


My guess is that somewhere in the multiprocessing package the SO_REUSEADDR option is 
used on the socket. And that option has different semantics on Windows than it has on 
other operating systems. At least one of them being the possibility of multiple bindings 
on the same port without getting an error.
See http://bugs.python.org/issue2550.
Also see the code comments to bind_port in Lib/test/test_support.py, that suggests using 
SO_EXCLUSIVEADDRUSE instead under Windows, but that is not much use to you unless you 
monkeypatch the multiprocessing package code.

Hope this helps
-irmen



From davea at ieee.org  Sat Mar 20 10:50:17 2010
From: davea at ieee.org (Dave Angel)
Date: Sat, 20 Mar 2010 09:50:17 -0500
Subject: accessing variable of the __main__ module
In-Reply-To: <4ba4ce53$0$28677$426a34cc@news.free.fr>
References: <4ba4bc88$0$29961$426a74cc@news.free.fr>	<4ba4c824$0$27838$c3e8da3@news.astraweb.com>
	<4ba4ce53$0$28677$426a34cc@news.free.fr>
Message-ID: <4BA4E0A9.3050804@ieee.org>

News123 wrote:
>
> Steven D'Aprano wrote:
>   
>> <snip>
>> Now, in your case you escape that trap, because the import is inside a 
>> function, so it doesn't occur until you call the function. But it is 
>> still considered poor practice: it is best to avoid circular imports 
>> unless you really, really need them.
>>
>>
>> The question is, why does module mod.py care what is happening in 
>> main.py? It is better for mod.py to be self-contained, and not care about 
>> main.py at all. If it needs A, let the caller pass A to it:
>>     
>
>
> The reason is pure lazyness.
> I would like to 'try' something quickly.
>
> I have a module used by many different python programs.
>
> In case the __main__  module contains a certain object I'd like to
> extract information from this object if not not.
>
> This is for debug, not for 'production'.
>
> I'd prefer to change only one file and not many.
>
>
>   
First, the practical response:  yes, it'll work, and if this is really 
for debug, it's fine.   However, realize that many times "debug things" 
make it into the wild.

Any time recursion of imports occurs, it's a sign of trouble.  And doing 
it right isn't usually much harder than studying the hazards of the 
recursion.

In the particular case you're doing, I think there are at least three 
better solutions:

1) Pass A as an argument to a function call, for example   f(A).
2) Put A into a separate module that both main.py and mod.py import
3) Explicitly add A to mod.py's global space.     mod.A = A   written in 
main.py,  before calling the function mod.x().

HTH
DaveA



From news1234 at free.fr  Sat Mar 20 10:52:05 2010
From: news1234 at free.fr (News123)
Date: Sat, 20 Mar 2010 15:52:05 +0100
Subject: why is there now execption for windows? trying to listen twice
	to the same port
In-Reply-To: <4ba4d910$0$22939$e4fe514c@news.xs4all.nl>
References: <4ba4cfe3$0$7060$426a74cc@news.free.fr>
	<4ba4d910$0$22939$e4fe514c@news.xs4all.nl>
Message-ID: <4ba4e115$0$18400$426a74cc@news.free.fr>

Hi Irmen,


Irmen de Jong wrote:
> On 20-3-2010 14:38, News123 wrote:
>> I'm having a small multiprocessing manager:
>>
>> # ##########################
>> import socket,sys
>> from multiprocessing.managers import BaseManager
>>
>> mngr = BaseManager(address=('127.0.0.1',8089),authkey='verysecret')
>> try:
>>      srvr = mngr.get_server()
>> except socket.error as e:
>>      print "probably address already in use"
>>      sys.exit()
>> print "serving"
>> srvr.serve_forever()
>>
>> Under Windows however the program can be started twice.
>> and will print twice "serving". This surprises me
> 
> 
> My guess is that somewhere in the multiprocessing package the
> SO_REUSEADDR option is used on the socket. And that option has different
> semantics on Windows than it has on other operating systems. At least
> one of them being the possibility of multiple bindings on the same port
> without getting an error.
> See http://bugs.python.org/issue2550.
> Also see the code comments to bind_port in Lib/test/test_support.py,
> that suggests using SO_EXCLUSIVEADDRUSE instead under Windows, but that
> is not much use to you unless you monkeypatch the multiprocessing
> package code.
> 

Yes this might be.


Then I think, that I should report it either as bug / enhancement
request. However I am not at all aware of the issue reporting process
concerning python. (special site / module developer, PEP . . . )

For the short term:
I wonder now how to solve my problem that only one manager is started
and the second one should just aborts.

Some days ago I started a discussion in the thread
"how to start a python script only once".
I hoped, that the listening socket of the manager would just take care
of the issue.

N









From duncan.booth at invalid.invalid  Sat Mar 20 12:24:37 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 20 Mar 2010 16:24:37 GMT
Subject: How User-defined method objects are created?
References: <cf27c64f-ea5a-428c-898c-88d7eb748422@q23g2000yqd.googlegroups.com>
Message-ID: <Xns9D41A6EC8DEA0duncanbooth@127.0.0.1>

Joaquin Abian <gatoygata2 at gmail.com> wrote:

> "User-defined method objects may be created when getting an attribute
> of a class (perhaps via an instance of that class), if that attribute
> is a user-defined function object, an unbound user-defined method
> object, or a class method object. When the attribute is a user-defined
> method object, a new method object is only created if the class from
> which it is being retrieved is the same as, or a derived class of, the
> class stored in the original method object; otherwise, the original
> method object is used as it is."
> 
> It is a bit of a tongue-twister for me. What the last sentence means?
> Please, I beg for a simple example of the different objects (user
> defined function, user defined method, class method) refered.

>>> class A(object):
	def foo(self): pass

	
>>> class B(object):
	def bar(self): pass

	
>>> B.baz = B.bar
>>> B.foo = A.foo
>>> instance = B()
>>> B.foo
<unbound method A.foo>
>>> B.bar
<unbound method B.bar>
>>> B.baz
<unbound method B.bar>
>>> instance.foo
<unbound method A.foo>
>>> instance.bar
<bound method B.bar of <__main__.B object at 0x00000000036B7780>>
>>> instance.baz
<bound method B.bar of <__main__.B object at 0x00000000036B7780>>
>>> B.__dict__['bar']
<function bar at 0x00000000036C5048>
>>> B.__dict__['baz']
<unbound method B.bar>
>>> B.__dict__['foo']
<unbound method A.foo>

So, we have a function 'bar' stored in B's dict. When you access the 
function as the attribute B.bar Python 2.x will create an unbound method 
object. When you access the function through instance.bar Python creates a 
bound method. Note that every time you access instance.bar it creates 
another new method object:

>>> instance.bar is instance.bar
False

B.baz is an unbound method stored directly in B's dict. When you access 
instance.baz you get a new bound method object (it's at the same memory 
location as the previous one but that's only because the lifetimes don't 
overlap). Somewhat suprisingly the same also happens if you access B.baz: 
it creates a new unbound method from the existing unbound method:

>>> B.bar is B.__dict__['bar']
False

B.foo is an unbound method stored directly in B's dict, but it is a method 
of an A and B doesn't subclass A, so when you try to access B.foo you just 
get the stored unbound method it isn't converted into a new object.


From tjreedy at udel.edu  Sat Mar 20 12:33:01 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 20 Mar 2010 12:33:01 -0400
Subject: why is there now execption for windows? trying to listen twice
	to the same port
In-Reply-To: <4ba4e115$0$18400$426a74cc@news.free.fr>
References: <4ba4cfe3$0$7060$426a74cc@news.free.fr>	<4ba4d910$0$22939$e4fe514c@news.xs4all.nl>
	<4ba4e115$0$18400$426a74cc@news.free.fr>
Message-ID: <ho2tbr$oar$2@dough.gmane.org>

On 3/20/2010 10:52 AM, News123 wrote:
> Hi Irmen,
>
>
> Irmen de Jong wrote:
>> On 20-3-2010 14:38, News123 wrote:
>>> I'm having a small multiprocessing manager:
>>>
>>> # ##########################
>>> import socket,sys
>>> from multiprocessing.managers import BaseManager
>>>
>>> mngr = BaseManager(address=('127.0.0.1',8089),authkey='verysecret')
>>> try:
>>>       srvr = mngr.get_server()
>>> except socket.error as e:
>>>       print "probably address already in use"
>>>       sys.exit()
>>> print "serving"
>>> srvr.serve_forever()
>>>
>>> Under Windows however the program can be started twice.
>>> and will print twice "serving". This surprises me
>>
>>
>> My guess is that somewhere in the multiprocessing package the
>> SO_REUSEADDR option is used on the socket. And that option has different
>> semantics on Windows than it has on other operating systems. At least
>> one of them being the possibility of multiple bindings on the same port
>> without getting an error.
>> See http://bugs.python.org/issue2550.
>> Also see the code comments to bind_port in Lib/test/test_support.py,
>> that suggests using SO_EXCLUSIVEADDRUSE instead under Windows, but that
>> is not much use to you unless you monkeypatch the multiprocessing
>> package code.
>>
>
> Yes this might be.
>
>
> Then I think, that I should report it either as bug / enhancement

I agree. I would guess that the difference is not intentional.

> request. However I am not at all aware of the issue reporting process
> concerning python. (special site / module developer, PEP . . . )

bugs.python.org

Terry Jan Reedy



From tjreedy at udel.edu  Sat Mar 20 12:39:44 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 20 Mar 2010 12:39:44 -0400
Subject: How User-defined method objects are created?
In-Reply-To: <cf27c64f-ea5a-428c-898c-88d7eb748422@q23g2000yqd.googlegroups.com>
References: <cf27c64f-ea5a-428c-898c-88d7eb748422@q23g2000yqd.googlegroups.com>
Message-ID: <ho2tof$qd8$1@dough.gmane.org>

On 3/20/2010 9:54 AM, Joaquin Abian wrote:
> I'm trying to understand the description of method object creation in
> the python 2.6 language reference (3.2. The standard type hierarchy)
> with little success. The points knocking me are:
>
> "User-defined method objects may be created when getting an attribute
> of a class (perhaps via an instance of that class), if that attribute
> is a user-defined function object, an unbound user-defined method
> object, or a class method object. When the attribute is a user-defined
> method object, a new method object is only created if the class from
> which it is being retrieved is the same as, or a derived class of, the
> class stored in the original method object; otherwise, the original
> method object is used as it is."
>
> It is a bit of a tongue-twister for me. What the last sentence means?
> Please, I beg for a simple example of the different objects (user
> defined function, user defined method, class method) refered.
> Are maybe the refered objects exemplified by :
>
> #python 3.1
> class Klass():
>
> 	def met(self):
> 		print('method')
>
>         def func():
> 		print('function')
>
>         @classmethod
> 	def kmet(klass):
> 		print('classmethod')
>
> or it is talking about another thing?
> What is the difference with python 3 where there is no mention to the
> unbound user-defined method object (same section in python 3 language
> reference):

Python3 does not have unbound method objects. Klass.met above is just a 
function.l

> "User-defined method objects may be created when getting an attribute
> of a class (perhaps via an instance of that class), if that attribute
> is a user-defined function object or a class method object."
>
> I'm trying to learn, however the task is revealing as an enormous
> undertaking :-)

One can successfully use the language in the normal way without 
understanding every detail of every oddball corner case. Recent 2.x is 
complicated by duplication (two user object systems) and 
back-compatibility constraints. Most new users do not need to bother 
with obsolete complications.

Terry Jan Reedy



From waugustynski at gmail.com  Sat Mar 20 13:00:47 2010
From: waugustynski at gmail.com (waugust)
Date: Sat, 20 Mar 2010 10:00:47 -0700 (PDT)
Subject: Ubuntu install problems
Message-ID: <99adedf9-e02d-4c71-983b-8901b9fa6791@w39g2000prd.googlegroups.com>

I have 2.5 (for GAE), 2.6 (Ubuntu default), and 3.1 installed.
Whenever I apt-get install anything It ends with a series of python
(dependency?) errors.  Anybody got any idea?
> aptget libgcj-common
Reading package lists...
Done
Building dependency
tree
Reading state information...
Done
libgcj-common is already the newest
version.
0 upgraded, 0 newly installed, 0 to remove and 6 not
upgraded.
26 not fully installed or
removed.
After this operation, 0B of additional disk space will be
used.
Setting up libgcj-common
(1:4.4.1-1ubuntu2) ...
Compiling /usr/lib/python3.1/dist-packages/
aotcompile.py ...
  File "/usr/lib/python3.1/dist-packages/aotcompile.py", line
115
    raise Error, "nothing to
do"
 
^
SyntaxError: invalid
syntax

Compiling /usr/lib/python3.1/dist-packages/classfile.py ...
  File "/usr/lib/python3.1/dist-packages/classfile.py", line 30
    raise TypeError, type(arg)
                   ^
SyntaxError: invalid syntax

pycentral: pycentral pkginstall: error byte-compiling files (2)
pycentral pkginstall: error byte-compiling files (2)
dpkg: error processing libgcj-common (--configure):
 subprocess installed post-installation script returned error exit
status 1
dpkg: dependency problems prevent configuration of
libgcj10:
 libgcj10 depends on libgcj-common (>= 1:4.1.1-21);
however:
  Package libgcj-common is not configured
yet.
dpkg: error processing libgcj10 (--
configure):
 dependency problems - leaving
unconfigured
dpkg: dependency problems prevent configuration of libgcj-bc:

It snowballs down from there for:

No apport report written because MaxReports is reached already
                                                              Errors
were encountered while processing:
 libgcj-common
 libgcj10
 libgcj-bc
 ant-gcj
 ant-optional-gcj
 python-transaction
 python-zconfig
 python-zdaemon
 python-zope.exceptions
 python-zope.testing
 python-zope.proxy
 python-zodb
 python-zope.component
 gaphor
 gcj-4.4-jre-lib
 python-speechd
 python-pyatspi
 gnome-orca
 python-configglue
 python-telepathy
 python-ubuntuone-storageprotocol
 python-ubuntuone-client
 telepathy-butterfly
 ubuntuone-client
 ubuntuone-client-gnome
 python-zope.hookable
E: Sub-process /usr/bin/dpkg returned an error code (1)


From news1234 at free.fr  Sat Mar 20 13:11:25 2010
From: news1234 at free.fr (News123)
Date: Sat, 20 Mar 2010 18:11:25 +0100
Subject: why is there now execption for windows? trying to listen twice
	to the same port
In-Reply-To: <mailman.1008.1269102907.23598.python-list@python.org>
References: <4ba4cfe3$0$7060$426a74cc@news.free.fr>	<4ba4d910$0$22939$e4fe514c@news.xs4all.nl>	<4ba4e115$0$18400$426a74cc@news.free.fr>
	<mailman.1008.1269102907.23598.python-list@python.org>
Message-ID: <4ba501bd$0$7193$426a74cc@news.free.fr>

Terry Reedy wrote:
> On 3/20/2010 10:52 AM, News123 wrote:
>> Hi Irmen,
>>
>>
>> Irmen de Jong wrote:
>>> On 20-3-2010 14:38, News123 wrote:
>>>> I'm having a small multiprocessing manager:
>>>>
>>>> # ##########################
>>>> import socket,sys
>>>> from multiprocessing.managers import BaseManager
>>>>
>>>> mngr = BaseManager(address=('127.0.0.1',8089),authkey='verysecret')
>>>> try:
>>>>       srvr = mngr.get_server()
>>>> except socket.error as e:
>>>>       print "probably address already in use"
>>>>       sys.exit()
>>>> print "serving"
>>>> srvr.serve_forever()
>>>>
>>>> Under Windows however the program can be started twice.
>>>> and will print twice "serving". This surprises me
>>>
. . .
>>
>> Then I think, that I should report it either as bug / enhancement
> 
> I agree. I would guess that the difference is not intentional.
> 
>> request. However I am not at all aware of the issue reporting process
>> concerning python. (special site / module developer, PEP . . . )
> 
> bugs.python.org
> 
Thanks,


I created an account and submitted the issue


N


From benjamin.kaplan at case.edu  Sat Mar 20 13:15:16 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sat, 20 Mar 2010 13:15:16 -0400
Subject: Ubuntu install problems
In-Reply-To: <99adedf9-e02d-4c71-983b-8901b9fa6791@w39g2000prd.googlegroups.com>
References: <99adedf9-e02d-4c71-983b-8901b9fa6791@w39g2000prd.googlegroups.com>
Message-ID: <ec96e1391003201015o140bf70mc8552605cc3e3834@mail.gmail.com>

On Sat, Mar 20, 2010 at 1:00 PM, waugust <waugustynski at gmail.com> wrote:

> I have 2.5 (for GAE), 2.6 (Ubuntu default), and 3.1 installed.
> Whenever I apt-get install anything It ends with a series of python
> (dependency?) errors.  Anybody got any idea?
> > aptget libgcj-common
> Reading package lists...
> Done
> Building dependency
> tree
> Reading state information...
> Done
> libgcj-common is already the newest
> version.
> 0 upgraded, 0 newly installed, 0 to remove and 6 not
> upgraded.
> 26 not fully installed or
> removed.
> After this operation, 0B of additional disk space will be
> used.
> Setting up libgcj-common
> (1:4.4.1-1ubuntu2) ...
> Compiling /usr/lib/python3.1/dist-packages/
> aotcompile.py ...
>  File "/usr/lib/python3.1/dist-packages/aotcompile.py", line
> 115
>    raise Error, "nothing to
> do"
>
> ^
> SyntaxError: invalid
> syntax
>
> Compiling /usr/lib/python3.1/dist-packages/classfile.py ...
>  File "/usr/lib/python3.1/dist-packages/classfile.py", line 30
>    raise TypeError, type(arg)
>                   ^
> SyntaxError: invalid syntax
>
>
Did you set /usr/bin/python to Python 3.1? It needs to stay as the system
default Python (in this case 2.6) or else lots of stuff breaks. You're
getting those syntax errors because of the difference between Python 2.x
(which the scripts were written for) and Python 3.x (which is being run)
-------------- next part --------------
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From aahz at pythoncraft.com  Sat Mar 20 13:24:45 2010
From: aahz at pythoncraft.com (Aahz)
Date: 20 Mar 2010 10:24:45 -0700
Subject: Reverse engineering CRC?
References: <7vj7fdFnnjU1@mid.individual.net> <kz88du.hk0@spenarnc.xs4all.nl>
	<4B9E0C1F.9020003@canterbury.ac.nz>
Message-ID: <ho30ct$2bo$1@panix3.panix.com>

In article <4B9E0C1F.9020003 at canterbury.ac.nz>,
Gregory Ewing  <greg.ewing at canterbury.ac.nz> wrote:
>
>It turned out to be a very standard CRC algorithm, complicated
>by the presence of a few extra bytes of data being checked that
>didn't appear explicitly in the file anywhere.
>
>In the process I developed some very general techniques for
>solving this kind of problem, which I've written about here
>if anyone's interested:
>
>http://www.cosc.canterbury.ac.nz/greg.ewing/essays/CRC-Reverse-Engineering.html

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

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 20 13:25:03 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 20 Mar 2010 17:25:03 GMT
Subject: Ubuntu install problems
References: <99adedf9-e02d-4c71-983b-8901b9fa6791@w39g2000prd.googlegroups.com>
Message-ID: <4ba504ef$0$27838$c3e8da3@news.astraweb.com>

On Sat, 20 Mar 2010 10:00:47 -0700, waugust wrote:

> I have 2.5 (for GAE), 2.6 (Ubuntu default), and 3.1 installed. Whenever
> I apt-get install anything It ends with a series of python (dependency?)
> errors.  Anybody got any idea?

It looks like apt-get is supposed to be using 2.6 or 2.5, but somehow is 
running 3.1 instead.

If you run "python -V", what does it say?


-- 
Steven


From python at mrabarnett.plus.com  Sat Mar 20 13:26:58 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 20 Mar 2010 17:26:58 +0000
Subject: Ubuntu install problems
In-Reply-To: <99adedf9-e02d-4c71-983b-8901b9fa6791@w39g2000prd.googlegroups.com>
References: <99adedf9-e02d-4c71-983b-8901b9fa6791@w39g2000prd.googlegroups.com>
Message-ID: <4BA50562.1010600@mrabarnett.plus.com>

waugust wrote:
> I have 2.5 (for GAE), 2.6 (Ubuntu default), and 3.1 installed.
> Whenever I apt-get install anything It ends with a series of python
> (dependency?) errors.  Anybody got any idea?
>> aptget libgcj-common
> Reading package lists...
> Done
> Building dependency
> tree
> Reading state information...
> Done
> libgcj-common is already the newest
> version.
> 0 upgraded, 0 newly installed, 0 to remove and 6 not
> upgraded.
> 26 not fully installed or
> removed.
> After this operation, 0B of additional disk space will be
> used.
> Setting up libgcj-common
> (1:4.4.1-1ubuntu2) ...
> Compiling /usr/lib/python3.1/dist-packages/
> aotcompile.py ...
>   File "/usr/lib/python3.1/dist-packages/aotcompile.py", line
> 115
>     raise Error, "nothing to
> do"
>  
> ^
> SyntaxError: invalid
> syntax
> 
> Compiling /usr/lib/python3.1/dist-packages/classfile.py ...
>   File "/usr/lib/python3.1/dist-packages/classfile.py", line 30
>     raise TypeError, type(arg)
>                    ^
> SyntaxError: invalid syntax
> 
[snip]
In Python 2 an exception can be raised with the old-style:

     raise Error, "nothing to do"

or the new-style:

     raise Error("nothing to do")

In Python 3 the old style is not supported (it was abandoned as part of
the general clean-up).

Another related change is that the old-style:

     except Error, e:

in Python 2 has been completely replaced by the new-style:

     except Error as e:

in Python 3 (also available in Python 2.6).


From waugustynski at gmail.com  Sat Mar 20 13:40:08 2010
From: waugustynski at gmail.com (waugust)
Date: Sat, 20 Mar 2010 10:40:08 -0700 (PDT)
Subject: Ubuntu install problems
References: <99adedf9-e02d-4c71-983b-8901b9fa6791@w39g2000prd.googlegroups.com>
	<4ba504ef$0$27838$c3e8da3@news.astraweb.com>
Message-ID: <658a97c1-02d0-4158-a3b0-b82f1e66254a@q26g2000prh.googlegroups.com>

On Mar 20, 10:25?am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Sat, 20 Mar 2010 10:00:47 -0700, waugust wrote:
> > I have 2.5 (for GAE), 2.6 (Ubuntu default), and 3.1 installed. Whenever
> > I apt-get install anything It ends with a series of python (dependency?)
> > errors. ?Anybody got any idea?
>
> It looks like apt-get is supposed to be using 2.6 or 2.5, but somehow is
> running 3.1 instead.
>
> If you run "python -V", what does it say?
>
> --
> Steven

>python -V
Python 2.6.4

odd..yeah, I uninstalled all of the listed packages and started to
install again and got the same problem...


From saimapk81 at gmail.com  Sat Mar 20 14:03:00 2010
From: saimapk81 at gmail.com (saima81)
Date: Sat, 20 Mar 2010 11:03:00 -0700 (PDT)
Subject: "JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN 
	FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL JOBS
	IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
Message-ID: <9df66e21-4011-447c-9816-fc7f79416c4b@a37g2000prd.googlegroups.com>

"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
V


From agoretoy at gmail.com  Sat Mar 20 14:55:26 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Sat, 20 Mar 2010 12:55:26 -0600
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" 
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN 
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com>
Message-ID: <c9d33c541003201155j4150a3a0y503d97e311618e92@mail.gmail.com>

what do i do to remove this crap? how do i moderate it?

why not gpg sign messages on python-list that way you know your authorized
to post and spammers will have one more vector to deal with, there in
stopping the not so leet
-Alex Goretoy
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From Brian.Mingus at Colorado.EDU  Sat Mar 20 15:27:10 2010
From: Brian.Mingus at Colorado.EDU (Brian J Mingus)
Date: Sat, 20 Mar 2010 13:27:10 -0600
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" 
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN 
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <c9d33c541003201155j4150a3a0y503d97e311618e92@mail.gmail.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com> 
	<c9d33c541003201155j4150a3a0y503d97e311618e92@mail.gmail.com>
Message-ID: <9839a05c1003201227o5112a1f1i9de3a77ba7c613ab@mail.gmail.com>

Moderating this stuff requires moderating all messages. It would take a team
of volunteers.

On Sat, Mar 20, 2010 at 12:55 PM, alex goretoy <agoretoy at gmail.com> wrote:

> what do i do to remove this crap? how do i moderate it?
>
> why not gpg sign messages on python-list that way you know your authorized
> to post and spammers will have one more vector to deal with, there in
> stopping the not so leet
> -Alex Goretoy
>
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From darcy at druid.net  Sat Mar 20 15:37:48 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Sat, 20 Mar 2010 15:37:48 -0400
Subject: "EURO GIRLS" "MISS EUROPE"
In-Reply-To: <c9d33c541003201155j4150a3a0y503d97e311618e92@mail.gmail.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com>
	<c9d33c541003201155j4150a3a0y503d97e311618e92@mail.gmail.com>
Message-ID: <20100320153748.95f9cb49.darcy@druid.net>

On Sat, 20 Mar 2010 12:55:26 -0600
alex goretoy <agoretoy at gmail.com> wrote:
> what do i do to remove this crap? how do i moderate it?

First, please remove spam URLs when following up.  You left them in the
subject.

Maybe it's time to stop gatewaying the newsgroup to the mailing list.
As a test I have moved all Python posts from gmail.com with a
Newsgroup header into a separate folder and so far 99% of the spam
lands there.

Once you do that you can also enforce that posts can only come from
subscribed addresses.  I find that that cuts out almost 100% of the
spam.

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


From agoretoy at gmail.com  Sat Mar 20 15:54:18 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Sat, 20 Mar 2010 13:54:18 -0600
Subject: "EURO GIRLS" "MISS EUROPE"
In-Reply-To: <20100320153748.95f9cb49.darcy@druid.net>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com> 
	<c9d33c541003201155j4150a3a0y503d97e311618e92@mail.gmail.com> 
	<20100320153748.95f9cb49.darcy@druid.net>
Message-ID: <c9d33c541003201254y69c47a50y3e506c9d7b9e5f2a@mail.gmail.com>

On Sat, Mar 20, 2010 at 1:37 PM, D'Arcy J.M. Cain <darcy at druid.net> wrote:

> aybe it's time to stop gatewaying the newsgroup to the mailing list.
> As a test I have moved all Python posts from gmail.com with a
> Newsgroup header into
>

ok thx, I'm learning as I go along
-Alex Goretoy
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From mmanns at gmx.net  Sat Mar 20 17:30:09 2010
From: mmanns at gmx.net (Martin Manns)
Date: Sat, 20 Mar 2010 22:30:09 +0100
Subject: [ANN] Pyspread 0.1 released
Message-ID: <mailman.1017.1269123871.23598.python-announce-list@python.org>


Pyspread 0.1 released
=====================

After a long and eventful Alpha period, pyspread has finally reached
Beta stage. I thank all contributors and testers who have helped
getting pyspread to this point.

About: 
------

Pyspread is a cross-platform Python spreadsheet application. It is
based on and written in the programming language Python.

Instead of spreadsheet formulas, Python expressions are entered into
the spreadsheet cells. Each expression returns a Python object that can
be accessed from other cells. These objects can represent anything
including lists or matrices. 

Stability and compatibility
---------------------------

Pyspread runs pretty stable in CPython. Please note that old save files
are not compatible. Load them in the old version and copy the code to a
new version of pyspread via the clipboard. Being in Beta means
increased code stability. Save files are now going to be downwards
compatible. However, major beta releases (e. g. 0.1 to 0.2) may still
break compatibility. Such a change may occur only after being announced
in the previous major beta release.

New features
------------

    * New macro editor dialog.
    * Macros can now contain any Python code.
    * Macros load and save files are now plain text files.
    * Macros are now saved within the pys-file.
    * Macros files are now signed and included in the trusted file
      concept.

Bug fixes
---------

    * Cells can now be correctly accessed with negative index (BUG
      2965144)


Homepage
--------

http://pyspread.sourceforge.net



Enjoy

Martin



From gatoygata2 at gmail.com  Sat Mar 20 17:32:40 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Sat, 20 Mar 2010 14:32:40 -0700 (PDT)
Subject: How User-defined method objects are created?
References: <cf27c64f-ea5a-428c-898c-88d7eb748422@q23g2000yqd.googlegroups.com>
	<mailman.1009.1269103206.23598.python-list@python.org>
Message-ID: <d75118f3-c5ea-40e9-91a2-6b913dea50d7@d37g2000yqn.googlegroups.com>

On Mar 20, 5:39?pm, Terry Reedy <tjre... at udel.edu> wrote:
> On 3/20/2010 9:54 AM, Joaquin Abian wrote:
>
>
>
> > I'm trying to understand the description of method object creation in
> > the python 2.6 language reference (3.2. The standard type hierarchy)
> > with little success. The points knocking me are:
>
> > "User-defined method objects may be created when getting an attribute
> > of a class (perhaps via an instance of that class), if that attribute
> > is a user-defined function object, an unbound user-defined method
> > object, or a class method object. When the attribute is a user-defined
> > method object, a new method object is only created if the class from
> > which it is being retrieved is the same as, or a derived class of, the
> > class stored in the original method object; otherwise, the original
> > method object is used as it is."
>
> > It is a bit of a tongue-twister for me. What the last sentence means?
> > Please, I beg for a simple example of the different objects (user
> > defined function, user defined method, class method) refered.
> > Are maybe the refered objects exemplified by :
>
> > #python 3.1
> > class Klass():
>
> > ? ?def met(self):
> > ? ? ? ? ? ?print('method')
>
> > ? ? ? ? def func():
> > ? ? ? ? ? ?print('function')
>
> > ? ? ? ? @classmethod
> > ? ?def kmet(klass):
> > ? ? ? ? ? ?print('classmethod')
>
> > or it is talking about another thing?
> > What is the difference with python 3 where there is no mention to the
> > unbound user-defined method object (same section in python 3 language
> > reference):
>
> Python3 does not have unbound method objects. Klass.met above is just a
> function.l
>
> > "User-defined method objects may be created when getting an attribute
> > of a class (perhaps via an instance of that class), if that attribute
> > is a user-defined function object or a class method object."
>
> > I'm trying to learn, however the task is revealing as an enormous
> > undertaking :-)
>
> One can successfully use the language in the normal way without
> understanding every detail of every oddball corner case. Recent 2.x is
> complicated by duplication (two user object systems) and
> back-compatibility constraints. Most new users do not need to bother
> with obsolete complications.
>
> Terry Jan Reedy

Terry, Right, I was just reading about this difference in 2 vs 3 in
Lutz's book.
Well, in fact in my case I'm not a newcomer to python (neither a
professional). I have been programming for more than 4 years in python
mainly medium size scientific data management applications. Currently
I can write at a moderate speed and Im familiar with properties,
decorators, etc.

That's why it is so frustrating went I get lost in the language
reference manual in a matter I wrongly though was a simple stuff.

Thanks for your helpful comments.

JA


From gatoygata2 at gmail.com  Sat Mar 20 17:41:36 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Sat, 20 Mar 2010 14:41:36 -0700 (PDT)
Subject: How User-defined method objects are created?
References: <cf27c64f-ea5a-428c-898c-88d7eb748422@q23g2000yqd.googlegroups.com>
	<Xns9D41A6EC8DEA0duncanbooth@127.0.0.1>
Message-ID: <6e791682-f44c-43f1-948f-44e59e78c9f9@z4g2000yqa.googlegroups.com>

On Mar 20, 5:24?pm, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> Joaquin Abian <gatoyga... at gmail.com> wrote:
> > "User-defined method objects may be created when getting an attribute
> > of a class (perhaps via an instance of that class), if that attribute
> > is a user-defined function object, an unbound user-defined method
> > object, or a class method object. When the attribute is a user-defined
> > method object, a new method object is only created if the class from
> > which it is being retrieved is the same as, or a derived class of, the
> > class stored in the original method object; otherwise, the original
> > method object is used as it is."
>
> > It is a bit of a tongue-twister for me. What the last sentence means?
> > Please, I beg for a simple example of the different objects (user
> > defined function, user defined method, class method) refered.
> >>> class A(object):
>
> ? ? ? ? def foo(self): pass
>
> >>> class B(object):
>
> ? ? ? ? def bar(self): pass
>
> >>> B.baz = B.bar
> >>> B.foo = A.foo
> >>> instance = B()
> >>> B.foo
>
> <unbound method A.foo>>>> B.bar
>
> <unbound method B.bar>>>> B.baz
>
> <unbound method B.bar>>>> instance.foo
>
> <unbound method A.foo>>>> instance.bar
>
> <bound method B.bar of <__main__.B object at 0x00000000036B7780>>>>> instance.baz
>
> <bound method B.bar of <__main__.B object at 0x00000000036B7780>>>>> B.__dict__['bar']
>
> <function bar at 0x00000000036C5048>>>> B.__dict__['baz']
>
> <unbound method B.bar>>>> B.__dict__['foo']
>
> <unbound method A.foo>
>
> So, we have a function 'bar' stored in B's dict. When you access the
> function as the attribute B.bar Python 2.x will create an unbound method
> object. When you access the function through instance.bar Python creates a
> bound method. Note that every time you access instance.bar it creates
> another new method object:
>
> >>> instance.bar is instance.bar
>
> False
>
> B.baz is an unbound method stored directly in B's dict. When you access
> instance.baz you get a new bound method object (it's at the same memory
> location as the previous one but that's only because the lifetimes don't
> overlap). Somewhat suprisingly the same also happens if you access B.baz:
> it creates a new unbound method from the existing unbound method:
>
> >>> B.bar is B.__dict__['bar']
>
> False
>
> B.foo is an unbound method stored directly in B's dict, but it is a method
> of an A and B doesn't subclass A, so when you try to access B.foo you just
> get the stored unbound method it isn't converted into a new object.

Thanks Duncan, I think I got the idea. Your explanation together with
the comment from Terry about the absence of unbound method objects in
python 3 cleared some dust from my neuron(s)
Thanks!
JA


From no.email at please.post  Sat Mar 20 18:15:54 2010
From: no.email at please.post (kj)
Date: Sat, 20 Mar 2010 22:15:54 +0000 (UTC)
Subject: How to automate accessor definition?
Message-ID: <ho3heq$61v$1@reader1.panix.com>







I need to create a class solely for the purpose of encapsulating
a large number of disparate data items.  At the moment I have no
plans for any methods for this class other than the bazillion
accessors required to access these various instance variables.
(In case it matters, this class is meant to be a private helper
class internal to a module, and it won't be subclassed.)

What is "best practice" for implementing this sort of class
*succinctly* (i.e. without a lot of repetitive accessor code)?

Also, one more question concerning syntax.  Suppose that i represents
an instance of this class.  Is it possible to define the class to
support this syntax

  val = i.field
  i.field += 6

...rather than this one

  val = i.get_field()
  i.set_field(i.get_field() + 6)

?

TIA!

~K


From nilly16 at yahoo.com  Sat Mar 20 18:39:30 2010
From: nilly16 at yahoo.com (Jimbo)
Date: Sat, 20 Mar 2010 15:39:30 -0700 (PDT)
Subject: Best Way to extract Numbers from String
References: <ded7c9a6-e4b1-46f7-97ca-fd66708f7443@g1g2000pre.googlegroups.com>
	<c0f554a5-2407-40ff-9828-50e56b223d43@r1g2000yqj.googlegroups.com>
Message-ID: <61a6901b-40ce-4b7e-aa90-19696fcb9303@h35g2000pri.googlegroups.com>

On Mar 20, 11:51?pm, Luis M. Gonz?lez <luis... at gmail.com> wrote:
> On Mar 20, 12:04?am, Jimbo <nill... at yahoo.com> wrote:
>
>
>
>
>
> > Hello
>
> > I am trying to grab some numbers from a string containing HTML text.
> > Can you suggest any good functions that I could use to do this? What
> > would be the easiest way to extract the following numbers from this
> > string...
>
> > My String has this layout & I have commented what I want to grab:
> > [CODE] """</th>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="last">43.200 </td>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="change indicator" nowrap>0.040 </td>
>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?<td>43.150 </td> #
> > I need to grab this number only
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td>43.200 </td>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?<td>43.130 </td> #
> > I need to grab this number only
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td>43.290 </td> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td>43.100 </td> # I need to
> > grab this number only
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td>7,450,447 </td>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="middle"><a
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? href="/asx/markets/optionPrices.do?
> > by=underlyingCode&underlyingCode=BHP&expiryDate=&optionType=">Options</
> > a></td>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="middle"><a
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? href="/asx/markets/warrantPrices.do?
> > by=underlyingAsxCode&underlyingCode=BHP">Warrants & Structured
> > Products</a></td>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="middle"><a
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? href="/asx/markets/cfdPrices.do?
> > by=underlyingAsxCode&underlyingCode=BHP">CFDs</a></td>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="middle"><a href="http://hfgapps.hubb.com/asxtools/
> > Charts.aspx?
> > TimeFrame=D6&compare=comp_index&indicies=XJO&pma1=20&pma2=20&asxCode=BHP">< img
> > src="/images/chart.gif" border="0" height="15" width="15"></a>
> > </td>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td><a href="/research/announcements/status_notes.htm#XD">XD</a>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? </td>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td><a href="/asx/statistics/announcements.do?
> > by=asxCode&asxCode=BHP&timeframe=D&period=W">Recent</a>
> > </td>
> > ? ? ? ? ? ? ? ? ? ? ? ? </tr>"""[/CODE]
>
> You should use BeautifulSoup or perhaps regular expressions.
> Or if you are not very smart, lik me, just try a brute force approach:
>
> >>> for i in s.split('>'):
>
> ? ? ? ? for e in i.split():
> ? ? ? ? ? ? ? ? if '.' in e and e[0].isdigit():
> ? ? ? ? ? ? ? ? ? ? ? ? print (e)
>
> 43.200
> 0.040
> 43.150
> 43.200
> 43.130
> 43.290
> 43.100
>
>
>
> - Hide quoted text -
>
> - Show quoted text -- Hide quoted text -
>
> - Show quoted text -

Thanks very much, I'm going to look at regular expressions but that
for your code, it shows me how I can do it iwth standard python :)


From clp2 at rebertia.com  Sat Mar 20 18:54:20 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 20 Mar 2010 15:54:20 -0700
Subject: How to automate accessor definition?
In-Reply-To: <ho3heq$61v$1@reader1.panix.com>
References: <ho3heq$61v$1@reader1.panix.com>
Message-ID: <50697b2c1003201554v3294b545sd2c53bd203111e5@mail.gmail.com>

On Sat, Mar 20, 2010 at 3:15 PM, kj <no.email at please.post> wrote:
> I need to create a class solely for the purpose of encapsulating
> a large number of disparate data items. ?At the moment I have no
> plans for any methods for this class other than the bazillion
> accessors required to access these various instance variables.
> (In case it matters, this class is meant to be a private helper
> class internal to a module, and it won't be subclassed.)

If it's just a completely dumb struct-like class, you might consider
something like:
http://docs.python.org/library/collections.html#collections.namedtuple

> What is "best practice" for implementing this sort of class
> *succinctly* (i.e. without a lot of repetitive accessor code)?

Is there any good reason you can't just use straight instance
variables? Python ain't Java; vanilla, boilerplate accessor methods
should almost always be avoided.

> Also, one more question concerning syntax. ?Suppose that i represents
> an instance of this class. ?Is it possible to define the class to
> support this syntax
>
> ?val = i.field
> ?i.field += 6
>
> ...rather than this one
>
> ?val = i.get_field()
> ?i.set_field(i.get_field() + 6)
>
> ?

Yes, using the magic of the property() function:
http://docs.python.org/library/functions.html#property

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


From waugustynski at gmail.com  Sat Mar 20 19:32:51 2010
From: waugustynski at gmail.com (waugust)
Date: Sat, 20 Mar 2010 16:32:51 -0700 (PDT)
Subject: Ubuntu install problems
References: <99adedf9-e02d-4c71-983b-8901b9fa6791@w39g2000prd.googlegroups.com>
	<4ba504ef$0$27838$c3e8da3@news.astraweb.com>
	<658a97c1-02d0-4158-a3b0-b82f1e66254a@q26g2000prh.googlegroups.com>
Message-ID: <b6958613-a955-4305-82fa-c3287391197d@l40g2000pro.googlegroups.com>

On Mar 20, 10:40?am, waugust <waugustyn... at gmail.com> wrote:
> On Mar 20, 10:25?am, Steven D'Aprano <st... at REMOVE-THIS-
>
> cybersource.com.au> wrote:
> > On Sat, 20 Mar 2010 10:00:47 -0700, waugust wrote:
> > > I have 2.5 (for GAE), 2.6 (Ubuntu default), and 3.1 installed. Whenever
> > > I apt-get install anything It ends with a series of python (dependency?)
> > > errors. ?Anybody got any idea?
>
> > It looks like apt-get is supposed to be using 2.6 or 2.5, but somehow is
> > running 3.1 instead.
>
> > If you run "python -V", what does it say?
>
> > --
> > Steven
> >python -V
>
> Python 2.6.4
>
> odd..yeah, I uninstalled all of the listed packages and started to
> install again and got the same problem...

So I put this up to the Ubuntu (lunchpad, apt) community support
board: https://answers.launchpad.net/ubuntu/+source/apt/+question/105025

Possible bug with the python-central package (Ubuntu x86 9.10)?? dunno.


From fordhaivat at gmail.com  Sat Mar 20 20:51:44 2010
From: fordhaivat at gmail.com (Someone Something)
Date: Sat, 20 Mar 2010 20:51:44 -0400
Subject: Best Way to extract Numbers from String
In-Reply-To: <c0f554a5-2407-40ff-9828-50e56b223d43@r1g2000yqj.googlegroups.com>
References: <ded7c9a6-e4b1-46f7-97ca-fd66708f7443@g1g2000pre.googlegroups.com>
	<c0f554a5-2407-40ff-9828-50e56b223d43@r1g2000yqj.googlegroups.com>
Message-ID: <e196a4051003201751t59e5b40evf4174b4584750cd3@mail.gmail.com>

Its an extremely bad idea to use regex for HTML. You want to change one tiny
little thing and you have to write the regex all over again. if its a
throwaway script, then go ahead.
2010/3/20 Luis M. Gonz?lez <luismgz at gmail.com>

> On Mar 20, 12:04 am, Jimbo <nill... at yahoo.com> wrote:
> > Hello
> >
> > I am trying to grab some numbers from a string containing HTML text.
> > Can you suggest any good functions that I could use to do this? What
> > would be the easiest way to extract the following numbers from this
> > string...
> >
> > My String has this layout & I have commented what I want to grab:
> > [CODE] """</th>
> >                                 <td class="last">43.200 </td>
> >                                 <td class="change indicator" nowrap>0.040
> </td>
> >
> >                                                    <td>43.150 </td> #
> > I need to grab this number only
> >                                 <td>43.200 </td>
> >                                                    <td>43.130 </td> #
> > I need to grab this number only
> >                                 <td>43.290 </td>
>                 <td>43.100 </td> # I need to
> > grab this number only
> >                                 <td>7,450,447 </td>
> >                                 <td class="middle"><a
> >
> href="/asx/markets/optionPrices.do?
> > by=underlyingCode&underlyingCode=BHP&expiryDate=&optionType=">Options</
> > a></td>
> >                                 <td class="middle"><a
> >
> href="/asx/markets/warrantPrices.do?
> > by=underlyingAsxCode&underlyingCode=BHP">Warrants & Structured
> > Products</a></td>
> >                                 <td class="middle"><a
> >                                         href="/asx/markets/cfdPrices.do?
> > by=underlyingAsxCode&underlyingCode=BHP">CFDs</a></td>
> >                                 <td class="middle"><a href="
> http://hfgapps.hubb.com/asxtools/
> > Charts.aspx?
> >
> TimeFrame=D6&compare=comp_index&indicies=XJO&pma1=20&pma2=20&asxCode=BHP"><
> img
> > src="/images/chart.gif" border="0" height="15" width="15"></a>
> > </td>
> >                                 <td><a
> href="/research/announcements/status_notes.htm#XD">XD</a>
> >                                 </td>
> >                                 <td><a
> href="/asx/statistics/announcements.do?
> > by=asxCode&asxCode=BHP&timeframe=D&period=W">Recent</a>
> > </td>
> >                         </tr>"""[/CODE]
>
>
> You should use BeautifulSoup or perhaps regular expressions.
> Or if you are not very smart, lik me, just try a brute force approach:
>
> >>> for i in s.split('>'):
>        for e in i.split():
>                if '.' in e and e[0].isdigit():
>                        print (e)
>
>
> 43.200
> 0.040
> 43.150
> 43.200
> 43.130
> 43.290
> 43.100
> >>>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From fordhaivat at gmail.com  Sat Mar 20 20:53:45 2010
From: fordhaivat at gmail.com (Someone Something)
Date: Sat, 20 Mar 2010 20:53:45 -0400
Subject: How to automate accessor definition?
In-Reply-To: <50697b2c1003201554v3294b545sd2c53bd203111e5@mail.gmail.com>
References: <ho3heq$61v$1@reader1.panix.com>
	<50697b2c1003201554v3294b545sd2c53bd203111e5@mail.gmail.com>
Message-ID: <e196a4051003201753l45d52b37w6b0ac0d2d1ec7f38@mail.gmail.com>

Just initialize everything in the constructor, unless you have *really *good
reason not to do that.
On Sat, Mar 20, 2010 at 6:54 PM, Chris Rebert <clp2 at rebertia.com> wrote:

> On Sat, Mar 20, 2010 at 3:15 PM, kj <no.email at please.post> wrote:
> > I need to create a class solely for the purpose of encapsulating
> > a large number of disparate data items.  At the moment I have no
> > plans for any methods for this class other than the bazillion
> > accessors required to access these various instance variables.
> > (In case it matters, this class is meant to be a private helper
> > class internal to a module, and it won't be subclassed.)
>
> If it's just a completely dumb struct-like class, you might consider
> something like:
> http://docs.python.org/library/collections.html#collections.namedtuple
>
> > What is "best practice" for implementing this sort of class
> > *succinctly* (i.e. without a lot of repetitive accessor code)?
>
> Is there any good reason you can't just use straight instance
> variables? Python ain't Java; vanilla, boilerplate accessor methods
> should almost always be avoided.
>
> > Also, one more question concerning syntax.  Suppose that i represents
> > an instance of this class.  Is it possible to define the class to
> > support this syntax
> >
> >  val = i.field
> >  i.field += 6
> >
> > ...rather than this one
> >
> >  val = i.get_field()
> >  i.set_field(i.get_field() + 6)
> >
> > ?
>
> Yes, using the magic of the property() function:
> http://docs.python.org/library/functions.html#property
>
> Cheers,
> Chris
> --
> http://blog.rebertia.com
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 20 22:31:32 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 21 Mar 2010 02:31:32 GMT
Subject: How to automate accessor definition?
References: <ho3heq$61v$1@reader1.panix.com>
Message-ID: <4ba58503$0$27838$c3e8da3@news.astraweb.com>

On Sat, 20 Mar 2010 22:15:54 +0000, kj wrote:

> I need to create a class solely for the purpose of encapsulating a large
> number of disparate data items.

There's a built-in for that. It's called "dict". Syntax for item access 
is a tiny bit different, but still very common:

data['foo']

instead of

data.foo

If you need to customize item access, you need to modify __getitem__, 
__setitem__ and __delitem__ instead of __getattr__ etc., but otherwise 
they are nearly identical. Ignoring a few complications due to slots and 
inheritance, attribute access is built on top of item access, so you 
won't notice any performance hit (and you might see a tiny performance 
benefit).


> At the moment I have no plans for any
> methods for this class other than the bazillion accessors required to
> access these various instance variables.

Huh? If you have instance variables, why don't you refer to them by name?

x = MyClass()  # create an instance
y = MyClass()  # another variable bound to an instance
z = MyClass()  # etc.
print x, y, z



> (In case it matters, this class
> is meant to be a private helper class internal to a module, and it won't
> be subclassed.)
> 
> What is "best practice" for implementing this sort of class *succinctly*
> (i.e. without a lot of repetitive accessor code)?

Leave the repetitive accessor code out. Python isn't Java.

http://dirtsimple.org/2004/12/python-is-not-java.html


> Also, one more question concerning syntax.  Suppose that i represents an
> instance of this class.  Is it possible to define the class to support
> this syntax
> 
>   val = i.field
>   i.field += 6

Classes already support that.


>>> class C(object):
...     pass
...
>>> i = C()
>>> i.field = 42
>>> val = i.field
>>> i.field += 6
>>> print (val, i.field)
42 48


 
> ...rather than this one
> 
>   val = i.get_field()
>   i.set_field(i.get_field() + 6)
> 
> ?

Good grief! No wonder Java coders are so unproductive :(




-- 
Steven


From gregory.j.baker at gmail.com  Sat Mar 20 23:37:53 2010
From: gregory.j.baker at gmail.com (Novocastrian_Nomad)
Date: Sat, 20 Mar 2010 20:37:53 -0700 (PDT)
Subject: Best Way to extract Numbers from String
References: <ded7c9a6-e4b1-46f7-97ca-fd66708f7443@g1g2000pre.googlegroups.com>
	<c0f554a5-2407-40ff-9828-50e56b223d43@r1g2000yqj.googlegroups.com> 
	<61a6901b-40ce-4b7e-aa90-19696fcb9303@h35g2000pri.googlegroups.com>
Message-ID: <d2915a9a-23c7-4118-a1d2-8b92f5769c5e@a10g2000pri.googlegroups.com>

Regular expression are very powerful, and I use them  a lot in my
paying job (unfortunately not with Python).  You are however,
basically using a second programing language, which can be difficult
to master.

Does this give you the desired result?

import re

matches = re.findall('<td>([\d\.,]+)\s*</td>', code)
for match in matches:
    print match

resulting in this output:
43.150
43.200
43.130
43.290
43.100
7,450,447


From renws1990 at gmail.com  Sun Mar 21 03:23:26 2010
From: renws1990 at gmail.com (Ren Wenshan)
Date: Sun, 21 Mar 2010 00:23:26 -0700 (PDT)
Subject: How to keep effects of image filters going for some seconds?
Message-ID: <b151eeba-1e33-4f9e-b6c4-678af8cc5540@v20g2000prc.googlegroups.com>

Hello, every pythoner.

Firstly, I want to mention that English is my second language, so
maybe there are some sentences which makes you confused, sorry.

I have been learning Panda3D, an open source 3D engine, these days.
Now, I'm trying to write a small game for fun and practice. However,
I've ran into a problem.

I want to make some speical effects and there is my code:

def ventose(self):

    global potato_HP

    if potato_HP[0] == 1 and potato_HP[1] == 0:
    if random() > .30:
        self.filters.setCartoonInk(separation = 0.8)
        self.robotVincent.resetHead.start()
        self.decreaseVincentHP()
            Wait(3)
            self.fliters.delCartoonInk()

However, it doesn't work, the CartoonInk effect will never been shown
in my game and I don't want my game to wait three seconds, what I need
is to keep the effect for a period of time while the game run as well.

Besides that, I also want to show a counting back like "3", then "2",
then "1", finally "Go".

As a beginner, I don't know how to do them properly.

Please give me some directions, thank you.


-----------------------------
Vincent Ren



From jah.alarm at gmail.com  Sun Mar 21 06:11:05 2010
From: jah.alarm at gmail.com (Jah_Alarm)
Date: Sun, 21 Mar 2010 03:11:05 -0700 (PDT)
Subject: nonuniform sampling with replacement
Message-ID: <0c333952-2150-4207-90e8-7bb3f2bc7c4c@b9g2000pri.googlegroups.com>

I've got a vector length n of integers (some of them are repeating),
and I got a selection probability vector of the same length. How will
I sample with replacement k (<=n) values with the probabilty vector.
In Matlab this function is randsample. I couldn't find anything to
this extent in Scipy or Numpy.

thanks for the help

Alex


From donn.ingle at gmail.com  Sun Mar 21 07:08:07 2010
From: donn.ingle at gmail.com (donn)
Date: Sun, 21 Mar 2010 13:08:07 +0200
Subject: How to keep effects of image filters going for some seconds?
In-Reply-To: <b151eeba-1e33-4f9e-b6c4-678af8cc5540@v20g2000prc.googlegroups.com>
References: <b151eeba-1e33-4f9e-b6c4-678af8cc5540@v20g2000prc.googlegroups.com>
Message-ID: <4BA5FE17.20909@gmail.com>

On 21/03/2010 09:23, Ren Wenshan wrote:
> I have been learning Panda3D, an open source 3D engine,
Ask on the Panda3D forums, you will get good help there.

\d


From alfps at start.no  Sun Mar 21 08:03:00 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Sun, 21 Mar 2010 13:03:00 +0100
Subject: nonuniform sampling with replacement
In-Reply-To: <0c333952-2150-4207-90e8-7bb3f2bc7c4c@b9g2000pri.googlegroups.com>
References: <0c333952-2150-4207-90e8-7bb3f2bc7c4c@b9g2000pri.googlegroups.com>
Message-ID: <ho51tp$g6f$1@news.eternal-september.org>

* Jah_Alarm:
> I've got a vector length n of integers (some of them are repeating),
> and I got a selection probability vector of the same length. How will
> I sample with replacement k (<=n) values with the probabilty vector.
> In Matlab this function is randsample. I couldn't find anything to
> this extent in Scipy or Numpy.

<code>
#Py3
import operator     # itemgetter
import random
from collections import defaultdict

def normalized_to_sum( s, v ):
     current_s = sum( v )
     c = s/current_s
     return [c*x for x in v]

class ValueSampler:
     def __init__( self, values, probabilities ):
         assert len( values ) == len( probabilities )
         get2nd = operator.itemgetter( 1 )
         v_p = sorted( zip( values, probabilities ), key = get2nd, reverse = True )
         v_ap = [];  sum = 0;
         for (v, p) in v_p:
             v_ap.append( (v, p + sum) );
             sum += p
         self._data = v_ap

     def __call__( self, p ):
         return self.choice( p )

     def choice( self, p ):
         data = self._data; i_v = 0; i_p = 1;
         assert 0 <= p <= 1
         assert len( data ) > 0, "Sampler: Sampling from empty value set"
         low = 0; high = len( data ) - 1;
         if p > data[high][i_p]: return data[high][i_p]  # Float values workaround.
         while low != high:
             mid = (low + high)//2
             if p > data[mid][i_p]:
                 low = mid + 1
             else:
                 high = mid
         return data[low][i_v]


def main():
     v = [3, 1, 4, 1, 5, 9, 2, 6, 5, 4];
     p = normalized_to_sum( 1, [2, 7, 1, 8, 2, 8, 1, 8, 2, 8] )
     sampler = ValueSampler( v, p )

     probabilities = defaultdict( lambda: 0.0 )
     for (i, value) in enumerate( v ):
         probabilities[value] += p[i]
     print( probabilities )
     print()

     frequencies = defaultdict( lambda: 0.0 )
     n = 100000
     for i in range( n ):
         value = sampler( random.random() )
         frequencies[value] += 1/n
     print( frequencies )

main()
</code>


Cheers & hth.,

- Alf

Disclaimer: I just cooked it up and just cooked up binary searches usually have 
bugs. They usually need to be exercised and fixed. But I think you get the idea. 
Note also that division differs in Py3 and Py2. This is coded for Py3.


From __peter__ at web.de  Sun Mar 21 08:27:44 2010
From: __peter__ at web.de (Peter Otten)
Date: Sun, 21 Mar 2010 13:27:44 +0100
Subject: nonuniform sampling with replacement
References: <0c333952-2150-4207-90e8-7bb3f2bc7c4c@b9g2000pri.googlegroups.com>
Message-ID: <ho53bu$eeh$03$1@news.t-online.com>

Jah_Alarm wrote:

> I've got a vector length n of integers (some of them are repeating),
> and I got a selection probability vector of the same length. How will
> I sample with replacement k (<=n) values with the probabilty vector.
> In Matlab this function is randsample. I couldn't find anything to
> this extent in Scipy or Numpy.

If all else fails you can do it yourself:

import random
import bisect

def iter_sample_with_replacement(values, weights):
    _random = random.random
    _bisect = bisect.bisect

    acc_weights = []
    sigma = 0
    for w in weights:
        sigma += w
        acc_weights.append(sigma)
    while 1:
        yield values[_bisect(acc_weights, _random()*sigma)]

def sample_with_replacement(k, values, weights):
    return list(islice(iter_sample_with_replacement(values, weights), k))

if __name__ == "__main__":
    from itertools import islice
    N = 10**6
    values = range(4)
    weights = [2, 3, 4, 1]

    histo = [0] * len(values)
    for v in islice(iter_sample_with_replacement(values, weights), N):
        histo[v] += 1
    print histo
    print sample_with_replacement(30, values, weights)

Peter

                   



From alfps at start.no  Sun Mar 21 08:28:15 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Sun, 21 Mar 2010 13:28:15 +0100
Subject: nonuniform sampling with replacement
In-Reply-To: <ho51tp$g6f$1@news.eternal-september.org>
References: <0c333952-2150-4207-90e8-7bb3f2bc7c4c@b9g2000pri.googlegroups.com>
	<ho51tp$g6f$1@news.eternal-september.org>
Message-ID: <ho53d3$o12$1@news.eternal-september.org>

* Alf P. Steinbach:
> * Jah_Alarm:
>> I've got a vector length n of integers (some of them are repeating),
>> and I got a selection probability vector of the same length. How will
>> I sample with replacement k (<=n) values with the probabilty vector.
>> In Matlab this function is randsample. I couldn't find anything to
>> this extent in Scipy or Numpy.
> 
> <code>
[snip]
> </code>
> 
> 
> Disclaimer: I just cooked it up and just cooked up binary searches 
> usually have bugs. They usually need to be exercised and fixed. But I 
> think you get the idea. Note also that division differs in Py3 and Py2. 
> This is coded for Py3.

Sorry, I realized this just now: the name "p" in the choice() method is utterly 
misleading, which you can see from the call; it's a random number not a 
probability. I guess my fingers just repeated what they typed earlier.


Cheeers,

- Alf (repeat typist)


From slais-www at ucl.ac.uk  Sun Mar 21 10:29:58 2010
From: slais-www at ucl.ac.uk (djc)
Date: Sun, 21 Mar 2010 14:29:58 +0000
Subject: should writing Unicode files be so slow
In-Reply-To: <mailman.993.1269044370.23598.python-list@python.org>
References: <hnu9gl$fg7e$1@uns-a.ucl.ac.uk>
	<8739zxw057.fsf@benfinney.id.au>	<hnvpfj$7k76$1@uns-a.ucl.ac.uk>
	<87ljdov59q.fsf@benfinney.id.au>	<ho0bkp$cc3g$1@uns-a.ucl.ac.uk>
	<mailman.993.1269044370.23598.python-list@python.org>
Message-ID: <ho5ah6$eo6s$1@uns-a.ucl.ac.uk>

Antoine Pitrou wrote:
> Le Fri, 19 Mar 2010 17:18:17 +0000, djc a ?crit :
>> changing
>> with open(filename, 'rU') as tabfile: to
>> with codecs.open(filename, 'rU', 'utf-8', 'backslashreplace') as
>> tabfile:
>>
>> and
>> with open(outfile, 'wt') as out_part: to
>> with codecs.open(outfile, 'w', 'utf-8') as out_part:
>>
>> causes a program that runs  in
>> 43 seconds to take 4 minutes to process the same data.
> 
> codecs.open() (and the object it returns) is slow as it is written in 
> pure Python.
> 
> Accelerated reading and writing of unicode files is available in Python 
> 2.7 and 3.1, using the new `io` module.

Thank you, for a clear and to the point explanation. I shall concentrate on
finding an optimal time to upgrade from Python 2.6.


-- 
David Clark, MSc, PhD.              UCL Centre for Publishing
                                    Gower Str London WCIE 6BT
What sort of web animal are you?
            <https://www.bbc.co.uk/labuk/experiments/webbehaviour>


From ra21vi at gmail.com  Sun Mar 21 10:43:27 2010
From: ra21vi at gmail.com (Ravi Kumar)
Date: Sun, 21 Mar 2010 14:43:27 +0000
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" 
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN 
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <9839a05c1003201227o5112a1f1i9de3a77ba7c613ab@mail.gmail.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com> 
	<c9d33c541003201155j4150a3a0y503d97e311618e92@mail.gmail.com> 
	<9839a05c1003201227o5112a1f1i9de3a77ba7c613ab@mail.gmail.com>
Message-ID: <9a63e8921003210743t30fac328oed4a5b336ebcda19@mail.gmail.com>

On Sat, Mar 20, 2010 at 7:27 PM, Brian J Mingus
<Brian.Mingus at colorado.edu>wrote:

> Moderating this stuff requires moderating all messages. It would take a
> team of volunteers.
>

You are right... Form the team of volunteers. More people in it, better it
would be - since no one would have to be dedicated.

-- 
-=Ravi=-
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From vicente.soler at gmail.com  Sun Mar 21 11:02:45 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sun, 21 Mar 2010 08:02:45 -0700 (PDT)
Subject: Clearing memory (namespace) before running code
Message-ID: <0756022b-3893-4558-ab06-79bb467f1da4@b30g2000yqd.googlegroups.com>

Hi,

Is there a way to erase/delete/clear memory before a piece of code is
run?

Otherwise, the objects of the previous run are re-usable, and may
bring confusion to the tester.

Thank you


From steve at holdenweb.com  Sun Mar 21 11:11:18 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 21 Mar 2010 11:11:18 -0400
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS"
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com>
Message-ID: <ho5cv5$sp8$1@dough.gmane.org>

Brian J Mingus wrote:
> 
[... duplicating the spam and thereby lending it further Google juice ...]
>     --
>     http://mail.python.org/mailman/listinfo/python-list
> 
> Guys, I know it is a lot of work to moderate a large mailing list. But
> still, with so many of us surely we can pull it off?
> 
It's actually not as easy as you might think. If someone can propose a
*practical* scheme for moderation of this high-volume list the PSF might
consider such a proposal, but there would need to be considerable
evidence that the scheme would work without delaying traffic.

Since the spam that's getting through actually represents a tiny
fraction of one percent of the spam that the list is bombarded with I
personally feel that there would be very little positive return for a
relatively large investment of effort, and that any volunteer time would
be better spent making other contributions to the Python community.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Sun Mar 21 11:13:44 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 21 Mar 2010 11:13:44 -0400
Subject: Clearing memory (namespace) before running code
In-Reply-To: <0756022b-3893-4558-ab06-79bb467f1da4@b30g2000yqd.googlegroups.com>
References: <0756022b-3893-4558-ab06-79bb467f1da4@b30g2000yqd.googlegroups.com>
Message-ID: <ho5d3n$sp8$2@dough.gmane.org>

vsoler wrote:
> Hi,
> 
> Is there a way to erase/delete/clear memory before a piece of code is
> run?
> 
> Otherwise, the objects of the previous run are re-usable, and may
> bring confusion to the tester.
> 
> Thank you

You mean clear a *namespace*?

That might be possible if you have access to the specific module whose
namespace you want to clear.

I presume this is related to earlier questions about reloading modules?
This is yet another reason why you might want to consider running each
module in its own process each time the user submits it.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From joncle at googlemail.com  Sun Mar 21 11:18:01 2010
From: joncle at googlemail.com (Jon Clements)
Date: Sun, 21 Mar 2010 08:18:01 -0700 (PDT)
Subject: Clearing memory (namespace) before running code
References: <0756022b-3893-4558-ab06-79bb467f1da4@b30g2000yqd.googlegroups.com>
Message-ID: <42678333-5b0f-43bb-9488-7e127d078083@l25g2000yqd.googlegroups.com>

On 21 Mar, 15:02, vsoler <vicente.so... at gmail.com> wrote:
> Hi,
>
> Is there a way to erase/delete/clear memory before a piece of code is
> run?
>
> Otherwise, the objects of the previous run are re-usable, and may
> bring confusion to the tester.
>
> Thank you

I'm guessing you're using some sort of IDE?

For instance, in IDLE if the [Python Shell] window is not closed, the
session is kept. However, there is a menu option 'Shell' which has
'Restart Shell'. If you don't see a 'Shell' menu option, then make
sure IDLE isn't being started with the -n option.

However I would have thought the 'tester' would be running from a
terminal/command line/double click jobby, so that a single Python
session is executed and just runs -- rather than want to use it
interactively afterwards.

hth

Jon.


From deets at nospam.web.de  Sun Mar 21 12:08:58 2010
From: deets at nospam.web.de (Diez B. Roggisch)
Date: 21 Mar 2010 16:08:58 GMT
Subject: How to automate accessor definition?
References: <ho3heq$61v$1@reader1.panix.com>
Message-ID: <639908184290880449.447600deets-nospam.web.de@news.hansenet.de>

kj <no.email at please.post> wrote:
> 
> 
> 
> 
> 
> 
> I need to create a class solely for the purpose of encapsulating
> a large number of disparate data items.  At the moment I have no
> plans for any methods for this class other than the bazillion
> accessors required to access these various instance variables.
> (In case it matters, this class is meant to be a private helper
> class internal to a module, and it won't be subclassed.)
> 
> What is "best practice" for implementing this sort of class
> *succinctly* (i.e. without a lot of repetitive accessor code)?
> 
> Also, one more question concerning syntax.  Suppose that i represents
> an instance of this class.  Is it possible to define the class to
> support this syntax
> 
>   val = i.field
>   i.field += 6
> 
> ...rather than this one
> 
>   val = i.get_field()
>   i.set_field(i.get_field() + 6)
> 
> ?


You don't. Python is not Java. So just use instance attributes, and if
you need bhavior when accessing an attribute, introduce a property. 

Diez


From zookog at gmail.com  Sun Mar 21 12:55:41 2010
From: zookog at gmail.com (Zooko O'Whielacronx)
Date: Sun, 21 Mar 2010 10:55:41 -0600
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" 
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN 
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <9839a05c1003201227o5112a1f1i9de3a77ba7c613ab@mail.gmail.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com>
	<c9d33c541003201155j4150a3a0y503d97e311618e92@mail.gmail.com>
	<9839a05c1003201227o5112a1f1i9de3a77ba7c613ab@mail.gmail.com>
Message-ID: <cd6401a1003210955u3678ad25y2d6b3f549a24cc03@mail.gmail.com>

On Sat, Mar 20, 2010 at 1:27 PM, Brian J Mingus
<Brian.Mingus at colorado.edu> wrote:
> Moderating this stuff requires moderating all messages.

Not quite. GNU Mailman comes with nice features to ease this task. You
can configure it so that everyone who is currently subscribed can post
freely, but new subscribers get a "moderated" bit set on them. The
first time this new subscriber attempts to post to the list, a human
moderator has to inspect their message and decide whether to approve
it or deny it. If they human moderator approves it, they can also on
the same web form remove the "moderated" bit from that poster.

Therefore, the volunteer work required would be inspecting the *first*
post from each *new* subscriber to see if that post is spam.

Regards,

Zooko


From no.email at please.post  Sun Mar 21 12:57:40 2010
From: no.email at please.post (kj)
Date: Sun, 21 Mar 2010 16:57:40 +0000 (UTC)
Subject: How to automate accessor definition?
References: <ho3heq$61v$1@reader1.panix.com>
	<639908184290880449.447600deets-nospam.web.de@news.hansenet.de>
Message-ID: <ho5j64$22l$1@reader1.panix.com>

In <639908184290880449.447600deets-nospam.web.de at news.hansenet.de> Diez B. Roggisch <deets at nospam.web.de> writes:

>You don't. Python is not Java. So just use instance attributes, and if
>you need bhavior when accessing an attribute, introduce a property. 


Just accessing attributes looks a bit dangerous to me, due to bugs
like typing

  i.typo = 'foo'

when what you meant is

  i.type = 'foo'

I tried fixing this by mucking with __setattr__, but I didn't hit
on a satisfactory solution (basically, I couldn't find a good,
self-maintaining, way to specify the attributes that were OK to
set from those that weren't).  Is there anything built-in?

Regarding properties, is there a built-in way to memoize them? For
example, suppose that the value of a property is obtained by parsing
the contents of a file (specified in another instance attribute).
It would make no sense to do this parsing more than once.  Is there
a standard idiom for memoizing the value once it is determined for
the first time?

Thanks!

~K


From no.email at please.post  Sun Mar 21 13:02:30 2010
From: no.email at please.post (kj)
Date: Sun, 21 Mar 2010 17:02:30 +0000 (UTC)
Subject: How to automate accessor definition?
References: <ho3heq$61v$1@reader1.panix.com>
	<mailman.1018.1269125666.23598.python-list@python.org>
Message-ID: <ho5jf5$22l$2@reader1.panix.com>

In <mailman.1018.1269125666.23598.python-list at python.org> Chris Rebert <clp2 at rebertia.com> writes:

>On Sat, Mar 20, 2010 at 3:15 PM, kj <no.email at please.post> wrote:
>> I need to create a class solely for the purpose of encapsulating
>> a large number of disparate data items. =C2=A0At the moment I have no
>> plans for any methods for this class other than the bazillion
>> accessors required to access these various instance variables.
>> (In case it matters, this class is meant to be a private helper
>> class internal to a module, and it won't be subclassed.)

>If it's just a completely dumb struct-like class, you might consider
>something like:
>http://docs.python.org/library/collections.html#collections.namedtuple

Very cool.  Thanks!  The class I have in mind is *almost* that
dumb, but performance is a consideration in this case, which may
rule out namedtuple.  But I'm glad to learn about it; there are
many places where I can put them to good use.

~K


From benjamin at python.org  Sun Mar 21 13:12:08 2010
From: benjamin at python.org (Benjamin Peterson)
Date: Sun, 21 Mar 2010 12:12:08 -0500
Subject: [RELEASED] Python 3.1.2
Message-ID: <1afaf6161003211012r30bc0e77ub5dfe9f248668525@mail.gmail.com>

On behalf of the Python development team, I'm joyful to announce the second
bugfix release of the Python 3.1 series, Python 3.1.2.

This bug fix release fixes numerous issues found in 3.1.1, and is considered a
production release.

The Python 3.1 version series focuses on the stabilization and optimization of
the features and changes that Python 3.0 introduced.  For example, the new I/O
system has been rewritten in C for speed.  File system APIs that use unicode
strings now handle paths with undecodable bytes in them. Other features include
an ordered dictionary implementation, a condensed syntax for nested with
statements, and support for ttk Tile in Tkinter.  For a more extensive list of
changes in 3.1, see http://doc.python.org/3.1/whatsnew/3.1.html or Misc/NEWS in
the Python distribution.

To download Python 3.1.2 visit:

     http://www.python.org/download/releases/3.1.2/

A list of changes in 3.1.2 can be found here:

     http://svn.python.org/projects/python/tags/r312/Misc/NEWS

The 3.1 documentation can be found at:

     http://docs.python.org/3.1

Bugs can always be reported to:

     http://bugs.python.org


Enjoy!

--
Benjamin Peterson
Release Manager
benjamin at python.org
(on behalf of the entire python-dev team and 3.1.2's contributors)


From steve at holdenweb.com  Sun Mar 21 13:12:23 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 21 Mar 2010 13:12:23 -0400
Subject: How to automate accessor definition?
In-Reply-To: <ho5jf5$22l$2@reader1.panix.com>
References: <ho3heq$61v$1@reader1.panix.com>	<mailman.1018.1269125666.23598.python-list@python.org>
	<ho5jf5$22l$2@reader1.panix.com>
Message-ID: <ho5k28$jge$1@dough.gmane.org>

kj wrote:
> In <mailman.1018.1269125666.23598.python-list at python.org> Chris Rebert <clp2 at rebertia.com> writes:
> 
>> On Sat, Mar 20, 2010 at 3:15 PM, kj <no.email at please.post> wrote:
>>> I need to create a class solely for the purpose of encapsulating
>>> a large number of disparate data items. =C2=A0At the moment I have no
>>> plans for any methods for this class other than the bazillion
>>> accessors required to access these various instance variables.
>>> (In case it matters, this class is meant to be a private helper
>>> class internal to a module, and it won't be subclassed.)
> 
>> If it's just a completely dumb struct-like class, you might consider
>> something like:
>> http://docs.python.org/library/collections.html#collections.namedtuple
> 
> Very cool.  Thanks!  The class I have in mind is *almost* that
> dumb, but performance is a consideration in this case, which may
> rule out namedtuple.  But I'm glad to learn about it; there are
> many places where I can put them to good use.
> 
You may well find that namedtuple is faster than what you put together
yourself, as the collections module is implemented in C.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From no.email at please.post  Sun Mar 21 13:25:08 2010
From: no.email at please.post (kj)
Date: Sun, 21 Mar 2010 17:25:08 +0000 (UTC)
Subject: How to automate accessor definition?
References: <ho3heq$61v$1@reader1.panix.com>
	<4ba58503$0$27838$c3e8da3@news.astraweb.com>
Message-ID: <ho5kpk$j4p$1@reader1.panix.com>

In <4ba58503$0$27838$c3e8da3 at news.astraweb.com> Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:

>On Sat, 20 Mar 2010 22:15:54 +0000, kj wrote:

>> I need to create a class solely for the purpose of encapsulating a large
>> number of disparate data items.

>There's a built-in for that. It's called "dict". Syntax for item access 
>is a tiny bit different, but still very common:

>data['foo']

>instead of

>data.foo

I find the latter more readable than the former.  All those extra
elements (the brackets and the quotes, vs the single dot) add
Perl-like visual noise to the code, IMHO.

And dicts are vulnerable to this sort of bug:

  data['typo'] = type(foobar)

Also, AFAIK, initialization of a dictionary is never as simple as

  i = myclass(*fields)

But in a sense you're right: aside from these objections,
*functionality-wise* what I'm looking for is not very different
from a dictionary, or a C struct.

>> At the moment I have no plans for any
>> methods for this class other than the bazillion accessors required to
>> access these various instance variables.

>Huh? If you have instance variables, why don't you refer to them by name?

I'm sorry, I used the wrong terminology.  I see now that the correct
term is "(instance) attribute", not "instance variable".

>Leave the repetitive accessor code out. Python isn't Java.

>http://dirtsimple.org/2004/12/python-is-not-java.html

Thanks for the link!  The bit about "Guido's time machine" is pretty
funny.

~K


From benjamin.kaplan at case.edu  Sun Mar 21 13:38:42 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sun, 21 Mar 2010 13:38:42 -0400
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" 
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN 
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <cd6401a1003210955u3678ad25y2d6b3f549a24cc03@mail.gmail.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com>
	<c9d33c541003201155j4150a3a0y503d97e311618e92@mail.gmail.com>
	<9839a05c1003201227o5112a1f1i9de3a77ba7c613ab@mail.gmail.com>
	<cd6401a1003210955u3678ad25y2d6b3f549a24cc03@mail.gmail.com>
Message-ID: <ec96e1391003211038t48ff17abs338b7ab05d7626b8@mail.gmail.com>

On Sun, Mar 21, 2010 at 12:55 PM, Zooko O'Whielacronx <zookog at gmail.com> wrote:
> On Sat, Mar 20, 2010 at 1:27 PM, Brian J Mingus
> <Brian.Mingus at colorado.edu> wrote:
>> Moderating this stuff requires moderating all messages.
>
> Not quite. GNU Mailman comes with nice features to ease this task. You
> can configure it so that everyone who is currently subscribed can post
> freely, but new subscribers get a "moderated" bit set on them. The
> first time this new subscriber attempts to post to the list, a human
> moderator has to inspect their message and decide whether to approve
> it or deny it. If they human moderator approves it, they can also on
> the same web form remove the "moderated" bit from that poster.
>
> Therefore, the volunteer work required would be inspecting the *first*
> post from each *new* subscriber to see if that post is spam.
>
> Regards,
>
> Zooko

The spam isn't coming through the mailing list. It's coming through
the Google Groups mirror of the Usenet newsgroup. I don't think
Mailman can do anything about that.


From pmaupin at gmail.com  Sun Mar 21 13:42:34 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sun, 21 Mar 2010 10:42:34 -0700 (PDT)
Subject: RSON 0.06 released
Message-ID: <0b40fdf6-3fdd-4962-9994-c7c0936c588a@x12g2000yqx.googlegroups.com>

I am pleased to announce the release of RSON 0.06.

The goal of the RSON project is to create a file format that is easy
to edit, diff, and version control, that is a superset of JSON and
smaller than YAML.

I consider this release to be feature complete on the file format, and
I believe the pure Python 2.x decoder (parser) to be production worthy
(for users who do not need the speed of a C based decoder).

The project is at:

http://rson.googlecode.com/

The manual with syntax examples is at:

http://rson.googlecode.com/files/rson_0_06_manual.pdf

Discussions at:

http://groups.google.com/group/rson-discuss



From ale.marino78 at gmail.com  Sun Mar 21 14:12:18 2010
From: ale.marino78 at gmail.com (Alessandro Marino)
Date: Sun, 21 Mar 2010 19:12:18 +0100
Subject: Regexp problem when parsing a string
Message-ID: <9b9cf8321003211112q2333fb74h29e9a805053d1a13@mail.gmail.com>

I'm a beginner and I was trying to write a program to parse recursively all
file names in a directory specified as parameter. The problem is that I get
a "None" printed to stdout when a file is positively matched. While when the
file name doesn't match the regexp the output seems ok.

C:\>c:\python.exe g:\a.py sample
====> foo - bar.txt , first part is: foo
None
skipping: foo.txt

Instead I expect an output like this one:

C:\>c:\python.exe g:\a.py sample
====> foo - bar.txt , first part is: foo
None
skipping: foo.txt

Could anyone help me to figure out why "None" appears in the putput?

Thanks and regards,
Ale
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From andrej.mitrovich at gmail.com  Sun Mar 21 14:14:16 2010
From: andrej.mitrovich at gmail.com (Andrej Mitrovic)
Date: Sun, 21 Mar 2010 11:14:16 -0700 (PDT)
Subject: Python Documentation website layout changed?
References: <21fcbd63-fd1e-4b53-89b3-393c15591372@m37g2000yqf.googlegroups.com>
	<27c7e0a7-5a26-40f2-94ba-0af9cb530d67@g28g2000yqh.googlegroups.com> 
	<4BA120A9.3060001@holdenweb.com>
	<mailman.992.1269041589.23598.python-list@python.org>
Message-ID: <3116d122-3a7e-47d6-9bc9-574825ac7391@q23g2000yqd.googlegroups.com>

On Mar 20, 12:32?am, Steve Holden <st... at holdenweb.com> wrote:
> Steve Holden wrote:
> > Andrej Mitrovic wrote:
> >> On Mar 17, 6:41 pm, Andrej Mitrovic <andrej.mitrov... at gmail.com>
> >> wrote:
> >>> Hi,
>
> >>> What happened to the sidebar on the left of the documentation website?
> >>> It seems to be gone:
>
> >>>http://docs.python.org/py3k/index.html
>
> >>> I found it quite useful since I can quickly swap between Python2/3
> >>> documentation, and between other parts of the documentation as well.
> >> Edit: It looks like only the Python 3 pages are affected, the Python 2
> >> pages are the same as before:
>
> >>http://docs.python.org/index.html
>
> >> Might be a bug?
>
> > I'll ask. Georg - is this known behavior or a temporary problem?
>
> It's a bug. Georg is on it.
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ? ? +1 571 484 6266 ? +1 800 494 3119
> See PyCon Talks from Atlanta 2010 ?http://pycon.blip.tv/
> Holden Web LLC ? ? ? ? ? ? ? ?http://www.holdenweb.com/
> UPCOMING EVENTS: ? ? ? ?http://holdenweb.eventbrite.com/

Looks like it's fixed now. Thanks Georg & Steve!


From steve at REMOVE-THIS-cybersource.com.au  Sun Mar 21 14:18:57 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 21 Mar 2010 18:18:57 GMT
Subject: How to automate accessor definition?
References: <ho3heq$61v$1@reader1.panix.com>
	<639908184290880449.447600deets-nospam.web.de@news.hansenet.de>
	<ho5j64$22l$1@reader1.panix.com>
Message-ID: <4ba66311$0$27838$c3e8da3@news.astraweb.com>

On Sun, 21 Mar 2010 16:57:40 +0000, kj wrote:

> Just accessing attributes looks a bit dangerous to me, due to bugs like
> typing
> 
>   i.typo = 'foo'
> 
> when what you meant is
> 
>   i.type = 'foo'

That's the price you pay for using a dynamic language like Python with no 
declarations. But honestly, the price isn't very high, particularly if 
you use an editor or IDE with auto-completion. I can't think of the last 
time I had an error due to the above sort of mistake.

Besides, is that error really so much more likely than this?

    i.type = 'fpo'

when you meant 'foo'? The compiler can't protect you from that error, not 
in any language.


> I tried fixing this by mucking with __setattr__, but I didn't hit on a
> satisfactory solution (basically, I couldn't find a good,
> self-maintaining, way to specify the attributes that were OK to set from
> those that weren't).  Is there anything built-in?

No.

You could abuse __slots__, but it really is abuse: __slots__ are a memory 
optimization, not a typo-checker.

In Python 3.x, you can (untested) replace the class __dict__ with a 
custom type that has more smarts. At the cost of performance. This 
doesn't work in 2.x though, as the class __dict__ is always a regular 
dictionary.

Something like this might work, at some minor cost of performance:

# Untested
def __setattr__(self, name, value):
    if hasattr(self, name):
        super(MyClassName, self).__setattr__(name, value)
    else:
        raise TypeError('cannot create new attributes')

Then, in your __init__ method, to initialise an attribute use:

    self.__dict__['attr'] = value

to bypass the setattr.


Or you can use something like PyChecker or PyLint to analyse your code 
and warm about likely typos.

But really, it's not a common form of error. YMMV.



> Regarding properties, is there a built-in way to memoize them? For
> example, suppose that the value of a property is obtained by parsing the
> contents of a file (specified in another instance attribute). It would
> make no sense to do this parsing more than once.  Is there a standard
> idiom for memoizing the value once it is determined for the first time?

Google for "Python memoization cookbook". This will get you started:

http://code.activestate.com/recipes/52201/

Then just apply the memoize decorator to the property getter.




-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sun Mar 21 14:26:59 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 21 Mar 2010 18:26:59 GMT
Subject: Regexp problem when parsing a string
References: <mailman.1031.1269195140.23598.python-list@python.org>
Message-ID: <4ba664f3$0$27838$c3e8da3@news.astraweb.com>

On Sun, 21 Mar 2010 19:12:18 +0100, Alessandro Marino wrote:

> Could anyone help me to figure out why "None" appears in the putput?

I get:

"Attachment not shown: MIME type application/octet-stream; filename a.py"

Posting attachments to Usenet is tricky. Many newsgroups filter out 
anything they think isn't text, or even any attachment at all. Some news 
clients do the same thing.

If you have too much code to include directly in your post, then you 
should put it up on a website somewhere and just include the link.

Without looking at your code, I'd guess that using regular expressions is 
the wrong approach. Perhaps you should look at the glob module, and 
possibly os.walk.



-- 
Steven


From python at mrabarnett.plus.com  Sun Mar 21 14:31:31 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Sun, 21 Mar 2010 18:31:31 +0000
Subject: Regexp problem when parsing a string
In-Reply-To: <9b9cf8321003211112q2333fb74h29e9a805053d1a13@mail.gmail.com>
References: <9b9cf8321003211112q2333fb74h29e9a805053d1a13@mail.gmail.com>
Message-ID: <4BA66603.1010303@mrabarnett.plus.com>

Alessandro Marino wrote:
> I'm a beginner and I was trying to write a program to 
> parse recursively all file names in a directory specified as parameter. 
> The problem is that I get a "None" printed to stdout when a file is 
> positively matched. While when the file name doesn't match the regexp 
> the output seems ok. 
> 
> C:\>c:\python.exe g:\a.py sample
> ====> foo - bar.txt , first part is: foo
> None
> skipping: foo.txt
> 
> Instead I expect an output like this one:
> 
> C:\>c:\python.exe g:\a.py sample
> ====> foo - bar.txt , first part is: foo
> None
> skipping: foo.txt
> 
> Could anyone help me to figure out why "None" appears in the putput?
> 
> Thanks and regards,
> Ale
> 
It's caused by:

     print saveData(file, m)

The function saveData() returns None, which is then printed.


From lists at cheimes.de  Sun Mar 21 14:37:03 2010
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 21 Mar 2010 19:37:03 +0100
Subject: How to automate accessor definition?
In-Reply-To: <ho5k28$jge$1@dough.gmane.org>
References: <ho3heq$61v$1@reader1.panix.com>	<mailman.1018.1269125666.23598.python-list@python.org>	<ho5jf5$22l$2@reader1.panix.com>
	<ho5k28$jge$1@dough.gmane.org>
Message-ID: <ho5p0f$3ni$1@dough.gmane.org>

Steve Holden wrote:
> You may well find that namedtuple is faster than what you put together
> yourself, as the collections module is implemented in C.

But namedtuple isn't, Steve. Namedtuple is a class generator that
creates fast and efficient classes.



From pmaupin at gmail.com  Sun Mar 21 14:40:42 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sun, 21 Mar 2010 11:40:42 -0700 (PDT)
Subject: How to automate accessor definition?
References: <ho3heq$61v$1@reader1.panix.com>
	<639908184290880449.447600deets-nospam.web.de@news.hansenet.de>
	<ho5j64$22l$1@reader1.panix.com>
Message-ID: <7938941f-8d42-4b46-8b68-8f28c95df0c7@e1g2000yqh.googlegroups.com>

On Mar 21, 11:57?am, kj <no.em... at please.post> wrote:
>
> Just accessing attributes looks a bit dangerous to me, due to bugs
> like typing
>
> ? i.typo = 'foo'
>
> when what you meant is
>
> ? i.type = 'foo'
>
> I tried fixing this by mucking with __setattr__, but I didn't hit
> on a satisfactory solution (basically, I couldn't find a good,
> self-maintaining, way to specify the attributes that were OK to
> set from those that weren't). ?Is there anything built-in?
>

If you *really* want static typing and validation for attributes in
Python, you might check out enthought traits:  http://code.enthought.com/projects/traits/

Regards,
Pat


From steve at holdenweb.com  Sun Mar 21 14:47:32 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 21 Mar 2010 14:47:32 -0400
Subject: How to automate accessor definition?
In-Reply-To: <ho5p0f$3ni$1@dough.gmane.org>
References: <ho3heq$61v$1@reader1.panix.com>	<mailman.1018.1269125666.23598.python-list@python.org>	<ho5jf5$22l$2@reader1.panix.com>	<ho5k28$jge$1@dough.gmane.org>
	<ho5p0f$3ni$1@dough.gmane.org>
Message-ID: <ho5pkn$679$1@dough.gmane.org>

Christian Heimes wrote:
> Steve Holden wrote:
>> You may well find that namedtuple is faster than what you put together
>> yourself, as the collections module is implemented in C.
> 
> But namedtuple isn't, Steve. Namedtuple is a class generator that
> creates fast and efficient classes.
> 
Ah, right, thanks.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From aonlazio at gmail.com  Sun Mar 21 14:52:36 2010
From: aonlazio at gmail.com (AON LAZIO)
Date: Sun, 21 Mar 2010 14:52:36 -0400
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" 
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN 
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
Message-ID: <f9e39bbc1003211152j3a43c520qa6596bebac9a6379@mail.gmail.com>

Relax guys, let have fun once in a while


On Sat, Mar 20, 2010 at 12:18 AM, Naeem <kse.listed.co1 at gmail.com> wrote:

> "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY
> FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com       "SEXY
> RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS"
> "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE"
> "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Passion is my style
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From steve at holdenweb.com  Sun Mar 21 15:01:53 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 21 Mar 2010 15:01:53 -0400
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS"
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <f9e39bbc1003211152j3a43c520qa6596bebac9a6379@mail.gmail.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<f9e39bbc1003211152j3a43c520qa6596bebac9a6379@mail.gmail.com>
Message-ID: <ho5qfj$8dc$1@dough.gmane.org>

AON LAZIO wrote:
> Relax guys, let have fun once in a while
> 
[further repetition of the spamming URLs]

facepalm.
> 
> 
> -- 
> Passion is my style
> 
Style? You call that style?

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From Brian.Mingus at Colorado.EDU  Sun Mar 21 15:11:29 2010
From: Brian.Mingus at Colorado.EDU (Brian J Mingus)
Date: Sun, 21 Mar 2010 13:11:29 -0600
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" 
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN 
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <cd6401a1003210955u3678ad25y2d6b3f549a24cc03@mail.gmail.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com> 
	<c9d33c541003201155j4150a3a0y503d97e311618e92@mail.gmail.com> 
	<9839a05c1003201227o5112a1f1i9de3a77ba7c613ab@mail.gmail.com> 
	<cd6401a1003210955u3678ad25y2d6b3f549a24cc03@mail.gmail.com>
Message-ID: <9839a05c1003211211u2fd34964i33f8328b61bab3e8@mail.gmail.com>

On Sun, Mar 21, 2010 at 10:55 AM, Zooko O'Whielacronx <zookog at gmail.com>wrote:

> On Sat, Mar 20, 2010 at 1:27 PM, Brian J Mingus
> <Brian.Mingus at colorado.edu> wrote:
> > Moderating this stuff requires moderating all messages.
>
> Not quite. GNU Mailman comes with nice features to ease this task. You
> can configure it so that everyone who is currently subscribed can post
> freely, but new subscribers get a "moderated" bit set on them. The
> first time this new subscriber attempts to post to the list, a human
> moderator has to inspect their message and decide whether to approve
> it or deny it. If they human moderator approves it, they can also on
> the same web form remove the "moderated" bit from that poster.
>
> Therefore, the volunteer work required would be inspecting the *first*
> post from each *new* subscriber to see if that post is spam.
>
> Regards,
>
> Zooko
>

I like this approach, but I like even better simply disabling the usenet
gateway. I can't find the message now but someone mentioned it would almost
completely get rid of the spam problem. I disagree with Steve Holden that
since it's only ~1% we should just ignore it.
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From clp2 at rebertia.com  Sun Mar 21 15:57:50 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 21 Mar 2010 12:57:50 -0700
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" 
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN 
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <ho5qfj$8dc$1@dough.gmane.org>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<f9e39bbc1003211152j3a43c520qa6596bebac9a6379@mail.gmail.com>
	<ho5qfj$8dc$1@dough.gmane.org>
Message-ID: <50697b2c1003211257i3b674a20ib3d335d465e9639@mail.gmail.com>

On Sun, Mar 21, 2010 at 12:01 PM, Steve Holden <steve at holdenweb.com> wrote:
> AON LAZIO wrote:
>> Relax guys, let have fun once in a while
>>
> [further repetition of the spamming URLs]
>
> facepalm.

Fortunately, Google has now shut down the spam blog anyway.

Cheers,
Chris


From omrihsan at gmail.com  Sun Mar 21 16:44:49 2010
From: omrihsan at gmail.com (Omer Ihsan)
Date: Sun, 21 Mar 2010 13:44:49 -0700 (PDT)
Subject: device identification
Message-ID: <9c7ed2c8-f04b-4302-a4be-bde1628ef966@y11g2000prf.googlegroups.com>

i have installed pyusb now and run the sample usbenum.py....i have 3
usb ports on my PC but the results show 6 outputs to
dev.filename..they are numbers like 001 or 005 etc.... and they
changed when i plugged in devices...(i am no good with the usb
standards)....i just want to identify each device/port... what
parameter in the example would help me....



From darcy at druid.net  Sun Mar 21 17:00:06 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Sun, 21 Mar 2010 17:00:06 -0400
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
	"PRETTY GIRLS" "SEXY FRENCH GIRLS" on
	www.sexyandpretty-girls.blogspot.com
	"SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
	GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <50697b2c1003211257i3b674a20ib3d335d465e9639@mail.gmail.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<f9e39bbc1003211152j3a43c520qa6596bebac9a6379@mail.gmail.com>
	<ho5qfj$8dc$1@dough.gmane.org>
	<50697b2c1003211257i3b674a20ib3d335d465e9639@mail.gmail.com>
Message-ID: <20100321170006.03056484.darcy@druid.net>

On Sun, 21 Mar 2010 12:57:50 -0700
Chris Rebert <clp2 at rebertia.com> wrote:
> Fortunately, Google has now shut down the spam blog anyway.

Until next time.

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


From aahz at pythoncraft.com  Sun Mar 21 17:34:28 2010
From: aahz at pythoncraft.com (Aahz)
Date: 21 Mar 2010 14:34:28 -0700
Subject: Method / Functions - What are the differences?
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4B8EF717.3070701@optimum.net> <
	<mailman.555.1268232321.23598.python-list@python.org>
Message-ID: <ho63d4$2ta$1@panix5.panix.com>

In article <mailman.555.1268232321.23598.python-list at python.org>,
John Posner  <jjposner at optimum.net> wrote:
>
>Bruno (and anyone else interested) --
>
>As I promised/threatened, here's the *start* of a write-up on 
>properties, aimed at non-advanced Python programmers:
>
>   http://www.jjposner.net/media/python-properties-0310.pdf

I'm interested, but not interested enough to download a PDF and fire up
a PDF reader.  Are you really using features that require PDF instead of
just writing a web page?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From tjreedy at udel.edu  Sun Mar 21 18:00:59 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 21 Mar 2010 18:00:59 -0400
Subject: How to keep effects of image filters going for some seconds?
In-Reply-To: <b151eeba-1e33-4f9e-b6c4-678af8cc5540@v20g2000prc.googlegroups.com>
References: <b151eeba-1e33-4f9e-b6c4-678af8cc5540@v20g2000prc.googlegroups.com>
Message-ID: <ho64uu$bv7$1@dough.gmane.org>

On 3/21/2010 3:23 AM, Ren Wenshan wrote:
> Hello, every pythoner.
>
> Firstly, I want to mention that English is my second language, so
> maybe there are some sentences which makes you confused, sorry.
>
> I have been learning Panda3D, an open source 3D engine, these days.
> Now, I'm trying to write a small game for fun and practice. However,
> I've ran into a problem.
>
> I want to make some speical effects and there is my code:
>
> def ventose(self):
>
>      global potato_HP
>
>      if potato_HP[0] == 1 and potato_HP[1] == 0:
>      if random()>  .30:
>          self.filters.setCartoonInk(separation = 0.8)
>          self.robotVincent.resetHead.start()
>          self.decreaseVincentHP()
>              Wait(3)
>              self.fliters.delCartoonInk()
>
> However, it doesn't work, the CartoonInk effect will never been shown
> in my game and I don't want my game to wait three seconds, what I need
> is to keep the effect for a period of time while the game run as well.

The generic answer is to turn CartoonInk on and set a timed event for 
now+ 3 secs to turn it off. You will have to understand how to interact 
with the Panda event loop. For a more specific answer, follow Donn's 
advice -- Panda forum. I know there was one when I looked at Panda a 
year ago.

> Besides that, I also want to show a counting back like "3", then "2",
> then "1", finally "Go".

Ok, instead to events set 1 sec in future.

Terry Jan Reedy



From tjreedy at udel.edu  Sun Mar 21 18:06:05 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 21 Mar 2010 18:06:05 -0400
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS"
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <cd6401a1003210955u3678ad25y2d6b3f549a24cc03@mail.gmail.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>	<9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com>	<c9d33c541003201155j4150a3a0y503d97e311618e92@mail.gmail.com>	<9839a05c1003201227o5112a1f1i9de3a77ba7c613ab@mail.gmail.com>
	<cd6401a1003210955u3678ad25y2d6b3f549a24cc03@mail.gmail.com>
Message-ID: <ho658a$bv7$2@dough.gmane.org>

On 3/21/2010 12:55 PM, Zooko O'Whielacronx wrote:
> On Sat, Mar 20, 2010 at 1:27 PM, Brian J Mingus
> <Brian.Mingus at colorado.edu>  wrote:
>> Moderating this stuff requires moderating all messages.
>
> Not quite. GNU Mailman comes with nice features to ease this task. You
> can configure it so that everyone who is currently subscribed can post
> freely, but new subscribers get a "moderated" bit set on them. The
> first time this new subscriber attempts to post to the list, a human
> moderator has to inspect their message and decide whether to approve
> it or deny it. If they human moderator approves it, they can also on
> the same web form remove the "moderated" bit from that poster.
>
> Therefore, the volunteer work required would be inspecting the *first*
> post from each *new* subscriber to see if that post is spam.

The first time I post to *any* mailing list from gmane, gmane holds the 
message until I respond to an email. So python-list could pass new posts 
from gmane while at least auto-querying anything from google.



From tjreedy at udel.edu  Sun Mar 21 18:10:44 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 21 Mar 2010 18:10:44 -0400
Subject: [RELEASED] Python 3.1.2
In-Reply-To: <1afaf6161003211012r30bc0e77ub5dfe9f248668525@mail.gmail.com>
References: <1afaf6161003211012r30bc0e77ub5dfe9f248668525@mail.gmail.com>
Message-ID: <ho65h1$bv7$3@dough.gmane.org>

On 3/21/2010 1:12 PM, Benjamin Peterson wrote:
> On behalf of the Python development team, I'm joyful to announce the second
> bugfix release of the Python 3.1 series, Python 3.1.2.

Thanks for the work.

> This bug fix release fixes numerous issues found in 3.1.1, and is considered a
> production release.
>
> The Python 3.1 version series focuses on the stabilization and optimization of
> the features and changes that Python 3.0 introduced.  For example, the new I/O
> system has been rewritten in C for speed.  File system APIs that use unicode
> strings now handle paths with undecodable bytes in them. Other features include
> an ordered dictionary implementation, a condensed syntax for nested with
> statements, and support for ttk Tile in Tkinter.  For a more extensive list of
> changes in 3.1, see http://doc.python.org/3.1/whatsnew/3.1.html or Misc/NEWS in
> the Python distribution.
>
> To download Python 3.1.2 visit:
>
>       http://www.python.org/download/releases/3.1.2/
>
> A list of changes in 3.1.2 can be found here:
>
>       http://svn.python.org/projects/python/tags/r312/Misc/NEWS

There seem to be about a hundred fixes.

> The 3.1 documentation can be found at:
>
>       http://docs.python.org/3.1
>
> Bugs can always be reported to:
>
>       http://bugs.python.org



From steve at holdenweb.com  Sun Mar 21 18:44:11 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 21 Mar 2010 18:44:11 -0400
Subject: Method / Functions - What are the differences?
In-Reply-To: <ho63d4$2ta$1@panix5.panix.com>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>	<4B8EF717.3070701@optimum.net>
	<	<mailman.555.1268232321.23598.python-list@python.org>
	<ho63d4$2ta$1@panix5.panix.com>
Message-ID: <ho67gh$in1$1@dough.gmane.org>

Aahz wrote:
> In article <mailman.555.1268232321.23598.python-list at python.org>,
> John Posner  <jjposner at optimum.net> wrote:
>> Bruno (and anyone else interested) --
>>
>> As I promised/threatened, here's the *start* of a write-up on 
>> properties, aimed at non-advanced Python programmers:
>>
>>   http://www.jjposner.net/media/python-properties-0310.pdf
> 
> I'm interested, but not interested enough to download a PDF and fire up
> a PDF reader.  Are you really using features that require PDF instead of
> just writing a web page?

For us standard browser users it's a single click, of course.

Are you really forced to use an environment that can't start a PDF
reader by clicking on a link?

I appreciate that some people are disabled in ways that rule out reading
a PDF, but since John has gone to some personal trouble to write this
document he's surely entitled to choose his medium ...

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From janssen at parc.xerox.com  Sun Mar 21 18:50:13 2010
From: janssen at parc.xerox.com (Bill Janssen)
Date: Sun, 21 Mar 2010 15:50:13 PDT
Subject: using Python distutils bdist_msi to create installer for large
	complicated package
Message-ID: <61250.1269211813@parc.com>

Martin,

I've been re-thinking the UpLib Windows installer technology, and it
occurred to me to wonder why I can't just use the nice bdist_msi module
in Python to build my packages.  I took a look, and it seems almost
doable.  Presumably you wrote it?

UpLib is a big package, with lots of Python and Java and C programs, and
for Windows I package it with lots of other programs like those from
xpdf.  All of this is installed in C:\Program Files\UpLib\VERSION\, in
bin, lib, share, and so forth subdirectories.  If I autogenerated a
setup.py file which described everything as "data_files", it should be
simple to package everything up in a Cab, and bdist_msi apparently also
provides the ability to add pre- and post-install scripts.  Everything
I need, really.

There are a couple of Python-specific options in the code: the "Product
Name" is prefixed with the python version, and in the GUI, the default
location is the location of a Python distro.  If the package had a
"--non-python" option which would defeat these, and perhaps also set
"no-target-optimize" and "no-target-compile" to True, it would be a
simple but pretty general-purpose packager module.

I'll subclass it and play around a bit.

Bill



From ben+python at benfinney.id.au  Sun Mar 21 18:50:58 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Mon, 22 Mar 2010 09:50:58 +1100
Subject: should writing Unicode files be so slow
References: <hnu9gl$fg7e$1@uns-a.ucl.ac.uk> <8739zxw057.fsf@benfinney.id.au>
	<hnvpfj$7k76$1@uns-a.ucl.ac.uk> <87ljdov59q.fsf@benfinney.id.au>
	<ho0bkp$cc3g$1@uns-a.ucl.ac.uk>
	<mailman.993.1269044370.23598.python-list@python.org>
	<ho5ah6$eo6s$1@uns-a.ucl.ac.uk>
Message-ID: <87bpehthkd.fsf@benfinney.id.au>

djc <slais-www at ucl.ac.uk> writes:

> I shall concentrate on finding an optimal time to upgrade from Python
> 2.6.

Note that Python 2.7, though nearly ready, is not yet released
<URL:http://www.python.org/download/releases/>.

-- 
 \            ?? Nature ? is seen to do all things Herself and through |
  `\         herself of own accord, rid of all gods.? ?Titus Lucretius |
_o__)                                                 Carus, c. 40 BCE |
Ben Finney


From martin at v.loewis.de  Sun Mar 21 19:00:30 2010
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Mon, 22 Mar 2010 00:00:30 +0100
Subject: using Python distutils bdist_msi to create installer for large
	complicated package
In-Reply-To: <61250.1269211813@parc.com>
References: <61250.1269211813@parc.com>
Message-ID: <4BA6A50E.9060108@v.loewis.de>

> I've been re-thinking the UpLib Windows installer technology, and it
> occurred to me to wonder why I can't just use the nice bdist_msi module
> in Python to build my packages.  I took a look, and it seems almost
> doable.  Presumably you wrote it?

Correct.

> UpLib is a big package, with lots of Python and Java and C programs, and
> for Windows I package it with lots of other programs like those from
> xpdf.  All of this is installed in C:\Program Files\UpLib\VERSION\, in
> bin, lib, share, and so forth subdirectories.  If I autogenerated a
> setup.py file which described everything as "data_files", it should be
> simple to package everything up in a Cab, and bdist_msi apparently also
> provides the ability to add pre- and post-install scripts.  Everything
> I need, really.
> 
> There are a couple of Python-specific options in the code: the "Product
> Name" is prefixed with the python version, and in the GUI, the default
> location is the location of a Python distro.  If the package had a
> "--non-python" option which would defeat these, and perhaps also set
> "no-target-optimize" and "no-target-compile" to True, it would be a
> simple but pretty general-purpose packager module.

I'd rather recommend to base this off msilib directly, instead of trying
to subvert bdist_msi to do what you want. There is actually quite a lot
python-specifics in bdist_msi. If you find this too tedious to use,
please propose *base classes* that could become part of msilib, rather
than trying to create *subclasses* of the bdist_msi classes.

Regards,
Martin



From john at castleamber.com  Sun Mar 21 19:10:01 2010
From: john at castleamber.com (John Bokma)
Date: Sun, 21 Mar 2010 17:10:01 -0600
Subject: Method / Functions - What are the differences?
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4B8EF717.3070701@optimum.net>
	<mailman.555.1268232321.23598.python-list@python.org>
	<ho63d4$2ta$1@panix5.panix.com>
Message-ID: <87pr2xjmpi.fsf@castleamber.com>

aahz at pythoncraft.com (Aahz) writes:

> In article <mailman.555.1268232321.23598.python-list at python.org>,
> John Posner  <jjposner at optimum.net> wrote:
>>
>>Bruno (and anyone else interested) --
>>
>>As I promised/threatened, here's the *start* of a write-up on 
>>properties, aimed at non-advanced Python programmers:
>>
>>   http://www.jjposner.net/media/python-properties-0310.pdf
>
> I'm interested, but not interested enough to download a PDF and fire up
> a PDF reader.  Are you really using features that require PDF instead of
> just writing a web page?

http://docs.google.com/viewer?url=http%3A%2F%2Fwww.jjposner.net%2Fmedia%2Fpython-properties-0310.pdf

Hth,

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


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Subject: sell:nike shoes$32,ed hardy(items),jean$30,handbag$35
Message-ID: <e9799560-0693-46ef-9fde-8cc3f5731eea@z3g2000yqz.googlegroups.com>

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From jjposner at optimum.net  Sun Mar 21 19:28:43 2010
From: jjposner at optimum.net (John Posner)
Date: Sun, 21 Mar 2010 19:28:43 -0400
Subject: Method / Functions - What are the differences?
In-Reply-To: <ho63d4$2ta$1@panix5.panix.com>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4B8EF717.3070701@optimum.net> <
	<mailman.555.1268232321.23598.python-list@python.org>
	<ho63d4$2ta$1@panix5.panix.com>
Message-ID: <4BA6ABAB.5060807@optimum.net>

On 3/21/2010 5:34 PM, Aahz wrote:
> In article<mailman.555.1268232321.23598.python-list at python.org>,
> John Posner<jjposner at optimum.net>  wrote:
>>
>> Bruno (and anyone else interested) --
>>
>> As I promised/threatened, here's the *start* of a write-up on
>> properties, aimed at non-advanced Python programmers:
>>
>>    http://www.jjposner.net/media/python-properties-0310.pdf
>
> I'm interested, but not interested enough to download a PDF and fire up
> a PDF reader.  Are you really using features that require PDF instead of
> just writing a web page?


No, I compose text using a WYSIWYG editor, and I assumed that PDF was a 
convenient format for others.

I've been working on the writeup, and marking it up for use on the 
Python Wiki. So I've gone ahead and published it:

  http://wiki.python.org/moin/ComputedAttributesUsingPropertyObjects

For good measure, I've also been working on an updated writeup for 
"property" in the "Built-in Functions" section of the official Python 
docs. A draft is in HTML format at:

  http://cl1p.net/jjp_python_property_ref.html/

Thanks for your interest! All comments are most welcome.

-John




From ldo at geek-central.gen.new_zealand  Sun Mar 21 19:36:35 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Mon, 22 Mar 2010 12:36:35 +1300
Subject: GC is very expensive: am I doing something wrong?
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
	<mailman.963.1268958842.23598.python-list@python.org>
Message-ID: <ho6ai4$b12$2@lust.ihug.co.nz>

In message <mailman.963.1268958842.23598.python-list at python.org>, Terry 
Reedy wrote:

> No one has discovered a setting
> of the internal tuning parameters for which there are no bad patterns
> and I suspect there are not any such. This does not negate Xavier's
> suggestion that a code change might also solve your problem.

Could it be that for implementing a structure like a trie as the OP is, 
where a lot of CPU cycles can be spent manipulating the structure, a high-
level language like Python, Perl or Ruby just gets in the way?

My feeling would be, try to get the language to do as much of the work for 
you as possible. If you can?t do that, then you might be better off with a 
lower-level language.


From twentyqstns at gmail.com  Sun Mar 21 19:47:59 2010
From: twentyqstns at gmail.com (twenty questions)
Date: Sun, 21 Mar 2010 16:47:59 -0700 (PDT)
Subject: add an entry to twentyquestions.org  (please)
Message-ID: <73490ec3-5d3f-417a-b0fc-c697cd0fb08a@30g2000yqi.googlegroups.com>

add an entry to http://www.twentyquestions.org  (please)


From rasky at develer.com  Sun Mar 21 19:50:00 2010
From: rasky at develer.com (Giovanni Bajo)
Date: Mon, 22 Mar 2010 00:50:00 +0100
Subject: [ANN] PyInstaller 1.4
Message-ID: <1269215400.3170.12.camel@ozzu>

Hello,

I'm happy to announce PyInstaller 1.4, the first formal release after
several years of quiet development.

   http://www.pyinstaller.org


=== What it is ===

PyInstaller is a program that converts (packages) Python programs into
stand-alone executables, under Windows, Linux, and Mac OS X. It's
similar to py2exe/py2app, but it is multiplatform and with many advanced
features.

The main goal of PyInstaller is to be compatible with 3rd-party packages
out-of-the-box. This means that, with PyInstaller, all the required
tricks to make external packages work are already integrated within
PyInstaller itself so that there is no user intervention required.
You'll never be required to look for tricks in wikis and apply custom
modification to your files or your setup scripts.

=== Features ===

      * Packaging of Python programs into standard executables, that
        work on computers without Python installed.
      * Multiplatform: works under Windows, Linux and Irix. Experimental
        Mac OS X support available.
      * Multiversion: works under any version of Python from 1.5 up to
        2.6. NOTE: Support for Python 2.6+ on Windows is not included in
        this release yet. Please see this page for a working patch:
        http://www.pyinstaller.org/wiki/Python26Win
      * Flexible packaging mode:
              * Single directory: build a directory containing an
                executable plus all the external binary modules
                (.dll, .pyd, .so) used by the program.
              * Single file: build a single executable file, totally
                self-contained, which runs without any external
                dependency.
              * Custom: you can automate PyInstaller to do whatever
                packaging mode you want through a simple script file in
                Python.
      * Explicit intelligent support for many 3rd-packages (for hidden
        imports, external data files, etc.), to make them work with
        PyInstaller out-of-the-box.
      * Full single-file EGG support: .egg files are automatically
        packaged by PyInstaller as-is, so that all features are
        supported at runtime as well (entry points, etc.).
      * Automatic support for binary libraries used through ctypes (see
        http://www.pyinstaller.org/wiki/CtypesDependencySupport for
        details).
      * Support for automatic binary packing through the well-known UPX
        compressor.
      * Support for code-signing executables on Windows.
      * Optional console mode (see standard output and standard error at
        runtime).
      * Selectable executable icon (Windows only).
      * Fully configurable version resource section in executable
        (Windows only).
      * Support for building COM servers (Windows only).

=== ChangeLog ===

For those already using older versions of PyInstaller, the full
changelog for this release can be found here:

   http://www.pyinstaller.org/browser/tags/1.4/doc/CHANGES.txt


=== Feedback ===

We're eager to listent to your feedback on using PyInstaller:

 Ticketing system: http://www.pyinstaller.org/newticket
 Mailing list: http://groups-beta.google.com/group/PyInstaller



-- 
Giovanni Bajo      ::  Develer S.r.l.
rasky at develer.com  ::  http://www.develer.com

Blog: http://giovanni.bajo.it
Last post: ctypes support in PyInstaller




From janssen at parc.com  Sun Mar 21 19:52:35 2010
From: janssen at parc.com (Bill Janssen)
Date: Sun, 21 Mar 2010 16:52:35 PDT
Subject: using Python distutils bdist_msi to create installer for large
	complicated package
In-Reply-To: <4BA6A50E.9060108@v.loewis.de>
References: <61250.1269211813@parc.com> <4BA6A50E.9060108@v.loewis.de>
Message-ID: <63771.1269215555@parc.com>

Martin v. L?wis <martin at v.loewis.de> wrote:

> > I've been re-thinking the UpLib Windows installer technology, and it
> > occurred to me to wonder why I can't just use the nice bdist_msi module
> > in Python to build my packages.  I took a look, and it seems almost
> > doable.  Presumably you wrote it?
> 
> Correct.
> 
> > UpLib is a big package, with lots of Python and Java and C programs, and
> > for Windows I package it with lots of other programs like those from
> > xpdf.  All of this is installed in C:\Program Files\UpLib\VERSION\, in
> > bin, lib, share, and so forth subdirectories.  If I autogenerated a
> > setup.py file which described everything as "data_files", it should be
> > simple to package everything up in a Cab, and bdist_msi apparently also
> > provides the ability to add pre- and post-install scripts.  Everything
> > I need, really.
> > 
> > There are a couple of Python-specific options in the code: the "Product
> > Name" is prefixed with the python version, and in the GUI, the default
> > location is the location of a Python distro.  If the package had a
> > "--non-python" option which would defeat these, and perhaps also set
> > "no-target-optimize" and "no-target-compile" to True, it would be a
> > simple but pretty general-purpose packager module.
> 
> I'd rather recommend to base this off msilib directly, instead of trying
> to subvert bdist_msi to do what you want.

Yes, that was the first thing I looked at.  But as you've pointed out in
the past, it requires a lot of MSI know-how to use that library
directly.  For a variety of applications, you've already embedded most
if not all of that know-how in the bdist_msi class.  And subclassing
is the indicated way to build on distutils, isn't it?

> There is actually quite a lot python-specifics in bdist_msi.

Well, sort of.  If a setup only references "data_files" -- no Python
packages, no extensions -- it's pretty generic.

The "add_find_python" method seems the most python-specific.  I'd
remove a lot of that in the generic case.  And, of course, modify "run"
so that the product name isn't prefixed with "Python x.y".

> If you find this too tedious to use,
> please propose *base classes* that could become part of msilib, rather
> than trying to create *subclasses* of the bdist_msi classes.

Yes, good idea.  For example, all those panels that are in get_ui
could be added by a InstallerBaseGUI class of some sort.

But still, just a few mods to bdist_msi could go a long way.  For
instance, you've already pulled out "get_installer_filename". I'd add a
similar method, "get_product_name", which would typically just return
the user-specific name, but in the default case could prefix the product
name with Python 2.6.

Bill


From mailers at oranged.to  Sun Mar 21 20:12:00 2010
From: mailers at oranged.to (Jimmy Stewpot)
Date: Mon, 22 Mar 2010 00:12:00 +0000 (UTC)
Subject: Best practise for dual stack programming in python
Message-ID: <58492962.583.1269216720829.JavaMail.root@poops.oranged.to>

Hello,

The organisation that I currently work for has a large number of 'legacy' tools and scripts which rely entirely on IPv4. Many of them have been written and not documented etc. The organisation is in the process of moving to a dual stack environment over the next 3 months. With that in mind many of our scripts need to be rewritten and documented. I have been looking at moving from a mix of languages over to a standard which at this point is looking like it will be Python (because I am most familiar with it). I have never done any dual stack coding so I am interested to know if there are any good resources for developing dual stack python code?

I have had a look around and have found very little on the python web page which makes me worry. Does anyone have any recommendations on web pages to read or books to look at?

Any additional advice would be really appreciated.

Regards,

Jimmy Stewpot. 


From no.email at please.post  Sun Mar 21 21:36:19 2010
From: no.email at please.post (kj)
Date: Mon, 22 Mar 2010 01:36:19 +0000 (UTC)
Subject: How to automate accessor definition?
References: <ho3heq$61v$1@reader1.panix.com>
	<639908184290880449.447600deets-nospam.web.de@news.hansenet.de>
	<ho5j64$22l$1@reader1.panix.com>
	<4ba66311$0$27838$c3e8da3@news.astraweb.com>
Message-ID: <ho6hij$1el$1@reader1.panix.com>

In <4ba66311$0$27838$c3e8da3 at news.astraweb.com> Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:

>Then, in your __init__ method, to initialise an attribute use:

>    self.__dict__['attr'] = value

>to bypass the setattr.

Ah, that's the trick!  Thanks!

~K


From ben+python at benfinney.id.au  Sun Mar 21 21:46:07 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Mon, 22 Mar 2010 12:46:07 +1100
Subject: add an entry to twentyquestions.org  (please)
References: <73490ec3-5d3f-417a-b0fc-c697cd0fb08a@30g2000yqi.googlegroups.com>
Message-ID: <8739ztt9gg.fsf@benfinney.id.au>

twenty questions <twentyqstns at gmail.com> writes:

> add an entry to http://www.twentyquestions.org  (please)

Don't spam groups with your off-topic begging for a closed database silo
(please)

-- 
 \        ?Our nylons cost more than common, but you'll find that they |
  `\                           are best in the long run.? ?shop, Tokyo |
_o__)                                                                  |
Ben Finney


From agoretoy at gmail.com  Sun Mar 21 22:04:15 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Sun, 21 Mar 2010 20:04:15 -0600
Subject: execute bash builtins in python
In-Reply-To: <7f014ea61003171114j60aa2a2co19e138e46ea4ee4d@mail.gmail.com>
References: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com> 
	<mailman.660.1268399795.23598.python-list@python.org>
	<pan.2010.03.17.15.44.34.750000@nowhere.com> 
	<7f014ea61003171114j60aa2a2co19e138e46ea4ee4d@mail.gmail.com>
Message-ID: <c9d33c541003211904s78ab5f70kac5625cbc766f6d7@mail.gmail.com>

Thank you for the great suggestions. Steve Holden that is a good one, I will
try to adapt my application to your suggestion. This way I don't have to
source .bashrc when it could do all that for me including other things that
it does in the background. Thank you so much.

Nobody, I was not aware of that shell arg thing, thank you.

Ipython is ok, but in this case I would have to force another dependency,
which I'm trying to keep those as low as possible for such a small
application. In fact, I'm gonna remove desktopcouch (couchdb) as one of the
deps in the next release of courtesyflush. Expect the next release sometime
late next week, if you interested in the app. find it on launchpad. :)
Enjoy.

Thank you,
-Alex Goretoy
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From tjreedy at udel.edu  Sun Mar 21 22:39:44 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 21 Mar 2010 22:39:44 -0400
Subject: Best practise for dual stack programming in python
In-Reply-To: <58492962.583.1269216720829.JavaMail.root@poops.oranged.to>
References: <58492962.583.1269216720829.JavaMail.root@poops.oranged.to>
Message-ID: <ho6l9g$mac$1@dough.gmane.org>

On 3/21/2010 8:12 PM, Jimmy Stewpot wrote:
> Hello,
>
> The organisation that I currently work for has a large number of
> 'legacy' tools and scripts which rely entirely on IPv4. Many of them
> have been written and not documented etc. The organisation is in the
> process of moving to a dual stack environment over the next 3 months.
> With that in mind many of our scripts need to be rewritten and
> documented. I have been looking at moving from a mix of languages
> over to a standard which at this point is looking like it will be
> Python (because I am most familiar with it). I have never done any
> dual stack coding so I am interested to know if there are any good
> resources for developing dual stack python code? I have had a look
> around and have found very little on the python web page which makes
> me worry. Does anyone have any recommendations on web pages to read
> or books to look at?

There are at least 2 ip address libraries which handle both ip4 and ip6. 
One is Google's package,
http://pypi.python.org/pypi/ipaddr/2.0.0
I forget the name of the other, which covers a bit more than the above 
with a slightly different conceptual model. Would these help.

Terry Jan Reedy



From sam at tregar.com  Sun Mar 21 23:08:36 2010
From: sam at tregar.com (Sam Tregar)
Date: Sun, 21 Mar 2010 23:08:36 -0400
Subject: [ANN] onlinepayment v1.0.0 released
In-Reply-To: <fe3354e51003211630j547007c3k4fda6092d0c66677@mail.gmail.com>
References: <fe3354e51003211630j547007c3k4fda6092d0c66677@mail.gmail.com>
Message-ID: <fe3354e51003212008j7a43c199n9ad6fd0487cebb85@mail.gmail.com>

onlinepayment v1.0.0 - a generic Python API for making online payments

This module provides an API wrapper around a variety of payment
providers.  Using this module you can write code that will work the
same regardless of the payment provider in use.

Examples::

   from onlinepayment import OnlinePayment

   # connect to authorize.net, setup auth with login and key
   auth= { 'login': 'YOUR LOGIN HERE',
           'key':   'YOUR KEY HERE' }

   op = OnlinePayment('authnet', test_mode=True, auth=auth)

   # or for paypal, setup auth with user, pass, vendor and product:
   auth= { 'username': 'YOUR USERNAME HERE',
           'password': 'YOUR PASSWORD HERE',
           'vendor':   'YOUR VENDOR HERE',
           'product':  'YOUR PRODUCT HERE' }

   # connect to PayPal
   op = OnlinePayment('paypal', test_mode=True, auth=auth)

   # charge a card
   try:
       result = op.sale(first_name = 'Joe',
                        last_name  = 'Example',
                        address    = '100 Example Ln.',
                        city       = 'Exampleville',
                        state      = 'NY',
                        zip        = '10001',
                        amount     = '2.00',
                        card_num   = '4007000000027',
                        exp_date   = '0530',
                        card_code  = '1234')

   except conn.TransactionDeclined:
      # do something when the transaction fails

   except conn.CardExpired:
      # tell the user their card is expired

   except conn.ProcessorException:
      # handle all other possible processor-generated exceptions generically

   # examine result, the values returned here are processor-specific
   success  = result.success
   code     = result.code
   message  = result.message
   trans_id = result.trans_id

   # you can get the raw data returned by the underlying processor too
   orig = result.orig

Installation
============

Before you can use this module you must install one or more payment
processors.  To install the PayPal payflowpro package::

  # easy_install pytz
  # easy_install python-payflowpro

To install the zc.authorizedotnet package and the authorize package
(for recurring support)::

  # easy_install zc.authorizedotnet
  # easy_install authorize

If you want authorize.net support you'll need to install a patched
version of zc.ssl.  Hopefully someday this will be released by the
Zope devs, but so far I haven't heard anything back.  Download the
zc.ssl source package from http://pypi.python.org/pypi/zc.ssl/, then
unpack::

  # tar zxvf zc.ssl-1.1.tar.gz
  # cd zc.ssl-1.1

Now download and apply my zc-ssl-timeout.patch::

  # wget
http://python-onlinepayment.googlecode.com/svn/trunk/zc-ssl-timeout.patch
  # patch -p1 < /zc-ssl-timeout.patch

And install the patched module::

  # python setup.py install

(You may also need to edit setup.py and remove the
'ssl-for-setuptools' dependecy.  I did, although it may be a quirk of
my Python install rather than a general problem.)

Once you have a payment processor you can install this module::

  # easy_install onlinepayment

For more information see: http://pypi.python.org/pypi/onlinepayment/1.0.0
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From maymunbeyin at gmail.com  Sun Mar 21 23:45:51 2010
From: maymunbeyin at gmail.com (kuru)
Date: Sun, 21 Mar 2010 20:45:51 -0700 (PDT)
Subject: DreamPie - The Python shell you've always dreamed about!
References: <6c6a96e0-be08-4ec3-a002-0bb9232a8afd@f29g2000yqa.googlegroups.com>
Message-ID: <3c11d8e6-ea2d-43d6-a9c9-5c23a52fba8f@l25g2000yqd.googlegroups.com>

Thanks for the shell. It is nice alternative , however I am not ready
to give up Ipython :)

If the code ends with a comment line your shell is giving an error.

Feature request: It would be nice to have numbered lines in the code
section, it makes it hard to find problem line
Feature request: Loading an actual Python file rather than copy
pasting

keep up the good work


From zookog at gmail.com  Mon Mar 22 01:09:46 2010
From: zookog at gmail.com (Zooko O'Whielacronx)
Date: Sun, 21 Mar 2010 23:09:46 -0600
Subject: StringChain -- a data structure for managing large sequences of 
	chunks of bytes
In-Reply-To: <4b9a00ce$0$27822$c3e8da3@news.astraweb.com>
References: <mailman.646.1268377905.23598.python-list@python.org>
	<4b9a00ce$0$27822$c3e8da3@news.astraweb.com>
Message-ID: <cd6401a1003212209l175f26c8t4a8d924a6f823972@mail.gmail.com>

Folks:

I failed to make something sufficiently clear in my original message
about StringChain. The use case that I am talking about is not simply
that you need to accumulate a sequence of incoming chunks of data,
concatenate them together, and then process the entire result. If that
is all you need to do then indeed you can accumulate the incoming
strings in a list and then run ''.join(thelist) when you have received
all of them and are ready to process them.

But the use case that I am talking about is where you need to
accumulate new incoming strings into your buffer while alternately
processing leading prefixes of the buffer. The typical example is that
sequences of bytes are arriving on your TCP socket and you are
processing the stream incrementally. You need to process the leading
prefixes of the stream as soon as you can (e.g. as soon as a line
followed by a newline has accumulated, or as soon as another complete
element in your data format has accumulated, etc.); you can't simply
wait until the bytes stop coming and then concatenate the entire
collection together at once.

This is exactly the current situation in foolscap [1] which is causing
a performance problem in Tahoe-LAFS [2].

To illustrate what I mean I cooked up some benchmarks showing the task
of "accumulate a bunch of things then consume them in a single gulp"
versus the task of "alternate between accumulating and consuming"
(with accumulation going faster than consumption until the input
stream runs dry).

I implemented a few data structures for benchmarking: StringChain, the
naive "accumulatorstr += newstr" approach (named "Stringy" in the
benchmarks), one based on cStringIO (named "StringIOy"), one based on
accumulating the new strings into a list and then doing
''.join(accumulatorlist) whenever you need to consume a leading prefix
(called "SimplerStringChain").

Below are the abbreviated results of the benchmark. You can easily run
this benchmark yourself by following the README.txt in the StringChain
source package [3]. These results show that for the load imposed by
this benchmark StringChain is the only one of the four that scales and
that it is also nice and fast.

The left-hand column is the total number of bytes that were run
through it. The results are shown in nanoseconds per byte in
exponential notation. ("e+01" means times 10, "e+02" means times 100,
and "e+03" means times 1000, etc.) Each result is the best of 10
tries, or of 5 tries for the tasks which were taking too long to run
it 10 times.

Regards,

Zooko

[1] http://foolscap.lothar.com/trac/ticket/149
[2] http://allmydata.org/pipermail/tahoe-dev/2010-March/004181.html
[3] http://tahoe-lafs.org/trac/stringchain

impl:  StringChain
task:  _accumulate_then_one_gulp
  10000 best: 2.694e+00
  50000 best: 2.742e+00
 100000 best: 2.310e+00
 500000 best: 2.040e+00
1000000 best: 1.988e+00
5000000 best: 2.193e+00

task:  _alternate_str
  10000 best: 6.509e+00
  50000 best: 4.559e+00
 100000 best: 4.308e+00
 500000 best: 4.070e+00
1000000 best: 3.991e+00
5000000 best: 4.000e+00

impl:  SimplerStringChain
task:  _accumulate_then_one_gulp
  10000 best: 1.407e+00
  50000 best: 2.317e+00
 100000 best: 2.012e+00
 500000 best: 1.902e+00
1000000 best: 1.897e+00
5000000 best: 2.104e+00

task:  _alternate_str
  10000 best: 4.888e+00
  50000 best: 5.198e+00
 100000 best: 1.750e+01
 500000 best: 6.233e+01
1000000 best: 1.134e+02
5000000 best: 7.599e+02

impl:  StringIOy
task:  _accumulate_then_one_gulp
  10000 best: 4.196e+00
  50000 best: 5.522e+00
 100000 best: 4.499e+00
 500000 best: 3.756e+00
1000000 best: 4.176e+00
5000000 best: 5.414e+00

task:  _alternate_str
  10000 best: 5.484e+00
  50000 best: 7.863e+00
 100000 best: 2.126e+01
 500000 best: 6.972e+01
1000000 best: 1.219e+02
5000000 best: 9.463e+02

task:  _accumulate_then_one_gulp
  10000 best: 1.502e+00
  50000 best: 1.420e+01
 100000 best: 2.245e+01
 500000 best: 8.577e+01
1000000 best: 2.295e+02
5000000 best: 1.326e+03

task:  _alternate_str
  10000 best: 3.290e+00
  50000 best: 4.220e+00
 100000 best: 1.665e+01
 500000 best: 6.281e+01
1000000 best: 1.127e+02
5000000 best: 7.626e+02


From mws42262 at yahoo.com  Mon Mar 22 01:29:57 2010
From: mws42262 at yahoo.com (sam)
Date: Sun, 21 Mar 2010 22:29:57 -0700 (PDT)
Subject: ------->>>FREE MAC<<<-------
Message-ID: <26c5c978-e176-4ff4-afb5-68eef6c466b7@33g2000yqj.googlegroups.com>

http://michellemichaeldiscounts.com/16801.html


From aram1980 at gmail.com  Mon Mar 22 03:22:01 2010
From: aram1980 at gmail.com (Aram Ter-Sarkissov)
Date: Mon, 22 Mar 2010 00:22:01 -0700 (PDT)
Subject: nonuniform sampling with replacement
References: <0c333952-2150-4207-90e8-7bb3f2bc7c4c@b9g2000pri.googlegroups.com>
	<ho51tp$g6f$1@news.eternal-september.org>
	<ho53d3$o12$1@news.eternal-september.org>
Message-ID: <a06b5f5d-f612-47d5-b32d-3fe2102b2c2f@z1g2000prc.googlegroups.com>

On 22 ???, 01:28, "Alf P. Steinbach" <al... at start.no> wrote:
> * Alf P. Steinbach:
>
>
>
> > * Jah_Alarm:
> >> I've got a vector length n of integers (some of them are repeating),
> >> and I got a selection probability vector of the same length. How will
> >> I sample with replacement k (<=n) values with the probabilty vector.
> >> In Matlab this function is randsample. I couldn't find anything to
> >> this extent in Scipy or Numpy.
>
> > <code>
> [snip]
> > </code>
>
> > Disclaimer: I just cooked it up and just cooked up binary searches
> > usually have bugs. They usually need to be exercised and fixed. But I
> > think you get the idea. Note also that division differs in Py3 and Py2.
> > This is coded for Py3.
>
> Sorry, I realized this just now: the name "p" in the choice() method is utterly
> misleading, which you can see from the call; it's a random number not a
> probability. I guess my fingers just repeated what they typed earlier.
>
> Cheeers,
>
> - Alf (repeat typist)

thanks a lot

alex


From aram1980 at gmail.com  Mon Mar 22 03:24:16 2010
From: aram1980 at gmail.com (Aram Ter-Sarkissov)
Date: Mon, 22 Mar 2010 00:24:16 -0700 (PDT)
Subject: nonuniform sampling with replacement
References: <0c333952-2150-4207-90e8-7bb3f2bc7c4c@b9g2000pri.googlegroups.com>
	<ho53bu$eeh$03$1@news.t-online.com>
Message-ID: <db3688ad-5473-4c86-918b-c9aa58570578@b9g2000pri.googlegroups.com>

On 22 ???, 01:27, Peter Otten <__pete... at web.de> wrote:
> Jah_Alarm wrote:
> > I've got a vector length n of integers (some of them are repeating),
> > and I got a selection probability vector of the same length. How will
> > I sample with replacement k (<=n) values with the probabilty vector.
> > In Matlab this function is randsample. I couldn't find anything to
> > this extent in Scipy or Numpy.
>
> If all else fails you can do it yourself:
>
> import random
> import bisect
>
> def iter_sample_with_replacement(values, weights):
> ? ? _random = random.random
> ? ? _bisect = bisect.bisect
>
> ? ? acc_weights = []
> ? ? sigma = 0
> ? ? for w in weights:
> ? ? ? ? sigma += w
> ? ? ? ? acc_weights.append(sigma)
> ? ? while 1:
> ? ? ? ? yield values[_bisect(acc_weights, _random()*sigma)]
>
> def sample_with_replacement(k, values, weights):
> ? ? return list(islice(iter_sample_with_replacement(values, weights), k))
>
> if __name__ == "__main__":
> ? ? from itertools import islice
> ? ? N = 10**6
> ? ? values = range(4)
> ? ? weights = [2, 3, 4, 1]
>
> ? ? histo = [0] * len(values)
> ? ? for v in islice(iter_sample_with_replacement(values, weights), N):
> ? ? ? ? histo[v] += 1
> ? ? print histo
> ? ? print sample_with_replacement(30, values, weights)
>
> Peter

thanks a lot,

Alex


From agoretoy at gmail.com  Mon Mar 22 03:32:36 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Mon, 22 Mar 2010 01:32:36 -0600
Subject: execute bash builtins in python
In-Reply-To: <c9d33c541003211904s78ab5f70kac5625cbc766f6d7@mail.gmail.com>
References: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com> 
	<mailman.660.1268399795.23598.python-list@python.org>
	<pan.2010.03.17.15.44.34.750000@nowhere.com> 
	<7f014ea61003171114j60aa2a2co19e138e46ea4ee4d@mail.gmail.com> 
	<c9d33c541003211904s78ab5f70kac5625cbc766f6d7@mail.gmail.com>
Message-ID: <c9d33c541003220032j610a5339l7a502abd5389c141@mail.gmail.com>

I do have a problem however that I don't know how to solve. My application
dies abruptly at random times because of this and I get this output error in
the terminal:

bash: line 0: declare: write error: Broken pipe

and sometimes it crashes and I get this output error; this one maybe gtk
related, yes?

*** glibc detected *** /usr/bin/python: double free or corruption (fasttop):
0xb650fa78 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6[0x17aff1]
/lib/tls/i686/cmov/libc.so.6[0x17c6f2]
/lib/tls/i686/cmov/libc.so.6(cfree+0x6d)[0x17f7cd]
/lib/libglib-2.0.so.0(g_free+0x36)[0x7a3196]
/usr/lib/libgdk-x11-2.0.so.0[0x27faba]
/usr/lib/libgdk-x11-2.0.so.0(gdk_region_union+0x8e)[0x28129e]
/usr/lib/libgdk-x11-2.0.so.0[0x28e26c]
/usr/lib/libgdk-x11-2.0.so.0(gdk_window_invalidate_maybe_recurse+0x243)[0x28eb33]
/usr/lib/libgdk-x11-2.0.so.0(gdk_window_invalidate_maybe_recurse+0x206)[0x28eaf6]
/usr/lib/libgtk-x11-2.0.so.0[0x28b5893]
/usr/lib/libgtk-x11-2.0.so.0[0x28b6cff]
/usr/lib/libgtk-x11-2.0.so.0(gtk_widget_queue_resize+0x75)[0x28bcaa5]
/usr/lib/libgtk-x11-2.0.so.0[0x288b557]
/usr/lib/libgobject-2.0.so.0(g_cclosure_marshal_VOID__BOXED+0x88)[0x320068]
/usr/lib/libgobject-2.0.so.0(g_closure_invoke+0x1b2)[0x313072]
/usr/lib/libgobject-2.0.so.0[0x3287a8]
/usr/lib/libgobject-2.0.so.0(g_signal_emit_valist+0x7bd)[0x329b2d]
/usr/lib/libgobject-2.0.so.0(g_signal_emit+0x26)[0x329fb6]
/usr/lib/libgtk-x11-2.0.so.0(gtk_tree_model_row_deleted+0x9a)[0x28751da]
/usr/lib/libgtk-x11-2.0.so.0(gtk_list_store_remove+0x114)[0x278e9e4]
/usr/lib/libgtk-x11-2.0.so.0(gtk_list_store_clear+0x90)[0x278eab0]
/usr/lib/pymodules/python2.6/gtk-2.0/gtk/_gtk.so[0x10b64a1]
/usr/bin/python(PyEval_EvalFrameEx+0x4175)[0x80dbfd5]
/usr/bin/python(PyEval_EvalFrameEx+0x5524)[0x80dd384]
/usr/bin/python(PyEval_EvalCodeEx+0x7d2)[0x80dddf2]
/usr/bin/python[0x816014c]
/usr/bin/python(PyObject_Call+0x4a)[0x806120a]
/usr/bin/python[0x80684ac]
/usr/bin/python(PyObject_Call+0x4a)[0x806120a]
/usr/bin/python(PyEval_CallObjectWithKeywords+0x42)[0x80d6ef2]
/usr/bin/python(PyObject_CallObject+0x20)[0x80612a0]
/usr/lib/pymodules/python2.6/gtk-2.0/gobject/_gobject.so[0xd4503e]
/usr/lib/libgobject-2.0.so.0(g_closure_invoke+0x1b2)[0x313072]
/usr/lib/libgobject-2.0.so.0[0x3287a8]
/usr/lib/libgobject-2.0.so.0(g_signal_emit_valist+0x7bd)[0x329b2d]
/usr/lib/libgobject-2.0.so.0(g_signal_emit+0x26)[0x329fb6]
/usr/lib/libgtk-x11-2.0.so.0[0x26fb8dc]
/usr/lib/libgobject-2.0.so.0(g_cclosure_marshal_VOID__BOXED+0x88)[0x320068]
/usr/lib/libgobject-2.0.so.0(g_closure_invoke+0x1b2)[0x313072]
/usr/lib/libgobject-2.0.so.0[0x3287a8]
/usr/lib/libgobject-2.0.so.0(g_signal_emit_valist+0x7bd)[0x329b2d]
/usr/lib/libgobject-2.0.so.0(g_signal_emit+0x26)[0x329fb6]
/usr/lib/libgtk-x11-2.0.so.0(gtk_tree_model_row_deleted+0x9a)[0x28751da]
/usr/lib/libgtk-x11-2.0.so.0(gtk_list_store_remove+0x114)[0x278e9e4]
/usr/lib/libgtk-x11-2.0.so.0(gtk_list_store_clear+0x90)[0x278eab0]
/usr/lib/pymodules/python2.6/gtk-2.0/gtk/_gtk.so[0x10b64a1]
/usr/bin/python(PyEval_EvalFrameEx+0x4175)[0x80dbfd5]
/usr/bin/python(PyEval_EvalFrameEx+0x5524)[0x80dd384]
/usr/bin/python[0x815de2f]
/usr/bin/python(PyEval_EvalFrameEx+0x95f)[0x80d87bf]
/usr/bin/python(PyEval_EvalCodeEx+0x7d2)[0x80dddf2]
/usr/bin/python[0x816022f]
/usr/bin/python(PyObject_Call+0x4a)[0x806120a]
/usr/bin/python(PyEval_EvalFrameEx+0x30b9)[0x80daf19]
/usr/bin/python(PyEval_EvalFrameEx+0x5524)[0x80dd384]
/usr/bin/python(PyEval_EvalFrameEx+0x5524)[0x80dd384]
/usr/bin/python(PyEval_EvalCodeEx+0x7d2)[0x80dddf2]
/usr/bin/python[0x816014c]
/usr/bin/python(PyObject_Call+0x4a)[0x806120a]
/usr/bin/python[0x80684ac]
/usr/bin/python(PyObject_Call+0x4a)[0x806120a]
/usr/bin/python(PyEval_CallObjectWithKeywords+0x42)[0x80d6ef2]
/usr/bin/python[0x8107d88]
======= Memory map: ========
00110000-0024e000 r-xp 00000000 08:06 688127     /lib/tls/i686/cmov/
libc-2.10.1.so
0024e000-0024f000 ---p 0013e000 08:06 688127     /lib/tls/i686/cmov/
libc-2.10.1.so
0024f000-00251000 r--p 0013e000 08:06 688127     /lib/tls/i686/cmov/
libc-2.10.1.so
00251000-00252000 rw-p 00140000 08:06 688127     /lib/tls/i686/cmov/
libc-2.10.1.so
00252000-00255000 rw-p 00000000 00:00 0
00255000-002e7000 r-xp 00000000 08:06 198090
/usr/lib/libgdk-x11-2.0.so.0.1800.3
002e7000-002e9000 r--p 00092000 08:06 198090
/usr/lib/libgdk-x11-2.0.so.0.1800.3
002e9000-002ea000 rw-p 00094000 08:06 198090
/usr/lib/libgdk-x11-2.0.so.0.1800.3
002ea000-00305000 r-xp 00000000 08:06 198967
/usr/lib/libatk-1.0.so.0.2809.1
00305000-00306000 r--p 0001b000 08:06 198967
/usr/lib/libatk-1.0.so.0.2809.1
00306000-00307000 rw-p 0001c000 08:06 198967
/usr/lib/libatk-1.0.so.0.2809.1
00307000-00308000 rwxp 00000000 00:00 0
00308000-00344000 r-xp 00000000 08:06 196888
/usr/lib/libgobject-2.0.so.0.2200.3
00344000-00345000 r--p 0003b000 08:06 196888
/usr/lib/libgobject-2.0.so.0.2200.3
00345000-00346000 rw-p 0003c000 08:06 196888
/usr/lib/libgobject-2.0.so.0.2200.3
00346000-00351000 r-xp 00000000 08:06 199652
/usr/lib/libpangocairo-1.0.so.0.2600.0
00351000-00352000 r--p 0000a000 08:06 199652
/usr/lib/libpangocairo-1.0.so.0.2600.0
00352000-00353000 rw-p 0000b000 08:06 199652
/usr/lib/libpangocairo-1.0.so.0.2600.0
00353000-003e6000 r-xp 00000000 08:06 197035
/usr/lib/libgio-2.0.so.0.2200.3
003e6000-003e7000 r--p 00092000 08:06 197035
/usr/lib/libgio-2.0.so.0.2200.3
003e7000-003e8000 rw-p 00093000 08:06 197035
/usr/lib/libgio-2.0.so.0.2200.3
003e8000-003e9000 rw-p 00000000 00:00 0
003e9000-003eb000 r-xp 00000000 08:06 198888
/usr/lib/libXcomposite.so.1.0.0
003eb000-003ec000 r--p 00001000 08:06 198888
/usr/lib/libXcomposite.so.1.0.0
003ec000-003ed000 rw-p 00002000 08:06 198888
/usr/lib/libXcomposite.so.1.0.0
003ed000-003ef000 r-xp 00000000 08:06 198892
/usr/lib/libXdamage.so.1.1.0
003ef000-003f0000 rw-p 00001000 08:06 198892
/usr/lib/libXdamage.so.1.1.0
003f0000-003f4000 r-xp 00000000 08:06 198898     /usr/lib/libXfixes.so.3.1.0
003f4000-003f5000 r--p 00003000 08:06 198898     /usr/lib/libXfixes.so.3.1.0
003f5000-003f6000 rw-p 00004000 08:06 198898     /usr/lib/libXfixes.so.3.1.0
003f6000-00404000 r-xp 00000000 08:06 198896     /usr/lib/libXext.so.6.4.0
00404000-00405000 r--p 0000d000 08:06 198896     /usr/lib/libXext.so.6.4.0
00405000-00406000 rw-p 0000e000 08:06 198896     /usr/lib/libXext.so.6.4.0
00406000-0040e000 r-xp 00000000 08:06 198918
/usr/lib/libXrender.so.1.3.0
0040e000-0040f000 r--p 00007000 08:06 198918
/usr/lib/libXrender.so.1.3.0
0040f000-00410000 rw-p 00008000 08:06 198918
/usr/lib/libXrender.so.1.3.0
00410000-00425000 r-xp 00000000 08:06 688141     /lib/tls/i686/cmov/
libpthread-2.10.1.so
00425000-00426000 r--p 00014000 08:06 688141     /lib/tls/i686/cmov/
libpthread-2.10.1.so
00426000-00427000 rw-p 00015000 08:06 688141     /lib/tls/i686/cmov/
libpthread-2.10.1.so
00427000-00429000 rw-p 00000000 00:00 0
00429000-0042b000 r-xp 00000000 08:06 198906
/usr/lib/libXinerama.so.1.0.0
0042b000-0042c000 rw-p 00001000 08:06 198906
/usr/lib/libXinerama.so.1.0.0
0042c000-00435000 r-xp 00000000 08:06 198904     /usr/lib/libXi.so.6.0.0
00435000-00436000 r--p 00008000 08:06 198904     /usr/lib/libXi.so.6.0.0
00436000-00437000 rw-p 00009000 08:06 198904     /usr/lib/libXi.so.6.0.0
00437000-00440000 r-xp 00000000 08:06 198890
/usr/lib/libXcursor.so.1.0.2
00440000-00441000 r--p 00008000 08:06 198890
/usr/lib/libXcursor.so.1.0.2
00441000-00442000 rw-p 00009000 08:06 198890
/usr/lib/libXcursor.so.1.0.2
00442000-00452000 r-xp 00000000 08:06 688142     /lib/tls/i686/cmov/
libresolv-2.10.1.so
00452000-00453000 r--p 00010000 08:06 688142     /lib/tls/i686/cmov/
libresolv-2.10.1.so
00453000-00454000 rw-p 00011000 08:06 688142     /lib/tls/i686/cmov/
libresolv-2.10.1.so
00454000-00456000 rw-p 00000000 00:00 0
00456000-0045e000 r-xp 00000000 08:06 199193
/usr/lib/libfusion-1.2.so.0.7.0
0045e000-0045f000 r--p 00007000 08:06 199193
/usr/lib/libfusion-1.2.so.0.7.0
0045f000-00460000 rw-p 00008000 08:06 199193
/usr/lib/libfusion-1.2.so.0.7.0
00460000-00463000 r-xp 00000000 08:06 199911
/usr/lib/libxcb-render-util.so.0.0.0
00463000-00464000 r--p 00002000 08:06 199911
/usr/lib/libxcb-render-util.so.0.0.0
00464000-00465000 rw-p 00003000 08:06 199911
/usr/lib/libxcb-render-util.so.0.0.0
00465000-0046c000 r-xp 00000000 08:06 199913
/usr/lib/libxcb-render.so.0.0.0
0046c000-0046d000 r--p 00007000 08:06 199913
/usr/lib/libxcb-render.so.0.0.0
0046d000-0046e000 rw-p 00008000 08:06 199913
/usr/lib/libxcb-render.so.0.0.0
0046e000-00486000 r-xp 00000000 08:06 198092
/usr/lib/libgdk_pixbuf-2.0.so.0.1800.3
00486000-00487000 r--p 00017000 08:06 198092
/usr/lib/libgdk_pixbuf-2.0.so.0.1800.3
00487000-00488000 rw-p 00018000 08:06 198092
/usr/lib/libgdk_pixbuf-2.0.so.0.1800.3
00488000-004ff000 r-xp 00000000 08:06 196251
/usr/lib/libcairo.so.2.10800.8
004ff000-00501000 r--p 00076000 08:06 196251
/usr/lib/libcairo.so.2.10800.8
00501000-00502000 rw-p 00078000 08:06 196251
/usr/lib/libcairo.so.2.10800.8
00502000-00548000 r-xp 00000000 08:06 199650
/usr/lib/libpango-1.0.so.0.2600.0
00548000-00549000 r--p 00045000 08:06 199650
/usr/lib/libpango-1.0.so.0.2600.0
00549000-0054a000 rw-p 00046000 08:06 199650
/usr/lib/libpango-1.0.so.0.2600.0
0054a000-0054e000 r-xp 00000000 08:06 198894     /usr/lib/libXdmcp.so.6.0.0
0054e000-0054f000 rw-p 00003000 08:06 198894     /usr/lib/libXdmcp.so.6.0.0
0054f000-00550000 r-xp 00000000 08:06 230770
/usr/lib/gtk-2.0/2.10.0/loaders/svg_loader.so
00550000-00551000 r--p 00001000 08:06 230770
/usr/lib/gtk-2.0/2.10.0/loaders/svg_loader.so
00551000-00552000 rw-p 00002000 08:06 230770
/usr/lib/gtk-2.0/2.10.0/loaders/svg_loader.so
00552000-00566000 r-xp 00000000 08:06 670607     /lib/libz.so.1.2.3.3
00566000-00567000 r--p 00013000 08:06 670607     /lib/libz.so.1.2.3.3
00567000-00568000 rw-p 00014000 08:06 670607     /lib/libz.so.1.2.3.3
00568000-00581000 r-xp 00000000 08:06 670575     /lib/libselinux.so.1
00581000-00582000 r--p 00018000 08:06 670575     /lib/libselinux.so.1
00582000-00583000 rw-p 00019000 08:06 670575     /lib/libselinux.so.1
00583000-005c7000 r-xp 00000000 08:06 199680
/usr/lib/libpixman-1.so.0.14.0
005c7000-005c9000 r--p 00043000 08:06 199680
/usr/lib/libpixman-1.so.0.14.0
005c9000-005ca000 rw-p 00045000 08:06 199680
/usr/lib/libpixman-1.so.0.14.0
005ca000-005e0000 r-xp 00000000 08:06 199106
/usr/lib/libdirect-1.2.so.0.7.0

Thank you,
-Alex Goretoy
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From stefan_ml at behnel.de  Mon Mar 22 03:42:07 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Mon, 22 Mar 2010 08:42:07 +0100
Subject: GC is very expensive: am I doing something wrong?
In-Reply-To: <ho6ai4$b12$2@lust.ihug.co.nz>
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>	<mailman.963.1268958842.23598.python-list@python.org>
	<ho6ai4$b12$2@lust.ihug.co.nz>
Message-ID: <ho770f$tgd$1@dough.gmane.org>

Lawrence D'Oliveiro, 22.03.2010 00:36:
> Terry Reedy wrote:
>> No one has discovered a setting
>> of the internal tuning parameters for which there are no bad patterns
>> and I suspect there are not any such. This does not negate Xavier's
>> suggestion that a code change might also solve your problem.
>
> Could it be that for implementing a structure like a trie as the OP is,
> where a lot of CPU cycles can be spent manipulating the structure, a high-
> level language like Python, Perl or Ruby just gets in the way?

I would rather say that the specific problem of the trie data structure is 
that it has extremely little benefit over other available data structures. 
There may still be a couple of niches where it makes sense to consider it 
as an alternative, but given that dicts are so heavily optimised in Python, 
it'll be hard for tries to compete even when written in a low-level language.

Remember that the original use case was to load a dictionary from a text 
file. For this use case, a trie can be very wasteful in terms of memory and 
rather CPU cache unfriendly on traversal, whereas hash values are a) rather 
fast to calculate for a string, and b) often just calculated once and then 
kept alive in the string object for later reuse.


> My feeling would be, try to get the language to do as much of the work for
> you as possible. If you can?t do that, then you might be better off with a
> lower-level language.

I agree with the first sentence, but I'd like to underline the word 'might' 
in the second. As this newsgroup shows, very often it's enough to look for 
a better algorithmic approach first.

Stefan



From agoretoy at gmail.com  Mon Mar 22 04:01:15 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Mon, 22 Mar 2010 02:01:15 -0600
Subject: execute bash builtins in python
In-Reply-To: <c9d33c541003220032j610a5339l7a502abd5389c141@mail.gmail.com>
References: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com> 
	<mailman.660.1268399795.23598.python-list@python.org>
	<pan.2010.03.17.15.44.34.750000@nowhere.com> 
	<7f014ea61003171114j60aa2a2co19e138e46ea4ee4d@mail.gmail.com> 
	<c9d33c541003211904s78ab5f70kac5625cbc766f6d7@mail.gmail.com> 
	<c9d33c541003220032j610a5339l7a502abd5389c141@mail.gmail.com>
Message-ID: <c9d33c541003220101o3164544n1e4edab641f99fec@mail.gmail.com>

for the broken pipe error, perhaps theres a different way I can get shell
output other than using subprocess? I need the output of alias command into
a string and output of declare command into a string as well, I would like
to also avoid creating of a single liner script to make this happen if at
all possible

Thank you,
-Alex Goretoy
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From steven at REMOVE.THIS.cybersource.com.au  Mon Mar 22 04:07:49 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 22 Mar 2010 08:07:49 GMT
Subject: StringChain -- a data structure for managing large sequences of 
	chunks of bytes
References: <mailman.646.1268377905.23598.python-list@python.org>
	<4b9a00ce$0$27822$c3e8da3@news.astraweb.com>
	<mailman.1055.1269234593.23598.python-list@python.org>
Message-ID: <pan.2010.03.22.08.07.48@REMOVE.THIS.cybersource.com.au>

On Sun, 21 Mar 2010 23:09:46 -0600, Zooko O'Whielacronx wrote:

> But the use case that I am talking about is where you need to accumulate
> new incoming strings into your buffer while alternately processing
> leading prefixes of the buffer.
[...]
> Below are the abbreviated results of the benchmark. You can easily run
> this benchmark yourself by following the README.txt in the StringChain
> source package [3]. These results show that for the load imposed by this
> benchmark StringChain is the only one of the four that scales and that
> it is also nice and fast.

I was reading this email, and thinking "Why do you need this StringChain 
data structure, from the description it sounds like a job for 
collections.deque?"

And funnily enough, following the links you supplied I came across this:

"You can get the package from  http://pypi.python.org/pypi/stringchain or 
with darcs get http://tahoe-lafs.org/source/stringchain/trunk. It has 
unit tests. It is in pure Python (it uses collections.deque and string)."

http://tahoe-lafs.org/trac/stringchain


Perhaps you should have said that it was a wrapper around deque giving 
richer functionality, rather than giving the impression that it was a 
brand new data structure invented by you. People are naturally going to 
be more skeptical about a newly invented data structure than one based on 
a reliable, component like deque.

In any case, it looks to me that the StringChain data structure itself is 
a little too application specific for me to be personally interested in 
it. Maybe you should consider linking to it on PyPI and seeing if there 
is any interest from others?



Regards,





Steven


From agoretoy at gmail.com  Mon Mar 22 06:15:29 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Mon, 22 Mar 2010 04:15:29 -0600
Subject: execute bash builtins in python
In-Reply-To: <c9d33c541003220101o3164544n1e4edab641f99fec@mail.gmail.com>
References: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com> 
	<mailman.660.1268399795.23598.python-list@python.org>
	<pan.2010.03.17.15.44.34.750000@nowhere.com> 
	<7f014ea61003171114j60aa2a2co19e138e46ea4ee4d@mail.gmail.com> 
	<c9d33c541003211904s78ab5f70kac5625cbc766f6d7@mail.gmail.com> 
	<c9d33c541003220032j610a5339l7a502abd5389c141@mail.gmail.com> 
	<c9d33c541003220101o3164544n1e4edab641f99fec@mail.gmail.com>
Message-ID: <c9d33c541003220315v217c464btb796ebd8baa442a4@mail.gmail.com>

actually using the -i param in the command to subprocess doesn't seem to
work as well as setting PS1 to some garbage, it starts a new interactive
shell therein kicking me out of python. :/

Thank you,
-Alex Goretoy
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From jeanmichel at sequans.com  Mon Mar 22 06:35:21 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 22 Mar 2010 11:35:21 +0100
Subject: Tuples vs. variable-length argument lists
In-Reply-To: <843bf1a3-6e9b-48d2-8661-b3f776a6fde2@t32g2000prg.googlegroups.com>
References: <843bf1a3-6e9b-48d2-8661-b3f776a6fde2@t32g2000prg.googlegroups.com>
Message-ID: <4BA747E9.5020009@sequans.com>

Spencer Pearson wrote:
> Hi!
>
> This might be more of a personal-preference question than anything,
> but here goes: when is it appropriate for a function to take a list or
> tuple as input, and when should it allow a varying number of
> arguments? It seems as though the two are always interchangeable. For
> a simple example...
>
> def subtract( x, nums ):
>   return x - sum( nums )
>
> ... works equally well if you define it as "subtract( x, *nums )" and
> put an asterisk in front of any lists/tuples you pass it. I can't
> think of any situation where you couldn't convert from one form to the
> other with just a star or a pair of parentheses.
>
> Is there a generally accepted convention for which method to use? Is
> there ever actually a big difference between the two that I'm not
> seeing?
>   
FYI some linters report the usage of * as bad practice, I don't know the 
reason though. Pylint reports it as using 'magic'.
Anyway the form without * is commonly used.

JM


From ldo at geek-central.gen.new_zealand  Mon Mar 22 07:00:30 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 23 Mar 2010 00:00:30 +1300
Subject: What is pkg-config for ?
References: <ad871976-202d-4495-8294-2047573b565b@c16g2000yqd.googlegroups.com>
	<mailman.987.1269033144.23598.python-list@python.org>
Message-ID: <ho7ike$2lv$1@lust.ihug.co.nz>

In message <mailman.987.1269033144.23598.python-list at python.org>, Gabriel 
Genellina wrote:

> I fail to see how is this relevant to Python...

Well, so many of the questions in this noisegroup seem to be about Windows 
problems, not Python ones... :)


From jeanmichel at sequans.com  Mon Mar 22 07:01:00 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 22 Mar 2010 12:01:00 +0100
Subject: accessing variable of the __main__ module
In-Reply-To: <4ba4bc88$0$29961$426a74cc@news.free.fr>
References: <4ba4bc88$0$29961$426a74cc@news.free.fr>
Message-ID: <4BA74DEC.90006@sequans.com>

News123 wrote:
> Hi,
>
>
> I wondered about the best way, that a  module's function could determine
> the existance and value of variables in the __main__ module.
>
>
> What I came up with is:
> ########### main.py ##########
> import mod
> A = 4
> if __name__ == "__main__": mod.f()
> ########### mod.py ##########
> def f():
>     try:
>         from __main__ import A
>     except ImportError as e:
>         A = "does not exist"
>     print "__main__.A" ,A
>
> Is there anything better / more pythonic?
>
> Thanks in advance and bye
>
>
> N
>   
The 'was I imported from that module' is usually some sign of bad 
design. I can't detail more wihtout further detail of what you're trying 
to achieve. Bud since what you have is working, I would'nt bother more 
than that cause no matter what you try, it will be ugly :o).

JM


From newton10471 at gmail.com  Mon Mar 22 09:26:45 2010
From: newton10471 at gmail.com (newton10471)
Date: Mon, 22 Mar 2010 06:26:45 -0700 (PDT)
Subject: chroot fails with mount point passed to subprocess.Popen?
Message-ID: <6a601e7c-7a89-4747-a25c-a78743fe47ab@g4g2000yqa.googlegroups.com>

Hi,

I'm trying to use subprocess.Popen() to do a Linux chroot to a mount
point passed in as a parameter to the following function:

def getInstalledKernelVersion(mountPoint):
    linuxFsRoot = mountPoint + "/root"
    print "type of linuxFsRoot is %s" % type(linuxFsRoot)
    installedKernelVersionResult =
subprocess.Popen(['chroot',linuxFsRoot,'rpm','-q','kernel-xen'])
    return installedKernelVersionResult

and it dies with the following:

type of linuxFsRoot is <type 'str'>
chroot: cannot change root directory to /storage/mounts/
mnt_3786314034939740895.mnt/root: No such file or directory

When I explicitly set linuxFsRoot = "/storage/mounts/
mnt_3786314034939740895.mnt/root", it works fine.

I also tried this to concatenate the mountpoint + /root, and it failed
in the same way:

linuxFsRoot = ("%s/root") % mountPoint

Anyone know what might be happening here?

Thanks in advance,

Matt Newton


From alfps at start.no  Mon Mar 22 09:33:31 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Mon, 22 Mar 2010 14:33:31 +0100
Subject: chroot fails with mount point passed to subprocess.Popen?
In-Reply-To: <6a601e7c-7a89-4747-a25c-a78743fe47ab@g4g2000yqa.googlegroups.com>
References: <6a601e7c-7a89-4747-a25c-a78743fe47ab@g4g2000yqa.googlegroups.com>
Message-ID: <ho7rjf$lki$1@news.eternal-september.org>

* newton10471:
> Hi,
> 
> I'm trying to use subprocess.Popen() to do a Linux chroot to a mount
> point passed in as a parameter to the following function:
> 
> def getInstalledKernelVersion(mountPoint):
>     linuxFsRoot = mountPoint + "/root"
>     print "type of linuxFsRoot is %s" % type(linuxFsRoot)
>     installedKernelVersionResult =
> subprocess.Popen(['chroot',linuxFsRoot,'rpm','-q','kernel-xen'])
>     return installedKernelVersionResult
> 
> and it dies with the following:
> 
> type of linuxFsRoot is <type 'str'>
> chroot: cannot change root directory to /storage/mounts/
> mnt_3786314034939740895.mnt/root: No such file or directory
> 
> When I explicitly set linuxFsRoot = "/storage/mounts/
> mnt_3786314034939740895.mnt/root", it works fine.
> 
> I also tried this to concatenate the mountpoint + /root, and it failed
> in the same way:
> 
> linuxFsRoot = ("%s/root") % mountPoint

Use the os.path functions.


> Anyone know what might be happening here?

Since the computed and literal paths /look/ identical and same type, the only 
thing I can imagine is that there is some invisible character. Try comparing the 
computed and literal path character by character. Print the difference or if 
they're identical, that they are.

Possibly you have GIGO problem.


Cheers & hth.,

- Alf


From no.email at please.post  Mon Mar 22 09:54:27 2010
From: no.email at please.post (kj)
Date: Mon, 22 Mar 2010 13:54:27 +0000 (UTC)
Subject: How to automate accessor definition?
References: <ho3heq$61v$1@reader1.panix.com>
	<639908184290880449.447600deets-nospam.web.de@news.hansenet.de>
	<ho5j64$22l$1@reader1.panix.com>
	<mailman.1030.1269194878.23598.python-list@python.org>
Message-ID: <ho7sqi$jq$1@reader1.panix.com>

In <mailman.1030.1269194878.23598.python-list at python.org> Dennis Lee Bieber <wlfraed at ix.netcom.com> writes:

>On Sun, 21 Mar 2010 16:57:40 +0000 (UTC), kj <no.email at please.post>
>declaimed the following in gmane.comp.python.general:

>> Regarding properties, is there a built-in way to memoize them? For
>> example, suppose that the value of a property is obtained by parsing
>> the contents of a file (specified in another instance attribute).
>> It would make no sense to do this parsing more than once.  Is there
>> a standard idiom for memoizing the value once it is determined for
>> the first time?
>>
>	Pickle, Shelve? Maybe in conjunction with SQLite3...

I was thinking of something less persistent; in-memory, that is.
Maybe something in the spirit of:

@property
def foo(self):
    # up for some "adaptive auto-redefinition"?
    self.foo = self._some_time_consuming_operation()
    return self.foo

...except that that assignment won't work! It bombs with "AttributeError:
can't set attribute".

~K

PS: BTW, this is not the first time that attempting to set an
attribute (in a class written by me even) blows up on me.  It's
situations like these that rattle my grasp of attributes, hence my
original question about boring, plodding, verbose Java-oid accessors.
For me these Python attributes are still waaay too mysterious and
unpredictable to rely on.  Sometimes one can set them, sometimes
not, and I can't quite tell the two situations apart.  It's all
very confusing to the Noob.  (I'm sure this is all documented
*somewhere*, but this does not make using attributes any more
intuitive or straightforward.  I'm also sure that *eventually*,
with enough Python experience under one's belt, this all becomes
second nature.  My point is that Python attributes are not as
transparent and natural to the uninitiated as some of you folks
seem to think.)


From alfps at start.no  Mon Mar 22 10:22:02 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Mon, 22 Mar 2010 15:22:02 +0100
Subject: How to automate accessor definition?
In-Reply-To: <ho7sqi$jq$1@reader1.panix.com>
References: <ho3heq$61v$1@reader1.panix.com>
	<639908184290880449.447600deets-nospam.web.de@news.hansenet.de>
	<ho5j64$22l$1@reader1.panix.com>
	<mailman.1030.1269194878.23598.python-list@python.org>
	<ho7sqi$jq$1@reader1.panix.com>
Message-ID: <ho7ueg$bi6$1@news.eternal-september.org>

* kj:
> In <mailman.1030.1269194878.23598.python-list at python.org> Dennis Lee Bieber <wlfraed at ix.netcom.com> writes:
> 
>> On Sun, 21 Mar 2010 16:57:40 +0000 (UTC), kj <no.email at please.post>
>> declaimed the following in gmane.comp.python.general:
> 
>>> Regarding properties, is there a built-in way to memoize them? For
>>> example, suppose that the value of a property is obtained by parsing
>>> the contents of a file (specified in another instance attribute).
>>> It would make no sense to do this parsing more than once.  Is there
>>> a standard idiom for memoizing the value once it is determined for
>>> the first time?
>>>
>> 	Pickle, Shelve? Maybe in conjunction with SQLite3...
> 
> I was thinking of something less persistent; in-memory, that is.
> Maybe something in the spirit of:
> 
> @property
> def foo(self):
>     # up for some "adaptive auto-redefinition"?
>     self.foo = self._some_time_consuming_operation()
>     return self.foo
> 
> ...except that that assignment won't work! It bombs with "AttributeError:
> can't set attribute".

Since foo is a read only property you can assign to it.

But it doesn't matter: if it worked technically it wouldn't give you what you're 
after, the once-only evaluation.

A simple way to do that, in the sense of copying code and having it work, is to 
use a generator that, after evaluating the expensive op, loops forever yielding 
the resulting value.

A probably more efficient way, and anyway one perhaps more easy to understand, 
is as follows:


<code>
from __future__ import print_function

class LazyEval:
     def __init__( self, f ):
         self._f = f
         self._computed = False

     @property
     def value( self ):
         if not self._computed:
             self._value = self._f()
             self._computed = True
         return self._value

class HiHo:
     def _expensive_op( self ):
         print( "Expensive op!" )
         return 42

     def __init__( self ):
         self._foo = LazyEval( self._expensive_op )

     @property
     def foo( self ):
         return self._foo.value

o = HiHo()
for i in range( 5 ):
     print( o.foo )
</code>


Cheers & hth.,

- Alf


From albert at spenarnc.xs4all.nl  Mon Mar 22 10:26:10 2010
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 22 Mar 2010 14:26:10 GMT
Subject: subtraction is giving me a syntax error
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
Message-ID: <kzotfm.8ve@spenarnc.xs4all.nl>

In article <56597268-3472-4fd9-a829-6d9cf51cf093 at e7g2000yqf.googlegroups.com>,
Joel Pendery  <joel.pendery at gmail.com> wrote:
>So I am trying to write a bit of code and a simple numerical
>subtraction
>
>y_diff = y_diff-H
>
>is giving me the error
>
>Syntaxerror: Non-ASCII character '\x96' in file on line 70, but no
>encoding declared.
>
>Even though I have deleted some lines before it and this line is no
>longer line 70, I am still getting the error every time.  I have tried
>to change the encoding of the file to utf-8 but to no avail, I still
>am having this issue.  Any ideas?

Make a hex-dump of your file. How does line 70 look?
If you see
0900 66 66 96 48 0A  --              ff.H.

you know you are doing something illegal.

>
>Thanks in advance

Groetjes Albert

P.S. With all due respect, error messages come not any clearer than
that!

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- being exponential -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From no.email at please.post  Mon Mar 22 10:45:22 2010
From: no.email at please.post (kj)
Date: Mon, 22 Mar 2010 14:45:22 +0000 (UTC)
Subject: short-circuiting any/all ?
Message-ID: <ho7vq2$1s5$1@reader1.panix.com>




I have a list of items L, and a test function is_invalid that checks
the validity of each item.  To check that there are no invalid
items in L, I could check the value of any(map(is_invalid, L)).
But this approach is suboptimal in the sense that, no matter what
L is, is_invalid will be executed for all elements of L, even though
the value returned by any() is fully determined by the first True
in its argument.  In other words, all calls to is_invalid after
the first one to return True are superfluous.  Is there a
short-circuiting counterpart to any(map(is_invalid, L)) that avoids
these superfluous calls?

OK, there's this one, of course:

def _any_invalid(L):
    for i in L:
        if is_invalid(i):
            return True
    return False   

But is there anything built-in?  (I imagine that a lazy version of
map *may* do the trick, *if* any() will let it be lazy.)

TIA!

~K


From john at castleamber.com  Mon Mar 22 10:47:09 2010
From: john at castleamber.com (John Bokma)
Date: Mon, 22 Mar 2010 08:47:09 -0600
Subject: add an entry to twentyquestions.org  (please)
References: <73490ec3-5d3f-417a-b0fc-c697cd0fb08a@30g2000yqi.googlegroups.com>
	<8739ztt9gg.fsf@benfinney.id.au>
Message-ID: <87bpeg8lci.fsf@castleamber.com>

Ben Finney <ben+python at benfinney.id.au> writes:

> twenty questions <twentyqstns at gmail.com> writes:
>
>> add an entry to http://
>
> Don't spam groups with your off-topic begging for a closed database silo
> (please)

Don't repeat spam

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From mail at timgolden.me.uk  Mon Mar 22 10:57:38 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Mon, 22 Mar 2010 14:57:38 +0000
Subject: short-circuiting any/all ?
In-Reply-To: <ho7vq2$1s5$1@reader1.panix.com>
References: <ho7vq2$1s5$1@reader1.panix.com>
Message-ID: <4BA78562.3070802@timgolden.me.uk>

On 22/03/2010 14:45, kj wrote:
> I have a list of items L, and a test function is_invalid that checks
> the validity of each item.  To check that there are no invalid
> items in L, I could check the value of any(map(is_invalid, L)).
> But this approach is suboptimal in the sense that, no matter what
> L is, is_invalid will be executed for all elements of L, even though
> the value returned by any() is fully determined by the first True
> in its argument.  In other words, all calls to is_invalid after
> the first one to return True are superfluous.  Is there a
> short-circuiting counterpart to any(map(is_invalid, L)) that avoids
> these superfluous calls?
>
> OK, there's this one, of course:
>
> def _any_invalid(L):
>      for i in L:
>          if is_invalid(i):
>              return True
>      return False
>
> But is there anything built-in?  (I imagine that a lazy version of
> map *may* do the trick, *if* any() will let it be lazy.)

Have I missed the point of your question, perhaps? This seems
to work as lazily as you'd like...

<code>
def less_than_five (x):
   print "testing", x
   return x < 5

L = range (10)
print any (less_than_five (i) for i in L)
print all (less_than_five (i) for i in L) # for symmetry

</code>

TJG


From jeanmichel at sequans.com  Mon Mar 22 11:08:49 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 22 Mar 2010 16:08:49 +0100
Subject: short-circuiting any/all ?
In-Reply-To: <ho7vq2$1s5$1@reader1.panix.com>
References: <ho7vq2$1s5$1@reader1.panix.com>
Message-ID: <4BA78801.3040605@sequans.com>

kj wrote:
>
> I have a list of items L, and a test function is_invalid that checks
> the validity of each item.  To check that there are no invalid
> items in L, I could check the value of any(map(is_invalid, L)).
> But this approach is suboptimal in the sense that, no matter what
> L is, is_invalid will be executed for all elements of L, even though
> the value returned by any() is fully determined by the first True
> in its argument.  In other words, all calls to is_invalid after
> the first one to return True are superfluous.  Is there a
> short-circuiting counterpart to any(map(is_invalid, L)) that avoids
> these superfluous calls?
>
> OK, there's this one, of course:
>
> def _any_invalid(L):
>     for i in L:
>         if is_invalid(i):
>             return True
>     return False   
>
> But is there anything built-in?  (I imagine that a lazy version of
> map *may* do the trick, *if* any() will let it be lazy.)
>
> TIA!
>
> ~K
>   
Sounds like unnecessary optimization. Just write

def _any_valid(L):
    return bool([i for i in L if is_valid(i)])

If you really care about speed, meaning if the user experiences some 
execution duration increase, then the solution you proposed is fine.


JM
   


From tim.wintle at teamrubber.com  Mon Mar 22 11:12:52 2010
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Mon, 22 Mar 2010 15:12:52 +0000
Subject: short-circuiting any/all ?
In-Reply-To: <ho7vq2$1s5$1@reader1.panix.com>
References: <ho7vq2$1s5$1@reader1.panix.com>
Message-ID: <1269270772.2407.1.camel@localhost>

On Mon, 2010-03-22 at 14:45 +0000, kj wrote:
> I have a list of items L, and a test function is_invalid that checks
> the validity of each item.  To check that there are no invalid
> items in L, I could check the value of any(map(is_invalid, L)).
> But this approach is suboptimal in the sense that, no matter what
> L is, is_invalid will be executed for all elements of L,

any( is_invalid(a) for a in L )

... generator expression will be lazily computed.

Tim



From pruebauno at latinmail.com  Mon Mar 22 11:17:03 2010
From: pruebauno at latinmail.com (nn)
Date: Mon, 22 Mar 2010 08:17:03 -0700 (PDT)
Subject: short-circuiting any/all ?
References: <ho7vq2$1s5$1@reader1.panix.com>
Message-ID: <291d82b7-b13b-4f49-901c-8194f3e07598@e7g2000yqf.googlegroups.com>



kj wrote:
> I have a list of items L, and a test function is_invalid that checks
> the validity of each item.  To check that there are no invalid
> items in L, I could check the value of any(map(is_invalid, L)).
> But this approach is suboptimal in the sense that, no matter what
> L is, is_invalid will be executed for all elements of L, even though
> the value returned by any() is fully determined by the first True
> in its argument.  In other words, all calls to is_invalid after
> the first one to return True are superfluous.  Is there a
> short-circuiting counterpart to any(map(is_invalid, L)) that avoids
> these superfluous calls?
>
> OK, there's this one, of course:
>
> def _any_invalid(L):
>     for i in L:
>         if is_invalid(i):
>             return True
>     return False
>
> But is there anything built-in?  (I imagine that a lazy version of
> map *may* do the trick, *if* any() will let it be lazy.)
>
> TIA!
>
> ~K

If you are in Python 3 "any(map(is_invalid, L))" should short circuit.
If you are in Python 2 use "from itertools import imap;
any(imap(is_invalid, L))"


From robert.kern at gmail.com  Mon Mar 22 11:22:29 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Mon, 22 Mar 2010 10:22:29 -0500
Subject: nonuniform sampling with replacement
In-Reply-To: <0c333952-2150-4207-90e8-7bb3f2bc7c4c@b9g2000pri.googlegroups.com>
References: <0c333952-2150-4207-90e8-7bb3f2bc7c4c@b9g2000pri.googlegroups.com>
Message-ID: <ho81vm$2ua$1@dough.gmane.org>

On 2010-03-21 05:11 AM, Jah_Alarm wrote:
> I've got a vector length n of integers (some of them are repeating),

I recommend reducing it down to unique integers first.

> and I got a selection probability vector of the same length. How will
> I sample with replacement k (<=n) values with the probabilty vector.
> In Matlab this function is randsample. I couldn't find anything to
> this extent in Scipy or Numpy.

In [19]: from scipy.stats import rv_discrete

In [20]: p = rv_discrete(name='adhoc', values=([0, 1, 2], [0.5, 0.25, 0.25]))

In [21]: p.rvs(size=100)
Out[21]:
array([0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 0, 1, 2, 2, 2, 1, 0, 0, 2, 0, 0, 1, 0,
        0, 2, 2, 0, 1, 2, 1, 0, 0, 2, 1, 1, 1, 1, 1, 2, 1, 2, 0, 2, 0, 2, 0,
        0, 2, 0, 1, 0, 2, 2, 1, 0, 0, 1, 0, 2, 1, 0, 0, 1, 0, 2, 1, 2, 1, 0,
        1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 2, 0, 1,
        2, 1, 1, 0, 0, 0, 1, 0])

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From bruno.42.desthuilliers at websiteburo.invalid  Mon Mar 22 11:44:01 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Mon, 22 Mar 2010 16:44:01 +0100
Subject: How to automate accessor definition?
In-Reply-To: <ho7sqi$jq$1@reader1.panix.com>
References: <ho3heq$61v$1@reader1.panix.com>
	<639908184290880449.447600deets-nospam.web.de@news.hansenet.de>
	<ho5j64$22l$1@reader1.panix.com>
	<mailman.1030.1269194878.23598.python-list@python.org>
	<ho7sqi$jq$1@reader1.panix.com>
Message-ID: <4ba79040$0$22397$426a74cc@news.free.fr>

kj a ?crit :
> In <mailman.1030.1269194878.23598.python-list at python.org> Dennis Lee Bieber <wlfraed at ix.netcom.com> writes:
> 
>> On Sun, 21 Mar 2010 16:57:40 +0000 (UTC), kj <no.email at please.post>
>> declaimed the following in gmane.comp.python.general:
> 
>>> Regarding properties, is there a built-in way to memoize them? For
>>> example, suppose that the value of a property is obtained by parsing
>>> the contents of a file (specified in another instance attribute).
>>> It would make no sense to do this parsing more than once.  Is there
>>> a standard idiom for memoizing the value once it is determined for
>>> the first time?
>>>
>> 	Pickle, Shelve? Maybe in conjunction with SQLite3...
> 
> I was thinking of something less persistent; in-memory, that is.
> Maybe something in the spirit of:
> 
> @property
> def foo(self):
>     # up for some "adaptive auto-redefinition"?
>     self.foo = self._some_time_consuming_operation()
>     return self.foo
> 
> ...except that that assignment won't work! It bombs with "AttributeError:
> can't set attribute".
> 
> ~K
> 
> PS: BTW, this is not the first time that attempting to set an
> attribute (in a class written by me even) blows up on me.  It's
> situations like these that rattle my grasp of attributes, hence my
> original question about boring, plodding, verbose Java-oid accessors.
> For me these Python attributes are still waaay too mysterious and
> unpredictable to rely on.

Somehow simplified, here's what you have to know:

1/ there are instance attributes and class attributes. Instance 
attributes lives in the instance's __dict__, class attributes lives in 
the class's __dict__ or in a parent's class __dict__.

2/ when looking up an attribute on an instance, the rules are
* first, check if there's a key by that name in the instance's __dict__. 
If yes, return the associated value
* else, check if there's a class or parent class attribute by that name.
* if yes
** if the attribute has a '__get__' method, call the __get__ method with 
class and instance as arguments, and return the result (this is known as 
the "descriptor protocol" and provides support for computed attributes 
(including methods and properties)
** else return the attribute itself
* else (if nothing has been found yet), look for a __getattr__ method in 
the class and it's parents. If found, call this __getattr__ method with 
the attribute name and return the result
* else, give up and raise an AttributeError

3/ When binding an attribute on an instance, the rules are:
* first, check if there's a class (or parent class) attribute by that 
name that has a '__set__' method. If yes, call this class attribute's 
__set__ method with instance and value as arguments. This is the second 
part part of the "descriptor protocol", as used by the property type.
* else, add the attribute's name and value in the instance's __dict__


As I said, this is a somehow simplified description of the process - I 
skipped the parts about __slots__, __getattribute__ and __setattr__, as 
well as the part about how function class attributes become methods. But 
this should be enough to get an idea of what's going on.

In your above case, you defined a "foo" property class attribute. The 
property type implements both __get__ and __set__, but you only defined 
a callback for the __get__ method (the function you decorated with 
'property'), so when you try to rebind "foo", the default property 
type's __set__ implementation is invoked, which behaviour is to forbid 
setting the attribute. If you want a settable property, you have to 
provide a setter too.

Now if you want a "replaceable" property-like attribute, you could 
define your own computed attribute (aka "descriptor") type _without_ a 
__set__ method:

class replaceableprop(object):
     def __init__(self, fget):
         self._fget = fget
     def __get__(self, instance, cls):
         if instance is None:
             return self
         return self._fget(instance)

@replaceableprop
def foo(self):
     # will add 'foo' into self.__dict__, s
     self.foo = self._some_time_consuming_operation()
     return self.foo


Another (better IMHO) solution is to use a plain property, and store the 
computed value as an implementation attribute :

@property
def foo(self):
   cached = self.__dict__.get('_foo_cache')
   if cached is None:
       self._foo_cache = cached = self._some_time_consuming_operation()
   return cached


>  Sometimes one can set them, sometimes
> not, and I can't quite tell the two situations apart.  It's all
> very confusing to the Noob.  (I'm sure this is all documented
> *somewhere*, but this does not make using attributes any more
> intuitive or straightforward.  I'm also sure that *eventually*,
> with enough Python experience under one's belt, this all becomes
> second nature.  My point is that Python attributes are not as
> transparent and natural to the uninitiated as some of you folks
> seem to think.)

I agree that the introduction of the descriptor protocol added some more 
complexity to an already somehow unusual model object.

HTH.


From jjposner at optimum.net  Mon Mar 22 13:36:34 2010
From: jjposner at optimum.net (John Posner)
Date: Mon, 22 Mar 2010 13:36:34 -0400
Subject: How to automate accessor definition?
In-Reply-To: <4ba79040$0$22397$426a74cc@news.free.fr>
References: <ho3heq$61v$1@reader1.panix.com>
	<639908184290880449.447600deets-nospam.web.de@news.hansenet.de>
	<ho5j64$22l$1@reader1.panix.com>
	<mailman.1030.1269194878.23598.python-list@python.org>
	<ho7sqi$jq$1@reader1.panix.com>
	<4ba79040$0$22397$426a74cc@news.free.fr>
Message-ID: <4ba7aa87$0$4974$607ed4bc@cv.net>

On 3/22/2010 11:44 AM, Bruno Desthuilliers wrote:

<snip>

> Another (better IMHO) solution is to use a plain property, and store the
> computed value as an implementation attribute :
>
> @property
> def foo(self):
> cached = self.__dict__.get('_foo_cache')
> if cached is None:
> self._foo_cache = cached = self._some_time_consuming_operation()
> return cached
>

There's no need to access __dict__ directly. I believe this is 
equivalent (and clearer):

  @property
  def foo(self):
      try:
          cached = self._foo_cache
      except AttributeError:
          self._foo_cache = cached = self._time_consuming_op()
      return cached

-John


From luismgz at gmail.com  Mon Mar 22 13:59:07 2010
From: luismgz at gmail.com (=?ISO-8859-1?Q?Luis_M=2E_Gonz=E1lez?=)
Date: Mon, 22 Mar 2010 10:59:07 -0700 (PDT)
Subject: DreamPie - The Python shell you've always dreamed about!
References: <6c6a96e0-be08-4ec3-a002-0bb9232a8afd@f29g2000yqa.googlegroups.com>
	<12cd38b0-1d34-4b1e-96fb-19c3e2f62ab7@e1g2000yqh.googlegroups.com> 
	<0fe91504-cb4f-46b6-a327-c5979bb104a6@q16g2000yqq.googlegroups.com> 
	<7430987e-3603-4805-b4f4-cae73ca2d3f6@g11g2000yqe.googlegroups.com> 
	<b10235a4-586d-4c81-96f4-acaed4d61797@b2g2000yqi.googlegroups.com>
Message-ID: <15025fc0-c697-4085-81a0-160882767540@15g2000yqi.googlegroups.com>

On Feb 21, 6:40?pm, Mensanator <mensana... at aol.com> wrote:
> On Feb 21, 12:14?pm, Paul Boddie <p... at boddie.org.uk> wrote:
>
>
>
>
>
> > On 21 Feb, 17:32, Mensanator <mensana... at aol.com> wrote:
>
> > > On Feb 21, 10:30 am, Mensanator <mensana... at aol.com> wrote:
>
> > > > What versions of Python does it suuport?
>
> > > What OS are supported?
>
> > From the Web site referenced in the announcement (http://
> > dreampie.sourceforge.net/):
>
> > """
> > # Supports Python 2.5, Python 2.6, Jython 2.5, IronPython 2.6 and
> > Python 3.1.
> > # Works on Windows and Linux.
> > """
>
> Yeah, I saw that. Funny that something important like that wasn't part
> of the
> announcement. I notice no mention of Mac OS, so visiting the website
> was a complete
> waste of time on my part, wasn't it?
>
>
>
> > Paul

Geez... someone spends many hours (or days or even months) writing a
program to be offered for free to the world, and you get annoyed by
losing two seconds while checking it out?


From chambon.pascal at wanadoo.fr  Mon Mar 22 14:20:39 2010
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Mon, 22 Mar 2010 19:20:39 +0100
Subject: Castrated traceback in sys.exc_info()
In-Reply-To: <op.u9uflwxxx6zn5v@lepton.softlabbsas.com.ar>
References: <7866674b-46ba-49e2-9d76-e8259ba22df0@z3g2000yqz.googlegroups.com>	<20100317124019.7013dfa3@moriz.interne>	<9fd96c3b1003170542t4ea864c6y359107cb747536da@mail.gmail.com>
	<op.u9uflwxxx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <4BA7B4F7.6080404@wanadoo.fr>

Gabriel Genellina a ?crit :
>
> En Wed, 17 Mar 2010 09:42:06 -0300, Pascal Chambon 
> <chambon.pascal at gmail.com> escribi?:
>
>> traceback functions indeed allow the manipulation of exception 
>> tracebacks,
>> but the root problem is that anyway, since that traceback is incomplete,
>> your "traceback.format_exc().splitlines()" will only provide frames for
>> callee (downward) functions, not caller (upward) ones, starting from the
>> exception catching frame.
>
> Either I don't understand what you mean, or I can't reproduce it:
>
>

Allright, here is more concretely the problem :

<code>
import logging

def a(): return b()
def b(): return c()
def c():
    try:
        return d()
    except:
        logging.exception("An error")
   
def d(): raise ValueError

def main():
    logging.basicConfig(level=logging.DEBUG)
    a()
 
main()
</code>

OUTPUT:
 >>>
ERROR:root:An error
Traceback (most recent call last):
  File "C:/Users/Pakal/Desktop/aaa.py", line 7, in c
    return d()
  File "C:/Users/Pakal/Desktop/aaa.py", line 11, in d
    def d(): raise ValueError
ValueError
 >>>


As you see, the traceback only starts from function c, which handles the 
exception.
It doesn't show main(), a() and b(), which might however be (and are, in 
my case) critical to diagnose the severity of the problem (since many 
different paths would lead to calling c()).

So the question is : is that possible to enforce, by a way or another, 
the retrieval of the FULL traceback at exception raising point, instead 
of that incomplete one ?

Thank you for your help,
regards,

Pascal




From python at rcn.com  Mon Mar 22 14:27:57 2010
From: python at rcn.com (Raymond Hettinger)
Date: Mon, 22 Mar 2010 11:27:57 -0700 (PDT)
Subject: short-circuiting any/all ?
References: <ho7vq2$1s5$1@reader1.panix.com>
Message-ID: <defa8f1f-4932-49f0-a538-377e27b3254b@p3g2000pra.googlegroups.com>

On Mar 22, 7:45?am, kj <no.em... at please.post> wrote:
> I have a list of items L, and a test function is_invalid that checks
> the validity of each item. ?To check that there are no invalid
> items in L, I could check the value of any(map(is_invalid, L)).
> But this approach is suboptimal in the sense that, no matter what
> L is, is_invalid will be executed for all elements of L, even though
> the value returned by any() is fully determined by the first True
> in its argument. ?In other words, all calls to is_invalid after
> the first one to return True are superfluous. ?Is there a
> short-circuiting counterpart to any(map(is_invalid, L)) that avoids
> these superfluous calls?
>
> OK, there's this one, of course:
>
> def _any_invalid(L):
> ? ? for i in L:
> ? ? ? ? if is_invalid(i):
> ? ? ? ? ? ? return True
> ? ? return False ?
>
> But is there anything built-in? ?(I imagine that a lazy version of
> map *may* do the trick, *if* any() will let it be lazy.)

Yes, that will work:

      from itertools import imap  # lazy version of map
      any(imap(is_invalid, L)     # short-circuits on first True

Yet another approach (slightly faster):

   from itertools import ifilter
   any(ifilter(is_invalid, L))


Raymond





From no.email at please.post  Mon Mar 22 14:30:34 2010
From: no.email at please.post (kj)
Date: Mon, 22 Mar 2010 18:30:34 +0000 (UTC)
Subject: short-circuiting any/all ?
References: <ho7vq2$1s5$1@reader1.panix.com>
	<291d82b7-b13b-4f49-901c-8194f3e07598@e7g2000yqf.googlegroups.com>
Message-ID: <ho8d0a$261$1@reader1.panix.com>

In <291d82b7-b13b-4f49-901c-8194f3e07598 at e7g2000yqf.googlegroups.com> nn <pruebauno at latinmail.com> writes:

>If you are in Python 3 "any(map(is_invalid, L))" should short circuit.
>If you are in Python 2 use "from itertools import imap;
>any(imap(is_invalid, L))"

Thanks!  I'm glad to know that one can get the short circuiting
using a map-type idiom.  (I prefer map over comprehensions when I
don't need to define a function just for the purpose of passing it
to it.)

And thanks also to the other repliers for pointing out that the
comprehension version does what I was asking for.

~K


From mail at timgolden.me.uk  Mon Mar 22 14:43:07 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Mon, 22 Mar 2010 18:43:07 +0000
Subject: short-circuiting any/all ?
In-Reply-To: <ho8d0a$261$1@reader1.panix.com>
References: <ho7vq2$1s5$1@reader1.panix.com>	<291d82b7-b13b-4f49-901c-8194f3e07598@e7g2000yqf.googlegroups.com>
	<ho8d0a$261$1@reader1.panix.com>
Message-ID: <4BA7BA3B.2000006@timgolden.me.uk>

On 22/03/2010 18:30, kj wrote:
> Thanks!  I'm glad to know that one can get the short circuiting
> using a map-type idiom.  (I prefer map over comprehensions when I
> don't need to define a function just for the purpose of passing it
> to it.)

In what way does "map" over "comprehensions" save you defining a function?

any (map (is_invalid, L))
any (is_invalid (i) for i in L)

TJG



From krister.svanlund at gmail.com  Mon Mar 22 17:19:49 2010
From: krister.svanlund at gmail.com (Krister Svanlund)
Date: Mon, 22 Mar 2010 22:19:49 +0100
Subject: Problem with sys.path when embedding Python3 in C
Message-ID: <2cf430a61003221419t2192c9aajd3c2d2922b1d7f12@mail.gmail.com>

Hi, I've recently begun experimenting with embedding python and i got
a small problem.
This is my current testing code (basically all from python docs):

> int main(int argc, char *argv[])
>
> {
>
> PyObject *pModuleName, *pTestModule, *pTestFunc, *pTestResult, *pTestArgs;
>
> PyImport_AppendInittab("node", &PyInit_node);
>
> Py_Initialize();

The following line here is the ugly-hack I had to do to make it work,
nothing else I know of makes it possible to import modules from
startup directory. So my question is: Is there a prettier way to do
this?

> PyRun_SimpleString("import sys\nsys.path.append(\"\")");
>
> PyRun_SimpleString("import sys\nprint(sys.path)");
>
> pModuleName = PyUnicode_FromString("stuff");
>
> pTestModule = PyImport_Import(pModuleName);
>
> Py_DECREF(pModuleName);
>
> if (pTestModule != NULL)
>
> { ...

The whole code is here: http://pastebin.com/805BSY8f
You only need a file in the same directory called stuff.py containing
a function def for a function called do_stuff


From zookog at gmail.com  Mon Mar 22 17:19:49 2010
From: zookog at gmail.com (Zooko O'Whielacronx)
Date: Mon, 22 Mar 2010 15:19:49 -0600
Subject: StringChain -- a data structure for managing large sequences of 
	chunks of bytes
In-Reply-To: <cd6401a1003212209l175f26c8t4a8d924a6f823972@mail.gmail.com>
References: <mailman.646.1268377905.23598.python-list@python.org>
	<4b9a00ce$0$27822$c3e8da3@news.astraweb.com>
	<cd6401a1003212209l175f26c8t4a8d924a6f823972@mail.gmail.com>
Message-ID: <cd6401a1003221419r3fe4176cv5040e8cba2b5b4aa@mail.gmail.com>

My apologies; I left out the heading on the last of the four
structures in the benchmark results. Here are those results again with
the missing heading (Stringy) inserted:

Regards,

Zooko
- Hide quoted text -

On Sun, Mar 21, 2010 at 11:09 PM, Zooko O'Whielacronx <zookog at gmail.com> wrote:
>
> impl:  StringChain
> task:  _accumulate_then_one_gulp
>  10000 best: 2.694e+00
>  50000 best: 2.742e+00
>  100000 best: 2.310e+00
>  500000 best: 2.040e+00
> 1000000 best: 1.988e+00
> 5000000 best: 2.193e+00
>
> task:  _alternate_str
>  10000 best: 6.509e+00
>  50000 best: 4.559e+00
>  100000 best: 4.308e+00
>  500000 best: 4.070e+00
> 1000000 best: 3.991e+00
> 5000000 best: 4.000e+00
>
> impl:  SimplerStringChain
> task:  _accumulate_then_one_gulp
>  10000 best: 1.407e+00
>  50000 best: 2.317e+00
>  100000 best: 2.012e+00
>  500000 best: 1.902e+00
> 1000000 best: 1.897e+00
> 5000000 best: 2.104e+00
>
> task:  _alternate_str
>  10000 best: 4.888e+00
>  50000 best: 5.198e+00
>  100000 best: 1.750e+01
>  500000 best: 6.233e+01
> 1000000 best: 1.134e+02
> 5000000 best: 7.599e+02
>
> impl:  StringIOy
> task:  _accumulate_then_one_gulp
>  10000 best: 4.196e+00
>  50000 best: 5.522e+00
>  100000 best: 4.499e+00
>  500000 best: 3.756e+00
> 1000000 best: 4.176e+00
> 5000000 best: 5.414e+00
>
> task:  _alternate_str
>  10000 best: 5.484e+00
>  50000 best: 7.863e+00
>  100000 best: 2.126e+01
>  500000 best: 6.972e+01
> 1000000 best: 1.219e+02
> 5000000 best: 9.463e+02
>
impl:  Stringy
- Hide quoted text -
> task:  _accumulate_then_one_gulp
>  10000 best: 1.502e+00
>  50000 best: 1.420e+01
>  100000 best: 2.245e+01
>  500000 best: 8.577e+01
> 1000000 best: 2.295e+02
> 5000000 best: 1.326e+03
>
> task:  _alternate_str
>  10000 best: 3.290e+00
>  50000 best: 4.220e+00
>  100000 best: 1.665e+01
>  500000 best: 6.281e+01
> 1000000 best: 1.127e+02
> 5000000 best: 7.626e+02
>


From zookog at gmail.com  Mon Mar 22 17:21:53 2010
From: zookog at gmail.com (Zooko O'Whielacronx)
Date: Mon, 22 Mar 2010 15:21:53 -0600
Subject: StringChain -- a data structure for managing large sequences of 
	chunks of bytes
In-Reply-To: <pan.2010.03.22.08.07.48@REMOVE.THIS.cybersource.com.au>
References: <mailman.646.1268377905.23598.python-list@python.org>
	<4b9a00ce$0$27822$c3e8da3@news.astraweb.com>
	<mailman.1055.1269234593.23598.python-list@python.org>
	<pan.2010.03.22.08.07.48@REMOVE.THIS.cybersource.com.au>
Message-ID: <cd6401a1003221421w33b0079ay4811f4e23618b90b@mail.gmail.com>

On Mon, Mar 22, 2010 at 2:07 AM, Steven D'Aprano
<steven at remove.this.cybersource.com.au> wrote:
>
> Perhaps you should have said that it was a wrapper around deque giving
> richer functionality, rather than giving the impression that it was a
> brand new data structure invented by you. People are naturally going to
> be more skeptical about a newly invented data structure than one based on
> a reliable, component like deque.

The fact that StringChain uses deque to hold the queue of strings
isn't that important. I just benchmarked it by swapping in the deque
for a list and using the list costs about one third of a nanosecond
per byte at the scales that the benchmark exercises (namely 10,000,000
bytes in about 10,000 strings). A third of a nanosecond per byte is
about 4% of the runtime.

I also implemented and benchmarked a simpler deque-based scheme which
puts all the actual bytes from the strings into a deque with
self.d.extend(newstr). As you would expect, this shows good asymptotic
performance but the constants are relatively bad so that at all of the
actual loads measured it was three orders of magnitude worse than
StringChain and than String-Chain-with-a-list-instead-of-a-deque.
Moral: the constants matter!

Those benchmarks are appended. You can run the benchmarks yourself per
the README.txt.

But anyway, I take your point and I updated the StringChain README to
explain that it is a pretty simple data structure that holds a list
(actually a deque) of strings and isn't anything too clever or novel.

By the way, we could further micro-optimize this kind of thing if
''.join() would accept either strings or buffers instead of requiring
strings:

>>> ''.join([buffer("abc"), "def"])
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: sequence item 0: expected string, buffer found

Then whenever StringChain needs to slice a string into leading and
trailing parts, it could construct a buffer() viewing each part
instead of making a copy of each part.


> it. Maybe you should consider linking to it on PyPI and seeing if there
> is any interest from others?

http://pypi.python.org/pypi/stringchain

Regards,

Zooko

impl:  StringChain
task:  _accumulate_then_one_gulp
  10000 best: 5.698e+00,   3th-best: 7.486e+00, mean: 7.758e+00,
 100000 best: 4.640e+00,   3th-best: 4.690e+00, mean: 7.674e+00,
 1000000 best: 3.789e+00,   3th-best: 3.806e+00, mean: 3.995e+00,
10000000 best: 4.095e+00,   1th-best: 4.095e+00, mean: 4.095e+00,
task:  _alternate_str
  10000 best: 1.378e+01,   3th-best: 1.390e+01, mean: 1.500e+01,
 100000 best: 9.198e+00,   3th-best: 9.248e+00, mean: 9.385e+00,
 1000000 best: 8.715e+00,   3th-best: 8.755e+00, mean: 8.808e+00,
10000000 best: 8.738e+00,   1th-best: 8.738e+00, mean: 8.738e+00,
impl:  StringChainWithList
task:  _accumulate_then_one_gulp
  10000 best: 3.600e+00,   3th-best: 3.695e+00, mean: 4.129e+00,
 100000 best: 4.070e+00,   3th-best: 4.079e+00, mean: 4.162e+00,
 1000000 best: 3.662e+00,   3th-best: 3.688e+00, mean: 3.721e+00,
10000000 best: 3.902e+00,   1th-best: 3.902e+00, mean: 3.902e+00,
1th-worst: 3.902e+00, worst: 3.902e+00 (of      1)
task:  _alternate_str
  10000 best: 1.369e+01,   3th-best: 1.380e+01, mean: 1.442e+01,
 100000 best: 9.251e+00,   3th-best: 9.289e+00, mean: 9.416e+00,
 1000000 best: 8.809e+00,   3th-best: 8.876e+00, mean: 8.943e+00,
10000000 best: 9.095e+00,   1th-best: 9.095e+00, mean: 9.095e+00,
impl:  Dequey
task:  _accumulate_then_one_gulp
  10000 best: 2.772e+02,   3th-best: 2.785e+02, mean: 2.911e+02,
 100000 best: 2.314e+02,   3th-best: 2.334e+02, mean: 2.422e+02,
 1000000 best: 2.282e+02,   3th-best: 2.288e+02, mean: 2.370e+02,
10000000 best: 2.587e+02,   1th-best: 2.587e+02, mean: 2.587e+02,
task:  _alternate_str
  10000 best: 1.576e+03,   3th-best: 1.580e+03, mean: 1.608e+03,
 100000 best: 1.301e+03,   3th-best: 1.303e+03, mean: 1.306e+03,
 1000000 best: 1.275e+03,   3th-best: 1.276e+03, mean: 1.278e+03,
10000000 best: 1.280e+03,   1th-best: 1.280e+03, mean: 1.280e+03,


From no.email at please.post  Mon Mar 22 18:16:09 2010
From: no.email at please.post (kj)
Date: Mon, 22 Mar 2010 22:16:09 +0000 (UTC)
Subject: How to automate accessor definition?
References: <ho3heq$61v$1@reader1.panix.com>
	<639908184290880449.447600deets-nospam.web.de@news.hansenet.de>
	<ho5j64$22l$1@reader1.panix.com>
	<mailman.1030.1269194878.23598.python-list@python.org>
	<ho7sqi$jq$1@reader1.panix.com>
	<4ba79040$0$22397$426a74cc@news.free.fr>
Message-ID: <ho8q79$8jp$1@reader1.panix.com>

In <4ba79040$0$22397$426a74cc at news.free.fr> Bruno Desthuilliers <bruno.42.desthuilliers at websiteburo.invalid> writes:

>kj a ?crit :
>> PS: BTW, this is not the first time that attempting to set an
>> attribute (in a class written by me even) blows up on me.  It's
>> situations like these that rattle my grasp of attributes, hence my
>> original question about boring, plodding, verbose Java-oid accessors.
>> For me these Python attributes are still waaay too mysterious and
>> unpredictable to rely on.

>Somehow simplified, here's what you have to know:

...

>As I said, this is a somehow simplified description of the process - I 
>skipped the parts about __slots__, __getattribute__ and __setattr__, as 
>well as the part about how function class attributes become methods.
>this should be enough to get an idea of what's going on.


Thank you, sir!  That was quite the education.

(Someday I really should read carefully the official documentation
for the stuff you described, assuming it exists.)

Thanks also for your code suggestions.

~K


From no.email at please.post  Mon Mar 22 18:19:57 2010
From: no.email at please.post (kj)
Date: Mon, 22 Mar 2010 22:19:57 +0000 (UTC)
Subject: short-circuiting any/all ?
References: <ho7vq2$1s5$1@reader1.panix.com>	<291d82b7-b13b-4f49-901c-8194f3e07598@e7g2000yqf.googlegroups.com>
	<ho8d0a$261$1@reader1.panix.com>
	<mailman.1069.1269283393.23598.python-list@python.org>
Message-ID: <ho8qed$ap0$1@reader1.panix.com>

In <mailman.1069.1269283393.23598.python-list at python.org> Tim Golden <mail at timgolden.me.uk> writes:

>On 22/03/2010 18:30, kj wrote:
>> Thanks!  I'm glad to know that one can get the short circuiting
>> using a map-type idiom.  (I prefer map over comprehensions when I
>> don't need to define a function just for the purpose of passing it
>> to it.)

>In what way does "map" over "comprehensions" save you defining a function?

>any (map (is_invalid, L))
>any (is_invalid (i) for i in L)

I was talking in the *general* case.  map at the very least requires
a lambda expression, which is a one-time function defintion.

~K


From steve at holdenweb.com  Mon Mar 22 19:17:00 2010
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 22 Mar 2010 19:17:00 -0400
Subject: DreamPie - The Python shell you've always dreamed about!
In-Reply-To: <15025fc0-c697-4085-81a0-160882767540@15g2000yqi.googlegroups.com>
References: <6c6a96e0-be08-4ec3-a002-0bb9232a8afd@f29g2000yqa.googlegroups.com>	<12cd38b0-1d34-4b1e-96fb-19c3e2f62ab7@e1g2000yqh.googlegroups.com>
	<0fe91504-cb4f-46b6-a327-c5979bb104a6@q16g2000yqq.googlegroups.com>
	<7430987e-3603-4805-b4f4-cae73ca2d3f6@g11g2000yqe.googlegroups.com>
	<b10235a4-586d-4c81-96f4-acaed4d61797@b2g2000yqi.googlegroups.com>
	<15025fc0-c697-4085-81a0-160882767540@15g2000yqi.googlegroups.com>
Message-ID: <ho8tpe$kpg$1@dough.gmane.org>

Luis M. Gonz?lez wrote:
> On Feb 21, 6:40 pm, Mensanator <mensana... at aol.com> wrote:
>> On Feb 21, 12:14 pm, Paul Boddie <p... at boddie.org.uk> wrote:
>>
>>
>>
>>
>>
>>> On 21 Feb, 17:32, Mensanator <mensana... at aol.com> wrote:
>>>> On Feb 21, 10:30 am, Mensanator <mensana... at aol.com> wrote:
>>>>> What versions of Python does it suuport?
>>>> What OS are supported?
>>> From the Web site referenced in the announcement (http://
>>> dreampie.sourceforge.net/):
>>> """
>>> # Supports Python 2.5, Python 2.6, Jython 2.5, IronPython 2.6 and
>>> Python 3.1.
>>> # Works on Windows and Linux.
>>> """
>> Yeah, I saw that. Funny that something important like that wasn't part
>> of the
>> announcement. I notice no mention of Mac OS, so visiting the website
>> was a complete
>> waste of time on my part, wasn't it?
>>
>>
>>
>>> Paul
> 
> Geez... someone spends many hours (or days or even months) writing a
> program to be offered for free to the world, and you get annoyed by
> losing two seconds while checking it out?

And if it's open source there's always the possibility of doing a Mac
port and contributing the code back.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
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From tan at nowhere.land  Mon Mar 22 19:40:16 2010
From: tan at nowhere.land (tan)
Date: Mon, 22 Mar 2010 23:40:16 GMT
Subject: GC is very expensive: am I doing something wrong?
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
	<mailman.963.1268958842.23598.python-list@python.org>
	<ho6ai4$b12$2@lust.ihug.co.nz>
	<mailman.1060.1269243742.23598.python-list@python.org>
Message-ID: <ho8v4q$a4q$2@news.eternal-september.org>

In article <mailman.1060.1269243742.23598.python-list at python.org>, Stefan Behnel <stefan_ml at behnel.de> wrote:
>Lawrence D'Oliveiro, 22.03.2010 00:36:
>> Terry Reedy wrote:
>>> No one has discovered a setting
>>> of the internal tuning parameters for which there are no bad patterns
>>> and I suspect there are not any such. This does not negate Xavier's
>>> suggestion that a code change might also solve your problem.
>>
>> Could it be that for implementing a structure like a trie as the OP is,
>> where a lot of CPU cycles can be spent manipulating the structure, a high-
>> level language like Python, Perl or Ruby just gets in the way?
>
>I would rather say that the specific problem of the trie data structure is 
>that it has extremely little benefit over other available data structures.

Not true.
 
>There may still be a couple of niches where it makes sense to consider it 
>as an alternative, but given that dicts are so heavily optimised in Python, 
>it'll be hard for tries to compete even when written in a low-level language.

It depends. If your data is not in nearly sorted order,
trees are some of the best mechanisms available.

>Remember that the original use case was to load a dictionary from a text 
>file. For this use case, a trie can be very wasteful in terms of memory and 
>rather CPU cache unfriendly on traversal, whereas hash values are a) rather 
>fast to calculate for a string, and b) often just calculated once and then 
>kept alive in the string object for later reuse.

You still have to walk the bucket in a hash map/table.
Performance may be orders of magnitude worse than for trees.

>> My feeling would be, try to get the language to do as much of the work for
>> you as possible. If you can???t do that, then you might be better off with a
>> lower-level language.
>
>I agree with the first sentence, but I'd like to underline the word 'might' 
>in the second. As this newsgroup shows, very often it's enough to look for 
>a better algorithmic approach first.
>
>Stefan
>

--
You want to know who you are?

http://oshosearch.net/Convert/search.php

Most Osho books on line:

http://oshosearch.net



From vlastimil.brom at gmail.com  Mon Mar 22 20:19:04 2010
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Tue, 23 Mar 2010 01:19:04 +0100
Subject: individually updating unicodedata db?
Message-ID: <9fdb569a1003221719k50345867vfc4a47683e877aae@mail.gmail.com>

Hi all,
I just tried to find some information about the unicodedata database
and the possibilities of updating it to the latest version of the
unicode standards (currently 5.2, while python supports 5.1 in the
latest versions).
An option to update this database individually might be useful as the
unicode standard updates seem to be more frequent than the official
python releases (and not every release is updated to the latest
available unicode db version either).
Am I right, that this is not possible without recompiling python from source?
I eventually found the promissing file
...Python-src--2.6.5\Python-2.6.5\Tools\unicode\makeunicodedata.py
which required the following files from the unicode database to be in
the same folder:
EastAsianWidth-3.2.0.txt
UnicodeData-3.2.0.txt
CompositionExclusions-3.2.0.txt
UnicodeData.txt
EastAsianWidth.txt
CompositionExclusions.txt

and also
Modules/unicodedata_db.h
Modules/unicodename_db.h,
Objects/unicodetype_db.h

After a minor correction - addig the missing "import re" - the script
was able to run and recreate the above h files.
I guess, I am stuck here, as I use the precompiled version supplied in
the windows installer and can't compile python from source to obtain
the needed unicodedata.pyd.
Or are there any possibilities I missed to individually upgrade the
unicodedata databese? (Using Python 2.6.5, Win XPh SP3)

Thanks in advance for any hints,
   vbr


From hawat.thufir at gmail.com  Mon Mar 22 20:23:27 2010
From: hawat.thufir at gmail.com (Thufir)
Date: Mon, 22 Mar 2010 17:23:27 -0700 (PDT)
Subject: google token
References: <uo0pn.52098$2r7.8254@newsfe05.iad>
	<4ba49f98$0$27838$c3e8da3@news.astraweb.com>
Message-ID: <4f5d2017-8d64-4d4c-b013-b49b4c199005@v20g2000prc.googlegroups.com>

On Mar 20, 3:12 am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Sat, 20 Mar 2010 09:17:14 +0000, Thufir wrote:
> > I'd like to acquire a token, as below, but from Java:
>
> Perhaps you should be asking a Java discussion group? This group is for
> discussing Python.
>
> --
> Steven


What I meant to ask is, how is that token being acquired?  Is that
just a GET?



thanks,

Thufir


From python at mrabarnett.plus.com  Mon Mar 22 21:27:28 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 23 Mar 2010 01:27:28 +0000
Subject: individually updating unicodedata db?
In-Reply-To: <9fdb569a1003221719k50345867vfc4a47683e877aae@mail.gmail.com>
References: <9fdb569a1003221719k50345867vfc4a47683e877aae@mail.gmail.com>
Message-ID: <4BA81900.6000505@mrabarnett.plus.com>

Vlastimil Brom wrote:
> Hi all,
> I just tried to find some information about the unicodedata database
> and the possibilities of updating it to the latest version of the
> unicode standards (currently 5.2, while python supports 5.1 in the
> latest versions).
> An option to update this database individually might be useful as the
> unicode standard updates seem to be more frequent than the official
> python releases (and not every release is updated to the latest
> available unicode db version either).
> Am I right, that this is not possible without recompiling python from source?
> I eventually found the promissing file
> ...Python-src--2.6.5\Python-2.6.5\Tools\unicode\makeunicodedata.py
> which required the following files from the unicode database to be in
> the same folder:
> EastAsianWidth-3.2.0.txt
> UnicodeData-3.2.0.txt
> CompositionExclusions-3.2.0.txt
> UnicodeData.txt
> EastAsianWidth.txt
> CompositionExclusions.txt
> 
> and also
> Modules/unicodedata_db.h
> Modules/unicodename_db.h,
> Objects/unicodetype_db.h
> 
> After a minor correction - addig the missing "import re" - the script
> was able to run and recreate the above h files.
> I guess, I am stuck here, as I use the precompiled version supplied in
> the windows installer and can't compile python from source to obtain
> the needed unicodedata.pyd.
> Or are there any possibilities I missed to individually upgrade the
> unicodedata databese? (Using Python 2.6.5, Win XPh SP3)
> 
> Thanks in advance for any hints,
>    vbr

 From the look of it the Unicode data is compiled into the DLL, but I
don't see any reason, other than speed, why preprocessed data couldn't
be read from a file at startup by the DLL, provided that the format 
hasn't changed, eg new fields added, without affecting the DLL's
interface to the rest of Python.


From steven at REMOVE.THIS.cybersource.com.au  Mon Mar 22 21:30:37 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 23 Mar 2010 01:30:37 GMT
Subject: short-circuiting any/all ?
References: <ho7vq2$1s5$1@reader1.panix.com>
	<291d82b7-b13b-4f49-901c-8194f3e07598@e7g2000yqf.googlegroups.com>
	<ho8d0a$261$1@reader1.panix.com>
	<mailman.1069.1269283393.23598.python-list@python.org>
	<ho8qed$ap0$1@reader1.panix.com>
Message-ID: <pan.2010.03.23.01.30.37@REMOVE.THIS.cybersource.com.au>

On Mon, 22 Mar 2010 22:19:57 +0000, kj wrote:

> In <mailman.1069.1269283393.23598.python-list at python.org> Tim Golden
> <mail at timgolden.me.uk> writes:
> 
>>On 22/03/2010 18:30, kj wrote:
>>> Thanks!  I'm glad to know that one can get the short circuiting using
>>> a map-type idiom.  (I prefer map over comprehensions when I don't need
>>> to define a function just for the purpose of passing it to it.)
> 
>>In what way does "map" over "comprehensions" save you defining a
>>function?
> 
>>any (map (is_invalid, L))
>>any (is_invalid (i) for i in L)
> 
> I was talking in the *general* case.  map at the very least requires a
> lambda expression, which is a one-time function defintion.

But keep in mind that instead of this:


map(lambda x,y: x+y, somelist)

you can do this:

import operator
map(operator.add, somelist)


In any case, the once-off cost of creating or importing a function is 
usually quite cheap. As usual, the best advise is not to worry about 
optimization until you have profiled the code and learned where the 
actual bottlenecks are. Write what reads best, not what you guess might 
be faster, until you really know you need the speed and that it is an 
optimization and not a pessimation.



-- 
Steven


From solipsis at pitrou.net  Mon Mar 22 22:11:57 2010
From: solipsis at pitrou.net (Antoine Pitrou)
Date: Tue, 23 Mar 2010 02:11:57 +0000 (UTC)
Subject: GC is very expensive: am I doing something wrong?
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
	<mailman.963.1268958842.23598.python-list@python.org>
	<ho6ai4$b12$2@lust.ihug.co.nz>
	<mailman.1060.1269243742.23598.python-list@python.org>
	<ho8v4q$a4q$2@news.eternal-september.org>
Message-ID: <ho981d$ehv$1@dough.gmane.org>

Le Mon, 22 Mar 2010 23:40:16 +0000, tan a ?crit?:
> 
>>Remember that the original use case was to load a dictionary from a text
>>file. For this use case, a trie can be very wasteful in terms of memory
>>and rather CPU cache unfriendly on traversal, whereas hash values are a)
>>rather fast to calculate for a string, and b) often just calculated once
>>and then kept alive in the string object for later reuse.
> 
> You still have to walk the bucket in a hash map/table. Performance may
> be orders of magnitude worse than for trees.

"walk the bucket" shouldn't be a significant cost factor here, especially 
if you are doing meaningful work with the traversed items. In the CPython 
implementation the total hash table size is less than a constant times 
the number of actual items. Moreover, it's a linear scan over an array 
rather than having to dereference pointers as in tree.

"Orders of magnitude worse", in any case, sounds very exaggerated.

(and, of course, as the OP said, there's the major difference that the 
dict type is implemented in C, which makes constant factors an order of 
magnitude smaller than for a Python trie implementation)



From no.email at please.post  Mon Mar 22 22:26:20 2010
From: no.email at please.post (kj)
Date: Tue, 23 Mar 2010 02:26:20 +0000 (UTC)
Subject: short-circuiting any/all ?
References: <ho7vq2$1s5$1@reader1.panix.com>
	<291d82b7-b13b-4f49-901c-8194f3e07598@e7g2000yqf.googlegroups.com>
	<ho8d0a$261$1@reader1.panix.com>
	<mailman.1069.1269283393.23598.python-list@python.org>
	<ho8qed$ap0$1@reader1.panix.com>
	<pan.2010.03.23.01.30.37@REMOVE.THIS.cybersource.com.au>
Message-ID: <ho98sc$abv$1@reader1.panix.com>

In <pan.2010.03.23.01.30.37 at REMOVE.THIS.cybersource.com.au> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:

>On Mon, 22 Mar 2010 22:19:57 +0000, kj wrote:

>In any case, the once-off cost of creating or importing a function is 
>usually quite cheap. As usual, the best advise is not to worry about 
>optimization until you have profiled the code and learned where the 
>actual bottlenecks are. Write what reads best, not what you guess might 
>be faster, until you really know you need the speed and that it is an 
>optimization and not a pessimation.


My preference for map in this case is not due to performance
considerations, but to avoid unnecessary code-clutter.  I just
find, e.g.,

  x = map(int, y)

slightly easier on the eyes than

  x = [int(z) for z in y]

This tiny improvement in readability gets negated if one needs to
define a function in order to use map.  Hence, e.g., I prefer

  x = [_[0] for _ in y]

over

  x = map(lambda _: _[0], y)

and certainly over

  def _first(seq):
     return seq[0]
  x = map(_first, y)

Arguably, Knuth's "premature optimization is the root of all evil"
applies even to readability (e.g. "what's the point of making code
optimally readable if one is going to change it completely next
day?")  If there were the equivalent of a profiler for code clutter,
I guess I could relax my readability standards a bit...

~K


From rami.chowdhury at gmail.com  Mon Mar 22 22:59:18 2010
From: rami.chowdhury at gmail.com (Rami Chowdhury)
Date: Mon, 22 Mar 2010 19:59:18 -0700
Subject: google token
In-Reply-To: <4f5d2017-8d64-4d4c-b013-b49b4c199005@v20g2000prc.googlegroups.com>
References: <uo0pn.52098$2r7.8254@newsfe05.iad>
	<4ba49f98$0$27838$c3e8da3@news.astraweb.com>
	<4f5d2017-8d64-4d4c-b013-b49b4c199005@v20g2000prc.googlegroups.com>
Message-ID: <201003221959.19307.rami.chowdhury@gmail.com>

On Monday 22 March 2010 17:23:27 Thufir wrote:
> On Mar 20, 3:12 am, Steven D'Aprano <st... at REMOVE-THIS-
> 
> cybersource.com.au> wrote:
> > On Sat, 20 Mar 2010 09:17:14 +0000, Thufir wrote:
> > > I'd like to acquire a token, as below, but from Java:
> > Perhaps you should be asking a Java discussion group? This group is for
> > discussing Python.
> > 
> > --
> > Steven
> 
> What I meant to ask is, how is that token being acquired?  Is that
> just a GET?
> 

Looks like it -- a urllib2 request, anyway -- the self._web object is defined 
here: http://pyrfeed.googlecode.com/svn/trunk/lib/web/web.py

> 
> 
> thanks,
> 
> Thufir

----
Rami Chowdhury
"Any sufficiently advanced incompetence is indistinguishable from malice." -- 
Grey's Law
408-597-7068 (US) / 07875-841-046 (UK) / 01819-245544 (BD)


From timr at probo.com  Tue Mar 23 00:22:28 2010
From: timr at probo.com (Tim Roberts)
Date: Mon, 22 Mar 2010 21:22:28 -0700
Subject: device identification
References: <9c7ed2c8-f04b-4302-a4be-bde1628ef966@y11g2000prf.googlegroups.com>
Message-ID: <46ggq59e49qpna7f9ae6q8ftobhot351un@4ax.com>

Omer Ihsan <omrihsan at gmail.com> wrote:
>
>i have installed pyusb now and run the sample usbenum.py....i have 3
>usb ports on my PC but the results show 6 outputs to
>dev.filename..they are numbers like 001 or 005 etc.... and they
>changed when i plugged in devices...(i am no good with the usb
>standards)....i just want to identify each device/port... what
>parameter in the example would help me....

You can't identify the ports.[1]  What good would it do you?  The ports on
your PC are not numbered.

You certainly CAN identify the devices, by their VID and PID (or idVendor
and idProduct).  You identify by function, not by location.  When you plug
in a USB drive, you don't want to worry about where it's plugged in.
===
[1]: OK, technically, it is not impossible to identify the port numbers,
but it is quite tedious.  You need to chase through the sysfs expansion of
your buses hub/port tree and find a match for your device.  It's not worth
the trouble.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From no.email at nospam.invalid  Tue Mar 23 01:05:40 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Mon, 22 Mar 2010 22:05:40 -0700
Subject: GC is very expensive: am I doing something wrong?
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
	<mailman.963.1268958842.23598.python-list@python.org>
	<ho6ai4$b12$2@lust.ihug.co.nz>
	<mailman.1060.1269243742.23598.python-list@python.org>
	<ho8v4q$a4q$2@news.eternal-september.org>
	<mailman.1076.1269310331.23598.python-list@python.org>
Message-ID: <7xwrx3mxuj.fsf@ruckus.brouhaha.com>

Antoine Pitrou <solipsis at pitrou.net> writes:
> "Orders of magnitude worse", in any case, sounds very exaggerated.

The worst case can lose orders of magnitude if a lot of values hash
to the same bucket.


From gagsl-py2 at yahoo.com.ar  Tue Mar 23 02:12:54 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 23 Mar 2010 03:12:54 -0300
Subject: Castrated traceback in sys.exc_info()
References: <7866674b-46ba-49e2-9d76-e8259ba22df0@z3g2000yqz.googlegroups.com>
	<20100317124019.7013dfa3@moriz.interne>
	<9fd96c3b1003170542t4ea864c6y359107cb747536da@mail.gmail.com>
	<op.u9uflwxxx6zn5v@lepton.softlabbsas.com.ar>
	<4BA7B4F7.6080404@wanadoo.fr>
Message-ID: <op.u90bjsorx6zn5v@lepton.softlabbsas.com.ar>

En Mon, 22 Mar 2010 15:20:39 -0300, Pascal Chambon  
<chambon.pascal at wanadoo.fr> escribi?:
>
> Allright, here is more concretely the problem :
>
> ERROR:root:An error
> Traceback (most recent call last):
>   File "C:/Users/Pakal/Desktop/aaa.py", line 7, in c
>     return d()
>   File "C:/Users/Pakal/Desktop/aaa.py", line 11, in d
>     def d(): raise ValueError
> ValueError
>  >>>
>
> As you see, the traceback only starts from function c, which handles the  
> exception.
> It doesn't show main(), a() and b(), which might however be (and are, in  
> my case) critical to diagnose the severity of the problem (since many  
> different paths would lead to calling c()).
>
> So the question is : is that possible to enforce, by a way or another,  
> the retrieval of the FULL traceback at exception raising point, instead  
> of that incomplete one ?

Thanks for bringing this topic! I learned a lot trying to understand what  
happens.

The exception traceback (what sys.exc_info()[2] returns) is *not* a  
complete stack trace. The sys module documentation is wrong [1] when it  
says "...encapsulates the call stack at the point where the exception  
originally occurred."

The Language Reference is more clear [2]: "Traceback objects represent a  
stack trace of an exception. A traceback object is created when an  
exception occurs. When the search for an exception handler unwinds the  
execution stack, at each unwound level a traceback object is inserted in  
front of the current traceback. When an exception handler is entered, the  
stack trace is made available to the program."

That is, a traceback holds only the *forward* part of the stack: the  
frames already exited when looking for an exception handler. Frames going  
 from the program starting point up to the current execution point are  
*not* included.

Conceptually, it's like having two lists: stack and traceback. The  
complete stack trace is always stack+traceback. At each step (when  
unwinding the stack, looking for a frame able to handle the current  
exception) an item is popped from the top of the stack (last item) and  
inserted at the head of the traceback.

The traceback holds the "forward" path (from the current execution point,  
to the frame where the exception was actually raised). It's a linked list,  
its tb_next attribute holds a reference to the next item; None marks the  
last one.

The "back" path (going from the current execution point to its caller and  
all the way to the program entry point) is a linked list of frames; the  
f_back attribute points to the previous one, or None.

In order to show a complete stack trace, one should combine both. The  
traceback module contains several useful functions: extract_stack() +  
extract_tb() are a starting point. The simplest way I could find to make  
the logging module report a complete stack is to monkey patch  
logging.Formatter.formatException so it uses format_exception() and  
format_stack() combined (in fact it is simpler than the current  
implementation using a StringIO object):

<code>
import logging
import traceback

def formatException(self, ei):
     """
     Format and return the specified exception information as a string.

     This implementation builds the complete stack trace, combining
     traceback.format_exception and traceback.format_stack.
     """
     lines = traceback.format_exception(*ei)
     if ei[2]:
         lines[1:1] = traceback.format_stack(ei[2].tb_frame.f_back)
     return ''.join(lines)

# monkey patch the logging module
logging.Formatter.formatException = formatException

def a(): return b()
def b(): return c()
def c():
     try:
       return d()
     except:
       logging.exception("An error")
       raise
def d(): raise ValueError

def main():
   a()

main()
</code>

Output:

ERROR:root:An error
Traceback (most recent call last):
   File "test_logging.py", line 32, in <module>
     main()
   File "test_logging.py", line 30, in main
     a()
   File "test_logging.py", line 19, in a
     def a(): return b()
   File "test_logging.py", line 20, in b
     def b(): return c()
   File "test_logging.py", line 23, in c
     return d()
   File "test_logging.py", line 27, in d
     def d(): raise ValueError
ValueError

Traceback (most recent call last):
   File "test_logging.py", line 32, in <module>
     main()
   File "test_logging.py", line 30, in main
     a()
   File "test_logging.py", line 19, in a
     def a(): return b()
   File "test_logging.py", line 20, in b
     def b(): return c()
   File "test_logging.py", line 23, in c
     return d()
   File "test_logging.py", line 27, in d
     def d(): raise ValueError
ValueError

Note that both tracebacks are identical: the first comes from the patched  
logging module, the second is the standard Python one.

[1] http://docs.python.org/library/sys.html#sys.exc_info
[2]  
http://docs.python.org/reference/datamodel.html#the-standard-type-hierarchy

-- 
Gabriel Genellina



From steven at REMOVE.THIS.cybersource.com.au  Tue Mar 23 02:32:13 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 23 Mar 2010 06:32:13 GMT
Subject: GC is very expensive: am I doing something wrong?
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
	<mailman.963.1268958842.23598.python-list@python.org>
	<ho6ai4$b12$2@lust.ihug.co.nz>
	<mailman.1060.1269243742.23598.python-list@python.org>
	<ho8v4q$a4q$2@news.eternal-september.org>
	<mailman.1076.1269310331.23598.python-list@python.org>
	<7xwrx3mxuj.fsf@ruckus.brouhaha.com>
Message-ID: <pan.2010.03.23.06.32.14@REMOVE.THIS.cybersource.com.au>

On Mon, 22 Mar 2010 22:05:40 -0700, Paul Rubin wrote:

> Antoine Pitrou <solipsis at pitrou.net> writes:
>> "Orders of magnitude worse", in any case, sounds very exaggerated.
> 
> The worst case can lose orders of magnitude if a lot of values hash to
> the same bucket.


Well, perhaps one order of magnitude.


>>> for i in xrange(100):
...     n = 32*i+1
...     assert hash(2**n) == hash(2)
...
>>> d1 = dict.fromkeys(xrange(100))
>>> d2 = dict.fromkeys([2**(32*i+1) for i in xrange(100)])
>>>
>>> from timeit import Timer
>>> setup = "from __main__ import d1, d2"
>>> t1 = Timer("for k in d1.keys(): x = d1[k]", setup)
>>> t2 = Timer("for k in d2.keys(): x = d2[k]", setup)
>>>
>>> min(t1.repeat(number=1000, repeat=5))
0.026707887649536133
>>> min(t2.repeat(number=1000, repeat=5))
0.33103203773498535




-- 
Steven


From gagsl-py2 at yahoo.com.ar  Tue Mar 23 03:07:47 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 23 Mar 2010 04:07:47 -0300
Subject: Problem with sys.path when embedding Python3 in C
References: <2cf430a61003221419t2192c9aajd3c2d2922b1d7f12@mail.gmail.com>
Message-ID: <op.u90d29ajx6zn5v@lepton.softlabbsas.com.ar>

En Mon, 22 Mar 2010 18:19:49 -0300, Krister Svanlund  
<krister.svanlund at gmail.com> escribi?:

> Hi, I've recently begun experimenting with embedding python and i got
> a small problem.
>
> The following line here is the ugly-hack I had to do to make it work,
> nothing else I know of makes it possible to import modules from
> startup directory. So my question is: Is there a prettier way to do
> this?

The startup directory is not included in the module search path - neither  
in your embedded version, nor in the standard interpreter (it's only  
included when running in interactive mode).

>> PyRun_SimpleString("import sys\nsys.path.append(\"\")");

If you really want the current directory in sys.path, use the getcwd  
function to obtain it. But make sure this is what you want - the directory  
containing the executable might be a better choice (at least more  
predictable).
Note that Python already provides lots of ways to add directories to  
sys.path (the default search path (see site.py), per-user site directories  
(see PEP370), .pth files, the PYTHONPATH and PYTHONHOME environment  
variables, the Windows registry, other ways I forgot...) So I'd ask why do  
you want to add a non-standard one.

In C code, you can alter the initial search path by setting   
Py_SetProgramName and Py_SetPythonHome. And you may even completely  
replace getpathp.c source file with your own.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Tue Mar 23 03:22:59 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 23 Mar 2010 04:22:59 -0300
Subject: individually updating unicodedata db?
References: <9fdb569a1003221719k50345867vfc4a47683e877aae@mail.gmail.com>
Message-ID: <op.u90eslyux6zn5v@lepton.softlabbsas.com.ar>

En Mon, 22 Mar 2010 21:19:04 -0300, Vlastimil Brom  
<vlastimil.brom at gmail.com> escribi?:

> I guess, I am stuck here, as I use the precompiled version supplied in
> the windows installer and can't compile python from source to obtain
> the needed unicodedata.pyd.

You can recompile Python from source, on Windows, using the free  
Microsoft? Visual C++? 2008 Express Edition.
http://www.microsoft.com/express/Windows/

Fetch the required dependencies using Tools\buildbot\external.bat, and  
then execute PCbuild\env.bat and build.bat. See readme.txt in that  
directory for details. It should build cleanly.

-- 
Gabriel Genellina



From vinay_sajip at yahoo.co.uk  Tue Mar 23 04:10:36 2010
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Tue, 23 Mar 2010 01:10:36 -0700 (PDT)
Subject: logging: local functions ==> loss of lineno
References: <mailman.576.1268256192.23598.python-list@python.org> 
	<hnaj9c$i0u$02$1@news.t-online.com> <4BA295A1.70207@hellmutweber.de> 
	<mailman.972.1268995215.23598.python-list@python.org>
	<hnvqe5$vc$02$1@news.t-online.com> 
	<mailman.977.1269006574.23598.python-list@python.org>
	<ho21dt$b6v$00$1@news.t-online.com>
Message-ID: <d35c950b-c6e5-4162-8175-3e0a0255c71a@30g2000yqi.googlegroups.com>

On Mar 20, 8:36?am, Peter Otten <__pete... at web.de> wrote:
> Jean-Michel Pichavant wrote:
> > You are still accessing the private attribute of the ?modulelogging.
>
> Just reading it is a significantly more conservative approach than setting
> it to an object with an unusual notion of equality ;)
>
> > My previous remark was misleading, in fact there's nothing you can do
> > about it.
>
> How about replacinglogging._srcfile with fixname(logging.__file__)?
>
> > _srcfile is not meant to be used elsewhere than in theloggingmodule
> > itself.
> > However, I don't wanna sound like I'm rejecting this solution, 1st the
> > OP is satisified with it and since this solution is working, it is still
> > more helpful than anyone noticing that you've accessed a private
> > attribute (some will successfully argue that python allows to do so).
>
> Yeah, I had hoped that I could get away without drawing the "consenting
> adults" wildcard...
>
> > At the very begining of this thread I've provided a complete different
> > approach, instead of using the builtin 'filename' and 'lineno' field of
> > thelogging, use custom fileds with the extra parameter.
>
> > It has also some drawbacks but could be a possible alternative.
>
> Having two filename/lineno sets ist likely to confuse.
>
> Peter

Guys,

Sorry I'm a little late to this discussion. I could add a _findCaller
function to the module (not part of the public API, but replaceable by
someone who really needs to) which does the heavy lifting, and
Logger.findCaller just calls it. Then those who need to can implement
their own strategy, without needing to jump through hoops. Does that
approach sound helpful?

Regards,

Vinay Sajip


From no.email at nospam.invalid  Tue Mar 23 04:17:32 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Tue, 23 Mar 2010 01:17:32 -0700
Subject: GC is very expensive: am I doing something wrong?
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
	<mailman.963.1268958842.23598.python-list@python.org>
	<ho6ai4$b12$2@lust.ihug.co.nz>
	<mailman.1060.1269243742.23598.python-list@python.org>
	<ho8v4q$a4q$2@news.eternal-september.org>
	<mailman.1076.1269310331.23598.python-list@python.org>
	<7xwrx3mxuj.fsf@ruckus.brouhaha.com>
	<pan.2010.03.23.06.32.14@REMOVE.THIS.cybersource.com.au>
Message-ID: <7xr5nbwixv.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
> Well, perhaps one order of magnitude.
>>>> for i in xrange(100):
> ...     n = 32*i+1
> ...     assert hash(2**n) == hash(2)

Try with much more than 100 items (you might want to construct the
entries a little more intricately to avoid such big numbers).  The point
is that access becomes O(N) instead of O(1).  See:

   http://www.cs.rice.edu/~scrosby/hash/

for the consequences.  http://cr.yp.to/critbit.html  discusses the
issue a little more.


From __peter__ at web.de  Tue Mar 23 04:43:54 2010
From: __peter__ at web.de (Peter Otten)
Date: Tue, 23 Mar 2010 09:43:54 +0100
Subject: GC is very expensive: am I doing something wrong?
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
	<mailman.963.1268958842.23598.python-list@python.org>
	<ho6ai4$b12$2@lust.ihug.co.nz>
	<mailman.1060.1269243742.23598.python-list@python.org>
	<ho8v4q$a4q$2@news.eternal-september.org>
	<mailman.1076.1269310331.23598.python-list@python.org>
	<7xwrx3mxuj.fsf@ruckus.brouhaha.com>
	<pan.2010.03.23.06.32.14@REMOVE.THIS.cybersource.com.au>
Message-ID: <ho9uvs$mqe$03$1@news.t-online.com>

Steven D'Aprano wrote:

> On Mon, 22 Mar 2010 22:05:40 -0700, Paul Rubin wrote:
> 
>> Antoine Pitrou <solipsis at pitrou.net> writes:
>>> "Orders of magnitude worse", in any case, sounds very exaggerated.
>> 
>> The worst case can lose orders of magnitude if a lot of values hash to
>> the same bucket.
> 
> 
> Well, perhaps one order of magnitude.
> 
> 
>>>> for i in xrange(100):
> ...     n = 32*i+1
> ...     assert hash(2**n) == hash(2)
> ...
>>>> d1 = dict.fromkeys(xrange(100))
>>>> d2 = dict.fromkeys([2**(32*i+1) for i in xrange(100)])
>>>>
>>>> from timeit import Timer
>>>> setup = "from __main__ import d1, d2"
>>>> t1 = Timer("for k in d1.keys(): x = d1[k]", setup)
>>>> t2 = Timer("for k in d2.keys(): x = d2[k]", setup)
>>>>
>>>> min(t1.repeat(number=1000, repeat=5))
> 0.026707887649536133
>>>> min(t2.repeat(number=1000, repeat=5))
> 0.33103203773498535

But the ratio grows with the number of collisions:

$ python extrapolate.py            
10                                 
0.00120401382446                   
0.00753307342529                   
ratio: 6.25663366337               

100
0.00542402267456
0.316139936447  
ratio: 58.2851428571

1000
0.00553417205811
3.36690688133
ratio: 608.384930209

$ cat extrapolate.py
from timeit import Timer

class Item(object):
    def __init__(self, value, hash=None):
        self.value = value
        self.hash = value if hash is None else hash
    def __eq__(self, other):
        return self.value == other.value
    def __hash__(self):
        return self.hash

setup = "from __main__ import d"
bench = "for k in d: x = d[k]"

for n, number in (10,100), (100,100), (1000,10):
    print n
    d1 = dict.fromkeys(Item(i) for i in xrange(n))
    d2 = dict.fromkeys(Item(i, 0) for i in xrange(n))
    ab = []
    for d in d1, d2:
        t = Timer(bench, setup)
        ab.append(min(t.repeat(number=number, repeat=3)))
        print ab[-1]
    print "ratio:", ab[1]/ab[0]
    print


See also http://xkcd.com/605/

Peter


From bruno.42.desthuilliers at websiteburo.invalid  Tue Mar 23 05:13:05 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 23 Mar 2010 10:13:05 +0100
Subject: How to automate accessor definition?
In-Reply-To: <4ba7aa87$0$4974$607ed4bc@cv.net>
References: <ho3heq$61v$1@reader1.panix.com>
	<639908184290880449.447600deets-nospam.web.de@news.hansenet.de>
	<ho5j64$22l$1@reader1.panix.com>
	<mailman.1030.1269194878.23598.python-list@python.org>
	<ho7sqi$jq$1@reader1.panix.com>
	<4ba79040$0$22397$426a74cc@news.free.fr>
	<4ba7aa87$0$4974$607ed4bc@cv.net>
Message-ID: <4ba8861b$0$17824$426a74cc@news.free.fr>

John Posner a ?crit :
> On 3/22/2010 11:44 AM, Bruno Desthuilliers wrote:
> 
> <snip>
> 
>> Another (better IMHO) solution is to use a plain property, and store the
>> computed value as an implementation attribute :
>>
>> @property
>> def foo(self):
>> cached = self.__dict__.get('_foo_cache')
>> if cached is None:
>> self._foo_cache = cached = self._some_time_consuming_operation()
>> return cached
>>
> 
> There's no need to access __dict__ directly.

Nope, inded. I guess I wrote it that way to make clear that we were 
looking for an instance attribute (as a sequel of my previous writing on 
attribute lookup rules).

> I believe this is 
> equivalent (and clearer):
> 
>  @property
>  def foo(self):
>      try:
>          cached = self._foo_cache
>      except AttributeError:
>          self._foo_cache = cached = self._time_consuming_op()
>      return cached
> 

This is functionally _almost_ equivalent - won't work the same if 
there's a class attribute "_foo_cache", which might or not be a good 
thing !-)

Will possibly be a bit faster after the first access - IIRC setting up 
an error handler is by itself cheaper than doing a couple attribute 
access and a method call - but I'd timeit before worrying about it.


From krister.svanlund at gmail.com  Tue Mar 23 05:23:53 2010
From: krister.svanlund at gmail.com (Krister Svanlund)
Date: Tue, 23 Mar 2010 10:23:53 +0100
Subject: Problem with sys.path when embedding Python3 in C
In-Reply-To: <op.u90d29ajx6zn5v@lepton.softlabbsas.com.ar>
References: <2cf430a61003221419t2192c9aajd3c2d2922b1d7f12@mail.gmail.com>
	<op.u90d29ajx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <2cf430a61003230223i32c06f01je20e698c119b1bb1@mail.gmail.com>

On Tue, Mar 23, 2010 at 8:07 AM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar> wrote:
> En Mon, 22 Mar 2010 18:19:49 -0300, Krister Svanlund
> <krister.svanlund at gmail.com> escribi?:
>
>> Hi, I've recently begun experimenting with embedding python and i got
>> a small problem.
>>
>> The following line here is the ugly-hack I had to do to make it work,
>> nothing else I know of makes it possible to import modules from
>> startup directory. So my question is: Is there a prettier way to do
>> this?
>
> The startup directory is not included in the module search path - neither in
> your embedded version, nor in the standard interpreter (it's only included
> when running in interactive mode).
>
>>> PyRun_SimpleString("import sys\nsys.path.append(\"\")");
>
> If you really want the current directory in sys.path, use the getcwd
> function to obtain it. But make sure this is what you want - the directory
> containing the executable might be a better choice (at least more
> predictable).
> Note that Python already provides lots of ways to add directories to
> sys.path (the default search path (see site.py), per-user site directories
> (see PEP370), .pth files, the PYTHONPATH and PYTHONHOME environment
> variables, the Windows registry, other ways I forgot...) So I'd ask why do
> you want to add a non-standard one.
>
> In C code, you can alter the initial search path by setting
> ?Py_SetProgramName and Py_SetPythonHome. And you may even completely replace
> getpathp.c source file with your own.
>
> --
> Gabriel Genellina
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>

The thing is that I want the application to be able to import modules
I've written, but yeah, the applications directory is what I want
rather than the cwd. I have tried Py_SetProgramName but haven't gotten
it to work or cause any change at all to the import behaviour. Could
you possibly provide som sort of example?


From no.email at nospam.invalid  Tue Mar 23 05:57:56 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Tue, 23 Mar 2010 02:57:56 -0700
Subject: GC is very expensive: am I doing something wrong?
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
	<mailman.963.1268958842.23598.python-list@python.org>
	<ho6ai4$b12$2@lust.ihug.co.nz>
	<mailman.1060.1269243742.23598.python-list@python.org>
	<ho8v4q$a4q$2@news.eternal-september.org>
	<mailman.1076.1269310331.23598.python-list@python.org>
	<7xwrx3mxuj.fsf@ruckus.brouhaha.com>
	<mailman.1083.1269338807.23598.python-list@python.org>
Message-ID: <7xpr2v2wd7.fsf@ruckus.brouhaha.com>

Stefan Behnel <stefan_ml at behnel.de> writes:
> While this is theoretically true, and it's good to be aware of this
> possibility, common string hash functions make it so rare in practice
> that a hash table will almost always outperform a trie for exact
> lookups. If it happens, it will either show up clearly enough in
> benchmarks or not be worth bothering.

It is unlikely to happen by accident.  You might care that it can
happen on purpose.  See: http://www.cs.rice.edu/~scrosby/hash/
that I cited in another post.  The article shows some sample attacks
on Python cgi's.



From stefan_ml at behnel.de  Tue Mar 23 06:05:36 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 23 Mar 2010 11:05:36 +0100
Subject: GC is very expensive: am I doing something wrong?
In-Reply-To: <7xwrx3mxuj.fsf@ruckus.brouhaha.com>
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>	<mailman.963.1268958842.23598.python-list@python.org>	<ho6ai4$b12$2@lust.ihug.co.nz>	<mailman.1060.1269243742.23598.python-list@python.org>	<ho8v4q$a4q$2@news.eternal-september.org>	<mailman.1076.1269310331.23598.python-list@python.org>
	<7xwrx3mxuj.fsf@ruckus.brouhaha.com>
Message-ID: <hoa3pg$pr8$1@dough.gmane.org>

Paul Rubin, 23.03.2010 06:05:
> Antoine Pitrou writes:
>> "Orders of magnitude worse", in any case, sounds very exaggerated.
>
> The worst case can lose orders of magnitude if a lot of values hash
> to the same bucket.

While this is theoretically true, and it's good to be aware of this 
possibility, common string hash functions make it so rare in practice that 
a hash table will almost always outperform a trie for exact lookups. If it 
happens, it will either show up clearly enough in benchmarks or not be 
worth bothering.

Stefan



From python at hope.cz  Tue Mar 23 06:48:38 2010
From: python at hope.cz (Johny)
Date: Tue, 23 Mar 2010 03:48:38 -0700 (PDT)
Subject: How to find the best solution ?
Message-ID: <b5d9524e-cdc5-45e8-a412-8d340ebfc21c@o30g2000yqb.googlegroups.com>

I have a text and would like  to split the text into smaller parts,
say into 100 characters each. But if  the 100th character is not a
blank ( but word) this must be less than 100 character.That means the
word itself can not be split.
These smaller parts must contains only whole( not split) words.
I was thinking  about  RegEx but do not know how to find the correct
Regular Expression.
Can anyone help?
Thanks
L.


From mail at timgolden.me.uk  Tue Mar 23 06:54:33 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 23 Mar 2010 10:54:33 +0000
Subject: How to find the best solution ?
In-Reply-To: <b5d9524e-cdc5-45e8-a412-8d340ebfc21c@o30g2000yqb.googlegroups.com>
References: <b5d9524e-cdc5-45e8-a412-8d340ebfc21c@o30g2000yqb.googlegroups.com>
Message-ID: <4BA89DE9.5080001@timgolden.me.uk>

On 23/03/2010 10:48, Johny wrote:
> I have a text and would like  to split the text into smaller parts,
> say into 100 characters each. But if  the 100th character is not a
> blank ( but word) this must be less than 100 character.That means the
> word itself can not be split.
> These smaller parts must contains only whole( not split) words.
> I was thinking  about  RegEx but do not know how to find the correct
> Regular Expression.
> Can anyone help?
> Thanks
> L.

Have a look at the textwrap module

TJG


From alfps at start.no  Tue Mar 23 06:54:45 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Tue, 23 Mar 2010 11:54:45 +0100
Subject: Some silly code for Easter holiday
Message-ID: <hoa6lr$u6o$1@news.eternal-september.org>

This program simulates some colored balls moving around, changing color 
according to certain rules. I think the most interesting is perhaps to not look 
at this code but just try to run it and figure out the color changing rules from 
observing the effect (extra mystery: why I wrote this). Sort of like an Easter 
holiday mystery.


<code>
# Py3
# Copyright 2010 Alf P. Steinbach
import tkinter as tk
from collections import namedtuple
import random

Point           = namedtuple( "Point", "x, y" )
Size            = namedtuple( "Size", "x, y" )
RGB             = namedtuple( "RGB", "r, g, b" )

def generator( g ):
     assert isinstance( g, type( (i for i in ()) ) )
     return g

def tk_internal_bbox_from( bbox: tuple ):
     return ((bbox[0], bbox[1], bbox[2]+2, bbox[3]+2))

def tk_new_ellipse( canvas, bbox: tuple, **kwargs ):
     return canvas.create_oval( tk_internal_bbox_from( bbox ), **kwargs )

class TkTimer:
     def __init__( self, widget, msecs: int, action, start_running: bool = True ):
         self._widget = widget
         self._msecs = msecs
         self._action = action
         self._id = None
         if start_running: self.start()

     def start( self ):
         self._id = self._widget.after( self._msecs, self._on_timer )

     def stop( self ):
         id = self._id;
         self._id = None
         self._widget.after_cancel( id )     # Try to cancel last event.

     def _on_timer( self ):
         if self._id is not None:
             self._action()
             self.start()

class TkEllipse:
     def __init__( self, canvas, bbox: tuple, **kwargs ):
         self._canvas = canvas
         self._id = tk_new_ellipse( canvas, bbox, **kwargs )

     @property   # id
     def id( self ):     return self._id

     @property   # fill
     def fill( self ):
         return self._canvas.itemcget( self._id, "fill" )
     @fill.setter
     def fill( self, color_representation: str ):
         self._canvas.itemconfigure( self._id,
             fill = color_representation
             )

     @property   # internal_bbox
     def internal_bbox( self ):
         return tuple( self._canvas.coords( self._id ) )

     @property   # position
     def position( self ):
         bbox = self.internal_bbox
         return Point( bbox[0], bbox[1] )
     @position.setter
     def position( self, new_pos: Point ):
         bbox = self.internal_bbox
         (dx, dy) = (new_pos.x - bbox[0], new_pos.y - bbox[1])
         self._canvas.move( self._id, dx, dy )
         #assert self.position == new_pos

class Color:
     def __init__( self, rgb_or_name ):
         if isinstance( rgb_or_name, RGB ):
             name = None
             rgb = rgb_or_name
         else:
             assert isinstance( rgb_or_name, str )
             name = rgb_or_name
             rgb = None
         self._name = name
         self._rgb = rgb

     @property
     def representation( self ):
         if self._name is not None:
             return self._name
         else:
             rgb = self._rgb
             return "#{:02X}{:02X}{:02X}".format( rgb.r, rgb.g, rgb.b )

     def __str__( self ):    return self.representation
     def __hash__( self ):   return hash( self.representation )

class Rectangle:
     def __init__( self,
         width       : int,
         height      : int,
         upper_left  : Point = Point( 0, 0 )
         ):
         self._left = upper_left.x
         self._right = upper_left.x + width
         self._top = upper_left.y
         self._bottom = upper_left.y + height

     @property   # left
     def left( self ):       return self._left

     @property   # top
     def top( self ):        return self._top

     @property   # right
     def right( self ):      return self._right

     @property   # bottom
     def bottom( self ):     return self._bottom

     @property   # width
     def width( self ):      return self._right - self._left

     @property   # height
     def height( self ):     return self._bottom - self._top

     @property   # size
     def size( self ):       return Size( self.width, self.height )


class Ball:
     def __init__( self,
         color           : Color,
         position        : Point = Point( 0, 0 ),
         velocity        : Point = Point( 0, 0 )
         ):
         self.color      = color
         self.position   = position
         self.velocity   = velocity

     def squared_distance_to( self, other ):
         p1 = self.position
         p2 = other.position
         return (p2.x - p1.x)**2 + (p2.y - p1.y)**2

class BallSim:
     def __init__( self,
         rect                : Rectangle,
         n_balls             : int = 1
         ):
         def random_pos():
             return Point(
                 random.randrange( rect.left, rect.right ),
                 random.randrange( rect.top, rect.bottom )
                 )
         def random_velocity():
             return Point(
                 random.randint( -10, 10 ),
                 random.randint( -10, 10 )
                 )
         def balls( color ):
             return generator(
                 Ball( color, random_pos(), random_velocity() ) for i in range( 
n_balls )
                 )
         self._rect              = rect
         self._kind_1_color      = Color( "blue" )
         self._kind_2_color      = Color( "orange" )
         self._balls             = tuple( balls( self._kind_1_color ) )
         self._is_close_distance = 20;

     @property   # rect
     def rect( self ):       return self._rect

     @property   # interaction_radius
     def interaction_radius( self ):
         return self._is_close_distance

     @property   # n_balls
     def n_balls( self ):    return len( self._balls )

     def ball( self, i ):    return self._balls[i]
     def balls( self ):      return self._balls

     def _update_positions_and_velocities( self ):
         rect = self._rect
         for ball in self._balls:
             pos = ball.position;  v = ball.velocity;
             pos = Point( pos.x + v.x, pos.y + v.y )
             if pos.x < 0:
                 pos = Point( -pos.x, pos.y )
                 v = Point( -v.x, v.y )
             if pos.x >= rect.width:
                 pos = Point( 2*rect.width - pos.x, pos.y )
                 v = Point( -v.x, v.y )
             if pos.y < 0:
                 pos = Point( pos.x, -pos.y )
                 v = Point( v.x, -v.y )
             if pos.y >= rect.height:
                 pos = Point( pos.x, 2*rect.height - pos.y )
                 v = Point( v.x, -v.y )
             ball.position = pos
             ball.velocity = v

     def _balls_possibly_close_to( self, ball ):
         max_d_squared = self._is_close_distance**2
         result = []
         for other in self._balls:
             if other is ball:
                 continue
             if ball.squared_distance_to( other ) <= max_d_squared:
                 result.append( other )
         return result

     def _update_kinds( self ):
         max_d_squared = self._is_close_distance**2
         for ball in self._balls:
             if ball.color == self._kind_1_color:
                 for other_ball in self._balls_possibly_close_to( ball ):
                     if ball.squared_distance_to( other_ball ) <= max_d_squared:
                         if other_ball.color == self._kind_1_color:
                             ball.color = self._kind_2_color
                             other_ball.color = self._kind_2_color
                             break
             else:
                 if random.random() < 0.01:
                     ball.color = self._kind_1_color

     def evolve( self ):
         self._update_positions_and_velocities()
         self._update_kinds()

class View:
     def _create_widgets( self, parent_widget, sim: BallSim ):
         self.widget = tk.Frame( parent_widget )
         if True:
             canvas = tk.Canvas(
                 self.widget, bg = "white", width = sim.rect.width, height = 
sim.rect.height
                 )
             canvas.pack()
             self._canvas = canvas
             self._circles = []
             radius = sim.interaction_radius // 2
             self._ball_radius = radius
             for ball in sim.balls():
                 (x, y) = (ball.position.x, ball.position.y)
                 bbox = (x - radius, y - radius, x + radius, y + radius)
                 ellipse = TkEllipse( canvas, bbox, fill = 
ball.color.representation )
                 self._circles.append( ellipse )
         pass

     def __init__( self, parent_widget, sim: BallSim ):
         self._create_widgets( parent_widget, sim )
         self._sim = sim

     def update( self ):
         sim = self._sim
         r = self._ball_radius
         for (i, ball) in enumerate( sim.balls() ):
             center_pos = ball.position
             self._circles[i].position = Point( center_pos.x - r, center_pos.y - r )
             self._circles[i].fill = ball.color

class Controller:
     def __init__( self, main_window ):
         self._window = main_window

         self._model = BallSim( Rectangle( 600, 500 ), n_balls = 20 )

         self._view = view = View( main_window, self._model )
         view.widget.place( relx = 0.5, rely = 0.5, anchor="center" )
         self._timer = TkTimer( main_window, msecs = 42, action = self._on_timer )

     def _on_timer( self ):
         self._model.evolve()
         self._view.update()


def main():
     window = tk.Tk()
     window.title( "Sim 1 -- Chameleon Balls" )
     window.geometry( "640x510" )

     controller = Controller( window )
     window.mainloop()

main()
</code>


Cheers,

- Alf


From jeanmichel at sequans.com  Tue Mar 23 06:55:16 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Tue, 23 Mar 2010 11:55:16 +0100
Subject: short-circuiting any/all ?
In-Reply-To: <ho98sc$abv$1@reader1.panix.com>
References: <ho7vq2$1s5$1@reader1.panix.com>	<291d82b7-b13b-4f49-901c-8194f3e07598@e7g2000yqf.googlegroups.com>	<ho8d0a$261$1@reader1.panix.com>	<mailman.1069.1269283393.23598.python-list@python.org>	<ho8qed$ap0$1@reader1.panix.com>	<pan.2010.03.23.01.30.37@REMOVE.THIS.cybersource.com.au>
	<ho98sc$abv$1@reader1.panix.com>
Message-ID: <4BA89E14.3050507@sequans.com>

kj wrote:
> Arguably, Knuth's "premature optimization is the root of all evil"
> applies even to readability (e.g. "what's the point of making code
> optimally readable if one is going to change it completely next
> day?") 
The guy who will change it will have to read it. The only waste would be 
if the code would never be read again.
>  If there were the equivalent of a profiler for code clutter,
> I guess I could relax my readability standards a bit...
>
> ~K
>   
Don't relax, just keep up :o)

JM


From alexandre.fayolle at logilab.fr  Tue Mar 23 07:48:44 2010
From: alexandre.fayolle at logilab.fr (Alexandre Fayolle)
Date: Tue, 23 Mar 2010 12:48:44 +0100
Subject: ANN: Pylint bug day, 2nd edition
In-Reply-To: <201003221838.07672.alexandre.fayolle@logilab.fr>
References: <201003221838.07672.alexandre.fayolle@logilab.fr>
Message-ID: <201003231248.44408.alexandre.fayolle@logilab.fr>

On Monday 22 March 2010 18:38:07 Alexandre Fayolle wrote:
> .. _pylint bugs day: https://www.logilab.net/elo/blogentry/18781

Correct link is : http://www.logilab.org/blogentry/18781

Sorry for the inconvenience. 

-- 
Alexandre Fayolle                              LOGILAB, Paris (France)
Formations Python, CubicWeb, Debian :  http://www.logilab.fr/formations
D?veloppement logiciel sur mesure :      http://www.logilab.fr/services
Informatique scientifique:               http://www.logilab.fr/science


From phil at freehackers.org  Tue Mar 23 08:38:37 2010
From: phil at freehackers.org (BlueBird)
Date: Tue, 23 Mar 2010 05:38:37 -0700 (PDT)
Subject: SOAP 1.2 Python client ?
References: <5a36bd30-6cbd-48ca-9ca3-dc34c97e03c0@o30g2000yqb.googlegroups.com>
	<mailman.227.1267644925.23598.python-list@python.org>
	<fcaa9201-5e94-4cf3-af6e-78c1bbcb6144@t20g2000yqe.googlegroups.com>
	<13753751-d0af-48df-b78d-5b371109e05c@t41g2000yqt.googlegroups.com>
Message-ID: <e4620dbf-b8c6-414e-8e0a-b51640def9a5@o30g2000yqb.googlegroups.com>

On 5 mar, 13:19, lbolla <lbo... at gmail.com> wrote:
> On Mar 5, 10:01?am, BlueBird <p... at freehackers.org> wrote:
>
>
>
>
>
> > On 3 mar, 20:35, Stefan Behnel <stefan... at behnel.de> wrote:
>
> > > BlueBird, 03.03.2010 17:32:
>
> > > > I am looking for aSOAP1.2 python client. To my surprise, it seems
> > > > that this does not exist. Does anybody know about this ?
>
> > >SOAPmay be an overly bloated protocol, but it's certainly not black magic.
> > > It's not hard to do manually if you really need to:
>
> > >http://effbot.org/zone/element-soap.htm
>
> > But this requires a goog knowloedge ofSOAP, in order to parse
> > everything correctly. The reason I want to use a ready-made client is
> > that I have about zero knowledge aboutSOAP, and even more in the
> > differences betweenSOAP1.1 and 1.2 .
>
> > cheers,
>
> > Philippe
>
> I use a thin custom-made python wrapper around gSoap[1], which is tens
> of times faster than ZSI.

I looked at gSoap and the solution seemed really nice. They can
generate C that I can call with ctypes.

The only problem is that I am working on a closed source software and
their licensing cost for close source were too expensive for my
company.

After much much digging, we found out the problem and managed to solve
it with SUDS. When calling a .NET service, you should not reference
the soap envelope spec with 'http://schemas.xmlsoap.org/soap/
envelope/' but with 'http://schemas.xmlsoap.org/soap/envelope' .
The .NET server implementation seems to be very picky about the
last / .

Yeah for SUDS and oooooh for .NET

cheers,

Philippe



From saimapk81 at gmail.com  Tue Mar 23 08:54:01 2010
From: saimapk81 at gmail.com (saima81)
Date: Tue, 23 Mar 2010 05:54:01 -0700 (PDT)
Subject: "jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
	citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
	manager" 
	"usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
Message-ID: <3214acd7-f057-4444-9ff8-d6402d7a4b30@u5g2000prd.googlegroups.com>

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citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
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citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
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citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
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citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
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citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
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From vlastimil.brom at gmail.com  Tue Mar 23 10:18:17 2010
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Tue, 23 Mar 2010 15:18:17 +0100
Subject: individually updating unicodedata db?
In-Reply-To: <op.u90eslyux6zn5v@lepton.softlabbsas.com.ar>
References: <9fdb569a1003221719k50345867vfc4a47683e877aae@mail.gmail.com>
	<op.u90eslyux6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <9fdb569a1003230718u37d2e2dem944e4141def631b0@mail.gmail.com>

2010/3/23 Gabriel Genellina <gagsl-py2 at yahoo.com.ar>:
> En Mon, 22 Mar 2010 21:19:04 -0300, Vlastimil Brom
> <vlastimil.brom at gmail.com> escribi?:
>
>> I guess, I am stuck here, as I use the precompiled version supplied in
>> the windows installer and can't compile python from source to obtain
>> the needed unicodedata.pyd.
>
> You can recompile Python from source, on Windows, using the free Microsoft?
> Visual C++? 2008 Express Edition.
> http://www.microsoft.com/express/Windows/
>
> Fetch the required dependencies using Tools\buildbot\external.bat, and then
> execute PCbuild\env.bat and build.bat. See readme.txt in that directory for
> details. It should build cleanly.
>
> --
> Gabriel Genellina
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Thanks for the hints; i probably screwed some steps up in some way,
but the result seem to be working for the most part; I'll try to
summarise it just for the record (also hoping to get further
suggestions):
I used the official source tarball for python 2.6.5 from:
http://www.python.org/download/

In the unpacked sources, I edited the file:
...\Python-2.6.5-src\Tools\unicode\makeunicodedata.py

import re # added
...
# UNIDATA_VERSION = "5.1.0" # changed to:
UNIDATA_VERSION = "5.2.0"

Furthermore the following text files were copied to the same directory
like makeunicodedata.py

CompositionExclusions-3.2.0.txt
EastAsianWidth-3.2.0.txt
UnicodeData-3.2.0.txt
UnicodeData.txt
EastAsianWidth.txt
CompositionExclusions.txt

from
http://unicode.org/Public/3.2-Update/
and
http://unicode.org/Public/5.2.0/ucd/

furthermore there are some files in the subdirectories needed:
...\Python-2.6.5-src\Tools\unicode\Objects\unicodetype_db.h
...\Python-2.6.5-src\Tools\unicode\Modules\unicodedata_db.h
...\Python-2.6.5-src\Tools\unicode\Modules\unicodename_db.h

After running makeunicodedata.py, the above headers are recreated from
the new unicode database and can be copied to the original locations
in the source

...\Python-2.6.5-src\Objects\unicodetype_db.h
...\Python-2.6.5-src\Modules\unicodedata_db.h
...\Python-2.6.5-src\Modules\unicodename_db.h

(while keeping the backups)

Trying to run
...\Python-2.6.5-src\Tools\buildbot\external.bat and other bat files,
I got quite a few path mismatches resulting in file ... not found
errors;

However, I was able to just open the solution file in Visual C++ 2008 Express:
C:\install\Python-2.6.5-src\PCbuild\pcbuild.sln
set the build configuration to "release" and try to build the sources.

There were some errors in particular modules (which might be due to my
mistakes or ommissions, as this maybe shouldn't happen normally), but
the wanted
...\Python-2.6.5-src\PCbuild\unicodedata.pyd
was generated and can be used in the original python installation:
C:\Python26\DLLs\unicodedata.pyd

the newly added characters, cf.:
http://www.unicode.org/Public/UNIDATA/DerivedAge.txt
seem to be available

 ? (dec.: 8528)  (hex.: 0x2150) # ? VULGAR FRACTION ONE SEVENTH (Number, Other)
 ? (dec.: 68352)  (hex.: 0x10b00) # ? AVESTAN LETTER A (Letter, Other)

but some are not present; I noticed this for
the new CJK block - CJK Unified Ideographs Extension C (U+2A700..U+2B73F).
Probably this new range isn't taken into account for some reason.

All in all, I am happy to have the current version of the unicode
database available; I somehow expected this to be more complicated,
but on the other hand I can't believe this is the standard way of
preparing the built versions (with all the copying,checking and and
replacing the files); it might be possible, that the actual
distribution is built using some different tools (the trivial missing
import in makeunicodedata.py would be found immediately, I guess).

I also wanted to ask, whether the missing characters might be a result
of my error in updating the unicode database, or could it be a problem
with the makeunicodedata.py itself?

Thanks in advance and sorry for this long post.
    vbr


From peter at psantoro.net  Tue Mar 23 10:38:20 2010
From: peter at psantoro.net (peter at psantoro.net)
Date: 23 Mar 2010 07:38:20 -0700
Subject: RELEASED Python 2.6.5
References: <mailman.990.1269039418.23598.python-list@python.org>
Message-ID: <hoajos028di@drn.newsguy.com>

Thank you everyone for all the work that went into this update, but there may be
a small problem with the Windows x86 installer.

I've built and used python 2.6.5 on linux without any apparent problems, but the
Windows x86 binary installer stops after compiling a few python source files.

I've tried the Windows x86 installer on two differently configured Windows XP
PCs (SP3 with patches), but I get the following errors during the advanced
compiling of python source files:

"There is a problem with this Windows Installer package.  A program run as part
of the setup did not finish as expected.  Contact your support personnel or
package vendor."

"Python 2.6.5 Installer ended prematurely ..."

The md5sum of the Windows x86 installer matched the published value.  I did not
try not using the advanced option.  I reinstalled python 2.6.4 on both of the
PCs without any problems and used the advanced compile option.

Is anyone else having trouble with the 2.6.5 Windows x86 installer?

Peter



From omrihsan at gmail.com  Tue Mar 23 10:49:08 2010
From: omrihsan at gmail.com (Omer Ihsan)
Date: Tue, 23 Mar 2010 07:49:08 -0700 (PDT)
Subject: device identification
References: <9c7ed2c8-f04b-4302-a4be-bde1628ef966@y11g2000prf.googlegroups.com>
	<46ggq59e49qpna7f9ae6q8ftobhot351un@4ax.com>
Message-ID: <57c86289-85e7-4c9f-b7ed-787687d9a5b6@x23g2000prd.googlegroups.com>

On Mar 23, 9:22?am, Tim Roberts <t... at probo.com> wrote:
> Omer Ihsan <omrih... at gmail.com> wrote:
>
> >i have installed pyusb now and run the sample usbenum.py....i have 3
> >usb ports on my PC but the results show 6 outputs to
> >dev.filename..they are numbers like 001 or 005 etc.... and they
> >changed when i plugged in devices...(i am no good with the usb
> >standards)....i just want to identify each device/port... what
> >parameter in the example would help me....
>
> You can't identify the ports.[1] ?What good would it do you? ?The ports on
> your PC are not numbered.
>
> You certainly CAN identify the devices, by their VID and PID (or idVendor
> and idProduct). ?You identify by function, not by location. ?When you plug
> in a USB drive, you don't want to worry about where it's plugged in.
> ===
> [1]: OK, technically, it is not impossible to identify the port numbers,
> but it is quite tedious. ?You need to chase through the sysfs expansion of
> your buses hub/port tree and find a match for your device. ?It's not worth
> the trouble.
> --
> Tim Roberts, t... at probo.com
> Providenza & Boekelheide, Inc.

VID and PID is fair enough. now what i want is that i have a threaded
code that threads two functions to run at the same time. i want each
function to run seperate devices. the problem is if it doesnt identify
the attached devices it might run the code on a single device which
isnt what is required.
how will i be able to run a code on a device of my choice???....you
can leave away the threading part for now.


From alley at dragoncreativeworks.net  Tue Mar 23 12:04:21 2010
From: alley at dragoncreativeworks.net (Allan Davis)
Date: Tue, 23 Mar 2010 11:04:21 -0500
Subject: RELEASED Python 2.6.5
In-Reply-To: <hoajos028di@drn.newsguy.com>
References: <mailman.990.1269039418.23598.python-list@python.org>
	<hoajos028di@drn.newsguy.com>
Message-ID: <61c507641003230904w41a028dbl21e83fc4399dc6cf@mail.gmail.com>

I just downloaded the installer and tested it on my win xp machine.  The
installer worked fine.


--------------------------------------------------------------
Allan Davis
Member of NetBeans Dream Team
http://wiki.netbeans.org/NetBeansDreamTeam
Lead Developer, nbPython
http://wiki.netbeans.org/Python
http://codesnakes.blogspot.com (my blog)
Co-Chair, CajunJUG
http://www.cajunjug.org


On Tue, Mar 23, 2010 at 9:38 AM, <peter at psantoro.net> wrote:

> Thank you everyone for all the work that went into this update, but there
> may be
> a small problem with the Windows x86 installer.
>
> I've built and used python 2.6.5 on linux without any apparent problems,
> but the
> Windows x86 binary installer stops after compiling a few python source
> files.
>
> I've tried the Windows x86 installer on two differently configured Windows
> XP
> PCs (SP3 with patches), but I get the following errors during the advanced
> compiling of python source files:
>
> "There is a problem with this Windows Installer package.  A program run as
> part
> of the setup did not finish as expected.  Contact your support personnel or
> package vendor."
>
> "Python 2.6.5 Installer ended prematurely ..."
>
> The md5sum of the Windows x86 installer matched the published value.  I did
> not
> try not using the advanced option.  I reinstalled python 2.6.4 on both of
> the
> PCs without any problems and used the advanced compile option.
>
> Is anyone else having trouble with the 2.6.5 Windows x86 installer?
>
> Peter
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From rosymonijasmine at gmail.com  Tue Mar 23 12:05:42 2010
From: rosymonijasmine at gmail.com (Jasmine Rose)
Date: Tue, 23 Mar 2010 09:05:42 -0700 (PDT)
Subject: Stop the Heat from Sun Rays!
Message-ID: <37e5dd24-c8a4-494f-8cf1-1577cf247401@u15g2000prd.googlegroups.com>

Stop the Heat! Stop UV Damage! Save Money! - More Details :
http://www.suntechglasstinting.com/welcome.php


From solipsis at pitrou.net  Tue Mar 23 12:53:34 2010
From: solipsis at pitrou.net (Antoine Pitrou)
Date: Tue, 23 Mar 2010 16:53:34 +0000 (UTC)
Subject: GC is very expensive: am I doing something wrong?
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
	<mailman.963.1268958842.23598.python-list@python.org>
	<ho6ai4$b12$2@lust.ihug.co.nz>
	<mailman.1060.1269243742.23598.python-list@python.org>
	<ho8v4q$a4q$2@news.eternal-september.org>
	<mailman.1076.1269310331.23598.python-list@python.org>
	<7xwrx3mxuj.fsf@ruckus.brouhaha.com>
	<mailman.1083.1269338807.23598.python-list@python.org>
	<7xpr2v2wd7.fsf@ruckus.brouhaha.com>
Message-ID: <hoarme$kpt$1@dough.gmane.org>

Le Tue, 23 Mar 2010 02:57:56 -0700, Paul Rubin a ?crit?:
> 
> It is unlikely to happen by accident.  You might care that it can happen
> on purpose.  See: http://www.cs.rice.edu/~scrosby/hash/ that I cited in
> another post.  The article shows some sample attacks on Python cgi's.

Certainly interesting in a purely academic point of view, but in real 
life if you want to cause a denial of service by overwhelming a server, 
there are far more obvious options than trying to guess the server's use 
of hash tables and trying to cause lots of collisions in them.



From jfernand57 at gmail.com  Tue Mar 23 12:55:30 2010
From: jfernand57 at gmail.com (Jose Manuel)
Date: Tue, 23 Mar 2010 09:55:30 -0700 (PDT)
Subject: Python is cool!!
Message-ID: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>

I have been learning Python, and it is amazing .... I am using the
tutorial that comes with the official distribution.

At the end my goal is to develop applied mathematic in engineering
applications to be published on the Web, specially on app. oriented to
simulations and control systems, I was about to start learning Java
but I found Python which seems easier to learn that Java.

Would it be easy to integrate Python in Web pages with HTML? I have
read many info on Internet saying it is, and I hope so ....

Any opinion


From mehgcap at gmail.com  Tue Mar 23 13:01:21 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Tue, 23 Mar 2010 13:01:21 -0400
Subject: using message loop for hotkey capturing
Message-ID: <bc7f680c1003231001rfeb6f33ve4d04d36d32e737a@mail.gmail.com>

Hi all, but mainly Tim Golden:
Tim, I am using your wonderful message loop for keyboard input, the
one on your site that you pointed me to a few months ago. It has been
working perfectly as long as I had only one dictionary of keys mapping
to one dictionary of functions, but now I want two of each. My program
has different modes, which may have varying keystrokes, and I also
have some global keystrokes which are the same across all modes, like
exiting or switching modes. I cannot figure out how to make the
message loop look in two dictionaries at onc. I tried using an if,
saying that if action_to_take was not set in the mode-specific
dictionary then look at the global dictionary, but it is like it is
never looking in the global dictionary at all. I get no syntax errors
or problems when running the program, so it has to be something in my
logic. Go to
http://www.gateway2somewhere.com/sw/main.pyw
to see what I mean; the problem code is near the very bottom of the
file. Thanks for any suggestions. Oh, please note that I indent one
space per indentation level.

-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From vinay_sajip at yahoo.co.uk  Tue Mar 23 13:06:43 2010
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Tue, 23 Mar 2010 10:06:43 -0700 (PDT)
Subject: Castrated traceback in sys.exc_info()
References: mailman.1078.1269324766.23598.python-list@python.org
Message-ID: <54e357f4-705f-40a8-ac6c-e5ae84f814f7@t23g2000yqt.googlegroups.com>

On Mar 23, 6:12?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Mon, 22 Mar 2010 15:20:39 -0300, Pascal Chambon ?
> <chambon.pas... at wanadoo.fr> escribi???:
>
>
>
>
>
> > Allright, here is more concretely the problem :
>
> > ERROR:root:An error
> > Traceback (most recent call last):
> > ? File "C:/Users/Pakal/Desktop/aaa.py", line 7, in c
> > ? ? return d()
> > ? File "C:/Users/Pakal/Desktop/aaa.py", line 11, in d
> > ? ? def d(): raise ValueError
> > ValueError
>
> > As you see, the traceback only starts from function c, which handles the ?
> > exception.
> > It doesn't show main(), a() and b(), which might however be (and are, in ?
> > my case) critical to diagnose the severity of the problem (since many ?
> > different paths would lead to calling c()).
>
> > So the question is : is that possible to enforce, by a way or another, ?
> > the retrieval of the FULL traceback at exception raising point, instead ?
> > of that incomplete one ?
>
> Thanks for bringing this topic! I learned a lot trying to understand what ?
> happens.
>
> The exception traceback (what sys.exc_info()[2] returns) is *not* a ?
> complete stack trace. The sys module documentation is wrong [1] when it ?
> says "...encapsulates the call stack at the point where the exception ?
> originally occurred."
>
> The Language Reference is more clear [2]: "Traceback objects represent a ?
> stack trace of an exception. A traceback object is created when an ?
> exception occurs. When the search for an exception handler unwinds the ?
> execution stack, at each unwound level a traceback object is inserted in ?
> front of the current traceback. When an exception handler is entered, the ?
> stack trace is made available to the program."
>
> That is, a traceback holds only the *forward* part of the stack: the ?
> frames already exited when looking for an exception handler. Frames going ?
> ?from the program starting point up to the current execution point are ?
> *not* included.
>
> Conceptually, it's like having two lists: stack and traceback. The ?
> complete stack trace is always stack+traceback. At each step (when ?
> unwinding the stack, looking for a frame able to handle the current ?
> exception) an item is popped from the top of the stack (last item) and ?
> inserted at the head of the traceback.
>
> The traceback holds the "forward" path (from the current execution point, ?
> to the frame where the exception was actually raised). It's a linked list, ?
> its tb_next attribute holds a reference to the next item; None marks the ?
> last one.
>
> The "back" path (going from the current execution point to its caller and ?
> all the way to the program entry point) is a linked list of frames; the ?
> f_back attribute points to the previous one, or None.
>
> In order to show a complete stack trace, one should combine both. The ?
> traceback module contains several useful functions: extract_stack() + ?
> extract_tb() are a starting point. The simplest way I could find to make ?
> theloggingmodule report a complete stack is to monkey patch ?logging.Formatter.formatException so it uses format_exception() and ?
> format_stack() combined (in fact it is simpler than the current ?
> implementation using a StringIO object):
>
> <code>
> importlogging
> import traceback
>
> def formatException(self, ei):
> ? ? ?"""
> ? ? ?Format and return the specified exception information as a string.
>
> ? ? ?This implementation builds the complete stack trace, combining
> ? ? ?traceback.format_exception and traceback.format_stack.
> ? ? ?"""
> ? ? ?lines = traceback.format_exception(*ei)
> ? ? ?if ei[2]:
> ? ? ? ? ?lines[1:1] = traceback.format_stack(ei[2].tb_frame.f_back)
> ? ? ?return ''.join(lines)
>
> # monkey patch theloggingmodulelogging.Formatter.formatException = formatException
>
> def a(): return b()
> def b(): return c()
> def c():
> ? ? ?try:
> ? ? ? ?return d()
> ? ? ?except:
> ? ? ? ?logging.exception("An error")
> ? ? ? ?raise
> def d(): raise ValueError
>
> def main():
> ? ?a()
>
> main()
> </code>
>
> Output:
>
> ERROR:root:An error
> Traceback (most recent call last):
> ? ?File "test_logging.py", line 32, in <module>
> ? ? ?main()
> ? ?File "test_logging.py", line 30, in main
> ? ? ?a()
> ? ?File "test_logging.py", line 19, in a
> ? ? ?def a(): return b()
> ? ?File "test_logging.py", line 20, in b
> ? ? ?def b(): return c()
> ? ?File "test_logging.py", line 23, in c
> ? ? ?return d()
> ? ?File "test_logging.py", line 27, in d
> ? ? ?def d(): raise ValueError
> ValueError
>
> Traceback (most recent call last):
> ? ?File "test_logging.py", line 32, in <module>
> ? ? ?main()
> ? ?File "test_logging.py", line 30, in main
> ? ? ?a()
> ? ?File "test_logging.py", line 19, in a
> ? ? ?def a(): return b()
> ? ?File "test_logging.py", line 20, in b
> ? ? ?def b(): return c()
> ? ?File "test_logging.py", line 23, in c
> ? ? ?return d()
> ? ?File "test_logging.py", line 27, in d
> ? ? ?def d(): raise ValueError
> ValueError
>
> Note that both tracebacks are identical: the first comes from the patched ?loggingmodule, the second is the standard Python one.
>
> [1]http://docs.python.org/library/sys.html#sys.exc_info
> [2] ?http://docs.python.org/reference/datamodel.html#the-standard-type-hie...
>
> --
> Gabriel Genellina

Good catch, Gabriel.

There should be no need to monkey-patch the logging module - it's
better if I include the change in the module itself. The only
remaining question is that of backward compatibility, but I can do
this for Python 2.7/3.2 only so that won't be an issue. It's probably
a good idea to log an issue on the bug tracker, though, so we have
some history for the change - do you want to do that, or shall I?

Regards,

Vinay Sajip


From mail at timgolden.me.uk  Tue Mar 23 13:07:57 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 23 Mar 2010 17:07:57 +0000
Subject: Python is cool!!
In-Reply-To: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
References: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
Message-ID: <4BA8F56D.6060305@timgolden.me.uk>

On 23/03/2010 16:55, Jose Manuel wrote:
> I have been learning Python, and it is amazing .... I am using the
> tutorial that comes with the official distribution.
>
> At the end my goal is to develop applied mathematic in engineering
> applications to be published on the Web, specially on app. oriented to
> simulations and control systems, I was about to start learning Java
> but I found Python which seems easier to learn that Java.
>
> Would it be easy to integrate Python in Web pages with HTML? I have
> read many info on Internet saying it is, and I hope so ....

You probably want to be looking at IronPython and Silverlight.
In fact, the prolific Michael Foord has already produced an
example of this, which gives you the Python tutorial online!

   http://trypython.org

TJG


From mail at timgolden.me.uk  Tue Mar 23 13:09:36 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 23 Mar 2010 17:09:36 +0000
Subject: using message loop for hotkey capturing
In-Reply-To: <bc7f680c1003231001rfeb6f33ve4d04d36d32e737a@mail.gmail.com>
References: <bc7f680c1003231001rfeb6f33ve4d04d36d32e737a@mail.gmail.com>
Message-ID: <4BA8F5D0.7080502@timgolden.me.uk>

On 23/03/2010 17:01, Alex Hall wrote:
> Hi all, but mainly Tim Golden:
> Tim, I am using your wonderful message loop for keyboard input, the
> one on your site that you pointed me to a few months ago. It has been
> working perfectly as long as I had only one dictionary of keys mapping
> to one dictionary of functions, but now I want two of each. My program
> has different modes, which may have varying keystrokes, and I also
> have some global keystrokes which are the same across all modes, like
> exiting or switching modes. I cannot figure out how to make the
> message loop look in two dictionaries at onc. I tried using an if,
> saying that if action_to_take was not set in the mode-specific
> dictionary then look at the global dictionary, but it is like it is
> never looking in the global dictionary at all. I get no syntax errors
> or problems when running the program, so it has to be something in my
> logic. Go to
> http://www.gateway2somewhere.com/sw/main.pyw


Happy to look, Alex, but that link's giving me a 404 at the moment

TJG


From mehgcap at gmail.com  Tue Mar 23 13:29:05 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Tue, 23 Mar 2010 13:29:05 -0400
Subject: using message loop for hotkey capturing
In-Reply-To: <4BA8F5D0.7080502@timgolden.me.uk>
References: <bc7f680c1003231001rfeb6f33ve4d04d36d32e737a@mail.gmail.com>
	<4BA8F5D0.7080502@timgolden.me.uk>
Message-ID: <bc7f680c1003231029m7990dfafqbd7eddc28a358891@mail.gmail.com>

Sorry about that, it is fixed now.

On 3/23/10, Tim Golden <mail at timgolden.me.uk> wrote:
> On 23/03/2010 17:01, Alex Hall wrote:
>> Hi all, but mainly Tim Golden:
>> Tim, I am using your wonderful message loop for keyboard input, the
>> one on your site that you pointed me to a few months ago. It has been
>> working perfectly as long as I had only one dictionary of keys mapping
>> to one dictionary of functions, but now I want two of each. My program
>> has different modes, which may have varying keystrokes, and I also
>> have some global keystrokes which are the same across all modes, like
>> exiting or switching modes. I cannot figure out how to make the
>> message loop look in two dictionaries at onc. I tried using an if,
>> saying that if action_to_take was not set in the mode-specific
>> dictionary then look at the global dictionary, but it is like it is
>> never looking in the global dictionary at all. I get no syntax errors
>> or problems when running the program, so it has to be something in my
>> logic. Go to
>> http://www.gateway2somewhere.com/sw/main.pyw
>
>
> Happy to look, Alex, but that link's giving me a 404 at the moment
>
> TJG
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From python.list at tim.thechases.com  Tue Mar 23 13:31:09 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 23 Mar 2010 12:31:09 -0500
Subject: How to find the best solution ?
In-Reply-To: <b5d9524e-cdc5-45e8-a412-8d340ebfc21c@o30g2000yqb.googlegroups.com>
References: <b5d9524e-cdc5-45e8-a412-8d340ebfc21c@o30g2000yqb.googlegroups.com>
Message-ID: <4BA8FADD.5070709@tim.thechases.com>

Johny wrote:
> I have a text and would like  to split the text into smaller parts,
> say into 100 characters each. But if  the 100th character is not a
> blank ( but word) this must be less than 100 character.That means the
> word itself can not be split.
> These smaller parts must contains only whole( not split) words.
> I was thinking  about  RegEx but do not know how to find the correct
> Regular Expression.

While I suspect you can come close with a regular expression:

   import re, random
   size = 100
   r = re.compile(r'.{1,%i}\b' % size)
   # generate a random text string with a mix of word-lengths
   words = ['a', 'an', 'the', 'four', 'fives', 'sixsix']
   data = ' '.join(random.choice(words) for _ in range(200))
   # for each chunk of 100 characters (or fewer
   # if on a word-boundary), do something
   for bit in r.finditer(data):
     chunk = bit.group(0)
     print "%i: [%s]" % (len(chunk), chunk)

it may have an EOF fencepost error, so you might have to clean up 
the last item.  My simple test seemed to show it worked without 
cleanup though.

-tkc





From pruebauno at latinmail.com  Tue Mar 23 13:33:33 2010
From: pruebauno at latinmail.com (nn)
Date: Tue, 23 Mar 2010 10:33:33 -0700 (PDT)
Subject: Unicode blues in Python3
Message-ID: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>

I know that unicode is the way to go in Python 3.1, but it is getting
in my way right now in my Unix scripts. How do I write a chr(253) to a
file?

#nntst2.py
import sys,codecs
mychar=chr(253)
print(sys.stdout.encoding)
print(mychar)

 > ./nntst2.py
ISO8859-1
?

 > ./nntst2.py >nnout2
Traceback (most recent call last):
  File "./nntst2.py", line 5, in <module>
    print(mychar)
UnicodeEncodeError: 'ascii' codec can't encode character '\xfd' in
position 0: ordinal not in range(128)

> cat nnout2
ascii

..Oh great!

ok lets try this:
#nntst3.py
import sys,codecs
mychar=chr(253)
print(sys.stdout.encoding)
print(mychar.encode('latin1'))

> ./nntst3.py
ISO8859-1
b'\xfd'

> ./nntst3.py >nnout3

> cat nnout3
ascii
b'\xfd'

..Eh... not what I want really.

#nntst4.py
import sys,codecs
mychar=chr(253)
print(sys.stdout.encoding)
sys.stdout=codecs.getwriter("latin1")(sys.stdout)
print(mychar)

 > ./nntst4.py
ISO8859-1
Traceback (most recent call last):
  File "./nntst4.py", line 6, in <module>
    print(mychar)
  File "Python-3.1.2/Lib/codecs.py", line 356, in write
    self.stream.write(data)
TypeError: must be str, not bytes

..OK, this is not working either.

Is there any way to write a value 253 to standard output?


From python at mrabarnett.plus.com  Tue Mar 23 13:54:58 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 23 Mar 2010 17:54:58 +0000
Subject: using message loop for hotkey capturing
In-Reply-To: <bc7f680c1003231001rfeb6f33ve4d04d36d32e737a@mail.gmail.com>
References: <bc7f680c1003231001rfeb6f33ve4d04d36d32e737a@mail.gmail.com>
Message-ID: <4BA90072.9060305@mrabarnett.plus.com>

Alex Hall wrote:
> Hi all, but mainly Tim Golden:
> Tim, I am using your wonderful message loop for keyboard input, the
> one on your site that you pointed me to a few months ago. It has been
> working perfectly as long as I had only one dictionary of keys mapping
> to one dictionary of functions, but now I want two of each. My program
> has different modes, which may have varying keystrokes, and I also
> have some global keystrokes which are the same across all modes, like
> exiting or switching modes. I cannot figure out how to make the
> message loop look in two dictionaries at onc. I tried using an if,
> saying that if action_to_take was not set in the mode-specific
> dictionary then look at the global dictionary, but it is like it is
> never looking in the global dictionary at all. I get no syntax errors
> or problems when running the program, so it has to be something in my
> logic. Go to
> http://www.gateway2somewhere.com/sw/main.pyw
> to see what I mean; the problem code is near the very bottom of the
> file. Thanks for any suggestions. Oh, please note that I indent one
> space per indentation level.
> 
"msg.wParam" gives an int, but the keys of globalFuncs are 'g1', etc,
not ints.

Incidentally, you might want to change:

     if(not action_to_take):

to:

     if action_to_take is None:

in case any of the values happen to be 0 (if not now, then possibly at
some time in the future).


From rami.chowdhury at gmail.com  Tue Mar 23 14:00:09 2010
From: rami.chowdhury at gmail.com (Rami Chowdhury)
Date: Tue, 23 Mar 2010 11:00:09 -0700
Subject: Unicode blues in Python3
In-Reply-To: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
Message-ID: <201003231100.10103.rami.chowdhury@gmail.com>

On Tuesday 23 March 2010 10:33:33 nn wrote:
> I know that unicode is the way to go in Python 3.1, but it is getting
> in my way right now in my Unix scripts. How do I write a chr(253) to a
> file?
>
> #nntst2.py
> import sys,codecs
> mychar=chr(253)
> print(sys.stdout.encoding)
> print(mychar)

The following code works for me:

$ cat nnout5.py 
#!/usr/bin/python3.1

import sys
mychar = chr(253)
sys.stdout.write(mychar)
$ echo $(cat nnout)
?

Can I ask why you're using print() in the first place, rather than writing 
directly to a file? Python 3.x, AFAIK, distinguishes between text and binary 
files and will let you specify the encoding you want for strings you write.

Hope that helps,
Rami
> 
>  > ./nntst2.py
> 
> ISO8859-1
> ?
> 
>  > ./nntst2.py >nnout2
> 
> Traceback (most recent call last):
>   File "./nntst2.py", line 5, in <module>
>     print(mychar)
> UnicodeEncodeError: 'ascii' codec can't encode character '\xfd' in
> position 0: ordinal not in range(128)
> 
> > cat nnout2
> 
> ascii
> 
> ..Oh great!
> 
> ok lets try this:
> #nntst3.py
> import sys,codecs
> mychar=chr(253)
> print(sys.stdout.encoding)
> print(mychar.encode('latin1'))
> 
> > ./nntst3.py
> 
> ISO8859-1
> b'\xfd'
> 
> > ./nntst3.py >nnout3
> > 
> > cat nnout3
> 
> ascii
> b'\xfd'
> 
> ..Eh... not what I want really.
> 
> #nntst4.py
> import sys,codecs
> mychar=chr(253)
> print(sys.stdout.encoding)
> sys.stdout=codecs.getwriter("latin1")(sys.stdout)
> print(mychar)
> 
>  > ./nntst4.py
> 
> ISO8859-1
> Traceback (most recent call last):
>   File "./nntst4.py", line 6, in <module>
>     print(mychar)
>   File "Python-3.1.2/Lib/codecs.py", line 356, in write
>     self.stream.write(data)
> TypeError: must be str, not bytes
> 
> ..OK, this is not working either.
> 
> Is there any way to write a value 253 to standard output?

----
Rami Chowdhury
"Ninety percent of everything is crap." -- Sturgeon's Law
408-597-7068 (US) / 07875-841-046 (UK) / 01819-245544 (BD)


From mehgcap at gmail.com  Tue Mar 23 14:04:15 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Tue, 23 Mar 2010 14:04:15 -0400
Subject: using message loop for hotkey capturing
In-Reply-To: <4BA90072.9060305@mrabarnett.plus.com>
References: <bc7f680c1003231001rfeb6f33ve4d04d36d32e737a@mail.gmail.com>
	<4BA90072.9060305@mrabarnett.plus.com>
Message-ID: <bc7f680c1003231104i32879481ga3b3b2b16cec373b@mail.gmail.com>

On 3/23/10, MRAB <python at mrabarnett.plus.com> wrote:
> Alex Hall wrote:
>> Hi all, but mainly Tim Golden:
>> Tim, I am using your wonderful message loop for keyboard input, the
>> one on your site that you pointed me to a few months ago. It has been
>> working perfectly as long as I had only one dictionary of keys mapping
>> to one dictionary of functions, but now I want two of each. My program
>> has different modes, which may have varying keystrokes, and I also
>> have some global keystrokes which are the same across all modes, like
>> exiting or switching modes. I cannot figure out how to make the
>> message loop look in two dictionaries at onc. I tried using an if,
>> saying that if action_to_take was not set in the mode-specific
>> dictionary then look at the global dictionary, but it is like it is
>> never looking in the global dictionary at all. I get no syntax errors
>> or problems when running the program, so it has to be something in my
>> logic. Go to
>> http://www.gateway2somewhere.com/sw/main.pyw
>> to see what I mean; the problem code is near the very bottom of the
>> file. Thanks for any suggestions. Oh, please note that I indent one
>> space per indentation level.
>>
> "msg.wParam" gives an int, but the keys of globalFuncs are 'g1', etc,
> not ints.
That did it. I originally used 1-4 like I did for the mode
dictionaries, not realizing that the ints were so important; I figured
they were just keys in the dictionary and that they could be anything,
it was just easier to use ints. Now, I have changed my globals to
20-23 and everything seems to be going well. Thanks!!
> Incidentally, you might want to change:
>
>      if(not action_to_take):
>
> to:
>
>      if action_to_take is None:
>
> in case any of the values happen to be 0 (if not now, then possibly at
> some time in the future).
Sorry, could you explain why you suggested this? I do not follow.
Because of the if statement "if action_to_take:", I figured it was
saying "if action_to_take was successfully set" or something else
having a boolean value. Guess not?
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From pruebauno at latinmail.com  Tue Mar 23 14:09:45 2010
From: pruebauno at latinmail.com (nn)
Date: Tue, 23 Mar 2010 11:09:45 -0700 (PDT)
Subject: Unicode blues in Python3
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
	<mailman.1097.1269367117.23598.python-list@python.org>
Message-ID: <f7baac84-3443-4eae-b348-74d88eea7b83@g4g2000yqa.googlegroups.com>



Rami Chowdhury wrote:
> On Tuesday 23 March 2010 10:33:33 nn wrote:
> > I know that unicode is the way to go in Python 3.1, but it is getting
> > in my way right now in my Unix scripts. How do I write a chr(253) to a
> > file?
> >
> > #nntst2.py
> > import sys,codecs
> > mychar=chr(253)
> > print(sys.stdout.encoding)
> > print(mychar)
>
> The following code works for me:
>
> $ cat nnout5.py
> #!/usr/bin/python3.1
>
> import sys
> mychar = chr(253)
> sys.stdout.write(mychar)
> $ echo $(cat nnout)
> ?
>
> Can I ask why you're using print() in the first place, rather than writing
> directly to a file? Python 3.x, AFAIK, distinguishes between text and binary > files and will let you specify the encoding you want for strings you write.
>
> Hope that helps,
> Rami
> >
> >  > ./nntst2.py
> >
> > ISO8859-1
> > ?
> >
> >  > ./nntst2.py >nnout2
> >
> > Traceback (most recent call last):
> >   File "./nntst2.py", line 5, in <module>
> >     print(mychar)
> > UnicodeEncodeError: 'ascii' codec can't encode character '\xfd' in
> > position 0: ordinal not in range(128)
> >
> > > cat nnout2
> >
> > ascii
> >
> > ..Oh great!
> >
> > ok lets try this:
> > #nntst3.py
> > import sys,codecs
> > mychar=chr(253)
> > print(sys.stdout.encoding)
> > print(mychar.encode('latin1'))
> >
> > > ./nntst3.py
> >
> > ISO8859-1
> > b'\xfd'
> >
> > > ./nntst3.py >nnout3
> > >
> > > cat nnout3
> >
> > ascii
> > b'\xfd'
> >
> > ..Eh... not what I want really.
> >
> > #nntst4.py
> > import sys,codecs
> > mychar=chr(253)
> > print(sys.stdout.encoding)
> > sys.stdout=codecs.getwriter("latin1")(sys.stdout)
> > print(mychar)
> >
> >  > ./nntst4.py
> >
> > ISO8859-1
> > Traceback (most recent call last):
> >   File "./nntst4.py", line 6, in <module>
> >     print(mychar)
> >   File "Python-3.1.2/Lib/codecs.py", line 356, in write
> >     self.stream.write(data)
> > TypeError: must be str, not bytes
> >
> > ..OK, this is not working either.
> >
> > Is there any way to write a value 253 to standard output?
>

#nntst5.py
import sys
mychar=chr(253)
sys.stdout.write(mychar)

> ./nntst5.py >nnout5
Traceback (most recent call last):
  File "./nntst5.py", line 4, in <module>
    sys.stdout.write(mychar)
UnicodeEncodeError: 'ascii' codec can't encode character '\xfd' in
position 0: ordinal not in range(128)

equivalent to print.

I use print so I can do tests and debug runs to the screen or pipe it
to some other tool and then configure the production bash script to
write the final output to a file of my choosing.


From gherron at islandtraining.com  Tue Mar 23 14:11:15 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Tue, 23 Mar 2010 11:11:15 -0700
Subject: Unicode blues in Python3
In-Reply-To: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
Message-ID: <4BA90443.6060307@islandtraining.com>

nn wrote:
> I know that unicode is the way to go in Python 3.1, but it is getting
> in my way right now in my Unix scripts. How do I write a chr(253) to a
> file?
>   

Python3 make a distinction between bytes and string(i.e., unicode) 
types, and you are still thinking in the Python2 mode that does *NOT* 
make such a distinction.  What you appear to want is to write a 
particular byte to a file -- so use the bytes type and a file open in 
binary mode:

 >>> b=bytes([253])
 >>> f = open("abc", 'wb')
 >>> f.write(b)
1
 >>> f.close()

On unix (at least), the "od" program can verify the contents is correct:
 > od abc -d
0000000   253
0000001


Hope that helps.

Gary Herron



> #nntst2.py
> import sys,codecs
> mychar=chr(253)
> print(sys.stdout.encoding)
> print(mychar)
>
>  > ./nntst2.py
> ISO8859-1
> ?
>
>  > ./nntst2.py >nnout2
> Traceback (most recent call last):
>   File "./nntst2.py", line 5, in <module>
>     print(mychar)
> UnicodeEncodeError: 'ascii' codec can't encode character '\xfd' in
> position 0: ordinal not in range(128)
>
>   
>> cat nnout2
>>     
> ascii
>
> ..Oh great!
>
> ok lets try this:
> #nntst3.py
> import sys,codecs
> mychar=chr(253)
> print(sys.stdout.encoding)
> print(mychar.encode('latin1'))
>
>   
>> ./nntst3.py
>>     
> ISO8859-1
> b'\xfd'
>
>   
>> ./nntst3.py >nnout3
>>     
>
>   
>> cat nnout3
>>     
> ascii
> b'\xfd'
>
> ..Eh... not what I want really.
>
> #nntst4.py
> import sys,codecs
> mychar=chr(253)
> print(sys.stdout.encoding)
> sys.stdout=codecs.getwriter("latin1")(sys.stdout)
> print(mychar)
>
>  > ./nntst4.py
> ISO8859-1
> Traceback (most recent call last):
>   File "./nntst4.py", line 6, in <module>
>     print(mychar)
>   File "Python-3.1.2/Lib/codecs.py", line 356, in write
>     self.stream.write(data)
> TypeError: must be str, not bytes
>
> ..OK, this is not working either.
>
> Is there any way to write a value 253 to standard output?
>   




From pruebauno at latinmail.com  Tue Mar 23 14:46:33 2010
From: pruebauno at latinmail.com (nn)
Date: Tue, 23 Mar 2010 11:46:33 -0700 (PDT)
Subject: Unicode blues in Python3
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
	<mailman.1099.1269367884.23598.python-list@python.org>
Message-ID: <3a428b39-bab1-48f2-b7df-560a849b8883@d27g2000yqf.googlegroups.com>



Gary Herron wrote:
> nn wrote:
> > I know that unicode is the way to go in Python 3.1, but it is getting
> > in my way right now in my Unix scripts. How do I write a chr(253) to a
> > file?
> >
>
> Python3 make a distinction between bytes and string(i.e., unicode)
> types, and you are still thinking in the Python2 mode that does *NOT*
> make such a distinction.  What you appear to want is to write a
> particular byte to a file -- so use the bytes type and a file open in
> binary mode:
>
>  >>> b=bytes([253])
>  >>> f = open("abc", 'wb')
>  >>> f.write(b)
> 1
>  >>> f.close()
>
> On unix (at least), the "od" program can verify the contents is correct:
>  > od abc -d
> 0000000   253
> 0000001
>
>
> Hope that helps.
>
> Gary Herron
>
>
>
> > #nntst2.py
> > import sys,codecs
> > mychar=chr(253)
> > print(sys.stdout.encoding)
> > print(mychar)
> >
> >  > ./nntst2.py
> > ISO8859-1
> > ?
> >
> >  > ./nntst2.py >nnout2
> > Traceback (most recent call last):
> >   File "./nntst2.py", line 5, in <module>
> >     print(mychar)
> > UnicodeEncodeError: 'ascii' codec can't encode character '\xfd' in
> > position 0: ordinal not in range(128)
> >
> >
> >> cat nnout2
> >>
> > ascii
> >
> > ..Oh great!
> >
> > ok lets try this:
> > #nntst3.py
> > import sys,codecs
> > mychar=chr(253)
> > print(sys.stdout.encoding)
> > print(mychar.encode('latin1'))
> >
> >
> >> ./nntst3.py
> >>
> > ISO8859-1
> > b'\xfd'
> >
> >
> >> ./nntst3.py >nnout3
> >>
> >
> >
> >> cat nnout3
> >>
> > ascii
> > b'\xfd'
> >
> > ..Eh... not what I want really.
> >
> > #nntst4.py
> > import sys,codecs
> > mychar=chr(253)
> > print(sys.stdout.encoding)
> > sys.stdout=codecs.getwriter("latin1")(sys.stdout)
> > print(mychar)
> >
> >  > ./nntst4.py
> > ISO8859-1
> > Traceback (most recent call last):
> >   File "./nntst4.py", line 6, in <module>
> >     print(mychar)
> >   File "Python-3.1.2/Lib/codecs.py", line 356, in write
> >     self.stream.write(data)
> > TypeError: must be str, not bytes
> >
> > ..OK, this is not working either.
> >
> > Is there any way to write a value 253 to standard output?
> >

Actually what I want is to write a particular byte to standard output,
and I want this to work regardless of where that output gets sent to.
I am aware that I could do
open('nnout','w',encoding='latin1').write(mychar) but I am porting a
python2 program and don't want to rewrite everything that uses that
script.


From iamforufriends at gmail.com  Tue Mar 23 15:21:50 2010
From: iamforufriends at gmail.com (MARRY)
Date: Tue, 23 Mar 2010 12:21:50 -0700 (PDT)
Subject: DRUNK MOM AND BOY... HOT CLIP.....
Message-ID: <1ff5a046-d2c3-40d2-a1f7-7e3b20d30dd2@a37g2000prd.googlegroups.com>

DRUNK MOM AND BOY... HOT CLIP.....

http://123sex4u.blogspot.com/

http://123sex4u.blogspot.com/

http://123sex4u.blogspot.com/

http://123sex4u.blogspot.com/


From python at mrabarnett.plus.com  Tue Mar 23 15:37:51 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 23 Mar 2010 19:37:51 +0000
Subject: using message loop for hotkey capturing
In-Reply-To: <bc7f680c1003231104i32879481ga3b3b2b16cec373b@mail.gmail.com>
References: <bc7f680c1003231001rfeb6f33ve4d04d36d32e737a@mail.gmail.com>	
	<4BA90072.9060305@mrabarnett.plus.com>
	<bc7f680c1003231104i32879481ga3b3b2b16cec373b@mail.gmail.com>
Message-ID: <4BA9188F.407@mrabarnett.plus.com>

Alex Hall wrote:
> On 3/23/10, MRAB <python at mrabarnett.plus.com> wrote:
[snip]
>> Incidentally, you might want to change:
>>
>>      if(not action_to_take):
>>
>> to:
>>
>>      if action_to_take is None:
>>
>> in case any of the values happen to be 0 (if not now, then possibly at
>> some time in the future).
> Sorry, could you explain why you suggested this? I do not follow.
> Because of the if statement "if action_to_take:", I figured it was
> saying "if action_to_take was successfully set" or something else
> having a boolean value. Guess not?
> 
The code:

     globalFuncs.get (msg.wParam)

returns None if the key isn't in the dict.

'if' and 'while' statements treat other objects than just True as True,
in fact anything for which bool() returns True. For example:

     bool(100) returns True
     bool([1, 2, 3]) returns True
     bool('some text') returns True

but:

     bool(0) returns False
     bool([]) returns False
     bool('') returns False
     bool(None) returns False

I also just noticed that you don't give action_to_take a default value
before checking whether it's a hotkey. Suppose that "msg.message ==
win32con.WM_HOTKEY" was False:

   if msg.message == win32con.WM_HOTKEY:
    action_to_take=globalFuncs.get (msg.wParam)
   if(not action_to_take):

It would get to "if(not action_to_take):" and either find that
action_to_take wasn't defined, or use the value from the previous pass
through the loop.


From bahesanhak at gmail.com  Tue Mar 23 15:48:19 2010
From: bahesanhak at gmail.com (=?UTF-8?B?2YXYpNmF2YYg2YXYtdmE2K0=?=)
Date: Tue, 23 Mar 2010 12:48:19 -0700 (PDT)
Subject: Miracles of the devil and beat of the revolution of religious reform
Message-ID: <16ec4cd6-a68d-4ba4-a55f-8d75d93358ca@b7g2000yqd.googlegroups.com>



Follow what god revealed to the Almighty

Peace be upon you

Those who wish to familiarized themselves after you click on the link
please wait a little until it opens the link

Miracles of the devil and beat  of the revolution of religious reform

http://www.ushaaqallah.com/forum/viewtopic.php?f=22&t=19225&sid=49b706e316461bcd768accfb7ccf031c

Peace be upon you


From stefan_ml at behnel.de  Tue Mar 23 15:57:32 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 23 Mar 2010 20:57:32 +0100
Subject: Unicode blues in Python3
In-Reply-To: <3a428b39-bab1-48f2-b7df-560a849b8883@d27g2000yqf.googlegroups.com>
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>	<mailman.1099.1269367884.23598.python-list@python.org>
	<3a428b39-bab1-48f2-b7df-560a849b8883@d27g2000yqf.googlegroups.com>
Message-ID: <hob6fc$o9$1@dough.gmane.org>

nn, 23.03.2010 19:46:
> Actually what I want is to write a particular byte to standard output,
> and I want this to work regardless of where that output gets sent to.
> I am aware that I could do
> open('nnout','w',encoding='latin1').write(mychar) but I am porting a
> python2 program and don't want to rewrite everything that uses that
> script.

Are you writing text or binary data to stdout?

Stefan



From debatem1 at gmail.com  Tue Mar 23 16:04:55 2010
From: debatem1 at gmail.com (geremy condra)
Date: Tue, 23 Mar 2010 16:04:55 -0400
Subject: Python is cool!!
In-Reply-To: <4BA8F56D.6060305@timgolden.me.uk>
References: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
	<4BA8F56D.6060305@timgolden.me.uk>
Message-ID: <f3cc57c61003231304u38f71ee7xd7e52187e310827b@mail.gmail.com>

On Tue, Mar 23, 2010 at 1:07 PM, Tim Golden <mail at timgolden.me.uk> wrote:
> On 23/03/2010 16:55, Jose Manuel wrote:
>>
>> I have been learning Python, and it is amazing .... I am using the
>> tutorial that comes with the official distribution.
>>
>> At the end my goal is to develop applied mathematic in engineering
>> applications to be published on the Web, specially on app. oriented to
>> simulations and control systems, I was about to start learning Java
>> but I found Python which seems easier to learn that Java.
>>
>> Would it be easy to integrate Python in Web pages with HTML? I have
>> read many info on Internet saying it is, and I hope so ....
>
> You probably want to be looking at IronPython and Silverlight.
> In fact, the prolific Michael Foord has already produced an
> example of this, which gives you the Python tutorial online!
>
> ?http://trypython.org
>
> TJG

Granted that I know next to nothing about webwork, but
is there a reason why you recommended a competing,
nonstandard technology rather than simply pointing him
towards more standards compliant tools that exist to do
exactly what he asked for? Seems a bit dodgy to
advocate a closed solution when the alternative has 100%
market share.

Geremy Condra


From mail at timgolden.me.uk  Tue Mar 23 16:12:27 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 23 Mar 2010 20:12:27 +0000
Subject: Python is cool!!
In-Reply-To: <f3cc57c61003231304u38f71ee7xd7e52187e310827b@mail.gmail.com>
References: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>	<4BA8F56D.6060305@timgolden.me.uk>
	<f3cc57c61003231304u38f71ee7xd7e52187e310827b@mail.gmail.com>
Message-ID: <4BA920AB.2070206@timgolden.me.uk>

On 23/03/2010 20:04, geremy condra wrote:
> On Tue, Mar 23, 2010 at 1:07 PM, Tim Golden<mail at timgolden.me.uk>  wrote:
>> On 23/03/2010 16:55, Jose Manuel wrote:
>>> Would it be easy to integrate Python in Web pages with HTML? I have
>>> read many info on Internet saying it is, and I hope so ....
>>
>> You probably want to be looking at IronPython and Silverlight.
>> In fact, the prolific Michael Foord has already produced an
>> example of this, which gives you the Python tutorial online!
>>
>>   http://trypython.org
>>
>> TJG
>
> Granted that I know next to nothing about webwork, but
> is there a reason why you recommended a competing,
> nonstandard technology rather than simply pointing him
> towards more standards compliant tools that exist to do
> exactly what he asked for? Seems a bit dodgy to
> advocate a closed solution when the alternative has 100%
> market share.

I can't say I thought *very* hard before sending that but...
The OP asked for "integrate Python in Web Pages with HTML"
which I understood -- perhaps wrongly -- to mean: run Python
in the browser. The only two ways I'm aware of doing that
in Python are the undersupported Python-as-IE-scripting-language
and IronPython/Silverlight.

Now I look again, I realise that he may have meant simply:
Python as a server-side toolset with possible support for
Javascript. In which case, of course, my answer was not
so applicable.

TJG


From pruebauno at latinmail.com  Tue Mar 23 16:36:20 2010
From: pruebauno at latinmail.com (nn)
Date: Tue, 23 Mar 2010 13:36:20 -0700 (PDT)
Subject: Unicode blues in Python3
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
	<mailman.1099.1269367884.23598.python-list@python.org>
	<3a428b39-bab1-48f2-b7df-560a849b8883@d27g2000yqf.googlegroups.com>
	<mailman.1101.1269374267.23598.python-list@python.org>
Message-ID: <c75d1abb-2674-4c67-9701-38946b5db58f@l25g2000yqd.googlegroups.com>



Stefan Behnel wrote:
> nn, 23.03.2010 19:46:
> > Actually what I want is to write a particular byte to standard output,
> > and I want this to work regardless of where that output gets sent to.
> > I am aware that I could do
> > open('nnout','w',encoding='latin1').write(mychar) but I am porting a
> > python2 program and don't want to rewrite everything that uses that
> > script.
>
> Are you writing text or binary data to stdout?
>
> Stefan

latin1 charset text.


From torriem at gmail.com  Tue Mar 23 16:47:20 2010
From: torriem at gmail.com (Michael Torrie)
Date: Tue, 23 Mar 2010 14:47:20 -0600
Subject: Python is cool!!
In-Reply-To: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
References: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
Message-ID: <4BA928D8.4050903@gmail.com>

Jose Manuel wrote:
> Would it be easy to integrate Python in Web pages with HTML? I have
> read many info on Internet saying it is, and I hope so ....

Django is, among several other similar projects and frameworks, very
popular for generating web apps in Python.  I have only used Django and
it works very well.


From chambon.pascal at wanadoo.fr  Tue Mar 23 16:49:14 2010
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Tue, 23 Mar 2010 21:49:14 +0100
Subject: Castrated traceback in sys.exc_info()
In-Reply-To: <op.u90bjsorx6zn5v@lepton.softlabbsas.com.ar>
References: <7866674b-46ba-49e2-9d76-e8259ba22df0@z3g2000yqz.googlegroups.com>	<20100317124019.7013dfa3@moriz.interne>	<9fd96c3b1003170542t4ea864c6y359107cb747536da@mail.gmail.com>	<op.u9uflwxxx6zn5v@lepton.softlabbsas.com.ar>	<4BA7B4F7.6080404@wanadoo.fr>
	<op.u90bjsorx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <4BA9294A.9090703@wanadoo.fr>

Gabriel Genellina a ?crit :
>
> En Mon, 22 Mar 2010 15:20:39 -0300, Pascal Chambon 
> <chambon.pascal at wanadoo.fr> escribi?:
>>
>> Allright, here is more concretely the problem :
>>
>> ERROR:root:An error
>> Traceback (most recent call last):
>>   File "C:/Users/Pakal/Desktop/aaa.py", line 7, in c
>>     return d()
>>   File "C:/Users/Pakal/Desktop/aaa.py", line 11, in d
>>     def d(): raise ValueError
>> ValueError
>>  >>>
>>
>> As you see, the traceback only starts from function c, which handles 
>> the exception.
>> It doesn't show main(), a() and b(), which might however be (and are, 
>> in my case) critical to diagnose the severity of the problem (since 
>> many different paths would lead to calling c()).
>>
>> So the question is : is that possible to enforce, by a way or 
>> another, the retrieval of the FULL traceback at exception raising 
>> point, instead of that incomplete one ?
>
> Thanks for bringing this topic! I learned a lot trying to understand 
> what happens.
>
> The exception traceback (what sys.exc_info()[2] returns) is *not* a 
> complete stack trace. The sys module documentation is wrong [1] when 
> it says "...encapsulates the call stack at the point where the 
> exception originally occurred."
>
> The Language Reference is more clear [2]: "Traceback objects represent 
> a stack trace of an exception. A traceback object is created when an 
> exception occurs. When the search for an exception handler unwinds the 
> execution stack, at each unwound level a traceback object is inserted 
> in front of the current traceback. When an exception handler is 
> entered, the stack trace is made available to the program."
>
> That is, a traceback holds only the *forward* part of the stack: the 
> frames already exited when looking for an exception handler. Frames 
> going from the program starting point up to the current execution 
> point are *not* included.
>
> Conceptually, it's like having two lists: stack and traceback. The 
> complete stack trace is always stack+traceback. At each step (when 
> unwinding the stack, looking for a frame able to handle the current 
> exception) an item is popped from the top of the stack (last item) and 
> inserted at the head of the traceback.
>
> The traceback holds the "forward" path (from the current execution 
> point, to the frame where the exception was actually raised). It's a 
> linked list, its tb_next attribute holds a reference to the next item; 
> None marks the last one.
>
> The "back" path (going from the current execution point to its caller 
> and all the way to the program entry point) is a linked list of 
> frames; the f_back attribute points to the previous one, or None.
>
> In order to show a complete stack trace, one should combine both. The 
> traceback module contains several useful functions: extract_stack() + 
> extract_tb() are a starting point. The simplest way I could find to 
> make the logging module report a complete stack is to monkey patch 
> logging.Formatter.formatException so it uses format_exception() and 
> format_stack() combined (in fact it is simpler than the current 
> implementation using a StringIO object):
Good point, there is clearly a distinction between "stack trace" and 
"exception traceback" that I didn't know (actually, it seems no one 
makes it in computer literature).

> Good catch, Gabriel.
>
> There should be no need to monkey-patch the logging module - it's
> better if I include the change in the module itself. The only
> remaining question is that of backward compatibility, but I can do
> this for Python 2.7/3.2 only so that won't be an issue. It's probably
> a good idea to log an issue on the bug tracker, though, so we have
> some history for the change - do you want to do that, or shall I?
>
> Regards,
>
> Vinay Sajip
>   
Well having it fixed in logging would be great, but that kind of 
information is good to have in other circumstances, so shouldn't we 
rather advocate the availability of this "stack trace part" in exc_info 
too ?
This way, people like me who consider frames as black magic wouldn't 
need to meet complex stuffs as 
"traceback.format_stack(ei[2].tb_frame.f_back"  :p

Should I open an issue for this evolution of exceptiuon handling, or 
should we content ourselves of this "hacking" of frame stck ?

Regards,
Pascal







From pmaupin at gmail.com  Tue Mar 23 17:24:30 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Tue, 23 Mar 2010 14:24:30 -0700 (PDT)
Subject: Python is cool!!
References: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
	<4BA8F56D.6060305@timgolden.me.uk>
	<f3cc57c61003231304u38f71ee7xd7e52187e310827b@mail.gmail.com> 
	<mailman.1103.1269375152.23598.python-list@python.org>
Message-ID: <62d1f435-e473-4ba5-a7a6-334f5c69e4e3@d37g2000yqn.googlegroups.com>

On Mar 23, 3:12?pm, Tim Golden <m... at timgolden.me.uk> wrote:
> I can't say I thought *very* hard before sending that but...
> The OP asked for "integrate Python in Web Pages with HTML"
> which I understood -- perhaps wrongly -- to mean: run Python
> in the browser. The only two ways I'm aware of doing that
> in Python are the undersupported Python-as-IE-scripting-language
> and IronPython/Silverlight.

If I had to run Python in a browser, the first thing I would do is
turn to Pyjamas:  http://pyjs.org/

Regards,
Pat


From anand.shashwat at gmail.com  Tue Mar 23 17:50:16 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Wed, 24 Mar 2010 03:20:16 +0530
Subject: Python is cool!!
In-Reply-To: <62d1f435-e473-4ba5-a7a6-334f5c69e4e3@d37g2000yqn.googlegroups.com>
References: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
	<4BA8F56D.6060305@timgolden.me.uk>
	<f3cc57c61003231304u38f71ee7xd7e52187e310827b@mail.gmail.com> 
	<mailman.1103.1269375152.23598.python-list@python.org>
	<62d1f435-e473-4ba5-a7a6-334f5c69e4e3@d37g2000yqn.googlegroups.com>
Message-ID: <d4ab53de1003231450r229cc0ej50490393e19acefa@mail.gmail.com>

There is a project PyWhip (renamed as PyKata) which aims for the same
purpose. Google AppEmgine + Django does the trick for that. May be you can
take an inspiration or two from there especially because all code is open
to/for you.

~l0nwlf

On Wed, Mar 24, 2010 at 2:54 AM, Patrick Maupin <pmaupin at gmail.com> wrote:

> On Mar 23, 3:12 pm, Tim Golden <m... at timgolden.me.uk> wrote:
> > I can't say I thought *very* hard before sending that but...
> > The OP asked for "integrate Python in Web Pages with HTML"
> > which I understood -- perhaps wrongly -- to mean: run Python
> > in the browser. The only two ways I'm aware of doing that
> > in Python are the undersupported Python-as-IE-scripting-language
> > and IronPython/Silverlight.
>
> If I had to run Python in a browser, the first thing I would do is
> turn to Pyjamas:  http://pyjs.org/
>
> Regards,
> Pat
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From python at bdurham.com  Tue Mar 23 18:09:36 2010
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 23 Mar 2010 18:09:36 -0400
Subject: Pythonic way to trim and keep leading and trailing whitespace
Message-ID: <1269382176.23636.1366365237@webmail.messagingengine.com>

I'm looking for a pythonic way to trim and keep leading
whitespace in a string.

Use case: I have a bunch of text strings with various amounts of
leading and trailing whitespace (spaces and tabs). I want to grab
the leading and trailing whitespace, save it, surround the
remaining text with html tags, and then add back the leading and
trailing whitespace.

The only solution I can think of is regex, and that makes me
think of the 2 proverbial problems that come with that :)

Is there a 'better' solution than regex for this scenario? (Seems
like this would be a common type of string processing).

Thanks,
Malcolm
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From dpawlows at umich.edu  Tue Mar 23 18:13:36 2010
From: dpawlows at umich.edu (dpawlows)
Date: Tue, 23 Mar 2010 18:13:36 -0400
Subject: Posting to https
Message-ID: <0BAF76CC-8D91-4872-A5F2-EEC9F15C97AF@umich.edu>

I am trying to obtain data on a https site, but everytime I try to  
access the data that is behind the logon screen, I get the logon page  
instead.  I was able to successfully do a test problem:

import sys, urllib2, urllib

zipcode = "48103"
url = 'http://www.wunderground.com/cgi-bin/findweather/getForecast'
data = urllib.urlencode([('query', zipcode)])
req = urllib2.Request(url)
fd = urllib2.urlopen(req, data)
while 1:
     data = fd.read(1024)
     if not len(data):
         break
     sys.stdout.write(data)

which performed as I expected.

However, for the url 'https://secure.umcu.org/cgi-bin/mcw000.cgi?MCWSTART'
with data = ... {'HBUSERNAME':username,'PASSWORD':password}

I was sent just the logon screen. Am I missing something important  
that has to do with interaction with javascript, https, or cgi, or  
something completely different?


Thanks. 
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From pmaupin at gmail.com  Tue Mar 23 18:16:45 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Tue, 23 Mar 2010 17:16:45 -0500
Subject: Python is cool!!
In-Reply-To: <d4ab53de1003231450r229cc0ej50490393e19acefa@mail.gmail.com>
References: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
	<4BA8F56D.6060305@timgolden.me.uk>
	<f3cc57c61003231304u38f71ee7xd7e52187e310827b@mail.gmail.com>
	<mailman.1103.1269375152.23598.python-list@python.org>
	<62d1f435-e473-4ba5-a7a6-334f5c69e4e3@d37g2000yqn.googlegroups.com>
	<d4ab53de1003231450r229cc0ej50490393e19acefa@mail.gmail.com>
Message-ID: <d09829f51003231516r609fb196x22ce7e603ccb65b9@mail.gmail.com>

On Tue, Mar 23, 2010 at 4:50 PM, Shashwat Anand
<anand.shashwat at gmail.com> wrote:
> There is a project PyWhip (renamed as PyKata) which aims for the same
> purpose. Google AppEmgine + Django does the trick for that. May be you can
> take an inspiration or two from there especially because all code is open
> to/for you.

But, if I understand PyWhip/PyKata after glancing at the project page,
it doesn't actually run code in the browser...

Regards,
Pat


From emile at fenx.com  Tue Mar 23 18:34:48 2010
From: emile at fenx.com (Emile van Sebille)
Date: Tue, 23 Mar 2010 15:34:48 -0700
Subject: Pythonic way to trim and keep leading and trailing whitespace
In-Reply-To: <1269382176.23636.1366365237@webmail.messagingengine.com>
References: <1269382176.23636.1366365237@webmail.messagingengine.com>
Message-ID: <hobfpv$4vh$1@dough.gmane.org>

On 3/23/2010 3:09 PM python at bdurham.com said...
> I'm looking for a pythonic way to trim and keep leading
> whitespace in a string.
>
> Use case: I have a bunch of text strings with various amounts of
> leading and trailing whitespace (spaces and tabs). I want to grab
> the leading and trailing whitespace, save it, surround the
> remaining text with html tags, and then add back the leading and
> trailing whitespace.

I'd do it this way:

target = '  	spam and eggs	   '
stripped = target.strip()
replaced = target.replace(stripped,"<html>%s</html>" % stripped)

HTH,

Emile


>
> The only solution I can think of is regex, and that makes me
> think of the 2 proverbial problems that come with that :)
>
> Is there a 'better' solution than regex for this scenario? (Seems
> like this would be a common type of string processing).
>
> Thanks,
> Malcolm
>
>




From daniel.chiquito at gmail.com  Tue Mar 23 18:39:15 2010
From: daniel.chiquito at gmail.com (Daniel Chiquito)
Date: Tue, 23 Mar 2010 18:39:15 -0400
Subject: Pythonic way to trim and keep leading and trailing whitespace
In-Reply-To: <1269382176.23636.1366365237@webmail.messagingengine.com>
References: <1269382176.23636.1366365237@webmail.messagingengine.com>
Message-ID: <9deff17c1003231539kfdef1cfn5fd45e06e330d613@mail.gmail.com>

As far as I know, I don't think there is anything that strips it and returns
the material that was stripped. Regex's would be your best bet.

Daniel

On Tue, Mar 23, 2010 at 6:09 PM, <python at bdurham.com> wrote:

> I'm looking for a pythonic way to trim and keep leading whitespace in a
> string.
>
> Use case: I have a bunch of text strings with various amounts of leading
> and trailing whitespace (spaces and tabs). I want to grab the leading and
> trailing whitespace, save it, surround the remaining text with html tags,
> and then add back the leading and trailing whitespace.
>
> The only solution I can think of is regex, and that makes me think of the 2
> proverbial problems that come with that :)
>
> Is there a 'better' solution than regex for this scenario? (Seems like this
> would be a common type of string processing).
>
> Thanks,
> Malcolm
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


-- 
~
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From martin at v.loewis.de  Tue Mar 23 18:42:47 2010
From: martin at v.loewis.de (Martin v. Loewis)
Date: Tue, 23 Mar 2010 23:42:47 +0100
Subject: Unicode blues in Python3
In-Reply-To: <c75d1abb-2674-4c67-9701-38946b5db58f@l25g2000yqd.googlegroups.com>
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
	<mailman.1099.1269367884.23598.python-list@python.org>
	<3a428b39-bab1-48f2-b7df-560a849b8883@d27g2000yqf.googlegroups.com>
	<mailman.1101.1269374267.23598.python-list@python.org>
	<c75d1abb-2674-4c67-9701-38946b5db58f@l25g2000yqd.googlegroups.com>
Message-ID: <4BA943E7.5000202@v.loewis.de>

nn wrote:
> 
> Stefan Behnel wrote:
>> nn, 23.03.2010 19:46:
>>> Actually what I want is to write a particular byte to standard output,
>>> and I want this to work regardless of where that output gets sent to.
>>> I am aware that I could do
>>> open('nnout','w',encoding='latin1').write(mychar) but I am porting a
>>> python2 program and don't want to rewrite everything that uses that
>>> script.
>> Are you writing text or binary data to stdout?
>>
>> Stefan
> 
> latin1 charset text.

Are you sure about that? If you carefully reconsider, could you come to
the conclusion that you are not writing text at all, but binary data?

If it really was text that you write, why do you need to use
U+00FD (LATIN SMALL LETTER Y WITH ACUTE). To my knowledge, that
character is really infrequently used in practice. So that you try to
write it strongly suggests that it is not actually text what you are
writing.

Also, your formulation suggests the same:

"Is there any way to write a value 253 to standard output?"

If you would really be writing text, you'd ask


"Is there any way to write '?' to standard output?"

Regards,
Martin


From vinay_sajip at yahoo.co.uk  Tue Mar 23 18:43:40 2010
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Tue, 23 Mar 2010 15:43:40 -0700 (PDT)
Subject: Castrated traceback in sys.exc_info()
References: <7866674b-46ba-49e2-9d76-e8259ba22df0@z3g2000yqz.googlegroups.com>
	<20100317124019.7013dfa3@moriz.interne>
	<9fd96c3b1003170542t4ea864c6y359107cb747536da@mail.gmail.com> 
	<op.u9uflwxxx6zn5v@lepton.softlabbsas.com.ar>
	<4BA7B4F7.6080404@wanadoo.fr> 
	<op.u90bjsorx6zn5v@lepton.softlabbsas.com.ar>
	<mailman.1105.1269377396.23598.python-list@python.org>
Message-ID: <0301d0b5-5d5d-436f-a342-16fe81b340d7@t41g2000yqt.googlegroups.com>

On Mar 23, 8:49?pm, Pascal Chambon <chambon.pas... at wanadoo.fr> wrote:
>
> Should I open an issue for this evolution of exceptiuon handling, or
> should we content ourselves of this "hacking" of frame stck ?
>

Possibly worth raising an issue (not logging-related), but perhaps
it's worth seeing if this has come up before creating the issue.

Regards,

Vinay Sajip


From python at bdurham.com  Tue Mar 23 18:45:36 2010
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 23 Mar 2010 18:45:36 -0400
Subject: Pythonic way to trim and keep leading and trailing whitespace
In-Reply-To: <hobfpv$4vh$1@dough.gmane.org>
References: <1269382176.23636.1366365237@webmail.messagingengine.com>
	<hobfpv$4vh$1@dough.gmane.org>
Message-ID: <1269384336.29264.1366374513@webmail.messagingengine.com>

Emile,

> target = '  	spam and eggs	   '
> stripped = target.strip()
> replaced = target.replace(stripped,"<html>%s</html>" % stripped)

Brilliant! That's just the type of clever solution I was looking for.

Thank you!

Malcolm



----- Original message -----
From: "Emile van Sebille" <emile at fenx.com>
To: python-list at python.org
Date: Tue, 23 Mar 2010 15:34:48 -0700
Subject: Re: Pythonic way to trim and keep leading and trailing
whitespace

On 3/23/2010 3:09 PM python at bdurham.com said...
> I'm looking for a pythonic way to trim and keep leading
> whitespace in a string.
>
> Use case: I have a bunch of text strings with various amounts of
> leading and trailing whitespace (spaces and tabs). I want to grab
> the leading and trailing whitespace, save it, surround the
> remaining text with html tags, and then add back the leading and
> trailing whitespace.

I'd do it this way:

target = '      spam and eggs      '
stripped = target.strip()
replaced = target.replace(stripped,"<html>%s</html>" % stripped)

HTH,

Emile


>
> The only solution I can think of is regex, and that makes me
> think of the 2 proverbial problems that come with that :)
>
> Is there a 'better' solution than regex for this scenario? (Seems
> like this would be a common type of string processing).
>
> Thanks,
> Malcolm
>
>


-- 
http://mail.python.org/mailman/listinfo/python-list



From anand.shashwat at gmail.com  Tue Mar 23 18:50:25 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Wed, 24 Mar 2010 04:20:25 +0530
Subject: Pythonic way to trim and keep leading and trailing whitespace
In-Reply-To: <9deff17c1003231539kfdef1cfn5fd45e06e330d613@mail.gmail.com>
References: <1269382176.23636.1366365237@webmail.messagingengine.com> 
	<9deff17c1003231539kfdef1cfn5fd45e06e330d613@mail.gmail.com>
Message-ID: <d4ab53de1003231550j6bc6bebbh8693445ceba0a087@mail.gmail.com>

regex is not goto that you should always avoid using it. It have its own
use-case, here regex solution is intuitive although @emile have done this
for you via string manpulation.

On Wed, Mar 24, 2010 at 4:09 AM, Daniel Chiquito
<daniel.chiquito at gmail.com>wrote:

> As far as I know, I don't think there is anything that strips it and
> returns the material that was stripped. Regex's would be your best bet.
>
> Daniel
>
> On Tue, Mar 23, 2010 at 6:09 PM, <python at bdurham.com> wrote:
>
>> I'm looking for a pythonic way to trim and keep leading whitespace in a
>> string.
>>
>> Use case: I have a bunch of text strings with various amounts of leading
>> and trailing whitespace (spaces and tabs). I want to grab the leading and
>> trailing whitespace, save it, surround the remaining text with html tags,
>> and then add back the leading and trailing whitespace.
>>
>> The only solution I can think of is regex, and that makes me think of the
>> 2 proverbial problems that come with that :)
>>
>> Is there a 'better' solution than regex for this scenario? (Seems like
>> this would be a common type of string processing).
>>
>> Thanks,
>> Malcolm
>>
>>
>>
>> --
>>
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>
>
> --
> ~
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From python.list at tim.thechases.com  Tue Mar 23 19:38:10 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 23 Mar 2010 18:38:10 -0500
Subject: Pythonic way to trim and keep leading and trailing whitespace
In-Reply-To: <1269382176.23636.1366365237@webmail.messagingengine.com>
References: <1269382176.23636.1366365237@webmail.messagingengine.com>
Message-ID: <4BA950E2.4020708@tim.thechases.com>

python at bdurham.com wrote:
> I'm looking for a pythonic way to trim and keep leading
> whitespace in a string.
> 
> Use case: I have a bunch of text strings with various amounts of
> leading and trailing whitespace (spaces and tabs). I want to grab
> the leading and trailing whitespace, save it, surround the
> remaining text with html tags, and then add back the leading and
> trailing whitespace.
> 
> The only solution I can think of is regex, and that makes me
> think of the 2 proverbial problems that come with that :)

Just in case you're okay with a regexp solution, you can use

   >>> s = "\t\tabc def   "
   >>> import re
   >>> r = re.compile(r'^(\s*)(.*?)(\s*)$')
   >>> m = re.match(s)
   >>> m.groups()
   ('\t\t', 'abc def', '   ')
   >>> leading, text, trailing = m.groups()

While Emile's solution works nicely for your particular use-case, 
in the event you need to discern between leading/trailing 
whitespace, the above makes it pretty easy.

-tkc





From martin.hellwig at dcuktec.org  Tue Mar 23 19:57:23 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Tue, 23 Mar 2010 23:57:23 +0000
Subject: Pythonic way to trim and keep leading and trailing whitespace
In-Reply-To: <mailman.1114.1269387500.23598.python-list@python.org>
References: <1269382176.23636.1366365237@webmail.messagingengine.com>
	<mailman.1114.1269387500.23598.python-list@python.org>
Message-ID: <hobkgu$ibs$1@news.eternal-september.org>

On 03/23/10 23:38, Tim Chase wrote:
<cut>
> Just in case you're okay with a regexp solution, you can use
>
>  >>> s = "\t\tabc def "
>  >>> import re
>  >>> r = re.compile(r'^(\s*)(.*?)(\s*)$')
>  >>> m = re.match(s)
>  >>> m.groups()
> ('\t\t', 'abc def', ' ')
>  >>> leading, text, trailing = m.groups()
<cut>
Ahhh regex, the hammer, Swiss Army Knife, cable tie, duct tape, 
superglue and soldering iron, all wrapped in one*. Mastery of it will 
enable you to drive the nails in your coffin at an incomparable speed. :-)

*Yes I was a sysadmin, why do you ask?
-- 
mph


From nilly16 at yahoo.com  Tue Mar 23 20:05:09 2010
From: nilly16 at yahoo.com (Jimbo)
Date: Tue, 23 Mar 2010 17:05:09 -0700 (PDT)
Subject: Advice Criticism on Python App
Message-ID: <de18cb49-b0fd-4862-b9af-3743720e0db6@u19g2000prh.googlegroups.com>

I have made a Python App(really script) that will check a stocks
current values from a website & save that data to a SQLite 3 database.

I am looking for any suggestions & criticisms on what I should do
better or anything at all but mainly in these areas:
[QUOTE]
- Correct Python Layout of code
- Correct error checking: Am I catching all my errors or are my
exceptions not specific enough? Should I be using more try excepts
inside my functions?
- Are there any areas where huge errors, bugs etc could occur that I
have not compensated for?
- I am also looking for suggestions on how to write a function better,
so if you think that function is really bad & should be rewritten
completely or something I would really like to hear it.
- Anything else that you see
- Is python meant to be used in the way I have used it? To make a
'semi detailed' app?[/QUOTE]

Any advice criticism would be really helpful.

App:
[CODE]"""
 *Stock Data Builder*
   Algorithm:
      - Search website for stock
      - Get website HTML source code
      - Search code for target stock data(price,dividends,etc..)
      - Add data to text file
"""

import sys
import os
import sqlite3
import datetime
import time
import urllib2

### Global Variables ###
menu = "***Stock Program*** \n\n1. Add a Stock to track \n2. Get
Todays Tracking Data \n3. Exit \nEnter decision: "
target = '<th scope="row" class="row"><a href="/asx/research/
companyInfo.do?by=asxCode&asxCode=%s">%s</a>'
ASXurl = 'http://www.asx.com.au/asx/markets/priceLookup.do?
by=asxCodes&asxCodes='

class stock:
    code             = ""
    purchasePrice    = 0
    purchaseQuantity = 0
    price            = []  # list of recent prices
    recentBid        = []  # list of recent bids for stock
    recentOffer      = []  # list of recent offers for stock
    stockVol         = []  # list of stock quantity available on
market
    def __init__(self):
        """ Default Constructor """
        self.code             = ""
        self.purchasePrice    = 0
        self.purchaseQuantity = 0

    def constructor(self, stockCode, purPrice, purQuant):
        """ Constructor """
        self.code             = stockCode
        self.purchasePrice    = purPrice
        self.purchaseQuantity = purQuant

    def setData(self, stockCode, purPrice, purQuant, priceList,
reBidList, reOffList, popList):
        """ Defines & implements the objects' public variables """
        self.code             = stockCode
        self.purchasePrice    = purPrice
        self.purchaseQuantity = purQuant
        self.price            = priceList
        self.recentBid        = reBidList
        self.recentOffer      = reOffList
        self.stockVol         = popList

        self.printStats()

    def updateData(self, priceEle, bidEle, offerEle, populEle):
        """ Adds data to stock object's lists """
        self.price.append(priceEle)
        self.recentBid.append(bidEle)
        self.recentOffer.append(offerEle)
        self.stockVol.append(populEle)

    def printStats(self):
        """ Output Stock attributes """

        print("Stock Code: "+self.code)
        print("Stock Purchase Price: "+str(self.purchasePrice))
        print("Stock Quantity Owned: "+str(self.purchaseQuantity))
        print("***Initial Investment Value:
"+str(self.purchasePrice*self.purchaseQuantity))
        if not(len(self.price) <= 0):
            print("Stock Current Price: "+str(self.price[-1]))
            print("Recent Bid: "+str(self.recentBid[-1]))
            print("Recent Offer: "+str(self.recentOffer[-1]))
            print("Total Stock Volume in market:
"+str(self.stockVol[-1]))
            print("***Present Investment Value:
"+str(self.price[-1]*self.purchaseQuantity))
        print("\n")


### Functions ###
def connectDatabase(dbLocation, dbName, tableName):
    """ Establish & Return connection to SQLite Database """

    try:
        if not (os.path.exists(dbLocation)):
            os.mkdir(dbLocation) # create folder/dir

        os.chdir(dbLocation)        # change directory focus to
dbLocation
        conn = sqlite3.connect(dbLocation+dbName)
        cur = conn.cursor()
        try:
            createTableQ = "CREATE TABLE IF NOT EXISTS "+tableName
+" (code varchar PRIMARY KEY, purchase_price float, purchase_quantity
float, purchase_date varchar);"
            cur.execute(createTableQ)
            conn.commit()
        except:
            pass
        return conn
    except IOError or OSError:
        print "Connection to database failed"
        return False

def retrieveStockDatabase(conn, tableName):
    """ Read SQLite3 database & extract stock data into StockList """

    stockList  = []
    stockQuery = "select recent_price, recent_offer, recent_bid,
stock_volume from ? ;"
    cur = conn.cursor()
    cur.execute("select code, purchase_price, purchase_quantity from
"+tableName+";")

    for row in cur.fetchall():
        newStock = stock()
        newStock.code             = row[0]
        newStock.purchasePrice    = row[1]
        newStock.purchaseQuantity = row[2]
        cur.execute(stockQuery,[newStock.code])
        for rw in cur.fetchall():
            newStock.price.append(rw[0])
            newStock.recentOffer.append(rw[1])
            newStock.recentBid.append(rw[2])
            newStock.stockVol.append(rw[3])
        stockList.append(newStock)

    return stockList

def getDate():
    """ Return todays date in format DD:MM:YYYY """
    time = datetime.datetime.now()
    date = time.strftime("%d:%m:%Y") # string format time (%y)
    return date

def newStockDatabase(conn, stockTable, stock):
    """ Add a new stock to SQLite database if not already there
        We save the stocks code, purchase price, quantity purchased
        & date of purchase.                                       """
    cur = conn.cursor()
    try:
        createTableQ = "create table "+stock.code+" (date varchar
PRIMARY KEY, recent_price float, recent_offer float, recent_bid float,
stock_volume double);"
        stockQuery   = "insert into "+stockTable+"
values(?, ?, ?, ?);"
        cur.execute(createTableQ)
        cur.execute(stockQuery,
[stock.code,stock.purchasePrice,stock.purchaseQuant,getDate()])
        conn.commit()
    except IOError or OSError:
        print "Table may already exist or bad SQLite connection."
        return False

def webFormat(URL):

    if (URL.startswith("http://")==False):
        URL = "http://"+URL

    return URL

def getSource(URL):
    """ Retrieve HTML source code from website URL &
        save in sourceBuffer                       """

    try:
        URL = webFormat(URL) # make sure URL contains essential
"http://"
        sourceBuffer = urllib2.urlopen(URL)
        print '\nResponse code = ',sourceBuffer.code
        print 'Response headers = ',sourceBuffer.info()
        print 'Actual URL = ',sourceBuffer.geturl()
        sourceCode = sourceBuffer.read()
        sourceBuffer.close()
        return sourceCode

    except IOError:  # URLError
        print "Function Failed: Reasons could be invalid URL name \nOR
\nHTML protocol message transfer failure."
        return False # function failed

def getTargetText(targetStrtData, targetEndData, dataBuffer):
    """ Grabs target text that lies inside 'dataBuffer' string
        between targetStrtData & targetEndData                """

    try:
        result = dataBuffer.split(targetStrtData)
        result.pop(0)
        result = result[0].split(targetEndData)
        result.pop(1)
        print result
        return result
    except IOError:
        print "Function Failed: Reasons could be targetStrtData and/or
targetEndData is not present in dataBuffer."

def getStockData(htmlText, selectedStock):
    """ Extract stock data(stock code,price,etc) from htmlText """
    try:
        # Here I extract my number data from HTML text
        tempList = []
        for string in htmlText:
            for i in string.split('>'):
                for e in i.split():
                        if ('.' in e and e[0].isdigit()):
                            tempList.append(float(e))
                        elif (',' in e and e[0].isdigit() ):
                            # remove ',' chars
                            e = e.replace(',','')
                            tempList.append(float(e))

 
selectedStock.updateData(tempList[0],tempList[2],tempList[3],tempList[7])

    except IOError:  # is this the correct error I should be trying to
catch here??
        print "Function Failed: Reasons could be: sites HTML data has
changed. Consult author of program."
        return False

def createStockTracker(stockCode,stockPrice,stockQuant, stockList):
    """ Add a new stock to the database to track """
    newStock = stock()
    newStock.constructor(stockCode,stockPrice,stockQuant)
    stockList.append(newStock)
    return stockList

def writeStockToDatabase(conn, stock):
    """ Write ONLY this Stock's attributes to SQLite Database """

    cur = conn.cursor()
    date = getDate()

    tableName = stock.code
    stockquery = "insert into "+tableName+" values(?, ?, ?, ?, ?);"
    cur.execute(query,[date,stock.price[-1], stock.recentOffer[-1],
stock.recentBid[-1], stock.stockVol[-1]])
    conn.commit()

def writeAllToDatabase(conn, stockList):
    """ Enter recent Stock attributes into SQLite Database """

    cur = conn.cursor()
    date = getDate()

    for stock in stockList:
        tableName = stock.code
        stockquery = "insert into "+tableName+"
values(?, ?, ?, ?, ?);"
        cur.execute(query,[date,stock.price[-1],
stock.recentOffer[-1], stock.recentBid[-1], stock.stockVol[-1]])
        conn.commit()

### Input Functions ###
def inputNewStock():
    """ """
    print "*Please note only an Australian Securities Exchange(ASX)
listed stock can be tracked in Version 1.0."
    badInput = True

    while (badInput == True):
        try:
            code     = raw_input("Please enter the ASX code for the
stock you wish to track: ")
            price    = input("Please enter the individual stock value
for "+code+": ")
            quantity = input("Please enter the number/quantity of
stocks purchased: ")
            if (len(code)>3):
                badInput = True
            else : badInput = False
            return True
        except IOError:
            if (raw_input("Incorrect input. Note: ASX code cannot be
more than 3 chars. Press 'x' to exit or anything else to try
again")=='x'):
                return False
        badInput = True # this I am not sure if necessary to loop
correctly


### Main program loop ###
def main():
    programEnd = False;
    dbLocation = "C:\Users\Sam\Desktop\StockApp/"
    dbName     = "stockData.db"
    stockTable = "stocks"

    conn = connectDatabase(dbLocation,dbName,stockTable)
    stockList = retrieveStockDatabase(conn,stockTable)

    for s in stockList:
        s.printStats()

    while (programEnd == False):

        decision = input(menu) # Print Menu

        if (decision==1):

            if not(inputNewStock()==False):
                stockList =
createStockTracker(acode,price,quantity,stockList)
                newStockDatabase(conn,stockTable,stockList[-1])
                print("\n** New Stock **")
                stockList[-1].printStats()
                print "The stock "+code+" was successfully added to
our database. \nNow every time the program runs it will automatically
track this stock & obtain its stock attributes\n\n"
                # TO DO:
                # get new stock recent Data from internet etc.
                # add stock data to data base;
        elif (decision==2):
            if (len(stockList)>0):
                for Stock in stockList:
                    URL = ASXurl+Stock.code
                    sourceCode = getSource(URL)
                    targetData = getTargetText(target %
(Stock.code,Stock.code),"</tr>",sourceCode)
                    getStockData(targetData,Stock)
                    Stock.printStats()
                    #writeStockToDatabase(conn,Stock)
            else:
                print "You must first identify a stock to follow.
\nPlease select option 1."
        elif (decision==3):
            print "Thank you for using Stock Program. Goodbye.\n"
            programEnd = True; # Exit program

    conn.close()
    return 0 # End program

main()[/CODE]


From clp2 at rebertia.com  Tue Mar 23 21:32:11 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 23 Mar 2010 18:32:11 -0700
Subject: Advice Criticism on Python App
In-Reply-To: <de18cb49-b0fd-4862-b9af-3743720e0db6@u19g2000prh.googlegroups.com>
References: <de18cb49-b0fd-4862-b9af-3743720e0db6@u19g2000prh.googlegroups.com>
Message-ID: <50697b2c1003231832i280655adu9c52ee45f9c1de15@mail.gmail.com>

On Tue, Mar 23, 2010 at 5:05 PM, Jimbo <nilly16 at yahoo.com> wrote:
> I have made a Python App(really script) that will check a stocks
> current values from a website & save that data to a SQLite 3 database.
>
> I am looking for any suggestions & criticisms on what I should do
> better or anything at all but mainly in these areas:
<snip>
> Any advice criticism would be really helpful.

Complying with Python naming conventions would be one place to start:
* Class names should be in StudlyCaps (so class "Stock", not class "stock").
* Constants should be in UPPERCASE_WITH_UNDERSCORES.
* Most other names should be words_separated_by_underscores, not
camelCaseLikeThis; FWIW, I'm not a fan of this part of the guideline
personally.

Also, conditions don't need parentheses around them. So:
if (decision == 1): #WRONG! harder to read, extra syntactic noise
if decision == 1: #RIGHT

For many more style details, see PEP 8 -- Style Guide for Python Code:
http://www.python.org/dev/peps/pep-0008/

Additionally, the "return 0" in main() serves no purpose; the return
value isn't used as the exit code for the program. You can either
eliminate the line entirely or use plain "return" if you want the
extra clarity.

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


From python at mrabarnett.plus.com  Tue Mar 23 21:36:31 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 24 Mar 2010 01:36:31 +0000
Subject: Advice Criticism on Python App
In-Reply-To: <de18cb49-b0fd-4862-b9af-3743720e0db6@u19g2000prh.googlegroups.com>
References: <de18cb49-b0fd-4862-b9af-3743720e0db6@u19g2000prh.googlegroups.com>
Message-ID: <4BA96C9F.9080301@mrabarnett.plus.com>

Jimbo wrote:
> I have made a Python App(really script) that will check a stocks
> current values from a website & save that data to a SQLite 3 database.
> 
> I am looking for any suggestions & criticisms on what I should do
> better or anything at all but mainly in these areas:
> [QUOTE]
> - Correct Python Layout of code
> - Correct error checking: Am I catching all my errors or are my
> exceptions not specific enough? Should I be using more try excepts
> inside my functions?
> - Are there any areas where huge errors, bugs etc could occur that I
> have not compensated for?
> - I am also looking for suggestions on how to write a function better,
> so if you think that function is really bad & should be rewritten
> completely or something I would really like to hear it.
> - Anything else that you see
> - Is python meant to be used in the way I have used it? To make a
> 'semi detailed' app?[/QUOTE]
> 
> Any advice criticism would be really helpful.
> 
> App:
> [CODE]"""
>  *Stock Data Builder*
>    Algorithm:
>       - Search website for stock
>       - Get website HTML source code
>       - Search code for target stock data(price,dividends,etc..)
>       - Add data to text file
> """
> 
> import sys
> import os
> import sqlite3
> import datetime
> import time
> import urllib2
> 
> ### Global Variables ###
> menu = "***Stock Program*** \n\n1. Add a Stock to track \n2. Get
> Todays Tracking Data \n3. Exit \nEnter decision: "
> target = '<th scope="row" class="row"><a href="/asx/research/
> companyInfo.do?by=asxCode&asxCode=%s">%s</a>'
> ASXurl = 'http://www.asx.com.au/asx/markets/priceLookup.do?
> by=asxCodes&asxCodes='
> 
> class stock:
>     code             = ""
>     purchasePrice    = 0
>     purchaseQuantity = 0
>     price            = []  # list of recent prices
>     recentBid        = []  # list of recent bids for stock
>     recentOffer      = []  # list of recent offers for stock
>     stockVol         = []  # list of stock quantity available on
> market

This will be variables belonging to the class itself, not instances of
it.

>     def __init__(self):
>         """ Default Constructor """
>         self.code             = ""
>         self.purchasePrice    = 0
>         self.purchaseQuantity = 0
> 
>     def constructor(self, stockCode, purPrice, purQuant):
>         """ Constructor """
>         self.code             = stockCode
>         self.purchasePrice    = purPrice
>         self.purchaseQuantity = purQuant
> 
>     def setData(self, stockCode, purPrice, purQuant, priceList,
> reBidList, reOffList, popList):
>         """ Defines & implements the objects' public variables """
>         self.code             = stockCode
>         self.purchasePrice    = purPrice
>         self.purchaseQuantity = purQuant
>         self.price            = priceList
>         self.recentBid        = reBidList
>         self.recentOffer      = reOffList
>         self.stockVol         = popList
> 
>         self.printStats()
> 
>     def updateData(self, priceEle, bidEle, offerEle, populEle):
>         """ Adds data to stock object's lists """
>         self.price.append(priceEle)
>         self.recentBid.append(bidEle)
>         self.recentOffer.append(offerEle)
>         self.stockVol.append(populEle)
> 
>     def printStats(self):
>         """ Output Stock attributes """
> 
>         print("Stock Code: "+self.code)

In Python 2 'print' is a statement, so it doesn't need its arguments to
be enclosed in (). You could also use Python's string formatting:

         print "Stock Code: %s" % self.code

>         print("Stock Purchase Price: "+str(self.purchasePrice))
>         print("Stock Quantity Owned: "+str(self.purchaseQuantity))
>         print("***Initial Investment Value:
> "+str(self.purchasePrice*self.purchaseQuantity))
>         if not(len(self.price) <= 0):

'not' has a lower priority than '<=', and this can be simplified anyway:

         if len(self.price) > 0:

or even:

         if self.price:

because empty containers (eg lists) are treated as False, non-empty ones
as True, by 'if' and 'while' statements.

>             print("Stock Current Price: "+str(self.price[-1]))
>             print("Recent Bid: "+str(self.recentBid[-1]))
>             print("Recent Offer: "+str(self.recentOffer[-1]))
>             print("Total Stock Volume in market:
> "+str(self.stockVol[-1]))
>             print("***Present Investment Value:
> "+str(self.price[-1]*self.purchaseQuantity))
>         print("\n")
> 
> 
> ### Functions ###
> def connectDatabase(dbLocation, dbName, tableName):
>     """ Establish & Return connection to SQLite Database """
> 
>     try:
>         if not (os.path.exists(dbLocation)):
>             os.mkdir(dbLocation) # create folder/dir
> 
>         os.chdir(dbLocation)        # change directory focus to
> dbLocation

It's normally easier to use absolute paths instead of changing the
current directory.

>         conn = sqlite3.connect(dbLocation+dbName)

It's better to join paths using os.path.join() because that will insert
any directory separators for you.

>         cur = conn.cursor()
>         try:
>             createTableQ = "CREATE TABLE IF NOT EXISTS "+tableName
> +" (code varchar PRIMARY KEY, purchase_price float, purchase_quantity
> float, purchase_date varchar);"
>             cur.execute(createTableQ)
>             conn.commit()
>         except:
>             pass

DON'T USE BARE EXCEPTS, especially if you're just going to ignore the
exception. Exceptions can be raised for a variety of reasons, including
one you didn't expect due to bugs, so catch only what you expect.

>         return conn
>     except IOError or OSError:

The result of:

     IOError or OSError

is:

     IOError

What you want is:

     except (IOError, OSError):

Note: the parentheses are necessary here, otherwise it it would mean
"catch an IOError exception and then bind it to the name 'OSError'".

>         print "Connection to database failed"
>         return False
> 
Some times you return the connection, and other times False. A more
usual value than False in such cases is None (unless you're returning
True or False).

> def retrieveStockDatabase(conn, tableName):
>     """ Read SQLite3 database & extract stock data into StockList """
> 
>     stockList  = []
>     stockQuery = "select recent_price, recent_offer, recent_bid,
> stock_volume from ? ;"
>     cur = conn.cursor()
>     cur.execute("select code, purchase_price, purchase_quantity from
> "+tableName+";")
> 
>     for row in cur.fetchall():
>         newStock = stock()
>         newStock.code             = row[0]
>         newStock.purchasePrice    = row[1]
>         newStock.purchaseQuantity = row[2]
>         cur.execute(stockQuery,[newStock.code])
>         for rw in cur.fetchall():
>             newStock.price.append(rw[0])
>             newStock.recentOffer.append(rw[1])
>             newStock.recentBid.append(rw[2])
>             newStock.stockVol.append(rw[3])
>         stockList.append(newStock)
> 
>     return stockList
> 
> def getDate():
>     """ Return todays date in format DD:MM:YYYY """
>     time = datetime.datetime.now()
>     date = time.strftime("%d:%m:%Y") # string format time (%y)
>     return date
> 
> def newStockDatabase(conn, stockTable, stock):
>     """ Add a new stock to SQLite database if not already there
>         We save the stocks code, purchase price, quantity purchased
>         & date of purchase.                                       """
>     cur = conn.cursor()
>     try:
>         createTableQ = "create table "+stock.code+" (date varchar
> PRIMARY KEY, recent_price float, recent_offer float, recent_bid float,
> stock_volume double);"
>         stockQuery   = "insert into "+stockTable+"
> values(?, ?, ?, ?);"
>         cur.execute(createTableQ)
>         cur.execute(stockQuery,
> [stock.code,stock.purchasePrice,stock.purchaseQuant,getDate()])
>         conn.commit()
>     except IOError or OSError:
>         print "Table may already exist or bad SQLite connection."
>         return False
> 
> def webFormat(URL):
> 
>     if (URL.startswith("http://")==False):
>         URL = "http://"+URL
> 
Better as:

     if not URL.startswith("http://"):

The conditions of 'if' and 'while' statements don't need to enclosed in
parentheses like in C, Java, etc.

>     return URL
> 
> def getSource(URL):
>     """ Retrieve HTML source code from website URL &
>         save in sourceBuffer                       """
> 
>     try:
>         URL = webFormat(URL) # make sure URL contains essential
> "http://"
>         sourceBuffer = urllib2.urlopen(URL)
>         print '\nResponse code = ',sourceBuffer.code
>         print 'Response headers = ',sourceBuffer.info()
>         print 'Actual URL = ',sourceBuffer.geturl()
>         sourceCode = sourceBuffer.read()
>         sourceBuffer.close()
>         return sourceCode
> 
>     except IOError:  # URLError
>         print "Function Failed: Reasons could be invalid URL name \nOR
> \nHTML protocol message transfer failure."
>         return False # function failed
> 
> def getTargetText(targetStrtData, targetEndData, dataBuffer):
>     """ Grabs target text that lies inside 'dataBuffer' string
>         between targetStrtData & targetEndData                """
> 
>     try:
>         result = dataBuffer.split(targetStrtData)
>         result.pop(0)
>         result = result[0].split(targetEndData)
>         result.pop(1)
>         print result
>         return result
>     except IOError:
>         print "Function Failed: Reasons could be targetStrtData and/or
> targetEndData is not present in dataBuffer."
> 
You haven't given a return statement for when there's an error, so it'll
return None. It's probably clearer if you write a function in Python
either as a _function_ which _always_ returns a value or as a
_procedure_ which _never_ returns a value.

In Python the preference is for a function to raise an exception to
indicate an error instead of returning a flag.

> def getStockData(htmlText, selectedStock):
>     """ Extract stock data(stock code,price,etc) from htmlText """
>     try:
>         # Here I extract my number data from HTML text
>         tempList = []
>         for string in htmlText:
>             for i in string.split('>'):
>                 for e in i.split():
>                         if ('.' in e and e[0].isdigit()):
>                             tempList.append(float(e))
>                         elif (',' in e and e[0].isdigit() ):
>                             # remove ',' chars
>                             e = e.replace(',','')
>                             tempList.append(float(e))
> 
>  
> selectedStock.updateData(tempList[0],tempList[2],tempList[3],tempList[7])
> 
>     except IOError:  # is this the correct error I should be trying to
> catch here??
>         print "Function Failed: Reasons could be: sites HTML data has
> changed. Consult author of program."
>         return False
> 
> def createStockTracker(stockCode,stockPrice,stockQuant, stockList):
>     """ Add a new stock to the database to track """
>     newStock = stock()
>     newStock.constructor(stockCode,stockPrice,stockQuant)
>     stockList.append(newStock)
>     return stockList
> 
> def writeStockToDatabase(conn, stock):
>     """ Write ONLY this Stock's attributes to SQLite Database """
> 
>     cur = conn.cursor()
>     date = getDate()
> 
>     tableName = stock.code
>     stockquery = "insert into "+tableName+" values(?, ?, ?, ?, ?);"
>     cur.execute(query,[date,stock.price[-1], stock.recentOffer[-1],
> stock.recentBid[-1], stock.stockVol[-1]])
>     conn.commit()
> 
> def writeAllToDatabase(conn, stockList):
>     """ Enter recent Stock attributes into SQLite Database """
> 
>     cur = conn.cursor()
>     date = getDate()
> 
>     for stock in stockList:
>         tableName = stock.code
>         stockquery = "insert into "+tableName+"
> values(?, ?, ?, ?, ?);"
>         cur.execute(query,[date,stock.price[-1],
> stock.recentOffer[-1], stock.recentBid[-1], stock.stockVol[-1]])
>         conn.commit()
> 
> ### Input Functions ###
> def inputNewStock():
>     """ """
>     print "*Please note only an Australian Securities Exchange(ASX)
> listed stock can be tracked in Version 1.0."
>     badInput = True
> 
>     while (badInput == True):

Better as:

     while badInput:

>         try:
>             code     = raw_input("Please enter the ASX code for the
> stock you wish to track: ")

If you assign to a name in a function then that name will be treated as
a local name (variable) unless you say it's global in the function,
therefore 'code', etc, won't been seen outside this function.

>             price    = input("Please enter the individual stock value
> for "+code+": ")
>             quantity = input("Please enter the number/quantity of
> stocks purchased: ")
>             if (len(code)>3):
>                 badInput = True
>             else : badInput = False
>             return True

This will check the length, setting badInput accordingly, and then
return True.

>         except IOError:

I don't see anything in the 'try' block that will raise IOError.

>             if (raw_input("Incorrect input. Note: ASX code cannot be
> more than 3 chars. Press 'x' to exit or anything else to try
> again")=='x'):
>                 return False
>         badInput = True # this I am not sure if necessary to loop
> correctly
> 
You're not explicitly returning anything from the function when the loop
exits, so it would return None.

> 
> ### Main program loop ###
> def main():
>     programEnd = False;
>     dbLocation = "C:\Users\Sam\Desktop\StockApp/"

If your string contains literal backslashes then use raw strings
instead. Raw strings can end in a backslash, but that shouldn't matter
in the script if you're joining paths together using os.path.join().

>     dbName     = "stockData.db"
>     stockTable = "stocks"
> 
>     conn = connectDatabase(dbLocation,dbName,stockTable)
>     stockList = retrieveStockDatabase(conn,stockTable)
> 
>     for s in stockList:
>         s.printStats()
> 
>     while (programEnd == False):

Better as:

     while not programEnd:

> 
>         decision = input(menu) # Print Menu

input() is often considered a bad function to use because it's
equivalent to eval(raw_input()), so the user could enter any expression.
It's better to use int(raw_input()) in this case and then catch the
ValueError if what was entered isn't an int.

> 
>         if (decision==1):
> 
>             if not(inputNewStock()==False):

A double-negative, equivalent to:

             if inputNewStock() != False:

It would be more Pythonic if you had inputNewStock() return the code,
etc, or raise an exception if there was an error. You could then catch
that exception in a 'try' block.

>                 stockList =
> createStockTracker(acode,price,quantity,stockList)
>                 newStockDatabase(conn,stockTable,stockList[-1])
>                 print("\n** New Stock **")
>                 stockList[-1].printStats()
>                 print "The stock "+code+" was successfully added to
> our database. \nNow every time the program runs it will automatically
> track this stock & obtain its stock attributes\n\n"
>                 # TO DO:
>                 # get new stock recent Data from internet etc.
>                 # add stock data to data base;
>         elif (decision==2):
>             if (len(stockList)>0):

Better as:

             if stockList:

>                 for Stock in stockList:
>                     URL = ASXurl+Stock.code
>                     sourceCode = getSource(URL)
>                     targetData = getTargetText(target %
> (Stock.code,Stock.code),"</tr>",sourceCode)
>                     getStockData(targetData,Stock)
>                     Stock.printStats()
>                     #writeStockToDatabase(conn,Stock)
>             else:
>                 print "You must first identify a stock to follow.
> \nPlease select option 1."
>         elif (decision==3):
>             print "Thank you for using Stock Program. Goodbye.\n"
>             programEnd = True; # Exit program
> 
>     conn.close()
>     return 0 # End program
> 
'main' is called by the main program and its return value is never used,
so just omit this return statement.

> main()[/CODE]

The recommended standard in Python is for names of classes to be
CamelCase, names of constants to be UPPERCASE_WITH_UNDERSCORES, and
names of everything else to be lowercase_with_underscores.


From no.email at nospam.invalid  Tue Mar 23 21:39:49 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Tue, 23 Mar 2010 18:39:49 -0700
Subject: GC is very expensive: am I doing something wrong?
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
	<mailman.963.1268958842.23598.python-list@python.org>
	<ho6ai4$b12$2@lust.ihug.co.nz>
	<mailman.1060.1269243742.23598.python-list@python.org>
	<ho8v4q$a4q$2@news.eternal-september.org>
	<mailman.1076.1269310331.23598.python-list@python.org>
	<7xwrx3mxuj.fsf@ruckus.brouhaha.com>
	<mailman.1083.1269338807.23598.python-list@python.org>
	<7xpr2v2wd7.fsf@ruckus.brouhaha.com>
	<mailman.1090.1269363241.23598.python-list@python.org>
Message-ID: <7xaaty4hwa.fsf@ruckus.brouhaha.com>

Antoine Pitrou <solipsis at pitrou.net> writes:
>> See: http://www.cs.rice.edu/~scrosby/hash/ ...
> Certainly interesting in a purely academic point of view, but in real 
> life if you want to cause a denial of service by overwhelming a server, 
> there are far more obvious options than trying to guess the server's use 
> of hash tables and trying to cause lots of collisions in them.

If you look at the very low bandwidth used in some of those hashtable
attacks, it's hard to see any other somewhat-generic attack that's
comparably effective.  Usually we think of "DOS" as involving massive
botnets and the like, not a dribble of a few hundred characters per
second.


From vipshopper.us at hotmail.com  Tue Mar 23 21:53:31 2010
From: vipshopper.us at hotmail.com (marrylin)
Date: Tue, 23 Mar 2010 18:53:31 -0700 (PDT)
Subject: Hello,everybody,the good shoping place,the new year approaching, 
	click in. Let's facelift bar! ===== HTTP://loveshopping.us   ====
Message-ID: <e570198a-ade3-4cd1-bc81-a5a1a86501d1@h18g2000yqo.googlegroups.com>

Hello,everybody,the good shoping place,the new year approaching, click
in. Let's facelift bar!
===== HTTP://loveshopping.us   ====

Air jordan(1-24)shoes $33

UGG BOOT $50

Nike shox(R4,NZ,OZ,TL1,TL2,TL3) $35

Handbags(Coach lv fendi d&g) $35

Tshirts (Polo ,ed hardy,lacoste) $16

Jean(True Religion,ed hardy,coogi) $30

Sunglasses(Oakey,coach,gucci,Armaini) $16

New era cap $15

Bikini (Ed hardy,polo) $25

FREE SHIPPING


From eire1130 at gmail.com  Tue Mar 23 22:51:48 2010
From: eire1130 at gmail.com (JR)
Date: Tue, 23 Mar 2010 19:51:48 -0700 (PDT)
Subject: 'gcc' failed with exit status 1
Message-ID: <8e68f9ea-7c99-4d52-90f3-0ea90b8f5c57@z3g2000yqz.googlegroups.com>

Hello All,

I was hoping I could get some help with this issue with getting Cython
to work. Earlier I had an issue that said "unable to find
vcvarsall.bat" and it turns out there is an active bug report that
covers that issue (I have a 64 bit windows system). I still hadn't
installed 3.1.2, so I did that tonight and now I have the issue below.
Any thoughts on what I am doing wrong?



Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\James>cd C:\Python31

C:\Python31>python setup.py build_ext --inplace
running build_ext
cythoning hello.pyx to hello.c

Error converting Pyrex file to C:
------------------------------------------------------------
...
def say_hello_to(name):
                      ^
------------------------------------------------------------

C:\Python31\hello.pyx:1:23: Unrecognized character
building 'hello' extension
C:\MinGW\bin\gcc.exe -mno-cygwin -mdll -O -Wall -IC:\Python31\include -
IC:\Pytho
n31\PC -c hello.c -o build\temp.win-amd64-3.1\Release\hello.o
hello.c:1:2: #error Do not use this file, it is the result of a failed
Cython co
mpilation.
error: command 'gcc' failed with exit status 1

C:\Python31>


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 24 00:41:01 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 24 Mar 2010 04:41:01 GMT
Subject: Unicode blues in Python3
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
	<mailman.1099.1269367884.23598.python-list@python.org>
	<3a428b39-bab1-48f2-b7df-560a849b8883@d27g2000yqf.googlegroups.com>
Message-ID: <pan.2010.03.24.04.41.02@REMOVE.THIS.cybersource.com.au>

On Tue, 23 Mar 2010 11:46:33 -0700, nn wrote:

> Actually what I want is to write a particular byte to standard output,
> and I want this to work regardless of where that output gets sent to.

What do you mean "work"?

Do you mean "display a particular glyph" or something else?

In bash:

$ echo -e "\0101"  # octal 101 = decimal 65
A
$ echo -e "\0375"  # decimal 253
?

but if I change the terminal encoding, I get this:

$ echo -e "\0375"
?

Or this:

$ echo -e "\0375"
?

depending on which encoding I use.

I think your question is malformed. You need to work out what behaviour 
you actually want, before you can ask for help on how to get it.



-- 
Steven


From stefan_ml at behnel.de  Wed Mar 24 02:48:58 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 24 Mar 2010 07:48:58 +0100
Subject: 'gcc' failed with exit status 1
In-Reply-To: <8e68f9ea-7c99-4d52-90f3-0ea90b8f5c57@z3g2000yqz.googlegroups.com>
References: <8e68f9ea-7c99-4d52-90f3-0ea90b8f5c57@z3g2000yqz.googlegroups.com>
Message-ID: <hocckq$dtv$1@dough.gmane.org>

JR, 24.03.2010 03:51:
> I was hoping I could get some help with this issue with getting Cython
> to work. Earlier I had an issue that said "unable to find
> vcvarsall.bat" and it turns out there is an active bug report that
> covers that issue (I have a 64 bit windows system). I still hadn't
> installed 3.1.2, so I did that tonight and now I have the issue below.
> Any thoughts on what I am doing wrong?
>
>
> Microsoft Windows [Version 6.1.7600]
> Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
>
> C:\Users\James>cd C:\Python31
>
> C:\Python31>python setup.py build_ext --inplace
> running build_ext
> cythoning hello.pyx to hello.c
>
> Error converting Pyrex file to C:
> ------------------------------------------------------------
> ...
> def say_hello_to(name):
>                        ^
> ------------------------------------------------------------
>
> C:\Python31\hello.pyx:1:23: Unrecognized character

Given that you're on Windows, this looks like a known bug in Cython:

http://trac.cython.org/cython_trac/ticket/520

This is due to the lack of universal newline support in the codecs module, 
which has been fixed in the new Py2.6+ 'io' module. A patch for Cython that 
switches to the new 'io' module and works around this issue in older Python 
versions is available:

http://hg.cython.org/cython-devel/raw-rev/751bdd38b55c

That being said, the simplest way to work around this issue is to switch to 
Unix line endings in your source file. Most editors support this without 
problems.

Stefan



From xenoszh at gmail.com  Wed Mar 24 03:23:39 2010
From: xenoszh at gmail.com (Parker)
Date: Wed, 24 Mar 2010 00:23:39 -0700 (PDT)
Subject: Python is cool!!
References: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
Message-ID: <a0b16b2b-ec03-433e-b37b-5bc33ca2f15e@t23g2000yqt.googlegroups.com>

On Mar 23, 4:55?pm, Jose Manuel <jfernan... at gmail.com> wrote:
> I have been learning Python, and it is amazing .... I am using the
> tutorial that comes with the official distribution.
>
> At the end my goal is to develop applied mathematic in engineering
> applications to be published on the Web, specially on app. oriented to
> simulations and control systems, I was about to start learning Java
> but I found Python which seems easier to learn that Java.
>
> Would it be easy to integrate Python in Web pages with HTML? I have
> read many info on Internet saying it is, and I hope so ....
>
> Any opinion

this must be the one you want
http://web2py.com/


From stef.mientki at gmail.com  Wed Mar 24 03:52:02 2010
From: stef.mientki at gmail.com (Stef Mientki)
Date: Wed, 24 Mar 2010 08:52:02 +0100
Subject: Python is cool!!
In-Reply-To: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
References: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
Message-ID: <4BA9C4A2.40100@gmail.com>

On 23-03-2010 17:55, Jose Manuel wrote:
> I have been learning Python, and it is amazing .... I am using the
> tutorial that comes with the official distribution.
>
> At the end my goal is to develop applied mathematic in engineering
> applications to be published on the Web, specially on app. oriented to
> simulations and control systems, I was about to start learning Java
> but I found Python which seems easier to learn that Java.
>
> Would it be easy to integrate Python in Web pages with HTML? I have
> read many info on Internet saying it is, and I hope so ....
>
> Any opinion
>    
you might take a look at http://www.sagemath.org/
cheers,
Stef
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From gagsl-py2 at yahoo.com.ar  Wed Mar 24 04:03:46 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 24 Mar 2010 05:03:46 -0300
Subject: Castrated traceback in sys.exc_info()
References: <7866674b-46ba-49e2-9d76-e8259ba22df0@z3g2000yqz.googlegroups.com>
	<20100317124019.7013dfa3@moriz.interne>
	<9fd96c3b1003170542t4ea864c6y359107cb747536da@mail.gmail.com>
	<op.u9uflwxxx6zn5v@lepton.softlabbsas.com.ar>
	<4BA7B4F7.6080404@wanadoo.fr>
	<op.u90bjsorx6zn5v@lepton.softlabbsas.com.ar>
	<mailman.1105.1269377396.23598.python-list@python.org>
	<0301d0b5-5d5d-436f-a342-16fe81b340d7@t41g2000yqt.googlegroups.com>
Message-ID: <op.u92bckfox6zn5v@gabriel.sleipnir-bsas>

En Tue, 23 Mar 2010 19:43:40 -0300, Vinay Sajip <vinay_sajip at yahoo.co.uk>  
escribi?:
> On Mar 23, 8:49 pm, Pascal Chambon <chambon.pas... at wanadoo.fr> wrote:
>>
>> Should I open an issue for this evolution of exceptiuon handling, or
>> should we content ourselves of this "hacking" of frame stck ?
>
> Possibly worth raising an issue (not logging-related), but perhaps
> it's worth seeing if this has come up before creating the issue.

There is, from 2006: http://bugs.python.org/issue1553375
I'll add a patch+tests to this issue.

-- 
Gabriel Genellina



From joho.smithury at gmail.com  Wed Mar 24 05:07:26 2010
From: joho.smithury at gmail.com (John Smithury)
Date: Wed, 24 Mar 2010 17:07:26 +0800
Subject: Where can i reference the "regular expressions"
Message-ID: <baf5916c1003240207keac00ebl1cb63ca5452fc43a@mail.gmail.com>

Dear pythoners,

I'm a new member to studay the python, i wan't to studay the "regular
expressions" handle like below:

==============source============
<line>the</line>
<line>is</line>
<line>name</line>
==============source end=========


after convert, the result like below:

-------------------------result------------------------
{'t','t','e'},
{'i','s'},
{'n','a','m','e'}
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From andreengels at gmail.com  Wed Mar 24 05:18:14 2010
From: andreengels at gmail.com (Andre Engels)
Date: Wed, 24 Mar 2010 10:18:14 +0100
Subject: Where can i reference the "regular expressions"
In-Reply-To: <baf5916c1003240207keac00ebl1cb63ca5452fc43a@mail.gmail.com>
References: <baf5916c1003240207keac00ebl1cb63ca5452fc43a@mail.gmail.com>
Message-ID: <6faf39c91003240218x770290c3l8c70ea5c3e70f6ac@mail.gmail.com>

On Wed, Mar 24, 2010 at 10:07 AM, John Smithury <joho.smithury at gmail.com> wrote:
> Dear pythoners,
>
> I'm a new member to studay the python, i wan't to studay the "regular
> expressions" handle like below:
>
> ==============source============
> <line>the</line>
> <line>is</line>
> <line>name</line>
> ==============source end=========
>
>
> after convert, the result like below:
>
> -------------------------result------------------------
> {'t','t','e'},
> {'i','s'},
> {'n','a','m','e'}

What did you think of yourself, and where did you get into the "I
don't know what to do now" place? Why do you think your problem would
have to do with regular expressions?



-- 
Andr? Engels, andreengels at gmail.com


From __peter__ at web.de  Wed Mar 24 05:34:31 2010
From: __peter__ at web.de (Peter Otten)
Date: Wed, 24 Mar 2010 10:34:31 +0100
Subject: logging: local functions ==> loss of lineno
References: <mailman.576.1268256192.23598.python-list@python.org>
	<hnaj9c$i0u$02$1@news.t-online.com>
	<4BA295A1.70207@hellmutweber.de>
	<mailman.972.1268995215.23598.python-list@python.org>
	<hnvqe5$vc$02$1@news.t-online.com>
	<mailman.977.1269006574.23598.python-list@python.org>
	<ho21dt$b6v$00$1@news.t-online.com>
	<d35c950b-c6e5-4162-8175-3e0a0255c71a@30g2000yqi.googlegroups.com>
Message-ID: <hocmak$ap$00$1@news.t-online.com>

Vinay Sajip wrote:

> Sorry I'm a little late to this discussion. I could add a _findCaller
> function to the module (not part of the public API, but replaceable by
> someone who really needs to) which does the heavy lifting, and
> Logger.findCaller just calls it. Then those who need to can implement
> their own strategy, without needing to jump through hoops. Does that
> approach sound helpful?

You mean you'd have to monkey-patch logging._findCaller() instead of 
overriding logging.Logger.findCaller()? 

I don't see a big advantage in that.

Here's an alternative proposal: simplify findCaller() by moving part of the 
code into a generator:

    def callers(self):
        """
        Walk up the call stack.
        Helper for findCaller().
        """
        f = currentframe()
        #On some versions of IronPython, currentframe() returns None if
        #IronPython isn't run with -X:Frames.
        if f is not None:
            f = f.f_back
        while hasattr(f, "f_code"):
            co = f.f_code
            filename = os.path.normcase(co.co_filename)
            yield filename, f.f_lineno, co.co_name
            f = f.f_back
    
    
    def findCaller(self):
        """
        Find the stack frame of the caller so that we can note the source
        file name, line number and function name.
        """
        for filename, lineno, funcname in self.callers():
            if filename != _srcfile:
                return filename, lineno, funcname
        return UNKNOWN_CALLER

Another simplification might be to have setLoggerClass() implicitly set the 
root logger and to drop the distinct RootLogger class completely. 

Note that I have no strong opinion on all this. If you leave things as is 
I'm fine with that.

Peter


From mail at timgolden.me.uk  Wed Mar 24 05:41:00 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 24 Mar 2010 09:41:00 +0000
Subject: using message loop for hotkey capturing
In-Reply-To: <bc7f680c1003231001rfeb6f33ve4d04d36d32e737a@mail.gmail.com>
References: <bc7f680c1003231001rfeb6f33ve4d04d36d32e737a@mail.gmail.com>
Message-ID: <4BA9DE2C.6060307@timgolden.me.uk>

On 23/03/2010 17:01, Alex Hall wrote:
> Hi all, but mainly Tim Golden:
> Tim, I am using your wonderful message loop for keyboard input, the
> one on your site that you pointed me to a few months ago. It has been
> working perfectly as long as I had only one dictionary of keys mapping
> to one dictionary of functions, but now I want two of each. My program
> has different modes, which may have varying keystrokes, and I also
> have some global keystrokes which are the same across all modes, like
> exiting or switching modes. I cannot figure out how to make the
> message loop look in two dictionaries at onc. I tried using an if,
> saying that if action_to_take was not set in the mode-specific
> dictionary then look at the global dictionary, but it is like it is
> never looking in the global dictionary at all. I get no syntax errors
> or problems when running the program, so it has to be something in my
> logic.

There's definitely some confusion, as MRAB picked up, with the
globalkeys / globalfuncs thing. I can see no problem with simply
defining an additional pair of dictionaries parallel with each of
the keys/funcs dictionaries (note that the numbers are different
from those of othe other dictionaries as these are the registration
ids of the hotkeys):

global_keys = {
   100: (68, win32com.MOD_ALT | win32con.MOD_CONTROL ...),
   ...
}

global_funcs = {
   100 : dict.ShowLookupDialog,
   ...
}

Then your central action code could be something like:

   action_to_take = global_funcs.get (msg.wParam) or HOTKEY_ACTIONS.get (msg.wParam)
   if action_to_take:
     action_to_take ()

This assumes that the funcs dictionaries will only ever contain a
valid function, so the only possible Falsish value will arise from
the get returning None.

TJG

BTW, you're shadowing a couple of builtins: global & dict which
might give you problems later if you needed them. There are other
issues with the structure of your code but nothing a little
refactoring couldn't sort out if you felt so inclined.


From andreengels at gmail.com  Wed Mar 24 05:50:37 2010
From: andreengels at gmail.com (Andre Engels)
Date: Wed, 24 Mar 2010 10:50:37 +0100
Subject: Where can i reference the "regular expressions"
In-Reply-To: <baf5916c1003240234u5c207d34l193d6560068162c@mail.gmail.com>
References: <baf5916c1003240207keac00ebl1cb63ca5452fc43a@mail.gmail.com> 
	<6faf39c91003240218x770290c3l8c70ea5c3e70f6ac@mail.gmail.com> 
	<baf5916c1003240234u5c207d34l193d6560068162c@mail.gmail.com>
Message-ID: <6faf39c91003240250p3327c795k6544ad089a96c464@mail.gmail.com>

On Wed, Mar 24, 2010 at 10:34 AM, John Smithury <joho.smithury at gmail.com> wrote:
> ==============source============
> <line>the</line>
> <line>is</line>
> <line>name</line>
> ==============source end=========
>
> First, get the word only(discard the "<line>" and "</line>"), it can use
> regular expression, right?
>
> the
> is
> name
> Second, get a charactor in each word and compose like format {'t','h','e'}
>>>>for a in line
>
>
> Most import is learning the "regular expressions" var this example.

Okay, then I'll go into that part.

regex = re.compile("<line>([^<>]*)</line>")

[^<>] here means "any character but < or >"
* means that we have any number (zero or more) of such characters
The brackets mean that this is the part of the expression we are
interested in (the group)
The expression as a whole thus means:
First <line>, then the part we are interested in, which is a random
string of things that are not < or >, then </line>

To use this expression (assuming 'text' is the string you want to check:

result = regex.findall(text)

will find all occurences of the regular expression, and provide you
with the content of the group.


-- 
Andr? Engels, andreengels at gmail.com


From jeanmichel at sequans.com  Wed Mar 24 06:37:17 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Wed, 24 Mar 2010 11:37:17 +0100
Subject: logging: local functions ==> loss of lineno
In-Reply-To: <hocmak$ap$00$1@news.t-online.com>
References: <mailman.576.1268256192.23598.python-list@python.org>	<hnaj9c$i0u$02$1@news.t-online.com>	<4BA295A1.70207@hellmutweber.de>	<mailman.972.1268995215.23598.python-list@python.org>	<hnvqe5$vc$02$1@news.t-online.com>	<mailman.977.1269006574.23598.python-list@python.org>	<ho21dt$b6v$00$1@news.t-online.com>	<d35c950b-c6e5-4162-8175-3e0a0255c71a@30g2000yqi.googlegroups.com>
	<hocmak$ap$00$1@news.t-online.com>
Message-ID: <4BA9EB5D.5050003@sequans.com>

Peter Otten wrote:
> Vinay Sajip wrote:
>
>   
>> Sorry I'm a little late to this discussion. I could add a _findCaller
>> function to the module (not part of the public API, but replaceable by
>> someone who really needs to) which does the heavy lifting, and
>> Logger.findCaller just calls it. Then those who need to can implement
>> their own strategy, without needing to jump through hoops. Does that
>> approach sound helpful?
>>     
>
> [snip] 
>
> Note that I have no strong opinion on all this. If you leave things as is 
> I'm fine with that.
>
> Peter
>   
Agreed, I'm not sure it's worth the effort Vinay.

JM



From mehgcap at gmail.com  Wed Mar 24 06:43:24 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Wed, 24 Mar 2010 06:43:24 -0400
Subject: exiting threaded program?
Message-ID: <bc7f680c1003240343w775fec8g8cc190bb921bac2d@mail.gmail.com>

Hi all,
I have a program with a timer in it, therefore I have multiple
threads. My method of exiting by using "user32.PostQuitMessage (0)" no
longer seems to be doing the job since I added the timer. What else do
I have to do to close my program? I say it is not closing because,
before, I would be returned to a prompt in the cmd line, but now I
cannot type in the cmd line window even after the program supposedly
closes, whereas before I could have. Thanks.

-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From vinay_sajip at yahoo.co.uk  Wed Mar 24 06:45:32 2010
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Wed, 24 Mar 2010 03:45:32 -0700 (PDT)
Subject: logging: local functions ==> loss of lineno
References: <mailman.576.1268256192.23598.python-list@python.org> 
	<hnaj9c$i0u$02$1@news.t-online.com> <4BA295A1.70207@hellmutweber.de> 
	<mailman.972.1268995215.23598.python-list@python.org>
	<hnvqe5$vc$02$1@news.t-online.com> 
	<mailman.977.1269006574.23598.python-list@python.org>
	<ho21dt$b6v$00$1@news.t-online.com> 
	<d35c950b-c6e5-4162-8175-3e0a0255c71a@30g2000yqi.googlegroups.com> 
	<hocmak$ap$00$1@news.t-online.com>
Message-ID: <b02720d8-a1b5-4133-a018-b3dd613be8e3@q21g2000yqm.googlegroups.com>

On Mar 24, 9:34?am, Peter Otten <__pete... at web.de> wrote:
>
> You mean you'd have to monkey-patchlogging._findCaller() instead of
> overridinglogging.Logger.findCaller()?
>
> I don't see a big advantage in that.
>

Only that you just have to replace a function, and not have to
subclass Logger + override findCaller. And it's not especially monkey-
patching if the function is put there specifically to be replaced when
needed :-)

> Another simplification might be to have setLoggerClass() implicitly set the
> root logger and to drop the distinct RootLogger class completely.

I can't remember now why I created a separate class for the root - I
thought it might have some specialization which never happened. Of
course, I'm not sure if anyone is using it, so I can't just get rid of
it. Anyway, the root logger is in some sense special so it might be
more useful in the future.

> Note that I have no strong opinion on all this. If you leave things as is
> I'm fine with that.

Yes, it's hardly a common case that the OP is mentioning. AFAIK this
is the first time it's come up. I just thought from your and Jean-
Michel's solutions that there might be a need felt by more people to
have this functionality be more flexible.

Regards,

Vinay Sajip


From mehgcap at gmail.com  Wed Mar 24 06:48:21 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Wed, 24 Mar 2010 06:48:21 -0400
Subject: using message loop for hotkey capturing
In-Reply-To: <4BA9DE2C.6060307@timgolden.me.uk>
References: <bc7f680c1003231001rfeb6f33ve4d04d36d32e737a@mail.gmail.com>
	<4BA9DE2C.6060307@timgolden.me.uk>
Message-ID: <bc7f680c1003240348paad9c5cj6104935a4617393c@mail.gmail.com>

Thanks, it seems to be working for now... Hopefully that trend continues!

On 3/24/10, Tim Golden <mail at timgolden.me.uk> wrote:
> On 23/03/2010 17:01, Alex Hall wrote:
>> Hi all, but mainly Tim Golden:
>> Tim, I am using your wonderful message loop for keyboard input, the
>> one on your site that you pointed me to a few months ago. It has been
>> working perfectly as long as I had only one dictionary of keys mapping
>> to one dictionary of functions, but now I want two of each. My program
>> has different modes, which may have varying keystrokes, and I also
>> have some global keystrokes which are the same across all modes, like
>> exiting or switching modes. I cannot figure out how to make the
>> message loop look in two dictionaries at onc. I tried using an if,
>> saying that if action_to_take was not set in the mode-specific
>> dictionary then look at the global dictionary, but it is like it is
>> never looking in the global dictionary at all. I get no syntax errors
>> or problems when running the program, so it has to be something in my
>> logic.
>
> There's definitely some confusion, as MRAB picked up, with the
> globalkeys / globalfuncs thing. I can see no problem with simply
> defining an additional pair of dictionaries parallel with each of
> the keys/funcs dictionaries (note that the numbers are different
> from those of othe other dictionaries as these are the registration
> ids of the hotkeys):
>
> global_keys = {
>    100: (68, win32com.MOD_ALT | win32con.MOD_CONTROL ...),
>    ...
> }
>
> global_funcs = {
>    100 : dict.ShowLookupDialog,
>    ...
> }
>
> Then your central action code could be something like:
>
>    action_to_take = global_funcs.get (msg.wParam) or HOTKEY_ACTIONS.get
> (msg.wParam)
>    if action_to_take:
>      action_to_take ()
>
> This assumes that the funcs dictionaries will only ever contain a
> valid function, so the only possible Falsish value will arise from
> the get returning None.
>
> TJG
>
> BTW, you're shadowing a couple of builtins: global & dict which
> might give you problems later if you needed them. There are other
> issues with the structure of your code but nothing a little
> refactoring couldn't sort out if you felt so inclined.
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From mail at timgolden.me.uk  Wed Mar 24 06:48:55 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 24 Mar 2010 10:48:55 +0000
Subject: exiting threaded program?
In-Reply-To: <bc7f680c1003240343w775fec8g8cc190bb921bac2d@mail.gmail.com>
References: <bc7f680c1003240343w775fec8g8cc190bb921bac2d@mail.gmail.com>
Message-ID: <4BA9EE17.4050606@timgolden.me.uk>

On 24/03/2010 10:43, Alex Hall wrote:
> Hi all,
> I have a program with a timer in it, therefore I have multiple
> threads. My method of exiting by using "user32.PostQuitMessage (0)" no
> longer seems to be doing the job since I added the timer. What else do
> I have to do to close my program? I say it is not closing because,
> before, I would be returned to a prompt in the cmd line, but now I
> cannot type in the cmd line window even after the program supposedly
> closes, whereas before I could have. Thanks.
>

Make the timer thread a daemon?

TJG


From alfps at start.no  Wed Mar 24 06:55:34 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 24 Mar 2010 11:55:34 +0100
Subject: exiting threaded program?
In-Reply-To: <mailman.1125.1269427406.23598.python-list@python.org>
References: <mailman.1125.1269427406.23598.python-list@python.org>
Message-ID: <hocqvd$rct$1@news.eternal-september.org>

* Alex Hall:
> Hi all,
> I have a program with a timer in it, therefore I have multiple
> threads.

Is the "therefore..." an inference or independendent information?

If it is an inference then it may not be correct.

For example, timers in a GUI program need not involve additional threads.


> My method of exiting by using "user32.PostQuitMessage (0)"

This sounds like the Windows API level accessed from Python, not Python level?

At the Windows API level, as I recall PostQuitMessage results in a WM_QUIT 
posted to the current thread's message queue, where it'll be processed by this 
thread's message loop, if it has one, which will then ideally finish.

Possibly, if you indeed have more than one thread, you're posting the WM_QUIT to 
the wrong thread  --  to quit the app it needs to be posted to the main thread.


> no
> longer seems to be doing the job since I added the timer. What else do
> I have to do to close my program? I say it is not closing because,
> before, I would be returned to a prompt in the cmd line, but now I
> cannot type in the cmd line window even after the program supposedly
> closes, whereas before I could have. Thanks.

Try to reduce the problem to a minimal complete program, and post that?

Unless the above comments help?


Cheers,

- Alf


From mehgcap at gmail.com  Wed Mar 24 07:04:40 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Wed, 24 Mar 2010 07:04:40 -0400
Subject: exiting threaded program?
In-Reply-To: <4BA9EE17.4050606@timgolden.me.uk>
References: <bc7f680c1003240343w775fec8g8cc190bb921bac2d@mail.gmail.com>
	<4BA9EE17.4050606@timgolden.me.uk>
Message-ID: <bc7f680c1003240404q5f0df9f8q805ca41e1907250b@mail.gmail.com>

A daemon... Good idea, and that makes more sense for what the thread
does anyway; it is just a timer, updating a variable by contacting a
server every hour. By the way, just what is the difference between
user32.PostQuitMessage (0) and sys.exit()?


On 3/24/10, Tim Golden <mail at timgolden.me.uk> wrote:
> On 24/03/2010 10:43, Alex Hall wrote:
>> Hi all,
>> I have a program with a timer in it, therefore I have multiple
>> threads. My method of exiting by using "user32.PostQuitMessage (0)" no
>> longer seems to be doing the job since I added the timer. What else do
>> I have to do to close my program? I say it is not closing because,
>> before, I would be returned to a prompt in the cmd line, but now I
>> cannot type in the cmd line window even after the program supposedly
>> closes, whereas before I could have. Thanks.
>>
>
> Make the timer thread a daemon?
>
> TJG
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From mail at timgolden.me.uk  Wed Mar 24 07:08:06 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 24 Mar 2010 11:08:06 +0000
Subject: exiting threaded program?
In-Reply-To: <bc7f680c1003240404q5f0df9f8q805ca41e1907250b@mail.gmail.com>
References: <bc7f680c1003240343w775fec8g8cc190bb921bac2d@mail.gmail.com>	
	<4BA9EE17.4050606@timgolden.me.uk>
	<bc7f680c1003240404q5f0df9f8q805ca41e1907250b@mail.gmail.com>
Message-ID: <4BA9F296.4010504@timgolden.me.uk>

On 24/03/2010 11:04, Alex Hall wrote:
> A daemon... Good idea, and that makes more sense for what the thread
> does anyway; it is just a timer, updating a variable by contacting a
> server every hour. By the way, just what is the difference between
> user32.PostQuitMessage (0) and sys.exit()?

The former is a notification to a Windows message loop (something
most Python programs don't have) that it should exit; the latter
is a system call to exit the running program -- after any message
loops have completed if applicable.

BTW if you're running a Windows message loop anyway, you could just
use Windows timers, catch the WM_TIMER message and avoid the complication
of threads. Just an idea.

TJG


From info at egenix.com  Wed Mar 24 08:36:39 2010
From: info at egenix.com (eGenix Team: M.-A. Lemburg)
Date: Wed, 24 Mar 2010 13:36:39 +0100
Subject: ANN: eGenix mxODBC Zope Database Adapter 2.0.0
Message-ID: <4BAA0757.5050701@egenix.com>

________________________________________________________________________
ANNOUNCEMENT

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________________________________________________________________________
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Mac OS X, FreeBSD and other platforms.

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CMS.

________________________________________________________________________
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 * New decimal support to have the Zope DA return decimal
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________________________________________________________________________
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   you can get a 20% discount on the full price of version 2.0.

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   you can get a 40% discount on the full price of version 2.0.

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   eGenix.com Software, Skills and Services GmbH  Pastor-Loeh-Str.48
    D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
           Registered at Amtsgericht Duesseldorf: HRB 46611
               http://www.egenix.com/company/contact/


From pruebauno at latinmail.com  Wed Mar 24 09:03:31 2010
From: pruebauno at latinmail.com (nn)
Date: Wed, 24 Mar 2010 06:03:31 -0700 (PDT)
Subject: Unicode blues in Python3
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
	<mailman.1099.1269367884.23598.python-list@python.org>
	<3a428b39-bab1-48f2-b7df-560a849b8883@d27g2000yqf.googlegroups.com>
	<mailman.1101.1269374267.23598.python-list@python.org>
	<c75d1abb-2674-4c67-9701-38946b5db58f@l25g2000yqd.googlegroups.com>
	<4BA943E7.5000202@v.loewis.de>
Message-ID: <0250ffe0-0bb0-4cb2-8c3e-6446fb51b0b8@r27g2000yqn.googlegroups.com>



Martin v. Loewis wrote:
> nn wrote:
> >
> > Stefan Behnel wrote:
> >> nn, 23.03.2010 19:46:
> >>> Actually what I want is to write a particular byte to standard output,
> >>> and I want this to work regardless of where that output gets sent to.
> >>> I am aware that I could do
> >>> open('nnout','w',encoding='latin1').write(mychar) but I am porting a
> >>> python2 program and don't want to rewrite everything that uses that
> >>> script.
> >> Are you writing text or binary data to stdout?
> >>
> >> Stefan
> >
> > latin1 charset text.
>
> Are you sure about that? If you carefully reconsider, could you come to
> the conclusion that you are not writing text at all, but binary data?
>
> If it really was text that you write, why do you need to use
> U+00FD (LATIN SMALL LETTER Y WITH ACUTE). To my knowledge, that
> character is really infrequently used in practice. So that you try to
> write it strongly suggests that it is not actually text what you are
> writing.
>
> Also, your formulation suggests the same:
>
> "Is there any way to write a value 253 to standard output?"
>
> If you would really be writing text, you'd ask
>
>
> "Is there any way to write '?' to standard output?"
>
> Regards,
> Martin

To be more informative I am both writing text and binary data
together. That is I am embedding text from another source into stream
that uses non-ascii characters as "control" characters. In Python2 I
was processing it mostly as text containing a few "funny" characters.


From pruebauno at latinmail.com  Wed Mar 24 09:08:26 2010
From: pruebauno at latinmail.com (nn)
Date: Wed, 24 Mar 2010 06:08:26 -0700 (PDT)
Subject: Unicode blues in Python3
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
	<mailman.1099.1269367884.23598.python-list@python.org>
	<3a428b39-bab1-48f2-b7df-560a849b8883@d27g2000yqf.googlegroups.com>
	<pan.2010.03.24.04.41.02@REMOVE.THIS.cybersource.com.au>
Message-ID: <5db21794-371b-42eb-8c08-06395149faea@y17g2000yqd.googlegroups.com>



Steven D'Aprano wrote:
> On Tue, 23 Mar 2010 11:46:33 -0700, nn wrote:
>
> > Actually what I want is to write a particular byte to standard output,
> > and I want this to work regardless of where that output gets sent to.
>
> What do you mean "work"?
>
> Do you mean "display a particular glyph" or something else?
>
> In bash:
>
> $ echo -e "\0101"  # octal 101 = decimal 65
> A
> $ echo -e "\0375"  # decimal 253
> ?
>
> but if I change the terminal encoding, I get this:
>
> $ echo -e "\0375"
> ?
>
> Or this:
>
> $ echo -e "\0375"
> ?
>
> depending on which encoding I use.
>
> I think your question is malformed. You need to work out what behaviour
> you actually want, before you can ask for help on how to get it.
>
>
>
> --
> Steven

Yes sorry it is a bit ambiguous. I don't really care what glyph is,
the program reading my output reads 8 bit values expects the binary
value 0xFD as control character and lets everything else through as is.


From melanienicoleo at gmail.com  Wed Mar 24 09:32:27 2010
From: melanienicoleo at gmail.com (melanienicoleo)
Date: Wed, 24 Mar 2010 06:32:27 -0700 (PDT)
Subject: UNDERAGE DAUGHTERS FUCK - FATHER-YOUNG DAUGHTER INCEST - SEXY YOUNG 
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Message-ID: <e18a5ff0-f73b-4087-bea9-89a3a6825df7@b33g2000yqc.googlegroups.com>

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From solipsis at pitrou.net  Wed Mar 24 09:41:11 2010
From: solipsis at pitrou.net (Antoine Pitrou)
Date: Wed, 24 Mar 2010 13:41:11 +0000 (UTC)
Subject: Unicode blues in Python3
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
Message-ID: <hod4pn$tks$1@dough.gmane.org>

Le Tue, 23 Mar 2010 10:33:33 -0700, nn a ?crit?:

> I know that unicode is the way to go in Python 3.1, but it is getting in
> my way right now in my Unix scripts. How do I write a chr(253) to a
> file?
> 
> #nntst2.py
> import sys,codecs
> mychar=chr(253)
> print(sys.stdout.encoding)
> print(mychar)

print() writes to the text (unicode) layer of sys.stdout.
If you want to access the binary (bytes) layer, you must use 
sys.stdout.buffer. So:

  sys.stdout.buffer.write(chr(253).encode('latin1'))

or:

  sys.stdout.buffer.write(bytes([253]))

See http://docs.python.org/py3k/library/io.html#io.TextIOBase.buffer




From lawandawil at gmail.com  Wed Mar 24 10:14:48 2010
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Date: Wed, 24 Mar 2010 07:14:48 -0700 (PDT)
Subject: PRETEEN ASIAN NUDES - UNCENSORED UNDERAGE SEX - YOUNG FUCK ASIAN
Message-ID: <95203262-9476-4a0a-b5c8-d2061fb348c1@z4g2000yqa.googlegroups.com>

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From hv at tbz-pariv.de  Wed Mar 24 10:29:03 2010
From: hv at tbz-pariv.de (Thomas Guettler)
Date: Wed, 24 Mar 2010 15:29:03 +0100
Subject: crypto: verify external pkcs7 signature
Message-ID: <80ulu3Fg0jU1@mid.individual.net>

Hi,

some black box system gives me secKey.pkcs7 signature and
a data file. The signature should be correct, but it fails.


On newer system I get this: M2Crypto.SMIME.PKCS7_Error: digest failure

on older systems (openssl-0.9.8h-28.10.1) I get PKCS7 routines:PKCS7_verify:signature failure:pk7_smime.c:312

On a system with openssl-0.9.8e-45.13 the script creates a core dump.

Any hints?

{{{
def verify(file):
    s = SMIME.SMIME()
    cert_file='CN=NW4.cert'
    x509=X509.load_cert(cert_file)
    sk=X509.X509_Stack()
    sk.push(x509)
    s.set_x509_stack(sk)

    # Load the signer's CA cert. In this case, because the signer's
    # cert is self-signed, it is the signer's cert itself.

    st = X509.X509_Store()
    st.load_info(cert_file)  # CA Cert
    s.set_x509_store(st)
    from M2Crypto.BIO import File

    # Load the data, verify it.
    p7=SMIME.load_pkcs7('secKey.pkcs7')
    try:
        print s.verify(p7, File(open(file)))
    except (M2Crypto.SMIME.PKCS7_Error, M2Crypto.SMIME.SMIME_Error), exc:
        print '%s failed: %s' % (file, str(exc).strip())
        return False
    return True
}}}


-- 
Thomas Guettler, http://www.thomas-guettler.de/
E-Mail: guettli (*) thomas-guettler + de


From python at bdurham.com  Wed Mar 24 10:52:40 2010
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 24 Mar 2010 10:52:40 -0400
Subject: Sniffing encoding type by looking at file BOM header
Message-ID: <1269442360.3213.1366489361@webmail.messagingengine.com>

I assume there's no standard library function that wraps
codecs.open() to sniff a file's BOM header and open the file with
the appropriate encoding?

My reading of the docs leads me to believe that there are 5 
types of possible BOM headers with multiple names (synoymns?)
for the same BOM encoding type.

BOM          = '\xff\xfe'
BOM_LE       = '\xff\xfe'
BOM_UTF16    = '\xff\xfe'
BOM_UTF16_LE = '\xff\xfe'

BOM_BE       = '\xfe\xff'
BOM32_BE     = '\xfe\xff'
BOM_UTF16_BE = '\xfe\xff'

BOM64_BE     = '\x00\x00\xfe\xff'
BOM_UTF32_BE = '\x00\x00\xfe\xff'

BOM64_LE     = '\xff\xfe\x00\x00'
BOM_UTF32    = '\xff\xfe\x00\x00'
BOM_UTF32_LE = '\xff\xfe\x00\x00'

BOM_UTF8     = '\xef\xbb\xbf'

Is the process of writing a BOM sniffer readlly as simple 
as detecting one of these 5 header types and then calling 
codecs.open() with the appropriate encoding= parameter?

Note: I'm only interested in Unicode encodings. I am not
interested in any of the non-Unicode encodings supported 
by the codecs module.

Thank you,
Malcolm


From googler.1.webmaster at spamgourmet.com  Wed Mar 24 11:09:27 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Wed, 24 Mar 2010 08:09:27 -0700 (PDT)
Subject: C-API: Extract information from function object
Message-ID: <b7632ea7-5523-4419-bc6b-b07bb2e6a443@g19g2000yqe.googlegroups.com>

Hi,

I have a reference to a function and would like to know how to extract
information from a function object.

Information I am looking for: line and file where this function is
from.

PyObject_Call can do this to when I call a function object and
something failed so these information are written to the traceback. So
any suggestions how to do that?

Thx!! moerchendiser2k3


From anand.shashwat at gmail.com  Wed Mar 24 11:17:12 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Wed, 24 Mar 2010 20:47:12 +0530
Subject: spams
Message-ID: <d4ab53de1003240817n32427eb1wcefb0128637ae5e5@mail.gmail.com>

Lately this list have been spammed a lot. Any workarounds by moderators?

~l0nwlf
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From yoavglazner at gmail.com  Wed Mar 24 11:27:38 2010
From: yoavglazner at gmail.com (Glazner)
Date: Wed, 24 Mar 2010 08:27:38 -0700 (PDT)
Subject: Advice needed on parallel processing in python
Message-ID: <0a050a71-8ff1-4393-aba9-9115eb38cbec@q21g2000yqm.googlegroups.com>

Hi!

I need to replace an app that does number crunching over a local
network.
it have about 50 computers as slaves
each computer needs to run COM that will do the "job"
right now the system uses MFC threads and DCOM to distribute the load.

as i said, Now i'm trying to replace this system with python.
I already use win32all and read about Pareller Python and Pyro.

a requirement is that messages can be sent to the remote worker.

If anyone can share experience I'll love to hear


Many Thanks,
Yoav Glazner


From no.email at please.post  Wed Mar 24 11:29:07 2010
From: no.email at please.post (kj)
Date: Wed, 24 Mar 2010 15:29:07 +0000 (UTC)
Subject: sum for sequences?
Message-ID: <hodb43$pt$1@reader1.panix.com>



Is there a sequence-oriented equivalent to the sum built-in?  E.g.:

  seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)

?

(By "sequence" I'm referring primarily to lists and tuples, and
excluding strings, since for these there is ''.join()).

TIA!

~K


From yoavglazner at gmail.com  Wed Mar 24 11:39:10 2010
From: yoavglazner at gmail.com (Glazner)
Date: Wed, 24 Mar 2010 08:39:10 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
Message-ID: <f3834509-02f0-472a-b71c-ea6ffdd74c77@q16g2000yqq.googlegroups.com>

On Mar 24, 5:29?pm, kj <no.em... at please.post> wrote:
> Is there a sequence-oriented equivalent to the sum built-in? ?E.g.:
>
> ? seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)
>
> ?
>
> (By "sequence" I'm referring primarily to lists and tuples, and
> excluding strings, since for these there is ''.join()).
>
> TIA!
>
> ~K

try itertools.chain


From neilc at norwich.edu  Wed Mar 24 11:42:02 2010
From: neilc at norwich.edu (Neil Cerutti)
Date: 24 Mar 2010 15:42:02 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
Message-ID: <80uq6aF6i4U1@mid.individual.net>

On 2010-03-24, kj <no.email at please.post> wrote:
>
>
> Is there a sequence-oriented equivalent to the sum built-in?  E.g.:
>
>   seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)
>
> ?
>
> (By "sequence" I'm referring primarily to lists and tuples, and
> excluding strings, since for these there is ''.join()).

reduce, or functools.reduce in Python 3.1.

>>> functools.reduce(operator.add, ((1, 2), (5, 6)))
(1, 2, 5, 6)

-- 
Neil Cerutti
"It's not fun to build walls. But it's even less fun to live
without walls in a world full of zombies." --Greedy Goblin


From insomnia.iit.roorkee at gmail.com  Wed Mar 24 11:42:44 2010
From: insomnia.iit.roorkee at gmail.com (insomnia iit roookee)
Date: Wed, 24 Mar 2010 08:42:44 -0700 (PDT)
Subject: coding contest
Message-ID: <da55efd6-877d-4579-b626-242b1425b4f8@s20g2000prm.googlegroups.com>

 IIT ROORKEE COGNIZANCE presents INSOMNIA :THE MIDNIGHT PROGRAMMING
CONTEST...
 www.insomnia.cognizance.org.in

  Starts on : 27th March, 9:00 PM

Cash prizes worth Rs.30,000 on stake for this round.
(PS: Problems of previous rounds are available for practice.)


From darcy at druid.net  Wed Mar 24 11:42:51 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Wed, 24 Mar 2010 11:42:51 -0400
Subject: spams
In-Reply-To: <d4ab53de1003240817n32427eb1wcefb0128637ae5e5@mail.gmail.com>
References: <d4ab53de1003240817n32427eb1wcefb0128637ae5e5@mail.gmail.com>
Message-ID: <20100324114251.ac0714c8.darcy@druid.net>

On Wed, 24 Mar 2010 20:47:12 +0530
Shashwat Anand <anand.shashwat at gmail.com> wrote:
> Lately this list have been spammed a lot. Any workarounds by moderators?

Not as long as it is gatewayed to Usenet.  You can kill most of the
spam by blocking anything from gmail.com with a Newsgroups line.
Unfortunately you will also block a lot of legitimate postings.

If they would turn off the gateway then legitimate posters can choose
to join the list but as long as the gateway is there then there is no
reason to switch.

With the gateway off there are all sorts of tools to reduce spam.  I
think the best one is to set the flag to only allow subscribers to post
and to start all new users as moderated and remove the moderation on
the first posting as long as it is not spam.  If the first posting is
not spam then chances are none of the rest from that user will be spam.

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


From steve at holdenweb.com  Wed Mar 24 11:42:52 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 24 Mar 2010 11:42:52 -0400
Subject: sum for sequences?
In-Reply-To: <hodb43$pt$1@reader1.panix.com>
References: <hodb43$pt$1@reader1.panix.com>
Message-ID: <hodbu9$vdn$1@dough.gmane.org>

kj wrote:
> 
> Is there a sequence-oriented equivalent to the sum built-in?  E.g.:
> 
>   seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)
> 
> ?
> 
> (By "sequence" I'm referring primarily to lists and tuples, and
> excluding strings, since for these there is ''.join()).
> 
Do you mean you want to flatten a list structure? There have been
several discussions about this, which Google will find for you quite easily.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From no.email at please.post  Wed Mar 24 12:05:10 2010
From: no.email at please.post (kj)
Date: Wed, 24 Mar 2010 16:05:10 +0000 (UTC)
Subject: What's the matter with docs.python.org?
Message-ID: <hodd7m$9vs$1@reader1.panix.com>




In the last couple of weeks, docs.python.org has been down repeatedly
(like right now).  Has anyone else noticed this?

~K



From python at bdurham.com  Wed Mar 24 12:17:16 2010
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 24 Mar 2010 12:17:16 -0400
Subject: Programmatically discovering encoding types supported by codecs module
Message-ID: <1269447436.19612.1366507993@webmail.messagingengine.com>

Is there a way to programmatically discover the encoding types
supported by the codecs module?

For example, the following link shows a table with Codec,
Aliases, and Language columns.
http://docs.python.org/library/codecs.html#standard-encodings

I'm looking for a way to programmatically generate this table
through some form of module introspection.

Ideas?

Malcolm
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From python at bdurham.com  Wed Mar 24 12:19:09 2010
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 24 Mar 2010 12:19:09 -0400
Subject: What's the matter with docs.python.org?
In-Reply-To: <hodd7m$9vs$1@reader1.panix.com>
References: <hodd7m$9vs$1@reader1.panix.com>
Message-ID: <1269447549.19932.1366508801@webmail.messagingengine.com>

KJ,

> In the last couple of weeks, docs.python.org has been down repeatedly
> (like right now).  Has anyone else noticed this?

I've been surfing docs.python.org all morning and haven't had any
problems.

I'm connecting from Bethlehem, PA (USA).

Malcolm


From philip at semanchuk.com  Wed Mar 24 12:19:19 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Wed, 24 Mar 2010 12:19:19 -0400
Subject: What's the matter with docs.python.org?
In-Reply-To: <hodd7m$9vs$1@reader1.panix.com>
References: <hodd7m$9vs$1@reader1.panix.com>
Message-ID: <2329E820-C060-43F2-AE3C-0FBF53221AA9@semanchuk.com>


On Mar 24, 2010, at 12:05 PM, kj wrote:

> In the last couple of weeks, docs.python.org has been down repeatedly
> (like right now).  Has anyone else noticed this?



http://downforeveryoneorjustme.com/docs.python.org

Works for me...

HTH
Philip


From duncan.booth at invalid.invalid  Wed Mar 24 12:20:17 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 24 Mar 2010 16:20:17 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
Message-ID: <Xns9D45A63272098duncanbooth@127.0.0.1>

kj <no.email at please.post> wrote:

> Is there a sequence-oriented equivalent to the sum built-in?  E.g.:
> 
>   seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)
> 
> ?
> 
Apart from the suggestions for Google for general list flattening, for this 
specific example you could just use the 'sum' built-in:

>>> sum(((1, 2), (5, 6)), ())
(1, 2, 5, 6)

Just give it an empty tuple as the starting value.


From steve at holdenweb.com  Wed Mar 24 12:24:55 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 24 Mar 2010 12:24:55 -0400
Subject: What's the matter with docs.python.org?
In-Reply-To: <hodd7m$9vs$1@reader1.panix.com>
References: <hodd7m$9vs$1@reader1.panix.com>
Message-ID: <hoded5$b26$1@dough.gmane.org>

kj wrote:
> 
> 
> In the last couple of weeks, docs.python.org has been down repeatedly
> (like right now).  Has anyone else noticed this?

http://downforeveryoneorjustme.com/docs.python.org

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From no.email at please.post  Wed Mar 24 12:25:45 2010
From: no.email at please.post (kj)
Date: Wed, 24 Mar 2010 16:25:45 +0000 (UTC)
Subject: What's the matter with docs.python.org?
References: <hodd7m$9vs$1@reader1.panix.com>
	<mailman.1145.1269447568.23598.python-list@python.org>
Message-ID: <hodee9$3dt$1@reader1.panix.com>

In <mailman.1145.1269447568.23598.python-list at python.org> Philip Semanchuk <philip at semanchuk.com> writes:


>On Mar 24, 2010, at 12:05 PM, kj wrote:

>> In the last couple of weeks, docs.python.org has been down repeatedly
>> (like right now).  Has anyone else noticed this?



>http://downforeveryoneorjustme.com/docs.python.org

Very handy.  Thanks!

~K


From gagsl-py2 at yahoo.com.ar  Wed Mar 24 12:49:30 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 24 Mar 2010 13:49:30 -0300
Subject: C-API: Extract information from function object
References: <b7632ea7-5523-4419-bc6b-b07bb2e6a443@g19g2000yqe.googlegroups.com>
Message-ID: <op.u92zosmwx6zn5v@gabriel.sleipnir-bsas>

En Wed, 24 Mar 2010 12:09:27 -0300, moerchendiser2k3  
<googler.1.webmaster at spamgourmet.com> escribi?:

> I have a reference to a function and would like to know how to extract
> information from a function object.
>
> Information I am looking for: line and file where this function is
> from.
>
> PyObject_Call can do this to when I call a function object and
> something failed so these information are written to the traceback. So
> any suggestions how to do that?

See the Language Reference; the associated code object holds the file and  
starting line the function comes from.
The traceback object contains better information (like the line being  
executed instead of the first one). Why don't you use it instead?

-- 
Gabriel Genellina



From anand.shashwat at gmail.com  Wed Mar 24 13:12:09 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Wed, 24 Mar 2010 22:42:09 +0530
Subject: spams
In-Reply-To: <20100324114251.ac0714c8.darcy@druid.net>
References: <d4ab53de1003240817n32427eb1wcefb0128637ae5e5@mail.gmail.com> 
	<20100324114251.ac0714c8.darcy@druid.net>
Message-ID: <d4ab53de1003241012r7bfa6e30v5a89d30c0f2f2aad@mail.gmail.com>

seems good :)

On Wed, Mar 24, 2010 at 9:12 PM, D'Arcy J.M. Cain <darcy at druid.net> wrote:

> On Wed, 24 Mar 2010 20:47:12 +0530
> Shashwat Anand <anand.shashwat at gmail.com> wrote:
> > Lately this list have been spammed a lot. Any workarounds by moderators?
>
> Not as long as it is gatewayed to Usenet.  You can kill most of the
> spam by blocking anything from gmail.com with a Newsgroups line.
> Unfortunately you will also block a lot of legitimate postings.
>
> If they would turn off the gateway then legitimate posters can choose
> to join the list but as long as the gateway is there then there is no
> reason to switch.
>
> With the gateway off there are all sorts of tools to reduce spam.  I
> think the best one is to set the flag to only allow subscribers to post
> and to start all new users as moderated and remove the moderation on
> the first posting as long as it is not spam.  If the first posting is
> not spam then chances are none of the rest from that user will be spam.
>
> --
> D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
> http://www.druid.net/darcy/                |  and a sheep voting on
> +1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.
>
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From benjamin.kaplan at case.edu  Wed Mar 24 13:18:32 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 24 Mar 2010 13:18:32 -0400
Subject: Programmatically discovering encoding types supported by codecs 
	module
In-Reply-To: <1269447436.19612.1366507993@webmail.messagingengine.com>
References: <1269447436.19612.1366507993@webmail.messagingengine.com>
Message-ID: <ec96e1391003241018y136a4791odba7402b0ad3f95c@mail.gmail.com>

On Wed, Mar 24, 2010 at 12:17 PM,  <python at bdurham.com> wrote:
> Is there a way to programmatically discover the encoding types supported by
> the codecs module?
>
> For example, the following link shows a table with Codec, Aliases, and
> Language columns.
> http://docs.python.org/library/codecs.html#standard-encodings
>
> I'm looking for a way to programmatically generate this table through some
> form of module introspection.
>
> Ideas?
>
> Malcolm
> --

According to my brief messing around with the REPL,
encodings.aliases.aliases is a good place to start. I don't know of
any way to get the Language column, but at the very least that will
give you most of the supported encodings and any aliases they have.


From torriem at gmail.com  Wed Mar 24 13:33:46 2010
From: torriem at gmail.com (Michael Torrie)
Date: Wed, 24 Mar 2010 11:33:46 -0600
Subject: Unicode blues in Python3
In-Reply-To: <pan.2010.03.24.04.41.02@REMOVE.THIS.cybersource.com.au>
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>	<mailman.1099.1269367884.23598.python-list@python.org>	<3a428b39-bab1-48f2-b7df-560a849b8883@d27g2000yqf.googlegroups.com>
	<pan.2010.03.24.04.41.02@REMOVE.THIS.cybersource.com.au>
Message-ID: <4BAA4CFA.7000907@gmail.com>

Steven D'Aprano wrote:
> I think your question is malformed. You need to work out what behaviour 
> you actually want, before you can ask for help on how to get it.

It may or may not be malformed, but I understand the question.  So let
eme translate for you.  How can he write arbitrary bytes ( 0x0 through
0xff) to stdout without having them mangled by encodings.  It's a very
simple question, really.  Looks like Antoine Pitrou has answered this
question quite nicely as well.


From pruebauno at latinmail.com  Wed Mar 24 13:34:20 2010
From: pruebauno at latinmail.com (nn)
Date: Wed, 24 Mar 2010 10:34:20 -0700 (PDT)
Subject: Unicode blues in Python3
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
	<mailman.1138.1269438095.23598.python-list@python.org>
Message-ID: <408cc5cf-28ac-440e-9536-e557347c6c1f@i25g2000yqm.googlegroups.com>



Antoine Pitrou wrote:
> Le Tue, 23 Mar 2010 10:33:33 -0700, nn a ?crit?:
>
> > I know that unicode is the way to go in Python 3.1, but it is getting in
> > my way right now in my Unix scripts. How do I write a chr(253) to a
> > file?
> >
> > #nntst2.py
> > import sys,codecs
> > mychar=chr(253)
> > print(sys.stdout.encoding)
> > print(mychar)
>
> print() writes to the text (unicode) layer of sys.stdout.
> If you want to access the binary (bytes) layer, you must use
> sys.stdout.buffer. So:
>
>   sys.stdout.buffer.write(chr(253).encode('latin1'))
>
> or:
>
>   sys.stdout.buffer.write(bytes([253]))
>
> See http://docs.python.org/py3k/library/io.html#io.TextIOBase.buffer

Just what I needed! Now I full control of the output.

Thanks Antoine. The new io stack is still a bit of a mystery to me.

Thanks everybody else, and sorry for confusing the issue. Latin1 just
happens to be very convenient to manipulate bytes and is what I
thought of initially to handle my mix of textual and non-textual data.


From gagsl-py2 at yahoo.com.ar  Wed Mar 24 13:39:20 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 24 Mar 2010 14:39:20 -0300
Subject: Programmatically discovering encoding types supported by codecs
	module
References: <1269447436.19612.1366507993@webmail.messagingengine.com>
Message-ID: <op.u921zuyjx6zn5v@gabriel.sleipnir-bsas>

En Wed, 24 Mar 2010 13:17:16 -0300, <python at bdurham.com> escribi?:

> Is there a way to programmatically discover the encoding types
> supported by the codecs module?
>
> For example, the following link shows a table with Codec,
> Aliases, and Language columns.
> http://docs.python.org/library/codecs.html#standard-encodings
>
> I'm looking for a way to programmatically generate this table
> through some form of module introspection.

After looking at how things are done in codecs.c and encodings/__init__.py  
I think you should enumerate all modules in the encodings package that  
define a getregentry function.
Aliases come from encodings.aliases.aliases.

-- 
Gabriel Genellina



From wolfgang.lipp at gmail.com  Wed Mar 24 13:44:13 2010
From: wolfgang.lipp at gmail.com (_wolf)
Date: Wed, 24 Mar 2010 10:44:13 -0700 (PDT)
Subject: Is it possible to use re2 from Python?
References: <f853ea28-b236-4a17-8ded-43e5fe455d47@a18g2000yqc.googlegroups.com>
Message-ID: <ad7e9ab9-8b5e-4391-9552-9a006bf058ad@i25g2000yqm.googlegroups.com>


yes we can! http://github.com/facebook/pyre2

as pointed out by http://stackoverflow.com/users/219162/daniel-stutzbach

now gotta go and try it out.


From wolfgang.lipp at gmail.com  Wed Mar 24 13:47:22 2010
From: wolfgang.lipp at gmail.com (_wolf)
Date: Wed, 24 Mar 2010 10:47:22 -0700 (PDT)
Subject: how to do asynchronous http requests with epoll and python 3.1
Message-ID: <031f3a5b-28ac-42f0-a6a8-2cb7998cad6d@q16g2000yqq.googlegroups.com>


i asked this question before on
http://stackoverflow.com/questions/2489780/how-to-do-asynchronous-http-requests-with-epoll-and-python-3-1
but without a definitive answer as yet.

can someone help me out? i want to do several simple http GET and POST
requests in the same process using Python 3.1 without using threading.


the original post:

there is an interesting page [http://scotdoyle.com/python-epoll-
howto.html][1] about how to do asnchronous / non-blocking / AIO http
serving in python 3.

there is the [tornado web server][2] which does include a non-blocking
http client. i have managed to port parts of the server to python 3.1,
but the implementation of the client requires [pyCurl][3] and [seems
to have problems][4] (with one participant stating how ?Libcurl is
such a pain in the neck?, and looking at the incredibly ugly pyCurl
page i doubt pyCurl will arrive in py3+ any time soon).

now that epoll is available in the standard library, it should be
possible to do asynchronous http requests out of the box with python.
i really do not want to use asyncore or whatnot; epoll has a
reputation for being the ideal tool for the task, and it is part of
the python distribution, so using anything but epoll for non-blocking
http is highly counterintuitive (prove me wrong if you feel like it).

oh, and i feel threading is horrible. no threading. i use [stackless]
[5].

*people further interested in the topic of asynchronous http should
not miss out on this [talk by peter portante at PyCon2010][6]; also of
interest is [the keynote][7], where speaker antonio rodriguez at one
point emphasizes the importance of having up-to-date web technology
libraries right in the standard library.*


  [1]: http://scotdoyle.com/python-epoll-howto.html
  [2]: http://www.tornadoweb.org/
  [3]: http://pycurl.sourceforge.net/
  [4]:
http://groups.google.com/group/python-tornado/browse_thread/thread/276059a076593266/c49e8f834497271e?lnk=gst&q=httpclient+trouble+with+epoll#c49e8f834497271e
  [5]: http://stackless.com/
  [6]: http://python.mirocommunity.org/video/1501/pycon-2010-demystifying-non-bl
  [7]: http://python.mirocommunity.org/video/1605/pycon-2010-keynote-relentlessl


From python at bdurham.com  Wed Mar 24 13:55:32 2010
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 24 Mar 2010 13:55:32 -0400
Subject: Programmatically discovering encoding types supported by codecs
	module
In-Reply-To: <ec96e1391003241018y136a4791odba7402b0ad3f95c@mail.gmail.com>
References: <1269447436.19612.1366507993@webmail.messagingengine.com>
	<ec96e1391003241018y136a4791odba7402b0ad3f95c@mail.gmail.com>
Message-ID: <1269453332.6801.1366527617@webmail.messagingengine.com>

Benjamin,

> According to my brief messing around with the REPL, encodings.aliases.aliases is a good place to start. I don't know of any way to get the Language column, but at the very least that will give you most of the supported encodings and any aliases they have.

Thank you - that's exactly the type of information I was looking for.

I'm including the following for anyone browsing the mailing list
archives in the future.

Here's the snippet we're using to dynamically generate the codec
documentation posted on the docs.python website.

import encodings
encodingDict = encodings.aliases.aliases
encodingType = dict()
for key, value in encodingDict.items():
    if value not in encodingType:
        encodingType[ value ] = list()
    encodingType[ value ].append( key )

for key in sorted( encodingType.keys() ):
    aliases = sorted( encodingType[ key ] )
    aliases = ', '.join( aliases )
    print '%-20s%s' % ( key, aliases )

Regards,
Malcolm


From python at bdurham.com  Wed Mar 24 13:58:47 2010
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 24 Mar 2010 13:58:47 -0400
Subject: Programmatically discovering encoding types supported by codecs 
	module
In-Reply-To: <op.u921zuyjx6zn5v@gabriel.sleipnir-bsas>
References: <1269447436.19612.1366507993@webmail.messagingengine.com>
	<op.u921zuyjx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <1269453527.7192.1366528303@webmail.messagingengine.com>

Gabriel,

> After looking at how things are done in codecs.c and encodings/__init__.py  I think you should enumerate all modules in the encodings package that define a getregentry function. Aliases come from encodings.aliases.aliases.

Thanks for looking into this for me. Benjamin Kaplan made a similar
observation. My reply to him included the snippet of code we're using to
generate the actual list of encodings that our software will support
(thanks to Python's codecs and encodings modules).

Your help is always appreciated :)

Regards,
Malcolm


----- Original message -----
From: "Gabriel Genellina" <gagsl-py2 at yahoo.com.ar>
To: python-list at python.org
Date: Wed, 24 Mar 2010 14:39:20 -0300
Subject: Re: Programmatically discovering encoding types supported by
codecs    module

En Wed, 24 Mar 2010 13:17:16 -0300, <python at bdurham.com> escribi?:

> Is there a way to programmatically discover the encoding types
> supported by the codecs module?
>
> For example, the following link shows a table with Codec,
> Aliases, and Language columns.
> http://docs.python.org/library/codecs.html#standard-encodings
>
> I'm looking for a way to programmatically generate this table
> through some form of module introspection.


-- 
Gabriel Genellina

-- 
http://mail.python.org/mailman/listinfo/python-list



From joncle at googlemail.com  Wed Mar 24 14:13:11 2010
From: joncle at googlemail.com (Jon Clements)
Date: Wed, 24 Mar 2010 11:13:11 -0700 (PDT)
Subject: Advice needed on parallel processing in python
References: <0a050a71-8ff1-4393-aba9-9115eb38cbec@q21g2000yqm.googlegroups.com>
Message-ID: <ffc29248-7f1f-4bb7-85c8-f118806fd7d4@e7g2000yqf.googlegroups.com>

On 24 Mar, 15:27, Glazner <yoavglaz... at gmail.com> wrote:
> Hi!
>
> I need to replace an app that does number crunching over a local
> network.
> it have about 50 computers as slaves
> each computer needs to run COM that will do the "job"
> right now the system uses MFC threads and DCOM to distribute the load.
>
> as i said, Now i'm trying to replace this system with python.
> I already use win32all and read about Pareller Python and Pyro.
>
> a requirement is that messages can be sent to the remote worker.
>
> If anyone can share experience I'll love to hear
>
> Many Thanks,
> Yoav Glazner

Would Celery suit? http://celeryproject.org/

hth

Jon.


From anand.shashwat at gmail.com  Wed Mar 24 14:17:55 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Wed, 24 Mar 2010 23:47:55 +0530
Subject: Advice needed on parallel processing in python
In-Reply-To: <ffc29248-7f1f-4bb7-85c8-f118806fd7d4@e7g2000yqf.googlegroups.com>
References: <0a050a71-8ff1-4393-aba9-9115eb38cbec@q21g2000yqm.googlegroups.com>
	<ffc29248-7f1f-4bb7-85c8-f118806fd7d4@e7g2000yqf.googlegroups.com>
Message-ID: <d4ab53de1003241117r13363510l83e5c8a745314b0d@mail.gmail.com>

have you checked hadoop ?

On Wed, Mar 24, 2010 at 11:43 PM, Jon Clements <joncle at googlemail.com>wrote:

> On 24 Mar, 15:27, Glazner <yoavglaz... at gmail.com> wrote:
> > Hi!
> >
> > I need to replace an app that does number crunching over a local
> > network.
> > it have about 50 computers as slaves
> > each computer needs to run COM that will do the "job"
> > right now the system uses MFC threads and DCOM to distribute the load.
> >
> > as i said, Now i'm trying to replace this system with python.
> > I already use win32all and read about Pareller Python and Pyro.
> >
> > a requirement is that messages can be sent to the remote worker.
> >
> > If anyone can share experience I'll love to hear
> >
> > Many Thanks,
> > Yoav Glazner
>
> Would Celery suit? http://celeryproject.org/
>
> hth
>
> Jon.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From nagle at animats.com  Wed Mar 24 15:35:27 2010
From: nagle at animats.com (John Nagle)
Date: Wed, 24 Mar 2010 12:35:27 -0700
Subject: Unicode blues in Python3
In-Reply-To: <0250ffe0-0bb0-4cb2-8c3e-6446fb51b0b8@r27g2000yqn.googlegroups.com>
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
	<mailman.1099.1269367884.23598.python-list@python.org>
	<3a428b39-bab1-48f2-b7df-560a849b8883@d27g2000yqf.googlegroups.com>
	<mailman.1101.1269374267.23598.python-list@python.org>
	<c75d1abb-2674-4c67-9701-38946b5db58f@l25g2000yqd.googlegroups.com>
	<4BA943E7.5000202@v.loewis.de>
	<0250ffe0-0bb0-4cb2-8c3e-6446fb51b0b8@r27g2000yqn.googlegroups.com>
Message-ID: <4baa64e1$0$1632$742ec2ed@news.sonic.net>

nn wrote:

> To be more informative I am both writing text and binary data
> together. That is I am embedding text from another source into stream
> that uses non-ascii characters as "control" characters. In Python2 I
> was processing it mostly as text containing a few "funny" characters.

    OK.  Then you need to be writing arrays of bytes, not strings.
Encoding is your problem.  This has nothing to do with Unicode.

				John Nagle


From leahy_rich at hotmail.com  Wed Mar 24 16:26:51 2010
From: leahy_rich at hotmail.com (Richard Leahy)
Date: Wed, 24 Mar 2010 22:26:51 +0200
Subject: help sending text to windows edit control
Message-ID: <SNT106-W30AC09BBEB775D2A3030E2F9250@phx.gbl>


I am trying to write text into a windows edit
control using python. it seems to write to every control i try except
the edit box not sure if this is a security measure or not. here is my
code any help please.



import os,sys,subprocess,time


from subprocess import *


from os import *


from ctypes import *


from ctypes.wintypes import *





PROCESS_ALL_ACCESS =     ( 0x000F0000 | 0x00100000 | 0xFFF )


kernel32 = windll.kernel32


pid      = sys.argv[1]





h_process = kernel32.OpenProcess( PROCESS_ALL_ACCESS, False, int(pid) )





if not h_process:


    print "[*] Couldn't acquire a handle to PID: %s" % pid


    sys.exit(0)





user32 = windll.user32


# parent window


window_handle = windll.user32.FindWindowA(None, "Windows App")








if not window_handle:


    print "[*] cant find window"





# 1 is the control id of the edit box child window


#below line has no effect on the control for some reason??


windll.user32.SetDlgItemTextA(window_handle, 1, "test") 





# 2 is the control id of a button


# this line works and changes the button text? not sure whats going on


windll.user32.SetDlgItemTextA(window_handle, 2, "test") 
 		 	   		  
_________________________________________________________________
Hotmail: Free, trusted and rich email service.
https://signup.live.com/signup.aspx?id=60969
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From python at bdurham.com  Wed Mar 24 16:34:59 2010
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 24 Mar 2010 16:34:59 -0400
Subject: Is there a way to detect an environment's "default" encoding type
	(Windows)?
Message-ID: <1269462899.32722.1366552387@webmail.messagingengine.com>

Is there a way to detect an environment's "default" encoding type
under Windows? I'm not sure if code page and encoding mean the
same thing here.

For example: When I use Word on my US based version of Windows
and decide to save a file as text, I am prompted with an encoding
dialog that defaults to 'Windows (default)' which appears maps to
their 'Western European (Windows)' code page which I assume maps
to code page 1252. (That's a lot of assumptions!).

I would like to be able to make the same assumption about text
files produced on a user's system. (Of course our software will
offer a way to explictly specify an encoding format as well).

Here's what I've been able to dig up so far but I'm not sure how
reliable this is or if its the same information Word is looking
at when it offers a default encoding value.

>>> import locale
>>> locale.getdefaultlocale()[1]
'cp1252'

Any ideas?

Malcolm
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From dr.mtarver at ukonline.co.uk  Wed Mar 24 16:50:57 2010
From: dr.mtarver at ukonline.co.uk (Mark Tarver)
Date: Wed, 24 Mar 2010 13:50:57 -0700 (PDT)
Subject: the Python Foundation
Message-ID: <70db60af-cad4-4385-b199-e181f1e39898@b7g2000yqd.googlegroups.com>

>From the website

The Python Software Foundation (PSF) is a 501(c)(3) non-profit
corporation that
holds the intellectual property rights behind the Python programming
language. We manage the open source licensing for Python version 2.1
and later and own and protect the trademarks associated with Python.

Could somebody explain 'what holding the intellectual property rights'
means in this context and in what sense PSF manages the licensing and
protects the trademarks associated with Python?   This is for my
education.

thanks

Mark


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 24 17:07:24 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 24 Mar 2010 21:07:24 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
Message-ID: <pan.2010.03.24.21.07.24@REMOVE.THIS.cybersource.com.au>

On Wed, 24 Mar 2010 15:29:07 +0000, kj wrote:

> Is there a sequence-oriented equivalent to the sum built-in?  E.g.:
> 
>   seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)
> 
> ?

Yes, sum.

help(sum) is your friend.

>>> a = range(2)
>>> b = range(3)
>>> c = range(4)
>>> sum((a, b, c), [])
[0, 1, 0, 1, 2, 0, 1, 2, 3]


Beware though that sum on lists and tuples will be fairly inefficient if 
you have lots of them. You may find that this will be much more efficient:

result = []
for seq in sequences:
    result.extend(seq)



-- 
Steven


From robert.kern at gmail.com  Wed Mar 24 17:09:09 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 24 Mar 2010 16:09:09 -0500
Subject: the Python Foundation
In-Reply-To: <70db60af-cad4-4385-b199-e181f1e39898@b7g2000yqd.googlegroups.com>
References: <70db60af-cad4-4385-b199-e181f1e39898@b7g2000yqd.googlegroups.com>
Message-ID: <hodv1m$fbt$1@dough.gmane.org>

On 2010-03-24 15:50 PM, Mark Tarver wrote:
>> From the website
>
> The Python Software Foundation (PSF) is a 501(c)(3) non-profit
> corporation that
> holds the intellectual property rights behind the Python programming
> language. We manage the open source licensing for Python version 2.1
> and later and own and protect the trademarks associated with Python.
>
> Could somebody explain 'what holding the intellectual property rights'
> means in this context and in what sense PSF manages the licensing and
> protects the trademarks associated with Python?   This is for my
> education.

The PSF owns the Python language trademark:

   http://tess2.uspto.gov/bin/showfield?f=doc&state=4007:oc64of.5.1

Its trademark policy is given in detail here:

   http://www.python.org/psf/trademarks/

It also controls the license of the Python interpreter and its surrounding code. 
Contributors license their code to the PSF. Contributors keep the copyright to 
their code, but they agree to give the PSF the right to distribute it under a 
different license if the PSF decides to change licenses. See the Contributor 
Agreement:

   http://www.python.org/psf/contrib/contrib-form/

I believe they also outright own the copyright to most of the code that was in 
the Python 2.1 release and up until this Contributor Agreement was set up. I 
could be wrong about that, though.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From mehgcap at gmail.com  Wed Mar 24 17:12:45 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Wed, 24 Mar 2010 17:12:45 -0400
Subject: timers not canceling!
Message-ID: <bc7f680c1003241412s21753048k9f8cb16557c5e896@mail.gmail.com>

Hi all,
I am having trouble with a timer I am trying to use. It is the same
timer, but I need to cancel it when a certain event happens, then
start it again when a second event happens. The below is from a shell
session, not a file, but it shows my problem: I call cancel on a
timer, then call start on it, and it thinks it is already running?
What am I missing?

>>> from threading import Timer
>>> def func():
...  print("Time up!")
...
>>> t=Timer(10.0, func)
>>> t.start()
>>> t.cancel()
>>> t.start()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\python26\lib\threading.py", line 465, in start
    raise RuntimeError("thread already started")
RuntimeError: thread already started
>>>

I typed start, then typed cancel within ten seconds (probably four or
five), then called start again a couple seconds later. I figured
canceling the timer would kill the thread so I could start it again. I
am not looking for a reset, since I do not want it counting always.
Thanks.
-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From chairman at python.org  Wed Mar 24 17:18:39 2010
From: chairman at python.org (Steve Holden, Chairman, PSF)
Date: Wed, 24 Mar 2010 17:18:39 -0400
Subject: the Python Foundation
In-Reply-To: <70db60af-cad4-4385-b199-e181f1e39898@b7g2000yqd.googlegroups.com>
References: <70db60af-cad4-4385-b199-e181f1e39898@b7g2000yqd.googlegroups.com>
Message-ID: <4BAA81AF.1010308@python.org>

Mark Tarver wrote:
>>From the website
> 
> The Python Software Foundation (PSF) is a 501(c)(3) non-profit
> corporation that
> holds the intellectual property rights behind the Python programming
> language. We manage the open source licensing for Python version 2.1
> and later and own and protect the trademarks associated with Python.
> 
> Could somebody explain 'what holding the intellectual property rights'
> means in this context and in what sense PSF manages the licensing and
> protects the trademarks associated with Python?   This is for my
> education.
> 
The PSF requires that contributors sign an agreement licensing their
code to us, and allowing us to distribute it under the license of our
choosing (this does not in any way preclude the contributor licensing
the same code to any other party under different terms).

In this way people who use Python can be relatively sure that the code
is untrammeled by claims of copyright or patent by anyone other than the
PSF, and can therefore use it without fear of losing their rights to do
so because of legal action by third parties.

We have also registered the trademark "Python" for use in reference to
computer programming languages, thereby ensuring that we can take action
should some ill-advised individual or organization decide to produce
another language with "Python" in its name which we did not feel
conformed sufficiently strictly to the language definition, for instance.

The PSF has an established policy with regard to the use of its
trademarks, which you can read at

  http://www.python.org/psf/trademarks/

regards
 Steve
-- 
Steve Holden        Chairman, Python Software Foundation
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/


From steve at holdenweb.com  Wed Mar 24 17:36:20 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 24 Mar 2010 17:36:20 -0400
Subject: timers not canceling!
In-Reply-To: <bc7f680c1003241412s21753048k9f8cb16557c5e896@mail.gmail.com>
References: <bc7f680c1003241412s21753048k9f8cb16557c5e896@mail.gmail.com>
Message-ID: <4BAA85D4.8050405@holdenweb.com>

Alex Hall wrote:
> Hi all,
> I am having trouble with a timer I am trying to use. It is the same
> timer, but I need to cancel it when a certain event happens, then
> start it again when a second event happens. The below is from a shell
> session, not a file, but it shows my problem: I call cancel on a
> timer, then call start on it, and it thinks it is already running?
> What am I missing?
> 
>>>> from threading import Timer
>>>> def func():
> ...  print("Time up!")
> ...
>>>> t=Timer(10.0, func)
>>>> t.start()
>>>> t.cancel()
>>>> t.start()
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "C:\python26\lib\threading.py", line 465, in start
>     raise RuntimeError("thread already started")
> RuntimeError: thread already started
> 
> I typed start, then typed cancel within ten seconds (probably four or
> five), then called start again a couple seconds later. I figured
> canceling the timer would kill the thread so I could start it again. I
> am not looking for a reset, since I do not want it counting always.
> Thanks.

I believe you'll need to create a new Timer each time you need one - a
Timer is a threading.thread, and these can only be started once.

"thread already started" implies that the thread is running, but you
actually get the same message if you try to start any terminated thread
(including a canceled one), so "threads cannot be restarted" might be a
better message.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/


From steve at holdenweb.com  Wed Mar 24 17:36:20 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 24 Mar 2010 17:36:20 -0400
Subject: timers not canceling!
In-Reply-To: <bc7f680c1003241412s21753048k9f8cb16557c5e896@mail.gmail.com>
References: <bc7f680c1003241412s21753048k9f8cb16557c5e896@mail.gmail.com>
Message-ID: <4BAA85D4.8050405@holdenweb.com>

Alex Hall wrote:
> Hi all,
> I am having trouble with a timer I am trying to use. It is the same
> timer, but I need to cancel it when a certain event happens, then
> start it again when a second event happens. The below is from a shell
> session, not a file, but it shows my problem: I call cancel on a
> timer, then call start on it, and it thinks it is already running?
> What am I missing?
> 
>>>> from threading import Timer
>>>> def func():
> ...  print("Time up!")
> ...
>>>> t=Timer(10.0, func)
>>>> t.start()
>>>> t.cancel()
>>>> t.start()
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "C:\python26\lib\threading.py", line 465, in start
>     raise RuntimeError("thread already started")
> RuntimeError: thread already started
> 
> I typed start, then typed cancel within ten seconds (probably four or
> five), then called start again a couple seconds later. I figured
> canceling the timer would kill the thread so I could start it again. I
> am not looking for a reset, since I do not want it counting always.
> Thanks.

I believe you'll need to create a new Timer each time you need one - a
Timer is a threading.thread, and these can only be started once.

"thread already started" implies that the thread is running, but you
actually get the same message if you try to start any terminated thread
(including a canceled one), so "threads cannot be restarted" might be a
better message.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 24 17:38:08 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 24 Mar 2010 21:38:08 GMT
Subject: timers not canceling!
References: <mailman.1158.1269465169.23598.python-list@python.org>
Message-ID: <pan.2010.03.24.21.38.08@REMOVE.THIS.cybersource.com.au>

On Wed, 24 Mar 2010 17:12:45 -0400, Alex Hall wrote:

> Hi all,
> I am having trouble with a timer I am trying to use. It is the same
> timer, but I need to cancel it when a certain event happens, then start
> it again when a second event happens. The below is from a shell session,
> not a file, but it shows my problem: I call cancel on a timer, then call
> start on it, and it thinks it is already running? What am I missing?
> 
>>>> from threading import Timer
>>>> def func():
> ...  print("Time up!")
> ...
>>>> t=Timer(10.0, func)
>>>> t.start()
>>>> t.cancel()
>>>> t.start()
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "C:\python26\lib\threading.py", line 465, in start
>     raise RuntimeError("thread already started")
> RuntimeError: thread already started


The start method is to start generic threads, not just timers, and 
threads don't support being restarted.

Timers are fairly simple objects: after you start the thread, they just 
wait until the time expires, then run a function. You can cancel them, 
but not pause and restart them.

To do what you are trying to do, you will need to subclass either Timer 
or thread and implement your own logic for pausing or restarting the 
count down.


> I typed start, then typed cancel within ten seconds (probably four or
> five), then called start again a couple seconds later. I figured
> canceling the timer would kill the thread so I could start it again.


That's not how they work. "start" means "start the thread", not "start 
the timer", and threads cannot be restarted.

The documentation is very clear:

"start()
Start the thread?s activity.

It must be called at most once per thread object. It arranges for the 
object?s run() method to be invoked in a separate thread of control."

http://docs.python.org/library/threading.html#thread-objects


-- 
Steven


From martin at v.loewis.de  Wed Mar 24 18:22:01 2010
From: martin at v.loewis.de (Martin v. Loewis)
Date: Wed, 24 Mar 2010 23:22:01 +0100
Subject: RELEASED Python 2.6.5
In-Reply-To: <hoajos028di@drn.newsguy.com>
References: <mailman.990.1269039418.23598.python-list@python.org>
	<hoajos028di@drn.newsguy.com>
Message-ID: <hoe3a9$vj3$1@online.de>

> Is anyone else having trouble with the 2.6.5 Windows x86 installer?

Not me. Run

msiexec /i py...msi /l*v py.log

and inspect py.log for errors (post it to bugs.python.org if you can't
determine the cause of the problems).

Are you using SUBST by any chance?

Regards,
Martin


From gagsl-py2 at yahoo.com.ar  Wed Mar 24 18:50:11 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 24 Mar 2010 19:50:11 -0300
Subject: Programmatically discovering encoding types supported by codecs
	module
References: <1269447436.19612.1366507993@webmail.messagingengine.com>
	<op.u921zuyjx6zn5v@gabriel.sleipnir-bsas>
	<1269453527.7192.1366528303@webmail.messagingengine.com>
Message-ID: <op.u93gdxodx6zn5v@gabriel.sleipnir-bsas>

En Wed, 24 Mar 2010 14:58:47 -0300, <python at bdurham.com> escribi?:

>> After looking at how things are done in codecs.c and  
>> encodings/__init__.py  I think you should enumerate all modules in the  
>> encodings package that define a getregentry function. Aliases come from  
>> encodings.aliases.aliases.
>
> Thanks for looking into this for me. Benjamin Kaplan made a similar
> observation. My reply to him included the snippet of code we're using to
> generate the actual list of encodings that our software will support
> (thanks to Python's codecs and encodings modules).

I was curious as whether both methods would give the same results:

py> modules=set()
py> for name in glob.glob(os.path.join(encodings.__path__[0], "*.py")):
...   name = os.path.basename(name)[:-3]
...   try: mod = __import__("encodings."+name,  
fromlist=['ilovepythonbutsometimesihateit'])
...   except ImportError: continue
...   if hasattr(mod, 'getregentry'):
...     modules.add(name)
...
py> fromalias = set(encodings.aliases.aliases.values())
py> fromalias - modules
set(['tactis'])
py> modules - fromalias
set(['charmap',
      'cp1006',
      'cp737',
      'cp856',
      'cp874',
      'cp875',
      'idna',
      'iso8859_1',
      'koi8_u',
      'mac_arabic',
      'mac_centeuro',
      'mac_croatian',
      'mac_farsi',
      'mac_romanian',
      'palmos',
      'punycode',
      'raw_unicode_escape',
      'string_escape',
      'undefined',
      'unicode_escape',
      'unicode_internal',
      'utf_8_sig'])

There is a missing 'tactis' encoding (?) and about twenty without alias.

-- 
Gabriel Genellina



From no.email at nospam.invalid  Wed Mar 24 19:19:19 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Wed, 24 Mar 2010 16:19:19 -0700
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
Message-ID: <7x1vf91f60.fsf@ruckus.brouhaha.com>

kj <no.email at please.post> writes:
> Is there a sequence-oriented equivalent to the sum built-in?  E.g.:
>   seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)

use itertools.chain for this.  A few people have mentioned that sum will
also work, but I think for that purpose it could have O(n**2)
complexity.


From no.email at nospam.invalid  Wed Mar 24 19:22:17 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Wed, 24 Mar 2010 16:22:17 -0700
Subject: the Python Foundation
References: <70db60af-cad4-4385-b199-e181f1e39898@b7g2000yqd.googlegroups.com>
	<mailman.1159.1269465542.23598.python-list@python.org>
Message-ID: <7xwrx1z4nq.fsf@ruckus.brouhaha.com>

"Steve Holden, Chairman, PSF" <chairman at python.org> writes:
> We have also registered the trademark "Python" for use in reference to
> computer programming languages, thereby ensuring that we can take action
> should some ill-advised individual or organization decide to produce
> another language with "Python" in its name

There has been a Lisp compiler called "Python" for many years:

 http://portal.acm.org/citation.cfm?id=141471.141558


From steve at holdenweb.com  Wed Mar 24 20:26:20 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 24 Mar 2010 20:26:20 -0400
Subject: timers not canceling!
In-Reply-To: <4BAA85D4.8050405@holdenweb.com>
References: <bc7f680c1003241412s21753048k9f8cb16557c5e896@mail.gmail.com>
	<4BAA85D4.8050405@holdenweb.com>
Message-ID: <4BAAADAC.4030603@holdenweb.com>

Steve Holden wrote:
> Alex Hall wrote:
[...]
> "thread already started" implies that the thread is running, but you
> actually get the same message if you try to start any terminated thread
> (including a canceled one), so "threads cannot be restarted" might be a
> better message.
> 
Or, better still, "Threads can only be started once".

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/


From steve at holdenweb.com  Wed Mar 24 20:26:20 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 24 Mar 2010 20:26:20 -0400
Subject: timers not canceling!
In-Reply-To: <4BAA85D4.8050405@holdenweb.com>
References: <bc7f680c1003241412s21753048k9f8cb16557c5e896@mail.gmail.com>
	<4BAA85D4.8050405@holdenweb.com>
Message-ID: <4BAAADAC.4030603@holdenweb.com>

Steve Holden wrote:
> Alex Hall wrote:
[...]
> "thread already started" implies that the thread is running, but you
> actually get the same message if you try to start any terminated thread
> (including a canceled one), so "threads cannot be restarted" might be a
> better message.
> 
Or, better still, "Threads can only be started once".

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From patrickwasp at gmail.com  Wed Mar 24 20:33:35 2010
From: patrickwasp at gmail.com (Waspinator)
Date: Wed, 24 Mar 2010 17:33:35 -0700 (PDT)
Subject: cxfreeze on ubuntu 9.10
Message-ID: <84719a38-3d00-4d46-aa11-f0dca7ace71c@q15g2000yqj.googlegroups.com>

Hi,

I'm trying to compile a python script on Ubuntu 9.10. It uses the gtk
toolkit. I tried to run GUI2EXE for a cxfreeze gui, but even after
installing wxPython in synaptic it still complains about not having
it.

I also tried to use cxfreeze by itself but the file it produces does
not run.

I tried to follow the information at http://cx-freeze.sourceforge.net/cx_Freeze.html

I created a setup.py file that looks like this (from the page)

from cx_Freeze import setup, Executable

setup(
        name = "gtk_test",
        version = "0.1",
        description = "gtk_test",
        executables = [Executable("gtk_test.py")])

and ran:

python setup.py build


When I try to run the executable I get the following error:

../build/exe.linux-i686-2.6/library.zip/gtk/_gtk.py:12:
RuntimeWarning: tp_compare didn't return -1 or -2 for exception
ImportError: could not import gio
ImportError: could not import gio
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/cx_Freeze/initscripts/
Console.py", line 29, in <module>
    exec code in m.__dict__
  File "gtk_test.py", line 274, in <module>
  File "gtk_test.py", line 228, in main
AttributeError: 'module' object has no attribute 'Window'

I was thinking of using the 'copy-dependent-files' option but I'm not
sure how.

Any ideas?

Thanks


From mehgcap at gmail.com  Wed Mar 24 22:31:03 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Wed, 24 Mar 2010 22:31:03 -0400
Subject: threads (specifically timers) and releasing resources
Message-ID: <bc7f680c1003241931v4ec88d15ge5639d96834c1db5@mail.gmail.com>

Okay, I have my program and it has three different modes (there will
be more than that). Each mode will have a timer attached to it. If the
mode remains active and the timer runs out, a function specific to
that mode is called. If that mode is switched away from, however, the
timer is canceled and a new timer is created for the mode to which the
user just switched. My question is: what happens with resources taken
up by previous timers, whether they cancel or execute? I would hate
for my program to run for a long time and slowly build up a massive
list of old threads (timers), taking up resources which should have
been released. Will Python perform GC and completely erase a thread
once it is done, or will it keep hanging around? If the latter, is
there a way to completely destroy a thread? Thanks; Google was not too
helpful on this one!

-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From kurianmthayil at gmail.com  Wed Mar 24 22:59:38 2010
From: kurianmthayil at gmail.com (Kurian Thayil)
Date: Thu, 25 Mar 2010 08:29:38 +0530
Subject: MySQLdb compiled -- Import issue
Message-ID: <1269485978.14968.17.camel@localhost>

Hi All,

I am just a month old with Python and trying to learn CGI with Python. I
was trying to install MySQLdb module in my new CentOS 5.3 box with
Python 2.4.3 default install. I downloaded the tar-ball of MySQLdb
module (MySQL-python-1.2.3c1). Did build as normal user and install as
root. MySQL server version that I'm using is 5.1.41, if that has
anything to do with the error. I then copied, libmysqlclient_r.so.16
library to /usr/lib/ folder and then I am able to import the module as
root user. But cannot do this as normal user.

Now, while doing import MySQLdb as normal user, I get the following
error message. The scripts will be run as apache and hence cannot have
this error. Please check the following output. Also I have attached the
output while doing build and install process.

[kurianmt at server MySQL-python-1.2.3c1]$ python
Python 2.4.3 (#1, Jan 21 2009, 01:10:13) 
[GCC 4.1.2 20071124 (Red Hat 4.1.2-42)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import MySQLdb
/usr/lib/python2.4/site-packages/MySQL_python-1.2.3c1-py2.4-linux-i686.egg/_mysql.py:3: UserWarning: Module _mysql was already imported from /usr/lib/python2.4/site-packages/MySQL_python-1.2.3c1-py2.4-linux-i686.egg/_mysql.pyc, but /opt/downloads/py-modules/MySQL-python-1.2.3c1 is being added to sys.path

It would be a great help if I understand what's going on!!! Thanks in
advance.

Regards,

Kurian Mathew Thayil.
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[kurianmt at server MySQL-python-1.2.3c1]$ python setup.py build
running build
running build_py
creating build
creating build/lib.linux-i686-2.4
copying _mysql_exceptions.py -> build/lib.linux-i686-2.4
creating build/lib.linux-i686-2.4/MySQLdb
copying MySQLdb/__init__.py -> build/lib.linux-i686-2.4/MySQLdb
copying MySQLdb/converters.py -> build/lib.linux-i686-2.4/MySQLdb
copying MySQLdb/connections.py -> build/lib.linux-i686-2.4/MySQLdb
copying MySQLdb/cursors.py -> build/lib.linux-i686-2.4/MySQLdb
copying MySQLdb/release.py -> build/lib.linux-i686-2.4/MySQLdb
copying MySQLdb/times.py -> build/lib.linux-i686-2.4/MySQLdb
creating build/lib.linux-i686-2.4/MySQLdb/constants
copying MySQLdb/constants/__init__.py -> build/lib.linux-i686-2.4/MySQLdb/constants
copying MySQLdb/constants/CR.py -> build/lib.linux-i686-2.4/MySQLdb/constants
copying MySQLdb/constants/FIELD_TYPE.py -> build/lib.linux-i686-2.4/MySQLdb/constants
copying MySQLdb/constants/ER.py -> build/lib.linux-i686-2.4/MySQLdb/constants
copying MySQLdb/constants/FLAG.py -> build/lib.linux-i686-2.4/MySQLdb/constants
copying MySQLdb/constants/REFRESH.py -> build/lib.linux-i686-2.4/MySQLdb/constants
copying MySQLdb/constants/CLIENT.py -> build/lib.linux-i686-2.4/MySQLdb/constants
running build_ext
building '_mysql' extension
creating build/temp.linux-i686-2.4
gcc -pthread -fno-strict-aliasing -DNDEBUG -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i386 -mtune=generic -fasynchronous-unwind-tables -D_GNU_SOURCE -fPIC -fPIC -Dversion_info=(1,2,3,'gamma',1) -D__version__=1.2.3c1 -I/usr/local/include/mysql -I/usr/include/python2.4 -c _mysql.c -o build/temp.linux-i686-2.4/_mysql.o -DUNIV_LINUX -DUNIV_LINUX
In file included from _mysql.c:36:
/usr/local/include/mysql/my_config.h:1050:1: warning: "HAVE_WCSCOLL" redefined
In file included from /usr/include/python2.4/pyconfig.h:4,
                 from /usr/include/python2.4/Python.h:8,
                 from pymemcompat.h:10,
                 from _mysql.c:29:
/usr/include/python2.4/pyconfig-32.h:648:1: warning: this is the location of the previous definition
gcc -pthread -shared build/temp.linux-i686-2.4/_mysql.o -L/usr/local/lib/mysql -lmysqlclient_r -lz -lpthread -lcrypt -lnsl -lm -lpthread -o build/lib.linux-i686-2.4/_mysql.so
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[root at server MySQL-python-1.2.3c1]# python setup.py install
running install
running bdist_egg
running egg_info
writing MySQL_python.egg-info/PKG-INFO
writing top-level names to MySQL_python.egg-info/top_level.txt
writing dependency_links to MySQL_python.egg-info/dependency_links.txt
reading manifest file 'MySQL_python.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'MySQL_python.egg-info/SOURCES.txt'
installing library code to build/bdist.linux-i686/egg
running install_lib
running build_py
copying MySQLdb/release.py -> build/lib.linux-i686-2.4/MySQLdb
running build_ext
creating build/bdist.linux-i686
creating build/bdist.linux-i686/egg
copying build/lib.linux-i686-2.4/_mysql.so -> build/bdist.linux-i686/egg
copying build/lib.linux-i686-2.4/_mysql_exceptions.py -> build/bdist.linux-i686/egg
creating build/bdist.linux-i686/egg/MySQLdb
copying build/lib.linux-i686-2.4/MySQLdb/connections.py -> build/bdist.linux-i686/egg/MySQLdb
creating build/bdist.linux-i686/egg/MySQLdb/constants
copying build/lib.linux-i686-2.4/MySQLdb/constants/CR.py -> build/bdist.linux-i686/egg/MySQLdb/constants
copying build/lib.linux-i686-2.4/MySQLdb/constants/__init__.py -> build/bdist.linux-i686/egg/MySQLdb/constants
copying build/lib.linux-i686-2.4/MySQLdb/constants/REFRESH.py -> build/bdist.linux-i686/egg/MySQLdb/constants
copying build/lib.linux-i686-2.4/MySQLdb/constants/FIELD_TYPE.py -> build/bdist.linux-i686/egg/MySQLdb/constants
copying build/lib.linux-i686-2.4/MySQLdb/constants/FLAG.py -> build/bdist.linux-i686/egg/MySQLdb/constants
copying build/lib.linux-i686-2.4/MySQLdb/constants/ER.py -> build/bdist.linux-i686/egg/MySQLdb/constants
copying build/lib.linux-i686-2.4/MySQLdb/constants/CLIENT.py -> build/bdist.linux-i686/egg/MySQLdb/constants
copying build/lib.linux-i686-2.4/MySQLdb/__init__.py -> build/bdist.linux-i686/egg/MySQLdb
copying build/lib.linux-i686-2.4/MySQLdb/times.py -> build/bdist.linux-i686/egg/MySQLdb
copying build/lib.linux-i686-2.4/MySQLdb/release.py -> build/bdist.linux-i686/egg/MySQLdb
copying build/lib.linux-i686-2.4/MySQLdb/cursors.py -> build/bdist.linux-i686/egg/MySQLdb
copying build/lib.linux-i686-2.4/MySQLdb/converters.py -> build/bdist.linux-i686/egg/MySQLdb
byte-compiling build/bdist.linux-i686/egg/_mysql_exceptions.py to _mysql_exceptions.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/connections.py to connections.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/constants/CR.py to CR.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/constants/__init__.py to __init__.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/constants/REFRESH.py to REFRESH.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/constants/FIELD_TYPE.py to FIELD_TYPE.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/constants/FLAG.py to FLAG.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/constants/ER.py to ER.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/constants/CLIENT.py to CLIENT.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/__init__.py to __init__.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/times.py to times.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/release.py to release.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/cursors.py to cursors.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/converters.py to converters.pyc
creating stub loader for _mysql.so
byte-compiling build/bdist.linux-i686/egg/_mysql.py to _mysql.pyc
creating build/bdist.linux-i686/egg/EGG-INFO
copying MySQL_python.egg-info/PKG-INFO -> build/bdist.linux-i686/egg/EGG-INFO
copying MySQL_python.egg-info/SOURCES.txt -> build/bdist.linux-i686/egg/EGG-INFO
copying MySQL_python.egg-info/dependency_links.txt -> build/bdist.linux-i686/egg/EGG-INFO
copying MySQL_python.egg-info/top_level.txt -> build/bdist.linux-i686/egg/EGG-INFO
writing build/bdist.linux-i686/egg/EGG-INFO/native_libs.txt
zip_safe flag not set; analyzing archive contents...
creating dist
creating 'dist/MySQL_python-1.2.3c1-py2.4-linux-i686.egg' and adding 'build/bdist.linux-i686/egg' to it
removing 'build/bdist.linux-i686/egg' (and everything under it)
Processing MySQL_python-1.2.3c1-py2.4-linux-i686.egg
Removing /usr/lib/python2.4/site-packages/MySQL_python-1.2.3c1-py2.4-linux-i686.egg
Copying MySQL_python-1.2.3c1-py2.4-linux-i686.egg to /usr/lib/python2.4/site-packages
MySQL-python 1.2.3c1 is already the active version in easy-install.pth

Installed /usr/lib/python2.4/site-packages/MySQL_python-1.2.3c1-py2.4-linux-i686.egg
Processing dependencies for MySQL-python==1.2.3c1
Finished processing dependencies for MySQL-python==1.2.3c1
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From half.italian at gmail.com  Wed Mar 24 23:15:00 2010
From: half.italian at gmail.com (Sean DiZazzo)
Date: Wed, 24 Mar 2010 20:15:00 -0700 (PDT)
Subject: MySQLdb compiled -- Import issue
References: <mailman.1166.1269485871.23598.python-list@python.org>
Message-ID: <85161d90-2db8-4bbe-ab13-02f27abab82a@y11g2000prf.googlegroups.com>

On Mar 24, 7:59?pm, Kurian Thayil <kurianmtha... at gmail.com> wrote:
> Hi All,
>
> I am just a month old with Python and trying to learn CGI with Python. I
> was trying to install MySQLdb module in my new CentOS 5.3 box with
> Python 2.4.3 default install. I downloaded the tar-ball of MySQLdb
> module (MySQL-python-1.2.3c1). Did build as normal user and install as
> root. MySQL server version that I'm using is 5.1.41, if that has
> anything to do with the error. I then copied, libmysqlclient_r.so.16
> library to /usr/lib/ folder and then I am able to import the module as
> root user. But cannot do this as normal user.
>
> Now, while doing import MySQLdb as normal user, I get the following
> error message. The scripts will be run as apache and hence cannot have
> this error. Please check the following output. Also I have attached the
> output while doing build and install process.
>
> [kurianmt at server MySQL-python-1.2.3c1]$ python
> Python 2.4.3 (#1, Jan 21 2009, 01:10:13)
> [GCC 4.1.2 20071124 (Red Hat 4.1.2-42)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.>>> import MySQLdb
>
> /usr/lib/python2.4/site-packages/MySQL_python-1.2.3c1-py2.4-linux-i686.egg/_mysql.py:3: UserWarning: Module _mysql was already imported from /usr/lib/python2.4/site-packages/MySQL_python-1.2.3c1-py2.4-linux-i686.egg/_mysql.pyc, but /opt/downloads/py-modules/MySQL-python-1.2.3c1 is being added to sys.path
>
> It would be a great help if I understand what's going on!!! Thanks in
> advance.
>
> Regards,
>
> Kurian Mathew Thayil.
>
> ?MySQLdb-build.txt
> 3KViewDownload
>
> ?MySQLdb-Install.txt
> 6KViewDownload
>
> ?signature.asc
> < 1KViewDownload

The warning looks familiar.  Are you running python from the MySQLdb
source directory?  ie.  /opt/downloads/py-modules/MySQL-python-1.2.3c1

I think you just need to change directories and the warning will go
away.  Check what's happening on line 3 of _mysql.py  I don't have the
source in front of me.

~Sean


From aharrisreid at googlemail.com  Wed Mar 24 23:17:52 2010
From: aharrisreid at googlemail.com (Alan Harris-Reid)
Date: Thu, 25 Mar 2010 03:17:52 +0000
Subject: Super() function
Message-ID: <4BAAD5E0.9050604@googlemail.com>

Hi,

Using Python 3.1, I sometimes use the super() function to call the 
equivalent method from a parent class, for example

def mymethod(self):
    super().mymethod()
    some more code...

Is there any way of writing the code so that the super() call is generic 
and automatically recognises the name of the current method (ie. 
something like super().thismethod()) or do I always have to repeat the 
method name after super()?

TIA,
Alan


From littlesweetmelon at gmail.com  Wed Mar 24 23:28:58 2010
From: littlesweetmelon at gmail.com (=?GB2312?B?zPC5zw==?=)
Date: Thu, 25 Mar 2010 11:28:58 +0800
Subject: Is there any library for indexing binary data?
Message-ID: <cdb837ea1003242028u7047f346l7d4f405b609b01ff@mail.gmail.com>

Howdy,

Recently, I am finding a good library for build index on binary data.
Xapian & Lucene for python binding focus on text digestion rather than
binary data. Could anyone give me some recommendation? Is there any
library for indexing binary data no matter whether it is written in
python?

In my case, there is a very big datatable which stores structured
binary data, eg:
struct Item
{
    long id; // used as key
    double value;
};

I want to build the index on "id" field to speed on searching. Since
this datatable is not constant, the library should support incremental
indexing. If there is no suitable library, I have to do the index by
myself...

Thank you in advance.

--
ShenLei


From timr at probo.com  Wed Mar 24 23:41:25 2010
From: timr at probo.com (Tim Roberts)
Date: Wed, 24 Mar 2010 20:41:25 -0700
Subject: device identification
References: <9c7ed2c8-f04b-4302-a4be-bde1628ef966@y11g2000prf.googlegroups.com>
	<46ggq59e49qpna7f9ae6q8ftobhot351un@4ax.com>
	<57c86289-85e7-4c9f-b7ed-787687d9a5b6@x23g2000prd.googlegroups.com>
Message-ID: <mkmlq5ti6mu1s2hibjsskl9gdbqtshhfhm@4ax.com>

Omer Ihsan <omrihsan at gmail.com> wrote:
>
>VID and PID is fair enough. now what i want is that i have a threaded
>code that threads two functions to run at the same time. i want each
>function to run seperate devices. the problem is if it doesnt identify
>the attached devices it might run the code on a single device which
>isnt what is required.

Some of the libraries that pyusb uses are not thread-safe, like libusb 0.1.

>how will i be able to run a code on a device of my choice???....you
>can leave away the threading part for now.

You can return all of the devices with a particular VID and PID:

    collection = usb.core.find( find_all=True, idVendor=0x1234,
idProduct=0x5678 )

Then you can dish those out to threads using something like the queue
module.

Or, usb.core.find accepts a predicate function that allows you to use any
criteria you wish.

What kind of device are you trying to manipulate?  I have a lot of USB
experience -- perhaps I can offer advice.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From kurianmthayil at gmail.com  Wed Mar 24 23:41:26 2010
From: kurianmthayil at gmail.com (Kurian Thayil)
Date: Thu, 25 Mar 2010 09:11:26 +0530
Subject: MySQLdb compiled -- Import issue
In-Reply-To: <85161d90-2db8-4bbe-ab13-02f27abab82a@y11g2000prf.googlegroups.com>
References: <mailman.1166.1269485871.23598.python-list@python.org>
	<85161d90-2db8-4bbe-ab13-02f27abab82a@y11g2000prf.googlegroups.com>
Message-ID: <1269488486.14968.22.camel@localhost>



On Wed, 2010-03-24 at 20:15 -0700, Sean DiZazzo wrote:

> On Mar 24, 7:59 pm, Kurian Thayil <kurianmtha... at gmail.com> wrote:
> > Hi All,
> >
> > I am just a month old with Python and trying to learn CGI with Python. I
> > was trying to install MySQLdb module in my new CentOS 5.3 box with
> > Python 2.4.3 default install. I downloaded the tar-ball of MySQLdb
> > module (MySQL-python-1.2.3c1). Did build as normal user and install as
> > root. MySQL server version that I'm using is 5.1.41, if that has
> > anything to do with the error. I then copied, libmysqlclient_r.so.16
> > library to /usr/lib/ folder and then I am able to import the module as
> > root user. But cannot do this as normal user.
> >
> > Now, while doing import MySQLdb as normal user, I get the following
> > error message. The scripts will be run as apache and hence cannot have
> > this error. Please check the following output. Also I have attached the
> > output while doing build and install process.
> >
> > [kurianmt at server MySQL-python-1.2.3c1]$ python
> > Python 2.4.3 (#1, Jan 21 2009, 01:10:13)
> > [GCC 4.1.2 20071124 (Red Hat 4.1.2-42)] on linux2
> > Type "help", "copyright", "credits" or "license" for more information.>>> import MySQLdb
> >
> > /usr/lib/python2.4/site-packages/MySQL_python-1.2.3c1-py2.4-linux-i686.egg/_mysql.py:3: UserWarning: Module _mysql was already imported from /usr/lib/python2.4/site-packages/MySQL_python-1.2.3c1-py2.4-linux-i686.egg/_mysql.pyc, but /opt/downloads/py-modules/MySQL-python-1.2.3c1 is being added to sys.path
> >
> > It would be a great help if I understand what's going on!!! Thanks in
> > advance.
> >
> > Regards,
> >
> > Kurian Mathew Thayil.
> >
> >  MySQLdb-build.txt
> > 3KViewDownload
> >
> >  MySQLdb-Install.txt
> > 6KViewDownload
> >
> >  signature.asc
> > < 1KViewDownload
> 
> The warning looks familiar.  Are you running python from the MySQLdb
> source directory?  ie.  /opt/downloads/py-modules/MySQL-python-1.2.3c1
> 
> I think you just need to change directories and the warning will go
> away.  Check what's happening on line 3 of _mysql.py  I don't have the
> source in front of me.
> 
> ~Sean


Hi Sean,

You are right. I was trying to import the module sitting on the source
folder :"-). Thanks for your quick response and let me try further. 

Regards,

Kurian Mathew Thayil.
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From ysj.ray at gmail.com  Wed Mar 24 23:42:41 2010
From: ysj.ray at gmail.com (=?UTF-8?B?5bKz5biF5p2w?=)
Date: Thu, 25 Mar 2010 11:42:41 +0800
Subject: Super() function
In-Reply-To: <4BAAD5E0.9050604@googlemail.com>
References: <4BAAD5E0.9050604@googlemail.com>
Message-ID: <797c8cbd1003242042s32ee16bbxe6d937a16ab35a50@mail.gmail.com>

Hi:

On 25 March 2010 11:17, Alan Harris-Reid <aharrisreid at googlemail.com> wrote:

> Hi,
>
> Using Python 3.1, I sometimes use the super() function to call the
> equivalent method from a parent class, for example
>
> def mymethod(self):
>   super().mymethod()
>   some more code...
>
> Is there any way of writing the code so that the super() call is generic
> and automatically recognises the name of the current method (ie. something
> like super().thismethod()) or do I always have to repeat the method name
> after super()?
>
> TIA,
> Alan
> --
> http://mail.python.org/mailman/listinfo/python-list
>



   I think, the super() method is designed to delegate any method call to
one of the class in its mro list, and the super() function its self return a
'super' object, so it is better to write what method you want to delegate,
maybe it's not the current method.

-- 
Best wishes from Ray ...
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From wuwei23 at gmail.com  Wed Mar 24 23:47:19 2010
From: wuwei23 at gmail.com (alex23)
Date: Wed, 24 Mar 2010 20:47:19 -0700 (PDT)
Subject: Super() function
References: <mailman.1167.1269487078.23598.python-list@python.org>
Message-ID: <4cb1beeb-a663-46e0-bedb-63e076b7f32c@h35g2000pri.googlegroups.com>

Alan Harris-Reid <aharrisr... at googlemail.com> wrote:
> Is there any way of writing the code so that the super() call is generic
> and automatically recognises the name of the current method (ie.
> something like super().thismethod()) or do I always have to repeat the
> method name after super()?

To the best of my knowledge, you always need to repeat the method
name. super() returns a proxy object that has no awareness of its
context, so it's unaware of the method it's being called within (in
fact, there's nothing that restricts super() to only being used in
methods...).

You could probably write a wrapper function that uses inspect to
determine in which context super() is being called, but unless you're
regularly finding this to be a problem with refactoring I wouldn't
worry about it.


From half.italian at gmail.com  Wed Mar 24 23:54:49 2010
From: half.italian at gmail.com (Sean DiZazzo)
Date: Wed, 24 Mar 2010 20:54:49 -0700 (PDT)
Subject: MySQLdb compiled -- Import issue
References: <mailman.1166.1269485871.23598.python-list@python.org> 
	<85161d90-2db8-4bbe-ab13-02f27abab82a@y11g2000prf.googlegroups.com> 
	<mailman.1169.1269488374.23598.python-list@python.org>
Message-ID: <e5464a0a-033a-4f84-8eb4-2c77cee25afa@u19g2000prh.googlegroups.com>


> You are right. I was trying to import the module sitting on the source
> folder :"-). Thanks for your quick response and let me try further.


Sweet!  I remember it because it confused the hell out of me on at
least one past occasion.  :)


From gagsl-py2 at yahoo.com.ar  Thu Mar 25 00:00:27 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 25 Mar 2010 01:00:27 -0300
Subject: Super() function
References: <4BAAD5E0.9050604@googlemail.com>
Message-ID: <op.u93uq1jyx6zn5v@gabriel.sleipnir-bsas>

En Thu, 25 Mar 2010 00:17:52 -0300, Alan Harris-Reid  
<aharrisreid at googlemail.com> escribi?:

> Using Python 3.1, I sometimes use the super() function to call the  
> equivalent method from a parent class, for example
>
> def mymethod(self):
>     super().mymethod()
>     some more code...
>
> Is there any way of writing the code so that the super() call is generic  
> and automatically recognises the name of the current method (ie.  
> something like super().thismethod()) or do I always have to repeat the  
> method name after super()?

This recipe does what you want:
http://code.activestate.com/recipes/286195-selfsuper/
(but requires a bit of black magic...)

-- 
Gabriel Genellina



From timr at probo.com  Thu Mar 25 00:14:23 2010
From: timr at probo.com (Tim Roberts)
Date: Wed, 24 Mar 2010 21:14:23 -0700
Subject: Advice Criticism on Python App
References: <de18cb49-b0fd-4862-b9af-3743720e0db6@u19g2000prh.googlegroups.com>
Message-ID: <uholq5peen08i78f968juvhskpedhhnlr3@4ax.com>

Jimbo <nilly16 at yahoo.com> wrote:
>
>class stock:
>    code             = ""
>    purchasePrice    = 0
>    purchaseQuantity = 0
>    price            = []  # list of recent prices
>    recentBid        = []  # list of recent bids for stock
>    recentOffer      = []  # list of recent offers for stock
>    stockVol         = []  # list of stock quantity available on
>market

Using lists as class variables is a very good way to create very surprising
bugs.  Consider the following:

  C:\Dev>type x.py

  class test:
      check = []
      def __init__(self):
          self.check.append(1)

  x = test()
  y = test()
  z = test()
  print x.check
  print y.check
  print z.check

  C:\Dev>x.py
  [1, 1, 1]
  [1, 1, 1]
  [1, 1, 1]

  C:\Dev>

>    def __init__(self):
>        """ Default Constructor """
>        self.code             = ""
>        self.purchasePrice    = 0
>        self.purchaseQuantity = 0
>
>    def constructor(self, stockCode, purPrice, purQuant):
>        """ Constructor """
>        self.code             = stockCode
>        self.purchasePrice    = purPrice
>        self.purchaseQuantity = purQuant

The "constructor" concept here is not very Pythonic.  Why not replace those
both with:

    def __init__(self, stockCode="", purPrice=0, purQuant=0):
        self.code             = stockCode
        self.purchasePrice    = purPrice
        self.purchaseQuantity = purQuant
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From gagsl-py2 at yahoo.com.ar  Thu Mar 25 00:29:07 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 25 Mar 2010 01:29:07 -0300
Subject: Is there any library for indexing binary data?
References: <cdb837ea1003242028u7047f346l7d4f405b609b01ff@mail.gmail.com>
Message-ID: <op.u93v2thgx6zn5v@gabriel.sleipnir-bsas>

En Thu, 25 Mar 2010 00:28:58 -0300, ?? <littlesweetmelon at gmail.com>  
escribi?:

> Recently, I am finding a good library for build index on binary data.
> Xapian & Lucene for python binding focus on text digestion rather than
> binary data. Could anyone give me some recommendation? Is there any
> library for indexing binary data no matter whether it is written in
> python?
>
> In my case, there is a very big datatable which stores structured
> binary data, eg:
> struct Item
> {
>     long id; // used as key
>     double value;
> };
>
> I want to build the index on "id" field to speed on searching. Since
> this datatable is not constant, the library should support incremental
> indexing. If there is no suitable library, I have to do the index by
> myself...

What about a database?

-- 
Gabriel Genellina



From steven at REMOVE.THIS.cybersource.com.au  Thu Mar 25 01:10:06 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 25 Mar 2010 05:10:06 GMT
Subject: Advice Criticism on Python App
References: <de18cb49-b0fd-4862-b9af-3743720e0db6@u19g2000prh.googlegroups.com>
	<uholq5peen08i78f968juvhskpedhhnlr3@4ax.com>
Message-ID: <pan.2010.03.25.05.10.05@REMOVE.THIS.cybersource.com.au>

On Wed, 24 Mar 2010 21:14:23 -0700, Tim Roberts wrote:

> Jimbo <nilly16 at yahoo.com> wrote:
>>
>>class stock:
>>    code             = ""
>>    purchasePrice    = 0
>>    purchaseQuantity = 0
>>    price            = []  # list of recent prices 
>>    recentBid        = []  # list of recent bids for stock
>>    recentOffer      = []  # list of recent offers for stock
>>    stockVol         = []  # list of stock quantity available on market
> 
> Using lists as class variables is a very good way to create very
> surprising bugs.  Consider the following:
[snip]


Don't you think that the class attributes are *supposed* to be shared by 
all instances? In that case the behaviour you show is not a bug at all.


-- 
Steven


From littlesweetmelon at gmail.com  Thu Mar 25 01:53:45 2010
From: littlesweetmelon at gmail.com (=?GB2312?B?zPC5zw==?=)
Date: Thu, 25 Mar 2010 13:53:45 +0800
Subject: Is there any library for indexing binary data?
In-Reply-To: <op.u93v2thgx6zn5v@gabriel.sleipnir-bsas>
References: <cdb837ea1003242028u7047f346l7d4f405b609b01ff@mail.gmail.com>
	<op.u93v2thgx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <cdb837ea1003242253r341c6823q315c6fc6c30239d3@mail.gmail.com>

Well, Database is not proper because 1. the table is very big (~10^9
rows) 2. we should support very fast *simple* query that is to get
value corresponding to single key (~10^7 queries / second).

Currently, I have implemented a specific algorithm to deal with my
problem. However, I want to employ some library to simplify codings,
otherwise I have to write my own code for each big table. It is
possible that, after using indexing library, the program cannot run as
fast as homemade code. But if it can greatly simplify my job and can
provide satisfied speed (eg 10^5~10^6 queries / second), the indexing
library is still a good choice for me.

--
ShenLei

2010/3/25 Gabriel Genellina <gagsl-py2 at yahoo.com.ar>:
> En Thu, 25 Mar 2010 00:28:58 -0300, ?? <littlesweetmelon at gmail.com>
> escribi?:
>
>> Recently, I am finding a good library for build index on binary data.
>> Xapian & Lucene for python binding focus on text digestion rather than
>> binary data. Could anyone give me some recommendation? Is there any
>> library for indexing binary data no matter whether it is written in
>> python?
>>
>> In my case, there is a very big datatable which stores structured
>> binary data, eg:
>> struct Item
>> {
>>    long id; // used as key
>>    double value;
>> };
>>
>> I want to build the index on "id" field to speed on searching. Since
>> this datatable is not constant, the library should support incremental
>> indexing. If there is no suitable library, I have to do the index by
>> myself...
>
> What about a database?
>
> --
> Gabriel Genellina
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From tomf.sessile at gmail.com  Thu Mar 25 02:50:23 2010
From: tomf.sessile at gmail.com (TomF)
Date: Wed, 24 Mar 2010 23:50:23 -0700
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<pan.2010.03.24.21.07.24@REMOVE.THIS.cybersource.com.au>
Message-ID: <2010032423502316807-tomfsessile@gmailcom>

On 2010-03-24 14:07:24 -0700, Steven D'Aprano 
<steven at REMOVE.THIS.cybersource.com.au> said:
> On Wed, 24 Mar 2010 15:29:07 +0000, kj wrote:
> 
>> Is there a sequence-oriented equivalent to the sum built-in?  E.g.:
>> 
>> seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)
>> 
>> ?
> 
> Yes, sum.
> 
> help(sum) is your friend.

You might not want to be so glib.  The sum doc sure doesn't sound like 
it should work on lists.

    Returns the sum of a sequence of numbers (NOT strings) plus the value
    of parameter 'start' (which defaults to 0).

-Tom



From stefan_ml at behnel.de  Thu Mar 25 03:22:30 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Thu, 25 Mar 2010 08:22:30 +0100
Subject: C-API: Extract information from function object
In-Reply-To: <op.u92zosmwx6zn5v@gabriel.sleipnir-bsas>
References: <b7632ea7-5523-4419-bc6b-b07bb2e6a443@g19g2000yqe.googlegroups.com>
	<op.u92zosmwx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <hof2vk$ctc$1@dough.gmane.org>

Gabriel Genellina, 24.03.2010 17:49:
> En Wed, 24 Mar 2010 12:09:27 -0300, moerchendiser2k3 escribi?:
>
>> I have a reference to a function and would like to know how to extract
>> information from a function object.
>>
>> Information I am looking for: line and file where this function is
>> from.
>>
>> PyObject_Call can do this to when I call a function object and
>> something failed so these information are written to the traceback. So
>> any suggestions how to do that?
>
> See the Language Reference; the associated code object holds the file
> and starting line the function comes from.
> The traceback object contains better information (like the line being
> executed instead of the first one). Why don't you use it instead?

Note that this was a follow-up to another recent thread where I managed to 
extract the details from the OP by stoically asking back, especially the 
information that this is not about exception handling but rather about 
reporting incorrect return values.

This is a good example when you need a reason why not to split threads on 
the same subject...

Stefan



From steven at REMOVE.THIS.cybersource.com.au  Thu Mar 25 03:34:51 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 25 Mar 2010 07:34:51 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<pan.2010.03.24.21.07.24@REMOVE.THIS.cybersource.com.au>
	<2010032423502316807-tomfsessile@gmailcom>
Message-ID: <pan.2010.03.25.07.34.50@REMOVE.THIS.cybersource.com.au>

On Wed, 24 Mar 2010 23:50:23 -0700, TomF wrote:

> On 2010-03-24 14:07:24 -0700, Steven D'Aprano
> <steven at REMOVE.THIS.cybersource.com.au> said:
>> On Wed, 24 Mar 2010 15:29:07 +0000, kj wrote:
>> 
>>> Is there a sequence-oriented equivalent to the sum built-in?  E.g.:
>>> 
>>> seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)
>>> 
>>> ?
>> 
>> Yes, sum.
>> 
>> help(sum) is your friend.
> 
> You might not want to be so glib.  The sum doc sure doesn't sound like
> it should work on lists.
> 
>     Returns the sum of a sequence of numbers (NOT strings) plus the
>     value of parameter 'start' (which defaults to 0).


What part of that suggested to you that sum might not be polymorphic? 
Sure, it says numbers (which should be changed, in my opinion), but it 
doesn't specify what sort of numbers -- ints, floats, or custom types 
that have an __add__ method. It also singles out strings as excluded. Why 
would you need to explicitly exclude strings, since they're not numbers, 
if sum *only* works with numbers?

E.g. help(math.sin) could have said this, but doesn't:

    Return the sine of x (NOT a dictionary)

It doesn't need to, because dicts aren't exceptional: sin doesn't work on 
anything *but* numbers. There's no __sin__ method to call on arbitrary 
types.

The fact that sum does single out strings is a clear sign that strings 
are treated as exceptional and suggests strongly that summing arbitrary 
types should work. I'm not saying that help(sum) explicitly states that 
it works with lists (it clearly doesn't), but it does suggest the 
possibility and makes the experiment worth trying.

I'll also note that the Fine Manual makes it even more clear that sum is 
polymorphic:

http://docs.python.org/library/functions.html#sum




-- 
Steven


From moekaveli at gmail.com  Thu Mar 25 03:41:06 2010
From: moekaveli at gmail.com (Dr. Benjamin David Clarke)
Date: Thu, 25 Mar 2010 00:41:06 -0700 (PDT)
Subject: Saving a page loaded using the webbrowser library?
Message-ID: <3b268d9b-0e37-4e19-9f28-9f560edff76b@b30g2000yqd.googlegroups.com>

Does anyone know of a way to save the a loaded web page to file after
opening it with a webbrowser.open() call?

Specifically, what I want to do is get the raw HTML from a web page.
This web page uses Javascript. I need the resulting HTML after the
Javascript has been run. I've seen a lot about trying to get Python to
run Javascript but there doesn't seem to be any promising solution. I
can get the raw HTML that I want by saving the page after it has been
loaded via the webbrowser.open() call. Is there any way to automate
this? Does anyone have any ideas for better approaches to this
problem? I don't need ti to be pretty or anything.


From irmen at -NOSPAM-xs4all.nl  Thu Mar 25 03:58:28 2010
From: irmen at -NOSPAM-xs4all.nl (Irmen de Jong)
Date: Thu, 25 Mar 2010 08:58:28 +0100
Subject: Is there any library for indexing binary data?
In-Reply-To: <mailman.1168.1269487743.23598.python-list@python.org>
References: <mailman.1168.1269487743.23598.python-list@python.org>
Message-ID: <4bab182a$0$22933$e4fe514c@news.xs4all.nl>

On 3/25/10 4:28 AM, ?? wrote:
> Howdy,
>
> Recently, I am finding a good library for build index on binary data.
> Xapian&  Lucene for python binding focus on text digestion rather than
> binary data. Could anyone give me some recommendation? Is there any
> library for indexing binary data no matter whether it is written in
> python?
>
> In my case, there is a very big datatable which stores structured
> binary data, eg:
> struct Item
> {
>      long id; // used as key
>      double value;
> };
>
> I want to build the index on "id" field to speed on searching. Since
> this datatable is not constant, the library should support incremental
> indexing. If there is no suitable library, I have to do the index by
> myself...
>
> Thank you in advance.
>
> --
> ShenLei

Put it into an Sqlite database? Or something else from 
http://docs.python.org/library/persistence.html.
Or maybe http://www.pytables.org/ is more suitable to your needs (never 
used that one myself though).
Or install a bank or 2 of memory in your box and read everything into 
memory in one big hashtable.

Btw if you already have a big datatable in which the data is stored, I'm 
guessing that already is in some form of database format. Can't you 
write something that understands that database format.

But I think you need to provide some more details about your data set.

-irmen


From no.email at nospam.invalid  Thu Mar 25 04:04:23 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Thu, 25 Mar 2010 01:04:23 -0700
Subject: Is there any library for indexing binary data?
References: <cdb837ea1003242028u7047f346l7d4f405b609b01ff@mail.gmail.com>
	<op.u93v2thgx6zn5v@gabriel.sleipnir-bsas>
	<mailman.1173.1269496428.23598.python-list@python.org>
Message-ID: <7xaatwsu7s.fsf@ruckus.brouhaha.com>

?? <littlesweetmelon at gmail.com> writes:
> Well, Database is not proper because 1. the table is very big (~10^9
> rows) 2. we should support very fast *simple* query that is to get
> value corresponding to single key (~10^7 queries / second).

Just one numeric key/value pair in each row?  What's wrong with
universal hashing?

PyJudy might also be of interest:
  http://www.dalkescientific.com/Python/PyJudy.html


From irmen at -NOSPAM-xs4all.nl  Thu Mar 25 04:13:27 2010
From: irmen at -NOSPAM-xs4all.nl (Irmen de Jong)
Date: Thu, 25 Mar 2010 09:13:27 +0100
Subject: Saving a page loaded using the webbrowser library?
In-Reply-To: <3b268d9b-0e37-4e19-9f28-9f560edff76b@b30g2000yqd.googlegroups.com>
References: <3b268d9b-0e37-4e19-9f28-9f560edff76b@b30g2000yqd.googlegroups.com>
Message-ID: <4bab1bad$0$22941$e4fe514c@news.xs4all.nl>

On 3/25/10 8:41 AM, Dr. Benjamin David Clarke wrote:
> Does anyone know of a way to save the a loaded web page to file after
> opening it with a webbrowser.open() call?
>
> Specifically, what I want to do is get the raw HTML from a web page.
> This web page uses Javascript. I need the resulting HTML after the
> Javascript has been run. I've seen a lot about trying to get Python to
> run Javascript but there doesn't seem to be any promising solution. I
> can get the raw HTML that I want by saving the page after it has been
> loaded via the webbrowser.open() call. Is there any way to automate
> this? Does anyone have any ideas for better approaches to this
> problem? I don't need ti to be pretty or anything.

I think I would use an appropriate GUI automation library to simulate 
user interaction with the web browser that you just started, and e.g. 
select the File > Save page as > HTML only  menu option from the browser...

If the javascript heavily modifies the DOM, that might not work however. 
You might need additional tooling such as Web Developer Toolbar for 
Firefox where you then can View Source > View Generated Source.

irmen



From news1234 at free.fr  Thu Mar 25 04:25:06 2010
From: news1234 at free.fr (News123)
Date: Thu, 25 Mar 2010 09:25:06 +0100
Subject: how to display variables down a stackdump when an exception occurred
Message-ID: <4bab1de2$0$19315$426a34cc@news.free.fr>

Hi,

I captured a piece of code with a try except statement:

In the except part I display a stackdump


try:
	domyxmlrpcstuff()
except Exception as e:
    import traceback
    ex_type,ex_value,e_b = sys.exc_info()
    tbstring = traceback.format_exc()
    print '%s%s:%s:%s' % \
        (msg,ex_type,ex_value,tbstring)


The output, that I receive is:
  File "C:\mycode\myrpcclient.py", line 63, in upload_chunk
    rslt = myrpcclient.call()
  File "C:\Python26\lib\xmlrpclib.py", line 1199, in __call__
    return self.__send(self.__name, args)
  File "C:\Python26\lib\xmlrpclib.py", line 1489, in __request
    verbose=self.__verbose
  File "C:\Python26\lib\xmlrpclib.py", line 1253, in request
    return self._parse_response(h.getfile(), sock)
  File "C:\Python26\lib\xmlrpclib.py", line 1387, in _parse_response
    p.feed(response)
  File "C:\Python26\lib\xmlrpclib.py", line 601, in feed
    self._parser.Parse(data, 0)
ExpatError: syntax error: line 1, column 0

In order to understand more I would like to display the value of
data in C:\Python26\lib\xmlrpclib.py", line 601

Is this possible in a non interactive fashion?

This is a generic question about inspecting variables down the stack,
whenever an exception occurs.

I started another thread specifically about displaying the invalid
xmlrpc data.




N


From news1234 at free.fr  Thu Mar 25 04:31:05 2010
From: news1234 at free.fr (News123)
Date: Thu, 25 Mar 2010 09:31:05 +0100
Subject: xpat error in xmlrp client. How to inspect data.
Message-ID: <4bab1f4a$0$25677$426a74cc@news.free.fr>

Hi,

I'm havign a small xmlrpc client, which works normally fine.
(xmlrpc via https)

Sometimes however I receive an Exception about an expat error.


The output, that I receive is:
  File "C:\mycode\myrpcclient.py", line 63, in upload_chunk
    rslt = myrpcclient.call()
  File "C:\Python26\lib\xmlrpclib.py", line 1199, in __call__
    return self.__send(self.__name, args)
  File "C:\Python26\lib\xmlrpclib.py", line 1489, in __request
    verbose=self.__verbose
  File "C:\Python26\lib\xmlrpclib.py", line 1253, in request
    return self._parse_response(h.getfile(), sock)
  File "C:\Python26\lib\xmlrpclib.py", line 1387, in _parse_response
    p.feed(response)
  File "C:\Python26\lib\xmlrpclib.py", line 601, in feed
    self._parser.Parse(data, 0)
ExpatError: syntax error: line 1, column 0


In order to continue debugging I'd like to dump the received http data,
which "C:\Python26\lib\xmlrpclib.py", line 601 tried to parse without
succes.

How can I do this?

thanks for any suggestions


N




From littlesweetmelon at gmail.com  Thu Mar 25 05:28:25 2010
From: littlesweetmelon at gmail.com (=?GB2312?B?zPC5zw==?=)
Date: Thu, 25 Mar 2010 17:28:25 +0800
Subject: Is there any library for indexing binary data?
In-Reply-To: <7xaatwsu7s.fsf@ruckus.brouhaha.com>
References: <cdb837ea1003242028u7047f346l7d4f405b609b01ff@mail.gmail.com>
	<op.u93v2thgx6zn5v@gabriel.sleipnir-bsas>
	<mailman.1173.1269496428.23598.python-list@python.org>
	<7xaatwsu7s.fsf@ruckus.brouhaha.com>
Message-ID: <cdb837ea1003250228i29f836efwef4f85b936020714@mail.gmail.com>

Thank you Rubin! Let me have a look at Judy. It seems good at first glance.

--
ShenLei

2010/3/25 Paul Rubin <no.email at nospam.invalid>:
> ?? <littlesweetmelon at gmail.com> writes:
>> Well, Database is not proper because 1. the table is very big (~10^9
>> rows) 2. we should support very fast *simple* query that is to get
>> value corresponding to single key (~10^7 queries / second).
>
> Just one numeric key/value pair in each row?  What's wrong with
> universal hashing?
>
> PyJudy might also be of interest:
>  http://www.dalkescientific.com/Python/PyJudy.html
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From tim.wintle at teamrubber.com  Thu Mar 25 05:34:17 2010
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 25 Mar 2010 09:34:17 +0000
Subject: Is it possible to use re2 from Python?
In-Reply-To: <ad7e9ab9-8b5e-4391-9552-9a006bf058ad@i25g2000yqm.googlegroups.com>
References: <f853ea28-b236-4a17-8ded-43e5fe455d47@a18g2000yqc.googlegroups.com>
	<ad7e9ab9-8b5e-4391-9552-9a006bf058ad@i25g2000yqm.googlegroups.com>
Message-ID: <1269509657.7610.13.camel@localhost>

On Wed, 2010-03-24 at 10:44 -0700, _wolf wrote:
> yes we can! http://github.com/facebook/pyre2

I had made a thin wrapper experiment with here - looks like the version
he's shipped is relatively complete and compatible with the re module
though.

I'll be interested in seeing how well it performs - The wrapper I had
been experimenting with ended up far slower than the re module for
simple expressions - and the fastest codepaths in RE2 seem to be ones
that are incompatible with the API we're used to using in the re module.

Tim



From littlesweetmelon at gmail.com  Thu Mar 25 05:55:27 2010
From: littlesweetmelon at gmail.com (=?GB2312?B?zPC5zw==?=)
Date: Thu, 25 Mar 2010 17:55:27 +0800
Subject: Is there any library for indexing binary data?
In-Reply-To: <4bab182a$0$22933$e4fe514c@news.xs4all.nl>
References: <mailman.1168.1269487743.23598.python-list@python.org>
	<4bab182a$0$22933$e4fe514c@news.xs4all.nl>
Message-ID: <cdb837ea1003250255u3d08b8f6n3eb5a6c343573920@mail.gmail.com>

Thank you irmen. I will take a look at pytable.
FYI, let me explain the case clearly.

Originally, my big data table is simply array of Item:
struct Item
{
    long id;    // used as key
    BYTE payload[LEN];   // corresponding value with fixed length
};

All items are stored in one file by using "stdio.h" function:
    fwrite(itemarray, sizeof(Item), num_of_items, fp);

Note that "id" is randomly unique without any order. To speed up
searching  I regrouped / sorted them into two-level hash tables (in
the form of files).  I want to employ certain library to help me index
this table.

Since the table contains about 10^9 items and LEN is about 2KB, it is
impossible to hold all data in memory. Furthermore, some new item may
be inserted into the array. Therefore incremental indexing feature is
needed.

Hope this help you to understand my case.

--
ShenLei


2010/3/25 Irmen de Jong <irmen at -nospam-xs4all.nl>:
> On 3/25/10 4:28 AM, ?? wrote:
>>
>> Howdy,
>>
>> Recently, I am finding a good library for build index on binary data.
>> Xapian&  Lucene for python binding focus on text digestion rather than
>> binary data. Could anyone give me some recommendation? Is there any
>> library for indexing binary data no matter whether it is written in
>> python?
>>
>> In my case, there is a very big datatable which stores structured
>> binary data, eg:
>> struct Item
>> {
>>     long id; // used as key
>>     double value;
>> };
>>
>> I want to build the index on "id" field to speed on searching. Since
>> this datatable is not constant, the library should support incremental
>> indexing. If there is no suitable library, I have to do the index by
>> myself...
>>
>> Thank you in advance.
>>
>> --
>> ShenLei
>
> Put it into an Sqlite database? Or something else from
> http://docs.python.org/library/persistence.html.
> Or maybe http://www.pytables.org/ is more suitable to your needs (never used
> that one myself though).
> Or install a bank or 2 of memory in your box and read everything into memory
> in one big hashtable.
>
> Btw if you already have a big datatable in which the data is stored, I'm
> guessing that already is in some form of database format. Can't you write
> something that understands that database format.
>
> But I think you need to provide some more details about your data set.
>
> -irmen
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From mail at timgolden.me.uk  Thu Mar 25 05:57:23 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Thu, 25 Mar 2010 09:57:23 +0000
Subject: threads (specifically timers) and releasing resources
In-Reply-To: <bc7f680c1003241931v4ec88d15ge5639d96834c1db5@mail.gmail.com>
References: <bc7f680c1003241931v4ec88d15ge5639d96834c1db5@mail.gmail.com>
Message-ID: <4BAB3383.7080003@timgolden.me.uk>

On 25/03/2010 02:31, Alex Hall wrote:
> Okay, I have my program and it has three different modes (there will
> be more than that). Each mode will have a timer attached to it. If the
> mode remains active and the timer runs out, a function specific to
> that mode is called. If that mode is switched away from, however, the
> timer is canceled and a new timer is created for the mode to which the
> user just switched.

I assume you're using Python's threading.Timer objects as you'd discussed
those before. If so, that's basically a threading.Thread in disguise.
In which case, you're going to have to make sure it cleans up after itself,
releasing whatever resources it holds.

Python's reference-count semantics and cyclic gc will take care of
things in the normal way once the timer-thread has completed. But
you'll have to make sure it completes.

> If the latter, is there a way to completely destroy a thread?

No: in Python, a thread has to self-destruct. This is a relatively
FAQ and there are quite a few recipes around. Here's an example of
something which seems to be close to your current needs:

http://code.activestate.com/recipes/464959-resettable-timer-class/

TJG


From egbertum at xs4all.nl  Thu Mar 25 06:16:32 2010
From: egbertum at xs4all.nl (egbert)
Date: Thu, 25 Mar 2010 11:16:32 +0100
Subject: from import and __init__.py
Message-ID: <20100325101632.GA4727@xs4all.nl>

When I do 'from some_package import some_module'
the __init__.py of some_package will be run.
However, there will not be anything like a  package-module, 
and the effects of __init__.py seem all to be lost. Is that true ?
Or can I still do something useful with __init__.py ?  
e
-- 
Egbert Bouwman - Keizersgracht 197 II - 1016 DS  Amsterdam - 020 6257991
========================================================================


From rami.chowdhury at gmail.com  Thu Mar 25 07:10:33 2010
From: rami.chowdhury at gmail.com (Rami Chowdhury)
Date: Thu, 25 Mar 2010 04:10:33 -0700
Subject: the Python Foundation
In-Reply-To: <7xwrx1z4nq.fsf@ruckus.brouhaha.com>
References: <70db60af-cad4-4385-b199-e181f1e39898@b7g2000yqd.googlegroups.com>
	<mailman.1159.1269465542.23598.python-list@python.org>
	<7xwrx1z4nq.fsf@ruckus.brouhaha.com>
Message-ID: <20100325111033.GB18576@tigris>

On 2010-03-24 16:22, Paul Rubin wrote:
> "Steve Holden, Chairman, PSF" <chairman at python.org> writes:
> > We have also registered the trademark "Python" for use in reference to
> > computer programming languages, thereby ensuring that we can take action
> > should some ill-advised individual or organization decide to produce
> > another language with "Python" in its name
> 
> There has been a Lisp compiler called "Python" for many years:
> 
>  http://portal.acm.org/citation.cfm?id=141471.141558

The FAQ disclaims any connection and claims that Python the Lisp
compiler has been around longer than Python the language...

http://www.cons.org/cmucl/FAQ.html

I was awfully confused the first time I came across SBCL giving me warnings
about Python, though -- proves how well the PSF has safeguarded the name!

> -- 
> http://mail.python.org/mailman/listinfo/python-list


From newton10471 at gmail.com  Thu Mar 25 07:42:08 2010
From: newton10471 at gmail.com (newton10471)
Date: Thu, 25 Mar 2010 04:42:08 -0700 (PDT)
Subject: chroot fails with mount point passed to subprocess.Popen?
References: <6a601e7c-7a89-4747-a25c-a78743fe47ab@g4g2000yqa.googlegroups.com>
	<ho7rjf$lki$1@news.eternal-september.org>
Message-ID: <0bbff19b-1cb1-40bb-950c-7594d0eba6cc@r1g2000yqj.googlegroups.com>

Hi Alf,

After doing some more research, including the character-by-character
comparison you suggested (thank you!), I was able to get things
working the way I wanted using the following:

def getInstalledKernelVersion(mountPoint):
    linuxFsRoot = mountPoint + "/root"
    installedKernelVersionResult = subprocess.Popen(['/usr/sbin/
chroot',linuxFsRoot,'/bin/rpm','-q','kernel-xen'],
stdout=subprocess.PIPE).communicate()[0]
    return installedKernelVersionResult


Thanks very much for you help,

-Matt


On Mar 22, 9:33?am, "Alf P. Steinbach" <al... at start.no> wrote:
> * newton10471:
>
>
>
> > Hi,
>
> > I'm trying to use subprocess.Popen() to do a Linux chroot to a mount
> > point passed in as a parameter to the following function:
>
> > def getInstalledKernelVersion(mountPoint):
> > ? ? linuxFsRoot = mountPoint + "/root"
> > ? ? print "type of linuxFsRoot is %s" % type(linuxFsRoot)
> > ? ? installedKernelVersionResult =
> > subprocess.Popen(['chroot',linuxFsRoot,'rpm','-q','kernel-xen'])
> > ? ? return installedKernelVersionResult
>
> > and it dies with the following:
>
> > type of linuxFsRoot is <type 'str'>
> > chroot: cannot change root directory to /storage/mounts/
> > mnt_3786314034939740895.mnt/root: No such file or directory
>
> > When I explicitly set linuxFsRoot = "/storage/mounts/
> > mnt_3786314034939740895.mnt/root", it works fine.
>
> > I also tried this to concatenate the mountpoint + /root, and it failed
> > in the same way:
>
> > linuxFsRoot = ("%s/root") % mountPoint
>
> Use the os.path functions.
>
> > Anyone know what might be happening here?
>
> Since the computed and literal paths /look/ identical and same type, the only
> thing I can imagine is that there is some invisible character. Try comparing the
> computed and literal path character by character. Print the difference or if
> they're identical, that they are.
>
> Possibly you have GIGO problem.
>
> Cheers & hth.,
>
> - Alf



From steve at holdenweb.com  Thu Mar 25 07:42:20 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 25 Mar 2010 07:42:20 -0400
Subject: from import and __init__.py
In-Reply-To: <20100325101632.GA4727@xs4all.nl>
References: <20100325101632.GA4727@xs4all.nl>
Message-ID: <hofi7f$u0f$1@dough.gmane.org>

egbert wrote:
> When I do 'from some_package import some_module'
> the __init__.py of some_package will be run.
> However, there will not be anything like a  package-module, 
> and the effects of __init__.py seem all to be lost. Is that true ?
> Or can I still do something useful with __init__.py ?  
> e

If I understand correctly what you mean byt a "package-module" then
__init__.py is exactly what you are looking for.

Many packages are built with an empty __init__.py because they are
intended mostly to build a tree-like set of namespaces, but __init__.py
*is* run when the package is imported, and its namespace is bound to the
name of the package within the importing program. So if you have code
you want to run when the package is imported, put it there.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From newton10471 at gmail.com  Thu Mar 25 07:42:22 2010
From: newton10471 at gmail.com (newton10471)
Date: Thu, 25 Mar 2010 04:42:22 -0700 (PDT)
Subject: chroot fails with mount point passed to subprocess.Popen?
References: <6a601e7c-7a89-4747-a25c-a78743fe47ab@g4g2000yqa.googlegroups.com>
	<ho7rjf$lki$1@news.eternal-september.org>
Message-ID: <73728874-ff0a-4360-a328-50fc19236bf6@d27g2000yqf.googlegroups.com>

Hi Alf,

After doing some more research, including the character-by-character
comparison you suggested (thank you!), I was able to get things
working the way I wanted using the following:

def getInstalledKernelVersion(mountPoint):
    linuxFsRoot = mountPoint + "/root"
    installedKernelVersionResult = subprocess.Popen(['/usr/sbin/
chroot',linuxFsRoot,'/bin/rpm','-q','kernel-xen'],
stdout=subprocess.PIPE).communicate()[0]
    return installedKernelVersionResult


Thanks very much for you help,

-Matt


On Mar 22, 9:33?am, "Alf P. Steinbach" <al... at start.no> wrote:
> * newton10471:
>
>
>
> > Hi,
>
> > I'm trying to use subprocess.Popen() to do a Linux chroot to a mount
> > point passed in as a parameter to the following function:
>
> > def getInstalledKernelVersion(mountPoint):
> > ? ? linuxFsRoot = mountPoint + "/root"
> > ? ? print "type of linuxFsRoot is %s" % type(linuxFsRoot)
> > ? ? installedKernelVersionResult =
> > subprocess.Popen(['chroot',linuxFsRoot,'rpm','-q','kernel-xen'])
> > ? ? return installedKernelVersionResult
>
> > and it dies with the following:
>
> > type of linuxFsRoot is <type 'str'>
> > chroot: cannot change root directory to /storage/mounts/
> > mnt_3786314034939740895.mnt/root: No such file or directory
>
> > When I explicitly set linuxFsRoot = "/storage/mounts/
> > mnt_3786314034939740895.mnt/root", it works fine.
>
> > I also tried this to concatenate the mountpoint + /root, and it failed
> > in the same way:
>
> > linuxFsRoot = ("%s/root") % mountPoint
>
> Use the os.path functions.
>
> > Anyone know what might be happening here?
>
> Since the computed and literal paths /look/ identical and same type, the only
> thing I can imagine is that there is some invisible character. Try comparing the
> computed and literal path character by character. Print the difference or if
> they're identical, that they are.
>
> Possibly you have GIGO problem.
>
> Cheers & hth.,
>
> - Alf



From dksreddy at gmail.com  Thu Mar 25 08:15:54 2010
From: dksreddy at gmail.com (Sandy)
Date: Thu, 25 Mar 2010 05:15:54 -0700 (PDT)
Subject: cxfreeze on ubuntu 9.10
References: <84719a38-3d00-4d46-aa11-f0dca7ace71c@q15g2000yqj.googlegroups.com>
Message-ID: <0a385e57-7564-47e1-ab4b-0c75de8ce0d2@r27g2000yqn.googlegroups.com>

I used cxFreeze without any problem on Ubuntu 9.10 32 bit version. I
tried it on a wxPython gui script and
it works fine though I did'n use any setup file.
Just try cxFreeze executable (should be in /usr/bin/) instead of setup
file.

$/usr/bin/cxFreeze my_script.py --target-dir=/what_ever_dir/

what_ever_dir will have the executable file and other libraries needed
to run the executable.

- dksr


On Mar 25, 12:33?am, Waspinator <patrickw... at gmail.com> wrote:
> Hi,
>
> I'm trying to compile a python script on Ubuntu 9.10. It uses the gtk
> toolkit. I tried to run GUI2EXE for a cxfreeze gui, but even after
> installing wxPython in synaptic it still complains about not having
> it.
>
> I also tried to use cxfreeze by itself but the file it produces does
> not run.
>
> I tried to follow the information athttp://cx-freeze.sourceforge.net/cx_Freeze.html
>
> I created a setup.py file that looks like this (from the page)
>
> from cx_Freeze import setup, Executable
>
> setup(
> ? ? ? ? name = "gtk_test",
> ? ? ? ? version = "0.1",
> ? ? ? ? description = "gtk_test",
> ? ? ? ? executables = [Executable("gtk_test.py")])
>
> and ran:
>
> python setup.py build
>
> When I try to run the executable I get the following error:
>
> ../build/exe.linux-i686-2.6/library.zip/gtk/_gtk.py:12:
> RuntimeWarning: tp_compare didn't return -1 or -2 for exception
> ImportError: could not import gio
> ImportError: could not import gio
> Traceback (most recent call last):
> ? File "/usr/lib/pymodules/python2.6/cx_Freeze/initscripts/
> Console.py", line 29, in <module>
> ? ? exec code in m.__dict__
> ? File "gtk_test.py", line 274, in <module>
> ? File "gtk_test.py", line 228, in main
> AttributeError: 'module' object has no attribute 'Window'
>
> I was thinking of using the 'copy-dependent-files' option but I'm not
> sure how.
>
> Any ideas?
>
> Thanks



From ethan at stoneleaf.us  Thu Mar 25 08:28:22 2010
From: ethan at stoneleaf.us (Ethan Furman)
Date: Thu, 25 Mar 2010 05:28:22 -0700
Subject: Advanced Python Programming Oxford Lectures [was: Re: *Advanced*
	Python book?]
In-Reply-To: <dc17e529-2688-4dbe-a7dc-54535ac940bc@g3g2000pre.googlegroups.com>
References: <mailman.7404.1232137641.3487.python-list@python.org>
	<dc17e529-2688-4dbe-a7dc-54535ac940bc@g3g2000pre.googlegroups.com>
Message-ID: <4BAB56E6.2070201@stoneleaf.us>

Michele Simionato wrote:
> On Jan 16, 9:27 pm, mk <mrk... at gmail.com> wrote:
> 
>>Hello everyone,
>>
>>I looked for it I swear, but just can't find it.
>>
>>Most Python books seem to focus on examples of how to call functions
>>from standard library. I don't need that, I have online Python
>>documentation for that.
>>
>>I mean really advanced mental gymnastics, like gory details of how
>>Python objects operate, how to exploit its dynamic capabilities, dos and
>>donts with particular Python objects, advanced tricks, everything from
>>chained decorators to metaprogramming. Dive Into Python comes closest to
>>this ideal from what I have found, but still not far enough.
>>
>>Anybody found such holy grail?
> 
> "Expert Python Programming" by Tarek Ziad? is quite good and I wrote
> a review for it:
> 
> http://www.artima.com/weblogs/viewpost.jsp?thread=240415
> 
> There is plenty of info about Advanced Python on the net, much more
> than in book form. Come to think of it, there are my Oxford lectures
> (the title was exactly "Advanced Python Programming") and I could
> republish it on my blog, since I cannot find them on the net anymore.
> 
>            Michele Simionato

Michele,

Was wondering if you'd had a chance to re-post your lectures -- just did 
a search for them and came up empty, and I would love to read them!

Many thanks in advance!

~Ethan~


From neilc at norwich.edu  Thu Mar 25 08:37:14 2010
From: neilc at norwich.edu (Neil Cerutti)
Date: 25 Mar 2010 12:37:14 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<pan.2010.03.24.21.07.24@REMOVE.THIS.cybersource.com.au>
	<2010032423502316807-tomfsessile@gmailcom>
	<pan.2010.03.25.07.34.50@REMOVE.THIS.cybersource.com.au>
Message-ID: <8113nqFsggU3@mid.individual.net>

On 2010-03-25, Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:
>> You might not want to be so glib.  The sum doc sure doesn't
>> sound like it should work on lists.
>> 
>>     Returns the sum of a sequence of numbers (NOT strings) plus the
>>     value of parameter 'start' (which defaults to 0).
>
> What part of that suggested to you that sum might not be polymorphic? 
> Sure, it says numbers (which should be changed, in my opinion), but it 
> doesn't specify what sort of numbers -- ints, floats, or custom types 
> that have an __add__ method.

WTF.

-- 
Neil Cerutti
"It's not fun to build walls. But it's even less fun to live
without walls in a world full of zombies." --Greedy Goblin


From stefan_ml at behnel.de  Thu Mar 25 08:44:35 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Thu, 25 Mar 2010 13:44:35 +0100
Subject: sum for sequences?
In-Reply-To: <8113nqFsggU3@mid.individual.net>
References: <hodb43$pt$1@reader1.panix.com>	<pan.2010.03.24.21.07.24@REMOVE.THIS.cybersource.com.au>	<2010032423502316807-tomfsessile@gmailcom>	<pan.2010.03.25.07.34.50@REMOVE.THIS.cybersource.com.au>
	<8113nqFsggU3@mid.individual.net>
Message-ID: <hoflri$dnp$1@dough.gmane.org>

Neil Cerutti, 25.03.2010 13:37:
> On 2010-03-25, Steven D'Aprano wrote:
>>> You might not want to be so glib.  The sum doc sure doesn't
>>> sound like it should work on lists.
>>>
>>>      Returns the sum of a sequence of numbers (NOT strings) plus the
>>>      value of parameter 'start' (which defaults to 0).
>>
>> What part of that suggested to you that sum might not be polymorphic?
>> Sure, it says numbers (which should be changed, in my opinion), but it
>> doesn't specify what sort of numbers -- ints, floats, or custom types
>> that have an __add__ method.
>
> WTF.

Warning: truth found!

Stefan



From python at hope.cz  Thu Mar 25 08:45:21 2010
From: python at hope.cz (Johny)
Date: Thu, 25 Mar 2010 05:45:21 -0700 (PDT)
Subject: Does a tiny Python distribution exist?
Message-ID: <29c82125-10ce-4302-9423-c8b92a7911f9@q23g2000yqd.googlegroups.com>

Does anyone know if there is a tiny Python distribution available
running in a Linux environment?


From alfps at start.no  Thu Mar 25 09:02:05 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Thu, 25 Mar 2010 14:02:05 +0100
Subject: sum for sequences?
In-Reply-To: <8113nqFsggU3@mid.individual.net>
References: <hodb43$pt$1@reader1.panix.com>
	<pan.2010.03.24.21.07.24@REMOVE.THIS.cybersource.com.au>
	<2010032423502316807-tomfsessile@gmailcom>
	<pan.2010.03.25.07.34.50@REMOVE.THIS.cybersource.com.au>
	<8113nqFsggU3@mid.individual.net>
Message-ID: <hofmom$vkk$1@news.eternal-september.org>

* Neil Cerutti:
> On 2010-03-25, Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:
>>> You might not want to be so glib.  The sum doc sure doesn't
>>> sound like it should work on lists.
>>>
>>>     Returns the sum of a sequence of numbers (NOT strings) plus the
>>>     value of parameter 'start' (which defaults to 0).
>> What part of that suggested to you that sum might not be polymorphic? 
>> Sure, it says numbers (which should be changed, in my opinion), but it 
>> doesn't specify what sort of numbers -- ints, floats, or custom types 
>> that have an __add__ method.
> 
> WTF.

I think Steven's argument is that it would be pointless for 'sum' to distinguish 
between user-defined numerical types and other types that happen to support '+'.

It could make such a distinction since there's a type hierarchy for numbers, but 
then that should IMHO be more clearly documented.

However, given that it isn't restricted to numbers, the restriction wrt. strings 
is a bit perplexing in the context of modern CPython. But for Python 
implementations that don't offer the '+=' optimization it might help to avoid 
gross inefficiencies, namely quadratic time string concatenation. E.g., here's a 
natural implementation of sum  --  with unoptimized '+=' yielding quadratic time 
for the string concatenation (with modern CPython it's linear time, though):

<example>
   >>> def sum_all( values, start = 0 ):
   ...     s = start
   ...     for v in values: s += v
   ...     return s
   ...
   >>> sum_all( (1, 2, 3, 4) )
   10
   >>> sum_all( ("a", "b", "c", "d"), "" )
   'abcd'
   >>> sum_all( ((1, 2), (3, 4), (5, 6)), () )
   (1, 2, 3, 4, 5, 6)
   >>> _
</example>

However, if that hypothesis about the rationale is correct, then 'sum' should 
also be restricted to not handle tuples or lists, so forth, but at least the 
CPython implementation does.

So perhaps the documentation needs to be more clear?


Cheers,

- Alf


From icanbob at gmail.com  Thu Mar 25 09:17:34 2010
From: icanbob at gmail.com (bobicanprogram)
Date: Thu, 25 Mar 2010 06:17:34 -0700 (PDT)
Subject: Advice needed on parallel processing in python
References: <0a050a71-8ff1-4393-aba9-9115eb38cbec@q21g2000yqm.googlegroups.com>
	<ffc29248-7f1f-4bb7-85c8-f118806fd7d4@e7g2000yqf.googlegroups.com>
Message-ID: <ac04323b-8a35-4c92-a0dc-846137e7869f@19g2000yqu.googlegroups.com>

On Mar 24, 1:13 pm, Jon Clements <jon... at googlemail.com> wrote:
> On 24 Mar, 15:27, Glazner <yoavglaz... at gmail.com> wrote:
>
>
>
> > Hi!
>
> > I need to replace an app that does number crunching over a local
> > network.
> > it have about 50 computers as slaves
> > each computer needs to run COM that will do the "job"
> > right now the system uses MFC threads and DCOM to distribute the load.
>
> > as i said, Now i'm trying to replace this system with python.
> > I already use win32all and read about Pareller Python and Pyro.
>
> > a requirement is that messages can be sent to the remote worker.
>
> > If anyone can share experience I'll love to hear
>
> > Many Thanks,
> > Yoav Glazner
>
> Would Celery suit?http://celeryproject.org/
>
> hth
>
> Jon.


If you can add just one Linux server onto that network you could use
SIMPL-Python to do what you want.

http://www.icanprogram.com/06py/lesson1/lesson1.html

ie. SIMPL messages going seamlessly from Python (Windows) to Python
(Windows) with the SIMPL sandbox being hosted on the Linux node.

Of course if you wanted to add Linux nodes as processing nodes.
Python (Windows) modules could seamlessly exchange messages with those
as well.  Same would be true if you wanted to distribute part of your
app into the cloud.  All your Python code would look virtually
identical in each of these cases.

As an example of an inexpensive Linux node the SIMPL toolkit has been
ported to the ~$100 Sheeva Plug computer (http://www.icanprogram.com/
simpl/plugsimplbin.self.html)  (http://www.plugcomputer.org).

bob


From icanbob at gmail.com  Thu Mar 25 09:22:14 2010
From: icanbob at gmail.com (bobicanprogram)
Date: Thu, 25 Mar 2010 06:22:14 -0700 (PDT)
Subject: Python is cool!!
References: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
Message-ID: <05932144-af1d-4369-8999-50ca5575ae20@z4g2000yqa.googlegroups.com>

On Mar 23, 11:55 am, Jose Manuel <jfernan... at gmail.com> wrote:
> I have been learning Python, and it is amazing .... I am using the
> tutorial that comes with the official distribution.
>
> At the end my goal is to develop applied mathematic in engineering
> applications to be published on the Web, specially on app. oriented to
> simulations and control systems, I was about to start learning Java
> but I found Python which seems easier to learn that Java.
>
> Would it be easy to integrate Python in Web pages with HTML? I have
> read many info on Internet saying it is, and I hope so ....
>
> Any opinion


You probably want to take a look at this tutorial as well:

http://www.icanprogram.com/06py/lesson1/lesson1.html

The SIMPL toolkit will give you added flexibility to choose the
language for some of your more computationally intensive simulations
and still present a unified Python interface to the whole thing.

bob


From michele.simionato at gmail.com  Thu Mar 25 09:24:04 2010
From: michele.simionato at gmail.com (Michele Simionato)
Date: Thu, 25 Mar 2010 06:24:04 -0700 (PDT)
Subject: Advanced Python Programming Oxford Lectures [was: Re: *Advanced* 
	Python book?]
References: mailman.1182.1269520510.23598.python-list@python.org
Message-ID: <54e41616-df9f-42dd-9c91-9e530650bd99@j21g2000yqh.googlegroups.com>

On Mar 25, 1:28?pm, Ethan Furman <et... at stoneleaf.us> wrote:
>
> Michele,
>
> Was wondering if you'd had a chance to re-post your lectures -- just did
> a search for them and came up empty, and I would love to read them!
>
> Many thanks in advance!

Oops, I forgot! I will try to make them available soon.


From bruno.42.desthuilliers at websiteburo.invalid  Thu Mar 25 10:02:18 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 25 Mar 2010 15:02:18 +0100
Subject: Advice Criticism on Python App
In-Reply-To: <pan.2010.03.25.05.10.05@REMOVE.THIS.cybersource.com.au>
References: <de18cb49-b0fd-4862-b9af-3743720e0db6@u19g2000prh.googlegroups.com>	<uholq5peen08i78f968juvhskpedhhnlr3@4ax.com>
	<pan.2010.03.25.05.10.05@REMOVE.THIS.cybersource.com.au>
Message-ID: <4bab6cd6$0$9118$426a74cc@news.free.fr>

Steven D'Aprano a ?crit :
> On Wed, 24 Mar 2010 21:14:23 -0700, Tim Roberts wrote:
> 
>> Jimbo <nilly16 at yahoo.com> wrote:
>>> class stock:
>>>    code             = ""
>>>    purchasePrice    = 0
>>>    purchaseQuantity = 0
>>>    price            = []  # list of recent prices 
>>>    recentBid        = []  # list of recent bids for stock
>>>    recentOffer      = []  # list of recent offers for stock
>>>    stockVol         = []  # list of stock quantity available on market
>> Using lists as class variables is a very good way to create very
>> surprising bugs.  Consider the following:
> [snip]
> 
> 
> Don't you think that the class attributes are *supposed* to be shared by 
> all instances? In that case the behaviour you show is not a bug at all.

Python's class attributes are indeed supposed to be shared - that's even 
the whole point of having class attributes.

But this feature has proven to be confusing for newcomers that more 
often than not have previous exposure to OOPLs where you do "declare" 
your class "schema" at the class level (where Python defines class 
attributes).

Now reread the OP's code, and you'll find out he's indeed yet another 
victim of this gotcha:

"""
     for row in cur.fetchall():
         newStock = stock()
         newStock.code             = row[0]
         newStock.purchasePrice    = row[1]
         newStock.purchaseQuantity = row[2]
         cur.execute(stockQuery,[newStock.code])
         for rw in cur.fetchall():
             newStock.price.append(rw[0])
             newStock.recentOffer.append(rw[1])
             newStock.recentBid.append(rw[2])
             newStock.stockVol.append(rw[3])
        stockList.append(newStock)
"""


From mehgcap at gmail.com  Thu Mar 25 10:38:36 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Thu, 25 Mar 2010 10:38:36 -0400
Subject: threads (specifically timers) and releasing resources
In-Reply-To: <4BAB3383.7080003@timgolden.me.uk>
References: <bc7f680c1003241931v4ec88d15ge5639d96834c1db5@mail.gmail.com>
	<4BAB3383.7080003@timgolden.me.uk>
Message-ID: <bc7f680c1003250738n47ab72a5xa4aad8175c4ff6ce@mail.gmail.com>

Thanks, this should work.

On 3/25/10, Tim Golden <mail at timgolden.me.uk> wrote:
> On 25/03/2010 02:31, Alex Hall wrote:
>> Okay, I have my program and it has three different modes (there will
>> be more than that). Each mode will have a timer attached to it. If the
>> mode remains active and the timer runs out, a function specific to
>> that mode is called. If that mode is switched away from, however, the
>> timer is canceled and a new timer is created for the mode to which the
>> user just switched.
>
> I assume you're using Python's threading.Timer objects as you'd discussed
> those before. If so, that's basically a threading.Thread in disguise.
> In which case, you're going to have to make sure it cleans up after itself,
> releasing whatever resources it holds.
>
> Python's reference-count semantics and cyclic gc will take care of
> things in the normal way once the timer-thread has completed. But
> you'll have to make sure it completes.
>
>> If the latter, is there a way to completely destroy a thread?
>
> No: in Python, a thread has to self-destruct. This is a relatively
> FAQ and there are quite a few recipes around. Here's an example of
> something which seems to be close to your current needs:
>
> http://code.activestate.com/recipes/464959-resettable-timer-class/
>
> TJG
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From bruno.42.desthuilliers at websiteburo.invalid  Thu Mar 25 11:01:51 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 25 Mar 2010 16:01:51 +0100
Subject: Python is cool!!
In-Reply-To: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
References: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
Message-ID: <4bab7acb$0$2873$426a74cc@news.free.fr>

Jose Manuel a ?crit :
> I have been learning Python, and it is amazing .... I am using the
> tutorial that comes with the official distribution.
> 
> At the end my goal is to develop applied mathematic in engineering
> applications to be published on the Web, specially on app. oriented to
> simulations and control systems, I was about to start learning Java
> but I found Python which seems easier to learn that Java.

Python is indeed quite lightweight when compared to Java. But it has 
it's share of non-obvious features, dark corners, gotchas, and plain 
warts too.

> Would it be easy to integrate Python in Web pages with HTML? I have
> read many info on Internet saying it is, and I hope so ....

If you think of some server-page PHP-like solution, you won't find much 
usable stuff. There are quite a few Python web development toolkits / 
frameworks, but Django is becoming the de facto standard. Arguably not 
the "best" framework (depending on your definition of "best"), but 
certainly one of the most pythonic and well documented around.


From fpm at u.washington.edu  Thu Mar 25 11:10:59 2010
From: fpm at u.washington.edu (cassiope)
Date: Thu, 25 Mar 2010 08:10:59 -0700 (PDT)
Subject: Does a tiny Python distribution exist?
References: <29c82125-10ce-4302-9423-c8b92a7911f9@q23g2000yqd.googlegroups.com>
Message-ID: <25d0272d-1a49-40e0-96ac-6c8d431b0c18@c20g2000prb.googlegroups.com>

On Mar 25, 5:45?am, Johny <pyt... at hope.cz> wrote:
> Does anyone know if there is a tiny Python distribution available
> running in a Linux environment?

Debian has a package: "python-minimal".

HTH...


From omrihsan at gmail.com  Thu Mar 25 11:23:46 2010
From: omrihsan at gmail.com (Omer Ihsan)
Date: Thu, 25 Mar 2010 08:23:46 -0700 (PDT)
Subject: nested threading
Message-ID: <4566e767-768f-4399-8a6b-5530ec90b03c@a37g2000prd.googlegroups.com>

is there anything as "nested threading"....that is, call a thread from
within a thread.
in this case how will thread locking take place.

for example initially there were two functions that were called using
threading.Thread. these wont get unlocked unless both of them are done
with whatever they need to do. if say function 2 calls another thread.
then what??

inquisitive....:-|


From mail at timgolden.me.uk  Thu Mar 25 11:25:46 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Thu, 25 Mar 2010 15:25:46 +0000
Subject: Does a tiny Python distribution exist?
In-Reply-To: <25d0272d-1a49-40e0-96ac-6c8d431b0c18@c20g2000prb.googlegroups.com>
References: <29c82125-10ce-4302-9423-c8b92a7911f9@q23g2000yqd.googlegroups.com>
	<25d0272d-1a49-40e0-96ac-6c8d431b0c18@c20g2000prb.googlegroups.com>
Message-ID: <4BAB807A.7040104@timgolden.me.uk>

On 25/03/2010 15:10, cassiope wrote:
> On Mar 25, 5:45 am, Johny<pyt... at hope.cz>  wrote:
>> Does anyone know if there is a tiny Python distribution available
>> running in a Linux environment?
>
> Debian has a package: "python-minimal".
>
> HTH...

tinypy?

http://www.tinypy.org/

TJG


From jason.heeris at gmail.com  Thu Mar 25 11:39:01 2010
From: jason.heeris at gmail.com (Jason)
Date: Thu, 25 Mar 2010 08:39:01 -0700 (PDT)
Subject: Represent object type as
Message-ID: <6a6a37e3-f04f-4b63-9134-7ca9fd137297@f14g2000pre.googlegroups.com>

Hi,

I want to send objects (new style) over DBUS. DBUS can only send
fairly primitive types[1] so I turn my objects into dicts and send
that. I'm reusing the __getstate__ function I wrote for pickling like
so:

    def __getstate__(self):
        attrs = self.__dict__.copy()
        return attrs

...which is perfectly adequate to dict-ify and reconstitute this
simple class. That works just fine over DBUS.

The trouble is, the object could actually be of some slightly
different types, so I'd like to include that information as well. I
tried something like:

    def __getstate__(self):
        attrs = self.__dict__.copy()
        attrs.update({'type': type(self)})
        return attrs

...but then realised that "type" is not primitive enough for DBUS to
pickle.

So, (a) can I get the type name from the type object, or (b) is there
a better way to do this?

(This pertains to Python 2.5.4.)

Cheers,
? Jason

[1] http://dbus.freedesktop.org/doc/dbus-python/doc/tutorial.html#data-types


From bruno.42.desthuilliers at websiteburo.invalid  Thu Mar 25 12:00:34 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 25 Mar 2010 17:00:34 +0100
Subject: Represent object type as
In-Reply-To: <6a6a37e3-f04f-4b63-9134-7ca9fd137297@f14g2000pre.googlegroups.com>
References: <6a6a37e3-f04f-4b63-9134-7ca9fd137297@f14g2000pre.googlegroups.com>
Message-ID: <4bab888e$0$26553$426a74cc@news.free.fr>

Jason a ?crit :
> Hi,
> 
> I want to send objects (new style) over DBUS. DBUS can only send
> fairly primitive types[1] so I turn my objects into dicts and send
> that. I'm reusing the __getstate__ function I wrote for pickling like
> so:
> 
>     def __getstate__(self):
>         attrs = self.__dict__.copy()
>         return attrs
> 
> ...which is perfectly adequate to dict-ify and reconstitute this
> simple class. That works just fine over DBUS.
> 
> The trouble is, the object could actually be of some slightly
> different types, so I'd like to include that information as well. I
> tried something like:
> 
>     def __getstate__(self):
>         attrs = self.__dict__.copy()
>         attrs.update({'type': type(self)})

           attrs['type'] = type(self)

Do the same thing with less work !-)

Also and while we're at it, using a __magicname__ convention here (ie : 
'__type__' instead of 'type') might avoid possible collisions.

>         return attrs
> 
> ...but then realised that "type" is not primitive enough for DBUS to
> pickle.
> 
> So, (a) can I get the type name from the type object,

     attrs['__typename__'] = type(self).__name__


Warning: won't be very useful if your code still uses old-style classes.

> or (b) is there
> a better way to do this?

Depends on what you do with this dict, DBUS etc. And of your definition 
of "better", of course.


HTH


From sccolbert at gmail.com  Thu Mar 25 12:23:47 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Thu, 25 Mar 2010 12:23:47 -0400
Subject: ANN: Pymazon 0.1.1 Released
Message-ID: <7f014ea61003250923k50d1fc60h108f83c01c15478b@mail.gmail.com>

I'm happy to announce the release of Pymazon 0.1.1!

This release brings a big enhancement in the form of PyGtk support in
addition to the PyQt4 and Command line interfaces already available.
A special thanks to Ray Meyers for his gtk commits!

Pymazon Changelog

0.1.1
-----
- Added support for command line options and configuration file
- Added support for save name templates
- Added a threaded downloader which runs a user-specified simultaneous
threads when in gui mode
- Added a PyGtk Gui (Submitted by Raymond Myers)
- Rewrote the QT Gui with Qt Designer and pyuic4 - this simplified and
cleaned up a bunch of stuff
- Added graphical progress bars to the Gui's
- Removed a check that asserted the downloaded file size was the same as
specified in the amz file
  as Amazon was misreporting file size and it was causing Pymazon to
erroneously fail
- Cleaned up code all over the place: logging, settings, etc...


Pymazon is available in the cheeseshop and google code.

Pymazon is a Python implemented downloader for the amazon mp3 store.

You can read more about Pymazon at http://code.google.com/p/pymazon/.

I always appreciate comments and bug reports.

Cheers!

Chris
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From tjreedy at udel.edu  Thu Mar 25 12:43:13 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 25 Mar 2010 12:43:13 -0400
Subject: from import and __init__.py
In-Reply-To: <20100325101632.GA4727@xs4all.nl>
References: <20100325101632.GA4727@xs4all.nl>
Message-ID: <hog3r2$8mr$1@dough.gmane.org>

On 3/25/2010 6:16 AM, egbert wrote:
> When I do 'from some_package import some_module'
> the __init__.py of some_package will be run.
> However, there will not be anything like a  package-module,
> and the effects of __init__.py seem all to be lost. Is that true ?

No. If you do

from sys import modules
print(modules.keys())

you will see both some_package and some_package.some_module among the 
entries. The first is the result of executing some_package/__init__.py. 
As usual, that code will *not* be re-exectured on subsequent imports 
involving some_package.


 > Or can I still do something useful with __init__.py ?
 > e

Some packages put something like 'from _default_stuff import *' in 
__init__.py with the intention that the package by used as

import package

perhaps [optionally] followed by

import package.specialized_stuff

Terry Jan Reedy





From sridharr at activestate.com  Thu Mar 25 12:59:30 2010
From: sridharr at activestate.com (Sridhar Ratnakumar)
Date: Thu, 25 Mar 2010 09:59:30 -0700
Subject: ANN: ActivePython 2.6.5.12 and 3.1.2.3 are now available
Message-ID: <5BD6EC71-9F23-4DF8-9DCE-9A03E6FFFAEC@activestate.com>

We are pleased to announce the availability of both ActivePython 2.6.5.12 and ActivePython 3.1.2.3. 

    http://www.activestate.com/activepython/

Here is what you should know about these two releases:

PyWin32: PyWin32 is now included in the 64-bit & Python3 builds! Since we recently updated our PyWin32 source tree, this release comes with several bug fixes.

PyPM: There is now an ?upgrade? feature in PyPM, our beloved Python Package Manager distributed with ActivePython free of charge. What this means is that if you type ?pypm upgrade? it will update all your installed Python Packages to the latest version to save you time and keep you up-to-date.

Switch between Python versions: Also new in this 2.6 release is a new tool called "pythonselect" that can be used to switch between multiple ActivePython versions. This is currently only supported on MacOSX although support for other platforms and, perhaps, other Python installations, is in the roadmap (patches are welcome too!).

Dive Into Python 3: ActivePython 3.1.2.3 now includes Mark Pilgrim?s Dive Into Python 3, the popular advanced tutorial for learning Python3. You can find it  in the documentation section.

Miscellaneous: We also updated the base Tcl/Tk version to 8.5.8; added OpenSSL and ctypes support in the 64-bit build; upgraded to openssl-0.9.8l; included Tcl/Tk development headers ? among several other bug fixes with IDLE and Tkinter installation. And of course, they use the latest Python version: 2.6.5 and 3.1.2.

See the release notes for full details:

    http://docs.activestate.com/activepython/2.6/relnotes.html#changes
    http://docs.activestate.com/activepython/2.6/relnotes.html#changes

And our blog post on this release:

    http://blogs.activestate.com/2010/03/activestate-releases-activepython-2-6-5-12-and-activepython-3-1-2-3/


What is ActivePython?
---------------------

ActivePython is ActiveState's binary distribution of Python. Builds for Windows, Mac OS X, Linux are made freely available. Builds for Solaris, HP-UX and AIX, and access to older versions are available with ActivePython Business Edition:

    http://www.activestate.com/business_edition/

ActivePython includes the Python core and the many core extensions: zlib and bzip2 for data compression, the Berkeley DB (bsddb) and SQLite (sqlite3) database libraries, OpenSSL bindings for HTTPS support, the Tix GUI widgets for Tkinter, ElementTree for XML
processing, ctypes (on supported platforms) for low-level library access, and others. The Windows distribution ships with PyWin32 -- a
suite of Windows tools developed by Mark Hammond, including bindings to the Win32 API and Windows COM. 

Beginning with the 2.6.3.7 release, ActivePython includes a binary package manager for Python (PyPM) that can be used to install packages much easily. For example:

    pypm install pylons

See this page for full details:

    http://docs.activestate.com/activepython/2.6/whatsincluded.html

As well, ActivePython ships with a wealth of documentation for both new and experienced Python programmers. In addition to the core Python docs, ActivePython includes the "What's New in Python" series, "Dive into Python", the Python FAQs & HOWTOs, and the Python Enhancement Proposals (PEPs).

An online version of the docs can be found here:

    http://docs.activestate.com/activepython/2.6/

We would welcome any and all feedback to:

    ActivePython-feedback at activestate.com

Please file bugs against ActivePython at:

    http://bugs.activestate.com/query.cgi?set_product=ActivePython


On what platforms does ActivePython run?
----------------------------------------

ActivePython includes installers for the following platforms:

- Windows/x86
- Windows/x64 (aka "AMD64")
- Mac OS X
- Linux/x86
- Linux/x86_64 (aka "AMD64")
- Solaris/SPARC (Business Edition only)
- Solaris/x86 (Business Edition only)
- HP-UX/PA-RISC (Business Edition only)
- AIX/PowerPC (Business Edition only)
- AIX/PowerPC 64-bit (Business Edition only)

Custom builds are available in Enterprise Edition:

    http://www.activestate.com/activepython/enterprise/


Thanks, and enjoy!

The Python Team

--
Sridhar Ratnakumar
sridharr at activestate.com

From andreas.loescher at s2005.tu-chemnitz.de  Thu Mar 25 13:41:23 2010
From: andreas.loescher at s2005.tu-chemnitz.de (Andreas =?ISO-8859-1?Q?L=F6scher?=)
Date: Thu, 25 Mar 2010 18:41:23 +0100
Subject: Castrated traceback in sys.exc_info()
In-Reply-To: <mailman.1070.1269283632.23598.python-list@python.org>
Message-ID: <1269538883.9315.6.camel@laptop>


> As you see, the traceback only starts from function c, which handles the 
> exception.
> It doesn't show main(), a() and b(), which might however be (and are, in 
> my case) critical to diagnose the severity of the problem (since many 
> different paths would lead to calling c()).

This results in the way the tb is created.

If an exception occours, and there is no one who handles it in the
current function, a traceback object is created. Because the the calling
function could have a try-except clause, the function returns with NULL
and an set exception. Now if there is no one to handle the exception, a
traceback object is created and linked with the existing one.

In your case does the traceback start from the function c, because no
exception occoured in main() etc. You catched it. If you want to
determine the calling path, you can take a look at the encapsuled frame
in the tb. 

Best




From anfedorov at gmail.com  Thu Mar 25 13:41:57 2010
From: anfedorov at gmail.com (Andrey Fedorov)
Date: Thu, 25 Mar 2010 13:41:57 -0400
Subject: Repetition of work in Jython
Message-ID: <7659cab31003251041if13b73fmf17e759ea52b1015@mail.gmail.com>

Hi all,

So from what I understand, Jython translates Python code into JVM byte code.
Does anyone know why this was chosen instead of translating Python bytecode
to JVM bytecode directly? It seems that it would be a lot easier to get
Jython up-to-speed if there could be some "shared components" between them
and CPython, no?

- Andrey
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From steve at holdenweb.com  Thu Mar 25 14:10:00 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 25 Mar 2010 14:10:00 -0400
Subject: Repetition of work in Jython
In-Reply-To: <7659cab31003251041if13b73fmf17e759ea52b1015@mail.gmail.com>
References: <7659cab31003251041if13b73fmf17e759ea52b1015@mail.gmail.com>
Message-ID: <4BABA6F8.8070609@holdenweb.com>

Andrey Fedorov wrote:
> Hi all,
> 
> So from what I understand, Jython translates Python code into JVM byte
> code. Does anyone know why this was chosen instead of translating Python
> bytecode to JVM bytecode directly? It seems that it would be a lot
> easier to get Jython up-to-speed if there could be some "shared
> components" between them and CPython, no?
> 
I don't *know* why Jim Hugunin chose not to take that approach, but I
can easily imagine it would be because a mapping of the Python byte code
to the Java byte code would be much less efficient.

There are various approaches that one could take. The least efficient
would be to write a Python virtual machine in Java, thereby putting two
levels of interpretation into the execution paths.

I doubt it would be possible to get maximal JVM efficiency from code
cast into Python byte codes just because of the disparity between the
two VMs.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/


From steve at holdenweb.com  Thu Mar 25 14:10:00 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 25 Mar 2010 14:10:00 -0400
Subject: Repetition of work in Jython
In-Reply-To: <7659cab31003251041if13b73fmf17e759ea52b1015@mail.gmail.com>
References: <7659cab31003251041if13b73fmf17e759ea52b1015@mail.gmail.com>
Message-ID: <4BABA6F8.8070609@holdenweb.com>

Andrey Fedorov wrote:
> Hi all,
> 
> So from what I understand, Jython translates Python code into JVM byte
> code. Does anyone know why this was chosen instead of translating Python
> bytecode to JVM bytecode directly? It seems that it would be a lot
> easier to get Jython up-to-speed if there could be some "shared
> components" between them and CPython, no?
> 
I don't *know* why Jim Hugunin chose not to take that approach, but I
can easily imagine it would be because a mapping of the Python byte code
to the Java byte code would be much less efficient.

There are various approaches that one could take. The least efficient
would be to write a Python virtual machine in Java, thereby putting two
levels of interpretation into the execution paths.

I doubt it would be possible to get maximal JVM efficiency from code
cast into Python byte codes just because of the disparity between the
two VMs.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From sridharr at activestate.com  Thu Mar 25 14:47:27 2010
From: sridharr at activestate.com (Sridhar Ratnakumar)
Date: Thu, 25 Mar 2010 11:47:27 -0700
Subject: Possible? Python 2.6.x and PythonWin on 64-bit Windows 7
In-Reply-To: <AC49051E-3596-41CC-B973-A749AAB57F59@activestate.com>
References: <a46f9377-a06e-4af1-a23e-d53607ca62dc@q16g2000yqq.googlegroups.com>
	<5b6da8b6-f814-4779-b7cb-b02762e16f2c@a5g2000yqi.googlegroups.com>
	<5cb36cc2-fe75-4542-af70-b33400fd4dea@f8g2000yqn.googlegroups.com>
	<AC49051E-3596-41CC-B973-A749AAB57F59@activestate.com>
Message-ID: <B57F7916-1EF2-4B1A-8757-8CC446910E7C@activestate.com>


On 2010-02-09, at 2:49 PM, Sridhar Ratnakumar wrote:

> 
> On 2010-02-07, at 5:02 PM, escalation746 wrote:
> 
>> Andrej Mitrovic wrote:
>> 
>>> Perhaps you've accidentally downloaded the wrong version of PythonWin?
>> 
>> Erk, yes, my bad.
>> 
>> Thanks for the quick help! Though I still wonder why the ActiveState
>> build does not include this.
> 
> I just added support for PyWin32 in ActivePython 2.6 64-bit.
> 
>  http://twitter.com/sridhr/status/8874549314
> 
> I should be part of next release (2.6.4.11).

PyWin32, and thus PythonWin, is now available in all of the recent ActivePython releases: 2.5.5.7, 2.6.5.12 and 3.1.2.3. 

See also http://blogs.activestate.com/2010/03/activestate-releases-activepython-2-6-5-12-and-activepython-3-1-2-3/

-srid

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From irmen-NOSPAM- at xs4all.nl  Thu Mar 25 14:55:45 2010
From: irmen-NOSPAM- at xs4all.nl (Irmen de Jong)
Date: Thu, 25 Mar 2010 19:55:45 +0100
Subject: Is there any library for indexing binary data?
In-Reply-To: <mailman.1177.1269510930.23598.python-list@python.org>
References: <mailman.1168.1269487743.23598.python-list@python.org>	<4bab182a$0$22933$e4fe514c@news.xs4all.nl>
	<mailman.1177.1269510930.23598.python-list@python.org>
Message-ID: <4babb132$0$22945$e4fe514c@news.xs4all.nl>

On 25-3-2010 10:55, ?? wrote:
> Thank you irmen. I will take a look at pytable.
> FYI, let me explain the case clearly.
> 
> Originally, my big data table is simply array of Item:
> struct Item
> {
>      long id;    // used as key
>      BYTE payload[LEN];   // corresponding value with fixed length
> };
> 
> All items are stored in one file by using "stdio.h" function:
>      fwrite(itemarray, sizeof(Item), num_of_items, fp);
> 
> Note that "id" is randomly unique without any order. To speed up
> searching  I regrouped / sorted them into two-level hash tables (in
> the form of files).  I want to employ certain library to help me index
> this table.
> 
> Since the table contains about 10^9 items and LEN is about 2KB, it is
> impossible to hold all data in memory. Furthermore, some new item may
> be inserted into the array. Therefore incremental indexing feature is
> needed.

I see, I thought the payload data was small as well. What about this idea:
Build a hash table where the keys are the id from your Item structs and
the value is the file seek offset of the Item 'record' in your original
datafile. (although that might generate values of type long, which take
more memory than int, so maybe we should use file_offset/sizeof(Item).
This way you can just keep your original data file (you only have to
scan it to build the hash table) and you will avoid a lengthy conversion
process.

If this hashtable still doesn't fit in memory use a sparse array
implementation of some sort that is more efficient at storing simple
integers, or just put it into a database solution mentioned in earlier
responses.

Another thing: I think that your requirement of 1e7 lookups per second
is a bit steep for any solution where the dataset is not in core memory
at once though.

Irmen.


From st.chris at gmail.com  Thu Mar 25 15:51:48 2010
From: st.chris at gmail.com (=?UTF-8?Q?Christian_=C5=9Etef=C4=83nescu?=)
Date: Thu, 25 Mar 2010 20:51:48 +0100
Subject: Improved timedelta attributes/methods
Message-ID: <ded3be3b1003251251o69627c2ct6ed74020bad22c65@mail.gmail.com>

Hello dear Python-wielding developers!

I generally like date/time handling in Python very much, especially how date
operations result in Timedelta
objects<http://docs.python.org/library/datetime.html#timedelta-objects>.
But I find it somewhat impractical, that you can only get days, seconds and
microseconds out of a time delta. I think it would be much more comfortable
to have fields for minutes, hours, maybe also years, months. Is there a
specific reasoning why this is not available?

I would gladly do my best to implement such a solution, if it would make
sense to the devs.

Regards,
Chris
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From peter at psantoro.net  Thu Mar 25 16:07:42 2010
From: peter at psantoro.net (Peter)
Date: 25 Mar 2010 20:07:42 GMT
Subject: RELEASED Python 2.6.5
References: <mailman.990.1269039418.23598.python-list@python.org>
	<hoajos028di@drn.newsguy.com> <hoe3a9$vj3$1@online.de>
Message-ID: <hogfqe03fg@news1.newsguy.com>

On Wed, 24 Mar 2010 23:22:01 +0100, Martin v. Loewis wrote:

>> Is anyone else having trouble with the 2.6.5 Windows x86 installer?
> 
> Not me. Run
> 
> msiexec /i py...msi /l*v py.log
> 
> and inspect py.log for errors (post it to bugs.python.org if you can't
> determine the cause of the problems).


Martin,

Thanks for the tip about the msiexec command line usage.  If I run the 
installer without selecting the Advanced compiling option, it works fine.

The relevent part of the log when it fails using the Advanced compiling 
option is as follows:

--------------------

MSI (s) (4C:B4) [14:41:27:205]: Doing action: CompilePyc
Action 14:41:27: CompilePyc. 
Action start 14:41:27: CompilePyc.
MSI (s) (4C:B4) [14:45:45:528]: Note: 1: 1722 2: CompilePyc 3: C:\bin
\Python26\python.exe 4: -Wi "C:\bin\Python26\Lib\compileall.py" -f -x 
bad_coding|badsyntax|site-packages|py3_ "C:\bin\Python26\Lib" 
MSI (s) (4C:B4) [14:45:45:528]: Note: 1: 2262 2: Error 3: -2147287038 
Error 1722. There is a problem with this Windows Installer package. A 
program run as part of the setup did not finish as expected. Contact your 
support personnel or package vendor.  Action CompilePyc, location: C:\bin
\Python26\python.exe, command: -Wi "C:\bin\Python26\Lib\compileall.py" -f 
-x bad_coding|badsyntax|site-packages|py3_ "C:\bin\Python26\Lib" 
MSI (s) (4C:B4) [14:47:41:133]: Note: 1: 2262 2: Error 3: -2147287038 
MSI (s) (4C:B4) [14:47:41:133]: Product: Python 2.6.5 -- Error 1722. 
There is a problem with this Windows Installer package. A program run as 
part of the setup did not finish as expected. Contact your support 
personnel or package vendor.  Action CompilePyc, location: C:\bin\Python26
\python.exe, command: -Wi "C:\bin\Python26\Lib\compileall.py" -f -x 
bad_coding|badsyntax|site-packages|py3_ "C:\bin\Python26\Lib" 

Action ended 14:47:41: CompilePyc. Return value 3.
Action ended 14:47:41: INSTALL. Return value 3.

--------------------

I believe the cause of the installation failure message is with the 
syntax of the following command:

C:\bin\Python26\python.exe -Wi "C:\bin\Python26\Lib\compileall.py" -f -x 
bad_coding|badsyntax|site-packages|py3_ "C:\bin\Python26\Lib"

If you run this command in the Windows XP shell, it yields an error.  If 
you wrap the -x option's args in double quotes, it runs ok (except for a 
syntax error when compiling one of the python source files - I don't 
remember which one):

C:\bin\Python26\python.exe -Wi "C:\bin\Python26\Lib\compileall.py" -f -x 
"bad_coding|badsyntax|site-packages|py3_" "C:\bin\Python26\Lib"

So it appears that the Windows XP shell is interpreting the "|" 
characters within the -x option's args as pipe characters and trys to 
pipe the "multiple commands" together.  The simple work around is to not 
use the Advanced compiling option.

Peter


From steve at REMOVE-THIS-cybersource.com.au  Thu Mar 25 17:11:50 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 25 Mar 2010 21:11:50 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<pan.2010.03.24.21.07.24@REMOVE.THIS.cybersource.com.au>
	<2010032423502316807-tomfsessile@gmailcom>
	<pan.2010.03.25.07.34.50@REMOVE.THIS.cybersource.com.au>
	<8113nqFsggU3@mid.individual.net>
	<hofmom$vkk$1@news.eternal-september.org>
Message-ID: <4babd196$0$8766$c3e8da3@news.astraweb.com>

On Thu, 25 Mar 2010 14:02:05 +0100, Alf P. Steinbach wrote:

> * Neil Cerutti:
>> On 2010-03-25, Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au>
>> wrote:
>>>> You might not want to be so glib.  The sum doc sure doesn't sound
>>>> like it should work on lists.
>>>>
>>>>     Returns the sum of a sequence of numbers (NOT strings) plus the
>>>>     value of parameter 'start' (which defaults to 0).
>>> What part of that suggested to you that sum might not be polymorphic?
>>> Sure, it says numbers (which should be changed, in my opinion), but it
>>> doesn't specify what sort of numbers -- ints, floats, or custom types
>>> that have an __add__ method.
>> 
>> WTF.
> 
> I think Steven's argument is that it would be pointless for 'sum' to
> distinguish between user-defined numerical types and other types that
> happen to support '+'.

Before Python2.6, which introduced a numeric tower, Python *couldn't* 
reliably distinguish between numeric types and other types that 
overloaded +. Since Python discourages type-checking in favour of duck-
typing and try...except, this is seen as a good thing.

My argument is that sum isn't hard-coded to only work on the built-ins 
ints or floats, but it supports any object that you can use the + 
operator on. The *sole* exceptions are str and unicode (not even 
UserString), and even there it is very simple to overcome the restriction:

>>> sum(['a', 'b'], '')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: sum() can't sum strings [use ''.join(seq) instead]
>>> class S:
...     def __add__(self, other):
...             return other
...
>>> sum(['a', 'b'], S())
'ab'


[...]
> However, given that it isn't restricted to numbers, the restriction wrt.
> strings is a bit perplexing in the context of modern CPython. But for
> Python implementations that don't offer the '+=' optimization it might
> help to avoid gross inefficiencies, namely quadratic time string
> concatenation.

I agree -- the Python philosophy is to allow the user to shoot themselves 
in the foot if they wish to. You're responsible for the Big Oh behaviour 
of your code, not the compiler.


[...]
> However, if that hypothesis about the rationale is correct, then 'sum'
> should also be restricted to not handle tuples or lists, so forth, but
> at least the CPython implementation does.

The reasoning is that naive users are far, far more likely to try summing 
a large list of strings than to try summing a large list of lists, and 
therefore in practical terms the consequences of allowing sum on lists is 
slight enough and rare enough to not be worth the check.

I suspect that this is just an after the fact rationalisation, and that 
the real reason is that those responsible for the hand-holding in sum 
merely forgot, or didn't know, that repeated addition of lists and tuples 
is also O(N**2). But I've never cared enough to dig through the archives 
to find out.



-- 
Steven


From winstonw at stratolab.com  Thu Mar 25 17:16:12 2010
From: winstonw at stratolab.com (Winston)
Date: Thu, 25 Mar 2010 14:16:12 -0700 (PDT)
Subject: Revisiting Generators and Subgenerators
Message-ID: <a00c64fb-1eed-4bc8-943d-50e9d1c762ff@n39g2000prj.googlegroups.com>

I have been reading PEP 380 because I am writing a video game/
simulation in Jython and I need cooperative multitasking. PEP 380 hits
on my problem, but does not quite solve it for me. I have the
following proposal as an alternative to PEP380. I don't know if this
is the right way for me to introduce my idea, but below is my writeup.
Any thoughts?

------------------------
Proposal for a new Generator Syntax in Python 3K--
A Baton object for generators to allow subfunction to yield, and to
make
them symetric.

Abstract
--------
    Generators can be used to make coroutines. But they require the
programmer
    to take special care in how he writes his generator. In
particular,
    only the generator function may yield a value. We propose a
modification
    to generators in Python 3 where a "Baton" object is given to both
    sides of a generator. Both sides use the baton object to pass
execution
    to the other side, and also to pass values to the other side.

    The advantages of a baton object over the current scheme are: (1)
    the generator function can pass the baton to a subfunction,
solving the
    needs of PEP 380, (2) after creation both sides of the generator
function
    are symetric--they both can call yield(), send(), next(). They do
the
    same thing. This means programming with generators is the same as
    programming with normal functions. No special contortions are
needed
    to pass values back up to a yield command at the top.

Motivation
----------
    Generators make certain programming tasks easier, such as (a) an
iterator
    which is of infinite length, (b) using a "trampoline function"
they can
    emulate coroutines and cooperative multitasking, (c) they can be
used
    to make both sides of a producer-consumer pattern easy to write--
both
    sides can appear to be the caller.

    On the down side, generators as they currently are implemented in
Python 3.1
    require the programmer to take special care in how he writes his
    generator. In particular, only the generator function may yield a
    value--subfunctions called by the generator function may not yield
a value.

    Here are  two use-cases in which generators are commonly used, but
where the
    current limitation causes less readable code:

    1) a long generator function which the programmer wants to split
into several
        functions. The subfunctions should be able to yield a result.
Currently
        the subfunctions have to pass values up to the main generator
and have
        it yield the results back. Similarly subfunctions cannot
receive values
        that the caller sends with generator.send()

    2) generators are great for cooperative multitasking. A common use-
case is
        agent simulators where many small "tasklets" need to run and
then pass
        execution over to other tasklets. Video games are a common
scenario,
        as is SimPy. Without cooperative multitasking, each tasklet
must be
        contorted to run in a small piece and then return. Generators
help this,
        but a more complicated algorithm which is best decomposed into
several
        functions must be contorted because the subfuctions cannot
yield or
        recive data from the generator.send().

    Here is also a nice description of how coroutines make programs
    easier to read and write:
        http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html

Proposal
--------
    If there is a way to make a sub-function of a generator yield and
receive
    data from generator.send(), then the two problems above are
solved.

    For example, this declares a generator. The first parameter of the
generator
    is the "context" which represents the other side of the execution
frame.

    a Baton object represents a passing of the execution from one line
    of code to another. A program creates a Baton like so:

        generator f( baton ):
            # compute something
            baton.yield( result )
            # compute something
            baton.yield( result )

        baton = f()
        while True:
            print( baton.yield() )


    A generator function, denoted with they keyword "generator"
instead of "def"
    will return a "baton". Generators have the following methods:
        __call__( args... ) --
            This creates a Baton object which is passed back to the
caller,
            i.e. the code that executed the Baton() command. Once the
baton
            starts working, the two sides are symetric. So we will
call the
            first frame, frame A and the code inside 'function' frame
B.
            Frame is is returned a baton object. As soon as frame A
            calls baton.yield(), frame B begins, i.e. 'function'
starts
            to run. function is passed the baton as its first
argument,
            and any additional arguments are also passed in. When
frame B
            yields, any value that it yields will be returned to frame
A
            as the result of it's yield().
    Batons have the following methods:
        yield( arg=None ) -- This method will save the current
execution state,
            restore the other execution state, and start running the
            other function from where it last left off, or from the
beginning
            if this is the first time.
            If the optional 'arg' is given, then the other side will
be "returned"
            this value from it's last yield(). Note that like
generators, the first
            call to yield may not pass an argument.
        next() -- This method is the same as yield(None). next()
            allows the baton to be an iterator.
        __iter__() -- A baton is an iterator so this just returns the
baton
            back. But it is needed to allow use of batons in "for"
statements.
        start() -- This starts the frame B function running. It may
only be called on
            a new baton. It starts the baton running in frame B, and
            returns the Baton object to the caller in frame A. Any
value
            from the first yield is lost.

                baton = Baton( f ).start()
            It is equivalent to:
                baton = Baton( f )  # Create the baton
                baton.yield()       # Begin executing in frame B



Examples
--------

    Simple Generator:
        generator doubler( baton, sequence ):
            for a in sequence:
                print( a )
                baton.yield( a+a )

        baton = doubler( [3,8,2] )
        for j in baton: # For statement calls baton.__iter__, and then
baton.next()
            print j

    Complicated Generator broken into parts:

        generator Complicated( baton, sequence ):
            '''A generator function, but there are no yield statements
                in this function--they are in subfunctions.'''
            a = sequence.next()
            if is_special(a):
                parse_special( baton, a, sequence)
            else:
                parse_regular( baton, a, sequence )

        def parse_special( baton, first, rest ):
            # process first
            baton.yield()
            b = rest.next()
            parse_special( baton, b, rest )

        def parse_regular( baton, first, rest ):
            # more stuff
            baton.yield()

        baton = Complicated( iter('some data here') )
        baton.yield()


    Cooperative Multitasker:

        class Creature( object ):
            def __init__(self, world):
                self.world = world

            generator start( self, baton ):
                '''Designated entry point for tasklets'''
                # Baton saved for later. Used in other methods like
escape()
                self.baton = baton
                self.run()

            def run(self):
                pass # override me in your subclass

            def escape(self):
                # set direction and velocity away from baton creatures
                self.baton.yield()

            def chase(self):
                while True:
                    # set direction and velocity TOWARDS nearest
creature
                    self.baton.yield()
                    # if near enough, try to pounce
                    self.baton.yield()


        class Vegetarian( Tasklet ):
            def run(self):
                if self.world.is_creature_visible():
                    self.escape()
                else:
                    # do nothing
                    self.baton.yield()

        class Carnivore( Tasklet ):
            def run(self):
                if self.world.is_creature_visible():
                    self.chase()
                else:
                    # do nothing
                    self.baton.yield()

        w = SimulationWorld()
        v = Vegetarian( w ).start()
        c = Carnivore( w ).start()
        while True:
            v.yield()
            c.yield()


Benefits
--------

    This new syntax for a generator provides all the benefits of the
old
    generator, including use like a coroutine. Additionally, it makes
    both sides of the generator almost symetric, i.e. they both
"yield"
    or "send" to the other. And since the baton objects are passed
    around, subfunctions can yield back to the other execution frame.
    This fixes problems such as PEP 380.

    My ideas for syntax above are not fixed, the important concept
here is
    that the two sides of the generator functions will have a "baton"
to
    represent the other side. The baton can be passed to sub-
functions, and
    values can be sent, via the baton, to the other side.

    This new syntax for a generator will break all existing programs.
But
    we happen to be at the start of Python 3K where new paradaigms are
    being examined.

Alternative Syntax
------------------

    With old style generators, g.next() and g.send( 1 ) are
conceptually
    the same as "yield" and "yield 1" inside the generator. They both
pass
    execution to the other side, and the second form passes a value.
Yet they
    currently have different syntax. Once we have a baton object, we
can get rid of
    one of these forms. g.next() is needed to support iterators. How
about we keep
    baton.next() and baton.send( 1 ). We get rid of yield completely.

    Perhaps instead of a "generator" keyword to denote the generator
    function, a "fork" keyword should be used to begin the second
    execution frame. For example:

        def f( baton ):
            # compute something
            baton.send( result )
            # compute something
            baton.send( result )

        baton = fork f()
        while True:
            print( baton.next() )

    or maybe the "yield" keyword can be used here:

        def f( baton ):
            # compute something
            baton.send( result )
            # compute something
            baton.send( result )

        baton = yield f
        while True:
            print( baton.next() )


From winstonw at stratolab.com  Thu Mar 25 17:39:51 2010
From: winstonw at stratolab.com (Winston)
Date: Thu, 25 Mar 2010 14:39:51 -0700 (PDT)
Subject: Revisiting Generators and Subgenerators
Message-ID: <bc11ef60-2d6e-46d7-94b4-ed2096834b33@f12g2000prn.googlegroups.com>

Here's my proposal again, but hopefully with better formatting so you
can read it easier.


-Winston
-----------------

Proposal for a new Generator Syntax in Python 3K--
A Baton object for generators to allow subfunction to yield, and to
make
them symetric.

Abstract
--------
    Generators can be used to make coroutines. But they require
    the programmer to take special care in how he writes his
    generator. In particular, only the generator function may
    yield a value. We propose a modification to generators in
    Python 3 where a "Baton" object is given to both sides of a
    generator. Both sides use the baton object to pass execution
    to the other side, and also to pass values to the other side.

    The advantages of a baton object over the current scheme are:
    (1) the generator function can pass the baton to a
    subfunction, solving the needs of PEP 380, (2) after creation
    both sides of the generator function are symetric--they both
    can call yield(), send(), next(). They do the same thing.
    This means programming with generators is the same as
    programming with normal functions. No special contortions are
    needed to pass values back up to a yield command at the top.

Motivation
----------
    Generators make certain programming tasks easier, such as (a)
    an iterator which is of infinite length, (b) using a
    "trampoline function" they can emulate coroutines and
    cooperative multitasking, (c) they can be used to make both
    sides of a producer-consumer pattern easy to write--both
    sides can appear to be the caller.

    On the down side, generators as they currently are
    implemented in Python 3.1 require the programmer to take
    special care in how he writes his generator. In particular,
    only the generator function may yield a value--subfunctions
    called by the generator function may not yield a value.

    Here are  two use-cases in which generators are commonly
    used, but where the current limitation causes less readable
    code:

    1) a long generator function which the programmer wants to
    split into several functions. The subfunctions should be able
    to yield a result. Currently the subfunctions have to pass
    values up to the main generator and have it yield the results
    back. Similarly subfunctions cannot receive values that the
    caller sends with generator.send()

    2) generators are great for cooperative multitasking. A
    common use-case is agent simulators where many small
    "tasklets" need to run and then pass execution over to other
    tasklets. Video games are a common scenario, as is SimPy.
    Without cooperative multitasking, each tasklet must be
    contorted to run in a small piece and then return. Generators
    help this, but a more complicated algorithm which is best
    decomposed into several functions must be contorted because
    the subfuctions cannot yield or recive data from the
    generator.send().

    Here is also a nice description of how coroutines make
    programs easier to read and write:
        http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html

Proposal
--------
    If there is a way to make a sub-function of a generator yield
    and receive data from generator.send(), then the two problems
    above are solved.

    For example, this declares a generator. The first parameter
    of the generator is the "context" which represents the other
    side of the execution frame.

    a Baton object represents a passing of the execution from one
    line of code to another. A program creates a Baton like so:

        generator f( baton ):
            # compute something
            baton.yield( result )
            # compute something
            baton.yield( result )

        baton = f()
        while True:
            print( baton.yield() )


    A generator function, denoted with they keyword "generator"
    instead of "def" will return a "baton". Generators have the
    following methods:
        __call__( args... ) --
            This creates a Baton object which is passed back to
            the caller, i.e. the code that executed the Baton()
            command. Once the baton starts working, the two sides
            are symetric. So we will call the first frame, frame
            A and the code inside 'function' frame B. Frame is is
            returned a baton object. As soon as frame A calls
            baton.yield(), frame B begins, i.e. 'function' starts
            to run. function is passed the baton as its first
            argument, and any additional arguments are also
            passed in. When frame B yields, any value that it
            yields will be returned to frame A as the result of
            it's yield().

    Batons have the following methods:
        yield( arg=None ) -- This method will save the current
            execution state, restore the other execution state,
            and start running the other function from where it
            last left off, or from the beginning if this is the
            first time. If the optional 'arg' is given, then the
            other side will be "returned" this value from it's
            last yield(). Note that like generators, the first
            call to yield may not pass an argument.
        next() -- This method is the same as yield(None). next()
            allows the baton to be an iterator.
        __iter__() -- A baton is an iterator so this just returns
            the baton back. But it is needed to allow use of
            batons in "for" statements.
        start() -- This starts the frame B function running. It
            may only be called on a new baton. It starts the
            baton running in frame B, and returns the Baton
            object to the caller in frame A. Any value from the
            first yield is lost.

                baton = Baton( f ).start()
            It is equivalent to:
                baton = Baton( f )  # Create the baton
                baton.yield()       # Begin executing in frame B



Examples
--------

    Simple Generator:
        generator doubler( baton, sequence ):
            for a in sequence:
                print( a )
                baton.yield( a+a )

        baton = doubler( [3,8,2] )
        # For statement calls baton.__iter__, and then baton.next()
        for j in baton:
            print j

    Complicated Generator broken into parts:

        generator Complicated( baton, sequence ):
            '''A generator function, but there are no yield
            statements in this function--they are in
            subfunctions.'''
            a = sequence.next()
            if is_special(a):
                parse_special( baton, a, sequence)
            else:
                parse_regular( baton, a, sequence )

        def parse_special( baton, first, rest ):
            # process first
            baton.yield()
            b = rest.next()
            parse_special( baton, b, rest )

        def parse_regular( baton, first, rest ):
            # more stuff
            baton.yield()

        baton = Complicated( iter('some data here') )
        baton.yield()


    Cooperative Multitasker:

        class Creature( object ):
            def __init__(self, world):
                self.world = world

            generator start( self, baton ):
                '''Designated entry point for tasklets'''
                # Baton saved for later. Used in other
                # methods like escape()
                self.baton = baton
                self.run()

            def run(self):
                pass # override me in your subclass

            def escape(self):
                # set direction and velocity away
                # from baton creatures
                self.baton.yield()

            def chase(self):
                while True:
                    # set direction and velocity TOWARDS
                    # nearest creature
                    self.baton.yield()
                    # if near enough, try to pounce
                    self.baton.yield()


        class Vegetarian( Tasklet ):
            def run(self):
                if self.world.is_creature_visible():
                    self.escape()
                else:
                    # do nothing
                    self.baton.yield()

        class Carnivore( Tasklet ):
            def run(self):
                if self.world.is_creature_visible():
                    self.chase()
                else:
                    # do nothing
                    self.baton.yield()

        w = SimulationWorld()
        v = Vegetarian( w ).start()
        c = Carnivore( w ).start()
        while True:
            v.yield()
            c.yield()


Benefits
--------

    This new syntax for a generator provides all the benefits of
    the old generator, including use like a coroutine.
    Additionally, it makes both sides of the generator almost
    symetric, i.e. they both "yield" or "send" to the other. And
    since the baton objects are passed around, subfunctions can
    yield back to the other execution frame. This fixes problems
    such as PEP 380.

    My ideas for syntax above are not fixed, the important
    concept here is that the two sides of the generator functions
    will have a "baton" to represent the other side. The baton
    can be passed to sub-functions, and values can be sent, via
    the baton, to the other side.

    This new syntax for a generator will break all existing
    programs. But we happen to be at the start of Python 3K where
    new paradaigms are
    being examined.

Alternative Syntax
------------------

    yield, next, and send are redundant
    ------------------------------------
    With old style generators, g.next() and g.send( 1 ) are
    conceptually the same as "yield" and "yield 1" inside the
    generator. They both pass execution to the other side, and
    the second form passes a value. Yet they currently have
    different syntax. Once we have a baton object, we can get rid
    of one of these forms. g.next() is needed to support
    iterators. How about we keep baton.next() and baton.send( 1
    ). We get rid of yield completely.

    Use keyword to invoke a generator rather than declare
    ------------------------------------------------------------
    Perhaps instead of a "generator" keyword to denote the
    generator function, a "fork" keyword should be used to begin
    the second execution frame. For example:

        def f( baton ):
            # compute something
            baton.send( result )
            # compute something
            baton.send( result )

        baton = fork f()
        while True:
            print( baton.next() )

    or maybe the "yield" keyword can be used here:

        def f( baton ):
            # compute something
            baton.send( result )
            # compute something
            baton.send( result )

        baton = yield f
        while True:
            print( baton.next() )


From michel.metzger at gmail.com  Thu Mar 25 18:00:35 2010
From: michel.metzger at gmail.com (Michel)
Date: Thu, 25 Mar 2010 15:00:35 -0700 (PDT)
Subject: Create a class at run-time
Message-ID: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>

Hi everyone,

I'm trying to dynamically create a class. What I need is to define a
class, add methods to it and later instantiate this class. Methods
need to be bound to the instance though, and that's my problem. Here
is what I have so far:

method_template = "def test_foo(self):\
    #actual test_foo\
    pass"
exec method_template

TestClass = types.ClassType("MyTestClass", (unittest.TestCase, ), {})
TestClass.__module__ = "test"

now what to do next?
I looked at types.MethodType but it needs an instance to bind the
method and a function object.
Should I define __new__ to bind the method during instantiation?

Hope this makes sense,

Michel.


From john at castleamber.com  Thu Mar 25 18:13:49 2010
From: john at castleamber.com (John Bokma)
Date: Thu, 25 Mar 2010 16:13:49 -0600
Subject: XPCOM/hulahop: waiting for JavaScript finished?
Message-ID: <87sk7ohwwy.fsf@castleamber.com>


I am playing a bit with hulahop/xpcom using the code found at

http://www.advogato.org/article/1014.html

but have no idea how to check if some JavaScript has finised running.
The _loaded method of Browser is called after the document has finished
loading, but as far as I can tell this doesn't mean that the JavaScript
has finised setting things up.

Is there a way to either wait a few seconds in _loaded (fragile, of
course). time.sleep() (as expected) blocks.

Or better, is there a way to check if JavaScript has stopped running?
(Hmmm... thinking of it, this can also run on events, so maybe there is
no good way to do this?)

Thanks,

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From motoom at xs4all.nl  Thu Mar 25 18:18:17 2010
From: motoom at xs4all.nl (Michiel Overtoom)
Date: Thu, 25 Mar 2010 23:18:17 +0100
Subject: Create a class at run-time
In-Reply-To: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>
References: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>
Message-ID: <4BABE129.8010205@xs4all.nl>

On 2010-03-25 23:00, Michel wrote:

> I'm trying to dynamically create a class. What I need is to define a
> class, add methods to it and later instantiate this class. Methods
> need to be bound to the instance though, and that's my problem.

Maybe this snippet is of any help?

import functools

class Template(object):
     pass

def printmyname(self):
     print self.name

t=Template()
t.name="Pete"
t.printmyname=functools.partial(printmyname,t)

u=Template()
u.name="Mary"
u.printmyname=functools.partial(printmyname,u)

t.printmyname()
u.printmyname()

Greetings,


-- 
"The ability of the OSS process to collect and harness
the collective IQ of thousands of individuals across
the Internet is simply amazing." - Vinod Valloppillil
http://www.catb.org/~esr/halloween/halloween4.html


From egbertum at xs4all.nl  Thu Mar 25 18:28:48 2010
From: egbertum at xs4all.nl (egbert)
Date: Thu, 25 Mar 2010 23:28:48 +0100
Subject: from import and __init__.py
In-Reply-To: <hog3r2$8mr$1@dough.gmane.org>
References: <20100325101632.GA4727@xs4all.nl>
 <hog3r2$8mr$1@dough.gmane.org>
Message-ID: <20100325222848.GB13846@xs4all.nl>

On Thu, Mar 25, 2010 at 12:43:13PM -0400, Terry Reedy wrote:
> On 3/25/2010 6:16 AM, egbert wrote:
> >When I do 'from some_package import some_module'
> >the __init__.py of some_package will be run.
> >However, there will not be anything like a  package-module,
> >and the effects of __init__.py seem all to be lost. Is that true ?
> 
> No. If you do
> 
> from sys import modules
> print(modules.keys())
> 
> you will see both some_package and some_package.some_module among
> the entries. 
Yes, you are right. And I can reach everything with
modules['some_package']
or variants thereof.
Thanks,
egbert

-- 
Egbert Bouwman - Keizersgracht 197 II - 1016 DS  Amsterdam - 020 6257991
========================================================================


From pmaupin at gmail.com  Thu Mar 25 18:34:32 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Thu, 25 Mar 2010 15:34:32 -0700 (PDT)
Subject: Create a class at run-time
References: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>
Message-ID: <239b30ba-5465-4466-b2a6-6a5cf62e1028@35g2000yqm.googlegroups.com>

On Mar 25, 5:00?pm, Michel <michel.metz... at gmail.com> wrote:
> Hi everyone,
>
> I'm trying to dynamically create a class. What I need is to define a
> class, add methods to it and later instantiate this class. Methods
> need to be bound to the instance though, and that's my problem. Here
> is what I have so far:

Well, you should just fill your empty dict with function definitions,
BEFORE you build the class.  That's easiest.  Also, you can just use
type:

def foo(*whatever):
    print foo

bar = type('MyDynamicClass', (object,), dict(foo=foo))

HTH,
Pat


From james.harris.1 at googlemail.com  Thu Mar 25 18:40:33 2010
From: james.harris.1 at googlemail.com (James Harris)
Date: Thu, 25 Mar 2010 15:40:33 -0700 (PDT)
Subject: Python database of plain text editable by notepad or vi
Message-ID: <93d7991f-d688-4692-b34f-2fa571cebbdf@q15g2000yqj.googlegroups.com>

I am looking to store named pieces of text in a form that can be
edited by a standard editor such as notepad (under Windows) or vi
(under Unix) and then pulled into Python as needed. The usual record
locking and transactions of databases are not required.

Another way to look at it is to treat the separate files as entries in
a dictionary. The file name would be the key and the lines of the file
the value.

Anyone know of a database (with a Python interface) which will allow
text files to be treated as database fields? If not I can just write
it but I thought it best to ask if there was an existing solution
first.

James


From jkn_gg at nicorp.f9.co.uk  Thu Mar 25 18:55:20 2010
From: jkn_gg at nicorp.f9.co.uk (jkn)
Date: Thu, 25 Mar 2010 15:55:20 -0700 (PDT)
Subject: Python database of plain text editable by notepad or vi
References: <93d7991f-d688-4692-b34f-2fa571cebbdf@q15g2000yqj.googlegroups.com>
Message-ID: <c9ae2b99-8c92-4c82-81dc-db0b75a2b026@i25g2000yqm.googlegroups.com>

Kirbybase is one possibility.

    http://pypi.python.org/pypi/KirbyBase/1.9


    J^n



From joncle at googlemail.com  Thu Mar 25 18:56:22 2010
From: joncle at googlemail.com (Jon Clements)
Date: Thu, 25 Mar 2010 15:56:22 -0700 (PDT)
Subject: Python database of plain text editable by notepad or vi
References: <93d7991f-d688-4692-b34f-2fa571cebbdf@q15g2000yqj.googlegroups.com>
Message-ID: <46822448-2984-4ef6-85c7-bef834e2e86c@r1g2000yqj.googlegroups.com>

On 25 Mar, 22:40, James Harris <james.harri... at googlemail.com> wrote:
> I am looking to store named pieces of text in a form that can be
> edited by a standard editor such as notepad (under Windows) or vi
> (under Unix) and then pulled into Python as needed. The usual record
> locking and transactions of databases are not required.
>
> Another way to look at it is to treat the separate files as entries in
> a dictionary. The file name would be the key and the lines of the file
> the value.
>
> Anyone know of a database (with a Python interface) which will allow
> text files to be treated as database fields? If not I can just write
> it but I thought it best to ask if there was an existing solution
> first.
>
> James

I could be missing something here, but aren't you basically just
talking about an OS's filesystem?

glob or listdir somewhere, then create a dict using the file contents
would meet your criteria, with very little lines of code -- but I
would be interested to know what the use-case was for this... Is it
read completely at start up time, or if each file contains a large
amount of lines and aren't fixed width (or has no other indexing
support without maintenance), then is a complete sequential-scan
required each time, or do you just tell the user to not update when
running (unless I s'pose something along the lines of a SIGHUP for
config files is applicable).

Sorry, just don't understand why you'd want this.

Jon.


From sccolbert at gmail.com  Thu Mar 25 19:07:56 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Thu, 25 Mar 2010 19:07:56 -0400
Subject: nested threading
In-Reply-To: <4566e767-768f-4399-8a6b-5530ec90b03c@a37g2000prd.googlegroups.com>
References: <4566e767-768f-4399-8a6b-5530ec90b03c@a37g2000prd.googlegroups.com>
Message-ID: <7f014ea61003251607q7a3086adx90eb04a1a2861bce@mail.gmail.com>

Spawning a thread from within a thread works just fine. Calling
thread.start() is a non-blocking function and returns immediately.

On Thu, Mar 25, 2010 at 11:23 AM, Omer Ihsan <omrihsan at gmail.com> wrote:

> is there anything as "nested threading"....that is, call a thread from
> within a thread.
> in this case how will thread locking take place.
>
> for example initially there were two functions that were called using
> threading.Thread. these wont get unlocked unless both of them are done
> with whatever they need to do. if say function 2 calls another thread.
> then what??
>
> inquisitive....:-|
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From ldo at geek-central.gen.new_zealand  Thu Mar 25 19:16:39 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 26 Mar 2010 12:16:39 +1300
Subject: Sniffing encoding type by looking at file BOM header
References: <mailman.1139.1269442366.23598.python-list@python.org>
Message-ID: <hogqso$fto$1@lust.ihug.co.nz>

In message <mailman.1139.1269442366.23598.python-list at python.org>, 
python at bdurham.com wrote:

> BOM_UTF8     = '\xef\xbb\xbf'

Since when does UTF-8 need a BOM?


From irmen-NOSPAM- at xs4all.nl  Thu Mar 25 19:21:34 2010
From: irmen-NOSPAM- at xs4all.nl (Irmen de Jong)
Date: Fri, 26 Mar 2010 00:21:34 +0100
Subject: Sniffing encoding type by looking at file BOM header
In-Reply-To: <hogqso$fto$1@lust.ihug.co.nz>
References: <mailman.1139.1269442366.23598.python-list@python.org>
	<hogqso$fto$1@lust.ihug.co.nz>
Message-ID: <4babef80$0$22918$e4fe514c@news.xs4all.nl>

On 26-3-2010 0:16, Lawrence D'Oliveiro wrote:
> In message<mailman.1139.1269442366.23598.python-list at python.org>,
> python at bdurham.com wrote:
>
>> BOM_UTF8     = '\xef\xbb\xbf'
>
> Since when does UTF-8 need a BOM?

It doesn't, but it is allowed. Not recommended though.
Unfortunately several tools, such as notepad.exe, have a tendency of 
silently adding it when saving files.

-irmen



From martin.hellwig at dcuktec.org  Thu Mar 25 19:29:09 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Thu, 25 Mar 2010 23:29:09 +0000
Subject: Don't understand behavior; instance form a class in another class'
	instance
Message-ID: <hogrk1$17k$1@news.eternal-september.org>

Hi all,

When I run the following snippet (drastically simplified, to just show 
what I mean):
 >>
import platform, sys

class One(object):
     def __init__(self):
         self.one = True

     def change(self):
         self.one = False

class Two(object):
     def __init__(self):
         self._instance_one = One()
         self.one = self._instance_one.one
         self.change = self._instance_one.change

if __name__ == '__main__':
     print(sys.version)
     print(platform.machine())
     print(80*'#')
     TEST1 = One()
     print(TEST1.one)
     TEST1.change()
     print(TEST1.one)
     TEST1 = None
     print(80*'#')
     TEST2 = Two()
     print(TEST2.one)
     TEST2.change()
     print(TEST2.one
 >>

I get the following result:

<<
[GCC 4.2.1 20070719  [FreeBSD]]
amd64
################################################################################
True
False
################################################################################
True
True
################################################################################
<<

What I don't understand why in the second test, the last boolean is True 
instead of (what I expect) False.
Could somebody enlighten me please as this has bitten me before and I am 
confused by this behavior.

Thanks in advance

-- 
mph


From lists at cheimes.de  Thu Mar 25 19:41:57 2010
From: lists at cheimes.de (Christian Heimes)
Date: Fri, 26 Mar 2010 00:41:57 +0100
Subject: Don't understand behavior; instance form a class in another class'
	instance
In-Reply-To: <hogrk1$17k$1@news.eternal-september.org>
References: <hogrk1$17k$1@news.eternal-september.org>
Message-ID: <hogsc6$79k$1@dough.gmane.org>

Martin P. Hellwig schrieb:
> What I don't understand why in the second test, the last boolean is True 
> instead of (what I expect) False.
> Could somebody enlighten me please as this has bitten me before and I am 
> confused by this behavior.

Hint: TEST2.one is not a reference to TEST2.__instance_one.one. When you
alter TEST2.__instance_one.one you don't magically change TEST2.one,
too. Python doesn't have variables like C pointers. Python's copy by
object (or share by object) behavior can be understand as labels. The
label TEST2.one references the same object as TEST2.__instance_one.one
until you change where the label TEST2.__instance_one.one points to.

Christian



From martin.hellwig at dcuktec.org  Thu Mar 25 20:06:06 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Fri, 26 Mar 2010 00:06:06 +0000
Subject: Don't understand behavior; instance form a class in another class'
	instance
In-Reply-To: <mailman.1199.1269560532.23598.python-list@python.org>
References: <hogrk1$17k$1@news.eternal-september.org>
	<mailman.1199.1269560532.23598.python-list@python.org>
Message-ID: <hogtpa$2u8$1@news.eternal-september.org>

On 03/25/10 23:41, Christian Heimes wrote:
> Martin P. Hellwig schrieb:
>> What I don't understand why in the second test, the last boolean is True
>> instead of (what I expect) False.
>> Could somebody enlighten me please as this has bitten me before and I am
>> confused by this behavior.
>
> Hint: TEST2.one is not a reference to TEST2.__instance_one.one. When you
> alter TEST2.__instance_one.one you don't magically change TEST2.one,
> too. Python doesn't have variables like C pointers. Python's copy by
> object (or share by object) behavior can be understand as labels. The
> label TEST2.one references the same object as TEST2.__instance_one.one
> until you change where the label TEST2.__instance_one.one points to.
>
> Christian
>

Ah okay thanks for the explanation, Am I correct in thinking (please 
correct me if I mangle up the terminology and/or totally are in the 
wrong ballpark) that this is more or less because the label of the first 
class is to an object (boolean with value False)
and the label of the second class does not cascade to the first label 
for looking something up but instead during assignment sees that it is a 
label to an object instead of the object itself thus copies the label 
content instead?

I probably expected classes namespaces to behave in about the same way 
as lists and dictionaries do, don't know where I picked that up.

Thanks again,

-- 
mph


From ovidiudeac at gmail.com  Thu Mar 25 20:11:39 2010
From: ovidiudeac at gmail.com (Ovidiu Deac)
Date: Fri, 26 Mar 2010 02:11:39 +0200
Subject: python logging writes an empty file
Message-ID: <804cd4021003251711p5c1ec832pf2b98da8f19bef1e@mail.gmail.com>

Hi,

I have the following situation:

My application uses nosetests to discover&run the unittests. I pass
the log configuration file as --logging-config=logging.conf
Everything works just fine, the logs are printed as required by the
configuration file which makes me happy. I take this as a sign that my
logging.conf is correct

Then in my main script, which starts the production application, I
have this line:
logging.config.fileConfig("logging.conf")

The logging module is configured without errors BUT my output.log is
EMPTY. It's like all the messages are filtered.

If I configure logging like this:
    logging.basicConfig(level=logging.INFO,
              format='%(asctime)s %(name)-12s %(levelname)s: %(message)s',
              datefmt='%m-%d %H:%M:%S',
              filename=file,
              filemode='w')
Then the logs are printed ok.

Then I tried this:
    file = logging.FileHandler(logFileBasename, 'w')
    file.setLevel(logging.INFO)
    # set a format which is simpler for console use
    formatter = logging.Formatter('%(asctime)s %(name)-12s
%(levelname)-8s %(message)s',)
    # tell the handler to use this format
    file.setFormatter(formatter)
    # add the handler to the root logger
    logging.getLogger('').addHandler(file)
    logging.getLogger('')

...which also leaves my output file EMPTY.

I'm out of ideas. Can anybody help me with this?

Thanks in advance!
ovidiu

Here is my logging.conf:

[formatters]
keys: detailed,simple

[handlers]
keys: console,file

[loggers]
keys: root

[formatter_simple]
format: %(name)s:%(levelname)s:  %(message)s

[formatter_detailed]
format: %(name)s:%(levelname)s %(module)s:%(lineno)d:  %(message)s

[handler_console]
class: StreamHandler
args: []
formatter: detailed

[handler_file]
class=FileHandler
level=DEBUG
formatter=detailed
args=('output.log', 'w')
filename=output.log
mode=w

[logger_root]
level: INFO
handlers: file
propagate: 1


From cs at zip.com.au  Thu Mar 25 20:23:39 2010
From: cs at zip.com.au (Cameron Simpson)
Date: Fri, 26 Mar 2010 11:23:39 +1100
Subject: Revisiting Generators and Subgenerators
In-Reply-To: <bc11ef60-2d6e-46d7-94b4-ed2096834b33@f12g2000prn.googlegroups.com>
References: <bc11ef60-2d6e-46d7-94b4-ed2096834b33@f12g2000prn.googlegroups.com>
Message-ID: <20100326002339.GA18453@cskk.homeip.net>

On 25Mar2010 14:39, Winston <winstonw at stratolab.com> wrote:
| Here's my proposal again, but hopefully with better formatting so you
| can read it easier.

Having quickly read the Abstract and Motivation, why is this any better
than a pair of threads and a pair of Queue objects? (Aside from
co-routines being more lightweight in terms of machine resources?)

On the flipside, given that generators were recently augumented to
support coroutines I can see your motivation within that framework.

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

C makes it easy for you to shoot yourself in the foot.  C++ makes that
harder, but when you do, it blows away your whole leg.
- Bjarne Stroustrup


From andrej.mitrovich at gmail.com  Thu Mar 25 20:25:58 2010
From: andrej.mitrovich at gmail.com (Andrej Mitrovic)
Date: Thu, 25 Mar 2010 17:25:58 -0700 (PDT)
Subject: Traversing through Dir()
Message-ID: <d2459161-1a78-4380-8687-1497c9349a9d@g11g2000yqe.googlegroups.com>

I would like to traverse through the entire structure of dir(), and
write it to a file.

Now, if I try to write the contents of dir() to a file (via pickle), I
only get the top layer. So even if there are lists within the returned
list from dir(), they get written as a list of strings to the file.

Basically, I have an embedded and somewhat stripped version of Python.
I would like to find out just how much functionality it has (I have no
documentation for it), so I thought the best way to do that is
traverse thru the dir() call. Any clues as to how I could write the
whole structure to a file? I guess I'll need some kind of recursion
here. :)



From winstonw at stratolab.com  Thu Mar 25 20:31:24 2010
From: winstonw at stratolab.com (Winston Wolff)
Date: Thu, 25 Mar 2010 17:31:24 -0700
Subject: Revisiting Generators and Subgenerators
In-Reply-To: <20100326002339.GA18453@cskk.homeip.net>
References: <bc11ef60-2d6e-46d7-94b4-ed2096834b33@f12g2000prn.googlegroups.com>
	<20100326002339.GA18453@cskk.homeip.net>
Message-ID: <21283BA1-DFA5-4DD9-9478-89D0622F447C@stratolab.com>

Coroutines achieve very similar things to threads, but avoid problems resulting from the pre-emptive nature of threads. Specifically, a coroutine indicates where it will yield to the other coroutine. This avoids lots of problems related to synchronization. Also the lightweight aspect is apparently important for some simulations when they have many thousands of agents to simulate--this number of threads becomes a problem.

-Winston

Winston Wolff
Stratolab - Games for Learning
tel: (646) 827-2242
web: www.stratolab.com

On Mar 25, 2010, at 5:23 PM, Cameron Simpson wrote:

> 
> Having quickly read the Abstract and Motivation, why is this any better
> than a pair of threads and a pair of Queue objects? (Aside from
> co-routines being more lightweight in terms of machine resources?)
> 
> On the flipside, given that generators were recently augumented to
> support coroutines I can see your motivation within that framework.
> 
> Cheers,
> -- 
> Cameron Simpson <cs at zip.com.au> DoD#743
> http://www.cskk.ezoshosting.com/cs/
> 
> C makes it easy for you to shoot yourself in the foot.  C++ makes that
> harder, but when you do, it blows away your whole leg.
> - Bjarne Stroustrup



From jason.heeris at gmail.com  Thu Mar 25 20:49:30 2010
From: jason.heeris at gmail.com (Jason)
Date: Thu, 25 Mar 2010 17:49:30 -0700 (PDT)
Subject: Represent object type as
References: <6a6a37e3-f04f-4b63-9134-7ca9fd137297@f14g2000pre.googlegroups.com>
	<4bab888e$0$26553$426a74cc@news.free.fr>
Message-ID: <cb7c2b1d-d28e-4e28-9284-4d09c7c23167@u19g2000prh.googlegroups.com>

On Mar 26, 12:00?am, Bruno Desthuilliers <bruno.
42.desthuilli... at websiteburo.invalid> wrote:
> ? ? ? ? ? ?attrs['type'] = type(self)
>
> Do the same thing with less work !-)

Ah, silly me :P

> ? ? ?attrs['__typename__'] = type(self).__name__

That's exactly what I needed ? I was not aware of the "__name__"
attribute.

> Warning: won't be very useful if your code still uses old-style classes.

No, all the objects are new-style classes so that's fine.

> Depends on what you do with this dict, DBUS etc. And of your definition
> of "better", of course.

Simplest possible :P But this looks like it, so thanks very much :)

Cheers,
Jason


From anand.shashwat at gmail.com  Thu Mar 25 20:59:33 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Fri, 26 Mar 2010 06:29:33 +0530
Subject: Traversing through Dir()
In-Reply-To: <d2459161-1a78-4380-8687-1497c9349a9d@g11g2000yqe.googlegroups.com>
References: <d2459161-1a78-4380-8687-1497c9349a9d@g11g2000yqe.googlegroups.com>
Message-ID: <d4ab53de1003251759g68379f7ft8dd0b8678d1a2501@mail.gmail.com>

have you tried os.walk() ?

On Fri, Mar 26, 2010 at 5:55 AM, Andrej Mitrovic <andrej.mitrovich at gmail.com
> wrote:

> I would like to traverse through the entire structure of dir(), and
> write it to a file.
>
> Now, if I try to write the contents of dir() to a file (via pickle), I
> only get the top layer. So even if there are lists within the returned
> list from dir(), they get written as a list of strings to the file.
>
> Basically, I have an embedded and somewhat stripped version of Python.
> I would like to find out just how much functionality it has (I have no
> documentation for it), so I thought the best way to do that is
> traverse thru the dir() call. Any clues as to how I could write the
> whole structure to a file? I guess I'll need some kind of recursion
> here. :)
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From nocbos at gmail.com  Thu Mar 25 21:03:58 2010
From: nocbos at gmail.com (C. B.)
Date: Thu, 25 Mar 2010 18:03:58 -0700 (PDT)
Subject: Automatic import ?
Message-ID: <4d167b6b-04fb-42bb-9c21-ab66d0fb4367@k17g2000yqb.googlegroups.com>

Hi everyone,

I'm currently coding a C library which provides several modules and
objects.

Let's say that some of these objects are classes called AAA and BBB.
The constructor of AAA needs to get BBB as argument.

So I can run the following code :

from mymodule import AAA
from mymodule import BBB

a = AAA(BBB()))

But, as there is no case where AAA can be used without BBB, I would
like to avoid importing BBB in my Python scripts when I already import
AAA.

For now, I think that reproducing the behavior of the __init__.py file
could be a good way to do this, but how can I code that using only the
C API ?

Are there any other solutions ? Is this kind of importation a good
idea ?

Greetings,
Cyrille Bagard


From rhodri at wildebst.demon.co.uk  Thu Mar 25 21:10:36 2010
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 26 Mar 2010 01:10:36 -0000
Subject: Don't understand behavior; instance form a class in another
	class' instance
References: <hogrk1$17k$1@news.eternal-september.org>
	<mailman.1199.1269560532.23598.python-list@python.org>
	<hogtpa$2u8$1@news.eternal-september.org>
Message-ID: <op.u95hjyiya8ncjz@gnudebst>

On Fri, 26 Mar 2010 00:06:06 -0000, Martin P. Hellwig  
<martin.hellwig at dcuktec.org> wrote:

> On 03/25/10 23:41, Christian Heimes wrote:
>> Martin P. Hellwig schrieb:
>>> What I don't understand why in the second test, the last boolean is  
>>> True
>>> instead of (what I expect) False.
>>> Could somebody enlighten me please as this has bitten me before and I  
>>> am
>>> confused by this behavior.
>>
>> Hint: TEST2.one is not a reference to TEST2.__instance_one.one. When you
>> alter TEST2.__instance_one.one you don't magically change TEST2.one,
>> too. Python doesn't have variables like C pointers. Python's copy by
>> object (or share by object) behavior can be understand as labels. The
>> label TEST2.one references the same object as TEST2.__instance_one.one
>> until you change where the label TEST2.__instance_one.one points to.
>>
>> Christian
>>
>
> Ah okay thanks for the explanation, Am I correct in thinking (please  
> correct me if I mangle up the terminology and/or totally are in the  
> wrong ballpark) that this is more or less because the label of the first  
> class is to an object (boolean with value False)
> and the label of the second class does not cascade to the first label  
> for looking something up but instead during assignment sees that it is a  
> label to an object instead of the object itself thus copies the label  
> content instead?

Pretty much.  In the sense that you're thinking of, every assignment works  
that way, even the initial "TEST1 = One()".  Assignment binds names to  
objects, though you have to be aware that names can be such exotic things  
as "t", "a[15]" or "TEST2.__instance_one.one"

> I probably expected classes namespaces to behave in about the same way  
> as lists and dictionaries do, don't know where I picked that up.

They do, in fact, which isn't terribly surprising considering that class  
namespaces are implemented with dictionaries.  The distinction you're  
missing is that lists and dictionaries are mutable, while booleans aren't;  
you can change the contents of a dictionary, but you can't change the  
'contents' of a boolean.

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


From littlesweetmelon at gmail.com  Thu Mar 25 21:45:44 2010
From: littlesweetmelon at gmail.com (=?GB2312?B?zPC5zw==?=)
Date: Fri, 26 Mar 2010 09:45:44 +0800
Subject: Is there any library for indexing binary data?
In-Reply-To: <4babb132$0$22945$e4fe514c@news.xs4all.nl>
References: <mailman.1168.1269487743.23598.python-list@python.org>
	<4bab182a$0$22933$e4fe514c@news.xs4all.nl>
	<mailman.1177.1269510930.23598.python-list@python.org>
	<4babb132$0$22945$e4fe514c@news.xs4all.nl>
Message-ID: <cdb837ea1003251845u76e482c9ua8d16453e0007fdb@mail.gmail.com>

Many thanks for your kind reply. As you mentioned, a sparse array may
be the best choice.
Storing offset rather than payload itself can greatly save memory space.

1e7 queries per second is my ideal aim. But 1e6 must be achieved.
Currently I have implemented 5e6 on one PC (without incremental
indexing and all incoming queries coming from local data stream).
Since the table is very big and responding is time critical, the
finally system will be definitely distributed computing. I hope that
Judy algorithm can simplify indexing, so I can focus on implementing
data persistence and distributed computing affairs.

--
ShenLei

? 2010?3?26? ??2:55?Irmen de Jong <irmen-NOSPAM- at xs4all.nl> ???
> On 25-3-2010 10:55, ?? wrote:
>> Thank you irmen. I will take a look at pytable.
>> FYI, let me explain the case clearly.
>>
>> Originally, my big data table is simply array of Item:
>> struct Item
>> {
>>      long id;    // used as key
>>      BYTE payload[LEN];   // corresponding value with fixed length
>> };
>>
>> All items are stored in one file by using "stdio.h" function:
>>      fwrite(itemarray, sizeof(Item), num_of_items, fp);
>>
>> Note that "id" is randomly unique without any order. To speed up
>> searching  I regrouped / sorted them into two-level hash tables (in
>> the form of files).  I want to employ certain library to help me index
>> this table.
>>
>> Since the table contains about 10^9 items and LEN is about 2KB, it is
>> impossible to hold all data in memory. Furthermore, some new item may
>> be inserted into the array. Therefore incremental indexing feature is
>> needed.
>
> I see, I thought the payload data was small as well. What about this idea:
> Build a hash table where the keys are the id from your Item structs and
> the value is the file seek offset of the Item 'record' in your original
> datafile. (although that might generate values of type long, which take
> more memory than int, so maybe we should use file_offset/sizeof(Item).
> This way you can just keep your original data file (you only have to
> scan it to build the hash table) and you will avoid a lengthy conversion
> process.
>
> If this hashtable still doesn't fit in memory use a sparse array
> implementation of some sort that is more efficient at storing simple
> integers, or just put it into a database solution mentioned in earlier
> responses.
>
> Another thing: I think that your requirement of 1e7 lookups per second
> is a bit steep for any solution where the dataset is not in core memory
> at once though.
>
> Irmen.
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From ivlenin at gmail.com  Thu Mar 25 21:53:04 2010
From: ivlenin at gmail.com (I V)
Date: 26 Mar 2010 02:53:04 +0100
Subject: Create a class at run-time
References: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>
Message-ID: <4bac1380$1@news.x-privat.org>

On Thu, 25 Mar 2010 15:00:35 -0700, Michel wrote:
> I'm trying to dynamically create a class. What I need is to define a
> class, add methods to it and later instantiate this class. Methods need
> to be bound to the instance though, and that's my problem. Here is what
> I have so far:

I'm not entirely sure what you mean by binding methods to the instance. 
Do you mean you need to dynamically add methods to a specific instance? 
Or that you need to add methods to a class, such that they can be invoked 
on specific instances? For the latter, just do:

TestClass.test_foo = test_foo

For the former, try:

tc = TestClass()
tc.test_foo = types.MethodType(test_foo, tc)


From martin.hellwig at dcuktec.org  Thu Mar 25 21:56:38 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Fri, 26 Mar 2010 01:56:38 +0000
Subject: Don't understand behavior; instance form a class in another class'
	instance
In-Reply-To: <op.u95hjyiya8ncjz@gnudebst>
References: <hogrk1$17k$1@news.eternal-september.org>
	<mailman.1199.1269560532.23598.python-list@python.org>
	<hogtpa$2u8$1@news.eternal-september.org>
	<op.u95hjyiya8ncjz@gnudebst>
Message-ID: <hoh48g$ee7$1@news.eternal-september.org>

On 03/26/10 01:10, Rhodri James wrote:
<cut>
>
> Pretty much. In the sense that you're thinking of, every assignment
> works that way, even the initial "TEST1 = One()". Assignment binds names
> to objects, though you have to be aware that names can be such exotic
> things as "t", "a[15]" or "TEST2.__instance_one.one"
>
>> I probably expected classes namespaces to behave in about the same way
>> as lists and dictionaries do, don't know where I picked that up.
>
> They do, in fact, which isn't terribly surprising considering that class
> namespaces are implemented with dictionaries. The distinction you're
> missing is that lists and dictionaries are mutable, while booleans
> aren't; you can change the contents of a dictionary, but you can't
> change the 'contents' of a boolean.
>

All makes sense now, thanks Rhodri & Christian.

-- 
mph


From nagle at animats.com  Thu Mar 25 23:28:19 2010
From: nagle at animats.com (John Nagle)
Date: Thu, 25 Mar 2010 20:28:19 -0700
Subject: Is there any library for indexing binary data?
In-Reply-To: <mailman.1173.1269496428.23598.python-list@python.org>
References: <cdb837ea1003242028u7047f346l7d4f405b609b01ff@mail.gmail.com>	<op.u93v2thgx6zn5v@gabriel.sleipnir-bsas>
	<mailman.1173.1269496428.23598.python-list@python.org>
Message-ID: <4BAC29D3.6020503@animats.com>

?? wrote:
> Well, Database is not proper because 1. the table is very big (~10^9
> rows) 2. we should support very fast *simple* query that is to get
> value corresponding to single key (~10^7 queries / second).

   Ah, crypto rainbow tables.

					John Nagle


From pmaupin at gmail.com  Thu Mar 25 23:30:32 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Thu, 25 Mar 2010 20:30:32 -0700 (PDT)
Subject: Revisiting Generators and Subgenerators
References: <bc11ef60-2d6e-46d7-94b4-ed2096834b33@f12g2000prn.googlegroups.com>
	<20100326002339.GA18453@cskk.homeip.net>
	<mailman.1202.1269563496.23598.python-list@python.org>
Message-ID: <04e65930-889e-4eea-b12c-6bd21a11630a@z3g2000yqz.googlegroups.com>

On Mar 25, 7:31?pm, Winston Wolff <winst... at stratolab.com> wrote:

(a bunch of stuff about coroutines)

There have been proposals in the past for more full-featured
generators, that would work as general purpose coroutines.  Among
other things, there were issues with exception propagation, and the
design was deliberately simplified to what we have today.  Before
proposing anything in this area you should carefully read PEPs 288,
325, and 342, and all the discussion about those PEPs in the python-
dev archives.

After reading all that, and still being convinced that you have the
greatest thing since sliced bread (and that you REALLY understand all
the concerns about exceptions and other things), you need to update
your document to address all the concerns raised in the discussions on
those PEPs, put on your asbestos suit (modern asbestos-free
replacements never work as advertised), and then re-post your
document.

Personally, I am very interested in co-routines, but I have very
little time right now, and am not at all interested in reading a
proposal from somebody who doesn't know the full history of how
generators got to be the way they are (the lack of coroutines is not
an accidental oversight).  I suspect I am not alone in this opinion,
so there is probably some interest in a realistic proposal, but
perhaps also some skepticism about whether a realistic proposal can
actually be engineered...

Best regards and good luck!
Pat


From steve at REMOVE-THIS-cybersource.com.au  Fri Mar 26 00:20:45 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 26 Mar 2010 04:20:45 GMT
Subject: Automatic import ?
References: <4d167b6b-04fb-42bb-9c21-ab66d0fb4367@k17g2000yqb.googlegroups.com>
Message-ID: <4bac361d$0$8840$c3e8da3@news.astraweb.com>

On Thu, 25 Mar 2010 18:03:58 -0700, C. B. wrote:

> Hi everyone,
> 
> I'm currently coding a C library which provides several modules and
> objects.
> 
> Let's say that some of these objects are classes called AAA and BBB. The
> constructor of AAA needs to get BBB as argument.
> 
> So I can run the following code :
> 
> from mymodule import AAA
> from mymodule import BBB
> 
> a = AAA(BBB()))
> 
> But, as there is no case where AAA can be used without BBB, I would like
> to avoid importing BBB in my Python scripts when I already import AAA.

Since AAA must take an argument of BBB, then give it a default:

# in mymodule
def AAA(arg=BBB()):
    ...

# in another module
from mymodule import AAA
a = AAA()


Or do this:

from mymodule import AAA, BBB
a = AAA(BBB())




> For now, I think that reproducing the behavior of the __init__.py file
> could be a good way to do this, but how can I code that using only the C
> API ?

What is the behaviour of the __init__.py file?



-- 
Steven


From stefan_ml at behnel.de  Fri Mar 26 00:51:22 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 26 Mar 2010 05:51:22 +0100
Subject: Revisiting Generators and Subgenerators
In-Reply-To: <04e65930-889e-4eea-b12c-6bd21a11630a@z3g2000yqz.googlegroups.com>
References: <bc11ef60-2d6e-46d7-94b4-ed2096834b33@f12g2000prn.googlegroups.com>	<20100326002339.GA18453@cskk.homeip.net>	<mailman.1202.1269563496.23598.python-list@python.org>
	<04e65930-889e-4eea-b12c-6bd21a11630a@z3g2000yqz.googlegroups.com>
Message-ID: <hohega$i5f$1@dough.gmane.org>

Patrick Maupin, 26.03.2010 04:30:
> ... and then re-post your document.

... preferably to the python-ideas mailing list. Although it seems to me 
that this is something that could be explored as a library first - which 
usually means that people will tell you exactly that on python-ideas and 
ask you to come back with an implementation that has proven to be useful in 
practice.

Stefan



From v.harishankar at gmail.com  Fri Mar 26 02:37:24 2010
From: v.harishankar at gmail.com (Harishankar)
Date: Fri, 26 Mar 2010 12:07:24 +0530
Subject: Question regarding curses and text-input methods
Message-ID: <20100326120724.33e8c2a6@gmail.com>

I am trying to use Python curses.textpad to get (preferably UTF-8 but
not needed) input from the user in a python curses application, but I
realize that it is extremely limited and doesn't allow me to specify an
existing text to edit. Also it doesn't seem to provide scrolling
abilities on the window.

Is this at all possible to get a large chunk of text using curses
module like a GUI textbox or should I look at alternatives like newt?

I prefer curses because it's simple and very flexible, but I am lost
for ideas on this. Any ideas which doesn't involve throwing away the
whole curses interface would be appreciated.

-- 
V.Harishankar

http://literaryforums.org
http://harishankar.org


From kushal.kumaran+python at gmail.com  Fri Mar 26 03:40:26 2010
From: kushal.kumaran+python at gmail.com (Kushal Kumaran)
Date: Fri, 26 Mar 2010 13:10:26 +0530
Subject: Improved timedelta attributes/methods
In-Reply-To: <ded3be3b1003251251o69627c2ct6ed74020bad22c65@mail.gmail.com>
References: <ded3be3b1003251251o69627c2ct6ed74020bad22c65@mail.gmail.com>
Message-ID: <1e364c4e1003260040k1fe336d0lcf33577986f64075@mail.gmail.com>

2010/3/26 Christian ?tef?nescu <st.chris at gmail.com>:
> Hello dear Python-wielding developers!
>
> I generally like date/time handling in Python very much, especially how date
> operations result in Timedelta objects. But I find it somewhat impractical,
> that you can only get days, seconds and microseconds out of a time delta. I
> think it would be much more comfortable to have fields for minutes, hours,
> maybe also years, months. Is there a specific reasoning why this is not
> available?
>
> I would gladly do my best to implement such a solution, if it would make
> sense to the devs.
>

You might want to check out mxDateTime[1].  It has a RelativeDateTime
that seems to do what you like.

[1] http://www.egenix.com/products/python/mxBase/mxDateTime/doc/

-- 
regards,
kushal


From nocbos at gmail.com  Fri Mar 26 04:15:44 2010
From: nocbos at gmail.com (C. B.)
Date: Fri, 26 Mar 2010 01:15:44 -0700 (PDT)
Subject: Automatic import ?
References: 4bac361d$0$8840$c3e8da3@news.astraweb.com
Message-ID: <d61b8901-14c8-449b-9d4e-83dd0c372d80@15g2000yqi.googlegroups.com>


>
> What is the behaviour of the __init__.py file?
>

Not yet used, but I read this file is run by Python when a module of a
package is imported.

So you can insert default importations in it.




From alfps at start.no  Fri Mar 26 04:18:17 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Fri, 26 Mar 2010 09:18:17 +0100
Subject: Traversing through Dir()
In-Reply-To: <d2459161-1a78-4380-8687-1497c9349a9d@g11g2000yqe.googlegroups.com>
References: <d2459161-1a78-4380-8687-1497c9349a9d@g11g2000yqe.googlegroups.com>
Message-ID: <hohqgi$kso$1@news.eternal-september.org>

* Andrej Mitrovic:
> I would like to traverse through the entire structure of dir(), and
> write it to a file.
> 
> Now, if I try to write the contents of dir() to a file (via pickle), I
> only get the top layer. So even if there are lists within the returned
> list from dir(), they get written as a list of strings to the file.
> 
> Basically, I have an embedded and somewhat stripped version of Python.
> I would like to find out just how much functionality it has (I have no
> documentation for it), so I thought the best way to do that is
> traverse thru the dir() call. Any clues as to how I could write the
> whole structure to a file? I guess I'll need some kind of recursion
> here. :)

The built-in dir() function just produces a sequence of strings.

You can inspect the attributes via the getattr() function. The getattr() 
function produces a reference to an object (as does every expression). Problem: 
if you start with the number 42 and apply dir(), do getattr() on the first 
string, apply dir() on that object, and so on, with CPython you then get into an 
infinite recursion because those objects are produced on demand...


<code language="Py3">
obj = 42
obj_name = "42"
for n in range( 12 ):
     where = id( obj )
     t = type( obj ).__name__
     print( "{:>2} {:>10} {:20} of type '{}'".format( n, where, obj_name, t ) )
     attribute_names = dir( obj )
     obj_name = attribute_names[0]
     obj = getattr( obj, obj_name )
</code>


Similarly, if you do this with the Turtle module as starting point, with CPython 
you get into a different kind of infinite recursion because the chain of 
attributes so obtained is circular.


<code langauge="Py3">
import turtle

obj = turtle
obj_name = 'turtle'
for n in range( 12 ):
     where = id( obj )
     t = type( obj ).__name__
     print( "{:>2} {:>10} {:20} of type '{}'".format( n, where, obj_name, t ) )
     attribute_names = dir( obj )
     obj_name = attribute_names[0]
     obj = getattr( obj, obj_name )
</code>


It's not a clean, strict hierarchy of objects.

However, the basic idea is sound when you only want to obtain some limited, 
known information, such as e.g. short descriptions of all string methods, or a 
listing of the standard exception hierarchy.


<code language="Py3">
for attribute_name in dir( str ):
     if attribute_name.startswith( "_" ):
         pass
     else:
         attribute = getattr( str, attribute_name )
         doc_string = attribute.__doc__
         doc_lines = doc_string.splitlines()
         if len( doc_lines ) > 2:
             essential_doc = doc_lines[2]
         else:
             essential_doc = doc_lines[0]
         print( attribute_name.ljust( 15 ) + essential_doc )
</code>


<code language="Py3">
"Lists the standard exception class hierarchy with short descriptions."
import builtins
import inspect

indentation     = "." + 2*" "

def is_type( o ):
     # Could use inspect.isclass for this, but in the DIY spirit:
     return isinstance( o, type )

def beginning_of( s, max_chars ):
     return s[:max_chars]    # Not yet discussed, but doesn't matter.

def print_hierarchy( h, level ):
     for o in h:
         if isinstance( o, tuple ):
             # o is a tuple describing a class
             cls = o[0]
             doc_lines = cls.__doc__.splitlines()
             short_doc = beginning_of( doc_lines[0], 55 )
             print( "{:<34} {}".format(
                 level*indentation + cls.__name__, short_doc
                 ) )
         else:
             # o is a list array of subclasses
             print_hierarchy( o, level + 1 )

classes = []
for name in dir( builtins ):
     o = getattr( builtins, name )
     if is_type( o ):
         if issubclass( o, BaseException ):
             classes.append( o )

hierarchy = inspect.getclasstree( classes )
# 'hierarchy' is a list array of tuples and nested list arrays of the same form.
# The top level is an array of two items, the first item a tuple describing the 
'object'
# class, and the second item a list array representing the BaseException hierarchy.
print_hierarchy( hierarchy[1], level = 0 )
</code>


Cheers & hth.,

- Alf


From michele.simionato at gmail.com  Fri Mar 26 04:22:54 2010
From: michele.simionato at gmail.com (Michele Simionato)
Date: Fri, 26 Mar 2010 01:22:54 -0700 (PDT)
Subject: Advanced Python Programming Oxford Lectures [was: Re: *Advanced* 
	Python book?]
References: mailman.1182.1269520510.23598.python-list@python.org 
	<54e41616-df9f-42dd-9c91-9e530650bd99@j21g2000yqh.googlegroups.com>
Message-ID: <9dd0d6b0-7249-4a6f-8d03-b0c3a44eace2@l25g2000yqd.googlegroups.com>

On Mar 25, 2:24?pm, Michele Simionato <michele.simion... at gmail.com>
wrote:
> On Mar 25, 1:28?pm, Ethan Furman <et... at stoneleaf.us> wrote:
>
>
>
> > Michele,
>
> > Was wondering if you'd had a chance to re-post your lectures -- just did
> > a search for them and came up empty, and I would love to read them!
>
> > Many thanks in advance!
>
> Oops, I forgot! I will try to make them available soon.


Here they are: http://www.phyast.pitt.edu/~micheles/oxford-lectures.zip


From james.harris.1 at googlemail.com  Fri Mar 26 05:49:53 2010
From: james.harris.1 at googlemail.com (James Harris)
Date: Fri, 26 Mar 2010 02:49:53 -0700 (PDT)
Subject: Python database of plain text editable by notepad or vi
References: <93d7991f-d688-4692-b34f-2fa571cebbdf@q15g2000yqj.googlegroups.com>
	<46822448-2984-4ef6-85c7-bef834e2e86c@r1g2000yqj.googlegroups.com>
Message-ID: <3d897b92-9def-4339-ac19-b06b5fb9705e@e6g2000yqh.googlegroups.com>

On 25 Mar, 22:56, Jon Clements <jon... at googlemail.com> wrote:
> On 25 Mar, 22:40, James Harris <james.harri... at googlemail.com> wrote:
>
> > I am looking to store named pieces of text in a form that can be
> > edited by a standard editor such as notepad (under Windows) or vi
> > (under Unix) and then pulled into Python as needed. The usual record
> > locking and transactions of databases are not required.
>
> > Another way to look at it is to treat the separate files as entries in
> > a dictionary. The file name would be the key and the lines of the file
> > the value.
>
> > Anyone know of a database (with a Python interface) which will allow
> > text files to be treated as database fields? If not I can just write
> > it but I thought it best to ask if there was an existing solution
> > first.
...
> I could be missing something here, but aren't you basically just
> talking about an OS's filesystem?

For storage, yes. The files would be marked-up text stored in the
filesystem. The "dbms" (I use the term loosely!) would provide access
to them by some full or partial key mechanism yet to be determined.
Read-only access would do - at least for now.

> glob or listdir somewhere, then create a dict using the file contents
> would meet your criteria, with very little lines of code -- but I
> would be interested to know what the use-case was for this... Is it
> read completely at start up time, or if each file contains a large
> amount of lines and aren't fixed width (or has no other indexing
> support without maintenance), then is a complete sequential-scan
> required each time, or do you just tell the user to not update when
> running (unless I s'pose something along the lines of a SIGHUP for
> config files is applicable).

All good questions. For now, at least, the files can be read-only and
I'd want those on disk to be the master copies at all times. If I was
writing it myself I'd probably 'cache' some files in memory and stat
them before use. If newer I would reread the file.

>
> Sorry, just don't understand why you'd want this.

I tried to avoid boring folks with the details. I'm toying with some
ideas for a way to help generate source code (in various languages,
not just Python). If it goes ahead the text files would be mainly
marked-up code snippets - with or without symbols that need to be
replaced.

Rather than write one single monolithic app I thought to split it into
reusable components. One part being data access could perhaps be an
existing database (and I'll take a look at jkn's suggestion).

Think of the database as similar to an associative array stored on
disk. The only difference is I may want to play fast and loose with
the keys in some ways - e.g. check for partial key matches or return a
list of part-matched keys. The language name could be part of the key
but I'd also need to store variants for specific language versions.
I'm not sure yet how it will all pan out. As I say, just throwing
around some ideas.

James


From almar.klein at gmail.com  Fri Mar 26 05:52:51 2010
From: almar.klein at gmail.com (Almar Klein)
Date: Fri, 26 Mar 2010 10:52:51 +0100
Subject: Python database of plain text editable by notepad or vi
In-Reply-To: <93d7991f-d688-4692-b34f-2fa571cebbdf@q15g2000yqj.googlegroups.com>
References: <93d7991f-d688-4692-b34f-2fa571cebbdf@q15g2000yqj.googlegroups.com>
Message-ID: <p2gcc38d75f1003260252lfa0bcd4ah18b32daae19ded96@mail.gmail.com>

Hi,

On 25 March 2010 23:40, James Harris <james.harris.1 at googlemail.com> wrote:

> I am looking to store named pieces of text in a form that can be
> edited by a standard editor such as notepad (under Windows) or vi
> (under Unix) and then pulled into Python as needed. The usual record
> locking and transactions of databases are not required.
>

I wrote a file format and parser for Python and Matlab that enables saving
structured data in a human readable file. I use it to store all kinds of
scientific data, but also for ini-like files for certain applications.
Implementations and more information can be obtained here:
http://code.google.com/p/ssdf/

It's not a database in the sense that you can query it, but it might be
enough for your needs; it can store named pieces of (unicode) text.

Cheers,
  Almar
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From gandalf at shopzeus.com  Fri Mar 26 05:57:53 2010
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Fri, 26 Mar 2010 10:57:53 +0100
Subject: sqlite version on windows
Message-ID: <4BAC8521.2@shopzeus.com>


   Hi All,

On my Linux system: Python version: 2.6.2 sqlite3.sqlite_version: 3.6.10
On my Windows system: Python version: 2.6.5 sqlite3.sqlite_version: 3.5.9

Why is that? I wrote a program that uses SAVEPOINT/ROLLBACK to. It is 
only available in SQLite 3.6.8 and above. Can I install it on Windows 
somehow?

Thanks,

    Laszlo




From v.harishankar at gmail.com  Fri Mar 26 06:04:51 2010
From: v.harishankar at gmail.com (Harishankar)
Date: Fri, 26 Mar 2010 15:34:51 +0530
Subject: Python database of plain text editable by notepad or vi
In-Reply-To: <3d897b92-9def-4339-ac19-b06b5fb9705e@e6g2000yqh.googlegroups.com>
References: <93d7991f-d688-4692-b34f-2fa571cebbdf@q15g2000yqj.googlegroups.com>
	<46822448-2984-4ef6-85c7-bef834e2e86c@r1g2000yqj.googlegroups.com>
	<3d897b92-9def-4339-ac19-b06b5fb9705e@e6g2000yqh.googlegroups.com>
Message-ID: <20100326153451.1fae9524@gmail.com>

On Fri, 26 Mar 2010 02:49:53 -0700 (PDT)
James Harris <james.harris.1 at googlemail.com> wrote:

> On 25 Mar, 22:56, Jon Clements <jon... at googlemail.com> wrote:
> > On 25 Mar, 22:40, James Harris <james.harri... at googlemail.com>
> > wrote:
> >
> > > I am looking to store named pieces of text in a form that can be
> > > edited by a standard editor such as notepad (under Windows) or vi
> > > (under Unix) and then pulled into Python as needed. The usual
> > > record locking and transactions of databases are not required.
> >
> > > Another way to look at it is to treat the separate files as
> > > entries in a dictionary. The file name would be the key and the
> > > lines of the file the value.
> >
> > > Anyone know of a database (with a Python interface) which will
> > > allow text files to be treated as database fields? If not I can
> > > just write it but I thought it best to ask if there was an
> > > existing solution first.
> ...
> > I could be missing something here, but aren't you basically just
> > talking about an OS's filesystem?
> 
> For storage, yes. The files would be marked-up text stored in the
> filesystem. The "dbms" (I use the term loosely!) would provide access
> to them by some full or partial key mechanism yet to be determined.
> Read-only access would do - at least for now.
> 
> > glob or listdir somewhere, then create a dict using the file
> > contents would meet your criteria, with very little lines of code
> > -- but I would be interested to know what the use-case was for
> > this... Is it read completely at start up time, or if each file
> > contains a large amount of lines and aren't fixed width (or has no
> > other indexing support without maintenance), then is a complete
> > sequential-scan required each time, or do you just tell the user to
> > not update when running (unless I s'pose something along the lines
> > of a SIGHUP for config files is applicable).
> 
> All good questions. For now, at least, the files can be read-only and
> I'd want those on disk to be the master copies at all times. If I was
> writing it myself I'd probably 'cache' some files in memory and stat
> them before use. If newer I would reread the file.
> 
> >
> > Sorry, just don't understand why you'd want this.
> 
> I tried to avoid boring folks with the details. I'm toying with some
> ideas for a way to help generate source code (in various languages,
> not just Python). If it goes ahead the text files would be mainly
> marked-up code snippets - with or without symbols that need to be
> replaced.
> 
> Rather than write one single monolithic app I thought to split it into
> reusable components. One part being data access could perhaps be an
> existing database (and I'll take a look at jkn's suggestion).
> 
> Think of the database as similar to an associative array stored on
> disk. The only difference is I may want to play fast and loose with
> the keys in some ways - e.g. check for partial key matches or return a
> list of part-matched keys. The language name could be part of the key
> but I'd also need to store variants for specific language versions.
> I'm not sure yet how it will all pan out. As I say, just throwing
> around some ideas.
> 
> James

I am not sure exactly what you need, but would you consider using
something like ConfigParser module provided by Python? It appears to be
something similar to what you need.


-- 
V.Harishankar

http://literaryforums.org
http://harishankar.org


From james.harris.1 at googlemail.com  Fri Mar 26 06:12:57 2010
From: james.harris.1 at googlemail.com (James Harris)
Date: Fri, 26 Mar 2010 03:12:57 -0700 (PDT)
Subject: Python database of plain text editable by notepad or vi
References: mailman.1210.1269597926.23598.python-list@python.org
Message-ID: <df5021bf-46a8-40e0-9888-1bcce3d0dd48@15g2000yqi.googlegroups.com>

On 26 Mar, 10:04, Harishankar <v.harishan... at gmail.com> wrote:
...
> > Think of the database as similar to an associative array stored on
> > disk. The only difference is I may want to play fast and loose with
> > the keys in some ways - e.g. check for partial key matches or return a
> > list of part-matched keys. The language name could be part of the key
> > but I'd also need to store variants for specific language versions.
> > I'm not sure yet how it will all pan out. As I say, just throwing
> > around some ideas.
...
> I am not sure exactly what you need, but would you consider using
> something like ConfigParser module provided by Python? It appears to be
> something similar to what you need.

Thanks, I'll take a look at it.

James


From gandalf at shopzeus.com  Fri Mar 26 07:11:26 2010
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Fri, 26 Mar 2010 12:11:26 +0100
Subject: sqlite version on windows
In-Reply-To: <4BAC8521.2@shopzeus.com>
References: <4BAC8521.2@shopzeus.com>
Message-ID: <4BAC965E.70302@shopzeus.com>

2010.03.26. 10:57 keltez?ssel, Laszlo Nagy ?rta:
>
>   Hi All,
>
> On my Linux system: Python version: 2.6.2 sqlite3.sqlite_version: 3.6.10
> On my Windows system: Python version: 2.6.5 sqlite3.sqlite_version: 3.5.9
>
> Why is that? I wrote a program that uses SAVEPOINT/ROLLBACK to. It is 
> only available in SQLite 3.6.8 and above. Can I install it on Windows 
> somehow?
Hmm. Looks like I only needed to download a new sqlite3.dll file and put 
it into Python26\DLLs

Why it is not included in the standard distribution? The default 
installed version 3.5.9 is quite old.

Is there a special reason for that? Or do you think that I can post a patch?

Thanks,

    Laszlo





From ovidiudeac at gmail.com  Fri Mar 26 07:14:01 2010
From: ovidiudeac at gmail.com (Ovidiu Deac)
Date: Fri, 26 Mar 2010 13:14:01 +0200
Subject: Automatic import ?
In-Reply-To: <4d167b6b-04fb-42bb-9c21-ab66d0fb4367@k17g2000yqb.googlegroups.com>
References: <4d167b6b-04fb-42bb-9c21-ab66d0fb4367@k17g2000yqb.googlegroups.com>
Message-ID: <804cd4021003260414t5c5b7482vf315a2e596d3916c@mail.gmail.com>

> But, as there is no case where AAA can be used without BBB, I would
> like to avoid importing BBB in my Python scripts when I already import
> AAA.

Then why do you need to explicitely pass BBB() to AAA constructor? You
could leave AAA constructor with no parameters or with a parameter
with a default BBB() value


From steve at holdenweb.com  Fri Mar 26 07:49:25 2010
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 26 Mar 2010 07:49:25 -0400
Subject: Revisiting Generators and Subgenerators
In-Reply-To: <bc11ef60-2d6e-46d7-94b4-ed2096834b33@f12g2000prn.googlegroups.com>
References: <bc11ef60-2d6e-46d7-94b4-ed2096834b33@f12g2000prn.googlegroups.com>
Message-ID: <hoi705$qd4$1@dough.gmane.org>

Winston wrote:
[...]
>     This new syntax for a generator will break all existing
>     programs. But we happen to be at the start of Python 3K where
>     new paradaigms are
>     being examined.

However good your idea may be, I suspect this one sentence will kill it.

We are no longer "at the start of Py3k", we are moving towards the third
release, and there is already a substantial body of code and literature
embodying the current syntax.

So you would need to reformulate your proposals to incorporate backward
compatibility.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From jeanmichel at sequans.com  Fri Mar 26 08:35:58 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 26 Mar 2010 13:35:58 +0100
Subject: Automatic import ?
In-Reply-To: <4d167b6b-04fb-42bb-9c21-ab66d0fb4367@k17g2000yqb.googlegroups.com>
References: <4d167b6b-04fb-42bb-9c21-ab66d0fb4367@k17g2000yqb.googlegroups.com>
Message-ID: <4BACAA2E.6010402@sequans.com>

C. B. wrote:
> Hi everyone,
>
> I'm currently coding a C library which provides several modules and
> objects.
>
> Let's say that some of these objects are classes called AAA and BBB.
> The constructor of AAA needs to get BBB as argument.
>
> So I can run the following code :
>
> from mymodule import AAA
> from mymodule import BBB
>
> a = AAA(BBB()))
>
> But, as there is no case where AAA can be used without BBB, I would
> like to avoid importing BBB in my Python scripts when I already import
> AAA.
>
> For now, I think that reproducing the behavior of the __init__.py file
> could be a good way to do this, but how can I code that using only the
> C API ?
>
> Are there any other solutions ? Is this kind of importation a good
> idea ?
>
> Greetings,
> Cyrille Bagard
>   
Make AAA do the call to BBB:

def AAA(*args, **kwargs):
    param = BBB(*args, **kwargs)
    # more code

from mymodule import AAA

AAA(1,2,3) # list of parameters you would have used with BBB.

Saying that, is there any strong reason (meaning design issue) why you don't want to import explicitly BBB ?
Because if the reason is 'It takes too much time', then it's a bad reason.

Cheers,

JM






From philip at semanchuk.com  Fri Mar 26 08:57:47 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Fri, 26 Mar 2010 08:57:47 -0400
Subject: sqlite version on windows
In-Reply-To: <4BAC8521.2@shopzeus.com>
References: <4BAC8521.2@shopzeus.com>
Message-ID: <F9B601F5-CB92-4936-9C4D-7CFC0A41FA21@semanchuk.com>


On Mar 26, 2010, at 5:57 AM, Laszlo Nagy wrote:

>
>  Hi All,
>
> On my Linux system: Python version: 2.6.2 sqlite3.sqlite_version:  
> 3.6.10
> On my Windows system: Python version: 2.6.5 sqlite3.sqlite_version:  
> 3.5.9
>
> Why is that? I wrote a program that uses SAVEPOINT/ROLLBACK to. It  
> is only available in SQLite 3.6.8 and above. Can I install it on  
> Windows somehow?

I did a little research on this for Python 2.5. What I found is that  
The Python distributions for Windows from python.org are conservative  
with their SQLite version. For instance, Python 2.5.0 and 2.5.4 ship  
with the exact same SQLite version (3.3.4, from February 2006).

Our application dependencies state a minimum Python of 2.5. We have to  
work with the lowest common denominator (2.5.0), so we can't use any  
SQLite features that showed up after 3.3.4.

The few Linux distros that I checked are much more aggressive about  
bundling newer versions of SQLite. For instance, Ubuntu 8.04 has  
Python 2.5.2 with SQLite 3.4.2, while Ubuntu 8.10 has the same version  
of Python but offers SQLite 3.5.9.

You asked "why" and I don't know. I imagine it comes down to  
philosophical differences or maybe just a lack of time to test when  
building new WIndows distros for Python.org.

bye
Philip


From luismgz at gmail.com  Fri Mar 26 09:14:49 2010
From: luismgz at gmail.com (=?ISO-8859-1?Q?Luis_M=2E_Gonz=E1lez?=)
Date: Fri, 26 Mar 2010 06:14:49 -0700 (PDT)
Subject: OT: Meaning of "monkey"
Message-ID: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>

Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...

Monkeys everywhere.
Sorry for the off topic question, but what does "monkey" mean in a
nerdy-geek context??

Luis


From v.harishankar at gmail.com  Fri Mar 26 09:23:25 2010
From: v.harishankar at gmail.com (Harishankar)
Date: Fri, 26 Mar 2010 13:23:25 +0000 (UTC)
Subject: Have you embraced Python 3.x yet?
Message-ID: <hoicgd$23v0$1@news.telesweet.net>

Have you people embraced Python 3.x or still with 2.5 or 2.6? 

I personally want to switch over but not too sure how many people are 
using 3.x as opposed to 2 so I want to keep my programs compatible for 
the majority.

-- Hari


From kushal.kumaran+python at gmail.com  Fri Mar 26 09:25:41 2010
From: kushal.kumaran+python at gmail.com (Kushal Kumaran)
Date: Fri, 26 Mar 2010 18:55:41 +0530
Subject: OT: Meaning of "monkey"
In-Reply-To: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
Message-ID: <1e364c4e1003260625u4e747b23g566b0082cb24b6b6@mail.gmail.com>

2010/3/26 Luis M. Gonz?lez <luismgz at gmail.com>:
> Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
> Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
>
> Monkeys everywhere.
> Sorry for the off topic question, but what does "monkey" mean in a
> nerdy-geek context??
>

These might help you get the gist:

http://www.catb.org/~esr/jargon/html/C/code-monkey.html
http://www.catb.org/~esr/jargon/html/T/tape-monkey.html

-- 
regards,
kushal


From mehgcap at gmail.com  Fri Mar 26 09:29:05 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Fri, 26 Mar 2010 09:29:05 -0400
Subject: Have you embraced Python 3.x yet?
In-Reply-To: <hoicgd$23v0$1@news.telesweet.net>
References: <hoicgd$23v0$1@news.telesweet.net>
Message-ID: <bc7f680c1003260629m44b3d511rc06012d367ec92cd@mail.gmail.com>

Because of compatibility, and many modules being built for 2.6 only, I
am still on 2.6.4 (updating to .5 soon).

On 3/26/10, Harishankar <v.harishankar at gmail.com> wrote:
> Have you people embraced Python 3.x or still with 2.5 or 2.6?
>
> I personally want to switch over but not too sure how many people are
> using 3.x as opposed to 2 so I want to keep my programs compatible for
> the majority.
>
> -- Hari
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From neilc at norwich.edu  Fri Mar 26 09:34:35 2010
From: neilc at norwich.edu (Neil Cerutti)
Date: 26 Mar 2010 13:34:35 GMT
Subject: Have you embraced Python 3.x yet?
References: <hoicgd$23v0$1@news.telesweet.net>
Message-ID: <813rfbFi0kU1@mid.individual.net>

On 2010-03-26, Harishankar <v.harishankar at gmail.com> wrote:
> Have you people embraced Python 3.x or still with 2.5 or 2.6? 
>
> I personally want to switch over but not too sure how many
> people are using 3.x as opposed to 2 so I want to keep my
> programs compatible for the majority.

I switched 6 months ago, or so. My library needs are met by
what's in CPython, so I couldn't see, at the time, a good reason
to sit still.

My programs didn't take much effort to convert. They are nearly
all data conversion programs. Microsoft rendering the one outside
module I did use, an Excel reader, obsolete caused me a lot more
trouble than switching from 2.5 to 3.1.

Past advice in this forum has been that as long as you don't
depend on libraries that don't yet support Python 3, you can
probably switch over and not need to look back.

-- 
Neil Cerutti


From anand.shashwat at gmail.com  Fri Mar 26 09:35:54 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Fri, 26 Mar 2010 19:05:54 +0530
Subject: OT: Meaning of "monkey"
In-Reply-To: <1e364c4e1003260625u4e747b23g566b0082cb24b6b6@mail.gmail.com>
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
	<1e364c4e1003260625u4e747b23g566b0082cb24b6b6@mail.gmail.com>
Message-ID: <d4ab53de1003260635j64e8e333ra382e12ab50518d1@mail.gmail.com>

evolved monkey = human (can relate codemonkey to it)

2010/3/26 Kushal Kumaran
<kushal.kumaran+python at gmail.com<kushal.kumaran%2Bpython at gmail.com>
>

> 2010/3/26 Luis M. Gonz?lez <luismgz at gmail.com>:
> > Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
> > Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
> >
> > Monkeys everywhere.
> > Sorry for the off topic question, but what does "monkey" mean in a
> > nerdy-geek context??
> >
>
> These might help you get the gist:
>
> http://www.catb.org/~esr/jargon/html/C/code-monkey.html
> http://www.catb.org/~esr/jargon/html/T/tape-monkey.html
>
> --
> regards,
> kushal
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From anand.shashwat at gmail.com  Fri Mar 26 09:37:13 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Fri, 26 Mar 2010 19:07:13 +0530
Subject: Have you embraced Python 3.x yet?
In-Reply-To: <bc7f680c1003260629m44b3d511rc06012d367ec92cd@mail.gmail.com>
References: <hoicgd$23v0$1@news.telesweet.net>
	<bc7f680c1003260629m44b3d511rc06012d367ec92cd@mail.gmail.com>
Message-ID: <d4ab53de1003260637t63ecf069t6bf030ff1116873d@mail.gmail.com>

2.6.x is what most applications rely on. It is still too early for python 3

On Fri, Mar 26, 2010 at 6:59 PM, Alex Hall <mehgcap at gmail.com> wrote:

> Because of compatibility, and many modules being built for 2.6 only, I
> am still on 2.6.4 (updating to .5 soon).
>
> On 3/26/10, Harishankar <v.harishankar at gmail.com> wrote:
> > Have you people embraced Python 3.x or still with 2.5 or 2.6?
> >
> > I personally want to switch over but not too sure how many people are
> > using 3.x as opposed to 2 so I want to keep my programs compatible for
> > the majority.
> >
> > -- Hari
> > --
> > http://mail.python.org/mailman/listinfo/python-list
> >
>
>
> --
> Have a great day,
> Alex (msg sent from GMail website)
> mehgcap at gmail.com; http://www.facebook.com/mehgcap
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From anand.shashwat at gmail.com  Fri Mar 26 09:37:13 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Fri, 26 Mar 2010 19:07:13 +0530
Subject: Have you embraced Python 3.x yet?
In-Reply-To: <bc7f680c1003260629m44b3d511rc06012d367ec92cd@mail.gmail.com>
References: <hoicgd$23v0$1@news.telesweet.net>
	<bc7f680c1003260629m44b3d511rc06012d367ec92cd@mail.gmail.com>
Message-ID: <d4ab53de1003260637t63ecf069t6bf030ff1116873d@mail.gmail.com>

2.6.x is what most applications rely on. It is still too early for python 3

On Fri, Mar 26, 2010 at 6:59 PM, Alex Hall <mehgcap at gmail.com> wrote:

> Because of compatibility, and many modules being built for 2.6 only, I
> am still on 2.6.4 (updating to .5 soon).
>
> On 3/26/10, Harishankar <v.harishankar at gmail.com> wrote:
> > Have you people embraced Python 3.x or still with 2.5 or 2.6?
> >
> > I personally want to switch over but not too sure how many people are
> > using 3.x as opposed to 2 so I want to keep my programs compatible for
> > the majority.
> >
> > -- Hari
> > --
> > http://mail.python.org/mailman/listinfo/python-list
> >
>
>
> --
> Have a great day,
> Alex (msg sent from GMail website)
> mehgcap at gmail.com; http://www.facebook.com/mehgcap
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From jeanmichel at sequans.com  Fri Mar 26 09:53:26 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 26 Mar 2010 14:53:26 +0100
Subject: python logging writes an empty file
In-Reply-To: <804cd4021003251711p5c1ec832pf2b98da8f19bef1e@mail.gmail.com>
References: <804cd4021003251711p5c1ec832pf2b98da8f19bef1e@mail.gmail.com>
Message-ID: <4BACBC56.1020105@sequans.com>

Ovidiu Deac wrote:
> Then I tried this:
>     file = logging.FileHandler(logFileBasename, 'w')
>     file.setLevel(logging.INFO)
>     # set a format which is simpler for console use
>     formatter = logging.Formatter('%(asctime)s %(name)-12s
> %(levelname)-8s %(message)s',)
>     # tell the handler to use this format
>     file.setFormatter(formatter)
>     # add the handler to the root logger
>     logging.getLogger('').addHandler(file)
>     logging.getLogger('')
>
> ...which also leaves my output file EMPTY.
>
> I'm out of ideas. Can anybody help me with this?
>
> Thanks in advance!
> ovidiu
>   
You set le level of your handler, but did not set the level of the 
logger itself.
Replace file.setLevel(logging.INFO) by 
logging.getLogger().setLevel(logging.INFO)

Log events are matched versus the logger level 1st, then the handler 
level (if applicable). Most of the time you don't need to tune your 
handler levels.

JM



From incensedprey at gmail.com  Fri Mar 26 10:05:52 2010
From: incensedprey at gmail.com (Kevin Adams)
Date: Fri, 26 Mar 2010 07:05:52 -0700 (PDT)
Subject: [python3]
References: <e6ed708b-c010-451d-8de7-8a885c788d4b@t20g2000yqe.googlegroups.com>
	<ho0f44$7m8$1@dough.gmane.org>
	<mailman.984.1269025399.23598.python-list@python.org>
Message-ID: <f8aefa16-b634-4f39-afe1-beb8d30d553a@q23g2000yqd.googlegroups.com>

On Mar 19, 3:02?pm, Terry Reedy <tjre... at udel.edu> wrote:
> On 3/19/2010 2:17 PM, Steve Holden wrote:
>
>
>
> > Kevin Adams wrote:
> >> Greetings!
>
> >> Please forgive me if im posting this to the wrong group.
>
> >> I'm new to Python, learning Python3 from the O'rielly "Learning
> >> Python" book. ?Reading
> >> about operator overloading, specifically __getitem__. ? I put together
> >> a small bit of code to
> >> do some experimenting and threw in a timer so i can see it do its
> >> thing. ?For some reason
> >> the time.sleep(x) function doesnt work when my print function includes
> >> "end=''".
>
> >> Thanks in advance for any help.
>
> > Try the following changes:
>
> >> ---code---
>
> >> class TestClass():
> >> ? ? ?def __init__(self):
> >> ? ? ? ? ?self.data = "I was far from home and the spell of the eastern
> >> sea was upon me."
>
> >> ? ? ?def __getitem__(self,i):
> >> ? ? ? ? ?return self.data[i]
>
> >> import time
>
> > import sys
>
> >> if __name__ == "__main__":
>
> >> ? ? ?me = TestClass()
> >> ? ? ?for x in me:
> >> ? ? ? ? ?print(x,end='') ?#if i remove the 'end=''' ?it performs as i'd
> >> expect
> > ? ? ? ? ? ?sys.stdout.flush()
>
> >> ? ? ? ? ?time.sleep(int(2))
>
> > It may just be that the output is being held in buffers until the
> > program terminates. the fluch() methof pushes it straight out.
>
> The IDLE Shell window must get print output back from the pythonw
> process without buffering. When I cut and pasted from IDLE editor to
> standard interpreter window, output was bunched after several seconds.
> OP should have started with short string and minimal delay so output
> would not take a whole minute. Flushing fixed problem in standard
> interpreter. I will have to remember that testing partial line output in
> IDLE does not show how it will act elsewhere.
>
> Kevin: when reporting a problem, be more specific as to what 'does not
> work' means.
>
> Terry Jan Reedy

Terry:  Will definately try to be more informative next time.   Thanks
again.

K


From andrej.mitrovich at gmail.com  Fri Mar 26 10:16:47 2010
From: andrej.mitrovich at gmail.com (Andrej Mitrovic)
Date: Fri, 26 Mar 2010 07:16:47 -0700 (PDT)
Subject: Traversing through Dir()
References: <d2459161-1a78-4380-8687-1497c9349a9d@g11g2000yqe.googlegroups.com>
	<hohqgi$kso$1@news.eternal-september.org>
Message-ID: <d0fa7167-86e7-4ffa-953e-67b3c07b5f2d@q21g2000yqm.googlegroups.com>

On Mar 26, 9:18?am, "Alf P. Steinbach" <al... at start.no> wrote:
> * Andrej Mitrovic:
>
> > I would like to traverse through the entire structure of dir(), and
> > write it to a file.
>
> > Now, if I try to write the contents of dir() to a file (via pickle), I
> > only get the top layer. So even if there are lists within the returned
> > list from dir(), they get written as a list of strings to the file.
>
> > Basically, I have an embedded and somewhat stripped version of Python.
> > I would like to find out just how much functionality it has (I have no
> > documentation for it), so I thought the best way to do that is
> > traverse thru the dir() call. Any clues as to how I could write the
> > whole structure to a file? I guess I'll need some kind of recursion
> > here. :)
>
> The built-in dir() function just produces a sequence of strings.
>
> You can inspect the attributes via the getattr() function. The getattr()
> function produces a reference to an object (as does every expression). Problem:
> if you start with the number 42 and apply dir(), do getattr() on the first
> string, apply dir() on that object, and so on, with CPython you then get into an
> infinite recursion because those objects are produced on demand...
>
> <code language="Py3">
> obj = 42
> obj_name = "42"
> for n in range( 12 ):
> ? ? ?where = id( obj )
> ? ? ?t = type( obj ).__name__
> ? ? ?print( "{:>2} {:>10} {:20} of type '{}'".format( n, where, obj_name, t ) )
> ? ? ?attribute_names = dir( obj )
> ? ? ?obj_name = attribute_names[0]
> ? ? ?obj = getattr( obj, obj_name )
> </code>
>
> Similarly, if you do this with the Turtle module as starting point, with CPython
> you get into a different kind of infinite recursion because the chain of
> attributes so obtained is circular.
>
> <code langauge="Py3">
> import turtle
>
> obj = turtle
> obj_name = 'turtle'
> for n in range( 12 ):
> ? ? ?where = id( obj )
> ? ? ?t = type( obj ).__name__
> ? ? ?print( "{:>2} {:>10} {:20} of type '{}'".format( n, where, obj_name, t ) )
> ? ? ?attribute_names = dir( obj )
> ? ? ?obj_name = attribute_names[0]
> ? ? ?obj = getattr( obj, obj_name )
> </code>
>
> It's not a clean, strict hierarchy of objects.
>
> However, the basic idea is sound when you only want to obtain some limited,
> known information, such as e.g. short descriptions of all string methods, or a
> listing of the standard exception hierarchy.
>
> <code language="Py3">
> for attribute_name in dir( str ):
> ? ? ?if attribute_name.startswith( "_" ):
> ? ? ? ? ?pass
> ? ? ?else:
> ? ? ? ? ?attribute = getattr( str, attribute_name )
> ? ? ? ? ?doc_string = attribute.__doc__
> ? ? ? ? ?doc_lines = doc_string.splitlines()
> ? ? ? ? ?if len( doc_lines ) > 2:
> ? ? ? ? ? ? ?essential_doc = doc_lines[2]
> ? ? ? ? ?else:
> ? ? ? ? ? ? ?essential_doc = doc_lines[0]
> ? ? ? ? ?print( attribute_name.ljust( 15 ) + essential_doc )
> </code>
>
> <code language="Py3">
> "Lists the standard exception class hierarchy with short descriptions."
> import builtins
> import inspect
>
> indentation ? ? = "." + 2*" "
>
> def is_type( o ):
> ? ? ?# Could use inspect.isclass for this, but in the DIY spirit:
> ? ? ?return isinstance( o, type )
>
> def beginning_of( s, max_chars ):
> ? ? ?return s[:max_chars] ? ?# Not yet discussed, but doesn't matter.
>
> def print_hierarchy( h, level ):
> ? ? ?for o in h:
> ? ? ? ? ?if isinstance( o, tuple ):
> ? ? ? ? ? ? ?# o is a tuple describing a class
> ? ? ? ? ? ? ?cls = o[0]
> ? ? ? ? ? ? ?doc_lines = cls.__doc__.splitlines()
> ? ? ? ? ? ? ?short_doc = beginning_of( doc_lines[0], 55 )
> ? ? ? ? ? ? ?print( "{:<34} {}".format(
> ? ? ? ? ? ? ? ? ?level*indentation + cls.__name__, short_doc
> ? ? ? ? ? ? ? ? ?) )
> ? ? ? ? ?else:
> ? ? ? ? ? ? ?# o is a list array of subclasses
> ? ? ? ? ? ? ?print_hierarchy( o, level + 1 )
>
> classes = []
> for name in dir( builtins ):
> ? ? ?o = getattr( builtins, name )
> ? ? ?if is_type( o ):
> ? ? ? ? ?if issubclass( o, BaseException ):
> ? ? ? ? ? ? ?classes.append( o )
>
> hierarchy = inspect.getclasstree( classes )
> # 'hierarchy' is a list array of tuples and nested list arrays of the same form.
> # The top level is an array of two items, the first item a tuple describing the
> 'object'
> # class, and the second item a list array representing the BaseException hierarchy.
> print_hierarchy( hierarchy[1], level = 0 )
> </code>
>
> Cheers & hth.,
>
> - Alf

Thanks for all of that. And yes, I've noticed I get into infinite
recursions all the time, which is why I was asking if there was a
simple way to do this. I'll have a look at these later.

Kind regards,
Andrej Mitrovic


From andrej.mitrovich at gmail.com  Fri Mar 26 10:22:40 2010
From: andrej.mitrovich at gmail.com (Andrej Mitrovic)
Date: Fri, 26 Mar 2010 07:22:40 -0700 (PDT)
Subject: Have you embraced Python 3.x yet?
References: <hoicgd$23v0$1@news.telesweet.net>
Message-ID: <d0515b95-df2e-4c9c-a9e7-4a1a16437870@r27g2000yqn.googlegroups.com>

I use both, really. I started by learning and using Python 3, but I
ended up using Python 2 much more often compared to Py3. Not because
of the functionality of the language, but because most software that
embeds Python or is extendable in some way is usually using Python 2.
+ There's the whole libraries issue (or the lack of them).

But I have to say, Python 3 is a sexy language, I can't wait for more
libraries to appear so I could focus more of my attention there.


From kw at codebykevin.com  Fri Mar 26 10:28:12 2010
From: kw at codebykevin.com (Kevin Walzer)
Date: Fri, 26 Mar 2010 10:28:12 -0400
Subject: Have you embraced Python 3.x yet?
In-Reply-To: <hoicgd$23v0$1@news.telesweet.net>
References: <hoicgd$23v0$1@news.telesweet.net>
Message-ID: <5dda4$4bacc47c$4275d90a$1703@FUSE.NET>

On 3/26/10 9:23 AM, Harishankar wrote:
> Have you people embraced Python 3.x or still with 2.5 or 2.6?
>
> I personally want to switch over but not too sure how many people are
> using 3.x as opposed to 2 so I want to keep my programs compatible for
> the majority.
>
> -- Hari

Not yet. Some key libraries I am using for apps under development 
haven't been ported to support 3.x yet (feedparser, pycrypto).

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


From ovidiudeac at gmail.com  Fri Mar 26 10:29:43 2010
From: ovidiudeac at gmail.com (Ovidiu Deac)
Date: Fri, 26 Mar 2010 16:29:43 +0200
Subject: python logging writes an empty file
In-Reply-To: <4BACBC56.1020105@sequans.com>
References: <804cd4021003251711p5c1ec832pf2b98da8f19bef1e@mail.gmail.com>
	<4BACBC56.1020105@sequans.com>
Message-ID: <804cd4021003260729t150ffdd3m1f30fc1bdea138ca@mail.gmail.com>

> You set le level of your handler, but did not set the level of the logger
> itself.
> Replace file.setLevel(logging.INFO) by
> logging.getLogger().setLevel(logging.INFO)
>
> Log events are matched versus the logger level 1st, then the handler level
> (if applicable). Most of the time you don't need to tune your handler
> levels.

Right. Thanks a lot!!!

Now for the second part, any idea why logging.config.fileConfig doesn't work?

Now the logging.conf looks like this:

[formatters]
keys: detailed

[handlers]
keys: console,file

[loggers]
keys: root

[formatter_detailed]
format: %(name)s:%(levelname)s %(module)s:%(lineno)d:  %(message)s

[handler_console]
class: StreamHandler
args: []
formatter: detailed

[handler_file]
class=FileHandler
formatter=detailed
args=('output.log', 'w')
filename=output.log
mode=w

[logger_root]
level: INFO
handlers: file


From seb.binet at gmail.com  Fri Mar 26 10:29:57 2010
From: seb.binet at gmail.com (Sebastien Binet)
Date: Fri, 26 Mar 2010 07:29:57 -0700 (PDT)
Subject: Revisiting Generators and Subgenerators
References: <bc11ef60-2d6e-46d7-94b4-ed2096834b33@f12g2000prn.googlegroups.com>
Message-ID: <32b967ce-bb76-45ad-8660-c1d96a35fc72@g11g2000yqe.googlegroups.com>

On Mar 25, 10:39?pm, Winston <winst... at stratolab.com> wrote:
> Here's my proposal again, but hopefully with better formatting so you
> can read it easier.
>
> -Winston
> -----------------
>
> Proposal for a new Generator Syntax in Python 3K--
> A Baton object for generators to allow subfunction to yield, and to
> make
> them symetric.

isn't a Baton what CSP calls a channel ?

there is this interesting PyCSP library (which implements channels
over greenlets, os-processes (via multiprocessing) or python threads)
http://code.google.com/p/pycsp

cheers,
sebastien.


From gnarlodious at gmail.com  Fri Mar 26 10:30:47 2010
From: gnarlodious at gmail.com (Gnarlodious)
Date: Fri, 26 Mar 2010 07:30:47 -0700 (PDT)
Subject: Have you embraced Python 3.x yet?
References: <hoicgd$23v0$1@news.telesweet.net>
Message-ID: <ea916e02-ff4a-4251-9569-165a5bfef989@u15g2000prd.googlegroups.com>

I have been using Py3 since October, I switched over for the
OrderedDict feature. Some parts are a little hard to get used to, but
others are easier. I am doing web programming, so the UTF 8 default is
a  big improvement.

-- Gnarlie


From showell30 at yahoo.com  Fri Mar 26 10:31:17 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Fri, 26 Mar 2010 07:31:17 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
Message-ID: <1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>

On Mar 24, 4:19?pm, Paul Rubin <no.em... at nospam.invalid> wrote:
> kj <no.em... at please.post> writes:
> > Is there a sequence-oriented equivalent to the sum built-in? ?E.g.:
> > ? seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)
>
> use itertools.chain for this. ?A few people have mentioned that sum will
> also work, but I think for that purpose it could have O(n**2)
> complexity.

I agree on the practical matter that itertools.chain and other
solutions are usually the way to go for most tasks that involve
iterating through several lists.

>From a purely academic standpoint, I'm not convinced that sum() is
inefficient in terms of big-O complexity, though.

 showell at showell-laptop:~$ python
 Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
 [GCC 4.3.3] on linux2
 >>> class StupidList:
 ...   def __init__(self, lst):
 ...     print 'creating', lst
 ...     self.lst = lst
 ...   def __add__(self, other):
 ...     self.lst += '|'
 ...     self.lst.extend(other.lst)
 ...     return self
 ...
 >>> result = sum([StupidList([1, 2]), StupidList([3,4]),
StupidList([5,6])], StupidList([0]))
 creating [1, 2]
 creating [3, 4]
 creating [5, 6]
 creating [0]
 >>> result.lst
 [0, '|', 1, 2, '|', 3, 4, '|', 5, 6]

If I'm interpreting the above program correctly, then sum() is doing
the most efficient thing under the hood--it appears to do the
equivalent of += without creating unnecessary objects for intermediate
sums.

I think the special-case error message might be a case where
practicality simply beats out purity.  It would be nice if sum() were
completely duck-typed-let-you-shoot-yourself-in-foot-if-you-know-what-
you-are-doing, but maybe this was such a pitfall at one time, that
extra safeguards were put into sum().  I wonder how severely sum(),
without the restriction, would underperform join() on modern versions
of Python, though.

 >>> sum('1', '2')
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
 TypeError: sum() can't sum strings [use ''.join(seq) instead]

Note that you can easily fake out sum() to get duck typing.

 >>> class EmptyStringStarter:
 ...   def __add__(self, other): return other
 ...
 >>> empty = EmptyStringStarter()
 >>> sum(['hello ', 'world'], empty)
 'hello world'



From no.email at please.post  Fri Mar 26 10:49:02 2010
From: no.email at please.post (kj)
Date: Fri, 26 Mar 2010 14:49:02 +0000 (UTC)
Subject: Classes as namespaces?
Message-ID: <hoihgt$p6t$1@reader1.panix.com>



What's the word on using "classes as namespaces"?  E.g.

class _cfg(object):
    spam = 1
    jambon = 3 
    huevos = 2

breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)


Granted, this is not the "intended use" for classes, and therefore
could be viewed as a misuse ("that's what dictionaries are for",
etc.).  But other than this somewhat academic objection[*], I really
can see no problem with using classes in this way.

And yet, I've come across online murky warnings against using
classes as "pseudo-namespaces".  Is there some problem that I'm
not seeing with this technique?

~K

[*] My own subjective dislike for the widespread practice of using
triple quotes to comment out code is formally similar to this one
("the 'intended use' for triple-quoting is not to comment out code",
etc.).  Here I find myself on the opposite side of the purist/pragmatic
divide.  Hmmm.


From showell30 at yahoo.com  Fri Mar 26 10:56:48 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Fri, 26 Mar 2010 07:56:48 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
Message-ID: <fc010d65-838b-436c-b038-8e9c0d8ccc53@h35g2000pri.googlegroups.com>

On Mar 26, 7:31?am, Steve Howell <showel... at yahoo.com> wrote:
> On Mar 24, 4:19?pm, Paul Rubin <no.em... at nospam.invalid> wrote:
>
> > kj <no.em... at please.post> writes:
> > > Is there a sequence-oriented equivalent to the sum built-in? ?E.g.:
> > > ? seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)
>
> > use itertools.chain for this. ?A few people have mentioned that sum will
> > also work, but I think for that purpose it could have O(n**2)
> > complexity.
>
> I agree on the practical matter that itertools.chain and other
> solutions are usually the way to go for most tasks that involve
> iterating through several lists.
>
> From a purely academic standpoint, I'm not convinced that sum() is
> inefficient in terms of big-O complexity, though.
>
> ?showell at showell-laptop:~$ python
> ?Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
> ?[GCC 4.3.3] on linux2
> ?>>> class StupidList:
> ?... ? def __init__(self, lst):
> ?... ? ? print 'creating', lst
> ?... ? ? self.lst = lst
> ?... ? def __add__(self, other):
> ?... ? ? self.lst += '|'
> ?... ? ? self.lst.extend(other.lst)
> ?... ? ? return self
> ?...
> ?>>> result = sum([StupidList([1, 2]), StupidList([3,4]),
> StupidList([5,6])], StupidList([0]))
> ?creating [1, 2]
> ?creating [3, 4]
> ?creating [5, 6]
> ?creating [0]
> ?>>> result.lst
> ?[0, '|', 1, 2, '|', 3, 4, '|', 5, 6]
>
> If I'm interpreting the above program correctly, then sum() is doing
> the most efficient thing under the hood--it appears to do the
> equivalent of += without creating unnecessary objects for intermediate
> sums.
>
> I think the special-case error message might be a case where
> practicality simply beats out purity. ?It would be nice if sum() were
> completely duck-typed-let-you-shoot-yourself-in-foot-if-you-know-what-
> you-are-doing, but maybe this was such a pitfall at one time, that
> extra safeguards were put into sum(). ?I wonder how severely sum(),
> without the restriction, would underperform join() on modern versions
> of Python, though.
>
> ?>>> sum('1', '2')
> ?Traceback (most recent call last):
> ? ?File "<stdin>", line 1, in <module>
> ?TypeError: sum() can't sum strings [use ''.join(seq) instead]
>
> Note that you can easily fake out sum() to get duck typing.
>
> ?>>> class EmptyStringStarter:
> ?... ? def __add__(self, other): return other
> ?...
> ?>>> empty = EmptyStringStarter()
> ?>>> sum(['hello ', 'world'], empty)
> ?'hello world'

Looking at the code answers my own questions:

http://svn.python.org/view/python/trunk/Python/bltinmodule.c?view=markup

Look for builtin_sum().

First you see the guard against strings:

 /* reject string values for 'start' parameter */
 if (PyObject_TypeCheck(result, &PyBaseString_Type)) {
	PyErr_SetString(PyExc_TypeError,
		"sum() can't sum strings [use ''.join(seq) instead]");
	Py_DECREF(iter);
	return NULL;
 }
 Py_INCREF(result);


Also, Paul's suspicion that sum() works in O(N squared) for lists is
confirmed by this comment:

  /* It's tempting to use PyNumber_InPlaceAdd instead of
   PyNumber_Add here, to avoid quadratic running time
   when doing 'sum(list_of_lists, [])'.  However, this
   would produce a change in behaviour: a snippet like
     empty = []
     sum([[x] for x in range(10)], empty)
   would change the value of empty. */

It's interesting, though, that you can construct classes pretty
easily, as I did above, that avoid the quadratic behavior, as long as
you do not mind mutating the start value, which I think is usually
fine, since the original start value usually is not useful afterward
anyway.




From robert.kern at gmail.com  Fri Mar 26 10:56:52 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 26 Mar 2010 09:56:52 -0500
Subject: OT: Meaning of "monkey"
In-Reply-To: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
Message-ID: <hoihvp$80i$1@dough.gmane.org>

On 2010-03-26 08:14 AM, Luis M. Gonz?lez wrote:
> Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
> Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
>
> Monkeys everywhere.
> Sorry for the off topic question, but what does "monkey" mean in a
> nerdy-geek context??

Partly because "monkey" is just a funny word.

As for monkey-patching, it came from the Zope community:

   http://en.wikipedia.org/wiki/Monkey_patching

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From joncle at googlemail.com  Fri Mar 26 10:58:52 2010
From: joncle at googlemail.com (Jon Clements)
Date: Fri, 26 Mar 2010 07:58:52 -0700 (PDT)
Subject: Python database of plain text editable by notepad or vi
References: <93d7991f-d688-4692-b34f-2fa571cebbdf@q15g2000yqj.googlegroups.com>
	<46822448-2984-4ef6-85c7-bef834e2e86c@r1g2000yqj.googlegroups.com> 
	<3d897b92-9def-4339-ac19-b06b5fb9705e@e6g2000yqh.googlegroups.com>
Message-ID: <a62686e9-5b8e-4c24-a092-b95554b9536e@30g2000yqi.googlegroups.com>

On 26 Mar, 09:49, James Harris <james.harri... at googlemail.com> wrote:
> On 25 Mar, 22:56, Jon Clements <jon... at googlemail.com> wrote:
>
>
>
> > On 25 Mar, 22:40, James Harris <james.harri... at googlemail.com> wrote:
>
> > > I am looking to store named pieces of text in a form that can be
> > > edited by a standard editor such as notepad (under Windows) or vi
> > > (under Unix) and then pulled into Python as needed. The usual record
> > > locking and transactions of databases are not required.
>
> > > Another way to look at it is to treat the separate files as entries in
> > > a dictionary. The file name would be the key and the lines of the file
> > > the value.
>
> > > Anyone know of a database (with a Python interface) which will allow
> > > text files to be treated as database fields? If not I can just write
> > > it but I thought it best to ask if there was an existing solution
> > > first.
> ...
> > I could be missing something here, but aren't you basically just
> > talking about an OS's filesystem?
>
> For storage, yes. The files would be marked-up text stored in the
> filesystem. The "dbms" (I use the term loosely!) would provide access
> to them by some full or partial key mechanism yet to be determined.
> Read-only access would do - at least for now.
>
> > glob or listdir somewhere, then create a dict using the file contents
> > would meet your criteria, with very little lines of code -- but I
> > would be interested to know what the use-case was for this... Is it
> > read completely at start up time, or if each file contains a large
> > amount of lines and aren't fixed width (or has no other indexing
> > support without maintenance), then is a complete sequential-scan
> > required each time, or do you just tell the user to not update when
> > running (unless I s'pose something along the lines of a SIGHUP for
> > config files is applicable).
>
> All good questions. For now, at least, the files can be read-only and
> I'd want those on disk to be the master copies at all times. If I was
> writing it myself I'd probably 'cache' some files in memory and stat
> them before use. If newer I would reread the file.
>

It's hard to bore this group :)

>
>
> > Sorry, just don't understand why you'd want this.
>
> I tried to avoid boring folks with the details. I'm toying with some
> ideas for a way to help generate source code (in various languages,
> not just Python). If it goes ahead the text files would be mainly
> marked-up code snippets - with or without symbols that need to be
> replaced.
>
> Rather than write one single monolithic app I thought to split it into
> reusable components. One part being data access could perhaps be an
> existing database (and I'll take a look at jkn's suggestion).
>
> Think of the database as similar to an associative array stored on
> disk. The only difference is I may want to play fast and loose with
> the keys in some ways - e.g. check for partial key matches or return a
> list of part-matched keys. The language name could be part of the key
> but I'd also need to store variants for specific language versions.
> I'm not sure yet how it will all pan out. As I say, just throwing
> around some ideas.
>
> James

Thanks for the explanation.

Who admins and, who's editing this data?

I couldn't 100% guarantee that I could modify a text file and always
put the right
delimiter in the right place and remember to escape the relevant chars
(and I'm
probably not the 'average' user).

Any opposition to just putting it in a 'proper' DB, then 'blobbing'
the values?
(or just integrate a procedure/script/function whatever your chosen
RDBMS calls to choose it).
Or in some systems, 'externally referencing'... loads of DB's have
free front-ends,
and there are lots of Python libraries.

I think perhaps, all I'm saying is, I'd choose a different approach.
I'd provide a front-end, rather than choose to re-write the wheel over
DB's.

Be nice to know how you get on, if you'd be so kind?

Cheers,

Jon.




From michel.metzger at gmail.com  Fri Mar 26 11:00:57 2010
From: michel.metzger at gmail.com (Michel)
Date: Fri, 26 Mar 2010 08:00:57 -0700 (PDT)
Subject: Create a class at run-time
References: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>
	<mailman.1196.1269555498.23598.python-list@python.org>
Message-ID: <3479ec6a-fe04-4088-83e9-e3ef60a8152e@k4g2000prh.googlegroups.com>

Well, I don't have the reference to the instance. The class is
actually instantiated later by a the unittest library.

On Mar 25, 6:18?pm, Michiel Overtoom <mot... at xs4all.nl> wrote:
> On 2010-03-25 23:00, Michel wrote:
>
> > I'm trying to dynamically create a class. What I need is to define a
> > class, add methods to it and later instantiate this class. Methods
> > need to be bound to the instance though, and that's my problem.
>
> Maybe this snippet is of any help?
>
> import functools
>
> class Template(object):
> ? ? ?pass
>
> def printmyname(self):
> ? ? ?print self.name
>
> t=Template()
> t.name="Pete"
> t.printmyname=functools.partial(printmyname,t)
>
> u=Template()
> u.name="Mary"
> u.printmyname=functools.partial(printmyname,u)
>
> t.printmyname()
> u.printmyname()
>
> Greetings,
>
> --
> "The ability of the OSS process to collect and harness
> the collective IQ of thousands of individuals across
> the Internet is simply amazing." - Vinod Valloppillilhttp://www.catb.org/~esr/halloween/halloween4.html



From v.harishankar at gmail.com  Fri Mar 26 11:04:13 2010
From: v.harishankar at gmail.com (Harishankar)
Date: Fri, 26 Mar 2010 15:04:13 +0000 (UTC)
Subject: Classes as namespaces?
References: <hoihgt$p6t$1@reader1.panix.com>
Message-ID: <hoiidc$2ao8$1@news.telesweet.net>

On Fri, 26 Mar 2010 14:49:02 +0000, kj wrote:

> What's the word on using "classes as namespaces"?  E.g.
> 
> class _cfg(object):
>     spam = 1
>     jambon = 3
>     huevos = 2
> 
> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
> 
> 
> Granted, this is not the "intended use" for classes, and therefore could
> be viewed as a misuse ("that's what dictionaries are for", etc.).  But
> other than this somewhat academic objection[*], I really can see no
> problem with using classes in this way.
> 
> And yet, I've come across online murky warnings against using classes as
> "pseudo-namespaces".  Is there some problem that I'm not seeing with
> this technique?
> 
> ~K
> 
> [*] My own subjective dislike for the widespread practice of using
> triple quotes to comment out code is formally similar to this one ("the
> 'intended use' for triple-quoting is not to comment out code", etc.). 
> Here I find myself on the opposite side of the purist/pragmatic divide. 
> Hmmm.

I myself am a humble beginner in many ways, but generally isn't that 
(namespacing) achieved by using modules?

I don't find the need generally to assign namespace to local variables 
and when there is a need for it, module level objects do the job.


From philip at semanchuk.com  Fri Mar 26 11:08:35 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Fri, 26 Mar 2010 11:08:35 -0400
Subject: Classes as namespaces?
In-Reply-To: <hoihgt$p6t$1@reader1.panix.com>
References: <hoihgt$p6t$1@reader1.panix.com>
Message-ID: <8651EEFD-64CC-4488-B981-F247C4F75BA6@semanchuk.com>


On Mar 26, 2010, at 10:49 AM, kj wrote:

>
>
> What's the word on using "classes as namespaces"?  E.g.
>
> class _cfg(object):
>    spam = 1
>    jambon = 3
>    huevos = 2
>
> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
>
>
> Granted, this is not the "intended use" for classes, and therefore
> could be viewed as a misuse ("that's what dictionaries are for",
> etc.).  But other than this somewhat academic objection[*], I really
> can see no problem with using classes in this way.
>
> And yet, I've come across online murky warnings against using
> classes as "pseudo-namespaces".  Is there some problem that I'm
> not seeing with this technique?

I hope it's not problematic; I use it all the time.

A few differences about the way I do it:
- I respect PEP 8 for the class name (CamelCaps)
- If the attributes are supposed to be constants, I capitalize the  
attributes
- I often add NONE with a value of zero so that bool(MyClass.NONE)  
will evaluate to False and everything else will be True

Here's an example from my code:

class Apodization(object):
     """ Apodization constants """
     # These constants are arbitrary and may change.
     # However bool(NONE) is guaranteed to be False
     NONE = 0
     GAUSSIAN = 1
     LORENTZIAN = 2



Cheers
Philip



From jeanmichel at sequans.com  Fri Mar 26 11:44:39 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 26 Mar 2010 16:44:39 +0100
Subject: python logging writes an empty file
In-Reply-To: <804cd4021003260729t150ffdd3m1f30fc1bdea138ca@mail.gmail.com>
References: <804cd4021003251711p5c1ec832pf2b98da8f19bef1e@mail.gmail.com>	
	<4BACBC56.1020105@sequans.com>
	<804cd4021003260729t150ffdd3m1f30fc1bdea138ca@mail.gmail.com>
Message-ID: <4BACD667.7020803@sequans.com>

Ovidiu Deac wrote:
>> You set le level of your handler, but did not set the level of the logger
>> itself.
>> Replace file.setLevel(logging.INFO) by
>> logging.getLogger().setLevel(logging.INFO)
>>
>> Log events are matched versus the logger level 1st, then the handler level
>> (if applicable). Most of the time you don't need to tune your handler
>> levels.
>>     
>
> Right. Thanks a lot!!!
>
> Now for the second part, any idea why logging.config.fileConfig doesn't work?
>
> Now the logging.conf looks like this:
>
> [formatters]
> keys: detailed
>
> [handlers]
> keys: console,file
>
> [loggers]
> keys: root
>
> [formatter_detailed]
> format: %(name)s:%(levelname)s %(module)s:%(lineno)d:  %(message)s
>
> [handler_console]
> class: StreamHandler
> args: []
> formatter: detailed
>
> [handler_file]
> class=FileHandler
> formatter=detailed
> args=('output.log', 'w')
> filename=output.log
> mode=w
>
> [logger_root]
> level: INFO
> handlers: file
>   
I'm not sure, I don't use configuration file my loggers.

I don't think the handler_file should have a filename or mode field 
though. Try removing them.

JM


From invalid at invalid.invalid  Fri Mar 26 11:45:18 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Fri, 26 Mar 2010 15:45:18 +0000 (UTC)
Subject: OT: Meaning of "monkey"
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
Message-ID: <hoikqe$qcu$1@reader1.panix.com>

On 2010-03-26, Luis M  Gonz?lez <luismgz at gmail.com> wrote:
> Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
> Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
>
> Monkeys everywhere.
> Sorry for the off topic question, but what does "monkey" mean in a
> nerdy-geek context??

In colloquial English, "<something>-monkey" is a slang term for a
person who does a particular job for a living.  For example "grease
monkey" is a slang term for an auto mechanic.  A "code monkey" is
somebody who writes code for a living.

It can be slightly derogitory in some situations since it implies that
the task is mechanical and repetitive and doesn't require a lot of
creative thinking.

However, it can be used among peers in an affectionate way.  One may
refer to one's peer as "code monkey" without offense, but a manager
could not refer to one of his employees as a "code monkey" without
risking it being seen as an insult.

Many people are accustomed to speaking anthopomorphically about
computers and programs, so when somebody writes a program that does
"foo", the name "foo monkey" seems natural for that program.

-- 
Grant Edwards               grant.b.edwards        Yow! I don't know WHY I
                                  at               said that ... I think it
                              gmail.com            came from the FILLINGS in
                                                   my rear molars ...


From joncle at googlemail.com  Fri Mar 26 11:47:29 2010
From: joncle at googlemail.com (Jon Clements)
Date: Fri, 26 Mar 2010 08:47:29 -0700 (PDT)
Subject: Classes as namespaces?
References: <hoihgt$p6t$1@reader1.panix.com>
Message-ID: <809a6515-214f-4460-a847-0e935c7f87b9@t23g2000yqt.googlegroups.com>

On 26 Mar, 14:49, kj <no.em... at please.post> wrote:
> What's the word on using "classes as namespaces"? ?E.g.
>
> class _cfg(object):
> ? ? spam = 1
> ? ? jambon = 3
> ? ? huevos = 2
>
> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
>
> Granted, this is not the "intended use" for classes, and therefore
> could be viewed as a misuse ("that's what dictionaries are for",
> etc.). ?But other than this somewhat academic objection[*], I really
> can see no problem with using classes in this way.
>
> And yet, I've come across online murky warnings against using
> classes as "pseudo-namespaces". ?Is there some problem that I'm
> not seeing with this technique?
>
> ~K
>
> [*] My own subjective dislike for the widespread practice of using
> triple quotes to comment out code is formally similar to this one
> ("the 'intended use' for triple-quoting is not to comment out code",
> etc.). ?Here I find myself on the opposite side of the purist/pragmatic
> divide. ?Hmmm.

Given this example, I would go for the module and CONSTANT_NAMING
approach.

But yes, even in the docs. you can use a class as a C type-of struct.

I stick to the convention of a class knows what it's doing,
what it's doing it on, and a module just happens to contain those
classes.

C++ std::algorithm for instance,
makes sense it's called std, ditto algorithm and has shed loads in it,
but would I create a class called algorithm (unlikely).

I would tend to view modules as "namespace". Rightly or wrongly, just
lets you make the right design choice.

Jon.





From jackdied at gmail.com  Fri Mar 26 11:49:14 2010
From: jackdied at gmail.com (Jack Diederich)
Date: Fri, 26 Mar 2010 11:49:14 -0400
Subject: Classes as namespaces?
In-Reply-To: <hoihgt$p6t$1@reader1.panix.com>
References: <hoihgt$p6t$1@reader1.panix.com>
Message-ID: <b8e622741003260849m35c3aaa3le3b65e0e4b45d07c@mail.gmail.com>

On Fri, Mar 26, 2010 at 10:49 AM, kj <no.email at please.post> wrote:
>
>
> What's the word on using "classes as namespaces"? ?E.g.
>
> class _cfg(object):
> ? ?spam = 1
> ? ?jambon = 3
> ? ?huevos = 2
>
> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)

Classes as namespaces are a valid use case (I do it all the time).
Python 3 has a small cleanup that makes classes even closer to module
namespaces;  namely the concept of "unbound methods" goes away.  In
3.x when you get a function from a class you get the function itself
and not an unbound function.

-Jack


From jeanmichel at sequans.com  Fri Mar 26 11:50:31 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 26 Mar 2010 16:50:31 +0100
Subject: Classes as namespaces?
In-Reply-To: <hoihgt$p6t$1@reader1.panix.com>
References: <hoihgt$p6t$1@reader1.panix.com>
Message-ID: <4BACD7C7.1060006@sequans.com>

kj wrote:
> What's the word on using "classes as namespaces"?  E.g.
>
> class _cfg(object):
>     spam = 1
>     jambon = 3 
>     huevos = 2
>
> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
>
>
> Granted, this is not the "intended use" for classes, and therefore
> could be viewed as a misuse ("that's what dictionaries are for",
> etc.).  But other than this somewhat academic objection[*], I really
> can see no problem with using classes in this way.
>   
You cannot see the problem because there's no problem using classes as 
namespaces.
> And yet, I've come across online murky warnings against using
> classes as "pseudo-namespaces".  Is there some problem that I'm
> not seeing with this technique?
>
> ~K
>   
import this
[snip]
Namespaces are one honking great idea -- let's do more of those!

Modules and dictionaries are no more namespaces than classes. So any 
container is potentially a namespace.

JM


From michel.metzger at gmail.com  Fri Mar 26 11:54:11 2010
From: michel.metzger at gmail.com (Michel)
Date: Fri, 26 Mar 2010 08:54:11 -0700 (PDT)
Subject: Create a class at run-time
References: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>
	<4bac1380$1@news.x-privat.org>
Message-ID: <f0fccd34-1abf-4221-9fbb-922082a24f89@t34g2000prm.googlegroups.com>

I want to add a method to a class such that it can be invoked on
specifics instances.
You solution works (as well as Patrick's one), thanks !
I still have a question though. If I print the type of the self object
I get when my method is
called, I get "<class 'test.TestClass'>". I guess this is because the
method is defined as a class method.
This is ok in my case, but just out of curiosity, what should I do to
change this method to an instance method?

Thanks for your help,

Michel.

On Mar 25, 9:53?pm, I V <ivle... at gmail.com> wrote:
> On Thu, 25 Mar 2010 15:00:35 -0700, Michel wrote:
> > I'm trying to dynamically create a class. What I need is to define a
> > class, add methods to it and later instantiate this class. Methods need
> > to be bound to the instance though, and that's my problem. Here is what
> > I have so far:
>
> I'm not entirely sure what you mean by binding methods to the instance.
> Do you mean you need to dynamically add methods to a specific instance?
> Or that you need to add methods to a class, such that they can be invoked
> on specific instances? For the latter, just do:
>
> TestClass.test_foo = test_foo
>
> For the former, try:
>
> tc = TestClass()
> tc.test_foo = types.MethodType(test_foo, tc)



From robert.kern at gmail.com  Fri Mar 26 12:06:19 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 26 Mar 2010 11:06:19 -0500
Subject: OT: Meaning of "monkey"
In-Reply-To: <hoikqe$qcu$1@reader1.panix.com>
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
	<hoikqe$qcu$1@reader1.panix.com>
Message-ID: <hoim1r$p7u$1@dough.gmane.org>

On 2010-03-26 10:45 AM, Grant Edwards wrote:
> On 2010-03-26, Luis M  Gonz?lez<luismgz at gmail.com>  wrote:
>> Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
>> Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
>>
>> Monkeys everywhere.

> Many people are accustomed to speaking anthopomorphically about

"simiomorphically"?

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From mwilson at the-wire.com  Fri Mar 26 12:08:41 2010
From: mwilson at the-wire.com (Mel)
Date: Fri, 26 Mar 2010 12:08:41 -0400
Subject: OT: Meaning of "monkey"
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
	<hoikqe$qcu$1@reader1.panix.com>
Message-ID: <hoim3t$bol$1@speranza.aioe.org>

Grant Edwards wrote:
> However, it can be used among peers in an affectionate way.  One may
> refer to one's peer as "code monkey" without offense, but a manager
> could not refer to one of his employees as a "code monkey" without
> risking it being seen as an insult.

Somewhere on the Internet there's a particularly brilliant pop song called 
"Code Monkey".

	Mel.




From joncle at googlemail.com  Fri Mar 26 12:14:35 2010
From: joncle at googlemail.com (Jon Clements)
Date: Fri, 26 Mar 2010 09:14:35 -0700 (PDT)
Subject: OT: Meaning of "monkey"
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
	<hoikqe$qcu$1@reader1.panix.com>
Message-ID: <af6b9df5-d5cb-4ce6-8d29-1f304d9c5858@g11g2000yqe.googlegroups.com>

On 26 Mar, 15:45, Grant Edwards <inva... at invalid.invalid> wrote:
> On 2010-03-26, Luis M ?Gonz?lez <luis... at gmail.com> wrote:
>
> > Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
> > Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
>
> > Monkeys everywhere.
> > Sorry for the off topic question, but what does "monkey" mean in a
> > nerdy-geek context??
>
> In colloquial English, "<something>-monkey" is a slang term for a
> person who does a particular job for a living. ?For example "grease
> monkey" is a slang term for an auto mechanic. ?A "code monkey" is
> somebody who writes code for a living.
>
> It can be slightly derogitory in some situations since it implies that
> the task is mechanical and repetitive and doesn't require a lot of
> creative thinking.
>
> However, it can be used among peers in an affectionate way. ?One may
> refer to one's peer as "code monkey" without offense, but a manager
> could not refer to one of his employees as a "code monkey" without
> risking it being seen as an insult.
>
> Many people are accustomed to speaking anthopomorphically about
> computers and programs, so when somebody writes a program that does
> "foo", the name "foo monkey" seems natural for that program.
>
> --
> Grant Edwards ? ? ? ? ? ? ? grant.b.edwards ? ? ? ?Yow! I don't know WHY I
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? at ? ? ? ? ? ? ? said that ... I think it
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? gmail.com ? ? ? ? ? ?came from the FILLINGS in
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?my rear molars ...

Can I take the slight risk that actually it can also be (as you said
'affectionately') in a very positive sense. The same way "geek" or
"nerd" can be applied. I used to be called "Big Geek" from the last
company I worked for on PAYE, but that was a compliment. But, I've
heard my step-dad call someone a "Geek" which is derogatory.

No winning when you have language that can mean "bad" (in meaning
"wicked/very good/awesome" (and even 'wicked' means good sometimes -
as in enthusiasm for an idea)) or actually "bad/not good [add your own
synonyms]". All valid, but which is good/bad :)

Anyway, this' a group for Python, not English :)

Feel better for my rant :)


Jon.





From ovidiudeac at gmail.com  Fri Mar 26 12:26:20 2010
From: ovidiudeac at gmail.com (Ovidiu Deac)
Date: Fri, 26 Mar 2010 18:26:20 +0200
Subject: python logging writes an empty file
In-Reply-To: <4BACD667.7020803@sequans.com>
References: <804cd4021003251711p5c1ec832pf2b98da8f19bef1e@mail.gmail.com>
	<4BACBC56.1020105@sequans.com>
	<804cd4021003260729t150ffdd3m1f30fc1bdea138ca@mail.gmail.com>
	<4BACD667.7020803@sequans.com>
Message-ID: <804cd4021003260926y6610e90flb433737dc9a99e4a@mail.gmail.com>

Anyway, thanks for the first part.

Anybody else has any idea why using the same configuration file works
when running the tests with nosetests and doesn't work with
logging.config.fileConfig() ?


From tim.wintle at teamrubber.com  Fri Mar 26 12:54:30 2010
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Fri, 26 Mar 2010 16:54:30 +0000
Subject: OT: Meaning of "monkey"
In-Reply-To: <hoim3t$bol$1@speranza.aioe.org>
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
	<hoikqe$qcu$1@reader1.panix.com>  <hoim3t$bol$1@speranza.aioe.org>
Message-ID: <1269622470.29388.1.camel@localhost>

On Fri, 2010-03-26 at 12:08 -0400, Mel wrote:
> Somewhere on the Internet there's a particularly brilliant pop song
> called "Code Monkey".

http://www.jonathancoulton.com/2006/04/14/thing-a-week-29-code-monkey/

(he's linked to the mp3 from there)



From __peter__ at web.de  Fri Mar 26 13:29:23 2010
From: __peter__ at web.de (Peter Otten)
Date: Fri, 26 Mar 2010 18:29:23 +0100
Subject: Create a class at run-time
References: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>
Message-ID: <hoiqsm$gd6$1@dough.gmane.org>

Michel wrote:

> Hi everyone,
> 
> I'm trying to dynamically create a class. What I need is to define a
> class, add methods to it and later instantiate this class. Methods
> need to be bound to the instance though, and that's my problem. Here
> is what I have so far:
> 
> method_template = "def test_foo(self):\
>     #actual test_foo\
>     pass"
> exec method_template
> 
> TestClass = types.ClassType("MyTestClass", (unittest.TestCase, ), {})
> TestClass.__module__ = "test"
> 
> now what to do next?

Just assign it:

>>> import unittest
>>> class MyTestClass(unittest.TestCase): pass
...
>>> def test_foo(self):
...     self.assertEquals(1, 2)
...
>>> MyTestClass.test_foo = test_foo # <----
>>> unittest.main()
F
======================================================================
FAIL: test_foo (__main__.MyTestClass)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "<stdin>", line 2, in test_foo
AssertionError: 1 != 2

----------------------------------------------------------------------
Ran 1 test in 0.000s

FAILED (failures=1)

If you don't know the method name beforehand use

setattr(MyTestClass, method_name, method), e. g:

>>> import unittest
>>> class MyTestClass(unittest.TestCase): pass
...                                           
>>> def make_method(n):
...     def test(self): self.assertEquals(2, n)
...     return test                            
...
>>> for i in range(3):
...     setattr(MyTestClass, "test_%d" % i, make_method(i))
...
>>> unittest.main()
FF.
======================================================================
FAIL: test_0 (__main__.MyTestClass)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "<stdin>", line 2, in test
AssertionError: 2 != 0

======================================================================
FAIL: test_1 (__main__.MyTestClass)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "<stdin>", line 2, in test
AssertionError: 2 != 1

----------------------------------------------------------------------
Ran 3 tests in 0.000s

FAILED (failures=2)

Peter



From sccolbert at gmail.com  Fri Mar 26 13:36:55 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Fri, 26 Mar 2010 13:36:55 -0400
Subject: Classes as namespaces?
In-Reply-To: <4BACD7C7.1060006@sequans.com>
References: <hoihgt$p6t$1@reader1.panix.com> <4BACD7C7.1060006@sequans.com>
Message-ID: <7f014ea61003261036t11f50d89k409b66f854d53ab1@mail.gmail.com>

i use them in Pymazon to encapsulate program wide settings and enforce valid
values for these settings.
http://code.google.com/p/pymazon/source/browse/pymazon/settings.py



On Fri, Mar 26, 2010 at 11:50 AM, Jean-Michel Pichavant <
jeanmichel at sequans.com> wrote:

> kj wrote:
>
>> What's the word on using "classes as namespaces"?  E.g.
>>
>> class _cfg(object):
>>    spam = 1
>>    jambon = 3     huevos = 2
>>
>> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
>>
>>
>> Granted, this is not the "intended use" for classes, and therefore
>> could be viewed as a misuse ("that's what dictionaries are for",
>> etc.).  But other than this somewhat academic objection[*], I really
>> can see no problem with using classes in this way.
>>
>>
> You cannot see the problem because there's no problem using classes as
> namespaces.
>
>  And yet, I've come across online murky warnings against using
>> classes as "pseudo-namespaces".  Is there some problem that I'm
>> not seeing with this technique?
>>
>> ~K
>>
>>
> import this
> [snip]
> Namespaces are one honking great idea -- let's do more of those!
>
> Modules and dictionaries are no more namespaces than classes. So any
> container is potentially a namespace.
>
> JM
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From nobody at nowhere.com  Fri Mar 26 13:38:58 2010
From: nobody at nowhere.com (Nobody)
Date: Fri, 26 Mar 2010 17:38:58 +0000
Subject: Have you embraced Python 3.x yet?
References: <hoicgd$23v0$1@news.telesweet.net>
Message-ID: <pan.2010.03.26.17.38.57.563000@nowhere.com>

On Fri, 26 Mar 2010 13:23:25 +0000, Harishankar wrote:

> Have you people embraced Python 3.x or still with 2.5 or 2.6? 

Still with 2.6, and probably will be indefinitely.

I use Python mostly for Unix scripting: the kind of task which would
traditionally have used Bourne shell. For that purpose, life is much
simpler when everything is byte strings rather than character strings.

If I was doing the same thing on Windows, Python 3.x would probably make
more sense, as all of the OS APIs use Unicode (although there's still a
hell of a lot of software written using the "ANSI" interfaces; my
AppLocale folder has over a hundred entries).



From no.email at please.post  Fri Mar 26 13:51:36 2010
From: no.email at please.post (kj)
Date: Fri, 26 Mar 2010 17:51:36 +0000 (UTC)
Subject: Classes as namespaces?
References: <hoihgt$p6t$1@reader1.panix.com>
	<mailman.1228.1269618641.23598.python-list@python.org>
Message-ID: <hois78$5m6$1@reader1.panix.com>




Thanks for all your comments.

I see that modules are arguably Python's standard way for implementing
namespaces.  I guess I tend to avoid modules primarily because of
lingering mental trauma over incidents of insane/bizarro import
bugs in the past.  (It's not rational, I know; it's like when one
develops an aversion for some previously liked food after a bout
of food poisoning with it.)  Now I postpone creating a new Python
module until the pain of not doing so forces me beyond my phobia.
(Yes, you got that right, I'm a basket case.)


From ownbusiness.ws at gmail.com  Fri Mar 26 14:04:18 2010
From: ownbusiness.ws at gmail.com (www.ownbusiness.ws)
Date: Fri, 26 Mar 2010 11:04:18 -0700 (PDT)
Subject: Income for life !
Message-ID: <eb7e7f17-ee65-4c18-9c85-2f9ab94f0f07@l25g2000yqd.googlegroups.com>

www.ownbusiness.ws

Change your life now.
Try, it really works.


From pavithra445 at gmail.com  Fri Mar 26 14:04:44 2010
From: pavithra445 at gmail.com (PAVITHRA)
Date: Fri, 26 Mar 2010 11:04:44 -0700 (PDT)
Subject: EARN MONEY IN FREE TIME(DO MORE & EARN MORE)
Message-ID: <f2bea4f5-51a3-4885-b77e-8e28e7012fef@m25g2000prj.googlegroups.com>

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http://nutritionhealthnoni.blogspot.com/
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From ownbusiness.ws at gmail.com  Fri Mar 26 14:05:12 2010
From: ownbusiness.ws at gmail.com (www.ownbusiness.ws)
Date: Fri, 26 Mar 2010 11:05:12 -0700 (PDT)
Subject: Income for life !
Message-ID: <5bd2ff92-4327-4699-a839-e280e0aa6225@j21g2000yqh.googlegroups.com>

www.ownbusiness.ws

Change your life now.
Try, it really works.


From philip at semanchuk.com  Fri Mar 26 14:10:59 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Fri, 26 Mar 2010 14:10:59 -0400
Subject: Classes as namespaces?
In-Reply-To: <hois78$5m6$1@reader1.panix.com>
References: <hoihgt$p6t$1@reader1.panix.com>
	<mailman.1228.1269618641.23598.python-list@python.org>
	<hois78$5m6$1@reader1.panix.com>
Message-ID: <4CA7EC42-05F4-46F2-A8B2-6BD8FE1CE17A@semanchuk.com>


On Mar 26, 2010, at 1:51 PM, kj wrote:

> Thanks for all your comments.
>
> I see that modules are arguably Python's standard way for implementing
> namespaces.  I guess I tend to avoid modules primarily because of
> lingering mental trauma over incidents of insane/bizarro import
> bugs in the past.

There can be good reasons (i.e. unrelated to trauma) not to use a one- 
namespace-per-module rule.

For instance, The app I'm working on now has 43 classes defined in a  
constants.py file. Each class is just a namespace for constants.  
That's much more practical than 43 modules called foo_constants.py,  
bar_constants.py, etc.

My Currency(type=CurrencyType.USD, value=decimal.Decimal(".02")),
Philip



From luismgz at gmail.com  Fri Mar 26 14:26:04 2010
From: luismgz at gmail.com (=?ISO-8859-1?Q?Luis_M=2E_Gonz=E1lez?=)
Date: Fri, 26 Mar 2010 11:26:04 -0700 (PDT)
Subject: Classes as namespaces?
References: <hoihgt$p6t$1@reader1.panix.com>
Message-ID: <69463be0-d839-43cf-a8a7-1cc9081f672d@r27g2000yqn.googlegroups.com>

On 26 mar, 11:49, kj <no.em... at please.post> wrote:
> What's the word on using "classes as namespaces"? ?E.g.
>
> class _cfg(object):
> ? ? spam = 1
> ? ? jambon = 3
> ? ? huevos = 2
>
> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)

I see no problem.
I wouldn't mix English, French and Spanish in the same recipe though...


From michel.metzger at gmail.com  Fri Mar 26 14:41:21 2010
From: michel.metzger at gmail.com (Michel)
Date: Fri, 26 Mar 2010 11:41:21 -0700 (PDT)
Subject: Create a class at run-time
References: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>
	<mailman.1232.1269624549.23598.python-list@python.org>
Message-ID: <4767a89e-d6a7-4c77-97f8-54d84e3e5bc8@u19g2000prh.googlegroups.com>

Thanks Peter.

I searched a little bit more and wrote the following example:

------------------------------------
import types

class MyClass:

    def test_toto(self):
        print type(self)
        print self.name

def test_toto(self):
    print type(self)
    print self.name

MyDynClass = types.ClassType("MyDynClass", (object, ), {})
MyDynClass.__module__ = "test.complex.hierarchy"
MyDynClass.test_toto = test_toto

t1 = MyDynClass()
t2 = MyDynClass()

t1.name = "Marcel"
t2.name = "Oscar"

t1.test_toto()
t2.test_toto()

c1 = MyClass()
c1.name = "Raoul"
c1.test_toto()
--------------------------------

the output is:

<class 'test.complex.hierarchy.MyDynClass'>
Marcel
<class 'test.complex.hierarchy.MyDynClass'>
Oscar
<type 'instance'>
Raoul

I'm wondering why the type of the self parameter is not 'instance' in
the calls
t1.test_toto() and t2.test_toto()

The rest of the behavior is correct though, so I guess it's just
internal Python stuff.

Thanks for your help,

Michel.

On Mar 26, 1:29?pm, Peter Otten <__pete... at web.de> wrote:
> Michel wrote:
> > Hi everyone,
>
> > I'm trying to dynamically create a class. What I need is to define a
> > class, add methods to it and later instantiate this class. Methods
> > need to be bound to the instance though, and that's my problem. Here
> > is what I have so far:
>
> > method_template = "def test_foo(self):\
> > ? ? #actual test_foo\
> > ? ? pass"
> > exec method_template
>
> > TestClass = types.ClassType("MyTestClass", (unittest.TestCase, ), {})
> > TestClass.__module__ = "test"
>
> > now what to do next?
>
> Just assign it:
>
> >>> import unittest
> >>> class MyTestClass(unittest.TestCase): pass
> ...
> >>> def test_foo(self):
>
> ... ? ? self.assertEquals(1, 2)
> ...>>> MyTestClass.test_foo = test_foo # <----
> >>> unittest.main()
>
> F
> ======================================================================
> FAIL: test_foo (__main__.MyTestClass)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
> ? File "<stdin>", line 2, in test_foo
> AssertionError: 1 != 2
>
> ----------------------------------------------------------------------
> Ran 1 test in 0.000s
>
> FAILED (failures=1)
>
> If you don't know the method name beforehand use
>
> setattr(MyTestClass, method_name, method), e. g:
>
> >>> import unittest
> >>> class MyTestClass(unittest.TestCase): pass
>
> ... ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?>>> def make_method(n):
>
> ... ? ? def test(self): self.assertEquals(2, n)
> ... ? ? return test ? ? ? ? ? ? ? ? ? ? ? ? ? ?
> ...>>> for i in range(3):
>
> ... ? ? setattr(MyTestClass, "test_%d" % i, make_method(i))
> ...>>> unittest.main()
>
> FF.
> ======================================================================
> FAIL: test_0 (__main__.MyTestClass)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
> ? File "<stdin>", line 2, in test
> AssertionError: 2 != 0
>
> ======================================================================
> FAIL: test_1 (__main__.MyTestClass)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
> ? File "<stdin>", line 2, in test
> AssertionError: 2 != 1
>
> ----------------------------------------------------------------------
> Ran 3 tests in 0.000s
>
> FAILED (failures=2)
>
> Peter



From vinay_sajip at yahoo.co.uk  Fri Mar 26 15:09:10 2010
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Fri, 26 Mar 2010 12:09:10 -0700 (PDT)
Subject: python logging writes an empty file
References: <804cd4021003251711p5c1ec832pf2b98da8f19bef1e@mail.gmail.com> 
	<4BACBC56.1020105@sequans.com>
	<804cd4021003260729t150ffdd3m1f30fc1bdea138ca@mail.gmail.com> 
	<4BACD667.7020803@sequans.com>
	<mailman.1230.1269620783.23598.python-list@python.org>
Message-ID: <12364311-5d80-4a14-a19b-f1e29aea9735@g19g2000yqe.googlegroups.com>

On Mar 26, 4:26?pm, Ovidiu Deac <ovidiud... at gmail.com> wrote:
> Anyway, thanks for the first part.
>
> Anybody else has any idea why using the same configuration file works
> when running the tests with nosetests and doesn't work withlogging.config.fileConfig() ?

It's probably because the fileConfig code is intended to *replace* any
existing configuration. This means disabling any existing loggers
which are not named explicitly, or not descendants of loggers named
explicitly, in the configuration.

Make sure you call logging.config.fileConfig() before any loggers have
been instantiated in your code, or else ensure that all the top-level
parents of those loggers (i.e. just below the root logger) are defined
in the configuration.

If you have version 2.6 or newer of Python, the fileConfig call has an
optional keyword parameter disable_existing_loggers which has a
default value of True, but which you can set to False to avoid
disabling the existing loggers.

Regards,

Vinay Sajip


From jonas at lophus.org  Fri Mar 26 15:10:24 2010
From: jonas at lophus.org (Jonas H.)
Date: Fri, 26 Mar 2010 20:10:24 +0100
Subject: [C-API] malloc error in PyDict_New
Message-ID: <4BAD06A0.3080206@lophus.org>

Hi there,

I'm currently diving into Python C programming and I have a problem with 
`PyDict_New`.

My application receives a SIGABRT from malloc every time I execute 
`PyDict_New`. malloc throws the following error:

     malloc.c:3096: sYSMALLOc: Assertion `(old_top == (((mbinptr) 
(((char *) &((av)->bins[((1) - 1) * 2])) [snip]' failed.

gdb gives me the following traceback:

     Program received signal SIGABRT, Aborted.
0x0012d422 in __kernel_vsyscall ()
(gdb) bt full
#0  0x0012d422 in __kernel_vsyscall ()
#5  0x003fef8c in malloc () from /lib/tls/i686/cmov/libc.so.6
#6  0x001b129c in new_arena (nbytes=3221223842) at ../Objects/obmalloc.c:534
         i = <value optimized out>
         numarenas = 16
         arenaobj = 0x0
         excess = 16
#7  PyObject_Malloc (nbytes=3221223842) at ../Objects/obmalloc.c:794
         bp = <value optimized out>
         pool = <value optimized out>
         next = <value optimized out>
         size = 4983326
#8  0x001baef5 in PyString_FromString (str=0x2964bf "<dummy key>") at 
../Objects/stringobject.c:138
         op = 0x0
#9  0x001a9d55 in PyDict_New () at ../Objects/dictobject.c:227
         mp = <value optimized out>
#10 0x08048fc0 in Transaction_new () at bjoern.c:32
         transaction = 0x80503a0
#11 0x08049309 in on_sock_accept (mainloop=0x13a120, 
accept_watcher=0xbffff770, revents=1) at bjoern.c:109
         [snip]
#12 0x00130594 in ev_invoke_pending () from /usr/lib/libev.so.3
#13 0x00135774 in ev_loop () from /usr/lib/libev.so.3
#14 0x080496e0 in main (argcount=1, args=0xbffff864) at bjoern.c:207
         [snip]


I have walked millions of Google pages but I couldn't find any 
explanation what causes the allocation error.  I tried to put the 
`PyDict_New` somewhere else to let it be invoked earlier/later. The only 
effect I got is a "memory corruption" reported by glibc.


Could anybody tell me what exactly I'm doing wrong? It is quite possible 
that I fscked up some pointers or memory ranges as this is my first C 
project.

You can find the whole source at github:
     http://github.com/jonashaag/bjoern

The call to `PyDict_New` is here:
     http://github.com/jonashaag/bjoern/blob/master/bjoern.c#L32


Thanks for your help!

     Jonas


From __peter__ at web.de  Fri Mar 26 15:16:28 2010
From: __peter__ at web.de (Peter Otten)
Date: Fri, 26 Mar 2010 20:16:28 +0100
Subject: Create a class at run-time
References: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>
	<mailman.1232.1269624549.23598.python-list@python.org>
	<4767a89e-d6a7-4c77-97f8-54d84e3e5bc8@u19g2000prh.googlegroups.com>
Message-ID: <hoj15d$df2$00$1@news.t-online.com>

Michel wrote:

> Thanks Peter.
> 
> I searched a little bit more and wrote the following example:
> 
> ------------------------------------
> import types
> 
> class MyClass:
> 
>     def test_toto(self):
>         print type(self)
>         print self.name
> 
> def test_toto(self):
>     print type(self)
>     print self.name
> 
> MyDynClass = types.ClassType("MyDynClass", (object, ), {})
> MyDynClass.__module__ = "test.complex.hierarchy"
> MyDynClass.test_toto = test_toto
> 
> t1 = MyDynClass()
> t2 = MyDynClass()
> 
> t1.name = "Marcel"
> t2.name = "Oscar"
> 
> t1.test_toto()
> t2.test_toto()
> 
> c1 = MyClass()
> c1.name = "Raoul"
> c1.test_toto()
> --------------------------------
> 
> the output is:
> 
> <class 'test.complex.hierarchy.MyDynClass'>
> Marcel
> <class 'test.complex.hierarchy.MyDynClass'>
> Oscar
> <type 'instance'>
> Raoul
> 
> I'm wondering why the type of the self parameter is not 'instance' in
> the calls
> t1.test_toto() and t2.test_toto()
> 
> The rest of the behavior is correct though, so I guess it's just
> internal Python stuff.

In Python 2.x there are "classic" and "newstyle" classes. In practice the 
main differences are that classic classes are more likely to call 
__getattr__() and that only newstyle classes support properties correctly.

By inheriting from object you make MyDynClass a newstyle class:

>>> classic = types.ClassType("A", (), {})
>>> newstyle = types.ClassType("A", (object,), {})

>>> type(classic()), type(classic)
(<type 'instance'>, <type 'classobj'>)

>>> type(newstyle()), type(newstyle)
(<class '__main__.A'>, <type 'type'>)

Classic classes exist for backwards compatibility and because most 
programmers are too lazy to have their classes inherit from object when the 
difference doesn't matter. When you create a class dynamically I recommend 
that you use the type() builtin instead of types.ClassType(). This will 
always create a newstyle class -- even when you don't inherit from object 
explicitly:

>>> type(type("A", (), {}))
<type 'type'>
>>> type("A", (), {}).__bases__
(<type 'object'>,)

Peter



From steve at holdenweb.com  Fri Mar 26 15:19:44 2010
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 26 Mar 2010 15:19:44 -0400
Subject: Create a class at run-time
In-Reply-To: <4767a89e-d6a7-4c77-97f8-54d84e3e5bc8@u19g2000prh.googlegroups.com>
References: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>	<mailman.1232.1269624549.23598.python-list@python.org>
	<4767a89e-d6a7-4c77-97f8-54d84e3e5bc8@u19g2000prh.googlegroups.com>
Message-ID: <hoj1cs$a5f$1@dough.gmane.org>

Michel wrote:
> Thanks Peter.
> 
> I searched a little bit more and wrote the following example:
> 
> ------------------------------------
> import types
> 
> class MyClass:
> 
>     def test_toto(self):
>         print type(self)
>         print self.name
> 
> def test_toto(self):
>     print type(self)
>     print self.name
> 
> MyDynClass = types.ClassType("MyDynClass", (object, ), {})
> MyDynClass.__module__ = "test.complex.hierarchy"
> MyDynClass.test_toto = test_toto
> 
> t1 = MyDynClass()
> t2 = MyDynClass()
> 
> t1.name = "Marcel"
> t2.name = "Oscar"
> 
> t1.test_toto()
> t2.test_toto()
> 
> c1 = MyClass()
> c1.name = "Raoul"
> c1.test_toto()
> --------------------------------
> 
> the output is:
> 
> <class 'test.complex.hierarchy.MyDynClass'>
> Marcel
> <class 'test.complex.hierarchy.MyDynClass'>
> Oscar
> <type 'instance'>
> Raoul
> 
> I'm wondering why the type of the self parameter is not 'instance' in
> the calls
> t1.test_toto() and t2.test_toto()
> 
> The rest of the behavior is correct though, so I guess it's just
> internal Python stuff.
> 
Yes, it's just that MyClass is an old-style class (its type is <type
'classobj'>) whereas MyDynClass is a new-style class (its type is <type
'type'>, because it inherits from object).

It's as though you had written

class MyClass:
   ...

class MyDynClass(object):
   ...

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From stefan_ml at behnel.de  Fri Mar 26 15:41:50 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 26 Mar 2010 20:41:50 +0100
Subject: [C-API] malloc error in PyDict_New
In-Reply-To: <4BAD06A0.3080206@lophus.org>
References: <4BAD06A0.3080206@lophus.org>
Message-ID: <hoj2lu$f53$1@dough.gmane.org>

Jonas H., 26.03.2010 20:10:
> I'm currently diving into Python C programming and I have a problem with
> `PyDict_New`.
>
> My application receives a SIGABRT from malloc every time I execute
> `PyDict_New`. malloc throws the following error:
>
> malloc.c:3096: sYSMALLOc: Assertion `(old_top == (((mbinptr) (((char *)
> &((av)->bins[((1) - 1) * 2])) [snip]' failed.

In case this code is not called from within Python but from some kind of 
network layer callback (maybe in a thread created by C code?), you will 
have to set up a Python interpreter environment for such a thread first. 
See the PyInterpreterState and PyThreadState functions here:

http://docs.python.org/c-api/init.html

Stefan



From phlip2005 at gmail.com  Fri Mar 26 15:44:04 2010
From: phlip2005 at gmail.com (Phlip)
Date: Fri, 26 Mar 2010 12:44:04 -0700 (PDT)
Subject: OT: Meaning of "monkey"
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
Message-ID: <6eca52f7-0a55-4c96-8144-9face3c88124@15g2000yqi.googlegroups.com>

On Mar 26, 6:14?am, Luis M. Gonz?lez <luis... at gmail.com> wrote:
> Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
> Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
>
> Monkeys everywhere.
> Sorry for the off topic question, but what does "monkey" mean in a
> nerdy-geek context??
>
> Luis

Better at typing than thinking.


From mensanator at aol.com  Fri Mar 26 16:07:34 2010
From: mensanator at aol.com (Mensanator)
Date: Fri, 26 Mar 2010 13:07:34 -0700 (PDT)
Subject: Have you embraced Python 3.x yet?
References: <hoicgd$23v0$1@news.telesweet.net>
Message-ID: <195c7315-85cc-412d-8ef5-f13314aecaae@33g2000yqj.googlegroups.com>

On Mar 26, 8:23?am, Harishankar <v.harishan... at gmail.com> wrote:
> Have you people embraced Python 3.x or still with 2.5 or 2.6?

3.1.

The only module I use regularly is gmpy and that's one that has
been updated.


From ovidiudeac at gmail.com  Fri Mar 26 16:08:14 2010
From: ovidiudeac at gmail.com (Ovidiu Deac)
Date: Fri, 26 Mar 2010 22:08:14 +0200
Subject: python logging writes an empty file
In-Reply-To: <12364311-5d80-4a14-a19b-f1e29aea9735@g19g2000yqe.googlegroups.com>
References: <804cd4021003251711p5c1ec832pf2b98da8f19bef1e@mail.gmail.com>
	<4BACBC56.1020105@sequans.com>
	<804cd4021003260729t150ffdd3m1f30fc1bdea138ca@mail.gmail.com>
	<4BACD667.7020803@sequans.com>
	<mailman.1230.1269620783.23598.python-list@python.org>
	<12364311-5d80-4a14-a19b-f1e29aea9735@g19g2000yqe.googlegroups.com>
Message-ID: <804cd4021003261308m5c5fc88cp35e0d1c43909aeb2@mail.gmail.com>

It worked. Setting disable_existing_loggers=False fixed my problem.

Thanks to both of you!
Ovidiu

On Fri, Mar 26, 2010 at 9:09 PM, Vinay Sajip <vinay_sajip at yahoo.co.uk> wrote:
> On Mar 26, 4:26?pm, Ovidiu Deac <ovidiud... at gmail.com> wrote:
>> Anyway, thanks for the first part.
>>
>> Anybody else has any idea why using the same configuration file works
>> when running the tests with nosetests and doesn't work withlogging.config.fileConfig() ?
>
> It's probably because the fileConfig code is intended to *replace* any
> existing configuration. This means disabling any existing loggers
> which are not named explicitly, or not descendants of loggers named
> explicitly, in the configuration.
>
> Make sure you call logging.config.fileConfig() before any loggers have
> been instantiated in your code, or else ensure that all the top-level
> parents of those loggers (i.e. just below the root logger) are defined
> in the configuration.
>
> If you have version 2.6 or newer of Python, the fileConfig call has an
> optional keyword parameter disable_existing_loggers which has a
> default value of True, but which you can set to False to avoid
> disabling the existing loggers.
>
> Regards,
>
> Vinay Sajip
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From mensanator at aol.com  Fri Mar 26 16:18:47 2010
From: mensanator at aol.com (Mensanator)
Date: Fri, 26 Mar 2010 13:18:47 -0700 (PDT)
Subject: OT: Meaning of "monkey"
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
	<6eca52f7-0a55-4c96-8144-9face3c88124@15g2000yqi.googlegroups.com>
Message-ID: <e684e6ae-be88-4d2b-8447-733f3a10d882@z11g2000yqz.googlegroups.com>

On Mar 26, 2:44?pm, Phlip <phlip2... at gmail.com> wrote:
> On Mar 26, 6:14?am, Luis M. Gonz?lez <luis... at gmail.com> wrote:
>
> > Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
> > Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
>
> > Monkeys everywhere.
> > Sorry for the off topic question, but what does "monkey" mean in a
> > nerdy-geek context??
>
> > Luis
>
> Better at typing than thinking.

Really? I thought it was more of a reference to Eddington, i.e., given
enough time even a monkey can type out a program.


From sccolbert at gmail.com  Fri Mar 26 16:26:44 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Fri, 26 Mar 2010 16:26:44 -0400
Subject: Have you embraced Python 3.x yet?
In-Reply-To: <195c7315-85cc-412d-8ef5-f13314aecaae@33g2000yqj.googlegroups.com>
References: <hoicgd$23v0$1@news.telesweet.net>
	<195c7315-85cc-412d-8ef5-f13314aecaae@33g2000yqj.googlegroups.com>
Message-ID: <7f014ea61003261326g3be655d8oefc1f710a6f7ae91@mail.gmail.com>

On Fri, Mar 26, 2010 at 4:07 PM, Mensanator <mensanator at aol.com> wrote:

> On Mar 26, 8:23 am, Harishankar <v.harishan... at gmail.com> wrote:
> > Have you people embraced Python 3.x or still with 2.5 or 2.6?
>
> 3.1.
>
> The only module I use regularly is gmpy and that's one that has
> been updated.
> --
> http://mail.python.org/mailman/listinfo/python-list
>

I won't switch until NumPy and SciPy make the jump.
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From ivlenin at gmail.com  Fri Mar 26 16:46:04 2010
From: ivlenin at gmail.com (I V)
Date: 26 Mar 2010 21:46:04 +0100
Subject: Create a class at run-time
References: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>
	<4bac1380$1@news.x-privat.org>
	<f0fccd34-1abf-4221-9fbb-922082a24f89@t34g2000prm.googlegroups.com>
Message-ID: <4bad1d0c$1@news.x-privat.org>

On Fri, 26 Mar 2010 08:54:11 -0700, Michel wrote:

> I want to add a method to a class such that it can be invoked on
> specifics instances.
> You solution works (as well as Patrick's one), thanks ! I still have a
> question though. If I print the type of the self object I get when my
> method is
> called, I get "<class 'test.TestClass'>". I guess this is because the
> method is defined as a class method.
> This is ok in my case, but just out of curiosity, what should I do to
> change this method to an instance method?

It already is an instance method. When you create a TestClass instance, 
the type of that instance is TestClass (the type of TestClass itself is 
"type").


From ricaraoz at gmail.com  Fri Mar 26 16:51:23 2010
From: ricaraoz at gmail.com (=?ISO-8859-1?Q?Ricardo_Ar=E1oz?=)
Date: Fri, 26 Mar 2010 17:51:23 -0300
Subject: Classes as namespaces?
In-Reply-To: <69463be0-d839-43cf-a8a7-1cc9081f672d@r27g2000yqn.googlegroups.com>
References: <hoihgt$p6t$1@reader1.panix.com>
	<69463be0-d839-43cf-a8a7-1cc9081f672d@r27g2000yqn.googlegroups.com>
Message-ID: <4BAD1E4B.5000000@gmail.com>

Luis M. Gonz?lez wrote:
> On 26 mar, 11:49, kj <no.em... at please.post> wrote:
>   
>> What's the word on using "classes as namespaces"?  E.g.
>>
>> class _cfg(object):
>>     spam = 1
>>     jambon = 3
>>     huevos = 2
>>
>> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
>>     
>
> I see no problem.
> I wouldn't mix English, French and Spanish in the same recipe though...
>   
Why? Do you think it might get over cooked? ;c)

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From winstonwolff at gmail.com  Fri Mar 26 17:34:42 2010
From: winstonwolff at gmail.com (Winston)
Date: Fri, 26 Mar 2010 14:34:42 -0700 (PDT)
Subject: Revisiting Generators and Subgenerators
References: <bc11ef60-2d6e-46d7-94b4-ed2096834b33@f12g2000prn.googlegroups.com>
	<32b967ce-bb76-45ad-8660-c1d96a35fc72@g11g2000yqe.googlegroups.com>
Message-ID: <c9c3b6ae-a43e-4400-9fbe-00f9a42fa336@w39g2000prd.googlegroups.com>

On Mar 26, 7:29?am, Sebastien Binet <seb.bi... at gmail.com> wrote:
> > Proposal for a new Generator Syntax in Python 3K--
> > A Baton object for generators to allow subfunction to yield, and to
> > make
> > them symetric.
>
> isn't a Baton what CSP calls a channel ?
>
> there is this interesting PyCSP library (which implements channels
> over greenlets, os-processes (via multiprocessing) or python threads)http://code.google.com/p/pycsp
>
> cheers,
> sebastien.

Thanks for the link. After reading about Greenlets, it seems my Baton
is a Greenlet. It is not passed in to the new greenlet as I wrote
above, but both sides use it to pass execution to the other, and to
send a value on switching.

I'm glad my thinking is matching other people's thinking. Now I have
to search for a greenlet written for Jython.

And thanks to others for their thoughts on this subject.

-Winston


From novacompute at gmail.com  Fri Mar 26 17:58:08 2010
From: novacompute at gmail.com (wukong)
Date: Fri, 26 Mar 2010 14:58:08 -0700 (PDT)
Subject: exec .exe
Message-ID: <f6859e00-5f36-488d-bcc2-1f6c36a69846@a10g2000pri.googlegroups.com>

newbie question, how do you run a .exe generated by MSVC++ in python
in windows?


From ldo at geek-central.gen.new_zealand  Fri Mar 26 18:05:34 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sat, 27 Mar 2010 11:05:34 +1300
Subject: sqlite version on windows
References: <4BAC8521.2@shopzeus.com>
	<mailman.1215.1269608278.23598.python-list@python.org>
Message-ID: <hojb3e$ujp$3@lust.ihug.co.nz>

In message <mailman.1215.1269608278.23598.python-list at python.org>, Philip 
Semanchuk wrote:

> On Mar 26, 2010, at 5:57 AM, Laszlo Nagy wrote:
>>
>> On my Linux system: Python version: 2.6.2 sqlite3.sqlite_version:
>> 3.6.10
>> On my Windows system: Python version: 2.6.5 sqlite3.sqlite_version:
>> 3.5.9
>>
>> Why is that?
> 
> The few Linux distros that I checked are much more aggressive about
> bundling newer versions of SQLite. For instance, Ubuntu 8.04 has
> Python 2.5.2 with SQLite 3.4.2, while Ubuntu 8.10 has the same version
> of Python but offers SQLite 3.5.9.
> 
> You asked "why" and I don't know. I imagine it comes down to
> philosophical differences or maybe just a lack of time to test when
> building new WIndows distros for Python.org.

Maybe the issues are more practical than philosophical. Linux distros use an 
integrated package manager and are maintained by a cohesive community. What 
that means is that the SQLite package isn?t just used by Python, but by a 
bunch of other stuff as well. So all the maintainers of those packages have 
an interest in making sure that SQLite doesn?t break them.

Whereas on Windows, the Python download has to include _all_ its 
dependencies, it cannot rely on a system-integrated package manager to 
automatically provide them. And the same is true for every other open-source 
package that anyone tries to pre-build for Windows. So they all have to 
provide their own installation routines, their own updates, their own 
testing ... in short, a lot of duplication of effort. This is expensive.


From emile at fenx.com  Fri Mar 26 18:09:24 2010
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 26 Mar 2010 15:09:24 -0700
Subject: OT: Meaning of "monkey"
In-Reply-To: <e684e6ae-be88-4d2b-8447-733f3a10d882@z11g2000yqz.googlegroups.com>
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>	<6eca52f7-0a55-4c96-8144-9face3c88124@15g2000yqi.googlegroups.com>
	<e684e6ae-be88-4d2b-8447-733f3a10d882@z11g2000yqz.googlegroups.com>
Message-ID: <hojbec$hi5$1@dough.gmane.org>

On 3/26/2010 1:18 PM Mensanator said...
> On Mar 26, 2:44 pm, Phlip<phlip2... at gmail.com>  wrote:
>> On Mar 26, 6:14 am, Luis M. Gonz?lez<luis... at gmail.com>  wrote:
>>
>>> Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
>>> Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
>>
>>> Monkeys everywhere.
>>> Sorry for the off topic question, but what does "monkey" mean in a
>>> nerdy-geek context??
>>
>>> Luis
>>
>> Better at typing than thinking.
>
> Really? I thought it was more of a reference to Eddington, i.e., given
> enough time even a monkey can type out a program.

I like the quote that went along the lines of 'here we are, and no we 
haven't'





From irmen-NOSPAM- at xs4all.nl  Fri Mar 26 18:10:38 2010
From: irmen-NOSPAM- at xs4all.nl (Irmen de Jong)
Date: Fri, 26 Mar 2010 23:10:38 +0100
Subject: exec .exe
In-Reply-To: <f6859e00-5f36-488d-bcc2-1f6c36a69846@a10g2000pri.googlegroups.com>
References: <f6859e00-5f36-488d-bcc2-1f6c36a69846@a10g2000pri.googlegroups.com>
Message-ID: <4bad3060$0$22937$e4fe514c@news.xs4all.nl>

On 26-3-2010 22:58, wukong wrote:
> newbie question, how do you run a .exe generated by MSVC++ in python
> in windows?

Use the subprocess module, for instance:
subprocess.call(["notepad.exe", "d:/file.txt"])

irmen


From cs at zip.com.au  Fri Mar 26 18:28:28 2010
From: cs at zip.com.au (Cameron Simpson)
Date: Sat, 27 Mar 2010 09:28:28 +1100
Subject: Revisiting Generators and Subgenerators
In-Reply-To: <32b967ce-bb76-45ad-8660-c1d96a35fc72@g11g2000yqe.googlegroups.com>
References: <32b967ce-bb76-45ad-8660-c1d96a35fc72@g11g2000yqe.googlegroups.com>
Message-ID: <20100326222828.GA15135@cskk.homeip.net>

On 26Mar2010 07:29, Sebastien Binet <seb.binet at gmail.com> wrote:
| On Mar 25, 10:39?pm, Winston <winst... at stratolab.com> wrote:
| > A Baton object for generators to allow subfunction to yield, and to
| > make them symetric.
| 
| isn't a Baton what CSP calls a channel ?

I was thinking about this (roughly) in the shower this morning before
seeing this message.

One difference is that a Channel or zero-storage Queue lets the putter
continue execution after the put (or at least the other side's get). A
co-routine won't proceed until later, no? So a co-routine setup will do
lazier computation than a similar threaded setup.

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

Principles have no real force except when one is well fed.      - Mark Twain


From novacompute at gmail.com  Fri Mar 26 18:48:02 2010
From: novacompute at gmail.com (wukong)
Date: Fri, 26 Mar 2010 15:48:02 -0700 (PDT)
Subject: exec .exe
References: <f6859e00-5f36-488d-bcc2-1f6c36a69846@a10g2000pri.googlegroups.com>
	<4bad3060$0$22937$e4fe514c@news.xs4all.nl>
Message-ID: <8524a2ad-1f16-45b1-9c56-6f8b5b7e1413@l12g2000pra.googlegroups.com>

On Mar 26, 3:10?pm, Irmen de Jong <irmen-NOSP... at xs4all.nl> wrote:
> On 26-3-2010 22:58, wukong wrote:
>
> > newbie question, how do you run a .exe generated by MSVC++ in python
> > in windows?
>
> Use the subprocess module, for instance:
> subprocess.call(["notepad.exe", "d:/file.txt"])
>
> irmen

worked like a charm, :-)  thanks irmen.


From tjreedy at udel.edu  Fri Mar 26 19:43:18 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 26 Mar 2010 19:43:18 -0400
Subject: Have you embraced Python 3.x yet?
In-Reply-To: <hoicgd$23v0$1@news.telesweet.net>
References: <hoicgd$23v0$1@news.telesweet.net>
Message-ID: <hojgqk$uuc$1@dough.gmane.org>

On 3/26/2010 9:23 AM, Harishankar wrote:
> Have you people embraced Python 3.x?

Yes. My current work only needs the stdlib and I much prefer the 
streamlined language.



From steve at REMOVE-THIS-cybersource.com.au  Fri Mar 26 20:03:30 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 27 Mar 2010 00:03:30 GMT
Subject: Classes as namespaces?
References: <hoihgt$p6t$1@reader1.panix.com>
Message-ID: <4bad4b52$0$27866$c3e8da3@news.astraweb.com>

On Fri, 26 Mar 2010 14:49:02 +0000, kj wrote:

> What's the word on using "classes as namespaces"? 


>>> import this
[...]
Namespaces are one honking great idea -- let's do more of those!




> [*] My own subjective dislike for the widespread practice of using
> triple quotes to comment out code is formally similar to this one ("the
> 'intended use' for triple-quoting is not to comment out code", etc.). 

On the contrary. CPython deliberately strips bare strings (whether triple 
quoted or not) out during compilation. This isn't an accident, it is 
deliberate.


>>> code = """
... x = 1
... y = 2
... # comment
... "a string"
... z = 4
... """
>>> o = compile(code, '', 'exec')
>>> dis.dis(o)
  2           0 LOAD_CONST               0 (1)
              3 STORE_NAME               0 (x)

  3           6 LOAD_CONST               1 (2)
              9 STORE_NAME               1 (y)

  6          12 LOAD_CONST               2 (4)
             15 STORE_NAME               2 (z)
             18 LOAD_CONST               3 (None)
             21 RETURN_VALUE


Why should you not do this? First, it is implementation-specific: other 
Pythons may not behave the same. Potentially they may compile in the 
(potentially large) string, push it on the stack, then immediately pop it 
off again. Older versions of CPython used to do that for non-strings.


Secondly, and FAR more importantly, leaving large amounts of commented 
out code in your source is a TERRIBLE idea. Yes, sure, it's tempting to 
do, especially for quick and dirty scripts. Resist the temptation. Learn 
how to use a proper code repository. Don't leave the detritus of ancient 
unused code in your source files -- it confuses the reader, makes 
searching harder, slows down parsing, and (trust me) you will never need 
to read the old code again. It just gets in the way.

Of course, like everything, this needs to be considered in context. You 
might leave commented-out code like this:

# DON'T DO THIS:
# s = spam(s, s*2)
# It doesn't work. See bug #12345 in the tracker. Instead do this:
s = spam(s*2, s)



-- 
Steven


From debatem1 at gmail.com  Fri Mar 26 20:33:12 2010
From: debatem1 at gmail.com (geremy condra)
Date: Fri, 26 Mar 2010 20:33:12 -0400
Subject: Have you embraced Python 3.x yet?
In-Reply-To: <hoicgd$23v0$1@news.telesweet.net>
References: <hoicgd$23v0$1@news.telesweet.net>
Message-ID: <f3cc57c61003261733k79f996e1w8a02b580e930b65d@mail.gmail.com>

On Fri, Mar 26, 2010 at 9:23 AM, Harishankar <v.harishankar at gmail.com> wrote:
> Have you people embraced Python 3.x or still with 2.5 or 2.6?
>
> I personally want to switch over but not too sure how many people are
> using 3.x as opposed to 2 so I want to keep my programs compatible for
> the majority.
>
> -- Hari
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Yes- I write new code in 3.x and backport it PRN.

Geremy Condra


From ethan at stoneleaf.us  Fri Mar 26 20:59:21 2010
From: ethan at stoneleaf.us (Ethan Furman)
Date: Fri, 26 Mar 2010 17:59:21 -0700
Subject: Python database of plain text editable by notepad or vi
In-Reply-To: <a62686e9-5b8e-4c24-a092-b95554b9536e@30g2000yqi.googlegroups.com>
References: <93d7991f-d688-4692-b34f-2fa571cebbdf@q15g2000yqj.googlegroups.com>	<46822448-2984-4ef6-85c7-bef834e2e86c@r1g2000yqj.googlegroups.com>
	<3d897b92-9def-4339-ac19-b06b5fb9705e@e6g2000yqh.googlegroups.com>
	<a62686e9-5b8e-4c24-a092-b95554b9536e@30g2000yqi.googlegroups.com>
Message-ID: <4BAD5869.1010107@stoneleaf.us>

Jon Clements wrote:
> On 26 Mar, 09:49, James Harris <james.harri... at googlemail.com> wrote:
> 
>>On 25 Mar, 22:56, Jon Clements <jon... at googlemail.com> wrote:
>>
>>
>>
>>
>>>On 25 Mar, 22:40, James Harris <james.harri... at googlemail.com> wrote:
>>
>>>>I am looking to store named pieces of text in a form that can be
>>>>edited by a standard editor such as notepad (under Windows) or vi
>>>>(under Unix) and then pulled into Python as needed. The usual record
>>>>locking and transactions of databases are not required.
>>
>>>>Another way to look at it is to treat the separate files as entries in
>>>>a dictionary. The file name would be the key and the lines of the file
>>>>the value.
>>
>>>>Anyone know of a database (with a Python interface) which will allow
>>>>text files to be treated as database fields? If not I can just write
>>>>it but I thought it best to ask if there was an existing solution
>>>>first.
>>
>>...
>>
>>>I could be missing something here, but aren't you basically just
>>>talking about an OS's filesystem?
>>
>>For storage, yes. The files would be marked-up text stored in the
>>filesystem. The "dbms" (I use the term loosely!) would provide access
>>to them by some full or partial key mechanism yet to be determined.
>>Read-only access would do - at least for now.
>>
>>
>>>glob or listdir somewhere, then create a dict using the file contents
>>>would meet your criteria, with very little lines of code -- but I
>>>would be interested to know what the use-case was for this... Is it
>>>read completely at start up time, or if each file contains a large
>>>amount of lines and aren't fixed width (or has no other indexing
>>>support without maintenance), then is a complete sequential-scan
>>>required each time, or do you just tell the user to not update when
>>>running (unless I s'pose something along the lines of a SIGHUP for
>>>config files is applicable).
>>
>>All good questions. For now, at least, the files can be read-only and
>>I'd want those on disk to be the master copies at all times. If I was
>>writing it myself I'd probably 'cache' some files in memory and stat
>>them before use. If newer I would reread the file.
>>
> 
> 
> It's hard to bore this group :)
> 
> 
>>
>>>Sorry, just don't understand why you'd want this.
>>
>>I tried to avoid boring folks with the details. I'm toying with some
>>ideas for a way to help generate source code (in various languages,
>>not just Python). If it goes ahead the text files would be mainly
>>marked-up code snippets - with or without symbols that need to be
>>replaced.
>>
>>Rather than write one single monolithic app I thought to split it into
>>reusable components. One part being data access could perhaps be an
>>existing database (and I'll take a look at jkn's suggestion).
>>
>>Think of the database as similar to an associative array stored on
>>disk. The only difference is I may want to play fast and loose with
>>the keys in some ways - e.g. check for partial key matches or return a
>>list of part-matched keys. The language name could be part of the key
>>but I'd also need to store variants for specific language versions.
>>I'm not sure yet how it will all pan out. As I say, just throwing
>>around some ideas.
>>
>>James
> 
> 
> Thanks for the explanation.
> 
> Who admins and, who's editing this data?
> 
> I couldn't 100% guarantee that I could modify a text file and always
> put the right
> delimiter in the right place and remember to escape the relevant chars
> (and I'm
> probably not the 'average' user).
> 
> Any opposition to just putting it in a 'proper' DB, then 'blobbing'
> the values?
> (or just integrate a procedure/script/function whatever your chosen
> RDBMS calls to choose it).
> Or in some systems, 'externally referencing'... loads of DB's have
> free front-ends,
> and there are lots of Python libraries.
> 
> I think perhaps, all I'm saying is, I'd choose a different approach.
> I'd provide a front-end, rather than choose to re-write the wheel over
> DB's.

Just to provide a counter-viewpoint:

The (one) system I have worked with that was like that (program source 
files kept in blobs in a database) I absolutely hated.  I was stuck with 
using  the tools provided by the app (which, amazingly enough, I also 
hated ;), and unable to use my own tools because because *my* source 
files were _not_ saved as *files*.  Okay, venting over.

My point is, if what you are storing is plain ol' source files, 
providing a way to directly access them is a good thing.  If what you 
are storing is a mangled version, the ability to let the user choose any 
editor to use is a good thing.  :)

My $0.02.

~Ethan~


From nocbos at gmail.com  Fri Mar 26 21:18:07 2010
From: nocbos at gmail.com (C. B.)
Date: Fri, 26 Mar 2010 18:18:07 -0700 (PDT)
Subject: Automatic import ?
References: <4d167b6b-04fb-42bb-9c21-ab66d0fb4367@k17g2000yqb.googlegroups.com>
	<mailman.1214.1269606975.23598.python-list@python.org>
Message-ID: <f4f7a234-e1c4-4f5c-8b0b-a089cafa7607@h18g2000yqo.googlegroups.com>

At first, thank you all for your answers.

Some more details about what I'm coding and what I need...

The classes AAA and BBB are just given as examples. In fact, BBB's
constructor accepts several parameters, meaning it can be different
for each creation of AAA. So it can't be simply skipped from the AAA's
one, even if there can be a default value.

Making AAA do the call to BBB is a solution, but, in that case, the
end-user loses the reference to the used BBB instance.

Concerning the reason why I wish to avoid importing, once again AAA
and BBB were just examples. I plan to add more classes, so AAA will
also need CCC, DDD, and so on to work.

It takes time to write the relative importations, that's ok, but I
think it could be more pleasant for the end-user to not have to write
a huge list of "from mymodule import xxx" if it is possible to take
advantage of automatic importations.

Cheers,


From apt.shansen at gmail.invalid  Fri Mar 26 21:45:54 2010
From: apt.shansen at gmail.invalid (Stephen Hansen)
Date: Fri, 26 Mar 2010 18:45:54 -0700
Subject: GIF89A and PIL
Message-ID: <2010032618455468300-aptshansen@gmailinvalid>

Hi, all.

Is it possible to get PIL to save GIF's in GIF89A format, instead of 
GIF87A? If not, are there any decent other image libraries out there 
that anyone's familiar with? The only one I could find was 
PythonMagick, which seems completely undocumented. Or I'm blind.

Ahem.

But the problem is, I have a nice, small little 72 byte GIF89A file, 
that I want to do some slight tweaking on and then re-save. I noticed 
that even if I completely skipped the tweaking step and -just- saved, 
it exploded into a 919 byte GIF87A file. And in this context, bytes 
really, really matter. I picked GIF over PNG because the same file in 
PNG was 120 bytes :)

I'm not an expert on graphics, so I don't actually know for certain if 
its the fact that PIL is saving in GIF87A format that's causing the 
size to explode, it might just be that PIL is doing.. Something Weird 
when it saves it as a GIF, too.

To demonstrate:

>>> f = open('../tiles/BaseTemplate.gif', 'rb')
>>> d1 = f.read()
>>> len(d1)
73
>>> d1
'GIF89a\x10\x00\x10\x00\x80\x00\x00\xff\xff\xff\x00\x00\x00!\xf9\x04\x00\x00\x00\x00\x00,\x00\x00\x00\x00\x10\x00\x10\x00\x00\x02 
\x8c\x8fi\xc0\xed\xbe\x9edq\xbej\x1b\xce`go\x81\x93(\x91W\xc0AhJ\xad\xac\xa9*\xb2Q\x00\x00;'
>>> 

im = Image.open('../tiles/BaseTemplate.gif')
>>> import cStringIO
>>> cfp = cStringIO.StringIO()
>>> im.save(cfp, format="gif")
>>> cfp.seek(0)
>>> d2 = cfp.read()
>>> d2
'GIF87a\x10[...snip...]\x00;'
>>> len(d2)
919

-- 
--S

... p.s: change the ".invalid" to ".com" in email address to reply privately.



From steve at REMOVE-THIS-cybersource.com.au  Fri Mar 26 22:00:24 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 27 Mar 2010 02:00:24 GMT
Subject: Automatic import ?
References: <4d167b6b-04fb-42bb-9c21-ab66d0fb4367@k17g2000yqb.googlegroups.com>
	<mailman.1214.1269606975.23598.python-list@python.org>
	<f4f7a234-e1c4-4f5c-8b0b-a089cafa7607@h18g2000yqo.googlegroups.com>
Message-ID: <4bad66b8$0$27866$c3e8da3@news.astraweb.com>

On Fri, 26 Mar 2010 18:18:07 -0700, C. B. wrote:

> It takes time to write the relative importations, that's ok, but I think
> it could be more pleasant for the end-user to not have to write a huge
> list of "from mymodule import xxx" if it is possible to take advantage
> of automatic importations.

You mean by black magic? Something like this?


>>> GGG = "My really important value"
>>> from mymodule import AAA
>>> print AAA()
"something"
>>> print GGG
<class 'mymodule.GGG'>
>>> print "WTF happened to my important value???"
'magic ate it'


As a general rule, Python does not allow magic. One exception is:

from mymodule import *


however once you have been bitten by it, you will soon learn to avoid it 
as almost always a bad idea.



-- 
Steven


From timr at probo.com  Fri Mar 26 23:15:27 2010
From: timr at probo.com (Tim Roberts)
Date: Fri, 26 Mar 2010 20:15:27 -0700
Subject: Advice Criticism on Python App
References: <de18cb49-b0fd-4862-b9af-3743720e0db6@u19g2000prh.googlegroups.com>
	<uholq5peen08i78f968juvhskpedhhnlr3@4ax.com>
	<pan.2010.03.25.05.10.05@REMOVE.THIS.cybersource.com.au>
Message-ID: <rutqq5hi7188avjt6cc2t0bff3et03gg23@4ax.com>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:

>On Wed, 24 Mar 2010 21:14:23 -0700, Tim Roberts wrote:
>
>> Jimbo <nilly16 at yahoo.com> wrote:
>>>
>>>class stock:
>>>    code             = ""
>>>    purchasePrice    = 0
>>>    purchaseQuantity = 0
>>>    price            = []  # list of recent prices 
>>>    recentBid        = []  # list of recent bids for stock
>>>    recentOffer      = []  # list of recent offers for stock
>>>    stockVol         = []  # list of stock quantity available on market
>> 
>> Using lists as class variables is a very good way to create very
>> surprising bugs.  Consider the following:
>
>Don't you think that the class attributes are *supposed* to be shared by 
>all instances? In that case the behaviour you show is not a bug at all.

Yes, it occurred to me just after I sent that pot that I had answered a
different question from the one he asked.  I SUSPECT that he is using class
variables as a way to initialize members, not as true class variables.

Thanks for clarifying this.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From python at mrabarnett.plus.com  Fri Mar 26 23:50:00 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 27 Mar 2010 03:50:00 +0000
Subject: Automatic import ?
In-Reply-To: <f4f7a234-e1c4-4f5c-8b0b-a089cafa7607@h18g2000yqo.googlegroups.com>
References: <4d167b6b-04fb-42bb-9c21-ab66d0fb4367@k17g2000yqb.googlegroups.com>	<mailman.1214.1269606975.23598.python-list@python.org>
	<f4f7a234-e1c4-4f5c-8b0b-a089cafa7607@h18g2000yqo.googlegroups.com>
Message-ID: <4BAD8068.3010309@mrabarnett.plus.com>

C. B. wrote:
> At first, thank you all for your answers.
> 
> Some more details about what I'm coding and what I need...
> 
> The classes AAA and BBB are just given as examples. In fact, BBB's
> constructor accepts several parameters, meaning it can be different
> for each creation of AAA. So it can't be simply skipped from the AAA's
> one, even if there can be a default value.
> 
> Making AAA do the call to BBB is a solution, but, in that case, the
> end-user loses the reference to the used BBB instance.
> 
> Concerning the reason why I wish to avoid importing, once again AAA
> and BBB were just examples. I plan to add more classes, so AAA will
> also need CCC, DDD, and so on to work.
> 
> It takes time to write the relative importations, that's ok, but I
> think it could be more pleasant for the end-user to not have to write
> a huge list of "from mymodule import xxx" if it is possible to take
> advantage of automatic importations.
> 
Couldn't you just have:

     import mymodule as m

and then use:

     m.AAA
     m.BBB

and so on?

It's not much longer and it avoids 'magic'.


From ldo at geek-central.gen.new_zealand  Sat Mar 27 00:37:10 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sat, 27 Mar 2010 17:37:10 +1300
Subject: GIF89A and PIL
References: <2010032618455468300-aptshansen@gmailinvalid>
Message-ID: <hok21n$bqo$2@lust.ihug.co.nz>

In message <2010032618455468300-aptshansen at gmailinvalid>, Stephen Hansen 
wrote:

> Is it possible to get PIL to save GIF's in GIF89A format, instead of
> GIF87A?

Why? What does GIF do for you that PNG doesn?t?


From apt.shansen at gmail.invalid  Sat Mar 27 00:53:10 2010
From: apt.shansen at gmail.invalid (Stephen Hansen)
Date: Fri, 26 Mar 2010 21:53:10 -0700
Subject: GIF89A and PIL
References: <2010032618455468300-aptshansen@gmailinvalid>
	<hok21n$bqo$2@lust.ihug.co.nz>
Message-ID: <2010032621531095506-aptshansen@gmailinvalid>

On 2010-03-26 21:37:10 -0700, Lawrence D'Oliveiro said:

> In message <2010032618455468300-aptshansen at gmailinvalid>, Stephen Hansen
> wrote:
> 
>> Is it possible to get PIL to save GIF's in GIF89A format, instead of
>> GIF87A?
> 
> Why? What does GIF do for you that PNG doesn?t?

If I take this PSD and save it as a GIF as fully optimized as possible, 
its 72 bytes; do the same with PNG, and its 120.

In this situation that difference really is very important.

-- 
--S

... p.s: change the ".invalid" to ".com" in email address to reply privately.



From greg.ewing at canterbury.ac.nz  Sat Mar 27 01:18:40 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sat, 27 Mar 2010 17:18:40 +1200
Subject: from import and __init__.py
In-Reply-To: <mailman.1197.1269556129.23598.python-list@python.org>
References: <20100325101632.GA4727@xs4all.nl> <hog3r2$8mr$1@dough.gmane.org>
	<mailman.1197.1269556129.23598.python-list@python.org>
Message-ID: <815i6bF3lcU1@mid.individual.net>

egbert wrote:

> Yes, you are right. And I can reach everything with
> modules['some_package']
> or variants thereof.

Although note that the usual way to get it would be
to simply do

   import some_package

-- 
Greg


From greg.ewing at canterbury.ac.nz  Sat Mar 27 01:23:19 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sat, 27 Mar 2010 17:23:19 +1200
Subject: Represent object type as
In-Reply-To: <6a6a37e3-f04f-4b63-9134-7ca9fd137297@f14g2000pre.googlegroups.com>
References: <6a6a37e3-f04f-4b63-9134-7ca9fd137297@f14g2000pre.googlegroups.com>
Message-ID: <815if2F3lcU2@mid.individual.net>

Jason wrote:
> I'm reusing the __getstate__ function I wrote for pickling like
> so:

Instead of reinventing part of pickle, is there some reason
you couldn't just use it?

-- 
Greg


From anythinginternetseo at gmail.com  Sat Mar 27 01:26:02 2010
From: anythinginternetseo at gmail.com (anything internet)
Date: Fri, 26 Mar 2010 22:26:02 -0700 (PDT)
Subject: Stop the Heat from Sun Rays!
Message-ID: <b04e5a8a-e2dd-4e11-a473-986645db29ef@t34g2000prm.googlegroups.com>

Stop the Heat! Stop UV Damage! Save Money! -
 More Details : http://www.suntechglasstinting.com/welcome.php


From matttibbals69 at yahoo.com  Sat Mar 27 01:48:45 2010
From: matttibbals69 at yahoo.com (matttibbals)
Date: Fri, 26 Mar 2010 22:48:45 -0700 (PDT)
Subject: python
Message-ID: <65354fef-2e84-4182-bfdb-69dc5468e9b6@f12g2000prn.googlegroups.com>

I'm Matt Tibbals, pedophile.  http://www.matthewtibbals.com


From lacrima.maxim at gmail.com  Sat Mar 27 02:10:59 2010
From: lacrima.maxim at gmail.com (Lacrima)
Date: Fri, 26 Mar 2010 23:10:59 -0700 (PDT)
Subject: Advanced Python Programming Oxford Lectures [was: Re: *Advanced* 
	Python book?]
References: mailman.1182.1269520510.23598.python-list@python.org 
	<54e41616-df9f-42dd-9c91-9e530650bd99@j21g2000yqh.googlegroups.com> 
	<9dd0d6b0-7249-4a6f-8d03-b0c3a44eace2@l25g2000yqd.googlegroups.com>
Message-ID: <fff09a1a-e925-46be-bdba-4ede830e55ab@k17g2000yqb.googlegroups.com>

On Mar 26, 10:22?am, Michele Simionato <michele.simion... at gmail.com>
wrote:
> On Mar 25, 2:24?pm, Michele Simionato <michele.simion... at gmail.com>
> wrote:
>
> > On Mar 25, 1:28?pm, Ethan Furman <et... at stoneleaf.us> wrote:
>
> > > Michele,
>
> > > Was wondering if you'd had a chance to re-post your lectures -- just did
> > > a search for them and came up empty, and I would love to read them!
>
> > > Many thanks in advance!
>
> > Oops, I forgot! I will try to make them available soon.
>
> Here they are:http://www.phyast.pitt.edu/~micheles/oxford-lectures.zip

Hello, Michele!
Thanks a lot for posting!!!


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From: vipshopper.us at hotmail.com (marrylin)
Date: Sat, 27 Mar 2010 00:53:05 -0700 (PDT)
Subject: Hello,everybody,the good shoping place,the new year approaching, 
	click in. Let's facelift bar! ===== HTTP://loveshopping.us   ====
Message-ID: <31437927-ccfd-403f-b79e-e349e662b286@33g2000yqj.googlegroups.com>

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From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 27 06:18:35 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 27 Mar 2010 10:18:35 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
Message-ID: <4baddb7b$0$27866$c3e8da3@news.astraweb.com>

On Fri, 26 Mar 2010 07:31:17 -0700, Steve Howell wrote:

> From a purely academic standpoint, I'm not convinced that sum() is
> inefficient in terms of big-O complexity, though.
> 
>  showell at showell-laptop:~$ python
>  Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41) [GCC 4.3.3] on
>  linux2
>  >>> class StupidList:
[...]

But it's not *sum* that is inefficient, it is sum *with a particular data 
structure*.

Sure, if you create your own data structure, you can make it as efficient 
as you like. Obviously the sum algorithm itself has to perform one 
addition per item, or O(N), which scales tolerably well. But each 
addition has a cost. If the cost is constant, then sum() as a whole 
remains O(N). But if the cost of addition varies with N, sum() degrades 
badly.

We can compare the performance of sum with different data structures, 
starting with plain integers versus long integers:

>>> from timeit import Timer
>>> setup = 'data = [%d]*%d'
>>> for i in range(6):
...     t1 = Timer('sum(data, 0)', setup % (1, 10**i))
...     t2 = Timer('sum(data, 0)', setup % (10**50, 10**i))
...     print min(t1.repeat(number=1000)),
...     print min(t2.repeat(number=1000))
...
0.00179290771484 0.00263810157776
0.00340414047241 0.00854396820068
0.0190401077271 0.0502791404724
0.155302047729 0.645124912262
0.794432878494 2.55748295784
7.97877693176 25.3812758923

Both scale about as well, but the cost varies significantly: arithmetic 
on very large longints is expensive.

Strings, with a trick to fool sum into accepting them, versus lists. Note 
that I changed the number of iterations from 6 down to 5. The reason why 
will become obvious:

>>> class EmptyStringStarter:
...     def __add__(self, other):
...         return other
... 
>>> empty = EmptyStringStarter()
>>> setup = """from __main__ import empty; data = [%r]*%d"""
>>> 
>>> for i in range(5):
...     t1 = Timer('sum(data, empty)', setup % ('a', 10**i))
...     t2 = Timer('sum(data, [])', setup % ([1], 10**i))
...     print min(t1.repeat(number=1000)),
...     print min(t2.repeat(number=1000))
...
0.00849103927612 0.00226998329163
0.0121459960938 0.0082700252533
0.0489149093628 0.186735153198
0.428920030594 5.28623914719
14.6552250385 589.102822065


Strings perform tolerably well, up to a point, but lists perform 
terribly. And in fact, the relatively good performance of strings is an 
artifact of recent versions of CPython. In Jython and IronPython, and 
older versions of CPython, it will behave as poorly as lists.


> I wonder how severely sum(), without
> the restriction, would underperform join() on modern versions of Python,
> though.


Take note that, in order to get an answer in reasonable time, I've 
reduced the number of timing iterations drastically:

>>> for i in range(6):
...     t1 = Timer('sum(data, empty)', setup % ('a', 10**i))
...     t2 = Timer('"".join(data)', setup % ('a', 10**i))
...     print min(t1.repeat(number=10)),
...     print min(t2.repeat(number=10))
...
8.89301300049e-05 1.09672546387e-05
0.000131845474243 2.19345092773e-05
0.000591993331909 9.29832458496e-05
0.0101289749146 0.00082802772522
0.365957021713 0.00884819030762
24.2072279453 0.0421011447906

Note the performance degradation of sum. It gets worse. Much worse:

>>> for i in range(4, 7):
...     t1 = Timer('sum(data, empty)', setup % ('a', 10**i))
...     t2 = Timer('"".join(data)', setup % ('a', 10**i))
...     print min(t1.repeat(number=1)),  # note fewer iterations
...     print min(t2.repeat(number=1))
...
0.031229019165 0.000817060470581
2.45445990562 0.00365781784058
1024.79705095 0.0398509502411

This is absolutely catastrophic performance degradation.



-- 
Steven


From davea at ieee.org  Sat Mar 27 06:18:40 2010
From: davea at ieee.org (Dave Angel)
Date: Sat, 27 Mar 2010 05:18:40 -0500
Subject: Traversing through Dir()
In-Reply-To: <d0fa7167-86e7-4ffa-953e-67b3c07b5f2d@q21g2000yqm.googlegroups.com>
References: <d2459161-1a78-4380-8687-1497c9349a9d@g11g2000yqe.googlegroups.com>	<hohqgi$kso$1@news.eternal-september.org>
	<d0fa7167-86e7-4ffa-953e-67b3c07b5f2d@q21g2000yqm.googlegroups.com>
Message-ID: <4BADDB80.90003@ieee.org>



Andrej Mitrovic wrote:
> On Mar 26, 9:18 am, "Alf P. Steinbach" <al... at start.no> wrote:
>   
>> <snip>
>> hierarchy =nspect.getclasstree( classes )
>> # 'hierarchy' is a list array of tuples and nested list arrays of the same form.
>> # The top level is an array of two items, the first item a tuple describing the
>> 'object'
>> # class, and the second item a list array representing the BaseException hierarchy.
>> print_hierarchy( hierarchy[1], level = )
>> </code>
>>
>> Cheers & hth.,
>>
>> - Alf
>>     
>
> Thanks for all of that. And yes, I've noticed I get into infinite
> recursions all the time, which is why I was asking if there was a
> simple way to do this. I'll have a look at these later.
>
> Kind regards,
> Andrej Mitrovic
>
>   
I can't help with the original question, but generally the cure for 
getting into infinite recursion when traversing a tree with multiple 
connections is to keep a set() of all visited nodes.  Whenever you hit a 
node a second time, don't visit it or its dependents.  It's not hard to 
add to otherwise working code, and frequently the easiest place is right 
at the beginning of the recursive function.
       if new_node in myset:
             return
      myset.add(new_node)
     ...process_this_node...
     for child in new_node:
           ...recurse...

HTH
DaveA



From v.harishankar at gmail.com  Sat Mar 27 07:06:36 2010
From: v.harishankar at gmail.com (Harishankar)
Date: Sat, 27 Mar 2010 11:06:36 +0000 (UTC)
Subject: Any examples/documentation for python-newt
Message-ID: <hokorf$21qc$4@news.telesweet.net>

I am writing a fairly featureful TUI in python and I figured newt is the 
best lightweight TUI which actually offers widgets. curses is low level 
and its text editing capabilities are poor while UIs like urwid and stfl 
too complex for simple programs like the ones I am creating.

Could anybody point me to at least a decent example program in newt/snack 
and I don't mean popcorn.py or peanuts.py. Something that at least shows 
how to create a basic menu-driven program in the command line with a main 
menu and implementing several sub menus. Also a bit of explanation of the 
behaviour of OK and Cancel buttons in standard forms would be of help.

So anybody uses newt? Or have people stopped using text based UIs 
completely?

-- 
-- Harishankar (http://harishankar.org http://literaryforums.org)



-- 
-- Harishankar (http://harishankar.org http://literaryforums.org)


From tartley at tartley.com  Sat Mar 27 07:28:56 2010
From: tartley at tartley.com (Jonathan Hartley)
Date: Sat, 27 Mar 2010 04:28:56 -0700 (PDT)
Subject: Classes as namespaces?
References: <hoihgt$p6t$1@reader1.panix.com>
	<69463be0-d839-43cf-a8a7-1cc9081f672d@r27g2000yqn.googlegroups.com>
Message-ID: <52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>

On Mar 26, 6:26?pm, Luis M. Gonz?lez <luis... at gmail.com> wrote:
> On 26 mar, 11:49, kj <no.em... at please.post> wrote:
>
> > What's the word on using "classes as namespaces"? ?E.g.
>
> > class _cfg(object):
> > ? ? spam = 1
> > ? ? jambon = 3
> > ? ? huevos = 2
>
> > breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
>
> I see no problem.
> I wouldn't mix English, French and Spanish in the same recipe though...


Hey everyone. By coincidence, only yesterday I was wondering about
using classes as a way of labeling a block of code, ie. an lightweight
alternative to defining a function that would only be called from one
location.

eg. instead of:


x = 1
((some complex logic))
y = 2


one might like to name the complex block of logic, just to make it
readable:


x = 1
def account_for_non_square_pixels(x):
   ((some complex logic))
account_for_non_square_pixels()
y = 2


But defining and then calling the function like that is a tad
cumbersome. So I was wondering about:



x = 1
class account_for_non_square_pixels:
  ((some complex logic))
y = 2


I don't exactly like this, but I think you can see what I'm getting
at. Does this fall down in some way I haven't grasped? Is it as awful
an abuse of 'class' as my intuition suggests it is? Is there a way to
do it better?


From jcd at sdf.lonestar.org  Sat Mar 27 07:54:06 2010
From: jcd at sdf.lonestar.org (J. Clifford Dyer)
Date: Sat, 27 Mar 2010 07:54:06 -0400
Subject: Classes as namespaces?
In-Reply-To: <52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
References: <hoihgt$p6t$1@reader1.panix.com>
	<69463be0-d839-43cf-a8a7-1cc9081f672d@r27g2000yqn.googlegroups.com>
	<52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
Message-ID: <20100327115406.GA22246@sdf.lonestar.org>

On Sat, Mar 27, 2010 at 04:28:56AM -0700, Jonathan Hartley wrote regarding Re: Classes as namespaces?:
> 
> Hey everyone. By coincidence, only yesterday I was wondering about
> using classes as a way of labeling a block of code, ie. an lightweight
> alternative to defining a function that would only be called from one
> location.
> 
> eg. instead of:
> 
> 
> x = 1
> ((some complex logic))
> y = 2
> 
> 
> one might like to name the complex block of logic, just to make it
> readable:
> 
> 
> x = 1
> def account_for_non_square_pixels(x):
>    ((some complex logic))
> account_for_non_square_pixels()
> y = 2
> 
> 
> But defining and then calling the function like that is a tad
> cumbersome. So I was wondering about:
> 
> 
> 
> x = 1
> class account_for_non_square_pixels:
>   ((some complex logic))
> y = 2
> 
> 
> I don't exactly like this, but I think you can see what I'm getting
> at. Does this fall down in some way I haven't grasped? Is it as awful
> an abuse of 'class' as my intuition suggests it is? Is there a way to
> do it better?
> -- 
> http://mail.python.org/mailman/listinfo/python-list

Hmm.  I don't like that because it leaves a class polluting your namespace that doesn't behave like a class.  Using a function for that purpose doesn't seem as bad, because even if you don't call it again, at least you *could*, and it would behave in an expected fashion.  

If you're dead-set against calling the chunk of code you just created, and you're using python 2.5 or higher, you might consider creating a no-op context manager:

    x = 1
    with code_block("Account for non square pixels"):
	    ((complex_logic))
	y = 2

Though in general, I think refactoring your code to reasonably scoped functions or methods is a better idea.  If it's too complex to read in one block, it's probably too complex for one function.


From jeanmichel at sequans.com  Sat Mar 27 07:54:42 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Sat, 27 Mar 2010 12:54:42 +0100
Subject: Classes as namespaces?
In-Reply-To: <52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
References: <hoihgt$p6t$1@reader1.panix.com>	<69463be0-d839-43cf-a8a7-1cc9081f672d@r27g2000yqn.googlegroups.com>
	<52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
Message-ID: <4BADF202.3090704@sequans.com>

Jonathan Hartley wrote:
> On Mar 26, 6:26 pm, Luis M. Gonz?lez <luis... at gmail.com> wrote:
>   
>> On 26 mar, 11:49, kj <no.em... at please.post> wrote:
>>
>>     
>>> What's the word on using "classes as namespaces"?  E.g.
>>>       
>>> class _cfg(object):
>>>     spam = 1
>>>     jambon = 3
>>>     huevos = 2
>>>       
>>> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
>>>       
>> I see no problem.
>> I wouldn't mix English, French and Spanish in the same recipe though...
>>     
>
>
> Hey everyone. By coincidence, only yesterday I was wondering about
> using classes as a way of labeling a block of code, ie. an lightweight
> alternative to defining a function that would only be called from one
> location.
>
> eg. instead of:
>
>
> x = 1
> ((some complex logic))
> y = 2
>
>
> one might like to name the complex block of logic, just to make it
> readable:
>
>
> x = 1
> def account_for_non_square_pixels(x):
>    ((some complex logic))
> account_for_non_square_pixels()
> y = 2
>
>
> But defining and then calling the function like that is a tad
> cumbersome. So I was wondering about:
>
>
>
> x = 1
> class account_for_non_square_pixels:
>   ((some complex logic))
> y = 2
>
>
> I don't exactly like this, but I think you can see what I'm getting
> at. Does this fall down in some way I haven't grasped? Is it as awful
> an abuse of 'class' as my intuition suggests it is? Is there a way to
> do it better?
>   
on good way to label part of the code is to simply add comments. You can 
also find tricks to indent this code block, but I've never seen that before.

x=1
# account for non square pixels
some complex logic
# done
y=2

I'm perfectly comfortable using classes for namespaces, 'cause classes 
implement objects or entities, and a namespaces can easily be designed 
as a coherent entity.
For labelling code that you will not reuse, I'm not sure classes are 
suitable in the way people may issue a 'WTF' when reading your code.

JM


From jcd at sdf.lonestar.org  Sat Mar 27 08:04:59 2010
From: jcd at sdf.lonestar.org (J. Clifford Dyer)
Date: Sat, 27 Mar 2010 08:04:59 -0400
Subject: Classes as namespaces?
In-Reply-To: <hoihgt$p6t$1@reader1.panix.com>
References: <hoihgt$p6t$1@reader1.panix.com>
Message-ID: <20100327120458.GB22246@sdf.lonestar.org>

On Fri, Mar 26, 2010 at 02:49:02PM +0000, kj wrote regarding Classes as namespaces?:
> 
> What's the word on using "classes as namespaces"?  E.g.
> 
> class _cfg(object):
>     spam = 1
>     jambon = 3 
>     huevos = 2
> 
> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
> 
> 
> Granted, this is not the "intended use" for classes, and therefore
> could be viewed as a misuse ("that's what dictionaries are for",
> etc.).  But other than this somewhat academic objection[*], I really
> can see no problem with using classes in this way.
> 
> And yet, I've come across online murky warnings against using
> classes as "pseudo-namespaces".  Is there some problem that I'm
> not seeing with this technique?
> 
> ~K

I don't see anything wrong with this, except that I would clean it up in a couple ways.  Like other posters, I would give the class a proper class name (Cfg).

I also would not assign integers to spam, jambon, or huevos.  Instead I would assign each a bare object().  That way you won't get unexpected interactions with other constants outside the class.  An object() is equal only to itself.

I would also not rule out letting your "pseudo-namespace" grow into a full-fledged class.  If you've got a method that makes sense with your class, use it.

class Cfg(object):
    spam = object()
	jambon = object()
    huevos = object()

	def get_animal(self, meat):
	    if meat == self.jambon:
			return 'pig'
		elif meat == self.huevos:
		    return 'chicken'
		elif meat = self.spam:
		    return 'spamalope'

Later, perhaps, you might refactor so that each meat type (OK so huevos aren't a meat) gets its own subclass, with a simple, one-line get_animal method.

Cheers,
Cliff


From steve at holdenweb.com  Sat Mar 27 08:22:17 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 27 Mar 2010 08:22:17 -0400
Subject: Classes as namespaces?
In-Reply-To: <20100327120458.GB22246@sdf.lonestar.org>
References: <hoihgt$p6t$1@reader1.panix.com>
	<20100327120458.GB22246@sdf.lonestar.org>
Message-ID: <hoktap$alu$1@dough.gmane.org>

J. Clifford Dyer wrote:
> On Fri, Mar 26, 2010 at 02:49:02PM +0000, kj wrote regarding Classes
> as namespaces?:
>> What's the word on using "classes as namespaces"?  E.g.
>> 
>> class _cfg(object): spam = 1 jambon = 3 huevos = 2
>> 
>> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
>> 
[...]
> I also would not assign integers to spam, jambon, or huevos.  Instead
> I would assign each a bare object().  That way you won't get
> unexpected interactions with other constants outside the class.  An
> object() is equal only to itself.
> 
It also has the advantage (?) that you can use "is" (identity)
comparisons rather than testing for equality, though this is only a
readability issue, I suspect.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From jeanmichel at sequans.com  Sat Mar 27 08:42:07 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Sat, 27 Mar 2010 13:42:07 +0100
Subject: Automatic import ?
In-Reply-To: <f4f7a234-e1c4-4f5c-8b0b-a089cafa7607@h18g2000yqo.googlegroups.com>
References: <4d167b6b-04fb-42bb-9c21-ab66d0fb4367@k17g2000yqb.googlegroups.com>	<mailman.1214.1269606975.23598.python-list@python.org>
	<f4f7a234-e1c4-4f5c-8b0b-a089cafa7607@h18g2000yqo.googlegroups.com>
Message-ID: <4BADFD1F.5000405@sequans.com>

C. B. wrote:
> [snip]
> It takes time to write the relative importations, that's ok, but I
> think it could be more pleasant for the end-user to not have to write
> a huge list of "from mymodule import xxx" if it is possible to take
> advantage of automatic importations.
>
> Cheers,
>   

In that particular case, replace automatic by implicit, and you got the 
reason why it is not a good idea.
Maybe in your case the C habits clashes to the python habits.

Talking about python, if the user needs to know about BBB, then it has 
to import it, perdiod. If the user needs to know about many objects, 
then it has to import them all, explicitly.
However it looks like all your objects belong to the same module, 
quoting MRAB:

"
Couldn't you just have:

    import mymodule as m

and then use:

    m.AAA
    m.BBB
"


You don't like prefixing your object with the namespace they belong to ? 
Well, you should :o)

JM


PS : I would'n have renamed the module, but that falls into personal 
preferences.


From ethan at stoneleaf.us  Sat Mar 27 09:13:01 2010
From: ethan at stoneleaf.us (Ethan Furman)
Date: Sat, 27 Mar 2010 06:13:01 -0700
Subject: Simple Traits
Message-ID: <4BAE045D.3080604@stoneleaf.us>

Wow.

I just stumbled across one of Michele Simionato's offerings, called 
simple traits (strait for short) which looks *really* cool.

You can find it here: http://pypi.python.org/pypi/strait/0.5.1

Extremely quick summary:

Instead of multiple inheritance, with it's range of problems, use single 
inheritance for the basics, and include traits for various extra 
functionality that you want your class to have.

As a side note, one of his blog entries at Artima talks about using 
composition instead of mixins when constructing a class, e.g. by doing:

class foo(object):
   import baz
   def __init__(self):
     self.baz.do_something()

which has the benefit (over mixins) of avoiding name-space pollution, as 
well as being able to tell where your methods are coming from.  The cool 
thing (to me, at least) was the realization of being able to use import 
statements in class construction.

Thanks, Michele!!

~Ethan~


From ethan at stoneleaf.us  Sat Mar 27 09:19:02 2010
From: ethan at stoneleaf.us (Ethan Furman)
Date: Sat, 27 Mar 2010 06:19:02 -0700
Subject: Simple Traits Questions
Message-ID: <4BAE05C6.4070601@stoneleaf.us>

Okay, different post for my actual questions.  :)

On the PyPI page for strait (http://pypi.python.org/pypi/strait/0.5.1) 
it has the example of choosing which methods to keep in the composed class:

class TOSWidget(BaseWidget):
     __metaclass__ = include(Pack, Place, Grid)
     info = Pack.info.im_func
     config = Pack.config.im_func
     configure = Pack.configure.im_func
     slaves = Pack.slaves.im_func
     forget = Pack.forget.im_func
     propagate = Pack.propagate.im_func

My question is:

Why use

     info = Pack.info.im_func

instead of

     info = Pack.info

?

Any and all enlightenment appreciated!

~Ethan~


From philip at semanchuk.com  Sat Mar 27 09:26:40 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Sat, 27 Mar 2010 09:26:40 -0400
Subject: Classes as namespaces?
In-Reply-To: <20100327120458.GB22246@sdf.lonestar.org>
References: <hoihgt$p6t$1@reader1.panix.com>
	<20100327120458.GB22246@sdf.lonestar.org>
Message-ID: <A8DB1626-E510-41D1-B602-66BD0C870600@semanchuk.com>


On Mar 27, 2010, at 8:04 AM, J. Clifford Dyer wrote:

> On Fri, Mar 26, 2010 at 02:49:02PM +0000, kj wrote regarding Classes  
> as namespaces?:
>>
>> What's the word on using "classes as namespaces"?  E.g.
>>
>> class _cfg(object):
>>    spam = 1
>>    jambon = 3
>>    huevos = 2
>>
>> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
>>
>>
>> Granted, this is not the "intended use" for classes, and therefore
>> could be viewed as a misuse ("that's what dictionaries are for",
>> etc.).  But other than this somewhat academic objection[*], I really
>> can see no problem with using classes in this way.
>>
>> And yet, I've come across online murky warnings against using
>> classes as "pseudo-namespaces".  Is there some problem that I'm
>> not seeing with this technique?
>>
>> ~K
>
> I don't see anything wrong with this, except that I would clean it  
> up in a couple ways.  Like other posters, I would give the class a  
> proper class name (Cfg).
>
> I also would not assign integers to spam, jambon, or huevos.   
> Instead I would assign each a bare object().  That way you won't get  
> unexpected interactions with other constants outside the class.  An  
> object() is equal only to itself.

What I like about this method is that it will break the bad habit I  
see in junior programmers of making assumptions about the value of the  
constant. For instance, if they see that Cfg.JAMBON = 3 and hardcode 3  
in their code somewhere, that will work fine until someone re-orders  
the constants. Using object() instead forces them to use Cfg.JAMBON  
since the value will (probably) change with every run of the program.

It will also discourage bugs-waiting-to-happen like this:
if breakfast > Cfg.SPAM:
     print "Good news, breakfast is jambon or huevos"



bye
P




From ethan at stoneleaf.us  Sat Mar 27 09:34:45 2010
From: ethan at stoneleaf.us (Ethan Furman)
Date: Sat, 27 Mar 2010 06:34:45 -0700
Subject: Classes as namespaces?
In-Reply-To: <52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
References: <hoihgt$p6t$1@reader1.panix.com>	<69463be0-d839-43cf-a8a7-1cc9081f672d@r27g2000yqn.googlegroups.com>
	<52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
Message-ID: <4BAE0975.1090004@stoneleaf.us>

Jonathan Hartley wrote:
> Hey everyone. By coincidence, only yesterday I was wondering about
> using classes as a way of labeling a block of code, ie. an lightweight
> alternative to defining a function that would only be called from one
> location.
> 
> eg. instead of:
> 
> 
> x = 1
> ((some complex logic))
> y = 2
> 
> 
> one might like to name the complex block of logic, just to make it
> readable:
> 
> 
> x = 1
> def account_for_non_square_pixels(x):
>    ((some complex logic))
> account_for_non_square_pixels()
> y = 2
> 
> 
> But defining and then calling the function like that is a tad
> cumbersome. So I was wondering about:
> 
> 
> 
> x = 1
> class account_for_non_square_pixels:
>   ((some complex logic))
> y = 2
> 
> 
> I don't exactly like this, but I think you can see what I'm getting
> at. Does this fall down in some way I haven't grasped? Is it as awful
> an abuse of 'class' as my intuition suggests it is? Is there a way to
> do it better?

Both solutions look horrible to me, as both hurt readability.  Make your 
function somewhere else, then call it in the code.  Who cares if you 
only use it once?

x = 1
account_for_non_square_pixels()
y = 2

Isn't that easier to read?

And when you want to (read/change) the complex code, you have an easy 
place to go to do it.

~Ethan~


From jmheralds at gmail.com  Sat Mar 27 09:37:26 2010
From: jmheralds at gmail.com (James Heralds)
Date: Sat, 27 Mar 2010 06:37:26 -0700 (PDT)
Subject: Call for papers (Deadline Extended): SETP-10, USA, July 2010
Message-ID: <ce916d05-f4c8-484e-84c5-bd8a8c9c53f9@j21g2000yqh.googlegroups.com>

It would be highly appreciated if you could share this announcement
with your colleagues, students and individuals whose research is in
software engineering, software testing, software quality assurance,
software design and related areas.

Call for papers (Deadline Extended): SETP-10, USA, July 2010

The 2010 International Conference on Software Engineering Theory and
Practice (SETP-10) (website: http://www.PromoteResearch.org ) will be
held during 12-14 of July 2010 in Orlando, FL, USA.  SETP is an
important event in the areas of Software development, maintenance, and
other areas of software engineering and related topics.

The conference will be held at the same time and location where
several other major international conferences will be taking place.
The conference will be held as part of 2010 multi-conference
(MULTICONF-10). MULTICONF-10 will be held during July 12-14, 2010 in
Orlando, Florida, USA. The primary goal of MULTICONF is to promote
research and developmental activities in computer science, information
technology, control engineering, and related fields. Another goal is
to promote the dissemination of research to a multidisciplinary
audience and to facilitate communication among researchers,
developers, practitioners in different fields. The following
conferences are planned to be organized as part of MULTICONF-10.

?	International Conference on Artificial Intelligence and Pattern
Recognition (AIPR-10)
?	 International Conference on Automation, Robotics and Control
Systems (ARCS-10)
?	International Conference on Bioinformatics, Computational Biology,
Genomics and Chemoinformatics (BCBGC-10)
?	International Conference on Computer Communications and Networks
(CCN-10)
?	International Conference on Enterprise Information Systems and Web
Technologies (EISWT-10)
?	International Conference on High Performance Computing Systems
(HPCS-10)
?	International Conference on Information Security and Privacy
(ISP-10)
?	International Conference on Image and Video Processing and Computer
Vision (IVPCV-10)
?	International Conference on Software Engineering Theory and Practice
(SETP-10)
?	International Conference on Theoretical and Mathematical Foundations
of Computer Science (TMFCS-10)

MULTICONF-10 will be held at Imperial Swan Hotel and Suites.  It is a
full-service resort that puts you in the middle of the fun! Located
1/2 block south of the famed International Drive, the hotel is just
minutes from great entertainment like Walt Disney World? Resort,
Universal Studios and Sea World Orlando. Guests can enjoy free
scheduled transportation to these theme parks, as well as spacious
accommodations, outdoor pools and on-site dining ? all situated on 10
tropically landscaped acres. Here, guests can experience a full-
service resort with discount hotel pricing in Orlando.


We invite draft paper submissions. Please see the website
http://www.PromoteResearch.org  for more details.

Sincerely
James Heralds


From invalid at invalid.invalid  Sat Mar 27 10:44:23 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Sat, 27 Mar 2010 14:44:23 +0000 (UTC)
Subject: Any examples/documentation for python-newt
References: <hokorf$21qc$4@news.telesweet.net>
Message-ID: <hol5k7$dre$1@reader1.panix.com>

On 2010-03-27, Harishankar <v.harishankar at gmail.com> wrote:
> I am writing a fairly featureful TUI in python and I figured newt is the 
> best lightweight TUI which actually offers widgets. curses is low level 
> and its text editing capabilities are poor while UIs like urwid and stfl 
> too complex for simple programs like the ones I am creating.
>
> Could anybody point me to at least a decent example program in newt/snack 
> and I don't mean popcorn.py or peanuts.py. Something that at least shows 
> how to create a basic menu-driven program in the command line with a main 
> menu and implementing several sub menus. Also a bit of explanation of the 
> behaviour of OK and Cancel buttons in standard forms would be of help.
>
> So anybody uses newt? Or have people stopped using text based UIs 
> completely?

I've used it for some trivial stuff, but not for anything very
sophisticated.  Redhat's text-mode installer program (anaconda) was
written in Python using Newt (I believe it is why Newt was invented).
That's probably the most "full featured" example I know of.

-- 
Grant


From v.harishankar at gmail.com  Sat Mar 27 10:49:37 2010
From: v.harishankar at gmail.com (Harishankar)
Date: Sat, 27 Mar 2010 14:49:37 +0000 (UTC)
Subject: Any examples/documentation for python-newt
References: <hokorf$21qc$4@news.telesweet.net> <hol5k7$dre$1@reader1.panix.com>
Message-ID: <hol5u1$2t9h$1@news.telesweet.net>

On Sat, 27 Mar 2010 14:44:23 +0000, Grant Edwards wrote:

> On 2010-03-27, Harishankar <v.harishankar at gmail.com> wrote:
>> I am writing a fairly featureful TUI in python and I figured newt is
>> the best lightweight TUI which actually offers widgets. curses is low
>> level and its text editing capabilities are poor while UIs like urwid
>> and stfl too complex for simple programs like the ones I am creating.
>>
>> Could anybody point me to at least a decent example program in
>> newt/snack and I don't mean popcorn.py or peanuts.py. Something that at
>> least shows how to create a basic menu-driven program in the command
>> line with a main menu and implementing several sub menus. Also a bit of
>> explanation of the behaviour of OK and Cancel buttons in standard forms
>> would be of help.
>>
>> So anybody uses newt? Or have people stopped using text based UIs
>> completely?
> 
> I've used it for some trivial stuff, but not for anything very
> sophisticated.  Redhat's text-mode installer program (anaconda) was
> written in Python using Newt (I believe it is why Newt was invented).
> That's probably the most "full featured" example I know of.

Does your code use forms in an application loop? I am having a bit of 
trouble with getting the form to stack up properly when I displaying 
another. As far as I know the two examples uses a single instance of a 
form which is discarded immediately on exit.

If you have even a small code sample I wouldn't mind reading it! 

-- 
-- Harishankar (http://harishankar.org http://literaryforums.org)


From invalid at invalid.invalid  Sat Mar 27 10:56:30 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Sat, 27 Mar 2010 14:56:30 +0000 (UTC)
Subject: Any examples/documentation for python-newt
References: <hokorf$21qc$4@news.telesweet.net> <hol5k7$dre$1@reader1.panix.com>
	<hol5u1$2t9h$1@news.telesweet.net>
Message-ID: <hol6au$dre$4@reader1.panix.com>

On 2010-03-27, Harishankar <v.harishankar at gmail.com> wrote:

>> I've used it for some trivial stuff, but not for anything very
>> sophisticated.  Redhat's text-mode installer program (anaconda) was
>> written in Python using Newt (I believe it is why Newt was invented).
>> That's probably the most "full featured" example I know of.
>
> Does your code use forms in an application loop?

Not really.  It uses a series of forms.  I don't think I ever stack
forms.

> I am having a bit of trouble with getting the form to stack up
> properly when I displaying another. As far as I know the two examples
> uses a single instance of a form which is discarded immediately on
> exit.

That's pretty much all my program did.

> If you have even a small code sample I wouldn't mind reading it! 

I'm afraid I'm not at liberty to post it.

-- 
Grant



From aharrisreid at googlemail.com  Sat Mar 27 11:08:09 2010
From: aharrisreid at googlemail.com (Alan Harris-Reid)
Date: Sat, 27 Mar 2010 15:08:09 +0000
Subject: Super() function
In-Reply-To: <797c8cbd1003242042s32ee16bbxe6d937a16ab35a50@mail.gmail.com>
References: <4BAAD5E0.9050604@googlemail.com>
	<797c8cbd1003242042s32ee16bbxe6d937a16ab35a50@mail.gmail.com>
Message-ID: <4BAE1F59.4070800@googlemail.com>

?p wrote:
> Hi:
>  
> On 25 March 2010 11:17, Alan Harris-Reid <aharrisreid at googlemail.com 
> <mailto:aharrisreid at googlemail.com>> wrote:
>
>     Hi,
>
>     Using Python 3.1, I sometimes use the super() function to call the
>     equivalent method from a parent class, for example
>
>     def mymethod(self):
>       super().mymethod()
>       some more code...
>
>     Is there any way of writing the code so that the super() call is
>     generic and automatically recognises the name of the current
>     method (ie. something like super().thismethod()) or do I always
>     have to repeat the method name after super()?
>
>     TIA,
>     Alan
>     -- 
>     http://mail.python.org/mailman/listinfo/python-list
>
>
>
>
>    I think, the super() method is designed to delegate any method call 
> to one of the class in its mro list, and the super() function its self 
> return a 'super' object, so it is better to write what method you want 
> to delegate, maybe it's not the current method. 
>
> -- 
> Best wishes from Ray ...
Thanks Ray - I'll stick to repeating the method name.

Regards,
Alan

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From v.harishankar at gmail.com  Sat Mar 27 11:12:57 2010
From: v.harishankar at gmail.com (Harishankar)
Date: Sat, 27 Mar 2010 15:12:57 +0000 (UTC)
Subject: Any examples/documentation for python-newt
References: <hokorf$21qc$4@news.telesweet.net>
	<hol5k7$dre$1@reader1.panix.com> <hol5u1$2t9h$1@news.telesweet.net>
	<hol6au$dre$4@reader1.panix.com>
Message-ID: <hol79o$2t9h$2@news.telesweet.net>

On Sat, 27 Mar 2010 14:56:30 +0000, Grant Edwards wrote:

> On 2010-03-27, Harishankar <v.harishankar at gmail.com> wrote:
> 
>>> I've used it for some trivial stuff, but not for anything very
>>> sophisticated.  Redhat's text-mode installer program (anaconda) was
>>> written in Python using Newt (I believe it is why Newt was invented).
>>> That's probably the most "full featured" example I know of.
>>
>> Does your code use forms in an application loop?
> 
> Not really.  It uses a series of forms.  I don't think I ever stack
> forms.
> 
>> I am having a bit of trouble with getting the form to stack up properly
>> when I displaying another. As far as I know the two examples uses a
>> single instance of a form which is discarded immediately on exit.
> 
> That's pretty much all my program did.
> 
>> If you have even a small code sample I wouldn't mind reading it!
> 
> I'm afraid I'm not at liberty to post it.

Thanks anyway. 

I'm taking a look at text.py in the anaconda source code tree here: 
http://git.fedorahosted.org/git/anaconda.git?
p=anaconda.git;a=blob_plain;f=text.py;hb=HEAD

I'm afraid it looks as though newt was primarily built to display a 
series of forms in order, like an installer does, so it is inherently 
limited by that interface. However, it might still be what I can use...

-- 
Harishankar (http://harishankar.org http://literaryforums.org)


From alain at dpt-info.u-strasbg.fr  Sat Mar 27 11:17:46 2010
From: alain at dpt-info.u-strasbg.fr (Alain Ketterlin)
Date: Sat, 27 Mar 2010 16:17:46 +0100
Subject: GIF89A and PIL
References: <2010032618455468300-aptshansen@gmailinvalid>
Message-ID: <87oci9hjz9.fsf@dpt-info.u-strasbg.fr>

Stephen Hansen <apt.shansen at gmail.invalid> writes:

> Is it possible to get PIL to save GIF's in GIF89A format, instead of
> GIF87A?

GIF89 was patented. I guess that is why it isn't used by PIL. (The
patent has expired now, IIRC.) Anyway, PNG was supposed to replace GIF.

> If not, are there any decent other image libraries out there
> that anyone's familiar with? The only one I could find was
> PythonMagick, which seems completely undocumented. Or I'm blind.

I don't know PythonMagick, but it is based on ImageMagick, which is kind
of a swiss-knife in image manipulation and conversion. You could try the
standalone tools first, to see if you get what you want/need.

> But the problem is, I have a nice, small little 72 byte GIF89A file,
> that I want to do some slight tweaking on and then re-save. I noticed
> that even if I completely skipped the tweaking step and -just- saved,
> it exploded into a 919 byte GIF87A file. And in this context, bytes
> really, really matter. I picked GIF over PNG because the same file in
> PNG was 120 bytes :)
[...]
>>>> f = open('../tiles/BaseTemplate.gif', 'rb')
>>>> d1 = f.read()
>>>> len(d1)
> 73
>>>> d1
> 'GIF89a\x10\x00\x10\x00[...]'

Hmm, a 16x16 image. Don't expect much from the most sophisticated
formats (e.g, PNG), because their overhead (headers etc.) may well be
above the size of the data. Compression isn't usually targeted at small
files.

(BTW: "slight tweaking" may have an effect on file-size if it introduces
new colors, because GIF uses a color-table. I guess you know all this.)

GIF uses the LZW algorithm, and so does zip and gzip (the latter with an
additional layer of Huffmann coding). If your images are of fixed size,
you _may_ be better off compressing the raw data with a general purpose
compressor (i.e., gzip). Check the packages gzip and zlib.

-- Alain.


From vicente.soler at gmail.com  Sat Mar 27 11:24:26 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sat, 27 Mar 2010 08:24:26 -0700 (PDT)
Subject: function decorator-like function
Message-ID: <9935ff3e-ff2f-44b8-83f4-60883b1512ac@k17g2000yqb.googlegroups.com>

Hi,

Still learning Python, now decorators.

Before diving deeply into decorators, I'd like to apply a function to
another function.

My "extremely simple function" should print number 3, then the sum of
its 2 arguments.

Say that I call   f(5,7)
I'd like to get, somehow, 3 then 12.

I've tried the following:

def d(f):
    print 3
    return f

def f(a, b):
    print a+b

f=d(f)

However, it does not work. Calling f(5,7) only returns 12, (3 is
missing)
How should I proceed?


From pmaupin at gmail.com  Sat Mar 27 12:06:40 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sat, 27 Mar 2010 09:06:40 -0700 (PDT)
Subject: function decorator-like function
References: <9935ff3e-ff2f-44b8-83f4-60883b1512ac@k17g2000yqb.googlegroups.com>
Message-ID: <90fe2ae8-cf1e-4d89-8b6d-2802874e64b5@e7g2000yqf.googlegroups.com>

On Mar 27, 10:24?am, vsoler <vicente.so... at gmail.com> wrote:
> Hi,
>
> Still learning Python, now decorators.
>
> Before diving deeply into decorators, I'd like to apply a function to
> another function.
>
> My "extremely simple function" should print number 3, then the sum of
> its 2 arguments.
>
> Say that I call ? f(5,7)
> I'd like to get, somehow, 3 then 12.
>
> I've tried the following:
>
> def d(f):
> ? ? print 3
> ? ? return f
>
> def f(a, b):
> ? ? print a+b
>
> f=d(f)
>
> However, it does not work. Calling f(5,7) only returns 12, (3 is
> missing)
> How should I proceed?

>>> def d(f):
...     def wrapper(*args):
...         print 3
...         return f(*args)
...     return wrapper
...
>>> def f(a, b):
...     print a + b
...
>>> f = d(f)
>>> f(5, 7)
3
12

HTH,
Pat


From lkizer at cfl.rr.com  Sat Mar 27 12:21:02 2010
From: lkizer at cfl.rr.com (Larry Kizer)
Date: Sat, 27 Mar 2010 12:21:02 -0400
Subject: Ipython(x,y) Won't Run
Message-ID: <4bae3040$0$5117$9a6e19ea@unlimited.newshosting.com>

I uninstalled my previous version of Python and installed Python(x,y)
ver 2.6.2.0 in Windows XP - Install seemed to work fine but when I try to 
run
Ipython(x,y) I get the following error: python.exe has encountered a
problem and needs to close.  We are sorry for the inconvenience.
Any ideas? Thanks.

LK 




From vicente.soler at gmail.com  Sat Mar 27 12:21:06 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sat, 27 Mar 2010 09:21:06 -0700 (PDT)
Subject: function decorator-like function
References: <9935ff3e-ff2f-44b8-83f4-60883b1512ac@k17g2000yqb.googlegroups.com>
	<90fe2ae8-cf1e-4d89-8b6d-2802874e64b5@e7g2000yqf.googlegroups.com>
Message-ID: <c32492f2-3c6c-48a1-9dd4-f7faeed21347@k17g2000yqb.googlegroups.com>

On 27 mar, 17:06, Patrick Maupin <pmau... at gmail.com> wrote:
> On Mar 27, 10:24?am, vsoler <vicente.so... at gmail.com> wrote:
>
>
>
> > Hi,
>
> > Still learning Python, now decorators.
>
> > Before diving deeply into decorators, I'd like to apply a function to
> > another function.
>
> > My "extremely simple function" should print number 3, then the sum of
> > its 2 arguments.
>
> > Say that I call ? f(5,7)
> > I'd like to get, somehow, 3 then 12.
>
> > I've tried the following:
>
> > def d(f):
> > ? ? print 3
> > ? ? return f
>
> > def f(a, b):
> > ? ? print a+b
>
> > f=d(f)
>
> > However, it does not work. Calling f(5,7) only returns 12, (3 is
> > missing)
> > How should I proceed?
> >>> def d(f):
>
> ... ? ? def wrapper(*args):
> ... ? ? ? ? print 3
> ... ? ? ? ? return f(*args)
> ... ? ? return wrapper
> ...>>> def f(a, b):
>
> ... ? ? print a + b
> ...>>> f = d(f)
> >>> f(5, 7)
>
> 3
> 12
>
> HTH,
> Pat

Pat,

I think some lines are missing. I don't see "d" function defined. Any
lines above def wrapper?

Thank you


From vicente.soler at gmail.com  Sat Mar 27 12:24:51 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sat, 27 Mar 2010 09:24:51 -0700 (PDT)
Subject: function decorator-like function
References: <9935ff3e-ff2f-44b8-83f4-60883b1512ac@k17g2000yqb.googlegroups.com>
	<90fe2ae8-cf1e-4d89-8b6d-2802874e64b5@e7g2000yqf.googlegroups.com> 
	<c32492f2-3c6c-48a1-9dd4-f7faeed21347@k17g2000yqb.googlegroups.com>
Message-ID: <b7dd0538-7300-476c-adfe-8b18b9f1bf9c@g4g2000yqa.googlegroups.com>

On 27 mar, 17:21, vsoler <vicente.so... at gmail.com> wrote:
> On 27 mar, 17:06, Patrick Maupin <pmau... at gmail.com> wrote:
>
>
>
> > On Mar 27, 10:24?am, vsoler <vicente.so... at gmail.com> wrote:
>
> > > Hi,
>
> > > Still learning Python, now decorators.
>
> > > Before diving deeply into decorators, I'd like to apply a function to
> > > another function.
>
> > > My "extremely simple function" should print number 3, then the sum of
> > > its 2 arguments.
>
> > > Say that I call ? f(5,7)
> > > I'd like to get, somehow, 3 then 12.
>
> > > I've tried the following:
>
> > > def d(f):
> > > ? ? print 3
> > > ? ? return f
>
> > > def f(a, b):
> > > ? ? print a+b
>
> > > f=d(f)
>
> > > However, it does not work. Calling f(5,7) only returns 12, (3 is
> > > missing)
> > > How should I proceed?
> > >>> def d(f):
>
> > ... ? ? def wrapper(*args):
> > ... ? ? ? ? print 3
> > ... ? ? ? ? return f(*args)
> > ... ? ? return wrapper
> > ...>>> def f(a, b):
>
> > ... ? ? print a + b
> > ...>>> f = d(f)
> > >>> f(5, 7)
>
> > 3
> > 12
>
> > HTH,
> > Pat
>
> Pat,
>
> I think some lines are missing. I don't see "d" function defined. Any
> lines above def wrapper?
>
> Thank you

Patrick,

I see what happened. The first line was somehow hidden.
Thank you very much.

Vicente Soler


From aharrisreid at googlemail.com  Sat Mar 27 12:43:11 2010
From: aharrisreid at googlemail.com (Alan Harris-Reid)
Date: Sat, 27 Mar 2010 16:43:11 +0000
Subject: Super() function
In-Reply-To: <op.u93uq1jyx6zn5v@gabriel.sleipnir-bsas>
References: <4BAAD5E0.9050604@googlemail.com>
	<op.u93uq1jyx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <4BAE359F.6090200@googlemail.com>

Gabriel Genellina wrote:
> <div class="moz-text-flowed">En Thu, 25 Mar 2010 00:17:52 -0300, Alan 
> Harris-Reid <aharrisreid at googlemail.com> escribi?:
>
>> Using Python 3.1, I sometimes use the super() function to call the 
>> equivalent method from a parent class, for example
>>
>> def mymethod(self):
>>     super().mymethod()
>>     some more code...
>>
>> Is there any way of writing the code so that the super() call is 
>> generic and automatically recognises the name of the current method 
>> (ie. something like super().thismethod()) or do I always have to 
>> repeat the method name after super()?
>
> This recipe does what you want:
> http://code.activestate.com/recipes/286195-selfsuper/
> (but requires a bit of black magic...)
>
Hi Gabriel - thanks for the reply.

Goodness me - that's a mighty complicated recipe for what I want to 
achieve!  I think I'll stick with repeating the method name - it's a 
small price to pay.

Regards,
Alan


From james.harris.1 at googlemail.com  Sat Mar 27 13:01:34 2010
From: james.harris.1 at googlemail.com (James Harris)
Date: Sat, 27 Mar 2010 10:01:34 -0700 (PDT)
Subject: Python database of plain text editable by notepad or vi
References: <93d7991f-d688-4692-b34f-2fa571cebbdf@q15g2000yqj.googlegroups.com>
	<46822448-2984-4ef6-85c7-bef834e2e86c@r1g2000yqj.googlegroups.com> 
	<3d897b92-9def-4339-ac19-b06b5fb9705e@e6g2000yqh.googlegroups.com> 
	<a62686e9-5b8e-4c24-a092-b95554b9536e@30g2000yqi.googlegroups.com>
Message-ID: <929d4c9a-ec2d-4b21-ac10-9ae099c040b0@q21g2000yqm.googlegroups.com>

On 26 Mar, 14:58, Jon Clements <jon... at googlemail.com> wrote:
> On 26 Mar, 09:49, James Harris <james.harri... at googlemail.com> wrote:
...
> > I'm toying with some
> > ideas for a way to help generate source code (in various languages,
> > not just Python). If it goes ahead the text files would be mainly
> > marked-up code snippets - with or without symbols that need to be
> > replaced.
>
> > Rather than write one single monolithic app I thought to split it into
> > reusable components. One part being data access could perhaps be an
> > existing database (and I'll take a look at jkn's suggestion).
>
> > Think of the database as similar to an associative array stored on
> > disk. The only difference is I may want to play fast and loose with
> > the keys in some ways - e.g. check for partial key matches or return a
> > list of part-matched keys. The language name could be part of the key
> > but I'd also need to store variants for specific language versions.
> > I'm not sure yet how it will all pan out. As I say, just throwing
> > around some ideas.
...
> Thanks for the explanation.

No problem. Thanks for taking an interest!

> Who admins and, who's editing this data?

For the app I have in mind a programmer would admin and edit the
files.

> I couldn't 100% guarantee that I could modify a text file and always
> put the right
> delimiter in the right place and remember to escape the relevant chars
> (and I'm
> probably not the 'average' user).

Apart from any markup each file would be just source code or, maybe,
individual fragments of source code so there would be few delimiters
to get right. And any that were wrong could be detected either by the
code writer or the compiler when used.

> Any opposition to just putting it in a 'proper' DB, then 'blobbing'
> the values?
> (or just integrate a procedure/script/function whatever your chosen
> RDBMS calls to choose it).
> Or in some systems, 'externally referencing'... loads of DB's have
> free front-ends,
> and there are lots of Python libraries.

I've thought of that. Like Ethan, though, I'd prefer simple text for
this. Databases, for good reasons, tend to obscure text. For one thing
it makes them more secure but it also makes them less transparent and
harder to examine and edit. For this app simple text files seem to be
the best option at the moment.

>
> I think perhaps, all I'm saying is, I'd choose a different approach.
> I'd provide a front-end, rather than choose to re-write the wheel over
> DB's.

Agreed. That was my reason for asking the question initially.

> Be nice to know how you get on, if you'd be so kind?

I don't know yet if it will be feasible but if I do eventually write
something I'll report back.

James


From tjreedy at udel.edu  Sat Mar 27 13:10:22 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 27 Mar 2010 13:10:22 -0400
Subject: Classes as namespaces?
In-Reply-To: <52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
References: <hoihgt$p6t$1@reader1.panix.com>	<69463be0-d839-43cf-a8a7-1cc9081f672d@r27g2000yqn.googlegroups.com>
	<52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
Message-ID: <hole5s$tc5$1@dough.gmane.org>

On 3/27/2010 7:28 AM, Jonathan Hartley wrote:
> On Mar 26, 6:26 pm, Luis M. Gonz?lez<luis... at gmail.com>  wrote:

> But defining and then calling the function like that is a tad
> cumbersome. So I was wondering about:
>
>
>
> x = 1
> class account_for_non_square_pixels:
>    ((some complex logic))
> y = 2
>
>
> I don't exactly like this, but I think you can see what I'm getting
> at. Does this fall down in some way I haven't grasped?

The assignments within the class are performed within a new local 
namespace. So moving non-toy code within a class block will typically fail.




From pmaupin at gmail.com  Sat Mar 27 14:07:47 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sat, 27 Mar 2010 11:07:47 -0700 (PDT)
Subject: function decorator-like function
References: <9935ff3e-ff2f-44b8-83f4-60883b1512ac@k17g2000yqb.googlegroups.com>
	<90fe2ae8-cf1e-4d89-8b6d-2802874e64b5@e7g2000yqf.googlegroups.com> 
	<c32492f2-3c6c-48a1-9dd4-f7faeed21347@k17g2000yqb.googlegroups.com> 
	<b7dd0538-7300-476c-adfe-8b18b9f1bf9c@g4g2000yqa.googlegroups.com>
Message-ID: <40ba11d3-5a18-4da4-a48a-0dd815f3b459@35g2000yqm.googlegroups.com>

On Mar 27, 11:24?am, vsoler <vicente.so... at gmail.com> wrote:
> I see what happened. The first line was somehow hidden.
> Thank you very much.

You're welcome.  Sorry about the formatting.  Also, note that if your
decorator is complicated, you might want to use a class instead of a
nested function.  Here's the same thing, using a class (and using the
actual decorator syntax):

class d(object):
    def __init__(self, func):
        self.func = func
    def __call__(self, *args):
        print 3
        return self.func(*args)

@d
def f(a, b):
    print a + b

f(5, 7)

Pat


From pmaupin at gmail.com  Sat Mar 27 14:22:09 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sat, 27 Mar 2010 11:22:09 -0700 (PDT)
Subject: Classes as namespaces?
References: <hoihgt$p6t$1@reader1.panix.com>
	<69463be0-d839-43cf-a8a7-1cc9081f672d@r27g2000yqn.googlegroups.com>
	<52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com> 
	<mailman.1259.1269709837.23598.python-list@python.org>
Message-ID: <8db24743-f293-4f87-b2fa-d86291de2f86@j21g2000yqh.googlegroups.com>

On Mar 27, 12:10?pm, Terry Reedy <tjre... at udel.edu> wrote:
> On 3/27/2010 7:28 AM, Jonathan Hartley wrote:
>
> > On Mar 26, 6:26 pm, Luis M. Gonz?lez<luis... at gmail.com> ?wrote:
> > But defining and then calling the function like that is a tad
> > cumbersome. So I was wondering about:
>
> > x = 1
> > class account_for_non_square_pixels:
> > ? ?((some complex logic))
> > y = 2
> The assignments within the class are performed within
> a new local namespace.

I could be misunderstanding, but I think that may be the point.  When
you have what is basically a bunch of linear logic in Python,
sometimes it makes sense to break the logic up into separate
namespaces, such that you don't pollute the global namespace too badly
(which could cause obscure failures due to inadvertently reusing a
variable name which is not properly initialized on the second use).

As the OP mentioned, functions are typically used for this, but then
you have to decide if you are going to put all your functions above
all the rest of the code, or in-line, which is where they belong
according to the flow.  Either decision has drawbacks -- it is jarring
to see functions defined in the middle of a code flow, but it requires
extra work to page up and down to see code that is logically in the
middle of a code flow, but has been moved out to a sub-function
somewhere.

> So moving non-toy code within a class block
> will typically fail.

I think, as with moving non-toy code into a function, the point may be
to *force* (more obvious) failures when something is screwed up,
rather than allowing the silent failures that can easily occur with a
large number of only marginally related variables in one big
namespace.

I have done what (I think) the OP is suggesting in the distant past.
I don't know why I don't do it any more -- perhaps it is more of a
comfort thing, or maybe I have gotten better at choosing the right
abstraction points for the function boundaries so that I don't always
need to read the function code when I am reading the code that invokes
it.  But in any case, I don't personally think that:

a = 27
b = 30

class DoMoreComputation:
    c = a + b

d = DoMoreComputation.c

is a terrible, ugly thing, although it is not my current preference.

Regards,
Pat


From andrej.mitrovich at gmail.com  Sat Mar 27 15:29:39 2010
From: andrej.mitrovich at gmail.com (Andrej Mitrovic)
Date: Sat, 27 Mar 2010 12:29:39 -0700 (PDT)
Subject: Vertical line in function arguments
Message-ID: <3d96ca83-7741-483d-8449-d88dc0f445b7@y17g2000yqd.googlegroups.com>

There is this peace of code in a 3rd party module:

MidiIn.SetFilter(pypm.FILT_ACTIVE | pypm.FILT_CLOCK |
pypm.FILT_PITCHBEND |
                     pypm.FILT_NOTE)

What are the vertical lines in a function call such as this? This
actually calls a function from a Pyrex module that was compiled into
a .pyd. Those filters are hex constants, but I've no idea what these
vertical lines mean. Is this some form of binary "or" operation?


From andrej.mitrovich at gmail.com  Sat Mar 27 15:30:53 2010
From: andrej.mitrovich at gmail.com (Andrej Mitrovic)
Date: Sat, 27 Mar 2010 12:30:53 -0700 (PDT)
Subject: Vertical line in function arguments
References: <3d96ca83-7741-483d-8449-d88dc0f445b7@y17g2000yqd.googlegroups.com>
Message-ID: <150eb50d-6117-426b-a014-e6b1662a867e@19g2000yqu.googlegroups.com>

Well I hate it when this happens. I ask a question, and literally 2
seconds later I bump into the answer.

This explains it a bit: http://docs.python.org/library/stdtypes.html#bit-string-operations-on-integer-types


From lie.1296 at gmail.com  Sat Mar 27 15:48:21 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 28 Mar 2010 06:48:21 +1100
Subject: StringChain -- a data structure for managing large sequences
	of chunks of bytes
In-Reply-To: <pan.2010.03.22.08.07.48@REMOVE.THIS.cybersource.com.au>
References: <mailman.646.1268377905.23598.python-list@python.org>	<4b9a00ce$0$27822$c3e8da3@news.astraweb.com>	<mailman.1055.1269234593.23598.python-list@python.org>
	<pan.2010.03.22.08.07.48@REMOVE.THIS.cybersource.com.au>
Message-ID: <4bae6130$1@dnews.tpgi.com.au>

On 03/22/2010 07:07 PM, Steven D'Aprano wrote:
> Perhaps you should have said that it was a wrapper around deque giving 
> richer functionality, rather than giving the impression that it was a 
> brand new data structure invented by you. People are naturally going to 
> be more skeptical about a newly invented data structure than one based on 
> a reliable, component like deque.

Well, technically StringChain is not a data structure in the first
place. StringChain is a string; a string that is implemented using deque
data structure to make appending algorithmically efficient. It is not a
data structure, in the sense that I can't put arbitrary "thing" into the
data structure. In the same sense, "string" is also not a data structure
as "string" is an implementation of stream using "array" data structure;
"StringChain" is an implementation of stream using "deque" data structure.


From jenjenmu at gmail.com  Sat Mar 27 17:14:31 2010
From: jenjenmu at gmail.com (knobbyknees)
Date: Sat, 27 Mar 2010 14:14:31 -0700 (PDT)
Subject: Python Psycopg2 - Interface Error : Connection already closed
Message-ID: <c1879e24-b76f-49bb-b7cb-0b7c8274044d@f14g2000pre.googlegroups.com>

I'm not sure if this is the right group, but I'm hoping it is...

Basically, I'm trying to use pgloader, which depends on python and
psycopg2.  After banging my head against a wall, I found this:

Found this:
http://www.mail-archive.com/sqlalchemy at googlegroups.com/msg13209.html

Although, the suggestion didn't work for me at all...

Running this command:
/usr/bin/pgloader -c /var/mybin/pgconfs/fr.conf

Yields this in the pgloader.log (with the process just hanging)

more /tmp/pgloader.log
27-03-2010 12:22:53 pgloader     INFO     Logger initialized
27-03-2010 12:22:53 pgloader     INFO     Reformat path is ['/usr/
share/python-support/pgloader/reformat']
27-03-2010 12:22:53 pgloader     INFO     Will consider following
sections:
27-03-2010 12:22:53 pgloader     INFO       fixed
27-03-2010 12:22:54 fixed        INFO     fixed processing
27-03-2010 12:22:54 pgloader     INFO     All threads are started,
wait for them to terminate
27-03-2010 12:22:57 fixed        ERROR    connection already closed
27-03-2010 12:22:57 fixed        INFO     closing current database
connection

[pgsql]
host                  = localhost
port                  = 5432
base                  = frdb
user                  = username
pass                  = password


[fixed]
table                 = fr
format                = fixed
filename              = /var/www/fr.txt
...


This is what I see for the traceback:
Traceback (most recent call last):
  File "/usr/lib/python2.6/threading.py", line 525, in
__bootstrap_inner
    self.run()
  File "/usr/lib/pymodules/python2.6/pgloader/pgloader.py", line 847,
in run
    self.terminate()
  File "/usr/lib/pymodules/python2.6/pgloader/pgloader.py", line 874,
in terminate
    self.db.close()
  File "/usr/lib/pymodules/python2.6/pgloader/db.py", line 103, in
close
    self.dbconn.close()


I'm at a total loss here....  Can anyone please help me out?


From nocbos at gmail.com  Sat Mar 27 18:39:23 2010
From: nocbos at gmail.com (C. B.)
Date: Sat, 27 Mar 2010 15:39:23 -0700 (PDT)
Subject: Automatic import ?
References: <4d167b6b-04fb-42bb-9c21-ab66d0fb4367@k17g2000yqb.googlegroups.com>
	<mailman.1214.1269606975.23598.python-list@python.org>
	<f4f7a234-e1c4-4f5c-8b0b-a089cafa7607@h18g2000yqo.googlegroups.com>
	<mailman.1252.1269693746.23598.python-list@python.org>
Message-ID: <23f6145e-c44d-4d37-8e5e-a98636d4d452@i25g2000yqm.googlegroups.com>


> In that particular case, replace automatic by implicit, and you got the
> reason why it is not a good idea.
> Maybe in your case the C habits clashes to the python habits.
>

You're right !

As a C developer, I appreciate to only include <string.h> to deal with
strings, without wondering which other header provides size_t
definition.

> Talking about python, if the user needs to know about BBB, then it has
> to import it, perdiod. If the user needs to know about many objects,
> then it has to import them all, explicitly.

Ok. If this is the Python way of coding, that's ok for me. I will stop
now my quest for an automatic import and work like that.

The most interesting solution I have found until now is using
PyImport_AppendInittab() and PyEval_GetGlobals() functions. But this
also brings lots of problems (mainly namespaces and unloading).
Anyway, the time spent to look for a solution was a nice way to learn
Python internals :)

Cheers,


From saimapk81 at gmail.com  Sat Mar 27 18:51:43 2010
From: saimapk81 at gmail.com (saima81)
Date: Sat, 27 Mar 2010 15:51:43 -0700 (PDT)
Subject: "jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
	citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
	manager" 
	"usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
Message-ID: <7fce4205-a64f-46dd-8066-cdfd45400183@a16g2000pre.googlegroups.com>

"jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
manager" "usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
"jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
manager" "usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
"jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
manager" "usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
"jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
manager" "usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
"jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
manager" "usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
"jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
manager" "usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
"jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
manager" "usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
"jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
manager" "usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
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citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
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citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
manager" "usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
"jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
manager" "usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
"jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
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citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
manager" "usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
"jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
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citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
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citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
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citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
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manager" "usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
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citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
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From greg.ewing at canterbury.ac.nz  Sat Mar 27 18:56:21 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sun, 28 Mar 2010 10:56:21 +1200
Subject: Classes as namespaces?
In-Reply-To: <52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
References: <hoihgt$p6t$1@reader1.panix.com>
	<69463be0-d839-43cf-a8a7-1cc9081f672d@r27g2000yqn.googlegroups.com>
	<52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
Message-ID: <817g5kFb3mU1@mid.individual.net>

Jonathan Hartley wrote:

> def account_for_non_square_pixels(x):
>    ((some complex logic))
> account_for_non_square_pixels()

> class account_for_non_square_pixels:
>   ((some complex logic))

I don't see much advantage -- you're still leaving behind an
object that won't be used again.

If you're concerned about namespace pollution, there are a
couple of ways to clean it up:

1) Delete the function after using it:

   def account_for_non_square_pixels(x):
      ...
   account_for_non_square_pixels()
   del account_for_non_square_pixels

2) Use __all__ to specify which names you intend to export
(doesn't prevent anyone from importing something explicitly,
but at least it makes your intention clear, stops irrelevant
things appearing in dir() or help(), etc).

-- 
Greg


From greg.ewing at canterbury.ac.nz  Sat Mar 27 19:40:07 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sun, 28 Mar 2010 11:40:07 +1200
Subject: Classes as namespaces?
In-Reply-To: <hoihgt$p6t$1@reader1.panix.com>
References: <hoihgt$p6t$1@reader1.panix.com>
Message-ID: <817inlFoj9U1@mid.individual.net>

kj wrote:
> What's the word on using "classes as namespaces"?

My only concern would be that classes do magical things with certain
types when you retrieve them as attributes (e.g. functions, property
descriptors), so you can't use one as a completely general purpose
transparent container. But for enum constants and the like this
isn't a problem.

If you're up for a bit of hackery, the following code tricks the
class statement into producing a module instead of a class:

from types import ModuleType

class MetaNamespace(ModuleType):

   def __init__(self, name, bases, dict):
     ModuleType.__init__(self, name)
     self.__file__ = __file__
     self.__dict__.update(dict)

Namespace = MetaNamespace.__new__(MetaNamespace)

class Foo(Namespace):

   ford = 42
   arthur = 88

print Foo
print Foo.__dict__

-- 
Greg


From robert.kern at gmail.com  Sat Mar 27 20:23:51 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Sat, 27 Mar 2010 19:23:51 -0500
Subject: Simple Traits Questions
In-Reply-To: <4BAE05C6.4070601@stoneleaf.us>
References: <4BAE05C6.4070601@stoneleaf.us>
Message-ID: <hom7jl$a75$1@dough.gmane.org>

On 2010-03-27 08:19 , Ethan Furman wrote:
> Okay, different post for my actual questions.  :)
>
> On the PyPI page for strait (http://pypi.python.org/pypi/strait/0.5.1)
> it has the example of choosing which methods to keep in the composed class:
>
> class TOSWidget(BaseWidget):
> __metaclass__ = include(Pack, Place, Grid)
> info = Pack.info.im_func
> config = Pack.config.im_func
> configure = Pack.configure.im_func
> slaves = Pack.slaves.im_func
> forget = Pack.forget.im_func
> propagate = Pack.propagate.im_func
>
> My question is:
>
> Why use
>
> info = Pack.info.im_func
>
> instead of
>
> info = Pack.info
>
> ?

Pack.info is an unbound method object attached to the Pack class, not a function 
object. It has some extra semantics on top of functions and is tied to the Pack 
class. The .im_func attribute gets the actual function object underneath. When 
defining the TOSWidget class, the objects defined in the suite under the class: 
statement need to be actual functions in order to be turned into unbound methods 
attached to the TOSWidget class.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From robert.kern at gmail.com  Sat Mar 27 20:25:23 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Sat, 27 Mar 2010 19:25:23 -0500
Subject: Ipython(x,y) Won't Run
In-Reply-To: <4bae3040$0$5117$9a6e19ea@unlimited.newshosting.com>
References: <4bae3040$0$5117$9a6e19ea@unlimited.newshosting.com>
Message-ID: <hom7mh$a75$2@dough.gmane.org>

On 2010-03-27 11:21 , Larry Kizer wrote:
> I uninstalled my previous version of Python and installed Python(x,y)
> ver 2.6.2.0 in Windows XP - Install seemed to work fine but when I try to
> run
> Ipython(x,y) I get the following error: python.exe has encountered a
> problem and needs to close.  We are sorry for the inconvenience.
> Any ideas? Thanks.

You will want to report Python(x,y) bugs here:

   http://www.pythonxy.com/

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From apt.shansen at gmail.invalid  Sat Mar 27 22:44:54 2010
From: apt.shansen at gmail.invalid (Stephen Hansen)
Date: Sat, 27 Mar 2010 19:44:54 -0700
Subject: GIF89A and PIL
References: <2010032618455468300-aptshansen@gmailinvalid>
	<87oci9hjz9.fsf@dpt-info.u-strasbg.fr>
Message-ID: <2010032719445464825-aptshansen@gmailinvalid>

On 2010-03-27 08:17:46 -0700, Alain Ketterlin said:

> Stephen Hansen <apt.shansen at gmail.invalid> writes:

>> If not, are there any decent other image libraries out there
>> that anyone's familiar with? The only one I could find was
>> PythonMagick, which seems completely undocumented. Or I'm blind.
> 
> I don't know PythonMagick, but it is based on ImageMagick, which is kind
> of a swiss-knife in image manipulation and conversion. You could try the
> standalone tools first, to see if you get what you want/need.

Well, I know it -can- do what I need, except the subprocess business 
isn't something I want to deal with. And the library seems utterly 
undocumented. :(

> Hmm, a 16x16 image. Don't expect much from the most sophisticated
> formats (e.g, PNG), because their overhead (headers etc.) may well be
> above the size of the data. Compression isn't usually targeted at small
> files.

Yeah, I don't expect much from PNG. The images are very small but I 
might be sending a LOT of them over a pipe which is fairly tight, so 
50-60 bytes matters. That's why I selected GIF.

> (BTW: "slight tweaking" may have an effect on file-size if it introduces
> new colors, because GIF uses a color-table. I guess you know all this.)

Yeah, I know this is possible, which is why the tweaking was to be very 
careful: these images all have only a couple indexed colors each, and I 
should be able to do the tweaks and not increase the size excessively.

However, the problem is: I left out all the tweaks and it still 
exploded in size.

Just opening, and then saving the same file with no changes at all, 
resulted in a 72 byte file growing to 920.

I thought it was GIF87a vs GIF89a... but have since come to determine 
it doesn't appear to be. I decided to give PNG a try again, since those 
extra 50 bytes *matter*, but if I can't get GIF to work, 50 is better 
then 900. Unfortunately, I hit the same wall there.

If I convert these itty-bitty images into PNG, they're about 120 bytes 
or so. Opening one in PNG, making no changes, and saving, results in 
the new file being 900 bytes too :(

So I wonder if there's just some hyper-optimization Photoshop does that 
PIL can't round-trip.

> GIF uses the LZW algorithm, and so does zip and gzip (the latter with an
> additional layer of Huffmann coding). If your images are of fixed size,
> you _may_ be better off compressing the raw data with a general purpose
> compressor (i.e., gzip). Check the packages gzip and zlib.

Hm. I hadn't thought of compressing the saved version. I could do that, 
I suppose: it just seems there is so much extra stuff which shouldn't 
be needed that's being saved out.

-- 
--S

... p.s: change the ".invalid" to ".com" in email address to reply privately.



From v.harishankar at gmail.com  Sat Mar 27 23:32:16 2010
From: v.harishankar at gmail.com (Harishankar)
Date: Sun, 28 Mar 2010 03:32:16 +0000 (UTC)
Subject: GIF89A and PIL
References: <2010032618455468300-aptshansen@gmailinvalid>
	<87oci9hjz9.fsf@dpt-info.u-strasbg.fr>
	<2010032719445464825-aptshansen@gmailinvalid>
Message-ID: <homik0$1leu$1@news.telesweet.net>

On Sat, 27 Mar 2010 19:44:54 -0700, Stephen Hansen wrote:

> On 2010-03-27 08:17:46 -0700, Alain Ketterlin said:
> 
>> Stephen Hansen <apt.shansen at gmail.invalid> writes:
> 
>>> If not, are there any decent other image libraries out there that
>>> anyone's familiar with? The only one I could find was PythonMagick,
>>> which seems completely undocumented. Or I'm blind.
>> 
>> I don't know PythonMagick, but it is based on ImageMagick, which is
>> kind of a swiss-knife in image manipulation and conversion. You could
>> try the standalone tools first, to see if you get what you want/need.
> 
> Well, I know it -can- do what I need, except the subprocess business
> isn't something I want to deal with. And the library seems utterly
> undocumented. :(
> 
>> Hmm, a 16x16 image. Don't expect much from the most sophisticated
>> formats (e.g, PNG), because their overhead (headers etc.) may well be
>> above the size of the data. Compression isn't usually targeted at small
>> files.
> 
> Yeah, I don't expect much from PNG. The images are very small but I
> might be sending a LOT of them over a pipe which is fairly tight, so
> 50-60 bytes matters. That's why I selected GIF.
> 
>> (BTW: "slight tweaking" may have an effect on file-size if it
>> introduces new colors, because GIF uses a color-table. I guess you know
>> all this.)
> 
> Yeah, I know this is possible, which is why the tweaking was to be very
> careful: these images all have only a couple indexed colors each, and I
> should be able to do the tweaks and not increase the size excessively.
> 
> However, the problem is: I left out all the tweaks and it still exploded
> in size.
> 
> Just opening, and then saving the same file with no changes at all,
> resulted in a 72 byte file growing to 920.
> 
> I thought it was GIF87a vs GIF89a... but have since come to determine it
> doesn't appear to be. I decided to give PNG a try again, since those
> extra 50 bytes *matter*, but if I can't get GIF to work, 50 is better
> then 900. Unfortunately, I hit the same wall there.
> 
> If I convert these itty-bitty images into PNG, they're about 120 bytes
> or so. Opening one in PNG, making no changes, and saving, results in the
> new file being 900 bytes too :(
> 
> So I wonder if there's just some hyper-optimization Photoshop does that
> PIL can't round-trip.
> 
>> GIF uses the LZW algorithm, and so does zip and gzip (the latter with
>> an additional layer of Huffmann coding). If your images are of fixed
>> size, you _may_ be better off compressing the raw data with a general
>> purpose compressor (i.e., gzip). Check the packages gzip and zlib.
> 
> Hm. I hadn't thought of compressing the saved version. I could do that,
> I suppose: it just seems there is so much extra stuff which shouldn't be
> needed that's being saved out.

This might not be of much use to you, but I've found by experience that 
PNGs are almost always bigger or equal to GIFs of the same resolution, 
colour depth and so on. I've never yet seen a PNG file that is smaller 
than a GIF for the same set of pixels.

As mentioned above, compressing raw data stream might be more beneficial 
in this situation.

Also try the pngcrush utility and see what size it gives you.
http://pmt.sourceforge.net/pngcrush/

-- 
Harishankar (http://harishankar.org http://literaryforums.org)


From apt.shansen at gmail.invalid  Sun Mar 28 00:31:16 2010
From: apt.shansen at gmail.invalid (Stephen Hansen)
Date: Sat, 27 Mar 2010 21:31:16 -0700
Subject: Classes as namespaces?
References: <hoihgt$p6t$1@reader1.panix.com>
Message-ID: <2010032721311671584-aptshansen@gmailinvalid>

On 2010-03-26 07:49:02 -0700, kj said:

> What's the word on using "classes as namespaces"?  E.g.
> 
> class _cfg(object):
>     spam = 1
>     jambon = 3
>     huevos = 2
> 
> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
> 
> 
> Granted, this is not the "intended use" for classes, and therefore
> could be viewed as a misuse ("that's what dictionaries are for",
> etc.).  But other than this somewhat academic objection[*], I really
> can see no problem with using classes in this way.

On the contrary, this is the intended use of classes. Or at least, one 
of them. A class *is* a namespace, albeit one that you must address 
explicitly unlike the local and global namespaces which are usually 
implicit.

That said...

> [*] My own subjective dislike for the widespread practice of using
> triple quotes to comment out code is formally similar to this one
> ("the 'intended use' for triple-quoting is not to comment out code",
> etc.).  Here I find myself on the opposite side of the purist/pragmatic
> divide.  Hmmm.

What?!

Where do you get this "widespread practice"? You mentioned that before 
when you last posted about that and I forgot to comment. I've never 
seen it.

In the 110k lines of in-house code I maintain, we don't use it once; we 
have somewhere around 300k lines of third-party code from a wide range 
of sources, and although I haven't reviewed it all by any means, I 
regularly have to peek over it and I never seen triple quoted 
"comments".

Hell, I almost never see commented -code-. Code should only be 
commented while fiddling or debugging. Once fiddlng is done, dead code 
should be removed.

I'm sure it -happens- every once in awhile, but.. why? Who uses editors 
that can't block comment/uncomment anymore? :(

-- 
--S

... p.s: change the ".invalid" to ".com" in email address to reply privately.



From sccolbert at gmail.com  Sun Mar 28 01:21:18 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Sun, 28 Mar 2010 01:21:18 -0400
Subject: GIF89A and PIL
In-Reply-To: <homik0$1leu$1@news.telesweet.net>
References: <2010032618455468300-aptshansen@gmailinvalid>
	<87oci9hjz9.fsf@dpt-info.u-strasbg.fr>
	<2010032719445464825-aptshansen@gmailinvalid>
	<homik0$1leu$1@news.telesweet.net>
Message-ID: <7f014ea61003272221t15e84931hf56411ecd00a1cb5@mail.gmail.com>

since the images only use a couple colors each, just run length encode it.
Depending on the image, you may be able to get a super small size that way,
and avoid the whole mess.

On Sat, Mar 27, 2010 at 11:32 PM, Harishankar <v.harishankar at gmail.com>wrote:

> On Sat, 27 Mar 2010 19:44:54 -0700, Stephen Hansen wrote:
>
> > On 2010-03-27 08:17:46 -0700, Alain Ketterlin said:
> >
> >> Stephen Hansen <apt.shansen at gmail.invalid> writes:
> >
> >>> If not, are there any decent other image libraries out there that
> >>> anyone's familiar with? The only one I could find was PythonMagick,
> >>> which seems completely undocumented. Or I'm blind.
> >>
> >> I don't know PythonMagick, but it is based on ImageMagick, which is
> >> kind of a swiss-knife in image manipulation and conversion. You could
> >> try the standalone tools first, to see if you get what you want/need.
> >
> > Well, I know it -can- do what I need, except the subprocess business
> > isn't something I want to deal with. And the library seems utterly
> > undocumented. :(
> >
> >> Hmm, a 16x16 image. Don't expect much from the most sophisticated
> >> formats (e.g, PNG), because their overhead (headers etc.) may well be
> >> above the size of the data. Compression isn't usually targeted at small
> >> files.
> >
> > Yeah, I don't expect much from PNG. The images are very small but I
> > might be sending a LOT of them over a pipe which is fairly tight, so
> > 50-60 bytes matters. That's why I selected GIF.
> >
> >> (BTW: "slight tweaking" may have an effect on file-size if it
> >> introduces new colors, because GIF uses a color-table. I guess you know
> >> all this.)
> >
> > Yeah, I know this is possible, which is why the tweaking was to be very
> > careful: these images all have only a couple indexed colors each, and I
> > should be able to do the tweaks and not increase the size excessively.
> >
> > However, the problem is: I left out all the tweaks and it still exploded
> > in size.
> >
> > Just opening, and then saving the same file with no changes at all,
> > resulted in a 72 byte file growing to 920.
> >
> > I thought it was GIF87a vs GIF89a... but have since come to determine it
> > doesn't appear to be. I decided to give PNG a try again, since those
> > extra 50 bytes *matter*, but if I can't get GIF to work, 50 is better
> > then 900. Unfortunately, I hit the same wall there.
> >
> > If I convert these itty-bitty images into PNG, they're about 120 bytes
> > or so. Opening one in PNG, making no changes, and saving, results in the
> > new file being 900 bytes too :(
> >
> > So I wonder if there's just some hyper-optimization Photoshop does that
> > PIL can't round-trip.
> >
> >> GIF uses the LZW algorithm, and so does zip and gzip (the latter with
> >> an additional layer of Huffmann coding). If your images are of fixed
> >> size, you _may_ be better off compressing the raw data with a general
> >> purpose compressor (i.e., gzip). Check the packages gzip and zlib.
> >
> > Hm. I hadn't thought of compressing the saved version. I could do that,
> > I suppose: it just seems there is so much extra stuff which shouldn't be
> > needed that's being saved out.
>
> This might not be of much use to you, but I've found by experience that
> PNGs are almost always bigger or equal to GIFs of the same resolution,
> colour depth and so on. I've never yet seen a PNG file that is smaller
> than a GIF for the same set of pixels.
>
> As mentioned above, compressing raw data stream might be more beneficial
> in this situation.
>
> Also try the pngcrush utility and see what size it gives you.
> http://pmt.sourceforge.net/pngcrush/
>
> --
> Harishankar (http://harishankar.org http://literaryforums.org)
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From python at rcn.com  Sun Mar 28 02:36:40 2010
From: python at rcn.com (Raymond Hettinger)
Date: Sat, 27 Mar 2010 23:36:40 -0700 (PDT)
Subject: Classes as namespaces?
References: <hoihgt$p6t$1@reader1.panix.com>
Message-ID: <03b4f91e-39aa-4b97-a510-fa784ad906f6@u5g2000prd.googlegroups.com>

On Mar 26, 7:49?am, kj <no.em... at please.post> wrote:
> What's the word on using "classes as namespaces"? ?E.g.
>
> class _cfg(object):
> ? ? spam = 1
> ? ? jambon = 3
> ? ? huevos = 2
>
> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)

Works for me.


Raymond


From catalinfest at gmail.com  Sun Mar 28 02:59:05 2010
From: catalinfest at gmail.com (catalinfest at gmail.com)
Date: Sat, 27 Mar 2010 23:59:05 -0700 (PDT)
Subject: Encryption source code with md5
Message-ID: <91541c26-6f18-40c7-a0df-252a52bb7cd5@l25g2000yqd.googlegroups.com>

Dear friends .

I have two simple questions:
It is possible to encrypt with md5 python source code?
What option do I have to protect my python source code?

Thank you .


From garabik-news-2005-05 at kassiopeia.juls.savba.sk  Sun Mar 28 03:22:11 2010
From: garabik-news-2005-05 at kassiopeia.juls.savba.sk (garabik-news-2005-05 at kassiopeia.juls.savba.sk)
Date: Sun, 28 Mar 2010 07:22:11 +0000 (UTC)
Subject: GIF89A and PIL
References: <2010032618455468300-aptshansen@gmailinvalid>
	<87oci9hjz9.fsf@dpt-info.u-strasbg.fr>
	<2010032719445464825-aptshansen@gmailinvalid>
	<homik0$1leu$1@news.telesweet.net>
Message-ID: <hon032$fhn$1@speranza.aioe.org>

Harishankar <v.harishankar at gmail.com> wrote:
> 
>> Just opening, and then saving the same file with no changes at all,
>> resulted in a 72 byte file growing to 920.
>> 
>> I thought it was GIF87a vs GIF89a... but have since come to determine it
>> doesn't appear to be. I decided to give PNG a try again, since those
>> extra 50 bytes *matter*, but if I can't get GIF to work, 50 is better
>> then 900. Unfortunately, I hit the same wall there.
>> 
 
> Also try the pngcrush utility and see what size it gives you.
> http://pmt.sourceforge.net/pngcrush/
>

optipng gives slightly better results. 

Anyway, depending on your pictures, you might find out that using
*.ppm.gz, *.pgm.gz or *.pbm.gz outperforms both optimised gif ad png...
and if sending more pictures down the line, tar-ing them (*.p?m) and
compressing the result will give even better sizes.


-- 
 -----------------------------------------------------------
| Radovan Garab?k http://kassiopeia.juls.savba.sk/~garabik/ |
| __..--^^^--..__    garabik @ kassiopeia.juls.savba.sk     |
 -----------------------------------------------------------
Antivirus alert: file .signature infected by signature virus.
Hi! I'm a signature virus! Copy me into your signature file to help me spread!


From agoretoy at gmail.com  Sun Mar 28 04:15:22 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Sun, 28 Mar 2010 02:15:22 -0600
Subject: Encryption source code with md5
In-Reply-To: <91541c26-6f18-40c7-a0df-252a52bb7cd5@l25g2000yqd.googlegroups.com>
References: <91541c26-6f18-40c7-a0df-252a52bb7cd5@l25g2000yqd.googlegroups.com>
Message-ID: <c9d33c541003280115g5ae4dae7g752931f5bd7df82b@mail.gmail.com>

There's not many options when it comes to obfuscating python source. If you
even do find a way to obfuscate it. It won't take much to reverse it. That's
just how python works. Really I wouldn't even worry about looking for a way
to do this, reason behind that is that it's not difficult to reverse it.
This is not c,c++, php or java man/woman. Good luck.

Thank you,
-Alex Goretoy
http://launchpad.net/~a1g


On Sun, Mar 28, 2010 at 12:59 AM, catalinfest at gmail.com <
catalinfest at gmail.com> wrote:

> Dear friends .
>
> I have two simple questions:
> It is possible to encrypt with md5 python source code?
> What option do I have to protect my python source code?
>
> Thank you .
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From starglider.dev at gmail.com  Sun Mar 28 06:02:03 2010
From: starglider.dev at gmail.com (starglider develop)
Date: Sun, 28 Mar 2010 11:02:03 +0100
Subject: Encryption source code with md5
In-Reply-To: <91541c26-6f18-40c7-a0df-252a52bb7cd5@l25g2000yqd.googlegroups.com>
References: <91541c26-6f18-40c7-a0df-252a52bb7cd5@l25g2000yqd.googlegroups.com>
Message-ID: <a7268e571003280302v6d7efb51w17a03d424127d97a@mail.gmail.com>

py2exe

On 28 March 2010 07:59, catalinfest at gmail.com <catalinfest at gmail.com> wrote:

> Dear friends .
>
> I have two simple questions:
> It is possible to encrypt with md5 python source code?
> What option do I have to protect my python source code?
>
> Thank you .
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From ldo at geek-central.gen.new_zealand  Sun Mar 28 06:08:22 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sun, 28 Mar 2010 23:08:22 +1300
Subject: Encryption source code with md5
References: <91541c26-6f18-40c7-a0df-252a52bb7cd5@l25g2000yqd.googlegroups.com>
Message-ID: <hon9qm$8ei$2@lust.ihug.co.nz>

In message <91541c26-6f18-40c7-
a0df-252a52bb7cd5 at l25g2000yqd.googlegroups.com>, catalinfest at gmail.com 
wrote:

> It is possible to encrypt with md5 python source code?

Don?t use MD5.

> What option do I have to protect my python source code?

Copyright.


From news1234 at free.fr  Sun Mar 28 06:25:36 2010
From: news1234 at free.fr (News123)
Date: Sun, 28 Mar 2010 12:25:36 +0200
Subject: Classes as namespaces?
In-Reply-To: <2010032721311671584-aptshansen@gmailinvalid>
References: <hoihgt$p6t$1@reader1.panix.com>
	<2010032721311671584-aptshansen@gmailinvalid>
Message-ID: <4baf2ea0$0$4595$426a74cc@news.free.fr>

Hi STephen,

Stephen Hansen wrote:

> That said...
> 
>> [*] My own subjective dislike for the widespread practice of using
>> triple quotes to comment out code is formally similar to this one
>> ("the 'intended use' for triple-quoting is not to comment out code",
>> etc.).  Here I find myself on the opposite side of the purist/pragmatic
>> divide.  Hmmm.
> 
> What?!
> 
> Where do you get this "widespread practice"? You mentioned that before
> when you last posted about that and I forgot to comment. I've never seen
> it.
I wouldn't say it's wide spread, but definitely something one
encounters. Especially with python rather new to python
> 
> In the 110k lines of in-house code I maintain, we don't use it once; we
> have somewhere around 300k lines of third-party code from a wide range
> of sources, and although I haven't reviewed it all by any means, I
> regularly have to peek over it and I never seen triple quoted "comments".
> 
> Hell, I almost never see commented -code-. Code should only be commented
> while fiddling or debugging. Once fiddlng is done, dead code should be
> removed.
> 
> I'm sure it -happens- every once in awhile, but.. why? Who uses editors
> that can't block comment/uncomment anymore? :(

I had to explain block comment / uncomment to some collegues before the
triple quote commenting disappeared from our code.
Unfortunaltely everybody uses a different type of editor, so I googled
for them to show them what their editors can do.

You'd be surprised how many people do neither master their editors nor
care for it.

bye

N


From python at bdurham.com  Sun Mar 28 06:48:52 2010
From: python at bdurham.com (python at bdurham.com)
Date: Sun, 28 Mar 2010 06:48:52 -0400
Subject: Programmatically discovering encoding types supported by codecs 
	module
In-Reply-To: <op.u93gdxodx6zn5v@gabriel.sleipnir-bsas>
References: <1269447436.19612.1366507993@webmail.messagingengine.com><op.u921zuyjx6zn5v@gabriel.sleipnir-bsas><1269453527.7192.1366528303@webmail.messagingengine.com>
	<op.u93gdxodx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <1269773332.19498.1367099243@webmail.messagingengine.com>

Gabriel,

Thank you for your analysis - very interesting. Enjoyed your fromlist
choice of names. I'm still in my honeymoon phase with Python so I only
know the first part :)

Regards,
Malcolm


----- Original message -----
From: "Gabriel Genellina" <gagsl-py2 at yahoo.com.ar>
To: python-list at python.org
Date: Wed, 24 Mar 2010 19:50:11 -0300
Subject: Re: Programmatically discovering encoding types supported by
codecs    module

En Wed, 24 Mar 2010 14:58:47 -0300, <python at bdurham.com> escribi?:

>> After looking at how things are done in codecs.c and  
>> encodings/__init__.py  I think you should enumerate all modules in the  
>> encodings package that define a getregentry function. Aliases come from  
>> encodings.aliases.aliases.
>
> Thanks for looking into this for me. Benjamin Kaplan made a similar
> observation. My reply to him included the snippet of code we're using to
> generate the actual list of encodings that our software will support
> (thanks to Python's codecs and encodings modules).

I was curious as whether both methods would give the same results:

py> modules=set()
py> for name in glob.glob(os.path.join(encodings.__path__[0], "*.py")):
...   name = os.path.basename(name)[:-3]
...   try: mod = __import__("encodings."+name,  
fromlist=['ilovepythonbutsometimesihateit'])
...   except ImportError: continue
...   if hasattr(mod, 'getregentry'):
...     modules.add(name)
...
py> fromalias = set(encodings.aliases.aliases.values())
py> fromalias - modules
set(['tactis'])
py> modules - fromalias
set(['charmap',
      'cp1006',
      'cp737',
      'cp856',
      'cp874',
      'cp875',
      'idna',
      'iso8859_1',
      'koi8_u',
      'mac_arabic',
      'mac_centeuro',
      'mac_croatian',
      'mac_farsi',
      'mac_romanian',
      'palmos',
      'punycode',
      'raw_unicode_escape',
      'string_escape',
      'undefined',
      'unicode_escape',
      'unicode_internal',
      'utf_8_sig'])

There is a missing 'tactis' encoding (?) and about twenty without alias.

-- 
Gabriel Genellina

-- 
http://mail.python.org/mailman/listinfo/python-list



From arunbgg at gmail.com  Sun Mar 28 07:09:05 2010
From: arunbgg at gmail.com (Arun Balagopal)
Date: Sun, 28 Mar 2010 16:39:05 +0530
Subject: Need help with using SOAP based web service
Message-ID: <29c2bde91003280409y7460ca50oabacec7f1271d0ca@mail.gmail.com>

Hi,
I am working on a project in text mining using Python. As part of the
project I need to use a technical term extractor, and I found the
Termine<http://www.nactem.ac.uk/software/termine/#form>system from
NACTEM very useful. I have used the web demo (it's pretty nifty)
and now want to integrate it in my project. The service provides a SOAP
interface, which I am trying to use in Python with the ZSI 2.0 module (I
have never used it before). The sample client scripts and instructions for
Python are provided here<http://www.nactem.ac.uk/software/termine/webservice/>

Here's what I did. I installed ZSI 2.0 and its dependency PyXml. Then as
given in the instructions, I generated wrappers for the service (2 python
files). However when I try to run the sample script, I get errors (something
about no attribute 'typecode'). I have tried tweaking in the source, but
still no luck.

If anybody knows how exactly to get this thing working, please help. I am
new to the mailing list, and I apologize if this is the wrong place to post
such questions.

Thank you
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From irmen.NOSPAM at xs4all.nl  Sun Mar 28 07:17:24 2010
From: irmen.NOSPAM at xs4all.nl (Irmen de Jong)
Date: Sun, 28 Mar 2010 13:17:24 +0200
Subject: Encryption source code with md5
In-Reply-To: <hon9qm$8ei$2@lust.ihug.co.nz>
References: <91541c26-6f18-40c7-a0df-252a52bb7cd5@l25g2000yqd.googlegroups.com>
	<hon9qm$8ei$2@lust.ihug.co.nz>
Message-ID: <4baf3ac4$0$22903$e4fe514c@news.xs4all.nl>

On 28-3-2010 12:08, Lawrence D'Oliveiro wrote:
> In message<91541c26-6f18-40c7-
> a0df-252a52bb7cd5 at l25g2000yqd.googlegroups.com>, catalinfest at gmail.com
> wrote:
>
>> It is possible to encrypt with md5 python source code?
>
> Don?t use MD5.

Also, md5 is not an encryption algorithm at all, it is a secure hashing function.
(well, not so secure anymore nowadays, which probably is why Lawrence already wrote to 
avoid using it).

irmen


From kelithaem at gmail.com  Sun Mar 28 07:30:51 2010
From: kelithaem at gmail.com (Rolla)
Date: Sun, 28 Mar 2010 04:30:51 -0700 (PDT)
Subject: AUTHENTIC DESIGNER HANDBAGS ACCESSORIES GREAT DISCOUNTS! 
	WWW.VOGUELANDE.COM
Message-ID: <5820a042-2e7d-4f3a-a672-cd4a4315a72f@g28g2000prb.googlegroups.com>

Dear Customer,

We now have NEW ARRIVAL accessories coming. Please check the site as
follows,

http://www.voguelande.com/ChanelAcce.html

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CONTACT INFO: INFO at VOGUELANDE.COM


From zaq2442 at gmail.com  Sun Mar 28 08:12:49 2010
From: zaq2442 at gmail.com (=?UTF-8?B?2KfYp9in2KfZhNmI2KfZgdmK?=)
Date: Sun, 28 Mar 2010 05:12:49 -0700 (PDT)
Subject: =?windows-1256?B?0czhIM3H4+Eg3e0gx+Hf5u3KICEhISDV5tE=?=
Message-ID: <0a44111d-e4f8-4822-a4cd-828bb3fa54a8@q15g2000yqj.googlegroups.com>

http://www.nb11.net/vb/forumdisplay.php?f=25


From catalinfest at gmail.com  Sun Mar 28 09:00:58 2010
From: catalinfest at gmail.com (catalinfest at gmail.com)
Date: Sun, 28 Mar 2010 06:00:58 -0700 (PDT)
Subject: Encryption source code with md5
References: <91541c26-6f18-40c7-a0df-252a52bb7cd5@l25g2000yqd.googlegroups.com>
	<hon9qm$8ei$2@lust.ihug.co.nz>
	<4baf3ac4$0$22903$e4fe514c@news.xs4all.nl>
Message-ID: <e8546002-d379-45fc-b834-753cdcccb91a@k13g2000yqe.googlegroups.com>

I had a talk about Python and distribution of commercial products
created with python. This made me think of a way to protect my source
code to be distributed. I thought a live CD version and then to an
encryption method of a portion of source code. These thoughts are the
source of two questions.


From l.quesada at 4c.ucc.ie  Sun Mar 28 09:26:43 2010
From: l.quesada at 4c.ucc.ie (Luis Quesada)
Date: Sun, 28 Mar 2010 14:26:43 +0100
Subject: map, index
Message-ID: <mOIrn.824$I8.247@news.indigo.ie>

Dear all,

I am new to Python, so I apologize in advance if you find my questions 
naive (or if they have been already answered in this forum).

1. What is the most pythonic way of mapping a list where the value each 
element is mapped to depends on the index of the element. Is there a way 
of writing the following without using zip:
	map(lambda (id,v):id*v,zip(range(len(L)),L))
I wonder whether there is something like mapInd in Oz 
(http://www.mozart-oz.org/documentation/base/list.html) so that you can 
pass a binary function to map and refer to the index of the element in 
the body of the given function. It would be cool to be able to simply write:
	mapInd(lambda id,v:id*v,L)

2. Is there a higher order index function that lets you specify the 
condition to be met by the returned element. I mean something like:

def my_index(f,L,default):
     for x in L:
         if f(x):return x
     return default

Thanks in advance for your answer!

Cheers,
Luis


From ethan at stoneleaf.us  Sun Mar 28 09:46:36 2010
From: ethan at stoneleaf.us (Ethan Furman)
Date: Sun, 28 Mar 2010 06:46:36 -0700
Subject: Simple Traits Questions
In-Reply-To: <hom7jl$a75$1@dough.gmane.org>
References: <4BAE05C6.4070601@stoneleaf.us> <hom7jl$a75$1@dough.gmane.org>
Message-ID: <4BAF5DBC.7050909@stoneleaf.us>

Robert Kern wrote:
> On 2010-03-27 08:19 , Ethan Furman wrote:
> 
>> Okay, different post for my actual questions.  :)
>>
>> On the PyPI page for strait (http://pypi.python.org/pypi/strait/0.5.1)
>> it has the example of choosing which methods to keep in the composed 
>> class:
>>
>> class TOSWidget(BaseWidget):
>> __metaclass__ = include(Pack, Place, Grid)
>> info = Pack.info.im_func
>> config = Pack.config.im_func
>> configure = Pack.configure.im_func
>> slaves = Pack.slaves.im_func
>> forget = Pack.forget.im_func
>> propagate = Pack.propagate.im_func
>>
>> My question is:
>>
>> Why use
>>
>> info = Pack.info.im_func
>>
>> instead of
>>
>> info = Pack.info
>>
>> ?
> 
> 
> Pack.info is an unbound method object attached to the Pack class, not a 
> function object. It has some extra semantics on top of functions and is 
> tied to the Pack class. The .im_func attribute gets the actual function 
> object underneath. When defining the TOSWidget class, the objects 
> defined in the suite under the class: statement need to be actual 
> functions in order to be turned into unbound methods attached to the 
> TOSWidget class.

Ah, thank you.

In Python 3, though, would the Pack.info form be correct?

~Ethan~



From duncan.booth at invalid.invalid  Sun Mar 28 09:53:36 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 28 Mar 2010 13:53:36 GMT
Subject: map, index
References: <mOIrn.824$I8.247@news.indigo.ie>
Message-ID: <Xns9D499780917D2duncanbooth@127.0.0.1>

Luis Quesada <l.quesada at 4c.ucc.ie> wrote:

> Is there a way 
> of writing the following without using zip:
>      map(lambda (id,v):id*v,zip(range(len(L)),L))

[ id*v for id,v in enumerate(L) ]


From steve at holdenweb.com  Sun Mar 28 10:08:20 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 28 Mar 2010 10:08:20 -0400
Subject: Encryption source code with md5
In-Reply-To: <e8546002-d379-45fc-b834-753cdcccb91a@k13g2000yqe.googlegroups.com>
References: <91541c26-6f18-40c7-a0df-252a52bb7cd5@l25g2000yqd.googlegroups.com>	<hon9qm$8ei$2@lust.ihug.co.nz>	<4baf3ac4$0$22903$e4fe514c@news.xs4all.nl>
	<e8546002-d379-45fc-b834-753cdcccb91a@k13g2000yqe.googlegroups.com>
Message-ID: <honnsn$spu$1@dough.gmane.org>

catalinfest at gmail.com wrote:
> I had a talk about Python and distribution of commercial products
> created with python. This made me think of a way to protect my source
> code to be distributed. I thought a live CD version and then to an
> encryption method of a portion of source code. These thoughts are the
> source of two questions.

I'd suggest that you don't think about encrypting your source code until
you have a rather better handle on encryption technology. Your mention
of MD5, a hashing rather than an encryption algorithm, makes it clear
that you aren't familiar with the technologies at present.

There's nothing wrong with ignorance (I have a more than adequate supply
of my own), but in encryption it's *very* easy to make mistakes that
render whole systems vulnerable to trivial attack. So you do really need
to know what you are doing.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From showell30 at yahoo.com  Sun Mar 28 10:16:10 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Sun, 28 Mar 2010 07:16:10 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
Message-ID: <ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>

On Mar 27, 3:18?am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Fri, 26 Mar 2010 07:31:17 -0700, Steve Howell wrote:
> > From a purely academic standpoint, I'm not convinced that sum() is
> > inefficient in terms of big-O complexity, though.
>
> > ?showell at showell-laptop:~$ python
> > ?Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41) [GCC 4.3.3] on
> > ?linux2
> > ?>>> class StupidList:
>
> [...]
>
> But it's not *sum* that is inefficient, it is sum *with a particular data
> structure*.
>

Yep, the implied context was with particular data structures.

> Sure, if you create your own data structure, you can make it as efficient
> as you like. Obviously the sum algorithm itself has to perform one
> addition per item, or O(N), which scales tolerably well. But each
> addition has a cost. If the cost is constant, then sum() as a whole
> remains O(N). But if the cost of addition varies with N, sum() degrades
> ba
>

The surprising part of sum() is not that the outer loop to do the sums
is O(N).  It is hard to imagine any other implementation (without
parallelizing it).

The mildly surprising part of sum() is that is does add vs. add-in-
place, which leads to O(N) vs. O(1) for the inner loop calls, for
certain data structures, notably lists, even though none of the
intermediate results get used by the caller.  For lists, you could
make a more efficient variant of sum() that clones the start value and
does add-in-place.

I could guess pretty confidently that the reason this optimization was
never tried is that sum() has always been intended to be used on
numerics, since other alternatives exist for strings (join), lists
(chain), and hand-coded data classes that support add-in-place (roll-
your-own loop).

The documentation is pretty clear on the intention that sum() is
intended for numbers:

http://docs.python.org/library/functions.html#sum

Except for strings, the docs are not explicit about efficiency
concerns for other data structures, or the fact that the reference
implementation does add vs. add-in-place under the hood.




http://docs.python.org/library/functions.html#sum


From michele.simionato at gmail.com  Sun Mar 28 10:17:24 2010
From: michele.simionato at gmail.com (Michele Simionato)
Date: Sun, 28 Mar 2010 07:17:24 -0700 (PDT)
Subject: function decorator-like function
References: <9935ff3e-ff2f-44b8-83f4-60883b1512ac@k17g2000yqb.googlegroups.com>
	<90fe2ae8-cf1e-4d89-8b6d-2802874e64b5@e7g2000yqf.googlegroups.com> 
	<c32492f2-3c6c-48a1-9dd4-f7faeed21347@k17g2000yqb.googlegroups.com> 
	<b7dd0538-7300-476c-adfe-8b18b9f1bf9c@g4g2000yqa.googlegroups.com> 
	<40ba11d3-5a18-4da4-a48a-0dd815f3b459@35g2000yqm.googlegroups.com>
Message-ID: <1ea8ca8b-b556-44f1-9af8-75e1f60c5fb1@i25g2000yqm.googlegroups.com>

Another option is to use my own decorator module (http://
pypi.python.org/pypi/decorator):

from decorator import decorator

@decorator
def d(func, *args):
    print 3
    return func(*args)

@d
def f(a, b):
    print a + b

f(5, 7)




From l.quesada at 4c.ucc.ie  Sun Mar 28 10:34:12 2010
From: l.quesada at 4c.ucc.ie (Luis Quesada)
Date: Sun, 28 Mar 2010 15:34:12 +0100
Subject: map, index
In-Reply-To: <Xns9D499780917D2duncanbooth@127.0.0.1>
References: <mOIrn.824$I8.247@news.indigo.ie>
	<Xns9D499780917D2duncanbooth@127.0.0.1>
Message-ID: <CNJrn.825$I8.401@news.indigo.ie>

Duncan Booth wrote:
> Luis Quesada <l.quesada at 4c.ucc.ie> wrote:
> 
>> Is there a way 
>> of writing the following without using zip:
>>      map(lambda (id,v):id*v,zip(range(len(L)),L))
> 
> [ id*v for id,v in enumerate(L) ]
Cool! Thanks!
Cheers,
Luis


From v.harishankar at gmail.com  Sun Mar 28 10:39:12 2010
From: v.harishankar at gmail.com (Harishankar)
Date: Sun, 28 Mar 2010 14:39:12 +0000 (UTC)
Subject: Encryption source code with md5
References: <91541c26-6f18-40c7-a0df-252a52bb7cd5@l25g2000yqd.googlegroups.com>
	<hon9qm$8ei$2@lust.ihug.co.nz>
	<4baf3ac4$0$22903$e4fe514c@news.xs4all.nl>
	<e8546002-d379-45fc-b834-753cdcccb91a@k13g2000yqe.googlegroups.com>
	<mailman.1269.1269785330.23598.python-list@python.org>
Message-ID: <honpmg$718$1@news.telesweet.net>

On Sun, 28 Mar 2010 10:08:20 -0400, Steve Holden wrote:

> catalinfest at gmail.com wrote:
>> I had a talk about Python and distribution of commercial products
>> created with python. This made me think of a way to protect my source
>> code to be distributed. I thought a live CD version and then to an
>> encryption method of a portion of source code. These thoughts are the
>> source of two questions.
> 
> I'd suggest that you don't think about encrypting your source code until
> you have a rather better handle on encryption technology. Your mention
> of MD5, a hashing rather than an encryption algorithm, makes it clear
> that you aren't familiar with the technologies at present.
> 
> There's nothing wrong with ignorance (I have a more than adequate supply
> of my own), but in encryption it's *very* easy to make mistakes that
> render whole systems vulnerable to trivial attack. So you do really need
> to know what you are doing.
> 
> regards
>  Steve

This article offers some good ideas and also sums up some good points 
*against* code obfuscation.

http://stackoverflow.com/questions/261638/how-do-i-protect-python-code

Read it and judge whether the benefits of not obfuscating code outweighs 
the advantages of obfuscating it.





-- 
Harishankar (http://harishankar.org http://literaryforums.org)


From steve at REMOVE-THIS-cybersource.com.au  Sun Mar 28 10:57:08 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 28 Mar 2010 14:57:08 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
Message-ID: <4baf6e43$0$8756$c3e8da3@news.astraweb.com>

On Sun, 28 Mar 2010 07:16:10 -0700, Steve Howell wrote:

> The mildly surprising part of sum() is that is does add vs. add-in-
> place, which leads to O(N) vs. O(1) for the inner loop calls, for
> certain data structures, notably lists, even though none of the
> intermediate results get used by the caller.  For lists, you could make
> a more efficient variant of sum() that clones the start value and does
> add-in-place.

I have no doubt that you could make a version of sum for lists which is 
more efficient than the existing one. After all, join more or less does 
the same sort of thing, and it's very efficient. But don't think that add-
in-place is necessarily cheap. List appends are amortized O(1) each; if 
you are adding M lists of N items each, that gives you O(M*N).

It's possible to improve the performance a tad if you can make multiple 
appends in roughly constant time, which is what list.extend (probably?) 
does, but only up to a point. Lists are over-allocated, but if you try to 
add more items than there is room for, you need to make the list bigger, 
and that means reallocating memory, which could easily be O(N**2) or 
worse, depending on how good your OS's memory management is. Under Linux, 
at least by default, malloc will never fail, but there's no guarantee how 
long it will take to return. If the OOM killer has to start shutting down 
other applications, and paging more and more memory to disk, eventually 
malloc will return (or the system will core dump), but it could take a 
while...



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sun Mar 28 10:58:18 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 28 Mar 2010 14:58:18 GMT
Subject: Encryption source code with md5
References: <91541c26-6f18-40c7-a0df-252a52bb7cd5@l25g2000yqd.googlegroups.com>
	<hon9qm$8ei$2@lust.ihug.co.nz>
	<4baf3ac4$0$22903$e4fe514c@news.xs4all.nl>
	<e8546002-d379-45fc-b834-753cdcccb91a@k13g2000yqe.googlegroups.com>
	<mailman.1269.1269785330.23598.python-list@python.org>
Message-ID: <4baf6e8a$0$8756$c3e8da3@news.astraweb.com>

On Sun, 28 Mar 2010 10:08:20 -0400, Steve Holden wrote:

> catalinfest at gmail.com wrote:
>> I had a talk about Python and distribution of commercial products
>> created with python. This made me think of a way to protect my source
>> code to be distributed. I thought a live CD version and then to an
>> encryption method of a portion of source code. These thoughts are the
>> source of two questions.
> 
> I'd suggest that you don't think about encrypting your source code until
> you have a rather better handle on encryption technology. Your mention
> of MD5, a hashing rather than an encryption algorithm, makes it clear
> that you aren't familiar with the technologies at present.

Furthermore, you should forget about encrypting your program until you 
are sure that it is something that needs encrypting. In my experience, 
most times newbies start waffling on about encrypting their precious code 
(usually displaying total confusion about encryption technology), it 
turns out their critical application is something like Notepad only with 
fewer features.

Not that I'm jaded at all.



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sun Mar 28 10:59:18 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 28 Mar 2010 14:59:18 GMT
Subject: StringChain -- a data structure for managing large sequences of
	chunks of bytes
References: <mailman.646.1268377905.23598.python-list@python.org>
	<4b9a00ce$0$27822$c3e8da3@news.astraweb.com>
	<mailman.1055.1269234593.23598.python-list@python.org>
	<pan.2010.03.22.08.07.48@REMOVE.THIS.cybersource.com.au>
	<4bae6130$1@dnews.tpgi.com.au>
Message-ID: <4baf6ec6$0$8756$c3e8da3@news.astraweb.com>

On Sun, 28 Mar 2010 06:48:21 +1100, Lie Ryan wrote:

> On 03/22/2010 07:07 PM, Steven D'Aprano wrote:
>> Perhaps you should have said that it was a wrapper around deque giving
>> richer functionality, rather than giving the impression that it was a
>> brand new data structure invented by you. People are naturally going to
>> be more skeptical about a newly invented data structure than one based
>> on a reliable, component like deque.
> 
> Well, technically StringChain is not a data structure in the first
> place. StringChain is a string;

And strings are data structures, as are arrays and structs. Just because 
they're simple data structures made directly from primitives rather than 
rich, complex structures, doesn't mean they're not data structures.


> a string that is implemented using deque
> data structure to make appending algorithmically efficient. It is not a
> data structure, in the sense that I can't put arbitrary "thing" into the
> data structure. 

Any "thing" that can be pickled or serialised can be put into a string.



-- 
Steven


From duncan.booth at invalid.invalid  Sun Mar 28 11:17:46 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 28 Mar 2010 15:17:46 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
Message-ID: <Xns9D49A5BF95C33duncanbooth@127.0.0.1>

Steve Howell <showell30 at yahoo.com> wrote:

> The mildly surprising part of sum() is that is does add vs. add-in-
> place, which leads to O(N) vs. O(1) for the inner loop calls, for
> certain data structures, notably lists, even though none of the
> intermediate results get used by the caller.  For lists, you could
> make a more efficient variant of sum() that clones the start value and
> does add-in-place.

Doing add-in-place isn't the only way to make sum more efficient: if you 
assume that addition is associative (which of course the builtin sum can't) 
then you can form partial sums. e.g. instead of calculating:

  (((((((a + b) + c) + d) + e) + f) + g) + h)

you calculate:

  (((a + b) + (c + d)) + ((e + f) + (g + h)))

Obviously this requires more space than the naive sum, but not as much as 
you might at first expect: you only need to hold log(n) intermediates 
values at any time.

> I could guess pretty confidently that the reason this optimization was
> never tried is that sum() has always been intended to be used on
> numerics, since other alternatives exist for strings (join), lists
> (chain), and hand-coded data classes that support add-in-place (roll-
> your-own loop).

Doing it this way helps summing lists or strings (though not as much as 
str.join), but it also helps if you need to sum a long list of similarly 
sized floats as you'll get a more accurate answer.

See 
http://groups.google.com/group/comp.lang.python/browse_thread/thread/9eda29
faf92f532e/027cef7d4429aa3a
for an earlier discussion of this, or just Google comp.lang.python for 
'pairwise sum'.

Here's the code I posted in that thread:

def sumpairs(seq): 
    tmp = [] 
    for i,v in enumerate(seq): 
        if i&1: 
            tmp[-1] = tmp[-1] + v 
            i = i + 1 
            n = i & -i 
            while n > 2: 
                t = tmp.pop(-1) 
                tmp[-1] = tmp[-1] + t 
                n >>= 1 
        else: 
            tmp.append(v) 
    while len(tmp) > 1: 
        t = tmp.pop(-1) 
        tmp[-1] = tmp[-1] + t 
    return tmp[0] 

and I claimed that my Python coded sumpairs function was faster than the 
builtin sum on a list of lists once you had more than about 210 items.
I never did get round to rewriting it in C for a more realistic speed 
comparison: summing integers my Python version is about 60 times slower 
than the builtin.


From showell30 at yahoo.com  Sun Mar 28 11:55:05 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Sun, 28 Mar 2010 08:55:05 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
Message-ID: <94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>

On Mar 28, 8:17?am, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> Steve Howell <showel... at yahoo.com> wrote:
> > The mildly surprising part of sum() is that is does add vs. add-in-
> > place, which leads to O(N) vs. O(1) for the inner loop calls, for
> > certain data structures, notably lists, even though none of the
> > intermediate results get used by the caller. ?For lists, you could
> > make a more efficient variant of sum() that clones the start value and
> > does add-in-place.
>
> Doing add-in-place isn't the only way to make sum more efficient: if you
> assume that addition is associative (which of course the builtin sum can't)
> then you can form partial sums. e.g. instead of calculating:
>
> ? (((((((a + b) + c) + d) + e) + f) + g) + h)
>
> you calculate:
>
> ? (((a + b) + (c + d)) + ((e + f) + (g + h)))
>
> Obviously this requires more space than the naive sum, but not as much as
> you might at first expect: you only need to hold log(n) intermediates
> values at any time.
>

Yep, I did mention in my post that the outer loop does not *have* to
be O(N), if you can parallelize it.  Apart from reducing
intermediates, the divide-and-conquer method does not reduce overall
computation time unless you have multiple processors, correct?

> > I could guess pretty confidently that the reason this optimization was
> > never tried is that sum() has always been intended to be used on
> > numerics, since other alternatives exist for strings (join), lists
> > (chain), and hand-coded data classes that support add-in-place (roll-
> > your-own loop).
>
> Doing it this way helps summing lists or strings (though not as much as
> str.join), but it also helps if you need to sum a long list of similarly
> sized floats as you'll get a more accurate answer.
>

Interesting!  That makes sense.  The docs for math.fsum() suggest that
partial sums are used to maintain precision.

http://docs.python.org/library/math.html#math.fsum

> Seehttp://groups.google.com/group/comp.lang.python/browse_thread/thread/...
> faf92f532e/027cef7d4429aa3a
> for an earlier discussion of this, or just Google comp.lang.python for
> 'pairwise sum'.
>
> Here's the code I posted in that thread:
>
> def sumpairs(seq):
> ? ? tmp = []
> ? ? for i,v in enumerate(seq):
> ? ? ? ? if i&1:
> ? ? ? ? ? ? tmp[-1] = tmp[-1] + v
> ? ? ? ? ? ? i = i + 1
> ? ? ? ? ? ? n = i & -i
> ? ? ? ? ? ? while n > 2:
> ? ? ? ? ? ? ? ? t = tmp.pop(-1)
> ? ? ? ? ? ? ? ? tmp[-1] = tmp[-1] + t
> ? ? ? ? ? ? ? ? n >>= 1
> ? ? ? ? else:
> ? ? ? ? ? ? tmp.append(v)
> ? ? while len(tmp) > 1:
> ? ? ? ? t = tmp.pop(-1)
> ? ? ? ? tmp[-1] = tmp[-1] + t
> ? ? return tmp[0]
>
> and I claimed that my Python coded sumpairs function was faster than the
> builtin sum on a list of lists once you had more than about 210 items.
> I never did get round to rewriting it in C for a more realistic speed
> comparison: summing integers my Python version is about 60 times slower
> than the builtin.



From wolftracks at invalid.com  Sun Mar 28 12:20:21 2010
From: wolftracks at invalid.com (W. eWatson)
Date: Sun, 28 Mar 2010 09:20:21 -0700
Subject: Why this Difference in Importing NumPy 1.2 vs 1.4?
Message-ID: <honvk7$thl$1@news.eternal-september.org>

I wrote a program in Python 2.5 under Win7 and it runs fine using Numpy 
1.2 , but not on a colleague's machine who has a slightly newer 2.5 and 
uses NumPy 1.4. We both use IDLE to execute the program. During import 
he gets this:

 >>>
Traceback (most recent call last):
   File "C:\Documents and Settings\HP_Administrator.DavesDesktop\My 
Documents\Astro\Meteors\NC-FireballReport.py", line 38, in <module>
     from scipy import stats as stats # scoreatpercentile
   File "C:\Python25\lib\site-packages\scipy\stats\__init__.py", line 7, 
in <module>
     from stats import *
   File "C:\Python25\lib\site-packages\scipy\stats\stats.py", line 191, 
in <module>
     import scipy.special as special
   File "C:\Python25\lib\site-packages\scipy\special\__init__.py", line 
22, in <module>
     from numpy.testing import NumpyTest
ImportError: cannot import name NumpyTest
 >>>

Comments?

It looks as though the problem is in NumPy 1.4. If it's either in NumPy 
or SciPy, how does my colleague back out to an earlier version to agree 
with mine? Does he just pull down 1.3 or better 1.2 (I use it.), and 
install it? How does he somehow remove 1.4? Is it as easy as going to 
IDLE's path browser and removing, under site-packages, numpy? (I'm not 
sure that's even possible. I don't see a right-click menu.)


From showell30 at yahoo.com  Sun Mar 28 12:21:59 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Sun, 28 Mar 2010 09:21:59 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<4baf6e43$0$8756$c3e8da3@news.astraweb.com>
Message-ID: <2af1fb7c-5952-484b-af2a-95ea97b47994@x11g2000prb.googlegroups.com>

On Mar 28, 7:57?am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Sun, 28 Mar 2010 07:16:10 -0700, Steve Howell wrote:
> > The mildly surprising part of sum() is that is does add vs. add-in-
> > place, which leads to O(N) vs. O(1) for the inner loop calls, for
> > certain data structures, notably lists, even though none of the
> > intermediate results get used by the caller. ?For lists, you could make
> > a more efficient variant of sum() that clones the start value and does
> > add-in-place.
>
> I have no doubt that you could make a version of sum for lists which is
> more efficient than the existing one. After all, join more or less does
> the same sort of thing, and it's very efficient. But don't think that add-
> in-place is necessarily cheap. List appends are amortized O(1) each; if
> you are adding M lists of N items each, that gives you O(M*N).
>

O(M*N) is still cheaper than O(M*N*N).

> It's possible to improve the performance a tad if you can make multiple
> appends in roughly constant time, which is what list.extend (probably?)
> does, but only up to a point. Lists are over-allocated, but if you try to
> add more items than there is room for, you need to make the list bigger,
> and that means reallocating memory, which could easily be O(N**2) or
> worse, depending on how good your OS's memory management is. Under Linux,
> at least by default, malloc will never fail, but there's no guarantee how
> long it will take to return. If the OOM killer has to start shutting down
> other applications, and paging more and more memory to disk, eventually
> malloc will return (or the system will core dump), but it could take a
> while...
>

Even though extend() obviously has to do memory allocations along the
way itself, it is still more efficient than the alternative.  No need
to speculate, you can measure these methods on your platform:

    M = 10
    N = 1000

    def in_place(
        start = [],
        sublists = ([[None] * M]) * N
        ):
        accum = start[:]
        for sublist in sublists:
            accum.extend(sublist)
        return accum

    def with_intermediates(
        start = [],
        sublists = ([[None] * M]) * N
        ):
        accum = start
        for sublist in sublists:
            accum = accum + sublist
        return accum


From fhernandezn at gmail.com  Sun Mar 28 12:22:23 2010
From: fhernandezn at gmail.com (Fabian Hernandez)
Date: Sun, 28 Mar 2010 12:22:23 -0400
Subject: [Off Topic] Tech Adviser Wanted by Unusual Social Venture Startup
	AND WEBEX QUESTION
In-Reply-To: <a4798b061003270929m5ef1da0bh540a9a968c4d1e87@mail.gmail.com>
References: <a4798b061003270929m5ef1da0bh540a9a968c4d1e87@mail.gmail.com>
Message-ID: <3be2e7f21003280922t1f248ae6pb68e37caf048dded@mail.gmail.com>

2010/3/27 G.Lowell Krane <ecouplecoach at gmail.com>

> Here is the ad i am trying to get Python-list to post ASAP--this weekend.
>
> Also, in case one of your best applications is not public, and you want to
> demonstrate it, do you prefer webex or what do you prefer?
> --gary
>
> ---------- Forwarded message ----------
> From: G.Lowell Krane <ecouplecoach at gmail.com>
> Date: Fri, Mar 26, 2010 at 4:26 PM
> Subject: [Off Topic] Tech Adviser Wanted by Unusual Social Venture Startup
> To: python-list at python.org
>
>
> TECH ADVISOR (1-3 hrs/wk) WANTED FOR UNUSUAL SOCIAL VENTURE STARTUP
>
>
> This position is for an unusual well advanced (though not yet in beta)
> Social Venture Internet Startup that has hopefully figured out a way  through
> an unusually  robust web application to help the 95% of unhappy couples in
> the Western Hemisphere who cannot afford or will not trust a marriage
> therapist,  to save, ensure, deepen their relationships (about 60MM
> couples!). The monetization model is initially subscriber (very low fee that
> mkt research (harris poll) has shown the majority of these in USA, at least
> would like to use this for about $20/mo for at least 3 mo or longer as long
> as they felt it was helping at least a little.) Our startup, eCoupleCoach
> /ParejasContentas, would in fact be the pioneer of this blue ocean market
> using a conceptual advance, and employing a social media as well as "tapping
> the wisdom of the best experts" model.
>
>
> Our urgent need now is for someone who is a senior level
> developer/programmer to be able to vet three or four of the best  web
> application teams we have finally found, or at least the one python team we
> found (in Bogota, where I, the ceo/founder/head research psychologist, will
> be working with them daily to ensure  maximum efficiency).**
>
> *BTW, anyone who has gone through a tough divorce (or whose parents
> divorced at a tender age, will probably find this enormously fascinating and
> gratifying?an opportunity to turn your lemons into lemonade.*
>
> Besides the python freelance team ( team, we also have a .net  freelance
> team, and  php company . We might identify a 4th soon.  But the priority
> now is to vet the python team?one lead developer who has been doing python
> on and off (part and fulltime )for several years (but collapsed, 3 years),
> and the other developer, about 1 year. The third member of their team is
> more of a designer, doing css and html.
>
> After this vetting, we ideally hope, if you are excited about our potential
> and yours with us, that you will want to stay on  up to two hours a week (of
> course the more you can devote the better if you are interested in any other
> challenges) to at least  QA the code quality and make sure it is being
> dumped at least weekly.
>
> WHAT WE HAVE GOING FOR US: A lot. Once we hear from you, we will send
> detailed backgrounders.
>
> COMPENSATION: would be negotiable and this could also lead to a highly
> responsible high up position once we are funded.
>
> TO APPLY: PLEASE email me at eCoupleCoach at gmail.com to make initial
> contact, and send us your resume. After this we will
> Send you detailed backgrounders on who we are and what we have going for
> us.
>
> IN YOUR SIGNATURE (so easy to find): Please also indicate your skype
> contact info, for follow up phone conversation, unless you prefer chat, in
> which case your chat contact info (preferably google), since I am in
> Colombia now and will be till the beta is done, though my partner and VP of
> Product Development/Project Manager is in NYC.
>
>
>
>
>
>
> Gary Krane PhD, CEO/founder Relationship Technologies (ParejasContentas y
> eCoupleCoach)
> "Tapping the wisdom of the best experts and the wisest couples (TM)," and
> "Making Honesty easier than ever before."
> Medellin and Bogota: 300 415 5298
> Skype: garykrane
>
> "The greatness of a human is to be measured exactly by the degree to which
> he has helped his/her fellow human."-Gandhi
> "The best things in life are not things" (anon)
>
>
>
>
> --
> Attentamente,
> Gary Krane PhD, CEO/founder Relationship Technologies (ParejasContentas y
> eCoupleCoach)
> "Tapping the wisdom of the best experts and the wisest couples (TM)," and
> "Making Honesty easier than ever before."
> Medellin: 300 415 5298
> Skype: garykrane
>
> "Un ser humano se convierte en una gran exactitud en la medida en la que ?l
> trabaja para el bienestar de sus compa?eros " - Mahatma Gandhi
> "The greatness of a human is to be measured exactly by the degree to which
> he has helped his/her fellow human."-Gandhi
> "The best things in life are not things" (anon)
>
>


-- 
Fabian Hernandez Nieto
http://www.sidesoftware.net
Linux User # 485518
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From pmaupin at gmail.com  Sun Mar 28 12:26:39 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sun, 28 Mar 2010 09:26:39 -0700 (PDT)
Subject: function decorator-like function
References: <9935ff3e-ff2f-44b8-83f4-60883b1512ac@k17g2000yqb.googlegroups.com>
	<90fe2ae8-cf1e-4d89-8b6d-2802874e64b5@e7g2000yqf.googlegroups.com> 
	<c32492f2-3c6c-48a1-9dd4-f7faeed21347@k17g2000yqb.googlegroups.com> 
	<b7dd0538-7300-476c-adfe-8b18b9f1bf9c@g4g2000yqa.googlegroups.com> 
	<40ba11d3-5a18-4da4-a48a-0dd815f3b459@35g2000yqm.googlegroups.com> 
	<1ea8ca8b-b556-44f1-9af8-75e1f60c5fb1@i25g2000yqm.googlegroups.com>
Message-ID: <ed053064-0c6f-4a02-b89d-97f68d7a43ce@d27g2000yqf.googlegroups.com>

On Mar 28, 9:17?am, Michele Simionato <michele.simion... at gmail.com>
wrote:
> Another option is to use my own decorator module (http://
> pypi.python.org/pypi/decorator):
>
> from decorator import decorator
>
> @decorator
> def d(func, *args):
> ? ? print 3
> ? ? return func(*args)
>
> @d
> def f(a, b):
> ? ? print a + b
>
> f(5, 7)

That looks cool (and I'm glad you mentioned it), but it appeared to me
the OP was trying to manually construct the equivalent of a decorator
without the "@" syntax, in order to gain an understanding of how
decorators work, and for this particular purpose, piling additional
magic on top of decorators is probably not helpful :-)

Regards,
Pat


From fhernandezn at gmail.com  Sun Mar 28 12:44:56 2010
From: fhernandezn at gmail.com (Fabian Hernandez)
Date: Sun, 28 Mar 2010 12:44:56 -0400
Subject: OT: Tech Adviser Wanted by Unusual Social Venture Startup AND WEBEX 
	QUESTION
Message-ID: <3be2e7f21003280944i49f4e1a2g6dd199be2e1b3018@mail.gmail.com>

---------- Forwarded message ----------
From: G.Lowell Krane <ecouplecoach at gmail.com>
Date: 2010/3/27
Subject: Fwd: [Off Topic] Tech Adviser Wanted by Unusual Social Venture
Startup AND WEBEX QUESTION
To: Daniel Arbelaez <darbelaez at pragma.com.co>
Cc: arpunk <arpunk at cyberdelic.org>, Fabian Hernandez <fhernandezn at gmail.com>


Here is the ad i am trying to get Python-list to post ASAP--this weekend.

Also, in case one of your best applications is not public, and you want to
demonstrate it, do you prefer webex or what do you prefer?
--gary

---------- Forwarded message ----------
From: G.Lowell Krane <ecouplecoach at gmail.com>
Date: Fri, Mar 26, 2010 at 4:26 PM
Subject: [Off Topic] Tech Adviser Wanted by Unusual Social Venture Startup
To: python-list at python.org


TECH ADVISOR (1-3 hrs/wk) WANTED FOR UNUSUAL SOCIAL VENTURE STARTUP


This position is for an unusual well advanced (though not yet in beta)
Social Venture Internet Startup that has hopefully figured out a way  through
an unusually  robust web application to help the 95% of unhappy couples in
the Western Hemisphere who cannot afford or will not trust a marriage
therapist,  to save, ensure, deepen their relationships (about 60MM
couples!). The monetization model is initially subscriber (very low fee that
mkt research (harris poll) has shown the majority of these in USA, at least
would like to use this for about $20/mo for at least 3 mo or longer as long
as they felt it was helping at least a little.) Our startup, eCoupleCoach
/ParejasContentas, would in fact be the pioneer of this blue ocean market
using a conceptual advance, and employing a social media as well as "tapping
the wisdom of the best experts" model.


Our urgent need now is for someone who is a senior level
developer/programmer to be able to vet three or four of the best  web
application teams we have finally found, or at least the one python team we
found (in Bogota, where I, the ceo/founder/head research psychologist, will
be working with them daily to ensure  maximum efficiency).**

*BTW, anyone who has gone through a tough divorce (or whose parents divorced
at a tender age, will probably find this enormously fascinating and
gratifying?an opportunity to turn your lemons into lemonade.*

Besides the python freelance team ( team, we also have a .net  freelance
team, and  php company . We might identify a 4th soon.  But the priority now
is to vet the python team?one lead developer who has been doing python on
and off (part and fulltime )for several years (but collapsed, 3 years), and
the other developer, about 1 year. The third member of their team is more of
a designer, doing css and html.

After this vetting, we ideally hope, if you are excited about our potential
and yours with us, that you will want to stay on  up to two hours a week (of
course the more you can devote the better if you are interested in any other
challenges) to at least  QA the code quality and make sure it is being
dumped at least weekly.

WHAT WE HAVE GOING FOR US: A lot. Once we hear from you, we will send
detailed backgrounders.

COMPENSATION: would be negotiable and this could also lead to a highly
responsible high up position once we are funded.

TO APPLY: PLEASE email me at eCoupleCoach at gmail.com to make initial contact,
and send us your resume. After this we will
Send you detailed backgrounders on who we are and what we have going for us.

IN YOUR SIGNATURE (so easy to find): Please also indicate your skype contact
info, for follow up phone conversation, unless you prefer chat, in which
case your chat contact info (preferably google), since I am in Colombia now
and will be till the beta is done, though my partner and VP of Product
Development/Project Manager is in NYC.






Gary Krane PhD, CEO/founder Relationship Technologies (ParejasContentas y
eCoupleCoach)
"Tapping the wisdom of the best experts and the wisest couples (TM)," and
"Making Honesty easier than ever before."
Medellin and Bogota: 300 415 5298
Skype: garykrane

"The greatness of a human is to be measured exactly by the degree to which
he has helped his/her fellow human."-Gandhi
"The best things in life are not things" (anon)




-- 
Attentamente,
Gary Krane PhD, CEO/founder Relationship Technologies (ParejasContentas y
eCoupleCoach)
"Tapping the wisdom of the best experts and the wisest couples (TM)," and
"Making Honesty easier than ever before."
Medellin: 300 415 5298
Skype: garykrane

"Un ser humano se convierte en una gran exactitud en la medida en la que ?l
trabaja para el bienestar de sus compa?eros " - Mahatma Gandhi
"The greatness of a human is to be measured exactly by the degree to which
he has helped his/her fellow human."-Gandhi
"The best things in life are not things" (anon)




-- 
Fabian Hernandez Nieto
http://www.sidesoftware.net
Linux User # 485518
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From pmaupin at gmail.com  Sun Mar 28 12:46:07 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sun, 28 Mar 2010 09:46:07 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
Message-ID: <2eb7e099-6ad5-46f0-abe3-4599231f70f5@z4g2000yqa.googlegroups.com>

On Mar 28, 10:17?am, Duncan Booth <duncan.bo... at invalid.invalid>
wrote:
> Doing add-in-place isn't the only way to make sum more efficient: if you
> assume that addition is associative (which of course the builtin sum can't)
> then you can form partial sums. e.g. instead of calculating:
...
>
> Doing it this way helps summing lists or strings (though not as much as
> str.join), but it also helps if you need to sum a long list of similarly
> sized floats as you'll get a more accurate answer.

Also, partial sums would be a clear winner over add-in-place if
someone were dumb^H^H^H^Hnaive enough to use sum() on a long list of
tuples :-)


From alfps at start.no  Sun Mar 28 12:56:26 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Sun, 28 Mar 2010 18:56:26 +0200
Subject: sum for sequences?
In-Reply-To: <94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
Message-ID: <hoo1k4$cia$1@news.eternal-september.org>

* Steve Howell:
> On Mar 28, 8:17 am, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
>> Steve Howell <showel... at yahoo.com> wrote:
>>> The mildly surprising part of sum() is that is does add vs. add-in-
>>> place, which leads to O(N) vs. O(1) for the inner loop calls, for
>>> certain data structures, notably lists, even though none of the
>>> intermediate results get used by the caller.  For lists, you could
>>> make a more efficient variant of sum() that clones the start value and
>>> does add-in-place.
>> Doing add-in-place isn't the only way to make sum more efficient: if you
>> assume that addition is associative (which of course the builtin sum can't)
>> then you can form partial sums. e.g. instead of calculating:
>>
>>   (((((((a + b) + c) + d) + e) + f) + g) + h)
>>
>> you calculate:
>>
>>   (((a + b) + (c + d)) + ((e + f) + (g + h)))
>>
>> Obviously this requires more space than the naive sum, but not as much as
>> you might at first expect: you only need to hold log(n) intermediates
>> values at any time.
>>
> 
> Yep, I did mention in my post that the outer loop does not *have* to
> be O(N), if you can parallelize it.  Apart from reducing
> intermediates, the divide-and-conquer method does not reduce overall
> computation time unless you have multiple processors, correct?
> 

With a single thread of execution it can reduce the time for large integers and 
custom numerical types, with n the number of final bits, from O(n^2) to O(n log n).

I don't think the parallelism here is very relevant for Python.

 From a more practical point of view, the sum efficiency could be improved by 
doing the first addition using '+' and the rest using '+=', without changing the 
behavior.


Cheers & hth.,

- Alf


From showell30 at yahoo.com  Sun Mar 28 13:21:08 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Sun, 28 Mar 2010 10:21:08 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
Message-ID: <88a43c1d-6529-41ea-bdea-21d49d6e2616@v34g2000prd.googlegroups.com>

On Mar 28, 9:56?am, "Alf P. Steinbach" <al... at start.no> wrote:
> * Steve Howell:
>> (talking about summing a list of lists)
>
> ?From a more practical point of view, the sum efficiency could be improved by
> doing the first addition using '+' and the rest using '+=', without changing the
> behavior.

I like that approach, because you don't have to assume that the start
object is clonable, although perhaps you need to make that assumption
anyway for the case where the list is empty.

Here is code that might shed light on Alf's suggested approach:

    import timeit
    M = 10
    N = 8000

    def in_place(
        start = [],
        sublists = ([[None] * M]) * N
        ):
        # only macro-optimized
        i = 0
        for sublist in sublists:
            if i == 0:
               accum = start + sublist
               i += 1
            else:
                accum.extend(sublist)
        if i == 0:
            return 'whatever' # semantics here?
        return accum

    def with_intermediates(
        start = [],
        sublists = ([[None] * M]) * N
        ):
        accum = start
        for sublist in sublists:
            accum = accum + sublist
        return accum

    t1 = timeit.timeit('in_place()', 'from __main__ import in_place',
number=10)
    t2 = timeit.timeit('with_intermediates()', 'from __main__ import
with_intermediates', number=10)
    print M, N, t1, t2, int(t2 / t1)

For N=100, you get a significant speedup (x84):

 10 1000 0.00102496147156 0.0867249965668 84

More data:

 10 1000 0.00102496147156 0.0867249965668 84
 10 2000 0.00211381912231 0.172616004944 81
 10 4000 0.00491786003113 0.561800956726 114
 10 8000 0.0706541538239 19.9019489288 281
 10 16000 0.0161759853363 9.64171791077 596
 10 32000 0.0351569652557 43.98346591 1251



From pmaupin at gmail.com  Sun Mar 28 13:27:38 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sun, 28 Mar 2010 10:27:38 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
Message-ID: <a8c7ba74-1060-445f-9f3d-0cfcf247fd30@q21g2000yqm.googlegroups.com>

On Mar 28, 11:56?am, "Alf P. Steinbach" <al... at start.no> wrote:
> ?From a more practical point of view, the sum efficiency could be improved by
> doing the first addition using '+' and the rest using '+=', without changing the
> behavior.

Mod parent up!!!! :-)


From showell30 at yahoo.com  Sun Mar 28 13:34:13 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Sun, 28 Mar 2010 10:34:13 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<88a43c1d-6529-41ea-bdea-21d49d6e2616@v34g2000prd.googlegroups.com>
Message-ID: <0c76b611-c54f-4474-8f45-d745c53f72d0@k5g2000prg.googlegroups.com>

On Mar 28, 10:21?am, Steve Howell <showel... at yahoo.com> wrote:
> ? ? import timeit
> ? ? M = 10
> ? ? N = 8000
>
> ? ? def in_place(
> ? ? ? ? start = [],
> ? ? ? ? sublists = ([[None] * M]) * N
> ? ? ? ? ):
> ? ? ? ? # only macro-optimized
> ? ? ? ? i = 0
> ? ? ? ? for sublist in sublists:
> ? ? ? ? ? ? if i == 0:
> ? ? ? ? ? ? ? ?accum = start + sublist
> ? ? ? ? ? ? ? ?i += 1
> ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? accum.extend(sublist)

FYI I later obtained similar results with the more general:
                  accum += sublist

> ? ? ? ? if i == 0:
> ? ? ? ? ? ? return 'whatever' # semantics here?
> ? ? ? ? return accum
>
> ? ? def with_intermediates(
> ? ? ? ? start = [],
> ? ? ? ? sublists = ([[None] * M]) * N
> ? ? ? ? ):
> ? ? ? ? accum = start
> ? ? ? ? for sublist in sublists:
> ? ? ? ? ? ? accum = accum + sublist
> ? ? ? ? return accum
>


From pmaupin at gmail.com  Sun Mar 28 14:16:25 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sun, 28 Mar 2010 11:16:25 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<88a43c1d-6529-41ea-bdea-21d49d6e2616@v34g2000prd.googlegroups.com>
	<0c76b611-c54f-4474-8f45-d745c53f72d0@k5g2000prg.googlegroups.com>
Message-ID: <56cb099a-7757-481e-a316-f9655c3ac03c@k13g2000yqe.googlegroups.com>

On Mar 28, 12:34?pm, Steve Howell <showel... at yahoo.com> wrote:
> FYI I later obtained similar results with the more general:
> ? ? ? ? ? ? ? ? ? accum += sublist

Yeah, but you still have to create an object of the correct type for
accum.  And for summing small lists, that will actually increase the
runtime.  (Worst case, a list of a single item: you have to create the
accum object based on the type of the start value, then do two += into
it, for the start value and the first item in the list, vs just doing
a single + which automatically creates an object.)

Personally, I think the most general approach, if sum were open to
enhancements, would be to automatically apply Alf's suggestion of "+"
on summing the first item to the start value, and "+=" on subsequent
items.  Also, you *could* add a parameter to sum(), for example,
default "partialsums=False" that would allow the use of partial sums
in those cases where that might give better behavior (such as floats
and tuples).



From showell30 at yahoo.com  Sun Mar 28 14:50:09 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Sun, 28 Mar 2010 11:50:09 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<88a43c1d-6529-41ea-bdea-21d49d6e2616@v34g2000prd.googlegroups.com>
	<0c76b611-c54f-4474-8f45-d745c53f72d0@k5g2000prg.googlegroups.com> 
	<56cb099a-7757-481e-a316-f9655c3ac03c@k13g2000yqe.googlegroups.com>
Message-ID: <975c7b4e-6c30-40b7-a4da-bcbbeb13e1aa@l5g2000pri.googlegroups.com>

On Mar 28, 11:16?am, Patrick Maupin <pmau... at gmail.com> wrote:
> On Mar 28, 12:34?pm, Steve Howell <showel... at yahoo.com> wrote:
>
> > FYI I later obtained similar results with the more general:
> > ? ? ? ? ? ? ? ? ? accum += sublist
>
> Yeah, but you still have to create an object of the correct type for
> accum. ?

I think you overlooked the surrounding code.

Here is the code again:

    def in_place(
        start = [],
        sublists = ([[None] * M]) * N
        ):
        # only macro-optimized
        i = 0
        for sublist in sublists:
            if i == 0:
               accum = start + sublist
               i += 1
            else:
                accum += sublist
        if i == 0:
            return 'whatever' # semantics here?
        return accum

No need to infer the type.

> And for summing small lists, that will actually increase the
> runtime. ?(Worst case, a list of a single item: you have to create the
> accum object based on the type of the start value, then do two += into
> it, for the start value and the first item in the list, vs just doing
> a single + which automatically creates an object.)
>

For small lists, the performance of any sane implementation would
probably be so fast as to be negligible, unless you are in a really
tight loop.  If you are in a tight loop, then your use case probably
eventually sums large lists.  Even if it doesn't, the slowdown is just
a constant.

For M=5, I get these results on my machine:

M N t1 t2 (t2/t1)
5 1 3.50475311279e-05 3.2901763916e-05 0.938775510204
5 2 2.00271606445e-05 1.59740447998e-05 0.797619047619
5 4 6.79492950439e-05 6.31809234619e-05 0.929824561404
5 8 0.000124931335449 0.000126123428345 1.00954198473
5 64 0.000530958175659 0.00226187705994 4.25999101931
5 1024 0.00262904167175 0.27246594429 103.636981953

t1 = time with add only first element
t2 = time with add all elements

Very small penalty for small lists, very large gain for large lists.

> Personally, I think the most general approach, if sum were open to
> enhancements, would be to automatically apply Alf's suggestion of "+"
> on summing the first item to the start value, and "+=" on subsequent
> items. ?

See above.  That's the approach I would use as well.



From robert.kern at gmail.com  Sun Mar 28 15:03:49 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Sun, 28 Mar 2010 14:03:49 -0500
Subject: Simple Traits Questions
In-Reply-To: <4BAF5DBC.7050909@stoneleaf.us>
References: <4BAE05C6.4070601@stoneleaf.us> <hom7jl$a75$1@dough.gmane.org>
	<4BAF5DBC.7050909@stoneleaf.us>
Message-ID: <hoo97j$k1d$1@dough.gmane.org>

On 2010-03-28 08:46 , Ethan Furman wrote:
> Robert Kern wrote:
>> On 2010-03-27 08:19 , Ethan Furman wrote:
>>
>>> Okay, different post for my actual questions. :)
>>>
>>> On the PyPI page for strait (http://pypi.python.org/pypi/strait/0.5.1)
>>> it has the example of choosing which methods to keep in the composed
>>> class:
>>>
>>> class TOSWidget(BaseWidget):
>>> __metaclass__ = include(Pack, Place, Grid)
>>> info = Pack.info.im_func
>>> config = Pack.config.im_func
>>> configure = Pack.configure.im_func
>>> slaves = Pack.slaves.im_func
>>> forget = Pack.forget.im_func
>>> propagate = Pack.propagate.im_func
>>>
>>> My question is:
>>>
>>> Why use
>>>
>>> info = Pack.info.im_func
>>>
>>> instead of
>>>
>>> info = Pack.info
>>>
>>> ?
>>
>>
>> Pack.info is an unbound method object attached to the Pack class, not
>> a function object. It has some extra semantics on top of functions and
>> is tied to the Pack class. The .im_func attribute gets the actual
>> function object underneath. When defining the TOSWidget class, the
>> objects defined in the suite under the class: statement need to be
>> actual functions in order to be turned into unbound methods attached
>> to the TOSWidget class.
>
> Ah, thank you.
>
> In Python 3, though, would the Pack.info form be correct?

Seems so:

Python 3.1 (r31:73578, Jun 27 2009, 21:49:46)
[GCC 4.0.1 (Apple Inc. build 5493)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
 >>> class Pack():
...   def info(self, x):
...     pass
...
 >>> Pack.info
<function info at 0xe8390>

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From nytrokiss at gmail.com  Sun Mar 28 16:01:38 2010
From: nytrokiss at gmail.com (James Matthews)
Date: Sun, 28 Mar 2010 13:01:38 -0700
Subject: Have you embraced Python 3.x yet?
In-Reply-To: <f3cc57c61003261733k79f996e1w8a02b580e930b65d@mail.gmail.com>
References: <hoicgd$23v0$1@news.telesweet.net>
	<f3cc57c61003261733k79f996e1w8a02b580e930b65d@mail.gmail.com>
Message-ID: <8a6b8e351003281301s121ed942x9847b4fc7d451f0f@mail.gmail.com>

I am still on py 2.6 and since my code is heavy model dependent. I am bound
to the most critical ones. Although I would really like if someone could
backport some new stuff done with the GIL on 3.2 (they had a nice talk about
it at PyCon)

On Fri, Mar 26, 2010 at 5:33 PM, geremy condra <debatem1 at gmail.com> wrote:

> On Fri, Mar 26, 2010 at 9:23 AM, Harishankar <v.harishankar at gmail.com>
> wrote:
> > Have you people embraced Python 3.x or still with 2.5 or 2.6?
> >
> > I personally want to switch over but not too sure how many people are
> > using 3.x as opposed to 2 so I want to keep my programs compatible for
> > the majority.
> >
> > -- Hari
> > --
> > http://mail.python.org/mailman/listinfo/python-list
> >
>
> Yes- I write new code in 3.x and backport it PRN.
>
> Geremy Condra
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
http://www.goldwatches.com

--
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From no.email at nospam.invalid  Sun Mar 28 16:46:40 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Sun, 28 Mar 2010 13:46:40 -0700
Subject: map, index
References: <mOIrn.824$I8.247@news.indigo.ie>
	<Xns9D499780917D2duncanbooth@127.0.0.1>
	<CNJrn.825$I8.401@news.indigo.ie>
Message-ID: <7xeij418en.fsf@ruckus.brouhaha.com>

Luis Quesada <l.quesada at 4c.ucc.ie> writes:
>> [ id*v for id,v in enumerate(L) ]
> Cool! Thanks!

If you really want to write that in pointfree style (untested):

   import itertools, operator
   ...
   itertools.starmap(operator.mul, enumerate(L))

For your other question, you could probably do something ugly
with ifilter, but it's not worth it.  

For the style of programming you're interested in, you should read the
docs for the itertools module.  Python culture in general tends to
not be that fond of heavy use of HOF's, since it's very easy to make
mistakes with its iterator protocol and with its dynamic type system.


From kgo at grant-olson.net  Sun Mar 28 16:46:50 2010
From: kgo at grant-olson.net (Grant Olson)
Date: Sun, 28 Mar 2010 16:46:50 -0400
Subject: ANN: Pyasm version 0.3
Message-ID: <4BAFC03A.8010707@grant-olson.net>

Pyasm is a full-featured dynamic assembler written entirely in Python.
By dynamic, I mean that it can be used to generate and execute machine
code in python at runtime without requiring the generation of object
files and linkage. It essentially allow 'inline' assembly in python
modules on x86 platforms.

In addition, pyasm can generate COFF format object files, which may be
of interest to anyone writing a compiler in python.

More details and downloads are available at:

http://www.grant-olson.net/python/pyasm

The 0.3 release is long overdue.  It includes:

+ A binary installer for python 2.6.  The previous binary installer was
python 2.4.

+ Automatic mapping of python structure values in the assembler.  For
Example, assuming EAX is a pointer to a string, MOV
[EAX+PyString_ob_sval],0x42424242 will change the first four letters of
the string to B's

+ The assembler now supports implicit string creation: PUSH 'foo\n\0'

+ The ability to build and test with the mingw toolset on windows.  This
previously required an MSVC toolset.  Thanks to Markus L?ll for sorting
this out.

-Grant


From no.email at nospam.invalid  Sun Mar 28 16:49:32 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Sun, 28 Mar 2010 13:49:32 -0700
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
Message-ID: <7xaats189v.fsf@ruckus.brouhaha.com>

Steve Howell <showell30 at yahoo.com> writes:
> The documentation is pretty clear on the intention that sum() is
> intended for numbers: ...

I've never been big on the idea of duck-typing addition.  Who would have
thought that (1,2,3)+(4.5.6) was something other than the vector sum?

I think itertools.chain more directly expresses what the OP was trying
to do, and is preferable for readability, independently of these
performance questions.


From philip at semanchuk.com  Sun Mar 28 17:43:46 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Sun, 28 Mar 2010 17:43:46 -0400
Subject: Python Psycopg2 - Interface Error : Connection already closed
In-Reply-To: <c1879e24-b76f-49bb-b7cb-0b7c8274044d@f14g2000pre.googlegroups.com>
References: <c1879e24-b76f-49bb-b7cb-0b7c8274044d@f14g2000pre.googlegroups.com>
Message-ID: <0A52C506-749F-460D-A660-A72BB793A1E2@semanchuk.com>


On Mar 27, 2010, at 5:14 PM, knobbyknees wrote:

> I'm not sure if this is the right group, but I'm hoping it is...
>
> Basically, I'm trying to use pgloader, which depends on python and
> psycopg2.  After banging my head against a wall, I found this:
>
> Found this:
> http://www.mail-archive.com/sqlalchemy at googlegroups.com/msg13209.html
>
> Although, the suggestion didn't work for me at all...
>
> Running this command:
> /usr/bin/pgloader -c /var/mybin/pgconfs/fr.conf
>
> Yields this in the pgloader.log (with the process just hanging)
>
> more /tmp/pgloader.log
> 27-03-2010 12:22:53 pgloader     INFO     Logger initialized
> 27-03-2010 12:22:53 pgloader     INFO     Reformat path is ['/usr/
> share/python-support/pgloader/reformat']
> 27-03-2010 12:22:53 pgloader     INFO     Will consider following
> sections:
> 27-03-2010 12:22:53 pgloader     INFO       fixed
> 27-03-2010 12:22:54 fixed        INFO     fixed processing
> 27-03-2010 12:22:54 pgloader     INFO     All threads are started,
> wait for them to terminate
> 27-03-2010 12:22:57 fixed        ERROR    connection already closed
> 27-03-2010 12:22:57 fixed        INFO     closing current database
> connection
>
> [pgsql]
> host                  = localhost
> port                  = 5432
> base                  = frdb
> user                  = username
> pass                  = password
>
>
> [fixed]
> table                 = fr
> format                = fixed
> filename              = /var/www/fr.txt
> ...
>
>
> This is what I see for the traceback:
> Traceback (most recent call last):
>  File "/usr/lib/python2.6/threading.py", line 525, in
> __bootstrap_inner
>    self.run()
>  File "/usr/lib/pymodules/python2.6/pgloader/pgloader.py", line 847,
> in run
>    self.terminate()
>  File "/usr/lib/pymodules/python2.6/pgloader/pgloader.py", line 874,
> in terminate
>    self.db.close()
>  File "/usr/lib/pymodules/python2.6/pgloader/db.py", line 103, in
> close
>    self.dbconn.close()
>
>
> I'm at a total loss here....  Can anyone please help me out?

Hi knobbyknees,
I can't help you with this problem, but the folks on the psycopg2  
mailing list are probably a much better crowd to ask:
http://lists.initd.org/mailman/listinfo/psycopg


Good luck
Philip


From tjreedy at udel.edu  Sun Mar 28 18:06:21 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 28 Mar 2010 18:06:21 -0400
Subject: Simple Traits Questions
In-Reply-To: <4BAF5DBC.7050909@stoneleaf.us>
References: <4BAE05C6.4070601@stoneleaf.us> <hom7jl$a75$1@dough.gmane.org>
	<4BAF5DBC.7050909@stoneleaf.us>
Message-ID: <hoojsq$m9b$1@dough.gmane.org>

On 3/28/2010 9:46 AM, Ethan Furman wrote:
> Robert Kern wrote:
>> On 2010-03-27 08:19 , Ethan Furman wrote:
>>
>>> Okay, different post for my actual questions. :)
>>>
>>> On the PyPI page for strait (http://pypi.python.org/pypi/strait/0.5.1)
>>> it has the example of choosing which methods to keep in the composed
>>> class:
>>>
>>> class TOSWidget(BaseWidget):
>>> __metaclass__ = include(Pack, Place, Grid)
>>> info = Pack.info.im_func
>>> config = Pack.config.im_func
>>> configure = Pack.configure.im_func
>>> slaves = Pack.slaves.im_func
>>> forget = Pack.forget.im_func
>>> propagate = Pack.propagate.im_func
>>>
>>> My question is:
>>>
>>> Why use
>>>
>>> info = Pack.info.im_func
>>>
>>> instead of
>>>
>>> info = Pack.info
>>>
>>> ?
>>
>>
>> Pack.info is an unbound method object attached to the Pack class, not
>> a function object. It has some extra semantics on top of functions and
>> is tied to the Pack class. The .im_func attribute gets the actual
>> function object underneath. When defining the TOSWidget class, the
>> objects defined in the suite under the class: statement need to be
>> actual functions in order to be turned into unbound methods attached
>> to the TOSWidget class.
>
> Ah, thank you.
>
> In Python 3, though, would the Pack.info form be correct?

Yes. One of the simplifications of Py3.



From l.quesada at 4c.ucc.ie  Sun Mar 28 18:14:31 2010
From: l.quesada at 4c.ucc.ie (Luis Quesada)
Date: Sun, 28 Mar 2010 23:14:31 +0100
Subject: map, index
In-Reply-To: <7xeij418en.fsf@ruckus.brouhaha.com>
References: <mOIrn.824$I8.247@news.indigo.ie>	<Xns9D499780917D2duncanbooth@127.0.0.1>	<CNJrn.825$I8.401@news.indigo.ie>
	<7xeij418en.fsf@ruckus.brouhaha.com>
Message-ID: <9xQrn.826$I8.164@news.indigo.ie>

Paul Rubin wrote:
> Luis Quesada <l.quesada at 4c.ucc.ie> writes:
>>> [ id*v for id,v in enumerate(L) ]
>> Cool! Thanks!
> 
> If you really want to write that in pointfree style (untested):
> 
>    import itertools, operator
>    ...
>    itertools.starmap(operator.mul, enumerate(L))
> 
> For your other question, you could probably do something ugly
> with ifilter, but it's not worth it.  
> 
> For the style of programming you're interested in, you should read the
> docs for the itertools module.  Python culture in general tends to
> not be that fond of heavy use of HOF's, since it's very easy to make
> mistakes with its iterator protocol and with its dynamic type system.
Thanks a lot for the pointer.
Python is rather cool indeed.
Cheers,
Luis


From tdelaney at avaya.com  Sun Mar 28 20:58:07 2010
From: tdelaney at avaya.com (Delaney, Timothy (Tim))
Date: Mon, 29 Mar 2010 08:58:07 +0800
Subject: Super() function
In-Reply-To: <4BAE359F.6090200@googlemail.com>
References: <4BAAD5E0.9050604@googlemail.com><op.u93uq1jyx6zn5v@gabriel.sleipnir-bsas>
	<4BAE359F.6090200@googlemail.com>
Message-ID: <E4C7BCAB1872014F81CEAACD25699B8C01A49E87@301081ANEX2.global.avaya.com>

> Gabriel Genellina wrote:
>> Alan Harris-Reid <aharrisreid at googlemail.com> escribi?:
>>
>>> Using Python 3.1, I sometimes use the super() function to call the 
>>> equivalent method from a parent class, for example
>>>
>>> def mymethod(self):
>>>     super().mymethod()
>>>     some more code...
>>>
>>> Is there any way of writing the code so that the super() call is 
>>> generic and automatically recognises the name of the current method 
>>> (ie. something like super().thismethod()) or do I always have to 
>>> repeat the method name after super()?
>>
>> This recipe does what you want:
>> http://code.activestate.com/recipes/286195-selfsuper/
>> (but requires a bit of black magic...)
>>
> Hi Gabriel - thanks for the reply.
>
> Goodness me - that's a mighty complicated recipe for what I want to achieve!
> I think I'll stick with repeating the method name - it's a small price to pay.

I wrote that recipe back before Python 3.x supported super() without parameters,
and near equivalent functionality was part of the new super PEP as an option.
However, Guido decided to go with the much simpler super().attr with no shortcutting.

If you think the pure-python version of the recipe is complicated, you should have
a look at the performance-optimised Pyrex version ;)

Tim Delaney


From steven at REMOVE.THIS.cybersource.com.au  Sun Mar 28 21:34:54 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 29 Mar 2010 01:34:54 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<7xaats189v.fsf@ruckus.brouhaha.com>
Message-ID: <pan.2010.03.29.01.34.54@REMOVE.THIS.cybersource.com.au>

On Sun, 28 Mar 2010 13:49:32 -0700, Paul Rubin wrote:

> Steve Howell <showell30 at yahoo.com> writes:
>> The documentation is pretty clear on the intention that sum() is
>> intended for numbers: ...
> 
> I've never been big on the idea of duck-typing addition.  Who would have
> thought that (1,2,3)+(4.5.6) was something other than the vector sum?

But your arguments are tuples, not vectors.

There are languages which do treat arithmetic operations on vectors as 
vector operations, as do (e.g.) H-P scientific calculators. That's a fine 
design choice, and it works for languages where the emphasis is on 
scientific calculations. But Python is a more generalist language, so in 
my mind it is more appropriate to treat lists as generic lists, and not 
numeric vectors:

[1, 2, 3] + [4, "a"] => [1, 2, 3, 4, "a"]

just as

"123" + "4a" => "1234a"



-- 
Steven


From keith at nekotaku.com  Sun Mar 28 22:14:19 2010
From: keith at nekotaku.com (KB)
Date: Sun, 28 Mar 2010 19:14:19 -0700 (PDT)
Subject: pythoncom.CoInitialize() not recognised in Eclipse
Message-ID: <4558b9a2-9d1c-4ec2-b564-9219be6443f2@w39g2000prd.googlegroups.com>

Hi there,

I have in the past used PythonWin to write python for COM, and
switched to Eclipse.

I am getting an error from the IDE saying it does not recognise
CoInitialize():

****
import pythoncom

pythoncom.CoInitialize()
pythoncom.CoUninitialize()
****

(red X next to the two bottom lines saying: "Undefined variable from
import: CoInitialize")

If I open a PyDev/Python Console window in Eclipse, I can type the
above, no errors, no problem.

I tried removing my Python Interpreter and re-adding/re-building but
no change.

python 2.5.2
eclipse 3.5.1
pydev 1.5.0

Thanks!



From ysj.ray at gmail.com  Sun Mar 28 22:25:50 2010
From: ysj.ray at gmail.com (Ray Allen)
Date: Mon, 29 Mar 2010 10:25:50 +0800
Subject: Have you embraced Python 3.x yet?
In-Reply-To: <8a6b8e351003281301s121ed942x9847b4fc7d451f0f@mail.gmail.com>
References: <hoicgd$23v0$1@news.telesweet.net>
	<f3cc57c61003261733k79f996e1w8a02b580e930b65d@mail.gmail.com>
	<8a6b8e351003281301s121ed942x9847b4fc7d451f0f@mail.gmail.com>
Message-ID: <797c8cbd1003281925q31217cb9q8436a8fe20388ac0@mail.gmail.com>

  In our company, we still use python-2.5.4, and will be updated to
python-2.5.5. I hope we can go to 2.6.x or 3.x, but I'm not sure when.
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From steven at REMOVE.THIS.cybersource.com.au  Sun Mar 28 22:45:32 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 29 Mar 2010 02:45:32 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
Message-ID: <pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>

On Sun, 28 Mar 2010 18:56:26 +0200, Alf P. Steinbach wrote:

> From a more practical point of view, the sum efficiency could be
> improved by doing the first addition using '+' and the rest using '+=',
> without changing the behavior.

But that would change the behaviour. The __iadd__ method is not the same 
as the __add__ method, and you can't guarantee that they will behave the 
same -- or even similarly.

And what about tuples? And subclasses of list/tuples? How many different 
types need to be optimized?

In practical terms, does anyone actually ever use sum on more than a 
handful of lists? I don't believe this is more than a hypothetical 
problem.

The primary use case for sum is adding numbers when floating point 
accuracy is not critical. If you need float accuracy, use math.fsum. If 
you need to add more than a handful of small lists, don't use sum: just 
calling extend in a loop is probably fast enough, or use itertools.chain. 
Trying to turn sum into an all-singing all-dancing function optimised for 
an ever-increasing number of objects is a fool's errand. The 
implementation of sum in C is already complex enough: 95 lines, excluding 
comments, blanks and braces, for something which is a lightweight 
function with very simple semantics.

But if anyone wants to submit a patch to the bug tracker, go right ahead. 
Without a patch though, I'd say that Python-Dev will consider this a non-
issue.



-- 
Steven


From jason.scheirer at gmail.com  Sun Mar 28 23:16:43 2010
From: jason.scheirer at gmail.com (Jason Scheirer)
Date: Sun, 28 Mar 2010 20:16:43 -0700 (PDT)
Subject: pythoncom.CoInitialize() not recognised in Eclipse
References: <4558b9a2-9d1c-4ec2-b564-9219be6443f2@w39g2000prd.googlegroups.com>
Message-ID: <03f8158f-cc4e-4e98-a45a-d0749030e877@w29g2000prg.googlegroups.com>

On Mar 28, 7:14?pm, KB <ke... at nekotaku.com> wrote:
> Hi there,
>
> I have in the past used PythonWin to write python for COM, and
> switched to Eclipse.
>
> I am getting an error from the IDE saying it does not recognise
> CoInitialize():
>
> ****
> import pythoncom
>
> pythoncom.CoInitialize()
> pythoncom.CoUninitialize()
> ****
>
> (red X next to the two bottom lines saying: "Undefined variable from
> import: CoInitialize")
>
> If I open a PyDev/Python Console window in Eclipse, I can type the
> above, no errors, no problem.
>
> I tried removing my Python Interpreter and re-adding/re-building but
> no change.
>
> python 2.5.2
> eclipse 3.5.1
> pydev 1.5.0
>
> Thanks!

PyDev is probably only looking at functions/classes defined in Python
source files and not ones defined in C extensions.

To confirm, try typing this in the window:

import _ctypes
_ctypes._Pointer()

If it says that _ctypes._Pointer doesn't exist, then that's obviously
the problem.


From dieterv at optionexplicit.be  Mon Mar 29 01:59:24 2010
From: dieterv at optionexplicit.be (Dieter Verfaillie)
Date: Mon, 29 Mar 2010 07:59:24 +0200
Subject: pythoncom.CoInitialize() not recognised in Eclipse
In-Reply-To: <4558b9a2-9d1c-4ec2-b564-9219be6443f2@w39g2000prd.googlegroups.com>
References: <4558b9a2-9d1c-4ec2-b564-9219be6443f2@w39g2000prd.googlegroups.com>
Message-ID: <20100329075924.64164i05fobzkdrw@webmail.linuxsystems.be>

Quoting KB <keith at nekotaku.com>:
> I am getting an error from the IDE saying it does not recognise
> CoInitialize():
>
> ****
> import pythoncom
>
> pythoncom.CoInitialize()
> pythoncom.CoUninitialize()
> ****

It works out of the box with PyDev 1.5.5.2010030420 on Eclipse 3.5.2  
on Windows XP. If nothing seems to work for you, you could try adding  
pythoncom to the
"Forced Builtins" tab of your Python interpreter configuration to see if it
helps (restart eclipse after you've done that, sometimes changes to  
the symbols
database don't get picked up without restarting eclipse...)

mvg,
Dieter

----------------------------------------------------------------
This message was sent using IMP, the Internet Messaging Program.



From gaoxtwarrior at gmail.com  Mon Mar 29 02:42:41 2010
From: gaoxtwarrior at gmail.com (Gao)
Date: Mon, 29 Mar 2010 14:42:41 +0800
Subject: How to verify a signature using SHA1WithRSA with python
Message-ID: <hopi51$2dq$1@www.shinco.com>

I have a public key, and I want to write a method that verify a string 
which is a signature signed by this public key's private key. And is 
M2Crypto I can't find algorithm named "SHA1WithRSA" or so . Could anyone 
help me?


From alfps at start.no  Mon Mar 29 03:34:07 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Mon, 29 Mar 2010 09:34:07 +0200
Subject: sum for sequences?
In-Reply-To: <pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
References: <hodb43$pt$1@reader1.panix.com>	<7x1vf91f60.fsf@ruckus.brouhaha.com>	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
Message-ID: <hopl1p$iga$1@news.eternal-september.org>

* Steven D'Aprano:
> On Sun, 28 Mar 2010 18:56:26 +0200, Alf P. Steinbach wrote:
> 
>> From a more practical point of view, the sum efficiency could be
>> improved by doing the first addition using '+' and the rest using '+=',
>> without changing the behavior.
> 
> But that would change the behaviour. The __iadd__ method is not the same 
> as the __add__ method, and you can't guarantee that they will behave the 
> same -- or even similarly.

Hm, I don't think it's documented (except if the reference implementation serves 
as documentation) which one is currently used.


> And what about tuples? And subclasses of list/tuples? How many different 
> types need to be optimized?

Point. One would need to check for availability of '+='.


> In practical terms, does anyone actually ever use sum on more than a 
> handful of lists? I don't believe this is more than a hypothetical 
> problem.

Agreed.


Cheers,

- Alf


From vamsi2123.vgn at gmail.com  Mon Mar 29 03:37:44 2010
From: vamsi2123.vgn at gmail.com (vamsi.v)
Date: Mon, 29 Mar 2010 13:07:44 +0530
Subject: header intact
Message-ID: <da7afd81003290037i1ed2cceue0288a1fa9570cdc@mail.gmail.com>

>
>    confirm bec6a35eaf702fee07b1542f90784d939bbbebff
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20100329/a054b207/attachment.html>

From greg.ewing at canterbury.ac.nz  Mon Mar 29 03:41:23 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Mon, 29 Mar 2010 19:41:23 +1200
Subject: GIF89A and PIL
In-Reply-To: <2010032719445464825-aptshansen@gmailinvalid>
References: <2010032618455468300-aptshansen@gmailinvalid>
	<87oci9hjz9.fsf@dpt-info.u-strasbg.fr>
	<2010032719445464825-aptshansen@gmailinvalid>
Message-ID: <81b39uFggeU1@mid.individual.net>

Stephen Hansen wrote:

> So I wonder if there's just some hyper-optimization Photoshop does that 
> PIL can't round-trip.

You may find that PIL isn't bothering to compress at all,
or only doing it in a very simpleminded way.

-- 
Greg


From stephane at harobed.org  Mon Mar 29 04:12:09 2010
From: stephane at harobed.org (=?windows-1252?Q?St=E9phane_Klein?=)
Date: Mon, 29 Mar 2010 10:12:09 +0200
Subject: =?windows-1252?Q?I=27m_looking_for_html_cleaner=2E_Exa?=
	=?windows-1252?Q?mple_=3A_convert_=3Ch1=3E=3Cspan=3E=3Cfont=3Emy_?=
	=?windows-1252?Q?title=3C/font=3E=3C/span=3E=3C/h1=3E_=3D=3E_=3Ch1=3E?=
	=?windows-1252?Q?my_title=3C/h1=3E=85?=
Message-ID: <hopncq$gqk$1@dough.gmane.org>

Hi,

I work on HTML cleaner.

I export OpenOffice.org documents to HTML.
Next, I would like clean this HTML export files :

* remove comment
* remove style
* remove dispensable tag
* ...

some difficulty :

* convert <p>my text <span>foo</span> bar</p> => <p>my text foo par</p>
* convert <h1><span><font>my title</font></span></h1> => <h1>my title</h1>

to do this process, I use lxml and pyquery.

Question :

* are there some xml helper tools in Python to do this process ? I've 
looked for in pypi, I found nothing about it

If you confirm than this tools don't exists, I'll maybe publish a helper 
package to do this "clean" processing.

Thanks for your help,
Stephane



From v.harishankar at gmail.com  Mon Mar 29 05:09:42 2010
From: v.harishankar at gmail.com (Harishankar)
Date: Mon, 29 Mar 2010 09:09:42 +0000 (UTC)
Subject: I'm looking for html cleaner. Example : convert
	<h1><span><font>my title</font></span></h1> => <h1>my
	=?windows-1251?q?title=3C=2Fh1=3E=85?=
References: <mailman.1284.1269850345.23598.python-list@python.org>
Message-ID: <hopqom$2nn3$1@news.telesweet.net>

On Mon, 29 Mar 2010 10:12:09 +0200, St?phane Klein wrote:

> Hi,
> 
> I work on HTML cleaner.
> 
> I export OpenOffice.org documents to HTML. Next, I would like clean this
> HTML export files :
> 
> * remove comment
> * remove style
> * remove dispensable tag
> * ...
> 
> some difficulty :
> 
> * convert <p>my text <span>foo</span> bar</p> => <p>my text foo par</p>
> * convert <h1><span><font>my title</font></span></h1> => <h1>my
> title</h1>
> 
> to do this process, I use lxml and pyquery.
> 
> Question :
> 
> * are there some xml helper tools in Python to do this process ? I've
> looked for in pypi, I found nothing about it
> 
> If you confirm than this tools don't exists, I'll maybe publish a helper
> package to do this "clean" processing.
> 
> Thanks for your help,
> Stephane


Take a look at htmllib and HTMLParser (two different modules) in the 
Python built-in library.

In Python 3.x there is one called html.parser

You can use this to parse out specific tags from HTML documents. If you 
want something more advanced, consider using XML.





-- 
Harishankar (http://harishankar.org http://literaryforums.org)


From pieter.cogghe at gmail.com  Mon Mar 29 05:39:05 2010
From: pieter.cogghe at gmail.com (Yuccaplant)
Date: Mon, 29 Mar 2010 02:39:05 -0700 (PDT)
Subject: refer to self in a decorator on a class method
Message-ID: <baa34bdb-3ce8-4b8e-8b13-44f6b9611f72@z3g2000yqz.googlegroups.com>

Hi all,

I would like to do something like this:

********************
class HelloWorld (object):

    def __init__(self,clk):
        self.clk = clk

    @always(self.clk.posedge)
    def sayHello(self):
        print "%s Hello World!" % now()
********************

Problem is however I can't refer to self in the decorator call. Is
there any workarround?

thanks a lot,

pieter


From __peter__ at web.de  Mon Mar 29 05:53:51 2010
From: __peter__ at web.de (Peter Otten)
Date: Mon, 29 Mar 2010 11:53:51 +0200
Subject: refer to self in a decorator on a class method
References: <baa34bdb-3ce8-4b8e-8b13-44f6b9611f72@z3g2000yqz.googlegroups.com>
Message-ID: <hopta3$p0c$00$1@news.t-online.com>

Yuccaplant wrote:

> Hi all,
> 
> I would like to do something like this:
> 
> ********************
> class HelloWorld (object):
> 
>     def __init__(self,clk):
>         self.clk = clk
> 
>     @always(self.clk.posedge)
>     def sayHello(self):
>         print "%s Hello World!" % now()
> ********************
> 
> Problem is however I can't refer to self in the decorator call. Is
> there any workarround?

Pass attribute names:

>>> def always(name):
...     def always(f):
...             def wrapper(self, *args, **kw):
...                     print attrgetter(name)(self)
...                     return f(self, *args, **kw)
...             return wrapper
...     return always
...
>>> from operator import attrgetter
>>> class A(object):
...     def __init__(self, clk):
...             self.clk = clk
...     @always("clk.posedge")
...     def hello(self):
...             print "hello world"
...
>>> class clk:
...     posedge = 42
...
>>> A(clk).hello()
42
hello world

There may be better ways depending on your usecase.

Peter


From cournape at gmail.com  Mon Mar 29 06:06:53 2010
From: cournape at gmail.com (David Cournapeau)
Date: Mon, 29 Mar 2010 19:06:53 +0900
Subject: Have you embraced Python 3.x yet?
In-Reply-To: <7f014ea61003261326g3be655d8oefc1f710a6f7ae91@mail.gmail.com>
References: <hoicgd$23v0$1@news.telesweet.net>
	<195c7315-85cc-412d-8ef5-f13314aecaae@33g2000yqj.googlegroups.com>
	<7f014ea61003261326g3be655d8oefc1f710a6f7ae91@mail.gmail.com>
Message-ID: <5b8d13221003290306n7580c5dey8111071fbb4c073c@mail.gmail.com>

On Sat, Mar 27, 2010 at 5:26 AM, Chris Colbert <sccolbert at gmail.com> wrote:

>
> I won't switch until NumPy and SciPy make the jump.

We're almost there, though (mostly thanks to other people's work on Numpy):

http://github.com/cournape/scipy3/branches/py3k

David


From dr.mtarver at ukonline.co.uk  Mon Mar 29 06:46:10 2010
From: dr.mtarver at ukonline.co.uk (Mark Tarver)
Date: Mon, 29 Mar 2010 03:46:10 -0700 (PDT)
Subject: the Python Foundation
References: <70db60af-cad4-4385-b199-e181f1e39898@b7g2000yqd.googlegroups.com>
	<mailman.1159.1269465542.23598.python-list@python.org>
Message-ID: <63099700-c0a0-4d9c-b1f1-e872fe52f0cf@y17g2000yqd.googlegroups.com>

On 24 Mar, 22:18, "Steve Holden, Chairman, PSF" <chair... at python.org>
wrote:
> MarkTarver wrote:
> >>From the website
>
> > The Python Software Foundation (PSF) is a 501(c)(3) non-profit
> > corporation that
> > holds the intellectual property rights behind the Python programming
> > language. We manage the open source licensing for Python version 2.1
> > and later and own and protect the trademarks associated with Python.
>
> > Could somebody explain 'what holding the intellectual property rights'
> > means in this context and in what sense PSF manages the licensing and
> > protects the trademarks associated with Python? ? This is for my
> > education.
>
> The PSF requires that contributors sign an agreement licensing their
> code to us, and allowing us to distribute it under the license of our
> choosing (this does not in any way preclude the contributor licensing
> the same code to any other party under different terms).
>
> In this way people who use Python can be relatively sure that the code
> is untrammeled by claims of copyright or patent by anyone other than the
> PSF, and can therefore use it without fear of losing their rights to do
> so because of legal action by third parties.
>
> We have also registered the trademark "Python" for use in reference to
> computer programming languages, thereby ensuring that we can take action
> should some ill-advised individual or organization decide to produce
> another language with "Python" in its name which we did not feel
> conformed sufficiently strictly to the language definition, for instance.
>
> The PSF has an established policy with regard to the use of its
> trademarks, which you can read at
>
> ?http://www.python.org/psf/trademarks/
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?Chairman, Python Software Foundation
> See PyCon Talks from Atlanta 2010 ?http://pycon.blip.tv/
> Holden Web LLC ? ? ? ? ? ? ? ?http://www.holdenweb.com/
> UPCOMING EVENTS: ? ? ? ?http://holdenweb.eventbrite.com/

Thankyou to all on this thread for this clarification.  I may return
and ask some questions if I need further clarification.

Mark


From pon at iki.fi  Mon Mar 29 07:13:49 2010
From: pon at iki.fi (Pasi Oja-Nisula)
Date: 29 Mar 2010 11:13:49 GMT
Subject: Python magazine
Message-ID: <slrnhr0unj.if3.pon@seepia.dyndns.org>

Python magazine web site says this:
"So, sit back and relax - enjoy your holidays, and come see us again on
January 26th, when the new  PyMag will launch."

Anyone heard any rumours or anything? I quite liked the magazine.

Pasi


From 1234567890 at vanwingerde.net  Mon Mar 29 08:11:57 2010
From: 1234567890 at vanwingerde.net (Jaap van Wingerde)
Date: Mon, 29 Mar 2010 05:11:57 -0700 (PDT)
Subject: Python magazine
References: <slrnhr0unj.if3.pon@seepia.dyndns.org>
Message-ID: <88f34d4c-b620-4d8e-9e02-4c42384735b6@35g2000yqm.googlegroups.com>

On 29 mrt, 13:13, Pasi Oja-Nisula <p... at iki.fi> wrote:
> Python magazine web site says this:
> "So, sit back and relax - enjoy your holidays, and come see us again on
> January 26th, when the new ?PyMag will launch."
<http://rhodesmill.org/brandon/2010/leaving-python-magazine/>



From ben+python at benfinney.id.au  Mon Mar 29 08:43:29 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Mon, 29 Mar 2010 23:43:29 +1100
Subject: Have you embraced Python 3.x yet?
References: <hoicgd$23v0$1@news.telesweet.net>
	<195c7315-85cc-412d-8ef5-f13314aecaae@33g2000yqj.googlegroups.com>
	<7f014ea61003261326g3be655d8oefc1f710a6f7ae91@mail.gmail.com>
	<mailman.1285.1269857215.23598.python-list@python.org>
Message-ID: <878w9bnvri.fsf@benfinney.id.au>

David Cournapeau <cournape at gmail.com> writes:

> On Sat, Mar 27, 2010 at 5:26 AM, Chris Colbert <sccolbert at gmail.com> wrote:
> > I won't switch until NumPy and SciPy make the jump.
>
> We're almost there, though (mostly thanks to other people's work on
> Numpy):
>
> http://github.com/cournape/scipy3/branches/py3k

Are you maintaining separate parallel Python 3 versus Python 2 code
bases? If not, what are you doing in that regard?

-- 
 \      ?The most common way people give up their power is by thinking |
  `\                               they don't have any.? ?Alice Walker |
_o__)                                                                  |
Ben Finney


From cournape at gmail.com  Mon Mar 29 08:58:17 2010
From: cournape at gmail.com (David Cournapeau)
Date: Mon, 29 Mar 2010 21:58:17 +0900
Subject: Have you embraced Python 3.x yet?
In-Reply-To: <878w9bnvri.fsf@benfinney.id.au>
References: <hoicgd$23v0$1@news.telesweet.net>
	<195c7315-85cc-412d-8ef5-f13314aecaae@33g2000yqj.googlegroups.com>
	<7f014ea61003261326g3be655d8oefc1f710a6f7ae91@mail.gmail.com>
	<mailman.1285.1269857215.23598.python-list@python.org>
	<878w9bnvri.fsf@benfinney.id.au>
Message-ID: <5b8d13221003290558w18fa6c94s4605189382148366@mail.gmail.com>

On Mon, Mar 29, 2010 at 9:43 PM, Ben Finney <ben+python at benfinney.id.au> wrote:
> David Cournapeau <cournape at gmail.com> writes:
>
>> On Sat, Mar 27, 2010 at 5:26 AM, Chris Colbert <sccolbert at gmail.com> wrote:
>> > I won't switch until NumPy and SciPy make the jump.
>>
>> We're almost there, though (mostly thanks to other people's work on
>> Numpy):
>>
>> http://github.com/cournape/scipy3/branches/py3k
>
> Are you maintaining separate parallel Python 3 versus Python 2 code
> bases?

No, we don't have the manpower to have two code bases - the C code
handles both versions, and the python 2 code is converted to python 3
"on the fly".

We are lucky not to have too much IO / string handling, which are the
hard things to handle with 2to3. The hard part was NumPy, because it
used the python C api so much. Porting scipy to something somewhat
usable was an half-day job,

cheers,

David


From wolftracks at invalid.com  Mon Mar 29 09:04:17 2010
From: wolftracks at invalid.com (W. eWatson)
Date: Mon, 29 Mar 2010 06:04:17 -0700
Subject: Why this Difference in Importing NumPy 1.2 vs 1.4?
In-Reply-To: <honvk7$thl$1@news.eternal-september.org>
References: <honvk7$thl$1@news.eternal-september.org>
Message-ID: <hoq8gi$krt$1@news.eternal-september.org>

Add/Remove under Control Panel. It's a numpy problem.

On 3/28/2010 9:20 AM, W. eWatson wrote:
> I wrote a program in Python 2.5 under Win7 and it runs fine using Numpy
> 1.2 , but not on a colleague's machine who has a slightly newer 2.5 and
> uses NumPy 1.4. We both use IDLE to execute the program. During import
> he gets this:
>
>  >>>
> Traceback (most recent call last):
> File "C:\Documents and Settings\HP_Administrator.DavesDesktop\My
> Documents\Astro\Meteors\NC-FireballReport.py", line 38, in <module>
> from scipy import stats as stats # scoreatpercentile
> File "C:\Python25\lib\site-packages\scipy\stats\__init__.py", line 7, in
> <module>
> from stats import *
> File "C:\Python25\lib\site-packages\scipy\stats\stats.py", line 191, in
> <module>
> import scipy.special as special
> File "C:\Python25\lib\site-packages\scipy\special\__init__.py", line 22,
> in <module>
> from numpy.testing import NumpyTest
> ImportError: cannot import name NumpyTest
>  >>>
>
> Comments?
>
> It looks as though the problem is in NumPy 1.4. If it's either in NumPy
> or SciPy, how does my colleague back out to an earlier version to agree
> with mine? Does he just pull down 1.3 or better 1.2 (I use it.), and
> install it? How does he somehow remove 1.4? Is it as easy as going to
> IDLE's path browser and removing, under site-packages, numpy? (I'm not
> sure that's even possible. I don't see a right-click menu.)



From slais-www at ucl.ac.uk  Mon Mar 29 09:09:48 2010
From: slais-www at ucl.ac.uk (djc)
Date: Mon, 29 Mar 2010 14:09:48 +0100
Subject: OT: Meaning of "monkey"
In-Reply-To: <e684e6ae-be88-4d2b-8447-733f3a10d882@z11g2000yqz.googlegroups.com>
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
	<6eca52f7-0a55-4c96-8144-9face3c88124@15g2000yqi.googlegroups.com>
	<e684e6ae-be88-4d2b-8447-733f3a10d882@z11g2000yqz.googlegroups.com>
Message-ID: <hoq8qs$9k5m$1@uns-a.ucl.ac.uk>

Mensanator wrote:
> On Mar 26, 2:44 pm, Phlip <phlip2... at gmail.com> wrote:
>> On Mar 26, 6:14 am, Luis M. Gonz?lez <luis... at gmail.com> wrote:
>>
>>> Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
>>> Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
>>> Monkeys everywhere.
>>> Sorry for the off topic question, but what does "monkey" mean in a
>>> nerdy-geek context??
>>> Luis
>> Better at typing than thinking.
> 
> Really? I thought it was more of a reference to Eddington, i.e., given
> enough time even a monkey can type out a program.


Precisely, given infinite typing and zero thinking...

Note also the expression 'talk to the organ  grinder not the monkey'

and 'a trained monkey could do it'

and then there are monkey wrenches, and monkey bikes...

and never call the Librarian a monkey


-- 
David Clark, MSc, PhD.              UCL Centre for Publishing
                                    Gower Str London WCIE 6BT
What sort of web animal are you?
            <https://www.bbc.co.uk/labuk/experiments/webbehaviour>


From bruno.42.desthuilliers at websiteburo.invalid  Mon Mar 29 09:22:06 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Mon, 29 Mar 2010 15:22:06 +0200
Subject: OT: Meaning of "monkey"
In-Reply-To: <hoq8qs$9k5m$1@uns-a.ucl.ac.uk>
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
	<6eca52f7-0a55-4c96-8144-9face3c88124@15g2000yqi.googlegroups.com>
	<e684e6ae-be88-4d2b-8447-733f3a10d882@z11g2000yqz.googlegroups.com>
	<hoq8qs$9k5m$1@uns-a.ucl.ac.uk>
Message-ID: <4bb0a951$0$11311$426a34cc@news.free.fr>

djc a ?crit :
>
> and never call the Librarian a monkey

ook ?!?


From krister.svanlund at gmail.com  Mon Mar 29 09:32:08 2010
From: krister.svanlund at gmail.com (Krister Svanlund)
Date: Mon, 29 Mar 2010 15:32:08 +0200
Subject: OT: Meaning of "monkey"
In-Reply-To: <hoq8qs$9k5m$1@uns-a.ucl.ac.uk>
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
	<6eca52f7-0a55-4c96-8144-9face3c88124@15g2000yqi.googlegroups.com>
	<e684e6ae-be88-4d2b-8447-733f3a10d882@z11g2000yqz.googlegroups.com>
	<hoq8qs$9k5m$1@uns-a.ucl.ac.uk>
Message-ID: <2cf430a61003290632k1e40eb81r38e8b0a67d6eb3a8@mail.gmail.com>

On Mon, Mar 29, 2010 at 3:09 PM, djc <slais-www at ucl.ac.uk> wrote:
> Mensanator wrote:
>> On Mar 26, 2:44 pm, Phlip <phlip2... at gmail.com> wrote:
>>> On Mar 26, 6:14 am, Luis M. Gonz?lez <luis... at gmail.com> wrote:
>>>
>>>> Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
>>>> Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
>>>> Monkeys everywhere.
>>>> Sorry for the off topic question, but what does "monkey" mean in a
>>>> nerdy-geek context??
>>>> Luis
>>> Better at typing than thinking.
>>
>> Really? I thought it was more of a reference to Eddington, i.e., given
>> enough time even a monkey can type out a program.
>
>
> Precisely, given infinite typing and zero thinking...
>
> Note also the expression 'talk to the organ ?grinder not the monkey'
>
> and 'a trained monkey could do it'
>
> and then there are monkey wrenches, and monkey bikes...
>
> and never call the Librarian a monkey
>

The monkeys comes from different places... for example:
"The term monkey patch was first used as guerrilla patch, [...], which
was referred to as the patches engaging in battle with each other.
Since the word guerrilla and gorilla are near-homophones, people
started using the incorrect term gorilla patch instead of guerrilla
patch. When a developer then created a guerrilla patch they tried very
hard to avoid any battles that may ensue due to the patch and the term
monkey patch was coined to make the patch sound less forceful."

And then there is, as said, monkey wrenches which is utility tools.
Codemonkeys, i believe, comes from the infinite monkeys theory.


From pierre.gaillard at gmail.com  Mon Mar 29 09:44:51 2010
From: pierre.gaillard at gmail.com (Pierre)
Date: Mon, 29 Mar 2010 06:44:51 -0700 (PDT)
Subject: Matplotlib patches collection + alpha face
Message-ID: <7727f7e7-6337-4107-92c3-f5cfb2e90772@q15g2000yqj.googlegroups.com>

Hello,

I would like to draw on the same axes several patches (rectangle) with
different alpha-face (transparency)...
Anyone has an idea ?
In particular, I would like to use the class PatchCollection but it
seems that the alpha property is common to all the patches...

Thanks for your help.


From debatem1 at gmail.com  Mon Mar 29 10:01:28 2010
From: debatem1 at gmail.com (geremy condra)
Date: Mon, 29 Mar 2010 10:01:28 -0400
Subject: How to verify a signature using SHA1WithRSA with python
In-Reply-To: <hopi51$2dq$1@www.shinco.com>
References: <hopi51$2dq$1@www.shinco.com>
Message-ID: <h2nf3cc57c61003290701i614ff531sf7d219ef8e0935fb@mail.gmail.com>

On Mon, Mar 29, 2010 at 2:42 AM, Gao <gaoxtwarrior at gmail.com> wrote:
> I have a public key, and I want to write a method that verify a string which
> is a signature signed by this public key's private key. And is M2Crypto I
> can't find algorithm named "SHA1WithRSA" or so . Could anyone help me?
> --
> http://mail.python.org/mailman/listinfo/python-list
>

In OpenSSL you would simply use the EVP_Verify* functions, I don't
see that in M2Crypto's documentation though. You may have to use
RSA_Verify.

If you're not forced to use M2Crypto, you *may* want to check out evpy,
which is a set of ctypes bindings for openssl's evp interface and a very
easy to use wrapper. It's available at http://gitorious.org/evpy, and will
be up for a first release in a few weeks.

Geremy Condra


From pmaupin at gmail.com  Mon Mar 29 10:40:54 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 29 Mar 2010 07:40:54 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
Message-ID: <35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>

On Mar 28, 9:45?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> And what about tuples? And subclasses of list/tuples? How many different
> types need to be optimized?

One of the beautiful things about Python is that, for most things,
there are few surprises for even new users.  "There should be one
obvious way to do it" for the user means that, sometimes, under the
hood, there are a lot of special cases for the implementers.

> In practical terms, does anyone actually ever use sum on more than a
> handful of lists? I don't believe this is more than a hypothetical
> problem.

Right now, it's probably not, because when somebody sums a large list
and gets thwacked on the head by the lack of efficiency, they then
come here and get thwacked because "everybody knows" they should user
itertools or something else; not sum().
>
> The primary use case for sum is adding numbers when floating point
> accuracy is not critical. If you need float accuracy, use math.fsum.

See, I think the very existence of math.fsum() already violates "there
should be one obvious way to do it."

> But if anyone wants to submit a patch to the bug tracker, go right ahead.
> Without a patch though, I'd say that Python-Dev will consider this a non-
> issue.

Agreed.  Wish I had the time to do this sort of cleanup.

Regards,
Pat


From showell30 at yahoo.com  Mon Mar 29 11:12:00 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Mon, 29 Mar 2010 08:12:00 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au> 
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
Message-ID: <069f41e7-6a4a-4a40-b570-2559ca5ce69d@x11g2000prb.googlegroups.com>

On Mar 29, 7:40?am, Patrick Maupin <pmau... at gmail.com> wrote:
> On Mar 28, 9:45?pm, Steven D'Aprano
>
> <ste... at REMOVE.THIS.cybersource.com.au> wrote:
> > And what about tuples? And subclasses of list/tuples? How many different
> > types need to be optimized?
>
> One of the beautiful things about Python is that, for most things,
> there are few surprises for even new users. ?"There should be one
> obvious way to do it" for the user means that, sometimes, under the
> hood, there are a lot of special cases for the implementers.
>

If nothing else, I think it's reasonably for users to expect symmetry.

If you can use "+" to concatentate lists, then it seems reasonable
that something spelled "sum" would concatenate lists as well, and in
reasonable time.

> > In practical terms, does anyone actually ever use sum on more than a
> > handful of lists? I don't believe this is more than a hypothetical
> > problem.
>
> Right now, it's probably not, because when somebody sums a large list
> and gets thwacked on the head by the lack of efficiency, they then
> come here and get thwacked because "everybody knows" they should user
> itertools or something else; not sum().
>

Indeed.  It would be nice if the docs for sum() at least pointed to
list(itertools.chain(list_of_lists)), or whatever the most kosher
alternative is supposed to be.

It only takes a handful of sublists, about ten on my box, to expose
the limitation of the Shlemeil-the-Painter O(M*N*N) algorithm that's
under the hood.  It only takes 200 sublists to start getting a 10x
degradation in performance.

> > The primary use case for sum is adding numbers when floating point
> > accuracy is not critical. If you need float accuracy, use math.fsum.
>
> See, I think the very existence of math.fsum() already violates "there
> should be one obvious way to do it."
>

The nice thing about math.fsum() is that it is at least documented
from sum(), although I suspect some users try sum() without even
consulting the docs.

You could appease all users with an API where the most obvious choice,
sum(), never behaves badly, and where users can still call more
specialized versions (math.fsum() and friends) directly if they know
what they are doing.  This goes back to the statement that Patrick
makes--under the hood, this means more special cases for implementers,
but fewer pitfalls for users.



From gareth.sims at googlemail.com  Mon Mar 29 11:31:46 2010
From: gareth.sims at googlemail.com (Gryff)
Date: Mon, 29 Mar 2010 08:31:46 -0700 (PDT)
Subject: Newbie question: Tuples and reading csv files
Message-ID: <d16ea479-9814-4240-ae8a-52b77b2d6898@x3g2000yqd.googlegroups.com>

Hi

Its been 20 years since I programmed, so I'm stepping back in via
Python. However I'm beating my brains on tuples/lists (what I used to
know as arrays). I've fooled around with small code snippets and tried
a few things, but I can't figure out how to grab elements of
tuples ...

For example, I'm reading in a small csv file like this:

import csv

csvfile = open("example.csv")

#sniff the dialect
dialect = csv.Sniffer().sniff(csvfile.read(1024))
csvfile.seek(0)

# get file in using reader method

mylist=[]
reader = csv.reader(csvfile, dialect)

# grab the lines into a reader and pass to mylist

for row in reader:

    mylist.append(row)

# now print something out to prove this worked

print mylist[:3]

and the output I get is:

['Date', 'Open', 'High', 'Low', 'Close', 'Volume', 'Adj Close']
['2010-03-05', '224.20', '230.70', '223.80', '228.30', '5051500',
'228.30']
['2010-03-04', '223.00', '228.50', '220.50', '224.50', '4040500',
'224.50']

So far so good but not useful. My "mylist" has all the data in there,
but I can only figure out how to get each line out!?!
-> I want to get access to the individual items in each line. In my
bad old days I'd have used an array and grabbed "mylist
[row,item]" ...job done. Try as I like and after *lots* of reading
around, I can't figure out whether:

a) I'm missing something...really...simple
b) "You can't do that"  (and I should just use numpy and arrays?)
c) errrr....

Like I said, basic/newbie question from a programmer who spent 20
years away from it.

Cheers


Gareth


From showell30 at yahoo.com  Mon Mar 29 11:34:32 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Mon, 29 Mar 2010 08:34:32 -0700 (PDT)
Subject: Newbie question: Tuples and reading csv files
References: <d16ea479-9814-4240-ae8a-52b77b2d6898@x3g2000yqd.googlegroups.com>
Message-ID: <029f4a90-fbe5-4739-9c1d-f048046e4d9f@k5g2000prg.googlegroups.com>

On Mar 29, 8:31?am, Gryff <gareth.s... at googlemail.com> wrote:
> Hi
>
> Its been 20 years since I programmed, so I'm stepping back in via
> Python. However I'm beating my brains on tuples/lists (what I used to
> know as arrays). I've fooled around with small code snippets and tried
> a few things, but I can't figure out how to grab elements of
> tuples ...
>
> For example, I'm reading in a small csv file like this:
>
> import csv
>
> csvfile = open("example.csv")
>
> #sniff the dialect
> dialect = csv.Sniffer().sniff(csvfile.read(1024))
> csvfile.seek(0)
>
> # get file in using reader method
>
> mylist=[]
> reader = csv.reader(csvfile, dialect)
>
> # grab the lines into a reader and pass to mylist
>
> for row in reader:
>
> ? ? mylist.append(row)
>
> # now print something out to prove this worked
>
> print mylist[:3]
>
> and the output I get is:
>
> ['Date', 'Open', 'High', 'Low', 'Close', 'Volume', 'Adj Close']
> ['2010-03-05', '224.20', '230.70', '223.80', '228.30', '5051500',
> '228.30']
> ['2010-03-04', '223.00', '228.50', '220.50', '224.50', '4040500',
> '224.50']
>
> So far so good but not useful. My "mylist" has all the data in there,
> but I can only figure out how to get each line out!?!
> -> I want to get access to the individual items in each line. In my
> bad old days I'd have used an array and grabbed "mylist
> [row,item]" ...job done.

You are not too far:

mylist[row][item]

If you try that and still get an error (unlikely), be sure to post the
exact code you tried and any error messages.



From kushal.kumaran+python at gmail.com  Mon Mar 29 11:42:37 2010
From: kushal.kumaran+python at gmail.com (Kushal Kumaran)
Date: Mon, 29 Mar 2010 21:12:37 +0530
Subject: Newbie question: Tuples and reading csv files
In-Reply-To: <d16ea479-9814-4240-ae8a-52b77b2d6898@x3g2000yqd.googlegroups.com>
References: <d16ea479-9814-4240-ae8a-52b77b2d6898@x3g2000yqd.googlegroups.com>
Message-ID: <1e364c4e1003290842q1b0f65a4kc09faae19a40f097@mail.gmail.com>

On Mon, Mar 29, 2010 at 9:01 PM, Gryff <gareth.sims at googlemail.com> wrote:
> Hi
>
> Its been 20 years since I programmed, so I'm stepping back in via
> Python. However I'm beating my brains on tuples/lists (what I used to
> know as arrays). I've fooled around with small code snippets and tried
> a few things, but I can't figure out how to grab elements of
> tuples ...
>
> For example, I'm reading in a small csv file like this:
>
> import csv
>
> csvfile = open("example.csv")
>
> #sniff the dialect
> dialect = csv.Sniffer().sniff(csvfile.read(1024))
> csvfile.seek(0)
>
> # get file in using reader method
>
> mylist=[]
> reader = csv.reader(csvfile, dialect)
>
> # grab the lines into a reader and pass to mylist
>
> for row in reader:
>
> ? ?mylist.append(row)
>
> # now print something out to prove this worked
>
> print mylist[:3]
>
> and the output I get is:
>
> ['Date', 'Open', 'High', 'Low', 'Close', 'Volume', 'Adj Close']
> ['2010-03-05', '224.20', '230.70', '223.80', '228.30', '5051500',
> '228.30']
> ['2010-03-04', '223.00', '228.50', '220.50', '224.50', '4040500',
> '224.50']
>
> So far so good but not useful. My "mylist" has all the data in there,
> but I can only figure out how to get each line out!?!
> -> I want to get access to the individual items in each line. In my
> bad old days I'd have used an array and grabbed "mylist
> [row,item]" ...job done. Try as I like and after *lots* of reading
> around, I can't figure out whether:
>

mylist is a list of lists.  mylist[0] gives you the first list (the
row with the column headings, in your case).  You can get the first
item in that list by mylist[0][0].

> a) I'm missing something...really...simple
> b) "You can't do that" ?(and I should just use numpy and arrays?)
> c) errrr....
>
> Like I said, basic/newbie question from a programmer who spent 20
> years away from it.
>


-- 
regards,
kushal


From patentsvnc at gmail.com  Mon Mar 29 11:50:20 2010
From: patentsvnc at gmail.com (Den)
Date: Mon, 29 Mar 2010 08:50:20 -0700 (PDT)
Subject: OT: Meaning of "monkey"
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
Message-ID: <5ad930bd-131a-4b7d-99ea-e3258f75449e@a16g2000pre.googlegroups.com>

On Mar 26, 6:14?am, Luis M. Gonz?lez <luis... at gmail.com> wrote:
> Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
> Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
>
> Monkeys everywhere.
> Sorry for the off topic question, but what does "monkey" mean in a
> nerdy-geek context??
>
> Luis

To go even more off topic, I remember Trunk Monkey commercials.

Also, I remember a web site whose intentions was to simulate monkeys
typing Shakespeare.  They had set up a distributed system where you
could contribute your computer to providing random characters, which
they compared to a selected set of Shakespeare's plays.  Just before
the site disappeared (or I lost track of it), they had received
strings representing the first maybe 15 or 20 characters of several
plays.

Den


From gareth.sims at googlemail.com  Mon Mar 29 11:51:25 2010
From: gareth.sims at googlemail.com (Gryff)
Date: Mon, 29 Mar 2010 08:51:25 -0700 (PDT)
Subject: Newbie question: Tuples and reading csv files
References: <d16ea479-9814-4240-ae8a-52b77b2d6898@x3g2000yqd.googlegroups.com>
	<029f4a90-fbe5-4739-9c1d-f048046e4d9f@k5g2000prg.googlegroups.com>
Message-ID: <f268290b-f862-4773-bff8-c8ebc1deaa0a@33g2000yqj.googlegroups.com>

*tada!* *enlightenment*

Thanks - I figured it was something simple.... :-)


From tim at johnsons-web.com  Mon Mar 29 12:40:23 2010
From: tim at johnsons-web.com (Tim Johnson)
Date: Mon, 29 Mar 2010 11:40:23 -0500
Subject: Jython as an alternative to Python
Message-ID: <slrnhr1its.ng8.tim@bart.johnson.com>

FYI: I've used python for years primarily on *nix platforms and
primarily for web programming. I'm considering studying a scripting
language that uses and accesses java. My first obvious choice would by
jython. The following questions could probably be answered by pointers
to previous discussions, docs or blogs.

1)What can jython *do* that cannot be done by python.

2)What is the current state of jython as a development community?
  I.E. is it being upgraded, updated etc.

3)Is the jython community "bound to" the python community?
  I.E. I don't think python is going to "go away", what happens if
	jython development "stalls".

4)If someone in this community would consider a java scripting language
other than jython, what would it be? And why?

5)Are there issues installing and deploying jython on shared webservers?
  I.E. Assuming that a dedicated server is one that I have full access to and
	can install what I please, and a shared server would not afford me
	such access; is there any trend for "server farms" to install jython?

Thanks 
-- 
Tim 
tim at johnsons-web.com
http://www.akwebsoft.com


From keith at nekotaku.com  Mon Mar 29 13:16:40 2010
From: keith at nekotaku.com (KB)
Date: Mon, 29 Mar 2010 10:16:40 -0700 (PDT)
Subject: pythoncom.CoInitialize() not recognised in Eclipse
References: <4558b9a2-9d1c-4ec2-b564-9219be6443f2@w39g2000prd.googlegroups.com>
	<03f8158f-cc4e-4e98-a45a-d0749030e877@w29g2000prg.googlegroups.com>
Message-ID: <9e8fc13f-f8f2-4efa-8900-d19e228f0c99@t9g2000prh.googlegroups.com>

On Mar 28, 8:16?pm, Jason Scheirer <jason.schei... at gmail.com> wrote:
> On Mar 28, 7:14?pm, KB <ke... at nekotaku.com> wrote:
>
>
>
> > Hi there,
>
> > I have in the past used PythonWin to write python for COM, and
> > switched to Eclipse.
>
> > I am getting an error from the IDE saying it does not recognise
> > CoInitialize():
>
> > ****
> > import pythoncom
>
> > pythoncom.CoInitialize()
> > pythoncom.CoUninitialize()
> > ****
>
> > (red X next to the two bottom lines saying: "Undefined variable from
> > import: CoInitialize")
>
> > If I open a PyDev/Python Console window in Eclipse, I can type the
> > above, no errors, no problem.
>
> > I tried removing my Python Interpreter and re-adding/re-building but
> > no change.
>
> > python 2.5.2
> > eclipse 3.5.1
> > pydev 1.5.0
>
> > Thanks!
>
> PyDev is probably only looking at functions/classes defined in Python
> source files and not ones defined in C extensions.
>
> To confirm, try typing this in the window:
>
> import _ctypes
> _ctypes._Pointer()
>
> If it says that _ctypes._Pointer doesn't exist, then that's obviously
> the problem.

No problems at all with the editor recognising the above. Also note
that I tried the pythoncom snippet in my OP from the IDE's python
console without issue... weird.


From keith at nekotaku.com  Mon Mar 29 13:50:18 2010
From: keith at nekotaku.com (KB)
Date: Mon, 29 Mar 2010 10:50:18 -0700 (PDT)
Subject: pythoncom.CoInitialize() not recognised in Eclipse
References: <4558b9a2-9d1c-4ec2-b564-9219be6443f2@w39g2000prd.googlegroups.com>
	<mailman.1282.1269842879.23598.python-list@python.org>
Message-ID: <a4405bc6-178c-4856-827a-78246ecab5cc@u5g2000prd.googlegroups.com>

On Mar 28, 10:59?pm, "Dieter Verfaillie" <diet... at optionexplicit.be>
wrote:
> Quoting KB <ke... at nekotaku.com>:
>
> > I am getting an error from the IDE saying it does not recognise
> > CoInitialize():
>
> > ****
> > import pythoncom
>
> > pythoncom.CoInitialize()
> > pythoncom.CoUninitialize()
> > ****
>
> It works out of the box with PyDev 1.5.5.2010030420 on Eclipse 3.5.2 ?
> on Windows XP. If nothing seems to work for you, you could try adding ?
> pythoncom to the
> "Forced Builtins" tab of your Python interpreter configuration to see if it
> helps (restart eclipse after you've done that, sometimes changes to ?
> the symbols
> database don't get picked up without restarting eclipse...)

Dieter, Thanks, I tried updating my PyDev and Eclipse to your
versions.

Still same issue. How exactly would I add pythoncom to the Forced
Builtins ? I tried simply adding "pythoncom" to the Forced Builtin's
tab but no change.

Any suggestions?


From steve at holdenweb.com  Mon Mar 29 14:02:04 2010
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 29 Mar 2010 14:02:04 -0400
Subject: Jython as an alternative to Python
In-Reply-To: <slrnhr1its.ng8.tim@bart.johnson.com>
References: <slrnhr1its.ng8.tim@bart.johnson.com>
Message-ID: <hoqpv3$m88$1@dough.gmane.org>

Tim Johnson wrote:
> FYI: I've used python for years primarily on *nix platforms and
> primarily for web programming. I'm considering studying a scripting
> language that uses and accesses java. My first obvious choice would by
> jython. The following questions could probably be answered by pointers
> to previous discussions, docs or blogs.
> 
> 1)What can jython *do* that cannot be done by python.
> 
Import Java classes and instantiate them, calling their methods from Python.

> 2)What is the current state of jython as a development community?
>   I.E. is it being upgraded, updated etc.
> 
It's currently just about at 2.6, and the developers are committed to a
port to 3.x (probably 3.2, I suspect) but haven't yet committed to a
timescale. Two of the main developers have just started work at Sauce
Labs, and this may affect their availability.

> 3)Is the jython community "bound to" the python community?
>   I.E. I don't think python is going to "go away", what happens if
> 	jython development "stalls".
> 
The PSF has already once provided a grant to keep Jython moving forward
when it looked like it might stall. I don't know whether this is
inevitable in the future, but *I* think Jython should be kept in the
mainstream.

> 4)If someone in this community would consider a java scripting language
> other than jython, what would it be? And why?
> 
Pass.

> 5)Are there issues installing and deploying jython on shared webservers?
>   I.E. Assuming that a dedicated server is one that I have full access to and
> 	can install what I please, and a shared server would not afford me
> 	such access; is there any trend for "server farms" to install jython?

I don't know. A survey of Python-friendly hosting companies would be
useful. You could use

  http://wiki.python.org/moin/PythonHosting

as a starting point, and publish the data you discover.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From gagsl-py2 at yahoo.com.ar  Mon Mar 29 15:19:18 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 29 Mar 2010 16:19:18 -0300
Subject: Super() function
References: <4BAAD5E0.9050604@googlemail.com>
	<op.u93uq1jyx6zn5v@gabriel.sleipnir-bsas>
	<4BAE359F.6090200@googlemail.com>
	<E4C7BCAB1872014F81CEAACD25699B8C01A49E87@301081ANEX2.global.avaya.com>
Message-ID: <op.vacfyghqx6zn5v@lepton.softlabbsas.com.ar>

En Sun, 28 Mar 2010 21:58:07 -0300, Delaney, Timothy (Tim)  
<tdelaney at avaya.com> escribi?:
>> Gabriel Genellina wrote:
>>> Alan Harris-Reid <aharrisreid at googlemail.com> escribi?:
>>>
>>>> Using Python 3.1, I sometimes use the super() function to call the
>>>> equivalent method from a parent class, for example
>>>>
>>>> def mymethod(self):
>>>>     super().mymethod()
>>>>     some more code...
>>>
>>> This recipe does what you want:
>>> http://code.activestate.com/recipes/286195-selfsuper/
> If you think the pure-python version of the recipe is complicated, you  
> should have
> a look at the performance-optimised Pyrex version ;)

Where can we look at it? The link in the activestate recipe does not work  
anymore :(

-- 
Gabriel Genellina



From tim at johnsons-web.com  Mon Mar 29 15:40:22 2010
From: tim at johnsons-web.com (Tim Johnson)
Date: Mon, 29 Mar 2010 14:40:22 -0500
Subject: Jython as an alternative to Python
References: <slrnhr1its.ng8.tim@bart.johnson.com>
	<mailman.1290.1269885750.23598.python-list@python.org>
Message-ID: <slrnhr20qd.ng8.tim@bart.johnson.com>

On 2010-03-29, Steve Holden <steve at holdenweb.com> wrote:
> Tim Johnson wrote:
<<.>> 1)What can jython *do* that cannot be done by python.
>> 
> Import Java classes and instantiate them, calling their methods from Python.
 Of course
>> 2)What is the current state of jython as a development community?
>>   I.E. is it being upgraded, updated etc.
>> 
> It's currently just about at 2.6, and the developers are committed to a
> port to 3.x (probably 3.2, I suspect) but haven't yet committed to a
> timescale. Two of the main developers have just started work at Sauce
> Labs, and this may affect their availability.
  That is the news I was looking for.
>> 3)Is the jython community "bound to" the python community?
>>   I.E. I don't think python is going to "go away", what happens if
>> 	jython development "stalls".
>> 
> The PSF has already once provided a grant to keep Jython moving forward
> when it looked like it might stall. I don't know whether this is
> inevitable in the future, but *I* think Jython should be kept in the
> mainstream.
 Ditto.
>> 4)If someone in this community would consider a java scripting language
>> other than jython, what would it be? And why?
>> 
> Pass.
 <grin>. I've looked at clojure and kawa since I have a comfort level
 with lisp dialects, but clojure seems pretty proprietory (and thus
 exotic). kawa advertises that it complies with the general scheme
 specification. And I'm a little leery about the 'exotic' since I
 already use two 'exotic' server - side languages.

>> 5)Are there issues installing and deploying jython on shared webservers?
>>   I.E. Assuming that a dedicated server is one that I have full access to and
>> 	can install what I please, and a shared server would not afford me
>> 	such access; is there any trend for "server farms" to install jython?
>
> I don't know. A survey of Python-friendly hosting companies would be
> useful. You could use
  Not really a big deal with me, as I work primarily with dedicated
	servers, but ....
>   http://wiki.python.org/moin/PythonHosting
 Not much there. I will look further, given time,
 I note the googling "jython friendly hostings" shows this
 thread at the top :)

 I appreciate the reply.
 thanks
-- 
Tim 
tim at johnsons-web.com
http://www.akwebsoft.com


From christos.jonathan.hayward at gmail.com  Mon Mar 29 15:41:15 2010
From: christos.jonathan.hayward at gmail.com (Jonathan Hayward)
Date: Mon, 29 Mar 2010 12:41:15 -0700 (PDT)
Subject: "Usability, the Soul of Python"
Message-ID: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>

I've posted "Usability, the Soul of Python: An Introduction to the
Python Programming Language Through the Eyes of Usability", at:

   http://JonathansCorner.com/python/

The basic suggestion is that much of what works well in Python has
something to do with the usability it offers programmers.

Enjoy.

--
Jonathan Hayward, christos.jonathan.hayward at gmail.com
An Orthodox Christian author: theology, literature, et cetera.
My award-winning collection is available for free reading online:
I invite you to visit my main site at http://JonathansCorner.com/


From phlip2005 at gmail.com  Mon Mar 29 15:45:39 2010
From: phlip2005 at gmail.com (Phlip)
Date: Mon, 29 Mar 2010 12:45:39 -0700 (PDT)
Subject: "Usability, the Soul of Python"
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
Message-ID: <d4b5e0f4-8942-4640-9f0f-9f96a9df6d14@r27g2000yqn.googlegroups.com>

Jonathan Hayward wrote:

> I've posted "Usability, the Soul of Python: An Introduction to the
> Python Programming Language Through the Eyes of Usability", at:
>
> ? ?http://JonathansCorner.com/python/
>
> The basic suggestion is that much of what works well in Python has
> something to do with the usability it offers programmers.

You mean like...

  Order.has_many :line_items

?

Oops, sorry, wrong language. My bad!

--
  Phlip
  http://zeekland.zeroplayer.com/


From saimapk81 at gmail.com  Mon Mar 29 16:07:59 2010
From: saimapk81 at gmail.com (saima81)
Date: Mon, 29 Mar 2010 13:07:59 -0700 (PDT)
Subject: "jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
	saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
	saudi telecom" "saudi arabia jobs "on
	http://jobsinsaudiarabia-net.blogspot.com/
Message-ID: <26910518-73d6-4fd8-8cdb-9bc862d58beb@a4g2000prb.googlegroups.com>

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"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
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"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
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"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
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"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
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"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
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"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
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"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
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saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
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"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
saudi telecom" "saudi arabia jobs "on http://jobsinsaudiarabia-net.blogspot.com/
"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
saudi telecom" "saudi arabia jobs "on http://jobsinsaudiarabia-net.blogspot.com/
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From stefan_ml at behnel.de  Mon Mar 29 16:14:22 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Mon, 29 Mar 2010 22:14:22 +0200
Subject: =?windows-1252?Q?Re=3A_I=27m_looking_for_html_cleaner=2E?=
	=?windows-1252?Q?_Example_=3A_convert_=3Ch1=3E=3Cspan=3E=3Cfont=3E?=
	=?windows-1252?Q?my_title=3C/font=3E=3C/span=3E=3C/h1=3E_=3D=3E_=3C?=
	=?windows-1252?Q?h1=3Emy_title=3C/h1=3E=85?=
In-Reply-To: <hopncq$gqk$1@dough.gmane.org>
References: <hopncq$gqk$1@dough.gmane.org>
Message-ID: <hor1mu$mgi$1@dough.gmane.org>

St?phane Klein, 29.03.2010 10:12:
> I work on HTML cleaner.
>
> I export OpenOffice.org documents to HTML.
> Next, I would like clean this HTML export files :
>
> * remove comment
> * remove style
> * remove dispensable tag
> * ...
>
> some difficulty :
>
> * convert <p>my text <span>foo</span> bar</p> => <p>my text foo par</p>
> * convert <h1><span><font>my title</font></span></h1> => <h1>my title</h1>
>
> to do this process, I use lxml and pyquery.

lxml.html has tools for that in the 'clean' module. Just specify the list 
of tags that you want to discard.


> * are there some xml helper tools in Python to do this process ? I've
> looked for in pypi, I found nothing about it

The HTML tools in the standard library are close to non-existant. You can 
achieve some things with the builtin tools, but if they fail for a 
particular input document, there's little you can do.


> If you confirm than this tools don't exists, I'll maybe publish a helper
> package to do this "clean" processing.

Take a look at lxml.html.clean first.

Stefan



From g.bogle at auckland.no.spam.ac.nz  Mon Mar 29 18:31:14 2010
From: g.bogle at auckland.no.spam.ac.nz (Gib Bogle)
Date: Tue, 30 Mar 2010 11:31:14 +1300
Subject: OT: Meaning of "monkey"
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
	<hoikqe$qcu$1@reader1.panix.com>
Message-ID: <hor9nh$nrh$3@speranza.aioe.org>

I prefer to think of myself as a code-ape - I look down on code-monkeys.


From steve at REMOVE-THIS-cybersource.com.au  Mon Mar 29 19:19:28 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 29 Mar 2010 23:19:28 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
Message-ID: <4bb13580$0$8827$c3e8da3@news.astraweb.com>

On Mon, 29 Mar 2010 07:40:54 -0700, Patrick Maupin wrote:

> On Mar 28, 9:45?pm, Steven D'Aprano
> <ste... at REMOVE.THIS.cybersource.com.au> wrote:
>> And what about tuples? And subclasses of list/tuples? How many
>> different types need to be optimized?
> 
> One of the beautiful things about Python is that, for most things, there
> are few surprises for even new users.  "There should be one obvious way
> to do it" for the user means that, sometimes, under the hood, there are
> a lot of special cases for the implementers.

It never ceases to amaze me how often people simply don't understand this.

"There should be one obvious way to do it" is the opposite of "NO obvious 
way", not of "many ways which may or may not be obvious". The complete 
quote from the Zen makes that clear:

There should be one-- and preferably ONLY one --obvious way to do it.
[Emphasis added]

And don't forget the next line:

Although that way may not be obvious at first unless you're Dutch.

Python is under no compulsion to make "the obvious way" obvious to anyone 
except Guido. It's a bonus if it happens to be obvious to newbies, not a 
requirement.

And besides, what is "it" you're talking about?

* Adding integers, decimals or fractions, or floats with a low
  requirement for precision and accuracy? Use sum.

* Adding floats with a high requirement for precision and accuracy? 
  Use math.fsum.

* Concatenating strings? Use ''.join.

* Joining lists? Use [].extend.

* Iterating over an arbitrary sequence of arbitrary sequences? 
  Use itertools.chain.

That's five different "its", and five obvious ways to do them.


>> In practical terms, does anyone actually ever use sum on more than a
>> handful of lists? I don't believe this is more than a hypothetical
>> problem.
> 
> Right now, it's probably not, because when somebody sums a large list
> and gets thwacked on the head by the lack of efficiency, they then come
> here and get thwacked because "everybody knows" they should user
> itertools or something else; not sum().

Exactly. If you're adding a large number of large lists, you're already 
doing it wrong. Making sum more efficient is just a band aid.


>> The primary use case for sum is adding numbers when floating point
>> accuracy is not critical. If you need float accuracy, use math.fsum.
> 
> See, I think the very existence of math.fsum() already violates "there
> should be one obvious way to do it."

How does the existence of math.fsum contradict the existence of sum?




-- 
Steven


From tdelaney at avaya.com  Mon Mar 29 19:35:43 2010
From: tdelaney at avaya.com (Delaney, Timothy (Tim))
Date: Tue, 30 Mar 2010 07:35:43 +0800
Subject: Super() function
In-Reply-To: <op.vacfyghqx6zn5v@lepton.softlabbsas.com.ar>
References: <4BAAD5E0.9050604@googlemail.com><op.u93uq1jyx6zn5v@gabriel.sleipnir-bsas><4BAE359F.6090200@googlemail.com><E4C7BCAB1872014F81CEAACD25699B8C01A49E87@301081ANEX2.global.avaya.com>
	<op.vacfyghqx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <E4C7BCAB1872014F81CEAACD25699B8C01A4A085@301081ANEX2.global.avaya.com>

Gabriel Genellina write:

> En Sun, 28 Mar 2010 21:58:07 -0300, Delaney, Timothy (Tim) <tdelaney at avaya.com> escribi?:
>>> Gabriel Genellina wrote:
>>>> Alan Harris-Reid <aharrisreid at googlemail.com> escribi?:
>>>>
>>>>> Using Python 3.1, I sometimes use the super() function to call the 
>>>>> equivalent method from a parent class, for example
>>>>>
>>>>> def mymethod(self):
>>>>>     super().mymethod()
>>>>>     some more code...
>>>>
>>>> This recipe does what you want:
>>>> http://code.activestate.com/recipes/286195-selfsuper/
>> If you think the pure-python version of the recipe is complicated, you 
>> should have a look at the performance-optimised Pyrex version ;)
>
> Where can we look at it? The link in the activestate recipe does not work anymore :(

You're right - I've changed ISPs. I'll have to find somewhere else to upload it and change the link. Can't do it today unfortunately.

Tim Delaney


From no.email at nospam.invalid  Mon Mar 29 19:36:17 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Mon, 29 Mar 2010 16:36:17 -0700
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
	<4bb13580$0$8827$c3e8da3@news.astraweb.com>
Message-ID: <7xtyryitu6.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
> * Iterating over an arbitrary sequence of arbitrary sequences? 
>   Use itertools.chain.

chain is only for finite sequences.  For arbitrary sequences,
use chain.from_iterable. 


From steve at REMOVE-THIS-cybersource.com.au  Mon Mar 29 19:38:53 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 29 Mar 2010 23:38:53 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
	<069f41e7-6a4a-4a40-b570-2559ca5ce69d@x11g2000prb.googlegroups.com>
Message-ID: <4bb13a0c$0$8827$c3e8da3@news.astraweb.com>

On Mon, 29 Mar 2010 08:12:00 -0700, Steve Howell wrote:

> On Mar 29, 7:40?am, Patrick Maupin <pmau... at gmail.com> wrote:
>> On Mar 28, 9:45?pm, Steven D'Aprano
>>
>> <ste... at REMOVE.THIS.cybersource.com.au> wrote:
>> > And what about tuples? And subclasses of list/tuples? How many
>> > different types need to be optimized?
>>
>> One of the beautiful things about Python is that, for most things,
>> there are few surprises for even new users. ?"There should be one
>> obvious way to do it" for the user means that, sometimes, under the
>> hood, there are a lot of special cases for the implementers.
>>
>>
> If nothing else, I think it's reasonably for users to expect symmetry.

Why? What is symmetry in programming?

Since the + operator takes both numbers and lists, and the - operator 
doesn't, does "symmetry" require that we make up some list operation so 
that integers and lists are symmetrical?


> If you can use "+" to concatentate lists, then it seems reasonable that
> something spelled "sum" would concatenate lists as well, and in
> reasonable time.

Where do you get the "reasonable time" from? A *single* + on lists can be 
slooooow. Try this:

L = [None]*10**9
result = L+L

(assuming you've even got enough memory to do so)

With a very few exceptions (e.g. dict lookup being "usually" O(1), list 
append being amortized O(1)), Python makes no promises about performance. 
It's not part of the language. If you, the programmer, are making any 
assumptions about performance that aren't clearly and explicitly 
documented in the official docs, then YOU are at fault, not Python.


>> > In practical terms, does anyone actually ever use sum on more than a
>> > handful of lists? I don't believe this is more than a hypothetical
>> > problem.
>>
>> Right now, it's probably not, because when somebody sums a large list
>> and gets thwacked on the head by the lack of efficiency, they then come
>> here and get thwacked because "everybody knows" they should user
>> itertools or something else; not sum().
>>
>>
> Indeed.  It would be nice if the docs for sum() at least pointed to
> list(itertools.chain(list_of_lists)), or whatever the most kosher
> alternative is supposed to be.
> 
> It only takes a handful of sublists, about ten on my box, to expose the
> limitation of the Shlemeil-the-Painter O(M*N*N) algorithm that's under
> the hood.  It only takes 200 sublists to start getting a 10x degradation
> in performance.

And how many times have you needed to add 200 sublists?

How many times have you needed to add 10 sublists?

Nobody has demonstrated that this is anything more than a hypothetical 
problem.


>> > The primary use case for sum is adding numbers when floating point
>> > accuracy is not critical. If you need float accuracy, use math.fsum.
>>
>> See, I think the very existence of math.fsum() already violates "there
>> should be one obvious way to do it."
>>
>>
> The nice thing about math.fsum() is that it is at least documented from
> sum(), although I suspect some users try sum() without even consulting
> the docs.
> 
> You could appease all users with an API where the most obvious choice,
> sum(), never behaves badly, and where users can still call more
> specialized versions (math.fsum() and friends) directly if they know
> what they are doing.  This goes back to the statement that Patrick
> makes--under the hood, this means more special cases for implementers,
> but fewer pitfalls for users.

More special cases for implementers means more bugs in the language, 
which means I end up writing my own code and ignoring the built-in 
version anyway.

More special cases means I have to pay the cost of high accuracy float 
summation even when I don't need, or want, it.

More special cases means I'm fooled into paying the cost of summing lists 
when I don't need to, because it's easier than importing itertools:

for item in sum(lots_of_lists):
    pass

needlessly creates a large list out of the smaller ones. Even if I don't 
fall for the temptation, and write bad code, I still pay the cost in the 
libraries and applications written by others.


More special cases isn't free. It's MORE costly than teaching users to 
use list.extend or itertools.chain.


-- 
Steven


From mensanator at aol.com  Mon Mar 29 19:59:58 2010
From: mensanator at aol.com (Mensanator)
Date: Mon, 29 Mar 2010 16:59:58 -0700 (PDT)
Subject: OT: Meaning of "monkey"
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
	<hoikqe$qcu$1@reader1.panix.com> <hor9nh$nrh$3@speranza.aioe.org>
Message-ID: <c63b5602-09b1-4415-9c09-ad968a02bda7@z35g2000yqd.googlegroups.com>

On Mar 29, 5:31?pm, Gib Bogle <g.bo... at auckland.no.spam.ac.nz> wrote:
> I prefer to think of myself as a code-ape - I look down on code-monkeys.

Why? They have prehensile tails.


From nagle at animats.com  Mon Mar 29 20:30:05 2010
From: nagle at animats.com (John Nagle)
Date: Mon, 29 Mar 2010 17:30:05 -0700
Subject: "Usability, the Soul of Python"
In-Reply-To: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
Message-ID: <4bb14173$0$1640$742ec2ed@news.sonic.net>

Jonathan Hayward wrote:
> I've posted "Usability, the Soul of Python: An Introduction to the
> Python Programming Language Through the Eyes of Usability", at:
> 
>    http://JonathansCorner.com/python/

    No, it's just a rather verbose introduction to Python, in dark brown
type on a light brown background.  One could write a good paper on this
topic, but this isn't it.

    By the same author: "The Case For Uncreative Web Design", which
has no examples.

				John Nagle


From nagle at animats.com  Mon Mar 29 20:35:09 2010
From: nagle at animats.com (John Nagle)
Date: Mon, 29 Mar 2010 17:35:09 -0700
Subject: =?windows-1252?Q?Re=3A_I=27m_looking_for_html_cleaner=2E?=
	=?windows-1252?Q?_Example_=3A_convert_=3Ch1=3E=3Cspan=3E=3Cfont=3E?=
	=?windows-1252?Q?my_title=3C/font=3E=3C/span=3E=3C/h1=3E_=3D=3E_=3C?=
	=?windows-1252?Q?h1=3Emy_title=3C/h1=3E=85?=
In-Reply-To: <mailman.1284.1269850345.23598.python-list@python.org>
References: <mailman.1284.1269850345.23598.python-list@python.org>
Message-ID: <4bb142a4$0$1669$742ec2ed@news.sonic.net>

St?phane Klein wrote:
> Hi,
> 
> I work on HTML cleaner.
> 
> I export OpenOffice.org documents to HTML.
> Next, I would like clean this HTML export files :
> 
> * remove comment
> * remove style
> * remove dispensable tag
> * ...

    Try parsing with HTML5 Parser ("http://code.google.com/p/html5lib/") which
is the closest thing to a good parser available for Python.  It's basically
a reference implementation of HTML5, including all the handling of bad HTML.

    Once you have a tree, write something to go through the tree and remove
empty tags from a list of tags which do nothing when empty.  Then
regenerate HTML from the tree.

    Or just use HTML Tidy: "http://www.w3.org/People/Raggett/tidy/"

					John Nagle


From lxkain at gmail.com  Mon Mar 29 20:54:26 2010
From: lxkain at gmail.com (LX)
Date: Mon, 29 Mar 2010 17:54:26 -0700 (PDT)
Subject: decorators only when __debug__ == True
Message-ID: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>

Hi all, I have a question about decorators. I would like to use them
for argument checking, and pre/post conditions. However, I don't want
the additional overhead when I run in non-debug mode. I could do
something like this, using a simple trace example.


@decorator
def pass_decorator(f, *args, **kw): # what about the slow-down that
incurs when using pass_decorator?
    return f(*args, **kw)

@decorator
def trace_decorator(f, *args, **kw):
    print "calling %s with args %s, %s" % (f.func_name, args, kw)
    return f(*args, **kw)

trace_enable_flag = False #__debug__
trace = trace_decorator if trace_enable_flag else pass_decorator


Trouble is, there is still an additional encapsulating function call.
Is there any way to eliminate the extra function call altogether?
Thanks in advance!


From brian at sweetapp.com  Mon Mar 29 21:23:12 2010
From: brian at sweetapp.com (Brian Quinlan)
Date: Mon, 29 Mar 2010 18:23:12 -0700
Subject: xml-rpc
In-Reply-To: <4B9C9AF9.80609@gmail.com>
References: <4B9C9AF9.80609@gmail.com>
Message-ID: <0590084D-BB4A-4D4E-B331-B7F486597A1A@sweetapp.com>


On Mar 14, 2010, at 12:14 AM, ahmet erdinc yilmaz wrote:

> Hello,
>
> Recenetly we are developing a senior project and decide to use  
> xmlrpclib.
> However I have some questions. In the documentation I could not find  
> any clue about
> handling requests? Does the server handles each request in a  
> separate thread? Or is
> there some queuing mechanism for client calls? Thanks in advance.

By default calls are processed serially. Look for ThreadingMixIn in:
http://docs.python.org/library/socketserver.html

And maybe read this too:
http://code.activestate.com/recipes/81549-a-simple-xml-rpc-server/

Cheers,
Brian

>
>
> --erdinc
> -- 
> http://mail.python.org/mailman/listinfo/python-list



From python at mrabarnett.plus.com  Mon Mar 29 21:34:27 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 30 Mar 2010 02:34:27 +0100
Subject: decorators only when __debug__ == True
In-Reply-To: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>
Message-ID: <4BB15523.4040901@mrabarnett.plus.com>

LX wrote:
> Hi all, I have a question about decorators. I would like to use them
> for argument checking, and pre/post conditions. However, I don't want
> the additional overhead when I run in non-debug mode. I could do
> something like this, using a simple trace example.
> 
> 
> @decorator
> def pass_decorator(f, *args, **kw): # what about the slow-down that
> incurs when using pass_decorator?
>     return f(*args, **kw)
> 
> @decorator
> def trace_decorator(f, *args, **kw):
>     print "calling %s with args %s, %s" % (f.func_name, args, kw)
>     return f(*args, **kw)
> 
> trace_enable_flag = False #__debug__
> trace = trace_decorator if trace_enable_flag else pass_decorator
> 
> 
> Trouble is, there is still an additional encapsulating function call.
> Is there any way to eliminate the extra function call altogether?
> Thanks in advance!

I think you have misunderstood certain details about decorators.

This code with a decorator:

     @decorator
     def hello():
         print "hello world"

basically does this:

     def hello():
         print "hello world"
     hello = decorator(hello)

so your non-decorator just needs to return the function it was passed:

     def pass_decorator(func):
         return func

and your trace decorator would be something like this:

     def trace_decorator(func):
         def show(*args, **kwargs):
             print "calling %s with args %s, %s" % (func.func_name, 
args, kwargs)
             result = func(*args, **kwargs)
             print "returning %s from %s" % (result, func.func_name)
             return result
         return show


From showell30 at yahoo.com  Mon Mar 29 22:05:30 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Mon, 29 Mar 2010 19:05:30 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au> 
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com> 
	<069f41e7-6a4a-4a40-b570-2559ca5ce69d@x11g2000prb.googlegroups.com> 
	<4bb13a0c$0$8827$c3e8da3@news.astraweb.com>
Message-ID: <bc431bd4-404d-4725-a96b-bbf00dba13bd@q23g2000yqd.googlegroups.com>

On Mar 29, 4:38?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Mon, 29 Mar 2010 08:12:00 -0700, Steve Howell wrote:
> > On Mar 29, 7:40?am, Patrick Maupin <pmau... at gmail.com> wrote:
> >> On Mar 28, 9:45?pm, Steven D'Aprano
>
> >> <ste... at REMOVE.THIS.cybersource.com.au> wrote:
> >> > And what about tuples? And subclasses of list/tuples? How many
> >> > different types need to be optimized?
>
> >> One of the beautiful things about Python is that, for most things,
> >> there are few surprises for even new users. ?"There should be one
> >> obvious way to do it" for the user means that, sometimes, under the
> >> hood, there are a lot of special cases for the implementers.
>
> > If nothing else, I think it's reasonably for users to expect symmetry.
>
> Why? What is symmetry in programming?

"Symmetry" is best shown by example.

 >>> 3 - 2
 1
 >>> set([1,2,3]) - set([2,3])
 set([1])

 >>> 5 * 3
 15
 >>> [1, 2, 3, 4, 5] * 3
 [1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5]

 >>> 1 + 2 + 3 + 4
 10
 >>> sum([1,2,3,4])
 10

 >>> [1,2] + [3,4]
 [1, 2, 3, 4]
 >>> sum([[1,2], [3,4]], [])
 [1, 2, 3, 4]

> Since the + operator takes both numbers and lists, and the - operator
> doesn't, does "symmetry" require that we make up some list operation so
> that integers and lists are symmetrical?
>

No.  Nobody is advocating for list subtraction.

> > If you can use "+" to concatentate lists, then it seems reasonable that
> > something spelled "sum" would concatenate lists as well, and in
> > reasonable time.
>
> Where do you get the "reasonable time" from?
>

>From common sense.  Concatenation of lists should be in O(M*N) time,
not O(M*N*N), because there is no need to build intermediate lists.

>
> With a very few exceptions (e.g. dict lookup being "usually" O(1), list
> append being amortized O(1)), Python makes no promises about performance.
> It's not part of the language. If you, the programmer, are making any
> assumptions about performance that aren't clearly and explicitly
> documented in the official docs, then YOU are at fault, not Python.

I'm not making any assumptions here.  I know that sum() is needlessly
slow for lists, even though it is not explicitly documented.

>
> > It only takes a handful of sublists, about ten on my box, to expose the
> > limitation of the Shlemeil-the-Painter O(M*N*N) algorithm that's under
> > the hood. ?It only takes 200 sublists to start getting a 10x degradation
> > in performance.
>
> And how many times have you needed to add 200 sublists?
>
> How many times have you needed to add 10 sublists?
>

Aggregating lists is a very common task in programming.  An example of
a list of lists would be a list of departments, where each department
is a list of employees.  If you want to sort the employees, you will
want to aggregate to a list.

> More special cases for implementers means more bugs in the language,
> which means I end up writing my own code and ignoring the built-in
> version anyway.
>

Special cases do not have to introduce bugs in the language.

> More special cases means I have to pay the cost of high accuracy float
> summation even when I don't need, or want, it.
>

Nothing about making sum() work for the general cases precludes more
specific, optimized functions.

> More special cases means I'm fooled into paying the cost of summing lists
> when I don't need to, because it's easier than importing itertools:

You don't have to be fooled.

> for item in sum(lots_of_lists):
> ? ? pass
>
> needlessly creates a large list out of the smaller ones.

Although this is a mostly harmless example, developers with common
sense would not sum lots of lists unless they expected to keep the
resulting list around for multiple operations, or for one operation,
like sort(), where you need to create a list for the subsequent
operation.

> Even if I don't
> fall for the temptation, and write bad code, I still pay the cost in the
> libraries and applications written by others.

You already pay the small price for polymorphism when you use Python.

> More special cases isn't free.

Nobody said they were.

> It's MORE costly than teaching users to
> use list.extend or itertools.chain.
>

Which the docs for sum() don't do.



From steven at REMOVE.THIS.cybersource.com.au  Mon Mar 29 22:11:09 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 30 Mar 2010 02:11:09 GMT
Subject: decorators only when __debug__ == True
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>
Message-ID: <pan.2010.03.30.02.11.09@REMOVE.THIS.cybersource.com.au>

On Mon, 29 Mar 2010 17:54:26 -0700, LX wrote:

> Hi all, I have a question about decorators. I would like to use them for
> argument checking, and pre/post conditions. However, I don't want the
> additional overhead when I run in non-debug mode. I could do something
> like this, using a simple trace example.


def decorator(func):
    if __debug__:
        @functools.wraps(func)
        def inner(*args, **kwargs):
            preprocess()
            result = func(*args, **kwargs)
            postprocess()
            return result
        return inner
    else:
        return func



-- 
Steven


From pmaupin at gmail.com  Mon Mar 29 22:24:42 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 29 Mar 2010 19:24:42 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au> 
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com> 
	<4bb13580$0$8827$c3e8da3@news.astraweb.com>
Message-ID: <31c7977e-9c8d-4be0-ae21-3c490e6364fe@z35g2000yqd.googlegroups.com>

On Mar 29, 6:19?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> How does the existence of math.fsum contradict the existence of sum?

You're exceptionally good at (probably deliberately) mis-interpreting
what people write.

Regards,
Pat


From pmaupin at gmail.com  Mon Mar 29 22:31:44 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 29 Mar 2010 19:31:44 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au> 
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com> 
	<069f41e7-6a4a-4a40-b570-2559ca5ce69d@x11g2000prb.googlegroups.com> 
	<4bb13a0c$0$8827$c3e8da3@news.astraweb.com>
Message-ID: <8dac78c8-124a-4b02-9944-6d577bfac84f@15g2000yqi.googlegroups.com>

On Mar 29, 6:38?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> With a very few exceptions (e.g. dict lookup being "usually" O(1), list
> append being amortized O(1)), Python makes no promises about performance.
> It's not part of the language. If you, the programmer, are making any
> assumptions about performance that aren't clearly and explicitly
> documented in the official docs, then YOU are at fault, not Python.

It's not about promises, guarantees, quid-pro-quo, etc.

It's about a lack of surprises.  Which, 99% of the time, Python excels
at.  This is why many of us program in Python.  This is why some of us
who would never use sum() on lists, EVEN IF IT WERE FIXED TO NOT BE SO
OBNOXIOUSLY SLOW, advocate that it, in fact, be fixed to not be so
obnoxiously slow.

BTW, it's also not about "fault".  There is no shame in writing a
Python program, seeing that it doesn't go fast enough, and then
hammering on it until it does.  There is also no shame in not reading
the docs before you write the program, although arguably (and you
obviously work very hard to help see to this) a great deal of shame
attaches to posting to the newsgroup before reading the docs.

Regards,
Pat


From showell30 at yahoo.com  Mon Mar 29 22:53:04 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Mon, 29 Mar 2010 19:53:04 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au> 
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com> 
	<4bb13580$0$8827$c3e8da3@news.astraweb.com>
Message-ID: <fea04f68-dfda-4ff5-8562-7a3e967fb732@y33g2000pre.googlegroups.com>

On Mar 29, 4:19?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Mon, 29 Mar 2010 07:40:54 -0700, Patrick Maupin wrote:
> > On Mar 28, 9:45?pm, Steven D'Aprano
> > <ste... at REMOVE.THIS.cybersource.com.au> wrote:
> >> And what about tuples? And subclasses of list/tuples? How many
> >> different types need to be optimized?
>
> > One of the beautiful things about Python is that, for most things, there
> > are few surprises for even new users. ?"There should be one obvious way
> > to do it" for the user means that, sometimes, under the hood, there are
> > a lot of special cases for the implementers.
>
> It never ceases to amaze me how often people simply don't understand this.
>
> "There should be one obvious way to do it" is the opposite of "NO obvious
> way", not of "many ways which may or may not be obvious". The complete
> quote from the Zen makes that clear:
>
> There should be one-- and preferably ONLY one --obvious way to do it.
> [Emphasis added]
>
> And don't forget the next line:
>
> Although that way may not be obvious at first unless you're Dutch.
>
> Python is under no compulsion to make "the obvious way" obvious to anyone
> except Guido. It's a bonus if it happens to be obvious to newbies, not a
> requirement.
>
> And besides, what is "it" you're talking about?
>
> * Adding integers, decimals or fractions, or floats with a low
> ? requirement for precision and accuracy? Use sum.
>
> * Adding floats with a high requirement for precision and accuracy?
> ? Use math.fsum.
>
> * Concatenating strings? Use ''.join.
>
> * Joining lists? Use [].extend.
>
> * Iterating over an arbitrary sequence of arbitrary sequences?
> ? Use itertools.chain.
>
> That's five different "its", and five obvious ways to do them.
>

Let's go through them...

> * Adding integers, decimals or fractions, or floats with a low
>   requirement for precision and accuracy? Use sum.
>

Pretty obvious.

 >>> sum([1, 2, 3])
 6



> * Adding floats with a high requirement for precision and accuracy?
>   Use math.fsum.
>

Mostly obvious.

 >>> fsum([1.234534665989, 2.987, 3])
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
 NameError: name 'fsum' is not defined
 >>> import math
 >>> math.fsum([1.234534665989, 2.987, 3])
 7.2215346659890001


> * Concatenating strings? Use ''.join.


Common pitfall:

 >>> ['abc', 'def', 'ghi'].join()
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
 AttributeError: 'list' object has no attribute 'join'
 >>> ''.join(['abc', 'def', 'ghi'])
 'abcdefghi'


> * Joining lists? Use [].extend.

Obvious, yes.  Convenient?  Not really.

 >>> start = []
 >>> for list in [[1, 2], [3, 4]]:
 ...   start.extend(list)
 ...
 >>> start
 [1, 2, 3, 4]

> * Iterating over an arbitrary sequence of arbitrary sequences?
>   Use itertools.chain.

 >>> group1 = ['al', 'bob']
 >>> group2 = ['cal']
 >>> groups = [group1, group2]

Obvious if you are Dutch...

 >>> itertools.chain(groups)
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
 NameError: name 'itertools' is not defined
 >>> import itertools
 >>> itertools.chain(groups)
 <itertools.chain object at 0x9a9658c>
 >>> len(itertools.chain(groups))
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
 TypeError: object of type 'itertools.chain' has no len()
 >>> len(list(itertools.chain(groups)))
 2
 >>> len(list(itertools.chain(*groups)))
 3

So you have sum, fsum, join, extend, and chain.

Sum is builtin, but you have to import fsum from math and chain from
itertools.

Join is actually a method on strings, not sequences.

Chain can take multiple lists, or you can use the splat operator on a
list of lists.

Extend is actually a method on lists, and it only takes one list, not
multiple ones.

 >>> [].extend(*groups)
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
 TypeError: extend() takes exactly one argument (2 given)

Just commit all that to memory, and enjoy the productivity of using a
high level language! ;)





From steven at REMOVE.THIS.cybersource.com.au  Mon Mar 29 23:01:03 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 30 Mar 2010 03:01:03 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
	<069f41e7-6a4a-4a40-b570-2559ca5ce69d@x11g2000prb.googlegroups.com>
	<4bb13a0c$0$8827$c3e8da3@news.astraweb.com>
	<bc431bd4-404d-4725-a96b-bbf00dba13bd@q23g2000yqd.googlegroups.com>
Message-ID: <pan.2010.03.30.03.01.03@REMOVE.THIS.cybersource.com.au>

On Mon, 29 Mar 2010 19:05:30 -0700, Steve Howell wrote:

>> > If nothing else, I think it's reasonably for users to expect
>> > symmetry.
>>
>> Why? What is symmetry in programming?
> 
> "Symmetry" is best shown by example.
> 
>  >>> 3 - 2
>  1
>  >>> set([1,2,3]) - set([2,3])
>  set([1])


That's a useless example.


>>> 42 - 10
32
>>> set([42]) - set([10])
set([42])


You don't define symmetry. You don't even give a sensible example of 
symmetry. Consequently I reject your argument that because sum is the 
obvious way to sum a lot of integers, "symmetry" implies that it should 
be the obvious way to concatenate a lot of lists.


>>> 1+2
3
>>> [1] + [2]
[1, 2]
>>> set([1]) + set([2])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for +: 'set' and 'set'


>> > If you can use "+" to concatentate lists, then it seems reasonable
>> > that something spelled "sum" would concatenate lists as well, and in
>> > reasonable time.
>>
>> Where do you get the "reasonable time" from?
>>
>>
> From common sense.  Concatenation of lists should be in O(M*N) time, not
> O(M*N*N), because there is no need to build intermediate lists.

You are correct that building intermediate lists isn't *compulsory*, 
there are alternatives, but the alternatives themselves have costs. 
Complexity itself is a cost. sum currently has nice simple semantics, 
which means you can reason about it: sum(sequence, start) is the same as 

total = start
for item in sequence:
    total = total + start
return total

You don't have to care what the items in sequence are, you don't have to 
make assumptions about what methods sequence and start have (beyond 
supporting iteration and addition). Adding special cases to sum means it 
becomes more complex and harder to reason about. If you pass some other 
sequence type in the middle of a bunch of lists, what will happen? Will 
sum suddenly break, or perhaps continue to work but inefficiently?

You still need to ask these questions with existing sum, but it is 
comparatively easy to answer them: you only need to consider how the 
alternative behaves when added to a list. You don't have to think about 
the technicalities of the sum algorithm itself -- sometimes it calls +, 
sometimes extend, sometimes +=, sometimes something else... which of the 
various different optimized branches will I fall into this time? Who 
knows? sum already has two branches. In my opinion, three branches is one 
too many.


[...]
>> > It only takes a handful of sublists, about ten on my box, to expose
>> > the limitation of the Shlemeil-the-Painter O(M*N*N) algorithm that's
>> > under the hood. ?It only takes 200 sublists to start getting a 10x
>> > degradation in performance.
>>
>> And how many times have you needed to add 200 sublists?
>>
>> How many times have you needed to add 10 sublists?
>>
>>
> Aggregating lists is a very common task in programming.  

"Aggregating" lists? Not summing them? I think you've just undercut your 
argument that sum is the "obvious" way of concatenating lists.

In natural language, we don't talk about "summing" lists, we talk about 
joining, concatenating or aggregating them. You have just done it 
yourself, and made my point for me. And this very thread started because 
somebody wanted to know what the equivalent to sum for sequences.

If sum was the obvious way to concatenate sequences, this thread wouldn't 
even exist.


> An example of a
> list of lists would be a list of departments, where each department is a
> list of employees.  If you want to sort the employees, you will want to
> aggregate to a list.

I grant you that 10 departments is likely to be a borderline case, but if 
you have 200 departments, then you will most likely be querying a 
database and getting back a single list of employees. And if you're not, 
you probably should be.


>> More special cases for implementers means more bugs in the language,
>> which means I end up writing my own code and ignoring the built-in
>> version anyway.
>>
>>
> Special cases do not have to introduce bugs in the language.

They don't *have* to, but since even Donald Knuth has written code with 
bugs in it, it is a safe bet that the number of bugs in code written by 
mere mortals will be roughly proportional to the complexity: more complex 
means more bugs. You can go to the bank with that.


>> More special cases means I have to pay the cost of high accuracy float
>> summation even when I don't need, or want, it.
>>
>>
> Nothing about making sum() work for the general cases precludes more
> specific, optimized functions.

You have missed my point. If I call your version of sum which all the 
special cases, I pay the overhead of the complexity regardless of whether 
I need it or not. The existence of other functions which duplicate the 
special cases in sum is irrelevant.



[...]
>> It's MORE costly than teaching users to use list.extend or
>> itertools.chain.
>>
>>
> Which the docs for sum() don't do.

Patches are always welcome.




-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Mon Mar 29 23:02:25 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 30 Mar 2010 03:02:25 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
	<4bb13580$0$8827$c3e8da3@news.astraweb.com>
	<7xtyryitu6.fsf@ruckus.brouhaha.com>
Message-ID: <pan.2010.03.30.03.02.25@REMOVE.THIS.cybersource.com.au>

On Mon, 29 Mar 2010 16:36:17 -0700, Paul Rubin wrote:

> Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
>> * Iterating over an arbitrary sequence of arbitrary sequences?
>>   Use itertools.chain.
> 
> chain is only for finite sequences.  For arbitrary sequences, use
> chain.from_iterable.

Correction noted. Obviously I'm not Dutch.


-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Mon Mar 29 23:29:11 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 30 Mar 2010 03:29:11 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
	<4bb13580$0$8827$c3e8da3@news.astraweb.com>
	<31c7977e-9c8d-4be0-ae21-3c490e6364fe@z35g2000yqd.googlegroups.com>
Message-ID: <pan.2010.03.30.03.29.11@REMOVE.THIS.cybersource.com.au>

On Mon, 29 Mar 2010 19:24:42 -0700, Patrick Maupin wrote:

> On Mar 29, 6:19?pm, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
>> How does the existence of math.fsum contradict the existence of sum?
> 
> You're exceptionally good at (probably deliberately) mis-interpreting
> what people write.

I cannot read your mind, I can only interpret the words you choose to 
write. You said 

[quote]
See, I think the very existence of math.fsum() already violates "there 
should be one obvious way to do it."
[end quote]


If sum satisfies the existence of one obvious way, how does math.fsum 
violate it? sum exists, and is obvious, regardless of whatever other 
solutions exist as well.



-- 
Steven


From pmaupin at gmail.com  Mon Mar 29 23:33:14 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 29 Mar 2010 20:33:14 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au> 
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com> 
	<4bb13580$0$8827$c3e8da3@news.astraweb.com>
	<31c7977e-9c8d-4be0-ae21-3c490e6364fe@z35g2000yqd.googlegroups.com>
	<pan.2010.03.30.03.29.11@REMOVE.THIS.cybersource.com.au>
Message-ID: <559a2ee3-fb2c-477f-a444-7edbb6da8676@r1g2000yqj.googlegroups.com>

On Mar 29, 10:29?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 29 Mar 2010 19:24:42 -0700, Patrick Maupin wrote:
> > On Mar 29, 6:19?pm, Steven D'Aprano <st... at REMOVE-THIS-
> > cybersource.com.au> wrote:
> >> How does the existence of math.fsum contradict the existence of sum?
>
> > You're exceptionally good at (probably deliberately) mis-interpreting
> > what people write.
>
> I cannot read your mind, I can only interpret the words you choose to
> write. You said
>
> [quote]
> See, I think the very existence of math.fsum() already violates "there
> should be one obvious way to do it."
> [end quote]
>
> If sum satisfies the existence of one obvious way, how does math.fsum
> violate it? sum exists, and is obvious, regardless of whatever other
> solutions exist as well.

Because sum() is the obvious way to sum floats; now the existence of
math.fsum() means there are TWO obvious ways to sum floats.  Is that
really that hard to understand?  How can you misconstrue this so badly
that you write something that can be (easily) interpreted to mean that
you think that I think that once math.fsum() exists, sum() doesn't
even exist any more????


From showell30 at yahoo.com  Mon Mar 29 23:34:17 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Mon, 29 Mar 2010 20:34:17 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au> 
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com> 
	<069f41e7-6a4a-4a40-b570-2559ca5ce69d@x11g2000prb.googlegroups.com> 
	<4bb13a0c$0$8827$c3e8da3@news.astraweb.com>
	<bc431bd4-404d-4725-a96b-bbf00dba13bd@q23g2000yqd.googlegroups.com>
	<pan.2010.03.30.03.01.03@REMOVE.THIS.cybersource.com.au>
Message-ID: <3c7ed32c-201f-41c8-bd46-4bf3092a3d6f@x12g2000yqx.googlegroups.com>

On Mar 29, 8:01?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> You don't define symmetry. You don't even give a sensible example of
> symmetry. Consequently I reject your argument that because sum is the
> obvious way to sum a lot of integers, "symmetry" implies that it should
> be the obvious way to concatenate a lot of lists.
>

You are not rejecting my argument; you are rejecting an improper
paraphrase of my argument.

My argument was that repeated use of "+" is spelled "sum" for
integers, so it's natural to expect the same name for repeated use of
"+" on lists.  Python already allows for this symmetry, just SLOWLY.

>
> You are correct that building intermediate lists isn't *compulsory*,
> there are alternatives, but the alternatives themselves have costs.
> Complexity itself is a cost. sum currently has nice simple semantics,
> which means you can reason about it: sum(sequence, start) is the same as
>
> total = start
> for item in sequence:
> ? ? total = total + start
> return total
>

I could just as reasonably expect these semantics:

 total = start
 for item in sequence:
   total += start
 return total

Python does not contradict my expectations here:

 >>> start = []
 >>> x = sum([], start)
 >>> x.append(1)
 >>> start
 [1]

> You don't have to care what the items in sequence are, you don't have to
> make assumptions about what methods sequence and start have (beyond
> supporting iteration and addition).

The only additional assumption I'm making is that Python can take
advantage of in-place addition, which is easy to introspect.

> Adding special cases to sum means it
> becomes more complex and harder to reason about. If you pass some other
> sequence type in the middle of a bunch of lists, what will happen? Will
> sum suddenly break, or perhaps continue to work but inefficiently?

This is mostly a red herring, as I would tend to use sum() on
sequences of homogenous types.

Python already gives me the power to shoot myself in the foot for
strings.

 >>> list = [1, 2]
 >>> list += "foo"
 >>> list
 [1, 2, 'f', 'o', 'o']

 >>> lst = [1,2]
 >>> lst.extend('foo')
 >>> lst
 [1, 2, 'f', 'o', 'o']

I'd prefer to get an exception for cases where += would do the same.

>>> start = []
>>> bogus_example = [[1, 2], None, [3]]
>>> for item in bogus_example: start += item
...
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'NoneType' object is not iterable



> You still need to ask these questions with existing sum, but it is
> comparatively easy to answer them: you only need to consider how the
> alternative behaves when added to a list. You don't have to think about
> the technicalities of the sum algorithm itself -- sometimes it calls +,
> sometimes extend, sometimes +=, sometimes something else

I would expect sum() to support the same contract as +=, which already
works for numerics (so no backward incompatibility), and which already
works for lists.  For custom-designed classes, I would rely on the
promise that augmented assignment falls back to normal methods.

> ... which of the
> various different optimized branches will I fall into this time? Who
> knows? sum already has two branches. In my opinion, three branches is one
> too many.

As long as it falls into the branch that works, I'm happy. :)

>
> "Aggregating" lists? Not summing them? I think you've just undercut your
> argument that sum is the "obvious" way of concatenating lists.
>
> In natural language, we don't talk about "summing" lists, we talk about
> joining, concatenating or aggregating them. You have just done it
> yourself, and made my point for me.

Nor do you use "chain" or "extend."

> And this very thread started because
> somebody wanted to know what the equivalent to sum for sequences.
>
> If sum was the obvious way to concatenate sequences, this thread wouldn't
> even exist.

This thread is entitled "sum for sequences."  I think you just made my
point.



From steven at REMOVE.THIS.cybersource.com.au  Mon Mar 29 23:49:46 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 30 Mar 2010 03:49:46 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
	<069f41e7-6a4a-4a40-b570-2559ca5ce69d@x11g2000prb.googlegroups.com>
	<4bb13a0c$0$8827$c3e8da3@news.astraweb.com>
	<8dac78c8-124a-4b02-9944-6d577bfac84f@15g2000yqi.googlegroups.com>
Message-ID: <pan.2010.03.30.03.49.46@REMOVE.THIS.cybersource.com.au>

On Mon, 29 Mar 2010 19:31:44 -0700, Patrick Maupin wrote:

> It's about a lack of surprises.  Which, 99% of the time, Python excels
> at.  This is why many of us program in Python.  This is why some of us
> who would never use sum() on lists, EVEN IF IT WERE FIXED TO NOT BE SO
> OBNOXIOUSLY SLOW, advocate that it, in fact, be fixed to not be so
> obnoxiously slow.

As I said, patches are welcome. Personally, I expect that it would be 
rejected, but that's not my decision to make, and who knows, perhaps I'm 
wrong and you'll have some of the Python-Dev people support your idea.

sum is not designed to work with lists. It happens to work because lists 
happen to use + for concatenation, and because it is too much trouble for 
too little benefit to explicitly exclude lists in the same way sum 
explicitly excludes strings. In the Python philosophy, simplicity of 
implementation is a virtue: the code that is not there contributes 
exactly no bugs and has precisely no overhead.

sum has existed as a Python built-in for many years -- by memory, since 
Python 2.2, which was nearly nine years ago. Unlike the serious gotcha of 
repeated string concatenation:


# DO NOT DO THIS
result = ""
for s in items:
    result += s


which *does* cause real problems in real code, I don't believe that there 
have been any significant problems caused by summing lists of lists. As 
problems go, it is such a minor one that it isn't worth this discussion, 
let alone fixing it. But if anyone disagrees, this is open source, go 
ahead and fix it. You don't need my permission.



-- 
Steven


From gagsl-py2 at yahoo.com.ar  Tue Mar 30 00:00:16 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 30 Mar 2010 01:00:16 -0300
Subject: GIF89A and PIL
References: <2010032618455468300-aptshansen@gmailinvalid>
	<87oci9hjz9.fsf@dpt-info.u-strasbg.fr>
	<2010032719445464825-aptshansen@gmailinvalid>
	<81b39uFggeU1@mid.individual.net>
Message-ID: <op.vac32qocx6zn5v@lepton.softlabbsas.com.ar>

En Mon, 29 Mar 2010 04:41:23 -0300, Gregory Ewing  
<greg.ewing at canterbury.ac.nz> escribi?:
> Stephen Hansen wrote:
>
>> So I wonder if there's just some hyper-optimization Photoshop does that  
>> PIL can't round-trip.
>
> You may find that PIL isn't bothering to compress at all,
> or only doing it in a very simpleminded way.

Indeed.
Fredrik Lundh, in  
http://mail.python.org/pipermail/image-sig/1998-July/000506.html

"When writing GIF files, PIL uses a simpleminded encoding that, by some
odd reason, LZW decoders have no trouble reading.  To write compressed
GIF files, there are a number of options:

     -- install NETPBM, and hack GifImagePlugin so it uses _save_ppm instead
        of _save (just remove "_ppm" from the latter).
     -- write an _imaging_gif module that takes a PIL image and writes
        a GIF version of it.  how you implement that is up to you..."

After twelve years the above comments are still applicable.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Tue Mar 30 00:36:52 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 30 Mar 2010 01:36:52 -0300
Subject: xpat error in xmlrp client. How to inspect data.
References: <4bab1f4a$0$25677$426a74cc@news.free.fr>
Message-ID: <op.vac5rqfxx6zn5v@lepton.softlabbsas.com.ar>

En Thu, 25 Mar 2010 05:31:05 -0300, News123 <news1234 at free.fr> escribi?:

> I'm havign a small xmlrpc client, which works normally fine.
> (xmlrpc via https)
>
> Sometimes however I receive an Exception about an expat error.
>
>
> The output, that I receive is:
>   File "C:\mycode\myrpcclient.py", line 63, in upload_chunk
>     rslt = myrpcclient.call()
>   File "C:\Python26\lib\xmlrpclib.py", line 1199, in __call__
>     return self.__send(self.__name, args)
>   File "C:\Python26\lib\xmlrpclib.py", line 1489, in __request
>     verbose=self.__verbose
>   File "C:\Python26\lib\xmlrpclib.py", line 1253, in request
>     return self._parse_response(h.getfile(), sock)
>   File "C:\Python26\lib\xmlrpclib.py", line 1387, in _parse_response
>     p.feed(response)
>   File "C:\Python26\lib\xmlrpclib.py", line 601, in feed
>     self._parser.Parse(data, 0)
> ExpatError: syntax error: line 1, column 0
>
>
> In order to continue debugging I'd like to dump the received http data,
> which "C:\Python26\lib\xmlrpclib.py", line 601 tried to parse without
> succes.
>
> How can I do this?

a) Use the standard cgitb module (despite its name, it is useful outside  
CGI scripts)

b) Use the tb module available from http://pypi.python.org/pypi/tb

Both provide a more verbose traceback, including local variables at each  
execution frame.

c) Replace ("monkey-patch") the feed() method with a more debug-friendly  
version:

def feed(self, data):
   try:
     self._parser.Parse(data, 0)
   except xmlrpclib.expat.ExpatError, e:
     e.args += (data,)
     raise

xmlrpclib.ExpatParser.feed = feed

(Or perhaps set e.data = data)

d) In your exception handler, walk the traceback object until you reach  
the feed() call, and inspect the corresponding tb_frame.f_locals  
dictionary.


-- 
Gabriel Genellina



From cs at zip.com.au  Tue Mar 30 00:41:11 2010
From: cs at zip.com.au (Cameron Simpson)
Date: Tue, 30 Mar 2010 15:41:11 +1100
Subject: GIF89A and PIL
In-Reply-To: <2010032719445464825-aptshansen@gmailinvalid>
References: <2010032719445464825-aptshansen@gmailinvalid>
Message-ID: <20100330044111.GA684@cskk.homeip.net>

On 27Mar2010 19:44, Stephen Hansen <apt.shansen at gmail.invalid> wrote:
| Yeah, I don't expect much from PNG. The images are very small but I
| might be sending a LOT of them over a pipe which is fairly tight, so
| 50-60 bytes matters. That's why I selected GIF.

How well does a stream of XPM files compress? Probably not enough, I
would guess. Just wondering.

Do you need to move a "standard" image format around? If everything's
16x16 8 bit colour (and if, with luck, they share a colour map) maybe
you can ship raw bytes expressing what you want.

How colourful are these GIFs?
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

What I want is Facts. Teach these boys and girls nothing but Facts.  Facts
alone are wanted in life. Plant nothing else, and root out everything else.
        - Charles Dickens    John Huffam   1812-1870  Hard Times [1854]


From kse.listed.co1 at gmail.com  Tue Mar 30 00:41:38 2010
From: kse.listed.co1 at gmail.com (Naeem)
Date: Mon, 29 Mar 2010 21:41:38 -0700 (PDT)
Subject: "jobs in saudi arabia universities" "jobs in saudi arabia for 
	pakistanis" "jobs in saudi" "saudi jobs" "saudi job vacancies" "saudi
	job visa" "saudi job consultants" "saudi jobs site" "jobs site" on 
	http://jobsinsaudiarabia-net.blogspot.com/
Message-ID: <fd2e1a35-02eb-4daf-afe2-ad78aacbd828@y11g2000prf.googlegroups.com>

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From vinni at altern.org  Tue Mar 30 01:47:40 2010
From: vinni at altern.org (Vincent MAILLE)
Date: Mon, 29 Mar 2010 22:47:40 -0700 (PDT)
Subject: PyScripter Logo
Message-ID: <9483843a-e855-4648-ae69-fef9e7006ffd@z3g2000yqz.googlegroups.com>

Hi,

Where can I find a image of the snake PyScipter in high quality ?

Thnaks,

Vincent


From steven at REMOVE.THIS.cybersource.com.au  Tue Mar 30 02:41:51 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 30 Mar 2010 06:41:51 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
	<4bb13580$0$8827$c3e8da3@news.astraweb.com>
	<fea04f68-dfda-4ff5-8562-7a3e967fb732@y33g2000pre.googlegroups.com>
Message-ID: <pan.2010.03.30.06.41.51@REMOVE.THIS.cybersource.com.au>

On Mon, 29 Mar 2010 19:53:04 -0700, Steve Howell wrote:

> On Mar 29, 4:19?pm, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
[...]
>> Python is under no compulsion to make "the obvious way" obvious to
>> anyone except Guido. It's a bonus if it happens to be obvious to
>> newbies, not a requirement.
>>
>> And besides, what is "it" you're talking about?
>>
>> * Adding integers, decimals or fractions, or floats with a low
>> ? requirement for precision and accuracy? Use sum.
>>
>> * Adding floats with a high requirement for precision and accuracy?
>> ? Use math.fsum.
>>
>> * Concatenating strings? Use ''.join.
>>
>> * Joining lists? Use [].extend.
>>
>> * Iterating over an arbitrary sequence of arbitrary sequences?
>> ? Use itertools.chain.
>>
>> That's five different "its", and five obvious ways to do them.
>>
>>
> Let's go through them...

"Obvious" doesn't mean you don't have to learn the tools you use. It 
doesn't mean that there's no need to think about the requirements of your 
problem. It doesn't even mean that the way to do it has to be a built-in 
or pre-built solution in the standard library, or that somebody with no 
Python experience could intuit the correct function to use based on 
nothing more than a good grasp of English.

It certainly doesn't mean that users shouldn't be expected to know how to 
import a module:


>  >>> fsum([1.234534665989, 2.987, 3])
>  Traceback (most recent call last):
>    File "<stdin>", line 1, in <module>
>  NameError: name 'fsum' is not defined

I called it math.fsum every time I referred to it. Did I need to specify 
that you have to import the math module first?


>> * Concatenating strings? Use ''.join.
> 
> 
> Common pitfall:
> 
>  >>> ['abc', 'def', 'ghi'].join()
>  Traceback (most recent call last):
>    File "<stdin>", line 1, in <module>
>  AttributeError: 'list' object has no attribute 'join'

Is it really common?

I've been hanging around this newsgroup for many years now, and I don't 
believe I've ever seen anyone confused by this. I've seen plenty of 
newbies use repeated string concatenation, but never anyone trying to do 
a string join and getting it wrong. If you have any links to threads 
showing such confusion, I'd be grateful to see them.


>> * Joining lists? Use [].extend.
> 
> Obvious, yes.  Convenient?  Not really.
> 
>  >>> start = []
>  >>> for list in [[1, 2], [3, 4]]:
>  ...   start.extend(list)
>  ...
>  >>> start
>  [1, 2, 3, 4]


Why isn't that convenient? It is an obvious algorithm written in three 
short lines. If you need a one-liner, write a function and call it:

concatenate_lists(sequence_of_lists)


 
>> * Iterating over an arbitrary sequence of arbitrary sequences?
>>   Use itertools.chain.
> 
>  >>> group1 = ['al', 'bob']
>  >>> group2 = ['cal']
>  >>> groups = [group1, group2]
> 
> Obvious if you are Dutch...

Or are familiar with the itertools module and the Pythonic practice of 
iterating over lazy sequences. Iterators and itertools are fundamental to 
the Pythonic way of doing things.



>  >>> itertools.chain(groups)
>  Traceback (most recent call last):
>    File "<stdin>", line 1, in <module>
>  NameError: name 'itertools' is not defined

That's the second time you've either mistakenly neglected to import a 
module, or deliberately not imported it to make the rhetorical point that 
you have to import a module before using it. Yes, you *do* have to import 
modules before using them. What's your point? Not everything has to be a 
built-in.



[...]
> Sum is builtin, but you have to import fsum from math and chain from
> itertools.
>
> Join is actually a method on strings, not sequences.

Is that supposed to be an argument against them?



[...]
> Just commit all that to memory, and enjoy the productivity of using a
> high level language! ;)

If you don't know your tools, you will spend your life hammering screws 
in with the butt of your saw. It will work, for some definition of work. 
Giving saws heavier, stronger handles to make it faster to hammer screws 
is not what I consider good design.



-- 
Steven


From no.email at nospam.invalid  Tue Mar 30 02:55:55 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Mon, 29 Mar 2010 23:55:55 -0700
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
	<4bb13580$0$8827$c3e8da3@news.astraweb.com>
	<fea04f68-dfda-4ff5-8562-7a3e967fb732@y33g2000pre.googlegroups.com>
	<pan.2010.03.30.06.41.51@REMOVE.THIS.cybersource.com.au>
Message-ID: <7xr5n2i9hg.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
>>>> ...
>>> ...
>> ...
> "Obvious" doesn't mean you don't have to learn the tools you use....

Geez you guys, get a room ;-).  You're all good programmers with too
much experience for this arguing over stuff this silly.


From loveguruworld7 at gmail.com  Tue Mar 30 03:05:01 2010
From: loveguruworld7 at gmail.com (love guru 4 world)
Date: Tue, 30 Mar 2010 00:05:01 -0700 (PDT)
Subject: Watch Angelina Jolie's sex scandal videos at her house
Message-ID: <67a85379-1f60-4028-b812-4650fb3fc719@a16g2000pre.googlegroups.com>

Watch Angelina Jolie's sex scandal videos at her house

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From keeloh at rocketmail.com  Tue Mar 30 03:33:01 2010
From: keeloh at rocketmail.com (POOJA)
Date: Tue, 30 Mar 2010 00:33:01 -0700 (PDT)
Subject: Help Desk Software by PerlDesk
Message-ID: <e688d5ce-162e-4536-8ba9-d3b24b27afbe@k24g2000pro.googlegroups.com>

Help Desk Software by PerlDesk
------------------------

http://sites.google.com/site/freehelpdesksoftware


From chris at simplistix.co.uk  Tue Mar 30 04:03:00 2010
From: chris at simplistix.co.uk (Chris Withers)
Date: Tue, 30 Mar 2010 09:03:00 +0100
Subject: PyDispatcher on sourceforge doesn't play nice with easy_install
Message-ID: <4BB1B034.9020905@simplistix.co.uk>

Hi All,

Using easy_install to get PyDispatcher results in:

Searching for PyDispatcher
Reading http://pypi.python.org/simple/PyDispatcher/
Reading http://pydispatcher.sourceforge.net
Reading https://sourceforge.net/project/showfiles.php?group_id=79755
Reading http://sourceforge.net/projects/pydispatcher/files/pydispatcher/
Best match: PyDispatcher 2.0.1
Downloading 
http://sourceforge.net/projects/pydispatcher/files/pydispatcher/2.0.1/PyDispatcher-2.0.1-py2.5.egg/download
Processing download
error: Couldn't find a setup script in /tmp/easy_install-ioAdEo/download

Who's the maintainer of PyDispatcher nowadays? Would be handy if they 
removed the sourceforge link from pypi.

In the meantime, the following works around the problem:

easy_install PyDispatcher -H *.python.org

cheers,

Chris



From steven at REMOVE.THIS.cybersource.com.au  Tue Mar 30 04:06:09 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 30 Mar 2010 08:06:09 GMT
Subject: PyScripter Logo
References: <9483843a-e855-4648-ae69-fef9e7006ffd@z3g2000yqz.googlegroups.com>
Message-ID: <pan.2010.03.30.08.06.08@REMOVE.THIS.cybersource.com.au>

On Mon, 29 Mar 2010 22:47:40 -0700, Vincent MAILLE wrote:

> Where can I find a image of the snake PyScipter in high quality ?

Did you mean PyScripter (note spelling)? If so, then googling for 
PyScripter brings me to the PyScripter project, which has contact 
details. You should ask the project author.


-- 
Steven


From jeanmichel at sequans.com  Tue Mar 30 05:03:06 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Tue, 30 Mar 2010 11:03:06 +0200
Subject: "Usability, the Soul of Python"
In-Reply-To: <4bb14173$0$1640$742ec2ed@news.sonic.net>
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
	<4bb14173$0$1640$742ec2ed@news.sonic.net>
Message-ID: <4BB1BE4A.50407@sequans.com>

John Nagle wrote:
> Jonathan Hayward wrote:
>> I've posted "Usability, the Soul of Python: An Introduction to the
>> Python Programming Language Through the Eyes of Usability", at:
>>
>>    http://JonathansCorner.com/python/
>
>    No, it's just a rather verbose introduction to Python, in dark brown
> type on a light brown background.  One could write a good paper on this
> topic, but this isn't it.
>
>
>                 John Nagle
Why is it bad ?

JM


From steve at REMOVE-THIS-cybersource.com.au  Tue Mar 30 06:10:55 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 30 Mar 2010 10:10:55 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
	<4bb13580$0$8827$c3e8da3@news.astraweb.com>
	<fea04f68-dfda-4ff5-8562-7a3e967fb732@y33g2000pre.googlegroups.com>
	<pan.2010.03.30.06.41.51@REMOVE.THIS.cybersource.com.au>
	<7xr5n2i9hg.fsf@ruckus.brouhaha.com>
Message-ID: <4bb1ce2e$0$8827$c3e8da3@news.astraweb.com>

On Mon, 29 Mar 2010 23:55:55 -0700, Paul Rubin wrote:

> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
>>>>> ...
>>>> ...
>>> ...
>> "Obvious" doesn't mean you don't have to learn the tools you use....
> 
> Geez you guys, get a room ;-).  You're all good programmers with too
> much experience for this arguing over stuff this silly.

Yes Mum ;)


You're right of course. I spend too much time being this guy:

http://xkcd.com/386/

and not enough this one:

http://xkcd.com/167/


-- 
Steven


From am8734200 at gmail.com  Tue Mar 30 06:19:33 2010
From: am8734200 at gmail.com (a m)
Date: Tue, 30 Mar 2010 03:19:33 -0700 (PDT)
Subject: It's a fact not lost on the opportunity to see yourself
Message-ID: <49471fea-67f2-476a-93cf-1e9f9eabfcb7@i25g2000yqm.googlegroups.com>

http://www.google.com/url?sa=D&q=http://www.google.com/url%3Fsa%3DD%26q%3Dhttp://osamah2000.jeeran.com/daauageralmuslmeen1.htm%26usg%3DAFQjCNGQhhGz-1TGv9Y7gE8zKwHHustJCg&usg=AFQjCNH5ZzXRqkh5EGL1dsjQxcjNQCmAEQ


From malte.usenet at web.de  Tue Mar 30 07:17:21 2010
From: malte.usenet at web.de (Malte Dik)
Date: Tue, 30 Mar 2010 13:17:21 +0200
Subject: "Usability, the Soul of Python"
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
	<4bb14173$0$1640$742ec2ed@news.sonic.net>
	<mailman.1300.1269939807.23598.python-list@python.org>
Message-ID: <81e4u2F7ubU1@mid.dfncis.de>

> Why is it bad ?
> 

Not working code, examples, that are weird to read, and a lot of text :)




From lie.1296 at gmail.com  Tue Mar 30 07:23:32 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Tue, 30 Mar 2010 22:23:32 +1100
Subject: StringChain -- a data structure for managing large sequences
	ofchunks of bytes
In-Reply-To: <4baf6ec6$0$8756$c3e8da3@news.astraweb.com>
References: <mailman.646.1268377905.23598.python-list@python.org>	<4b9a00ce$0$27822$c3e8da3@news.astraweb.com>	<mailman.1055.1269234593.23598.python-list@python.org>	<pan.2010.03.22.08.07.48@REMOVE.THIS.cybersource.com.au>	<4bae6130$1@dnews.tpgi.com.au>
	<4baf6ec6$0$8756$c3e8da3@news.astraweb.com>
Message-ID: <4bb1df60$1@dnews.tpgi.com.au>

On 03/29/2010 01:59 AM, Steven D'Aprano wrote:
> On Sun, 28 Mar 2010 06:48:21 +1100, Lie Ryan wrote:
> 
>> On 03/22/2010 07:07 PM, Steven D'Aprano wrote:
>>> Perhaps you should have said that it was a wrapper around deque giving
>>> richer functionality, rather than giving the impression that it was a
>>> brand new data structure invented by you. People are naturally going to
>>> be more skeptical about a newly invented data structure than one based
>>> on a reliable, component like deque.
>>
>> Well, technically StringChain is not a data structure in the first
>> place. StringChain is a string;
> 
> And strings are data structures, as are arrays and structs. Just because 
> they're simple data structures made directly from primitives rather than 
> rich, complex structures, doesn't mean they're not data structures.

Array is a way to structure data and thus a data structure; array is the
concept of structuring data using contiguous memory with elements
addressed by an index. string is just a contiguous memory reserved to
store data, or in other words: string is an array. This is what I meant
when I said string is not itself a data structure.

>> a string that is implemented using deque
>> data structure to make appending algorithmically efficient. It is not a
>> data structure, in the sense that I can't put arbitrary "thing" into the
>> data structure. 
> 
> Any "thing" that can be pickled or serialised can be put into a string.

Fair enough, you're right to think so but IMHO I disagree. Streams (or
perhaps 'blob' to avoid the connotation of FIFO) are the data structure
which you can put anything pickleable/serialisable into, but string (the
implementation of stream/blob using array) are just a special case of
array data structure and not a different, separate data structure than
array.

Perhaps I should not make such a bold claim as saying string is not data
structure; what I have in mind is that string is just a special case of
array and not distinctly separate data structure than array.


From steve at holdenweb.com  Tue Mar 30 07:33:37 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 30 Mar 2010 07:33:37 -0400
Subject: sum for sequences?
In-Reply-To: <4bb1ce2e$0$8827$c3e8da3@news.astraweb.com>
References: <hodb43$pt$1@reader1.panix.com>	<7x1vf91f60.fsf@ruckus.brouhaha.com>	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>	<hoo1k4$cia$1@news.eternal-september.org>	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>	<4bb13580$0$8827$c3e8da3@news.astraweb.com>	<fea04f68-dfda-4ff5-8562-7a3e967fb732@y33g2000pre.googlegroups.com>	<pan.2010.03.30.06.41.51@REMOVE.THIS.cybersource.com.au>	<7xr5n2i9hg.fsf@ruckus.brouhaha.com>
	<4bb1ce2e$0$8827$c3e8da3@news.astraweb.com>
Message-ID: <4BB1E191.9040909@holdenweb.com>

Steven D'Aprano wrote:
> On Mon, 29 Mar 2010 23:55:55 -0700, Paul Rubin wrote:
> 
>> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
>>>>>> ...
>>>>> ...
>>>> ...
>>> "Obvious" doesn't mean you don't have to learn the tools you use....
>> Geez you guys, get a room ;-).  You're all good programmers with too
>> much experience for this arguing over stuff this silly.
> 
> Yes Mum ;)
> 
> 
> You're right of course. I spend too much time being this guy:
> 
> http://xkcd.com/386/
> 
> and not enough this one:
> 
> http://xkcd.com/167/
> 
> 
Yeah, it can happen to all of us. I've certainly been "that guy" too.
But Steven, surely now it's time to *show us the squirrels*

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/


From steve at holdenweb.com  Tue Mar 30 07:33:37 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 30 Mar 2010 07:33:37 -0400
Subject: sum for sequences?
In-Reply-To: <4bb1ce2e$0$8827$c3e8da3@news.astraweb.com>
References: <hodb43$pt$1@reader1.panix.com>	<7x1vf91f60.fsf@ruckus.brouhaha.com>	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>	<hoo1k4$cia$1@news.eternal-september.org>	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>	<4bb13580$0$8827$c3e8da3@news.astraweb.com>	<fea04f68-dfda-4ff5-8562-7a3e967fb732@y33g2000pre.googlegroups.com>	<pan.2010.03.30.06.41.51@REMOVE.THIS.cybersource.com.au>	<7xr5n2i9hg.fsf@ruckus.brouhaha.com>
	<4bb1ce2e$0$8827$c3e8da3@news.astraweb.com>
Message-ID: <4BB1E191.9040909@holdenweb.com>

Steven D'Aprano wrote:
> On Mon, 29 Mar 2010 23:55:55 -0700, Paul Rubin wrote:
> 
>> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
>>>>>> ...
>>>>> ...
>>>> ...
>>> "Obvious" doesn't mean you don't have to learn the tools you use....
>> Geez you guys, get a room ;-).  You're all good programmers with too
>> much experience for this arguing over stuff this silly.
> 
> Yes Mum ;)
> 
> 
> You're right of course. I spend too much time being this guy:
> 
> http://xkcd.com/386/
> 
> and not enough this one:
> 
> http://xkcd.com/167/
> 
> 
Yeah, it can happen to all of us. I've certainly been "that guy" too.
But Steven, surely now it's time to *show us the squirrels*

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From lie.1296 at gmail.com  Tue Mar 30 07:39:41 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Tue, 30 Mar 2010 22:39:41 +1100
Subject: Classes as namespaces?
In-Reply-To: <52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
References: <hoihgt$p6t$1@reader1.panix.com>
	<69463be0-d839-43cf-a8a7-1cc9081f672d@r27g2000yqn.googlegroups.com>
	<52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
Message-ID: <4bb1e329$1@dnews.tpgi.com.au>

On 03/27/2010 10:28 PM, Jonathan Hartley wrote:
> one might like to name the complex block of logic, just to make it
> readable:
> 
> 
> x = 1
> def account_for_non_square_pixels(x):
>    ((some complex logic))
> account_for_non_square_pixels()
> y = 2
> 
> 
> But defining and then calling the function like that is a tad
> cumbersome. So I was wondering about:
> 


I never liked the narrow definition of function as "reusable piece of
code". This narrow definition implies that a piece of code used only
once do not need to be made a function.

I would rather define function as "a logically independent piece of
code" and encourage refactorizing code into functions even if they are
only used once as long as they are conceptually a "step" and being able
to reuse code as a nice side-effect of it.

Under this definition, the "some complex logic" conceptually is an
independent piece of code that can (and probably should) be factorized.


From alfps at start.no  Tue Mar 30 07:40:22 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Tue, 30 Mar 2010 13:40:22 +0200
Subject: "Usability, the Soul of Python"
In-Reply-To: <mailman.1300.1269939807.23598.python-list@python.org>
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>	<4bb14173$0$1640$742ec2ed@news.sonic.net>
	<mailman.1300.1269939807.23598.python-list@python.org>
Message-ID: <hosnrh$6na$1@news.eternal-september.org>

* Jean-Michel Pichavant:
> John Nagle wrote:
>> Jonathan Hayward wrote:
>>> I've posted "Usability, the Soul of Python: An Introduction to the
>>> Python Programming Language Through the Eyes of Usability", at:
>>>
>>>    http://JonathansCorner.com/python/
>>
>>    No, it's just a rather verbose introduction to Python, in dark brown
>> type on a light brown background.  One could write a good paper on this
>> topic, but this isn't it.
>>
>>
>>                 John Nagle
> Why is it bad ?

Consider


<quote>
 From a usability standpoint, the braces go with the lines to print out the 
stanza rather than the for statement or the code after, so the following is best:

for(i = 99; i > 0; ++i)
     {
     printf("%d slabs of spam in my mail!\n", i);
     printf("%d slabs of spam,\n", i);
     printf("Send one to abuse and Just Hit Delete,\n");
     printf("%d slabs of spam in my mail!\n\n", i + 1);
     }
</quote>


This is just unsubstantiated opinion, but worse, it makes a tacit assumption 
that there is "best" way to do indentation. However, most programmers fall into 
that trap, and I've done it myself. In fact, when I worked as a consultant (then 
in Andersen Consulting, now Accenture) I used the style above. Petter 
Hesselberg, author of "Industrial Strength Windows Programming" (heh, I'm 
mentioned) asked my why on Earth I did that, like, nobody does that? It was a 
habit I'd picked up in Pascal, from very na?ve considerations of parse nesting 
levels, a kind of misguided idealism instead of more practical pragmatism, but 
since I realized that that was an incredibly weak argument I instead answered by 
pointing towards Charles Petzold's code in his "Programming Windows" books. And 
amazingly I was allowed to continue using this awkward and impractical style.

I may or may not have been responsible for the similarly impractical compromise 
convention of using three spaces per indentation level. At least, in one big 
meeting the question about number of spaces was raised by the speaker, and I 
replied from the benches, just in jest, "three!". And that was it (perhaps).


Cheers,

- Alf  (admitting to earlier mistakes)


From contact at xavierho.com  Tue Mar 30 08:11:05 2010
From: contact at xavierho.com (Xavier Ho)
Date: Tue, 30 Mar 2010 22:11:05 +1000
Subject: "Usability, the Soul of Python"
In-Reply-To: <hosnrh$6na$1@news.eternal-september.org>
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
	<4bb14173$0$1640$742ec2ed@news.sonic.net>
	<mailman.1300.1269939807.23598.python-list@python.org> 
	<hosnrh$6na$1@news.eternal-september.org>
Message-ID: <2d56febf1003300511h617d7487t1bee6f69c6722a17@mail.gmail.com>

Did no one notice that

for(i = 99; i > 0; ++i)

Gives you an infinite loop (sort of) because i starts a 99, and increases
every loop?

Cheers,

Ching-Yun Xavier Ho, Technical Artist

Contact Information
Mobile: (+61) 04 3335 4748
Skype ID: SpaXe85
Email: contact at xavierho.com
Website: http://xavierho.com/


On Tue, Mar 30, 2010 at 9:40 PM, Alf P. Steinbach <alfps at start.no> wrote:

> * Jean-Michel Pichavant:
>
>> John Nagle wrote:
>>
>>> Jonathan Hayward wrote:
>>>
>>>> I've posted "Usability, the Soul of Python: An Introduction to the
>>>> Python Programming Language Through the Eyes of Usability", at:
>>>>
>>>>   http://JonathansCorner.com/python/
>>>>
>>>
>>>   No, it's just a rather verbose introduction to Python, in dark brown
>>> type on a light brown background.  One could write a good paper on this
>>> topic, but this isn't it.
>>>
>>>
>>>                John Nagle
>>>
>> Why is it bad ?
>>
>
> Consider
>
>
> <quote>
> From a usability standpoint, the braces go with the lines to print out the
> stanza rather than the for statement or the code after, so the following is
> best:
>
> for(i = 99; i > 0; ++i)
>    {
>    printf("%d slabs of spam in my mail!\n", i);
>    printf("%d slabs of spam,\n", i);
>    printf("Send one to abuse and Just Hit Delete,\n");
>    printf("%d slabs of spam in my mail!\n\n", i + 1);
>    }
> </quote>
>
>
> This is just unsubstantiated opinion, but worse, it makes a tacit
> assumption that there is "best" way to do indentation. However, most
> programmers fall into that trap, and I've done it myself. In fact, when I
> worked as a consultant (then in Andersen Consulting, now Accenture) I used
> the style above. Petter Hesselberg, author of "Industrial Strength Windows
> Programming" (heh, I'm mentioned) asked my why on Earth I did that, like,
> nobody does that? It was a habit I'd picked up in Pascal, from very na?ve
> considerations of parse nesting levels, a kind of misguided idealism instead
> of more practical pragmatism, but since I realized that that was an
> incredibly weak argument I instead answered by pointing towards Charles
> Petzold's code in his "Programming Windows" books. And amazingly I was
> allowed to continue using this awkward and impractical style.
>
> I may or may not have been responsible for the similarly impractical
> compromise convention of using three spaces per indentation level. At least,
> in one big meeting the question about number of spaces was raised by the
> speaker, and I replied from the benches, just in jest, "three!". And that
> was it (perhaps).
>
>
> Cheers,
>
> - Alf  (admitting to earlier mistakes)
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From steve at holdenweb.com  Tue Mar 30 09:46:20 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 30 Mar 2010 09:46:20 -0400
Subject: StringChain -- a data structure for managing large sequences
	ofchunks of bytes
In-Reply-To: <4bb1df60$1@dnews.tpgi.com.au>
References: <mailman.646.1268377905.23598.python-list@python.org>	<4b9a00ce$0$27822$c3e8da3@news.astraweb.com>	<mailman.1055.1269234593.23598.python-list@python.org>	<pan.2010.03.22.08.07.48@REMOVE.THIS.cybersource.com.au>	<4bae6130$1@dnews.tpgi.com.au>	<4baf6ec6$0$8756$c3e8da3@news.astraweb.com>
	<4bb1df60$1@dnews.tpgi.com.au>
Message-ID: <hosvbe$meu$1@dough.gmane.org>

Lie Ryan wrote:
> On 03/29/2010 01:59 AM, Steven D'Aprano wrote:
>> On Sun, 28 Mar 2010 06:48:21 +1100, Lie Ryan wrote:
>>
>>> On 03/22/2010 07:07 PM, Steven D'Aprano wrote:
>>>> Perhaps you should have said that it was a wrapper around deque giving
>>>> richer functionality, rather than giving the impression that it was a
>>>> brand new data structure invented by you. People are naturally going to
>>>> be more skeptical about a newly invented data structure than one based
>>>> on a reliable, component like deque.
>>> Well, technically StringChain is not a data structure in the first
>>> place. StringChain is a string;
>> And strings are data structures, as are arrays and structs. Just because 
>> they're simple data structures made directly from primitives rather than 
>> rich, complex structures, doesn't mean they're not data structures.
> 
> Array is a way to structure data and thus a data structure; array is the
> concept of structuring data using contiguous memory with elements
> addressed by an index. string is just a contiguous memory reserved to
> store data, or in other words: string is an array. This is what I meant
> when I said string is not itself a data structure.
> 
>>> a string that is implemented using deque
>>> data structure to make appending algorithmically efficient. It is not a
>>> data structure, in the sense that I can't put arbitrary "thing" into the
>>> data structure. 
>> Any "thing" that can be pickled or serialised can be put into a string.
> 
> Fair enough, you're right to think so but IMHO I disagree. Streams (or
> perhaps 'blob' to avoid the connotation of FIFO) are the data structure
> which you can put anything pickleable/serialisable into, but string (the
> implementation of stream/blob using array) are just a special case of
> array data structure and not a different, separate data structure than
> array.
> 
> Perhaps I should not make such a bold claim as saying string is not data
> structure; what I have in mind is that string is just a special case of
> array and not distinctly separate data structure than array.

While this may be true conceptually it's certainly not true in Python
(and in Python you need to be careful to distinguish between lists and
arrays, since it does have both types).

>From the point of view of the language, strings are primitives. But
every Python implementation uses a data structure to store them, and the
 structure is definitely not the same as is used to store lists, or
arrays (which in Python are container types, whereas the string isn't
because the individual indexable elements are immutable).

As always, it's better to seek common ground than pick the nits: I don't
think that there's really that much difference between your approach and
Steven's, but he's a well-known nit-picker (and we are *sometimes*
grateful for it).

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From mwilson at the-wire.com  Tue Mar 30 09:53:52 2010
From: mwilson at the-wire.com (Mel)
Date: Tue, 30 Mar 2010 09:53:52 -0400
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
	<4bb13580$0$8827$c3e8da3@news.astraweb.com>
	<31c7977e-9c8d-4be0-ae21-3c490e6364fe@z35g2000yqd.googlegroups.com>
	<pan.2010.03.30.03.29.11@REMOVE.THIS.cybersource.com.au>
	<559a2ee3-fb2c-477f-a444-7edbb6da8676@r1g2000yqj.googlegroups.com>
Message-ID: <hosvlq$do0$1@speranza.aioe.org>

Patrick Maupin wrote:

> Because sum() is the obvious way to sum floats; now the existence of
> math.fsum() means there are TWO obvious ways to sum floats.  Is that
> really that hard to understand?  How can you misconstrue this so badly
> that you write something that can be (easily) interpreted to mean that
> you think that I think that once math.fsum() exists, sum() doesn't
> even exist any more????

floats are nasty -- as evidence the recent thread on comparing floats for 
equality.  People use floats when they have to.  fsum exists because of 
this:

mwilson at tecumseth:~$ python
Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41) 
[GCC 4.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from math import fsum
>>> a=(1.0e200, 156.0, -1.0e200)
>>> sum(a)
0.0
>>> fsum(a)
156.0


You could generalize sum, but after that, there's a case that even fsum 
can't handle:


>>> ni=1.0e200+1.0j
>>> nj=1.0+1.0e200j
>>> ai=(ni, nj, 156.0+651.0j, -ni, -nj)
>>> sum(ai)
(-1+0j)
>>> fsum(ai)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: can't convert complex to float; use abs(z)
>>> 


	Mel.





From sccolbert at gmail.com  Tue Mar 30 10:25:54 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Tue, 30 Mar 2010 10:25:54 -0400
Subject: "Usability, the Soul of Python"
In-Reply-To: <2d56febf1003300511h617d7487t1bee6f69c6722a17@mail.gmail.com>
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
	<4bb14173$0$1640$742ec2ed@news.sonic.net>
	<mailman.1300.1269939807.23598.python-list@python.org>
	<hosnrh$6na$1@news.eternal-september.org>
	<2d56febf1003300511h617d7487t1bee6f69c6722a17@mail.gmail.com>
Message-ID: <7f014ea61003300725yf3dfcbdw2976160ca37f60f3@mail.gmail.com>

not really, the int will eventually overflow and cycle around ;)

On Tue, Mar 30, 2010 at 8:11 AM, Xavier Ho <contact at xavierho.com> wrote:

> Did no one notice that
>
>
> for(i = 99; i > 0; ++i)
>
> Gives you an infinite loop (sort of) because i starts a 99, and increases
> every loop?
>
> Cheers,
>
> Ching-Yun Xavier Ho, Technical Artist
>
> Contact Information
> Mobile: (+61) 04 3335 4748
> Skype ID: SpaXe85
> Email: contact at xavierho.com
> Website: http://xavierho.com/
>
>
>
> On Tue, Mar 30, 2010 at 9:40 PM, Alf P. Steinbach <alfps at start.no> wrote:
>
>> * Jean-Michel Pichavant:
>>
>>> John Nagle wrote:
>>>
>>>> Jonathan Hayward wrote:
>>>>
>>>>> I've posted "Usability, the Soul of Python: An Introduction to the
>>>>> Python Programming Language Through the Eyes of Usability", at:
>>>>>
>>>>>   http://JonathansCorner.com/python/
>>>>>
>>>>
>>>>   No, it's just a rather verbose introduction to Python, in dark brown
>>>> type on a light brown background.  One could write a good paper on this
>>>> topic, but this isn't it.
>>>>
>>>>
>>>>                John Nagle
>>>>
>>> Why is it bad ?
>>>
>>
>> Consider
>>
>>
>> <quote>
>> >From a usability standpoint, the braces go with the lines to print out
>> the stanza rather than the for statement or the code after, so the following
>> is best:
>>
>> for(i = 99; i > 0; ++i)
>>    {
>>    printf("%d slabs of spam in my mail!\n", i);
>>    printf("%d slabs of spam,\n", i);
>>    printf("Send one to abuse and Just Hit Delete,\n");
>>    printf("%d slabs of spam in my mail!\n\n", i + 1);
>>    }
>> </quote>
>>
>>
>> This is just unsubstantiated opinion, but worse, it makes a tacit
>> assumption that there is "best" way to do indentation. However, most
>> programmers fall into that trap, and I've done it myself. In fact, when I
>> worked as a consultant (then in Andersen Consulting, now Accenture) I used
>> the style above. Petter Hesselberg, author of "Industrial Strength Windows
>> Programming" (heh, I'm mentioned) asked my why on Earth I did that, like,
>> nobody does that? It was a habit I'd picked up in Pascal, from very na?ve
>> considerations of parse nesting levels, a kind of misguided idealism instead
>> of more practical pragmatism, but since I realized that that was an
>> incredibly weak argument I instead answered by pointing towards Charles
>> Petzold's code in his "Programming Windows" books. And amazingly I was
>> allowed to continue using this awkward and impractical style.
>>
>> I may or may not have been responsible for the similarly impractical
>> compromise convention of using three spaces per indentation level. At least,
>> in one big meeting the question about number of spaces was raised by the
>> speaker, and I replied from the benches, just in jest, "three!". And that
>> was it (perhaps).
>>
>>
>> Cheers,
>>
>> - Alf  (admitting to earlier mistakes)
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From bluemangroupie at gmail.com  Tue Mar 30 11:13:02 2010
From: bluemangroupie at gmail.com (aditya)
Date: Tue, 30 Mar 2010 08:13:02 -0700 (PDT)
Subject: Binary Decimals in Python
Message-ID: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>

To get the decimal representation of a binary number, I can just do
this:

int('11',2) # returns 3

But decimal binary numbers throw a ValueError:

int('1.1',2) # should return 1.5, throws error instead.

Is this by design? It seems to me that this is not the correct
behavior.

- Aditya


From anand.shashwat at gmail.com  Tue Mar 30 11:19:52 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Tue, 30 Mar 2010 20:49:52 +0530
Subject: Binary Decimals in Python
In-Reply-To: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
Message-ID: <d4ab53de1003300819l2892d134pe85244f19bd9959c@mail.gmail.com>

decimal binary number is not included AFAIK

On Tue, Mar 30, 2010 at 8:43 PM, aditya <bluemangroupie at gmail.com> wrote:

> To get the decimal representation of a binary number, I can just do
> this:
>
> int('11',2) # returns 3
>
> But decimal binary numbers throw a ValueError:
>
> int('1.1',2) # should return 1.5, throws error instead.
>
> Is this by design? It seems to me that this is not the correct
> behavior.
>
> - Aditya
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From pmaupin at gmail.com  Tue Mar 30 11:28:50 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Tue, 30 Mar 2010 08:28:50 -0700 (PDT)
Subject: Binary Decimals in Python
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
Message-ID: <4e7acb50-797f-4e19-a915-90724cf157fc@u22g2000yqf.googlegroups.com>

On Mar 30, 10:13?am, aditya <bluemangrou... at gmail.com> wrote:
> To get the decimal representation of a binary number, I can just do
> this:
>
> int('11',2) # returns 3
>
> But decimal binary numbers throw a ValueError:
>
> int('1.1',2) # should return 1.5, throws error instead.
>
> Is this by design? It seems to me that this is not the correct
> behavior.
>
> - Aditya

So, why should int('1.1', 2) throw an error when int('1.1') doesn't?

Regards,
Pat


From pmaupin at gmail.com  Tue Mar 30 11:31:25 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Tue, 30 Mar 2010 08:31:25 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au> 
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com> 
	<4bb13580$0$8827$c3e8da3@news.astraweb.com>
	<31c7977e-9c8d-4be0-ae21-3c490e6364fe@z35g2000yqd.googlegroups.com>
	<pan.2010.03.30.03.29.11@REMOVE.THIS.cybersource.com.au>
	<559a2ee3-fb2c-477f-a444-7edbb6da8676@r1g2000yqj.googlegroups.com>
	<hosvlq$do0$1@speranza.aioe.org>
Message-ID: <9437e04d-b7ba-489e-9737-89cd1af41b40@k19g2000yqn.googlegroups.com>

On Mar 30, 8:53?am, Mel <mwil... at the-wire.com> wrote:
> floats are nasty -- as evidence the recent thread on comparing floats for
> equality. ?People use floats when they have to. ?fsum exists because of
> this:

...

I understand there are technical reasons for why math.fsum() exists.
I still think that whatever math.fsum() does should probably be a part
of sum().

Regards,
Pat


From kgo at grant-olson.net  Tue Mar 30 11:35:21 2010
From: kgo at grant-olson.net (Grant Olson)
Date: Tue, 30 Mar 2010 11:35:21 -0400
Subject: Binary Decimals in Python
In-Reply-To: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
Message-ID: <4BB21A39.1070102@grant-olson.net>

On 3/30/2010 11:13 AM, aditya wrote:
> To get the decimal representation of a binary number, I can just do
> this:
> 
> int('11',2) # returns 3
> 
> But decimal binary numbers throw a ValueError:
> 
> int('1.1',2) # should return 1.5, throws error instead.
> 
> Is this by design? It seems to me that this is not the correct
> behavior.
> 

Well technically that would be a 'radix point', not a decimal point.

But I think the problem is that computers don't store fractional values
that way internally.  They either use floating or fixed point math.  You
would never look at raw binary data on a computer and see something like
'1010.1010', and no one would write it that way, and no language (that I
know of) would accept that as a valid value if you did something like "x
= 0b1010.1010"

So in that sense, it might not be an intentional oversight, but it's not
a very practical or useful feature.


From benjamin.kaplan at case.edu  Tue Mar 30 11:37:36 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Tue, 30 Mar 2010 11:37:36 -0400
Subject: Binary Decimals in Python
In-Reply-To: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
Message-ID: <ec96e1391003300837w115716bemad2844697bc48291@mail.gmail.com>

On Tue, Mar 30, 2010 at 11:13 AM, aditya <bluemangroupie at gmail.com> wrote:
> To get the decimal representation of a binary number, I can just do
> this:
>
> int('11',2) # returns 3
>
> But decimal binary numbers throw a ValueError:
>
> int('1.1',2) # should return 1.5, throws error instead.
>
> Is this by design? It seems to me that this is not the correct
> behavior.
>
> - Aditya
> --

Because int stands for integer and 1.1 is not an integer. You get the
same error if you try doing int('1.1')

> http://mail.python.org/mailman/listinfo/python-list
>


From tibor.beck at hotmail.com  Tue Mar 30 11:40:56 2010
From: tibor.beck at hotmail.com (gentlestone)
Date: Tue, 30 Mar 2010 08:40:56 -0700 (PDT)
Subject: (a==b) ? 'Yes' : 'No'
Message-ID: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>

Hi, how can I write the popular C/JAVA syntax in Python?

Java example:
    return (a==b) ? 'Yes' : 'No'

My first idea is:
    return ('No','Yes')[bool(a==b)]

Is there a more elegant/common python expression for this?



From anand.shashwat at gmail.com  Tue Mar 30 11:43:39 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Tue, 30 Mar 2010 21:13:39 +0530
Subject: Binary Decimals in Python
In-Reply-To: <4BB21A39.1070102@grant-olson.net>
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
	<4BB21A39.1070102@grant-olson.net>
Message-ID: <d4ab53de1003300843n7fccd004qc7cca0b8c4e15cf5@mail.gmail.com>

The conversion is not supported for decimal integers AFAIK, however
'0b123.456' is always valid. I guess you can always get a decimal number
convertor onto Python-recipes



On Tue, Mar 30, 2010 at 9:05 PM, Grant Olson <kgo at grant-olson.net> wrote:

> On 3/30/2010 11:13 AM, aditya wrote:
> > To get the decimal representation of a binary number, I can just do
> > this:
> >
> > int('11',2) # returns 3
> >
> > But decimal binary numbers throw a ValueError:
> >
> > int('1.1',2) # should return 1.5, throws error instead.
> >
> > Is this by design? It seems to me that this is not the correct
> > behavior.
> >
>
> Well technically that would be a 'radix point', not a decimal point.
>
> But I think the problem is that computers don't store fractional values
> that way internally.  They either use floating or fixed point math.  You
> would never look at raw binary data on a computer and see something like
> '1010.1010', and no one would write it that way, and no language (that I
> know of) would accept that as a valid value if you did something like "x
> = 0b1010.1010"
>
> So in that sense, it might not be an intentional oversight, but it's not
> a very practical or useful feature.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From mrmakent at cox.net  Tue Mar 30 11:44:23 2010
From: mrmakent at cox.net (Mike Kent)
Date: Tue, 30 Mar 2010 08:44:23 -0700 (PDT)
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
Message-ID: <034130b2-295b-4564-ac32-44de15d3f1c1@33g2000yqj.googlegroups.com>

On Mar 30, 11:40?am, gentlestone <tibor.b... at hotmail.com> wrote:
> Hi, how can I write the popular C/JAVA syntax in Python?
>
> Java example:
> ? ? return (a==b) ? 'Yes' : 'No'
>
> My first idea is:
> ? ? return ('No','Yes')[bool(a==b)]
>
> Is there a more elegant/common python expression for this?

return ('Yes' if a == b else 'No')


From python at rcn.com  Tue Mar 30 11:49:04 2010
From: python at rcn.com (Raymond Hettinger)
Date: Tue, 30 Mar 2010 08:49:04 -0700 (PDT)
Subject: Binary Decimals in Python
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
Message-ID: <24939652-22cb-47f1-97d5-3941463dd7b3@h27g2000yqm.googlegroups.com>

On Mar 30, 8:13?am, aditya <bluemangrou... at gmail.com> wrote:
> To get the decimal representation of a binary number, I can just do
> this:
>
> int('11',2) # returns 3
>
> But decimal binary numbers throw a ValueError:
>
> int('1.1',2) # should return 1.5, throws error instead.
>
> Is this by design? It seems to me that this is not the correct
> behavior.

The int() constructor returns integers.
So, look to float() for non-integral values.
Binary representation isn't supported yet,
but we do have hex:

    >>> float.fromhex('1.8')
    1.5


Raymond



From kgo at grant-olson.net  Tue Mar 30 11:51:49 2010
From: kgo at grant-olson.net (Grant Olson)
Date: Tue, 30 Mar 2010 11:51:49 -0400
Subject: Binary Decimals in Python
In-Reply-To: <d4ab53de1003300843n7fccd004qc7cca0b8c4e15cf5@mail.gmail.com>
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
	<4BB21A39.1070102@grant-olson.net>
	<d4ab53de1003300843n7fccd004qc7cca0b8c4e15cf5@mail.gmail.com>
Message-ID: <4BB21E15.60507@grant-olson.net>

Doh!

Well the problem is that int's are integers.  So yeah, you can't even do
that with normal value "int ('2.1')" will also throw an error.  And
floats don't support radix conversion, because no-one really writes
numbers that way.  (At least computer programmers...)


On 3/30/2010 11:43 AM, Shashwat Anand wrote:
> The conversion is not supported for decimal integers AFAIK, however
> '0b123.456' is always valid. I guess you can always get a decimal number
> convertor onto Python-recipes
> 
> 
> 
> On Tue, Mar 30, 2010 at 9:05 PM, Grant Olson <kgo at grant-olson.net
> <mailto:kgo at grant-olson.net>> wrote:
> 
>     On 3/30/2010 11:13 AM, aditya wrote:
>     > To get the decimal representation of a binary number, I can just do
>     > this:
>     >
>     > int('11',2) # returns 3
>     >
>     > But decimal binary numbers throw a ValueError:
>     >
>     > int('1.1',2) # should return 1.5, throws error instead.
>     >
>     > Is this by design? It seems to me that this is not the correct
>     > behavior.
>     >
> 
>     Well technically that would be a 'radix point', not a decimal point.
> 
>     But I think the problem is that computers don't store fractional values
>     that way internally.  They either use floating or fixed point math.  You
>     would never look at raw binary data on a computer and see something like
>     '1010.1010', and no one would write it that way, and no language (that I
>     know of) would accept that as a valid value if you did something like "x
>     = 0b1010.1010"
> 
>     So in that sense, it might not be an intentional oversight, but it's not
>     a very practical or useful feature.
>     --
>     http://mail.python.org/mailman/listinfo/python-list
> 
> 



From python at mrabarnett.plus.com  Tue Mar 30 11:54:08 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 30 Mar 2010 16:54:08 +0100
Subject: Binary Decimals in Python
In-Reply-To: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
Message-ID: <4BB21EA0.5060306@mrabarnett.plus.com>

aditya wrote:
> To get the decimal representation of a binary number, I can just do
> this:
> 
> int('11',2) # returns 3
> 
> But decimal binary numbers throw a ValueError:
> 
> int('1.1',2) # should return 1.5, throws error instead.
> 
> Is this by design? It seems to me that this is not the correct
> behavior.
> 
int() returns an integer (hence the name!), so it should never return a
float anyway.

What you want is for float() to accept a base, but that is rarely
needed.


From bluemangroupie at gmail.com  Tue Mar 30 11:54:43 2010
From: bluemangroupie at gmail.com (aditya)
Date: Tue, 30 Mar 2010 08:54:43 -0700 (PDT)
Subject: Binary Decimals in Python
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
	<mailman.1312.1269963469.23598.python-list@python.org>
Message-ID: <e378ec78-2de6-4d72-9f7c-13b93b88d69c@30g2000yqi.googlegroups.com>

On Mar 30, 10:37?am, Benjamin Kaplan <benjamin.kap... at case.edu> wrote:
> On Tue, Mar 30, 2010 at 11:13 AM, aditya <bluemangrou... at gmail.com> wrote:
> > To get the decimal representation of a binary number, I can just do
> > this:
>
> > int('11',2) # returns 3
>
> > But decimal binary numbers throw a ValueError:
>
> > int('1.1',2) # should return 1.5, throws error instead.
>
> > Is this by design? It seems to me that this is not the correct
> > behavior.
>
> > - Aditya
> > --
>
> Because int stands for integer and 1.1 is not an integer. You get the
> same error if you try doing int('1.1')
>
> >http://mail.python.org/mailman/listinfo/python-list
>
>

That makes sense. The closest thing I've found is this question on
StackOverflow: http://stackoverflow.com/questions/1592158/python-convert-hex-to-float

It seems to me that adding a conversion feature to floats would be a
lot more intuitive.


From mcfletch at vrplumber.com  Tue Mar 30 11:56:08 2010
From: mcfletch at vrplumber.com (Mike C. Fletcher)
Date: Tue, 30 Mar 2010 11:56:08 -0400
Subject: PyDispatcher on sourceforge doesn't play nice with easy_install
In-Reply-To: <4BB1B034.9020905@simplistix.co.uk>
References: <4BB1B034.9020905@simplistix.co.uk>
Message-ID: <4BB21F18.2010705@vrplumber.com>

Chris Withers wrote:
> Hi All,
>
> Using easy_install to get PyDispatcher results in:
>
...
> Who's the maintainer of PyDispatcher nowadays? Would be handy if they
> removed the sourceforge link from pypi.
...

Thanks for the report.  I've released a 2.0.2 version on PyPI.  That
should now work properly with easy_install.

HTH,
Mike

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com



From bluemangroupie at gmail.com  Tue Mar 30 11:56:26 2010
From: bluemangroupie at gmail.com (aditya)
Date: Tue, 30 Mar 2010 08:56:26 -0700 (PDT)
Subject: Binary Decimals in Python
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
	<24939652-22cb-47f1-97d5-3941463dd7b3@h27g2000yqm.googlegroups.com>
Message-ID: <1c1313db-16ac-4c40-bc89-2950cd9f5592@g10g2000yqh.googlegroups.com>

On Mar 30, 10:49?am, Raymond Hettinger <pyt... at rcn.com> wrote:
> On Mar 30, 8:13?am, aditya <bluemangrou... at gmail.com> wrote:
>
> > To get the decimal representation of a binary number, I can just do
> > this:
>
> > int('11',2) # returns 3
>
> > But decimal binary numbers throw a ValueError:
>
> > int('1.1',2) # should return 1.5, throws error instead.
>
> > Is this by design? It seems to me that this is not the correct
> > behavior.
>
> The int() constructor returns integers.
> So, look to float() for non-integral values.
> Binary representation isn't supported yet,
> but we do have hex:
>
> ? ? >>> float.fromhex('1.8')
> ? ? 1.5
>
> Raymond

That looks very elegant, thanks!


From clp2 at rebertia.com  Tue Mar 30 12:01:54 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 30 Mar 2010 09:01:54 -0700
Subject: (a==b) ? 'Yes' : 'No'
In-Reply-To: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
Message-ID: <50697b2c1003300901k157d10b0u7308b96a1f8be984@mail.gmail.com>

On Tue, Mar 30, 2010 at 8:40 AM, gentlestone <tibor.beck at hotmail.com> wrote:
> Hi, how can I write the popular C/JAVA syntax in Python?
>
> Java example:
> ? ?return (a==b) ? 'Yes' : 'No'
>
> My first idea is:
> ? ?return ('No','Yes')[bool(a==b)]
>
> Is there a more elegant/common python expression for this?

Yes, Python has ternary operator-like syntax:
return ('Yes' if a==b else 'No')

Note that this requires a recent version of Python.

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


From fetchinson at googlemail.com  Tue Mar 30 12:17:04 2010
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Tue, 30 Mar 2010 18:17:04 +0200
Subject: (a==b) ? 'Yes' : 'No'
In-Reply-To: <034130b2-295b-4564-ac32-44de15d3f1c1@33g2000yqj.googlegroups.com>
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<034130b2-295b-4564-ac32-44de15d3f1c1@33g2000yqj.googlegroups.com>
Message-ID: <fbe2e2101003300917md4336d2k9c3a1b15c55edeb3@mail.gmail.com>

>> Hi, how can I write the popular C/JAVA syntax in Python?
>>
>> Java example:
>>     return (a==b) ? 'Yes' : 'No'
>>
>> My first idea is:
>>     return ('No','Yes')[bool(a==b)]
>>
>> Is there a more elegant/common python expression for this?
>
> return ('Yes' if a == b else 'No')

And for less clutter you can even leave the parenthesis:

return 'Yes' if a == b else 'No'


-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From fordhaivat at gmail.com  Tue Mar 30 12:23:28 2010
From: fordhaivat at gmail.com (Someone Something)
Date: Tue, 30 Mar 2010 12:23:28 -0400
Subject: CPAN for python?
Message-ID: <e196a4051003300923q44fe1b81o43b43f6b3a3e120c@mail.gmail.com>

Hi,
I've learned python a few months ago but I still use Perl because of CPAN
and the tremendous amount of stuff that's already been done for you. is
there something like CPAN for python?
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From andrej.mitrovich at gmail.com  Tue Mar 30 12:34:18 2010
From: andrej.mitrovich at gmail.com (Andrej Mitrovic)
Date: Tue, 30 Mar 2010 09:34:18 -0700 (PDT)
Subject: Python Script Creator/Generator (function factory)
Message-ID: <d7d4a0e9-f55e-4678-bf59-b7bdd4063d18@z3g2000yqz.googlegroups.com>

Hello,

I have the following situation: I've got a 3rd party application that
has a Python API. The applicaiton has integrated support for MIDI
Hardware Controllers, which can be used to manipulate various
parameters of the application. The app can also load Python User
Scripts, which can define the mapping between the Controllers and
Parameters, but they can also be used to define the behavior of those
mappings as well.

I want to provide my users a GUI App that allows them to map their
MIDI Controllers to the application's Parameters, but with a specific
behavior. Once they've defined the mappings and behavior, my
application would generate a custom Python User Script, which then
gets loaded by the 3rd party app.

I've already got MIDI covered, and the GUI. Deployment via Pyinstaller
has been taken care of as well. My application can currently map
Controllers to Parameters in a 1:1 fashion, and can generate a simple
python User Script with all the mappings. What I'm left with
implementing is the behavior part.

Let me give you a simple example of a possible behavior that the user
could select:

- The user has a button on their MIDI Hardware (a simple type of MIDI
controller)
- The first time the button is hit, a specific parameter is selected
in the 3rd party application.
- The second time the button is hit, a different parameter is
selected.
- And so on, depending on the behavior of the function that's mapped
to that MIDI button

So, in essence, a simple User Script would look something like this
(pseudocode-ish):

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
swap_parameters()
    if button1 was_hit_the_first_time:
        select parameter1
    else:
        select parameter2

buttons = (
button1 = swap_parameters()
button3 = parameter3
button4 = parameter4
...
)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

What I had in mind, was to have a collection of behaviors stored in a
file (basically functions such as "swap_parameters") which the user
could select via my application, map them to a specific MIDI
Controller (such as a Button), and generate the User Script.

In essence, I'm trying to build a function factory that's specific to
the 3rd party application's provided API. But the user would have the
ability to change the way the function works. In the above example,
the user might want their MIDI Button to select parameter2 first, and
parameter1 the second time.

Has anyone had any experience with generating functionality this way,
and could you give me some pointers in the right direction? Any tips,
advice, book recommendations are more than welcome.


Kind regards,
Andrej Mitrovic


From andrej.mitrovich at gmail.com  Tue Mar 30 12:35:42 2010
From: andrej.mitrovich at gmail.com (Andrej Mitrovic)
Date: Tue, 30 Mar 2010 09:35:42 -0700 (PDT)
Subject: Python Script Creator/Generator (function factory)
References: <d7d4a0e9-f55e-4678-bf59-b7bdd4063d18@z3g2000yqz.googlegroups.com>
Message-ID: <e3e83b64-2e8b-4c01-9db2-7ecd3bd8fe8f@y17g2000yqd.googlegroups.com>

I forgot to mention, I'm using Python 2.5.x. I can't use Python 3
unfortunately, the 3rd party application uses Py2.5.x internally, so I
have to limit the functionality to that version.


From kushal.kumaran+python at gmail.com  Tue Mar 30 12:51:40 2010
From: kushal.kumaran+python at gmail.com (Kushal Kumaran)
Date: Tue, 30 Mar 2010 22:21:40 +0530
Subject: CPAN for python?
In-Reply-To: <e196a4051003300923q44fe1b81o43b43f6b3a3e120c@mail.gmail.com>
References: <e196a4051003300923q44fe1b81o43b43f6b3a3e120c@mail.gmail.com>
Message-ID: <1e364c4e1003300951w58515844n222e79df61b60779@mail.gmail.com>

On Tue, Mar 30, 2010 at 9:53 PM, Someone Something <fordhaivat at gmail.com> wrote:
> Hi,
> I've learned python a few months ago but I still use Perl because of CPAN
> and the tremendous amount of stuff that's already been done for you. is
> there something like CPAN for python?
>

Try PyPI. http://pypi.python.org/pypi

-- 
regards,
kushal


From gatoygata2 at gmail.com  Tue Mar 30 12:57:34 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Tue, 30 Mar 2010 09:57:34 -0700 (PDT)
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
Message-ID: <7316f3d2-bcc9-4a1a-8598-cdd5d41fd74b@k17g2000yqb.googlegroups.com>

On Mar 30, 5:40?pm, gentlestone <tibor.b... at hotmail.com> wrote:
> Hi, how can I write the popular C/JAVA syntax in Python?
>
> Java example:
> ? ? return (a==b) ? 'Yes' : 'No'
>
> My first idea is:
> ? ? return ('No','Yes')[bool(a==b)]
>
> Is there a more elegant/common python expression for this?

(a==b) and 'YES' or 'NO'

Yes, ugly

Joaquin


From robert.kern at gmail.com  Tue Mar 30 12:58:39 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 30 Mar 2010 11:58:39 -0500
Subject: (a==b) ? 'Yes' : 'No'
In-Reply-To: <4bb22b39$0$1638$742ec2ed@news.sonic.net>
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
Message-ID: <hotajv$6u1$1@dough.gmane.org>

On 2010-03-30 12:08 PM, John Nagle wrote:
> Chris Rebert wrote:
>> On Tue, Mar 30, 2010 at 8:40 AM, gentlestone <tibor.beck at hotmail.com>
>> wrote:
>>> Hi, how can I write the popular C/JAVA syntax in Python?
>>>
>>> Java example:
>>> return (a==b) ? 'Yes' : 'No'
>>>
>>> My first idea is:
>>> return ('No','Yes')[bool(a==b)]
>>>
>>> Is there a more elegant/common python expression for this?
>>
>> Yes, Python has ternary operator-like syntax:
>> return ('Yes' if a==b else 'No')
>>
>> Note that this requires a recent version of Python.
>
> Who let the dogs in? That's awful syntax.

http://www.python.org/dev/peps/pep-0308/

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From anand.shashwat at gmail.com  Tue Mar 30 13:03:51 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Tue, 30 Mar 2010 22:33:51 +0530
Subject: CPAN for python?
In-Reply-To: <1e364c4e1003300951w58515844n222e79df61b60779@mail.gmail.com>
References: <e196a4051003300923q44fe1b81o43b43f6b3a3e120c@mail.gmail.com> 
	<1e364c4e1003300951w58515844n222e79df61b60779@mail.gmail.com>
Message-ID: <d4ab53de1003301003y2716fd53t95fe024bd8035ff1@mail.gmail.com>

This has been discussed tons of times. You should have atleast googled it.
Python have nothing like CPAN and Cheese Shop (pypi) comes closest to it.

On Tue, Mar 30, 2010 at 10:21 PM, Kushal Kumaran <
kushal.kumaran+python at gmail.com <kushal.kumaran%2Bpython at gmail.com>> wrote:

> On Tue, Mar 30, 2010 at 9:53 PM, Someone Something <fordhaivat at gmail.com>
> wrote:
> > Hi,
> > I've learned python a few months ago but I still use Perl because of CPAN
> > and the tremendous amount of stuff that's already been done for you. is
> > there something like CPAN for python?
> >
>
> Try PyPI. http://pypi.python.org/pypi
>
> --
> regards,
> kushal
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From steve at REMOVE-THIS-cybersource.com.au  Tue Mar 30 13:05:14 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 30 Mar 2010 17:05:14 GMT
Subject: Binary Decimals in Python
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
	<4e7acb50-797f-4e19-a915-90724cf157fc@u22g2000yqf.googlegroups.com>
Message-ID: <4bb22f4a$0$8827$c3e8da3@news.astraweb.com>

On Tue, 30 Mar 2010 08:28:50 -0700, Patrick Maupin wrote:

> On Mar 30, 10:13?am, aditya <bluemangrou... at gmail.com> wrote:
>> To get the decimal representation of a binary number, I can just do
>> this:
>>
>> int('11',2) # returns 3
>>
>> But decimal binary numbers throw a ValueError:
>>
>> int('1.1',2) # should return 1.5, throws error instead.
>>
>> Is this by design? It seems to me that this is not the correct
>> behavior.
>>
>> - Aditya
> 
> So, why should int('1.1', 2) throw an error when int('1.1') doesn't?


>>> int('1.1')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: invalid literal for int() with base 10: '1.1'


int('1.1', 2) shouldn't return 1.5 because 1.5 isn't an integer.


The obvious question is, why doesn't float('1.1', 2) work? The answer is 
that Python doesn't support floats in any base except 10. It's not 
something needed very often, and it's harder to get right than it might 
seem.



-- 
Steven


From philip at semanchuk.com  Tue Mar 30 13:07:28 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 30 Mar 2010 13:07:28 -0400
Subject: CPAN for python?
In-Reply-To: <e196a4051003300923q44fe1b81o43b43f6b3a3e120c@mail.gmail.com>
References: <e196a4051003300923q44fe1b81o43b43f6b3a3e120c@mail.gmail.com>
Message-ID: <37A3074F-2980-4241-AC59-19E3252D9C6A@semanchuk.com>


On Mar 30, 2010, at 12:23 PM, Someone Something wrote:

> Hi,
> I've learned python a few months ago but I still use Perl because of  
> CPAN and the tremendous amount of stuff that's already been done for  
> you. is there something like CPAN for python?

Yes and no, depending on what CPAN means to you. This question come up  
often; have a look in the archives. Here's one thread on the topic  
from last month:

http://groups.google.com/group/comp.lang.python/browse_thread/thread/ecd51ced8d24593e/f773e080024862cb?lnk=gst&q=cpan#f773e080024862cb



From nagle at animats.com  Tue Mar 30 13:08:31 2010
From: nagle at animats.com (John Nagle)
Date: Tue, 30 Mar 2010 10:08:31 -0700
Subject: (a==b) ? 'Yes' : 'No'
In-Reply-To: <mailman.1317.1269964918.23598.python-list@python.org>
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
Message-ID: <4bb22b39$0$1638$742ec2ed@news.sonic.net>

Chris Rebert wrote:
> On Tue, Mar 30, 2010 at 8:40 AM, gentlestone <tibor.beck at hotmail.com> wrote:
>> Hi, how can I write the popular C/JAVA syntax in Python?
>>
>> Java example:
>>    return (a==b) ? 'Yes' : 'No'
>>
>> My first idea is:
>>    return ('No','Yes')[bool(a==b)]
>>
>> Is there a more elegant/common python expression for this?
> 
> Yes, Python has ternary operator-like syntax:
> return ('Yes' if a==b else 'No')
> 
> Note that this requires a recent version of Python.

     Who let the dogs in?  That's awful syntax.

					John Nagle


From steve at REMOVE-THIS-cybersource.com.au  Tue Mar 30 13:09:18 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 30 Mar 2010 17:09:18 GMT
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
Message-ID: <4bb2303e$0$8827$c3e8da3@news.astraweb.com>

On Tue, 30 Mar 2010 08:40:56 -0700, gentlestone wrote:

> Hi, how can I write the popular C/JAVA syntax in Python?
> 
> Java example:
>     return (a==b) ? 'Yes' : 'No'
> 
> My first idea is:
>     return ('No','Yes')[bool(a==b)]

You don't need the call to bool.

('No','Yes')[a==b]

 
> Is there a more elegant/common python expression for this?

The above is pretty elegant to my eyes, but you can also do:

return 'Yes' if a==b else 'No'



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Tue Mar 30 13:11:29 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 30 Mar 2010 17:11:29 GMT
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
Message-ID: <4bb230c1$0$8827$c3e8da3@news.astraweb.com>

On Tue, 30 Mar 2010 10:08:31 -0700, John Nagle wrote:

>> Yes, Python has ternary operator-like syntax: return ('Yes' if a==b
>> else 'No')
>> 
>> Note that this requires a recent version of Python.
> 
>      Who let the dogs in?  That's awful syntax.

I used to think so to, but now I like it. It matches common English 
syntax like:

"I'm going to the movies tonight, if I leave the office early, otherwise 
I'll stay home and nitpick on Usenet."



-- 
Steven


From sccolbert at gmail.com  Tue Mar 30 13:12:04 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Tue, 30 Mar 2010 13:12:04 -0400
Subject: (a==b) ? 'Yes' : 'No'
In-Reply-To: <4bb22b39$0$1638$742ec2ed@news.sonic.net>
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
Message-ID: <7f014ea61003301012u2b52cf7bi75298750989c46a7@mail.gmail.com>

On Tue, Mar 30, 2010 at 1:08 PM, John Nagle <nagle at animats.com> wrote:

> Chris Rebert wrote:
>
>> On Tue, Mar 30, 2010 at 8:40 AM, gentlestone <tibor.beck at hotmail.com>
>> wrote:
>>
>>> Hi, how can I write the popular C/JAVA syntax in Python?
>>>
>>> Java example:
>>>   return (a==b) ? 'Yes' : 'No'
>>>
>>> My first idea is:
>>>   return ('No','Yes')[bool(a==b)]
>>>
>>> Is there a more elegant/common python expression for this?
>>>
>>
>> Yes, Python has ternary operator-like syntax:
>> return ('Yes' if a==b else 'No')
>>
>> Note that this requires a recent version of Python.
>>
>
>    Who let the dogs in?  That's awful syntax.
>
>                                        John Nagle
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


I wouldn't say that. It reads exactly how one would say it. I prefer this
over the ? semantics. Whenever I see that, my mind goes "Does a equal b? If
so, return this, otherwise return that". "Return this if a equals b,
otherwise return that" is much more direct and declaritive IMHO.
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From howe.steven at gmail.com  Tue Mar 30 13:19:26 2010
From: howe.steven at gmail.com (Steven Howe)
Date: Tue, 30 Mar 2010 10:19:26 -0700
Subject: CPAN for python?
In-Reply-To: <e196a4051003300923q44fe1b81o43b43f6b3a3e120c@mail.gmail.com>
References: <e196a4051003300923q44fe1b81o43b43f6b3a3e120c@mail.gmail.com>
Message-ID: <4BB2329E.9050304@gmail.com>

This question comes up at least once a month, eliciting a thread that 
goes on for day.
Wouldn't it be wise to put a link on the bottom of the mail list? 
Something like

CPAN for Python == PyPi << make that an href

or

Python( CPAN ) = PyPi

Not too many characters.

sph


On 03/30/2010 09:23 AM, Someone Something wrote:
> Hi,
> I've learned python a few months ago but I still use Perl because of 
> CPAN and the tremendous amount of stuff that's already been done for 
> you. is there something like CPAN for python?

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From gatoygata2 at gmail.com  Tue Mar 30 13:50:15 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Tue, 30 Mar 2010 10:50:15 -0700 (PDT)
Subject: How many packages there are in PyPI
Message-ID: <084b6a4e-27e6-45e0-bebf-256b41598f20@z3g2000yqz.googlegroups.com>

Hi,
PyPI is reaching the 10000 package figure (In the case of 3.x only
about 140 packages and increasing very very slowly).

Looking at available packages for 3.x I observed that some packages
are listed several times. For example, lxml is listed 5 times.
Are these repetitions included in the package count? If yes, just out
of curiosity, somebody knows what the actual number of different
packages in the PyPI reservoir is?

Joaquin.


From steve at holdenweb.com  Tue Mar 30 13:56:04 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 30 Mar 2010 13:56:04 -0400
Subject: (a==b) ? 'Yes' : 'No'
In-Reply-To: <4bb22b39$0$1638$742ec2ed@news.sonic.net>
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
Message-ID: <hotdvr$kl3$1@dough.gmane.org>

John Nagle wrote:
> Chris Rebert wrote:
>> On Tue, Mar 30, 2010 at 8:40 AM, gentlestone <tibor.beck at hotmail.com>
>> wrote:
>>> Hi, how can I write the popular C/JAVA syntax in Python?
>>>
>>> Java example:
>>>    return (a==b) ? 'Yes' : 'No'
>>>
>>> My first idea is:
>>>    return ('No','Yes')[bool(a==b)]
>>>
>>> Is there a more elegant/common python expression for this?
>>
>> Yes, Python has ternary operator-like syntax:
>> return ('Yes' if a==b else 'No')
>>
>> Note that this requires a recent version of Python.
> 
>     Who let the dogs in?  That's awful syntax.
> 
Yes, that's deliberately awful syntax. Guido designed it that way to
ensure that people didn't aver-use it, thereby reducing the readability
of Python applications. Speaking purely personally I hardly ever use it,
but don't dislike it.


regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From mensanator at aol.com  Tue Mar 30 14:03:27 2010
From: mensanator at aol.com (Mensanator)
Date: Tue, 30 Mar 2010 11:03:27 -0700 (PDT)
Subject: Binary Decimals in Python
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
	<24939652-22cb-47f1-97d5-3941463dd7b3@h27g2000yqm.googlegroups.com>
Message-ID: <4eea3f36-10da-498a-890b-d879aac1fb86@y14g2000yqm.googlegroups.com>

On Mar 30, 10:49?am, Raymond Hettinger <pyt... at rcn.com> wrote:
> On Mar 30, 8:13?am, aditya <bluemangrou... at gmail.com> wrote:
>
> > To get the decimal representation of a binary number, I can just do
> > this:
>
> > int('11',2) # returns 3
>
> > But decimal binary numbers throw a ValueError:
>
> > int('1.1',2) # should return 1.5, throws error instead.
>
> > Is this by design? It seems to me that this is not the correct
> > behavior.
>
> The int() constructor returns integers.
> So, look to float() for non-integral values.
> Binary representation isn't supported yet,

It is supported in the gmpy module.

>>> import gmpy
>>> help(gmpy.mpf)
Help on built-in function mpf in module gmpy:

mpf(...)
    mpf(n): builds an mpf object with a numeric value n (n may be any
            Python number, or an mpz, mpq, or mpf object) and a
default
            precision (in bits) depending on the nature of n
    mpf(n,bits=0): as above, but with the specified number of bits (0
            means to use default precision, as above)
    mpf(s,bits=0,base=10): builds an mpf object from a string s made
up of
            digits in the given base, possibly with fraction-part
(with
            period as a separator) and/or exponent-part (with exponent
            marker 'e' for base<=10, else '@'). If base=256, s must be
            a gmpy.mpf portable binary representation as built by the
            function gmpy.fbinary (and the .binary method of mpf
objects).
            The resulting mpf object is built with a default precision
(in
            bits) if bits is 0 or absent, else with the specified
number
            of bits.

>>> gmpy.mpf('1.1',0,2)
mpf('1.5e0')


> but we do have hex:
>
> ? ? >>> float.fromhex('1.8')
> ? ? 1.5
>
> Raymond



From robert.kern at gmail.com  Tue Mar 30 14:05:13 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 30 Mar 2010 13:05:13 -0500
Subject: (a==b) ? 'Yes' : 'No'
In-Reply-To: <4bb230c1$0$8827$c3e8da3@news.astraweb.com>
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>	<mailman.1317.1269964918.23598.python-list@python.org>	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
	<4bb230c1$0$8827$c3e8da3@news.astraweb.com>
Message-ID: <hotegp$mit$1@dough.gmane.org>

On 2010-03-30 12:11 PM, Steven D'Aprano wrote:
> On Tue, 30 Mar 2010 10:08:31 -0700, John Nagle wrote:
>
>>> Yes, Python has ternary operator-like syntax: return ('Yes' if a==b
>>> else 'No')
>>>
>>> Note that this requires a recent version of Python.
>>
>>       Who let the dogs in?  That's awful syntax.
>
> I used to think so to, but now I like it. It matches common English
> syntax like:
>
> "I'm going to the movies tonight, if I leave the office early, otherwise
> I'll stay home and nitpick on Usenet."

I would suggest that this is much more common and less awkward English usage: 
"If I leave the office early, I'm going to the movies tonight; otherwise, I'll 
stay home and nitpick on Usenet."

I don't have a problem with the current syntax, and while its English analogue 
is grammatical, I don't think you can rightly call it idiomatic.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From invalid at invalid.invalid  Tue Mar 30 14:08:14 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Tue, 30 Mar 2010 18:08:14 +0000 (UTC)
Subject: Binary Decimals in Python
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
	<24939652-22cb-47f1-97d5-3941463dd7b3@h27g2000yqm.googlegroups.com>
	<1c1313db-16ac-4c40-bc89-2950cd9f5592@g10g2000yqh.googlegroups.com>
	<4bb23a99$0$1582$742ec2ed@news.sonic.net>
Message-ID: <hoteme$qao$1@reader1.panix.com>

On 2010-03-30, John Nagle <nagle at animats.com> wrote:

> Hex floats are useful because you can get a string representation of
> the exact value of a binary floating point number.  It should always
> be the case that
>
> 	 float.fromhex(float.hex(x)) == x

Until you try running your program on a machine that represents floats
using a radix other than 2,4, or 16.

;)

And it works for NaN and Inf too!

It would have been nice to have had that 5-6 years ago when I had to
write my own pickle/unpickle methods for floating point values so that
inf and nan were portable between Windows and Linux.

-- 
Grant Edwards               grant.b.edwards        Yow! But they went to MARS
                                  at               around 1953!!
                              gmail.com            


From nagle at animats.com  Tue Mar 30 14:14:07 2010
From: nagle at animats.com (John Nagle)
Date: Tue, 30 Mar 2010 11:14:07 -0700
Subject: Binary Decimals in Python
In-Reply-To: <1c1313db-16ac-4c40-bc89-2950cd9f5592@g10g2000yqh.googlegroups.com>
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
	<24939652-22cb-47f1-97d5-3941463dd7b3@h27g2000yqm.googlegroups.com>
	<1c1313db-16ac-4c40-bc89-2950cd9f5592@g10g2000yqh.googlegroups.com>
Message-ID: <4bb23a99$0$1582$742ec2ed@news.sonic.net>

aditya wrote:
> On Mar 30, 10:49 am, Raymond Hettinger <pyt... at rcn.com> wrote:
>> On Mar 30, 8:13 am, aditya <bluemangrou... at gmail.com> wrote:
>>
>>> To get the decimal representation of a binary number, I can just do
>>> this:
>>> int('11',2) # returns 3
>>> But decimal binary numbers throw a ValueError:
>>> int('1.1',2) # should return 1.5, throws error instead.
>>> Is this by design? It seems to me that this is not the correct
>>> behavior.
>> The int() constructor returns integers.
>> So, look to float() for non-integral values.
>> Binary representation isn't supported yet,
>> but we do have hex:
>>
>>     >>> float.fromhex('1.8')
>>     1.5
>>
>> Raymond
> 
> That looks very elegant, thanks!

    Hex floats are useful because you can get a string representation
of the exact value of a binary floating point number.  It should
always be the case that

	 float.fromhex(float.hex(x)) == x

That's not always true of decimal representations, due to rounding problems.

Long discussion of this here: "http://bugs.python.org/issue1580"


				John Nagle

	
	


From no.spam at local.local  Tue Mar 30 14:16:09 2010
From: no.spam at local.local (Robert Fendt)
Date: Tue, 30 Mar 2010 20:16:09 +0200
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
	<mailman.1326.1269971785.23598.python-list@python.org>
Message-ID: <20100330201609.6ef12ee1@vulcan.local>

And thus spake Steve Holden <steve at holdenweb.com>
Tue, 30 Mar 2010 13:56:04 -0400:

> >> Yes, Python has ternary operator-like syntax:
> >> return ('Yes' if a==b else 'No')
> >>
> >> Note that this requires a recent version of Python.
> > 
> >     Who let the dogs in?  That's awful syntax.
>
> Yes, that's deliberately awful syntax. Guido designed it that way to
> ensure that people didn't aver-use it, thereby reducing the readability
> of Python applications. Speaking purely personally I hardly ever use it,
> but don't dislike it.

In fact, the syntax just shouts 'do [...] unless' to me. And
that's so strong a Perl-ism I cannot quite express how ugly I
actually find it...

Regards,
Robert



From nagle at animats.com  Tue Mar 30 14:24:05 2010
From: nagle at animats.com (John Nagle)
Date: Tue, 30 Mar 2010 11:24:05 -0700
Subject: How many packages there are in PyPI
In-Reply-To: <084b6a4e-27e6-45e0-bebf-256b41598f20@z3g2000yqz.googlegroups.com>
References: <084b6a4e-27e6-45e0-bebf-256b41598f20@z3g2000yqz.googlegroups.com>
Message-ID: <4BB241C5.60501@animats.com>

Joaquin Abian wrote:
> Hi,
> PyPI is reaching the 10000 package figure (In the case of 3.x only
> about 140 packages and increasing very very slowly).
> 
> Looking at available packages for 3.x I observed that some packages
> are listed several times. For example, lxml is listed 5 times.
> Are these repetitions included in the package count? If yes, just out
> of curiosity, somebody knows what the actual number of different
> packages in the PyPI reservoir is?
> 
> Joaquin.

    There aren't that many packages "in" PyPI. It's more of a directory than
a repository.  And some of the links are dead.

    I just tried "Dejavu", which only has a link to "projects.amor.org". That
subdomain is dead.  "amor.org" is some kind of religious organization.

					John Nagle


From python at mrabarnett.plus.com  Tue Mar 30 14:52:36 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 30 Mar 2010 19:52:36 +0100
Subject: Binary Decimals in Python
In-Reply-To: <4bb23a99$0$1582$742ec2ed@news.sonic.net>
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>	<24939652-22cb-47f1-97d5-3941463dd7b3@h27g2000yqm.googlegroups.com>	<1c1313db-16ac-4c40-bc89-2950cd9f5592@g10g2000yqh.googlegroups.com>
	<4bb23a99$0$1582$742ec2ed@news.sonic.net>
Message-ID: <4BB24874.6020309@mrabarnett.plus.com>

John Nagle wrote:
> aditya wrote:
>> On Mar 30, 10:49 am, Raymond Hettinger <pyt... at rcn.com> wrote:
>>> On Mar 30, 8:13 am, aditya <bluemangrou... at gmail.com> wrote:
>>>
>>>> To get the decimal representation of a binary number, I can just do
>>>> this:
>>>> int('11',2) # returns 3
>>>> But decimal binary numbers throw a ValueError:
>>>> int('1.1',2) # should return 1.5, throws error instead.
>>>> Is this by design? It seems to me that this is not the correct
>>>> behavior.
>>> The int() constructor returns integers.
>>> So, look to float() for non-integral values.
>>> Binary representation isn't supported yet,
>>> but we do have hex:
>>>
>>>     >>> float.fromhex('1.8')
>>>     1.5
>>>
>>> Raymond
>>
>> That looks very elegant, thanks!
> 
>    Hex floats are useful because you can get a string representation
> of the exact value of a binary floating point number.  It should
> always be the case that
> 
>      float.fromhex(float.hex(x)) == x
> 
> That's not always true of decimal representations, due to rounding 
> problems.
> 
Floats have a limited length, unlike ints which are virtually unlimited.

> Long discussion of this here: "http://bugs.python.org/issue1580"
> 


From john at castleamber.com  Tue Mar 30 15:19:19 2010
From: john at castleamber.com (John Bokma)
Date: Tue, 30 Mar 2010 13:19:19 -0600
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
	<mailman.1326.1269971785.23598.python-list@python.org>
	<20100330201609.6ef12ee1@vulcan.local>
Message-ID: <87sk7h8vns.fsf@castleamber.com>

Robert Fendt <no.spam at local.local> writes:

> In fact, the syntax just shouts 'do [...] unless' to me. And
> that's so strong a Perl-ism I cannot quite express how ugly I
> actually find it...

And

 a == b and 'Yes' or 'No' 

isn't a Perl-ism?

Sheesh, this group would be so much nicer without the constant dragging
in of Perl to make a point. On top of that, do {  } unless blocks are
not idomatic in Perl. Perl Best Practices even clearly states to *never*
use unless.

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From quentel.pierre at wanadoo.fr  Tue Mar 30 15:38:08 2010
From: quentel.pierre at wanadoo.fr (Pierre Quentel)
Date: Tue, 30 Mar 2010 12:38:08 -0700 (PDT)
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net> 
	<mailman.1326.1269971785.23598.python-list@python.org>
	<20100330201609.6ef12ee1@vulcan.local> 
	<87sk7h8vns.fsf@castleamber.com>
Message-ID: <5ef544bb-95a0-4329-80ef-f679d62b8ead@z11g2000yqz.googlegroups.com>

On 30 mar, 21:19, John Bokma <j... at castleamber.com> wrote:
> Robert Fendt <no.s... at local.local> writes:
> > In fact, the syntax just shouts 'do [...] unless' to me. And
> > that's so strong a Perl-ism I cannot quite express how ugly I
> > actually find it...
>
> And
>
> ?a == b and 'Yes' or 'No'
>
> isn't a Perl-ism?
>
> Sheesh, this group would be so much nicer without the constant dragging
> in of Perl to make a point. On top of that, do { ?} unless blocks are
> not idomatic in Perl. Perl Best Practices even clearly states to *never*
> use unless.
>
> --
> John Bokma ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? j3b
>
> Hacking & Hiking in Mexico - ?http://johnbokma.com/http://castleamber.com/- Perl & Python Development

I'm surprised nobody proposed a solution with itertools ;-)

- Pierre


From russ.paielli at gmail.com  Tue Mar 30 16:03:37 2010
From: russ.paielli at gmail.com (Russ P.)
Date: Tue, 30 Mar 2010 13:03:37 -0700 (PDT)
Subject: "Usability, the Soul of Python"
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
	<4bb14173$0$1640$742ec2ed@news.sonic.net>
	<mailman.1300.1269939807.23598.python-list@python.org> 
	<hosnrh$6na$1@news.eternal-september.org>
Message-ID: <ef70b39d-a538-45d4-85bd-c8a424dc3f83@e7g2000yqf.googlegroups.com>

According to Wikipedia, this is called the Whitesmith style:

for(i = 99; i > 0; ++i)
     {
     printf("%d slabs of spam in my mail!\n", i);
     printf("%d slabs of spam,\n", i);
     printf("Send one to abuse and Just Hit Delete,\n");
     printf("%d slabs of spam in my mail!\n\n", i + 1);
     }

I agree with the Mr. Hayward that it is preferable to the more common
K&R style, because the braces do not violate and visually clutter the
logical indentation structure. It looks more like Python. The deeper
the level of nesting, the more this style reduces visual clutter
compared to the conventional style.

A slightly better style, in my opinion, is the Banner style:

for(i = 99; i > 0; ++i) {
     // a blank line here is optional
     printf("%d slabs of spam in my mail!\n", i);
     printf("%d slabs of spam,\n", i);
     printf("Send one to abuse and Just Hit Delete,\n");
     printf("%d slabs of spam in my mail!\n\n", i + 1);
     }


On Mar 30, 4:40?am, "Alf P. Steinbach" <al... at start.no> wrote:
> * Jean-Michel Pichavant:
>
> > John Nagle wrote:
> >> Jonathan Hayward wrote:
> >>> I've posted "Usability, the Soul of Python: An Introduction to the
> >>> Python Programming Language Through the Eyes of Usability", at:
>
> >>> ? ?http://JonathansCorner.com/python/
>
> >> ? ?No, it's just a rather verbose introduction to Python, in dark brown
> >> type on a light brown background. ?One could write a good paper on this
> >> topic, but this isn't it.
>
> >> ? ? ? ? ? ? ? ? John Nagle
> > Why is it bad ?
>
> Consider
>
> <quote>
> ?From a usability standpoint, the braces go with the lines to print out the
> stanza rather than the for statement or the code after, so the following is best:
>
> for(i = 99; i > 0; ++i)
> ? ? ?{
> ? ? ?printf("%d slabs of spam in my mail!\n", i);
> ? ? ?printf("%d slabs of spam,\n", i);
> ? ? ?printf("Send one to abuse and Just Hit Delete,\n");
> ? ? ?printf("%d slabs of spam in my mail!\n\n", i + 1);
> ? ? ?}
> </quote>
>
> This is just unsubstantiated opinion, but worse, it makes a tacit assumption
> that there is "best" way to do indentation. However, most programmers fall into
> that trap, and I've done it myself. In fact, when I worked as a consultant (then
> in Andersen Consulting, now Accenture) I used the style above. Petter
> Hesselberg, author of "Industrial Strength Windows Programming" (heh, I'm
> mentioned) asked my why on Earth I did that, like, nobody does that? It was a
> habit I'd picked up in Pascal, from very na?ve considerations of parse nesting
> levels, a kind of misguided idealism instead of more practical pragmatism, but
> since I realized that that was an incredibly weak argument I instead answered by
> pointing towards Charles Petzold's code in his "Programming Windows" books. And
> amazingly I was allowed to continue using this awkward and impractical style.
>
> I may or may not have been responsible for the similarly impractical compromise
> convention of using three spaces per indentation level. At least, in one big
> meeting the question about number of spaces was raised by the speaker, and I
> replied from the benches, just in jest, "three!". And that was it (perhaps).
>
> Cheers,
>
> - Alf ?(admitting to earlier mistakes)



From no.spam at local.local  Tue Mar 30 16:16:00 2010
From: no.spam at local.local (Robert Fendt)
Date: Tue, 30 Mar 2010 22:16:00 +0200
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
	<mailman.1326.1269971785.23598.python-list@python.org>
	<20100330201609.6ef12ee1@vulcan.local>
	<87sk7h8vns.fsf@castleamber.com>
Message-ID: <20100330221600.42cd3536@vulcan.local>

And thus spake John Bokma <john at castleamber.com>
Tue, 30 Mar 2010 13:19:19 -0600:

> And
> 
>  a == b and 'Yes' or 'No' 
> 
> isn't a Perl-ism?

I never said that this would be better. I don't even get the
point of what the advantage is supposed to be of inverting the
order of the return statement and the conditional check what
should actually _be_ returned. What's wrong with just writing

if a==b:
  return 'Yes'
else:
  return 'No'

apart from it being a few more line breaks and an additional
return statement? The inverted form is not more readable per
se (in fact, quite the opposite), and I would even suggest to
minimise its use even in languages like C++ and Java. The Python
syntax is even worse since it not only inverts the order of
return statement and conditional check, but it also puts the
conditional between the two results.

I find such a convoluted construct especially ugly in a language
which I previously regarded as having a rather striking beauty
of syntactical simplicity. The construct is superfluous,
illogical, unelegant, and thus very un-pythonesque, IMHO. But of
course that's just my $0.02.

> Sheesh, this group would be so much nicer without the constant dragging
> in of Perl to make a point. On top of that, do {  } unless blocks are
> not idomatic in Perl. Perl Best Practices even clearly states to *never*
> use unless.

Sorry, but you have just underlined my point, in fact. If it's
discouraged by experts, then of course the question must be
valid why such a feature even exists (okay, apart from 'it
seemed like a good idea at the time'). And more importantly (and
more on-topic here), why we have to have an analogon in Python.

Regards,
Robert



From ckaynor at zindagigames.com  Tue Mar 30 16:19:33 2010
From: ckaynor at zindagigames.com (Chris Kaynor)
Date: Tue, 30 Mar 2010 13:19:33 -0700
Subject: Binary Decimals in Python
In-Reply-To: <4bb23a99$0$1582$742ec2ed@news.sonic.net>
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
	<24939652-22cb-47f1-97d5-3941463dd7b3@h27g2000yqm.googlegroups.com>
	<1c1313db-16ac-4c40-bc89-2950cd9f5592@g10g2000yqh.googlegroups.com>
	<4bb23a99$0$1582$742ec2ed@news.sonic.net>
Message-ID: <a03c8d051003301319u5c14645eh7e403ece9b1a6b3a@mail.gmail.com>

Chris


On Tue, Mar 30, 2010 at 11:14 AM, John Nagle <nagle at animats.com> wrote:

> aditya wrote:
>
>> On Mar 30, 10:49 am, Raymond Hettinger <pyt... at rcn.com> wrote:
>>
>>> On Mar 30, 8:13 am, aditya <bluemangrou... at gmail.com> wrote:
>>>
>>>  To get the decimal representation of a binary number, I can just do
>>>> this:
>>>> int('11',2) # returns 3
>>>> But decimal binary numbers throw a ValueError:
>>>> int('1.1',2) # should return 1.5, throws error instead.
>>>> Is this by design? It seems to me that this is not the correct
>>>> behavior.
>>>>
>>> The int() constructor returns integers.
>>> So, look to float() for non-integral values.
>>> Binary representation isn't supported yet,
>>> but we do have hex:
>>>
>>>    >>> float.fromhex('1.8')
>>>    1.5
>>>
>>> Raymond
>>>
>>
>> That looks very elegant, thanks!
>>
>
>   Hex floats are useful because you can get a string representation
> of the exact value of a binary floating point number.  It should
> always be the case that
>
>         float.fromhex(float.hex(x)) == x
>
> That's not always true of decimal representations, due to rounding
> problems.
>

Actually, any number you can represent exactly in base 2 (or any power there
of) you can also represent exactly in decimal - its the other way around
thats a problem.


>
> Long discussion of this here: "http://bugs.python.org/issue1580"
>
>
>                                John Nagle
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From steve at holdenweb.com  Tue Mar 30 16:32:51 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 30 Mar 2010 16:32:51 -0400
Subject: (a==b) ? 'Yes' : 'No'
In-Reply-To: <20100330221600.42cd3536@vulcan.local>
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>	<mailman.1317.1269964918.23598.python-list@python.org>	<4bb22b39$0$1638$742ec2ed@news.sonic.net>	<mailman.1326.1269971785.23598.python-list@python.org>	<20100330201609.6ef12ee1@vulcan.local>	<87sk7h8vns.fsf@castleamber.com>
	<20100330221600.42cd3536@vulcan.local>
Message-ID: <hotn5l$pql$1@dough.gmane.org>

Robert Fendt wrote:
> And thus spake John Bokma <john at castleamber.com>
> Tue, 30 Mar 2010 13:19:19 -0600:
> 
>> And
>>
>>  a == b and 'Yes' or 'No' 
>>
>> isn't a Perl-ism?
> 
> I never said that this would be better. I don't even get the
> point of what the advantage is supposed to be of inverting the
> order of the return statement and the conditional check what
> should actually _be_ returned. What's wrong with just writing
> 
> if a==b:
>   return 'Yes'
> else:
>   return 'No'
> 
> apart from it being a few more line breaks and an additional
> return statement? The inverted form is not more readable per
> se (in fact, quite the opposite), and I would even suggest to
> minimise its use even in languages like C++ and Java. The Python
> syntax is even worse since it not only inverts the order of
> return statement and conditional check, but it also puts the
> conditional between the two results.
> 
> I find such a convoluted construct especially ugly in a language
> which I previously regarded as having a rather striking beauty
> of syntactical simplicity. The construct is superfluous,
> illogical, unelegant, and thus very un-pythonesque, IMHO. But of
> course that's just my $0.02.
> 
>> Sheesh, this group would be so much nicer without the constant dragging
>> in of Perl to make a point. On top of that, do {  } unless blocks are
>> not idomatic in Perl. Perl Best Practices even clearly states to *never*
>> use unless.
> 
> Sorry, but you have just underlined my point, in fact. If it's
> discouraged by experts, then of course the question must be
> valid why such a feature even exists (okay, apart from 'it
> seemed like a good idea at the time'). And more importantly (and
> more on-topic here), why we have to have an analogon in Python.

It exists because people nagged Guido mercilessly until, against his
better judgment, he capitulated.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From saimapk81 at gmail.com  Tue Mar 30 16:33:15 2010
From: saimapk81 at gmail.com (saima81)
Date: Tue, 30 Mar 2010 13:33:15 -0700 (PDT)
Subject: "jobs in kuwait" "jobs in kuwait for pakistanis" "jobs in kuwait 
	2010" "jobs in kuwait airways" "jobs in kuwait banks" "jobs in kuwait 
	telecom" "kuwait jobs" "kuwait airways" "kuwait jobs online" on   
	http://jobsinkuwait-net.blogspot.com/
Message-ID: <57003757-f992-4c10-82d5-1d91fe247d35@z35g2000yqd.googlegroups.com>

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From lxkain at gmail.com  Tue Mar 30 16:43:42 2010
From: lxkain at gmail.com (LX)
Date: Tue, 30 Mar 2010 13:43:42 -0700 (PDT)
Subject: decorators only when __debug__ == True
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>
	<mailman.1295.1269912866.23598.python-list@python.org>
Message-ID: <7778821c-84f3-4829-8e05-85134c5d6c5b@y17g2000yqd.googlegroups.com>

On Mar 29, 6:34?pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
> LX wrote:
> > Hi all, I have a question about decorators. I would like to use them
> > for argument checking, and pre/post conditions. However, I don't want
> > the additional overhead when I run in non-debug mode. I could do
> > something like this, using a simple trace example.
>
> > @decorator
> > def pass_decorator(f, *args, **kw): # what about the slow-down that
> > incurs when using pass_decorator?
> > ? ? return f(*args, **kw)
>
> > @decorator
> > def trace_decorator(f, *args, **kw):
> > ? ? print "calling %s with args %s, %s" % (f.func_name, args, kw)
> > ? ? return f(*args, **kw)
>
> > trace_enable_flag = False #__debug__
> > trace = trace_decorator if trace_enable_flag else pass_decorator
>
> > Trouble is, there is still an additional encapsulating function call.
> > Is there any way to eliminate the extra function call altogether?
> > Thanks in advance!
>
> I think you have misunderstood certain details about decorators.
>
> This code with a decorator:
>
> ? ? ?@decorator
> ? ? ?def hello():
> ? ? ? ? ?print "hello world"
>
> basically does this:
>
> ? ? ?def hello():
> ? ? ? ? ?print "hello world"
> ? ? ?hello = decorator(hello)
>
> so your non-decorator just needs to return the function it was passed:
>
> ? ? ?def pass_decorator(func):
> ? ? ? ? ?return func
>
> and your trace decorator would be something like this:
>
> ? ? ?def trace_decorator(func):
> ? ? ? ? ?def show(*args, **kwargs):
> ? ? ? ? ? ? ?print "calling %s with args %s, %s" % (func.func_name,
> args, kwargs)
> ? ? ? ? ? ? ?result = func(*args, **kwargs)
> ? ? ? ? ? ? ?print "returning %s from %s" % (result, func.func_name)
> ? ? ? ? ? ? ?return result
> ? ? ? ? ?return show

Sure, but during runtime, pass_decorator will still be called, even
though it doesn't do anything. I am wondering if I can disable this
additional function call at non-debug runtime. In other words, I want
the calling stack to contain no decorator at all, not even
pass_decorator.

I should mention that, in my code, the symbol "decorator" is imported
from Michele Simionato's decorator.py file.


From lxkain at gmail.com  Tue Mar 30 16:44:40 2010
From: lxkain at gmail.com (LX)
Date: Tue, 30 Mar 2010 13:44:40 -0700 (PDT)
Subject: decorators only when __debug__ == True
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>
	<pan.2010.03.30.02.11.09@REMOVE.THIS.cybersource.com.au>
Message-ID: <ac238901-6c37-48c3-8a22-57fe849ee828@e6g2000yqh.googlegroups.com>

On Mar 29, 7:11?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 29 Mar 2010 17:54:26 -0700, LX wrote:
> > Hi all, I have a question about decorators. I would like to use them for
> > argument checking, and pre/post conditions. However, I don't want the
> > additional overhead when I run in non-debug mode. I could do something
> > like this, using a simple trace example.
>
> def decorator(func):
> ? ? if __debug__:
> ? ? ? ? @functools.wraps(func)
> ? ? ? ? def inner(*args, **kwargs):
> ? ? ? ? ? ? preprocess()
> ? ? ? ? ? ? result = func(*args, **kwargs)
> ? ? ? ? ? ? postprocess()
> ? ? ? ? ? ? return result
> ? ? ? ? return inner
> ? ? else:
> ? ? ? ? return func
>
> --
> Steven

Actually, I am using "decorator" from Michele Simionato's decorator.py
file, at http://pypi.python.org/pypi/decorator.


From anton.shishkov at gmail.com  Tue Mar 30 16:47:42 2010
From: anton.shishkov at gmail.com (ASh)
Date: Tue, 30 Mar 2010 13:47:42 -0700 (PDT)
Subject: psycopg2 / psycopg2.DataError: invalid input syntax for type 
	timestamp with time zone:
Message-ID: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>

Hi, please help me understand why am I getting error with this query


            new_start_date = "NOW() - '29 days'::INTERVAL"
            self.dyndb.orderdb.query('''update xxxx set creation_date
= %s
            where id_order = %s''', (new_start_date, "123"))



...
psycopg2.DataError: invalid input syntax for type timestamp with time
zone: "NOW() - '29 days'::INTERVAL"




From news1234 at free.fr  Tue Mar 30 17:01:40 2010
From: news1234 at free.fr (News123)
Date: Tue, 30 Mar 2010 23:01:40 +0200
Subject: xpat error in xmlrp client. How to inspect data.
In-Reply-To: <mailman.1297.1269923825.23598.python-list@python.org>
References: <4bab1f4a$0$25677$426a74cc@news.free.fr>
	<mailman.1297.1269923825.23598.python-list@python.org>
Message-ID: <4bb266b5$0$21786$426a74cc@news.free.fr>

Hi Gabriel,

Gabriel Genellina wrote:
> En Thu, 25 Mar 2010 05:31:05 -0300, News123 <news1234 at free.fr> escribi?:
> 
>> I'm havign a small xmlrpc client, which works normally fine.
>> (xmlrpc via https)
>>
>> Sometimes however I receive an Exception about an expat error.
>>
>>
>> The output, that I receive is:
>>   File "C:\mycode\myrpcclient.py", line 63, in upload_chunk
>>     rslt = myrpcclient.call()
>>   File "C:\Python26\lib\xmlrpclib.py", line 1199, in __call__
>>     return self.__send(self.__name, args)
>>   File "C:\Python26\lib\xmlrpclib.py", line 1489, in __request
>>     verbose=self.__verbose
>>   File "C:\Python26\lib\xmlrpclib.py", line 1253, in request
>>     return self._parse_response(h.getfile(), sock)
>>   File "C:\Python26\lib\xmlrpclib.py", line 1387, in _parse_response
>>     p.feed(response)
>>   File "C:\Python26\lib\xmlrpclib.py", line 601, in feed
>>     self._parser.Parse(data, 0)
>> ExpatError: syntax error: line 1, column 0
>>
> 
> a) Use the standard cgitb module (despite its name, it is useful outside
> CGI scripts)
> 
> b) Use the tb module available from http://pypi.python.org/pypi/tb
> 
I'm currently using the default module traceback and code, which looks
roughly like:

try:
  xmlrpccall()
except Exception as e:
  ex_type,ex_value,e_b = sys.exc_info()
  tbstring = traceback.format_exc()
  logging.error('%s:%s:%s' % (ex_type,ex_value,tbstring)


do cgitb or tb really provide much more info?


> Both provide a more verbose traceback, including local variables at each
> execution frame.
> 
> c) Replace ("monkey-patch") the feed() method with a more debug-friendly
> version:
> 
> def feed(self, data):
>   try:
>     self._parser.Parse(data, 0)
>   except xmlrpclib.expat.ExpatError, e:
>     e.args += (data,)
>     raise
> 
> xmlrpclib.ExpatParser.feed = feed

Well, the monkey patch seems to be THE solution for my problem. Thanks a
lot.
Now I'll just have to wait till the problem shows up again.
Probably I'll just display the backtrace in the except section.

> 
> (Or perhaps set e.data = data)
> 
> d) In your exception handler, walk the traceback object until you reach
> the feed() call, and inspect the corresponding tb_frame.f_locals
> dictionary.

How can I walk a traceback? For the current problem the the monkeypatch
should be good enough, but for other cases it might be good to know.



bye

N


From mensanator at aol.com  Tue Mar 30 17:05:44 2010
From: mensanator at aol.com (Mensanator)
Date: Tue, 30 Mar 2010 14:05:44 -0700 (PDT)
Subject: Binary Decimals in Python
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
	<24939652-22cb-47f1-97d5-3941463dd7b3@h27g2000yqm.googlegroups.com> 
	<1c1313db-16ac-4c40-bc89-2950cd9f5592@g10g2000yqh.googlegroups.com> 
	<4bb23a99$0$1582$742ec2ed@news.sonic.net>
	<mailman.1328.1269975152.23598.python-list@python.org>
Message-ID: <951faaf2-affd-474c-811b-157579b2897c@g10g2000yqh.googlegroups.com>

On Mar 30, 1:52?pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
> John Nagle wrote:
> > aditya wrote:
> >> On Mar 30, 10:49 am, Raymond Hettinger <pyt... at rcn.com> wrote:
> >>> On Mar 30, 8:13 am, aditya <bluemangrou... at gmail.com> wrote:
>
> >>>> To get the decimal representation of a binary number, I can just do
> >>>> this:
> >>>> int('11',2) # returns 3
> >>>> But decimal binary numbers throw a ValueError:
> >>>> int('1.1',2) # should return 1.5, throws error instead.
> >>>> Is this by design? It seems to me that this is not the correct
> >>>> behavior.
> >>> The int() constructor returns integers.
> >>> So, look to float() for non-integral values.
> >>> Binary representation isn't supported yet,
> >>> but we do have hex:
>
> >>> ? ? >>> float.fromhex('1.8')
> >>> ? ? 1.5
>
> >>> Raymond
>
> >> That looks very elegant, thanks!
>
> > ? ?Hex floats are useful because you can get a string representation
> > of the exact value of a binary floating point number. ?It should
> > always be the case that
>
> > ? ? ?float.fromhex(float.hex(x)) == x
>
> > That's not always true of decimal representations, due to rounding
> > problems.
>
> Floats have a limited length, unlike ints which are virtually unlimited.

gmpy gives you arbitrary precision floats, also.

>
>
>
> > Long discussion of this here: "http://bugs.python.org/issue1580"- Hide quoted text -
>
> - Show quoted text -- Hide quoted text -
>
> - Show quoted text -



From philip at semanchuk.com  Tue Mar 30 17:26:51 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 30 Mar 2010 17:26:51 -0400
Subject: psycopg2 / psycopg2.DataError: invalid input syntax for type
	timestamp with time zone:
In-Reply-To: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>
References: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>
Message-ID: <5171EFC3-09A0-4937-BDAD-C179CF1E1DFE@semanchuk.com>


On Mar 30, 2010, at 4:47 PM, ASh wrote:

> Hi, please help me understand why am I getting error with this query
>
>
>            new_start_date = "NOW() - '29 days'::INTERVAL"
>            self.dyndb.orderdb.query('''update xxxx set creation_date
> = %s
>            where id_order = %s''', (new_start_date, "123"))
>
>
>
> ...
> psycopg2.DataError: invalid input syntax for type timestamp with time
> zone: "NOW() - '29 days'::INTERVAL"

Hi Anton,
It sounds to me like the problem is with your SQL rather than with  
psycopg2 or Python. Try the query directly in Postgres -- does it work  
there? If so, then your next step should be to ask on the psycopg2  
mailing list that Google can find for you.

Good luck
Philip



From hp6 at rice.edu  Tue Mar 30 17:31:58 2010
From: hp6 at rice.edu (Justin Park)
Date: Tue, 30 Mar 2010 16:31:58 -0500
Subject: A question about making a sort-of-counter. 
Message-ID: <4BB26DCE.7070307@rice.edu>

Suppose I have a list.
a = list()
And suppose allowed digits as the element are 1,2,3,4,5.

What can I do in order to iterate over all possible values for each element?
For instance, the sequence of the list I want to have would be
[1,1,1,1,1]
[1,1,1,1,2]
[1,1,1,1,3]

....

[5,5,5,5,4]
[5,5,5,5,5]

How can I make it happen?

Thanks,
Justin.


From python at mrabarnett.plus.com  Tue Mar 30 17:41:31 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 30 Mar 2010 22:41:31 +0100
Subject: decorators only when __debug__ == True
In-Reply-To: <7778821c-84f3-4829-8e05-85134c5d6c5b@y17g2000yqd.googlegroups.com>
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>	<mailman.1295.1269912866.23598.python-list@python.org>
	<7778821c-84f3-4829-8e05-85134c5d6c5b@y17g2000yqd.googlegroups.com>
Message-ID: <4BB2700B.90200@mrabarnett.plus.com>

LX wrote:
> On Mar 29, 6:34 pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
>> LX wrote:
>>> Hi all, I have a question about decorators. I would like to use them
>>> for argument checking, and pre/post conditions. However, I don't want
>>> the additional overhead when I run in non-debug mode. I could do
>>> something like this, using a simple trace example.
>>> @decorator
>>> def pass_decorator(f, *args, **kw): # what about the slow-down that
>>> incurs when using pass_decorator?
>>>     return f(*args, **kw)
>>> @decorator
>>> def trace_decorator(f, *args, **kw):
>>>     print "calling %s with args %s, %s" % (f.func_name, args, kw)
>>>     return f(*args, **kw)
>>> trace_enable_flag = False #__debug__
>>> trace = trace_decorator if trace_enable_flag else pass_decorator
>>> Trouble is, there is still an additional encapsulating function call.
>>> Is there any way to eliminate the extra function call altogether?
>>> Thanks in advance!
>> I think you have misunderstood certain details about decorators.
>>
>> This code with a decorator:
>>
>>      @decorator
>>      def hello():
>>          print "hello world"
>>
>> basically does this:
>>
>>      def hello():
>>          print "hello world"
>>      hello = decorator(hello)
>>
>> so your non-decorator just needs to return the function it was passed:
>>
>>      def pass_decorator(func):
>>          return func
>>
>> and your trace decorator would be something like this:
>>
>>      def trace_decorator(func):
>>          def show(*args, **kwargs):
>>              print "calling %s with args %s, %s" % (func.func_name,
>> args, kwargs)
>>              result = func(*args, **kwargs)
>>              print "returning %s from %s" % (result, func.func_name)
>>              return result
>>          return show
> 
> Sure, but during runtime, pass_decorator will still be called, even
> though it doesn't do anything. I am wondering if I can disable this
> additional function call at non-debug runtime. In other words, I want
> the calling stack to contain no decorator at all, not even
> pass_decorator.
> 
> I should mention that, in my code, the symbol "decorator" is imported
> from Michele Simionato's decorator.py file.

pass_decorator will be called when the decorated function is _defined_,
but not when the decorated function is _called_.


From python at mrabarnett.plus.com  Tue Mar 30 17:43:04 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 30 Mar 2010 22:43:04 +0100
Subject: (a==b) ? 'Yes' : 'No'
In-Reply-To: <20100330221600.42cd3536@vulcan.local>
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>	<mailman.1317.1269964918.23598.python-list@python.org>	<4bb22b39$0$1638$742ec2ed@news.sonic.net>	<mailman.1326.1269971785.23598.python-list@python.org>	<20100330201609.6ef12ee1@vulcan.local>	<87sk7h8vns.fsf@castleamber.com>
	<20100330221600.42cd3536@vulcan.local>
Message-ID: <4BB27068.9020009@mrabarnett.plus.com>

Robert Fendt wrote:
> And thus spake John Bokma <john at castleamber.com>
> Tue, 30 Mar 2010 13:19:19 -0600:
> 
>> And
>>
>>  a == b and 'Yes' or 'No' 
>>
>> isn't a Perl-ism?
> 
> I never said that this would be better. I don't even get the
> point of what the advantage is supposed to be of inverting the
> order of the return statement and the conditional check what
> should actually _be_ returned. What's wrong with just writing
> 
> if a==b:
>   return 'Yes'
> else:
>   return 'No'
> 
> apart from it being a few more line breaks and an additional
> return statement? The inverted form is not more readable per
> se (in fact, quite the opposite), and I would even suggest to
> minimise its use even in languages like C++ and Java. The Python
> syntax is even worse since it not only inverts the order of
> return statement and conditional check, but it also puts the
> conditional between the two results.
> 
> I find such a convoluted construct especially ugly in a language
> which I previously regarded as having a rather striking beauty
> of syntactical simplicity. The construct is superfluous,
> illogical, unelegant, and thus very un-pythonesque, IMHO. But of
> course that's just my $0.02.
> 
I think you mean that it's very _un-Pythonic_ (perhaps because it's very
very Pythonesque)! :-)

>> Sheesh, this group would be so much nicer without the constant dragging
>> in of Perl to make a point. On top of that, do {  } unless blocks are
>> not idomatic in Perl. Perl Best Practices even clearly states to *never*
>> use unless.
> 
> Sorry, but you have just underlined my point, in fact. If it's
> discouraged by experts, then of course the question must be
> valid why such a feature even exists (okay, apart from 'it
> seemed like a good idea at the time'). And more importantly (and
> more on-topic here), why we have to have an analogon in Python.
> 



From no.spam at local.local  Tue Mar 30 17:47:27 2010
From: no.spam at local.local (Robert Fendt)
Date: Tue, 30 Mar 2010 23:47:27 +0200
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
	<mailman.1326.1269971785.23598.python-list@python.org>
	<20100330201609.6ef12ee1@vulcan.local>
	<87sk7h8vns.fsf@castleamber.com>
	<20100330221600.42cd3536@vulcan.local>
	<mailman.1334.1269985381.23598.python-list@python.org>
Message-ID: <20100330234727.25bcbda8@vulcan.local>

And thus spake MRAB <python at mrabarnett.plus.com>
Tue, 30 Mar 2010 22:43:04 +0100:

> I think you mean that it's very _un-Pythonic_ (perhaps because it's very
> very Pythonesque)! :-)

Yes. Of course. What was I thinking. ;-)

Regards,
Robert



From mail at hellmutweber.de  Tue Mar 30 17:49:24 2010
From: mail at hellmutweber.de (Hellmut Weber)
Date: Tue, 30 Mar 2010 23:49:24 +0200
Subject: logging: local functions ==> loss of lineno
In-Reply-To: <b02720d8-a1b5-4133-a018-b3dd613be8e3@q21g2000yqm.googlegroups.com>
References: <mailman.576.1268256192.23598.python-list@python.org>
	<hnaj9c$i0u$02$1@news.t-online.com>
	<4BA295A1.70207@hellmutweber.de>
	<mailman.972.1268995215.23598.python-list@python.org>	<hnvqe5$vc$02$1@news.t-online.com>
	<mailman.977.1269006574.23598.python-list@python.org>	<ho21dt$b6v$00$1@news.t-online.com>
	<d35c950b-c6e5-4162-8175-3e0a0255c71a@30g2000yqi.googlegroups.com>
	<hocmak$ap$00$1@news.t-online.com>
	<b02720d8-a1b5-4133-a018-b3dd613be8e3@q21g2000yqm.googlegroups.com>
Message-ID: <4BB271E4.4000505@hellmutweber.de>

Hi Peter and Jean-Michel,
thanks for all your hints and pieces of code.

It took me a while to play around with what I got from you (and some 
study of Vinay's module documentation.

Now I have come up with a more complete solution I'm quite satisfied 
with. And I would be very glad to receive your comments on my code 
indicating what I could do better, given that I'm still at the very 
beginning with python.


Cheers + TIA

Hellmut


Here is my module and a corresponding test program:

leo at sylvester hw_logg $ cat loc_logg.py 

#!/bin/env python 

# -*- coding: utf-8 -*- 

"""Hw's local logging module 


To be done:
   Factorize 'trace' decorator to own module
     (to permit dependency on debug level) ???
"""

import sys # Basic system functions

import logging # Logging base
import logging.handlers

import inspect # monkey patch caller filename

# --- color change strings for terminal output ---
#
pc_yell = '\033[01;93m'
pc_purp = '\033[01;33m'
pc_gren = '\033[01;92m'
pc_blue = '\033[01;94m'
#
pc_bold = '\033[01;1m'
pc_norm = '\033[0m'
#
pc_reed = '\033[01;91m'
pc_cyan = '\033[01;96m'

level_color = {
   'fatal': pc_yell,
   'error': pc_yell,
   'warning': pc_purp,
   'info': pc_gren,
   'debug': pc_blue,
   'bold': pc_bold,
   'normal': pc_norm
   }

# --- define string building help function ---
#
def argskw_2_string(*args, **kwargs):
   """Generate String from *args and **kwargs

   Return string with
     *args list (comma separated) in first line
     **kwargs key=val list (comma separated) in second line
   """
   _str_lines = []

   if args:
     _args_strings = ''
     for a in args:
       _args_strings += str(a) + ', '
     _str_lines.append(_args_strings)

   if kwargs:
     _kwargs_strings = ''
     for k in kwargs:
       _kwargs_strings += str(k)+' = '+str(kwargs[k]) + ', '
     _str_lines.append(_kwargs_strings)
   return ''.join(_str_lines)


# --- Class for all logging functionality ---
#
class locLogg():
   _logger = None

   def __init__(self, newlogg=None):
     if not locLogg._logger:
       locLogg._logger = newlogg

   def init_logging(self,
     loclogg_output='line', # stream or/and file
     loclogg_fname='loggfile.txt',
     loclogg_dblevel='DEBUG'
     ):
     """Initiate logging with locLogg._logger

     Defines the logging handler to be used
     and initiates it.

     Possible values for loclogg_output:
       line ==> output to console
       file ==> log_file must be given
       both ==> log_file must be given
       null ==> no logging (NullHandler)
     """
     locLogg._logger.handlers=[]
     if loclogg_output in ('null'):
       class NullHandler(logging.Handler):
         def emit(self, record):
           pass
       locLogg._logger.addHandler(NullHandler())
     if loclogg_output in ('line', 'both'):
       locLogg._logger.addHandler(logging.StreamHandler())
     if loclogg_output in ('file', 'both'):
       locLogg._logger.addHandler(
           logging.handlers.RotatingFileHandler(loclogg_fname,
                maxBytes=200000, backupCount=5)
           )
     for _loc_logger in locLogg._logger.handlers:
       _loc_logger.setFormatter(logging.Formatter(
           '%(asctime)s ' + \
           '%(custom_filename)s <%(custom_lineno)d>:' + \
           '%(levelname)s %(message)s'))
     # Can this be done better ?
     _loc_levels = {'NOTSET': 0, 'DEBUG': 10,
         'INFO': 20, 'WARNING': 30, 'ERROR': 40, 'CRITICAL': 50}
     locLogg._logger.setLevel(_loc_levels[loclogg_dblevel])

   def info_log(self, msg, *args, **kwargs):
     previousFrame = inspect.currentframe().f_back
     locLogg._logger.info(str(level_color['info'])+msg+pc_norm + \
       ' ' + argskw_2_string(*args, **kwargs),
       extra={'custom_lineno': previousFrame.f_lineno,
         'custom_filename': previousFrame.f_code.co_filename })

   def debug_log(self, msg, *args, **kwargs):
     previousFrame = inspect.currentframe().f_back
     locLogg._logger.debug(str(level_color['debug'])+msg+pc_norm + \
       ' ' + argskw_2_string(*args, **kwargs),
       extra={'custom_lineno':previousFrame.f_lineno,
         'custom_filename': previousFrame.f_code.co_filename })

   def warn_log(self, msg, *args, **kwargs):
     previousFrame = inspect.currentframe().f_back
     locLogg._logger.debug(str(level_color['warning'])+msg+pc_norm + \
       ' ' + argskw_2_string(*args, **kwargs),
       extra={'custom_lineno':previousFrame.f_lineno,
         'custom_filename': previousFrame.f_code.co_filename })

   def error_log(self, msg, *args, **kwargs):
     previousFrame = inspect.currentframe().f_back
     locLogg._logger.error(str(level_color['error'])+msg+pc_norm + \
       ' ' + argskw_2_string(*args, **kwargs),
       extra={'custom_lineno':previousFrame.f_lineno,
         'custom_filename': previousFrame.f_code.co_filename })

   def fatal_log(self, msg, *args, **kwargs):
     previousFrame = inspect.currentframe().f_back
     locLogg._logger.fatal(str(level_color['fatal'])+msg+pc_norm + \
       ' ' + argskw_2_string(*args, **kwargs),
       extra={'custom_lineno':previousFrame.f_lineno,
         'custom_filename': previousFrame.f_code.co_filename })

# --- Permit definition of a tracing decorator ---
from decorator import decorator

@decorator
def trace(f, *args, **kw):
   print "@trace: calling %s with args %s, %s" % (f.func_name, args, kw)
   return f(*args, **kw)
# cf. doc of Michele Simoniato's decorator module


if __name__ == '__main__':

   _logger = logging.getLogger('jmp_logg__main__')
   foo = locLogg(_logger)
   foo.init_logging()

   foo.info_log('a foo info')
   foo.info_log('another bar info', 1,2,3, a=11, b=22, c=44)
   foo.debug_log('a debug bar info', 'a', '1aA', qwe=2, asd=99)
   foo.warn_log('a test info', 'ggg', '2U2', yxcv=2, asdf=99)

   try:
     b = 123
     c = 0
     a = b / c
   except:
     foo.fatal_log('Division by zero', b=123, c=0)

leo at sylvester hw_logg $ cat test_loclogg.py
#!/bin/env python
# -*- coding: utf-8 -*-

import logging
_logger = logging.getLogger()

import sys
pyDevelDir = '/home/leo/leo/brbeit/py-devel/Modules'
sys.path.append(pyDevelDir)

from hw_logg.loc_logg import locLogg
foo = locLogg(_logger)
foo.init_logging(
     loclogg_output='both',
     loclogg_dblevel='DEBUG')

import loc_module as jm

foo.info_log('First info with args in string: %d %d %d' % (1,2,3))
foo.warn_log('First warning')
foo.debug_log('First debug message TestTestTest', '----------', 4,5,6, 
12*25, d=34, e='qwe')

foo.debug_log('Before calling jm.doIt()')
jm.doIt(True)

foo.info_log('Second info with kwargs separate:', a=11,b=22,c=33)

x = jm.MyClass(1, 2, 'abc')
x.mymethod()
x.mymethod(123, 234, a=1, b=2, c=3)

try:
   jm.doIt(0)
except Exception, e:
   foo.error_log(str(e), 1,5,8)
   foo.fatal_log('Fatal message')

leo at sylvester hw_logg $ cat loc_module.py
# -*- coding: utf-8 -*-

import logging
_logger = logging.getLogger('jmp_logger')

import sys
pyDevelDir = '/home/leo/leo/brbeit/py-devel/Modules'
sys.path.append(pyDevelDir)

from hw_logg.loc_logg import locLogg, trace
foo = locLogg(_logger)

foo.info_log("Start importing "+__name__)

def doIt(yn=None):
     foo.debug_log("doin' stuff, yn =", str(yn)) # logLevel at calling 
point !
     print '=====> Output from doIt:', yn
     #do stuff...but suppose an error occurs?
     if yn:
       foo.info_log('yn: good value')
     else:
       raise TypeError, "bogus type error for testing"

class MyClass(object):
   @trace
   def __init__(self, *args, **kwargs):
     print 'MyClass.__init__'
   @trace
   def mymethod(self, *args, **kwargs):
     print 'MyClass.mymethod'

foo.info_log("End   importing "+__name__)

-- 
Dr. Hellmut Weber         mail at hellmutweber.de
Degenfeldstra?e 2         tel   +49-89-3081172
D-80803 M?nchen-Schwabing mobil +49-172-8450321
please: No DOCs, no PPTs. why: tinyurl.com/cbgq



From darcy at druid.net  Tue Mar 30 17:50:56 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Tue, 30 Mar 2010 17:50:56 -0400
Subject: psycopg2 / psycopg2.DataError: invalid input syntax for type 
	timestamp with time zone:
In-Reply-To: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>
References: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>
Message-ID: <20100330175056.ca69563c.darcy@druid.net>

On Tue, 30 Mar 2010 13:47:42 -0700 (PDT)
ASh <anton.shishkov at gmail.com> wrote:
> Hi, please help me understand why am I getting error with this query
> 
> 
>             new_start_date = "NOW() - '29 days'::INTERVAL"
>             self.dyndb.orderdb.query('''update xxxx set creation_date
> = %s
>             where id_order = %s''', (new_start_date, "123"))

Put single quotes around the first %s in the query.

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


From robert.kern at gmail.com  Tue Mar 30 17:58:34 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 30 Mar 2010 16:58:34 -0500
Subject: A question about making a sort-of-counter.
In-Reply-To: <4BB26DCE.7070307@rice.edu>
References: <4BB26DCE.7070307@rice.edu>
Message-ID: <hots6b$egm$1@dough.gmane.org>

On 2010-03-30 16:31 PM, Justin Park wrote:
> Suppose I have a list.
> a = list()
> And suppose allowed digits as the element are 1,2,3,4,5.
>
> What can I do in order to iterate over all possible values for each element?
> For instance, the sequence of the list I want to have would be
> [1,1,1,1,1]
> [1,1,1,1,2]
> [1,1,1,1,3]
>
> ....
>
> [5,5,5,5,4]
> [5,5,5,5,5]
>
> How can I make it happen?

def counter(n=5, length=5):
     for i in xrange(n ** length):
         x = []
         for j in range(length):
             i, r = divmod(i, n)
             x.append(r)
         yield [k+1 for k in x[::-1]]

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From anon at blank.com  Tue Mar 30 18:00:13 2010
From: anon at blank.com (anon)
Date: Tue, 30 Mar 2010 23:00:13 +0100
Subject: A question about making a sort-of-counter.
In-Reply-To: <mailman.1332.1269985213.23598.python-list@python.org>
References: <mailman.1332.1269985213.23598.python-list@python.org>
Message-ID: <Qvusn.336199$2R.198964@newsfe11.ams2>

Justin Park wrote:
> Suppose I have a list.
> a = list()
> And suppose allowed digits as the element are 1,2,3,4,5.
> 
> What can I do in order to iterate over all possible values for each element?
> For instance, the sequence of the list I want to have would be
> [1,1,1,1,1]
> [1,1,1,1,2]
> [1,1,1,1,3]
> 
> ....
> 
> [5,5,5,5,4]
> [5,5,5,5,5]
> 
> How can I make it happen?
> 
> Thanks,
> Justin.


http://docs.python.org/library/itertools.html#itertools.product

from itertools import product

for item in product([1, 2], repeat=2):
     print item


From invalid at invalid.invalid  Tue Mar 30 18:01:14 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Tue, 30 Mar 2010 22:01:14 +0000 (UTC)
Subject: Can't get odtwriter to work
Message-ID: <hotsba$615$1@reader1.panix.com>

I just installed odtwriter 1.3d on a Gentoo system running Python
2.6.4.  I used the normal "python setup.py build" then "python
setup.py install" method. But, odtwriter doesn't seem to work:

    rst2odt.py --help

    Traceback (most recent call last):
      File "/usr/bin/rst2odt.py", line 5, in <module>
        pkg_resources.run_script('odtwriter==1.3d', 'rst2odt.py')
      File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 461, in run_script
        self.require(requires)[0].run_script(script_name, ns)
      File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 1194, in run_script
        execfile(script_filename, namespace, namespace)
      File "/usr/lib/python2.6/site-packages/odtwriter-1.3d-py2.6.egg/EGG-INFO/scripts/rst2odt.py", line 21, in <module>
        from docutils.writers.odtwriter import Writer, Reader
    ImportError: No module named odtwriter

I verified that I have docutils installed:

    Python 2.6.4 (r264:75706, Mar  1 2010, 10:33:43) 
    [GCC 4.1.2 (Gentoo 4.1.2 p1.1)] on linux2
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import docutils
    >>> docutils
    <module 'docutils' from '/usr/lib/python2.6/site-packages/docutils/__init__.pyc'>

What am I doing wrong?    

-- 
Grant Edwards               grant.b.edwards        Yow! LOOK!!  Sullen
                                  at               American teens wearing
                              gmail.com            MADRAS shorts and "Flock of
                                                   Seagulls" HAIRCUTS!


From crebert at ucsd.edu  Tue Mar 30 18:08:17 2010
From: crebert at ucsd.edu (Chris Rebert)
Date: Tue, 30 Mar 2010 15:08:17 -0700
Subject: A question about making a sort-of-counter.
In-Reply-To: <4BB26DCE.7070307@rice.edu>
References: <4BB26DCE.7070307@rice.edu>
Message-ID: <50697b2c1003301508w7dca3ab0pb9468a7a90afdd45@mail.gmail.com>

On Tue, Mar 30, 2010 at 2:31 PM, Justin Park <hp6 at rice.edu> wrote:
> Suppose I have a list.
> a = list()
> And suppose allowed digits as the element are 1,2,3,4,5.
>
> What can I do in order to iterate over all possible values for each element?
> For instance, the sequence of the list I want to have would be
> [1,1,1,1,1]
> [1,1,1,1,2]
> [1,1,1,1,3]
>
> ....
>
> [5,5,5,5,4]
> [5,5,5,5,5]
>
> How can I make it happen?

allowed = range(1,6)
length = 5
for counter_tuple in product(allowed, repeat=length):
    counter_list = list(counter_tuple) # if you really need a list
    #do whatever with the counter value

See the docs for itertools.product(); an example virtually identical
to your situation is given:
http://docs.python.org/library/itertools.html#itertools.product

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


From hp6 at rice.edu  Tue Mar 30 18:12:28 2010
From: hp6 at rice.edu (Justin Park)
Date: Tue, 30 Mar 2010 17:12:28 -0500
Subject: A question about making a sort-of-counter.
In-Reply-To: <50697b2c1003301508w7dca3ab0pb9468a7a90afdd45@mail.gmail.com>
References: <4BB26DCE.7070307@rice.edu>
	<50697b2c1003301508w7dca3ab0pb9468a7a90afdd45@mail.gmail.com>
Message-ID: <4BB2774C.7040906@rice.edu>

Thanks!
It works!

Justin.

Chris Rebert wrote:
> On Tue, Mar 30, 2010 at 2:31 PM, Justin Park <hp6 at rice.edu> wrote:
>   
>> Suppose I have a list.
>> a = list()
>> And suppose allowed digits as the element are 1,2,3,4,5.
>>
>> What can I do in order to iterate over all possible values for each element?
>> For instance, the sequence of the list I want to have would be
>> [1,1,1,1,1]
>> [1,1,1,1,2]
>> [1,1,1,1,3]
>>
>> ....
>>
>> [5,5,5,5,4]
>> [5,5,5,5,5]
>>
>> How can I make it happen?
>>     
>
> allowed = range(1,6)
> length = 5
> for counter_tuple in product(allowed, repeat=length):
>     counter_list = list(counter_tuple) # if you really need a list
>     #do whatever with the counter value
>
> See the docs for itertools.product(); an example virtually identical
> to your situation is given:
> http://docs.python.org/library/itertools.html#itertools.product
>
> Cheers,
> Chris
> --
> http://blog.rebertia.com
>
>   


From apt.shansen at gmail.invalid  Tue Mar 30 18:17:28 2010
From: apt.shansen at gmail.invalid (Stephen Hansen)
Date: Tue, 30 Mar 2010 15:17:28 -0700
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
	<mailman.1326.1269971785.23598.python-list@python.org>
	<20100330201609.6ef12ee1@vulcan.local>
	<87sk7h8vns.fsf@castleamber.com>
	<20100330221600.42cd3536@vulcan.local>
Message-ID: <2010033015172862741-aptshansen@gmailinvalid>

On 2010-03-30 13:16:00 -0700, Robert Fendt said:
> 
> I find such a convoluted construct especially ugly in a language
> which I previously regarded as having a rather striking beauty
> of syntactical simplicity. The construct is superfluous,
> illogical, unelegant, and thus very un-pythonesque, IMHO. But of
> course that's just my $0.02.

In Python before list-comprehensions, I might have agreed with you. 
Initially, I was quite resistant to list comprehensions as well. They 
seemed ugly, and backwards, and why not just write a for loop?

Then I got used to them, and I find they are very elegant when used 
properly. Sometimes you can do something ugly with them, but its 
actually quite possible to write positively hideous Python even without 
any of these new fancy shmancy features.

But, in the post-comprehension world, where one can do:

my_odds = [x for x in range(100) if x % 2 == 1]

Things have changed. I've now grown used to reading expressions like 
that which seem a bit backwards, with the value being returned by an 
expression is the left-most element. Its not an exact correlation 
because they're answering different problems.

But having gotten used to list comprehensions, and actually quite 
appreciating their elegance now, I find this reads very well:

is_odd = "odd" if x % 2 == 1 else "even"

In fact, it reads better then any of the other conditional expression 
syntaxes people proposed back in the day, and a LOT better then what 
was done before:

is_odd = x % 2 == 1 and "odd" or "even"

Even if the above falls a bit more in line with what other languages 
usually do order-wise, this isn't other languages.

Now, none of this addresses your original argument of why not just use 
a regular if statement.

I dunno, I often used "and/or" for simple expressions or defaults and 
found it very convienent and made code more readable then the line and 
whitespace inducing true if-statement. And so I'm glad to have 
something even more readable and without the bug-prone and/or error.

Why not just use a for loop anytime you use a list comprehension? :) 
Same question really applies.

-- 
--S

... p.s: change the ".invalid" to ".com" in email address to reply privately.



From invalid at invalid.invalid  Tue Mar 30 18:20:29 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Tue, 30 Mar 2010 22:20:29 +0000 (UTC)
Subject: Can't get odtwriter to work
References: <hotsba$615$1@reader1.panix.com>
Message-ID: <hottfd$mdd$1@reader1.panix.com>

On 2010-03-30, Grant Edwards <invalid at invalid.invalid> wrote:

> I just installed odtwriter 1.3d on a Gentoo system running Python
> 2.6.4.  I used the normal "python setup.py build" then "python
> setup.py install" method. But, odtwriter doesn't seem to work:
>
>     rst2odt.py --help
>
>     Traceback (most recent call last):
>       File "/usr/bin/rst2odt.py", line 5, in <module>
>         pkg_resources.run_script('odtwriter==1.3d', 'rst2odt.py')
>       File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 461, in run_script
>         self.require(requires)[0].run_script(script_name, ns)
>       File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 1194, in run_script
>         execfile(script_filename, namespace, namespace)
>       File "/usr/lib/python2.6/site-packages/odtwriter-1.3d-py2.6.egg/EGG-INFO/scripts/rst2odt.py", line 21, in <module>
>         from docutils.writers.odtwriter import Writer, Reader
>     ImportError: No module named odtwriter
>
> I verified that I have docutils installed:
>
>     Python 2.6.4 (r264:75706, Mar  1 2010, 10:33:43) 
>     [GCC 4.1.2 (Gentoo 4.1.2 p1.1)] on linux2
>     Type "help", "copyright", "credits" or "license" for more information.
>     >>> import docutils
>     >>> docutils
>     <module 'docutils' from '/usr/lib/python2.6/site-packages/docutils/__init__.pyc'>
>
> What am I doing wrong?    

I'm not sure what/if I did wrong when installing docutils/odtwriter,
but I managed to make it work by manually copying everything from

  /usr/lib/python2.6/site-packages/odtwriter-1.3d-py2.6.egg/docutils/writers

    to

  /usr/lib/python2.6/site-packages/docutils/writers 

I think that means that odtwriter's setup.py is old/broken, but I
don't know enough to fix it...

-- 
Grant Edwards               grant.b.edwards        Yow! I'm having a MID-WEEK
                                  at               CRISIS!
                              gmail.com            


From no.spam at local.local  Tue Mar 30 18:32:41 2010
From: no.spam at local.local (Robert Fendt)
Date: Wed, 31 Mar 2010 00:32:41 +0200
Subject: "Usability, the Soul of Python"
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
	<4bb14173$0$1640$742ec2ed@news.sonic.net>
	<mailman.1300.1269939807.23598.python-list@python.org>
	<hosnrh$6na$1@news.eternal-september.org>
Message-ID: <20100331003241.47fa91f6@vulcan.local>

And thus spake "Alf P. Steinbach" <alfps at start.no>
Tue, 30 Mar 2010 13:40:22 +0200:

> <quote>
>  From a usability standpoint, the braces go with the lines to print out the 
> stanza rather than the for statement or the code after, so the following is best:
> 
> for(i = 99; i > 0; ++i)
>      {
>      printf("%d slabs of spam in my mail!\n", i);
>      printf("%d slabs of spam,\n", i);
>      printf("Send one to abuse and Just Hit Delete,\n");
>      printf("%d slabs of spam in my mail!\n\n", i + 1);
>      }
> </quote>

I liked this one even more:

<quote>
One way of writing the same code in Python would be:

count = 99
while count > 0:
    print u'%d slabs of spam in my mail!' % count
    print u'%d slabs of spam,' % count
    print u'Send one to abuse and Just Hit Delete,'
    count += 1
    print u'%d slabs of spam in my mail!' % count
    print u''

The braces are gone, and with them the holy wars. Whatever brace
styles Python programmers may happen to use in languages with
braces, all the Python code looks the same, and while the major
brace styles illustrated above are a few of many ways the C code
could be laid out, there's only one real way to do it.
</quote>

Has the fact changed that Python does not care about (1) how
many characaters you use for indentation, (1a) you can use tabs
OR spaces, (2) indentation does not have to be consistent across
a module, (3) not even across a file, (4) even in nested blocks
and (5) you can even switch from spaces to tabs and back in the
same file? So much for 'all the Python code looks the same'.

In general I do not really see what qualifies the author for an
article on Python's usability. On the same site one can also
find a lot of things e.g. on intelligent design and creationism,
and the 'The Case For Uncreative Web Design' in which the author
advocates 'uncreative' (in the sense of non-distracting) web
design while at the same time showcasing quite the opposite:
suffice it to say I found most essays rather difficult to read
from a technical point of view, to say nothing about the content.

Regards,
Robert



From anton.shishkov at gmail.com  Tue Mar 30 18:45:03 2010
From: anton.shishkov at gmail.com (ASh)
Date: Tue, 30 Mar 2010 15:45:03 -0700 (PDT)
Subject: psycopg2 / psycopg2.DataError: invalid input syntax for type 
	timestamp with time zone:
References: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>
	<mailman.1331.1269984417.23598.python-list@python.org>
Message-ID: <d0de705c-c9c8-45e4-894f-2ea56219fb86@30g2000yqi.googlegroups.com>

On Mar 31, 12:26?am, Philip Semanchuk <phi... at semanchuk.com> wrote:
> On Mar 30, 2010, at 4:47 PM, ASh wrote:
>
> > Hi, please help me understand why am I getting error with this query
>
> > ? ? ? ? ? ?new_start_date = "NOW() - '29 days'::INTERVAL"
> > ? ? ? ? ? ?self.dyndb.orderdb.query('''update xxxx set creation_date
> > = %s
> > ? ? ? ? ? ?where id_order = %s''', (new_start_date, "123"))
>
> > ...
> > psycopg2.DataError: invalid input syntax for type timestamp with time
> > zone: "NOW() - '29 days'::INTERVAL"
>
> Hi Anton,
> It sounds to me like the problem is with your SQL rather than with ?
> psycopg2 or Python. Try the query directly in Postgres -- does it work ?
> there? If so, then your next step should be to ask on the psycopg2 ?
> mailing list that Google can find for you.
>
> Good luck
> Philip

sql itself is correct


From anton.shishkov at gmail.com  Tue Mar 30 18:46:12 2010
From: anton.shishkov at gmail.com (ASh)
Date: Tue, 30 Mar 2010 15:46:12 -0700 (PDT)
Subject: psycopg2 / psycopg2.DataError: invalid input syntax for type 
	timestamp with time zone:
References: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>
	<mailman.1336.1269985882.23598.python-list@python.org>
Message-ID: <e9994806-5a52-4b9a-a4fe-66cf6625e3c9@l25g2000yqd.googlegroups.com>

On Mar 31, 12:50?am, "D'Arcy J.M. Cain" <da... at druid.net> wrote:
> On Tue, 30 Mar 2010 13:47:42 -0700 (PDT)
>
> ASh <anton.shish... at gmail.com> wrote:
> > Hi, please help me understand why am I getting error with this query
>
> > ? ? ? ? ? ? new_start_date = "NOW() - '29 days'::INTERVAL"
> > ? ? ? ? ? ? self.dyndb.orderdb.query('''update xxxx set creation_date
> > = %s
> > ? ? ? ? ? ? where id_order = %s''', (new_start_date, "123"))
>
> Put single quotes around the first %s in the query.
>
> --
> D'Arcy J.M. Cain <da... at druid.net> ? ? ? ? | ?Democracy is three wolveshttp://www.druid.net/darcy/? ? ? ? ? ? ? ?| ?and a sheep voting on
> +1 416 425 1212 ? ? (DoD#0082) ? ?(eNTP) ? | ?what's for dinner.

Tried like you said, got this error:

psycopg2.ProgrammingError: syntax error at or near "NOW"
LINE 1: update orderdb.orders set creation_date = 'E'NOW() - ''29
da...
                                                     ^


From hp6 at rice.edu  Tue Mar 30 18:50:18 2010
From: hp6 at rice.edu (Justin Park)
Date: Tue, 30 Mar 2010 17:50:18 -0500
Subject: Sometimes the python shell cannot recognize the presence of an
	attribute. 
Message-ID: <4BB2802A.7050500@rice.edu>

Sometimes when I am working on an already generated package,
the python shell cannot perceive the presence of an attribute that I
implemented on top of what was there.

Is there a way to have it perceive newly created attributes?

Thanks,
Justin.


From hp6 at rice.edu  Tue Mar 30 18:57:37 2010
From: hp6 at rice.edu (Justin Park)
Date: Tue, 30 Mar 2010 17:57:37 -0500
Subject: Sometimes the python shell cannot recognize the presence of an
	attribute.
In-Reply-To: <4BB2802A.7050500@rice.edu>
References: <4BB2802A.7050500@rice.edu>
Message-ID: <4BB281E1.2030101@rice.edu>

Sorry, my mistake.

The real problem is this.
When I started working on the package, somehow all of indentations were
made by space-bars instead of using tabs.
But when I am implementing my own on top of it, I still use tabs to make
indentations.

This is causing a problem.
I have to either conform to their style and change all my tabs to the
space-bars making up those spaces,
or change all indentations in the previous implementations by tabs.
But both the previous implementations and what I am going to do are also
so large that either way is not going to be efficient.

What can I do in order to resolve this issue?

Thanks,
Justin.

Justin Park wrote:
> Sometimes when I am working on an already generated package,
> the python shell cannot perceive the presence of an attribute that I
> implemented on top of what was there.
>
> Is there a way to have it perceive newly created attributes?
>
> Thanks,
> Justin.
>
>   


From ldo at geek-central.gen.new_zealand  Tue Mar 30 19:18:21 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 31 Mar 2010 12:18:21 +1300
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<7316f3d2-bcc9-4a1a-8598-cdd5d41fd74b@k17g2000yqb.googlegroups.com>
Message-ID: <hou0rt$69n$2@lust.ihug.co.nz>

In message <7316f3d2-bcc9-4a1a-8598-
cdd5d41fd74b at k17g2000yqb.googlegroups.com>, Joaquin Abian wrote:

> (a==b) and 'YES' or 'NO'
> 
> Yes, ugly

Why would you say that?s ugly?

By the way, you don?t need the parentheses.


From clp2 at rebertia.com  Tue Mar 30 19:20:32 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 30 Mar 2010 16:20:32 -0700
Subject: "Usability, the Soul of Python"
In-Reply-To: <20100331003241.47fa91f6@vulcan.local>
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
	<4bb14173$0$1640$742ec2ed@news.sonic.net>
	<mailman.1300.1269939807.23598.python-list@python.org>
	<hosnrh$6na$1@news.eternal-september.org>
	<20100331003241.47fa91f6@vulcan.local>
Message-ID: <50697b2c1003301620j376e4787xa8763cb0d21bd2f1@mail.gmail.com>

On Tue, Mar 30, 2010 at 3:32 PM, Robert Fendt <no.spam at local.local> wrote:
> And thus spake "Alf P. Steinbach" <alfps at start.no>
> Tue, 30 Mar 2010 13:40:22 +0200:
>> <quote>
>> ?From a usability standpoint, the braces go with the lines to print out the
>> stanza rather than the for statement or the code after, so the following is best:
>>
>> for(i = 99; i > 0; ++i)
>> ? ? ?{
>> ? ? ?printf("%d slabs of spam in my mail!\n", i);
>> ? ? ?printf("%d slabs of spam,\n", i);
>> ? ? ?printf("Send one to abuse and Just Hit Delete,\n");
>> ? ? ?printf("%d slabs of spam in my mail!\n\n", i + 1);
>> ? ? ?}
>> </quote>
>
> I liked this one even more:
>
> <quote>
> One way of writing the same code in Python would be:
>
> count = 99
> while count > 0:
> ? ?print u'%d slabs of spam in my mail!' % count
> ? ?print u'%d slabs of spam,' % count
> ? ?print u'Send one to abuse and Just Hit Delete,'
> ? ?count += 1
> ? ?print u'%d slabs of spam in my mail!' % count
> ? ?print u''
>
> The braces are gone, and with them the holy wars. Whatever brace
> styles Python programmers may happen to use in languages with
> braces, all the Python code looks the same, and while the major
> brace styles illustrated above are a few of many ways the C code
> could be laid out, there's only one real way to do it.
> </quote>
>
> Has the fact changed that Python does not care about (1) how
> many characaters you use for indentation, (1a) you can use tabs
> OR spaces, (2) indentation does not have to be consistent across
> a module, (3) not even across a file, (4) even in nested blocks
> and (5) you can even switch from spaces to tabs and back in the
> same file? So much for 'all the Python code looks the same'.

Since we're harping on block delimitation, I'll plug a post I did on
the subject a little while ago:
http://blog.rebertia.com/2010/01/24/of-braces-and-semicolons/

Hopefully it's more thorough than the OP's.

Cheers,
Chris


From ldo at geek-central.gen.new_zealand  Tue Mar 30 19:23:46 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 31 Mar 2010 12:23:46 +1300
Subject: "Usability, the Soul of Python"
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
	<4bb14173$0$1640$742ec2ed@news.sonic.net>
	<mailman.1300.1269939807.23598.python-list@python.org>
	<hosnrh$6na$1@news.eternal-september.org>
	<20100331003241.47fa91f6@vulcan.local>
Message-ID: <hou162$69n$3@lust.ihug.co.nz>

In message <20100331003241.47fa91f6 at vulcan.local>, Robert Fendt wrote:

> The braces are gone, and with them the holy wars.

Let me start a new one. I would still put in some kind of explicit indicator 
of the end of the grouping construct:

    count = 99
    while count > 0:
        print u'%d slabs of spam in my mail!' % count
        print u'%d slabs of spam,' % count
        print u'Send one to abuse and Just Hit Delete,'
        count += 1
        print u'%d slabs of spam in my mail!' % count
        print u''
    #end while



From see at sig.for.address  Tue Mar 30 19:25:38 2010
From: see at sig.for.address (Victor Eijkhout)
Date: Tue, 30 Mar 2010 18:25:38 -0500
Subject: sort array, apply rearrangement to second
Message-ID: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>

I have two arrays, made with numpy. The first one has values that I want
to use as sorting keys; the second one needs to be sorted by those keys.
Obviously I could turn them into a dictionary  of pairs and sort by the
first member, but I think that's not very efficient, at least in space,
and this needs to be done as efficiently as possible.

I could use a hand.

Victor.
-- 
Victor Eijkhout -- eijkhout at tacc utexas edu


From ldo at geek-central.gen.new_zealand  Tue Mar 30 19:32:42 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 31 Mar 2010 12:32:42 +1300
Subject: "Usability, the Soul of Python"
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
	<4bb14173$0$1640$742ec2ed@news.sonic.net>
	<mailman.1300.1269939807.23598.python-list@python.org>
	<hosnrh$6na$1@news.eternal-september.org>
Message-ID: <hou1mr$6ur$1@lust.ihug.co.nz>

In message <hosnrh$6na$1 at news.eternal-september.org>, Alf P. Steinbach 
wrote:

> This is just unsubstantiated opinion, but worse, it makes a tacit
> assumption that there is "best" way to do indentation. However, most
> programmers fall into that trap, and I've done it myself.

Having used so many different languages over the years, I have settled on a 
reasonably common set of indentation conventions that work across most of 
them.

The only one that currently annoys me is JavaScript, because its semicolons-
are-optional rule means that certain ways I write statements continued 
across multiple lines are interpreted as prematurely completing the 
statement.

In revenge for that, I refuse to put optional semicolons in my JavaScript 
code altogether.

> I may or may not have been responsible for the similarly impractical
> compromise convention of using three spaces per indentation level. At
> least, in one big meeting the question about number of spaces was raised
> by the speaker, and I replied from the benches, just in jest, "three!".
> And that was it (perhaps).

I use four. Why four? Because it?s divisible by two. Because I use the half-
step (two columns) for lines containing nothing but bracketing symbols:

    for (i = 99; i > 0; --i)
       {
         printf("%d slabs of spam in my mail!\n", i);
         printf("%d slabs of spam,\n", i);
         printf("Send one to abuse and Just Hit Delete,\n");
         printf("%d slabs of spam in my mail!\n\n", i - 1);
       } /*for*/

    for i := 99 downto 1 do
      begin
         writeln(i, " slabs of spam in my mail!");
         writeln(i, " slabs of spam,");
         writeln("Send one to abuse and Just Hit Delete,");
         writeln(i - 1, " slabs of spam in my mail!\n\n")
      end {for}

Actually this looks like another opportunity for a loop-with-exit-in-the-
middle:

    for (i = 99;;)
      {
         printf("%d slabs of spam in my mail!\n", i);
         printf("%d slabs of spam,\n", i);
         printf("Send one to abuse and Just Hit Delete,\n");
         --i;
         if (i == 0)
            break;
         printf("%d slabs of spam in my mail!\n\n", i);
      } /*for*/



From hidura at gmail.com  Tue Mar 30 19:33:25 2010
From: hidura at gmail.com (hidura at gmail.com)
Date: Tue, 30 Mar 2010 23:33:25 +0000
Subject: Fetch files from mail in python
Message-ID: <0016e6470e5c57735f04830d0e5a@google.com>

Hello list, i want to know how could i fetch a file from an email, what  
kind of library i have to use for that, actually i am working in the  
support of IMAP and POP3.

Thanks.


Diego I. Hidalgo D.
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From clp2 at rebertia.com  Tue Mar 30 19:39:08 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 30 Mar 2010 16:39:08 -0700
Subject: Fetch files from mail in python
In-Reply-To: <0016e6470e5c57735f04830d0e5a@google.com>
References: <0016e6470e5c57735f04830d0e5a@google.com>
Message-ID: <50697b2c1003301639l4fa75583mc4b290b4c83664cf@mail.gmail.com>

On Tue, Mar 30, 2010 at 4:33 PM,  <hidura at gmail.com> wrote:
> Hello list, i want to know how could i fetch a file from an email, what kind
> of library i have to use for that, actually i am working in the support of
> IMAP and POP3.

Next time, consult the Global Module Index
(http://docs.python.org/modindex.html) before posting.

IMAP: http://docs.python.org/library/imaplib.html
POP: http://docs.python.org/library/poplib.html

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


From steve at holdenweb.com  Tue Mar 30 19:43:41 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 30 Mar 2010 19:43:41 -0400
Subject: (a==b) ? 'Yes' : 'No'
In-Reply-To: <hou0rt$69n$2@lust.ihug.co.nz>
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>	<7316f3d2-bcc9-4a1a-8598-cdd5d41fd74b@k17g2000yqb.googlegroups.com>
	<hou0rt$69n$2@lust.ihug.co.nz>
Message-ID: <hou2bh$1g0$1@dough.gmane.org>

Lawrence D'Oliveiro wrote:
> In message <7316f3d2-bcc9-4a1a-8598-
> cdd5d41fd74b at k17g2000yqb.googlegroups.com>, Joaquin Abian wrote:
> 
>> (a==b) and 'YES' or 'NO'
>>
>> Yes, ugly
> 
> Why would you say that?s ugly?
> 
> By the way, you don?t need the parentheses.

But at the same time, if you don't *absolutely know* you don't need the
parentheses then the parentheses are a very good idea, so I applaud the
example as Pythonic while agreeing that it's ugly. A conditional
expression seems more natural.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Tue Mar 30 19:44:53 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 30 Mar 2010 19:44:53 -0400
Subject: psycopg2 / psycopg2.DataError: invalid input syntax for type
	timestamp with time zone:
In-Reply-To: <20100330175056.ca69563c.darcy@druid.net>
References: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>
	<20100330175056.ca69563c.darcy@druid.net>
Message-ID: <hou2dp$1g0$2@dough.gmane.org>

D'Arcy J.M. Cain wrote:
> On Tue, 30 Mar 2010 13:47:42 -0700 (PDT)
> ASh <anton.shishkov at gmail.com> wrote:
>> Hi, please help me understand why am I getting error with this query
>>
>>
>>             new_start_date = "NOW() - '29 days'::INTERVAL"
>>             self.dyndb.orderdb.query('''update xxxx set creation_date
>> = %s
>>             where id_order = %s''', (new_start_date, "123"))
> 
> Put single quotes around the first %s in the query.
> 
And in future please tell us exactly what error you are trying to
explain by quoting the traceback exactly.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From alfps at start.no  Tue Mar 30 19:45:35 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 31 Mar 2010 01:45:35 +0200
Subject: sort array, apply rearrangement to second
In-Reply-To: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
References: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
Message-ID: <hou2fn$4ds$1@news.eternal-september.org>

* Victor Eijkhout:
> I have two arrays, made with numpy. The first one has values that I want
> to use as sorting keys; the second one needs to be sorted by those keys.
> Obviously I could turn them into a dictionary  of pairs and sort by the
> first member, but I think that's not very efficient, at least in space,
> and this needs to be done as efficiently as possible.
> 
> I could use a hand.

Just do the pairing, but in a 'list', not a dictionary (a dictionary is 
unordered and can't be sorted). You need to keep track of which keys belong to 
which values anyway. And anything in Python is a reference: you're not copying 
the data by creating the pairs. That is, the space overhead is proportional to 
the number of items but is independent of the data size of each item.


Cheers & hth.,

- Alf


From steve at holdenweb.com  Tue Mar 30 19:52:25 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 30 Mar 2010 19:52:25 -0400
Subject: Sometimes the python shell cannot recognize the presence of an
	attribute.
In-Reply-To: <4BB281E1.2030101@rice.edu>
References: <4BB2802A.7050500@rice.edu> <4BB281E1.2030101@rice.edu>
Message-ID: <hou2rt$3gj$1@dough.gmane.org>

Justin Park wrote:
> Sorry, my mistake.
> 
> The real problem is this.
> When I started working on the package, somehow all of indentations were
> made by space-bars instead of using tabs.
> But when I am implementing my own on top of it, I still use tabs to make
> indentations.
> 
> This is causing a problem.
> I have to either conform to their style and change all my tabs to the
> space-bars making up those spaces,
> or change all indentations in the previous implementations by tabs.
> But both the previous implementations and what I am going to do are also
> so large that either way is not going to be efficient.
> 
> What can I do in order to resolve this issue?
> 
You might try Googling for "expandtabs". This isn't a new problem,
though I agree it can be very vexing when it's new to you ;-)

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Tue Mar 30 19:56:25 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 30 Mar 2010 19:56:25 -0400
Subject: sort array, apply rearrangement to second
In-Reply-To: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
References: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
Message-ID: <hou33e$4io$1@dough.gmane.org>

Victor Eijkhout wrote:
> I have two arrays, made with numpy. The first one has values that I want
> to use as sorting keys; the second one needs to be sorted by those keys.
> Obviously I could turn them into a dictionary  of pairs and sort by the
> first member, but I think that's not very efficient, at least in space,
> and this needs to be done as efficiently as possible.
> 
> I could use a hand.
> 
Well, my first approach would be to do it as inefficiently as I can ( or
at least no more efficiently than I can with a simple-minded approach)
and then take it from there.

If I believe this is not a premature optimization (a question about
which I am currently skeptical) I'd suggest conversion to a list of
pairs rather than a dict.

Can you use zip() on numpy arrays? That would be the easiest way to
create the list of pairs.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From darcy at druid.net  Tue Mar 30 20:10:34 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Tue, 30 Mar 2010 20:10:34 -0400
Subject: psycopg2 / psycopg2.DataError: invalid input syntax for type 
	timestamp with time zone:
In-Reply-To: <e9994806-5a52-4b9a-a4fe-66cf6625e3c9@l25g2000yqd.googlegroups.com>
References: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>
	<mailman.1336.1269985882.23598.python-list@python.org>
	<e9994806-5a52-4b9a-a4fe-66cf6625e3c9@l25g2000yqd.googlegroups.com>
Message-ID: <20100330201034.020c3bf6.darcy@druid.net>

On Tue, 30 Mar 2010 15:46:12 -0700 (PDT)
ASh <anton.shishkov at gmail.com> wrote:
> > > ? ? ? ? ? ? new_start_date = "NOW() - '29 days'::INTERVAL"
> > > ? ? ? ? ? ? self.dyndb.orderdb.query('''update xxxx set creation_date
> > > = %s
> > > ? ? ? ? ? ? where id_order = %s''', (new_start_date, "123"))
> >
> > Put single quotes around the first %s in the query.
> 
> Tried like you said, got this error:
> 
> psycopg2.ProgrammingError: syntax error at or near "NOW"
> LINE 1: update orderdb.orders set creation_date = 'E'NOW() - ''29
> da...

Right.  I misread it.  Please show us the exact error that you get with
the original code.

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


From steve at holdenweb.com  Tue Mar 30 20:12:54 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 30 Mar 2010 20:12:54 -0400
Subject: "Usability, the Soul of Python"
In-Reply-To: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
Message-ID: <hou42b$72d$1@dough.gmane.org>

Jonathan Hayward wrote:
> I've posted "Usability, the Soul of Python: An Introduction to the
> Python Programming Language Through the Eyes of Usability", at:
> 
>    http://JonathansCorner.com/python/
> 
> The basic suggestion is that much of what works well in Python has
> something to do with the usability it offers programmers.
> 
> Enjoy.
> 
Now try another one called "Brevity, the Soul of Technical Writing: An
Introduction to Making Yourself Understood Through the Eyes of Readability".

What I managed to read seemed to be making worthwhile points, but I felt
a bit like I was wading through a steaming pile of irrelevant verbiage
that actually made it more difficult to extract the useful nuggets.

Bravo for undertaking this task, but I do feel the treatment needs work
from a good copy editor.

Of course you have to take into account my allergy to folksy metaphors
and meandering discourse. Had I chosen your style I might instead have
written the criticism above as:

"""
I would like to begin my critique of this paper with a feature that many
competent technical writers completely fail to appreciate: why brevity
is desirable in technical writing.

Technical writing is not, of course, the only form of writing that there
is. People have been writing ever since the first caveman decided he
could leave marks on the wall of a cave to indicate that food could be
had in the vicinity. The basic concept of brevity is that you should
not, as a writer, use superfluous words because if you do then the
reader will always be in doubt about which parts of your discourse are
meaningful and which are merely decoration.

...
"""

And so on. As I say, this may be criticism dictated by my personal
taste, but I feel you could condense the presentation considerably to
good effect. Sorry if this offends. It's meant to help.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From python at mrabarnett.plus.com  Tue Mar 30 20:13:16 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 31 Mar 2010 01:13:16 +0100
Subject: sort array, apply rearrangement to second
In-Reply-To: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
References: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
Message-ID: <4BB2939C.2040706@mrabarnett.plus.com>

Victor Eijkhout wrote:
> I have two arrays, made with numpy. The first one has values that I want
> to use as sorting keys; the second one needs to be sorted by those keys.
> Obviously I could turn them into a dictionary  of pairs and sort by the
> first member, but I think that's not very efficient, at least in space,
> and this needs to be done as efficiently as possible.
> 
> I could use a hand.
> 
You could sort a list of the indices, using the first array to provide
the keys.


From hidura at gmail.com  Tue Mar 30 20:47:47 2010
From: hidura at gmail.com (hidura at gmail.com)
Date: Wed, 31 Mar 2010 00:47:47 +0000
Subject: Fetch files from mail in python
In-Reply-To: <50697b2c1003301639l4fa75583mc4b290b4c83664cf@mail.gmail.com>
Message-ID: <0016e68ded464e17c304830e18f9@google.com>

I did that but i want to know if i have a file inside the mail how could i  
download that file from my mail.

On Mar 30, 2010 7:39pm, Chris Rebert <clp2 at rebertia.com> wrote:
> On Tue, Mar 30, 2010 at 4:33 PM, hidura at gmail.com> wrote:

> > Hello list, i want to know how could i fetch a file from an email, what  
> kind

> > of library i have to use for that, actually i am working in the support  
> of

> > IMAP and POP3.



> Next time, consult the Global Module Index

> (http://docs.python.org/modindex.html) before posting.



> IMAP: http://docs.python.org/library/imaplib.html

> POP: http://docs.python.org/library/poplib.html



> Cheers,

> Chris

> --

> http://blog.rebertia.com

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From clp2 at rebertia.com  Tue Mar 30 20:56:27 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 30 Mar 2010 17:56:27 -0700
Subject: Fetch files from mail in python
In-Reply-To: <0016e68ded464e17c304830e18f9@google.com>
References: <50697b2c1003301639l4fa75583mc4b290b4c83664cf@mail.gmail.com>
	<0016e68ded464e17c304830e18f9@google.com>
Message-ID: <50697b2c1003301756u3c169616o3dc2a7bebbe70219@mail.gmail.com>

> On Mar 30, 2010 7:39pm, Chris Rebert <clp2 at rebertia.com> wrote:
>> On Tue, Mar 30, 2010 at 4:33 PM, ?hidura at gmail.com> wrote:
>> > Hello list, i want to know how could i fetch a file from an email, what
>> > kind
>> > of library i have to use for that, actually i am working in the support
>> > of
>> > IMAP and POP3.
>>
>> IMAP: http://docs.python.org/library/imaplib.html
>> POP: http://docs.python.org/library/poplib.html

On Tue, Mar 30, 2010 at 5:47 PM,  <hidura at gmail.com> wrote:
> I did that but i want to know if i have a file inside the mail how could i
> download that file from my mail.

I believe you'd use the email.parser module:
http://docs.python.org/library/email.parser.html

Cheers,
Chris


From cs at zip.com.au  Tue Mar 30 21:04:43 2010
From: cs at zip.com.au (Cameron Simpson)
Date: Wed, 31 Mar 2010 12:04:43 +1100
Subject: "Usability, the Soul of Python"
In-Reply-To: <7f014ea61003300725yf3dfcbdw2976160ca37f60f3@mail.gmail.com>
References: <7f014ea61003300725yf3dfcbdw2976160ca37f60f3@mail.gmail.com>
Message-ID: <20100331010443.GA12592@cskk.homeip.net>

On 30Mar2010 10:25, Chris Colbert <sccolbert at gmail.com> wrote:
| not really, the int will eventually overflow and cycle around ;)
| 
| On Tue, Mar 30, 2010 at 8:11 AM, Xavier Ho <contact at xavierho.com> wrote:
| 
| > Did no one notice that
| > for(i = 99; i > 0; ++i)
| > Gives you an infinite loop (sort of) because i starts a 99, and increases
| > every loop?

And here we see the strength of the Usability example; in Python it
won't overflow, rather seguing seamlessly into an increasing expensive
arbitrary sized int. Though most machines will eventually run out of
memory to hold it...
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

Surely it was of this place, now Cambridge but formerly known by the name of
Babylon, that the prophet spoke when he said, 'the wild beasts of the desert
shall dwell there, and their houses shall be full of doleful creatures, and
owls shall build there, and satyrs shall dance there.'
        - Thomas Gray (1716-1771)


From john at castleamber.com  Tue Mar 30 21:22:42 2010
From: john at castleamber.com (John Bokma)
Date: Tue, 30 Mar 2010 19:22:42 -0600
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
	<mailman.1326.1269971785.23598.python-list@python.org>
	<20100330201609.6ef12ee1@vulcan.local>
	<87sk7h8vns.fsf@castleamber.com>
	<20100330221600.42cd3536@vulcan.local>
Message-ID: <87hbnxz3ml.fsf@castleamber.com>

Robert Fendt <no.spam at local.local> writes:

> And thus spake John Bokma <john at castleamber.com>
> Tue, 30 Mar 2010 13:19:19 -0600:
>
>> And
>> 
>>  a == b and 'Yes' or 'No' 
>> 
>> isn't a Perl-ism?
>
> I never said that this would be better.

It was not my intention to imply you did. But yet I do see books on
Python mention the and or usage, and personally I think the ... if
... else is preferable.

> point of what the advantage is supposed to be of inverting the
> order of the return statement and the conditional check what
> should actually _be_ returned. What's wrong with just writing
>
> if a==b:
>   return 'Yes'
> else:
>   return 'No'

To me the else is adding unneeded noise, I would just write:

if a==b:
    return 'Yes'

return 'No'

> apart from it being a few more line breaks and an additional
> return statement? The inverted form is not more readable per
> se (in fact, quite the opposite), and I would even suggest to
> minimise its use even in languages like C++ and Java. The Python
> syntax is even worse since it not only inverts the order of
> return statement and conditional check, but it also puts the
> conditional between the two results.

I use(d) the if ... else as follows (per Programming in Python 3):

list = [] if list is None else list

in Perl I would've written:

defined $list or $list = [];

Which I prefer over:

$list = [] unless defined $list;

and more over:

$list = [] if not defined $list;

To me the first Perl form reads as a pre-condition: the list must be
defined *or* make it so.

And maybe you're right, the Python one could've been written:

if list is None:
   list = []

which looks, now, also more readable to me as well.

>> Sheesh, this group would be so much nicer without the constant dragging
>> in of Perl to make a point. On top of that, do {  } unless blocks are
>> not idomatic in Perl. Perl Best Practices even clearly states to *never*
>> use unless.
>
> Sorry, but you have just underlined my point, in fact. If it's
> discouraged by experts, then of course the question must be
> valid why such a feature even exists (okay, apart from 'it
> seemed like a good idea at the time').

I guess the latter. Perl has quite some things that in retrospect
could've been done better. On the other hand, Perl developers are very
fanatic about backwards compatibility, which makes it hard to remove
stuff like unless.

On top of that Perl can't be statically analyzed, meaning you can't just
write a perl4to5 or perl510to512 converter.

> And more importantly (and
> more on-topic here), why we have to have an analogon in Python.

My point. You can sufficiently argue what's wrong with if..else in
Python 3 without dragging Perl into it and staying in Python context. I
am both a Perl and (learning) Python programmer, and to be honest I get
very tired of the somewhat weekly

omg Perl suxxxorsss!!11111 

Each language has its own suckage. There are several reasons why while I
am learning Python I also keep updating my Perl skills ;-).

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From sccolbert at gmail.com  Tue Mar 30 21:59:32 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Tue, 30 Mar 2010 21:59:32 -0400
Subject: sort array, apply rearrangement to second
In-Reply-To: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
References: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
Message-ID: <q2t7f014ea61003301859p429db982o769b7804bd739b4d@mail.gmail.com>

On Tue, Mar 30, 2010 at 7:25 PM, Victor Eijkhout <see at sig.for.address>wrote:

> I have two arrays, made with numpy. The first one has values that I want
> to use as sorting keys; the second one needs to be sorted by those keys.
> Obviously I could turn them into a dictionary  of pairs and sort by the
> first member, but I think that's not very efficient, at least in space,
> and this needs to be done as efficiently as possible.
>
> I could use a hand.
>
> Victor.
> --
> Victor Eijkhout -- eijkhout at tacc utexas edu
> --
> http://mail.python.org/mailman/listinfo/python-list
>


I'm not quite sure what you are asking, but there is probably an efficient
way to do it in pure numpy. You can either post an example of what you want
here, or better, take it to the NumPy mailing list and I will help you
there.
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From sccolbert at gmail.com  Tue Mar 30 22:11:41 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Tue, 30 Mar 2010 22:11:41 -0400
Subject: sort array, apply rearrangement to second
In-Reply-To: <q2t7f014ea61003301859p429db982o769b7804bd739b4d@mail.gmail.com>
References: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
	<q2t7f014ea61003301859p429db982o769b7804bd739b4d@mail.gmail.com>
Message-ID: <j2w7f014ea61003301911scb40ef3bs48c58836fcd3e376@mail.gmail.com>

On Tue, Mar 30, 2010 at 9:59 PM, Chris Colbert <sccolbert at gmail.com> wrote:

>
>
> On Tue, Mar 30, 2010 at 7:25 PM, Victor Eijkhout <see at sig.for.address>wrote:
>
>> I have two arrays, made with numpy. The first one has values that I want
>> to use as sorting keys; the second one needs to be sorted by those keys.
>> Obviously I could turn them into a dictionary  of pairs and sort by the
>> first member, but I think that's not very efficient, at least in space,
>> and this needs to be done as efficiently as possible.
>>
>> I could use a hand.
>>
>> Victor.
>> --
>> Victor Eijkhout -- eijkhout at tacc utexas edu
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
> I'm not quite sure what you are asking, but there is probably an efficient
> way to do it in pure numpy. You can either post an example of what you want
> here, or better, take it to the NumPy mailing list and I will help you
> there.
>
>
This seems to be what you want:

http://stackoverflow.com/questions/1903462/how-can-i-zip-sort-parallel-numpy-arrays
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From russ.paielli at gmail.com  Tue Mar 30 22:18:50 2010
From: russ.paielli at gmail.com (Russ P.)
Date: Tue, 30 Mar 2010 19:18:50 -0700 (PDT)
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
Message-ID: <60a3bde8-c503-4d14-89f0-a68f683afd32@x3g2000yqd.googlegroups.com>

On Mar 30, 10:08?am, John Nagle <na... at animats.com> wrote:
> Chris Rebert wrote:
> > On Tue, Mar 30, 2010 at 8:40 AM, gentlestone <tibor.b... at hotmail.com> wrote:
> >> Hi, how can I write the popular C/JAVA syntax in Python?
>
> >> Java example:
> >> ? ?return (a==b) ? 'Yes' : 'No'
>
> >> My first idea is:
> >> ? ?return ('No','Yes')[bool(a==b)]
>
> >> Is there a more elegant/common python expression for this?
>
> > Yes, Python has ternary operator-like syntax:
> > return ('Yes' if a==b else 'No')
>
> > Note that this requires a recent version of Python.
>
> ? ? ?Who let the dogs in? ?That's awful syntax.
>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? John Nagle

Baloney. The Python ternary syntax is perfectly fine. The "if" could
have been put in front, as in Scala:

return if a == b "yes" else "no"

but either way is fine and perfectly readable as far as I am concerned.


From python.list at tim.thechases.com  Tue Mar 30 22:25:13 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 30 Mar 2010 21:25:13 -0500
Subject: (a==b) ? 'Yes' : 'No'
In-Reply-To: <87hbnxz3ml.fsf@castleamber.com>
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>	<mailman.1317.1269964918.23598.python-list@python.org>	<4bb22b39$0$1638$742ec2ed@news.sonic.net>	<mailman.1326.1269971785.23598.python-list@python.org>	<20100330201609.6ef12ee1@vulcan.local>	<87sk7h8vns.fsf@castleamber.com>	<20100330221600.42cd3536@vulcan.local>
	<87hbnxz3ml.fsf@castleamber.com>
Message-ID: <4BB2B289.9050301@tim.thechases.com>

John Bokma wrote:

> And maybe you're right, the Python one could've been written:
> 
> if list is None:
>    list = []
> 
> which looks, now, also more readable to me as well.

Though there's a slight difference[1], I'd usually use

   lst = lst or []

for your particular initialization use case.

-tkc

[1]
Difference being

   >>> lst = []
   >>> other = lst
   >>> if lst is None: # your code
   ...     lst = []
   ...
   >>> other.append(42)
   >>> lst, other
   ([42], [42])

   >>> lst = []
   >>> other = lst
   >>> lst = lst or [] # my proposal
   >>> other.append(42)
   >>> lst, other
   ([], [42])



From robert.kern at gmail.com  Tue Mar 30 23:00:38 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 30 Mar 2010 22:00:38 -0500
Subject: sort array, apply rearrangement to second
In-Reply-To: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
References: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
Message-ID: <houdtl$v0p$1@dough.gmane.org>

On 2010-03-30 18:25 , Victor Eijkhout wrote:
> I have two arrays, made with numpy. The first one has values that I want
> to use as sorting keys; the second one needs to be sorted by those keys.
> Obviously I could turn them into a dictionary  of pairs and sort by the
> first member, but I think that's not very efficient, at least in space,
> and this needs to be done as efficiently as possible.

second[first.argsort()]

Ask numpy questions on the numpy mailing list.

   http://www.scipy.org/Mailing_Lists

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From keeloh at rocketmail.com  Tue Mar 30 23:39:53 2010
From: keeloh at rocketmail.com (POOJA)
Date: Tue, 30 Mar 2010 20:39:53 -0700 (PDT)
Subject: Consolidate Credit Card Debt
Message-ID: <5270502a-1fc4-41cf-8427-30c5dee865fd@k5g2000prg.googlegroups.com>

Consolidate Credit Card Debt
------------------------------

http://sites.google.com/site/creditcarddebtconsolidation33


From gagsl-py2 at yahoo.com.ar  Wed Mar 31 02:22:54 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 31 Mar 2010 03:22:54 -0300
Subject: xpat error in xmlrp client. How to inspect data.
References: <4bab1f4a$0$25677$426a74cc@news.free.fr>
	<mailman.1297.1269923825.23598.python-list@python.org>
	<4bb266b5$0$21786$426a74cc@news.free.fr>
Message-ID: <op.vae5cgbwx6zn5v@lepton.softlabbsas.com.ar>

En Tue, 30 Mar 2010 18:01:40 -0300, News123 <news1234 at free.fr> escribi?:
> Gabriel Genellina wrote:
>> En Thu, 25 Mar 2010 05:31:05 -0300, News123 <news1234 at free.fr> escribi?:
>>
>>> I'm havign a small xmlrpc client, which works normally fine.
>>> (xmlrpc via https)
>>>
>>> Sometimes however I receive an Exception about an expat error.
>>>
>>>
>>> The output, that I receive is:
>>>   File "C:\mycode\myrpcclient.py", line 63, in upload_chunk
>>>     rslt = myrpcclient.call()
>>>   File "C:\Python26\lib\xmlrpclib.py", line 1199, in __call__
>>>     return self.__send(self.__name, args)
>>>   File "C:\Python26\lib\xmlrpclib.py", line 1489, in __request
>>>     verbose=self.__verbose
>>>   File "C:\Python26\lib\xmlrpclib.py", line 1253, in request
>>>     return self._parse_response(h.getfile(), sock)
>>>   File "C:\Python26\lib\xmlrpclib.py", line 1387, in _parse_response
>>>     p.feed(response)
>>>   File "C:\Python26\lib\xmlrpclib.py", line 601, in feed
>>>     self._parser.Parse(data, 0)
>>> ExpatError: syntax error: line 1, column 0
>>>
>>
>> a) Use the standard cgitb module (despite its name, it is useful outside
>> CGI scripts)
>>
>> b) Use the tb module available from http://pypi.python.org/pypi/tb
>>
> I'm currently using the default module traceback and code, which looks
> roughly like:
>
> try:
>   xmlrpccall()
> except Exception as e:
>   ex_type,ex_value,e_b = sys.exc_info()
>   tbstring = traceback.format_exc()
>   logging.error('%s:%s:%s' % (ex_type,ex_value,tbstring)
>
>
> do cgitb or tb really provide much more info?

Well, for each frame along the stack, cgitb shows the value of all  
function arguments, the value of each name referenced, and a few more  
lines of code around the current one. It's rather verbose, but doesn't  
include all local variables.

The tb module shows -also for each frame along the stack- the value of all  
its local names (but doesn't include any global one).

Just try both of them and see which one you like most.

>> d) In your exception handler, walk the traceback object until you reach
>> the feed() call, and inspect the corresponding tb_frame.f_locals
>> dictionary.
>
> How can I walk a traceback? For the current problem the the monkeypatch
> should be good enough, but for other cases it might be good to know.

Each traceback object is linked to the next one via its tb_next attribute.  
But inspect.trace() builds a list of traceback records that may be easier  
to handle; see the inspect module documentation. You can identify the  
desired frame with its filename and function name, and then access its  
local variables with f_locals.
I did something like that to gather context information for errors  
happening in a third party library that were hard to diagnose otherwise.

-- 
Gabriel Genellina



From frank at chagford.com  Wed Mar 31 02:49:04 2010
From: frank at chagford.com (Frank Millman)
Date: Wed, 31 Mar 2010 08:49:04 +0200
Subject: Sublassing tuple works, subclassing list does not
Message-ID: <hour90$vlc$1@dough.gmane.org>

Hi all

I needed something similar to, but not quite the same as, 
collections.namedtuple.

The differences are that namedtuple requires the 'names' to be provided at 
creation time, and then lends itself to creating multiple instances of 
itself. I wanted a more generic class where I could supply the 'names' and 
'values' at instantiation time.

I came up with a simple solution that seems to work -

>>> class MyTuple(tuple):
...   def __new__(cls, names, values):
...     for name, value in zip(names, values):
...       setattr(cls, name, value)
...     return tuple.__new__(cls, values)
...
>>> names = ['A', 'B', 'C']
>>> values = ['a', 'b', 'c']
>>>
>>> tup = MyTuple(names, values)
>>>
>>> print tup
('a', 'b', 'c')
>>>
>>> print tup[0]
a
>>>
>>> print tup.B
b
>>>

Then I had a need to add elements after the tuple had been created. As 
tuples are immutable, I thought it would be easy to change it to a list. 
However, it does not work -

>>> class MyList(list):
...   def __new__(cls, names, values):
...     for name, value in zip(names, values):
...       setattr(cls, name, value)
...     return list.__new__(cls, values)
...
>>> names = ['A', 'B', 'C']
>>> values = ['a', 'b', 'c']
>>>
>>> lst = MyList(names, values)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: list() takes at most 1 argument (2 given)
>>>

I can find a workaround, but I would be interested to know the reason why it 
does not work.

Version is 2.6.2.

Thanks

Frank Millman




From affdfsdfdsfsd at b.com  Wed Mar 31 03:47:32 2010
From: affdfsdfdsfsd at b.com (Tracubik)
Date: 31 Mar 2010 07:47:32 GMT
Subject: Python + OpenOffice Calc
Message-ID: <4bb2fe14$0$1120$4fafbaef@reader3.news.tin.it>

Hi all!
i'm giving away to a friend of mine that have a garage (he repair car) my 
old computer. He will use it essentialy to create estimates of the work 
via an ods file (i've made a simple ods file to be filled with the cost of 
materials and a description of the work).
He's totally new with computer and have difficult to fill the ods file, so 
i'ld like to create a simple python program that help him to introduce the 
data in to the ods file via a simple gui.
So what i'm looking for is a way in python to insert data in a particular 
cell of the ods file and possibly to save it and print it when it's full 
filled with data.

the guy is similar to this:

3 fields: quantity - description of the piece bought - price

a way to add a new "line" if needed (for a new piece entry) similar to the 
"add rule" in evolution

1 text field for the description of the work + 1 field for the price of 
the work

and off course a way to insert this data in to the ods file via python

Any hints/tutorial/info?

thanks
Nico


From __peter__ at web.de  Wed Mar 31 03:52:09 2010
From: __peter__ at web.de (Peter Otten)
Date: Wed, 31 Mar 2010 09:52:09 +0200
Subject: logging: local functions ==> loss of lineno
References: <mailman.576.1268256192.23598.python-list@python.org>
	<hnaj9c$i0u$02$1@news.t-online.com>
	<4BA295A1.70207@hellmutweber.de>
	<mailman.972.1268995215.23598.python-list@python.org>
	<hnvqe5$vc$02$1@news.t-online.com>
	<mailman.977.1269006574.23598.python-list@python.org>
	<ho21dt$b6v$00$1@news.t-online.com>
	<d35c950b-c6e5-4162-8175-3e0a0255c71a@30g2000yqi.googlegroups.com>
	<hocmak$ap$00$1@news.t-online.com>
	<b02720d8-a1b5-4133-a018-b3dd613be8e3@q21g2000yqm.googlegroups.com>
	<mailman.1335.1269985774.23598.python-list@python.org>
Message-ID: <houuto$ed9$02$1@news.t-online.com>

Hellmut Weber wrote:

> Hi Peter and Jean-Michel,
> thanks for all your hints and pieces of code.
> 
> It took me a while to play around with what I got from you (and some
> study of Vinay's module documentation.
> 
> Now I have come up with a more complete solution I'm quite satisfied
> with. And I would be very glad to receive your comments on my code
> indicating what I could do better, given that I'm still at the very
> beginning with python.

> Here is my module and a corresponding test program:

> # --- color change strings for terminal output ---
> #
> pc_yell = '\033[01;93m'
> pc_purp = '\033[01;33m'
> pc_gren = '\033[01;92m'

Hw lng wld psts + prgrms b wr it nt 4 z art of clvr + ez 2 mmrz 
abbreviations ;)

> # --- Class for all logging functionality ---
> #
> class locLogg():
>    _logger = None
> 

>    def debug_log(self, msg, *args, **kwargs):
>    def warn_log(self, msg, *args, **kwargs):
>    def error_log(self, msg, *args, **kwargs):

It should be easy to factor out most the code in your xxx_log() methods into 
a common helper. 

>    def fatal_log(self, msg, *args, **kwargs):
>      previousFrame = inspect.currentframe().f_back
>      locLogg._logger.fatal(str(level_color['fatal'])+msg+pc_norm + \
>        ' ' + argskw_2_string(*args, **kwargs),
>        extra={'custom_lineno':previousFrame.f_lineno,
>          'custom_filename': previousFrame.f_code.co_filename })

I think the formatting belongs into another layer. That's the purpose of the 
logging.Formatter class. You could enhance it along those lines:

class Formatter(logging.Formatter):
    markers = {
        logging.INFO: ("<info>", "</info>"),
        logging.WARN: ("<warn>", "</warn>"),
        }
    def format(self, record):
        message = logging.Formatter.format(self, record)
        try:
            prefix, suffix = self.markers[record.levelno]
        except KeyError:
            pass
        else:
            message = prefix + message + suffix
        return message

My general impression is that you are fighting the logging library's 
structure rather than trying to use it as effectively as possible.

>    foo.info_log('another bar info', 1,2,3, a=11, b=22, c=44)

You could achieve something similar with a standard logger by passing your 
extra information through the extra parameter, e. g:

def extra(*args, **kw):
   return dict(argskw=(args, kw))
foo.info("another...", extra=extra(1, 2, 3, a=11, b=22))

Peter


From kse.listed.co1 at gmail.com  Wed Mar 31 03:56:41 2010
From: kse.listed.co1 at gmail.com (Naeem)
Date: Wed, 31 Mar 2010 00:56:41 -0700 (PDT)
Subject: "Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL 
	JOBS IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT" 
	"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
Message-ID: <1c64f0d6-e34a-4997-b919-ba9b49b5e466@y11g2000prf.googlegroups.com>

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"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
VV


From __peter__ at web.de  Wed Mar 31 03:57:51 2010
From: __peter__ at web.de (Peter Otten)
Date: Wed, 31 Mar 2010 09:57:51 +0200
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
	<mailman.1326.1269971785.23598.python-list@python.org>
	<20100330201609.6ef12ee1@vulcan.local>
	<87sk7h8vns.fsf@castleamber.com>
	<5ef544bb-95a0-4329-80ef-f679d62b8ead@z11g2000yqz.googlegroups.com>
Message-ID: <houv8a$ed9$02$2@news.t-online.com>

Pierre Quentel wrote:

> I'm surprised nobody proposed a solution with itertools ;-)

next(itertools.takewhile(lambda _: a == b, ["yes"]), "no")

You spoke to soon :)

Peter


From clp2 at rebertia.com  Wed Mar 31 03:58:46 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 31 Mar 2010 00:58:46 -0700
Subject: Python + OpenOffice Calc
In-Reply-To: <4bb2fe14$0$1120$4fafbaef@reader3.news.tin.it>
References: <4bb2fe14$0$1120$4fafbaef@reader3.news.tin.it>
Message-ID: <j2v50697b2c1003310058m7588ea54k14ca4718bb7f3b7@mail.gmail.com>

On Wed, Mar 31, 2010 at 12:47 AM, Tracubik <affdfsdfdsfsd at b.com> wrote:
> Hi all!
> i'm giving away to a friend of mine that have a garage (he repair car) my
> old computer. He will use it essentialy to create estimates of the work
> via an ods file (i've made a simple ods file to be filled with the cost of
> materials and a description of the work).
> He's totally new with computer and have difficult to fill the ods file, so
> i'ld like to create a simple python program that help him to introduce the
> data in to the ods file via a simple gui.
> So what i'm looking for is a way in python to insert data in a particular
> cell of the ods file and possibly to save it and print it when it's full
> filled with data.
>
> the guy is similar to this:
>
> 3 fields: quantity - description of the piece bought - price
>
> a way to add a new "line" if needed (for a new piece entry) similar to the
> "add rule" in evolution
>
> 1 text field for the description of the work + 1 field for the price of
> the work
>
> and off course a way to insert this data in to the ods file via python
>
> Any hints/tutorial/info?

PyUNO: http://wiki.services.openoffice.org/wiki/PyUNO_bridge

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


From v.harishankar at gmail.com  Wed Mar 31 04:16:58 2010
From: v.harishankar at gmail.com (Harishankar)
Date: Wed, 31 Mar 2010 08:16:58 +0000 (UTC)
Subject: No editbox () functionality in python-dialog module?
Message-ID: <hov0dq$5u2$1@news.telesweet.net>

Strange issue, I find that the dialog utility has an editbox function but 
the python-dialog module doesn't provide this and there's no mention of 
the reason for the omission of this important functionality.

Is there no easy and simple way to create a multi-line input dialog in 
ANY of the text mode console libraries? :-(





-- 
Harishankar (http://harishankar.org http://literaryforums.org)


From lbolla at gmail.com  Wed Mar 31 04:18:39 2010
From: lbolla at gmail.com (lbolla)
Date: Wed, 31 Mar 2010 01:18:39 -0700 (PDT)
Subject: Sublassing tuple works, subclassing list does not
References: <mailman.1360.1270018159.23598.python-list@python.org>
Message-ID: <f8011c0b-0b1b-4a4f-94ff-304c16ef9a5b@q16g2000yqq.googlegroups.com>

On Mar 31, 7:49?am, "Frank Millman" <fr... at chagford.com> wrote:
> Hi all
>
> I needed something similar to, but not quite the same as,
> collections.namedtuple.
>
> The differences are that namedtuple requires the 'names' to be provided at
> creation time, and then lends itself to creating multiple instances of
> itself. I wanted a more generic class where I could supply the 'names' and
> 'values' at instantiation time.
>
> I came up with a simple solution that seems to work -
>
> >>> class MyTuple(tuple):
>
> ... ? def __new__(cls, names, values):
> ... ? ? for name, value in zip(names, values):
> ... ? ? ? setattr(cls, name, value)
> ... ? ? return tuple.__new__(cls, values)
> ...
>
> >>> names = ['A', 'B', 'C']
> >>> values = ['a', 'b', 'c']
>
> >>> tup = MyTuple(names, values)
>
> >>> print tup
> ('a', 'b', 'c')
>
> >>> print tup[0]
> a
>
> >>> print tup.B
> b
>
> Then I had a need to add elements after the tuple had been created. As
> tuples are immutable, I thought it would be easy to change it to a list.
> However, it does not work -
>
> >>> class MyList(list):
>
> ... ? def __new__(cls, names, values):
> ... ? ? for name, value in zip(names, values):
> ... ? ? ? setattr(cls, name, value)
> ... ? ? return list.__new__(cls, values)
> ...>>> names = ['A', 'B', 'C']
> >>> values = ['a', 'b', 'c']
>
> >>> lst = MyList(names, values)
>
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in <module>
> TypeError: list() takes at most 1 argument (2 given)
>
>
>
> I can find a workaround, but I would be interested to know the reason why it
> does not work.
>
> Version is 2.6.2.
>
> Thanks
>
> Frank Millman

When subclassing immutable types, you need to override __new__;
otherwise you need to override __init__.
Here is an in-depth explanation: http://www.python.org/download/releases/2.2/descrintro/#metaclasses

Here is some code:

class MyTuple(tuple):
	def __new__(cls, names, values):
		for name, value in zip(names, values):
			setattr(cls, name, value)
		return tuple.__new__(cls, values)

class MyList(list):
	def __init__(self, names, values):
		list.__init__(self, values)
		for name, value in zip(names, values):
			setattr(self, name, value)

names = ['A', 'B', 'C']
values = ['a', 'b', 'c']

tup = MyTuple(names, values)
print tup
print tup[0]
print tup.B

lst = MyList(names, values)
print lst
print lst[0]
print lst.B


L.


From frank at chagford.com  Wed Mar 31 04:29:17 2010
From: frank at chagford.com (Frank Millman)
Date: Wed, 31 Mar 2010 10:29:17 +0200
Subject: Sublassing tuple works, subclassing list does not
References: <mailman.1360.1270018159.23598.python-list@python.org>
	<f8011c0b-0b1b-4a4f-94ff-304c16ef9a5b@q16g2000yqq.googlegroups.com>
Message-ID: <hov14t$irf$1@dough.gmane.org>


"lbolla" <lbolla at gmail.com> wrote in message 
news:f8011c0b-0b1b-4a4f-94ff-304c16ef9a5b at q16g2000yqq.googlegroups.com...
On Mar 31, 7:49 am, "Frank Millman" <fr... at chagford.com> wrote:
>> Hi all
>>

> When subclassing immutable types, you need to override __new__;
> otherwise you need to override __init__.

Perfect. Thanks very much.

Frank




From michael.ricordeau at gmail.com  Wed Mar 31 04:29:43 2010
From: michael.ricordeau at gmail.com (Michael Ricordeau)
Date: Wed, 31 Mar 2010 10:29:43 +0200
Subject: psycopg2 / psycopg2.DataError: invalid input syntax for type
	timestamp with time zone:
In-Reply-To: <5171EFC3-09A0-4937-BDAD-C179CF1E1DFE@semanchuk.com>
References: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>
	<5171EFC3-09A0-4937-BDAD-C179CF1E1DFE@semanchuk.com>
Message-ID: <20100331102943.7f542d17@moriz.interne>

Hi

You cannot add 'NOW() - '29 days'::INTERVAL' as a query because cursor.execute() will try to mogrify it.

You can do :
  import datetime
  idays = psycopg2.extensions.adapt(datetime.timedelta(days=29))
  self.dyndb.orderdb.query('update xxxx set creation_date=(NOW() - %s) where id_order=%s', idays, "123"))

Or:
  import datetime
  interval = datetime.datetime.now() - datetime.timedelta(days=29)
  self.dyndb.orderdb.query('update xxxx set creation_date=%s where id_order=%s', (interval, "123"))
  # But in this case current date/time is not evaluated from postgresql server but only from python env ... this may cause some bugs     

You may also try to add an interval type with psycopg2.extensions.INTERVAL (I never played with it)



Le Tue, 30 Mar 2010 17:26:51 -0400,
Philip Semanchuk <philip at semanchuk.com> a ?crit :

> 
> On Mar 30, 2010, at 4:47 PM, ASh wrote:
> 
> > Hi, please help me understand why am I getting error with this query
> >
> >
> >            new_start_date = "NOW() - '29 days'::INTERVAL"
> >            self.dyndb.orderdb.query('''update xxxx set creation_date
> > = %s
> >            where id_order = %s''', (new_start_date, "123"))
> >
> >
> >
> > ...
> > psycopg2.DataError: invalid input syntax for type timestamp with time
> > zone: "NOW() - '29 days'::INTERVAL"
> 
> Hi Anton,
> It sounds to me like the problem is with your SQL rather than with  
> psycopg2 or Python. Try the query directly in Postgres -- does it work  
> there? If so, then your next step should be to ask on the psycopg2  
> mailing list that Google can find for you.
> 
> Good luck
> Philip
> 


From richard.lamboj at bilcom.at  Wed Mar 31 04:36:32 2010
From: richard.lamboj at bilcom.at (Richard Lamboj)
Date: Wed, 31 Mar 2010 10:36:32 +0200
Subject: libpst - python bindings
Message-ID: <201003311036.32554.richard.lamboj@bilcom.at>


Hello,

are there any python bindings for libpst?

http://www.five-ten-sg.com/libpst/
https://alioth.debian.org/projects/libpst/

Kind Regards

Richi


From anton.shishkov at gmail.com  Wed Mar 31 04:42:41 2010
From: anton.shishkov at gmail.com (Anton Shishkov)
Date: Wed, 31 Mar 2010 01:42:41 -0700 (PDT)
Subject: psycopg2 / psycopg2.DataError: invalid input syntax for type 
	timestamp with time zone:
References: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>
	<mailman.1336.1269985882.23598.python-list@python.org>
	<e9994806-5a52-4b9a-a4fe-66cf6625e3c9@l25g2000yqd.googlegroups.com>
	<mailman.1349.1269994259.23598.python-list@python.org>
Message-ID: <f4c24dde-6d96-49a7-a805-036e090249fc@z35g2000yqd.googlegroups.com>

On Mar 31, 3:10?am, "D'Arcy J.M. Cain" <da... at druid.net> wrote:
> On Tue, 30 Mar 2010 15:46:12 -0700 (PDT)
>
> ASh <anton.shish... at gmail.com> wrote:
> > > > ? ? ? ? ? ? new_start_date = "NOW() - '29 days'::INTERVAL"
> > > > ? ? ? ? ? ? self.dyndb.orderdb.query('''update xxxx set creation_date
> > > > = %s
> > > > ? ? ? ? ? ? where id_order = %s''', (new_start_date, "123"))
>
> > > Put single quotes around the first %s in the query.
>
> > Tried like you said, got this error:
>
> > psycopg2.ProgrammingError: syntax error at or near "NOW"
> > LINE 1: update orderdb.orders set creation_date = 'E'NOW() - ''29
> > da...
>
> Right. ?I misread it. ?Please show us the exact error that you get with
> the original code.
>
> --
> D'Arcy J.M. Cain <da... at druid.net> ? ? ? ? | ?Democracy is three wolveshttp://www.druid.net/darcy/? ? ? ? ? ? ? ?| ?and a sheep voting on
> +1 416 425 1212 ? ? (DoD#0082) ? ?(eNTP) ? | ?what's for dinner.

Error:
    cursor.execute(sql, params)
  File "/opt/local/lib/python2.5/site-packages/psycopg2/extras.py",
line 118, in execute
    return _cursor.execute(self, query, vars, async)
psycopg2.ProgrammingError: syntax error at or near "NOW"
LINE 1: update orderdb.orders set creation_date = 'E'NOW() - ''29
da...
                                                     ^


From bruno.42.desthuilliers at websiteburo.invalid  Wed Mar 31 04:58:53 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 31 Mar 2010 10:58:53 +0200
Subject: Sublassing tuple works, subclassing list does not
In-Reply-To: <f8011c0b-0b1b-4a4f-94ff-304c16ef9a5b@q16g2000yqq.googlegroups.com>
References: <mailman.1360.1270018159.23598.python-list@python.org>
	<f8011c0b-0b1b-4a4f-94ff-304c16ef9a5b@q16g2000yqq.googlegroups.com>
Message-ID: <4bb30e95$0$17814$426a74cc@news.free.fr>

lbolla a ?crit :
> 
> class MyList(list):
> 	def __init__(self, names, values):
> 		list.__init__(self, values)
> 		for name, value in zip(names, values):
> 			setattr(self, name, value)
> 
> names = ['A', 'B', 'C']
> values = ['a', 'b', 'c']
> 
> lst = MyList(names, values)
> print lst
> print lst[0]
> print lst.B
> 

 >>> lst[0] = "foobar"
 >>> lst.A
'a'>>> lst.B = 42
 >>> lst[1]
'b'
 >>> lst.D="duh"
 >>> lst[3]
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
IndexError: list index out of range



From rtw at rtw.me.uk  Wed Mar 31 05:02:27 2010
From: rtw at rtw.me.uk (Rob Williscroft)
Date: Wed, 31 Mar 2010 04:02:27 -0500
Subject: Sublassing tuple works, subclassing list does not
References: <mailman.1360.1270018159.23598.python-list@python.org>
Message-ID: <Xns9D4C66A7FA9BrtwfreenetREMOVEcouk@216.196.109.145>

Frank Millman wrote in news:mailman.1360.1270018159.23598.python-
list at python.org in comp.lang.python:

> I came up with a simple solution that seems to work -
> 
>>>> class MyTuple(tuple):
> ...   def __new__(cls, names, values):
> ...     for name, value in zip(names, values):
> ...       setattr(cls, name, value)
> ...     return tuple.__new__(cls, values)
> ...
>>>> names = ['A', 'B', 'C']
>>>> values = ['a', 'b', 'c']
>>>>
>>>> tup = MyTuple(names, values)
>>>>

Are you aware you are adding attributes to the class here, IOW:

    	MyTuple.C == 'c'

If you want to add attibutes to the instance:

class MyTuple(tuple):
  def __new__(cls, names, values):
    r =  tuple.__new__(cls, values)
    for name, value in zip(names, values):
      setattr(r, name, value)
    return r

names = ['A', 'B', 'C']
values = ['a', 'b', 'c']

tup = MyTuple(names, values)

assert tup[0] == 'a'
assert tup.B == 'b'

try:
  MyTuple.C
except AttributeError:
  pass
else:
  assert False





From pavlovevidence at gmail.com  Wed Mar 31 05:38:33 2010
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 31 Mar 2010 02:38:33 -0700 (PDT)
Subject: Sublassing tuple works, subclassing list does not
References: <mailman.1360.1270018159.23598.python-list@python.org> 
	<Xns9D4C66A7FA9BrtwfreenetREMOVEcouk@216.196.109.145>
Message-ID: <2baf58a8-b5f1-4db0-9dff-260c62f1641f@h4g2000pre.googlegroups.com>

On Mar 31, 2:02?am, Rob Williscroft <r... at rtw.me.uk> wrote:
> Frank Millman wrote in news:mailman.1360.1270018159.23598.python-
> l... at python.org in comp.lang.python:
>
> > I came up with a simple solution that seems to work -
>
> >>>> class MyTuple(tuple):
> > ... ? def __new__(cls, names, values):
> > ... ? ? for name, value in zip(names, values):
> > ... ? ? ? setattr(cls, name, value)
> > ... ? ? return tuple.__new__(cls, values)
> > ...
> >>>> names = ['A', 'B', 'C']
> >>>> values = ['a', 'b', 'c']
>
> >>>> tup = MyTuple(names, values)
>
> Are you aware you are adding attributes to the class here, IOW:
>
> ? ? ? ? MyTuple.C == 'c'



> If you want to add attibutes to the instance:
>
> class MyTuple(tuple):
> ? def __new__(cls, names, values):
> ? ? r = ?tuple.__new__(cls, values)
> ? ? for name, value in zip(names, values):
> ? ? ? setattr(r, name, value)
> ? ? return r
>
> names = ['A', 'B', 'C']
> values = ['a', 'b', 'c']
>
> tup = MyTuple(names, values)
>
> assert tup[0] == 'a'
> assert tup.B == 'b'
>
> try:
> ? MyTuple.C
> except AttributeError:
> ? pass
> else:
> ? assert False

Careful, this adds the new attributes as to the object's __dict__, not
to the tuple item slots.  Which works ok if you don't care if that
someone can mutate the attributes, and if they do the attributes no
longer match the items.  Personally I do mind.

tup = MyTuple(names,values)
assert tup.A == 'a'
assert tup[0] == 'a'
tup.A = 'd'    # doesn't fail but should
assert tup.A == 'd'
assert tup[0] == 'd'   # fails but, granted you allow mutabilty,
shouldn't



The best way to do what the OP wanted (originally) is this, no
subclassing necessary:

def my_named_tuple(names,values):
    return namedtuple('ad_hoc_named_tuple',names)(*values)


As for the OP's second problem, to append named items, I'd first
consider whether I'm thinking about the problem correctly, and if so,
go with a subclass of list and overriding __getattr__.  Probably one
of the rare cases I would override __getattr__ other than a proxy
class.


Carl Banks


From mark.dufour at gmail.com  Wed Mar 31 05:50:42 2010
From: mark.dufour at gmail.com (Mark Dufour)
Date: Wed, 31 Mar 2010 11:50:42 +0200
Subject: ANN: Shed Skin 0.4
Message-ID: <g2x8180ef691003310250g2c32722bvf9b21105848afc8a@mail.gmail.com>

Hi all,

I have just released Shed Skin 0.4, an experimental (restricted) Python-to-C++
compiler. Please see my blog for more details about the release:

http://shed-skin.blogspot.com/


Thanks,
Mark Dufour.
-- 
"Overdesigning is a SIN. It's the archetypal example of what I call 'bad
taste'" - Linus Torvalds
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From chris at simplistix.co.uk  Wed Mar 31 06:39:30 2010
From: chris at simplistix.co.uk (Chris Withers)
Date: Wed, 31 Mar 2010 11:39:30 +0100
Subject: PyDispatcher on sourceforge doesn't play nice with easy_install
In-Reply-To: <4BB21F18.2010705@vrplumber.com>
References: <4BB1B034.9020905@simplistix.co.uk>
	<4BB21F18.2010705@vrplumber.com>
Message-ID: <4BB32662.9080702@simplistix.co.uk>

Mike C. Fletcher wrote:
> Chris Withers wrote:
>> Hi All,
>>
>> Using easy_install to get PyDispatcher results in:
>>
> ...
>> Who's the maintainer of PyDispatcher nowadays? Would be handy if they
>> removed the sourceforge link from pypi.
> ...
> 
> Thanks for the report.  I've released a 2.0.2 version on PyPI.  That
> should now work properly with easy_install.

Great! Thanks Mike!

Chris

-- 
Simplistix - Content Management, Batch Processing & Python Consulting
             - http://www.simplistix.co.uk


From iwanttobeabadger at googlemail.com  Wed Mar 31 06:49:14 2010
From: iwanttobeabadger at googlemail.com (Nathan Harmston)
Date: Wed, 31 Mar 2010 11:49:14 +0100
Subject: Generating text from a regular expression
Message-ID: <w2gb32951aa1003310349l8938653fw7cd92b848701c9ac@mail.gmail.com>

Hi everyone,

I have a slightly complicated/medium sized regular expression and I
want to generate all possible words that it can match (to compare
performance of regex against an acora based matcher). Using the
regular expression as a grammar to generate all words in its language.
I was wondering if this possible in Python or possible using anything.
Google doesnt seem to give any obvious answers.

Many thanks in advance,

Nathan


From anton.shishkov at gmail.com  Wed Mar 31 06:50:39 2010
From: anton.shishkov at gmail.com (Anton Shishkov)
Date: Wed, 31 Mar 2010 03:50:39 -0700 (PDT)
Subject: psycopg2 / psycopg2.DataError: invalid input syntax for type 
	timestamp with time zone:
References: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>
	<5171EFC3-09A0-4937-BDAD-C179CF1E1DFE@semanchuk.com>
	<mailman.1367.1270024188.23598.python-list@python.org>
Message-ID: <f1ec217b-90fc-461d-9f52-4b98329c8007@z4g2000yqa.googlegroups.com>

On Mar 31, 11:29?am, Michael Ricordeau <michael.ricord... at gmail.com>
wrote:
> Hi
>
> You cannot add 'NOW() - '29 days'::INTERVAL' as a query because cursor.execute() will try to mogrify it.
>
> You can do :
> ? import datetime
> ? idays = psycopg2.extensions.adapt(datetime.timedelta(days=29))
> ? self.dyndb.orderdb.query('update xxxx set creation_date=(NOW() - %s) where id_order=%s', idays, "123"))
>
> Or:
> ? import datetime
> ? interval = datetime.datetime.now() - datetime.timedelta(days=29)
> ? self.dyndb.orderdb.query('update xxxx set creation_date=%s where id_order=%s', (interval, "123"))
> ? # But in this case current date/time is not evaluated from postgresql server but only from python env ... this may cause some bugs ? ?
>
> You may also try to add an interval type with psycopg2.extensions.INTERVAL (I never played with it)
>
> Le Tue, 30 Mar 2010 17:26:51 -0400,
> Philip Semanchuk <phi... at semanchuk.com> a ?crit :
>
>
>
>
>
> > On Mar 30, 2010, at 4:47 PM, ASh wrote:
>
> > > Hi, please help me understand why am I getting error with this query
>
> > > ? ? ? ? ? ?new_start_date = "NOW() - '29 days'::INTERVAL"
> > > ? ? ? ? ? ?self.dyndb.orderdb.query('''update xxxx set creation_date
> > > = %s
> > > ? ? ? ? ? ?where id_order = %s''', (new_start_date, "123"))
>
> > > ...
> > > psycopg2.DataError: invalid input syntax for type timestamp with time
> > > zone: "NOW() - '29 days'::INTERVAL"
>
> > Hi Anton,
> > It sounds to me like the problem is with your SQL rather than with ?
> > psycopg2 or Python. Try the query directly in Postgres -- does it work ?
> > there? If so, then your next step should be to ask on the psycopg2 ?
> > mailing list that Google can find for you.
>
> > Good luck
> > Philip

thank you for good examples (bow)


From hniksic at xemacs.org  Wed Mar 31 07:07:55 2010
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Wed, 31 Mar 2010 13:07:55 +0200
Subject: Sublassing tuple works, subclassing list does not
References: <mailman.1360.1270018159.23598.python-list@python.org>
Message-ID: <87iq8czr3o.fsf@busola.homelinux.net>

"Frank Millman" <frank at chagford.com> writes:

>>>> class MyList(list):
> ...   def __new__(cls, names, values):
> ...     for name, value in zip(names, values):
> ...       setattr(cls, name, value)
> ...     return list.__new__(cls, values)

Did you really mean to setattr the class here?  If I'm guessing
your intentions correctly, it should be:

        def __new__(cls, names, values):
          self = list.__new__(cls, values)
          for name, value in zip(names, values):
            setattr(self, name, value)
          return self

> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
> TypeError: list() takes at most 1 argument (2 given)
>>>>
>
> I can find a workaround, but I would be interested to know the reason
> why it does not work.

Because you didn't define __init__, so MyList inherited the one from
list, and it has a different signature to what you're calling it with.
Simply add an __init__ with the proper signature, and the proper upcall
to list.__init__:

   def __init__(self, names, values):
       list.__init__(self, values)

But if you're doing that, you don't need __new__ at all.  Simply
override __init__ and place your setattr loop there:

>>> class MyList(list):
...    def __init__(self, names, values):
...      for name, value in zip(names, values):
...        setattr(self, name, value)
...      list.__init__(self, values)
...
>>> MyList(['a'], [1])
[1]
>>> _.a
1


From frank at chagford.com  Wed Mar 31 07:51:05 2010
From: frank at chagford.com (Frank Millman)
Date: Wed, 31 Mar 2010 13:51:05 +0200
Subject: Sublassing tuple works, subclassing list does not
References: <hour90$vlc$1@dough.gmane.org>
Message-ID: <hovcva$t3a$1@dough.gmane.org>

On Mar 31, 8:49 am, "Frank Millman" <fr... at chagford.com> wrote:
> Hi all

Thanks to all for the helpful replies.

Rob, you are correct, I had not realised I was adding attributes to the 
class instead of the instance. Your alternative does work correctly. Thanks.

Carl, I understand your concern about modifying attributes. In my particular 
case, this is not a problem, as the class is under my control, and an 
instance will not be modified once it is set up, but I agree one must be 
careful not to mis-use it.

My use-case is that I want to create a number of objects, I want to store 
them in a tuple/list so that I can retrieve them sequentially, and I also 
want to retrieve them individually by name. Normally I would create a tuple 
and a dictionary to serve the two purposes, but I thought this might be a 
convenient way to get both behaviours from the same structure.

Regarding adding elements after instantiation, I would subclass 'list', as 
suggested by others, and then add an 'add' method, like this -

    def add(self, name, value):
        setattr(self, name, value)
        self.append(value)

I tested this and it behaves as I want.

Having said all of this, I have realised that what I probably want is an 
ordered dict. I will play with the one in PyPi, hopefully it will render 
this entire discussion redundant. It was interesting, though, and I have 
learned a lot.

Thanks again

Frank




From gagsl-py2 at yahoo.com.ar  Wed Mar 31 07:58:03 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 31 Mar 2010 08:58:03 -0300
Subject: Generating text from a regular expression
References: <w2gb32951aa1003310349l8938653fw7cd92b848701c9ac@mail.gmail.com>
Message-ID: <op.vafku1xrx6zn5v@lepton.softlabbsas.com.ar>

En Wed, 31 Mar 2010 07:49:14 -0300, Nathan Harmston  
<iwanttobeabadger at googlemail.com> escribi?:

> I have a slightly complicated/medium sized regular expression and I
> want to generate all possible words that it can match (to compare
> performance of regex against an acora based matcher). Using the
> regular expression as a grammar to generate all words in its language.
> I was wondering if this possible in Python or possible using anything.
> Google doesnt seem to give any obvious answers.

I've done this some time ago.
This recipe  
http://code.activestate.com/recipes/577041-merge-multiple-potentially-infinite-sorted-inputs-/
provides an infinite merge operation, required for effectively enumerating  
a regular language (with shorter strings first, else 'a*b' would get stuck  
repeating "a"s and never yielding any "b").
The example at the end shows the basics of how to use it (by hand) in a  
very simple case.
To enumerate all strings matching '(a|bc)*' one should invoke  
closure(product(['a'],['b','c'])), which gives:

'', 'a', 'aa', 'bc',
'aaa', 'abc', 'bca',
'aaaa', 'aabc', 'abca', 'bcaa', 'bcbc',
'aaaaa', 'aaabc', 'aabca', 'abcaa', 'abcbc', 'bcaaa', 'bcabc', 'bcbca',
...

Converting the former expression into the later function calls requires a  
parser (not shown -- and I won't be able to find it until Friday)

-- 
Gabriel Genellina



From python.list at tim.thechases.com  Wed Mar 31 08:01:57 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 31 Mar 2010 07:01:57 -0500
Subject: Generating text from a regular expression
In-Reply-To: <w2gb32951aa1003310349l8938653fw7cd92b848701c9ac@mail.gmail.com>
References: <w2gb32951aa1003310349l8938653fw7cd92b848701c9ac@mail.gmail.com>
Message-ID: <4BB339B5.3050505@tim.thechases.com>

Nathan Harmston wrote:
> I have a slightly complicated/medium sized regular expression
> and I want to generate all possible words that it can match
> (to compare performance of regex against an acora based
> matcher). Using the regular expression as a grammar to
> generate all words in its language. I was wondering if this
> possible in Python or possible using anything. Google doesnt
> seem to give any obvious answers.

Unless you limit your regexp to bounded regular expressions (you 
don't use the "*", "+" and unbounded-top-end "{...}" tokens), it 
has an infinite number of possible words that can match.  As a 
simple example, the regexp "a*" matches "" (the empty string), 
"a", "aa", "aaa", "aaaa"...and so on up to the limit of a string 
length.

There was a discussion on this a while back:

http://mail.python.org/pipermail/python-list/2010-February/1235120.html

so you might chat with the person who started that thread.  You 
basically have to write a regexp parser that generates code to 
generate the expressions, and even simple expressions such as 
"[a-z]{1,30}" can create an astronomical number of possible inputs.

-tkc





From piet at vanoostrum.org  Wed Mar 31 08:50:51 2010
From: piet at vanoostrum.org (Piet van Oostrum)
Date: Wed, 31 Mar 2010 14:50:51 +0200
Subject: os.walk restart
References: <a8c1c0df-cbfa-421c-a869-9f4c555a80ac@l11g2000pro.googlegroups.com>
Message-ID: <m239zg64es.fsf@cochabamba.vanoostrum.org>

You have no guarantee that on the next run the directories will be
visited in the same order as in the first run (this could depend on the
filesystem). So then remembering a last directory won't do it. You could
write each completed directory name to a file, and then on the second
run check whether a directory is in that list and skip the program run
for these.

Something like this (symbolically):

lastrun = map(string.strip, logfile.readlines())
newlog = ... open logfile in append mode ...

for root, dirs, files in os.walk(basedir):
    if root not in lastrun:
        run program
        newlog.write(root)
        newlog.flush()

-- 
Piet van Oostrum <piet at vanoostrum.org>
WWW: http://pietvanoostrum.com/
PGP key: [8DAE142BE17999C4]
Nu Fair Trade woonwaar op http://www.zylja.com


From jura.grozni at gmail.com  Wed Mar 31 09:01:34 2010
From: jura.grozni at gmail.com (azrael)
Date: Wed, 31 Mar 2010 06:01:34 -0700 (PDT)
Subject: wrapping data from groups
Message-ID: <2c51a367-73b3-4639-b8bf-fa6b6db90be2@b30g2000yqd.googlegroups.com>

Hi

Could anyone give me a hint about a problem I have. I want to wrap
data from  newsgroups like comp.lang.python. Is there anywhere out
some module for this or does google has something for this.


From jeanmichel at sequans.com  Wed Mar 31 09:02:16 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Wed, 31 Mar 2010 15:02:16 +0200
Subject: libpst - python bindings
In-Reply-To: <201003311036.32554.richard.lamboj@bilcom.at>
References: <201003311036.32554.richard.lamboj@bilcom.at>
Message-ID: <4BB347D8.7050202@sequans.com>

Richard Lamboj wrote:
> Hello,
>
> are there any python bindings for libpst?
>
> http://www.five-ten-sg.com/libpst/
> https://alioth.debian.org/projects/libpst/
>
> Kind Regards
>
> Richi
>   
http://www.lmgtfy.com/?q=libpst+python

3rd hit

Cheers,

JM


From steve at holdenweb.com  Wed Mar 31 09:28:32 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 31 Mar 2010 09:28:32 -0400
Subject: wrapping data from groups
In-Reply-To: <2c51a367-73b3-4639-b8bf-fa6b6db90be2@b30g2000yqd.googlegroups.com>
References: <2c51a367-73b3-4639-b8bf-fa6b6db90be2@b30g2000yqd.googlegroups.com>
Message-ID: <hovim3$i34$1@dough.gmane.org>

azrael wrote:
> Hi
> 
> Could anyone give me a hint about a problem I have. I want to wrap
> data from  newsgroups like comp.lang.python. Is there anywhere out
> some module for this or does google has something for this.

nntplib would be the normal starting point. I've used it, and it works
reasonably well.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From invalid at invalid.invalid  Wed Mar 31 10:13:32 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Wed, 31 Mar 2010 14:13:32 +0000 (UTC)
Subject: Generating text from a regular expression
References: <mailman.1371.1270032563.23598.python-list@python.org>
Message-ID: <hovlac$o7v$1@reader1.panix.com>

On 2010-03-31, Nathan Harmston <iwanttobeabadger at googlemail.com> wrote:

> I have a slightly complicated/medium sized regular expression and I
> want to generate all possible words that it can match
>
> I was wondering if this possible in Python or possible using
> anything. Google doesnt seem to give any obvious answers.

We did this one a couple weeks ago.

It's not possible in the general case (there are an infinite number of
matching words for many/most regular expressions).

-- 
Grant Edwards               grant.b.edwards        Yow! ... the MYSTERIANS are
                                  at               in here with my CORDUROY
                              gmail.com            SOAP DISH!!


From ptmcg at austin.rr.com  Wed Mar 31 11:23:48 2010
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Wed, 31 Mar 2010 08:23:48 -0700 (PDT)
Subject: Generating text from a regular expression
References: <mailman.1371.1270032563.23598.python-list@python.org>
Message-ID: <829a8515-0c35-449e-abb9-2321092f2598@l25g2000yqd.googlegroups.com>

On Mar 31, 5:49?am, Nathan Harmston <iwanttobeabad... at googlemail.com>
wrote:
> Hi everyone,
>
> I have a slightly complicated/medium sized regular expression and I
> want to generate all possible words that it can match (to compare
> performance of regex against an acora based matcher).

The pyparsing wiki Examples page includes this regex inverter:
http://pyparsing.wikispaces.com/file/view/invRegex.py

>From the module header:
# Supports:
# - {n} and {m,n} repetition, but not unbounded + or * repetition
# - ? optional elements
# - [] character ranges
# - () grouping
# - | alternation

-- Paul


From jmontoyaz at gmail.com  Wed Mar 31 12:40:30 2010
From: jmontoyaz at gmail.com (Javier Montoya)
Date: Wed, 31 Mar 2010 09:40:30 -0700 (PDT)
Subject: associative array
Message-ID: <ede55ee3-ac4a-47ad-842a-6ad2caa351d6@r18g2000yqd.googlegroups.com>

Dear all,

I'm a newbie in python and would be acknowledge if somebody could shed
some light on associative arrays.
More precisely, I would like to create a multi-dimensional associative
array. I have for example a list of students which are identified
uniquely by their student IDs. Additionally, for each student I have
some information: FirstName, LastName, etc.

The array would have then the following form:
[StudentID] => [FirstName][LastName][Telephone]...[ ... ]

I would like to be able to access a field directly by using a
StudentID
[StudentID][FirstName]
[StudentID][LastName]

How could I manipulate such an array (create the array, add elements,
access data)?

Best wishes




From kushal.kumaran+python at gmail.com  Wed Mar 31 12:52:14 2010
From: kushal.kumaran+python at gmail.com (Kushal Kumaran)
Date: Wed, 31 Mar 2010 22:22:14 +0530
Subject: associative array
In-Reply-To: <ede55ee3-ac4a-47ad-842a-6ad2caa351d6@r18g2000yqd.googlegroups.com>
References: <ede55ee3-ac4a-47ad-842a-6ad2caa351d6@r18g2000yqd.googlegroups.com>
Message-ID: <z2j1e364c4e1003310952y671b6a23jcca3241ac22c1356@mail.gmail.com>

On Wed, Mar 31, 2010 at 10:10 PM, Javier Montoya <jmontoyaz at gmail.com> wrote:
> Dear all,
>
> I'm a newbie in python and would be acknowledge if somebody could shed
> some light on associative arrays.
> More precisely, I would like to create a multi-dimensional associative
> array. I have for example a list of students which are identified
> uniquely by their student IDs. Additionally, for each student I have
> some information: FirstName, LastName, etc.
>
> The array would have then the following form:
> [StudentID] => [FirstName][LastName][Telephone]...[ ... ]
>
> I would like to be able to access a field directly by using a
> StudentID
> [StudentID][FirstName]
> [StudentID][LastName]
>
> How could I manipulate such an array (create the array, add elements,
> access data)?
>

Did you try the python tutorial?  Dictionaries might be what you are
looking for.

http://docs.python.org/tutorial/datastructures.html#dictionaries

-- 
regards,
kushal


From jura.grozni at gmail.com  Wed Mar 31 12:58:40 2010
From: jura.grozni at gmail.com (azrael)
Date: Wed, 31 Mar 2010 09:58:40 -0700 (PDT)
Subject: wrapping data from groups
References: <2c51a367-73b3-4639-b8bf-fa6b6db90be2@b30g2000yqd.googlegroups.com>
	<mailman.1376.1270042130.23598.python-list@python.org>
Message-ID: <d01bc7f6-c256-4678-a79b-00c98bf47794@30g2000yqi.googlegroups.com>

I tried to use some servers I know but they have a limited amount of
stored threads. not like google that has every thread ever opened. so
I tried to wrap google's html but I get a 403 error. any sugesstions?





On Mar 31, 3:28?pm, Steve Holden <st... at holdenweb.com> wrote:
> azrael wrote:
> > Hi
>
> > Could anyone give me a hint about a problem I have. I want to wrap





> > data from ?newsgroups like comp.lang.python. Is there anywhere out
> > some module for this or does google has something for this.
>
> nntplib would be the normal starting point. I've used it, and it works
> reasonably well.
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ? ? +1 571 484 6266 ? +1 800 494 3119
> See PyCon Talks from Atlanta 2010 ?http://pycon.blip.tv/
> Holden Web LLC ? ? ? ? ? ? ? ?http://www.holdenweb.com/
> UPCOMING EVENTS: ? ? ? ?http://holdenweb.eventbrite.com/



From ccurvey at gmail.com  Wed Mar 31 13:08:50 2010
From: ccurvey at gmail.com (Chris Curvey)
Date: Wed, 31 Mar 2010 10:08:50 -0700 (PDT)
Subject: sorting ascending/descending with operator.attrgetter
Message-ID: <a8c7b02e-73d8-4ae2-a76a-e54a01bd22f5@b30g2000yqd.googlegroups.com>

I must be having a brain cramp.  Given a list of objects, how can I
sort the list on one attribute in descending order, then sort within
each group in ascending order on another attribute.

For example:

class Foo:
    def __init__(self, a, b, c):
        self.a = a
        self.b = b
        self.c = c


I can do "allmyfoos.sort(operator.attrgetter('a','b'))" to sort
ascending on both attributes, but how could i sort by "a, descending,
then b, ascending)?"





From tomf.sessile at gmail.com  Wed Mar 31 13:21:36 2010
From: tomf.sessile at gmail.com (TomF)
Date: Wed, 31 Mar 2010 10:21:36 -0700
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
	<mailman.1326.1269971785.23598.python-list@python.org>
	<20100330201609.6ef12ee1@vulcan.local>
	<87sk7h8vns.fsf@castleamber.com>
	<5ef544bb-95a0-4329-80ef-f679d62b8ead@z11g2000yqz.googlegroups.com>
	<houv8a$ed9$02$2@news.t-online.com>
Message-ID: <2010033110213616807-tomfsessile@gmailcom>

On 2010-03-31 00:57:51 -0700, Peter Otten <__peter__ at web.de> said:
> Pierre Quentel wrote:
> 
>> I'm surprised nobody proposed a solution with itertools ;-)
> 
> next(itertools.takewhile(lambda _: a == b, ["yes"]), "no")
> 
> You spoke to soon :)

I salute you, sir, for upholding the standards of this group.

-Tom



From safoo.alahmadi at gmail.com  Wed Mar 31 13:30:39 2010
From: safoo.alahmadi at gmail.com (safwan alahmadi)
Date: Wed, 31 Mar 2010 10:30:39 -0700 (PDT)
Subject: Video is very funny..hhhhhhhhhhhh
Message-ID: <9ba61e22-bcca-4684-a5d6-1fd587641525@8g2000yqz.googlegroups.com>



hhhhhhhhhhhh

Video is very funny

http://www.youtube.com/watch?v=-cKvPp71QFY


From mail at timgolden.me.uk  Wed Mar 31 13:35:00 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 31 Mar 2010 18:35:00 +0100
Subject: sorting ascending/descending with operator.attrgetter
In-Reply-To: <a8c7b02e-73d8-4ae2-a76a-e54a01bd22f5@b30g2000yqd.googlegroups.com>
References: <a8c7b02e-73d8-4ae2-a76a-e54a01bd22f5@b30g2000yqd.googlegroups.com>
Message-ID: <4BB387C4.5010002@timgolden.me.uk>

On 31/03/2010 18:08, Chris Curvey wrote:
> I must be having a brain cramp.  Given a list of objects, how can I
> sort the list on one attribute in descending order, then sort within
> each group in ascending order on another attribute.
>
> For example:
>
> class Foo:
>      def __init__(self, a, b, c):
>          self.a = a
>          self.b = b
>          self.c = c

I think this is the kind of thing you're after...

http://ramblings.timgolden.me.uk/2009/10/15/reverse-sorting-on-arbitrary-key-segments/

... at least the link to the Wiki should help:

http://wiki.python.org/moin/HowTo/Sorting

TJG


From gherron at digipen.edu  Wed Mar 31 13:36:22 2010
From: gherron at digipen.edu (Gary Herron)
Date: Wed, 31 Mar 2010 10:36:22 -0700
Subject: associative array
In-Reply-To: <ede55ee3-ac4a-47ad-842a-6ad2caa351d6@r18g2000yqd.googlegroups.com>
References: <ede55ee3-ac4a-47ad-842a-6ad2caa351d6@r18g2000yqd.googlegroups.com>
Message-ID: <4BB38816.4030305@digipen.edu>

Javier Montoya wrote:
> Dear all,
>
> I'm a newbie in python and would be acknowledge if somebody could shed
> some light on associative arrays.
> More precisely, I would like to create a multi-dimensional associative
> array. I have for example a list of students which are identified
> uniquely by their student IDs. Additionally, for each student I have
> some information: FirstName, LastName, etc.
>
> The array would have then the following form:
> [StudentID] => [FirstName][LastName][Telephone]...[ ... ]
>
> I would like to be able to access a field directly by using a
> StudentID
> [StudentID][FirstName]
> [StudentID][LastName]
>
> How could I manipulate such an array (create the array, add elements,
> access data)?
>
> Best wishes
>
>
>   
Create a class for student with attributes for ID, FirstName, LastName, etc.

  class Student:
      def __init__(self, id, FirstName, ...):
          self.id = id
          self.FirstName = FirstName
          ...

then whenever you create a student object, use a dictionary to associate 
the object with its is
  AA = {} # An empty dictionary
  s = Student(...)
  AA[s.id] = s
  ... and repeat for many students...

Then to access a student's object given an id:
  s = AA[id]
  print s.id, s.FirstName, s.LastName, ...


I'd *not* call this a multi-dimension association, but rather just an 
association between student objects and their ids.

Hope that helps,

Gary Herron

-- 
Gary Herron, PhD.
Department of Computer Science
DigiPen Institute of Technology
(425) 895-4418




From __peter__ at web.de  Wed Mar 31 13:49:08 2010
From: __peter__ at web.de (Peter Otten)
Date: Wed, 31 Mar 2010 19:49:08 +0200
Subject: sorting ascending/descending with operator.attrgetter
References: <a8c7b02e-73d8-4ae2-a76a-e54a01bd22f5@b30g2000yqd.googlegroups.com>
Message-ID: <hp01su$ma6$02$1@news.t-online.com>

Chris Curvey wrote:

> I must be having a brain cramp.  Given a list of objects, how can I
> sort the list on one attribute in descending order, then sort within
> each group in ascending order on another attribute.
> 
> For example:
> 
> class Foo:
>     def __init__(self, a, b, c):
>         self.a = a
>         self.b = b
>         self.c = c
> 
> 
> I can do "allmyfoos.sort(operator.attrgetter('a','b'))" to sort
> ascending on both attributes, but how could i sort by "a, descending,
> then b, ascending)?"

In the general case you have to sort twice:

>>> from collections import namedtuple
>>> Foo = namedtuple("Foo", "a b")
>>> items = [Foo(x, y) for x in range(3) for y in range(3)]
>>> def show(items):
...     for item in items: print item
...
>>> show(items)
Foo(a=0, b=0)
Foo(a=0, b=1)
Foo(a=0, b=2)
Foo(a=1, b=0)
Foo(a=1, b=1)
Foo(a=1, b=2)
Foo(a=2, b=0)
Foo(a=2, b=1)
Foo(a=2, b=2)
>>> from operator import attrgetter
>>> items.sort(key=attrgetter("b"))
>>> items.sort(key=attrgetter("a"), reverse=True)
>>> show(items)
Foo(a=2, b=0)
Foo(a=2, b=1)
Foo(a=2, b=2)
Foo(a=1, b=0)
Foo(a=1, b=1)
Foo(a=1, b=2)
Foo(a=0, b=0)
Foo(a=0, b=1)
Foo(a=0, b=2)

This is guaranteed to work because list.sort() is "stable", i. e. it doesn't 
alter the order of items with equal keys.

Peter


From nathan.alexander.rice at gmail.com  Wed Mar 31 13:58:58 2010
From: nathan.alexander.rice at gmail.com (Nathan Rice)
Date: Wed, 31 Mar 2010 13:58:58 -0400
Subject: Question about list comprehension/standard "for" disparities
Message-ID: <y2s3e2a7ec1003311058p13c387d9r1cc31949fbf6817b@mail.gmail.com>

I was just wondering, why the list/generator and standard "for" have
disparities?

It would be really nice to be able to do:

for x in y if foo:
    ...

rather than:

for x in (x for x in y if foo):
    ...

Also, from a style standpoint, I prefer to extract the loop logic into a
function if it's more than a few lines long.  As a result, most of my loops
are of the form:

for x in y:
    bar(x)

So I frequently end up using map.  As I understand it, there is some
discussion of removing map() in favor of comprehensions.  Is there any
reason why the for syntax could not be expanded to accommodate statements of
the form:

bar(x) for x in y

?

This inconsistency really bothered me when I started playing with python,
and it seems kind of at-odds with the "one right way to do things"
mentality.

-Nathan
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From wescpy at gmail.com  Wed Mar 31 14:01:58 2010
From: wescpy at gmail.com (wesley chun)
Date: Wed, 31 Mar 2010 11:01:58 -0700
Subject: ANN: Intro+Intermediate Python course, SF, May 10-12
Message-ID: <z2m78b3a9581003311101ga24ddd63ze42bd4608bfaa137@mail.gmail.com>

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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
"Core Python Programming", Prentice Hall, (c)2007,2001
"Python Fundamentals", Prentice Hall, (c)2009
    http://corepython.com

wesley.j.chun :: wescpy-at-gmail.com
python training and technical consulting
cyberweb.consulting : silicon valley, ca
http://cyberwebconsulting.com


From nagle at animats.com  Wed Mar 31 14:05:58 2010
From: nagle at animats.com (John Nagle)
Date: Wed, 31 Mar 2010 11:05:58 -0700
Subject: "Usability, the Soul of Python"
In-Reply-To: <hosnrh$6na$1@news.eternal-september.org>
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>	<4bb14173$0$1640$742ec2ed@news.sonic.net>
	<mailman.1300.1269939807.23598.python-list@python.org>
	<hosnrh$6na$1@news.eternal-september.org>
Message-ID: <4bb38a31$0$1595$742ec2ed@news.sonic.net>

Alf P. Steinbach wrote:
> * Jean-Michel Pichavant:
>> John Nagle wrote:
>>> Jonathan Hayward wrote:
>>>> I've posted "Usability, the Soul of Python: An Introduction to the
>>>> Python Programming Language Through the Eyes of Usability", at:
>>>>
>>>>    http://JonathansCorner.com/python/
>>>
>>>    No, it's just a rather verbose introduction to Python, in dark brown
>>> type on a light brown background.  One could write a good paper on this
>>> topic, but this isn't it.
>>>
>>>
>>>                 John Nagle
>> Why is it bad ?
> 
> Consider
> 
> 
> <quote>
>  From a usability standpoint, the braces go with the lines to print out 
> the stanza rather than the for statement or the code after, so the 
> following is best:

    The last time I ran a C++ project, I just had everyone run their
code through Artistic Style ("http://astyle.sourceforge.net") with
"--style=ansi".  No more inconsistencies.

				John Nagle


From see at sig.for.address  Wed Mar 31 14:58:03 2010
From: see at sig.for.address (Victor Eijkhout)
Date: Wed, 31 Mar 2010 13:58:03 -0500
Subject: sort array, apply rearrangement to second
References: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
	<mailman.1358.1270004482.23598.python-list@python.org>
Message-ID: <1jg81f7.5ub3191oci9fkN%see@sig.for.address>

Robert Kern <robert.kern at gmail.com> wrote:

> second[first.argsort()]

Really cool. Thanks.

> Ask numpy questions on the numpy mailing list.

I will. I thought that this question would have an answer in a generic
python idiom.

Victor.
-- 
Victor Eijkhout -- eijkhout at tacc utexas edu


From pmaupin at gmail.com  Wed Mar 31 15:05:24 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Wed, 31 Mar 2010 12:05:24 -0700 (PDT)
Subject: sorting ascending/descending with operator.attrgetter
References: <a8c7b02e-73d8-4ae2-a76a-e54a01bd22f5@b30g2000yqd.googlegroups.com>
Message-ID: <96712ef1-5c10-455b-904c-c2436736c9d2@35g2000yqm.googlegroups.com>

On Mar 31, 12:08?pm, Chris Curvey <ccur... at gmail.com> wrote:
> I must be having a brain cramp. ?Given a list of objects, how can I
> sort the list on one attribute in descending order, then sort within
> each group in ascending order on another attribute.
>
> For example:
>
> class Foo:
> ? ? def __init__(self, a, b, c):
> ? ? ? ? self.a = a
> ? ? ? ? self.b = b
> ? ? ? ? self.c = c
>
> I can do "allmyfoos.sort(operator.attrgetter('a','b'))" to sort
> ascending on both attributes, but how could i sort by "a, descending,
> then b, ascending)?"

You can provide a cmp function to the string sort method, e.g. cmp =
lambda x,y: -cmp(x.a, y.a) or cmp(x.b, y.b)

You can also possibly gain some efficiency by using key instead of
cmp.
For example, if one of the objects is numeric, you can call sort()
with something like key = lambda x:(-x.a, x.b)

Or if b is numeric but a is a string, you could use lambda x:(x.a, -
x.b) and then use list.reverse() afterward.

HTH,
Pat


From gatoygata2 at gmail.com  Wed Mar 31 15:11:18 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Wed, 31 Mar 2010 12:11:18 -0700 (PDT)
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<7316f3d2-bcc9-4a1a-8598-cdd5d41fd74b@k17g2000yqb.googlegroups.com> 
	<hou0rt$69n$2@lust.ihug.co.nz>
Message-ID: <a3f80702-e59d-40de-9398-a0d4e52a1a5f@8g2000yqz.googlegroups.com>

On Mar 31, 1:18?am, Lawrence D'Oliveiro <l... at geek-
central.gen.new_zealand> wrote:
> In message <7316f3d2-bcc9-4a1a-8598-
>
> cdd5d41fd... at k17g2000yqb.googlegroups.com>, Joaquin Abian wrote:
> > (a==b) and 'YES' or 'NO'
>
> > Yes, ugly
>
> Why would you say that?s ugly?
>
> By the way, you don?t need the parentheses.

Lawrence,
maybe it was not the perfect adjective. I meant 'not beautiful'
because for me it is not an expression I can easily read. It is not
internalized in my brain. I know how to use it because I learnt how to
do it time ago(in Learning Python) but always I have to think how it
works (like a mental translation). For me the other alternative
expresion is more readable:

take_it if you_have_it else search_for_it

this was already in my brain before I started writing python code.
Thus, I prefer this option for my code. On the other hand, in my post,
I proposed the and/or style because I found interesting how
symmetrical it was with the one the OP was refering:

(a==b)  ?  'Yes'  : 'No'
(a==b) and 'Yes' or 'No'


I know, I could write it without parenthesis but it seems more
naturally organized with it and I read it faster and clearly. I dont
know exactly why but it seems also safer to me.

Joaquin


From robert.kern at gmail.com  Wed Mar 31 15:13:52 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 31 Mar 2010 14:13:52 -0500
Subject: sort array, apply rearrangement to second
In-Reply-To: <1jg81f7.5ub3191oci9fkN%see@sig.for.address>
References: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>	<mailman.1358.1270004482.23598.python-list@python.org>
	<1jg81f7.5ub3191oci9fkN%see@sig.for.address>
Message-ID: <hp06th$47o$1@dough.gmane.org>

On 2010-03-31 13:58 PM, Victor Eijkhout wrote:
> Robert Kern<robert.kern at gmail.com>  wrote:
>
>> second[first.argsort()]
>
> Really cool. Thanks.
>
>> Ask numpy questions on the numpy mailing list.
>
> I will. I thought that this question would have an answer in a generic
> python idiom.

When dealing with numpy arrays, the generic Python idiom is often much slower.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From ricaraoz at gmail.com  Wed Mar 31 15:21:48 2010
From: ricaraoz at gmail.com (=?ISO-8859-1?Q?Ricardo_Ar=E1oz?=)
Date: Wed, 31 Mar 2010 16:21:48 -0300
Subject: "Usability, the Soul of Python"
In-Reply-To: <hou162$69n$3@lust.ihug.co.nz>
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>	<4bb14173$0$1640$742ec2ed@news.sonic.net>	<mailman.1300.1269939807.23598.python-list@python.org>	<hosnrh$6na$1@news.eternal-september.org>	<20100331003241.47fa91f6@vulcan.local>
	<hou162$69n$3@lust.ihug.co.nz>
Message-ID: <4BB3A0CC.2090409@gmail.com>

Lawrence D'Oliveiro wrote:
> In message <20100331003241.47fa91f6 at vulcan.local>, Robert Fendt wrote:
>
>   
>> The braces are gone, and with them the holy wars.
>>     
>
> Let me start a new one. I would still put in some kind of explicit indicator 
> of the end of the grouping construct:
>
>     count = 99
>     while count > 0:
>         print u'%d slabs of spam in my mail!' % count
>         print u'%d slabs of spam,' % count
>         print u'Send one to abuse and Just Hit Delete,'
>         count += 1
>         print u'%d slabs of spam in my mail!' % count
>         print u''
>     #end while
>   
<irony>
    I'd much prefer the following :

        ## Beginning of a program block
        count = 99      # Set the variable count as a name for the
integer object 99
        while count > 0:      # if count is the name of 0 or less then
exit the loop (this will NEVER happen)
            ## Beginning of a while loop
            print u'%d slabs of spam in my mail!' % count
            print u'%d slabs of spam,' % count
            print u'Send one to abuse and Just Hit Delete,'
            count += 1
            print u'%d slabs of spam in my mail!' % count
            print u''
            ## End of a while loop
        ## End of a program block

    Which is reeeaaally easier to understand than :

        count = 99
        while True
            print u'%d slabs of spam in my mail!' % count
            print u'%d slabs of spam,' % count
            print u'Send one to abuse and Just Hit Delete,'
            count += 1
            print u'%d slabs of spam in my mail!' % count
            print u''

</irony>

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From steve at holdenweb.com  Wed Mar 31 15:22:26 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 31 Mar 2010 15:22:26 -0400
Subject: sort array, apply rearrangement to second
In-Reply-To: <1jg81f7.5ub3191oci9fkN%see@sig.for.address>
References: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>	<mailman.1358.1270004482.23598.python-list@python.org>
	<1jg81f7.5ub3191oci9fkN%see@sig.for.address>
Message-ID: <hp07dr$6c5$1@dough.gmane.org>

Victor Eijkhout wrote:
> Robert Kern <robert.kern at gmail.com> wrote:
> 
>> second[first.argsort()]
> 
> Really cool. Thanks.
> 
>> Ask numpy questions on the numpy mailing list.
> 
> I will. I thought that this question would have an answer in a generic
> python idiom.
> 
> Victor.

Not an unreasonable assumption, but it turns out that for most Python
users (estimate PFTA: 97%) numpy/scipt is esoteric knowledge.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From python at rcn.com  Wed Mar 31 16:09:54 2010
From: python at rcn.com (Raymond Hettinger)
Date: Wed, 31 Mar 2010 13:09:54 -0700 (PDT)
Subject: sort array, apply rearrangement to second
References: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
Message-ID: <8d8415a5-ba77-4dc3-b870-f159886e76b5@i25g2000yqm.googlegroups.com>

On Mar 30, 4:25?pm, s... at sig.for.address (Victor Eijkhout) wrote:
> I have two arrays, made with numpy. The first one has values that I want
> to use as sorting keys; the second one needs to be sorted by those keys.
> Obviously I could turn them into a dictionary ?of pairs and sort by the
> first member, but I think that's not very efficient, at least in space,
> and this needs to be done as efficiently as possible.

Alf's recommendation is clean and correct.  Just make a list of
tuples.

FWIW, here's a little hack that does the work for you:

>>> values = ['A', 'B', 'C', 'D', 'E']
>>> keys = [50, 20, 40, 10, 30]
>>> keyiter = iter(keys)
>>> sorted(values, key=lambda k: next(keyiter))
['D', 'B', 'E', 'C', 'A']


Raymond


From pulikesimahesh at gmail.com  Wed Mar 31 16:18:44 2010
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Date: Wed, 31 Mar 2010 13:18:44 -0700 (PDT)
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From icanbob at gmail.com  Wed Mar 31 16:21:16 2010
From: icanbob at gmail.com (bobicanprogram)
Date: Wed, 31 Mar 2010 13:21:16 -0700 (PDT)
Subject: Python + OpenOffice Calc
References: <4bb2fe14$0$1120$4fafbaef@reader3.news.tin.it>
Message-ID: <1233c19f-3268-4e57-bec7-e72c17941981@z9g2000vbm.googlegroups.com>

On Mar 31, 2:47 am, Tracubik <affdfsdfds... at b.com> wrote:
> Hi all!
> i'm giving away to a friend of mine that have a garage (he repair car) my
> old computer. He will use it essentialy to create estimates of the work
> via an ods file (i've made a simple ods file to be filled with the cost of
> materials and a description of the work).
> He's totally new with computer and have difficult to fill the ods file, so
> i'ld like to create a simple python program that help him to introduce the
> data in to the ods file via a simple gui.
> So what i'm looking for is a way in python to insert data in a particular
> cell of the ods file and possibly to save it and print it when it's full
> filled with data.
>
> the guy is similar to this:
>
> 3 fields: quantity - description of the piece bought - price
>
> a way to add a new "line" if needed (for a new piece entry) similar to the
> "add rule" in evolution
>
> 1 text field for the description of the work + 1 field for the price of
> the work
>
> and off course a way to insert this data in to the ods file via python
>
> Any hints/tutorial/info?
>
> thanks
> Nico


OOcalc supports a little known feature whereby data can be
automatically sync'd between the spreadsheet and an HTML table.   A
few years ago I did up a demo of this in action using Tcl/Tk (http://
www.icanprogram.com/hosug).  It should not be too hard to port this
idea to Python.

bob


From steve at holdenweb.com  Wed Mar 31 16:21:17 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 31 Mar 2010 16:21:17 -0400
Subject: Question about list comprehension/standard "for" disparities
In-Reply-To: <y2s3e2a7ec1003311058p13c387d9r1cc31949fbf6817b@mail.gmail.com>
References: <y2s3e2a7ec1003311058p13c387d9r1cc31949fbf6817b@mail.gmail.com>
Message-ID: <hp0as7$j60$1@dough.gmane.org>

Nathan Rice wrote:
> I was just wondering, why the list/generator and standard "for" have
> disparities?
> 
> It would be really nice to be able to do:
> 
> for x in y if foo:
>     ...
> 
> rather than:
> 
> for x in (x for x in y if foo):
>     ...
> 
But it's not much of an issue when you can easily write

for x in y:
    if foo:
        ...

is it? What's the advantage of your preferred format that overrides its
reduced readability?

> Also, from a style standpoint, I prefer to extract the loop logic into a
> function if it's more than a few lines long.  As a result, most of my
> loops are of the form:
> 
> for x in y:
>     bar(x)
> 
> So I frequently end up using map.  As I understand it, there is some
> discussion of removing map() in favor of comprehensions.  Is there any
> reason why the for syntax could not be expanded to accommodate
> statements of the form:
> 
> bar(x) for x in y
> 
> ?
> 
Put parentheses around it and you have a generator expression, which
sounds like it's exactly what you want: a lazy way of producing a
sequence of values:

>>> y = ["this", "that", "and", "the", "other"]
>>> def bar(x):
...     return 2*x
...
>>> ge = (bar(x) for x in y)
>>> ge
<generator object at 0x7ff28f2c>
>>> for x in ge:
...   print x
...
thisthis
thatthat
andand
thethe
otherother
>>>

If you need to use the sequence repeatedly then a list comprehension is
clearly better, since you don't exhaust it by iterating over it.

I doubt map's going to disappear, but neither are comprehensions or
generator expressions.

> This inconsistency really bothered me when I started playing with
> python, and it seems kind of at-odds with the "one right way to do
> things" mentality.
> 
That's the Platonic ideal, but the real world is a dirty place and
Python lives firmly in the real world!

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From sccolbert at gmail.com  Wed Mar 31 16:38:04 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Wed, 31 Mar 2010 16:38:04 -0400
Subject: Python + OpenOffice Calc
In-Reply-To: <1233c19f-3268-4e57-bec7-e72c17941981@z9g2000vbm.googlegroups.com>
References: <4bb2fe14$0$1120$4fafbaef@reader3.news.tin.it>
	<1233c19f-3268-4e57-bec7-e72c17941981@z9g2000vbm.googlegroups.com>
Message-ID: <y2q7f014ea61003311338qefe75d13z287c635e6262cfb0@mail.gmail.com>

On Wed, Mar 31, 2010 at 4:21 PM, bobicanprogram <icanbob at gmail.com> wrote:

> On Mar 31, 2:47 am, Tracubik <affdfsdfds... at b.com> wrote:
> > Hi all!
> > i'm giving away to a friend of mine that have a garage (he repair car) my
> > old computer. He will use it essentialy to create estimates of the work
> > via an ods file (i've made a simple ods file to be filled with the cost
> of
> > materials and a description of the work).
> > He's totally new with computer and have difficult to fill the ods file,
> so
> > i'ld like to create a simple python program that help him to introduce
> the
> > data in to the ods file via a simple gui.
> > So what i'm looking for is a way in python to insert data in a particular
> > cell of the ods file and possibly to save it and print it when it's full
> > filled with data.
> >
> > the guy is similar to this:
> >
> > 3 fields: quantity - description of the piece bought - price
> >
> > a way to add a new "line" if needed (for a new piece entry) similar to
> the
> > "add rule" in evolution
> >
> > 1 text field for the description of the work + 1 field for the price of
> > the work
> >
> > and off course a way to insert this data in to the ods file via python
> >
> > Any hints/tutorial/info?
> >
> > thanks
> > Nico
>
>
> OOcalc supports a little known feature whereby data can be
> automatically sync'd between the spreadsheet and an HTML table.   A
> few years ago I did up a demo of this in action using Tcl/Tk (http://
> www.icanprogram.com/hosug).  It should not be too hard to port this
> idea to Python.
>
> bob
> --
> http://mail.python.org/mailman/listinfo/python-list
>

if he cant click on a cell in oocalc, what makes you think he'll be able to
use your program?
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From lxkain at gmail.com  Wed Mar 31 16:59:01 2010
From: lxkain at gmail.com (LX)
Date: Wed, 31 Mar 2010 13:59:01 -0700 (PDT)
Subject: decorators only when __debug__ == True
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>
	<mailman.1295.1269912866.23598.python-list@python.org>
	<7778821c-84f3-4829-8e05-85134c5d6c5b@y17g2000yqd.googlegroups.com>
	<mailman.1333.1269985284.23598.python-list@python.org>
Message-ID: <d2fd9d5f-e882-4e02-a569-6c9e39996c4d@k17g2000yqb.googlegroups.com>

On Mar 30, 2:41?pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
> LX wrote:
> > On Mar 29, 6:34 pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
> >> LX wrote:
> >>> Hi all, I have a question about decorators. I would like to use them
> >>> for argument checking, and pre/post conditions. However, I don't want
> >>> the additional overhead when I run in non-debug mode. I could do
> >>> something like this, using a simple trace example.
> >>> @decorator
> >>> def pass_decorator(f, *args, **kw): # what about the slow-down that
> >>> incurs when using pass_decorator?
> >>> ? ? return f(*args, **kw)
> >>> @decorator
> >>> def trace_decorator(f, *args, **kw):
> >>> ? ? print "calling %s with args %s, %s" % (f.func_name, args, kw)
> >>> ? ? return f(*args, **kw)
> >>> trace_enable_flag = False #__debug__
> >>> trace = trace_decorator if trace_enable_flag else pass_decorator
> >>> Trouble is, there is still an additional encapsulating function call.
> >>> Is there any way to eliminate the extra function call altogether?
> >>> Thanks in advance!
> >> I think you have misunderstood certain details about decorators.
>
> >> This code with adecorator:
>
> >> ? ? ?@decorator
> >> ? ? ?def hello():
> >> ? ? ? ? ?print "hello world"
>
> >> basically does this:
>
> >> ? ? ?def hello():
> >> ? ? ? ? ?print "hello world"
> >> ? ? ?hello =decorator(hello)
>
> >> so your non-decoratorjust needs to return the function it was passed:
>
> >> ? ? ?def pass_decorator(func):
> >> ? ? ? ? ?return func
>
> >> and your tracedecoratorwould be something like this:
>
> >> ? ? ?def trace_decorator(func):
> >> ? ? ? ? ?def show(*args, **kwargs):
> >> ? ? ? ? ? ? ?print "calling %s with args %s, %s" % (func.func_name,
> >> args, kwargs)
> >> ? ? ? ? ? ? ?result = func(*args, **kwargs)
> >> ? ? ? ? ? ? ?print "returning %s from %s" % (result, func.func_name)
> >> ? ? ? ? ? ? ?return result
> >> ? ? ? ? ?return show
>
> > Sure, but during runtime, pass_decorator will still be called, even
> > though it doesn't do anything. I am wondering if I can disable this
> > additional function call at non-debug runtime. In other words, I want
> > the calling stack to contain nodecoratorat all, not even
> > pass_decorator.
>
> > I should mention that, in my code, the symbol "decorator" is imported
> > from Michele Simionato'sdecorator.py file.
>
> pass_decorator will be called when the decorated function is _defined_,
> but not when the decorated function is _called_.

Why is it then that during runtime, with a breakpoint in some
arbitrary main() in main.py, I get something similar to the following
call stack:

main.py, line xxx, in <module>
 main()

<string>, line 2, in main

decorator.py, line 261, in pass_decorator
 return f(*args, **kw)

main.py, line yyy, in main()
 * breakpoint line here *

It looks to me the call stack still includes the additional level of
the decorator... what am I missing? Thank you for your time.


From novacompute at gmail.com  Wed Mar 31 17:26:24 2010
From: novacompute at gmail.com (wukong)
Date: Wed, 31 Mar 2010 14:26:24 -0700 (PDT)
Subject: subprocess only good for win32?
Message-ID: <353133a8-ff39-4b36-b96d-4836cea621bf@j41g2000vbe.googlegroups.com>

subprocess works fine on my win pro 32-bit, but not on vista 64-bit.
am i doing some wrong, or it just won't work for win64?  If that's
true, will it be extended to win64 in teh future?
thanks in advance
wk


From python at mrabarnett.plus.com  Wed Mar 31 17:27:05 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 31 Mar 2010 22:27:05 +0100
Subject: decorators only when __debug__ == True
In-Reply-To: <d2fd9d5f-e882-4e02-a569-6c9e39996c4d@k17g2000yqb.googlegroups.com>
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>	<mailman.1295.1269912866.23598.python-list@python.org>	<7778821c-84f3-4829-8e05-85134c5d6c5b@y17g2000yqd.googlegroups.com>	<mailman.1333.1269985284.23598.python-list@python.org>
	<d2fd9d5f-e882-4e02-a569-6c9e39996c4d@k17g2000yqb.googlegroups.com>
Message-ID: <4BB3BE29.70504@mrabarnett.plus.com>

LX wrote:
> On Mar 30, 2:41 pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
>> LX wrote:
>>> On Mar 29, 6:34 pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
>>>> LX wrote:
>>>>> Hi all, I have a question about decorators. I would like to use them
>>>>> for argument checking, and pre/post conditions. However, I don't want
>>>>> the additional overhead when I run in non-debug mode. I could do
>>>>> something like this, using a simple trace example.
>>>>> @decorator
>>>>> def pass_decorator(f, *args, **kw): # what about the slow-down that
>>>>> incurs when using pass_decorator?
>>>>>     return f(*args, **kw)
>>>>> @decorator
>>>>> def trace_decorator(f, *args, **kw):
>>>>>     print "calling %s with args %s, %s" % (f.func_name, args, kw)
>>>>>     return f(*args, **kw)
>>>>> trace_enable_flag = False #__debug__
>>>>> trace = trace_decorator if trace_enable_flag else pass_decorator
>>>>> Trouble is, there is still an additional encapsulating function call.
>>>>> Is there any way to eliminate the extra function call altogether?
>>>>> Thanks in advance!
>>>> I think you have misunderstood certain details about decorators.
>>>> This code with adecorator:
>>>>      @decorator
>>>>      def hello():
>>>>          print "hello world"
>>>> basically does this:
>>>>      def hello():
>>>>          print "hello world"
>>>>      hello =decorator(hello)
>>>> so your non-decoratorjust needs to return the function it was passed:
>>>>      def pass_decorator(func):
>>>>          return func
>>>> and your tracedecoratorwould be something like this:
>>>>      def trace_decorator(func):
>>>>          def show(*args, **kwargs):
>>>>              print "calling %s with args %s, %s" % (func.func_name,
>>>> args, kwargs)
>>>>              result = func(*args, **kwargs)
>>>>              print "returning %s from %s" % (result, func.func_name)
>>>>              return result
>>>>          return show
>>> Sure, but during runtime, pass_decorator will still be called, even
>>> though it doesn't do anything. I am wondering if I can disable this
>>> additional function call at non-debug runtime. In other words, I want
>>> the calling stack to contain nodecoratorat all, not even
>>> pass_decorator.
>>> I should mention that, in my code, the symbol "decorator" is imported
>>> from Michele Simionato'sdecorator.py file.
>> pass_decorator will be called when the decorated function is _defined_,
>> but not when the decorated function is _called_.
> 
> Why is it then that during runtime, with a breakpoint in some
> arbitrary main() in main.py, I get something similar to the following
> call stack:
> 
> main.py, line xxx, in <module>
>  main()
> 
> <string>, line 2, in main
> 
> decorator.py, line 261, in pass_decorator
>  return f(*args, **kw)
> 
> main.py, line yyy, in main()
>  * breakpoint line here *
> 
> It looks to me the call stack still includes the additional level of
> the decorator... what am I missing? Thank you for your time.

Are you still defining your decorators in the same way as in your
original post?

A decorator shouldn't call the function it's decorating.

My version of pass_decorator just returns the function it's decorating,
not call it, and my version of trace_decorator returns a locally-defined
function which will call the decorated function.


From apt.shansen at gmail.invalid  Wed Mar 31 17:28:27 2010
From: apt.shansen at gmail.invalid (Stephen Hansen)
Date: Wed, 31 Mar 2010 14:28:27 -0700
Subject: decorators only when __debug__ == True
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>
	<mailman.1295.1269912866.23598.python-list@python.org>
	<7778821c-84f3-4829-8e05-85134c5d6c5b@y17g2000yqd.googlegroups.com>
	<mailman.1333.1269985284.23598.python-list@python.org>
	<d2fd9d5f-e882-4e02-a569-6c9e39996c4d@k17g2000yqb.googlegroups.com>
Message-ID: <2010033114282721695-aptshansen@gmailinvalid>

On 2010-03-31 13:59:01 -0700, LX said:
>> pass_decorator will be called when the decorated function is _defined_,
>> but not when the decorated function is _called_.
> 
> Why is it then that during runtime, with a breakpoint in some
> arbitrary main() in main.py, I get something similar to the following
> call stack:
> 
> main.py, line xxx, in <module>
>  main()
> 
> <string>, line 2, in main
> 
> decorator.py, line 261, in pass_decorator
>  return f(*args, **kw)
> 
> main.py, line yyy, in main()
>  * breakpoint line here *
> 
> It looks to me the call stack still includes the additional level of
> the decorator... what am I missing? Thank you for your time.

You're not defining pass_decorator correctly. Always show us the actual 
code when you're showing results.

Your pass_decorator should just return the original function, 
undecorated, unmodified if you're not in debug. It should only return a 
decorated function otherwise.

Consider:

-----
from decorator import decorator

def debug_decorator(fn):
    if __debug__:
        def wrapper(fn, *args, **kwargs):
            # insert pre-condition testing here
            if len(args) != 1:
                raise ValueError("Incorrect number of arguments")

            result = fn(*args, **kwargs)

            # insert post-condition testing here
            if result not in (True, False):
                raise ValueError("Incorrect return value!")

            return result
        return decorator(wrapper, fn)
    else:
        return fn

@debug_decorator
def my_test(arg):
    if not arg:
        raise RuntimeError
    return True

my_test(0)
-----

And the output depending on if you're in debug mode or not:
Top:test ixokai$ python deco.py
Traceback (most recent call last):
  File "deco.py", line 27, in <module>
    my_test(0)
  File "<string>", line 2, in my_test
  File "deco.py", line 10, in wrapper
    result = fn(*args, **kwargs)
  File "deco.py", line 24, in my_test
    raise RuntimeError
RuntimeError

Top:test ixokai$ python -O deco.py
Traceback (most recent call last):
  File "deco.py", line 27, in <module>
    my_test(0)
  File "deco.py", line 24, in my_test
    raise RuntimeError
RuntimeError


-- 
--S

... p.s: change the ".invalid" to ".com" in email address to reply privately.



From clp2 at rebertia.com  Wed Mar 31 17:33:13 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 31 Mar 2010 14:33:13 -0700
Subject: subprocess only good for win32?
In-Reply-To: <353133a8-ff39-4b36-b96d-4836cea621bf@j41g2000vbe.googlegroups.com>
References: <353133a8-ff39-4b36-b96d-4836cea621bf@j41g2000vbe.googlegroups.com>
Message-ID: <w2w50697b2c1003311433va6e18011w675e980193925f0b@mail.gmail.com>

On Wed, Mar 31, 2010 at 2:26 PM, wukong <novacompute at gmail.com> wrote:
> subprocess works fine on my win pro 32-bit, but not on vista 64-bit.
> am i doing some wrong, or it just won't work for win64? ?If that's
> true, will it be extended to win64 in teh future?

Please characterize exactly how it is not working for you.
Include any error message and/or exception traceback.

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


From dreadpiratejeff at gmail.com  Wed Mar 31 17:37:10 2010
From: dreadpiratejeff at gmail.com (J)
Date: Wed, 31 Mar 2010 17:37:10 -0400
Subject: Get Eclipse/PyDev to run scripts that don't end in .py
Message-ID: <n2r36dec4ff1003311437q7e41ec94ke8f3dcef830c3d44@mail.gmail.com>

Is there any way to tell PyDev in Eclipse to run a script that doesn't
end in .py?  Even if I have to go and manually set something for each
file...

I've inherited (in a manner of speaking) a dev project that is done in
python2.6... I pulled the latest dev branch and have it opened as a
project in Eclipse, however, none of the python files end in .py, so
PyDev only sees them as text files.  And because of that, I can't run
them in Eclipse to try my changes, debug, etc.

So, is there a way to make them show up as python code without the .py
extension?  Because of this, I also don't get any of the fancy
indenting and highlighting that I'd normally get...

Cheers,

Jeff


From novacompute at gmail.com  Wed Mar 31 17:43:26 2010
From: novacompute at gmail.com (wukong)
Date: Wed, 31 Mar 2010 14:43:26 -0700 (PDT)
Subject: subprocess only good for win32?
References: <353133a8-ff39-4b36-b96d-4836cea621bf@j41g2000vbe.googlegroups.com>
	<mailman.1389.1270071195.23598.python-list@python.org>
Message-ID: <ad600ab4-40db-43d6-a63a-b8fa3746e0a3@v13g2000vbf.googlegroups.com>

On Mar 31, 2:33?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Wed, Mar 31, 2010 at 2:26 PM, wukong <novacomp... at gmail.com> wrote:
> > subprocess works fine on my win pro 32-bit, but not on vista 64-bit.
> > am i doing some wrong, or it just won't work for win64? ?If that's
> > true, will it be extended to win64 in teh future?
>
> Please characterize exactly how it is not working for you.
> Include any error message and/or exception traceback.
>
> Cheers,
> Chris
> --http://blog.rebertia.com

thanks for checking in, here's the error msg.
"""
Traceback (most recent call last):
  File "C:/GUI/mainFunc.py", line 230, in OnSolve
    subprocess.call([filename])
  File "C:\Program Files (x86)\python26\lib\subprocess.py", line 470,
in call
    return Popen(*popenargs, **kwargs).wait()
  File "C:\Program Files (x86)\python26\lib\subprocess.py", line 621,
in __init__
    errread, errwrite)
  File "C:\Program Files (x86)\python26\lib\subprocess.py", line 830,
in _execute_child
    startupinfo)
WindowsError: [Error 14001] The application has failed to start
because its side-by-side configuration is incorrect. Please see the
application event log for more detail
"""

also subprocess.py clearly says
"""
import sys
mswindows = (sys.platform == "win32")
"""

thanks
wk


From tjreedy at udel.edu  Wed Mar 31 17:54:56 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 31 Mar 2010 17:54:56 -0400
Subject: subprocess only good for win32?
In-Reply-To: <353133a8-ff39-4b36-b96d-4836cea621bf@j41g2000vbe.googlegroups.com>
References: <353133a8-ff39-4b36-b96d-4836cea621bf@j41g2000vbe.googlegroups.com>
Message-ID: <hp0gbh$83v$1@dough.gmane.org>

On 3/31/2010 5:26 PM, wukong wrote:
> subprocess works fine on my win pro 32-bit, but not on vista 64-bit.

You are more likely to get a helpful answer if you give a minimal 
example and explain exactly what 'not [works fine]' means. What did 
happen? Include full error traceback if there was one.



From python at rcn.com  Wed Mar 31 18:42:34 2010
From: python at rcn.com (Raymond Hettinger)
Date: Wed, 31 Mar 2010 15:42:34 -0700 (PDT)
Subject: sorting ascending/descending with operator.attrgetter
References: <a8c7b02e-73d8-4ae2-a76a-e54a01bd22f5@b30g2000yqd.googlegroups.com>
Message-ID: <c1d24201-936c-4e8f-958f-66c821d07313@35g2000yqm.googlegroups.com>

On Mar 31, 10:08?am, Chris Curvey <ccur... at gmail.com> wrote:
> I must be having a brain cramp. ?Given a list of objects, how can I
> sort the list on one attribute in descending order, then sort within
> each group in ascending order on another attribute.
>
> For example:
>
> class Foo:
> ? ? def __init__(self, a, b, c):
> ? ? ? ? self.a = a
> ? ? ? ? self.b = b
> ? ? ? ? self.c = c
>
> I can do "allmyfoos.sort(operator.attrgetter('a','b'))" to sort
> ascending on both attributes, but how could i sort by "a, descending,
> then b, ascending)?"

Rely on sort stability and do two passes:

   allmyfoos.sort(operator.attrgetter('b'))
   allmyfoos.sort(operator.attrgetter('a'), reverse=True)


Raymond


From martin at v.loewis.de  Wed Mar 31 18:47:18 2010
From: martin at v.loewis.de (Martin v. Loewis)
Date: Thu, 01 Apr 2010 00:47:18 +0200
Subject: subprocess only good for win32?
In-Reply-To: <ad600ab4-40db-43d6-a63a-b8fa3746e0a3@v13g2000vbf.googlegroups.com>
References: <353133a8-ff39-4b36-b96d-4836cea621bf@j41g2000vbe.googlegroups.com>
	<mailman.1389.1270071195.23598.python-list@python.org>
	<ad600ab4-40db-43d6-a63a-b8fa3746e0a3@v13g2000vbf.googlegroups.com>
Message-ID: <4BB3D0F6.2010906@v.loewis.de>

> WindowsError: [Error 14001] The application has failed to start
> because its side-by-side configuration is incorrect. Please see the
> application event log for more detail

This is a configuration error on your system. The application you are
trying to start is incorrectly installed - it's not only that Python
can't start it, but nobody can.

Regards,
Martin


From abrahamalrajhi at gmail.com  Wed Mar 31 18:48:07 2010
From: abrahamalrajhi at gmail.com (Abethebabe)
Date: Wed, 31 Mar 2010 15:48:07 -0700 (PDT)
Subject: Getting a Python program to run of off a flash drive?
Message-ID: <d40a9679-1054-41b9-8f05-45165ee14f25@l36g2000yqb.googlegroups.com>

I wanted to know if there was a way I could get a Python program to
run off of my flash drive as soon as the computer (Windows) detected
the device?

For example I could have a a simple program that would create a text
document on the computers desktop when my flash drive is detected.


From steve at REMOVE-THIS-cybersource.com.au  Wed Mar 31 18:53:51 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 31 Mar 2010 22:53:51 GMT
Subject: decorators only when __debug__ == True
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>
	<mailman.1295.1269912866.23598.python-list@python.org>
	<7778821c-84f3-4829-8e05-85134c5d6c5b@y17g2000yqd.googlegroups.com>
	<mailman.1333.1269985284.23598.python-list@python.org>
	<d2fd9d5f-e882-4e02-a569-6c9e39996c4d@k17g2000yqb.googlegroups.com>
	<mailman.1388.1270070831.23598.python-list@python.org>
Message-ID: <4bb3d27f$0$8827$c3e8da3@news.astraweb.com>

On Wed, 31 Mar 2010 22:27:05 +0100, MRAB wrote:

> LX wrote:
[...]
>> It looks to me the call stack still includes the additional level of
>> the decorator... what am I missing? Thank you for your time.
> 
> Are you still defining your decorators in the same way as in your
> original post?
> 
> A decorator shouldn't call the function it's decorating.

*raises eyebrow*

Surely, in the general case, a decorator SHOULD call the function it is 
decorating? I'm sure you know that, but your wording is funny and could 
confuse the OP.

In this specific case, where the OP wants a "do nothing pass-decorator", 
he should do this:

def decorator(func):
    if __debug__:
        ...
    else:
        return func

rather than this:

def decorator(func):
    if __debug__:
        ...
    else:
        def inner(*args):
            return func(*args)
        return inner



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Wed Mar 31 18:57:10 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 31 Mar 2010 22:57:10 GMT
Subject: sorting ascending/descending with operator.attrgetter
References: <a8c7b02e-73d8-4ae2-a76a-e54a01bd22f5@b30g2000yqd.googlegroups.com>
	<96712ef1-5c10-455b-904c-c2436736c9d2@35g2000yqm.googlegroups.com>
Message-ID: <4bb3d346$0$8827$c3e8da3@news.astraweb.com>

On Wed, 31 Mar 2010 12:05:24 -0700, Patrick Maupin wrote:

> You can provide a cmp function to the string sort method, e.g. cmp =
> lambda x,y: -cmp(x.a, y.a) or cmp(x.b, y.b)

String sort method?

>>> ''.sort
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'str' object has no attribute 'sort'
>>> import string
>>> string.sort
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'sort'

Did you mean list sort method?



> You can also possibly gain some efficiency by using key instead of cmp.

That is an impressive understatement. key is called once for every item, 
cmp is called once for every comparison. cmp has been dropped from Python 
3.x because its performance is poor.



-- 
Steven


From rantingrick at gmail.com  Wed Mar 31 19:00:46 2010
From: rantingrick at gmail.com (rantingrick)
Date: Wed, 31 Mar 2010 16:00:46 -0700 (PDT)
Subject: Getting a Python program to run of off a flash drive?
References: <d40a9679-1054-41b9-8f05-45165ee14f25@l36g2000yqb.googlegroups.com>
Message-ID: <19123497-50f6-4234-bf99-6550f35324a4@o30g2000yqb.googlegroups.com>

On Mar 31, 5:48?pm, Abethebabe <abrahamalra... at gmail.com> wrote:
> I wanted to know if there was a way I could get a Python program to
> run off of my flash drive as soon as the computer (Windows) detected
> the device?
>
> For example I could have a a simple program that would create a text
> document on the computers desktop when my flash drive is detected.

Well i sure hope your intentions are for the forces of good and NOT
the forces of evil. Anyway the beauty of USB is the fact you can read
and write to it just like any other file on your harddisc, unlike with
CD media where you need a CS degree and MS's blessing. So now the
question really is

""" How do i run a python script when i plug in my flash drive"""?

And thats a good question. Well it's going to involve "something"
watching and waiting for this (big hint) "event" to happen. Maybe
something like a "Flash Drive plug in watcher sevice" Do you have any
experience with win32 programming?


From alfps at start.no  Wed Mar 31 19:04:39 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Thu, 01 Apr 2010 01:04:39 +0200
Subject: Getting a Python program to run of off a flash drive?
In-Reply-To: <d40a9679-1054-41b9-8f05-45165ee14f25@l36g2000yqb.googlegroups.com>
References: <d40a9679-1054-41b9-8f05-45165ee14f25@l36g2000yqb.googlegroups.com>
Message-ID: <hp0ki2$env$1@news.eternal-september.org>

* Abethebabe:
> I wanted to know if there was a way I could get a Python program to
> run off of my flash drive as soon as the computer (Windows) detected
> the device?
> 
> For example I could have a a simple program that would create a text
> document on the computers desktop when my flash drive is detected.

As long as its your own computer, no problem.

However, in the war between the corporate "we own your computer" and the 
individual's "I think the computer's mine" (so eloquently expressed as the main 
goal of the 70's Smalltalk project, to bring effective computing to the masses) 
the arms race is currently stuck at a point where any computer-literate person 
running Windows turns off the various run-automatically features as soon as 
they're sneak-introduced by Windows service packs and IE updates and whatever. I 
don't know, but I think there are six or seven such schemes. Happily, as far as 
I know they can all be turned off. If not for this then the recording industry 
could have sued a lot of people in Norway. But our laws require copy protection 
schemes to be effective, and a scheme based on a feature that most intelligent 
persons have turned off isn't effective, so wrt. law it's like it's not there.

I think it was EMI who once distributed a nasty rootkit (and yes, it was theirs, 
it was not an accident) as a copy protection scheme on a music CD. Getting a lot 
of bad publicity for that they and other record companies didn't back off but 
continued with just less malware-like auto run protection. I was perplexed when 
I learned that one CD with Madrugada, that I'd copied to my hard disk, was 
supposedly protected this way. Sure enough, there was this sticker on it. 
However, since the idiot scheme they used was based on auto-run I never noticed.


Cheers,

- Alf


From python at mrabarnett.plus.com  Wed Mar 31 19:27:51 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 01 Apr 2010 00:27:51 +0100
Subject: decorators only when __debug__ == True
In-Reply-To: <4bb3d27f$0$8827$c3e8da3@news.astraweb.com>
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>	<mailman.1295.1269912866.23598.python-list@python.org>	<7778821c-84f3-4829-8e05-85134c5d6c5b@y17g2000yqd.googlegroups.com>	<mailman.1333.1269985284.23598.python-list@python.org>	<d2fd9d5f-e882-4e02-a569-6c9e39996c4d@k17g2000yqb.googlegroups.com>	<mailman.1388.1270070831.23598.python-list@python.org>
	<4bb3d27f$0$8827$c3e8da3@news.astraweb.com>
Message-ID: <4BB3DA77.1040302@mrabarnett.plus.com>

Steven D'Aprano wrote:
> On Wed, 31 Mar 2010 22:27:05 +0100, MRAB wrote:
> 
>> LX wrote:
> [...]
>>> It looks to me the call stack still includes the additional level of
>>> the decorator... what am I missing? Thank you for your time.
>> Are you still defining your decorators in the same way as in your
>> original post?
>>
>> A decorator shouldn't call the function it's decorating.
> 
> *raises eyebrow*
> 
> Surely, in the general case, a decorator SHOULD call the function it is 
> decorating? I'm sure you know that, but your wording is funny and could 
> confuse the OP.
> 
What I mean is that the function that's doing the decorating shouldn't
call the function; it's the locally-defined wrapper function that calls
the decorated function.

For example, in my version of trace_decorator() it's show() that calls
the decorated function, not trace_decorator() itself.

Unless the word 'decorator' refers to the locally-defined function, in
which case, what do you call the function that does the wrapping, the
one whose name follows the '@'?

> In this specific case, where the OP wants a "do nothing pass-decorator", 
> he should do this:
> 
> def decorator(func):
>     if __debug__:
>         ...
>     else:
>         return func
> 
> rather than this:
> 
> def decorator(func):
>     if __debug__:
>         ...
>     else:
>         def inner(*args):
>             return func(*args)
>         return inner
> 
> 
> 



From lxkain at gmail.com  Wed Mar 31 20:01:05 2010
From: lxkain at gmail.com (LX)
Date: Wed, 31 Mar 2010 17:01:05 -0700 (PDT)
Subject: decorators only when __debug__ == True
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>
	<mailman.1295.1269912866.23598.python-list@python.org>
	<7778821c-84f3-4829-8e05-85134c5d6c5b@y17g2000yqd.googlegroups.com>
	<mailman.1333.1269985284.23598.python-list@python.org>
	<d2fd9d5f-e882-4e02-a569-6c9e39996c4d@k17g2000yqb.googlegroups.com>
	<2010033114282721695-aptshansen@gmailinvalid>
Message-ID: <241036ac-23c9-4f2c-8619-69fbba5f300e@30g2000yqi.googlegroups.com>

On Mar 31, 2:28?pm, Stephen Hansen <apt.shan... at gmail.invalid> wrote:
> On 2010-03-31 13:59:01 -0700, LX said:
>
>
>
>
>
> >> pass_decorator will be called when the decorated function is _defined_,
> >> but not when the decorated function is _called_.
>
> > Why is it then that during runtime, with a breakpoint in some
> > arbitrary main() in main.py, I get something similar to the following
> > call stack:
>
> > main.py, line xxx, in <module>
> > ?main()
>
> > <string>, line 2, in main
>
> >decorator.py, line 261, in pass_decorator
> > ?return f(*args, **kw)
>
> > main.py, line yyy, in main()
> > ?* breakpoint line here *
>
> > It looks to me the call stack still includes the additional level of
> > thedecorator... what am I missing? Thank you for your time.
>
> You're not defining pass_decorator correctly. Always show us the actual
> code when you're showing results.
>
> Your pass_decorator should just return the original function,
> undecorated, unmodified if you're not in debug. It should only return a
> decorated function otherwise.
>
> Consider:
>
> -----
> fromdecoratorimportdecorator
>
> def debug_decorator(fn):
> ? ? if __debug__:
> ? ? ? ? def wrapper(fn, *args, **kwargs):
> ? ? ? ? ? ? # insert pre-condition testing here
> ? ? ? ? ? ? if len(args) != 1:
> ? ? ? ? ? ? ? ? raise ValueError("Incorrect number of arguments")
>
> ? ? ? ? ? ? result = fn(*args, **kwargs)
>
> ? ? ? ? ? ? # insert post-condition testing here
> ? ? ? ? ? ? if result not in (True, False):
> ? ? ? ? ? ? ? ? raise ValueError("Incorrect return value!")
>
> ? ? ? ? ? ? return result
> ? ? ? ? returndecorator(wrapper, fn)
> ? ? else:
> ? ? ? ? return fn
>
> @debug_decorator
> def my_test(arg):
> ? ? if not arg:
> ? ? ? ? raise RuntimeError
> ? ? return True
>
> my_test(0)
> -----
>
> And the output depending on if you're in debug mode or not:
> Top:test ixokai$ python deco.py
> Traceback (most recent call last):
> ? File "deco.py", line 27, in <module>
> ? ? my_test(0)
> ? File "<string>", line 2, in my_test
> ? File "deco.py", line 10, in wrapper
> ? ? result = fn(*args, **kwargs)
> ? File "deco.py", line 24, in my_test
> ? ? raise RuntimeError
> RuntimeError
>
> Top:test ixokai$ python -O deco.py
> Traceback (most recent call last):
> ? File "deco.py", line 27, in <module>
> ? ? my_test(0)
> ? File "deco.py", line 24, in my_test
> ? ? raise RuntimeError
> RuntimeError
>
> --
> --S
>
> ... p.s: change the ".invalid" to ".com" in email address to reply privately.

Thank you all a lot! The last 3 posts helped me figure it out. Indeed,
my pass_decorator function used "@decorator", using the decoratory.py
library. This prevented return of the original function. The code that
I have now is:

#NOT THIS:
#@decorator
#def pass_decorator(f, *args, **kw): # what about the slow-down that
incurs when using pass_decorator
    #return f(*args, **kw)

def pass_decorator(f):
    return f

@decorator
def trace_decorator(f, *args, **kw):
    print "calling %s with args %s, %s" % (f.func_name, args, kw)
    return f(*args, **kw)

trace_enable_flag = False #__debug__
trace = trace_decorator if trace_enable_flag else pass_decorator


From pmaupin at gmail.com  Wed Mar 31 20:21:18 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Wed, 31 Mar 2010 17:21:18 -0700 (PDT)
Subject: sorting ascending/descending with operator.attrgetter
References: <a8c7b02e-73d8-4ae2-a76a-e54a01bd22f5@b30g2000yqd.googlegroups.com>
	<96712ef1-5c10-455b-904c-c2436736c9d2@35g2000yqm.googlegroups.com> 
	<4bb3d346$0$8827$c3e8da3@news.astraweb.com>
Message-ID: <bb4655b5-694f-4c2c-b681-996fd1cc5df7@z6g2000yqz.googlegroups.com>

On Mar 31, 5:57?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:

> Did you mean list sort method?

Why, yes.  Yes, I did.  Yes, I'm an old forgetful man who sometimes
misspeaks or mistypes, and you're the smartest, sharpest guy in the
world.  Most helpful, too. It's much more useful to show how I'm wrong
than to provide useful info to the OP.  Teaches people not to quickly
post on CLP to try to help out people with immediate problems.  No, it
would have been much more useful for me to self-edit my post for a
couple of days before posting.

Doesn't matter though.  The OP was sorting lists, not strings, so he
knew what I meant.

> > You can also possibly gain some efficiency by using key instead of cmp.
>
> That is an impressive understatement. key is called once for every item,
> cmp is called once for every comparison. cmp has been dropped from Python
> 3.x because its performance is poor.

Yes, well, I did have the "Use a key" statement before "use
cmp" (before I did the tiny bit of editing I did before posting) and
then it occurred to me that he might be sorting with strings, so I
thought I would give him something that worked, and then something
that might work better under some circumstances.

And, BTW, if he is only occasionally
sorting a few short strings^H^H^H^H^H^H^Hlists,
he'll never notice a performance difference.  But at least you can
take comfort that he now knows how superior your intellect is to mine.

Of course, he might accidentally underestimate Peter and Raymond's
intellect.  They published dual sort solutions that are, for most
cases, probably better than the single sort solution I published, but
neglected to call attention to just how bad my suggestion was.


From abrahamalrajhi at gmail.com  Wed Mar 31 20:32:33 2010
From: abrahamalrajhi at gmail.com (Abethebabe)
Date: Wed, 31 Mar 2010 17:32:33 -0700 (PDT)
Subject: Getting a Python program to run of off a flash drive?
References: <d40a9679-1054-41b9-8f05-45165ee14f25@l36g2000yqb.googlegroups.com>
	<19123497-50f6-4234-bf99-6550f35324a4@o30g2000yqb.googlegroups.com>
Message-ID: <11ac4094-655e-4474-98c8-fa8829d4f56f@z3g2000yqz.googlegroups.com>

On Mar 31, 7:00?pm, rantingrick <rantingr... at gmail.com> wrote:
> On Mar 31, 5:48?pm, Abethebabe <abrahamalra... at gmail.com> wrote:
>
> > I wanted to know if there was a way I could get a Python program to
> > run off of my flash drive as soon as the computer (Windows) detected
> > the device?
>
> > For example I could have a a simple program that would create a text
> > document on the computers desktop when my flash drive is detected.
>
> Well i sure hope your intentions are for the forces of good and NOT
> the forces of evil. Anyway the beauty of USB is the fact you can read
> and write to it just like any other file on your harddisc, unlike with
> CD media where you need a CS degree and MS's blessing. So now the
> question really is
>
> """ How do i run a python script when i plug in my flash drive"""?
>
> And thats a good question. Well it's going to involve "something"
> watching and waiting for this (big hint) "event" to happen. Maybe
> something like a "Flash Drive plug in watcher sevice" Do you have any
> experience with win32 programming?

I'm a web programmer and python is my first delve into desktop
programming. I had a rough guesstimation that I'd need to maybe use
wxpython with an API for the flash drive (wasn't sure if hardware had
this, I guess it would be the drivers?)

So do you think wxPython would have the answer I'm looking for? Thanks
for your reply btw


From abrahamalrajhi at gmail.com  Wed Mar 31 20:33:49 2010
From: abrahamalrajhi at gmail.com (Abethebabe)
Date: Wed, 31 Mar 2010 17:33:49 -0700 (PDT)
Subject: Getting a Python program to run of off a flash drive?
References: <d40a9679-1054-41b9-8f05-45165ee14f25@l36g2000yqb.googlegroups.com>
	<hp0ki2$env$1@news.eternal-september.org>
Message-ID: <c38f9f5f-a989-4f11-b20f-c97b92154d6a@u22g2000yqf.googlegroups.com>

On Mar 31, 7:04?pm, "Alf P. Steinbach" <al... at start.no> wrote:
> * Abethebabe:
>
> > I wanted to know if there was a way I could get a Python program to
> > run off of my flash drive as soon as the computer (Windows) detected
> > the device?
>
> > For example I could have a a simple program that would create a text
> > document on the computers desktop when my flash drive is detected.
>
> As long as its your own computer, no problem.
>
> However, in the war between the corporate "we own your computer" and the
> individual's "I think the computer's mine" (so eloquently expressed as the main
> goal of the 70's Smalltalk project, to bring effective computing to the masses)
> the arms race is currently stuck at a point where any computer-literate person
> running Windows turns off the various run-automatically features as soon as
> they're sneak-introduced by Windows service packs and IE updates and whatever. I
> don't know, but I think there are six or seven such schemes. Happily, as far as
> I know they can all be turned off. If not for this then the recording industry
> could have sued a lot of people in Norway. But our laws require copy protection
> schemes to be effective, and a scheme based on a feature that most intelligent
> persons have turned off isn't effective, so wrt. law it's like it's not there.
>
> I think it was EMI who once distributed a nasty rootkit (and yes, it was theirs,
> it was not an accident) as a copy protection scheme on a music CD. Getting a lot
> of bad publicity for that they and other record companies didn't back off but
> continued with just less malware-like auto run protection. I was perplexed when
> I learned that one CD with Madrugada, that I'd copied to my hard disk, was
> supposedly protected this way. Sure enough, there was this sticker on it.
> However, since the idiot scheme they used was based on auto-run I never noticed.
>
> Cheers,
>
> - Alf

Interesting, so every new computer I'd use it on I would need to
disable these filters? If I could just disable them on my computer
though I'd be happy enough.


From keith at nekotaku.com  Wed Mar 31 20:38:46 2010
From: keith at nekotaku.com (KB)
Date: Wed, 31 Mar 2010 17:38:46 -0700 (PDT)
Subject: CGI templating with python
Message-ID: <d085d2a4-7b63-4592-a20e-2703a2d4a7f0@10g2000yqq.googlegroups.com>

Hi there,

Years ago I wrote a LAMP app using python. I find I need a simple web
data entry tool to store records (stock research) and when I enter a
stock ticker, to pull up all the past research I have done. I am
imagining fields like ticker, date, pulldown menus for various
options, long text for comments etc..

It's a very light weight application, so I was wondering if using
something like Cheetah is the best way to do this?

Or should I research Zope further or are there any other suggestions?

Environment:
- Python 2.5 (w/ MySQLdb)
- MySQL 5.1
- Windows Vista

Many thanks in advance!


From martin.hellwig at dcuktec.org  Wed Mar 31 21:13:57 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Thu, 01 Apr 2010 02:13:57 +0100
Subject: Get Eclipse/PyDev to run scripts that don't end in .py
In-Reply-To: <mailman.1390.1270071456.23598.python-list@python.org>
References: <mailman.1390.1270071456.23598.python-list@python.org>
Message-ID: <hp0s0g$mfk$1@news.eternal-september.org>

On 03/31/10 22:37, J wrote:
> Is there any way to tell PyDev in Eclipse to run a script that doesn't
> end in .py?  Even if I have to go and manually set something for each
> file...
>
> I've inherited (in a manner of speaking) a dev project that is done in
> python2.6... I pulled the latest dev branch and have it opened as a
> project in Eclipse, however, none of the python files end in .py, so
> PyDev only sees them as text files.  And because of that, I can't run
> them in Eclipse to try my changes, debug, etc.
>
> So, is there a way to make them show up as python code without the .py
> extension?  Because of this, I also don't get any of the fancy
> indenting and highlighting that I'd normally get...
>
> Cheers,
>
> Jeff

You probably need to do that one level higher, i.e. in Eclipse (hint: 
Preferences>General>Editors>File Associations <don't forget to also add 
a 'Associated editors' for your new defined file type>).

I do have a couple of remarks though.

It sounds to me like you inherited something of more or less a 'shipped' 
product. Perhaps it would be wise to invest some time to restructure the 
project so that it works nicely with all the tools you have (unit 
testing, coverage, refactoring, etc.) and build a script that from your 
source builds the actually release (resembling that what you have 
inherited).

<whining_mode status='on'>
This question would probably have been more suitable in 
http://sourceforge.net/projects/pydev/forums/forum/293649 (that is the 
PyDev forum), and it is likely that they would have sent you through to 
http://www.eclipse.org/forums/ .
</whining_mode>

-- 
mph





From fabiofz at gmail.com  Wed Mar 31 21:17:09 2010
From: fabiofz at gmail.com (Fabio Zadrozny)
Date: Wed, 31 Mar 2010 22:17:09 -0300
Subject: Get Eclipse/PyDev to run scripts that don't end in .py
In-Reply-To: <n2r36dec4ff1003311437q7e41ec94ke8f3dcef830c3d44@mail.gmail.com>
References: <n2r36dec4ff1003311437q7e41ec94ke8f3dcef830c3d44@mail.gmail.com>
Message-ID: <u2ucfb578b21003311817jdb9913c9s7c7b234ffe43b1c3@mail.gmail.com>

On Wed, Mar 31, 2010 at 6:37 PM, J <dreadpiratejeff at gmail.com> wrote:
> Is there any way to tell PyDev in Eclipse to run a script that doesn't
> end in .py? ?Even if I have to go and manually set something for each
> file...
>
> I've inherited (in a manner of speaking) a dev project that is done in
> python2.6... I pulled the latest dev branch and have it opened as a
> project in Eclipse, however, none of the python files end in .py, so
> PyDev only sees them as text files. ?And because of that, I can't run
> them in Eclipse to try my changes, debug, etc.
>
> So, is there a way to make them show up as python code without the .py
> extension? ?Because of this, I also don't get any of the fancy
> indenting and highlighting that I'd normally get...


You have to change it in 2 places:

1. window > preferences > general > editors > file associations: add
the *.extension and bind it to the Python Editor (see how the *.py
association is done).

2. window > preferences > Pydev > editor > code style > file types:
add your custom extension there (and you may want to change the
default python extension if you'll keep creating modules with that
different extension).

Cheers,

Fabio


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 31 21:30:21 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 01 Apr 2010 01:30:21 GMT
Subject: decorators only when __debug__ == True
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>
	<mailman.1295.1269912866.23598.python-list@python.org>
	<7778821c-84f3-4829-8e05-85134c5d6c5b@y17g2000yqd.googlegroups.com>
	<mailman.1333.1269985284.23598.python-list@python.org>
	<d2fd9d5f-e882-4e02-a569-6c9e39996c4d@k17g2000yqb.googlegroups.com>
	<mailman.1388.1270070831.23598.python-list@python.org>
	<4bb3d27f$0$8827$c3e8da3@news.astraweb.com>
	<mailman.1392.1270078078.23598.python-list@python.org>
Message-ID: <pan.2010.04.01.01.30.21@REMOVE.THIS.cybersource.com.au>

On Thu, 01 Apr 2010 00:27:51 +0100, MRAB wrote:

>>> A decorator shouldn't call the function it's decorating.
>> 
>> *raises eyebrow*
>> 
>> Surely, in the general case, a decorator SHOULD call the function it is
>> decorating? I'm sure you know that, but your wording is funny and could
>> confuse the OP.
>> 
> What I mean is that the function that's doing the decorating shouldn't
> call the function; it's the locally-defined wrapper function that calls
> the decorated function.

Ah, gotcha, that makes sense. Now I understand the distinction you were 
making. Thank you for the clarification.



-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 31 21:34:36 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 01 Apr 2010 01:34:36 GMT
Subject: sorting ascending/descending with operator.attrgetter
References: <a8c7b02e-73d8-4ae2-a76a-e54a01bd22f5@b30g2000yqd.googlegroups.com>
	<96712ef1-5c10-455b-904c-c2436736c9d2@35g2000yqm.googlegroups.com>
	<4bb3d346$0$8827$c3e8da3@news.astraweb.com>
	<bb4655b5-694f-4c2c-b681-996fd1cc5df7@z6g2000yqz.googlegroups.com>
Message-ID: <pan.2010.04.01.01.34.36@REMOVE.THIS.cybersource.com.au>

On Wed, 31 Mar 2010 17:21:18 -0700, Patrick Maupin wrote:

> Doesn't matter though.  The OP was sorting lists, not strings, so he
> knew what I meant.

I have found that when people ask basic questions about fundamental 
Python operations like sorting, it is risky to assume that they will know 
what I meant if I say something different.

Since I've been on both the giving and receiving end of carelessly 
inaccurate answers, I know how frustrating it is to spend significant 
time trying to work out what I was doing wrong, only to be told much 
later "Oh, I meant you should do Y, not X. I thought you would understand 
what I meant."



-- 
Steven


From steve at holdenweb.com  Wed Mar 31 22:19:27 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 31 Mar 2010 22:19:27 -0400
Subject: sorting ascending/descending with operator.attrgetter
In-Reply-To: <pan.2010.04.01.01.34.36@REMOVE.THIS.cybersource.com.au>
References: <a8c7b02e-73d8-4ae2-a76a-e54a01bd22f5@b30g2000yqd.googlegroups.com>	<96712ef1-5c10-455b-904c-c2436736c9d2@35g2000yqm.googlegroups.com>	<4bb3d346$0$8827$c3e8da3@news.astraweb.com>	<bb4655b5-694f-4c2c-b681-996fd1cc5df7@z6g2000yqz.googlegroups.com>
	<pan.2010.04.01.01.34.36@REMOVE.THIS.cybersource.com.au>
Message-ID: <hp0vrp$gsr$1@dough.gmane.org>

Steven D'Aprano wrote:
> On Wed, 31 Mar 2010 17:21:18 -0700, Patrick Maupin wrote:
> 
>> Doesn't matter though.  The OP was sorting lists, not strings, so he
>> knew what I meant.
> 
> I have found that when people ask basic questions about fundamental 
> Python operations like sorting, it is risky to assume that they will know 
> what I meant if I say something different.
> 
> Since I've been on both the giving and receiving end of carelessly 
> inaccurate answers, I know how frustrating it is to spend significant 
> time trying to work out what I was doing wrong, only to be told much 
> later "Oh, I meant you should do Y, not X. I thought you would understand 
> what I meant."
> 
But you surely will admit that you could be held to, well rather than
"be pedantic" perhaps we should say "tend towards the literal"?

I'm the same myself, and I know from personal experience that while I am
(simply?) seeking accuracy and truth it sometimes bugs the hell out of
people ...

It's a geek thing.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From robert.kern at gmail.com  Wed Mar 31 22:46:54 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 31 Mar 2010 21:46:54 -0500
Subject: CGI templating with python
In-Reply-To: <d085d2a4-7b63-4592-a20e-2703a2d4a7f0@10g2000yqq.googlegroups.com>
References: <d085d2a4-7b63-4592-a20e-2703a2d4a7f0@10g2000yqq.googlegroups.com>
Message-ID: <hp11ft$k8u$1@dough.gmane.org>

On 2010-03-31 19:38 , KB wrote:
> Hi there,
>
> Years ago I wrote a LAMP app using python. I find I need a simple web
> data entry tool to store records (stock research) and when I enter a
> stock ticker, to pull up all the past research I have done. I am
> imagining fields like ticker, date, pulldown menus for various
> options, long text for comments etc..
>
> It's a very light weight application, so I was wondering if using
> something like Cheetah is the best way to do this?
>
> Or should I research Zope further or are there any other suggestions?

Django will probably get you where you want to go the fastest:

   http://www.djangoproject.com/

In particular, its admin interface will probably automatically generate a usable 
UI for you without your having to write many templates at all.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From aahz at pythoncraft.com  Wed Mar 31 23:33:35 2010
From: aahz at pythoncraft.com (Aahz)
Date: 31 Mar 2010 20:33:35 -0700
Subject: Getting a Python program to run of off a flash drive?
References: <d40a9679-1054-41b9-8f05-45165ee14f25@l36g2000yqb.googlegroups.com>
	<hp0ki2$env$1@news.eternal-september.org>
Message-ID: <hp146f$cd7$1@panix5.panix.com>

In article <hp0ki2$env$1 at news.eternal-september.org>,
Alf P. Steinbach <alfps at start.no> wrote:
>
>I think it was EMI who once distributed a nasty rootkit (and yes, it   
>was theirs, it was not an accident) as a copy protection scheme on a   
>music CD.                                                              

Sony, and I still (mostly) boycott Sony.  (I buy no Sony hardware, but
because Sony owns a movie studio, it's a little more difficult to boycott
Sony DVDs.)
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Why is this newsgroup different from all other newsgroups?  


From ded.utility at gmail.com  Wed Mar 31 23:36:56 2010
From: ded.utility at gmail.com (d d)
Date: Wed, 31 Mar 2010 23:36:56 -0400
Subject: how to build with --enable-shared so that binary knows where 
	libraries are.
Message-ID: <g2j9934b3321003312036q7c4eb489i8d4d9946448675d3@mail.gmail.com>

The following is on Linux.

I'd like to build python with ./configure --enable-shared.  And
install in a non-standard place (an nfs-mounted directory).

However, the binary is then not usable, since it can't find the
library.  I can fix this by defining LD_LIBRARY_PATH, but I don't want
to do that.  Doing anything system-specific is impractical, since many
systems will point to this directory (LD_LIBRARY_PATH is feasible,
though undesired, because it can be set in a common script that users
call from their .cshrc files.)

Is there a way to configure the build such that the binary will know
where the shared library is?

I found this:
http://koansys.com/tech/building-python-with-enable-shared-in-non-standard-location
It recommends LDFLAGS="-rpath <path to lib>", and mentions that you
get a "compiler cannot create executables" error unless you first
create the empty directory.  But I get that error even when I do
create the empty directory.

Any help would be appreciated.

--Dan


From rantingrick at gmail.com  Wed Mar 31 23:53:08 2010
From: rantingrick at gmail.com (rantingrick)
Date: Wed, 31 Mar 2010 20:53:08 -0700 (PDT)
Subject: Python + OpenOffice Calc
References: <4bb2fe14$0$1120$4fafbaef@reader3.news.tin.it>
Message-ID: <a4155d52-b57c-47e2-aae8-0a5bcbb53a1e@z4g2000yqa.googlegroups.com>

On Mar 31, 2:47?am, Tracubik <affdfsdfds... at b.com> wrote:
> Hi all!
> i'm giving away to a friend of mine that have a garage (he repair car) my
> old computer. He will use it essentialy to create estimates of the work
> via an ods file (i've made a simple ods file to be filled with the cost of
> materials and a description of the work).
> He's totally new with computer and have difficult to fill the ods file, so
> i'ld like to create a simple python program that help him to introduce the
> data in to the ods file via a simple gui.
> So what i'm looking for is a way in python to insert data in a particular
> cell of the ods file and possibly to save it and print it when it's full
> filled with data.
>
> the guy is similar to this:
>
> 3 fields: quantity - description of the piece bought - price


So what is your plan...?
  * Pop up a dialog with three entrys,
  * have him fill out the three entrys,
  * then have python insert the data into the spreadsheet?
...Why bother messing with OO, too much trouble for me?

If the guy is that scared of spreadsheets I would skip the spreadsheet
all together and just use a Tk.Listbox to display the data. Create a
big button at the bottom (preferably in Times 20 red font) that says
"NEW INPUT" and let him edit lines by double clicking on them. You
need a good Scrolled Listbox with a nice interface, an entry dialog,
and some file IO with backup protection. Thats about it.

I would probably create a new file every day, week, or month depending
on the amount of data he enters daily, you don't want to load enormous
files into a Tk.Listbox. Then just save all the data as csv and you
can always load it into a spreadsheet later if the IRS comes knocking,
or you need to print a professional looking spreadsheet ;-).  Simple,
100% python solution!

If you want to do this and need help i would be happy to offer my
assistance. This would be a "fairly" simple script and great learning
experience for you.


From clp2 at rebertia.com  Mon Mar  1 01:30:45 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 28 Feb 2010 22:30:45 -0800
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <4b8b5cef$0$1625$742ec2ed@news.sonic.net>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<4b8b5cef$0$1625$742ec2ed@news.sonic.net>
Message-ID: <50697b2c1002282230v2f421944u5866685a985fd904@mail.gmail.com>

On Sun, Feb 28, 2010 at 10:39 PM, John Nagle <nagle at animats.com> wrote:
> Patrick Maupin wrote:
>>
>> All:
>>
>> Finding .ini configuration files too limiting, JSON and XML to hard to
>> manually edit, and YAML too complex to parse quickly, I have started
>> work on a new configuration file parser.
>
> ? You're not supposed to edit those formats manually.

Huh? True for XML /perhaps/, but for the others I quite disagree.
Perhaps you could explain your reasoning?

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


From nagle at animats.com  Mon Mar  1 01:39:56 2010
From: nagle at animats.com (John Nagle)
Date: Sun, 28 Feb 2010 22:39:56 -0800
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <mailman.34.1267409372.23598.python-list@python.org>
References: <mailman.34.1267409372.23598.python-list@python.org>
Message-ID: <4b8b5cef$0$1625$742ec2ed@news.sonic.net>

Patrick Maupin wrote:
> All:
> 
> Finding .ini configuration files too limiting, JSON and XML to hard to
> manually edit, and YAML too complex to parse quickly, I have started
> work on a new configuration file parser.

    You're not supposed to edit those formats manually.

					John Nagle


From rantingrick at gmail.com  Mon Mar  1 01:41:26 2010
From: rantingrick at gmail.com (rantingrick)
Date: Sun, 28 Feb 2010 22:41:26 -0800 (PST)
Subject: Sample code usable Tkinter listbox
References: <hmf1qo$v9v$1@news.eternal-september.org>
	<5af8af6d-ecfc-4e4e-bba6-3622bbe874eb@o3g2000yqb.googlegroups.com>
	<hmfdvg$vu8$1@news.eternal-september.org>
Message-ID: <0f801cb4-20fc-4955-bdf6-ec7a2bc5cecb@g19g2000yqe.googlegroups.com>

On Feb 28, 9:57?pm, "Alf P. Steinbach" <al... at start.no> wrote:
> * rantingrick:

I just hate overriding all the paths to each listbox method. How about
just overideing the Listboxe's  geomerty methods once an your done?


#-- start script --#
import Tkinter as tk
from Tkconstants import *
import tkMessageBox as MB

class ScrolledList(tk.Listbox):
    def __init__(self, master, **kw):
        self.frame = tk.Frame(master)
        self.frame.rowconfigure(0, weight=1)
        self.frame.columnconfigure(0, weight=1)
        self.hbar = tk.Scrollbar(self.frame, orient=HORIZONTAL)
        self.block = tk.Frame(self.frame, width=18, height=18)
        self.block.grid(row=1, column=1)
        self.vbar = tk.Scrollbar(self.frame, orient=VERTICAL)
        kw.setdefault('activestyle', 'none')
        kw.setdefault('highlightthickness', 0)
        if 'pack' in kw.keys() and kw.pop('pack') == 1:
            self.frame.pack(fill=BOTH, expand=1)
        tk.Listbox.__init__(self, self.frame, **kw)
        self.grid(row=0, column=0, sticky=N+S+E+W)
        self.hbar.configure(command=self.xview)
        self.vbar.configure(command=self.yview)
        self.config(
            yscrollcommand=self.vbar.set,
            xscrollcommand=self.hbar.set
            )
        self.hbar.grid(row=1, column=0, sticky=W+E)
        self.vbar.grid(row=0, column=1, sticky=N+S)

        self.pack = lambda **kw: self.frame.pack(**kw)
        self.grid = lambda **kw: self.frame.grid(**kw)
        self.place = lambda **kw: self.frame.place(**kw)
        self.pack_config = lambda **kw: self.frame.pack_config(**kw)
        self.grid_config = lambda **kw: self.frame.grid_config(**kw)
        self.place_config = lambda **kw: self.frame.place_config(**kw)
        self.pack_configure = lambda **kw:
self.frame.pack_config(**kw)
        self.grid_configure = lambda **kw:
self.frame.grid_config(**kw)
        self.place_configure = lambda **kw:
self.frame.place_config(**kw)

    def gets(self):
        return self.get(0, END)

    def sets(self, arg):
        self.delete(0, END)
        try:
            arg = arg.strip('\n').splitlines()
        except AttributeError:
            pass
        if hasattr(arg, '__getitem__'):
            for item in arg:
                self.insert(END, str(item))
        else:
            raise TypeError("Scrolledlist.sets() requires a string of
iterable of strings")


if __name__ == '__main__':
    root = tk.Tk()
    listbox = ScrolledList(root, width=50, height=5, fg='green',
selectmode='Extended', pack=1)
    #listbox.sets(1.25)
    #listbox.sets('1\n2\n3\n4\n5\n\n\n')
    listbox.sets(range(100))
    root.mainloop()
#-- end script --#


From stefan_ml at behnel.de  Mon Mar  1 02:46:04 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Mon, 01 Mar 2010 08:46:04 +0100
Subject: stripping fields from xml file into a csv
In-Reply-To: <d83aff2e-6c28-4e99-b765-8f2cdbb282ab@g26g2000yqn.googlegroups.com>
References: <af06c4aa-04ea-4b63-b54b-b14539a47525@a18g2000yqc.googlegroups.com>	<mailman.11.1267344325.23598.python-list@python.org>	<7431a354-b9cb-490b-8b8b-b8f73d9698a8@s36g2000prf.googlegroups.com>	<mailman.24.1267384838.23598.python-list@python.org>
	<d83aff2e-6c28-4e99-b765-8f2cdbb282ab@g26g2000yqn.googlegroups.com>
Message-ID: <hmfrbs$9d6$1@dough.gmane.org>

Hal Styli, 01.03.2010 00:15:
> Stefan, I was happy to see such concise code.
> Your python worked with only very minor modifications.
> 
> Hai's test xml data *without* the first and last line is close enough
> to the data I am using:
> 
> <order customer="john" product="eggs" quantity="12" />
> <order customer="cindy" product="bread" quantity="1" />
> <order customer="larry" product="tea bags" quantity="100" />
> <order customer="john" product="butter" quantity="1" />
> <order product="chicken" quantity="2" customer="derek" />
> 
> ... quirky.
>
> I  get a large file given to me in this format. I believe it is
> created by something like:
> grep 'customer=' *.xml, where there are a large number of  xml files.

Try to get this fixed at the source. Exporting non-XML that looks like XML
is not a good idea in general, and it means that everyone who wants to read
the data has to adapt, instead of fixing the source once and for all.


> I had to edit the data to include the first and last lines, <orders>
> and </orders>,
> to get the python code to work. It's not an arduous task(!), but can
> you recommend a way to get it to work without
> manually editing the data?

Iff this cannot be fixed at the source, you can write a file-like wrapper
around a file that simply returns the boundary tags before and after
reading from the file itself. All you need is a .read(n) method, see the
documentation of the file type.


> One other thing, what's the Roland Mueller post above about (I'm
> viewing htis in google groups)? What would the test.xsl file look
> like?

This is the XSLT script he posted:

============================
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:fo="http://www.w3.org/1999/XSL/Format"
  version="1.0">

<!-- text output because we want to have an CSV file -->
<xsl:output method="text"/>

<!-- remove all whitespace coming with input XML -->
<xsl:strip-space elements="*"/>

<!-- matches any <order> element and extracts the customer,product&quantity
attributes -->
<xsl:template match="order">
  <xsl:value-of select="@customer"/>
  <xsl:text>,</xsl:text>
  <xsl:value-of select="@product"/>
  <xsl:text>,</xsl:text>
  <xsl:value-of select="@quantity"/>
  <xsl:text>
</xsl:text>
</xsl:template>

</xsl:stylesheet>
============================

Stefan



From steven.bethard at gmail.com  Mon Mar  1 03:31:09 2010
From: steven.bethard at gmail.com (Steven Bethard)
Date: Mon, 1 Mar 2010 00:31:09 -0800
Subject: [ANN] argparse 1.1 - Command-line parsing library
Message-ID: <d11dcfba1003010031i3daa4bcfp40ac18622127b82b@mail.gmail.com>

=======================
Announcing argparse 1.1
=======================
The argparse module provides an easy, declarative interface for
creating command line tools, which knows how to:
 * parse the arguments and flags from sys.argv
 * convert arg strings into objects for your program
 * format and print informative help messages
 * and much more...

The argparse module improves on the standard library optparse module
in a number of ways including:
 * handling positional arguments
 * supporting sub-commands
 * allowing alternative option prefixes like + and /
 * handling zero-or-more and one-or-more style arguments
 * producing more informative usage messages
 * providing a much simpler interface for custom types and actions

Download argparse
=================
The argparse homepage has links for source, MSI and single file
distributions of argparse:
 http://code.google.com/p/argparse/

About this release
==================
This is the final release of argparse before its move to the Python
2.7 and 3.2 standard libraries. Major enhancements in this release:

* ArgumentParser(..., version=XXX) is deprecated. Instead, you should
  use add_argument(..., action='version') which is more flexible and
  does not force you to accept -v/--version as your version flags.

* Usage and help (but not version) messages are now written to stdout
  instead of stderr, consistent with most existing programs.

* User defined types passed as a type= argument can now raise an
  ArgumentTypeError to provide a custom error message.

* Namespace objects now support containment, e.g. "'foo' in args".

Various bugs were also squashed, e.g. "from argparse import *" now
works. See the news file for detailed information:

  http://argparse.googlecode.com/svn/tags/r11/NEWS.txt

Enjoy!

Steve
-- 
Where did you get that preposterous hypothesis?
Did Steve tell you that?
        --- The Hiphopopotamus


From anthra.norell at bluewin.ch  Mon Mar  1 04:17:59 2010
From: anthra.norell at bluewin.ch (Anthra Norell)
Date: Mon, 01 Mar 2010 10:17:59 +0100
Subject: Six Minutes and fourty two seconds
In-Reply-To: <63Vhn.92$1n5.11@newsfe04.iad>
References: <63Vhn.92$1n5.11@newsfe04.iad>
Message-ID: <4B8B8647.1040008@bluewin.ch>

Tobiah wrote:
> Now that I use python, this is the amount of time 
> per day that I spend adding forgotten semicolons while
> debugging other languages.
>   
What compels you to write Python code without semicolons?

Frederic



From chris at simplistix.co.uk  Mon Mar  1 04:38:13 2010
From: chris at simplistix.co.uk (Chris Withers)
Date: Mon, 01 Mar 2010 09:38:13 +0000
Subject: How to use python to register a service (an existing .exe file)
In-Reply-To: <hln9ib$dp4$1@panix5.panix.com>
References: <4b79e28c$0$4610$426a74cc@news.free.fr>
	<hln9ib$dp4$1@panix5.panix.com>
Message-ID: <4B8B8B05.3060407@simplistix.co.uk>

Aahz wrote:
> In article <4b79e28c$0$4610$426a74cc at news.free.fr>,
> News123  <news123 at free.fr> wrote:
> 
>> Is there a python way to register new windows services.
>>
>> I am aware of the
>> instsrv.exe program, which can be used to install services.
>> I could use subprocess.Popen to call
>>
>> instsrv.exe "service_name" program.exe
>>
>> but wondered, whether there's already an existing function.
> 
> Use the win32 package.

Indeed, there's some intersting code in this area here:

http://svn.zope.org/Zope/trunk/src/nt_svcutils/service.py?rev=104819&view=auto

http://svn.zope.org/Zope/trunk/src/Zope2/Startup/zopectl.py?rev=105396&view=auto

...particularly in the do_install function in the latter...

Chris


-- 
Simplistix - Content Management, Batch Processing & Python Consulting
             - http://www.simplistix.co.uk



From bartsmeets86 at gmail.com  Mon Mar  1 04:48:05 2010
From: bartsmeets86 at gmail.com (Bart Smeets)
Date: Mon, 1 Mar 2010 10:48:05 +0100
Subject: Detecting new removable drives in Linux
Message-ID: <2119ee91003010148u4954d495kd53454c27f2b54b2@mail.gmail.com>

Hello,

I'm trying to write a script which detects when a new removable drive is
connected to the computer. On #python I was advised to use the
dbus-bindings. However the documentation on this is limited. Does anyone
know of an example of how I can detect new removable drives?

Thanks in advance!
Regards,
Bart
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From jeanmichel at sequans.com  Mon Mar  1 05:34:45 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 01 Mar 2010 11:34:45 +0100
Subject: Docstrings considered too complicated
In-Reply-To: <4B89D8BE.2040905@mrabarnett.plus.com>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>
	<4B89D8BE.2040905@mrabarnett.plus.com>
Message-ID: <4B8B9845.70604@sequans.com>

MRAB wrote:
> Gregory Ewing wrote:
>> Mel wrote:
>>
>>> You could think of it as a not bad use of the design principle 
>>> "Clear The Simple Stuff Out Of The Way First".  Destinations are 
>>> commonly a lot simpler than sources
>>
>> That's not usually true in assembly languages, though,
>> where the source and destination are both very restricted
>> and often about the same complexity.
>>
>> That's not to say that right-to-left is the wrong way
>> to do it in an assembly language, but there are less
>> misleading words than "move" that could be used.
>>
>> Z80 assembly language uses "load", which makes things
>> considerably clearer:
>>
>>   LD A, B  ; load A with B
>>
> Some processors distinguish between "load" (memory to register) and
> "store" (register to memory), and the destination and LHS operand of
> binary operations might be the same register, for example:
>
>     CLC ; clear the carry
>     LDA first ; accumulator := byte at first
>     ADCA second ; accumulator := accumulator + byte at second + carry
>     STA result ; byte at third := accumulator
>
Guys, you sound like people arguing about old school TV show / series 
like star treck :-)
- "He was wearing a blue suit !"
- "Check episode number 29, he appeared with a pink one!"

I'm glad I'm too young to had to code in assembler, or to bear the 
vision of those unlikely space suits from the 70's ;-)

JM


From lucaberto at libero.it  Mon Mar  1 05:48:34 2010
From: lucaberto at libero.it (luca72)
Date: Mon, 1 Mar 2010 02:48:34 -0800 (PST)
Subject: pythonpath
Message-ID: <7b9322bb-0b63-44e4-94c5-324006adff8b@t23g2000yqt.googlegroups.com>

Sorry for my stupid question if i have to load module from a folder i
have to append it to the sys path the folder?
ex:
if my  folder module is  /home/lucak904/Scrivania/Luca/enigma2
i do this :
import sys
sys.path.append('/home/lucak904/Scrivania/Luca/enigma2')
If this is correct why when i write:
form enigma2 import *
i get no module named enigma2

Thanks
Luca

I'm under linux




From candide at free.invalid  Mon Mar  1 05:58:57 2010
From: candide at free.invalid (candide)
Date: Mon, 01 Mar 2010 11:58:57 +0100
Subject: Starting Python from the terminal with no welcome message
In-Reply-To: <mailman.33.1267406497.23598.python-list@python.org>
References: <4b8afafa$0$28635$426a74cc@news.free.fr>
	<mailman.33.1267406497.23598.python-list@python.org>
Message-ID: <4b8b9df2$0$10478$426a74cc@news.free.fr>

Tim Chase a ?crit :

> 
>   bash$ python -ic ""
> 
> to get a python shell without the banner.
>


Works fine. thanks a lot.


From nanyaks at googlemail.com  Mon Mar  1 07:01:08 2010
From: nanyaks at googlemail.com (simn_stv)
Date: Mon, 1 Mar 2010 04:01:08 -0800 (PST)
Subject: taking python enterprise level?...
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<hm5mfo$mg1$1@news.eternal-september.org>
Message-ID: <d6e7c238-af52-4490-bf14-7c0edbe57051@g11g2000yqe.googlegroups.com>

On Feb 25, 12:21 pm, "Martin P. Hellwig" <martin.hell... at dcuktec.org>
wrote:
> On 02/25/10 10:26, simn_stv wrote:
> <cut>> what i am concerned about is scalability and
> > efficiency, well, as far as the 'core' is concerned.
>
> > would python be able to manage giving me a solid 'core' and will i be
> > able to use python provide any API i would like to implement?...
>
> <cut>
> Python isn't the most efficient language, the assembler provided by the
> maker of your CPU probably is the best you can get,
<cut>
LOL...;), yeah right, the mere thought of writing assembler
instructions is SCARY!!

>everything after
> that is a trade-off between performance and flexibility (flexible in the
> most flexible sense of the word :-)).
>
> That being said, for me, Python (well actually any turing complete
> programming language), is more like a box of lego with infinite amount
> of pieces.
> Scalability and API issues are the same as the shape and function of the
> model your making with lego.
>
> Sure some type of pieces might be more suited than other types but since
> you can simulate any type of piece with the ones that are already
> present, you are more limited by your imagination than by the language.
>
> So in short, I don't see any serious problems using Python, I have used
> it in Enterprise environments without any problems but than again I was
> aware not to use it for numerical intensive parts without the use of 3rd
> party libraries like numpy. Which for me resulted in not doing the
> compression of a database delta's in pure python but to offload that to
> a more suitable external program, still controlled from Python though.
>
> --
> mph



From marduk at python.net  Mon Mar  1 07:09:38 2010
From: marduk at python.net (Albert Hopkins)
Date: Mon, 01 Mar 2010 07:09:38 -0500
Subject: Detecting new removable drives in Linux
In-Reply-To: <2119ee91003010148u4954d495kd53454c27f2b54b2@mail.gmail.com>
References: <2119ee91003010148u4954d495kd53454c27f2b54b2@mail.gmail.com>
Message-ID: <1267445378.72674.3.camel@centar>

On Mon, 2010-03-01 at 10:48 +0100, Bart Smeets wrote:
> Hello,
> 
> 
> I'm trying to write a script which detects when a new removable drive
> is connected to the computer. On #python I was advised to use the
> dbus-bindings. However the documentation on this is limited. Does
> anyone know of an example of how I can detect new removable drives?

The documentation does suck and, at least for the python bindings, is
horribly outdated.

Also, the python bindings for dbus are not as "pythonic" as they could
be.  I was working on a python/dbus program a while back and basically
had to resort to looking at the source of a program that did, or almost
did, what I wanted and using that as an example.

You may even want to look at C sources as I don't think the python
bindings are that much different.

HTH,
-a





From lyh19901223 at gmail.com  Mon Mar  1 07:10:55 2010
From: lyh19901223 at gmail.com (=?UTF-8?B?5YiY5a6H6L6J?=)
Date: Mon, 1 Mar 2010 12:10:55 +0000
Subject: pythonpath
Message-ID: <b61e184d1003010410v1c27067epd10b25d563fdb360@mail.gmail.com>

>Sorry for my stupid question if i have to load module >from a folder ihave
to append it to the sys path the >folder?
>ex:
>if my  folder module is  /home/lucak904/Scrivania/Luca/enigma2
>i do this :
>import sys
>sys.path.append('/home/lucak904/Scrivania/Luca/enigma2')
>If this is correct why when i write:
>form enigma2 import *
>i get no module named enigma2

is  the folder module  /home/lucak904/Scrivania/Luca/enigma2.py?   i think
the extension  is necessary .

-- 
wolf python london
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From nanyaks at googlemail.com  Mon Mar  1 07:11:07 2010
From: nanyaks at googlemail.com (simn_stv)
Date: Mon, 1 Mar 2010 04:11:07 -0800 (PST)
Subject: taking python enterprise level?...
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<mailman.233.1267106234.4577.python-list@python.org>
	<hm650q$esk$1@news.eternal-september.org> 
	<mailman.244.1267114628.4577.python-list@python.org>
Message-ID: <e64e9273-6d28-4a94-b337-ce5e019e4ea6@z35g2000yqd.googlegroups.com>

On Feb 25, 5:18 pm, "D'Arcy J.M. Cain" <da... at druid.net> wrote:
> On Thu, 25 Feb 2010 15:29:34 +0000
> "Martin P. Hellwig" <martin.hell... at dcuktec.org> wrote:
>
> > On 02/25/10 13:58, D'Arcy J.M. Cain wrote:
> > > On Thu, 25 Feb 2010 02:26:18 -0800 (PST)
> > <cut>
> > > Our biggest problem was in
> > > a network heavy element of the app and that was low level TCP/IP stuff
> > > that rather than being Python's problem was something we used Python to
> > > fix.
> > <cut>
> > Out off interest, could you elaborate on that?
>
> Somewhat - there is an NDA so I can't give exact details.  It was
> crucial to our app that we sync up databases in Canada and the US (later
> Britain, Europe and Japan) in real time with those transactions.  Our
> problem was that even though our two server systems were on the
> backbone, indeed with the same major carrier, we could not keep them in
> sync.  We were taking way to long to transact an update across the
> network.
>
> The problem had to do with the way TCP/IP works, especially closer to
> the core.  Our provider was collecting data and sending it only after
> filling a buffer or after a timeout.  The timeout was short so it
> wouldn't normally be noticed and in most cases (web pages e.g.) the
> connection is opened, data is pushed and the connection is closed so
> the buffer is flushed immediately.  Our patterns were different so we
> were hitting the timeout on every single transaction and there was no
> way we would have been able to keep up.
>
> Our first crack at fixing this was to simply add garbage to the packet
> we were sending.  Making the packets an order of magnitude bigger sped
> up the proccessing dramatically.  That wasn't a very clean solution
> though so we looked for a better way.
>
> That better way turned out to asynchronous update transactions.  All we
> did was keep feeding updates to the remote site and forget about ACKS.
> We then had a second process which handled ACKS and tracked which
> packets had been properly transferred.  The system had IDs on each
> update and retries happened if ACKS didn't happen soon enough.
> Naturally we ignored ACKS that we had already processed.
>
> All of the above (and much more complexity not even discussed here) was
> handled by Python code and database manipulation.  There were a few
> bumps along the way but overall it worked fine.  If we were using C or
> even assembler we would not have sped up anything and the solution we
> came up with would have been horrendous to code.  As it was I and my
> chief programmer locked ourselves in the boardroom and had a working
> solution before the day was out.

sure it wouldnt have sped it up a bit, even a bit?; probably the
development and maintenance time would be a nightmare but it should
speed the app up a bit...

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

seriously added to the reputation of python, from my own
perspective...kudos python!


From marduk at python.net  Mon Mar  1 07:14:19 2010
From: marduk at python.net (Albert Hopkins)
Date: Mon, 01 Mar 2010 07:14:19 -0500
Subject: pythonpath
In-Reply-To: <7b9322bb-0b63-44e4-94c5-324006adff8b@t23g2000yqt.googlegroups.com>
References: <7b9322bb-0b63-44e4-94c5-324006adff8b@t23g2000yqt.googlegroups.com>
Message-ID: <1267445659.72674.8.camel@centar>

On Mon, 2010-03-01 at 02:48 -0800, luca72 wrote:
> Sorry for my stupid question if i have to load module from a folder i
> have to append it to the sys path the folder?
> ex:
> if my  folder module is  /home/lucak904/Scrivania/Luca/enigma2
> i do this :
> import sys
> sys.path.append('/home/lucak904/Scrivania/Luca/enigma2')
> If this is correct why when i write:
> form enigma2 import *
> i get no module named enigma2

There are two reasons for this:

     1. enigma2 is not in your namespace.  What's inside enigma is.  For
        example, you can't say "from site-packages import *"  because
        Python doesn't look at "site-packages". It looks at what's
        inside site-packages.  If you wanted" enigma2" to be in your
        namespace, you should add /home/lucak904/Scrivania/Luca" to your
        system path.
     2. Even if you did above, it may not work because enigma2 is a
        directory. Remember "from x import *" only works for modules and
        packages, so if you want "enigma2" to be a package, remember to
        add an (empty) __init__.py to the directory.

Hope this helps.
-a




From alfps at start.no  Mon Mar  1 07:19:32 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Mon, 01 Mar 2010 13:19:32 +0100
Subject: Sample code usable Tkinter listbox
In-Reply-To: <0f801cb4-20fc-4955-bdf6-ec7a2bc5cecb@g19g2000yqe.googlegroups.com>
References: <hmf1qo$v9v$1@news.eternal-september.org>
	<5af8af6d-ecfc-4e4e-bba6-3622bbe874eb@o3g2000yqb.googlegroups.com>
	<hmfdvg$vu8$1@news.eternal-september.org>
	<0f801cb4-20fc-4955-bdf6-ec7a2bc5cecb@g19g2000yqe.googlegroups.com>
Message-ID: <hmgbco$blv$1@news.eternal-september.org>

* rantingrick:
> 
>         kw.setdefault('activestyle', 'none')

Hm, let me steal this line... Thanks!


Cheers,

- Alf


From nanyaks at googlemail.com  Mon Mar  1 07:27:12 2010
From: nanyaks at googlemail.com (simn_stv)
Date: Mon, 1 Mar 2010 04:27:12 -0800 (PST)
Subject: taking python enterprise level?...
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<mailman.233.1267106234.4577.python-list@python.org>
	<hm650q$esk$1@news.eternal-september.org> 
	<mailman.244.1267114628.4577.python-list@python.org>
Message-ID: <79ff2083-bde8-4a60-854d-b90e3d944b94@y17g2000yqd.googlegroups.com>

On Feb 25, 5:18 pm, "D'Arcy J.M. Cain" <da... at druid.net> wrote:
> On Thu, 25 Feb 2010 15:29:34 +0000
> "Martin P. Hellwig" <martin.hell... at dcuktec.org> wrote:
>
> > On 02/25/10 13:58, D'Arcy J.M. Cain wrote:
> > > On Thu, 25 Feb 2010 02:26:18 -0800 (PST)
> > <cut>
> > > Our biggest problem was in
> > > a network heavy element of the app and that was low level TCP/IP stuff
> > > that rather than being Python's problem was something we used Python to
> > > fix.
> > <cut>
> > Out off interest, could you elaborate on that?
>
> Somewhat - there is an NDA so I can't give exact details.  It was
> crucial to our app that we sync up databases in Canada and the US (later
> Britain, Europe and Japan) in real time with those transactions.  Our
> problem was that even though our two server systems were on the
> backbone, indeed with the same major carrier, we could not keep them in
> sync.  We were taking way to long to transact an update across the
> network.
>
> The problem had to do with the way TCP/IP works, especially closer to
> the core.  Our provider was collecting data and sending it only after
> filling a buffer or after a timeout.  The timeout was short so it
> wouldn't normally be noticed and in most cases (web pages e.g.) the
> connection is opened, data is pushed and the connection is closed so
> the buffer is flushed immediately.  Our patterns were different so we
> were hitting the timeout on every single transaction and there was no
> way we would have been able to keep up.
>
> Our first crack at fixing this was to simply add garbage to the packet
> we were sending.  Making the packets an order of magnitude bigger sped
> up the proccessing dramatically.  That wasn't a very clean solution
> though so we looked for a better way.
>
> That better way turned out to asynchronous update transactions.  All we
> did was keep feeding updates to the remote site and forget about ACKS.
> We then had a second process which handled ACKS and tracked which
> packets had been properly transferred.  The system had IDs on each
> update and retries happened if ACKS didn't happen soon enough.
> Naturally we ignored ACKS that we had already processed.
>
> All of the above (and much more complexity not even discussed here) was
> handled by Python code and database manipulation.  There were a few
> bumps along the way but overall it worked fine.  If we were using C or
> even assembler we would not have sped up anything and the solution we
> came up with would have been horrendous to code.  As it was I and my
> chief programmer locked ourselves in the boardroom and had a working
> solution before the day was out.

sure it wouldnt have sped it up a bit, even a bit?; probably the
development and maintenance time would be a nightmare but it should
speed the app up a bit...

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

seriously added to the reputation of python, from my own
perspective...kudos python!


From nanyaks at googlemail.com  Mon Mar  1 07:32:16 2010
From: nanyaks at googlemail.com (simn_stv)
Date: Mon, 1 Mar 2010 04:32:16 -0800 (PST)
Subject: taking python enterprise level?...
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>
Message-ID: <6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>

On Feb 26, 10:32 am, mdipierro <massimodipierr... at gmail.com> wrote:
> 100,000 hits a day is not a low. I get that some day on my web server
> without problem and without one request dropped.
>
> Most frameworks web2py, Django, Pylons can handle that kind of load
> since Python is not the bottle neck.
taking a look at django right now, doesnt look too bad from where im
standing, maybe when i get into the code i'd run into some issues that
would cause some headaches!!

> You have to follow some tricks:
>
> 1) have the web server serve static pages directly and set the pragma
> cache expire to one month
> 2) cache all pages that do not have forms for at least few minutes
> 3) avoid database joins

but this would probably be to the detriment of my database design,
which is a no-no as far as im concerned. The way the tables would be
structured requires 'joins' when querying the db; or could you
elaborate a little??

> 4) use a server with at least 512KB Ram.

hmmm...!, still thinking about what you mean by this statement also.

> 5) if you pages are large, use gzip compression
>
> If you develop your app with the web2py framework, you always have the
> option to deploy on the Google App Engine. If you can live with their
> constraints you should have no scalability problems.
>
> Massimo
>
> On Feb 25, 4:26 am, simn_stv <nany... at googlemail.com> wrote:
>
> > hello people, i have been reading posts on this group for quite some
> > time now and many, if not all (actually not all!), seem quite
> > interesting.
> > i plan to build an application, a network based application that i
> > estimate (and seriously hope) would get as many as 100, 000 hits a day
> > (hehe,...my dad always told me to 'AIM HIGH' ;0), not some 'facebook'
> > or anything like it, its mainly for a financial transactions which
> > gets pretty busy...
> > so my question is this would anyone have anything that would make
> > python a little less of a serious candidate (cos it already is) and
> > the options may be to use some other languages (maybe java, C (oh
> > God))...i am into a bit of php and building API's in php would not be
> > the hard part, what i am concerned about is scalability and
> > efficiency, well, as far as the 'core' is concerned.
>
> > would python be able to manage giving me a solid 'core' and will i be
> > able to use python provide any API i would like to implement?...
>
> > im sorry if my subject was not as clear as probably should be!.
> > i guess this should be the best place to ask this sort of thing, hope
> > im so right.
>
> > Thanks

thanks for the feedback...


From stefan_ml at behnel.de  Mon Mar  1 07:46:22 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Mon, 01 Mar 2010 13:46:22 +0100
Subject: Detecting new removable drives in Linux
In-Reply-To: <2119ee91003010148u4954d495kd53454c27f2b54b2@mail.gmail.com>
References: <2119ee91003010148u4954d495kd53454c27f2b54b2@mail.gmail.com>
Message-ID: <hmgcuu$36f$1@dough.gmane.org>

Bart Smeets, 01.03.2010 10:48:
> I'm trying to write a script which detects when a new removable drive is
> connected to the computer. On #python I was advised to use the
> dbus-bindings. However the documentation on this is limited. Does anyone
> know of an example of how I can detect new removable drives?

You could execute a script from HAL, e.g. using halevt, and let the script
communicate with your program.

http://www.nongnu.org/halevt/

Stefan



From wuwei23 at gmail.com  Mon Mar  1 08:01:49 2010
From: wuwei23 at gmail.com (alex23)
Date: Mon, 1 Mar 2010 05:01:49 -0800 (PST)
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
Message-ID: <759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>

Andreas Waldenburger <use... at geekmail.INVALID> wrote:
> But as I said: a) I am (we are) not in a position to impose this (We
> don't work with the code, we just run the software).

I personally believe that the end users have _every_ right to impose
quality requirements on  code used within their business...although I
may not bring this up in front of them at meetings :)


From usenot at geekmail.INVALID  Mon Mar  1 08:09:43 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Mon, 1 Mar 2010 14:09:43 +0100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
Message-ID: <20100301140943.4edca16b@geekmail.INVALID>

On Mon, 1 Mar 2010 05:01:49 -0800 (PST) alex23 <wuwei23 at gmail.com>
wrote:

> Andreas Waldenburger <use... at geekmail.INVALID> wrote:
> > But as I said: a) I am (we are) not in a position to impose this (We
> > don't work with the code, we just run the software).
> 
> I personally believe that the end users have _every_ right to impose
> quality requirements on  code used within their business...although I
> may not bring this up in front of them at meetings :)

Huh? That's like demanding a certain type of truck or vehicle
maintenance plan from a trucking company. Sure, you *could* do it, but
that effectively only limits your options. I think there should be a
clear separation of concerns here.

/W

-- 
INVALID? DE!



From sayedjewel21 at gmail.com  Mon Mar  1 08:26:31 2010
From: sayedjewel21 at gmail.com (sayed jewel21)
Date: Mon, 1 Mar 2010 05:26:31 -0800 (PST)
Subject: connect with me
Message-ID: <3fc01795-acc4-4e9f-a683-a34293166899@d27g2000yqf.googlegroups.com>

dear guys you can do subscribe with site easily-

http://freelivestreamonlinepctv.blogspot.com/


From vinay_sajip at yahoo.co.uk  Mon Mar  1 08:27:30 2010
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Mon, 1 Mar 2010 05:27:30 -0800 (PST)
Subject: ANN: A new version (0.2.4) of the Python module which wraps GnuPG has
	been released.
Message-ID: <3188c3be-0ba5-48b6-a234-d5e41e034923@t23g2000yqt.googlegroups.com>

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

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

The current version passes all tests on Windows (Python 2.4, 2.5, 2.6,
3.1, Jython 2.5.1) and Ubuntu (Python 2.4, 2.5, 2.6, 3.0, Jython
2.5.1).

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

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

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

Simple usage:

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

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

Cheers

Vinay Sajip
Red Dove Consultants Ltd.


From highcar at gmail.com  Mon Mar  1 08:49:06 2010
From: highcar at gmail.com (elca)
Date: Mon, 1 Mar 2010 05:49:06 -0800 (PST)
Subject: python socket service related question!
Message-ID: <27743609.post@talk.nabble.com>


Hello,All

im totally new to socket programming in python. i was read some tutorial and
manual, but i didn't found what i want to make python related socket script
in manual or tutorial.

i want to make socket script which can send some info to server and also
receive some info from server. For example, i want to send my login
information to server, and want to receive result reply from server.

but i have no idea..how to send my login  information(id and password) to
server.

i was captured with wireshark, some process to send login info to server.

and i was found port number is 5300 and server ip is 58.225.56.152

and i was send id is 'aaaaaaa' and password 'bbbbbbb' and i was received

'USER NOT FOUND' result from server.

how can i make this kind of process with python socket ?

if anyone help me some reference or some example or anything help much
appreciate!

    0000   00 50 56 f2 c8 cc 00 0c 29 a8 f8 c0 08 00 45 00  .PV.....).....E.
    0010   00 e2 2a 19 40 00 80 06 d0 55 c0 a8 cb 85 3a e1  ..*. at ....U....:.
    0020   38 98 05 f3 15 9a b9 86 62 7b 0d ab 0f ba 50 18  8.......b{....P.
    0030   fa f0 26 14 00 00 50 54 3f 09 a2 91 7f 13 00 00  ..&...PT?.......
    0040   00 1f 14 00 02 00 00 00 00 00 00 00 07 00 00 00  ................
    0050   61 61 61 61 61 61 61 50 54 3f 09 a2 91 7f 8b 00  aaaaaaaPT?......
    0060   00 00 1f 15 00 08 00 00 00 07 00 00 00 61 61 61  .............aaa
    0070   61 61 61 61 07 00 00 00 62 62 62 62 62 62 62 01  aaaa....bbbbbbb.
    0080   00 00 00 31 02 00 00 00 4b 52 0f 00 00 00 31 39  ...1....KR....19
    0090   32 2e 31 36 38 2e 32 30 33 2e 31 33 33 30 00 00  2.168.203.1330..
    00a0   00 4d 69 63 72 6f 73 6f 66 74 20 57 69 6e 64 6f  .Microsoft Windo
    00b0   77 73 20 58 50 20 50 72 6f 66 65 73 73 69 6f 6e  ws XP Profession
    00c0   61 6c 20 53 65 72 76 69 63 65 20 50 61 63 6b 20  al Service Pack 
    00d0   32 14 00 00 00 31 30 30 31 33 30 30 35 33 31 35  2....10013005315
    00e0   37 38 33 37 32 30 31 32 33 03 00 00 00 34 37 30  783720123....470
    
    0000   00 0c 29 a8 f8 c0 00 50 56 f2 c8 cc 08 00 45 00  ..)....PV.....E.
    0010   00 28 ae 37 00 00 80 06 8c f1 3a e1 38 98 c0 a8  .(.7......:.8...
    0020   cb 85 15 9a 05 f3 0d ab 0f ba b9 86 63 35 50 10  ............c5P.
    0030   fa f0 5f 8e 00 00 00 00 00 00 00 00              .._.........
    
    0000   00 0c 29 a8 f8 c0 00 50 56 f2 c8 cc 08 00 45 00  ..)....PV.....E.
    0010   00 4c ae 38 00 00 80 06 8c cc 3a e1 38 98 c0 a8  .L.8......:.8...
    0020   cb 85 15 9a 05 f3 0d ab 0f ba b9 86 63 35 50 18  ............c5P.
    0030   fa f0 3e 75 00 00 50 54 3f 09 a2 91 7f 16 00 00  ..>u..PT?.......
    0040   00 1f 18 00 01 00 00 00 0e 00 00 00 55 73 65 72  ............User
    0050   20 4e 6f 74 20 46 6f 75 6e 64                     Not Found


-- 
View this message in context: http://old.nabble.com/python-socket-service-related-question%21-tp27743609p27743609.html
Sent from the Python - python-list mailing list archive at Nabble.com.



From victorsubervi at gmail.com  Mon Mar  1 09:02:56 2010
From: victorsubervi at gmail.com (Victor Subervi)
Date: Mon, 1 Mar 2010 10:02:56 -0400
Subject: Permission Problem
Message-ID: <4dc0cfea1003010602w755b52feu2e7f9dca710ff71@mail.gmail.com>

Hi;
I encountered and solved this problem before with the help of the list, but
it's back, and I've reviewed and done everything I was shown to do last
time, so I'm lost. Here's the script:

#!/usr/bin/python

import cgitb; cgitb.enable()
import cgi
import sys,os
sys.path.append(os.getcwd())
from login import login
import MySQLdb
import re, string
import fpformat

form = cgi.FieldStorage()
width = form.getfirst('width')
lines = '''
#!/usr/bin/python

return %s''' % width
f = 'width.py'
try:
  os.remove(f)
except OSError:
  pass
f = open(f, 'w')
f.writelines(lines)
f.close()

Simple enough. Here's the permissions:

drwxrwxrwx 31 root root   4096 Feb 23 04:57 ..
-rwxrwxrwx  1 root root    390 Mar  1 05:52 preload.py

All loaded up deliberately to try and get it to work. Here's the error:

 /var/www/html/globalsolutionsgroup.vi/preload.py
   21 except OSError:
   22   pass
   23 f = open(f, 'w')
   24 f.writelines(lines)
   25 f.close()
f = 'width.py', builtin open = <type 'file'>
IOError: [Errno 13] Permission denied: 'width.py'
      args = (13, 'Permission denied')
      errno = 13
      filename = 'width.py'
      strerror = 'Permission denied'

What'd I do wrong?
TIA,
beno

-- 
The Logos has come to bear
http://logos.13gems.com/
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From urbangabo at gmail.com  Mon Mar  1 09:05:03 2010
From: urbangabo at gmail.com (Gabor Urban)
Date: Mon, 1 Mar 2010 15:05:03 +0100
Subject: Class attributes / methods lost?
Message-ID: <f7ac28aa1003010605t38d72d42n4af5008878a1c921@mail.gmail.com>

Hi guys,

I am building a nested data structure with the following compontens:

<>

class Item:
    def __init__(self, pId, pChange, pComment):
        self.ID = pId
        self.Delta = pChange
        self.Comment = pComment

    def PrintItem(self):
        str = '%s,%s,%s'%(self.ID,self.Delta,self.comment)
        return str

class Package:
    def __init__(self, pSerial, pDate, pOwner, pSchema):
        self.serial = pSerial
        self.date = pDate
        self.owner = pOwner
        self.schema = pSchema
        self.items = []

    def insertItem(self, pItem):
        self.items.append(pItem)

    def printPackage(self):
        lines = []
        str = '%s,%s,%s,%s'%(self.serial,self.date,self.owner,self.schema)
        number = self.items.length
        for idx in xrange(number):
            line = ''
            istr = self.items[idx].PrintItem()
            line = str + ',' + istr
            lines.append(line)
        return lines

<>

The above structure is processed with next code:

<>

size = len(packages)
package = None
for index in xrange(size):
    logger.info('PrettyPrinting package id=%d',index)
    oplines = []
    oplines = packages[index].printPackage()
    for i in xrange(oplines.length):
        data.append(oplines[i])
<>

I've got the next error message:
' Traceback (most recent call last):
  File "XmlHistory_orig.py", line 203, in ?
    oplines = packages[index].printPackage()
TypeError: unbound method printPackage() must be called with Package
instance as first argument (got nothing instead) '

I did give a try to access the fields directly

<>
packages = []
data = []

size = len(packages)
for index in xrange(size):
    str = '%s,%s,%s,%s'%(packages[index].serial,packages[index].date,packages[index].owner,packages[index].schema)
    itemnum = len(packages[index].items)
    oplines = []
    for itemIndx in xrange(itemnum):
        element =
'%s,%s,%s'%(packages[index].items[itemIdx].ID,packages[index].items[itemIdx].Delta,packages[index].items[itemIdx].comment)
        oplines.append(str + ','+elemt)

<>

Error:

Traceback (most recent call last):
  File "XmlHistory.py", line 204, in ?
    str = '%s,%s,%s,%s'%(packages[index].serial,packages[index].date,packages[index].owner,packages[index].schema)
AttributeError: class Package has no attribute 'serial'

The strange in this issue for me, that I do not see why are the class
methods and fields lost.

Any idea is wellcome.

Gabor
-- 
Linux: Choice of a GNU Generation


From __peter__ at web.de  Mon Mar  1 09:24:37 2010
From: __peter__ at web.de (Peter Otten)
Date: Mon, 01 Mar 2010 15:24:37 +0100
Subject: Class attributes / methods lost?
References: <mailman.51.1267452306.23598.python-list@python.org>
Message-ID: <hmgimc$59u$00$1@news.t-online.com>

Gabor Urban wrote:

> I am building a nested data structure with the following compontens:

<snip>

> Any idea is wellcome.

The error messages suggest that you are using classes where you should be 
using class instances, but you don't provide the code where this problem 
originates.

The code you do give looks like a very literal and incomplete conversion 
from Java. Rather than go into the details I suggest that you have a look at 
the Tutorial (and PEP 8) before you proceed.

http://docs.python.org/tutorial/index.html
http://www.python.org/dev/peps/pep-0008/

Peter




From nanyaks at googlemail.com  Mon Mar  1 09:42:28 2010
From: nanyaks at googlemail.com (simn_stv)
Date: Mon, 1 Mar 2010 06:42:28 -0800 (PST)
Subject: taking python enterprise level?...
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<mailman.233.1267106234.4577.python-list@python.org>
	<hm650q$esk$1@news.eternal-september.org> 
	<mailman.244.1267114628.4577.python-list@python.org>
	<7uohugFedhU1@mid.uni-berlin.de> 
	<mailman.257.1267156817.4577.python-list@python.org>
	<7upi0jFuapU2@mid.uni-berlin.de>
Message-ID: <7f8b1651-69fc-4ae1-8f55-840ff9f9d1dc@15g2000yqa.googlegroups.com>

On Feb 26, 10:19 am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> Am 26.02.10 05:01, schrieb D'Arcy J.M. Cain:
>
>
>
> > On Fri, 26 Feb 2010 01:12:00 +0100
> > "Diez B. Roggisch"<de... at nospam.web.de>  wrote:
> >>> That better way turned out to asynchronous update transactions.  All we
> >>> did was keep feeding updates to the remote site and forget about ACKS.
> >>> We then had a second process which handled ACKS and tracked which
> >>> packets had been properly transferred.  The system had IDs on each
> >>> update and retries happened if ACKS didn't happen soon enough.
> >>> Naturally we ignored ACKS that we had already processed.
>
> >> sounds like using UDP to me, of course with a protocol on top (namely
> >> the one you implemented).
>
> >> Any reason you sticked to TCP instead?
>
> > TCP does a great job of delivering a stream of data in order and
> > handling the retries.  The app really was connection oriented and we
> > saw no reason to emulate that over an unconnected protocol.  There were
> > other wheels to reinvent that were more important.
>
> So when you talk about ACKs, you don't mean these on the TCP-level
> (darn, whatever iso-level that is...), but on some higher level?
>
> Diez

i think its on the TCP that he's referring to or is it?...
if it is, that means he's doing some 'mean' network level scripting,
impressive...but i never thought python could go that deep in network
programming!...


From darcy at druid.net  Mon Mar  1 09:43:13 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Mon, 1 Mar 2010 09:43:13 -0500
Subject: taking python enterprise level?...
In-Reply-To: <e64e9273-6d28-4a94-b337-ce5e019e4ea6@z35g2000yqd.googlegroups.com>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<mailman.233.1267106234.4577.python-list@python.org>
	<hm650q$esk$1@news.eternal-september.org>
	<mailman.244.1267114628.4577.python-list@python.org>
	<e64e9273-6d28-4a94-b337-ce5e019e4ea6@z35g2000yqd.googlegroups.com>
Message-ID: <20100301094313.e04eab06.darcy@druid.net>

On Mon, 1 Mar 2010 04:11:07 -0800 (PST)
simn_stv <nanyaks at googlemail.com> wrote:
> > All of the above (and much more complexity not even discussed here) was
> > handled by Python code and database manipulation.  There were a few
> > bumps along the way but overall it worked fine.  If we were using C or
> > even assembler we would not have sped up anything and the solution we
> > came up with would have been horrendous to code.  As it was I and my
> > chief programmer locked ourselves in the boardroom and had a working
> > solution before the day was out.
> 
> sure it wouldnt have sped it up a bit, even a bit?; probably the
> development and maintenance time would be a nightmare but it should
> speed the app up a bit...

What do you mean by "even a bit?"  The bulk of the time is in sending
bits on the wire.  Computer time was always negligible in this
situation.  Yes, I can write all of my applications in assembler to get
a 0.00000000000001% increase in speed but who cares?

If you have decent algorithms in place then 99% of the time I/O will be
your bottleneck and if it isn't then you have a compute heavy problem
that assembler isn't going to fix.

And even if I get a 100% increase in speed, I still lose.  Computer
time is cheaper than programmer time by so many orders of magnitude
that it isn't even worh factoring in the speedup.

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


From darcy at druid.net  Mon Mar  1 10:02:15 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Mon, 1 Mar 2010 10:02:15 -0500
Subject: taking python enterprise level?...
In-Reply-To: <7f8b1651-69fc-4ae1-8f55-840ff9f9d1dc@15g2000yqa.googlegroups.com>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<mailman.233.1267106234.4577.python-list@python.org>
	<hm650q$esk$1@news.eternal-september.org>
	<mailman.244.1267114628.4577.python-list@python.org>
	<7uohugFedhU1@mid.uni-berlin.de>
	<mailman.257.1267156817.4577.python-list@python.org>
	<7upi0jFuapU2@mid.uni-berlin.de>
	<7f8b1651-69fc-4ae1-8f55-840ff9f9d1dc@15g2000yqa.googlegroups.com>
Message-ID: <20100301100215.a9387aa4.darcy@druid.net>

On Mon, 1 Mar 2010 06:42:28 -0800 (PST)
simn_stv <nanyaks at googlemail.com> wrote:
> On Feb 26, 10:19 am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
> > So when you talk about ACKs, you don't mean these on the TCP-level
> > (darn, whatever iso-level that is...), but on some higher level?
> 
> i think its on the TCP that he's referring to or is it?...

No, I mean in our own application layer.

> if it is, that means he's doing some 'mean' network level scripting,
> impressive...but i never thought python could go that deep in network
> programming!...

What I meant was that we just keep sending packets which TCP/IP keeps
in order for us by reassembling out-of-order and retransmitted
packets.  Asynchronously we sent back to our own application an ACK
that our app level packet was finally received.  It's a sliding window
protocol.  http://en.wikipedia.org/wiki/Sliding_Window_Protocol

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


From victorsubervi at gmail.com  Mon Mar  1 10:07:52 2010
From: victorsubervi at gmail.com (Victor Subervi)
Date: Mon, 1 Mar 2010 11:07:52 -0400
Subject: Permission Problem
In-Reply-To: <4dc0cfea1003010602w755b52feu2e7f9dca710ff71@mail.gmail.com>
References: <4dc0cfea1003010602w755b52feu2e7f9dca710ff71@mail.gmail.com>
Message-ID: <4dc0cfea1003010707j872922ckd30d62173e831c6e@mail.gmail.com>

Never mind. I figured out my error.
beno

On Mon, Mar 1, 2010 at 10:02 AM, Victor Subervi <victorsubervi at gmail.com>wrote:

> Hi;
> I encountered and solved this problem before with the help of the list, but
> it's back, and I've reviewed and done everything I was shown to do last
> time, so I'm lost. Here's the script:
>
> #!/usr/bin/python
>
> import cgitb; cgitb.enable()
> import cgi
> import sys,os
> sys.path.append(os.getcwd())
> from login import login
> import MySQLdb
> import re, string
> import fpformat
>
> form = cgi.FieldStorage()
> width = form.getfirst('width')
> lines = '''
> #!/usr/bin/python
>
> return %s''' % width
> f = 'width.py'
> try:
>   os.remove(f)
> except OSError:
>   pass
> f = open(f, 'w')
> f.writelines(lines)
> f.close()
>
> Simple enough. Here's the permissions:
>
> drwxrwxrwx 31 root root   4096 Feb 23 04:57 ..
> -rwxrwxrwx  1 root root    390 Mar  1 05:52 preload.py
>
> All loaded up deliberately to try and get it to work. Here's the error:
>
>  /var/www/html/globalsolutionsgroup.vi/preload.py
>    21 except OSError:
>    22   pass
>    23 f = open(f, 'w')
>    24 f.writelines(lines)
>    25 f.close()
> f = 'width.py', builtin open = <type 'file'>
> IOError: [Errno 13] Permission denied: 'width.py'
>       args = (13, 'Permission denied')
>       errno = 13
>       filename = 'width.py'
>       strerror = 'Permission denied'
>
> What'd I do wrong?
> TIA,
> beno
>
> --
> The Logos has come to bear
> http://logos.13gems.com/
>



-- 
The Logos has come to bear
http://logos.13gems.com/
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From jeanmichel at sequans.com  Mon Mar  1 10:09:22 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 01 Mar 2010 16:09:22 +0100
Subject: Class attributes / methods lost?
In-Reply-To: <f7ac28aa1003010605t38d72d42n4af5008878a1c921@mail.gmail.com>
References: <f7ac28aa1003010605t38d72d42n4af5008878a1c921@mail.gmail.com>
Message-ID: <4B8BD8A2.40800@sequans.com>

Gabor Urban wrote:
> Hi guys,
>
> I am building a nested data structure with the following compontens:
>
> <>
>
> class Item:
>     def __init__(self, pId, pChange, pComment):
>         self.ID = pId
>         self.Delta = pChange
>         self.Comment = pComment
>
>     def PrintItem(self):
>         str = '%s,%s,%s'%(self.ID,self.Delta,self.comment)
>         return str
>
> class Package:
>     def __init__(self, pSerial, pDate, pOwner, pSchema):
>         self.serial = pSerial
>         self.date = pDate
>         self.owner = pOwner
>         self.schema = pSchema
>         self.items = []
>
>     def insertItem(self, pItem):
>         self.items.append(pItem)
>
>     def printPackage(self):
>         lines = []
>         str = '%s,%s,%s,%s'%(self.serial,self.date,self.owner,self.schema)
>         number = self.items.length
>         for idx in xrange(number):
>             line = ''
>             istr = self.items[idx].PrintItem()
>             line = str + ',' + istr
>             lines.append(line)
>         return lines
>
> <>
>
> The above structure is processed with next code:
>
> <>
>
> size = len(packages)
> package = None
> for index in xrange(size):
>     logger.info('PrettyPrinting package id=%d',index)
>     oplines = []
>     oplines = packages[index].printPackage()
>     for i in xrange(oplines.length):
>         data.append(oplines[i])
> <>
>
> I've got the next error message:
> ' Traceback (most recent call last):
>   File "XmlHistory_orig.py", line 203, in ?
>     oplines = packages[index].printPackage()
> TypeError: unbound method printPackage() must be called with Package
> instance as first argument (got nothing instead) '
>
> I did give a try to access the fields directly
>
> <>
> packages = []
> data = []
>
> size = len(packages)
> for index in xrange(size):
>     str = '%s,%s,%s,%s'%(packages[index].serial,packages[index].date,packages[index].owner,packages[index].schema)
>     itemnum = len(packages[index].items)
>     oplines = []
>     for itemIndx in xrange(itemnum):
>         element =
> '%s,%s,%s'%(packages[index].items[itemIdx].ID,packages[index].items[itemIdx].Delta,packages[index].items[itemIdx].comment)
>         oplines.append(str + ','+elemt)
>
> <>
>
> Error:
>
> Traceback (most recent call last):
>   File "XmlHistory.py", line 204, in ?
>     str = '%s,%s,%s,%s'%(packages[index].serial,packages[index].date,packages[index].owner,packages[index].schema)
> AttributeError: class Package has no attribute 'serial'
>
> The strange in this issue for me, that I do not see why are the class
> methods and fields lost.
>
> Any idea is wellcome.
>
> Gabor
>   
Ok here are some suggestions :

1/ do not name a method PrintItem if the method does not print anything 
(it does not)
2/ use the __str__ method to return a nice representation of your objects
3/ use pythonic iteration controls
4/ be consistant with your naming convention, your Item's attributes 
start with an Uppercase letter, Package's attributes with a lowercase 
one. (I suggest the lowercase)


class Item(object):
    def __init__(self, pId, pChange, pComment):
        self.id = pId
        self.delta = pChange
        self.comment = pComment

    def __str__(self):
        return self.__class__.__name__ + ':' + str(self.__dict__)

class Package(object):
    def __init__(self, pSerial, pDate, pOwner, pSchema):
        self.serial = pSerial
        self.date = pDate
        self.owner = pOwner
        self.schema = pSchema
        self.items = []

    def insertItem(self, pItem):
        self.items.append(pItem)

    def __str__(self):
        _dict = self.__dict__.copy()
        _dict['items'] = [str(item) for item in self.items]
        return self.__class__.__name__ + ':' + str(_dict)

i1 = Item('a', 'b', 'c')
i2 = Item('foo', 'bar', 'baz')
p = Package(1,2,3,4)
p.insertItem(i1)
p.insertItem(i2)
packages = [p]

for package in packages:
    print package

 >>> Package:{'date': 2, 'owner': 3, 'serial': 1, 'schema': 4, 'items': 
["Item:{'comment': 'c', 'id': 'a', 'delta': 'b'}", "Item:{'comment': 
'baz', 'id': 'foo', 'delta': 'bar'}"]}

Regarding the error you get, it seems you've stored the class itself, 
instead instances.
The error should be in the way you've built the package list, but you 
did not provide the code.

JM



From python at mrabarnett.plus.com  Mon Mar  1 10:17:14 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Mon, 01 Mar 2010 15:17:14 +0000
Subject: Docstrings considered too complicated
In-Reply-To: <4B8B9845.70604@sequans.com>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>
	<4B89D8BE.2040905@mrabarnett.plus.com> <4B8B9845.70604@sequans.com>
Message-ID: <4B8BDA7A.3060600@mrabarnett.plus.com>

Jean-Michel Pichavant wrote:
> MRAB wrote:
>> Gregory Ewing wrote:
>>> Mel wrote:
>>>
>>>> You could think of it as a not bad use of the design principle 
>>>> "Clear The Simple Stuff Out Of The Way First".  Destinations are 
>>>> commonly a lot simpler than sources
>>>
>>> That's not usually true in assembly languages, though,
>>> where the source and destination are both very restricted
>>> and often about the same complexity.
>>>
>>> That's not to say that right-to-left is the wrong way
>>> to do it in an assembly language, but there are less
>>> misleading words than "move" that could be used.
>>>
>>> Z80 assembly language uses "load", which makes things
>>> considerably clearer:
>>>
>>>   LD A, B  ; load A with B
>>>
>> Some processors distinguish between "load" (memory to register) and
>> "store" (register to memory), and the destination and LHS operand of
>> binary operations might be the same register, for example:
>>
>>     CLC ; clear the carry
>>     LDA first ; accumulator := byte at first
>>     ADCA second ; accumulator := accumulator + byte at second + carry
>>     STA result ; byte at third := accumulator
>>
> Guys, you sound like people arguing about old school TV show / series 
> like star treck :-)
> - "He was wearing a blue suit !"
> - "Check episode number 29, he appeared with a pink one!"
> 
> I'm glad I'm too young to had to code in assembler, or to bear the 
> vision of those unlikely space suits from the 70's ;-)
> 
Ah, yes, Star Trek (the original series).

If they transported down to a planet and there was a man in a red shirt
who you'd never seen before, he'd be the one to die! :-)

BTW, the first programming I did was in hexadecimal (C4xx was "LDI xx").


From greg.lindstrom at novasyshealth.com  Mon Mar  1 10:19:57 2010
From: greg.lindstrom at novasyshealth.com (Greg Lindstrom)
Date: Mon, 01 Mar 2010 09:19:57 -0600
Subject: Looking for an Application
Message-ID: <4B8BDB1D.2050309@novasyshealth.com>

A few months ago there was a post dealing with an application that would 
power scripts based on graphical snippets of the screen.  Essentially, 
the script would "look" for a match with what you pasted into it.  I 
don't recall the name of the application, but would like to try it.  
Does anyone remember what it is?

Thanks,
--greg




From arjun.chennu at gmail.com  Mon Mar  1 10:35:38 2010
From: arjun.chennu at gmail.com (Arjun Chennu)
Date: Mon, 1 Mar 2010 16:35:38 +0100
Subject: How to end TCP socket data while using readline()?
In-Reply-To: <20100227041115.GA24869@cskk.homeip.net>
References: <273a2d1e-cff5-4759-a59d-6ccfefddfa40@e1g2000yqh.googlegroups.com>
	<20100227041115.GA24869@cskk.homeip.net>
Message-ID: <db4a45821003010735h361cd25s5624ca817a98835e@mail.gmail.com>

Thanks for the feedback.

Opening a separate file-obj for writing and for reading is just what I've
been trying, but I don't seem to get it to work. I'm new to python and I'm
not sure if I'm missing the intricacy of some command. Please help:

Here is my server snippet:

            (conn, addr) = sock1.accept()    # connected socket
            print 'Client (localhost) port: ', addr[1]

            cf = conn.makefile('r',0)    # file obj for reading
            lf = open('ccs.txt','w')

            for linenum, line in enumerate(cf):    # iterate over socket
lines
                lf.write(line)
                #sys.stdout.write(line)
                print len(line)

            cf.close()

            stat = 'wrote %s lines to file.\n' %(linenum+1)
            cff = conn.makefile('w',0)   # file obj for writing
            cff.writelines(stat)      # cff.write(stat) does not work
either!!
            cff.close()

            lf.close()
            conn.close()
            print stat, "DONE!"

And here is the client that I have for it:  (sfp is the local file object i
read from)

        for line in sfp.readlines():
            cf.write(line)
            print len(line)

        print 'done sending'
        cf.close()   #writing ends here

        cff = s.makefile('r',0)   # file obj for writing
        for line in cff.readlines():
            print line

        cff.close()

        sfp.close()
        s.close()

The execution sends all the lines (and prints out the len(line) ) and then
stays waiting. THen when I manually terminate the client script, the server
script happily types the "DONE!" output.

Where is this protocol hanging up? Help much appreciated, with a small
explanation.

Cheers,
Arjun

On Sat, Feb 27, 2010 at 05:11, Cameron Simpson <cs at zip.com.au> wrote:

> On 26Feb2010 10:39, Arjun <arjun.chennu at gmail.com> wrote:
> | Hi, I have a small script that runs a TCP server. A client connects to
> | this server and transmits a stored file line-by-line, and then waits
> | for a confirmation "done". However, when I run them the first loop
> | never really ends -- as the TCP server keeps expecting more data. I am
> | using a file-like-object, and so somehow I have to communicate to the
> | server that it is the end-of-file.
> |
> | here is some server code
> | <snip>
> |             sock1.bind(('', port))
> |             print "Listening at port: ", port
> |             sock1.listen(1)      # listening socket
> |             (conn, addr) = sock1.accept()    # connected socket
> |             print 'Client (localhost) port: ', addr[1]
> |
> |             cf = conn.makefile('r',0)    # file like obj for socket
> [...]
> |         print 'close'
> |         cf.flush()
> |         cf.close()
> |         sfp.close()
> [...]
>
> Too many files. It's not that hard! Or shouldn't be.
>
> | So what I am wondering is:
> |
> | 1. Using a file-like object means that the socket becomes uni-
> | directional, until the mode of the file object is changed from 'r' to
> | 'w' (or vice versa). This seems inefficient, and rather unPythonesque.
> | Can somebody tell me if there is a more elegant way of receiving all
> | the lines from the client, and then sending a "done" message to the
> | client?
>
> Get the socket. It is a file descriptor (or in may be a python "socket"
> object with a file descriptor inside).
>
> Open _two_ "file" objects on it using
>  from_file = os.fdopen(fd_of_socket, "r")
>  to_file = os.fdopen(fd_of_socket, "w").
>
> Use the same:
>  print >>to_file, 'close'
>  to_file.flush()
> method as you're using already.
> Read from to_file as needed.
>
> The same scheme should work in both server and client:
>
> Don't look for EOF, watch the input line flow.
>
> You might need to use readline() instead of the file-by-line iteration
> stuff,
> which I seem to recall has some sort of problem handing out the "latest"
> line.
>
> Cheers,
> --
> Cameron Simpson <cs at zip.com.au> DoD#743
> http://www.cskk.ezoshosting.com/cs/
>
> It's better, when you're riding with someone you don't know so well, to
> stick
> to the inside line - it's easier to avoid the bits...
>        - Barry Sheene
>
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From arjun.chennu at gmail.com  Mon Mar  1 10:53:10 2010
From: arjun.chennu at gmail.com (Arjun Chennu)
Date: Mon, 1 Mar 2010 16:53:10 +0100
Subject: How to end TCP socket data while using readline()?
In-Reply-To: <db4a45821003010735h361cd25s5624ca817a98835e@mail.gmail.com>
References: <273a2d1e-cff5-4759-a59d-6ccfefddfa40@e1g2000yqh.googlegroups.com>
	<20100227041115.GA24869@cskk.homeip.net>
	<db4a45821003010735h361cd25s5624ca817a98835e@mail.gmail.com>
Message-ID: <db4a45821003010753yfa269cfwaae8915c60003055@mail.gmail.com>

It DOES seem like only when the connection socket is closed via conn.close()
that the data is flushed and the 'waiting' ends. So with the earlier
suggestion that I open one file-obj for reading and one for writing, I still
cannot acheive two-way communication because I need to close the connection
for it to actually occur completely!

My client waits after the "done sending" line indefinitely. Weird.

A

On Mon, Mar 1, 2010 at 16:35, Arjun Chennu <arjun.chennu at gmail.com> wrote:

> Thanks for the feedback.
>
> Opening a separate file-obj for writing and for reading is just what I've
> been trying, but I don't seem to get it to work. I'm new to python and I'm
> not sure if I'm missing the intricacy of some command. Please help:
>
> Here is my server snippet:
>
>
>             (conn, addr) = sock1.accept()    # connected socket
>             print 'Client (localhost) port: ', addr[1]
>
>             cf = conn.makefile('r',0)    # file obj for reading
>
>             lf = open('ccs.txt','w')
>
>             for linenum, line in enumerate(cf):    # iterate over socket
> lines
>                 lf.write(line)
>                 #sys.stdout.write(line)
>                 print len(line)
>
>             cf.close()
>
>             stat = 'wrote %s lines to file.\n' %(linenum+1)
>             cff = conn.makefile('w',0)   # file obj for writing
>             cff.writelines(stat)      # cff.write(stat) does not work
> either!!
>             cff.close()
>
>             lf.close()
>             conn.close()
>             print stat, "DONE!"
>
> And here is the client that I have for it:  (sfp is the local file object i
> read from)
>
>
>         for line in sfp.readlines():
>             cf.write(line)
>             print len(line)
>
>         print 'done sending'
>         cf.close()   #writing ends here
>
>         cff = s.makefile('r',0)   # file obj for writing
>         for line in cff.readlines():
>             print line
>
>         cff.close()
>
>         sfp.close()
>         s.close()
>
> The execution sends all the lines (and prints out the len(line) ) and then
> stays waiting. THen when I manually terminate the client script, the server
> script happily types the "DONE!" output.
>
> Where is this protocol hanging up? Help much appreciated, with a small
> explanation.
>
> Cheers,
> Arjun
>
>
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From pmaupin at gmail.com  Mon Mar  1 11:08:35 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 08:08:35 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
Message-ID: <bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>

On Feb 28, 9:18?pm, Steven D'Aprano > Wait a minute... if JSON is too
hard to edit, and RSON is a *superset* of
> JSON, that means by definition every JSON file is also a valid RSON file.
> Since JSON is too hard to manually edit, so is RSON.

Well, Python is essentially a superset of JSON, with string escape
handling being ever so slightly different, and using True instead of
true, False instead of false, and None instead of null.  YMMV, but I
find it possible, even probable, to write Python that is far easier to
edit than JSON, and in fact, I have used Python for configuration
files that are only to be edited by programmers or other technical
types.

> Come back when you actually have MANY users other than yourself using
> this is real-world projects. Until then, it is too early to even consider
> adding it the std library. Python comes with batteries included, but not
> experimental batteries that aren't even built yet, let alone proven that
> they work.

I know that it is too early to be included in the library.  But there
is a chicken-and-egg problem.  PEP 1 says you should circulate a
design for discussion before writing code...

I fully expect this sort of negative feedback, fully expect that it
will be years (if ever) before the code makes it into the standard
library, and yet I offer the design for your perusal, just on the slim
chance that I might get a few constructive criticisms on the actual
design to go along with all the silly strawmen reductio ad absurdum
arguments by people who aren't even going to bother to read the thing.

Best regards,
Pat


From qtrimble at gmail.com  Mon Mar  1 11:15:19 2010
From: qtrimble at gmail.com (qtrimble)
Date: Mon, 1 Mar 2010 08:15:19 -0800 (PST)
Subject: loop through each line in a text file
References: <3484373a-2045-428e-9040-abdfecd95e25@f35g2000yqd.googlegroups.com>
	<07a7edd4-9e72-4425-865b-f475c2050ea7@z11g2000yqz.googlegroups.com> 
	<22084c82-0f69-46b0-883f-ef1d3c47d792@o3g2000yqb.googlegroups.com> 
	<121bb934-6d62-482a-a5c2-848668ce237d@q16g2000yqq.googlegroups.com>
Message-ID: <e768164e-aecc-4599-99b1-82dabd45ed1d@t20g2000yqe.googlegroups.com>

On Feb 26, 6:19?pm, ru... at yahoo.com wrote:
> On Feb 26, 2:21?pm, qtrimble <qtrim... at gmail.com> wrote:
>
>
>
> > On Feb 26, 4:14?pm, OdarR <olivier.da... at gmail.com> wrote:
> > <snip>
> > > > below is just a sample. ?There are well over 500,000 lines that need
> > > > processed.
>
> > > > wer1999001
> > > > ? ? ? 31.2234 ? ? ?82.2367
> > > > ? ? ? 37.9535 ? ? ?82.3456
> > > > wer1999002
> > > > ? ? ? 31.2234 ? ? ?82.2367
> > > > ? ? ? 37.9535 ? ? ?82.3456
>
> > > did you try something as a working basis ?
>
> > > Olivier
>
> > Yes but it's very simple -
>
> > fileIN = open(r"C:\testing.txt", "r")
>
> > for line in fileIN:
> > ? ? year = line[3:7]
> > ? ? day = line[7:10]
> > ? ? print year, day
>
> > This is good since i can get the year and day of year into a variable
> > but I haven't gotten any further.
>
> How about something like (untested):
>
> ? for line in fileIN:
> ? ? ? ?if line.startswith ("wer"):
> ? ? ? ? ? ?year = line[3:7]
> ? ? ? ? ? ?day = line[7:10]
> ? ? ? ? else:
> ? ? ? ? ? ?print "%s-%s %s" % (year, day, line.strip())
>
> You can adjust the details as needed...

Thanks to all of you for your suggestions.

This is what I have now.  It may not be the most efficient or well
written script but it works!  Thanks again!

fileIN = open(r"C:\z_paul\ims1999.txt", "r")

for line in fileIN:
    if line.startswith("ims"):
        year = line[3:7]
        day = line[7:10]
        newfile = file(r"C:\z_paul\output\ims" + year + day + ".txt",
"wt")
        newfile.write("YEAR,DOY,Y_COORD,X_COORD,TYPE\n")
    else:
        temp = line.replace('      ',',')
        temp2 = temp.replace(', ',',')
        newfile.write(year + "," + day + temp2)
newfile.close()


From lie.1296 at gmail.com  Mon Mar  1 11:18:30 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Tue, 02 Mar 2010 03:18:30 +1100
Subject: Docstrings considered too complicated
In-Reply-To: <20100301140943.4edca16b@geekmail.INVALID>
References: <20100224212303.242222c6@geekmail.INVALID>	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>	<20100227191040.6c77f2d8@geekmail.INVALID>	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
Message-ID: <4b8be8f7$1@dnews.tpgi.com.au>

On 03/02/10 00:09, Andreas Waldenburger wrote:
> On Mon, 1 Mar 2010 05:01:49 -0800 (PST) alex23 <wuwei23 at gmail.com>
> wrote:
> 
>> Andreas Waldenburger <use... at geekmail.INVALID> wrote:
>>> But as I said: a) I am (we are) not in a position to impose this (We
>>> don't work with the code, we just run the software).
>>
>> I personally believe that the end users have _every_ right to impose
>> quality requirements on  code used within their business...although I
>> may not bring this up in front of them at meetings :)
> 
> Huh? That's like demanding a certain type of truck or vehicle
> maintenance plan from a trucking company. Sure, you *could* do it, but
> that effectively only limits your options. I think there should be a
> clear separation of concerns here.

If my truck contains food items that spoils quickly, I would want to
make sure that the trucking company takes good care of their
refrigeration system and that the truck have as little chance as
possible for breakdown due to poor maintenance.


From tibor.beck at hotmail.com  Mon Mar  1 11:22:27 2010
From: tibor.beck at hotmail.com (gentlestone)
Date: Mon, 1 Mar 2010 08:22:27 -0800 (PST)
Subject: AOP decorator?
Message-ID: <9437135d-e2f7-4317-a5bd-46346fa5b5fb@q21g2000yqm.googlegroups.com>

Hi,

suppose my source code looks like:
--------------------------------
  import aspect_xy
  class Basic(object, aspect_xy.Basic):
    pass # basic attributes and methods ...
--------------------------------
and the source code of aspect_xy.py is:
--------------------------------
  class Basic(object):
    pass  # aspect extra attributes and methods ...
--------------------------------
how can I write this with decorators? I want something like:
-------------------------------
  import aspect_xy
  @aspect_xy # extra attributes and methods ...
  class Basic(object):
    pass # basic attributes and methods ...
----------------------------------------------------------
I want to write class decorator function, which:
1. Takes the basic class as parameter
2. Find the same class name in aspect_xy.py
3. Inherit the found aspect class
Is it possible?








From pmaupin at gmail.com  Mon Mar  1 11:27:34 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 08:27:34 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<4b8b5cef$0$1625$742ec2ed@news.sonic.net>
Message-ID: <445e1928-b312-4082-8987-494ad2641e5d@y17g2000yqd.googlegroups.com>

On Mar 1, 12:39?am, John Nagle <na... at animats.com> wrote:
> Patrick Maupin wrote:
> > All:
>
> > Finding .ini configuration files too limiting, JSON and XML to hard to
> > manually edit, and YAML too complex to parse quickly, I have started
> > work on a new configuration file parser.
>
> ? ? You're not supposed to edit those formats manually.
>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? John Nagle

Opinions on that will vary, and as the saying goes, "everybody is
entitled to his own opinions, but not his own facts."

I submit as fact that there are many initialization files in each of
these formats, and I would be willing to place a wager that the
majority of the people on this list have used a text editor to modify
at least one file in this category at least once.

IOW, in my opinion (and it is only an opinion, not a fact), you are
actually helping to make the case that a better format is needed.

Regards,
Pat


From anand.shashwat at gmail.com  Mon Mar  1 11:59:52 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Mon, 1 Mar 2010 22:29:52 +0530
Subject: Looking for an Application
In-Reply-To: <4B8BDB1D.2050309@novasyshealth.com>
References: <4B8BDB1D.2050309@novasyshealth.com>
Message-ID: <d4ab53de1003010859xf2be6aeu6246c12d776bfec5@mail.gmail.com>

project sikuli : http://groups.csail.mit.edu/uid/sikuli/

On Mon, Mar 1, 2010 at 8:49 PM, Greg Lindstrom <
greg.lindstrom at novasyshealth.com> wrote:

> A few months ago there was a post dealing with an application that would
> power scripts based on graphical snippets of the screen.  Essentially, the
> script would "look" for a match with what you pasted into it.  I don't
> recall the name of the application, but would like to try it.  Does anyone
> remember what it is?
>
> Thanks,
> --greg
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From noamraph at gmail.com  Mon Mar  1 12:07:15 2010
From: noamraph at gmail.com (Noam Yorav-Raphael)
Date: Mon, 1 Mar 2010 09:07:15 -0800 (PST)
Subject: DreamPie - The Python shell you've always dreamed about!
References: <6c6a96e0-be08-4ec3-a002-0bb9232a8afd@f29g2000yqa.googlegroups.com>
	<1053124a-8ceb-4804-a7e5-9433acd3f02d@f17g2000prh.googlegroups.com> 
	<mailman.104.1266926192.4577.python-list@python.org>
Message-ID: <edf3d45b-314c-4848-b3a5-1ff91bb076f1@f8g2000yqn.googlegroups.com>

This is most probably a bug discovered in DreamPie 1.0 (See
https://bugs.launchpad.net/dreampie/+bug/525652 )

Can you try to download DreamPie 1.0.1, and if it still happens,
report a bug?

Thanks!
Noam


From noamraph at gmail.com  Mon Mar  1 12:08:28 2010
From: noamraph at gmail.com (Noam Yorav-Raphael)
Date: Mon, 1 Mar 2010 09:08:28 -0800 (PST)
Subject: DreamPie - The Python shell you've always dreamed about!
References: <6c6a96e0-be08-4ec3-a002-0bb9232a8afd@f29g2000yqa.googlegroups.com>
	<7f014ea61002210913p237adec3le0618bc899bd3f9a@mail.gmail.com> 
	<b348a0851002230411s6562c338i2e8529ca6b74e4a2@mail.gmail.com> 
	<mailman.108.1266931509.4577.python-list@python.org>
Message-ID: <f7405dcb-f6e1-4f43-a7e7-761da543658d@c16g2000yqd.googlegroups.com>

Can you try DreamPie 1.0.1 and say if it still happens?

There's a bug report system at launchpad.net/dreampie.

Thanks,
Noam


From robert.kern at gmail.com  Mon Mar  1 12:13:37 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Mon, 01 Mar 2010 11:13:37 -0600
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
Message-ID: <hmgskj$3h3$1@dough.gmane.org>

On 2010-03-01 10:08 , Patrick Maupin wrote:
> On Feb 28, 9:18 pm, Steven D'Aprano

>> Come back when you actually have MANY users other than yourself using
>> this is real-world projects. Until then, it is too early to even consider
>> adding it the std library. Python comes with batteries included, but not
>> experimental batteries that aren't even built yet, let alone proven that
>> they work.
>
> I know that it is too early to be included in the library.  But there
> is a chicken-and-egg problem.  PEP 1 says you should circulate a
> design for discussion before writing code...

Ignore it. That comment really doesn't apply to this case. That's for things 
that only make sense in the language or standard library, like context managers. 
For libraries like this, Steven's summary is correct. It needs to have a useful 
life as a third party package for a few years before you should propose it for 
inclusion into the standard library. By all means, distribute a design document 
for comment before you implement things; it's a reasonable practice. But don't 
bother with a PEP yet.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From arnodel at googlemail.com  Mon Mar  1 12:15:23 2010
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Mon, 01 Mar 2010 17:15:23 +0000
Subject: Looking for an Application
References: <mailman.62.1267462298.23598.python-list@python.org>
Message-ID: <m2mxysrmj8.fsf@googlemail.com>

Greg Lindstrom <greg.lindstrom at novasyshealth.com> writes:

> A few months ago there was a post dealing with an application that
> would power scripts based on graphical snippets of the screen.
> Essentially, the script would "look" for a match with what you pasted
> into it.  I don't recall the name of the application, but would like
> to try it.  Does anyone remember what it is?
>
> Thanks,
> --greg

Project SIKULI?

http://groups.csail.mit.edu/uid/sikuli/

-- 
Arnaud


From rantingrick at gmail.com  Mon Mar  1 12:18:12 2010
From: rantingrick at gmail.com (rantingrick)
Date: Mon, 1 Mar 2010 09:18:12 -0800 (PST)
Subject: Sample code usable Tkinter listbox
References: <hmf1qo$v9v$1@news.eternal-september.org>
	<5af8af6d-ecfc-4e4e-bba6-3622bbe874eb@o3g2000yqb.googlegroups.com>
	<hmfdvg$vu8$1@news.eternal-september.org>
	<0f801cb4-20fc-4955-bdf6-ec7a2bc5cecb@g19g2000yqe.googlegroups.com>
	<hmgbco$blv$1@news.eternal-september.org>
Message-ID: <a276c44c-d107-4d15-b05c-a16724defabf@q16g2000yqq.googlegroups.com>

On Mar 1, 6:19?am, "Alf P. Steinbach" <al... at start.no> wrote:

> > ? ? ? ? kw.setdefault('activestyle', 'none')
>
> Hm, let me steal this line... Thanks!

Yes! the default activestyle is quite annoying!


From mmitchell at transparent.com  Mon Mar  1 12:20:30 2010
From: mmitchell at transparent.com (Matt Mitchell)
Date: Mon, 1 Mar 2010 12:20:30 -0500
Subject: Is there a better way to do this?
Message-ID: <E3F00F47584F1944B69461EF94D1A74909F71CC4@transparent3.transparent.local>

Hi,

I wrote a python script that uses pysvn to export projects from an svn
repo I have.  The repo has hundreds of projects in it with a directory
structure that is pretty uniform however it's not exactly uniform
because of the capitalization.  I.e.:
\root
  \project English
      \Stuff
      \Stuff 2
  \Project Spanish
      \Stuff 3 
      \Stuff 4

My svn repo is case sensitive so if I try to get \root\project
Spanish\Stuff 3 I get an error.  Fixing the capitalization is not an
option for me.  My initial idea was to make a list of all the different
ways "project" has been capitalized in my repo and try each one.  The
code looks like this:

import pysvn

def getstuff(stuffiwant, languageiwantitin):
	projects = ("project %s/", "Project %s/", "pRojects %s/")
	c = pysvn.Client()
	for p in projects:
		exportme = p % languageiwantitin
		exportme = "http://localhost/" + exportme + stuffiwant
		try:
			c.export(exportme, "C:\\temp\\")
			break
		except pysvn.ClientError:
			print "Not the right capitalization."
	# do the rest of the stuff I need to do.

This works, but to me it seems like there has to be a better way of
doing it. Any feedback or suggestions would be appreciated. 

Thanks,
Matt


From usenot at geekmail.INVALID  Mon Mar  1 12:22:55 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Mon, 1 Mar 2010 18:22:55 +0100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
Message-ID: <20100301182255.3de59bc6@geekmail.INVALID>

On Tue, 02 Mar 2010 03:18:30 +1100 Lie Ryan <lie.1296 at gmail.com> wrote:

> On 03/02/10 00:09, Andreas Waldenburger wrote:
> > On Mon, 1 Mar 2010 05:01:49 -0800 (PST) alex23 <wuwei23 at gmail.com>
> > wrote:
> > 
> >> Andreas Waldenburger <use... at geekmail.INVALID> wrote:
> >>> But as I said: a) I am (we are) not in a position to impose this
> >>> (We don't work with the code, we just run the software).
> >>
> >> I personally believe that the end users have _every_ right to
> >> impose quality requirements on  code used within their
> >> business...although I may not bring this up in front of them at
> >> meetings :)
> > 
> > Huh? That's like demanding a certain type of truck or vehicle
> > maintenance plan from a trucking company. Sure, you *could* do it,
> > but that effectively only limits your options. I think there should
> > be a clear separation of concerns here.
> 
> If my truck contains food items that spoils quickly, I would want to
> make sure that the trucking company takes good care of their
> refrigeration system and that the truck have as little chance as
> possible for breakdown due to poor maintenance.

My point was that it should not be any of your concern *how* they do
it, only *that* they do it.

Back in the software world: Those guys write code that works. It does
what it's supposed to do. Why should we care where they put their
comments?

-- 
INVALID? DE!



From pmaupin at gmail.com  Mon Mar  1 12:34:47 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 09:34:47 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
Message-ID: <66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>

On Mar 1, 11:13?am, Robert Kern <robert.k... at gmail.com> wrote:
> Ignore it. That comment really doesn't apply to this case. That's for things
> that only make sense in the language or standard library, like context managers.
> For libraries like this, Steven's summary is correct. It needs to have a useful
> life as a third party package for a few years before you should propose it for
> inclusion into the standard library. By all means, distribute a design document
> for comment before you implement things; it's a reasonable practice. But don't
> bother with a PEP yet.

So, I went and re-read PEP 1, and in the fine print it directs me to
PEP 2.  Mea culpa -- I though I understood the PEP.

Nonetheless, the fact that I created what I call a "PEP draft" seems
to have had more read into it than I meant.  I will bear this in mind
when I start future projects.  I have a couple of projects, and
contribute to another, which in no way should wind up in the standard
library.  But I find the lack of a good, up-to-date, configuration
reader in the library to be an issue, which is why I had the temerity
to try to start a discussion on what a good standard configuration
file reader should be.

Yes, I would like to create something compelling enough to go into the
standard library. No, I don't expect it to wind up there for a very
long time, if ever.  BUT, at the same time, following the PEP format
is very valuable for my project.  It forces me to think more deeply
about the problem I am solving and it forces me to write down some
documentation.  Really, it's no more burdensome than any other similar
useful template.

Or, to put it another way, it is my goal (which I may or may not be
smart enough to reach) to write a module that anybody would want to
use; that is good enough to put into the standard library.  Whether
this happens or not, one useful tool to help the module down that path
(and produce a better module for me and other users even if it never
becomes part of the standard library) is to think about what it takes
to get into the standard library.  Part of this involves writing the
PEP.  Writing a PEP is a good exercise; the format itself helps me to
focus on important issues.

So I was writing the contents of the PEP anyway, just for me.  The
real question, then, is when to release the PEP (vs. the code).  I've
already got some coding done, but it is not yet good enough to share,
and if there is anybody else out there grappling with the same issues
at this time, I would prefer not to go into production with it until
they have had a chance to look over the design and offer insights and
criticisms.

Best regards,
Pat


From robert.kern at gmail.com  Mon Mar  1 12:42:16 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Mon, 01 Mar 2010 11:42:16 -0600
Subject: Docstrings considered too complicated
In-Reply-To: <20100301182255.3de59bc6@geekmail.INVALID>
References: <20100224212303.242222c6@geekmail.INVALID>	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>	<20100227191040.6c77f2d8@geekmail.INVALID>	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>	<20100301140943.4edca16b@geekmail.INVALID>	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
Message-ID: <hmgua9$a5i$1@dough.gmane.org>

On 2010-03-01 11:22 , Andreas Waldenburger wrote:

> Back in the software world: Those guys write code that works. It does
> what it's supposed to do. Why should we care where they put their
> comments?

Software usually needs to be maintained and extended over the course of its 
lifetime. The original team that wrote it may not be available in the future.

Furthermore, docstrings are not comments. They become part of the function 
object and can be introspected at runtime. This is a very important tool when 
working with code at the interactive prompt and for the collection of API 
documentation. Comments are less useful than docstrings; the OP's complaint was 
that his programmers were putting the function documentation in other places 
than docstrings, rendering them less useful than they could have been.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From jeanmichel at sequans.com  Mon Mar  1 12:42:17 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 01 Mar 2010 18:42:17 +0100
Subject: Docstrings considered too complicated
In-Reply-To: <20100301182255.3de59bc6@geekmail.INVALID>
References: <20100224212303.242222c6@geekmail.INVALID>	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>	<20100227191040.6c77f2d8@geekmail.INVALID>	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>	<20100301140943.4edca16b@geekmail.INVALID>	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
Message-ID: <4B8BFC79.10103@sequans.com>

Andreas Waldenburger wrote:
> On Tue, 02 Mar 2010 03:18:30 +1100 Lie Ryan <lie.1296 at gmail.com> wrote:
>
>   
>> On 03/02/10 00:09, Andreas Waldenburger wrote:
>>     
>>> On Mon, 1 Mar 2010 05:01:49 -0800 (PST) alex23 <wuwei23 at gmail.com>
>>> wrote:
>>>
>>>       
>>>> Andreas Waldenburger <use... at geekmail.INVALID> wrote:
>>>>         
>>>>> But as I said: a) I am (we are) not in a position to impose this
>>>>> (We don't work with the code, we just run the software).
>>>>>           
>>>> I personally believe that the end users have _every_ right to
>>>> impose quality requirements on  code used within their
>>>> business...although I may not bring this up in front of them at
>>>> meetings :)
>>>>         
>>> Huh? That's like demanding a certain type of truck or vehicle
>>> maintenance plan from a trucking company. Sure, you *could* do it,
>>> but that effectively only limits your options. I think there should
>>> be a clear separation of concerns here.
>>>       
>> If my truck contains food items that spoils quickly, I would want to
>> make sure that the trucking company takes good care of their
>> refrigeration system and that the truck have as little chance as
>> possible for breakdown due to poor maintenance.
>>     
>
> My point was that it should not be any of your concern *how* they do
> it, only *that* they do it.
>
> Back in the software world: Those guys write code that works. It does
> what it's supposed to do. Why should we care where they put their
> comments?
>
>   
If you've bought the code and want to maintain it, you'd better make 
sure it's possible.
By the way, the ISO 9001 standard ask for your out sourced processing to 
be compliant with your QA objectives, so if you care about your code, 
then you should care for the code you buy.

JM


From R.Brodie at rl.ac.uk  Mon Mar  1 12:47:59 2010
From: R.Brodie at rl.ac.uk (Richard Brodie)
Date: Mon, 1 Mar 2010 17:47:59 -0000
Subject: Is there a better way to do this?
References: <mailman.65.1267464765.23598.python-list@python.org>
Message-ID: <hmgukf$bdn$1@south.jnrs.ja.net>


"Matt Mitchell" <mmitchell at transparent.com> wrote in message 
news:mailman.65.1267464765.23598.python-list at python.org...
> My initial idea was to make a list of all the different
> ways "project" has been capitalized in my repo and try each one.  The
> code looks like this:

I would use pysvn.Client.list to get a list of files at whatever directory level
you require. Then you can do a case insensitive compare or whatever else.




From wolftracks at invalid.com  Mon Mar  1 12:49:58 2010
From: wolftracks at invalid.com (W. eWatson)
Date: Mon, 01 Mar 2010 09:49:58 -0800
Subject: Verifying My Troublesome Linkage Claim between Python and Win7
In-Reply-To: <hm21g1$p22$1@panix5.panix.com>
References: <hm0jn4$tnf$1@news.eternal-september.org>
	<hm21g1$p22$1@panix5.panix.com>
Message-ID: <hmguo8$itl$1@news.eternal-september.org>

On 2/23/2010 6:04 PM, Aahz wrote:
> In article<hm0jn4$tnf$1 at news.eternal-september.org>,
> W. eWatson<wolftracks at invalid.com>  wrote:
>>
>> My claim is that if one creates a program in a folder that reads a file
>> in the folder it and then copies it to another folder, it will read  the
>> data file in the first folder, and not a changed file in the new folder.
>> I'd appreciate it if some w7 users could try this, and let me know what
>> they find.
>>
>> My experience is that if one checks the properties of the copied file,
>> it will point to the original py file and execute it and not the copy.
>
> I've no time to verify your specific claim and have no readily available
> proof for mine, but I've seen similar issues on Win7.  AFAIK, this has
> nothing to do with Python.
I've been away for several days and have no idea if anyone above figured 
this out. Likely not,since your post is at the end.

Interesting about 'similar'. I'm pretty much done exploring every nook 
and cranny on this problem. It can be worked around. I will say that if 
I look at the properties of the copied file, it shows a shortcut tab 
that leads back to the original file. I have no recollection of making a 
shortcut, and always use Copy and Paste. Further, if I do create 
shortcut in W7, it adds "-shortcut to the file suffix. I do not ever 
recall seeing that anywhere. I just tried it in XP, and it puts it in 
front of the name.


From joaopcf at gmail.com  Mon Mar  1 12:54:20 2010
From: joaopcf at gmail.com (=?ISO-8859-1?Q?Jo=E3o?=)
Date: Mon, 1 Mar 2010 09:54:20 -0800 (PST)
Subject: [newbie] - python list into a sql query
Message-ID: <3b20cfbf-c31f-44c4-8fbc-f95ab71690ff@x22g2000yqx.googlegroups.com>

Hi.

Can someone guide me into getting this to work? It's just really
querying a DB of an Autodiscovery tool to have a bunch of updated dns
files.
(Thought I'm still building the first script steps) I was able to
successfully query the DB against a single groupid, but am failing in
passing a list of integers into the sql query.

I'm failing miserably in,

sql = '''SELECT ip, host, dns FROM zabbix_tst_db.hosts WHERE hostid IN
(
select hostid from hosts_groups WHERE groupid IN (' +
','.join(map(str, %s)) + ')''' % grp_range


with
    _mysql_exceptions.ProgrammingError: (1064, "You have an error in
your SQL syntax; check the manual that corresponds to your MySQL
server version for the right syntax to use near '' at line 1")



I'll gladly accept any other code change suggestion


    #!/usr/bin/env python

    import MySQLdb
    import sys, os
    import code

    builder_path = '/opt/scripts/dns_builder'
    grp_range = range(10,15)

    try:
            db = MySQLdb.connect(host="localhost",
                               user="tst",passwd="tst",db="tst_db" )
    except MySQLdb.Error, e:
        print "Error %d: %s" % (e.args[0], e.args[1])

    cursor = db.cursor()

    sql = '''SELECT ip, host, dns FROM zabbix_tst_db.hosts WHERE
hostid IN (
    select hostid from hosts_groups WHERE groupid IN (' +
','.join(map(str, %s)) + ')''' % grp_range

    cursor.execute(sql)

    f = open('%s/dns_unknown_list.txt', 'w+') % builder_path
    data = cursor.fetchall()

    for row in data:
    ip = row[0]
    host = row[1]
    dns = row[2]
    if host == dns:
      #tmn
      if ip[0][:10] in ('140.254.30','10.13.74.')
       group1_file = open('%s/group1.zone', 'w') % builder_path
       print >>group1_file, '''$ORIGIN group1

       '''
       print >>group1_file, '%s IN A    %s' % (dns, ip)
      elif ip[0][:3] in ('8.128.46.','6.128.101')
       group2_file = open('%s/group2.zone', 'w') % builder_path
       print >>group2_file, '''$ORIGIN group2

       '''
       print >>group2_file, '%s IN A    %s' % (dns, ip)
      else:
       print >>f, 'unknown     IN A    %s' % ip

    db.close()
    input_file.close()
    f.close()


From no.email at nospam.invalid  Mon Mar  1 13:03:33 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Mon, 01 Mar 2010 10:03:33 -0800
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
Message-ID: <7xljebyl56.fsf@ruckus.brouhaha.com>

Patrick Maupin <pmaupin at gmail.com> writes:
> it is my goal (which I may or may not be smart enough to reach) to
> write a module that anybody would want to use;

But you are working on a solution in search of a problem.  The really
smart thing to do would be pick something more useful to work on.  We
don't need another configuration language.  I can't even say "yet
another" because there's already a "yet another" called yaml.


From robert.kern at gmail.com  Mon Mar  1 13:05:06 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Mon, 01 Mar 2010 12:05:06 -0600
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
Message-ID: <hmgvl3$g91$1@dough.gmane.org>

On 2010-03-01 11:34 , Patrick Maupin wrote:
> On Mar 1, 11:13 am, Robert Kern<robert.k... at gmail.com>  wrote:
>> Ignore it. That comment really doesn't apply to this case. That's for things
>> that only make sense in the language or standard library, like context managers.
>> For libraries like this, Steven's summary is correct. It needs to have a useful
>> life as a third party package for a few years before you should propose it for
>> inclusion into the standard library. By all means, distribute a design document
>> for comment before you implement things; it's a reasonable practice. But don't
>> bother with a PEP yet.
>
> So, I went and re-read PEP 1, and in the fine print it directs me to
> PEP 2.  Mea culpa -- I though I understood the PEP.
>
> Nonetheless, the fact that I created what I call a "PEP draft" seems
> to have had more read into it than I meant.  I will bear this in mind
> when I start future projects.  I have a couple of projects, and
> contribute to another, which in no way should wind up in the standard
> library.  But I find the lack of a good, up-to-date, configuration
> reader in the library to be an issue, which is why I had the temerity
> to try to start a discussion on what a good standard configuration
> file reader should be.
>
> Yes, I would like to create something compelling enough to go into the
> standard library. No, I don't expect it to wind up there for a very
> long time, if ever.  BUT, at the same time, following the PEP format
> is very valuable for my project.  It forces me to think more deeply
> about the problem I am solving and it forces me to write down some
> documentation.  Really, it's no more burdensome than any other similar
> useful template.

Certainly. The PEP format is a useful one. I've used it myself for some numpy 
design documents. But can you see why people might get confused about your 
intentions when you call it a draft PEP and post it to python-dev? If you stop 
calling it a PEP and stop talking about putting it in the standard library, 
people will stop being distracted by those issues.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From maygeo at netplus.ch  Mon Mar  1 13:07:17 2010
From: maygeo at netplus.ch (Raphael Mayoraz)
Date: Mon, 01 Mar 2010 10:07:17 -0800
Subject: Variable definition
In-Reply-To: <4B887224.2080805@optimum.net>
References: <4B885A0B.9040705@netplus.ch> <4B887224.2080805@optimum.net>
Message-ID: <4B8C0255.3090509@netplus.ch>

John Posner wrote:
> On 2/26/2010 6:32 PM, Raphael Mayoraz wrote:
>> Hello,
>>
>> I'd like to define variables with some specific name that has a common
>> prefix.
>> Something like this:
>>
>> varDic = {'red': 'a', 'green': 'b', 'blue': 'c'}
>> for key, value in varDic.iteritems():
>> 'myPrefix' + key = value
>>
>
> No trick, just swap a new key-value pair for each existing pair:
>
>   for key, value in varDic.iteritems():
>       varDic[myPrefix + key] = value
>       del varDict[key]
>
> Just make sure that *myPrefix* isn't an empty string!
>
> -John
Thanks for your answer.
However, your solution changes the key name in the dictionary.
That's not what I want I need to do. What I want is to define a new
variable which name is define as a string: 'myPrefx' + key. In the example
I give, I would get 3 variables:
myPrefixred = a
myPrefixgreen = b
myPrefixblue = c

Raphael


From fetchinson at googlemail.com  Mon Mar  1 13:40:00 2010
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Mon, 1 Mar 2010 19:40:00 +0100
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <7xljebyl56.fsf@ruckus.brouhaha.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
Message-ID: <fbe2e2101003011040lc2b965ek4f650801d00cae54@mail.gmail.com>

>> it is my goal (which I may or may not be smart enough to reach) to
>> write a module that anybody would want to use;
>
> But you are working on a solution in search of a problem.  The really
> smart thing to do would be pick something more useful to work on.  We
> don't need another configuration language.  I can't even say "yet
> another" because there's already a "yet another" called yaml.

And in case you are new here let me assure you that Paul is saying
this with his full intention of being helpful to you. I also would
think that working on such a project might be fun and educational for
you but completely useless if you have users other than yourself in
mind. Again, I'm trying to be helpful here, so you can focus on a
project that is both fun/educational for you and also potentially
useful for others. This RSON business is not one of them.

Cheers,
Daniel



-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From python at mrabarnett.plus.com  Mon Mar  1 13:44:49 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Mon, 01 Mar 2010 18:44:49 +0000
Subject: [newbie] - python list into a sql query
In-Reply-To: <3b20cfbf-c31f-44c4-8fbc-f95ab71690ff@x22g2000yqx.googlegroups.com>
References: <3b20cfbf-c31f-44c4-8fbc-f95ab71690ff@x22g2000yqx.googlegroups.com>
Message-ID: <4B8C0B21.8010404@mrabarnett.plus.com>

Jo?o wrote:
> Hi.
> 
> Can someone guide me into getting this to work? It's just really
> querying a DB of an Autodiscovery tool to have a bunch of updated dns
> files.
> (Thought I'm still building the first script steps) I was able to
> successfully query the DB against a single groupid, but am failing in
> passing a list of integers into the sql query.
> 
> I'm failing miserably in,
> 
> sql = '''SELECT ip, host, dns FROM zabbix_tst_db.hosts WHERE hostid IN
> (
> select hostid from hosts_groups WHERE groupid IN (' +
> ','.join(map(str, %s)) + ')''' % grp_range
> 
> 
> with
>     _mysql_exceptions.ProgrammingError: (1064, "You have an error in
> your SQL syntax; check the manual that corresponds to your MySQL
> server version for the right syntax to use near '' at line 1")
> 
[snip]
The triple-quoted string starts at:

     '''SELECT ...

and ends at:

     ...)''' % grp_range

which means that the part where you do the .join is _inside_ the string.


From pmaupin at gmail.com  Mon Mar  1 13:45:07 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 10:45:07 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
Message-ID: <466b86b0-a115-4871-b17c-b16d7d74fce0@y17g2000yqd.googlegroups.com>

On Mar 1, 12:03?pm, Paul Rubin <no.em... at nospam.invalid> wrote:

> But you are working on a solution in search of a problem. ?The really
> smart thing to do would be pick something more useful to work on. ?We
> don't need another configuration language. ?I can't even say "yet
> another" because there's already a "yet another" called yaml.

The only "in search of" here is that, instead of working on a point
solution for my particular problem, I am "in search of" a solution
that is a bit more elegant and general, and that might help solve
other people's problems too.  If you are not one of those that has
this sort of problem at this point in time, then feel free to kill-
file this thread.

Thanks,
Pat


From leo.shklovskii at gmail.com  Mon Mar  1 13:47:42 2010
From: leo.shklovskii at gmail.com (Leo)
Date: Mon, 1 Mar 2010 10:47:42 -0800 (PST)
Subject: python shell crashing on paste
References: <1ede46e4-8ca1-4fe0-ad3f-7e781bbe1182@b36g2000pri.googlegroups.com>
	<4b84ca31$0$15832$ba4acef3@reader.news.orange.fr>
Message-ID: <227e3061-db36-4188-a174-74019814af63@t31g2000prh.googlegroups.com>

Thanks for responding Michel. It looks like its an issue with
pyreadline - http://ipython.scipy.org/moin/PyReadline/Intro - causing
the crash. I'm working with the author of it on trying to get the
issue figured out.

It's not related to UAC.

--
--Leo

On Feb 23, 10:41?pm, "Michel Claveau -
MVP"<enleverLesX_XX... at XmclavXeauX.com.invalid> wrote:
> Hi!
>
> Where (directory) are you, when the problem come?
> Have you try with UAC disabled?
>
> @+
> -- ?
> MCI



From rami.chowdhury at gmail.com  Mon Mar  1 14:04:25 2010
From: rami.chowdhury at gmail.com (Rami Chowdhury)
Date: Mon, 1 Mar 2010 11:04:25 -0800
Subject: [newbie] - python list into a sql query
In-Reply-To: <3b20cfbf-c31f-44c4-8fbc-f95ab71690ff@x22g2000yqx.googlegroups.com>
References: <3b20cfbf-c31f-44c4-8fbc-f95ab71690ff@x22g2000yqx.googlegroups.com>
Message-ID: <201003011104.25211.rami.chowdhury@gmail.com>

On Monday 01 March 2010 09:54:20 Jo?o wrote:
> Hi.
> 
> Can someone guide me into getting this to work? It's just really
> querying a DB of an Autodiscovery tool to have a bunch of updated dns
> files.

I wouldn't be building SQL queries by hand if I could avoid it -- is this just 
a few one-off scripts or a project that could usefully benefit from a database 
abstraction layer (like SQLAlchemy: http://www.sqlalchemy.org)?

> 
> sql = '''SELECT ip, host, dns FROM zabbix_tst_db.hosts WHERE hostid IN
> (
> select hostid from hosts_groups WHERE groupid IN (' +
> ','.join(map(str, %s)) + ')''' % grp_range
> 

I'm not sure what you expect this to evaluate to?

#>>> grp_range = [1, 2, 3] # dummy data
#>>> sql = '''SELECT ip, host, dns FROM zabbix_tst_db.hosts WHERE hostid IN
... (
... SELECT hostid FROM hosts_groups WHERE groupid IN (' + 
... ','.join(map(str, %s)) + ')''' % grp_range
#>>> print sql
SELECT ip, host, dns FROM zabbix_tst_db.hosts WHERE hostid IN
(
SELECT hostid FROM hosts_groups WHERE groupid IN (' + 
','.join(map(str, [1, 2, 3])) + ')

Since the triple-quoted string only ends at the corresponding triple quote, 
you're including some Python code into the string instead of executing it. If 
you really want to splice the elements of grp_range into the query, you should 
do something like:

#>>> sql = 'SELECT ip, host, dns FROM zabbix_tst_db.hosts WHERE hostid IN 
(SELECT hostid FROM hosts_groups WHERE groupid IN (%s))' % ",".join(str(x) for 
x in grp_range)
#>>> sql
'SELECT ip, host, dns FROM zabbix_tst_db.hosts WHERE hostid IN (SELECT hostid 
FROM hosts_groups WHERE groupid IN (1,2,3))'

Although, really, if you can, I'd parameterise the query (http://mysql-
python.sourceforge.net/MySQLdb-1.2.2/public/MySQLdb.cursors.BaseCursor-
class.html#execute) at the very least...

> 
> with
>     _mysql_exceptions.ProgrammingError: (1064, "You have an error in
> your SQL syntax; check the manual that corresponds to your MySQL
> server version for the right syntax to use near '' at line 1")
> 
> 
> 
> I'll gladly accept any other code change suggestion
> 
> 
>     #!/usr/bin/env python
> 
>     import MySQLdb
>     import sys, os
>     import code
> 
>     builder_path = '/opt/scripts/dns_builder'
>     grp_range = range(10,15)
> 
>     try:
>             db = MySQLdb.connect(host="localhost",
>                                user="tst",passwd="tst",db="tst_db" )
>     except MySQLdb.Error, e:
>         print "Error %d: %s" % (e.args[0], e.args[1])
> 
>     cursor = db.cursor()
> 
>     sql = '''SELECT ip, host, dns FROM zabbix_tst_db.hosts WHERE
> hostid IN (
>     select hostid from hosts_groups WHERE groupid IN (' +
> ','.join(map(str, %s)) + ')''' % grp_range
> 
>     cursor.execute(sql)
> 
>     f = open('%s/dns_unknown_list.txt', 'w+') % builder_path
>     data = cursor.fetchall()
> 
>     for row in data:
>     ip = row[0]
>     host = row[1]
>     dns = row[2]
>     if host == dns:
>       #tmn
>       if ip[0][:10] in ('140.254.30','10.13.74.')
>        group1_file = open('%s/group1.zone', 'w') % builder_path
>        print >>group1_file, '''$ORIGIN group1
> 
>        '''
>        print >>group1_file, '%s IN A    %s' % (dns, ip)
>       elif ip[0][:3] in ('8.128.46.','6.128.101')
>        group2_file = open('%s/group2.zone', 'w') % builder_path
>        print >>group2_file, '''$ORIGIN group2
> 
>        '''
>        print >>group2_file, '%s IN A    %s' % (dns, ip)
>       else:
>        print >>f, 'unknown     IN A    %s' % ip
> 
>     db.close()
>     input_file.close()
>     f.close()


----
Rami Chowdhury
"As an online discussion grows longer, the probability of a comparison 
involving Nazis or Hitler approaches one." -- Godwin's Law
408-597-7068 (US) / 07875-841-046 (UK) / 01819-245544 (BD)


From pmaupin at gmail.com  Mon Mar  1 14:18:20 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 11:18:20 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<mailman.68.1267466740.23598.python-list@python.org>
Message-ID: <062d989e-27db-46b3-913f-0573bb70543f@y17g2000yqd.googlegroups.com>

>
> Certainly. The PEP format is a useful one. I've used it myself for some numpy
> design documents. But can you see why people might get confused about your
> intentions when you call it a draft PEP and post it to python-dev? If you stop
> calling it a PEP and stop talking about putting it in the standard library,
> people will stop being distracted by those issues.

As I mentioned, I didn't see the fine print in PEP 1 about PEP 2 being
the document for library modules.  As I mentioned, mea culpa.  It is
painfully obvious that some don't like the way I have gone about
describing the project.  They obviously view me announcing this as
premature, or presumptuous, or something, and they have some sort of
visceral reaction to that.

However, I do not believe that any people (other than me) were really
confused in the process.  I made my intentions clear, and some people
reacted badly to that because I didn't follow the process (for which I
apologize again).  But calling it a draft PEP is a distraction
(because of the visceral reaction), but is not really what I would
call confusing.  My intention actually is to try to build something
that is worthy of the standard library, and to eventually try to get
it accepted, because I perceive a hole there, with a lot of point
solutions being done to solve a common problem, and I believe the
pushback is coming from people who fully understood that intention
from my posting.

I will try to say "hey -- here's a hole in the library and a proposal
for how to fix it" more diplomatically and in the correct forum in the
future, but it would be disingenuous for me to disown my goal of
getting a better configparser into the standard library.

Regards,
Pat


From pmaupin at gmail.com  Mon Mar  1 14:30:28 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 11:30:28 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org>
Message-ID: <3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>

On Mar 1, 12:40?pm, Daniel Fetchinson <fetchin... at googlemail.com>
wrote:
> > But you are working on a solution in search of a problem. ?The really
> > smart thing to do would be pick something more useful to work on. ?We
> > don't need another configuration language. ?I can't even say "yet
> > another" because there's already a "yet another" called yaml.
>
> And in case you are new here let me assure you that Paul is saying
> this with his full intention of being helpful to you. I also would
> think that working on such a project might be fun and educational for
> you but completely useless if you have users other than yourself in
> mind. Again, I'm trying to be helpful here, so you can focus on a
> project that is both fun/educational for you and also potentially
> useful for others. This RSON business is not one of them.

OK, but I am a bit unclear on what you and/or Paul are claiming.  It
could be one of a number of things.  For example:

- There is a preexisting file format suitable for my needs, so I
should not invent another one.

- If I invent a file format suitable for my needs, it couldn't
possibly be general enough for anybody else.

- Even if it was general enough for somebody else, there would only be
two of them.

I've been known to waste time (or be accused of wasting time) on
various endeavors, but I like to know exactly *why* it is perceived to
be a waste.

Regards,
Pat


From jjposner at optimum.net  Mon Mar  1 14:34:53 2010
From: jjposner at optimum.net (John Posner)
Date: Mon, 01 Mar 2010 14:34:53 -0500
Subject: Variable definition
In-Reply-To: <4B8C0255.3090509@netplus.ch>
References: <4B885A0B.9040705@netplus.ch> <4B887224.2080805@optimum.net>
	<4B8C0255.3090509@netplus.ch>
Message-ID: <4B8C16DD.40506@optimum.net>

On 3/1/2010 1:07 PM, Raphael Mayoraz wrote:
> John Posner wrote:
>> On 2/26/2010 6:32 PM, Raphael Mayoraz wrote:
>>> Hello,
>>>
>>> I'd like to define variables with some specific name that has a common
>>> prefix.
>>> Something like this:
>>>
>>> varDic = {'red': 'a', 'green': 'b', 'blue': 'c'}
>>> for key, value in varDic.iteritems():
>>> 'myPrefix' + key = value
>>>
>>
>> No trick, just swap a new key-value pair for each existing pair:
>>
>> for key, value in varDic.iteritems():
>> varDic[myPrefix + key] = value
>> del varDict[key]
>>
>> Just make sure that *myPrefix* isn't an empty string!
>>
>> -John
> Thanks for your answer.
> However, your solution changes the key name in the dictionary.
> That's not what I want I need to do. What I want is to define a new
> variable which name is define as a string: 'myPrefx' + key. In the example
> I give, I would get 3 variables:
> myPrefixred = a
> myPrefixgreen = b
> myPrefixblue = c

Yes, I misinterpreted your request. I believe there's a consensus around 
here that you shouldn't even try to accomplish your goal. Instead of 
creating *myPrefixred* as a (module-)global name or a (function-)local 
name, you should just use the dictionary as-is: *varDict['red']*. Or 
maybe make the names into attributes of a class, as Alex Goretoy 
suggested. [1]

Can you present a convincing argument as to why you really, really need 
to use the name *myPrefixred* ?

-John

[1] http://mail.python.org/pipermail/python-list/2010-February/1237736.html





From helps4indian at gmail.com  Mon Mar  1 14:37:03 2010
From: helps4indian at gmail.com (coolboy8)
Date: Mon, 1 Mar 2010 11:37:03 -0800 (PST)
Subject: Best auto insurance company // Best auto insurance company /// Best 
	auto insurance company  ///
Message-ID: <795a705c-5564-4cf8-8b83-71d2aeae4a53@s36g2000prf.googlegroups.com>

VISIT http://alturl.com/8xs8


From no.email at nospam.invalid  Mon Mar  1 14:37:39 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Mon, 01 Mar 2010 11:37:39 -0800
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org>
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
Message-ID: <7xhbozrfy4.fsf@ruckus.brouhaha.com>

Patrick Maupin <pmaupin at gmail.com> writes:
> - There is a preexisting file format suitable for my needs, so I
> should not invent another one.

There are in fact quite a few--json, yaml, .ini, xml, Python literals
(http://code.activestate.com/recipes/364469-safe-eval/), s-expressions,
actual Python code that the application can import, and so forth.

The problem isn't that you're trying to invent a useless file format per
se, but rather that in trying to get other people to learn it and use
it, you're also trying to appropriate a chunk of the user community's
scarce and precious brain cells without good justification.  Newbie
designers are often lured into that and they're unfortunately (i.e. to
the community's detrimtent) often more successful than they really
should be.

Your one complaint about yaml is that it's slow to parse.  Why do you
care about the parsing speed of a config file?  If the existing
implementation is too slow, why not write a faster one instead of
designing yayaml?  Even yaml is excessive in my view.  "Yet another" was
an ok plan when Steve Johnson started the trope by writing Yacc 30 years
ago.  These days, don't do yet another without very convincing reasons
for rejecting what is already there.


From tjreedy at udel.edu  Mon Mar  1 14:41:27 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 01 Mar 2010 14:41:27 -0500
Subject: AOP decorator?
In-Reply-To: <9437135d-e2f7-4317-a5bd-46346fa5b5fb@q21g2000yqm.googlegroups.com>
References: <9437135d-e2f7-4317-a5bd-46346fa5b5fb@q21g2000yqm.googlegroups.com>
Message-ID: <hmh595$6do$1@dough.gmane.org>

On 3/1/2010 11:22 AM, gentlestone wrote:
> Hi,
>
> suppose my source code looks like:
> --------------------------------
>    import aspect_xy
>    class Basic(object, aspect_xy.Basic):
>      pass # basic attributes and methods ...

As a sidenote, this violates my understanding of aspect-oriented 
programming, which is to add aspects that go across several derived 
classes. But...

> --------------------------------
> and the source code of aspect_xy.py is:
> --------------------------------
>    class Basic(object):
>      pass  # aspect extra attributes and methods ...
> --------------------------------
> how can I write this with decorators? I want something like:
> -------------------------------
>    import aspect_xy
>    @aspect_xy # extra attributes and methods ...
>    class Basic(object):
>      pass # basic attributes and methods ...
> ----------------------------------------------------------
> I want to write class decorator function, which:
> 1. Takes the basic class as parameter
> 2. Find the same class name in aspect_xy.py
> 3. Inherit the found aspect class
> Is it possible?

You would have to look at the difference between Basic with and without 
the explicit base class and patch the latter to look like the former. At 
minimum, you would have to fix .__bases__ and .__mro__, but I do not 
know if those are writable. To me, it seems easier to be explicit.

tjr



From joncle at googlemail.com  Mon Mar  1 14:49:39 2010
From: joncle at googlemail.com (Jon Clements)
Date: Mon, 1 Mar 2010 11:49:39 -0800 (PST)
Subject: AOP decorator?
References: <9437135d-e2f7-4317-a5bd-46346fa5b5fb@q21g2000yqm.googlegroups.com>
Message-ID: <0d3daa47-cb27-4134-a6b5-be3824f5cf0b@f8g2000yqn.googlegroups.com>

On Mar 1, 4:22?pm, gentlestone <tibor.b... at hotmail.com> wrote:
> Hi,
>
> suppose my source code looks like:
> --------------------------------
> ? import aspect_xy
> ? class Basic(object, aspect_xy.Basic):
> ? ? pass # basic attributes and methods ...
> --------------------------------
> and the source code of aspect_xy.py is:
> --------------------------------
> ? class Basic(object):
> ? ? pass ?# aspect extra attributes and methods ...
> --------------------------------
> how can I write this with decorators? I want something like:
> -------------------------------
> ? import aspect_xy
> ? @aspect_xy # extra attributes and methods ...
> ? class Basic(object):
> ? ? pass # basic attributes and methods ...
> ----------------------------------------------------------
> I want to write class decorator function, which:
> 1. Takes the basic class as parameter
> 2. Find the same class name in aspect_xy.py
> 3. Inherit the found aspect class
> Is it possible?

Untested and written quickly, so all possible disclaimers apply ;)

class BaseObject(object):
    pass

def aspect_xy_dec(base):
    def wrapper(cls):
	return type(cls.__name__, (base, getattr(aspect_xy, cls.__name__)),
{})
    return wrapper

@aspect_xy(BaseObject)
class SomeObject:
    pass


Cheers,

Jon.




From pmaupin at gmail.com  Mon Mar  1 14:59:13 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 11:59:13 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org> 
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com> 
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
Message-ID: <9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>

On Mar 1, 1:37?pm, Paul Rubin <no.em... at nospam.invalid> wrote:
> There are in fact quite a few--json, yaml, .ini, xml, Python literals
> (http://code.activestate.com/recipes/364469-safe-eval/), s-expressions,
> actual Python code that the application can import, and so forth.

Yes, I know about those.

> The problem isn't that you're trying to invent a useless file format per
> se, but rather that in trying to get other people to learn it and use
> it, you're also trying to appropriate a chunk of the user community's
> scarce and precious brain cells without good justification. ?Newbie
> designers are often lured into that and they're unfortunately (i.e. to
> the community's detrimtent) often more successful than they really
> should be.

Can't disagree with the statement about newbie designers.  On the flip
side, sometimes things wind up being defacto standards, simply because
nobody could be bothered to write a better one, and they have lots of
little niggling warts that also collectively take up a lot of time and
attention.  There is obviously a good balance somewhere.

> Your one complaint about yaml is that it's slow to parse. ?Why do you
> care about the parsing speed of a config file? ?If the existing
> implementation is too slow, why not write a faster one instead of
> designing yayaml? ?Even yaml is excessive in my view. ?"Yet another" was
> an ok plan when Steve Johnson started the trope by writing Yacc 30 years
> ago. ?These days, don't do yet another without very convincing reasons
> for rejecting what is already there.

One of my complaints.  If you had read the document you would have
seen others.  I actually have several complaints about YAML, but I
tried to write a cogent summary.

Regards,
Pat


From bdesth.quelquechose at free.quelquepart.fr  Mon Mar  1 14:59:55 2010
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Mon, 01 Mar 2010 20:59:55 +0100
Subject: Method / Functions - What are the differences?
In-Reply-To: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
Message-ID: <4b8c2a34$0$10470$426a74cc@news.free.fr>

Michael Rudolf a ?crit :
> Out of curiosity I tried this and it actually worked as expected:
> 
>>>> class T(object):
>     x=[]
>     foo=x.append
>     def f(self):
>         return self.x
> 
>     
>>>> t=T()
>>>> t.f()
> []
>>>> T.foo(1)
>>>> t.f()
> [1]
>>>>
> 
> At first I thought "hehe, always fun to play around with python. Might
> be useful sometimes" - but then It really confused me what I did. I
> mean: f is what we call a method, right? 

Wrong. It's a function. T.f is an unbound method (in python 2.x at
least) and t.f is a bound method.

> But was is foo?

A bound method. Bound to x, of course.

> It is not a
> method and not a classmethod as it accepts no self and no cls.

Yes it does. Else how would t.foo(4) (or T.foo(4)) append 4 to x ?

> Perhaps this all does not matter, 

It does.

> but now I am really confused about the
> terminology. So: what makes a method a method?

The right question is: what makes a function a method !-)

> And of what type?

Answer here:

http://groups.google.com/group/comp.lang.python/tree/browse_frm/thread/bd71264b6022765c/3a77541bf9d6617d#doc_89d608d0854dada0

I really have to put this in the wiki :-/


From no.email at nospam.invalid  Mon Mar  1 15:08:58 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Mon, 01 Mar 2010 12:08:58 -0800
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org>
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
Message-ID: <7x635fdcth.fsf@ruckus.brouhaha.com>

Patrick Maupin <pmaupin at gmail.com> writes:
> One of my complaints.  If you had read the document you would have
> seen others.  I actually have several complaints about YAML, but I
> tried to write a cogent summary.

Yaml sucks, but seems to have gotten some traction regardless.
Therefore the Python principle of "there should be one and only one
obvious way to do it" says: don't try to replace the existing thing if
your new thing is only slightly better.  Just deal with the existing
thing's imperfections or make improvements to it.  If you can make a
really powerful case that your new thing is 1000x better than the old
thing, that's different, but I don't think we're seeing that here.

Also, XML is used for pretty much everything in the Java world.  It
sucks too, but it is highly standardized, it observably gets the job
done, there are tons of structure editors for it, etc.  Frankly
I'd rather have stayed with it than deal with Yaml.

There are too many of these damn formats.  We should ban all but one of
them (I don't much care which one).  And making even more of them is not
the answer.


From usenot at geekmail.INVALID  Mon Mar  1 15:24:13 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Mon, 1 Mar 2010 21:24:13 +0100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.67.1267465365.23598.python-list@python.org>
Message-ID: <20100301212413.5694580e@geekmail.INVALID>

On Mon, 01 Mar 2010 11:42:16 -0600 Robert Kern <robert.kern at gmail.com>
wrote:

> On 2010-03-01 11:22 , Andreas Waldenburger wrote:
> 
> > Back in the software world: Those guys write code that works. It
> > does what it's supposed to do. Why should we care where they put
> > their comments?
> 
> Software usually needs to be maintained and extended over the course
> of its lifetime. The original team that wrote it may not be available
> in the future.
> 
> Furthermore, docstrings are not comments. They become part of the
> function object and can be introspected at runtime. This is a very
> important tool when working with code at the interactive prompt and
> for the collection of API documentation. Comments are less useful
> than docstrings; the OP's complaint was that his programmers were
> putting the function documentation in other places than docstrings,
> rendering them less useful than they could have been.
> 

No, the OP complained about those guys being idiots. I should know,
because I posted it.

/W

-- 
INVALID? DE!



From usenot at geekmail.INVALID  Mon Mar  1 15:29:54 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Mon, 1 Mar 2010 21:29:54 +0100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
Message-ID: <20100301212954.7aa0b99d@geekmail.INVALID>

On Mon, 01 Mar 2010 18:42:17 +0100 Jean-Michel Pichavant
<jeanmichel at sequans.com> wrote:

> Andreas Waldenburger wrote:
> [snip]
> > Back in the software world: Those guys write code that works. It
> > does what it's supposed to do. Why should we care where they put
> > their comments?
> >
> >   
> If you've bought the code and want to maintain it, you'd better make 
> sure it's possible.
> 
Fair enough, but we don't want to maintain it.


> By the way, the ISO 9001 standard ask for your out sourced processing
> to be compliant with your QA objectives, so if you care about your
> code, then you should care for the code you buy.
> 
We did not buy code. If it were written in C or such, we would never
get to see it.

It's not our concern.

/W

-- 
INVALID? DE!



From pmaupin at gmail.com  Mon Mar  1 15:35:46 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 12:35:46 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org> 
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com> 
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
Message-ID: <2804c8c0-ffe5-4dde-b076-3e0948c32021@g11g2000yqe.googlegroups.com>

On Mar 1, 2:08?pm, Paul Rubin <no.em... at nospam.invalid> wrote:

> Yaml sucks, but seems to have gotten some traction regardless.

Yes, that's actually one of the reasons I want to do this.  I've heard
that some of the YAML people want that in the standard library, and
IMHO that would be a huge mistake.

> Therefore the Python principle of "there should be one and only one
> obvious way to do it" says: don't try to replace the existing thing if
> your new thing is only slightly better.

But for my use-case, YAML is irretrievably broken.  Sure, it looks
reasonably nice, but it increases regression runtime unacceptably.
Also, despite their current protestations that Yaml AIN'T markup
language, the syntax still belies its markup roots.  I'm looking for a
configuration language, not a markup language.

>?Just deal with the existing thing's imperfections or make improvements to it.

Well, I've looked at the YAML parser and I can assure you that I will
not be contributing to that project.

> If you can make a really powerful case that your new thing is 1000x better than the old thing, that's different, but I don't think we're seeing that here.

Well, there's no way I'm hitting three orders of magnitude, but I
don't think the bar is really that high.  We will see.

> Also, XML is used for pretty much everything in the Java world. ?It
> sucks too, but it is highly standardized, it observably gets the job
> done, there are tons of structure editors for it, etc. ?Frankly
> I'd rather have stayed with it than deal with Yaml.

XML can certainly be made readable by humans.  It's hard to make it
writeable by (average) humans just using a regular text editor, and
even though there are tons of structure editors, requiring non-
technical people to find one of those and start using it is a non-
starter in many cases.  But I can't strongly disagree with the opinion
that YAML doesn't offer all that much over it.

> There are too many of these damn formats. ?We should ban all but one of
> them (I don't much care which one). ?And making even more of them is not
> the answer.

Well, I think that XML and YAML both overreach by trying to be all
things to all applications.  So I'm aiming a lot lower than that.  I
just want to make really good configuration files that are easy to
modify in a text editor.

None of the existing formats are suitable.  I may be the only one who
feels that way.  OTOH, if we never invented new things, then I
wouldn't be enjoying restructured text, and I'd be missing out on a
lot there...

Regards,
Pat


From no.email at nospam.invalid  Mon Mar  1 15:42:20 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Mon, 01 Mar 2010 12:42:20 -0800
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org>
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
	<2804c8c0-ffe5-4dde-b076-3e0948c32021@g11g2000yqe.googlegroups.com>
Message-ID: <7xwrxv4vv7.fsf@ruckus.brouhaha.com>

Patrick Maupin <pmaupin at gmail.com> writes:
> But for my use-case, YAML is irretrievably broken.  Sure, it looks
> reasonably nice, but it increases regression runtime unacceptably.

How big are the files that you want to parse with it?  Sheesh.

> Well, I've looked at the YAML parser and I can assure you that I will
> not be contributing to that project.

So write a new one that parses the same syntax, but cleaner and faster.

> XML can certainly be made readable by humans.  It's hard to make it
> writeable by (average) humans just using a regular text editor,

I do it all the time; it's a bit dreary but not difficult.  And there is
absolutely no way to get anything done in this field anymore without
dealing with XML from time to time.  So given that we all have some
experience using it, it's sensible to stick with it.

> None of the existing formats are suitable.  I may be the only one who
> feels that way.  OTOH, if we never invented new things, then I
> wouldn't be enjoying restructured text, and I'd be missing out on a
> lot there...

ReST is another abomination that should never have gotten off the
ground.  It is one of the reasons I react so negatively to your
config format proposal.  It just sounds like more of the same.


From urbangabo at gmail.com  Mon Mar  1 15:53:57 2010
From: urbangabo at gmail.com (Gabor Urban)
Date: Mon, 1 Mar 2010 21:53:57 +0100
Subject: Class attributes / methods..... full Python script
Message-ID: <f7ac28aa1003011253s1c11acf2j243aa0277e57082e@mail.gmail.com>

Hi guys,

thanks for the ideas. Here you are the code. Not transcoded from Java
for I do not know Java enough..

I am scanning an XML file, and have a large ammount of logging.

Any ideas are wellcome as before....

Thnx

Code:>

#---------------------------------------------
## Generate CSV from OEP History XML
#---------------------------------------------

import sys
import os
from xml.dom.minidom import parse, parseString
import xml.dom
import logging

versionStr = '0.01'

class Item:
    def __init__(self, pId, pChange, pComment):
        self.ID = pId
        self.Delta = pChange
        self.Comment = pComment

    def PrintItem(self):
        str = '%s,%s,%s'%(self.ID,self.Delta,self.comment)
        return str

class Package:
    def __init__(self, pSerial, pDate, pOwner, pSchema):
        self.serial = pSerial
        self.date = pDate
        self.owner = pOwner
        self.schema = pSchema
        self.items = []

    def insertItem(self, pItem):
        self.items.append(pItem)

    def printPackage(self):
        lines = []
        str = '%s,%s,%s,%s'%(self.serial,self.date,self.owner,self.schema)
        number = self.items.length
        for idx in xrange(number):
            line = ''
            istr = self.items[idx].PrintItem()
            line = str + ',' + istr
            lines.append(line)
        return lines

def getItem(tracer, pkgItem, itemName):
    retval = -1
    name = ""
    found = 0
    str = ""
    tracer.info('Function getItem entry, name = %s',itemName)
    nItem = pkgItem.getElementsByTagName(itemName).item(0)
    for node in pkgItem.childNodes:
        if node.nodeType != xml.dom.Node.TEXT_NODE:
            tracer.debug('Scanning node name = %s',node.nodeName)
            if node.nodeName == itemName:
                tracer.debug('Pkg %s found',itemName)
            else:
                tracer.warning('Pkg %s is not found',itemName)
                continue
            for entity in node.childNodes:
                if entity.nodeType == xml.dom.Node.TEXT_NODE:
                    retval = entity.nodeValue
                    tracer.debug("Node value found %s",retval)
                    found = 1
                    break
        if found == 1:
            break
    tracer.debug('Function getItem returns %s',retval)
    return retval

logger = logging.getLogger('XmlHistory')
handler = logging.FileHandler("Xmlhistory.trc",'a')
## handler = logging.StreamHandler(sys.stderr)
logger.addHandler(handler)
formatter = logging.Formatter("%(name)s %(asctime)s %(filename)s
%(lineno)d %(levelname)s %(message)s")
handler.setFormatter(formatter)
logger.setLevel(2)

fileName = "history.xml"
output = 'history.csv'
logger.info('Xml history generator version %s',versionStr)
logger.info('Starting history generation on file:%s',fileName)

packages = []
data = []

## Start XML processing

dataSource = parse(fileName)
print dataSource.documentElement.tagName
listCsomag = dataSource.getElementsByTagName("csomag")
size = listCsomag.length
logger.debug('Number of packages = %d',size)
for idx in xrange(size):
    attrib = ""
    package = None
    serial = 0
    date = ""
    owner = ""
    schema = ""
    flag = False
    logger.info('Parsing package id=%d',idx)
    attrib = getItem(logger, listCsomag.item(idx),'sorszam')
    if attrib <> "NUM" and attrib <> -1:
        serial = int(attrib)
        flag = True
        logger.debug('Package serial set to %d',serial)
    else:
        logger.debug("Template package found.")
        break
    attrib = ""
    attrib = getItem(logger,listCsomag.item(idx),"datum")
    if attrib <> -1:
        date = attrib
        flag = flag and True
        logger.debug('Package date set to %s',date)
    attrib = ""
    attrib = getItem(logger,listCsomag.item(idx),"ki")
    if attrib <> -1:
        owner = attrib
        flag = flag and True
        logger.debug('Package owner set to %s',owner)
    attrib = ""
    attrib = getItem(logger,listCsomag.item(idx),"sema")
    if attrib <> -1:
        schema = attrib
        flag = flag and True
        logger.debug('Package schema set to %s',schema)

    if flag <> True:
        logger.error('Package id=%d is inconsistent',idx)
        break
    else:
        logger.info('Package id=%d is ok',idx)

    package = Package(serial,date,owner,schema)

    listItem = listCsomag.item(idx).getElementsByTagName("item")
    itemSize = listItem.length
    logger.debug('Number of items = %d',itemSize)
    for num in xrange(itemSize):
        flag = False
        value = -1
        listId = 0
        change = ""
        comment = ""
        item = None
        logger.info('Parsing item id = %d',num)
        value = getItem(logger,listItem.item(num),"item_id")
        if value <> -1:
            listId = int(value)
            flag = True
            logger.debug('List id set to %d',listId)
        value = ""
        value = getItem(logger,listItem.item(num),"valtozas")
        if value <> -1:
            change = value
            flag = flag and True
            logger.debug('List change desc. set to "%s"',change)
        value = ""
        value = getItem(logger,listItem.item(num),"komment")
        if value <> -1:
            comment = value
            flag = flag and True
            logger.debug('List comment desc. set to "%s"',comment)

        if flag <> True:
            logger.error('Item id = %d inconsistent',num)
            break
        else:
            logger.info('Item id = %d is ok',num)

        item = Item(listId,change,comment)
        package.insertItem(item)

    packages.append(Package)

logger.info('Processing Xml file %s is done',fileName)
logger.info('Generating file %s is started',output)

size = len(packages)
package = None
for index in xrange(size):
    logger.info('PrettyPrinting package id=%d',index)
    oplines = []
    oplines = packages[index].printPackage()
    for i in xrange(oplines.length):
        data.append(oplines[i])

print data

-- 
Linux: Choice of a GNU Generation


From gh at ghaering.de  Mon Mar  1 15:59:53 2010
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Mon, 01 Mar 2010 21:59:53 +0100
Subject: Building Python with Scons
Message-ID: <hmh9s9$nm8$1@dough.gmane.org>

I'm setting up a third-party library project (similar to the one in 
Google Chromium) where I use SCons as build tool.

Now I need to integrate Python, too. Has anybody written a Scons script 
for Python 2.x or 3.x, yet?

-- Gerhard



From philip at semanchuk.com  Mon Mar  1 16:02:48 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Mon, 1 Mar 2010 16:02:48 -0500
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <7x635fdcth.fsf@ruckus.brouhaha.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org>
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
Message-ID: <7E76CFE6-DBEA-491C-B636-338D378672C4@semanchuk.com>


On Mar 1, 2010, at 3:08 PM, Paul Rubin wrote:

> Patrick Maupin <pmaupin at gmail.com> writes:
>> One of my complaints.  If you had read the document you would have
>> seen others.  I actually have several complaints about YAML, but I
>> tried to write a cogent summary.
>
> Yaml sucks, but seems to have gotten some traction regardless.
> Therefore the Python principle of "there should be one and only one
> obvious way to do it" says: don't try to replace the existing thing if
> your new thing is only slightly better.  Just deal with the existing
> thing's imperfections or make improvements to it.  If you can make a
> really powerful case that your new thing is 1000x better than the old
> thing, that's different, but I don't think we're seeing that here.
>
> Also, XML is used for pretty much everything in the Java world.  It
> sucks too, but it is highly standardized, it observably gets the job
> done, there are tons of structure editors for it, etc.  Frankly
> I'd rather have stayed with it than deal with Yaml.
>
> There are too many of these damn formats.  We should ban all but one  
> of
> them (I don't much care which one).  And making even more of them is  
> not
> the answer.


I dunno, times change, needs change. We must invent new tools, be  
those computer languages or data formats. Otherwise we'd still be  
programming in COBOL and writing fixed-length records to 12 inch  
floppies.*

If Mr. Maupin was a giant corporation trying to shove a proprietary  
format down our collective throats, I might object to RSON. But he's  
not. He appears willing for it live or die on its merits, so I say  
good luck to him. I don't want or need it, but someone else might.

Cheers
Philip


* You had floppies? Bleddy luxury! We wrote our data on wood pulp we'd  
chewed ourselves and dried into paper, using drops of our own blood to  
represent 1s and 0s.



From breamoreboy at yahoo.co.uk  Mon Mar  1 16:09:39 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Mon, 01 Mar 2010 21:09:39 +0000
Subject: Docstrings considered too complicated
In-Reply-To: <20100301212954.7aa0b99d@geekmail.INVALID>
References: <20100224212303.242222c6@geekmail.INVALID>	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>	<20100227191040.6c77f2d8@geekmail.INVALID>	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>	<20100301140943.4edca16b@geekmail.INVALID>	<4b8be8f7$1@dnews.tpgi.com.au>	<20100301182255.3de59bc6@geekmail.INVALID>	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
Message-ID: <hmhadv$q4i$1@dough.gmane.org>

Andreas Waldenburger wrote:
> On Mon, 01 Mar 2010 18:42:17 +0100 Jean-Michel Pichavant
> <jeanmichel at sequans.com> wrote:
> 
>> Andreas Waldenburger wrote:
>> [snip]
>>> Back in the software world: Those guys write code that works. It
>>> does what it's supposed to do. Why should we care where they put
>>> their comments?
>>>
>>>   
>> If you've bought the code and want to maintain it, you'd better make 
>> sure it's possible.
>>
> Fair enough, but we don't want to maintain it.
> 
> 
>> By the way, the ISO 9001 standard ask for your out sourced processing
>> to be compliant with your QA objectives, so if you care about your
>> code, then you should care for the code you buy.
>>
> We did not buy code. If it were written in C or such, we would never
> get to see it.
> 
> It's not our concern.
> 
> /W
> 

 From your original post.

<quote>
a company that works with my company writes a lot of of their code in
Python (lucky jerks). I've seen their code and it basically looks like
this:
</quote>

So what is the relationship between your company and this other company?
When it gets down to pounds, shillings and pence (gosh, I'm old!:) it 
sure as hell could make a tremendous difference in the long term, given 
that usually maintainance costs are astronomical when compared to 
initial development costs.

Regards.

Mark Lawrence.



From pmaupin at gmail.com  Mon Mar  1 16:11:59 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 13:11:59 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org> 
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com> 
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
	<2804c8c0-ffe5-4dde-b076-3e0948c32021@g11g2000yqe.googlegroups.com>
	<7xwrxv4vv7.fsf@ruckus.brouhaha.com>
Message-ID: <0417d443-2013-4f62-9158-b684e3be779c@u9g2000yqb.googlegroups.com>

On Mar 1, 2:42?pm, Paul Rubin <no.em... at nospam.invalid> wrote:
> Patrick Maupin <pmau... at gmail.com> writes:
> > But for my use-case, YAML is irretrievably broken. ?Sure, it looks
> > reasonably nice, but it increases regression runtime unacceptably.
>
> How big are the files that you want to parse with it? ?Sheesh.

Tiny, but over and over.  The rst2pdf testsuite can generate
approximately 160 PDFs, totalling around 2.5 MB, in around 22 seconds
on one of my machines.  But if I replace the JSON parser with a YAML
parser, that goes up to 55 seconds.  Wait, maybe it's because JSON is
optimized in C!  Nope, using JSON but disabling the C scanner only
takes it to 22.3 seconds...

>
> > Well, I've looked at the YAML parser and I can assure you that I will
> > not be contributing to that project.
>
> So write a new one that parses the same syntax, but cleaner and faster.

But there are already several parsers for YAML, and none of them
agree!  The syntax definition is a mess.  The thing's been in
development for 10 years now, and there is no one true way to do it.
Seriously, YAML overreaches for what I want.

> > XML can certainly be made readable by humans. ?It's hard to make it
> > writeable by (average) humans just using a regular text editor,
>
> I do it all the time; it's a bit dreary but not difficult. ?And there is
> absolutely no way to get anything done in this field anymore without
> dealing with XML from time to time. ?So given that we all have some
> experience using it, it's sensible to stick with it.

But people "in this field" are not really my target audience.  Well, I
mean people in this field are the target audience for the library, but
not for the writing of the actual text files.

> ReST is another abomination that should never have gotten off the
> ground. ?It is one of the reasons I react so negatively to your
> config format proposal. ?It just sounds like more of the same.

Well, that clarifies a lot.  I guess we'll just have to agree to
disagree :-)

Regards,
Pat


From alfps at start.no  Mon Mar  1 16:16:59 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Mon, 01 Mar 2010 22:16:59 +0100
Subject: How to crash CPython 3.1.1 in Windows XP
Message-ID: <hmhasc$epk$1@news.eternal-september.org>

How to crash CPython 3.1.1 in Windows XP:

   python -c "import os; os.spawnl( os.P_WAIT, 'blah' )"

I reported this as a bug, <url: http://bugs.python.org/issue8036>

Workaround: it seems that spawnl is happy with an absolute path as second arg, 
followed by a third arg which should be the name of the program (repeated).


Cheers,

- Alf


From __peter__ at web.de  Mon Mar  1 17:12:33 2010
From: __peter__ at web.de (Peter Otten)
Date: Mon, 01 Mar 2010 23:12:33 +0100
Subject: Class attributes / methods..... full Python script
References: <mailman.75.1267476839.23598.python-list@python.org>
Message-ID: <hmhe3m$l7j$03$1@news.t-online.com>

Gabor Urban wrote:

> thanks for the ideas. Here you are the code. Not transcoded from Java
> for I do not know Java enough..
> 
> I am scanning an XML file, and have a large ammount of logging.
> 
> Any ideas are wellcome as before....
> 
> Thnx
> 
> Code:>

>     packages.append(Package)

Replace Package (the class) with package (an instance).

> for i in xrange(oplines.length):
>     data.append(oplines[i])

Python lists don't have a length attribute. You can determine their length 
with len(oplines). To iterate over the items of a list you need not know the 
list's length:

for line in oplines:
    data.append(line)

which can be simplified to

data.extend(oplines)

Peter

PS: Rrread the tutorial


From emile at fenx.com  Mon Mar  1 17:12:56 2010
From: emile at fenx.com (Emile van Sebille)
Date: Mon, 01 Mar 2010 14:12:56 -0800
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <7E76CFE6-DBEA-491C-B636-338D378672C4@semanchuk.com>
References: <mailman.34.1267409372.23598.python-list@python.org>	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<mailman.64.1267463648.23598.python-list@python.org>	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>	<7xljebyl56.fsf@ruckus.brouhaha.com>	<mailman.70.1267468806.23598.python-list@python.org>	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>	<7xhbozrfy4.fsf@ruckus.brouhaha.com>	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>	<7x635fdcth.fsf@ruckus.brouhaha.com>
	<7E76CFE6-DBEA-491C-B636-338D378672C4@semanchuk.com>
Message-ID: <hmhe1d$728$1@dough.gmane.org>

On 3/1/2010 1:02 PM Philip Semanchuk said...
> * You had floppies? Bleddy luxury! We wrote our data on wood pulp we'd
> chewed ourselves and dried into paper, using drops of our own blood to
> represent 1s and 0s.

You had left-over blood?!!

Emile :)



From python at mrabarnett.plus.com  Mon Mar  1 17:31:02 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Mon, 01 Mar 2010 22:31:02 +0000
Subject: Class attributes / methods..... full Python script
In-Reply-To: <f7ac28aa1003011253s1c11acf2j243aa0277e57082e@mail.gmail.com>
References: <f7ac28aa1003011253s1c11acf2j243aa0277e57082e@mail.gmail.com>
Message-ID: <4B8C4026.3010907@mrabarnett.plus.com>

Gabor Urban wrote:
> Hi guys,
> 
> thanks for the ideas. Here you are the code. Not transcoded from Java
> for I do not know Java enough..
> 
> I am scanning an XML file, and have a large ammount of logging.
> 
> Any ideas are wellcome as before....
> 
> Thnx
> 
> Code:>
> 
> #---------------------------------------------
> ## Generate CSV from OEP History XML
> #---------------------------------------------
> 
> import sys
> import os
> from xml.dom.minidom import parse, parseString
> import xml.dom
> import logging
> 
> versionStr = '0.01'
> 
> class Item:
>     def __init__(self, pId, pChange, pComment):
>         self.ID = pId
>         self.Delta = pChange
>         self.Comment = pComment
> 
>     def PrintItem(self):
>         str = '%s,%s,%s'%(self.ID,self.Delta,self.comment)
>         return str
> 
> class Package:
>     def __init__(self, pSerial, pDate, pOwner, pSchema):
>         self.serial = pSerial
>         self.date = pDate
>         self.owner = pOwner
>         self.schema = pSchema
>         self.items = []
> 
>     def insertItem(self, pItem):
>         self.items.append(pItem)
> 
>     def printPackage(self):
>         lines = []
>         str = '%s,%s,%s,%s'%(self.serial,self.date,self.owner,self.schema)
>         number = self.items.length

If this is meant to get the length of self.items, then it won't work. It
should be:

         number = len(self.items)

>         for idx in xrange(number):
>             line = ''

What's the purpose of this line? You're not using 'line' before you
assign to it again.

>             istr = self.items[idx].PrintItem()
>             line = str + ',' + istr
>             lines.append(line)
>         return lines
> 
> def getItem(tracer, pkgItem, itemName):
>     retval = -1
>     name = ""
>     found = 0
>     str = ""
>     tracer.info('Function getItem entry, name = %s',itemName)
>     nItem = pkgItem.getElementsByTagName(itemName).item(0)
>     for node in pkgItem.childNodes:
>         if node.nodeType != xml.dom.Node.TEXT_NODE:
>             tracer.debug('Scanning node name = %s',node.nodeName)
>             if node.nodeName == itemName:
>                 tracer.debug('Pkg %s found',itemName)
>             else:
>                 tracer.warning('Pkg %s is not found',itemName)
>                 continue
>             for entity in node.childNodes:
>                 if entity.nodeType == xml.dom.Node.TEXT_NODE:
>                     retval = entity.nodeValue
>                     tracer.debug("Node value found %s",retval)
>                     found = 1
>                     break
>         if found == 1:
>             break
>     tracer.debug('Function getItem returns %s',retval)
>     return retval
> 
> logger = logging.getLogger('XmlHistory')
> handler = logging.FileHandler("Xmlhistory.trc",'a')
> ## handler = logging.StreamHandler(sys.stderr)
> logger.addHandler(handler)
> formatter = logging.Formatter("%(name)s %(asctime)s %(filename)s
> %(lineno)d %(levelname)s %(message)s")
> handler.setFormatter(formatter)
> logger.setLevel(2)
> 
> fileName = "history.xml"
> output = 'history.csv'
> logger.info('Xml history generator version %s',versionStr)
> logger.info('Starting history generation on file:%s',fileName)
> 
> packages = []
> data = []
> 
> ## Start XML processing
> 
> dataSource = parse(fileName)
> print dataSource.documentElement.tagName
> listCsomag = dataSource.getElementsByTagName("csomag")
> size = listCsomag.length
> logger.debug('Number of packages = %d',size)
> for idx in xrange(size):
>     attrib = ""
>     package = None
>     serial = 0
>     date = ""
>     owner = ""
>     schema = ""
>     flag = False
>     logger.info('Parsing package id=%d',idx)
>     attrib = getItem(logger, listCsomag.item(idx),'sorszam')
>     if attrib <> "NUM" and attrib <> -1:
>         serial = int(attrib)
>         flag = True
>         logger.debug('Package serial set to %d',serial)
>     else:
>         logger.debug("Template package found.")
>         break
>     attrib = ""

What's the purpose of this line? You're not using 'attrib' before you
assign to it again. You're doing this repeatedly in the code.

>     attrib = getItem(logger,listCsomag.item(idx),"datum")
>     if attrib <> -1:
>         date = attrib
>         flag = flag and True

Whether 'flag' is False or True, this line won't change it. You're also
doing this repeatedly in the code.

>         logger.debug('Package date set to %s',date)
>     attrib = ""
>     attrib = getItem(logger,listCsomag.item(idx),"ki")
>     if attrib <> -1:
>         owner = attrib
>         flag = flag and True
>         logger.debug('Package owner set to %s',owner)
>     attrib = ""
>     attrib = getItem(logger,listCsomag.item(idx),"sema")
>     if attrib <> -1:
>         schema = attrib
>         flag = flag and True
>         logger.debug('Package schema set to %s',schema)
> 
>     if flag <> True:

Clearer as:

     if not flag:

or even clearer if you picked a better name than 'flag'.

>         logger.error('Package id=%d is inconsistent',idx)
>         break
>     else:
>         logger.info('Package id=%d is ok',idx)
> 
>     package = Package(serial,date,owner,schema)
> 
>     listItem = listCsomag.item(idx).getElementsByTagName("item")
>     itemSize = listItem.length
>     logger.debug('Number of items = %d',itemSize)
>     for num in xrange(itemSize):
>         flag = False
>         value = -1
>         listId = 0
>         change = ""
>         comment = ""
>         item = None
>         logger.info('Parsing item id = %d',num)
>         value = getItem(logger,listItem.item(num),"item_id")
>         if value <> -1:
>             listId = int(value)
>             flag = True
>             logger.debug('List id set to %d',listId)
>         value = ""
>         value = getItem(logger,listItem.item(num),"valtozas")
>         if value <> -1:
>             change = value
>             flag = flag and True
>             logger.debug('List change desc. set to "%s"',change)
>         value = ""
>         value = getItem(logger,listItem.item(num),"komment")
>         if value <> -1:
>             comment = value
>             flag = flag and True
>             logger.debug('List comment desc. set to "%s"',comment)
> 
>         if flag <> True:
>             logger.error('Item id = %d inconsistent',num)
>             break
>         else:
>             logger.info('Item id = %d is ok',num)
> 
>         item = Item(listId,change,comment)
>         package.insertItem(item)
> 
>     packages.append(Package)
> 
The instance is 'package', the class is 'Package'. You're using the
wrong one.

> logger.info('Processing Xml file %s is done',fileName)
> logger.info('Generating file %s is started',output)
> 
> size = len(packages)
> package = None
> for index in xrange(size):
>     logger.info('PrettyPrinting package id=%d',index)
>     oplines = []
>     oplines = packages[index].printPackage()
>     for i in xrange(oplines.length):

The length of a list, string, etc, is given by 'len', eg. len(oplines).

>         data.append(oplines[i])
> 
> print data
> 



From ben+python at benfinney.id.au  Mon Mar  1 17:48:47 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Tue, 02 Mar 2010 09:48:47 +1100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
Message-ID: <87eik3zmi8.fsf@benfinney.id.au>

Andreas Waldenburger <usenot at geekmail.INVALID> writes:

> On Mon, 01 Mar 2010 18:42:17 +0100 Jean-Michel Pichavant
> <jeanmichel at sequans.com> wrote:
>
> > Andreas Waldenburger wrote:
> > [snip]
> > > Back in the software world: Those guys write code that works. It
> > > does what it's supposed to do. Why should we care where they put
> > > their comments?
> > >   
> > If you've bought the code and want to maintain it, you'd better make
> > sure it's possible.
> > 
> Fair enough, but we don't want to maintain it.

Do you want it maintained beyond the span of your agreement with the
current developers? Do you want to have free choice in who will maintain
it over the period that you need it maintained?

I understood ?want to maintain it? in Jean-Michel's message to include
the possibility to get someone else to maintain it on your terms.

> It's not our concern.

Then I don't see what that problem is.

-- 
 \     ?To save the world requires faith and courage: faith in reason, |
  `\            and courage to proclaim what reason shows to be true.? |
_o__)                                                ?Bertrand Russell |
Ben Finney


From jon.sneyers at gmail.com  Mon Mar  1 17:55:44 2010
From: jon.sneyers at gmail.com (Jon Sneyers)
Date: 1 Mar 2010 14:55:44 -0800
Subject: Call for Participation: CHR Summer School
Message-ID: <8331b2f8-c9b7-4d23-923a-06e52cd75e19@z35g2000yqd.googlegroups.com>



- Call for Participation -


First International Summer School on CHR:
Programming and Reasoning with Rules and Constraints

August 30 - September 3 2010
Leuven, Belgium

Website:   http://www.cs.kuleuven.be/~dtai/CHR/summerschool

****************************************************************************
* EARLY REGISTRATION DISCOUNT: When registering (including payment) before *
*               March 31, the registration fee will be reduced by 20 euro! *
*
*
* Additional early registration incentive:                                 *
* The first 7 registrants get a FREE copy of the book                      *
*     "Constraint Handling Rules - Current Research Topics"                *
****************************************************************************


The aim of the summer school is to familiarize the participants with
state-of-the-art high-level declarative programming with rules and
constraints as well as providing insights into the analysis of programs
based on these concepts. The courses cover a wide range from theory to
practice.

The summer school will be based on the advanced high-level rule-based
formalism and programming language Constraint Handling Rules (CHR)
http://constraint-handling-rules.org/



Intended Audience:

The summer school provides courses at various levels. It is open to
anyone interested. It aims at Phd. students, but also post-docs,
interested researchers and master students as well as interested parties
from industry. Besides a working knowledge of English, there are no
prerequisites. A basic knowledge of logic and Prolog that is usually
covered in undergraduate classes could be helpful.


Lectures and Courses:

The programming language CHR will be introduced by several lecturers
on the first day of the summer school.

- Slim Abdennadher, GUC, Egypt
        Analysis of CHR Solvers
- Henning Christiansen, U. Roskilde, Denmark
        Abduction and language processing with CHR
- Thom Fruehwirth, University Ulm, Germany
        CHR - a common platform for rule-based approaches
- Jon Sneyers, K.U.Leuven, Belgium
        Computability and Complexity of CHR
- Peter Van Weert, K.U.Leuven, Belgium
        Implementation of CHR Systems

A final evaluation for each course is possible through a final exam or
project as determined by the instructor. The daily schedule admits
laboratory, recitation or working group activities to be organized in
addition to lectures.


Registration:

The registration fee for the School is 300 euro and includes teaching material
with book, as well as accomodation and coffee breaks. Meals are not included.
Attendance is limited to 20 students and will be allocated on a first-come-
first-served basis. Without accommodation the registration fee is reduced to
200 euro.


Location:

Leuven is a lively student town in Belgium with a very high density of
pubs offering hundreds of types of local beers.


Organization:

Thom Fruehwirth, University of Ulm, Germany
Jon Sneyers, K.U. Leuven, Belgium
Peter Van Weert, K.U. Leuven, Belgium


-- 

Looking for an H-912 (container).



From g.bogle at auckland.no.spam.ac.nz  Mon Mar  1 18:04:02 2010
From: g.bogle at auckland.no.spam.ac.nz (Gib Bogle)
Date: Tue, 02 Mar 2010 12:04:02 +1300
Subject: PyQt4.7 and PyQwt5.2.0
References: <hmemdg$oo7$1@speranza.aioe.org>
Message-ID: <hmhh53$jqi$1@speranza.aioe.org>

Gib Bogle wrote:
> I installed the latest PyQt (4.7-1), then PyQwt 5.2.0, which was built 
> with PyQt4.5.4.  This line
> 
> import PyQt4.Qwt5 as Qwt
> 
> fails to load the DLL.  Could this be the result of not using PyQt4 4.5.4?

I guess I can answer my own question.  As far as I can determine, PyQwt 5.2.0 
needs PyQt 4.5.4 to work.


From rhodri at wildebst.demon.co.uk  Mon Mar  1 18:06:27 2010
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Mon, 01 Mar 2010 23:06:27 -0000
Subject: Variable definition
References: <4B885A0B.9040705@netplus.ch> <4B887224.2080805@optimum.net>
	<mailman.69.1267466847.23598.python-list@python.org>
Message-ID: <op.u8wvs1kxa8ncjz@gnudebst>

On Mon, 01 Mar 2010 18:07:17 -0000, Raphael Mayoraz <maygeo at netplus.ch>  
wrote:

> Thanks for your answer.
> However, your solution changes the key name in the dictionary.
> That's not what I want I need to do. What I want is to define a new
> variable which name is define as a string: 'myPrefx' + key. In the  
> example
> I give, I would get 3 variables:
> myPrefixred = a
> myPrefixgreen = b
> myPrefixblue = c

I repeat my previous question: why?  What problem do you think this will  
solve that will not be more easily solved working with the language rather  
than against it?

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


From max at alcyone.com  Mon Mar  1 18:30:55 2010
From: max at alcyone.com (Erik Max Francis)
Date: Mon, 01 Mar 2010 15:30:55 -0800
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <mailman.70.1267468806.23598.python-list@python.org>
References: <mailman.34.1267409372.23598.python-list@python.org>	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<mailman.64.1267463648.23598.python-list@python.org>	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org>
Message-ID: <mb-dnbrp-4St0xHWnZ2dnUVZ_u5i4p2d@giganews.com>

Daniel Fetchinson wrote:
>>> it is my goal (which I may or may not be smart enough to reach) to
>>> write a module that anybody would want to use;
>> But you are working on a solution in search of a problem.  The really
>> smart thing to do would be pick something more useful to work on.  We
>> don't need another configuration language.  I can't even say "yet
>> another" because there's already a "yet another" called yaml.
> 
> And in case you are new here let me assure you that Paul is saying
> this with his full intention of being helpful to you. I also would
> think that working on such a project might be fun and educational for
> you but completely useless if you have users other than yourself in
> mind. Again, I'm trying to be helpful here, so you can focus on a
> project that is both fun/educational for you and also potentially
> useful for others. This RSON business is not one of them.

Agreed.  Even YAML's acronym indicates that it is already a bridge too 
far; we don't need more.

-- 
Erik Max Francis && max at alcyone.com && http://www.alcyone.com/max/
  San Jose, CA, USA && 37 18 N 121 57 W && AIM/Y!M/Skype erikmaxfrancis
   It's better to be quotable than to be honest.
    -- Tom Stoppard


From max at alcyone.com  Mon Mar  1 18:33:08 2010
From: max at alcyone.com (Erik Max Francis)
Date: Mon, 01 Mar 2010 15:33:08 -0800
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <466b86b0-a115-4871-b17c-b16d7d74fce0@y17g2000yqd.googlegroups.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<466b86b0-a115-4871-b17c-b16d7d74fce0@y17g2000yqd.googlegroups.com>
Message-ID: <mb-dnbXp-4Qp0xHWnZ2dnUVZ_u5i4p2d@giganews.com>

Patrick Maupin wrote:
> On Mar 1, 12:03 pm, Paul Rubin <no.em... at nospam.invalid> wrote:
> 
>> But you are working on a solution in search of a problem.  The really
>> smart thing to do would be pick something more useful to work on.  We
>> don't need another configuration language.  I can't even say "yet
>> another" because there's already a "yet another" called yaml.
> 
> The only "in search of" here is that, instead of working on a point
> solution for my particular problem, I am "in search of" a solution
> that is a bit more elegant and general, and that might help solve
> other people's problems too.  If you are not one of those that has
> this sort of problem at this point in time, then feel free to kill-
> file this thread.

Psst.  That you're allowed to present the idea that you think is good 
doesn't mean that other people aren't allowed to respond and point out 
that in their opinion it's not such a good idea.  You don't own this or 
any other thread.

-- 
Erik Max Francis && max at alcyone.com && http://www.alcyone.com/max/
  San Jose, CA, USA && 37 18 N 121 57 W && AIM/Y!M/Skype erikmaxfrancis
   It's better to be quotable than to be honest.
    -- Tom Stoppard


From max at alcyone.com  Mon Mar  1 18:57:42 2010
From: max at alcyone.com (Erik Max Francis)
Date: Mon, 01 Mar 2010 15:57:42 -0800
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
Message-ID: <scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>

Patrick Maupin wrote:
> On Feb 28, 9:18 pm, Steven D'Aprano > Wait a minute... if JSON is too
> hard to edit, and RSON is a *superset* of
>> JSON, that means by definition every JSON file is also a valid RSON file.
>> Since JSON is too hard to manually edit, so is RSON.
> 
> Well, Python is essentially a superset of JSON, with string escape
> handling being ever so slightly different, and using True instead of
> true, False instead of false, and None instead of null.  YMMV, but I
> find it possible, even probable, to write Python that is far easier to
> edit than JSON, and in fact, I have used Python for configuration
> files that are only to be edited by programmers or other technical
> types.

This not only seriously stretching the meaning of the term "superset" 
(as Python is most definitely not even remotely a superset of JSON), but 
still doesn't address the question.  Is RSON and _actual_ superset of 
JSON, or are you just misusing the term there, as well?  If it is, then 
your rationale for not using JSON makes no sense if you're making a new 
format that's merely a superset of it.  Obviously JSON can't be that 
unreadable if you're _extending_ it to make your own "more readable" 
format.  If JSON is unreadable, so must be RSON.

-- 
Erik Max Francis && max at alcyone.com && http://www.alcyone.com/max/
  San Jose, CA, USA && 37 18 N 121 57 W && AIM/Y!M/Skype erikmaxfrancis
   It's better to be quotable than to be honest.
    -- Tom Stoppard


From massimodipierro71 at gmail.com  Mon Mar  1 19:20:06 2010
From: massimodipierro71 at gmail.com (mdipierro)
Date: Mon, 1 Mar 2010 16:20:06 -0800 (PST)
Subject: taking python enterprise level?...
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com> 
	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>
Message-ID: <778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>

On Mar 1, 6:32?am, simn_stv <nany... at googlemail.com> wrote:
...
>
> > You have to follow some tricks:
>
> > 1) have the web server serve static pages directly and set the pragma
> > cache expire to one month
> > 2) cache all pages that do not have forms for at least few minutes
> > 3) avoid database joins
>
> but this would probably be to the detriment of my database design,
> which is a no-no as far as im concerned. The way the tables would be
> structured requires 'joins' when querying the db; or could you
> elaborate a little??

Joins are the bottle neck of most web app that relay on relational
databases. That is why non-relational databases such as Google App
Engine, CouchDB, MongoDB do not even support Joins. You have to try to
minimize joins as much as possible by using tricks such as de-
normalization and caching.

> > 4) use a server with at least 512KB Ram.
>
> hmmm...!, still thinking about what you mean by this statement also.

I meant 512MB. The point is you need a lot of ram because you want to
run multiple python instances, cache in ram as much as possible and
also allow the database to buffer in ram as much as possible. You will
see Ram usage tends to spike when you have lots of concurrent
requests.



From misceverything at gmail.com  Mon Mar  1 19:41:57 2010
From: misceverything at gmail.com (T)
Date: Mon, 1 Mar 2010 16:41:57 -0800 (PST)
Subject: Py2exe - Bad File Descriptor
References: <0c04902d-03e8-4b0e-8dd3-3bbdf7ea09b6@z11g2000yqz.googlegroups.com>
	<mailman.26.1267390207.23598.python-list@python.org>
	<c13e8eec-0cf0-4ec5-88af-87baaed039b3@g10g2000yqh.googlegroups.com>
	<mailman.37.1267412421.23598.python-list@python.org>
Message-ID: <b3562288-9191-4260-ac07-38eeabe93af7@o30g2000yqb.googlegroups.com>

On Feb 28, 10:00?pm, Dennis Lee Bieber <wlfr... at ix.netcom.com> wrote:
> On Sun, 28 Feb 2010 13:22:19 -0800 (PST), T <misceveryth... at gmail.com>
> declaimed the following in gmane.comp.python.general:
>
> > Sorry for the lack of code - yes, it does try to write to the
> > console. ?From what I'm finding, this error may be due to the fact
> > that there is no "console" to write to when I'm logged off. ?However,
> > I would like to be able to print to screen if I run the EXE in debug
> > mode (i.e. "myservice.exe debug"). ?Do you know of any way around
> > this? ?Also, I need to get the output generated from an external EXE -
> > will subprocess.Popen cause problems if I use stdout=PIPE? ?Thanks for
> > your help!
>
> ? ? ? ? True services typically don't have interactive (console) type I/O...
> What is more likely to work is to have an open socket waiting for
> connections, and the use of a separate user-space client that connects
> to the socket...
> --
> ? ? ? ? Wulfraed ? ? ? ? Dennis Lee Bieber ? ? ? ? ? ? ? KD6MOG
> ? ? ? ? wlfr... at ix.netcom.com ? ? ?HTTP://wlfraed.home.netcom.com/

So how would that work..would the program buffer all the "print"
output, then send it to the client when it connects?  Do you happen to
know of any available code that utilizes this method, or something
similar?  Thanks for your help.


From pmaupin at gmail.com  Mon Mar  1 19:45:07 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 16:45:07 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<466b86b0-a115-4871-b17c-b16d7d74fce0@y17g2000yqd.googlegroups.com>
	<mb-dnbXp-4Qp0xHWnZ2dnUVZ_u5i4p2d@giganews.com>
Message-ID: <2e244da6-7fdc-48a2-acd4-c8861c5d7c2f@q16g2000yqq.googlegroups.com>

On Mar 1, 5:33?pm, Erik Max Francis <m... at alcyone.com> wrote:
> Psst. ?That you're allowed to present the idea that you think is good
> doesn't mean that other people aren't allowed to respond and point out
> that in their opinion it's not such a good idea. ?You don't own this or
> any other thread.

Absolutely, but I still do (and will always) express a clear
preference for opinions that have at least a modicum of reasoning
behind them.

Regards,
Pat


From pmaupin at gmail.com  Mon Mar  1 19:56:46 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 16:56:46 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
Message-ID: <4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>

On Mar 1, 5:57?pm, Erik Max Francis <m... at alcyone.com> wrote:
> Patrick Maupin wrote:
> This not only seriously stretching the meaning of the term "superset"
> (as Python is most definitely not even remotely a superset of JSON), but

Well, you are entitled to that opinion, but seriously, if I take valid
JSON, replace unquoted true with True, unquoted false with False,
replace unquoted null with None, and take the quoted strings and
replace occurrences of \uXXXX with the appropriate unicode, then I do,
in fact, have valid Python.  But don't take my word for it -- try it
out!

But if you really want to be pedantic about it, JavaScript (rather
than Python) is, in fact a superset of JSON, and, despite the
disparagement JavaScript receives, in my opinion, it is possible to
write much better looking JavaScript than JSON for many tasks.

YAML, also, is a superset of JSON, and IMO, it is possible to write
much better looking YAML than JSON.

> still doesn't address the question. ?Is RSON and _actual_ superset of
> JSON, or are you just misusing the term there, as well?

Yes, the RSON definition, in fact, a superset of JSON, just like the
YAML definition.  But RSON is a much smaller grammar than YAML.

 ?If it is, then
> your rationale for not using JSON makes no sense if you're making a new
> format that's merely a superset of it. ?Obviously JSON can't be that
> unreadable if you're _extending_ it to make your own "more readable"
> format. ?If JSON is unreadable, so must be RSON.

Well, we'll have to agree to disagree here.  Bearing in mind that the
definition of "unreadable" depends on the target application and user,
obviously, it will be *possible* to write unreadable RSON, just as it
is *possible* to write unreadable JavaScript or Python or YAML, but it
will be *possible* to write better looking RSON than is possible to
achieve with JSON, just as it is *possible* to write better looking
JavaScript or YAML or Python than it is *possible* to achieve with
pure JSON.

Best regards,
Pat


From jjposner at optimum.net  Mon Mar  1 20:07:37 2010
From: jjposner at optimum.net (John Posner)
Date: Mon, 01 Mar 2010 20:07:37 -0500
Subject: Method / Functions - What are the differences?
In-Reply-To: <4b8c2a34$0$10470$426a74cc@news.free.fr>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
Message-ID: <hmhobt$6rl$1@dough.gmane.org>

On 3/1/2010 2:59 PM, Bruno Desthuilliers wrote:

> Answer here:
>
> http://groups.google.com/group/comp.lang.python/tree/browse_frm/thread/bd71264b6022765c/3a77541bf9d6617d#doc_89d608d0854dada0
>
> I really have to put this in the wiki :-/


Bruno, I performed a light copy-edit of your writeup and put in some 
reStructuredText (reST) markup. The result is at:

   http://cl1p.net/bruno_0301.rst/

The only sentence that I think needs work is:

   Having access to itself (of course), the
   instance (if there's one) and the class, it's easy for it
   to wrap all this into a **method** object.

Maybe this?

   With the instance object (if any) and class object available,
   it's easy to create a method object that wraps the function object.


Begging pardon for my presumptuousness,
John



From xi at gamma.dn.ua  Mon Mar  1 20:07:39 2010
From: xi at gamma.dn.ua (Kirill Simonov)
Date: Mon, 01 Mar 2010 20:07:39 -0500
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <mb-dnbrp-4St0xHWnZ2dnUVZ_u5i4p2d@giganews.com>
References: <mailman.34.1267409372.23598.python-list@python.org>	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<mailman.64.1267463648.23598.python-list@python.org>	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>	<7xljebyl56.fsf@ruckus.brouhaha.com>	<mailman.70.1267468806.23598.python-list@python.org>
	<mb-dnbrp-4St0xHWnZ2dnUVZ_u5i4p2d@giganews.com>
Message-ID: <4B8C64DB.3010105@gamma.dn.ua>

Erik Max Francis wrote:
> Daniel Fetchinson wrote:
>>>> it is my goal (which I may or may not be smart enough to reach) to
>>>> write a module that anybody would want to use;
>>> But you are working on a solution in search of a problem.  The really
>>> smart thing to do would be pick something more useful to work on.  We
>>> don't need another configuration language.  I can't even say "yet
>>> another" because there's already a "yet another" called yaml.
>>
>> And in case you are new here let me assure you that Paul is saying
>> this with his full intention of being helpful to you. I also would
>> think that working on such a project might be fun and educational for
>> you but completely useless if you have users other than yourself in
>> mind. Again, I'm trying to be helpful here, so you can focus on a
>> project that is both fun/educational for you and also potentially
>> useful for others. This RSON business is not one of them.
> 
> Agreed.  Even YAML's acronym indicates that it is already a bridge too 
> far; we don't need more.
> 

Note that YA in the acronym doesn't mean Yet Another, YAML = YAML Ain't 
Markup Language.


Thanks,
Kirill


From roy at panix.com  Mon Mar  1 20:20:05 2010
From: roy at panix.com (Roy Smith)
Date: Mon, 01 Mar 2010 20:20:05 -0500
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<eq4l57-okf2.ln1@ozzie.tundraware.com>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <7uu1ooFiipU1@mid.individual.net>
	<4B89D8BE.2040905@mrabarnett.plus.com> <4B8B9845.70604@sequans.com>
	<mailman.59.1267456634.23598.python-list@python.org>
Message-ID: <roy-DEF860.20200401032010@news.panix.com>

In article <mailman.59.1267456634.23598.python-list at python.org>,
 MRAB <python at mrabarnett.plus.com> wrote:

> Ah, yes, Star Trek (the original series).
> 
> If they transported down to a planet and there was a man in a red shirt
> who you'd never seen before, he'd be the one to die! :-)

Of course.  Everybody knows there's an endless supply of red shirts.


From eman_no1 at yahoo.com  Mon Mar  1 20:47:44 2010
From: eman_no1 at yahoo.com (Eman)
Date: Mon, 1 Mar 2010 17:47:44 -0800 (PST)
Subject: How to use python to register a service (an existing .exe file)
References: <4b79e28c$0$4610$426a74cc@news.free.fr>
Message-ID: <881a0df5-872f-4c19-a989-fe3ffe775655@k2g2000pro.googlegroups.com>

On Feb 15, 4:10?pm, News123 <news... at free.fr> wrote:
> Hi,
>
> Is there a python way to register new windows services.
>
> I am aware of the
> instsrv.exe program, which can be used to install services.
> I could use subprocess.Popen to call
>
> instsrv.exe "service_name" program.exe
>
> but wondered, whether there's already an existing function.
>
> Thans in advance and bye
>
> N


Try my favorite 3rd pary tools maker, Chilkatsoft.com.
http://www.chilkatsoft.com/refdoc/pythonCkServiceRef.html

Eman_No1


From xi at gamma.dn.ua  Mon Mar  1 21:02:34 2010
From: xi at gamma.dn.ua (Kirill Simonov)
Date: Mon, 01 Mar 2010 21:02:34 -0500
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <d09829f51002281809w2d2e556ct841f5adaaf78a723@mail.gmail.com>
References: <d09829f51002281809w2d2e556ct841f5adaaf78a723@mail.gmail.com>
Message-ID: <4B8C71BA.9060106@gamma.dn.ua>

Patrick Maupin wrote:
> All:
> 
> Finding .ini configuration files too limiting, JSON and XML to hard to
> manually edit, and YAML too complex to parse quickly, I have started
> work on a new configuration file parser.

I'd like to note that with the optional libyaml bindings, the PyYAML 
parser is pretty fast.

> I call the new format RSON (for "Readable Serial Object Notation"),
> and it is designed to be a superset of JSON.
> 
> I would love for it to be considered valuable enough to be a part of
> the standard library, but even if that does not come to pass, I would
> be very interested in feedback to help me polish the specification,
> and then possibly help for implementation and testing.
> 
> The documentation is in rst PEP form, at:
> 
> http://rson.googlecode.com/svn/trunk/doc/draftpep.txt

=== cut ===
Because YAML does allow for highly readable configuration files, it
is tempting to overlook its other flaws for the task.  But a fully
(or almost) compliant parser has to understand the whole YAML
specification, and this is apparently expensive.  Running the rst2pdf
testsuite, without sphinx or most of the other optional packages, in
"fast" mode (preloading all the modules, and then forking for every
test) generates 161 smallish PDF files, totaling around 2.5 MB.  On
one test system this process takes 22 seconds.  Disabling the _json C
scanner and reading the configuration files using the json pure Python
implementation adds about 0.3 seconds to the 22 seconds.  But using
pyyaml v. 3.09 instead of json adds 33 seconds to the 22 second process!
It might seem that this is an edge case, but it makes it unacceptable to
use YAML for this sort of testing, and taking 200 ms to read in 1000
lines of simple JSON will be unacceptable in many other application
domains as well.
=== cut ===

I'd question your testing methodology.  From your description, it looks 
like the _json speedup never was enabled.  Also PyYAML provides optional 
bindings to libyaml, which makes parsing and emitting yaml much faster. 
  In my tests, it parses a 10Mb file in 3 sec.

=== cut ===
RSON semantics are based on JSON.  Like JSON, an RSON document represents
either a single scalar object, or a DAG (Directed Acyclic Graph), which
may contain only a few simple data types.
=== cut ===

JSON doesn't represent a DAG, at least, not an arbitrary DAG since each 
node in the document has no more than one parent.  It would be more 
accurate to say that that it represents a tree-like structure.

=== cut ===
The YAML syntax for supporting back-references was considered and deemed
unsatisfactory. A human user who wants to put identical information in a
"ship to" and "bill to" address is much more likely to use cut and paste
than he is to understand and use backreferences, so the additional overhead
of supporting more complex document structures is unwarranted.

The concept of a "merge" in YAML, where two sub-trees of data can be
merged together (similar to a recursive Python dictionary update)
is quite useful, though, and will be copied.  This does not alter the
outcome that parsing a RSON file will result in a DAG, but does give
more flexibility in the syntax that can be used to achieve a particular
output DAG.
=== cut ===

This paragraph assumes the reader is familiar with intricate details of 
the YAML grammar and semantics.  I bet most of your audience are 
completely lost here.

=== cut ===
Enhanced example::

     key1/key2a
         key3a = Some random string
         key3b = 42
     key1/key2a
         key3c
             1
             2
             {}
                 key4a = anything
                 key4b = something else
             []
                 a
                 b
                 c
             3
             4
     key1/key2b = [1, 2, 3, 4]
     key5 = ""
        This is a multi-line string.  It is
           dedented to the farthest left
           column that is indented from
           the line containing "".
     key6 = [""]
        This is an array of strings, one per line.
        Each string is dedented appropriately.
=== cut ===

Frankly, this is an example that only a mother could love.  I'd suggest 
you to add some real-world examples, make sure they look nice and put 
them to the introductory part of the document.  Examples is how the 
format will be evaluated by the readers, and yours don't stand a chance.

Seriously, the only reason YAML enjoys its moderate popularity despite 
its overcomplicated grammar, chronic lack of manpower and deficient 
implementations is because it's so cute.



Disclaimer: I'm the author of PyYAML and libyaml.

Thanks,
Kirill


From axpbgj at terra.com  Mon Mar  1 21:12:02 2010
From: axpbgj at terra.com (floatron)
Date: 01 Mar 2010 23:12:02 -0300
Subject: ze     Basta de cloro en su piscina
Message-ID: <20100301231202.1A5E8DBF4FBCD983@terra.com>

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From pmaupin at gmail.com  Mon Mar  1 21:19:34 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 20:19:34 -0600
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <4B8C71BA.9060106@gamma.dn.ua>
References: <d09829f51002281809w2d2e556ct841f5adaaf78a723@mail.gmail.com>
	<4B8C71BA.9060106@gamma.dn.ua>
Message-ID: <d09829f51003011819p70287a31k9edde871066294ff@mail.gmail.com>

Kirill:

Thank you for your constructive criticism.  This is the gem that made
it worthwhile to post my document.  I think all of your points are
spot-on, and I will be fixing the documentation.

I can well believe that the C implementation of YAML is much faster
than the Python one, but I am aiming for something that will be
reasonably quick in pure Python.  I will double-check the JSON C test
results, but something I probably did not make clear is that the 22
seconds is not spent parsing -- that is for the entire test, which
involves reading restructured text and generating some 160 separate
PDF files.

Best regards,
Pat


On Mon, Mar 1, 2010 at 8:02 PM, Kirill Simonov <xi at gamma.dn.ua> wrote:
> Patrick Maupin wrote:
>>
>> All:
>>
>> Finding .ini configuration files too limiting, JSON and XML to hard to
>> manually edit, and YAML too complex to parse quickly, I have started
>> work on a new configuration file parser.
>
> I'd like to note that with the optional libyaml bindings, the PyYAML parser
> is pretty fast.
>
>> I call the new format RSON (for "Readable Serial Object Notation"),
>> and it is designed to be a superset of JSON.
>>
>> I would love for it to be considered valuable enough to be a part of
>> the standard library, but even if that does not come to pass, I would
>> be very interested in feedback to help me polish the specification,
>> and then possibly help for implementation and testing.
>>
>> The documentation is in rst PEP form, at:
>>
>> http://rson.googlecode.com/svn/trunk/doc/draftpep.txt
>
> === cut ===
> Because YAML does allow for highly readable configuration files, it
> is tempting to overlook its other flaws for the task. ?But a fully
> (or almost) compliant parser has to understand the whole YAML
> specification, and this is apparently expensive. ?Running the rst2pdf
> testsuite, without sphinx or most of the other optional packages, in
> "fast" mode (preloading all the modules, and then forking for every
> test) generates 161 smallish PDF files, totaling around 2.5 MB. ?On
> one test system this process takes 22 seconds. ?Disabling the _json C
> scanner and reading the configuration files using the json pure Python
> implementation adds about 0.3 seconds to the 22 seconds. ?But using
> pyyaml v. 3.09 instead of json adds 33 seconds to the 22 second process!
> It might seem that this is an edge case, but it makes it unacceptable to
> use YAML for this sort of testing, and taking 200 ms to read in 1000
> lines of simple JSON will be unacceptable in many other application
> domains as well.
> === cut ===
>
> I'd question your testing methodology. ?From your description, it looks like
> the _json speedup never was enabled. ?Also PyYAML provides optional bindings
> to libyaml, which makes parsing and emitting yaml much faster. ?In my tests,
> it parses a 10Mb file in 3 sec.
>
> === cut ===
> RSON semantics are based on JSON. ?Like JSON, an RSON document represents
> either a single scalar object, or a DAG (Directed Acyclic Graph), which
> may contain only a few simple data types.
> === cut ===
>
> JSON doesn't represent a DAG, at least, not an arbitrary DAG since each node
> in the document has no more than one parent. ?It would be more accurate to
> say that that it represents a tree-like structure.
>
> === cut ===
> The YAML syntax for supporting back-references was considered and deemed
> unsatisfactory. A human user who wants to put identical information in a
> "ship to" and "bill to" address is much more likely to use cut and paste
> than he is to understand and use backreferences, so the additional overhead
> of supporting more complex document structures is unwarranted.
>
> The concept of a "merge" in YAML, where two sub-trees of data can be
> merged together (similar to a recursive Python dictionary update)
> is quite useful, though, and will be copied. ?This does not alter the
> outcome that parsing a RSON file will result in a DAG, but does give
> more flexibility in the syntax that can be used to achieve a particular
> output DAG.
> === cut ===
>
> This paragraph assumes the reader is familiar with intricate details of the
> YAML grammar and semantics. ?I bet most of your audience are completely lost
> here.
>
> === cut ===
> Enhanced example::
>
> ? ?key1/key2a
> ? ? ? ?key3a = Some random string
> ? ? ? ?key3b = 42
> ? ?key1/key2a
> ? ? ? ?key3c
> ? ? ? ? ? ?1
> ? ? ? ? ? ?2
> ? ? ? ? ? ?{}
> ? ? ? ? ? ? ? ?key4a = anything
> ? ? ? ? ? ? ? ?key4b = something else
> ? ? ? ? ? ?[]
> ? ? ? ? ? ? ? ?a
> ? ? ? ? ? ? ? ?b
> ? ? ? ? ? ? ? ?c
> ? ? ? ? ? ?3
> ? ? ? ? ? ?4
> ? ?key1/key2b = [1, 2, 3, 4]
> ? ?key5 = ""
> ? ? ? This is a multi-line string. ?It is
> ? ? ? ? ?dedented to the farthest left
> ? ? ? ? ?column that is indented from
> ? ? ? ? ?the line containing "".
> ? ?key6 = [""]
> ? ? ? This is an array of strings, one per line.
> ? ? ? Each string is dedented appropriately.
> === cut ===
>
> Frankly, this is an example that only a mother could love. ?I'd suggest you
> to add some real-world examples, make sure they look nice and put them to
> the introductory part of the document. ?Examples is how the format will be
> evaluated by the readers, and yours don't stand a chance.
>
> Seriously, the only reason YAML enjoys its moderate popularity despite its
> overcomplicated grammar, chronic lack of manpower and deficient
> implementations is because it's so cute.
>
>
>
> Disclaimer: I'm the author of PyYAML and libyaml.
>
> Thanks,
> Kirill
>


From pmaupin at gmail.com  Mon Mar  1 21:21:37 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 1 Mar 2010 20:21:37 -0600
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <4B8C71BA.9060106@gamma.dn.ua>
References: <d09829f51002281809w2d2e556ct841f5adaaf78a723@mail.gmail.com>
	<4B8C71BA.9060106@gamma.dn.ua>
Message-ID: <d09829f51003011821m6ed8521dh3726d08b80da33ea@mail.gmail.com>

On Mon, Mar 1, 2010 at 8:02 PM, Kirill Simonov <xi at gamma.dn.ua> wrote:

BTW, congratulations on slogging through the YAML grammar to generate
such a good working C library!

That must have been a tremendous effort.

Regards,
Pat


From nipukumar at gmail.com  Mon Mar  1 21:39:54 2010
From: nipukumar at gmail.com (Niranjan Kumar Das)
Date: Mon, 1 Mar 2010 18:39:54 -0800
Subject: New User
Message-ID: <a9418ba51003011839h3f61d0c6r9af8cfc3181e6ff0@mail.gmail.com>

Hello Group,
I am starting to programme in python 1st time. Just thought i will ask the
group members about some well known useful books. I am looking for books at
two level.

a) For beginers
b) For Advaced user

Appreciate your help and suggestion in the matter.

Thanks,
Niranjan
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From xi at gamma.dn.ua  Mon Mar  1 21:54:51 2010
From: xi at gamma.dn.ua (Kirill Simonov)
Date: Mon, 01 Mar 2010 21:54:51 -0500
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <d09829f51003011819p70287a31k9edde871066294ff@mail.gmail.com>
References: <d09829f51002281809w2d2e556ct841f5adaaf78a723@mail.gmail.com>	
	<4B8C71BA.9060106@gamma.dn.ua>
	<d09829f51003011819p70287a31k9edde871066294ff@mail.gmail.com>
Message-ID: <4B8C7DFB.8000800@gamma.dn.ua>

Patrick Maupin wrote:
> Kirill:
> 
> Thank you for your constructive criticism.  This is the gem that made
> it worthwhile to post my document.  I think all of your points are
> spot-on, and I will be fixing the documentation.

You are welcome.  Despite what others have been saying, I don't think 
this area is closed to innovations.


> I can well believe that the C implementation of YAML is much faster
> than the Python one, but I am aiming for something that will be
> reasonably quick in pure Python.  I will double-check the JSON C test
> results, but something I probably did not make clear is that the 22
> seconds is not spent parsing -- that is for the entire test, which
> involves reading restructured text and generating some 160 separate
> PDF files.

Yes, this makes more sense.  It's quite possible that the pure-Python 
PyYAML parser is much slower than the pure-Python JSON parser.

At the same time, semantically meaningful whitespaces will likely hinder 
the pure-Python performance.  To make it fast, you'll need to convert 
the inner loops of the parser to regexps, and it is hard to support 
variable-length indentation with static regular expressions.


Thanks,
Kirill


From xi at gamma.dn.ua  Mon Mar  1 22:03:22 2010
From: xi at gamma.dn.ua (Kirill Simonov)
Date: Mon, 01 Mar 2010 22:03:22 -0500
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <d09829f51003011821m6ed8521dh3726d08b80da33ea@mail.gmail.com>
References: <d09829f51002281809w2d2e556ct841f5adaaf78a723@mail.gmail.com>	
	<4B8C71BA.9060106@gamma.dn.ua>
	<d09829f51003011821m6ed8521dh3726d08b80da33ea@mail.gmail.com>
Message-ID: <4B8C7FFA.4080909@gamma.dn.ua>

Patrick Maupin wrote:
> On Mon, Mar 1, 2010 at 8:02 PM, Kirill Simonov <xi at gamma.dn.ua> wrote:
> 
> BTW, congratulations on slogging through the YAML grammar to generate
> such a good working C library!
> 
> That must have been a tremendous effort.

The trick was to completely ignore the grammar described in the 
specification.  In fact, the syntax of YAML is pretty close the Python 
syntax and, with some effort, the Python scanner and parser could be 
adapted to parsing YAML.  Once I realized it, I got a working parser in 
a week or so.

Thanks,
Kirill


From anand.shashwat at gmail.com  Mon Mar  1 22:35:16 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Tue, 2 Mar 2010 09:05:16 +0530
Subject: New User
In-Reply-To: <a9418ba51003011839h3f61d0c6r9af8cfc3181e6ff0@mail.gmail.com>
References: <a9418ba51003011839h3f61d0c6r9af8cfc3181e6ff0@mail.gmail.com>
Message-ID: <d4ab53de1003011935r3873fd46jc09331f8c5903c40@mail.gmail.com>

for beginners :
http://openbookproject.net/thinkcs/python/english2e/index.html
python cookbook - 2 by alex martelli is fantastic if you have your basics
cleared.

On Tue, Mar 2, 2010 at 8:09 AM, Niranjan Kumar Das <nipukumar at gmail.com>wrote:

> Hello Group,
> I am starting to programme in python 1st time. Just thought i will ask the
> group members about some well known useful books. I am looking for books at
> two level.
>
> a) For beginers
> b) For Advaced user
>
> Appreciate your help and suggestion in the matter.
>
> Thanks,
> Niranjan
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From roy at panix.com  Mon Mar  1 23:27:41 2010
From: roy at panix.com (Roy Smith)
Date: Mon, 1 Mar 2010 20:27:41 -0800 (PST)
Subject: Adding to a module's __dict__?
Message-ID: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>

>From inside a module, I want to add a key-value pair to the module's
__dict__.  I know I can just do:

FOO = 'bar'

at the module top-level, but I've got 'FOO' as a string and what I
really need to do is

__dict__['Foo'] = 'bar'

When I do that, I get "NameError: name '__dict__' is not defined".  Is
it possible to do what I'm trying to do?


From tjreedy at udel.edu  Mon Mar  1 23:55:25 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 01 Mar 2010 23:55:25 -0500
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
Message-ID: <hmi5ns$57b$1@dough.gmane.org>

On 3/1/2010 7:56 PM, Patrick Maupin wrote:
> On Mar 1, 5:57 pm, Erik Max Francis<m... at alcyone.com>  wrote:
>> Patrick Maupin wrote:
>> This not only seriously stretching the meaning of the term "superset"
>> (as Python is most definitely not even remotely a superset of JSON), but
>
> Well, you are entitled to that opinion, but seriously, if I take valid
> JSON, replace unquoted true with True, unquoted false with False,
> replace unquoted null with None, and take the quoted strings and
> replace occurrences of \uXXXX with the appropriate unicode, then I do,
> in fact, have valid Python.  But don't take my word for it -- try it
> out!

To me this is so strained that I do not see why why you are arguing the 
point. So what? The resulting Python 'program' will be equivalent, I 
believe, to 'pass'. Ie, construct objects and then discard them with no 
computation or output. I suggest dropping this red-herring distraction.

> But if you really want to be pedantic about it, JavaScript (rather
> than Python) is, in fact a superset of JSON, and, despite the
> disparagement JavaScript receives, in my opinion, it is possible to
> write much better looking JavaScript than JSON for many tasks.
>
> YAML, also, is a superset of JSON, and IMO, it is possible to write
> much better looking YAML than JSON.

I agree that adding a bit of syntax to something can sometimes make it 
easier to write readable text. This is hardly a new idea and should not 
be controversial.  That is why people developed 'macro assembley' as a 
superset of 'assembly' languages and why, for instance, Python added the 
'with' statement.

I read your proposal. I have not needed config files and have never 
written json or yaml and so cannot really evaluate your proposal for 
something 'in between'. It does seem plausible that it could be useful.

While using the PEP format is great, calling your currently vaperware 
module proposal a 'standards track' PEP is somewhat off-putting and 
confusing. If Guido rejected it, would you simply drop the idea? If not, 
if you would continue it as a third-party module that would eventually 
be released and announced on PyPI, I seriously suggest renaming it to 
what it is.

Terry Jan Reedy



From clp2 at rebertia.com  Tue Mar  2 00:38:34 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 1 Mar 2010 21:38:34 -0800
Subject: Adding to a module's __dict__?
In-Reply-To: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>
Message-ID: <50697b2c1003012138k1a0083d0r3fc12fdfe5bc5857@mail.gmail.com>

On Mon, Mar 1, 2010 at 8:27 PM, Roy Smith <roy at panix.com> wrote:
> >From inside a module, I want to add a key-value pair to the module's
> __dict__. ?I know I can just do:
>
> FOO = 'bar'
>
> at the module top-level, but I've got 'FOO' as a string and what I
> really need to do is
>
> __dict__['Foo'] = 'bar'
>
> When I do that, I get "NameError: name '__dict__' is not defined". ?Is
> it possible to do what I'm trying to do?

Yes; just modify the dict returned by the globals() built-in function
instead. It's usually not wise to do this and is better to use a
separate dict instead, but I'll assume you know what you're doing and
have good reasons to disregard the standard advice due to your
use-case.

Cheers,
Chris
--
One should avoid using the Big Hammer unnecessarily,
but sometimes you really do need it and it's nice that it's available
for such cases.
http://blog.rebertia.com


From narkewoody at gmail.com  Tue Mar  2 00:48:33 2010
From: narkewoody at gmail.com (Steven Woody)
Date: Tue, 2 Mar 2010 13:48:33 +0800
Subject: How to find an COM object in using of pywin32
Message-ID: <ed4892841003012148j25ac9ca5v8d98ff363438ca10@mail.gmail.com>

Hi,

I want to interactive with an OLE application with pywin32.  The
problem is I get totally no idea how to find the object in OLEView and
how to figure out it's interface.

With pywin32's example, I even don't understand that in the below statement,

  win32com.client.Dispatch('Excel.Application')

that where the name 'Excel.Application' comes from?  In OLEView
(Microsoft's COM brower), I cannot find this name.


Could you give me any help?  Thanks


-- 
Life is the only flaw in an otherwise perfect nonexistence
    -- Schopenhauer

narke
public key at http://subkeys.pgp.net:11371 (narkewoody at gmail.com)


From vaidehi.pawar at yahoo.co.in  Tue Mar  2 01:50:05 2010
From: vaidehi.pawar at yahoo.co.in (Vaidehi Pawar)
Date: Tue, 2 Mar 2010 12:20:05 +0530 (IST)
Subject: No subject
Message-ID: <745414.12322.qm@web95110.mail.in2.yahoo.com>

http://adimteknikhirdavat.com/James.html


      The INTERNET now has a personality. YOURS! See your Yahoo! Homepage. http://in.yahoo.com/



From darcy at druid.net  Tue Mar  2 01:58:13 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Tue, 2 Mar 2010 01:58:13 -0500
Subject: taking python enterprise level?...
In-Reply-To: <778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>
	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>
	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>
Message-ID: <20100302015813.5397655e.darcy@druid.net>

On Mon, 1 Mar 2010 16:20:06 -0800 (PST)
mdipierro <massimodipierro71 at gmail.com> wrote:
> Joins are the bottle neck of most web app that relay on relational
> databases. That is why non-relational databases such as Google App
> Engine, CouchDB, MongoDB do not even support Joins. You have to try to
> minimize joins as much as possible by using tricks such as de-
> normalization and caching.

I keep seeing this statement but nothing to back it up.  I have created
many apps that run on Python with a PostgreSQL database with a fully
normalized schema and I can assure you that database joins were never
my problem unless I made a badly constructed query or left off a
critical index.

> I meant 512MB. The point is you need a lot of ram because you want to
> run multiple python instances, cache in ram as much as possible and
> also allow the database to buffer in ram as much as possible. You will
> see Ram usage tends to spike when you have lots of concurrent
> requests.

Put as much memory as you can afford/fit into your database server.
It's the cheapest performance boost you can get.  If you have a serious
application put at least 4GB into your dedicated database server.
Swapping is your enemy.

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


From arnodel at googlemail.com  Tue Mar  2 02:09:24 2010
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Tue, 02 Mar 2010 07:09:24 +0000
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
Message-ID: <m2r5o3xkrf.fsf@googlemail.com>

Erik Max Francis <max at alcyone.com> writes:

> Patrick Maupin wrote:
>> On Feb 28, 9:18 pm, Steven D'Aprano > Wait a minute... if JSON is too
>> hard to edit, and RSON is a *superset* of
>>> JSON, that means by definition every JSON file is also a valid RSON file.
>>> Since JSON is too hard to manually edit, so is RSON.
>>
>> Well, Python is essentially a superset of JSON, with string escape
>> handling being ever so slightly different, and using True instead of
>> true, False instead of false, and None instead of null.  YMMV, but I
>> find it possible, even probable, to write Python that is far easier to
>> edit than JSON, and in fact, I have used Python for configuration
>> files that are only to be edited by programmers or other technical
>> types.
>
> This not only seriously stretching the meaning of the term "superset"
> (as Python is most definitely not even remotely a superset of JSON),
> but still doesn't address the question.  Is RSON and _actual_ superset
> of JSON, or are you just misusing the term there, as well?  If it is,
> then your rationale for not using JSON makes no sense if you're making
> a new format that's merely a superset of it.  Obviously JSON can't be
> that unreadable if you're _extending_ it to make your own "more
> readable" format.  If JSON is unreadable, so must be RSON.

Your argument is utterly speculative as you are making clear you haven't
read the OP's proposal.

-- 
Arnaud


From techupdater.admin at gmail.com  Tue Mar  2 02:58:01 2010
From: techupdater.admin at gmail.com (Rishabh Verma)
Date: Mon, 1 Mar 2010 23:58:01 -0800 (PST)
Subject: OSSCamp Chandigarh April 2010 - Open Source Is The Future
Message-ID: <9ca0e032-94d2-47f0-8f88-e8113f9ad795@z10g2000prh.googlegroups.com>

Hello All,

OSSCamp is again being organized in Chandigarh on April 10, 2010. This
is another step ahead to foster the open source community in the city
beautiful. This event is a purely community organized event by some of
the open source evangelists of Chandigarh and it would be great if you
guys join us to make this event a great success. At a Camp, we love to
cross-talk, huddle together, raise some noise, celebrate technology,
argue over the coolest OS, fight on our fav programming languages,
discuss stuff, and what not!

OSScamp Chandigarh April 2010
April 10, 2009
Venue: To Be Decided
Time: 10AM - 6PM

You can register for the event at : http://chd.osscamp.in/

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From alfps at start.no  Tue Mar  2 03:42:46 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Tue, 02 Mar 2010 09:42:46 +0100
Subject: How to find an COM object in using of pywin32
In-Reply-To: <mailman.97.1267508914.23598.python-list@python.org>
References: <mailman.97.1267508914.23598.python-list@python.org>
Message-ID: <hmij28$3sj$1@news.eternal-september.org>

* Steven Woody:
> Hi,
> 
> I want to interactive with an OLE application with pywin32.  The
> problem is I get totally no idea how to find the object in OLEView and
> how to figure out it's interface.
> 
> With pywin32's example, I even don't understand that in the below statement,
> 
>   win32com.client.Dispatch('Excel.Application')
> 
> that where the name 'Excel.Application' comes from?  In OLEView
> (Microsoft's COM brower), I cannot find this name.

It's a "programmatic identifier" a.k.a. "progid".

It identifies a COM class and it's used as a readable but more 
name-collision-prone alternative to the 128-bit UUID.

You can find the programmatic identifiers in the Windows registry (use e.g. 
regedit); often they're not documented.


Cheers,

- Alf


From bruno.42.desthuilliers at websiteburo.invalid  Tue Mar  2 03:57:52 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 02 Mar 2010 09:57:52 +0100
Subject: Method / Functions - What are the differences?
In-Reply-To: <mailman.81.1267492052.23598.python-list@python.org>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
Message-ID: <4b8cd310$0$4604$426a34cc@news.free.fr>

John Posner a ?crit :
> On 3/1/2010 2:59 PM, Bruno Desthuilliers wrote:
> 
>> Answer here:
>>
>> http://groups.google.com/group/comp.lang.python/tree/browse_frm/thread/bd71264b6022765c/3a77541bf9d6617d#doc_89d608d0854dada0 
>>
>>
>> I really have to put this in the wiki :-/
> 
> 
> Bruno, I performed a light copy-edit of your writeup and put in some 
> reStructuredText (reST) markup. The result is at:
> 
>   http://cl1p.net/bruno_0301.rst/

Cool.

> 
> The only sentence that I think needs work is:
> 
>   Having access to itself (of course), the
>   instance (if there's one) and the class, it's easy for it
>   to wrap all this into a **method** object.
> 
> Maybe this?
> 
>   With the instance object (if any) and class object available,
>   it's easy to create a method object that wraps the function object.

That's perfect.

But there's also a typo to fix in the Python implementation of the 
Method object: in the call method, it should inject self.im_self as 
first arg, not self.im_func. This had been spotted by someone named John 
Posner, IIRC !-)


> 
> Begging pardon for my presumptuousness,

Begging pardon for my laziness :-/


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From fetchinson at googlemail.com  Tue Mar  2 05:09:54 2010
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Tue, 2 Mar 2010 11:09:54 +0100
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org>
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
Message-ID: <fbe2e2101003020209l27a6d1d3l7a1d04ffca40bbaf@mail.gmail.com>

>> > But you are working on a solution in search of a problem.  The really
>> > smart thing to do would be pick something more useful to work on.  We
>> > don't need another configuration language.  I can't even say "yet
>> > another" because there's already a "yet another" called yaml.
>>
>> And in case you are new here let me assure you that Paul is saying
>> this with his full intention of being helpful to you. I also would
>> think that working on such a project might be fun and educational for
>> you but completely useless if you have users other than yourself in
>> mind. Again, I'm trying to be helpful here, so you can focus on a
>> project that is both fun/educational for you and also potentially
>> useful for others. This RSON business is not one of them.
>
> OK, but I am a bit unclear on what you and/or Paul are claiming.  It
> could be one of a number of things.  For example:
>
> - There is a preexisting file format suitable for my needs, so I
> should not invent another one.

I suspect this to be true, if we mean the same thing by "configuration
file format". Especially if RSON will be a superset of JSON.

> - If I invent a file format suitable for my needs, it couldn't
> possibly be general enough for anybody else.

Quite possibly, the reason is that the already existing file formats
have an ecosystem around them that make them attractive. Your file
format will have to cope with this barrier to attract new users which
I think will be very difficult, given the wide range of already
existing formats, covering just about any use case.

> - Even if it was general enough for somebody else, there would only be
> two of them.

See above.

> I've been known to waste time (or be accused of wasting time) on
> various endeavors, but I like to know exactly *why* it is perceived to
> be a waste.

Don't get me wrong, I also waste lot of time on hobby/fun/educational
projects ("waste" in this case is only meant as "useless for others",
not "useless for me") because it's, well, hobby and fun and
educational :) It's just good to know if a given project is in this
category or outside.

Cheers,
Daniel



-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From jeanmichel at sequans.com  Tue Mar  2 05:29:33 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Tue, 02 Mar 2010 11:29:33 +0100
Subject: Adding to a module's __dict__?
In-Reply-To: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>
Message-ID: <4B8CE88D.8030404@sequans.com>

Roy Smith wrote:
> >From inside a module, I want to add a key-value pair to the module's
> __dict__.  I know I can just do:
>
> FOO = 'bar'
>
> at the module top-level, but I've got 'FOO' as a string and what I
> really need to do is
>
> __dict__['Foo'] = 'bar'
>
> When I do that, I get "NameError: name '__dict__' is not defined".  Is
> it possible to do what I'm trying to do?
>   
test.py:

import sys
varName= 'foo'
setattr(sys.modules[__name__], varName, 42)



in a shell:
import test

print test.foo
 >>> 42


JM


From no-spam at non-existing.invalid  Tue Mar  2 06:11:10 2010
From: no-spam at non-existing.invalid (Robert)
Date: Tue, 02 Mar 2010 12:11:10 +0100
Subject: (and about tests) Re: Pedantic pickling error after reload?
In-Reply-To: <7uq299FrmfU1@mid.uni-berlin.de>
References: <hm6aru$514$1@news.albasani.net> <7uo1aqFitnU1@mid.uni-berlin.de>
	<hm8de7$ct5$1@news.albasani.net> <7uq299FrmfU1@mid.uni-berlin.de>
Message-ID: <hmirq4$ne8$2@news.albasani.net>

>> well, reloading is the thing which I do most in coding practice :-)
>> For me its a basic thing like cell proliferation in biology.
>
> I simply never do it. It has subtle issues, one of them you found,
> others you say you work around by introducing actual frameworks. But you
> might well forget some corner-cases & suddently chase a chimera you deem
> a bug, that in fact is just an unwanted side-effect of reloading.

well, at dev time there is a different rule: the more bugs, the better

(they can raise/indicate certain design and coding weaknesses)

>
> And all this extra complexity is only good for the process of actually
> changing the code. It doesn't help you maintaining code quality.

neither does a improved editor, interactive/debugging/reload 
scheme replace tests, nor do tests replace them the other way 
around. different dimensions. just the benefactions on all levels 
radiate recursively of course ...
e.g. by a good reload scheme one can even work the tests out 
better (and debug more efficiently when the tests bump).

that little reload support code is a rather constant small stub 
compared to the app size (unless with trivial 1-day apps maybe).
Most 'utility' modules don't need extra care at all.
Plus maybe 1 .. 5 extra lines per few frequently changed GUI 
classes (when well organized) and some 5..10 lines for 
preserving/re-fixing the few application data anchors. Thats all. 
No need to get it fully consistent, as serves its purpose when 
editing during runtime is possible in 'most cases'. And most edit 
cases during debug sessions are typically just small fixes and 
touches of function code. One fix revealing the next follow-up bug 
.. beautifying things .. as it is.
critical data structure changes are very rare occasions.

A general reload scheme ("edit at runtime") zeroes out most 
effectively a core time consumer while exploring, iterating, 
debugging, smoothing ..
On the time scale of these tasks, this effect can in my opinion by 
far not be matched equivalently by setup code of whatever kind in 
non-trivial apps. (As I did/do this before or with less dynamic 
programming languages)

>> I typically need just 1 full app reboot on 20..50 edit-run-cycles I
>> guess. And just few unit test runs per release. Even for
>> Cython/pyximport things I added support for this reload edit-run-cycle,
>> because I cannot imagine to dev without this.
>
> Let me assure you - it works :)
>
> for example yesterday, I create a full CRUD-interface for a web-app
> (which is the thing I work on mostly these days) without *once* taking a
> look at the browser. I wrote actions, forms, HTML, and tests along,
> developed the thing ready, asserted certain constraints and error-cases,
> and once finished, fired up the browser - and he saw, it worked!
>
> Yes, I could have written that code on the fly, hitting F5 every few
> seconds/minutes to see if things work out (instead of just running the
> specific tests through nose) - and once I'd be finished, I didn't have
> anything permanent that ensured the functionality over time.

well in this 1-day example you coded a thing which obviously you 
had already done similarly several times. still I guess, you had 
some debug session too. some exploration of new things and new 
aspects. profiting e.g. particularly from the Python interactive / 
interactive debugger, post mortem etc. ..
unless you type so perfect from scratch as that guy in Genesis 1 :-)

>> this is a comfortable quasi religious theory raised often and easily
>> here and there - impracticable and very slow on that fine grained code
>> evolution level however. an interesting issue.
>
> To me, that's as much as an religious statement often heard by people
> that aren't (really) into test-driven development. By which I personally
> don't mean the variant where one writes tests first, and then code. I
> always develop both in lock-step, sometimes introducing a new feauter
> first in my test as e.g. new arguments, or new calls, and then
> implementing them, but as often the other way round.
>
> The argument is always a variation of "my problem is to complicated, the
> code-base to interviened to make it possible to test this".

well, nothing against preaching about tests ;-) , unless its too 
much.
like with every extreme there is also a threshold where you don't 
draw anymore at the bottom line by adding more tests. there are 
costs too. other bottle necks ...

its not against test writing for testing/validating/stabilizing 
and other indirect high-level benefactions. there are simply other 
dimensions too, which are worth a thought or two. the question 
about a good reload scheme is more oriented towards the 
debugging/interactive/exploration/editing level. things, where 
particularly Python opens new dimensions by its superior dynamic 
and self-introspective nature.

> I call this a bluff. You might work with a code-base that makes it
> harder than needed to write tests for new functionality. But then, most
> of the time this is a sign of lack of design. Writing with testability
> in mind makes you think twice about how to proper componentize your
> application, clearly separate logic from presentation, validates
> API-design because using the API is immediatly done when writing the
> tests you need, and so forth.

yes, tests writing can also induce a better code modularization.
a good editor, good debugging/reload scheme etc also radiate... 
the test runner can be connected to the post mortem 
debugger/interactive and so on.

>> "Reload > pychecker/pylint > tests" works most effectively with Python
>> in my opinion.
>> And for GUI-development the difference is max.
>> (min for math algorithms which are well away from data structures/OO)
>
> As I said, I mainly do web these days. Which can be considered GUIs as
> well. Testing the HTTP-interface is obviously easier & possible, and
> what I described earlier.
>
> But we also use selenium to test JS-driven interfaces, as now the
> complexity of the interface rises, with all the bells & whistles of
> ajaxiness and whatnot.

(the CRUD approach on 'form handling IO level' as it is typically 
more simple regarding tests writing than GUI programming - because 
of the atomic operations and straight interface. similar like alg 
and I/O testing.
While test writing for a flattery JS/CSS-heavy multi-language 
multi-state web GUIs (with subtle user interactions) is perhaps 
similar complex than doing it for a desktop GUI app I think.
)

>> A rule that unit tests are used only near a release or a milestone is
>> healthy in that sense I think.
>> (And a quick edit-(real)run-interact cycle is good for speed)
>
> Nope, not in my opinion. Making tests an afterthought may well lead to
> them being written carelessly, not capturing corner-cases you

Anyway one can formulate/write tests on each error/problem/design 
question which one thinks is worth a test.

A interesting question may be however: if the tests (both: unit 
tests and auto code checks) should be _run_ permanently - in order 
to lets say have a 'zero test dump status' overall every few 
minutes, at the time scale of editing/exploring/debugging ?

I think that one doesn't loose on the savety net effect, but one 
wins on overall validation power of the tests, when one _uses_ the 
(new and old) tests not too often: more rarely/later/before the 
'release'. because after many things are rewired in the code 
(incl. test code) for a milestone/release step or, each bump which 
arises fresh, lets you think/cure about the network effects and 
deeper effect of errors in common, similar contexts etc.

While when one makes the code fit against the 'few artificial 
tests' (which are always very/too few!) too fast on the wrong time 
scale, its like in that example of quick antibiotica 
application/abuse: the cure for the bumps then tend to be too 
short sighted. symptom curing. while the clever bugs arise in 
background ...

having fresh written tests unused for some time is no problem, 
because they will induce there own debug session sooner or later ..

> Testing is no silver bullet. But it's a rather mighte sword.. :)
>

I'd say testing has its place amongst other things and dimensions 
like (incomplete):

Editor:      type, browse
Language:    formulate
Interactive: inspect, try
Debug:       inspect, fix
Reload:      fix, iterate, explore, clean
Design:      organize
Code checks: stabilize
Unit tests:  stabilize
Feedback:    realize

Each issue can be improved. effective in overall speed. He saw:

If you have no good editor there is some 1.5 .. 2 x less dev 
speed. If you have no Python (Ruby, Groovy...) there is some 1.5 
.. 2 x less dev speed. If you have no good Interactive/Debugging 
there is some 1.5 .. 2 x less dev speed. If you have no improved 
reload scheme there is another 1.5 .. 2 x less dev speed. If you 
have no good design scheme there is another 1.5 .. 2 x less dev 
speed. If you have no good code checks there is another 1.5 .. 2 x 
less dev speed. If you have no good test scheme there is another 
1.5 .. 2 x less dev speed. If you have no good bug report scheme 
there is another 1.5 .. 2 x less dev speed. ...

A improved reload scheme may even speed up at the center of the 
development wheel: iteration. I guess I underrated...


Robert


From emannion at gmail.com  Tue Mar  2 06:34:16 2010
From: emannion at gmail.com (enda man)
Date: Tue, 2 Mar 2010 03:34:16 -0800 (PST)
Subject: Call Signtool using python
Message-ID: <24bf5006-db86-4415-89ec-c5eab8f1c740@x22g2000yqx.googlegroups.com>

Hi,

I want to call the Windows signtool to sign a binary from a python
script.

Here is my script:
//
os.chdir('./Install/activex/cab')
subprocess.call(["signtool", "sign", "/v", "/f", "webph.pfx", "/t",
"http://timestamp.verisign.com/scripts/timstamp.dll", "WebPh.exe" ])
//

But I am getting this error:
////
SignTool Error: The specified PFX password is not correct.

Number of files successfully Signed: 0
Number of warnings: 0
Number of errors: 1
Finished building plugin installer
scons: done building targets.
////


This python script is called as part of a scons build, which is also
python code.

Anyone seen this before or can pass on any ideas.
Tks,
EM




From wuwei23 at gmail.com  Tue Mar  2 07:50:25 2010
From: wuwei23 at gmail.com (alex23)
Date: Tue, 2 Mar 2010 04:50:25 -0800 (PST)
Subject: Verifying My Troublesome Linkage Claim between Python and Win7
References: <hm0jn4$tnf$1@news.eternal-september.org>
Message-ID: <f75d9438-412a-4494-9918-527a1cd7b960@a5g2000prg.googlegroups.com>

"W. eWatson" <wolftra... at invalid.com> wrote:
> My claim is that if one creates a program in a folder that reads a file
> in the folder it and then copies it to another folder, it will read ?the
> data file in the first folder, and not a changed file in the new folder.
> I'd appreciate it if some w7 users could try this, and let me know what
> they find.

On a fresh install of Win7 Ultimate, I created your program & the text
file in one folder, then copied the program both using ctrl-c/ctrl-v
and later ctrl-drag-&-drop. In both cases, the copied program *did
not* refer to the text file when executed:

D:\projects>a
Traceback (most recent call last):
  File "D:\projects\a.py", line 1, in <module>
    track_file = open("verify.txt")
IOError: [Errno 2] No such file or directory: 'verify.txt'

Whatever you seem to think you did, you didn't, or you're not
providing enough detail on what you did to repeat the behaviour.

I do agree with the sentiment that this isn't a Python issue.


From vriolk at gmail.com  Tue Mar  2 08:12:37 2010
From: vriolk at gmail.com (coldpizza)
Date: Tue, 2 Mar 2010 05:12:37 -0800 (PST)
Subject: How to use python to register a service (an existing .exe file)
References: <4b79e28c$0$4610$426a74cc@news.free.fr>
Message-ID: <7655fe5a-3f37-4835-8fa2-cf95928ef124@q16g2000yqq.googlegroups.com>

instsrv.exe does not come with Windows by default, but I guess it
should be possible to add a service using the win32 built-in `sc`
command line tool.

Try `sc create` from a console.

The app you want to install as a service will still have to be
compliant with the win32 service interface, otherwise it will throw an
error, although the app will still be started.

On Feb 16, 2:10?am, News123 <news... at free.fr> wrote:
> Hi,
>
> Is there a python way to register new windows services.
>
> I am aware of the
> instsrv.exe program, which can be used to install services.
> I could use subprocess.Popen to call
>
> instsrv.exe "service_name" program.exe
>
> but wondered, whether there's already an existing function.
>
> Thans in advance and bye
>
> N



From roy at panix.com  Tue Mar  2 08:21:03 2010
From: roy at panix.com (Roy Smith)
Date: Tue, 02 Mar 2010 08:21:03 -0500
Subject: Adding to a module's __dict__?
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>
	<mailman.96.1267508316.23598.python-list@python.org>
Message-ID: <roy-3CB7A4.08210202032010@news.panix.com>

In article <mailman.96.1267508316.23598.python-list at python.org>,
 Chris Rebert <clp2 at rebertia.com> wrote:

> On Mon, Mar 1, 2010 at 8:27 PM, Roy Smith <roy at panix.com> wrote:
> > >From inside a module, I want to add a key-value pair to the module's
> > __dict__. ??I know I can just do:
> >
> > FOO = 'bar'
> >
> > at the module top-level, but I've got 'FOO' as a string and what I
> > really need to do is
> >
> > __dict__['Foo'] = 'bar'
> >
> > When I do that, I get "NameError: name '__dict__' is not defined". ??Is
> > it possible to do what I'm trying to do?
> 
> Yes; just modify the dict returned by the globals() built-in function
> instead.

Ah, cool.  Thanks.

> It's usually not wise to do this and is better to use a
> separate dict instead, but I'll assume you know what you're doing and
> have good reasons to disregard the standard advice due to your
> use-case.

Why is it unwise?

The use case is I'm importing a bunch of #define constants from a C header 
file.  I've got triples that I want to associate; the constant name, the 
value, and a string describing it.  The idea is I want to put in the 
beginning of the module:

declare('XYZ_FOO', 0, "The foo property")
declare('XYZ_BAR', 1, "The bar property")
declare('XYZ_BAZ', 2, "reserved for future use")

and so on.  I'm going to have hundreds of these, so ease of use, ease of 
maintenance, and niceness of presentation are important.

My declare() function will not just set XYZ_FOO = 1 at module global scope, 
but also insert entries in a variety of dicts so I can look up the 
description string, map from a value back to the constant name, etc.

I *could* do this in a separate dict, but the notational convenience of 
being able to have the original constant names globally available is pretty 
important.


From steve at holdenweb.com  Tue Mar  2 08:33:11 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 02 Mar 2010 08:33:11 -0500
Subject: Adding to a module's __dict__?
In-Reply-To: <roy-3CB7A4.08210202032010@news.panix.com>
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>	<mailman.96.1267508316.23598.python-list@python.org>
	<roy-3CB7A4.08210202032010@news.panix.com>
Message-ID: <4B8D1397.5050507@holdenweb.com>

Roy Smith wrote:
> In article <mailman.96.1267508316.23598.python-list at python.org>,
>  Chris Rebert <clp2 at rebertia.com> wrote:
> 
>> On Mon, Mar 1, 2010 at 8:27 PM, Roy Smith <roy at panix.com> wrote:
>>> >From inside a module, I want to add a key-value pair to the module's
>>> __dict__. ? I know I can just do:
>>>
>>> FOO = 'bar'
>>>
>>> at the module top-level, but I've got 'FOO' as a string and what I
>>> really need to do is
>>>
>>> __dict__['Foo'] = 'bar'
>>>
>>> When I do that, I get "NameError: name '__dict__' is not defined". ? Is
>>> it possible to do what I'm trying to do?
>> Yes; just modify the dict returned by the globals() built-in function
>> instead.
> 
> Ah, cool.  Thanks.
> 
>> It's usually not wise to do this and is better to use a
>> separate dict instead, but I'll assume you know what you're doing and
>> have good reasons to disregard the standard advice due to your
>> use-case.
> 
> Why is it unwise?
> 
> The use case is I'm importing a bunch of #define constants from a C header 
> file.  I've got triples that I want to associate; the constant name, the 
> value, and a string describing it.  The idea is I want to put in the 
> beginning of the module:
> 
> declare('XYZ_FOO', 0, "The foo property")
> declare('XYZ_BAR', 1, "The bar property")
> declare('XYZ_BAZ', 2, "reserved for future use")
> 
> and so on.  I'm going to have hundreds of these, so ease of use, ease of 
> maintenance, and niceness of presentation are important.
> 
> My declare() function will not just set XYZ_FOO = 1 at module global scope, 
> but also insert entries in a variety of dicts so I can look up the 
> description string, map from a value back to the constant name, etc.
> 
> I *could* do this in a separate dict, but the notational convenience of 
> being able to have the original constant names globally available is pretty 
> important.
> 
And how important is it to make sure that whatever data your program
processes doesn't overwrite the actual variable names you want to use to
program the processing?

If you use this technique you are effectively making your program a
hostage to fortune, as you no longer control the namespace you are using
for the programming.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/


From steve at holdenweb.com  Tue Mar  2 08:33:11 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 02 Mar 2010 08:33:11 -0500
Subject: Adding to a module's __dict__?
In-Reply-To: <roy-3CB7A4.08210202032010@news.panix.com>
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>	<mailman.96.1267508316.23598.python-list@python.org>
	<roy-3CB7A4.08210202032010@news.panix.com>
Message-ID: <4B8D1397.5050507@holdenweb.com>

Roy Smith wrote:
> In article <mailman.96.1267508316.23598.python-list at python.org>,
>  Chris Rebert <clp2 at rebertia.com> wrote:
> 
>> On Mon, Mar 1, 2010 at 8:27 PM, Roy Smith <roy at panix.com> wrote:
>>> >From inside a module, I want to add a key-value pair to the module's
>>> __dict__. ? I know I can just do:
>>>
>>> FOO = 'bar'
>>>
>>> at the module top-level, but I've got 'FOO' as a string and what I
>>> really need to do is
>>>
>>> __dict__['Foo'] = 'bar'
>>>
>>> When I do that, I get "NameError: name '__dict__' is not defined". ? Is
>>> it possible to do what I'm trying to do?
>> Yes; just modify the dict returned by the globals() built-in function
>> instead.
> 
> Ah, cool.  Thanks.
> 
>> It's usually not wise to do this and is better to use a
>> separate dict instead, but I'll assume you know what you're doing and
>> have good reasons to disregard the standard advice due to your
>> use-case.
> 
> Why is it unwise?
> 
> The use case is I'm importing a bunch of #define constants from a C header 
> file.  I've got triples that I want to associate; the constant name, the 
> value, and a string describing it.  The idea is I want to put in the 
> beginning of the module:
> 
> declare('XYZ_FOO', 0, "The foo property")
> declare('XYZ_BAR', 1, "The bar property")
> declare('XYZ_BAZ', 2, "reserved for future use")
> 
> and so on.  I'm going to have hundreds of these, so ease of use, ease of 
> maintenance, and niceness of presentation are important.
> 
> My declare() function will not just set XYZ_FOO = 1 at module global scope, 
> but also insert entries in a variety of dicts so I can look up the 
> description string, map from a value back to the constant name, etc.
> 
> I *could* do this in a separate dict, but the notational convenience of 
> being able to have the original constant names globally available is pretty 
> important.
> 
And how important is it to make sure that whatever data your program
processes doesn't overwrite the actual variable names you want to use to
program the processing?

If you use this technique you are effectively making your program a
hostage to fortune, as you no longer control the namespace you are using
for the programming.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From jjposner at optimum.net  Tue Mar  2 09:17:00 2010
From: jjposner at optimum.net (John Posner)
Date: Tue, 02 Mar 2010 09:17:00 -0500
Subject: Method / Functions - What are the differences?
In-Reply-To: <4b8cd310$0$4604$426a34cc@news.free.fr>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>	<4b8c2a34$0$10470$426a74cc@news.free.fr>	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
Message-ID: <hmj6k0$c7u$1@dough.gmane.org>

On 3/2/2010 3:57 AM, Bruno Desthuilliers wrote:
>>
>> With the instance object (if any) and class object available,
>> it's easy to create a method object that wraps the function object.
>
> That's perfect.


Fixed.

> But there's also a typo to fix in the Python implementation of the
> Method object: in the call method, it should inject self.im_self as
> first arg, not self.im_func. This had been spotted by someone named John
> Posner, IIRC !-)


Fixed (oops!).

I've updated the text at this location:

 >   http://cl1p.net/bruno_0301.rst/

I think the ball is back in your court, Bruno. I'd be happy to help more 
-- feel free to contact me off-list, at jjposner at optimum.net.

Best,
John



From marduk at python.net  Tue Mar  2 09:24:58 2010
From: marduk at python.net (Albert Hopkins)
Date: Tue, 02 Mar 2010 09:24:58 -0500
Subject: os.fdopen() issue in Python 3.1?
Message-ID: <1267539898.477222.7.camel@necropolis>

I have a snippet of code that looks like this:

        pid, fd = os.forkpty()
        if pid == 0:
            subprocess.call(args)
        else:
            input = os.fdopen(fd).read()
        ...


This seems to work find for CPython 2.5 and 2.6 on my Linux system.
However, with CPython 3.1 I get:

            input = os.fdopen(fd).read()
        IOError: [Errno 5] Input/output error

Is there something wrong in Python 3.1?  Is this the correct way to do
this (run a process in a pseudo-tty and read it's output) or is there
another way I should/could be doing this?

-a




From mwilson at the-wire.com  Tue Mar  2 09:26:06 2010
From: mwilson at the-wire.com (Mel)
Date: Tue, 02 Mar 2010 09:26:06 -0500
Subject: Adding to a module's __dict__?
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>
	<mailman.96.1267508316.23598.python-list@python.org>
	<roy-3CB7A4.08210202032010@news.panix.com>
Message-ID: <hmj785$lrm$1@speranza.aioe.org>

Roy Smith wrote:
[ ... ]
> Why is it unwise?
> 
> The use case is I'm importing a bunch of #define constants from a C header
> file.  I've got triples that I want to associate; the constant name, the
> value, and a string describing it.  The idea is I want to put in the
> beginning of the module:
> 
> declare('XYZ_FOO', 0, "The foo property")
> declare('XYZ_BAR', 1, "The bar property")
> declare('XYZ_BAZ', 2, "reserved for future use")
> 
> and so on.  I'm going to have hundreds of these, so ease of use, ease of
> maintenance, and niceness of presentation are important.

As long as the header file says what you think it says, you're fine.  If you 
encounter a file that does "#define sys", then the sys module is forever 
masked, and your module can't invoke it.  A header file that contains 
"#define declare" will be fun.

	Mel.




From mmitchell at transparent.com  Tue Mar  2 09:46:21 2010
From: mmitchell at transparent.com (Matt Mitchell)
Date: Tue, 2 Mar 2010 09:46:21 -0500
Subject: Call Signtool using python
In-Reply-To: <24bf5006-db86-4415-89ec-c5eab8f1c740@x22g2000yqx.googlegroups.com>
References: <24bf5006-db86-4415-89ec-c5eab8f1c740@x22g2000yqx.googlegroups.com>
Message-ID: <E3F00F47584F1944B69461EF94D1A7490A03D508@transparent3.transparent.local>

I think you need to use the /p switch to pass signtool.exe a password
when using the /f switch.
Check out
http://msdn.microsoft.com/en-us/library/8s9b9yaz%28VS.80%29.aspx for
more info.



 
-----------------------------------
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-----Original Message-----
From: python-list-bounces+mmitchell=transparent.com at python.org
[mailto:python-list-bounces+mmitchell=transparent.com at python.org] On
Behalf Of enda man
Sent: Tuesday, March 02, 2010 6:34 AM
To: python-list at python.org
Subject: Call Signtool using python

Hi,

I want to call the Windows signtool to sign a binary from a python
script.

Here is my script:
//
os.chdir('./Install/activex/cab')
subprocess.call(["signtool", "sign", "/v", "/f", "webph.pfx", "/t",
"http://timestamp.verisign.com/scripts/timstamp.dll", "WebPh.exe" ])
//

But I am getting this error:
////
SignTool Error: The specified PFX password is not correct.

Number of files successfully Signed: 0
Number of warnings: 0
Number of errors: 1
Finished building plugin installer
scons: done building targets.
////


This python script is called as part of a scons build, which is also
python code.

Anyone seen this before or can pass on any ideas.
Tks,
EM


-- 
http://mail.python.org/mailman/listinfo/python-list


From lutz at learning-python.com  Tue Mar  2 10:11:41 2010
From: lutz at learning-python.com (Mark Lutz)
Date: Tue, 2 Mar 2010 07:11:41 -0800 (PST)
Subject: Python training in Florida, April 27-29
Message-ID: <70339c5d-a874-4610-a528-787f18855a4c@y17g2000yqd.googlegroups.com>

Tired of the Winter weather?  Make your plans now to
attend our upcoming Florida Python training seminar
in April.  This 3-day public class will be held on
April 27-29, in Sarasota, Florida.  It is open to
both individual and group enrollments.

For more details on the class, as well as registration
instructions, please visit the class web page:

http://learning-python.com/2010-public-classes.html

Note that we have moved to a new domain name.  If you
are unable to attend in April, our next Sarasota class
is already scheduled for July 13-15.

Thanks, and we hope to see you at a Python class in
sunny and warm Florida soon.

--Mark Lutz at learning-python.com


From roy at panix.com  Tue Mar  2 10:19:56 2010
From: roy at panix.com (Roy Smith)
Date: Tue, 2 Mar 2010 07:19:56 -0800 (PST)
Subject: Adding to a module's __dict__?
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>
	<mailman.96.1267508316.23598.python-list@python.org>
	<roy-3CB7A4.08210202032010@news.panix.com> 
	<mailman.107.1267536800.23598.python-list@python.org>
Message-ID: <f4c188f0-7dba-4629-8a16-eed713b5920f@15g2000yqa.googlegroups.com>

On Mar 2, 8:33?am, Steve Holden <st... at holdenweb.com> wrote:

> And how important is it to make sure that whatever data your program
> processes doesn't overwrite the actual variable names you want to use to
> program the processing?

Oh, I see what you're saying.  You're thinking I was going to machine-
process the C header file and pattern-match the #define statements?
Actually, I was just hand-copying the values, and was looking for a
way to reduce typing.

But, I suppose if I were to machine-process the header files, that
would be a concern.  I suppose in that case I would make sure I only
inserted variables which matched a particular pattern (ie, "[A-Z]+_[A-
Z][A-Z0-9]+").  In fact, now that you got me thinking in that
direction...

Somewhat sadly, in my case, I can't even machine process the header
file.  I don't, strictly speaking, have a header file.  What I have is
a PDF which documents what's in the header file, and I'm manually re-
typing the data out of that.  Sigh.



From victorsubervi at gmail.com  Tue Mar  2 10:48:19 2010
From: victorsubervi at gmail.com (Victor Subervi)
Date: Tue, 2 Mar 2010 11:48:19 -0400
Subject: Email Script
Message-ID: <4dc0cfea1003020748g786aded2i9c5287972aa8984c@mail.gmail.com>

Hi;
I have the following code:

def my_mail():
  user, passwd, db, host = login()
  database = MySQLdb.connect(host, user, passwd, db)
  cursor= database.cursor()
  ourEmail1 = 'marilyn at globalsolutionsgroup.vi'
  ourEmail1 = 'phil at globalsolutionsgroup.vi'
  ourEmail2 = 'benoismyname at gmail.com'
  form = cgi.FieldStorage()
  name = form.getfirst('name', '')
  email = form.getfirst('from', '')
  message = form.getfirst('message', '')
  message = 'Name: %s\nMessage: %s' % (name, message)
  subject = 'Message from Web Site'
  Email(
      from_address = email,
      to_address = ourEmail1,
      subject = subject,
      message = message
  ).send()
  Email(
      from_address = email,
      to_address = ourEmail2,
      subject = subject,
      message = message
  ).send()
  print 'Thank you, %s, we will get back to you shortly!<br />' % (name)

This sends only the first of the two emails. Why doesn't it work to send the
second? What do?
TIA,
beno

-- 
The Logos has come to bear
http://logos.13gems.com/
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From victorsubervi at gmail.com  Tue Mar  2 10:53:10 2010
From: victorsubervi at gmail.com (Victor Subervi)
Date: Tue, 2 Mar 2010 11:53:10 -0400
Subject: Email Script
In-Reply-To: <4dc0cfea1003020748g786aded2i9c5287972aa8984c@mail.gmail.com>
References: <4dc0cfea1003020748g786aded2i9c5287972aa8984c@mail.gmail.com>
Message-ID: <4dc0cfea1003020753g404e6fbcr29ed52e21e2bb18c@mail.gmail.com>

On Tue, Mar 2, 2010 at 11:48 AM, Victor Subervi <victorsubervi at gmail.com>wrote:

> Hi;
> I have the following code:
>
> def my_mail():
>   user, passwd, db, host = login()
>   database = MySQLdb.connect(host, user, passwd, db)
>   cursor= database.cursor()
>   ourEmail1 = 'marilyn at globalsolutionsgroup.vi'
>   ourEmail1 = 'phil at globalsolutionsgroup.vi'
>   ourEmail2 = 'benoismyname at gmail.com'
>   form = cgi.FieldStorage()
>   name = form.getfirst('name', '')
>   email = form.getfirst('from', '')
>   message = form.getfirst('message', '')
>   message = 'Name: %s\nMessage: %s' % (name, message)
>   subject = 'Message from Web Site'
>   Email(
>       from_address = email,
>       to_address = ourEmail1,
>       subject = subject,
>       message = message
>   ).send()
>   Email(
>       from_address = email,
>       to_address = ourEmail2,
>       subject = subject,
>       message = message
>   ).send()
>   print 'Thank you, %s, we will get back to you shortly!<br />' % (name)
>
> This sends only the first of the two emails. Why doesn't it work to send
> the second? What do?
> TIA,
> beno
>

Should I put a timer between instances of Email?

>
>
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From steve at holdenweb.com  Tue Mar  2 11:14:37 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 02 Mar 2010 11:14:37 -0500
Subject: Adding to a module's __dict__?
In-Reply-To: <f4c188f0-7dba-4629-8a16-eed713b5920f@15g2000yqa.googlegroups.com>
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>	<mailman.96.1267508316.23598.python-list@python.org>	<roy-3CB7A4.08210202032010@news.panix.com>
	<mailman.107.1267536800.23598.python-list@python.org>
	<f4c188f0-7dba-4629-8a16-eed713b5920f@15g2000yqa.googlegroups.com>
Message-ID: <hmjdhf$f3r$1@dough.gmane.org>

Roy Smith wrote:
> On Mar 2, 8:33 am, Steve Holden <st... at holdenweb.com> wrote:
> 
>> And how important is it to make sure that whatever data your program
>> processes doesn't overwrite the actual variable names you want to use to
>> program the processing?
> 
> Oh, I see what you're saying.  You're thinking I was going to machine-
> process the C header file and pattern-match the #define statements?
> Actually, I was just hand-copying the values, and was looking for a
> way to reduce typing.
> 
> But, I suppose if I were to machine-process the header files, that
> would be a concern.  I suppose in that case I would make sure I only
> inserted variables which matched a particular pattern (ie, "[A-Z]+_[A-
> Z][A-Z0-9]+").  In fact, now that you got me thinking in that
> direction...
> 
> Somewhat sadly, in my case, I can't even machine process the header
> file.  I don't, strictly speaking, have a header file.  What I have is
> a PDF which documents what's in the header file, and I'm manually re-
> typing the data out of that.  Sigh.
> 
Don't worry. Now you have revealed the *real* problem you may well find
there are c.l.py readers who can help! Python can read PDFs ...

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From jjposner at optimum.net  Tue Mar  2 11:18:02 2010
From: jjposner at optimum.net (John Posner)
Date: Tue, 02 Mar 2010 11:18:02 -0500
Subject: Adding to a module's __dict__?
In-Reply-To: <f4c188f0-7dba-4629-8a16-eed713b5920f@15g2000yqa.googlegroups.com>
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>
	<mailman.96.1267508316.23598.python-list@python.org>
	<roy-3CB7A4.08210202032010@news.panix.com>
	<mailman.107.1267536800.23598.python-list@python.org>
	<f4c188f0-7dba-4629-8a16-eed713b5920f@15g2000yqa.googlegroups.com>
Message-ID: <4B8D3A3A.8030501@optimum.net>

On 3/2/2010 10:19 AM, Roy Smith wrote:
>
> Somewhat sadly, in my case, I can't even machine process the header
> file.  I don't, strictly speaking, have a header file.  What I have is
> a PDF which documents what's in the header file, and I'm manually re-
> typing the data out of that.  Sigh.

Here's an idea, perhaps too obvious, to minimize your keystrokes:

1. Create a text file with the essential data:

XYZ_FOO   0  The foo property
XYZ_BAR   1  The bar property
XYZ_BAZ   2  reserved for future use

2. Use a Python script to convert this into the desired code:

declare('XYZ_FOO', 0, "The foo property")
declare('XYZ_BAR', 1, "The bar property")
declare('XYZ_BAZ', 2, "reserved for future use")

Note:

 >>> s
'XYZ_FOO   0  The foo property'
 >>> s.split(None, 2)
['XYZ_FOO', '0', 'The foo property']

HTH,
John


From aahz at pythoncraft.com  Tue Mar  2 11:22:38 2010
From: aahz at pythoncraft.com (Aahz)
Date: 2 Mar 2010 08:22:38 -0800
Subject: taking python enterprise level?...
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>
	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>
	<mailman.99.1267513003.23598.python-list@python.org>
Message-ID: <hmje0e$13s$1@panix5.panix.com>

In article <mailman.99.1267513003.23598.python-list at python.org>,
D'Arcy J.M. Cain <darcy at druid.net> wrote:
>
>Put as much memory as you can afford/fit into your database server.
>It's the cheapest performance boost you can get.  If you have a serious
>application put at least 4GB into your dedicated database server.
>Swapping is your enemy.

Also, put your log/journal files on a different spindle from the database
files.  That makes a *huge* difference.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From michaelveloz at gmail.com  Tue Mar  2 11:29:04 2010
From: michaelveloz at gmail.com (Veloz)
Date: Tue, 2 Mar 2010 08:29:04 -0800 (PST)
Subject: Queue peek?
Message-ID: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>

Hi all
I'm looking for a queue that I can use with multiprocessing, which has
a peek method.

I've seen some discussion about queue.peek but don't see anything in
the docs about it.

Does python have a queue class with peek semantics?

Michael


From a_jtim at bellsouth.net  Tue Mar  2 11:31:16 2010
From: a_jtim at bellsouth.net (Tim Arnold)
Date: Tue, 2 Mar 2010 08:31:16 -0800 (PST)
Subject: freebsd and multiprocessing
Message-ID: <7cabdddf-d936-48c7-9b76-97c37def5f8f@z35g2000yqd.googlegroups.com>

Hi,
I'm intending to use multiprocessing on a freebsd machine (6.3
release, quad core, 8cpus, amd64). I see in the doc that on this
platform I can't use synchronize:

ImportError: This platform lacks a functioning sem_open
implementation, therefore, the required synchronization primitives
needed will not function, see issue 3770.

As far as I can tell, I have no need to synchronize the processes--I
have several processes run separately and I need to know when they're
all finished; there's no communication between them and each owns its
own log file for output.

Is anyone using multiprocessing on FreeBSD and run into any other
gotchas?
thanks,
--Tim Arnold


From robert.kern at gmail.com  Tue Mar  2 11:34:51 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 02 Mar 2010 10:34:51 -0600
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <hmi5ns$57b$1@dough.gmane.org>
References: <mailman.34.1267409372.23598.python-list@python.org>	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
	<hmi5ns$57b$1@dough.gmane.org>
Message-ID: <hmjena$n1p$1@dough.gmane.org>

On 2010-03-01 22:55 PM, Terry Reedy wrote:
> On 3/1/2010 7:56 PM, Patrick Maupin wrote:
>> On Mar 1, 5:57 pm, Erik Max Francis<m... at alcyone.com> wrote:
>>> Patrick Maupin wrote:
>>> This not only seriously stretching the meaning of the term "superset"
>>> (as Python is most definitely not even remotely a superset of JSON), but
>>
>> Well, you are entitled to that opinion, but seriously, if I take valid
>> JSON, replace unquoted true with True, unquoted false with False,
>> replace unquoted null with None, and take the quoted strings and
>> replace occurrences of \uXXXX with the appropriate unicode, then I do,
>> in fact, have valid Python. But don't take my word for it -- try it
>> out!
>
> To me this is so strained that I do not see why why you are arguing the
> point. So what? The resulting Python 'program' will be equivalent, I
> believe, to 'pass'. Ie, construct objects and then discard them with no
> computation or output.

Not if you eval() rather than exec(). It's reasonably well-accepted that JSON is 
very close to being a subset of Python's expression syntax with just a few 
modifications.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From robert.kern at gmail.com  Tue Mar  2 11:37:55 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 02 Mar 2010 10:37:55 -0600
Subject: Is this secure?
In-Reply-To: <hmd5v7$bir$1@panix5.panix.com>
References: <mailman.110.1266935711.4577.python-list@python.org>	<7xk4u26qz0.fsf@ruckus.brouhaha.com>
	<hm63gh$ogl$1@dough.gmane.org>	<mailman.247.1267115557.4577.python-list@python.org>
	<hmd5v7$bir$1@panix5.panix.com>
Message-ID: <hmjet2$on5$1@dough.gmane.org>

On 2010-02-28 01:28 AM, Aahz wrote:
> In article<mailman.247.1267115557.4577.python-list at python.org>,
> Robert Kern<robert.kern at gmail.com>  wrote:
>>
>> If you are storing the password instead of making your user remember
>> it, most platforms have some kind of keychain secure password
>> storage. I recommend reading up on the APIs available on your targeted
>> platforms.
>
> Are you sure?  I haven't done a lot of research, but my impression was
> that Windows didn't have anything built in.

You're right, not built-in, but Windows does provide enough crypto services for 
a cross-platform Python implementation to be built:

   http://pypi.python.org/pypi/keyring

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From pavlovevidence at gmail.com  Tue Mar  2 11:49:26 2010
From: pavlovevidence at gmail.com (Carl Banks)
Date: Tue, 2 Mar 2010 08:49:26 -0800 (PST)
Subject: Adding to a module's __dict__?
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>
	<mailman.96.1267508316.23598.python-list@python.org>
	<roy-3CB7A4.08210202032010@news.panix.com>
Message-ID: <8fa1b0d6-3f1b-4499-872c-e5854d289e9e@w27g2000pre.googlegroups.com>

On Mar 2, 5:21?am, Roy Smith <r... at panix.com> wrote:
> In article <mailman.96.1267508316.23598.python-l... at python.org>,
> ?Chris Rebert <c... at rebertia.com> wrote:
>
>
>
> > On Mon, Mar 1, 2010 at 8:27 PM, Roy Smith <r... at panix.com> wrote:
> > > >From inside a module, I want to add a key-value pair to the module's
> > > __dict__. ?I know I can just do:
>
> > > FOO = 'bar'
>
> > > at the module top-level, but I've got 'FOO' as a string and what I
> > > really need to do is
>
> > > __dict__['Foo'] = 'bar'
>
> > > When I do that, I get "NameError: name '__dict__' is not defined". ?Is
> > > it possible to do what I'm trying to do?
>
> > Yes; just modify the dict returned by the globals() built-in function
> > instead.
>
> Ah, cool. ?Thanks.
>
> > It's usually not wise to do this and is better to use a
> > separate dict instead, but I'll assume you know what you're doing and
> > have good reasons to disregard the standard advice due to your
> > use-case.
>
> Why is it unwise?


He didn't say it was unwise.  He said it's usually not wise.


Carl Banks


From philip at semanchuk.com  Tue Mar  2 11:52:13 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 2 Mar 2010 11:52:13 -0500
Subject: freebsd and multiprocessing
In-Reply-To: <7cabdddf-d936-48c7-9b76-97c37def5f8f@z35g2000yqd.googlegroups.com>
References: <7cabdddf-d936-48c7-9b76-97c37def5f8f@z35g2000yqd.googlegroups.com>
Message-ID: <21D34712-C0F0-40E5-9D62-DB867962ED8A@semanchuk.com>


On Mar 2, 2010, at 11:31 AM, Tim Arnold wrote:

> Hi,
> I'm intending to use multiprocessing on a freebsd machine (6.3
> release, quad core, 8cpus, amd64). I see in the doc that on this
> platform I can't use synchronize:
>
> ImportError: This platform lacks a functioning sem_open
> implementation, therefore, the required synchronization primitives
> needed will not function, see issue 3770.
>
> As far as I can tell, I have no need to synchronize the processes--I
> have several processes run separately and I need to know when they're
> all finished; there's no communication between them and each owns its
> own log file for output.
>
> Is anyone using multiprocessing on FreeBSD and run into any other
> gotchas?

Hi Tim,
I don't use multiprocessing but I've written two low-level IPC  
packages, one for SysV IPC and the other for POSIX IPC.

I think that multiprocessing prefers POSIX IPC (which is where  
sem_open() comes from). I don't know what it uses if that's not  
available, but SysV IPC seems a likely alternative. I must emphasize,  
however, that that's a guess on my part.

FreeBSD didn't have POSIX IPC support until 7.0, and that was sort of  
broken until 7.2. As it happens, I was testing my POSIX IPC code  
against 7.2 last night and it works just fine.

SysV IPC works under FreeBSD 6 (and perhaps earlier versions; 6 is the  
oldest I've tested). ISTR that by default each message queue is  
limited to 2048 bytes in total size. 'sysctl kern.ipc' can probably  
tell you that and may even let you change it. Other than that I can't  
think of any SysV limitations that might bite you.

HTH
Philip





From victorsubervi at gmail.com  Tue Mar  2 11:56:58 2010
From: victorsubervi at gmail.com (Victor Subervi)
Date: Tue, 2 Mar 2010 12:56:58 -0400
Subject: Email Script
In-Reply-To: <4dc0cfea1003020753g404e6fbcr29ed52e21e2bb18c@mail.gmail.com>
References: <4dc0cfea1003020748g786aded2i9c5287972aa8984c@mail.gmail.com>
	<4dc0cfea1003020753g404e6fbcr29ed52e21e2bb18c@mail.gmail.com>
Message-ID: <4dc0cfea1003020856x2146652ahaa1537d15c05c347@mail.gmail.com>

On Tue, Mar 2, 2010 at 11:53 AM, Victor Subervi <victorsubervi at gmail.com>wrote:

> On Tue, Mar 2, 2010 at 11:48 AM, Victor Subervi <victorsubervi at gmail.com>wrote:
>
>> Hi;
>> I have the following code:
>>
>> def my_mail():
>>   user, passwd, db, host = login()
>>   database = MySQLdb.connect(host, user, passwd, db)
>>   cursor= database.cursor()
>>   ourEmail1 = 'marilyn at globalsolutionsgroup.vi'
>>   ourEmail1 = 'phil at globalsolutionsgroup.vi'
>>   ourEmail2 = 'benoismyname at gmail.com'
>>   form = cgi.FieldStorage()
>>   name = form.getfirst('name', '')
>>   email = form.getfirst('from', '')
>>   message = form.getfirst('message', '')
>>   message = 'Name: %s\nMessage: %s' % (name, message)
>>   subject = 'Message from Web Site'
>>   Email(
>>       from_address = email,
>>       to_address = ourEmail1,
>>       subject = subject,
>>       message = message
>>   ).send()
>>   Email(
>>       from_address = email,
>>       to_address = ourEmail2,
>>       subject = subject,
>>       message = message
>>   ).send()
>>   print 'Thank you, %s, we will get back to you shortly!<br />' % (name)
>>
>> This sends only the first of the two emails. Why doesn't it work to send
>> the second? What do?
>> TIA,
>> beno
>>
>
> Should I put a timer between instances of Email?
>
>>
>> Adding a timer didn't work. Do I need to explicitly close the smtp
connection before sending the next email? I don't understand why there's a
problem.
TIA,
beno
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From python at mrabarnett.plus.com  Tue Mar  2 12:26:18 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 02 Mar 2010 17:26:18 +0000
Subject: Adding to a module's __dict__?
In-Reply-To: <4B8D3A3A.8030501@optimum.net>
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>	<mailman.96.1267508316.23598.python-list@python.org>	<roy-3CB7A4.08210202032010@news.panix.com>	<mailman.107.1267536800.23598.python-list@python.org>	<f4c188f0-7dba-4629-8a16-eed713b5920f@15g2000yqa.googlegroups.com>
	<4B8D3A3A.8030501@optimum.net>
Message-ID: <4B8D4A3A.90501@mrabarnett.plus.com>

John Posner wrote:
> On 3/2/2010 10:19 AM, Roy Smith wrote:
>>
>> Somewhat sadly, in my case, I can't even machine process the header
>> file.  I don't, strictly speaking, have a header file.  What I have is
>> a PDF which documents what's in the header file, and I'm manually re-
>> typing the data out of that.  Sigh.
> 
> Here's an idea, perhaps too obvious, to minimize your keystrokes:
> 
> 1. Create a text file with the essential data:
> 
> XYZ_FOO   0  The foo property
> XYZ_BAR   1  The bar property
> XYZ_BAZ   2  reserved for future use
> 
> 2. Use a Python script to convert this into the desired code:
> 
> declare('XYZ_FOO', 0, "The foo property")
> declare('XYZ_BAR', 1, "The bar property")
> declare('XYZ_BAZ', 2, "reserved for future use")
> 
> Note:
> 
>  >>> s
> 'XYZ_FOO   0  The foo property'
>  >>> s.split(None, 2)
> ['XYZ_FOO', '0', 'The foo property']
> 
You might be able to reduce your typing by copy-and-pasting the relevant
text from the PDF into an editor and then editing it.


From python at mrabarnett.plus.com  Tue Mar  2 12:32:40 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 02 Mar 2010 17:32:40 +0000
Subject: os.fdopen() issue in Python 3.1?
In-Reply-To: <1267539898.477222.7.camel@necropolis>
References: <1267539898.477222.7.camel@necropolis>
Message-ID: <4B8D4BB8.8020909@mrabarnett.plus.com>

Albert Hopkins wrote:
> I have a snippet of code that looks like this:
> 
>         pid, fd = os.forkpty()
>         if pid == 0:
>             subprocess.call(args)
>         else:
>             input = os.fdopen(fd).read()
>         ...
> 
> 
> This seems to work find for CPython 2.5 and 2.6 on my Linux system.
> However, with CPython 3.1 I get:
> 
>             input = os.fdopen(fd).read()
>         IOError: [Errno 5] Input/output error
> 
> Is there something wrong in Python 3.1?  Is this the correct way to do
> this (run a process in a pseudo-tty and read it's output) or is there
> another way I should/could be doing this?
> 
The documentation also mentions the 'pty' module. Have you tried that
instead?


From emannion at gmail.com  Tue Mar  2 12:33:39 2010
From: emannion at gmail.com (enda man)
Date: Tue, 2 Mar 2010 09:33:39 -0800 (PST)
Subject: Call Signtool using python
References: <24bf5006-db86-4415-89ec-c5eab8f1c740@x22g2000yqx.googlegroups.com>
	<mailman.112.1267541184.23598.python-list@python.org>
Message-ID: <fad4c5e6-ae70-4175-8a64-5fe74669d0b4@f35g2000yqd.googlegroups.com>

On Mar 2, 2:46?pm, "Matt Mitchell" <mmitch... at transparent.com> wrote:
> I think you need to use the /p switch to pass signtool.exe a password
> when using the /f switch.
> Check outhttp://msdn.microsoft.com/en-us/library/8s9b9yaz%28VS.80%29.aspxfor
> more info.
>
> -----------------------------------
> The information contained in this electronic message and any attached document(s) is intended only for the personal and confidential use of the designated recipients named above. This message may be confidential. If the reader of this message is not the intended recipient, you are hereby notified that you have received this document in error, and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify sender immediately by telephone (603) 262-6300 or by electronic mail immediately. Thank you.
>
> -----Original Message-----
> From: python-list-bounces+mmitchell=transparent.... at python.org
>
> [mailto:python-list-bounces+mmitchell=transparent.... at python.org] On
> Behalf Of enda man
> Sent: Tuesday, March 02, 2010 6:34 AM
> To: python-l... at python.org
> Subject: Call Signtool using python
>
> Hi,
>
> I want to call the Windows signtool to sign a binary from a python
> script.
>
> Here is my script:
> //
> os.chdir('./Install/activex/cab')
> subprocess.call(["signtool", "sign", "/v", "/f", "webph.pfx", "/t",
> "http://timestamp.verisign.com/scripts/timstamp.dll", "WebPh.exe" ])
> //
>
> But I am getting this error:
> ////
> SignTool Error: The specified PFX password is not correct.
>
> Number of files successfully Signed: 0
> Number of warnings: 0
> Number of errors: 1
> Finished building plugin installer
> scons: done building targets.
> ////
>
> This python script is called as part of a scons build, which is also
> python code.
>
> Anyone seen this before or can pass on any ideas.
> Tks,
> EM
>
> --http://mail.python.org/mailman/listinfo/python-list
>
>

The same command works when run from the command line but when I run
it from python  using subprocess.call(...) it fails as described in my
first post.  I do not need to use the /p switch as the password is
embedded in the pfx file.
That is why I think it is something I am or am not doing in python.

EM





From usenot at geekmail.INVALID  Tue Mar  2 12:35:27 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Tue, 2 Mar 2010 18:35:27 +0100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
	<mailman.78.1267477780.23598.python-list@python.org>
Message-ID: <20100302183527.47c6e8f5@geekmail.INVALID>

On Mon, 01 Mar 2010 21:09:39 +0000 Mark Lawrence
<breamoreboy at yahoo.co.uk> wrote:

> Andreas Waldenburger wrote:
> > [snip]
> > We did not buy code. If it were written in C or such, we would never
> > get to see it.
> > 
> > It's not our concern.
> > 
> > /W
> > 
> 
>  From your original post.
> 
> <quote>
> a company that works with my company writes a lot of of their code in
> Python (lucky jerks). I've seen their code and it basically looks like
> this:
> </quote>
> 
> So what is the relationship between your company and this other
> company?
They write a piece of software that we run as a component in a software
ecosystem that we (and others) have developed.


> When it gets down to pounds, shillings and pence (gosh, I'm
> old!:) it sure as hell could make a tremendous difference in the long
> term, given that usually maintainance costs are astronomical when
> compared to initial development costs.
> 
I totally agree, but as long as their software works, why should we
care how their code looks? It's totally their responsibility. Why
should we nanny every partner we have?

Don't get me wrong; our whole system is more fragile than I find
comfortable. But I guess getting 10ish different parties around the
globe to work in complete unison is quite a feat, and I'm surprised it
even works as it is. But it does, and I'm glad we don't have to
micromanage other people's code.


/W


-- 
INVALID? DE!



From tjreedy at udel.edu  Tue Mar  2 12:38:55 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 02 Mar 2010 12:38:55 -0500
Subject: Adding to a module's __dict__?
In-Reply-To: <4B8D3A3A.8030501@optimum.net>
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>	<mailman.96.1267508316.23598.python-list@python.org>	<roy-3CB7A4.08210202032010@news.panix.com>	<mailman.107.1267536800.23598.python-list@python.org>	<f4c188f0-7dba-4629-8a16-eed713b5920f@15g2000yqa.googlegroups.com>
	<4B8D3A3A.8030501@optimum.net>
Message-ID: <hmjifd$ju3$1@dough.gmane.org>

On 3/2/2010 11:18 AM, John Posner wrote:
> On 3/2/2010 10:19 AM, Roy Smith wrote:
>>
>> Somewhat sadly, in my case, I can't even machine process the header
>> file. I don't, strictly speaking, have a header file. What I have is
>> a PDF which documents what's in the header file, and I'm manually re-
>> typing the data out of that. Sigh.

There are Python modules to read/write pdf.

> Here's an idea, perhaps too obvious, to minimize your keystrokes:
>
> 1. Create a text file with the essential data:
>
> XYZ_FOO 0 The foo property
> XYZ_BAR 1 The bar property
> XYZ_BAZ 2 reserved for future use
>
> 2. Use a Python script to convert this into the desired code:
>
> declare('XYZ_FOO', 0, "The foo property")
> declare('XYZ_BAR', 1, "The bar property")
> declare('XYZ_BAZ', 2, "reserved for future use")
>
> Note:
>
>  >>> s
> 'XYZ_FOO 0 The foo property'
>  >>> s.split(None, 2)
> ['XYZ_FOO', '0', 'The foo property']

Given that set of triples is constant, I would think about having the 
Python script do the computation just once, instead of with every 
inport. In other words, the script should *call* the declare function 
and then write out the resulting set of dicts either to a .py or pickle 
file.

tjr




From usenot at geekmail.INVALID  Tue Mar  2 12:40:56 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Tue, 2 Mar 2010 18:40:56 +0100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
	<87eik3zmi8.fsf@benfinney.id.au>
Message-ID: <20100302184056.743a71e7@geekmail.INVALID>

On Tue, 02 Mar 2010 09:48:47 +1100 Ben Finney
<ben+python at benfinney.id.au> wrote:

> > It's not our concern.  
> 
> Then I don't see what that problem is.

There is none. I was griping about how stupid they are. That is a
personal problem I have with their *code* (not software), and I thought
I'd just share my superiority complex with everyone.

I had hoped that everyone just read it, went like "Oh geez.", smiled it
off with a hint of lesson learned and got back to whatever it was they
were doing. Alas, I was wrong ... and I'm sorry.

/W

-- 
INVALID? DE!



From affdfsdfdsfsd at b.com  Tue Mar  2 12:46:12 2010
From: affdfsdfdsfsd at b.com (Tracubik)
Date: 02 Mar 2010 17:46:12 GMT
Subject: case do problem
Message-ID: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>

hi, i've to convert from Pascal this code:

iterations=0;
count=0;
REPEAT;
  iterations = iterations+1;
  ...
  IF (genericCondition) THEN count=count+1;
  ...
  CASE count OF:
	1: m = 1
        2: m = 10
        3: m = 100
UNTIL count = 4 OR iterations = 20

i do something like this:

iterations = 0
count = 0

m_Switch = (1,10,100)

while True:
	iterations +=1
	...
	if (genericCondition):
		count +=1
	...
	try:
		m = m_Switch[count-1]
	except: pass
	if count = 4 or iterations = 20

the problem is that when count = 4 m_Switch[4-1] have no value, so i use 
the try..except.

Is there a better solution to solve this problem? and, generally 
speaking, the try..except block slow down the execution of the program or 
not?

Thank you in advance
Nico
	


From mrkafk at gmail.com  Tue Mar  2 12:46:22 2010
From: mrkafk at gmail.com (mk)
Date: Tue, 02 Mar 2010 18:46:22 +0100
Subject: conditional import into global namespace
Message-ID: <hmjita$ms4$1@dough.gmane.org>

Hello everyone,

I have a class that is dependent on subprocess functionality. I would 
like to make it self-contained in the sense that it would import 
subprocess if it's not imported yet.

What is the best way to proceed with this?

I see a few possibilities:

1. do a class level import, like:

class TimeSync(object):

     import subprocess


2. do an import in init, which is worse bc it's ran every time an 
instance is created:

     def __init__(self, shiftsec, ntpserver):
         import subprocess


Both of those methods have disadvantage in this context, though: they 
create 'subprocess' namespace in a class or instance, respectively.

Is there anyway to make it a global import?

Regards,
mk



From invalid at invalid.invalid  Tue Mar  2 12:46:52 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Tue, 2 Mar 2010 17:46:52 +0000 (UTC)
Subject: Broken references in postings
Message-ID: <hmjiuc$7pk$1@reader1.panix.com>

I've noticed recently that a lot of the "refernces" and
"in-reply-to" headers in c.l.p are broken, resulting in the
inability to move from a child to a parent in a tree.

For example in a recent reply (subejct: os.fdopen() issue in
Python 3.1?), the references and in-reply-to headers both
contained:

  1267539898.477222.7.camel at necropolis

However, the article replied to has a message-ID header of 

  mailman.110.1267539885.23598.python-list at python.org

I don't see 1267539898.477222.7.camel at necropolis anywhere in
the headers of the referrant.

Is something broken in the mail<->news gateway?

Or is it just individual news/mail clients that are broken?

-- 
Grant Edwards               grant.b.edwards        Yow! I own seven-eighths of
                                  at               all the artists in downtown
                              gmail.com            Burbank!


From affdfsdfdsfsd at b.com  Tue Mar  2 12:50:45 2010
From: affdfsdfdsfsd at b.com (Tracubik)
Date: 02 Mar 2010 17:50:45 GMT
Subject: case do problem
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
Message-ID: <4b8d4ff5$0$1132$4fafbaef@reader1.news.tin.it>

additional information:

when count=4 i haven't to change the m value, so i have to do nothing or 
something like m = m

Nico


From tjreedy at udel.edu  Tue Mar  2 12:59:00 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 02 Mar 2010 12:59:00 -0500
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <hmjena$n1p$1@dough.gmane.org>
References: <mailman.34.1267409372.23598.python-list@python.org>	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>	<hmi5ns$57b$1@dough.gmane.org>
	<hmjena$n1p$1@dough.gmane.org>
Message-ID: <hmjjl2$r4m$1@dough.gmane.org>

On 3/2/2010 11:34 AM, Robert Kern wrote:
> On 2010-03-01 22:55 PM, Terry Reedy wrote:
>> On 3/1/2010 7:56 PM, Patrick Maupin wrote:
>>> On Mar 1, 5:57 pm, Erik Max Francis<m... at alcyone.com> wrote:
>>>> Patrick Maupin wrote:
>>>> This not only seriously stretching the meaning of the term "superset"
>>>> (as Python is most definitely not even remotely a superset of JSON),
>>>> but
>>>
>>> Well, you are entitled to that opinion, but seriously, if I take valid
>>> JSON, replace unquoted true with True, unquoted false with False,
>>> replace unquoted null with None, and take the quoted strings and
>>> replace occurrences of \uXXXX with the appropriate unicode, then I do,
>>> in fact, have valid Python. But don't take my word for it -- try it
>>> out!
>>
>> To me this is so strained that I do not see why why you are arguing the
>> point. So what? The resulting Python 'program' will be equivalent, I
>> believe, to 'pass'. Ie, construct objects and then discard them with no
>> computation or output.
>
> Not if you eval() rather than exec().

 >>> eval(1)

creates and objects and discards it, with a net result of 'pass'.
What do you think I am missing.

It's reasonably well-accepted that
> JSON is very close to being a subset of Python's expression syntax with
> just a few modifications.

It is specifically JavaScript Object Notation, which is very similar to 
a subset of Python's object notation (number and string literals and 
list and dict displays (but not set displays), and three named 
constants). Without operators, it barely qualifies, to me, even as 
'expression syntax'.

To me, comparing object notation with programming language is not 
helpful to the OP's purpose. His main claim is that JSON can be usefully 
extended but that YAML is too much, so that perhaps he, with help, can 
find a 'sweet spot' in between.

Terry Jan Reedy






From a_jtim at bellsouth.net  Tue Mar  2 12:59:10 2010
From: a_jtim at bellsouth.net (Tim Arnold)
Date: Tue, 2 Mar 2010 09:59:10 -0800 (PST)
Subject: freebsd and multiprocessing
References: <7cabdddf-d936-48c7-9b76-97c37def5f8f@z35g2000yqd.googlegroups.com>
	<mailman.121.1267548737.23598.python-list@python.org>
Message-ID: <5c8d7d72-710a-41c1-897e-8d5605c61373@e7g2000yqf.googlegroups.com>

On Mar 2, 11:52?am, Philip Semanchuk <phi... at semanchuk.com> wrote:
> On Mar 2, 2010, at 11:31 AM, Tim Arnold wrote:
>
>
>
>
>
> > Hi,
> > I'm intending to use multiprocessing on a freebsd machine (6.3
> > release, quad core, 8cpus, amd64). I see in the doc that on this
> > platform I can't use synchronize:
>
> > ImportError: This platform lacks a functioning sem_open
> > implementation, therefore, the required synchronization primitives
> > needed will not function, see issue 3770.
>
> > As far as I can tell, I have no need to synchronize the processes--I
> > have several processes run separately and I need to know when they're
> > all finished; there's no communication between them and each owns its
> > own log file for output.
>
> > Is anyone using multiprocessing on FreeBSD and run into any other
> > gotchas?
>
> Hi Tim,
> I don't use multiprocessing but I've written two low-level IPC ?
> packages, one for SysV IPC and the other for POSIX IPC.
>
> I think that multiprocessing prefers POSIX IPC (which is where ?
> sem_open() comes from). I don't know what it uses if that's not ?
> available, but SysV IPC seems a likely alternative. I must emphasize, ?
> however, that that's a guess on my part.
>
> FreeBSD didn't have POSIX IPC support until 7.0, and that was sort of ?
> broken until 7.2. As it happens, I was testing my POSIX IPC code ?
> against 7.2 last night and it works just fine.
>
> SysV IPC works under FreeBSD 6 (and perhaps earlier versions; 6 is the ?
> oldest I've tested). ISTR that by default each message queue is ?
> limited to 2048 bytes in total size. 'sysctl kern.ipc' can probably ?
> tell you that and may even let you change it. Other than that I can't ?
> think of any SysV limitations that might bite you.
>
> HTH
> Philip

Hi Philip,
Thanks for that information. I wish I could upgrade the machine to
7.2! alas, out of my power.  I get the following results from sysctl:
% sysctl kern.ipc | grep msg
kern.ipc.msgseg: 2048
kern.ipc.msgssz: 8
kern.ipc.msgtql: 40
kern.ipc.msgmnb: 2048
kern.ipc.msgmni: 40
kern.ipc.msgmax: 16384

I'll write some test programs using multiprocessing and see how they
go before committing to rewrite my current code. I've also been
looking at 'parallel python' although it may have the same issues.
http://www.parallelpython.com/

thanks again,
--Tim


From clp2 at rebertia.com  Tue Mar  2 12:59:22 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 2 Mar 2010 09:59:22 -0800
Subject: Call Signtool using python
In-Reply-To: <24bf5006-db86-4415-89ec-c5eab8f1c740@x22g2000yqx.googlegroups.com>
References: <24bf5006-db86-4415-89ec-c5eab8f1c740@x22g2000yqx.googlegroups.com>
Message-ID: <50697b2c1003020959g33d31d45ge1a7b7986b7e5a45@mail.gmail.com>

On Tue, Mar 2, 2010 at 3:34 AM, enda man <emannion at gmail.com> wrote:
> Hi,
>
> I want to call the Windows signtool to sign a binary from a python
> script.
>
> Here is my script:
> //
> os.chdir('./Install/activex/cab')
> subprocess.call(["signtool", "sign", "/v", "/f", "webph.pfx", "/t",
> "http://timestamp.verisign.com/scripts/timstamp.dll", "WebPh.exe" ])
> //
>
> But I am getting this error:
> ////
> SignTool Error: The specified PFX password is not correct.
>
> Number of files successfully Signed: 0
> Number of warnings: 0
> Number of errors: 1
> Finished building plugin installer
> scons: done building targets.
> ////
>
>
> This python script is called as part of a scons build, which is also
> python code.
>
> Anyone seen this before or can pass on any ideas.

Nothing looks obviously wrong (though I'm unfamiliar with signtool).
Have you tried specifying an absolute path to webph.pfx?

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


From alfps at start.no  Tue Mar  2 13:00:09 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Tue, 02 Mar 2010 19:00:09 +0100
Subject: case do problem
In-Reply-To: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
Message-ID: <hmjjnn$arj$1@news.eternal-september.org>

* Tracubik:
> hi, i've to convert from Pascal this code:
> 
> iterations=0;
> count=0;
> REPEAT;
>   iterations = iterations+1;
>   ...
>   IF (genericCondition) THEN count=count+1;
>   ...
>   CASE count OF:
> 	1: m = 1
>         2: m = 10
>         3: m = 100

Uhm, is this syntactically valid Pascal? As I recall, every Pascal construct was 
delimited in some way. Once I had the complete Pascal syntax in my head, but 
alas, not anymore...


> UNTIL count = 4 OR iterations = 20
> 
> i do something like this:
> 
> iterations = 0
> count = 0
> 
> m_Switch = (1,10,100)
> 
> while True:
> 	iterations +=1
> 	...
> 	if (genericCondition):
> 		count +=1
> 	...
> 	try:
> 		m = m_Switch[count-1]
> 	except: pass
> 	if count = 4 or iterations = 20
> 
> the problem is that when count = 4 m_Switch[4-1] have no value, so i use 
> the try..except.

   iterations = 0
   count = 0
   while not( count == 4 or iterations == 20 ):
       iterations += 1
       # ...
       if generic_condition:
           count += 1
       # ...
       m = (1, 10, 100, 100)[count]


> Is there a better solution to solve this problem?

Define "better". Do you mean faster, more clear, shorter, using less memory, what?

Above I've assumed that you want to get rid of the try block, since that's what 
you're asking about:


> and, generally 
> speaking, the try..except block slow down the execution of the program or 
> not?

Probably, but don't think about it. Python programming is at a level where that 
kind of efficiency doesn't count. Or, ideally it shouldn't count.


Cheers & hth.,

- Alf


From alfps at start.no  Tue Mar  2 13:01:36 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Tue, 02 Mar 2010 19:01:36 +0100
Subject: case do problem
In-Reply-To: <hmjjnn$arj$1@news.eternal-september.org>
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
	<hmjjnn$arj$1@news.eternal-september.org>
Message-ID: <hmjjq1$arj$2@news.eternal-september.org>

* Alf P. Steinbach:
> * Tracubik:
>> hi, i've to convert from Pascal this code:
>>
>> iterations=0;
>> count=0;
>> REPEAT;
>>   iterations = iterations+1;
>>   ...
>>   IF (genericCondition) THEN count=count+1;
>>   ...
>>   CASE count OF:
>>     1: m = 1
>>         2: m = 10
>>         3: m = 100
> 
> Uhm, is this syntactically valid Pascal? As I recall, every Pascal 
> construct was delimited in some way. Once I had the complete Pascal 
> syntax in my head, but alas, not anymore...
> 
> 
>> UNTIL count = 4 OR iterations = 20
>>
>> i do something like this:
>>
>> iterations = 0
>> count = 0
>>
>> m_Switch = (1,10,100)
>>
>> while True:
>>     iterations +=1
>>     ...
>>     if (genericCondition):
>>         count +=1
>>     ...
>>     try:
>>         m = m_Switch[count-1]
>>     except: pass
>>     if count = 4 or iterations = 20
>>
>> the problem is that when count = 4 m_Switch[4-1] have no value, so i 
>> use the try..except.
> 
>   iterations = 0
>   count = 0
>   while not( count == 4 or iterations == 20 ):
>       iterations += 1
>       # ...
>       if generic_condition:
>           count += 1
>       # ...
>       m = (1, 10, 100, 100)[count]

Add one extra 100 there.


>> Is there a better solution to solve this problem?
> 
> Define "better". Do you mean faster, more clear, shorter, using less 
> memory, what?
> 
> Above I've assumed that you want to get rid of the try block, since 
> that's what you're asking about:
> 
> 
>> and, generally speaking, the try..except block slow down the execution 
>> of the program or not?
> 
> Probably, but don't think about it. Python programming is at a level 
> where that kind of efficiency doesn't count. Or, ideally it shouldn't 
> count.
> 
> 
> Cheers & hth.,
> 
> - Alf


From alfps at start.no  Tue Mar  2 13:04:21 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Tue, 02 Mar 2010 19:04:21 +0100
Subject: case do problem
In-Reply-To: <hmjjq1$arj$2@news.eternal-september.org>
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
	<hmjjnn$arj$1@news.eternal-september.org>
	<hmjjq1$arj$2@news.eternal-september.org>
Message-ID: <hmjjv6$arj$3@news.eternal-september.org>

* Alf P. Steinbach:
> * Alf P. Steinbach:
>> * Tracubik:
>>> hi, i've to convert from Pascal this code:
>>>
>>> iterations=0;
>>> count=0;
>>> REPEAT;
>>>   iterations = iterations+1;
>>>   ...
>>>   IF (genericCondition) THEN count=count+1;
>>>   ...
>>>   CASE count OF:
>>>     1: m = 1
>>>         2: m = 10
>>>         3: m = 100
>>
>> Uhm, is this syntactically valid Pascal? As I recall, every Pascal 
>> construct was delimited in some way. Once I had the complete Pascal 
>> syntax in my head, but alas, not anymore...
>>
>>
>>> UNTIL count = 4 OR iterations = 20
>>>
>>> i do something like this:
>>>
>>> iterations = 0
>>> count = 0
>>>
>>> m_Switch = (1,10,100)
>>>
>>> while True:
>>>     iterations +=1
>>>     ...
>>>     if (genericCondition):
>>>         count +=1
>>>     ...
>>>     try:
>>>         m = m_Switch[count-1]
>>>     except: pass
>>>     if count = 4 or iterations = 20
>>>
>>> the problem is that when count = 4 m_Switch[4-1] have no value, so i 
>>> use the try..except.
>>
>>   iterations = 0
>>   count = 0
>>   while not( count == 4 or iterations == 20 ):
>>       iterations += 1
>>       # ...
>>       if generic_condition:
>>           count += 1
>>       # ...
>>       m = (1, 10, 100, 100)[count]
> 
> Add one extra 100 there.

Oh dear, it's one of those days.

    if 1 <= count <= 3:
        m = (1, 10, 100)[count - 1]


>>> Is there a better solution to solve this problem?
>>
>> Define "better". Do you mean faster, more clear, shorter, using less 
>> memory, what?
>>
>> Above I've assumed that you want to get rid of the try block, since 
>> that's what you're asking about:
>>
>>
>>> and, generally speaking, the try..except block slow down the 
>>> execution of the program or not?
>>
>> Probably, but don't think about it. Python programming is at a level 
>> where that kind of efficiency doesn't count. Or, ideally it shouldn't 
>> count.
>>
>>
>> Cheers & hth.,
>>
>> - Alf


From jeanmichel at sequans.com  Tue Mar  2 13:05:25 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Tue, 02 Mar 2010 19:05:25 +0100
Subject: Docstrings considered too complicated
In-Reply-To: <20100302184056.743a71e7@geekmail.INVALID>
References: <20100224212303.242222c6@geekmail.INVALID>	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>	<20100227191040.6c77f2d8@geekmail.INVALID>	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>	<20100301140943.4edca16b@geekmail.INVALID>	<4b8be8f7$1@dnews.tpgi.com.au>	<20100301182255.3de59bc6@geekmail.INVALID>	<mailman.66.1267465347.23598.python-list@python.org>	<20100301212954.7aa0b99d@geekmail.INVALID>	<87eik3zmi8.fsf@benfinney.id.au>
	<20100302184056.743a71e7@geekmail.INVALID>
Message-ID: <4B8D5365.9060502@sequans.com>

Andreas Waldenburger wrote:
> On Tue, 02 Mar 2010 09:48:47 +1100 Ben Finney
> <ben+python at benfinney.id.au> wrote:
>
>   
>>> It's not our concern.  
>>>       
>> Then I don't see what that problem is.
>>     
>
> There is none. I was griping about how stupid they are. That is a
> personal problem I have with their *code* (not software), and I thought
> I'd just share my superiority complex with everyone.
>
> I had hoped that everyone just read it, went like "Oh geez.", smiled it
> off with a hint of lesson learned and got back to whatever it was they
> were doing. Alas, I was wrong ... and I'm sorry.
>
> /W
>
>   
There's something wrong saying that stupid people write working code 
that totally satisfies your needs. Don't you agree ? ;-)

JM


From python at rcn.com  Tue Mar  2 13:18:54 2010
From: python at rcn.com (Raymond Hettinger)
Date: Tue, 2 Mar 2010 10:18:54 -0800 (PST)
Subject: Queue peek?
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>
Message-ID: <b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>

On Mar 2, 8:29?am, Veloz <michaelve... at gmail.com> wrote:
> Hi all
> I'm looking for a queue that I can use with multiprocessing, which has
> a peek method.
>
> I've seen some discussion about queue.peek but don't see anything in
> the docs about it.
>
> Does python have a queue class with peek semantics?

Am curious about your use case?  Why peek at something
that could be gone by the time you want to use it.

  val = q.peek()
  if something_i_want(val):
       v2 = q.get()         # this could be different than val

Wouldn't it be better to just get() the value and return if you don't
need it?

  val = q.peek()
  if not something_i_want(val):
      q.put(val)


Raymond





From python at mrabarnett.plus.com  Tue Mar  2 13:21:02 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 02 Mar 2010 18:21:02 +0000
Subject: conditional import into global namespace
In-Reply-To: <hmjita$ms4$1@dough.gmane.org>
References: <hmjita$ms4$1@dough.gmane.org>
Message-ID: <4B8D570E.5070804@mrabarnett.plus.com>

mk wrote:
> Hello everyone,
> 
> I have a class that is dependent on subprocess functionality. I would 
> like to make it self-contained in the sense that it would import 
> subprocess if it's not imported yet.
> 
> What is the best way to proceed with this?
> 
> I see a few possibilities:
> 
> 1. do a class level import, like:
> 
> class TimeSync(object):
> 
>     import subprocess
> 
> 
> 2. do an import in init, which is worse bc it's ran every time an 
> instance is created:
> 
>     def __init__(self, shiftsec, ntpserver):
>         import subprocess
> 
> 
> Both of those methods have disadvantage in this context, though: they 
> create 'subprocess' namespace in a class or instance, respectively.
> 
> Is there anyway to make it a global import?
> 
The simplest solution is just import it at the top of the module.


From tjreedy at udel.edu  Tue Mar  2 13:25:16 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 02 Mar 2010 13:25:16 -0500
Subject: os.fdopen() issue in Python 3.1?
In-Reply-To: <1267539898.477222.7.camel@necropolis>
References: <1267539898.477222.7.camel@necropolis>
Message-ID: <hmjl6a$230$1@dough.gmane.org>

On 3/2/2010 9:24 AM, Albert Hopkins wrote:
> I have a snippet of code that looks like this:
>
>          pid, fd = os.forkpty()
>          if pid == 0:
>              subprocess.call(args)
>          else:
>              input = os.fdopen(fd).read()
>          ...
>
>
> This seems to work find for CPython 2.5 and 2.6 on my Linux system.

To get help, or report a bug, for something like this, be as specific as 
possible. 'Linux' may be too generic.

> However, with CPython 3.1 I get:
>
>              input = os.fdopen(fd).read()
>          IOError: [Errno 5] Input/output error
>
> Is there something wrong in Python 3.1?  Is this the correct way to do
> this (run a process in a pseudo-tty and read it's output) or is there
> another way I should/could be doing this?

No idea, however, the first thing I would do is call the .fdopen and 
.read methods separately (on separate lines) to isolate which is raising 
the error.

tjr





From python at mrabarnett.plus.com  Tue Mar  2 13:26:08 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 02 Mar 2010 18:26:08 +0000
Subject: case do problem
In-Reply-To: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
Message-ID: <4B8D5840.4070601@mrabarnett.plus.com>

Tracubik wrote:
> hi, i've to convert from Pascal this code:
> 
> iterations=0;
> count=0;
> REPEAT;
>   iterations = iterations+1;
>   ...
>   IF (genericCondition) THEN count=count+1;
>   ...
>   CASE count OF:
> 	1: m = 1
>         2: m = 10
>         3: m = 100
> UNTIL count = 4 OR iterations = 20
> 
> i do something like this:
> 
> iterations = 0
> count = 0
> 
> m_Switch = (1,10,100)
> 
> while True:
> 	iterations +=1
> 	...
> 	if (genericCondition):
> 		count +=1
> 	...
> 	try:
> 		m = m_Switch[count-1]
> 	except: pass
> 	if count = 4 or iterations = 20
> 
> the problem is that when count = 4 m_Switch[4-1] have no value, so i use 
> the try..except.
> 
> Is there a better solution to solve this problem? and, generally 
> speaking, the try..except block slow down the execution of the program or 
> not?
> 
Use a dict:

     m_Switch = {1: 1, 2: 10, 3: 100}

and then catch the KeyError.

Don't use a bare 'except', catch the specific exception you want to
catch, and don't worry about the speed unless you discover that it's
real problem.


From malaclypse2 at gmail.com  Tue Mar  2 13:31:13 2010
From: malaclypse2 at gmail.com (Jerry Hill)
Date: Tue, 2 Mar 2010 13:31:13 -0500
Subject: conditional import into global namespace
In-Reply-To: <hmjita$ms4$1@dough.gmane.org>
References: <hmjita$ms4$1@dough.gmane.org>
Message-ID: <16651e81003021031h3831d4b3i844f331f3d301042@mail.gmail.com>

On Tue, Mar 2, 2010 at 12:46 PM, mk <mrkafk at gmail.com> wrote:
> Hello everyone,
>
> I have a class that is dependent on subprocess functionality. I would like
> to make it self-contained in the sense that it would import subprocess if
> it's not imported yet.
>
> What is the best way to proceed with this?

Just import subprocess at the top of your module.  If subprocess
hasn't been imported yet, it will be imported when your module is
loaded.  If it's already been imported, your module will use the
cached version that's already been imported.

In other words, it sounds like Python already does what you want.  You
don't need to do anything special.

-- 
Jerry


From a_jtim at bellsouth.net  Tue Mar  2 13:31:50 2010
From: a_jtim at bellsouth.net (Tim Arnold)
Date: Tue, 2 Mar 2010 10:31:50 -0800 (PST)
Subject: freebsd and multiprocessing
References: <7cabdddf-d936-48c7-9b76-97c37def5f8f@z35g2000yqd.googlegroups.com>
	<mailman.121.1267548737.23598.python-list@python.org>
	<5c8d7d72-710a-41c1-897e-8d5605c61373@e7g2000yqf.googlegroups.com>
Message-ID: <4079148c-3690-4c24-b3db-79f685bf8eab@q15g2000yqj.googlegroups.com>

On Mar 2, 12:59?pm, Tim Arnold <a_j... at bellsouth.net> wrote:
> On Mar 2, 11:52?am, Philip Semanchuk <phi... at semanchuk.com> wrote:
> > On Mar 2, 2010, at 11:31 AM, Tim Arnold wrote:
>
> > > Hi,
> > > I'm intending to use multiprocessing on a freebsd machine (6.3
> > > release, quad core, 8cpus, amd64). I see in the doc that on this
> > > platform I can't use synchronize:
>
> > > ImportError: This platform lacks a functioning sem_open
> > > implementation, therefore, the required synchronization primitives
> > > needed will not function, see issue 3770.
>
> > > As far as I can tell, I have no need to synchronize the processes--I
> > > have several processes run separately and I need to know when they're
> > > all finished; there's no communication between them and each owns its
> > > own log file for output.
>
> > > Is anyone using multiprocessing on FreeBSD and run into any other
> > > gotchas?
>
> > Hi Tim,
> > I don't use multiprocessing but I've written two low-level IPC ?
> > packages, one for SysV IPC and the other for POSIX IPC.
>
> > I think that multiprocessing prefers POSIX IPC (which is where ?
> > sem_open() comes from). I don't know what it uses if that's not ?
> > available, but SysV IPC seems a likely alternative. I must emphasize, ?
> > however, that that's a guess on my part.
>
> > FreeBSD didn't have POSIX IPC support until 7.0, and that was sort of ?
> > broken until 7.2. As it happens, I was testing my POSIX IPC code ?
> > against 7.2 last night and it works just fine.
>
> > SysV IPC works under FreeBSD 6 (and perhaps earlier versions; 6 is the ?
> > oldest I've tested). ISTR that by default each message queue is ?
> > limited to 2048 bytes in total size. 'sysctl kern.ipc' can probably ?
> > tell you that and may even let you change it. Other than that I can't ?
> > think of any SysV limitations that might bite you.
>
> > HTH
> > Philip
>
> Hi Philip,
> Thanks for that information. I wish I could upgrade the machine to
> 7.2! alas, out of my power. ?I get the following results from sysctl:
> % sysctl kern.ipc | grep msg
> kern.ipc.msgseg: 2048
> kern.ipc.msgssz: 8
> kern.ipc.msgtql: 40
> kern.ipc.msgmnb: 2048
> kern.ipc.msgmni: 40
> kern.ipc.msgmax: 16384
>
> I'll write some test programs using multiprocessing and see how they
> go before committing to rewrite my current code. I've also been
> looking at 'parallel python' although it may have the same issues.http://www.parallelpython.com/
>
> thanks again,
> --Tim

Well that didn't work out well. I can't import either Queue or Pool
from multiprocessing, so I'm back to the drawing board. I'll see now
how parallel python does on freebsd.

--Tim



From mrkafk at gmail.com  Tue Mar  2 13:33:31 2010
From: mrkafk at gmail.com (mk)
Date: Tue, 02 Mar 2010 19:33:31 +0100
Subject: Email Script
In-Reply-To: <4dc0cfea1003020856x2146652ahaa1537d15c05c347@mail.gmail.com>
References: <4dc0cfea1003020748g786aded2i9c5287972aa8984c@mail.gmail.com>	<4dc0cfea1003020753g404e6fbcr29ed52e21e2bb18c@mail.gmail.com>
	<4dc0cfea1003020856x2146652ahaa1537d15c05c347@mail.gmail.com>
Message-ID: <hmjlln$373$1@dough.gmane.org>


Where do you take class Email from? There's no info in your mail on this.

Regards,
mk



From victorsubervi at gmail.com  Tue Mar  2 13:37:43 2010
From: victorsubervi at gmail.com (Victor Subervi)
Date: Tue, 2 Mar 2010 14:37:43 -0400
Subject: Email Script
In-Reply-To: <4dc0cfea1003020856x2146652ahaa1537d15c05c347@mail.gmail.com>
References: <4dc0cfea1003020748g786aded2i9c5287972aa8984c@mail.gmail.com>
	<4dc0cfea1003020753g404e6fbcr29ed52e21e2bb18c@mail.gmail.com>
	<4dc0cfea1003020856x2146652ahaa1537d15c05c347@mail.gmail.com>
Message-ID: <4dc0cfea1003021037wb1a60a0y8966e00489954f48@mail.gmail.com>

On Tue, Mar 2, 2010 at 12:56 PM, Victor Subervi <victorsubervi at gmail.com>wrote:

> On Tue, Mar 2, 2010 at 11:53 AM, Victor Subervi <victorsubervi at gmail.com>wrote:
>
>> On Tue, Mar 2, 2010 at 11:48 AM, Victor Subervi <victorsubervi at gmail.com>wrote:
>>
>>> Hi;
>>> I have the following code:
>>>
>>> def my_mail():
>>>   user, passwd, db, host = login()
>>>   database = MySQLdb.connect(host, user, passwd, db)
>>>   cursor= database.cursor()
>>>   ourEmail1 = 'marilyn at globalsolutionsgroup.vi'
>>>   ourEmail1 = 'phil at globalsolutionsgroup.vi'
>>>   ourEmail2 = 'benoismyname at gmail.com'
>>>   form = cgi.FieldStorage()
>>>   name = form.getfirst('name', '')
>>>   email = form.getfirst('from', '')
>>>   message = form.getfirst('message', '')
>>>   message = 'Name: %s\nMessage: %s' % (name, message)
>>>   subject = 'Message from Web Site'
>>>   Email(
>>>       from_address = email,
>>>       to_address = ourEmail1,
>>>       subject = subject,
>>>       message = message
>>>   ).send()
>>>   Email(
>>>       from_address = email,
>>>       to_address = ourEmail2,
>>>       subject = subject,
>>>       message = message
>>>   ).send()
>>>   print 'Thank you, %s, we will get back to you shortly!<br />' % (name)
>>>
>>> This sends only the first of the two emails. Why doesn't it work to send
>>> the second? What do?
>>> TIA,
>>> beno
>>>
>>
>> Should I put a timer between instances of Email?
>>
>>>
>>> Adding a timer didn't work. Do I need to explicitly close the smtp
> connection before sending the next email? I don't understand why there's a
> problem.
> TIA,
> beno
>

Seems like the problem was I had to import simplemail for each of the
my_email functions.
beno

-- 
The Logos has come to bear
http://logos.13gems.com/
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From robert.kern at gmail.com  Tue Mar  2 13:39:10 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 02 Mar 2010 12:39:10 -0600
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <hmjjl2$r4m$1@dough.gmane.org>
References: <mailman.34.1267409372.23598.python-list@python.org>	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>	<hmi5ns$57b$1@dough.gmane.org>	<hmjena$n1p$1@dough.gmane.org>
	<hmjjl2$r4m$1@dough.gmane.org>
Message-ID: <hmjm0e$53r$1@dough.gmane.org>

On 2010-03-02 11:59 AM, Terry Reedy wrote:
> On 3/2/2010 11:34 AM, Robert Kern wrote:
>> On 2010-03-01 22:55 PM, Terry Reedy wrote:
>>> On 3/1/2010 7:56 PM, Patrick Maupin wrote:
>>>> On Mar 1, 5:57 pm, Erik Max Francis<m... at alcyone.com> wrote:
>>>>> Patrick Maupin wrote:
>>>>> This not only seriously stretching the meaning of the term "superset"
>>>>> (as Python is most definitely not even remotely a superset of JSON),
>>>>> but
>>>>
>>>> Well, you are entitled to that opinion, but seriously, if I take valid
>>>> JSON, replace unquoted true with True, unquoted false with False,
>>>> replace unquoted null with None, and take the quoted strings and
>>>> replace occurrences of \uXXXX with the appropriate unicode, then I do,
>>>> in fact, have valid Python. But don't take my word for it -- try it
>>>> out!
>>>
>>> To me this is so strained that I do not see why why you are arguing the
>>> point. So what? The resulting Python 'program' will be equivalent, I
>>> believe, to 'pass'. Ie, construct objects and then discard them with no
>>> computation or output.
>>
>> Not if you eval() rather than exec().
>
>  >>> eval(1)
>
> creates and objects and discards it, with a net result of 'pass'.
> What do you think I am missing.

x = eval('1')

> It's reasonably well-accepted that
>> JSON is very close to being a subset of Python's expression syntax with
>> just a few modifications.
>
> It is specifically JavaScript Object Notation, which is very similar to
> a subset of Python's object notation (number and string literals and
> list and dict displays (but not set displays), and three named
> constants). Without operators, it barely qualifies, to me, even as
> 'expression syntax'.

Literal expression syntax, then.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From albert at spenarnc.xs4all.nl  Tue Mar  2 13:48:59 2010
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 02 Mar 2010 18:48:59 GMT
Subject: Writing an assembler in Python
References: <Xns9D28186AF890Cfdnbgui7uhu5h8hrnuio@127.0.0.1>
Message-ID: <kyo49n.gr4@spenarnc.xs4all.nl>

In article <Xns9D28186AF890Cfdnbgui7uhu5h8hrnuio at 127.0.0.1>,
Giorgos Tzampanakis  <gt67 at hw.ac.uk> wrote:
>I'm implementing a CPU that will run on an FPGA. I want to have a
>(dead) simple assembler that will generate the machine code for
>me. I want to use Python for that. Are there any libraries that
>can help me with the parsing of the assembly code?

I have a pentium assembler in perl on my website below.
(postit-fixup principle).
You could borrow some idea's, if you can read perl.
The main purpose is to have a very simple and straightforward
assembler at the expense of ease of use.

Groetjes Albert
--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- being exponential -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From michaelveloz at gmail.com  Tue Mar  2 14:02:08 2010
From: michaelveloz at gmail.com (Veloz)
Date: Tue, 2 Mar 2010 11:02:08 -0800 (PST)
Subject: Queue peek?
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>
	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>
Message-ID: <58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>

On Mar 2, 1:18?pm, Raymond Hettinger <pyt... at rcn.com> wrote:
> On Mar 2, 8:29?am, Veloz <michaelve... at gmail.com> wrote:
>
> > Hi all
> > I'm looking for a queue that I can use with multiprocessing, which has
> > a peek method.
>
> > I've seen some discussion about queue.peek but don't see anything in
> > the docs about it.
>
> > Does python have a queue class with peek semantics?
>
> Am curious about your use case? ?Why peek at something
> that could be gone by the time you want to use it.
>
> ? val = q.peek()
> ? if something_i_want(val):
> ? ? ? ?v2 = q.get() ? ? ? ? # this could be different than val
>
> Wouldn't it be better to just get() the value and return if you don't
> need it?
>
> ? val = q.peek()
> ? if not something_i_want(val):
> ? ? ? q.put(val)
>
> Raymond

Yeah, I hear you. Perhaps queue is not the best solution. My highest
level use case is this:  The user visits a web page (my app is a
Pylons app) and requests a "report" be created. The report takes too
long to create and display on the spot, so the user expects to visit
some url "later" and see if the specific report has completed, and if
so, have it returned to them.

At a lower level, I'm thinking of using some process workers to create
these reports in the background; there'd be a request queue (into
which requests for reports would go, each with an ID) and a completion
queue, into which the workers would write an entry when a report was
created, along with an ID matching the original request.

The "peek" parts comes in when the user comes back later to see if
their report has done. That is, in my page controller logic, I'd like
to look through the complete queue and see if the specific report has
been finished (I could tell by matching up the ID of the original
request to the ID in the completed queue). If there was an item in the
queue matching the ID, it would be removed.

It's since occurred to me that perhaps a queue is not the best way to
handle the completions. (We're ignoring the file system as a solution
for the time being, and focusing on in-memory structures). I'm
wondering now if a simple array of completed items wouldn't be better.
Of course, all the access to the array would have to be thread/process-
proof.  As you pointed out, for example, multi-part operations such as
"is such-and-such an ID in the list? If so, remove it and return in"
would have to be treated atomically to avoid concurrency issues.

Any thoughts on this design approach are welcomed :-)
Michael



From philip at semanchuk.com  Tue Mar  2 14:28:57 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 2 Mar 2010 14:28:57 -0500
Subject: freebsd and multiprocessing
In-Reply-To: <4079148c-3690-4c24-b3db-79f685bf8eab@q15g2000yqj.googlegroups.com>
References: <7cabdddf-d936-48c7-9b76-97c37def5f8f@z35g2000yqd.googlegroups.com>
	<mailman.121.1267548737.23598.python-list@python.org>
	<5c8d7d72-710a-41c1-897e-8d5605c61373@e7g2000yqf.googlegroups.com>
	<4079148c-3690-4c24-b3db-79f685bf8eab@q15g2000yqj.googlegroups.com>
Message-ID: <83E70F2A-6024-4790-AA29-60908CB0CFC4@semanchuk.com>


On Mar 2, 2010, at 1:31 PM, Tim Arnold wrote:

> On Mar 2, 12:59 pm, Tim Arnold <a_j... at bellsouth.net> wrote:
>> On Mar 2, 11:52 am, Philip Semanchuk <phi... at semanchuk.com> wrote:
>>> On Mar 2, 2010, at 11:31 AM, Tim Arnold wrote:
>>
>>>> Hi,
>>>> I'm intending to use multiprocessing on a freebsd machine (6.3
>>>> release, quad core, 8cpus, amd64). I see in the doc that on this
>>>> platform I can't use synchronize:
>>
>>>> ImportError: This platform lacks a functioning sem_open
>>>> implementation, therefore, the required synchronization primitives
>>>> needed will not function, see issue 3770.
>>
>>>> As far as I can tell, I have no need to synchronize the  
>>>> processes--I
>>>> have several processes run separately and I need to know when  
>>>> they're
>>>> all finished; there's no communication between them and each owns  
>>>> its
>>>> own log file for output.
>>
>>>> Is anyone using multiprocessing on FreeBSD and run into any other
>>>> gotchas?
>>
>>> Hi Tim,
>>> I don't use multiprocessing but I've written two low-level IPC
>>> packages, one for SysV IPC and the other for POSIX IPC.
>>
>>> I think that multiprocessing prefers POSIX IPC (which is where
>>> sem_open() comes from). I don't know what it uses if that's not
>>> available, but SysV IPC seems a likely alternative. I must  
>>> emphasize,
>>> however, that that's a guess on my part.
>>
>>> FreeBSD didn't have POSIX IPC support until 7.0, and that was sort  
>>> of
>>> broken until 7.2. As it happens, I was testing my POSIX IPC code
>>> against 7.2 last night and it works just fine.
>>
>>> SysV IPC works under FreeBSD 6 (and perhaps earlier versions; 6 is  
>>> the
>>> oldest I've tested). ISTR that by default each message queue is
>>> limited to 2048 bytes in total size. 'sysctl kern.ipc' can probably
>>> tell you that and may even let you change it. Other than that I  
>>> can't
>>> think of any SysV limitations that might bite you.
>>
>>> HTH
>>> Philip
>>
>> Hi Philip,
>> Thanks for that information. I wish I could upgrade the machine to
>> 7.2! alas, out of my power.  I get the following results from sysctl:
>> % sysctl kern.ipc | grep msg
>> kern.ipc.msgseg: 2048
>> kern.ipc.msgssz: 8
>> kern.ipc.msgtql: 40
>> kern.ipc.msgmnb: 2048
>> kern.ipc.msgmni: 40
>> kern.ipc.msgmax: 16384
>>
>> I'll write some test programs using multiprocessing and see how they
>> go before committing to rewrite my current code. I've also been
>> looking at 'parallel python' although it may have the same issues.http://www.parallelpython.com/
>>
>> thanks again,
>> --Tim
>
> Well that didn't work out well. I can't import either Queue or Pool
> from multiprocessing, so I'm back to the drawing board. I'll see now
> how parallel python does on freebsd.


Sorry to hear that didn't work for you. Should you need to get down to  
the nuts & bolts level, my module for SysV IPC is here:
http://semanchuk.com/philip/sysv_ipc/


Good luck with Parallel Python,
Philip



From pmaupin at gmail.com  Tue Mar  2 14:30:32 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Tue, 2 Mar 2010 11:30:32 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
	<hmi5ns$57b$1@dough.gmane.org> <hmjena$n1p$1@dough.gmane.org> 
	<mailman.128.1267552773.23598.python-list@python.org>
Message-ID: <d166cf7a-4ce5-4857-9d24-e095f73c2e6b@p3g2000pra.googlegroups.com>

On Mar 2, 11:59?am, Terry Reedy <tjre... at udel.edu> wrote:

> To me, comparing object notation with programming language is not
> helpful to the OP's purpose.

Yes, I agree, it was a distraction.  I fell into the trap of
responding to the ludicrous claim that "if X is a superset of Y, then
X cannot possibly look better than Y" (a claim made by multiple people
all thinking it was clever) by showing that Y has other supersets that
do in fact look better than Y.  In doing this, I made the mistake of
choosing a superset of an analogue to Y, rather than to Y itself.
When called out on it, I showed that, in fact, the actual X that IS a
superset of Y can be used in a way that looks better.  However, you
are right that JSON is such a small subset of JS that it's really
pretty ridiculous to even compare them, but that still makes the point
that the original argument I was trying to refute is completely
specious.  In retrospect, though, I should have chosen a better way to
make that point, because I let myself get caught up in making and then
defending a flippant statement that I don't really care about one way
or the other.

> His main claim is that JSON can be usefully
> extended but that YAML is too much, so that perhaps he, with help, can
> find a 'sweet spot' in between.

An excellent summary of my position.

Thanks,
Pat


From python at mrabarnett.plus.com  Tue Mar  2 14:44:53 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 02 Mar 2010 19:44:53 +0000
Subject: Queue peek?
In-Reply-To: <58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>
	<58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>
Message-ID: <4B8D6AB5.8010408@mrabarnett.plus.com>

Veloz wrote:
> On Mar 2, 1:18 pm, Raymond Hettinger <pyt... at rcn.com> wrote:
>> On Mar 2, 8:29 am, Veloz <michaelve... at gmail.com> wrote:
>>
>>> Hi all
>>> I'm looking for a queue that I can use with multiprocessing, which has
>>> a peek method.
>>> I've seen some discussion about queue.peek but don't see anything in
>>> the docs about it.
>>> Does python have a queue class with peek semantics?
>> Am curious about your use case?  Why peek at something
>> that could be gone by the time you want to use it.
>>
>>   val = q.peek()
>>   if something_i_want(val):
>>        v2 = q.get()         # this could be different than val
>>
>> Wouldn't it be better to just get() the value and return if you don't
>> need it?
>>
>>   val = q.peek()
>>   if not something_i_want(val):
>>       q.put(val)
>>
>> Raymond
> 
> Yeah, I hear you. Perhaps queue is not the best solution. My highest
> level use case is this:  The user visits a web page (my app is a
> Pylons app) and requests a "report" be created. The report takes too
> long to create and display on the spot, so the user expects to visit
> some url "later" and see if the specific report has completed, and if
> so, have it returned to them.
> 
> At a lower level, I'm thinking of using some process workers to create
> these reports in the background; there'd be a request queue (into
> which requests for reports would go, each with an ID) and a completion
> queue, into which the workers would write an entry when a report was
> created, along with an ID matching the original request.
> 
> The "peek" parts comes in when the user comes back later to see if
> their report has done. That is, in my page controller logic, I'd like
> to look through the complete queue and see if the specific report has
> been finished (I could tell by matching up the ID of the original
> request to the ID in the completed queue). If there was an item in the
> queue matching the ID, it would be removed.
> 
> It's since occurred to me that perhaps a queue is not the best way to
> handle the completions. (We're ignoring the file system as a solution
> for the time being, and focusing on in-memory structures). I'm
> wondering now if a simple array of completed items wouldn't be better.
> Of course, all the access to the array would have to be thread/process-
> proof.  As you pointed out, for example, multi-part operations such as
> "is such-and-such an ID in the list? If so, remove it and return in"
> would have to be treated atomically to avoid concurrency issues.
> 
> Any thoughts on this design approach are welcomed :-)
> 
A set of completed reports, or a dict with the ID as the key? The
advantage of a dict is that the value could contain several bits of
information, such as when it was completed, the status (OK or failed),
etc. You might want to wrap it in a class with locks (mutexes) to ensure
it's threadsafe.


From martin.hellwig at dcuktec.org  Tue Mar  2 14:58:22 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Tue, 02 Mar 2010 19:58:22 +0000
Subject: Queue peek?
In-Reply-To: <mailman.138.1267559095.23598.python-list@python.org>
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>	<58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>
	<mailman.138.1267559095.23598.python-list@python.org>
Message-ID: <hmjqkr$r46$1@news.eternal-september.org>

On 03/02/10 19:44, MRAB wrote:
<cut>
> information, such as when it was completed, the status (OK or failed),
> etc. You might want to wrap it in a class with locks (mutexes) to ensure
> it's threadsafe.
What actually happens if multiple threads at the same time, write to a 
shared dictionary (Not using the same key)?

I would think that if the hashing part of the dictionary has some sort 
of serialization (please forgive me if I misuse a term) it should 'just 
work'(tm)?

-- 
mph



From marduk at python.net  Tue Mar  2 15:22:27 2010
From: marduk at python.net (Albert Hopkins)
Date: Tue, 02 Mar 2010 15:22:27 -0500
Subject: os.fdopen() issue in Python 3.1?
In-Reply-To: <hmjl6a$230$1@dough.gmane.org>
References: <1267539898.477222.7.camel@necropolis>
	<hmjl6a$230$1@dough.gmane.org>
Message-ID: <1267561347.4507.5.camel@necropolis>

On Tue, 2010-03-02 at 13:25 -0500, Terry Reedy wrote:

> To get help, or report a bug, for something like this, be as specific as 
> possible. 'Linux' may be too generic.

This is on Python on Gentoo Linux x64 with kernel 2.6.33.

> 
> > However, with CPython 3.1 I get:
> >
> >              input = os.fdopen(fd).read()
> >          IOError: [Errno 5] Input/output error
> >
> > Is there something wrong in Python 3.1?  Is this the correct way to do
> > this (run a process in a pseudo-tty and read it's output) or is there
> > another way I should/could be doing this?
> 
> No idea, however, the first thing I would do is call the .fdopen and 
> .read methods separately (on separate lines) to isolate which is raising 
> the error.

The exception occurs on the read() method.




From marduk at python.net  Tue Mar  2 15:22:58 2010
From: marduk at python.net (Albert Hopkins)
Date: Tue, 02 Mar 2010 15:22:58 -0500
Subject: os.fdopen() issue in Python 3.1?
In-Reply-To: <4B8D4BB8.8020909@mrabarnett.plus.com>
References: <1267539898.477222.7.camel@necropolis>
	<4B8D4BB8.8020909@mrabarnett.plus.com>
Message-ID: <1267561378.4507.6.camel@necropolis>

On Tue, 2010-03-02 at 17:32 +0000, MRAB wrote:
> The documentation also mentions the 'pty' module. Have you tried that
> instead? 

I haven't but I'll give it a try.  Thanks.

-a




From daniel at stutzbachenterprises.com  Tue Mar  2 15:33:33 2010
From: daniel at stutzbachenterprises.com (Daniel Stutzbach)
Date: Tue, 2 Mar 2010 14:33:33 -0600
Subject: Queue peek?
In-Reply-To: <hmjqkr$r46$1@news.eternal-september.org>
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>
	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>
	<58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>
	<mailman.138.1267559095.23598.python-list@python.org>
	<hmjqkr$r46$1@news.eternal-september.org>
Message-ID: <eae285401003021233i7a62771h590a557341f10ca4@mail.gmail.com>

On Tue, Mar 2, 2010 at 1:58 PM, Martin P. Hellwig <
martin.hellwig at dcuktec.org> wrote:

> What actually happens if multiple threads at the same time, write to a
> shared dictionary (Not using the same key)?
>

All of Python's built-in types are thread safe.  Both updates will happen.
--
Daniel Stutzbach, Ph.D.
President, Stutzbach Enterprises, LLC <http://stutzbachenterprises.com>
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From mrkafk at gmail.com  Tue Mar  2 15:41:44 2010
From: mrkafk at gmail.com (mk)
Date: Tue, 02 Mar 2010 21:41:44 +0100
Subject: conditional import into global namespace
In-Reply-To: <16651e81003021031h3831d4b3i844f331f3d301042@mail.gmail.com>
References: <hmjita$ms4$1@dough.gmane.org>
	<16651e81003021031h3831d4b3i844f331f3d301042@mail.gmail.com>
Message-ID: <hmjt64$63s$1@dough.gmane.org>

Jerry Hill wrote:
> Just import subprocess at the top of your module.  If subprocess
> hasn't been imported yet, it will be imported when your module is
> loaded.  If it's already been imported, your module will use the
> cached version that's already been imported.
> 
> In other words, it sounds like Python already does what you want.  You
> don't need to do anything special.

Oh, thanks!

Hmm it's different than dealing with packages I guess -- IIRC, in 
packages only code in package's __init__.py was executed?

Regards,
mk




From popuser at christest2.dc.k12us.com  Tue Mar  2 15:57:36 2010
From: popuser at christest2.dc.k12us.com (Pop User)
Date: Tue, 02 Mar 2010 15:57:36 -0500
Subject: freebsd and multiprocessing
In-Reply-To: <5c8d7d72-710a-41c1-897e-8d5605c61373@e7g2000yqf.googlegroups.com>
References: <7cabdddf-d936-48c7-9b76-97c37def5f8f@z35g2000yqd.googlegroups.com>	<mailman.121.1267548737.23598.python-list@python.org>
	<5c8d7d72-710a-41c1-897e-8d5605c61373@e7g2000yqf.googlegroups.com>
Message-ID: <4B8D7BC0.6010109@christest2.dc.k12us.com>

On 3/2/2010 12:59 PM, Tim Arnold wrote:
> 
> I'll write some test programs using multiprocessing and see how they
> go before committing to rewrite my current code. I've also been
> looking at 'parallel python' although it may have the same issues.
> http://www.parallelpython.com/
> 

parallelpython works for me on FreeBSD 6.2.



From matt at sidefx.com  Tue Mar  2 15:59:15 2010
From: matt at sidefx.com (Matt Chaput)
Date: Tue, 02 Mar 2010 15:59:15 -0500
Subject: Multiprocessing problem
Message-ID: <4B8D7C23.7050905@sidefx.com>

Hi,

I'm having a problem with the multiprocessing package.

I'm trying to use a simple pattern where a supervisor object starts a 
bunch of worker processes, instantiating them with two queues (a job 
queue for tasks to complete and an results queue for the results). The 
supervisor puts all the jobs in the "job" queue, then join()s the 
workers, and then pulls all the completed results off the "results" queue.

(I don't think I can just use something like Pool.imap_unordered for 
this because the workers need to be objects with state.)

Here's a simplified example:

http://pastie.org/850512

The problem is that seemingly randomly, but almost always, the worker 
processes will deadlock at some point and stop working before they 
complete. This will leave the whole program stalled forever. This seems 
more likely the more work each worker does (to the point where adding 
the time.sleep(0.01) as seen in the example code above guarantees it). 
The problem seems to occur on both Windows and Mac OS X.

I've tried many random variations of the code (e.g. using JoinableQueue, 
calling cancel_join_thread() on one or both queues even though I have no 
idea what it does, etc.) but keep having the problem.

Am I just using multiprocessing wrong? Is this a bug? Any advice?

Thanks,

Matt


From rfritz at u.washington.edu  Tue Mar  2 16:14:50 2010
From: rfritz at u.washington.edu (R Fritz)
Date: Tue, 2 Mar 2010 13:14:50 -0800
Subject: cpan for python?
References: <mailman.20.1267367545.23598.python-list@python.org>
Message-ID: <hmjv4b$mqk$1@reader1.panix.com>

On 2010-02-28 06:31:56 -0800, ssteinerX at gmail.com said:

> 
> On Feb 28, 2010, at 9:28 AM, Someone Something wrote:
> 
>> Is there something like cpan for python? I like python's syntax, but 
>> Iuse perl because of cpan and the tremendous modules that it has.  --
> 
> Please search the mailing list archives.
> 
> This subject has been discussed to absolute death.

But somehow the question is not in the FAQ, though the answer is. See:
  
<http://www.python.org/doc/faq/library/#how-do-i-find-a-module-or-application-to-perform-task-x>

-- 


Randolph Fritz
  design machine group, architecture department, university of washington
rfritz at u.washington.edu -or- rfritz333 at gmail.com



From ben+python at benfinney.id.au  Tue Mar  2 16:22:40 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 03 Mar 2010 08:22:40 +1100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
	<mailman.78.1267477780.23598.python-list@python.org>
	<20100302183527.47c6e8f5@geekmail.INVALID>
Message-ID: <878waazae7.fsf@benfinney.id.au>

Andreas Waldenburger <usenot at geekmail.INVALID> writes:

> Don't get me wrong; our whole system is more fragile than I find
> comfortable. But I guess getting 10ish different parties around the
> globe to work in complete unison is quite a feat, and I'm surprised it
> even works as it is. But it does, and I'm glad we don't have to
> micromanage other people's code.

It's rather odd that you think of ?require general quality standards,
independently measurable and testable? to be ?micromanaging?.

I guess that when even the *customers* will resist implementing such
quality expectations, it's little surprise that the vendors continue to
push out such shoddy work on their customers.

-- 
 \     ?Why am I an atheist? I ask you: Why is anybody not an atheist? |
  `\      Everyone starts out being an atheist.? ?Andy Rooney, _Boston |
_o__)                                                Globe_ 1982-05-30 |
Ben Finney


From davea at ieee.org  Tue Mar  2 16:23:34 2010
From: davea at ieee.org (Dave Angel)
Date: Tue, 02 Mar 2010 16:23:34 -0500
Subject: Adding to a module's __dict__?
In-Reply-To: <hmjifd$ju3$1@dough.gmane.org>
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>	<mailman.96.1267508316.23598.python-list@python.org>	<roy-3CB7A4.08210202032010@news.panix.com>	<mailman.107.1267536800.23598.python-list@python.org>	<f4c188f0-7dba-4629-8a16-eed713b5920f@15g2000yqa.googlegroups.com>	<4B8D3A3A.8030501@optimum.net>
	<hmjifd$ju3$1@dough.gmane.org>
Message-ID: <4B8D81D6.4070001@ieee.org>

Terry Reedy wrote:
> On 3/2/2010 11:18 AM, John Posner wrote:
>> On 3/2/2010 10:19 AM, Roy Smith wrote:
>>>
>>> Somewhat sadly, in my case, I can't even machine process the header
>>> file. I don't, strictly speaking, have a header file. What I have is
>>> a PDF which documents what's in the header file, and I'm manually re-
>>> typing the data out of that. Sigh.
>
> There are Python modules to read/write pdf.
>
>> Here's an idea, perhaps too obvious, to minimize your keystrokes:
>>
>> 1. Create a text file with the essential data:
>>
>> XYZ_FOO 0 The foo property
>> XYZ_BAR 1 The bar property
>> XYZ_BAZ 2 reserved for future use
>>
>> 2. Use a Python script to convert this into the desired code:
>>
>> declare('XYZ_FOO', 0, "The foo property")
>> declare('XYZ_BAR', 1, "The bar property")
>> declare('XYZ_BAZ', 2, "reserved for future use")
>>
>> Note:
>>
>>  >>> s
>> 'XYZ_FOO 0 The foo property'
>>  >>> s.split(None, 2)
>> ['XYZ_FOO', '0', 'The foo property']
>
> Given that set of triples is constant, I would think about having the 
> Python script do the computation just once, instead of with every 
> inport. In other words, the script should *call* the declare function 
> and then write out the resulting set of dicts either to a .py or 
> pickle file.
>
> tjr
>
>
There have been lots of good suggestions in this thread.  Let me give 
you my take:

1) you shouldn't want to clutter up the global dictionary of your main 
processing module.  There's too much risk of getting a collision, either 
with the functions you write, or with some builtin.  That's especially 
true if you might later want to use a later version of that pdf file.  
Easiest solution for your purposes, make it a separate module.  Give it 
a name like defines, and in your main module, you use

import defines
print  defines.XYZ_FOO

And if that's too much typing, you can do:
import defines as I
print  I.XYZ_FOO

Next problem is to parse that pdf file.  One solution is to use a pdf 
library.  But another is to copy/paste it into a text file, and parse 
that.   Assuming it'll paste, and that the lines you want are 
recognizable (eg. they all begin as  #define), the parsing should be 
pretty easy.  The results of the parsing is a file  defines.py

Now, if the pdf ever changes, rerun your parsing program.  But don't run 
it every time your application runs.

If the pdf file were changing often, then I'd have a different answer:
2) define an empty class, just as a placeholder, and make one instance I
      Populate a class instance I with    setattrib() calls, but access 
it with direct syntax, same as our first example.


DaveA



From ben+python at benfinney.id.au  Tue Mar  2 16:25:13 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 03 Mar 2010 08:25:13 +1100
Subject: Broken references in postings
References: <hmjiuc$7pk$1@reader1.panix.com>
Message-ID: <874okyza9y.fsf@benfinney.id.au>

Grant Edwards <invalid at invalid.invalid> writes:

> Or is it just individual news/mail clients that are broken?

This, I believe. Many clients mess up the References and In-Reply-To
fields, in the face of many years of complaint to the vendors.

Most free-software clients get it right, AFAICT.

-- 
 \      ?Contentment is a pearl of great price, and whosoever procures |
  `\        it at the expense of ten thousand desires makes a wise and |
_o__)                                      happy purchase.? ?J. Balguy |
Ben Finney


From dont.spam.holgerm1969 at gmx.de  Tue Mar  2 16:26:59 2010
From: dont.spam.holgerm1969 at gmx.de (Holger Mueller)
Date: Tue, 2 Mar 2010 22:26:59 +0100
Subject: Writing an assembler in Python
References: <Xns9D28186AF890Cfdnbgui7uhu5h8hrnuio@127.0.0.1>
Message-ID: <hmjvr3$r45$03$2@news.t-online.com>

Giorgos Tzampanakis <gt67 at hw.ac.uk> wrote:
> I'm implementing a CPU that will run on an FPGA. I want to have a  
> (dead) simple assembler that will generate the machine code for 
> me. I want to use Python for that. Are there any libraries that 
> can help me with the parsing of the assembly code?

Why coding assembler if you can type in hexdumps...

scnr
    Holger
-- 
http://www.kati-und-holger.de/holgersblog.php


From MLMDev at Comcast.net  Tue Mar  2 16:48:08 2010
From: MLMDev at Comcast.net (Mitchell L Model)
Date: Tue, 2 Mar 2010 16:48:08 -0500
Subject: CGI, POST, and file uploads
Message-ID: <5F601006-5DCE-4353-BD04-DFABDFA8C5D2@Comcast.net>

Can someone tell me how to upload the contents of a (relatively small)  
file using an HTML form and CGI in Python 3.1? As far as I can tell  
from a half-day of experimenting, browsing, and searching the Python  
issue tracker, this is broken.  Very simple example:

<html>
   <head>
   </head>
   <body>
     <form action="http://localhost:9000/cgi/cgi-test.py"
	  enctype="multipart/form-data"
	  method="post">
	<label>File</label><br/>
	  <input type="file" name="contents"> <br/>
	<button type="submit" >Submit</button> <br/>
     </form>
   </body>
</html>


cgi-test.py:


#!/usr/local/bin/python3
import cgi
import sys
form = cgi.FieldStorage()
print(form.getfirst('contents'), file=sys.stderr)
print('done')


I run a CGI server with:

#!/usr/bin/env python3
from http.server import HTTPServer, CGIHTTPRequestHandler
HTTPServer(('', 9000), CGIHTTPRequestHandler).serve_forever()



What happens is that the upload never stops. It works in 2.6.

If I cancel the upload from the browser, I get the following output,  
so I know that basically things are working;
the cgi script just never finishes reading the POST input:

localhost - - [02/Mar/2010 16:37:36] "POST /cgi/cgi-test.py HTTP/1.1"  
200 -
<<<CONTENTS OF MY FILE PRINTED HERE>>>
----------------------------------------
Exception happened during processing of request from ('127.0.0.1',  
55779)
Traceback (most recent call last):
   File "/Library/Frameworks/Python.framework/Versions/3.1/lib/ 
python3.1/socketserver.py", line 281, in _handle_request_noblock
     self.process_request(request, client_address)
   File "/Library/Frameworks/Python.framework/Versions/3.1/lib/ 
python3.1/socketserver.py", line 307, in process_request
     self.finish_request(request, client_address)
   File "/Library/Frameworks/Python.framework/Versions/3.1/lib/ 
python3.1/socketserver.py", line 320, in finish_request
     self.RequestHandlerClass(request, client_address, self)
   File "/Library/Frameworks/Python.framework/Versions/3.1/lib/ 
python3.1/socketserver.py", line 614, in __init__
     self.handle()
   File "/Library/Frameworks/Python.framework/Versions/3.1/lib/ 
python3.1/http/server.py", line 352, in handle
     self.handle_one_request()
   File "/Library/Frameworks/Python.framework/Versions/3.1/lib/ 
python3.1/http/server.py", line 346, in handle_one_request
     method()
   File "/Library/Frameworks/Python.framework/Versions/3.1/lib/ 
python3.1/http/server.py", line 868, in do_POST
     self.run_cgi()
   File "/Library/Frameworks/Python.framework/Versions/3.1/lib/ 
python3.1/http/server.py", line 1045, in run_cgi
     if not self.rfile.read(1):
   File "/Library/Frameworks/Python.framework/Versions/3.1/lib/ 
python3.1/socket.py", line 214, in readinto
     return self._sock.recv_into(b)
socket.error: [Errno 54] Connection reset by peer
----------------------------------------




From usenot at geekmail.INVALID  Tue Mar  2 16:51:56 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Tue, 2 Mar 2010 22:51:56 +0100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
	<87eik3zmi8.fsf@benfinney.id.au>
	<20100302184056.743a71e7@geekmail.INVALID>
	<mailman.129.1267553139.23598.python-list@python.org>
Message-ID: <20100302225156.67171851@geekmail.INVALID>

On Tue, 02 Mar 2010 19:05:25 +0100 Jean-Michel Pichavant
<jeanmichel at sequans.com> wrote:

> Andreas Waldenburger wrote:
> > 
> > I had hoped that everyone just read it, went like "Oh geez.",
> > smiled it off with a hint of lesson learned and got back to
> > whatever it was they were doing. Alas, I was wrong ... and I'm
> > sorry.
> >
> There's something wrong saying that stupid people write working code 
> that totally satisfies your needs. Don't you agree ? ;-)
> 
No, in fact I don't.

It works. They are supposed to make it work. And that's what they do.
Whether or not they put their docstrings in the place they should does
not change that their code works.

Sorry, you guys drained all the funny out of me.

/W

-- 
INVALID? DE!



From mrkafk at gmail.com  Tue Mar  2 16:54:39 2010
From: mrkafk at gmail.com (mk)
Date: Tue, 02 Mar 2010 22:54:39 +0100
Subject: Queue peek?
In-Reply-To: <eae285401003021233i7a62771h590a557341f10ca4@mail.gmail.com>
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>	<58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>	<mailman.138.1267559095.23598.python-list@python.org>	<hmjqkr$r46$1@news.eternal-september.org>
	<eae285401003021233i7a62771h590a557341f10ca4@mail.gmail.com>
Message-ID: <hmk1er$mlb$1@dough.gmane.org>

Daniel Stutzbach wrote:
> On Tue, Mar 2, 2010 at 1:58 PM, Martin P. Hellwig 
> <martin.hellwig at dcuktec.org <mailto:martin.hellwig at dcuktec.org>> wrote:
> 
>     What actually happens if multiple threads at the same time, write to
>     a shared dictionary (Not using the same key)?

> All of Python's built-in types are thread safe.  Both updates will happen.

No need to use synchro primitives like locks?

I know that it may work, but that strikes me as somehow wrong... I'm 
used to using things like Lock().acquire() and Lock().release() when 
accessing shared data structures, whatever they are.

Although trying to do the "right thing" may indeed get one in trouble in 
case of deadlock caused by a bug in one's own program.

Regards,
mk




From eike.welk at gmx.net  Tue Mar  2 17:00:29 2010
From: eike.welk at gmx.net (Eike Welk)
Date: Tue, 02 Mar 2010 23:00:29 +0100
Subject: Method / Functions - What are the differences?
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
	<mailman.109.1267539415.23598.python-list@python.org>
Message-ID: <hmk1mn$70u$1@newsreader3.netcologne.de>

John Posner wrote:
> I've updated the text at this location:
> 
>  >   http://cl1p.net/bruno_0301.rst/

I think this is a very useful writeup! 

It would be perfect with a little bit of introduction that says:
1. - What it is: "The rough details of method look-up";
2. - which contains some of the questions that that made that authors write 
the text. This way people with similar questions can find it with Google.

Additionally the link to the relevant section in the Python documentation 
would be great. I can't find it!

A link to an article about the details of class creation and metaclasses 
would be good too.


Thanks for writing this great little text,
Eike.



From jkrukoff at ltgc.com  Tue Mar  2 17:08:43 2010
From: jkrukoff at ltgc.com (John Krukoff)
Date: Tue, 02 Mar 2010 15:08:43 -0700
Subject: Queue peek?
In-Reply-To: <hmk1er$mlb$1@dough.gmane.org>
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>
	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>
	<58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>
	<mailman.138.1267559095.23598.python-list@python.org>
	<hmjqkr$r46$1@news.eternal-september.org>
	<eae285401003021233i7a62771h590a557341f10ca4@mail.gmail.com>
	<hmk1er$mlb$1@dough.gmane.org>
Message-ID: <1267567723.4101.28.camel@localhost.localdomain>

On Tue, 2010-03-02 at 22:54 +0100, mk wrote:
<snip>
> No need to use synchro primitives like locks?
> 
> I know that it may work, but that strikes me as somehow wrong... I'm 
> used to using things like Lock().acquire() and Lock().release() when 
> accessing shared data structures, whatever they are.
<snip>

This is one of those places where the GIL is a good thing, and makes
your life simpler. You could consider it that the interpreter does the
locking for you for such primitive operations, if you like.
-- 
John Krukoff <jkrukoff at ltgc.com>
Land Title Guarantee Company



From usenot at geekmail.INVALID  Tue Mar  2 17:19:09 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Tue, 2 Mar 2010 23:19:09 +0100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
	<mailman.78.1267477780.23598.python-list@python.org>
	<20100302183527.47c6e8f5@geekmail.INVALID>
	<878waazae7.fsf@benfinney.id.au>
Message-ID: <20100302231909.6a5bad2d@geekmail.INVALID>

On Wed, 03 Mar 2010 08:22:40 +1100 Ben Finney
<ben+python at benfinney.id.au> wrote:

> Andreas Waldenburger <usenot at geekmail.INVALID> writes:
> 
> > Don't get me wrong; our whole system is more fragile than I find
> > comfortable. But I guess getting 10ish different parties around the
> > globe to work in complete unison is quite a feat, and I'm surprised
> > it even works as it is. But it does, and I'm glad we don't have to
> > micromanage other people's code.
> 
> It's rather odd that you think of ?require general quality standards,
> independently measurable and testable? to be ?micromanaging?.
> 
I should know better than to argue these things, but I don't. Hmph.

We demand testable quality standards, but not of their code. We demand
it of their software. We say *what* we want, they decide *how* they'll
do it. Noncompliance will be fined, by a contractually agreed
amount. Everything beyond that is micromanaging and detracts workforce
from the stuff *we* have to do.

We are in exactly the same kind of bond with a company that buys our
system (and support). I have yet to see any one of them demand to see
how we write our code. Why should they care? (Rhetorical question, I
refuse to discuss this any further.)


> I guess that when even the *customers* will resist implementing such
> quality expectations, it's little surprise that the vendors continue
> to push out such shoddy work on their customers.
> 
When I'm building bicycles I can go to the trouble of going by what
method of galvanization my tires are produced. Or I save myself the
trouble and just take the best offer and hold them responsible when
they don't deliver on their promise. Both possible, both work, and both
appropriate in certain situations.

You can keep discussing if you want, I've said more than I was hoping
to.

/W


-- 
INVALID? DE!



From albert at spenarnc.xs4all.nl  Tue Mar  2 17:38:11 2010
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 02 Mar 2010 22:38:11 GMT
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org>
Message-ID: <kyoevn.k63@spenarnc.xs4all.nl>

In article <hm9cbc$9p4$1 at speranza.aioe.org>, Mel  <mwilson at the-wire.com> wrote:
>Jean-Michel Pichavant wrote:
>> Andreas Waldenburger wrote:
>>> On Fri, 26 Feb 2010 09:09:36 -0600 Tim Daneliuk <tundra at tundraware.com>
>>> wrote:
>>>> Reminiscent of:
>>>> mov  AX,BX               ; Move the contents of BX into AX
>
>>> Well, there might be some confusion there as to what gets moved where,
>>> wouldn't you say? I guess this goes away after a couple of months,
>>> though.
>
>> I agree to that statement, I was surprised that mov AX,BX assumes that
>> BX is the source, and AX the destination. I never programmed in
>> assembler though.
>
>You could think of it as a not bad use of the design principle "Clear The
>Simple Stuff Out Of The Way First".  Destinations are commonly a lot simpler
>than sources -- just as in Python assignment statements.  So you can tell
>more or less at a glance what's going to be changed, then get into the deep
>analysis to find what it's going to be changed to.

The real background is that a very long time ago at Intel
the first guy that wrote an assembler, got it "wrong", i.e.
violated the conventions established already at the time.

No nothing clever, nothing conscious, just reinventing the wheel
badly.

Next time you tell me that the MSDOS "file" system was well thought
out :-)

>       Mel.

Groetjes Albert

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- being exponential -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From verace at bohlsenrestaurants.com  Tue Mar  2 17:39:46 2010
From: verace at bohlsenrestaurants.com (Sugar Dining Den and Social Club)
Date: Tue, 02 Mar 2010 14:39:46 -0800
Subject: Verace Hospitality Late Night Dinner
Message-ID: <EC.AE.03209.2B39D8B4@msg-002.msxtra.com>

An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20100302/bbb7a9ee/attachment-0001.html>

From tomf.sessile at gmail.com  Tue Mar  2 17:47:36 2010
From: tomf.sessile at gmail.com (TomF)
Date: Tue, 2 Mar 2010 14:47:36 -0800
Subject: cpan for python?
References: <mailman.20.1267367545.23598.python-list@python.org>
	<hmjv4b$mqk$1@reader1.panix.com>
Message-ID: <2010030214473616807-tomfsessile@gmailcom>

On 2010-03-02 13:14:50 -0800, R Fritz <rfritz at u.washington.edu> said:

> On 2010-02-28 06:31:56 -0800, ssteinerX at gmail.com said:
>> 
>> On Feb 28, 2010, at 9:28 AM, Someone Something wrote:
>> 
>>> Is there something like cpan for python? I like python's syntax, but 
>>> Iuse perl because of cpan and the tremendous modules that it has.  --
>> 
>> Please search the mailing list archives.
>> 
>> This subject has been discussed to absolute death.
> 
> But somehow the question is not in the FAQ, though the answer is. See:
>   
> <http://www.python.org/doc/faq/library/#how-do-i-find-a-module-or-application-to-perform-task-x>

There 
> 
is also a program called cpan, distributed with Perl.  It is used for 
searching, downloading, installing and testing modules from the CPAN 
repository.  It's far more extensive than setuptools.  AFAIK the python 
community has developed nothing like it.

-Tom



From aahz at pythoncraft.com  Tue Mar  2 17:53:32 2010
From: aahz at pythoncraft.com (Aahz)
Date: 2 Mar 2010 14:53:32 -0800
Subject: Broken references in postings
References: <hmjiuc$7pk$1@reader1.panix.com>
Message-ID: <hmk4tc$mol$1@panix5.panix.com>

In article <hmjiuc$7pk$1 at reader1.panix.com>,
Grant Edwards  <invalid at invalid.invalid> wrote:
>
>I've noticed recently that a lot of the "refernces" and
>"in-reply-to" headers in c.l.p are broken, resulting in the
>inability to move from a child to a parent in a tree.

One issue with the mail/news gateway is that (unless it's been fixed)
In-Reply-To: does not get copied to References: (which is what most
newsreaders need to thread properly).
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From aahz at pythoncraft.com  Tue Mar  2 17:59:14 2010
From: aahz at pythoncraft.com (Aahz)
Date: 2 Mar 2010 14:59:14 -0800
Subject: Is this secure?
References: <mailman.110.1266935711.4577.python-list@python.org>
	<mailman.247.1267115557.4577.python-list@python.org>
	<hmd5v7$bir$1@panix5.panix.com>
	<mailman.120.1267548006.23598.python-list@python.org>
Message-ID: <hmk582$sqq$1@panix5.panix.com>

In article <mailman.120.1267548006.23598.python-list at python.org>,
Robert Kern  <robert.kern at gmail.com> wrote:
>On 2010-02-28 01:28 AM, Aahz wrote:
>> In article<mailman.247.1267115557.4577.python-list at python.org>,
>> Robert Kern<robert.kern at gmail.com>  wrote:
>>>
>>> If you are storing the password instead of making your user remember
>>> it, most platforms have some kind of keychain secure password
>>> storage. I recommend reading up on the APIs available on your targeted
>>> platforms.
>>
>> Are you sure?  I haven't done a lot of research, but my impression was
>> that Windows didn't have anything built in.
>
>You're right, not built-in, but Windows does provide enough crypto
>services for a cross-platform Python implementation to be built:
>
>   http://pypi.python.org/pypi/keyring

Thanks you!  That's a big help!
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From aahz at pythoncraft.com  Tue Mar  2 18:01:31 2010
From: aahz at pythoncraft.com (Aahz)
Date: 2 Mar 2010 15:01:31 -0800
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<87eik3zmi8.fsf@benfinney.id.au>
	<20100302184056.743a71e7@geekmail.INVALID>
	<20100302225156.67171851@geekmail.INVALID>
Message-ID: <hmk5cb$9j1$1@panix5.panix.com>

In article <20100302225156.67171851 at geekmail.INVALID>,
Andreas Waldenburger  <usenot at geekmail.INVALID> wrote:
>
>Sorry, you guys drained all the funny out of me.

Don't let a few nitpickers do that!  I thought it was funny; after that,
just remember that every Usenet thread drifts away from *your* point.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From matt at whoosh.ca  Tue Mar  2 18:04:09 2010
From: matt at whoosh.ca (Matt Chaput)
Date: Tue, 02 Mar 2010 18:04:09 -0500
Subject: Multiprocessing problem
In-Reply-To: <4B8D7C23.7050905@sidefx.com>
References: <4B8D7C23.7050905@sidefx.com>
Message-ID: <4B8D9969.60801@whoosh.ca>

On 3/2/2010 3:59 PM, Matt Chaput wrote:
 > I'm trying to use a simple pattern where a supervisor object starts a
 > bunch of worker processes, instantiating them with two queues (a job
 > queue for tasks to complete and an results queue for the results). The
 > supervisor puts all the jobs in the "job" queue, then join()s the
 > workers, and then pulls all the completed results off the "results" 
queue.

 > Here's a simplified example:
 >
 > http://pastie.org/850512

I should mention that if I change my code so the workers just pull 
things off the job queue but don't put any results on the result queue 
until after they see the None sentinel in the job queue and break out of 
the loop, I don't get the deadlock. So it's something about getting from 
one queue and putting to another queue in close proximity.

Hopefully I'm making a simple mistake with how I'm using the library and 
it'll be easy to fix...

Thanks,

Matt


From invalid at invalid.invalid  Tue Mar  2 18:12:17 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Tue, 2 Mar 2010 23:12:17 +0000 (UTC)
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <kyoevn.k63@spenarnc.xs4all.nl>
Message-ID: <hmk60h$nce$1@reader1.panix.com>

On 2010-03-02, Albert van der Horst <albert at spenarnc.xs4all.nl> wrote:

> No nothing clever, nothing conscious, just reinventing the wheel
> badly.
>
> Next time you tell me that the MSDOS "file" system was well thought
> out :-)

Just a mediocre copy of the CP/M filesystem, which was in turn
copied from DEC's RSTS or RSX.

-- 
Grant Edwards               grant.b.edwards        Yow! Kids, don't gross me
                                  at               off ... "Adventures with
                              gmail.com            MENTAL HYGIENE" can be
                                                   carried too FAR!


From steve at holdenweb.com  Tue Mar  2 18:24:51 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 02 Mar 2010 18:24:51 -0500
Subject: Email Script
In-Reply-To: <4dc0cfea1003020753g404e6fbcr29ed52e21e2bb18c@mail.gmail.com>
References: <4dc0cfea1003020748g786aded2i9c5287972aa8984c@mail.gmail.com>
	<4dc0cfea1003020753g404e6fbcr29ed52e21e2bb18c@mail.gmail.com>
Message-ID: <hmk6o3$8gf$1@dough.gmane.org>

Victor Subervi wrote:
> On Tue, Mar 2, 2010 at 11:48 AM, Victor Subervi <victorsubervi at gmail.com
[...]
>     This sends only the first of the two emails. Why doesn't it work to
>     send the second? What do?
>     TIA,
>     beno
> 
> 
> Should I put a timer between instances of Email? 
> 
> 
Np.

http://en.wikipedia.org/wiki/Cargo_cult_programming

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at REMOVE-THIS-cybersource.com.au  Tue Mar  2 18:32:52 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 02 Mar 2010 23:32:52 GMT
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
	<87eik3zmi8.fsf@benfinney.id.au>
	<20100302184056.743a71e7@geekmail.INVALID>
	<mailman.129.1267553139.23598.python-list@python.org>
	<20100302225156.67171851@geekmail.INVALID>
Message-ID: <4b8da024$0$8783$c3e8da3@news.astraweb.com>

On Tue, 02 Mar 2010 22:51:56 +0100, Andreas Waldenburger wrote:

> On Tue, 02 Mar 2010 19:05:25 +0100 Jean-Michel Pichavant
> <jeanmichel at sequans.com> wrote:
> 
>> Andreas Waldenburger wrote:
>> > 
>> > I had hoped that everyone just read it, went like "Oh geez.", smiled
>> > it off with a hint of lesson learned and got back to whatever it was
>> > they were doing. Alas, I was wrong ... and I'm sorry.
>> >
>> There's something wrong saying that stupid people write working code
>> that totally satisfies your needs. Don't you agree ? ;-)
>> 
> No, in fact I don't.
> 
> It works. They are supposed to make it work. And that's what they do.
> Whether or not they put their docstrings in the place they should does
> not change that their code works.
> 
> Sorry, you guys drained all the funny out of me.

Most of the customers I've worked for have insisted we follow best 
practices. Sometimes they even invent their own best practices that 
nobody has even heard of, and that's fun (not). You're the first one I've 
ever met that bitches publicly that your contractors don't follow best 
practice, but objects strenuously to the idea that you are right to care 
about that they don't.

Wow. Just... wow.

P.S. next time you want some not-quite-best-practice Python code written, 
send me an email off-list. I'll be more than happy to do not-quite-best-
practice work for you. 

*wink*



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Tue Mar  2 18:34:02 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 02 Mar 2010 23:34:02 GMT
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
	<mailman.78.1267477780.23598.python-list@python.org>
	<20100302183527.47c6e8f5@geekmail.INVALID>
	<878waazae7.fsf@benfinney.id.au>
	<20100302231909.6a5bad2d@geekmail.INVALID>
Message-ID: <4b8da06a$0$8783$c3e8da3@news.astraweb.com>

On Tue, 02 Mar 2010 23:19:09 +0100, Andreas Waldenburger wrote:

> We demand testable quality standards, but not of their code. We demand
> it of their software. We say *what* we want, they decide *how* they'll
> do it. Noncompliance will be fined, by a contractually agreed amount.
> Everything beyond that is micromanaging and detracts workforce from the
> stuff *we* have to do.

You specify the Functional Requirements but not the Design Requirements. 
Fair enough.

 
> We are in exactly the same kind of bond with a company that buys our
> system (and support). I have yet to see any one of them demand to see
> how we write our code. Why should they care? (Rhetorical question, I
> refuse to discuss this any further.)

It is true that most people don't care how code is written. But they 
*should* care, because how it is written directly impacts the quality of 
the code. Saying "I don't care how it is written" is precisely the same 
as saying "I don't care how reliable, secure or efficient the code is".

Of course people do this. People also inhale carcinogenic chemicals, vote 
bad laws into place, drive too fast, ingest noxious chemicals, and spend 
hours on Usenet debating the number of angels that can dance on the head 
of a pin.


>> I guess that when even the *customers* will resist implementing such
>> quality expectations, it's little surprise that the vendors continue to
>> push out such shoddy work on their customers.
>> 
> When I'm building bicycles I can go to the trouble of going by what
> method of galvanization my tires are produced. Or I save myself the
> trouble and just take the best offer and hold them responsible when they
> don't deliver on their promise. Both possible, both work, and both
> appropriate in certain situations.

Many years ago, I assisted a professional building architect design a 
software system for specifying the requirements of major architectural 
works such as bridges and high-rise buildings. They specify *everything*, 
right down to the type of sand used in the concrete and the grade of 
steel used for the frame. When using the wrong type of sand could mean 
that the bridge collapses in 35 years, you soon learn that, yes, you damn 
well better care.



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Tue Mar  2 18:36:21 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 02 Mar 2010 23:36:21 GMT
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
	<hmi5ns$57b$1@dough.gmane.org> <hmjena$n1p$1@dough.gmane.org>
	<mailman.128.1267552773.23598.python-list@python.org>
	<d166cf7a-4ce5-4857-9d24-e095f73c2e6b@p3g2000pra.googlegroups.com>
Message-ID: <4b8da0f4$0$8783$c3e8da3@news.astraweb.com>

On Tue, 02 Mar 2010 11:30:32 -0800, Patrick Maupin wrote:

> On Mar 2, 11:59?am, Terry Reedy <tjre... at udel.edu> wrote:
> 
>> To me, comparing object notation with programming language is not
>> helpful to the OP's purpose.
> 
> Yes, I agree, it was a distraction.  I fell into the trap of responding
> to the ludicrous claim that "if X is a superset of Y, then X cannot
> possibly look better than Y" (a claim made by multiple people all
> thinking it was clever) by showing that Y has other supersets that do in
> fact look better than Y.

It's not ludicrous.

You claim that:

(1) JSON is too hard to edit;

(2) RSON is a superset of JSON (the PEP even explicitly says "All valid 
UTF-8 encoded JSON files are also valid RSON files");

(3) which implies that all JSON files are valid RSON files.

If you reject the logical conclusion that RSON must therefore also be too 
hard to edit, then perhaps JSON isn't too hard to edit either.

You seem to be taking the position that if you start with a config file 
config.json, it is "too hard to edit", but then by renaming it to 
config.rson it magically becomes easier to edit. That *is* ludicrous.

Perhaps what you mean to say is that JSON *can be* (not is) too hard to 
edit, and RSON *can be* too hard to edit too, but RSON has additional 
benefits, including being easier to edit *sometimes*.

So far you have done (in my opinion) a really poor job of explaining what 
those benefits are. You've bad-mouthed existing config formats, then 
tried to convince us that RSON is almost exactly the same as one of those 
formats apart from a couple of trivial changes of spelling (True for 
true, etc.).

In my opinion, if you're going to get any traction with RSON, you need to 
demonstrate some examples of where JSON actually is hard to write, and 
show how RSON makes it easier. It's not good enough showing badly written 
JSON, it has to be examples that can't be written less badly given the 
constraints of JSON.


-- 
Steven


From ben+python at benfinney.id.au  Tue Mar  2 18:42:04 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 03 Mar 2010 10:42:04 +1100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
	<87eik3zmi8.fsf@benfinney.id.au>
	<20100302184056.743a71e7@geekmail.INVALID>
	<mailman.129.1267553139.23598.python-list@python.org>
	<20100302225156.67171851@geekmail.INVALID>
Message-ID: <877hpuxpdf.fsf@benfinney.id.au>

Andreas Waldenburger <usenot at geekmail.INVALID> writes:

> It works. They are supposed to make it work. And that's what they do.
> Whether or not they put their docstrings in the place they should does
> not change that their code works.

No-one has been denying that.

What the quality of their source code *does* affect, though, is its
maintainability over time ? especially in the inevitable event that the
relationship with you as their customer comes to an end.

The arguments I've seen here in this sub-thread have been in favour of
customers demanding that the code meets functional requirements *and*
soruce code quality requirements.

Just as customers should demand both that a building be built to do its
job well, *and* that its architectural plans meet measurable, testable
industry standards of quality for independent re-use at some
indeterminate later date.

If we don't demand such things as customers of program developers, we
deserve what programs we get.

-- 
 \           ?Special today: no ice cream.? ?mountain inn, Switzerland |
  `\                                                                   |
_o__)                                                                  |
Ben Finney


From marduk at python.net  Tue Mar  2 18:45:49 2010
From: marduk at python.net (Albert Hopkins)
Date: Tue, 02 Mar 2010 18:45:49 -0500
Subject: os.fdopen() issue in Python 3.1?
In-Reply-To: <4B8D4BB8.8020909@mrabarnett.plus.com>
References: <1267539898.477222.7.camel@necropolis>
	<4B8D4BB8.8020909@mrabarnett.plus.com>
Message-ID: <1267573549.495250.0.camel@centar>

On Tue, 2010-03-02 at 17:32 +0000, MRAB wrote:
> The documentation also mentions the 'pty' module. Have you tried that
> instead? 

I tried to use pty.fork() but it also produces the same error.

I also tried passing 'r', and 'rb' to fdopen() but it didn't make any
difference.

-a




From marduk at python.net  Tue Mar  2 18:59:00 2010
From: marduk at python.net (Albert Hopkins)
Date: Tue, 02 Mar 2010 18:59:00 -0500
Subject: os.fdopen() issue in Python 3.1?
In-Reply-To: <1267561347.4507.5.camel@necropolis>
References: <1267539898.477222.7.camel@necropolis>
	<hmjl6a$230$1@dough.gmane.org>  <1267561347.4507.5.camel@necropolis>
Message-ID: <1267574340.495250.4.camel@centar>

This appears to be Issue 5380[1] which is still open.  I've cc'ed myself
to that issue.

[1] http://bugs.python.org/issue5380





From marketing at rbcom.it  Tue Mar  2 19:08:19 2010
From: marketing at rbcom.it (RBCOM MEDIA GROUP)
Date: Wed, 3 Mar 2010 01:08:19 +0100
Subject: UNA VETRINA SUL MONDO
Message-ID: <00e99839$40240$efd90474441088@raffaele-6a745d>

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From news123 at free.fr  Tue Mar  2 19:30:26 2010
From: news123 at free.fr (News123)
Date: Wed, 03 Mar 2010 01:30:26 +0100
Subject: Image.frombuffer and warning
Message-ID: <4b8dada2$0$6285$426a74cc@news.free.fr>

Hi,

I am using the PIL function from_buffer in python 2.6.4

I am having the line
im2 = Image.frombuffer('L',(wx,wy),buf)


I receive the warning:
> ./pytest.py:63: RuntimeWarning: the frombuffer defaults may change in
a future release; for portability, change the call to read:
>   frombuffer(mode, size, data, 'raw', mode, 0, 1)
>   im2 = Image.frombuffer('L',(wx,wy),buf)


Naively I assumed, that changing my code to


im2 = Image.frombuffer('L',(wx,wy),buf,'raw','L',0,1)


should fix the issue:

However I receive exactly the same error as before.

What am I doing wrong?


thanks a lot in advance and bye


N


From no.email at nospam.invalid  Tue Mar  2 19:33:50 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Tue, 02 Mar 2010 16:33:50 -0800
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
	<hmi5ns$57b$1@dough.gmane.org> <hmjena$n1p$1@dough.gmane.org>
	<mailman.128.1267552773.23598.python-list@python.org>
	<d166cf7a-4ce5-4857-9d24-e095f73c2e6b@p3g2000pra.googlegroups.com>
	<4b8da0f4$0$8783$c3e8da3@news.astraweb.com>
Message-ID: <7x4okyb5w1.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
> (3) which implies that all JSON files are valid RSON files.
>
> If you reject the logical conclusion that RSON must therefore also be too 
> hard to edit, then perhaps JSON isn't too hard to edit either.

I would say that JSON is hard to edit because, among other things, it
has no comment syntax.  It's quite difficult to maintain a hand-edited
JSON file, or figure out what to edit into it, if it can't have any
comments in it describing what it's doing.  JSON is a serialization
format for machine to machine communication, not intended for hand
editing.  Simply adding a comment syntax to JSON would go a long way
towards making it easier to edit.


From news123 at free.fr  Tue Mar  2 19:38:21 2010
From: news123 at free.fr (News123)
Date: Wed, 03 Mar 2010 01:38:21 +0100
Subject: python 2.6: how to modify a PIL image from C without copying forth
	and back
Message-ID: <4b8daf7d$0$2868$426a74cc@news.free.fr>

Hi,

I created a grayscale image with PIL.

Now I would like to write a C function, which reads a;most all pixels
and will modify a few of them.


My current approach is:
- transform the image to a string()
- create a byte array huge enough to contain the resulting image
- call my c_function, which copies over the entire image in order
   to modify a few pixels
How can I achieve this with the least amount of copies?


########## Python code snippet ################

im = Image.open('grayscalefile_onebyteperpixel')
wx,wy = im.size

# create a string in order to pass it to my function
# I'm afraid this involves copying so  want to get rid of it
im_as_string = im.tostring()

# create a byte array in order to store my result
new_img_array = array.array('B', [0]*(wx*wy) )


# my function which should just change some pixels has
# to copy all unmodified pixels
my_extension.my_func(wx,wy,im_as_string,new_img_array)


im = Image.frombuffer('L',(wx,wy),new_img_array)
show(im2)

############ C wrapper code snippet ###############

    int wx,wy;
    Py_buffer img;
    Py_buffer new_img;
    Py_buffer table;
    unsigned char *img_ptr;
    unsigned char *new_img_ptr;

    int ok = PyArg_ParseTuple(args,
        "iis*w*",&wx,&wy,&img,&new_img);
    img_ptr = (unsigned char *) img.buf;
    new_img_ptr = (unsigned char *) new_img.buf;
    my_func(wx,wy,img_ptr,new_img_ptr);


Thanks in advance for any suggestions to make this more efficient.


bye


N



From python at mrabarnett.plus.com  Tue Mar  2 19:53:22 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 03 Mar 2010 00:53:22 +0000
Subject: Multiprocessing problem
In-Reply-To: <4B8D7C23.7050905@sidefx.com>
References: <4B8D7C23.7050905@sidefx.com>
Message-ID: <4B8DB302.1010102@mrabarnett.plus.com>

Matt Chaput wrote:
> Hi,
> 
> I'm having a problem with the multiprocessing package.
> 
> I'm trying to use a simple pattern where a supervisor object starts a 
> bunch of worker processes, instantiating them with two queues (a job 
> queue for tasks to complete and an results queue for the results). The 
> supervisor puts all the jobs in the "job" queue, then join()s the 
> workers, and then pulls all the completed results off the "results" queue.
> 
> (I don't think I can just use something like Pool.imap_unordered for 
> this because the workers need to be objects with state.)
> 
> Here's a simplified example:
> 
> http://pastie.org/850512
> 
> The problem is that seemingly randomly, but almost always, the worker 
> processes will deadlock at some point and stop working before they 
> complete. This will leave the whole program stalled forever. This seems 
> more likely the more work each worker does (to the point where adding 
> the time.sleep(0.01) as seen in the example code above guarantees it). 
> The problem seems to occur on both Windows and Mac OS X.
> 
> I've tried many random variations of the code (e.g. using JoinableQueue, 
> calling cancel_join_thread() on one or both queues even though I have no 
> idea what it does, etc.) but keep having the problem.
> 
> Am I just using multiprocessing wrong? Is this a bug? Any advice?
> 
There's a difference between multithreading and multiprocessing.

In multithreading the threads share the same address space, so objects
can be passed between the threads simply by passing references to those
objects.

In multiprocessing, however, the process don't share an address space,
so the objects themselves need to be transferred between the processes
via pipes, but the pipes have a limited capacity.

If the main process doesn't get the results from the queue until the
worker processes terminate, and the worker processes don't terminate
until they've put their results in the queue, and the pipe consequently
fills up, then deadlock can result.


From python at mrabarnett.plus.com  Tue Mar  2 20:00:11 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 03 Mar 2010 01:00:11 +0000
Subject: Queue peek?
In-Reply-To: <1267567723.4101.28.camel@localhost.localdomain>
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>	<58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>	<mailman.138.1267559095.23598.python-list@python.org>	<hmjqkr$r46$1@news.eternal-september.org>	<eae285401003021233i7a62771h590a557341f10ca4@mail.gmail.com>	<hmk1er$mlb$1@dough.gmane.org>
	<1267567723.4101.28.camel@localhost.localdomain>
Message-ID: <4B8DB49B.8070008@mrabarnett.plus.com>

John Krukoff wrote:
> On Tue, 2010-03-02 at 22:54 +0100, mk wrote:
> <snip>
>> No need to use synchro primitives like locks?
>>
>> I know that it may work, but that strikes me as somehow wrong... I'm 
>> used to using things like Lock().acquire() and Lock().release() when 
>> accessing shared data structures, whatever they are.
> <snip>
> 
> This is one of those places where the GIL is a good thing, and makes
> your life simpler. You could consider it that the interpreter does the
> locking for you for such primitive operations, if you like.

I suppose it depends on the complexity of the data structure. A dict's
methods are threadsafe, for example, but if you have a data structure
where access leads to multiple method calls then collectively they need
a lock.


From matt at whoosh.ca  Tue Mar  2 20:07:49 2010
From: matt at whoosh.ca (Matt Chaput)
Date: Tue, 02 Mar 2010 20:07:49 -0500
Subject: Multiprocessing problem
In-Reply-To: <4B8DB302.1010102@mrabarnett.plus.com>
References: <4B8D7C23.7050905@sidefx.com>
	<4B8DB302.1010102@mrabarnett.plus.com>
Message-ID: <4B8DB665.2080602@whoosh.ca>

> If the main process doesn't get the results from the queue until the
> worker processes terminate, and the worker processes don't terminate
> until they've put their results in the queue, and the pipe consequently
> fills up, then deadlock can result.

The queue never fills up... on platforms with qsize() I can see this. I 
remove items from the results queue as I add to the job queue, and if I 
add timeouts everywhere the workers never raise Empty and the supervisor 
never raises Full. They just deadlock.

I've rewritten the code so the worker threads don't push information 
back while they run, they just write to a temporary file which the 
supervisor can read, which avoids the issue. But if anyone can tell me 
what I was doing wrong for future reference, I'd greatly appreciate it.

Thanks,

Matt


From jcb at iteris.com  Tue Mar  2 20:45:31 2010
From: jcb at iteris.com (Metalone)
Date: Tue, 2 Mar 2010 17:45:31 -0800 (PST)
Subject: Multiprocessing.Pipe is not concurrently bi-directional (design 
	flaw?)
Message-ID: <7dbf688d-a86f-4e8d-a183-59673ed28f29@m35g2000prh.googlegroups.com>

I wanted to use Multiprocessing.Pipe and Multiprocessing.Process to
peform Actor style communication.
However, I just can't get what I need done, and I think it is due to
inherit problems with the design of Pipe.

If I have a process like this
def process1(conn):
    while True:
        msg = conn.recv()
        if msg == 'go':
            res = go()           # this is a long running function
            conn.send(res)   # send result back to caller
        elif msg == 'stop':
            stop() # this is intended to stop the go() function, for
example using deciding to abort operation.

In this code the 'stop' message cannot be received, because the code
is in the long running go() function.
So lets change it.

def process1(conn):
    while True:
        msg = conn.recv()
        if msg == 'go':
            t = threading.Thread(target=go, args=(conn,))
            t.start()
        elif msg == 'stop':
            stop() # this is intended to stop the go() function.

Now the thread-1 is waiting on the blocking recv().
If the go() function completes on thread-2, it wants to send its
result via the connection object, but it can't because
the connection is in use.

Trying to work around this gets complicated.
For example, using a second process and a second connection object to
read the 'stop' message, and then changing a shared memory flag to
stop the go() function.

Pipes not being concurrently bi-directional appears to be a design
flaw to me.
pyCSP appears to be an interesting approach, but it does not support
communication across O.S. processes on Win32.


From jcb at iteris.com  Tue Mar  2 21:11:27 2010
From: jcb at iteris.com (Metalone)
Date: Tue, 2 Mar 2010 18:11:27 -0800 (PST)
Subject: Multiprocessing.Pipe is not concurrently bi-directional (design 
	flaw?)
References: <7dbf688d-a86f-4e8d-a183-59673ed28f29@m35g2000prh.googlegroups.com>
Message-ID: <8f0cf159-bfb4-4def-82c7-9a99bd9cbebe@z10g2000prh.googlegroups.com>

Well, I just realized that I could use a separate pipe to send the
result back.  This might work ok.


From pmaupin at gmail.com  Tue Mar  2 21:26:38 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Tue, 2 Mar 2010 18:26:38 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
	<hmi5ns$57b$1@dough.gmane.org> <hmjena$n1p$1@dough.gmane.org> 
	<mailman.128.1267552773.23598.python-list@python.org>
	<d166cf7a-4ce5-4857-9d24-e095f73c2e6b@p3g2000pra.googlegroups.com>
	<4b8da0f4$0$8783$c3e8da3@news.astraweb.com>
Message-ID: <e055ea11-07b4-4f4a-9d45-68ed12473005@m37g2000yqf.googlegroups.com>

On Mar 2, 5:36?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> You seem to be taking the position that if you start with a config file
> config.json, it is "too hard to edit", but then by renaming it to
> config.rson it magically becomes easier to edit. That *is* ludicrous.

No, but that seems to be the position you keep trying to ascribe to
me: "Wait a minute... if JSON is too hard to edit, and RSON is a
*superset* of JSON, that means by definition every JSON file is also a
valid RSON file.  Since JSON is too hard to manually edit, so is
RSON."

> Perhaps what you mean to say is that JSON *can be* (not is) too hard to
> edit, and RSON *can be* too hard to edit too, but RSON has additional
> benefits, including being easier to edit *sometimes*.

I have said as much, in multiple prior postings on this thread, if you
care to look.

> So far you have done (in my opinion) a really poor job of explaining what
> those benefits are.

That's certainly a valid complaint, and I can certainly believe that's
true (and I'm going to be working on the doc some more), but instead
of making this complaint, you made the (still silly IMO) assertion
that a superset has to be as unreadable as the base set.

> You've bad-mouthed existing config formats, then
> tried to convince us that RSON is almost exactly the same as one of those formats apart from a couple of trivial changes of spelling (True for true, etc.).

This is conflating two different issues.  In a lame attempt to show
the silliness of the argument that the superset must be as bad as the
subset, I was trying to explain that, if you make a very few changes,
Python is a superset of JSON.  However, my lame attempt at this was
obviously as poorly thought out as some of the rest of my words,
because it started an additional discussion that wasn't really germane
to the real issues about configuration files.

> In my opinion, if you're going to get any traction with RSON, you need to
> demonstrate some examples of where JSON actually is hard to write, and
> show how RSON makes it easier. It's not good enough showing badly written
> JSON, it has to be examples that can't be written less badly given the
> constraints of JSON.

Agreed, and I will be working on that.

Best regards,
Pat


From python at mrabarnett.plus.com  Tue Mar  2 21:37:23 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 03 Mar 2010 02:37:23 +0000
Subject: Multiprocessing.Pipe is not concurrently bi-directional (design
	flaw?)
In-Reply-To: <8f0cf159-bfb4-4def-82c7-9a99bd9cbebe@z10g2000prh.googlegroups.com>
References: <7dbf688d-a86f-4e8d-a183-59673ed28f29@m35g2000prh.googlegroups.com>
	<8f0cf159-bfb4-4def-82c7-9a99bd9cbebe@z10g2000prh.googlegroups.com>
Message-ID: <4B8DCB63.80201@mrabarnett.plus.com>

Metalone wrote:
> Well, I just realized that I could use a separate pipe to send the
> result back.  This might work ok.

Or you could call .poll on the pipe and sleep if there's no input yet.


From victor.stinner at haypocalc.com  Tue Mar  2 21:37:44 2010
From: victor.stinner at haypocalc.com (Victor Stinner)
Date: Wed, 3 Mar 2010 03:37:44 +0100
Subject: Challenge: escape from the pysandbox
In-Reply-To: <fbe2e2101002281440n419fbcb1v2cf3922db1cef6a4@mail.gmail.com>
References: <201002261329.33740.victor.stinner@haypocalc.com>
	<hmeamq$a0$1@panix5.panix.com>
	<fbe2e2101002281440n419fbcb1v2cf3922db1cef6a4@mail.gmail.com>
Message-ID: <201003030337.44915.victor.stinner@haypocalc.com>

Le dimanche 28 f?vrier 2010 23:40:59, Daniel Fetchinson a ?crit :
> >>I guess they also have some kind of a sandbox if they let people run
> >>python on their machines, I'm not sure if it's open source though.
> >
> > Thing is, I'm sure that Google uses a critical backstop to any
> > Python-based sandbox: something like a chroot jail.  The Python sandbox
> > is mostly there to inform you about what you can and can't do; the real
> > security is provided by the OS.
> 
> I see, makes perfect sense. This then raises the question whether it's
> important to have a 100% fool proof python sandbox without help from
> the OS, or this goal is not only too ambitious but also not really a
> useful one. 

This is just impossible :-) PHP tried that but it's too hard to write an 
exhaustive blacklist because too much code have to be modified. If you require 
a 100% fool proof sandbox, you have to use a sandbox between the Python 
process and the OS (and not inside the Python process).

> One aspect might be that one might want to have a platform
> independent way of sandboxing, perhaps.

The problem have to be splitted in two parts: protect access to OS resources 
(files, network, etc.) and protect access to Python objects (eg. create a read 
only view of objects injected to the sandbox).

An "OS sandbox" can not protect objects inside the Python object. And 
pysandbox cannot protect all access to OS resources (but I try to do that 
:-)).

pysandbox is a possible solution to the second problem: control Python object 
space.
-- 
Victor Stinner
http://www.haypocalc.com/


From victor.stinner at haypocalc.com  Tue Mar  2 21:42:51 2010
From: victor.stinner at haypocalc.com (Victor Stinner)
Date: Wed, 3 Mar 2010 03:42:51 +0100
Subject: Challenge: escape from the pysandbox
In-Reply-To: <201002281743.07452.victor.stinner@haypocalc.com>
References: <201002261329.33740.victor.stinner@haypocalc.com>
	<fbe2e2101002270937n79ed285bh1715671e3c5a2958@mail.gmail.com>
	<201002281743.07452.victor.stinner@haypocalc.com>
Message-ID: <201003030342.51801.victor.stinner@haypocalc.com>

Le dimanche 28 f?vrier 2010 17:43:07, Victor Stinner a ?crit :
> Yes, Google AppEngine has its Python sandbox and the source code is
>  available online. I don't know the license. I found 7 vulnerabilities in 1
>  hour :-) I contacted Google security team. (...) There are other
>  differences, but I prefer to wait for the answer from
>  Google before telling you more :)

Google answered me. I misunderstood AppEngine sandbox. It's not a Python 
sandbox.

AppEngine sandbox is just a tool helping developers to test programs without 
the "real" (OS) sandbox. Their Python sandbox *emulates* the real sandbox, and 
so it's completly different to pysandbox.

-- 
Victor Stinner
http://www.haypocalc.com/


From alfps at start.no  Tue Mar  2 21:54:20 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 03 Mar 2010 03:54:20 +0100
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <e055ea11-07b4-4f4a-9d45-68ed12473005@m37g2000yqf.googlegroups.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
	<hmi5ns$57b$1@dough.gmane.org> <hmjena$n1p$1@dough.gmane.org>
	<mailman.128.1267552773.23598.python-list@python.org>
	<d166cf7a-4ce5-4857-9d24-e095f73c2e6b@p3g2000pra.googlegroups.com>
	<4b8da0f4$0$8783$c3e8da3@news.astraweb.com>
	<e055ea11-07b4-4f4a-9d45-68ed12473005@m37g2000yqf.googlegroups.com>
Message-ID: <hmkj0v$n0l$1@news.eternal-september.org>

* Patrick Maupin:
> On Mar 2, 5:36 pm, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
>> You seem to be taking the position that if you start with a config file
>> config.json, it is "too hard to edit", but then by renaming it to
>> config.rson it magically becomes easier to edit. That *is* ludicrous.
> 
> No, but that seems to be the position you keep trying to ascribe to
> me: "Wait a minute... if JSON is too hard to edit, and RSON is a
> *superset* of JSON, that means by definition every JSON file is also a
> valid RSON file.  Since JSON is too hard to manually edit, so is
> RSON."

Just a heads-up: IME it's next to impossible (maybe actually impossible) to 
convince Steven that your position is not the one he ascribes to you. At least 
not without an extremely lengthy debate veering off on multiple similar tangents 
plus some that one would never dream of. So I'd give up on that.

Anyway, I agree with the sentiments expressed by many in this thread that what's 
important is the established "eco-culture", not the editability.

Thus, even though XML isn't all that editable it's what I'd choose by default 
for rich configuration information, regardless of whether some simpler to edit 
alternative existed. Simply because there are so many XML tools out there, and 
people know about XML. It's like MS-DOS once became popular in spite of being 
extremely technically imperfect for its purpose, and then Windows... :-)


Cheers,

- Alf


From ftp-wg-owner at hethmon.com  Tue Mar  2 21:58:11 2010
From: ftp-wg-owner at hethmon.com (ftp-wg-owner at hethmon.com)
Date: Wed, 3 Mar 2010 09:58:11 +0700
Subject: Xgyxkcxxpy
Message-ID: <20100303025835.EE602EE9AB@mail.python.org>

Dear user of python.org,

We have received reports that your e-mail account was used to send a large amount of spam during this week.
Most likely your computer was compromised and now contains a trojaned proxy server.

We recommend you to follow instruction in order to keep your computer safe.

Best wishes,
python.org technical support team.

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From barry at python.org  Tue Mar  2 22:17:44 2010
From: barry at python.org (Barry Warsaw)
Date: Tue, 2 Mar 2010 22:17:44 -0500
Subject: Python 2.6.5 release candidate 1 now available
Message-ID: <20100302221744.7ee4d3dd@heresy.wooz.org>

Hello everyone,

The source tarballs and Windows installer for Python 2.6.5 release candidate 1
are now available:

http://www.python.org/download/releases/2.6.5/

Please download them, install them, and try to use them with your favorite
projects and environments.  If no regressions are found, we will do the final
release on Monday March 15, 2010.  Please test the release candidate as
much as possible in the meantime, and help make 2.6.5 a rock solid release!

Thanks,
-Barry

P.S. The Mac installer will hopefully be available soon.
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From max at alcyone.com  Tue Mar  2 22:20:34 2010
From: max at alcyone.com (Erik Max Francis)
Date: Tue, 02 Mar 2010 19:20:34 -0800
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <e055ea11-07b4-4f4a-9d45-68ed12473005@m37g2000yqf.googlegroups.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
	<hmi5ns$57b$1@dough.gmane.org> <hmjena$n1p$1@dough.gmane.org>
	<mailman.128.1267552773.23598.python-list@python.org>
	<d166cf7a-4ce5-4857-9d24-e095f73c2e6b@p3g2000pra.googlegroups.com>
	<4b8da0f4$0$8783$c3e8da3@news.astraweb.com>
	<e055ea11-07b4-4f4a-9d45-68ed12473005@m37g2000yqf.googlegroups.com>
Message-ID: <FqqdnYyyH84fSBDWnZ2dnUVZ_jqdnZ2d@giganews.com>

Patrick Maupin wrote:
> On Mar 2, 5:36 pm, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
>> You seem to be taking the position that if you start with a config file
>> config.json, it is "too hard to edit", but then by renaming it to
>> config.rson it magically becomes easier to edit. That *is* ludicrous.
> 
> No, but that seems to be the position you keep trying to ascribe to
> me: "Wait a minute... if JSON is too hard to edit, and RSON is a
> *superset* of JSON, that means by definition every JSON file is also a
> valid RSON file.  Since JSON is too hard to manually edit, so is
> RSON."

Huh?  That's the argument being used against you, not the argument being 
ascribed to you.  You're getting confused about something, somewhere.

-- 
Erik Max Francis && max at alcyone.com && http://www.alcyone.com/max/
  San Jose, CA, USA && 37 18 N 121 57 W && AIM/Y!M/Skype erikmaxfrancis
   I wonder if heaven got a ghetto
    -- Tupac Shakur


From prakash.stack at gmail.com  Tue Mar  2 22:25:32 2010
From: prakash.stack at gmail.com (prakash jp)
Date: Wed, 3 Mar 2010 08:55:32 +0530
Subject: How to use python to register a service (an existing .exe file)
In-Reply-To: <4b79e28c$0$4610$426a74cc@news.free.fr>
References: <4b79e28c$0$4610$426a74cc@news.free.fr>
Message-ID: <805f59d51003021925s27c8c489o9a25c23caef22fda@mail.gmail.com>

Hi all,

plz find the attachment, thats how u register services Pythonically:


Regards
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From pmaupin at gmail.com  Tue Mar  2 22:35:20 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Tue, 2 Mar 2010 19:35:20 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
	<hmi5ns$57b$1@dough.gmane.org> <hmjena$n1p$1@dough.gmane.org> 
	<mailman.128.1267552773.23598.python-list@python.org>
	<d166cf7a-4ce5-4857-9d24-e095f73c2e6b@p3g2000pra.googlegroups.com>
	<4b8da0f4$0$8783$c3e8da3@news.astraweb.com>
	<e055ea11-07b4-4f4a-9d45-68ed12473005@m37g2000yqf.googlegroups.com>
	<FqqdnYyyH84fSBDWnZ2dnUVZ_jqdnZ2d@giganews.com>
Message-ID: <9f3569ec-aaef-451a-a275-2459e693927f@g26g2000yqn.googlegroups.com>

On Mar 2, 9:20?pm, Erik Max Francis <m... at alcyone.com> wrote:
> Patrick Maupin wrote:
> > On Mar 2, 5:36 pm, Steven D'Aprano <st... at REMOVE-THIS-
> > cybersource.com.au> wrote:
> >> You seem to be taking the position that if you start with a config file
> >> config.json, it is "too hard to edit", but then by renaming it to
> >> config.rson it magically becomes easier to edit. That *is* ludicrous.
>
> > No, but that seems to be the position you keep trying to ascribe to
> > me: "Wait a minute... if JSON is too hard to edit, and RSON is a
> > *superset* of JSON, that means by definition every JSON file is also a
> > valid RSON file. ?Since JSON is too hard to manually edit, so is
> > RSON."
>
> Huh? ?That's the argument being used against you, not the argument being
> ascribed to you. ?You're getting confused about something, somewhere.
>
> --
> Erik Max Francis && m... at alcyone.com &&http://www.alcyone.com/max/
> ? San Jose, CA, USA && 37 18 N 121 57 W && AIM/Y!M/Skype erikmaxfrancis
> ? ?I wonder if heaven got a ghetto
> ? ? -- Tupac Shakur

Yes, it is very confusing.  Steven used that purported argument
against me, and then since I disagreed with it, it apparently meant
that I was arguing that changing the file extension type (which I've
never even proposed or discussed, btw) from json to rson somehow
magically makes a preexisting file all better.  I have a headache now,
and it will only get worse, so that's really all I have left to say
about this issue.

Best regards,
Pat


From prakash.stack at gmail.com  Tue Mar  2 22:36:42 2010
From: prakash.stack at gmail.com (prakash jp)
Date: Wed, 3 Mar 2010 09:06:42 +0530
Subject: How to use python to register a service (an existing .exe file)
In-Reply-To: <881a0df5-872f-4c19-a989-fe3ffe775655@k2g2000pro.googlegroups.com>
References: <4b79e28c$0$4610$426a74cc@news.free.fr>
	<881a0df5-872f-4c19-a989-fe3ffe775655@k2g2000pro.googlegroups.com>
Message-ID: <805f59d51003021936y53af0759q663fbd131c7fa432@mail.gmail.com>

Code of SmallestService.py is at:

http://book.opensourceproject.org.cn/lamp/python/pythonwin/

Regards
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From lie.1296 at gmail.com  Tue Mar  2 22:51:52 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Wed, 03 Mar 2010 14:51:52 +1100
Subject: Is this secure?
In-Reply-To: <mailman.187.1267039205.4577.python-list@python.org>
References: <mailman.110.1266935711.4577.python-list@python.org>	<7xtyt72200.fsf@ruckus.brouhaha.com>	<d8a401bf-6dfa-4e41-bea0-8cbf12f8d6e0@o3g2000vbo.googlegroups.com>	<7x3a0r8hyr.fsf@ruckus.brouhaha.com>	<mailman.169.1267032213.4577.python-list@python.org>	<hm3p7l$hr$1@news.urz.uni-heidelberg.de>	<hm3rgu$kvd$1@dough.gmane.org>	<hm3t1f$qbj$1@dough.gmane.org>
	<mailman.187.1267039205.4577.python-list@python.org>
Message-ID: <4b8ddcf6$1@dnews.tpgi.com.au>

On 02/25/2010 06:16 AM, mk wrote:
> On 2010-02-24 20:01, Robert Kern wrote:
>> I will repeat my advice to just use random.SystemRandom.choice() instead
>> of trying to interpret the bytes from /dev/urandom directly.
> 
> Out of curiosity:
> 
> def gen_rand_string(length):
>     prng = random.SystemRandom()
>     chars = []
>     for i in range(length):
>         chars.append(prng.choice('abcdefghijklmnopqrstuvwxyz'))
>     return ''.join(chars)
> 
> if __name__ == "__main__":
>     chardict = {}
>     for i in range(10000):
> ##        w = gen_rand_word(10)
>         w = gen_rand_string(10)
>         count_chars(chardict, w)
>     counts = list(chardict.items())
>     counts.sort(key = operator.itemgetter(1), reverse = True)
>     for char, count in counts:
>         print char, count
> 
> 
> s 3966
> d 3912
> g 3909
> h 3905
> a 3901
> u 3900
> q 3891
> m 3888
> k 3884
> b 3878
> x 3875
> v 3867
> w 3864
> y 3851
> l 3825
> z 3821
> c 3819
> e 3819
> r 3816
> n 3808
> o 3797
> f 3795
> t 3784
> p 3765
> j 3730
> i 3704
> 
> Better, although still not perfect.
> 

I give you this:

I give you this:

import itertools
def gen():
    valid_chars = 'abcdefghijklmnopqrstuvwxyz'
    for char in itertools.repeat(valid_chars):
        yield char

gen = gen()
def gen_rand_string(length):
    chars = (next(gen) for i in range(length))
    return ''.join(chars)

since it gives me a perfect distribution of letters, it must be a very
secure random password generation scheme.


From lie.1296 at gmail.com  Tue Mar  2 22:59:01 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Wed, 03 Mar 2010 14:59:01 +1100
Subject: cpan for python?
In-Reply-To: <2010030214473616807-tomfsessile@gmailcom>
References: <mailman.20.1267367545.23598.python-list@python.org>
	<hmjv4b$mqk$1@reader1.panix.com>
	<2010030214473616807-tomfsessile@gmailcom>
Message-ID: <4b8ddea4$1@dnews.tpgi.com.au>

On 03/03/2010 09:47 AM, TomF wrote:
> On 2010-03-02 13:14:50 -0800, R Fritz <rfritz at u.washington.edu> said:
> 
>> On 2010-02-28 06:31:56 -0800, ssteinerX at gmail.com said:
>>>
>>> On Feb 28, 2010, at 9:28 AM, Someone Something wrote:
>>>
>>>> Is there something like cpan for python? I like python's syntax, but
>>>> Iuse perl because of cpan and the tremendous modules that it has.  --
>>>
>>> Please search the mailing list archives.
>>>
>>> This subject has been discussed to absolute death.
>>
>> But somehow the question is not in the FAQ, though the answer is. See:
>>  
>> <http://www.python.org/doc/faq/library/#how-do-i-find-a-module-or-application-to-perform-task-x>
>>
> 
> There
> is also a program called cpan, distributed with Perl.  It is used for
> searching, downloading, installing and testing modules from the CPAN
> repository.  It's far more extensive than setuptools.  AFAIK the python
> community has developed nothing like it.

python have easy_install



From john at castleamber.com  Tue Mar  2 23:58:47 2010
From: john at castleamber.com (John Bokma)
Date: Tue, 02 Mar 2010 22:58:47 -0600
Subject: cpan for python?
References: <mailman.20.1267367545.23598.python-list@python.org>
	<hmjv4b$mqk$1@reader1.panix.com>
	<2010030214473616807-tomfsessile@gmailcom>
	<4b8ddea4$1@dnews.tpgi.com.au>
Message-ID: <87ljea9f20.fsf@castleamber.com>

Lie Ryan <lie.1296 at gmail.com> writes:

> On 03/03/2010 09:47 AM, TomF wrote:

[..]
 
>> There
>> is also a program called cpan, distributed with Perl.  It is used for
>> searching, downloading, installing and testing modules from the CPAN
>> repository.  It's far more extensive than setuptools.  AFAIK the python
>> community has developed nothing like it.
>
> python have easy_install


How easy is it to /remove/ something? ;-) (Last time I checked I read
something like "manually remove the .egg"...

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar  3 00:00:37 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 03 Mar 2010 05:00:37 GMT
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
	<hmi5ns$57b$1@dough.gmane.org> <hmjena$n1p$1@dough.gmane.org>
	<mailman.128.1267552773.23598.python-list@python.org>
	<d166cf7a-4ce5-4857-9d24-e095f73c2e6b@p3g2000pra.googlegroups.com>
	<4b8da0f4$0$8783$c3e8da3@news.astraweb.com>
	<e055ea11-07b4-4f4a-9d45-68ed12473005@m37g2000yqf.googlegroups.com>
	<FqqdnYyyH84fSBDWnZ2dnUVZ_jqdnZ2d@giganews.com>
	<9f3569ec-aaef-451a-a275-2459e693927f@g26g2000yqn.googlegroups.com>
Message-ID: <pan.2010.03.03.05.00.38@REMOVE.THIS.cybersource.com.au>

On Tue, 02 Mar 2010 19:35:20 -0800, Patrick Maupin wrote:

> Yes, it is very confusing.  Steven used that purported argument against
> me, and then since I disagreed with it, it apparently meant that I was
> arguing that changing the file extension type (which I've never even
> proposed or discussed, btw) from json to rson 

My argument is *figurative*, not literal.


> somehow magically makes a preexisting file all better.

You might not have intended that ludicrous conclusion, but it was implied 
by some of your posts, particularly the early ones. Of course I don't 
think that you *actually* believe the conclusion.

I believe that, whatever the real or imagined benefit of RSON over JSON, 
in this thread you have attempted to over-sell RSON while giving 
relatively little justification for it.

I wish you every success in your project, but think that it is off-topic 
for a Python discussion group.




-- 
Steven


From ben+python at benfinney.id.au  Wed Mar  3 00:17:16 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Wed, 03 Mar 2010 16:17:16 +1100
Subject: cpan for python?
References: <mailman.20.1267367545.23598.python-list@python.org>
	<hmjv4b$mqk$1@reader1.panix.com>
	<2010030214473616807-tomfsessile@gmailcom>
	<4b8ddea4$1@dnews.tpgi.com.au>
Message-ID: <873a0ix9ur.fsf@benfinney.id.au>

Lie Ryan <lie.1296 at gmail.com> writes:

> On 03/03/2010 09:47 AM, TomF wrote:
> > There is also a program called cpan, distributed with Perl. It is
> > used for searching, downloading, installing and testing modules from
> > the CPAN repository. It's far more extensive than setuptools. AFAIK
> > the python community has developed nothing like it.
>
> python have easy_install

Indeed. And that program is nothing like the Perl ?cpan? program.

-- 
 \           ?Value your freedom or you will lose it, teaches history. |
  `\     ?Don't bother us with politics,? respond those who don't want |
_o__)                               to learn.? ?Richard Stallman, 2002 |
Ben Finney


From greg.ewing at canterbury.ac.nz  Wed Mar  3 00:18:28 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Wed, 03 Mar 2010 18:18:28 +1300
Subject: Docstrings considered too complicated
In-Reply-To: <mailman.59.1267456634.23598.python-list@python.org>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>
	<4B8B9845.70604@sequans.com>
	<mailman.59.1267456634.23598.python-list@python.org>
Message-ID: <7v695nFa0fU1@mid.individual.net>

MRAB wrote:

> BTW, the first programming I did was in hexadecimal (C4xx was "LDI xx").

Hey, a SC/MP! That was my first programming language,
too. What sort of machine was it in?

-- 
Greg


From greg.ewing at canterbury.ac.nz  Wed Mar  3 00:30:00 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Wed, 03 Mar 2010 18:30:00 +1300
Subject: Docstrings considered too complicated
In-Reply-To: <hmk60h$nce$1@reader1.panix.com>
References: <20100224212303.242222c6@geekmail.INVALID>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <kyoevn.k63@spenarnc.xs4all.nl>
	<hmk60h$nce$1@reader1.panix.com>
Message-ID: <7v69rcFcmeU1@mid.individual.net>

Grant Edwards wrote:

> Just a mediocre copy of the CP/M filesystem, which was in turn
> copied from DEC's RSTS or RSX.

It was actually an improvement over CP/M's file
system. CP/M didn't have hierarchical directories
or timestamps and recorded file sizes in 128-byte
blocks rather than bytes.

-- 
Greg


From max at alcyone.com  Wed Mar  3 00:36:42 2010
From: max at alcyone.com (Erik Max Francis)
Date: Tue, 02 Mar 2010 21:36:42 -0800
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <9f3569ec-aaef-451a-a275-2459e693927f@g26g2000yqn.googlegroups.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<scudnVc0Fq3ryRHWnZ2dnUVZ_t-dnZ2d@giganews.com>
	<4eb68968-ba7e-44ce-86ec-46dfa6ab1b24@z11g2000yqz.googlegroups.com>
	<hmi5ns$57b$1@dough.gmane.org> <hmjena$n1p$1@dough.gmane.org>
	<mailman.128.1267552773.23598.python-list@python.org>
	<d166cf7a-4ce5-4857-9d24-e095f73c2e6b@p3g2000pra.googlegroups.com>
	<4b8da0f4$0$8783$c3e8da3@news.astraweb.com>
	<e055ea11-07b4-4f4a-9d45-68ed12473005@m37g2000yqf.googlegroups.com>
	<FqqdnYyyH84fSBDWnZ2dnUVZ_jqdnZ2d@giganews.com>
	<9f3569ec-aaef-451a-a275-2459e693927f@g26g2000yqn.googlegroups.com>
Message-ID: <__adnWP-2__2aBDWnZ2dnUVZ_h2dnZ2d@giganews.com>

Patrick Maupin wrote:
> On Mar 2, 9:20 pm, Erik Max Francis <m... at alcyone.com> wrote:
>> Patrick Maupin wrote:
>>> On Mar 2, 5:36 pm, Steven D'Aprano <st... at REMOVE-THIS-
>>> cybersource.com.au> wrote:
>>>> You seem to be taking the position that if you start with a config file
>>>> config.json, it is "too hard to edit", but then by renaming it to
>>>> config.rson it magically becomes easier to edit. That *is* ludicrous.
>>> No, but that seems to be the position you keep trying to ascribe to
>>> me: "Wait a minute... if JSON is too hard to edit, and RSON is a
>>> *superset* of JSON, that means by definition every JSON file is also a
>>> valid RSON file.  Since JSON is too hard to manually edit, so is
>>> RSON."
>> Huh?  That's the argument being used against you, not the argument being
>> ascribed to you.  You're getting confused about something, somewhere.
> 
> Yes, it is very confusing.  Steven used that purported argument
> against me, and then since I disagreed with it, it apparently meant
> that I was arguing that changing the file extension type (which I've
> never even proposed or discussed, btw) from json to rson somehow
> magically makes a preexisting file all better.

No, that was not the point he was making.  You should reread more 
carefully (and be aware of sarcasm).

-- 
Erik Max Francis && max at alcyone.com && http://www.alcyone.com/max/
  San Jose, CA, USA && 37 18 N 121 57 W && AIM/Y!M/Skype erikmaxfrancis
   Perfect situations must go wrong
    -- Florence, _Chess_


From greg.ewing at canterbury.ac.nz  Wed Mar  3 00:40:00 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Wed, 03 Mar 2010 18:40:00 +1300
Subject: Docstrings considered too complicated
In-Reply-To: <877hpuxpdf.fsf@benfinney.id.au>
References: <20100224212303.242222c6@geekmail.INVALID>	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>	<20100227191040.6c77f2d8@geekmail.INVALID>	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>	<20100301140943.4edca16b@geekmail.INVALID>	<4b8be8f7$1@dnews.tpgi.com.au>	<20100301182255.3de59bc6@geekmail.INVALID>	<mailman.66.1267465347.23598.python-list@python.org>	<20100301212954.7aa0b99d@geekmail.INVALID>	<87eik3zmi8.fsf@benfinney.id.au>	<20100302184056.743a71e7@geekmail.INVALID>	<mailman.129.1267553139.23598.python-list@python.org>	<20100302225156.67171851@geekmail.INVALID>
	<877hpuxpdf.fsf@benfinney.id.au>
Message-ID: <7v6ae4Ff37U1@mid.individual.net>

Ben Finney wrote:

> Just as customers should demand both that a building be built to do its
> job well, *and* that its architectural plans meet measurable, testable
> industry standards of quality for independent re-use at some
> indeterminate later date.

A problem is that it's very hard to come up with
*measurable* standards of code quality.

There's no equivalent in the software world of
specifying a grade of steel or type of sand.
The things that really matter are all subjective.

-- 
Greg


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar  3 00:48:49 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 03 Mar 2010 05:48:49 GMT
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
	<87eik3zmi8.fsf@benfinney.id.au>
	<20100302184056.743a71e7@geekmail.INVALID>
	<mailman.129.1267553139.23598.python-list@python.org>
	<20100302225156.67171851@geekmail.INVALID>
	<877hpuxpdf.fsf@benfinney.id.au> <7v6ae4Ff37U1@mid.individual.net>
Message-ID: <pan.2010.03.03.05.48.49@REMOVE.THIS.cybersource.com.au>

On Wed, 03 Mar 2010 18:40:00 +1300, Gregory Ewing wrote:

> Ben Finney wrote:
> 
>> Just as customers should demand both that a building be built to do its
>> job well, *and* that its architectural plans meet measurable, testable
>> industry standards of quality for independent re-use at some
>> indeterminate later date.
> 
> A problem is that it's very hard to come up with *measurable* standards
> of code quality.
> 
> There's no equivalent in the software world of specifying a grade of
> steel or type of sand. The things that really matter are all subjective.

True, but one can look at "best practice", or even "standard practice". 
For Python coders, using docstrings is standard practice if not best 
practice. Using strings as comments is not.

Or one can simply use *reason*: what justification is there for putting 
comments in strings at the top of the function? The only one I can see is 
if you are writing for an embedded device, you may want to remove doc 
strings to save memory -- and even that is implementation dependent.

What justification is there for putting docstrings in functions? Code 
becomes self-documenting, you can run Python tools that extract and run 
doctests, standard tools in the standard library work, other coders will 
immediately understand what you have done, and (unlike the behaviour of 
string-comments) the behaviour of docstrings is guaranteed by the 
language.

Unless you are writing for an embedded devise, there is NO objective 
reason for putting comments in strings above the function, and MANY 
objective reasons for putting them into docstrings. Okay, this isn't 
quite the same as measuring the strength of concrete under compression, 
but it's not a subjective choice like "tea or coffee?".



-- 
Steven


From greg.ewing at canterbury.ac.nz  Wed Mar  3 01:14:41 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Wed, 03 Mar 2010 19:14:41 +1300
Subject: Queue peek?
In-Reply-To: <mailman.156.1267578012.23598.python-list@python.org>
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>	<58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>	<mailman.138.1267559095.23598.python-list@python.org>	<hmjqkr$r46$1@news.eternal-september.org>	<eae285401003021233i7a62771h590a557341f10ca4@mail.gmail.com>	<hmk1er$mlb$1@dough.gmane.org>	<1267567723.4101.28.camel@localhost.localdomain>
	<mailman.156.1267578012.23598.python-list@python.org>
Message-ID: <7v6cf4FnnrU1@mid.individual.net>

MRAB wrote:

> I suppose it depends on the complexity of the data structure. A dict's
> methods are threadsafe, for example, but if you have a data structure
> where access leads to multiple method calls then collectively they need
> a lock.

It also depends on the nature of the objects being used
as dict keys. Dict operations invoke the hashing and
comparison methods of the keys, which in general can
execute arbitrary Python code.

If the keys are elementary built-in types such as
strings or ints, then dict operations will *probably*
be atomic. But I think I'd use a lock anyway, to be
on the safe side.

-- 
Greg


From groups at sonic.net  Wed Mar  3 01:18:11 2010
From: groups at sonic.net (Isaac)
Date: Tue, 2 Mar 2010 22:18:11 -0800
Subject: Need bluez/python ( PyBluez) method to access BlueZ data- Please Help!
Message-ID: <4b8dff1e$0$22093$742ec2ed@news.sonic.net>

Hi,

I need to access data that is handled and stored in the BlueZ file system, 
but is, unfortunately, not available via the current BlueZ D-Bus API.

That is, the data I need is parsed by BlueZ, but not provided in the current 
D-Bus signal.

I need a method or interface that does not rely on the D-Bus API and can 
directly access the BlueZ file system to get this parsed data.

Can PyBlueZ do this? If not, any suggestions would be immensely appreciated.

Thanks!
Isaac 




From greg.ewing at canterbury.ac.nz  Wed Mar  3 01:23:27 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Wed, 03 Mar 2010 19:23:27 +1300
Subject: case do problem
In-Reply-To: <hmjjnn$arj$1@news.eternal-september.org>
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
	<hmjjnn$arj$1@news.eternal-september.org>
Message-ID: <7v6cviFq18U1@mid.individual.net>

Alf P. Steinbach wrote:
> * Tracubik:
 >
>> iterations=0;
>> count=0;
>> REPEAT;
>>   iterations = iterations+1;
>>   ...
>>   IF (genericCondition) THEN count=count+1;
>>   ...
>>   CASE count OF:
>>     1: m = 1
>>         2: m = 10
>>         3: m = 100
> 
> Uhm, is this syntactically valid Pascal? As I recall, every Pascal 
> construct was delimited in some way.

I think it's okay. Pascal's control structures such as
if-then and while-do mostly take single statements and
didn't have an ending keyword. If you want multiple
statements in the body you have to put begin-end around
them.

Putting a semicolon after REPEAT is stylistically a
bit odd, but it's not wrong.

-- 
Greg


From timr at probo.com  Wed Mar  3 01:34:29 2010
From: timr at probo.com (Tim Roberts)
Date: Tue, 02 Mar 2010 22:34:29 -0800
Subject: python 2.6: how to modify a PIL image from C without copying
	forth and back
References: <4b8daf7d$0$2868$426a74cc@news.free.fr>
Message-ID: <8m0so5d5lmgg3dombnssflnt1jh6h0ka3v@4ax.com>

News123 <news123 at free.fr> wrote:
>
>I created a grayscale image with PIL.
>
>Now I would like to write a C function, which reads a;most all pixels
>and will modify a few of them.
>
>My current approach is:
>- transform the image to a string()
>- create a byte array huge enough to contain the resulting image
>- call my c_function, which copies over the entire image in order
>   to modify a few pixels
>How can I achieve this with the least amount of copies?

If it were me, I'd be tempted to go peek at the source code for PIL, then
pass the Image object to my C routine and poke at the innards to find the
buffer with the pixels.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From admin at mail.psa-software.com  Wed Mar  3 01:41:53 2010
From: admin at mail.psa-software.com (EVZYN)
Date: Wed, 3 Mar 2010 07:41:53 +0100
Subject: =?windows-1251?B?7+7x7O7y8OXy/CDv7vDt7iD06Ov87CDv8O4g6vPt6Ovo7ePz8Q==?=
Message-ID: <828A25931378487BB0D14EA4A0EFFCE8@server>

An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20100303/f65a3fa9/attachment-0001.html>

From greg.ewing at canterbury.ac.nz  Wed Mar  3 01:52:02 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Wed, 03 Mar 2010 19:52:02 +1300
Subject: Writing an assembler in Python
In-Reply-To: <kyo49n.gr4@spenarnc.xs4all.nl>
References: <Xns9D28186AF890Cfdnbgui7uhu5h8hrnuio@127.0.0.1>
	<kyo49n.gr4@spenarnc.xs4all.nl>
Message-ID: <7v6el6F1ddU1@mid.individual.net>

> In article <Xns9D28186AF890Cfdnbgui7uhu5h8hrnuio at 127.0.0.1>,
> Giorgos Tzampanakis  <gt67 at hw.ac.uk> wrote:
> 
>>I'm implementing a CPU that will run on an FPGA. I want to have a
>>(dead) simple assembler that will generate the machine code for
>>me. I want to use Python for that. Are there any libraries that
>>can help me with the parsing of the assembly code?

I wrote a PIC assembler in Python once. I didn't bother
with any parsing libraries. I used a regular expression
to split the input into tokens, then wrote ad-hoc
parsing code in Python.

-- 
Greg


From pankaj.kr at gmail.com  Wed Mar  3 02:03:31 2010
From: pankaj.kr at gmail.com (Pankaj)
Date: Tue, 2 Mar 2010 23:03:31 -0800 (PST)
Subject: timeout restart in pexpect
Message-ID: <f05f83f3-22e6-49a6-b9d0-cf74ee6acf33@o16g2000prh.googlegroups.com>

I am using pexpect to automate some procedures.

My procedures are time cosuming, some messages coming out from that,
in failure cases it will not output anything.

So I would like to give small timeout value but when some message is
received, it should restart the timeout, similar like
"restart_timeout_upon_receive" in perl.

Is it possible in Python using pexpect ?


From i3enhamin at gmail.com  Wed Mar  3 02:06:13 2010
From: i3enhamin at gmail.com (Ben Racine)
Date: Tue, 2 Mar 2010 23:06:13 -0800
Subject: nonunique string replacements
Message-ID: <6E340E6F-59D9-4E26-9491-F0891AD9B6F0@gmail.com>

All,

Say I have a string "l" ...

l = 'PBUSH     201005       K      1.      1.      1.      1.      1.      1.'

And I want to replace the first "   1." with a "500.2" and the second "  1." with " 5.2" ...

What pythonic means would you all recommend?

Note the whitespace is equal between the existing substring and the replacement string.

Many thanks,
Ben Racine
i3enhamin at gmail.com





From anand.shashwat at gmail.com  Wed Mar  3 02:36:13 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Wed, 3 Mar 2010 13:06:13 +0530
Subject: nonunique string replacements
In-Reply-To: <6E340E6F-59D9-4E26-9491-F0891AD9B6F0@gmail.com>
References: <6E340E6F-59D9-4E26-9491-F0891AD9B6F0@gmail.com>
Message-ID: <d4ab53de1003022336t1176925fyb9d32b88eb4b31de@mail.gmail.com>

>>> s = 'PBUSH     201005       K      500      1.      1.      1.
1.      1.'    #Your original string here

>>> l    #Create your desired list
['500.2', '5.2', '5.3', '5.4', '5.5', '5.6', '5.7']

>>> lsep = s.count(' 1.')    #Count the occurrence of seperators

>>> for i in range(lsep):    #Replace all of them by values in list l, one
by one
...     f = s.find(' 1.')
...     s = s[:f] + l[i] + s[f+3:]
...
>>> s    #Your final string
'PBUSH     201005       K      500     500.2     5.2     5.3     5.4
5.5'


~l0nwlf

On Wed, Mar 3, 2010 at 12:36 PM, Ben Racine <i3enhamin at gmail.com> wrote:

> All,
>
> Say I have a string "l" ...
>
> l = 'PBUSH     201005       K      1.      1.      1.      1.      1.
>  1.'
>
> And I want to replace the first "   1." with a "500.2" and the second "
>  1." with " 5.2" ...
>
> What pythonic means would you all recommend?
>
> Note the whitespace is equal between the existing substring and the
> replacement string.
>
> Many thanks,
> Ben Racine
> i3enhamin at gmail.com
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
-------------- next part --------------
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From andreengels at gmail.com  Wed Mar  3 03:09:35 2010
From: andreengels at gmail.com (Andre Engels)
Date: Wed, 3 Mar 2010 09:09:35 +0100
Subject: case do problem
In-Reply-To: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
Message-ID: <6faf39c91003030009h10ad0737xec87012ec5f0395@mail.gmail.com>

On Tue, Mar 2, 2010 at 6:46 PM, Tracubik <affdfsdfdsfsd at b.com> wrote:

>  and, generally
> speaking, the try..except block slow down the execution of the program or
> not?

Try...except tends to be slow when the exception does occur, fast when
it does not. Apart from that, if these
fraction-of-a-fraction-of-a-second gains are important to you, Python
is not the programming language for you.

In Python, it seems to be common to do optimization after rather than
during the main coding, and then only when it is necessary and only
where it matters. That is:
1. Program your solution without looking much at speed issues
2. Check if it is fast enough. If so, ready.
3. If not, see which parts of the program are being slow
4. Optimize only those parts of the program that have been identified in step 3

-- 
Andr? Engels, andreengels at gmail.com


From tomf.sessile at gmail.com  Wed Mar  3 03:23:16 2010
From: tomf.sessile at gmail.com (TomF)
Date: Wed, 3 Mar 2010 00:23:16 -0800
Subject: cpan for python?
References: <mailman.20.1267367545.23598.python-list@python.org>
	<hmjv4b$mqk$1@reader1.panix.com>
	<2010030214473616807-tomfsessile@gmailcom>
	<4b8ddea4$1@dnews.tpgi.com.au>
Message-ID: <2010030300231675249-tomfsessile@gmailcom>

On 2010-03-02 19:59:01 -0800, Lie Ryan <lie.1296 at gmail.com> said:

> On 03/03/2010 09:47 AM, TomF wrote:
>> On 2010-03-02 13:14:50 -0800, R Fritz <rfritz at u.washington.edu> said:
>> 
>>> On 2010-02-28 06:31:56 -0800, ssteinerX at gmail.com said:
>>>> 
>>>> On Feb 28, 2010, at 9:28 AM, Someone Something wrote:
>>>> 
>>>>> Is there something like cpan for python? I like python's syntax, but
>>>>> Iuse perl because of cpan and the tremendous modules that it has.  --
>>>> 
>>>> Please search the mailing list archives.
>>>> 
>>>> This subject has been discussed to absolute death.
>>> 
>>> But somehow the question is not in the FAQ, though the answer is. See:
>>> 
>>> <http://www.python.org/doc/faq/library/#how-do-i-find-a-module-or-application-to-perform-task-x>


There 
>>> 
>> is also a program called cpan, distributed with Perl.  It is used for
>> searching, downloading, installing and testing modules from the CPAN
>> repository.  It's far more extensive than setuptools.  AFAIK the python
>> community has developed nothing like it.
> 
> python have easy_install

easy_install is part of setuptools.  As I said, nothing like cpan.

-Tom



From lipun4u at gmail.com  Wed Mar  3 03:33:17 2010
From: lipun4u at gmail.com (asit)
Date: Wed, 3 Mar 2010 00:33:17 -0800 (PST)
Subject: process mp3 file
Message-ID: <6fc7b483-c9a9-4581-991c-f816a2701526@g8g2000pri.googlegroups.com>

Somebody suggest me a python library for processing mp3 file.  Here I
don't want to play the file.

Thank you


From __peter__ at web.de  Wed Mar  3 03:39:54 2010
From: __peter__ at web.de (Peter Otten)
Date: Wed, 03 Mar 2010 09:39:54 +0100
Subject: case do problem
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
Message-ID: <hml77p$k1v$00$1@news.t-online.com>

Tracubik wrote:

> hi, i've to convert from Pascal this code:

program loop;

function generic_condition: boolean;
begin
   generic_condition := random > 0.7
end;

procedure loop;
var
   iterations, count, m: integer;
begin
   iterations := 0;
   count := 0;
   m := 0;
   repeat
      iterations := iterations+1;
      (*...*)
      writeln(iterations:2, count:2, m:4);
      (*...*)
      if generic_condition then
	    inc(count);
      (*...*)
      case count of
	1: m := 1;
	2: m := 10;
	3: m := 100
      end
   until (count = 4) or (iterations = 20)
end;

begin
   loop;
   writeln("That's all, folks")
end.

Hey, I have a Pascal compiler just one apt-get away ;)

Here's how I'd translate the above, without trying to be too clever:

from random import random

def generic_condition():
    return random() > 0.7

def loop():
    count = 0
    m = 0
    lookup = {1: 1, 2: 10, 3: 100}
    for iterations in range(20): # off by one
        # ...
        print "%2d %1d %3d" % (iterations, count, m)
        # ...
        if generic_condition():
            count += 1
        # ...
        m = lookup.get(count, m)
        if count == 4:
            break

if __name__ == "__main__":
    loop()
    print "That's all, folks"

Something must be wrong with me today because I find the Pascal code /more/ 
readable...

Peter


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar  3 03:42:01 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 03 Mar 2010 08:42:01 GMT
Subject: nonunique string replacements
References: <mailman.166.1267599978.23598.python-list@python.org>
Message-ID: <pan.2010.03.03.08.42.01@REMOVE.THIS.cybersource.com.au>

On Tue, 02 Mar 2010 23:06:13 -0800, Ben Racine wrote:

> All,
> 
> Say I have a string "l" ...
> 
> l = 'PBUSH     201005       K      1.      1.      1.      1.      1.   
>   1.'
> 
> And I want to replace the first "   1." with a "500.2" and the second " 
> 1." with " 5.2" ...
> 
> What pythonic means would you all recommend?

l = l.replace("   1.", "500.2", 1)
l = l.replace("   1.", "5.2", 1)






-- 
Steven


From news123 at free.fr  Wed Mar  3 03:43:21 2010
From: news123 at free.fr (News123)
Date: Wed, 03 Mar 2010 09:43:21 +0100
Subject: python 2.6: how to modify a PIL image from C without copying
	forth and back
In-Reply-To: <8m0so5d5lmgg3dombnssflnt1jh6h0ka3v@4ax.com>
References: <4b8daf7d$0$2868$426a74cc@news.free.fr>
	<8m0so5d5lmgg3dombnssflnt1jh6h0ka3v@4ax.com>
Message-ID: <4b8e2129$0$8262$426a34cc@news.free.fr>

Hi Tim,

Tim Roberts wrote:
> News123 <news123 at free.fr> wrote:
>> I created a grayscale image with PIL.
>>
>> Now I would like to write a C function, which reads a;most all pixels
>> and will modify a few of them.
>>
>> My current approach is:
>> - transform the image to a string()
>> - create a byte array huge enough to contain the resulting image
>> - call my c_function, which copies over the entire image in order
>>   to modify a few pixels
>> How can I achieve this with the least amount of copies?
> 
> If it were me, I'd be tempted to go peek at the source code for PIL, then
> pass the Image object to my C routine and poke at the innards to find the
> buffer with the pixels.

Yes, this might be an option
Somehow though it didn't feel right for me to depend on internal non
documented data types, which might change between releases of PIL.

N


From __peter__ at web.de  Wed Mar  3 03:49:38 2010
From: __peter__ at web.de (Peter Otten)
Date: Wed, 03 Mar 2010 09:49:38 +0100
Subject: nonunique string replacements
References: <mailman.166.1267599978.23598.python-list@python.org>
Message-ID: <hml7q0$9ie$03$1@news.t-online.com>

Ben Racine wrote:

> Say I have a string "l" ...
> 
> l = 'PBUSH     201005       K      1.      1.      1.      1.      1.     
> 1.'
> 
> And I want to replace the first "   1." with a "500.2" and the second " 
> 1." with " 5.2" ...
> 
> What pythonic means would you all recommend?

With regular expressions:

>>> import re
>>> replacements = iter(["one", "two", "three"])
>>> re.compile("replaceme").sub(lambda m: next(replacements), "foo replaceme 
bar replaceme baz replaceme bang")
'foo one bar two baz three bang'

With string methods:

>>> replacements = iter(["", "one", "two", "three"])
>>> "".join(a + b for a, b in zip(replacements, "foo replaceme bar replaceme 
baz replaceme bang".split("replaceme")))
'foo one bar two baz three bang'

Peter


From __peter__ at web.de  Wed Mar  3 04:05:02 2010
From: __peter__ at web.de (Peter Otten)
Date: Wed, 03 Mar 2010 10:05:02 +0100
Subject: Image.frombuffer and warning
References: <4b8dada2$0$6285$426a74cc@news.free.fr>
Message-ID: <hml8ms$mte$00$1@news.t-online.com>

News123 wrote:

> I am using the PIL function from_buffer in python 2.6.4
> 
> I am having the line
> im2 = Image.frombuffer('L',(wx,wy),buf)
> 
> 
> I receive the warning:
>> ./pytest.py:63: RuntimeWarning: the frombuffer defaults may change in
> a future release; for portability, change the call to read:
>>   frombuffer(mode, size, data, 'raw', mode, 0, 1)
>>   im2 = Image.frombuffer('L',(wx,wy),buf)
> 
> 
> Naively I assumed, that changing my code to
> 
> 
> im2 = Image.frombuffer('L',(wx,wy),buf,'raw','L',0,1)
> 
> 
> should fix the issue:
> 
> However I receive exactly the same error as before.
> 
> What am I doing wrong?

I cannot reproduce the problem:

$ cat frombuffer.py
import sys
import Image
wx = 3
wy = 2
buf = "a"*wx*wy
if "--fixed" in sys.argv:
    Image.frombuffer("L", (wx, wy), buf, "raw", "L", 0, 1)
else:
    Image.frombuffer("L", (wx, wy), buf)

$ python frombuffer.py
frombuffer.py:9: RuntimeWarning: the frombuffer defaults may change in a 
future release; for portability, change the call to read:
  frombuffer(mode, size, data, 'raw', mode, 0, 1)
  Image.frombuffer("L", (wx, wy), buf)
$ python frombuffer.py --fixed
$ python -c"import Image; print Image.VERSION"
1.1.6
$ python -V
Python 2.6.4

Peter


From stefan_ml at behnel.de  Wed Mar  3 04:10:22 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 03 Mar 2010 10:10:22 +0100
Subject: python 2.6: how to modify a PIL image from C without copying
	forth and back
In-Reply-To: <4b8daf7d$0$2868$426a74cc@news.free.fr>
References: <4b8daf7d$0$2868$426a74cc@news.free.fr>
Message-ID: <hml91u$13j$1@dough.gmane.org>

News123, 03.03.2010 01:38:
> I created a grayscale image with PIL.
>
> Now I would like to write a C function, which reads a;most all pixels
> and will modify a few of them.
>
> My current approach is:
> - transform the image to a string()
> - create a byte array huge enough to contain the resulting image
> - call my c_function, which copies over the entire image in order
>     to modify a few pixels
> How can I achieve this with the least amount of copies?

Take a look at Cython instead, it will allow you to access PIL's image 
buffer directly, instead of copying the data. It will also simplify and 
speed up your C wrapper code.

Stefan



From deets at nospam.web.de  Wed Mar  3 04:17:57 2010
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Wed, 03 Mar 2010 10:17:57 +0100
Subject: conditional import into global namespace
In-Reply-To: <mailman.142.1267562515.23598.python-list@python.org>
References: <hmjita$ms4$1@dough.gmane.org>	<16651e81003021031h3831d4b3i844f331f3d301042@mail.gmail.com>
	<mailman.142.1267562515.23598.python-list@python.org>
Message-ID: <7v6nq5Ffv2U1@mid.uni-berlin.de>

Am 02.03.10 21:41, schrieb mk:
> Jerry Hill wrote:
>> Just import subprocess at the top of your module. If subprocess
>> hasn't been imported yet, it will be imported when your module is
>> loaded. If it's already been imported, your module will use the
>> cached version that's already been imported.
>>
>> In other words, it sounds like Python already does what you want. You
>> don't need to do anything special.
>
> Oh, thanks!
>
> Hmm it's different than dealing with packages I guess -- IIRC, in
> packages only code in package's __init__.py was executed?

I don't understand this. But there is no difference regarding caching & 
execution between packages and modules.

Importing a package will execute the __init__.py, yes. But only once. As 
will importing modules execute them, but only once.

All subsequent imports will just return the created module-object. 
Unless you import something under a new name! That is, you can alter the 
sys.path and then import a package/module under a different name - 
python won't detect that.

Simplest example ist this:

---- test.py ----

class Foo(object):

    pass

if __name__ == "__main__":
    import test # import ourselves
    # this holds, because we have
    # __main__.Foo and test.Foo
    assert Foo is not test.Foo

---- test.py ----

However, unless you mess with python, this is none of your concern.

Diez


From orenelrad at gmail.com  Wed Mar  3 04:27:16 2010
From: orenelrad at gmail.com (Oren Elrad)
Date: Wed, 3 Mar 2010 04:27:16 -0500
Subject: Interest check in some delicious syntactic sugar for "except:pass"
Message-ID: <35e00b331003030127y11b4964ev8c71417a2599eeec@mail.gmail.com>

Howdy all, longtime appreciative user, first time mailer-inner.

I'm wondering if there is any support (tepid better than none) for the
following syntactic sugar:

silence:
........ block

------------------------->

try:
........block
except:
........pass

The logic here is that there are a ton of "except: pass" statements[1]
floating around in code that do not need to be there. Meanwhile, the
potential keyword 'silence' does not appear to be in significant use
as a variable[2], or an alternative keyword might be imagined
('quiet', 'hush', 'stfu') but I somewhat like the verbiness of
'silence' since that is precisely what it does to the block (that is,
you have to inflect it as a verb, not a noun -- you are telling the
block to be silent). Finally, since this is the purest form of
syntactic sugar, I cannot fathom any parsing, interpreting or other
complications that would arise.

I appreciate any feedback, including frank statements that you'd
rather not trifle with such nonsense.

~Oren

[1] http://www.google.com/codesearch?q=except%3A\spass&hl=en
[2] http://www.google.com/codesearch?hl=en&lr=&q=silence+lang%3Apy


From news123 at free.fr  Wed Mar  3 04:37:43 2010
From: news123 at free.fr (News123)
Date: Wed, 03 Mar 2010 10:37:43 +0100
Subject: python 2.6: how to modify a PIL image from C without copying
	forth and back
In-Reply-To: <mailman.169.1267607707.23598.python-list@python.org>
References: <4b8daf7d$0$2868$426a74cc@news.free.fr>
	<mailman.169.1267607707.23598.python-list@python.org>
Message-ID: <4b8e2de8$0$21576$426a74cc@news.free.fr>

Hi Stefan,

Stefan Behnel wrote:
> News123, 03.03.2010 01:38:
>> I created a grayscale image with PIL.
>>
>> Now I would like to write a C function, which reads a;most all pixels
>> and will modify a few of them.
>>
>> My current approach is:
>> - transform the image to a string()
>> - create a byte array huge enough to contain the resulting image
>> - call my c_function, which copies over the entire image in order
>>     to modify a few pixels
>> How can I achieve this with the least amount of copies?
> 
> Take a look at Cython instead, it will allow you to access PIL's image
> buffer directly, instead of copying the data. It will also simplify and
> speed up your C wrapper code.
> 
> Stefan
> 

I don't know Cython. Having looked at the web site I'm not entirely
sure, I understood your suggestion.

Do you mean
-  to stay with Python 2.6 and to implement only my extension in Cython.
This might be very attractive. If yes, can you recommend some url's /
tutorials / etc. which might help to implement a cython extension for
python2.6. which reads and modifies a pixel of a PIL image.

or do you mean
- to switch entirely from Python 2.6 to Cython. I would be reluctant to
do so, as I have already a lot of existing code. and I do not have the
time to check the entire code base for portability issues



thanks in advance


N


From phil at freehackers.org  Wed Mar  3 04:40:24 2010
From: phil at freehackers.org (BlueBird)
Date: Wed, 3 Mar 2010 01:40:24 -0800 (PST)
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
Message-ID: <b4859d9f-2dec-4c1b-af27-b720345871a5@b7g2000yqd.googlegroups.com>

On Feb 24, 9:23?pm, Andreas Waldenburger <use... at geekmail.INVALID>
wrote:
> Hi all,
>
> a company that works with my company writes a lot of of their code in
> Python (lucky jerks). I've seen their code and it basically looks like
> this:
>
> """Function that does stuff"""
> def doStuff():
> ? ? while not wise(up):
> ? ? ? ? yield scorn
>
> Now my question is this: How do I kill these people without the
> authorities thinking they didn't deserve it?

If they are generating their doc with doxygen, I think it's the right
choice. See:

http://www.stack.nl/~dimitri/doxygen/docblocks.html#pythonblocks

Oops, after a second look, doxygen needs comments before the function,
not doc strings.

Philippe


From news123 at free.fr  Wed Mar  3 04:44:26 2010
From: news123 at free.fr (News123)
Date: Wed, 03 Mar 2010 10:44:26 +0100
Subject: Image.frombuffer and warning
In-Reply-To: <hml8ms$mte$00$1@news.t-online.com>
References: <4b8dada2$0$6285$426a74cc@news.free.fr>
	<hml8ms$mte$00$1@news.t-online.com>
Message-ID: <4b8e2f7a$0$13729$426a74cc@news.free.fr>

Hi Peter,

Peter Otten wrote:
> News123 wrote:
> I cannot reproduce the problem:
> 
> $ cat frombuffer.py
> import sys
> import Image
> wx = 3
> wy = 2
> buf = "a"*wx*wy
> if "--fixed" in sys.argv:
>     Image.frombuffer("L", (wx, wy), buf, "raw", "L", 0, 1)
> else:
>     Image.frombuffer("L", (wx, wy), buf)
> 
> $ python frombuffer.py
> frombuffer.py:9: RuntimeWarning: the frombuffer defaults may change in a 
> future release; for portability, change the call to read:
>   frombuffer(mode, size, data, 'raw', mode, 0, 1)
>   Image.frombuffer("L", (wx, wy), buf)
> $ python frombuffer.py --fixed
> $ python -c"import Image; print Image.VERSION"
> 1.1.6
> $ python -V
> Python 2.6.4
> 
> Peter

You're absolutely right. It was my error.
I shouldn't do any lat night coding :-(.

I fixed one frombuffer() statement, but overlooked a second one in my
code :-(


Apologies


N




From pankaj.kr at gmail.com  Wed Mar  3 04:50:27 2010
From: pankaj.kr at gmail.com (Pankaj)
Date: Wed, 3 Mar 2010 01:50:27 -0800 (PST)
Subject: exp_internal in pexpect
Message-ID: <4aa75aa4-e89b-40b9-b84a-c25ecf907815@l12g2000prg.googlegroups.com>

how to enable expect log in pexpect ? (similar as exp_internal in
expect)


From stefan_ml at behnel.de  Wed Mar  3 05:10:21 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 03 Mar 2010 11:10:21 +0100
Subject: python 2.6: how to modify a PIL image from C without copying
	forth and back
In-Reply-To: <4b8e2de8$0$21576$426a74cc@news.free.fr>
References: <4b8daf7d$0$2868$426a74cc@news.free.fr>	<mailman.169.1267607707.23598.python-list@python.org>
	<4b8e2de8$0$21576$426a74cc@news.free.fr>
Message-ID: <hmlcie$dl2$1@dough.gmane.org>

News123, 03.03.2010 10:37:
> Stefan Behnel wrote:
>> Take a look at Cython instead, it will allow you to access PIL's image
>> buffer directly, instead of copying the data. It will also simplify and
>> speed up your C wrapper code.
>
> I don't know Cython. Having looked at the web site I'm not entirely
> sure, I understood your suggestion.
>
> Do you mean
> -  to stay with Python 2.6 and to implement only my extension in Cython.

Absolutely.


> This might be very attractive. If yes, can you recommend some url's /
> tutorials / etc. which might help to implement a cython extension for
> python2.6. which reads and modifies a pixel of a PIL image.

Check out the tutorial on the web site, and ask on the cython-users mailing 
list about integration with PIL. I'm sure you'll get some useful examples.

Here's something closely related, although it doesn't really use PIL (but 
the mechanisms are the same):

http://wiki.cython.org/examples/mandelbrot


> or do you mean
> - to switch entirely from Python 2.6 to Cython. I would be reluctant to
> do so, as I have already a lot of existing code. and I do not have the
> time to check the entire code base for portability issues

The nice thing about Cython is that you always have a normal CPython 
interpreter running, so you can split your code between the interpreter and 
the compiler at any level of granularity. However, the advice was really to 
write your image processing algorithm in Cython, not your entire program.

Stefan



From geoff.bache at jeppesen.com  Wed Mar  3 05:14:08 2010
From: geoff.bache at jeppesen.com (geoffbache)
Date: Wed, 3 Mar 2010 02:14:08 -0800 (PST)
Subject: PYTHONPATH and eggs
Message-ID: <86ee3b75-b3f5-4172-90c8-e90f0e50b89f@a18g2000yqc.googlegroups.com>

Hi all,

I have a very simple problem that seems to have no simple solution.

I have a module which is installed centrally and lives in a Python
egg. I have experimented with some minor changes to it and would like
to set my PYTHONPATH to pick up my local copy of it, but don't want to
have to figure out how to build my own version of the "egg" if
possible.

Unfortunately, the location from PYTHONPATH ends up after the eggs in
sys.path so I can't persuade Python to import my version. The only way
I've found to fix it is to copy the main script and manually hack
sys.path at the start of it which isn't really very nice. I wonder if
there is any better way as I can't be the first person to want to do
this, surely?

I've seen this issue has been discussed elsewhere and flagged as a
problem (e.g.
http://mail.python.org/pipermail/distutils-sig/2009-January/010755.html)

but I've been unable to find any suggestions for workarounds or
indications whether this will be/has been fixed.

Regards,
Geoff Bache


From clp2 at rebertia.com  Wed Mar  3 05:25:02 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 3 Mar 2010 02:25:02 -0800
Subject: Interest check in some delicious syntactic sugar for 
	"except:pass"
In-Reply-To: <35e00b331003030127y11b4964ev8c71417a2599eeec@mail.gmail.com>
References: <35e00b331003030127y11b4964ev8c71417a2599eeec@mail.gmail.com>
Message-ID: <50697b2c1003030225j28c18507r619cf15aeddb8c41@mail.gmail.com>

On Wed, Mar 3, 2010 at 1:27 AM, Oren Elrad <orenelrad at gmail.com> wrote:
> Howdy all, longtime appreciative user, first time mailer-inner.
>
> I'm wondering if there is any support (tepid better than none) for the
> following syntactic sugar:
>
> silence:
> ........ block
>
> ------------------------->
>
> try:
> ........block
> except:
> ........pass
>
> The logic here is that there are a ton of "except: pass" statements[1]
> floating around in code that do not need to be there.

So, why exactly should the language /encourage/ unnecessary error
silencing? (which is what the proposed sugar would do)

> I appreciate any feedback

Applicable rules of The Zen[1] that the proposal arguably violates:
*Special cases aren't special enough to break the rules.
*There should be one-- and preferably only one --obvious way to do it.

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

[1]: http://www.python.org/dev/peps/pep-0020/


From clp2 at rebertia.com  Wed Mar  3 05:25:42 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 3 Mar 2010 02:25:42 -0800
Subject: process mp3 file
In-Reply-To: <6fc7b483-c9a9-4581-991c-f816a2701526@g8g2000pri.googlegroups.com>
References: <6fc7b483-c9a9-4581-991c-f816a2701526@g8g2000pri.googlegroups.com>
Message-ID: <50697b2c1003030225p2b32662ct960ad477d9d3c8f5@mail.gmail.com>

On Wed, Mar 3, 2010 at 12:33 AM, asit <lipun4u at gmail.com> wrote:
> Somebody suggest me a python library for processing mp3 file. ?Here I
> don't want to play the file.

Define "processing".

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


From davea at ieee.org  Wed Mar  3 05:40:56 2010
From: davea at ieee.org (Dave Angel)
Date: Wed, 03 Mar 2010 05:40:56 -0500
Subject: Interest check in some delicious syntactic sugar for "except:pass"
In-Reply-To: <35e00b331003030127y11b4964ev8c71417a2599eeec@mail.gmail.com>
References: <35e00b331003030127y11b4964ev8c71417a2599eeec@mail.gmail.com>
Message-ID: <4B8E3CB8.70302@ieee.org>

Oren Elrad wrote:
> Howdy all, longtime appreciative user, first time mailer-inner.
>
> I'm wondering if there is any support (tepid better than none) for the
> following syntactic sugar:
>
> silence:
> ........ block
>
> ------------------------->
>
> try:
> ........block
> except:
> ........pass
>
> The logic here is that there are a ton of "except: pass" statements[1]
> floating around in code that do not need to be there. Meanwhile, the
> potential keyword 'silence' does not appear to be in significant use
> as a variable[2], or an alternative keyword might be imagined
> ('quiet', 'hush', 'stfu') but I somewhat like the verbiness of
> 'silence' since that is precisely what it does to the block (that is,
> you have to inflect it as a verb, not a noun -- you are telling the
> block to be silent). Finally, since this is the purest form of
> syntactic sugar, I cannot fathom any parsing, interpreting or other
> complications that would arise.
>
> I appreciate any feedback, including frank statements that you'd
> rather not trifle with such nonsense.
>
> ~Oren
>
> [1] http://www.google.com/codesearch?q=except%3A\spass&hl=en
> [2] http://www.google.com/codesearch?hl=en&lr=&q=silence+lang%3Apy
>
>   
I presume you know that there's a feature freeze on for Python.  So such 
an idea wouldn't be considered for at least a couple of years.  But that 
shouldn't inhibit such discussions.

I wonder if you're intending that silence: denotes a block in which all 
exceptions would be ignored.  And that any calls made from there that 
threw exceptions would also be ignored.

If so, it's a bad idea.  Only if you could qualify it to a particular 
exception list might it be reasonable.  As it stands, it's just as bad 
as the bare try/except that you were already given.  Do you really want 
to ignore syntax errors, skip bad data, and ignore missing files, and 
generally plow down whatever execution path happens to result?


Just my opinion.
DaveA


From lipun4u at gmail.com  Wed Mar  3 05:43:38 2010
From: lipun4u at gmail.com (asit)
Date: Wed, 3 Mar 2010 02:43:38 -0800 (PST)
Subject: process mp3 file
References: <6fc7b483-c9a9-4581-991c-f816a2701526@g8g2000pri.googlegroups.com>
	<mailman.173.1267611946.23598.python-list@python.org>
Message-ID: <9ab3890c-14b9-4031-96c1-6f991469c9ae@m35g2000prh.googlegroups.com>


> Define "processing".

getting the title, song name, etc of the file and updating in a
database


From bruno.42.desthuilliers at websiteburo.invalid  Wed Mar  3 05:56:03 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 03 Mar 2010 11:56:03 +0100
Subject: Method / Functions - What are the differences?
In-Reply-To: <hmk1mn$70u$1@newsreader3.netcologne.de>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
	<mailman.109.1267539415.23598.python-list@python.org>
	<hmk1mn$70u$1@newsreader3.netcologne.de>
Message-ID: <4b8e4041$0$17447$426a34cc@news.free.fr>

Eike Welk a ?crit :
> John Posner wrote:
>> I've updated the text at this location:
>>
>>  >   http://cl1p.net/bruno_0301.rst/
> 
> I think this is a very useful writeup! 
> 
> It would be perfect with a little bit of introduction that says:
> 1. - What it is: "The rough details of method look-up";
> 2. - which contains some of the questions that that made that authors write 
> the text. This way people with similar questions can find it with Google.
> 

John, do you think you could something with the following ?

"""
"Is it a function ? is it a method ? No, it's... " - or : What's in a 
Python method ?

Python newcomers often have hard time understanding the "magic" behind 
Python's methods - and truth is that Python's object model can be a bit 
peculiar when compared to most mainstream (or not-so-mainstream) OOPLs. 
As a matter of fact, there are quite a few threads on c.l.py with either 
direct or indirect questions about what makes a Python method, and I 
must have explained the whole mechanism at least 3 or 4 times there. The 
following text is an edited version of my last attempt, as edited, 
corrected and published by John Posner, MayHisNameBePraised(tm).

This text isn't meant as a replacement for neither the official 
FineManual(tm)[XXX : relevant link] nor the very excellent - if somehow 
technical - 'Descriptors how-to' [XXX : relevant link]. It's mostly a 
brief but hopefully helpful overview of what exactly is a Python method, 
and how Python magically inserts the 'self' or 'cls' argument to method 
calls.
"""

Feel free to edit / amend / rewrite / trash at will - you're now 
officially in charge of publishing this text !-)



From andreengels at gmail.com  Wed Mar  3 06:02:32 2010
From: andreengels at gmail.com (Andre Engels)
Date: Wed, 3 Mar 2010 12:02:32 +0100
Subject: Interest check in some delicious syntactic sugar for 
	"except:pass"
In-Reply-To: <35e00b331003030127y11b4964ev8c71417a2599eeec@mail.gmail.com>
References: <35e00b331003030127y11b4964ev8c71417a2599eeec@mail.gmail.com>
Message-ID: <6faf39c91003030302l30105064n675b449b45ac1968@mail.gmail.com>

On Wed, Mar 3, 2010 at 10:27 AM, Oren Elrad <orenelrad at gmail.com> wrote:
> Howdy all, longtime appreciative user, first time mailer-inner.
>
> I'm wondering if there is any support (tepid better than none) for the
> following syntactic sugar:
>
> silence:
> ........ block
>
> ------------------------->
>
> try:
> ........block
> except:
> ........pass
>
> The logic here is that there are a ton of "except: pass" statements[1]
> floating around in code that do not need to be there. Meanwhile, the
> potential keyword 'silence' does not appear to be in significant use
> as a variable[2], or an alternative keyword might be imagined
> ('quiet', 'hush', 'stfu') but I somewhat like the verbiness of
> 'silence' since that is precisely what it does to the block (that is,
> you have to inflect it as a verb, not a noun -- you are telling the
> block to be silent). Finally, since this is the purest form of
> syntactic sugar, I cannot fathom any parsing, interpreting or other
> complications that would arise.
>
> I appreciate any feedback, including frank statements that you'd
> rather not trifle with such nonsense.

I would be against this, because "except: pass" is a terrible code
smell. Usage of exceptions can roughly be divided into two areas:

1. Cases where you do know quite well what might go wrong
2. Cases where all kind of stuff might go wrong, including things you
perhaps did not think of, and want to deal with all of them

In the first case, you should not use a blanket "except", but a more
specific one, catching only the specific error or errors you are
dealing with.

In the second case, a blanket except might well be correct, but in
that case, you should not want to pass over the error silently.
Usually you will want to notify the user that an error has occurred.
Even if that is not the case, you want to make some kind of logging of
the error, so that you have the chance of finding it if it is indeed
an unexpected (and therefore undoubtedly also unintended) error.

Doing a pass over an exception is not a bad thing in itself, but one
should only do it when one _knows_ that it is the right action to
take. If you have a general exception, you don't know _what_ has gone
wrong, so you sure as hell cannot be sure about what's the best action
to take. Doing nothing might well be your best guess, but even in that
case I want to know that your program has been guessing when I use it.

-- 
Andr? Engels, andreengels at gmail.com


From clp2 at rebertia.com  Wed Mar  3 06:06:55 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 3 Mar 2010 03:06:55 -0800
Subject: process mp3 file
In-Reply-To: <9ab3890c-14b9-4031-96c1-6f991469c9ae@m35g2000prh.googlegroups.com>
References: <6fc7b483-c9a9-4581-991c-f816a2701526@g8g2000pri.googlegroups.com>
	<mailman.173.1267611946.23598.python-list@python.org>
	<9ab3890c-14b9-4031-96c1-6f991469c9ae@m35g2000prh.googlegroups.com>
Message-ID: <50697b2c1003030306g1939a4bbg799e4f158f99f4c4@mail.gmail.com>

On Wed, Mar 3, 2010 at 2:43 AM, asit <lipun4u at gmail.com> wrote:
>> Define "processing".
>
> getting the title, song name, etc of the file and updating in a
> database

You'd want an ID3 tag library then. Here's one:

http://eyed3.nicfit.net/

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


From durumdara at gmail.com  Wed Mar  3 06:12:12 2010
From: durumdara at gmail.com (durumdara at gmail.com)
Date: Wed, 03 Mar 2010 12:12:12 +0100
Subject: easy install failed
Message-ID: <4B8E440C.2070204@gmail.com>

Hi!

Windows, Py2.6.

I read about Pyda and Spider. I used Pyscripter, Geany, ULIPAD, and 
COntext, and Netbeans with Python; but I want to try these products.

But easy_install failed on get them:

    C:\Python26\Scripts>easy_install.exe pida
    Searching for pida
    Reading http://pypi.python.org/simple/pida/
    Reading http://pida.co.uk/
    Reading http://pida.co.uk/download/
    Reading http://pida.vm.bytemark.co.uk/
    Reading http://code.google.com/p/pida/downloads/list
    Reading http://pida.berlios.de
    Reading http://pida.berlios.de/index.php/PIDA:Downloads
    Reading http://pida.berlios.de/downloads/
    Best match: pida 0.6beta3
    Downloading
    http://pypi.python.org/packages/source/p/pida/pida-0.6beta3.tar.gz#m
    d5=ecd790f5dd6f77eb4ebfc719f8e26114
    Processing pida-0.6beta3.tar.gz
    Running pida-0.6beta3\setup.py -q bdist_egg --dist-dir
    c:\docume~1\chris\locals~
    1\temp\easy_install-vd4hql\pida-0.6beta3\egg-dist-tmp-9zwwxx
    error: A rendszer nem tal?lja a megadott f?jlt
    {The system cannot found the file}

Many of packages are not installed on my system, because of "file" or 
"path" not found.

For example:

    C:\Python26\Scripts>easy_install.exe kiwi
    Searching for kiwi
    Reading http://pypi.python.org/simple/kiwi/
    Reading http://www.ivy.fr/kiwi
    Best match: kiwi 0.8.6
    Downloading http://www.ivy.fr/kiwi/kiwi-0.8.6.tar.gz
    Processing kiwi-0.8.6.tar.gz
    error: Couldn't find a setup script in
    c:\docume~1\chris\locals~1\temp\easy_inst
    all-dxia7w\kiwi-0.8.6.tar.gz

May these packages not have "setup.py"?
Or not working in Windows?
Or they have binaries somewhere, like pywin32, and wxpython?

THanks for your help:
     dd
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From orenelrad at gmail.com  Wed Mar  3 06:47:28 2010
From: orenelrad at gmail.com (Oren Elrad)
Date: Wed, 3 Mar 2010 06:47:28 -0500
Subject: Re Interest check in some delicious syntactic sugar for "except:pass"
Message-ID: <35e00b331003030347x30f3f2faua96a9b72814743da@mail.gmail.com>

To all that responded, thanks for the prompt response folks, your
criticisms are well taken. Coming from Cland, one is inculcated with
the notion that if the programmer wants to shoot himself in the foot
the language ought not to prevent that (or even should return him a
loaded magnum with the safety off and the hair-trigger pulled). My
apologies for not immediately grokking the cultural difference in
pytown.

With that said, let me at least offer a token defense of my position.
By way of motivation, I wrote that email after copying/pasting the
following a few times around a project until I wrote it into def
SilentlyDelete() and its cousin SilentlyRmdir()

""" code involving somefile """
try:
........os.remove(somefile)
except:
.......pass     # The bloody search indexer has got the file and I
can't delete it. Nothing to be done.

Certainly the parade of horribles (bad files! corrupt data! syntax
errors!) is a tad melodramatic. Either os.remove() succeeds or it
doesn't and the execution path (in the estimation of this programmer,
at least) is not at all impacted by whether it succeeds or fails. I
know with certainty at compile time what exceptions might be raised
and what the consequences of passing them are and there is no sense
pestering the user or sweating over it. Nor can I see the logic, as
was suggested, in writing "except OSError:" since (seems to me) mere
surplusage -- it neither causes a semantic difference in the way the
program runs nor provides anything useful to the reader.

Now, perhaps this is a special case that is not nearly special enough
to warrant its own syntactic sugar, I granted that much, but >30,000
examples in Google Code cannot be considered to be a complete corner
case either. Briefly skimming those results, most of them seem to be
of this flavor, not the insane programmer that wants to write
"silence: CommitDBChangesEmailWifeAndAdjustBankAccount()" nor novices
that aren't aware of what they might be ignoring.

At any rate (and since this is far more words than I had intended), I
want to reiterate that the criticism is well-taken as a cultural
matter. I just don't want everyone to think I'm bloody insane or that
I'm not aware this is playing with fire. Maybe we can put it in module
"YesImSureJustBloodyDoItAlreadyGoddamnit"  and prints an ASCII skull
and crossbones to the console when imported? :-P

~ Oren

PS. I did like Dave's suggestions that one might want to write
"silence Type1 Type2:" which I suppose goes a long way towards
alleviating the concern that the programmer doesn't know what he's
missing. Doesn't quite meet my desire (both syntaxes would be nice, of
course) to avoid the verbiage involved with explaining to the compiler
(or the next reader) something that it knows well enough by now (or
ought to know, at least).


From tibor.beck at hotmail.com  Wed Mar  3 06:57:13 2010
From: tibor.beck at hotmail.com (gentlestone)
Date: Wed, 3 Mar 2010 03:57:13 -0800 (PST)
Subject: monkey patching with @classmethod
Message-ID: <b4ecc2a9-0ef4-43fa-999d-fdfb23b2ee4f@c16g2000yqd.googlegroups.com>

Hi, is there some well-known problems with class method monkey
patching?

I've got this error message:

unbound method get_pocet_neocislovanych() must be called with Pozemok
instance as first argument (got Subjekt instance instead)

The method is declared as:
@classmethod
@monkeypatch(Dokument)
def get_pocet_neocislovanych(cls, subjekt):
    return cls.objects.filter(subjekt = subjekt, cislo__isnull =
True).count() # or pass, this line is not important

and the monkey patch decorator is declared as:
def monkeypatch(cls):
    def decorator(func):
        setattr(cls, func.__name__, func)
        return func
    return decorator

If I move the method to class declaration (whitout monkey patching),
everything is ok, but only if I've restarted the server.


From bruno.42.desthuilliers at websiteburo.invalid  Wed Mar  3 07:09:12 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 03 Mar 2010 13:09:12 +0100
Subject: monkey patching with @classmethod
In-Reply-To: <b4ecc2a9-0ef4-43fa-999d-fdfb23b2ee4f@c16g2000yqd.googlegroups.com>
References: <b4ecc2a9-0ef4-43fa-999d-fdfb23b2ee4f@c16g2000yqd.googlegroups.com>
Message-ID: <4b8e5161$0$23009$426a74cc@news.free.fr>

gentlestone a ?crit :
> Hi, is there some well-known problems with class method monkey
> patching?
> 
> I've got this error message:
> 
> unbound method get_pocet_neocislovanych() must be called with Pozemok
> instance as first argument (got Subjekt instance instead)

> The method is declared as:
> @classmethod
> @monkeypatch(Dokument)
> def get_pocet_neocislovanych(cls, subjekt):
>     return cls.objects.filter(subjekt = subjekt, cislo__isnull =
> True).count() # or pass, this line is not important
> 
> and the monkey patch decorator is declared as:
> def monkeypatch(cls):
>     def decorator(func):
>         setattr(cls, func.__name__, func)
>         return func
>     return decorator

The decorators are applied in order. So you first add the yet 
undecorated function as an attribute of the class, then pass the 
function to classmethod.

FWIW, this monkeypatch decorator is IMHO a plain waste of time. The 
following code does the same thing and is (IMHO again) *much* more readable:

def get_pocet_neocislovanych(cls, subjekt):
      return cls.objects.filter(
         subjekt=subjekt,
         cislo__isnull= True
         ).count() # or pass, this line is not important

Dokument.get_pocet_neocislovanych=@classmethod(get_pocet_neocislovanych)

Also, Django's BestPractice(tm) is to define such "query" methods on the 
  model's manager, not as a classmethod of the model.

My 2 cents


From tibor.beck at hotmail.com  Wed Mar  3 07:11:30 2010
From: tibor.beck at hotmail.com (gentlestone)
Date: Wed, 3 Mar 2010 04:11:30 -0800 (PST)
Subject: monkey patching with @classmethod
References: <b4ecc2a9-0ef4-43fa-999d-fdfb23b2ee4f@c16g2000yqd.googlegroups.com>
Message-ID: <1a134530-386e-47e4-9c63-385f8014c838@q15g2000yqj.googlegroups.com>

On 3. Mar., 12:57 h., gentlestone <tibor.b... at hotmail.com> wrote:
> Hi, is there some well-known problems with class method monkey
> patching?
>
> I've got this error message:
>
> unbound method get_pocet_neocislovanych() must be called with Pozemok
> instance as first argument (got Subjekt instance instead)
>
> The method is declared as:
> @classmethod
> @monkeypatch(Dokument)
> def get_pocet_neocislovanych(cls, subjekt):
> ? ? return cls.objects.filter(subjekt = subjekt, cislo__isnull =
> True).count() # or pass, this line is not important
>
> and the monkey patch decorator is declared as:
> def monkeypatch(cls):
> ? ? def decorator(func):
> ? ? ? ? setattr(cls, func.__name__, func)
> ? ? ? ? return func
> ? ? return decorator
>
> If I move the method to class declaration (whitout monkey patching),
> everything is ok, but only if I've restarted the server.

for complexity, there is a code I call the method:

def _application_menu(request, subjekt, aplikacia_url_name):
    return render_to_response('subjekty/aplikacia.html', {
        'subjekt' : subjekt,
        'aplikacia_url_name' : aplikacia_url_name,
        'aplikacia_dictionary' :
aplikacia_dictionary(aplikacia_url_name),
        'listy' : [
            (dokument_url_name, dict(
                get_verbose_name_plural =
dokument.get_verbose_name_plural(),
                get_pocet_neocislovanych =
dokument.get_pocet_neocislovanych(subjekt),
                get_pocet_celkom = dokument.get_pocet_celkom(subjekt),
            )) for dokument_url_name, dokument in
aplikacia_dictionary(aplikacia_url_name)['listy']
        ],
    }, context_instance = RequestContext(request))


unfortunately, sometimes it works, sometimes not, I cannot imagine the
reason, why and when it works and not - even whitout monkey patching

seems like some black magic


From albert at spenarnc.xs4all.nl  Wed Mar  3 07:43:34 2010
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 03 Mar 2010 12:43:34 GMT
Subject: Which mock library do you prefer?
References: <f3baba98-a0fc-4c6a-9fff-661da8356bc0@h2g2000yqj.googlegroups.com>
	<485b80f9-96c7-4946-8f38-44eb7d81fe1d@z19g2000yqk.googlegroups.com>
	<87sk90c499.fsf@benfinney.id.au>
	<e88f4781-4b1f-4a9d-8c61-3a13c854c280@d27g2000yqn.googlegroups.com>
Message-ID: <kypi0m.i9s@spenarnc.xs4all.nl>

In article <e88f4781-4b1f-4a9d-8c61-3a13c854c280 at d27g2000yqn.googlegroups.com>,
Lacrima  <lacrima.maxim at gmail.com> wrote:
>On Feb 16, 10:30=A0pm, Ben Finney <ben+pyt... at benfinney.id.au> wrote:
>> Lacrima <lacrima.ma... at gmail.com> writes:
>> > And I have already refused to write totally isolated tests, because it
>> > looks like a great waste of time.
>>
>> It only looks like that until you chase your tail in a long, fruitless
>> debugging session because (you later realise) the behaviour of one test
>> is being affected by another. Test isolation is essential to ensure that
>> your tests are doing what you think they're doing.
>>
>> --
>> =A0\ =A0 =A0 =A0 =93A =91No=92 uttered from deepest conviction is better =
>and greater |
>> =A0 `\ =A0 =A0 =A0 than a =91Yes=92 merely uttered to please, or what is =
>worse, to |
>> _o__) =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0avoid tr=
>ouble.=94 =97Mohandas K. Gandhi |
>> Ben Finney
>
>Hi!
>
>Right, isolation is essential. But I can't decide to which extent I
>should propagate isolation.
>For example, in "Python Testing: Beginner's Guide" by Daniel Arbuckle,
>author suggests that if you do unittesting you should isolate the
>smallest units of code from each other. For example, if you have a
>class:
>Class SomeClass(object):
>    def method1(self):
>        return 5
>    def method2(self):
>        return self.method1 + 10
>
>According to the book, if you want to test method2, you should isolate
>it from method1 and class instance('self').
>Other books are not so strict...
>
>And what should I follow as newbie?
>
>Currently, I don't create mocks of units if they are within the same
>class with the unit under test. If that is not right approach, please,
>explain what are best practices... I am just learning TDD..

Unit testing is a concept that goes well with functions without
side effects. If you have classes, that doesn't work so well.

For classes use cases are the way to go.
Think about it. The whole state of an object can affect the
way a method works. So effectively for a unit test you have
to put the object in a whole special fully controlled state.
The point of an object is that it can't have just any state, but only
those attained by calling methods properly. So you may find yourself
artificially imposing states on an object with great effort, and
expecting error detection where the errors cannot in fact occur etc.
etc.

Not that coming up with good use cases is easy, but at least
they are naturally related to your objects.

>
>with regards,
>Maxim

Groetjes Albert

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- being exponential -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From olof.bjarnason at gmail.com  Wed Mar  3 07:45:28 2010
From: olof.bjarnason at gmail.com (Olof Bjarnason)
Date: Wed, 3 Mar 2010 13:45:28 +0100
Subject: Working group for Python CPAN-equivalence?
Message-ID: <c3dfe1d1003030445w29fd54b1t806fa8a75be978db@mail.gmail.com>

Hi everybody!

The "Where is CPAN for Python?" question keeps popping up, with
answers ranging from "There is no CPAN for Python" and "We already
have CPAN for Python" (confusing).

I'm wondering - is there any work being done identifying ..

(1) what is so good with CPAN?
(2) how can it be brought to the Python world?

Is there a working group/initiative for this? Web page? Discussion group?


/Olof


From stefan_ml at behnel.de  Wed Mar  3 07:52:07 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 03 Mar 2010 13:52:07 +0100
Subject: Working group for Python CPAN-equivalence?
In-Reply-To: <c3dfe1d1003030445w29fd54b1t806fa8a75be978db@mail.gmail.com>
References: <c3dfe1d1003030445w29fd54b1t806fa8a75be978db@mail.gmail.com>
Message-ID: <hmlm1n$eqm$1@dough.gmane.org>

Olof Bjarnason, 03.03.2010 13:45:
> The "Where is CPAN for Python?" question keeps popping up, with
> answers ranging from "There is no CPAN for Python" and "We already
> have CPAN for Python" (confusing).

It confuses me that you call this "confusing".


> I'm wondering - is there any work being done identifying ..
>
> (1) what is so good with CPAN?
> (2) how can it be brought to the Python world?
>
> Is there a working group/initiative for this? Web page? Discussion group?

I think the right place to discuss any deficiencies of PyPI compared to 
CPAN is the distutils-sig mailing list.

Stefan



From python.list at tim.thechases.com  Wed Mar  3 07:55:54 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 03 Mar 2010 06:55:54 -0600
Subject: Interest check in some delicious syntactic sugar for "except:pass"
In-Reply-To: <35e00b331003030127y11b4964ev8c71417a2599eeec@mail.gmail.com>
References: <35e00b331003030127y11b4964ev8c71417a2599eeec@mail.gmail.com>
Message-ID: <4B8E5C5A.9020407@tim.thechases.com>

Oren Elrad wrote:
> I'm wondering if there is any support (tepid better than none) for the
> following syntactic sugar:
> 
> silence:
> ........ block
> 
> ------------------------->
> 
> try:
> ........block
> except:
> ........pass

The general response to "except: pass" from the Old Ones on the 
python list (and those younger ones who tend to prescribe good 
style) is a fairly immediate "don't use bare excepts".  So 
endorsing this "silence" syntax would be tantamount to condoning 
bare excepts.  I'm not sure you'll find much support.

http://www.google.com/search?q=site%3Amail.python.org+%22bare+excepts%22

(I've had problems with Google finding all posts to c.l.p on 
m.p.o recently, so this may only be a recent representative sample)

-tkc





From stefan_ml at behnel.de  Wed Mar  3 07:56:19 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 03 Mar 2010 13:56:19 +0100
Subject: Working group for Python CPAN-equivalence?
In-Reply-To: <hmlm1n$eqm$1@dough.gmane.org>
References: <c3dfe1d1003030445w29fd54b1t806fa8a75be978db@mail.gmail.com>
	<hmlm1n$eqm$1@dough.gmane.org>
Message-ID: <hmlm9k$eqm$2@dough.gmane.org>

Stefan Behnel, 03.03.2010 13:52:
> Olof Bjarnason, 03.03.2010 13:45:
>> The "Where is CPAN for Python?" question keeps popping up, with
>> answers ranging from "There is no CPAN for Python" and "We already
>> have CPAN for Python" (confusing).
>
> It confuses me that you call this "confusing".
>
>
>> I'm wondering - is there any work being done identifying ..
>>
>> (1) what is so good with CPAN?
>> (2) how can it be brought to the Python world?
>>
>> Is there a working group/initiative for this? Web page? Discussion group?
>
> I think the right place to discuss any deficiencies of PyPI compared to
> CPAN is the distutils-sig mailing list.

Ah, and the catalog-sig, if it's really related to the index rather than 
packages and package distribution.

Stefan



From olof.bjarnason at gmail.com  Wed Mar  3 07:59:00 2010
From: olof.bjarnason at gmail.com (Olof Bjarnason)
Date: Wed, 3 Mar 2010 13:59:00 +0100
Subject: Working group for Python CPAN-equivalence?
In-Reply-To: <hmlm1n$eqm$1@dough.gmane.org>
References: <c3dfe1d1003030445w29fd54b1t806fa8a75be978db@mail.gmail.com>
	<hmlm1n$eqm$1@dough.gmane.org>
Message-ID: <c3dfe1d1003030459o71a48da4hbc2d5a4995bdbd91@mail.gmail.com>

2010/3/3 Stefan Behnel <stefan_ml at behnel.de>:
> Olof Bjarnason, 03.03.2010 13:45:
>>
>> The "Where is CPAN for Python?" question keeps popping up, with
>> answers ranging from "There is no CPAN for Python" and "We already
>> have CPAN for Python" (confusing).
>
> It confuses me that you call this "confusing".

How come?

>
>
>> I'm wondering - is there any work being done identifying ..
>>
>> (1) what is so good with CPAN?
>> (2) how can it be brought to the Python world?
>>
>> Is there a working group/initiative for this? Web page? Discussion group?
>
> I think the right place to discuss any deficiencies of PyPI compared to CPAN
> is the distutils-sig mailing list.

Thanks.

>
> Stefan
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
http://olofb.wordpress.com


From ben+python at benfinney.id.au  Wed Mar  3 08:08:20 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 04 Mar 2010 00:08:20 +1100
Subject: Which mock library do you prefer?
References: <f3baba98-a0fc-4c6a-9fff-661da8356bc0@h2g2000yqj.googlegroups.com>
	<485b80f9-96c7-4946-8f38-44eb7d81fe1d@z19g2000yqk.googlegroups.com>
	<87sk90c499.fsf@benfinney.id.au>
	<e88f4781-4b1f-4a9d-8c61-3a13c854c280@d27g2000yqn.googlegroups.com>
	<kypi0m.i9s@spenarnc.xs4all.nl>
Message-ID: <87wrxtv9h7.fsf@benfinney.id.au>

Albert van der Horst <albert at spenarnc.xs4all.nl> writes:

> Unit testing is a concept that goes well with functions without side
> effects. If you have classes, that doesn't work so well.

How so? Unit tests are ideal for testing classes, in my experience; they
can be inspected and tested as a distinct unit of code.

> For classes use cases are the way to go.

That's a category error. Use cases are good for *functional* testing;
that is, testing of the system as a whole, with the focus on specific
uses to which the system needs to be put.

They're quite orthogonal. Neither interferes with the other. It's best
to have both.

> Think about it. The whole state of an object can affect the way a
> method works. So effectively for a unit test you have to put the
> object in a whole special fully controlled state.

That's right. This is called a ?test fixture?, and it's a central
concept of unit testing. There is explicit support in xUnit-style unit
test libraries (like Python's ?unittest?) for test fixtures.

-- 
 \     ?When I was a kid I used to pray every night for a new bicycle. |
  `\    Then I realised that the Lord doesn't work that way so I stole |
_o__)                   one and asked Him to forgive me.? ?Emo Philips |
Ben Finney


From lie.1296 at gmail.com  Wed Mar  3 08:09:20 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Thu, 04 Mar 2010 00:09:20 +1100
Subject: Docstrings considered too complicated
In-Reply-To: <pan.2010.03.03.05.48.49@REMOVE.THIS.cybersource.com.au>
References: <20100224212303.242222c6@geekmail.INVALID>	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>	<20100227191040.6c77f2d8@geekmail.INVALID>	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>	<20100301182255.3de59bc6@geekmail.INVALID>	<mailman.66.1267465347.23598.python-list@python.org>	<20100301212954.7aa0b99d@geekmail.INVALID>
	<87eik3zmi8.fsf@benfinney.id.au>	<20100302184056.743a71e7@geekmail.INVALID>	<mailman.129.1267553139.23598.python-list@python.org>	<20100302225156.67171851@geekmail.INVALID>
	<877hpuxpdf.fsf@benfinney.id.au>	<7v6ae4Ff37U1@mid.individual.net>
	<pan.2010.03.03.05.48.49@REMOVE.THIS.cybersource.com.au>
Message-ID: <4b8e5f9f$1@dnews.tpgi.com.au>

On 03/03/2010 04:48 PM, Steven D'Aprano wrote:
> Or one can simply use *reason*: what justification is there for putting 
> comments in strings at the top of the function? The only one I can see is 
> if you are writing for an embedded device, you may want to remove doc 
> strings to save memory -- and even that is implementation dependent.

Python already have a well-defined mechanism to remove docstrings with
the -O flag; there is really no other reason but plain ignorance and
inflexibility to think in other language than
<insert-your-first-language-here>.


From lie.1296 at gmail.com  Wed Mar  3 08:19:56 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Thu, 04 Mar 2010 00:19:56 +1100
Subject: There should be one-- and preferably only one --obvious way to
	do it (was "Interest check in some delicious syntactic sugar for
	"except:pass"")
In-Reply-To: <mailman.170.1267608442.23598.python-list@python.org>
References: <mailman.170.1267608442.23598.python-list@python.org>
Message-ID: <4b8e621b@dnews.tpgi.com.au>

On 03/03/2010 08:27 PM, Oren Elrad wrote:
> Howdy all, longtime appreciative user, first time mailer-inner.
> 
> I'm wondering if there is any support (tepid better than none) for the
> following syntactic sugar:
> 
> silence:
> ......... block
> 
> ------------------------->
> 
> try:
> .........block
> except:
> .........pass
> 
> The logic here is that there are a ton of "except: pass" statements[1]
> floating around in code that do not need to be there. Meanwhile, the
> potential keyword 'silence' does not appear to be in significant use
> as a variable[2], or an alternative keyword might be imagined
> ('quiet', 'hush', 'stfu') but I somewhat like the verbiness of
> 'silence' since that is precisely what it does to the block (that is,
> you have to inflect it as a verb, not a noun -- you are telling the
> block to be silent). Finally, since this is the purest form of
> syntactic sugar, I cannot fathom any parsing, interpreting or other
> complications that would arise.

Given that python HATE bare-except (and `pass`-block bare except is even
worse) and given python's idiosyncrasies "There should be one-- and
preferably only one --obvious way to do it", "Errors should never pass
silently"; the chance for `silence` keyword is precisely zero.

> I appreciate any feedback, including frank statements that you'd
> rather not trifle with such nonsense.

There are lots of reason why bare-except is bad, one being is that it
makes it way too easy to ignore errors that you don't actually want to
silence; and given that bare-excepts would prevent Ctrl+C (Interrupt)
from working. Sorry, but IMHO we shouldn't make syntax sugar for bad
practices.


From ben+python at benfinney.id.au  Wed Mar  3 08:21:14 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 04 Mar 2010 00:21:14 +1100
Subject: Working group for Python CPAN-equivalence?
References: <mailman.179.1267620332.23598.python-list@python.org>
Message-ID: <87r5o1v8vp.fsf@benfinney.id.au>

Olof Bjarnason <olof.bjarnason at gmail.com> writes:

> Hi everybody!
>
> The "Where is CPAN for Python?" question keeps popping up, with
> answers ranging from "There is no CPAN for Python" and "We already
> have CPAN for Python" (confusing).

Caused in no small measure by the fact that Perl people mean at least
two distinct things by ?Where is CPAN for Python??:

* The central package registry, CPAN, with metadata in a standard
  queryable format, and all registered packages redundantly mirrored and
  available for installation at user-specified versions.

  We have an equivalent in PyPI, though it's incomplete since many
  *registered* packages are not actually hosted *at* PyPI.

* The command-line tool, ?cpan?, used for performing operations on the
  set of locally-installed Perl packages, and for package maintainers
  performing operations on the repository.

  We have nothing like this. The Distutils library does a small part of
  the job, and the third-party ?easy_install? program works for those
  which use the Setuptools extensions; but there's nothing at all
  equivalent to Perl's ?cpan? tool.

Often, Perl people asking simply ?Where is CPAN for Python?? are asking
about a third thing:

* The unified, mature, actively-maintained, seamless combination of the
  CPAN repository and the ?cpan? tool, that work together as a single
  reliable system to such an extent that one can sensibly talk about
  them *both* as one thing, ?CPAN?.

  This one we're a *long* way from with Python, IMO. Much work has been
  going on over the last year or so, and it's encouraging to see; but so
  much of that work is dealing with the legacy burden of Distutils that
  I get weary seeing how far there is to go.

-- 
 \         ?A child of five could understand this. Fetch me a child of |
  `\                                              five.? ?Groucho Marx |
_o__)                                                                  |
Ben Finney


From zhushazang at yahoo.com.br  Wed Mar  3 08:32:30 2010
From: zhushazang at yahoo.com.br (Zhu Sha Zang)
Date: Wed, 03 Mar 2010 10:32:30 -0300
Subject: Eric4 vs Python3.1
Message-ID: <4B8E64EE.9040707@yahoo.com.br>

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Someone using Eric4 to program with Python3/3.1?

What can i do, because he insist to use only Python2.6.4.

Att
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.14 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/

iEYEARECAAYFAkuOZO4ACgkQ35zeJy7JhCjdFACfZrjVa+8O9fu/7FEPr6mVeaEg
Rm0AmgM+XtuxFH1zUnfkaphF+MgPy3pf
=MVeJ
-----END PGP SIGNATURE-----


From tibor.beck at hotmail.com  Wed Mar  3 08:45:27 2010
From: tibor.beck at hotmail.com (gentlestone)
Date: Wed, 3 Mar 2010 05:45:27 -0800 (PST)
Subject: monkey patching with @classmethod
References: <b4ecc2a9-0ef4-43fa-999d-fdfb23b2ee4f@c16g2000yqd.googlegroups.com>
	<4b8e5161$0$23009$426a74cc@news.free.fr>
Message-ID: <0b3928bb-04e6-402a-9842-680b621ae256@x22g2000yqx.googlegroups.com>

On 3. Mar., 13:09 h., Bruno Desthuilliers <bruno.
42.desthuilli... at websiteburo.invalid> wrote:
> gentlestone a ?crit :
>
>
>
> > Hi, is there some well-known problems with class method monkey
> > patching?
>
> > I've got this error message:
>
> > unbound method get_pocet_neocislovanych() must be called with Pozemok
> > instance as first argument (got Subjekt instance instead)
> > The method is declared as:
> > @classmethod
> > @monkeypatch(Dokument)
> > def get_pocet_neocislovanych(cls, subjekt):
> > ? ? return cls.objects.filter(subjekt = subjekt, cislo__isnull =
> > True).count() # or pass, this line is not important
>
> > and the monkey patch decorator is declared as:
> > def monkeypatch(cls):
> > ? ? def decorator(func):
> > ? ? ? ? setattr(cls, func.__name__, func)
> > ? ? ? ? return func
> > ? ? return decorator
>
> The decorators are applied in order. So you first add the yet
> undecorated function as an attribute of the class, then pass the
> function to classmethod.
>
> FWIW, this monkeypatch decorator is IMHO a plain waste of time. The
> following code does the same thing and is (IMHO again) *much* more readable:
>
> def get_pocet_neocislovanych(cls, subjekt):
> ? ? ? return cls.objects.filter(
> ? ? ? ? ?subjekt=subjekt,
> ? ? ? ? ?cislo__isnull= True
> ? ? ? ? ?).count() # or pass, this line is not important
>
> Dokument.get_pocet_neocislovanych=@classmethod(get_pocet_neocislovanych)
>
> Also, Django's BestPractice(tm) is to define such "query" methods on the
> ? model's manager, not as a classmethod of the model.
>
> My 2 cents

thx, I changed my definitions to manager style and have no more
problems

seems to be safe to use manager instead classmethod - do not know
why :-)


From benjamin.kaplan at case.edu  Wed Mar  3 08:48:37 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 3 Mar 2010 08:48:37 -0500
Subject: Re Interest check in some delicious syntactic sugar for 
	"except:pass"
In-Reply-To: <35e00b331003030347x30f3f2faua96a9b72814743da@mail.gmail.com>
References: <35e00b331003030347x30f3f2faua96a9b72814743da@mail.gmail.com>
Message-ID: <ec96e1391003030548w3eb2544auc795a5d44a803720@mail.gmail.com>

On Wed, Mar 3, 2010 at 6:47 AM, Oren Elrad <orenelrad at gmail.com> wrote:

> To all that responded, thanks for the prompt response folks, your
> criticisms are well taken. Coming from Cland, one is inculcated with
> the notion that if the programmer wants to shoot himself in the foot
> the language ought not to prevent that (or even should return him a
> loaded magnum with the safety off and the hair-trigger pulled). My
> apologies for not immediately grokking the cultural difference in
> pytown.
>
> With that said, let me at least offer a token defense of my position.
> By way of motivation, I wrote that email after copying/pasting the
> following a few times around a project until I wrote it into def
> SilentlyDelete() and its cousin SilentlyRmdir()
>
> """ code involving somefile """
> try:
> ........os.remove(somefile)
> except:
> .......pass     # The bloody search indexer has got the file and I
> can't delete it. Nothing to be done.
>
> Certainly the parade of horribles (bad files! corrupt data! syntax
> errors!) is a tad melodramatic. Either os.remove() succeeds or it
> doesn't and the execution path (in the estimation of this programmer,
> at least) is not at all impacted by whether it succeeds or fails. I
> know with certainty at compile time what exceptions might be raised
> and what the consequences of passing them are and there is no sense
> pestering the user or sweating over it. Nor can I see the logic, as
> was suggested, in writing "except OSError:" since (seems to me) mere
> surplusage -- it neither causes a semantic difference in the way the
> program runs nor provides anything useful to the reader.
>
>
What if the user presses Ctrl-C to try to quit the program? Your bare except
is catching the KeyboardInterrupts and ignoring them.
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From desktopsbyduck at gmail.com  Wed Mar  3 08:49:34 2010
From: desktopsbyduck at gmail.com (RICHARD MOORE)
Date: Wed, 3 Mar 2010 05:49:34 -0800 (PST)
Subject: RICHARD MOORE wants to stay in touch on LinkedIn
Message-ID: <1313196773.7301341.1267624174377.JavaMail.app@ech3-cdn11.prod>

LinkedIn
------------
   
I'd like to add you to my professional network on LinkedIn.

- RICHARD MOORE

Confirm that you know RICHARD MOORE
https://www.linkedin.com/e/isd/1117171902/jlHq1JKw/EML-invg_56/


 
------
(c) 2010, LinkedIn Corporation
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From desktopsbyduck at gmail.com  Wed Mar  3 08:50:07 2010
From: desktopsbyduck at gmail.com (RICHARD MOORE)
Date: Wed, 3 Mar 2010 05:50:07 -0800 (PST)
Subject: RICHARD MOORE wants to stay in touch on LinkedIn
Message-ID: <1916304926.7302790.1267624207959.JavaMail.app@ech3-cdn11.prod>

LinkedIn
------------
   
I'd like to add you to my professional network on LinkedIn.

- RICHARD MOORE

Confirm that you know RICHARD MOORE
https://www.linkedin.com/e/isd/1117171902/jlHq1JKw/EML-invg_56/


 
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From yyfgv at yahoo.com.ar  Wed Mar  3 09:00:16 2010
From: yyfgv at yahoo.com.ar (Publicidad para Todos)
Date: 03 Mar 2010 11:00:16 -0300
Subject: Tu mailing llega ahora a todos lados
Message-ID: <20100303105936.0C607419FF28A41A@yahoo.com.ar>

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From fetchinson at googlemail.com  Wed Mar  3 09:33:30 2010
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Wed, 3 Mar 2010 15:33:30 +0100
Subject: Re Interest check in some delicious syntactic sugar for 
	"except:pass"
In-Reply-To: <35e00b331003030347x30f3f2faua96a9b72814743da@mail.gmail.com>
References: <35e00b331003030347x30f3f2faua96a9b72814743da@mail.gmail.com>
Message-ID: <fbe2e2101003030633j63fccf4n1274d7f8d2691ac1@mail.gmail.com>

> By way of motivation, I wrote that email after copying/pasting the
> following a few times around a project until I wrote it into def
> SilentlyDelete() and its cousin SilentlyRmdir()
>
> """ code involving somefile """
> try:
> ........os.remove(somefile)
> except:
> .......pass     # The bloody search indexer has got the file and I
> can't delete it. Nothing to be done.

You just found the right solution: define a function for something
that you do repeatedly. No need to change the language.

Cheers,
Daniel



-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From subhakolkata1234 at gmail.com  Wed Mar  3 09:36:23 2010
From: subhakolkata1234 at gmail.com (joy99)
Date: Wed, 3 Mar 2010 06:36:23 -0800 (PST)
Subject: Few early questions on Class
Message-ID: <24aeb097-6376-46b8-a3ff-df4a04d49a3c@y7g2000prc.googlegroups.com>

Dear Group,

I was practising some early example of class if you can kindly let me
know where I was going wrong.

I am pasting directly from IDLE. There may be slight indentation
problem. I am using Python 2.6.4 on Windows XP Service Pack 3.

The Code and the output:

>>> class Student:
	def _init_(self,name):
		self.name=name
		self.attendance=0
		self.marks=[]
		number_of_marks=len(self.marks)
		print number_of_marks


>>> b=Student("Bobby")

Traceback (most recent call last):
  File "<pyshell#9>", line 1, in <module>
    b=Student("Bobby")
TypeError: this constructor takes no arguments
>>> Class Shape:

SyntaxError: invalid syntax
>>> class Shape:
	def _init_(self,x,y):
		self.x=x
		self.y=y
		description="This Shape is not been described Yet"
		author="Nobody has Claimed it Yet"
		def area(self):
			return self*x+self*y
		def perimeter(self):
			return 2*self.x+2*self*y


>>> rectangle=Shape(100,45)

Traceback (most recent call last):
  File "<pyshell#22>", line 1, in <module>
    rectangle=Shape(100,45)
TypeError: this constructor takes no arguments
>>> rectangle=Shape()
>>> print rectangle.area()

Traceback (most recent call last):
  File "<pyshell#24>", line 1, in <module>
    print rectangle.area()
AttributeError: Shape instance has no attribute 'area'
>>>
Best Regards,
Subhabrata.


From pranav.choudhary at gmail.com  Wed Mar  3 09:41:25 2010
From: pranav.choudhary at gmail.com (pranav)
Date: Wed, 3 Mar 2010 06:41:25 -0800 (PST)
Subject: save CRL to a file (M2Crypto.X509.CRL object)
Message-ID: <c81406ec-9560-4c9f-8dd5-0a3c895ae771@k36g2000prb.googlegroups.com>

I do not see an option to save M2Crypto.X509.CRL object to a file. Am
I overlooking something?

Thanks


From python at mrabarnett.plus.com  Wed Mar  3 09:42:00 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 03 Mar 2010 14:42:00 +0000
Subject: Docstrings considered too complicated
In-Reply-To: <7v695nFa0fU1@mid.individual.net>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>	<4B8B9845.70604@sequans.com>	<mailman.59.1267456634.23598.python-list@python.org>
	<7v695nFa0fU1@mid.individual.net>
Message-ID: <4B8E7538.2080003@mrabarnett.plus.com>

Gregory Ewing wrote:
> MRAB wrote:
> 
>> BTW, the first programming I did was in hexadecimal (C4xx was "LDI xx").
> 
> Hey, a SC/MP! That was my first programming language,
> too. What sort of machine was it in?
> 
Mk14 from Science of Cambridge, a kit with hex keypad and 7-segment
display, which I had to solder together, and also make my own power
supply. I had the extra RAM and the I/O chip, so that's 256B (including
the memory used by the monitor) + 256B additional RAM + 128B more in the
I/O chip.


From jmg3000 at gmail.com  Wed Mar  3 09:42:24 2010
From: jmg3000 at gmail.com (John Gabriele)
Date: Wed, 3 Mar 2010 06:42:24 -0800 (PST)
Subject: Few early questions on Class
References: <24aeb097-6376-46b8-a3ff-df4a04d49a3c@y7g2000prc.googlegroups.com>
Message-ID: <7277b1d5-e1b5-4afc-a9a4-9e45e9e4ff80@z11g2000yqz.googlegroups.com>

Hi Subhabrata,

s/_init_/__init__/


From python at mrabarnett.plus.com  Wed Mar  3 09:45:06 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 03 Mar 2010 14:45:06 +0000
Subject: case do problem
In-Reply-To: <7v6cviFq18U1@mid.individual.net>
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>	<hmjjnn$arj$1@news.eternal-september.org>
	<7v6cviFq18U1@mid.individual.net>
Message-ID: <4B8E75F2.8090608@mrabarnett.plus.com>

Gregory Ewing wrote:
> Alf P. Steinbach wrote:
>> * Tracubik:
>  >
>>> iterations=0;
>>> count=0;
>>> REPEAT;
>>>   iterations = iterations+1;
>>>   ...
>>>   IF (genericCondition) THEN count=count+1;
>>>   ...
>>>   CASE count OF:
>>>     1: m = 1
>>>         2: m = 10
>>>         3: m = 100
>>
>> Uhm, is this syntactically valid Pascal? As I recall, every Pascal 
>> construct was delimited in some way.
> 
> I think it's okay. Pascal's control structures such as
> if-then and while-do mostly take single statements and
> didn't have an ending keyword. If you want multiple
> statements in the body you have to put begin-end around
> them.
> 
> Putting a semicolon after REPEAT is stylistically a
> bit odd, but it's not wrong.
> 
There shouldn't be a colon after the 'OF', and the cases themselves
should be separated by semicolons (the case-statement itself ends with
'end').


From python.list at tim.thechases.com  Wed Mar  3 09:49:27 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 03 Mar 2010 08:49:27 -0600
Subject: Re Interest check in some delicious syntactic sugar for
	"except:pass"
In-Reply-To: <35e00b331003030347x30f3f2faua96a9b72814743da@mail.gmail.com>
References: <35e00b331003030347x30f3f2faua96a9b72814743da@mail.gmail.com>
Message-ID: <4B8E76F7.20809@tim.thechases.com>

Oren Elrad wrote:
> """ code involving somefile """
> try:
> ........os.remove(somefile)
> except:
> .......pass     # The bloody search indexer has got the file and I
> can't delete it. Nothing to be done.


I admit there are times I've done something similar, usually with 
what I call my "int0" and "float0" utility functions which 
roughly translate to "give me a stinkin' int/float and if 
something goes wrong, give me 0, but the return result better 
darn well be an int/float!" functions.  But as you describe and 
was later commended as a right-ish way to approach it, 
abstracting that off into a function with minimal code in the 
try: block is the right way to go.

-tkc


def int0(v):
   """converts v to a int, or returns 0 if it can't"""
   try:
     return int(v)
   except: # usually a ValueError but catch all cases
     try:
       # int("1.1") fails so try float()ing it first
       return int(round(float(v)))
     except:
       return 0

def float0(v):
   """converts v to a float, or returns 0 if it can't"""
   try:
     return float(v)
   except:
     return 0.0






From electriclightheads at gmail.com  Wed Mar  3 09:50:09 2010
From: electriclightheads at gmail.com ('2+)
Date: Wed, 3 Mar 2010 23:50:09 +0900
Subject: pyao makes the right sound but why?
Message-ID: <1078018b1003030650g499e4a7bvfaab763be485755c@mail.gmail.com>

with my soy.py

tofu = soy.Bean()
x = tofu.pattern(44100 * 3)

creates x which is an array('h') and len(x) = 44100 * 6
this x is a stereo groove pattern that lasts 3 sec if samplerate is set to 44100
and since wave.py could save it to a_file.wav
i was wondering if

dev = ao.AudioDevice('alsa')
dev.play(x)

could launch me a semi realtime dj kinda sys
luckily .. it does seem to be making the right sound
but why?
the default of the samplerate and that 16bit happened to match with my thing x?
o but if i do

dev.play(x, len(x))

it only plays the half of the pattern
and

dev.play(x, 2 * len(x))

does the right thing

and the 2nd 4th 6th .. play gives me

ALSA underrun, at least 0ms

3rd, 5th, 7th does it fine

/usr/share/doc/python-pyao
doesn't teach me the answer
does somebody know more about pyao?

-- 
SaRiGaMa's Oil Vending Orchestra
is podcasting:
http://sarigama.namaste.jp/podcast/rss.xml


From spamfresser at ch3ka.de  Wed Mar  3 09:50:19 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Wed, 03 Mar 2010 15:50:19 +0100
Subject: Re Interest check in some delicious syntactic sugar for
	"except:pass"
In-Reply-To: <mailman.178.1267616851.23598.python-list@python.org>
References: <mailman.178.1267616851.23598.python-list@python.org>
Message-ID: <hmlsvf$mrn$1@news.urz.uni-heidelberg.de>

Am 03.03.2010 12:47, schrieb Oren Elrad:
> """ code involving somefile """
> try:
> ........os.remove(somefile)
> except:
> .......pass     # The bloody search indexer has got the file and I
> can't delete it. Nothing to be done.

You don't know that what you stated in your comment is true.
All you know is that there was an exception. To find the reason, you 
have to inspect the exception.
You escpecially do NOT know whether the file is removed or not.

OK, os.remove() might be a CPython builtin (not sure ATM), but in 
general all sort of crazy things can happen here, like ImportError 
raised by code in the lib or so.
And of course: a bare except: also catches ^C or SystemExit. That is 
almost certainly *not* what you want, right?

To your first question about a "silenced" keyword: you could emulate 
this with context managers I guess.

Something like (untested, just a quick mockup how it could look):



class silenced:
	def __init__(self, *silenced):
		self.exceptions=tuple(silenced) #just to be explicit
	def __enter__(self):
		return self			#dito1
	def __exit__(self, type, value, traceback):
		for ex in self.exceptions:
			if isinstance(value, ex):
				return True #supresses exception


So:

with silenced(os.Error):
	os.remove(somefile)

Would translate to:

try:
	os.remove(somefile)
except os.Error:
	pass

One nice thing about this approach would be that you can alias a set of 
exceptions with this:

idontcareabouttheseerrors=silenced(TypeError, ValueError, PEBCAKError, 
SyntaxError, EndOfWorldError, 1D10T_Error)

with idontcareabouttheseerrors:
	do_stuff()

Regards,
Michael


From michaelveloz at gmail.com  Wed Mar  3 09:57:56 2010
From: michaelveloz at gmail.com (Veloz)
Date: Wed, 3 Mar 2010 06:57:56 -0800 (PST)
Subject: Queue peek?
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>
	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com> 
	<58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com> 
	<mailman.138.1267559095.23598.python-list@python.org>
	<hmjqkr$r46$1@news.eternal-september.org> 
	<eae285401003021233i7a62771h590a557341f10ca4@mail.gmail.com> 
	<hmk1er$mlb$1@dough.gmane.org>
	<1267567723.4101.28.camel@localhost.localdomain> 
	<mailman.156.1267578012.23598.python-list@python.org>
	<7v6cf4FnnrU1@mid.individual.net>
Message-ID: <8bbd0a04-9a13-4f36-91c7-80f07bee0952@y17g2000yqd.googlegroups.com>

On Mar 3, 1:14?am, Gregory Ewing <greg.ew... at canterbury.ac.nz> wrote:
> MRAB wrote:
> > I suppose it depends on the complexity of the data structure. A dict's
> > methods are threadsafe, for example, but if you have a data structure
> > where access leads to multiple method calls then collectively they need
> > a lock.
>
> It also depends on the nature of the objects being used
> as dict keys. Dict operations invoke the hashing and
> comparison methods of the keys, which in general can
> execute arbitrary Python code.
>
> If the keys are elementary built-in types such as
> strings or ints, then dict operations will *probably*
> be atomic. But I think I'd use a lock anyway, to be
> on the safe side.
>
> --
> Greg

Unless I missed where you guys were going, I think we got off the main
point. The main question at hand was this: what's the best way (heck,
any way) to implement a sort of "peek" whereby a number of processes
can write results to some common "object" and some other process can
"peek" into this object, looking for specific items they're interested
in?

I've tried doing this with a queue, as follows: children all write
results to queue, each result has an identifier.  Another interested
party, which wants to know if identifier XXX has been placed in the
queue, removes all the items, one by one from the queue, "keeps" the
one matching the identifier (if found) and puts the rest of the items
back on the queue, so other interested parties can also look through
it.

This is not a good solution, but it illustrates what I'm trying to
achieve..

I'm looking at multiprocessing.Manager, ctypes, etc, but nothing's
really jumped out.

I also tried creating my own list class which uses locks to provide a
"peek and remove" method, but I don't have a good way to share an
instance of this object across processes.

Any thoughts would be welcomed!
Michael


From jjposner at optimum.net  Wed Mar  3 09:58:46 2010
From: jjposner at optimum.net (John Posner)
Date: Wed, 03 Mar 2010 09:58:46 -0500
Subject: Method / Functions - What are the differences?
In-Reply-To: <4b8e4041$0$17447$426a34cc@news.free.fr>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>	<4b8c2a34$0$10470$426a74cc@news.free.fr>	<mailman.81.1267492052.23598.python-list@python.org>	<4b8cd310$0$4604$426a34cc@news.free.fr>	<mailman.109.1267539415.23598.python-list@python.org>	<hmk1mn$70u$1@newsreader3.netcologne.de>
	<4b8e4041$0$17447$426a34cc@news.free.fr>
Message-ID: <hmlte9$d0f$1@dough.gmane.org>

On 3/3/2010 5:56 AM, Bruno Desthuilliers wrote:
> Eike Welk a ?crit :
>> John Posner wrote:
>>> I've updated the text at this location:
>>>
>>> > http://cl1p.net/bruno_0301.rst/
>>
>> I think this is a very useful writeup!
>> It would be perfect with a little bit of introduction that says:
>> 1. - What it is: "The rough details of method look-up";
>> 2. - which contains some of the questions that that made that authors
>> write the text. This way people with similar questions can find it
>> with Google.
>>
>
> John, do you think you could something with the following ?

Sure thing, Bruno. I'll incorporate/edit your new text below into a 
Python Wiki entry. The headings in the Documentation table of contents 
page (http://wiki.python.org/moin/Documentation) seem pretty sober, so I 
plan to use a straightforward title:

   FromFunctionsToMethods

... instead of the clearly superior ...

   ItsAFunctionItsAMethodItsAUseOfTheDescriptorProtocol

Does this article belong in the "Advanced Topics" section of the page? 
I'm not sure, but I'll place it there for now. (Alternative suggestions 
welcome!)

>
> """
> "Is it a function ? is it a method ? No, it's... " - or : What's in a
> Python method ?
>
> Python newcomers often have hard time understanding the "magic" behind
> Python's methods - and truth is that Python's object model can be a bit
> peculiar when compared to most mainstream (or not-so-mainstream) OOPLs.
> As a matter of fact, there are quite a few threads on c.l.py with either
> direct or indirect questions about what makes a Python method, and I
> must have explained the whole mechanism at least 3 or 4 times there. The
> following text is an edited version of my last attempt, as edited,
> corrected and published by John Posner, MayHisNameBePraised(tm).
>
> This text isn't meant as a replacement for neither the official
> FineManual(tm)[XXX : relevant link] nor the very excellent - if somehow
> technical - 'Descriptors how-to' [XXX : relevant link]. It's mostly a
> brief but hopefully helpful overview of what exactly is a Python method,
> and how Python magically inserts the 'self' or 'cls' argument to method
> calls.
> """
>
> Feel free to edit / amend / rewrite / trash at will - you're now
> officially in charge of publishing this text !-)
>

Yow, the mantle of responsibility weighs heavily upon my poor shoulders!

Film at 11,
John



From jmg3000 at gmail.com  Wed Mar  3 10:04:08 2010
From: jmg3000 at gmail.com (John Gabriele)
Date: Wed, 3 Mar 2010 07:04:08 -0800 (PST)
Subject: Working group for Python CPAN-equivalence?
References: <mailman.179.1267620332.23598.python-list@python.org>
Message-ID: <67f0da3c-9c4d-4080-8821-3acbfada1d4f@o30g2000yqb.googlegroups.com>

On Mar 3, 7:45?am, Olof Bjarnason <olof.bjarna... at gmail.com> wrote:
> Hi everybody!
>
> The "Where is CPAN for Python?" question keeps popping up, with
> answers ranging from "There is no CPAN for Python" and "We already
> have CPAN for Python" (confusing).
>
> I'm wondering - is there any work being done identifying ..
>
> (1) what is so good with CPAN?
> (2) how can it be brought to the Python world?
>
> Is there a working group/initiative for this? Web page? Discussion group?

Hi Olof,

Discussions about that often take place on the distutils-sig and
catalog-sig MLs.

People are currently working on making the Cheeseshop even better and
the situation is improving. Have a look at [Tarek's blog](http://
tarekziade.wordpress.com/) for more info.

---John


From invalid at invalid.invalid  Wed Mar  3 10:05:54 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Wed, 3 Mar 2010 15:05:54 +0000 (UTC)
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <kyoevn.k63@spenarnc.xs4all.nl>
	<hmk60h$nce$1@reader1.panix.com> <7v69rcFcmeU1@mid.individual.net>
Message-ID: <hmltsi$jcd$1@reader1.panix.com>

On 2010-03-03, Gregory Ewing <greg.ewing at canterbury.ac.nz> wrote:
> Grant Edwards wrote:
>
>> Just a mediocre copy of the CP/M filesystem, which was in turn
>> copied from DEC's RSTS or RSX.
>
> It was actually an improvement over CP/M's file
> system. CP/M didn't have hierarchical directories

Neither did the original MS-DOS filesystem.

> or timestamps and recorded file sizes in 128-byte blocks
> rather than bytes.

I thought that was true of the original MS-DOS filesystem as
well, but I wouldn't bet money on it.

-- 
Grant Edwards               grant.b.edwards        Yow! I like the way ONLY
                                  at               their mouths move ...  They
                              gmail.com            look like DYING OYSTERS


From jmg3000 at gmail.com  Wed Mar  3 10:10:07 2010
From: jmg3000 at gmail.com (John Gabriele)
Date: Wed, 3 Mar 2010 07:10:07 -0800 (PST)
Subject: cpan for python?
References: <mailman.20.1267367545.23598.python-list@python.org> 
	<hmjv4b$mqk$1@reader1.panix.com>
	<2010030214473616807-tomfsessile@gmailcom> 
	<4b8ddea4$1@dnews.tpgi.com.au> <87ljea9f20.fsf@castleamber.com>
Message-ID: <45b1599f-a05b-4132-9e75-89a52757e71b@q21g2000yqm.googlegroups.com>

On Mar 2, 11:58?pm, John Bokma <j... at castleamber.com> wrote:
> Lie Ryan <lie.1... at gmail.com> writes:
> > On 03/03/2010 09:47 AM, TomF wrote:
>
> [..]
>
> >> There
> >> is also a program called cpan, distributed with Perl. ?It is used for
> >> searching, downloading, installing and testing modules from the CPAN
> >> repository. ?It's far more extensive than setuptools. ?AFAIK the python
> >> community has developed nothing like it.
>
> > python have easy_install
>
> How easy is it to /remove/ something? ;-) (Last time I checked I read
> something like "manually remove the .egg"...
>

Have a look at [pip](http://cheeseshop.python.org/pypi/pip). It should
support uninstalling packages.

---John


From alfps at start.no  Wed Mar  3 10:10:26 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 03 Mar 2010 16:10:26 +0100
Subject: A "scopeguard" for Python
Message-ID: <hmlu55$n1s$1@news.eternal-september.org>

For C++ Petru Marginean once invented the "scope guard" technique (elaborated on 
by Andrei Alexandrescu, they published an article about it in DDJ) where all you 
need to do to ensure some desired cleanup at the end of a scope, even when the 
scope is exited via an exception, is to declare a ScopeGuard w/desired action.

The C++ ScopeGuard was/is for those situations where you don't have proper 
classes with automatic cleanup, which happily is seldom the case in good C++ 
code, but languages like Java and Python don't support automatic cleanup and so 
the use case for something like ScopeGuard is ever present.

For use with a 'with' statement and possibly suitable 'lambda' arguments:


<code>
class Cleanup:
     def __init__( self ):
         self._actions = []

     def call( self, action ):
         assert( is_callable( action ) )
         self._actions.append( action )

     def __enter__( self ):
         return self

     def __exit__( self, x_type, x_value, x_traceback ):
         while( len( self._actions ) != 0 ):
             try:
                 self._actions.pop()()
             except BaseException as x:
                 raise AssertionError( "Cleanup: exception during cleanup" ) from
</code>


I guess the typical usage would be what I used it for, a case where the cleanup 
action (namely, changing back to an original directory) apparently didn't fit 
the standard library's support for 'with', like

   with Cleanup as at_cleanup:
       # blah blah
       chdir( somewhere )
       at_cleanup.call( lambda: chdir( original_dir ) )
       # blah blah

Another use case might be where one otherwise would get into very deep nesting 
of 'with' statements with every nested 'with' at the end, like a degenerate tree 
that for all purposes is a list. Then the above, or some variant, can help to 
/flatten/ the structure. To get rid of that silly & annoying nesting. :-)


Cheers,

- Alf (just sharing, it's not seriously tested code)


From spamfresser at ch3ka.de  Wed Mar  3 10:15:27 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Wed, 03 Mar 2010 16:15:27 +0100
Subject: Is this secure?
In-Reply-To: <4b8ddcf6$1@dnews.tpgi.com.au>
References: <mailman.110.1266935711.4577.python-list@python.org>	<7xtyt72200.fsf@ruckus.brouhaha.com>	<d8a401bf-6dfa-4e41-bea0-8cbf12f8d6e0@o3g2000vbo.googlegroups.com>	<7x3a0r8hyr.fsf@ruckus.brouhaha.com>	<mailman.169.1267032213.4577.python-list@python.org>	<hm3p7l$hr$1@news.urz.uni-heidelberg.de>	<hm3rgu$kvd$1@dough.gmane.org>	<hm3t1f$qbj$1@dough.gmane.org>
	<mailman.187.1267039205.4577.python-list@python.org>
	<4b8ddcf6$1@dnews.tpgi.com.au>
Message-ID: <hmluek$n0q$1@news.urz.uni-heidelberg.de>

Am 03.03.2010 04:51, schrieb Lie Ryan:
> import itertools
> def gen():
>      valid_chars = 'abcdefghijklmnopqrstuvwxyz'
>      for char in itertools.repeat(valid_chars):
>          yield char
>
> gen = gen()
> def gen_rand_string(length):
>      chars = (next(gen) for i in range(length))
>      return ''.join(chars)
>
> since it gives me a perfect distribution of letters,

It does not. Only if not (length(valid_chars) % length)

Regards,
Michael


From redazione at italiainweekend.it  Wed Mar  3 10:18:23 2010
From: redazione at italiainweekend.it (ItaliaWeekend)
Date: Wed, 3 Mar 2010 16:18:23 +0100
Subject: PAGINE DI UNA ITALIA MERAVIGLIOSA
Message-ID: <01f6f7b5$40240$efa56794340972@pavillon-pc>

An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20100303/5349480d/attachment-0001.html>

From python at mrabarnett.plus.com  Wed Mar  3 10:19:56 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 03 Mar 2010 15:19:56 +0000
Subject: Interest check in some delicious syntactic sugar for "except:pass"
In-Reply-To: <35e00b331003030127y11b4964ev8c71417a2599eeec@mail.gmail.com>
References: <35e00b331003030127y11b4964ev8c71417a2599eeec@mail.gmail.com>
Message-ID: <4B8E7E1C.7090002@mrabarnett.plus.com>

Oren Elrad wrote:
> Howdy all, longtime appreciative user, first time mailer-inner.
> 
> I'm wondering if there is any support (tepid better than none) for the
> following syntactic sugar:
> 
> silence:
> ........ block
> 
> ------------------------->
> 
> try:
> ........block
> except:
> ........pass
> 
> The logic here is that there are a ton of "except: pass" statements[1]
> floating around in code that do not need to be there. Meanwhile, the
> potential keyword 'silence' does not appear to be in significant use
> as a variable[2], or an alternative keyword might be imagined
> ('quiet', 'hush', 'stfu') but I somewhat like the verbiness of
> 'silence' since that is precisely what it does to the block (that is,
> you have to inflect it as a verb, not a noun -- you are telling the
> block to be silent). Finally, since this is the purest form of
> syntactic sugar, I cannot fathom any parsing, interpreting or other
> complications that would arise.
> 
> I appreciate any feedback, including frank statements that you'd
> rather not trifle with such nonsense.
> 
> ~Oren
> 
> [1] http://www.google.com/codesearch?q=except%3A\spass&hl=en
> [2] http://www.google.com/codesearch?hl=en&lr=&q=silence+lang%3Apy

Bare excepts are a very bad idea. And you want syntactic sugar for them?

Aargh! :-)


From invalid at invalid.invalid  Wed Mar  3 10:30:36 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Wed, 3 Mar 2010 15:30:36 +0000 (UTC)
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <kyoevn.k63@spenarnc.xs4all.nl>
	<hmk60h$nce$1@reader1.panix.com> <7v69rcFcmeU1@mid.individual.net>
	<hmltsi$jcd$1@reader1.panix.com>
Message-ID: <hmlvas$2a6$1@reader1.panix.com>

On 2010-03-03, Grant Edwards <invalid at invalid.invalid> wrote:
> On 2010-03-03, Gregory Ewing <greg.ewing at canterbury.ac.nz> wrote:
>> Grant Edwards wrote:
>>
>>> Just a mediocre copy of the CP/M filesystem, which was in turn
>>> copied from DEC's RSTS or RSX.
>>
>> It was actually an improvement over CP/M's file system. CP/M
>> didn't have hierarchical directories
>
> Neither did the original MS-DOS filesystem.
>
>> or timestamps and recorded file sizes in 128-byte blocks
>> rather than bytes.
>
> I thought that was true of the original MS-DOS filesystem as
> well, but I wouldn't bet money on it.

I definitely remember that old MS-DOS programs would treat
Ctrl-Z as an EOF marker when it was read from a text file and
would terminate a text file with a Ctrl-Z when writing one.

I don't know if that was because the underlying filesystem was
still did everything in blocks or if it was because those
MS-DOS programs were direct ports of CP/M programs.  I would
have sworn that the orignal MS-DOS file API was FCB based and
worked almost exactly like CP/M.  IIRC, the "byte stream" API
showed up (in the OS) sever versions later.  The byte stream
API was implemented by many compiler vendor's C libraries on
top of the block-oriented FCB API.

-- 
Grant Edwards               grant.b.edwards        Yow! I had a lease on an
                                  at               OEDIPUS COMPLEX back in
                              gmail.com            '81 ...


From mrmakent at gmail.com  Wed Mar  3 10:39:05 2010
From: mrmakent at gmail.com (Mike Kent)
Date: Wed, 3 Mar 2010 07:39:05 -0800 (PST)
Subject: A "scopeguard" for Python
References: <hmlu55$n1s$1@news.eternal-september.org>
Message-ID: <57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>

What's the compelling use case for this vs. a simple try/finally?

   original_dir = os.getcwd()
   try:
       os.chdir(somewhere)
       # Do other stuff
   finally:
       os.chdir(original_dir)
       # Do other cleanup


From efruttero at hotmail.com  Wed Mar  3 10:40:48 2010
From: efruttero at hotmail.com (efruttero at hotmail.com)
Date: Wed, 3 Mar 2010 07:40:48 -0800 (PST)
Subject: Smalltalk-like categories for methods ?
Message-ID: <8f66e5eb-3dda-4f7a-b607-cd7f2ea0e16b@c16g2000yqd.googlegroups.com>

Hello,

Is there an IDE that supports methods categories/classification,
either through some comment convention, annotation, or any other
mean ?


Thanks in advance,

Eric Fruttero



From steve at holdenweb.com  Wed Mar  3 10:42:20 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 03 Mar 2010 10:42:20 -0500
Subject: Queue peek?
In-Reply-To: <8bbd0a04-9a13-4f36-91c7-80f07bee0952@y17g2000yqd.googlegroups.com>
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>
	<58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>
	<mailman.138.1267559095.23598.python-list@python.org>	<hmjqkr$r46$1@news.eternal-september.org>
	<eae285401003021233i7a62771h590a557341f10ca4@mail.gmail.com>
	<hmk1er$mlb$1@dough.gmane.org>	<1267567723.4101.28.camel@localhost.localdomain>
	<mailman.156.1267578012.23598.python-list@python.org>	<7v6cf4FnnrU1@mid.individual.net>
	<8bbd0a04-9a13-4f36-91c7-80f07bee0952@y17g2000yqd.googlegroups.com>
Message-ID: <hmm00u$mk0$1@dough.gmane.org>

Veloz wrote:
> On Mar 3, 1:14 am, Gregory Ewing <greg.ew... at canterbury.ac.nz> wrote:
>> MRAB wrote:
>>> I suppose it depends on the complexity of the data structure. A dict's
>>> methods are threadsafe, for example, but if you have a data structure
>>> where access leads to multiple method calls then collectively they need
>>> a lock.
>> It also depends on the nature of the objects being used
>> as dict keys. Dict operations invoke the hashing and
>> comparison methods of the keys, which in general can
>> execute arbitrary Python code.
>>
>> If the keys are elementary built-in types such as
>> strings or ints, then dict operations will *probably*
>> be atomic. But I think I'd use a lock anyway, to be
>> on the safe side.
>>
>> --
>> Greg
> 
> Unless I missed where you guys were going, I think we got off the main
> point. The main question at hand was this: what's the best way (heck,
> any way) to implement a sort of "peek" whereby a number of processes
> can write results to some common "object" and some other process can
> "peek" into this object, looking for specific items they're interested
> in?
> 
> I've tried doing this with a queue, as follows: children all write
> results to queue, each result has an identifier.  Another interested
> party, which wants to know if identifier XXX has been placed in the
> queue, removes all the items, one by one from the queue, "keeps" the
> one matching the identifier (if found) and puts the rest of the items
> back on the queue, so other interested parties can also look through
> it.
> 
> This is not a good solution, but it illustrates what I'm trying to
> achieve..
> 
> I'm looking at multiprocessing.Manager, ctypes, etc, but nothing's
> really jumped out.
> 
> I also tried creating my own list class which uses locks to provide a
> "peek and remove" method, but I don't have a good way to share an
> instance of this object across processes.
> 
> Any thoughts would be welcomed!
> Michael

Sounds to me like you are using one queue when you should be using
several. If a single process wants to distribute information to multiple
clients, have a queue for each client. This makes it easy for each
client to find out if it has work (if it does its queue is non-empty),

Is this helpful, or a red herring?

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From mwilson at the-wire.com  Wed Mar  3 10:43:25 2010
From: mwilson at the-wire.com (Mel)
Date: Wed, 03 Mar 2010 10:43:25 -0500
Subject: Re Interest check in some delicious syntactic sugar for
	"except:pass"
References: <35e00b331003030347x30f3f2faua96a9b72814743da@mail.gmail.com>
	<mailman.191.1267627775.23598.python-list@python.org>
Message-ID: <hmm05e$16i$1@speranza.aioe.org>

Tim Chase wrote:
> I admit there are times I've done something similar, usually with
> what I call my "int0" and "float0" utility functions which
> roughly translate to "give me a stinkin' int/float and if
> something goes wrong, give me 0, but the return result better
> darn well be an int/float!" functions.  But as you describe and
> was later commended as a right-ish way to approach it,
> abstracting that off into a function with minimal code in the
> try: block is the right way to go.
[ ... ] 
 
> def int0(v):
>    """converts v to a int, or returns 0 if it can't"""
>    try:
>      return int(v)
>    except: # usually a ValueError but catch all cases
>      try:
>        # int("1.1") fails so try float()ing it first
>        return int(round(float(v)))
>      except:
>        return 0
> 
> def float0(v):
>    """converts v to a float, or returns 0 if it can't"""
>    try:
>      return float(v)
>    except:
>      return 0.0

I think replacing `except:` with `except StandardError:` would work as well, 
and be correct, too.

	Mel.




From mrkafk at gmail.com  Wed Mar  3 10:46:37 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 16:46:37 +0100
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <7x635fdcth.fsf@ruckus.brouhaha.com>
References: <mailman.34.1267409372.23598.python-list@python.org>	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<mailman.64.1267463648.23598.python-list@python.org>	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>	<7xljebyl56.fsf@ruckus.brouhaha.com>	<mailman.70.1267468806.23598.python-list@python.org>	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>	<7xhbozrfy4.fsf@ruckus.brouhaha.com>	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
Message-ID: <hmm08u$ock$1@dough.gmane.org>

Paul Rubin wrote:
> Patrick Maupin <pmaupin at gmail.com> writes:
>> One of my complaints.  If you had read the document you would have
>> seen others.  I actually have several complaints about YAML, but I
>> tried to write a cogent summary.

> Yaml sucks, but seems to have gotten some traction regardless.
> Therefore the Python principle of "there should be one and only one
> obvious way to do it" says: don't try to replace the existing thing if
> your new thing is only slightly better.  

With all due respect, Paul, and with thanks for all the help you've 
given me, I have to disagree here: this is a really, really complicated 
matter and I think there is a case even for making things slightly better.

I think this is a matter of "investment period", so to speak: is it 
short or long? In short term, it absolutely makes no sense to produce 
even slight improvement.

But in the long run it will almost certainly pay off to switch to smth 
even somewhat better implementation (say, imaginary "20%" if you get my 
drift): suppose we stay with sucky format for 10 years. Wouldn't it make 
sense to implement a new one and be "in red" in terms of effort expended 
versus saved for 3 years, but then be "in black" for the following 7 years?

> Just deal with the existing
> thing's imperfections or make improvements to it.  

OK, but how? How would you make up e.g. for JSON's lack of comments? 
Producing accompanying ".json-comment" format and writing libraries that 
parse the comments and interleave them with JSON file for producing 
human-readable commented output?

I think the effort required by all parties, both developers and users, 
before they produced smth like this and learned to use this widely and 
comprehensively, for this manner of improvement would be so high that it 
would be actually cheaper to dump the thing and develop smth new that 
has built-in support for comments.

If you mean some other method of improving existing things like formats, 
well let's hear it; but I for one don't see any worth doing to 
significant extent really, other than dumping the thing or producing 
next, improved version at least.

Improvement: other than making basic tools like parsing libraries 
editors, what improvements can you realistically make? And such 
improvements in and of themselves are not very expensive: my GPL 
Notepad++ has syntax highlighting for YAML (on top of gazillion other 
languages), and there are parsing libraries for it. So where's this 
terrible cost to it?

OTOH, if YAML produces net benefit for as few as, say, 200 people in 
real world, the effort to make it has been well worth it.

> If you can make a
> really powerful case that your new thing is 1000x better than the old
> thing, that's different, but I don't think we're seeing that here.

Perhaps in ideal world we would be able to develop smth good or at least 
decent without long series of abominations preceding it.

But I don't think we live in such world and I don't think it's possible 
to produce a decent format (or language) without decades of having to 
deal with abominations first. We learn as we go along, there's no way 
but to produce whatever works best at the moment, learning from it, 
dumping it and then doing smth better. I don't think e.g. Python could 
be produced without C, COBOL and Fortran preceding it: it's important 
not only to know how to do it, but also how (and why) not to do it, and 
learning that can't be done without producing some sort of abomination.

I'd argue that abominations are inevitable price of progress and evolution.

> Also, XML is used for pretty much everything in the Java world.  It
> sucks too, but it is highly standardized, it observably gets the job
> done, there are tons of structure editors for it, etc.  Frankly
> I'd rather have stayed with it than deal with Yaml.

http://myarch.com/why-xml-is-bad-for-humans

http://www.ibm.com/developerworks/xml/library/x-sbxml.html

Such reasons alone are enough to consider dumping XML for smth better.

Today I had to hand-edit XML config files for two programs (no other 
option). The files were rather large, complicated and doing it frankly 
sucked.

I also have to maintain a few applications that internally use XML as 
data format: while they are tolerable, they still leave smth to be 
desired, as those applications are really slow for larger datasets, 
their users systematically make errors (like forgetting to attach DTD 
before editing), and working across various versions of Windows is still 
not perfect.

If somebody out there invents smth that is better than XML "only" by 
half, I'm all for it.

> There are too many of these damn formats.  We should ban all but one of
> them (I don't much care which one).  And making even more of them is not
> the answer.

I think this is a situation of "beware of what you wish for". Suppose 
those alternative formats disappeared and you'd have no tools, however 
imperfect, to use them: I think that in many, many contexts deficiencies 
of "the" format would be so painful that most developers would just 
write their own "private" ones, and everyone would be even worse off 
than they are now.

I wouldn't worry too much about "stretching scarce resources thin" 
either: abominations completely unfit to live waste little in the way of 
resources, and we learn a deal off them too.

There are demonstrable benefits to this too: I for one am happy that 
ReST is available for me and I don't have to learn a behemoth such as 
DocBook to write documentation.

(imaginary dialog:

Paul: "eat your greens and learn your DocBook!"

Me: "but I don't like it and there's too much of it..."

;-)

OK me off the soapbox.

Regards,
mk



From bruno.42.desthuilliers at websiteburo.invalid  Wed Mar  3 10:48:43 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 03 Mar 2010 16:48:43 +0100
Subject: Method / Functions - What are the differences?
In-Reply-To: <mailman.193.1267628313.23598.python-list@python.org>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>	<4b8c2a34$0$10470$426a74cc@news.free.fr>	<mailman.81.1267492052.23598.python-list@python.org>	<4b8cd310$0$4604$426a34cc@news.free.fr>	<mailman.109.1267539415.23598.python-list@python.org>	<hmk1mn$70u$1@newsreader3.netcologne.de>	<4b8e4041$0$17447$426a34cc@news.free.fr>
	<mailman.193.1267628313.23598.python-list@python.org>
Message-ID: <4b8e84d2$0$10157$426a74cc@news.free.fr>

John Posner a ?crit :
> On 3/3/2010 5:56 AM, Bruno Desthuilliers wrote:
>> Eike Welk a ?crit :
>>> John Posner wrote:
>>>> I've updated the text at this location:
>>>>
>>>> > http://cl1p.net/bruno_0301.rst/
>>>
>>> I think this is a very useful writeup!
>>> It would be perfect with a little bit of introduction that says:
>>> 1. - What it is: "The rough details of method look-up";
>>> 2. - which contains some of the questions that that made that authors
>>> write the text. This way people with similar questions can find it
>>> with Google.
>>>
>>
>> John, do you think you could something with the following ?
> 
> Sure thing, Bruno. I'll incorporate/edit your new text below into a 
> Python Wiki entry. The headings in the Documentation table of contents 
> page (http://wiki.python.org/moin/Documentation) seem pretty sober, so I 
> plan to use a straightforward title:
> 
>   FromFunctionsToMethods

What about "TheMagicBehindMethods" ? Mmm, not sure, so do what you think 
is best.

> ... instead of the clearly superior ...
> 
>   ItsAFunctionItsAMethodItsAUseOfTheDescriptorProtocol
> 
> Does this article belong in the "Advanced Topics" section of the page? 
> I'm not sure, but I'll place it there for now. (Alternative suggestions 
> welcome!)

I spotted this:

http://www.python.org/doc/faq/programming/#what-is-a-method
http://www.python.org/doc/faq/general/#why-must-self-be-used-explicitly-in-method-definitions-and-calls

Our text is probably a bit too long for a direct inclusion in the FAQ, 
so I'd say it should go in the AdvancedTopics, and be linked from the FAQ.

> 
> Yow, the mantle of responsibility weighs heavily upon my poor shoulders!

!-)


Thanks for doing the grunt work.


From alfps at start.no  Wed Mar  3 10:56:25 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 03 Mar 2010 16:56:25 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
Message-ID: <hmm0rd$a48$1@news.eternal-september.org>

* Mike Kent:
> What's the compelling use case for this vs. a simple try/finally?

if you thought about it you would mean a simple "try/else". "finally" is always 
executed. which is incorrect for cleanup

by the way, that's one advantage:

a "with Cleanup" is difficult to get wrong, while a "try" is easy to get wrong, 
as you did here


   ---

another general advantage is as for the 'with' statement generally



>    original_dir = os.getcwd()
>    try:
>        os.chdir(somewhere)
>        # Do other stuff

also, the "do other stuff" can be a lot of code

and also, with more than one action the try-else introduces a lot of nesting


>    finally:
>        os.chdir(original_dir)
>        # Do other cleanup


cheers & hth.,

- alf


From mrkafk at gmail.com  Wed Mar  3 11:10:08 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 17:10:08 +0100
Subject: Queue peek?
In-Reply-To: <8bbd0a04-9a13-4f36-91c7-80f07bee0952@y17g2000yqd.googlegroups.com>
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>
	<58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>
	<mailman.138.1267559095.23598.python-list@python.org>	<hmjqkr$r46$1@news.eternal-september.org>
	<eae285401003021233i7a62771h590a557341f10ca4@mail.gmail.com>
	<hmk1er$mlb$1@dough.gmane.org>	<1267567723.4101.28.camel@localhost.localdomain>
	<mailman.156.1267578012.23598.python-list@python.org>	<7v6cf4FnnrU1@mid.individual.net>
	<8bbd0a04-9a13-4f36-91c7-80f07bee0952@y17g2000yqd.googlegroups.com>
Message-ID: <hmm1l0$u6i$1@dough.gmane.org>

Veloz wrote:

> Unless I missed where you guys were going, I think we got off the main
> point. The main question at hand was this: what's the best way (heck,
> any way) to implement a sort of "peek" whereby a number of processes
> can write results to some common "object" and some other process can
> "peek" into this object, looking for specific items they're interested
> in?

I have used threads so far and not multiprocessing (much), so I'll 
describe it using threads:

If I were you, I'd do it the simplest possible way, with dictionary and 
lock, in the following way:

1. Have shared "queue" of tasks, say, a dictionary.

2. Each worker thread and central "queue manager" access the queue in 
the same manner:

...do your stuff, prepare yourself

acquire a lock

update or read value from queue

...don't do much here to be able release lock quickly

release the lock

...process value

If you had your dictionary simple, it could work like Daniel Stutzbach 
wrote, that updates are thread safe and perhaps you could even dispense 
with locks and just read the dictionary; and if you wanted to use locks, 
for "peek"ing you could write a function that could e.g. acquire a lock, 
do a copy of the queue, release the lock, and return the copy to the 
object wanting to examine the queue.

I have used this approach (although with a list, not a dictionary -- I 
haven't had the need to do extensive searching by keys) and so far it 
has worked for me.

Regards,
mk



From steve at REMOVE-THIS-cybersource.com.au  Wed Mar  3 11:10:50 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 03 Mar 2010 16:10:50 GMT
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <kyoevn.k63@spenarnc.xs4all.nl>
	<hmk60h$nce$1@reader1.panix.com> <7v69rcFcmeU1@mid.individual.net>
	<hmltsi$jcd$1@reader1.panix.com> <hmlvas$2a6$1@reader1.panix.com>
Message-ID: <4b8e8a0a$0$27863$c3e8da3@news.astraweb.com>

On Wed, 03 Mar 2010 15:30:36 +0000, Grant Edwards wrote:

> I definitely remember that old MS-DOS programs would treat Ctrl-Z as an
> EOF marker when it was read from a text file and would terminate a text
> file with a Ctrl-Z when writing one.

I believe that Windows (at least up to Windows XP) still supports using 
ctrl-Z as EOF when reading text files.


-- 
Steven


From darcy at druid.net  Wed Mar  3 11:12:48 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Wed, 3 Mar 2010 11:12:48 -0500
Subject: Docstrings considered too complicated
In-Reply-To: <4B8E7538.2080003@mrabarnett.plus.com>
References: <20100224212303.242222c6@geekmail.INVALID>
	<eq4l57-okf2.ln1@ozzie.tundraware.com>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <7uu1ooFiipU1@mid.individual.net>
	<4B89D8BE.2040905@mrabarnett.plus.com> <4B8B9845.70604@sequans.com>
	<mailman.59.1267456634.23598.python-list@python.org>
	<7v695nFa0fU1@mid.individual.net>
	<4B8E7538.2080003@mrabarnett.plus.com>
Message-ID: <20100303111248.7f40d659.darcy@druid.net>

On Wed, 03 Mar 2010 14:42:00 +0000
MRAB <python at mrabarnett.plus.com> wrote:
> Gregory Ewing wrote:
> Mk14 from Science of Cambridge, a kit with hex keypad and 7-segment
> display, which I had to solder together, and also make my own power
> supply. I had the extra RAM and the I/O chip, so that's 256B (including
> the memory used by the monitor) + 256B additional RAM + 128B more in the
> I/O chip.

In case some of you youngsters think that there is a typo in the above,
no, he means a total of 640 bytes.  In today's terms that would be
approx 0.0000006GB.

Makes me want to go down to the basement and fire up the Altair.  :-)

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


From alfps at start.no  Wed Mar  3 11:14:29 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 03 Mar 2010 17:14:29 +0100
Subject: Docstrings considered too complicated
In-Reply-To: <4b8e8a0a$0$27863$c3e8da3@news.astraweb.com>
References: <20100224212303.242222c6@geekmail.INVALID>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>
	<kyoevn.k63@spenarnc.xs4all.nl>	<hmk60h$nce$1@reader1.panix.com>
	<7v69rcFcmeU1@mid.individual.net>	<hmltsi$jcd$1@reader1.panix.com>
	<hmlvas$2a6$1@reader1.panix.com>
	<4b8e8a0a$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <hmm1t8$gft$1@news.eternal-september.org>

* Steven D'Aprano:
> On Wed, 03 Mar 2010 15:30:36 +0000, Grant Edwards wrote:
> 
>> I definitely remember that old MS-DOS programs would treat Ctrl-Z as an
>> EOF marker when it was read from a text file and would terminate a text
>> file with a Ctrl-Z when writing one.
> 
> I believe that Windows (at least up to Windows XP) still supports using 
> ctrl-Z as EOF when reading text files.

It does, at least when the Ctrl Z is the sole contents of a "line".

And it's a pain. :-(

As a practical matter, when entering text in a console window the F6 key 
generates Ctrl Z.


Cheers,

- Alf


From steve at REMOVE-THIS-cybersource.com.au  Wed Mar  3 11:16:55 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 03 Mar 2010 16:16:55 GMT
Subject: Re Interest check in some delicious syntactic sugar for
	"except:pass"
References: <mailman.178.1267616851.23598.python-list@python.org>
Message-ID: <4b8e8b77$0$27863$c3e8da3@news.astraweb.com>

On Wed, 03 Mar 2010 06:47:28 -0500, Oren Elrad wrote:

> With that said, let me at least offer a token defense of my position. By
> way of motivation, I wrote that email after copying/pasting the
> following a few times around a project until I wrote it into def
> SilentlyDelete() and its cousin SilentlyRmdir()
> 
> """ code involving somefile """
> try:
> ........os.remove(somefile)
> except:
> .......pass     # The bloody search indexer has got the file and I can't
> delete it. Nothing to be done.

Or:

(1) you forgot to import the os module
(2) the os module (or os.remove) was rebound or monkey-patched to 
something unexpected
(3) you have a bug in your code and somefile=23 (say) instead of the 
filename you're expecting
(4) the user hit the interrupt key just at that instance
(5) somefile doesn't exist
(6) somefile does exist, but you don't have write-permission for it
(7) the disk is mounted read-only
(8) you don't have a search indexer and something else has gone wrong

Hiding all those different errors is, quite frankly, shoddy work.

#1-3 certainly shouldn't be hidden, as they are bugs in your program. #4 
shouldn't be hidden, ignoring the user's interrupt command is bad, and 
rude if it is deliberate. #5 probably shouldn't be hidden either, as it 
most likely indicates a program bug, but some rare applications may be 
okay with ignoring it. And #6-8 should be told to the user, so they can 
fix the problem.



-- 
Steven


From floris.bruynooghe at gmail.com  Wed Mar  3 11:17:32 2010
From: floris.bruynooghe at gmail.com (Floris Bruynooghe)
Date: Wed, 3 Mar 2010 08:17:32 -0800 (PST)
Subject: Queue peek?
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>
	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>
Message-ID: <137d7aa5-a305-4091-a244-904b680d3b56@t41g2000yqt.googlegroups.com>

On Mar 2, 6:18?pm, Raymond Hettinger <pyt... at rcn.com> wrote:
> On Mar 2, 8:29?am, Veloz <michaelve... at gmail.com> wrote:
>
> > Hi all
> > I'm looking for a queue that I can use with multiprocessing, which has
> > a peek method.
>
> > I've seen some discussion about queue.peek but don't see anything in
> > the docs about it.
>
> > Does python have a queue class with peek semantics?
>
> Am curious about your use case? ?Why peek at something
> that could be gone by the time you want to use it.
>
> ? val = q.peek()
> ? if something_i_want(val):
> ? ? ? ?v2 = q.get() ? ? ? ? # this could be different than val
>
> Wouldn't it be better to just get() the value and return if you don't
> need it?
>
> ? val = q.peek()
> ? if not something_i_want(val):
> ? ? ? q.put(val)

What I have found myself wanting when thinking of this pattern is a
"q.put_at_front_of_queue(val)" method.  I've never actually used this
because of not having such a method.  Not that it's that much of an
issue as I've never been completely stuck and usually found a way to
solve whatever I was trying to do without peeking, which could be
argued as a better design in the first place.  I was just wondering if
other people ever missed the "q.put_at_front_of_queue()" method or if
it is just me.

Regards
Floris

PS: assuming "val = q.get()" on the first line


From johnfilben at yahoo.com  Wed Mar  3 11:19:08 2010
From: johnfilben at yahoo.com (John Filben)
Date: Wed, 3 Mar 2010 08:19:08 -0800 (PST)
Subject: Sort Big File Help
Message-ID: <374400.23537.qm@web33805.mail.mud.yahoo.com>

I am new to Python but have used many other (mostly dead) languages in the past.? I want to be able to process *.txt and *.csv files.? I can now read that and then change them as needed ? mostly just take a column and do some if-then to create a new variable.? My problem is sorting these files:
1.)??? How do I sort file1.txt by position and write out file1_sorted.txt; for example, if all the records are 100 bytes long and there is a three digit id in the position 0-2; here would be some sample data:
a.?????? 001JohnFilben??
b.????? 002Joe? Smith?..
2.)??? How do I sort file1.csv by column name; for example, if all the records have three column headings, ?id?, ?first_name?, ?last_name?; ?here would be some sample data:
a.?????? Id, first_name,last_name
b.????? 001,John,Filben
c.?????? 002,Joe, Smith
3.)??? What about if I have millions of records and I am processing on a laptop with a large external drive ? basically, are there space considerations? What are the work arounds.
Any help would be appreciated. Thank you.

?John Filben
Cell Phone - 773.401.2822
Email - johnfilben at yahoo.com 


      
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From drobinow at gmail.com  Wed Mar  3 11:22:06 2010
From: drobinow at gmail.com (David Robinow)
Date: Wed, 3 Mar 2010 11:22:06 -0500
Subject: Docstrings considered too complicated
In-Reply-To: <hmlvas$2a6$1@reader1.panix.com>
References: <20100224212303.242222c6@geekmail.INVALID>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <kyoevn.k63@spenarnc.xs4all.nl>
	<hmk60h$nce$1@reader1.panix.com> <7v69rcFcmeU1@mid.individual.net>
	<hmltsi$jcd$1@reader1.panix.com> <hmlvas$2a6$1@reader1.panix.com>
Message-ID: <4eb0089f1003030822t2a7ec46au57a03de266a4d630@mail.gmail.com>

On Wed, Mar 3, 2010 at 10:30 AM, Grant Edwards <invalid at invalid.invalid> wrote:
> On 2010-03-03, Grant Edwards <invalid at invalid.invalid> wrote:
> I definitely remember that old MS-DOS programs would treat
> Ctrl-Z as an EOF marker when it was read from a text file and
> would terminate a text file with a Ctrl-Z when writing one.

Actually cmd.exe (at least on Windows XP) still treats Ctrl-Z as an EOF marker.


From mrkafk at gmail.com  Wed Mar  3 11:26:19 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 17:26:19 +0100
Subject: taking python enterprise level?...
In-Reply-To: <20100302015813.5397655e.darcy@druid.net>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>
	<20100302015813.5397655e.darcy@druid.net>
Message-ID: <hmm2jc$28u$1@dough.gmane.org>

D'Arcy J.M. Cain wrote:
> I keep seeing this statement but nothing to back it up.  I have created
> many apps that run on Python with a PostgreSQL database with a fully
> normalized schema and I can assure you that database joins were never
> my problem unless I made a badly constructed query or left off a
> critical index.

I too have done that (Python/PGSQL), even adding a complicated layer of 
SQLAlchemy on top of it and have not had issue with this: when I 
profiled one of my apps, it turned out that it spent most of its 
computation time... rendering HTML. Completely unexpected: I expected DB 
to be bottleneck (although it might be that with huge datasets this 
might change).

Having said that, re evidence that joins are bad: from what I've *heard* 
about Hibernate in Java from people who used it (I haven't used 
Hibernate apart from "hello world"), in case of complicated object 
hierarchies it supposedly generates a lot of JOINs and that supposedly 
kills DB performance.

So there *may* be some evidence that joins are indeed bad in practice. 
If someone has smth specific/interesting on the subject, please post.

Regards,
mk





From phil at freehackers.org  Wed Mar  3 11:32:12 2010
From: phil at freehackers.org (BlueBird)
Date: Wed, 3 Mar 2010 08:32:12 -0800 (PST)
Subject: SOAP 1.2 Python client ?
Message-ID: <5a36bd30-6cbd-48ca-9ca3-dc34c97e03c0@o30g2000yqb.googlegroups.com>


Hi,

I am looking for a SOAP 1.2 python client. To my surprise, it seems
that this does not exist. Does anybody know about this ?

The following clients seem to be both unmaintained and still
supporting only SOAP 1.1 :

- SUDS
- zsi
- SOAPy


cheers,

Philippe


From jjposner at optimum.net  Wed Mar  3 11:32:55 2010
From: jjposner at optimum.net (John Posner)
Date: Wed, 03 Mar 2010 11:32:55 -0500
Subject: Method / Functions - What are the differences?
In-Reply-To: <hmlte9$d0f$1@dough.gmane.org>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>	<4b8c2a34$0$10470$426a74cc@news.free.fr>	<mailman.81.1267492052.23598.python-list@python.org>	<4b8cd310$0$4604$426a34cc@news.free.fr>	<mailman.109.1267539415.23598.python-list@python.org>	<hmk1mn$70u$1@newsreader3.netcologne.de>	<4b8e4041$0$17447$426a34cc@news.free.fr>
	<hmlte9$d0f$1@dough.gmane.org>
Message-ID: <hmm2ur$3bv$1@dough.gmane.org>

On 3/3/2010 9:58 AM, John Posner wrote:

> Film at 11,
> John
>

Done -- see http://wiki.python.org/moin/FromFunctionToMethod

-John



From showell30 at yahoo.com  Wed Mar  3 11:37:54 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Wed, 3 Mar 2010 08:37:54 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org> 
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com> 
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
	<mailman.199.1267631220.23598.python-list@python.org>
Message-ID: <7071cfa0-0485-4192-b3ee-8e12d9f1fca2@f17g2000prh.googlegroups.com>

On Mar 3, 7:46?am, mk <mrk... at gmail.com> wrote:
> Paul Rubin wrote:
> > Patrick Maupin <pmau... at gmail.com> writes:
> >> One of my complaints. ?If you had read the document you would have
> >> seen others. ?I actually have several complaints about YAML, but I
> >> tried to write a cogent summary.
> > Yaml sucks, but seems to have gotten some traction regardless.
> > Therefore the Python principle of "there should be one and only one
> > obvious way to do it" says: don't try to replace the existing thing if
> > your new thing is only slightly better. ?
>
> With all due respect, Paul, and with thanks for all the help you've
> given me, I have to disagree here: this is a really, really complicated
> matter and I think there is a case even for making things slightly better.
>
> I think this is a matter of "investment period", so to speak: is it
> short or long? In short term, it absolutely makes no sense to produce
> even slight improvement.
>
> But in the long run it will almost certainly pay off to switch to smth
> even somewhat better implementation (say, imaginary "20%" if you get my
> drift): suppose we stay with sucky format for 10 years. Wouldn't it make
> sense to implement a new one and be "in red" in terms of effort expended
> versus saved for 3 years, but then be "in black" for the following 7 years?
>

I think ten years is about the right horizon to be looking down.
Anything further than ten years is probably so speculative as to have
lots of diminishing returns, although I admire people who have really
BIG ideas and are starting on them now.  (The particular context of
this thread doesn't lead to big ideas, unless I just lack
imagination.)

I think it's wrong, though, only to look five years ahead.  If the
only goal was to make software development easier in 2015, then I'd
say, by all means, let's pick the current best-of-breed tools and
simply perfect them as much as we can.  This is a worthwhile goal
regardless of your ultimate time horizon, and that effort tends to
happen anyway, since so many people rightly live in the here and
now.

Somewhere in the 2020s, though, I predict that a lot of technologies
are either going to finally die off, or at least be restricted to the
niches that they serve well.  Take Java, for example.  I think it will
be still be used, and people will still even be writing new programs
in it, but it will be rightly scorned in a lot of places where it is
now embraced.  Some of this won't actually be due to technological
advances, but just changes in perception.  For example, I predict lots
of programs that people now write in Java will be written in Python,
even if the core language of Python remains fairly stable.

Beyond just changing mindsets, though, I think evolution is
inevitable.  Some subset of Python tools will almost certainly develop
features that are more friendly to the Java mindset, but work in
Python, and this will help move folks from Java to Python.  I also
think that Java will be supplanted for lots of use cases by some
languages invented after 2000.  Maybe Scala will become more
mainstream.  Maybe Go will turn into more of an enterprise-y
platform.  Who knows?

With regard to XML, I think at a bare minimum, folks will stop using
XML for use cases that YAML, JSON, and maybe even RSON serve better
today.  I bet that at least one of YAML and JSON survives in some
form, and my money is on JSON, but I bet there will also be some new
competing formats.  I also think that we'll still have multiple
formats that are only marginally better than each other for general
use cases, but which people will still choose for specific reasons.
Developers *love* good tools almost as much as they hate confusion--
there will always be tension between having too many choices and not
enough.

Going back to Paul's statement, I agree that "there should be one and
only one obvious way to do it" in Python, but I don't think the
philosophy applies to the greater ecosystem of software development.
In our generation I think we have the live with the confusion and
chaos that comes from a plethora of tools, and that's just part of
progress.  Ironically, I think the tools that survive will be very
focused in their own right; it's just that we'll still have many to
choose from.

Going back to XML, I found myself using it last night for a completely
inappropriate use case.  It so happens that it would have been about
100% better if it had simply been written in JSON, so there was no
compelling need for yet another alternative.  But if the inventers of
JSON had been complacent about XML, we wouldn't even have that as an
option.  And, of course, there is nothing radical at all about JSON--I
am pretty sure it was just a common sense realization about the
inadequacies of current technologies that led to its development, and
I'm sure early versions of it were pretty raw.  Without having looked
into RSON, I am sure it's the same mindset that drives its invention--
current tools exist that can get the some done, but we can do better.
Whether RSON is really an improvement or not is an orthogonal issue to
whether we should strive for improvement.




From michaelveloz at gmail.com  Wed Mar  3 11:39:18 2010
From: michaelveloz at gmail.com (Veloz)
Date: Wed, 3 Mar 2010 08:39:18 -0800 (PST)
Subject: When to lock data items returned by multiprocessing.Manager?
Message-ID: <4428d674-7fa7-4095-a93d-75ea31a81d9a@15g2000yqi.googlegroups.com>

So I'm using a multiprocessing.Manager instance in my main app and
asking it to create a dictionary, which I am providing to instances of
the application that I'm forking off with Process.

The Processes and main app will be reading/writing to the dictionary.

It's not clear to me what I have to "lock" and what I don't have to
lock. Any ideas?

I'm thinking that what Manager brings to the table is the ability to
share the dictionary but it may not provide anything to control
concurrent access to it, and thus I should lock all operations I
perform on it.. But I don't know this for a fact. Any input is
welcomed on this!!

Michael


From thudfoo at opensuse.us  Wed Mar  3 11:43:24 2010
From: thudfoo at opensuse.us (member thudfoo)
Date: Wed, 3 Mar 2010 08:43:24 -0800
Subject: Writing an assembler in Python
In-Reply-To: <7v6el6F1ddU1@mid.individual.net>
References: <Xns9D28186AF890Cfdnbgui7uhu5h8hrnuio@127.0.0.1>
	<kyo49n.gr4@spenarnc.xs4all.nl> <7v6el6F1ddU1@mid.individual.net>
Message-ID: <3d881a311003030843x14217f0aua4005dbe58caf630@mail.gmail.com>

On Tue, Mar 2, 2010 at 10:52 PM, Gregory Ewing
<greg.ewing at canterbury.ac.nz> wrote:
>> In article <Xns9D28186AF890Cfdnbgui7uhu5h8hrnuio at 127.0.0.1>,
>> Giorgos Tzampanakis ?<gt67 at hw.ac.uk> wrote:
>>
>>> I'm implementing a CPU that will run on an FPGA. I want to have a
>>> (dead) simple assembler that will generate the machine code for
>>> me. I want to use Python for that. Are there any libraries that
>>> can help me with the parsing of the assembly code?
>
> I wrote a PIC assembler in Python once. I didn't bother
> with any parsing libraries. I used a regular expression
> to split the input into tokens, then wrote ad-hoc
> parsing code in Python.
>
> --
> Greg
> --
> http://mail.python.org/mailman/listinfo/python-list
>

I used Plex.

The lexer is here: http://pastebin.com/9Rm4rDfu

The target for the assembler is a toy single-byte processor.


From darcy at druid.net  Wed Mar  3 11:46:03 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Wed, 3 Mar 2010 11:46:03 -0500
Subject: Docstrings considered too complicated
In-Reply-To: <hmltsi$jcd$1@reader1.panix.com>
References: <20100224212303.242222c6@geekmail.INVALID>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <kyoevn.k63@spenarnc.xs4all.nl>
	<hmk60h$nce$1@reader1.panix.com> <7v69rcFcmeU1@mid.individual.net>
	<hmltsi$jcd$1@reader1.panix.com>
Message-ID: <20100303114603.7021e9ba.darcy@druid.net>

On Wed, 3 Mar 2010 15:05:54 +0000 (UTC)
Grant Edwards <invalid at invalid.invalid> wrote:
> > It was actually an improvement over CP/M's file
> > system. CP/M didn't have hierarchical directories
> 
> Neither did the original MS-DOS filesystem.

I think that it always had a hierarchical file system although I am not
sure about 86-DOS or QDOS on which is was based.

> > or timestamps and recorded file sizes in 128-byte blocks
> > rather than bytes.
> 
> I thought that was true of the original MS-DOS filesystem as
> well, but I wouldn't bet money on it.

And that is why text files in MS-DOS and CP/M before it end with ^Z.
They needed a way to tell where the end of the information was.  Why
they used ^Z (SUB - Substitute) instead of ^C (ETX - End of TeXt) or
even ^D (EOT - End Of Transmission) is anyone's guess.

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


From robert.kern at gmail.com  Wed Mar  3 12:00:04 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 03 Mar 2010 11:00:04 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
Message-ID: <hmm4ik$a1h$1@dough.gmane.org>

On 2010-03-03 09:39 AM, Mike Kent wrote:
> What's the compelling use case for this vs. a simple try/finally?
>
>     original_dir = os.getcwd()
>     try:
>         os.chdir(somewhere)
>         # Do other stuff
>     finally:
>         os.chdir(original_dir)
>         # Do other cleanup

A custom-written context manager looks nicer and can be more readable.

from contextlib import contextmanager
import os

@contextmanager
def pushd(path):
     original_dir = os.getcwd()
     os.chdir(path)
     try:
         yield
     finally:
         os.chdir(original_dir)


with pushd(somewhere):
     ...


I don't think a general purpose ScopeGuard context manager has any such benefits 
over the try: finally:, though.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From jjposner at optimum.net  Wed Mar  3 12:02:10 2010
From: jjposner at optimum.net (John Posner)
Date: Wed, 03 Mar 2010 12:02:10 -0500
Subject: Method / Functions - What are the differences?
In-Reply-To: <4b8e84d2$0$10157$426a74cc@news.free.fr>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>	<4b8c2a34$0$10470$426a74cc@news.free.fr>	<mailman.81.1267492052.23598.python-list@python.org>	<4b8cd310$0$4604$426a34cc@news.free.fr>	<mailman.109.1267539415.23598.python-list@python.org>	<hmk1mn$70u$1@newsreader3.netcologne.de>	<4b8e4041$0$17447$426a34cc@news.free.fr>	<mailman.193.1267628313.23598.python-list@python.org>
	<4b8e84d2$0$10157$426a74cc@news.free.fr>
Message-ID: <hmm4lm$ahm$1@dough.gmane.org>

On 3/3/2010 10:48 AM, Bruno Desthuilliers wrote:

>
> I spotted this:
>
> http://www.python.org/doc/faq/programming/#what-is-a-method
> http://www.python.org/doc/faq/general/#why-must-self-be-used-explicitly-in-method-definitions-and-calls
>
>
> Our text is probably a bit too long for a direct inclusion in the FAQ,
> so I'd say it should go in the AdvancedTopics, and be linked from the FAQ.

Linking from the FAQ means changing the official Python documentation, 
which requires lots of hoop-jumping-through. I suggest that we content 
ourselves with using the Wiki -- at least for now.

>
> Thanks for doing the grunt work.

Pas de quoi.

-John





From bruno.42.desthuilliers at websiteburo.invalid  Wed Mar  3 12:03:37 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 03 Mar 2010 18:03:37 +0100
Subject: Method / Functions - What are the differences?
In-Reply-To: <mailman.205.1267633968.23598.python-list@python.org>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>	<4b8c2a34$0$10470$426a74cc@news.free.fr>	<mailman.81.1267492052.23598.python-list@python.org>	<4b8cd310$0$4604$426a34cc@news.free.fr>	<mailman.109.1267539415.23598.python-list@python.org>	<hmk1mn$70u$1@newsreader3.netcologne.de>	<4b8e4041$0$17447$426a34cc@news.free.fr>	<hmlte9$d0f$1@dough.gmane.org>
	<mailman.205.1267633968.23598.python-list@python.org>
Message-ID: <4b8e9660$0$21812$426a34cc@news.free.fr>

John Posner a ?crit :
> On 3/3/2010 9:58 AM, John Posner wrote:
> 
>> Film at 11,
>> John
>>
> 
> Done -- see http://wiki.python.org/moin/FromFunctionToMethod

Done and well done !-)
Thanks again for the good job John.

PS : Do you think it could be possible to add link to this page from the 
relevant FAQ items ?

http://www.python.org/doc/faq/programming/#what-is-a-method
http://www.python.org/doc/faq/general/#why-must-self-be-used-explicitly-in-method-definitions-and-calls 




From nagle at animats.com  Wed Mar  3 12:05:44 2010
From: nagle at animats.com (John Nagle)
Date: Wed, 03 Mar 2010 09:05:44 -0800
Subject: Working group for Python CPAN-equivalence?
In-Reply-To: <87r5o1v8vp.fsf@benfinney.id.au>
References: <mailman.179.1267620332.23598.python-list@python.org>
	<87r5o1v8vp.fsf@benfinney.id.au>
Message-ID: <4b8e929d$0$1585$742ec2ed@news.sonic.net>

Ben Finney wrote:
> Olof Bjarnason <olof.bjarnason at gmail.com> writes:
> 
>> Hi everybody!
>>
>> The "Where is CPAN for Python?" question keeps popping up, with
>> answers ranging from "There is no CPAN for Python" and "We already
>> have CPAN for Python" (confusing).
> 
> Caused in no small measure by the fact that Perl people mean at least
> two distinct things by ?Where is CPAN for Python??:
> 
> * The central package registry, CPAN, with metadata in a standard
>   queryable format, and all registered packages redundantly mirrored and
>   available for installation at user-specified versions.
> 
>   We have an equivalent in PyPI, though it's incomplete since many
>   *registered* packages are not actually hosted *at* PyPI.

    CPAN is a repository.   PyPi is an collection of links.

    CPAN has over 260 mirrors.  PyPi has none.

    CPAN enforces standard organization on packages.  PyPi does not.

    CPAN has quality control, with testers and a test reporting system.
    PyPi does not.

				John Nagle


From emannion at gmail.com  Wed Mar  3 12:05:47 2010
From: emannion at gmail.com (enda man)
Date: Wed, 3 Mar 2010 09:05:47 -0800 (PST)
Subject: using subprocess.Popen  env parameter
Message-ID: <47f5881a-a7bd-4a57-8e2d-ae27cfbf3a9a@x22g2000yqx.googlegroups.com>

Hi,

I want to use the env parameter to subprocess.Popen to pass in a path
to a location the process needs to run,
I do have a env variable already called MS_VC_PATH and I want to add
to it, not set up more in the PATH variable.

/////
ms_vc_path=os.environ['MS_VC_PATH']
cl_path = ms_vc_path + '\VC\bin'
lib_vc_path = ms_vc_path + '\VC\lib'
myenv = os.environ
myenv["PATH"] = cl_path + ";" + lib_vc_path + ";" + myenv["PATH"]

subprocess.Popen("midl /D \"_DEBUG\" /nologo /char signed /env win32 /
Oicf  /tlb \"ActivexPlugin.tlb\" /h \"ActivexPlugin_i.h\" /iid
\"ActivexPlugin_i.c\" /proxy \"ActivexPlugin_p.c\" /error stub_data
ActivexPlugin.idl", env=myenv)

///

but it seems that midl can not see the new path I am sending to it
using the env variable, am I using env correctly?

here is my output:
midl : command line error MIDL1005 : cannot find C preprocessor cl.exe

Any help?
EM


From skylarking11 at gmail.com  Wed Mar  3 12:06:27 2010
From: skylarking11 at gmail.com (Sky Larking)
Date: Wed, 3 Mar 2010 09:06:27 -0800 (PST)
Subject: Installing Scrapy on Mac OS X 10.6
Message-ID: <9b08574f-0410-45bc-89af-0d3cf7d21819@e7g2000yqf.googlegroups.com>

Has anyone successfully installed Scrapy ( http://scrapy.org ) on a
Mac OS X machine running 10.6.x? The Documentaion says
Mac OS X ships an libxml2 version too old to be used by Scrapy...But
doesn't say which version of OS X.. I am wondering if the version of
libxml2 is also not compatible..





From robert.kern at gmail.com  Wed Mar  3 12:09:11 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 03 Mar 2010 11:09:11 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <hmm0rd$a48$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<hmm0rd$a48$1@news.eternal-september.org>
Message-ID: <hmm53o$ca0$1@dough.gmane.org>

On 2010-03-03 09:56 AM, Alf P. Steinbach wrote:
> * Mike Kent:
>> What's the compelling use case for this vs. a simple try/finally?
>
> if you thought about it you would mean a simple "try/else". "finally" is
> always executed. which is incorrect for cleanup

Eh? Failed execution doesn't require cleanup? The example you gave is definitely 
equivalent to the try: finally: that Mike posted. The actions are always 
executed in your example, not just when an exception isn't raised.

 From your post, the scope guard technique is used "to ensure some desired 
cleanup at the end of a scope, even when the scope is exited via an exception." 
This is precisely what the try: finally: syntax is for. The with statement 
allows you to encapsulate repetitive boilerplate into context managers, but a 
general purpose context manager like your Cleanup class doesn't take advantage 
of this.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From alfps at start.no  Wed Mar  3 12:09:53 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 03 Mar 2010 18:09:53 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.209.1267635630.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<mailman.209.1267635630.23598.python-list@python.org>
Message-ID: <hmm554$6l5$1@news.eternal-september.org>

* Robert Kern:
> On 2010-03-03 09:39 AM, Mike Kent wrote:
>> What's the compelling use case for this vs. a simple try/finally?
>>
>>     original_dir = os.getcwd()
>>     try:
>>         os.chdir(somewhere)
>>         # Do other stuff
>>     finally:
>>         os.chdir(original_dir)
>>         # Do other cleanup
> 
> A custom-written context manager looks nicer and can be more readable.
> 
> from contextlib import contextmanager
> import os
> 
> @contextmanager
> def pushd(path):
>     original_dir = os.getcwd()
>     os.chdir(path)
>     try:
>         yield
>     finally:
>         os.chdir(original_dir)
> 
> 
> with pushd(somewhere):
>     ...
> 
> 
> I don't think a general purpose ScopeGuard context manager has any such 
> benefits over the try: finally:, though.

I don't think that's a matter of opinion, since one is correct while the other 
is incorrect.


Cheers,

- ALf


From invalid at invalid.invalid  Wed Mar  3 12:15:02 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Wed, 3 Mar 2010 17:15:02 +0000 (UTC)
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <kyoevn.k63@spenarnc.xs4all.nl>
	<hmk60h$nce$1@reader1.panix.com> <7v69rcFcmeU1@mid.individual.net>
	<hmltsi$jcd$1@reader1.panix.com>
	<mailman.208.1267634665.23598.python-list@python.org>
Message-ID: <hmm5em$hl6$1@reader1.panix.com>

On 2010-03-03, D'Arcy J.M. Cain <darcy at druid.net> wrote:
> On Wed, 3 Mar 2010 15:05:54 +0000 (UTC)
> Grant Edwards <invalid at invalid.invalid> wrote:
>> > It was actually an improvement over CP/M's file
>> > system. CP/M didn't have hierarchical directories
>> 
>> Neither did the original MS-DOS filesystem.
>
> I think that it always had a hierarchical file system

The hierarchical file system wasn't introduced until MS-DOS 2.0.
Versions prior to that were flat filesystem just like CP/M.

>From http://en.wikipedia.org/wiki/File_Allocation_Table

  At the time FAT12 was introduced, DOS did not support hierarchical
  directories, and the maximum number of files was typically limited
  to a few dozen. Hierarchical directories were introduced in MS-DOS
  version 2.0.

-- 
Grant Edwards               grant.b.edwards        Yow! I wonder if I could
                                  at               ever get started in the
                              gmail.com            credit world?


From alfps at start.no  Wed Mar  3 12:18:44 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 03 Mar 2010 18:18:44 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.211.1267636174.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>
	<mailman.211.1267636174.23598.python-list@python.org>
Message-ID: <hmm5ln$arg$1@news.eternal-september.org>

* Robert Kern:
> On 2010-03-03 09:56 AM, Alf P. Steinbach wrote:
>> * Mike Kent:
>>> What's the compelling use case for this vs. a simple try/finally?
>>
>> if you thought about it you would mean a simple "try/else". "finally" is
>> always executed. which is incorrect for cleanup
> 
> Eh? Failed execution doesn't require cleanup? The example you gave is 
> definitely equivalent to the try: finally: that Mike posted.

Sorry, that's incorrect: it's not.

With correct code (mine) cleanup for action A is only performed when action A 
succeeds.

With incorrect code cleanup for action A is performed when A fails.


> The actions 
> are always executed in your example,

Sorry, that's incorrect.


> [The actions are] not [executed] just when an exception isn't  raised.

Sorry, that's incorrect.


>  From your post, the scope guard technique is used "to ensure some 
> desired cleanup at the end of a scope, even when the scope is exited via 
> an exception." This is precisely what the try: finally: syntax is for. 

You'd have to nest it. That's ugly. And more importantly, now two people in this 
thread (namely you and Mike) have demonstrated that they do not grok the try 
functionality and manage to write incorrect code, even arguing that it's correct 
when informed that it's not, so it's a pretty fragile construct, like goto.


> The with statement allows you to encapsulate repetitive boilerplate into 
> context managers, but a general purpose context manager like your 
> Cleanup class doesn't take advantage of this.

I'm sorry but that's pretty meaningless. It's like: "A house allows you to 
encapsulate a lot of stinking garbage, but your house doesn't take advantage of 
that, it's disgustingly clean". Hello.


Cheers & hth.,

- Alf


From xahlee at gmail.com  Wed Mar  3 12:36:26 2010
From: xahlee at gmail.com (Xah Lee)
Date: Wed, 3 Mar 2010 09:36:26 -0800 (PST)
Subject: NoSQL Movement?
Message-ID: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>

recently i wrote a blog article on The NoSQL Movement
at http://xahlee.org/comp/nosql.html

i'd like to post it somewhere public to solicit opinions, but in the
20 min or so, i couldn't find a proper newsgroup, nor private list
that my somewhat anti-NoSQL Movement article is fitting.

So, i thought i'd post here to solicit some opinins from the programer
community i know.

Here's the plain text version

-----------------------------
The NoSQL Movement

Xah Lee, 2010-01-26

In the past few years, there's new fashionable thinking about anti
relational database, now blessed with a rhyming term: NoSQL.
Basically, it considers that relational database is outdated, and not
?horizontally? scalable. I'm quite dubious of these claims.

According to Wikipedia Scalability article, verticle scalability means
adding more resource to a single node, such as more cpu, memory. (You
can easily do this by running your db server on a more powerful
machine.), and ?Horizontal scalability? means adding more machines.
(and indeed, this is not simple with sql databases, but again, it is
the same situation with any software, not just database. To add more
machines to run one single software, the software must have some sort
of grid computing infrastructure built-in. This is not a problem of
the software per se, it is just the way things are. It is not a
problem of databases.)

I'm quite old fashioned when it comes to computer technology. In order
to convience me of some revolutionary new-fangled technology, i must
see improvement based on math foundation. I am a expert of SQL, and
believe that relational database is pretty much the gist of database
with respect to math. Sure, a tight definition of relations of your
data may not be necessary for many applications that simply just need
store and retrieve and modify data without much concern about the
relations of them. But still, that's what relational database
technology do too. You just don't worry about normalizing when you
design your table schema.

The NoSQL movement is really about scaling movement, about adding more
machines, about some so-called ?cloud computing? and services with
simple interfaces. (like so many fashionable movements in the
computing industry, often they are not well defined.) It is not really
about anti relation designs in your data. It's more about adding
features for practical need such as providing easy-to-user APIs (so
you users don't have to know SQL or Schemas), ability to add more
nodes, provide commercial interface services to your database, provide
parallel systems that access your data. Of course, these needs are all
done by any big old relational database companies such as Oracle over
the years as they constantly adopt the changing industry's needs and
cheaper computing power. If you need any relations in your data, you
can't escape relational database model. That is just the cold truth of
math.

Importat data, such as used in the bank transactions, has relations.
You have to have tight relational definitions and assurance of data
integrity.

Here's a second hand quote from Microsoft's Technical Fellow David
Campbell. Source

    I've been doing this database stuff for over 20 years and I
    remember hearing that the object databases were going to wipe out
    the SQL databases. And then a little less than 10 years ago the
    XML databases were going to wipe out.... We actually ... you
    know... people inside Microsoft, [have said] 'let's stop working
    on SQL Server, let's go build a native XML store because in five
    years it's all going....'

LOL. That's exactly my thought.

Though, i'd have to have some hands on experience with one of those
new database services to see what it's all about.

--------------------
Amazon S3 and Dynamo

Look at Structured storage. That seems to be what these nosql
databases are. Most are just a key-value pair structure, or just
storage of documents with no relations. I don't see how this differ
from a sql database using one single table as schema.

Amazon's Amazon S3 is another storage service, which uses Amazon's
Dynamo (storage system), indicated by Wikipedia to be one of those
NoSQL db. Looking at the S3 and Dynamo articles, it appears the db is
just a Distributed hash table system, with added http access
interface. So, basically, little or no relations. Again, i don't see
how this is different from, say, MySQL with one single table of 2
columns, added with distributed infrastructure. (distributed database
is often a integrated feature of commercial dbs, e.g. Wikipedia Oracle
database article cites Oracle Real Application Clusters )

Here's a interesting quote on S3:

    Bucket names and keys are chosen so that objects are addressable
    using HTTP URLs:

        * http://s3.amazonaws.com/bucket/key
        * http://bucket.s3.amazonaws.com/key
        * http://bucket/key (where bucket is a DNS CNAME record
pointing to bucket.s3.amazonaws.com)

    Because objects are accessible by unmodified HTTP clients, S3 can
    be used to replace significant existing (static) web hosting
    infrastructure.

So this means, for example, i can store all my images in S3, and in my
html document, the inline images are just normal img tags with normal
urls. This applies to any other type of file, pdf, audio, but html
too. So, S3 becomes the web host server as well as the file system.

Here's Amazon's instruction on how to use it as image server. Seems
quite simple: How to use Amazon S3 for hosting web pages and media
files? Source

--------------------
Google BigTable

Another is Google's BigTable. I can't make much comment. To make a
sensible comment, one must have some experience of actually
implementing a database. For example, a file system is a sort of
database. If i created a scheme that allows me to access my data as
files in NTFS that are distributed over hundreds of PC, communicated
thru http running Apache. This will let me access my files. To insert,
delete, data, one can have cgi scripts on each machine. Would this be
considered as a new fantastic NoNoSQL?

---------------------

comments can also be posted to
http://xahlee.blogspot.com/2010/01/nosql-movement.html

Thanks.

  Xah
? http://xahlee.org/

?


From dragonx562 at googlemail.com  Wed Mar  3 12:37:45 2010
From: dragonx562 at googlemail.com (luaisn haus)
Date: Wed, 3 Mar 2010 09:37:45 -0800 (PST)
Subject: =?ISO-8859-1?Q?kredit_haus_=2C_eigenheimzulage_einkommensgrenzen_=2C_fi?=
	=?ISO-8859-1?Q?nanzamt_eigenheimzulage_=2C_kredit_f=FCr_haus_kauf_=2C_kredit_auf?=
	=?ISO-8859-1?Q?_haus_=2C_immobilienkredit_ohne_=2C_finanzierung_eines_hauses_=2C?=
Message-ID: <3b3b51d7-5963-4f78-b103-54ac7ce9f2ed@c16g2000yqd.googlegroups.com>

kredit haus , eigenheimzulage einkommensgrenzen , finanzamt
eigenheimzulage , kredit f?r haus kauf , kredit auf haus ,
immobilienkredit ohne , finanzierung eines hauses ,

+
+
+++ GUENSTIGE KREDITE ONLINE +++ KREDITE IM INTERNET OHNE SCHUFA
IMMOBILIEN +++
+
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+
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kredit f?r ein haus haus kaufen darlehen
deutsche kreditbank f?r baufinanzierung zins f?r baufinanzierung
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g?nstige hypothekenkredite hypothekenkredit schweiz
zinsen hausfinanzierung baufinanzierung ohne eigenkapital
hartz iv eigenheimzulage eigenheimzulage 10e


From affdfsdfdsfsd at b.com  Wed Mar  3 12:38:19 2010
From: affdfsdfdsfsd at b.com (Tracubik)
Date: 03 Mar 2010 17:38:19 GMT
Subject: case do problem
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
	<hml77p$k1v$00$1@news.t-online.com>
Message-ID: <4b8e9e8b$0$1121$4fafbaef@reader3.news.tin.it>

Il Wed, 03 Mar 2010 09:39:54 +0100, Peter Otten ha scritto:

> Tracubik wrote:
> 
>> hi, i've to convert from Pascal this code:
> 
> program loop;
> 
> function generic_condition: boolean;
> begin
>    generic_condition := random > 0.7
> end;
> 
> procedure loop;
> var
>    iterations, count, m: integer;
> begin
>    iterations := 0;
>    count := 0;
>    m := 0;
>    repeat
>       iterations := iterations+1;
>       (*...*)
>       writeln(iterations:2, count:2, m:4);
>       (*...*)
>       if generic_condition then
> 	    inc(count);
>       (*...*)
>       case count of
> 	1: m := 1;
> 	2: m := 10;
> 	3: m := 100
>       end
>    until (count = 4) or (iterations = 20)
> end;
> 
> begin
>    loop;
>    writeln("That's all, folks")
> end.
> 
> Hey, I have a Pascal compiler just one apt-get away ;)
> 
> Here's how I'd translate the above, without trying to be too clever:
> 
> from random import random
> 
> def generic_condition():
>     return random() > 0.7
> 
> def loop():
>     count = 0
>     m = 0
>     lookup = {1: 1, 2: 10, 3: 100}
>     for iterations in range(20): # off by one
>         # ...
>         print "%2d %1d %3d" % (iterations, count, m) # ...
>         if generic_condition():
>             count += 1
>         # ...
>         m = lookup.get(count, m)
>         if count == 4:
>             break
> 
> if __name__ == "__main__":
>     loop()
>     print "That's all, folks"
> 
> Something must be wrong with me today because I find the Pascal code
> /more/ readable..

i was think the same, Pascal seem to generate a great more readable code. 
I'm a newbie, so my opinion is probably wrong, but i still think that 
don't have CASE OF and REPEAT UNTIL code block return in difficult-to-
read code.

> 
> Peter

Nico



From wanderer at dialup4less.com  Wed Mar  3 12:39:48 2010
From: wanderer at dialup4less.com (Wanderer)
Date: Wed, 3 Mar 2010 09:39:48 -0800 (PST)
Subject: Pylint Argument number differs from overridden method
Message-ID: <2484ca6e-0eb9-4e0c-a7db-d035badab711@t20g2000yqe.googlegroups.com>

Pylint W0221 gives the warning
Argument number differs from overridden method.

Why is this a problem? I'm overriding the method to add additional
functionality.

This
    def GetRays(self, angle, pt, lmbda = 0.6):
        """
        """

        angle, x, y, Rays, Power = self.ARefract(angle, pt[0], pt[1],
lmbda)
        pt1 = (x, y)

        return Rays, Power, angle, pt1


    def ARefract(self, angle, x, y, lmbda = 0.6):
        """
        """

        Nt = self.Mat.NtGet(lmbda)
        self.NtSet(Nt)
        angle, x, y, Rays, Power = self.Refract(angle, x, y)

        return angle, x, y, Rays, Power



Over rides this

    def GetRays(self, angle, pt):
        """
        """

        angle, x, y, Rays, Power = self.Refract(angle, pt[0], pt[1])
        pt1 = (x, y)

        return Rays, Power, angle, pt1


Thanks


From gandalf at shopzeus.com  Wed Mar  3 12:41:37 2010
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Wed, 03 Mar 2010 18:41:37 +0100
Subject: Instance factory - am I doing this right?
Message-ID: <4B8E9F51.1040203@shopzeus.com>

This is just an interesting code pattern that I have recently used:

class CacheStorage(object):
    """Generic cache storage class."""
    @classmethod
    def get_factory(cls,*args,**kwargs):
        """Create factory for a given set of cache storage creation 
parameters."""
        class CacheStorageFactory(cls):
            _construct_args = args
            _construct_kwargs = kwargs
            def __init__(self):
                cls.__init__(self,
                    *self._construct_args,**self._construct_kwargs)
        return CacheStorageFactory

Then, I can create subclasses like:

class GdbmCacheStorage(CacheStorage):
    """Gdbm cache storage class.
   
    @param basedir: Base directory where gdbm files should be stored.
    @param basename: Base name for logging and creating gdbm files.
    """
    def __init__(self,basedir,basename):
          ..... blablabla place initialization code here

class MemoryCacheStorage(CacheStorage):
    """In-Memory cache storage class.
   
    Please note that keys and values are always mashal-ed.
    E.g. when you cache an object, it makes a deep copy.
    """
    def __init__(self):
          ..... blablabla place initialization code here


And the finally, I can create a factory that can create cache storage 
instances for storing data in gdbm in a given directory:

cache_factory = GdbmCacheStorage.get_factory("~gandalf/db","test")
print cache_factory # <class '__main__.CacheStorageFactory'>
print cache_factory()

OR I can create a factory that can create instances for storing data in 
memory:


cache_factory = MemoryCacheStorage.get_factory()
print cache_factory # <class '__main__.CacheStorageFactory'>
print cache_factory() # <__main__.CacheStorageFactory object at 0x8250c6c>


Now, here is my question. Am I right in doing this? Or are there better 
language tools to be used in Python for the same thing? This whole thing 
about creating factories looks a bit odd for me. Is it Pythonic enough?

Thanks,

   Laszlo



From larudwer at freenet.de  Wed Mar  3 12:49:36 2010
From: larudwer at freenet.de (larudwer)
Date: Wed, 3 Mar 2010 18:49:36 +0100
Subject: Multiprocessing problem
References: <mailman.145.1267565451.23598.python-list@python.org>
Message-ID: <hmm6ks$89h$03$1@news.t-online.com>

Hello Matt

I think the problem is here:

        for n in xrange(100000):
            outqueue.put(str(n))        <-- fill the queue with 100000 
elements
            try:
                r = inqueue.get_nowait() <-- queue is still empty because 
processes need some time to start
                results.append(r)
            except Empty:
                pass <-- causing 100000 passes

....

        print "-"
        for task in tasks:
            outqueue.put(None)  <-- put even more data in the queue
...
# in the meantime the processes start to run and are trying to put data
# in to the output queue. However this queue might fill up, and lock
# all processes that try to write data in the already filled up queue

        print "joining"
        for task in tasks:
            task.join()            <-- can never succeed because processes 
are waiting for someone reading the result queue
        print "joined"

This example works:

from Queue import Empty, Full
from multiprocessing import Queue, Process
from base64 import b64encode
import time, random

class Worker(Process):
    def __init__(self, inqueue, outqueue):
        Process.__init__(self)
        self.inqueue = inqueue
        self.outqueue = outqueue

    def run(self):
        inqueue = self.inqueue
        outqueue = self.outqueue
        c = 0
        while True:
            arg = inqueue.get()
            if arg is None: break
            c += 1
            b = b64encode(arg)
            outqueue.put(b)

        # Clean-up code goes here
        outqueue.put(c)

class Supervisor(object):
    def __init__(self):
        pass

    def go(self):
        outqueue = Queue()
        inqueue = Queue()
        tasks = [Worker(outqueue, inqueue) for _ in xrange(4)]
        for task in tasks:
            task.start()

        results = []
        print "*"
        for n in xrange(100000):
            outqueue.put(str(n))

        print "-"
        for task in tasks:
            outqueue.put(None)

        print "emptying queue"
        try:
            while True:
                r = inqueue.get_nowait()
                results.append(r)
        except Empty:
            pass
        print "done"
        print len(results)

        print "joining"
        for task in tasks:
            task.join()
        print "joined"

if __name__ == "__main__":
    s = Supervisor()
    s.go()





From tim.wintle at teamrubber.com  Wed Mar  3 12:50:02 2010
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Wed, 03 Mar 2010 17:50:02 +0000
Subject: taking python enterprise level?...
In-Reply-To: <hmm2jc$28u$1@dough.gmane.org>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>
	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>
	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>
	<20100302015813.5397655e.darcy@druid.net>
	<hmm2jc$28u$1@dough.gmane.org>
Message-ID: <1267638602.988.19.camel@localhost>

On Wed, 2010-03-03 at 17:26 +0100, mk wrote:
> 
> So there *may* be some evidence that joins are indeed bad in
> practice. 
> If someone has smth specific/interesting on the subject, please post.

I have found joins to cause problems in a few cases - I'm talking about
relatively large tables though - roughly order 10^8 rows.

I'm on Mysql normally, but that shouldn't make any difference - I've
seen almost the same situation on Oracle

consider this simple example:

/*   Table A    */
CREATE TABLE TableA (
    project_id BIGINT NOT NULL,
    cost INT,
    date DATETIME,
    PRIMARY KEY (project_id, date)
);

/* Table projects */
CREATE TABLE projects (
    client_id BIGINT NOT NULL,
    project_id BIGINT NOT NULL,
    INDEX(client_id)
);


... now the index on TableA has been optimised for queries against date
ranges on specific project ids which should more or less be sequential
(under a load of other assumptions) - but that reduces the efficiency of
the query under a join with the table "projects".

If you denormalise the table, and update the first index to be on
(client_id, project_id, date) it can end up running far more quickly -
assuming you can access the first mapping anyway - so you're still
storing the first table, with stored procedures to ensure you still have
correct data in all tables.

I'm definitely glossing over the details - but I've definitely got
situations where I've had to choose denormalisation over purity of data.


Rolled-up data tables are other situations - where you know half your
queries are grouping by field "A" it's sometimes a requirement to store
that.


Tim





From mrkafk at gmail.com  Wed Mar  3 12:52:41 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 18:52:41 +0100
Subject: Docstrings considered too complicated
In-Reply-To: <20100303111248.7f40d659.darcy@druid.net>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>
	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>
	<4B8B9845.70604@sequans.com>	<mailman.59.1267456634.23598.python-list@python.org>	<7v695nFa0fU1@mid.individual.net>	<4B8E7538.2080003@mrabarnett.plus.com>
	<20100303111248.7f40d659.darcy@druid.net>
Message-ID: <hmm7l9$m4f$1@dough.gmane.org>

D'Arcy J.M. Cain wrote:

> Makes me want to go down to the basement and fire up the Altair.  :-)

Please don't, or else I fire up that univ Yugoslavian copy of VAX with 
Pascal compiler (where I wrote my first program) and I will start my 
first program of ping-pong.

It was a few hundred lines but took 5 minutes to compile; "VAX" was 
theoretically multitasking, but when more than 3 people were trying to 
do smth on it simultaneously, it was basically seizing up.

Regards,
mk



From e_d_k at yahoo.com  Wed Mar  3 13:01:27 2010
From: e_d_k at yahoo.com (Ed Keith)
Date: Wed, 3 Mar 2010 10:01:27 -0800 (PST)
Subject: Docstrings considered too complicated
In-Reply-To: <20100303114603.7021e9ba.darcy@druid.net>
Message-ID: <539252.91463.qm@web58904.mail.re1.yahoo.com>

--- On Wed, 3/3/10, D'Arcy J.M. Cain  wrote:

> They needed a way to tell where the end of the information
> was.? Why
> they used ^Z (SUB - Substitute) instead of ^C (ETX - End of
> TeXt) or
> even ^D (EOT - End Of Transmission) is anyone's guess.

That has always puzzled me to. ETX and EOT were well established, why no use one of them? I'd love to know what they were thinking.

   -EdK

Ed Keith
e_d_k at yahoo.com

Blog: edkeith.blogspot.com


 


      


From john at castleamber.com  Wed Mar  3 13:04:39 2010
From: john at castleamber.com (John Bokma)
Date: Wed, 03 Mar 2010 12:04:39 -0600
Subject: cpan for python?
References: <mailman.20.1267367545.23598.python-list@python.org>
	<hmjv4b$mqk$1@reader1.panix.com>
	<2010030214473616807-tomfsessile@gmailcom>
	<4b8ddea4$1@dnews.tpgi.com.au> <87ljea9f20.fsf@castleamber.com>
	<45b1599f-a05b-4132-9e75-89a52757e71b@q21g2000yqm.googlegroups.com>
Message-ID: <877hpt46yw.fsf@castleamber.com>

John Gabriele <jmg3000 at gmail.com> writes:

> On Mar 2, 11:58?pm, John Bokma <j... at castleamber.com> wrote:
>> Lie Ryan <lie.1... at gmail.com> writes:
>> > On 03/03/2010 09:47 AM, TomF wrote:
>>
>> [..]
>>
>> >> There
>> >> is also a program called cpan, distributed with Perl. ?It is used for
>> >> searching, downloading, installing and testing modules from the CPAN
>> >> repository. ?It's far more extensive than setuptools. ?AFAIK the python
>> >> community has developed nothing like it.
>>
>> > python have easy_install
>>
>> How easy is it to /remove/ something? ;-) (Last time I checked I read
>> something like "manually remove the .egg"...
>>
>
> Have a look at [pip](http://cheeseshop.python.org/pypi/pip). It should
> support uninstalling packages.

Thanks John. However:

  "Known exceptions include pure-distutils packages installed with
  python setup.py install"

I want to remove something that I installed that way (because it's
installation procedure seems to be broken; opensocial) I understand that
this can't be blamed on pip, but it's odd that in this century it's
still hard to install/uninstall modules :-(

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From steve at holdenweb.com  Wed Mar  3 13:14:18 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 03 Mar 2010 13:14:18 -0500
Subject: taking python enterprise level?...
In-Reply-To: <hmm2jc$28u$1@dough.gmane.org>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>	<20100302015813.5397655e.darcy@druid.net>
	<hmm2jc$28u$1@dough.gmane.org>
Message-ID: <hmm8tv$qb9$1@dough.gmane.org>

mk wrote:
> D'Arcy J.M. Cain wrote:
>> I keep seeing this statement but nothing to back it up.  I have created
>> many apps that run on Python with a PostgreSQL database with a fully
>> normalized schema and I can assure you that database joins were never
>> my problem unless I made a badly constructed query or left off a
>> critical index.
> 
> I too have done that (Python/PGSQL), even adding a complicated layer of
> SQLAlchemy on top of it and have not had issue with this: when I
> profiled one of my apps, it turned out that it spent most of its
> computation time... rendering HTML. Completely unexpected: I expected DB
> to be bottleneck (although it might be that with huge datasets this
> might change).
> 
> Having said that, re evidence that joins are bad: from what I've *heard*
> about Hibernate in Java from people who used it (I haven't used
> Hibernate apart from "hello world"), in case of complicated object
> hierarchies it supposedly generates a lot of JOINs and that supposedly
> kills DB performance.
> 
> So there *may* be some evidence that joins are indeed bad in practice.
> If someone has smth specific/interesting on the subject, please post.
> 
I suspect that this myth is propagated from the distributed database
world: joining tables across two different servers can indeed be
problematic from a performance point of view.

However, the classic advice in database design is to start with a
normalized design and then vary it only if you need to for performance
reasons (which will also involve taking a hit on the coding side,
especially if updates are involved).

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From python at mrabarnett.plus.com  Wed Mar  3 13:15:14 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 03 Mar 2010 18:15:14 +0000
Subject: Docstrings considered too complicated
In-Reply-To: <20100303114603.7021e9ba.darcy@druid.net>
References: <20100224212303.242222c6@geekmail.INVALID>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>
	<kyoevn.k63@spenarnc.xs4all.nl>	<hmk60h$nce$1@reader1.panix.com>
	<7v69rcFcmeU1@mid.individual.net>	<hmltsi$jcd$1@reader1.panix.com>
	<20100303114603.7021e9ba.darcy@druid.net>
Message-ID: <4B8EA732.60408@mrabarnett.plus.com>

D'Arcy J.M. Cain wrote:
> On Wed, 3 Mar 2010 15:05:54 +0000 (UTC)
> Grant Edwards <invalid at invalid.invalid> wrote:
>>> It was actually an improvement over CP/M's file
>>> system. CP/M didn't have hierarchical directories
>> Neither did the original MS-DOS filesystem.
> 
> I think that it always had a hierarchical file system although I am not
> sure about 86-DOS or QDOS on which is was based.
> 
[snip]

MS-DOS had a hierarchical file system from version 2.0.



From mrkafk at gmail.com  Wed Mar  3 13:20:00 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 19:20:00 +0100
Subject: Sort Big File Help
In-Reply-To: <374400.23537.qm@web33805.mail.mud.yahoo.com>
References: <374400.23537.qm@web33805.mail.mud.yahoo.com>
Message-ID: <hmm98g$sdk$1@dough.gmane.org>

John Filben wrote:
> I am new to Python but have used many other (mostly dead) languages in 
> the past.  I want to be able to process *.txt and *.csv files.  I can 
> now read that and then change them as needed ? mostly just take a column 
> and do some if-then to create a new variable.  My problem is sorting 
> these files:
> 
> 1.)    How do I sort file1.txt by position and write out 
> file1_sorted.txt; for example, if all the records are 100 bytes long and 
> there is a three digit id in the position 0-2; here would be some sample 
> data:
> 
> a.       001JohnFilben??
> 
> b.      002Joe  Smith?..

Use a dictionary:

linedict = {}
for line in f:
	key = line[:3]
	linedict[key] = line[3:] # or alternatively 'line' if you want to 
include key in the line anyway

sortedlines = []
for key in linedict.keys().sort():
	sortedlines.append(linedict[key])

(untested)

This is the simplest, and probably inefficient approach. But it should work.

> 
> 2.)    How do I sort file1.csv by column name; for example, if all the 
> records have three column headings, ?id?, ?first_name?, ?last_name?; 
>  here would be some sample data:
> 
> a.       Id, first_name,last_name
> 
> b.      001,John,Filben
> 
> c.       002,Joe, Smith

This is more complicated: I would make a list of lines, where each line 
is a list split according to columns (like ['001', 'John', 'Filben']), 
and then I would sort this list using operator.itemgetter, like this:

lines.sort(key = operator.itemgetter(num)) # where num is the number of 
column, starting with 0 of course

Read up on operator.*, it's very useful.


> 
> 3.)    What about if I have millions of records and I am processing on a 
> laptop with a large external drive ? basically, are there space 
> considerations? What are the work arounds.

The simplest is to use smth like SQLite: define a table, fill it up, and 
then do SELECT with ORDER BY.

But with a million records I wouldn't worry about it, it should fit in 
RAM. Observe:

 >>> a={}
 >>> for i in range(1000000):
...     a[i] = 'spam'*10
...
 >>> sys.getsizeof(a)
25165960

So that's what, 25 MB?

Although I have to note that TEMPORARY ram usage in Python process on my 
machine did go up to 113MB.

Regards,
mk






From detlev at die-offenbachs.de  Wed Mar  3 13:23:16 2010
From: detlev at die-offenbachs.de (Detlev Offenbach)
Date: Wed, 03 Mar 2010 19:23:16 +0100
Subject: Eric4 vs Python3.1
References: <mailman.206.1267634539.23598.python-list@python.org>
Message-ID: <hmm9ek$2vj$1@online.de>

Zhu Sha Zang wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Someone using Eric4 to program with Python3/3.1?
> 
> What can i do, because he insist to use only Python2.6.4.

You can tell it the file extension to use for Python3 files or better yet 
use eric5, which is the Python3 port of eric4 with enhancements.

Detlev

> 
> Att
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v2.0.14 (GNU/Linux)
> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/
> 
> iEYEARECAAYFAkuOZO4ACgkQ35zeJy7JhCjdFACfZrjVa+8O9fu/7FEPr6mVeaEg
> Rm0AmgM+XtuxFH1zUnfkaphF+MgPy3pf
> =MVeJ
> -----END PGP SIGNATURE-----

-- 
Detlev Offenbach
detlev at die-offenbachs.de


From R.Brodie at rl.ac.uk  Wed Mar  3 13:29:06 2010
From: R.Brodie at rl.ac.uk (Richard Brodie)
Date: Wed, 3 Mar 2010 18:29:06 -0000
Subject: Docstrings considered too complicated
References: <mailman.215.1267639293.23598.python-list@python.org>
Message-ID: <hmm9pi$num$1@south.jnrs.ja.net>


"Ed Keith" <e_d_k at yahoo.com> wrote in message 
news:mailman.215.1267639293.23598.python-list at python.org...


> That has always puzzled me to. ETX and EOT were well established,
> why no use one of them? I'd love to know what they were thinking.

It goes back to ancient PDP operating systems, so may well
predate Unix, depending which exact OS was the first to use it.







From python at mrabarnett.plus.com  Wed Mar  3 13:34:51 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 03 Mar 2010 18:34:51 +0000
Subject: Docstrings considered too complicated
In-Reply-To: <20100303111248.7f40d659.darcy@druid.net>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>	<4B8B9845.70604@sequans.com>	<mailman.59.1267456634.23598.python-list@python.org>	<7v695nFa0fU1@mid.individual.net>	<4B8E7538.2080003@mrabarnett.plus.com>
	<20100303111248.7f40d659.darcy@druid.net>
Message-ID: <4B8EABCB.6050303@mrabarnett.plus.com>

D'Arcy J.M. Cain wrote:
> On Wed, 03 Mar 2010 14:42:00 +0000
> MRAB <python at mrabarnett.plus.com> wrote:
>> Gregory Ewing wrote:
>> Mk14 from Science of Cambridge, a kit with hex keypad and 7-segment
>> display, which I had to solder together, and also make my own power
>> supply. I had the extra RAM and the I/O chip, so that's 256B (including
>> the memory used by the monitor) + 256B additional RAM + 128B more in the
>> I/O chip.
> 
> In case some of you youngsters think that there is a typo in the above,
> no, he means a total of 640 bytes.  In today's terms that would be
> approx 0.0000006GB.
> 
> Makes me want to go down to the basement and fire up the Altair.  :-)
> 
There was partial address decoding, so the blocks appeared at several
different places in the address space, the blocks weren't contiguous
(normal RAM at 0xFxx, extra at 0xBxx), and the external address bus was
12 bits.

Not only that, I discovered that one of the bits in the extra RAM
was faulty - stuck at 0 (or was it 1)?

But I was still able to play Nim and Duck Shoot (after keying it in)!
:-)


From mrkafk at gmail.com  Wed Mar  3 13:47:14 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 19:47:14 +0100
Subject: memory usage, temporary and otherwise
Message-ID: <hmmari$2r4$1@dough.gmane.org>


Obviously, don't try this on low-memory machine:

 >>> a={}
 >>> for i in range(10000000):
...     a[i]='spam'*10
...
 >>> import sys
 >>> sys.getsizeof(a)
201326728
 >>> id(a[1])
3085643936L
 >>> id(a[100])
3085713568L

 >>> ids={}
 >>> for i in range(len(a)):
...     ids[id(a[i])]=True
...
 >>> len(ids.keys())
10000000

Hm, apparently Python didn't spot that 'spam'*10 in a's values is really 
the same string, right?

So sys.getsizeof returns some 200MB for this dictionary. But according 
to top RSS of the python process is 300MB. ps auxw says the same thing 
(more or less).

Why the 50% overhead? (and I would swear that a couple of times RSS 
according to top grew to 800MB).

Regards,
mk





From alfps at start.no  Wed Mar  3 13:51:23 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 03 Mar 2010 19:51:23 +0100
Subject: Sample code usable Tkinter listbox
In-Reply-To: <hmf1qo$v9v$1@news.eternal-september.org>
References: <hmf1qo$v9v$1@news.eternal-september.org>
Message-ID: <hmmb3d$fij$1@news.eternal-september.org>

* Alf P. Steinbach:
> In case Someone Else(TM) may need this.
> 
> This code is just how it currently looks, what I needed for my code, so 
> it's not a full-fledged or even tested class.
> 
> But it works.


That code evolved a little to cover more Tk listbox quirks (thanks to Ratingrick 
for the "activestyle"):


<code>
class UsableListbox( t.Frame ):
     def __init__( self, parent_widget ):
         t.Frame.__init__( self, parent_widget )
         scrollbar = t.Scrollbar( self, orient = "vertical" )
         self.lb = t.Listbox(
             self,
             exportselection = 0, activestyle = "none", selectmode = "browse",
             yscrollcommand = scrollbar.set
             )
         scrollbar.config( command = self.lb.yview )
         scrollbar.pack( side = "right", fill = "y" )
         self.lb.pack( side = "left", fill = "both", expand = 1 )

     def current_index( self ):
         indices = self.lb.curselection()
         assert( len( indices ) <= 1 )       # TODO: about multi-selection.
         return None if len( indices ) == 0 else int( indices[0] )

     def item_at( self, i ):
         assert( 0 <= i < self.item_count() )
         return "" if i is None else self.lb.get( i )

     def current( self ):
         #return self.lb.get( "active" )     # Incorrect with mousing
         return self.item_at( self.current_index() )

     def item_count( self ):
         return self.lb.size()

     def clear( self ):
         self.lb.delete( 0, "end" )

     def append( self, item ):
         self.lb.insert( "end", item )
         return self.item_count() - 1

     def scroll_into_view( self, i ):
         self.lb.see( i )

     def select_item( self, i ):
         assert( 0 <= i < self.item_count() )
         old_i = self.current_index();
         self.scroll_into_view( i )
         if old_i is not None and old_i == i:
             return
         self.lb.selection_set( i )
         if old_i is not None:
             self.lb.selection_clear( old_i )

     def add_selection_event_handler( self, handler ):
         "An event handler takes one argument, a Tkinter Event"
         return self.lb.bind( "<<ListboxSelect>>", handler )
</code>


Cheers,

- Alf


From robert.kern at gmail.com  Wed Mar  3 13:51:34 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 03 Mar 2010 12:51:34 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <hmm5ln$arg$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>
	<hmm5ln$arg$1@news.eternal-september.org>
Message-ID: <hmmb3n$3p0$1@dough.gmane.org>

On 2010-03-03 11:18 AM, Alf P. Steinbach wrote:
> * Robert Kern:
>> On 2010-03-03 09:56 AM, Alf P. Steinbach wrote:
>>> * Mike Kent:
>>>> What's the compelling use case for this vs. a simple try/finally?
>>>
>>> if you thought about it you would mean a simple "try/else". "finally" is
>>> always executed. which is incorrect for cleanup
>>
>> Eh? Failed execution doesn't require cleanup? The example you gave is
>> definitely equivalent to the try: finally: that Mike posted.
>
> Sorry, that's incorrect: it's not.
>
> With correct code (mine) cleanup for action A is only performed when
> action A succeeds.
>
> With incorrect code cleanup for action A is performed when A fails.

Oh?

$ cat cleanup.py

class Cleanup:
     def __init__( self ):
         self._actions = []

     def call( self, action ):
         assert( callable( action ) )
         self._actions.append( action )

     def __enter__( self ):
         return self

     def __exit__( self, x_type, x_value, x_traceback ):
         while( len( self._actions ) != 0 ):
             try:
                 self._actions.pop()()
             except BaseException as x:
                 raise AssertionError( "Cleanup: exception during cleanup" )

def print_(x):
     print x

with Cleanup() as at_cleanup:
     at_cleanup.call(lambda: print_("Cleanup executed without an exception."))

with Cleanup() as at_cleanup:
     at_cleanup.call(lambda: print_("Cleanup execute with an exception."))
     raise RuntimeError()

$ python cleanup.py
Cleanup executed without an exception.
Cleanup execute with an exception.
Traceback (most recent call last):
   File "cleanup.py", line 28, in <module>
     raise RuntimeError()
RuntimeError

>> The actions are always executed in your example,
>
> Sorry, that's incorrect.

Looks like it to me.

>> From your post, the scope guard technique is used "to ensure some
>> desired cleanup at the end of a scope, even when the scope is exited
>> via an exception." This is precisely what the try: finally: syntax is
>> for.
>
> You'd have to nest it. That's ugly. And more importantly, now two people
> in this thread (namely you and Mike) have demonstrated that they do not
> grok the try functionality and manage to write incorrect code, even
> arguing that it's correct when informed that it's not, so it's a pretty
> fragile construct, like goto.

Uh-huh.

>> The with statement allows you to encapsulate repetitive boilerplate
>> into context managers, but a general purpose context manager like your
>> Cleanup class doesn't take advantage of this.
>
> I'm sorry but that's pretty meaningless. It's like: "A house allows you
> to encapsulate a lot of stinking garbage, but your house doesn't take
> advantage of that, it's disgustingly clean". Hello.

No, I'm saying that your Cleanup class is about as ugly as the try: finally:. It 
just shifts the ugliness around. There is a way to use the with statement to 
make things look better and more readable in certain situations, namely where 
there is some boilerplate that you would otherwise repeat in many places using 
try: finally:. You can encapsulate that repetitive code into a class or a 
@contextmanager generator and just call the contextmanager. A generic context 
manager where you register callables doesn't replace any boilerplate. You still 
repeat all of the cleanup code everywhere. What's more, because you have to 
shove everything into a callable, you have significantly less flexibility than 
the try: finally:.

I will admit that you can put the cleanup code closer to the code that needs to 
get cleaned up, but you pay a price for that.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From mrkafk at gmail.com  Wed Mar  3 13:54:52 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 19:54:52 +0100
Subject: Generic singleton
Message-ID: <hmmb9t$4d6$1@dough.gmane.org>

Hello,

So I set out to write generic singleton, i.e. the one that would do a 
singleton with attributes of specified class. At first:

class Singleton(object):

     instance = None

     def __new__(cls, impclass, *args, **kwargs):
         if cls.instance is None:
             cls.instance = impclass.__new__(impclass, *args, **kwargs)
         return cls.instance

s1 = Singleton(dict)
s2 = Singleton(dict)

s1['spam']='wonderful'

print s1, s2
print id(s1) == id(s2)


Now, this works. But this obviously doesn't allow class of singleton to 
be changed, or a new singleton for another class to be created. So:


class Singleton(object):

     instd = {}

     def __new__(cls, impclass, *args, **kwargs):
         impid = id(impclass)
         if not cls.instd.has_key(impid):
             cls.instd[impid] = impclass.__new__(impclass, *args, **kwargs)
         return cls.instd[impid]

s1 = Singleton(dict)
s2 = Singleton(dict)
s1['spam']='wonderful'


s3 = Singleton(list)
s4 = Singleton(list)
s3.append('eggs')

print id(s1) == id(s2)
print id(s3) == id(s4)

print s1, s2, s3, s4


Questions:

1. Is this safe? That is, does every builtin class have unique id? I 
have found this in docs:

hashable
..
     All of Python?s immutable built-in objects are hashable, while no 
mutable containers (such as lists or dictionaries) are.

Well ok, hashable they're not; but apparently at least dict and list 
have id()?

 >>> id(list)
135709728
 >>> id(dict)
135714560
 >>> id(dict)
135714560
 >>> c=dict
 >>> id(c)
135714560


2. Drawbacks?

3. Better/fancier way to do this?

Regards,
mk





From python at mrabarnett.plus.com  Wed Mar  3 14:09:18 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 03 Mar 2010 19:09:18 +0000
Subject: NoSQL Movement?
In-Reply-To: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
Message-ID: <4B8EB3DE.8070003@mrabarnett.plus.com>

Xah Lee wrote:
> recently i wrote a blog article on The NoSQL Movement
> at http://xahlee.org/comp/nosql.html
> 
> i'd like to post it somewhere public to solicit opinions, but in the
> 20 min or so, i couldn't find a proper newsgroup, nor private list
> that my somewhat anti-NoSQL Movement article is fitting.
> 
> So, i thought i'd post here to solicit some opinins from the programer
> community i know.
> 
[snip]
Couldn't find a relevant newsgroup, so decided to inflict it on a number
of others...


From philip at semanchuk.com  Wed Mar  3 14:15:26 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Wed, 3 Mar 2010 14:15:26 -0500
Subject: taking python enterprise level?...
In-Reply-To: <hmm2jc$28u$1@dough.gmane.org>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>
	<20100302015813.5397655e.darcy@druid.net>
	<hmm2jc$28u$1@dough.gmane.org>
Message-ID: <973824D8-3020-44A8-B2DA-501FF530457B@semanchuk.com>


On Mar 3, 2010, at 11:26 AM, mk wrote:

> D'Arcy J.M. Cain wrote:
>> I keep seeing this statement but nothing to back it up.  I have  
>> created
>> many apps that run on Python with a PostgreSQL database with a fully
>> normalized schema and I can assure you that database joins were never
>> my problem unless I made a badly constructed query or left off a
>> critical index.
>
> I too have done that (Python/PGSQL), even adding a complicated layer  
> of SQLAlchemy on top of it and have not had issue with this: when I  
> profiled one of my apps, it turned out that it spent most of its  
> computation time... rendering HTML. Completely unexpected: I  
> expected DB to be bottleneck (although it might be that with huge  
> datasets this might change).
>
> Having said that, re evidence that joins are bad: from what I've  
> *heard* about Hibernate in Java from people who used it (I haven't  
> used Hibernate apart from "hello world"), in case of complicated  
> object hierarchies it supposedly generates a lot of JOINs and that  
> supposedly kills DB performance.
>
> So there *may* be some evidence that joins are indeed bad in  
> practice. If someone has smth specific/interesting on the subject,  
> please post.

It's an unprovable assertion, or a meaningless one depending on how  
one defines the terms. You could also say "there *may* be some  
evidence that Python lists are bad in practice". Python lists and SQL  
JOINs are like any part of a language or toolkit. They're good tools  
for solving certain classes of problems. They can also be misapplied  
to problems that they're not so good at. Sometimes they're a  
performance bottleneck, even when solving the problems for which  
they're best. Sometimes the best way to solve a performance bottleneck  
is to redesign your app/system so you don't need to solve that kind of  
problem anymore (hence the join-less databases). Other times, the cure  
is worse than the disease and you're better off throwing hardware at  
the problem.

My $.02
Philip






From mrkafk at gmail.com  Wed Mar  3 14:21:29 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 20:21:29 +0100
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <7071cfa0-0485-4192-b3ee-8e12d9f1fca2@f17g2000prh.googlegroups.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<mailman.64.1267463648.23598.python-list@python.org>	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>	<7xljebyl56.fsf@ruckus.brouhaha.com>	<mailman.70.1267468806.23598.python-list@python.org>
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>	<7x635fdcth.fsf@ruckus.brouhaha.com>	<mailman.199.1267631220.23598.python-list@python.org>
	<7071cfa0-0485-4192-b3ee-8e12d9f1fca2@f17g2000prh.googlegroups.com>
Message-ID: <hmmcrq$bi0$1@dough.gmane.org>

Steve Howell wrote:
> Somewhere in the 2020s, though, I predict that a lot of technologies
> are either going to finally die off, or at least be restricted to the
> niches that they serve well.  Take Java, for example.  I think it will
> be still be used, and people will still even be writing new programs
> in it, but it will be rightly scorned in a lot of places where it is
> now embraced.  Some of this won't actually be due to technological
> advances, but just changes in perception.  For example, I predict lots
> of programs that people now write in Java will be written in Python,
> even if the core language of Python remains fairly stable.

A friend of mine, and a good Java programmer, says caustically: "Java is 
COBOL of the future".

Where I work we develop a huge application in Websphere (IBM Java-based 
application server). The problems with legacy code made project manager 
joke "perhaps we should rewrite this in Python". Perhaps some day it 
will not be a joke anymore?

Personally, I chose to stay away from Java, even though it would 
temporarily help me: the amount of time & effort it takes to master the 
necessary toolset is *huge*, and my scarce time is better spent 
elsewhere, on more productive tools, and I really, really do not want 
lots of my limited time to go down the drain in a few years.

Take EJB for example: even its creators realized they've overdone it 
with EJB 2 and simplified somewhat EJB 3 and switched to annotations 
instead of gazillion XML formats. But still I dread the thought of 
having to spend so much time learning it before I can do a few lines of 
productive work in it.

In a way it's horrible: all this gargantuan effort in a few years will 
be completely wasted, down the drain. All those developer hours and 
dollars wasted.. In a way, C wasn't as bad as Java has been: at least 
many of C libs, with new bindings, still live on and do work.

> Going back to Paul's statement, I agree that "there should be one and
> only one obvious way to do it" in Python, but I don't think the
> philosophy applies to the greater ecosystem of software development.

+1

Note that when it comes to bigger tools or frameworks, even in the world 
of Python things are not "one obvious way", e.g. Django for quick and 
dirty and small apps, and Pylons for big and powerful apps. There may be 
"one obvious way to do it" in a very, very narrow context, but when 
contexts widen, like, say: "what is web framework I should choose?" the 
answers diverge, because answer has to be variation of "it depends on 
your situation".

> Whether RSON is really an improvement or not is an orthogonal issue to
> whether we should strive for improvement.

+1

Regards,
mk



From alfps at start.no  Wed Mar  3 14:32:25 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 03 Mar 2010 20:32:25 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.221.1267642316.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>
	<mailman.221.1267642316.23598.python-list@python.org>
Message-ID: <hmmdgd$17s$1@news.eternal-september.org>

* Robert Kern:
> On 2010-03-03 11:18 AM, Alf P. Steinbach wrote:
>> * Robert Kern:
>>> On 2010-03-03 09:56 AM, Alf P. Steinbach wrote:
>>>> * Mike Kent:
>>>>> What's the compelling use case for this vs. a simple try/finally?
>>>>
>>>> if you thought about it you would mean a simple "try/else". 
>>>> "finally" is
>>>> always executed. which is incorrect for cleanup
>>>
>>> Eh? Failed execution doesn't require cleanup? The example you gave is
>>> definitely equivalent to the try: finally: that Mike posted.
>>
>> Sorry, that's incorrect: it's not.
>>
>> With correct code (mine) cleanup for action A is only performed when
>> action A succeeds.
>>
>> With incorrect code cleanup for action A is performed when A fails.
> 
> Oh?
> 
> $ cat cleanup.py
> 
> class Cleanup:
>     def __init__( self ):
>         self._actions = []
> 
>     def call( self, action ):
>         assert( callable( action ) )
>         self._actions.append( action )
> 
>     def __enter__( self ):
>         return self
> 
>     def __exit__( self, x_type, x_value, x_traceback ):
>         while( len( self._actions ) != 0 ):
>             try:
>                 self._actions.pop()()
>             except BaseException as x:
>                 raise AssertionError( "Cleanup: exception during cleanup" )
> 
> def print_(x):
>     print x
> 
> with Cleanup() as at_cleanup:
>     at_cleanup.call(lambda: print_("Cleanup executed without an 
> exception."))
> 
> with Cleanup() as at_cleanup:

*Here* is where you should

   1) Perform the action for which cleanup is needed.

   2) Let it fail by raising an exception.


>     at_cleanup.call(lambda: print_("Cleanup execute with an exception."))
>     raise RuntimeError()

With an exception raised here cleanup should of course be performed.

And just in case you didn't notice: the above is not a test of the example I gave.


> $ python cleanup.py
> Cleanup executed without an exception.
> Cleanup execute with an exception.
> Traceback (most recent call last):
>   File "cleanup.py", line 28, in <module>
>     raise RuntimeError()
> RuntimeError
> 
>>> The actions are always executed in your example,
>>
>> Sorry, that's incorrect.
> 
> Looks like it to me.

I'm sorry, but you're

  1) not testing my example which you're claiming that you're testing, and

  2) not even showing anything about your earlier statements, which were
     just incorrect.

You're instead showing that my code works as it should for the case that you're 
testing, which is a bit unnecessary since I knew that, but thanks anyway.

I'm not sure what that shows, except that you haven't grokked this yet.


>>> From your post, the scope guard technique is used "to ensure some
>>> desired cleanup at the end of a scope, even when the scope is exited
>>> via an exception." This is precisely what the try: finally: syntax is
>>> for.
>>
>> You'd have to nest it. That's ugly. And more importantly, now two people
>> in this thread (namely you and Mike) have demonstrated that they do not
>> grok the try functionality and manage to write incorrect code, even
>> arguing that it's correct when informed that it's not, so it's a pretty
>> fragile construct, like goto.
> 
> Uh-huh.

Yeah. Consider that you're now for the third time failing to grasp the concept 
of cleanup for a successful operation.


>>> The with statement allows you to encapsulate repetitive boilerplate
>>> into context managers, but a general purpose context manager like your
>>> Cleanup class doesn't take advantage of this.
>>
>> I'm sorry but that's pretty meaningless. It's like: "A house allows you
>> to encapsulate a lot of stinking garbage, but your house doesn't take
>> advantage of that, it's disgustingly clean". Hello.
> 
> No, I'm saying that your Cleanup class is about as ugly as the try: 
> finally:. It just shifts the ugliness around. There is a way to use the 
> with statement to make things look better and more readable in certain 
> situations, namely where there is some boilerplate that you would 
> otherwise repeat in many places using try: finally:. You can encapsulate 
> that repetitive code into a class or a @contextmanager generator and 
> just call the contextmanager. A generic context manager where you 
> register callables doesn't replace any boilerplate. You still repeat all 
> of the cleanup code everywhere. What's more, because you have to shove 
> everything into a callable, you have significantly less flexibility than 
> the try: finally:.

Sorry, but that's meaningless again. You're repeating that my house has no 
garbage in it. And you complain that it would be work to add garbage to it. Why 
do you want that garbage? I think it's nice without it!


> I will admit that you can put the cleanup code closer to the code that 
> needs to get cleaned up, but you pay a price for that.

Yes, that's an additional point, and important. I forgot to mention it. Thanks!


Cheers & hth.,

- Alf


From bthate at gmail.com  Wed Mar  3 14:33:02 2010
From: bthate at gmail.com (Bart Thate)
Date: Wed, 3 Mar 2010 11:33:02 -0800 (PST)
Subject: GZRBOT 0.2 BETA1 released
Message-ID: <9e26a4b7-cec6-4f73-bcd2-5fe95aa8647c@y17g2000yqd.googlegroups.com>

Hello World !

Welcome to the world of Active API ;]

Google released their new Wave API so i quickly ported GZRBOT to the
new API. Now we can finally push to waves instead of using polling.
This makes pushing feeds to waves possible, and this is one of the
main things GZRBOT can do. We now use pubsubhubbub service provided by
superfeedr.com to fetch our RSS and Atom feeds for us and have them
pushed to the bot, which we then forward to the waves that have been
subscribed ( or jabber clients for that matter)

This release is BETA1 which doesnt mean the code is fixed yet as
BETA2,3,4 and RC1, 2, 3 etc are still ahead before 0.2 is released. So
this is kind of bleeding edge and you might want to wait for 0.2.1 or
so ;]

If you like to play around with wave/jabber bots on GAE then this is
the bot for you.

Code is at the mercurial repo:

hg clone http://gzrbot.googlecode.com/hg

Or download the tarball at http://gzrbot.googlecode.com

Basic documentation is at http://gozerbot.org/gzrdoc and i made a wave
available if you want to try the bot with me or have questions and
such:

https://wave.google.com/wave/#restored:wave:googlewave.com!w%252B51rssVscD

Hope you enjoy it !

Bart


about GZRBOT:

GZRBOT is a general purpose bot for wave, web and xmpp. It uses a
plugin
structure to provide easy programming of commands and callbacks,
allowing
you to implement your own "killer plugin".

GZRBOT comes with some plugins provided, for example:

- Hubbub plugin that uses superfeedr.com to get RSS feed pushed
instead of
pulling them ourselves. This lowers the load on the bot considerably.
A
max of 1000 feeds is for free.

- Watcher plugin that let you watch waves, get notified in jabber when
your
waves updates. (the bots sends the updated txt)

- Wave plugin that provides help with wave management. I'm working
on wave cloning after say x blips, so that larger conversations can be
created in google wave. UNDER DEVELOPMENT

- This is mostly needed for the last plugin i want to mention and that
is
the gozernet plugin. The plugin allows for relaying of events between
GZRBOT (Wave/Web/XMPP) and GOZERBOT (IRC/Jabber). IRC and Wave can be
bridged this way. UNDER DEVELOPMENT

GZRBOT is free code (BSD) and can be cloned as needed ;]

note: as of 0.2 GZRBOT uses the new v2 Wave API and thus needs
registration with google.


From robert.kern at gmail.com  Wed Mar  3 14:33:43 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 03 Mar 2010 13:33:43 -0600
Subject: Pylint Argument number differs from overridden method
In-Reply-To: <2484ca6e-0eb9-4e0c-a7db-d035badab711@t20g2000yqe.googlegroups.com>
References: <2484ca6e-0eb9-4e0c-a7db-d035badab711@t20g2000yqe.googlegroups.com>
Message-ID: <hmmdin$dns$1@dough.gmane.org>

On 2010-03-03 11:39 AM, Wanderer wrote:
> Pylint W0221 gives the warning
> Argument number differs from overridden method.
>
> Why is this a problem? I'm overriding the method to add additional
> functionality.

There are exceptions to every guideline. Doing this could easily be a mistake, 
so it's one of the many things that Pylint checks for. Silence the warning if 
you like.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From stefan_ml at behnel.de  Wed Mar  3 14:35:01 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 03 Mar 2010 20:35:01 +0100
Subject: SOAP 1.2 Python client ?
In-Reply-To: <5a36bd30-6cbd-48ca-9ca3-dc34c97e03c0@o30g2000yqb.googlegroups.com>
References: <5a36bd30-6cbd-48ca-9ca3-dc34c97e03c0@o30g2000yqb.googlegroups.com>
Message-ID: <hmmdl5$ekd$1@dough.gmane.org>

BlueBird, 03.03.2010 17:32:
> I am looking for a SOAP 1.2 python client. To my surprise, it seems
> that this does not exist. Does anybody know about this ?

SOAP may be an overly bloated protocol, but it's certainly not black magic. 
It's not hard to do manually if you really need to:

http://effbot.org/zone/element-soap.htm

Stefan



From steve at holdenweb.com  Wed Mar  3 14:38:16 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 03 Mar 2010 14:38:16 -0500
Subject: Docstrings considered too complicated
In-Reply-To: <hmm7l9$m4f$1@dough.gmane.org>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>	<4B8B9845.70604@sequans.com>	<mailman.59.1267456634.23598.python-list@python.org>	<7v695nFa0fU1@mid.individual.net>	<4B8E7538.2080003@mrabarnett.plus.com>	<20100303111248.7f40d659.darcy@druid.net>
	<hmm7l9$m4f$1@dough.gmane.org>
Message-ID: <hmmdrf$fco$1@dough.gmane.org>

mk wrote:
> D'Arcy J.M. Cain wrote:
> 
>> Makes me want to go down to the basement and fire up the Altair.  :-)
> 
> Please don't, or else I fire up that univ Yugoslavian copy of VAX with
> Pascal compiler (where I wrote my first program) and I will start my
> first program of ping-pong.
> 
> It was a few hundred lines but took 5 minutes to compile; "VAX" was
> theoretically multitasking, but when more than 3 people were trying to
> do smth on it simultaneously, it was basically seizing up.
> 
> Regards,
> mk
> 
Puts me in mind of Mario Wolczko's early attempts to implement SmallTalk
on a VAX 11/750. The only bitmapped display we had available was a Three
Rivers PERQ, connected by a 9600bps serial line. We left it running at
seven o'clock one evening, and by nine am the next day it had brought up
about two thirds of the initial VM loader screen ...

You tell these young kids, and they just don't believe you!

regards
 Steve

-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From mrkafk at gmail.com  Wed Mar  3 14:39:35 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 20:39:35 +0100
Subject: taking python enterprise level?...
In-Reply-To: <1267638602.988.19.camel@localhost>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>	<20100302015813.5397655e.darcy@druid.net>	<hmm2jc$28u$1@dough.gmane.org>
	<1267638602.988.19.camel@localhost>
Message-ID: <hmmdtn$fkn$1@dough.gmane.org>

Hello Tim,

Pardon the questions but I haven't had the need to use denormalization 
yet, so:

Tim Wintle wrote:

> /*   Table A    */
> CREATE TABLE TableA (
>     project_id BIGINT NOT NULL,
>     cost INT,
>     date DATETIME,
>     PRIMARY KEY (project_id, date)
> );
> 
> /* Table projects */
> CREATE TABLE projects (
>     client_id BIGINT NOT NULL,
>     project_id BIGINT NOT NULL,
>     INDEX(client_id)
> );
> 
> 
> .... now the index on TableA has been optimised for queries against date
> ranges on specific project ids which should more or less be sequential
> (under a load of other assumptions) - but that reduces the efficiency of
> the query under a join with the table "projects".
> 
> If you denormalise the table, and update the first index to be on
> (client_id, project_id, date) it can end up running far more quickly -

IOW you basically merged the tables like follows?

CREATE TABLE projects (
     client_id BIGINT NOT NULL,
     project_id BIGINT NOT NULL,
     cost INT,
     date DATETIME,
     INDEX(client_id, project_id, date)
);

 From what you write further in the mail I conclude that you have not 
eliminated the first table, just made table projects look like I wrote 
above, right? (and used stored procedures to make sure that both tables 
contain the relevant data for client_id and project_id columns in both 
tables)

Have you had some other joins on denormalized keys? i.e. in example how 
the join of hypothetical TableB with projects on projects.client_id 
behave with such big tables? (bc I assume that you obviously can't 
denormalize absolutely everything, so this implies the need of doing 
some joins on denormalized columns like client_id).

> assuming you can access the first mapping anyway -

? I'm not clear on what you mean here.

> so you're still
> storing the first table, with stored procedures to ensure you still have
> correct data in all tables.

Regards,
mk



From mrkafk at gmail.com  Wed Mar  3 14:44:08 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 20:44:08 +0100
Subject: Docstrings considered too complicated
In-Reply-To: <539252.91463.qm@web58904.mail.re1.yahoo.com>
References: <20100303114603.7021e9ba.darcy@druid.net>
	<539252.91463.qm@web58904.mail.re1.yahoo.com>
Message-ID: <hmme68$glb$1@dough.gmane.org>

Ed Keith wrote:
> --- On Wed, 3/3/10, D'Arcy J.M. Cain  wrote:
> 
>> They needed a way to tell where the end of the information
>> was.  Why
>> they used ^Z (SUB - Substitute) instead of ^C (ETX - End of
>> TeXt) or
>> even ^D (EOT - End Of Transmission) is anyone's guess.
> 
> That has always puzzled me to. ETX and EOT were well established, why no use one of them? I'd love to know what they were thinking.

Probably nothing: what many people do with confronted with a problem.

It reminds me of why Windows uses backslashes for path separation 
instead of slashes: what I've *heard*, and do not know if it's true, 
it's because Gates fancied using / for options switch instead of -, and 
to hell with established practice.

Regards,
mk



From arnodel at googlemail.com  Wed Mar  3 14:44:41 2010
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Wed, 03 Mar 2010 19:44:41 +0000
Subject: Generic singleton
References: <mailman.222.1267642515.23598.python-list@python.org>
Message-ID: <m2iq9d197a.fsf@googlemail.com>

mk <mrkafk at gmail.com> writes:
[...]
> hashable
> ..
>     All of Python?s immutable built-in objects are hashable, while no
> mutable containers (such as lists or dictionaries) are.
>
> Well ok, hashable they're not; but apparently at least dict and list
> have id()?

lists and dicts are not hashable, but their types are:

>>> hash(dict)
4296155808
>>> hash(list)
4296151808

So just use the type as the key to the dictionary you maintain in your
singleton.  But the question is what you use your singleton for.

-- 
Arnaud


From mrkafk at gmail.com  Wed Mar  3 14:46:24 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 20:46:24 +0100
Subject: cpan for python?
In-Reply-To: <877hpt46yw.fsf@castleamber.com>
References: <mailman.20.1267367545.23598.python-list@python.org>	<hmjv4b$mqk$1@reader1.panix.com>	<2010030214473616807-tomfsessile@gmailcom>	<4b8ddea4$1@dnews.tpgi.com.au>
	<87ljea9f20.fsf@castleamber.com>	<45b1599f-a05b-4132-9e75-89a52757e71b@q21g2000yqm.googlegroups.com>
	<877hpt46yw.fsf@castleamber.com>
Message-ID: <hmmeag$glb$2@dough.gmane.org>

John Bokma wrote:
> I want to remove something that I installed that way (because it's
> installation procedure seems to be broken; opensocial) I understand that
> this can't be blamed on pip, but it's odd that in this century it's
> still hard to install/uninstall modules :-(

Have you looked in a file easy-install.pth in site-packages? In my 
experience it's enough to delete the line for package from there and 
delete package's egg or directory.

I agree that this is kind of backward, though.

Regards,
mk



From MLMDev at Comcast.net  Wed Mar  3 14:54:04 2010
From: MLMDev at Comcast.net (Mitchell L Model)
Date: Wed, 3 Mar 2010 14:54:04 -0500
Subject: CGI, POST, and file uploads
In-Reply-To: <mailman.1075.1267566496.23597.python-list@python.org>
References: <mailman.1075.1267566496.23597.python-list@python.org>
Message-ID: <67C7A291-6790-4B10-8797-D95F8AD36F9C@Comcast.net>


On Mar 2, 2010, at 4:48 PM, I wrote:

> Can someone tell me how to upload the contents of a (relatively  
> small) file using an HTML form and CGI in Python 3.1? As far as I  
> can tell from a half-day of experimenting, browsing, and searching  
> the Python issue tracker, this is broken.

followed by a detailed example demonstrating the problem.

Having hear no response, let me clarify that this request was  
preliminary to filing a bug report -- I wanted to make sure I wasn't  
missing something here. If nothing else, this failure should be  
documented rather than the 3.1 library documentation continuing to  
describe how to upload file contents with POST. If someone thinks  
there is a way to make this work in 3.1, or that it isn't a bug  
because CGI is hopeless (i.e., non-WSGI-compliant), or that the  
documentation shouldn't be changed, please respond. I'd rather have  
this particular discussion here than in the bug tracking system.

Meanwhile, let me heartily recommend the Bottle Web Framework (http://bottle.paws.de 
) for its simplicity, flexibility, and power. Very cool stuff. To make  
it work in Python3.1, do the following:
	1. run 2to3 on bottle.py (the only file there is to download)
	2. copy or move the resulting bottle.py to the site-libs directory in  
your Python installation's library directory
	3. don't use request.GET.getone or request.POST.getone -- instead of  
getone, use get (the protocol changed to that of the Mapping ABC from  
the collections module)
	4. the contents of a file will be returned inside a cgi.FieldStorage  
object, so you need to add '.value' after the call to get in that case



From drobinow at gmail.com  Wed Mar  3 14:54:27 2010
From: drobinow at gmail.com (David Robinow)
Date: Wed, 3 Mar 2010 14:54:27 -0500
Subject: Docstrings considered too complicated
In-Reply-To: <539252.91463.qm@web58904.mail.re1.yahoo.com>
References: <20100303114603.7021e9ba.darcy@druid.net>
	<539252.91463.qm@web58904.mail.re1.yahoo.com>
Message-ID: <4eb0089f1003031154j78cc7d22kf18ae339fe8c686@mail.gmail.com>

On Wed, Mar 3, 2010 at 1:01 PM, Ed Keith <e_d_k at yahoo.com> wrote:
> --- On Wed, 3/3/10, D'Arcy J.M. Cain ?wrote:
>
>> They needed a way to tell where the end of the information
>> was.? Why
>> they used ^Z (SUB - Substitute) instead of ^C (ETX - End of
>> TeXt) or
>> even ^D (EOT - End Of Transmission) is anyone's guess.
>
> That has always puzzled me to. ETX and EOT were well established, why no use one of them? I'd love to know what they were thinking.

There were numerous incompatible and primitive transfer protocols in
those days. They probably wanted to pick something that was NOT well
established so it would pass through without, for example, causing End
Of Transmission.


From python at mrabarnett.plus.com  Wed Mar  3 14:59:22 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 03 Mar 2010 19:59:22 +0000
Subject: Sort Big File Help
In-Reply-To: <hmm98g$sdk$1@dough.gmane.org>
References: <374400.23537.qm@web33805.mail.mud.yahoo.com>
	<hmm98g$sdk$1@dough.gmane.org>
Message-ID: <4B8EBF9A.6080603@mrabarnett.plus.com>

mk wrote:
> John Filben wrote:
>> I am new to Python but have used many other (mostly dead) languages in 
>> the past.  I want to be able to process *.txt and *.csv files.  I can 
>> now read that and then change them as needed ? mostly just take a 
>> column and do some if-then to create a new variable.  My problem is 
>> sorting these files:
>>
>> 1.)    How do I sort file1.txt by position and write out 
>> file1_sorted.txt; for example, if all the records are 100 bytes long 
>> and there is a three digit id in the position 0-2; here would be some 
>> sample data:
>>
>> a.       001JohnFilben??
>>
>> b.      002Joe  Smith?..
> 
> Use a dictionary:
> 
> linedict = {}
> for line in f:
>     key = line[:3]
>     linedict[key] = line[3:] # or alternatively 'line' if you want to 
> include key in the line anyway
> 
> sortedlines = []
> for key in linedict.keys().sort():
>     sortedlines.append(linedict[key])
> 
> (untested)
> 
> This is the simplest, and probably inefficient approach. But it should 
> work.
> 
[snip]
Simpler would be:

     lines = f.readlines()
     lines.sort(key=lambda line: line[ : 3])

or even:

     lines = sorted(f.readlines(), key=lambda line: line[ : 3]))



From invalid at invalid.invalid  Wed Mar  3 15:02:28 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Wed, 3 Mar 2010 20:02:28 +0000 (UTC)
Subject: Docstrings considered too complicated
References: <20100303114603.7021e9ba.darcy@druid.net>
	<539252.91463.qm@web58904.mail.re1.yahoo.com>
	<mailman.230.1267645508.23598.python-list@python.org>
Message-ID: <hmmf8k$5vl$1@reader1.panix.com>

On 2010-03-03, mk <mrkafk at gmail.com> wrote:

>> That has always puzzled me to. ETX and EOT were well established, why
>> no use one of them? I'd love to know what they were thinking.
>
> Probably nothing: what many people do with confronted with a problem.
>
> It reminds me of why Windows uses backslashes for path separation 
> instead of slashes: what I've *heard*, and do not know if it's true, 
> it's because Gates fancied using / for options switch instead of -,
> and to hell with established practice.

Using / for the option switch _was_ the established practice (if you
came from a DEC background the way that CP/M and DOS did).

-- 
Grant Edwards               grant.b.edwards        Yow! Boy, am I glad it's
                                  at               only 1971...
                              gmail.com            


From benjamin.kaplan at case.edu  Wed Mar  3 15:12:31 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 3 Mar 2010 15:12:31 -0500
Subject: Installing Scrapy on Mac OS X 10.6
In-Reply-To: <9b08574f-0410-45bc-89af-0d3cf7d21819@e7g2000yqf.googlegroups.com>
References: <9b08574f-0410-45bc-89af-0d3cf7d21819@e7g2000yqf.googlegroups.com>
Message-ID: <ec96e1391003031212m6afc142ah644ba71edb3895d6@mail.gmail.com>

On Wed, Mar 3, 2010 at 12:06 PM, Sky Larking <skylarking11 at gmail.com> wrote:

> Has anyone successfully installed Scrapy ( http://scrapy.org ) on a
> Mac OS X machine running 10.6.x? The Documentaion says
> Mac OS X ships an libxml2 version too old to be used by Scrapy...But
> doesn't say which version of OS X.. I am wondering if the version of
> libxml2 is also not compatible..
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Looks like it's shipping with 2.7.3. Scrappy requires 2.6.28 so it should
work but I haven't tried.
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From tjreedy at udel.edu  Wed Mar  3 15:18:26 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 03 Mar 2010 15:18:26 -0500
Subject: Re Interest check in some delicious syntactic sugar for
	"except:pass"
In-Reply-To: <35e00b331003030347x30f3f2faua96a9b72814743da@mail.gmail.com>
References: <35e00b331003030347x30f3f2faua96a9b72814743da@mail.gmail.com>
Message-ID: <hmmg6i$o9o$1@dough.gmane.org>

On 3/3/2010 6:47 AM, Oren Elrad wrote:

> With that said, let me at least offer a token defense of my position.
> By way of motivation, I wrote that email after copying/pasting the
> following a few times around a project until I wrote it into def
> SilentlyDelete() and its cousin SilentlyRmdir()
>
> """ code involving somefile """
> try:
> ........os.remove(somefile)
> except:
> .......pass     # The bloody search indexer has got the file and I
> can't delete it. Nothing to be done.
>
> Certainly the parade of horribles (bad files! corrupt data! syntax
> errors!) is a tad melodramatic. Either os.remove() succeeds or it
> doesn't and the execution path (in the estimation of this programmer,
> at least) is not at all impacted by whether it succeeds or fails. I
> know with certainty at compile time what exceptions might be raised
> and what the consequences of passing them are and there is no sense
> pestering the user or sweating over it. Nor can I see the logic, as
> was suggested, in writing "except OSError:" since (seems to me) mere
> surplusage -- it neither causes a semantic difference in the way the
> program runs nor provides anything useful to the reader.

Suppose you misspell 'somefile' or 'remove' (or the file gets corrupted 
somehow -- which unfortunate can happen). Now you suppress the NameError 
or AttributeError, which is a mistake. Suppose someone copies your code 
into a context where 'os' is not imported or where 'os' is a variable 
(for bone type, for instance). More bad error suppression.

Bare excepts seem ok for experimental, draft, or throwaway code, but 
somewhat dubious for production code.

For anyone reading your code a few years from now, 'except OSError' 
would be clearer that that is all you mean to pass on.

Wrapping the code in a function makes the overhead of adding 'OSError' 
trivial. It also makes it trivial to do something different, like adding 
the file to a collection to be retried later. It also reduces the points 
of possible corruption to one instead of many.

Terry Jan Reedy



From tjreedy at udel.edu  Wed Mar  3 15:47:11 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 03 Mar 2010 15:47:11 -0500
Subject: Which mock library do you prefer?
In-Reply-To: <kypi0m.i9s@spenarnc.xs4all.nl>
References: <f3baba98-a0fc-4c6a-9fff-661da8356bc0@h2g2000yqj.googlegroups.com>	<485b80f9-96c7-4946-8f38-44eb7d81fe1d@z19g2000yqk.googlegroups.com>	<87sk90c499.fsf@benfinney.id.au>	<e88f4781-4b1f-4a9d-8c61-3a13c854c280@d27g2000yqn.googlegroups.com>
	<kypi0m.i9s@spenarnc.xs4all.nl>
Message-ID: <hmmhsf$uk5$1@dough.gmane.org>

On 3/3/2010 7:43 AM, Albert van der Horst wrote:

>> Right, isolation is essential. But I can't decide to which extent I
>> should propagate isolation.
>> For example, in "Python Testing: Beginner's Guide" by Daniel Arbuckle,
>> author suggests that if you do unittesting you should isolate the
>> smallest units of code from each other. For example, if you have a
>> class:
>> Class SomeClass(object):
>>     def method1(self):
>>         return 5
>>     def method2(self):
>>         return self.method1 + 10
>>
>> According to the book, if you want to test method2, you should isolate
>> it from method1 and class instance('self').
>> Other books are not so strict...
>>
>> And what should I follow as newbie?

Pretty much any test assumes that basic things other than the tested 
object work correctly. For instance, any test of method2 will assume 
that '+' works correctly. The dependency graph between methods in a 
class will nearly always be acyclic. So I would start with the 'leaf' 
methods and work up. In the above case, test method1 first and then 
method2. The dependence of the test of method2 on the correctness of 
method1 is hardly worse, to me, then its dependence on the correctness 
of int.__add__. It is just the the responsibility for the latter falls 
on the developers, and *their* suite of tests.

Whenever any code test fails, there are two possibilities. The code 
itself is buggy, or something it depends on is buggy. I see two reasons 
for isolation and mock units: test resource saving (especially time) and 
independent development. If you are developing ClassA and someone else 
is developing ClassB, you might want to test ClassA even though it 
depends on ClassB and classB is not ready yet. This consideration is 
much less likely to apply to method2 versus method1 of a coherent class.

My current opinions.

Terry Jan Reedy





From cartercc at gmail.com  Wed Mar  3 15:54:53 2010
From: cartercc at gmail.com (ccc31807)
Date: Wed, 3 Mar 2010 12:54:53 -0800 (PST)
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
Message-ID: <fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>

On Mar 3, 12:36?pm, Xah Lee <xah... at gmail.com> wrote:
> recently i wrote a blog article on The NoSQL Movement
> athttp://xahlee.org/comp/nosql.html
>
> i'd like to post it somewhere public to solicit opinions, but in the
> 20 min or so, i couldn't find a proper newsgroup, nor private list
> that my somewhat anti-NoSQL Movement article is fitting.

I only read the first two paragraphs of your article, so I can't
respond to it.

I've halfway followed the NoSQL movement. My day job is a database
manager and I so SQL databases for a living, as well as Perl. I see a
lot of abuse of relational databases in the Real World, as well as a
lot of abuse for non-SQL alternatives, e.g., (mis)using Excel for a
database. The big, enterprise database we have at work is built on IBM
UniQuery, which is a non-SQL flat file database product, so I've had a
lot of experience with big non-SQL database work.

I've also developed a marked preference for plain text databases. For
a lot of applications they are simpler, easier, and better. I've also
had some experience with XML databases, and find that they are ideal
for applications with 'ragged' data.

As with anything else, you need to match the tool to the job. Yes, I
feel that relational database technology has been much used, and much
abused. However, one of my favorite applications is Postgres, and I
think it's absolutely unbeatable where you have to store data and
perform a large number of queries.

Finally, with regard to Structured Query Language itself, I find that
it's well suited to its purpose. I hand write a lot of SQL statements
for various purposes, and while like any language you find it
exceedingly difficult to express concepts that you can think, it
mostly allows the expression of most of what you want to say.

CC.


From mrkafk at gmail.com  Wed Mar  3 15:58:15 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 21:58:15 +0100
Subject: taking python enterprise level?...
In-Reply-To: <973824D8-3020-44A8-B2DA-501FF530457B@semanchuk.com>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>	<20100302015813.5397655e.darcy@druid.net>	<hmm2jc$28u$1@dough.gmane.org>
	<973824D8-3020-44A8-B2DA-501FF530457B@semanchuk.com>
Message-ID: <hmmih7$1bs$1@dough.gmane.org>

Philip Semanchuk wrote:
>> So there *may* be some evidence that joins are indeed bad in practice. 
>> If someone has smth specific/interesting on the subject, please post.
> 
> It's an unprovable assertion, or a meaningless one depending on how one 
> defines the terms. You could also say "there *may* be some evidence that 
> Python lists are bad in practice". Python lists and SQL JOINs are like 
> any part of a language or toolkit. They're good tools for solving 
> certain classes of problems. They can also be misapplied to problems 
> that they're not so good at. Sometimes they're a performance bottleneck, 
> even when solving the problems for which they're best. Sometimes the 
> best way to solve a performance bottleneck is to redesign your 
> app/system so you don't need to solve that kind of problem anymore 
> (hence the join-less databases). Other times, the cure is worse than the 
> disease and you're better off throwing hardware at the problem.

Look, I completely agree with what you're saying, but: that doesn't 
change the possibility that joins may be expensive in comparison to 
other SQL operations. This is the phrase I should have used perhaps; 
'expensive in comparison with other SQL operations' instead of 'bad'.

Example from my app, where I behaved "by the book" (I hope) and 
normalized my data:

$ time echo "\c hrs;
SELECT hosts.ip, reservation.start_date, architecture.architecture, 
os_kind.os_kind, os_rel.os_rel, os_version.os_version, project.project, 
email.email FROM hosts
  INNER JOIN project ON project.id = hosts.project_id
  INNER JOIN architecture ON hosts.architecture_id = architecture.id
  INNER JOIN os_kind ON os_kind.id = hosts.os_kind_id
  INNER JOIN os_rel ON hosts.os_rel_id = os_rel.id
  INNER JOIN os_version ON hosts.os_version_id = os_version.id
  INNER JOIN reservation_hosts ON hosts.id = reservation_hosts.host_id
  INNER JOIN reservation on reservation.id = 
reservation_hosts.reservation_id
  INNER JOIN email ON reservation.email_id = email.id

;" | psql > /dev/null

real    0m0.099s
user    0m0.015s
sys     0m0.005s



$ time echo "\c hrs;
 > SELECT hosts.ip FROM hosts;
 > SELECT reservation.start_date FROM reservation;
 > SELECT architecture.architecture FROM architecture;
 > SELECT os_rel.os_rel FROM os_rel;
 > SELECT os_version.os_version FROM os_version;
 > SELECT project.project FROM project;
 > SELECT email.email FROM email;
 > " | psql > /dev/null

real    0m0.046s
user    0m0.008s
sys     0m0.004s

Note: I've created indexes on those tables, both on data columns like 
hosts.ip and on .id columns.

So yes, joins apparently are at least twice as expensive as simple 
selects without joins, on a small dataset. Not a drastic increase in 
cost, but smth definitely shows.

It would be interesting to see what happens when row numbers increase to 
large numbers, but I have no such data.

Regards,
mk




From arnodel at googlemail.com  Wed Mar  3 15:58:39 2010
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Wed, 03 Mar 2010 20:58:39 +0000
Subject: Sort Big File Help
References: <374400.23537.qm@web33805.mail.mud.yahoo.com>
	<hmm98g$sdk$1@dough.gmane.org>
	<mailman.234.1267646366.23598.python-list@python.org>
Message-ID: <m2eik115s0.fsf@googlemail.com>

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

> mk wrote:
>> John Filben wrote:
>>> I am new to Python but have used many other (mostly dead) languages
>>> in the past.  I want to be able to process *.txt and *.csv files.
>>> I can now read that and then change them as needed ? mostly just
>>> take a column and do some if-then to create a new variable.  My
>>> problem is sorting these files:
>>>
>>> 1.)    How do I sort file1.txt by position and write out
>>> file1_sorted.txt; for example, if all the records are 100 bytes
>>> long and there is a three digit id in the position 0-2; here would
>>> be some sample data:
>>>
>>> a.       001JohnFilben??
>>>
>>> b.      002Joe  Smith?..
>>
>> Use a dictionary:
>>
>> linedict = {}
>> for line in f:
>>     key = line[:3]
>>     linedict[key] = line[3:] # or alternatively 'line' if you want
>> to include key in the line anyway
>>
>> sortedlines = []
>> for key in linedict.keys().sort():
>>     sortedlines.append(linedict[key])
>>
>> (untested)
>>
>> This is the simplest, and probably inefficient approach. But it
>> should work.
>>
> [snip]
> Simpler would be:
>
>     lines = f.readlines()
>     lines.sort(key=lambda line: line[ : 3])
>
> or even:
>
>     lines = sorted(f.readlines(), key=lambda line: line[ : 3]))

Or even:

    lines = sorted(f)

-- 
Arnaud


From tjreedy at udel.edu  Wed Mar  3 16:00:11 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 03 Mar 2010 16:00:11 -0500
Subject: Working group for Python CPAN-equivalence?
In-Reply-To: <4b8e929d$0$1585$742ec2ed@news.sonic.net>
References: <mailman.179.1267620332.23598.python-list@python.org>	<87r5o1v8vp.fsf@benfinney.id.au>
	<4b8e929d$0$1585$742ec2ed@news.sonic.net>
Message-ID: <hmmiks$1ru$1@dough.gmane.org>

On 3/3/2010 12:05 PM, John Nagle wrote:

>> We have an equivalent in PyPI, though it's incomplete since many
>> *registered* packages are not actually hosted *at* PyPI.
>
> CPAN is a repository. PyPi is an collection of links.

As Ben said, PyPI currently is also a respository and not just links to 
other repositories.

> CPAN has over 260 mirrors. PyPi has none.

A mirroring system has been or is being set up with at least a couple of 
mirrors for things that are hosted at PyPI.

> CPAN enforces standard organization on packages. PyPi does not.
>
> CPAN has quality control, with testers and a test reporting system.
> PyPi does not.

People who are familiar with and like CPAN are free to help improve 
PyPI. Those of us not familiar with it may not know what we are missing, 
or have little idea about what works with CPAN.

Terry Jan Reedy



From malaclypse2 at gmail.com  Wed Mar  3 16:02:02 2010
From: malaclypse2 at gmail.com (Jerry Hill)
Date: Wed, 3 Mar 2010 16:02:02 -0500
Subject: A "scopeguard" for Python
In-Reply-To: <hmmdgd$17s$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<hmm0rd$a48$1@news.eternal-september.org>
	<mailman.211.1267636174.23598.python-list@python.org>
	<hmm5ln$arg$1@news.eternal-september.org>
	<mailman.221.1267642316.23598.python-list@python.org>
	<hmmdgd$17s$1@news.eternal-september.org>
Message-ID: <16651e81003031302s6aac798al2864c8b742d577c3@mail.gmail.com>

On Wed, Mar 3, 2010 at 2:32 PM, Alf P. Steinbach <alfps at start.no> wrote:
> I'm not sure what that shows, except that you haven't grokked this yet.

Maybe you could give us an example of how your code should be used,
and how it differs from the other examples people have given?  And
maybe a quick example of why you would not want to clean up after a
failed operation?

I've been trying to follow along, and I don't get it either.  I guess
that makes me at least the third person that doesn't understand what
you're trying to get across.

-- 
Jerry


From robert.kern at gmail.com  Wed Mar  3 16:02:31 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 03 Mar 2010 15:02:31 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <hmmdgd$17s$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>
	<hmmdgd$17s$1@news.eternal-september.org>
Message-ID: <hmmip9$2fc$1@dough.gmane.org>

On 2010-03-03 13:32 PM, Alf P. Steinbach wrote:
> * Robert Kern:
>> On 2010-03-03 11:18 AM, Alf P. Steinbach wrote:
>>> * Robert Kern:
>>>> On 2010-03-03 09:56 AM, Alf P. Steinbach wrote:
>>>>> * Mike Kent:
>>>>>> What's the compelling use case for this vs. a simple try/finally?
>>>>>
>>>>> if you thought about it you would mean a simple "try/else".
>>>>> "finally" is
>>>>> always executed. which is incorrect for cleanup
>>>>
>>>> Eh? Failed execution doesn't require cleanup? The example you gave is
>>>> definitely equivalent to the try: finally: that Mike posted.
>>>
>>> Sorry, that's incorrect: it's not.
>>>
>>> With correct code (mine) cleanup for action A is only performed when
>>> action A succeeds.
>>>
>>> With incorrect code cleanup for action A is performed when A fails.
>>
>> Oh?
>>
>> $ cat cleanup.py
>>
>> class Cleanup:
>> def __init__( self ):
>> self._actions = []
>>
>> def call( self, action ):
>> assert( callable( action ) )
>> self._actions.append( action )
>>
>> def __enter__( self ):
>> return self
>>
>> def __exit__( self, x_type, x_value, x_traceback ):
>> while( len( self._actions ) != 0 ):
>> try:
>> self._actions.pop()()
>> except BaseException as x:
>> raise AssertionError( "Cleanup: exception during cleanup" )
>>
>> def print_(x):
>> print x
>>
>> with Cleanup() as at_cleanup:
>> at_cleanup.call(lambda: print_("Cleanup executed without an exception."))
>>
>> with Cleanup() as at_cleanup:
>
> *Here* is where you should
>
> 1) Perform the action for which cleanup is needed.
>
> 2) Let it fail by raising an exception.
>
>
>> at_cleanup.call(lambda: print_("Cleanup execute with an exception."))
>> raise RuntimeError()
>
> With an exception raised here cleanup should of course be performed.
>
> And just in case you didn't notice: the above is not a test of the
> example I gave.
>
>
>> $ python cleanup.py
>> Cleanup executed without an exception.
>> Cleanup execute with an exception.
>> Traceback (most recent call last):
>> File "cleanup.py", line 28, in <module>
>> raise RuntimeError()
>> RuntimeError
>>
>>>> The actions are always executed in your example,
>>>
>>> Sorry, that's incorrect.
>>
>> Looks like it to me.
>
> I'm sorry, but you're
>
> 1) not testing my example which you're claiming that you're testing, and

Then I would appreciate your writing a complete, runnable example that 
demonstrates the feature you are claiming. Because it's apparently not 
"ensur[ing] some desired cleanup at the end of a scope, even when the scope is 
exited via an exception" that you talked about in your original post.

Your sketch of an example looks like mine:

   with Cleanup as at_cleanup:
       # blah blah
       chdir( somewhere )
       at_cleanup.call( lambda: chdir( original_dir ) )
       # blah blah

The cleanup function gets registered immediately after the first chdir() and 
before the second "blah blah". Even if an exception is raised in the second 
"blah blah", then the cleanup function will still run. This would be equivalent 
to a try: finally:

# blah blah #1
chdir( somewhere )
try:
     # blah blah #2
finally:
     chdir( original_dir )

and not a try: else:

# blah blah #1
chdir( somewhere )
try:
     # blah blah #2
else:
     chdir( original_dir )

Now, I assumed that the behavior with respect to exceptions occurring in the 
first "blah blah" weren't what you were talking about because until the chdir(), 
there is nothing to clean up.

There is no way that the example you gave translates to a try: else: as you 
claimed in your response to Mike Kent.

> 2) not even showing anything about your earlier statements, which were
> just incorrect.
>
> You're instead showing that my code works as it should for the case that
> you're testing, which is a bit unnecessary since I knew that, but thanks
> anyway.

It's the case you seem to be talking about in your original post. You seem to 
have changed your mind about what you want to talk about. That's fine. We don't 
have to stick with the original topic, but I do ask you to acknowledge that you 
originally were talking about a feature that "ensure[s] some desired cleanup at 
the end of a scope, even when the scope is exited via an exception."

Do you acknowledge this?

> I'm not sure what that shows, except that you haven't grokked this yet.
>
>
>>>> From your post, the scope guard technique is used "to ensure some
>>>> desired cleanup at the end of a scope, even when the scope is exited
>>>> via an exception." This is precisely what the try: finally: syntax is
>>>> for.
>>>
>>> You'd have to nest it. That's ugly. And more importantly, now two people
>>> in this thread (namely you and Mike) have demonstrated that they do not
>>> grok the try functionality and manage to write incorrect code, even
>>> arguing that it's correct when informed that it's not, so it's a pretty
>>> fragile construct, like goto.
>>
>> Uh-huh.
>
> Yeah. Consider that you're now for the third time failing to grasp the
> concept of cleanup for a successful operation.

Oh, I do. But if I didn't want it to run on an exception, I'd just write the 
code without any try:s or with:s at all.

# blah blah #1
chdir( somewhere )
# blah blah #2
chdir( original_dir )

>>>> The with statement allows you to encapsulate repetitive boilerplate
>>>> into context managers, but a general purpose context manager like your
>>>> Cleanup class doesn't take advantage of this.
>>>
>>> I'm sorry but that's pretty meaningless. It's like: "A house allows you
>>> to encapsulate a lot of stinking garbage, but your house doesn't take
>>> advantage of that, it's disgustingly clean". Hello.
>>
>> No, I'm saying that your Cleanup class is about as ugly as the try:
>> finally:. It just shifts the ugliness around. There is a way to use
>> the with statement to make things look better and more readable in
>> certain situations, namely where there is some boilerplate that you
>> would otherwise repeat in many places using try: finally:. You can
>> encapsulate that repetitive code into a class or a @contextmanager
>> generator and just call the contextmanager. A generic context manager
>> where you register callables doesn't replace any boilerplate. You
>> still repeat all of the cleanup code everywhere. What's more, because
>> you have to shove everything into a callable, you have significantly
>> less flexibility than the try: finally:.
>
> Sorry, but that's meaningless again. You're repeating that my house has
> no garbage in it.

No, I'm repeatedly saying that I think your solution stinks. I think it's ugly. 
I think it's restrictive. I think it does not improve on the available solutions.

> And you complain that it would be work to add garbage
> to it. Why do you want that garbage? I think it's nice without it!

And you are entitled to that opinion. I am giving you mine.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From mrkafk at gmail.com  Wed Mar  3 16:11:40 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 22:11:40 +0100
Subject: Generic singleton
In-Reply-To: <m2iq9d197a.fsf@googlemail.com>
References: <mailman.222.1267642515.23598.python-list@python.org>
	<m2iq9d197a.fsf@googlemail.com>
Message-ID: <hmmjad$4gm$1@dough.gmane.org>

Arnaud Delobelle wrote:
> mk <mrkafk at gmail.com> writes:
> [...]
>> hashable
>> ..
>>     All of Python?s immutable built-in objects are hashable, while no
>> mutable containers (such as lists or dictionaries) are.
>>
>> Well ok, hashable they're not; but apparently at least dict and list
>> have id()?
> 
> lists and dicts are not hashable, but their types are:

Oh.

>>>> hash(dict)
> 4296155808
>>>> hash(list)
> 4296151808
> 
> So just use the type as the key to the dictionary you maintain in your
> singleton.  

Hmm I have tested it and it seems to work.

> But the question is what you use your singleton for.

Well, partly this was for sake of learning; but partially I was thinking 
whether singleton as such may be useful for implementing "global queue 
of tasks" for worker threads in a large program: instead of handing down 
over and over the same reference to the global queue of tasks, classes 
or functions could call Singleton() and be done with it.

Or I could make my life simpler and use global variable. :-)

I will soon need to write such program, with remote calls from pyro 
(most probably), many worker threads, short-running jobs and 
long-running jobs, etc.


Regards,
mk



From wanderer at dialup4less.com  Wed Mar  3 16:15:07 2010
From: wanderer at dialup4less.com (Wanderer)
Date: Wed, 3 Mar 2010 13:15:07 -0800 (PST)
Subject: Pylint Argument number differs from overridden method
References: <2484ca6e-0eb9-4e0c-a7db-d035badab711@t20g2000yqe.googlegroups.com>
	<mailman.226.1267644846.23598.python-list@python.org>
Message-ID: <9ca2e014-f238-4b55-8ace-f884b2112a19@z11g2000yqz.googlegroups.com>

On Mar 3, 2:33?pm, Robert Kern <robert.k... at gmail.com> wrote:
> On 2010-03-03 11:39 AM, Wanderer wrote:
>
> > Pylint W0221 gives the warning
> > Argument number differs from overridden method.
>
> > Why is this a problem? I'm overriding the method to add additional
> > functionality.
>
> There are exceptions to every guideline. Doing this could easily be a mistake,
> so it's one of the many things that Pylint checks for. Silence the warning if
> you like.
>
> --
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless enigma
> ? that is made terrible by our own mad attempt to interpret it as though it had
> ? an underlying truth."
> ? ?-- Umberto Eco

Thanks I was just wondering if I was overlooking something about
inheritance.


From tjreedy at udel.edu  Wed Mar  3 16:17:11 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 03 Mar 2010 16:17:11 -0500
Subject: Pylint Argument number differs from overridden method
In-Reply-To: <2484ca6e-0eb9-4e0c-a7db-d035badab711@t20g2000yqe.googlegroups.com>
References: <2484ca6e-0eb9-4e0c-a7db-d035badab711@t20g2000yqe.googlegroups.com>
Message-ID: <hmmjkn$5og$1@dough.gmane.org>

On 3/3/2010 12:39 PM, Wanderer wrote:
> Pylint W0221 gives the warning
> Argument number differs from overridden method.
>
> Why is this a problem?

It *could* indicate a mistake. Lint programs, by definition, are 
nitpicky, and flag things that are possible problems even though 
syntactically correct.


I'm overriding the method to add additional
> functionality.
>
> This
>      def GetRays(self, angle, pt, lmbda = 0.6):
>          """
>          """
>
>          angle, x, y, Rays, Power = self.ARefract(angle, pt[0], pt[1],
> lmbda)
>          pt1 = (x, y)
>
>          return Rays, Power, angle, pt1
>
>
>      def ARefract(self, angle, x, y, lmbda = 0.6):
>          """
>          """
>
>          Nt = self.Mat.NtGet(lmbda)
>          self.NtSet(Nt)
>          angle, x, y, Rays, Power = self.Refract(angle, x, y)
>
>          return angle, x, y, Rays, Power
>
>
>
> Over rides this
>
>      def GetRays(self, angle, pt):
>          """
>          """
>
>          angle, x, y, Rays, Power = self.Refract(angle, pt[0], pt[1])
>          pt1 = (x, y)
>
>          return Rays, Power, angle, pt1
>
>
> Thanks




From mrkafk at gmail.com  Wed Mar  3 16:19:04 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 22:19:04 +0100
Subject: Docstrings considered too complicated
In-Reply-To: <hmmdrf$fco$1@dough.gmane.org>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>	<4B8B9845.70604@sequans.com>	<mailman.59.1267456634.23598.python-list@python.org>	<7v695nFa0fU1@mid.individual.net>	<4B8E7538.2080003@mrabarnett.plus.com>	<20100303111248.7f40d659.darcy@druid.net>	<hmm7l9$m4f$1@dough.gmane.org>
	<hmmdrf$fco$1@dough.gmane.org>
Message-ID: <hmmjo9$634$1@dough.gmane.org>

Steve Holden wrote:

> Puts me in mind of Mario Wolczko's early attempts to implement SmallTalk
> on a VAX 11/750. The only bitmapped display we had available was a Three
> Rivers PERQ, connected by a 9600bps serial line. We left it running at
> seven o'clock one evening, and by nine am the next day it had brought up
> about two thirds of the initial VM loader screen ...
> 
> You tell these young kids, and they just don't believe you!

For the uncouth yobs, err, culturally-challenged:

http://www.youtube.com/watch?v=Xe1a1wHxTyo

(Four Yorkshiremen)

Regards,
mk



From nad at acm.org  Wed Mar  3 16:22:59 2010
From: nad at acm.org (Ned Deily)
Date: Wed, 03 Mar 2010 13:22:59 -0800
Subject: Installing Scrapy on Mac OS X 10.6
References: <9b08574f-0410-45bc-89af-0d3cf7d21819@e7g2000yqf.googlegroups.com>
Message-ID: <nad-BC3969.13225903032010@dough.gmane.org>

In article 
<9b08574f-0410-45bc-89af-0d3cf7d21819 at e7g2000yqf.googlegroups.com>,
 Sky Larking <skylarking11 at gmail.com> wrote:
> Has anyone successfully installed Scrapy ( http://scrapy.org ) on a
> Mac OS X machine running 10.6.x? The Documentaion says
> Mac OS X ships an libxml2 version too old to be used by Scrapy...But
> doesn't say which version of OS X.. I am wondering if the version of
> libxml2 is also not compatible..

A similar question came up on Stack Overflow recently:

http://stackoverflow.com/questions/2353957/do-i-need-32bit-libxml2-for-py
thon-on-snow-leopard/

-- 
 Ned Deily,
 nad at acm.org



From darcy at druid.net  Wed Mar  3 16:23:14 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Wed, 3 Mar 2010 16:23:14 -0500
Subject: taking python enterprise level?...
In-Reply-To: <hmmdtn$fkn$1@dough.gmane.org>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>
	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>
	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>
	<20100302015813.5397655e.darcy@druid.net>
	<hmm2jc$28u$1@dough.gmane.org> <1267638602.988.19.camel@localhost>
	<hmmdtn$fkn$1@dough.gmane.org>
Message-ID: <20100303162314.a46484cf.darcy@druid.net>

On Wed, 03 Mar 2010 20:39:35 +0100
mk <mrkafk at gmail.com> wrote:
> > If you denormalise the table, and update the first index to be on
> > (client_id, project_id, date) it can end up running far more quickly -

Maybe.  Don't start with denormalization.  Write it properly and only
consider changing if profiling suggests that that is your bottleneck.
With a decent database engine and proper design it will hardly ever be.

>  From what you write further in the mail I conclude that you have not 
> eliminated the first table, just made table projects look like I wrote 
> above, right? (and used stored procedures to make sure that both tables 
> contain the relevant data for client_id and project_id columns in both 
> tables)

Note that rather than speeding things up this could actually slow
things down depending on your usage.  If you do lots of updates and you
have to write extra information every time then that's worse than a few
extra reads, especially since read data can be cached but written data
must be pushed to disk immediately in an ACID database.

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


From darcy at druid.net  Wed Mar  3 16:29:29 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Wed, 3 Mar 2010 16:29:29 -0500
Subject: Old farts playing with their toys (was: Docstrings...)
In-Reply-To: <4B8EABCB.6050303@mrabarnett.plus.com>
References: <20100224212303.242222c6@geekmail.INVALID>
	<eq4l57-okf2.ln1@ozzie.tundraware.com>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <7uu1ooFiipU1@mid.individual.net>
	<4B89D8BE.2040905@mrabarnett.plus.com> <4B8B9845.70604@sequans.com>
	<mailman.59.1267456634.23598.python-list@python.org>
	<7v695nFa0fU1@mid.individual.net>
	<4B8E7538.2080003@mrabarnett.plus.com>
	<20100303111248.7f40d659.darcy@druid.net>
	<4B8EABCB.6050303@mrabarnett.plus.com>
Message-ID: <20100303162929.560a17d3.darcy@druid.net>

On Wed, 03 Mar 2010 18:34:51 +0000
MRAB <python at mrabarnett.plus.com> wrote:
> But I was still able to play Nim and Duck Shoot (after keying it in)!

Did you ever play Star Trek with sound effects?  I was never able to
get it to work but supposedly if you put an AM radio tuned to a
specific frequency near the side with the I/O card it would generate
static that was supposed to be the sound of explosions.

Of course, the explosions were happening in a vaccum so maybe the
silence was accurate.  :-)

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


From bdesth.quelquechose at free.quelquepart.fr  Wed Mar  3 16:34:46 2010
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Wed, 03 Mar 2010 22:34:46 +0100
Subject: Generic singleton
In-Reply-To: <mailman.222.1267642515.23598.python-list@python.org>
References: <mailman.222.1267642515.23598.python-list@python.org>
Message-ID: <4b8ee36f$0$22040$426a74cc@news.free.fr>

mk a ?crit :
> 
> does every builtin class have unique id?

Classes are objects. And every object *within a python process* has it's
own unique id. For a definition of "unique" being "unique amongst the
objects living in the process at a given time" - IOW, if an object is
garbage-collected, it's id can (and will) be reused. For the record, in
CPython, the id value is the address of the (virtual) memory location
where the object lives (not that you could do anything of this info from
within Python - no pointers here).






From alfps at start.no  Wed Mar  3 16:35:09 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 03 Mar 2010 22:35:09 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.241.1267650180.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>
	<mailman.241.1267650180.23598.python-list@python.org>
Message-ID: <hmmkmh$mt1$1@news.eternal-september.org>

* Robert Kern:
> On 2010-03-03 13:32 PM, Alf P. Steinbach wrote:
>> * Robert Kern:
>>> On 2010-03-03 11:18 AM, Alf P. Steinbach wrote:
>>>> * Robert Kern:
>>>>> On 2010-03-03 09:56 AM, Alf P. Steinbach wrote:
>>>>>> * Mike Kent:
>>>>>>> What's the compelling use case for this vs. a simple try/finally?
>>>>>>
>>>>>> if you thought about it you would mean a simple "try/else".
>>>>>> "finally" is
>>>>>> always executed. which is incorrect for cleanup
>>>>>
>>>>> Eh? Failed execution doesn't require cleanup? The example you gave is
>>>>> definitely equivalent to the try: finally: that Mike posted.
>>>>
>>>> Sorry, that's incorrect: it's not.
>>>>
>>>> With correct code (mine) cleanup for action A is only performed when
>>>> action A succeeds.
>>>>
>>>> With incorrect code cleanup for action A is performed when A fails.
>>>
>>> Oh?
>>>
>>> $ cat cleanup.py
>>>
>>> class Cleanup:
>>> def __init__( self ):
>>> self._actions = []
>>>
>>> def call( self, action ):
>>> assert( callable( action ) )
>>> self._actions.append( action )
>>>
>>> def __enter__( self ):
>>> return self
>>>
>>> def __exit__( self, x_type, x_value, x_traceback ):
>>> while( len( self._actions ) != 0 ):
>>> try:
>>> self._actions.pop()()
>>> except BaseException as x:
>>> raise AssertionError( "Cleanup: exception during cleanup" )
>>>
>>> def print_(x):
>>> print x
>>>
>>> with Cleanup() as at_cleanup:
>>> at_cleanup.call(lambda: print_("Cleanup executed without an 
>>> exception."))
>>>
>>> with Cleanup() as at_cleanup:
>>
>> *Here* is where you should
>>
>> 1) Perform the action for which cleanup is needed.
>>
>> 2) Let it fail by raising an exception.
>>
>>
>>> at_cleanup.call(lambda: print_("Cleanup execute with an exception."))
>>> raise RuntimeError()
>>
>> With an exception raised here cleanup should of course be performed.
>>
>> And just in case you didn't notice: the above is not a test of the
>> example I gave.
>>
>>
>>> $ python cleanup.py
>>> Cleanup executed without an exception.
>>> Cleanup execute with an exception.
>>> Traceback (most recent call last):
>>> File "cleanup.py", line 28, in <module>
>>> raise RuntimeError()
>>> RuntimeError
>>>
>>>>> The actions are always executed in your example,
>>>>
>>>> Sorry, that's incorrect.
>>>
>>> Looks like it to me.
>>
>> I'm sorry, but you're
>>
>> 1) not testing my example which you're claiming that you're testing, and
> 
> Then I would appreciate your writing a complete, runnable example that 
> demonstrates the feature you are claiming. Because it's apparently not 
> "ensur[ing] some desired cleanup at the end of a scope, even when the 
> scope is exited via an exception" that you talked about in your original 
> post.
> 
> Your sketch of an example looks like mine:
> 
>   with Cleanup as at_cleanup:
>       # blah blah
>       chdir( somewhere )
>       at_cleanup.call( lambda: chdir( original_dir ) )
>       # blah blah
> 
> The cleanup function gets registered immediately after the first chdir() 
> and before the second "blah blah". Even if an exception is raised in the 
> second "blah blah", then the cleanup function will still run. This would 
> be equivalent to a try: finally:
> 
> # blah blah #1
> chdir( somewhere )
> try:
>     # blah blah #2
> finally:
>     chdir( original_dir )

Yes, this is equivalent code.

The try-finally that you earlier claimed was equivalent, was not.



> and not a try: else:
> 
> # blah blah #1
> chdir( somewhere )
> try:
>     # blah blah #2
> else:
>     chdir( original_dir )

This example is however meaningless except as misdirection. There are infinitely 
many constructs that include try-finally and try-else, that the with-Cleanup 
code is not equivalent to. It's dumb to show one such.

Exactly what are you trying to prove here?

Your earlier claims are still incorrect.


> Now, I assumed that the behavior with respect to exceptions occurring in 
> the first "blah blah" weren't what you were talking about because until 
> the chdir(), there is nothing to clean up.
> 
> There is no way that the example you gave translates to a try: else: as 
> you claimed in your response to Mike Kent.

Of course there is.

Note that Mike wrapped the action A within the 'try':


<code author="Mike" correct="False">
    original_dir = os.getcwd()
    try:
        os.chdir(somewhere)
        # Do other stuff
    finally:
        os.chdir(original_dir)
        # Do other cleanup
</code>


The 'finally' he used, shown above, yields incorrect behavior.

Namely cleanup always, while 'else', in that code, can yield correct behavior 
/provided/ that it's coded correctly:


<code author="Alf" correct="ProbablyTrue" disclaimer="off the cuff">
    original_dir = os.getcwd()
    try:
        os.chdir(somewhere)
    except Whatever:
        # whatever, e.g. logging
        raise
    else:
        try:
            # Do other stuff
        finally:
            os.chdir(original_dir)
            # Do other cleanup
</code>


>> 2) not even showing anything about your earlier statements, which were
>> just incorrect.
>>
>> You're instead showing that my code works as it should for the case that
>> you're testing, which is a bit unnecessary since I knew that, but thanks
>> anyway.
> 
> It's the case you seem to be talking about in your original post.

What's this "seems"? Are you unable to read that very short post?


> You 
> seem to have changed your mind about what you want to talk about. That's 
> fine.

And what's this claim about me changing any topic?


> We don't have to stick with the original topic

Why not stick with the original topic?


>, but I do ask you 
> to acknowledge that you originally were talking about a feature that 
> "ensure[s] some desired cleanup at the end of a scope, even when the 
> scope is exited via an exception."

Yes, that's what it does.

Which is I why I wrote that.

This should not be hard to grok.


> Do you acknowledge this?

This seems like pure noise, to cover up that you were sputing a lot of incorrect 
statements earlier.


>> I'm not sure what that shows, except that you haven't grokked this yet.
>>
>>
>>>>> From your post, the scope guard technique is used "to ensure some
>>>>> desired cleanup at the end of a scope, even when the scope is exited
>>>>> via an exception." This is precisely what the try: finally: syntax is
>>>>> for.
>>>>
>>>> You'd have to nest it. That's ugly. And more importantly, now two 
>>>> people
>>>> in this thread (namely you and Mike) have demonstrated that they do not
>>>> grok the try functionality and manage to write incorrect code, even
>>>> arguing that it's correct when informed that it's not, so it's a pretty
>>>> fragile construct, like goto.
>>>
>>> Uh-huh.
>>
>> Yeah. Consider that you're now for the third time failing to grasp the
>> concept of cleanup for a successful operation.
> 
> Oh, I do. But if I didn't want it to run on an exception, I'd just write 
> the code without any try:s or with:s at all.
> 
> # blah blah #1
> chdir( somewhere )
> # blah blah #2
> chdir( original_dir )

Yes, but what's that got to do with anything?


>>>>> The with statement allows you to encapsulate repetitive boilerplate
>>>>> into context managers, but a general purpose context manager like your
>>>>> Cleanup class doesn't take advantage of this.
>>>>
>>>> I'm sorry but that's pretty meaningless. It's like: "A house allows you
>>>> to encapsulate a lot of stinking garbage, but your house doesn't take
>>>> advantage of that, it's disgustingly clean". Hello.
>>>
>>> No, I'm saying that your Cleanup class is about as ugly as the try:
>>> finally:. It just shifts the ugliness around. There is a way to use
>>> the with statement to make things look better and more readable in
>>> certain situations, namely where there is some boilerplate that you
>>> would otherwise repeat in many places using try: finally:. You can
>>> encapsulate that repetitive code into a class or a @contextmanager
>>> generator and just call the contextmanager. A generic context manager
>>> where you register callables doesn't replace any boilerplate. You
>>> still repeat all of the cleanup code everywhere. What's more, because
>>> you have to shove everything into a callable, you have significantly
>>> less flexibility than the try: finally:.
>>
>> Sorry, but that's meaningless again. You're repeating that my house has
>> no garbage in it.
> 
> No, I'm repeatedly saying that I think your solution stinks. I think 
> it's ugly. I think it's restrictive. I think it does not improve on the 
> available solutions.

First you'd have to understand it, simple as it is.


>> And you complain that it would be work to add garbage
>> to it. Why do you want that garbage? I think it's nice without it!
> 
> And you are entitled to that opinion. I am giving you mine.

Well, I'm sorry, but while you are entitled to an opinion it's not an opinion 
that carries any weight: first you need to get your facts and claims straight.

So far only this latest posting of yours has been free of directly incorrect 
statements.

But you still have a lot of statements that just show total incomprehension, 
like your example of achieving no cleanup in the case of an exception.


Cheers & hth.,

- Alf


From darcy at druid.net  Wed Mar  3 16:37:16 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Wed, 3 Mar 2010 16:37:16 -0500
Subject: DOS Follies (Was: Docstrings...)
In-Reply-To: <hmme68$glb$1@dough.gmane.org>
References: <20100303114603.7021e9ba.darcy@druid.net>
	<539252.91463.qm@web58904.mail.re1.yahoo.com>
	<hmme68$glb$1@dough.gmane.org>
Message-ID: <20100303163716.d54a6e5d.darcy@druid.net>

On Wed, 03 Mar 2010 20:44:08 +0100
mk <mrkafk at gmail.com> wrote:
> It reminds me of why Windows uses backslashes for path separation 
> instead of slashes: what I've *heard*, and do not know if it's true, 
> it's because Gates fancied using / for options switch instead of -, and 
> to hell with established practice.

That was because CP/M used slashes for options and DOS copied that.  By
the time hierarchy was added it was too late to change.

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


From e_d_k at yahoo.com  Wed Mar  3 16:43:13 2010
From: e_d_k at yahoo.com (Ed Keith)
Date: Wed, 3 Mar 2010 13:43:13 -0800 (PST)
Subject: Docstrings considered too complicated
In-Reply-To: <4eb0089f1003031154j78cc7d22kf18ae339fe8c686@mail.gmail.com>
Message-ID: <720139.74191.qm@web58902.mail.re1.yahoo.com>

--- On Wed, 3/3/10, David Robinow <drobinow at gmail.com> wrote:

> From: David Robinow <drobinow at gmail.com>
> Subject: Re: Docstrings considered too complicated
> To: python-list at python.org
> Date: Wednesday, March 3, 2010, 2:54 PM
> On Wed, Mar 3, 2010 at 1:01 PM, Ed
> Keith <e_d_k at yahoo.com>
> wrote:
> > --- On Wed, 3/3/10, D'Arcy J.M. Cain ?wrote:
> >
> >> They needed a way to tell where the end of the
> information
> >> was.? Why
> >> they used ^Z (SUB - Substitute) instead of ^C (ETX
> - End of
> >> TeXt) or
> >> even ^D (EOT - End Of Transmission) is anyone's
> guess.
> >
> > That has always puzzled me to. ETX and EOT were well
> established, why no use one of them? I'd love to know what
> they were thinking.
> 
> There were numerous incompatible and primitive transfer
> protocols in
> those days. They probably wanted to pick something that was
> NOT well
> established so it would pass through without, for example,
> causing End
> Of Transmission.

That makes a lot of sense.

   -EdK

Ed Keith
e_d_k at yahoo.com

Blog: edkeith.blogspot.com



      


From python at mrabarnett.plus.com  Wed Mar  3 16:45:46 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 03 Mar 2010 21:45:46 +0000
Subject: Old farts playing with their toys
In-Reply-To: <20100303162929.560a17d3.darcy@druid.net>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>	<4B8B9845.70604@sequans.com>	<mailman.59.1267456634.23598.python-list@python.org>	<7v695nFa0fU1@mid.individual.net>	<4B8E7538.2080003@mrabarnett.plus.com>	<20100303111248.7f40d659.darcy@druid.net>	<4B8EABCB.6050303@mrabarnett.plus.com>
	<20100303162929.560a17d3.darcy@druid.net>
Message-ID: <4B8ED88A.60502@mrabarnett.plus.com>

D'Arcy J.M. Cain wrote:
> On Wed, 03 Mar 2010 18:34:51 +0000
> MRAB <python at mrabarnett.plus.com> wrote:
>> But I was still able to play Nim and Duck Shoot (after keying it in)!
> 
> Did you ever play Star Trek with sound effects?  I was never able to
> get it to work but supposedly if you put an AM radio tuned to a
> specific frequency near the side with the I/O card it would generate
> static that was supposed to be the sound of explosions.
> 
> Of course, the explosions were happening in a vaccum so maybe the
> silence was accurate.  :-)
> 
A computer with sound? Heresy! :-)

There was some hardware that could be added to provide some sort of
video output, IIRC.

<checks wikipedia>

Aha, here it is:
http://en.wikipedia.org/wiki/MK14

and also here:

http://www.nvg.ntnu.no/sinclair/computers/mk14/mk14_photos.htm

The top-left picture looks like it has all its chips, so is the
fully-expanded version.

Oh, I forgot about the red reset button!


From bdesth.quelquechose at free.quelquepart.fr  Wed Mar  3 16:46:08 2010
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Wed, 03 Mar 2010 22:46:08 +0100
Subject: memory usage, temporary and otherwise
In-Reply-To: <mailman.220.1267642060.23598.python-list@python.org>
References: <mailman.220.1267642060.23598.python-list@python.org>
Message-ID: <4b8ee61a$0$26644$426a74cc@news.free.fr>

mk a ?crit :
> 
> Obviously, don't try this on low-memory machine:
> 
>>>> a={}
>>>> for i in range(10000000):

Note that in Python 2, this will build a list of 10000000 int objects.
You may want to use xrange instead...

> ...     a[i]='spam'*10
> ...
>>>> import sys
>>>> sys.getsizeof(a)
> 201326728
>>>> id(a[1])
> 3085643936L
>>>> id(a[100])
> 3085713568L
> 
>>>> ids={}
>>>> for i in range(len(a)):

And this build yet another list of 10000000 int objects.

> ...     ids[id(a[i])]=True
> ...
>>>> len(ids.keys())
> 10000000
> 
> Hm, apparently Python didn't spot that 'spam'*10 in a's values is really
> the same string, right?

Seems not. FWIW, Python does some caching on some values of some
immutable types (small ints, some strings etc), but this is
implementation dependant so you shouldn't rely on it.

> So sys.getsizeof returns some 200MB for this dictionary. But according
> to top RSS of the python process is 300MB. ps auxw says the same thing
> (more or less).
>
> Why the 50% overhead? (and I would swear that a couple of times RSS
> according to top grew to 800MB).

(overly simplified)

When an object is garbage-collected, the memory is not necessarily
"returned" to the system - and the system doesn't necessarily claim it
back neither until it _really_ needs it.

This avoid a _lot_ of possibly useless work for both the python
interpreter (keeping already allocated memory costs less than immediatly
returning it, just to try and allocate some more memory a couple
instructions later) and the system (ditto - FWIW, how linux handles
memory allocations is somewhat funny, if you ever programmed in C).

HTH


From mrkafk at gmail.com  Wed Mar  3 16:46:53 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 22:46:53 +0100
Subject: Sort Big File Help
In-Reply-To: <hmm98g$sdk$1@dough.gmane.org>
References: <374400.23537.qm@web33805.mail.mud.yahoo.com>
	<hmm98g$sdk$1@dough.gmane.org>
Message-ID: <hmmlcf$cdr$1@dough.gmane.org>

John, there's an error in my program, I forgot that list.sort() method 
doesn't return the list (it sorts in place). So it should look like:

#!/usr/bin/python

def sortit(fname):
     fo = open(fname)
     linedict = {}
     for line in fo:
         key = line[:3]
         linedict[key] = line
     sortedlines = []
     keys = linedict.keys()
     keys.sort()
     for key in keys:
         sortedlines.append(linedict[key])
     return sortedlines

if __name__ == '__main__':
     sortit('testfile.txt')


MRAB's solution is obviously better, provided you know about Python's 
lambda.

Regards,
mk



From bdesth.quelquechose at free.quelquepart.fr  Wed Mar  3 16:47:55 2010
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Wed, 03 Mar 2010 22:47:55 +0100
Subject: memory usage, temporary and otherwise
In-Reply-To: <4b8ee61a$0$26644$426a74cc@news.free.fr>
References: <mailman.220.1267642060.23598.python-list@python.org>
	<4b8ee61a$0$26644$426a74cc@news.free.fr>
Message-ID: <4b8ee685$0$26644$426a74cc@news.free.fr>

Bruno Desthuilliers a ?crit :
> mk a ?crit :
(snip)
>> So sys.getsizeof returns some 200MB for this dictionary. But according
>> to top RSS of the python process is 300MB. ps auxw says the same thing
>> (more or less).
>>
>> Why the 50% overhead? 

Oh, and yes - the interpreter itself, the builtins, and all imported
modules also eat some space...

(snip)


From mrkafk at gmail.com  Wed Mar  3 16:52:35 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 03 Mar 2010 22:52:35 +0100
Subject: Sort Big File Help
In-Reply-To: <4B8EBF9A.6080603@mrabarnett.plus.com>
References: <374400.23537.qm@web33805.mail.mud.yahoo.com>	<hmm98g$sdk$1@dough.gmane.org>
	<4B8EBF9A.6080603@mrabarnett.plus.com>
Message-ID: <hmmln3$dnk$1@dough.gmane.org>

MRAB wrote:

> [snip]
> Simpler would be:
> 
>     lines = f.readlines()
>     lines.sort(key=lambda line: line[ : 3])
> 
> or even:
> 
>     lines = sorted(f.readlines(), key=lambda line: line[ : 3]))

Sure, but a complete newbie (I have this impression about OP) doesn't 
have to know about lambda.

I expected my solution to be slower, but it's not (on a file with 
100,000 random string lines):

# time ./sort1.py

real    0m0.386s
user    0m0.372s
sys     0m0.014s

# time ./sort2.py

real    0m0.303s
user    0m0.286s
sys     0m0.017s


sort1.py:

#!/usr/bin/python

def sortit(fname):
     lines = open(fname).readlines()
     lines.sort(key = lambda x: x[:3])

if __name__ == '__main__':
     sortit('testfile.txt')



sort2.py:

#!/usr/bin/python

def sortit(fname):
     fo = open(fname)
     linedict = {}
     for line in fo:
         key = line[:3]
         linedict[key] = line
     sortedlines = []
     keys = linedict.keys()
     keys.sort()
     for key in keys:
         sortedlines.append(linedict[key])
     return sortedlines

if __name__ == '__main__':
     sortit('testfile.txt')


Any idea why? After all, I'm "manually" doing quite a lot: allocating 
key in a dict, then sorting dict's keys, then iterating over keys and 
accessing dict value.

Regards,
mk



From toby at telegraphics.com.au  Wed Mar  3 16:55:58 2010
From: toby at telegraphics.com.au (toby)
Date: Wed, 3 Mar 2010 13:55:58 -0800 (PST)
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
Message-ID: <26bd4a5c-4d66-4597-a0ee-b4990f468e68@g26g2000yqn.googlegroups.com>

On Mar 3, 3:54?pm, ccc31807 <carte... at gmail.com> wrote:
> On Mar 3, 12:36?pm, Xah Lee <xah... at gmail.com> wrote:
>
> > recently i wrote a blog article on The NoSQL Movement
> > athttp://xahlee.org/comp/nosql.html
>
> > i'd like to post it somewhere public to solicit opinions, but in the
> > 20 min or so, i couldn't find a proper newsgroup, nor private list
> > that my somewhat anti-NoSQL Movement article is fitting.
>
> I only read the first two paragraphs of your article, so I can't
> respond to it.
>
> I've halfway followed the NoSQL movement. My day job is a database
> manager and I so SQL databases for a living, as well as Perl. I see a
> lot of abuse of relational databases in the Real World, as well as a
> lot of abuse for non-SQL alternatives, e.g., (mis)using Excel for a
> database. The big, enterprise database we have at work is built on IBM
> UniQuery, which is a non-SQL flat file database product, so I've had a
> lot of experience with big non-SQL database work.
>
> I've also developed a marked preference for plain text databases. For
> a lot of applications they are simpler, easier, and better. I've also
> had some experience with XML databases, and find that they are ideal
> for applications with 'ragged' data.
>
> As with anything else, you need to match the tool to the job. Yes, I
> feel that relational database technology has been much used, and much
> abused. However, one of my favorite applications is Postgres, and I
> think it's absolutely unbeatable

It is beatable outside of its sweetspot, like any system. NoSQL is not
so much about "beating" relational databases, as simply a blanket term
for useful non-relational technologies. There's not much point in
reading Xah beyond the heading of his manifesto, as it is no more
relevant to be "anti-NoSQL" as to be "anti-integers" because they
don't store fractions.

>  where you have to store data and

"relational data"

> perform a large number of queries.

Why does the number matter?

>
> Finally, with regard to Structured Query Language itself, I find that
> it's well suited to its purpose. I hand write a lot of SQL statements
> for various purposes, and while like any language you find it
> exceedingly difficult to express concepts that you can think, it
> mostly allows the expression of most of what you want to say.
>
> CC.



From usenot at geekmail.INVALID  Wed Mar  3 16:58:40 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Wed, 3 Mar 2010 22:58:40 +0100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<eq4l57-okf2.ln1@ozzie.tundraware.com>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <7uu1ooFiipU1@mid.individual.net>
	<4B89D8BE.2040905@mrabarnett.plus.com> <4B8B9845.70604@sequans.com>
	<mailman.59.1267456634.23598.python-list@python.org>
	<7v695nFa0fU1@mid.individual.net>
	<4B8E7538.2080003@mrabarnett.plus.com>
	<20100303111248.7f40d659.darcy@druid.net>
	<hmm7l9$m4f$1@dough.gmane.org> <hmmdrf$fco$1@dough.gmane.org>
	<mailman.244.1267651225.23598.python-list@python.org>
Message-ID: <20100303225840.21bd3108@geekmail.INVALID>

On Wed, 03 Mar 2010 22:19:04 +0100 mk <mrkafk at gmail.com> wrote:

> For the uncouth yobs, err, culturally-challenged:
> 
> http://www.youtube.com/watch?v=Xe1a1wHxTyo
> 
> (Four Yorkshiremen)
> 

http://www.youtube.com/watch?v=-eDaSvRO9xA

That's the definitive version. I mean, if you're going to talk vintage,
talk vintage.

/W


-- 
INVALID? DE!



From vinay_sajip at yahoo.co.uk  Wed Mar  3 16:59:25 2010
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Wed, 3 Mar 2010 13:59:25 -0800 (PST)
Subject: Version 0.3.8 of the Python config module has been released.
Message-ID: <9cc4c234-2c60-4f4e-b059-d8448ea8b8b4@d27g2000yqf.googlegroups.com>

Version 0.3.8 of the Python config module has been released.

What Does It Do?
================
The config module allows you to implement a hierarchical configuration
scheme with support for mappings and sequences, cross-references
between one part of the configuration and another, the ability to
flexibly access real Python objects, facilities for configurations to
include and cross-reference one another, simple expression evaluation
and the ability to change, save, cascade and merge configurations. You
can easily integrate with command line options using optparse.

This module has been developed on python 2.3 but should work on
version 2.2 or greater. A test suite using unittest is included in the
distribution.

A very simple configuration file (simple.cfg):

# starts here
message: Hello, world!
#ends here

a very simple program to use it:

from config import Config

cfg = Config(file('simple.cfg'))
print cfg.message

results in:

Hello, world!

Configuration files are key-value pairs, but the values can be
containers that contain further values.

A simple example - with the example configuration file:

messages:
[
  {
    stream : `sys.stderr`
    message: 'Welcome'
    name: 'Harry'
  }
  {
    stream : `sys.stdout`
    message: 'Welkom'
    name: 'Ruud'
  }
  {
    stream : $messages[0].stream
    message: 'Bienvenue'
    name: Yves
  }
]

a program to read the configuration would be:

from config import Config

f = file('simple.cfg')
cfg = Config(f)
for m in cfg.messages:
    s = '%s, %s' % (m.message, m.name)
    try:
        print >> m.stream, s
    except IOError, e:
        print e

which, when run, would yield the console output:

Welcome, Harry
Welkom, Ruud
Bienvenue, Yves

The above example just scratches the surface. There's more information
about this module available at

http://www.red-dove.com/config-doc/

Comprehensive API documentation is available at

http://www.red-dove.com/config/index.html

As always, your feedback is most welcome (especially bug reports,
patches and suggestions for improvement). Enjoy!

Cheers

Vinay Sajip
Red Dove Consultants Ltd.

Changes since the last release posted on comp.lang.python[.announce]:
=====================================================
Fixed parsing bug which caused failure for negative numbers in
sequences.
Improved resolution logic.


From jgardner at jonathangardner.net  Wed Mar  3 17:16:24 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Wed, 3 Mar 2010 14:16:24 -0800
Subject: Sort Big File Help
In-Reply-To: <374400.23537.qm@web33805.mail.mud.yahoo.com>
References: <374400.23537.qm@web33805.mail.mud.yahoo.com>
Message-ID: <6cc20cea1003031416l2a16a5fdl2199aa379982983e@mail.gmail.com>

On Wed, Mar 3, 2010 at 8:19 AM, John Filben <johnfilben at yahoo.com> wrote:
> I am new to Python but have used many other (mostly dead) languages in the
> past.? I want to be able to process *.txt and *.csv files.? I can now read
> that and then change them as needed ? mostly just take a column and do some
> if-then to create a new variable.? My problem is sorting these files:
>
> 1.)??? How do I sort file1.txt by position and write out file1_sorted.txt;
> for example, if all the records are 100 bytes long and there is a three
> digit id in the position 0-2; here would be some sample data:
>
> a.?????? 001JohnFilben??
>
> b.????? 002Joe? Smith?..
>
> 2.)??? How do I sort file1.csv by column name; for example, if all the
> records have three column headings, ?id?, ?first_name?, ?last_name?; ?here
> would be some sample data:
>
> a.?????? Id, first_name,last_name
>
> b.????? 001,John,Filben
>
> c.?????? 002,Joe, Smith
>
> 3.)??? What about if I have millions of records and I am processing on a
> laptop with a large external drive ? basically, are there space
> considerations? What are the work arounds.
>
> Any help would be appreciated. Thank you.
>

You may also want to look at the GNU tools "sort" and "cut". If your
job is to process files, I'd recommend tools designed to process files
for the task.

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From jgardner at jonathangardner.net  Wed Mar  3 17:17:24 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Wed, 3 Mar 2010 14:17:24 -0800
Subject: Working group for Python CPAN-equivalence?
In-Reply-To: <hmmiks$1ru$1@dough.gmane.org>
References: <mailman.179.1267620332.23598.python-list@python.org>
	<87r5o1v8vp.fsf@benfinney.id.au>
	<4b8e929d$0$1585$742ec2ed@news.sonic.net>
	<hmmiks$1ru$1@dough.gmane.org>
Message-ID: <6cc20cea1003031417i15b66bcdi454bba5a9c642d95@mail.gmail.com>

On Wed, Mar 3, 2010 at 1:00 PM, Terry Reedy <tjreedy at udel.edu> wrote:
>
> People who are familiar with and like CPAN are free to help improve PyPI.
> Those of us not familiar with it may not know what we are missing, or have
> little idea about what works with CPAN.
>


CPAN also covers up some deficiencies in Perl that Python doesn't
suffer from. I am sure we could do well not to replicate those
features.

Regardless, Python's packages are distributed in a number of ways.
PyPI is only one of them. Fedora and Ubuntu are two other ways.

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From jgardner at jonathangardner.net  Wed Mar  3 17:18:00 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Wed, 3 Mar 2010 14:18:00 -0800
Subject: Generic singleton
In-Reply-To: <hmmjad$4gm$1@dough.gmane.org>
References: <mailman.222.1267642515.23598.python-list@python.org>
	<m2iq9d197a.fsf@googlemail.com> <hmmjad$4gm$1@dough.gmane.org>
Message-ID: <6cc20cea1003031418w5ad6f59ah91562243a2cc4afb@mail.gmail.com>

On Wed, Mar 3, 2010 at 1:11 PM, mk <mrkafk at gmail.com> wrote:
>
> Or I could make my life simpler and use global variable. :-)
>

Ding ding ding!

90% of Design Patterns is making Java suck less.

Other languages don't necessarily suffer from Java's design flaws.

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From ben+python at benfinney.id.au  Wed Mar  3 17:21:32 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 04 Mar 2010 09:21:32 +1100
Subject: There should be one-- and preferably only one --obvious way to do
	it
References: <mailman.170.1267608442.23598.python-list@python.org>
	<4b8e621b@dnews.tpgi.com.au>
Message-ID: <87iq9dujv7.fsf@benfinney.id.au>

Lie Ryan <lie.1296 at gmail.com> writes:

> There are lots of reason why bare-except is bad, one being is that it
> makes it way too easy to ignore errors that you don't actually want to
> silence; and given that bare-excepts would prevent Ctrl+C (Interrupt)
> from working. Sorry, but IMHO we shouldn't make syntax sugar for bad
> practices.

Right. Another way I've seen this expressed is ?It should be easy to
do the right thing, and awkward to do the wrong thing?.

-- 
 \       ?Everyone is entitled to their own opinions, but they are not |
  `\            entitled to their own facts.? ?US Senator Pat Moynihan |
_o__)                                                                  |
Ben Finney


From jgardner at jonathangardner.net  Wed Mar  3 17:23:25 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Wed, 3 Mar 2010 14:23:25 -0800
Subject: NoSQL Movement?
In-Reply-To: <fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
Message-ID: <6cc20cea1003031423v4410119dh767610e78ba3eb6e@mail.gmail.com>

On Wed, Mar 3, 2010 at 12:54 PM, ccc31807 <cartercc at gmail.com> wrote:
>
> As with anything else, you need to match the tool to the job. Yes, I
> feel that relational database technology has been much used, and much
> abused. However, one of my favorite applications is Postgres, and I
> think it's absolutely unbeatable where you have to store data and
> perform a large number of queries.
>

Let me elaborate on this point for those who haven't experienced this
for themselves.

When you are starting a new project and you don't have a definitive
picture of what the data is going to look like or how it is going to
be queried, SQL databases (like PostgreSQL) will help you quickly
formalize and understand what your data needs to do. In this role,
these databases are invaluable. I can see no comparable tool in the
wild, especially not OODBMS.

As you grow in scale, you may eventually reach a point where the
database can't keep up with you. Either you need to partition the data
across machines or you need more specialized and optimized query
plans. When you reach that point, there are a number of options that
don't include an SQL database. I would expect your project to move
those parts of the data away from an SQL database and towards a more
specific solution.

I see it as a sign of maturity with sufficiently scaled software that
they no longer use an SQL database to manage their data. At some point
in the project's lifetime, the data is understood well enough that the
general nature of the SQL database is unnecessary.

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From ben+python at benfinney.id.au  Wed Mar  3 17:30:35 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 04 Mar 2010 09:30:35 +1100
Subject: Working group for Python CPAN-equivalence?
References: <mailman.179.1267620332.23598.python-list@python.org>
	<87r5o1v8vp.fsf@benfinney.id.au>
	<4b8e929d$0$1585$742ec2ed@news.sonic.net>
	<mailman.239.1267650035.23598.python-list@python.org>
Message-ID: <87eik1ujg4.fsf@benfinney.id.au>

Terry Reedy <tjreedy at udel.edu> writes:

> On 3/3/2010 12:05 PM, John Nagle wrote:
> > CPAN is a repository. PyPi is an collection of links.
>
> As Ben said, PyPI currently is also a respository and not just links
> to other repositories.

It's a repository with holes. Just because a package is registered is no
indication that the package is available from PyPI.

> > CPAN has over 260 mirrors. PyPi has none.
>
> A mirroring system has been or is being set up with at least a couple
> of mirrors for things that are hosted at PyPI.

And that caveat is a big problem. Since PyPI allows registration of
packages that are not themselves hosted at PyPI (often because their
license terms are too restrictive for PyPI to redistribute the work),
the mirror system will miss them.

So there will be package-shaped holes in the PyPI mirror, meaning that
even well-specified dependencies and a reliable mirror network will not
be enough to make dependencies reliably satisfiable.

> > CPAN enforces standard organization on packages. PyPi does not.

This is, I think, something we don't need as much in Python; there is a
fundamental difference between Perl's deeply nested namespace hierarchy
and Python's inherently flat hierarchy.

> > CPAN has quality control, with testers and a test reporting system.
> > PyPi does not.
>
> People who are familiar with and like CPAN are free to help improve
> PyPI. Those of us not familiar with it may not know what we are
> missing, or have little idea about what works with CPAN.

An important first step would be to reject from PyPI any package that
isn't available for automated testing on the servers. That requires,
AFAICT, rejecting any package without the source package uploaded.

-- 
 \     ?Oh, I realize it's a penny here and a penny there, but look at |
  `\      me: I've worked myself up from nothing to a state of extreme |
_o__)                                          poverty.? ?Groucho Marx |
Ben Finney


From ben+python at benfinney.id.au  Wed Mar  3 17:32:21 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 04 Mar 2010 09:32:21 +1100
Subject: cpan for python?
References: <mailman.20.1267367545.23598.python-list@python.org>
	<hmjv4b$mqk$1@reader1.panix.com>
	<2010030214473616807-tomfsessile@gmailcom>
	<4b8ddea4$1@dnews.tpgi.com.au> <87ljea9f20.fsf@castleamber.com>
	<45b1599f-a05b-4132-9e75-89a52757e71b@q21g2000yqm.googlegroups.com>
	<877hpt46yw.fsf@castleamber.com>
Message-ID: <87aaupujd6.fsf@benfinney.id.au>

John Bokma <john at castleamber.com> writes:

> I want to remove something that I installed [with its Distutils build
> system] (because it's installation procedure seems to be broken;
> opensocial) I understand that this can't be blamed on pip, but it's
> odd that in this century it's still hard to install/uninstall modules
> :-(

That's because of the last-century legacy of Distutils's design.

-- 
 \       ?Imagine a world without hypothetical situations.? ?anonymous |
  `\                                                                   |
_o__)                                                                  |
Ben Finney


From peter at www.pjb.com.au  Wed Mar  3 17:37:02 2010
From: peter at www.pjb.com.au (Peter Billam)
Date: 03 Mar 2010 22:37:02 GMT
Subject: Working group for Python CPAN-equivalence?
References: <mailman.179.1267620332.23598.python-list@python.org>
	<87r5o1v8vp.fsf@benfinney.id.au>
	<4b8e929d$0$1585$742ec2ed@news.sonic.net>
Message-ID: <slrnhotp4e.26k.peter@box8.pjb.com.au>

On 2010-03-03, John Nagle <nagle at animats.com> wrote:
> Ben Finney wrote:
>> Olof Bjarnason <olof.bjarnason at gmail.com> writes:
>>> The "Where is CPAN for Python?" question keeps popping up, with
>>> answers ranging from "There is no CPAN for Python" and "We already
>>> have CPAN for Python" (confusing).
>> 
>> Caused in no small measure by the fact that Perl people mean at
>> least two distinct things by ?Where is CPAN for Python??:
>> * The central package registry, CPAN, with metadata in a standard
>>   queryable format, and all registered packages redundantly mirrored
>>   and available for installation at user-specified versions.
>>   We have an equivalent in PyPI, though it's incomplete since
>>   many *registered* packages are not actually hosted *at* PyPI.
>
>     CPAN is a repository.   PyPi is an collection of links.
>     CPAN has over 260 mirrors.  PyPi has none.
>     CPAN enforces standard organization on packages.  PyPi does not.
>     CPAN has quality control, with testers and a test reporting system.
>     PyPi does not.

One important thing that CPAN does _not_ have is a formalised
"I put this module up for adoption" mechanism.  Debian has one,
for example.  It's necessary, because not having one leads to
many (in the long run, all) modules becoming unmaintained and
abandoned, even though they worked perfectly well and were very
useful to people...

It would also be nice to be able to get module download stats.

A very important thing about CPAN modules is the consistent
basic install method:   perl Makefile.PL ; make ; make install

I'm not sure if the Perl code that runs CPAN is free software... (?)

Regards,  (CPAN author)  Peter

-- 
Peter Billam       www.pjb.com.au    www.pjb.com.au/comp/contact.html


From philip at semanchuk.com  Wed Mar  3 17:40:36 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Wed, 3 Mar 2010 17:40:36 -0500
Subject: taking python enterprise level?...
In-Reply-To: <hmmih7$1bs$1@dough.gmane.org>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>	<20100302015813.5397655e.darcy@druid.net>	<hmm2jc$28u$1@dough.gmane.org>
	<973824D8-3020-44A8-B2DA-501FF530457B@semanchuk.com>
	<hmmih7$1bs$1@dough.gmane.org>
Message-ID: <0C9B223A-D32A-474C-80E3-7F912447170F@semanchuk.com>


On Mar 3, 2010, at 3:58 PM, mk wrote:

> Philip Semanchuk wrote:
>>> So there *may* be some evidence that joins are indeed bad in  
>>> practice. If someone has smth specific/interesting on the subject,  
>>> please post.
>> It's an unprovable assertion, or a meaningless one depending on how  
>> one defines the terms. You could also say "there *may* be some  
>> evidence that Python lists are bad in practice". Python lists and  
>> SQL JOINs are like any part of a language or toolkit. They're good  
>> tools for solving certain classes of problems. They can also be  
>> misapplied to problems that they're not so good at. Sometimes  
>> they're a performance bottleneck, even when solving the problems  
>> for which they're best. Sometimes the best way to solve a  
>> performance bottleneck is to redesign your app/system so you don't  
>> need to solve that kind of problem anymore (hence the join-less  
>> databases). Other times, the cure is worse than the disease and  
>> you're better off throwing hardware at the problem.
>
> Look, I completely agree with what you're saying, but: that doesn't  
> change the possibility that joins may be expensive in comparison to  
> other SQL operations. This is the phrase I should have used perhaps;  
> 'expensive in comparison with other SQL operations' instead of 'bad'.

Well OK, but that's a very different argument. Yes, joins can be  
expensive. They're often still the best option, though. The first step  
people usually take to get away from joins is denormalization which  
can improve SELECT performance at the expense of slowing down INSERTs,  
UPDATEs, and DELETEs, not to mention complicating one's code and data  
model. Is that a worthwhile trade? Depends on the application. As I  
said, sometimes the cure is worse than the disease.

Don't worry about joins until you know they're a problem. As Knuth  
said, premature optimization is the root of all evil.

Good luck
Philip

PS - Looks like you're using Postgres -- excellent choice. I miss  
using it.




From me at privacy.net  Wed Mar  3 17:41:37 2010
From: me at privacy.net (Avid Fan)
Date: Wed, 03 Mar 2010 22:41:37 GMT
Subject: NoSQL Movement?
In-Reply-To: <mailman.256.1267655008.23598.python-list@python.org>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<mailman.256.1267655008.23598.python-list@python.org>
Message-ID: <BABjn.11012$pv.4575@news-server.bigpond.net.au>

Jonathan Gardner wrote:

> 
> I see it as a sign of maturity with sufficiently scaled software that
> they no longer use an SQL database to manage their data. At some point
> in the project's lifetime, the data is understood well enough that the
> general nature of the SQL database is unnecessary.
> 

I am really struggling to understand this concept.

Is it the normalised table structure that is in question or the query 
language?

Could you give some sort of example of where SQL would not be the way to 
go.   The only things I can think of a simple flat file databases.


From drobinow at gmail.com  Wed Mar  3 18:16:47 2010
From: drobinow at gmail.com (David Robinow)
Date: Wed, 3 Mar 2010 18:16:47 -0500
Subject: Docstrings considered too complicated
In-Reply-To: <hmmf8k$5vl$1@reader1.panix.com>
References: <20100303114603.7021e9ba.darcy@druid.net>
	<539252.91463.qm@web58904.mail.re1.yahoo.com>
	<mailman.230.1267645508.23598.python-list@python.org>
	<hmmf8k$5vl$1@reader1.panix.com>
Message-ID: <4eb0089f1003031516u473ce06ejb705feb85ece66a7@mail.gmail.com>

On Wed, Mar 3, 2010 at 3:02 PM, Grant Edwards <invalid at invalid.invalid> wrote:
> On 2010-03-03, mk <mrkafk at gmail.com> wrote:
>
>>> That has always puzzled me to. ETX and EOT were well established, why
>>> no use one of them? I'd love to know what they were thinking.
>>
>> Probably nothing: what many people do with confronted with a problem.
>>
>> It reminds me of why Windows uses backslashes for path separation
>> instead of slashes: what I've *heard*, and do not know if it's true,
>> it's because Gates fancied using / for options switch instead of -,
>> and to hell with established practice.
>
> Using / for the option switch _was_ the established practice (if you
> came from a DEC background the way that CP/M and DOS did).
Quite true. And the early DEC systems predated Unix (although not by much)


From jml at mumak.net  Wed Mar  3 18:25:36 2010
From: jml at mumak.net (Jonathan Lange)
Date: Wed, 3 Mar 2010 23:25:36 +0000
Subject: Twisted 10.0.0 released
Message-ID: <d06a5cd31003031525h33ea08b4k4c4a2aff0e7c7fe8@mail.gmail.com>

On behalf of Twisted Matrix Laboratories, I am honored to announce the
release of Twisted 10.0.

Highlights include:

 * Improved documentation, including "Twisted Web in 60 seconds"

 * Faster Perspective Broker applications

 * A new Windows installer that ships without zope.interface

 * Twisted no longer supports Python 2.3

 * Over one hundred closed tickets

For more information, see the NEWS file.

It's stable, backwards compatible, well tested and in every way an
improvement. Download it now from:

 http://tmrc.mit.edu/mirror/twisted/Twisted/10.0/Twisted-10.0.0.tar.bz2 or
 http://tmrc.mit.edu/mirror/twisted/Twisted/10.0/Twisted-10.0.0.win32-py2.5.msi

Many thanks to Jean-Paul Calderone and Chris Armstrong, whose work on
release automation tools and answers to numerous questions made this
possible. Thanks also to the supporters of the Twisted Software
Foundation and to the many contributors for this release.

jml


From robert.kern at gmail.com  Wed Mar  3 18:28:35 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 03 Mar 2010 17:28:35 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <hmmkmh$mt1$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>
	<hmmkmh$mt1$1@news.eternal-september.org>
Message-ID: <hmmrb3$e4$1@dough.gmane.org>

On 2010-03-03 15:35 PM, Alf P. Steinbach wrote:
> * Robert Kern:
>> On 2010-03-03 13:32 PM, Alf P. Steinbach wrote:
>>> * Robert Kern:
>>>> On 2010-03-03 11:18 AM, Alf P. Steinbach wrote:
>>>>> * Robert Kern:
>>>>>> On 2010-03-03 09:56 AM, Alf P. Steinbach wrote:
>>>>>>> * Mike Kent:
>>>>>>>> What's the compelling use case for this vs. a simple try/finally?
>>>>>>>
>>>>>>> if you thought about it you would mean a simple "try/else".
>>>>>>> "finally" is
>>>>>>> always executed. which is incorrect for cleanup
>>>>>>
>>>>>> Eh? Failed execution doesn't require cleanup? The example you gave is
>>>>>> definitely equivalent to the try: finally: that Mike posted.
>>>>>
>>>>> Sorry, that's incorrect: it's not.
>>>>>
>>>>> With correct code (mine) cleanup for action A is only performed when
>>>>> action A succeeds.
>>>>>
>>>>> With incorrect code cleanup for action A is performed when A fails.
>>>>
>>>> Oh?
>>>>
>>>> $ cat cleanup.py
>>>>
>>>> class Cleanup:
>>>> def __init__( self ):
>>>> self._actions = []
>>>>
>>>> def call( self, action ):
>>>> assert( callable( action ) )
>>>> self._actions.append( action )
>>>>
>>>> def __enter__( self ):
>>>> return self
>>>>
>>>> def __exit__( self, x_type, x_value, x_traceback ):
>>>> while( len( self._actions ) != 0 ):
>>>> try:
>>>> self._actions.pop()()
>>>> except BaseException as x:
>>>> raise AssertionError( "Cleanup: exception during cleanup" )
>>>>
>>>> def print_(x):
>>>> print x
>>>>
>>>> with Cleanup() as at_cleanup:
>>>> at_cleanup.call(lambda: print_("Cleanup executed without an
>>>> exception."))
>>>>
>>>> with Cleanup() as at_cleanup:
>>>
>>> *Here* is where you should
>>>
>>> 1) Perform the action for which cleanup is needed.
>>>
>>> 2) Let it fail by raising an exception.
>>>
>>>
>>>> at_cleanup.call(lambda: print_("Cleanup execute with an exception."))
>>>> raise RuntimeError()
>>>
>>> With an exception raised here cleanup should of course be performed.
>>>
>>> And just in case you didn't notice: the above is not a test of the
>>> example I gave.
>>>
>>>
>>>> $ python cleanup.py
>>>> Cleanup executed without an exception.
>>>> Cleanup execute with an exception.
>>>> Traceback (most recent call last):
>>>> File "cleanup.py", line 28, in <module>
>>>> raise RuntimeError()
>>>> RuntimeError
>>>>
>>>>>> The actions are always executed in your example,
>>>>>
>>>>> Sorry, that's incorrect.
>>>>
>>>> Looks like it to me.
>>>
>>> I'm sorry, but you're
>>>
>>> 1) not testing my example which you're claiming that you're testing, and
>>
>> Then I would appreciate your writing a complete, runnable example that
>> demonstrates the feature you are claiming. Because it's apparently not
>> "ensur[ing] some desired cleanup at the end of a scope, even when the
>> scope is exited via an exception" that you talked about in your
>> original post.
>>
>> Your sketch of an example looks like mine:
>>
>> with Cleanup as at_cleanup:
>> # blah blah
>> chdir( somewhere )
>> at_cleanup.call( lambda: chdir( original_dir ) )
>> # blah blah
>>
>> The cleanup function gets registered immediately after the first
>> chdir() and before the second "blah blah". Even if an exception is
>> raised in the second "blah blah", then the cleanup function will still
>> run. This would be equivalent to a try: finally:
>>
>> # blah blah #1
>> chdir( somewhere )
>> try:
>> # blah blah #2
>> finally:
>> chdir( original_dir )
>
> Yes, this is equivalent code.
>
> The try-finally that you earlier claimed was equivalent, was not.

Okay, but just because of the position of the chdir(), right?

>> and not a try: else:
>>
>> # blah blah #1
>> chdir( somewhere )
>> try:
>> # blah blah #2
>> else:
>> chdir( original_dir )
>
> This example is however meaningless except as misdirection. There are
> infinitely many constructs that include try-finally and try-else, that
> the with-Cleanup code is not equivalent to. It's dumb to show one such.
>
> Exactly what are you trying to prove here?

I'm just showing you what I thought you meant when you told Mike that he should 
have used a try/else instead of try/finally.

> Your earlier claims are still incorrect.
>
>> Now, I assumed that the behavior with respect to exceptions occurring
>> in the first "blah blah" weren't what you were talking about because
>> until the chdir(), there is nothing to clean up.
>>
>> There is no way that the example you gave translates to a try: else:
>> as you claimed in your response to Mike Kent.
>
> Of course there is.
>
> Note that Mike wrapped the action A within the 'try':
>
>
> <code author="Mike" correct="False">
> original_dir = os.getcwd()
> try:
> os.chdir(somewhere)
> # Do other stuff
> finally:
> os.chdir(original_dir)
> # Do other cleanup
> </code>
>
>
> The 'finally' he used, shown above, yields incorrect behavior.
>
> Namely cleanup always, while 'else', in that code, can yield correct
> behavior /provided/ that it's coded correctly:
>
>
> <code author="Alf" correct="ProbablyTrue" disclaimer="off the cuff">
> original_dir = os.getcwd()
> try:
> os.chdir(somewhere)
> except Whatever:
> # whatever, e.g. logging
> raise
> else:
> try:
> # Do other stuff
> finally:
> os.chdir(original_dir)
> # Do other cleanup
> </code>

Ah, okay. Now we're getting somewhere. Now, please note that you did not have 
any except: handling in your original example. So Mike made a try: finally: 
example to attempt to match the semantics of your code. When you tell him that 
he should 'mean a simple "try/else". "finally" is always executed. which is 
incorrect for cleanup', can you understand why we might think that you were 
saying that try: finally: was wrong and that you were proposing that your code 
was equivalent to some try: except: else: suite?

>>> 2) not even showing anything about your earlier statements, which were
>>> just incorrect.
>>>
>>> You're instead showing that my code works as it should for the case that
>>> you're testing, which is a bit unnecessary since I knew that, but thanks
>>> anyway.
>>
>> It's the case you seem to be talking about in your original post.
>
> What's this "seems"? Are you unable to read that very short post?

I say "seems" because my understandings of what you meant in your original post 
and your response to Mike disagreed with one another. Now I see that your later 
posts were talking about minor discrepancy about which errors you wanted caught 
by the finally: and which you didn't. I was confused because it seemed that you 
were saying that try: finally: was completely wrong and that "try/else" was 
right. It confused me and at least one other person.

>> , but I do ask you to acknowledge that you originally were talking
>> about a feature that "ensure[s] some desired cleanup at the end of a
>> scope, even when the scope is exited via an exception."
>
> Yes, that's what it does.
>
> Which is I why I wrote that.
>
> This should not be hard to grok.
>
>
>> Do you acknowledge this?
>
> This seems like pure noise, to cover up that you were sputing a lot of
> incorrect statements earlier.

No, I'm just trying to clarify what you are trying to say. The above statement 
did not appear to accord with your later statement: 'if you thought about it you 
would mean a simple "try/else". "finally" is always executed. which is incorrect 
for cleanup.' It turns out that what you really meant was that it would be 
incorrect for cleanup to be executed when an error occurred in the chdir() itself.

Now, I happen to disagree with that. There are a couple of ways to do this kind 
of cleanup depending on the situation. Basically, you have several different 
code blocks:

# 1. Record original state.
# 2. Modify state.
# 3. Do stuff requiring the modified state.
# 4. Revert to the original state.

Depending on where errors are expected to occur, and how the state needs to get 
modified and restored, there are different ways of arranging these blocks. The 
one Mike showed:

# 1. Record original state.
try:
     # 2. Modify state.
     # 3. Do stuff requiring the modified state.
finally:
     # 4. Revert to the original state.

And the one you prefer:

# 1. Record original state.
# 2. Modify state.
try:
     # 3. Do stuff requiring the modified state.
finally:
     # 4. Revert to the original state.

These differ in what happens when an error occurs in block #2, the modification 
of the state. In Mike's, the cleanup code runs; in yours, it doesn't. For 
chdir(), it really doesn't matter. Reverting to the original state is harmless 
whether the original chdir() succeeds or fails, and chdir() is essentially 
atomic so if it raises an exception, the state did not change and nothing needs 
to be cleaned up.

However, not all block #2s are atomic. Some are going to fail partway through 
and need to be cleaned up even though they raised an exception. Fortunately, 
cleanup can frequently be written to not care whether the whole thing finished 
or not.

Both formulations can be correct (and both work perfectly fine with the chdir() 
example being used). Sometimes one is better than the other, and sometimes not. 
You can achieve both ways with either your Cleanup class or with try: finally:.

I am still of the opinion that Cleanup is not an improvement over try: finally: 
and has the significant ugliness of forcing cleanup code into callables. This 
significantly limits what you can do in your cleanup code.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From eike.welk at gmx.net  Wed Mar  3 18:33:29 2010
From: eike.welk at gmx.net (Eike Welk)
Date: Thu, 04 Mar 2010 00:33:29 +0100
Subject: Method / Functions - What are the differences?
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
	<mailman.109.1267539415.23598.python-list@python.org>
	<hmk1mn$70u$1@newsreader3.netcologne.de>
	<4b8e4041$0$17447$426a34cc@news.free.fr>
	<hmlte9$d0f$1@dough.gmane.org>
	<mailman.205.1267633968.23598.python-list@python.org>
	<4b8e9660$0$21812$426a34cc@news.free.fr>
Message-ID: <hmmrh4$644$1@newsreader3.netcologne.de>

Bruno Desthuilliers wrote:
> John Posner a ?crit :
>> Done -- see http://wiki.python.org/moin/FromFunctionToMethod
> 
> Done and well done !-)
> Thanks again for the good job John.

I like it too, thanks to both of you!

I have two small ideas for improvement: 
- Swap the first two paragraphs. First say what it is, and then give the 
motivation.
- The section about the descriptor protocol is a bit difficult to 
understand. But judging from the official descriptor documentation, it seems 
to be hard to explain: The official documentation is nearly incomprehensible 
(IMHO).
 


From philip at semanchuk.com  Wed Mar  3 18:43:30 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Wed, 3 Mar 2010 18:43:30 -0500
Subject: Working group for Python CPAN-equivalence?
In-Reply-To: <6cc20cea1003031417i15b66bcdi454bba5a9c642d95@mail.gmail.com>
References: <mailman.179.1267620332.23598.python-list@python.org>
	<87r5o1v8vp.fsf@benfinney.id.au>
	<4b8e929d$0$1585$742ec2ed@news.sonic.net>
	<hmmiks$1ru$1@dough.gmane.org>
	<6cc20cea1003031417i15b66bcdi454bba5a9c642d95@mail.gmail.com>
Message-ID: <882E7C2F-08E5-491A-A74C-572E37F333D1@semanchuk.com>


On Mar 3, 2010, at 5:17 PM, Jonathan Gardner wrote:

> On Wed, Mar 3, 2010 at 1:00 PM, Terry Reedy <tjreedy at udel.edu> wrote:
>>
>> People who are familiar with and like CPAN are free to help improve  
>> PyPI.
>> Those of us not familiar with it may not know what we are missing,  
>> or have
>> little idea about what works with CPAN.
>>
>
>
> CPAN also covers up some deficiencies in Perl that Python doesn't
> suffer from. I am sure we could do well not to replicate those
> features.
>
> Regardless, Python's packages are distributed in a number of ways.
> PyPI is only one of them. Fedora and Ubuntu are two other ways.

Do Fedora & Ubuntu's package managers offer modules that appear in  
CPAN? In other words, if I was a Perl user under Ubuntu would I use  
the pkg manager to add a Perl module, or CPAN, or would both work?


Thanks
Philip



From thewellsoliver at gmail.com  Wed Mar  3 18:45:51 2010
From: thewellsoliver at gmail.com (Wells)
Date: Wed, 3 Mar 2010 15:45:51 -0800 (PST)
Subject: Question about typing: ints/floats
Message-ID: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>

This seems sort of odd to me:

>>> a = 1
>>> a += 1.202
>>> a
2.202

Indicates that 'a' was an int that was implicitly casted to a float.
But:

>>> a = 1
>>> b = 3
>>> a / b
0

This does not implicitly do the casting, it treats 'a' and 'b' as
integers, and the result as well. Changing 'b' to 3.0 will yield a
float as a result (0.33333333333333331)

Is there some way to explain the consistency here? Does python
implicitly change the casting when you add variables of a different
numeric type?

Anyway, just  curiosity more than anything else. Thanks!


From zeeshan.quireshi at gmail.com  Wed Mar  3 18:50:19 2010
From: zeeshan.quireshi at gmail.com (Zeeshan Quireshi)
Date: Wed, 3 Mar 2010 15:50:19 -0800 (PST)
Subject: Passing FILE * types using ctypes
Message-ID: <a83319d7-c199-4532-9816-d002f7fd7914@q16g2000yqq.googlegroups.com>

Hello, I'm using ctypes to wrap a library i wrote. I am trying to pass
it a FILE *pointer, how do i open a file in Python and convert it to a
FILE *pointer. Or do i have to call the C library using ctypes first,
get the pointer and then pass it to my function.

Also, is there any automated way to convert c struct and enum
definitions to ctypes data types.

Zeeshan


From zeeshan.quireshi at gmail.com  Wed Mar  3 18:53:27 2010
From: zeeshan.quireshi at gmail.com (Zeeshan Quireshi)
Date: Wed, 3 Mar 2010 15:53:27 -0800 (PST)
Subject: Question about typing: ints/floats
References: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
Message-ID: <b800048f-b09e-4c39-bf15-9bcd3dae11bc@y11g2000yqh.googlegroups.com>

On Mar 3, 6:45?pm, Wells <thewellsoli... at gmail.com> wrote:
> This seems sort of odd to me:
>
> >>> a = 1
> >>> a += 1.202
> >>> a
>
> 2.202
>
> Indicates that 'a' was an int that was implicitly casted to a float.
> But:
>
> >>> a = 1
> >>> b = 3
> >>> a / b
>
> 0
>
> This does not implicitly do the casting, it treats 'a' and 'b' as
> integers, and the result as well. Changing 'b' to 3.0 will yield a
> float as a result (0.33333333333333331)
>
> Is there some way to explain the consistency here? Does python
> implicitly change the casting when you add variables of a different
> numeric type?
>
> Anyway, just ?curiosity more than anything else. Thanks!

Python, like most other languages performs only integer division when
both the operands are ints. So only if one of the types is a flot or
you explicitly cast your expression to be a double, then the value
will be a fraction. otherwise you will the quotient.


From rhodri at wildebst.demon.co.uk  Wed Mar  3 18:56:00 2010
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Wed, 03 Mar 2010 23:56:00 -0000
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<eq4l57-okf2.ln1@ozzie.tundraware.com>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <7uu1ooFiipU1@mid.individual.net>
	<4B89D8BE.2040905@mrabarnett.plus.com> <4B8B9845.70604@sequans.com>
	<mailman.59.1267456634.23598.python-list@python.org>
	<7v695nFa0fU1@mid.individual.net>
	<4B8E7538.2080003@mrabarnett.plus.com>
	<20100303111248.7f40d659.darcy@druid.net>
	<hmm7l9$m4f$1@dough.gmane.org>
	<mailman.228.1267645124.23598.python-list@python.org>
Message-ID: <op.u80nfmlca8ncjz@gnudebst>

On Wed, 03 Mar 2010 19:38:16 -0000, Steve Holden <steve at holdenweb.com>  
wrote:

> mk wrote:
>> D'Arcy J.M. Cain wrote:
>>
>>> Makes me want to go down to the basement and fire up the Altair.  :-)
>>
>> Please don't, or else I fire up that univ Yugoslavian copy of VAX with
>> Pascal compiler (where I wrote my first program) and I will start my
>> first program of ping-pong.
>>
>> It was a few hundred lines but took 5 minutes to compile; "VAX" was
>> theoretically multitasking, but when more than 3 people were trying to
>> do smth on it simultaneously, it was basically seizing up.
>>
>> Regards,
>> mk
>>
> Puts me in mind of Mario Wolczko's early attempts to implement SmallTalk
> on a VAX 11/750. The only bitmapped display we had available was a Three
> Rivers PERQ, connected by a 9600bps serial line. We left it running at
> seven o'clock one evening, and by nine am the next day it had brought up
> about two thirds of the initial VM loader screen ...
>
> You tell these young kids, and they just don't believe you!

There's old, and then there's old.  http://sms.cam.ac.uk/media/739532 is a  
film of EDSAC being programmed in 1951, with a commentary added by Maurice  
Wilkes in 1976.  Maybe just a bit before my time (by a decade or so :-)

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


From jjposner at optimum.net  Wed Mar  3 18:56:07 2010
From: jjposner at optimum.net (John Posner)
Date: Wed, 03 Mar 2010 18:56:07 -0500
Subject: Method / Functions - What are the differences?
In-Reply-To: <hmmrh4$644$1@newsreader3.netcologne.de>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
	<mailman.109.1267539415.23598.python-list@python.org>
	<hmk1mn$70u$1@newsreader3.netcologne.de>
	<4b8e4041$0$17447$426a34cc@news.free.fr>
	<hmlte9$d0f$1@dough.gmane.org>
	<mailman.205.1267633968.23598.python-list@python.org>
	<4b8e9660$0$21812$426a34cc@news.free.fr>
	<hmmrh4$644$1@newsreader3.netcologne.de>
Message-ID: <4B8EF717.3070701@optimum.net>

On 3/3/2010 6:33 PM, Eike Welk wrote:
>
> I have two small ideas for improvement:
> - Swap the first two paragraphs. First say what it is, and then give the
> motivation.

No problem -- since this is a Wiki, you can perform the swap yourself! 
(If you haven't done it in a day or so, I'll do the deed.)

> - The section about the descriptor protocol is a bit difficult to
> understand. But judging from the official descriptor documentation, it seems
> to be hard to explain: The official documentation is nearly incomprehensible
> (IMHO).

I empathize -- it took me a while to grok descriptors. I was thinking 
today about "doing a Bruno", and producing similar pieces on:

* properties created with the @property decorator

* the descriptor protocol

I'll try to produce something over the next couple of days.

-John


From jgardner at jonathangardner.net  Wed Mar  3 19:10:14 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Wed, 3 Mar 2010 16:10:14 -0800
Subject: PYTHONPATH and eggs
In-Reply-To: <86ee3b75-b3f5-4172-90c8-e90f0e50b89f@a18g2000yqc.googlegroups.com>
References: <86ee3b75-b3f5-4172-90c8-e90f0e50b89f@a18g2000yqc.googlegroups.com>
Message-ID: <6cc20cea1003031610i6f79fd4fndac249ba27ca44c6@mail.gmail.com>

On Wed, Mar 3, 2010 at 2:14 AM, geoffbache <geoff.bache at jeppesen.com> wrote:
>
> I have a very simple problem that seems to have no simple solution.
>
> I have a module which is installed centrally and lives in a Python
> egg. I have experimented with some minor changes to it and would like
> to set my PYTHONPATH to pick up my local copy of it, but don't want to
> have to figure out how to build my own version of the "egg" if
> possible.
>
> Unfortunately, the location from PYTHONPATH ends up after the eggs in
> sys.path so I can't persuade Python to import my version. The only way
> I've found to fix it is to copy the main script and manually hack
> sys.path at the start of it which isn't really very nice. I wonder if
> there is any better way as I can't be the first person to want to do
> this, surely?
>
> I've seen this issue has been discussed elsewhere and flagged as a
> problem (e.g.
> http://mail.python.org/pipermail/distutils-sig/2009-January/010755.html)
>
> but I've been unable to find any suggestions for workarounds or
> indications whether this will be/has been fixed.
>

Sounds like you might need to use virtualenv to setup python
environments that you can control.

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From rhodri at wildebst.demon.co.uk  Wed Mar  3 19:11:26 2010
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Thu, 04 Mar 2010 00:11:26 -0000
Subject: Interest check in some delicious syntactic sugar for "except:pass"
References: <mailman.170.1267608442.23598.python-list@python.org>
Message-ID: <op.u80n5cq4a8ncjz@gnudebst>

On Wed, 03 Mar 2010 09:27:16 -0000, Oren Elrad <orenelrad at gmail.com> wrote:

> Howdy all, longtime appreciative user, first time mailer-inner.
> I'm wondering if there is any support (tepid better than none) for the
> following syntactic sugar:
> silence:
> ........ block
> ------------------------->
> try:
> ........block
> except:
> ........pass

-100

This catches Control-C interrupts, sys.exit(), subtle typos in the code,  
and sundry other errors that actually you *did* want to know about.   
Silence isn't so much golden as pyritic.

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


From mensanator at aol.com  Wed Mar  3 19:27:50 2010
From: mensanator at aol.com (Mensanator)
Date: Wed, 3 Mar 2010 16:27:50 -0800 (PST)
Subject: Question about typing: ints/floats
References: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
Message-ID: <b88bceed-bbd1-4e40-85b6-206cd5569674@e7g2000yqf.googlegroups.com>

On Mar 3, 5:45?pm, Wells <thewellsoli... at gmail.com> wrote:
> This seems sort of odd to me:
>
> >>> a = 1
> >>> a += 1.202
> >>> a
>
> 2.202
>
> Indicates that 'a' was an int that was implicitly casted to a float.
> But:
>
> >>> a = 1
> >>> b = 3
> >>> a / b
>
> 0
>
> This does not implicitly do the casting, it treats 'a' and 'b' as
> integers, and the result as well.

Not in Python 3.1:
Python 3.1 (r31:73574, Jun 26 2009, 20:21:35) [MSC v.1500 32 bit
(Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> a = 1
>>> b = 3
>>> a/b
0.3333333333333333



> Changing 'b' to 3.0 will yield a
> float as a result (0.33333333333333331)
>
> Is there some way to explain the consistency here?

Yes, use Python 3.1.

> Does python
> implicitly change the casting when you add variables of a different
> numeric type?

Sometimes. Floats and ints are compatible. But this doesn't work:

>>> '3' + 1
Traceback (most recent call last):
  File "<pyshell#4>", line 1, in <module>
    '3' + 1
TypeError: Can't convert 'int' object to str implicitly


>
> Anyway, just ?curiosity more than anything else. Thanks!



From alfps at start.no  Wed Mar  3 19:49:45 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Thu, 04 Mar 2010 01:49:45 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.260.1267658935.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>
	<mailman.260.1267658935.23598.python-list@python.org>
Message-ID: <hmn03d$5r6$1@news.eternal-september.org>

* Robert Kern:
> On 2010-03-03 15:35 PM, Alf P. Steinbach wrote:
>> * Robert Kern:
>>> On 2010-03-03 13:32 PM, Alf P. Steinbach wrote:
>>>> * Robert Kern:
>>>>> On 2010-03-03 11:18 AM, Alf P. Steinbach wrote:
>>>>>> * Robert Kern:
>>>>>>> On 2010-03-03 09:56 AM, Alf P. Steinbach wrote:
>>>>>>>> * Mike Kent:
>>>>>>>>> What's the compelling use case for this vs. a simple try/finally?
>>>>>>>>
>>>>>>>> if you thought about it you would mean a simple "try/else".
>>>>>>>> "finally" is
>>>>>>>> always executed. which is incorrect for cleanup
>>>>>>>
>>>>>>> Eh? Failed execution doesn't require cleanup? The example you 
>>>>>>> gave is
>>>>>>> definitely equivalent to the try: finally: that Mike posted.
>>>>>>
>>>>>> Sorry, that's incorrect: it's not.
>>>>>>
>>>>>> With correct code (mine) cleanup for action A is only performed when
>>>>>> action A succeeds.
>>>>>>
>>>>>> With incorrect code cleanup for action A is performed when A fails.
>>>>>
>>>>> Oh?
>>>>>
>>>>> $ cat cleanup.py
>>>>>
>>>>> class Cleanup:
>>>>> def __init__( self ):
>>>>> self._actions = []
>>>>>
>>>>> def call( self, action ):
>>>>> assert( callable( action ) )
>>>>> self._actions.append( action )
>>>>>
>>>>> def __enter__( self ):
>>>>> return self
>>>>>
>>>>> def __exit__( self, x_type, x_value, x_traceback ):
>>>>> while( len( self._actions ) != 0 ):
>>>>> try:
>>>>> self._actions.pop()()
>>>>> except BaseException as x:
>>>>> raise AssertionError( "Cleanup: exception during cleanup" )
>>>>>
>>>>> def print_(x):
>>>>> print x
>>>>>
>>>>> with Cleanup() as at_cleanup:
>>>>> at_cleanup.call(lambda: print_("Cleanup executed without an
>>>>> exception."))
>>>>>
>>>>> with Cleanup() as at_cleanup:
>>>>
>>>> *Here* is where you should
>>>>
>>>> 1) Perform the action for which cleanup is needed.
>>>>
>>>> 2) Let it fail by raising an exception.
>>>>
>>>>
>>>>> at_cleanup.call(lambda: print_("Cleanup execute with an exception."))
>>>>> raise RuntimeError()
>>>>
>>>> With an exception raised here cleanup should of course be performed.
>>>>
>>>> And just in case you didn't notice: the above is not a test of the
>>>> example I gave.
>>>>
>>>>
>>>>> $ python cleanup.py
>>>>> Cleanup executed without an exception.
>>>>> Cleanup execute with an exception.
>>>>> Traceback (most recent call last):
>>>>> File "cleanup.py", line 28, in <module>
>>>>> raise RuntimeError()
>>>>> RuntimeError
>>>>>
>>>>>>> The actions are always executed in your example,
>>>>>>
>>>>>> Sorry, that's incorrect.
>>>>>
>>>>> Looks like it to me.
>>>>
>>>> I'm sorry, but you're
>>>>
>>>> 1) not testing my example which you're claiming that you're testing, 
>>>> and
>>>
>>> Then I would appreciate your writing a complete, runnable example that
>>> demonstrates the feature you are claiming. Because it's apparently not
>>> "ensur[ing] some desired cleanup at the end of a scope, even when the
>>> scope is exited via an exception" that you talked about in your
>>> original post.
>>>
>>> Your sketch of an example looks like mine:
>>>
>>> with Cleanup as at_cleanup:
>>> # blah blah
>>> chdir( somewhere )
>>> at_cleanup.call( lambda: chdir( original_dir ) )
>>> # blah blah
>>>
>>> The cleanup function gets registered immediately after the first
>>> chdir() and before the second "blah blah". Even if an exception is
>>> raised in the second "blah blah", then the cleanup function will still
>>> run. This would be equivalent to a try: finally:
>>>
>>> # blah blah #1
>>> chdir( somewhere )
>>> try:
>>> # blah blah #2
>>> finally:
>>> chdir( original_dir )
>>
>> Yes, this is equivalent code.
>>
>> The try-finally that you earlier claimed was equivalent, was not.
> 
> Okay, but just because of the position of the chdir(), right?

Yes, since it yields different results.


>>> and not a try: else:
>>>
>>> # blah blah #1
>>> chdir( somewhere )
>>> try:
>>> # blah blah #2
>>> else:
>>> chdir( original_dir )
>>
>> This example is however meaningless except as misdirection. There are
>> infinitely many constructs that include try-finally and try-else, that
>> the with-Cleanup code is not equivalent to. It's dumb to show one such.
>>
>> Exactly what are you trying to prove here?
> 
> I'm just showing you what I thought you meant when you told Mike that he 
> should have used a try/else instead of try/finally.
> 
>> Your earlier claims are still incorrect.
>>
>>> Now, I assumed that the behavior with respect to exceptions occurring
>>> in the first "blah blah" weren't what you were talking about because
>>> until the chdir(), there is nothing to clean up.
>>>
>>> There is no way that the example you gave translates to a try: else:
>>> as you claimed in your response to Mike Kent.
>>
>> Of course there is.
>>
>> Note that Mike wrapped the action A within the 'try':
>>
>>
>> <code author="Mike" correct="False">
>> original_dir = os.getcwd()
>> try:
>> os.chdir(somewhere)
>> # Do other stuff
>> finally:
>> os.chdir(original_dir)
>> # Do other cleanup
>> </code>
>>
>>
>> The 'finally' he used, shown above, yields incorrect behavior.
>>
>> Namely cleanup always, while 'else', in that code, can yield correct
>> behavior /provided/ that it's coded correctly:
>>
>>
>> <code author="Alf" correct="ProbablyTrue" disclaimer="off the cuff">
>> original_dir = os.getcwd()
>> try:
>> os.chdir(somewhere)
>> except Whatever:
>> # whatever, e.g. logging
>> raise
>> else:
>> try:
>> # Do other stuff
>> finally:
>> os.chdir(original_dir)
>> # Do other cleanup
>> </code>
> 
> Ah, okay. Now we're getting somewhere. Now, please note that you did not 
> have any except: handling in your original example. So Mike made a try: 
> finally: example to attempt to match the semantics of your code. When 
> you tell him that he should 'mean a simple "try/else". "finally" is 
> always executed. which is incorrect for cleanup', can you understand why 
> we might think that you were saying that try: finally: was wrong and 
> that you were proposing that your code was equivalent to some try: 
> except: else: suite?

No, not really. His code didn't match the semantics. Changing 'finally' to 
'else' could make it equivalent.


>>>> 2) not even showing anything about your earlier statements, which were
>>>> just incorrect.
>>>>
>>>> You're instead showing that my code works as it should for the case 
>>>> that
>>>> you're testing, which is a bit unnecessary since I knew that, but 
>>>> thanks
>>>> anyway.
>>>
>>> It's the case you seem to be talking about in your original post.
>>
>> What's this "seems"? Are you unable to read that very short post?
> 
> I say "seems" because my understandings of what you meant in your 
> original post and your response to Mike disagreed with one another. Now 
> I see that your later posts were talking about minor discrepancy about 
> which errors you wanted caught by the finally: and which you didn't.

It's absolutely not a minor discrepancy whether some code is executed or not. It 
can have arbitrarily large effect. And from my point of view the discussion of 
that snippet has not been about what errors I "want" caught by the 'finally'; 
it's been about whether two snippets of code yield the same effect or not: 
Mike's code was incorrect not because it did something else, but because as code 
that did something else it was not an equivalent to the code that I posted.


> I 
> was confused because it seemed that you were saying that try: finally: 
> was completely wrong and that "try/else" was right. It confused me and 
> at least one other person.
> 
>>> , but I do ask you to acknowledge that you originally were talking
>>> about a feature that "ensure[s] some desired cleanup at the end of a
>>> scope, even when the scope is exited via an exception."
>>
>> Yes, that's what it does.
>>
>> Which is I why I wrote that.
>>
>> This should not be hard to grok.
>>
>>
>>> Do you acknowledge this?
>>
>> This seems like pure noise, to cover up that you were sputing a lot of
>> incorrect statements earlier.
> 
> No, I'm just trying to clarify what you are trying to say. The above 
> statement did not appear to accord with your later statement: 'if you 
> thought about it you would mean a simple "try/else". "finally" is always 
> executed. which is incorrect for cleanup.' It turns out that what you 
> really meant was that it would be incorrect for cleanup to be executed 
> when an error occurred in the chdir() itself.
> 
> Now, I happen to disagree with that.

Well, I was pretty unclear, almost hint-like, sorry about that, mea culpa, but 
you have it slightly wrong. You wrote then "The example you gave is definitely 
equivalent to the try: finally: that Mike posted." And it isn't.


> There are a couple of ways to do 
> this kind of cleanup depending on the situation. Basically, you have 
> several different code blocks:
> 
> # 1. Record original state.
> # 2. Modify state.
> # 3. Do stuff requiring the modified state.
> # 4. Revert to the original state.
> 
> Depending on where errors are expected to occur, and how the state needs 
> to get modified and restored, there are different ways of arranging 
> these blocks. The one Mike showed:
> 
> # 1. Record original state.
> try:
>     # 2. Modify state.
>     # 3. Do stuff requiring the modified state.
> finally:
>     # 4. Revert to the original state.
> 
> And the one you prefer:
> 
> # 1. Record original state.
> # 2. Modify state.
> try:
>     # 3. Do stuff requiring the modified state.
> finally:
>     # 4. Revert to the original state.
> 
> These differ in what happens when an error occurs in block #2, the 
> modification of the state. In Mike's, the cleanup code runs; in yours, 
> it doesn't. For chdir(), it really doesn't matter. Reverting to the 
> original state is harmless whether the original chdir() succeeds or 
> fails, and chdir() is essentially atomic so if it raises an exception, 
> the state did not change and nothing needs to be cleaned up.
> 
> However, not all block #2s are atomic. Some are going to fail partway 
> through and need to be cleaned up even though they raised an exception. 
> Fortunately, cleanup can frequently be written to not care whether the 
> whole thing finished or not.

Yeah, and there are some systematic ways to handle these things. You might look 
up Dave Abraham's levels of exception safety. Mostly his approach boils down to 
making operations effectively atomic so as to reduce the complexity: ideally, if 
an operation raises an exception, then it has undone any side effects.

Of course it can't undo the launching of an ICBM, for example...

But ideally, if it could, then it should.

If you call the possibly failing operation "A", then that systematic approach 
goes like this: if A fails, then it has cleaned up its own mess, but if A 
succeeds, then it's the responsibility of the calling code to clean up if the 
higher level (multiple statements) operation that A is embedded in, fails.

And that's what Marginean's original C++ ScopeGuard was designed for, and what 
the corresponding Python Cleanup class is designed for.


> Both formulations can be correct (and both work perfectly fine with the 
> chdir() example being used). Sometimes one is better than the other, and 
> sometimes not. You can achieve both ways with either your Cleanup class 
> or with try: finally:.
> 
> I am still of the opinion that Cleanup is not an improvement over try: 
> finally: and has the significant ugliness of forcing cleanup code into 
> callables. This significantly limits what you can do in your cleanup code.

Uhm, not really. :-) As I see it.

But for any given task one should use the most practical tool, and I'm certainly 
not claiming that Cleanup will always be that: it's just another weapon to 
employ in the correctness war  --  although I think it's a powerful one.


Cheers,

- Alf


From clp2 at rebertia.com  Wed Mar  3 20:06:01 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 3 Mar 2010 17:06:01 -0800
Subject: Question about typing: ints/floats
In-Reply-To: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
References: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
Message-ID: <50697b2c1003031706l6043430fv14e72203d7915a4f@mail.gmail.com>

On Wed, Mar 3, 2010 at 3:45 PM, Wells <thewellsoliver at gmail.com> wrote:
> This seems sort of odd to me:
>
>>>> a = 1
>>>> a += 1.202
>>>> a
> 2.202
>
> Indicates that 'a' was an int that was implicitly casted to a float.

Remember Python is dynamically typed. Values have types, but variables
don't (I could do a = "foo" at the end of your code and Python won't
complain).
But yes, internally, Python converted the int to a float before doing
the addition.

> But:
>
>>>> a = 1
>>>> b = 3
>>>> a / b
> 0
>
> This does not implicitly do the casting, it treats 'a' and 'b' as
> integers, and the result as well. Changing 'b' to 3.0 will yield a
> float as a result (0.33333333333333331)

This has been fixed in Python v3.x
You can request the new behavior in earlier versions using a magic import:

>>> from __future__ import division
>>> a = 1
>>> b = 3
>>> a / b
0.33333333333333331

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


From anand.shashwat at gmail.com  Wed Mar  3 20:06:54 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Thu, 4 Mar 2010 06:36:54 +0530
Subject: Question about typing: ints/floats
In-Reply-To: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
References: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
Message-ID: <d4ab53de1003031706k476ae8a4n8e359e47b1dcec7@mail.gmail.com>

yes
you can also try:
>>> float(a)/b
0.33333333333333331


On Thu, Mar 4, 2010 at 5:15 AM, Wells <thewellsoliver at gmail.com> wrote:

> This seems sort of odd to me:
>
> >>> a = 1
> >>> a += 1.202
> >>> a
> 2.202
>
> Indicates that 'a' was an int that was implicitly casted to a float.
> But:
>
> >>> a = 1
> >>> b = 3
> >>> a / b
> 0
>
> This does not implicitly do the casting, it treats 'a' and 'b' as
> integers, and the result as well. Changing 'b' to 3.0 will yield a
> float as a result (0.33333333333333331)
>
> Is there some way to explain the consistency here? Does python
> implicitly change the casting when you add variables of a different
> numeric type?
>
> Anyway, just  curiosity more than anything else. Thanks!
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From benjamin.kaplan at case.edu  Wed Mar  3 20:13:50 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 3 Mar 2010 20:13:50 -0500
Subject: Question about typing: ints/floats
In-Reply-To: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
References: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
Message-ID: <ec96e1391003031713n1b363bb9o2d2d3d2a78cc7bb4@mail.gmail.com>

On Wed, Mar 3, 2010 at 6:45 PM, Wells <thewellsoliver at gmail.com> wrote:

> This seems sort of odd to me:
>
> >>> a = 1
> >>> a += 1.202
> >>> a
> 2.202
>
> Indicates that 'a' was an int that was implicitly casted to a float.
> But:
>
> >>> a = 1
> >>> b = 3
> >>> a / b
> 0
>
> This does not implicitly do the casting, it treats 'a' and 'b' as
> integers, and the result as well. Changing 'b' to 3.0 will yield a
> float as a result (0.33333333333333331)
>
> Is there some way to explain the consistency here? Does python
> implicitly change the casting when you add variables of a different
> numeric type?
>
> Anyway, just  curiosity more than anything else. Thanks!
> --
>

Python doesn't cast anything. Variable names in python do not have types.
It's the objects bound to the names that have types.

a += 1.202 does not change a in place. It is exactly the same thing as
writing
a = a + 1.202

In Python (like many other languages), int + float returns a float. That
float is then assigned to the name "a".

In Python 2, all operations with two int operands return an int, including
division. This was changed in Python 3 so that 1 / 3 will return a float and
1 // 3 will do integer division.


> http://mail.python.org/mailman/listinfo/python-list
>
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From python at mrabarnett.plus.com  Wed Mar  3 20:28:25 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 04 Mar 2010 01:28:25 +0000
Subject: Question about typing: ints/floats
In-Reply-To: <b800048f-b09e-4c39-bf15-9bcd3dae11bc@y11g2000yqh.googlegroups.com>
References: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
	<b800048f-b09e-4c39-bf15-9bcd3dae11bc@y11g2000yqh.googlegroups.com>
Message-ID: <4B8F0CB9.3070708@mrabarnett.plus.com>

Zeeshan Quireshi wrote:
> On Mar 3, 6:45 pm, Wells <thewellsoli... at gmail.com> wrote:
>> This seems sort of odd to me:
>>
>>>>> a = 1
>>>>> a += 1.202
>>>>> a
>> 2.202
>>
>> Indicates that 'a' was an int that was implicitly casted to a float.
>> But:
>>
>>>>> a = 1
>>>>> b = 3
>>>>> a / b
>> 0
>>
>> This does not implicitly do the casting, it treats 'a' and 'b' as
>> integers, and the result as well. Changing 'b' to 3.0 will yield a
>> float as a result (0.33333333333333331)
>>
>> Is there some way to explain the consistency here? Does python
>> implicitly change the casting when you add variables of a different
>> numeric type?
>>
>> Anyway, just  curiosity more than anything else. Thanks!
> 
> Python, like most other languages performs only integer division when
> both the operands are ints. So only if one of the types is a flot or
> you explicitly cast your expression to be a double, then the value
> will be a fraction. otherwise you will the quotient.

int + int gives int
float + float gives float
int + float gives float
float + int gives float

Similarly for '-' and '*'.

Division causes a problem because what is int / int? Should it behave
like the others and give an int? That would mean that 1 / 2 == 0, which
can be confusing for newbies.

In older languages (Fortran, for example) integer divided by integer
using the normal division operator '/' was integer, and this is what C
and those influenced by it do.

Newer languages return a float instead of an integer because it causes
less confusion (1 / 2 == 0.5 is less confusing than 1 / 2 == 0), but
also provide a special integer division operator.

In Python v2.x '/' does integer division, but from Python v3.x '/' does
float division and uses '//' for integer division. ('//' is also
available in later versions of 2.x.)


From chris.lieb at gmail.com  Wed Mar  3 20:33:00 2010
From: chris.lieb at gmail.com (Chris Lieb)
Date: Wed, 3 Mar 2010 17:33:00 -0800 (PST)
Subject: Failure in test_hashlib.py and test_hmac.py
Message-ID: <175865db-f64a-4633-8e36-ab4a5a5eaccf@x22g2000yqx.googlegroups.com>

I am building Python 2.6.4 on a shared server and am encountering test
failures in test_hashlib.py and test_hmac.py, specifically concerning
sha512.  I recompiled Python with --with-pydebug and CLFAGS=CPPFLAGS="-
g" and ran the tests in GDB and got the following results:

----------------------------------------------------------------------------

GNU gdb 6.6.50.20070726-cvs
Copyright (C) 2007 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and
you are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for
details.
This GDB was configured as "x86_64-suse-linux"...
Using host libthread_db library "/lib64/libthread_db.so.1".
(gdb) run test_hashlib.py
Starting program: /export/users1/chris.lieb/packages/python/bin/
python2.6 test_hashlib.py
test_case_md5_0 (__main__.HashLibTestCase) ... ok
test_case_md5_1 (__main__.HashLibTestCase) ... ok
test_case_md5_2 (__main__.HashLibTestCase) ... ok
test_case_md5_huge (__main__.HashLibTestCase) ... ok
test_case_md5_uintmax (__main__.HashLibTestCase) ... ok
test_case_sha1_0 (__main__.HashLibTestCase) ... ok
test_case_sha1_1 (__main__.HashLibTestCase) ... ok
test_case_sha1_2 (__main__.HashLibTestCase) ... ok
test_case_sha1_3 (__main__.HashLibTestCase) ... ok
test_case_sha224_0 (__main__.HashLibTestCase) ... ok
test_case_sha224_1 (__main__.HashLibTestCase) ... ok
test_case_sha224_2 (__main__.HashLibTestCase) ... ok
test_case_sha224_3 (__main__.HashLibTestCase) ... ok
test_case_sha256_0 (__main__.HashLibTestCase) ... ok
test_case_sha256_1 (__main__.HashLibTestCase) ... ok
test_case_sha256_2 (__main__.HashLibTestCase) ... ok
test_case_sha256_3 (__main__.HashLibTestCase) ... ok
test_case_sha384_0 (__main__.HashLibTestCase) ... ok
test_case_sha384_1 (__main__.HashLibTestCase) ... ok
test_case_sha384_2 (__main__.HashLibTestCase) ... ok
test_case_sha384_3 (__main__.HashLibTestCase) ... ok
test_case_sha512_0 (__main__.HashLibTestCase) ... FAIL
test_case_sha512_1 (__main__.HashLibTestCase) ... FAIL
test_case_sha512_2 (__main__.HashLibTestCase) ... FAIL
test_case_sha512_3 (__main__.HashLibTestCase) ... FAIL
test_hexdigest (__main__.HashLibTestCase) ...
Program received signal SIGSEGV, Segmentation fault.
Cannot remove breakpoints because program is no longer writable.
It might be running in another process.
Further execution is probably impossible.
0x00002ba86ffbb463 in ?? ()
(gdb) bt
#0  0x00002ba86ffbb463 in ?? ()
#1  0x000000000046993d in PyString_FromStringAndSize (
    str=0x7fff71c67800 "???\203???5~??????T(P???m\200\a??? ???\005\vW
\025???\203???!???l??????G??????<]
\205                                                    5??????
\203\030???\207~???/c???1???GAz\201???82z???'???>???x???q???\177",
size=1054484473)
    at Objects/stringobject.c:90
#2  0x00002ba87030d59a in ?? ()
#3  0x0000000000000000 in ?? ()

-----------------------------------------------------------------------------------------

GNU gdb 6.6.50.20070726-cvs
Copyright (C) 2007 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and
you are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for
details.
This GDB was configured as "x86_64-suse-linux"...
Using host libthread_db library "/lib64/libthread_db.so.1".
(gdb) run test_hmac.py
Starting program: /export/users1/chris.lieb/packages/python/bin/
python2.6 test_hmac.py
test_legacy_block_size_warnings (__main__.TestVectorsTestCase) ... ok
test_md5_vectors (__main__.TestVectorsTestCase) ... ok
test_sha224_rfc4231 (__main__.TestVectorsTestCase) ... ok
test_sha256_rfc4231 (__main__.TestVectorsTestCase) ... ok
test_sha384_rfc4231 (__main__.TestVectorsTestCase) ... ok
test_sha512_rfc4231 (__main__.TestVectorsTestCase) ...
Program received signal SIGSEGV, Segmentation fault.
Cannot remove breakpoints because program is no longer writable.
It might be running in another process.
Further execution is probably impossible.
0x00002b483844e4c7 in ?? ()
(gdb) bt
#0  0x00002b483844e4c7 in ?? ()
#1  0x000000000046993d in PyString_FromStringAndSize (
    str=0x7ffff84f6730 "\026C3D???\235D\t???\025??????[??????G???
\032bG????????~???\235\t\233aP",
    size=4108309188) at Objects/stringobject.c:90
#2  0x00002b48387e159a in ?? ()
#3  0x0000000000000000 in ?? ()

--------------------------------------------------------------------

In the case of test_hashlib.py, it segfaulted on the first sha512 test
when I didn't have the debugging options enabled.  Only after enabling
debugging did I get FAIL's for the sha512 tests.

Does anyone know what is causing these failures?


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar  3 21:00:02 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 04 Mar 2010 02:00:02 GMT
Subject: Question about typing: ints/floats
References: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
Message-ID: <pan.2010.03.04.02.00.03@REMOVE.THIS.cybersource.com.au>

On Wed, 03 Mar 2010 15:45:51 -0800, Wells wrote:

> But:
> 
>>>> a = 1
>>>> b = 3
>>>> a / b
> 0
> 
> This does not implicitly do the casting, it treats 'a' and 'b' as
> integers, and the result as well. Changing 'b' to 3.0 will yield a float
> as a result (0.33333333333333331)

This is  design flaw in older versions of Python, that the / operator for 
ints performs integer division rather than floating point division.

In Python 2.5 and beyond, you can fix this by calling 

from __future__ import division 


at the top of your module, and then / will perform float division with 
int arguments, and you can use // for integer division.

Or upgrade to Python 3.1, where this is the default behaviour and there 
is no need for the from __future__ call.



-- 
Steven


From debatem1 at gmail.com  Wed Mar  3 21:04:32 2010
From: debatem1 at gmail.com (geremy condra)
Date: Wed, 3 Mar 2010 21:04:32 -0500
Subject: Passing FILE * types using ctypes
In-Reply-To: <a83319d7-c199-4532-9816-d002f7fd7914@q16g2000yqq.googlegroups.com>
References: <a83319d7-c199-4532-9816-d002f7fd7914@q16g2000yqq.googlegroups.com>
Message-ID: <f3cc57c61003031804t5b2ef682j154caeec0f16dafb@mail.gmail.com>

On Wed, Mar 3, 2010 at 6:50 PM, Zeeshan Quireshi
<zeeshan.quireshi at gmail.com> wrote:
> Hello, I'm using ctypes to wrap a library i wrote. I am trying to pass
> it a FILE *pointer, how do i open a file in Python and convert it to a
> FILE *pointer. Or do i have to call the C library using ctypes first,
> get the pointer and then pass it to my function.

Something along these lines should work:

class FILE(ctypes.structure):
    pass

FILE_p = ctypes.POINTER(FILE)

...but I haven't tested it.

You can also use a c_void_p.

> Also, is there any automated way to convert c struct and enum
> definitions to ctypes data types.

for structures:
http://code.activestate.com/recipes/576734-c-struct-decorator/?in=user-4170000

for functions:
http://code.activestate.com/recipes/576731-c-function-decorator/?in=user-4170000

Geremy Condra


From john at castleamber.com  Wed Mar  3 21:11:25 2010
From: john at castleamber.com (John Bokma)
Date: Wed, 03 Mar 2010 20:11:25 -0600
Subject: Working group for Python CPAN-equivalence?
References: <mailman.179.1267620332.23598.python-list@python.org>
	<87r5o1v8vp.fsf@benfinney.id.au>
	<4b8e929d$0$1585$742ec2ed@news.sonic.net>
	<hmmiks$1ru$1@dough.gmane.org>
	<6cc20cea1003031417i15b66bcdi454bba5a9c642d95@mail.gmail.com>
	<mailman.261.1267659815.23598.python-list@python.org>
Message-ID: <871vg0bzua.fsf@castleamber.com>

Philip Semanchuk <philip at semanchuk.com> writes:

> Do Fedora & Ubuntu's package managers offer modules that appear in
> CPAN?

Yes, I've installed so far all Perl modules I need that way (sudo
apt-get install ...)

> In other words, if I was a Perl user under Ubuntu would I use
> the pkg manager to add a Perl module, or CPAN, or would both work?

Both would work, but I would make very sure to use a separate
installation directory for modules installed via CPAN.

AFAIK there are also programs that pack CPAN modules/bundles into
something the package manager can use to install.

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar  3 21:14:18 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 04 Mar 2010 02:14:18 GMT
Subject: Generic singleton
References: <mailman.222.1267642515.23598.python-list@python.org>
Message-ID: <pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>

On Wed, 03 Mar 2010 19:54:52 +0100, mk wrote:

> Hello,
> 
> So I set out to write generic singleton, i.e. the one that would do a
> singleton with attributes of specified class. At first:

Groan. What is it with the Singleton design pattern? It is one of the 
least useful design patterns, and yet it's *everywhere* in Java and C++ 
world.

I suspect because it allows people to have all the bugs and difficulties 
of global variables, while still pretending to be virtuous for not using 
global variables. But maybe I'm cynical...

There are a ton of recipes out there for Python Singletons. Don't forget 
to check out the Borg pattern, which gives more or less the same effect 
using a radically different approach.

Then, my advice is to forget all about them. In my experience, I have 
never needed to code my own Singleton class in anything except toy 
examples. YMMV.


> print id(s1) == id(s2)

Or, more concisely:

s1 is s2




> class Singleton(object):
> 
>      instd = {}
> 
>      def __new__(cls, impclass, *args, **kwargs):
>          impid = id(impclass)

Yuck. Why are you using the id of the class as the key, instead of the 
class itself?


class Singleton(object):
    instd = {}
    def __new__(cls, impclass, *args, **kwargs):
        if not impclass in cls.instd:
            cls.instd[impclass] = impclass.__new__(
                impclass, *args, **kwargs)
         return cls.instd[impclass]


> Questions:
> 
> 1. Is this safe? That is, does every builtin class have unique id? I
> have found this in docs:

Why are you limiting yourself to builtin classes?

ALL objects, whether classes or builtins or strings or ints or instances 
of a class you built yourself, have a unique id that lasts for the 
lifespan of the object. But that is certainly not what you care about.


-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar  3 21:18:23 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 04 Mar 2010 02:18:23 GMT
Subject: Question about typing: ints/floats
References: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
	<mailman.263.1267664764.23598.python-list@python.org>
Message-ID: <pan.2010.03.04.02.18.22@REMOVE.THIS.cybersource.com.au>

On Wed, 03 Mar 2010 17:06:01 -0800, Chris Rebert wrote:

> But yes, internally, Python converted the int to a float before doing
> the addition.


[pedantic]
To be precise, Python created a *new* float from the int, leaving the 
original int alone. Because ints and floats are objects, if Python 
actually converted the int to a float, this would happen:


>>> n = 1
>>> m = n
>>> x = 2.0 + n
>>> print x
3.0
>>> print n
1.0
>>> "abc"[m]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: string indices must be integers

and the world would rapidly be destroyed. Fortunately this does not 
happen.
[/pedantic]




-- 
Steven


From cournape at gmail.com  Wed Mar  3 21:24:24 2010
From: cournape at gmail.com (David Cournapeau)
Date: Thu, 4 Mar 2010 11:24:24 +0900
Subject: PYTHONPATH and eggs
In-Reply-To: <86ee3b75-b3f5-4172-90c8-e90f0e50b89f@a18g2000yqc.googlegroups.com>
References: <86ee3b75-b3f5-4172-90c8-e90f0e50b89f@a18g2000yqc.googlegroups.com>
Message-ID: <5b8d13221003031824g6e26c9bbsc5a5fd52bbcd323e@mail.gmail.com>

On Wed, Mar 3, 2010 at 7:14 PM, geoffbache <geoff.bache at jeppesen.com> wrote:

> Unfortunately, the location from PYTHONPATH ends up after the eggs in
> sys.path so I can't persuade Python to import my version. The only way
> I've found to fix it is to copy the main script and manually hack
> sys.path at the start of it which isn't really very nice. I wonder if
> there is any better way as I can't be the first person to want to do
> this, surely?

One way is to never install things as eggs: I have a script
hard_install which forces things to always install with
--single-externally-managed blablabla. This has worked very well for
me, but may not always be applicable (in particular if you are on a
platform where building things from sources is difficult).

cheers,

David


From roy at panix.com  Wed Mar  3 21:28:03 2010
From: roy at panix.com (Roy Smith)
Date: Wed, 03 Mar 2010 21:28:03 -0500
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<eq4l57-okf2.ln1@ozzie.tundraware.com>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <7uu1ooFiipU1@mid.individual.net>
	<4B89D8BE.2040905@mrabarnett.plus.com> <4B8B9845.70604@sequans.com>
	<mailman.59.1267456634.23598.python-list@python.org>
	<7v695nFa0fU1@mid.individual.net>
	<4B8E7538.2080003@mrabarnett.plus.com>
	<mailman.201.1267632673.23598.python-list@python.org>
Message-ID: <roy-BD14BA.21280303032010@news.panix.com>

In article <mailman.201.1267632673.23598.python-list at python.org>,
 "D'Arcy J.M. Cain" <darcy at druid.net> wrote:

> On Wed, 03 Mar 2010 14:42:00 +0000
> MRAB <python at mrabarnett.plus.com> wrote:
> > Gregory Ewing wrote:
> > Mk14 from Science of Cambridge, a kit with hex keypad and 7-segment
> > display, which I had to solder together, and also make my own power
> > supply. I had the extra RAM and the I/O chip, so that's 256B (including
> > the memory used by the monitor) + 256B additional RAM + 128B more in the
> > I/O chip.
> 
> In case some of you youngsters think that there is a typo in the above,
> no, he means a total of 640 bytes.  In today's terms that would be
> approx 0.0000006GB.

640 bytes!  Man, did you have it easy.  When I was a kid, we had to walk 10 
miles uphill to school in the snow, oh, wait, wrong story.  When I was a 
kid, we had a D2 kit (http://tinyurl.com/yfgyq4u).  We had 256 bytes of 
RAM.  And we thought we were lucky!  Some of the other kids, if they wanted 
to store a number, they had to scratch the bits into stone tablets with 
their bare hands...

When's the last time you had a computer where the instruction manual warned 
you against wearing silk or nylon clothing?


From srikrishnamohan at gmail.com  Wed Mar  3 21:30:21 2010
From: srikrishnamohan at gmail.com (km)
Date: Thu, 4 Mar 2010 11:30:21 +0900
Subject: NoSQL Movement?
In-Reply-To: <BABjn.11012$pv.4575@news-server.bigpond.net.au>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<mailman.256.1267655008.23598.python-list@python.org>
	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
Message-ID: <f4cc03641003031830o60c5dc09pb077bebedc02d231@mail.gmail.com>

Hi,

this would be a good place to start
http://en.wikipedia.org/wiki/NoSQL
http://nosql-database.org/

HTH,
Krishna

On Thu, Mar 4, 2010 at 7:41 AM, Avid Fan <me at privacy.net> wrote:

> Jonathan Gardner wrote:
>
>
>> I see it as a sign of maturity with sufficiently scaled software that
>> they no longer use an SQL database to manage their data. At some point
>> in the project's lifetime, the data is understood well enough that the
>> general nature of the SQL database is unnecessary.
>>
>>
> I am really struggling to understand this concept.
>
> Is it the normalised table structure that is in question or the query
> language?
>
> Could you give some sort of example of where SQL would not be the way to
> go.   The only things I can think of a simple flat file databases.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
-------------- next part --------------
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From falk at mauve.rahul.net  Wed Mar  3 21:50:23 2010
From: falk at mauve.rahul.net (Edward A. Falk)
Date: Thu, 4 Mar 2010 02:50:23 +0000 (UTC)
Subject: DOS Follies (Was: Docstrings...)
References: <20100303114603.7021e9ba.darcy@druid.net>
	<539252.91463.qm@web58904.mail.re1.yahoo.com>
	<hmme68$glb$1@dough.gmane.org>
	<mailman.248.1267652136.23598.python-list@python.org>
Message-ID: <hmn75f$vi1$1@blue.rahul.net>

In article <mailman.248.1267652136.23598.python-list at python.org>,
D'Arcy J.M. Cain <darcy at druid.net> wrote:
>On Wed, 03 Mar 2010 20:44:08 +0100
>mk <mrkafk at gmail.com> wrote:
>> It reminds me of why Windows uses backslashes for path separation 
>> instead of slashes: what I've *heard*, and do not know if it's true, 
>> it's because Gates fancied using / for options switch instead of -, and 
>> to hell with established practice.
>
>That was because CP/M used slashes for options and DOS copied that.  By
>the time hierarchy was added it was too late to change.

And CP/M got it from the various PDP-11 operating systems.  I *think*
that Tops-10 had it as well.  In fact, I think using / to delimit
commandline options goes back to the PDP-8.

-- 
	-Ed Falk, falk at despams.r.us.com
	http://thespamdiaries.blogspot.com/


From philip at semanchuk.com  Wed Mar  3 21:53:19 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Wed, 3 Mar 2010 21:53:19 -0500
Subject: NoSQL Movement?
In-Reply-To: <BABjn.11012$pv.4575@news-server.bigpond.net.au>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<mailman.256.1267655008.23598.python-list@python.org>
	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
Message-ID: <161DBC13-9917-47E4-99FA-0D04AFC7DC44@semanchuk.com>


On Mar 3, 2010, at 5:41 PM, Avid Fan wrote:

> Jonathan Gardner wrote:
>
>> I see it as a sign of maturity with sufficiently scaled software that
>> they no longer use an SQL database to manage their data. At some  
>> point
>> in the project's lifetime, the data is understood well enough that  
>> the
>> general nature of the SQL database is unnecessary.
>
> I am really struggling to understand this concept.
>
> Is it the normalised table structure that is in question or the  
> query language?
>
> Could you give some sort of example of where SQL would not be the  
> way to go.   The only things I can think of a simple flat file  
> databases.

Well, Zope is backed by an object database rather than a relational one.





From jackdied at gmail.com  Wed Mar  3 22:43:01 2010
From: jackdied at gmail.com (Jack Diederich)
Date: Wed, 3 Mar 2010 22:43:01 -0500
Subject: NoSQL Movement?
In-Reply-To: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
Message-ID: <b8e622741003031943n1b71d89ct1a3ded4c3699d0c0@mail.gmail.com>

On Wed, Mar 3, 2010 at 12:36 PM, Xah Lee <xahlee at gmail.com> wrote:
[snip]

Xah Lee is a longstanding usenet troll.  Don't feed the trolls.


From jackdied at gmail.com  Wed Mar  3 22:59:55 2010
From: jackdied at gmail.com (Jack Diederich)
Date: Wed, 3 Mar 2010 22:59:55 -0500
Subject: Generic singleton
In-Reply-To: <6cc20cea1003031418w5ad6f59ah91562243a2cc4afb@mail.gmail.com>
References: <mailman.222.1267642515.23598.python-list@python.org>
	<m2iq9d197a.fsf@googlemail.com> <hmmjad$4gm$1@dough.gmane.org>
	<6cc20cea1003031418w5ad6f59ah91562243a2cc4afb@mail.gmail.com>
Message-ID: <b8e622741003031959o5dbf070dta948f1a4202d92b@mail.gmail.com>

On Wed, Mar 3, 2010 at 5:18 PM, Jonathan Gardner
<jgardner at jonathangardner.net> wrote:
> On Wed, Mar 3, 2010 at 1:11 PM, mk <mrkafk at gmail.com> wrote:
>>
>> Or I could make my life simpler and use global variable. :-)
>>
>
> Ding ding ding!
>
> 90% of Design Patterns is making Java suck less.
>
> Other languages don't necessarily suffer from Java's design flaws.

The original "Gang of Four" book was about C++ and not Java.  The fact
that you can casually assert that "Design Patterns" are about Java
says something not entirely kosher about Java ;)

-Jack


From blueskykind02 at gmail.com  Thu Mar  4 00:23:10 2010
From: blueskykind02 at gmail.com (yamamoto)
Date: Wed, 3 Mar 2010 21:23:10 -0800 (PST)
Subject: python SUDS library
Message-ID: <28ed0127-8b71-4327-954c-c9100b4768de@v20g2000prb.googlegroups.com>

Hi,
I tried to make a simple script with SUD library for caching torrent
files. it doenst work!

[versions]
suds: 0.4, python: 2.6.4

[code]
from suds.client import Client
import base64

path = 'sample.torrent'
doc = open(path, 'rb').read()
encoded_doc = base64.b64encode(doc)
url = 'http://torrage.com/api/torrage.wsdl'
client = Client(url, cache=None)
print client
hash = client.service.cacheTorrent(encoded_doc)
print hash

[result]

Suds ( https://fedorahosted.org/suds/ )  version: 0.4 (beta)  build:
R663-20100303

Service ( CacheService ) tns="urn:Torrage"
   Prefixes (0)
   Ports (1):
      (CachePort)
         Methods (1):
            cacheTorrent(xs:string torrent, )
         Types (0):

Traceback (most recent call last):
  File "C:\Documents and Settings\yamamoto\workspace\python\console
\extract.py", line 13, in <module>
    result = client.service.cacheTorrent(encoded_doc)
  File "C:\Python26\lib\site-packages\suds\client.py", line 539, in
__call__
    return client.invoke(args, kwargs)
  File "C:\Python26\lib\site-packages\suds\client.py", line 598, in
invoke
    result = self.send(msg)
  File "C:\Python26\lib\site-packages\suds\client.py", line 627, in
send
    result = self.succeeded(binding, reply.message)
  File "C:\Python26\lib\site-packages\suds\client.py", line 659, in
succeeded
    r, p = binding.get_reply(self.method, reply)
  File "C:\Python26\lib\site-packages\suds\bindings\binding.py", line
143, in get_reply
    replyroot = sax.parse(string=reply)
  File "C:\Python26\lib\site-packages\suds\sax\parser.py", line 136,
in parse
    sax.parse(source)
  File "C:\Python26\lib\xml\sax\expatreader.py", line 107, in parse
    xmlreader.IncrementalParser.parse(self, source)
  File "C:\Python26\lib\xml\sax\xmlreader.py", line 123, in parse
    self.feed(buffer)
  File "C:\Python26\lib\xml\sax\expatreader.py", line 211, in feed
    self._err_handler.fatalError(exc)
  File "C:\Python26\lib\xml\sax\handler.py", line 38, in fatalError
    raise exception
xml.sax._exceptions.SAXParseException: <unknown>:2:0: junk after
document element


this is a php code provided by torrage
<?
        $client = new SoapClient("http://torrage.com/api/
torrage.wsdl");
        $infoHash = $client-
>cacheTorrent(base64_encode(file_get_contents("my.torrent")));
?>

any suggestions?
thanks in advance



From waldemar.osuch at gmail.com  Thu Mar  4 00:25:29 2010
From: waldemar.osuch at gmail.com (Waldemar Osuch)
Date: Wed, 3 Mar 2010 21:25:29 -0800 (PST)
Subject: SOAP 1.2 Python client ?
References: <5a36bd30-6cbd-48ca-9ca3-dc34c97e03c0@o30g2000yqb.googlegroups.com>
Message-ID: <f075993f-5536-465d-8399-a9011a63800f@e36g2000yqc.googlegroups.com>

On Mar 3, 9:32?am, BlueBird <p... at freehackers.org> wrote:
> Hi,
>
> I am looking for a SOAP 1.2 python client. To my surprise, it seems
> that this does not exist. Does anybody know about this ?
>
> The following clients seem to be both unmaintained and still
> supporting only SOAP 1.1 :
>
> - SUDS
suds unmaintained? I beg to differ.

> - zsi
> - SOAPy
>
> cheers,
>
> Philippe



From geoff.bache at jeppesen.com  Thu Mar  4 03:20:57 2010
From: geoff.bache at jeppesen.com (geoffbache)
Date: Thu, 4 Mar 2010 00:20:57 -0800 (PST)
Subject: PYTHONPATH and eggs
References: <86ee3b75-b3f5-4172-90c8-e90f0e50b89f@a18g2000yqc.googlegroups.com>
	<mailman.268.1267669467.23598.python-list@python.org>
Message-ID: <f2f1cdd5-3022-40e8-b186-9712c5587670@19g2000yqu.googlegroups.com>


On Mar 4, 3:24?am, David Cournapeau <courn... at gmail.com> wrote:
> On Wed, Mar 3, 2010 at 7:14 PM, geoffbache <geoff.ba... at jeppesen.com> wrote:
> > Unfortunately, the location from PYTHONPATH ends up after the eggs in
> > sys.path so I can't persuade Python to import my version. The only way
> > I've found to fix it is to copy the main script and manually hack
> > sys.path at the start of it which isn't really very nice. I wonder if
> > there is any better way as I can't be the first person to want to do
> > this, surely?
>
> One way is to never install things as eggs: I have a script
> hard_install which forces things to always install with
> --single-externally-managed blablabla. This has worked very well for
> me, but may not always be applicable (in particular if you are on a
> platform where building things from sources is difficult).

Thanks for the tips. Is your script generic at all? I wonder if you'd
be prepared to share it?

Figuring out virtualenv would also be an option, as would figuring out
how to build my own egg, but both these solutions feel like overkill
to me just to enable a small bit of tweaking.

/Geoff


From asimurzin at gmail.com  Thu Mar  4 03:25:21 2010
From: asimurzin at gmail.com (=?UTF-8?B?0JDQvdC00YDQtdC5INCh0LjQvNGD0YDQt9C40L0=?=)
Date: Thu, 4 Mar 2010 00:25:21 -0800 (PST)
Subject: Don't work __getattr__ with __add__
Message-ID: <e5f2faf6-7aa1-40d2-90d1-a2048f15de2e@b7g2000yqd.googlegroups.com>

It is object of the class A, in conteiner's class tmpA. Not all method
from A are in the tmpA. So for exapmle:
A + B -- yes , tmpA + B no. I try to call method from A for tmpA. I
can to call simple method,  such as change(), bit __add__ -  don't
work. If to remove inheritance from object, the code work's. Help me,
please
#--------------------------------------
class A(object):
    def __init__( self, x, y ):
        self.x = x
        self.y = y
        pass
#-------
    def __add__( self, arg ):
       tmp1 = self.x + arg.x
       tmp2 = self.y + arg.y
       return tmpA( A( tmp1, tmp2 ) )

    def change( self, x, y ):
        self.x = x
        self.y = y
        pass
    pass
#------------------------------------------
class tmpA( object ):
    def __init__( self, theA ):
        self.A = theA
        pass
#-------
    def __call__( self ):
        return self.A
#-------
    def __coerce__( self, *args ):
        return None
#-------
    def __getattr__( self, *args ):
        name = args[ 0 ]
        try:
            attr = None
            exec "attr = self.__call__().%s" % name
            return attr
        except :
            raise AttributeError
#--------------------------------------
class B( object ):
    def __init__( self, x, y):
        self.x = x
        self.y = y
        pass
#-------------------------------------
a=A( 1,2 )
b=B( 3,4 )
tmp_a = a + b  #well
tmp_a.change( 0, 0 ) # very well !!!
v = tmp_a + b  #TypeError: "unsupported operand type(s) for +: 'tmpA'
and 'B'"


From clp2 at rebertia.com  Thu Mar  4 03:38:58 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 4 Mar 2010 00:38:58 -0800
Subject: Don't work __getattr__ with __add__
In-Reply-To: <e5f2faf6-7aa1-40d2-90d1-a2048f15de2e@b7g2000yqd.googlegroups.com>
References: <e5f2faf6-7aa1-40d2-90d1-a2048f15de2e@b7g2000yqd.googlegroups.com>
Message-ID: <50697b2c1003040038l2d778448i7667d9b75a691dd@mail.gmail.com>

On Thu, Mar 4, 2010 at 12:25 AM, ?????? ???????? <asimurzin at gmail.com> wrote:
> It is object of the class A, in conteiner's class tmpA. Not all method
> from A are in the tmpA. So for exapmle:
> A + B -- yes , tmpA + B no. I try to call method from A for tmpA. I
> can to call simple method, ?such as change(), bit __add__ - ?don't
> work. If to remove inheritance from object, the code work's. Help me,
> please

Some clarity has been lost in translation, but I think I get what you're saying.
__add__ and the other double-underscore special methods are not looked
up using __getattr__ or __getattribute__, hence trying to do addition
on tmpA, which does not define an __add__ method, fails.

For a full explanation, read:
http://docs.python.org/reference/datamodel.html#special-method-lookup-for-new-style-classes

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


From no.email at nospam.invalid  Thu Mar  4 03:52:03 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Thu, 04 Mar 2010 00:52:03 -0800
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org>
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
	<mailman.199.1267631220.23598.python-list@python.org>
Message-ID: <7xlje8lb9o.fsf@ruckus.brouhaha.com>

mk <mrkafk at gmail.com> writes:
> OK, but how? How would you make up e.g. for JSON's lack of comments?

Modify the JSON standard so that "JSON 2.0" allows comments.

> OTOH, if YAML produces net benefit for as few as, say, 200 people in
> real world, the effort to make it has been well worth it.

Not if 200,000 other people have to deal with it but don't receive the
benefit.

> http://myarch.com/why-xml-is-bad-for-humans
> http://www.ibm.com/developerworks/xml/library/x-sbxml.html

You might like this one too:

  http://www.schnada.de/grapt/eriknaggum-xmlrant.html
>
> I also have to maintain a few applications that internally use XML as
> data format: while they are tolerable, they still leave smth to be
> desired, as those applications are really slow for larger datasets,

I thought we were talking about configuration files, not "larger datasets".

> There are demonstrable benefits to this too: I for one am happy that
> ReST is available for me and I don't have to learn a behemoth such as
> DocBook to write documentation.

DocBook is so far off my radar I'd have never thought of it.  I just now
learned that it's not Windows-only.  There is already POD, Pydoc,
Texinfo, a billion or so flavors of wiki markup, vanilla LaTeX, and most
straightforwardly of all, plain old ascii.  ReST was another solution in
search of a problem.


From asimurzin at gmail.com  Thu Mar  4 03:54:13 2010
From: asimurzin at gmail.com (Andrey Simurzin)
Date: Thu, 4 Mar 2010 00:54:13 -0800 (PST)
Subject: Don't work __getattr__ with __add__
References: <e5f2faf6-7aa1-40d2-90d1-a2048f15de2e@b7g2000yqd.googlegroups.com>
	<mailman.275.1267691940.23598.python-list@python.org>
Message-ID: <a5a39d5a-5bff-406d-8ac1-836e0d368c17@z11g2000yqz.googlegroups.com>

On 4 ???, 11:38, Chris Rebert <c... at rebertia.com> wrote:
> On Thu, Mar 4, 2010 at 12:25 AM, ?????? ???????? <asimur... at gmail.com> wrote:
> > It is object of the class A, in conteiner's class tmpA. Not all method
> > from A are in the tmpA. So for exapmle:
> > A + B -- yes , tmpA + B no. I try to call method from A for tmpA. I
> > can to call simple method, ?such as change(), bit __add__ - ?don't
> > work. If to remove inheritance from object, the code work's. Help me,
> > please
>
> Some clarity has been lost in translation, but I think I get what you're saying.
> __add__ and the other double-underscore special methods are not looked
> up using __getattr__ or __getattribute__, hence trying to do addition
> on tmpA, which does not define an __add__ method, fails.
>
> For a full explanation, read:http://docs.python.org/reference/datamodel.html#special-method-lookup...
>
> Cheers,
> Chris
> --http://blog.rebertia.com

Thank you very much


From greg.ewing at canterbury.ac.nz  Thu Mar  4 05:01:06 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Thu, 04 Mar 2010 23:01:06 +1300
Subject: My four-yorkshireprogrammers contribution
In-Reply-To: <mailman.189.1267627321.23598.python-list@python.org>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>	<4B8B9845.70604@sequans.com>	<mailman.59.1267456634.23598.python-list@python.org>	<7v695nFa0fU1@mid.individual.net>
	<mailman.189.1267627321.23598.python-list@python.org>
Message-ID: <7v9e3rFl7mU1@mid.individual.net>

MRAB wrote:

> Mk14 from Science of Cambridge, a kit with hex keypad and 7-segment
> display, which I had to solder together, and also make my own power
> supply. I had the extra RAM and the I/O chip, so that's 256B (including
> the memory used by the monitor) + 256B additional RAM + 128B more in the
> I/O chip.

Luxury! Mine was a Miniscamp, based on a design published in
Electronics Australia in the 70s. 256 bytes RAM, 8 switches
for input, 8 LEDs for output. No ROM -- program had to be
toggled in each time.

Looked something like this:

   http://oldcomputermuseum.com/mini_scamp.html

except that mine wasn't built from a kit and didn't look
quite as professional as that one.

It got expanded in various ways, of course ("hacked" would
be a more accurate word). Memory expanded to 1.5KB, hex keyboard
and display (built into an old calculator case), cassette tape
interface based on a circuit scrounged from another magazine
article (never quite got it to work properly, wouldn't go at
more than about 4 bytes/sec, probably because I used resistors
and capacitors salvaged from old TV sets). Still no ROM, though.
Had to toggle in a bootstrap to load the keyboard/display
monitor (256 bytes) from tape.

Somewhere along the way I replaced the CPU with a 6800 -
much nicer instruction set! (Note for newtimers -- that's
*two* zeroes, not three.)

During that period, my holy grail was alphanumeric I/O. I was
envious of people who wrote articles about hooking surplus
teleprinters, paper tape equipment and other such cool
hardware to their homebrew micros -- sadly, no such thing was
available in NZ.

Then one day a breakthrough came -- a relative who worked
in the telephone business (government-owned in NZ at the time)
managed to get me an old teleprinter. It was Baudot, not ASCII,
which meant uppercase only, not much punctuation, and an
annoyingly stateful protocol involving letters/figures shift
characters, but it was heaps better than nothing. A bit of
hackery, of both hardware and software varieties, and I got
it working. It was as noisy as hell, but I could input and
output ACTUAL LETTERS! It was AMAZING!

As a proof of concept, I wrote an extremely small BASIC
interpreter that used one-character keywords. The amount of
room left over for a program was even smaller, making it
completely useless. But it worked, and I had fun writing it.

One thing I never really got a grip on with that computer
was a decent means of program storage. Towards the end of it's
life, I was experimenting with trying to turn an old 8-track
cartridge player into a random access block storage device,
using a tape loop. I actually got it to work, more or less,
and wrote a small "TOS" (Tape Operating System) for it that
could store and retrieve files. But it was never reliable
enough to be practical.

By that stage, umpteen layers of hackery using extremely
dubious construction techniques had turned the machine into
something of a Frankenstein monster. Calling it a bird's nest
would have been an insult to most birds. I wish I'd taken
some photos, they would have been good for scaring potential
future grandchildren.

My next computer was a Dick Smith Super 80 (*not* System 80,
which would have been a much better machine), Z80-based, built
from a kit. I had a lot of fun hacking around with that, too...
but that's another story!

-- 
Greg


From greg.ewing at canterbury.ac.nz  Thu Mar  4 05:05:10 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Thu, 04 Mar 2010 23:05:10 +1300
Subject: Docstrings considered too complicated
In-Reply-To: <mailman.208.1267634665.23598.python-list@python.org>
References: <20100224212303.242222c6@geekmail.INVALID>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>
	<kyoevn.k63@spenarnc.xs4all.nl>	<hmk60h$nce$1@reader1.panix.com>
	<7v69rcFcmeU1@mid.individual.net>	<hmltsi$jcd$1@reader1.panix.com>
	<mailman.208.1267634665.23598.python-list@python.org>
Message-ID: <7v9ebdFmfiU1@mid.individual.net>

D'Arcy J.M. Cain wrote:

> And that is why text files in MS-DOS and CP/M before it end with ^Z.
> They needed a way to tell where the end of the information was.  Why
> they used ^Z (SUB - Substitute) instead of ^C (ETX - End of TeXt) or
> even ^D (EOT - End Of Transmission) is anyone's guess.

Well, ^C is what people used for interrupting their BASIC
programs. And ^D would have made it almost compatible with
unix, which would have been far too sensible!

My guess is that it was chosen for its mnemonic value --
end of alphabet, end of file.

Also remember there were programs like Wordstar that used
control key combinations for all manner of things. It might
have been the only key left on the keyboard that wasn't
used for anything else.

-- 
Greg


From greg.ewing at canterbury.ac.nz  Thu Mar  4 05:09:01 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Thu, 04 Mar 2010 23:09:01 +1300
Subject: Docstrings considered too complicated
In-Reply-To: <hmm9pi$num$1@south.jnrs.ja.net>
References: <mailman.215.1267639293.23598.python-list@python.org>
	<hmm9pi$num$1@south.jnrs.ja.net>
Message-ID: <7v9eimFnnoU1@mid.individual.net>

Richard Brodie wrote:

> It goes back to ancient PDP operating systems, so may well
> predate Unix, depending which exact OS was the first to use it.

Yes, I think it was used in RT-11, which also had
block-oriented disk files.

There were two kinds of devices in RT-11, character
and block, and the APIs for dealing with them were
quite different. They hadn't fully got their heads
around the concept of "device independent I/O" in
those days, although they were trying.

-- 
Greg


From spamfresser at ch3ka.de  Thu Mar  4 05:09:06 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Thu, 04 Mar 2010 11:09:06 +0100
Subject: case do problem
In-Reply-To: <4b8e9e8b$0$1121$4fafbaef@reader3.news.tin.it>
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>	<hml77p$k1v$00$1@news.t-online.com>
	<4b8e9e8b$0$1121$4fafbaef@reader3.news.tin.it>
Message-ID: <hmo0s8$9fn$1@news.urz.uni-heidelberg.de>

Am 03.03.2010 18:38, schrieb Tracubik:
> Il Wed, 03 Mar 2010 09:39:54 +0100, Peter Otten ha scritto:

>> def loop():
>>      count = 0
>>      m = 0
>>      lookup = {1: 1, 2: 10, 3: 100}
>>      for iterations in range(20): # off by one
>>          # ...
>>          print "%2d %1d %3d" % (iterations, count, m) # ...
>>          if generic_condition():
>>              count += 1
>>          # ...
>>          m = lookup.get(count, m)
>>          if count == 4:
>>              break
>>
>> if __name__ == "__main__":
>>      loop()
>>      print "That's all, folks"
>>
>> Something must be wrong with me today because I find the Pascal code
>> /more/ readable..
>
> i was think the same, Pascal seem to generate a great more readable code.
> I'm a newbie, so my opinion is probably wrong, but i still think that
> don't have CASE OF and REPEAT UNTIL code block return in difficult-to-
> read code.

That is probably a side-effect of literal code translation.

No one would write something like you did when he writes in python the 
first place.


 >> Tracubik wrote:
 >>
 >>> hi, i've to convert from Pascal this code:
 >>
 >> program loop;
 >>
 >> function generic_condition: boolean;
 >> begin
 >>     generic_condition := random>  0.7
 >> end;
 >>
 >> procedure loop;
 >> var
 >>     iterations, count, m: integer;
 >> begin
 >>     iterations := 0;
 >>     count := 0;
 >>     m := 0;
 >>     repeat
 >>        iterations := iterations+1;
 >>        (*...*)
 >>        writeln(iterations:2, count:2, m:4);
 >>        (*...*)
 >>        if generic_condition then
 >> 	    inc(count);
 >>        (*...*)
 >>        case count of
 >> 	1: m := 1;
 >> 	2: m := 10;
 >> 	3: m := 100
 >>        end
 >>     until (count = 4) or (iterations = 20)
 >> end;
 >>
 >> begin
 >>     loop;
 >>     writeln("That's all, folks")
 >> end.

Hmmm lets see...
We have somewhat obscure and complicated logic.

If we cannot get rid of it, lets hide it:

class Loop:
     def __init__(self, maxiterations=0, maxcount=1, m=0):
         assert generic_condition.__call__
         self.maxiterations = maxiterations
         self.maxcount = maxcount
         self.m=m
         self.count=0
         self.iterations=0

     def __iter__(self):
         while True:
             yield self.next()

     def next(self):
         self.iterations+=1
         if self.iterations > self.maxiterations:
             raise StopIteration
         if generic_condition():
             self.count += 1
             if self.count >= self.maxcount:
                 raise StopIteration
             self.m = (None,1,10,100)[self.count]
         return self, self.m

##### So we have:

#from complicatedlogic import Loop
from random import random

def generic_condition():
     return random() > 0.7

if __name__ == '__main__':
     for loop, m in Loop(maxiterations=20, maxcount=4):
         print("%2d %1d %3d" % (loop.iterations, loop.count, m))
     print("That's all, folks")


better? worse? I honestly do not know.

Note that while this is valid py3 and runs as intended, there might be 
some off-by-one or something left.

Also, this is of course not production level code ;)

Regards,
Michael


From greg.ewing at canterbury.ac.nz  Thu Mar  4 05:15:23 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Thu, 04 Mar 2010 23:15:23 +1300
Subject: Docstrings considered too complicated
In-Reply-To: <mailman.228.1267645124.23598.python-list@python.org>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>	<4B8B9845.70604@sequans.com>	<mailman.59.1267456634.23598.python-list@python.org>	<7v695nFa0fU1@mid.individual.net>	<4B8E7538.2080003@mrabarnett.plus.com>	<20100303111248.7f40d659.darcy@druid.net>	<hmm7l9$m4f$1@dough.gmane.org>
	<mailman.228.1267645124.23598.python-list@python.org>
Message-ID: <7v9eukFpu2U1@mid.individual.net>

Steve Holden wrote:

> Puts me in mind of Mario Wolczko's early attempts to implement SmallTalk
> on a VAX 11/750. The only bitmapped display we had available was a Three
> Rivers PERQ, connected by a 9600bps serial line. We left it running at
> seven o'clock one evening, and by nine am the next day it had brought up
> about two thirds of the initial VM loader screen ...

A couple of my contemporary postgraduate students worked on
getting Smalltalk to run on an Apple Lisa. Their first attempt
at a VM implementation was written in Pascal, and it wasn't
very efficient. I remember walking into their room one day
and seeing one of them sitting there watching it boot, drawing
stuff on the screen  v...e...r...y...   s...l...o...w...l...y...

At least their display was wired directly to the machine
running the code. I hate to think what bitmapped graphics at
9600 baud would be like!

-- 
Greg


From nanyaks at googlemail.com  Thu Mar  4 05:30:15 2010
From: nanyaks at googlemail.com (simn_stv)
Date: Thu, 4 Mar 2010 02:30:15 -0800 (PST)
Subject: taking python enterprise level?...
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com> 
	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com> 
	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com> 
	<20100302015813.5397655e.darcy@druid.net>
	<hmm2jc$28u$1@dough.gmane.org> 
	<973824D8-3020-44A8-B2DA-501FF530457B@semanchuk.com>
	<hmmih7$1bs$1@dough.gmane.org> 
	<mailman.257.1267656040.23598.python-list@python.org>
Message-ID: <81d62813-c768-4f9e-aa50-d6d007a9b1e6@19g2000yqu.googlegroups.com>

till i think i absolutely need to trade-off easier and less
complicated code, better db structure (from a relational perspective)
and generally less "head aches" for speed, i think i'll stick with the
joins for now!...;)

the thought of denormalization really doesnt appeal to me...


From karen.wang at avant-port.com.cn  Thu Mar  4 05:38:08 2010
From: karen.wang at avant-port.com.cn (Karen Wang)
Date: Thu, 4 Mar 2010 18:38:08 +0800
Subject: How to  login https sever with inputing account name and password?
Message-ID: <20100304103731.740AC40E@smtpcom.263xmail.com>

Hi all,

I want to use python to access to https server, like
"https://212.218.229.10/chinatest/"

If open it from IE, will see the pop-up login windows like this 



I tried several ways but always only get page for" HTTP Error 401.2 -
Unauthorized" error. ( myusername and mypassword are all correct)

Below is my code:

import urllib2

values = {

    'user' : "myusername", 

"pass' : "mypassword" }

data = urllib2.urlencode(values)

t = urllib2.urlopen('https://212.218.229.10/chinatest/',data)

print t.read()

where I am wrong ?

Thank you very much.

 

 

Best Regards

Karen Wang

 

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From greg.ewing at canterbury.ac.nz  Thu Mar  4 05:38:22 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Thu, 04 Mar 2010 23:38:22 +1300
Subject: Old farts playing with their toys
In-Reply-To: <mailman.247.1267651670.23598.python-list@python.org>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>
	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>
	<4B8B9845.70604@sequans.com>	<mailman.59.1267456634.23598.python-list@python.org>	<7v695nFa0fU1@mid.individual.net>	<4B8E7538.2080003@mrabarnett.plus.com>	<20100303111248.7f40d659.darcy@druid.net>	<4B8EABCB.6050303@mrabarnett.plus.com>
	<mailman.247.1267651670.23598.python-list@python.org>
Message-ID: <7v9g9hF1hrU1@mid.individual.net>

D'Arcy J.M. Cain wrote:

> Did you ever play Star Trek with sound effects?

Not on that machine, but I played a version on an Apple II
that had normal speaker-generated sounds. I can still
remember the sound that a photon torpedo (a # character IIRC)
made as it lurched its way drunkenly across the sector and
hit its target. Bwoop... bwoop... bwoop... bwoop... bwoop...
bwoowoowoowoowoop! (Yes, a photon torpedo makes exactly
five bwoops when it explodes. Apparently.)

I carried a listing of it around with me for many years
afterwards, and attempted to port it to various machines,
with varying degrees of success. The most successful port
was for a BBC Master that I picked up in a junk shop one
day.

But I couldn't get the sounds right, because the BBC's
sound hardware was too intelligent. The Apple made sounds
by directly twiddling the output bit connected to the
loudspeaker, but you can't do that with a BBC -- you
have to go through its fancy 3-voice waveform generating
chip. And I couldn't get it to ramp up the pitch rapidly
enough to make a proper photon-torpedo "bwoop" sound. :-(

I also discovered that the lovely low-pitched beep that
the original game used to make at the command prompt had
a lot to do with the resonant properties of the Apple
II's big plastic case. Playing a square wave through
something too high-fidelity doesn't sound the same at
all.

> I was never able to
> get it to work but supposedly if you put an AM radio tuned to a
> specific frequency near the side with the I/O card it would generate
> static that was supposed to be the sound of explosions.
> 
> Of course, the explosions were happening in a vaccum so maybe the
> silence was accurate.  :-)

Something like that might possibly happen for real. I could
imagine an explosion in space radiating electromagnetic
noise that would sound explosion-like if you picked it
up on a radio.

This might explain why the Enterprise crew could hear things
exploding when they shot them. They were listening in at RF!

-- 
Greg


From greg.ewing at canterbury.ac.nz  Thu Mar  4 05:38:31 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Thu, 04 Mar 2010 23:38:31 +1300
Subject: Docstrings considered too complicated
In-Reply-To: <pan.2010.03.03.05.48.49@REMOVE.THIS.cybersource.com.au>
References: <20100224212303.242222c6@geekmail.INVALID>	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>	<20100227191040.6c77f2d8@geekmail.INVALID>	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>	<20100301182255.3de59bc6@geekmail.INVALID>	<mailman.66.1267465347.23598.python-list@python.org>	<20100301212954.7aa0b99d@geekmail.INVALID>
	<87eik3zmi8.fsf@benfinney.id.au>	<20100302184056.743a71e7@geekmail.INVALID>	<mailman.129.1267553139.23598.python-list@python.org>	<20100302225156.67171851@geekmail.INVALID>
	<877hpuxpdf.fsf@benfinney.id.au>	<7v6ae4Ff37U1@mid.individual.net>
	<pan.2010.03.03.05.48.49@REMOVE.THIS.cybersource.com.au>
Message-ID: <7v9g9qF1nkU1@mid.individual.net>

Steven D'Aprano wrote:

> True, but one can look at "best practice", or even "standard practice". 
> For Python coders, using docstrings is standard practice if not best 
> practice. Using strings as comments is not.

In that particular case, yes, it would be possible to
objectively examine the code and determine whether docstrings
were being used as opposed to above-the-function comments.

However, that's only a very small part of what goes to make
good code. Much more important are questions like: Are the
comments meaningful and helpful? Is the code reasonably
self-explanatory outside of the comments? Is it well
modularised, and common functionality factored out where
appropriate? Are couplings between different parts
minimised? Does it make good use of library code instead
of re-inventing things? Is it free of obvious security
flaws?

You can't *measure* these things. You can't objectively
boil them down to a number and say things like "This code
is 78.3% good; the customer requires it to be at least
75% good, so it meets the requirements in that area."

That's the way in which I believe that software engineering
is fundamentally different from hardware engineering.

-- 
Greg


From greg.ewing at canterbury.ac.nz  Thu Mar  4 05:43:20 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Thu, 04 Mar 2010 23:43:20 +1300
Subject: Adding to a module's __dict__?
In-Reply-To: <roy-3CB7A4.08210202032010@news.panix.com>
References: <0773959a-2ae7-4515-8196-67a50748f98f@e23g2000yqd.googlegroups.com>
	<mailman.96.1267508316.23598.python-list@python.org>
	<roy-3CB7A4.08210202032010@news.panix.com>
Message-ID: <7v9girF3b8U1@mid.individual.net>

Roy Smith wrote:
> The idea is I want to put in the beginning of the module:
> 
> declare('XYZ_FOO', 0, "The foo property")
> declare('XYZ_BAR', 1, "The bar property")
> declare('XYZ_BAZ', 2, "reserved for future use")

Okay, that seems like a passable excuse.

One thing to watch out for is that if your 'declare' function
is defined in a different module, when it calls globals() it
will get the globals of the module it's defined in, not the
one it's being called from.

There's a hackish way of getting around that, but it might
be better to put all of these symbols in a module of their
own and import them from it. The declare() function can then
be defined in that same module so that it accesses the right
globals.

-- 
Greg


From jeanmichel at sequans.com  Thu Mar  4 05:45:19 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Thu, 04 Mar 2010 11:45:19 +0100
Subject: Pylint Argument number differs from overridden method
In-Reply-To: <9ca2e014-f238-4b55-8ace-f884b2112a19@z11g2000yqz.googlegroups.com>
References: <2484ca6e-0eb9-4e0c-a7db-d035badab711@t20g2000yqe.googlegroups.com>	<mailman.226.1267644846.23598.python-list@python.org>
	<9ca2e014-f238-4b55-8ace-f884b2112a19@z11g2000yqz.googlegroups.com>
Message-ID: <4B8F8F3F.8010501@sequans.com>

Wanderer wrote:
> On Mar 3, 2:33 pm, Robert Kern <robert.k... at gmail.com> wrote:
>   
>> On 2010-03-03 11:39 AM, Wanderer wrote:
>>
>>     
>>> Pylint W0221 gives the warning
>>> Argument number differs from overridden method.
>>>       
>>> Why is this a problem? I'm overriding the method to add additional
>>> functionality.
>>>       
>> There are exceptions to every guideline. Doing this could easily be a mistake,
>> so it's one of the many things that Pylint checks for. Silence the warning if
>> you like.
>>
>> --
>> Robert Kern
>>
>> "I have come to believe that the whole world is an enigma, a harmless enigma
>>   that is made terrible by our own mad attempt to interpret it as though it had
>>   an underlying truth."
>>    -- Umberto Eco
>>     
>
> Thanks I was just wondering if I was overlooking something about
> inheritance.
>   
This is only my opinion but you get this warning because of 2 disctinct 
issues:
1/ you just made a basic mistake in your signature and need to correct it
2/ you did not make any mistake in the signature, but this warning may 
reveal a (small) flaw in your class design.


I don't know the exact context for your code, but it's better to have a 
consistant interface over your methods and mask the implementation 
details from the user.
In your case, the getRays method may always ask for the lambda 
parameters and just ignore it for one of its implementation.

And don't write empty doctrings to trick pylint. Either write them, or 
remove this rule, you are loosing all the tool benefits.


JM




From jpiitula at ling.helsinki.fi  Thu Mar  4 05:46:06 2010
From: jpiitula at ling.helsinki.fi (Jussi Piitulainen)
Date: 04 Mar 2010 12:46:06 +0200
Subject: Partly erratic wrong behaviour, Python 3, lxml
Message-ID: <qotr5o0xt3l.fsf@ruuvi.it.helsinki.fi>

Dear group,

I am observing weird semi-erratic behaviour that involves Python 3 and
lxml, is extremely sensitive to changes in the input data, and only
occurs when I name a partial result. I would like some help with this,
please. (Python 3.1.1; GNU/Linux; how do I find lxml version?)

The test script regress/Tribug is at the end of this message, with a
snippet to show the form of regress/tridata.py where the XML is.

What I observe is this. Parsing an XML document (wrapped in BytesIO)
with lxml.etree.parse and then extracting certain elements with xpath
sometimes fails so that I get three times the correct number of
elements. On the first run of the script, it fails in one way, and on
each subsequent run in another way: subsequent runs are repeatable.

Second, the bug only occurs when I give a name to the result from
lxml.etree.parse! This is seen below in the lines labeled "name1" or
"name2" that sometimes exhibit the bug, and lines labeled "nest1" or
"nest2" that never do. That is, this fails in some complex way:

        result = etree.parse(BytesIO(body))
        n = len(result.xpath(title))

This fails to fail:

        n = len(etree.parse(BytesIO(body)).xpath(title))

I have failed to observe the error interactively. I believe the
erroneus result lists are of the form [x x x y y y z z z] when they
should be [x y z] but I do not know if the x's are identical or
copies. I will know more later, of course, when I have written more
complex tests, unless somebody can lead me to a more profitable way of
debugging this.

Two versions of the test runs follow, before and after a trivial
change to the test data. Since the numbers are repeated n's of the
above snippets, they should all be the same: 5 observed 1000 times.

A first run after removing regress/tridata.pyc:

[1202] $ regress/Tribug 
name1: size 5 observed 969 times
name1: size 15 observed 31 times
name2: size 5 observed 1000 times
nest1: size 5 observed 1000 times
nest2: size 5 observed 1000 times

All subsequent runs, with regress/tridata.pyc recreated:

[1203] $ regress/Tribug 
name1: size 5 observed 1000 times
name2: size 5 observed 978 times
name2: size 15 observed 22 times
nest1: size 5 observed 1000 times
nest2: size 5 observed 1000 times

Adding an empty comment <!-- --> to the XML document;
a first run:

[1207] $ regress/Tribug 
name1: size 5 observed 992 times
name1: size 15 observed 8 times
name2: size 5 observed 1000 times
nest1: size 5 observed 1000 times
nest2: size 5 observed 1000 times

And subsequent runs:

[1208] $ regress/Tribug 
name1: size 5 observed 991 times
name1: size 15 observed 9 times
name2: size 5 observed 998 times
name2: size 15 observed 2 times
nest1: size 5 observed 1000 times
nest2: size 5 observed 1000 times

---start of regress/Tribug---
#! /bin/env python3
# -*- mode: Python; -*-

from io import BytesIO
from lxml import etree
from tridata import body, title

def naming():
    sizes = dict()
    for k in range(0,1000):
        result = etree.parse(BytesIO(body))
        n = len(result.xpath(title))
        sizes[n] = 1 + sizes.get(n, 0)
    return sizes

def nesting():
    sizes = dict()
    for k in range(0,1000):
        n = len(etree.parse(BytesIO(body)).xpath(title))
        sizes[n] = 1 + sizes.get(n, 0)
    return sizes

def report(label, sizes):
    for size, count in sizes.items():
        print('{}: size {} observed {} times'
              .format(label, size, count))

report('name1', naming())
report('name2', naming())
report('nest1', nesting())
report('nest2', nesting())
---end of regress/Tribug---

The file regress/tridata.py contains only the two constants. I omit
most of the XML. It would be several screenfuls.

---start of regress/tridata.py---
body = b'''<OAI-PMH xmlns="http://www.opena...
...
</OAI-PMH>
'''

title = '//*[name()="record"]//*[name()="dc:title"]'
---end of regress/tridata.py---


From greg.ewing at canterbury.ac.nz  Thu Mar  4 05:49:57 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Thu, 04 Mar 2010 23:49:57 +1300
Subject: Queue peek?
In-Reply-To: <137d7aa5-a305-4091-a244-904b680d3b56@t41g2000yqt.googlegroups.com>
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>
	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>
	<137d7aa5-a305-4091-a244-904b680d3b56@t41g2000yqt.googlegroups.com>
Message-ID: <7v9gv5F3b8U2@mid.individual.net>

Floris Bruynooghe wrote:
> I was just wondering if
> other people ever missed the "q.put_at_front_of_queue()" method or if
> it is just me.

Sounds like you don't want a queue, but a stack. Or
maybe a double-ended queue.

-- 
Greg


From jeanmichel at sequans.com  Thu Mar  4 05:50:06 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Thu, 04 Mar 2010 11:50:06 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <hmm5ln$arg$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>
	<hmm5ln$arg$1@news.eternal-september.org>
Message-ID: <4B8F905E.1090704@sequans.com>

Alf P. Steinbach wrote:
>>  From your post, the scope guard technique is used "to ensure some 
>> desired cleanup at the end of a scope, even when the scope is exited 
>> via an exception." This is precisely what the try: finally: syntax is 
>> for. 
>
> You'd have to nest it. That's ugly. And more importantly, now two 
> people in this thread (namely you and Mike) have demonstrated that 
> they do not grok the try functionality and manage to write incorrect 
> code, even arguing that it's correct when informed that it's not, so 
> it's a pretty fragile construct, like goto.

You want to execute some cleanup when things go wrong, use try except. 
You want to do it when things go right, use try else. You want to 
cleanup no matter what happen, use try finally.

There is no need of any Cleanup class, except for some technical 
alternative  concern.

JM




From greg.ewing at canterbury.ac.nz  Thu Mar  4 05:58:35 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Thu, 04 Mar 2010 23:58:35 +1300
Subject: case do problem
In-Reply-To: <hml77p$k1v$00$1@news.t-online.com>
References: <4b8d4ee4$0$1132$4fafbaef@reader1.news.tin.it>
	<hml77p$k1v$00$1@news.t-online.com>
Message-ID: <7v9hfeF8hsU1@mid.individual.net>

Peter Otten wrote:

> Something must be wrong with me today because I find the Pascal code /more/ 
> readable...

Actually I don't find either of them very readable. The
control flow is pretty convoluted either way. It might
be better if it used real-life variable and function
names to give some context, though.

-- 
Greg


From bruno.42.desthuilliers at websiteburo.invalid  Thu Mar  4 05:59:00 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 04 Mar 2010 11:59:00 +0100
Subject: Method / Functions - What are the differences?
In-Reply-To: <hmmrh4$644$1@newsreader3.netcologne.de>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
	<mailman.109.1267539415.23598.python-list@python.org>
	<hmk1mn$70u$1@newsreader3.netcologne.de>
	<4b8e4041$0$17447$426a34cc@news.free.fr>
	<hmlte9$d0f$1@dough.gmane.org>
	<mailman.205.1267633968.23598.python-list@python.org>
	<4b8e9660$0$21812$426a34cc@news.free.fr>
	<hmmrh4$644$1@newsreader3.netcologne.de>
Message-ID: <4b8f9267$0$17832$426a74cc@news.free.fr>

Eike Welk a ?crit :
> Bruno Desthuilliers wrote:
>> John Posner a ?crit :
>>> Done -- see http://wiki.python.org/moin/FromFunctionToMethod
>> Done and well done !-)
>> Thanks again for the good job John.
> 
> I like it too, thanks to both of you!
> 
> I have two small ideas for improvement: 
> - Swap the first two paragraphs. First say what it is, and then give the 
> motivation.

Mmm... As far as I'm concerned, I like it the way its. John ?

> - The section about the descriptor protocol is a bit difficult to 
> understand.

I may eventually try to rework it a bit when I'll have time (death march 
here currently, duh...)

> But judging from the official descriptor documentation, it seems 
> to be hard to explain

Not that easy, indeed. I once posted on c.l.py a longer explanation of 
the whole lookup rule stuff, that IIRC included a "naive python 
implementation" example. Might be worth trying to google for it and 
turning it into another "overview" article.

>: The official documentation is nearly incomprehensible 
> (IMHO).

I should probably have a look at it !-)


From greg.ewing at canterbury.ac.nz  Thu Mar  4 06:21:01 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Fri, 05 Mar 2010 00:21:01 +1300
Subject: Working group for Python CPAN-equivalence?
In-Reply-To: <slrnhotp4e.26k.peter@box8.pjb.com.au>
References: <mailman.179.1267620332.23598.python-list@python.org>
	<87r5o1v8vp.fsf@benfinney.id.au>
	<4b8e929d$0$1585$742ec2ed@news.sonic.net>
	<slrnhotp4e.26k.peter@box8.pjb.com.au>
Message-ID: <7v9ipdFfcsU1@mid.individual.net>

Peter Billam wrote:

> A very important thing about CPAN modules is the consistent
> basic install method:   perl Makefile.PL ; make ; make install

Well, we more or less have that with Python, too:

   python setup.py install

It may not always work smoothly, but it's the
one obvious thing to try when you've downloaded
a Python package in source form.

-- 
Greg


From olof.bjarnason at gmail.com  Thu Mar  4 06:45:39 2010
From: olof.bjarnason at gmail.com (Olof Bjarnason)
Date: Thu, 4 Mar 2010 12:45:39 +0100
Subject: Working group for Python CPAN-equivalence?
In-Reply-To: <7v9ipdFfcsU1@mid.individual.net>
References: <mailman.179.1267620332.23598.python-list@python.org>
	<87r5o1v8vp.fsf@benfinney.id.au>
	<4b8e929d$0$1585$742ec2ed@news.sonic.net>
	<slrnhotp4e.26k.peter@box8.pjb.com.au>
	<7v9ipdFfcsU1@mid.individual.net>
Message-ID: <c3dfe1d1003040345o33c7581fnfd8ee0b642c0f3ad@mail.gmail.com>

2010/3/4 Gregory Ewing <greg.ewing at canterbury.ac.nz>:
> Peter Billam wrote:
>
>> A very important thing about CPAN modules is the consistent
>> basic install method: ? perl Makefile.PL ; make ; make install
>
> Well, we more or less have that with Python, too:
>
> ?python setup.py install
>
> It may not always work smoothly, but it's the
> one obvious thing to try when you've downloaded
> a Python package in source form.
>
> --
> Greg
> --
> http://mail.python.org/mailman/listinfo/python-list
>

I want to say thanks to all that have given information regarding the
original question - for example the blog mention was valuable, aswell
as the disctintion between CPAN and cpan.

It was definately *not* my intention to start another "Where is CPAN
for Python?"-thread, but it seems we're already there. :)


-- 
http://olofb.wordpress.com


From mrkafk at gmail.com  Thu Mar  4 06:50:45 2010
From: mrkafk at gmail.com (mk)
Date: Thu, 04 Mar 2010 12:50:45 +0100
Subject: Generic singleton
In-Reply-To: <pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>
References: <mailman.222.1267642515.23598.python-list@python.org>
	<pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>
Message-ID: <hmo6qk$nop$1@dough.gmane.org>

Steven D'Aprano wrote:
> Groan. What is it with the Singleton design pattern? It is one of the 
> least useful design patterns, and yet it's *everywhere* in Java and C++ 
> world.

It's useful when larking about in language internals for learning 
purposes, for instance. I don't recall ever actually having significant 
need for it.


>>      def __new__(cls, impclass, *args, **kwargs):
>>          impid = id(impclass)
> 
> Yuck. Why are you using the id of the class as the key, instead of the 
> class itself?

Bc I didn't know whether it was safe to do that: like Arnaud pointed 
out, the *type* of bultins is hashable.

Regards,
mk





From mrkafk at gmail.com  Thu Mar  4 06:56:17 2010
From: mrkafk at gmail.com (mk)
Date: Thu, 04 Mar 2010 12:56:17 +0100
Subject: memory usage, temporary and otherwise
In-Reply-To: <4b8ee61a$0$26644$426a74cc@news.free.fr>
References: <mailman.220.1267642060.23598.python-list@python.org>
	<4b8ee61a$0$26644$426a74cc@news.free.fr>
Message-ID: <hmo751$plh$1@dough.gmane.org>

Bruno Desthuilliers wrote:
> mk a ?crit :
>> Obviously, don't try this on low-memory machine:
>>
>>>>> a={}
>>>>> for i in range(10000000):

> Note that in Python 2, this will build a list of 10000000 int objects.
> You may want to use xrange instead...

Huh? I was under impression that some time after 2.0 range was made to 
work "under the covers" like xrange when used in a loop? Or is it 3.0 
that does that?

> And this build yet another list of 10000000 int objects.

Well this explains much of the overhead.

> (overly simplified)
> 
> When an object is garbage-collected, the memory is not necessarily
> "returned" to the system - and the system doesn't necessarily claim it
> back neither until it _really_ needs it.
> 
> This avoid a _lot_ of possibly useless work for both the python
> interpreter (keeping already allocated memory costs less than immediatly
> returning it, just to try and allocate some more memory a couple
> instructions later) and the system (ditto - FWIW, how linux handles
> memory allocations is somewhat funny, if you ever programmed in C).

Ah! That explains a lot. Thanks to you, I have again expanded my 
knowledge of Python!

Hmm I would definitely like to read smth on how CPython handles memory 
on Python wiki. Thanks for that doc on wiki on "functions & methods" to 
you and John Posner, I'm reading it every day like a bible. ;-)


Regards,
mk



From ben+python at benfinney.id.au  Thu Mar  4 06:57:30 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Thu, 04 Mar 2010 22:57:30 +1100
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
	<87eik3zmi8.fsf@benfinney.id.au>
	<20100302184056.743a71e7@geekmail.INVALID>
	<mailman.129.1267553139.23598.python-list@python.org>
	<20100302225156.67171851@geekmail.INVALID>
	<877hpuxpdf.fsf@benfinney.id.au> <7v6ae4Ff37U1@mid.individual.net>
	<pan.2010.03.03.05.48.49@REMOVE.THIS.cybersource.com.au>
	<7v9g9qF1nkU1@mid.individual.net>
Message-ID: <87ocj4ti39.fsf@benfinney.id.au>

Gregory Ewing <greg.ewing at canterbury.ac.nz> writes:

> However, that's only a very small part of what goes to make good code.
> Much more important are questions like: Are the comments meaningful
> and helpful? Is the code reasonably self-explanatory outside of the
> comments? Is it well modularised, and common functionality factored
> out where appropriate? Are couplings between different parts
> minimised? Does it make good use of library code instead of
> re-inventing things? Is it free of obvious security flaws?
>
> You can't *measure* these things. You can't objectively boil them down
> to a number and say things like "This code is 78.3% good; the customer
> requires it to be at least 75% good, so it meets the requirements in
> that area."

That doesn't reduce the value of automating and testing those measures
we *can* make.

> That's the way in which I believe that software engineering is
> fundamentally different from hardware engineering.

Not at all. There are many quality issues in hardware engineering that
defy simple measurement; that does not reduce the value of standardising
quality minima for those measures that *can* be achieved simply.

-- 
 \        ?Spam will be a thing of the past in two years' time.? ?Bill |
  `\                                                 Gates, 2004-01-24 |
_o__)                                                                  |
Ben Finney


From bruno.42.desthuilliers at websiteburo.invalid  Thu Mar  4 06:59:27 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 04 Mar 2010 12:59:27 +0100
Subject: Interest check in some delicious syntactic sugar for "except:pass"
In-Reply-To: <mailman.170.1267608442.23598.python-list@python.org>
References: <mailman.170.1267608442.23598.python-list@python.org>
Message-ID: <4b8fa091$0$24833$426a74cc@news.free.fr>

Oren Elrad a ?crit :
> Howdy all, longtime appreciative user, first time mailer-inner.
> 
> I'm wondering if there is any support (tepid better than none) for the
> following syntactic sugar:
> 
> silence:
> ........ block
> 
> ------------------------->
> 
> try:
> ........block
> except:
> ........pass
> 

Hopefully not.

> The logic here is that there are a ton of "except: pass" statements[1]
> floating around in code that do not need to be there.

s/do not need to be/NEVER should have been at first/





From mrkafk at gmail.com  Thu Mar  4 07:01:38 2010
From: mrkafk at gmail.com (mk)
Date: Thu, 04 Mar 2010 13:01:38 +0100
Subject: NoSQL Movement?
In-Reply-To: <6cc20cea1003031423v4410119dh767610e78ba3eb6e@mail.gmail.com>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<6cc20cea1003031423v4410119dh767610e78ba3eb6e@mail.gmail.com>
Message-ID: <hmo7f1$rhb$1@dough.gmane.org>

Jonathan Gardner wrote:

> When you are starting a new project and you don't have a definitive
> picture of what the data is going to look like or how it is going to
> be queried, SQL databases (like PostgreSQL) will help you quickly
> formalize and understand what your data needs to do. In this role,
> these databases are invaluable. I can see no comparable tool in the
> wild, especially not OODBMS.

FWIW, I talked to my promoting professor about the subject, and he 
claimed that there's quite a number of papers on OODBMS that point to 
fundamental problems with constructing capable query languages for 
OODBMS. Sadly, I have not had time to get & read those sources.

Regards,
mk



From duncan.booth at invalid.invalid  Thu Mar  4 07:21:26 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 4 Mar 2010 12:21:26 GMT
Subject: Generic singleton
References: <mailman.222.1267642515.23598.python-list@python.org>
	<pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>
Message-ID: <Xns9D317DB33C63Aduncanbooth@127.0.0.1>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:

> On Wed, 03 Mar 2010 19:54:52 +0100, mk wrote:
> 
>> Hello,
>> 
>> So I set out to write generic singleton, i.e. the one that would do a
>> singleton with attributes of specified class. At first:
> 
> Groan. What is it with the Singleton design pattern? It is one of the 
> least useful design patterns, and yet it's *everywhere* in Java and C++ 
> world.

It is also *everywhere* in the Python world. Unlike Java and C++, Python 
even has its own built-in type for singletons.

If you want a singleton in Python use a module.

So the OP's original examples become:

--- file singleton.py ---
foo = {}
bar = []

--- other.py ---
from singleton import foo as s1
from singleton import foo as s2
from singleton import bar as s3
from singleton import bar as s4

... and then use them as you wish.



-- 
Duncan Booth http://kupuguy.blogspot.com


From duncan.booth at invalid.invalid  Thu Mar  4 07:24:52 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 4 Mar 2010 12:24:52 GMT
Subject: memory usage, temporary and otherwise
References: <mailman.220.1267642060.23598.python-list@python.org>
Message-ID: <Xns9D317E4A4CAD5duncanbooth@127.0.0.1>

mk <mrkafk at gmail.com> wrote:

> Hm, apparently Python didn't spot that 'spam'*10 in a's values is really 
> the same string, right?

If you want it to spot that then give it a hint that it should be looking 
for identical strings:

 >>> a={}
 >>> for i in range(10000000):
...     a[i]=intern('spam'*10)

should reduce your memory use somewhat.

-- 
Duncan Booth http://kupuguy.blogspot.com


From J.Fine at open.ac.uk  Thu Mar  4 07:30:12 2010
From: J.Fine at open.ac.uk (Jonathan Fine)
Date: Thu, 04 Mar 2010 12:30:12 +0000
Subject: WANTED: A good name for the pair (args, kwargs)
Message-ID: <hmo94l$9hb$1@south.jnrs.ja.net>

Hi

We can call a function fn using
     val = fn(*args, **kwargs)

I'm looking for a good name for the pair (args, kwargs).  Any suggestions?

Here's my use case:
     def doit(fn , wibble, expect):
         args, kwargs = wibble
         actual = fn(*args, **kwargs)
         if actual != expect:
             # Something has gone wrong.
             pass

This is part of a test runner.

For now I'll use argpair, but if anyone has a better idea, I'll use it.

-- 
Jonathan


From mrkafk at gmail.com  Thu Mar  4 07:34:39 2010
From: mrkafk at gmail.com (mk)
Date: Thu, 04 Mar 2010 13:34:39 +0100
Subject: taking python enterprise level?...
In-Reply-To: <0C9B223A-D32A-474C-80E3-7F912447170F@semanchuk.com>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>	<20100302015813.5397655e.darcy@druid.net>	<hmm2jc$28u$1@dough.gmane.org>	<973824D8-3020-44A8-B2DA-501FF530457B@semanchuk.com>	<hmmih7$1bs$1@dough.gmane.org>
	<0C9B223A-D32A-474C-80E3-7F912447170F@semanchuk.com>
Message-ID: <hmo9cv$2nv$1@dough.gmane.org>

Philip Semanchuk wrote:
> Well OK, but that's a very different argument. Yes, joins can be 
> expensive. They're often still the best option, though. The first step 
> people usually take to get away from joins is denormalization which can 
> improve SELECT performance at the expense of slowing down INSERTs, 
> UPDATEs, and DELETEs, not to mention complicating one's code and data 
> model. Is that a worthwhile trade? 

I'd say that in more than 99% of situations: NO.

More than that: if I haven't normalized my data as it should have been 
normalized, I wouldn't be able to do complicated querying that I really, 
really have to be able to do due to business logic. A few of my queries 
have a few hundred lines each with many sub-queries and multiple 
many-to-many joins: I *dread the thought* what would happen if I had to 
reliably do it in a denormalized db and still ensure data integrity 
across all the business logic contexts. And performance is still more 
than good enough: so there's no point for me, as of the contexts I 
normally work in, to denormalize data at all.

It's just interesting for me to see what happens in that <1% of situations.

> Depends on the application. As I 
> said, sometimes the cure is worse than the disease.
> 
> Don't worry about joins until you know they're a problem. As Knuth said, 
> premature optimization is the root of all evil.

Sure -- the cost of joins is just interesting to me as a 'corner case'. 
I don't have datasets large enough for this to matter in the first place 
(and I probably won't have them that huge).

> PS - Looks like you're using Postgres -- excellent choice. I miss using it.

If you can, I'd recommend using SQLAlchemy layer on top of 
Oracle/Mysql/Sqlite, if that's what you have to use: this *largely* 
insulates you from the problems below and it does the job of translating 
into a peculiar dialect very well. For my purposes, SQLAlchemy worked 
wonderfully: it's very flexible, it has middle-level sql expression 
language if normal querying is not flexible enough (and normal querying 
is VERY flexible), it has a ton of nifty features like autoloading and 
rarely fails bc of some lower-level DB quirk AND its high-level object 
syntax is so similar to SQL that you quickly & intuitively grasp it.

(and if you have to/prefer writing some query in "low-level" SQL, as I 
have done a few times, it's still easy to make SQLAlchemy slurp the 
result into objects provided you ensure there are all of the necessary 
columns in the query result)

Regards,
mk



From spamfresser at ch3ka.de  Thu Mar  4 07:41:22 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Thu, 04 Mar 2010 13:41:22 +0100
Subject: How to login https sever with inputing account name and password?
In-Reply-To: <mailman.281.1267704055.23598.python-list@python.org>
References: <mailman.281.1267704055.23598.python-list@python.org>
Message-ID: <hmo9po$bvj$1@news.urz.uni-heidelberg.de>

Am 04.03.2010 11:38, schrieb Karen Wang:
> Hi all,
>
> I want to use python to access to https server, like
> "https://212.218.229.10/chinatest/"
>
> If open it from IE, will see the pop-up login windows like this
>
>
>
> I tried several ways but always only get page for" HTTP Error 401.2 -
> Unauthorized" error. ( myusername and mypassword are all correct)
>
> Below is my code:
>
> import urllib2
>
> values = {
>
>      'user' : "myusername",
>
> "pass' : "mypassword" }
>
> data = urllib2.urlencode(values)
>
> t = urllib2.urlopen('https://212.218.229.10/chinatest/',data)
>
> print t.read()
>
> where I am wrong ?

AFAIR does urlopen() expect the password to be Base64-encoded, not 
urlencoded.

You might also need to add an AUTH-Line. But this all does not matter, 
as there is more than one AUTH-Method you'd have to implement them all, 
but fortunately urllib2.HTTPBasicAuthHandler and 
urllib2.HTTPBasicAuthHandler exist.

So use them:

import urllib2
passman = urllib2.HTTPPasswordMgrWithDefaultRealm()
passman.add_password(None, theurl, username, password)
authhandler = urllib2.HTTPBasicAuthHandler(passman)
opener = urllib2.build_opener(authhandler)
urllib2.install_opener(opener)
pagehandle = urllib2.urlopen(theurl)

(taken from 
http://www.voidspace.org.uk/python/articles/authentication.shtml )

Further reference:
http://www.python.org/doc/2.5.2/lib/module-urllib2.html
http://www.python.org/doc/2.5.2/lib/urllib2-examples.html

HTH,
Michael


From william302888 at gmail.com  Thu Mar  4 07:42:50 2010
From: william302888 at gmail.com (jack)
Date: Thu, 4 Mar 2010 04:42:50 -0800 (PST)
Subject: 15541 - Best, Cheapest Web-Hosting, Domain at $1.99!
Message-ID: <0ec7cefa-ea65-43c0-8d2e-8bdb4b56fb7a@t17g2000prg.googlegroups.com>

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From python.list at tim.thechases.com  Thu Mar  4 07:50:14 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Thu, 04 Mar 2010 06:50:14 -0600
Subject: WANTED: A good name for the pair (args, kwargs)
In-Reply-To: <hmo94l$9hb$1@south.jnrs.ja.net>
References: <hmo94l$9hb$1@south.jnrs.ja.net>
Message-ID: <4B8FAC86.4020605@tim.thechases.com>

Jonathan Fine wrote:
> We can call a function fn using
>      val = fn(*args, **kwargs)
> 
> I'm looking for a good name for the pair (args, kwargs).  Any suggestions?
> 
> For now I'll use argpair, but if anyone has a better idea, I'll use it.

In the legacy of C and Java (okay, that doesn't carry _much_ 
weight with me), I'd go with "varargs" to refer to the pair of 
(args, kwargs)

-tkc





From anand.shashwat at gmail.com  Thu Mar  4 07:54:27 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Thu, 4 Mar 2010 18:24:27 +0530
Subject: How to login https sever with inputing account name and password?
In-Reply-To: <hmo9po$bvj$1@news.urz.uni-heidelberg.de>
References: <mailman.281.1267704055.23598.python-list@python.org> 
	<hmo9po$bvj$1@news.urz.uni-heidelberg.de>
Message-ID: <d4ab53de1003040454o49d569cdqce73dcfb12d0d734@mail.gmail.com>

You may also want to look into mechanize module.

On Thu, Mar 4, 2010 at 6:11 PM, Michael Rudolf <spamfresser at ch3ka.de> wrote:

> Am 04.03.2010 11:38, schrieb Karen Wang:
>
>  Hi all,
>>
>> I want to use python to access to https server, like
>> "https://212.218.229.10/chinatest/"
>>
>> If open it from IE, will see the pop-up login windows like this
>>
>>
>>
>> I tried several ways but always only get page for" HTTP Error 401.2 -
>> Unauthorized" error. ( myusername and mypassword are all correct)
>>
>> Below is my code:
>>
>> import urllib2
>>
>> values = {
>>
>>     'user' : "myusername",
>>
>> "pass' : "mypassword" }
>>
>> data = urllib2.urlencode(values)
>>
>> t = urllib2.urlopen('https://212.218.229.10/chinatest/',data)
>>
>> print t.read()
>>
>> where I am wrong ?
>>
>
> AFAIR does urlopen() expect the password to be Base64-encoded, not
> urlencoded.
>
> You might also need to add an AUTH-Line. But this all does not matter, as
> there is more than one AUTH-Method you'd have to implement them all, but
> fortunately urllib2.HTTPBasicAuthHandler and urllib2.HTTPBasicAuthHandler
> exist.
>
> So use them:
>
> import urllib2
> passman = urllib2.HTTPPasswordMgrWithDefaultRealm()
> passman.add_password(None, theurl, username, password)
> authhandler = urllib2.HTTPBasicAuthHandler(passman)
> opener = urllib2.build_opener(authhandler)
> urllib2.install_opener(opener)
> pagehandle = urllib2.urlopen(theurl)
>
> (taken from
> http://www.voidspace.org.uk/python/articles/authentication.shtml )
>
> Further reference:
> http://www.python.org/doc/2.5.2/lib/module-urllib2.html
> http://www.python.org/doc/2.5.2/lib/urllib2-examples.html
>
> HTH,
> Michael
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From duncan.booth at invalid.invalid  Thu Mar  4 08:10:34 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 4 Mar 2010 13:10:34 GMT
Subject: NoSQL Movement?
References: <mailman.256.1267655008.23598.python-list@python.org>
	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
Message-ID: <Xns9D318550EF1D6duncanbooth@127.0.0.1>

Avid Fan <me at privacy.net> wrote:

> Jonathan Gardner wrote:
> 
>> 
>> I see it as a sign of maturity with sufficiently scaled software that
>> they no longer use an SQL database to manage their data. At some 
point
>> in the project's lifetime, the data is understood well enough that 
the
>> general nature of the SQL database is unnecessary.
>> 
> 
> I am really struggling to understand this concept.
> 
> Is it the normalised table structure that is in question or the query 
> language?
> 
> Could you give some sort of example of where SQL would not be the way 
to 
> go.   The only things I can think of a simple flat file databases.

Probably one of the best known large non-sql databases is Google's 
bigtable. Xah Lee of course dismissed this as he decided to write how 
bad non-sql databases are without actually looking at the prime example.

If you look at some of the uses of bigtable you may begin to understand 
the tradeoffs that are made with sql. When you use bigtable you have 
records with fields, and you have indices, but there are limitations on 
the kinds of queries you can perform: in particular you cannot do joins, 
but more subtly there is no guarantee that the index is up to date (so 
you might miss recent updates or even get data back from a query when 
the data no longer matches the query).

By sacrificing some of SQL's power, Google get big benefits: namely 
updating data is a much more localised option. Instead of an update 
having to lock the indices while they are updated, updates to different 
records can happen simultaneously possibly on servers on the opposite 
sides of the world. You can have many, many servers all using the same 
data although they may not have identical or completely consistent views 
of that data.

Bigtable impacts on how you store the data: for example you need to 
avoid reducing data to normal form (no joins!), its much better and 
cheaper just to store all the data you need directly in each record. 
Also aggregate values need to be at least partly pre-computed and stored 
in the database.

Boiling this down to a concrete example, imagine you wanted to implement 
a system like twitter. Think carefully about how you'd handle a 
sufficiently high rate of new tweets reliably with a sql database. Now 
think how you'd do the same thing with bigtable: most tweets don't 
interact, so it becomes much easier to see how the load is spread across 
the servers: each user has the data relevant to them stored near the 
server they are using and index changes propagate gradually to the rest 
of the system.

-- 
Duncan Booth http://kupuguy.blogspot.com


From eric.brunel.pragmadev at gmail.com  Thu Mar  4 08:20:43 2010
From: eric.brunel.pragmadev at gmail.com (eb303)
Date: Thu, 4 Mar 2010 05:20:43 -0800 (PST)
Subject: Instance factory - am I doing this right?
References: <mailman.212.1267638104.23598.python-list@python.org>
Message-ID: <a289fa45-dfae-4200-bb3a-745a4fe0d7cd@q21g2000yqm.googlegroups.com>

On Mar 3, 6:41?pm, Laszlo Nagy <gand... at shopzeus.com> wrote:
> This is just an interesting code pattern that I have recently used:
>
> class CacheStorage(object):
> ? ? """Generic cache storage class."""
> ? ? @classmethod
> ? ? def get_factory(cls,*args,**kwargs):
> ? ? ? ? """Create factory for a given set of cache storage creation
> parameters."""
> ? ? ? ? class CacheStorageFactory(cls):
> ? ? ? ? ? ? _construct_args = args
> ? ? ? ? ? ? _construct_kwargs = kwargs
> ? ? ? ? ? ? def __init__(self):
> ? ? ? ? ? ? ? ? cls.__init__(self,
> ? ? ? ? ? ? ? ? ? ? *self._construct_args,**self._construct_kwargs)
> ? ? ? ? return CacheStorageFactory
>
> Then, I can create subclasses like:
>
> class GdbmCacheStorage(CacheStorage):
> ? ? """Gdbm cache storage class.
>
> ? ? @param basedir: Base directory where gdbm files should be stored.
> ? ? @param basename: Base name for logging and creating gdbm files.
> ? ? """
> ? ? def __init__(self,basedir,basename):
> ? ? ? ? ? ..... blablabla place initialization code here
>
> class MemoryCacheStorage(CacheStorage):
> ? ? """In-Memory cache storage class.
>
> ? ? Please note that keys and values are always mashal-ed.
> ? ? E.g. when you cache an object, it makes a deep copy.
> ? ? """
> ? ? def __init__(self):
> ? ? ? ? ? ..... blablabla place initialization code here
>
> And the finally, I can create a factory that can create cache storage
> instances for storing data in gdbm in a given directory:
>
> cache_factory = GdbmCacheStorage.get_factory("~gandalf/db","test")
> print cache_factory # <class '__main__.CacheStorageFactory'>
> print cache_factory()
>
> OR I can create a factory that can create instances for storing data in
> memory:
>
> cache_factory = MemoryCacheStorage.get_factory()
> print cache_factory # <class '__main__.CacheStorageFactory'>
> print cache_factory() # <__main__.CacheStorageFactory object at 0x8250c6c>
>
> Now, here is my question. Am I right in doing this? Or are there better
> language tools to be used in Python for the same thing? This whole thing
> about creating factories looks a bit odd for me. Is it Pythonic enough?
>
> Thanks,
>
> ? ?Laszlo

Seems you try to reinvent functools:

class GdbmCacheStorage(object):
  def __init__(self,basedir,basename):
    ...
cache_factory = functools.partial(GdbmCacheStorage, "~gandalf/db",
"test")
print cache_factory()

Is it what you're after? I didn't see the point in creating a "cached
factory" for MemoryCacheStorage though, since it has no constructor
parameters to cache anyway. So doing 'cache_factory =
MemoryCacheStorage' in your example would do exactly the same thing as
what you did.

HTH
 - Eric -


From phd at phd.pp.ru  Thu Mar  4 08:34:05 2010
From: phd at phd.pp.ru (Oleg Broytman)
Date: Thu, 4 Mar 2010 16:34:05 +0300
Subject: SQLObject 0.11.4
Message-ID: <20100304133404.GB4443@phd.pp.ru>

Hello!

I'm pleased to announce version 0.11.4, a minor bugfix release of 0.11 branch
of SQLObject.


What is SQLObject
=================

SQLObject is an object-relational mapper.  Your database tables are described
as classes, and rows are instances of those classes.  SQLObject is meant to be
easy to use and quick to get started with.

SQLObject supports a number of backends: MySQL, PostgreSQL, SQLite,
Firebird, Sybase, MSSQL and MaxDB (also known as SAPDB).


Where is SQLObject
==================

Site:
http://sqlobject.org

Development:
http://sqlobject.org/devel/

Mailing list:
https://lists.sourceforge.net/mailman/listinfo/sqlobject-discuss

Archives:
http://news.gmane.org/gmane.comp.python.sqlobject

Download:
http://cheeseshop.python.org/pypi/SQLObject/0.11.4

News and changes:
http://sqlobject.org/News.html


What's New
==========

News since 0.11.3
-----------------

* Fixed a bug in inheritance - if creation of the row failed and if the
  connection is not a transaction and is in autocommit mode - remove
  parent row(s).

* Do not set _perConnection flag if get() or _init() is passed the same
  connection; this is often the case with select().

For a more complete list, please see the news:
http://sqlobject.org/News.html

Oleg.
-- 
     Oleg Broytman            http://phd.pp.ru/            phd at phd.pp.ru
           Programmers don't die, they just GOSUB without RETURN.


From jjposner at optimum.net  Thu Mar  4 08:35:05 2010
From: jjposner at optimum.net (John Posner)
Date: Thu, 04 Mar 2010 08:35:05 -0500
Subject: Method / Functions - What are the differences?
In-Reply-To: <4b8f9267$0$17832$426a74cc@news.free.fr>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
	<mailman.109.1267539415.23598.python-list@python.org>
	<hmk1mn$70u$1@newsreader3.netcologne.de>
	<4b8e4041$0$17447$426a34cc@news.free.fr>
	<hmlte9$d0f$1@dough.gmane.org>
	<mailman.205.1267633968.23598.python-list@python.org>
	<4b8e9660$0$21812$426a34cc@news.free.fr>
	<hmmrh4$644$1@newsreader3.netcologne.de>
	<4b8f9267$0$17832$426a74cc@news.free.fr>
Message-ID: <4B8FB709.9080609@optimum.net>

On 3/4/2010 5:59 AM, Bruno Desthuilliers wrote:
>>
>> I have two small ideas for improvement: - Swap the first two
>> paragraphs. First say what it is, and then give the motivation.
>
> Mmm... As far as I'm concerned, I like it the way its. John ?

I think it doesn't make very much difference. But in the end, I believe 
it's the student, not the teacher, who gets to decide what's comprehensible.

What *does* make a difference, IMHO, is getting more people to 
participate in the process of shining lights into Python's darker 
corners. That's why I encouraged (and still encourage) Eike to roll up 
the sleeves and wade into these waters.

Metaphor-mixingly yours,
John


From no.email at nospam.invalid  Thu Mar  4 08:37:59 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Thu, 04 Mar 2010 05:37:59 -0800
Subject: WANTED: A good name for the pair (args, kwargs)
References: <hmo94l$9hb$1@south.jnrs.ja.net>
Message-ID: <7x8wa85hs8.fsf@ruckus.brouhaha.com>

Jonathan Fine <J.Fine at open.ac.uk> writes:
> I'm looking for a good name for the pair (args, kwargs).  Any suggestions?
>
> Here's my use case:
>     def doit(fn , wibble, expect):
>         args, kwargs = wibble
>         actual = fn(*args, **kwargs)

I think this may have been broken in 3.x, but in 2.6 the compiler will
unpack directly if you put a tuple structure in the arg list:

         def doit(fn, (args, kwargs), expect):
             actual = fn(*args, **kwargs)

Otherwise I'd just say "all_args" or some such.  Or just "args" which
you unpack into "pos_args" (positional args) and "kw_args".


From phd at phd.pp.ru  Thu Mar  4 08:41:46 2010
From: phd at phd.pp.ru (Oleg Broytman)
Date: Thu, 4 Mar 2010 16:41:46 +0300
Subject: SQLObject 0.12.2
Message-ID: <20100304134146.GF4443@phd.pp.ru>

Hello!

I'm pleased to announce version 0.12.2, a bugfix release of branch 0.12
of SQLObject.


What is SQLObject
=================

SQLObject is an object-relational mapper.  Your database tables are described
as classes, and rows are instances of those classes.  SQLObject is meant to be
easy to use and quick to get started with.

SQLObject supports a number of backends: MySQL, PostgreSQL, SQLite,
Firebird, Sybase, MSSQL and MaxDB (also known as SAPDB).


Where is SQLObject
==================

Site:
http://sqlobject.org

Development:
http://sqlobject.org/devel/

Mailing list:
https://lists.sourceforge.net/mailman/listinfo/sqlobject-discuss

Archives:
http://news.gmane.org/gmane.comp.python.sqlobject

Download:
http://cheeseshop.python.org/pypi/SQLObject/0.12.2

News and changes:
http://sqlobject.org/News.html


What's New
==========

News since 0.12.1
-----------------

* Fixed a bug in inheritance - if creation of the row failed and if the
  connection is not a transaction and is in autocommit mode - remove
  parent row(s).

* Do not set _perConnection flag if get() or _init() is passed the same
  connection; this is often the case with select().

For a more complete list, please see the news:
http://sqlobject.org/News.html

Oleg.
-- 
     Oleg Broytman            http://phd.pp.ru/            phd at phd.pp.ru
           Programmers don't die, they just GOSUB without RETURN.


From bieffe62 at gmail.com  Thu Mar  4 08:45:40 2010
From: bieffe62 at gmail.com (Francesco Bochicchio)
Date: Thu, 4 Mar 2010 05:45:40 -0800 (PST)
Subject: Passing FILE * types using ctypes
References: <a83319d7-c199-4532-9816-d002f7fd7914@q16g2000yqq.googlegroups.com>
Message-ID: <bac1318c-d5a2-4dfc-a716-2977959f7a06@b30g2000yqd.googlegroups.com>

On Mar 4, 12:50?am, Zeeshan Quireshi <zeeshan.quire... at gmail.com>
wrote:
> Hello, I'm using ctypes to wrap a library i wrote. I am trying to pass
> it a FILE *pointer, how do i open a file in Python and convert it to a
> FILE *pointer. Or do i have to call the C library using ctypes first,
> get the pointer and then pass it to my function.
>
> Also, is there any automated way to convert c struct and enum
> definitions to ctypes data types.
>
> Zeeshan

Python file objects have a method fileno() whic returns the 'C file
descriptor', i.e. the number used by low level IO in python as well as
in C.
I would use this as interface between python and C and then in the C
function using fdopen to get a FILE * for an already open file for
which you have a file descriptor.

If you don't want change the C interface, you could try using fdopen
in python by loading the standard C library ang using ctypes
to call the function. (I tried briefly but always get 0 from fdopen ).

But if you can change the C code, why not to pass the file name? The
idea of opening the file in python and manage it in C feels a bit
icky ...

Ciao
----
FB



From cartercc at gmail.com  Thu Mar  4 09:21:49 2010
From: cartercc at gmail.com (ccc31807)
Date: Thu, 4 Mar 2010 06:21:49 -0800 (PST)
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com> 
	<26bd4a5c-4d66-4597-a0ee-b4990f468e68@g26g2000yqn.googlegroups.com>
Message-ID: <e0a86785-bb68-4977-8864-010ca4f71a6c@19g2000yqu.googlegroups.com>

On Mar 3, 4:55?pm, toby <t... at telegraphics.com.au> wrote:
> > ?where you have to store data and
>
> "relational data"

Data is neither relational nor unrelational. Data is data.
Relationships are an artifact, something we impose on the data.
Relations are for human convenience, not something inherent in the
data itself.

> > perform a large number of queries.
>
> Why does the number matter?

Have you ever had to make a large number of queries to an XML
database? In some ways, an XML database is the counterpart to a
relational database in that the data descriptions constitute the
relations. However, since the search is to the XML elements, and you
can't construct indicies for XML databases in the same way you can
with relational databases, a large search can take much longer that
you might expect.

CC.


From jmg3000 at gmail.com  Thu Mar  4 09:39:51 2010
From: jmg3000 at gmail.com (John Gabriele)
Date: Thu, 4 Mar 2010 06:39:51 -0800 (PST)
Subject: Working group for Python CPAN-equivalence?
References: <mailman.179.1267620332.23598.python-list@python.org> 
	<87r5o1v8vp.fsf@benfinney.id.au>
	<4b8e929d$0$1585$742ec2ed@news.sonic.net> 
	<hmmiks$1ru$1@dough.gmane.org>
	<6cc20cea1003031417i15b66bcdi454bba5a9c642d95@mail.gmail.com> 
	<mailman.261.1267659815.23598.python-list@python.org>
	<871vg0bzua.fsf@castleamber.com>
Message-ID: <8506d9dc-2e6d-4f66-9d55-8173f47f7d4e@i25g2000yqm.googlegroups.com>

On Mar 3, 9:11?pm, John Bokma <j... at castleamber.com> wrote:
> Philip Semanchuk <phi... at semanchuk.com> writes:
>
> > In other words, if I was a Perl user under Ubuntu would I use
> > the pkg manager to add a Perl module, or CPAN, or would both work?
>
> Both would work, but I would make very sure to use a separate
> installation directory for modules installed via CPAN.

What's worked best for me is: use *only* the apt system to install
modules into your system Perl (`/usr/bin/perl`) and use *only* cpan/
cpanp/cpanm to install modules into *your own* Perl (for example, you
may have installed into `/opt`).

> AFAIK there are also programs that pack CPAN modules/bundles into
> something the package manager can use to install.

Right. If you really want to install a module for which there's no
Debian package, and you don't want to install your own Perl, this is a
good route to take.

Incidentally, this is the same way I recommend handling the situation
with Python: Use only aptitude to install packages for your system
Python, and use only pip to install packages into your own Python
(which you built and installed elsewhere, ex., `/opt/py-2.6.4`).

---John


From mrkafk at gmail.com  Thu Mar  4 09:47:22 2010
From: mrkafk at gmail.com (mk)
Date: Thu, 04 Mar 2010 15:47:22 +0100
Subject: NoSQL Movement?
In-Reply-To: <Xns9D318550EF1D6duncanbooth@127.0.0.1>
References: <mailman.256.1267655008.23598.python-list@python.org>	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
	<Xns9D318550EF1D6duncanbooth@127.0.0.1>
Message-ID: <hmoh5p$16e$1@dough.gmane.org>

Duncan Booth wrote:

> If you look at some of the uses of bigtable you may begin to understand 
> the tradeoffs that are made with sql. When you use bigtable you have 
> records with fields, and you have indices, but there are limitations on 
> the kinds of queries you can perform: in particular you cannot do joins, 
> but more subtly there is no guarantee that the index is up to date (so 
> you might miss recent updates or even get data back from a query when 
> the data no longer matches the query).

Hmm, I do understand that bigtable is used outside of traditional 
'enterprisey' contexts, but suppose you did want to do an equivalent of 
join; is it at all practical or even possible?

I guess when you're forced to use denormalized data, you have to 
simultaneously update equivalent columns across many tables yourself, 
right? Or is there some machinery to assist in that?

> By sacrificing some of SQL's power, Google get big benefits: namely 
> updating data is a much more localised option. Instead of an update 
> having to lock the indices while they are updated, updates to different 
> records can happen simultaneously possibly on servers on the opposite 
> sides of the world. You can have many, many servers all using the same 
> data although they may not have identical or completely consistent views 
> of that data.

And you still have the global view of the table spread across, say, 2 
servers, one located in Australia, second in US?

> Bigtable impacts on how you store the data: for example you need to 
> avoid reducing data to normal form (no joins!), its much better and 
> cheaper just to store all the data you need directly in each record. 
> Also aggregate values need to be at least partly pre-computed and stored 
> in the database.

So you basically end up with a few big tables or just one big table really?

Suppose on top of 'tweets' table you have 'dweebs' table, and tweets and 
dweebs sometimes do interact. How would you find such interacting pairs? 
Would you say "give me some tweets" to tweets table, extract all the 
dweeb_id keys from tweets and then retrieve all dweebs from dweebs table?

> Boiling this down to a concrete example, imagine you wanted to implement 
> a system like twitter. Think carefully about how you'd handle a 
> sufficiently high rate of new tweets reliably with a sql database. Now 
> think how you'd do the same thing with bigtable: most tweets don't 
> interact, so it becomes much easier to see how the load is spread across 
> the servers: each user has the data relevant to them stored near the 
> server they are using and index changes propagate gradually to the rest 
> of the system.

I guess that in a purely imaginary example, you could also combine two 
databases? Say, a tweet bigtable db contains tweet, but with column of 
classical customer_id key that is also a key in traditional RDBMS 
referencing particular customer?

Regards,
mk




From tim.wintle at teamrubber.com  Thu Mar  4 10:23:33 2010
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 04 Mar 2010 15:23:33 +0000
Subject: taking python enterprise level?...
In-Reply-To: <hmmdtn$fkn$1@dough.gmane.org>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>
	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>
	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>
	<20100302015813.5397655e.darcy@druid.net>	<hmm2jc$28u$1@dough.gmane.org>
	<1267638602.988.19.camel@localhost>  <hmmdtn$fkn$1@dough.gmane.org>
Message-ID: <1267716213.23300.7.camel@localhost>

On Wed, 2010-03-03 at 20:39 +0100, mk wrote:
> Hello Tim,
> 
> Pardon the questions but I haven't had the need to use denormalization 
> yet, so:

> IOW you basically merged the tables like follows?
> 
> CREATE TABLE projects (
>      client_id BIGINT NOT NULL,
>      project_id BIGINT NOT NULL,
>      cost INT,
>      date DATETIME,
>      INDEX(client_id, project_id, date)
> );

Yup

> From what you write further in the mail I conclude that you have not 
> eliminated the first table, just made table projects look like I wrote 
> above, right? (and used stored procedures to make sure that both tables 
> contain the relevant data for client_id and project_id columns in both 
> tables)

Yup

> Have you had some other joins on denormalized keys? i.e. in example how 
> the join of hypothetical TableB with projects on projects.client_id 
> behave with such big tables? (bc I assume that you obviously can't 
> denormalize absolutely everything, so this implies the need of doing 
> some joins on denormalized columns like client_id).

For these joins (for SELECT statements) this _can_ end up running faster
- of course all of this depends on what kind of queries you normally end
up getting and the distribution of data in the indexes.

I've never written anything that started out with a schema like this,
but several have ended up getting denormalised as the projects have
matured and query behaviour has been tested

> > assuming you can access the first mapping anyway -
> 
> ? I'm not clear on what you mean here.

I'm refering to not eliminating the first table as you concluded

> 
> Regards,
> mk
> 



From tim.wintle at teamrubber.com  Thu Mar  4 10:29:23 2010
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 04 Mar 2010 15:29:23 +0000
Subject: taking python enterprise level?...
In-Reply-To: <20100303162314.a46484cf.darcy@druid.net>
References: <5cd38064-34d6-40d3-b3dc-2c853fc86728@i39g2000yqm.googlegroups.com>
	<1d8cf423-d13e-4b18-b68b-108f85cae5af@t34g2000prm.googlegroups.com>
	<6fd094d0-0fef-4aa2-aee7-49e8b39de3ad@g19g2000yqe.googlegroups.com>
	<778d3ba3-cbc0-49b3-b816-1260e0295bcf@f35g2000yqd.googlegroups.com>
	<20100302015813.5397655e.darcy@druid.net>
	<hmm2jc$28u$1@dough.gmane.org>
	<1267638602.988.19.camel@localhost> <hmmdtn$fkn$1@dough.gmane.org>
	<20100303162314.a46484cf.darcy@druid.net>
Message-ID: <1267716563.23300.13.camel@localhost>

On Wed, 2010-03-03 at 16:23 -0500, D'Arcy J.M. Cain wrote:
> On Wed, 03 Mar 2010 20:39:35 +0100
> mk <mrkafk at gmail.com> wrote:
> > > If you denormalise the table, and update the first index to be on
> > > (client_id, project_id, date) it can end up running far more quickly -
> 
> Maybe.  Don't start with denormalization.  Write it properly and only
> consider changing if profiling suggests that that is your bottleneck.

Quite - and I'd add to cache reads as much in front end machines as is
permissible in your use case before considering denormalisation.

> With a decent database engine and proper design it will hardly ever be.

I completely agree - I'm simply responding to the request for an example
where denormalisation may be a good idea.

Tim



From jmg3000 at gmail.com  Thu Mar  4 10:47:11 2010
From: jmg3000 at gmail.com (John Gabriele)
Date: Thu, 4 Mar 2010 07:47:11 -0800 (PST)
Subject: Working group for Python CPAN-equivalence?
References: <mailman.179.1267620332.23598.python-list@python.org> 
	<87r5o1v8vp.fsf@benfinney.id.au>
	<4b8e929d$0$1585$742ec2ed@news.sonic.net> 
	<mailman.239.1267650035.23598.python-list@python.org>
	<87eik1ujg4.fsf@benfinney.id.au>
Message-ID: <1f9fcfb3-204c-48c6-8142-9f7c2607b917@t20g2000yqe.googlegroups.com>

On Mar 3, 5:30?pm, Ben Finney <ben+pyt... at benfinney.id.au> wrote:
>
> Terry Reedy <tjre... at udel.edu> writes:
>
> > On 3/3/2010 12:05 PM, John Nagle wrote:
>
> > > CPAN enforces standard organization on packages. PyPi does not.
>
> This is, I think, something we don't need as much in Python; there is a
> fundamental difference between Perl's deeply nested namespace hierarchy
> and Python's inherently flat hierarchy.

What do you think that difference is? Both use nested namespaces. My
understanding is that if 2 different dists contain like-named
packages, and if a user installs both of them, they all just go to the
same place in the user's site-packages dir.

One difference I see is that the CPAN has a *lot* of dist's which
constitute a very large number of modules. Keeping them organized by a
semi-agreed-upon hierarchy of packages seems like a great
organizational tool.

---John


From robert.kern at gmail.com  Thu Mar  4 10:48:41 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 04 Mar 2010 09:48:41 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <hmn03d$5r6$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>
	<hmn03d$5r6$1@news.eternal-september.org>
Message-ID: <hmokoq$g74$1@dough.gmane.org>

On 2010-03-03 18:49 PM, Alf P. Steinbach wrote:
> * Robert Kern:
>> On 2010-03-03 15:35 PM, Alf P. Steinbach wrote:
>>> * Robert Kern:
>>>> On 2010-03-03 13:32 PM, Alf P. Steinbach wrote:
>>>>> * Robert Kern:
>>>>>> On 2010-03-03 11:18 AM, Alf P. Steinbach wrote:
>>>>>>> * Robert Kern:
>>>>>>>> On 2010-03-03 09:56 AM, Alf P. Steinbach wrote:
>>>>>>>>> * Mike Kent:
>>>>>>>>>> What's the compelling use case for this vs. a simple try/finally?
>>>>>>>>>
>>>>>>>>> if you thought about it you would mean a simple "try/else".
>>>>>>>>> "finally" is
>>>>>>>>> always executed. which is incorrect for cleanup
>>>>>>>>
>>>>>>>> Eh? Failed execution doesn't require cleanup? The example you
>>>>>>>> gave is
>>>>>>>> definitely equivalent to the try: finally: that Mike posted.
>>>>>>>
>>>>>>> Sorry, that's incorrect: it's not.
>>>>>>>
>>>>>>> With correct code (mine) cleanup for action A is only performed when
>>>>>>> action A succeeds.
>>>>>>>
>>>>>>> With incorrect code cleanup for action A is performed when A fails.
>>>>>>
>>>>>> Oh?
>>>>>>
>>>>>> $ cat cleanup.py
>>>>>>
>>>>>> class Cleanup:
>>>>>> def __init__( self ):
>>>>>> self._actions = []
>>>>>>
>>>>>> def call( self, action ):
>>>>>> assert( callable( action ) )
>>>>>> self._actions.append( action )
>>>>>>
>>>>>> def __enter__( self ):
>>>>>> return self
>>>>>>
>>>>>> def __exit__( self, x_type, x_value, x_traceback ):
>>>>>> while( len( self._actions ) != 0 ):
>>>>>> try:
>>>>>> self._actions.pop()()
>>>>>> except BaseException as x:
>>>>>> raise AssertionError( "Cleanup: exception during cleanup" )
>>>>>>
>>>>>> def print_(x):
>>>>>> print x
>>>>>>
>>>>>> with Cleanup() as at_cleanup:
>>>>>> at_cleanup.call(lambda: print_("Cleanup executed without an
>>>>>> exception."))
>>>>>>
>>>>>> with Cleanup() as at_cleanup:
>>>>>
>>>>> *Here* is where you should
>>>>>
>>>>> 1) Perform the action for which cleanup is needed.
>>>>>
>>>>> 2) Let it fail by raising an exception.
>>>>>
>>>>>
>>>>>> at_cleanup.call(lambda: print_("Cleanup execute with an exception."))
>>>>>> raise RuntimeError()
>>>>>
>>>>> With an exception raised here cleanup should of course be performed.
>>>>>
>>>>> And just in case you didn't notice: the above is not a test of the
>>>>> example I gave.
>>>>>
>>>>>
>>>>>> $ python cleanup.py
>>>>>> Cleanup executed without an exception.
>>>>>> Cleanup execute with an exception.
>>>>>> Traceback (most recent call last):
>>>>>> File "cleanup.py", line 28, in <module>
>>>>>> raise RuntimeError()
>>>>>> RuntimeError
>>>>>>
>>>>>>>> The actions are always executed in your example,
>>>>>>>
>>>>>>> Sorry, that's incorrect.
>>>>>>
>>>>>> Looks like it to me.
>>>>>
>>>>> I'm sorry, but you're
>>>>>
>>>>> 1) not testing my example which you're claiming that you're
>>>>> testing, and
>>>>
>>>> Then I would appreciate your writing a complete, runnable example that
>>>> demonstrates the feature you are claiming. Because it's apparently not
>>>> "ensur[ing] some desired cleanup at the end of a scope, even when the
>>>> scope is exited via an exception" that you talked about in your
>>>> original post.
>>>>
>>>> Your sketch of an example looks like mine:
>>>>
>>>> with Cleanup as at_cleanup:
>>>> # blah blah
>>>> chdir( somewhere )
>>>> at_cleanup.call( lambda: chdir( original_dir ) )
>>>> # blah blah
>>>>
>>>> The cleanup function gets registered immediately after the first
>>>> chdir() and before the second "blah blah". Even if an exception is
>>>> raised in the second "blah blah", then the cleanup function will still
>>>> run. This would be equivalent to a try: finally:
>>>>
>>>> # blah blah #1
>>>> chdir( somewhere )
>>>> try:
>>>> # blah blah #2
>>>> finally:
>>>> chdir( original_dir )
>>>
>>> Yes, this is equivalent code.
>>>
>>> The try-finally that you earlier claimed was equivalent, was not.
>>
>> Okay, but just because of the position of the chdir(), right?
>
> Yes, since it yields different results.
>
>>>> and not a try: else:
>>>>
>>>> # blah blah #1
>>>> chdir( somewhere )
>>>> try:
>>>> # blah blah #2
>>>> else:
>>>> chdir( original_dir )
>>>
>>> This example is however meaningless except as misdirection. There are
>>> infinitely many constructs that include try-finally and try-else, that
>>> the with-Cleanup code is not equivalent to. It's dumb to show one such.
>>>
>>> Exactly what are you trying to prove here?
>>
>> I'm just showing you what I thought you meant when you told Mike that
>> he should have used a try/else instead of try/finally.
>>
>>> Your earlier claims are still incorrect.
>>>
>>>> Now, I assumed that the behavior with respect to exceptions occurring
>>>> in the first "blah blah" weren't what you were talking about because
>>>> until the chdir(), there is nothing to clean up.
>>>>
>>>> There is no way that the example you gave translates to a try: else:
>>>> as you claimed in your response to Mike Kent.
>>>
>>> Of course there is.
>>>
>>> Note that Mike wrapped the action A within the 'try':
>>>
>>>
>>> <code author="Mike" correct="False">
>>> original_dir = os.getcwd()
>>> try:
>>> os.chdir(somewhere)
>>> # Do other stuff
>>> finally:
>>> os.chdir(original_dir)
>>> # Do other cleanup
>>> </code>
>>>
>>>
>>> The 'finally' he used, shown above, yields incorrect behavior.
>>>
>>> Namely cleanup always, while 'else', in that code, can yield correct
>>> behavior /provided/ that it's coded correctly:
>>>
>>>
>>> <code author="Alf" correct="ProbablyTrue" disclaimer="off the cuff">
>>> original_dir = os.getcwd()
>>> try:
>>> os.chdir(somewhere)
>>> except Whatever:
>>> # whatever, e.g. logging
>>> raise
>>> else:
>>> try:
>>> # Do other stuff
>>> finally:
>>> os.chdir(original_dir)
>>> # Do other cleanup
>>> </code>
>>
>> Ah, okay. Now we're getting somewhere. Now, please note that you did
>> not have any except: handling in your original example. So Mike made a
>> try: finally: example to attempt to match the semantics of your code.
>> When you tell him that he should 'mean a simple "try/else". "finally"
>> is always executed. which is incorrect for cleanup', can you
>> understand why we might think that you were saying that try: finally:
>> was wrong and that you were proposing that your code was equivalent to
>> some try: except: else: suite?
>
> No, not really. His code didn't match the semantics. Changing 'finally'
> to 'else' could make it equivalent.

Okay, please show me what you mean by "changing 'finally' to 'else'." I think 
you are being hinty again. It's not helpful. The most straightforward 
interpretation of those words means that you literally just want to remove the 
word 'finally' and replace it with 'else' in Mike's example. Obviously you don't 
mean that because it is a syntax error. try: else: is not a construct in Python. 
There is a try: except: else:, but there is no point to doing that if you don't 
have anything in the except: clause. Neither Mike's example nor your original 
one have any except: clause. Why do you think that we would interpret those 
words to mean that you wanted the example you give just above?

>>>>> 2) not even showing anything about your earlier statements, which were
>>>>> just incorrect.
>>>>>
>>>>> You're instead showing that my code works as it should for the case
>>>>> that
>>>>> you're testing, which is a bit unnecessary since I knew that, but
>>>>> thanks
>>>>> anyway.
>>>>
>>>> It's the case you seem to be talking about in your original post.
>>>
>>> What's this "seems"? Are you unable to read that very short post?
>>
>> I say "seems" because my understandings of what you meant in your
>> original post and your response to Mike disagreed with one another.
>> Now I see that your later posts were talking about minor discrepancy
>> about which errors you wanted caught by the finally: and which you
>> didn't.
>
> It's absolutely not a minor discrepancy whether some code is executed or
> not. It can have arbitrarily large effect. And from my point of view the
> discussion of that snippet has not been about what errors I "want"
> caught by the 'finally'; it's been about whether two snippets of code
> yield the same effect or not: Mike's code was incorrect not because it
> did something else, but because as code that did something else it was
> not an equivalent to the code that I posted.
>
>
>> I was confused because it seemed that you were saying that try:
>> finally: was completely wrong and that "try/else" was right. It
>> confused me and at least one other person.
>>
>>>> , but I do ask you to acknowledge that you originally were talking
>>>> about a feature that "ensure[s] some desired cleanup at the end of a
>>>> scope, even when the scope is exited via an exception."
>>>
>>> Yes, that's what it does.
>>>
>>> Which is I why I wrote that.
>>>
>>> This should not be hard to grok.
>>>
>>>
>>>> Do you acknowledge this?
>>>
>>> This seems like pure noise, to cover up that you were sputing a lot of
>>> incorrect statements earlier.
>>
>> No, I'm just trying to clarify what you are trying to say. The above
>> statement did not appear to accord with your later statement: 'if you
>> thought about it you would mean a simple "try/else". "finally" is
>> always executed. which is incorrect for cleanup.' It turns out that
>> what you really meant was that it would be incorrect for cleanup to be
>> executed when an error occurred in the chdir() itself.
>>
>> Now, I happen to disagree with that.
>
> Well, I was pretty unclear, almost hint-like, sorry about that, mea
> culpa, but you have it slightly wrong. You wrote then "The example you
> gave is definitely equivalent to the try: finally: that Mike posted."
> And it isn't.

I agree that it does behave differently with respect to when an exception is 
raised in chdir(). I was wrong on that point. I thought you were claiming that 
it behaved differently when there was an exception in the "# Do other stuff" 
block because you were being (and are still being) unclear.

>> There are a couple of ways to do this kind of cleanup depending on the
>> situation. Basically, you have several different code blocks:
>>
>> # 1. Record original state.
>> # 2. Modify state.
>> # 3. Do stuff requiring the modified state.
>> # 4. Revert to the original state.
>>
>> Depending on where errors are expected to occur, and how the state
>> needs to get modified and restored, there are different ways of
>> arranging these blocks. The one Mike showed:
>>
>> # 1. Record original state.
>> try:
>> # 2. Modify state.
>> # 3. Do stuff requiring the modified state.
>> finally:
>> # 4. Revert to the original state.
>>
>> And the one you prefer:
>>
>> # 1. Record original state.
>> # 2. Modify state.
>> try:
>> # 3. Do stuff requiring the modified state.
>> finally:
>> # 4. Revert to the original state.
>>
>> These differ in what happens when an error occurs in block #2, the
>> modification of the state. In Mike's, the cleanup code runs; in yours,
>> it doesn't. For chdir(), it really doesn't matter. Reverting to the
>> original state is harmless whether the original chdir() succeeds or
>> fails, and chdir() is essentially atomic so if it raises an exception,
>> the state did not change and nothing needs to be cleaned up.
>>
>> However, not all block #2s are atomic. Some are going to fail partway
>> through and need to be cleaned up even though they raised an
>> exception. Fortunately, cleanup can frequently be written to not care
>> whether the whole thing finished or not.
>
> Yeah, and there are some systematic ways to handle these things. You
> might look up Dave Abraham's levels of exception safety. Mostly his
> approach boils down to making operations effectively atomic so as to
> reduce the complexity: ideally, if an operation raises an exception,
> then it has undone any side effects.
>
> Of course it can't undo the launching of an ICBM, for example...
>
> But ideally, if it could, then it should.

I agree. Atomic operations like chdir() help a lot. But this is Python, and 
exceptions can happen in many different places. If you're not just calling an 
extension module function that makes a known-atomic system call, you run the 
risk of not having an atomic operation.

> If you call the possibly failing operation "A", then that systematic
> approach goes like this: if A fails, then it has cleaned up its own
> mess, but if A succeeds, then it's the responsibility of the calling
> code to clean up if the higher level (multiple statements) operation
> that A is embedded in, fails.
>
> And that's what Marginean's original C++ ScopeGuard was designed for,
> and what the corresponding Python Cleanup class is designed for.

And try: finally:, for that matter.

>> Both formulations can be correct (and both work perfectly fine with
>> the chdir() example being used). Sometimes one is better than the
>> other, and sometimes not. You can achieve both ways with either your
>> Cleanup class or with try: finally:.
>>
>> I am still of the opinion that Cleanup is not an improvement over try:
>> finally: and has the significant ugliness of forcing cleanup code into
>> callables. This significantly limits what you can do in your cleanup
>> code.
>
> Uhm, not really. :-) As I see it.

Well, not being able to affect the namespace is a significant limitation. 
Sometimes you need to delete objects from the namespace in order to ensure that 
their refcounts go to zero and their cleanup code gets executed. Tracebacks will 
keep the namespace alive and all objects in it.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From alfps at start.no  Thu Mar  4 10:48:41 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Thu, 04 Mar 2010 16:48:41 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.277.1267699818.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>
	<mailman.277.1267699818.23598.python-list@python.org>
Message-ID: <hmokot$uso$1@news.eternal-september.org>

* Jean-Michel Pichavant:
> Alf P. Steinbach wrote:
>>>  From your post, the scope guard technique is used "to ensure some 
>>> desired cleanup at the end of a scope, even when the scope is exited 
>>> via an exception." This is precisely what the try: finally: syntax is 
>>> for. 
>>
>> You'd have to nest it. That's ugly. And more importantly, now two 
>> people in this thread (namely you and Mike) have demonstrated that 
>> they do not grok the try functionality and manage to write incorrect 
>> code, even arguing that it's correct when informed that it's not, so 
>> it's a pretty fragile construct, like goto.
> 
> You want to execute some cleanup when things go wrong, use try except. 
> You want to do it when things go right, use try else. You want to 
> cleanup no matter what happen, use try finally.
> 
> There is no need of any Cleanup class, except for some technical 
> alternative  concern.

Have you considered that your argument applies to the "with" construct?

You have probably not realized that.

But let me force it on you: when would you use "with"?

Check if that case is covered by your argument above.

Now that you've been told about the "with" angle, don't you think it's a kind of 
weakness in your argument that it calls for removing "with" from the language?

I recommend that you think about why your argument is invalid.

Or, as I like to say, why your argument is completely bogus.


Cheers & hth.,

- Alf


From joe.hrbek at gmail.com  Thu Mar  4 10:57:18 2010
From: joe.hrbek at gmail.com (Sneaky Wombat)
Date: Thu, 4 Mar 2010 07:57:18 -0800 (PST)
Subject: loop over list and process into groups
Message-ID: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>

[ {'vlan_or_intf': 'VLAN2021'},
 {'vlan_or_intf': 'Interface'},
 {'vlan_or_intf': 'Po1'},
 {'vlan_or_intf': 'Po306'},
 {'vlan_or_intf': 'VLAN2022'},
 {'vlan_or_intf': 'Interface'},
 {'vlan_or_intf': 'Gi7/33'},
 {'vlan_or_intf': 'Po1'},
 {'vlan_or_intf': 'Po306'},
 {'vlan_or_intf': 'VLAN2051'},
 {'vlan_or_intf': 'Interface'},
 {'vlan_or_intf': 'Gi9/6'},
 {'vlan_or_intf': 'VLAN2052'},
 {'vlan_or_intf': 'Interface'},
 {'vlan_or_intf': 'Gi9/6'},]

I want it to be converted to:

[{'2021':['Po1','Po306']},{'2022':['Gi7/33','Po1','Po306']},etc etc]

I was going to write a def to loop through and look for certain pre-
compiled regexs, and then put them in a new dictionary and append to a
list, but I'm having trouble thinking of a good way to capture each
dictionary.  Each dictionary will have a key that is the vlan and the
value will be a list of interfaces that participate in that vlan.
Each list will be variable, many containing only one interface and
some containing many interfaces.

I thought about using itertools, but i only use that for fixed data.
I don't know of a good way to loop over variably sized data.  I was
wondering if anyone had any ideas about a good way to convert this
list or dictionary into the right format that I need.  The solution I
come up with will most likely be ugly and error prone, so I thought
i'd ask this python list while I work.  Hopefully I learn a better way
to solve this problem.

Thanks!

I also have the data in a list,

[ 'VLAN4065',
 'Interface',
 'Gi9/6',
 'Po2',
 'Po3',
 'Po306',
 'VLAN4068',
 'Interface',
 'Gi9/6',
 'VLAN4069',
 'Interface',
 'Gi9/6',]


From robert.kern at gmail.com  Thu Mar  4 11:04:02 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 04 Mar 2010 10:04:02 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <hmokot$uso$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>
	<hmokot$uso$1@news.eternal-september.org>
Message-ID: <hmolli$iii$1@dough.gmane.org>

On 2010-03-04 09:48 AM, Alf P. Steinbach wrote:
> * Jean-Michel Pichavant:
>> Alf P. Steinbach wrote:
>>>> From your post, the scope guard technique is used "to ensure some
>>>> desired cleanup at the end of a scope, even when the scope is exited
>>>> via an exception." This is precisely what the try: finally: syntax
>>>> is for.
>>>
>>> You'd have to nest it. That's ugly. And more importantly, now two
>>> people in this thread (namely you and Mike) have demonstrated that
>>> they do not grok the try functionality and manage to write incorrect
>>> code, even arguing that it's correct when informed that it's not, so
>>> it's a pretty fragile construct, like goto.
>>
>> You want to execute some cleanup when things go wrong, use try except.
>> You want to do it when things go right, use try else. You want to
>> cleanup no matter what happen, use try finally.
>>
>> There is no need of any Cleanup class, except for some technical
>> alternative concern.
>
> Have you considered that your argument applies to the "with" construct?
>
> You have probably not realized that.
>
> But let me force it on you: when would you use "with"?

When there is a specific context manager that removes the need for boilerplate.

> Check if that case is covered by your argument above.
>
> Now that you've been told about the "with" angle, don't you think it's a
> kind of weakness in your argument that it calls for removing "with" from
> the language?

No, it only argues that "with Cleanup():" is supernumerary.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From python at mrabarnett.plus.com  Thu Mar  4 11:14:01 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 04 Mar 2010 16:14:01 +0000
Subject: My four-yorkshireprogrammers contribution
In-Reply-To: <7v9e3rFl7mU1@mid.individual.net>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>	<4B8B9845.70604@sequans.com>	<mailman.59.1267456634.23598.python-list@python.org>	<7v695nFa0fU1@mid.individual.net>	<mailman.189.1267627321.23598.python-list@python.org>
	<7v9e3rFl7mU1@mid.individual.net>
Message-ID: <4B8FDC49.5070801@mrabarnett.plus.com>

Gregory Ewing wrote:
> MRAB wrote:
> 
>> Mk14 from Science of Cambridge, a kit with hex keypad and 7-segment
>> display, which I had to solder together, and also make my own power
>> supply. I had the extra RAM and the I/O chip, so that's 256B (including
>> the memory used by the monitor) + 256B additional RAM + 128B more in the
>> I/O chip.
> 
> Luxury! Mine was a Miniscamp, based on a design published in
> Electronics Australia in the 70s. 256 bytes RAM, 8 switches
> for input, 8 LEDs for output. No ROM -- program had to be
> toggled in each time.
> 
> Looked something like this:
> 
>   http://oldcomputermuseum.com/mini_scamp.html
> 
> except that mine wasn't built from a kit and didn't look
> quite as professional as that one.
> 
[snip]
By the standards of just a few years later, that's not so much a
microcomputer as a nanocomputer!

I was actually interested in electronics at the time, and it was such
things as Mk14 which lead me into computing.


From jeanmichel at sequans.com  Thu Mar  4 11:32:10 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Thu, 04 Mar 2010 17:32:10 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <hmokot$uso$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>
	<hmokot$uso$1@news.eternal-september.org>
Message-ID: <4B8FE08A.60005@sequans.com>

Alf P. Steinbach wrote:
> * Jean-Michel Pichavant:
>> Alf P. Steinbach wrote:
>>>>  From your post, the scope guard technique is used "to ensure some 
>>>> desired cleanup at the end of a scope, even when the scope is 
>>>> exited via an exception." This is precisely what the try: finally: 
>>>> syntax is for. 
>>>
>>> You'd have to nest it. That's ugly. And more importantly, now two 
>>> people in this thread (namely you and Mike) have demonstrated that 
>>> they do not grok the try functionality and manage to write incorrect 
>>> code, even arguing that it's correct when informed that it's not, so 
>>> it's a pretty fragile construct, like goto.
>>
>> You want to execute some cleanup when things go wrong, use try 
>> except. You want to do it when things go right, use try else. You 
>> want to cleanup no matter what happen, use try finally.
>>
>> There is no need of any Cleanup class, except for some technical 
>> alternative  concern.
>
> Have you considered that your argument applies to the "with" construct?
>
> You have probably not realized that.
>
> But let me force it on you: when would you use "with"?
>
> Check if that case is covered by your argument above.
>
> Now that you've been told about the "with" angle, don't you think it's 
> a kind of weakness in your argument that it calls for removing "with" 
> from the language?
>
> I recommend that you think about why your argument is invalid.
>
> Or, as I like to say, why your argument is completely bogus.
>
>
> Cheers & hth.,
>
> - Alf
I am using python 2.5, so I know nothing about the with statement, and 
it may possible my arguments apply to it, you could remove it from the 
language, it wouldn't bother me at all.
I just don't see in what you've written (adding a class, with some 
__entry__, __exit__ protocol, using a with statement) what cannot be 
achieved with a try statement in its simpliest form.

Try except may be lame and noobish, but it works, is easy to read and 
understood at first glance.
It looks like to me that 'with' statements are like decorators: 
overrated. Sometimes people could write simple readable code, but yet  
they're tempted by the geek side of programming: using complex 
constructs when there's no need to. I myself cannot resist sometimes ;-)

JM


From steve at holdenweb.com  Thu Mar  4 11:32:11 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 04 Mar 2010 11:32:11 -0500
Subject: How to login https sever with inputing account name and password?
In-Reply-To: <20100304103731.740AC40E@smtpcom.263xmail.com>
References: <20100304103731.740AC40E@smtpcom.263xmail.com>
Message-ID: <hmonae$q7s$1@dough.gmane.org>

Karen Wang wrote:
> Hi all,
> 
> I want to use python to access to https server, like
> ?https://212.218.229.10/chinatest/?
> 
> If open it from IE, will see the pop-up login windows like this
> 
> I tried several ways but always only get page for? HTTP Error 401.2 ?
> Unauthorized? error. ( myusername and mypassword are all correct)
> 
> Below is my code:
> 
> import urllib2
> 
> values = {
> 
>     'user' : "myusername",
> 
> ?pass' : "mypassword" }
> 
> data = urllib2.urlencode(values)
> 
> t = urllib2.urlopen('https://212.218.229.10/chinatest/',data)
> 
> print t.read()
> 
> where I am wrong ?
> 
Read the HTTP standard. The authentication data has to be send as HTTP
headers, not as the data to a POST request. The dialog box you see is
the browser attempting to collect the data it needs to put in the header.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From python at bdurham.com  Thu Mar  4 11:37:31 2010
From: python at bdurham.com (python at bdurham.com)
Date: Thu, 04 Mar 2010 11:37:31 -0500
Subject: My four-yorkshireprogrammers contribution
In-Reply-To: <4B8FDC49.5070801@mrabarnett.plus.com>
References: <20100224212303.242222c6@geekmail.INVALID>
	<eq4l57-okf2.ln1@ozzie.tundraware.com>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <7uu1ooFiipU1@mid.individual.net>
	<4B89D8BE.2040905@mrabarnett.plus.com> <4B8B9845.70604@sequans.com>
	<mailman.59.1267456634.23598.python-list@python.org>
	<7v695nFa0fU1@mid.individual.net>
	<mailman.189.1267627321.23598.python-list@python.org><7v9e3rFl7mU1@mid.individual.net>
	<4B8FDC49.5070801@mrabarnett.plus.com>
Message-ID: <1267720651.17005.1363119347@webmail.messagingengine.com>

Not to out do you guys, but over here in the states, I started out with
a Radio Shack 'computer' that consisted of 10 slideable switches and 10
flashlight bulbs. You ran wires betweens the slideable switches to
create 'programs'. Wish I could remember what this thing was called - my
google-fu fails me. This was approx 1976 when Popular Science's ELF-1
with 256 bytes was quite a sensation.

Cheers,
Malcolm


From magnicida at gmail.com  Thu Mar  4 11:51:21 2010
From: magnicida at gmail.com (Juan Pedro Bolivar Puente)
Date: Thu, 04 Mar 2010 18:51:21 +0200
Subject: NoSQL Movement?
In-Reply-To: <e0a86785-bb68-4977-8864-010ca4f71a6c@19g2000yqu.googlegroups.com>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<26bd4a5c-4d66-4597-a0ee-b4990f468e68@g26g2000yqn.googlegroups.com>
	<e0a86785-bb68-4977-8864-010ca4f71a6c@19g2000yqu.googlegroups.com>
Message-ID: <hmooea$uga$1@news.bytemine.net>

On 04/03/10 16:21, ccc31807 wrote:
> On Mar 3, 4:55 pm, toby <t... at telegraphics.com.au> wrote:
>>>  where you have to store data and
>>
>> "relational data"
> 
> Data is neither relational nor unrelational. Data is data.
> Relationships are an artifact, something we impose on the data.
> Relations are for human convenience, not something inherent in the
> data itself.
> 

No, relations are data. "Data is data" says nothing. Data is
information. Actually, all data are relations: relating /values/ to
/properties/ of /entities/. Relations as understood by the "relational
model" is nothing else but assuming that properties and entities are
first class values of the data system and the can also be related.

JP


From mrkafk at gmail.com  Thu Mar  4 11:55:10 2010
From: mrkafk at gmail.com (mk)
Date: Thu, 04 Mar 2010 17:55:10 +0100
Subject: loop over list and process into groups
In-Reply-To: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>
References: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>
Message-ID: <hmoole$1bv$1@dough.gmane.org>

Sneaky Wombat wrote:
> I was going to write a def to loop through and look for certain pre-
> compiled regexs, and then put them in a new dictionary and append to a
> list, 

regexes are overkill in this case I think.

> [ 'VLAN4065',
>  'Interface',
>  'Gi9/6',
>  'Po2',
>  'Po3',
>  'Po306',
>  'VLAN4068',
>  'Interface',
>  'Gi9/6',
>  'VLAN4069',
>  'Interface',
>  'Gi9/6',]

Why not construct an intermediate dictionary?

elems = [ 'VLAN4065',
  'Interface',
  'Gi9/6',
  'Po2',
  'Po3',
  'Po306',
  'VLAN4068',
  'Interface',
  'Gi9/6',
  'VLAN4069',
  'Interface',
  'Gi9/6',]

def makeintermdict(elems):
     vd = {}
     vlan = None
     for el in elems:
         if el.startswith('VLAN'):
             vlan = el.replace('VLAN','')
         elif el == 'Interface':
             vd[vlan] = []
         else:
             vd[vlan].append(el)
     return vd

def makelist(interm):
     finlist = []
     for k in interm.keys():
         finlist.append({k:interm[k]})
     return finlist

if __name__ == "__main__":
     intermediate = makeintermdict(elems)
     print intermediate
     finlist = makelist(intermediate)
     print 'final', finlist


{'4068': ['Gi9/6'], '4069': ['Gi9/6'], '4065': ['Gi9/6', 'Po2', 'Po3', 
'Po306']}
final [{'4068': ['Gi9/6']}, {'4069': ['Gi9/6']}, {'4065': ['Gi9/6', 
'Po2', 'Po3', 'Po306']}]

I hope this is not your homework. :-)

Regards,
mk



From alfps at start.no  Thu Mar  4 11:56:34 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Thu, 04 Mar 2010 17:56:34 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.292.1267717742.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>	<hmn03d$5r6$1@news.eternal-september.org>
	<mailman.292.1267717742.23598.python-list@python.org>
Message-ID: <hmooo6$pg0$1@news.eternal-september.org>

* Robert Kern:
> On 2010-03-03 18:49 PM, Alf P. Steinbach wrote:
>> * Robert Kern:
[snip]
>>>  can you
>>> understand why we might think that you were saying that try: finally:
>>> was wrong and that you were proposing that your code was equivalent to
>>> some try: except: else: suite?
>>
>> No, not really. His code didn't match the semantics. Changing 'finally'
>> to 'else' could make it equivalent.
> 
> Okay, please show me what you mean by "changing 'finally' to 'else'." I 
> think you are being hinty again. It's not helpful.  
[snip middle of this paragraph]
> Why do you think that we would interpret those words 
> to mean that you wanted the example you give just above?

There's an apparent discrepancy between your call for an example and your 
subsequent (in the same paragraph) reference to the example given.

But as to why I assumed that that example, or a similar correct one, would be 
implied, it's the only meaningful interpretation.

Adopting a meaningless interpretation when a meaningful exists is generally just 
adversarial, but in this case I was, as you pointed out, extremely unclear, and 
I'm sorry: I should have given such example up front. Will try to do so.


[snip]
> 
>>> There are a couple of ways to do this kind of cleanup depending on the
>>> situation. Basically, you have several different code blocks:
>>>
>>> # 1. Record original state.
>>> # 2. Modify state.
>>> # 3. Do stuff requiring the modified state.
>>> # 4. Revert to the original state.
>>>
>>> Depending on where errors are expected to occur, and how the state
>>> needs to get modified and restored, there are different ways of
>>> arranging these blocks. The one Mike showed:
>>>
>>> # 1. Record original state.
>>> try:
>>> # 2. Modify state.
>>> # 3. Do stuff requiring the modified state.
>>> finally:
>>> # 4. Revert to the original state.
>>>
>>> And the one you prefer:
>>>
>>> # 1. Record original state.
>>> # 2. Modify state.
>>> try:
>>> # 3. Do stuff requiring the modified state.
>>> finally:
>>> # 4. Revert to the original state.
>>>
>>> These differ in what happens when an error occurs in block #2, the
>>> modification of the state. In Mike's, the cleanup code runs; in yours,
>>> it doesn't. For chdir(), it really doesn't matter. Reverting to the
>>> original state is harmless whether the original chdir() succeeds or
>>> fails, and chdir() is essentially atomic so if it raises an exception,
>>> the state did not change and nothing needs to be cleaned up.
>>>
>>> However, not all block #2s are atomic. Some are going to fail partway
>>> through and need to be cleaned up even though they raised an
>>> exception. Fortunately, cleanup can frequently be written to not care
>>> whether the whole thing finished or not.
>>
>> Yeah, and there are some systematic ways to handle these things. You
>> might look up Dave Abraham's levels of exception safety. Mostly his
>> approach boils down to making operations effectively atomic so as to
>> reduce the complexity: ideally, if an operation raises an exception,
>> then it has undone any side effects.
>>
>> Of course it can't undo the launching of an ICBM, for example...
>>
>> But ideally, if it could, then it should.
> 
> I agree. Atomic operations like chdir() help a lot. But this is Python, 
> and exceptions can happen in many different places. If you're not just 
> calling an extension module function that makes a known-atomic system 
> call, you run the risk of not having an atomic operation.
> 
>> If you call the possibly failing operation "A", then that systematic
>> approach goes like this: if A fails, then it has cleaned up its own
>> mess, but if A succeeds, then it's the responsibility of the calling
>> code to clean up if the higher level (multiple statements) operation
>> that A is embedded in, fails.
>>
>> And that's what Marginean's original C++ ScopeGuard was designed for,
>> and what the corresponding Python Cleanup class is designed for.
> 
> And try: finally:, for that matter.

Not to mention "with".

Some other poster made the same error recently in this thread; it is a common 
fallacy in discussions about programming, to assume that since the same can be 
expressed using lower level constructs, those are all that are required.

If adopted as true it ultimately means the removal of all control structures 
above the level of "if" and "goto" (except Python doesn't have "goto").


>>> Both formulations can be correct (and both work perfectly fine with
>>> the chdir() example being used). Sometimes one is better than the
>>> other, and sometimes not. You can achieve both ways with either your
>>> Cleanup class or with try: finally:.
>>>
>>> I am still of the opinion that Cleanup is not an improvement over try:
>>> finally: and has the significant ugliness of forcing cleanup code into
>>> callables. This significantly limits what you can do in your cleanup
>>> code.
>>
>> Uhm, not really. :-) As I see it.
> 
> Well, not being able to affect the namespace is a significant 
> limitation. Sometimes you need to delete objects from the namespace in 
> order to ensure that their refcounts go to zero and their cleanup code 
> gets executed.

Just a nit (I agree that a lambda can't do this, but as to what's required): 
assigning None is sufficient for that[1].

However, note that the current language doesn't guarantee such cleanup, at least 
as far as I know.

So while it's good practice to support it, to do everything to let it happen, 
it's presumably bad practice to rely on it happening.


> Tracebacks will keep the namespace alive and all objects 
> in it.

Thanks!, I hadn't thought of connecting that to general cleanup actions.

It limits the use of general "with" in the same way.


Cheers,

- Alf

Notes:
[1] An 'except' clause deletes variables, but since it has no knowledge of the 
code it's placed in the only alternatives would be a presumably costly check of 
prior existence, or letting it pollute the namespace.


From robert.kern at gmail.com  Thu Mar  4 12:00:32 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 04 Mar 2010 11:00:32 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <4B8FE08A.60005@sequans.com>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>	<hmokot$uso$1@news.eternal-september.org>
	<4B8FE08A.60005@sequans.com>
Message-ID: <hmoovi$322$1@dough.gmane.org>

On 2010-03-04 10:32 AM, Jean-Michel Pichavant wrote:
> Alf P. Steinbach wrote:
>> * Jean-Michel Pichavant:
>>> Alf P. Steinbach wrote:
>>>>> From your post, the scope guard technique is used "to ensure some
>>>>> desired cleanup at the end of a scope, even when the scope is
>>>>> exited via an exception." This is precisely what the try: finally:
>>>>> syntax is for.
>>>>
>>>> You'd have to nest it. That's ugly. And more importantly, now two
>>>> people in this thread (namely you and Mike) have demonstrated that
>>>> they do not grok the try functionality and manage to write incorrect
>>>> code, even arguing that it's correct when informed that it's not, so
>>>> it's a pretty fragile construct, like goto.
>>>
>>> You want to execute some cleanup when things go wrong, use try
>>> except. You want to do it when things go right, use try else. You
>>> want to cleanup no matter what happen, use try finally.
>>>
>>> There is no need of any Cleanup class, except for some technical
>>> alternative concern.
>>
>> Have you considered that your argument applies to the "with" construct?
>>
>> You have probably not realized that.
>>
>> But let me force it on you: when would you use "with"?
>>
>> Check if that case is covered by your argument above.
>>
>> Now that you've been told about the "with" angle, don't you think it's
>> a kind of weakness in your argument that it calls for removing "with"
>> from the language?
>>
>> I recommend that you think about why your argument is invalid.
>>
>> Or, as I like to say, why your argument is completely bogus.
>>
>>
>> Cheers & hth.,
>>
>> - Alf
> I am using python 2.5, so I know nothing about the with statement,

You can try it out using "from __future__ import with_statement".

> and
> it may possible my arguments apply to it, you could remove it from the
> language, it wouldn't bother me at all.
> I just don't see in what you've written (adding a class, with some
> __entry__, __exit__ protocol, using a with statement) what cannot be
> achieved with a try statement in its simpliest form.
>
> Try except may be lame and noobish, but it works, is easy to read and
> understood at first glance.
> It looks like to me that 'with' statements are like decorators:
> overrated. Sometimes people could write simple readable code, but yet
> they're tempted by the geek side of programming: using complex
> constructs when there's no need to. I myself cannot resist sometimes ;-)

PEP 343 is a good introduction to the real uses of the with: statement.

   http://www.python.org/dev/peps/pep-0343/

Basically, it allows you to package up your initialization and cleanup code into 
objects, stick them in your library, unit test them thoroughly, etc. so you 
don't have to repeat them everywhere and possibly get them wrong. It's DRY in 
action.

Where Alf's Cleanup class goes wrong, in my opinion, is that it does not package 
up any code to avoid repetition. You still repeat the same cleanup code 
everywhere you use it, so it is no better than try: finally:. It is not a real 
use case of the with: statement.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From alfps at start.no  Thu Mar  4 12:02:23 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Thu, 04 Mar 2010 18:02:23 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.293.1267718664.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>	<hmokot$uso$1@news.eternal-september.org>
	<mailman.293.1267718664.23598.python-list@python.org>
Message-ID: <hmop33$rrj$1@news.eternal-september.org>

* Robert Kern:
> On 2010-03-04 09:48 AM, Alf P. Steinbach wrote:
>> * Jean-Michel Pichavant:
>>> Alf P. Steinbach wrote:
>>>>> From your post, the scope guard technique is used "to ensure some
>>>>> desired cleanup at the end of a scope, even when the scope is exited
>>>>> via an exception." This is precisely what the try: finally: syntax
>>>>> is for.
>>>>
>>>> You'd have to nest it. That's ugly. And more importantly, now two
>>>> people in this thread (namely you and Mike) have demonstrated that
>>>> they do not grok the try functionality and manage to write incorrect
>>>> code, even arguing that it's correct when informed that it's not, so
>>>> it's a pretty fragile construct, like goto.
>>>
>>> You want to execute some cleanup when things go wrong, use try except.
>>> You want to do it when things go right, use try else. You want to
>>> cleanup no matter what happen, use try finally.
>>>
>>> There is no need of any Cleanup class, except for some technical
>>> alternative concern.
>>
>> Have you considered that your argument applies to the "with" construct?
>>
>> You have probably not realized that.
>>
>> But let me force it on you: when would you use "with"?
> 
> When there is a specific context manager that removes the need for 
> boilerplate.

That's "cleanup no matter what happen".


>> Check if that case is covered by your argument above.
>>
>> Now that you've been told about the "with" angle, don't you think it's a
>> kind of weakness in your argument that it calls for removing "with" from
>> the language?
> 
> No, it only argues that "with Cleanup():" is supernumerary.

I don't know what "supernumerary" means, but to the degree that the argument 
says anything about a construct that is not 'finally', it says the same about 
general "with".

So whatever you mean by supernumerary, you're saying that the argument implies 
that "with" is supernumerary.

This is starting to look like some earlier discussions in this group, where even 
basic logic is denied.


Cheers,

- Alf


From robert.kern at gmail.com  Thu Mar  4 12:20:20 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 04 Mar 2010 11:20:20 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <hmooo6$pg0$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>	<hmn03d$5r6$1@news.eternal-september.org>	<mailman.292.1267717742.23598.python-list@python.org>
	<hmooo6$pg0$1@news.eternal-september.org>
Message-ID: <hmoq4m$8e5$1@dough.gmane.org>

On 2010-03-04 10:56 AM, Alf P. Steinbach wrote:
> * Robert Kern:
>> On 2010-03-03 18:49 PM, Alf P. Steinbach wrote:
>>> * Robert Kern:
> [snip]
>>>> can you
>>>> understand why we might think that you were saying that try: finally:
>>>> was wrong and that you were proposing that your code was equivalent to
>>>> some try: except: else: suite?
>>>
>>> No, not really. His code didn't match the semantics. Changing 'finally'
>>> to 'else' could make it equivalent.
>>
>> Okay, please show me what you mean by "changing 'finally' to 'else'."
>> I think you are being hinty again. It's not helpful.
> [snip middle of this paragraph]
>> Why do you think that we would interpret those words to mean that you
>> wanted the example you give just above?
>
> There's an apparent discrepancy between your call for an example and
> your subsequent (in the same paragraph) reference to the example given.
>
> But as to why I assumed that that example, or a similar correct one,
> would be implied, it's the only meaningful interpretation.
>
> Adopting a meaningless interpretation when a meaningful exists is
> generally just adversarial, but in this case I was, as you pointed out,
> extremely unclear, and I'm sorry: I should have given such example up
> front. Will try to do so.

Thank you. I appreciate it.

> [snip]
>>
>>>> There are a couple of ways to do this kind of cleanup depending on the
>>>> situation. Basically, you have several different code blocks:
>>>>
>>>> # 1. Record original state.
>>>> # 2. Modify state.
>>>> # 3. Do stuff requiring the modified state.
>>>> # 4. Revert to the original state.
>>>>
>>>> Depending on where errors are expected to occur, and how the state
>>>> needs to get modified and restored, there are different ways of
>>>> arranging these blocks. The one Mike showed:
>>>>
>>>> # 1. Record original state.
>>>> try:
>>>> # 2. Modify state.
>>>> # 3. Do stuff requiring the modified state.
>>>> finally:
>>>> # 4. Revert to the original state.
>>>>
>>>> And the one you prefer:
>>>>
>>>> # 1. Record original state.
>>>> # 2. Modify state.
>>>> try:
>>>> # 3. Do stuff requiring the modified state.
>>>> finally:
>>>> # 4. Revert to the original state.
>>>>
>>>> These differ in what happens when an error occurs in block #2, the
>>>> modification of the state. In Mike's, the cleanup code runs; in yours,
>>>> it doesn't. For chdir(), it really doesn't matter. Reverting to the
>>>> original state is harmless whether the original chdir() succeeds or
>>>> fails, and chdir() is essentially atomic so if it raises an exception,
>>>> the state did not change and nothing needs to be cleaned up.
>>>>
>>>> However, not all block #2s are atomic. Some are going to fail partway
>>>> through and need to be cleaned up even though they raised an
>>>> exception. Fortunately, cleanup can frequently be written to not care
>>>> whether the whole thing finished or not.
>>>
>>> Yeah, and there are some systematic ways to handle these things. You
>>> might look up Dave Abraham's levels of exception safety. Mostly his
>>> approach boils down to making operations effectively atomic so as to
>>> reduce the complexity: ideally, if an operation raises an exception,
>>> then it has undone any side effects.
>>>
>>> Of course it can't undo the launching of an ICBM, for example...
>>>
>>> But ideally, if it could, then it should.
>>
>> I agree. Atomic operations like chdir() help a lot. But this is
>> Python, and exceptions can happen in many different places. If you're
>> not just calling an extension module function that makes a
>> known-atomic system call, you run the risk of not having an atomic
>> operation.
>>
>>> If you call the possibly failing operation "A", then that systematic
>>> approach goes like this: if A fails, then it has cleaned up its own
>>> mess, but if A succeeds, then it's the responsibility of the calling
>>> code to clean up if the higher level (multiple statements) operation
>>> that A is embedded in, fails.
>>>
>>> And that's what Marginean's original C++ ScopeGuard was designed for,
>>> and what the corresponding Python Cleanup class is designed for.
>>
>> And try: finally:, for that matter.
>
> Not to mention "with".
>
> Some other poster made the same error recently in this thread; it is a
> common fallacy in discussions about programming, to assume that since
> the same can be expressed using lower level constructs, those are all
> that are required.
>
> If adopted as true it ultimately means the removal of all control
> structures above the level of "if" and "goto" (except Python doesn't
> have "goto").

What I'm trying to explain is that the with: statement has a use even if Cleanup 
doesn't. Arguing that Cleanup doesn't improve on try: finally: does not mean 
that the with: statement doesn't improve on try: finally:.

>>>> Both formulations can be correct (and both work perfectly fine with
>>>> the chdir() example being used). Sometimes one is better than the
>>>> other, and sometimes not. You can achieve both ways with either your
>>>> Cleanup class or with try: finally:.
>>>>
>>>> I am still of the opinion that Cleanup is not an improvement over try:
>>>> finally: and has the significant ugliness of forcing cleanup code into
>>>> callables. This significantly limits what you can do in your cleanup
>>>> code.
>>>
>>> Uhm, not really. :-) As I see it.
>>
>> Well, not being able to affect the namespace is a significant
>> limitation. Sometimes you need to delete objects from the namespace in
>> order to ensure that their refcounts go to zero and their cleanup code
>> gets executed.
>
> Just a nit (I agree that a lambda can't do this, but as to what's
> required): assigning None is sufficient for that[1].

Yes, but no callable is going to allow you to assign None to names in that 
namespace, either. Not without sys._getframe() hackery, in any case.

> However, note that the current language doesn't guarantee such cleanup,
> at least as far as I know.
>
> So while it's good practice to support it, to do everything to let it
> happen, it's presumably bad practice to rely on it happening.
>
>
>> Tracebacks will keep the namespace alive and all objects in it.
>
> Thanks!, I hadn't thought of connecting that to general cleanup actions.
>
> It limits the use of general "with" in the same way.

Not really. It's easy to write context managers that do that. You put the 
initialization code in the __enter__() method, assign whatever objects you want 
to keep around through the with: clause as attributes on the manager, then 
delete those attributes in the __exit__(). Or, you use the @contextmanager 
decorator to turn a generator into a context manager, and you just assign to 
local variables and del them in the finally: clause.

What you can't do is write a generic context manager where the initialization 
happens inside the with: clause and the cleanup actions are registered 
callables. That does not allow you to affect the namespace.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From lbolla at gmail.com  Thu Mar  4 12:29:46 2010
From: lbolla at gmail.com (lbolla)
Date: Thu, 4 Mar 2010 09:29:46 -0800 (PST)
Subject: memory usage, temporary and otherwise
References: <mailman.220.1267642060.23598.python-list@python.org> 
	<Xns9D317E4A4CAD5duncanbooth@127.0.0.1>
Message-ID: <41c42ec5-1939-48f8-84e3-b8748161b524@g28g2000yqh.googlegroups.com>

On Mar 4, 12:24?pm, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
>
> ?>>> a={}
> ?>>> for i in range(10000000):
> ... ? ? a[i]=intern('spam'*10)
>

"intern": another name borrowed from Lisp?


From robert.kern at gmail.com  Thu Mar  4 12:30:03 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 04 Mar 2010 11:30:03 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <hmop33$rrj$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>	<hmokot$uso$1@news.eternal-september.org>	<mailman.293.1267718664.23598.python-list@python.org>
	<hmop33$rrj$1@news.eternal-september.org>
Message-ID: <hmoqmr$akt$1@dough.gmane.org>

On 2010-03-04 11:02 AM, Alf P. Steinbach wrote:
> * Robert Kern:
>> On 2010-03-04 09:48 AM, Alf P. Steinbach wrote:
>>> * Jean-Michel Pichavant:
>>>> Alf P. Steinbach wrote:
>>>>>> From your post, the scope guard technique is used "to ensure some
>>>>>> desired cleanup at the end of a scope, even when the scope is exited
>>>>>> via an exception." This is precisely what the try: finally: syntax
>>>>>> is for.
>>>>>
>>>>> You'd have to nest it. That's ugly. And more importantly, now two
>>>>> people in this thread (namely you and Mike) have demonstrated that
>>>>> they do not grok the try functionality and manage to write incorrect
>>>>> code, even arguing that it's correct when informed that it's not, so
>>>>> it's a pretty fragile construct, like goto.
>>>>
>>>> You want to execute some cleanup when things go wrong, use try except.
>>>> You want to do it when things go right, use try else. You want to
>>>> cleanup no matter what happen, use try finally.
>>>>
>>>> There is no need of any Cleanup class, except for some technical
>>>> alternative concern.
>>>
>>> Have you considered that your argument applies to the "with" construct?
>>>
>>> You have probably not realized that.
>>>
>>> But let me force it on you: when would you use "with"?
>>
>> When there is a specific context manager that removes the need for
>> boilerplate.
>
> That's "cleanup no matter what happen".

For the "# Do stuff" block, yes. For the initialization block, you can write a 
context manager to do it either way, as necessary.

>>> Check if that case is covered by your argument above.
>>>
>>> Now that you've been told about the "with" angle, don't you think it's a
>>> kind of weakness in your argument that it calls for removing "with" from
>>> the language?
>>
>> No, it only argues that "with Cleanup():" is supernumerary.
>
> I don't know what "supernumerary" means,

http://www.merriam-webster.com/dictionary/supernumerary

> but to the degree that the
> argument says anything about a construct that is not 'finally', it says
> the same about general "with".

He's ignorant of the use cases of the with: statement, true. Given only your 
example of the with: statement, it is hard to fault him for thinking that try: 
finally: wouldn't suffice.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From joe.hrbek at gmail.com  Thu Mar  4 12:41:45 2010
From: joe.hrbek at gmail.com (Sneaky Wombat)
Date: Thu, 4 Mar 2010 09:41:45 -0800 (PST)
Subject: loop over list and process into groups
References: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>
	<mailman.298.1267721732.23598.python-list@python.org>
Message-ID: <f060c85b-ff10-4d19-a7f7-6abf26ce371e@t23g2000yqt.googlegroups.com>

On Mar 4, 10:55?am, mk <mrk... at gmail.com> wrote:
> Sneaky Wombat wrote:
> > I was going to write a def to loop through and look for certain pre-
> > compiled regexs, and then put them in a new dictionary and append to a
> > list,
>
> regexes are overkill in this case I think.
>
> > [ 'VLAN4065',
> > ?'Interface',
> > ?'Gi9/6',
> > ?'Po2',
> > ?'Po3',
> > ?'Po306',
> > ?'VLAN4068',
> > ?'Interface',
> > ?'Gi9/6',
> > ?'VLAN4069',
> > ?'Interface',
> > ?'Gi9/6',]
>
> Why not construct an intermediate dictionary?
>
> elems = [ 'VLAN4065',
> ? 'Interface',
> ? 'Gi9/6',
> ? 'Po2',
> ? 'Po3',
> ? 'Po306',
> ? 'VLAN4068',
> ? 'Interface',
> ? 'Gi9/6',
> ? 'VLAN4069',
> ? 'Interface',
> ? 'Gi9/6',]
>
> def makeintermdict(elems):
> ? ? ?vd = {}
> ? ? ?vlan = None
> ? ? ?for el in elems:
> ? ? ? ? ?if el.startswith('VLAN'):
> ? ? ? ? ? ? ?vlan = el.replace('VLAN','')
> ? ? ? ? ?elif el == 'Interface':
> ? ? ? ? ? ? ?vd[vlan] = []
> ? ? ? ? ?else:
> ? ? ? ? ? ? ?vd[vlan].append(el)
> ? ? ?return vd
>
> def makelist(interm):
> ? ? ?finlist = []
> ? ? ?for k in interm.keys():
> ? ? ? ? ?finlist.append({k:interm[k]})
> ? ? ?return finlist
>
> if __name__ == "__main__":
> ? ? ?intermediate = makeintermdict(elems)
> ? ? ?print intermediate
> ? ? ?finlist = makelist(intermediate)
> ? ? ?print 'final', finlist
>
> {'4068': ['Gi9/6'], '4069': ['Gi9/6'], '4065': ['Gi9/6', 'Po2', 'Po3',
> 'Po306']}
> final [{'4068': ['Gi9/6']}, {'4069': ['Gi9/6']}, {'4065': ['Gi9/6',
> 'Po2', 'Po3', 'Po306']}]
>
> I hope this is not your homework. :-)
>
> Regards,
> mk

Thanks mk,

My approach was a lot more complex than yours, but your's is better.
I like itertools and was using islice to create tuples for (start,end)
string slicing.  Too much work though.  Thanks!

-j


From gneuner2 at comcast.net  Thu Mar  4 12:44:23 2010
From: gneuner2 at comcast.net (George Neuner)
Date: Thu, 04 Mar 2010 12:44:23 -0500
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<26bd4a5c-4d66-4597-a0ee-b4990f468e68@g26g2000yqn.googlegroups.com>
	<e0a86785-bb68-4977-8864-010ca4f71a6c@19g2000yqu.googlegroups.com>
	<hmooea$uga$1@news.bytemine.net>
Message-ID: <6iqvo5hvlnpci5oi5rgs1ohpj085s12o6n@4ax.com>

On Thu, 04 Mar 2010 18:51:21 +0200, Juan Pedro Bolivar Puente
<magnicida at gmail.com> wrote:

>On 04/03/10 16:21, ccc31807 wrote:
>> On Mar 3, 4:55 pm, toby <t... at telegraphics.com.au> wrote:
>>>>  where you have to store data and
>>>
>>> "relational data"
>> 
>> Data is neither relational nor unrelational. Data is data.
>> Relationships are an artifact, something we impose on the data.
>> Relations are for human convenience, not something inherent in the
>> data itself.
>> 
>
>No, relations are data. "Data is data" says nothing. Data is
>information. Actually, all data are relations: relating /values/ to
>/properties/ of /entities/. Relations as understood by the "relational
>model" is nothing else but assuming that properties and entities are
>first class values of the data system and the can also be related.

Well ... sort of.  Information is not data but rather the
understanding of something represented by the data.  The term
"information overload" is counter-intuitive ... it really means an
excess of data for which there is little understanding.

Similarly, at the level to which you are referring, a relation is not
data but simply a theoretical construct.  At this level testable
properties or instances of the relation are data, but the relation
itself is not.  The relation may be data at a higher level.

George


From spamfresser at ch3ka.de  Thu Mar  4 12:50:32 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Thu, 04 Mar 2010 18:50:32 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.300.1267723245.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>	<hmn03d$5r6$1@news.eternal-september.org>	<mailman.292.1267717742.23598.python-list@python.org>	<hmooo6$pg0$1@news.eternal-september.org>
	<mailman.300.1267723245.23598.python-list@python.org>
Message-ID: <hmortf$fbj$1@news.urz.uni-heidelberg.de>

Am 04.03.2010 18:20, schrieb Robert Kern:
>
> What I'm trying to explain is that the with: statement has a use even if
> Cleanup doesn't. Arguing that Cleanup doesn't improve on try: finally:
> does not mean that the with: statement doesn't improve on try: finally:.

Yes, the with-statement rocks :)

I suggested such a thing a few days ago in another thread, where OP 
wanted a "silent" keyword like:

silent:
	do_stuff()

would be equivalent to:
try: do_stuff() except: pass

Of course catching *all* exceptions was a bad idea, so I came up with 
the code below and now I actually like it and use it myself :)

---------snip---------
To your first question about a "silenced" keyword: you could emulate 
this with context managers I guess.

Something like (untested, just a quick mockup how it could look):



class silenced:
     def __init__(self, *silenced):
         self.exceptions=tuple(silenced) #just to be explicit
     def __enter__(self):
         return self            #dito
     def __exit__(self, type, value, traceback):
         for ex in self.exceptions:
             if isinstance(value, ex):
                 return True #supresses exception


So:

with silenced(os.Error):
     os.remove(somefile)

Would translate to:

try:
     os.remove(somefile)
except os.Error:
     pass

One nice thing about this approach would be that you can alias a set of 
exceptions with this:

idontcareabouttheseerrors=silenced(TypeError, ValueError, PEBCAKError, 
SyntaxError, EndOfWorldError, 1D10T_Error)

with idontcareabouttheseerrors:
     do_stuff()

Regards,
Michael


From cartercc at gmail.com  Thu Mar  4 12:52:06 2010
From: cartercc at gmail.com (ccc31807)
Date: Thu, 4 Mar 2010 09:52:06 -0800 (PST)
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com> 
	<26bd4a5c-4d66-4597-a0ee-b4990f468e68@g26g2000yqn.googlegroups.com> 
	<e0a86785-bb68-4977-8864-010ca4f71a6c@19g2000yqu.googlegroups.com> 
	<hmooea$uga$1@news.bytemine.net>
Message-ID: <7bfeffcd-722e-4df4-8455-7710207d9c7e@a18g2000yqc.googlegroups.com>

On Mar 4, 11:51?am, Juan Pedro Bolivar Puente <magnic... at gmail.com>
wrote:
> No, relations are data.

This depends on your definition of 'data.' I would say that
relationships is information gleaned from the data.

> "Data is data" says nothing. Data is
> information.

To me, data and information are not the same thing, and in particular,
data is NOT information. To me, information consists of the sifting,
sorting, filtering, and rearrangement of data that can be useful in
completing some task. As an illustration, consider some very large
collection of ones and zeros -- the information it contains depends on
whether it's views as a JPEG, an EXE, XML, WAV, or other sort of
information processing device. Whichever way it's processed, the
'data' (the ones and zeros) stay the same, and do not constitute
'information' in their raw state.

> Actually, all data are relations: relating /values/ to
> /properties/ of /entities/. Relations as understood by the "relational
> model" is nothing else but assuming that properties and entities are
> first class values of the data system and the can also be related.

Well, this sort of illustrates my point. The 'values' of 'properties'
relating to specific 'entities' depends on how one processes the data,
which can be processed various ways. For example, 10000001 can either
be viewed as the decimal number 65 or the alpha character 'A' but the
decision as to how to view this value isn't inherent in the data
itself, but only as an artifact of our use of the data to turn it into
information.

CC.


From spamfresser at ch3ka.de  Thu Mar  4 12:55:18 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Thu, 04 Mar 2010 18:55:18 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.295.1267720340.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>	<hmokot$uso$1@news.eternal-september.org>
	<mailman.295.1267720340.23598.python-list@python.org>
Message-ID: <hmos6c$fca$1@news.urz.uni-heidelberg.de>

Am 04.03.2010 17:32, schrieb Jean-Michel Pichavant:
> It looks like to me that 'with' statements are like decorators: overrated.

Oh no, you just insulted my favourite two python features, followed 
immediately by generators, iterators and list comprehensions / generator 
expressions :p

No, really: they *are* great ;D

Regards,
Michael


From gnewsg at gmail.com  Thu Mar  4 12:57:40 2010
From: gnewsg at gmail.com (Giampaolo Rodola')
Date: Thu, 4 Mar 2010 09:57:40 -0800 (PST)
Subject: ANN: psutil 0.1.3 released
Message-ID: <39a8f505-2caa-4592-a359-9731e20002eb@y17g2000yqd.googlegroups.com>

Hi,
I'm pleased to announce the 0.1.3 release of psutil:
http://code.google.com/p/psutil

=== About ===

psutil is a module providing an interface for retrieving information
on running processes and system utilization (CPU, memory) in a
portable way by using Python, implementing many functionalities
offered by tools like ps, top and Windows task manager.

It currently supports Linux, OS X, FreeBSD and Windows with Python
versions from 2.4 to 3.1 by using a unique code base.

=== Major enhancements ===

 * Python 3 support
 * per-process username
 * suspend / resume process
 * per-process current working directory (Windows and Linux only)
 * added support for Windows 7 and FreeBSD 64 bit

=== Links ===

* Home page: http://code.google.com/p/psutil
* Mailing list: http://groups.google.com/group/psutil/topics
* Source tarball: http://psutil.googlecode.com/files/psutil-0.1.3.tar.gz
* OS X installer: http://psutil.googlecode.com/files/psutil-0.1.3-py2.6-macosx10.4.dmg
* Windows Installer (Python 2.6): http://psutil.googlecode.com/files/psutil-0.1.3.win32-py2.6.exe
* Windows Installer (Python 3.1): http://psutil.googlecode.com/files/psutil-0.1.3.win32-py3.1.exe
* Api Reference: http://code.google.com/p/psutil/wiki/Documentation


Thanks

--- Giampaolo Rodola'
http://code.google.com/p/pyftpdlib
http://code.google.com/p/psutil/


From lbolla at gmail.com  Thu Mar  4 12:59:21 2010
From: lbolla at gmail.com (lbolla)
Date: Thu, 4 Mar 2010 09:59:21 -0800 (PST)
Subject: loop over list and process into groups
References: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>
Message-ID: <5e9126f7-f9e2-4c38-8dd5-dc174204fd71@d27g2000yqf.googlegroups.com>

On Mar 4, 3:57?pm, Sneaky Wombat <joe.hr... at gmail.com> wrote:
> [ {'vlan_or_intf': 'VLAN2021'},
> ?{'vlan_or_intf': 'Interface'},
> ?{'vlan_or_intf': 'Po1'},
> ?{'vlan_or_intf': 'Po306'},
> ?{'vlan_or_intf': 'VLAN2022'},
> ?{'vlan_or_intf': 'Interface'},
> ?{'vlan_or_intf': 'Gi7/33'},
> ?{'vlan_or_intf': 'Po1'},
> ?{'vlan_or_intf': 'Po306'},
> ?{'vlan_or_intf': 'VLAN2051'},
> ?{'vlan_or_intf': 'Interface'},
> ?{'vlan_or_intf': 'Gi9/6'},
> ?{'vlan_or_intf': 'VLAN2052'},
> ?{'vlan_or_intf': 'Interface'},
> ?{'vlan_or_intf': 'Gi9/6'},]
>
> I want it to be converted to:
>
> [{'2021':['Po1','Po306']},{'2022':['Gi7/33','Po1','Po306']},etc etc]
>
> I was going to write a def to loop through and look for certain pre-
> compiled regexs, and then put them in a new dictionary and append to a
> list, but I'm having trouble thinking of a good way to capture each
> dictionary. ?Each dictionary will have a key that is the vlan and the
> value will be a list of interfaces that participate in that vlan.
> Each list will be variable, many containing only one interface and
> some containing many interfaces.
>
> I thought about using itertools, but i only use that for fixed data.
> I don't know of a good way to loop over variably sized data. ?I was
> wondering if anyone had any ideas about a good way to convert this
> list or dictionary into the right format that I need. ?The solution I
> come up with will most likely be ugly and error prone, so I thought
> i'd ask this python list while I work. ?Hopefully I learn a better way
> to solve this problem.
>
> Thanks!
>
> I also have the data in a list,
>
> [ 'VLAN4065',
> ?'Interface',
> ?'Gi9/6',
> ?'Po2',
> ?'Po3',
> ?'Po306',
> ?'VLAN4068',
> ?'Interface',
> ?'Gi9/6',
> ?'VLAN4069',
> ?'Interface',
> ?'Gi9/6',]



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

from itertools import groupby

data = \
[ {'vlan_or_intf': 'VLAN2021'},
 {'vlan_or_intf': 'Interface'},
 {'vlan_or_intf': 'Po1'},
 {'vlan_or_intf': 'Po306'},
 {'vlan_or_intf': 'VLAN2022'},
 {'vlan_or_intf': 'Interface'},
 {'vlan_or_intf': 'Gi7/33'},
 {'vlan_or_intf': 'Po1'},
 {'vlan_or_intf': 'Po306'},
 {'vlan_or_intf': 'VLAN2051'},
 {'vlan_or_intf': 'Interface'},
 {'vlan_or_intf': 'Gi9/6'},
 {'vlan_or_intf': 'VLAN2052'},
 {'vlan_or_intf': 'Interface'},
 {'vlan_or_intf': 'Gi9/6'},]

def clean_up(lst):
	return [d.values()[0] for d in data if d.values()[0] != 'Interface']

out = {}
for k, g in groupby(clean_up(data) , key=lambda s:
s.startswith('VLAN')):
	if k:
		key = list(g)[0].replace('VLAN','')
	else:
		out[key] = list(g)

print out
===================================

hth,
L.


From tjreedy at udel.edu  Thu Mar  4 13:03:29 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 04 Mar 2010 13:03:29 -0500
Subject: memory usage, temporary and otherwise
In-Reply-To: <hmo751$plh$1@dough.gmane.org>
References: <mailman.220.1267642060.23598.python-list@python.org>	<4b8ee61a$0$26644$426a74cc@news.free.fr>
	<hmo751$plh$1@dough.gmane.org>
Message-ID: <hmoslf$h3b$1@dough.gmane.org>

On 3/4/2010 6:56 AM, mk wrote:
> Bruno Desthuilliers wrote:

> Huh? I was under impression that some time after 2.0 range was made to
> work "under the covers" like xrange when used in a loop? Or is it 3.0
> that does that?

3.0.




From john at castleamber.com  Thu Mar  4 13:06:15 2010
From: john at castleamber.com (John Bokma)
Date: Thu, 04 Mar 2010 12:06:15 -0600
Subject: Working group for Python CPAN-equivalence?
References: <mailman.179.1267620332.23598.python-list@python.org>
	<87r5o1v8vp.fsf@benfinney.id.au>
	<4b8e929d$0$1585$742ec2ed@news.sonic.net>
	<mailman.239.1267650035.23598.python-list@python.org>
	<87eik1ujg4.fsf@benfinney.id.au>
Message-ID: <87zl2oufl4.fsf@castleamber.com>

Ben Finney <ben+python at benfinney.id.au> writes:

> Terry Reedy <tjreedy at udel.edu> writes:
>
>> On 3/3/2010 12:05 PM, John Nagle wrote:
>> > CPAN is a repository. PyPi is an collection of links.
>>
>> As Ben said, PyPI currently is also a respository and not just links
>> to other repositories.

[..]

>> > CPAN enforces standard organization on packages. PyPi does not.
>
> This is, I think, something we don't need as much in Python; there is a
> fundamental difference between Perl's deeply nested namespace hierarchy
> and Python's inherently flat hierarchy.

Perl's hierarchy is 2 (e.g. Text::Balanced) or 3 levels deep
(e.g. Text::Ngram::LanguageDetermine), rarely deeper
(Text::Editor::Vip::Buffer::Plugins::Display). Which is in general most
likely just one level deeper than Python. Perl is not Java.

And I think that one additional level (or more) is a /must/ when you
have 17,530 (at the time of writing) modules.

If Python wants it's own CPAN it might be a good first move to not have
modules named "xmlrpclib", "wave", "keyword", "zlib", etc. But I don't
see that happen soon :-).

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From steve at holdenweb.com  Thu Mar  4 13:07:33 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 04 Mar 2010 13:07:33 -0500
Subject: memory usage, temporary and otherwise
In-Reply-To: <Xns9D317E4A4CAD5duncanbooth@127.0.0.1>
References: <mailman.220.1267642060.23598.python-list@python.org>
	<Xns9D317E4A4CAD5duncanbooth@127.0.0.1>
Message-ID: <hmosta$imp$1@dough.gmane.org>

Duncan Booth wrote:
> mk <mrkafk at gmail.com> wrote:
> 
>> Hm, apparently Python didn't spot that 'spam'*10 in a's values is really 
>> the same string, right?
> 
> If you want it to spot that then give it a hint that it should be looking 
> for identical strings:
> 
>  >>> a={}
>  >>> for i in range(10000000):
> ...     a[i]=intern('spam'*10)
> 
> should reduce your memory use somewhat.
> 
Better still, hoist the constant value out of the loop:

 >>> a={}
 >>> const = 'spam'*10
 >>> for i in range(10000000):
 ...     a[i] = const


regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Thu Mar  4 13:14:35 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 04 Mar 2010 13:14:35 -0500
Subject: WANTED: A good name for the pair (args, kwargs)
In-Reply-To: <hmo94l$9hb$1@south.jnrs.ja.net>
References: <hmo94l$9hb$1@south.jnrs.ja.net>
Message-ID: <hmotah$l00$1@dough.gmane.org>

Jonathan Fine wrote:
> Hi
> 
> We can call a function fn using
>     val = fn(*args, **kwargs)
> 
> I'm looking for a good name for the pair (args, kwargs).  Any suggestions?
> 
> Here's my use case:
>     def doit(fn , wibble, expect):
>         args, kwargs = wibble
>         actual = fn(*args, **kwargs)
>         if actual != expect:
>             # Something has gone wrong.
>             pass
> 
> This is part of a test runner.
> 
> For now I'll use argpair, but if anyone has a better idea, I'll use it.
> 
Not being able to find any existing names I called *args the
sequence-parameter and **kwarg the dict-parameter.

For your use, though, you might choose something like the "generic
parameter pair).

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From jeanmichel at sequans.com  Thu Mar  4 13:22:32 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Thu, 04 Mar 2010 19:22:32 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <hmos6c$fca$1@news.urz.uni-heidelberg.de>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>	<hmokot$uso$1@news.eternal-september.org>	<mailman.295.1267720340.23598.python-list@python.org>
	<hmos6c$fca$1@news.urz.uni-heidelberg.de>
Message-ID: <4B8FFA68.20000@sequans.com>

Michael Rudolf wrote:
> Am 04.03.2010 17:32, schrieb Jean-Michel Pichavant:
>> It looks like to me that 'with' statements are like decorators: 
>> overrated.
>
> Oh no, you just insulted my favourite two python features, followed 
> immediately by generators, iterators and list comprehensions / 
> generator expressions :p
>
> No, really: they *are* great ;D
>
> Regards,
> Michael
They are great, and because of that greatness some of us, including me, 
tend to use them where there's no point doing so.
I would never state that decorators are useless anyway, not in this 
list, I value my life too much :-) (I'll give it a try in the perl list)

JM


From alfps at start.no  Thu Mar  4 13:37:23 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Thu, 04 Mar 2010 19:37:23 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.300.1267723245.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>	<hmn03d$5r6$1@news.eternal-september.org>	<mailman.292.1267717742.23598.python-list@python.org>	<hmooo6$pg0$1@news.eternal-september.org>
	<mailman.300.1267723245.23598.python-list@python.org>
Message-ID: <hmoul7$2i9$1@news.eternal-september.org>

* Robert Kern:
> On 2010-03-04 10:56 AM, Alf P. Steinbach wrote:
>> * Robert Kern:
>>> On 2010-03-03 18:49 PM, Alf P. Steinbach wrote:
[snippety]
>>>
>>>> If you call the possibly failing operation "A", then that systematic
>>>> approach goes like this: if A fails, then it has cleaned up its own
>>>> mess, but if A succeeds, then it's the responsibility of the calling
>>>> code to clean up if the higher level (multiple statements) operation
>>>> that A is embedded in, fails.
>>>>
>>>> And that's what Marginean's original C++ ScopeGuard was designed for,
>>>> and what the corresponding Python Cleanup class is designed for.
>>>
>>> And try: finally:, for that matter.
>>
>> Not to mention "with".
>>
>> Some other poster made the same error recently in this thread; it is a
>> common fallacy in discussions about programming, to assume that since
>> the same can be expressed using lower level constructs, those are all
>> that are required.
>>
>> If adopted as true it ultimately means the removal of all control
>> structures above the level of "if" and "goto" (except Python doesn't
>> have "goto").
> 
> What I'm trying to explain is that the with: statement has a use even if 
> Cleanup doesn't. Arguing that Cleanup doesn't improve on try: finally: 
> does not mean that the with: statement doesn't improve on try: finally:.

That's a different argument, essentially that you see no advantage for your 
current coding patterns.

It's unconnected to the argument I responded to.

The argument that I responded to, that the possibility of expressing things at 
the level of try:finally: means that a higher level construct is superfluous, is 
still meaningless.



>>>>> Both formulations can be correct (and both work perfectly fine with
>>>>> the chdir() example being used). Sometimes one is better than the
>>>>> other, and sometimes not. You can achieve both ways with either your
>>>>> Cleanup class or with try: finally:.
>>>>>
>>>>> I am still of the opinion that Cleanup is not an improvement over try:
>>>>> finally: and has the significant ugliness of forcing cleanup code into
>>>>> callables. This significantly limits what you can do in your cleanup
>>>>> code.
>>>>
>>>> Uhm, not really. :-) As I see it.
>>>
>>> Well, not being able to affect the namespace is a significant
>>> limitation. Sometimes you need to delete objects from the namespace in
>>> order to ensure that their refcounts go to zero and their cleanup code
>>> gets executed.
>>
>> Just a nit (I agree that a lambda can't do this, but as to what's
>> required): assigning None is sufficient for that[1].
> 
> Yes, but no callable is going to allow you to assign None to names in 
> that namespace, either. Not without sys._getframe() hackery, in any case.
> 
>> However, note that the current language doesn't guarantee such cleanup,
>> at least as far as I know.
>>
>> So while it's good practice to support it, to do everything to let it
>> happen, it's presumably bad practice to rely on it happening.
>>
>>
>>> Tracebacks will keep the namespace alive and all objects in it.
>>
>> Thanks!, I hadn't thought of connecting that to general cleanup actions.
>>
>> It limits the use of general "with" in the same way.
> 
> Not really.

Sorry, it limits general 'with' in /exactly/ the same way.


> It's easy to write context managers that do that [delete objects from the namespace].

Sorry, no can do, as far as I know; your following example quoted below is an 
example of /something else/.

And adding on top of irrelevancy, for the pure technical aspect it can be 
accomplished in the same way using Cleanup (I provide an example below).

However, doing that would generally be worse than pointless since with good 
coding practices the objects would become unreferenced anyway.


> You put 
> the initialization code in the __enter__() method, assign whatever 
> objects you want to keep around through the with: clause as attributes 
> on the manager, then delete those attributes in the __exit__().

Analogously, if one were to do this thing, then it could be accomplished using a 
Cleanup context manager as follows:

   foo = lambda: None
   foo.x = create_some_object()
   at_cleanup.call( lambda o = foo: delattr( o, "x" ) )

... except that

   1) for a once-only case this is less code :-)

   2) it is a usage that I wouldn't recommend; instead I recommend adopting good
      coding practices where object references aren't kept around.


> Or, you 
> use the @contextmanager decorator to turn a generator into a context 
> manager, and you just assign to local variables and del them in the 
> finally: clause.

Uhm, you don't need a 'finally' clause when you define a context manager.

Additionally, you don't need to 'del' the local variables in @contextmanager 
decorated generator.

The local variables cease to exist automatically.


> What you can't do is write a generic context manager where the 
> initialization happens inside the with: clause and the cleanup actions 
> are registered callables. That does not allow you to affect the namespace.

If you mean that you can't introduce direct local variables and have them 
deleted by "registered callables" in a portable way, then right.

But I can't think of any example where that would be relevant; in particular 
what matters for supporting on-destruction cleanup is whether you keep any 
references or not, not whether you have a local variable of any given name.

And I think "with" is quite useful even with that restriction.


Cheers,

- Alf



From pemerson at gmail.com  Thu Mar  4 13:39:30 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Thu, 4 Mar 2010 10:39:30 -0800 (PST)
Subject: Evaluate my first python script, please
Message-ID: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>

I've written my first python program, and would love suggestions for
improvement.

I'm a perl programmer and used a perl version of this program to guide
me. So in that sense, the python is "perlesque"

This script parses /etc/hosts for hostnames, and based on terms given
on the command line (argv), either prints the list of hostnames that
match all the criteria, or uses ssh to connect to the host if the
number of matches is unique.

I am looking for advice along the lines of "an easier way to do this"
or "a more python way" (I'm sure that's asking for trouble!) or
"people commonly do this instead" or "here's a slick trick" or "oh,
interesting, here's my version to do the same thing".

I am aware that there are performance improvements and error checking
that could be made, such as making sure the file exists and is
readable and precompiling the regular expressions and not calculating
how many sys.argv arguments there are more than once. I'm not hyper
concerned with performance or idiot proofing for this particular
script.

Thanks in advance.

########################################################
#!/usr/bin/python

import sys, fileinput, re, os

filename = '/etc/hosts'

hosts = []

for line in open(filename, 'r'):
	match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line)
	if match is None or re.search('^(?:float|localhost)\.', line):
continue
	hostname = match.group(1)
	count = 0
	for arg in sys.argv[1:]:
		for section in hostname.split('.'):
			if section == arg:
				count = count + 1
				break
	if count == len(sys.argv) - 1:
		hosts.append(hostname)

if len(hosts) == 1:
	os.system("ssh -A " + hosts[0])
else:
	print '\n'.join(hosts)


From as at sci.fi  Thu Mar  4 13:43:19 2010
From: as at sci.fi (Anssi Saari)
Date: Thu, 04 Mar 2010 20:43:19 +0200
Subject: pyao makes the right sound but why?
References: <mailman.192.1267627812.23598.python-list@python.org>
Message-ID: <vg3k4tskjw8.fsf@pepper.modeemi.cs.tut.fi>

"'2+" <electriclightheads at gmail.com> writes:

> dev = ao.AudioDevice('alsa')
> dev.play(x)
>
> could launch me a semi realtime dj kinda sys
> luckily .. it does seem to be making the right sound
> but why?
> the default of the samplerate and that 16bit happened to match with my thing x?

Yes, that seems to be the case from help(ao). But I couldn't run 
tofu = soy.Bean() since it seems to want tit01.wav. Do you make that
available somewhere?


From tim.wintle at teamrubber.com  Thu Mar  4 14:07:24 2010
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 04 Mar 2010 19:07:24 +0000
Subject: Evaluate my first python script, please
In-Reply-To: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
Message-ID: <1267729644.11093.11.camel@localhost>

On Thu, 2010-03-04 at 10:39 -0800, Pete Emerson wrote:
> I am looking for advice along the lines of "an easier way to do this"
> or "a more python way" (I'm sure that's asking for trouble!) or
> "people commonly do this instead" or "here's a slick trick" or "oh,
> interesting, here's my version to do the same thing".

(1) I would wrap it all in a function

def main():
    # your code here

if __name__ == "__main__":
    main()

(2) PEP8 (python style guidelines) suggests one import per line

(3) I'd use four spaces as tab width

(4) 
I'd change this:

>     for arg in sys.argv[1:]:
>         for section in hostname.split('.'):
>             if section == arg:
>                 count = count + 1
>                 break

to something more like:

    for section in hostname.split("."):
        if section in sys.argv[1:]:
            count += 1

(although as you suggested I'd only calculate sys.argv[1:] once)

... or you could replace whole section between the for loop and
hosts.append with:

    if sorted(hostname.split(".")) == sorted(sys.argv[1:]):
        host.append(hostname)


, at a slight loss of clarity - but I think I'd stick with the more
verbose version personally.

Tim





From stefan_ml at behnel.de  Thu Mar  4 14:10:47 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Thu, 04 Mar 2010 20:10:47 +0100
Subject: Partly erratic wrong behaviour, Python 3, lxml
In-Reply-To: <qotr5o0xt3l.fsf@ruuvi.it.helsinki.fi>
References: <qotr5o0xt3l.fsf@ruuvi.it.helsinki.fi>
Message-ID: <hmp0jq$2a9$1@dough.gmane.org>

Jussi Piitulainen, 04.03.2010 11:46:
> I am observing weird semi-erratic behaviour that involves Python 3 and
> lxml, is extremely sensitive to changes in the input data, and only
> occurs when I name a partial result. I would like some help with this,
> please. (Python 3.1.1; GNU/Linux; how do I find lxml version?)

Here's how to find the version:

http://codespeak.net/lxml/FAQ.html#i-think-i-have-found-a-bug-in-lxml-what-should-i-do

I'll give your test code a try when I get to it. However, note that the 
best place to discuss this is the lxml mailing list:

http://codespeak.net/mailman/listinfo/lxml-dev

Stefan



From duncan.booth at invalid.invalid  Thu Mar  4 14:15:42 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 4 Mar 2010 19:15:42 GMT
Subject: NoSQL Movement?
References: <Xns9D318550EF1D6duncanbooth@127.0.0.1>
	<mailman.289.1267714060.23598.python-list@python.org>
Message-ID: <Xns9D31C31E6FFA3duncanbooth@127.0.0.1>

mk <mrkafk at gmail.com> wrote:

> Duncan Booth wrote:
> 
>> If you look at some of the uses of bigtable you may begin to
>> understand the tradeoffs that are made with sql. When you use
>> bigtable you have records with fields, and you have indices, but
>> there are limitations on the kinds of queries you can perform: in
>> particular you cannot do joins, but more subtly there is no guarantee
>> that the index is up to date (so you might miss recent updates or
>> even get data back from a query when the data no longer matches the
>> query). 
> 
> Hmm, I do understand that bigtable is used outside of traditional 
> 'enterprisey' contexts, but suppose you did want to do an equivalent
> of join; is it at all practical or even possible?
> 
> I guess when you're forced to use denormalized data, you have to 
> simultaneously update equivalent columns across many tables yourself, 
> right? Or is there some machinery to assist in that?

Or you avoid having to do that sort of update at all.

There are many applications which simply wouldn't be applicable to 
bigtable. My point was that to make best use of bigtable you may have to 
make different decisions when designing the software.

> 
>> By sacrificing some of SQL's power, Google get big benefits: namely 
>> updating data is a much more localised option. Instead of an update 
>> having to lock the indices while they are updated, updates to
>> different records can happen simultaneously possibly on servers on
>> the opposite sides of the world. You can have many, many servers all
>> using the same data although they may not have identical or
>> completely consistent views of that data.
> 
> And you still have the global view of the table spread across, say, 2 
> servers, one located in Australia, second in US?
> 
More likely spread across a few thousand servers. The data migrates round 
the servers as required. As I understand it records are organised in 
groups: when you create a record you can either make it a root record or 
you can give it a parent record. So for example you might make all the data 
associated with a specific user live with the user record as a parent (or 
ancestor). When you access any of that data then all of it is copied onto a 
server near the application as all records under a common root are always 
stored together.

>> Bigtable impacts on how you store the data: for example you need to 
>> avoid reducing data to normal form (no joins!), its much better and 
>> cheaper just to store all the data you need directly in each record. 
>> Also aggregate values need to be at least partly pre-computed and
>> stored in the database.
> 
> So you basically end up with a few big tables or just one big table
> really? 

One. Did I mention that bigtable doesn't require you to have the same 
columns in every record? The main use of bigtable (outside of Google's 
internal use) is Google App Engine and that apparently uses one table.

Not one table per application, one table total. It's a big table.

> 
> Suppose on top of 'tweets' table you have 'dweebs' table, and tweets
> and dweebs sometimes do interact. How would you find such interacting
> pairs? Would you say "give me some tweets" to tweets table, extract
> all the dweeb_id keys from tweets and then retrieve all dweebs from
> dweebs table? 

If it is one tweet to many dweebs?

  Dweeb.all().filter("tweet =", tweet.key())
or:
  GqlQuery("SELECT * FROM Dweeb WHERE tweet = :tweet", tweet=tweet)

or just make the tweet the ancestor of all its dweebs.

Columns may be scalars or lists, so if it is some tweets to many dweebs you 
can do basically the same thing.

  Dweeb.all().filter("tweets =", tweet.key())

but if there are too many tweets in the list that could be a problem.

If you want dweebs for several tweets you could select with "tweet IN " the 
list of tweets or do a separate query for each (not much difference, as I 
understand it the IN operator just expands into several queries internally 
anyway).


From pruebauno at latinmail.com  Thu Mar  4 14:18:49 2010
From: pruebauno at latinmail.com (nn)
Date: Thu, 4 Mar 2010 11:18:49 -0800 (PST)
Subject: loop over list and process into groups
References: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>
	<5e9126f7-f9e2-4c38-8dd5-dc174204fd71@d27g2000yqf.googlegroups.com>
Message-ID: <865d59ab-585b-4908-be0d-e891d0a0a08b@t23g2000yqt.googlegroups.com>



lbolla wrote:
> On Mar 4, 3:57?pm, Sneaky Wombat <joe.hr... at gmail.com> wrote:
> > [ {'vlan_or_intf': 'VLAN2021'},
> > ?{'vlan_or_intf': 'Interface'},
> > ?{'vlan_or_intf': 'Po1'},
> > ?{'vlan_or_intf': 'Po306'},
> > ?{'vlan_or_intf': 'VLAN2022'},
> > ?{'vlan_or_intf': 'Interface'},
> > ?{'vlan_or_intf': 'Gi7/33'},
> > ?{'vlan_or_intf': 'Po1'},
> > ?{'vlan_or_intf': 'Po306'},
> > ?{'vlan_or_intf': 'VLAN2051'},
> > ?{'vlan_or_intf': 'Interface'},
> > ?{'vlan_or_intf': 'Gi9/6'},
> > ?{'vlan_or_intf': 'VLAN2052'},
> > ?{'vlan_or_intf': 'Interface'},
> > ?{'vlan_or_intf': 'Gi9/6'},]
> >
> > I want it to be converted to:
> >
> > [{'2021':['Po1','Po306']},{'2022':['Gi7/33','Po1','Po306']},etc etc]
> >
> > I was going to write a def to loop through and look for certain pre-
> > compiled regexs, and then put them in a new dictionary and append to a
> > list, but I'm having trouble thinking of a good way to capture each
> > dictionary. ?Each dictionary will have a key that is the vlan and the
> > value will be a list of interfaces that participate in that vlan.
> > Each list will be variable, many containing only one interface and
> > some containing many interfaces.
> >
> > I thought about using itertools, but i only use that for fixed data.
> > I don't know of a good way to loop over variably sized data. ?I was
> > wondering if anyone had any ideas about a good way to convert this
> > list or dictionary into the right format that I need. ?The solution I
> > come up with will most likely be ugly and error prone, so I thought
> > i'd ask this python list while I work. ?Hopefully I learn a better way
> > to solve this problem.
> >
> > Thanks!
> >
> > I also have the data in a list,
> >
> > [ 'VLAN4065',
> > ?'Interface',
> > ?'Gi9/6',
> > ?'Po2',
> > ?'Po3',
> > ?'Po306',
> > ?'VLAN4068',
> > ?'Interface',
> > ?'Gi9/6',
> > ?'VLAN4069',
> > ?'Interface',
> > ?'Gi9/6',]
>
>
>
> ===================================
>
> from itertools import groupby
>
> data = \
> [ {'vlan_or_intf': 'VLAN2021'},
>  {'vlan_or_intf': 'Interface'},
>  {'vlan_or_intf': 'Po1'},
>  {'vlan_or_intf': 'Po306'},
>  {'vlan_or_intf': 'VLAN2022'},
>  {'vlan_or_intf': 'Interface'},
>  {'vlan_or_intf': 'Gi7/33'},
>  {'vlan_or_intf': 'Po1'},
>  {'vlan_or_intf': 'Po306'},
>  {'vlan_or_intf': 'VLAN2051'},
>  {'vlan_or_intf': 'Interface'},
>  {'vlan_or_intf': 'Gi9/6'},
>  {'vlan_or_intf': 'VLAN2052'},
>  {'vlan_or_intf': 'Interface'},
>  {'vlan_or_intf': 'Gi9/6'},]
>
> def clean_up(lst):
> 	return [d.values()[0] for d in data if d.values()[0] != 'Interface']
>
> out = {}
> for k, g in groupby(clean_up(data) , key=lambda s:
> s.startswith('VLAN')):
> 	if k:
> 		key = list(g)[0].replace('VLAN','')
> 	else:
> 		out[key] = list(g)
>
> print out
> ===================================
>
> hth,
> L.

Good use of groupby. Here is what I ended up coming up:

from itertools import groupby
laninfo=[ 'VLAN4065',
 'Interface',
 'Gi9/6',
 'Po2',
 'Po3',
 'Po306',
 'VLAN4068',
 'Interface',
 'Gi9/6',
 'VLAN4069',
 'Interface',
 'Gi9/6',]

def splitgrp(s, f=[False]):
   f[0]^=s.startswith('VLAN')
   return f[0]
lanlst=(list(g) for k,g in groupby(laninfo,key=splitgrp))
out={item[0][4:]:item[2:] for item in lanlst}
print(out)


From db3l.net at gmail.com  Thu Mar  4 14:21:58 2010
From: db3l.net at gmail.com (David Bolen)
Date: Thu, 04 Mar 2010 14:21:58 -0500
Subject: Generic singleton
References: <mailman.222.1267642515.23598.python-list@python.org>
	<pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>
	<Xns9D317DB33C63Aduncanbooth@127.0.0.1>
Message-ID: <m2ocj3nb8p.fsf@valheru.db3l.homeip.net>

Duncan Booth <duncan.booth at invalid.invalid> writes:

> It is also *everywhere* in the Python world. Unlike Java and C++, Python 
> even has its own built-in type for singletons.
>
> If you want a singleton in Python use a module.
>
> So the OP's original examples become:
>
> --- file singleton.py ---
> foo = {}
> bar = []
>
> --- other.py ---
> from singleton import foo as s1
> from singleton import foo as s2
> from singleton import bar as s3
> from singleton import bar as s4
>
> ... and then use them as you wish.

In the event you do use a module as a singleton container, I would
advocate sticking with fully qualified names, avoiding the use of
"from" imports or any other local namespace caching of references.

Other code sharing the module may not update things as expected, e.g.:

    import singleton

    singleton.foo = {}

at which point you've got two objects around - one in the singleton.py
module namespace, and the s1/s2 referenced object in other.py.

If you're confident of the usage pattern of all the using code, it may
not be critical.  But consistently using "singleton.foo" (or an import
alias like s.foo) is a bit more robust, sticking with only one
namespace to reach the singleton.

-- David




From python at mrabarnett.plus.com  Thu Mar  4 14:30:55 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 04 Mar 2010 19:30:55 +0000
Subject: Evaluate my first python script, please
In-Reply-To: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
Message-ID: <4B900A6F.40104@mrabarnett.plus.com>

Pete Emerson wrote:
> I've written my first python program, and would love suggestions for
> improvement.
> 
> I'm a perl programmer and used a perl version of this program to guide
> me. So in that sense, the python is "perlesque"
> 
> This script parses /etc/hosts for hostnames, and based on terms given
> on the command line (argv), either prints the list of hostnames that
> match all the criteria, or uses ssh to connect to the host if the
> number of matches is unique.
> 
> I am looking for advice along the lines of "an easier way to do this"
> or "a more python way" (I'm sure that's asking for trouble!) or
> "people commonly do this instead" or "here's a slick trick" or "oh,
> interesting, here's my version to do the same thing".
> 
> I am aware that there are performance improvements and error checking
> that could be made, such as making sure the file exists and is
> readable and precompiling the regular expressions and not calculating
> how many sys.argv arguments there are more than once. I'm not hyper
> concerned with performance or idiot proofing for this particular
> script.
> 
> Thanks in advance.
> 
> ########################################################
> #!/usr/bin/python
> 
> import sys, fileinput, re, os
> 
> filename = '/etc/hosts'
> 
> hosts = []
> 
> for line in open(filename, 'r'):
> 	match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line)

Use 'raw' strings for regular expressions.

'Normal' Python string literals use backslashes in escape sequences (eg,
'\n'), but so do regular expressions, and regular expressions are passed
to the 're' module in strings, so that can lead to a profusion of
backslashes!

You could either escape the backslashes:

  	match = re.search('\\d+\\.\\d+\\.\\d+\\.\\d+\s+(\\S+)', line)

or use a raw string:

  	match = re.search(r'\d+\.\d+\.\d+\.\d+\s+(\S+)', line)

A raw string literal is just like a normal string literal, except that
backslashes aren't special.

> 	if match is None or re.search('^(?:float|localhost)\.', line):
> continue

It would be more 'Pythonic' to say "not match".

	if not match or re.search(r'^(?:float|localhost)\.', line):

> 	hostname = match.group(1)
> 	count = 0
> 	for arg in sys.argv[1:]:
> 		for section in hostname.split('.'):
> 			if section == arg:
> 				count = count + 1

Shorter is:

				count += 1

> 				break
> 	if count == len(sys.argv) - 1:
> 		hosts.append(hostname)
> 
> if len(hosts) == 1:
> 	os.system("ssh -A " + hosts[0])
> else:
> 	print '\n'.join(hosts)

You're splitting the hostname repeatedly. You could split it just once,
outside the outer loop, and maybe make it into a set. You could then
have:

         host_parts = set(hostname.split('.'))
	count = 0
	for arg in sys.argv[1:]:
		if arg in host_parts:
			count += 1

Incidentally, the re module contains a cache, so the regular expressions
won't be recompiled every time (unless you have a lot of them and the re
module flushes the cache).


From robert.kern at gmail.com  Thu Mar  4 14:37:29 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 04 Mar 2010 13:37:29 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <hmoul7$2i9$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>	<hmn03d$5r6$1@news.eternal-september.org>	<mailman.292.1267717742.23598.python-list@python.org>	<hmooo6$pg0$1@news.eternal-september.org>	<mailman.300.1267723245.23598.python-list@python.org>
	<hmoul7$2i9$1@news.eternal-september.org>
Message-ID: <hmp25r$7te$1@dough.gmane.org>

On 2010-03-04 12:37 PM, Alf P. Steinbach wrote:
> * Robert Kern:
>> On 2010-03-04 10:56 AM, Alf P. Steinbach wrote:
>>> * Robert Kern:
>>>> On 2010-03-03 18:49 PM, Alf P. Steinbach wrote:
> [snippety]
>>>>
>>>>> If you call the possibly failing operation "A", then that systematic
>>>>> approach goes like this: if A fails, then it has cleaned up its own
>>>>> mess, but if A succeeds, then it's the responsibility of the calling
>>>>> code to clean up if the higher level (multiple statements) operation
>>>>> that A is embedded in, fails.
>>>>>
>>>>> And that's what Marginean's original C++ ScopeGuard was designed for,
>>>>> and what the corresponding Python Cleanup class is designed for.
>>>>
>>>> And try: finally:, for that matter.
>>>
>>> Not to mention "with".
>>>
>>> Some other poster made the same error recently in this thread; it is a
>>> common fallacy in discussions about programming, to assume that since
>>> the same can be expressed using lower level constructs, those are all
>>> that are required.
>>>
>>> If adopted as true it ultimately means the removal of all control
>>> structures above the level of "if" and "goto" (except Python doesn't
>>> have "goto").
>>
>> What I'm trying to explain is that the with: statement has a use even
>> if Cleanup doesn't. Arguing that Cleanup doesn't improve on try:
>> finally: does not mean that the with: statement doesn't improve on
>> try: finally:.
>
> That's a different argument, essentially that you see no advantage for
> your current coding patterns.
>
> It's unconnected to the argument I responded to.
>
> The argument that I responded to, that the possibility of expressing
> things at the level of try:finally: means that a higher level construct
> is superfluous, is still meaningless.

I am attacking your premise that the "with Cleanup():" construct is higher level 
than try: finally:. It isn't. It provides the same level of abstraction as try: 
finally:.

This is distinct from the accepted uses of the with: statement which *are* 
higher level than try: finally: and which do confer practical benefits over 
using try: finally: despite being syntactical sugar for try: finally:.

>>>>>> Both formulations can be correct (and both work perfectly fine with
>>>>>> the chdir() example being used). Sometimes one is better than the
>>>>>> other, and sometimes not. You can achieve both ways with either your
>>>>>> Cleanup class or with try: finally:.
>>>>>>
>>>>>> I am still of the opinion that Cleanup is not an improvement over
>>>>>> try:
>>>>>> finally: and has the significant ugliness of forcing cleanup code
>>>>>> into
>>>>>> callables. This significantly limits what you can do in your cleanup
>>>>>> code.
>>>>>
>>>>> Uhm, not really. :-) As I see it.
>>>>
>>>> Well, not being able to affect the namespace is a significant
>>>> limitation. Sometimes you need to delete objects from the namespace in
>>>> order to ensure that their refcounts go to zero and their cleanup code
>>>> gets executed.
>>>
>>> Just a nit (I agree that a lambda can't do this, but as to what's
>>> required): assigning None is sufficient for that[1].
>>
>> Yes, but no callable is going to allow you to assign None to names in
>> that namespace, either. Not without sys._getframe() hackery, in any case.
>>
>>> However, note that the current language doesn't guarantee such cleanup,
>>> at least as far as I know.
>>>
>>> So while it's good practice to support it, to do everything to let it
>>> happen, it's presumably bad practice to rely on it happening.
>>>
>>>
>>>> Tracebacks will keep the namespace alive and all objects in it.
>>>
>>> Thanks!, I hadn't thought of connecting that to general cleanup actions.
>>>
>>> It limits the use of general "with" in the same way.
>>
>> Not really.
>
> Sorry, it limits general 'with' in /exactly/ the same way.
>
>> It's easy to write context managers that do that [delete objects from
>> the namespace].
>
> Sorry, no can do, as far as I know; your following example quoted below
> is an example of /something else/.

Okay, so what do you mean by 'the use of general "with"'? I'm talking about 
writing a context manager or using the @contextmanager decorator to do some 
initialization and then later cleaning up that initialization. That cleaning up 
may entail deleting an object. You are correct that the context manager can't 
affect the namespace of the with: clause, but that's not the initialization that 
it would need to clean up.

Yes, you can write code with a with: statement where you try to clean up stuff 
that happened inside of the clause (you did), but that's not how the with: 
statement was ever intended to be used nor is it good practice to do so because 
of that limitation. Context managers are designed to initialize specific things, 
then clean them up. I thought you were talking about the uses of the with: 
statement as described in PEP-343, not every possible misuse of the with: statement.

> And adding on top of irrelevancy, for the pure technical aspect it can
> be accomplished in the same way using Cleanup (I provide an example below).
>
> However, doing that would generally be worse than pointless since with
> good coding practices the objects would become unreferenced anyway.
>
>
>> You put the initialization code in the __enter__() method, assign
>> whatever objects you want to keep around through the with: clause as
>> attributes on the manager, then delete those attributes in the
>> __exit__().
>
> Analogously, if one were to do this thing, then it could be accomplished
> using a Cleanup context manager as follows:
>
> foo = lambda: None
> foo.x = create_some_object()
> at_cleanup.call( lambda o = foo: delattr( o, "x" ) )
>
> ... except that
>
> 1) for a once-only case this is less code :-)

Not compared to a try: finally:, it isn't.

> 2) it is a usage that I wouldn't recommend; instead I recommend adopting
> good
> coding practices where object references aren't kept around.

Many of the use cases of the with: statement involve creating an object (like a 
lock or a transaction object), keeping it around for the duration of the "# Do 
stuff" block, and then finalizing it.

>> Or, you use the @contextmanager decorator to turn a generator into a
>> context manager, and you just assign to local variables and del them
>> in the finally: clause.
>
> Uhm, you don't need a 'finally' clause when you define a context manager.

When you use the @contextmanager decorator, you almost always do. See the 
Examples section of PEP 343:

   http://www.python.org/dev/peps/pep-0343/

> Additionally, you don't need to 'del' the local variables in
> @contextmanager decorated generator.
>
> The local variables cease to exist automatically.

True.

>> What you can't do is write a generic context manager where the
>> initialization happens inside the with: clause and the cleanup actions
>> are registered callables. That does not allow you to affect the
>> namespace.
>
> If you mean that you can't introduce direct local variables and have
> them deleted by "registered callables" in a portable way, then right.
>
> But I can't think of any example where that would be relevant; in
> particular what matters for supporting on-destruction cleanup is whether
> you keep any references or not, not whether you have a local variable of
> any given name.

Well, local variables keep references to objects. Variable assignment followed 
by deletion is a very readable way to keep an object around for a while then 
remove it later. If you have to go through less readable contortions to keep the 
object around when it needs to be and clean it up later, then that is a mark 
against your approach.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From steve at holdenweb.com  Thu Mar  4 14:49:27 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 04 Mar 2010 14:49:27 -0500
Subject: A "scopeguard" for Python
In-Reply-To: <hmop33$rrj$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>	<hmokot$uso$1@news.eternal-september.org>	<mailman.293.1267718664.23598.python-list@python.org>
	<hmop33$rrj$1@news.eternal-september.org>
Message-ID: <hmp2sf$8d1$1@dough.gmane.org>

Alf P. Steinbach wrote:
> * Robert Kern:
[...]
>> No, it only argues that "with Cleanup():" is supernumerary.
> 
> I don't know what "supernumerary" means, but to the degree that the
> argument says anything about a construct that is not 'finally', it says
> the same about general "with".
> 
So rather than look up the meaning if a word you aren't familiar with
you will argue against its use in generic style?

> So whatever you mean by supernumerary, you're saying that the argument
> implies that "with" is supernumerary.
> 
> This is starting to look like some earlier discussions in this group,
> where even basic logic is denied.
> 
Why not just stick to the facts and forget about the earlier discussions?

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From pruebauno at latinmail.com  Thu Mar  4 14:54:55 2010
From: pruebauno at latinmail.com (nn)
Date: Thu, 4 Mar 2010 11:54:55 -0800 (PST)
Subject: Evaluate my first python script, please
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
	<mailman.309.1267731058.23598.python-list@python.org>
Message-ID: <9b598cad-3069-49a9-b2d0-378e973a8ce2@x22g2000yqx.googlegroups.com>

On Mar 4, 2:30?pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
> Pete Emerson wrote:
> > I've written my first python program, and would love suggestions for
> > improvement.
>
> > I'm a perl programmer and used a perl version of this program to guide
> > me. So in that sense, the python is "perlesque"
>
> > This script parses /etc/hosts for hostnames, and based on terms given
> > on the command line (argv), either prints the list of hostnames that
> > match all the criteria, or uses ssh to connect to the host if the
> > number of matches is unique.
>
> > I am looking for advice along the lines of "an easier way to do this"
> > or "a more python way" (I'm sure that's asking for trouble!) or
> > "people commonly do this instead" or "here's a slick trick" or "oh,
> > interesting, here's my version to do the same thing".
>
> > I am aware that there are performance improvements and error checking
> > that could be made, such as making sure the file exists and is
> > readable and precompiling the regular expressions and not calculating
> > how many sys.argv arguments there are more than once. I'm not hyper
> > concerned with performance or idiot proofing for this particular
> > script.
>
> > Thanks in advance.
>
> > ########################################################
> > #!/usr/bin/python
>
> > import sys, fileinput, re, os
>
> > filename = '/etc/hosts'
>
> > hosts = []
>
> > for line in open(filename, 'r'):
> > ? ?match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line)
>
> Use 'raw' strings for regular expressions.
>
> 'Normal' Python string literals use backslashes in escape sequences (eg,
> '\n'), but so do regular expressions, and regular expressions are passed
> to the 're' module in strings, so that can lead to a profusion of
> backslashes!
>
> You could either escape the backslashes:
>
> ? ? ? ? match = re.search('\\d+\\.\\d+\\.\\d+\\.\\d+\s+(\\S+)', line)
>
> or use a raw string:
>
> ? ? ? ? match = re.search(r'\d+\.\d+\.\d+\.\d+\s+(\S+)', line)
>
> A raw string literal is just like a normal string literal, except that
> backslashes aren't special.
>
> > ? ?if match is None or re.search('^(?:float|localhost)\.', line):
> > continue
>
> It would be more 'Pythonic' to say "not match".
>
> ? ? ? ? if not match or re.search(r'^(?:float|localhost)\.', line):
>
> > ? ?hostname = match.group(1)
> > ? ?count = 0
> > ? ?for arg in sys.argv[1:]:
> > ? ? ? ? ? ?for section in hostname.split('.'):
> > ? ? ? ? ? ? ? ? ? ?if section == arg:
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ?count = count + 1
>
> Shorter is:
>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? count += 1
>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ?break
> > ? ?if count == len(sys.argv) - 1:
> > ? ? ? ? ? ?hosts.append(hostname)
>
> > if len(hosts) == 1:
> > ? ?os.system("ssh -A " + hosts[0])
> > else:
> > ? ?print '\n'.join(hosts)
>
> You're splitting the hostname repeatedly. You could split it just once,
> outside the outer loop, and maybe make it into a set. You could then
> have:
>
> ? ? ? ? ?host_parts = set(hostname.split('.'))
> ? ? ? ? count = 0
> ? ? ? ? for arg in sys.argv[1:]:
> ? ? ? ? ? ? ? ? if arg in host_parts:
> ? ? ? ? ? ? ? ? ? ? ? ? count += 1
>
> Incidentally, the re module contains a cache, so the regular expressions
> won't be recompiled every time (unless you have a lot of them and the re
> module flushes the cache).

I think that you really just need a set intersection for the count
part and this should work:

host_parts = set(hostname.split('.'))
count = len(host_parts.intersection(sys.argv[1:]))



From knipknap at gmail.com  Thu Mar  4 14:55:21 2010
From: knipknap at gmail.com (knipknap)
Date: Thu, 4 Mar 2010 11:55:21 -0800 (PST)
Subject: ANNOUNCE: Exscript 2.0
Message-ID: <18ffe924-0068-42dc-ad36-da3c0ba07308@z35g2000yqd.googlegroups.com>

Introduction
-------------
Exscript is a Python module and template processor for automating
Telnet or SSH sessions. Exscript supports a wide range of features,
such as parallelization, AAA authentication methods, TACACS, and a
very simple template language. Please refer to the project page for
updated documentation (see the links at the bottom of this
announcement).

New since 0.9.16
------------------
Exscript 2.0 is without a doubt the most awesome release of Exscript
ever. It is well tested and has already proven to be robust, so use in
a production environment is encouraged.

Changes in this release:

* Exscript's Python API has been completely overhauled and made a lot
simpler. The new API is well documented [1][2].
* Countless utilities for network administrators using Python were
added. For example, it is now trivial to generate reports and emails,
logging is more configurable, new functions for reading and writing
input and output files were added, and user interaction was
simplified.
* The number of dependencies was reduced to make the installation
easier.
* Exscript is now almost 100% unit tested. That means greatly enhanced
stability and reliability.
* Support for threading was improved, leading to better performance
when using a large number of parallel connections.
* The SSH support was greatly improved.
* Exscript now includes some useful Tkinter widgets for monitoring the
Exscript Queue.
* Support for Pseudo devices: It is now possible to emulate a fake
device that behaves like a router. This can come in handy for testing.
* Of course, a huge number of bugs was also fixed. I expect this
release to be the most stable one to date. It was also well tested in
production and has handled hundreds of thousands of Telnet connections
in the past few months.

Dependencies
-------------
* Python 2.2 or greater
* Python-crypto
* paramiko (optional, for SSH2 support)
* Python-pexpect (optional, for SSH1 support)
* OpenSSH (optional, for SSH1 support)

Download Exscript
------------------
Release: http://github.com/knipknap/exscript/downloads
Git: http://code.google.com/p/exscript/source

Links
------
[1] Exscript Documentation: http://wiki.github.com/knipknap/exscript/documentation
[2] Exscript Python API: http://knipknap.github.com/exscript/api/
[3] Installation Guide: http://wiki.github.com/knipknap/exscript/installation-guide
[4] Exscript home page: http://wiki.github.com/knipknap/exscript/
[5] Mailing list: http://groups.google.com/group/exscript
[6] Bug tracker: http://github.com/knipknap/exscript/issues
[7] Browse the source: http://github.com/knipknap/exscript


From mrmakent at gmail.com  Thu Mar  4 15:48:30 2010
From: mrmakent at gmail.com (Mike Kent)
Date: Thu, 4 Mar 2010 12:48:30 -0800 (PST)
Subject: A "scopeguard" for Python
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<hmm0rd$a48$1@news.eternal-september.org>
Message-ID: <915588d0-e4fd-42d0-b5b5-3506700924ae@q16g2000yqq.googlegroups.com>

On Mar 3, 10:56?am, "Alf P. Steinbach" <al... at start.no> wrote:
> * Mike Kent:
>
> > What's the compelling use case for this vs. a simple try/finally?
>
> if you thought about it you would mean a simple "try/else". "finally" is always
> executed. which is incorrect for cleanup
>
> by the way, that's one advantage:
>
> a "with Cleanup" is difficult to get wrong, while a "try" is easy to get wrong,
> as you did here
>
> ? ?---
>
> another general advantage is as for the 'with' statement generally
>
> > ? ?original_dir = os.getcwd()
> > ? ?try:
> > ? ? ? ?os.chdir(somewhere)
> > ? ? ? ?# Do other stuff
>
> also, the "do other stuff" can be a lot of code
>
> and also, with more than one action the try-else introduces a lot of nesting
>
> > ? ?finally:
> > ? ? ? ?os.chdir(original_dir)
> > ? ? ? ?# Do other cleanup
>
> cheers & hth.,
>
> - alf

Wrong?  In what way is my example wrong?  It cleanly makes sure that
the current working directory is the same after the try/finally as it
was before it.  Suboptimal, perhaps, in that the chdir in the finally
part is always executed, even if the chdir in the try part failed to
change the working directory.

That is a clear advantage to the code you presented, in that you have
the ability to register an 'undo' function only if the 'do' code
succeeded.  Your code also avoids a problem with many nested try/
finally blocks.  But for the simple chdir example you gave, I think
'wrong' isn't the word you were looking for regarding the try/finally
example I gave.

Anyway, I'll keep your code in mind the next time I want to avoid a
bunch of nested try/finally blocks.


From wanderer at dialup4less.com  Thu Mar  4 15:49:08 2010
From: wanderer at dialup4less.com (Wanderer)
Date: Thu, 4 Mar 2010 12:49:08 -0800 (PST)
Subject: Pylint Argument number differs from overridden method
References: <2484ca6e-0eb9-4e0c-a7db-d035badab711@t20g2000yqe.googlegroups.com>
	<mailman.226.1267644846.23598.python-list@python.org>
	<9ca2e014-f238-4b55-8ace-f884b2112a19@z11g2000yqz.googlegroups.com>
	<mailman.276.1267699533.23598.python-list@python.org>
Message-ID: <e4d29c98-ad6b-4e6c-9465-c333e1e0153f@q21g2000yqm.googlegroups.com>

On Mar 4, 5:45?am, Jean-Michel Pichavant <jeanmic... at sequans.com>
wrote:
> Wanderer wrote:
> > On Mar 3, 2:33 pm, Robert Kern <robert.k... at gmail.com> wrote:
>
> >> On 2010-03-03 11:39 AM, Wanderer wrote:
>
> >>> Pylint W0221 gives the warning
> >>> Argument number differs from overridden method.
>
> >>> Why is this a problem? I'm overriding the method to add additional
> >>> functionality.
>
> >> There are exceptions to every guideline. Doing this could easily be a mistake,
> >> so it's one of the many things that Pylint checks for. Silence the warning if
> >> you like.
>
> >> --
> >> Robert Kern
>
> >> "I have come to believe that the whole world is an enigma, a harmless enigma
> >> ? that is made terrible by our own mad attempt to interpret it as though it had
> >> ? an underlying truth."
> >> ? ?-- Umberto Eco
>
> > Thanks I was just wondering if I was overlooking something about
> > inheritance.
>
> This is only my opinion but you get this warning because of 2 disctinct
> issues:
> 1/ you just made a basic mistake in your signature and need to correct it
> 2/ you did not make any mistake in the signature, but this warning may
> reveal a (small) flaw in your class design.
>
> I don't know the exact context for your code, but it's better to have a
> consistant interface over your methods and mask the implementation
> details from the user.
> In your case, the getRays method may always ask for the lambda
> parameters and just ignore it for one of its implementation.
>
> And don't write empty doctrings to trick pylint. Either write them, or
> remove this rule, you are loosing all the tool benefits.
>
> JM

Okay different example. I'm not really using inheritance here but its
the same idea.
The wx.SpinCtrl is annoyingly integer. I want decimal values. so I
created dSpinCtrl.
It adds the argument places. It's a drop in replacement for SpinCtrl.
(okay its not, because I didn't create all the members). If you
replace SpinCtrl with dSpinCtrl the program should work the same
because the new argument places has a default value. I don't see a
problem with more arguments. Less arguments would be a problem.
Expanding functionality from a base class is what I thought
inheritance is about.

class dSpinCtrl():
    """Adds decimal values to SpinCtrl. Almost a drop in replacement
for SpinCtrl.
    Adds 'places' variable for number of places after decimal point
    """

    def __init__ (self,
                  parent,
                  iD = ID_SPIN,
                  value = wx.EmptyString,
                  pos = wx.DefaultPosition,
                  size = wx.DefaultSize,
                  style = wx.SP_ARROW_KEYS,
                  dmin = -100.0,
                  dmax = 100.0,
                  dinitial = 0.0,
                  places = 0):




From sccolbert at gmail.com  Thu Mar  4 16:00:02 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Thu, 4 Mar 2010 16:00:02 -0500
Subject: loop over list and process into groups
In-Reply-To: <865d59ab-585b-4908-be0d-e891d0a0a08b@t23g2000yqt.googlegroups.com>
References: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>
	<5e9126f7-f9e2-4c38-8dd5-dc174204fd71@d27g2000yqf.googlegroups.com>
	<865d59ab-585b-4908-be0d-e891d0a0a08b@t23g2000yqt.googlegroups.com>
Message-ID: <7f014ea61003041300j98500a2y89f414878753b397@mail.gmail.com>

Man, deja-vu, I could have sworn I read this thread months ago...

On Thu, Mar 4, 2010 at 2:18 PM, nn <pruebauno at latinmail.com> wrote:

>
>
> lbolla wrote:
> > On Mar 4, 3:57 pm, Sneaky Wombat <joe.hr... at gmail.com> wrote:
> > > [ {'vlan_or_intf': 'VLAN2021'},
> > >  {'vlan_or_intf': 'Interface'},
> > >  {'vlan_or_intf': 'Po1'},
> > >  {'vlan_or_intf': 'Po306'},
> > >  {'vlan_or_intf': 'VLAN2022'},
> > >  {'vlan_or_intf': 'Interface'},
> > >  {'vlan_or_intf': 'Gi7/33'},
> > >  {'vlan_or_intf': 'Po1'},
> > >  {'vlan_or_intf': 'Po306'},
> > >  {'vlan_or_intf': 'VLAN2051'},
> > >  {'vlan_or_intf': 'Interface'},
> > >  {'vlan_or_intf': 'Gi9/6'},
> > >  {'vlan_or_intf': 'VLAN2052'},
> > >  {'vlan_or_intf': 'Interface'},
> > >  {'vlan_or_intf': 'Gi9/6'},]
> > >
> > > I want it to be converted to:
> > >
> > > [{'2021':['Po1','Po306']},{'2022':['Gi7/33','Po1','Po306']},etc etc]
> > >
> > > I was going to write a def to loop through and look for certain pre-
> > > compiled regexs, and then put them in a new dictionary and append to a
> > > list, but I'm having trouble thinking of a good way to capture each
> > > dictionary.  Each dictionary will have a key that is the vlan and the
> > > value will be a list of interfaces that participate in that vlan.
> > > Each list will be variable, many containing only one interface and
> > > some containing many interfaces.
> > >
> > > I thought about using itertools, but i only use that for fixed data.
> > > I don't know of a good way to loop over variably sized data.  I was
> > > wondering if anyone had any ideas about a good way to convert this
> > > list or dictionary into the right format that I need.  The solution I
> > > come up with will most likely be ugly and error prone, so I thought
> > > i'd ask this python list while I work.  Hopefully I learn a better way
> > > to solve this problem.
> > >
> > > Thanks!
> > >
> > > I also have the data in a list,
> > >
> > > [ 'VLAN4065',
> > >  'Interface',
> > >  'Gi9/6',
> > >  'Po2',
> > >  'Po3',
> > >  'Po306',
> > >  'VLAN4068',
> > >  'Interface',
> > >  'Gi9/6',
> > >  'VLAN4069',
> > >  'Interface',
> > >  'Gi9/6',]
> >
> >
> >
> > ===================================
> >
> > from itertools import groupby
> >
> > data = \
> > [ {'vlan_or_intf': 'VLAN2021'},
> >  {'vlan_or_intf': 'Interface'},
> >  {'vlan_or_intf': 'Po1'},
> >  {'vlan_or_intf': 'Po306'},
> >  {'vlan_or_intf': 'VLAN2022'},
> >  {'vlan_or_intf': 'Interface'},
> >  {'vlan_or_intf': 'Gi7/33'},
> >  {'vlan_or_intf': 'Po1'},
> >  {'vlan_or_intf': 'Po306'},
> >  {'vlan_or_intf': 'VLAN2051'},
> >  {'vlan_or_intf': 'Interface'},
> >  {'vlan_or_intf': 'Gi9/6'},
> >  {'vlan_or_intf': 'VLAN2052'},
> >  {'vlan_or_intf': 'Interface'},
> >  {'vlan_or_intf': 'Gi9/6'},]
> >
> > def clean_up(lst):
> >       return [d.values()[0] for d in data if d.values()[0] !=
> 'Interface']
> >
> > out = {}
> > for k, g in groupby(clean_up(data) , key=lambda s:
> > s.startswith('VLAN')):
> >       if k:
> >               key = list(g)[0].replace('VLAN','')
> >       else:
> >               out[key] = list(g)
> >
> > print out
> > ===================================
> >
> > hth,
> > L.
>
> Good use of groupby. Here is what I ended up coming up:
>
> from itertools import groupby
> laninfo=[ 'VLAN4065',
>  'Interface',
>  'Gi9/6',
>  'Po2',
>  'Po3',
>  'Po306',
>  'VLAN4068',
>  'Interface',
>  'Gi9/6',
>  'VLAN4069',
>  'Interface',
>  'Gi9/6',]
>
> def splitgrp(s, f=[False]):
>   f[0]^=s.startswith('VLAN')
>   return f[0]
> lanlst=(list(g) for k,g in groupby(laninfo,key=splitgrp))
> out={item[0][4:]:item[2:] for item in lanlst}
> print(out)
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From mrmakent at gmail.com  Thu Mar  4 16:12:01 2010
From: mrmakent at gmail.com (Mike Kent)
Date: Thu, 4 Mar 2010 13:12:01 -0800 (PST)
Subject: A "scopeguard" for Python
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<hmm0rd$a48$1@news.eternal-september.org>
	<mailman.211.1267636174.23598.python-list@python.org> 
	<hmm5ln$arg$1@news.eternal-september.org>
	<mailman.277.1267699818.23598.python-list@python.org> 
	<hmokot$uso$1@news.eternal-september.org>
	<mailman.293.1267718664.23598.python-list@python.org> 
	<hmop33$rrj$1@news.eternal-september.org>
	<mailman.303.1267723835.23598.python-list@python.org>
Message-ID: <6af3c613-3439-484b-83f1-49213f1ed574@k17g2000yqb.googlegroups.com>

On Mar 4, 12:30?pm, Robert Kern <robert.k... at gmail.com> wrote:

> He's ignorant of the use cases of the with: statement, true.

<humor> Ouch!  Ignorant of the use cases of the with statement, am I?
Odd, I use it all the time. </humor>

> Given only your
> example of the with: statement, it is hard to fault him for thinking that try:
> finally: wouldn't suffice.

<humor> Damn me with faint praise, will you? </humor>

I'm kinda amazed at the drama my innocent request for the use case
elicited.  From what I've gotten so far from this thread, for the
actual example Mr. Steinbach used, the only disadvantage to my counter-
example using try/finally is that the chdir in the finally part will
always be executed, even if the chdir in the try part did not
succeed.  I concede that, and was aware of it when I wrote it.  For
the simple example given, I did not consider it compelling.  A more
complex example, that would have required multiple, nested try/finally
blocks, would show the advantages of Mr Steinbach's recipe more
clearly.

However, I fail to understand his response that I must have meant try/
else instead, as this, as Mr. Kern pointed out, is invalid syntax.
Perhaps Mr. Steinbach would like to give an example?


From jjposner at optimum.net  Thu Mar  4 16:17:20 2010
From: jjposner at optimum.net (John Posner)
Date: Thu, 04 Mar 2010 16:17:20 -0500
Subject: Method / Functions - What are the differences?
In-Reply-To: <4B8EF717.3070701@optimum.net>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
	<mailman.109.1267539415.23598.python-list@python.org>
	<hmk1mn$70u$1@newsreader3.netcologne.de>
	<4b8e4041$0$17447$426a34cc@news.free.fr>
	<hmlte9$d0f$1@dough.gmane.org>
	<mailman.205.1267633968.23598.python-list@python.org>
	<4b8e9660$0$21812$426a34cc@news.free.fr>
	<hmmrh4$644$1@newsreader3.netcologne.de>
	<4B8EF717.3070701@optimum.net>
Message-ID: <4b902338$0$31260$607ed4bc@cv.net>

On 3/3/2010 6:56 PM, John Posner wrote:
>
> ... I was thinking
> today about "doing a Bruno", and producing similar pieces on:
>
> * properties created with the @property decorator
>
> * the descriptor protocol
>
> I'll try to produce something over the next couple of days.
>

Starting to think about a writeup on Python properties, I've discovered 
that the official Glossary [1] lacks an entry for "property" -- it's 
missing in both Py2 and Py3!

Here's a somewhat long-winded definition -- comments, please:

---------------------------------------------
An attribute, *a*, of an object, *obj*, is said to be implemented as a 
property if the standard ways of accessing the attribute:

  * evaluation:      print obj.a
  * assignment:      obj.a = 42
  * deletion:        del obj.a

... cause methods of a user-defined *property object* to be invoked. The 
attribute is created as a class attribute, not an instance attribute. 
Example:

   class Widget:
       # create "color" as class attribute, not within __init__()
       color = <<property-object>>

       def __init__(self, ...):
           # do not define "self.color" instance attribute

The property object can be created with the built-in function 
property(), which in some cases can be coded as a decorator: @property. 
The property object can also be an instance of a class that implements 
the descriptor protocol.
---------------------------------------------

Tx,
John

[1]  http://docs.python.org/glossary.html


From mrmakent at gmail.com  Thu Mar  4 16:19:44 2010
From: mrmakent at gmail.com (Mike Kent)
Date: Thu, 4 Mar 2010 13:19:44 -0800 (PST)
Subject: A "scopeguard" for Python
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<mailman.209.1267635630.23598.python-list@python.org>
Message-ID: <cf51c311-7354-4e89-ab2e-45bb8b66d67d@z35g2000yqd.googlegroups.com>

On Mar 3, 12:00?pm, Robert Kern <robert.k... at gmail.com> wrote:
> On 2010-03-03 09:39 AM, Mike Kent wrote:
>
> > What's the compelling use case for this vs. a simple try/finally?
>
> > ? ? original_dir = os.getcwd()
> > ? ? try:
> > ? ? ? ? os.chdir(somewhere)
> > ? ? ? ? # Do other stuff
> > ? ? finally:
> > ? ? ? ? os.chdir(original_dir)
> > ? ? ? ? # Do other cleanup
>
> A custom-written context manager looks nicer and can be more readable.
>
> from contextlib import contextmanager
> import os
>
> @contextmanager
> def pushd(path):
> ? ? ?original_dir = os.getcwd()
> ? ? ?os.chdir(path)
> ? ? ?try:
> ? ? ? ? ?yield
> ? ? ?finally:
> ? ? ? ? ?os.chdir(original_dir)
>
> with pushd(somewhere):
> ? ? ?...

Robert, I like the way you think.  That's a perfect name for that
context manager!  However, you can clear one thing up for me... isn't
the inner try/finally superfluous?  My understanding was that there
was an implicit try/finally already done which will insure that
everything after the yield statement was always executed.


From news123 at free.fr  Thu Mar  4 16:24:59 2010
From: news123 at free.fr (News123)
Date: Thu, 04 Mar 2010 22:24:59 +0100
Subject: _winreg and access registry settings of another user
Message-ID: <4b90252b$0$17806$426a34cc@news.free.fr>

Hi,

I habe administrator privilege  on a window host and would like to write
a script setting some registry entries for other users.




There are potentially at least two wo ways of doing this:

1.) start a subprocess as other user and change the regitrey for
CURRENT_USER

However I don't know how to start a process (or ideally just a thread)
as another user with python.


2.) Load the 'hive' of the othe user and chnage the registry.

It seems, that one has to load the 'hive' of a different user in order
to have access to somebody eleses registry entries.

I did not find any documetnation of how to load a 'hive' wit the library
_winreg or another python library/


Did anybody else try already something similiar?


thanks in advance for pointers



bye


N





From jpiitula at ling.helsinki.fi  Thu Mar  4 16:40:39 2010
From: jpiitula at ling.helsinki.fi (Jussi Piitulainen)
Date: 04 Mar 2010 23:40:39 +0200
Subject: Partly erratic wrong behaviour, Python 3, lxml
References: <qotr5o0xt3l.fsf@ruuvi.it.helsinki.fi>
	<mailman.308.1267729874.23598.python-list@python.org>
Message-ID: <qotlje7ydd4.fsf@ruuvi.it.helsinki.fi>

Stefan Behnel writes:
> Jussi Piitulainen, 04.03.2010 11:46:
> > I am observing weird semi-erratic behaviour that involves Python 3
> > and lxml, is extremely sensitive to changes in the input data, and
> > only occurs when I name a partial result. I would like some help
> > with this, please. (Python 3.1.1; GNU/Linux; how do I find lxml
> > version?)
> 
> Here's how to find the version:
> 
> http://codespeak.net/lxml/FAQ.html#i-think-i-have-found-a-bug-in-lxml-what-should-i-do

Ok, thank you. Here's the results:

>>> print(et.LXML_VERSION, et.LIBXML_VERSION,
...       et.LIBXML_COMPILED_VERSION, et.LIBXSLT_VERSION,
...       et.LIBXSLT_COMPILED_VERSION)
(2, 2, 4, 0) (2, 6, 26) (2, 6, 26) (1, 1, 17) (1, 1, 17)

> I'll give your test code a try when I get to it. However, note that
> the best place to discuss this is the lxml mailing list:
> 
> http://codespeak.net/mailman/listinfo/lxml-dev

Thank you. Two things, however. First, I snipped out most of the XML
document in that post, so it won't be runnable as is. As I think I
said, my attempts to edit it down to size made the bug hide
itself. Second, it's very sensitive to any changes in that XML.

Oh, and a third thing. I'm not at all sure yet that the bug is in
lxml. It seems to me that Python itself does impossible things - I
hope I'm just being blind to something obvious, really.

But if you like to try it out, I'll post the full test data as a
followup to this. It's just bogus test data.


From deets at nospam.web.de  Thu Mar  4 16:43:12 2010
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Thu, 04 Mar 2010 22:43:12 +0100
Subject: python SUDS library
In-Reply-To: <28ed0127-8b71-4327-954c-c9100b4768de@v20g2000prb.googlegroups.com>
References: <28ed0127-8b71-4327-954c-c9100b4768de@v20g2000prb.googlegroups.com>
Message-ID: <7vanrgF97hU1@mid.uni-berlin.de>

Am 04.03.10 06:23, schrieb yamamoto:
> Hi,
> I tried to make a simple script with SUD library for caching torrent
> files. it doenst work!
>
> [versions]
> suds: 0.4, python: 2.6.4
>
> [code]
> from suds.client import Client
> import base64
>
> path = 'sample.torrent'
> doc = open(path, 'rb').read()
> encoded_doc = base64.b64encode(doc)
> url = 'http://torrage.com/api/torrage.wsdl'
> client = Client(url, cache=None)
> print client
> hash = client.service.cacheTorrent(encoded_doc)
> print hash
>
> [result]
>
> Suds ( https://fedorahosted.org/suds/ )  version: 0.4 (beta)  build:
> R663-20100303
>
> Service ( CacheService ) tns="urn:Torrage"
>     Prefixes (0)
>     Ports (1):
>        (CachePort)
>           Methods (1):
>              cacheTorrent(xs:string torrent, )
>           Types (0):
>
> Traceback (most recent call last):
>    File "C:\Documents and Settings\yamamoto\workspace\python\console
> \extract.py", line 13, in<module>
>      result = client.service.cacheTorrent(encoded_doc)
>    File "C:\Python26\lib\site-packages\suds\client.py", line 539, in
> __call__
>      return client.invoke(args, kwargs)
>    File "C:\Python26\lib\site-packages\suds\client.py", line 598, in
> invoke
>      result = self.send(msg)
>    File "C:\Python26\lib\site-packages\suds\client.py", line 627, in
> send
>      result = self.succeeded(binding, reply.message)
>    File "C:\Python26\lib\site-packages\suds\client.py", line 659, in
> succeeded
>      r, p = binding.get_reply(self.method, reply)
>    File "C:\Python26\lib\site-packages\suds\bindings\binding.py", line
> 143, in get_reply
>      replyroot = sax.parse(string=reply)
>    File "C:\Python26\lib\site-packages\suds\sax\parser.py", line 136,
> in parse
>      sax.parse(source)
>    File "C:\Python26\lib\xml\sax\expatreader.py", line 107, in parse
>      xmlreader.IncrementalParser.parse(self, source)
>    File "C:\Python26\lib\xml\sax\xmlreader.py", line 123, in parse
>      self.feed(buffer)
>    File "C:\Python26\lib\xml\sax\expatreader.py", line 211, in feed
>      self._err_handler.fatalError(exc)
>    File "C:\Python26\lib\xml\sax\handler.py", line 38, in fatalError
>      raise exception
> xml.sax._exceptions.SAXParseException:<unknown>:2:0: junk after
> document element
>
>
> this is a php code provided by torrage
> <?
>          $client = new SoapClient("http://torrage.com/api/
> torrage.wsdl");
>          $infoHash = $client-
>> cacheTorrent(base64_encode(file_get_contents("my.torrent")));
> ?>
>
> any suggestions?

Looks like the XML is malformed. Can you post it? You can insert 
print-statements into the library to do so, eg in line 143 of 
suds.bindings.binding.

Diez

Diez



From jpiitula at ling.helsinki.fi  Thu Mar  4 16:47:49 2010
From: jpiitula at ling.helsinki.fi (Jussi Piitulainen)
Date: 04 Mar 2010 23:47:49 +0200
Subject: Partly erratic wrong behaviour, Python 3, lxml
References: <qotr5o0xt3l.fsf@ruuvi.it.helsinki.fi>
	<mailman.308.1267729874.23598.python-list@python.org>
	<qotlje7ydd4.fsf@ruuvi.it.helsinki.fi>
Message-ID: <qothbovyd16.fsf@ruuvi.it.helsinki.fi>

This is the full data file on which my regress/Tribug exhibits the
behaviour that I find incomprehensible, described in the first post in
this thread. The comment in the beginning of the file below was
written before I commented out some records in the data, so the actual
numbers now are not ten expected, thirty sometimes observed, but the
wrong number is always the correct number tripled (5 and 15, I think).

---regress/tridata.py follows---
# Exercise lxml.etree.parse(body).xpath(title)
# which I think should always return a list of
# ten elements but sometimes returns thirty,
# with each of the ten in triplicate. And this
# seems impossible to me. Yet I see it happening.

body = b'''<OAI-PMH xmlns="http://www.openarchives.org/OAI/2.0/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/          http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd">
<responseDate>2010-03-02T09:38:47Z</responseDate>
<request verb="ListRecords" from="2004-01-01T00:00:00Z" until="2004-12-31T23:59:59Z" metadataPrefix="oai_dc">http://localhost/pmh/que</request>
<ListRecords>
<record>
<header><!-- x --><!-- -->
   <identifier>jrc32003R0055-pl.xml/2/0</identifier>
   <datestamp>2004-08-15T19:45:00Z</datestamp>
   <setSpec>pl</setSpec>
</header>
<metadata>
   <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc        http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
      <dc:title>Rozporz&#261;dzenie</dc:title>
   </oai_dc:dc>
</metadata>
</record>
<!-- <record>
<header>
   <identifier>jrc32003R0055-pl.xml/2/1</identifier>
   <datestamp>2004-08-15T19:45:00Z</datestamp>
   <setSpec>pl</setSpec>
</header>
<metadata>
   <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc        http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
      <dc:title>Komisji</dc:title>
   </oai_dc:dc>
</metadata>
</record>
<record>
<header>
   <identifier>jrc32003R0055-pl.xml/2/2</identifier>
   <datestamp>2004-08-15T19:45:00Z</datestamp>
   <setSpec>pl</setSpec>
</header>
<metadata>
   <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc        http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
      <dc:title>(WE)</dc:title>
   </oai_dc:dc>
</metadata>
</record>
<record>
<header>
   <identifier>jrc32003R0055-pl.xml/2/3</identifier>
   <datestamp>2004-08-15T19:45:00Z</datestamp>
   <setSpec>pl</setSpec>
</header>
<metadata>
   <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc        http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
      <dc:title>nr</dc:title>
   </oai_dc:dc>
</metadata>
</record>
<record>
<header>
   <identifier>jrc32003R0055-pl.xml/2/4</identifier>
   <datestamp>2004-08-15T19:45:00Z</datestamp>
   <setSpec>pl</setSpec>
</header>
<metadata>
   <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc        http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
      <dc:title>55/2003</dc:title>
   </oai_dc:dc>
</metadata>
</record>
<record>
<header>
   <identifier>jrc32003R0055-pl.xml/3/0</identifier>
   <datestamp>2004-08-15T19:45:00Z</datestamp>
   <setSpec>pl</setSpec>
</header>
<metadata>
   <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc        http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
      <dc:title>z</dc:title>
   </oai_dc:dc>
</metadata>
</record> -->
<record>
<header>
   <identifier>jrc32003R0055-pl.xml/3/1</identifier>
   <datestamp>2004-08-15T19:45:00Z</datestamp>
   <setSpec>pl</setSpec>
</header>
<metadata>
   <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc        http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
      <dc:title>dnia</dc:title>
   </oai_dc:dc>
</metadata>
</record>
<record>
<header>
   <identifier>jrc32003R0055-pl.xml/3/2</identifier>
   <datestamp>2004-08-15T19:45:00Z</datestamp>
   <setSpec>pl</setSpec>
</header>
<metadata>
   <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc        http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
      <dc:title>13</dc:title>
   </oai_dc:dc>
</metadata>
</record>
<record>
<header>
   <identifier>jrc32003R0055-pl.xml/3/3</identifier>
   <datestamp>2004-08-15T19:45:00Z</datestamp>
   <setSpec>pl</setSpec>
</header>
<metadata>
   <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc        http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
      <dc:title>stycznia</dc:title>
   </oai_dc:dc>
</metadata>
</record>
<record>
<header>
   <identifier>jrc32003R0055-pl.xml/3/4</identifier>
   <datestamp>2004-08-15T19:45:00Z</datestamp>
   <setSpec>pl</setSpec>
</header>
<metadata>
   <oai_dc:dc xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:dc="http://purl.org/dc/elements/1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc        http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
      <dc:title>2003</dc:title>
   </oai_dc:dc>
</metadata>
</record>
</ListRecords>
</OAI-PMH>
'''

title = '//*[name()="record"]//*[name()="dc:title"]'


From jgardner at jonathangardner.net  Thu Mar  4 16:54:45 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Thu, 4 Mar 2010 13:54:45 -0800
Subject: Evaluate my first python script, please
In-Reply-To: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
Message-ID: <6cc20cea1003041354s3cb5011cmbbaf39eefed7a4e4@mail.gmail.com>

On Thu, Mar 4, 2010 at 10:39 AM, Pete Emerson <pemerson at gmail.com> wrote:
>
> #!/usr/bin/python
>

More common:

#!/usr/bin/env python

> import sys, fileinput, re, os
>
> filename = '/etc/hosts'
>
> hosts = []
>
> for line in open(filename, 'r'):
> ? ? ? ?match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line)
> ? ? ? ?if match is None or re.search('^(?:float|localhost)\.', line):
> continue
> ? ? ? ?hostname = match.group(1)

In Python, we use REs as a last resort. See "dir("")" or "help("")"
for why we don't use REs if we can avoid them.

The above is better represented with:

try:
  ipaddr, hostnames = line.split(None, 1)
except IndexError:
  continue

if line.find('float') >=0 or line.find('localhost') >= 0:
  continue


> ? ? ? ?count = 0
> ? ? ? ?for arg in sys.argv[1:]:
> ? ? ? ? ? ? ? ?for section in hostname.split('.'):
> ? ? ? ? ? ? ? ? ? ? ? ?if section == arg:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?count = count + 1
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?break
> ? ? ? ?if count == len(sys.argv) - 1:
> ? ? ? ? ? ? ? ?hosts.append(hostname)
>

You can use the "else" in a "for". as well.

for arg in sys.argv[1:]:
         for section in hostname.split('.'):
                 if section == arg:
                         break
else: # Run only if for completes naturally
          hosts.append(hostname)


It may be clearer to do set arithmetic as well.

> if len(hosts) == 1:
> ? ? ? ?os.system("ssh -A " + hosts[0])

You probably want one of the os.exec* methods instead, since you
aren't going to do anything after this.

> else:
> ? ? ? ?print '\n'.join(hosts)

Rather, the idiom is usually:

for host in hosts:
  print host

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From mensanator at aol.com  Thu Mar  4 17:21:16 2010
From: mensanator at aol.com (Mensanator)
Date: Thu, 4 Mar 2010 14:21:16 -0800 (PST)
Subject: _winreg and access registry settings of another user
References: <4b90252b$0$17806$426a34cc@news.free.fr>
Message-ID: <917f4593-f50e-424c-a21b-04c376e77164@33g2000yqj.googlegroups.com>

On Mar 4, 3:24?pm, News123 <news... at free.fr> wrote:
> Hi,
>
> I habe administrator privilege ?on a window host and would like to write
> a script setting some registry entries for other users.

Why? Are you writing a virus?

>
> There are potentially at least two wo ways of doing this:
>
> 1.) start a subprocess as other user and change the regitrey for
> CURRENT_USER
>
> However I don't know how to start a process (or ideally just a thread)
> as another user with python.
>
> 2.) Load the 'hive' of the othe user and chnage the registry.
>
> It seems, that one has to load the 'hive' of a different user in order
> to have access to somebody eleses registry entries.
>
> I did not find any documetnation of how to load a 'hive' wit the library
> _winreg or another python library/
>
> Did anybody else try already something similiar?
>
> thanks in advance for pointers
>
> bye
>
> N



From fabiofz at gmail.com  Thu Mar  4 17:25:20 2010
From: fabiofz at gmail.com (Fabio Zadrozny)
Date: Thu, 4 Mar 2010 19:25:20 -0300
Subject: Pydev 1.5.5 Released
Message-ID: <cfb578b21003041425v1fbe077x7cf8abaeb46ea1d9@mail.gmail.com>

Hi All,

Pydev 1.5.5 has been released

Details on Pydev: http://pydev.org
Details on its development: http://pydev.blogspot.com

Release Highlights:
-------------------------------

* Predefined completions available for code completion:

    * Predefined completions may be created for use when sources are
not available
    * Can also be used for providing better completions for compiled
modules (e.g.: PyQt, wx, etc.)
    * Defined in .pypredef files (which are plain Python code)
    * Provides a way for generating those from a QScintilla .api file
(experimental)
    * See Predefined Completions in manual for more info

* Pydev Package Explorer:

    * Showing the contents of the PYTHONPATH from the interpreter for
each project
    * Shows the folder containing the python interpreter executable
(to browse for docs, scripts, etc)
    * Allows opening files in the interpreter PYTHONPATH (even inside zip files)

* Editor options:

    * Find/replace dialog has option to search in currently opened editors
    * Move line up/down can move considering Python indentation (not default)
    * Simple token completions can have a space or a space and colon
added when applied. E.g.: print, if, etc (not default)

* Refactoring:

    * Fixed InvalidThreadAccess on refactoring
    * Fixed problem doing refactoring on external files (no file was found)

* Globals Browser (Ctrl+Shift+T):

    * No longer throwing NullPointerException when the interpreter is
no longer available for a previously found token

* General:

    * When creating a new pydev project, the user will be asked before
changing to the pydev perspective
    * Only files under source folders are analyzed (files in the
external source folders would be analyzed if they happened to be in
the Eclipse workspace)
    * Interactive console now works properly on non-english systems
    * Hover working over tokens from compiled modules (e.g.: file,
file.readlines)
    * JYTHONPATH environment variable is set on Jython (previously
only the PYTHONPATH was set)
    * Fixed path translation issues when using remote debugger
    * Fixed issue finding definition for a method of a locally created token




What is PyDev?
---------------------------

PyDev is a plugin that enables users to use Eclipse for Python, Jython
and IronPython development -- making Eclipse a first class Python IDE
-- It comes with many goodies such as code completion, syntax
highlighting, syntax analysis, refactor, debug and many others.


Cheers,

-- 
Fabio Zadrozny
------------------------------------------------------
Software Developer

Aptana
http://aptana.com/python

Pydev - Python Development Environment for Eclipse
http://pydev.org
http://pydev.blogspot.com


From alfps at start.no  Thu Mar  4 17:27:03 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Thu, 04 Mar 2010 23:27:03 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <6af3c613-3439-484b-83f1-49213f1ed574@k17g2000yqb.googlegroups.com>
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<hmm0rd$a48$1@news.eternal-september.org>
	<mailman.211.1267636174.23598.python-list@python.org>
	<hmm5ln$arg$1@news.eternal-september.org>
	<mailman.277.1267699818.23598.python-list@python.org>
	<hmokot$uso$1@news.eternal-september.org>
	<mailman.293.1267718664.23598.python-list@python.org>
	<hmop33$rrj$1@news.eternal-september.org>
	<mailman.303.1267723835.23598.python-list@python.org>
	<6af3c613-3439-484b-83f1-49213f1ed574@k17g2000yqb.googlegroups.com>
Message-ID: <hmpc3r$2il$1@news.eternal-september.org>

* Mike Kent:
> On Mar 4, 12:30 pm, Robert Kern <robert.k... at gmail.com> wrote:
> 
>> He's ignorant of the use cases of the with: statement, true.
> 
> <humor> Ouch!  Ignorant of the use cases of the with statement, am I?
> Odd, I use it all the time. </humor>
> 
>> Given only your
>> example of the with: statement, it is hard to fault him for thinking that try:
>> finally: wouldn't suffice.
> 
> <humor> Damn me with faint praise, will you? </humor>
> 
> I'm kinda amazed at the drama my innocent request for the use case
> elicited.  From what I've gotten so far from this thread, for the
> actual example Mr. Steinbach used, the only disadvantage to my counter-
> example using try/finally is that the chdir in the finally part will
> always be executed, even if the chdir in the try part did not
> succeed.  I concede that, and was aware of it when I wrote it.  For
> the simple example given, I did not consider it compelling.

Uhm, well.

My example was:

   with Cleanup as at_cleanup:
       # blah blah
       chdir( somewhere )
       at_cleanup.call( lambda: chdir( original_dir ) )
       # blah blah

It was not intended to compel, rather just to illustrate usage. :-)

And you asked about comparing that with ...

    original_dir = os.getcwd()
    try:
        os.chdir(somewhere)
        # Do other stuff
    finally:
        os.chdir(original_dir)
        # Do other cleanup

.. which does something different, namely, always executing the 
os.chdir(original_dir) or more generally the action-specific cleanup.

The action-specific cleanup might be much more costly than a chdir, and/or, in 
the case where the action failed, incorrect.

In the same number of lines and with fewer keystrokes you could have written 
code that was equivalent to the code I posted and that you wanted to compare 
with, e.g. ...

    original_dir = os.getcwd()
    os.chdir(somewhere)
    try:
        # Do other stuff
    finally:
        os.chdir(original_dir)
        # Do other cleanup

... so given how easy it is to write such an equivalent code snippet, I assumed 
that the different behavior was /not/ intended, that instead, you'd attempted to 
write equivalent code but made a slight error in the translation to lower level 
construct  --  but impossible to say exactly what.

Now you write that you were "aware of [the different behavior] when I wrote it", 
and that just baffles me: why not then, as a basis of sound comparision, write 
the equivalent code shown above, the same number of lines as what you wrote?


>  A more
> complex example, that would have required multiple, nested try/finally
> blocks, would show the advantages of Mr Steinbach's recipe more
> clearly.
> 
> However, I fail to understand his response that I must have meant try/
> else instead, as this, as Mr. Kern pointed out, is invalid syntax.
> Perhaps Mr. Steinbach would like to give an example?

OK.

Assuming that you wanted the chdir to be within a try block (which it was in 
your code), then to get code equivalent to my code, for the purpose of a 
comparision of codes that do the same, you'd have to write something like ...

    original_dir = os.getcwd()
    try:
        os.chdir(somewhere)
    except Whatever:
        # E.g. log it.
        raise
    else:
        try:
            # Do other stuff
        finally:
            os.chdir(original_dir)
            # Do other cleanup

... which would be a more general case.

I've also given this example in response to Robert earlier in the thread. 
Although I haven't tried it I believe it's syntactically valid. If not, then the 
relevant typo should just be fixed. :-)

I have no idea which construct Robert thought was syntactically invalid. I think 
that if he's written that, then it must have been something he thought of.


Cheers & hth.,

- Alf


From sjdevnull at yahoo.com  Thu Mar  4 17:55:07 2010
From: sjdevnull at yahoo.com (sjdevnull at yahoo.com)
Date: Thu, 4 Mar 2010 14:55:07 -0800 (PST)
Subject: Evaluate my first python script, please
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
Message-ID: <692c83be-0075-470f-a970-8e5c5c301eb0@g7g2000yqe.googlegroups.com>

On Mar 4, 1:39?pm, Pete Emerson <pemer... at gmail.com> wrote:
> I've written my first python program, and would love suggestions for
> improvement.
>
> I'm a perl programmer and used a perl version of this program to guide
> me. So in that sense, the python is "perlesque"
>
> This script parses /etc/hosts for hostnames, and based on terms given
> on the command line (argv), either prints the list of hostnames that
> match all the criteria, or uses ssh to connect to the host if the
> number of matches is unique.
>
> I am looking for advice along the lines of "an easier way to do this"
> or "a more python way" (I'm sure that's asking for trouble!) or
> "people commonly do this instead" or "here's a slick trick" or "oh,
> interesting, here's my version to do the same thing".
>
> I am aware that there are performance improvements and error checking
> that could be made, such as making sure the file exists and is
> readable and precompiling the regular expressions and not calculating
> how many sys.argv arguments there are more than once. I'm not hyper
> concerned with performance or idiot proofing for this particular
> script.
>
> Thanks in advance.
>
> ########################################################
> #!/usr/bin/python
>
> import sys, fileinput, re, os

'Some people, when confronted with a problem, think "I know, I?ll use
regular expressions." Now they have two problems.' ? Jamie Zawinski

Seriously, regexes can be very useful but there's no need for them
here.  Simpler is usually better, and easier to understand.

> filename = '/etc/hosts'
>
> hosts = []
>
> for line in open(filename, 'r'):
> ? ? ? ? match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line)
> ? ? ? ? if match is None or re.search('^(?:float|localhost)\.', line):
> continue
> ? ? ? ? hostname = match.group(1)

I find this much clearer without regexes:

try:
    ip, hostname = line.strip().split(None, 1)
except IndexError:
    continue
# I think this is equivalent to your re, but I'm not sure it's what
# you actually meant...
#if line.startswith("float.") or line.startswith("localhost."):
#    continue
# I'm going with:
if hostname.startswith("float.") or hostname.startswith("localhost"):
    continue


> ? ? ? ? count = 0
> ? ? ? ? for arg in sys.argv[1:]:
> ? ? ? ? ? ? ? ? for section in hostname.split('.'):
> ? ? ? ? ? ? ? ? ? ? ? ? if section == arg:
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? count = count + 1
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? break
> ? ? ? ? if count == len(sys.argv) - 1:
> ? ? ? ? ? ? ? ? hosts.append(hostname)

A perfect application of sets.

#initialize at program outset
args = set(sys.argv[1:])
...
hostparts = set(hostname.split("."))
if hostparts & args:
    hosts.append(hostname)


Full program:

import sys
import os
filename = '/etc/hosts'

hosts = []
args = set(sys.argv[1:])
for line in open(filename, 'r'):
    # Parse line into ip address and hostname, skipping bogus lines
    try:
        ipaddr, hostname = line.strip().split(None, 1)
    except ValueError:
        continue
    if hostname.startswith("float.") or
hostname.startswith("localhost."):
            continue

    # Add to hosts if it matches at least one argument
    hostparts = set(hostname.split("."))
    if hostparts & args:
        hosts.append(hostname)

# If there's only one match, ssh to it--otherwise print out the
matches
if len(hosts) == 1:
    os.system("ssh -A %s"%hosts[0])
else:
    for host in hosts:
        print host


From python at bdurham.com  Thu Mar  4 18:10:06 2010
From: python at bdurham.com (python at bdurham.com)
Date: Thu, 04 Mar 2010 18:10:06 -0500
Subject: Looking for the mysterious zlib.py* files in Python 2.6.4 (32-bit) for
	Windows
In-Reply-To: <1267743672.16774.1363182565@webmail.messagingengine.com>
References: <1267743672.16774.1363182565@webmail.messagingengine.com>
Message-ID: <1267744206.18232.1363186281@webmail.messagingengine.com>

In the process of building an EXE with py2exe, I noticed that
there's no physical zlib files anywhere on my workstation.

I can import zlib and use this module's features without problem.
But when I query zlib.__file__, I get back an empty string.

Where does the zlib code live? Is zlib a <built-in> in 2.6?

The reason I question its '<built-in>' status is that when
analyzing my 2.6 based Py2exe produced executables with
DependencyWalker, I see references to a zlib.pyd file that
doesn't exist anywhere on my system. I wonder if this is
something I should be concerned about?

Can someone explain this mystery to me?

Thank you,
Malcolm


From alfps at start.no  Thu Mar  4 18:52:04 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Fri, 05 Mar 2010 00:52:04 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.314.1267744631.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>	<hmn03d$5r6$1@news.eternal-september.org>	<mailman.292.1267717742.23598.python-list@python.org>	<hmooo6$pg0$1@news.eternal-september.org>	<mailman.300.1267723245.23598.python-list@python.org>	<hmoul7$2i9$1@news.eternal-september.org>
	<mailman.314.1267744631.23598.python-list@python.org>
Message-ID: <hmph3b$20o$1@news.eternal-september.org>

* Robert Kern:
> On 2010-03-04 12:37 PM, Alf P. Steinbach wrote:
>> * Robert Kern:
>>> On 2010-03-04 10:56 AM, Alf P. Steinbach wrote:
>>>> * Robert Kern:
>>>>> On 2010-03-03 18:49 PM, Alf P. Steinbach wrote:
>> [snippety]
>>>>>
>>>>>> If you call the possibly failing operation "A", then that systematic
>>>>>> approach goes like this: if A fails, then it has cleaned up its own
>>>>>> mess, but if A succeeds, then it's the responsibility of the calling
>>>>>> code to clean up if the higher level (multiple statements) operation
>>>>>> that A is embedded in, fails.
>>>>>>
>>>>>> And that's what Marginean's original C++ ScopeGuard was designed for,
>>>>>> and what the corresponding Python Cleanup class is designed for.
>>>>>
>>>>> And try: finally:, for that matter.
>>>>
>>>> Not to mention "with".
>>>>
>>>> Some other poster made the same error recently in this thread; it is a
>>>> common fallacy in discussions about programming, to assume that since
>>>> the same can be expressed using lower level constructs, those are all
>>>> that are required.
>>>>
>>>> If adopted as true it ultimately means the removal of all control
>>>> structures above the level of "if" and "goto" (except Python doesn't
>>>> have "goto").
>>>
>>> What I'm trying to explain is that the with: statement has a use even
>>> if Cleanup doesn't. Arguing that Cleanup doesn't improve on try:
>>> finally: does not mean that the with: statement doesn't improve on
>>> try: finally:.
>>
>> That's a different argument, essentially that you see no advantage for
>> your current coding patterns.
>>
>> It's unconnected to the argument I responded to.
>>
>> The argument that I responded to, that the possibility of expressing
>> things at the level of try:finally: means that a higher level construct
>> is superfluous, is still meaningless.
> 
> I am attacking your premise that the "with Cleanup():" construct is 
> higher level than try: finally:. It isn't. It provides the same level of 
> abstraction as try: finally:.
> 
> This is distinct from the accepted uses of the with: statement which 
> *are* higher level than try: finally: and which do confer practical 
> benefits over using try: finally: despite being syntactical sugar for 
> try: finally:.
> 
>>>>>>> Both formulations can be correct (and both work perfectly fine with
>>>>>>> the chdir() example being used). Sometimes one is better than the
>>>>>>> other, and sometimes not. You can achieve both ways with either your
>>>>>>> Cleanup class or with try: finally:.
>>>>>>>
>>>>>>> I am still of the opinion that Cleanup is not an improvement over
>>>>>>> try:
>>>>>>> finally: and has the significant ugliness of forcing cleanup code
>>>>>>> into
>>>>>>> callables. This significantly limits what you can do in your cleanup
>>>>>>> code.
>>>>>>
>>>>>> Uhm, not really. :-) As I see it.
>>>>>
>>>>> Well, not being able to affect the namespace is a significant
>>>>> limitation. Sometimes you need to delete objects from the namespace in
>>>>> order to ensure that their refcounts go to zero and their cleanup code
>>>>> gets executed.
>>>>
>>>> Just a nit (I agree that a lambda can't do this, but as to what's
>>>> required): assigning None is sufficient for that[1].
>>>
>>> Yes, but no callable is going to allow you to assign None to names in
>>> that namespace, either. Not without sys._getframe() hackery, in any 
>>> case.
>>>
>>>> However, note that the current language doesn't guarantee such cleanup,
>>>> at least as far as I know.
>>>>
>>>> So while it's good practice to support it, to do everything to let it
>>>> happen, it's presumably bad practice to rely on it happening.
>>>>
>>>>
>>>>> Tracebacks will keep the namespace alive and all objects in it.
>>>>
>>>> Thanks!, I hadn't thought of connecting that to general cleanup 
>>>> actions.
>>>>
>>>> It limits the use of general "with" in the same way.
>>>
>>> Not really.
>>
>> Sorry, it limits general 'with' in /exactly/ the same way.
>>
>>> It's easy to write context managers that do that [delete objects from
>>> the namespace].
>>
>> Sorry, no can do, as far as I know; your following example quoted below
>> is an example of /something else/.
> 
> Okay, so what do you mean by 'the use of general "with"'? I'm talking 
> about writing a context manager or using the @contextmanager decorator 
> to do some initialization and then later cleaning up that 
> initialization. That cleaning up may entail deleting an object. You are 
> correct that the context manager can't affect the namespace of the with: 
> clause, but that's not the initialization that it would need to clean up.
> 
> Yes, you can write code with a with: statement where you try to clean up 
> stuff that happened inside of the clause (you did), but that's not how 
> the with: statement was ever intended to be used nor is it good practice 
> to do so because of that limitation. Context managers are designed to 
> initialize specific things, then clean them up. I thought you were 
> talking about the uses of the with: statement as described in PEP-343, 
> not every possible misuse of the with: statement.

I'm not the one talking about removing variables or that "it's easy to write 
context managers that do that".

You are the one talking about that.

So I have really not much to add.

It seems that you're now agreeing with me that former is not good practice and 
that the latter is impossible to do portably, but you now argue against your 
earlier stand as if that was something that I had put forward.

It's a bit confusing when you argue against your own statements.


>> And adding on top of irrelevancy, for the pure technical aspect it can
>> be accomplished in the same way using Cleanup (I provide an example 
>> below).
>>
>> However, doing that would generally be worse than pointless since with
>> good coding practices the objects would become unreferenced anyway.
>>
>>
>>> You put the initialization code in the __enter__() method, assign
>>> whatever objects you want to keep around through the with: clause as
>>> attributes on the manager, then delete those attributes in the
>>> __exit__().
>>
>> Analogously, if one were to do this thing, then it could be accomplished
>> using a Cleanup context manager as follows:
>>
>> foo = lambda: None
>> foo.x = create_some_object()
>> at_cleanup.call( lambda o = foo: delattr( o, "x" ) )
>>
>> ... except that
>>
>> 1) for a once-only case this is less code :-)
> 
> Not compared to a try: finally:, it isn't.

Again, this context shifting is bewildering. As you can see, quoted above, you 
were talking about a situation where you would have defined a context manager, 
presumably because a 'try' would not in your opinion be simpler for whatever it 
was that you had in mind. But you are responding to the code I offered as if it 
was an alternative to something where you would find a 'try' to be simplest.


>> 2) it is a usage that I wouldn't recommend; instead I recommend adopting
>> good
>> coding practices where object references aren't kept around.
> 
> Many of the use cases of the with: statement involve creating an object 
> (like a lock or a transaction object), keeping it around for the 
> duration of the "# Do stuff" block, and then finalizing it.
> 
>>> Or, you use the @contextmanager decorator to turn a generator into a
>>> context manager, and you just assign to local variables and del them
>>> in the finally: clause.
>>
>> Uhm, you don't need a 'finally' clause when you define a context manager.
> 
> When you use the @contextmanager decorator, you almost always do. See 
> the Examples section of PEP 343:
> 
>   http://www.python.org/dev/peps/pep-0343/
> 
>> Additionally, you don't need to 'del' the local variables in
>> @contextmanager decorated generator.
>>
>> The local variables cease to exist automatically.
> 
> True.
> 
>>> What you can't do is write a generic context manager where the
>>> initialization happens inside the with: clause and the cleanup actions
>>> are registered callables. That does not allow you to affect the
>>> namespace.
>>
>> If you mean that you can't introduce direct local variables and have
>> them deleted by "registered callables" in a portable way, then right.
>>
>> But I can't think of any example where that would be relevant; in
>> particular what matters for supporting on-destruction cleanup is whether
>> you keep any references or not, not whether you have a local variable of
>> any given name.
> 
> Well, local variables keep references to objects. Variable assignment 
> followed by deletion is a very readable way to keep an object around for 
> a while then remove it later. If you have to go through less readable 
> contortions to keep the object around when it needs to be and clean it 
> up later, then that is a mark against your approach.

Sorry, as with the places noted above, I can't understand what you're trying to 
say here. I don't recommend coding practices where you keep object references 
around, and you have twice quoted that above. I don't have any clue what 
"contortions" you are talking about, it must be something that you imagine.


Cheers,

- Alf (three times baffled)


From mentifex at myuw.net  Thu Mar  4 18:52:36 2010
From: mentifex at myuw.net (Forthminder)
Date: Thu, 4 Mar 2010 15:52:36 -0800 (PST)
Subject: Google AI Challenge at U of Waterloo
References: <4152d196-6491-446b-bc69-5bf54109b354@k5g2000pra.googlegroups.com>
	<hkiqj0$dpj$1@news.eternal-september.org>
	<f1df3934-4604-49a1-bf11-7f3c885e10b1@q16g2000yqq.googlegroups.com>
	<hkjrm3$gt1$1@news.eternal-september.org>
Message-ID: <5b3da248-0ccb-4451-a322-0fcabe744b41@k5g2000pra.googlegroups.com>

Google AI Challenge post-mortem report by the winner is at

http://a1k0n.net/blah/archives/2010/03/index.html#e2010-03-04T14_00_21.txt

Mentifex
--
http://cyborg.blogspot.com
http://code.google.com/p/mindforth/wiki/AiHasBeenSolved


From pengyu.ut at gmail.com  Thu Mar  4 18:57:35 2010
From: pengyu.ut at gmail.com (Peng Yu)
Date: Thu, 4 Mar 2010 15:57:35 -0800 (PST)
Subject: highlight words by regex in pdf files using python
Message-ID: <af0830ae-1d24-4db9-b721-d6602fedd540@15g2000yqi.googlegroups.com>

I don't find a general pdf library in python that can do any
operations on pdfs.

I want to automatically highlight certain words (using regex) in a
pdf. Could somebody let me know if there is a tool to do so in python?


From pemerson at gmail.com  Thu Mar  4 18:59:58 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Thu, 4 Mar 2010 15:59:58 -0800 (PST)
Subject: Evaluate my first python script, please
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
	<692c83be-0075-470f-a970-8e5c5c301eb0@g7g2000yqe.googlegroups.com>
Message-ID: <fa344e19-c699-4ec5-9b44-f2aa47b818cd@k2g2000pro.googlegroups.com>

Great responses, thank you all very much. I read Jonathan Gardner's
solution first and investigated sets. It's clearly superior to my
first cut.

I love the comment about regular expressions. In perl, I've reached
for regexes WAY too much. That's a big lesson learned too, and from my
point of view not because of performance (although that's most likely
a bonus) but because of code readability.

Here's the version I have now. It looks quite similar to sjdevnull's.
Further comments appreciated, and thanks again.

#!/usr/bin/env python

import sys, fileinput, os

filename = '/etc/hosts'

hosts = []

search_terms = set(sys.argv[1:])

for line in open(filename, 'r'):
	if line.startswith('#'): continue
	try:
		hostname = line.strip().split('\t')[2]			# The host I want is always
at the 3rd tab.
	except IndexError:
		continue
	if hostname.startswith('float.') or
hostname.startswith('localhost.'):
		continue
	if search_terms <= set(hostname.split('.')):      # same as if
search_terms.issubset(hostname.split('.')):
		hosts.append(hostname)

if len(hosts) == 1:
	os.execl("/usr/bin/ssh", '-A', hosts[0])
else:
	for host in hosts:
		print host



From nobody at nowhere.com  Thu Mar  4 19:05:10 2010
From: nobody at nowhere.com (Nobody)
Date: Fri, 05 Mar 2010 00:05:10 +0000
Subject: Challenge: escape from the pysandbox
References: <201002261329.33740.victor.stinner@haypocalc.com>
	<hmeamq$a0$1@panix5.panix.com>
	<fbe2e2101002281440n419fbcb1v2cf3922db1cef6a4@mail.gmail.com>
	<mailman.159.1267583850.23598.python-list@python.org>
Message-ID: <pan.2010.03.05.00.04.47.422000@nowhere.com>

On Wed, 03 Mar 2010 03:37:44 +0100, Victor Stinner wrote:

>> I see, makes perfect sense. This then raises the question whether it's
>> important to have a 100% fool proof python sandbox without help from
>> the OS, or this goal is not only too ambitious but also not really a
>> useful one. 
> 
> This is just impossible :-) PHP tried that but it's too hard to write an 
> exhaustive blacklist because too much code have to be modified. If you
> require a 100% fool proof sandbox, you have to use a sandbox between the
> Python process and the OS (and not inside the Python process).

It's entirely feasible to implement a perfect sandbox at the language
level. But you have to design this in from the beginning. If you try to
retro-fit it, you end up either failing or with an entirely different
language.

A black-list approach won't work; you have to deny by default then
white-list "safe" functionality.



From nobody at nowhere.com  Thu Mar  4 19:09:39 2010
From: nobody at nowhere.com (Nobody)
Date: Fri, 05 Mar 2010 00:09:39 +0000
Subject: using subprocess.Popen  env parameter
References: <47f5881a-a7bd-4a57-8e2d-ae27cfbf3a9a@x22g2000yqx.googlegroups.com>
Message-ID: <pan.2010.03.05.00.09.17.266000@nowhere.com>

On Wed, 03 Mar 2010 09:05:47 -0800, enda man wrote:

> cl_path = ms_vc_path + '\VC\bin'

The backslash is used as an escape character within string literals.
Either use raw strings:

	cl_path = ms_vc_path + r'\VC\bin'

or escape the backslashes:

	cl_path = ms_vc_path + '\\VC\\bin'

or use os.path.join():

	cl_path = os.path.join(ms_vc_path, 'VC', 'bin')



From strombrg at gmail.com  Thu Mar  4 19:25:30 2010
From: strombrg at gmail.com (Dan Stromberg)
Date: Thu, 4 Mar 2010 16:25:30 -0800 (PST)
Subject: Fast GUI pipemeter: gprog
References: <619ab895-87a9-4b40-b45e-b12299304b38@z1g2000prc.googlegroups.com>
	<1686070.lZ2vcFHjTE@xkzjympik>
Message-ID: <c2936c0c-fb6c-4666-a140-977179692e0a@x1g2000prb.googlegroups.com>

On Mar 4, 1:15?pm, pk <p... at pk.invalid> wrote:
> Dan Stromberg wrote:
> > In case you're interested, I've put a fast GUI pipemeter (measures how
> > fast data is moving through a pipe or redirect and gives two estimates
> > of time-to-completion - one based on the entire transfer so far, and
> > one based on a user-specifiable number of blocks) up at:
>
> >http://stromberg.dnsalias.org/~dstromberg/gprog/
>
> > It uses a dual process design (to make things a bit faster on dual
> > core or better systems) with a cache oblivious algorithm (to self-tune
> > block sizes for good performance) - I've seen it sustain over 2
> > gigabits/second, and that despite Linux' /dev/zero insisting on a tiny
> > blocksize. ?I wasn't able to construct a RAM disk large enough to get
> > anything like a sustained result with larger blocksizes than what
> > Linux' /dev/zero likes - that is, not without springing for a new
> > machine with a huge amount of RAM. ?IOW, your disk or network will
> > very likely be the bottleneck, not the tool.
>
> > I hope it helps someone.
>
> This sounds similar to "pv", although pv does not have a GUI.

Um, yes, pv is similar and has a pretty nice character cell GUI as it
were.  I suppose I'd neglected to mention that I put a list of similar
tools at the beginning of the gprog page, including pv.

Thanks for making sure we were aware of pv.

Interesting that pv seems to be successfully getting 128K blocks out
of /dev/zero.  For some reason, gprog always gets back 16K blocks
from /dev/zero, even when requesting blocks of sizes substantially
larger.  gprog automatically detects this and just starts asking for
16K.

Python folk: Any guesses why a simple file.read(blocksize) would have
such an affinity for returning 16K when redirected from /dev/zero?  If
I run the program against a file on disk, it gets larger blocksizes
fine.






From hwmeder at alumni.unc.edu  Thu Mar  4 19:45:47 2010
From: hwmeder at alumni.unc.edu (Harold Meder)
Date: Thu, 4 Mar 2010 19:45:47 -0500
Subject: Python Opportunity at OPNET
Message-ID: <3a102d3b1003041645o54bb6823k7f3c66ab3c49eaef@mail.gmail.com>

I stumbled across this Job
Posting<https://enterprise1.opnet.com/recruiting/positions/show_job/4836>at
OPNET.
I hope that it is acceptable to post this type of info on this mailing list.
I do not know any further information regarding this opportunity.

   Harold Meder.
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From electriclightheads at gmail.com  Thu Mar  4 19:48:19 2010
From: electriclightheads at gmail.com ('2+)
Date: Fri, 5 Mar 2010 09:48:19 +0900
Subject: pyao makes the right sound but why?
In-Reply-To: <vg3k4tskjw8.fsf@pepper.modeemi.cs.tut.fi>
References: <mailman.192.1267627812.23598.python-list@python.org>
	<vg3k4tskjw8.fsf@pepper.modeemi.cs.tut.fi>
Message-ID: <1078018b1003041648v1060ddd6ibc482b22ab4c0b2d@mail.gmail.com>

omg! u r actually testin my dirty code?!
tnx that's great!
to create an instance
soy.py depends on(needs all of em):

http://sarigama.namaste.jp/oil/tit01.wav
http://sarigama.namaste.jp/oil/tit02.wav
http://sarigama.namaste.jp/oil/tit03.wav
http://sarigama.namaste.jp/oil/tit04.wav
http://sarigama.namaste.jp/oil/tit05.wav
http://sarigama.namaste.jp/oil/tit06.wav
http://sarigama.namaste.jp/oil/tit07.wav

and the easiest way to get the pattern is instance.pattern(howmanyframes)
the object updates itself with .sing()
and can affect each other with .jam_with(other_instance)

this design is to (in the future) create somethang together
with someone who would upload a short.wav on his site (to contrubute
.. or maybe without willin to ;))
have to study urllib(?) for things to come
have to experiment more with picklin aspects too
but this is my attempt to beat the
"listenin to mp3s" culture

btw. where's that help(ao)?

On Fri, Mar 5, 2010 at 3:43 AM, Anssi Saari <as at sci.fi> wrote:
> "'2+" <electriclightheads at gmail.com> writes:
>
>> dev = ao.AudioDevice('alsa')
>> dev.play(x)
>>
>> could launch me a semi realtime dj kinda sys
>> luckily .. it does seem to be making the right sound
>> but why?
>> the default of the samplerate and that 16bit happened to match with my thing x?
>
> Yes, that seems to be the case from help(ao). But I couldn't run
> tofu = soy.Bean() since it seems to want tit01.wav. Do you make that
> available somewhere?
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
SaRiGaMa's Oil Vending Orchestra
is podcasting:
http://sarigama.namaste.jp/podcast/rss.xml


From howe.steven at gmail.com  Thu Mar  4 19:55:24 2010
From: howe.steven at gmail.com (Steven Howe)
Date: Thu, 04 Mar 2010 16:55:24 -0800
Subject: Python Opportunity at OPNET
In-Reply-To: <3a102d3b1003041645o54bb6823k7f3c66ab3c49eaef@mail.gmail.com>
References: <3a102d3b1003041645o54bb6823k7f3c66ab3c49eaef@mail.gmail.com>
Message-ID: <4B90567C.7010305@gmail.com>

On 03/04/2010 04:45 PM, Harold Meder wrote:
> I stumbled across this Job Posting 
> <https://enterprise1.opnet.com/recruiting/positions/show_job/4836> at 
> OPNET.
> I hope that it is acceptable to post this type of info on this mailing 
> list.
> I do not know any further information regarding this opportunity.
>
>    Harold Meder.
Harold,
Thats just a net looking to scoop up people. There's no job there. Just 
a staffing house looking for resumes in expectation for the job market 
to pickup. Staffing houses rip tech people off.

sph




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From electriclightheads at gmail.com  Thu Mar  4 19:58:14 2010
From: electriclightheads at gmail.com ('2+)
Date: Fri, 5 Mar 2010 09:58:14 +0900
Subject: pyao makes the right sound but why?
In-Reply-To: <1078018b1003041648v1060ddd6ibc482b22ab4c0b2d@mail.gmail.com>
References: <mailman.192.1267627812.23598.python-list@python.org>
	<vg3k4tskjw8.fsf@pepper.modeemi.cs.tut.fi>
	<1078018b1003041648v1060ddd6ibc482b22ab4c0b2d@mail.gmail.com>
Message-ID: <1078018b1003041658h786c2b6s29f5588bc65cb944@mail.gmail.com>

o .. but u can use ur own tits.wav
if it is 44100 mono 16bit
and picklin n uploading the tofu
n having lots of those on the net
2 increase vegetrians is what soy.py wanted to mean

On Fri, Mar 5, 2010 at 9:48 AM, '2+ <electriclightheads at gmail.com> wrote:
> omg! u r actually testin my dirty code?!
> tnx that's great!
> to create an instance
> soy.py depends on(needs all of em):
>
> http://sarigama.namaste.jp/oil/tit01.wav
> http://sarigama.namaste.jp/oil/tit02.wav
> http://sarigama.namaste.jp/oil/tit03.wav
> http://sarigama.namaste.jp/oil/tit04.wav
> http://sarigama.namaste.jp/oil/tit05.wav
> http://sarigama.namaste.jp/oil/tit06.wav
> http://sarigama.namaste.jp/oil/tit07.wav
>
> and the easiest way to get the pattern is instance.pattern(howmanyframes)
> the object updates itself with .sing()
> and can affect each other with .jam_with(other_instance)
>
> this design is to (in the future) create somethang together
> with someone who would upload a short.wav on his site (to contrubute
> .. or maybe without willin to ;))
> have to study urllib(?) for things to come
> have to experiment more with picklin aspects too
> but this is my attempt to beat the
> "listenin to mp3s" culture
>
> btw. where's that help(ao)?
>
> On Fri, Mar 5, 2010 at 3:43 AM, Anssi Saari <as at sci.fi> wrote:
>> "'2+" <electriclightheads at gmail.com> writes:
>>
>>> dev = ao.AudioDevice('alsa')
>>> dev.play(x)
>>>
>>> could launch me a semi realtime dj kinda sys
>>> luckily .. it does seem to be making the right sound
>>> but why?
>>> the default of the samplerate and that 16bit happened to match with my thing x?
>>
>> Yes, that seems to be the case from help(ao). But I couldn't run
>> tofu = soy.Bean() since it seems to want tit01.wav. Do you make that
>> available somewhere?
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
>
> --
> SaRiGaMa's Oil Vending Orchestra
> is podcasting:
> http://sarigama.namaste.jp/podcast/rss.xml
>



-- 
SaRiGaMa's Oil Vending Orchestra
is podcasting:
http://sarigama.namaste.jp/podcast/rss.xml


From robert.kern at gmail.com  Thu Mar  4 20:04:30 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 04 Mar 2010 19:04:30 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <cf51c311-7354-4e89-ab2e-45bb8b66d67d@z35g2000yqd.googlegroups.com>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<mailman.209.1267635630.23598.python-list@python.org>
	<cf51c311-7354-4e89-ab2e-45bb8b66d67d@z35g2000yqd.googlegroups.com>
Message-ID: <hmplav$rhe$1@dough.gmane.org>

On 2010-03-04 15:19 PM, Mike Kent wrote:
> On Mar 3, 12:00 pm, Robert Kern<robert.k... at gmail.com>  wrote:
>> On 2010-03-03 09:39 AM, Mike Kent wrote:
>>
>>> What's the compelling use case for this vs. a simple try/finally?
>>
>>>      original_dir = os.getcwd()
>>>      try:
>>>          os.chdir(somewhere)
>>>          # Do other stuff
>>>      finally:
>>>          os.chdir(original_dir)
>>>          # Do other cleanup
>>
>> A custom-written context manager looks nicer and can be more readable.
>>
>> from contextlib import contextmanager
>> import os
>>
>> @contextmanager
>> def pushd(path):
>>       original_dir = os.getcwd()
>>       os.chdir(path)
>>       try:
>>           yield
>>       finally:
>>           os.chdir(original_dir)
>>
>> with pushd(somewhere):
>>       ...
>
> Robert, I like the way you think.  That's a perfect name for that
> context manager!  However, you can clear one thing up for me... isn't
> the inner try/finally superfluous?  My understanding was that there
> was an implicit try/finally already done which will insure that
> everything after the yield statement was always executed.

No, the try: finally: is not implicit. See the source for 
contextlib.GeneratorContextManager. When __exit__() gets an exception from the 
with: block, it will push it into the generator using its .throw() method. This 
raises the exception inside the generator at the yield statement.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From alfps at start.no  Thu Mar  4 20:59:31 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Fri, 05 Mar 2010 02:59:31 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.319.1267753708.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>	<hmokot$uso$1@news.eternal-september.org>	<mailman.293.1267718664.23598.python-list@python.org>	<hmop33$rrj$1@news.eternal-september.org>
	<mailman.319.1267753708.23598.python-list@python.org>
Message-ID: <hmpoi7$gvg$1@news.eternal-september.org>

* Steve Holden:
> Alf P. Steinbach wrote:
>> * Robert Kern:
> [...]
>>> No, it only argues that "with Cleanup():" is supernumerary.
>> I don't know what "supernumerary" means, but to the degree that the
>> argument says anything about a construct that is not 'finally', it says
>> the same about general "with".
>>
> So rather than look up the meaning if a word you aren't familiar with
> you will argue against its use in generic style?

I haven't argued against the use of the word. I haven't done so in generic 
style, and I haven't argued against generic style use of the word, whatever it 
is you're trying to say. And I see that you're out trolling again, Steve Holden, 
implying all sorts of things that are untrue, as is evidently still your style.


>> So whatever you mean by supernumerary, you're saying that the argument
>> implies that "with" is supernumerary.
>>
>> This is starting to look like some earlier discussions in this group,
>> where even basic logic is denied.
>>
> Why not just stick to the facts and forget about the earlier discussions?

For yet another example, here you are implying that I'm not sticking to facts, 
which, again, is untrue, a technique that you should be ashamed of, Steve Holden.

And since you're now injecting some Steve Holden'sk noise into this debate, 
chances are that in your points- and win/lose fixation you think I have scored a 
point immediately upthread, something which you think needs drowning in noise.


Cheers,

- Alf


From breamoreboy at yahoo.co.uk  Thu Mar  4 21:01:37 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Fri, 05 Mar 2010 02:01:37 +0000
Subject: Looking for the mysterious zlib.py* files in Python 2.6.4 (32-bit)
	for Windows
In-Reply-To: <1267744206.18232.1363186281@webmail.messagingengine.com>
References: <1267743672.16774.1363182565@webmail.messagingengine.com>
	<1267744206.18232.1363186281@webmail.messagingengine.com>
Message-ID: <hmpol6$hmh$1@dough.gmane.org>

python at bdurham.com wrote:
> In the process of building an EXE with py2exe, I noticed that
> there's no physical zlib files anywhere on my workstation.
> 
> I can import zlib and use this module's features without problem.
> But when I query zlib.__file__, I get back an empty string.
> 
> Where does the zlib code live? Is zlib a <built-in> in 2.6?
> 
> The reason I question its '<built-in>' status is that when
> analyzing my 2.6 based Py2exe produced executables with
> DependencyWalker, I see references to a zlib.pyd file that
> doesn't exist anywhere on my system. I wonder if this is
> something I should be concerned about?
> 
> Can someone explain this mystery to me?
> 
> Thank you,
> Malcolm

c:\Users\Mark>python
Python 2.6.4 (r264:75708, Oct 26 2009, 08:23:19) [MSC v.1500 32 bit 
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
 >>> import zlib
 >>> help(zlib)
Help on built-in module zlib:

NAME
     zlib

FILE
     (built-in)

[snip the rest of the help output]

IIRC a pyd file is really a DLL, but for a built-in its included into in 
this case python26.dll.

HTH.

Mark Lawrence




From dsblizzard at gmail.com  Thu Mar  4 21:10:59 2010
From: dsblizzard at gmail.com (DSblizzard)
Date: Thu, 4 Mar 2010 18:10:59 -0800 (PST)
Subject: Problem with modules reloading
Message-ID: <1ff10567-1a40-4008-a7f6-035afdf9b727@g10g2000yqh.googlegroups.com>

I have had already following question:
"How to use *.py modules instead of *.pyc?"

Last time I when asked that question I resolved problem by using one
big .py file. And answers doesn't work in my case. Now I ought to use
several files and almost the same problem arises again. Admit I have 2
modules: m2.py and m1.py

in m2.py:
from m1.py import *

def foo2():
  foo1()

foo2()

in m1.py:

# empty

After copying m2.py contents directly to python.exe:
"NameError: global name 'foo1' is not defined"

Then I define foo1 in m1 and copy following lines to python.exe:
from m1.py import *
foo2()

Nothing changes, the same error, and .pyc files, if I have deleted
them doesn't created again.

What is the solution?


From timx at nospam.dev.null  Thu Mar  4 21:20:02 2010
From: timx at nospam.dev.null (Tim X)
Date: Fri, 05 Mar 2010 13:20:02 +1100
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<26bd4a5c-4d66-4597-a0ee-b4990f468e68@g26g2000yqn.googlegroups.com>
	<e0a86785-bb68-4977-8864-010ca4f71a6c@19g2000yqu.googlegroups.com>
Message-ID: <87sk8f1pd9.fsf@lion.rapttech.com.au>

ccc31807 <cartercc at gmail.com> writes:

> On Mar 3, 4:55?pm, toby <t... at telegraphics.com.au> wrote:
>> > ?where you have to store data and
>>
>> "relational data"
>
> Data is neither relational nor unrelational. Data is data.
> Relationships are an artifact, something we impose on the data.
> Relations are for human convenience, not something inherent in the
> data itself.
>
>> > perform a large number of queries.
>>
>> Why does the number matter?
>
> Have you ever had to make a large number of queries to an XML
> database? In some ways, an XML database is the counterpart to a
> relational database in that the data descriptions constitute the
> relations. However, since the search is to the XML elements, and you
> can't construct indicies for XML databases in the same way you can
> with relational databases, a large search can take much longer that
> you might expect.
>

Most XML databases are just a re-vamp of hierarchical databases, which are
one of the two common formats that came before relational databases.
Hierarchical, network and relational databases all have their uses. 

Some 'xml' databases, like existsdb have some pretty powerful indexing
technologies. while they are different to relational db indexing because
they are based around hierarchies rather than relations, they do provide
the ability to do fast queries in the same way that indexes in
relational databases allow fast queries over relations. Both solutions
can do fast queries, they are just optimised for different types of
queries. Likewise, other database technologies that tend to fall into
this category, such as couch and mungo are aimed at applications and
problems that aren't suitable for the relational db model and are better
suited to the types of applications they have been designed for. 

As usual, Xah's rantings are of little substance here. Yes, he is right that
'nosql' is essentially just another buzzword  like 'web 2.0', but so
what? This is an industry that loves its buzzwords.Often its just
marketing hype or some convenience holder for a vague 'concept' some
journalist, consultant or blogger wants to wank on about. 

You cannot hate or love 'nosql' without defining exactly what you mean
by the term. Xah starts by acknowledging the term is ill defined
and then goes on to say how he doesn't like it because it lacks the
mathematical precision of the relational algebra that underpins the
relational model. It seems somewhat ironic to put forward an argument
focusing on the importance of precision when you fail to be precise
regarding the thing your arguing against. 

His point is further weakened by the failure to realise that SQL and the
relational model and relational algebra are different things. Not having
SQL doesn't automatically mean you cannot have a relational model or
operations that are based on relational algebra. SQL is just the
convenient query language and while it has succeeded where other
languages have not, its just one way of interacting with a relational
database. As a language SQL isn't even 'pure' in that it has operations
that don't fit with the relational algebra that he claims is so
important and includes facillities that are really business convenience
operations that actually corrupt the mathematical model and purity that
is the basis of his poorly formed argument. He also overlooks the fact
that none of the successful relational databases have remained true to
either the relational model or the underlying theory. All of the major
RDMS have corrupted things for marketing, performance or maintenance
reasons. Only a very few vendors have stayed true to the relational
model and none of them have achieved much in the way of market share, I
wonder why?

All Xah is doing is being the nets equivalent of radios 'shock jock'. He
searches for some topical issue, identifies a stance that he feels will
elicit the greatest number of emotional responses and lobs it into the
crowd. He rarely hangs around to debate his claims. When he does, he
tends to just yell and shout and more often than not, uses personal
attack to defend his statements rather than arguing the topic. His
analysis is usually shallow and based on popularism If
someone disagrees, they are a moron or a fool and if they agree, they
are a genius just like him. 

Just like true radio shock jocks, some willl love him and some will hate
him. The only things we can be certain about are that reaction is
a much hier motivator for his posts than conviction, there is
probably an inverse relationship  between IQ and support for his
arguments and that his opinion probably has the same longevity as the
term nosql.

Now if we can just get back to debating important topics like why
medical reform is the start of communism, how single mothers are
leeching of tax payers, the positive aspects of slavery, why blacks are
all criminals, how governments are evil, the holocaust conspiricy, why
all muslims are terrorists, the benefits of global warming, the bad
science corrupting our children's innocence and stop wasting time
debating this technology stuff and please people, listen to your harts
and follow your gut - don't let your intellect or so called facts get in
the way, trust your emotions. 

Tim


-- 
tcross (at) rapttech dot com dot au


From python at bdurham.com  Thu Mar  4 21:24:57 2010
From: python at bdurham.com (python at bdurham.com)
Date: Thu, 04 Mar 2010 21:24:57 -0500
Subject: Looking for the mysterious zlib.py* files in Python 2.6.4
	(32-bit) for Windows
In-Reply-To: <hmpol6$hmh$1@dough.gmane.org>
References: <1267743672.16774.1363182565@webmail.messagingengine.com><1267744206.18232.1363186281@webmail.messagingengine.com>
	<hmpol6$hmh$1@dough.gmane.org>
Message-ID: <1267755897.13084.1363210547@webmail.messagingengine.com>

> IIRC a pyd file is really a DLL, but for a built-in its included into in this case python26.dll.

Mystery solved! Thanks Mark!

Regards,
Malcolm


From steve at REMOVE-THIS-cybersource.com.au  Thu Mar  4 21:55:46 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 02:55:46 GMT
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>
	<20100227191040.6c77f2d8@geekmail.INVALID>
	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>
	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>
	<20100301182255.3de59bc6@geekmail.INVALID>
	<mailman.66.1267465347.23598.python-list@python.org>
	<20100301212954.7aa0b99d@geekmail.INVALID>
	<87eik3zmi8.fsf@benfinney.id.au>
	<20100302184056.743a71e7@geekmail.INVALID>
	<mailman.129.1267553139.23598.python-list@python.org>
	<20100302225156.67171851@geekmail.INVALID>
	<877hpuxpdf.fsf@benfinney.id.au> <7v6ae4Ff37U1@mid.individual.net>
	<pan.2010.03.03.05.48.49@REMOVE.THIS.cybersource.com.au>
	<7v9g9qF1nkU1@mid.individual.net>
Message-ID: <4b9072b2$0$27863$c3e8da3@news.astraweb.com>

On Thu, 04 Mar 2010 23:38:31 +1300, Gregory Ewing wrote:

> Steven D'Aprano wrote:
> 
>> True, but one can look at "best practice", or even "standard practice".
>> For Python coders, using docstrings is standard practice if not best
>> practice. Using strings as comments is not.
> 
> In that particular case, yes, it would be possible to objectively
> examine the code and determine whether docstrings were being used as
> opposed to above-the-function comments.
> 
> However, that's only a very small part of what goes to make good code.
> Much more important are questions like: Are the comments meaningful and
> helpful? Is the code reasonably self-explanatory outside of the
> comments? Is it well modularised, and common functionality factored out
> where appropriate? Are couplings between different parts minimised? Does
> it make good use of library code instead of re-inventing things? Is it
> free of obvious security flaws?
> 
> You can't *measure* these things. You can't objectively boil them down
> to a number and say things like "This code is 78.3% good; the customer
> requires it to be at least 75% good, so it meets the requirements in
> that area."
> 
> That's the way in which I believe that software engineering is
> fundamentally different from hardware engineering.


You are conflating two independent questions:

(a) Can we objectively judge the goodness of code, or is it subjective?

(b) Is goodness of code quantitative, or is it qualitative?

You can turn any qualitative measurement into a quantitative measurement 
by turning it into a score from 0 to 10 (say). Instead of "best/good/
average/poor/crap" just rate it from 1 through 5, and now you have a 
measurement that can be averaged and compared with other measurements.

The hard part is turning subjective judgements ("are these comments 
useful, or are they pointless or misleading?") into objective judgements. 
It may be that there is no entirely objective way to measure such things. 
But we can make quasi-objective judgements, by averaging out all the 
individual quirks of subjective judgement:

(1) Take 10 independent judges who are all recognised as good Python 
coders by their peers, and ask them to give a score of 1-5 for the 
quality of the comments, where 1 means "really bad" and 5 means "really 
good". If the average score is 4 or higher, gain a point. If the average 
score is 3 or lower, lose a point.

(2) Take 10 independent judges, as above, and rate the code on how self-
explanatory it is. An average score of 3 or higher gives a point; an 
average of under 2 loses a point.

(Note that I'm more forgiving of non-self-explanatory code than I am of 
bad comments. Better to have no comments than bad ones!)

And so on, through all the various metrics you want to measure.

If the total number of points exceeds some threshold, the software 
passes, otherwise it fails, and you have a nice list of all the weak 
areas that need improvement.

You can do fancy things too, like discard the highest and lowest score 
from the ten judges (to avoid an unusually strict, or unusually slack, 
judge from distorting the scores).

If this all seems too expensive, then you can save money by having fewer 
judges, perhaps even as few as a single code reviewer who is trusted to 
meet whatever standards you are hoping to apply. Or have the judges rate 
randomly selected parts of the code rather than all of it. This will 
severely penalise code that isn't self-explanatory and modular, as the 
judges will not be able to understand it and consequently give it a low 
score.

Of course, there is still a subjective component to this. But it is a 
replicable metric: any group of ten judges should give quite similar 
scores, up to whatever level of confidence you want, and one can perform 
all sorts of objective statistical tests on them to determine whether 
deviations are due by chance or not.

To do all this on the cheap, you could even pass it through something 
like PyLint, which gives you an objective (but not very complete) 
measurement of code quality.

The real problem isn't that defining code quality can't be done, but that 
it can't be done *cheaply*. There are cheap methods, but they aren't very 
good, and good methods, but they're very expensive.


-- 
Steven


From weasle182222 at googlemail.com  Thu Mar  4 22:09:57 2010
From: weasle182222 at googlemail.com (lucky-villa)
Date: Thu, 4 Mar 2010 19:09:57 -0800 (PST)
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Message-ID: <a8ec1df1-01b9-4b55-8a7f-5faf36e1b26a@k17g2000yqb.googlegroups.com>

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From rami.chowdhury at gmail.com  Thu Mar  4 22:11:39 2010
From: rami.chowdhury at gmail.com (Rami Chowdhury)
Date: Thu, 4 Mar 2010 19:11:39 -0800
Subject: Problem with modules reloading
In-Reply-To: <1ff10567-1a40-4008-a7f6-035afdf9b727@g10g2000yqh.googlegroups.com>
References: <1ff10567-1a40-4008-a7f6-035afdf9b727@g10g2000yqh.googlegroups.com>
Message-ID: <E3006C2D-BB00-4C6B-B70C-677EA35ED1B2@gmail.com>


On Mar 4, 2010, at 18:10 , DSblizzard wrote:

> I have had already following question:
> "How to use *.py modules instead of *.pyc?"
> 
> Last time I when asked that question I resolved problem by using one
> big .py file. And answers doesn't work in my case. Now I ought to use
> several files and almost the same problem arises again. Admit I have 2
> modules: m2.py and m1.py
> 
> in m2.py:
> from m1.py import *
> 
> def foo2():
>  foo1()
> 
> foo2()
> 
> in m1.py:
> 
> # empty
> 
> After copying m2.py contents directly to python.exe:
> "NameError: global name 'foo1' is not defined"
> 
> Then I define foo1 in m1 and copy following lines to python.exe:
> from m1.py import *
> foo2()
> 

When you execute the import statement again, Python checks to see which module you are importing from, sees that you have already imported that module, and doesn't reload it. So nothing changes. If you need to reload m1, then use the reload() function:

reload(m1)

It's generally a good idea to avoid statements like "from m1 import *", to avoid confusion and keep your namespaces separate. So if you had defined m2.py like this...

import m1
def foo2():
  m1.foo1()

...then "reload(m1)" would solve your problem straight away.

> Nothing changes, the same error, and .pyc files, if I have deleted
> them doesn't created again.
> 
> What is the solution?
> -- 
> http://mail.python.org/mailman/listinfo/python-list



From hawccer at gmail.com  Thu Mar  4 22:30:17 2010
From: hawccer at gmail.com (Adhitya Jiwa Pratama)
Date: Fri, 5 Mar 2010 10:30:17 +0700
Subject: No subject
Message-ID: <a7daa8dc1003041930v519cc663u1f51b0f534a59a16@mail.gmail.com>




From steve at REMOVE-THIS-cybersource.com.au  Thu Mar  4 22:32:46 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 03:32:46 GMT
Subject: Generic singleton
References: <mailman.222.1267642515.23598.python-list@python.org>
	<pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>
	<Xns9D317DB33C63Aduncanbooth@127.0.0.1>
Message-ID: <4b907b5e$0$27863$c3e8da3@news.astraweb.com>

On Thu, 04 Mar 2010 12:21:26 +0000, Duncan Booth wrote:

> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:
> 
>> On Wed, 03 Mar 2010 19:54:52 +0100, mk wrote:
>> 
>>> Hello,
>>> 
>>> So I set out to write generic singleton, i.e. the one that would do a
>>> singleton with attributes of specified class. At first:
>> 
>> Groan. What is it with the Singleton design pattern? It is one of the
>> least useful design patterns, and yet it's *everywhere* in Java and C++
>> world.
> 
> It is also *everywhere* in the Python world. Unlike Java and C++, Python
> even has its own built-in type for singletons.
> 
> If you want a singleton in Python use a module.

I was wondering who would be the first to point that out :)

You are, of course, correct that the preferred way to solve the Singleton 
problem is with a module. (The other preferred way is with the Borg 
pattern, which is kind of a reverse-Singleton.) Using classes works too: 
so long as you do not instantiate it, but use it as an object in its own 
right, a class is also a singleton.

However, I don't think it's quite right to say that modules *are* 
Singletons, although I accept that this is now getting into a tedious 
argument about terminology. A singleton is an instance of a class which 
can only have a single instance. This is not true of modules:

>>> import string, math
>>> type(string) is type(math)
True
>>> string is math
False

Wikipedia points out that the Singleton pattern is normally understood to 
exclude static structures which merely happen to be created once:

"Note the distinction between a simple static instance of a class and a 
singleton..."

http://en.wikipedia.org/wiki/Singleton_pattern

Each individual module is a static instance of the module class which 
merely happens to be instantiated once. (You can subvert Python's import 
machinery to create multiple copies of a module, but normally this 
doesn't happen.) So *technically* modules are not singletons, although 
they behave just like them and give all the benefits, and disadvantages, 
of such. And as you say, the preferred Pythonic solution to the 
requirement for a Singleton is usually a module.

Python does have it's own singletons, like None, True and False. For some 
reason, they behave quite differently: NoneType fails if you try to 
instantiate it again, while bool returns the appropriate existing 
singleton:

>>> NoneType = type(None)
>>> NoneType()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: cannot create 'NoneType' instances
>>> bool(45)
True


I wonder why NoneType doesn't just return None?


-- 
Steven


From robert.kern at gmail.com  Thu Mar  4 22:35:13 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 04 Mar 2010 21:35:13 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <6af3c613-3439-484b-83f1-49213f1ed574@k17g2000yqb.googlegroups.com>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>
	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>
	<hmokot$uso$1@news.eternal-september.org>	<mailman.293.1267718664.23598.python-list@python.org>
	<hmop33$rrj$1@news.eternal-september.org>	<mailman.303.1267723835.23598.python-list@python.org>
	<6af3c613-3439-484b-83f1-49213f1ed574@k17g2000yqb.googlegroups.com>
Message-ID: <hmpu64$us8$1@dough.gmane.org>

On 2010-03-04 15:12 , Mike Kent wrote:
> On Mar 4, 12:30 pm, Robert Kern<robert.k... at gmail.com>  wrote:
>
>> He's ignorant of the use cases of the with: statement, true.
>
> <humor>  Ouch!  Ignorant of the use cases of the with statement, am I?
> Odd, I use it all the time.</humor>

No, I was referring to Jean-Michel, who was not familiar with the with: statement.

>> Given only your
>> example of the with: statement, it is hard to fault him for thinking that try:
>> finally: wouldn't suffice.
>
> <humor>  Damn me with faint praise, will you?</humor>

Also talking about Jean-Michel. :-)

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From robert.kern at gmail.com  Thu Mar  4 22:42:32 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 04 Mar 2010 21:42:32 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <hmpc3r$2il$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>	<hmokot$uso$1@news.eternal-september.org>	<mailman.293.1267718664.23598.python-list@python.org>	<hmop33$rrj$1@news.eternal-september.org>	<mailman.303.1267723835.23598.python-list@python.org>	<6af3c613-3439-484b-83f1-49213f1ed574@k17g2000yqb.googlegroups.com>
	<hmpc3r$2il$1@news.eternal-september.org>
Message-ID: <hmpujr$vhg$1@dough.gmane.org>

On 2010-03-04 16:27 , Alf P. Steinbach wrote:
> * Mike Kent:

>> However, I fail to understand his response that I must have meant try/
>> else instead, as this, as Mr. Kern pointed out, is invalid syntax.
>> Perhaps Mr. Steinbach would like to give an example?
>
> OK.
>
> Assuming that you wanted the chdir to be within a try block (which it
> was in your code), then to get code equivalent to my code, for the
> purpose of a comparision of codes that do the same, you'd have to write
> something like ...
>
> original_dir = os.getcwd()
> try:
> os.chdir(somewhere)
> except Whatever:
> # E.g. log it.
> raise
> else:
> try:
> # Do other stuff
> finally:
> os.chdir(original_dir)
> # Do other cleanup
>
> ... which would be a more general case.
>
> I've also given this example in response to Robert earlier in the
> thread. Although I haven't tried it I believe it's syntactically valid.
> If not, then the relevant typo should just be fixed. :-)
>
> I have no idea which construct Robert thought was syntactically invalid.
> I think that if he's written that, then it must have been something he
> thought of.

I was just trying to interpret what you meant by "Changing 'finally' to 'else' 
could make it equivalent." As far as I can tell, that has only one possible 
interpretation going by the plain meaning of the words, and it isn't yours. 
Since you always seem to refer to "try/else" as if it were an independent 
construct and not part of "try: except: else:" and no one else introduced 
except: clause, I must reiterate that your communications have been fabulously 
misleading.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From timr at probo.com  Thu Mar  4 22:44:34 2010
From: timr at probo.com (Tim Roberts)
Date: Thu, 04 Mar 2010 19:44:34 -0800
Subject: python 2.6: how to modify a PIL image from C without copying
	forth and back
References: <4b8daf7d$0$2868$426a74cc@news.free.fr>
	<8m0so5d5lmgg3dombnssflnt1jh6h0ka3v@4ax.com>
	<4b8e2129$0$8262$426a34cc@news.free.fr>
Message-ID: <iev0p5h72gum049d04fpa4hc4s08ksl7bs@4ax.com>

News123 <news123 at free.fr> wrote:
>
>Yes, this might be an option
>Somehow though it didn't feel right for me to depend on internal non
>documented data types, which might change between releases of PIL.

That's absolutely true.  If performance is a priority, somethimes you have
to do things that are "dirty".  Just include lots of comments saying what
you did and why.

Personally, because so much of PIL is in C, I would judge internal changes
to be unlikely.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From steve at REMOVE-THIS-cybersource.com.au  Thu Mar  4 23:01:21 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 04:01:21 GMT
Subject: Problem with modules reloading
References: <1ff10567-1a40-4008-a7f6-035afdf9b727@g10g2000yqh.googlegroups.com>
Message-ID: <4b908210$0$27863$c3e8da3@news.astraweb.com>

On Thu, 04 Mar 2010 18:10:59 -0800, DSblizzard wrote:

> I have had already following question: "How to use *.py modules instead
> of *.pyc?"
> 
> Last time I when asked that question I resolved problem by using one big
> .py file. 

I think you are confused.

.pyc files are Python compiled byte-code files. You don't use them, 
Python does. When you import a module, Python *automatically* compiles it 
and creates a .pyc file, which is then used to speed up loading next time 
you run Python and import the same module.

If you delete the .pyc file, it is quietly recreated next time you import 
the module again.

Using "one big .py file" or not, this has nothing to do with whether 
Python loads the module from source-code or byte-code. Just ignore 
the .pyc files.




> And answers doesn't work in my case. Now I ought to use
> several files and almost the same problem arises again. Admit I have 2
> modules: m2.py and m1.py
> 
> in m2.py:
> from m1.py import *

That won't work, because Python looks for a package called "m1" which 
contains a module called "py". The only way that line can succeed is if 
you have a directory called "m1" containing two files called 
"__init__.py" and "py.py", like this:

m1/
m1/__init__.py
m1/py.py


Python will then load __init__.py, then load py.py. Since I'm pretty sure 
you don't have that directory, the above line cannot possible work.




> What is the solution?

Don't use "from module import *", it is confusing and doesn't work with 
reload(module) at all.

You shouldn't use reload(module) except for experimentation in the 
interactive interpreter.

You should work through the part of the tutorial that talks about modules 
and imports.

http://docs.python.org/tutorial/
http://docs.python.org/tutorial/modules.html


Good luck!


-- 
Steven



From robert.kern at gmail.com  Thu Mar  4 23:01:44 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 04 Mar 2010 22:01:44 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <hmph3b$20o$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>	<hmn03d$5r6$1@news.eternal-september.org>	<mailman.292.1267717742.23598.python-list@python.org>	<hmooo6$pg0$1@news.eternal-september.org>	<mailman.300.1267723245.23598.python-list@python.org>	<hmoul7$2i9$1@news.eternal-september.org>	<mailman.314.1267744631.23598.python-list@python.org>
	<hmph3b$20o$1@news.eternal-september.org>
Message-ID: <hmpvnr$1uf$1@dough.gmane.org>

On 2010-03-04 17:52 , Alf P. Steinbach wrote:
> * Robert Kern:
>> On 2010-03-04 12:37 PM, Alf P. Steinbach wrote:
>>> * Robert Kern:
>>>> On 2010-03-04 10:56 AM, Alf P. Steinbach wrote:
>>>>> * Robert Kern:
>>>>>> On 2010-03-03 18:49 PM, Alf P. Steinbach wrote:
>>> [snippety]
>>>>>>
>>>>>>> If you call the possibly failing operation "A", then that systematic
>>>>>>> approach goes like this: if A fails, then it has cleaned up its own
>>>>>>> mess, but if A succeeds, then it's the responsibility of the calling
>>>>>>> code to clean up if the higher level (multiple statements) operation
>>>>>>> that A is embedded in, fails.
>>>>>>>
>>>>>>> And that's what Marginean's original C++ ScopeGuard was designed
>>>>>>> for,
>>>>>>> and what the corresponding Python Cleanup class is designed for.
>>>>>>
>>>>>> And try: finally:, for that matter.
>>>>>
>>>>> Not to mention "with".
>>>>>
>>>>> Some other poster made the same error recently in this thread; it is a
>>>>> common fallacy in discussions about programming, to assume that since
>>>>> the same can be expressed using lower level constructs, those are all
>>>>> that are required.
>>>>>
>>>>> If adopted as true it ultimately means the removal of all control
>>>>> structures above the level of "if" and "goto" (except Python doesn't
>>>>> have "goto").
>>>>
>>>> What I'm trying to explain is that the with: statement has a use even
>>>> if Cleanup doesn't. Arguing that Cleanup doesn't improve on try:
>>>> finally: does not mean that the with: statement doesn't improve on
>>>> try: finally:.
>>>
>>> That's a different argument, essentially that you see no advantage for
>>> your current coding patterns.
>>>
>>> It's unconnected to the argument I responded to.
>>>
>>> The argument that I responded to, that the possibility of expressing
>>> things at the level of try:finally: means that a higher level construct
>>> is superfluous, is still meaningless.
>>
>> I am attacking your premise that the "with Cleanup():" construct is
>> higher level than try: finally:. It isn't. It provides the same level
>> of abstraction as try: finally:.
>>
>> This is distinct from the accepted uses of the with: statement which
>> *are* higher level than try: finally: and which do confer practical
>> benefits over using try: finally: despite being syntactical sugar for
>> try: finally:.
>>
>>>>>>>> Both formulations can be correct (and both work perfectly fine with
>>>>>>>> the chdir() example being used). Sometimes one is better than the
>>>>>>>> other, and sometimes not. You can achieve both ways with either
>>>>>>>> your
>>>>>>>> Cleanup class or with try: finally:.
>>>>>>>>
>>>>>>>> I am still of the opinion that Cleanup is not an improvement over
>>>>>>>> try:
>>>>>>>> finally: and has the significant ugliness of forcing cleanup code
>>>>>>>> into
>>>>>>>> callables. This significantly limits what you can do in your
>>>>>>>> cleanup
>>>>>>>> code.
>>>>>>>
>>>>>>> Uhm, not really. :-) As I see it.
>>>>>>
>>>>>> Well, not being able to affect the namespace is a significant
>>>>>> limitation. Sometimes you need to delete objects from the
>>>>>> namespace in
>>>>>> order to ensure that their refcounts go to zero and their cleanup
>>>>>> code
>>>>>> gets executed.
>>>>>
>>>>> Just a nit (I agree that a lambda can't do this, but as to what's
>>>>> required): assigning None is sufficient for that[1].
>>>>
>>>> Yes, but no callable is going to allow you to assign None to names in
>>>> that namespace, either. Not without sys._getframe() hackery, in any
>>>> case.
>>>>
>>>>> However, note that the current language doesn't guarantee such
>>>>> cleanup,
>>>>> at least as far as I know.
>>>>>
>>>>> So while it's good practice to support it, to do everything to let it
>>>>> happen, it's presumably bad practice to rely on it happening.
>>>>>
>>>>>
>>>>>> Tracebacks will keep the namespace alive and all objects in it.
>>>>>
>>>>> Thanks!, I hadn't thought of connecting that to general cleanup
>>>>> actions.
>>>>>
>>>>> It limits the use of general "with" in the same way.
>>>>
>>>> Not really.
>>>
>>> Sorry, it limits general 'with' in /exactly/ the same way.
>>>
>>>> It's easy to write context managers that do that [delete objects from
>>>> the namespace].
>>>
>>> Sorry, no can do, as far as I know; your following example quoted below
>>> is an example of /something else/.
>>
>> Okay, so what do you mean by 'the use of general "with"'? I'm talking
>> about writing a context manager or using the @contextmanager decorator
>> to do some initialization and then later cleaning up that
>> initialization. That cleaning up may entail deleting an object. You
>> are correct that the context manager can't affect the namespace of the
>> with: clause, but that's not the initialization that it would need to
>> clean up.
>>
>> Yes, you can write code with a with: statement where you try to clean
>> up stuff that happened inside of the clause (you did), but that's not
>> how the with: statement was ever intended to be used nor is it good
>> practice to do so because of that limitation. Context managers are
>> designed to initialize specific things, then clean them up. I thought
>> you were talking about the uses of the with: statement as described in
>> PEP-343, not every possible misuse of the with: statement.
>
> I'm not the one talking about removing variables or that "it's easy to
> write context managers that do that".
>
> You are the one talking about that.
>
> So I have really not much to add.
>
> It seems that you're now agreeing with me that former is not good
> practice and that the latter is impossible to do portably, but you now
> argue against your earlier stand as if that was something that I had put
> forward.

No, I'm still saying that sometimes you do need to remove variables that you 
initialized in the initialization section. Writing a purpose-built context 
manager which encapsulates the initialization and finalization allows you to do 
this easily. Putting the initialization section inside the with: clause, as you 
do, and requiring cleanup code to be put into callables makes this hard.

> It's a bit confusing when you argue against your own statements.
>
>>> And adding on top of irrelevancy, for the pure technical aspect it can
>>> be accomplished in the same way using Cleanup (I provide an example
>>> below).
>>>
>>> However, doing that would generally be worse than pointless since with
>>> good coding practices the objects would become unreferenced anyway.
>>>
>>>
>>>> You put the initialization code in the __enter__() method, assign
>>>> whatever objects you want to keep around through the with: clause as
>>>> attributes on the manager, then delete those attributes in the
>>>> __exit__().
>>>
>>> Analogously, if one were to do this thing, then it could be accomplished
>>> using a Cleanup context manager as follows:
>>>
>>> foo = lambda: None
>>> foo.x = create_some_object()
>>> at_cleanup.call( lambda o = foo: delattr( o, "x" ) )
>>>
>>> ... except that
>>>
>>> 1) for a once-only case this is less code :-)
>>
>> Not compared to a try: finally:, it isn't.
>
> Again, this context shifting is bewildering. As you can see, quoted
> above, you were talking about a situation where you would have defined a
> context manager, presumably because a 'try' would not in your opinion be
> simpler for whatever it was that you had in mind. But you are responding
> to the code I offered as if it was an alternative to something where you
> would find a 'try' to be simplest.

I have consistently put forward that for once-only cases, try: finally: is a 
preferable construct to "with Cleanup():". I also put forward that for 
repetitive cases, a purpose-built context manager is preferable. I note that for 
both try: finally: and a purpose-built context manager, modifying the namespace 
is easy to do while it is difficult and less readable to do with "with 
Cleanup():". Since you were claiming that the "generic with:" would have the 
same problem as "with Cleanup():" I was trying to explain for why all of the 
intended use cases of the with: statement (the purpose-built context managers), 
there is no problem. Capisce?

>>> 2) it is a usage that I wouldn't recommend; instead I recommend adopting
>>> good
>>> coding practices where object references aren't kept around.
>>
>> Many of the use cases of the with: statement involve creating an
>> object (like a lock or a transaction object), keeping it around for
>> the duration of the "# Do stuff" block, and then finalizing it.
>>
>>>> Or, you use the @contextmanager decorator to turn a generator into a
>>>> context manager, and you just assign to local variables and del them
>>>> in the finally: clause.
>>>
>>> Uhm, you don't need a 'finally' clause when you define a context
>>> manager.
>>
>> When you use the @contextmanager decorator, you almost always do. See
>> the Examples section of PEP 343:
>>
>> http://www.python.org/dev/peps/pep-0343/
>>
>>> Additionally, you don't need to 'del' the local variables in
>>> @contextmanager decorated generator.
>>>
>>> The local variables cease to exist automatically.
>>
>> True.
>>
>>>> What you can't do is write a generic context manager where the
>>>> initialization happens inside the with: clause and the cleanup actions
>>>> are registered callables. That does not allow you to affect the
>>>> namespace.
>>>
>>> If you mean that you can't introduce direct local variables and have
>>> them deleted by "registered callables" in a portable way, then right.
>>>
>>> But I can't think of any example where that would be relevant; in
>>> particular what matters for supporting on-destruction cleanup is whether
>>> you keep any references or not, not whether you have a local variable of
>>> any given name.
>>
>> Well, local variables keep references to objects. Variable assignment
>> followed by deletion is a very readable way to keep an object around
>> for a while then remove it later. If you have to go through less
>> readable contortions to keep the object around when it needs to be and
>> clean it up later, then that is a mark against your approach.
>
> Sorry, as with the places noted above, I can't understand what you're
> trying to say here. I don't recommend coding practices where you keep
> object references around,

Then how do you clean up locks and transaction objects and similar things if you 
don't keep them around during the code suite? Creating an object, keeping it 
around while executing a specific chunk of code, and finalizing it safely is a 
prime use case for these kinds of constructs.

> and you have twice quoted that above. I don't
> have any clue what "contortions" you are talking about, it must be
> something that you imagine.

These are the contortions:

   foo = lambda: None
   foo.x = create_some_object()
   at_cleanup.call( lambda o = foo: delattr( o, "x" ) )

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From chris.lieb at gmail.com  Thu Mar  4 23:07:12 2010
From: chris.lieb at gmail.com (Chris Lieb)
Date: Thu, 4 Mar 2010 20:07:12 -0800 (PST)
Subject: Failure in test_hashlib.py and test_hmac.py
References: <175865db-f64a-4633-8e36-ab4a5a5eaccf@x22g2000yqx.googlegroups.com>
Message-ID: <545b8abb-72a3-4527-b290-d937cfce5470@t23g2000yqt.googlegroups.com>

On Mar 3, 8:33?pm, Chris Lieb <chris.l... at gmail.com> wrote:
> I am building Python 2.6.4 on a shared server and am encountering test
> failures in test_hashlib.py and test_hmac.py, specifically concerning
> sha512. ?I recompiled Python with --with-pydebug and CLFAGS=CPPFLAGS="-
> g" and ran the tests in GDB and got the following results:
>
> ----------------------------------------------------------------------------
>
> GNU gdb 6.6.50.20070726-cvs
> Copyright (C) 2007 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and
> you are
> welcome to change it and/or distribute copies of it under certain
> conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB. ?Type "show warranty" for
> details.
> This GDB was configured as "x86_64-suse-linux"...
> Using host libthread_db library "/lib64/libthread_db.so.1".
> (gdb) run test_hashlib.py
> Starting program: /export/users1/chris.lieb/packages/python/bin/
> python2.6 test_hashlib.py
> test_case_md5_0 (__main__.HashLibTestCase) ... ok
> test_case_md5_1 (__main__.HashLibTestCase) ... ok
> test_case_md5_2 (__main__.HashLibTestCase) ... ok
> test_case_md5_huge (__main__.HashLibTestCase) ... ok
> test_case_md5_uintmax (__main__.HashLibTestCase) ... ok
> test_case_sha1_0 (__main__.HashLibTestCase) ... ok
> test_case_sha1_1 (__main__.HashLibTestCase) ... ok
> test_case_sha1_2 (__main__.HashLibTestCase) ... ok
> test_case_sha1_3 (__main__.HashLibTestCase) ... ok
> test_case_sha224_0 (__main__.HashLibTestCase) ... ok
> test_case_sha224_1 (__main__.HashLibTestCase) ... ok
> test_case_sha224_2 (__main__.HashLibTestCase) ... ok
> test_case_sha224_3 (__main__.HashLibTestCase) ... ok
> test_case_sha256_0 (__main__.HashLibTestCase) ... ok
> test_case_sha256_1 (__main__.HashLibTestCase) ... ok
> test_case_sha256_2 (__main__.HashLibTestCase) ... ok
> test_case_sha256_3 (__main__.HashLibTestCase) ... ok
> test_case_sha384_0 (__main__.HashLibTestCase) ... ok
> test_case_sha384_1 (__main__.HashLibTestCase) ... ok
> test_case_sha384_2 (__main__.HashLibTestCase) ... ok
> test_case_sha384_3 (__main__.HashLibTestCase) ... ok
> test_case_sha512_0 (__main__.HashLibTestCase) ... FAIL
> test_case_sha512_1 (__main__.HashLibTestCase) ... FAIL
> test_case_sha512_2 (__main__.HashLibTestCase) ... FAIL
> test_case_sha512_3 (__main__.HashLibTestCase) ... FAIL
> test_hexdigest (__main__.HashLibTestCase) ...
> Program received signal SIGSEGV, Segmentation fault.
> Cannot remove breakpoints because program is no longer writable.
> It might be running in another process.
> Further execution is probably impossible.
> 0x00002ba86ffbb463 in ?? ()
> (gdb) bt
> #0 ?0x00002ba86ffbb463 in ?? ()
> #1 ?0x000000000046993d in PyString_FromStringAndSize (
> ? ? str=0x7fff71c67800 " \203 5~? T(P m\200\a \005\vW
> \025 \203 ! l G <]
> \205 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?5
> \203\030 \207~ /c 1 GAz\201 82z ' > x q \177",
> size=1054484473)
> ? ? at Objects/stringobject.c:90
> #2 ?0x00002ba87030d59a in ?? ()
> #3 ?0x0000000000000000 in ?? ()
>
> -----------------------------------------------------------------------------------------
>
> GNU gdb 6.6.50.20070726-cvs
> Copyright (C) 2007 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and
> you are
> welcome to change it and/or distribute copies of it under certain
> conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB. ?Type "show warranty" for
> details.
> This GDB was configured as "x86_64-suse-linux"...
> Using host libthread_db library "/lib64/libthread_db.so.1".
> (gdb) run test_hmac.py
> Starting program: /export/users1/chris.lieb/packages/python/bin/
> python2.6 test_hmac.py
> test_legacy_block_size_warnings (__main__.TestVectorsTestCase) ... ok
> test_md5_vectors (__main__.TestVectorsTestCase) ... ok
> test_sha224_rfc4231 (__main__.TestVectorsTestCase) ... ok
> test_sha256_rfc4231 (__main__.TestVectorsTestCase) ... ok
> test_sha384_rfc4231 (__main__.TestVectorsTestCase) ... ok
> test_sha512_rfc4231 (__main__.TestVectorsTestCase) ...
> Program received signal SIGSEGV, Segmentation fault.
> Cannot remove breakpoints because program is no longer writable.
> It might be running in another process.
> Further execution is probably impossible.
> 0x00002b483844e4c7 in ?? ()
> (gdb) bt
> #0 ?0x00002b483844e4c7 in ?? ()
> #1 ?0x000000000046993d in PyString_FromStringAndSize (
> ? ? str=0x7ffff84f6730 "\026C3D \235D\t \025 [ G
> \032bG? ~ \235\t\233aP",
> ? ? size=4108309188) at Objects/stringobject.c:90
> #2 ?0x00002b48387e159a in ?? ()
> #3 ?0x0000000000000000 in ?? ()
>
> --------------------------------------------------------------------
>
> In the case of test_hashlib.py, it segfaulted on the first sha512 test
> when I didn't have the debugging options enabled. ?Only after enabling
> debugging did I get FAIL's for the sha512 tests.
>
> Does anyone know what is causing these failures?

Does anyone have any tips or insights for trying to debug this issue?
Any help is greatly appreciated.

--
Chris Lieb


From showell30 at yahoo.com  Thu Mar  4 23:14:42 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Thu, 4 Mar 2010 20:14:42 -0800 (PST)
Subject: Generic singleton
References: <mailman.222.1267642515.23598.python-list@python.org> 
	<pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>
	<Xns9D317DB33C63Aduncanbooth@127.0.0.1> 
	<4b907b5e$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <866ef5a6-119d-4962-bf99-57915d3a59d5@g28g2000prb.googlegroups.com>

On Mar 4, 7:32?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
>
> Python does have it's own singletons, like None, True and False. For some
> reason, they behave quite differently: NoneType fails if you try to
> instantiate it again, while bool returns the appropriate existing
> singleton:
>
> >>> NoneType = type(None)
> >>> NoneType()
>
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in <module>
> TypeError: cannot create 'NoneType' instances>>> bool(45)
>
> True
>
> I wonder why NoneType doesn't just return None?
>

It's an interesting question.  Just to elaborate on your example:

    >>> type(None)()
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    TypeError: cannot create 'NoneType' instances
    >>> type(True)(False)
    False
    >>> type(False)(True)
    True

I suspect that the answer is just that None is special.  There is
probably just no compelling use case where you want to clone None in a
one-liner.

To make None work like True/False in certain use cases you'd want
something like this:

    def clone(val):
        if val is None:
            return None
        else:
            return type(val)(val)

The same method would work against some non-singletons as well,
although I'm not sure what the desired semantics would actually be:

    for value in [None, False, True, 42, [1, 2, 3]]:
        print clone(value)



From showell30 at yahoo.com  Thu Mar  4 23:37:50 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Thu, 4 Mar 2010 20:37:50 -0800 (PST)
Subject: A "scopeguard" for Python
References: <hmlu55$n1s$1@news.eternal-september.org>
Message-ID: <dc2f6b66-73af-4510-845c-b2d014c83520@b7g2000pro.googlegroups.com>

On Mar 3, 7:10?am, "Alf P. Steinbach" <al... at start.no> wrote:
> For C++ Petru Marginean once invented the "scope guard" technique (elaborated on
> by Andrei Alexandrescu, they published an article about it in DDJ) where all you
> need to do to ensure some desired cleanup at the end of a scope, even when the
> scope is exited via an exception, is to declare a ScopeGuard w/desired action.
>
> The C++ ScopeGuard was/is for those situations where you don't have proper
> classes with automatic cleanup, which happily is seldom the case in good C++
> code, but languages like Java and Python don't support automatic cleanup and so
> the use case for something like ScopeGuard is ever present.
>
> For use with a 'with' statement and possibly suitable 'lambda' arguments:
>
> <code>
> class Cleanup:
> ? ? ?def __init__( self ):
> ? ? ? ? ?self._actions = []
>
> ? ? ?def call( self, action ):
> ? ? ? ? ?assert( is_callable( action ) )
> ? ? ? ? ?self._actions.append( action )
>
> ? ? ?def __enter__( self ):
> ? ? ? ? ?return self
>
> ? ? ?def __exit__( self, x_type, x_value, x_traceback ):
> ? ? ? ? ?while( len( self._actions ) != 0 ):
> ? ? ? ? ? ? ?try:
> ? ? ? ? ? ? ? ? ?self._actions.pop()()
> ? ? ? ? ? ? ?except BaseException as x:
> ? ? ? ? ? ? ? ? ?raise AssertionError( "Cleanup: exception during cleanup" ) from
> </code>
>
> I guess the typical usage would be what I used it for, a case where the cleanup
> action (namely, changing back to an original directory) apparently didn't fit
> the standard library's support for 'with', like
>
> ? ?with Cleanup as at_cleanup:
> ? ? ? ?# blah blah
> ? ? ? ?chdir( somewhere )
> ? ? ? ?at_cleanup.call( lambda: chdir( original_dir ) )
> ? ? ? ?# blah blah
>
> Another use case might be where one otherwise would get into very deep nesting
> of 'with' statements with every nested 'with' at the end, like a degenerate tree
> that for all purposes is a list. Then the above, or some variant, can help to
> /flatten/ the structure. To get rid of that silly & annoying nesting. :-)
>
> Cheers,
>
> - Alf (just sharing, it's not seriously tested code)

Hi Alf, I think I understand the notion you're going after here.  You
have multiple cleanup steps that you want to defer till the end, and
there is some possibility that things will go wrong along the way, but
you want to clean up as much as you can.  And, of course, flatter is
better.

Is this sort of what you are striving for?

    class Cleanup:
         def __init__( self ):
             self._actions = []

         def call( self, action ):
             self._actions.append( action )

         def __enter__( self ):
             return self

         def __exit__( self, x_type, x_value, x_traceback ):
             while( len( self._actions ) != 0 ):
                 try:
                     self._actions.pop()()
                 except BaseException as x:
                     raise AssertionError( "Cleanup: exception during
cleanup" )

    def clean_the_floor():
        print('clean the floor')

    def carouse(num_bottles, accident):
        with Cleanup() as at_cleanup:
            at_cleanup.call(clean_the_floor)
            for i in range(num_bottles):
                def take_down(i=i):
                    print('take one down', i)
                at_cleanup.call(take_down)
                if i == accident:
                    raise Exception('oops!')
                print ('put bottle on wall', i)

    carouse(10, None)
    carouse(5, 3)


From showell30 at yahoo.com  Fri Mar  5 00:12:17 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Thu, 4 Mar 2010 21:12:17 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org> 
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com> 
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
	<mailman.199.1267631220.23598.python-list@python.org> 
	<7xlje8lb9o.fsf@ruckus.brouhaha.com>
Message-ID: <e6f5c938-dfac-4c0c-8b4b-cbda2a670dcf@x1g2000prb.googlegroups.com>

On Mar 4, 12:52?am, Paul Rubin <no.em... at nospam.invalid> wrote:
> mk <mrk... at gmail.com> writes:
> > OK, but how? How would you make up e.g. for JSON's lack of comments?
>
> Modify the JSON standard so that "JSON 2.0" allows comments.

If you don't control the JSON standard, providing a compelling
alternative to JSON might be the best way to force JSON to accomodate
a wider audience.  It might just be that the people behind JSON
deliberately avoid comments, because it's not in the scope of the
problem they are trying to solve.  Hence another need for
alternatives.


> > OTOH, if YAML produces net benefit for as few as, say, 200 people in
> > real world, the effort to make it has been well worth it.
>
> Not if 200,000 other people have to deal with it but don't receive the
> benefit.
>

How many hundreds of thousands of people have had to deal with XML
without receiving its benefits?  Do well-established standards get an
exemption from the rule that software is not allowed to annoy non-
willing users of it?







From ken at seehart.com  Fri Mar  5 00:33:26 2010
From: ken at seehart.com (Ken Seehart)
Date: Thu, 04 Mar 2010 21:33:26 -0800
Subject: IMAP mail filters tool
Message-ID: <4B9097A6.2050600@seehart.com>

I'm thinking of possibly making a simple client-agnostic tool for 
filtering and processing IMAP email.  I'm a Thunderbird user, but I'm 
interested in a tool that is not client software specific.

So I am is checking for prior art.  Does anyone know of a filter tool 
with most of these features?

    * Written and customizable with python
    * IMAP based
    * Runs on client (i.e. without installing anything on the server)
    * Runs completely independent of client software (though could be
      launched from any email client that can support it)
    * Automatically suggests new rules based on manual movement of
      emails into folders (based on comparison of all header data across
      all existing folders)
    * Take arbitrary actions in response to rules (e.g. universally
      denying access to spam senders to all online cheese shops)
    * Capable of serving as a prototyping framework for things like spam
      filtering
    * General filtering functionality, not particularly focused on spam
    * Posts and updates rules to server via IMAP (i.e. by sending and
      automagically processing a special email message).

Typical work-flow would be aimed at users who like to automatically sort 
their email prior to reading it.  The goal is to have nearly all email 
sorted into folders so that most mail remaining in the Inbox is likely 
to be leftover spam missed by whatever spam filters are being used.  In 
other words, the filters tend to effectively serve as white lists.

Examples of unusual rules that don't seem to be supported by most email 
clients:

    * When you send an email, add the recipient to a filter such that
      email from that recipient goes to a "Unfiltered Replies" folder if
      it does not match any other filter.
    * Receiving email with certain fields matching certain regular
      expressions could automatically create a new folder and filter e.g.:
          o List-Id: "SF Bay Area Python group <baypiggies.python.org>"
            yields a new folder "Lists/SF Bay Area Python group" with a
            corresponding rule
          o X-Launchpad-Bug: "product=phatch; milestone=..." yields a
            new folder "Bugs/Phatch" with a corresponding rule
          o X-Bugzilla-Product: "Shrubbery" yields a new folder
            "Bugs/Shrubbery" with a corresponding rule


Thanks,
Ken

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From greg.ewing at canterbury.ac.nz  Fri Mar  5 00:36:06 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Fri, 05 Mar 2010 18:36:06 +1300
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <7xlje8lb9o.fsf@ruckus.brouhaha.com>
References: <mailman.34.1267409372.23598.python-list@python.org>	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<mailman.64.1267463648.23598.python-list@python.org>	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>	<7xljebyl56.fsf@ruckus.brouhaha.com>	<mailman.70.1267468806.23598.python-list@python.org>	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>	<7xhbozrfy4.fsf@ruckus.brouhaha.com>	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>	<7x635fdcth.fsf@ruckus.brouhaha.com>	<mailman.199.1267631220.23598.python-list@python.org>
	<7xlje8lb9o.fsf@ruckus.brouhaha.com>
Message-ID: <7vbiuqF4utU1@mid.individual.net>

Paul Rubin wrote:
> ReST was another solution in search of a problem.

I think the basic idea behind ReST is quite good, i.e.
understanding as markup various typographical conventions
that make sense in plain text, such as underlined
headings, bullets, numbered paragraphs.

Unfortunately it went overboard with a slew of cryptic
codes for footnotes, hyperlinks, etc. that nobody would
naturally think to use in a plain text document.

-- 
Greg


From showell30 at yahoo.com  Fri Mar  5 00:36:51 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Thu, 4 Mar 2010 21:36:51 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org> 
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com> 
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
	<mailman.199.1267631220.23598.python-list@python.org> 
	<7xlje8lb9o.fsf@ruckus.brouhaha.com> <7vbiuqF4utU1@mid.individual.net>
Message-ID: <696158a0-dccf-4fa2-b6ab-bb1c4cb2e219@m35g2000prh.googlegroups.com>

On Mar 4, 9:36?pm, Gregory Ewing <greg.ew... at canterbury.ac.nz> wrote:
> Paul Rubin wrote:
> > ReST was another solution in search of a problem.
>
> I think the basic idea behind ReST is quite good, i.e.
> understanding as markup various typographical conventions
> that make sense in plain text, such as underlined
> headings, bullets, numbered paragraphs.
>
> Unfortunately it went overboard with a slew of cryptic
> codes for footnotes, hyperlinks, etc. that nobody would
> naturally think to use in a plain text document.
>

The same thing happened with YAML to a certain extent, from my
perspective.  YAML was never meant to be an exact alternative to XML,
but its basic premise was sound--use indentation for more elegant
syntax, and model its semantics more toward how data actually gets
used internally by scripting languages in particular.  But there is
also some featuritis with YAML that makes it hard to digest and
needlessly cumbersome to implement.

JSON is not perfect by any means, but I consider it to be a more
useful descendant of XML and YAML, even if it did not directly borrow
from either.  (YAML and JSON are certainly similar, but that could be
a coincidental convergence.)  Even if YAML itself has not been a
resounding success, it set the bar to a certain degree.


From aahz at pythoncraft.com  Fri Mar  5 01:00:50 2010
From: aahz at pythoncraft.com (Aahz)
Date: 4 Mar 2010 22:00:50 -0800
Subject: WANTED: A good name for the pair (args, kwargs)
References: <hmo94l$9hb$1@south.jnrs.ja.net>
	<mailman.284.1267707023.23598.python-list@python.org>
Message-ID: <hmq6mi$dfg$1@panix3.panix.com>

In article <mailman.284.1267707023.23598.python-list at python.org>,
Tim Chase  <python.list at tim.thechases.com> wrote:
>Jonathan Fine wrote:
>>
>> We can call a function fn using
>>      val = fn(*args, **kwargs)
>> 
>> I'm looking for a good name for the pair (args, kwargs).  Any suggestions?
>> 
>> For now I'll use argpair, but if anyone has a better idea, I'll use it.
>
>In the legacy of C and Java (okay, that doesn't carry _much_ weight
>with me), I'd go with "varargs" to refer to the pair of (args, kwargs)

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

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From nagle at animats.com  Fri Mar  5 01:35:45 2010
From: nagle at animats.com (John Nagle)
Date: Thu, 04 Mar 2010 22:35:45 -0800
Subject: NoSQL Movement?
In-Reply-To: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
Message-ID: <4b90a1f8$0$1629$742ec2ed@news.sonic.net>

Xah Lee wrote:
> recently i wrote a blog article on The NoSQL Movement
> at http://xahlee.org/comp/nosql.html
> 
> i'd like to post it somewhere public to solicit opinions, but in the
> 20 min or so, i couldn't find a proper newsgroup, nor private list
> that my somewhat anti-NoSQL Movement article is fitting.

    Too much rant, not enough information.

    There is an argument against using full relational databases for
some large-scale applications, ones where the database is spread over
many machines.  If the database can be organized so that each transaction
only needs to talk to one database machine, the locking problems become
much simpler.  That's what BigTable is really about.

    For many web applications, each user has more or less their own data,
and most database activity is related to a single user.  Such
applications can easily be scaled up with a system that doesn't
have inter-user links.  There can still be inter-user references,
but without a consistency guarantee.  They may lead to dead data,
like Unix/Linux symbolic links.  This is a mechanism adequate
for most "social networking" sites.

    There are also some "consistent-eventually" systems, where a query
can see old data.  For non-critical applications, those can be
very useful.  This isn't a SQL/NoSQL thing; MySQL asynchronous
replication is a "consistent-eventually" system.  Wikipedia uses
that for the "special" pages which require database lookups.

    If you allow general joins across any tables, you have to have all
the very elaborate interlocking mechanisms of a distributed database.
The serious database systems (MySQL Cluster and Oracle, for example)
do offer that, but there are usually
substantial complexity penalties, and the databases have to be carefully
organized to avoid excessive cross-machine locking.  If you don't need
general joins, a system which doesn't support them is far simpler.

    					John Nagle


From greg.ewing at canterbury.ac.nz  Fri Mar  5 01:54:48 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Fri, 05 Mar 2010 19:54:48 +1300
Subject: NoSQL Movement?
In-Reply-To: <Xns9D31C31E6FFA3duncanbooth@127.0.0.1>
References: <Xns9D318550EF1D6duncanbooth@127.0.0.1>
	<mailman.289.1267714060.23598.python-list@python.org>
	<Xns9D31C31E6FFA3duncanbooth@127.0.0.1>
Message-ID: <7vbnieFovtU1@mid.individual.net>

Duncan Booth wrote:
> Did I mention that bigtable doesn't require you to have the same 
> columns in every record? The main use of bigtable (outside of Google's 
> internal use) is Google App Engine and that apparently uses one table.
> 
> Not one table per application, one table total. It's a big table.

Seems to me in that situation the term "table" ceases to
have any meaning. If every record can have its own unique
structure, and data from completely unrelated applications
can all be thrown in together, there's no more reason to
call it a "table" than, say, "file", "database" or "big
pile of data".

-- 
Greg


From news123 at free.fr  Fri Mar  5 02:21:30 2010
From: news123 at free.fr (News123)
Date: Fri, 05 Mar 2010 08:21:30 +0100
Subject: _winreg and accessing registry settings of another user
In-Reply-To: <917f4593-f50e-424c-a21b-04c376e77164@33g2000yqj.googlegroups.com>
References: <4b90252b$0$17806$426a34cc@news.free.fr>
	<917f4593-f50e-424c-a21b-04c376e77164@33g2000yqj.googlegroups.com>
Message-ID: <4b90b0fa$0$8332$426a74cc@news.free.fr>

Mensanator wrote:
> On Mar 4, 3:24 pm, News123 <news... at free.fr> wrote:
>> Hi,
>>
>> I have administrator privilege  on a window host and would like to write
>> a script setting some registry entries for other users.
> 
> Why? Are you writing a virus?
> 
Writing a virus in python???? Why not? though I didn't think about it as
ideal choice of implementing viruses.
For my script to run I have to run it explicitly as administrator
(as being required by Vista / Win7).


My script shall be part of installing and configuring a PC with some
default settings with the minimal amount of human administrator
interactions.

The steps:
- install windows
- install python
- setup one admin account and one or more user accounts (without admin
privileges)
- run a script, that preconfigures registry settings for some users.

As mentioned before I see at least two possible ways and achieving this
but lack information for either.


1.) run a sub process or thread as another user (the user wouldn't even
have a password during the installation phase) and change the registry
from this thread. I have no experience of running 'suid' under windows.


2.) being able to load the 'hive' of another user into the registry and
be therefore able to change his settings. I didn't find a function
allowing _winreg to load additional 'hives'



bye


N


From greg.ewing at canterbury.ac.nz  Fri Mar  5 02:33:44 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Fri, 05 Mar 2010 20:33:44 +1300
Subject: Generic singleton
In-Reply-To: <mailman.242.1267650721.23598.python-list@python.org>
References: <mailman.222.1267642515.23598.python-list@python.org>	<m2iq9d197a.fsf@googlemail.com>
	<mailman.242.1267650721.23598.python-list@python.org>
Message-ID: <7vbprcF49gU1@mid.individual.net>

mk wrote:

> Or I could make my life simpler and use global variable. :-)

Indeed. You actually *have* a global variable already, you've
just hidden it inside another object. That doesn't make it any
less global, though.

If you want to defer creation of the object until the first
time it's used, use a function that creates an instance the
first time it's called. Your Singleton class is really just
an overly elaborate way of implementing such a function.

-- 
Greg


From no.email at nospam.invalid  Fri Mar  5 02:46:46 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Thu, 04 Mar 2010 23:46:46 -0800
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org>
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
	<mailman.199.1267631220.23598.python-list@python.org>
	<7xlje8lb9o.fsf@ruckus.brouhaha.com>
	<e6f5c938-dfac-4c0c-8b4b-cbda2a670dcf@x1g2000prb.googlegroups.com>
Message-ID: <7xvddbqkgp.fsf@ruckus.brouhaha.com>

Steve Howell <showell30 at yahoo.com> writes:
>> Modify the JSON standard so that "JSON 2.0" allows comments.
>
> If you don't control the JSON standard, providing a compelling
> alternative to JSON might be the best way to force JSON to accomodate
> a wider audience. 

Ehh, either the JSON standardizers care about this issue or else they
don't.  JSON (as currently defined) is a machine-to-machine
serialization format and just isn't that good a choice for handwritten
files.  Adding a comment specification is a small perturbation that
might be accepted into the standard, but a big departure like RSON is a
whole nother creature.

> How many hundreds of thousands of people have had to deal with XML
> without receiving its benefits?  Do well-established standards get an
> exemption from the rule that software is not allowed to annoy non-
> willing users of it?

We already have to deal with XML.  So using XML for config files doesn't
require anyone to deal with any lousy formats that they didn't have to
deal with before.  So the basic answer to your question about
well-established standards is yes: one annoying but standardized format
is better than multiple annoying unstandardized ones.


From no.email at nospam.invalid  Fri Mar  5 02:50:15 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Thu, 04 Mar 2010 23:50:15 -0800
Subject: Failure in test_hashlib.py and test_hmac.py
References: <175865db-f64a-4633-8e36-ab4a5a5eaccf@x22g2000yqx.googlegroups.com>
Message-ID: <7xr5nzqkaw.fsf@ruckus.brouhaha.com>

Chris Lieb <chris.lieb at gmail.com> writes:
> I am building Python 2.6.4 on a shared server and am encountering test
> failures in test_hashlib.py and test_hmac.py,

You should certainly file a bug report (bugs.python.org).  If you want
to debug it yourself and include a patch, that's great.  Otherwise, just
file the report.

    In the case of test_hashlib.py, it segfaulted on the first sha512 test
    when I didn't have the debugging options enabled.  Only after enabling
    debugging did I get FAIL's for the sha512 tests.

    Does anyone know what is causing these failures?

Please be precise about the hw and compiler versions.


From stefan_ml at behnel.de  Fri Mar  5 03:03:36 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 05 Mar 2010 09:03:36 +0100
Subject: Partly erratic wrong behaviour, Python 3, lxml
In-Reply-To: <qotlje7ydd4.fsf@ruuvi.it.helsinki.fi>
References: <qotr5o0xt3l.fsf@ruuvi.it.helsinki.fi>	<mailman.308.1267729874.23598.python-list@python.org>
	<qotlje7ydd4.fsf@ruuvi.it.helsinki.fi>
Message-ID: <hmqdso$ubl$1@dough.gmane.org>

Jussi Piitulainen, 04.03.2010 22:40:
> Stefan Behnel writes:
>> Jussi Piitulainen, 04.03.2010 11:46:
>>> I am observing weird semi-erratic behaviour that involves Python 3
>>> and lxml, is extremely sensitive to changes in the input data, and
>>> only occurs when I name a partial result. I would like some help
>>> with this, please. (Python 3.1.1; GNU/Linux; how do I find lxml
>>> version?)
>>
>> Here's how to find the version:
>>
>> http://codespeak.net/lxml/FAQ.html#i-think-i-have-found-a-bug-in-lxml-what-should-i-do
>
> Ok, thank you. Here's the results:
>
> >>> print(et.LXML_VERSION, et.LIBXML_VERSION,
> ...       et.LIBXML_COMPILED_VERSION, et.LIBXSLT_VERSION,
> ...       et.LIBXSLT_COMPILED_VERSION)
> (2, 2, 4, 0) (2, 6, 26) (2, 6, 26) (1, 1, 17) (1, 1, 17)

I can't reproduce this with the latest lxml trunk (and Py3.2 trunk) and 
libxml2 2.7.6, even after running your test script for quite a while. I'd 
try to upgrade the libxml2 version.

Stefan



From lipun4u at gmail.com  Fri Mar  5 03:04:13 2010
From: lipun4u at gmail.com (asit)
Date: Fri, 5 Mar 2010 00:04:13 -0800 (PST)
Subject: indentation error
Message-ID: <f1e05b1f-3812-490a-9e6d-4a83aef7fe1d@q2g2000pre.googlegroups.com>

Consider the following code

import stat, sys, os, string, commands

try:
    pattern = raw_input("Enter the file pattern to search for :\n")
    commandString = "find " + pattern
    commandOutput = commands.getoutput(commandString)
    findResults = string.split(commandOutput, "\n")
    print "Files : "
    print commandOutput
    print "============================="
    for file in findResults:
        mode = stat.S_IMODE(os.lstat(file)[stat.ST_MODE])
        print "\nPermissions for file", file, ":"
        for level in "USR", "GRP", "OTH":
            for perm in "R", "W", "X":
                if mode & getattr(stat,"S_I"+perm+level):
                    print level, " has ", perm, " permission"
                else:
                    print level, " does NOT have ", perm, "
permission"
except:
    print "There was a problem - check the message above"


According to me, indentation is ok. but the python interpreter gives
an indentation error

[asit ~/py] $ python search.py
  File "search.py", line 7
    findResults = string.split(commandOutput, "\n")
                                                  ^
IndentationError: unindent does not match any outer indentation level


From steve at REMOVE-THIS-cybersource.com.au  Fri Mar  5 03:05:16 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 08:05:16 GMT
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org>
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
	<mailman.199.1267631220.23598.python-list@python.org>
	<7xlje8lb9o.fsf@ruckus.brouhaha.com> <7vbiuqF4utU1@mid.individual.net>
Message-ID: <4b90bb3c$0$27863$c3e8da3@news.astraweb.com>

On Fri, 05 Mar 2010 18:36:06 +1300, Gregory Ewing wrote:

> Paul Rubin wrote:
>> ReST was another solution in search of a problem.
> 
> I think the basic idea behind ReST is quite good, i.e. understanding as
> markup various typographical conventions that make sense in plain text,
> such as underlined headings, bullets, numbered paragraphs.
> 
> Unfortunately it went overboard with a slew of cryptic codes for
> footnotes, hyperlinks, etc. that nobody would naturally think to use in
> a plain text document.


I use footnotes all the time[1] in plain text documents and emails. I 
don't think there's anything bizarre about it at all.






[1] When I say "all the time", I actually mean occasionally.


-- 
Steven


From jimgardener at gmail.com  Fri Mar  5 03:05:18 2010
From: jimgardener at gmail.com (jimgardener)
Date: Fri, 5 Mar 2010 00:05:18 -0800 (PST)
Subject: comparing two lists
Message-ID: <d817b4e1-192b-40e6-9a9d-75c3cbbd4ccd@t31g2000prh.googlegroups.com>

hi
I have two lists of names.I need to find the difference between these
two lists.I tried to do it using sets.But I am wondering if there is a
better way to do it.Please tell me if there is a more elegant way.
thanks,
jim

my code snippet follows..

oldlst=['jon','arya','ned','bran']
newlst=['jaime','jon','cersei']

newlyadded=set(newlst)-set(oldlst)
removed=set(oldlst)-set(newlst)
unchanged=set(oldlst)& set(newlst)
print '%d were newly added= %s'%(len(newlyadded),list(newlyadded))
print '%d were removed=%s'%(len(removed),list(removed))
print '%d were unchanged=%s'%(len(unchanged),list(unchanged))

this produces the output
--------------
2 were newly added= ['jaime', 'cersei']
3 were removed=['ned', 'arya', 'bran']
1 were unchanged=['jon']


From greg.ewing at canterbury.ac.nz  Fri Mar  5 03:10:01 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Fri, 05 Mar 2010 21:10:01 +1300
Subject: Passing FILE * types using ctypes
In-Reply-To: <bac1318c-d5a2-4dfc-a716-2977959f7a06@b30g2000yqd.googlegroups.com>
References: <a83319d7-c199-4532-9816-d002f7fd7914@q16g2000yqq.googlegroups.com>
	<bac1318c-d5a2-4dfc-a716-2977959f7a06@b30g2000yqd.googlegroups.com>
Message-ID: <7vbrveFegeU1@mid.individual.net>

Francesco Bochicchio wrote:

> Python file objects have a method fileno() whic returns the 'C file
> descriptor', i.e. the number used by low level IO in python as well as
> in C.
> I would use this as interface between python and C and then in the C
> function using fdopen to get a FILE * for an already open file for
> which you have a file descriptor.

But note that this will be a *new* stdio file buffer
attached to the same file descriptor, not the same one
that the Python file object is using. This may or may
not be a problem depending on what you're trying to
do.

If you need the same FILE * that Python is using, you
may need to use ctypes to extract it out of the file
object.

-- 
Greg


From greg.ewing at canterbury.ac.nz  Fri Mar  5 03:25:47 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Fri, 05 Mar 2010 21:25:47 +1300
Subject: Docstrings considered too complicated
In-Reply-To: <4b9072b2$0$27863$c3e8da3@news.astraweb.com>
References: <20100224212303.242222c6@geekmail.INVALID>	<d4408f49-37f8-4c71-854e-e33ffdf1dfd3@g28g2000yqh.googlegroups.com>	<20100227191040.6c77f2d8@geekmail.INVALID>	<759ebd7f-c5c5-4f8f-9d5b-06ec6e5180b8@m27g2000prl.googlegroups.com>	<20100301140943.4edca16b@geekmail.INVALID>
	<4b8be8f7$1@dnews.tpgi.com.au>	<20100301182255.3de59bc6@geekmail.INVALID>	<mailman.66.1267465347.23598.python-list@python.org>	<20100301212954.7aa0b99d@geekmail.INVALID>
	<87eik3zmi8.fsf@benfinney.id.au>	<20100302184056.743a71e7@geekmail.INVALID>	<mailman.129.1267553139.23598.python-list@python.org>	<20100302225156.67171851@geekmail.INVALID>
	<877hpuxpdf.fsf@benfinney.id.au>	<7v6ae4Ff37U1@mid.individual.net>	<pan.2010.03.03.05.48.49@REMOVE.THIS.cybersource.com.au>	<7v9g9qF1nkU1@mid.individual.net>
	<4b9072b2$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <7vbssvFjgcU1@mid.individual.net>

Steven D'Aprano wrote:

> (a) Can we objectively judge the goodness of code, or is it subjective?
> 
> (b) Is goodness of code quantitative, or is it qualitative?

Yes, I'm not really talking about numeric vs. non-numeric,
but objective vs. subjective. The measurement doesn't have
to yield a numeric result, it just has to be doable by some
objective procedure. If you can build a machine to do it,
then it's objective. If you have to rely on the judgement of
a human, then it's subjective.

> But we can make quasi-objective judgements, by averaging out all the 
> individual quirks of subjective judgement:
> 
> (1) Take 10 independent judges who are all recognised as good Python 
> coders by their peers, and ask them to give a score of 1-5 for the 
> quality of the comments...

Yes, but this is an enormous amount of effort to go to, and
at the end of the day, the result is only reliable in a
statistical sense.

This still seems to me to be qualitatively different from
something like testing the tensile strength of a piece of
steel. You can apply a definite procedure and obtain a
definite result, and no human judgement is required at all.

-- 
Greg


From mjoachimiak at gmail.com  Fri Mar  5 03:30:49 2010
From: mjoachimiak at gmail.com (Michael Joachimiak)
Date: Fri, 5 Mar 2010 10:30:49 +0200
Subject: ImportError: No module named glib
Message-ID: <7c857e8c1003050030x39b75c98veace4ef8eebe606a@mail.gmail.com>

I am too new to python.
If anybody has an idea what to do please help.
when I use

import glib

in my code I get this:

>>> import glib
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named glib

:~$ python -V
Python 2.6.4

/usr/lib/libpyglib-2.0-python2.6.so.0.0.0 exists in version 2.18.0-0ubuntu2

:~$ pkg-config glib-2.0 --cflags --libs
-I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include  -lglib-2.0


From eckhardt at satorlaser.com  Fri Mar  5 03:32:17 2010
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Fri, 05 Mar 2010 09:32:17 +0100
Subject: indentation error
References: <f1e05b1f-3812-490a-9e6d-4a83aef7fe1d@q2g2000pre.googlegroups.com>
Message-ID: <h5s667-ed3.ln1@satorlaser.homedns.org>

asit wrote:
>     pattern = raw_input("Enter the file pattern to search for :\n")
>     commandString = "find " + pattern
>     commandOutput = commands.getoutput(commandString)
>     findResults = string.split(commandOutput, "\n")
>     print "Files : "
>     print commandOutput
>     print "============================="
>     for file in findResults:
>         mode = stat.S_IMODE(os.lstat(file)[stat.ST_MODE])
>         print "\nPermissions for file", file, ":"
>         for level in "USR", "GRP", "OTH":
>             for perm in "R", "W", "X":
>                 if mode & getattr(stat,"S_I"+perm+level):
>                     print level, " has ", perm, " permission"
>                 else:
>                     print level, " does NOT have ", perm, "
> permission"
[...]
> According to me, indentation is ok. but the python interpreter gives
> an indentation error
> 
> [asit ~/py] $ python search.py
>   File "search.py", line 7
>     findResults = string.split(commandOutput, "\n")
>                                                   ^
> IndentationError: unindent does not match any outer indentation level

Hard to tell, since your posting was already line-broken which already
changes the correctness. In any case, watch for tabs/spaces, many editors
have an option to display whitespace.

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From r1chardj0n3s at gmail.com  Fri Mar  5 03:39:49 2010
From: r1chardj0n3s at gmail.com (Richard Jones)
Date: Fri, 5 Mar 2010 19:39:49 +1100
Subject: 10th Python Game Programming Challenge in three weeks
Message-ID: <249b6faa1003050039n17e16b0p80ef8474c2d94167@mail.gmail.com>

The 10th Python Game Programming Challenge (http://pyweek.org/) will
run from the 28th of March to the 4th of April.

The PyWeek challenge:

- Invites entrants to write a game in one week from scratch either as
an individual or in a team,
- Is intended to be challenging and fun,
- Will hopefully increase the public body of game tools, code and expertise,
- Will let a lot of people actually finish a game, and
- May inspire new projects (with ready made teams!)

Come along and play, it's lots of fun :)


      Richard


From gh at ghaering.de  Fri Mar  5 03:40:50 2010
From: gh at ghaering.de (=?ISO-8859-1?Q?Gerhard_H=E4ring?=)
Date: Fri, 5 Mar 2010 09:40:50 +0100
Subject: [ANN] pysqlite 2.6.0 released
Message-ID: <496f9fbb1003050040k7c057e2s1941d216eb46ce5b@mail.gmail.com>

pysqlite 2.6.0 released
=======================

Release focus: Synchronize with sqlite3 module in Python trunk.

pysqlite is a DB-API 2.0-compliant database interface for SQLite.

SQLite is a in-process library that implements a self-contained,
serverless, zero-configuration, transactional SQL database
engine.

Go to http://pysqlite.googlecode.com/ for downloads, online documentation and
for reporting bugs.

Changes
=======

- pysqlite can now be built against Python versions without thread support
- PyDict_SetItem is now checked so you cannot shoot yourself in the
foot, even if you try to
- More checks for closed connections were added to avoid possible segfaults

Compatibility
=============

Warning:

pysqlite is not supported for Python < 2.5 any longer. This release still
builds against Python 2.3 and 2.4, but I won't bother with these in the future.


From vlastimil.brom at gmail.com  Fri Mar  5 03:50:03 2010
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Fri, 5 Mar 2010 09:50:03 +0100
Subject: comparing two lists
In-Reply-To: <d817b4e1-192b-40e6-9a9d-75c3cbbd4ccd@t31g2000prh.googlegroups.com>
References: <d817b4e1-192b-40e6-9a9d-75c3cbbd4ccd@t31g2000prh.googlegroups.com>
Message-ID: <9fdb569a1003050050y5705dd4bi6e757e59adb40d66@mail.gmail.com>

2010/3/5 jimgardener <jimgardener at gmail.com>:
> hi
> I have two lists of names.I need to find the difference between these
> two lists.I tried to do it using sets.But I am wondering if there is a
> better way to do it.Please tell me if there is a more elegant way.
> thanks,
> jim
>
> my code snippet follows..
>
> oldlst=['jon','arya','ned','bran']
> newlst=['jaime','jon','cersei']
>
> newlyadded=set(newlst)-set(oldlst)
> removed=set(oldlst)-set(newlst)
> unchanged=set(oldlst)& set(newlst)
> print '%d were newly added= %s'%(len(newlyadded),list(newlyadded))
> print '%d were removed=%s'%(len(removed),list(removed))
> print '%d were unchanged=%s'%(len(unchanged),list(unchanged))
>
> this produces the output
> --------------
> 2 were newly added= ['jaime', 'cersei']
> 3 were removed=['ned', 'arya', 'bran']
> 1 were unchanged=['jon']
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Hi,
I guess for lists with unique items and order insignificant this is
just fine; you may also check difflib, if it suits your needs; there
are multiple comparing and displaying possibilities, e.g.:

>>> import difflib
>>> print "\n".join(difflib.unified_diff(['jon','arya','ned','bran'], ['jaime','jon','cersei']))
---

+++

@@ -1,4 +1,3 @@

+jaime
 jon
-arya
-ned
-bran
+cersei
>>>

hth,
   vbr


From duncan.booth at invalid.invalid  Fri Mar  5 04:07:49 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 5 Mar 2010 09:07:49 GMT
Subject: NoSQL Movement?
References: <Xns9D318550EF1D6duncanbooth@127.0.0.1>
	<mailman.289.1267714060.23598.python-list@python.org>
	<Xns9D31C31E6FFA3duncanbooth@127.0.0.1>
	<7vbnieFovtU1@mid.individual.net>
Message-ID: <Xns9D325BBB95CDduncanbooth@127.0.0.1>

Gregory Ewing <greg.ewing at canterbury.ac.nz> wrote:

> Duncan Booth wrote:
>> Did I mention that bigtable doesn't require you to have the same 
>> columns in every record? The main use of bigtable (outside of 
Google's 
>> internal use) is Google App Engine and that apparently uses one 
table.
>> 
>> Not one table per application, one table total. It's a big table.
> 
> Seems to me in that situation the term "table" ceases to
> have any meaning. If every record can have its own unique
> structure, and data from completely unrelated applications
> can all be thrown in together, there's no more reason to
> call it a "table" than, say, "file", "database" or "big
> pile of data".
> 
I think it depends on how you look at things.

AppEngine uses a programming model which behaves very much as though you 
do have multiple tables: you use Django's programming model to wrap each 
record in a class, or you can use Gql query languages which looks very 
similar to SQL and again the class names appear in the place of table 
names.

So conceptually thinking of it as separate tables make a lot of sense, 
but the underlying implementation is apparently a single table where 
records simply have a type field that is used to instantiate the proper 
class on the Python side (and another hidden application field to 
prevent you accessing another application's data). Also of course 
records with the same type still may not all have the same columns if 
you change the class definition between runs, so even at this level they 
aren't tables in the strict SQL sense.

There may of course be other applications using bigtable where the 
bigtable(s) look much more like ordinary tables, but I don't know what 
they are.

>From your suggested terms, I'd agree you could call it a database rather 
than a table but I think it's too structured for "file" or "big pile of 
data" to be appropriate.

-- 
Duncan Booth http://kupuguy.blogspot.com


From magnicida at gmail.com  Fri Mar  5 04:37:04 2010
From: magnicida at gmail.com (Juan Pedro Bolivar Puente)
Date: Fri, 05 Mar 2010 11:37:04 +0200
Subject: NoSQL Movement?
In-Reply-To: <7bfeffcd-722e-4df4-8455-7710207d9c7e@a18g2000yqc.googlegroups.com>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<26bd4a5c-4d66-4597-a0ee-b4990f468e68@g26g2000yqn.googlegroups.com>
	<e0a86785-bb68-4977-8864-010ca4f71a6c@19g2000yqu.googlegroups.com>
	<hmooea$uga$1@news.bytemine.net>
	<7bfeffcd-722e-4df4-8455-7710207d9c7e@a18g2000yqc.googlegroups.com>
Message-ID: <4B90D0C0.7020508@gmail.com>

On 04/03/10 19:52, ccc31807 wrote:
> On Mar 4, 11:51 am, Juan Pedro Bolivar Puente <magnic... at gmail.com>
> wrote:
>> No, relations are data.
> 
> This depends on your definition of 'data.' I would say that
> relationships is information gleaned from the data.
> 
>> "Data is data" says nothing. Data is
>> information.
> 
> To me, data and information are not the same thing, and in particular,
> data is NOT information. To me, information consists of the sifting,
> sorting, filtering, and rearrangement of data that can be useful in
> completing some task. As an illustration, consider some very large
> collection of ones and zeros -- the information it contains depends on
> whether it's views as a JPEG, an EXE, XML, WAV, or other sort of
> information processing device. Whichever way it's processed, the
> 'data' (the ones and zeros) stay the same, and do not constitute
> 'information' in their raw state.
> 
>> Actually, all data are relations: relating /values/ to
>> /properties/ of /entities/. Relations as understood by the "relational
>> model" is nothing else but assuming that properties and entities are
>> first class values of the data system and the can also be related.
> 
> Well, this sort of illustrates my point. The 'values' of 'properties'
> relating to specific 'entities' depends on how one processes the data,
> which can be processed various ways. For example, 10000001 can either
> be viewed as the decimal number 65 or the alpha character 'A' but the
> decision as to how to view this value isn't inherent in the data
> itself, but only as an artifact of our use of the data to turn it into
> information.
> 

Well, it depends as you said on the definition of information; actually
your definition of data fits into the information-theorical definition
of information as sequence of symbols... But I understand that in other
context /information/ can also mean the next level of abstraction on top
of /data/, in the same way as /knowledge/ is the next level of
abstraction on top of information; lets ground or basis on that.

In any case, your definition and George's still support my point of view
where relations are data: they are stored in the computer as a sequence
of ones and zeroes and is indistinguishable from any other thing in the
data space in that sense. Of course, it is a key data to be able to
recover information and specially to add new information consistently to
the data storage... That SQL includes special syntax for manipulating
relations should not hide this fact; and one can still query the
relational information in the same way one would query non-relational
data in most DBMS anyway...

Anyway I'm sorry for drifting the conversation away... Going back to the
main topic, I agree with the general view on this thread that relational
databases (information-bases ? ;) and non-relational ones are there to
do some different jobs. It is just by carefully examining a problem that
we can define which one fits it better; with relational databases having
the clear advantage that is mathematically grounded basis makes its
fitness for most problems quite clear, while the preference for
non-relational systems is a more technical and empirical problem of the
trade-offs of consistency vs scalability and so on.

JP



From no.email at nospam.invalid  Fri Mar  5 04:45:54 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Fri, 05 Mar 2010 01:45:54 -0800
Subject: loop over list and process into groups
References: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>
	<5e9126f7-f9e2-4c38-8dd5-dc174204fd71@d27g2000yqf.googlegroups.com>
Message-ID: <7xhbov2jal.fsf@ruckus.brouhaha.com>

lbolla <lbolla at gmail.com> writes:
> for k, g in groupby(clean_up(data) , key=lambda s: s.startswith('VLAN')):
> 	if k:
> 		key = list(g)[0].replace('VLAN','')

This is the nicest solution, I think.  Mine was more cumbersome.


From mail at timgolden.me.uk  Fri Mar  5 04:59:17 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 05 Mar 2010 09:59:17 +0000
Subject: _winreg and accessing registry settings of another user
In-Reply-To: <4b90b0fa$0$8332$426a74cc@news.free.fr>
References: <4b90252b$0$17806$426a34cc@news.free.fr>	<917f4593-f50e-424c-a21b-04c376e77164@33g2000yqj.googlegroups.com>
	<4b90b0fa$0$8332$426a74cc@news.free.fr>
Message-ID: <4B90D5F5.4040802@timgolden.me.uk>

On 05/03/2010 07:21, News123 wrote:
> My script shall be part of installing and configuring a PC with some
> default settings with the minimal amount of human administrator
> interactions.
>
> The steps:
> - install windows
> - install python
> - setup one admin account and one or more user accounts (without admin
> privileges)
> - run a script, that preconfigures registry settings for some users.

> 2.) being able to load the 'hive' of another user into the registry and
> be therefore able to change his settings. I didn't find a function
> allowing _winreg to load additional 'hives'


You can use a combination of the win32security, win32api and win32profile
modules from the pywin32 package for this:

<code>
import win32security
import win32api
import win32profile

username = "USERNAME"
domain = "DOMAIN"
password = "PASSWORD"

hUser = win32security.LogonUser (
   username,
   domain,
   password,
   win32security.LOGON32_LOGON_NETWORK,
   win32security.LOGON32_PROVIDER_DEFAULT
)
hReg = win32profile.LoadUserProfile (
   hUser,
   {"UserName" : "fozrestore"}
)
try:
   print win32api.RegEnumKeyExW (hReg)
finally:
   win32profile.UnloadUserProfile (hUser, hReg)

</code>

TJG


From phil at freehackers.org  Fri Mar  5 05:01:06 2010
From: phil at freehackers.org (BlueBird)
Date: Fri, 5 Mar 2010 02:01:06 -0800 (PST)
Subject: SOAP 1.2 Python client ?
References: <5a36bd30-6cbd-48ca-9ca3-dc34c97e03c0@o30g2000yqb.googlegroups.com>
	<mailman.227.1267644925.23598.python-list@python.org>
Message-ID: <fcaa9201-5e94-4cf3-af6e-78c1bbcb6144@t20g2000yqe.googlegroups.com>

On 3 mar, 20:35, Stefan Behnel <stefan... at behnel.de> wrote:
> BlueBird, 03.03.2010 17:32:
>
> > I am looking for a SOAP 1.2 python client. To my surprise, it seems
> > that this does not exist. Does anybody know about this ?
>
> SOAP may be an overly bloated protocol, but it's certainly not black magic.
> It's not hard to do manually if you really need to:
>
> http://effbot.org/zone/element-soap.htm

But this requires a goog knowloedge of SOAP, in order to parse
everything correctly. The reason I want to use a ready-made client is
that I have about zero knowledge about SOAP, and even more in the
differences between SOAP 1.1 and 1.2 .

cheers,

Philippe


From aurelien.gourrier at yahoo.fr  Fri Mar  5 05:35:42 2010
From: aurelien.gourrier at yahoo.fr (=?iso-8859-1?Q?Aur=E9_Gourrier?=)
Date: Fri, 5 Mar 2010 10:35:42 +0000 (GMT)
Subject: Proper way to return an instance of a class from a class method ?
Message-ID: <918065.487.qm@web23104.mail.ird.yahoo.com>

Dear all,

I have what will probably sound as stupid questions for experienced Python users... which I am not, hence my seeking for some help.

------------
QUESTION 1:
I've implemeted a class which defines a container with 2 lists of data (with some specific format).
Some of the methods simply transform these data and therefore return a new container of 2 lists.
I want to be able to use these results without having to re-instanciate them, so I return them as instances of the class:

class MyClass:
    def __init__(self, data):
        #various checks for the format and content of data (data = [x,y] where x and y are 2 lists of floats)
        self.data = data
        
    def transformdata(self):
        newdata = transform(data)
        return MyClass(newdata)

In this way I can do:

x = list1
y = list2
data = MyClass([x,y])
moddata = data.transformdata()
moddata2 = moddata.transformdata()

Is that the correct way to go (i.e. is this pythonic) ? What I want to avoid is:

moddata = data.transformdata()
moddata2 = MyClass(moddata).transformdata()

------------
QUESTION 2:
If I go this way, I have a second problem: if I create a new class which inherits from the previous, I would expect/like the methods from the initial class to return instances from the new class:

class MyClass2(MyClass):

    def othermethods(self):
        return MyClass2(whatever)

Then I get:

x = list1
y = list2
data = MyClass2([x,y])
finaldata = data.transformdata()

My problem is that finaldata is (of course) an instance of MyClass and not MyClass2. How do I deal with this ?

All help will be much appreciated...

Cheers,

Aur?


      
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From jeanmichel at sequans.com  Fri Mar  5 05:44:57 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 05 Mar 2010 11:44:57 +0100
Subject: Evaluate my first python script, please
In-Reply-To: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
Message-ID: <4B90E0A9.6000600@sequans.com>

Pete Emerson wrote:
> I've written my first python program, and would love suggestions for
> improvement.
>
> I'm a perl programmer and used a perl version of this program to guide
> me. So in that sense, the python is "perlesque"
>
> This script parses /etc/hosts for hostnames, and based on terms given
> on the command line (argv), either prints the list of hostnames that
> match all the criteria, or uses ssh to connect to the host if the
> number of matches is unique.
>
> I am looking for advice along the lines of "an easier way to do this"
> or "a more python way" (I'm sure that's asking for trouble!) or
> "people commonly do this instead" or "here's a slick trick" or "oh,
> interesting, here's my version to do the same thing".
>
> I am aware that there are performance improvements and error checking
> that could be made, such as making sure the file exists and is
> readable and precompiling the regular expressions and not calculating
> how many sys.argv arguments there are more than once. I'm not hyper
> concerned with performance or idiot proofing for this particular
> script.
>
> Thanks in advance.
>
> ########################################################
> #!/usr/bin/python
>
> import sys, fileinput, re, os
>
> filename = '/etc/hosts'
>
> hosts = []
>
> for line in open(filename, 'r'):
> 	match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line)
> 	if match is None or re.search('^(?:float|localhost)\.', line):
> continue
> 	hostname = match.group(1)
> 	count = 0
> 	for arg in sys.argv[1:]:
> 		for section in hostname.split('.'):
> 			if section == arg:
> 				count = count + 1
> 				break
> 	if count == len(sys.argv) - 1:
> 		hosts.append(hostname)
>
> if len(hosts) == 1:
> 	os.system("ssh -A " + hosts[0])
> else:
> 	print '\n'.join(hosts)
>   
You've already been given good advices.
Unlike some of those, I don't think using regexp an issue in any way. 
Yes they are not readable, for sure, I 100% agree to that statement, but 
you can make them readable very easily.

# not readable
match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line)


# readable
match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line) # match 
'192.168.200.1   (foo123)'

I gladly understand ppl that are not willing to use regexp (or as last 
resort), but for a perl guy, that should not be an issue.

JM



From bruno.42.desthuilliers at websiteburo.invalid  Fri Mar  5 05:54:28 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 05 Mar 2010 11:54:28 +0100
Subject: NoSQL Movement?
In-Reply-To: <mailman.270.1267671204.23598.python-list@python.org>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>	<mailman.256.1267655008.23598.python-list@python.org>	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
	<mailman.270.1267671204.23598.python-list@python.org>
Message-ID: <4b90e2d0$0$10096$426a34cc@news.free.fr>

Philip Semanchuk a ?crit :
> 
> On Mar 3, 2010, at 5:41 PM, Avid Fan wrote:
> 
>> Jonathan Gardner wrote:
>>
>>> I see it as a sign of maturity with sufficiently scaled software that
>>> they no longer use an SQL database to manage their data. At some point
>>> in the project's lifetime, the data is understood well enough that the
>>> general nature of the SQL database is unnecessary.
>>
>> I am really struggling to understand this concept.
>>
>> Is it the normalised table structure that is in question or the query 
>> language?
>>
>> Could you give some sort of example of where SQL would not be the way 
>> to go.   The only things I can think of a simple flat file databases.
> 
> Well, Zope is backed by an object database rather than a relational one.

And it ended up being a *major* PITA on all Zope projects I've worked on...


From mblume at socha.net  Fri Mar  5 05:54:49 2010
From: mblume at socha.net (mblume)
Date: 05 Mar 2010 10:54:49 GMT
Subject: ImportError: No module named glib
References: <mailman.327.1267777872.23598.python-list@python.org>
Message-ID: <4b90e2f9$0$4046$5402220f@news.sunrise.ch>

Am Fri, 05 Mar 2010 10:30:49 +0200 schrieb Michael Joachimiak:

> I am too new to python.
> If anybody has an idea what to do please help. when I use
> 
> import glib
> 
> in my code I get this:
> 
>>>> import glib
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> ImportError: No module named glib
> 

Shot in the dark: maybe "import pyglib"?
Hint: you can look around in /usr/lib/python to see what files can be imported.

HTH
Martin


From azt113 at gmail.com  Fri Mar  5 06:39:54 2010
From: azt113 at gmail.com (Ines T)
Date: Fri, 5 Mar 2010 11:39:54 +0000 (UTC)
Subject: Selecting MAX from a list
Message-ID: <loom.20100305T123510-94@post.gmane.org>

I need to select a maximum number from a list and then call the variable that
identifies that number, for example:
x1,x2=1, y1,y2=4, z1,z2=3
So I need first to find 4 and then to take y to do additional operations as y-z.
I will appreciate your SOON help!



From santhosh.vkumar at gmail.com  Fri Mar  5 06:41:00 2010
From: santhosh.vkumar at gmail.com (Santhosh Kumar)
Date: Fri, 5 Mar 2010 17:11:00 +0530
Subject: Speech to Text
Message-ID: <404c076d1003050341w327ceec7x63cfb0c01469d35d@mail.gmail.com>

Hi All,
     I am trying to find is there is any way to covert "speech to Text" with
Python in UBUNTU. I googled whr I found Many Text to speech. Some one please
assist me.

-- 
With Regards,
Never Say No,
Santhosh V.Kumar
+919840411410
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From __peter__ at web.de  Fri Mar  5 06:46:54 2010
From: __peter__ at web.de (Peter Otten)
Date: Fri, 05 Mar 2010 12:46:54 +0100
Subject: ImportError: No module named glib
References: <mailman.327.1267777872.23598.python-list@python.org>
Message-ID: <hmqqu1$650$02$1@news.t-online.com>

Michael Joachimiak wrote:

> I am too new to python.
> If anybody has an idea what to do please help.
> when I use
> 
> import glib
> 
> in my code I get this:
> 
>>>> import glib
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> ImportError: No module named glib
> 
> :~$ python -V
> Python 2.6.4
> 
> /usr/lib/libpyglib-2.0-python2.6.so.0.0.0 exists in version
> 2.18.0-0ubuntu2
> 
> :~$ pkg-config glib-2.0 --cflags --libs
> -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include  -lglib-2.0

After the following random walk through my system

$ python
Python 2.6.4 (r264:75706, Dec  7 2009, 18:43:55)
[GCC 4.4.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import glib
>>> glib.__file__
'/usr/lib/pymodules/python2.6/gtk-2.0/glib/__init__.pyc'

In the above __init__.py:
...
from glib._glib import *
_PyGLib_API = _glib._PyGLib_API

del _glib
...

>>> import sys
>>> sys.modules["glib._glib"]
<module 'glib._glib' from 
'/usr/lib/pymodules/python2.6/gtk-2.0/glib/_glib.so'>
>>>
$ dpkg -S _glib.so
python-gobject: /usr/lib/pyshared/python2.5/gtk-2.0/glib/_glib.so
python-gobject: /usr/lib/pyshared/python2.6/gtk-2.0/glib/_glib.so
$

... I believe that you have to install the python-gobject package.

Peter



From steve at REMOVE-THIS-cybersource.com.au  Fri Mar  5 06:48:35 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 11:48:35 GMT
Subject: indentation error
References: <f1e05b1f-3812-490a-9e6d-4a83aef7fe1d@q2g2000pre.googlegroups.com>
Message-ID: <4b90ef93$0$27863$c3e8da3@news.astraweb.com>

On Fri, 05 Mar 2010 00:04:13 -0800, asit wrote:

> Consider the following code
[snip]
> According to me, indentation is ok. but the python interpreter gives an
> indentation error

You can trust the interpreter. There *is* an indentation error. Most 
likely you have mixed spaces and tabs. Try:

python -t -t search.py

instead. (Yes, -t twice.)

On an unrelated note, your code snippet shows a very poor coding style. 
Firstly, bare "except" clauses are VERY bad practice: it will mask bugs 
in your code. Secondly, you should wrap the smallest amount of code in 
the try block as you need.

Something like this is probably better:


pattern = raw_input("Enter the file pattern to search for :\n")
commandString = "find " + pattern
commandOutput = commands.getoutput(commandString)
findResults = string.split(commandOutput, "\n")
print "Files : "
print commandOutput
print "============================="
for file in findResults:
    try:
        mode = stat.S_IMODE(os.lstat(file)[stat.ST_MODE])
    except (IOError, OSError):
        # Print a useless error message so your users will hate you.
        print "There was a problem with %s" % file
        continue
    print "\nPermissions for file", file, ":"
    for level in "USR", "GRP", "OTH":
        for perm in "R", "W", "X":
            if mode & getattr(stat,"S_I"+perm+level):
                print level, " has ", perm, " permission"
            else:
                print level, " does NOT have ", perm, "permission"
    

-- 
Steven


From anand.shashwat at gmail.com  Fri Mar  5 06:54:19 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Fri, 5 Mar 2010 17:24:19 +0530
Subject: Selecting MAX from a list
In-Reply-To: <loom.20100305T123510-94@post.gmane.org>
References: <loom.20100305T123510-94@post.gmane.org>
Message-ID: <d4ab53de1003050354t5e252c24x4ce982e836abffdf@mail.gmail.com>

On Fri, Mar 5, 2010 at 5:09 PM, Ines T <azt113 at gmail.com> wrote:

> I need to select a maximum number from a list


use max()


> and then call the variable that
> identifies that number, for example:
> x1,x2=1, y1,y2=4, z1,z2=3
>

you mean x1 = y1 = 1 or x1, y1 = 1, 1 right ?


> So I need first to find 4 and then to take y to do additional operations as
> y-z.
>

Well, I guess you got the idea


> I will appreciate your SOON help!
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From mrkafk at gmail.com  Fri Mar  5 06:56:34 2010
From: mrkafk at gmail.com (mk)
Date: Fri, 05 Mar 2010 12:56:34 +0100
Subject: NoSQL Movement?
In-Reply-To: <4b90e2d0$0$10096$426a34cc@news.free.fr>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>	<mailman.256.1267655008.23598.python-list@python.org>	<BABjn.11012$pv.4575@news-server.bigpond.net.au>	<mailman.270.1267671204.23598.python-list@python.org>
	<4b90e2d0$0$10096$426a34cc@news.free.fr>
Message-ID: <hmqrhh$l1o$1@dough.gmane.org>

Bruno Desthuilliers wrote:
>> Well, Zope is backed by an object database rather than a relational one.
> 
> And it ended up being a *major* PITA on all Zope projects I've worked on...

Care to write a few sentences on nature of problems with zodb? I was 
flirting with the thought of using it on some project.

Regards,
mk



From clp2 at rebertia.com  Fri Mar  5 07:01:32 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 5 Mar 2010 04:01:32 -0800
Subject: Proper way to return an instance of a class from a class method ?
In-Reply-To: <918065.487.qm@web23104.mail.ird.yahoo.com>
References: <918065.487.qm@web23104.mail.ird.yahoo.com>
Message-ID: <50697b2c1003050401h466d7f36t63b5f713d5271e4f@mail.gmail.com>

On Fri, Mar 5, 2010 at 2:35 AM, Aur? Gourrier
<aurelien.gourrier at yahoo.fr> wrote:
<snip>
> QUESTION 2:
> If I go this way, I have a second problem: if I create a new class which
> inherits from the previous, I would expect/like the methods from the initial
> class to return instances from the new class:
>
> class MyClass2(MyClass):
>
> ??? def othermethods(self):
> ??? ??? return MyClass2(whatever)
>
> Then I get:
>
> x = list1
> y = list2
> data = MyClass2([x,y])
> finaldata = data.transformdata()
>
> My problem is that finaldata is (of course) an instance of MyClass and not
> MyClass2. How do I deal with this ?

Get the object's actual class at runtime and use that.

#in MyClass
def transformdata(self):
    newdata = transform(data)
    return self.__class__(newdata)

When called on an instance of the subclass, self.__class__ will be
MyClass2 and everything will work out.

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


From bruno.42.desthuilliers at websiteburo.invalid  Fri Mar  5 07:15:59 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 05 Mar 2010 13:15:59 +0100
Subject: Method / Functions - What are the differences?
In-Reply-To: <4b902338$0$31260$607ed4bc@cv.net>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
	<mailman.109.1267539415.23598.python-list@python.org>
	<hmk1mn$70u$1@newsreader3.netcologne.de>
	<4b8e4041$0$17447$426a34cc@news.free.fr>
	<hmlte9$d0f$1@dough.gmane.org>
	<mailman.205.1267633968.23598.python-list@python.org>
	<4b8e9660$0$21812$426a34cc@news.free.fr>
	<hmmrh4$644$1@newsreader3.netcologne.de>
	<4B8EF717.3070701@optimum.net> <4b902338$0$31260$607ed4bc@cv.net>
Message-ID: <4b90f5eb$0$9148$426a74cc@news.free.fr>

John Posner a ?crit :
> On 3/3/2010 6:56 PM, John Posner wrote:
>>
>> ... I was thinking
>> today about "doing a Bruno", and producing similar pieces on:
>>
>> * properties created with the @property decorator
>>
>> * the descriptor protocol
>>
>> I'll try to produce something over the next couple of days.
>>
> 
> Starting to think about a writeup on Python properties, I've discovered 
> that the official Glossary [1] lacks an entry for "property" -- it's 
> missing in both Py2 and Py3!
> 
> Here's a somewhat long-winded definition -- comments, please:
> 
> ---------------------------------------------
> An attribute, *a*, of an object, *obj*, is said to be implemented as a 
> property if the standard ways of accessing the attribute:
> 
>  * evaluation:      print obj.a
>  * assignment:      obj.a = 42
>  * deletion:        del obj.a
> 
> ... cause methods of a user-defined *property object* to be invoked.

Hmmm... a couple remarks:

1/ "property" is actually the name of a Python builtin type. It's also 
pretty much used in general OO litterature for what we name 
"attributes". So  I think it would be better to avoid confusion between 
"property" as the builtin type, "property" as synonym for attribute, and 
"property" as the more specific concept of "computed attribute" - which 
is what you're describing here.

As far as I'm concerned, I prefer to stick to "computed attribute" for 
the generic case, and only use "property" when the computed attribute is 
actually implemented using the builtin property type.

2/ depending on how the computed attribute is implemented, the 
computation needs not happen on ALL get/set/del access - you can have 
non-binding descriptors (that is, not implementing __set__).

Also, the "standard" access also include getattr(), setattr() and 
delattr() (might be worth a note).

> The 
> attribute 

/attribute/user-defined object/ here ?

> is created as a class attribute, not an instance attribute. 
> Example:
> 
>   class Widget:
>       # create "color" as class attribute, not within __init__()
>       color = <<property-object>>
> 
>       def __init__(self, ...):
>           # do not define "self.color" instance attribute

Yes you can, and it's even actually pretty common:

# example.py
from somewhere import RGBColor

class Foo(object):
    def _get_color(self):
        return str(self._color)
    def _set_color(self, val):
        self._color = RGBColor.from_string(val)
    color = property(fget=_get_color, fset=_set_color)

    def __init__(self, colorvalue):
        self.color = colorvalue


> The property object can be created with the built-in function 
> property(), 

It's actually a type, not a function.

> which in some cases can be coded as a decorator: @property. 
> The property object can also be an instance of a class that implements 
> the descriptor protocol.

The "property object" IS an instance of a class that implements the 
descriptor protocol. The property type is just a "generic" descriptor:

# naive (and incomplete) python implementation of the property type

class property(object):
     def __init__(self, fget, fset=None, fdel=None)
         self._fget = fget
         self._fset = fset
         self._fdel = fdel

    def __get__(self, instance, cls):
        if instance is None:
            return self
        return self._fget(instance)

    def __set__(self, instance, value):
        if not self._fset:
            raise AttributeError("can't set attribute")
        self._fset(instance, value)

    def __del__(self):
        if not self._fdel:
            raise AttributeError("can't delete attribute")
        self._fdel(instance)


As far as I'm concerned, I'd "plan" such a paper as:

"""
What's a property ? It's a computed attribute implemented using the 
builtin "property" type.

Ok, so far it doesn't help much. So
1/ what's a computed attribute, and
2/ what is the property type ?

1/ your above explanation about what's a computed attribute in general, 
then a brief explanation of how computed attributes are implemented in 
python -> IOW, the descriptor protocol

2/ my above snippet !-)

"""

I think the way you started explaining computed attributes wrt/ 
attribute access could be a pretty good way to explain the descriptor 
protocol, since the mapping from get/set/del access to __get__, __set__, 
and __del__ magic methods is then pretty obvious.

But YMMV of course, so by all mean feel free to discard all or parts of 
the above remarks !-)

HTH


From lbolla at gmail.com  Fri Mar  5 07:19:23 2010
From: lbolla at gmail.com (lbolla)
Date: Fri, 5 Mar 2010 04:19:23 -0800 (PST)
Subject: SOAP 1.2 Python client ?
References: <5a36bd30-6cbd-48ca-9ca3-dc34c97e03c0@o30g2000yqb.googlegroups.com>
	<mailman.227.1267644925.23598.python-list@python.org>
	<fcaa9201-5e94-4cf3-af6e-78c1bbcb6144@t20g2000yqe.googlegroups.com>
Message-ID: <13753751-d0af-48df-b78d-5b371109e05c@t41g2000yqt.googlegroups.com>

On Mar 5, 10:01?am, BlueBird <p... at freehackers.org> wrote:
> On 3 mar, 20:35, Stefan Behnel <stefan... at behnel.de> wrote:
>
> > BlueBird, 03.03.2010 17:32:
>
> > > I am looking for a SOAP 1.2 python client. To my surprise, it seems
> > > that this does not exist. Does anybody know about this ?
>
> > SOAP may be an overly bloated protocol, but it's certainly not black magic.
> > It's not hard to do manually if you really need to:
>
> >http://effbot.org/zone/element-soap.htm
>
> But this requires a goog knowloedge of SOAP, in order to parse
> everything correctly. The reason I want to use a ready-made client is
> that I have about zero knowledge about SOAP, and even more in the
> differences between SOAP 1.1 and 1.2 .
>
> cheers,
>
> Philippe


I use a thin custom-made python wrapper around gSoap[1], which is tens
of times faster than ZSI.
L.


[1] http://www.cs.fsu.edu/~engelen/soapdoc2.html


From jeanmichel at sequans.com  Fri Mar  5 07:20:04 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 05 Mar 2010 13:20:04 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <hmpu64$us8$1@dough.gmane.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>	<hmokot$uso$1@news.eternal-september.org>	<mailman.293.1267718664.23598.python-list@python.org>	<hmop33$rrj$1@news.eternal-september.org>	<mailman.303.1267723835.23598.python-list@python.org>	<6af3c613-3439-484b-83f1-49213f1ed574@k17g2000yqb.googlegroups.com>
	<hmpu64$us8$1@dough.gmane.org>
Message-ID: <4B90F6F4.5010202@sequans.com>

Robert Kern wrote:
> On 2010-03-04 15:12 , Mike Kent wrote:
>> On Mar 4, 12:30 pm, Robert Kern<robert.k... at gmail.com>  wrote:
>>
>>> He's ignorant of the use cases of the with: statement, true.
>>
>> <humor>  Ouch!  Ignorant of the use cases of the with statement, am I?
>> Odd, I use it all the time.</humor>
>
> No, I was referring to Jean-Michel, who was not familiar with the 
> with: statement.
>
>>> Given only your
>>> example of the with: statement, it is hard to fault him for thinking 
>>> that try:
>>> finally: wouldn't suffice.
>>
>> <humor>  Damn me with faint praise, will you?</humor>
>
> Also talking about Jean-Michel. :-)
>
I confirm, I am the ignoramus (what a strange word) in this story :-)

JM


From lbolla at gmail.com  Fri Mar  5 07:24:51 2010
From: lbolla at gmail.com (lbolla)
Date: Fri, 5 Mar 2010 04:24:51 -0800 (PST)
Subject: Selecting MAX from a list
References: <mailman.339.1267789512.23598.python-list@python.org>
Message-ID: <e49e1254-8c30-4fb4-82bf-e7ff9f664441@d2g2000yqa.googlegroups.com>

On Mar 5, 11:39?am, Ines T <azt... at gmail.com> wrote:
> I need to select a maximum number from a list and then call the variable that
> identifies that number, for example:
> x1,x2=1, y1,y2=4, z1,z2=3
> So I need first to find 4 and then to take y to do additional operations as y-z.

It's not clear what you are supposed to do, but wouldn't a combination
of "max" and "index" do?
x = [3,2,1,4,5,2,3]
max(x) # 5
x.index(5) # 4

> I will appreciate your SOON help!
And, by the way, politeness is free!


From alfps at start.no  Fri Mar  5 08:06:55 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Fri, 05 Mar 2010 14:06:55 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.331.1267778428.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>	<hmn03d$5r6$1@news.eternal-september.org>	<mailman.292.1267717742.23598.python-list@python.org>	<hmooo6$pg0$1@news.eternal-september.org>	<mailman.300.1267723245.23598.python-list@python.org>	<hmoul7$2i9$1@news.eternal-september.org>	<mailman.314.1267744631.23598.python-list@python.org>	<hmph3b$20o$1@news.eternal-september.org>
	<mailman.331.1267778428.23598.python-list@python.org>
Message-ID: <hmqvlk$j2i$1@news.eternal-september.org>

* Robert Kern:
> On 2010-03-04 17:52 , Alf P. Steinbach wrote:
>> * Robert Kern:
>>> On 2010-03-04 12:37 PM, Alf P. Steinbach wrote:
>>>> * Robert Kern:
>>>>> On 2010-03-04 10:56 AM, Alf P. Steinbach wrote:
>>>>>> * Robert Kern:
>>>>>>> On 2010-03-03 18:49 PM, Alf P. Steinbach wrote:
>>>> [snippety]
>>>>>>>
>>>>>>>> If you call the possibly failing operation "A", then that 
>>>>>>>> systematic
>>>>>>>> approach goes like this: if A fails, then it has cleaned up its own
>>>>>>>> mess, but if A succeeds, then it's the responsibility of the 
>>>>>>>> calling
>>>>>>>> code to clean up if the higher level (multiple statements) 
>>>>>>>> operation
>>>>>>>> that A is embedded in, fails.
>>>>>>>>
>>>>>>>> And that's what Marginean's original C++ ScopeGuard was designed
>>>>>>>> for,
>>>>>>>> and what the corresponding Python Cleanup class is designed for.
>>>>>>>
>>>>>>> And try: finally:, for that matter.
>>>>>>
>>>>>> Not to mention "with".
>>>>>>
>>>>>> Some other poster made the same error recently in this thread; it 
>>>>>> is a
>>>>>> common fallacy in discussions about programming, to assume that since
>>>>>> the same can be expressed using lower level constructs, those are all
>>>>>> that are required.
>>>>>>
>>>>>> If adopted as true it ultimately means the removal of all control
>>>>>> structures above the level of "if" and "goto" (except Python doesn't
>>>>>> have "goto").
>>>>>
>>>>> What I'm trying to explain is that the with: statement has a use even
>>>>> if Cleanup doesn't. Arguing that Cleanup doesn't improve on try:
>>>>> finally: does not mean that the with: statement doesn't improve on
>>>>> try: finally:.
>>>>
>>>> That's a different argument, essentially that you see no advantage for
>>>> your current coding patterns.
>>>>
>>>> It's unconnected to the argument I responded to.
>>>>
>>>> The argument that I responded to, that the possibility of expressing
>>>> things at the level of try:finally: means that a higher level construct
>>>> is superfluous, is still meaningless.
>>>
>>> I am attacking your premise that the "with Cleanup():" construct is
>>> higher level than try: finally:. It isn't. It provides the same level
>>> of abstraction as try: finally:.
>>>
>>> This is distinct from the accepted uses of the with: statement which
>>> *are* higher level than try: finally: and which do confer practical
>>> benefits over using try: finally: despite being syntactical sugar for
>>> try: finally:.
>>>
>>>>>>>>> Both formulations can be correct (and both work perfectly fine 
>>>>>>>>> with
>>>>>>>>> the chdir() example being used). Sometimes one is better than the
>>>>>>>>> other, and sometimes not. You can achieve both ways with either
>>>>>>>>> your
>>>>>>>>> Cleanup class or with try: finally:.
>>>>>>>>>
>>>>>>>>> I am still of the opinion that Cleanup is not an improvement over
>>>>>>>>> try:
>>>>>>>>> finally: and has the significant ugliness of forcing cleanup code
>>>>>>>>> into
>>>>>>>>> callables. This significantly limits what you can do in your
>>>>>>>>> cleanup
>>>>>>>>> code.
>>>>>>>>
>>>>>>>> Uhm, not really. :-) As I see it.
>>>>>>>
>>>>>>> Well, not being able to affect the namespace is a significant
>>>>>>> limitation. Sometimes you need to delete objects from the
>>>>>>> namespace in
>>>>>>> order to ensure that their refcounts go to zero and their cleanup
>>>>>>> code
>>>>>>> gets executed.
>>>>>>
>>>>>> Just a nit (I agree that a lambda can't do this, but as to what's
>>>>>> required): assigning None is sufficient for that[1].
>>>>>
>>>>> Yes, but no callable is going to allow you to assign None to names in
>>>>> that namespace, either. Not without sys._getframe() hackery, in any
>>>>> case.
>>>>>
>>>>>> However, note that the current language doesn't guarantee such
>>>>>> cleanup,
>>>>>> at least as far as I know.
>>>>>>
>>>>>> So while it's good practice to support it, to do everything to let it
>>>>>> happen, it's presumably bad practice to rely on it happening.
>>>>>>
>>>>>>
>>>>>>> Tracebacks will keep the namespace alive and all objects in it.
>>>>>>
>>>>>> Thanks!, I hadn't thought of connecting that to general cleanup
>>>>>> actions.
>>>>>>
>>>>>> It limits the use of general "with" in the same way.
>>>>>
>>>>> Not really.
>>>>
>>>> Sorry, it limits general 'with' in /exactly/ the same way.
>>>>
>>>>> It's easy to write context managers that do that [delete objects from
>>>>> the namespace].
>>>>
>>>> Sorry, no can do, as far as I know; your following example quoted below
>>>> is an example of /something else/.
>>>
>>> Okay, so what do you mean by 'the use of general "with"'? I'm talking
>>> about writing a context manager or using the @contextmanager decorator
>>> to do some initialization and then later cleaning up that
>>> initialization. That cleaning up may entail deleting an object. You
>>> are correct that the context manager can't affect the namespace of the
>>> with: clause, but that's not the initialization that it would need to
>>> clean up.
>>>
>>> Yes, you can write code with a with: statement where you try to clean
>>> up stuff that happened inside of the clause (you did), but that's not
>>> how the with: statement was ever intended to be used nor is it good
>>> practice to do so because of that limitation. Context managers are
>>> designed to initialize specific things, then clean them up. I thought
>>> you were talking about the uses of the with: statement as described in
>>> PEP-343, not every possible misuse of the with: statement.
>>
>> I'm not the one talking about removing variables or that "it's easy to
>> write context managers that do that".
>>
>> You are the one talking about that.
>>
>> So I have really not much to add.
>>
>> It seems that you're now agreeing with me that former is not good
>> practice and that the latter is impossible to do portably, but you now
>> argue against your earlier stand as if that was something that I had put
>> forward.
> 
> No, I'm still saying that sometimes you do need to remove variables that 
> you initialized in the initialization section. Writing a purpose-built 
> context manager which encapsulates the initialization and finalization 
> allows you to do this easily. Putting the initialization section inside 
> the with: clause, as you do, and requiring cleanup code to be put into 
> callables makes this hard.
> 
>> It's a bit confusing when you argue against your own statements.
>>
>>>> And adding on top of irrelevancy, for the pure technical aspect it can
>>>> be accomplished in the same way using Cleanup (I provide an example
>>>> below).
>>>>
>>>> However, doing that would generally be worse than pointless since with
>>>> good coding practices the objects would become unreferenced anyway.
>>>>
>>>>
>>>>> You put the initialization code in the __enter__() method, assign
>>>>> whatever objects you want to keep around through the with: clause as
>>>>> attributes on the manager, then delete those attributes in the
>>>>> __exit__().
>>>>
>>>> Analogously, if one were to do this thing, then it could be 
>>>> accomplished
>>>> using a Cleanup context manager as follows:
>>>>
>>>> foo = lambda: None
>>>> foo.x = create_some_object()
>>>> at_cleanup.call( lambda o = foo: delattr( o, "x" ) )
>>>>
>>>> ... except that
>>>>
>>>> 1) for a once-only case this is less code :-)
>>>
>>> Not compared to a try: finally:, it isn't.
>>
>> Again, this context shifting is bewildering. As you can see, quoted
>> above, you were talking about a situation where you would have defined a
>> context manager, presumably because a 'try' would not in your opinion be
>> simpler for whatever it was that you had in mind. But you are responding
>> to the code I offered as if it was an alternative to something where you
>> would find a 'try' to be simplest.
> 
> I have consistently put forward that for once-only cases, try: finally: 
> is a preferable construct to "with Cleanup():". I also put forward that 
> for repetitive cases, a purpose-built context manager is preferable. I 
> note that for both try: finally: and a purpose-built context manager, 
> modifying the namespace is easy to do while it is difficult and less 
> readable to do with "with Cleanup():". Since you were claiming that the 
> "generic with:" would have the same problem as "with Cleanup():" I was 
> trying to explain for why all of the intended use cases of the with: 
> statement (the purpose-built context managers), there is no problem. 
> Capisce?
> 
>>>> 2) it is a usage that I wouldn't recommend; instead I recommend 
>>>> adopting
>>>> good
>>>> coding practices where object references aren't kept around.
>>>
>>> Many of the use cases of the with: statement involve creating an
>>> object (like a lock or a transaction object), keeping it around for
>>> the duration of the "# Do stuff" block, and then finalizing it.
>>>
>>>>> Or, you use the @contextmanager decorator to turn a generator into a
>>>>> context manager, and you just assign to local variables and del them
>>>>> in the finally: clause.
>>>>
>>>> Uhm, you don't need a 'finally' clause when you define a context
>>>> manager.
>>>
>>> When you use the @contextmanager decorator, you almost always do. See
>>> the Examples section of PEP 343:
>>>
>>> http://www.python.org/dev/peps/pep-0343/
>>>
>>>> Additionally, you don't need to 'del' the local variables in
>>>> @contextmanager decorated generator.
>>>>
>>>> The local variables cease to exist automatically.
>>>
>>> True.
>>>
>>>>> What you can't do is write a generic context manager where the
>>>>> initialization happens inside the with: clause and the cleanup actions
>>>>> are registered callables. That does not allow you to affect the
>>>>> namespace.
>>>>
>>>> If you mean that you can't introduce direct local variables and have
>>>> them deleted by "registered callables" in a portable way, then right.
>>>>
>>>> But I can't think of any example where that would be relevant; in
>>>> particular what matters for supporting on-destruction cleanup is 
>>>> whether
>>>> you keep any references or not, not whether you have a local 
>>>> variable of
>>>> any given name.
>>>
>>> Well, local variables keep references to objects. Variable assignment
>>> followed by deletion is a very readable way to keep an object around
>>> for a while then remove it later. If you have to go through less
>>> readable contortions to keep the object around when it needs to be and
>>> clean it up later, then that is a mark against your approach.
>>
>> Sorry, as with the places noted above, I can't understand what you're
>> trying to say here. I don't recommend coding practices where you keep
>> object references around,
> 
> Then how do you clean up locks and transaction objects and similar 
> things if you don't keep them around during the code suite? Creating an 
> object, keeping it around while executing a specific chunk of code, and 
> finalizing it safely is a prime use case for these kinds of constructs.

Where you need a scope, create a scope.

That is, put the logic in a routine.

However, most objects aren't of the sort the requiring to become unreferenced. 
Those that require cleanup can be cleaned up and left as zombies, like calling 
'close' on a file. And so in the general case what you're discussing, how to get 
rid of object references, is a non-issue  --  irrelevant.


>> and you have twice quoted that above. I don't
>> have any clue what "contortions" you are talking about, it must be
>> something that you imagine.
> 
> These are the contortions:
> 
>   foo = lambda: None
>   foo.x = create_some_object()
>   at_cleanup.call( lambda o = foo: delattr( o, "x" ) )

That's code that demonstrates something very different, in response to your 
description of doing this.

Since I half suspected that it could be taken out of context I followed that 
immediately with

<quote>
   2) it is a usage that I wouldn't recommend; instead I recommend adopting
      good coding practices where object references aren't kept around.
</quote>

I'm sorry but I don't know how to make that more clear.


Cheers & hth.,

- Alf


From alfps at start.no  Fri Mar  5 08:09:08 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Fri, 05 Mar 2010 14:09:08 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.326.1267777257.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.277.1267699818.23598.python-list@python.org>	<hmokot$uso$1@news.eternal-september.org>	<mailman.293.1267718664.23598.python-list@python.org>	<hmop33$rrj$1@news.eternal-september.org>	<mailman.303.1267723835.23598.python-list@python.org>	<6af3c613-3439-484b-83f1-49213f1ed574@k17g2000yqb.googlegroups.com>	<hmpc3r$2il$1@news.eternal-september.org>
	<mailman.326.1267777257.23598.python-list@python.org>
Message-ID: <hmqvpn$j2i$2@news.eternal-september.org>

* Robert Kern:
> On 2010-03-04 16:27 , Alf P. Steinbach wrote:
>> * Mike Kent:
> 
>>> However, I fail to understand his response that I must have meant try/
>>> else instead, as this, as Mr. Kern pointed out, is invalid syntax.
>>> Perhaps Mr. Steinbach would like to give an example?
>>
>> OK.
>>
>> Assuming that you wanted the chdir to be within a try block (which it
>> was in your code), then to get code equivalent to my code, for the
>> purpose of a comparision of codes that do the same, you'd have to write
>> something like ...
>>
>> original_dir = os.getcwd()
>> try:
>> os.chdir(somewhere)
>> except Whatever:
>> # E.g. log it.
>> raise
>> else:
>> try:
>> # Do other stuff
>> finally:
>> os.chdir(original_dir)
>> # Do other cleanup
>>
>> ... which would be a more general case.
>>
>> I've also given this example in response to Robert earlier in the
>> thread. Although I haven't tried it I believe it's syntactically valid.
>> If not, then the relevant typo should just be fixed. :-)
>>
>> I have no idea which construct Robert thought was syntactically invalid.
>> I think that if he's written that, then it must have been something he
>> thought of.
> 
> I was just trying to interpret what you meant by "Changing 'finally' to 
> 'else' could make it equivalent."

Oh yes, in the article where I gave the example of that, shown above.

Hey, discussing previous discussion is silly.


Cheers,

- ALf


From mrkafk at gmail.com  Fri Mar  5 08:26:13 2010
From: mrkafk at gmail.com (mk)
Date: Fri, 05 Mar 2010 14:26:13 +0100
Subject: loop over list and process into groups
In-Reply-To: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>
References: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>
Message-ID: <4B910675.60909@gmail.com>

Sneaky Wombat wrote:
> [ 'VLAN4065',
>  'Interface',
>  'Gi9/6',
>  'Po2',
>  'Po3',
>  'Po306',
>  'VLAN4068',
>  'Interface',
>  'Gi9/6',
>  'VLAN4069',
>  'Interface',
>  'Gi9/6',]

Hey, I just invented a cute ;-) two-liner using list comprehensions:

# alist = list above

tmp, dk = [], {}
[(x.startswith('VLAN') and (dk.setdefault(x,[]) or tmp.append(x))) or 
(not x.startswith('VLAN') and dk[tmp[-1]].append(x))    for x in alist 
if x != 'Interface']

No need to use a nuke like itertools to kill a fly. ;-)

Regards,
mk



From raghavendra.gv.vanam at gmail.com  Fri Mar  5 08:32:21 2010
From: raghavendra.gv.vanam at gmail.com (vanam)
Date: Fri, 5 Mar 2010 05:32:21 -0800 (PST)
Subject: process mp3 file
References: <6fc7b483-c9a9-4581-991c-f816a2701526@g8g2000pri.googlegroups.com>
	<mailman.173.1267611946.23598.python-list@python.org>
	<9ab3890c-14b9-4031-96c1-6f991469c9ae@m35g2000prh.googlegroups.com>
Message-ID: <e6ebc773-e837-4b61-ab51-cb7432aaca0e@b7g2000pro.googlegroups.com>

On Mar 3, 3:43?pm, asit <lipu... at gmail.com> wrote:
> > Define "processing".
>
> getting the title, song name, etc of the file and updating in a
> database

Other possibility can be passing out the extension of the file and
directory where
the files are present, using os.walk we can extract the file name by
filtering the .mp3 extension.


From duncan.booth at invalid.invalid  Fri Mar  5 08:38:51 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 5 Mar 2010 13:38:51 GMT
Subject: Evaluate my first python script, please
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
	<mailman.338.1267785907.23598.python-list@python.org>
Message-ID: <Xns9D328A6F02AB0duncanbooth@127.0.0.1>

Jean-Michel Pichavant <jeanmichel at sequans.com> wrote:

> You've already been given good advices.
> Unlike some of those, I don't think using regexp an issue in any way. 
> Yes they are not readable, for sure, I 100% agree to that statement, but 
> you can make them readable very easily.
> 
> # not readable
> match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line)
> 
> 
> # readable
> match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line) # match 
> '192.168.200.1   (foo123)'
> 
> I gladly understand ppl that are not willing to use regexp (or as last 
> resort), but for a perl guy, that should not be an issue.

The problem with your comment is that just by existing it means people will 
be misled into thinking the regex is being used to match strings like
  '192.168.200.1   (foo123)'
when in fact the OP is expecting to match strings like
  '192.168.200.1   foo123'

i.e. you may mislead some people into thinking the parentheses are part of 
what is being matched when they're actually grouping within the regex.

Another problem with either regular expression line is that it makes it 
less easy to see that it doesn't do what the OP wanted. /etc/hosts contains  
lines with an IP address followed by multiple hostnames. It may also 
contain comments either as complete lines or at the end of lines. The code 
given will miss hostnames after the first and will include hostnames in 
commented out lines.

-- 
Duncan Booth http://kupuguy.blogspot.com


From mehgcap at gmail.com  Fri Mar  5 08:41:37 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Fri, 5 Mar 2010 08:41:37 -0500
Subject: python on a thumb drive?
Message-ID: <bc7f680c1003050541i18e96389pb8474ae272a2d930@mail.gmail.com>

Hello all,
My name is Alex. I am pretty new to Python, but I really like it.

I am trying to put my python and pythonw executables on my thumb
drive, along with packages, using Moveable Python, but I cannot figure
out how to run scripts using it. I would rather use a shell than the
script runner gui since it does not seem to work. Any suggestions?
Thanks!

-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From jeanmichel at sequans.com  Fri Mar  5 09:28:49 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 05 Mar 2010 15:28:49 +0100
Subject: Evaluate my first python script, please
In-Reply-To: <Xns9D328A6F02AB0duncanbooth@127.0.0.1>
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>	<mailman.338.1267785907.23598.python-list@python.org>
	<Xns9D328A6F02AB0duncanbooth@127.0.0.1>
Message-ID: <4B911521.20302@sequans.com>

Duncan Booth wrote:
> Jean-Michel Pichavant <jeanmichel at sequans.com> wrote:
>
>   
>> You've already been given good advices.
>> Unlike some of those, I don't think using regexp an issue in any way. 
>> Yes they are not readable, for sure, I 100% agree to that statement, but 
>> you can make them readable very easily.
>>
>> # not readable
>> match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line)
>>
>>
>> # readable
>> match = re.search('\d+\.\d+\.\d+\.\d+\s+(\S+)', line) # match 
>> '192.168.200.1   (foo123)'
>>
>> I gladly understand ppl that are not willing to use regexp (or as last 
>> resort), but for a perl guy, that should not be an issue.
>>     
>
> The problem with your comment is that just by existing it means people will 
> be misled into thinking the regex is being used to match strings like
>   '192.168.200.1   (foo123)'
> when in fact the OP is expecting to match strings like
>   '192.168.200.1   foo123'
>
> i.e. you may mislead some people into thinking the parentheses are part of 
> what is being matched when they're actually grouping within the regex.
>
> Another problem with either regular expression line is that it makes it 
> less easy to see that it doesn't do what the OP wanted. /etc/hosts contains  
> lines with an IP address followed by multiple hostnames. It may also 
> contain comments either as complete lines or at the end of lines. The code 
> given will miss hostnames after the first and will include hostnames in 
> commented out lines.
>
>   
And tell me how not using regexp will ensure the /etc/hosts processing 
is correct ? The non regexp solutions provided in this thread did not 
handled what you rightfully pointed out about host list and commented lines.

And FYI, the OP pattern does match '192.168.200.1 (foo123)'
...
Ok that's totally unfair :D You're right I made a mistake.  Still the 
comment is absolutely required (provided it's correct).

JM


From jpiitula at ling.helsinki.fi  Fri Mar  5 09:43:47 2010
From: jpiitula at ling.helsinki.fi (Jussi Piitulainen)
Date: 05 Mar 2010 16:43:47 +0200
Subject: Partly erratic wrong behaviour, Python 3, lxml
References: <qotr5o0xt3l.fsf@ruuvi.it.helsinki.fi>
	<mailman.308.1267729874.23598.python-list@python.org>
	<qotlje7ydd4.fsf@ruuvi.it.helsinki.fi>
	<mailman.333.1267778901.23598.python-list@python.org>
Message-ID: <qotbpf27rrw.fsf@ruuvi.it.helsinki.fi>

Stefan Behnel writes:
> Jussi Piitulainen, 04.03.2010 22:40:
> > Stefan Behnel writes:
> >> Jussi Piitulainen, 04.03.2010 11:46:
> >>> I am observing weird semi-erratic behaviour that involves Python 3
> >>> and lxml, is extremely sensitive to changes in the input data, and
> >>> only occurs when I name a partial result. I would like some help
> >>> with this, please. (Python 3.1.1; GNU/Linux; how do I find lxml
> >>> version?)
> >>
> >> Here's how to find the version:
> >>
> >> http://codespeak.net/lxml/FAQ.html#i-think-i-have-found-a-bug-in-lxml-what-should-i-do
> >
> > Ok, thank you. Here's the results:
> >
> > >>> print(et.LXML_VERSION, et.LIBXML_VERSION,
> > ...       et.LIBXML_COMPILED_VERSION, et.LIBXSLT_VERSION,
> > ...       et.LIBXSLT_COMPILED_VERSION)
> > (2, 2, 4, 0) (2, 6, 26) (2, 6, 26) (1, 1, 17) (1, 1, 17)
> 
> I can't reproduce this with the latest lxml trunk (and Py3.2 trunk)
> and libxml2 2.7.6, even after running your test script for quite a
> while. I'd try to upgrade the libxml2 version.

Thank you much. I suppose that is good news. It's a big server with
many users - I will ask the administrators to consider an upgrade when
I get around to it.

Turns out that lxml documentation warns not to use libxml2 version
2.6.27 if I want to use xpath, and that is just a bit newer than we
have. On that cue, I seem to have found a workaround: I replaced the
xpath expression with findall(titlef) where

    titlef = ( '//{http://www.openarchives.org/OAI/2.0/}record'
               '//{http://purl.org/dc/elements/1.1}title' )

In the previously broken naming() function I now have:

        result = etree.parse(BytesIO(body))
        n = len(result.findall(titlef))

And in the previously working nesting() function:

        n = len(etree.parse(BytesIO(body)).findall(titlef))

With these changes, the test script gives consistently the result that
I expect, and the more complicated real test script where I first met
the problem also appears to work without a hitch. So, this works.

The other, broken behaviour is totally scary, though.


From duncan.booth at invalid.invalid  Fri Mar  5 10:00:07 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 5 Mar 2010 15:00:07 GMT
Subject: Evaluate my first python script, please
References: <Xns9D328A6F02AB0duncanbooth@127.0.0.1>
	<mailman.350.1267799340.23598.python-list@python.org>
Message-ID: <Xns9D32973F91EA1duncanbooth@127.0.0.1>

Jean-Michel Pichavant <jeanmichel at sequans.com> wrote:

> And tell me how not using regexp will ensure the /etc/hosts processing
> is correct ? The non regexp solutions provided in this thread did not 
> handled what you rightfully pointed out about host list and commented
> lines. 

It won't make is automatically correct, but I'd guess that written without 
being so dependent on regexes might have made someone point out those 
deficiencies sooner. The point being that casual readers of the code won't 
take the time to decode the regex, they'll glance over it and assume it 
does something or other sensible.

If I was writing that code, I'd read each line, strip off comments and 
leading whitespace (so you can use re.match instead of re.search), split on 
whitespace and take all but the first field. I might check that the field 
I'm ignoring it something like a numeric ip address, but if I did want to 
do then I'd include range checking for valid octets so still no regex.

The whole of that I'd wrap in a generator so what you get back is a 
sequence of host names.

However that's just me. I'm not averse to regular expressions, I've written 
some real mammoths from time to time, but I do avoid them when there are 
simpler clearer alternatives.

> And FYI, the OP pattern does match '192.168.200.1 (foo123)'
> ...
> Ok that's totally unfair :D You're right I made a mistake.  Still the 
> comment is absolutely required (provided it's correct).
> 
Yes, the comment would have been good had it been correct. I'd also go for 
a named group as that provides additional context within the regex.

Also if there are several similar regular expressions in the code, or if 
they get too complex I'd build them up in parts. e.g.

OCTET = r'(?:\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])'
ADDRESS = (OCTET + r'\.') * 3 + OCTET
HOSTNAME = r'[-a-zA-Z0-9]+(?:\.[-a-zA-Z0-9]+)*'
  # could use \S+ but my Linux manual says
  # alphanumeric, dash and dots only
... and so on ...

which provides another way of documenting the intentions of the regex.

BTW, I'm not advocating that here, the above patterns would be overkill, 
but in more complex situations thats what I'd do.

-- 
Duncan Booth http://kupuguy.blogspot.com


From jjposner at optimum.net  Fri Mar  5 10:10:51 2010
From: jjposner at optimum.net (John Posner)
Date: Fri, 05 Mar 2010 10:10:51 -0500
Subject: Method / Functions - What are the differences?
In-Reply-To: <4b90f5eb$0$9148$426a74cc@news.free.fr>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
	<mailman.109.1267539415.23598.python-list@python.org>
	<hmk1mn$70u$1@newsreader3.netcologne.de>
	<4b8e4041$0$17447$426a34cc@news.free.fr>
	<hmlte9$d0f$1@dough.gmane.org>
	<mailman.205.1267633968.23598.python-list@python.org>
	<4b8e9660$0$21812$426a34cc@news.free.fr>
	<hmmrh4$644$1@newsreader3.netcologne.de>
	<4B8EF717.3070701@optimum.net> <4b902338$0$31260$607ed4bc@cv.net>
	<4b90f5eb$0$9148$426a74cc@news.free.fr>
Message-ID: <4b911ee0$0$4988$607ed4bc@cv.net>

On 3/5/2010 7:15 AM, Bruno Desthuilliers wrote:
> John Posner a ?crit :
>> On 3/3/2010 6:56 PM, John Posner wrote:
>>>
>>> ... I was thinking
>>> today about "doing a Bruno", and producing similar pieces on:
>>>
>>> * properties created with the @property decorator
>>>
>>> * the descriptor protocol
>>>
>>> I'll try to produce something over the next couple of days.
>>>
>>
>> Starting to think about a writeup on Python properties, I've
>> discovered that the official Glossary [1] lacks an entry for
>> "property" -- it's missing in both Py2 and Py3!
>>
>> Here's a somewhat long-winded definition -- comments, please:
>>
>> ---------------------------------------------
>> An attribute, *a*, of an object, *obj*, is said to be implemented as a
>> property if the standard ways of accessing the attribute:
>>
>> * evaluation: print obj.a
>> * assignment: obj.a = 42
>> * deletion: del obj.a
>>
>> ... cause methods of a user-defined *property object* to be invoked.
>
> Hmmm... a couple remarks:
>
> 1/ "property" is actually the name of a Python builtin type. It's also
> pretty much used in general OO litterature for what we name
> "attributes". So I think it would be better to avoid confusion between
> "property" as the builtin type, "property" as synonym for attribute, and
> "property" as the more specific concept of "computed attribute" - which
> is what you're describing here.
>
> As far as I'm concerned, I prefer to stick to "computed attribute" for
> the generic case, and only use "property" when the computed attribute is
> actually implemented using the builtin property type.

Yes, I had already decided that the first sentence of the glossary 
definition needs to be, "A property is a computed attribute".

>
> 2/ depending on how the computed attribute is implemented, the
> computation needs not happen on ALL get/set/del access - you can have
> non-binding descriptors (that is, not implementing __set__).

Yes, but IMHO that information belongs in the full writeup, not in the 
glossary definition. I've added the phrase "some or all" in the glossary 
definition (see below).

> Also, the "standard" access also include getattr(), setattr() and
> delattr() (might be worth a note).
>
>> The attribute
>
> /attribute/user-defined object/ here ?
>
>> is created as a class attribute, not an instance attribute. Example:
>>
>> class Widget:
>> # create "color" as class attribute, not within __init__()
>> color = <<property-object>>
>>
>> def __init__(self, ...):
>> # do not define "self.color" instance attribute
>
> Yes you can, and it's even actually pretty common:

Of course -- and I realize that I was introducing confusion, rather than 
enlightenment, with my example. I think the point is too subtle for a 
(necessarily short) glossary definition, so I'm removing the example 
from the definition.

>
> # example.py
> from somewhere import RGBColor
>
> class Foo(object):
> def _get_color(self):
> return str(self._color)
> def _set_color(self, val):
> self._color = RGBColor.from_string(val)
> color = property(fget=_get_color, fset=_set_color)
>
> def __init__(self, colorvalue):
> self.color = colorvalue

[OFF-TOPIC] Wow, Thunderbird 3.0.2 nuked the indentation in the code 
above. :-(

>
>
>> The property object can be created with the built-in function property(),
>
> It's actually a type, not a function.

Ah, yes. Thanks.

>
>> which in some cases can be coded as a decorator: @property. The
>> property object can also be an instance of a class that implements the
>> descriptor protocol.
>
> The "property object" IS an instance of a class that implements the
> descriptor protocol. The property type is just a "generic" descriptor:
>
> # naive (and incomplete) python implementation of the property type
>
> class property(object):
> def __init__(self, fget, fset=None, fdel=None)
> self._fget = fget
> self._fset = fset
> self._fdel = fdel
>
> def __get__(self, instance, cls):
> if instance is None:
> return self
> return self._fget(instance)
>
> def __set__(self, instance, value):
> if not self._fset:
> raise AttributeError("can't set attribute")
> self._fset(instance, value)
>
> def __del__(self):
> if not self._fdel:
> raise AttributeError("can't delete attribute")
> self._fdel(instance)

Good stuff for the full writeup on properties.


> As far as I'm concerned, I'd "plan" such a paper as:
>
> """
> What's a property ? It's a computed attribute implemented using the
> builtin "property" type.
>
> Ok, so far it doesn't help much. So
> 1/ what's a computed attribute, and
> 2/ what is the property type ?
>
> 1/ your above explanation about what's a computed attribute in general,
> then a brief explanation of how computed attributes are implemented in
> python -> IOW, the descriptor protocol
>
> 2/ my above snippet !-)

I agree. I'm not sure whether the "brief explanation of how computed 
attributes are implemented in Python" belongs in the *properties* 
writeup or the *descriptors* writeup. (I think they should be separate, 
to avoid making readers brains explode.) I'll make the (initial) call 
when/if I get that far!


>
> """
>
> I think the way you started explaining computed attributes wrt/
> attribute access could be a pretty good way to explain the descriptor
> protocol, since the mapping from get/set/del access to __get__, __set__,
> and __del__ magic methods is then pretty obvious.
>
> But YMMV of course, so by all mean feel free to discard all or parts of
> the above remarks !-)
>
> HTH


Here's my leaner, meaner glossary definition of *property*:

-------------------
A property is a computed attribute: an attribute, a, of an object, obj, 
is said to be implemented as a property if some or all of the standard 
ways of accessing the attribute:

  * evaluation:    result = obj.a
  * assignment:    obj.a = 42
  * deletion:      del obj.a

... cause methods of another user-defined object to be invoked. This 
other object can be an instance of the built-in type *property*, or as 
an instance of a class that implements the descriptor protocol.
-------------------

Many thanks, Bruno -- again!

-John


From J.Fine at open.ac.uk  Fri Mar  5 10:19:45 2010
From: J.Fine at open.ac.uk (Jonathan Fine)
Date: Fri, 05 Mar 2010 15:19:45 +0000
Subject: WANTED: A good name for the pair (args, kwargs)
In-Reply-To: <hmo94l$9hb$1@south.jnrs.ja.net>
References: <hmo94l$9hb$1@south.jnrs.ja.net>
Message-ID: <hmr7eh$3ar$1@south.jnrs.ja.net>

Jonathan Fine wrote:
> Hi
> 
> We can call a function fn using
>     val = fn(*args, **kwargs)
> 
> I'm looking for a good name for the pair (args, kwargs).  Any suggestions?
> 
> Here's my use case:
>     def doit(fn , wibble, expect):
>         args, kwargs = wibble
>         actual = fn(*args, **kwargs)
>         if actual != expect:
>             # Something has gone wrong.
>             pass
> 
> This is part of a test runner.
> 
> For now I'll use argpair, but if anyone has a better idea, I'll use it.

Thank you, Tim, Paul, Steve and Aahz for your suggestions.

I'm now preferring:

     def test_apply(object, argv, valv):
	
         args, kwargs = argv
         expect, exceptions = valv

         # Inside try: except:
         actual = object(*args, **kwargs)

         # Check against expect, exceptions.

best regards


Jonathan





From pemerson at gmail.com  Fri Mar  5 10:53:06 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 07:53:06 -0800 (PST)
Subject: Evaluate my first python script, please
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
	<mailman.335.1267780414.23598.python-list@python.org>
Message-ID: <75a58067-9554-496b-ba38-1a3a8023d866@w27g2000pre.googlegroups.com>

Thanks for your response, further questions inline.

On Mar 4, 11:07?am, Tim Wintle <tim.win... at teamrubber.com> wrote:
> On Thu, 2010-03-04 at 10:39 -0800, Pete Emerson wrote:
> > I am looking for advice along the lines of "an easier way to do this"
> > or "a more python way" (I'm sure that's asking for trouble!) or
> > "people commonly do this instead" or "here's a slick trick" or "oh,
> > interesting, here's my version to do the same thing".
>
> (1) I would wrap it all in a function
>
> def main():
> ? ? # your code here
>
> if __name__ == "__main__":
> ? ? main()

Is this purely aesthetic reasons, or will I appreciate this when I
write my own modules, or something else?

>
> (2) PEP8 (python style guidelines) suggests one import per line
>
> (3) I'd use four spaces as tab width
>
> (4)
> I'd change this:
>
> > ? ? for arg in sys.argv[1:]:
> > ? ? ? ? for section in hostname.split('.'):
> > ? ? ? ? ? ? if section == arg:
> > ? ? ? ? ? ? ? ? count = count + 1
> > ? ? ? ? ? ? ? ? break
>
> to something more like:
>
> ? ? for section in hostname.split("."):
> ? ? ? ? if section in sys.argv[1:]:
> ? ? ? ? ? ? count += 1

Ah, yes, I like that. It moves towards the set notation I've wound up
with. Definitely more readable to me.

>
> (although as you suggested I'd only calculate sys.argv[1:] once)
>
> ... or you could replace whole section between the for loop and
> hosts.append with:
>
> ? ? if sorted(hostname.split(".")) == sorted(sys.argv[1:]):
> ? ? ? ? host.append(hostname)

This doesn't actually work, because I'm not looking for a one to one
mapping of args to sections of hostname, but rather a subset. So
passing in 'prod sfo' would register a match for '001.webapp.prod.sfo'.


From pemerson at gmail.com  Fri Mar  5 10:55:00 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 07:55:00 -0800 (PST)
Subject: Evaluate my first python script, please
References: <Xns9D328A6F02AB0duncanbooth@127.0.0.1>
	<mailman.350.1267799340.23598.python-list@python.org> 
	<Xns9D32973F91EA1duncanbooth@127.0.0.1>
Message-ID: <6c76b898-9137-49d7-94a0-efd63fc82aed@c37g2000prb.googlegroups.com>

On Mar 5, 7:00?am, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> Jean-Michel Pichavant <jeanmic... at sequans.com> wrote:
> > And tell me how not using regexp will ensure the /etc/hosts processing
> > is correct ? The non regexp solutions provided in this thread did not
> > handled what you rightfully pointed out about host list and commented
> > lines.
>
> It won't make is automatically correct, but I'd guess that written without
> being so dependent on regexes might have made someone point out those
> deficiencies sooner. The point being that casual readers of the code won't
> take the time to decode the regex, they'll glance over it and assume it
> does something or other sensible.
>
> If I was writing that code, I'd read each line, strip off comments and
> leading whitespace (so you can use re.match instead of re.search), split on
> whitespace and take all but the first field. I might check that the field
> I'm ignoring it something like a numeric ip address, but if I did want to
> do then I'd include range checking for valid octets so still no regex.
>
> The whole of that I'd wrap in a generator so what you get back is a
> sequence of host names.
>
> However that's just me. I'm not averse to regular expressions, I've written
> some real mammoths from time to time, but I do avoid them when there are
> simpler clearer alternatives.
>
> > And FYI, the OP pattern does match '192.168.200.1 (foo123)'
> > ...
> > Ok that's totally unfair :D You're right I made a mistake. ?Still the
> > comment is absolutely required (provided it's correct).
>
> Yes, the comment would have been good had it been correct. I'd also go for
> a named group as that provides additional context within the regex.
>
> Also if there are several similar regular expressions in the code, or if
> they get too complex I'd build them up in parts. e.g.
>
> OCTET = r'(?:\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])'
> ADDRESS = (OCTET + r'\.') * 3 + OCTET
> HOSTNAME = r'[-a-zA-Z0-9]+(?:\.[-a-zA-Z0-9]+)*'
> ? # could use \S+ but my Linux manual says
> ? # alphanumeric, dash and dots only
> ... and so on ...
>
> which provides another way of documenting the intentions of the regex.
>
> BTW, I'm not advocating that here, the above patterns would be overkill,
> but in more complex situations thats what I'd do.
>
> --
> Duncan Boothhttp://kupuguy.blogspot.com

All good comments here. The takeaway for my lazy style of regexes
(which makes it harder for non-regex fiends to read, regardless of the
language) is that there are ways to make regexes much more readable to
the untrained eye. Duncan, I like your method of defining sections of
the regex outside the regex itself, even if it's a one time use.


From john at castleamber.com  Fri Mar  5 10:55:11 2010
From: john at castleamber.com (John Bokma)
Date: Fri, 05 Mar 2010 09:55:11 -0600
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org>
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
	<mailman.199.1267631220.23598.python-list@python.org>
	<7xlje8lb9o.fsf@ruckus.brouhaha.com> <7vbiuqF4utU1@mid.individual.net>
	<4b90bb3c$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <87sk8ercf4.fsf@castleamber.com>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:

> On Fri, 05 Mar 2010 18:36:06 +1300, Gregory Ewing wrote:
>
>> Paul Rubin wrote:
>>> ReST was another solution in search of a problem.
>> 
>> I think the basic idea behind ReST is quite good, i.e. understanding as
>> markup various typographical conventions that make sense in plain text,
>> such as underlined headings, bullets, numbered paragraphs.
>> 
>> Unfortunately it went overboard with a slew of cryptic codes for
>> footnotes, hyperlinks, etc. that nobody would naturally think to use in
>> a plain text document.
>
> I use footnotes all the time[1] in plain text documents and emails. I 
> don't think there's anything bizarre about it at all.


http://docutils.sourceforge.net/docs/user/rst/quickref.html#footnotes [#]_.

.. [#] the keyword is ReST.

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From showell30 at yahoo.com  Fri Mar  5 11:01:12 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Fri, 5 Mar 2010 08:01:12 -0800 (PST)
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org> 
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>
	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>
	<mailman.64.1267463648.23598.python-list@python.org>
	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>
	<7xljebyl56.fsf@ruckus.brouhaha.com>
	<mailman.70.1267468806.23598.python-list@python.org> 
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com> 
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>
	<7x635fdcth.fsf@ruckus.brouhaha.com>
	<mailman.199.1267631220.23598.python-list@python.org> 
	<7xlje8lb9o.fsf@ruckus.brouhaha.com>
	<e6f5c938-dfac-4c0c-8b4b-cbda2a670dcf@x1g2000prb.googlegroups.com>
	<7xvddbqkgp.fsf@ruckus.brouhaha.com>
Message-ID: <a996c58b-5dcb-49cd-9db8-242fe26e4e11@o16g2000prh.googlegroups.com>

On Mar 4, 11:46?pm, Paul Rubin <no.em... at nospam.invalid> wrote:
>
> Ehh, either the JSON standardizers care about this issue or else they
> don't. ?JSON (as currently defined) is a machine-to-machine
> serialization format and just isn't that good a choice for handwritten
> files. ?Adding a comment specification is a small perturbation that
> might be accepted into the standard, but a big departure like RSON is a
> whole nother creature.
>
> > How many hundreds of thousands of people have had to deal with XML
> > without receiving its benefits? ?Do well-established standards get an
> > exemption from the rule that software is not allowed to annoy non-
> > willing users of it?
>
> We already have to deal with XML. ?So using XML for config files doesn't
> require anyone to deal with any lousy formats that they didn't have to
> deal with before. ?So the basic answer to your question about
> well-established standards is yes: one annoying but standardized format
> is better than multiple annoying unstandardized ones.

<question type="rhetorical">
Does this mean we should stick with XML until the end of time?
</question>



From tim.wintle at teamrubber.com  Fri Mar  5 11:07:22 2010
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Fri, 05 Mar 2010 16:07:22 +0000
Subject: Evaluate my first python script, please
In-Reply-To: <75a58067-9554-496b-ba38-1a3a8023d866@w27g2000pre.googlegroups.com>
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
	<mailman.335.1267780414.23598.python-list@python.org>
	<75a58067-9554-496b-ba38-1a3a8023d866@w27g2000pre.googlegroups.com>
Message-ID: <1267805242.29768.7.camel@localhost>

On Fri, 2010-03-05 at 07:53 -0800, Pete Emerson wrote:
> Thanks for your response, further questions inline.
> 
> On Mar 4, 11:07 am, Tim Wintle <tim.win... at teamrubber.com> wrote:
> > On Thu, 2010-03-04 at 10:39 -0800, Pete Emerson wrote:
> > > I am looking for advice along the lines of "an easier way to do this"
> > > or "a more python way" (I'm sure that's asking for trouble!) or
> > > "people commonly do this instead" or "here's a slick trick" or "oh,
> > > interesting, here's my version to do the same thing".
> >
> > (1) I would wrap it all in a function
> >
> > def main():
> >     # your code here
> >
> > if __name__ == "__main__":
> >     main()
> 
> Is this purely aesthetic reasons, or will I appreciate this when I
> write my own modules, or something else?

It's for when you reuse this code. 

Consider it's in "mymodule.py" (so run with ./mymodule.py) - if you then
make a "tests.py" (for example) you can "import mymodule" without it
automatically running your code.

re-writing it

def main(args):
    #your code

if __name__ == "__main__":
    main(sys.argv[1:])

would obviously be more sensible for actually writing tests.


> > ... or you could replace whole section between the for loop and
> > hosts.append with:
> >
> >     if sorted(hostname.split(".")) == sorted(sys.argv[1:]):
> >         host.append(hostname)
> 
> This doesn't actually work, because I'm not looking for a one to one
> mapping of args to sections of hostname, but rather a subset. So
> passing in 'prod sfo' would register a match for '001.webapp.prod.sfo'.

Ah - good point - I guess the the set intersection technique someone
else mentioned is best in that case.

Tim



From chris.lieb at gmail.com  Fri Mar  5 11:08:56 2010
From: chris.lieb at gmail.com (Chris Lieb)
Date: Fri, 5 Mar 2010 08:08:56 -0800 (PST)
Subject: Failure in test_hashlib.py and test_hmac.py
References: <175865db-f64a-4633-8e36-ab4a5a5eaccf@x22g2000yqx.googlegroups.com>
	<7xr5nzqkaw.fsf@ruckus.brouhaha.com>
Message-ID: <a8172d6e-4507-4201-a94f-20a47892bd79@g11g2000yqe.googlegroups.com>

On Mar 5, 2:50?am, Paul Rubin <no.em... at nospam.invalid> wrote:
> Chris Lieb <chris.l... at gmail.com> writes:
> > I am building Python 2.6.4 on a shared server and am encountering test
> > failures in test_hashlib.py and test_hmac.py,
>
> You should certainly file a bug report (bugs.python.org). ?If you want
> to debug it yourself and include a patch, that's great. ?Otherwise, just
> file the report.
>
> ? ? In the case of test_hashlib.py, it segfaulted on the first sha512 test
> ? ? when I didn't have the debugging options enabled. ?Only after enabling
> ? ? debugging did I get FAIL's for the sha512 tests.
>
> ? ? Does anyone know what is causing these failures?
>
> Please be precise about the hw and compiler versions.

I have created this as bug 8073 [http://bugs.python.org/issue8073]


From python.list at tim.thechases.com  Fri Mar  5 11:28:41 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Fri, 05 Mar 2010 10:28:41 -0600
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <a996c58b-5dcb-49cd-9db8-242fe26e4e11@o16g2000prh.googlegroups.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<mailman.64.1267463648.23598.python-list@python.org>	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>	<7xljebyl56.fsf@ruckus.brouhaha.com>	<mailman.70.1267468806.23598.python-list@python.org>
	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>	<7x635fdcth.fsf@ruckus.brouhaha.com>	<mailman.199.1267631220.23598.python-list@python.org>
	<7xlje8lb9o.fsf@ruckus.brouhaha.com>	<e6f5c938-dfac-4c0c-8b4b-cbda2a670dcf@x1g2000prb.googlegroups.com>	<7xvddbqkgp.fsf@ruckus.brouhaha.com>
	<a996c58b-5dcb-49cd-9db8-242fe26e4e11@o16g2000prh.googlegroups.com>
Message-ID: <4B913139.7000704@tim.thechases.com>

Steve Howell wrote:
> On Mar 4, 11:46 pm, Paul Rubin <no.em... at nospam.invalid> wrote:
>> We already have to deal with XML.  So using XML for config files doesn't
>> require anyone to deal with any lousy formats that they didn't have to
>> deal with before.  So the basic answer to your question about
>> well-established standards is yes: one annoying but standardized format
>> is better than multiple annoying unstandardized ones.
> 
> <question type="rhetorical">
> Does this mean we should stick with XML until the end of time?
> </question>

One word:  COBOL

:-)

-tkc




From mrmakent at gmail.com  Fri Mar  5 11:29:59 2010
From: mrmakent at gmail.com (Mike Kent)
Date: Fri, 5 Mar 2010 08:29:59 -0800 (PST)
Subject: A "scopeguard" for Python
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<mailman.209.1267635630.23598.python-list@python.org>
	<cf51c311-7354-4e89-ab2e-45bb8b66d67d@z35g2000yqd.googlegroups.com>
	<mailman.320.1267754017.23598.python-list@python.org>
Message-ID: <c1ecd9a2-9cdf-408d-9743-7e1dfa05bf47@q23g2000yqd.googlegroups.com>

On Mar 4, 8:04?pm, Robert Kern <robert.k... at gmail.com> wrote:

> No, the try: finally: is not implicit. See the source for
> contextlib.GeneratorContextManager. When __exit__() gets an exception from the
> with: block, it will push it into the generator using its .throw() method. This
> raises the exception inside the generator at the yield statement.

Wow, I just learned something new.  My understanding of context
managers was that the __exit__ method was guaranteed to be executed
regardless of how the context was left.  I have often written my own
context manager classes, giving them the __enter__ and __exit__
methods.  I had mistakenly assumed that the @contextmanager decorator
turned a generator function into a context manager with the same
behavior as the equivalent context manager class.  Now I learn that,
no, in order to have the 'undo' code executed in the presence of an
exception, you must write your own try/finally block in the generator
function.

This raises the question in my mind: What's the use case for using
@contextmanager rather than wrapping your code in a context manager
class that defines __enter__ and __exit__, if you still have to
manager your own try/finally block?


From showell30 at yahoo.com  Fri Mar  5 11:38:27 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Fri, 5 Mar 2010 08:38:27 -0800 (PST)
Subject: A "scopeguard" for Python
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<mailman.209.1267635630.23598.python-list@python.org>
	<cf51c311-7354-4e89-ab2e-45bb8b66d67d@z35g2000yqd.googlegroups.com>
	<mailman.320.1267754017.23598.python-list@python.org>
	<c1ecd9a2-9cdf-408d-9743-7e1dfa05bf47@q23g2000yqd.googlegroups.com>
Message-ID: <38c910f9-0ab5-44cf-8cdc-128d5720324c@f17g2000prh.googlegroups.com>

On Mar 5, 8:29?am, Mike Kent <mrmak... at gmail.com> wrote:
> On Mar 4, 8:04?pm, Robert Kern <robert.k... at gmail.com> wrote:
>
> > No, the try: finally: is not implicit. See the source for
> > contextlib.GeneratorContextManager. When __exit__() gets an exception from the
> > with: block, it will push it into the generator using its .throw() method. This
> > raises the exception inside the generator at the yield statement.
>
> Wow, I just learned something new. ?My understanding of context
> managers was that the __exit__ method was guaranteed to be executed
> regardless of how the context was left. ?I have often written my own
> context manager classes, giving them the __enter__ and __exit__
> methods. ?I had mistakenly assumed that the @contextmanager decorator
> turned a generator function into a context manager with the same
> behavior as the equivalent context manager class. ?Now I learn that,
> no, in order to have the 'undo' code executed in the presence of an
> exception, you must write your own try/finally block in the generator
> function.
>
> This raises the question in my mind: What's the use case for using
> @contextmanager rather than wrapping your code in a context manager
> class that defines __enter__ and __exit__, if you still have to
> manager your own try/finally block?

Unless I am misunderstanding the question, the use case is that you
still only have to write the context manager once, and you might get
multiple uses out of it where the with-enclosed code blocks work at a
higher level of abstraction.

I actually don't use @contextmanager yet, mainly because I did not
know it existed until recently, but also because I find the __enter__/
__exit__ paradigm straightforward enough to just hand code them that
way.



From pruebauno at latinmail.com  Fri Mar  5 11:41:24 2010
From: pruebauno at latinmail.com (nn)
Date: Fri, 5 Mar 2010 08:41:24 -0800 (PST)
Subject: loop over list and process into groups
References: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>
	<mailman.344.1267795628.23598.python-list@python.org>
Message-ID: <7a1d6fe9-d2c8-4c7e-8173-1e6b4d010f6a@g26g2000yqn.googlegroups.com>



mk wrote:
> Sneaky Wombat wrote:
> > [ 'VLAN4065',
> >  'Interface',
> >  'Gi9/6',
> >  'Po2',
> >  'Po3',
> >  'Po306',
> >  'VLAN4068',
> >  'Interface',
> >  'Gi9/6',
> >  'VLAN4069',
> >  'Interface',
> >  'Gi9/6',]
>
> Hey, I just invented a cute ;-) two-liner using list comprehensions:
>
> # alist = list above
>
> tmp, dk = [], {}
> [(x.startswith('VLAN') and (dk.setdefault(x,[]) or tmp.append(x))) or
> (not x.startswith('VLAN') and dk[tmp[-1]].append(x))    for x in alist
> if x != 'Interface']
>
> No need to use a nuke like itertools to kill a fly. ;-)
>
> Regards,
> mk

Oh my! You could have at least used some "if else" to make it a little
bit easier on the eyes :-)

[(dk.setdefault(x,[]) or tmp.append(x))
   if x.startswith('VLAN')
   else dk[tmp[-1]].append(x)
   for x in alist
   if x != 'Interface']


From showell30 at yahoo.com  Fri Mar  5 11:49:41 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Fri, 5 Mar 2010 08:49:41 -0800 (PST)
Subject: A "scopeguard" for Python
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<mailman.209.1267635630.23598.python-list@python.org>
	<cf51c311-7354-4e89-ab2e-45bb8b66d67d@z35g2000yqd.googlegroups.com>
	<mailman.320.1267754017.23598.python-list@python.org>
Message-ID: <d099f881-2484-48f6-838a-7718f10dd8a8@k2g2000pro.googlegroups.com>

On Mar 4, 5:04?pm, Robert Kern <robert.k... at gmail.com> wrote:
> On 2010-03-04 15:19 PM, Mike Kent wrote:
>
>
>
> > On Mar 3, 12:00 pm, Robert Kern<robert.k... at gmail.com> ?wrote:
> >> On 2010-03-03 09:39 AM, Mike Kent wrote:
>
> >>> What's the compelling use case for this vs. a simple try/finally?
>
> >>> ? ? ?original_dir = os.getcwd()
> >>> ? ? ?try:
> >>> ? ? ? ? ?os.chdir(somewhere)
> >>> ? ? ? ? ?# Do other stuff
> >>> ? ? ?finally:
> >>> ? ? ? ? ?os.chdir(original_dir)
> >>> ? ? ? ? ?# Do other cleanup
>
> >> A custom-written context manager looks nicer and can be more readable.
>
> >> from contextlib import contextmanager
> >> import os
>
> >> @contextmanager
> >> def pushd(path):
> >> ? ? ? original_dir = os.getcwd()
> >> ? ? ? os.chdir(path)
> >> ? ? ? try:
> >> ? ? ? ? ? yield
> >> ? ? ? finally:
> >> ? ? ? ? ? os.chdir(original_dir)
>
> >> with pushd(somewhere):
> >> ? ? ? ...
>
> > Robert, I like the way you think. ?That's a perfect name for that
> > context manager! ?However, you can clear one thing up for me... isn't
> > the inner try/finally superfluous? ?My understanding was that there
> > was an implicit try/finally already done which will insure that
> > everything after the yield statement was always executed.
>
> No, the try: finally: is not implicit. See the source for
> contextlib.GeneratorContextManager. When __exit__() gets an exception from the
> with: block, it will push it into the generator using its .throw() method. This
> raises the exception inside the generator at the yield statement.
>

See also:

http://docs.python.org/library/contextlib.html

The closing() helper can be used to automatically call thing.close()
even after an exception.

If you do not use the closing() helper and take on the responsibility
yourself of doing try/finally within your generator, I think you still
gain some overall simplicity:

  1) You don't need to do try/finally in your with blocks, of course.
  2) The generator itself probably reads more straightforwardly then a
hand-coded class with __enter__ and __exit__.

For point #2, I think there are probably different aesthetics.
Generators are more concise, but they are also a bit mind-bending.


From tjreedy at udel.edu  Fri Mar  5 11:57:13 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 05 Mar 2010 11:57:13 -0500
Subject: Generic singleton
In-Reply-To: <4b907b5e$0$27863$c3e8da3@news.astraweb.com>
References: <mailman.222.1267642515.23598.python-list@python.org>	<pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>	<Xns9D317DB33C63Aduncanbooth@127.0.0.1>
	<4b907b5e$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <hmrd58$qlt$1@dough.gmane.org>

On 3/4/2010 10:32 PM, Steven D'Aprano wrote:

> Python does have it's own singletons, like None, True and False.

True and False are not singletons.

 > For some reason, they behave quite differently:

Because they are quite different.

 > NoneType fails if you try to instantiate it again,

Because trying 'type(None)()' was probably judged to be more likely to 
be a bug than something useful.

 > while bool returns the appropriate existing singleton: [sic]

Branching on boolean values (which are no more singletons than 0, 1, 
...) is basic to computing.

> I wonder why NoneType doesn't just return None?

What would you have NoneType(x) do? Or the special case NoneType(None)?
The issue has come up as to whether object(x) should ignore or raise.
In 3.x, it raises.
   TypeError: object.__new__() takes no parameters
but I believe this is changed from at least some 2.x versions that 
ignored (apparently by 'accident').

Terry Jan Reedy



From robert.kern at gmail.com  Fri Mar  5 12:00:22 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 05 Mar 2010 11:00:22 -0600
Subject: A "scopeguard" for Python
In-Reply-To: <c1ecd9a2-9cdf-408d-9743-7e1dfa05bf47@q23g2000yqd.googlegroups.com>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<mailman.209.1267635630.23598.python-list@python.org>	<cf51c311-7354-4e89-ab2e-45bb8b66d67d@z35g2000yqd.googlegroups.com>	<mailman.320.1267754017.23598.python-list@python.org>
	<c1ecd9a2-9cdf-408d-9743-7e1dfa05bf47@q23g2000yqd.googlegroups.com>
Message-ID: <hmrdb6$rgn$1@dough.gmane.org>

On 2010-03-05 10:29 AM, Mike Kent wrote:
> On Mar 4, 8:04 pm, Robert Kern<robert.k... at gmail.com>  wrote:
>
>> No, the try: finally: is not implicit. See the source for
>> contextlib.GeneratorContextManager. When __exit__() gets an exception from the
>> with: block, it will push it into the generator using its .throw() method. This
>> raises the exception inside the generator at the yield statement.
>
> Wow, I just learned something new.  My understanding of context
> managers was that the __exit__ method was guaranteed to be executed
> regardless of how the context was left.

It is. @contextmanager turns a specially-written generator into a context 
manager with an __exit__ that does different things depending on whether or not 
and exception was raised. By pushing the exception into the generator, it lets 
the author decide what to do. It may catch a subset of exceptions, or no 
exceptions, or use a finally:. They all have use cases although finally: is the 
usual one.

> I have often written my own
> context manager classes, giving them the __enter__ and __exit__
> methods.  I had mistakenly assumed that the @contextmanager decorator
> turned a generator function into a context manager with the same
> behavior as the equivalent context manager class.

Basically, it does. __exit__() is given the exception information. When you 
write such a class, you can decide what to do with the exception. You can 
silence it, immediately reraise it, conditionally reraise it, log it and then 
reraise it, etc. Pushing the exception into the generator keeps this flexibility 
and the equivalence. If it removed that choice, then it would not be equivalent.

> Now I learn that,
> no, in order to have the 'undo' code executed in the presence of an
> exception, you must write your own try/finally block in the generator
> function.
>
> This raises the question in my mind: What's the use case for using
> @contextmanager rather than wrapping your code in a context manager
> class that defines __enter__ and __exit__, if you still have to
> manager your own try/finally block?

The @contextmanager generator implementations are often shorter and easier to 
read, in my opinion, partly because they use the try: finally: syntax that most 
of us are very familiar with. I have to think less when I read it because it 
looks so similar to the equivalent code that you would normally write.

The point of context managers isn't to remove the use of try: finally: entirely, 
but to implement it once so that it can be reused cleanly. You only have to 
write the one try: finally: in the generator and reuse it simply with the with: 
statement in many places.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From lbolla at gmail.com  Fri Mar  5 12:09:08 2010
From: lbolla at gmail.com (lbolla)
Date: Fri, 5 Mar 2010 09:09:08 -0800 (PST)
Subject: loop over list and process into groups
References: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>
	<mailman.344.1267795628.23598.python-list@python.org>
Message-ID: <8de6ccfb-c096-4f16-ad99-1bce5dfb12d0@j27g2000yqn.googlegroups.com>

On Mar 5, 1:26?pm, mk <mrk... at gmail.com> wrote:
> Sneaky Wombat wrote:
> > [ 'VLAN4065',
> > ?'Interface',
> > ?'Gi9/6',
> > ?'Po2',
> > ?'Po3',
> > ?'Po306',
> > ?'VLAN4068',
> > ?'Interface',
> > ?'Gi9/6',
> > ?'VLAN4069',
> > ?'Interface',
> > ?'Gi9/6',]
>
> Hey, I just invented a cute ;-) two-liner using list comprehensions:
>
> # alist = list above
>
> tmp, dk = [], {}
> [(x.startswith('VLAN') and (dk.setdefault(x,[]) or tmp.append(x))) or
> (not x.startswith('VLAN') and dk[tmp[-1]].append(x)) ? ?for x in alist
> if x != 'Interface']
>
> No need to use a nuke like itertools to kill a fly. ;-)
>
> Regards,
> mk

It looks like Perl ;-)


From mrkafk at gmail.com  Fri Mar  5 12:10:54 2010
From: mrkafk at gmail.com (mk)
Date: Fri, 05 Mar 2010 18:10:54 +0100
Subject: loop over list and process into groups
In-Reply-To: <7a1d6fe9-d2c8-4c7e-8173-1e6b4d010f6a@g26g2000yqn.googlegroups.com>
References: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>	<mailman.344.1267795628.23598.python-list@python.org>
	<7a1d6fe9-d2c8-4c7e-8173-1e6b4d010f6a@g26g2000yqn.googlegroups.com>
Message-ID: <hmrdut$tvp$1@dough.gmane.org>

nn wrote:

> Oh my! You could have at least used some "if else" to make it a little
> bit easier on the eyes :-)

That's my entry into """'Obfuscated' "Python" '"''code''"' 
'"contest"'""" and I'm proud of it. ;-)

Regards,
mk



From mrkafk at gmail.com  Fri Mar  5 12:14:16 2010
From: mrkafk at gmail.com (mk)
Date: Fri, 05 Mar 2010 18:14:16 +0100
Subject: isinstance(False, int)
Message-ID: <hmre56$tvp$2@dough.gmane.org>

 >>> isinstance(False, int)
True
 >>>
 >>> isinstance(True, int)
True

Huh?

 >>>
 >>> issubclass(bool, int)
True

Huh?!

Regards,
mk





From mrkafk at gmail.com  Fri Mar  5 12:16:12 2010
From: mrkafk at gmail.com (mk)
Date: Fri, 05 Mar 2010 18:16:12 +0100
Subject: loop over list and process into groups
In-Reply-To: <8de6ccfb-c096-4f16-ad99-1bce5dfb12d0@j27g2000yqn.googlegroups.com>
References: <3e1272ac-aed5-44a4-b40e-fc6dec350a77@k17g2000yqb.googlegroups.com>	<mailman.344.1267795628.23598.python-list@python.org>
	<8de6ccfb-c096-4f16-ad99-1bce5dfb12d0@j27g2000yqn.googlegroups.com>
Message-ID: <hmre8r$tvp$3@dough.gmane.org>

lbolla wrote:
> It looks like Perl ;-)

A positive proof that you can write perl code in Python. I, for 
instance, have had my brain warped by C and tend to write C-like code in 
Python. That's only half a joke, sadly. I'm trying to change my habits 
but it's hard.

Regards,
mk




From tjreedy at udel.edu  Fri Mar  5 12:17:43 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 05 Mar 2010 12:17:43 -0500
Subject: comparing two lists
In-Reply-To: <d817b4e1-192b-40e6-9a9d-75c3cbbd4ccd@t31g2000prh.googlegroups.com>
References: <d817b4e1-192b-40e6-9a9d-75c3cbbd4ccd@t31g2000prh.googlegroups.com>
Message-ID: <hmrebl$u8a$1@dough.gmane.org>

On 3/5/2010 3:05 AM, jimgardener wrote:
> hi
> I have two lists of names.I need to find the difference between these
> two lists.I tried to do it using sets.But I am wondering if there is a
> better way to do it.Please tell me if there is a more elegant way.
> thanks,
> jim
>
> my code snippet follows..
>
> oldlst=['jon','arya','ned','bran']
> newlst=['jaime','jon','cersei']
>
> newlyadded=set(newlst)-set(oldlst)
> removed=set(oldlst)-set(newlst)
> unchanged=set(oldlst)&  set(newlst)

Except for the duplicate calls to set, this is fine. If order and 
duplication are irrelevant (and hashability is guaranteed), use sets to 
start with.

> print '%d were newly added= %s'%(len(newlyadded),list(newlyadded))
> print '%d were removed=%s'%(len(removed),list(removed))
> print '%d were unchanged=%s'%(len(unchanged),list(unchanged))
>
> this produces the output
> --------------
> 2 were newly added= ['jaime', 'cersei']
> 3 were removed=['ned', 'arya', 'bran']
> 1 were unchanged=['jon']




From tjreedy at udel.edu  Fri Mar  5 12:26:00 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 05 Mar 2010 12:26:00 -0500
Subject: ImportError: No module named glib
In-Reply-To: <7c857e8c1003050030x39b75c98veace4ef8eebe606a@mail.gmail.com>
References: <7c857e8c1003050030x39b75c98veace4ef8eebe606a@mail.gmail.com>
Message-ID: <hmrer7$1ov$1@dough.gmane.org>

On 3/5/2010 3:30 AM, Michael Joachimiak wrote:
> I am too new to python.
> If anybody has an idea what to do please help.
> when I use
>
> import glib
>
> in my code I get this:
>
>>>> import glib
> Traceback (most recent call last):
>    File "<stdin>", line 1, in<module>
> ImportError: No module named glib

glib is not in Python's stdlib so it must be loaded somewhere the 
interpreter can find it. Do

 >>> import sys
 >>> sys.path

and see if it is in any of the listed directories.

Perhaps you need to import pyglib?

Terry Jan Reedy

> :~$ python -V
> Python 2.6.4
>
> /usr/lib/libpyglib-2.0-python2.6.so.0.0.0 exists in version 2.18.0-0ubuntu2
>
> :~$ pkg-config glib-2.0 --cflags --libs
> -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include  -lglib-2.0




From kamil at lucem.pl  Fri Mar  5 12:44:02 2010
From: kamil at lucem.pl (Kamil Wasilewski)
Date: Fri, 5 Mar 2010 18:44:02 +0100
Subject: Escaping variable names
Message-ID: <11910654174.20100305184402@lucem.pl>

Hi,

Ive got an issue where a variable name needs to have a minus sign (-) in it.

#Python 2.6
from SOAPpy import WSDL
wsdlFile = "http://webapi.allegro.pl/uploader.php?wsdl"
server = WSDL.Proxy(wsdlFile)
server.soapproxy.config.argsOrdering = {'doGetCountries': ['country-code', 'webapi-key'] }
server.doGetCountries(country-code=COUNTRYID}, webapi-key=WEBAPIKEY)

The above method allows me to specify the order and name of variables being sent, but i have a problem since the variables have a "-" sign in the middle, is there a way to escape it in the variable name or get around the problem?

Thanks!



From steve at holdenweb.com  Fri Mar  5 13:00:09 2010
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 05 Mar 2010 13:00:09 -0500
Subject: isinstance(False, int)
In-Reply-To: <hmre56$tvp$2@dough.gmane.org>
References: <hmre56$tvp$2@dough.gmane.org>
Message-ID: <hmrgrg$8ok$1@dough.gmane.org>

mk wrote:
>>>> isinstance(False, int)
> True
>>>>
>>>> isinstance(True, int)
> True
> 
> Huh?
> 
>>>>
>>>> issubclass(bool, int)
> True
> 
> Huh?!
> 
>>> 3+True
4
>>> 3+False
3
>>>

Just a brainfart from the BDFL - he decided (around 2.2.3, IIRC) that it
would be a good ideal for Booleans to be a subclass of integers.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at REMOVE-THIS-cybersource.com.au  Fri Mar  5 13:01:11 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 18:01:11 GMT
Subject: Generic singleton
References: <mailman.222.1267642515.23598.python-list@python.org>
	<pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>
	<Xns9D317DB33C63Aduncanbooth@127.0.0.1>
	<4b907b5e$0$27863$c3e8da3@news.astraweb.com>
	<mailman.354.1267808250.23598.python-list@python.org>
Message-ID: <4b9146e6$0$27863$c3e8da3@news.astraweb.com>

On Fri, 05 Mar 2010 11:57:13 -0500, Terry Reedy wrote:

> On 3/4/2010 10:32 PM, Steven D'Aprano wrote:
> 
>> Python does have it's own singletons, like None, True and False.
> 
> True and False are not singletons.

Duotons? Doubletons?

>>> t1 = bool(1)
>>> t2 = bool(1)
>>> t1 is t2
True
>>> t1 is t2 is bool("this is also true") is bool(['so', 'is', 'this'])
True

They're described as singletons in the PEP, so if you want to argue with 
Guido, go right ahead... *grin*

http://www.python.org/dev/peps/pep-0285/



>  > For some reason, they behave quite differently:
> 
> Because they are quite different.

Well, list("hello world") and list("goodbye now") are quite different 
too, but they behave very similarly.


>  > NoneType fails if you try to instantiate it again,
> 
> Because trying 'type(None)()' was probably judged to be more likely to
> be a bug than something useful.

Obviously people are unlikely to write type(None)(), but they are likely 
to do something like:

result = call_some_function(args)
more_code_here()
blah_blah_blah()
new_obj = type(result)()
do_something_with(new_obj)

If result happens to end up being None, I'm not convinced that the caller 
would rather have an exception than get the obvious None. If result 
happened to be 0, wouldn't you rather get 0 than have it blow up? I don't 
see why None should be any different.


>  > while bool returns the appropriate existing singleton: [sic]
> 
> Branching on boolean values (which are no more singletons than 0, 1,
> ...) is basic to computing.

What does that have to do with the price of fish? I didn't mention 
anything about branching on bools.

Once a singleton class has been instantiated the first time, you have a 
choice if the user tries to instantiate it again. You can do what 
NoneType does, and raise an error. Or you can do what bool does, and 
return the existing instance.

Obviously, the behaviour of bool is far more useful. So I wonder why 
NoneType doesn't do the same.



>> I wonder why NoneType doesn't just return None?
> 
> What would you have NoneType(x) do? 

The same thing any function of zero arguments does when it gets called 
with one argument.


> Or the special case NoneType(None)?

Why would that be a special case? If NoneType takes no arguments, and you 
supply an argument, then it is an error regardless of what that argument 
happens to be.


-- 
Steven


From peloko45 at gmail.com  Fri Mar  5 13:01:40 2010
From: peloko45 at gmail.com (Joan Miller)
Date: Fri, 5 Mar 2010 10:01:40 -0800 (PST)
Subject: Slicing [N::-1]
Message-ID: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>

What does a slice as [N::-1] ?

It looks that in the first it reverses the slice and then it shows
only N items, right?

Could you add an example to get the same result without use `::` to
see it more clear?

Thanks in advance


From arnodel at googlemail.com  Fri Mar  5 13:03:49 2010
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Fri, 05 Mar 2010 18:03:49 +0000
Subject: isinstance(False, int)
References: <mailman.357.1267809307.23598.python-list@python.org>
Message-ID: <m2aaum1w8q.fsf@googlemail.com>

mk <mrkafk at gmail.com> writes:

>>>> isinstance(False, int)
> True
>>>>
>>>> isinstance(True, int)
> True
>
> Huh?
>
>>>>
>>>> issubclass(bool, int)
> True
>
> Huh?!
>
> Regards,
> mk

Yes, and:

>>> True + False
1

In fact:

>>> 1 == True
True
>>> 0 == False
True

So what's your question?

-- 
Arnaud


From apt.shansen at gmail.com  Fri Mar  5 13:06:15 2010
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Fri, 5 Mar 2010 10:06:15 -0800
Subject: isinstance(False, int)
In-Reply-To: <hmre56$tvp$2@dough.gmane.org>
References: <hmre56$tvp$2@dough.gmane.org>
Message-ID: <7a9c25c21003051006q571c5e45r49c47e82fe2a2f7f@mail.gmail.com>

On Fri, Mar 5, 2010 at 9:14 AM, mk <mrkafk at gmail.com> wrote:

> >>> isinstance(False, int)
> True
> >>>
> >>> isinstance(True, int)
> True
>
> Huh?
>
> >>>
> >>> issubclass(bool, int)
> True
>
> Huh?!
>

Huh, what?

http://www.python.org/dev/peps/pep-0285/

--S
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From steve at REMOVE-THIS-cybersource.com.au  Fri Mar  5 13:07:29 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 18:07:29 GMT
Subject: isinstance(False, int)
References: <mailman.357.1267809307.23598.python-list@python.org>
Message-ID: <4b914860$0$27863$c3e8da3@news.astraweb.com>

On Fri, 05 Mar 2010 18:14:16 +0100, mk wrote:

>>>> isinstance(False, int)
> True
>  >>>
>  >>> isinstance(True, int)
> True
> 
> Huh?

Yes. Do you have an actual question?


>  >>> issubclass(bool, int)
> True
> 
> Huh?!

Exactly.

Bools are a late-comer to Python. For historical and implementation 
reasons, they are a subclass of int, because it was normal for people to 
use 0 and 1 as boolean flags, and so making False == 0 and True == 1 was 
the least likely to break code.

E.g. back in the day, you would have something like:

{2:None}.has_key(2) -> 1

So folks would do:

print "The key is", ["missing", "present"][d.has_key(key)]

Which still works even now that has_key returns True or False rather than 
1 or 0.


-- 
Steven


From arnodel at googlemail.com  Fri Mar  5 13:12:05 2010
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Fri, 05 Mar 2010 18:12:05 +0000
Subject: Slicing [N::-1]
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>
Message-ID: <m2wrxqzlhm.fsf@googlemail.com>

Joan Miller <peloko45 at gmail.com> writes:

> What does a slice as [N::-1] ?
>
> It looks that in the first it reverses the slice and then it shows
> only N items, right?
>
> Could you add an example to get the same result without use `::` to
> see it more clear?
>
> Thanks in advance

>>> l = range(10)
>>> l
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> l[7::-1]
[7, 6, 5, 4, 3, 2, 1, 0]
>>> [l[i] for i in range(7, -1, -1)]
[7, 6, 5, 4, 3, 2, 1, 0]

-- 
Arnaud


From jeanmichel at sequans.com  Fri Mar  5 13:14:30 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 05 Mar 2010 19:14:30 +0100
Subject: Escaping variable names
In-Reply-To: <11910654174.20100305184402@lucem.pl>
References: <11910654174.20100305184402@lucem.pl>
Message-ID: <4B914A06.8010204@sequans.com>

Kamil Wasilewski wrote:
> Hi,
>
> Ive got an issue where a variable name needs to have a minus sign (-) in it.
>
> #Python 2.6
> from SOAPpy import WSDL
> wsdlFile = "http://webapi.allegro.pl/uploader.php?wsdl"
> server = WSDL.Proxy(wsdlFile)
> server.soapproxy.config.argsOrdering = {'doGetCountries': ['country-code', 'webapi-key'] }
> server.doGetCountries(country-code=COUNTRYID}, webapi-key=WEBAPIKEY)
>
> The above method allows me to specify the order and name of variables being sent, but i have a problem since the variables have a "-" sign in the middle, is there a way to escape it in the variable name or get around the problem?
>
> Thanks!
>
>   
def foo(*args, **kwargs):
    print kwargs['country-code']

params = {'country-code': 'hello word'}   

foo(**params)


JM


From sjdevnull at yahoo.com  Fri Mar  5 13:19:37 2010
From: sjdevnull at yahoo.com (sjdevnull at yahoo.com)
Date: Fri, 5 Mar 2010 10:19:37 -0800 (PST)
Subject: Evaluate my first python script, please
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
	<mailman.335.1267780414.23598.python-list@python.org>
	<75a58067-9554-496b-ba38-1a3a8023d866@w27g2000pre.googlegroups.com>
Message-ID: <a0b34928-e247-4efd-81f8-0d271165fa10@y11g2000yqh.googlegroups.com>

On Mar 5, 10:53?am, Pete Emerson <pemer... at gmail.com> wrote:
> Thanks for your response, further questions inline.
>
> On Mar 4, 11:07?am, Tim Wintle <tim.win... at teamrubber.com> wrote:
>
> > On Thu, 2010-03-04 at 10:39 -0800, Pete Emerson wrote:
> > > I am looking for advice along the lines of "an easier way to do this"
> > > or "a more python way" (I'm sure that's asking for trouble!) or
> > > "people commonly do this instead" or "here's a slick trick" or "oh,
> > > interesting, here's my version to do the same thing".
>
> > (1) I would wrap it all in a function
>
> > def main():
> > ? ? # your code here
>
> > if __name__ == "__main__":
> > ? ? main()
>
> Is this purely aesthetic reasons, or will I appreciate this when I
> write my own modules, or something else?

Suppose the above code is in mymodule.py.  By wrapping main() you can:
1. Have another module do:
import mymodule
... (so some stuff, perhaps munge sys.argv)
mymodule.main()
2. If mymodule has a small function in it, someone else can import it
and call that function
3. You can run pylint, pychecker and other source-code checkers that
need to be able to import your module to check it (I wouldn't be
surprised if recent versions of one or the other of those don't
require imports, and some checkers like pyflakes certainly don't).
4. You can easily have a unit tester call into the module

etc.

> > (2) PEP8 (python style guidelines) suggests one import per line
>
> > (3) I'd use four spaces as tab width

+1 on both; it's good to get into the habit of writing standard-
looking Python code.


From steve at REMOVE-THIS-cybersource.com.au  Fri Mar  5 13:22:59 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 18:22:59 GMT
Subject: Slicing [N::-1]
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>
Message-ID: <4b914c02$0$27863$c3e8da3@news.astraweb.com>

On Fri, 05 Mar 2010 10:01:40 -0800, Joan Miller wrote:

> What does a slice as [N::-1] ?

Why don't you try it?

>>> s = "abcdefgh"
>>> s[4::-1]
'edcba'

The rules for extended slicing are not explained very well in the docs, 
and can be confusing. In my experience, apart from [::-1] it is best to 
always use a positive stride (the third number).


-- 
Steven


From darkrho at gmail.com  Fri Mar  5 13:27:48 2010
From: darkrho at gmail.com (Rolando Espinoza La Fuente)
Date: Fri, 5 Mar 2010 14:27:48 -0400
Subject: isinstance(False, int)
In-Reply-To: <hmrgrg$8ok$1@dough.gmane.org>
References: <hmre56$tvp$2@dough.gmane.org> <hmrgrg$8ok$1@dough.gmane.org>
Message-ID: <4eca3f41003051027nb22f3daxc418eeda3ad0a83b@mail.gmail.com>

On Fri, Mar 5, 2010 at 2:00 PM, Steve Holden <steve at holdenweb.com> wrote:
[...]
>
> Just a brainfart from the BDFL - he decided (around 2.2.3, IIRC) that it
> would be a good ideal for Booleans to be a subclass of integers.
>

I would never figured out

>>> bool.__bases__
(<type 'int'>,)

Doesn't have side effects not knowing  that False/True are ints?

Regards,

Rolando


From steve at REMOVE-THIS-cybersource.com.au  Fri Mar  5 13:28:06 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 18:28:06 GMT
Subject: Slicing [N::-1]
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>
	<m2wrxqzlhm.fsf@googlemail.com>
Message-ID: <4b914d35$0$27863$c3e8da3@news.astraweb.com>

On Fri, 05 Mar 2010 18:12:05 +0000, Arnaud Delobelle wrote:

>>>> l = range(10)
>>>> l
> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>>> l[7::-1]
> [7, 6, 5, 4, 3, 2, 1, 0]
>>>> [l[i] for i in range(7, -1, -1)]
> [7, 6, 5, 4, 3, 2, 1, 0]

Where does the first -1 come from? Slices are supposed to have default 
values of 0 and len(seq):

>>> l[7::1]
[7, 8, 9]
>>> [l[i] for i in range(7, len(l), 1)]
[7, 8, 9]
>>> [l[i] for i in range(7, len(l), -1)]
[]


I don't believe the actual behaviour is documented anywhere.


-- 
Steven


From python at mrabarnett.plus.com  Fri Mar  5 13:30:06 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Fri, 05 Mar 2010 18:30:06 +0000
Subject: isinstance(False, int)
In-Reply-To: <hmre56$tvp$2@dough.gmane.org>
References: <hmre56$tvp$2@dough.gmane.org>
Message-ID: <4B914DAE.60209@mrabarnett.plus.com>

mk wrote:
>  >>> isinstance(False, int)
> True
>  >>>
>  >>> isinstance(True, int)
> True
> 
> Huh?
> 
>  >>>
>  >>> issubclass(bool, int)
> True
> 
> Huh?!
> 
Python didn't have Booleans originally, 0 and 1 were used instead. When
bool was introduced it was made a subclass of int so that existing code
wouldn't break.


From mrkafk at gmail.com  Fri Mar  5 13:32:32 2010
From: mrkafk at gmail.com (mk)
Date: Fri, 05 Mar 2010 19:32:32 +0100
Subject: isinstance(False, int)
In-Reply-To: <m2aaum1w8q.fsf@googlemail.com>
References: <mailman.357.1267809307.23598.python-list@python.org>
	<m2aaum1w8q.fsf@googlemail.com>
Message-ID: <hmrinv$ftq$1@dough.gmane.org>

Arnaud Delobelle wrote:

>>>> 1 == True
> True
>>>> 0 == False
> True
> 
> So what's your question?

Well nothing I'm just kind of bewildered: I'd expect smth like that in 
Perl, but not in Python.. Although I can understand the rationale after 
skimming PEP 285, I still don't like it very much.


Regards,
mk




From anand.shashwat at gmail.com  Fri Mar  5 13:33:21 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Sat, 6 Mar 2010 00:03:21 +0530
Subject: Slicing [N::-1]
In-Reply-To: <m2wrxqzlhm.fsf@googlemail.com>
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>
	<m2wrxqzlhm.fsf@googlemail.com>
Message-ID: <d4ab53de1003051033o3f2fbd10mf6b6de5ad9bdb4ba@mail.gmail.com>

On Fri, Mar 5, 2010 at 11:42 PM, Arnaud Delobelle <arnodel at googlemail.com>wrote:

> Joan Miller <peloko45 at gmail.com> writes:
>
> > What does a slice as [N::-1] ?
> >
> > It looks that in the first it reverses the slice and then it shows
> > only N items, right?
> >
> > Could you add an example to get the same result without use `::` to
> > see it more clear?
> >
> > Thanks in advance
>
> >>> l = range(10)
> >>> l
> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
> >>> l[7::-1]
> [7, 6, 5, 4, 3, 2, 1, 0]
> >>> [l[i] for i in range(7, -1, -1)]
> [7, 6, 5, 4, 3, 2, 1, 0]
>

>>> l = range(10)
>>> l
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> l[7::-1]
[7, 6, 5, 4, 3, 2, 1, 0]
>>> list(reversed(l))[-8:]
[7, 6, 5, 4, 3, 2, 1, 0]

~l0nwlf
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From mensanator at aol.com  Fri Mar  5 13:33:46 2010
From: mensanator at aol.com (Mensanator)
Date: Fri, 5 Mar 2010 10:33:46 -0800 (PST)
Subject: Slicing [N::-1]
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>
Message-ID: <464239a8-d78f-4d64-97ba-539f5c8cca26@g11g2000yqe.googlegroups.com>

On Mar 5, 12:01?pm, Joan Miller <pelok... at gmail.com> wrote:
> What does a slice as [N::-1] ?

Starts at position N and returns all items to the start of the
list in reverse order.

>
> It looks that in the first it reverses the slice and then it shows
> only N items, right?

Wrong. It shows N+1 items. Remember, counting starts from 0.

>
> Could you add an example to get the same result without use `::` to
> see it more clear?

for i in range(8,-1,-1):print(a[i],end=' ')

although I doubt this is more clear.

>
> Thanks in advance



From pemerson at gmail.com  Fri Mar  5 13:50:31 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 10:50:31 -0800 (PST)
Subject: Evaluate my first python script, please
References: <86d51bc0-10ca-4168-a5a1-9bc2a33a19d7@x1g2000prb.googlegroups.com>
	<mailman.335.1267780414.23598.python-list@python.org>
	<75a58067-9554-496b-ba38-1a3a8023d866@w27g2000pre.googlegroups.com>
	<a0b34928-e247-4efd-81f8-0d271165fa10@y11g2000yqh.googlegroups.com>
Message-ID: <e2f6cf2e-5314-4836-9f0f-690be12df8f4@t31g2000prh.googlegroups.com>

On Mar 5, 10:19?am, "sjdevn... at yahoo.com" <sjdevn... at yahoo.com> wrote:
> On Mar 5, 10:53?am, Pete Emerson <pemer... at gmail.com> wrote:
>
>
>
>
>
> > Thanks for your response, further questions inline.
>
> > On Mar 4, 11:07?am, Tim Wintle <tim.win... at teamrubber.com> wrote:
>
> > > On Thu, 2010-03-04 at 10:39 -0800, Pete Emerson wrote:
> > > > I am looking for advice along the lines of "an easier way to do this"
> > > > or "a more python way" (I'm sure that's asking for trouble!) or
> > > > "people commonly do this instead" or "here's a slick trick" or "oh,
> > > > interesting, here's my version to do the same thing".
>
> > > (1) I would wrap it all in a function
>
> > > def main():
> > > ? ? # your code here
>
> > > if __name__ == "__main__":
> > > ? ? main()
>
> > Is this purely aesthetic reasons, or will I appreciate this when I
> > write my own modules, or something else?
>
> Suppose the above code is in mymodule.py. ?By wrapping main() you can:
> 1. Have another module do:
> import mymodule
> ... (so some stuff, perhaps munge sys.argv)
> mymodule.main()
> 2. If mymodule has a small function in it, someone else can import it
> and call that function
> 3. You can run pylint, pychecker and other source-code checkers that
> need to be able to import your module to check it (I wouldn't be
> surprised if recent versions of one or the other of those don't
> require imports, and some checkers like pyflakes certainly don't).
> 4. You can easily have a unit tester call into the module
>
> etc.
>
> > > (2) PEP8 (python style guidelines) suggests one import per line
>
> > > (3) I'd use four spaces as tab width
>
> +1 on both; it's good to get into the habit of writing standard-
> looking Python code.

Agreed, noted, and appreciated, with the caveat that using spaces
instead of tabs might border on an emacs vs. vi flamewar in some
circles. I personally will use spaces going forward.


From mensanator at aol.com  Fri Mar  5 13:52:28 2010
From: mensanator at aol.com (Mensanator)
Date: Fri, 5 Mar 2010 10:52:28 -0800 (PST)
Subject: Slicing [N::-1]
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>
	<m2wrxqzlhm.fsf@googlemail.com>
	<4b914d35$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <f2b985f4-f83d-4df4-a7ab-135fc18296c7@q23g2000yqd.googlegroups.com>

On Mar 5, 12:28?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Fri, 05 Mar 2010 18:12:05 +0000, Arnaud Delobelle wrote:
> >>>> l = range(10)
> >>>> l
> > [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
> >>>> l[7::-1]
> > [7, 6, 5, 4, 3, 2, 1, 0]
> >>>> [l[i] for i in range(7, -1, -1)]
> > [7, 6, 5, 4, 3, 2, 1, 0]
>
> Where does the first -1 come from? Slices are supposed to have default
> values of 0 and len(seq):

The only way to get a 0 from a reverse range() is to have a bound of
-1.

>
> >>> l[7::1]
> [7, 8, 9]
> >>> [l[i] for i in range(7, len(l), 1)]
> [7, 8, 9]
> >>> [l[i] for i in range(7, len(l), -1)]
>
> []
>
> I don't believe the actual behaviour is documented anywhere.

Well, it's implied. If the stopping bound in a reverse range()
is greater than the starting bound, you get an empty return.

>
> --
> Steven



From jeanmichel at sequans.com  Fri Mar  5 13:54:10 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 05 Mar 2010 19:54:10 +0100
Subject: isinstance(False, int)
In-Reply-To: <4b914860$0$27863$c3e8da3@news.astraweb.com>
References: <mailman.357.1267809307.23598.python-list@python.org>
	<4b914860$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <4B915352.8010709@sequans.com>

Steven D'Aprano wrote:
> On Fri, 05 Mar 2010 18:14:16 +0100, mk wrote:
>
>   
>>>>> isinstance(False, int)
>>>>>           
>> True
>>  >>>
>>  >>> isinstance(True, int)
>> True
>>
>> Huh?
>>     
>
> Yes. Do you have an actual question?
>
>
>   
>>  >>> issubclass(bool, int)
>> True
>>
>> Huh?!
>>     
>
> Exactly.
>
> Bools are a late-comer to Python. For historical and implementation 
> reasons, they are a subclass of int, because it was normal for people to 
> use 0 and 1 as boolean flags, and so making False == 0 and True == 1 was 
> the least likely to break code.
>
> E.g. back in the day, you would have something like:
>
> {2:None}.has_key(2) -> 1
>
> So folks would do:
>
> print "The key is", ["missing", "present"][d.has_key(key)]
>
> Which still works even now that has_key returns True or False rather than 
> 1 or 0.
>
>
>   
Despite there are good reasons for bool to be int, the newcomer 'wtf' 
reaction at first glance is legitimate.
Starting python from scratch, booleans would have not been a subclass of 
int (just guessing though), 'cause it makes no sense from a design POV.
Booleans are not ints, 0 does not *mean* False and veracity is not 
quantification.


JM


From darkrho at gmail.com  Fri Mar  5 14:01:23 2010
From: darkrho at gmail.com (Rolando Espinoza La Fuente)
Date: Fri, 5 Mar 2010 15:01:23 -0400
Subject: isinstance(False, int)
In-Reply-To: <hmrinv$ftq$1@dough.gmane.org>
References: <mailman.357.1267809307.23598.python-list@python.org> 
	<m2aaum1w8q.fsf@googlemail.com> <hmrinv$ftq$1@dough.gmane.org>
Message-ID: <4eca3f41003051101q4d2c6debo1c2701d924769b31@mail.gmail.com>

On Fri, Mar 5, 2010 at 2:32 PM, mk <mrkafk at gmail.com> wrote:
> Arnaud Delobelle wrote:
>
>>>>> 1 == True
>>
>> True
>>>>>
>>>>> 0 == False
>>
>> True
>>
>> So what's your question?
>
> Well nothing I'm just kind of bewildered: I'd expect smth like that in Perl,
> but not in Python.. Although I can understand the rationale after skimming
> PEP 285, I still don't like it very much.
>

So, the pythonic way to check for True/False should be:

>>> 1 is True
False

>>> 0 is False
False

instead of ==, right?

Regards,

Rolando


From robert.kern at gmail.com  Fri Mar  5 14:10:18 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 05 Mar 2010 13:10:18 -0600
Subject: Slicing [N::-1]
In-Reply-To: <4b914d35$0$27863$c3e8da3@news.astraweb.com>
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>	<m2wrxqzlhm.fsf@googlemail.com>
	<4b914d35$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <hmrkus$pn9$1@dough.gmane.org>

On 2010-03-05 12:28 PM, Steven D'Aprano wrote:
> On Fri, 05 Mar 2010 18:12:05 +0000, Arnaud Delobelle wrote:
>
>>>>> l = range(10)
>>>>> l
>> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>>>> l[7::-1]
>> [7, 6, 5, 4, 3, 2, 1, 0]
>>>>> [l[i] for i in range(7, -1, -1)]
>> [7, 6, 5, 4, 3, 2, 1, 0]
>
> Where does the first -1 come from? Slices are supposed to have default
> values of 0 and len(seq):

Rather, they have 0 and len(seq), respectively, when the step is positive, and 
len(seq)-1 and -1 when the step is negative.

>>>> l[7::1]
> [7, 8, 9]
>>>> [l[i] for i in range(7, len(l), 1)]
> [7, 8, 9]
>>>> [l[i] for i in range(7, len(l), -1)]
> []
>
>
> I don't believe the actual behaviour is documented anywhere.

True, I don't think it is.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From alfps at start.no  Fri Mar  5 14:13:23 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Fri, 05 Mar 2010 20:13:23 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <c1ecd9a2-9cdf-408d-9743-7e1dfa05bf47@q23g2000yqd.googlegroups.com>
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<mailman.209.1267635630.23598.python-list@python.org>
	<cf51c311-7354-4e89-ab2e-45bb8b66d67d@z35g2000yqd.googlegroups.com>
	<mailman.320.1267754017.23598.python-list@python.org>
	<c1ecd9a2-9cdf-408d-9743-7e1dfa05bf47@q23g2000yqd.googlegroups.com>
Message-ID: <hmrl4p$2je$1@news.eternal-september.org>

* Mike Kent:
> On Mar 4, 8:04 pm, Robert Kern <robert.k... at gmail.com> wrote:
> 
>> No, the try: finally: is not implicit. See the source for
>> contextlib.GeneratorContextManager. When __exit__() gets an exception from the
>> with: block, it will push it into the generator using its .throw() method. This
>> raises the exception inside the generator at the yield statement.
> 
> Wow, I just learned something new.  My understanding of context
> managers was that the __exit__ method was guaranteed to be executed
> regardless of how the context was left.  I have often written my own
> context manager classes, giving them the __enter__ and __exit__
> methods.  I had mistakenly assumed that the @contextmanager decorator
> turned a generator function into a context manager with the same
> behavior as the equivalent context manager class.  Now I learn that,
> no, in order to have the 'undo' code executed in the presence of an
> exception, you must write your own try/finally block in the generator
> function.
> 
> This raises the question in my mind: What's the use case for using
> @contextmanager rather than wrapping your code in a context manager
> class that defines __enter__ and __exit__, if you still have to
> manager your own try/finally block?

Robert Kern and Steve Howell have already given given good answers.

As it happened this was news to me also, because I'm not that well-versed in 
Python and it seems contrary to the purpose of providing a simpler way to write 
a simple init-cleanup wrapper.

But additionally, if you want that, then you can define it, e.g.


<code>
# Py3

def simplecleanup( generator_func ):
     class SimpleCleanup:
         def __init__( self, *args, **kwargs ):
             self.generator = generator_func( *args, **kwargs )

         def __enter__( self ):
             self.generator.send( None )
             return self

         def __exit__( self, x_type, x_obj, x_traceback ):
             try:
                 self.generator.send( x_obj )    # x_obj is None if no exception
             except StopIteration:
                 pass                            # Expected

     return SimpleCleanup


@simplecleanup
def hello_goodbye( name ):
     print( "Hello, {}!".format( name ) )
     yield
     print( "Goodbye {}!".format( name ) )


try:
     with hello_goodbye( "Mary" ):
         print( "Talk talk talk..." )
         raise RuntimeError( "Offense" )
except:
     pass
print()


@simplecleanup
def sensitive_hello_goodbye( name ):
     print( "Hello, {}!".format( name ) )
     x = yield
     if x is not None:
         print( "Uh oh, {}!".format( x ) )
         print( "Good day {}!".format( name ) )
     else:
         print( "C u, {}!".format( name ) )


try:
     with sensitive_hello_goodbye( "Jane" ):
         print( "Talk talk talk..." )
         raise RuntimeError( "Offense" )
except:
     pass
</code>


Cheers,

- Alf


From wongjoekmeu at yahoo.com  Fri Mar  5 14:21:32 2010
From: wongjoekmeu at yahoo.com (wongjoekmeu at yahoo.com)
Date: Fri, 5 Mar 2010 11:21:32 -0800 (PST)
Subject: start function in new process
Message-ID: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>

Hello all,

I would like to run a python function completely in a new process. For
example I have a parent process. That parent process needs to start a
child process in which the function is called. After the child process
is finished however I want that the child process should stop and then
only the parent process remain. When I start the function I want to
pass arguments also which include a function reference. I tried
os.fork() as I need to write it in linux. However it seems like the
child process remain alive. I discovered this when I loop through the
function. I see that the child process continue with the loop and
starts again a new grand child untill the loop is finished. See code
snippet. f() is the function I want to run in a new process. It got as
one of the input a refence to a function c().
Function g() I called in a loop for 3 times. Now it seems that when
child process get started in the function g() it return to the loop
and it calls g() itself and starts itself a nwe child process. I do
not want thant. I want the child process to perform the function f()
and just finished. Does anyone know how I can achieve this ?


def c():
    print "function c"

def f(a,b, d):
    # function I want to run in a new child process
    print a, b
    d()

def g():
    pidID = os.fork()
    if pidID == 0:
        # child do something here
        f(2,3,c)
    else:
        # parent do something here
        print "Parent

for i in range(3):
    g()





From pemerson at gmail.com  Fri Mar  5 14:24:44 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 11:24:44 -0800 (PST)
Subject: Conditional based on whether or not a module is being used
Message-ID: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>

In a module, how do I create a conditional that will do something
based on whether or not another module has been loaded?

Suppose I have the following:

import foo
import foobar

print foo()
print foobar()

########### foo.py
def foo:
    return 'foo'

########### foobar.py
def foobar:
    if foo.has_been_loaded(): # This is not right!
        return foo() + 'bar'      # This might need to be foo.foo() ?
    else:
        return 'bar'

If someone is using foo module, I want to take advantage of its
features and use it in foobar, otherwise, I want to do something else.
In other words, I don't want to create a dependency of foobar on foo.

My failed search for solving this makes me wonder if I'm approaching
this all wrong.

Thanks in advance,
Pete


From alfps at start.no  Fri Mar  5 14:34:00 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Fri, 05 Mar 2010 20:34:00 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <dc2f6b66-73af-4510-845c-b2d014c83520@b7g2000pro.googlegroups.com>
References: <hmlu55$n1s$1@news.eternal-september.org>
	<dc2f6b66-73af-4510-845c-b2d014c83520@b7g2000pro.googlegroups.com>
Message-ID: <hmrmbd$amv$1@news.eternal-september.org>

* Steve Howell:
> On Mar 3, 7:10 am, "Alf P. Steinbach" <al... at start.no> wrote:
>> For C++ Petru Marginean once invented the "scope guard" technique (elaborated on
>> by Andrei Alexandrescu, they published an article about it in DDJ) where all you
>> need to do to ensure some desired cleanup at the end of a scope, even when the
>> scope is exited via an exception, is to declare a ScopeGuard w/desired action.
>>
>> The C++ ScopeGuard was/is for those situations where you don't have proper
>> classes with automatic cleanup, which happily is seldom the case in good C++
>> code, but languages like Java and Python don't support automatic cleanup and so
>> the use case for something like ScopeGuard is ever present.
>>
>> For use with a 'with' statement and possibly suitable 'lambda' arguments:
>>
>> <code>
>> class Cleanup:
>>      def __init__( self ):
>>          self._actions = []
>>
>>      def call( self, action ):
>>          assert( is_callable( action ) )
>>          self._actions.append( action )
>>
>>      def __enter__( self ):
>>          return self
>>
>>      def __exit__( self, x_type, x_value, x_traceback ):
>>          while( len( self._actions ) != 0 ):
>>              try:
>>                  self._actions.pop()()
>>              except BaseException as x:
>>                  raise AssertionError( "Cleanup: exception during cleanup" ) from
>> </code>
>>
>> I guess the typical usage would be what I used it for, a case where the cleanup
>> action (namely, changing back to an original directory) apparently didn't fit
>> the standard library's support for 'with', like
>>
>>    with Cleanup as at_cleanup:
>>        # blah blah
>>        chdir( somewhere )
>>        at_cleanup.call( lambda: chdir( original_dir ) )
>>        # blah blah
>>
>> Another use case might be where one otherwise would get into very deep nesting
>> of 'with' statements with every nested 'with' at the end, like a degenerate tree
>> that for all purposes is a list. Then the above, or some variant, can help to
>> /flatten/ the structure. To get rid of that silly & annoying nesting. :-)
>>
>> Cheers,
>>
>> - Alf (just sharing, it's not seriously tested code)
> 
> Hi Alf, I think I understand the notion you're going after here.  You
> have multiple cleanup steps that you want to defer till the end, and
> there is some possibility that things will go wrong along the way, but
> you want to clean up as much as you can.  And, of course, flatter is
> better.
> 
> Is this sort of what you are striving for?
> 
>     class Cleanup:
>          def __init__( self ):
>              self._actions = []
> 
>          def call( self, action ):
>              self._actions.append( action )
> 
>          def __enter__( self ):
>              return self
> 
>          def __exit__( self, x_type, x_value, x_traceback ):
>              while( len( self._actions ) != 0 ):
>                  try:
>                      self._actions.pop()()
>                  except BaseException as x:
>                      raise AssertionError( "Cleanup: exception during
> cleanup" )
> 
>     def clean_the_floor():
>         print('clean the floor')
> 
>     def carouse(num_bottles, accident):
>         with Cleanup() as at_cleanup:
>             at_cleanup.call(clean_the_floor)
>             for i in range(num_bottles):
>                 def take_down(i=i):
>                     print('take one down', i)
>                 at_cleanup.call(take_down)
>                 if i == accident:
>                     raise Exception('oops!')
>                 print ('put bottle on wall', i)
> 
>     carouse(10, None)
>     carouse(5, 3)

He he.

I think you meant:

 >     def carouse(num_bottles, accident):
 >         with Cleanup() as at_cleanup:
 >             at_cleanup.call(clean_the_floor)
 >             for i in range(num_bottles):
 >                 def take_down(i=i):
 >                     print('take one down', i)
 >                 if i == accident:
 >                     raise Exception('oops!')
 >                 print ('put bottle on wall', i)
 >                 at_cleanup.call(take_down)

I'm not sure. It's interesting & fun. But hey, it's Friday evening.

Regarding the "clean the floor", Marginean's original ScopeGuard has a 'dismiss' 
method (great for e.g. implementing transactions). There's probably also much 
other such functionality that can be added.

The original use case for Cleanup, I just posted this in case people could find 
it useful, was a harness for testing that C++ code /fails/ as it should,
<url: http://pastebin.com/NK8yVcyv>, where Cleanup is used at line 479.

Some discussion of that in Usenet message and associated thread 
<hmmcdm$p1i$1 at news.eternal-september.org>, "Unit testing of expected failures -- 
what do you use?" in [comp.lang.c++].

Another similar approach was discussed by Carlo Milanesi in <url: 
http://www.drdobbs.com/cpp/205801074>, but he supplied this reference after I'd 
done the above. Mainly the difference is that he defines a custom mark-up 
language with corresponding source preprocessing, while I use the ordinary C++ 
preprocessor. There are advantages and disadvantages to both approaches.


Cheers,

- Alf


From pemerson at gmail.com  Fri Mar  5 14:39:41 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 11:39:41 -0800 (PST)
Subject: Conditional based on whether or not a module is being used
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
Message-ID: <63c618d8-3088-48fc-abbb-9eb06bb4eb54@f17g2000prh.googlegroups.com>

On Mar 5, 11:24?am, Pete Emerson <pemer... at gmail.com> wrote:
> In a module, how do I create a conditional that will do something
> based on whether or not another module has been loaded?
>
> Suppose I have the following:
>
> import foo
> import foobar
>
> print foo()
> print foobar()
>
> ########### foo.py
> def foo:
> ? ? return 'foo'
>
> ########### foobar.py
> def foobar:
> ? ? if foo.has_been_loaded(): # This is not right!
> ? ? ? ? return foo() + 'bar' ? ? ?# This might need to be foo.foo() ?
> ? ? else:
> ? ? ? ? return 'bar'
>
> If someone is using foo module, I want to take advantage of its
> features and use it in foobar, otherwise, I want to do something else.
> In other words, I don't want to create a dependency of foobar on foo.
>
> My failed search for solving this makes me wonder if I'm approaching
> this all wrong.
>
> Thanks in advance,
> Pete

Aha, progress. Comments appreciated. Perhaps there's a different and
more conventional way of doing it than this?

def foobar():
        import sys
        if 'foomodule' in sys.modules.keys():
                import foomodule
                return foomodule.foo() + 'bar'
        else:
                return 'bar'


From martin.hellwig at dcuktec.org  Fri Mar  5 14:40:25 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Fri, 05 Mar 2010 19:40:25 +0000
Subject: start function in new process
In-Reply-To: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>
References: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>
Message-ID: <hmrmn5$d74$1@news.eternal-september.org>

On 03/05/10 19:21, wongjoekmeu at yahoo.com wrote:
<cut os.fork problem>
Any specific reason why threading.Thread or multiprocessing is not 
suitable to solve your problem?

-- 
mph



From wongjoekmeu at yahoo.com  Fri Mar  5 14:45:53 2010
From: wongjoekmeu at yahoo.com (wongjoekmeu at yahoo.com)
Date: Fri, 5 Mar 2010 11:45:53 -0800 (PST)
Subject: start function in new process
References: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>
	<hmrmn5$d74$1@news.eternal-september.org>
Message-ID: <86d891a9-b6aa-4de9-a0f5-314867fdf75d@q21g2000yqm.googlegroups.com>

On 5 mrt, 20:40, "Martin P. Hellwig" <martin.hell... at dcuktec.org>
wrote:
> On 03/05/10 19:21, wongjoek... at yahoo.com wrote:
> <cut os.fork problem>
> Any specific reason why threading.Thread or multiprocessing is not
> suitable to solve your problem?
>
> --
> mph

Because I got a memory leak in my function f(). It uses scipy, numpy,
pylab, and I am not planning to solve the memory leak because its too
complicated. So I thought of just calling the function then when it is
finished the process is gone and all memory is released. With
threading I don't think I would solve this problem. I am not sure
though.


From mrkafk at gmail.com  Fri Mar  5 14:46:43 2010
From: mrkafk at gmail.com (mk)
Date: Fri, 05 Mar 2010 20:46:43 +0100
Subject: isinstance(False, int)
In-Reply-To: <4eca3f41003051027nb22f3daxc418eeda3ad0a83b@mail.gmail.com>
References: <hmre56$tvp$2@dough.gmane.org> <hmrgrg$8ok$1@dough.gmane.org>
	<4eca3f41003051027nb22f3daxc418eeda3ad0a83b@mail.gmail.com>
Message-ID: <hmrn32$20f$1@dough.gmane.org>

Rolando Espinoza La Fuente wrote:

> Doesn't have side effects not knowing  that False/True are ints?

It does, in fact I was wondering why my iterator didn't work until I 
figured issubclass(bool, int) is true.

Regards,
mk



From steve at holdenweb.com  Fri Mar  5 14:51:39 2010
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 05 Mar 2010 14:51:39 -0500
Subject: Conditional based on whether or not a module is being used
In-Reply-To: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
Message-ID: <hmrncj$2ih$1@dough.gmane.org>

Pete Emerson wrote:
> In a module, how do I create a conditional that will do something
> based on whether or not another module has been loaded?
> 
> Suppose I have the following:
> 
> import foo
> import foobar
> 
> print foo()
> print foobar()
> 
> ########### foo.py
> def foo:
>     return 'foo'
> 
> ########### foobar.py
> def foobar:
>     if foo.has_been_loaded(): # This is not right!
>         return foo() + 'bar'      # This might need to be foo.foo() ?
>     else:
>         return 'bar'
> 
> If someone is using foo module, I want to take advantage of its
> features and use it in foobar, otherwise, I want to do something else.
> In other words, I don't want to create a dependency of foobar on foo.
> 
> My failed search for solving this makes me wonder if I'm approaching
> this all wrong.
> 
> Thanks in advance,
> Pete

One way would be

    if "foo" in sys.modules:
        # foo was imported

However that won't get you all the way, since sys.modules["foo"] will be
set even if the importing statement was

    from foo import this, that, the_other

So you might want to add

    foo = sys.modules["foo"]

inside the function.

regards
 Steve

-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Fri Mar  5 14:52:46 2010
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 05 Mar 2010 14:52:46 -0500
Subject: Conditional based on whether or not a module is being used
In-Reply-To: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
Message-ID: <hmrnen$2ih$2@dough.gmane.org>

Pete Emerson wrote:
> In a module, how do I create a conditional that will do something
> based on whether or not another module has been loaded?
> 
> Suppose I have the following:
> 
> import foo
> import foobar
> 
> print foo()
> print foobar()
> 
By the way, the above statements are never going to work, because
modules aren't callable. Maybe you want

print foo.foo()
print foobar.foobar()

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at REMOVE-THIS-cybersource.com.au  Fri Mar  5 14:53:43 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 19:53:43 GMT
Subject: Conditional based on whether or not a module is being used
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
Message-ID: <4b916146$0$27863$c3e8da3@news.astraweb.com>

On Fri, 05 Mar 2010 11:24:44 -0800, Pete Emerson wrote:

> In a module, how do I create a conditional that will do something based
> on whether or not another module has been loaded?

try:
    import foo
except ImportError:
    foo = None

def function():
    if foo:
        return foo.func()
    else:
        do_something_else()



Or, alternatively:

try:
    import foo
except ImportError:
    import alternative_foo as foo  # This better succeed!

def function():
    return foo.func()


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Fri Mar  5 14:54:22 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 19:54:22 GMT
Subject: isinstance(False, int)
References: <mailman.357.1267809307.23598.python-list@python.org>
	<m2aaum1w8q.fsf@googlemail.com> <hmrinv$ftq$1@dough.gmane.org>
	<mailman.370.1267815705.23598.python-list@python.org>
Message-ID: <4b91616d$0$27863$c3e8da3@news.astraweb.com>

On Fri, 05 Mar 2010 15:01:23 -0400, Rolando Espinoza La Fuente wrote:

> On Fri, Mar 5, 2010 at 2:32 PM, mk <mrkafk at gmail.com> wrote:
>> Arnaud Delobelle wrote:
>>
>>>>>> 1 == True
>>>
>>> True
>>>>>>
>>>>>> 0 == False
>>>
>>> True
>>>
>>> So what's your question?
>>
>> Well nothing I'm just kind of bewildered: I'd expect smth like that in
>> Perl, but not in Python.. Although I can understand the rationale after
>> skimming PEP 285, I still don't like it very much.
>>
>>
> So, the pythonic way to check for True/False should be:
> 
>>>> 1 is True
> False

Why do you need to check for True/False? 

But if you need to, yes, that is one way. Another would be:

isinstance(flag, bool)

But generally, you can use any object as a flag without caring if it is 
actually True or False.




-- 
Steven


From mrkafk at gmail.com  Fri Mar  5 14:55:14 2010
From: mrkafk at gmail.com (mk)
Date: Fri, 05 Mar 2010 20:55:14 +0100
Subject: imap vs map
Message-ID: <hmrnj1$475$1@dough.gmane.org>

Hello everyone,

I re-wrote more "slowly" an example at the end of 
http://wordaligned.org/articles/essential-python-reading-list


This example finds anagrams in the text file.

====
from itertools import groupby, imap
from operator import itemgetter

from string import ascii_lowercase, ascii_uppercase, punctuation, 
maketrans, translate

data = open(r"c:\temp\words.txt", "rt").read()

trtable = maketrans(ascii_uppercase, ascii_lowercase)

words = translate(data, trtable, deletions = punctuation)

words = list(set(words.split()))

sw = sorted(words, key=sorted)

gb = groupby(sw, sorted)

print map(list, imap(itemgetter(1), gb))
===

words.txt:
===
Word Aligned
three
space sensitive programming
Feed Logo tins
Essential Python post  Reading List
stop course there
times isnt
capes
===

Now, when I execute above, it works:

[['capes', 'space'], ['aligned'], ['reading'], ['essential'], 
['programming'], ['course'], ['feed'], ['word'], ['there', 'three'], 
['sensitive'], ['times'], ['logo'], ['python'], ['list'], ['isnt', 
'tins'], ['stop', 'post']]


However, when I change the last line to:

print map(list, map(itemgetter(1), gb))

It stops working:

[[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], ['post']]

Why? I was under impression that the only difference between map and 
imap is that imap returns iterator allowing to produce a list, while map 
returns equivalent list?

Regards,
mk





From python at mrabarnett.plus.com  Fri Mar  5 14:57:34 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Fri, 05 Mar 2010 19:57:34 +0000
Subject: Conditional based on whether or not a module is being used
In-Reply-To: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
Message-ID: <4B91622E.5000208@mrabarnett.plus.com>

Pete Emerson wrote:
> In a module, how do I create a conditional that will do something
> based on whether or not another module has been loaded?
> 
> Suppose I have the following:
> 
> import foo
> import foobar
> 
> print foo()
> print foobar()
> 
> ########### foo.py
> def foo:
>     return 'foo'
> 
> ########### foobar.py
> def foobar:
>     if foo.has_been_loaded(): # This is not right!
>         return foo() + 'bar'      # This might need to be foo.foo() ?
>     else:
>         return 'bar'
> 
> If someone is using foo module, I want to take advantage of its
> features and use it in foobar, otherwise, I want to do something else.
> In other words, I don't want to create a dependency of foobar on foo.
> 
> My failed search for solving this makes me wonder if I'm approaching
> this all wrong.
> 
Look for its name in sys.modules, for example:

     'foo' in sys.modules


From martin.hellwig at dcuktec.org  Fri Mar  5 15:02:34 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Fri, 05 Mar 2010 20:02:34 +0000
Subject: start function in new process
In-Reply-To: <86d891a9-b6aa-4de9-a0f5-314867fdf75d@q21g2000yqm.googlegroups.com>
References: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>
	<hmrmn5$d74$1@news.eternal-september.org>
	<86d891a9-b6aa-4de9-a0f5-314867fdf75d@q21g2000yqm.googlegroups.com>
Message-ID: <hmro0l$lld$1@news.eternal-september.org>

On 03/05/10 19:45, wongjoekmeu at yahoo.com wrote:
> On 5 mrt, 20:40, "Martin P. Hellwig"<martin.hell... at dcuktec.org>
> wrote:
>> On 03/05/10 19:21, wongjoek... at yahoo.com wrote:
>> <cut os.fork problem>
>> Any specific reason why threading.Thread or multiprocessing is not
>> suitable to solve your problem?
>>
>> --
>> mph
>
> Because I got a memory leak in my function f(). It uses scipy, numpy,
> pylab, and I am not planning to solve the memory leak because its too
> complicated. So I thought of just calling the function then when it is
> finished the process is gone and all memory is released. With
> threading I don't think I would solve this problem. I am not sure
> though.

I would be surprised if you can't do the same with 
subprocess/multiprocessing, since you seem to know how to identify the 
memory leak it shouldn't be a problem scripting out a test to see if it 
works this way. I would be interested though in your findings.

-- 
mph


From martin.hellwig at dcuktec.org  Fri Mar  5 15:06:09 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Fri, 05 Mar 2010 20:06:09 +0000
Subject: Conditional based on whether or not a module is being used
In-Reply-To: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
Message-ID: <hmro7c$lld$2@news.eternal-september.org>

On 03/05/10 19:24, Pete Emerson wrote:
> In a module, how do I create a conditional that will do something
> based on whether or not another module has been loaded?
<cut>>
> If someone is using foo module, I want to take advantage of its
> features and use it in foobar, otherwise, I want to do something else.
> In other words, I don't want to create a dependency of foobar on foo.
>
> My failed search for solving this makes me wonder if I'm approaching
> this all wrong.
>
> Thanks in advance,
> Pete

Hmm how about the module is available, just not imported yet, I would 
assume that you still would like to use the module then.
Perhaps playing around with the imp module might get you what you mean 
instead of what you say?

-- 
mph



From wongjoekmeu at yahoo.com  Fri Mar  5 15:09:39 2010
From: wongjoekmeu at yahoo.com (wongjoekmeu at yahoo.com)
Date: Fri, 5 Mar 2010 12:09:39 -0800 (PST)
Subject: start function in new process
References: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>
	<hmrmn5$d74$1@news.eternal-september.org>
	<86d891a9-b6aa-4de9-a0f5-314867fdf75d@q21g2000yqm.googlegroups.com>
	<hmro0l$lld$1@news.eternal-september.org>
Message-ID: <3f2cc4f0-b21a-4886-a81c-5b503610ac2d@e7g2000yqf.googlegroups.com>

On 5 mrt, 21:02, "Martin P. Hellwig" <martin.hell... at dcuktec.org>
wrote:
> On 03/05/10 19:45, wongjoek... at yahoo.com wrote:
>
>
>
> > On 5 mrt, 20:40, "Martin P. Hellwig"<martin.hell... at dcuktec.org>
> > wrote:
> >> On 03/05/10 19:21, wongjoek... at yahoo.com wrote:
> >> <cut os.fork problem>
> >> Any specific reason why threading.Thread or multiprocessing is not
> >> suitable to solve your problem?
>
> >> --
> >> mph
>
> > Because I got a memory leak in my function f(). It uses scipy, numpy,
> > pylab, and I am not planning to solve the memory leak because its too
> > complicated. So I thought of just calling the function then when it is
> > finished the process is gone and all memory is released. With
> > threading I don't think I would solve this problem. I am not sure
> > though.
>
> I would be surprised if you can't do the same with
> subprocess/multiprocessing, since you seem to know how to identify the
> memory leak it shouldn't be a problem scripting out a test to see if it
> works this way. I would be interested though in your findings.
>
> --
> mph

I can't use multiprocessing module since it comes only with python 2.6
and I am bound to python2.4. But subprocess does exist in python2.4,
but the question now is, how do I achieve that ? Any example ?


From clp2 at rebertia.com  Fri Mar  5 15:17:58 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 5 Mar 2010 12:17:58 -0800
Subject: Conditional based on whether or not a module is being used
In-Reply-To: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
Message-ID: <50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com>

On 3/5/10, Pete Emerson <pemerson at gmail.com> wrote:
> In a module, how do I create a conditional that will do something
> based on whether or not another module has been loaded?
>
> Suppose I have the following:
>
> import foo
> import foobar
>
> print foo()
> print foobar()
>
> ########### foo.py
> def foo:
>    return 'foo'
>
> ########### foobar.py
> def foobar:
>    if foo.has_been_loaded(): # This is not right!
>        return foo() + 'bar'      # This might need to be foo.foo() ?
>    else:
>        return 'bar'
>
> If someone is using foo module, I want to take advantage of its
> features and use it in foobar, otherwise, I want to do something else.
> In other words, I don't want to create a dependency of foobar on foo.
>
> My failed search for solving this makes me wonder if I'm approaching
> this all wrong.

Just try importing foo, and then catch the exception if it's not installed.

#foobar.py
try:
    import foo
except ImportError:
    FOO_PRESENT = False
else:
    FOO_PRESENT = True

if FOO_PRESENT:
    def foobar():
        return foo.foo() + 'bar'
else:
    def foobar():
        return 'bar'


You could alternately do the `if FOO_PRESENT` check inside the
function body rather than defining separate versions of the function.

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


From earnmoney9421 at gmail.com  Fri Mar  5 15:20:23 2010
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From pemerson at gmail.com  Fri Mar  5 15:25:37 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 12:25:37 -0800
Subject: Conditional based on whether or not a module is being used
In-Reply-To: <50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com>
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
	<50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com>
Message-ID: <14a5cd5e1003051225j1d596aa2nfe9eb1047037f19d@mail.gmail.com>

On Fri, Mar 5, 2010 at 12:17 PM, Chris Rebert <clp2 at rebertia.com> wrote:
> On 3/5/10, Pete Emerson <pemerson at gmail.com> wrote:
>> In a module, how do I create a conditional that will do something
>> based on whether or not another module has been loaded?
>>
>> Suppose I have the following:
>>
>> import foo
>> import foobar
>>
>> print foo()
>> print foobar()
>>
>> ########### foo.py
>> def foo:
>> ? ?return 'foo'
>>
>> ########### foobar.py
>> def foobar:
>> ? ?if foo.has_been_loaded(): # This is not right!
>> ? ? ? ?return foo() + 'bar' ? ? ?# This might need to be foo.foo() ?
>> ? ?else:
>> ? ? ? ?return 'bar'
>>
>> If someone is using foo module, I want to take advantage of its
>> features and use it in foobar, otherwise, I want to do something else.
>> In other words, I don't want to create a dependency of foobar on foo.
>>
>> My failed search for solving this makes me wonder if I'm approaching
>> this all wrong.
>
> Just try importing foo, and then catch the exception if it's not installed.
>
> #foobar.py
> try:
> ? ?import foo
> except ImportError:
> ? ?FOO_PRESENT = False
> else:
> ? ?FOO_PRESENT = True
>
> if FOO_PRESENT:
> ? ?def foobar():
> ? ? ? ?return foo.foo() + 'bar'
> else:
> ? ?def foobar():
> ? ? ? ?return 'bar'
>
>
> You could alternately do the `if FOO_PRESENT` check inside the
> function body rather than defining separate versions of the function.
>
> Cheers,
> Chris
> --
> http://blog.rebertia.com
>

Except I want to use the module only if the main program is using it
too, not just if it's available for use. I think that I found a way in
my follow-up post to my own message, but not sure it's the best way or
conventional.

Pete


From pemerson at gmail.com  Fri Mar  5 15:31:16 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 12:31:16 -0800 (PST)
Subject: Conditional based on whether or not a module is being used
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
	<hmro7c$lld$2@news.eternal-september.org>
Message-ID: <9769b00a-8d85-43ed-98e9-f921dc71c217@s36g2000prh.googlegroups.com>

On Mar 5, 12:06?pm, "Martin P. Hellwig" <martin.hell... at dcuktec.org>
wrote:
> On 03/05/10 19:24, Pete Emerson wrote:
>
> > In a module, how do I create a conditional that will do something
> > based on whether or not another module has been loaded?
> <cut>>
> > If someone is using foo module, I want to take advantage of its
> > features and use it in foobar, otherwise, I want to do something else.
> > In other words, I don't want to create a dependency of foobar on foo.
>
> > My failed search for solving this makes me wonder if I'm approaching
> > this all wrong.
>
> > Thanks in advance,
> > Pete
>
> Hmm how about the module is available, just not imported yet, I would
> assume that you still would like to use the module then.
> Perhaps playing around with the imp module might get you what you mean
> instead of what you say?
>
> --
> mph

I can certainly see why one might want to use it if it's available but
not yet imported. In that case I could do a try / exception block. But
in this case, I actually don't want to use the module unless the main
program is doing it too. But you've got me thinking, I need to make
sure that's really the desired behavior.

Pete


From pemerson at gmail.com  Fri Mar  5 15:31:40 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 12:31:40 -0800 (PST)
Subject: Conditional based on whether or not a module is being used
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
	<mailman.376.1267819057.23598.python-list@python.org>
Message-ID: <ec8e0912-bc85-4c51-85f5-fc855e289c1c@k6g2000prg.googlegroups.com>

On Mar 5, 11:57?am, MRAB <pyt... at mrabarnett.plus.com> wrote:
> Pete Emerson wrote:
> > In a module, how do I create a conditional that will do something
> > based on whether or not another module has been loaded?
>
> > Suppose I have the following:
>
> > import foo
> > import foobar
>
> > print foo()
> > print foobar()
>
> > ########### foo.py
> > def foo:
> > ? ? return 'foo'
>
> > ########### foobar.py
> > def foobar:
> > ? ? if foo.has_been_loaded(): # This is not right!
> > ? ? ? ? return foo() + 'bar' ? ? ?# This might need to be foo.foo() ?
> > ? ? else:
> > ? ? ? ? return 'bar'
>
> > If someone is using foo module, I want to take advantage of its
> > features and use it in foobar, otherwise, I want to do something else.
> > In other words, I don't want to create a dependency of foobar on foo.
>
> > My failed search for solving this makes me wonder if I'm approaching
> > this all wrong.
>
> Look for its name in sys.modules, for example:
>
> ? ? ?'foo' in sys.modules

Excellent, this is what I finally discovered, although I was looking
for 'foo' in sys.modules.keys(), which apparently isn't necessary.


From jgardner at jonathangardner.net  Fri Mar  5 15:39:58 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Fri, 5 Mar 2010 12:39:58 -0800
Subject: start function in new process
In-Reply-To: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>
References: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>
Message-ID: <6cc20cea1003051239h2983a3cbw68f54bcf547367a8@mail.gmail.com>

You're really close. See inline comment below.

On Fri, Mar 5, 2010 at 11:21 AM, wongjoekmeu at yahoo.com
<wongjoekmeu at yahoo.com> wrote:
>
> def c():
> ? ?print "function c"
>
> def f(a,b, d):
> ? ?# function I want to run in a new child process
> ? ?print a, b
> ? ?d()
>
> def g():
> ? ?pidID = os.fork()
> ? ?if pidID == 0:
> ? ? ? ?# child do something here
> ? ? ? ?f(2,3,c)

You'll need to exit here -- not return.
http://docs.python.org/library/os.html#os._exit

> ? ?else:
> ? ? ? ?# parent do something here
> ? ? ? ?print "Parent
>
> for i in range(3):
> ? ?g()
>

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From martin.hellwig at dcuktec.org  Fri Mar  5 15:40:55 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Fri, 05 Mar 2010 20:40:55 +0000
Subject: start function in new process
In-Reply-To: <3f2cc4f0-b21a-4886-a81c-5b503610ac2d@e7g2000yqf.googlegroups.com>
References: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>
	<hmrmn5$d74$1@news.eternal-september.org>
	<86d891a9-b6aa-4de9-a0f5-314867fdf75d@q21g2000yqm.googlegroups.com>
	<hmro0l$lld$1@news.eternal-september.org>
	<3f2cc4f0-b21a-4886-a81c-5b503610ac2d@e7g2000yqf.googlegroups.com>
Message-ID: <hmrq8j$3n8$1@news.eternal-september.org>

On 03/05/10 20:09, wongjoekmeu at yahoo.com wrote:
> On 5 mrt, 21:02, "Martin P. Hellwig"<martin.hell... at dcuktec.org>
> wrote:
>> On 03/05/10 19:45, wongjoek... at yahoo.com wrote:
>>
>>
>>
>>> On 5 mrt, 20:40, "Martin P. Hellwig"<martin.hell... at dcuktec.org>
>>> wrote:
>>>> On 03/05/10 19:21, wongjoek... at yahoo.com wrote:
>>>> <cut os.fork problem>
>>>> Any specific reason why threading.Thread or multiprocessing is not
>>>> suitable to solve your problem?
>>
>>>> --
>>>> mph
>>
>>> Because I got a memory leak in my function f(). It uses scipy, numpy,
>>> pylab, and I am not planning to solve the memory leak because its too
>>> complicated. So I thought of just calling the function then when it is
>>> finished the process is gone and all memory is released. With
>>> threading I don't think I would solve this problem. I am not sure
>>> though.
>>
>> I would be surprised if you can't do the same with
>> subprocess/multiprocessing, since you seem to know how to identify the
>> memory leak it shouldn't be a problem scripting out a test to see if it
>> works this way. I would be interested though in your findings.
>>
>> --
>> mph
>
> I can't use multiprocessing module since it comes only with python 2.6
> and I am bound to python2.4. But subprocess does exist in python2.4,
> but the question now is, how do I achieve that ? Any example ?

Sure, for example if I want to check the openssl version (didn't specify 
I need to provide a useful example :-)

I would normally do on the command line:
[martin at aspire8930 /usr/home/martin/Desktop]$ /usr/bin/openssl version
OpenSSL 0.9.8k 25 Mar 2009

The python subprocess equivalent is:
[martin at aspire8930 /usr/home/martin/Desktop]$ python
Python 2.6.4 (r264:75706, Jan 31 2010, 20:52:16)
[GCC 4.2.1 20070719  [FreeBSD]] on freebsd8
Type "help", "copyright", "credits" or "license" for more information.
 >>> import subprocess as _sp
 >>> ssl_version = _sp.Popen(['/usr/bin/openssl', 'version'], 
stdout=_sp.PIPE)
 >>> print(ssl_version.stdout.readlines())
['OpenSSL 0.9.8k 25 Mar 2009\n']
 >>> quit()
[martin at aspire8930 /usr/home/martin/Desktop]$

If you get any error in the Popen part, you probably did not use the 
full path or an illegal parameter.

If you get a long wait in the readlines part, this usually means that 
there is either nothing written to stdout or something is still being 
written (I am not sure about this part though, it has been a while).

hth
-- 
mph


From robert.kern at gmail.com  Fri Mar  5 15:49:40 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 05 Mar 2010 14:49:40 -0600
Subject: start function in new process
In-Reply-To: <3f2cc4f0-b21a-4886-a81c-5b503610ac2d@e7g2000yqf.googlegroups.com>
References: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>	<hmrmn5$d74$1@news.eternal-september.org>	<86d891a9-b6aa-4de9-a0f5-314867fdf75d@q21g2000yqm.googlegroups.com>	<hmro0l$lld$1@news.eternal-september.org>
	<3f2cc4f0-b21a-4886-a81c-5b503610ac2d@e7g2000yqf.googlegroups.com>
Message-ID: <hmrqp4$fk3$1@dough.gmane.org>

On 2010-03-05 14:09 PM, wongjoekmeu at yahoo.com wrote:

> I can't use multiprocessing module since it comes only with python 2.6
> and I am bound to python2.4.

It is available as a third party package for Python 2.4:

http://pypi.python.org/pypi/multiprocessing

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From jackdied at gmail.com  Fri Mar  5 15:58:01 2010
From: jackdied at gmail.com (Jack Diederich)
Date: Fri, 5 Mar 2010 15:58:01 -0500
Subject: isinstance(False, int)
In-Reply-To: <4b91616d$0$27863$c3e8da3@news.astraweb.com>
References: <mailman.357.1267809307.23598.python-list@python.org>
	<m2aaum1w8q.fsf@googlemail.com> <hmrinv$ftq$1@dough.gmane.org>
	<mailman.370.1267815705.23598.python-list@python.org>
	<4b91616d$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <b8e622741003051258n29394b93q5382421fc496a82f@mail.gmail.com>

On Fri, Mar 5, 2010 at 2:54 PM, Steven D'Aprano
<steve at remove-this-cybersource.com.au> wrote:
> On Fri, 05 Mar 2010 15:01:23 -0400, Rolando Espinoza La Fuente wrote:
>
>> On Fri, Mar 5, 2010 at 2:32 PM, mk <mrkafk at gmail.com> wrote:
>>> Arnaud Delobelle wrote:
>>>
>>>>>>> 1 == True
>>>>
>>>> True
>>>>>>>
>>>>>>> 0 == False
>>>>
>>>> True
>>>>
>>>> So what's your question?
>>>
>>> Well nothing I'm just kind of bewildered: I'd expect smth like that in
>>> Perl, but not in Python.. Although I can understand the rationale after
>>> skimming PEP 285, I still don't like it very much.
>>>
>>>
>> So, the pythonic way to check for True/False should be:
>>
>>>>> 1 is True
>> False
>
> Why do you need to check for True/False?
>

You should never check for "is" False/True but always check for
equality.  The reason is that many types support the equality (__eq__)
and boolen (__bool__ in 3x) protocols.  If you check equality these
will be invoked, if you check identity ("is") they won't.

-Jack


From info at wingware.com  Fri Mar  5 16:00:48 2010
From: info at wingware.com (Wingware)
Date: Fri, 05 Mar 2010 16:00:48 -0500
Subject: ANN: Wing IDE 3.2.5 Released
Message-ID: <4B917100.9000401@wingware.com>

Hi,

Wingware has released version 3.2.5 of Wing IDE, an integrated development
environment designed specifically for the Python programming language.

Wing IDE provides a professional code editor with vi, emacs, and other
configurable key bindings, auto-completion, call tips, a powerful graphical
debugger, integrated version control and unit testing, search, and many
other features.  The IDE runs on Windows, Linux, and OS X and can be used
to develop Python code for web, GUI, and embedded scripting applications.

This release includes the following minor features and improvements:

* Several vi and brief keyboard mode fixes (see change log for details)
* Support recent git versions
* Fixed output buffering on OS X for debug process and in OS Commands
* Fixed debugger support for Stackless 3.0 and 3.1
* Improve input() handling and other debugger support for Python 3.x
* Iterator support for sys.stdin
* Avoid losing focus on Debug Probe when stepping in debugger
* Fix potential for crashing debug process on certain file names
* Don't crash when copying non-ascii text in OS command output
* Added delete, duplicate, and swap line operations to Source menu
* Added rename-current-file command
* Many other minor features and bug fixes; See the change log
   at http://wingware.com/pub/wingide/3.2.5/CHANGELOG.txt for details

*Wing 3.2 Highlights*

Versions 3.2.x of Wing IDE include the following new features not present
in version 3.1:

* Support for Python 3.0 and 3.1
* Rewritten version control integration with support for Subversion, CVS,
   Bazaar, git, Mercurial, and Perforce (*)
* Added 64-bit Debian, RPM, and tar file installers for Linux
* File management in Project view (**)
* Auto-completion in the editor obtains completion data from live runtime
   when the debugger is active (**)
* Perspectives: Create and save named GUI layouts and optionally 
automatically
   transition when debugging is started (*)
* Improved support for Cython and Pyrex (*.pyx files)
* Added key binding documentation to the manual
* Added Restart Debugging item in Debug menu and tool bar (**)
* Improved OS Commands and Bookmarks tools (*)
* Support for debugging 64-bit Python on OS X

(*)'d items are available in Wing IDE Professional only.
(**)'d items are available in Wing IDE Personal and Professional only.

The release also contains many other minor features and bug fixes; see the
change log for details: http://wingware.com/pub/wingide/3.2.5/CHANGELOG.txt

*Downloads*

Wing IDE Professional and Wing IDE Personal are commercial software and
require a license to run.  A free trial license can be obtained directly 
from
the product when launched.  Wing IDE 101 can be used free of charge.

Wing IDE Pro 3.2.5        http://wingware.com/downloads/wingide/3.2

Wing IDE Personal 3.2.5   http://wingware.com/downloads/wingide-personal/3.2

Wing IDE 101 3.2.5        http://wingware.com/downloads/wingide-101/3.2

*About Wing IDE*

Wing IDE is an integrated development environment for the Python programming
language.  It provides powerful debugging, editing, code intelligence,
testing, version control, and search capabilities that reduce 
development and
debugging time, cut down on coding errors, and make it easier to understand
and navigate Python code.

Wing IDE is available in three product levels:  Wing IDE Professional is
the full-featured Python IDE, Wing IDE Personal offers a reduced feature
set at a low price, and Wing IDE 101 is a free simplified version designed
for teaching entry level programming courses with Python.

System requirements are Windows 2000 or later, OS X 10.3.9 or later for 
PPC or
Intel (requires X11 Server), or a recent Linux system (either 32 or 64 bit).
Wing IDE 3.2 supports Python versions 2.0.x through 3.1.x.

*Purchasing and Upgrading*

Wing 3.2 is a free upgrade for all Wing IDE 3.0 and 3.1 users. Version 2.x
licenses cost 1/2 the normal price to upgrade.

Upgrade a 2.x license:     https://wingware.com/store/upgrade

Purchase a 3.x license:    https://wingware.com/store/purchase

-- 

The Wingware Team
Wingware | Python IDE
Advancing Software Development

www.wingware.com



From clp2 at rebertia.com  Fri Mar  5 16:14:53 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 5 Mar 2010 13:14:53 -0800
Subject: Conditional based on whether or not a module is being used
In-Reply-To: <14a5cd5e1003051225j1d596aa2nfe9eb1047037f19d@mail.gmail.com>
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
	<50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com>
	<14a5cd5e1003051225j1d596aa2nfe9eb1047037f19d@mail.gmail.com>
Message-ID: <50697b2c1003051314p6d69eb41hbc407f7cf7e8866@mail.gmail.com>

On Fri, Mar 5, 2010 at 12:25 PM, Pete Emerson <pemerson at gmail.com> wrote:
> On Fri, Mar 5, 2010 at 12:17 PM, Chris Rebert <clp2 at rebertia.com> wrote:
>> On 3/5/10, Pete Emerson <pemerson at gmail.com> wrote:
>>> In a module, how do I create a conditional that will do something
>>> based on whether or not another module has been loaded?
<snip>
>>> If someone is using foo module, I want to take advantage of its
>>> features and use it in foobar, otherwise, I want to do something else.
>>> In other words, I don't want to create a dependency of foobar on foo.
>>>
>>> My failed search for solving this makes me wonder if I'm approaching
>>> this all wrong.
>>
>> Just try importing foo, and then catch the exception if it's not installed.
<snip>
> Except I want to use the module only if the main program is using it
> too, not just if it's available for use. I think that I found a way in
> my follow-up post to my own message, but not sure it's the best way or
> conventional.

What is your use case for this behavior exactly? You've piqued my curiosity.

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


From tjreedy at udel.edu  Fri Mar  5 16:25:46 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 05 Mar 2010 16:25:46 -0500
Subject: Generic singleton
In-Reply-To: <4b9146e6$0$27863$c3e8da3@news.astraweb.com>
References: <mailman.222.1267642515.23598.python-list@python.org>	<pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>	<Xns9D317DB33C63Aduncanbooth@127.0.0.1>	<4b907b5e$0$27863$c3e8da3@news.astraweb.com>	<mailman.354.1267808250.23598.python-list@python.org>
	<4b9146e6$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <hmrssp$nes$1@dough.gmane.org>

On 3/5/2010 1:01 PM, Steven D'Aprano wrote:
> On Fri, 05 Mar 2010 11:57:13 -0500, Terry Reedy wrote:
>
>> On 3/4/2010 10:32 PM, Steven D'Aprano wrote:
>>
>>> Python does have it's own singletons, like None, True and False.
>>
>> True and False are not singletons.
>
> Duotons? Doubletons?

The latter is what I use.
>
>>>> t1 = bool(1)
>>>> t2 = bool(1)
>>>> t1 is t2
> True
>>>> t1 is t2 is bool("this is also true") is bool(['so', 'is', 'this'])
> True
>
> They're described as singletons in the PEP, so if you want to argue with
> Guido, go right ahead... *grin*
> http://www.python.org/dev/peps/pep-0285/

Guido already made the argument ;-) when he followed
'The values False and True will be singletons, like None.'
with 'Because the type has two values, perhaps these should be called 
"doubletons"? '. I agree with him here.

By 'singleton', I believe he meant 'keyword constants' with guaranteed 
'isness'. Ie, "True is True' and 'False is False', like 'None is None', 
are guaranteed in the language def to be true (True) whereas '0 is 0' 
and "'' is ''" and '() is ()' are not, even if they happen to be in a 
particular implementation.

None of this determine the behavior of the respective null and boolean 
classes. If Python had the strict bools that some wanted, bool(x) would 
not be legal.

>>   >  For some reason, they behave quite differently:
>>
>> Because they are quite different.
>
> Well, list("hello world") and list("goodbye now") are quite different
> too, but they behave very similarly.
>
>
>>   >  NoneType fails if you try to instantiate it again,
>>
>> Because trying 'type(None)()' was probably judged to be more likely to
>> be a bug than something useful.

> Obviously people are unlikely to write type(None)(), but they are likely
> to do something like:
>
> result = call_some_function(args)
> more_code_here()
> blah_blah_blah()
> new_obj = type(result)()
> do_something_with(new_obj)
>
> If result happens to end up being None, I'm not convinced that the caller
> would rather have an exception than get the obvious None. If result
> happened to be 0, wouldn't you rather get 0 than have it blow up? I don't
> see why None should be any different.

This is your strongest argument. It has nothing to do in particular with 
(the dubious analogy with) bool. Here is a draft of what you might post 
to python-ideas list, or even the tracker.

"
Make type(None) return None

The built-in classes of CPython nearly all follow the (undocumented?) 
design rule that if class C has a null instance, C() returns that 
(usually unique) null (False) instance. Hence, for instance, one can write

nulls = [type(x)() for x in obs]

to map the objects in obs to their null counterparts. This works for 
object of at least the following classes: bool, int, float, complex, 
str, bytes, bytearray, tuple, list, set, frozenset, dict, 
decimal.Decimal, fractions.Fraction, collections.deque, and 
collections.defaultdict.

The one glaring exception is type(None), which raises a TypeError 
instead of returning the null value None. This anomaly could be easily 
corrected, and the rule documented in, for instance, Lib Ref 5.1. Truth 
Value Testing.

Possible objection 1: None is a special singleton.
Answer 1: False is special too, and 'bool() is False' is true.

Possible objection 2: code that depends on no return would break.
Answer 2: at least one other class was changed during the 2.x series to 
conform to the rule. (xxx which?)
"

I am pretty sure other classes *were* changed, but cannot specifically 
remember which. I would look a bit at the tracker and archives for any 
negative pronouncements between posting.

>>   >  while bool returns the appropriate existing singleton: [sic]
>>
>> Branching on boolean values (which are no more singletons than 0, 1,
>> ...) is basic to computing.
>
> What does that have to do with the price of fish? I didn't mention
> anything about branching on bools.

Every use of 'if', 'and', and 'or' implicitly calls bool, and people 
often call it explicitly. There is almost no use case, other than such 
as the above, for calling the type of None.

> Once a singleton class has been instantiated the first time, you have a
> choice if the user tries to instantiate it again. You can do what
> NoneType does, and raise an error. Or you can do what bool does, and
> return the existing instance.
>
> Obviously, the behaviour of bool is far more useful.

The behavior of bool is necessary.

> So I wonder why NoneType doesn't do the same.

It predated bool by at least a decade.
The choice was pretty inconsequential, especially then, either way.

>>> I wonder why NoneType doesn't just return None?
>>
>> What would you have NoneType(x) do?
>
> The same thing any function of zero arguments does when it gets called
> with one argument.
>
>> Or the special case NoneType(None)?
>
> Why would that be a special case? If NoneType takes no arguments, and you
> supply an argument, then it is an error regardless of what that argument
> happens to be.

I agree. I asked because there were objections to correcting object(x) 
to raise instead of ignore.

Terry Jan Reedy





From tjreedy at udel.edu  Fri Mar  5 16:27:56 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 05 Mar 2010 16:27:56 -0500
Subject: isinstance(False, int)
In-Reply-To: <4B914DAE.60209@mrabarnett.plus.com>
References: <hmre56$tvp$2@dough.gmane.org> <4B914DAE.60209@mrabarnett.plus.com>
Message-ID: <hmrt0q$nes$2@dough.gmane.org>

On 3/5/2010 1:30 PM, MRAB wrote:
> mk wrote:
>> >>> isinstance(False, int)
>> True
>> >>>
>> >>> isinstance(True, int)
>> True
>>
>> Huh?
>>
>> >>>
>> >>> issubclass(bool, int)
>> True
>>
>> Huh?!
>>
> Python didn't have Booleans originally, 0 and 1 were used instead. When
> bool was introduced it was made a subclass of int so that existing code
> wouldn't break.

And because it is useful to make it so.

Terry Jan Reedy




From pemerson at gmail.com  Fri Mar  5 16:29:48 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 13:29:48 -0800 (PST)
Subject: Conditional based on whether or not a module is being used
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
	<50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com> 
	<14a5cd5e1003051225j1d596aa2nfe9eb1047037f19d@mail.gmail.com> 
	<mailman.383.1267823696.23598.python-list@python.org>
Message-ID: <f4de1c96-502a-42e7-b647-ce52d0f76f2f@u15g2000prd.googlegroups.com>

On Mar 5, 1:14?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Fri, Mar 5, 2010 at 12:25 PM, Pete Emerson <pemer... at gmail.com> wrote:
> > On Fri, Mar 5, 2010 at 12:17 PM, Chris Rebert <c... at rebertia.com> wrote:
> >> On 3/5/10, Pete Emerson <pemer... at gmail.com> wrote:
> >>> In a module, how do I create a conditional that will do something
> >>> based on whether or not another module has been loaded?
> <snip>
> >>> If someone is using foo module, I want to take advantage of its
> >>> features and use it in foobar, otherwise, I want to do something else.
> >>> In other words, I don't want to create a dependency of foobar on foo.
>
> >>> My failed search for solving this makes me wonder if I'm approaching
> >>> this all wrong.
>
> >> Just try importing foo, and then catch the exception if it's not installed.
> <snip>
> > Except I want to use the module only if the main program is using it
> > too, not just if it's available for use. I think that I found a way in
> > my follow-up post to my own message, but not sure it's the best way or
> > conventional.
>
> What is your use case for this behavior exactly? You've piqued my curiosity.
>
> Cheers,
> Chris
> --http://blog.rebertia.com

I have written my first module called "logger" that logs to syslog via
the syslog module but also allows for logging to STDOUT in debug mode
at multiple levels (to increase verbosity depending on one's need), or
both. I've looked at the logging module and while it might suit my
needs, it's overkill for me right now (I'm still *very* much a python
newbie).

I want to write other modules, and my thinking is that it makes sense
for those modules to use the "logger" module to do the logging, if and
only if the parent using the other modules is also using the logger
module.

In other words, I don't want to force someone to use the "logger"
module just so they can use my other modules, even if the "logger"
module is installed ... but I also want to take advantage of it if I'm
using it.

Now that I've written that, I'm not sure that makes a whole lot of
sense. It seems like I could say, "hey, this person has the 'logger'
module available, let's use it!".

Thoughts?


From p.c.j.kleiweg at rug.nl  Fri Mar  5 16:34:00 2010
From: p.c.j.kleiweg at rug.nl (Peter Kleiweg)
Date: Fri, 5 Mar 2010 22:34:00 +0100
Subject: How to send utf-8 mail in Python 3?
Message-ID: <alpine.DEB.1.10.1003052229230.3703@localhost>


I try to send e-mail from Python 3.1.1

Encoding as iso-8859-1 goes fine.
But encoding as utf-8 doesn't work.
What am I doing wrong?


Python 3.1.1 (r311:74480, Oct  2 2009, 11:50:52) 
[GCC 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from email.mime.text import MIMEText
>>> text = 'H\u00e9'
>>> msg = MIMEText(text, 'plain', 'iso-8859-1')
>>> print(msg.as_string())
Content-Type: text/plain; charset="iso-8859-1"
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable

H=E9
>>> msg = MIMEText(text, 'plain', 'utf-8')
Traceback (most recent call last):
  File "/my/opt/Python-3/lib/python3.1/email/message.py", line 269, in set_charset
    cte(self)
TypeError: 'str' object is not callable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/my/opt/Python-3/lib/python3.1/email/mime/text.py", line 30, in __init__
    self.set_payload(_text, _charset)
  File "/my/opt/Python-3/lib/python3.1/email/message.py", line 234, in set_payload
    self.set_charset(charset)
  File "/my/opt/Python-3/lib/python3.1/email/message.py", line 271, in set_charset
    self._payload = charset.body_encode(self._payload)
  File "/my/opt/Python-3/lib/python3.1/email/charset.py", line 380, in body_encode
    return email.base64mime.body_encode(string)
  File "/my/opt/Python-3/lib/python3.1/email/base64mime.py", line 94, in body_encode
    enc = b2a_base64(s[i:i + max_unencoded]).decode("ascii")
TypeError: must be bytes or buffer, not str
>>> 




-- 
Peter Kleiweg


From gherron at islandtraining.com  Fri Mar  5 16:42:01 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Fri, 05 Mar 2010 13:42:01 -0800
Subject: Slicing [N::-1]
In-Reply-To: <f2b985f4-f83d-4df4-a7ab-135fc18296c7@q23g2000yqd.googlegroups.com>
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>	<m2wrxqzlhm.fsf@googlemail.com>	<4b914d35$0$27863$c3e8da3@news.astraweb.com>
	<f2b985f4-f83d-4df4-a7ab-135fc18296c7@q23g2000yqd.googlegroups.com>
Message-ID: <4B917AA9.7070207@islandtraining.com>

Mensanator wrote:
> On Mar 5, 12:28 pm, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
>   
>> On Fri, 05 Mar 2010 18:12:05 +0000, Arnaud Delobelle wrote:
>>     
>>>>>> l = range(10)
>>>>>> l
>>>>>>             
>>> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>>       
>>>>>> l[7::-1]
>>>>>>             
>>> [7, 6, 5, 4, 3, 2, 1, 0]
>>>       
>>>>>> [l[i] for i in range(7, -1, -1)]
>>>>>>             
>>> [7, 6, 5, 4, 3, 2, 1, 0]
>>>       
>> Where does the first -1 come from? Slices are supposed to have default
>> values of 0 and len(seq):
>>     
>
> The only way to get a 0 from a reverse range() is to have a bound of
> -1.
>   

Not quite.  An empty second bound goes all the way to the zero index:

 >>> range(9)[2::-1]
[2, 1, 0]

Gary Herron




>   
>>>>> l[7::1]
>>>>>           
>> [7, 8, 9]
>>     
>>>>> [l[i] for i in range(7, len(l), 1)]
>>>>>           
>> [7, 8, 9]
>>     
>>>>> [l[i] for i in range(7, len(l), -1)]
>>>>>           
>> []
>>
>> I don't believe the actual behaviour is documented anywhere.
>>     
>
> Well, it's implied. If the stopping bound in a reverse range()
> is greater than the starting bound, you get an empty return.
>
>   
>> --
>> Steven
>>     
>
>   



From nyamatongwe+thunder at gmail.com  Fri Mar  5 16:45:54 2010
From: nyamatongwe+thunder at gmail.com (Neil Hodgson)
Date: Fri, 05 Mar 2010 21:45:54 GMT
Subject: Passing FILE * types using ctypes
In-Reply-To: <a83319d7-c199-4532-9816-d002f7fd7914@q16g2000yqq.googlegroups.com>
References: <a83319d7-c199-4532-9816-d002f7fd7914@q16g2000yqq.googlegroups.com>
Message-ID: <mYekn.11411$pv.3037@news-server.bigpond.net.au>

Zeeshan Quireshi:

> Hello, I'm using ctypes to wrap a library i wrote. I am trying to pass
> it a FILE *pointer, how do i open a file in Python and convert it to a
> FILE *pointer.

   For this to work, your library should have been compiled with the
same compiler as Python and possibly the same compiler options such as
choice of runtime library. Otherwise, they may differ in the content and
layout of FILE and also in behaviour. On Unix, this may not be a problem
because of the shared runtime but on Windows it can cause crashes.

   Neil


From tjreedy at udel.edu  Fri Mar  5 16:46:23 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 05 Mar 2010 16:46:23 -0500
Subject: Slicing [N::-1]
In-Reply-To: <hmrkus$pn9$1@dough.gmane.org>
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>	<m2wrxqzlhm.fsf@googlemail.com>	<4b914d35$0$27863$c3e8da3@news.astraweb.com>
	<hmrkus$pn9$1@dough.gmane.org>
Message-ID: <hmru3e$rie$1@dough.gmane.org>

On 3/5/2010 2:10 PM, Robert Kern wrote:

> Rather, they have 0 and len(seq), respectively, when the step is
> positive, and len(seq)-1 and -1 when the step is negative.

>> I don't believe the actual behaviour is documented anywhere.
>
> True, I don't think it is.

There are at least two open issues.

http://bugs.python.org/issue1446619
http://bugs.python.org/issue7460





From tjreedy at udel.edu  Fri Mar  5 16:51:25 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 05 Mar 2010 16:51:25 -0500
Subject: isinstance(False, int)
In-Reply-To: <4B915352.8010709@sequans.com>
References: <mailman.357.1267809307.23598.python-list@python.org>	<4b914860$0$27863$c3e8da3@news.astraweb.com>
	<4B915352.8010709@sequans.com>
Message-ID: <hmrucs$sjl$1@dough.gmane.org>

On 3/5/2010 1:54 PM, Jean-Michel Pichavant wrote:
> Steven D'Aprano wrote:

> Despite there are good reasons for bool to be int, the newcomer 'wtf'
> reaction at first glance is legitimate.
> Starting python from scratch, booleans would have not been a subclass of
> int (just guessing though), 'cause it makes no sense from a design POV.

You are just guessing. I would argue for what we have. An example of its 
usefulness:

 >>> scores =[True, False, True, True, False]
 >>> score = sum(scores)
 >>> score
3

Bools are also usefully used as sequence indexes.

Terry Jan Reedy





From arnodel at googlemail.com  Fri Mar  5 17:00:16 2010
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Fri, 05 Mar 2010 22:00:16 +0000
Subject: imap vs map
References: <mailman.375.1267818928.23598.python-list@python.org>
Message-ID: <m2sk8ezaxb.fsf@googlemail.com>

mk <mrkafk at gmail.com> writes:

> Hello everyone,
>
> I re-wrote more "slowly" an example at the end of
> http://wordaligned.org/articles/essential-python-reading-list
>
>
> This example finds anagrams in the text file.
>
> ====
> from itertools import groupby, imap
> from operator import itemgetter
>
> from string import ascii_lowercase, ascii_uppercase, punctuation,
> maketrans, translate
>
> data = open(r"c:\temp\words.txt", "rt").read()
>
> trtable = maketrans(ascii_uppercase, ascii_lowercase)
>
> words = translate(data, trtable, deletions = punctuation)
>
> words = list(set(words.split()))
>
> sw = sorted(words, key=sorted)
>
> gb = groupby(sw, sorted)
>
> print map(list, imap(itemgetter(1), gb))
> ===
>
> words.txt:
> ===
> Word Aligned
> three
> space sensitive programming
> Feed Logo tins
> Essential Python post  Reading List
> stop course there
> times isnt
> capes
> ===
>
> Now, when I execute above, it works:
>
> [['capes', 'space'], ['aligned'], ['reading'], ['essential'],
> ['programming'], ['course'], ['feed'], ['word'], ['there', 'three'],
> ['sensitive'], ['times'], ['logo'], ['python'], ['list'], ['isnt',
> tins'], ['stop', 'post']]
>
>
> However, when I change the last line to:
>
> print map(list, map(itemgetter(1), gb))
>
> It stops working:
>
> [[], [], [], [], [], [], [], [], [], [], [], [], [], [], [], ['post']]
>
> Why? I was under impression that the only difference between map and
> imap is that imap returns iterator allowing to produce a list, while
> map returns equivalent list?
>
> Regards,
> mk

>From the itertools docs [1]:

     The returned group is itself an iterator that shares the underlying
     iterable with groupby(). Because the source is shared, when the
     groupby() object is advanced, the previous group is no longer
     visible. So, if that data is needed later, it should be stored as a
     list:

     (example follows)

So when you use:

     print map(list, imap(itemgetter(1), gb))

each group is stored as a list *before* the groupby() object is
advanced, so that's ok.

However, when you use:

    print map(list, map(itemgetter(1), gb))

the groupby() object is advanced to the end *before* each group is
stored as a list.  According the the docs quoted above, this renders
each group no longer visible.

It is for the same reason that the following are different:

>>> def foo():
...     for i in range(5):
...         yield lambda: i
... 
>>> map(lambda f: f(), imap(lambda x: x, foo()))
[0, 1, 2, 3, 4]
>>> map(lambda f: f(), map(lambda x: x, foo()))
[4, 4, 4, 4, 4]

Although looking back at it, I don't know if this will help you :)

[1] http://docs.python.org/library/itertools.html#itertools.groupby

-- 
Arnaud


From robert.kern at gmail.com  Fri Mar  5 17:09:17 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 05 Mar 2010 16:09:17 -0600
Subject: isinstance(False, int)
In-Reply-To: <b8e622741003051258n29394b93q5382421fc496a82f@mail.gmail.com>
References: <mailman.357.1267809307.23598.python-list@python.org>	<m2aaum1w8q.fsf@googlemail.com>
	<hmrinv$ftq$1@dough.gmane.org>	<mailman.370.1267815705.23598.python-list@python.org>	<4b91616d$0$27863$c3e8da3@news.astraweb.com>
	<b8e622741003051258n29394b93q5382421fc496a82f@mail.gmail.com>
Message-ID: <hmrved$li$1@dough.gmane.org>

On 2010-03-05 14:58 PM, Jack Diederich wrote:
> On Fri, Mar 5, 2010 at 2:54 PM, Steven D'Aprano
> <steve at remove-this-cybersource.com.au>  wrote:
>> On Fri, 05 Mar 2010 15:01:23 -0400, Rolando Espinoza La Fuente wrote:
>>
>>> On Fri, Mar 5, 2010 at 2:32 PM, mk<mrkafk at gmail.com>  wrote:
>>>> Arnaud Delobelle wrote:
>>>>
>>>>>>>> 1 == True
>>>>>
>>>>> True
>>>>>>>>
>>>>>>>> 0 == False
>>>>>
>>>>> True
>>>>>
>>>>> So what's your question?
>>>>
>>>> Well nothing I'm just kind of bewildered: I'd expect smth like that in
>>>> Perl, but not in Python.. Although I can understand the rationale after
>>>> skimming PEP 285, I still don't like it very much.
>>>>
>>>>
>>> So, the pythonic way to check for True/False should be:
>>>
>>>>>> 1 is True
>>> False
>>
>> Why do you need to check for True/False?
>>
>
> You should never check for "is" False/True but always check for
> equality.  The reason is that many types support the equality (__eq__)
> and boolen (__bool__ in 3x) protocols.  If you check equality these
> will be invoked, if you check identity ("is") they won't.

It depends on what you're doing. mk seems to want to distinguish booleans from 
other objects from some reason.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From robert.kern at gmail.com  Fri Mar  5 17:12:39 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 05 Mar 2010 16:12:39 -0600
Subject: Slicing [N::-1]
In-Reply-To: <hmrkus$pn9$1@dough.gmane.org>
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>	<m2wrxqzlhm.fsf@googlemail.com>	<4b914d35$0$27863$c3e8da3@news.astraweb.com>
	<hmrkus$pn9$1@dough.gmane.org>
Message-ID: <hmrvko$1mu$1@dough.gmane.org>

On 2010-03-05 13:10 PM, Robert Kern wrote:
> On 2010-03-05 12:28 PM, Steven D'Aprano wrote:
>> On Fri, 05 Mar 2010 18:12:05 +0000, Arnaud Delobelle wrote:
>>
>>>>>> l = range(10)
>>>>>> l
>>> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>>>>> l[7::-1]
>>> [7, 6, 5, 4, 3, 2, 1, 0]
>>>>>> [l[i] for i in range(7, -1, -1)]
>>> [7, 6, 5, 4, 3, 2, 1, 0]
>>
>> Where does the first -1 come from? Slices are supposed to have default
>> values of 0 and len(seq):
>
> Rather, they have 0 and len(seq), respectively, when the step is
> positive, and len(seq)-1 and -1 when the step is negative.

Well, not entirely true. [N:-1:-1] obviously doesn't work for this. Rather, 
leaving the second argument in the slice empty means "go to the end if step > 0 
or go to the beginning if step < 0". There is no explicit translation of the 
latter because there is no numerical index for the element before the first element.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From tjreedy at udel.edu  Fri Mar  5 17:16:00 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 05 Mar 2010 17:16:00 -0500
Subject: Conditional based on whether or not a module is being used
In-Reply-To: <f4de1c96-502a-42e7-b647-ce52d0f76f2f@u15g2000prd.googlegroups.com>
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>	<50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com>
	<14a5cd5e1003051225j1d596aa2nfe9eb1047037f19d@mail.gmail.com>
	<mailman.383.1267823696.23598.python-list@python.org>
	<f4de1c96-502a-42e7-b647-ce52d0f76f2f@u15g2000prd.googlegroups.com>
Message-ID: <hmrvqu$1d0$1@dough.gmane.org>

On 3/5/2010 4:29 PM, Pete Emerson wrote:
> On Mar 5, 1:14 pm, Chris Rebert<c... at rebertia.com>  wrote:

> I want to write other modules, and my thinking is that it makes sense
> for those modules to use the "logger" module to do the logging, if and
> only if the parent using the other modules is also using the logger
> module.
>
> In other words, I don't want to force someone to use the "logger"
> module just so they can use my other modules, even if the "logger"
> module is installed ... but I also want to take advantage of it if I'm
> using it.
>
> Now that I've written that, I'm not sure that makes a whole lot of
> sense. It seems like I could say, "hey, this person has the 'logger'
> module available, let's use it!".

Except in unusual cases, where merely importing a modules uses 
substantial resources, I would say that if it is available, use it.



From aahz at pythoncraft.com  Fri Mar  5 17:45:34 2010
From: aahz at pythoncraft.com (Aahz)
Date: 5 Mar 2010 14:45:34 -0800
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com> <9c33fd40-7fe8-4274
	<7xwrxv4vv7.fsf@ruckus.brouhaha.com>
Message-ID: <hms1ie$ivs$1@panix5.panix.com>

In article <7xwrxv4vv7.fsf at ruckus.brouhaha.com>,
Paul Rubin  <no.email at nospam.invalid> wrote:
>
>ReST is another abomination that should never have gotten off the
>ground.  It is one of the reasons I react so negatively to your
>config format proposal.  It just sounds like more of the same.

Really?  What should we use instead of reST?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From steve at REMOVE-THIS-cybersource.com.au  Fri Mar  5 18:07:52 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 23:07:52 GMT
Subject: Generic singleton
References: <mailman.222.1267642515.23598.python-list@python.org>
	<pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>
	<Xns9D317DB33C63Aduncanbooth@127.0.0.1>
	<4b907b5e$0$27863$c3e8da3@news.astraweb.com>
	<mailman.354.1267808250.23598.python-list@python.org>
	<4b9146e6$0$27863$c3e8da3@news.astraweb.com>
	<mailman.384.1267824375.23598.python-list@python.org>
Message-ID: <4b918ec8$0$27863$c3e8da3@news.astraweb.com>

On Fri, 05 Mar 2010 16:25:46 -0500, Terry Reedy wrote:

> On 3/5/2010 1:01 PM, Steven D'Aprano wrote:
>> On Fri, 05 Mar 2010 11:57:13 -0500, Terry Reedy wrote:
>>
>>> On 3/4/2010 10:32 PM, Steven D'Aprano wrote:
>>>
>>>> Python does have it's own singletons, like None, True and False.
>>>
>>> True and False are not singletons.
>>
>> Duotons? Doubletons?
> 
> The latter is what I use.

The Wikipedia article on Singleton states that it is acceptable to 
generalise "Singleton" to allow multiple instances.

http://en.wikipedia.org/wiki/Singleton_pattern

While Doubleton or even Tripleton sound cute, once you get to large 
counts it all starts getting ugly and horrible. "Polyton"? Blah.


[...]
> This is your strongest argument. It has nothing to do in particular with
> (the dubious analogy with) bool. Here is a draft of what you might post
> to python-ideas list, or even the tracker.

Oh, you have misunderstood me. I'm not particularly concerned about 
NoneType's behaviour, and certainly not concerned enough to champion the 
change against any opposition (let alone through the moratorium!). I 
wanted to understand why the difference existed.

Python has at least two other singletons, Ellipsis and NotImplemented, 
and both behave like None.



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Fri Mar  5 18:09:58 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 05 Mar 2010 23:09:58 GMT
Subject: isinstance(False, int)
References: <mailman.357.1267809307.23598.python-list@python.org>
	<m2aaum1w8q.fsf@googlemail.com> <hmrinv$ftq$1@dough.gmane.org>
	<mailman.370.1267815705.23598.python-list@python.org>
	<4b91616d$0$27863$c3e8da3@news.astraweb.com>
	<mailman.381.1267822684.23598.python-list@python.org>
Message-ID: <4b918f46$0$27863$c3e8da3@news.astraweb.com>

On Fri, 05 Mar 2010 15:58:01 -0500, Jack Diederich wrote:

>>> So, the pythonic way to check for True/False should be:
>>>
>>>>>> 1 is True
>>> False
>>
>> Why do you need to check for True/False?
>>
>>
> You should never check for "is" False/True but always check for
> equality.  The reason is that many types support the equality (__eq__)
> and boolen (__bool__ in 3x) protocols.  If you check equality these will
> be invoked, if you check identity ("is") they won't.

Never say never.

If you specifically want to test for True or False themselves, accepting 
no substitutes, then using "is" is the obvious way, and using "==" is 
clearly and obviously wrong because it does accept substitutes:

>>> 1.0 == True
True
>>> decimal.Decimal(0, 1) == False
True



-- 
Steven


From jackdied at gmail.com  Fri Mar  5 18:48:39 2010
From: jackdied at gmail.com (Jack Diederich)
Date: Fri, 5 Mar 2010 18:48:39 -0500
Subject: isinstance(False, int)
In-Reply-To: <4b918f46$0$27863$c3e8da3@news.astraweb.com>
References: <mailman.357.1267809307.23598.python-list@python.org>
	<m2aaum1w8q.fsf@googlemail.com> <hmrinv$ftq$1@dough.gmane.org>
	<mailman.370.1267815705.23598.python-list@python.org>
	<4b91616d$0$27863$c3e8da3@news.astraweb.com>
	<mailman.381.1267822684.23598.python-list@python.org>
	<4b918f46$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <b8e622741003051548v4adbfe97o7224143df91a6f42@mail.gmail.com>

On Fri, Mar 5, 2010 at 6:09 PM, Steven D'Aprano
<steve at remove-this-cybersource.com.au> wrote:
> On Fri, 05 Mar 2010 15:58:01 -0500, Jack Diederich wrote:
>
>>>> So, the pythonic way to check for True/False should be:
>>>>
>>>>>>> 1 is True
>>>> False
>>>
>>> Why do you need to check for True/False?
>>>
>>>
>> You should never check for "is" False/True but always check for
>> equality. ?The reason is that many types support the equality (__eq__)
>> and boolen (__bool__ in 3x) protocols. ?If you check equality these will
>> be invoked, if you check identity ("is") they won't.
>
> Never say never.
>
> If you specifically want to test for True or False themselves, accepting
> no substitutes, then using "is" is the obvious way, and using "==" is
> clearly and obviously wrong because it does accept substitutes:
>
>>>> 1.0 == True
> True
>>>> decimal.Decimal(0, 1) == False
> True


Yes, obviously if you _really_ mean to test if something has the
object identity of True or False then an "is" test is the way to go.
I'm just not sure why you would ever do that.  Also, I'm not sure how
your assertion matches up with the examples; The examples test for
equality with a float that returns true for __eq__ and a Decimal that
returns false for __eq__.  Both "1.0" and "Decimal(0, 1)" will return
False if the test is "is True" or "is False."

-Jack


From clp2 at rebertia.com  Fri Mar  5 18:59:39 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 5 Mar 2010 15:59:39 -0800
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <hms1ie$ivs$1@panix5.panix.com>
References: <mailman.34.1267409372.23598.python-list@python.org>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<7xwrxv4vv7.fsf@ruckus.brouhaha.com> <hms1ie$ivs$1@panix5.panix.com>
Message-ID: <50697b2c1003051559k1fdca9e8xd7c394f1c177eedb@mail.gmail.com>

On Fri, Mar 5, 2010 at 2:45 PM, Aahz <aahz at pythoncraft.com> wrote:
> In article <7xwrxv4vv7.fsf at ruckus.brouhaha.com>,
> Paul Rubin  <no.email at nospam.invalid> wrote:
>>
>>ReST is another abomination that should never have gotten off the
>>ground.  It is one of the reasons I react so negatively to your
>>config format proposal.  It just sounds like more of the same.
>
> Really?  What should we use instead of reST?

Markdown, Textile, or possibly Creole; reST has so little use outside of
Python as to be nearly Python-specific.
It'd be nice not to have to learn yet another markup language without good
reason.

Cheers,
Chris
--
http://blog.rebertia.com
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From mensanator at aol.com  Fri Mar  5 19:09:06 2010
From: mensanator at aol.com (Mensanator)
Date: Fri, 5 Mar 2010 16:09:06 -0800 (PST)
Subject: Slicing [N::-1]
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>
	<m2wrxqzlhm.fsf@googlemail.com>
	<4b914d35$0$27863$c3e8da3@news.astraweb.com> 
	<f2b985f4-f83d-4df4-a7ab-135fc18296c7@q23g2000yqd.googlegroups.com> 
	<mailman.386.1267825329.23598.python-list@python.org>
Message-ID: <ca702be2-3307-41a9-85b9-d1cf6a49a049@q16g2000yqq.googlegroups.com>

On Mar 5, 3:42?pm, Gary Herron <gher... at islandtraining.com> wrote:
> Mensanator wrote:
>
> > The only way to get a 0 from a reverse range() is to have a bound of
> > -1.
>
> Not quite. ?An empty second bound goes all the way to the zero index:

Not the same thing. You're using the bounds of the slice index.
I was refering to the bounds of the range() function.

>>> for a in range(9,-9,-1):print(a,end=' ')
9 8 7 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 -7 -8

To get that to stop at 0, you use a -1 as the bounds:

>>> for a in range(9,-1,-1):print(a,end=' ')
9 8 7 6 5 4 3 2 1 0

Your slice notation only works if the last (first?) number in
the range happens to be 0. What if the range bounds were variables?
You may still want to force the range's last number to be 0 by
using a constant like range(a,-1,-1) rather than just take
the last number of range(a,b,-1) by using slice notation.

>
> ?>>> range(9)[2::-1]
> [2, 1, 0]
>
> Gary Herron


From clp2 at rebertia.com  Fri Mar  5 19:18:29 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 5 Mar 2010 16:18:29 -0800
Subject: isinstance(False, int)
In-Reply-To: <hmrucs$sjl$1@dough.gmane.org>
References: <mailman.357.1267809307.23598.python-list@python.org>
	<4b914860$0$27863$c3e8da3@news.astraweb.com>
	<4B915352.8010709@sequans.com> <hmrucs$sjl$1@dough.gmane.org>
Message-ID: <50697b2c1003051618n7b37aee6t74bd8f9edc5d21f5@mail.gmail.com>

On Fri, Mar 5, 2010 at 1:51 PM, Terry Reedy <tjreedy at udel.edu> wrote:
> On 3/5/2010 1:54 PM, Jean-Michel Pichavant wrote:
>> Steven D'Aprano wrote:
>
>> Despite there are good reasons for bool to be int, the newcomer 'wtf'
>> reaction at first glance is legitimate.
>> Starting python from scratch, booleans would have not been a subclass of
>> int (just guessing though), 'cause it makes no sense from a design POV.
>
> You are just guessing. I would argue for what we have. An example of its
> usefulness:
>
>>>> scores =[True, False, True, True, False]
>>>> score = sum(scores)
>>>> score
> 3
>
> Bools are also usefully used as sequence indexes.

Arguably, these sorts of uses only require bool to be /convertible/ to
int, not to necessarily be a /subclass/ of int.

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


From gherron at islandtraining.com  Fri Mar  5 19:34:26 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Fri, 05 Mar 2010 16:34:26 -0800
Subject: Slicing [N::-1]
In-Reply-To: <ca702be2-3307-41a9-85b9-d1cf6a49a049@q16g2000yqq.googlegroups.com>
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>	<m2wrxqzlhm.fsf@googlemail.com>	<4b914d35$0$27863$c3e8da3@news.astraweb.com>
	<f2b985f4-f83d-4df4-a7ab-135fc18296c7@q23g2000yqd.googlegroups.com>
	<mailman.386.1267825329.23598.python-list@python.org>
	<ca702be2-3307-41a9-85b9-d1cf6a49a049@q16g2000yqq.googlegroups.com>
Message-ID: <4B91A312.9060608@islandtraining.com>

Mensanator wrote:
> On Mar 5, 3:42 pm, Gary Herron <gher... at islandtraining.com> wrote:
>   
>> Mensanator wrote:
>>
>>     
>>> The only way to get a 0 from a reverse range() is to have a bound of
>>> -1.
>>>       
>> Not quite.  An empty second bound goes all the way to the zero index:
>>     
>
> Not the same thing. You're using the bounds of the slice index.
> I was refering to the bounds of the range() function.
>
>   
>>>> for a in range(9,-9,-1):print(a,end=' ')
>>>>         
> 9 8 7 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 -7 -8
>
> To get that to stop at 0, you use a -1 as the bounds:
>
>   
>>>> for a in range(9,-1,-1):print(a,end=' ')
>>>>         
> 9 8 7 6 5 4 3 2 1 0
>
> Your slice notation only works if the last (first?) number in
> the range happens to be 0. What if the range bounds were variables?
> You may still want to force the range's last number to be 0 by
> using a constant like range(a,-1,-1) rather than just take
> the last number of range(a,b,-1) by using slice notation.
>   

All true  and valid of course, but I was just contridicting the "the 
ONLY way to get a 0" (emphasis mine) part of the statement.

Gary Herron



>   
>>  >>> range(9)[2::-1]
>> [2, 1, 0]
>>
>> Gary Herron
>>     



From greg.ewing at canterbury.ac.nz  Fri Mar  5 20:06:37 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sat, 06 Mar 2010 14:06:37 +1300
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <4b90bb3c$0$27863$c3e8da3@news.astraweb.com>
References: <mailman.34.1267409372.23598.python-list@python.org>	<pan.2010.03.01.03.18.47@REMOVE.THIS.cybersource.com.au>	<bd1a80ea-f412-49c6-8af4-c008765da683@y11g2000yqh.googlegroups.com>	<mailman.64.1267463648.23598.python-list@python.org>	<66d0a0af-1ae7-4849-8e2a-fe80d4d49023@d2g2000yqa.googlegroups.com>	<7xljebyl56.fsf@ruckus.brouhaha.com>	<mailman.70.1267468806.23598.python-list@python.org>	<3aa65bd6-6b6f-42f0-aeec-1e70e5047da0@o3g2000yqb.googlegroups.com>	<7xhbozrfy4.fsf@ruckus.brouhaha.com>	<9c33fd40-7fe8-4274-84e4-9a9b5585d69f@19g2000yqu.googlegroups.com>	<7x635fdcth.fsf@ruckus.brouhaha.com>	<mailman.199.1267631220.23598.python-list@python.org>	<7xlje8lb9o.fsf@ruckus.brouhaha.com>
	<7vbiuqF4utU1@mid.individual.net>
	<4b90bb3c$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <7vdnhhFo9jU1@mid.individual.net>

Steven D'Aprano wrote:

> I use footnotes all the time[1] in plain text documents and emails. I 
> don't think there's anything bizarre about it at all.

It's not the use of footnotes I'm talking about, it's
the cryptic character sequences used to mark them up
in ReST. Nobody would come up with them on their own
without having read the fine print of an ReST manual.

-- 
Greg


From robert.kern at gmail.com  Fri Mar  5 20:08:01 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 05 Mar 2010 19:08:01 -0600
Subject: isinstance(False, int)
In-Reply-To: <b8e622741003051548v4adbfe97o7224143df91a6f42@mail.gmail.com>
References: <mailman.357.1267809307.23598.python-list@python.org>	<m2aaum1w8q.fsf@googlemail.com>
	<hmrinv$ftq$1@dough.gmane.org>	<mailman.370.1267815705.23598.python-list@python.org>	<4b91616d$0$27863$c3e8da3@news.astraweb.com>	<mailman.381.1267822684.23598.python-list@python.org>	<4b918f46$0$27863$c3e8da3@news.astraweb.com>
	<b8e622741003051548v4adbfe97o7224143df91a6f42@mail.gmail.com>
Message-ID: <hms9th$vs3$1@dough.gmane.org>

On 2010-03-05 17:48 PM, Jack Diederich wrote:
> On Fri, Mar 5, 2010 at 6:09 PM, Steven D'Aprano
> <steve at remove-this-cybersource.com.au>  wrote:
>> On Fri, 05 Mar 2010 15:58:01 -0500, Jack Diederich wrote:
>>
>>>>> So, the pythonic way to check for True/False should be:
>>>>>
>>>>>>>> 1 is True
>>>>> False
>>>>
>>>> Why do you need to check for True/False?
>>>>
>>>>
>>> You should never check for "is" False/True but always check for
>>> equality.  The reason is that many types support the equality (__eq__)
>>> and boolen (__bool__ in 3x) protocols.  If you check equality these will
>>> be invoked, if you check identity ("is") they won't.
>>
>> Never say never.
>>
>> If you specifically want to test for True or False themselves, accepting
>> no substitutes, then using "is" is the obvious way, and using "==" is
>> clearly and obviously wrong because it does accept substitutes:
>>
>>>>> 1.0 == True
>> True
>>>>> decimal.Decimal(0, 1) == False
>> True
>
>
> Yes, obviously if you _really_ mean to test if something has the
> object identity of True or False then an "is" test is the way to go.
> I'm just not sure why you would ever do that.  Also, I'm not sure how
> your assertion matches up with the examples; The examples test for
> equality with a float that returns true for __eq__ and a Decimal that
> returns false for __eq__.

No, both comparisons return True. Decimal(0,1) is equal in value to 0 (and thus 
False). Comparing it to False using __eq__ returns True.

> Both "1.0" and "Decimal(0, 1)" will return
> False if the test is "is True" or "is False."

Yes. That is exactly what he is asserting.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From no.email at nospam.invalid  Fri Mar  5 20:10:14 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Fri, 05 Mar 2010 17:10:14 -0800
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<7xhbozrfy4.fsf@ruckus.brouhaha.com>
	<7xwrxv4vv7.fsf@ruckus.brouhaha.com> <hms1ie$ivs$1@panix5.panix.com>
	<50697b2c1003051559k1fdca9e8xd7c394f1c177eedb@mail.gmail.com>
	<mailman.397.1267838161.23598.python-list@python.org>
Message-ID: <7xocj2fe6h.fsf@ruckus.brouhaha.com>

Robert Kern <robert.kern at gmail.com> writes:
>> Markdown, Textile, or possibly Creole;...
> I believe ReST predates all of those mentioned.

Texinfo and POD are certainly older than ReST.  I'm not sure about
MediaWiki markup, but it's gotten so much traction that Markdown
should probably be abandoned in its favor even if Markdown is older.


From robert.kern at gmail.com  Fri Mar  5 20:15:46 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 05 Mar 2010 19:15:46 -0600
Subject: Draft PEP on RSON configuration file format
In-Reply-To: <50697b2c1003051559k1fdca9e8xd7c394f1c177eedb@mail.gmail.com>
References: <mailman.34.1267409372.23598.python-list@python.org>	<7xhbozrfy4.fsf@ruckus.brouhaha.com>	<7xwrxv4vv7.fsf@ruckus.brouhaha.com>
	<hms1ie$ivs$1@panix5.panix.com>
	<50697b2c1003051559k1fdca9e8xd7c394f1c177eedb@mail.gmail.com>
Message-ID: <hmsac3$1bv$1@dough.gmane.org>

On 2010-03-05 17:59 PM, Chris Rebert wrote:
> On Fri, Mar 5, 2010 at 2:45 PM, Aahz <aahz at pythoncraft.com
> <mailto:aahz at pythoncraft.com>> wrote:
>  > In article <7xwrxv4vv7.fsf at ruckus.brouhaha.com
> <mailto:7xwrxv4vv7.fsf at ruckus.brouhaha.com>>,
>  > Paul Rubin <no.email at nospam.invalid> wrote:
>  >>
>  >>ReST is another abomination that should never have gotten off the
>  >>ground.  It is one of the reasons I react so negatively to your
>  >>config format proposal.  It just sounds like more of the same.
>  >
>  > Really?  What should we use instead of reST?
>
> Markdown, Textile, or possibly Creole; reST has so little use outside of
> Python as to be nearly Python-specific.
> It'd be nice not to have to learn yet another markup language without
> good reason.

I believe ReST predates all of those mentioned.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From greg.ewing at canterbury.ac.nz  Fri Mar  5 20:19:03 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sat, 06 Mar 2010 14:19:03 +1300
Subject: My four-yorkshireprogrammers contribution
In-Reply-To: <mailman.294.1267719244.23598.python-list@python.org>
References: <20100224212303.242222c6@geekmail.INVALID>	<eq4l57-okf2.ln1@ozzie.tundraware.com>	<20100226173907.5567609f@geekmail.INVALID>	<mailman.285.1267208717.4577.python-list@python.org>	<hm9cbc$9p4$1@speranza.aioe.org>	<7uu1ooFiipU1@mid.individual.net>	<4B89D8BE.2040905@mrabarnett.plus.com>	<4B8B9845.70604@sequans.com>	<mailman.59.1267456634.23598.python-list@python.org>	<7v695nFa0fU1@mid.individual.net>	<mailman.189.1267627321.23598.python-list@python.org>	<7v9e3rFl7mU1@mid.individual.net>
	<mailman.294.1267719244.23598.python-list@python.org>
Message-ID: <7vdo8sFrelU1@mid.individual.net>

MRAB wrote:

> By the standards of just a few years later, that's not so much a
> microcomputer as a nanocomputer!

Although not quite as nano as another design published
in EA a couple of years earlier, the EDUC-8:

   http://www.sworld.com.au/steven/educ-8/

It had a *maximum* of 256 bytes -- due to the architecture,
there was no way of addressing any more. Also it was
divided into 16-byte pages, with indirect addressing
required to access anything in a different page from
the instruction. Programming for it must have been
rather challenging.

As far as I know, the EDUC-8 is unique in being the
only computer design ever published in a hobby magazine
that *wasn't* based on a microprocessor -- it was all
built out of 9000 and 7400 series TTL logic chips!

-- 
Greg


From pemerson at gmail.com  Fri Mar  5 20:22:14 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 17:22:14 -0800 (PST)
Subject: best practices: is collections.defaultdict my friend or not?
Message-ID: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>

I've been wrestling with dicts. I hope at the very least what I
discovered helps someone else out, but I'm interested in hearing from
more learned python users.

I found out that adding a two dimensional element without defining
first dimension existing doesn't work:

>>> data = {}
>>> data['one']['two'] = 'three'
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
KeyError: 'one'
>>> data['one'] = {}
>>> data['one']['two'] = 'three'
>>> print data
{'one': {'two': 'three'}}

And through some research, I discovered collections.defaultdict (new
in Python 2.5, FWIW):

>>> import collections
>>> data = collections.defaultdict(dict)
>>> data['one']['two'] = 'three'
>>> print data
defaultdict(<type 'dict'>, {'one': {'two': 'three'}})

Why isn't the behavior of collections.defaultdict the default for a
dict?
Am I just revelling in my bad perl habits by not wanting to declare a
previous level first?
Is this sort of "more rigid" way of doing things common throughout
python, and is it best that I not fight it, but embrace it?

Your thoughts and comments are very much appreciated. I think my brain
already knows some of the answers, but my heart ... well, perl and I
go way back. Loving python so far, though.

Pete


From greg.ewing at canterbury.ac.nz  Fri Mar  5 20:39:25 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sat, 06 Mar 2010 14:39:25 +1300
Subject: Generic singleton
In-Reply-To: <4b9146e6$0$27863$c3e8da3@news.astraweb.com>
References: <mailman.222.1267642515.23598.python-list@python.org>	<pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>	<Xns9D317DB33C63Aduncanbooth@127.0.0.1>	<4b907b5e$0$27863$c3e8da3@news.astraweb.com>	<mailman.354.1267808250.23598.python-list@python.org>
	<4b9146e6$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <7vdpf2FqgU1@mid.individual.net>

I think the important difference between None and booleans
wrt singleton behaviour is that things are often compared
with None using "is", so it's quite important that there
only be one instance of NoneType around, and it makes
sense not to give people the false impression that they
can create another one.

Re-using predefined True and False instances is more of
a performance optimisation, however -- they're not usually
compared for identity, or even compared at all for that
matter. So there's no particular reason to disallow
calling bool().

In fact, there's an excellent reason to *allow* calling
it: not only is bool a type, it's also often used as a
function to coerce things to a boolean value:

    >>> bool(['hello'])
    True

There's no equivalent reason to make NoneType callable,
as coercing something to None makes very little sense.

-- 
Greg


From greg.ewing at canterbury.ac.nz  Fri Mar  5 20:45:58 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sat, 06 Mar 2010 14:45:58 +1300
Subject: Generic singleton
In-Reply-To: <4b918ec8$0$27863$c3e8da3@news.astraweb.com>
References: <mailman.222.1267642515.23598.python-list@python.org>	<pan.2010.03.04.02.14.17@REMOVE.THIS.cybersource.com.au>	<Xns9D317DB33C63Aduncanbooth@127.0.0.1>	<4b907b5e$0$27863$c3e8da3@news.astraweb.com>	<mailman.354.1267808250.23598.python-list@python.org>	<4b9146e6$0$27863$c3e8da3@news.astraweb.com>	<mailman.384.1267824375.23598.python-list@python.org>
	<4b918ec8$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <7vdpraF2glU1@mid.individual.net>

Steven D'Aprano wrote:

> While Doubleton or even Tripleton sound cute, once you get to large 
> counts it all starts getting ugly and horrible. "Polyton"? Blah.

Tupleton?

-- 
Greg


From usenot at geekmail.INVALID  Fri Mar  5 21:02:58 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Sat, 6 Mar 2010 03:02:58 +0100
Subject: best practices: is collections.defaultdict my friend or not?
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
Message-ID: <20100306030258.01d324b7@geekmail.INVALID>

On Fri, 5 Mar 2010 17:22:14 -0800 (PST) Pete Emerson
<pemerson at gmail.com> wrote:

> I've been wrestling with dicts. I hope at the very least what I
> discovered helps someone else out, but I'm interested in hearing from
> more learned python users.
> 
> I found out that adding a two dimensional element without defining
> first dimension existing doesn't work:
> 
> >>> data = {}
> >>> data['one']['two'] = 'three'
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> KeyError: 'one'
Yeah, because that key 'one' indexes what exactly?


> [snip]
> 
> And through some research, I discovered collections.defaultdict (new
> in Python 2.5, FWIW):
> 
> [snip]
> 
> Why isn't the behavior of collections.defaultdict the default for a
> dict?
Because explicit is better than implicit. How should Python know what
you want to fill your dict with? It could be anything that takes string
indices. Only two lines of code remove all the guesswork.


> Am I just revelling in my bad perl habits by not wanting to declare a
> previous level first?
Yes.

Python pretty much never guesses (not that I knew of anyway). I think
that is good, because it's just too easy to overlook some magic the
language does and spend an hour trying to understand why that Toyota
hit that wall.


> Is this sort of "more rigid" way of doing things common throughout
> python, and is it best that I not fight it, but embrace it?
> 
Seriously, what answer do you expect? ;) When has fighting a language
ever brought about something really cool. (I'm really looking forward
to the geeky humorous replies this is bound to sprout.)



> Your thoughts and comments are very much appreciated. I think my brain
> already knows some of the answers, but my heart ... well, perl and I
> go way back. Loving python so far, though.
> 
Welcome on board.

Have you typed "import this" in the command prompt yet?



-- 
INVALID? DE!



From mensanator at aol.com  Fri Mar  5 21:09:59 2010
From: mensanator at aol.com (Mensanator)
Date: Fri, 5 Mar 2010 18:09:59 -0800 (PST)
Subject: Slicing [N::-1]
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>
	<m2wrxqzlhm.fsf@googlemail.com>
	<4b914d35$0$27863$c3e8da3@news.astraweb.com> 
	<f2b985f4-f83d-4df4-a7ab-135fc18296c7@q23g2000yqd.googlegroups.com> 
	<mailman.386.1267825329.23598.python-list@python.org>
	<ca702be2-3307-41a9-85b9-d1cf6a49a049@q16g2000yqq.googlegroups.com>
	<mailman.395.1267835669.23598.python-list@python.org>
Message-ID: <83e3ccd0-29d6-4aec-8590-a38e6daba56d@g26g2000yqn.googlegroups.com>

On Mar 5, 6:34?pm, Gary Herron <gher... at islandtraining.com> wrote:
> Mensanator wrote:
> > On Mar 5, 3:42 pm, Gary Herron <gher... at islandtraining.com> wrote:
>
> >> Mensanator wrote:
>
> >>> The only way to get a 0 from a reverse range() is to have a bound of
> >>> -1.
>
> >> Not quite. ?An empty second bound goes all the way to the zero index:
>
> > Not the same thing. You're using the bounds of the slice index.
> > I was refering to the bounds of the range() function.
>
> >>>> for a in range(9,-9,-1):print(a,end=' ')
>
> > 9 8 7 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 -7 -8
>
> > To get that to stop at 0, you use a -1 as the bounds:
>
> >>>> for a in range(9,-1,-1):print(a,end=' ')
>
> > 9 8 7 6 5 4 3 2 1 0
>
> > Your slice notation only works if the last (first?) number in
> > the range happens to be 0. What if the range bounds were variables?
> > You may still want to force the range's last number to be 0 by
> > using a constant like range(a,-1,-1) rather than just take
> > the last number of range(a,b,-1) by using slice notation.
>
> All true ?and valid of course, but I was just contridicting the "the
> ONLY way to get a 0" (emphasis mine) part of the statement.

Does it still contradict if you do not use the '::' as the OP
requested?

>
> Gary Herron
>
>
>
>
>
> >> ?>>> range(9)[2::-1]
> >> [2, 1, 0]
>
> >> Gary Herron- Hide quoted text -
>
> - Show quoted text -- Hide quoted text -
>
> - Show quoted text -



From usenot at geekmail.INVALID  Fri Mar  5 21:10:03 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Sat, 6 Mar 2010 03:10:03 +0100
Subject: best practices: is collections.defaultdict my friend or not?
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
Message-ID: <20100306031003.1018aab2@geekmail.INVALID>

On Fri, 5 Mar 2010 17:22:14 -0800 (PST) Pete Emerson
<pemerson at gmail.com> wrote:

> [snip]
> >>> data['one'] = {}
> >>> data['one']['two'] = 'three'
> >>> print data
> {'one': {'two': 'three'}}
> 
> And through some research, I discovered collections.defaultdict (new
> in Python 2.5, FWIW):
> 
> >>> import collections
> >>> data = collections.defaultdict(dict)
> >>> data['one']['two'] = 'three'
> >>> print data
> defaultdict(<type 'dict'>, {'one': {'two': 'three'}})
> 
> [snip]
> Your thoughts and comments are very much appreciated. I think my brain
> already knows some of the answers, but my heart ... well, perl and I
> go way back. Loving python so far, though.
> 

Oh, by the way: That defaultdict route is a pretty solid solution. Not
sure what problem you're trying to solve -- depending on your usecase,
there might be a better approach.

If you're just asking hypothetically and you're trying to apply a
Perl idiom to Python, there probably *is* a better solution.

/W

-- 
INVALID? DE!



From ckaynor at zindagigames.com  Fri Mar  5 21:20:42 2010
From: ckaynor at zindagigames.com (Chris Kaynor)
Date: Fri, 5 Mar 2010 18:20:42 -0800
Subject: best practices: is collections.defaultdict my friend or not?
In-Reply-To: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
Message-ID: <a03c8d051003051820g5e7863d8t82a2a4886db6949@mail.gmail.com>

On Fri, Mar 5, 2010 at 5:22 PM, Pete Emerson <pemerson at gmail.com> wrote:

> I've been wrestling with dicts. I hope at the very least what I
> discovered helps someone else out, but I'm interested in hearing from
> more learned python users.
>
> I found out that adding a two dimensional element without defining
> first dimension existing doesn't work:
>
> >>> data = {}
> >>> data['one']['two'] = 'three'
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
> KeyError: 'one'
> >>> data['one'] = {}
> >>> data['one']['two'] = 'three'
> >>> print data
> {'one': {'two': 'three'}}
>
>
Perhaps a better idiom for what you are doing would be to use tuples as the
keys: (I don't have a handy Python interpreter, so untested)
data = {}
data[('one', 'two')] = 'three'
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From python at mrabarnett.plus.com  Fri Mar  5 21:26:39 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 06 Mar 2010 02:26:39 +0000
Subject: best practices: is collections.defaultdict my friend or not?
In-Reply-To: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
Message-ID: <4B91BD5F.1020304@mrabarnett.plus.com>

Pete Emerson wrote:
> I've been wrestling with dicts. I hope at the very least what I
> discovered helps someone else out, but I'm interested in hearing from
> more learned python users.
> 
> I found out that adding a two dimensional element without defining
> first dimension existing doesn't work:
> 
>>>> data = {}
>>>> data['one']['two'] = 'three'
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> KeyError: 'one'
>>>> data['one'] = {}
>>>> data['one']['two'] = 'three'
>>>> print data
> {'one': {'two': 'three'}}
> 
> And through some research, I discovered collections.defaultdict (new
> in Python 2.5, FWIW):
> 
>>>> import collections
>>>> data = collections.defaultdict(dict)
>>>> data['one']['two'] = 'three'
>>>> print data
> defaultdict(<type 'dict'>, {'one': {'two': 'three'}})
> 
> Why isn't the behavior of collections.defaultdict the default for a
> dict?
> Am I just revelling in my bad perl habits by not wanting to declare a
> previous level first?
> Is this sort of "more rigid" way of doing things common throughout
> python, and is it best that I not fight it, but embrace it?
> 
> Your thoughts and comments are very much appreciated. I think my brain
> already knows some of the answers, but my heart ... well, perl and I
> go way back. Loving python so far, though.
> 
Someone once wrote about a case where he was porting a frontend from
Perl to Python. It called a backend and parsed the result. Sometimes
converting one of the fields to a number would raise a ValueError
because it would contain "ERR" instead of a number, which Perl, of
course, would silently convert to 0!

Python is all about refusing to guess, and complaining if there's an
error. :-)


From pemerson at gmail.com  Fri Mar  5 21:30:47 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 18:30:47 -0800 (PST)
Subject: best practices: is collections.defaultdict my friend or not?
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
	<20100306031003.1018aab2@geekmail.INVALID>
Message-ID: <3ae40c74-7bee-4c6c-9ed2-7a73675f8040@v20g2000prb.googlegroups.com>

On Mar 5, 6:10?pm, Andreas Waldenburger <use... at geekmail.INVALID>
wrote:
> On Fri, 5 Mar 2010 17:22:14 -0800 (PST) Pete Emerson
>
>
>
>
>
> <pemer... at gmail.com> wrote:
> > [snip]
> > >>> data['one'] = {}
> > >>> data['one']['two'] = 'three'
> > >>> print data
> > {'one': {'two': 'three'}}
>
> > And through some research, I discovered collections.defaultdict (new
> > in Python 2.5, FWIW):
>
> > >>> import collections
> > >>> data = collections.defaultdict(dict)
> > >>> data['one']['two'] = 'three'
> > >>> print data
> > defaultdict(<type 'dict'>, {'one': {'two': 'three'}})
>
> > [snip]
> > Your thoughts and comments are very much appreciated. I think my brain
> > already knows some of the answers, but my heart ... well, perl and I
> > go way back. Loving python so far, though.
>
> Oh, by the way: That defaultdict route is a pretty solid solution. Not
> sure what problem you're trying to solve -- depending on your usecase,
> there might be a better approach.
>
> If you're just asking hypothetically and you're trying to apply a
> Perl idiom to Python, there probably *is* a better solution.
>
> /W
>
> --
> INVALID? DE!

I found out about the need to declare the higher level as I was
reading in a JSON struct into a dict and then adding a new entry at a
lower level. Mostly just proof of concept stuff as I'm learning
python. I'm not sure that the use of defaultdict is really warranted
for me anywhere just yet. Mostly, I don't want to convert my perl to
python, that seems very counterproductive. Thank you very much for
your insight.

I was a little frightened of doing "import this" ("Hey, kid, run rm -
rf / and see what happens!"), but did, and the words are wise. :)

Pete


From alfps at start.no  Fri Mar  5 21:32:48 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Sat, 06 Mar 2010 03:32:48 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.209.1267635630.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<mailman.209.1267635630.23598.python-list@python.org>
Message-ID: <hmsesl$57k$1@news.eternal-september.org>

* Robert Kern:
> On 2010-03-03 09:39 AM, Mike Kent wrote:
>> What's the compelling use case for this vs. a simple try/finally?
>>
>>     original_dir = os.getcwd()
>>     try:
>>         os.chdir(somewhere)
>>         # Do other stuff
>>     finally:
>>         os.chdir(original_dir)
>>         # Do other cleanup
> 
> A custom-written context manager looks nicer and can be more readable.
> 
> from contextlib import contextmanager
> import os
> 
> @contextmanager
> def pushd(path):
>     original_dir = os.getcwd()
>     os.chdir(path)
>     try:
>         yield
>     finally:
>         os.chdir(original_dir)
> 
> 
> with pushd(somewhere):
>     ...
> 
> 
> I don't think a general purpose ScopeGuard context manager has any such 
> benefits over the try: finally:, though.

class pushd( Cleanup ):
     def __init__( self, path ):
         original_dir = os.getcwd()
         os.chdir( path )
         self._actions.append( lambda: os.chdir( original_dir ) )


Disclaimer: haven't tested this, but it just occurred to me that for such small 
init/cleanup wrappers the Cleanup class provides a nice alternative to 
@contextmanager, as above: fewer lines, and perhaps even more clear code. :-)


Cheers,

- Alf


From no.email at nospam.invalid  Fri Mar  5 21:53:46 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Fri, 05 Mar 2010 18:53:46 -0800
Subject: best practices: is collections.defaultdict my friend or not?
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
Message-ID: <7xlje6rwhx.fsf@ruckus.brouhaha.com>

Pete Emerson <pemerson at gmail.com> writes:
> I found out that adding a two dimensional element without defining
> first dimension existing doesn't work:
>
>>>> data = {}
>>>> data['one']['two'] = 'three'

You can use a tuple as a subscript if you want:

    data = {}
    data['one','two'] = 'three'


From gherron at islandtraining.com  Fri Mar  5 22:05:20 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Fri, 05 Mar 2010 19:05:20 -0800
Subject: Slicing [N::-1]
In-Reply-To: <83e3ccd0-29d6-4aec-8590-a38e6daba56d@g26g2000yqn.googlegroups.com>
References: <90fc5b42-b83a-41fc-9b1a-929d88a649cc@g19g2000yqe.googlegroups.com>	<m2wrxqzlhm.fsf@googlemail.com>	<4b914d35$0$27863$c3e8da3@news.astraweb.com>
	<f2b985f4-f83d-4df4-a7ab-135fc18296c7@q23g2000yqd.googlegroups.com>
	<mailman.386.1267825329.23598.python-list@python.org>	<ca702be2-3307-41a9-85b9-d1cf6a49a049@q16g2000yqq.googlegroups.com>	<mailman.395.1267835669.23598.python-list@python.org>
	<83e3ccd0-29d6-4aec-8590-a38e6daba56d@g26g2000yqn.googlegroups.com>
Message-ID: <4B91C670.3060305@islandtraining.com>

Mensanator wrote:
> On Mar 5, 6:34 pm, Gary Herron <gher... at islandtraining.com> wrote:
>   
>> Mensanator wrote:
>>     
>>> On Mar 5, 3:42 pm, Gary Herron <gher... at islandtraining.com> wrote:
>>>       
>>>> Mensanator wrote:
>>>>         
>>>>> The only way to get a 0 from a reverse range() is to have a bound of
>>>>> -1.
>>>>>           
>>>> Not quite.  An empty second bound goes all the way to the zero index:
>>>>         
>>> Not the same thing. You're using the bounds of the slice index.
>>> I was refering to the bounds of the range() function.
>>>       
>>>>>> for a in range(9,-9,-1):print(a,end=' ')
>>>>>>             
>>> 9 8 7 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 -7 -8
>>>       
>>> To get that to stop at 0, you use a -1 as the bounds:
>>>       
>>>>>> for a in range(9,-1,-1):print(a,end=' ')
>>>>>>             
>>> 9 8 7 6 5 4 3 2 1 0
>>>       
>>> Your slice notation only works if the last (first?) number in
>>> the range happens to be 0. What if the range bounds were variables?
>>> You may still want to force the range's last number to be 0 by
>>> using a constant like range(a,-1,-1) rather than just take
>>> the last number of range(a,b,-1) by using slice notation.
>>>       
>> All true  and valid of course, but I was just contridicting the "the
>> ONLY way to get a 0" (emphasis mine) part of the statement.
>>     
>
> Does it still contradict if you do not use the '::' as the OP
> requested?
>   

Not to my knowledge...  I believe your statement is true in all cases 
which explicitly state the stop value.


>   
>> Gary Herron
>>
>>
>>
>>
>>
>>     
>>>>  >>> range(9)[2::-1]
>>>> [2, 1, 0]
>>>>         
>>>> Gary Herron- Hide quoted text -
>>>>         
>> - Show quoted text -- Hide quoted text -
>>
>> - Show quoted text -
>>     
>
>   



From steve at REMOVE-THIS-cybersource.com.au  Fri Mar  5 23:24:32 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 06 Mar 2010 04:24:32 GMT
Subject: best practices: is collections.defaultdict my friend or not?
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
Message-ID: <4b91d900$0$27863$c3e8da3@news.astraweb.com>

On Fri, 05 Mar 2010 17:22:14 -0800, Pete Emerson wrote:

> Why isn't the behavior of collections.defaultdict the default for a
> dict?

Why would it be?

If you look up a key in a dict:

addressbook['Barney Rubble']

and you don't actually have Barney's address, should Python guess and 
make something up?

In general, looking up a missing key is an error, and errors should never 
pass silently unless explicitly silenced.

And for those cases where missing keys are not errors, you're spoiled for 
choice:

dict.get
dict.setdefault
collections.defaultdict

try:
    dict[key]
except KeyError:
    do something else

Or even:

if key in dict:
    dict[key]
else:
    do something else




-- 
Steven


From pemerson at gmail.com  Sat Mar  6 00:36:39 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 21:36:39 -0800 (PST)
Subject: best practices: is collections.defaultdict my friend or not?
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
	<4b91d900$0$27863$c3e8da3@news.astraweb.com>
Message-ID: <6048eb76-9dca-4509-ad7e-f65040128ebb@b36g2000pri.googlegroups.com>

On Mar 5, 8:24?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Fri, 05 Mar 2010 17:22:14 -0800, Pete Emerson wrote:
> > Why isn't the behavior of collections.defaultdict the default for a
> > dict?
>
> Why would it be?
>
> If you look up a key in a dict:
>
> addressbook['Barney Rubble']
>
> and you don't actually have Barney's address, should Python guess and
> make something up?
>
> In general, looking up a missing key is an error, and errors should never
> pass silently unless explicitly silenced.
>
> And for those cases where missing keys are not errors, you're spoiled for
> choice:
>
> dict.get
> dict.setdefault
> collections.defaultdict
>
> try:
> ? ? dict[key]
> except KeyError:
> ? ? do something else
>
> Or even:
>
> if key in dict:
> ? ? dict[key]
> else:
> ? ? do something else
>
> --
> Steven

My frame of reference for the past 10 < N < 15 years has been doing
this sort of assignment in perl:

$hash{key1}{key2} = value

I definitely agree that looking up a missing key should give an error.
The lazy perl programmer in me just wants to make an assignment to a
missing second key without defining the first key first. I'm not
saying it's right, I'm saying that it's something I'm trying to
unlearn, as I'm being convinced that it's the "best way" to do it in
python.

I'll take a look at dict.get and dict.setdefault, thank you for those.

I'm learning, and you're all very helpful, and I appreciate it!

Pete


From pemerson at gmail.com  Sat Mar  6 00:42:37 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 5 Mar 2010 21:42:37 -0800 (PST)
Subject: best practices: is collections.defaultdict my friend or not?
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
	<mailman.399.1267842408.23598.python-list@python.org>
Message-ID: <c185da34-716b-4df4-af76-c1214df37f2a@q2g2000pre.googlegroups.com>

On Mar 5, 6:26?pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
> Pete Emerson wrote:
> > I've been wrestling with dicts. I hope at the very least what I
> > discovered helps someone else out, but I'm interested in hearing from
> > more learned python users.
>
> > I found out that adding a two dimensional element without defining
> > first dimension existing doesn't work:
>
> >>>> data = {}
> >>>> data['one']['two'] = 'three'
> > Traceback (most recent call last):
> > ? File "<stdin>", line 1, in <module>
> > KeyError: 'one'
> >>>> data['one'] = {}
> >>>> data['one']['two'] = 'three'
> >>>> print data
> > {'one': {'two': 'three'}}
>
> > And through some research, I discovered collections.defaultdict (new
> > in Python 2.5, FWIW):
>
> >>>> import collections
> >>>> data = collections.defaultdict(dict)
> >>>> data['one']['two'] = 'three'
> >>>> print data
> > defaultdict(<type 'dict'>, {'one': {'two': 'three'}})
>
> > Why isn't the behavior of collections.defaultdict the default for a
> > dict?
> > Am I just revelling in my bad perl habits by not wanting to declare a
> > previous level first?
> > Is this sort of "more rigid" way of doing things common throughout
> > python, and is it best that I not fight it, but embrace it?
>
> > Your thoughts and comments are very much appreciated. I think my brain
> > already knows some of the answers, but my heart ... well, perl and I
> > go way back. Loving python so far, though.
>
> Someone once wrote about a case where he was porting a frontend from
> Perl to Python. It called a backend and parsed the result. Sometimes
> converting one of the fields to a number would raise a ValueError
> because it would contain "ERR" instead of a number, which Perl, of
> course, would silently convert to 0!
>
> Python is all about refusing to guess, and complaining if there's an
> error. :-)

Perl is quite an amazing language, but it also definitely allows for
sloppy habits and poor coding behaviors, particularly for someone such
as me whose perl is completely self taught. I think that's why this
time around with python I'm trying to learn my prior experience and
seek help in areas where I suspect there is improvement to be made.
I'm really liking the rigid flexibility I'm experiencing with python
so far.

I'm thinking it's time for me to get a python reference or two, just
to kill a few trees. If anyone has any strong feelings about what
belongs in a "beginner but already learning quickly" library, please
toss them my way. I'll grep around the 'net for opinions on it, too.

Pete


From darcy at druid.net  Sat Mar  6 01:55:48 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Sat, 6 Mar 2010 01:55:48 -0500
Subject: My four-yorkshireprogrammers contribution
In-Reply-To: <7vdo8sFrelU1@mid.individual.net>
References: <20100224212303.242222c6@geekmail.INVALID>
	<eq4l57-okf2.ln1@ozzie.tundraware.com>
	<20100226173907.5567609f@geekmail.INVALID>
	<mailman.285.1267208717.4577.python-list@python.org>
	<hm9cbc$9p4$1@speranza.aioe.org> <7uu1ooFiipU1@mid.individual.net>
	<4B89D8BE.2040905@mrabarnett.plus.com> <4B8B9845.70604@sequans.com>
	<mailman.59.1267456634.23598.python-list@python.org>
	<7v695nFa0fU1@mid.individual.net>
	<mailman.189.1267627321.23598.python-list@python.org>
	<7v9e3rFl7mU1@mid.individual.net>
	<mailman.294.1267719244.23598.python-list@python.org>
	<7vdo8sFrelU1@mid.individual.net>
Message-ID: <20100306015548.4e510039.darcy@druid.net>

On Sat, 06 Mar 2010 14:19:03 +1300
Gregory Ewing <greg.ewing at canterbury.ac.nz> wrote:
> MRAB wrote:
> > By the standards of just a few years later, that's not so much a
> > microcomputer as a nanocomputer!
> 
> Although not quite as nano as another design published
> in EA a couple of years earlier, the EDUC-8:

Byte Magazine once published plans for building a computer that had one
instruction.  I believe it was a six bit address so that would make it
a max of 64 bytes.  If I recall, the single instruction was "SUBTRACT
AND JUMP ON CARRY."  Now that's nano!

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


From pmaupin at gmail.com  Sat Mar  6 02:21:45 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Fri, 5 Mar 2010 23:21:45 -0800 (PST)
Subject: Initial RSON prototype parser in subversion
References: <mailman.34.1267409372.23598.python-list@python.org>
Message-ID: <bdf3e3d2-43fa-43f9-819a-cf1bcf173c78@15g2000yqi.googlegroups.com>

I have not yet added indentation sensitivity to the parser (although
the tokenizer saves the indentation information for the parser), but
the initial prototype parses all of JSON plus a lot of syntax
enhancements (comments, hex/binary/octal numbers, relaxed quoting
requirements for strings, trailing comments allowed, triple-quoted
strings, etc.)

I have also started the rson-discuss group on google for further
discussions on the actual syntax and initial implementation, if anyone
is interested, and have posted a message there with a bit more
information about the prototype status.

The project page is at http://code.google.com/p/rson/

Best regards,
Pat


From strombrg at gmail.com  Sat Mar  6 03:21:59 2010
From: strombrg at gmail.com (Dan Stromberg)
Date: Sat, 6 Mar 2010 00:21:59 -0800 (PST)
Subject: Fast GUI pipemeter: gprog
References: <619ab895-87a9-4b40-b45e-b12299304b38@z1g2000prc.googlegroups.com>
	<1686070.lZ2vcFHjTE@xkzjympik>
	<c2936c0c-fb6c-4666-a140-977179692e0a@x1g2000prb.googlegroups.com>
Message-ID: <44626216-1aeb-491b-9ee4-c0ed79a7ab88@b9g2000pri.googlegroups.com>

On Mar 4, 4:25?pm, Dan Stromberg <strom... at gmail.com> wrote:

> Python folk: Any guesses why a simple file.read(blocksize) would have
> such an affinity for returning 16K when redirected from /dev/zero? ?If
> I run the program against a file on disk, it gets larger blocksizes
> fine.

Never mind - it was a bug in my code.

Now on a slower machine, it runs about 2.5 times faster than it did on
the faster machine.


From wongjoekmeu at yahoo.com  Sat Mar  6 04:45:46 2010
From: wongjoekmeu at yahoo.com (wongjoekmeu at yahoo.com)
Date: Sat, 6 Mar 2010 01:45:46 -0800 (PST)
Subject: start function in new process
References: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>
	<hmrmn5$d74$1@news.eternal-september.org>
	<86d891a9-b6aa-4de9-a0f5-314867fdf75d@q21g2000yqm.googlegroups.com>
	<hmro0l$lld$1@news.eternal-september.org>
	<3f2cc4f0-b21a-4886-a81c-5b503610ac2d@e7g2000yqf.googlegroups.com>
	<hmrq8j$3n8$1@news.eternal-september.org>
Message-ID: <04188082-bc7f-4b65-bfde-dc7abe5e8123@t41g2000yqt.googlegroups.com>

On 5 mrt, 21:40, "Martin P. Hellwig" <martin.hell... at dcuktec.org>
wrote:
> On 03/05/10 20:09, wongjoek... at yahoo.com wrote:
>
>
>
> > On 5 mrt, 21:02, "Martin P. Hellwig"<martin.hell... at dcuktec.org>
> > wrote:
> >> On 03/05/10 19:45, wongjoek... at yahoo.com wrote:
>
> >>> On 5 mrt, 20:40, "Martin P. Hellwig"<martin.hell... at dcuktec.org>
> >>> wrote:
> >>>> On 03/05/10 19:21, wongjoek... at yahoo.com wrote:
> >>>> <cut os.fork problem>
> >>>> Any specific reason why threading.Thread or multiprocessing is not
> >>>> suitable to solve your problem?
>
> >>>> --
> >>>> mph
>
> >>> Because I got a memory leak in my function f(). It uses scipy, numpy,
> >>> pylab, and I am not planning to solve the memory leak because its too
> >>> complicated. So I thought of just calling the function then when it is
> >>> finished the process is gone and all memory is released. With
> >>> threading I don't think I would solve this problem. I am not sure
> >>> though.
>
> >> I would be surprised if you can't do the same with
> >> subprocess/multiprocessing, since you seem to know how to identify the
> >> memory leak it shouldn't be a problem scripting out a test to see if it
> >> works this way. I would be interested though in your findings.
>
> >> --
> >> mph
>
> > I can't use multiprocessing module since it comes only with python 2.6
> > and I am bound to python2.4. But subprocess does exist in python2.4,
> > but the question now is, how do I achieve that ? Any example ?
>
> Sure, for example if I want to check the openssl version (didn't specify
> I need to provide a useful example :-)
>
> I would normally do on the command line:
> [martin at aspire8930 /usr/home/martin/Desktop]$ /usr/bin/openssl version
> OpenSSL 0.9.8k 25 Mar 2009
>
> The python subprocess equivalent is:
> [martin at aspire8930 /usr/home/martin/Desktop]$ python
> Python 2.6.4 (r264:75706, Jan 31 2010, 20:52:16)
> [GCC 4.2.1 20070719 ?[FreeBSD]] on freebsd8
> Type "help", "copyright", "credits" or "license" for more information.
> ?>>> import subprocess as _sp
> ?>>> ssl_version = _sp.Popen(['/usr/bin/openssl', 'version'],
> stdout=_sp.PIPE)
> ?>>> print(ssl_version.stdout.readlines())
> ['OpenSSL 0.9.8k 25 Mar 2009\n']
> ?>>> quit()
> [martin at aspire8930 /usr/home/martin/Desktop]$
>
> If you get any error in the Popen part, you probably did not use the
> full path or an illegal parameter.
>
> If you get a long wait in the readlines part, this usually means that
> there is either nothing written to stdout or something is still being
> written (I am not sure about this part though, it has been a while).
>
> hth
> --
> mph

Yes, I saw this example also before. HOwever what I want is to call an
internal function which gets a reference of another internal function
as input and not calling an external program. Do you have any example
on that with subprocess module ?
Thanks.


From isso.moh at gmail.com  Sat Mar  6 05:39:09 2010
From: isso.moh at gmail.com (mohamed issolah)
Date: Sat, 6 Mar 2010 11:39:09 +0100
Subject: compiler with python
Message-ID: <d698368f1003060239g1b4393c5v632b07b833a28df@mail.gmail.com>

hey,

How can I construct a compiler with python just for informatiom ., I have
habit to construct it with C language,

sorry for my english ;-)
-- 
issolah mohamed
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From acm at muc.de  Sat Mar  6 06:20:11 2010
From: acm at muc.de (Alan Mackenzie)
Date: Sat, 6 Mar 2010 11:20:11 +0000 (UTC)
Subject: Building Python-2.6.4 on G/L: can't build in _ssl support.
Message-ID: <hmtdpb$d7q$1@colin2.muc.de>

Hi, Python!

I build Python-2.6.4 on my GNU/Linux (Debian Sarge) box.  I get a warning
message "Failed to find the necessary bits to build these modules: ....
_ssl ...  RTFS to find out what!".

I need _ssl for an application.  So, I look at setup.py in the top
directory.  It seems that _ssl needs to find certain .h files, but is
looking in /usr/local/ssl and /usr/contrib (or subdirectories thereof).
These look like highly non-standard directories.

Either something is hugely amiss, or I'm missing some vital nugget of
information (possibly through not being a Python hacker).

Would somebody please give me a tip to get this sorted out?  Thanks!

-- 
Alan Mackenzie (Nuremberg, Germany).



From davea at ieee.org  Sat Mar  6 06:37:12 2010
From: davea at ieee.org (Dave Angel)
Date: Sat, 06 Mar 2010 06:37:12 -0500
Subject: compiler with python
In-Reply-To: <d698368f1003060239g1b4393c5v632b07b833a28df@mail.gmail.com>
References: <d698368f1003060239g1b4393c5v632b07b833a28df@mail.gmail.com>
Message-ID: <4B923E68.1000104@ieee.org>

mohamed issolah wrote:
> hey,
>
> How can I construct a compiler with python just for informatiom ., I have
> habit to construct it with C language,
>
> sorry for my english ;-)
>   
You need to tell us what you're really trying to do, what tools you're 
willing to use, and probably why you want it.  And if you're not sure 
about your English, keep the sentence structure straightforward.

Let me make a couple of wild guesses:

You want to design and build a compiler that takes xml information as 
its source code, and compiles those xml files into Intel x86 machine 
code.  The compiler and the resulting executable needs to run on an x86 
Linux machine.  Your previous experience was in doing this sort of thing 
in C, but you want to try it with Python instead.  You want to do it 
without using the lxml libraries.

You want to build a python compiler, that takes python source code and 
produces Java byte code files.  You'd like to do this in C, but don't 
want to use any of the available existing CPython or Jython source 
code.  Your goal is not to make a commercially viable product, but to 
learn as much as possible in the process.


DaveA


From python at hope.cz  Sat Mar  6 06:53:53 2010
From: python at hope.cz (Johny)
Date: Sat, 6 Mar 2010 03:53:53 -0800 (PST)
Subject: Import problem
Message-ID: <6630f859-b85d-4841-b1d5-2a563dca9cbb@q15g2000yqj.googlegroups.com>

I have this directory structure

C:
      \A
         __init__.py
         amodule.py

         \B
          __init__.py
          bmodule.py

           \D
            __init__.py
            dmodule.py

and  I want to import  bmodule.py
C:\>cd \

C:\>python
Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
(Intel)] on win
32
Type "help", "copyright", "credits" or "license" for more information.
>>> from A.B import  bmodule
I am bmodule
>>>
C:\>

so far so good. Now I would like to import bmodule but if the current
directory is \D subdirectory.

C:> cd \A\B\D
C:\A\B\D>
C:\A\B\D>python
Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
(Intel)] on win
32
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.path.append('C:\\A')
>>> from A.B import bmodule
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named A.B

C:\>

so I can not import a module from the parent directory? Or where did I
make an error?
Thanks for help

L.


From martin.hellwig at dcuktec.org  Sat Mar  6 07:28:25 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Sat, 06 Mar 2010 12:28:25 +0000
Subject: start function in new process
In-Reply-To: <04188082-bc7f-4b65-bfde-dc7abe5e8123@t41g2000yqt.googlegroups.com>
References: <121035de-e4be-4967-824a-dbd57d20f2f6@q16g2000yqq.googlegroups.com>
	<hmrmn5$d74$1@news.eternal-september.org>
	<86d891a9-b6aa-4de9-a0f5-314867fdf75d@q21g2000yqm.googlegroups.com>
	<hmro0l$lld$1@news.eternal-september.org>
	<3f2cc4f0-b21a-4886-a81c-5b503610ac2d@e7g2000yqf.googlegroups.com>
	<hmrq8j$3n8$1@news.eternal-september.org>
	<04188082-bc7f-4b65-bfde-dc7abe5e8123@t41g2000yqt.googlegroups.com>
Message-ID: <hmthp5$rbo$1@news.eternal-september.org>

On 03/06/10 09:45, wongjoekmeu at yahoo.com wrote:
<cut>
>
> Yes, I saw this example also before. HOwever what I want is to call an
> internal function which gets a reference of another internal function
> as input and not calling an external program. Do you have any example
> on that with subprocess module ?
> Thanks.

Well yes that is possible but you would more or less be just reinventing 
parts of the multiprocessing module, so I would use that one (at the 
location Robert Kern suggested).

-- 
mph


From isso.moh at gmail.com  Sat Mar  6 08:07:30 2010
From: isso.moh at gmail.com (mohamed issolah)
Date: Sat, 6 Mar 2010 14:07:30 +0100
Subject: compiler with python
Message-ID: <d698368f1003060507g13ee8d5ck9c2aff6c0388d49c@mail.gmail.com>

hey,

I want to create a compiler which transform a code like pascal code (that
what I do in C) to "quad"
In C, I use BISON and FLEX tools.
-- 
issolah mohamed
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From kse.listed.co1 at gmail.com  Sat Mar  6 08:33:34 2010
From: kse.listed.co1 at gmail.com (Naeem)
Date: Sat, 6 Mar 2010 05:33:34 -0800 (PST)
Subject: "olivia wilde" "olivia williams" "olivia" "olivia" "olivia" "virgin 
	women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
	"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no 
	clothes" "torrie wilson 2009" "
Message-ID: <a7be4681-06b3-4971-8cc9-cb3b86dfe992@b36g2000pri.googlegroups.com>

"olivia wilde" "olivia williams" "olivia" "olivia" "olivia" "virgin
women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" ""olivia wilde" "olivia williams"
"olivia" "olivia" "olivia" "virgin women" "virgin girl test" on
http://sexyandpretty-girls.blogspot.com/          "torrie wilson
playboy march 2004" "torrie wilson" "torrie wilson no clothes" "torrie
wilson 2009" ""olivia wilde" "olivia williams" "olivia" "olivia"
"olivia" "virgin women" "virgin girl test" on http://sexyandpretty-girls.blogspot.com/
"torrie wilson playboy march 2004" "torrie wilson" "torrie wilson no
clothes" "torrie wilson 2009" "


From steve at REMOVE-THIS-cybersource.com.au  Sat Mar  6 09:48:24 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 06 Mar 2010 14:48:24 GMT
Subject: Import problem
References: <6630f859-b85d-4841-b1d5-2a563dca9cbb@q15g2000yqj.googlegroups.com>
Message-ID: <4b926b37$0$27829$c3e8da3@news.astraweb.com>

On Sat, 06 Mar 2010 03:53:53 -0800, Johny wrote:

>>>> import sys
>>>> sys.path.append('C:\\A')
>>>> from A.B import bmodule
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> ImportError: No module named A.B

The current directory is irrelevant, except that it is automatically 
added to the PYTHONPATH. That's why you can import A.B when the current 
directory is C.

You are trying to import module B from package A *inside* directory C:\A, 
but there is no such package A inside C:\A. You need to add C to the 
path, and then it should work.




-- 
Steven


From bdesth.quelquechose at free.quelquepart.fr  Sat Mar  6 10:04:53 2010
From: bdesth.quelquechose at free.quelquepart.fr (Bruno Desthuilliers)
Date: Sat, 06 Mar 2010 16:04:53 +0100
Subject: best practices: is collections.defaultdict my friend or not?
In-Reply-To: <c185da34-716b-4df4-af76-c1214df37f2a@q2g2000pre.googlegroups.com>
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
	<mailman.399.1267842408.23598.python-list@python.org>
	<c185da34-716b-4df4-af76-c1214df37f2a@q2g2000pre.googlegroups.com>
Message-ID: <4b927c8e$0$10093$426a74cc@news.free.fr>

Pete Emerson a ?crit :
(snip)
> I'm really liking the rigid flexibility I'm experiencing with python
> so far.

"rigid flexibility" !-)

+1 QOTW - and welcome on board BTW.


From ijcsorgeditor at gmail.com  Sat Mar  6 10:31:48 2010
From: ijcsorgeditor at gmail.com (editor ijcs)
Date: Sat, 6 Mar 2010 07:31:48 -0800 (PST)
Subject: Call for Paper The International Journal of Computer Science (IJCS)
Message-ID: <50313c59-a5bf-4f12-8c6f-e0c413c68084@k18g2000prf.googlegroups.com>

Call for Paper
The International Journal of Computer Science (IJCS) publishes
original papers on all subjects relevant to computer science,
communication network, and information systems. The highest priority
will be given to those contributions concerned with a discussion of
the background of a practical problem, the establishment of an
appropriate model, the determination of a solution, approximate or
exact, analytical or numerical, and a discussion of the relevance of
the results when applied to the real-life problem. Paper submissions
are invited in the area of computer science, in particular the
technological advances and research results in the fields of
theoretical, experimental, applied electronics, computer science,
communication network and Information technology.
Topics of interest include but are not limited to the following:
     Computer Science

    * Parallel Processing and Distributed Computing
    * Foundations of High-performance Computing
    * Graph Theory and Analysis of Algorithms
    * Artificial Intelligences and Pattern/Image Recognitions
    * Neural Networks and Biomedical Simulations
    * Virtual Visions and Virtual Simulations
    * Data Mining, Web Image Mining and Applications
    * Data Base Management & Information Retrievals Adaptive Systems
    * Bifurcation, Biocybernetics & Bioinformatics
    * Blind Systems, Neural Networks &Control Systems
    * Cryptosystems &Data Compression
    * Evolutional Computation &Fuzzy Systems
    * Image Processing and Image Recognition, Modeling & Optimization
    * Speech Processing, Speech Synthesis & Speech Recognition
    * Video Signal Processing, Watermarking & Wavelet Transform
    * All topics related Computer Science

Communication Network

    * Quantum Computing & Coding
    * Error Controls Agent Computing & Multi-Agents Systems
    * Defining Spectrum Rights and Open Spectrum Solutions
    * Quality of Services and Communication Protocols
    * Satellite and Optical Communication Systems
    * 3G/4G Network Evolutions & CDMA/GSM Communication Protocols
    * Mobile Computing, Transmission/Switching/Distribution
technologies
    * Communication Theory & Signal Processing for Communications
    * Wireless Communications, Wireless & Mobile Networking
    * Optical Networks and Systems &Next-Generation Networking and
Internet
    * Communication QoS &Reliability and Modeling
    * Ad-hoc, Sensor & Mesh Networking
    * Multimedia Services, Communication Software & Services
    * Communication and Information System Security
    * System control and network/service management
    * Network and Internet protocols and standards
    * Client-server, distributed & Web-based communication systems
    * Broadband and multimedia systems & applications
    * Trials of advanced systems and services
    * Any topics related Communication Network

Information and Systems

    * Cryptography and Foundation of Computer Security
    * Authentication/Authorization Issues
    * IDS/Firewall, Anti-Spam mail & Anti-virus issues
    * Biometric authentication & algorithms
    * Fingerprint /Hand/Biometrics Recognitions and Technologies
    * IC-card Security, OTP & Key Management Issues
    * E-commerce, Ubiquitous & RFID Applications
    * Metadata, Meta Modeling, XML & Data Management
    * Knowledge Management, Web Security & Privacy
    * Cyber Threats, Web Services & Web Engineering
    * Web Intelligence, Protocols & Standards
    * Proxies and Servers
    * Multimedia Applications
    * Ontology and the Semantic Web
    * B2B, B2C and C2C
    * E-Business System Design and Development, E-Payment
    * Portal Strategies, Social Networks and Information Systems
    * Social and Legal Issues and Digital Ecology
    * E-Governance, E-Learning and Virtual Classrooms
    * E-Entertainment, E-Journalism
    * Any topics related Information systems

   Electronics

    * Circuits & Devices
    * Communication Networks & Systems
    * Communications & Information Processing
    * Digital Signal Processing & Electrical Engineering
Communications
    * Electromagnetics & Microwaves
    * Instrumentation
    * Measurement & Testing
    * Nanoscience & Nanotechnology
    * Optics & Optoelectronic Effects
    * Devices, Systems &Semiconductors
    * Systems & Control Engineering
    * Telecommunications
    * Any topics related Electronics

International Journal of Computer Science (IJCS)
ISSN: 1884-9083
Website: https://sites.google.com/site/ijcsorg/
Manuscript submission to: ijcsorgeditor at gmail.com

All submitted papers will be judged based on their quality by the
technical committee and reviewers. Papers that describe research and
experimentation are encouraged. All paper submissions will be handled
electronically and detailed instructions on submission procedure are
available on IJCS web pages. Researchers and authors are invited to
participate in the peer-review process of IJCS papers if your research
interest matches with the themes of Call for Papers. For other
information, please contact IJCS Managing Editor.


From jaihindharjun at gmail.com  Sat Mar  6 10:40:19 2010
From: jaihindharjun at gmail.com (karan arjun)
Date: Sat, 6 Mar 2010 07:40:19 -0800 (PST)
Subject: intersting datt with girls.......sign in to this website
Message-ID: <ebfc13d3-8d64-46d4-b590-e5e9bbba0fd3@f8g2000yqn.googlegroups.com>

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From davea at ieee.org  Sat Mar  6 10:56:19 2010
From: davea at ieee.org (Dave Angel)
Date: Sat, 06 Mar 2010 10:56:19 -0500
Subject: compiler with python
In-Reply-To: <d698368f1003060433y2189c120m6f6aa84f2255ba42@mail.gmail.com>
References: <d698368f1003060239g1b4393c5v632b07b833a28df@mail.gmail.com>	
	<4B923E68.1000104@ieee.org>
	<d698368f1003060433y2189c120m6f6aa84f2255ba42@mail.gmail.com>
Message-ID: <4B927B23.2090009@ieee.org>

mohamed issolah wrote:
>
> 2010/3/6 Dave Angel <davea at ieee.org>
>
>   
>> mohamed issolah wrote:
>>
>>     
>>> hey,
>>>
>>> How can I construct a compiler with python just for informatiom ., I have
>>> habit to construct it with C language,
>>>
>>> sorry for my english ;-)
>>>
>>>
>>>       
>> You need to tell us what you're really trying to do, what tools you're
>> willing to use, and probably why you want it.  And if you're not sure about
>> your English, keep the sentence structure straightforward.
>>
>> Let me make a couple of wild guesses:
>>
>>     
>
>
>   
>> You want to design and build a compiler that takes xml information as its
>> source code, and compiles those xml files into Intel x86 machine code.  The
>> compiler and the resulting executable needs to run on an x86 Linux machine.
>>  Your previous experience was in doing this sort of thing in C, but you want
>> to try it with Python instead.  You want to do it without using the lxml
>> libraries.
>>
>> You want to build a python compiler, that takes python source code and
>> produces Java byte code files.  You'd like to do this in C, but don't want
>> to use any of the available existing CPython or Jython source code.  Your
>> goal is not to make a commercially viable product, but to learn as much as
>> possible in the process.
>>
>>
>> DaveA
>>
>>     
>
> hey,
>
> I want to create a compiler which transform a code like pascal code (that
> what I do in C) to "quad"
> In C, I use BISON and FLEX tools.
>
>
>   
I've forwarded your message to the list, and fixed your top-posting by 
moving your response to the bottom.  I don't have a clue what "quad" is, 
unless it's a synonym for Forth.

You haven't specified the OS you'll be using to run the compiler, nor 
the one you're targeting, so some of these choices may not be useful.  
For example, the first one is Linux only.

http://www.freenet.org.nz/python/pybison/
     PyBison - Python binding for Bison/Flex

http://freshmeat.net/projects/yeanpypa/
http://www.slash-me.net/dev/snippets/yeanpypa/documentation.html

http://www.python.org/community/sigs/retired/parser-sig/towards-standard/

Or you could go here, which has links to (most of) these and others.
http://wiki.python.org/moin/LanguageParsing

DaveA







From soniyaa1111 at gmail.com  Sat Mar  6 11:15:22 2010
From: soniyaa1111 at gmail.com (soniyaa 1111)
Date: Sat, 6 Mar 2010 08:15:22 -0800 (PST)
Subject: Shop online without credit card
Message-ID: <b1628c7c-fe25-46d3-bbd0-4137fa021be6@k36g2000prb.googlegroups.com>

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From as at sci.fi  Sat Mar  6 11:24:24 2010
From: as at sci.fi (Anssi Saari)
Date: Sat, 06 Mar 2010 18:24:24 +0200
Subject: Building Python-2.6.4 on G/L: can't build in _ssl support.
References: <hmtdpb$d7q$1@colin2.muc.de>
Message-ID: <vg3fx4dju4n.fsf@pepper.modeemi.cs.tut.fi>

Alan Mackenzie <acm at muc.de> writes:

> Hi, Python!
>
> I build Python-2.6.4 on my GNU/Linux (Debian Sarge) box.  I get a warning
> message "Failed to find the necessary bits to build these modules: ....
> _ssl ...  RTFS to find out what!".

At a guess, you're missing libssl-dev. You might consider installing
python2.6 or python2.6-minimal from unstable or testing too.

> I need _ssl for an application.  So, I look at setup.py in the top
> directory.  It seems that _ssl needs to find certain .h files, but is
> looking in /usr/local/ssl and /usr/contrib (or subdirectories thereof).
> These look like highly non-standard directories.

Looks to me like it looks in those non-standard directories, but in
addition to normal /usr/include.


From peloko45 at gmail.com  Sat Mar  6 13:33:17 2010
From: peloko45 at gmail.com (Joan Miller)
Date: Sat, 6 Mar 2010 10:33:17 -0800 (PST)
Subject: Escape curly bracket together to a variable extension
Message-ID: <09858188-74d3-44be-b66f-1f97bca51500@33g2000yqj.googlegroups.com>

How to escape the first '}' in the next string?

s = "}\n{0}".format('foo')


From alfps at start.no  Sat Mar  6 13:38:23 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Sat, 06 Mar 2010 19:38:23 +0100
Subject: Escape curly bracket together to a variable extension
In-Reply-To: <09858188-74d3-44be-b66f-1f97bca51500@33g2000yqj.googlegroups.com>
References: <09858188-74d3-44be-b66f-1f97bca51500@33g2000yqj.googlegroups.com>
Message-ID: <hmu7f3$9qq$1@news.eternal-september.org>

* Joan Miller:
> How to escape the first '}' in the next string?
> 
> s = "}\n{0}".format('foo')

s = "}}\n{0}".format('foo')


Cheers & hth.,

- Alf


From gherron at islandtraining.com  Sat Mar  6 13:41:44 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Sat, 06 Mar 2010 10:41:44 -0800
Subject: Escape curly bracket together to a variable extension
In-Reply-To: <09858188-74d3-44be-b66f-1f97bca51500@33g2000yqj.googlegroups.com>
References: <09858188-74d3-44be-b66f-1f97bca51500@33g2000yqj.googlegroups.com>
Message-ID: <4B92A1E8.8020407@islandtraining.com>

Joan Miller wrote:
> How to escape the first '}' in the next string?
>
> s = "}\n{0}".format('foo')
>   
 >>> "}}\n{0}".format('foo')
'}\nfoo'


Gary Herron


From helps4indian at gmail.com  Sat Mar  6 15:47:39 2010
From: helps4indian at gmail.com (coolboy8)
Date: Sat, 6 Mar 2010 12:47:39 -0800 (PST)
Subject: Cash for structured settlement
Message-ID: <9a25f256-c9fd-41a2-a0b2-933c42c95d8c@p3g2000pra.googlegroups.com>

Visit Here http://alturl.com/vz8b


From howe.steven at gmail.com  Sat Mar  6 16:13:19 2010
From: howe.steven at gmail.com (Steven Howe)
Date: Sat, 06 Mar 2010 13:13:19 -0800
Subject: compiler with python
In-Reply-To: <4B927B23.2090009@ieee.org>
References: <d698368f1003060239g1b4393c5v632b07b833a28df@mail.gmail.com>		<4B923E68.1000104@ieee.org>	<d698368f1003060433y2189c120m6f6aa84f2255ba42@mail.gmail.com>
	<4B927B23.2090009@ieee.org>
Message-ID: <4B92C56F.60407@gmail.com>

Is it possible he's talking about a 'quad core'? as in a CPU? In that 
case I think he wants
to optimize a python program for a multiprocessor core with four processors.

sph


On 03/06/2010 07:56 AM, Dave Angel wrote:
> mohamed issolah wrote:
>>
>> 2010/3/6 Dave Angel <davea at ieee.org>
>>
>>> mohamed issolah wrote:
>>>
>>>> hey,
>>>>
>>>> How can I construct a compiler with python just for informatiom ., 
>>>> I have
>>>> habit to construct it with C language,
>>>>
>>>> sorry for my english ;-)
>>>>
>>>>
>>> You need to tell us what you're really trying to do, what tools you're
>>> willing to use, and probably why you want it.  And if you're not 
>>> sure about
>>> your English, keep the sentence structure straightforward.
>>>
>>> Let me make a couple of wild guesses:
>>>
>>
>>
>>> You want to design and build a compiler that takes xml information 
>>> as its
>>> source code, and compiles those xml files into Intel x86 machine 
>>> code.  The
>>> compiler and the resulting executable needs to run on an x86 Linux 
>>> machine.
>>>  Your previous experience was in doing this sort of thing in C, but 
>>> you want
>>> to try it with Python instead.  You want to do it without using the 
>>> lxml
>>> libraries.
>>>
>>> You want to build a python compiler, that takes python source code and
>>> produces Java byte code files.  You'd like to do this in C, but 
>>> don't want
>>> to use any of the available existing CPython or Jython source code.  
>>> Your
>>> goal is not to make a commercially viable product, but to learn as 
>>> much as
>>> possible in the process.
>>>
>>>
>>> DaveA
>>>
>>
>> hey,
>>
>> I want to create a compiler which transform a code like pascal code 
>> (that
>> what I do in C) to "quad"
>> In C, I use BISON and FLEX tools.
>>
>>
> I've forwarded your message to the list, and fixed your top-posting by 
> moving your response to the bottom.  I don't have a clue what "quad" 
> is, unless it's a synonym for Forth.
>
> You haven't specified the OS you'll be using to run the compiler, nor 
> the one you're targeting, so some of these choices may not be useful.  
> For example, the first one is Linux only.
>
> http://www.freenet.org.nz/python/pybison/
>     PyBison - Python binding for Bison/Flex
>
> http://freshmeat.net/projects/yeanpypa/
> http://www.slash-me.net/dev/snippets/yeanpypa/documentation.html
>
> http://www.python.org/community/sigs/retired/parser-sig/towards-standard/
>
> Or you could go here, which has links to (most of) these and others.
> http://wiki.python.org/moin/LanguageParsing
>
> DaveA


From alfps at start.no  Sat Mar  6 16:29:04 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Sat, 06 Mar 2010 22:29:04 +0100
Subject: compiler with python
In-Reply-To: <mailman.411.1267910015.23598.python-list@python.org>
References: <d698368f1003060239g1b4393c5v632b07b833a28df@mail.gmail.com>		<4B923E68.1000104@ieee.org>	<d698368f1003060433y2189c120m6f6aa84f2255ba42@mail.gmail.com>	<4B927B23.2090009@ieee.org>
	<mailman.411.1267910015.23598.python-list@python.org>
Message-ID: <hmuhf4$b73$1@news.eternal-september.org>

Since Mohamed is talking about compilation I think it's more likely he's talking 
about an intermediate program represention based on quad tuples like

   (OP, DESTINATION, ARG1, ARG2)

Cheers,

- Alf


* Steven Howe:
> Is it possible he's talking about a 'quad core'? as in a CPU? In that 
> case I think he wants
> to optimize a python program for a multiprocessor core with four 
> processors.
> 
> sph
> 
> 
> On 03/06/2010 07:56 AM, Dave Angel wrote:
>> mohamed issolah wrote:
>>>
>>> 2010/3/6 Dave Angel <davea at ieee.org>
>>>
>>>> mohamed issolah wrote:
>>>>
>>>>> hey,
>>>>>
>>>>> How can I construct a compiler with python just for informatiom ., 
>>>>> I have
>>>>> habit to construct it with C language,
>>>>>
>>>>> sorry for my english ;-)
>>>>>
>>>>>
>>>> You need to tell us what you're really trying to do, what tools you're
>>>> willing to use, and probably why you want it.  And if you're not 
>>>> sure about
>>>> your English, keep the sentence structure straightforward.
>>>>
>>>> Let me make a couple of wild guesses:
>>>>
>>>
>>>
>>>> You want to design and build a compiler that takes xml information 
>>>> as its
>>>> source code, and compiles those xml files into Intel x86 machine 
>>>> code.  The
>>>> compiler and the resulting executable needs to run on an x86 Linux 
>>>> machine.
>>>>  Your previous experience was in doing this sort of thing in C, but 
>>>> you want
>>>> to try it with Python instead.  You want to do it without using the 
>>>> lxml
>>>> libraries.
>>>>
>>>> You want to build a python compiler, that takes python source code and
>>>> produces Java byte code files.  You'd like to do this in C, but 
>>>> don't want
>>>> to use any of the available existing CPython or Jython source code.  
>>>> Your
>>>> goal is not to make a commercially viable product, but to learn as 
>>>> much as
>>>> possible in the process.
>>>>
>>>>
>>>> DaveA
>>>>
>>>
>>> hey,
>>>
>>> I want to create a compiler which transform a code like pascal code 
>>> (that
>>> what I do in C) to "quad"
>>> In C, I use BISON and FLEX tools.
>>>
>>>
>> I've forwarded your message to the list, and fixed your top-posting by 
>> moving your response to the bottom.  I don't have a clue what "quad" 
>> is, unless it's a synonym for Forth.
>>
>> You haven't specified the OS you'll be using to run the compiler, nor 
>> the one you're targeting, so some of these choices may not be useful.  
>> For example, the first one is Linux only.
>>
>> http://www.freenet.org.nz/python/pybison/
>>     PyBison - Python binding for Bison/Flex
>>
>> http://freshmeat.net/projects/yeanpypa/
>> http://www.slash-me.net/dev/snippets/yeanpypa/documentation.html
>>
>> http://www.python.org/community/sigs/retired/parser-sig/towards-standard/
>>
>> Or you could go here, which has links to (most of) these and others.
>> http://wiki.python.org/moin/LanguageParsing
>>
>> DaveA


From isso.moh at gmail.com  Sat Mar  6 17:00:44 2010
From: isso.moh at gmail.com (mohamed issolah)
Date: Sat, 6 Mar 2010 23:00:44 +0100
Subject: compiler with python
Message-ID: <d698368f1003061400n5df8b70bv627a85e5408191aa@mail.gmail.com>

hey, yes quad = quad tuple like ("+",x1,x2,temp)
I work in linux
example : my parser with flex :


-- 
issolah mohamed
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From benjamin at python.org  Sat Mar  6 17:13:46 2010
From: benjamin at python.org (Benjamin Peterson)
Date: Sat, 6 Mar 2010 16:13:46 -0600
Subject: [RELEASED] Python 3.1.2 release candidate
Message-ID: <1afaf6161003061413k646e972eta515d9322793e208@mail.gmail.com>

On behalf of the Python development team, I'm pleased to announce a release
candidate for the second bugfix release of the Python 3.1 series, Python 3.1.2.

This bug fix release fixes numerous issues found in 3.1.1.  This release
candidate has been released to solicit testing and feedback over an possible
regressions from 3.1.1.  Please consider testing it with your library or
application and reporting an bugs you encounter.  This will help make the final
3.1.2 release, planned in 2 weeks time, all the more stable.

The Python 3.1 version series focuses on the stabilization and optimization of
the features and changes that Python 3.0 introduced.  For example, the new I/O
system has been rewritten in C for speed.  File system APIs that use unicode
strings now handle paths with undecodable bytes in them. Other features include
an ordered dictionary implementation, a condensed syntax for nested with
statements, and support for ttk Tile in Tkinter.  For a more extensive list of
changes in 3.1, see http://doc.python.org/3.1/whatsnew/3.1.html or Misc/NEWS in
the Python distribution.

To download Python 3.1.2rc1 visit:

     http://www.python.org/download/releases/3.1.2/

A list of changes in 3.1.2rc1 can be found here:

     http://svn.python.org/projects/python/tags/r312rc1/Misc/NEWS

The 3.1 documentation can be found at:

     http://docs.python.org/3.1

Bugs can always be reported to:

     http://bugs.python.org


Enjoy!

--
Benjamin Peterson
Release Manager
benjamin at python.org
(on behalf of the entire python-dev team and 3.1.2's contributors)


From vinay_sajip at yahoo.co.uk  Sat Mar  6 17:38:57 2010
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Sat, 6 Mar 2010 14:38:57 -0800 (PST)
Subject: Conditional based on whether or not a module is being used
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
	<50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com> 
	<14a5cd5e1003051225j1d596aa2nfe9eb1047037f19d@mail.gmail.com> 
	<mailman.383.1267823696.23598.python-list@python.org>
	<f4de1c96-502a-42e7-b647-ce52d0f76f2f@u15g2000prd.googlegroups.com>
Message-ID: <29c6a957-5028-4c2d-8594-6c4db8243ef2@d2g2000yqa.googlegroups.com>

On Mar 5, 9:29?pm, Pete Emerson <pemer... at gmail.com> wrote:
>
> I have written my first module called "logger" that logs to syslog via
> the syslog module but also allows forloggingto STDOUT in debug mode
> at multiple levels (to increase verbosity depending on one's need), or
> both. I've looked at theloggingmodule and while it might suit my
> needs, it's overkill for me right now (I'm still *very* much a python
> newbie).
>

Overkill in what sense? You just need to write a few lines of code to
be able to use the logging package which comes with Python:

import logging, logging.handlers, sys
logging.basicConfig(level=logging.DEBUG, stream=sys.stdout)
logging.getLogger().addHandler(logging.handlers.SysLogHandler())
# default logs to syslog at (localhost, 514) with facility LOG_USER
# you can change the default to use e.g. Unix domain sockets and a
different facility

So you're experienced enough and have time enough to write your own
logger module, but too much of a newbie to use a module which is part
of Python's included batteries? If you're writing something like
logging to learn about it and what the issues are, that's fair enough.
But I can't see what you mean by overkill, exactly. The three lines
above (or thereabouts) will, I believe, let you log to syslog and to
stdout...which is what you say you want to do.

> I want to write other modules, and my thinking is that it makes sense
> for those modules to use the "logger" module to do thelogging, if and
> only if the parent using the other modules is also using the logger
> module.
>
> In other words, I don't want to force someone to use the "logger"
> module just so they can use my other modules, even if the "logger"
> module is installed ... but I also want to take advantage of it if I'm
> using it.
>
> Now that I've written that, I'm not sure that makes a whole lot of
> sense. It seems like I could say, "hey, this person has the 'logger'
> module available, let's use it!".
>
> Thoughts?

Well, the logging package is available in Python and ready for use and
pretty much battle tested, so why not use that? Are you planning to
use third-party libraries in your Python work, or write everything
yourself? If you are planning to use third party libraries, how would
their logging be hooked into your logger module? And if not, is it
good to have two logging systems in parallel?

Of course as the maintainer of Python's logging package, you'd expect
me to be biased in favour of it. You maybe shouldn't let that sway
you ;-)

Regards,


Vinay Sajip


From benjamin at python.org  Sat Mar  6 17:41:33 2010
From: benjamin at python.org (Benjamin Peterson)
Date: Sat, 6 Mar 2010 16:41:33 -0600
Subject: [RELEASED] Python 2.7 alpha 4
Message-ID: <1afaf6161003061441j5621bbe7jdb8ba4c22f81f46e@mail.gmail.com>

On behalf of the Python development team, I'm overjoyed to announce the fourth
alpha release of Python 2.7.

Python 2.7 is scheduled (by Guido and Python-dev) to be the last major version
in the 2.x series.  Though more major releases have not been absolutely ruled
out, it's likely that the 2.7 release will an extended period of maintenance for
the 2.x series.

2.7 includes many features that were first released in Python 3.1.  The faster
io module, the new nested with statement syntax, improved float repr, set
literals, dictionary views, and the memoryview object have been backported from
3.1. Other features include an ordered dictionary implementation, unittests
improvements, a new sysconfig module, and support for ttk Tile in Tkinter.  For
a more extensive list of changes in 2.7, see
http://doc.python.org/dev/whatsnew/2.7.html or Misc/NEWS in the Python
distribution.

To download Python 2.7 visit:

     http://www.python.org/download/releases/2.7/

Please note that this is a development release, intended as a preview of new
features for the community, and is thus not suitable for production use.

The 2.7 documentation can be found at:

     http://docs.python.org/2.7

Please consider trying Python 2.7 with your code and reporting any bugs you may
notice to:

     http://bugs.python.org


Enjoy!

--
Benjamin Peterson
2.7 Release Manager
benjamin at python.org
(on behalf of the entire python-dev team and 2.7's contributors)


From rantingrick at gmail.com  Sat Mar  6 17:46:29 2010
From: rantingrick at gmail.com (rantingrick)
Date: Sat, 6 Mar 2010 14:46:29 -0800 (PST)
Subject: Sample code usable Tkinter listbox
References: <hmf1qo$v9v$1@news.eternal-september.org>
	<hmmb3d$fij$1@news.eternal-september.org>
Message-ID: <95cc4ed4-20fa-4198-a354-d6734083c2d7@g11g2000yqe.googlegroups.com>

Opps: found a few errors in that last ScrolledListbox class, try this
one...



import Tkinter as tk
from Tkconstants import *

class ScrolledList(tk.Listbox):
    def __init__(self, master, **kw):
        self.frame = tk.Frame(master)
        self.frame.rowconfigure(0, weight=1)
        self.frame.columnconfigure(0, weight=1)
        self.hbar = tk.Scrollbar(self.frame, orient=HORIZONTAL)
        self.block = tk.Frame(self.frame, width=18, height=18)
        self.block.grid(row=1, column=1)
        self.vbar = tk.Scrollbar(self.frame, orient=VERTICAL)
        kw.setdefault('activestyle', 'none')
        kw.setdefault('highlightthickness', 0)
        kw.setdefault('pack', 0)
        if kw.pop('pack') == 1:
            self.frame.pack(fill=BOTH, expand=1)
        tk.Listbox.__init__(self, self.frame, **kw)
        self.grid(row=0, column=0, sticky=N+S+E+W)
        self.hbar.configure(command=self.xview)
        self.vbar.configure(command=self.yview)
        self.config(
            yscrollcommand=self.vbar.set,
            xscrollcommand=self.hbar.set
            )
        self.hbar.grid(row=1, column=0, sticky=W+E)
        self.vbar.grid(row=0, column=1, sticky=N+S)

        self.pack = lambda **kw: self.frame.pack(**kw)
        self.grid = lambda **kw: self.frame.grid(**kw)
        self.place = lambda **kw: self.frame.place(**kw)
        self.pack_config = lambda **kw: self.frame.pack_config(**kw)
        self.grid_config = lambda **kw: self.frame.grid_config(**kw)
        self.place_config = lambda **kw: self.frame.place_config(**kw)
        self.pack_configure = lambda **kw:
self.frame.pack_config(**kw)
        self.grid_configure = lambda **kw:
self.frame.grid_config(**kw)
        self.place_configure = lambda **kw:
self.frame.place_config(**kw)

    def gets(self):
        return self.get(0, END)

    def sets(self, arg):
        self.delete(0, END)
        try:
            arg = arg.strip('\n').splitlines()
        except AttributeError:
            pass
        if hasattr(arg, '__getitem__'):
            for item in arg:
                self.insert(END, str(item))
        else:
            raise TypeError("Scrolledlist.sets() requires a string or
iterable of strings")


if __name__ == '__main__':
    root = tk.Tk()
    listbox = ScrolledList(root, width=50, height=10, pack=1)
    #listbox.sets(1.25)
    #listbox.sets('1\n2\n3\n4\n5\n\n\n')
    listbox.sets(range(100))
    #listbox.grid(row=0, column=0)
    root.mainloop()


From pemerson at gmail.com  Sat Mar  6 18:13:33 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Sat, 6 Mar 2010 15:13:33 -0800 (PST)
Subject: Conditional based on whether or not a module is being used
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
	<50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com> 
	<14a5cd5e1003051225j1d596aa2nfe9eb1047037f19d@mail.gmail.com> 
	<mailman.383.1267823696.23598.python-list@python.org>
	<f4de1c96-502a-42e7-b647-ce52d0f76f2f@u15g2000prd.googlegroups.com>
	<29c6a957-5028-4c2d-8594-6c4db8243ef2@d2g2000yqa.googlegroups.com>
Message-ID: <9c6a8d26-b71e-4cb8-92d0-49af8728bec4@u15g2000prd.googlegroups.com>

On Mar 6, 2:38?pm, Vinay Sajip <vinay_sa... at yahoo.co.uk> wrote:
> On Mar 5, 9:29?pm, Pete Emerson <pemer... at gmail.com> wrote:
>
>
>
> > I have written my first module called "logger" that logs to syslog via
> > the syslog module but also allows forloggingto STDOUT in debug mode
> > at multiple levels (to increase verbosity depending on one's need), or
> > both. I've looked at theloggingmodule and while it might suit my
> > needs, it's overkill for me right now (I'm still *very* much a python
> > newbie).
>
> Overkill in what sense? You just need to write a few lines of code to
> be able to use the logging package which comes with Python:
>
> import logging, logging.handlers, sys
> logging.basicConfig(level=logging.DEBUG, stream=sys.stdout)
> logging.getLogger().addHandler(logging.handlers.SysLogHandler())
> # default logs to syslog at (localhost, 514) with facility LOG_USER
> # you can change the default to use e.g. Unix domain sockets and a
> different facility
>
> So you're experienced enough and have time enough to write your own
> logger module, but too much of a newbie to use a module which is part
> of Python's included batteries? If you're writing something like
> logging to learn about it and what the issues are, that's fair enough.
> But I can't see what you mean by overkill, exactly. The three lines
> above (or thereabouts) will, I believe, let you log to syslog and to
> stdout...which is what you say you want to do.
>
> > I want to write other modules, and my thinking is that it makes sense
> > for those modules to use the "logger" module to do thelogging, if and
> > only if the parent using the other modules is also using the logger
> > module.
>
> > In other words, I don't want to force someone to use the "logger"
> > module just so they can use my other modules, even if the "logger"
> > module is installed ... but I also want to take advantage of it if I'm
> > using it.
>
> > Now that I've written that, I'm not sure that makes a whole lot of
> > sense. It seems like I could say, "hey, this person has the 'logger'
> > module available, let's use it!".
>
> > Thoughts?
>
> Well, the logging package is available in Python and ready for use and
> pretty much battle tested, so why not use that? Are you planning to
> use third-party libraries in your Python work, or write everything
> yourself? If you are planning to use third party libraries, how would
> their logging be hooked into your logger module? And if not, is it
> good to have two logging systems in parallel?
>
> Of course as the maintainer of Python's logging package, you'd expect
> me to be biased in favour of it. You maybe shouldn't let that sway
> you ;-)
>
> Regards,
>
> Vinay Sajip

Thanks for your insights, Vinay, and thank you also for writing
packages such as logging. The word 'overkill' was a poor choice on my
part! I should have said, "I don't quite understand the logging module
yet, but I am comfortable with the syslog module's two functions,
openlog and syslog".

I wrote my own logger module *partly* to gain the experience, and
partly to do the following:

1) In debug mode, send what would have gone to syslog to STDOUT or
STDERR
2) In non-debug mode, use /dev/log or localhost:514 depending on what
is set
3) Allow for multiple levels of logging beyond INFO, WARNING, CRIT ...
essentially allow multiple levels of INFO depending on how much detail
is desired.  A high level of messaging when programs are running
poorly is desired, but when programs are running smoothly, I don't
need to send as much to syslog.

I started in with your logging package, but I think I simply got ahead
of myself. I definitely agree that writing my own wrappers around
syslog to do what I want might be a duplication of effort. At this
point I think I'm ready to go back to your logging package and see
what I can do; if you have words of advice regarding 1-3 above, I'd
certainly appreciate it.

Now I'll go to your example above and see what it does. Thank you!

Pete


From igouy2 at yahoo.com  Sat Mar  6 18:53:25 2010
From: igouy2 at yahoo.com (Isaac Gouy)
Date: Sat, 6 Mar 2010 15:53:25 -0800 (PST)
Subject: python b.python 8 works on XP but not on Vista?
Message-ID: <e91cc254-0954-4260-8a4a-48e725a6bd87@k6g2000prg.googlegroups.com>

At the command prompt:

   python b.py 8
works fine on both XP and Vista

   python b.python 8
works on XP (and Linux)

but on Vista

   python b.python 8

ImportError: No module named b

?


From news123 at free.fr  Sat Mar  6 18:53:39 2010
From: news123 at free.fr (News123)
Date: Sun, 07 Mar 2010 00:53:39 +0100
Subject: async notification handling w/o threads/polling (similiar to kill
	-hup)?
Message-ID: <4b92eb03$0$22022$426a74cc@news.free.fr>

Hi,

I'd like to notify python processes asynchronously.
at notification time a callback should be called

The solution should be working on linux and Windows.

I could add a wrapper to switch between a windows / linux implementation
though

If possible I'd like to avoid
- having to poll for an external event
- having to add a thread.
- changing my existing code

I thought about using   signal and os.kill()
However windows does not to have SIGHUP , SIGUSR1 or SIGUSR2.
So I'm not sure, which signal I could use with windows.


Apart from that there's one minor problem with signals
which might speak against using signal
All blocking io calls might be interrupted, which is not desirable in my
case.

Do you have any suggestions for
Linux / WIndows or both?


#### example code with signals #################
#### a blocking io call here reading a named pipe
#### would be interrupted
import signal
a = 0
def handler(signum,frame):
    global a
    a += 1

signal.signal(signal.SIGUSR1,handler)
print "hi"
p = open("namedpipe")
while True:
    v = p.read(2)
    print "V:",a,len(v)
    if len(v) != 2: break

print "var a changed, but read() was interrupted :-("


bye


N


From clp2 at rebertia.com  Sat Mar  6 19:02:43 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 6 Mar 2010 16:02:43 -0800
Subject: python b.python 8 works on XP but not on Vista?
In-Reply-To: <e91cc254-0954-4260-8a4a-48e725a6bd87@k6g2000prg.googlegroups.com>
References: <e91cc254-0954-4260-8a4a-48e725a6bd87@k6g2000prg.googlegroups.com>
Message-ID: <50697b2c1003061602y31e26526q878f0c5a9e5573c5@mail.gmail.com>

On Sat, Mar 6, 2010 at 3:53 PM, Isaac Gouy <igouy2 at yahoo.com> wrote:
> At the command prompt:
>
> ? python b.py 8
> works fine on both XP and Vista
>
> ? python b.python 8
> works on XP (and Linux)
>
> but on Vista
>
> ? python b.python 8
>
> ImportError: No module named b
>
> ?

Code please. Also, .python is not a standard extension for Python
files, so why are you using it anyway?

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


From news123 at free.fr  Sat Mar  6 19:17:25 2010
From: news123 at free.fr (News123)
Date: Sun, 07 Mar 2010 01:17:25 +0100
Subject: async notification handling w/o threads/polling (similiar to
	kill -hup)?
In-Reply-To: <4b92eb03$0$22022$426a74cc@news.free.fr>
References: <4b92eb03$0$22022$426a74cc@news.free.fr>
Message-ID: <4b92f095$0$20648$426a74cc@news.free.fr>

News123 wrote:
> Hi,
> 
> I'd like to notify python processes asynchronously.
> at notification time a callback should be called
> 
> The solution should be working on linux and Windows.
> 
> I could add a wrapper to switch between a windows / linux implementation
> though
> 
> If possible I'd like to avoid
> - having to poll for an external event
> - having to add a thread.
Well having a blocking thread would be fine though. what I'd really want
to avoid is any polling.
> - changing my existing code
> 
> I thought about using   signal and os.kill()
> However windows does not to have SIGHUP , SIGUSR1 or SIGUSR2.
> So I'm not sure, which signal I could use with windows.
> 
> 
> Apart from that there's one minor problem with signals
> which might speak against using signal
> All blocking io calls might be interrupted, which is not desirable in my
> case.
> 
> Do you have any suggestions for
> Linux / WIndows or both?
> 
> 
> #### example code with signals #################
> #### a blocking io call here reading a named pipe
> #### would be interrupted
> import signal
> a = 0
> def handler(signum,frame):
>     global a
>     a += 1
> 
> signal.signal(signal.SIGUSR1,handler)
> print "hi"
> p = open("namedpipe")
> while True:
>     v = p.read(2)
>     print "V:",a,len(v)
>     if len(v) != 2: break
> 
> print "var a changed, but read() was interrupted :-("
> 
> 
> bye
> 
> 
> N


From igouy2 at yahoo.com  Sat Mar  6 19:42:42 2010
From: igouy2 at yahoo.com (Isaac Gouy)
Date: Sat, 6 Mar 2010 16:42:42 -0800 (PST)
Subject: python b.python 8 works on XP but not on Vista?
References: <e91cc254-0954-4260-8a4a-48e725a6bd87@k6g2000prg.googlegroups.com>
	<mailman.415.1267920166.23598.python-list@python.org>
Message-ID: <5e6d069d-9116-4a53-914e-594b656c4269@q2g2000pre.googlegroups.com>

On Mar 6, 4:02?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Sat, Mar 6, 2010 at 3:53 PM, Isaac Gouy <igo... at yahoo.com> wrote:
> > At the command prompt:
>
> > ? python b.py 8
> > works fine on both XP and Vista
>
> > ? python b.python 8
> > works on XP (and Linux)
>
> > but on Vista
>
> > ? python b.python 8
>
> > ImportError: No module named b
>
> > ?
>
> Code please.


It's the same code in both cases, I simply renamed "b.python" as
"b.py" as a test.


> Also, .python is not a standard extension for Python
> files, so why are you using it anyway?

Because it's useful for what I'm doing.

Given python 2.6.4 has no problem with a non-standard extension on MS
XP and Linux - why does python 2.6.4 have this problem with a non-
standard extension on MS Vista?




From timr at probo.com  Sat Mar  6 19:49:33 2010
From: timr at probo.com (Tim Roberts)
Date: Sat, 06 Mar 2010 16:49:33 -0800
Subject: indentation error
References: <f1e05b1f-3812-490a-9e6d-4a83aef7fe1d@q2g2000pre.googlegroups.com>
Message-ID: <e0u5p51rcme3igu2882upg7qof8e5l30bm@4ax.com>

asit <lipun4u at gmail.com> wrote:
>
>According to me, indentation is ok. but the python interpreter gives
>an indentation error
>
>[asit ~/py] $ python search.py
>  File "search.py", line 7
>    findResults = string.split(commandOutput, "\n")
>                                                  ^
>IndentationError: unindent does not match any outer indentation level

The most likely cause is mixing spaces with tabs.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From clp2 at rebertia.com  Sat Mar  6 19:53:30 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 6 Mar 2010 16:53:30 -0800
Subject: python b.python 8 works on XP but not on Vista?
In-Reply-To: <5e6d069d-9116-4a53-914e-594b656c4269@q2g2000pre.googlegroups.com>
References: <e91cc254-0954-4260-8a4a-48e725a6bd87@k6g2000prg.googlegroups.com>
	<mailman.415.1267920166.23598.python-list@python.org>
	<5e6d069d-9116-4a53-914e-594b656c4269@q2g2000pre.googlegroups.com>
Message-ID: <50697b2c1003061653g14a3584if8358500149a2715@mail.gmail.com>

On Sat, Mar 6, 2010 at 4:42 PM, Isaac Gouy <igouy2 at yahoo.com> wrote:
> On Mar 6, 4:02?pm, Chris Rebert <c... at rebertia.com> wrote:
>> On Sat, Mar 6, 2010 at 3:53 PM, Isaac Gouy <igo... at yahoo.com> wrote:
>> > At the command prompt:
>>
>> > ? python b.py 8
>> > works fine on both XP and Vista
>>
>> > ? python b.python 8
>> > works on XP (and Linux)
>>
>> > but on Vista
>>
>> > ? python b.python 8
>>
>> > ImportError: No module named b
>>
>> > ?
>>
>> Code please.
>
>
> It's the same code in both cases, I simply renamed "b.python" as
> "b.py" as a test.

The code in b.py matters. I /suspect/ it's importing itself somehow
(probably indirectly), and Python doesn't look for ".python" files
when importing, so it fails with an ImportError. But since you haven't
shown the code, I can only guess.

For that matter, the full exception Traceback would be more helpful
than the code; please include it as well.

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


From igouy2 at yahoo.com  Sat Mar  6 20:23:37 2010
From: igouy2 at yahoo.com (Isaac Gouy)
Date: Sat, 6 Mar 2010 17:23:37 -0800 (PST)
Subject: python b.python 8 works on XP but not on Vista?
References: <e91cc254-0954-4260-8a4a-48e725a6bd87@k6g2000prg.googlegroups.com>
	<mailman.415.1267920166.23598.python-list@python.org>
	<5e6d069d-9116-4a53-914e-594b656c4269@q2g2000pre.googlegroups.com>
	<mailman.416.1267923213.23598.python-list@python.org>
Message-ID: <226a6de2-4626-4a5d-9653-6211284c9ce4@t31g2000prh.googlegroups.com>

On Mar 6, 4:53?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Sat, Mar 6, 2010 at 4:42 PM, Isaac Gouy <igo... at yahoo.com> wrote:
> > On Mar 6, 4:02?pm, Chris Rebert <c... at rebertia.com> wrote:
> >> On Sat, Mar 6, 2010 at 3:53 PM, Isaac Gouy <igo... at yahoo.com> wrote:
> >> > At the command prompt:
>
> >> > ? python b.py 8
> >> > works fine on both XP and Vista
>
> >> > ? python b.python 8
> >> > works on XP (and Linux)
>
> >> > but on Vista
>
> >> > ? python b.python 8
>
> >> > ImportError: No module named b
>
> >> > ?
>
> >> Code please.
>
> > It's the same code in both cases, I simply renamed "b.python" as
> > "b.py" as a test.
>
> The code in b.py matters. I /suspect/ it's importing itself somehow
> (probably indirectly), and Python doesn't look for ".python" files
> when importing, so it fails with an ImportError. But since you haven't
> shown the code, I can only guess.

Yes the code in b.py matters.

Why it matters is that there was another difference between XP and
Vista - the XP machine was single core but the Vista machine was multi
core - and the code behaves differently in each case.

Thanks.



From ssteinerx at gmail.com  Sat Mar  6 21:10:02 2010
From: ssteinerx at gmail.com (ssteinerX@gmail.com)
Date: Sat, 6 Mar 2010 21:10:02 -0500
Subject: python b.python 8 works on XP but not on Vista?
In-Reply-To: <226a6de2-4626-4a5d-9653-6211284c9ce4@t31g2000prh.googlegroups.com>
References: <e91cc254-0954-4260-8a4a-48e725a6bd87@k6g2000prg.googlegroups.com>
	<mailman.415.1267920166.23598.python-list@python.org>
	<5e6d069d-9116-4a53-914e-594b656c4269@q2g2000pre.googlegroups.com>
	<mailman.416.1267923213.23598.python-list@python.org>
	<226a6de2-4626-4a5d-9653-6211284c9ce4@t31g2000prh.googlegroups.com>
Message-ID: <CC4C2ADA-3100-4DAE-8234-028FD9D7116E@gmail.com>


On Mar 6, 2010, at 8:23 PM, Isaac Gouy wrote:

> On Mar 6, 4:53 pm, Chris Rebert <c... at rebertia.com> wrote:
>> On Sat, Mar 6, 2010 at 4:42 PM, Isaac Gouy <igo... at yahoo.com> wrote:
>>> On Mar 6, 4:02 pm, Chris Rebert <c... at rebertia.com> wrote:
>>>> On Sat, Mar 6, 2010 at 3:53 PM, Isaac Gouy <igo... at yahoo.com> wrote:
>>>>> At the command prompt:
>> 
>>>>>   python b.py 8
>>>>> works fine on both XP and Vista
>> 
>>>>>   python b.python 8
>>>>> works on XP (and Linux)
>> 
>>>>> but on Vista
>> 
>>>>>   python b.python 8
>> 
>>>>> ImportError: No module named b
>> 
>>>>> ?
>> 
>>>> Code please.
>> 
>>> It's the same code in both cases, I simply renamed "b.python" as
>>> "b.py" as a test.
>> 
>> The code in b.py matters. I /suspect/ it's importing itself somehow
>> (probably indirectly), and Python doesn't look for ".python" files
>> when importing, so it fails with an ImportError. But since you haven't
>> shown the code, I can only guess.
> 
> Yes the code in b.py matters.
> 
> Why it matters is that there was another difference between XP and
> Vista - the XP machine was single core but the Vista machine was multi
> core - and the code behaves differently in each case.

Yes, and the XP machine's case was blue, therefore case color is important, too.

S



From steve at REMOVE-THIS-cybersource.com.au  Sat Mar  6 21:50:02 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 07 Mar 2010 02:50:02 GMT
Subject: python b.python 8 works on XP but not on Vista?
References: <e91cc254-0954-4260-8a4a-48e725a6bd87@k6g2000prg.googlegroups.com>
	<mailman.415.1267920166.23598.python-list@python.org>
	<5e6d069d-9116-4a53-914e-594b656c4269@q2g2000pre.googlegroups.com>
	<mailman.416.1267923213.23598.python-list@python.org>
	<226a6de2-4626-4a5d-9653-6211284c9ce4@t31g2000prh.googlegroups.com>
	<mailman.420.1267927808.23598.python-list@python.org>
Message-ID: <4b93145a$0$8816$c3e8da3@news.astraweb.com>

On Sat, 06 Mar 2010 21:10:02 -0500, ssteinerX at gmail.com wrote:

> On Mar 6, 2010, at 8:23 PM, Isaac Gouy wrote:
> 
>> On Mar 6, 4:53 pm, Chris Rebert <c... at rebertia.com> wrote:
>>> On Sat, Mar 6, 2010 at 4:42 PM, Isaac Gouy <igo... at yahoo.com> wrote:
>>>> On Mar 6, 4:02 pm, Chris Rebert <c... at rebertia.com> wrote:
>>>>> On Sat, Mar 6, 2010 at 3:53 PM, Isaac Gouy <igo... at yahoo.com> wrote:
>>>>>> At the command prompt:
>>> 
>>>>>>   python b.py 8
>>>>>> works fine on both XP and Vista
>>> 
>>>>>>   python b.python 8
>>>>>> works on XP (and Linux)
>>> 
>>>>>> but on Vista
>>> 
>>>>>>   python b.python 8
>>> 
>>>>>> ImportError: No module named b
>>> 
>>>>>> ?
>>> 
>>>>> Code please.
>>> 
>>>> It's the same code in both cases, I simply renamed "b.python" as
>>>> "b.py" as a test.
>>> 
>>> The code in b.py matters. I /suspect/ it's importing itself somehow
>>> (probably indirectly), and Python doesn't look for ".python" files
>>> when importing, so it fails with an ImportError. But since you haven't
>>> shown the code, I can only guess.
>> 
>> Yes the code in b.py matters.
>> 
>> Why it matters is that there was another difference between XP and
>> Vista - the XP machine was single core but the Vista machine was multi
>> core - and the code behaves differently in each case.
> 
> Yes, and the XP machine's case was blue, therefore case color is
> important, too.


Don't forget that the XP machine was on the left hand side of the desk, 
and the Vista machine on the right. I suspect Isaac needs to physically 
move the Vista machine to the left side, and it will work perfectly.

Either that, or stop pissing around and show us the actual stack trace so 
we can actually help. Isaac, stop *guessing* what the problem is.

If you have to guess, try to make your guesses realistic. It's not likely 
anything to do with the CPU. If anything, Python's search path is 
different on your Vista and XP machines.




-- 
Steven


From igouy2 at yahoo.com  Sat Mar  6 22:04:56 2010
From: igouy2 at yahoo.com (Isaac Gouy)
Date: Sat, 6 Mar 2010 19:04:56 -0800 (PST)
Subject: python b.python 8 works on XP but not on Vista?
References: <e91cc254-0954-4260-8a4a-48e725a6bd87@k6g2000prg.googlegroups.com>
	<mailman.415.1267920166.23598.python-list@python.org>
	<5e6d069d-9116-4a53-914e-594b656c4269@q2g2000pre.googlegroups.com>
	<mailman.416.1267923213.23598.python-list@python.org>
	<226a6de2-4626-4a5d-9653-6211284c9ce4@t31g2000prh.googlegroups.com>
	<mailman.420.1267927808.23598.python-list@python.org>
	<4b93145a$0$8816$c3e8da3@news.astraweb.com>
Message-ID: <fe396e14-298b-4629-9a05-657ab9321714@p3g2000pra.googlegroups.com>

On Mar 6, 6:50?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Sat, 06 Mar 2010 21:10:02 -0500, sstein... at gmail.com wrote:
> > On Mar 6, 2010, at 8:23 PM, Isaac Gouy wrote:
>
> >> On Mar 6, 4:53 pm, Chris Rebert <c... at rebertia.com> wrote:
> >>> On Sat, Mar 6, 2010 at 4:42 PM, Isaac Gouy <igo... at yahoo.com> wrote:
> >>>> On Mar 6, 4:02 pm, Chris Rebert <c... at rebertia.com> wrote:
> >>>>> On Sat, Mar 6, 2010 at 3:53 PM, Isaac Gouy <igo... at yahoo.com> wrote:
> >>>>>> At the command prompt:
>
> >>>>>> ? python b.py 8
> >>>>>> works fine on both XP and Vista
>
> >>>>>> ? python b.python 8
> >>>>>> works on XP (and Linux)
>
> >>>>>> but on Vista
>
> >>>>>> ? python b.python 8
>
> >>>>>> ImportError: No module named b
>
> >>>>>> ?
>
> >>>>> Code please.
>
> >>>> It's the same code in both cases, I simply renamed "b.python" as
> >>>> "b.py" as a test.
>
> >>> The code in b.py matters. I /suspect/ it's importing itself somehow
> >>> (probably indirectly), and Python doesn't look for ".python" files
> >>> when importing, so it fails with an ImportError. But since you haven't
> >>> shown the code, I can only guess.
>
> >> Yes the code in b.py matters.
>
> >> Why it matters is that there was another difference between XP and
> >> Vista - the XP machine was single core but the Vista machine was multi
> >> core - and the code behaves differently in each case.
>
> > Yes, and the XP machine's case was blue, therefore case color is
> > important, too.
>
> Don't forget that the XP machine was on the left hand side of the desk,
> and the Vista machine on the right. I suspect Isaac needs to physically
> move the Vista machine to the left side, and it will work perfectly.
>
> Either that, or stop pissing around and show us the actual stack trace so
> we can actually help. Isaac, stop *guessing* what the problem is.
>
> If you have to guess, try to make your guesses realistic. It's not likely
> anything to do with the CPU. If anything, Python's search path is
> different on your Vista and XP machines.
>
> --
> Steven


That was "Thanks." as in problem solved.

When the code switches on multiprocessing.cpu_count() - single core vs
multicore matters.


From sumerc at gmail.com  Sat Mar  6 22:51:38 2010
From: sumerc at gmail.com (k3xji)
Date: Sat, 6 Mar 2010 19:51:38 -0800 (PST)
Subject: yappi v0.42 released
Message-ID: <4795dfc3-e852-4466-bfe6-c39ef4a900ce@q15g2000yqj.googlegroups.com>

Hi all,

yappi(yet another python profiler with multithreading support)
released.

See:
http://code.google.com/p/yappi/

Thanks,


From steve at REMOVE-THIS-cybersource.com.au  Sat Mar  6 23:23:13 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 07 Mar 2010 04:23:13 GMT
Subject: python b.python 8 works on XP but not on Vista?
References: <e91cc254-0954-4260-8a4a-48e725a6bd87@k6g2000prg.googlegroups.com>
	<mailman.415.1267920166.23598.python-list@python.org>
	<5e6d069d-9116-4a53-914e-594b656c4269@q2g2000pre.googlegroups.com>
	<mailman.416.1267923213.23598.python-list@python.org>
	<226a6de2-4626-4a5d-9653-6211284c9ce4@t31g2000prh.googlegroups.com>
	<mailman.420.1267927808.23598.python-list@python.org>
	<4b93145a$0$8816$c3e8da3@news.astraweb.com>
	<fe396e14-298b-4629-9a05-657ab9321714@p3g2000pra.googlegroups.com>
Message-ID: <4b932a30$0$8816$c3e8da3@news.astraweb.com>

On Sat, 06 Mar 2010 19:04:56 -0800, Isaac Gouy wrote:

> That was "Thanks." as in problem solved.
> 
> When the code switches on multiprocessing.cpu_count() - single core vs
> multicore matters.

I'm glad you solved your problem. Out of curiosity, what was the fault? 
Not the condition that leads to the fault, but the actual fault?

My guess is that it was a difference in sys.path, leading to the b module 
not being found. Am I close?


-- 
Steven


From ping.nsr.yeh at gmail.com  Sun Mar  7 01:53:40 2010
From: ping.nsr.yeh at gmail.com (Ping)
Date: Sat, 6 Mar 2010 22:53:40 -0800 (PST)
Subject: Asynchronous HTTP client
Message-ID: <b212d954-6eb0-43d3-80ac-6cd854a1a560@b36g2000pri.googlegroups.com>

Hi,

I'm trying to find a way to create an asynchronous HTTP client so I
can get responses from web servers in a way like

  async_http_open('http://example.com/', callback_func)
  # immediately continues, and callback_func is called with response
as arg when it is ready

It seems twisted can do it, but I hesitate to bring in such a big
package as a dependency because my client should be light. Asyncore
and asynchat are lighter but they don't speak HTTP. The asynchttp
project on sourceforge is a fusion between asynchat and httplib, but
it hasn't been updated since 2001 and is seriously out of sync with
httplib.

I'd appreciate it if anyone can shed some lights on this.

Thanks,
Ping


From breamoreboy at yahoo.co.uk  Sun Mar  7 04:33:22 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Sun, 07 Mar 2010 09:33:22 +0000
Subject: best practices: is collections.defaultdict my friend or not?
In-Reply-To: <3ae40c74-7bee-4c6c-9ed2-7a73675f8040@v20g2000prb.googlegroups.com>
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>	<20100306031003.1018aab2@geekmail.INVALID>
	<3ae40c74-7bee-4c6c-9ed2-7a73675f8040@v20g2000prb.googlegroups.com>
Message-ID: <hmvrri$drn$1@dough.gmane.org>

Pete Emerson wrote:
> On Mar 5, 6:10 pm, Andreas Waldenburger <use... at geekmail.INVALID>
> wrote:
>> On Fri, 5 Mar 2010 17:22:14 -0800 (PST) Pete Emerson
>>
>>
>>
>>
>>
>> <pemer... at gmail.com> wrote:
>>> [snip]
>>>>>> data['one'] = {}
>>>>>> data['one']['two'] = 'three'
>>>>>> print data
>>> {'one': {'two': 'three'}}
>>> And through some research, I discovered collections.defaultdict (new
>>> in Python 2.5, FWIW):
>>>>>> import collections
>>>>>> data = collections.defaultdict(dict)
>>>>>> data['one']['two'] = 'three'
>>>>>> print data
>>> defaultdict(<type 'dict'>, {'one': {'two': 'three'}})
>>> [snip]
>>> Your thoughts and comments are very much appreciated. I think my brain
>>> already knows some of the answers, but my heart ... well, perl and I
>>> go way back. Loving python so far, though.
>> Oh, by the way: That defaultdict route is a pretty solid solution. Not
>> sure what problem you're trying to solve -- depending on your usecase,
>> there might be a better approach.
>>
>> If you're just asking hypothetically and you're trying to apply a
>> Perl idiom to Python, there probably *is* a better solution.
>>
>> /W
>>
>> --
>> INVALID? DE!
> 
> I found out about the need to declare the higher level as I was
> reading in a JSON struct into a dict and then adding a new entry at a
> lower level. Mostly just proof of concept stuff as I'm learning
> python. I'm not sure that the use of defaultdict is really warranted
> for me anywhere just yet. Mostly, I don't want to convert my perl to
> python, that seems very counterproductive. Thank you very much for
> your insight.
> 
> I was a little frightened of doing "import this" ("Hey, kid, run rm -
> rf / and see what happens!"), but did, and the words are wise. :)
> 
> Pete

After reading the words of wisdom try "import this" a second time and 
watch what happens, it's quite interesting if you're not expecting the 
output.

Mark Lawrence.



From contact at xavierho.com  Sun Mar  7 04:59:00 2010
From: contact at xavierho.com (Xavier Ho)
Date: Sun, 7 Mar 2010 19:59:00 +1000
Subject: Curiosity stirkes me on 'import this'.
Message-ID: <2d56febf1003070159o5346701ema0ba72a43066ace2@mail.gmail.com>

I took a look at the 'this' module to see where the file is stored. This is
probably old news to some people, but was new to me.

print this.s
Gur Mra bs Clguba, ol Gvz Crgref

Ornhgvshy vf orggre guna htyl.
Rkcyvpvg vf orggre guna vzcyvpvg.
Fvzcyr vf orggre guna pbzcyrk.
Pbzcyrk vf orggre guna pbzcyvpngrq.
Syng vf orggre guna arfgrq.
Fcnefr vf orggre guna qrafr.
Ernqnovyvgl pbhagf.
Fcrpvny pnfrf nera'g fcrpvny rabhtu gb oernx gur ehyrf.
Nygubhtu cenpgvpnyvgl orngf chevgl.
Reebef fubhyq arire cnff fvyragyl.
Hayrff rkcyvpvgyl fvyraprq.
Va gur snpr bs nzovthvgl, ershfr gur grzcgngvba gb thrff.
Gurer fubhyq or bar-- naq cersrenoyl bayl bar --boivbhf jnl gb qb vg.
Nygubhtu gung jnl znl abg or boivbhf ng svefg hayrff lbh'er Qhgpu.
Abj vf orggre guna arire.
Nygubhtu arire vf bsgra orggre guna *evtug* abj.
Vs gur vzcyrzragngvba vf uneq gb rkcynva, vg'f n onq vqrn.
Vs gur vzcyrzragngvba vf rnfl gb rkcynva, vg znl or n tbbq vqrn.
Anzrfcnprf ner bar ubaxvat terng vqrn -- yrg'f qb zber bs gubfr!

And some other attributes in 'this' module as well, that decodes the string.
I'm curious. Was this encoded purely for fun? *grins*

Cheers,

Ching-Yun Xavier Ho, Technical Artist

Contact Information
Mobile: (+61) 04 3335 4748
Skype ID: SpaXe85
Email: contact at xavierho.com
Website: http://xavierho.com/
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From peloko45 at gmail.com  Sun Mar  7 05:32:28 2010
From: peloko45 at gmail.com (Joan Miller)
Date: Sun, 7 Mar 2010 02:32:28 -0800 (PST)
Subject: Problem with regular expression
Message-ID: <2dd22712-057a-42a7-9f21-349a56094339@c16g2000yqd.googlegroups.com>

I would to convert the first string to upper case. But this regular
expression is not matching the first string between quotes.

  re.sub("'(?P<id>\w+)': [^{]", "\g<id>FOO", str)

# string to non-matching
'foo': {

# strings to matching
'bar': 'bar2'
'bar': None
'bar': 0
'bar': True

So, i.e., from the first string I would to get:
  'BAR': 'bar2'


Any help? please
Thanks in advance


From steve at holdenweb.com  Sun Mar  7 07:34:41 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 07 Mar 2010 07:34:41 -0500
Subject: Conditional based on whether or not a module is being used
In-Reply-To: <29c6a957-5028-4c2d-8594-6c4db8243ef2@d2g2000yqa.googlegroups.com>
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>	<50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com>
	<14a5cd5e1003051225j1d596aa2nfe9eb1047037f19d@mail.gmail.com>
	<mailman.383.1267823696.23598.python-list@python.org>	<f4de1c96-502a-42e7-b647-ce52d0f76f2f@u15g2000prd.googlegroups.com>
	<29c6a957-5028-4c2d-8594-6c4db8243ef2@d2g2000yqa.googlegroups.com>
Message-ID: <hn06i2$i6q$1@dough.gmane.org>

Vinay Sajip wrote:
[...]
> Well, the logging package is available in Python and ready for use and
> pretty much battle tested, so why not use that? Are you planning to
> use third-party libraries in your Python work, or write everything
> yourself? If you are planning to use third party libraries, how would
> their logging be hooked into your logger module? And if not, is it
> good to have two logging systems in parallel?
> 
> Of course as the maintainer of Python's logging package, you'd expect
> me to be biased in favour of it. You maybe shouldn't let that sway
> you ;-)
> 
Vinay:

My own impression of the logging module, formed from trying to use its
documentation in the past, is that it's somewhat unapproachable, and
difficult to use for simple purposes.

I am happy to say that now I see the current (3.1) documentation it has
improved to the point where I would be happy to try using it again.
Thanks for your long-term maintenance of this package.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From news123 at free.fr  Sun Mar  7 07:52:13 2010
From: news123 at free.fr (News123)
Date: Sun, 07 Mar 2010 13:52:13 +0100
Subject: Problem with regular expression
In-Reply-To: <2dd22712-057a-42a7-9f21-349a56094339@c16g2000yqd.googlegroups.com>
References: <2dd22712-057a-42a7-9f21-349a56094339@c16g2000yqd.googlegroups.com>
Message-ID: <4b93a17d$0$22009$426a74cc@news.free.fr>

Hi Joan,



Joan Miller wrote:
> I would to convert the first string to upper case. But this regular
> expression is not matching the first string between quotes.
> 
>   re.sub("'(?P<id>\w+)': [^{]", "\g<id>FOO", str)
> 
> # string to non-matching
> 'foo': {
> 
> # strings to matching
> 'bar': 'bar2'
> 'bar': None
> 'bar': 0
> 'bar': True
> 
> So, i.e., from the first string I would to get:
>   'BAR': 'bar2'
> 
I'm a little slow today and don't exactly understand your question.

Could you perhaps add some examples of input lines and what you would
like to extract?

example:
input = "first word to Upper"
output = "FIRST word to Upper"


bye


N

> 
> Any help? please
> Thanks in advance


From steve at holdenweb.com  Sun Mar  7 08:03:08 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 07 Mar 2010 08:03:08 -0500
Subject: Problem with regular expression
In-Reply-To: <2dd22712-057a-42a7-9f21-349a56094339@c16g2000yqd.googlegroups.com>
References: <2dd22712-057a-42a7-9f21-349a56094339@c16g2000yqd.googlegroups.com>
Message-ID: <hn087d$sks$1@dough.gmane.org>

Joan Miller wrote:
> I would to convert the first string to upper case. But this regular
> expression is not matching the first string between quotes.
> 
>   re.sub("'(?P<id>\w+)': [^{]", "\g<id>FOO", str)
> 
> # string to non-matching
> 'foo': {
> 
> # strings to matching
> 'bar': 'bar2'
> 'bar': None
> 'bar': 0
> 'bar': True
> 
> So, i.e., from the first string I would to get:
>   'BAR': 'bar2'
> 
> 
> Any help? please
> Thanks in advance

Well your pattern is identifying the right bits, but re.sub() replaces
everything it matches:

>>> import re
>>> strings = """\
... 'bar': 'bar2'
... 'bar': None
... 'bar': 0
... 'bar': True""".split("\n")
>>> for s in strings:
...     print re.sub("'(?P<id>\w+)': [^{]", "\g<id>FOO", s)
...
barFOObar2'
barFOOone
barFOO
barFOOrue
>>>

What you need to fix is the replacement. Take a look at the
documentation for re.sub: you will need to provide a function to apply
the upper-case transformation, and the example there should show you how.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From lie.1296 at gmail.com  Sun Mar  7 08:12:23 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Mon, 08 Mar 2010 00:12:23 +1100
Subject: Asynchronous HTTP client
In-Reply-To: <b212d954-6eb0-43d3-80ac-6cd854a1a560@b36g2000pri.googlegroups.com>
References: <b212d954-6eb0-43d3-80ac-6cd854a1a560@b36g2000pri.googlegroups.com>
Message-ID: <4b93a660$1@dnews.tpgi.com.au>

On 03/07/2010 05:53 PM, Ping wrote:
> Hi,
> 
> I'm trying to find a way to create an asynchronous HTTP client so I
> can get responses from web servers in a way like
> 
>   async_http_open('http://example.com/', callback_func)
>   # immediately continues, and callback_func is called with response
> as arg when it is ready
> 
> It seems twisted can do it, but I hesitate to bring in such a big
> package as a dependency because my client should be light. Asyncore
> and asynchat are lighter but they don't speak HTTP. The asynchttp
> project on sourceforge is a fusion between asynchat and httplib, but
> it hasn't been updated since 2001 and is seriously out of sync with
> httplib.
> 
> I'd appreciate it if anyone can shed some lights on this.

If you want something quite lightweight, you can spawn a thread for the
call:

import threading, urllib
class AsyncOpen(threading.Thread):
    def __init__(self, url, callback):
        super(AsyncOpen, self).__init__()
        self.url = url
        self.callback = callback
    def run(self):
        # of course change urllib to httplib-something-something
        content = urllib.urlopen(self.url).read()
        self.callback(content)

def asyncopen(url, callback):
    AsyncOpen(url, callback).start()

def cb(content):
    print content

asyncopen('http://www.google.com', cb)


From exarkun at twistedmatrix.com  Sun Mar  7 08:16:04 2010
From: exarkun at twistedmatrix.com (exarkun at twistedmatrix.com)
Date: Sun, 07 Mar 2010 13:16:04 -0000
Subject: Asynchronous HTTP client
In-Reply-To: <b212d954-6eb0-43d3-80ac-6cd854a1a560@b36g2000pri.googlegroups.com>
References: <b212d954-6eb0-43d3-80ac-6cd854a1a560@b36g2000pri.googlegroups.com>
Message-ID: <20100307131604.2792.1008062813.divmod.xquotient.1336@localhost.localdomain>

On 06:53 am, ping.nsr.yeh at gmail.com wrote:
>Hi,
>
>I'm trying to find a way to create an asynchronous HTTP client so I
>can get responses from web servers in a way like
>
>  async_http_open('http://example.com/', callback_func)
>  # immediately continues, and callback_func is called with response
>as arg when it is ready
>
>It seems twisted can do it, but I hesitate to bring in such a big
>package as a dependency because my client should be light. Asyncore
>and asynchat are lighter but they don't speak HTTP. The asynchttp
>project on sourceforge is a fusion between asynchat and httplib, but
>it hasn't been updated since 2001 and is seriously out of sync with
>httplib.

Why should it be "light"?  In what way would using Twisted cause 
problems for you?

Jean-Paul


From python.list at tim.thechases.com  Sun Mar  7 08:35:31 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Sun, 07 Mar 2010 07:35:31 -0600
Subject: Problem with regular expression
In-Reply-To: <2dd22712-057a-42a7-9f21-349a56094339@c16g2000yqd.googlegroups.com>
References: <2dd22712-057a-42a7-9f21-349a56094339@c16g2000yqd.googlegroups.com>
Message-ID: <4B93ABA3.7090608@tim.thechases.com>

Joan Miller wrote:
> I would to convert the first string to upper case. But this regular
> expression is not matching the first string between quotes.
> 
>   re.sub("'(?P<id>\w+)': [^{]", "\g<id>FOO", str)

Well, my first thought is that you're not using raw strings, so 
you're not using the regexps and replacements you think you are.

   r"'(?P<id>\w+)': [^{]"

will match the lines of interest.  The replacement will eat the 
opening & closing single-quote, colon, and first character.

> # string to non-matching
> 'foo': {
> 
> # strings to matching
> 'bar': 'bar2'
> 'bar': None
> 'bar': 0
> 'bar': True
> 
> So, i.e., from the first string I would to get:
>   'BAR': 'bar2'

I think you'd have to use a function/lambda to do the 
case-conversion:

   re.sub(
     r"'(?P<id>\w+)(?=': [^{])",
     lambda m: "'" + m.group('id').upper(),
     string_of_interest
     )

Or you could just forgo regexps and use regular string functions 
like split(), startswith(), and upper()

-tkc






From googler.1.webmaster at spamgourmet.com  Sun Mar  7 08:50:59 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Sun, 7 Mar 2010 05:50:59 -0800 (PST)
Subject: time_struct
Message-ID: <23dbe409-60ed-4f6f-bd38-4336e4f1b3d0@f8g2000yqn.googlegroups.com>

Hi,

can anyone tell me how to return a time_struct from the timemodule in
my own C-Module?
Is that possible? I can just find one function in timefuncs.h, but it
doesnt return any PyObject.

Thanks in advance.

moerchendiser2k3


From ptmcg at austin.rr.com  Sun Mar  7 09:10:55 2010
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Sun, 7 Mar 2010 06:10:55 -0800 (PST)
Subject: Problem with regular expression
References: <2dd22712-057a-42a7-9f21-349a56094339@c16g2000yqd.googlegroups.com>
Message-ID: <2694479f-fce9-48ff-9264-fa35fdf103b3@z35g2000yqd.googlegroups.com>

On Mar 7, 4:32?am, Joan Miller <pelok... at gmail.com> wrote:
> I would to convert the first string to upper case. But this regular
> expression is not matching the first string between quotes.
>
Is using pyparsing overkill?  Probably.  But your time is valuable,
and pyparsing let's you knock this out in less time than it probably
took to write your original post.


Use pyparsing's pre-defined expression sglQuotedString to match your
entry key in quotes:

    key = sglQuotedString

Add a parse action to convert to uppercase:

    key.setParseAction(lambda tokens:tokens[0].upper())

Now define the rest of your entry value (be sure to add the negative
lookahead so we *don't* match your foo entry):

    entry = key + ":" + ~Literal("{")

If I put your original test cases into a single string named 'data', I
can now use transformString to convert all of your keys that don't
point to '{'ed values:

    print entry.transformString(data)

Giving me:

    # string to non-matching
    'foo': {

    # strings to matching
    'BAR': 'bar2'
    'BAR': None
    'BAR': 0
    'BAR': True

Here's the whole script:

    from pyparsing import sglQuotedString, Literal

    key = sglQuotedString
    key.setParseAction(lambda tokens:tokens[0].upper())
    entry = key + ":" + ~Literal("{")

    print entry.transformString(data)

And I'll bet that if you come back to this code in 3 months, you'll
still be able to figure out what it does!

-- Paul


From ping.nsr.yeh at gmail.com  Sun Mar  7 09:40:36 2010
From: ping.nsr.yeh at gmail.com (pingooo)
Date: Sun, 7 Mar 2010 22:40:36 +0800
Subject: Asynchronous HTTP client
In-Reply-To: <20100307131604.2792.1008062813.divmod.xquotient.1336@localhost.localdomain>
References: <b212d954-6eb0-43d3-80ac-6cd854a1a560@b36g2000pri.googlegroups.com>
	<20100307131604.2792.1008062813.divmod.xquotient.1336@localhost.localdomain>
Message-ID: <30c3a3701003070640y19772987s50b583aa54e535d5@mail.gmail.com>

2010/3/7 <exarkun at twistedmatrix.com>

> On 06:53 am, ping.nsr.yeh at gmail.com wrote:
>
>> Hi,
>>
>> I'm trying to find a way to create an asynchronous HTTP client so I
>> can get responses from web servers in a way like
>>
>>  async_http_open('http://example.com/', callback_func)
>>  # immediately continues, and callback_func is called with response
>> as arg when it is ready
>>
>> It seems twisted can do it, but I hesitate to bring in such a big
>> package as a dependency because my client should be light. Asyncore
>> and asynchat are lighter but they don't speak HTTP. The asynchttp
>> project on sourceforge is a fusion between asynchat and httplib, but
>> it hasn't been updated since 2001 and is seriously out of sync with
>> httplib.
>>
>
> Why should it be "light"?  In what way would using Twisted cause problems
> for you?
>
> Jean-Paul
>

I'm writing an open source python client for a web service. The client may
be used in all kinds of environments - Linux, Mac OS X, Windows, web
hosting, etc by others. It is not impossible to have twisted as a
dependency, but that makes deployment a larger job than simply uploading a
Python file.

I'm willing to use twisted, but I'd like to explore lighter alternatives
first.

Thanks,
Ping
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From stefan_ml at behnel.de  Sun Mar  7 09:57:02 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sun, 07 Mar 2010 15:57:02 +0100
Subject: compiler with python
In-Reply-To: <d698368f1003060507g13ee8d5ck9c2aff6c0388d49c@mail.gmail.com>
References: <d698368f1003060507g13ee8d5ck9c2aff6c0388d49c@mail.gmail.com>
Message-ID: <hn0eru$fja$2@dough.gmane.org>

mohamed issolah, 06.03.2010 14:07:
> I want to create a compiler which transform a code like pascal code (that
> what I do in C) to "quad"
> In C, I use BISON and FLEX tools.

Hi,

please stop starting new threads for the same topic. Instead, reply to 
responses you get.

Stefan



From exarkun at twistedmatrix.com  Sun Mar  7 09:57:07 2010
From: exarkun at twistedmatrix.com (exarkun at twistedmatrix.com)
Date: Sun, 07 Mar 2010 14:57:07 -0000
Subject: Asynchronous HTTP client
In-Reply-To: <30c3a3701003070640y19772987s50b583aa54e535d5@mail.gmail.com>
References: <b212d954-6eb0-43d3-80ac-6cd854a1a560@b36g2000pri.googlegroups.com>
	<20100307131604.2792.1008062813.divmod.xquotient.1336@localhost.localdomain>
	<30c3a3701003070640y19772987s50b583aa54e535d5@mail.gmail.com>
Message-ID: <20100307145707.2792.1316685222.divmod.xquotient.1369@localhost.localdomain>

On 02:40 pm, ping.nsr.yeh at gmail.com wrote:
>2010/3/7 <exarkun at twistedmatrix.com>
>>On 06:53 am, ping.nsr.yeh at gmail.com wrote:
>>>Hi,
>>>
>>>I'm trying to find a way to create an asynchronous HTTP client so I
>>>can get responses from web servers in a way like
>>>
>>>  async_http_open('http://example.com/', callback_func)
>>>  # immediately continues, and callback_func is called with response
>>>as arg when it is ready
>>>
>>>It seems twisted can do it, but I hesitate to bring in such a big
>>>package as a dependency because my client should be light. Asyncore
>>>and asynchat are lighter but they don't speak HTTP. The asynchttp
>>>project on sourceforge is a fusion between asynchat and httplib, but
>>>it hasn't been updated since 2001 and is seriously out of sync with
>>>httplib.
>>
>>Why should it be "light"?  In what way would using Twisted cause 
>>problems
>>for you?
>>
>>Jean-Paul
>
>I'm writing an open source python client for a web service. The client 
>may
>be used in all kinds of environments - Linux, Mac OS X, Windows, web
>hosting, etc by others. It is not impossible to have twisted as a
>dependency, but that makes deployment a larger job than simply 
>uploading a
>Python file.

Twisted is packaged for many Linux distributions (perhaps most of them). 
Many web hosts provide it.  It's also shipped with OS X.

Windows may be an issue, but note that there's a binary Windows 
installer (as of 10.0, an MSI, so installation can be easily automated).
>I'm willing to use twisted, but I'd like to explore lighter 
>alternatives
>first.

Jean-Paul


From vicente.soler at gmail.com  Sun Mar  7 10:05:26 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sun, 7 Mar 2010 07:05:26 -0800 (PST)
Subject: a simple def how-to
Message-ID: <092afce7-8365-4d52-a08b-e69c07771684@z35g2000yqd.googlegroups.com>

Hello,

My script starts like this:

book=readFromExcelRange('book')
house=readFromExcelRange('house')
table=readFromExcelRange('table')
read=readFromExcelRange('read')
...

But I would like to have something equivalent, like...

ranges=['book','house','table','read']
for i in ranges:
    var[i]=readFromExcelRange(i)

which does not work. I assume I should be using globals() instead of
var, but I do not know how to write my script.

Can anybody help?


From breamoreboy at yahoo.co.uk  Sun Mar  7 10:16:25 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Sun, 07 Mar 2010 15:16:25 +0000
Subject: compiler with python
In-Reply-To: <hmuhf4$b73$1@news.eternal-september.org>
References: <d698368f1003060239g1b4393c5v632b07b833a28df@mail.gmail.com>		<4B923E68.1000104@ieee.org>	<d698368f1003060433y2189c120m6f6aa84f2255ba42@mail.gmail.com>	<4B927B23.2090009@ieee.org>	<mailman.411.1267910015.23598.python-list@python.org>
	<hmuhf4$b73$1@news.eternal-september.org>
Message-ID: <hn0fuq$kch$1@dough.gmane.org>

Alf and Steven Howe, please don't top post, it makes it all but 
impossible to follow a thread.  Darn!:)

Mark Lawrence.

Alf P. Steinbach wrote:
> Since Mohamed is talking about compilation I think it's more likely he's 
> talking about an intermediate program represention based on quad tuples 
> like
> 
>   (OP, DESTINATION, ARG1, ARG2)
> 
> Cheers,
> 
> - Alf
> 
> 
> * Steven Howe:
>> Is it possible he's talking about a 'quad core'? as in a CPU? In that 
>> case I think he wants
>> to optimize a python program for a multiprocessor core with four 
>> processors.
>>
>> sph
>>
>>
>> On 03/06/2010 07:56 AM, Dave Angel wrote:
>>> mohamed issolah wrote:
>>>>
>>>> 2010/3/6 Dave Angel <davea at ieee.org>
>>>>
>>>>> mohamed issolah wrote:
>>>>>
>>>>>> hey,
>>>>>>
>>>>>> How can I construct a compiler with python just for informatiom ., 
>>>>>> I have
>>>>>> habit to construct it with C language,
>>>>>>
>>>>>> sorry for my english ;-)
>>>>>>
>>>>>>
>>>>> You need to tell us what you're really trying to do, what tools you're
>>>>> willing to use, and probably why you want it.  And if you're not 
>>>>> sure about
>>>>> your English, keep the sentence structure straightforward.
>>>>>
>>>>> Let me make a couple of wild guesses:
>>>>>
>>>>
>>>>
>>>>> You want to design and build a compiler that takes xml information 
>>>>> as its
>>>>> source code, and compiles those xml files into Intel x86 machine 
>>>>> code.  The
>>>>> compiler and the resulting executable needs to run on an x86 Linux 
>>>>> machine.
>>>>>  Your previous experience was in doing this sort of thing in C, but 
>>>>> you want
>>>>> to try it with Python instead.  You want to do it without using the 
>>>>> lxml
>>>>> libraries.
>>>>>
>>>>> You want to build a python compiler, that takes python source code and
>>>>> produces Java byte code files.  You'd like to do this in C, but 
>>>>> don't want
>>>>> to use any of the available existing CPython or Jython source 
>>>>> code.  Your
>>>>> goal is not to make a commercially viable product, but to learn as 
>>>>> much as
>>>>> possible in the process.
>>>>>
>>>>>
>>>>> DaveA
>>>>>
>>>>
>>>> hey,
>>>>
>>>> I want to create a compiler which transform a code like pascal code 
>>>> (that
>>>> what I do in C) to "quad"
>>>> In C, I use BISON and FLEX tools.
>>>>
>>>>
>>> I've forwarded your message to the list, and fixed your top-posting 
>>> by moving your response to the bottom.  I don't have a clue what 
>>> "quad" is, unless it's a synonym for Forth.
>>>
>>> You haven't specified the OS you'll be using to run the compiler, nor 
>>> the one you're targeting, so some of these choices may not be 
>>> useful.  For example, the first one is Linux only.
>>>
>>> http://www.freenet.org.nz/python/pybison/
>>>     PyBison - Python binding for Bison/Flex
>>>
>>> http://freshmeat.net/projects/yeanpypa/
>>> http://www.slash-me.net/dev/snippets/yeanpypa/documentation.html
>>>
>>> http://www.python.org/community/sigs/retired/parser-sig/towards-standard/ 
>>>
>>>
>>> Or you could go here, which has links to (most of) these and others.
>>> http://wiki.python.org/moin/LanguageParsing
>>>
>>> DaveA



From jjposner at optimum.net  Sun Mar  7 10:23:35 2010
From: jjposner at optimum.net (John Posner)
Date: Sun, 07 Mar 2010 10:23:35 -0500
Subject: a simple def how-to
In-Reply-To: <092afce7-8365-4d52-a08b-e69c07771684@z35g2000yqd.googlegroups.com>
References: <092afce7-8365-4d52-a08b-e69c07771684@z35g2000yqd.googlegroups.com>
Message-ID: <4b93c4ce$0$31278$607ed4bc@cv.net>

On 3/7/2010 10:05 AM, vsoler wrote:
> Hello,
>
> My script starts like this:
>
> book=readFromExcelRange('book')
> house=readFromExcelRange('house')
> table=readFromExcelRange('table')
> read=readFromExcelRange('read')
> ...
>
> But I would like to have something equivalent, like...
>
> ranges=['book','house','table','read']
> for i in ranges:
>      var[i]=readFromExcelRange(i)
>
> which does not work. I assume I should be using globals() instead of
> var, but I do not know how to write my script.
>
> Can anybody help?

var = []    # create empty list
for i in ranges:
     var.append(readFromExcelRange(i))

  -or-

var = [ readFromExcelRange(i) for i in ranges ]

  -or-

var = map(readFromExcelRange, ranges)

-John


From usenot at geekmail.INVALID  Sun Mar  7 10:23:48 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Sun, 7 Mar 2010 16:23:48 +0100
Subject: a simple def how-to
References: <092afce7-8365-4d52-a08b-e69c07771684@z35g2000yqd.googlegroups.com>
Message-ID: <20100307162348.0995f801@geekmail.INVALID>

On Sun, 7 Mar 2010 07:05:26 -0800 (PST) vsoler
<vicente.soler at gmail.com> wrote:

> Hello,
> 
> My script starts like this:
> 
> book=readFromExcelRange('book')
> house=readFromExcelRange('house')
> table=readFromExcelRange('table')
> read=readFromExcelRange('read')
> ...
> 
> But I would like to have something equivalent, like...
> 
> ranges=['book','house','table','read']
> for i in ranges:
>     var[i]=readFromExcelRange(i)
> 
> which does not work. I assume I should be using globals() instead of
> var, but I do not know how to write my script.
> 
> Can anybody help?

One additional line, and it works (all the following code is untested,
I might have goofed it up somewhere, but you get the idea):

ranges=['book','house','table','read']
var = {}
for i in ranges:
    var[i]=readFromExcelRange(i)

Or, more succinctly:

var = dict((i, readFromExcelRange(i)) for i in ranges)

although that looks a bit crowded. Perhaps

rd = readFromExcelRange
var = dict((i, rd(i)) for i in ranges)

looks better, but not by much, IMO.

In Python 3 you can also just say

var = {i:readFromExcelRange(i) for i in ranges}

(I think. I don't have Python 3.) This looks comparatively neat,
because there are no nesting parens.


And just in case you think it's a good idea to meddle with globals and
create actual "variables": it's not. You absolutely want dictionaries
here. It's basically a bad idea to create names *implicitly* that
you're going to use *explicitly*. (That is, it is in Python anyway,
because it does not provide a clean and clear way of doing this. Other
languages might provide that sort of thing, and it might be awesome,
but in Python, no sir.)

/W

-- 
INVALID? DE!



From vicente.soler at gmail.com  Sun Mar  7 10:57:30 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sun, 7 Mar 2010 07:57:30 -0800 (PST)
Subject: a simple def how-to
References: <092afce7-8365-4d52-a08b-e69c07771684@z35g2000yqd.googlegroups.com>
	<20100307162348.0995f801@geekmail.INVALID>
Message-ID: <9c89873d-15a4-42bc-b30d-572a7111263d@t23g2000yqt.googlegroups.com>

On 7 mar, 16:23, Andreas Waldenburger <use... at geekmail.INVALID> wrote:
> On Sun, 7 Mar 2010 07:05:26 -0800 (PST) vsoler
>
>
>
> <vicente.so... at gmail.com> wrote:
> > Hello,
>
> > My script starts like this:
>
> > book=readFromExcelRange('book')
> > house=readFromExcelRange('house')
> > table=readFromExcelRange('table')
> > read=readFromExcelRange('read')
> > ...
>
> > But I would like to have something equivalent, like...
>
> > ranges=['book','house','table','read']
> > for i in ranges:
> > ? ? var[i]=readFromExcelRange(i)
>
> > which does not work. I assume I should be using globals() instead of
> > var, but I do not know how to write my script.
>
> > Can anybody help?
>
> One additional line, and it works (all the following code is untested,
> I might have goofed it up somewhere, but you get the idea):
>
> ranges=['book','house','table','read']
> var = {}
> for i in ranges:
> ? ? var[i]=readFromExcelRange(i)
>
> Or, more succinctly:
>
> var = dict((i, readFromExcelRange(i)) for i in ranges)
>
> although that looks a bit crowded. Perhaps
>
> rd = readFromExcelRange
> var = dict((i, rd(i)) for i in ranges)
>
> looks better, but not by much, IMO.
>
> In Python 3 you can also just say
>
> var = {i:readFromExcelRange(i) for i in ranges}
>
> (I think. I don't have Python 3.) This looks comparatively neat,
> because there are no nesting parens.
>
> And just in case you think it's a good idea to meddle with globals and
> create actual "variables": it's not. You absolutely want dictionaries
> here. It's basically a bad idea to create names *implicitly* that
> you're going to use *explicitly*. (That is, it is in Python anyway,
> because it does not provide a clean and clear way of doing this. Other
> languages might provide that sort of thing, and it might be awesome,
> but in Python, no sir.)
>
> /W
>
> --
> INVALID? DE!

Thank you Andreas.

Your comprehensive answer makes a lot of sense to me.


From vicente.soler at gmail.com  Sun Mar  7 10:59:30 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sun, 7 Mar 2010 07:59:30 -0800 (PST)
Subject: a simple def how-to
References: <092afce7-8365-4d52-a08b-e69c07771684@z35g2000yqd.googlegroups.com>
	<4b93c4ce$0$31278$607ed4bc@cv.net>
Message-ID: <63b9d9e5-cd46-4e96-b8e5-e791ad6e9a1e@i25g2000yqm.googlegroups.com>

On 7 mar, 16:23, John Posner <jjpos... at optimum.net> wrote:
> On 3/7/2010 10:05 AM, vsoler wrote:
>
>
>
> > Hello,
>
> > My script starts like this:
>
> > book=readFromExcelRange('book')
> > house=readFromExcelRange('house')
> > table=readFromExcelRange('table')
> > read=readFromExcelRange('read')
> > ...
>
> > But I would like to have something equivalent, like...
>
> > ranges=['book','house','table','read']
> > for i in ranges:
> > ? ? ?var[i]=readFromExcelRange(i)
>
> > which does not work. I assume I should be using globals() instead of
> > var, but I do not know how to write my script.
>
> > Can anybody help?
>
> var = [] ? ?# create empty list
> for i in ranges:
> ? ? ?var.append(readFromExcelRange(i))
>
> ? -or-
>
> var = [ readFromExcelRange(i) for i in ranges ]
>
> ? -or-
>
> var = map(readFromExcelRange, ranges)
>
> -John

John,

Thank you for your help. Perhaps the solution you are suggesting is
not exactly what I was looking for, but helped anyway.


From jjposner at optimum.net  Sun Mar  7 11:16:36 2010
From: jjposner at optimum.net (John Posner)
Date: Sun, 07 Mar 2010 11:16:36 -0500
Subject: a simple def how-to
In-Reply-To: <63b9d9e5-cd46-4e96-b8e5-e791ad6e9a1e@i25g2000yqm.googlegroups.com>
References: <092afce7-8365-4d52-a08b-e69c07771684@z35g2000yqd.googlegroups.com>
	<4b93c4ce$0$31278$607ed4bc@cv.net>
	<63b9d9e5-cd46-4e96-b8e5-e791ad6e9a1e@i25g2000yqm.googlegroups.com>
Message-ID: <4B93D164.3060309@optimum.net>

On 3/7/2010 10:59 AM, vsoler wrote:
>
> Thank you for your help. Perhaps the solution you are suggesting is
> not exactly what I was looking for, but helped anyway.

Oops, I was thinking list, not dict. Too fast, and not enough coffee!

-John




From vicente.soler at gmail.com  Sun Mar  7 11:23:13 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sun, 7 Mar 2010 08:23:13 -0800 (PST)
Subject: Duplicate keys in dict?
Message-ID: <21f87f60-fea2-417a-a092-64363b5b280e@y11g2000yqh.googlegroups.com>

Hello,

My code snippet reads data from excel ranges. First row and first
column are column headers and row headers respectively. After reding
the range I build a dict.

................'A'..............'B'
'ab'............3................5
'cd'............7................2
'cd'............9................1
'ac'............7................2

d={('ab','A'): 3, ('ab','B'): 5, ('cd','A'): 7, ...

However, as you can see there are two rows that start with 'cd', and
dicts, AFAIK do not accept duplicates.

What is the best workaround for this? Should I discard dicts? Should I
somehow have under 'cd'... a list of values?

One of the difficulties I find here is that I want to be able to
easily sum all the values for each row key:  'ab', 'cd' and 'ac'.
However, using lists inside dicts makes it a difficult issue for me.

What is the best approach for this problem? Can anybody help?


From steve at REMOVE-THIS-cybersource.com.au  Sun Mar  7 11:42:59 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 07 Mar 2010 16:42:59 GMT
Subject: a simple def how-to
References: <092afce7-8365-4d52-a08b-e69c07771684@z35g2000yqd.googlegroups.com>
Message-ID: <4b93d793$0$8836$c3e8da3@news.astraweb.com>

On Sun, 07 Mar 2010 07:05:26 -0800, vsoler wrote:

> Hello,
> 
> My script starts like this:
> 
> book=readFromExcelRange('book')
> house=readFromExcelRange('house')
> table=readFromExcelRange('table')
> read=readFromExcelRange('read')
> ...
> 
> But I would like to have something equivalent, like...
> 
> ranges=['book','house','table','read'] 
> for i in ranges:
>     var[i]=readFromExcelRange(i)
> 
> which does not work. I assume I should be using globals() instead of
> var, but I do not know how to write my script.
> 
> Can anybody help?

Yes. Use a dict instead.

ranges=['book','house','table','read']
data = {}
for name in ranges:
    data[name] = readFromExcelRange(name)

# and later...

item = 'table'
print "The range '%s' is %s" % (item, data[item])



-- 
Steven


From news123 at free.fr  Sun Mar  7 11:46:02 2010
From: news123 at free.fr (News123)
Date: Sun, 07 Mar 2010 17:46:02 +0100
Subject: Duplicate keys in dict?
In-Reply-To: <21f87f60-fea2-417a-a092-64363b5b280e@y11g2000yqh.googlegroups.com>
References: <21f87f60-fea2-417a-a092-64363b5b280e@y11g2000yqh.googlegroups.com>
Message-ID: <4b93d84b$0$10084$426a74cc@news.free.fr>

vsoler wrote:
> Hello,
> 
> My code snippet reads data from excel ranges. First row and first
> column are column headers and row headers respectively. After reding
> the range I build a dict.
> 
> ................'A'..............'B'
> 'ab'............3................5
> 'cd'............7................2
> 'cd'............9................1
> 'ac'............7................2
> 
> d={('ab','A'): 3, ('ab','B'): 5, ('cd','A'): 7, ...
> 
> However, as you can see there are two rows that start with 'cd', and
> dicts, AFAIK do not accept duplicates.

Normall dicts are used if you want to access your data at a later point
in time by the key name.

Do you want to be able to do this?


Then what would you expect to receive for d[('cd','A')] ?

The first value? the second value? both values?

Could you perhaps change further occurences of 'cd' with 'cd1' , 'cd2' ,
'cd3',  ... ?

Not knowing your exact context makes it difficult to suggest solutions?

perhaps you could switch to a list containing a tuple of (rowname,rowdict)


l = [ ('ab', { 'A': 3 , 'B': 5 } ),
       'cd', { 'A': 7 , 'B': 2 } ),
       'cd', { 'A': 9 , 'B': 1 } ),
       'ac', { ... }
    ]


bye

N

> 
> What is the best workaround for this? Should I discard dicts? Should I
> somehow have under 'cd'... a list of values?
> 
> One of the difficulties I find here is that I want to be able to
> easily sum all the values for each row key:  'ab', 'cd' and 'ac'.
> However, using lists inside dicts makes it a difficult issue for me.
> 
> What is the best approach for this problem? Can anybody help?


From steve at REMOVE-THIS-cybersource.com.au  Sun Mar  7 11:53:55 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 07 Mar 2010 16:53:55 GMT
Subject: Duplicate keys in dict?
References: <21f87f60-fea2-417a-a092-64363b5b280e@y11g2000yqh.googlegroups.com>
Message-ID: <4b93da23$0$8836$c3e8da3@news.astraweb.com>

On Sun, 07 Mar 2010 08:23:13 -0800, vsoler wrote:

> Hello,
> 
> My code snippet reads data from excel ranges. First row and first column
> are column headers and row headers respectively. After reding the range
> I build a dict.
> 
> ................'A'..............'B'
> 'ab'............3................5
> 'cd'............7................2
> 'cd'............9................1
> 'ac'............7................2
> 
> d={('ab','A'): 3, ('ab','B'): 5, ('cd','A'): 7, ...
> 
> However, as you can see there are two rows that start with 'cd', and
> dicts, AFAIK do not accept duplicates.

> One of the difficulties I find here is that I want to be able to easily
> sum all the values for each row key:  'ab', 'cd' and 'ac'. However,
> using lists inside dicts makes it a difficult issue for me.

Given the sample above, what answer do you expect for summing the 'cd' 
row? There are four reasonable answers:

7 + 2 = 9
9 + 1 = 10
7 + 2 + 9 + 1 = 19
Error

You need to decide what you want to do before asking how to do it.



-- 
Steven


From vicente.soler at gmail.com  Sun Mar  7 12:13:13 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sun, 7 Mar 2010 09:13:13 -0800 (PST)
Subject: Duplicate keys in dict?
References: <21f87f60-fea2-417a-a092-64363b5b280e@y11g2000yqh.googlegroups.com>
	<4b93da23$0$8836$c3e8da3@news.astraweb.com>
Message-ID: <70b3224d-a8d1-4182-8609-0b96270fa13e@33g2000yqj.googlegroups.com>

On 7 mar, 17:53, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Sun, 07 Mar 2010 08:23:13 -0800, vsoler wrote:
> > Hello,
>
> > My code snippet reads data from excel ranges. First row and first column
> > are column headers and row headers respectively. After reding the range
> > I build a dict.
>
> > ................'A'..............'B'
> > 'ab'............3................5
> > 'cd'............7................2
> > 'cd'............9................1
> > 'ac'............7................2
>
> > d={('ab','A'): 3, ('ab','B'): 5, ('cd','A'): 7, ...
>
> > However, as you can see there are two rows that start with 'cd', and
> > dicts, AFAIK do not accept duplicates.
> > One of the difficulties I find here is that I want to be able to easily
> > sum all the values for each row key: ?'ab', 'cd' and 'ac'. However,
> > using lists inside dicts makes it a difficult issue for me.
>
> Given the sample above, what answer do you expect for summing the 'cd'
> row? There are four reasonable answers:
>
> 7 + 2 = 9
> 9 + 1 = 10
> 7 + 2 + 9 + 1 = 19
> Error
>
> You need to decide what you want to do before asking how to do it.
>
> --
> Steven

Steven,

What I need is that sum(('cd','A')) gives me 16, sum(('cd','B')) gives
me 3.

I apologize for not having made it clear.


From rjngrj2010 at gmail.com  Sun Mar  7 12:16:04 2010
From: rjngrj2010 at gmail.com (gujax)
Date: Sun, 7 Mar 2010 09:16:04 -0800 (PST)
Subject: importerror: module Gnuplot missing
Message-ID: <e4c0f9ce-fa54-4ec4-9870-b75264424b33@15g2000yqi.googlegroups.com>

Hi,
I need help. I am trying to follow examples from a book "Python
Scripting for Computational Science" and the examples are all plotted
using Gnuplot. When I run the programs I get error saying "importerror
Gnuplot module missing".

I have installed Gnuplot in C:\My Programs\gnuplot directory (running
on WinME). I have installed python 2.5 and Gnuplot 4.2. I have also
installed Gnuplot-py-1.8 in Python's site-packages.

All paths are correctly set as I can see from sys.path argument i.e.,
path for gnuplot is set and so also the python path and scripting path
which is where book examples reside. Many examples did run well until
it came down to plotting...

I also ran 'python test.py' from Gnuplot-py-1.8 directory and
strangely it runs and then asks me to press return to see result. The
screen then freezes and the computer hangs. I have to reboot it again.
Some one suggested in the old archives that I should change in the
utils the code

import Gnuplot,utils to
import utils
from _Gnuplot import Gnuplot

I have tried it but same result. Window freezes and my "C:\Windows\ "
directory gets filled with fff #...tmp files. I have no idea what are
those.

My other attempts:
1. Is there an issue how one names the directory - gnuplot versus
Gnuplot etc...
2. I have done things like >>> from numpy import oldnumeric. And the
test runs fine.
3. "python setup.py" install for installing Gnuplot-py-1.8 also ran
fine.
4. I could from "\gnuplot\bin" directory open wgnuplot and in the
Gnuplot window could plot sinx/x.
5. I also have a pgnuplot application
6. Is the gnuplot version incompatible with Python 2.5 and its
associated older numpy versions..

I have seen several similar "missing Gnuplot" reports in the archive
but did not find any resolution to those. I will appreciate any help,
Thanks
gujax



From stefan_ml at behnel.de  Sun Mar  7 12:17:01 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sun, 07 Mar 2010 18:17:01 +0100
Subject: a simple def how-to
In-Reply-To: <092afce7-8365-4d52-a08b-e69c07771684@z35g2000yqd.googlegroups.com>
References: <092afce7-8365-4d52-a08b-e69c07771684@z35g2000yqd.googlegroups.com>
Message-ID: <hn0n2d$aro$1@dough.gmane.org>

vsoler, 07.03.2010 16:05:
> Hello,
>
> My script starts like this:
>
> book=readFromExcelRange('book')
> house=readFromExcelRange('house')
> table=readFromExcelRange('table')
> read=readFromExcelRange('read')
> ...
>
> But I would like to have something equivalent, like...
>
> ranges=['book','house','table','read']
> for i in ranges:
>      var[i]=readFromExcelRange(i)

Note that the name "i" is rather badly chosen as it generally implies a 
totally different thing (integer) than what you use it for (names of ranges).

"ranges" seems to fall into the same bucket, but I guess that's just 
because I can't extract the meaning from your code snippet (which is not a 
good sign).

Try to use expressive names in your code, so that people who look at it for 
the first time get an idea about what it does with what kind of data.

Stefan



From karun.madhan at gmail.com  Sun Mar  7 13:09:47 2010
From: karun.madhan at gmail.com (madhan)
Date: Sun, 7 Mar 2010 10:09:47 -0800 (PST)
Subject: click me
Message-ID: <b9cb1d94-d6bf-4ed9-b06a-0089d6135ad9@b36g2000pri.googlegroups.com>

please clic it it will be usefull to you

 http://123maza.com/78/healthyfitness/


From miraclesoul at hotmail.com  Sun Mar  7 13:55:24 2010
From: miraclesoul at hotmail.com (Fahad Ahmad)
Date: Sun, 7 Mar 2010 18:55:24 +0000
Subject: Calculating very large exponents in python
Message-ID: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>


Dear All,

i am writing my crytographic scheme in python, i am just a new user to it. 
I have written the complete code, the only point i am stuck it is that i am using 256 exponentiation which is normal in crytography but python just hangs on it.

g**x  [where both g and x are 256 bit numbers , in decimal they are around 77]

after reading several forums, i just come to know it can be done using numpy, i have installed python(x,y) has has both numpy and scipy installed but i am not able to make it happen.

any idea which library, module, or piece of code can solve this mystery :S

sorry for bad english

"People
come and go no one remembers them for life but it is the time spent
with them that become Sweet memories that are remembered for life 
hope I leave some memories behind " 

 		 	   		  
_________________________________________________________________
Your E-mail and More On-the-Go. Get Windows Live Hotmail Free.
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From python.list at tim.thechases.com  Sun Mar  7 14:11:18 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Sun, 07 Mar 2010 13:11:18 -0600
Subject: Duplicate keys in dict?
In-Reply-To: <70b3224d-a8d1-4182-8609-0b96270fa13e@33g2000yqj.googlegroups.com>
References: <21f87f60-fea2-417a-a092-64363b5b280e@y11g2000yqh.googlegroups.com>	<4b93da23$0$8836$c3e8da3@news.astraweb.com>
	<70b3224d-a8d1-4182-8609-0b96270fa13e@33g2000yqj.googlegroups.com>
Message-ID: <4B93FA56.20100@tim.thechases.com>

vsoler wrote:
> On 7 mar, 17:53, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
>> On Sun, 07 Mar 2010 08:23:13 -0800, vsoler wrote:
>>> Hello,
>>> My code snippet reads data from excel ranges. First row and first column
>>> are column headers and row headers respectively. After reding the range
>>> I build a dict.
>>> ................'A'..............'B'
>>> 'ab'............3................5
>>> 'cd'............7................2
>>> 'cd'............9................1
>>> 'ac'............7................2
>>> d={('ab','A'): 3, ('ab','B'): 5, ('cd','A'): 7, ...
>>> However, as you can see there are two rows that start with 'cd', and
>>> dicts, AFAIK do not accept duplicates.
>>> One of the difficulties I find here is that I want to be able to easily
>>> sum all the values for each row key:  'ab', 'cd' and 'ac'. However,
>>> using lists inside dicts makes it a difficult issue for me.
> 
> What I need is that sum(('cd','A')) gives me 16, sum(('cd','B')) gives
> me 3.

But you really *do* want lists inside the dict if you want to be 
able to call sum() on them.  You want to map the tuple ('cd','A') 
to the list [7,9] so you can sum the results.  And if you plan to 
sum the results, it's far easier to have one-element lists and 
just sum them, instead of having to special case "if it's a list, 
sum it, otherwise, return the value".  So I'd use something like

   import csv
   f = file(INFILE, 'rb')
   r = csv.reader(f, ...)
   headers = r.next() # discard the headers
   d = defaultdict(list)
   for (label, a, b) in r:
     d[(label, 'a')].append(int(a))
     d[(label, 'b')].append(int(b))
   # ...
   for (label, col), value in d.iteritems():
     print label, col, 'sum =', sum(value)

Alternatively, if you don't need to store the intermediate 
values, and just want to store the sums, you can accrue them as 
you go along:

   d = defaultdict(int)
   for (label, a, b) in r:
     d[(label, 'a')] += int(a)
     d[(label, 'b')] += int(b)
   # ...
   for (label, col), value in d.iteritems():
     print label, col, 'sum =', value

Both are untested, but I'm pretty sure they're both viable, 
modulo my sleep-deprived eyes.

-tkc






From python at rgbaz.eu  Sun Mar  7 14:26:57 2010
From: python at rgbaz.eu (PythonAB)
Date: Sun, 7 Mar 2010 20:26:57 +0100
Subject: Bluetooth
Message-ID: <BD5B58B2-7774-4F42-90BC-5D0AF8CC82F7@rgbaz.eu>

Hello,


I'm writing a script that has to connect a bluetooth device
with a 3D application.
On my search for a bluetooth module i ran into this:
http://www.python.org/download/releases/2.4/notes/
where it says:
"The socket module now supports Bluetooth sockets,
if the system has <bluetooth/bluetooth.h>"

Yet I can't find anything at all in the socket manuals
nor anywhere else on the site...

Does the socket module really support Bluetooth out of the box?
I've used socket before but never read anything about bluetooth...

Maybe I need to get the bluetooth.h file, but i have no idea what I
am supposed to do with it...

Can anyone shed some light on this for me please?

thanks in advance,

gr
Arno
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From debatem1 at gmail.com  Sun Mar  7 15:40:59 2010
From: debatem1 at gmail.com (geremy condra)
Date: Sun, 7 Mar 2010 15:40:59 -0500
Subject: Calculating very large exponents in python
In-Reply-To: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>
References: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>
Message-ID: <f3cc57c61003071240x18b580bend946824ef7955b6c@mail.gmail.com>

On Sun, Mar 7, 2010 at 1:55 PM, Fahad Ahmad <miraclesoul at hotmail.com> wrote:
> Dear All,
>
> i am writing my crytographic scheme in python, i am just a new user to it.
> I have written the complete code, the only point i am stuck it is that i am
> using 256 exponentiation which is normal in crytography but python just
> hangs on it.
>
> g**x? [where both g and x are 256 bit numbers , in decimal they are around
> 77]
>
> after reading several forums, i just come to know it can be done using
> numpy, i have installed python(x,y) has has both numpy and scipy installed
> but i am not able to make it happen.
>
> any idea which library, module, or piece of code can solve this mystery :S
>
> sorry for bad english

A couple of things:

1) if you're working with modular exponentiation, remember that pow() takes
three arguments, ie:

a = 222222222222222222222222222
b = 5555555555555555555555555555
pow(a, b, 1200)

will calculate the correct answer (768) very quickly, while

a**b % 1200

has not terminated in the time it took me to compose this
email.

2) sage has a lot of excellent tools for crypto/cryptanalysis that you
may want to take a look at.

3) not saying you don't know what you're doing, but be careful when
rolling your own cryptosystems- even very good cryptographers make
implementation mistakes!

Geremy Condra


From vlastimil.brom at gmail.com  Sun Mar  7 16:04:42 2010
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Sun, 7 Mar 2010 22:04:42 +0100
Subject: negative "counts" in collections.Counter?
Message-ID: <9fdb569a1003071304x7265b331o58dc407c2a51307d@mail.gmail.com>

Hi all,
I'd like to ask about the possibility of negative "counts" in
collections.Counter (using Python 3.1);
I believe, my usecase is rather trivial, basically I have the word
frequencies of two texts and I want do compare them (e.g. to see what
was added and removed between different versions of a text).

This is simple enough to do with own code, but I thought, this would
be exactly the case for Counter...
However, as the Counter only returns positive counts, one has to get
the difference in both directions and combine them afterwards, maybe
something like:

>>> c1=collections.Counter("aabcddd")
>>> c2=collections.Counter("abbbd")
>>> added_c2 = c2-c1
>>> removed_c2 = c1-c2
>>> negative_added_c2 = dict((k, v*-1) for (k, v) in removed_c2.items())
>>> changed_c2 = dict(added_c2)
>>> changed_c2.update(negative_added_c2)
>>> changed_c2
{'a': -1, 'c': -1, 'b': 2, 'd': -2}
>>>

It seems to me, that with negative counts allowed in Counter, this
would simply be the matter of a single difference:
changed_c2 = c2 - c1

Is there a possibility to make the Counter work this way (other than
replacing its methods in a subclass, which might be comparable to
writing the naive counting class itself)?
Are there maybe some reasons I missed to disable negative counts here?
(As I could roughly understand, the Counter isn't quite limited to the
mathematical notion of multiset; it seems to accept negative counts,
but its methods only output the positive part).
Is this kind of task - a comparison in both directions - an unusual
one, or is it simply not the case for Counter?

Thanks in advance,
    vbr


From news123 at free.fr  Sun Mar  7 16:08:39 2010
From: news123 at free.fr (News123)
Date: Sun, 07 Mar 2010 22:08:39 +0100
Subject: killing own process in windows
Message-ID: <4b9415d7$0$19558$426a74cc@news.free.fr>

Hi,


How can I kill my own process?

Some multithreaded programs, that I have are unable to stop when ctrl-C
is pressed.
Some can't be stopped with sys.exit()

So I'd just like to terminate my own program.


Examples of non killable (not killable with CTRL-C) programs:
- A program, that started an XMLRPC server with serve_forever
- a program, that started a multiprocessing.Manager with serve_forever


thanks in advance for some ideas.


N


From news123 at free.fr  Sun Mar  7 16:26:41 2010
From: news123 at free.fr (News123)
Date: Sun, 07 Mar 2010 22:26:41 +0100
Subject: stopping a multiprocessing.managers.BaseManager nicely (looks like
	a hack)
Message-ID: <4b941a11$0$23919$426a74cc@news.free.fr>

Hi,


I have following program

from multiprocessing.managers import BaseManager
def myfunc():	return 3
class MyManager(BaseManager): pass
MyManager.register('myfunc',callable = myfunc)
m = MyManager(address=('127.0.0.1', 50000),authkey='abracadabra')
server = m.get_server()
server.serve_forever()


I'd like to replace server.serve_forever() with something, which is
abortable.

After digging in the sources I came up with following (in my opinion)
inelegant, but working solution.

I just copied the Server.serve_forever() function from
multiprocessing/managers.py and changed two lines.


Does anybody have a better idea than this:
# ------------------------------------------------
import multiprocessing.managers
from multiprocessing.managers import BaseManager
def serve_till_stop(self):
    '''
    Run the server forever
    '''
    #current_process()._manager_server = self # this lin removed
    multiprocessing.managers.current_process()._manager_server = self  #
this line added
    try:
        try:
            #while 1: # this line removed
            while self.running: # this line added
                try:
                    c = self.listener.accept()
                except (OSError, IOError):
                    continue
                t = threading.Thread(target=self.handle_request, args=(c,))
                t.daemon = True
                t.start()
        except (KeyboardInterrupt, SystemExit):
            pass
    finally:
        self.stop = 999
        self.listener.close()


def myfunc():	return 3
def stopme(): server.running = False
class MyManager(BaseManager): pass
MyManager.register('myfunc',callable = myfunc)
m = MyManager(address=('127.0.0.1', 50000),authkey='abracadabra')
server = m.get_server()
server.running = True
serve_till_stop(server)

thanks in advance and bye


N




From martin.hellwig at dcuktec.org  Sun Mar  7 16:28:16 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Sun, 07 Mar 2010 21:28:16 +0000
Subject: killing own process in windows
In-Reply-To: <4b9415d7$0$19558$426a74cc@news.free.fr>
References: <4b9415d7$0$19558$426a74cc@news.free.fr>
Message-ID: <hn15pd$3t7$1@news.eternal-september.org>

On 03/07/10 21:08, News123 wrote:
> Hi,
>
>
> How can I kill my own process?
>
> Some multithreaded programs, that I have are unable to stop when ctrl-C
> is pressed.
> Some can't be stopped with sys.exit()
>
> So I'd just like to terminate my own program.
>
>
> Examples of non killable (not killable with CTRL-C) programs:
> - A program, that started an XMLRPC server with serve_forever
> - a program, that started a multiprocessing.Manager with serve_forever
>
>
> thanks in advance for some ideas.
>
>
> N

If it is just the xml rpc server you want to kill, there might be better 
ways. For example look at:
http://code.google.com/p/dcuktec/source/browse/source/wrapped_xmlrpc_server/rpc.py
with perhaps special interest at the comment on lines 172-174.

-- 
mph


From news123 at free.fr  Sun Mar  7 16:47:51 2010
From: news123 at free.fr (News123)
Date: Sun, 07 Mar 2010 22:47:51 +0100
Subject: stopping a multiprocessing.managers.BaseManager nicely (looks
	like a hack)
In-Reply-To: <4b941a11$0$23919$426a74cc@news.free.fr>
References: <4b941a11$0$23919$426a74cc@news.free.fr>
Message-ID: <4b941f07$0$14923$426a34cc@news.free.fr>

My fix has certain problems:

News123 wrote:
> Hi,
> 
> 
> I have following program
> 
> from multiprocessing.managers import BaseManager
> def myfunc():	return 3
> class MyManager(BaseManager): pass
> MyManager.register('myfunc',callable = myfunc)
> m = MyManager(address=('127.0.0.1', 50000),authkey='abracadabra')
> server = m.get_server()
> server.serve_forever()
> 
> 
> I'd like to replace server.serve_forever() with something, which is
> abortable.
> 
> After digging in the sources I came up with following (in my opinion)
> inelegant, but working solution.
> 
> I just copied the Server.serve_forever() function from
> multiprocessing/managers.py and changed two lines.
> 
> 
> Does anybody have a better idea than this:
> # ------------------------------------------------
> import multiprocessing.managers
> from multiprocessing.managers import BaseManager
> def serve_till_stop(self):
>     '''
>     Run the server forever
>     '''
>     #current_process()._manager_server = self # this lin removed
>     multiprocessing.managers.current_process()._manager_server = self  #
> this line added
>     try:
>         try:
>             #while 1: # this line removed
>             while self.running: # this line added
>                 try:
>                     c = self.listener.accept()
>                 except (OSError, IOError):
>                     continue
>                 t = threading.Thread(target=self.handle_request, args=(c,))
>                 t.daemon = True
>                 t.start()
>         except (KeyboardInterrupt, SystemExit):
>             pass
>     finally:
>         self.stop = 999
>         self.listener.close()
Problems will now occur on he client side.
The server terminates now immediately after the function stopme has been
called.
The client however wants still to perform a few requests, before it
considers calling of stopme done.

So I still don't have a solution :-(

> 
> 
> def myfunc():	return 3
> def stopme(): server.running = False
> class MyManager(BaseManager): pass
> MyManager.register('myfunc',callable = myfunc)
> m = MyManager(address=('127.0.0.1', 50000),authkey='abracadabra')
> server = m.get_server()
> server.running = True
> serve_till_stop(server)
> 
> thanks in advance and bye
> 
> 
> N
> 
> 


From news123 at free.fr  Sun Mar  7 16:54:28 2010
From: news123 at free.fr (News123)
Date: Sun, 07 Mar 2010 22:54:28 +0100
Subject: killing own process in windows
In-Reply-To: <hn15pd$3t7$1@news.eternal-september.org>
References: <4b9415d7$0$19558$426a74cc@news.free.fr>
	<hn15pd$3t7$1@news.eternal-september.org>
Message-ID: <4b942094$0$25784$426a74cc@news.free.fr>

Hi Martin.
Hellwig wrote:
> On 03/07/10 21:08, News123 wrote:
>> Hi,
>>
>>
>> How can I kill my own process?
>>
>> Some multithreaded programs, that I have are unable to stop when ctrl-C
>> is pressed.
>> Some can't be stopped with sys.exit()
>>
>> So I'd just like to terminate my own program.
>>
>>
>> Examples of non killable (not killable with CTRL-C) programs:
>> - A program, that started an XMLRPC server with serve_forever
>> - a program, that started a multiprocessing.Manager with serve_forever
>>
>>
> If it is just the xml rpc server you want to kill, there might be better
> ways. For example look at:
> http://code.google.com/p/dcuktec/source/browse/source/wrapped_xmlrpc_server/rpc.py
> 
> with perhaps special interest at the comment on lines 172-174.
I



Thanks. this looks like a good solution for an XMLRPC server.
However when playing with different server modules I fall over and over
again over code, that can't be shutdown nicely.

Currently I'm still struggling with multiprocessing.managers,BaseManager

bye

N


From arnodel at googlemail.com  Sun Mar  7 17:21:27 2010
From: arnodel at googlemail.com (Arnaud Delobelle)
Date: Sun, 07 Mar 2010 22:21:27 +0000
Subject: negative "counts" in collections.Counter?
References: <mailman.437.1267995887.23598.python-list@python.org>
Message-ID: <m2eijv4vtk.fsf@googlemail.com>

Vlastimil Brom <vlastimil.brom at gmail.com> writes:

> Hi all,
> I'd like to ask about the possibility of negative "counts" in
> collections.Counter (using Python 3.1);
> I believe, my usecase is rather trivial, basically I have the word
> frequencies of two texts and I want do compare them (e.g. to see what
> was added and removed between different versions of a text).
>
> This is simple enough to do with own code, but I thought, this would
> be exactly the case for Counter...
> However, as the Counter only returns positive counts, one has to get
> the difference in both directions and combine them afterwards, maybe
> something like:
>
>>>> c1=collections.Counter("aabcddd")
>>>> c2=collections.Counter("abbbd")
>>>> added_c2 = c2-c1
>>>> removed_c2 = c1-c2
>>>> negative_added_c2 = dict((k, v*-1) for (k, v) in removed_c2.items())
>>>> changed_c2 = dict(added_c2)
>>>> changed_c2.update(negative_added_c2)
>>>> changed_c2
> {'a': -1, 'c': -1, 'b': 2, 'd': -2}
>>>>
>
> It seems to me, that with negative counts allowed in Counter, this
> would simply be the matter of a single difference:
> changed_c2 = c2 - c1
>
> Is there a possibility to make the Counter work this way (other than
> replacing its methods in a subclass, which might be comparable to
> writing the naive counting class itself)?
> Are there maybe some reasons I missed to disable negative counts here?
> (As I could roughly understand, the Counter isn't quite limited to the
> mathematical notion of multiset; it seems to accept negative counts,
> but its methods only output the positive part).
> Is this kind of task - a comparison in both directions - an unusual
> one, or is it simply not the case for Counter?

Every time I have needed something like collections.Counter, I have
wanted the behaviour you require too.  As a result, I have never used
collections.Counter.  Instead I have used plain dictionaries or my own
class.

I don't understand why the Counter's + and - operators behave as they
do.  Here is an example from the docs:

>>> c = Counter(a=3, b=1)
>>> d = Counter(a=1, b=2)
>>> c + d                       # add two counters together:  c[x] + d[x]
Counter({'a': 4, 'b': 3})
>>> c - d                       # subtract (keeping only positive counts)
Counter({'a': 2})
>>> c & d                       # intersection:  min(c[x], d[x])
Counter({'a': 1, 'b': 1})
>>> c | d                       # union:  max(c[x], d[x])
Counter({'a': 3, 'b': 2})

If + and - just added or subtracted the multiplicities of elements,
keeping negative multiplicites, we would get:

>>> c - d
Counter({'a':2, 'b':-1})

Which I think is useful in many cases.  But we could still get the
result of current c - d very simply:

>>> (c - d) | Counter() # | Counter() removes negative multiplicities
Counter({'a':2})

Altogether more versatile and coherent IMHO.

-- 
Arnaud


From martin.hellwig at dcuktec.org  Sun Mar  7 17:27:48 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Sun, 07 Mar 2010 22:27:48 +0000
Subject: killing own process in windows
In-Reply-To: <4b942094$0$25784$426a74cc@news.free.fr>
References: <4b9415d7$0$19558$426a74cc@news.free.fr>
	<hn15pd$3t7$1@news.eternal-september.org>
	<4b942094$0$25784$426a74cc@news.free.fr>
Message-ID: <hn1991$s2d$1@news.eternal-september.org>

On 03/07/10 21:54, News123 wrote:
> Hi Martin.
> Hellwig wrote:
>> On 03/07/10 21:08, News123 wrote:
>>> Hi,
>>>
>>>
>>> How can I kill my own process?
>>>
>>> Some multithreaded programs, that I have are unable to stop when ctrl-C
>>> is pressed.
>>> Some can't be stopped with sys.exit()
>>>
>>> So I'd just like to terminate my own program.
>>>
>>>
>>> Examples of non killable (not killable with CTRL-C) programs:
>>> - A program, that started an XMLRPC server with serve_forever
>>> - a program, that started a multiprocessing.Manager with serve_forever
>>>
>>>
>> If it is just the xml rpc server you want to kill, there might be better
>> ways. For example look at:
>> http://code.google.com/p/dcuktec/source/browse/source/wrapped_xmlrpc_server/rpc.py
>>
>> with perhaps special interest at the comment on lines 172-174.
> I
>
>
>
> Thanks. this looks like a good solution for an XMLRPC server.
> However when playing with different server modules I fall over and over
> again over code, that can't be shutdown nicely.
>
> Currently I'm still struggling with multiprocessing.managers,BaseManager
>
> bye
>
> N

I haven't used the multiprocessing module yet, but generally speaking I 
believe that everything in python that is server-like inherits from 
SocketServer BaseServer. Probably for you to have all servers behave in 
a way you expect, is to override functionality there, for example in:
http://docs.python.org/library/socketserver.html?highlight=baseserver#SocketServer.BaseServer
the function: handle_request

Though from looking at the source the function serve_forever is just an 
while loop over handle request (blocking or no-blocking), so might be a 
better candidate to replace.

But you still might find that some tcp connections remain open, so 
unless you want to go down to the socket level and explicit close the 
socket, there is not much you can do about that.

For the client side, socket timeout is you enemy, I found something 
rather long as default (300 seconds in the xml-rpc client) but yours 
might be different (it is probably a Python defined standard default, 
but I haven't checked that).

Sounds to me like you will be busy reading up on it now :-)

Oh and just a word to prevent over-engineering, if both the server and 
client is written by you, a lot of problems you anticipate will probably 
never occur because that would require a rogue server or client. Unless 
of course you like making rogue server/clients :-)

-- 
mph


From lists at cheimes.de  Sun Mar  7 17:36:54 2010
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 07 Mar 2010 23:36:54 +0100
Subject: killing own process in windows
In-Reply-To: <4b9415d7$0$19558$426a74cc@news.free.fr>
References: <4b9415d7$0$19558$426a74cc@news.free.fr>
Message-ID: <hn19q6$82n$1@dough.gmane.org>

News123 wrote:
> Hi,
> 
> 
> How can I kill my own process?
> 
> Some multithreaded programs, that I have are unable to stop when ctrl-C
> is pressed.
> Some can't be stopped with sys.exit()

You have to terminate the XMP-RPC server or the manager first. Check the
docs!

You can terminate a Python process with os._exit() but I recommend that
you find another way. os._exit() is a hard termination. It kills the
process without running any cleanup code like atexit handlers and
Python's internal cleanups. Open files aren't flushed to disk etc.

Christian



From news123 at free.fr  Sun Mar  7 18:01:39 2010
From: news123 at free.fr (News123)
Date: Mon, 08 Mar 2010 00:01:39 +0100
Subject: killing own process in windows
In-Reply-To: <mailman.438.1268001428.23598.python-list@python.org>
References: <4b9415d7$0$19558$426a74cc@news.free.fr>
	<mailman.438.1268001428.23598.python-list@python.org>
Message-ID: <4b943053$0$25136$426a74cc@news.free.fr>

Hi Cristian,

Christian Heimes wrote:
> News123 wrote:
>> Hi,
>>
>>
>> How can I kill my own process?
>>
>> Some multithreaded programs, that I have are unable to stop when ctrl-C
>> is pressed.
>> Some can't be stopped with sys.exit()
> 
> You have to terminate the XMP-RPC server or the manager first. Check the
> docs!
> 
> You can terminate a Python process with os._exit() but I recommend that
> you find another way. os._exit() is a hard termination. It kills the
> process without running any cleanup code like atexit handlers and
> Python's internal cleanups. Open files aren't flushed to disk etc.
> 

This is exactly the problem:
Neither the XMLRPC server nor the manager can be stopped
both serve forever. The doc doesn't really help.

For the XMLRPC server there are tricks to subclass it and to change the
behaviour, as indicated by Martin.

for the manager I did not find a clean solution (Plese see my other
thread "stopping a multiprocessing.manage.....")


I'm  surprised, that there are no 'canned' solution to stop servers
remotely or just by pressing ctrl-C
I consider this being quite useful for certain kinds of applications.

I prefer to ask a server to shutdown, than to just kill him.

Am interactive program, which also acts like a server should be able
to shutdown its server thread from the main thread  in order to quit nicely.


Baseserver has even a shutdown method(), but it cannot be called if
were started with serve_forever().

N







From googler.1.webmaster at spamgourmet.com  Sun Mar  7 18:29:42 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Sun, 7 Mar 2010 15:29:42 -0800 (PST)
Subject: time_struct
References: <23dbe409-60ed-4f6f-bd38-4336e4f1b3d0@f8g2000yqn.googlegroups.com>
Message-ID: <d89d75c5-2e65-4779-9122-c3a5e1d07e96@b7g2000yqd.googlegroups.com>

any ideas?


From rjngrj2010 at gmail.com  Sun Mar  7 18:33:16 2010
From: rjngrj2010 at gmail.com (gujax)
Date: Sun, 7 Mar 2010 15:33:16 -0800 (PST)
Subject: Window crash/freeze after "python test.py" in \Gnuplot
Message-ID: <3d586615-f79c-4657-bcaf-58287d5c8917@g11g2000yqe.googlegroups.com>

Hi,
My computer OS is Win ME, and I am running a Py2.5 version. Gnuplot is
v4.2, Gnuplot_py is v1.8. However, whenever I give a command "python
test.py" to test Gnuplot_py, I sometimes get message "
#Gnuplot.................for enjoyment
#press return to open a window
>..
>clear terminal
....#####test function#######
and then computer hangs. I never see any windows appearing. A blue
screen appears with request for cntrl-alt-del.

I cannot exactly determine the messages because the crash occurs
relatively fast therefore some sentences above may not be accurate.

I have tried this with many scripts which use Gnuplot for plotting but
it results in same crashes e.g. demo.py in gnuplot_py.
I really have no clue what should be my next step. Any help will be
appreicated.

I however, can run Gnuplot by typing "pgnuplot" or "wgnuplot" in the
command shell and it opens a Gnuplot window. Therefore, it looks like
some incompatibility between gnuplot_py, python2.5?
Thanks,
gujax


From floaiza2 at gmail.com  Sun Mar  7 18:55:14 2010
From: floaiza2 at gmail.com (floaiza)
Date: Sun, 7 Mar 2010 15:55:14 -0800 (PST)
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
Message-ID: <182de09d-417b-4ad7-8351-23a44e26fea6@15g2000yqi.googlegroups.com>

I don't think there is any doubt about the value of relational
databases, particularly on the Internet. The issue in my mind is how
to leverage all the information that resides in the "deep web" using
strictly the relational database paradigm.

Because that paradigm imposes a tight and rigid coupling between
semantics and syntax when you attempt to efficiently "merge" or
"federate" data from disparate sources you can find yourself spending
a lot of time and money building mappings and maintaining translators.

That's why approaches that try to separate syntax from the semantics
are now becoming so popular, but, again, as others have said, it is
not a matter of replacing one with the other, but of figuring out how
best to exploit what each technology offers.

I base my remarks on some initial explorations I have made on the use
of RDF Triple Stores, which, by the way, use RDBMSs to persist the
triples, but which offer a really high degree of flexibility WRT the
merging and federating of data from different semantic spaces.

The way I hope things will move forward is that eventually it will
become inexpensive and easy to "expose" as RDF triples all the
relevant data that now sits in special-purpose databases.

(just an opinion)

Francisco

On Mar 3, 12:36?pm, Xah Lee <xah... at gmail.com> wrote:
> recently i wrote a blog article on The NoSQL Movement
> athttp://xahlee.org/comp/nosql.html
>
> i'd like to post it somewhere public to solicit opinions, but in the
> 20 min or so, i couldn't find a proper newsgroup, nor private list
> that my somewhat anti-NoSQL Movement article is fitting.
>
> So, i thought i'd post here to solicit some opinins from the programer
> community i know.
>
> Here's the plain text version
>
> -----------------------------
> The NoSQL Movement
>
> Xah Lee, 2010-01-26
>
> In the past few years, there's new fashionable thinking about anti
> relational database, now blessed with a rhyming term: NoSQL.
> Basically, it considers that relational database is outdated, and not
> ?horizontally? scalable. I'm quite dubious of these claims.
>
> According to Wikipedia Scalability article, verticle scalability means
> adding more resource to a single node, such as more cpu, memory. (You
> can easily do this by running your db server on a more powerful
> machine.), and ?Horizontal scalability? means adding more machines.
> (and indeed, this is not simple with sql databases, but again, it is
> the same situation with any software, not just database. To add more
> machines to run one single software, the software must have some sort
> of grid computing infrastructure built-in. This is not a problem of
> the software per se, it is just the way things are. It is not a
> problem of databases.)
>
> I'm quite old fashioned when it comes to computer technology. In order
> to convience me of some revolutionary new-fangled technology, i must
> see improvement based on math foundation. I am a expert of SQL, and
> believe that relational database is pretty much the gist of database
> with respect to math. Sure, a tight definition of relations of your
> data may not be necessary for many applications that simply just need
> store and retrieve and modify data without much concern about the
> relations of them. But still, that's what relational database
> technology do too. You just don't worry about normalizing when you
> design your table schema.
>
> The NoSQL movement is really about scaling movement, about adding more
> machines, about some so-called ?cloud computing? and services with
> simple interfaces. (like so many fashionable movements in the
> computing industry, often they are not well defined.) It is not really
> about anti relation designs in your data. It's more about adding
> features for practical need such as providing easy-to-user APIs (so
> you users don't have to know SQL or Schemas), ability to add more
> nodes, provide commercial interface services to your database, provide
> parallel systems that access your data. Of course, these needs are all
> done by any big old relational database companies such as Oracle over
> the years as they constantly adopt the changing industry's needs and
> cheaper computing power. If you need any relations in your data, you
> can't escape relational database model. That is just the cold truth of
> math.
>
> Importat data, such as used in the bank transactions, has relations.
> You have to have tight relational definitions and assurance of data
> integrity.
>
> Here's a second hand quote from Microsoft's Technical Fellow David
> Campbell. Source
>
> ? ? I've been doing this database stuff for over 20 years and I
> ? ? remember hearing that the object databases were going to wipe out
> ? ? the SQL databases. And then a little less than 10 years ago the
> ? ? XML databases were going to wipe out.... We actually ... you
> ? ? know... people inside Microsoft, [have said] 'let's stop working
> ? ? on SQL Server, let's go build a native XML store because in five
> ? ? years it's all going....'
>
> LOL. That's exactly my thought.
>
> Though, i'd have to have some hands on experience with one of those
> new database services to see what it's all about.
>
> --------------------
> Amazon S3 and Dynamo
>
> Look at Structured storage. That seems to be what these nosql
> databases are. Most are just a key-value pair structure, or just
> storage of documents with no relations. I don't see how this differ
> from a sql database using one single table as schema.
>
> Amazon's Amazon S3 is another storage service, which uses Amazon's
> Dynamo (storage system), indicated by Wikipedia to be one of those
> NoSQL db. Looking at the S3 and Dynamo articles, it appears the db is
> just a Distributed hash table system, with added http access
> interface. So, basically, little or no relations. Again, i don't see
> how this is different from, say, MySQL with one single table of 2
> columns, added with distributed infrastructure. (distributed database
> is often a integrated feature of commercial dbs, e.g. Wikipedia Oracle
> database article cites Oracle Real Application Clusters )
>
> Here's a interesting quote on S3:
>
> ? ? Bucket names and keys are chosen so that objects are addressable
> ? ? using HTTP URLs:
>
> ? ? ? ? *http://s3.amazonaws.com/bucket/key
> ? ? ? ? *http://bucket.s3.amazonaws.com/key
> ? ? ? ? *http://bucket/key(where bucket is a DNS CNAME record
> pointing to bucket.s3.amazonaws.com)
>
> ? ? Because objects are accessible by unmodified HTTP clients, S3 can
> ? ? be used to replace significant existing (static) web hosting
> ? ? infrastructure.
>
> So this means, for example, i can store all my images in S3, and in my
> html document, the inline images are just normal img tags with normal
> urls. This applies to any other type of file, pdf, audio, but html
> too. So, S3 becomes the web host server as well as the file system.
>
> Here's Amazon's instruction on how to use it as image server. Seems
> quite simple: How to use Amazon S3 for hosting web pages and media
> files? Source
>
> --------------------
> Google BigTable
>
> Another is Google's BigTable. I can't make much comment. To make a
> sensible comment, one must have some experience of actually
> implementing a database. For example, a file system is a sort of
> database. If i created a scheme that allows me to access my data as
> files in NTFS that are distributed over hundreds of PC, communicated
> thru http running Apache. This will let me access my files. To insert,
> delete, data, one can have cgi scripts on each machine. Would this be
> considered as a new fantastic NoNoSQL?
>
> ---------------------
>
> comments can also be posted tohttp://xahlee.blogspot.com/2010/01/nosql-movement.html
>
> Thanks.
>
> ? Xah
> ?http://xahlee.org/
>
> ?



From moc.liamg at synabp.reverse_the_string  Sun Mar  7 19:18:13 2010
From: moc.liamg at synabp.reverse_the_string (=?UTF-8?B?UGF3ZcWCIEJhbnnFmw==?=)
Date: Mon, 08 Mar 2010 01:18:13 +0100
Subject: running a program on many processors
Message-ID: <hn1ft2$i5l$1@atlantis.news.neostrada.pl>

Hello,

I have already read about Python and multiprocessing which allows using
many processors. The idea is to split a program into separate tasks and
run each of them on a separate processor. However I want to run a Python
program doing a single simple task on many processors so that their
cumulative power is available to the program as if there was one huge
CPU instead of many separate ones. Is it possible? How can it be achieved?

Best regards,

Pawe?


From deets at nospam.web.de  Sun Mar  7 19:28:48 2010
From: deets at nospam.web.de (Diez B. Roggisch)
Date: Mon, 08 Mar 2010 01:28:48 +0100
Subject: running a program on many processors
In-Reply-To: <hn1ft2$i5l$1@atlantis.news.neostrada.pl>
References: <hn1ft2$i5l$1@atlantis.news.neostrada.pl>
Message-ID: <7vium2FgvmU1@mid.uni-berlin.de>

Am 08.03.10 01:18, schrieb Pawe? Bany?:
> Hello,
>
> I have already read about Python and multiprocessing which allows using
> many processors. The idea is to split a program into separate tasks and
> run each of them on a separate processor. However I want to run a Python
> program doing a single simple task on many processors so that their
> cumulative power is available to the program as if there was one huge
> CPU instead of many separate ones. Is it possible? How can it be achieved?


That's impossible to answer without knowing anything about your actual 
task. Not everything is parallelizable, or algorithms suffer from 
penalties if parallelization is overdone.

So in essence, what you've read already covers it: if your "simple task" 
is dividable in several, independent sub-tasks that don't need 
serialization, multiprocessing is your friend.

Diez


From g.bogle at auckland.no.spam.ac.nz  Sun Mar  7 19:49:07 2010
From: g.bogle at auckland.no.spam.ac.nz (Gib Bogle)
Date: Mon, 08 Mar 2010 13:49:07 +1300
Subject: running a program on many processors
References: <hn1ft2$i5l$1@atlantis.news.neostrada.pl>
Message-ID: <hn1hi3$9hi$3@speranza.aioe.org>

Pawe? Bany? wrote:
...
How can it be achieved?

Very carefully.


From steve at REMOVE-THIS-cybersource.com.au  Sun Mar  7 20:08:32 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 08 Mar 2010 01:08:32 GMT
Subject: running a program on many processors
References: <hn1ft2$i5l$1@atlantis.news.neostrada.pl>
Message-ID: <4b944e10$0$8836$c3e8da3@news.astraweb.com>

On Mon, 08 Mar 2010 01:18:13 +0100, Pawe? Bany? wrote:

> Hello,
> 
> I have already read about Python and multiprocessing which allows using
> many processors. The idea is to split a program into separate tasks and
> run each of them on a separate processor. However I want to run a Python
> program doing a single simple task on many processors so that their
> cumulative power is available to the program as if there was one huge
> CPU instead of many separate ones. Is it possible? How can it be
> achieved?

Try Parallel Python.

http://www.parallelpython.com/

I haven't used it, but it looks interesting.

However, the obligatory warning against premature optimization: any sort 
of parallel execution (including even lightweight threads) is hard to 
build and much harder to debug. You should make sure that the potential 
performance benefits are worth the pain before you embark on the job: are 
you sure that the naive, single process version isn't fast enough?


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sun Mar  7 20:14:43 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 08 Mar 2010 01:14:43 GMT
Subject: best practices: is collections.defaultdict my friend or not?
References: <dcb4cac6-f56e-49db-a679-5a7657997230@q2g2000pre.googlegroups.com>
	<20100306031003.1018aab2@geekmail.INVALID>
	<3ae40c74-7bee-4c6c-9ed2-7a73675f8040@v20g2000prb.googlegroups.com>
	<mailman.421.1267954386.23598.python-list@python.org>
Message-ID: <4b944f83$0$8836$c3e8da3@news.astraweb.com>

On Sun, 07 Mar 2010 09:33:22 +0000, Mark Lawrence wrote:

>> I was a little frightened of doing "import this" ("Hey, kid, run rm -
>> rf / and see what happens!"), but did, and the words are wise.
>> 
>> Pete
> 
> After reading the words of wisdom try "import this" a second time and
> watch what happens, it's quite interesting if you're not expecting the
> output.

<raises eyebrow>

You weren't expecting to get the Python prompt?


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sun Mar  7 20:46:28 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 08 Mar 2010 01:46:28 GMT
Subject: negative "counts" in collections.Counter?
References: <mailman.437.1267995887.23598.python-list@python.org>
	<m2eijv4vtk.fsf@googlemail.com>
Message-ID: <4b9456f4$0$8836$c3e8da3@news.astraweb.com>

On Sun, 07 Mar 2010 22:21:27 +0000, Arnaud Delobelle wrote:

> Vlastimil Brom <vlastimil.brom at gmail.com> writes:
> 
>> Hi all,
>> I'd like to ask about the possibility of negative "counts" in
>> collections.Counter (using Python 3.1); I believe, my usecase is rather
>> trivial, basically I have the word frequencies of two texts and I want
>> do compare them (e.g. to see what was added and removed between
>> different versions of a text).

[...]

> Every time I have needed something like collections.Counter, I have
> wanted the behaviour you require too.  As a result, I have never used
> collections.Counter.  Instead I have used plain dictionaries or my own
> class.

Vlastimil and Arnaud,

It looks like Counter already has negative counts in Python 3.1:

>>> import collections
>>> c = collections.Counter({'red': 2, 'green': 0, 'blue': -5})
>>> c['blue'] -= 1
>>> c
Counter({'red': 2, 'green': 0, 'blue': -6})
>>> c['blue'] += 1
>>> c
Counter({'red': 2, 'green': 0, 'blue': -5})

But the + and - operators destroy negative and zero counts:

>>> c + collections.Counter({'blue': 1})
Counter({'red': 2})

I can't imagine what the use-case for that behaviour is.

Given that Counter supports negative counts, it looks to me that the 
behaviour of __add__ and __sub__ is fundamentally flawed. You should 
raise a bug report (feature enhancement) on the bug tracker.

http://bugs.python.org/

Given that this will change the documented behaviour, it will help if you 
give a short, simple idiom for removing zero and negative elements, 
Arnaud's trick with | Counter().

When you raise the report, please post an update here.



-- 
Steven


From gagsl-py2 at yahoo.com.ar  Sun Mar  7 21:00:41 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sun, 07 Mar 2010 23:00:41 -0300
Subject: A "scopeguard" for Python
References: <hmlu55$n1s$1@news.eternal-september.org>
	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>
	<hmm0rd$a48$1@news.eternal-september.org>
	<mailman.211.1267636174.23598.python-list@python.org>
	<hmm5ln$arg$1@news.eternal-september.org>
	<mailman.221.1267642316.23598.python-list@python.org>
	<hmmdgd$17s$1@news.eternal-september.org>
	<mailman.241.1267650180.23598.python-list@python.org>
	<hmmkmh$mt1$1@news.eternal-september.org>
	<mailman.260.1267658935.23598.python-list@python.org>
	<hmn03d$5r6$1@news.eternal-september.org>
	<mailman.292.1267717742.23598.python-list@python.org>
	<hmooo6$pg0$1@news.eternal-september.org>
	<mailman.300.1267723245.23598.python-list@python.org>
	<hmoul7$2i9$1@news.eternal-september.org>
	<mailman.314.1267744631.23598.python-list@python.org>
	<hmph3b$20o$1@news.eternal-september.org>
Message-ID: <op.u877vfs4x6zn5v@gabriel.sleipnir-bsas>

En Thu, 04 Mar 2010 20:52:04 -0300, Alf P. Steinbach <alfps at start.no>  
escribi?:

> Sorry, as with the places noted above, I can't understand what you're  
> trying to say here.

Regarding your posts, neither can I. All the time. Sorry, deciphering your  
posts would force me to spend much more time than available and I can't  
afford that - so I'm blocking your messages from now on.

-- 
Gabriel Genellina



From martin.hellwig at dcuktec.org  Sun Mar  7 21:08:39 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Mon, 08 Mar 2010 02:08:39 +0000
Subject: running a program on many processors
In-Reply-To: <hn1ft2$i5l$1@atlantis.news.neostrada.pl>
References: <hn1ft2$i5l$1@atlantis.news.neostrada.pl>
Message-ID: <hn1m73$9g7$1@news.eternal-september.org>

On 03/08/10 00:18, Pawe? Bany? wrote:
> Hello,
>
> I have already read about Python and multiprocessing which allows using
> many processors. The idea is to split a program into separate tasks and
> run each of them on a separate processor. However I want to run a Python
> program doing a single simple task on many processors so that their
> cumulative power is available to the program as if there was one huge
> CPU instead of many separate ones. Is it possible? How can it be achieved?
>
> Best regards,
>
> Pawe?

As far as I know, the Python VM (cpython) will not analyze your code and 
automatically spread parts over different processing units.

I did read, two years or so ago, that AMD was looking in to something 
that does just what you say on a cpu level, that is present itself as 
one logical cpu but underneath there are multiple physical ones. I 
wouldn't hold my breath though waiting for it.

-- 
mph


From monkey at joemoney.net  Sun Mar  7 21:10:00 2010
From: monkey at joemoney.net (monkeys paw)
Date: Sun, 07 Mar 2010 21:10:00 -0500
Subject: write to remote ile
Message-ID: <WpqdnTgN4vzhwQnWnZ2dnUVZ_tOdnZ2d@insightbb.com>

I can xfer a file from a remote server using:

import urllib2 as u
x=u.urlopen('http://tycho.usno.navy.mil/cgi-bin/timer.pl')

for line in x:
     print line


How can i write a file to the remote server?

I tried:

x = u.url.open('http://joemoney.net/somefile.txt', 'w')

but that does not work


From martin.hellwig at dcuktec.org  Sun Mar  7 21:20:20 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Mon, 08 Mar 2010 02:20:20 +0000
Subject: write to remote ile
In-Reply-To: <WpqdnTgN4vzhwQnWnZ2dnUVZ_tOdnZ2d@insightbb.com>
References: <WpqdnTgN4vzhwQnWnZ2dnUVZ_tOdnZ2d@insightbb.com>
Message-ID: <hn1msv$95d$1@news.eternal-september.org>

On 03/08/10 02:10, monkeys paw wrote:
> I can xfer a file from a remote server using:
>
> import urllib2 as u
> x=u.urlopen('http://tycho.usno.navy.mil/cgi-bin/timer.pl')
>
> for line in x:
> print line
>
>
> How can i write a file to the remote server?
>
> I tried:
>
> x = u.url.open('http://joemoney.net/somefile.txt', 'w')
>
> but that does not work

How do you normally (i.e. without python) put files on a remote server?

-- 
mph


From jmheralds at gmail.com  Sun Mar  7 21:32:08 2010
From: jmheralds at gmail.com (James Heralds)
Date: Sun, 7 Mar 2010 18:32:08 -0800 (PST)
Subject: Call for papers: SETP-10, USA, July 2010
Message-ID: <84762688-eaf6-4e4e-a903-791e7e2bc2c7@j27g2000yqn.googlegroups.com>

It would be highly appreciated if you could share this announcement
with your colleagues, students and individuals whose research is in
software engineering, software testing, software quality assurance,
software design and related areas.

Call for papers: SETP-10, USA, July 2010

The 2010 International Conference on Software Engineering Theory and
Practice (SETP-10) (website: http://www.PromoteResearch.org ) will be
held during 12-14 of July 2010 in Orlando, FL, USA.  SETP is an
important event in the areas of Software development, maintenance, and
other areas of software engineering and related topics.

The conference will be held at the same time and location where
several other major international conferences will be taking place.
The conference will be held as part of 2010 multi-conference
(MULTICONF-10). MULTICONF-10 will be held during July 12-14, 2010 in
Orlando, Florida, USA. The primary goal of MULTICONF is to promote
research and developmental activities in computer science, information
technology, control engineering, and related fields. Another goal is
to promote the dissemination of research to a multidisciplinary
audience and to facilitate communication among researchers,
developers, practitioners in different fields. The following
conferences are planned to be organized as part of MULTICONF-10.

?	International Conference on Artificial Intelligence and Pattern
Recognition (AIPR-10)
?	 International Conference on Automation, Robotics and Control
Systems (ARCS-10)
?	International Conference on Bioinformatics, Computational Biology,
Genomics and Chemoinformatics (BCBGC-10)
?	International Conference on Computer Communications and Networks
(CCN-10)
?	International Conference on Enterprise Information Systems and Web
Technologies (EISWT-10)
?	International Conference on High Performance Computing Systems
(HPCS-10)
?	International Conference on Information Security and Privacy
(ISP-10)
?	International Conference on Image and Video Processing and Computer
Vision (IVPCV-10)
?	International Conference on Software Engineering Theory and Practice
(SETP-10)
?	International Conference on Theoretical and Mathematical Foundations
of Computer Science (TMFCS-10)

MULTICONF-10 will be held at Imperial Swan Hotel and Suites.  It is a
full-service resort that puts you in the middle of the fun! Located
1/2 block south of the famed International Drive, the hotel is just
minutes from great entertainment like Walt Disney World? Resort,
Universal Studios and Sea World Orlando. Guests can enjoy free
scheduled transportation to these theme parks, as well as spacious
accommodations, outdoor pools and on-site dining ? all situated on 10
tropically landscaped acres. Here, guests can experience a full-
service resort with discount hotel pricing in Orlando.


We invite draft paper submissions. Please see the website
http://www.PromoteResearch.org  for more details.

Sincerely
James Heralds


From python at bdurham.com  Sun Mar  7 21:41:30 2010
From: python at bdurham.com (python at bdurham.com)
Date: Sun, 07 Mar 2010 21:41:30 -0500
Subject: Best practice way to detect internet connectivity under Python
	2.6/Windows
Message-ID: <1268016090.13219.1363604225@webmail.messagingengine.com>

Is the best pratice way to detect internet connectivity under
Windows (using Python 2.6) simply to attempt to access a known
internet website using urllib or urlib2 wrapped in a try/except
construct?

Thank you,
Malcolm
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From monkey at joemoney.net  Sun Mar  7 21:51:22 2010
From: monkey at joemoney.net (monkeys paw)
Date: Sun, 07 Mar 2010 21:51:22 -0500
Subject: write to remote ile
In-Reply-To: <hn1msv$95d$1@news.eternal-september.org>
References: <WpqdnTgN4vzhwQnWnZ2dnUVZ_tOdnZ2d@insightbb.com>
	<hn1msv$95d$1@news.eternal-september.org>
Message-ID: <f--dnSFN38yw-wnWnZ2dnUVZ_gadnZ2d@insightbb.com>

On 3/7/2010 9:20 PM, Martin P. Hellwig wrote:
> On 03/08/10 02:10, monkeys paw wrote:
>> I can xfer a file from a remote server using:
>>
>> import urllib2 as u
>> x=u.urlopen('http://tycho.usno.navy.mil/cgi-bin/timer.pl')
>>
>> for line in x:
>> print line
>>
>>
>> How can i write a file to the remote server?
>>
>> I tried:
>>
>> x = u.url.open('http://joemoney.net/somefile.txt', 'w')
>>
>> but that does not work
>
> How do you normally (i.e. without python) put files on a remote server?
>
Using FTP, i'm really having a brain cramp here, but i'm new to python


From martin.hellwig at dcuktec.org  Sun Mar  7 21:53:46 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Mon, 08 Mar 2010 02:53:46 +0000
Subject: write to remote ile
In-Reply-To: <f--dnSFN38yw-wnWnZ2dnUVZ_gadnZ2d@insightbb.com>
References: <WpqdnTgN4vzhwQnWnZ2dnUVZ_tOdnZ2d@insightbb.com>
	<hn1msv$95d$1@news.eternal-september.org>
	<f--dnSFN38yw-wnWnZ2dnUVZ_gadnZ2d@insightbb.com>
Message-ID: <hn1ork$edf$1@news.eternal-september.org>

On 03/08/10 02:51, monkeys paw wrote:
> On 3/7/2010 9:20 PM, Martin P. Hellwig wrote:
>> On 03/08/10 02:10, monkeys paw wrote:
>>> I can xfer a file from a remote server using:
>>>
>>> import urllib2 as u
>>> x=u.urlopen('http://tycho.usno.navy.mil/cgi-bin/timer.pl')
>>>
>>> for line in x:
>>> print line
>>>
>>>
>>> How can i write a file to the remote server?
>>>
>>> I tried:
>>>
>>> x = u.url.open('http://joemoney.net/somefile.txt', 'w')
>>>
>>> but that does not work
>>
>> How do you normally (i.e. without python) put files on a remote server?
>>
> Using FTP, i'm really having a brain cramp here, but i'm new to python

We all been there, in some for or other ;-), anyway you might want to 
have a look at this:
http://docs.python.org/library/ftplib.html

-- 
mph


From missive at hotmail.com  Sun Mar  7 22:01:02 2010
From: missive at hotmail.com (Lee Harr)
Date: Mon, 8 Mar 2010 07:31:02 +0430
Subject: [ANNC] pynguin-0.2 (python turtle graphics application)
Message-ID: <SNT106-W23D8598384B1310649531FB1350@phx.gbl>


Pynguin is a python-based turtle graphics application.
??? It combines an editor, interactive interpreter, and
??? graphics display area.

It is meant to be an easy environment for introducing
??? some programming concepts to beginning programmers.


http://pynguin.googlecode.com/


This release continues adding basic functionality and
??? corrects some annoyances. If you are interested,
??? please take a look and let me know what you think.


Pynguin is tested with Python 2.6.4 and uses PyQt (4.6)
??? for its GUI elements. Pynguin is released under GPLv3.


Changes in pynguin-0.2:
??? - added fill mode
??? - added basic auto-indent in editor
??? - added quick links to recent documents
??? - added quick links to example files
??? - even out speeds when drawing short line segments
??? - added animated circle drawing
??? - now exports entire drawing, even if not visible on screen
??? - fixed initial drawing speed to match menu
??? - fixed-width fonts in editor and interactive interpreter
??? - added classic turtle image
??? - file browser now starts in user's home directory
??? - removed scrollbars on graphic view
??? - now extends lines when animating

 		 	   		  
_________________________________________________________________
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From greg.ewing at canterbury.ac.nz  Sun Mar  7 22:09:12 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Mon, 08 Mar 2010 16:09:12 +1300
Subject: Reverse engineering CRC?
Message-ID: <7vj7fdFnnjU1@mid.individual.net>

Given some known data/crc pairs, how feasible is it to
figure out the polynomial being used to generate the crc?

In the case I'm looking at, it appears that the crc
size may be at least 24 bits, so just trying all possible
polynomials probably isn't doable.

An article I found hints at the possibility of using
GCDs to make the search more efficient, but doesn't go
into any details. Anyone know of any literature about
this?

If it helps, I have the ability to generate test cases
with known message contents to some extent, although
I don't have complete control over the contents. Also
it's a manual process, so generating large numbers of
them automatically isn't an option.

-- 
Greg


From python at bdurham.com  Sun Mar  7 22:09:44 2010
From: python at bdurham.com (python at bdurham.com)
Date: Sun, 07 Mar 2010 22:09:44 -0500
Subject: IMAP mail filters tool
In-Reply-To: <4B9097A6.2050600@seehart.com>
References: <4B9097A6.2050600@seehart.com>
Message-ID: <1268017784.16962.1363607281@webmail.messagingengine.com>

Ken,

Check out Zed Shaw's very cool Lamson project.
http://lamsonproject.org/

Malcolm

----- Original message -----
From: "Ken Seehart" <ken at seehart.com>
To: python-list at python.org
Date: Thu, 04 Mar 2010 21:33:26 -0800
Subject: IMAP mail filters tool
I'm thinking of possibly making a simple client-agnostic tool for
filtering and processing IMAP email.  I'm a Thunderbird user, but
I'm interested in a tool that is not client software specific.
So I am is checking for prior art.  Does anyone know of a filter
tool with most of these features?
  * Written and customizable with python
  * IMAP based
  * Runs on client (i.e. without installing anything on the
    server)
  * Runs completely independent of client software (though could
    be launched from any email client that can support it)
  * Automatically suggests new rules based on manual movement of
    emails into folders (based on comparison of all header data
    across all existing folders)
  * Take arbitrary actions in response to rules (e.g. universally
    denying access to spam senders to all online cheese shops)
  * Capable of serving as a prototyping framework for things like
    spam filtering
  * General filtering functionality, not particularly focused on
    spam
  * Posts and updates rules to server via IMAP (i.e. by sending
    and automagically processing a special email message).

Typical work-flow would be aimed at users who like to
automatically sort their email prior to reading it.  The goal is
to have nearly all email sorted into folders so that most mail
remaining in the Inbox is likely to be leftover spam missed by
whatever spam filters are being used.  In other words, the
filters tend to effectively serve as white lists.
Examples of unusual rules that don't seem to be supported by most
email clients:
  * When you send an email, add the recipient to a filter such
    that email from that recipient goes to a "Unfiltered Replies"
    folder if it does not match any other filter.
  * Receiving email with certain fields matching certain regular
    expressions could automatically create a new folder and
    filter e.g.:
       + List-Id: "SF Bay Area Python group
         <baypiggies.python.org>" yields a new folder "Lists/SF
         Bay Area Python group" with a corresponding rule
       + X-Launchpad-Bug: "product=phatch; milestone=..." yields
         a new folder "Bugs/Phatch" with a corresponding rule
       + X-Bugzilla-Product: "Shrubbery" yields a new folder
         "Bugs/Shrubbery" with a corresponding rule

Thanks,
Ken
--
http://mail.python.org/mailman/listinfo/python-list
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From steve at REMOVE-THIS-cybersource.com.au  Sun Mar  7 22:41:35 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 08 Mar 2010 03:41:35 GMT
Subject: Reverse engineering CRC?
References: <7vj7fdFnnjU1@mid.individual.net>
Message-ID: <4b9471ee$0$8836$c3e8da3@news.astraweb.com>

On Mon, 08 Mar 2010 16:09:12 +1300, Gregory Ewing wrote:

> Given some known data/crc pairs, how feasible is it to figure out the
> polynomial being used to generate the crc?

Can you just ask the application developer what CRC is being used? Or 
look at the source code? Disassemble the binary?


> In the case I'm looking at, it appears that the crc size may be at least
> 24 bits, so just trying all possible polynomials probably isn't doable.

"At least"? Can't you tell by looking at them?

A good place to start is here:

http://en.wikipedia.org/wiki/Cyclic_redundancy_check
http://en.wikipedia.org/wiki/List_of_checksum_algorithms

You can at least eliminate known CRCs. There doesn't appear to be any 24-
bit CRCs in common use, and very few other 24-bit checksums either, so 
you're probably looking at a custom CRC.

 
> An article I found hints at the possibility of using GCDs to make the
> search more efficient, but doesn't go into any details. Anyone know of
> any literature about this?

If you're reduced to trying to determine the polynomial from a sample of 
checksums, that's a curve fitting problem. There are various ways to fit 
polynomials through a set of known points, but as far as I know none of 
them are designed for reverse-engineering CRCs.

You may be able to find something about curve-fitting using discrete 
maths (i.e. where all values are limited to integers) or with constraints.

You should probably take this to somewhere like sci.crypt. Here's a 
thread from a few years back which might give you some hints:

http://www.derkeiler.com/Newsgroups/sci.crypt/2008-07/msg00035.html

Or here:

http://stackoverflow.com/questions/401231/determining-crc-algorithm-from-
data-crc-embedded-application


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sun Mar  7 22:44:24 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 08 Mar 2010 03:44:24 GMT
Subject: Reverse engineering CRC?
References: <7vj7fdFnnjU1@mid.individual.net>
Message-ID: <4b947298$0$8836$c3e8da3@news.astraweb.com>

On Mon, 08 Mar 2010 16:09:12 +1300, Gregory Ewing wrote:

> Given some known data/crc pairs, how feasible is it to figure out the
> polynomial being used to generate the crc?

Google is your friend:

http://www.woodmann.com/fravia/crctut1.htm



-- 
Steven


From satishgroups1 at gmail.com  Sun Mar  7 23:43:09 2010
From: satishgroups1 at gmail.com (satish groups)
Date: Sun, 7 Mar 2010 20:43:09 -0800 (PST)
Subject: Evaluating Income Property
Message-ID: <3b8d2ac9-5e77-4910-9774-203cf1c6cd29@s25g2000prd.googlegroups.com>

Income property is becoming more attractive to investors looking for a
better return on their money. With today's low interest rates, income-
producing properties such as apartments and duplexes can produce
exciting returns. As with any type of property, the value of income
property is what someone is willing to pay for it. But, the main
determinant of value for income property is the net income it will
produce.

As we'll see later, the income approach should closely correlate with
the market value under normal market conditions. Buyers of residential
income property will want to know the answers to several questions not
normally asked by home buyers. First, what is the amount of cash flow
the property will generate? Second, how much actual net income will it
produce? Third, are the tax benefits that the property will provide
the investor? Cash flow can be described as the amount of money
collected as rental income each month.

http://greatincomeproperties.com/


From dr.cg at 126.com  Mon Mar  8 00:08:56 2010
From: dr.cg at 126.com (CHEN Guang)
Date: Mon, 8 Mar 2010 13:08:56 +0800 (CST)
Subject: The C language like the Python, by the Python and for the Python
	--- PythoidC
Message-ID: <1f91f2e.86f9.1273c2d0993.Coremail.dr.cg@126.com>

Hi, if you are interested in C-Python mixed programming, please take a look at:
http://pythoidc.googlecode.com
PythoidC is the C language like the Python, by the Python and for the Python
 
import c
c.include(c.h.stdio) 
c.include(c.h.stdlib) 
'''Annotation is free!''' 
int fib(int n): 
    if(n<=2): 
        return1 
    else: 
        return fib(n-1)+ fib(n-2) 
int main(int argc,char**argv): 
    int n //C style annotation 
    n=c.stdlib.atoi(argv[1]) 
    c.stdio.printf('fibonacci(%d)=%d\n', n, fib(n))
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From python at rcn.com  Mon Mar  8 01:31:00 2010
From: python at rcn.com (Raymond Hettinger)
Date: Sun, 7 Mar 2010 22:31:00 -0800 (PST)
Subject: negative "counts" in collections.Counter?
References: <mailman.437.1267995887.23598.python-list@python.org> 
	<m2eijv4vtk.fsf@googlemail.com>
	<4b9456f4$0$8836$c3e8da3@news.astraweb.com>
Message-ID: <e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com>

On Mar 7, 5:46?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> Given that Counter supports negative counts, it looks to me that the
> behaviour of __add__ and __sub__ is fundamentally flawed. You should
> raise a bug report (feature enhancement) on the bug tracker.

It isn't a bug.  I designed it that way.
There were several possible design choices,
each benefitting different use cases.

FWIW, here is the reasoning behind the design.

The basic approach to Counter() is to be a dict subclass
that supplies zero for missing values.   This approach
places almost no restrictions on what can be stored in it.
You can store floats, decimals, fractions, etc.
Numbers can be positive, negative, or zero.

This design leaves users with a good deal of flexibility,
but more importantly it keeps the API very close to
regular dictionaries (thus lowering the learning curve).
It also makes basic counter operations very fast.

The update() method differs from regular dictionaries
because dict.update() isn't very helpful in a counter context.
Instead, it allows one counter to update another.  Like
the other basic counter operations, it places no restrictions
on type (i.e.  it works on with ints, floats, decimals, fractions,
etc).
or on sign (positive, negative, or zero).  The only requirement
is that the values support addition.

The basic API also adds some convenience methods.
The most_common() method tries to not be restrictive.
It only requires the count values be orderable.

For obvious reasons, the elements() method *does* have
restrictions and won't work with float values and won't
emit entries with non-positive counts.

Beyond the basic API listed above which is straight-forward,
the area where there were more interesting design choices
were the Counter-to-Counter operations (__add__, __sub__,
__or__, and __and__).

One possible choice (the one preferred by the OP) was to
has addition and subtraction be straight adds and subtracts
without respect to sign and to not support __and__ and __or__.
Straight addition was already supported via the update() method.
But no direct support was provided for straight subtractions
that leave negative values.  Sorry about that.

Instead the choice was to implement the four methods as
multiset operations.  As such, they need to correspond
to regular set operations.  For example, with sets:

   set('abc') - set('cde')    # gives set('ab')

Notice how subtracting 'e' did not produce a negative result?
Now with multisets, we want the same result:

   Counter({'a':1, 'b':1, 'c':1'}) - Counter({'c':1, 'd':1, 'e':1})

So the design decision was to support multiset operations
that produces only results with positive counts.

These multiset-style mathematical operations are discussed in:
Knuth's TAOCP Volume II section 4.6.3 exercise 19
and at http://en.wikipedia.org/wiki/Multiset .
Also C++ has multisets that support only positive counts.

So, there you have it.  There design tries to be as
unrestrictive as possible.  When a choice had to be
made, it favored multisets over behaviors supporting
negative values.

Fortunately, it is trivially easy to extend the class
to add any behavior you want.

class MyCounter(Counter):
   def __sub__(self, other):
      result = self.copy()
      for elem, cnt in other.items():
          result[elem] -= cnt

Hopes this gives you some insight into the design choices.


Raymond Hettinger



From stefan_ml at behnel.de  Mon Mar  8 02:08:35 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Mon, 08 Mar 2010 08:08:35 +0100
Subject: The C language like the Python, by the Python and for the Python
	--- PythoidC
In-Reply-To: <1f91f2e.86f9.1273c2d0993.Coremail.dr.cg@126.com>
References: <1f91f2e.86f9.1273c2d0993.Coremail.dr.cg@126.com>
Message-ID: <hn27pj$cen$1@dough.gmane.org>

CHEN Guang, 08.03.2010 06:08:
> Hi, if you are interested in C-Python mixed programming, please take a look at:
> http://pythoidc.googlecode.com
> PythoidC is the C language like the Python, by the Python and for the Python

It looks a bit dangerous to me to parse C header files only with regular 
expressions. For Cython, some people seem to be using gcc-xml instead, and 
some have reported that clang is really nice to play with. However, none of 
those has made its way into Cython yet, mostly due to the dependency it 
would add. I don't know if tcc (which you seem to depend on) has anything 
comparable, but I doubt it.

Just out of curiosity, is this syntax converter actually used for any real 
projects?

Stefan



From miraclesoul at hotmail.com  Mon Mar  8 02:15:18 2010
From: miraclesoul at hotmail.com (Fahad Ahmad)
Date: Mon, 8 Mar 2010 07:15:18 +0000
Subject: Calculating very large exponents in python
In-Reply-To: <f3cc57c61003071240x18b580bend946824ef7955b6c@mail.gmail.com>
References: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>,
	<f3cc57c61003071240x18b580bend946824ef7955b6c@mail.gmail.com>
Message-ID: <COL110-W1236CED756D3C9374CB0A2B7350@phx.gbl>


Thanks Geremy,

That has been an absolute bump........... GOD i cant sit on my chair, it has worked even on 512 bit number and with no time..........
superb i would say.

lastly, i am using the code below to calculate Largest Prime factor of a number:

print ('''==============================================================================='''
       '''              CALCULATE  HIGHEST PRIME FACTOR                                  '''
       '''===============================================================================''')

#!/usr/bin/env python
def highest_prime_factor(n):
   if isprime(n):
      return n
   for x in xrange(2,n ** 0.5 + 1):
      if not n % x:
         return highest_prime_factor(n/x)
def isprime(n):
   for x in xrange(2,n ** 0.5 + 1):
      if not n % x:
         return False
   return True
if  __name__ == "__main__":
   import time
   start = time.time()
   print highest_prime_factor(1238162376372637826)
   print time.time() - start

the code works with a bit of delay on the number : "1238162376372637826" but extending it to (109026109913291424366305511581086089650628117463925776754560048454991130443047109026109913291424366305511581086089650628117463925776754560048454991130443047)
 makes python go crazy. Is there any way just like above, i can have it calculated it in no time.


thanks for the support.




> Date: Sun, 7 Mar 2010 15:40:59 -0500
> Subject: Re: Calculating very large exponents in python
> From: debatem1 at gmail.com
> To: miraclesoul at hotmail.com
> CC: python-list at python.org
> 
> On Sun, Mar 7, 2010 at 1:55 PM, Fahad Ahmad <miraclesoul at hotmail.com> wrote:
> > Dear All,
> >
> > i am writing my crytographic scheme in python, i am just a new user to it.
> > I have written the complete code, the only point i am stuck it is that i am
> > using 256 exponentiation which is normal in crytography but python just
> > hangs on it.
> >
> > g**x  [where both g and x are 256 bit numbers , in decimal they are around
> > 77]
> >
> > after reading several forums, i just come to know it can be done using
> > numpy, i have installed python(x,y) has has both numpy and scipy installed
> > but i am not able to make it happen.
> >
> > any idea which library, module, or piece of code can solve this mystery :S
> >
> > sorry for bad english
> 
> A couple of things:
> 
> 1) if you're working with modular exponentiation, remember that pow() takes
> three arguments, ie:
> 
> a = 222222222222222222222222222
> b = 5555555555555555555555555555
> pow(a, b, 1200)
> 
> will calculate the correct answer (768) very quickly, while
> 
> a**b % 1200
> 
> has not terminated in the time it took me to compose this
> email.
> 
> 2) sage has a lot of excellent tools for crypto/cryptanalysis that you
> may want to take a look at.
> 
> 3) not saying you don't know what you're doing, but be careful when
> rolling your own cryptosystems- even very good cryptographers make
> implementation mistakes!
> 
> Geremy Condra
 		 	   		  
_________________________________________________________________
Hotmail: Powerful Free email with security by Microsoft.
http://clk.atdmt.com/GBL/go/201469230/direct/01/
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From alfps at start.no  Mon Mar  8 02:38:55 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Mon, 08 Mar 2010 08:38:55 +0100
Subject: A "scopeguard" for Python
In-Reply-To: <mailman.439.1268013689.23598.python-list@python.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>	<hmn03d$5r6$1@news.eternal-september.org>	<mailman.292.1267717742.23598.python-list@python.org>	<hmooo6$pg0$1@news.eternal-september.org>	<mailman.300.1267723245.23598.python-list@python.org>	<hmoul7$2i9$1@news.eternal-september.org>	<mailman.314.1267744631.23598.python-list@python.org>	<hmph3b$20o$1@news.eternal-september.org>
	<mailman.439.1268013689.23598.python-list@python.org>
Message-ID: <hn29il$sbv$1@news.eternal-september.org>

* Gabriel Genellina:
> En Thu, 04 Mar 2010 20:52:04 -0300, Alf P. Steinbach <alfps at start.no> 
> escribi?:
> 
>> Sorry, as with the places noted above, I can't understand what you're 
>> trying to say here.
> 
> Regarding your posts, neither can I. All the time. Sorry, deciphering 
> your posts would force me to spend much more time than available and I 
> can't afford that - so I'm blocking your messages from now on.


You could just ask if there was anything you didn't understand.

Even with as little you quote readers can see my approach to that problem: asking.

But your response, both the out of context quoting and your comment, seems 
solely designed to convey a negative impression instead of addressing any 
technical issue.


Cheers,

- Alf


From stefan_ml at behnel.de  Mon Mar  8 02:42:38 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Mon, 08 Mar 2010 08:42:38 +0100
Subject: running a program on many processors
In-Reply-To: <hn1m73$9g7$1@news.eternal-september.org>
References: <hn1ft2$i5l$1@atlantis.news.neostrada.pl>
	<hn1m73$9g7$1@news.eternal-september.org>
Message-ID: <hn29pe$h67$1@dough.gmane.org>

Martin P. Hellwig, 08.03.2010 03:08:
> I did read, two years or so ago, that AMD was looking in to something
> that does just what you say on a cpu level, that is present itself as
> one logical cpu but underneath there are multiple physical ones. I
> wouldn't hold my breath though waiting for it.

Many (desktop/server) CPUs actually do the opposite today - they present 
themselves as one physical CPU per core with more than one (commonly two) 
logical CPUs. This was introduced because modern CPUs have so many 
independent parts (integer arithmetic, floating point, SSE, memory access) 
that it's hard to keep all of them busy with a single process (which 
usually does either integer arithmetic *or* floating point, for example, 
rarely both in parallel). With multiple processes running on the same core, 
it becomes a lot easier to find independent operations that can be sent to 
different parts of the core in parallel.

Automatically splitting single-threaded code over multiple cores is 
something that compilers (that see the full source code) should be able to 
do a lot better than hardware (which only sees a couple of basic operations 
at a time).

http://en.wikipedia.org/wiki/Vectorization_%28computer_science%29

Expecting this to work for an interpreted Python program is somewhat 
unrealistic, IMHO. If you need data parallel execution, use something like 
map-reduce or Copperhead instead of relying on the CPU to figure out what's 
happening inside of a virtual machine.

http://fperez.org/py4science/ucb/talks/20091118_copperhead_bcatanzaro.pdf

Stefan



From taskinoor.hasan at csebuet.org  Mon Mar  8 02:48:00 2010
From: taskinoor.hasan at csebuet.org (Taskinoor Hasan)
Date: Mon, 8 Mar 2010 13:48:00 +0600
Subject: Calculating very large exponents in python
In-Reply-To: <COL110-W1236CED756D3C9374CB0A2B7350@phx.gbl>
References: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>
	<f3cc57c61003071240x18b580bend946824ef7955b6c@mail.gmail.com>
	<COL110-W1236CED756D3C9374CB0A2B7350@phx.gbl>
Message-ID: <79153a2e1003072348r16fd4427i7ea2b3fbdd626c91@mail.gmail.com>

First of all, you simply can't use this straight approach of primality
testing for very very big numbers. There are a number of algorithms, both
deterministic and random. Please Google for them (and don't forget to check
Wikipedia too). Study the random algorithms to check whether they can be
applied in your situation, since they are faster.

And another implementation issue. Try to avoid many recursive calls. It's
always possible to convert a recursive function to a non-recursive one and
that will be faster if your recursion is too long.

Hope it helps.

Regards
Taskinoor Hasan (Sajid)

On Mon, Mar 8, 2010 at 1:15 PM, Fahad Ahmad <miraclesoul at hotmail.com> wrote:

>  Thanks Geremy,
>
> That has been an absolute bump........... GOD i cant sit on my chair, it
> has worked even on 512 bit number and with no time..........
> superb i would say.
>
> lastly, i am using the code below to calculate Largest Prime factor of a
> number:
>
> print
> ('''==============================================================================='''
>        '''              CALCULATE  HIGHEST PRIME
> FACTOR                                  '''
>
> '''===============================================================================''')
>
> #!/usr/bin/env python
> def highest_prime_factor(n):
>    if isprime(n):
>       return n
>    for x in xrange(2,n ** 0.5 + 1):
>       if not n % x:
>          return highest_prime_factor(n/x)
> def isprime(n):
>    for x in xrange(2,n ** 0.5 + 1):
>       if not n % x:
>          return False
>    return True
> if  __name__ == "__main__":
>    import time
>    start = time.time()
>    print highest_prime_factor(1238162376372637826)
>    print time.time() - start
>
> the code works with a bit of delay on the number : "1238162376372637826"
> but extending it to
> (109026109913291424366305511581086089650628117463925776754560048454991130443047109026109913291424366305511581086089650628117463925776754560048454991130443047)
>  makes python go crazy. Is there any way just like above, i can have it
> calculated it in no time.
>
>
> thanks for the support.
>
>
>
>
> > Date: Sun, 7 Mar 2010 15:40:59 -0500
> > Subject: Re: Calculating very large exponents in python
> > From: debatem1 at gmail.com
> > To: miraclesoul at hotmail.com
> > CC: python-list at python.org
>
> >
> > On Sun, Mar 7, 2010 at 1:55 PM, Fahad Ahmad <miraclesoul at hotmail.com>
> wrote:
> > > Dear All,
> > >
> > > i am writing my crytographic scheme in python, i am just a new user to
> it.
> > > I have written the complete code, the only point i am stuck it is that
> i am
> > > using 256 exponentiation which is normal in crytography but python just
> > > hangs on it.
> > >
> > > g**x  [where both g and x are 256 bit numbers , in decimal they are
> around
> > > 77]
> > >
> > > after reading several forums, i just come to know it can be done using
> > > numpy, i have installed python(x,y) has has both numpy and scipy
> installed
> > > but i am not able to make it happen.
> > >
> > > any idea which library, module, or piece of code can solve this mystery
> :S
> > >
> > > sorry for bad english
> >
> > A couple of things:
> >
> > 1) if you're working with modular exponentiation, remember that pow()
> takes
> > three arguments, ie:
> >
> > a = 222222222222222222222222222
> > b = 5555555555555555555555555555
> > pow(a, b, 1200)
> >
> > will calculate the correct answer (768) very quickly, while
> >
> > a**b % 1200
> >
> > has not terminated in the time it took me to compose this
> > email.
> >
> > 2) sage has a lot of excellent tools for crypto/cryptanalysis that you
> > may want to take a look at.
> >
> > 3) not saying you don't know what you're doing, but be careful when
> > rolling your own cryptosystems- even very good cryptographers make
> > implementation mistakes!
> >
> > Geremy Condra
>
> ------------------------------
> Hotmail: Powerful Free email with security by Microsoft. Get it now.<http://clk.atdmt.com/GBL/go/201469230/direct/01/>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From dr.cg at 126.com  Mon Mar  8 03:49:15 2010
From: dr.cg at 126.com (CHEN Guang)
Date: Mon, 8 Mar 2010 16:49:15 +0800 (CST)
Subject: The C language like the Python, by the Python and for the
	Python--- PythoidC
In-Reply-To: <mailman.2684.1268034483.23597.python-list@python.org>
References: <mailman.2684.1268034483.23597.python-list@python.org>
Message-ID: <195722f.da8d.1273cf6bb23.Coremail.dr.cg@126.com>

Dear Stefan, 
Thanks a lot for your interest in PythoidC.
Yes, PythoidC takes regular expression to parse C header files, 
but there is no danger at all, because, the parsed result is only used for 
introspecting and auto-completion, has noting to do with syntax converting and compiling.
I just improved PythoidC to a satisfying version for me, up to now, all the projects
with PythoidC are experimental or educational.
PythoidC is mainly used to deal with simple but time consuming tasks in Python project, 
as you see, PythoidC file can be imported the same any Python files.
Oliver ( ChenGuang )
?
CHEN Guang, 08.03.2010 06:08:
> Hi, if you are interested in C-Python mixed programming, please take a look at:
> http://pythoidc.googlecode.com
> PythoidC is the C language like the Python, by the Python and for the Python

It looks a bit dangerous to me to parse C header files only with regular 
expressions. For Cython, some people seem to be using gcc-xml instead, and 
some have reported that clang is really nice to play with. However, none of 
those has made its way into Cython yet, mostly due to the dependency it 
would add. I don't know if tcc (which you seem to depend on) has anything 
comparable, but I doubt it.

Just out of curiosity, is this syntax converter actually used for any real 
projects?

Stefan
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From bruno.42.desthuilliers at websiteburo.invalid  Mon Mar  8 03:53:47 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Mon, 08 Mar 2010 09:53:47 +0100
Subject: isinstance(False, int)
In-Reply-To: <mailman.370.1267815705.23598.python-list@python.org>
References: <mailman.357.1267809307.23598.python-list@python.org>
	<m2aaum1w8q.fsf@googlemail.com> <hmrinv$ftq$1@dough.gmane.org>
	<mailman.370.1267815705.23598.python-list@python.org>
Message-ID: <4b94baf3$0$20649$426a74cc@news.free.fr>

Rolando Espinoza La Fuente a ?crit :
> On Fri, Mar 5, 2010 at 2:32 PM, mk <mrkafk at gmail.com> wrote:
>> Arnaud Delobelle wrote:
>>
>>>>>> 1 == True
>>> True
>>>>>> 0 == False
>>> True
>>>
>>> So what's your question?
>> Well nothing I'm just kind of bewildered: I'd expect smth like that in Perl,
>> but not in Python.. Although I can understand the rationale after skimming
>> PEP 285, I still don't like it very much.
>>
> 
> So, the pythonic way to check for True/False should be:
> 
>>>> 1 is True
> False
> 
>>>> 0 is False
> False
> 
> instead of ==, right?

Nope. The pythonic way is to check for truth value - not for True or 
False -, and to only use the identity test when wanting to test for 
identity.



From fox.joe87 at gmail.com  Mon Mar  8 03:59:14 2010
From: fox.joe87 at gmail.com (Mahesh)
Date: Mon, 8 Mar 2010 00:59:14 -0800 (PST)
Subject: libc Sleep api performs a busy waiting
Message-ID: <a52b97c0-7266-4bc6-9ab4-3a8688120a6c@u19g2000prh.googlegroups.com>

Hi,

 I am having a problem while using sleep function from libc , the
thread in which i am calling it is getting struck and not allowing
other threads to execute.  Here is a simple code that i am trying to
exeute

import threading
import time
import dl


def dummy1():
    a=dl.open('/lib/libc.so.6')
    print "in thread 1 Start"
    a.call('sleep',2)
    #time.sleep(2)
    print "in thread 1 End"

def dummy2():
    print "in thread 2 Start"
    time.sleep(1)
    print "in thread 2 End"
newThread1=threading.Thread(None,dummy1)
newThread2=threading.Thread(None,dummy2)
newThread1.start()
newThread2.start()

print "in main"



The out put of this program is  (In this case thread 1 even though i
am calling a sleep function its not allowing other threads to execute,
other threads execute only after the completion of first thread)

in thread 1 Start
in thread 1 End
in thread 2 Start
in main
in thread 2 End


where as if i use time.sleep instead of a.call(sleep) the out put is
(which i guess is right behaviour, because it start the threads and
suspends them because the have sleep , and continue executing the main
thread)
in thread 1 Start
in thread 2 Start
in main
in thread 2 End
in thread 1 End




From processor.dev1l at gmail.com  Mon Mar  8 04:26:58 2010
From: processor.dev1l at gmail.com (Processor-Dev1l)
Date: Mon, 8 Mar 2010 01:26:58 -0800 (PST)
Subject: running a program on many processors
References: <hn1ft2$i5l$1@atlantis.news.neostrada.pl>
Message-ID: <112ea184-1e81-45aa-b5ed-73d6ded7a460@d2g2000yqa.googlegroups.com>

On Mar 8, 1:18?am, Pawe? Bany? <moc.li... at synabp.reverse_the_string>
wrote:
> Hello,
>
> I have already read about Python and multiprocessing which allows using
> many processors. The idea is to split a program into separate tasks and
> run each of them on a separate processor. However I want to run a Python
> program doing a single simple task on many processors so that their
> cumulative power is available to the program as if there was one huge
> CPU instead of many separate ones. Is it possible? How can it be achieved?
>
> Best regards,
>
> Pawe?

I can suggest you to try some .NET language (like c#, Boo <-- python-
like, or maybe even IronPython). Reason is that .NET languages do
analyze the code and split them into logical parts that run across
threads.


From fox.joe87 at gmail.com  Mon Mar  8 04:30:45 2010
From: fox.joe87 at gmail.com (Joe Fox)
Date: Mon, 8 Mar 2010 15:00:45 +0530
Subject: libc Sleep api performs a busy waiting
Message-ID: <27e52ad11003080130v7664d951p3ba92bd692efe0ad@mail.gmail.com>

Hi ,

 I am having a problem while using sleep function from libc , the
thread in which i am calling it is getting struck and not allowing
other threads to execute.  Here is a simple code that i am trying to
exeute

import threading
import time
import dl

def dummy1():
    a=dl.open('/lib/libc.so.6')
    print "in thread 1 Start"
    a.call('sleep',2)
    #time.sleep(2)
    print "in thread 1 End"

def dummy2():
    print "in thread 2 Start"
    time.sleep(1)
    print "in thread 2 End"
newThread1=threading.Thread(None,dummy1)
newThread2=threading.Thread(None,dummy2)
newThread1.start()
newThread2.start()

print "in main"

The out put of this program is  (In this case thread 1 even though i
am calling a sleep function its not allowing other threads to execute,
other threads execute only after the completion of first thread)

in thread 1 Start
in thread 1 End
in thread 2 Start
in main
in thread 2 End
where as if i use time.sleep instead of a.call(sleep) the out put is
(which i guess is right behaviour, because it start the threads and
suspends them because the have sleep , and continue executing the main
thread)
in thread 1 Start
in thread 2 Start
in main
in thread 2 End
in thread 1 End


Can any of you point me how to over come this.?
Thanks
Mahesh
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From davea at ieee.org  Mon Mar  8 05:13:09 2010
From: davea at ieee.org (Dave Angel)
Date: Mon, 08 Mar 2010 05:13:09 -0500
Subject: Reverse engineering CRC?
In-Reply-To: <4b947298$0$8836$c3e8da3@news.astraweb.com>
References: <7vj7fdFnnjU1@mid.individual.net>
	<4b947298$0$8836$c3e8da3@news.astraweb.com>
Message-ID: <4B94CDB5.9010506@ieee.org>

Steven D'Aprano wrote:
> On Mon, 08 Mar 2010 16:09:12 +1300, Gregory Ewing wrote:
>
>   
>> Given some known data/crc pairs, how feasible is it to figure out the
>> polynomial being used to generate the crc?
>>     
>
> Google is your friend:
>
> http://www.woodmann.com/fravia/crctut1.htm
>
>   
That page was interesting to read, especially since I've implemented the 
three algorithms - CRC16, CRC32, and the reversed version of CRC16, all 
in the long-distant past.

However, if there's anything in there about how to derive the polynomial 
algorithm from (a few) samples I missed it entirely. Instead, what it 
calls reverse engineering is figuring out how to modify a message to 
force it to have a desired CRC value (when the CRC polynomial is already 
known).

DaveA



From mail at timgolden.me.uk  Mon Mar  8 05:38:52 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Mon, 08 Mar 2010 10:38:52 +0000
Subject: Best practice way to detect internet connectivity under Python
	2.6/Windows
In-Reply-To: <1268016090.13219.1363604225@webmail.messagingengine.com>
References: <1268016090.13219.1363604225@webmail.messagingengine.com>
Message-ID: <4B94D3BC.8040808@timgolden.me.uk>

On 08/03/2010 02:41, python at bdurham.com wrote:
> Is the best pratice way to detect internet connectivity under
> Windows (using Python 2.6) simply to attempt to access a known
> internet website using urllib or urlib2 wrapped in a try/except
> construct?

Well, in theory you could use the Internet API:

   http://msdn.microsoft.com/en-us/library/aa383996%28VS.85%29.aspx

which is exposed via the win32inet module:

   http://timgolden.me.uk/pywin32-docs/win32inet.html

but I'd just do a socket connection to port 80 (or some known port
on some known server)  with a reasonable timeout.

TJG


From fetchinson at googlemail.com  Mon Mar  8 05:53:25 2010
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Mon, 8 Mar 2010 11:53:25 +0100
Subject: Curiosity stirkes me on 'import this'.
In-Reply-To: <2d56febf1003070159o5346701ema0ba72a43066ace2@mail.gmail.com>
References: <2d56febf1003070159o5346701ema0ba72a43066ace2@mail.gmail.com>
Message-ID: <fbe2e2101003080253n683676d4veb0aceab732d1725@mail.gmail.com>

> I took a look at the 'this' module to see where the file is stored. This is
> probably old news to some people, but was new to me.
>
> print this.s
> Gur Mra bs Clguba, ol Gvz Crgref
>
> Ornhgvshy vf orggre guna htyl.
> Rkcyvpvg vf orggre guna vzcyvpvg.
> Fvzcyr vf orggre guna pbzcyrk.
> Pbzcyrk vf orggre guna pbzcyvpngrq.
> Syng vf orggre guna arfgrq.
> Fcnefr vf orggre guna qrafr.
> Ernqnovyvgl pbhagf.
> Fcrpvny pnfrf nera'g fcrpvny rabhtu gb oernx gur ehyrf.
> Nygubhtu cenpgvpnyvgl orngf chevgl.
> Reebef fubhyq arire cnff fvyragyl.
> Hayrff rkcyvpvgyl fvyraprq.
> Va gur snpr bs nzovthvgl, ershfr gur grzcgngvba gb thrff.
> Gurer fubhyq or bar-- naq cersrenoyl bayl bar --boivbhf jnl gb qb vg.
> Nygubhtu gung jnl znl abg or boivbhf ng svefg hayrff lbh'er Qhgpu.
> Abj vf orggre guna arire.
> Nygubhtu arire vf bsgra orggre guna *evtug* abj.
> Vs gur vzcyrzragngvba vf uneq gb rkcynva, vg'f n onq vqrn.
> Vs gur vzcyrzragngvba vf rnfl gb rkcynva, vg znl or n tbbq vqrn.
> Anzrfcnprf ner bar ubaxvat terng vqrn -- yrg'f qb zber bs gubfr!
>
> And some other attributes in 'this' module as well, that decodes the string.
> I'm curious. Was this encoded purely for fun?

Yes.

Cheers,
Daniel




-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From greg.ewing at canterbury.ac.nz  Mon Mar  8 06:06:36 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Tue, 09 Mar 2010 00:06:36 +1300
Subject: Reverse engineering CRC?
In-Reply-To: <4b9471ee$0$8836$c3e8da3@news.astraweb.com>
References: <7vj7fdFnnjU1@mid.individual.net>
	<4b9471ee$0$8836$c3e8da3@news.astraweb.com>
Message-ID: <7vk3eiFtivU1@mid.individual.net>

Steven D'Aprano wrote:

> Can you just ask the application developer what CRC is being used? Or 
> look at the source code? Disassemble the binary?

There's no source, and the binary is enormous. I could ask,
but I wouldn't hold out much hope of them being willing to
tell me.

>>it appears that the crc size may be at least
>>24 bits, so just trying all possible polynomials probably isn't doable.
> 
> "At least"? Can't you tell by looking at them?

It's not entirely clear exactly which bytes are part of the
CRC. There are 3 adjacent bytes in the header of the file
that change when I modify the contents, which led me to
think it was a 24-bit CRC. But I now believe that one of
them is not part of the CRC, and it's actually 16 bits.

Using pycrc, I've now tried all possible 16-bit polynomials,
with various combinations of bit and byte reversal, but I
haven't found one that works consistently, so I'm wondering
whether it's using some non-standard algorithm.

-- 
Greg


From vlastimil.brom at gmail.com  Mon Mar  8 06:13:31 2010
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Mon, 8 Mar 2010 12:13:31 +0100
Subject: negative "counts" in collections.Counter?
In-Reply-To: <e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com>
References: <mailman.437.1267995887.23598.python-list@python.org>
	<m2eijv4vtk.fsf@googlemail.com>
	<4b9456f4$0$8836$c3e8da3@news.astraweb.com>
	<e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com>
Message-ID: <9fdb569a1003080313mf6c8d9cr932678c11c4e80e4@mail.gmail.com>

2010/3/8 Raymond Hettinger <python at rcn.com>:
> On Mar 7, 5:46?pm, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
>> Given that Counter supports negative counts, it looks to me that the
>> behaviour of __add__ and __sub__ is fundamentally flawed. You should
>> raise a bug report (feature enhancement) on the bug tracker.
>
> It isn't a bug. ?I designed it that way.
> There were several possible design choices,
> each benefitting different use cases.
>...
> One possible choice (the one preferred by the OP) was to
> has addition and subtraction be straight adds and subtracts
> without respect to sign and to not support __and__ and __or__.
> Straight addition was already supported via the update() method.
> But no direct support was provided for straight subtractions
> that leave negative values. ?Sorry about that.
>
> Instead the choice was to implement the four methods as
> multiset operations. ?As such, they need to correspond
> to regular set operations. ?For example, with sets:
>
>...
> Hopes this gives you some insight into the design choices.
>
>
> Raymond Hettinger
>
Thank you very much for the exhaustive explanation Raymond!
I very much suspected, there would be some exact reasoning behind it,
as these negative counts are explicitly handled in the code of these
methods.
I just happened to expect the straightforward addition and subtraction
and possibly the zero truncation or an exception in incompatible cases
(like elements() with floats, currently). This way also the negative
part would be available and the truncation possible.
I am by far not able to follow all of the mathematical background, but
even for zero-truncating multiset, I would expect the truncation on
input rather than on output of some operations. E.g. the following
seems surprising to me in context of the discarded negatives by
addition or subtraction:

>>> c1=collections.Counter({'a': -11, 'b': -8})
>>> c2=collections.Counter({'a': 3})
>>> c2-c1
Counter({'a': 14, 'b': 8})
>>>

Probably a kind of negative_update()  or some better named method will
be handy, like the one you supplied or simply the current module code
without the newcount > 0: ... condition. Or would it be an option to
have a keyword argument like zero_truncate=False which would influence
this behaviour? Or is some other method than elements() incompatible
with negative counts?
(I actually can imagine comparing negative counts on both sides. e.g.
in a secondary comparison of two wordlists with specific removed items
- comparing to the "master" list.)
Additionally, were issubset and issuperset considered for this
interface (not sure whether symmetric_difference would be applicable)?

Anyway, I recognise, that I can easily use a custom class for these
tasks, if these usecases are rare or non-standard for this general
collection object.
Thanks again,
  vbr


From kshipras at packtpub.com  Mon Mar  8 06:25:07 2010
From: kshipras at packtpub.com (Kshipra Singh)
Date: Mon, 8 Mar 2010 16:55:07 +0530
Subject: Opportunity to author Python books- Packt Publishing. 
Message-ID: <B9C59EAAF7F14FF98A361596DD5525B4@sonyPC>

Hi All,

I am writing to you for Packt Publishing, the publishers computer related books.

We are planning to extend our catalogue of cookbooks and are currently inviting "Python" fanatics interested in writing a cookbook. So, if you love "Python" and are interested in writing a cookbook, please contact us with your book ideas at author at packtpub.com. Even if you do not have a book idea and are simply interested in authoring a cookbook, we are keen to hear from you. 

More details about the opportunity are available at: http://authors.packtpub.com/content/python-fanatics-invited-write-packt

Thanks
Kshipra Singh
Author Relationship Manager
Packt Publishing
www.PacktPub.com
 
Skype: kshiprasingh15
Twitter: http://twitter.com/kshipras
 
Interested in becoming an author? Visit http://authors.packtpub.com for all the information you need about writing for Packt.
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From ben+python at benfinney.id.au  Mon Mar  8 06:34:11 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Mon, 08 Mar 2010 22:34:11 +1100
Subject: Curiosity stirkes me on 'import this'.
References: <2d56febf1003070159o5346701ema0ba72a43066ace2@mail.gmail.com>
	<mailman.454.1268045612.23598.python-list@python.org>
Message-ID: <871vfv11zg.fsf@benfinney.id.au>

Daniel Fetchinson <fetchinson at googlemail.com> writes:

> > I'm curious. Was this encoded purely for fun?
>
> Yes.

For some more fun, try measuring the ?this? module source code against
the principles in the Zen.

-- 
 \                 ?Leave nothing to chance. Overlook nothing. Combine |
  `\          contradictory observations. Allow yourself enough time.? |
_o__)                                                     ?Hippocrates |
Ben Finney


From steve at REMOVE-THIS-cybersource.com.au  Mon Mar  8 07:21:18 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 08 Mar 2010 12:21:18 GMT
Subject: negative "counts" in collections.Counter?
References: <mailman.437.1267995887.23598.python-list@python.org>
	<m2eijv4vtk.fsf@googlemail.com>
	<4b9456f4$0$8836$c3e8da3@news.astraweb.com>
	<e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com>
Message-ID: <4b94ebbd$0$8762$c3e8da3@news.astraweb.com>

On Sun, 07 Mar 2010 22:31:00 -0800, Raymond Hettinger wrote:

> On Mar 7, 5:46?pm, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
>> Given that Counter supports negative counts, it looks to me that the
>> behaviour of __add__ and __sub__ is fundamentally flawed. You should
>> raise a bug report (feature enhancement) on the bug tracker.
> 
> It isn't a bug.  I designed it that way. There were several possible
> design choices, each benefitting different use cases.

Thanks for the explanation Raymond. A few comments follow:


> FWIW, here is the reasoning behind the design.
> 
> The basic approach to Counter() is to be a dict subclass that supplies
> zero for missing values.   This approach places almost no restrictions
> on what can be stored in it. You can store floats, decimals, fractions,
> etc. Numbers can be positive, negative, or zero.

Another way of using default values in a dict. That's five that I know 
of: dict.get, dict.setdefault, dict.pop, collections.defaultdict, and 
collections.Counter. And the Perl people criticise Python for having 
"only one way to do it" *wink*

(That's not meant as a criticism, merely an observation.)


[...]
> One possible choice (the one preferred by the OP) was to has addition
> and subtraction be straight adds and subtracts without respect to sign
> and to not support __and__ and __or__. Straight addition was already
> supported via the update() method. But no direct support was provided
> for straight subtractions that leave negative values.  Sorry about that.

Would you consider a feature enhancement adding an additional method, 
analogous to update(), to perform subtractions? I recognise that it's 
easy to subclass and do it yourself, but there does seem to be some 
demand for it, and it is an obvious feature given that Counter does 
support negative counts.


> Instead the choice was to implement the four methods as multiset
> operations.  As such, they need to correspond to regular set operations.

Personally, I think the behaviour of + and - would be far less surprising 
if the class was called Multiset. Intuitively, one would expect counters 
to be limited to ints, and to support negative counts when adding and 
subtracting. In hindsight, do you think that Multiset would have been a 
better name?



-- 
Steven


From steve at holdenweb.com  Mon Mar  8 07:28:06 2010
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 08 Mar 2010 07:28:06 -0500
Subject: A "scopeguard" for Python
In-Reply-To: <hn29il$sbv$1@news.eternal-september.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>	<hmn03d$5r6$1@news.eternal-september.org>	<mailman.292.1267717742.23598.python-list@python.org>	<hmooo6$pg0$1@news.eternal-september.org>	<mailman.300.1267723245.23598.python-list@python.org>	<hmoul7$2i9$1@news.eternal-september.org>	<mailman.314.1267744631.23598.python-list@python.org>	<hmph3
	b$20o$1@news.eternal-september.org>	<mailman.439.1268013689.23598.python-list@python.org>
	<hn29il$sbv$1@news.eternal-september.org>
Message-ID: <hn2qia$886$1@dough.gmane.org>

Alf P. Steinbach wrote:
> * Gabriel Genellina:
>> En Thu, 04 Mar 2010 20:52:04 -0300, Alf P. Steinbach <alfps at start.no>
>> escribi?:
>>
>>> Sorry, as with the places noted above, I can't understand what you're
>>> trying to say here.
>>
>> Regarding your posts, neither can I. All the time. Sorry, deciphering
>> your posts would force me to spend much more time than available and I
>> can't afford that - so I'm blocking your messages from now on.
> 
> 
> You could just ask if there was anything you didn't understand.
> 
> Even with as little you quote readers can see my approach to that
> problem: asking.
> 
> But your response, both the out of context quoting and your comment,
> seems solely designed to convey a negative impression instead of
> addressing any technical issue.
> 
This isn't an isolated case, Alf. Physician, heal thyself.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Mon Mar  8 07:33:57 2010
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 08 Mar 2010 07:33:57 -0500
Subject: libc Sleep api performs a busy waiting
In-Reply-To: <a52b97c0-7266-4bc6-9ab4-3a8688120a6c@u19g2000prh.googlegroups.com>
References: <a52b97c0-7266-4bc6-9ab4-3a8688120a6c@u19g2000prh.googlegroups.com>
Message-ID: <hn2qta$886$2@dough.gmane.org>

Mahesh wrote:
> Hi,
> 
>  I am having a problem while using sleep function from libc , the
> thread in which i am calling it is getting struck and not allowing
> other threads to execute.  Here is a simple code that i am trying to
> exeute
> 
> import threading
> import time
> import dl
> 
> 
> def dummy1():
>     a=dl.open('/lib/libc.so.6')
>     print "in thread 1 Start"
>     a.call('sleep',2)
>     #time.sleep(2)
>     print "in thread 1 End"
> 
> def dummy2():
>     print "in thread 2 Start"
>     time.sleep(1)
>     print "in thread 2 End"
> newThread1=threading.Thread(None,dummy1)
> newThread2=threading.Thread(None,dummy2)
> newThread1.start()
> newThread2.start()
> 
> print "in main"
> 
> 
> 
> The out put of this program is  (In this case thread 1 even though i
> am calling a sleep function its not allowing other threads to execute,
> other threads execute only after the completion of first thread)
> 
> in thread 1 Start
> in thread 1 End
> in thread 2 Start
> in main
> in thread 2 End
> 
> 
> where as if i use time.sleep instead of a.call(sleep) the out put is
> (which i guess is right behaviour, because it start the threads and
> suspends them because the have sleep , and continue executing the main
> thread)
> in thread 1 Start
> in thread 2 Start
> in main
> in thread 2 End
> in thread 1 End
> 
> 
Why not just use the time module's sleep function? Unlike the libc code
it releases Python's GIL (global interpreter lock), thus allowing other
threads to run.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From jeanmichel at sequans.com  Mon Mar  8 08:02:46 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 08 Mar 2010 14:02:46 +0100
Subject: Conditional based on whether or not a module is being used
In-Reply-To: <f4de1c96-502a-42e7-b647-ce52d0f76f2f@u15g2000prd.googlegroups.com>
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>	<50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com>
	<14a5cd5e1003051225j1d596aa2nfe9eb1047037f19d@mail.gmail.com>
	<mailman.383.1267823696.23598.python-list@python.org>
	<f4de1c96-502a-42e7-b647-ce52d0f76f2f@u15g2000prd.googlegroups.com>
Message-ID: <4B94F576.6050708@sequans.com>

Pete Emerson wrote:
> On Mar 5, 1:14 pm, Chris Rebert <c... at rebertia.com> wrote:
>   
>> On Fri, Mar 5, 2010 at 12:25 PM, Pete Emerson <pemer... at gmail.com> wrote:
>>     
>>> On Fri, Mar 5, 2010 at 12:17 PM, Chris Rebert <c... at rebertia.com> wrote:
>>>       
>>>> On 3/5/10, Pete Emerson <pemer... at gmail.com> wrote:
>>>>         
>>>>> In a module, how do I create a conditional that will do something
>>>>> based on whether or not another module has been loaded?
>>>>>           
>> <snip>
>>     
>>>>> If someone is using foo module, I want to take advantage of its
>>>>> features and use it in foobar, otherwise, I want to do something else.
>>>>> In other words, I don't want to create a dependency of foobar on foo.
>>>>>           
>>>>> My failed search for solving this makes me wonder if I'm approaching
>>>>> this all wrong.
>>>>>           
>>>> Just try importing foo, and then catch the exception if it's not installed.
>>>>         
>> <snip>
>>     
>>> Except I want to use the module only if the main program is using it
>>> too, not just if it's available for use. I think that I found a way in
>>> my follow-up post to my own message, but not sure it's the best way or
>>> conventional.
>>>       
>> What is your use case for this behavior exactly? You've piqued my curiosity.
>>
>> Cheers,
>> Chris
>> --http://blog.rebertia.com
>>     
>
> I have written my first module called "logger" that logs to syslog via
> the syslog module but also allows for logging to STDOUT in debug mode
> at multiple levels (to increase verbosity depending on one's need), or
> both. I've looked at the logging module and while it might suit my
> needs, it's overkill for me right now (I'm still *very* much a python
> newbie).
>
> I want to write other modules, and my thinking is that it makes sense
> for those modules to use the "logger" module to do the logging, if and
> only if the parent using the other modules is also using the logger
> module.
>
> In other words, I don't want to force someone to use the "logger"
> module just so they can use my other modules, even if the "logger"
> module is installed ... but I also want to take advantage of it if I'm
> using it.
>
> Now that I've written that, I'm not sure that makes a whole lot of
> sense. It seems like I could say, "hey, this person has the 'logger'
> module available, let's use it!".
>
> Thoughts?
>   
The logging module is not overkill, use it.
It can be simple if you want it to be, and can be more complex if you 
need advanced logging features.

All the "what if the application is not using my logger module" is dealt 
with by the logging module.
And I'm not its designer in any way, so my advice is completely 
objective :-)

It's definitely worth spending some time ramping up with it.

JM



From davea at ieee.org  Mon Mar  8 08:07:27 2010
From: davea at ieee.org (Dave Angel)
Date: Mon, 08 Mar 2010 08:07:27 -0500
Subject: Reverse engineering CRC?
In-Reply-To: <7vk3eiFtivU1@mid.individual.net>
References: <7vj7fdFnnjU1@mid.individual.net>	<4b9471ee$0$8836$c3e8da3@news.astraweb.com>
	<7vk3eiFtivU1@mid.individual.net>
Message-ID: <4B94F68F.3000100@ieee.org>

Gregory Ewing wrote:
> Steven D'Aprano wrote:
>
>> Can you just ask the application developer what CRC is being used? Or 
>> look at the source code? Disassemble the binary?
>
> There's no source, and the binary is enormous. I could ask,
> but I wouldn't hold out much hope of them being willing to
> tell me.
>
>>> it appears that the crc size may be at least
>>> 24 bits, so just trying all possible polynomials probably isn't doable.
>>
>> "At least"? Can't you tell by looking at them?
>
> It's not entirely clear exactly which bytes are part of the
> CRC. There are 3 adjacent bytes in the header of the file
> that change when I modify the contents, which led me to
> think it was a 24-bit CRC. But I now believe that one of
> them is not part of the CRC, and it's actually 16 bits.
>
> Using pycrc, I've now tried all possible 16-bit polynomials,
> with various combinations of bit and byte reversal, but I
> haven't found one that works consistently, so I'm wondering
> whether it's using some non-standard algorithm.
>
Or even some other standard algorithm.  If you know so little about the 
value, how do you even know it's a CRC ?  Could it be a ones-complement 
sum, such as used in Ethernet?

Is the problem really worth it?  The possibilities are practically 
unbounded.  And if the developer is really determined to make it 
difficult, they could be doing multiple passes over the data, in which 
case probably disassembly (or subtle debug tracing) may be your best bet.

DaveA

Dave



From jeanmichel at sequans.com  Mon Mar  8 08:10:48 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 08 Mar 2010 14:10:48 +0100
Subject: Import problem
In-Reply-To: <6630f859-b85d-4841-b1d5-2a563dca9cbb@q15g2000yqj.googlegroups.com>
References: <6630f859-b85d-4841-b1d5-2a563dca9cbb@q15g2000yqj.googlegroups.com>
Message-ID: <4B94F758.9080101@sequans.com>

Johny wrote:
> I have this directory structure
>
> C:
>       \A
>          __init__.py
>          amodule.py
>
>          \B
>           __init__.py
>           bmodule.py
>
>            \D
>             __init__.py
>             dmodule.py
>
> and  I want to import  bmodule.py
> C:\>cd \
>
> C:\>python
> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
> (Intel)] on win
> 32
> Type "help", "copyright", "credits" or "license" for more information.
>   
>>>> from A.B import  bmodule
>>>>         
> I am bmodule
>   
> C:\>
>
> so far so good. Now I would like to import bmodule but if the current
> directory is \D subdirectory.
>
> C:> cd \A\B\D
> C:\A\B\D>
> C:\A\B\D>python
> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
> (Intel)] on win
> 32
> Type "help", "copyright", "credits" or "license" for more information.
>   
>>>> import sys
>>>> sys.path.append('C:\\A')
>>>> from A.B import bmodule
>>>>         
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> ImportError: No module named A.B
>
> C:\>
>
> so I can not import a module from the parent directory? Or where did I
> make an error?
> Thanks for help
>
> L.
>   
try

import sys
sys.path.append('C:\\')
from A.B import bmodule


JM



From earnmoney9421 at gmail.com  Mon Mar  8 08:40:03 2010
From: earnmoney9421 at gmail.com (Google Adsense)
Date: Mon, 8 Mar 2010 05:40:03 -0800 (PST)
Subject: What to do if anything bites.
Message-ID: <dbf9320f-a9b9-492c-9a5e-c687422c1464@y7g2000prc.googlegroups.com>

What to do if anything bites.

Check our bites treatment at

http://108ambulance.blogspot.com/2010/03/108-ambulance-home-page.html


From aotto1968 at users.sourceforge.net  Mon Mar  8 08:43:46 2010
From: aotto1968 at users.sourceforge.net (Andreas Otto)
Date: Mon, 08 Mar 2010 14:43:46 +0100
Subject: ANNOUNCE: Major Feature Release - NHI1-0.7, PLMK-1.6 and libmsgque-4.5
Message-ID: <hn2uui$qb5$03$2@news.t-online.com>

Dear User,


ANNOUNCE:    Major Feature Release
====================================

  libmsgque: Application-Server-Toolkit for
             C, C++, JAVA, C#, TCL, PERL, PYTHON, VB.NET
  PLMK:      Programming-Language-Microkernel
  NHI1:      Non-Human-Intelligence #1


SUMMARY
=======

This is a 'major-feature-release' to add 'longtime-transaction' support.

A 'longtime-transaction' is a transaction with a possible infinite time
period between the start and the end. A 'longtime-transaction' is always
a 'persistent-transaction' too. The 'persistent' support is available as
an in-memory solution on the 'application-server' or in an additional
'bidirectional-filter' available for the next release.

A typical scenario for a 'longtime-transaction' is:

* A user with a client connect to the server and start a
'longtime-transaction' job. After a while the user shutdown the client
and leave the office. At the next morning the user start the client
again and the results are send from the server to the client.
* On a space mission the time-overhead between transaction start and end
is large. It is usually not possible to keep the
client-server-connection open all the time.
* On a military action-system the enemy try to interrupted the
client-server-connection to disable data communication.

To use a 'longtime-transaction' the results are send to a
'client-service' registered with MqServiceCreate. This service and
addtional data (I call this data 'local-context-data') have to be added
to the 'longterm-transaction' package to be available in the result. On the
'link-target' the 'local-context-data' is initial stripped from the
'data-package' and is later added to the results again.

The 'local-context-data' is added to the 'data-package' with
MqSendT_START and MqSendT_END.
The 'local-context-data' is read from the 'data-package' with
MqReadT_START and MqReadT_END.


LINKS
=====

  libmsgque:
   > http://nhi1.berlios.de/theLink/index.htm
  NHI1:
   > http://nhi1.berlios.de/
  DOWNLOAD:
   > http://developer.berlios.de/projects/nhi1/



mfg

  Andreas Otto (aotto1968)


From ssteinerx at gmail.com  Mon Mar  8 09:03:21 2010
From: ssteinerx at gmail.com (ssteinerX@gmail.com)
Date: Mon, 8 Mar 2010 09:03:21 -0500
Subject: A "scopeguard" for Python
In-Reply-To: <hn2qia$886$1@dough.gmane.org>
References: <hmlu55$n1s$1@news.eternal-september.org>	<57a0a876-31c5-4b02-8c2d-d45f3c922901@z35g2000yqd.googlegroups.com>	<hmm0rd$a48$1@news.eternal-september.org>	<mailman.211.1267636174.23598.python-list@python.org>	<hmm5ln$arg$1@news.eternal-september.org>	<mailman.221.1267642316.23598.python-list@python.org>	<hmmdgd$17s$1@news.eternal-september.org>	<mailman.241.1267650180.23598.python-list@python.org>	<hmmkmh$mt1$1@news.eternal-september.org>	<mailman.260.1267658935.23598.python-list@python.org>	<hmn03d$5r6$1@news.eternal-september.org>	<mailman.292.1267717742.23598.python-list@python.org>	<hmooo6$pg0$1@news.eternal-september.org>	<mailman.300.1267723245.23598.python-list@python.org>	<hmoul7$2i9$1@news.eternal-september.org>	<mailman.314.1267744631.23598.python-list@python.org>	<hmph3
	b$20o$1@news.eternal-september.org>	<mailman.439.1268013689.23598.python-list@python.org>
	<hn29il$sbv$1@news.eternal-september.org>
	<hn2qia$886$1@dough.gmane.org>
Message-ID: <759A6420-DC8E-4282-8667-6C851D5E0AC8@gmail.com>

On Mar 8, 2010, at 7:28 AM, Steve Holden wrote:

>> 
>> But your response, both the out of context quoting and your comment,
>> seems solely designed to convey a negative impression instead of
>> addressing any technical issue.
>> 
> This isn't an isolated case, Alf. Physician, heal thyself.

As far as I can tell, this happens on every thread Alf is involved in at one point or another.  I'm sure it's "everyone else."

S



From xahlee at gmail.com  Mon Mar  8 10:12:05 2010
From: xahlee at gmail.com (Xah Lee)
Date: Mon, 8 Mar 2010 07:12:05 -0800 (PST)
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<4b90a1f8$0$1629$742ec2ed@news.sonic.net>
Message-ID: <0d381135-730a-45e4-9225-9ba2a29b77fe@k2g2000pro.googlegroups.com>

many people mentioned scalibility... though i think it is fruitful to
talk about at what size is the NoSQL databases offer better
scalability than SQL databases.

For example, consider, if you are within world's top 100th user of
database in terms of database size, such as Google, then it may be
that the off-the-shelf tools may be limiting. But how many users
really have such massive size of data?

note that google's need for database today isn't just a seach engine.
It's db size for google search is probably larger than all the rest of
search engine company's sizes combined. Plus, there's youtube (vid
hosting), gmail, google code (source code hosting), google blog, orkut
(social networking), picasa (photo hosting), etc, each are all ranked
within top 5 or so with respective competitors in terms of number of
accounts... so, google's datasize is probably number one among the
world's user of databases, probably double or triple than the second
user with the most large datasize. At that point, it seems logical
that they need their own db, relational or not.

  Xah
? http://xahlee.org/

?

On Mar 4, 10:35?pm, John Nagle <na... at animats.com> wrote:
> Xah Lee wrote:
> > recently i wrote a blog article on The NoSQL Movement
> > athttp://xahlee.org/comp/nosql.html
>
> > i'd like to post it somewhere public to solicit opinions, but in the
> > 20 min or so, i couldn't find a proper newsgroup, nor private list
> > that my somewhat anti-NoSQL Movement article is fitting.
>
> ? ? Too much rant, not enough information.
>
> ? ? There is an argument against using full relational databases for
> some large-scale applications, ones where the database is spread over
> many machines. ?If the database can be organized so that each transaction
> only needs to talk to one database machine, the locking problems become
> much simpler. ?That's what BigTable is really about.
>
> ? ? For many web applications, each user has more or less their own data,
> and most database activity is related to a single user. ?Such
> applications can easily be scaled up with a system that doesn't
> have inter-user links. ?There can still be inter-user references,
> but without a consistency guarantee. ?They may lead to dead data,
> like Unix/Linux symbolic links. ?This is a mechanism adequate
> for most "social networking" sites.
>
> ? ? There are also some "consistent-eventually" systems, where a query
> can see old data. ?For non-critical applications, those can be
> very useful. ?This isn't a SQL/NoSQL thing; MySQL asynchronous
> replication is a "consistent-eventually" system. ?Wikipedia uses
> that for the "special" pages which require database lookups.
>
> ? ? If you allow general joins across any tables, you have to have all
> the very elaborate interlocking mechanisms of a distributed database.
> The serious database systems (MySQL Cluster and Oracle, for example)
> do offer that, but there are usually
> substantial complexity penalties, and the databases have to be carefully
> organized to avoid excessive cross-machine locking. ?If you don't need
> general joins, a system which doesn't support them is far simpler.
>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? John Nagle



From rolf.oltmans at gmail.com  Mon Mar  8 10:36:13 2010
From: rolf.oltmans at gmail.com (Oltmans)
Date: Mon, 8 Mar 2010 07:36:13 -0800 (PST)
Subject: Converting HTML to PDF using Python?
Message-ID: <1ca0597c-b5c7-496c-8636-2dd1359592be@y7g2000prc.googlegroups.com>

Hi Python superstars,

Guys, any ideas on how to convert HTML files to PDF files? Or as an
alternative, how to convert HTML files to an image file(jpeg/png/etc)?
Ideally, the converted PDF/Image file should like exactly like the way
HTML file looks in the browser.

I really have no idea about this so I will really appreciate all the
help. Thanks in advance and kindly pardon my ignorance.

Thanks,
Oltmans


From clp2 at rebertia.com  Mon Mar  8 11:16:45 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 8 Mar 2010 08:16:45 -0800
Subject: negative "counts" in collections.Counter?
In-Reply-To: <4b94ebbd$0$8762$c3e8da3@news.astraweb.com>
References: <mailman.437.1267995887.23598.python-list@python.org>
	<m2eijv4vtk.fsf@googlemail.com>
	<4b9456f4$0$8836$c3e8da3@news.astraweb.com>
	<e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com>
	<4b94ebbd$0$8762$c3e8da3@news.astraweb.com>
Message-ID: <50697b2c1003080816m46752277of34e9bf4bd9670d6@mail.gmail.com>

On Mon, Mar 8, 2010 at 4:21 AM, Steven D'Aprano <
steve at remove-this-cybersource.com.au> wrote:
> On Sun, 07 Mar 2010 22:31:00 -0800, Raymond Hettinger wrote:
>> On Mar 7, 5:46 pm, Steven D'Aprano <st... at REMOVE-THIS-
>> cybersource.com.au> wrote:
>>> Given that Counter supports negative counts, it looks to me that the
>>> behaviour of __add__ and __sub__ is fundamentally flawed. You should
>>> raise a bug report (feature enhancement) on the bug tracker.
>>
>> It isn't a bug.  I designed it that way. There were several possible
>> design choices, each benefitting different use cases.
<snip>
>> Instead the choice was to implement the four methods as multiset
>> operations.  As such, they need to correspond to regular set operations.
>
> Personally, I think the behaviour of + and - would be far less surprising
> if the class was called Multiset. Intuitively, one would expect counters
> to be limited to ints, and to support negative counts when adding and
> subtracting. In hindsight, do you think that Multiset would have been a
> better name?

Of course I'm not Raymond, but I'd encourage reading the original
announcement thread where that and related issues were discussed:
http://mail.python.org/pipermail/python-list/2009-January/1189466.html

To summarize the arguments against "Multiset":
* the API is primarily dict-like, not set-like
** related to this, len() and .items() don't behave in what is arguably an
"intuitive" way for multisets
* the API allows for negative counts; sets don't normally allow negative
multiplicities

The same pretty much also goes for why "Bag" wouldn't be an appropriate
name.

Finally, it leaves the names available for when a proper Bag/Multiset is
added. :)

Cheers,
Chris
--
http://blog.rebertia.com
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From sanelson at gmail.com  Mon Mar  8 12:06:25 2010
From: sanelson at gmail.com (Stephen Nelson-Smith)
Date: Mon, 8 Mar 2010 17:06:25 +0000
Subject: Trouble with quotes
Message-ID: <b6131fdc1003080906r7774df2ax7dbbc38af5133cf7@mail.gmail.com>

Hi,

I've written some (primitive) code to parse some apache logfies and
establish if apache has appended a session cookie to the end.  We're
finding that some browsers don't and apache doesn't just append a "-"
- it just omits it.

It's working fine, but for an edge case:

Couldn't match  192.168.1.107 - - [24/Feb/2010:20:30:44 +0100] "GET
http://sekrit.com/node/175523 HTTP/1.1" 200 -
"http://sekrit.com/search/results/"3%2B2%20course"" "Mozilla/4.0
(compatible; MSIE 6.0; Windows NT 5.1; SV1; GTB6.4)"
Couldn't match  192.168.1.107 - - [24/Feb/2010:20:31:15 +0100] "GET
http://sekrit.com/node/175521 HTTP/1.1" 200 -
"http://sekrit.com/search/results/"3%2B2%20course"" "Mozilla/4.0
(compatible; MSIE 6.0; Windows NT 5.1; SV1; GTB6.4)"
Couldn't match  192.168.1.107 - - [24/Feb/2010:20:32:07 +0100] "GET
http://sekrit.com/node/175520 HTTP/1.1" 200 -
"http://sekrit.com/search/results/"3%2B2%20course"" "Mozilla/4.0
(compatible; MSIE 6.0; Windows NT 5.1; SV1; GTB6.4)"
Couldn't match  192.168.1.107 - - [24/Feb/2010:20:32:33 +0100] "GET
http://sekrit.com/node/175522 HTTP/1.1" 200 -
"http://sekrit.com/search/results/"3%2B2%20course"" "Mozilla/4.0
(compatible; MSIE 6.0; Windows NT 5.1; SV1; GTB6.4)"
Couldn't match  192.168.1.107 - - [24/Feb/2010:20:33:01 +0100] "GET
http://sekrit.com/node/175527 HTTP/1.1" 200 -
"http://sekrit.com/search/results/"3%2B2%20course"" "Mozilla/4.0
(compatible; MSIE 6.0; Windows NT 5.1; SV1; GTB6.4)"
Couldn't match  192.168.1.107 - - [25/Feb/2010:17:01:54 +0100] "GET
http://sekrit.com/search/results/ HTTP/1.0" 200 -
"http://sekrit.com/search/results/"guideline%20grids"&page=1"
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR
1.1.4322; .NET CLR 2.0.50727)"
Couldn't match  192.168.1.107 - - [25/Feb/2010:17:02:15 +0100] "GET
http://sekrit.com/search/results/ HTTP/1.0" 200 -
"http://sekrit.com/search/results/"guideline%20grids"&page=1"
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR
1.1.4322; .NET CLR 2.0.50727)"

If there are " " inside the request string, my regex breaks.

Here's the code:

#!/usr/bin/env python
import re

pattern = r'(?P<ForwardedFor>^(-|[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}(,
[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3})*){1})
(?P<RemoteLogname>(\S*)) (?P<RemoteUser>(\S*))
(?P<Timestamp>(\[[^\]]+\]))
(?P<FirstLineOfRequest>(\"([^"\\]*(?:\\.[^"\\]*)*)\")?)
(?P<Status>(\S*)) (?P<Size>(\S*))
(?P<Referrer>(\"([^"\\]*(?:\\.[^"\\]*)*)\")?)
(?P<UserAgent>(\"([^"\\]*(?:\\.[^"\\]*)*)\")?)(
)?(?P<SiteIntelligenceCookie>(\"([^"\\]*(?:\\.[^"\\]*)*)\")?)'

regex = re.compile(pattern)

lines = 0
no_cookies = 0
unmatched = 0

for line in open('/home/stephen/scratch/test-data.txt'):
  lines +=1
  line = line.strip()
  match = regex.match(line)

  if match:
    data = match.groupdict()
    if data['SiteIntelligenceCookie'] == '':
      no_cookies +=1
  else:
    print "Couldn't match ", line
    unmatched +=1

print "I analysed %s lines." % (lines,)
print "There were %s lines with missing Site Intelligence cookies." %
(no_cookies,)
print "I was unable to process %s lines." % (unmatched,)

How can I make the regex a bit more resilient so it doesn't break when
" " is embedded?

-- 
Stephen Nelson-Smith
Technical Director
Atalanta Systems Ltd
www.atalanta-systems.com


From martin.hellwig at dcuktec.org  Mon Mar  8 12:40:07 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Mon, 08 Mar 2010 17:40:07 +0000
Subject: Trouble with quotes
In-Reply-To: <mailman.463.1268067986.23598.python-list@python.org>
References: <mailman.463.1268067986.23598.python-list@python.org>
Message-ID: <hn3cpn$fej$1@news.eternal-september.org>

On 03/08/10 17:06, Stephen Nelson-Smith wrote:
> Hi,
>
> I've written some (primitive) code to parse some apache logfies and
> establish if apache has appended a session cookie to the end.  We're
> finding that some browsers don't and apache doesn't just append a "-"
> - it just omits it.
>
> It's working fine, but for an edge case:
>
> Couldn't match  192.168.1.107 - - [24/Feb/2010:20:30:44 +0100] "GET
> http://sekrit.com/node/175523 HTTP/1.1" 200 -
> "http://sekrit.com/search/results/"3%2B2%20course"" "Mozilla/4.0
> (compatible; MSIE 6.0; Windows NT 5.1; SV1; GTB6.4)"
<cut rest>
I didn't try to mentally parse the regex pattern (I like to keep 
reasonably sane). However from the sounds of it the script barfs when 
there is a quoted part in the second URL part. So how about doing a 
simple string.replace('/"','') & string.replace('" ','') before doing 
your re foo?

-- 
mph


From cmpython at gmail.com  Mon Mar  8 12:51:51 2010
From: cmpython at gmail.com (CM)
Date: Mon, 8 Mar 2010 09:51:51 -0800 (PST)
Subject: Converting HTML to PDF using Python?
References: <1ca0597c-b5c7-496c-8636-2dd1359592be@y7g2000prc.googlegroups.com>
Message-ID: <4bd454b4-1f00-425a-aa37-cd3a63f7fe8f@z4g2000yqa.googlegroups.com>

On Mar 8, 10:36?am, Oltmans <rolf.oltm... at gmail.com> wrote:
> Hi Python superstars,
>
> Guys, any ideas on how to convert HTML files to PDF files? Or as an
> alternative, how to convert HTML files to an image file(jpeg/png/etc)?
> Ideally, the converted PDF/Image file should like exactly like the way
> HTML file looks in the browser.
>
> I really have no idea about this so I will really appreciate all the
> help. Thanks in advance and kindly pardon my ignorance.
>
> Thanks,
> Oltmans

http://lmgtfy.com/?q=python+html+to+pdf


From dinov at microsoft.com  Mon Mar  8 13:44:37 2010
From: dinov at microsoft.com (Dino Viehland)
Date: Mon, 8 Mar 2010 18:44:37 +0000
Subject: ssl, v23 client, v3 server...
Message-ID: <1A472770E042064698CB5ADC83A12ACD393F30FD@TK5EX14MBXC118.redmond.corp.microsoft.com>

In the ssl module docs (and in the tests) it says that if you have a client specifying PROTOCOL_SSLv23 (so it'll use v2 or v3) and a server specifying PROTOCOL_SSLv3 (so it'll only use v3) that you cannot connect between the two.  Why doesn't this end up using SSL v3 for the communication?


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From tjreedy at udel.edu  Mon Mar  8 13:48:01 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Mon, 08 Mar 2010 13:48:01 -0500
Subject: Converting HTML to PDF using Python?
In-Reply-To: <4bd454b4-1f00-425a-aa37-cd3a63f7fe8f@z4g2000yqa.googlegroups.com>
References: <1ca0597c-b5c7-496c-8636-2dd1359592be@y7g2000prc.googlegroups.com>
	<4bd454b4-1f00-425a-aa37-cd3a63f7fe8f@z4g2000yqa.googlegroups.com>
Message-ID: <hn3gou$36i$1@dough.gmane.org>

On 3/8/2010 12:51 PM, CM wrote:
> On Mar 8, 10:36 am, Oltmans<rolf.oltm... at gmail.com>  wrote:
>> Hi Python superstars,
>>
>> Guys, any ideas on how to convert HTML files to PDF files? Or as an
>> alternative, how to convert HTML files to an image file(jpeg/png/etc)?
>> Ideally, the converted PDF/Image file should like exactly like the way
>> HTML file looks in the browser.

How an HTML file looks in *a* (not *the*) browser depends on the 
browser, its settings, and window size. That is both a virtue and a 
reason for the invention of pdf format.

>> I really have no idea about this so I will really appreciate all the
>> help. Thanks in advance and kindly pardon my ignorance.
>>
>> Thanks,
>> Oltmans
>
> http://lmgtfy.com/?q=python+html+to+pdf




From debatem1 at gmail.com  Mon Mar  8 14:05:34 2010
From: debatem1 at gmail.com (geremy condra)
Date: Mon, 8 Mar 2010 14:05:34 -0500
Subject: Calculating very large exponents in python
In-Reply-To: <COL110-W1236CED756D3C9374CB0A2B7350@phx.gbl>
References: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>
	<f3cc57c61003071240x18b580bend946824ef7955b6c@mail.gmail.com>
	<COL110-W1236CED756D3C9374CB0A2B7350@phx.gbl>
Message-ID: <f3cc57c61003081105y43a2ef95u7699e7d65401fc8d@mail.gmail.com>

On Mon, Mar 8, 2010 at 2:15 AM, Fahad Ahmad <miraclesoul at hotmail.com> wrote:
> Thanks Geremy,
>
> That has been an absolute bump........... GOD i cant sit on my chair, it has
> worked even on 512 bit number and with no time..........
> superb i would say.
>
> lastly, i am using the code below to calculate Largest Prime factor of a
> number:
>
> print
> ('''==============================================================================='''
> ?????? '''????????????? CALCULATE? HIGHEST PRIME
> FACTOR????????????????????????????????? '''
>
> '''===============================================================================''')
>
> #!/usr/bin/env python
> def highest_prime_factor(n):
> ?? if isprime(n):
> ????? return n
> ?? for x in xrange(2,n ** 0.5 + 1):
> ????? if not n % x:
> ???????? return highest_prime_factor(n/x)
> def isprime(n):
> ?? for x in xrange(2,n ** 0.5 + 1):
> ????? if not n % x:
> ???????? return False
> ?? return True
> if? __name__ == "__main__":
> ?? import time
> ?? start = time.time()
> ?? print highest_prime_factor(1238162376372637826)
> ?? print time.time() - start
>
> the code works with a bit of delay on the number : "1238162376372637826" but
> extending it to
> (109026109913291424366305511581086089650628117463925776754560048454991130443047109026109913291424366305511581086089650628117463925776754560048454991130443047)
> ?makes python go crazy. Is there any way just like above, i can have it
> calculated it in no time.
>
>
> thanks for the support.

If you're just looking for the largest prime factor I would suggest using
a fermat factorization attack. In the example you gave, it returns
nearly immediately.

Geremy Condra


From debatem1 at gmail.com  Mon Mar  8 14:08:48 2010
From: debatem1 at gmail.com (geremy condra)
Date: Mon, 8 Mar 2010 14:08:48 -0500
Subject: Calculating very large exponents in python
In-Reply-To: <f3cc57c61003081105y43a2ef95u7699e7d65401fc8d@mail.gmail.com>
References: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>
	<f3cc57c61003071240x18b580bend946824ef7955b6c@mail.gmail.com>
	<COL110-W1236CED756D3C9374CB0A2B7350@phx.gbl>
	<f3cc57c61003081105y43a2ef95u7699e7d65401fc8d@mail.gmail.com>
Message-ID: <f3cc57c61003081108w43f9d50l1be41ffd827ac1dd@mail.gmail.com>

On Mon, Mar 8, 2010 at 2:05 PM, geremy condra <debatem1 at gmail.com> wrote:
> On Mon, Mar 8, 2010 at 2:15 AM, Fahad Ahmad <miraclesoul at hotmail.com> wrote:
>> Thanks Geremy,
>>
>> That has been an absolute bump........... GOD i cant sit on my chair, it has
>> worked even on 512 bit number and with no time..........
>> superb i would say.
>>
>> lastly, i am using the code below to calculate Largest Prime factor of a
>> number:
>>
>> print
>> ('''==============================================================================='''
>> ?????? '''????????????? CALCULATE? HIGHEST PRIME
>> FACTOR????????????????????????????????? '''
>>
>> '''===============================================================================''')
>>
>> #!/usr/bin/env python
>> def highest_prime_factor(n):
>> ?? if isprime(n):
>> ????? return n
>> ?? for x in xrange(2,n ** 0.5 + 1):
>> ????? if not n % x:
>> ???????? return highest_prime_factor(n/x)
>> def isprime(n):
>> ?? for x in xrange(2,n ** 0.5 + 1):
>> ????? if not n % x:
>> ???????? return False
>> ?? return True
>> if? __name__ == "__main__":
>> ?? import time
>> ?? start = time.time()
>> ?? print highest_prime_factor(1238162376372637826)
>> ?? print time.time() - start
>>
>> the code works with a bit of delay on the number : "1238162376372637826" but
>> extending it to
>> (109026109913291424366305511581086089650628117463925776754560048454991130443047109026109913291424366305511581086089650628117463925776754560048454991130443047)
>> ?makes python go crazy. Is there any way just like above, i can have it
>> calculated it in no time.
>>
>>
>> thanks for the support.
>
> If you're just looking for the largest prime factor I would suggest using
> a fermat factorization attack. In the example you gave, it returns
> nearly immediately.
>
> Geremy Condra
>

Allow me to add a very important caveat to my previous statement:
a fermat factorization is primarily useful if you know that your number
is a large semiprime, such as an RSA modulus, which I assume you
are. Otherwise, make sure and test for primality.

Geremy Con


From duncan.booth at invalid.invalid  Mon Mar  8 14:14:37 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 8 Mar 2010 19:14:37 GMT
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<4b90a1f8$0$1629$742ec2ed@news.sonic.net>
	<0d381135-730a-45e4-9225-9ba2a29b77fe@k2g2000pro.googlegroups.com>
Message-ID: <Xns9D35C3BFCE829duncanbooth@127.0.0.1>

Xah Lee <xahlee at gmail.com> wrote:

> For example, consider, if you are within world's top 100th user of
> database in terms of database size, such as Google, then it may be
> that the off-the-shelf tools may be limiting. But how many users
> really have such massive size of data?

You've totally missed the point. It isn't the size of the data you have 
today that matters, it's the size of data you could have in several years' 
time.

Maybe today you've got 10 users each with 10 megabytes of data, but you're 
aspiring to become the next twitter/facebook or whatever. It's a bit late 
as you approach 100 million users (and a petabyte of data) to discover that 
your system isn't scalable: scalability needs to be built in from day one.


From bob.aalsma at aalsmacons.nl  Mon Mar  8 14:15:32 2010
From: bob.aalsma at aalsmacons.nl (BobAalsma)
Date: Mon, 8 Mar 2010 11:15:32 -0800 (PST)
Subject: Newbie question: python versions differ per user?
Message-ID: <8a04bbfd-9c48-4397-8c81-c159dc1b8977@33g2000yqj.googlegroups.com>

I'm on Mac OS X 10.5.8 and downloaded 2.6.4 Mac Installer Disk Image
as/in(?) the sys admin user. For this user Pyhton 2.6.4 is now the
current version.
I want to use Python outside the sys asdmin user. However, all other
users still use Python 2.5.1 (Apple delivered).

The sys admin user looks in /Library/Frameworks/Python.framework/
Versions/2.6/lib/...
The other users look in        /System/Library/Frameworks/
Python.framework/Version/2.5/lib/...

I could not find any questions on this matter, so am I the only one?
Did I do something wrong?
I assumed the paths for all users would be modified - too easy?


From dickinsm at gmail.com  Mon Mar  8 14:21:14 2010
From: dickinsm at gmail.com (Mark Dickinson)
Date: Mon, 8 Mar 2010 11:21:14 -0800 (PST)
Subject: Calculating very large exponents in python
References: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>
	<mailman.435.1267994462.23598.python-list@python.org>
Message-ID: <b7fbee2f-4a89-45b9-8904-4cb63a91adba@o3g2000yqb.googlegroups.com>

[Replying to Geremy's reply because the OP's post didn't show up in my
newsreader.]
On Mar 7, 8:40?pm, geremy condra <debat... at gmail.com> wrote:
> On Sun, Mar 7, 2010 at 1:55 PM, Fahad Ahmad <miracles... at hotmail.com> wrote:
> > Dear All,
>
> > i am writing my crytographic scheme in python, i am just a new user to it.
> > I have written the complete code, the only point i am stuck it is that i am
> > using 256 exponentiation which is normal in crytography but python just
> > hangs on it.
>
> > g**x? [where both g and x are 256 bit numbers , in decimal they are around
> > 77]

No library can solve this problem.  If g and x are both 256-bit
numbers then the result of g**x will have on the order of 10**79 bits,
which matches estimates of the number of particles in the universe.  I
can only imagine that you actually want g**x % m for some m, in which
case three-argument pow is your friend, as Geremy pointed out.

--
Mark


From python at rcn.com  Mon Mar  8 14:24:02 2010
From: python at rcn.com (Raymond Hettinger)
Date: Mon, 8 Mar 2010 11:24:02 -0800 (PST)
Subject: negative "counts" in collections.Counter?
References: <mailman.437.1267995887.23598.python-list@python.org> 
	<m2eijv4vtk.fsf@googlemail.com>
	<4b9456f4$0$8836$c3e8da3@news.astraweb.com> 
	<e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com> 
	<4b94ebbd$0$8762$c3e8da3@news.astraweb.com>
Message-ID: <06ddd3cf-d3dd-4e5d-9789-53a4f8a4bced@b5g2000prd.googlegroups.com>

[Steven D'Aprano]
> Thanks for the explanation Raymond. A few comments follow:

You're welcome :-)


> Would you consider a feature enhancement adding an additional method,
> analogous to update(), to perform subtractions? I recognise that it's
> easy to subclass and do it yourself, but there does seem to be some
> demand for it, and it is an obvious feature given that Counter does
> support negative counts.

Will continue to mull it over.

Instinct says that conflating two models can be worse for usability
than just picking one of the models and excluding the other.

If I had it to do over, there is a reasonable case that elementwise
vector methods (__add__, __sub__, and __mul__) may have been a more
useful choice than multiset methods (__add__, __sub__, __and__,
__or__).

That being said, the multiset approach was the one that was chosen.
It was indicated for people who have experience with bags or
multisets in other languages.   It was also consistent with the naming
of the class as tool for counting things (i.e. it handles counting
numbers right out of the box).  No explicit support is provided
for negative values, but it isn't actively hindered either.

For applications needing elementwise vector operations and signed
arithmetic, arguably they should be using a more powerful toolset,
perhaps supporting a full-range of elementwise binary and unary
operations and a dotproduct() method.  Someone should write that
class and post it to the ASPN Cookbook to see if there is any uptake.


> Personally, I think the behaviour of + and - would be far less surprising
> if the class was called Multiset. Intuitively, one would expect counters
> to be limited to ints, and to support negative counts when adding and
> subtracting. In hindsight, do you think that Multiset would have been a
> better name?

The primary use case for Counter() is to count things (using the
counting numbers).
The term Multiset is more obscure and only applies
to the four operations that eliminate non-positive results.
So, I'm somewhat happy with the current name.

FWIW, the notion of "what is surprising" often depends on the
observer's
background and on the problem they are currently trying to solve.
If you need negative counts, then Counter.__sub__() is surprising.
If your app has no notion of a negative count, then it isn't.
The docs, examples, and docstrings are very clear about the behavior,
so the "surprise" is really about wanting it to do something other
than what it currently does ;-)


Raymond





From daniel at stutzbachenterprises.com  Mon Mar  8 15:30:23 2010
From: daniel at stutzbachenterprises.com (Daniel Stutzbach)
Date: Mon, 8 Mar 2010 14:30:23 -0600
Subject: negative "counts" in collections.Counter?
In-Reply-To: <06ddd3cf-d3dd-4e5d-9789-53a4f8a4bced@b5g2000prd.googlegroups.com>
References: <mailman.437.1267995887.23598.python-list@python.org>
	<m2eijv4vtk.fsf@googlemail.com>
	<4b9456f4$0$8836$c3e8da3@news.astraweb.com>
	<e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com>
	<4b94ebbd$0$8762$c3e8da3@news.astraweb.com>
	<06ddd3cf-d3dd-4e5d-9789-53a4f8a4bced@b5g2000prd.googlegroups.com>
Message-ID: <eae285401003081230t280dbfc8q84cccca8bbb9da12@mail.gmail.com>

On Mon, Mar 8, 2010 at 1:24 PM, Raymond Hettinger <python at rcn.com> wrote:

> Instinct says that conflating two models can be worse for usability
> than just picking one of the models and excluding the other.
>

Toward that end, shouldn't Counter do one (and only one) of the follow?
1) Disallow non-positive counts (like a Multiset/Bag)
2) Allow them when subtracting

In other words, to avoid conflating two models the following two examples
should produce the same output:

>>> c = Counter({'red': 1})
>>> c['red'] -= 2
>>> c
Counter({'red': -1})

>>> c = Counter({'red': 1})
>>> c2 = Counter({'red': 2})
>>> c - c2
Counter()

--
Daniel Stutzbach, Ph.D.
President, Stutzbach Enterprises, LLC <http://stutzbachenterprises.com>
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From monkey at joemoney.net  Mon Mar  8 15:30:39 2010
From: monkey at joemoney.net (monkeys paw)
Date: Mon, 08 Mar 2010 15:30:39 -0500
Subject: write to remote ile
In-Reply-To: <hn1ork$edf$1@news.eternal-september.org>
References: <WpqdnTgN4vzhwQnWnZ2dnUVZ_tOdnZ2d@insightbb.com>
	<hn1msv$95d$1@news.eternal-september.org>
	<f--dnSFN38yw-wnWnZ2dnUVZ_gadnZ2d@insightbb.com>
	<hn1ork$edf$1@news.eternal-september.org>
Message-ID: <l4idnYQzYrbuwwjWnZ2dnUVZ_qudnZ2d@insightbb.com>

On 3/7/2010 9:53 PM, Martin P. Hellwig wrote:
> On 03/08/10 02:51, monkeys paw wrote:
>> On 3/7/2010 9:20 PM, Martin P. Hellwig wrote:
>>> On 03/08/10 02:10, monkeys paw wrote:
>>>> I can xfer a file from a remote server using:
>>>>
>>>> import urllib2 as u
>>>> x=u.urlopen('http://tycho.usno.navy.mil/cgi-bin/timer.pl')
>>>>
>>>> for line in x:
>>>> print line
>>>>
>>>>
>>>> How can i write a file to the remote server?
>>>>
>>>> I tried:
>>>>
>>>> x = u.url.open('http://joemoney.net/somefile.txt', 'w')
>>>>
>>>> but that does not work
>>>
>>> How do you normally (i.e. without python) put files on a remote server?
>>>
>> Using FTP, i'm really having a brain cramp here, but i'm new to python
>
> We all been there, in some for or other ;-), anyway you might want to
> have a look at this:
> http://docs.python.org/library/ftplib.html
>

Tried this, the storlines doesn't work, everything else OK

from ftplib import FTP
ftp = FTP('joemoney.net')
ftp.login('secret','pw')
ftp.retrlines('LIST')     # list directory contents
ftp.storlines('STOR', 'sf.xml')   # Is this incorrect, it throws error>

   File "ftp.py", line 5, in <module>
     ftp.storlines('STOR', 'sf.xml')
   File "C:\Python26\lib\ftplib.py", line 470, in storlines
     conn = self.transfercmd(cmd)
   File "C:\Python26\lib\ftplib.py", line 356, in transfercmd
     return self.ntransfercmd(cmd, rest)[0]
   File "C:\Python26\lib\ftplib.py", line 327, in ntransfercmd
     resp = self.sendcmd(cmd)
   File "C:\Python26\lib\ftplib.py", line 243, in sendcmd
     return self.getresp()
   File "C:\Python26\lib\ftplib.py", line 218, in getresp
     raise error_perm, resp
ftplib.error_perm: 501 No file name


The file exists in the same directory as ftp.py


From python at rcn.com  Mon Mar  8 16:44:34 2010
From: python at rcn.com (Raymond Hettinger)
Date: Mon, 8 Mar 2010 13:44:34 -0800 (PST)
Subject: negative "counts" in collections.Counter?
References: <mailman.437.1267995887.23598.python-list@python.org> 
	<m2eijv4vtk.fsf@googlemail.com>
	<4b9456f4$0$8836$c3e8da3@news.astraweb.com> 
	<e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com> 
	<mailman.455.1268046813.23598.python-list@python.org>
Message-ID: <feea9592-5625-4ddf-befe-490183f34ab0@d2g2000yqa.googlegroups.com>

[Vlastimil Brom]
> Thank you very much for the exhaustive explanation Raymond!

You're welcome.


> I am by far not able to follow all of the mathematical background, but
> even for zero-truncating multiset, I would expect the truncation on
> input rather than on output of some operations.

I debated about this and opted for be-loose-in-receiving-and-strict-on-
output.
One thought is that use cases for multisets would have real multisets
as inputs (no negative counts) and as outputs.  The user controls
the inputs, and the method only has a say in what its outputs are.

Also, truncating input would complicate the mathematical definition
of
what is happening.  Compare:

    r = a[x] - b[x]
    if r > 0:
        emit(r)

vs.

    r = max(0, a[x]) - max(0, b[x])
    if r > 0:
        emit(r)

Also, the design parallels what is done in the decimal module
where rounding is applied only to the results of operations,
not to the inputs.


> Probably a kind of negative_update() ?or some better named method will
> be handy, like the one you supplied or simply the current module code
> without the newcount > 0: ... condition.

See my other post on this subject.  There is no doubt that
such a method would be handy for signed arithmetic.
The question is whether conflating two different models hurts
the API more than it helps.  Right now, the Counter() class
has no explicit support for negative values.  It is
designed around natural numbers and counting numbers.


> Or would it be an option to
> have a keyword argument like zero_truncate=False which would influence
> this behaviour?

Guido's thoughts on behavior flags is that they are usually a signal
that you need two different classes.  That is why itertools has
ifilter() and ifilterfalse() or izip() and izip_longest() instead
of having behavior flags.

In this case, we have an indication that what you really want is
a separate class supporting elementwise binary and unary operations
on vectors (where the vector fields are accessed by a dictionary
key instead of a positional value).


> Additionally, were issubset and issuperset considered for this
> interface (not sure whether symmetric_difference would be applicable)?

If the need arises, these could be included.  Right now, you
can get the same result with:  "if a - b: ..."

FWIW, I never liked those two method names.  Can't remember whether
a.issubset(b) means "a is a subset of b" or "b issubset of a'.


Raymond


From news123 at free.fr  Mon Mar  8 17:06:34 2010
From: news123 at free.fr (News123)
Date: Mon, 08 Mar 2010 23:06:34 +0100
Subject: Import problem
In-Reply-To: <4b926b37$0$27829$c3e8da3@news.astraweb.com>
References: <6630f859-b85d-4841-b1d5-2a563dca9cbb@q15g2000yqj.googlegroups.com>
	<4b926b37$0$27829$c3e8da3@news.astraweb.com>
Message-ID: <4b9574ea$0$435$426a74cc@news.free.fr>

Hi Steven,

Steven D'Aprano wrote:
> On Sat, 06 Mar 2010 03:53:53 -0800, Johny wrote:
>
>>>>> import sys
>>>>> sys.path.append('C:\\A')
>>>>> from A.B import bmodule
>> Traceback (most recent call last):
>>   File "<stdin>", line 1, in <module>
>> ImportError: No module named A.B
>
> The current directory is irrelevant, except that it is automatically
> added to the PYTHONPATH. That's why you can import A.B when the current
> directory is C.

Minor currection:

It doesn't seem to be the current directory, but the directory, where
the script is located in, which is auto-appended to the pythonpath

Please see following example:

$ python -V
Python 2.6.4

$ mkdir A

$ touch A/__init__

$ # create A/blla.py an A/blo.py

$ cat A/bla.py
print "I am bla"
import A.blo
print "and I found blo",dir(A.blo)
$ cat A/blo.py
avar = 3
print "I am blo"

$ python A/bla.py
I am bla
Traceback (most recent call last):
  File "A/bla.py", line 2, in <module>
    import A.blo
ImportError: No module named A.blo



However:
$ cat alternative_bla.py
import sys
sys.path.append(".")
print "I am bla"
import A.blo
print "and I found blo",dir(A.blo)

$ python A/alternativ_bla.py
I am bla
I am blo
and I found blo ['__builtins__', '__doc__', '__file__', '__name__',
'__package__', 'avar']


bye N


From greg.ewing at canterbury.ac.nz  Mon Mar  8 17:16:24 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Tue, 09 Mar 2010 11:16:24 +1300
Subject: Reverse engineering CRC?
In-Reply-To: <mailman.459.1268053659.23598.python-list@python.org>
References: <7vj7fdFnnjU1@mid.individual.net>	<4b9471ee$0$8836$c3e8da3@news.astraweb.com>	<7vk3eiFtivU1@mid.individual.net>
	<mailman.459.1268053659.23598.python-list@python.org>
Message-ID: <7vlameF7goU1@mid.individual.net>

Dave Angel wrote:
> If you know so little about the 
> value, how do you even know it's a CRC ?  Could it be a ones-complement 
> sum, such as used in Ethernet?

I'm going by the fact that the application reports a
"CRC mismatch" when it's wrong. I can't be sure that what
it calls a "CRC" is really a true CRC, but it's more than
a simple sum, because changing one bit in the file results
in a completely different value.

> Is the problem really worth it?

Probably not -- it looks like fixing the problem I'm trying
to fix by hand will be faster in the long run. I just thought
it might turn out to be a solved problem and someone could
point me to an algorithm for it, but it seems not.

-- 
Greg


From news123 at free.fr  Mon Mar  8 17:21:08 2010
From: news123 at free.fr (News123)
Date: Mon, 08 Mar 2010 23:21:08 +0100
Subject: Import problem
In-Reply-To: <mailman.460.1268053858.23598.python-list@python.org>
References: <6630f859-b85d-4841-b1d5-2a563dca9cbb@q15g2000yqj.googlegroups.com>
	<mailman.460.1268053858.23598.python-list@python.org>
Message-ID: <4B957854.3070201@free.fr>

Jean-Michel Pichavant wrote:
> Johny wrote:
>> I have this directory structure
>>
>> C:
>>       \A
>>          __init__.py
>>          amodule.py
>>
>>          \B
>>           __init__.py
>>           bmodule.py
>>
>>            \D
>>             __init__.py
>>             dmodule.py
>>
>> and  I want to import  bmodule.py
>> C:\>cd \
>>
>> C:\>python
>> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
>> (Intel)] on win
>> 32
>> Type "help", "copyright", "credits" or "license" for more information.
>>  
>>>>> from A.B import  bmodule
>>>>>         
>> I am bmodule
>>   C:\>
>>
>> so far so good. Now I would like to import bmodule but if the current
>> directory is \D subdirectory.
>>
>> C:> cd \A\B\D
>> C:\A\B\D>
>> C:\A\B\D>python
>> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
>> (Intel)] on win
>> 32
>> Type "help", "copyright", "credits" or "license" for more information.
>>  
>>>>> import sys
>>>>> sys.path.append('C:\\A')
>>>>> from A.B import bmodule
>>>>>         
>> Traceback (most recent call last):
>>   File "<stdin>", line 1, in <module>
>> ImportError: No module named A.B
>>
>> C:\>
>>
>> so I can not import a module from the parent directory? Or where did I
>> make an error?
>> Thanks for help
>>
>> L.
>>   
> try
> 
> import sys
> sys.path.append('C:\\')
> from A.B import bmodule
> 
is there any 'automatic' way of finding the top level
directory?basically the 'top level directory is the first directory
going upwards, that doesn't contain a __init__.py file.

of course you could do this 'manually' by
doing:

# assume, that this module is A.amodule
import sys
import os

# I'd love to have a similiar automatic construct
if __name__ == "__main__":
    level = 1 # or function locating how far to go up before
              # finding a dir, whcih does not contain a __init__.py
    mydir = os.path.split(__file__)[0]
    topdir = os.path.join( mydir,*(("..",)*level))
    abstop = os.path.abspath(topdir)
    sys.path.append(abstop)

## now you can import with the normal module paths

import A.blo
print "and I found blo",dir(A.blo)


bye N





From news123 at free.fr  Mon Mar  8 17:21:26 2010
From: news123 at free.fr (News123)
Date: Mon, 08 Mar 2010 23:21:26 +0100
Subject: Import problem
In-Reply-To: <mailman.460.1268053858.23598.python-list@python.org>
References: <6630f859-b85d-4841-b1d5-2a563dca9cbb@q15g2000yqj.googlegroups.com>
	<mailman.460.1268053858.23598.python-list@python.org>
Message-ID: <4b957866$0$17135$426a34cc@news.free.fr>

Jean-Michel Pichavant wrote:
> Johny wrote:
>> I have this directory structure
>>
>> C:
>>       \A
>>          __init__.py
>>          amodule.py
>>
>>          \B
>>           __init__.py
>>           bmodule.py
>>
>>            \D
>>             __init__.py
>>             dmodule.py
>>
>> and  I want to import  bmodule.py
>> C:\>cd \
>>
>> C:\>python
>> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
>> (Intel)] on win
>> 32
>> Type "help", "copyright", "credits" or "license" for more information.
>>  
>>>>> from A.B import  bmodule
>>>>>         
>> I am bmodule
>>   C:\>
>>
>> so far so good. Now I would like to import bmodule but if the current
>> directory is \D subdirectory.
>>
>> C:> cd \A\B\D
>> C:\A\B\D>
>> C:\A\B\D>python
>> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
>> (Intel)] on win
>> 32
>> Type "help", "copyright", "credits" or "license" for more information.
>>  
>>>>> import sys
>>>>> sys.path.append('C:\\A')
>>>>> from A.B import bmodule
>>>>>         
>> Traceback (most recent call last):
>>   File "<stdin>", line 1, in <module>
>> ImportError: No module named A.B
>>
>> C:\>
>>
>> so I can not import a module from the parent directory? Or where did I
>> make an error?
>> Thanks for help
>>
>> L.
>>   
> try
> 
> import sys
> sys.path.append('C:\\')
> from A.B import bmodule
> 
is there any 'automatic' way of finding the top level
directory?basically the 'top level directory is the first directory
going upwards, that doesn't contain a __init__.py file.

of course you could do this 'manually' by
doing:

# assume, that this module is A.amodule
import sys
import os

# I'd love to have a similiar automatic construct
if __name__ == "__main__":
    level = 1 # or function locating how far to go up before
              # finding a dir, whcih does not contain a __init__.py
    mydir = os.path.split(__file__)[0]
    topdir = os.path.join( mydir,*(("..",)*level))
    abstop = os.path.abspath(topdir)
    sys.path.append(abstop)

## now you can import with the normal module paths

import A.blo
print "and I found blo",dir(A.blo)


bye N





From greg.ewing at canterbury.ac.nz  Mon Mar  8 17:22:28 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Tue, 09 Mar 2010 11:22:28 +1300
Subject: negative "counts" in collections.Counter?
In-Reply-To: <e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com>
References: <mailman.437.1267995887.23598.python-list@python.org>
	<m2eijv4vtk.fsf@googlemail.com>
	<4b9456f4$0$8836$c3e8da3@news.astraweb.com>
	<e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com>
Message-ID: <7vlb1qF9jaU1@mid.individual.net>

Raymond Hettinger wrote:

> Instead the choice was to implement the four methods as
> multiset operations.  As such, they need to correspond
> to regular set operations.

Seems to me you're trying to make one data type do the
work of two, and ending up with something inconsistent.

I think you should be providing two types: one is a
multiset, which disallows negative counts altogether;
the other behaves like a sparse vector with appropriate
arithmetic operations.

-- 
Greg


From vlastimil.brom at gmail.com  Mon Mar  8 17:24:43 2010
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Mon, 8 Mar 2010 23:24:43 +0100
Subject: negative "counts" in collections.Counter?
In-Reply-To: <feea9592-5625-4ddf-befe-490183f34ab0@d2g2000yqa.googlegroups.com>
References: <mailman.437.1267995887.23598.python-list@python.org>
	<m2eijv4vtk.fsf@googlemail.com>
	<4b9456f4$0$8836$c3e8da3@news.astraweb.com>
	<e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com>
	<mailman.455.1268046813.23598.python-list@python.org>
	<feea9592-5625-4ddf-befe-490183f34ab0@d2g2000yqa.googlegroups.com>
Message-ID: <9fdb569a1003081424j405d2bdblc2dc96a5ae6fa910@mail.gmail.com>

2010/3/8 Raymond Hettinger <python at rcn.com>:
...
[snip detailed explanations]
>...
> In this case, we have an indication that what you really want is
> a separate class supporting elementwise binary and unary operations
> on vectors (where the vector fields are accessed by a dictionary
> key instead of a positional value).
>
>
>> Additionally, were issubset and issuperset considered for this
>> interface (not sure whether symmetric_difference would be applicable)?
>
> If the need arises, these could be included. ?Right now, you
> can get the same result with: ?"if a - b: ..."
>
> FWIW, I never liked those two method names. ?Can't remember whether
> a.issubset(b) means "a is a subset of b" or "b issubset of a'.
>
>
> Raymond
> --
>
Thanks for the further remarks Raymond,
initially I thought while investigating new features of python 3, this
would be a case for replacing the "home made" solutions with the
standard module functionality.
Now I can see, it probably wouldn't be an appropriate decision in this
case, as the expected usage of Counter with its native methods is
different.

As for the issubset, issuperset method names, I am glad, a far more
skilled person has the same problem like me :-)   In this case the
operators appear to be clearer than the method names...

regards,
   vbr


From news123 at free.fr  Mon Mar  8 17:25:24 2010
From: news123 at free.fr (News123)
Date: Mon, 08 Mar 2010 23:25:24 +0100
Subject: libc Sleep api performs a busy waiting
In-Reply-To: <mailman.457.1268051709.23598.python-list@python.org>
References: <a52b97c0-7266-4bc6-9ab4-3a8688120a6c@u19g2000prh.googlegroups.com>
	<mailman.457.1268051709.23598.python-list@python.org>
Message-ID: <4b957954$0$17135$426a34cc@news.free.fr>

Hi Steve,

Steve Holden wrote:
> Mahesh wrote:
>> Hi,
>>
>>  I am having a problem while using sleep function from libc , the
>> thread in which i am calling it is getting struck and not allowing
>> other threads to execute.  Here is a simple code that i am trying to
>> exeute
>>
>> import threading
>> import time
>> import dl
>>
>>
>> def dummy1():
>>     a=dl.open('/lib/libc.so.6')
>>     print "in thread 1 Start"
>>     a.call('sleep',2)
>>     #time.sleep(2)
>>     print "in thread 1 End"
>>
>> def dummy2():
>>     print "in thread 2 Start"
>>     time.sleep(1)
>>     print "in thread 2 End"
>> newThread1=threading.Thread(None,dummy1)
>> newThread2=threading.Thread(None,dummy2)
>> newThread1.start()
>> newThread2.start()
>>
>> print "in main"
>>
>>
>>
>> The out put of this program is  (In this case thread 1 even though i
>> am calling a sleep function its not allowing other threads to execute,
>> other threads execute only after the completion of first thread)
>>
>> in thread 1 Start
>> in thread 1 End
>> in thread 2 Start
>> in main
>> in thread 2 End
>>
>>
>> where as if i use time.sleep instead of a.call(sleep) the out put is
>> (which i guess is right behaviour, because it start the threads and
>> suspends them because the have sleep , and continue executing the main
>> thread)
>> in thread 1 Start
>> in thread 2 Start
>> in main
>> in thread 2 End
>> in thread 1 End
>>
>>
> Why not just use the time module's sleep function? Unlike the libc code
> it releases Python's GIL (global interpreter lock), thus allowing other
> threads to run.
> 
I fully agree for the given example.
Especcially time.sleep allows even sub second sleeps.

Out of curiousity though:

Is there any way to perform a call(), that releases the GIL before
calling  the function?

It would avoid writing a wrapper?


bye


N


From news123 at free.fr  Mon Mar  8 17:26:32 2010
From: news123 at free.fr (News123)
Date: Mon, 08 Mar 2010 23:26:32 +0100
Subject: What to do if anything bites.
In-Reply-To: <dbf9320f-a9b9-492c-9a5e-c687422c1464@y7g2000prc.googlegroups.com>
References: <dbf9320f-a9b9-492c-9a5e-c687422c1464@y7g2000prc.googlegroups.com>
Message-ID: <4b957998$0$17135$426a34cc@news.free.fr>

Google Adsense wrote:
> What to do if anything bites.
> 
> Check our bites treatment at
> 
> http://108ambulance.blogspot.com/2010/03/108-ambulance-home-page.html

Pythons don't bite


From dimitri.pater at gmail.com  Mon Mar  8 17:34:06 2010
From: dimitri.pater at gmail.com (dimitri pater - serpia)
Date: Mon, 8 Mar 2010 23:34:06 +0100
Subject: related lists mean value
Message-ID: <e75321bd1003081434m27373b1esae82712d055c07c3@mail.gmail.com>

Hi,

I have two related lists:
x = [1 ,2, 8, 5, 0, 7]
y = ['a', 'a', 'b', 'c', 'c', 'c' ]

what I need is a list representing the mean value of 'a', 'b' and 'c'
while maintaining the number of items (len):
w = [1.5, 1.5, 8, 4, 4, 4]

I have looked at iter(tools) and next(), but that did not help me. I'm
a bit stuck here, so your help is appreciated!

thanks!
Dimitri


From python at rcn.com  Mon Mar  8 17:44:38 2010
From: python at rcn.com (Raymond Hettinger)
Date: Mon, 8 Mar 2010 14:44:38 -0800 (PST)
Subject: negative "counts" in collections.Counter?
References: <mailman.437.1267995887.23598.python-list@python.org> 
	<m2eijv4vtk.fsf@googlemail.com>
	<4b9456f4$0$8836$c3e8da3@news.astraweb.com> 
	<e4a4df2d-9c29-4f3f-bfcb-08baeb9a14ec@u5g2000prd.googlegroups.com> 
	<7vlb1qF9jaU1@mid.individual.net>
Message-ID: <34e15f30-8f7c-4f0f-82b7-6a65fe91ec88@w27g2000pre.googlegroups.com>

[Gregory Ewing]
> I think you should be providing two types: one is a
> multiset, which disallows negative counts altogether;
> the other behaves like a sparse vector with appropriate
> arithmetic operations.


That is pretty close to what I said above:

"""
In this case, we have an indication that what you really want is a
separate class supporting elementwise binary and unary operations on
vectors (where the vector fields are accessed by a dictionary key
instead of a positional value).
"""

The first and foremost goal of the class was to provide a simple
counting capability along the lines of:

    class Counter(dict):
       def __init__(self, iterable=()):
            for elem in iterable:
                self[elem] += 1
       def __missing__(self, key):
            return 0

Note, there is no "disallowing negatives" or even any insistence
that the "counts" are actually numbers.  In that respect, it was
a consenting adults class from the start.  It is short, simple,
and fast.

The other methods were mostly just "extras" to make the tool
more useful.  Each adds its own minimal restrictions:

   elements() requires integer counts
   most_common() requires that counts be orderable
   multiset operations are defined for non-negative values

We could have kept this same design and wrapped every dictionary
method so that it would raise an exception for any count that was not
a positive integer.  That would have slowed down the class, increased
the code volume, and precluded some uses that are currently possible.
IMO, that would not have been a win and it would not have helped the
OP who was seeking a more vector-like tool for signed-number
operations.

Anyway, it is what it is.  The tool is released and most
users seem to be happy with what we have.


Raymond


From python at mrabarnett.plus.com  Mon Mar  8 17:48:13 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Mon, 08 Mar 2010 22:48:13 +0000
Subject: write to remote ile
In-Reply-To: <l4idnYQzYrbuwwjWnZ2dnUVZ_qudnZ2d@insightbb.com>
References: <WpqdnTgN4vzhwQnWnZ2dnUVZ_tOdnZ2d@insightbb.com>	<hn1msv$95d$1@news.eternal-september.org>	<f--dnSFN38yw-wnWnZ2dnUVZ_gadnZ2d@insightbb.com>	<hn1ork$edf$1@news.eternal-september.org>
	<l4idnYQzYrbuwwjWnZ2dnUVZ_qudnZ2d@insightbb.com>
Message-ID: <4B957EAD.7070304@mrabarnett.plus.com>

monkeys paw wrote:
> On 3/7/2010 9:53 PM, Martin P. Hellwig wrote:
>> On 03/08/10 02:51, monkeys paw wrote:
>>> On 3/7/2010 9:20 PM, Martin P. Hellwig wrote:
>>>> On 03/08/10 02:10, monkeys paw wrote:
>>>>> I can xfer a file from a remote server using:
>>>>>
>>>>> import urllib2 as u
>>>>> x=u.urlopen('http://tycho.usno.navy.mil/cgi-bin/timer.pl')
>>>>>
>>>>> for line in x:
>>>>> print line
>>>>>
>>>>>
>>>>> How can i write a file to the remote server?
>>>>>
>>>>> I tried:
>>>>>
>>>>> x = u.url.open('http://joemoney.net/somefile.txt', 'w')
>>>>>
>>>>> but that does not work
>>>>
>>>> How do you normally (i.e. without python) put files on a remote server?
>>>>
>>> Using FTP, i'm really having a brain cramp here, but i'm new to python
>>
>> We all been there, in some for or other ;-), anyway you might want to
>> have a look at this:
>> http://docs.python.org/library/ftplib.html
>>
> 
> Tried this, the storlines doesn't work, everything else OK
> 
> from ftplib import FTP
> ftp = FTP('joemoney.net')
> ftp.login('secret','pw')
> ftp.retrlines('LIST')     # list directory contents
> ftp.storlines('STOR', 'sf.xml')   # Is this incorrect, it throws error>
> 
The documentation says:

     FTP.storlines(cmd, file, callback=None)

where 'cmd' is the FTP command, 'STOR sf.xml' ('sf.xl' is the path of
the file on the server) and 'file' is the open (local) source file.


From invalid at invalid.invalid  Mon Mar  8 18:06:35 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Mon, 8 Mar 2010 23:06:35 +0000 (UTC)
Subject: Converting HTML to PDF using Python?
References: <1ca0597c-b5c7-496c-8636-2dd1359592be@y7g2000prc.googlegroups.com>
Message-ID: <hn3vtr$knk$1@reader1.panix.com>

On 2010-03-08, Oltmans <rolf.oltmans at gmail.com> wrote:

> Guys, any ideas on how to convert HTML files to PDF files?

os.system("w3m -dump %s | a2ps -B --borders=no -o - | ps2pdf - %s" % (infile,outfile))

-- 
Grant Edwards               grant.b.edwards        Yow! Am I accompanied by a
                                  at               PARENT or GUARDIAN?
                              gmail.com            


From python at mrabarnett.plus.com  Mon Mar  8 18:15:44 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Mon, 08 Mar 2010 23:15:44 +0000
Subject: related lists mean value
In-Reply-To: <e75321bd1003081434m27373b1esae82712d055c07c3@mail.gmail.com>
References: <e75321bd1003081434m27373b1esae82712d055c07c3@mail.gmail.com>
Message-ID: <4B958520.8000701@mrabarnett.plus.com>

dimitri pater - serpia wrote:
> Hi,
> 
> I have two related lists:
> x = [1 ,2, 8, 5, 0, 7]
> y = ['a', 'a', 'b', 'c', 'c', 'c' ]
> 
> what I need is a list representing the mean value of 'a', 'b' and 'c'
> while maintaining the number of items (len):
> w = [1.5, 1.5, 8, 4, 4, 4]
> 
> I have looked at iter(tools) and next(), but that did not help me. I'm
> a bit stuck here, so your help is appreciated!
> 
Try doing it in 2 passes.

First pass: count the number of times each string occurs in 'y' and the
total for each (zip/izip and defaultdict are useful for these).

Second pass: create the result list containing the mean values.


From clp2 at rebertia.com  Mon Mar  8 18:22:39 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 8 Mar 2010 15:22:39 -0800
Subject: related lists mean value
In-Reply-To: <e75321bd1003081434m27373b1esae82712d055c07c3@mail.gmail.com>
References: <e75321bd1003081434m27373b1esae82712d055c07c3@mail.gmail.com>
Message-ID: <50697b2c1003081522p565ed44fxd68761c0b19bcfc7@mail.gmail.com>

On Mon, Mar 8, 2010 at 2:34 PM, dimitri pater - serpia
<dimitri.pater at gmail.com> wrote:
> Hi,
>
> I have two related lists:
> x = [1 ,2, 8, 5, 0, 7]
> y = ['a', 'a', 'b', 'c', 'c', 'c' ]
>
> what I need is a list representing the mean value of 'a', 'b' and 'c'
> while maintaining the number of items (len):
> w = [1.5, 1.5, 8, 4, 4, 4]
>
> I have looked at iter(tools) and next(), but that did not help me. I'm
> a bit stuck here, so your help is appreciated!

from __future__ import division

def group(keys, values):
    #requires None not in keys
    groups = []
    cur_key = None
    cur_vals = None
    for key, val in zip(keys, values):
        if key != cur_key:
            if cur_key is not None:
                groups.append((cur_key, cur_vals))
            cur_vals = [val]
            cur_key = key
        else:
            cur_vals.append(val)
    groups.append((cur_key, cur_vals))
    return groups

def average(lst):
    return sum(lst) / len(lst)

def process(x, y):
    result = []
    for key, vals in group(y, x):
        avg = average(vals)
        for i in xrange(len(vals)):
            result.append(avg)
    return result

x = [1 ,2, 8, 5, 0, 7]
y = ['a', 'a', 'b', 'c', 'c', 'c' ]

print process(x, y)
#=> [1.5, 1.5, 8.0, 4.0, 4.0, 4.0]

It could be tweaked to use itertools.groupby(), but it would probably
be less efficient/clear.

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


From davea at ieee.org  Mon Mar  8 18:24:07 2010
From: davea at ieee.org (Dave Angel)
Date: Mon, 08 Mar 2010 18:24:07 -0500
Subject: Reverse engineering CRC?
In-Reply-To: <7vlameF7goU1@mid.individual.net>
References: <7vj7fdFnnjU1@mid.individual.net>	<4b9471ee$0$8836$c3e8da3@news.astraweb.com>	<7vk3eiFtivU1@mid.individual.net>	<mailman.459.1268053659.23598.python-list@python.org>
	<7vlameF7goU1@mid.individual.net>
Message-ID: <4B958717.7040708@ieee.org>

Gregory Ewing wrote:
> <div class="moz-text-flowed" style="font-family: -moz-fixed">Dave 
> Angel wrote:
>> If you know so little about the value, how do you even know it's a 
>> CRC ?  Could it be a ones-complement sum, such as used in Ethernet?
>
> I'm going by the fact that the application reports a
> "CRC mismatch" when it's wrong. I can't be sure that what
> it calls a "CRC" is really a true CRC, but it's more than
> a simple sum, because changing one bit in the file results
> in a completely different value.
>
>> Is the problem really worth it?
>
> Probably not -- it looks like fixing the problem I'm trying
> to fix by hand will be faster in the long run. I just thought
> it might turn out to be a solved problem and someone could
> point me to an algorithm for it, but it seems not.
>
If you assume it's done in a single pass, and you know which byte is the 
end of the buffer, I'd think you could learn a lot by just tweaking that 
last byte.  But I still think you'd want to automate your testing, 
presumably by some keystroke-stuffer.

DaveA



From mensanator at aol.com  Mon Mar  8 18:32:14 2010
From: mensanator at aol.com (Mensanator)
Date: Mon, 8 Mar 2010 15:32:14 -0800 (PST)
Subject: Python 3.1.2 release candidate
References: <mailman.413.1267913634.23598.python-list@python.org>
Message-ID: <90da6fb8-e555-4a74-bf13-14878f60f5d4@g11g2000yqe.googlegroups.com>

On Mar 6, 4:13?pm, Benjamin Peterson <benja... at python.org> wrote:
> On behalf of the Python development team, I'm pleased to announce a release
> candidate for the second bugfix release of the Python 3.1 series, Python 3.1.2.
>
> This bug fix release fixes numerous issues found in 3.1.1. ?This release
> candidate has been released to solicit testing and feedback over an possible
> regressions from 3.1.1. ?Please consider testing it with your library or
> application and reporting an bugs you encounter. ?This will help make the final
> 3.1.2 release, planned in 2 weeks time, all the more stable.
>
> The Python 3.1 version series focuses on the stabilization and optimization of
> the features and changes that Python 3.0 introduced. ?For example, the new I/O
> system has been rewritten in C for speed. ?File system APIs that use unicode
> strings now handle paths with undecodable bytes in them. Other features include
> an ordered dictionary implementation, a condensed syntax for nested with
> statements, and support for ttk Tile in Tkinter. ?For a more extensive list of
> changes in 3.1, seehttp://doc.python.org/3.1/whatsnew/3.1.htmlor Misc/NEWS in
> the Python distribution.
>
> To download Python 3.1.2rc1 visit:
>
> ? ? ?http://www.python.org/download/releases/3.1.2/
>
> A list of changes in 3.1.2rc1 can be found here:
>
> ? ? ?http://svn.python.org/projects/python/tags/r312rc1/Misc/NEWS
>
> The 3.1 documentation can be found at:
>
> ? ? ?http://docs.python.org/3.1
>
> Bugs can always be reported to:
>
> ? ? ?http://bugs.python.org

Hey, it finally let me register. Turned out the e-mail
to confirm registry was getting marked Spam. I pulled it
out of the Spam box and completed the registration.

Of course, the reason I needed to register is because
IDLE will *still* not end a process properly in Windows.

see issue 8093

>
> Enjoy!
>
> --
> Benjamin Peterson
> Release Manager
> benjamin at python.org
> (on behalf of the entire python-dev team and 3.1.2's contributors)



From dimitri.pater at gmail.com  Mon Mar  8 18:47:12 2010
From: dimitri.pater at gmail.com (dimitri pater - serpia)
Date: Tue, 9 Mar 2010 00:47:12 +0100
Subject: related lists mean value
In-Reply-To: <50697b2c1003081522p565ed44fxd68761c0b19bcfc7@mail.gmail.com>
References: <e75321bd1003081434m27373b1esae82712d055c07c3@mail.gmail.com>
	<50697b2c1003081522p565ed44fxd68761c0b19bcfc7@mail.gmail.com>
Message-ID: <e75321bd1003081547s33999032kb86cfc4726ddb2c5@mail.gmail.com>

thanks Chris and MRAB!
Looks good, I'll try it out

On Tue, Mar 9, 2010 at 12:22 AM, Chris Rebert <clp2 at rebertia.com> wrote:
> On Mon, Mar 8, 2010 at 2:34 PM, dimitri pater - serpia
> <dimitri.pater at gmail.com> wrote:
>> Hi,
>>
>> I have two related lists:
>> x = [1 ,2, 8, 5, 0, 7]
>> y = ['a', 'a', 'b', 'c', 'c', 'c' ]
>>
>> what I need is a list representing the mean value of 'a', 'b' and 'c'
>> while maintaining the number of items (len):
>> w = [1.5, 1.5, 8, 4, 4, 4]
>>
>> I have looked at iter(tools) and next(), but that did not help me. I'm
>> a bit stuck here, so your help is appreciated!
>
> from __future__ import division
>
> def group(keys, values):
> ? ?#requires None not in keys
> ? ?groups = []
> ? ?cur_key = None
> ? ?cur_vals = None
> ? ?for key, val in zip(keys, values):
> ? ? ? ?if key != cur_key:
> ? ? ? ? ? ?if cur_key is not None:
> ? ? ? ? ? ? ? ?groups.append((cur_key, cur_vals))
> ? ? ? ? ? ?cur_vals = [val]
> ? ? ? ? ? ?cur_key = key
> ? ? ? ?else:
> ? ? ? ? ? ?cur_vals.append(val)
> ? ?groups.append((cur_key, cur_vals))
> ? ?return groups
>
> def average(lst):
> ? ?return sum(lst) / len(lst)
>
> def process(x, y):
> ? ?result = []
> ? ?for key, vals in group(y, x):
> ? ? ? ?avg = average(vals)
> ? ? ? ?for i in xrange(len(vals)):
> ? ? ? ? ? ?result.append(avg)
> ? ?return result
>
> x = [1 ,2, 8, 5, 0, 7]
> y = ['a', 'a', 'b', 'c', 'c', 'c' ]
>
> print process(x, y)
> #=> [1.5, 1.5, 8.0, 4.0, 4.0, 4.0]
>
> It could be tweaked to use itertools.groupby(), but it would probably
> be less efficient/clear.
>
> Cheers,
> Chris
> --
> http://blog.rebertia.com
>



-- 
---
You can't have everything. Where would you put it? -- Steven Wright
---
please visit www.serpia.org


From aahz at pythoncraft.com  Mon Mar  8 20:47:58 2010
From: aahz at pythoncraft.com (Aahz)
Date: 8 Mar 2010 17:47:58 -0800
Subject: Queue peek?
References: <26348e98-9b81-45fe-85b4-7788eba176c9@j27g2000yqn.googlegroups.com>
	<b90150df-386a-4419-b535-cbb269ab288f@k2g2000pro.googlegroups.com>
	<58f61382-ac79-46fb-8612-a3c9fde297dc@c16g2000yqd.googlegroups.com>
Message-ID: <hn49ce$fgd$1@panix5.panix.com>

In article <58f61382-ac79-46fb-8612-a3c9fde297dc at c16g2000yqd.googlegroups.com>,
Veloz  <michaelveloz at gmail.com> wrote:
>
>The "peek" parts comes in when the user comes back later to see if
>their report has done. That is, in my page controller logic, I'd like
>to look through the complete queue and see if the specific report has
>been finished (I could tell by matching up the ID of the original
>request to the ID in the completed queue). If there was an item in the
>queue matching the ID, it would be removed.

Here's the question: what happens when the user refreshes the "report
done" page?  The problem with the way you're doing it is that checking
for report done is a one-shot operation.  You probably want to use a
database to cache this and have some kind of cache expiration.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From jjposner at optimum.net  Mon Mar  8 21:39:59 2010
From: jjposner at optimum.net (John Posner)
Date: Mon, 08 Mar 2010 21:39:59 -0500
Subject: related lists mean value
In-Reply-To: <mailman.470.1268087649.23598.python-list@python.org>
References: <mailman.470.1268087649.23598.python-list@python.org>
Message-ID: <4B95B4FF.1070407@optimum.net>

On 3/8/2010 5:34 PM, dimitri pater - serpia wrote:
> Hi,
>
> I have two related lists:
> x = [1 ,2, 8, 5, 0, 7]
> y = ['a', 'a', 'b', 'c', 'c', 'c' ]
>
> what I need is a list representing the mean value of 'a', 'b' and 'c'
> while maintaining the number of items (len):
> w = [1.5, 1.5, 8, 4, 4, 4]
>
> I have looked at iter(tools) and next(), but that did not help me. I'm
> a bit stuck here, so your help is appreciated!

Nobody expects object-orientation (or the Spanish Inquisition):

#-------------------------
from collections import defaultdict

class Tally:
     def __init__(self, id=None):
         self.id = id
         self.total = 0
         self.count = 0

x = [1 ,2, 8, 5, 0, 7]
y = ['a', 'a', 'b', 'c', 'c', 'c']

# gather data
tally_dict = defaultdict(Tally)
for i in range(len(x)):
     obj = tally_dict[y[i]]
     obj.id = y[i]
     obj.total += x[i]
     obj.count += 1

# process data
result_list = []
for key in sorted(tally_dict):
     obj = tally_dict[key]
     mean = 1.0 * obj.total / obj.count
     result_list.extend([mean] * obj.count)
print result_list
#-------------------------

-John


From jjposner at optimum.net  Mon Mar  8 21:43:58 2010
From: jjposner at optimum.net (John Posner)
Date: Mon, 08 Mar 2010 21:43:58 -0500
Subject: related lists mean value
In-Reply-To: <4B95B4FF.1070407@optimum.net>
References: <mailman.470.1268087649.23598.python-list@python.org>
	<4B95B4FF.1070407@optimum.net>
Message-ID: <4B95B5EE.90302@optimum.net>

On 3/8/2010 9:39 PM, John Posner wrote:

<snip>

> # gather data
> tally_dict = defaultdict(Tally)
> for i in range(len(x)):
> obj = tally_dict[y[i]]
> obj.id = y[i]                 <--- statement redundant, remove it
> obj.total += x[i]
> obj.count += 1

-John




From jjposner at optimum.net  Mon Mar  8 21:53:41 2010
From: jjposner at optimum.net (John Posner)
Date: Mon, 08 Mar 2010 21:53:41 -0500
Subject: related lists mean value
In-Reply-To: <4B95B5EE.90302@optimum.net>
References: <mailman.470.1268087649.23598.python-list@python.org>
	<4B95B4FF.1070407@optimum.net> <4B95B5EE.90302@optimum.net>
Message-ID: <4B95B835.4050805@optimum.net>

On 3/8/2010 9:43 PM, John Posner wrote:
> On 3/8/2010 9:39 PM, John Posner wrote:
>
> <snip>

>> obj.id = y[i] <--- statement redundant, remove it

Sorry for the thrashing! It's more correct to say that the Tally class 
doesn't require an "id" attribute at all. So the code becomes:

#---------
from collections import defaultdict

class Tally:
     def __init__(self):
         self.total = 0
         self.count = 0

x = [1 ,2, 8, 5, 0, 7]
y = ['a', 'a', 'b', 'c', 'c', 'c']

# gather data
tally_dict = defaultdict(Tally)
for i in range(len(x)):
     obj = tally_dict[y[i]]
     obj.total += x[i]
     obj.count += 1

# process data
result_list = []
for key in sorted(tally_dict):
     obj = tally_dict[key]
     mean = 1.0 * obj.total / obj.count
     result_list.extend([mean] * obj.count)
print result_list
#---------

-John


From df.trash at gmail.com  Mon Mar  8 22:35:50 2010
From: df.trash at gmail.com (tdan)
Date: Mon, 8 Mar 2010 19:35:50 -0800 (PST)
Subject: remove element with ElementTree
Message-ID: <790217d6-e230-44e8-9aa1-4f8c7a66170c@g7g2000yqe.googlegroups.com>

I have been using ElementTree to write an app, and would like to
simply remove an element.
But in ElementTree, you must know both the parent and the child
element to do this.
There is no getparent() function, so I am stuck if I only have an
element.

I am iterating over a table and getting all <td> tags, checking their
text, and conditionally deleting them:

def RemoveElementWithText( topEl, subEl, text ):
	for el in topEl.getiterator( subEl ):
		if el.text = text:
			break
	else:
		el = None
	return el

RemoveElementWithText( table, 'td', 'sometext' )

My table is like so:

<table>
 <thead>...
 <tbody><tr><td>...

Is there any way to do this in ElementTree?  I see lxml.etree does
this nicely, but I want to use python's standard library.


From fox.joe87 at gmail.com  Mon Mar  8 23:13:58 2010
From: fox.joe87 at gmail.com (Joe Fox)
Date: Tue, 9 Mar 2010 09:43:58 +0530
Subject: libc Sleep api performs a busy waiting
In-Reply-To: <hn2qta$886$2@dough.gmane.org>
References: <a52b97c0-7266-4bc6-9ab4-3a8688120a6c@u19g2000prh.googlegroups.com>
	<hn2qta$886$2@dough.gmane.org>
Message-ID: <27e52ad11003082013h658cf7deu761e7d14198af9f1@mail.gmail.com>

Hi,

 actually i have simplified my scenario a lot here ,

In my actual case , i have to call a C-api which blocks on  c select , in a
separate thread.

my thread is getting struck in that api , and thus blocking all the other
threads.
Can you point to something which will help me call this blocking C-api call
without my thread getting struck.


Thanks
Mahesh

On Mon, Mar 8, 2010 at 6:03 PM, Steve Holden <steve at holdenweb.com> wrote:

> Mahesh wrote:
> > Hi,
> >
> >  I am having a problem while using sleep function from libc , the
> > thread in which i am calling it is getting struck and not allowing
> > other threads to execute.  Here is a simple code that i am trying to
> > exeute
> >
> > import threading
> > import time
> > import dl
> >
> >
> > def dummy1():
> >     a=dl.open('/lib/libc.so.6')
> >     print "in thread 1 Start"
> >     a.call('sleep',2)
> >     #time.sleep(2)
> >     print "in thread 1 End"
> >
> > def dummy2():
> >     print "in thread 2 Start"
> >     time.sleep(1)
> >     print "in thread 2 End"
> > newThread1=threading.Thread(None,dummy1)
> > newThread2=threading.Thread(None,dummy2)
> > newThread1.start()
> > newThread2.start()
> >
> > print "in main"
> >
> >
> >
> > The out put of this program is  (In this case thread 1 even though i
> > am calling a sleep function its not allowing other threads to execute,
> > other threads execute only after the completion of first thread)
> >
> > in thread 1 Start
> > in thread 1 End
> > in thread 2 Start
> > in main
> > in thread 2 End
> >
> >
> > where as if i use time.sleep instead of a.call(sleep) the out put is
> > (which i guess is right behaviour, because it start the threads and
> > suspends them because the have sleep , and continue executing the main
> > thread)
> > in thread 1 Start
> > in thread 2 Start
> > in main
> > in thread 2 End
> > in thread 1 End
> >
> >
> Why not just use the time module's sleep function? Unlike the libc code
> it releases Python's GIL (global interpreter lock), thus allowing other
> threads to run.
>
> regards
>  Steve
> --
> Steve Holden           +1 571 484 6266   +1 800 494 3119
> PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
> Holden Web LLC                 http://www.holdenweb.com/
> UPCOMING EVENTS:        http://holdenweb.eventbrite.com/
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From mehgcap at gmail.com  Mon Mar  8 23:22:27 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Mon, 8 Mar 2010 23:22:27 -0500
Subject: imported var not being updated
Message-ID: <bc7f680c1003082022k4b1dd708i1d6e17cdf05db563@mail.gmail.com>

Hello all:
I have a project with many pyw files. One file holds a variable and a
function that I find myself using across many other pyw files, so I
called it helpers.pyw. The variable is "mostRecent", which is a string
and is meant to hold a string so I know what the program most recently
output; in all the other pyw files, every time the program outputs
something, I include the line
helpers.mostRecent=output
where output is a string and helpers has been imported.

The problem is that mostRecent does not seem to be updated at all, and
I cannot figure out why. I declare it with empty quotes initially, but
the program should keep updating it. Everytime I go to see what its
value is, though, it is still apparently empty. Here is a basic
sample:

randomFile.pyw
---
import helpers

def something():
  output="I am the most recently output string!"
  helpers.mostRecent=output
#end def

file2.pyw
---
from helpers import mostRecent

print(mostRecent) #prints nothing

Any thoughts on what I am doing wrong? Thanks!!

-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From gherron at islandtraining.com  Mon Mar  8 23:55:01 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Mon, 08 Mar 2010 20:55:01 -0800
Subject: imported var not being updated
In-Reply-To: <bc7f680c1003082022k4b1dd708i1d6e17cdf05db563@mail.gmail.com>
References: <bc7f680c1003082022k4b1dd708i1d6e17cdf05db563@mail.gmail.com>
Message-ID: <4B95D4A5.6050504@islandtraining.com>

Alex Hall wrote:
> Hello all:
> I have a project with many pyw files. One file holds a variable and a
> function that I find myself using across many other pyw files, so I
> called it helpers.pyw. The variable is "mostRecent", which is a string
> and is meant to hold a string so I know what the program most recently
> output; in all the other pyw files, every time the program outputs
> something, I include the line
> helpers.mostRecent=output
> where output is a string and helpers has been imported.
>
> The problem is that mostRecent does not seem to be updated at all, and
> I cannot figure out why. I declare it with empty quotes initially, but
> the program should keep updating it. Everytime I go to see what its
> value is, though, it is still apparently empty. Here is a basic
> sample:
>
> randomFile.pyw
> ---
> import helpers
>
> def something():
>   output="I am the most recently output string!"
>   helpers.mostRecent=output
> #end def
>
> file2.pyw
> ---
> from helpers import mostRecent
>
> print(mostRecent) #prints nothing
>
> Any thoughts on what I am doing wrong? Thanks!!
>   

The form of import you are using
    from helpers import mostRecent
makes a *new* binding to the value in the module that's doing the 
import.  Rebinding the var in a different module does not affect this.  
It's similar to this:

    a = 'string'
    b = a
    a = 'another string'

won't affect b's value.

What you can do, is not make a separate binding, but reach into the 
helpers module to get the value there.  Like this:

    import helpers
    print helpers.mostRecent

That will work as you hope.

Gary Herron




From mehgcap at gmail.com  Mon Mar  8 23:59:00 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Mon, 8 Mar 2010 23:59:00 -0500
Subject: imported var not being updated
In-Reply-To: <4B95D4A5.6050504@islandtraining.com>
References: <bc7f680c1003082022k4b1dd708i1d6e17cdf05db563@mail.gmail.com>
	<4B95D4A5.6050504@islandtraining.com>
Message-ID: <bc7f680c1003082059y33171178gb88ce72b8fb3ad9b@mail.gmail.com>

Thanks, it worked as expected. I guess I figured that Python would
read my mind and realize that I wanted mostRecent to act globally for
the program, imported as a copy or accessed in its own namespace
(right term?) Oh well, the day computers can read thoughts like that
is the day programmers are out of a job... Thanks again.

On 3/8/10, Gary Herron <gherron at islandtraining.com> wrote:
> Alex Hall wrote:
>> Hello all:
>> I have a project with many pyw files. One file holds a variable and a
>> function that I find myself using across many other pyw files, so I
>> called it helpers.pyw. The variable is "mostRecent", which is a string
>> and is meant to hold a string so I know what the program most recently
>> output; in all the other pyw files, every time the program outputs
>> something, I include the line
>> helpers.mostRecent=output
>> where output is a string and helpers has been imported.
>>
>> The problem is that mostRecent does not seem to be updated at all, and
>> I cannot figure out why. I declare it with empty quotes initially, but
>> the program should keep updating it. Everytime I go to see what its
>> value is, though, it is still apparently empty. Here is a basic
>> sample:
>>
>> randomFile.pyw
>> ---
>> import helpers
>>
>> def something():
>>   output="I am the most recently output string!"
>>   helpers.mostRecent=output
>> #end def
>>
>> file2.pyw
>> ---
>> from helpers import mostRecent
>>
>> print(mostRecent) #prints nothing
>>
>> Any thoughts on what I am doing wrong? Thanks!!
>>
>
> The form of import you are using
>     from helpers import mostRecent
> makes a *new* binding to the value in the module that's doing the
> import.  Rebinding the var in a different module does not affect this.
> It's similar to this:
>
>     a = 'string'
>     b = a
>     a = 'another string'
>
> won't affect b's value.
>
> What you can do, is not make a separate binding, but reach into the
> helpers module to get the value there.  Like this:
>
>     import helpers
>     print helpers.mostRecent
>
> That will work as you hope.
>
> Gary Herron
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From gagsl-py2 at yahoo.com.ar  Tue Mar  9 01:03:36 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 09 Mar 2010 03:03:36 -0300
Subject: How to determine if threads are active in an application?
References: <1267222230.24180.1362126901@webmail.messagingengine.com>
Message-ID: <op.u9adsaqdx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 26 Feb 2010 19:10:30 -0300, <python at bdurham.com> escribi?:

> Is there technique to determine if threads are active in a Python
> application?
>
> The only technique I can think of is to check sys.modules for
> thread and threading. But this will only show whether these
> modules were imported - not whether there are actually background
> threads running.

I've just read your post.
Look at threading.activeCount() - this returns only those threads created  
using the threading module. If that's not enough, you'll have to use some  
OS-specific functions.

-- 
Gabriel Genellina



From see at sig.for.address  Tue Mar  9 01:14:37 2010
From: see at sig.for.address (Victor Eijkhout)
Date: Tue, 9 Mar 2010 00:14:37 -0600
Subject: scipy sparse matrix question
Message-ID: <1jf28jr.7abra61nwu04pN%see@sig.for.address>

I can't find any detailed information about scipy.sparse.

My specific question: what does "for x in A" give me when A is a sparse
matrix? It seems to yield all nonzero locations, but in what kind of
form? Very specifically: how do I get the (i,j) coordinates and the
value from x?

Victor.

-- 
Victor Eijkhout -- eijkhout at tacc utexas edu


From casevh at gmail.com  Tue Mar  9 01:39:30 2010
From: casevh at gmail.com (casevh)
Date: Mon, 8 Mar 2010 22:39:30 -0800 (PST)
Subject: Calculating very large exponents in python
References: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>
	<f3cc57c61003071240x18b580bend946824ef7955b6c@mail.gmail.com> 
	<COL110-W1236CED756D3C9374CB0A2B7350@phx.gbl>
	<mailman.466.1268075137.23598.python-list@python.org>
Message-ID: <90e5f42d-b0d0-4578-82ea-9d0e5770048b@k2g2000pro.googlegroups.com>

[also replying to Geremy since the OP's message doesn't appear...]

On Mar 8, 11:05?am, geremy condra <debat... at gmail.com> wrote:
> On Mon, Mar 8, 2010 at 2:15 AM, Fahad Ahmad <miracles... at hotmail.com> wrote:
> > Thanks Geremy,
>
> > That has been an absolute bump........... GOD i cant sit on my chair, it has
> > worked even on 512 bit number and with no time..........
> > superb i would say.
>
> > lastly, i am using the code below to calculate Largest Prime factor of a
> > number:
>
> > print
> > ('''=======================================================================?========'''
> > ?????? '''????????????? CALCULATE? HIGHEST PRIME
> > FACTOR????????????????????????????????? '''
>
> > '''========================================================================?=======''')
>
> > #!/usr/bin/env python
> > def highest_prime_factor(n):
> > ?? if isprime(n):
> > ????? return n
> > ?? for x in xrange(2,n ** 0.5 + 1):
> > ????? if not n % x:
> > ???????? return highest_prime_factor(n/x)
> > def isprime(n):
> > ?? for x in xrange(2,n ** 0.5 + 1):
> > ????? if not n % x:
> > ???????? return False
> > ?? return True
> > if? __name__ == "__main__":
> > ?? import time
> > ?? start = time.time()
> > ?? print highest_prime_factor(1238162376372637826)
> > ?? print time.time() - start
>
> > the code works with a bit of delay on the number : "1238162376372637826" but
> > extending it to
> > (10902610991329142436630551158108608965062811746392577675456004845499113044?304710902610991329142436630551158108608965062811746392577675456004845499113?0443047)
> > ?makes python go crazy. Is there any way just like above, i can have it
> > calculated it in no time.
>
> > thanks for the support.
>
> If you're just looking for the largest prime factor I would suggest using
> a fermat factorization attack. In the example you gave, it returns
> nearly immediately.
>
> Geremy Condra- Hide quoted text -
>
> - Show quoted text -

For a Python-based solution, you might want to look at pyecm (http://
sourceforge.net/projects/pyecm/)

On a system with gmpy installed also, pyecm found the following
factors:

101, 521, 3121, 9901, 36479, 300623, 53397071018461,
1900381976777332243781

There still is a 98 digit unfactored composite:

60252507174568243758911151187828438446814447653986842279796823262165159406500174226172705680274911

Factoring this remaining composite using ECM may not be practical.

casevh


From faheem_imt at yahoo.com  Tue Mar  9 02:51:57 2010
From: faheem_imt at yahoo.com (Faheem)
Date: Mon, 8 Mar 2010 23:51:57 -0800 (PST)
Subject: How to detect C Function block using python
Message-ID: <769249.71022.qm@web62401.mail.re1.yahoo.com>


Hey All,
I'm new in this community. I am?writing?a static?analyzer?for validating C Code using python and for that?I'm looking for a python module/API that will detect Function block of a given C-File.?I know simple function can be detected using push "{" and poping it if character "}" is found. This solution is actually done already, I want a robust API that can do more then that like detecting Function name parameters its return types etc.
Thanks!Faheem  




      
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From vinay_sajip at yahoo.co.uk  Tue Mar  9 03:17:51 2010
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Tue, 9 Mar 2010 00:17:51 -0800 (PST)
Subject: Conditional based on whether or not a module is being used
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
	<50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com> 
	<14a5cd5e1003051225j1d596aa2nfe9eb1047037f19d@mail.gmail.com> 
	<mailman.383.1267823696.23598.python-list@python.org>
	<f4de1c96-502a-42e7-b647-ce52d0f76f2f@u15g2000prd.googlegroups.com>
	<29c6a957-5028-4c2d-8594-6c4db8243ef2@d2g2000yqa.googlegroups.com> 
	<mailman.422.1267965329.23598.python-list@python.org>
Message-ID: <42062deb-785a-4955-9ce0-d9fb7a26455d@j27g2000yqn.googlegroups.com>

On Mar 7, 12:34?pm, Steve Holden <st... at holdenweb.com> wrote:
> My own impression of theloggingmodule, formed from trying to use its
> documentation in the past, is that it's somewhat unapproachable, and
> difficult to use for simple purposes.
>
> I am happy to say that now I see the current (3.1) documentation it has
> improved to the point where I would be happy to try using it again.
> Thanks for your long-term maintenance of this package.
>

Hi Steve,

Thanks for the positive feedback. The initial documentation for the
logging package, because it lives in the library section of the
overall documentation, was focused more on completeness of coverage
for reference usage, rather than a more tutorial-based approach.
Thanks to work by Doug Hellmann and others, the documentation has
grown, over time, more accessible to Python novices. It's still not
perfect, and I hope to be able to improve its clarity in the future,
by getting help where possible from people who are better at technical
writing than I am.

I'm reviewing the documentation at the moment, as it happens, and it
still seems hard to be able to put together a structure which is good
for everyone. A full treatment, it seems to me, would talk a little
about the detail of why things work as they do; but a lot of the time,
people are just interested in getting going with the package, and less
interested in the whys and wherefores. But for people trying to do
more than the basics, that deeper understanding is sometimes
necessary. The hard part is satisfying all audiences in one document!

Regards,

Vinay Sajip


From stephane at harobed.org  Tue Mar  9 03:30:05 2010
From: stephane at harobed.org (KLEIN =?iso-8859-1?q?St=E9phane?=)
Date: Tue, 9 Mar 2010 08:30:05 +0000 (UTC)
Subject: Are there in Python some static web site generating tools like
	webgen, nanoc or webby in Ruby ?
Message-ID: <hn50ud$27u$1@dough.gmane.org>

Hi,

Today, I've show this static web site generating tools writed in ruby :

 * http://webgen.rubyforge.org/index.html
 * http://nanoc.stoneship.org/about/
 * http://webby.rubyforge.org/tutorial/

I like this tools, I'm wonder if there are similar tools in Python ?

I know Sphinx, but this tools is oriented documentation.

Thanks for your information,
Stephane



From kishoreinme at gmail.com  Tue Mar  9 03:39:15 2010
From: kishoreinme at gmail.com (kishore)
Date: Tue, 9 Mar 2010 00:39:15 -0800 (PST)
Subject: pyserial script doesnt execute properly
Message-ID: <c083a958-7320-4fd3-82ae-cf4da7808af6@u15g2000prd.googlegroups.com>

hello there

Iam using python 2.5.4
pyserial  2.4
pywin32-214

on windows 7


i hav a small test script written to query a serial device (arduino)
and get back reply appropriately



////file: test.py

import serial
print 'hi'
ser=serial.Serial(port='\\.\COM2', baudrate=9600)
ser.close()
ser.open()
ser.write('1')
ser.readline()
ser.readline()
ser.close()



the device waits for '1' through its serial interface and print two
lines if it gets '1'

"Some Data found" and "Header received"


the script works on IDLE well when given one line at a time

but when given in command line as python test.py it prints hi and wait
forever

can anyone help?
thanks in advance



From vinay_sajip at yahoo.co.uk  Tue Mar  9 03:54:03 2010
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Tue, 9 Mar 2010 00:54:03 -0800 (PST)
Subject: Conditional based on whether or not a module is being used
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
	<50697b2c1003051217p4f55af01lbc0ce435a0cb9207@mail.gmail.com> 
	<14a5cd5e1003051225j1d596aa2nfe9eb1047037f19d@mail.gmail.com> 
	<mailman.383.1267823696.23598.python-list@python.org>
	<f4de1c96-502a-42e7-b647-ce52d0f76f2f@u15g2000prd.googlegroups.com>
	<29c6a957-5028-4c2d-8594-6c4db8243ef2@d2g2000yqa.googlegroups.com> 
	<9c6a8d26-b71e-4cb8-92d0-49af8728bec4@u15g2000prd.googlegroups.com>
Message-ID: <80645b57-b586-400e-8a8d-0ec97f3c8455@b30g2000yqd.googlegroups.com>

On Mar 6, 11:13 pm, Pete Emerson <pemer... at gmail.com> wrote:
>
> 1) In debug mode, send what would have gone to syslog to STDOUT or
> STDERR
> 2) In non-debug mode, use /dev/log or localhost:514 depending on what
> is set
> 3) Allow for multiple levels ofloggingbeyond INFO, WARNING, CRIT ...
> essentially allow multiple levels of INFO depending on how much detail
> is desired.  A high level of messaging when programs are running
> poorly is desired, but when programs are running smoothly, I don't
> need to send as much to syslog.


By "debug mode", do you mean the value of the __debug__ variable, or
something else (e.g. a flag in your application)?

You could certainly do something like (in your logging initialization
code):

if __debug__:
   handler = logging.StreamHandler()
else:
   #use domain socket, UDP, etc.
   handler = logging.handlers.SocketHandler(...)
logger.addHandler(handler)

where logger is the root logger or some other high-level logger in
your application.

By the way, are you aware that accessing syslog via openlog etc. may
not thread-safe, at least in some environments? Search the Web for
"syslog openlog thread" for more info.

You can certainly add additional levels to logging (see addLevelName),
but I'm not sure that's what you really need. Generally, I find that
when there are problems to be debugged, I get more benefits from using
the logger hierarchy: I keep the level at logging.DEBUG but just log
different things to different loggers. Just as a fr'instance, if I
were logging the parsing of HTTP requests, I might use loggers named
'request', 'request.headers', 'request.headers.cookies',
'request.body', 'request.body.multipart' etc. When everything is
working well, I have the verbosity of these loggers turned low by e.g.
setting the level for the 'request' logger to WARNING or higher; when
I want to debug header processing in more detail I might set the level
of the 'request.headers' logger to DEBUG, which would output events
from request header processing (but not the body), or just turn up the
'request.headers.cookies' level to look in more detail at what's
happening during processing "Cookie:" headers.

Regards,

Vinay Sajip


From stephane at harobed.org  Tue Mar  9 03:57:32 2010
From: stephane at harobed.org (KLEIN =?ISO-8859-1?Q?St=E9phane?=)
Date: Tue, 09 Mar 2010 09:57:32 +0100
Subject: Are there in Python some static web site generating tools like
	webgen, nanoc or webby in Ruby ?
Message-ID: <1268125052.7405.1.camel@stephane-macbook>

Hi,

Today, I've show this static web site generating tools write in ruby :

 * http://webgen.rubyforge.org/index.html
 * http://nanoc.stoneship.org/about/
 * http://webby.rubyforge.org/tutorial/

I like this tools, I'm wonder if there are similar tools in Python ?

I know Sphinx, but this tools is oriented documentation.

Thanks for your information,
Stephane

-- 
St?phane Klein <stephane at harobed.org>
Blog : http://harobed.org 
Jabber : stephane.klein at jabber.fr



From news123 at free.fr  Tue Mar  9 04:19:56 2010
From: news123 at free.fr (News123)
Date: Tue, 09 Mar 2010 10:19:56 +0100
Subject: pyserial script doesnt execute properly
In-Reply-To: <c083a958-7320-4fd3-82ae-cf4da7808af6@u15g2000prd.googlegroups.com>
References: <c083a958-7320-4fd3-82ae-cf4da7808af6@u15g2000prd.googlegroups.com>
Message-ID: <4b9612bc$0$6059$426a74cc@news.free.fr>

Hi,

kishore wrote:
> hello there
> 
> Iam using python 2.5.4
> pyserial  2.4
> pywin32-214
> 
> on windows 7
> 
> 
> i hav a small test script written to query a serial device (arduino)
> and get back reply appropriately
> 
> 
> 
> ////file: test.py
> 
> import serial
> print 'hi'
> ser=serial.Serial(port='\\.\COM2', baudrate=9600)
> ser.close()
> ser.open()
> ser.write('1')
> ser.readline()
> ser.readline()
> ser.close()
> 
> 
> 
> the device waits for '1' through its serial interface and print two
> lines if it gets '1'
> 
> "Some Data found" and "Header received"
> 
> 
> the script works on IDLE well when given one line at a time
> 
> but when given in command line as python test.py it prints hi and wait
> forever
> 


Unfortunately I don't remember exacty, but try following:

close IDLE and try then to start the script from the command line.
I remember having had a problem with idle, that it did not always close
the UART port
(especially, when an error (e.g. syntax) occured before the close statement)


bye

N



From justin.mailinglists at gmail.com  Tue Mar  9 04:34:52 2010
From: justin.mailinglists at gmail.com (Justin Ezequiel)
Date: Tue, 9 Mar 2010 01:34:52 -0800 (PST)
Subject: remove element with ElementTree
References: <790217d6-e230-44e8-9aa1-4f8c7a66170c@g7g2000yqe.googlegroups.com>
Message-ID: <8ad6319f-97f1-46b7-b89e-d455bd89ad03@b9g2000pri.googlegroups.com>

On Mar 9, 11:35?am, tdan <df.tr... at gmail.com> wrote:
> I have been using ElementTree to write an app, and would like to
> simply remove an element.
> But in ElementTree, you must know both the parent and the child
> element to do this.
> There is no getparent() function, so I am stuck if I only have an
> element.
>

see http://effbot.org/zone/element.htm#accessing-parents


From dorzey at googlemail.com  Tue Mar  9 05:21:49 2010
From: dorzey at googlemail.com (dorzey)
Date: Tue, 9 Mar 2010 02:21:49 -0800 (PST)
Subject: Are there in Python some static web site generating tools like 
	webgen, nanoc or webby in Ruby ?
References: <mailman.481.1268125066.23598.python-list@python.org>
Message-ID: <058ebe77-de1b-4814-917a-57e6e65e2d03@t23g2000yqt.googlegroups.com>

On Mar 9, 8:57?am, KLEIN St?phane <steph... at harobed.org> wrote:
> Hi,
>
> Today, I've show this static web site generating tools write in ruby :
>
> ?*http://webgen.rubyforge.org/index.html
> ?*http://nanoc.stoneship.org/about/
> ?*http://webby.rubyforge.org/tutorial/
>
> I like this tools, I'm wonder if there are similar tools in Python ?
>
> I know Sphinx, but this tools is oriented documentation.
>
> Thanks for your information,
> Stephane

I'm only aware of Hyde (http://ringce.com/hyde)

Paul


From spamfresser at ch3ka.de  Tue Mar  9 05:30:26 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Tue, 09 Mar 2010 11:30:26 +0100
Subject: related lists mean value
In-Reply-To: <mailman.470.1268087649.23598.python-list@python.org>
References: <mailman.470.1268087649.23598.python-list@python.org>
Message-ID: <hn5801$sps$1@news.urz.uni-heidelberg.de>

Am 08.03.2010 23:34, schrieb dimitri pater - serpia:
> Hi,
>
> I have two related lists:
> x = [1 ,2, 8, 5, 0, 7]
> y = ['a', 'a', 'b', 'c', 'c', 'c' ]
>
> what I need is a list representing the mean value of 'a', 'b' and 'c'
> while maintaining the number of items (len):
> w = [1.5, 1.5, 8, 4, 4, 4]

This kinda looks like you used the wrong data structure.
Maybe you should have used a dict, like:
{'a': [1, 2], 'c': [5, 0, 7], 'b': [8]} ?

> I have looked at iter(tools) and next(), but that did not help me. I'm
> a bit stuck here, so your help is appreciated!

As said, I'd have used a dict in the first place, so lets transform this 
straight forward into one:

x = [1 ,2, 8, 5, 0, 7]
y = ['a', 'a', 'b', 'c', 'c', 'c' ]

# initialize dict
d={}
for idx in set(y):
     d[idx]=[]

#collect values
for i, idx in enumerate(y):
     d[idx].append(x[i])

print("d is now a dict of lists: %s" % d)

#calculate average
for key, values in d.items():
     d[key]=sum(values)/len(values)

print("d is now a dict of averages: %s" % d)

# build the final list
w = [ d[key] for key in y ]

print("w is now the list of averages, corresponding with y:\n \
         \n x: %s \n y: %s \n w: %s \n" % (x, y, w))


Output is:
d is now a dict of lists: {'a': [1, 2], 'c': [5, 0, 7], 'b': [8]}
d is now a dict of averages: {'a': 1.5, 'c': 4.0, 'b': 8.0}
w is now the list of averages, corresponding with y:

  x: [1, 2, 8, 5, 0, 7]
  y: ['a', 'a', 'b', 'c', 'c', 'c']
  w: [1.5, 1.5, 8.0, 4.0, 4.0, 4.0]

Could have used a defaultdict to avoid dict initialisation, though.
Or write a custom class:

x = [1 ,2, 8, 5, 0, 7]
y = ['a', 'a', 'b', 'c', 'c', 'c' ]

class A:
     def __init__(self):
         self.store={}
     def add(self, key, number):
         if key in self.store:
             self.store[key].append(number)
         else:
             self.store[key] = [number]
a=A()

# collect data
for idx, val in zip(y,x):
     a.add(idx, val)

# build the final list:
w = [ sum(a.store[key])/len(a.store[key]) for key in y ]

print("w is now the list of averages, corresponding with y:\n \
         \n x: %s \n y: %s \n w: %s \n" % (x, y, w))

Produces same output, of course.

Note that those solutions are both not very efficient, but who cares ;)

> thanks!

No Problem,

Michael


From javier.collado at gmail.com  Tue Mar  9 05:43:05 2010
From: javier.collado at gmail.com (Javier Collado)
Date: Tue, 9 Mar 2010 11:43:05 +0100
Subject: Are there in Python some static web site generating tools like 
	webgen, nanoc or webby in Ruby ?
In-Reply-To: <058ebe77-de1b-4814-917a-57e6e65e2d03@t23g2000yqt.googlegroups.com>
References: <mailman.481.1268125066.23598.python-list@python.org> 
	<058ebe77-de1b-4814-917a-57e6e65e2d03@t23g2000yqt.googlegroups.com>
Message-ID: <c83cde5a1003090243x4ee56e8vb8d5794649cb3ece@mail.gmail.com>

> I'm only aware of Hyde (http://ringce.com/hyde)

There are also jekyll and cyrax:
http://github.com/mojombo/jekyll/
http://pypi.python.org/pypi/cyrax/0.1.5

I haven't tried any of them, but it looks like cyrax is in active
development and its design was inspired in both jekyll and hyde.

Best regards,
    Javier


From spamfresser at ch3ka.de  Tue Mar  9 06:11:35 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Tue, 09 Mar 2010 12:11:35 +0100
Subject: related lists mean value (golfed)
In-Reply-To: <hn5801$sps$1@news.urz.uni-heidelberg.de>
References: <mailman.470.1268087649.23598.python-list@python.org>
	<hn5801$sps$1@news.urz.uni-heidelberg.de>
Message-ID: <hn5ad7$t8a$1@news.urz.uni-heidelberg.de>

OK, I golfed it :D
Go ahead and kill me ;)

x = [1 ,2, 8, 5, 0, 7]
y = ['a', 'a', 'b', 'c', 'c', 'c' ]

def f(a,b,v={}):
     try: v[a].append(b)
     except: v[a]=[b]
     def g(a): return sum(v[a])/len(v[a])
     return g
w = [g(i) for g,i in [(f(i,v),i) for i,v in zip(y,x)]]

print("w is now the list of averages, corresponding with y:\n \
         \n x: %s \n y: %s \n w: %s \n" % (x, y, w))

Output:
w is now the list of averages, corresponding with y:

  x: [1, 2, 8, 5, 0, 7]
  y: ['a', 'a', 'b', 'c', 'c', 'c']
  w: [1.5, 1.5, 8.0, 4.0, 4.0, 4.0]

Regards,
Michael


From steve at holdenweb.com  Tue Mar  9 06:18:06 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 09 Mar 2010 06:18:06 -0500
Subject: What to do if anything bites.
In-Reply-To: <4b957998$0$17135$426a34cc@news.free.fr>
References: <dbf9320f-a9b9-492c-9a5e-c687422c1464@y7g2000prc.googlegroups.com>
	<4b957998$0$17135$426a34cc@news.free.fr>
Message-ID: <hn5aps$vsv$1@dough.gmane.org>

News123 wrote:
> Google Adsense wrote:
>> What to do if anything bites.
>>
>> Check our bites treatment at
>>
>> http://...
> 
> Pythons don't bite

First, if you have to respond to spam please omit the URL that the
spammer is trying to bring to Google's attention as well as direct readers.

Secondly, do you realise you are posting from an address that has been
"suspended due to inactivity"? Otherwise you would have received this
message privately.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
PyCon is coming! Atlanta, Feb 2010  http://us.pycon.org/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From bob at leaddevice.com  Tue Mar  9 06:23:59 2010
From: bob at leaddevice.com (BobAalsma)
Date: Tue, 9 Mar 2010 03:23:59 -0800 (PST)
Subject: Newbie question: python versions differ per user?
References: <8a04bbfd-9c48-4397-8c81-c159dc1b8977@33g2000yqj.googlegroups.com>
Message-ID: <d813abae-f312-4932-9654-f6df83c773c0@t20g2000yqe.googlegroups.com>

On Mar 8, 8:15?pm, BobAalsma <bob.aal... at aalsmacons.nl> wrote:
> I'm on Mac OS X 10.5.8 and downloaded 2.6.4 Mac Installer Disk Image
> as/in(?) the sys admin user. For this user Pyhton 2.6.4 is now the
> current version.
> I want to use Python outside the sys asdmin user. However, all other
> users still use Python 2.5.1 (Apple delivered).
>
> The sys admin user looks in /Library/Frameworks/Python.framework/
> Versions/2.6/lib/...
> The other users look in ? ? ? ?/System/Library/Frameworks/
> Python.framework/Version/2.5/lib/...
>
> I could not find any questions on this matter, so am I the only one?
> Did I do something wrong?
> I assumed the paths for all users would be modified - too easy?

OK, sorry, found out.


From garabik-news-2005-05 at kassiopeia.juls.savba.sk  Tue Mar  9 06:28:23 2010
From: garabik-news-2005-05 at kassiopeia.juls.savba.sk (garabik-news-2005-05 at kassiopeia.juls.savba.sk)
Date: Tue, 9 Mar 2010 11:28:23 +0000 (UTC)
Subject: Are there in Python some static web site generating tools
	like?webgen, nanoc or webby in Ruby ?
References: <mailman.481.1268125066.23598.python-list@python.org>
Message-ID: <hn5bcn$odr$1@speranza.aioe.org>

KLEIN St?phane <stephane at harobed.org> wrote:
> Hi,
> 
> Today, I've show this static web site generating tools write in ruby :
> 
> * http://webgen.rubyforge.org/index.html
> * http://nanoc.stoneship.org/about/
> * http://webby.rubyforge.org/tutorial/
> 
> I like this tools, I'm wonder if there are similar tools in Python ?
>

rst2web
 

-- 
 -----------------------------------------------------------
| Radovan Garab?k http://kassiopeia.juls.savba.sk/~garabik/ |
| __..--^^^--..__    garabik @ kassiopeia.juls.savba.sk     |
 -----------------------------------------------------------
Antivirus alert: file .signature infected by signature virus.
Hi! I'm a signature virus! Copy me into your signature file to help me spread!


From __peter__ at web.de  Tue Mar  9 07:02:12 2010
From: __peter__ at web.de (Peter Otten)
Date: Tue, 09 Mar 2010 13:02:12 +0100
Subject: related lists mean value (golfed)
References: <mailman.470.1268087649.23598.python-list@python.org>
	<hn5801$sps$1@news.urz.uni-heidelberg.de>
	<hn5ad7$t8a$1@news.urz.uni-heidelberg.de>
Message-ID: <hn5dbo$ih6$02$1@news.t-online.com>

Michael Rudolf wrote:

> OK, I golfed it :D
> Go ahead and kill me ;)
> 
> x = [1 ,2, 8, 5, 0, 7]
> y = ['a', 'a', 'b', 'c', 'c', 'c' ]
> 
> def f(a,b,v={}):
>      try: v[a].append(b)
>      except: v[a]=[b]
>      def g(a): return sum(v[a])/len(v[a])
>      return g
> w = [g(i) for g,i in [(f(i,v),i) for i,v in zip(y,x)]]
> 
> print("w is now the list of averages, corresponding with y:\n \
>          \n x: %s \n y: %s \n w: %s \n" % (x, y, w))
> 
> Output:
> w is now the list of averages, corresponding with y:
> 
>   x: [1, 2, 8, 5, 0, 7]
>   y: ['a', 'a', 'b', 'c', 'c', 'c']
>   w: [1.5, 1.5, 8.0, 4.0, 4.0, 4.0]

>>> [sum(a for a,b in zip(x,y) if b==c)/y.count(c)for c in y]
[1.5, 1.5, 8.0, 4.0, 4.0, 4.0]

Peter


From dr.cg at 126.com  Tue Mar  9 07:19:22 2010
From: dr.cg at 126.com (CHEN Guang)
Date: Tue, 9 Mar 2010 20:19:22 +0800 (CST)
Subject: How to detect C Function block using python
Message-ID: <19912fa.87bc.12742dd77f8.Coremail.dr.cg@126.com>

In the source code of PythoidC ( http://pythoidc.googlecode.com ), I wrote a Parser for C header files with Python regular expression, not only functions but also structs macros. May be of some help. 
 

Hey All, 


I'm new in this community. I am writing a static analyzer for validating C Code using python and for that I'm looking for a python module/API that will detect Function block of a given C-File. I know simple function can be detected using push "{" and poping it if character "}" is found. This solution is actually done already, I want a robust API that can do more then that like detecting Function name parameters its return types etc.


Thanks!
Faheem
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From yinon.me at gmail.com  Tue Mar  9 07:27:59 2010
From: yinon.me at gmail.com (Yinon Ehrlich)
Date: Tue, 9 Mar 2010 04:27:59 -0800 (PST)
Subject: Duplicate keys in dict?
References: <21f87f60-fea2-417a-a092-64363b5b280e@y11g2000yqh.googlegroups.com>
Message-ID: <98e3cd64-063c-47e1-b671-04fd3fa16c71@z11g2000yqz.googlegroups.com>

On Mar 7, 6:23?pm, vsoler <vicente.so... at gmail.com> wrote:
> Hello,
>
> My code snippet reads data from excel ranges. First row and first
> column are column headers and row headers respectively. After reding
> the range I build a dict.
>
> What is the best approach for this problem? Can anybody help?

Have you tried xlread ? (http://www.python-excel.org/)
Best,
--  Yinon


From efiish at gmail.com  Tue Mar  9 08:51:05 2010
From: efiish at gmail.com (Lan Qing)
Date: Tue, 9 Mar 2010 21:51:05 +0800
Subject: a newbie's question
Message-ID: <ee9ad2071003090551v5def00c6jd04eef99f4545d20@mail.gmail.com>

Hi all,
      I'm a newbie of python programming language. I have used c/c++ for 5
years, and one year experience in Lua programming language. Can any one give
me some advice on learning python. Think you for any help!!

best regards!!!
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From casevh at gmail.com  Tue Mar  9 08:54:15 2010
From: casevh at gmail.com (casevh)
Date: Tue, 9 Mar 2010 05:54:15 -0800 (PST)
Subject: Calculating very large exponents in python
References: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>
	<f3cc57c61003071240x18b580bend946824ef7955b6c@mail.gmail.com> 
	<COL110-W1236CED756D3C9374CB0A2B7350@phx.gbl>
	<mailman.466.1268075137.23598.python-list@python.org> 
	<90e5f42d-b0d0-4578-82ea-9d0e5770048b@k2g2000pro.googlegroups.com>
Message-ID: <e0a6a1a2-77b4-48ac-81aa-4f34b6130e06@u19g2000prh.googlegroups.com>

On Mar 8, 10:39?pm, casevh <cas... at gmail.com> wrote:
> [also replying to Geremy since the OP's message doesn't appear...]
>
> On Mar 8, 11:05?am, geremy condra <debat... at gmail.com> wrote:
>
>
>
>
>
> > On Mon, Mar 8, 2010 at 2:15 AM, Fahad Ahmad <miracles... at hotmail.com> wrote:
> > > Thanks Geremy,
>
> > > That has been an absolute bump........... GOD i cant sit on my chair, it has
> > > worked even on 512 bit number and with no time..........
> > > superb i would say.
>
> > > lastly, i am using the code below to calculate Largest Prime factor of a
> > > number:
>
> > > print
> > > ('''=======================================================================??========'''
> > > ?????? '''????????????? CALCULATE? HIGHEST PRIME
> > > FACTOR????????????????????????????????? '''
>
> > > '''========================================================================??=======''')
>
> > > #!/usr/bin/env python
> > > def highest_prime_factor(n):
> > > ?? if isprime(n):
> > > ????? return n
> > > ?? for x in xrange(2,n ** 0.5 + 1):
> > > ????? if not n % x:
> > > ???????? return highest_prime_factor(n/x)
> > > def isprime(n):
> > > ?? for x in xrange(2,n ** 0.5 + 1):
> > > ????? if not n % x:
> > > ???????? return False
> > > ?? return True
> > > if? __name__ == "__main__":
> > > ?? import time
> > > ?? start = time.time()
> > > ?? print highest_prime_factor(1238162376372637826)
> > > ?? print time.time() - start
>
> > > the code works with a bit of delay on the number : "1238162376372637826" but
> > > extending it to
> > > (10902610991329142436630551158108608965062811746392577675456004845499113044??30471090261099132914243663055115810860896506281174639257767545600484549911?3?0443047)
> > > ?makes python go crazy. Is there any way just like above, i can have it
> > > calculated it in no time.
>
> > > thanks for the support.
>
> > If you're just looking for the largest prime factor I would suggest using
> > a fermat factorization attack. In the example you gave, it returns
> > nearly immediately.
>
> > Geremy Condra- Hide quoted text -
>
> > - Show quoted text -
>
> For a Python-based solution, you might want to look at pyecm (http://
> sourceforge.net/projects/pyecm/)
>
> On a system with gmpy installed also, pyecm found the following
> factors:
>
> 101, 521, 3121, 9901, 36479, 300623, 53397071018461,
> 1900381976777332243781
>
> There still is a 98 digit unfactored composite:
>
> 602525071745682437589111511878284384468144476539868422797968232621651594065?00174226172705680274911
>
> Factoring this remaining composite using ECM may not be practical.
>
> casevh- Hide quoted text -
>
> - Show quoted text -

After a few hours, the remaining factors are

6060517860310398033985611921721

and

9941808367425935774306988776021629111399536914790551022447994642391

casevh


From mehgcap at gmail.com  Tue Mar  9 08:55:39 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Tue, 9 Mar 2010 08:55:39 -0500
Subject: odd error
Message-ID: <bc7f680c1003090555o4d09c7b1l40bb21967d767885@mail.gmail.com>

Hi all,
In the same program I wrote about yesterday, I have a dictionary of
keystrokes which are captured. I just tried adding a new one, bringing
the total to 11. Here are entries 10 and 11; 10 has been working fine
for months.

  10 : (57, win32con.MOD_CONTROL),
  11 : (99, win32con.MOD_CONTROL | win32con.MOD_SHIFT)

Now, though, when I press ctrl-shift-c (keystroke 11), nothing
happens. Pressing any other keystroke after that will crash the
program with some sort of Python internal com server exception that I
have never seen before. When set to a keystroke I already use, such as
#10, the function called by #11 works just fine. Does anyone see a
problem with the above syntax? The trouble almost definitely has to be
there; again, using an already-working keystroke instead of making a
new one works perfectly, it is just when I add this new one that
things break.

-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From simon at brunningonline.net  Tue Mar  9 09:00:42 2010
From: simon at brunningonline.net (Simon Brunning)
Date: Tue, 9 Mar 2010 14:00:42 +0000
Subject: a newbie's question
In-Reply-To: <ee9ad2071003090551v5def00c6jd04eef99f4545d20@mail.gmail.com>
References: <ee9ad2071003090551v5def00c6jd04eef99f4545d20@mail.gmail.com>
Message-ID: <8c7f10c61003090600u692bfd8sdc287a73425ed47e@mail.gmail.com>

On 9 March 2010 13:51, Lan Qing <efiish at gmail.com> wrote:
> Hi all,
> ?? ? ?I'm a newbie of python programming language.

Welcome!

> I have used c/c++ for 5
> years, and one year experience in Lua programming language. Can any one give
> me some advice on learning python. Think you for any help!!

You'll find some useful starting points here -
<http://wiki.python.org/moin/BeginnersGuide/Programmers>.

-- 
Cheers,
Simon B.


From ssteinerx at gmail.com  Tue Mar  9 09:04:53 2010
From: ssteinerx at gmail.com (ssteinerX@gmail.com)
Date: Tue, 9 Mar 2010 09:04:53 -0500
Subject: Opportunity to author Python books- Packt Publishing.
In-Reply-To: <B9C59EAAF7F14FF98A361596DD5525B4@sonyPC>
References: <B9C59EAAF7F14FF98A361596DD5525B4@sonyPC>
Message-ID: <8E3C96A7-D2AF-4E5F-89CB-74E2F92668D0@gmail.com>

On Mar 8, 2010, at 6:25 AM, Kshipra Singh wrote:

I would be delighted to write a cookbook on the stuff I use every day: python for administering cloud servers.  

Thanks,

S
aka/Steve Steiner
aka/ssteinerX


> Hi All,
>  
> I am writing to you for Packt Publishing, the publishers computer related books.
>  
> We are planning to extend our catalogue of cookbooks and are currently inviting "Python" fanatics interested in writing a cookbook. So, if you love "Python" and are interested in writing a cookbook, please contact us with your book ideas atauthor at packtpub.com. Even if you do not have a book idea and are simply interested in authoring a cookbook, we are keen to hear from you.
>  
> More details about the opportunity are available at: http://authors.packtpub.com/content/python-fanatics-invited-write-packt
>  
> Thanks
> Kshipra Singh
> Author Relationship Manager
> Packt Publishing
> www.PacktPub.com
>  
> Skype: kshiprasingh15
> Twitter: http://twitter.com/kshipras
>  
> Interested in becoming an author? Visit http://authors.packtpub.com for all the information you need about writing for Packt.
> -- 
> http://mail.python.org/mailman/listinfo/python-list

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From python at bdurham.com  Tue Mar  9 09:09:01 2010
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 09 Mar 2010 09:09:01 -0500
Subject: Choosing a collection of common modules/packages for a general purpose
	reusable PY2EXE runtime
Message-ID: <1268143741.31835.1363885481@webmail.messagingengine.com>

We've decided to build a re-usable *general purpose* PY2EXE
"runtime" that can be shared by a number of scripts vs.
distributing a monolithic EXE for each of our scripts.

A list of the Python 2.6.4 compatible modules/packages we decided
to include (and exclude) in our "runtime" follows my signature.

Any suggestions on additions or deletions appreciated.

Thanks,
Malcolm

3rd party modules/packages:
- jsonpickle
- win32api
- winshell

We've included all modules from the Python standard library
EXCEPT the following:
http://www.python.org/doc/2.6.4/modindex.html
- aifc
- audioop
- bsddb
- Carbon
- dbhash
- distutils
- dumbdbm
- netrc
- plistlib
- robotparser
- ScrolledText
- shelve
- sunau
- tabnanny
- Tix
- Tkinter
- turtle
- whichdb
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From jjposner at optimum.net  Tue Mar  9 09:18:42 2010
From: jjposner at optimum.net (John Posner)
Date: Tue, 09 Mar 2010 09:18:42 -0500
Subject: imported var not being updated
In-Reply-To: <mailman.478.1268110509.23598.python-list@python.org>
References: <bc7f680c1003082022k4b1dd708i1d6e17cdf05db563@mail.gmail.com>
	<mailman.478.1268110509.23598.python-list@python.org>
Message-ID: <4B9658C2.1040707@optimum.net>

On 3/8/2010 11:55 PM, Gary Herron wrote:
<snip>
>
> The form of import you are using
> from helpers import mostRecent
> makes a *new* binding to the value in the module that's doing the
> import.

<snip>

> What you can do, is not make a separate binding, but reach into the
> helpers module to get the value there. Like this:
>
> import helpers
> print helpers.mostRecent
>

Gary, are you asserting that in these separate situations:

one.py:

   from helpers import mostRecent
   x = mostRecent

two.py:

   import helpers
   x = helpers.mostRecent


... the name "x" will be bound to different objects?

Tx,
John


From xahlee at gmail.com  Tue Mar  9 09:24:42 2010
From: xahlee at gmail.com (Xah Lee)
Date: Tue, 9 Mar 2010 06:24:42 -0800 (PST)
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<4b90a1f8$0$1629$742ec2ed@news.sonic.net>
	<0d381135-730a-45e4-9225-9ba2a29b77fe@k2g2000pro.googlegroups.com>
	<Xns9D35C3BFCE829duncanbooth@127.0.0.1>
Message-ID: <13c167f4-5e37-48a0-a480-3494c212035c@k5g2000pra.googlegroups.com>

On Mar 8, 11:14?am, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> Xah Lee <xah... at gmail.com> wrote:
> > For example, consider, if you are within world's top 100th user of
> > database in terms of database size, such as Google, then it may be
> > that the off-the-shelf tools may be limiting. But how many users
> > really have such massive size of data?
>
> You've totally missed the point. It isn't the size of the data you have
> today that matters, it's the size of data you could have in several years'
> time.

so, you saying, in several years, we'd all become the world's top 100
database users in terms of size, like Google?

  Xah
? http://xahlee.org/

?


From benjamin.kaplan at case.edu  Tue Mar  9 09:25:38 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Tue, 9 Mar 2010 09:25:38 -0500
Subject: imported var not being updated
In-Reply-To: <4B9658C2.1040707@optimum.net>
References: <bc7f680c1003082022k4b1dd708i1d6e17cdf05db563@mail.gmail.com>
	<mailman.478.1268110509.23598.python-list@python.org>
	<4B9658C2.1040707@optimum.net>
Message-ID: <ec96e1391003090625o55527930u9e5afc69e5d882dc@mail.gmail.com>

On Tue, Mar 9, 2010 at 9:18 AM, John Posner <jjposner at optimum.net> wrote:

> On 3/8/2010 11:55 PM, Gary Herron wrote:
> <snip>
>
>
>> The form of import you are using
>> from helpers import mostRecent
>> makes a *new* binding to the value in the module that's doing the
>> import.
>>
>
> <snip>
>
>
>  What you can do, is not make a separate binding, but reach into the
>> helpers module to get the value there. Like this:
>>
>> import helpers
>> print helpers.mostRecent
>>
>>
> Gary, are you asserting that in these separate situations:
>
> one.py:
>
>  from helpers import mostRecent
>  x = mostRecent
>
> two.py:
>
>  import helpers
>  x = helpers.mostRecent
>
>
> ... the name "x" will be bound to different objects?
>
> Tx,
> John
>
>
No. the name x will be bound to the same object. It's the other way that
gives a problem

from helpers import mostRecent

works like

import helpers
mostRecent = helpers.mostRecent
del helpers

so when you do

mostRecent = x

it rebinds "mostRecent" in the current scope but doesn't affect
helpers.mostRecent, the name in the "helpers" module.


> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From python at bdurham.com  Tue Mar  9 09:27:49 2010
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 09 Mar 2010 09:27:49 -0500
Subject: (updated) Choosing a collection of common modules/packages for a
	general purpose    reusable PY2EXE runtime
In-Reply-To: <1268143741.31835.1363885481@webmail.messagingengine.com>
References: <1268143741.31835.1363885481@webmail.messagingengine.com>
Message-ID: <1268144869.2338.1363892987@webmail.messagingengine.com>

We've decided to build a re-usable *general purpose* PY2EXE
"runtime" that can be shared by a number of scripts vs.
distributing a monolithic EXE for each of our scripts.

A list of the Python 2.6.4 compatible modules/packages we decided
to include (and exclude) in our "runtime" follows my signature.

Any suggestions on additions or deletions appreciated.

Thanks,
Malcolm

3rd party modules/packages:
- jsonpickle
- wmi <--- forgot this one in my original post
- win32api
- winshell

We've included all modules from the Python standard library
EXCEPT the following:
http://www.python.org/doc/2.6.4/modindex.html
- aifc
- audioop
- bsddb
- Carbon
- dbhash
- distutils
- dumbdbm
- netrc
- plistlib
- robotparser
- ScrolledText
- shelve
- sunau
- tabnanny
- Tix
- Tkinter
- turtle
- whichdb


From bruno.42.desthuilliers at websiteburo.invalid  Tue Mar  9 09:48:59 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 09 Mar 2010 15:48:59 +0100
Subject: imported var not being updated
In-Reply-To: <4B9658C2.1040707@optimum.net>
References: <bc7f680c1003082022k4b1dd708i1d6e17cdf05db563@mail.gmail.com>
	<mailman.478.1268110509.23598.python-list@python.org>
	<4B9658C2.1040707@optimum.net>
Message-ID: <4b965fde$0$14410$426a74cc@news.free.fr>

John Posner a ?crit :
> On 3/8/2010 11:55 PM, Gary Herron wrote:
> <snip>
>>
>> The form of import you are using
>> from helpers import mostRecent
>> makes a *new* binding to the value in the module that's doing the
>> import.
> 
> <snip>
> 
>> What you can do, is not make a separate binding, but reach into the
>> helpers module to get the value there. Like this:
>>
>> import helpers
>> print helpers.mostRecent
>>
> 
> Gary, are you asserting that in these separate situations:
> 
> one.py:
> 
>   from helpers import mostRecent
>   x = mostRecent
> 
> two.py:
> 
>   import helpers
>   x = helpers.mostRecent
> 
> 
> ... the name "x" will be bound to different objects?

Nope. What he's saying is that one.x and two.x are two different names - 
each living in it's own namespace - that happen to be bound to the same 
object. Now rebiding one.x to a different object will _of course_ have 
no impact on the object two.x is bound to.

That's exactly the same as:

one = dict()
two = dict()

# one['x'] and two['x'] refer to the same object
one['x'] = two['x'] = ["foo", "bar"]
print one['x'], two['x'], one['x'] is two['x']

# mutating one['x'], visible in two['x']
# (of course since it's the same object)
one['x'].append("baaz")
print one['x'], two['x'], one['x'] is two['x']

# now rebind one['x']
one['x'] = 42

# obvious result: one['x'] and two['x'] now refer to 2 different objects
print one['x'], two['x'], one['x'] is two['x']


If in doubt about namespaces, think dicts. Namespaces are like dicts - 
and are often nothing else that a plain old dict FWIW.

HTH


From spamfresser at ch3ka.de  Tue Mar  9 10:00:00 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Tue, 09 Mar 2010 16:00:00 +0100
Subject: related lists mean value (golfed)
In-Reply-To: <hn5dbo$ih6$02$1@news.t-online.com>
References: <mailman.470.1268087649.23598.python-list@python.org>
	<hn5801$sps$1@news.urz.uni-heidelberg.de>
	<hn5ad7$t8a$1@news.urz.uni-heidelberg.de>
	<hn5dbo$ih6$02$1@news.t-online.com>
Message-ID: <hn5npf$2kg$1@news.urz.uni-heidelberg.de>

Am 09.03.2010 13:02, schrieb Peter Otten:
>>>> [sum(a for a,b in zip(x,y) if b==c)/y.count(c)for c in y]
> [1.5, 1.5, 8.0, 4.0, 4.0, 4.0]
> Peter

... pwned.
Should be the fastest and shortest way to do it.

I tried to do something like this, but my brain hurt while trying to 
visualize list comprehension evaluation orders ;)

Regards,
Michael


From kishoreinme at gmail.com  Tue Mar  9 10:01:22 2010
From: kishoreinme at gmail.com (kishore)
Date: Tue, 9 Mar 2010 07:01:22 -0800 (PST)
Subject: pyserial script doesnt execute properly
References: <c083a958-7320-4fd3-82ae-cf4da7808af6@u15g2000prd.googlegroups.com>
	<4b9612bc$0$6059$426a74cc@news.free.fr>
Message-ID: <bf3cbd2a-eb4c-455c-9b01-de44d6b35f60@v34g2000prm.googlegroups.com>

On Mar 9, 2:19?pm, News123 <news... at free.fr> wrote:
> Hi,
>
>
>
> kishore wrote:
> > hello there
>
> > Iam using python 2.5.4
> > pyserial ?2.4
> > pywin32-214
>
> > on windows 7
>
> > i hav a small test script written to query a serial device (arduino)
> > and get back reply appropriately
>
> > ////file: test.py
>
> > import serial
> > print 'hi'
> > ser=serial.Serial(port='\\.\COM2', baudrate=9600)
> > ser.close()
> > ser.open()
> > ser.write('1')
> > ser.readline()
> > ser.readline()
> > ser.close()
>
> > the device waits for '1' through its serial interface and print two
> > lines if it gets '1'
>
> > "Some Data found" and "Header received"
>
> > the script works on IDLE well when given one line at a time
>
> > but when given in command line as python test.py it prints hi and wait
> > forever
>
> Unfortunately I don't remember exacty, but try following:
>
> close IDLE and try then to start the script from the command line.
> I remember having had a problem with idle, that it did not always close
> the UART port
> (especially, when an error (e.g. syntax) occured before the close statement)
>
> bye
>
> N


Thanks for your response
i tried closing idle and the following code prints
port opened
Write failed

code:

import serial
import time
ser=serial.Serial(port='\\.\COM2', baudrate=9600)
if ser:
	print 'port opened'
ser.open()
if ser.write('1'):
	print 'Write success'
else:
	print 'write failed'

time.sleep(1)

a=ser.readline()
time.sleep(1)
b=ser.readline()
print b
ser.close()



I believe this might be a serial port access error.
how to solve this?
Any suggestions?


From bruno.42.desthuilliers at websiteburo.invalid  Tue Mar  9 10:02:04 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 09 Mar 2010 16:02:04 +0100
Subject: NoSQL Movement?
In-Reply-To: <mailman.341.1267790217.23598.python-list@python.org>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>	<mailman.256.1267655008.23598.python-list@python.org>	<BABjn.11012$pv.4575@news-server.bigpond.net.au>	<mailman.270.1267671204.23598.python-list@python.org>	<4b90e2d0$0$10096$426a34cc@news.free.fr>
	<mailman.341.1267790217.23598.python-list@python.org>
Message-ID: <4b9662ee$0$9131$426a74cc@news.free.fr>

mk a ?crit :
> Bruno Desthuilliers wrote:
>>> Well, Zope is backed by an object database rather than a relational one.
>>
>> And it ended up being a *major* PITA on all Zope projects I've worked 
>> on...
> 
> Care to write a few sentences on nature of problems with zodb? I was 
> flirting with the thought of using it on some project.

Would require more than a few sentences. But mostly, it's about the very 
nature of the Zodb : it's a giant graph of Python objects.

So :
1/ your "data" are _very_ tightly dependant on the language and 
applicative code
2/ you have to hand-write each and every graph traversal
3/ accessing a given object usually loads quite a few others in memory


I once thought the Zodb was cool.


From stefan_ml at behnel.de  Tue Mar  9 10:07:54 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 09 Mar 2010 16:07:54 +0100
Subject: remove element with ElementTree
In-Reply-To: <8ad6319f-97f1-46b7-b89e-d455bd89ad03@b9g2000pri.googlegroups.com>
References: <790217d6-e230-44e8-9aa1-4f8c7a66170c@g7g2000yqe.googlegroups.com>
	<8ad6319f-97f1-46b7-b89e-d455bd89ad03@b9g2000pri.googlegroups.com>
Message-ID: <hn5o8b$pud$1@dough.gmane.org>

Justin Ezequiel, 09.03.2010 10:34:
> On Mar 9, 11:35 am, tdan<df.tr... at gmail.com>  wrote:
>> I have been using ElementTree to write an app, and would like to
>> simply remove an element.
>> But in ElementTree, you must know both the parent and the child
>> element to do this.
>> There is no getparent() function, so I am stuck if I only have an
>> element.
>
> see http://effbot.org/zone/element.htm#accessing-parents

Also note that there is an independent ElementTree implementation called 
lxml.etree, which has parent pointers.

Stefan



From showell30 at yahoo.com  Tue Mar  9 10:21:15 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Tue, 9 Mar 2010 07:21:15 -0800 (PST)
Subject: related lists mean value
References: <mailman.470.1268087649.23598.python-list@python.org> 
	<4B95B4FF.1070407@optimum.net>
Message-ID: <5574554b-1d62-4faf-bb89-34cb431741cd@q2g2000pre.googlegroups.com>

On Mar 8, 6:39?pm, John Posner <jjpos... at optimum.net> wrote:
> On 3/8/2010 5:34 PM, dimitri pater - serpia wrote:
>
> > Hi,
>
> > I have two related lists:
> > x = [1 ,2, 8, 5, 0, 7]
> > y = ['a', 'a', 'b', 'c', 'c', 'c' ]
>
> > what I need is a list representing the mean value of 'a', 'b' and 'c'
> > while maintaining the number of items (len):
> > w = [1.5, 1.5, 8, 4, 4, 4]
>
> > I have looked at iter(tools) and next(), but that did not help me. I'm
> > a bit stuck here, so your help is appreciated!
>
> Nobody expects object-orientation (or the Spanish Inquisition):
>

Heh.  Yep, I avoided OO for this.  Seems like a functional problem.
My solution is functional on the outside, imperative on the inside.
You could add recursion here, but I don't think it would be as
straightforward.

def num_dups_at_head(lst):
    assert len(lst) > 0
    val = lst[0]
    i = 1
    while i < len(lst) and lst[i] == val:
        i += 1
    return i

def smooth(x, y):
    result = []
    while x:
        cnt = num_dups_at_head(y)
        avg = sum(x[:cnt]) * 1.0 / cnt
        result += [avg] * cnt
        x = x[cnt:]
        y = y[cnt:]
    return result


> #-------------------------
> from collections import defaultdict
>
> class Tally:
> ? ? ?def __init__(self, id=None):
> ? ? ? ? ?self.id = id
> ? ? ? ? ?self.total = 0
> ? ? ? ? ?self.count = 0
>
> x = [1 ,2, 8, 5, 0, 7]
> y = ['a', 'a', 'b', 'c', 'c', 'c']
>
> # gather data
> tally_dict = defaultdict(Tally)
> for i in range(len(x)):
> ? ? ?obj = tally_dict[y[i]]
> ? ? ?obj.id = y[i]
> ? ? ?obj.total += x[i]
> ? ? ?obj.count += 1
>
> # process data
> result_list = []
> for key in sorted(tally_dict):
> ? ? ?obj = tally_dict[key]
> ? ? ?mean = 1.0 * obj.total / obj.count
> ? ? ?result_list.extend([mean] * obj.count)
> print result_list
> #-------------------------


From kishoreinme at gmail.com  Tue Mar  9 10:30:32 2010
From: kishoreinme at gmail.com (kishore)
Date: Tue, 9 Mar 2010 07:30:32 -0800 (PST)
Subject: pyserial script doesnt execute properly
References: <c083a958-7320-4fd3-82ae-cf4da7808af6@u15g2000prd.googlegroups.com>
	<4b9612bc$0$6059$426a74cc@news.free.fr>
	<bf3cbd2a-eb4c-455c-9b01-de44d6b35f60@v34g2000prm.googlegroups.com>
Message-ID: <6596caf4-8d36-40b4-8e8d-a5ed2a18f245@z1g2000prc.googlegroups.com>

On Mar 9, 8:01?pm, kishore <kishorei... at gmail.com> wrote:
> On Mar 9, 2:19?pm, News123 <news... at free.fr> wrote:
>
>
>
> > Hi,
>
> > kishore wrote:
> > > hello there
>
> > > Iam using python 2.5.4
> > > pyserial ?2.4
> > > pywin32-214
>
> > > on windows 7
>
> > > i hav a small test script written to query a serial device (arduino)
> > > and get back reply appropriately
>
> > > ////file: test.py
>
> > > import serial
> > > print 'hi'
> > > ser=serial.Serial(port='\\.\COM2', baudrate=9600)
> > > ser.close()
> > > ser.open()
> > > ser.write('1')
> > > ser.readline()
> > > ser.readline()
> > > ser.close()
>
> > > the device waits for '1' through its serial interface and print two
> > > lines if it gets '1'
>
> > > "Some Data found" and "Header received"
>
> > > the script works on IDLE well when given one line at a time
>
> > > but when given in command line as python test.py it prints hi and wait
> > > forever
>
> > Unfortunately I don't remember exacty, but try following:
>
> > close IDLE and try then to start the script from the command line.
> > I remember having had a problem with idle, that it did not always close
> > the UART port
> > (especially, when an error (e.g. syntax) occured before the close statement)
>
> > bye
>
> > N
>
> Thanks for your response
> i tried closing idle and the following code prints
> port opened
> Write failed
>
> code:
>
> import serial
> import time
> ser=serial.Serial(port='\\.\COM2', baudrate=9600)
> if ser:
> ? ? ? ? print 'port opened'
> ser.open()
> if ser.write('1'):
> ? ? ? ? print 'Write success'
> else:
> ? ? ? ? print 'write failed'
>
> time.sleep(1)
>
> a=ser.readline()
> time.sleep(1)
> b=ser.readline()
> print b
> ser.close()
>
> I believe this might be a serial port access error.
> how to solve this?
> Any suggestions?

have found one more person with same problem but no solution

http://mail.python.org/pipermail/python-win32/2009-January/008613.html


From eckhardt at satorlaser.com  Tue Mar  9 10:40:59 2010
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Tue, 09 Mar 2010 16:40:59 +0100
Subject: odd error
References: <mailman.486.1268142942.23598.python-list@python.org>
Message-ID: <bp6i67-0ad.ln1@satorlaser.homedns.org>

Alex Hall wrote:
> Now, though, when I press ctrl-shift-c (keystroke 11), nothing
> happens.

Control-C sends a special signal to the console, like Control-Break.

> Pressing any other keystroke after that will crash the program
> with some sort of Python internal com server exception that I
> have never seen before.

Neither do I, in particular since you don't share that rare gem with us. ;)

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From kishoreinme at gmail.com  Tue Mar  9 10:42:21 2010
From: kishoreinme at gmail.com (kishore)
Date: Tue, 9 Mar 2010 07:42:21 -0800 (PST)
Subject: pyserial script doesnt execute properly
References: <c083a958-7320-4fd3-82ae-cf4da7808af6@u15g2000prd.googlegroups.com>
	<4b9612bc$0$6059$426a74cc@news.free.fr>
	<bf3cbd2a-eb4c-455c-9b01-de44d6b35f60@v34g2000prm.googlegroups.com>
Message-ID: <2c849953-6556-4f5b-b88c-1fae6e4f27ce@t20g2000yqe.googlegroups.com>

On Mar 9, 8:01?pm, kishore <kishorei... at gmail.com> wrote:
> On Mar 9, 2:19?pm, News123 <news... at free.fr> wrote:
>
>
>
> > Hi,
>
> > kishore wrote:
> > > hello there
>
> > > Iam using python 2.5.4
> > > pyserial ?2.4
> > > pywin32-214
>
> > > on windows 7
>
> > > i hav a small test script written to query a serial device (arduino)
> > > and get back reply appropriately
>
> > > ////file: test.py
>
> > > import serial
> > > print 'hi'
> > > ser=serial.Serial(port='\\.\COM2', baudrate=9600)
> > > ser.close()
> > > ser.open()
> > > ser.write('1')
> > > ser.readline()
> > > ser.readline()
> > > ser.close()
>
> > > the device waits for '1' through its serial interface and print two
> > > lines if it gets '1'
>
> > > "Some Data found" and "Header received"
>
> > > the script works on IDLE well when given one line at a time
>
> > > but when given in command line as python test.py it prints hi and wait
> > > forever
>
> > Unfortunately I don't remember exacty, but try following:
>
> > close IDLE and try then to start the script from the command line.
> > I remember having had a problem with idle, that it did not always close
> > the UART port
> > (especially, when an error (e.g. syntax) occured before the close statement)
>
> > bye
>
> > N
>
> Thanks for your response
> i tried closing idle and the following code prints
> port opened
> Write failed
>
> code:
>
> import serial
> import time
> ser=serial.Serial(port='\\.\COM2', baudrate=9600)
> if ser:
> ? ? ? ? print 'port opened'
> ser.open()
> if ser.write('1'):
> ? ? ? ? print 'Write success'
> else:
> ? ? ? ? print 'write failed'
>
> time.sleep(1)
>
> a=ser.readline()
> time.sleep(1)
> b=ser.readline()
> print b
> ser.close()
>
> I believe this might be a serial port access error.
> how to solve this?
> Any suggestions?

have found one more person with same problem but no solution

http://mail.python.org/pipermail/python-win32/2009-January/008613.html


From stefan_ml at behnel.de  Tue Mar  9 10:45:48 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 09 Mar 2010 16:45:48 +0100
Subject: remove element with ElementTree
In-Reply-To: <790217d6-e230-44e8-9aa1-4f8c7a66170c@g7g2000yqe.googlegroups.com>
References: <790217d6-e230-44e8-9aa1-4f8c7a66170c@g7g2000yqe.googlegroups.com>
Message-ID: <hn5qfd$674$1@dough.gmane.org>

tdan, 09.03.2010 04:35:
> I have been using ElementTree to write an app, and would like to
> simply remove an element.
> But in ElementTree, you must know both the parent and the child
> element to do this.
> There is no getparent() function, so I am stuck if I only have an
> element.
>
> I am iterating over a table and getting all<td>  tags, checking their
> text, and conditionally deleting them:
>
> def RemoveElementWithText( topEl, subEl, text ):

Note that all-camel-case names are rather unusual for function names and 
rather used for class names. See PEP 8 for a style guide.


> 	for el in topEl.getiterator( subEl ):
> 		if el.text = text:
> 			break
> 	else:
> 		el = None
> 	return el
>
> RemoveElementWithText( table, 'td', 'sometext' )
>
> My table is like so:
>
> <table>
>   <thead>...
>   <tbody><tr><td>...
>
> Is there any way to do this in ElementTree?

I think the easiest is to iterate not over the elements themselves, but 
over their parents, and then to remove all children of the specified tag in 
each step.

Stefan



From robert.kern at gmail.com  Tue Mar  9 11:01:07 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 09 Mar 2010 10:01:07 -0600
Subject: scipy sparse matrix question
In-Reply-To: <1jf28jr.7abra61nwu04pN%see@sig.for.address>
References: <1jf28jr.7abra61nwu04pN%see@sig.for.address>
Message-ID: <hn5rc3$a2r$1@dough.gmane.org>

On 2010-03-09 00:14 AM, Victor Eijkhout wrote:
> I can't find any detailed information about scipy.sparse.

The place to ask would be on scipy-user:

   http://www.scipy.org/Mailing_Lists

> My specific question: what does "for x in A" give me when A is a sparse
> matrix? It seems to yield all nonzero locations,

No, it gives you rows, just like a dense 2D array.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From __peter__ at web.de  Tue Mar  9 11:10:26 2010
From: __peter__ at web.de (Peter Otten)
Date: Tue, 09 Mar 2010 17:10:26 +0100
Subject: related lists mean value (golfed)
References: <mailman.470.1268087649.23598.python-list@python.org>
	<hn5801$sps$1@news.urz.uni-heidelberg.de>
	<hn5ad7$t8a$1@news.urz.uni-heidelberg.de>
	<hn5dbo$ih6$02$1@news.t-online.com>
	<hn5npf$2kg$1@news.urz.uni-heidelberg.de>
Message-ID: <hn5rt6$6m1$03$1@news.t-online.com>

Michael Rudolf wrote:

> Am 09.03.2010 13:02, schrieb Peter Otten:
>>>>> [sum(a for a,b in zip(x,y) if b==c)/y.count(c)for c in y]
>> [1.5, 1.5, 8.0, 4.0, 4.0, 4.0]
>> Peter
> 
> ... pwned.
> Should be the fastest and shortest way to do it.

It may be short, but it is not particularly efficient. A dict-based approach 
is probably the fastest. If y is guaranteed to be sorted itertools.groupby() 
may also be worth a try.

$ cat tmp_average_compare.py
from __future__ import division
from collections import defaultdict
try:
    from itertools import izip as zip
except ImportError:
    pass

x = [1 ,2, 8, 5, 0, 7]
y = ['a', 'a', 'b', 'c', 'c', 'c' ]

def f(x=x, y=y):
    p = defaultdict(int)
    q = defaultdict(int)
    for a, b in zip(x, y):
        p[b] += a
        q[b] += 1
    return [p[b]/q[b] for b in y]

def g(x=x, y=y):
    return [sum(a for a,b in zip(x,y)if b==c)/y.count(c)for c in y]

if __name__ == "__main__":
    print(f())
    print(g())
    assert f() == g()
$ python3 -m timeit -s 'from tmp_average_compare import f, g' 'f()'
100000 loops, best of 3: 11.4 usec per loop
$ python3 -m timeit -s 'from tmp_average_compare import f, g' 'g()'
10000 loops, best of 3: 22.8 usec per loop

Peter


From mehgcap at gmail.com  Tue Mar  9 11:18:05 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Tue, 9 Mar 2010 11:18:05 -0500
Subject: odd error
In-Reply-To: <bp6i67-0ad.ln1@satorlaser.homedns.org>
References: <mailman.486.1268142942.23598.python-list@python.org>
	<bp6i67-0ad.ln1@satorlaser.homedns.org>
Message-ID: <bc7f680c1003090818t537c40a9ue0a19a5bc7ba0083@mail.gmail.com>

I know ctrl-c kills a process in the shell, but these are global
hotkeys and all others work fine. You made me discover something,
though: the error only happens if ctrl-shift-c is pressed when in the
shell from where the program was run; when pressed anywhere else, the
keystroke does nothing at all. Is there something I am missing about
these keystroke dictionaries? It seems like they do not work unless
the keycodes are in numerical order and are not separated by more than
one number. Currently, my dictionary consists of the numbers 1-0 on
the top of the keyboard, but adding any other keycode, like the 99 in
my original message, will cause that keystroke to do absolutely
nothing. Thanks to your response, I suspect the problem is something
to do with the keypress being captured by the shell. Still, not being
able to use anything except numbers is very annoying!! Why would this
be happening?


On 3/9/10, Ulrich Eckhardt <eckhardt at satorlaser.com> wrote:
> Alex Hall wrote:
>> Now, though, when I press ctrl-shift-c (keystroke 11), nothing
>> happens.
>
> Control-C sends a special signal to the console, like Control-Break.
>
>> Pressing any other keystroke after that will crash the program
>> with some sort of Python internal com server exception that I
>> have never seen before.
>
> Neither do I, in particular since you don't share that rare gem with us. ;)
>
> Uli
>
> --
> Sator Laser GmbH
> Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From showell30 at yahoo.com  Tue Mar  9 11:29:44 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Tue, 9 Mar 2010 08:29:44 -0800 (PST)
Subject: related lists mean value
References: <mailman.470.1268087649.23598.python-list@python.org>
Message-ID: <253e4e31-21f7-42cc-8276-72afe8702946@q2g2000pre.googlegroups.com>

On Mar 8, 2:34?pm, dimitri pater - serpia <dimitri.pa... at gmail.com>
wrote:
> Hi,
>
> I have two related lists:
> x = [1 ,2, 8, 5, 0, 7]
> y = ['a', 'a', 'b', 'c', 'c', 'c' ]
>
> what I need is a list representing the mean value of 'a', 'b' and 'c'
> while maintaining the number of items (len):
> w = [1.5, 1.5, 8, 4, 4, 4]
>

What results are you expecting if you have multiple runs of 'a' in a
longer list?


From rrpsteps at gmail.com  Tue Mar  9 11:33:40 2010
From: rrpsteps at gmail.com (Rikal)
Date: Tue, 9 Mar 2010 08:33:40 -0800 (PST)
Subject: 1794 - Best, Cheapest Web-Hosting, Domain at $1.99!
Message-ID: <6cb49bce-7913-4e60-a458-5650f95ddc03@15g2000yqi.googlegroups.com>

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From mail at timgolden.me.uk  Tue Mar  9 11:34:03 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 09 Mar 2010 16:34:03 +0000
Subject: odd error
In-Reply-To: <bc7f680c1003090555o4d09c7b1l40bb21967d767885@mail.gmail.com>
References: <bc7f680c1003090555o4d09c7b1l40bb21967d767885@mail.gmail.com>
Message-ID: <4B96787B.3030907@timgolden.me.uk>

On 09/03/2010 13:55, Alex Hall wrote:
> Hi all,
> In the same program I wrote about yesterday, I have a dictionary of
> keystrokes which are captured. I just tried adding a new one, bringing
> the total to 11. Here are entries 10 and 11; 10 has been working fine
> for months.
>
>    10 : (57, win32con.MOD_CONTROL),
>    11 : (99, win32con.MOD_CONTROL | win32con.MOD_SHIFT)
>
> Now, though, when I press ctrl-shift-c (keystroke 11)

Ctrl-C (with or without any other modifier) has a special meaning
which overrides any hotkeys. You may be able to do something by
adding a break handler through SetConsoleCtrlHandler (exposed in
win32api). But it would obviously be a special case outside your
normal control flow.

TJG


From gherron at islandtraining.com  Tue Mar  9 11:34:38 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Tue, 09 Mar 2010 08:34:38 -0800
Subject: imported var not being updated
In-Reply-To: <4B9658C2.1040707@optimum.net>
References: <bc7f680c1003082022k4b1dd708i1d6e17cdf05db563@mail.gmail.com>
	<mailman.478.1268110509.23598.python-list@python.org>
	<4B9658C2.1040707@optimum.net>
Message-ID: <4B96789E.8040402@islandtraining.com>

John Posner wrote:
> On 3/8/2010 11:55 PM, Gary Herron wrote:
> <snip>
>>
>> The form of import you are using
>> from helpers import mostRecent
>> makes a *new* binding to the value in the module that's doing the
>> import.
>
> <snip>
>
>> What you can do, is not make a separate binding, but reach into the
>> helpers module to get the value there. Like this:
>>
>> import helpers
>> print helpers.mostRecent
>>
>
> Gary, are you asserting that in these separate situations:
>
> one.py:
>
>   from helpers import mostRecent
>   x = mostRecent
>
> two.py:
>
>   import helpers
>   x = helpers.mostRecent
>
>
> ... the name "x" will be bound to different objects?
>
> Tx,
> John

Hi John,


No they are bound to the same object ... to start with.  But if, as the 
OP indicated, something in the helpers module changes that module's 
binding of 'mostRecent', then the only helpers.mostRecent in your two.py 
will notice that change.  The variable 'x' in both samples and the 
'mostRecent' value in one.py will remain unchanged.

That's true for mutable *and* immutable values -- however, mutable 
values admit a further consideration:  Since all 'x's and 'mostRecent's 
refer to the same value, any mutation is noticed in all cases.   But, 
*any* assignment ( with = or of the form *from helpers import 
mostRecent* ) breaks the reference to the shared value.

Gary Herron


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From mail at timgolden.me.uk  Tue Mar  9 11:36:32 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 09 Mar 2010 16:36:32 +0000
Subject: odd error
In-Reply-To: <4B96787B.3030907@timgolden.me.uk>
References: <bc7f680c1003090555o4d09c7b1l40bb21967d767885@mail.gmail.com>
	<4B96787B.3030907@timgolden.me.uk>
Message-ID: <4B967910.1090108@timgolden.me.uk>

On 09/03/2010 16:34, Tim Golden wrote:
> On 09/03/2010 13:55, Alex Hall wrote:
>> Hi all,
>> In the same program I wrote about yesterday, I have a dictionary of
>> keystrokes which are captured. I just tried adding a new one, bringing
>> the total to 11. Here are entries 10 and 11; 10 has been working fine
>> for months.
>>
>>     10 : (57, win32con.MOD_CONTROL),
>>     11 : (99, win32con.MOD_CONTROL | win32con.MOD_SHIFT)
>>
>> Now, though, when I press ctrl-shift-c (keystroke 11)
>
> Ctrl-C (with or without any other modifier) has a special meaning
> which overrides any hotkeys. You may be able to do something by
> adding a break handler through SetConsoleCtrlHandler (exposed in
> win32api). But it would obviously be a special case outside your
> normal control flow.

... or you could use SetConsoleMode to disable input processing. But
that would only work (I think) in one console, not at a global level.

TJG


From showell30 at yahoo.com  Tue Mar  9 11:38:35 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Tue, 9 Mar 2010 08:38:35 -0800 (PST)
Subject: related lists mean value
References: <mailman.470.1268087649.23598.python-list@python.org> 
	<4B95B4FF.1070407@optimum.net>
	<5574554b-1d62-4faf-bb89-34cb431741cd@q2g2000pre.googlegroups.com>
Message-ID: <08f0cc42-1d5b-4e45-be51-b68c617bd554@m27g2000prl.googlegroups.com>

On Mar 9, 7:21?am, Steve Howell <showel... at yahoo.com> wrote:
>
> def num_dups_at_head(lst):
> ? ? assert len(lst) > 0
> ? ? val = lst[0]
> ? ? i = 1
> ? ? while i < len(lst) and lst[i] == val:
> ? ? ? ? i += 1
> ? ? return i
>
> def smooth(x, y):
> ? ? result = []
> ? ? while x:
> ? ? ? ? cnt = num_dups_at_head(y)
> ? ? ? ? avg = sum(x[:cnt]) * 1.0 / cnt
> ? ? ? ? result += [avg] * cnt
> ? ? ? ? x = x[cnt:] # expensive?
> ? ? ? ? y = y[cnt:] # expensive?
> ? ? return result
>

BTW I recognize that my solution would be inefficient for long lists,
unless the underlying list implementation had copy-on-write.  I'm
wondering what the easiest fix would be.  I tried a quick shot at
islice(), but the lack of len() thwarted me.





From theller at ctypes.org  Tue Mar  9 11:43:23 2010
From: theller at ctypes.org (Thomas Heller)
Date: Tue, 09 Mar 2010 17:43:23 +0100
Subject: libc Sleep api performs a busy waiting
In-Reply-To: <27e52ad11003082013h658cf7deu761e7d14198af9f1@mail.gmail.com>
References: <a52b97c0-7266-4bc6-9ab4-3a8688120a6c@u19g2000prh.googlegroups.com>	<hn2qta$886$2@dough.gmane.org>
	<27e52ad11003082013h658cf7deu761e7d14198af9f1@mail.gmail.com>
Message-ID: <hn5trb$k6o$1@dough.gmane.org>

Joe Fox schrieb:
> Hi,
> 
>  actually i have simplified my scenario a lot here ,
> 
> In my actual case , i have to call a C-api which blocks on  c select , in a
> separate thread.
> 
> my thread is getting struck in that api , and thus blocking all the other
> threads.
> Can you point to something which will help me call this blocking C-api call
> without my thread getting struck.
> 
ctypes.  Releases the GIL before calling C api functions.



From mehgcap at gmail.com  Tue Mar  9 11:48:10 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Tue, 9 Mar 2010 11:48:10 -0500
Subject: odd error
In-Reply-To: <4B96787B.3030907@timgolden.me.uk>
References: <bc7f680c1003090555o4d09c7b1l40bb21967d767885@mail.gmail.com>
	<4B96787B.3030907@timgolden.me.uk>
Message-ID: <bc7f680c1003090848v3f4bbf28w9df15cd67f15c3e0@mail.gmail.com>

Okay, I changed the keycode from 99 (c) to 107 (k), and the errors
have disappeared. However, now the function that should be called is
not. As I said in a previous message, I have always had trouble with
this sort of keystroke dictionary. It seems like, if a keycode is out
of order or not one more than the number before it, the function to
which it is tied will not get called. I am using the message looping
mode from Tim Golden's website, and it works beautifully until I try
to put an out-of-sequence keycode into the keystrokes dictionary. The
dictionary contains numbers 0-9 (48-57) and all is well, but when I
put in this 107 code then the function tied to 107 is not called, yet
the ones tied to 48-57 still work normally. Why would the sequence
matter, or does it not and I am doing something else wrong? Here is a
sample of my dictionary:

keys.append({
  1 : (48, win32con.MOD_CONTROL),
  2 : (49, win32con.MOD_CONTROL),
  3 : (50, win32con.MOD_CONTROL),
  4 : (51, win32con.MOD_CONTROL),
  5 : (52, win32con.MOD_CONTROL),
  6 : (53, win32con.MOD_CONTROL),
  7 : (54, win32con.MOD_CONTROL),
  8 : (55, win32con.MOD_CONTROL),
  9 : (56, win32con.MOD_CONTROL),
  10 : (57, win32con.MOD_CONTROL),
  11 : (107, win32con.MOD_CONTROL | win32con.MOD_SHIFT) #never calls
its #function, and note that it is not in the sequence of the other
ten
})

and here is a list of functions tied to it:

funcs.append({
  1 : exitProgram,
  2 : arm.sayLoad1,
  3 : arm.sayLoad2,
  4 : arm.sayLoad3,
  5 : arm.sayLoad4,
  6 : arm.sayProcAvg,
  7 : arm.sayUsedRam,
  8 : arm.sayDisk1Info,
  9 : arm.sayDisk2Info,
  10 : nextMode,
  11: clipboard.toClipboard
})

If I were to tie clipboard.toClipboard to any of keys 1-10 (0-9, or
48-57) then it would work fine; it is when the 107 shows up that the
function is not called, and this is a huge limitation for the rest of
the program since I am stuck with just the ten numbers available on
the keyboard. Any suggestions would be great!


On 3/9/10, Tim Golden <mail at timgolden.me.uk> wrote:
> On 09/03/2010 13:55, Alex Hall wrote:
>> Hi all,
>> In the same program I wrote about yesterday, I have a dictionary of
>> keystrokes which are captured. I just tried adding a new one, bringing
>> the total to 11. Here are entries 10 and 11; 10 has been working fine
>> for months.
>>
>>    10 : (57, win32con.MOD_CONTROL),
>>    11 : (99, win32con.MOD_CONTROL | win32con.MOD_SHIFT)
>>
>> Now, though, when I press ctrl-shift-c (keystroke 11)
>
> Ctrl-C (with or without any other modifier) has a special meaning
> which overrides any hotkeys. You may be able to do something by
> adding a break handler through SetConsoleCtrlHandler (exposed in
> win32api). But it would obviously be a special case outside your
> normal control flow.
>
> TJG
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From jjposner at optimum.net  Tue Mar  9 11:49:37 2010
From: jjposner at optimum.net (John Posner)
Date: Tue, 09 Mar 2010 11:49:37 -0500
Subject: imported var not being updated
In-Reply-To: <4b965fde$0$14410$426a74cc@news.free.fr>
References: <bc7f680c1003082022k4b1dd708i1d6e17cdf05db563@mail.gmail.com>
	<mailman.478.1268110509.23598.python-list@python.org>
	<4B9658C2.1040707@optimum.net>
	<4b965fde$0$14410$426a74cc@news.free.fr>
Message-ID: <4b967bfa$0$31260$607ed4bc@cv.net>

On 3/9/2010 9:48 AM, Bruno Desthuilliers wrote:
> John Posner a ?crit :
>> On 3/8/2010 11:55 PM, Gary Herron wrote:
>> <snip>
>>>
>>> The form of import you are using
>>> from helpers import mostRecent
>>> makes a *new* binding to the value in the module that's doing the
>>> import.
>>
>> <snip>
>>
>>> What you can do, is not make a separate binding, but reach into the
>>> helpers module to get the value there. Like this:
>>>
>>> import helpers
>>> print helpers.mostRecent
>>>
>>
>> Gary, are you asserting that in these separate situations:
>>
>> one.py:
>>
>> from helpers import mostRecent
>> x = mostRecent
>>
>> two.py:
>>
>> import helpers
>> x = helpers.mostRecent
>>
>>
>> ... the name "x" will be bound to different objects?
>
> Nope. What he's saying is that one.x and two.x are two different names -
> each living in it's own namespace - that happen to be bound to the same
> object. Now rebiding one.x to a different object will _of course_ have
> no impact on the object two.x is bound to.

Sure -- my bad, Python 101. In this case, the module *helpers* is the 
equivalent of a container object, one of whose attributes *mostRecent* 
gets bound to a series of immutable string objects.

>
> That's exactly the same as:
>
> one = dict()
> two = dict()
>
> # one['x'] and two['x'] refer to the same object
> one['x'] = two['x'] = ["foo", "bar"]
> print one['x'], two['x'], one['x'] is two['x']
>
> # mutating one['x'], visible in two['x']
> # (of course since it's the same object)
> one['x'].append("baaz")
> print one['x'], two['x'], one['x'] is two['x']
>
> # now rebind one['x']
> one['x'] = 42
>
> # obvious result: one['x'] and two['x'] now refer to 2 different objects
> print one['x'], two['x'], one['x'] is two['x']
>
>
> If in doubt about namespaces, think dicts. Namespaces are like dicts -
> and are often nothing else that a plain old dict FWIW.

No doubts here, I hope. I even tend to see namespaces where, strictly 
speaking, they don't exist. As I said at the end of a recent (and 
flame-ridden) thread [1]:

   -----------
   * A dict is a collection of user-devised names, each of which
     is assigned to an object.
   * A list/tuple is an interpreter-maintained collection of integer
     names (0, 1, 2, ...), each of which is assigned to an object.
   -----------

So in my world, in mylist[cnt+1], the expression *cnt+1* is equivalent 
to the integer "name" 4 (if cnt==3, that is), so that

    mylist[cnt+1] = obj.subobj.attr

... is just a NAME2 = NAME1 kind of assignment statement, binding an 
additional name to an object that already has a name.

Tx,
John

[1] http://mail.python.org/pipermail/python-list/2010-February/1236318.html







From cbmanica at gmail.com  Tue Mar  9 11:54:55 2010
From: cbmanica at gmail.com (C. Benson Manica)
Date: Tue, 9 Mar 2010 08:54:55 -0800 (PST)
Subject: String is ASCII or UTF-8?
Message-ID: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>

Hours of Googling has not helped me resolve a seemingly simple
question - Given a string s, how can I tell whether it's ascii (and
thus 1 byte per character) or UTF-8 (and two bytes per character)?
This is python 2.4.3, so I don't have getsizeof available to me.


From alfps at start.no  Tue Mar  9 12:02:29 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Tue, 09 Mar 2010 18:02:29 +0100
Subject: String is ASCII or UTF-8?
In-Reply-To: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>
Message-ID: <hn5uvd$4i7$1@news.eternal-september.org>

* C. Benson Manica:
> Hours of Googling has not helped me resolve a seemingly simple
> question - Given a string s, how can I tell whether it's ascii (and
> thus 1 byte per character) or UTF-8 (and two bytes per character)?
> This is python 2.4.3, so I don't have getsizeof available to me.

Generally, if you need 100% certainty then you can't tell the encoding from a 
sequence of byte values.

However, if you know that it's EITHER ascii or utf-8 then the presence of any 
value above 127 (or, for signed byte values, any negative values), tells you 
that it can't be ascii, hence, must be utf-8. And since utf-8 is an extension of 
ascii nothing is lost by assuming ascii in the other case. So, problem solved.

If the string represents the contents of a file then you may also look for an 
UTF-8 represention of the Unicode BOM (Byte Order Mark) at the beginning. If 
found then it indicates utf-8 for almost-sure and more expensive searching can 
be avoided. It's just three bytes to check.


Cheers & hth.,

- Alf


From mail at timgolden.me.uk  Tue Mar  9 12:07:44 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 09 Mar 2010 17:07:44 +0000
Subject: String is ASCII or UTF-8?
In-Reply-To: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>
Message-ID: <4B968060.7080606@timgolden.me.uk>

On 09/03/2010 16:54, C. Benson Manica wrote:
> Hours of Googling has not helped me resolve a seemingly simple
> question - Given a string s, how can I tell whether it's ascii (and
> thus 1 byte per character) or UTF-8 (and two bytes per character)?
> This is python 2.4.3, so I don't have getsizeof available to me.

You can't. You can apply one or more heuristics, depending on exactly
what your requirement is. But any valid ASCII text is also valid
UTF8-encoded text since UTF-8 isn't "two bytes per char" but a variable
number of bytes per char.

Obviously, you can test whether all the bytes are less than 128 which
suggests that the text is legal ASCII. But then it's also legal UTF8.
Or you can just attempt to decode and catch the exception:

try:
   unicode (text, "ascii")
except UnicodeDecodeError:
   print "Not ASCII"


TJG


From stef.mientki at gmail.com  Tue Mar  9 12:12:48 2010
From: stef.mientki at gmail.com (Stef Mientki)
Date: Tue, 09 Mar 2010 18:12:48 +0100
Subject: String is ASCII or UTF-8?
In-Reply-To: <hn5uvd$4i7$1@news.eternal-september.org>
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>
	<hn5uvd$4i7$1@news.eternal-september.org>
Message-ID: <4B968190.6010208@gmail.com>

On 09-03-2010 18:02, Alf P. Steinbach wrote:
> * C. Benson Manica:
>> Hours of Googling has not helped me resolve a seemingly simple
>> question - Given a string s, how can I tell whether it's ascii (and
>> thus 1 byte per character) or UTF-8 (and two bytes per character)?
>> This is python 2.4.3, so I don't have getsizeof available to me.
>
> Generally, if you need 100% certainty then you can't tell the encoding 
> from a sequence of byte values.
>
> However, if you know that it's EITHER ascii or utf-8 then the presence 
> of any value above 127 (or, for signed byte values, any negative 
> values), tells you that it can't be ascii, 
AFAIK it's completely impossible.
UTF-8 characters have 1 to 4 bytes / byte.
I can create ASCII strings containing byte values between 127 and 255.

cheers,
Stef

> hence, must be utf-8. And since utf-8 is an extension of ascii nothing 
> is lost by assuming ascii in the other case. So, problem solved.
>
> If the string represents the contents of a file then you may also look 
> for an UTF-8 represention of the Unicode BOM (Byte Order Mark) at the 
> beginning. If found then it indicates utf-8 for almost-sure and more 
> expensive searching can be avoided. It's just three bytes to check.
>
>
> Cheers & hth.,
>
> - Alf



From tjreedy at udel.edu  Tue Mar  9 12:13:33 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 09 Mar 2010 12:13:33 -0500
Subject: scipy sparse matrix question
In-Reply-To: <1jf28jr.7abra61nwu04pN%see@sig.for.address>
References: <1jf28jr.7abra61nwu04pN%see@sig.for.address>
Message-ID: <hn5vjo$s4r$1@dough.gmane.org>

On 3/9/2010 1:14 AM, Victor Eijkhout wrote:
> I can't find any detailed information about scipy.sparse.

Scipy questions are best asked on the scipy list, which I suspect you 
can also access via news.gmane.org.

>
> My specific question: what does "for x in A" give me when A is a sparse
> matrix?

Try it and see what you get.



From MLMDev at Comcast.net  Tue Mar  9 12:15:59 2010
From: MLMDev at Comcast.net (Mitchell L Model)
Date: Tue, 9 Mar 2010 12:15:59 -0500
Subject: sys.stdout vs. sys.stderr
In-Reply-To: <mailman.3358.1263237302.28904.python-list@python.org>
References: <mailman.3358.1263237302.28904.python-list@python.org>
Message-ID: <CFCDBB14-0DD0-478E-8F45-9B974597F88C@Comcast.net>


On Jan 11, 2010, at 1:47 PM Nobody <nobody at nowhere.com> wrote:

>
>> On Mon, 11 Jan 2010 10:09:36 +0100, Martin v. Loewis wrote:
>>
>>> In Python 3.1 is there any difference in the buffering behavior of  
>>> the
>>> initial sys.stdout and sys.stderr streams?
>>
>> No.
>>
>>> Were they different at some earlier point in Python's evolution?
>>
>> That depends on the operating system. These used to be whatever the
>> C library set up as stdout and stderr. Typically, they were buffered
>> in the same way.
>
> On Unix, stdout will be line buffered if it is associated with a tty
> and fully buffered otherwise, while stderr is always unbuffered.
>
> On Windows, stdout and stderr are unbuffered if they refer to a  
> character
> device, fully buffered otherwise (Windows doesn't have line buffering;
> setvbuf(_IOLBF) is equivalent to setvbuf(_IOFBF)).
>
> ANSI C says:
>
> As initially opened, the standard error stream is not fully  
> buffered; the
> standard input and standard output streams are fully buffered if and  
> only
> if the  stream can be determined not to refer to an interactive  
> device.
>

I don't want to get into a quibble fight here, but I need to reraise  
this issue.
[I teach and write and want to make sure I get this right. I already  
have an
incorrect paragraph about this in my Bioinformatics Programming Using  
Python
book.] The key question here is line buffering vs full buffering. In  
Unix (at least
in an OS X Terminal), the following code prints a number every two  
seconds
in Python 2:

	>>> for n in range(5):
	. . .  		print >> sys.stderr, n,     # final , to not send newline
	. . .		time.sleep(2)

However, in Python 3, similar code does not print the numbers until  
the whole
thing finishes (again, running from the terminal).

	>>> for n in range(5):
	. . .  		print(n, file=sys.stderr, end='')
	. . .		time.sleep(2)

So it appears that in a Unix terminal window, Python 2 does not line- 
buffer stderr
whereas Python 3 does. That's what tripped me up. While developing and  
debugging
code, I often print periods on a line as some loop progresses  
(sometimes every Nth
time around, for some reasonable N) just to know the pace of execution  
and that
the program is still doing something. In doing that recently in Python  
3 I discovered that
I either had to leave out the end='' or do sys.stderr.flush() after  
every print, which
amounts to the same thing.

This was a big surprise, after many, many years of C, C++,
Java, and Python programming -- I have always thought of stderr as  
completely
unbuffered in languages that have it. Doesn't mean some languages line- 
buffer
stderr on some platforms, just pointing out an assumption I've lived  
with for a very
long time that tripped me up writing a note about using stderr in  
Python 3 without
actually demonstrating the code and therefore not catching my error.
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From cbmanica at gmail.com  Tue Mar  9 12:17:58 2010
From: cbmanica at gmail.com (C. Benson Manica)
Date: Tue, 9 Mar 2010 09:17:58 -0800 (PST)
Subject: String is ASCII or UTF-8?
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>
	<mailman.500.1268154470.23598.python-list@python.org>
Message-ID: <98375575-1071-46af-8ebc-f3c817b47e1d@q23g2000yqd.googlegroups.com>

On Mar 9, 12:07?pm, Tim Golden <m... at timgolden.me.uk> wrote:

> You can't. You can apply one or more heuristics, depending on exactly
> what your requirement is. But any valid ASCII text is also valid
> UTF8-encoded text since UTF-8 isn't "two bytes per char" but a variable
> number of bytes per char.

Hm, well that's very unfortunate.  I'm using a database library which
seems to assume that all strings passed to it are ASCII, and I'm
attempting to use it on two different systems - one where all strings
are ASCII, and one where they seem to be UTF-8.  The strings come from
the same place, i.e. they're exclusively normal ASCII characters.
What I would want is to check once for whether the strings passed to
function foo() are ASCII or UTF-8, and if they are to assume that all
strings need to be decoded.  So that's not possible?


From R.Brodie at rl.ac.uk  Tue Mar  9 12:24:49 2010
From: R.Brodie at rl.ac.uk (Richard Brodie)
Date: Tue, 9 Mar 2010 17:24:49 -0000
Subject: String is ASCII or UTF-8?
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>
	<mailman.500.1268154470.23598.python-list@python.org>
	<98375575-1071-46af-8ebc-f3c817b47e1d@q23g2000yqd.googlegroups.com>
Message-ID: <hn6092$11n$1@south.jnrs.ja.net>


"C. Benson Manica" <cbmanica at gmail.com> wrote in message 
news:98375575-1071-46af-8ebc-f3c817b47e1d at q23g2000yqd.googlegroups.com...

>The strings come from the same place, i.e. they're exclusively
> normal ASCII characters.

In this case then converting them to/from UTF-8 is a no-op, so
it makes no difference at all. 




From cbmanica at gmail.com  Tue Mar  9 12:31:59 2010
From: cbmanica at gmail.com (C. Benson Manica)
Date: Tue, 9 Mar 2010 09:31:59 -0800 (PST)
Subject: String is ASCII or UTF-8?
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>
	<mailman.500.1268154470.23598.python-list@python.org>
	<98375575-1071-46af-8ebc-f3c817b47e1d@q23g2000yqd.googlegroups.com>
	<hn6092$11n$1@south.jnrs.ja.net>
Message-ID: <1c9b34ab-d949-4d2d-afbd-9a1c41462f0a@g4g2000yqa.googlegroups.com>

On Mar 9, 12:24?pm, "Richard Brodie" <R.Bro... at rl.ac.uk> wrote:
> "C. Benson Manica" <cbman... at gmail.com> wrote in messagenews:98375575-1071-46af-8ebc-f3c817b47e1d at q23g2000yqd.googlegroups.com...
>
> >The strings come from the same place, i.e. they're exclusively
> > normal ASCII characters.
>
> In this case then converting them to/from UTF-8 is a no-op, so
> it makes no difference at all.

Except to the database library, which seems perfectly happy to send an
8-character UTF-8 string to the database as 16 raw characters...


From robert.kern at gmail.com  Tue Mar  9 12:36:48 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 09 Mar 2010 11:36:48 -0600
Subject: String is ASCII or UTF-8?
In-Reply-To: <4B968190.6010208@gmail.com>
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>	<hn5uvd$4i7$1@news.eternal-september.org>
	<4B968190.6010208@gmail.com>
Message-ID: <hn60vg$5pi$1@dough.gmane.org>

On 2010-03-09 11:12 AM, Stef Mientki wrote:
> On 09-03-2010 18:02, Alf P. Steinbach wrote:
>> * C. Benson Manica:
>>> Hours of Googling has not helped me resolve a seemingly simple
>>> question - Given a string s, how can I tell whether it's ascii (and
>>> thus 1 byte per character) or UTF-8 (and two bytes per character)?
>>> This is python 2.4.3, so I don't have getsizeof available to me.
>>
>> Generally, if you need 100% certainty then you can't tell the encoding
>> from a sequence of byte values.
>>
>> However, if you know that it's EITHER ascii or utf-8 then the presence
>> of any value above 127 (or, for signed byte values, any negative
>> values), tells you that it can't be ascii,
> AFAIK it's completely impossible.
> UTF-8 characters have 1 to 4 bytes / byte.
> I can create ASCII strings containing byte values between 127 and 255.

No, you can't. ASCII strings only have characters in the range 0..127. You could 
create Latin-1 (or any number of the 8-bit encodings out there) strings with 
characters 0..255, yes, but not ASCII.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From askedrelic at gmail.com  Tue Mar  9 12:37:12 2010
From: askedrelic at gmail.com (Matthew Behrens)
Date: Tue, 9 Mar 2010 12:37:12 -0500
Subject: Are there in Python some static web site generating tools like 
	webgen, nanoc or webby in Ruby ?
In-Reply-To: <hn50ud$27u$1@dough.gmane.org>
References: <hn50ud$27u$1@dough.gmane.org>
Message-ID: <75d625cc1003090937t24c2dbe7u9a61e5a9a2107d19@mail.gmail.com>

> I like this tools, I'm wonder if there are similar tools in Python ?

Blogofile is a static file blog engine/compiler, inspired by Jekyll.

http://blogofile.com/
http://github.com/EnigmaCurry/blogofile


From tjreedy at udel.edu  Tue Mar  9 12:59:16 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 09 Mar 2010 12:59:16 -0500
Subject: String is ASCII or UTF-8?
In-Reply-To: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>
Message-ID: <hn629g$bsb$1@dough.gmane.org>

On 3/9/2010 11:54 AM, C. Benson Manica wrote:
> Hours of Googling has not helped me resolve a seemingly simple
> question - Given a string s, how can I tell whether it's ascii (and
> thus 1 byte per character) or UTF-8 (and two bytes per character)?

Utf-8 is an encoding that uses 1 to 4 bytes per character.
So it is not clear what you are asking. Alf answered one of the possible 
questions.

> This is python 2.4.3, so I don't have getsizeof available to me.




From rschroev_nospam_ml at fastmail.fm  Tue Mar  9 13:13:07 2010
From: rschroev_nospam_ml at fastmail.fm (Roel Schroeven)
Date: Tue, 09 Mar 2010 19:13:07 +0100
Subject: String is ASCII or UTF-8?
In-Reply-To: <1c9b34ab-d949-4d2d-afbd-9a1c41462f0a@g4g2000yqa.googlegroups.com>
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>
	<mailman.500.1268154470.23598.python-list@python.org>
	<98375575-1071-46af-8ebc-f3c817b47e1d@q23g2000yqd.googlegroups.com>
	<hn6092$11n$1@south.jnrs.ja.net>
	<1c9b34ab-d949-4d2d-afbd-9a1c41462f0a@g4g2000yqa.googlegroups.com>
Message-ID: <Tcwln.240526$X_6.30742@newsfe22.ams2>

Op 2010-03-09 18:31, C. Benson Manica schreef:
> On Mar 9, 12:24 pm, "Richard Brodie" <R.Bro... at rl.ac.uk> wrote:
>> "C. Benson Manica" <cbman... at gmail.com> wrote in messagenews:98375575-1071-46af-8ebc-f3c817b47e1d at q23g2000yqd.googlegroups.com...
>>
>>> The strings come from the same place, i.e. they're exclusively
>>> normal ASCII characters.
>>
>> In this case then converting them to/from UTF-8 is a no-op, so
>> it makes no difference at all.
> 
> Except to the database library, which seems perfectly happy to send an
> 8-character UTF-8 string to the database as 16 raw characters...

In that case I think you mean UTF-16 or UCS-2 instead of UTF-8. UTF-16
uses 2 or more bytes per character, UCS-2 always uses 2 bytes per
character. UTF-8 uses 1 or more bytes per character.

If your texts are in a Western language, the second byte will be zero in
most characters; you could check for that (but note that the second byte
might be the first one in the byte stream, depending on the byte ordering).

HTH,
Roel

-- 
The saddest aspect of life right now is that science gathers knowledge
faster than society gathers wisdom.
  -- Isaac Asimov

Roel Schroeven


From pruebauno at latinmail.com  Tue Mar  9 13:24:27 2010
From: pruebauno at latinmail.com (nn)
Date: Tue, 9 Mar 2010 10:24:27 -0800 (PST)
Subject: related lists mean value (golfed)
References: <mailman.470.1268087649.23598.python-list@python.org> 
	<hn5801$sps$1@news.urz.uni-heidelberg.de>
	<hn5ad7$t8a$1@news.urz.uni-heidelberg.de> 
	<hn5dbo$ih6$02$1@news.t-online.com>
	<hn5npf$2kg$1@news.urz.uni-heidelberg.de> 
	<hn5rt6$6m1$03$1@news.t-online.com>
Message-ID: <62af4b09-77f6-47ab-bce0-2cfcbafecfed@c16g2000yqd.googlegroups.com>



Peter Otten wrote:
> Michael Rudolf wrote:
>
> > Am 09.03.2010 13:02, schrieb Peter Otten:
> >>>>> [sum(a for a,b in zip(x,y) if b==c)/y.count(c)for c in y]
> >> [1.5, 1.5, 8.0, 4.0, 4.0, 4.0]
> >> Peter
> >
> > ... pwned.
> > Should be the fastest and shortest way to do it.
>
> It may be short, but it is not particularly efficient. A dict-based approach
> is probably the fastest. If y is guaranteed to be sorted itertools.groupby()
> may also be worth a try.
>
> $ cat tmp_average_compare.py
> from __future__ import division
> from collections import defaultdict
> try:
>     from itertools import izip as zip
> except ImportError:
>     pass
>
> x = [1 ,2, 8, 5, 0, 7]
> y = ['a', 'a', 'b', 'c', 'c', 'c' ]
>
> def f(x=x, y=y):
>     p = defaultdict(int)
>     q = defaultdict(int)
>     for a, b in zip(x, y):
>         p[b] += a
>         q[b] += 1
>     return [p[b]/q[b] for b in y]
>
> def g(x=x, y=y):
>     return [sum(a for a,b in zip(x,y)if b==c)/y.count(c)for c in y]
>
> if __name__ == "__main__":
>     print(f())
>     print(g())
>     assert f() == g()
> $ python3 -m timeit -s 'from tmp_average_compare import f, g' 'f()'
> 100000 loops, best of 3: 11.4 usec per loop
> $ python3 -m timeit -s 'from tmp_average_compare import f, g' 'g()'
> 10000 loops, best of 3: 22.8 usec per loop
>
> Peter


I converged to the same solution but had an extra reduction step in
case there were a lot of repeats in the input. I think it is a good
compromise between efficiency, readability and succinctness.

x = [1 ,2, 8, 5, 0, 7]
y = ['a', 'a', 'b', 'c', 'c', 'c' ]
from collections import defaultdict
totdct = defaultdict(int)
cntdct = defaultdict(int)
for name, num in zip(y,x):
   totdct[name] += num
   cntdct[name] += 1
avgdct = {name : totdct[name]/cnts for name, cnts in cntdct.items()}
w = [avgdct[name] for name in y]



From stefan_ml at behnel.de  Tue Mar  9 14:19:44 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 09 Mar 2010 20:19:44 +0100
Subject: Are there in Python some static web site generating tools like
	webgen, nanoc or webby in Ruby ?
In-Reply-To: <hn50ud$27u$1@dough.gmane.org>
References: <hn50ud$27u$1@dough.gmane.org>
Message-ID: <hn670h$nt$1@dough.gmane.org>

KLEIN St?phane, 09.03.2010 09:30:
> Today, I've show this static web site generating tools writed in ruby :
>
>   * http://webgen.rubyforge.org/index.html
>   * http://nanoc.stoneship.org/about/
>   * http://webby.rubyforge.org/tutorial/
>
> I like this tools, I'm wonder if there are similar tools in Python ?

Here's a still incomplete but not so short list of web frameworks in Python:

http://wiki.python.org/moin/WebFrameworks

You might be interested in the templating frameworks if all you want is 
generate static pages.

Stefan



From tavares at fe.up.pt  Tue Mar  9 14:25:57 2010
From: tavares at fe.up.pt (tavares at fe.up.pt)
Date: Tue, 9 Mar 2010 11:25:57 -0800 (PST)
Subject: ICNAAM 2010 Mini-Symposium on Computational Bioimaging and 
	Visualization
Message-ID: <be6a5505-df04-44f4-b139-8435379d0597@j27g2000yqn.googlegroups.com>

Dear Colleague,

Within the ICNAAM 2010 - 8th International Conference of Numerical
Analysis and Applied Mathematics (http://www.icnaam.org), to be held
in Rhodes, Greece, on 19-25 September 2010, we are organizing the Mini-
Symposium on ?Computational Bioimaging and Visualization?.
Due to your research activities in the related fields, we would like
to invite you to submit an invited extended abstract to our mini-
symposium. Your contribution is mostly welcomed, and we would be
honoured if you could accept this invitation.


TOPICS OF INTEREST (not restricted to):

- Image Processing and Analysis for Computational Bioimaging and
Visualization;
- Biomedical Signal and Image Acquisition and Processing;
- Data Processing, Modeling and Analysis;
- Scientific Visualization;
- Enhanced Visualization;
- Human Computer Interaction;
- Simulation and Animation;
- Virtual Reality;
- Computer Aided Diagnosis, Surgery, Therapy, Treatment and
Telemedicine Systems;
- Software Development for Computational Bioimaging and Visualization;
- Grid Computing in Computational Bioimaging and Visualization;
- Applications of Computational Bioimaging and Visualization.


IMPORTANT DATES:

Deadline for Submission of Extended Abstract: July 22, 2010;
Notification of acceptance: July 29, 2010;
Deadline for Submission of the source files of the camera ready
extended abstracts to American Institute of Physics (AIP Conference
Proceedings): August 1, 2010.

SUBMISSION INSTRUCTIONS:

Extended abstracts will be published in a Special Volume of the AIP
Conference Proceedings.
Please, see the Instructions for Authors at: http://www.icnaam.org/abstract.htm,
and select the Mini-Symposium on ?Computational Bioimaging and
Visualization? when submitting your contribution.


With kind regards,

Jo?o Manuel R. S. Tavares, University of Porto, Portugal,
tavares at fe.up.pt
Renato Natal Jorge, University of Porto, Portugal, rnatal at fe.up.pt
(Organizers of the Mini-Symposium on ?Computational Bioimaging and
Visualization?)


From tarekamr at gmail.com  Tue Mar  9 15:31:15 2010
From: tarekamr at gmail.com (tarekamr at gmail.com)
Date: Tue, 9 Mar 2010 12:31:15 -0800 (PST)
Subject: Pyrhon2.5 to 2.4 conversion
References: <739740b0-802d-4f1b-8c09-c9094242ffad@g10g2000yqh.googlegroups.com>
	<mailman.4.1267323133.23598.python-list@python.org>
Message-ID: <8676dc2a-2246-4fcb-8736-e6effeddbcad@b7g2000yqd.googlegroups.com>

Thanks a lot everybody for your help, it worked now :)

On Feb 28, 4:12?am, MRAB <pyt... at mrabarnett.plus.com> wrote:
> tarek... at gmail.com wrote:
> > Hi,
>
> > I am currently using oauth2.py library, and it works fine on one of my
> > PC's (python2.5), but later on when I tried to use it with python2.4
> > the following line (line 332 inhttp://github.com/simplegeo/python-oauth2/blob/master/oauth2/__init__.py)
> > showed a syntax error
>
> > items = [(k, v if type(v) != ListType else sorted(v)) for k,v in
> > sorted(self.items()) if k != 'oauth_signature']
>
> > So it there a way to convert this line to a python2.4 compliant
> > syntax.
>
> I think the clearest is:
>
> items = []
> for k, v in sorted(self.items()):
> ? ? ?if k != 'oauth_signature':
> ? ? ? ? ?if type(v) == ListType:
> ? ? ? ? ? ? ?v = sorted(v)
> ? ? ? ? ?items.append((k, v))



From martin at v.loewis.de  Tue Mar  9 15:44:54 2010
From: martin at v.loewis.de (Martin v. Loewis)
Date: Tue, 09 Mar 2010 21:44:54 +0100
Subject: String is ASCII or UTF-8?
In-Reply-To: <mailman.501.1268154771.23598.python-list@python.org>
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>	<hn5uvd$4i7$1@news.eternal-september.org>
	<mailman.501.1268154771.23598.python-list@python.org>
Message-ID: <4B96B346.2050700@v.loewis.de>

> I can create ASCII strings containing byte values between 127 and 255.

No, you can't - or what you create wouldn't be an ASCII string, by
definition of ASCII.

Regards,
Martin


From see at sig.for.address  Tue Mar  9 15:52:03 2010
From: see at sig.for.address (Victor Eijkhout)
Date: Tue, 9 Mar 2010 14:52:03 -0600
Subject: scipy sparse matrix question
References: <1jf28jr.7abra61nwu04pN%see@sig.for.address>
	<mailman.511.1268155244.23598.python-list@python.org>
Message-ID: <1jf3d8v.crydq1be5um2N%see@sig.for.address>

Terry Reedy <tjreedy at udel.edu> wrote:

> > My specific question: what does "for x in A" give me when A is a sparse
> > matrix?
> 
> Try it and see what you get.

Ah, how do I see what I get? If I print it it looks plausible, but I
don't know how to pull it apart. It doesn't seem to be an array.

Victor.

-- 
Victor Eijkhout -- eijkhout at tacc utexas edu


From gagsl-py2 at yahoo.com.ar  Tue Mar  9 15:56:24 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 09 Mar 2010 17:56:24 -0300
Subject: How to detect C Function block using python
References: <769249.71022.qm@web62401.mail.re1.yahoo.com>
Message-ID: <op.u9bi4a0vx6zn5v@lepton.softlabbsas.com.ar>

En Tue, 09 Mar 2010 04:51:57 -0300, Faheem <faheem_imt at yahoo.com> escribi?:

> I'm new in this community. I am writing a static analyzer for validating  
> C Code using python and for that I'm looking for a python module/API  
> that will detect Function block of a given C-File. I know simple  
> function can be detected using push "{" and poping it if character "}"  
> is found. This solution is actually done already, I want a robust API  
> that can do more then that like detecting Function name parameters its  
> return types etc.

Take a look at ctypeslib [1]; it uses gccxml [2] to parse .h header files  
and generate equivalent Python declarations.

[1] http://svn.python.org/view/ctypes/trunk/ctypeslib/
[2] http://www.gccxml.org/

-- 
Gabriel Genellina



From robert.kern at gmail.com  Tue Mar  9 16:13:23 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 09 Mar 2010 15:13:23 -0600
Subject: scipy sparse matrix question
In-Reply-To: <1jf3d8v.crydq1be5um2N%see@sig.for.address>
References: <1jf28jr.7abra61nwu04pN%see@sig.for.address>	<mailman.511.1268155244.23598.python-list@python.org>
	<1jf3d8v.crydq1be5um2N%see@sig.for.address>
Message-ID: <hn6dlk$rnk$1@dough.gmane.org>

On 2010-03-09 14:52 PM, Victor Eijkhout wrote:
> Terry Reedy<tjreedy at udel.edu>  wrote:
>
>>> My specific question: what does "for x in A" give me when A is a sparse
>>> matrix?
>>
>> Try it and see what you get.
>
> Ah, how do I see what I get? If I print it it looks plausible, but I
> don't know how to pull it apart. It doesn't seem to be an array.

In [5]: I = sparse.csr_matrix(np.eye(4))

In [6]: list(I)
Out[6]:
[<1x4 sparse matrix of type '<type 'numpy.float64'>'
         with 1 stored elements in Compressed Sparse Row format>,
  <1x4 sparse matrix of type '<type 'numpy.float64'>'
         with 1 stored elements in Compressed Sparse Row format>,
  <1x4 sparse matrix of type '<type 'numpy.float64'>'
         with 1 stored elements in Compressed Sparse Row format>,
  <1x4 sparse matrix of type '<type 'numpy.float64'>'
         with 1 stored elements in Compressed Sparse Row format>]

What is unclear about that? They are obviously 1x4 sparse matrices, i.e. the 
rows of the matrix. Use the .indices and .data attributes to get the indices of 
the nonzero values and the corresponding values.

Details may differ depending on the format of sparse matrix. Some aren't even 
iterable.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From anfedorov at gmail.com  Tue Mar  9 16:26:52 2010
From: anfedorov at gmail.com (Andrey Fedorov)
Date: Tue, 9 Mar 2010 16:26:52 -0500
Subject: Down casting Python objects
Message-ID: <7659cab31003091326i6f3ab6bta3b8f5948ab7b0ff@mail.gmail.com>

So I have `x', a instance of class `Foo'. I also have class `Bar', a class
extending `Foo' with a couple of methods. I'd like to "down cast" x as
efficiently as possible. Is it OK to just set `x.__class__ = Bar' and expect
things to work OK in all major versions of CPython?
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From art at hens-teeth.net  Tue Mar  9 16:28:54 2010
From: art at hens-teeth.net (Art Zemon)
Date: Tue, 09 Mar 2010 15:28:54 -0600
Subject: CSV DictReader loops when used with MySQLdb
Message-ID: <4B96BD96.5010605@hens-teeth.net>

I'm going crazy.

Using python 2.5.2 on 64 bit Linux.

I have a class which reads CSV files using the CSV DictReader. If I
print the rows, everything works perfectly. If I insert the rows into a
MySQL table using MySQLdb, the DictReader loops back and begins
re-reading from the beginning of the file when it reaches EOF.

Here's the code:

class CsvLoader:
    """load data from a CSV file into a corresponding MySQL table"""

    def __init__(self, fname, schema, db, useCleanReader = False):
        self.schema = schema
        self.db = db
        if useCleanReader:
            self.reader = csv.DictReader(CleanReader(fname),
delimiter=',', quotechar='"')
        else:
            self.reader = csv.DictReader(open(fname), delimiter=',',
quotechar='"')
   
    def loadMysql(self):
        for row in self.reader:
            self.db.insertGeneric(self.schema.tableName(), row)

    def printRows(self):
        for row in self.reader:
            print "\n", row

and here is the insertGeneric method:

    def insertGeneric(self, table, record):
        """execute a generic INSERT, given a dict as input"""
        fieldList = []
        valueList = []
        for k in record.keys():
            fieldList.append(k)
            valueList.append(record[k])
        fields = ", ".join(fieldList)
        m = ['%s']
        valueMarkers = ", ".join(m * len(valueList))  # create a string
like: %s, %s, %s...
        sql = 'insert into %s (%s) values (%s)' % (table, fields,
valueMarkers)
        cursor = self.conn.cursor()
        print "+++ insert: %s <= %s" % (sql, valueList)
        cursor.execute(sql, valueList)
        cursor.close()

useCleanReader is False
CsvLoader.printRows() works fine.
CsvLoader.loadMySql() keeps looping through the CSV file.

Ideas?

    -- Art Z.

-- 

Art Zemon, President
Hen's Teeth Network <http://www.hens-teeth.net/>
Phone: (866)HENS-NET or (636)447-3030 ext. 200
Twitter: AZemon <http://twitter.com/AZemon>

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From stef.mientki at gmail.com  Tue Mar  9 16:36:08 2010
From: stef.mientki at gmail.com (Stef Mientki)
Date: Tue, 09 Mar 2010 22:36:08 +0100
Subject: String is ASCII or UTF-8?
In-Reply-To: <hn60vg$5pi$1@dough.gmane.org>
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>	<hn5uvd$4i7$1@news.eternal-september.org>	<4B968190.6010208@gmail.com>
	<hn60vg$5pi$1@dough.gmane.org>
Message-ID: <4B96BF48.7080201@gmail.com>

On 09-03-2010 18:36, Robert Kern wrote:
> On 2010-03-09 11:12 AM, Stef Mientki wrote:
>> On 09-03-2010 18:02, Alf P. Steinbach wrote:
>>> * C. Benson Manica:
>>>> Hours of Googling has not helped me resolve a seemingly simple
>>>> question - Given a string s, how can I tell whether it's ascii (and
>>>> thus 1 byte per character) or UTF-8 (and two bytes per character)?
>>>> This is python 2.4.3, so I don't have getsizeof available to me.
>>>
>>> Generally, if you need 100% certainty then you can't tell the encoding
>>> from a sequence of byte values.
>>>
>>> However, if you know that it's EITHER ascii or utf-8 then the presence
>>> of any value above 127 (or, for signed byte values, any negative
>>> values), tells you that it can't be ascii,
>> AFAIK it's completely impossible.
>> UTF-8 characters have 1 to 4 bytes / byte.
>> I can create ASCII strings containing byte values between 127 and 255.
>
> No, you can't. ASCII strings only have characters in the range 0..127. 
> You could create Latin-1 (or any number of the 8-bit encodings out 
> there) strings with characters 0..255, yes, but not ASCII.
>
Probably, and according to wikipedia you're right.
I think I've to get rid of my old books,
Borland turbo Pascal 4 (1987) has an ASCII table of 256 characters,
while the small letters say 7-bit  ;-)

cheers,
Stef
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From bringa at gmail.com  Tue Mar  9 16:41:10 2010
From: bringa at gmail.com (Daniel Klein)
Date: Tue, 9 Mar 2010 13:41:10 -0800 (PST)
Subject: Named loops for breaking
Message-ID: <6d6a35e8-f09c-4792-8abe-5a0dc24d214e@g28g2000yqh.googlegroups.com>

Hey,

I did a little searching and couldn't really find much recent on this.
The only thing I found was this:

http://groups.google.com/group/comp.lang.python/browse_thread/thread/a696624c92b91181/5b7479fdc3362b83?lnk=gst&q=break+named+loop#5b7479fdc3362b83

Basically I'm wondering if there are any plans to implemented named
loops in Python, so I can tell a break command to break out of a
specific loop in the case of nested loops. Currently I'm using boolean
flag variables, but I find that very clumsy. I know this idea of
breaking out of specific loops from javascript; I guess java does it
too. It just seems a very Pythonian idea to me: clear, promotes code
legibility, seems obvious.


From shengcer at gmail.com  Tue Mar  9 16:48:42 2010
From: shengcer at gmail.com (Shane)
Date: Tue, 9 Mar 2010 13:48:42 -0800 (PST)
Subject: How to dynamic insert more conditional statements into a function
Message-ID: <93ea751a-9d23-4186-897c-c2b079cc5c6c@e1g2000yqh.googlegroups.com>

Hi I am a newbie for Python

Here is a question, say I have a list L,

function foo is:

def foo(L):
    if L[0] > 0: return True

if later I want another function goo which returns "True" when L[0]
and L[1] are both > 0, i.e.,

def goo(L):
    if L[0] > 0 and L[1] > 0: return True

Can anybody tell me how can I write the function "goo" based upon the
function "foo"? Thanks!
I know if it is implementable, I should use "decorator". But I just
cannot figure out how.


From no.email at nospam.invalid  Tue Mar  9 16:58:01 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Tue, 09 Mar 2010 13:58:01 -0800
Subject: Named loops for breaking
References: <6d6a35e8-f09c-4792-8abe-5a0dc24d214e@g28g2000yqh.googlegroups.com>
Message-ID: <7xocixximu.fsf@ruckus.brouhaha.com>

Daniel Klein <bringa at gmail.com> writes:
> Basically I'm wondering if there are any plans to implemented named
> loops in Python, so I can tell a break command to break out of a
> specific loop in the case of nested loops. Currently I'm using boolean
> flag variables, but I find that very clumsy.

The usual way to do this in Python is with an exception, perhaps a
specially named one if that makes your code clearer:

  class Whatever(Exception): pass
  ... 
  try:
    for x in thingie:
      for y in x.whatsis():
        if lose(y): raise Whatever
        ...
  except Whatever: pass

This situation doesn't come up all that often and you should
probably ask yourself if you really need those nested loops.

You might also be able to put the nested loop structure into a
function that you can then exit with a return statement.


From ccurvey at gmail.com  Tue Mar  9 17:05:15 2010
From: ccurvey at gmail.com (Chris Curvey)
Date: Tue, 9 Mar 2010 14:05:15 -0800 (PST)
Subject: find text location (in pixels) using python (pyPdf)
Message-ID: <fc521bf2-46dd-445d-b292-12d2adef1bec@f8g2000yqn.googlegroups.com>

Has anyone ever tried to find the pixel (or point) location of text in
a PDF using Python?  I've been using the pyPdf libraries for other
things, and it seems to me that if I can find the bounding box for
text, I should be able to calculate the location.

What I want to do is take a PDF of one of our vendor invoices and blur
everything in it except the block that's related to a single
customer.  So if I have an invoice that looks like:

Alfred Annoying
123 Elm St
Somewhere, NJ
$100

Barbie Bonehead
456 Pine St
Elsewhere, NJ
$125

Charlie Clueless
789 Beech St.
Everywhere, NJ
$150

I want to show Barbie just her section of the invoice (with the header
intact, so that she can tell it's a real invoice) but with Alfred and
Charlie's information blurred out.  I was going to convert the PDF to
a JPG or PNG and do the blurring with ImageMagick/PythonMagick.  But
that requires me to know the pixel location of the regions that I want
blurred and left alone.

I'm also open to other ideas if I'm going about this the hard way....


From donal.k.fellows at man.ac.uk  Tue Mar  9 17:06:39 2010
From: donal.k.fellows at man.ac.uk (Donal K. Fellows)
Date: Tue, 9 Mar 2010 14:06:39 -0800 (PST)
Subject: Updates about Tk
References: <4b88d215$0$1105$4fafbaef@reader4.news.tin.it> 
	<6adc$4b895233$4275d90a$6509@FUSE.NET>
	<d6f9d8e2-3379-4add-bffd-0f058ccd6fd8@19g2000yqu.googlegroups.com>
Message-ID: <6aa37d52-13a0-4c1b-9304-d301ed8f8c63@q23g2000yqd.googlegroups.com>

On Feb 27, 5:29?pm, rantingrick <rantingr... at gmail.com> wrote:
> Great post Kevin! The only thing i would like to add are my two
> favorite references for learning Tkinter. They are not geared around
> the new ttk stuff, but still 95% relevant to any Tkinter-ing
>
> http://effbot.org/tkinterbook/
> http://infohost.nmt.edu/tcc/help/pubs/tkinter/

You might also want to check out:

  http://www.tkdocs.com/

Which covers the ttk widgets too (and, for multi-language people, it
also handles how to do it from four languages).

Donal.


From emile at fenx.com  Tue Mar  9 17:15:18 2010
From: emile at fenx.com (Emile van Sebille)
Date: Tue, 09 Mar 2010 14:15:18 -0800
Subject: String is ASCII or UTF-8?
In-Reply-To: <4B96BF48.7080201@gmail.com>
References: <25591dae-3b98-4039-b022-ad549785dd65@g4g2000yqa.googlegroups.com>	<hn5uvd$4i7$1@news.eternal-september.org>	<4B968190.6010208@gmail.com>	<hn60vg$5pi$1@dough.gmane.org>
	<4B96BF48.7080201@gmail.com>
Message-ID: <hn6h8q$au8$1@dough.gmane.org>

On 3/9/2010 1:36 PM Stef Mientki said...
> On 09-03-2010 18:36, Robert Kern wrote:

<snip>

>> No, you can't. ASCII strings only have characters in the range 0..127.
>> You could create Latin-1 (or any number of the 8-bit encodings out
>> there) strings with characters 0..255, yes, but not ASCII.
>>
> Probably, and according to wikipedia you're right.

I too looked at wikipedia, and it seems historically incomplete to me. 
In particular, I looked for 'high order ascii', which, when I was 
working with Basic Four in the '70's, is what they used.  Essentially, 
the high order bit was set for all characters to make 8A a line feed, 
etc.  Still the same 0..127 characters, but not really an extended ascii 
which is where wikipedia forwards you to.

I remember having to strap the eighth bit high when I reused the older 
line printers to get them to work.

Emile




From emile at fenx.com  Tue Mar  9 17:21:37 2010
From: emile at fenx.com (Emile van Sebille)
Date: Tue, 09 Mar 2010 14:21:37 -0800
Subject: How to dynamic insert more conditional statements into a function
In-Reply-To: <93ea751a-9d23-4186-897c-c2b079cc5c6c@e1g2000yqh.googlegroups.com>
References: <93ea751a-9d23-4186-897c-c2b079cc5c6c@e1g2000yqh.googlegroups.com>
Message-ID: <hn6hkl$c82$1@dough.gmane.org>

On 3/9/2010 1:48 PM Shane said...
> Hi I am a newbie for Python
>
> Here is a question, say I have a list L,
>
> function foo is:
>
> def foo(L):
>      if L[0]>  0: return True
>
> if later I want another function goo which returns "True" when L[0]
> and L[1] are both>  0, i.e.,
>
> def goo(L):
>      if L[0]>  0 and L[1]>  0: return True


Here's one way...

def foo(L,deep=0):
     return L[0] and not deep or foo(L[1:],deep-1)

Subject to clean up.

Emile



From gramos at yahoo.com  Tue Mar  9 17:53:50 2010
From: gramos at yahoo.com (brown wrap)
Date: Tue, 9 Mar 2010 14:53:50 -0800 (PST)
Subject: Can't build hashlib 
In-Reply-To: <fc521bf2-46dd-445d-b292-12d2adef1bec@f8g2000yqn.googlegroups.com>
Message-ID: <865538.86264.qm@web111703.mail.gq1.yahoo.com>




The md5 module is used in build xulrunner and Firefox from source. When I do run the install its says md5 no such module. I compiled Python 2.6.4 after installing openssl and BerkleyDB, yet I get this error when compilying Python:

Failed to find the necessary bits to build these modules:
_tkinter           bsddb185           dl              
imageop            sunaudiodev                        
To find the necessary bits, look in setup.py in detect_modules() for the module's name.


Failed to build these modules:
_hashlib           _ssl                               




      


From sluggoster at gmail.com  Tue Mar  9 18:18:11 2010
From: sluggoster at gmail.com (Mike Orr)
Date: Tue, 9 Mar 2010 15:18:11 -0800 (PST)
Subject: equivalent of Ruby's Pathname?
References: <843d5af9-e8db-4352-a853-4c99664eadf8@k6g2000prg.googlegroups.com>
	<dcace5fc-5ae9-4756-942d-6da7da2f660d@s36g2000prh.googlegroups.com> 
	<hkq3lv$7k2$1@panix5.panix.com>
	<8fc356e0-f3ed-4a67-9b37-f21561cef4a5@p13g2000pre.googlegroups.com>
	<hl9n2c$9r6$1@panix5.panix.com>
Message-ID: <73dcf2e2-a391-4c7a-9ded-b1ab156ad59f@u19g2000prh.googlegroups.com>

I just saw this thread on the Python-URL.

On Feb 14, 12:39?pm, a... at pythoncraft.com (Aahz) wrote:
> >> Sean DiZazzo =A0<half.ital... at gmail.com> wrote:
>
> >>>Why did Path() get rejected? Is it the idea itself, or just the
> >>>approach that was used? What are the complaints?
>
> >> You should search for the discussiona around it.
>
> >I read the discussion, and there was definitely some going back and
> >forth on whether it should be sub-classed from string, but the
> >conversation just seemed to stop abruptly with no decision one way of
> >the other. ?Maybe I missed a thread.

It has a habit of being discussed and dropped repeatedly. The main
issue is that Guido doesn't see an OO approach as necessarily better
than the existing functions, so it has a high bar for acceptance. One
issue is that some people see a need to separate filesystem-
independent functionality (joining paths and extracting components)
from filesystem-dependent functionality (listing directories, removing
files, etc). ``path.py`` and PEP 355 were rejected mainly because of
this. There was support for a small filesystem-independent class that
could be put into the stdlib, and some modest moving/renaming of the
filesystem functions (which are scattered across os, os.path, shutil,
glob, etc). We were hoping to get this done for Python 3 but didn't
make it. I wrote a ``Unipath`` package that tried to be a compromise
between what everybody wanted, with a FS-independent class and a FS-
dependent subclass, but could not get any feedback on it. Somebody
else was going to write a PEP for the renamings, but I never saw it.

Since then, path.py has been included in a couple packages and seems
to have the most widespread use. I gave up on the stdlib and
reconfigured Unipath as a pure 3rd-party library. (The FS-independent
AbstractPath class is still there if anybody wants to use it for a
PEP.) The other people who made their own implementations seemed to be
happy with theirs, and that was that.

The string vs non-string argument has pretty much been decided in
favor of strings (i.e., a string subclass). Not ``"a.txt".open()`` but
``open(Path("a.txt"))``.  Too many standard and 3rd-party modules
expect string paths: you'd have to convert your path to a string every
time you pass it as an argument.  The main problem with string paths
is that .join() means something else, but that's usually solved by
using a different method name: "joinpath", "child", "/", etc.

Other proposals have been a tuple subclass, so that ``Path("a/b/c.txt")
[-1] == Path("c.txt")``, and a library that can do non-native paths
(Windows style on Unix systems and vice-versa). These don't seem to be
in vogue anymore.

What has become more common is virtual paths; i.e., the same interface
for filesystems, FTP, zip files, etc. That was discussed during the
last go-around but there were no implementations. Now there are a few
projects active on this, such as http://groups.google.com/group/stdpyfs
. This is probably the future of any path object, so it would make
sense to define a path now that can work with all these backends.

--Mike


From jcb at iteris.com  Tue Mar  9 18:56:47 2010
From: jcb at iteris.com (Metalone)
Date: Tue, 9 Mar 2010 15:56:47 -0800 (PST)
Subject: file seek is slow
Message-ID: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>

I ran a comparison that timed 1e6 file seeks.
The tests were run with Python 2.6.4 and Microsoft Visual C 6.0 on
Windows XP with an Intel 3GHz single processor with hyperthreading.

Results:
C        : 0.812 seconds
Python: 1.458 seconds.
difference = 0.646 seconds.

If the file.seek is removed the Python loop takes 2ms so the loop
overhead is minimal.
Without pysco the loop overhead is 4.6ms and Python takes 1.866.

Any ideas what is causing the slow down over the 'C' version.

In general I have been trying to take a video application written in C+
+ and make it work in Python.
There seem to be delays in the handoff to Windows System code that
make the Python version just a touch slower in some areas, but these
slowdowns are critically effecting the work.  File seek is not a deal
breaker here, it is just the latest thing I have noticed and the
simplest to demonstrate.


Python version:
import time
def main():
    # write temp file
    SIZE = 1000
    f1 = file('video.txt', 'wb')
    f1.write('+' * SIZE)
    f1.close()

    f1 = file('video.txt', 'rb')
    t0 = time.clock()
    for i in xrange(1000000):
       f1.seek(0)
    delta = time.clock() - t0
    print "%.3f" % delta
    f1.close()

if __name__ == '__main__':
    import psyco
    psyco.full()
    main()

// 'C' version
#include <stdio.h>
#include <time.h>
#define SIZE 1000

static void main(int argc, char *argv[])
{
    FILE *f1;
    int i;
    int t0;
    float delta;
    char buffer[SIZE];

    // write temp file
    memset(buffer, (int)'+', SIZE);
    f1 = fopen("video.txt", "wb");
    fwrite(buffer, SIZE, 1, f1);
    fclose(f1);

    f1 = fopen("video.txt", "rb");
    t0 = clock();
    for (i=0; i < 1000000; i++)
    {
        fseek(f1, 0, SEEK_SET);
    }
    delta = (float)(clock() - t0) / CLOCKS_PER_SEC;
    printf("%.3f\n", delta);
    fclose(f1);
}


From martin.hellwig at dcuktec.org  Tue Mar  9 18:58:01 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Tue, 09 Mar 2010 23:58:01 +0000
Subject: equivalent of Ruby's Pathname?
In-Reply-To: <d871b429-deff-4974-84f3-d5f19c6b9042@u15g2000prd.googlegroups.com>
References: <843d5af9-e8db-4352-a853-4c99664eadf8@k6g2000prg.googlegroups.com>
	<22ac2bce-cf12-45e2-9d89-d7df56a2faa7@b1g2000prc.googlegroups.com>
	<dcace5fc-5ae9-4756-942d-6da7da2f660d@s36g2000prh.googlegroups.com>
	<91770e62-2fef-45c9-9e4d-e64088058af1@g8g2000pri.googlegroups.com>
	<7tceiuF94hU1@mid.individual.net>
	<d871b429-deff-4974-84f3-d5f19c6b9042@u15g2000prd.googlegroups.com>
Message-ID: <hn6na6$2ci$1@news.eternal-september.org>

On 02/09/10 14:00, Phlip wrote:
<cut>
> Ah, now we get down to the root of the problem. Because Python is so
> stuck on the "one best way to do it" mentality, language bigotry
> prevented the Committee from picking from among several equally valid
> but non-best options. And after 20 years of growth, Python still has
> no Pathname class. What a mature community! C-:
>
<cut>
Well even if this statement would be true, I personally think that not 
proclaiming something a 'standard' if you are sure that you are not sure 
about it, is a virtue.

-- 
mph


From ptmcg at austin.rr.com  Tue Mar  9 19:11:35 2010
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Tue, 9 Mar 2010 16:11:35 -0800 (PST)
Subject: file seek is slow
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>
Message-ID: <daf5c75e-8139-4a4a-8c27-5cef00327bb1@o3g2000yqb.googlegroups.com>

This is a pretty tight loop:

for i in xrange(1000000):
       f1.seek(0)

But there is still a lot going on, some of which you can lift out of
the loop.  The easiest I can think of is the lookup of the 'seek'
attribute on the f1 object.  Try this:

f1_seek = f1.seek
for i in xrange(1000000):
       f1_seek(0)

How does that help your timing?

-- Paul


From greg.ewing at canterbury.ac.nz  Tue Mar  9 19:17:48 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Wed, 10 Mar 2010 13:17:48 +1300
Subject: Reverse engineering CRC?
In-Reply-To: <mailman.474.1268090664.23598.python-list@python.org>
References: <7vj7fdFnnjU1@mid.individual.net>	<4b9471ee$0$8836$c3e8da3@news.astraweb.com>	<7vk3eiFtivU1@mid.individual.net>	<mailman.459.1268053659.23598.python-list@python.org>	<7vlameF7goU1@mid.individual.net>
	<mailman.474.1268090664.23598.python-list@python.org>
Message-ID: <7vo661F7s7U1@mid.individual.net>

Dave Angel wrote:

> If you assume it's done in a single pass, and you know which byte is the 
> end of the buffer, I'd think you could learn a lot by just tweaking that 
> last byte.

I'm sure I would, but unfortunately I can't control the
last byte. The bytes that I can influence are some distance
back from the end of the data.

-- 
Greg


From robin.rytich at gmail.com  Tue Mar  9 20:57:47 2010
From: robin.rytich at gmail.com (Robin Rytich)
Date: Wed, 10 Mar 2010 04:57:47 +0300
Subject: Knight's tour Warndorff's algorithm problem
Message-ID: <1268186267.11433.47.camel@rytich-laptop>

Hi all

I'm having some troubles with writing Knight's tour
(http://en.wikipedia.org/wiki/Knight%27s_tour) solution in Python 3. I'm
using Warnsdorff's algorithm (http://en.wikipedia.org/wiki/Knight%
27s_tour#Algorithm) and I'm wondering why it doesn't work with boards of
certain sizes. I've written a solution and I like it but it does not
work correctly for 15x15, 26x26, 27x27 and 32x32 boards (don't know why;
checked from 5x5 to 40x40). So I'd be really glad if you tell me whether
I am too stupid for Python or for Discrete Math? In other words, did I
implemented Warnsdorff's algorithm in Python 3 correctly or maybe all my
troubles are because I haven't read tutorial with enough patience?

P.S. Warnsdorff's algorithm says that it's not really important which
square to choose between those which have equal amount of ways out. In
spite of that I tried to changed my program and added '=' to condition
at line 78. Results were quite surprising: now it works for 5x5,
6x6, ... 34x34 but not for 35x35!
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From wuwei23 at gmail.com  Tue Mar  9 21:10:20 2010
From: wuwei23 at gmail.com (alex23)
Date: Tue, 9 Mar 2010 18:10:20 -0800 (PST)
Subject: Named loops for breaking
References: <6d6a35e8-f09c-4792-8abe-5a0dc24d214e@g28g2000yqh.googlegroups.com>
Message-ID: <41d99d1f-7499-4c3e-8c25-8d58a6c16bd3@c37g2000prb.googlegroups.com>

Daniel Klein <bri... at gmail.com> wrote:
> Basically I'm wondering if there are any plans to implemented named
> loops in Python, so I can tell a break command to break out of a
> specific loop in the case of nested loops.

You should be able to do this with the goto module: http://entrian.com/goto/

But please note that I'm not seriously advocating its use :)


From dr.cg at 126.com  Tue Mar  9 22:36:10 2010
From: dr.cg at 126.com (CHEN Guang)
Date: Wed, 10 Mar 2010 11:36:10 +0800 (CST)
Subject: Six Minutes and fourty two seconds
Message-ID: <5fa8d25e.47df.1274624d257.Coremail.dr.cg@126.com>

>Tobiah wrote:
>> Now that I use python, this is the amount of time 
>> per day that I spend adding forgotten semicolons while
>> debugging other languages.
>>   
>What compels you to write Python code without semicolons?
>Frederic
 
Try the C language without semicolons and braces
http://pythoidc.googlecode.com
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From wuwei23 at gmail.com  Tue Mar  9 23:01:01 2010
From: wuwei23 at gmail.com (alex23)
Date: Tue, 9 Mar 2010 20:01:01 -0800 (PST)
Subject: odd error
References: <bc7f680c1003090555o4d09c7b1l40bb21967d767885@mail.gmail.com> 
	<4B96787B.3030907@timgolden.me.uk>
	<mailman.499.1268153292.23598.python-list@python.org>
Message-ID: <5bfe3bef-3e27-4e46-a3ae-3f029630d80a@c37g2000prb.googlegroups.com>

Alex Hall <mehg... at gmail.com> wrote:
> Why would the sequence
> matter, or does it not and I am doing something else wrong? Here is a
> sample of my dictionary:

Showing us the code that handles the dictionary lookup + function
calling would probably help us a lot more here.


From fukazawa at gmail.com  Wed Mar 10 00:01:48 2010
From: fukazawa at gmail.com (Andy)
Date: Tue, 9 Mar 2010 21:01:48 -0800 (PST)
Subject: pyserial script doesnt execute properly
References: <c083a958-7320-4fd3-82ae-cf4da7808af6@u15g2000prd.googlegroups.com>
	<4b9612bc$0$6059$426a74cc@news.free.fr>
	<bf3cbd2a-eb4c-455c-9b01-de44d6b35f60@v34g2000prm.googlegroups.com>
	<6596caf4-8d36-40b4-8e8d-a5ed2a18f245@z1g2000prc.googlegroups.com>
Message-ID: <9a15f63e-c486-40fd-bd6f-9c328328f0a1@a16g2000pre.googlegroups.com>

Hi Kishore,

Have you tried "ser=serial.Serial(port='COM2', baudrate=9600)" instead
of "port='\\.\COM2'"?

Also, I'd suggest you temporarily define some other parameters that
now you're leaving to default values.  From the documentation of
pyserial:
readline(size=None, eol='\n')

You're sure that your Arduino device is sending a '\n' right after the
'1', aren't you?  Or is it two consecutive '1'?

And another idea:  If this is your first experience with PySerial, I
suggest you first use some free software as counterpart to your
Arduino device in order to confirm the microcontroller is sending
exactly what you think it is sending.  In other words, is it sending
to your Python program '11' or '1\n1\n'?  Also to confirm other
details such as parity bits, baud, etc.

Cheers,
Andy


From showell30 at yahoo.com  Wed Mar 10 00:23:08 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Tue, 9 Mar 2010 21:23:08 -0800 (PST)
Subject: Reverse engineering CRC?
References: <7vj7fdFnnjU1@mid.individual.net>
Message-ID: <3b1dce65-99ed-471a-8494-9eaf0e6d44ad@e19g2000prn.googlegroups.com>

On Mar 7, 7:09?pm, Gregory Ewing <greg.ew... at canterbury.ac.nz> wrote:
> Given some known data/crc pairs, how feasible is it to
> figure out the polynomial being used to generate the crc?
>
> In the case I'm looking at, it appears that the crc
> size may be at least 24 bits, so just trying all possible
> polynomials probably isn't doable.
>
> An article I found hints at the possibility of using
> GCDs to make the search more efficient, but doesn't go
> into any details. Anyone know of any literature about
> this?
>
> If it helps, I have the ability to generate test cases
> with known message contents to some extent, although
> I don't have complete control over the contents. Also
> it's a manual process, so generating large numbers of
> them automatically isn't an option.
>


Hi Greg.  I would at least flip one bit at a time on the first byte of
your data to see if the transformation is bitwise.


From rami.chowdhury at gmail.com  Wed Mar 10 00:24:00 2010
From: rami.chowdhury at gmail.com (Rami Chowdhury)
Date: Tue, 9 Mar 2010 21:24:00 -0800
Subject: Down casting Python objects
In-Reply-To: <7659cab31003091326i6f3ab6bta3b8f5948ab7b0ff@mail.gmail.com>
References: <7659cab31003091326i6f3ab6bta3b8f5948ab7b0ff@mail.gmail.com>
Message-ID: <41B1429F-57E8-4F58-883E-03F20FA9A635@gmail.com>


On Mar 9, 2010, at 13:26 , Andrey Fedorov wrote:

> So I have `x', a instance of class `Foo'. I also have class `Bar', a class extending `Foo' with a couple of methods. I'd like to "down cast" x as efficiently as possible. Is it OK to just set `x.__class__ = Bar' and expect things to work OK in all major versions of CPython? 

Could you tell us *why* you need to down-cast x? Explicit type-casting is usually unnecessary in Python...

-------------
Rami Chowdhury
"Never assume malice when stupidity will suffice." -- Hanlon's Razor
408-597-7068 (US) / 07875-841-046 (UK) / 0189-245544 (BD)

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From stava at telcotec.se  Wed Mar 10 00:31:19 2010
From: stava at telcotec.se (Lars Stavholm)
Date: Wed, 10 Mar 2010 11:01:19 +0530
Subject: pexpect and logging integration
Message-ID: <4B972EA7.50807@telcotec.se>

Hi all,

has anyone managed to integrate pexpect and logging?

I.e., I'd like to be able to pick up the dialog,
commands sent and responses received, in my logging.
I know about the pexpect logfile, and I can log things
to stdout or stderr, but I really need to log using the
python logging library.

Any thoughts appreciated
/Lars



From gagsl-py2 at yahoo.com.ar  Wed Mar 10 00:37:14 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 10 Mar 2010 02:37:14 -0300
Subject: Knight's tour Warndorff's algorithm problem
Message-ID: <op.u9b68cuyx6zn5v@lepton.softlabbsas.com.ar>

El 9 mar, 22:57, Robin Rytich escribi?:

> I'm having some troubles with writing Knight's tour
> (http://en.wikipedia.org/wiki/Knight%27s_tour) solution in Python 3. I'm
> using Warnsdorff's algorithm (http://en.wikipedia.org/wiki/Knight%
> 27s_tour#Algorithm) and I'm wondering why it doesn't work with boards of
> certain sizes. I've written a solution and I like it but it does not
> work correctly for 15x15, 26x26, 27x27 and 32x32 boards (don't know why;
> checked from 5x5 to 40x40).

Warnsdorff's algorithm is heuristic; it works most of the time, but in  
some cases leads to a dead end and you have to backtrack and try another  
alternative.
The starting square is important; if you start at 1,1 (instead of 0,0)  
your program finds a solution for all those problematic board sizes.

> So I'd be really glad if you tell me whether
> I am too stupid for Python or for Discrete Math? In other words, did I
> implemented Warnsdorff's algorithm in Python 3 correctly or maybe all my
> troubles are because I haven't read tutorial with enough patience?

Your implementation looks fine to me. Some comments on the code itself:

> class ChessBoard:
> 	
> 	size = 8   # Board square width and height.
> 	cell = []  # Embedded list of board cells.

This sets a class attribute (as opposed to normal, instance attributes)  
which is shared by all ChessBoard instances (this really should be covered  
in the FAQ!). You really want an instance attribute here: do `self.cell =  
[]` in __init__

> 	def __init__(self):
> 		
> 		import sys
> 		
> 		# Reading board size.
> 		
> 		if len(sys.argv) >= 2:
> 			self.size = int(sys.argv[1])

I would process command line arguments when the script starts, and supply  
size/x/y as parameters to the ChessBoard constructor. In other words, the  
caller must provide those parameters, it's not ChessBoard responsability  
to hunt for them.

> 		if (next != 0):
> 			(self.y, self.x) = (next.y, next.x)

All those six () are unnecessary.

Also, `next` might refer to integer 0 or a ChessBoardSquare instance.  
That's perfectly legal in Python, but *I* prefer to assign objects of the  
same type when using the same variable name. In this case, 0 is used only  
as a marker, any other non-ChessBoardSquare instance would do, and I'd  
substitute None instead.
(This is more than a stylistic whim: some JIT compiler may benefit from  
knowing the object type won't change)

> 	def printField(self):
> 		""" This function prints field to standart output.		for i in  
> range(self.size):
> 			for j in range(self.size):
> 				print(self.cell[i][j].status, end = '')
> 			print()

Instead of artificially iterate over the *indices* to finally reach the  
objects, you may directly iterate over the board squares:

		for row in self.cell:
			for square in row:
				print(square.status, end = '')
			print()

Later:

> 		applicants = [[y - 1, x - 2], [y - 1, x + 2],
> 		              [y + 1, x - 2], [y + 1, x + 2],
> 		              [y - 2, x - 1], [y - 2, x + 1],
> 		              [y + 2, x - 1], [y + 2, x + 1]]
>		result = []
> 		for applicant in applicants:
> 			if applicant[0] < 0 or applicant[0] >= self.size:
> 				continue
> 			if applicant[1] < 0 or applicant[1] >= self.size:
> 				continue
> 			if self.cell[applicant[0]][applicant[1]].status == 0:
> 				result.append(self.cell[applicant[0]][applicant[1]])

It would be better to use meaningful names instead of applicant[0],  
applicant[1] -- let me re-use y,x. We can write a more concise condition:

         result = []
         for y,x in applicants:
             if not 0 <= y < self.size:
                 continue
             if not 0 <= x < self.size:
                 continue
             if self.cell[y][x].status == 0:
                 result.append(self.cell[y][x])

Now, lets combine all those conditions into a single one:

         result = []
         for y,x in applicants:
             if 0 <= y < self.size and 0 <= x < self.size and  
self.cell[y][x].status == 0:
                 result.append(self.cell[y][x])

Finally, a code pattern like the above can always be rewritten as a list  
comprehension:

         result = [self.cell[y][x]
             for y,x in applicants
             if 0 <= y < self.size and 0 <= x < self.size and  
self.cell[y][x].status == 0
             ]

Apart from these points, your program looks fine to me. You even added  
function docstrings! (ok, they might be more informative, but at least  
they exist!)

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Wed Mar 10 01:29:02 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 10 Mar 2010 03:29:02 -0300
Subject: Named loops for breaking
References: <6d6a35e8-f09c-4792-8abe-5a0dc24d214e@g28g2000yqh.googlegroups.com>
Message-ID: <op.u9b9moihx6zn5v@lepton.softlabbsas.com.ar>

En Tue, 09 Mar 2010 18:41:10 -0300, Daniel Klein <bringa at gmail.com>  
escribi?:

> Basically I'm wondering if there are any plans to implemented named
> loops in Python, so I can tell a break command to break out of a
> specific loop in the case of nested loops.

See PEP3136 [1] and its rejection note [2]
I think you may find some more discussion in the python-ideas list.

> Currently I'm using boolean
> flag variables, but I find that very clumsy. I know this idea of
> breaking out of specific loops from javascript; I guess java does it
> too. It just seems a very Pythonian idea to me: clear, promotes code
> legibility, seems obvious.

Although I've occasionally missed the feature myself, I agree with Guido's  
arguments against it. You have several alternatives: refactor the loop  
into an auxiliary function, use a specific exception, add boolean flags,  
or repeat the test at the outer levels. (I usually choose the first).

[1] http://www.python.org/dev/peps/pep-3136/
[2] http://mail.python.org/pipermail/python-3000/2007-July/008663.html

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Wed Mar 10 01:35:12 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 10 Mar 2010 03:35:12 -0300
Subject: How to dynamic insert more conditional statements into a function
References: <93ea751a-9d23-4186-897c-c2b079cc5c6c@e1g2000yqh.googlegroups.com>
Message-ID: <op.u9b9wyc9x6zn5v@lepton.softlabbsas.com.ar>

En Tue, 09 Mar 2010 18:48:42 -0300, Shane <shengcer at gmail.com> escribi?:

> Hi I am a newbie for Python
>
> Here is a question, say I have a list L,
>
> function foo is:
>
> def foo(L):
>     if L[0] > 0: return True
>
> if later I want another function goo which returns "True" when L[0]
> and L[1] are both > 0, i.e.,
>
> def goo(L):
>     if L[0] > 0 and L[1] > 0: return True
>
> Can anybody tell me how can I write the function "goo" based upon the
> function "foo"? Thanks!
> I know if it is implementable, I should use "decorator". But I just
> cannot figure out how.

To implement goo based on foo:

def goo(L):
   if foo(L) and L[1]>0: return True

I don't see how to use a decorator here - maybe your example became too  
simple to be useful. A more realistic use case?

-- 
Gabriel Genellina



From agoretoy at gmail.com  Wed Mar 10 01:58:13 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Wed, 10 Mar 2010 00:58:13 -0600
Subject: datelib pythonification
In-Reply-To: <b11a98b1-4e43-4d74-88d7-9b24cd0743ed@o16g2000prh.googlegroups.com>
References: <c9d33c541002201626o4cb51819ycea15bb24933d5d@mail.gmail.com> 
	<mailman.15.1266716296.4577.python-list@python.org>
	<b11a98b1-4e43-4d74-88d7-9b24cd0743ed@o16g2000prh.googlegroups.com>
Message-ID: <c9d33c541003092258o820adf7i2ec916b5eb035051@mail.gmail.com>

>
> DATE_TYPE = type(date.today())

def dates_diff(self, *targs):

   nargs = len(targs)

   if nargs == 0:

       return self.enddate - self.startdate

   if nargs == 1:

       arg = targs[0]

       if not isinstance(arg, (list, tuple)) or len(arg) != 2:

           raise Exception(

               "single arg must be list or tuple of length 2")

       start, end = arg

   elif nargs == 2:

       start, end = targs

   else:

       raise Exception("expected 0,1, or 2 args; found %d" % nargs)

   if isinstance(start, DATE_TYPE) and isinstance(end, DATE_TYPE):

       return end - start

   raise Exception("both values must be of type DATE_TYPE")


> HTH,


> John


This is awesome. Thank you for your contribution. I wasn't sure anyone was
gonna reply; just saw your reply, pardon my delay. I will make the changes
you suggested to other functions that apply in the lib as well(mimic that
style of coding). Make it so it raises exceptions instead of failing over
quietly(fallback to the __init__ passed args in other words).

Is There any other functions or methods that you would recommend be added to
the lib?

Any and all other suggestions are welcome. I love python and you guys are
practically helping me expand on my knowledge in this realm :)

I haven't touched it in a little bit so after I mess with it again I'll be
able to add more this thread/lib or whatever.

Thanks Again,
-Alex Goretoy
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From gagsl-py2 at yahoo.com.ar  Wed Mar 10 02:04:04 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 10 Mar 2010 04:04:04 -0300
Subject: Down casting Python objects
References: <7659cab31003091326i6f3ab6bta3b8f5948ab7b0ff@mail.gmail.com>
Message-ID: <op.u9ca82qzx6zn5v@lepton.softlabbsas.com.ar>

En Tue, 09 Mar 2010 18:26:52 -0300, Andrey Fedorov <anfedorov at gmail.com>  
escribi?:

> So I have `x', a instance of class `Foo'. I also have class `Bar', a  
> class
> extending `Foo' with a couple of methods. I'd like to "down cast" x as
> efficiently as possible. Is it OK to just set `x.__class__ = Bar' and  
> expect
> things to work OK in all major versions of CPython?

If the assignment x.__class__ = Bar succeeds, yes, that's enough. But you  
may not be able to reassign __class__ in some cases (e.g. Foo defines  
__slots__ but Bar doesn't, so you have a layout conflict).

Of course, you always have to make sure Bar invariants hold on this  
particular instance...

I must ask, why you didn't create a Bar instance in the first place?

-- 
Gabriel Genellina



From timr at probo.com  Wed Mar 10 02:08:48 2010
From: timr at probo.com (Tim Roberts)
Date: Tue, 09 Mar 2010 23:08:48 -0800
Subject: file seek is slow
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>
Message-ID: <iogep59cp5756f63cpqq9dk7m90hdjht6c@4ax.com>

Metalone <jcb at iteris.com> wrote:
>
>static void main(int argc, char *argv[])

As a side note, do you realize that this definition is invalid, in two
ways?  "main" cannot be declared "static".  The whole reason we use the
special name "main" is so that the startup code in the C run-time can link
to it.  If "main" is static, it won't be exposed in the object file, and
the linker couldn't find it.  It happens to work here because your C
compiler knows about "main" and discards the "static", but that's not a
good practice.

Further, it's not valid to have "main" return "void".  The standards
require that it be declared as returning "int".  Again, "void" happens to
work in VC++, but there are architectures where it does not.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From agoretoy at gmail.com  Wed Mar 10 02:14:45 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Wed, 10 Mar 2010 01:14:45 -0600
Subject: datelib pythonification
In-Reply-To: <c9d33c541003092258o820adf7i2ec916b5eb035051@mail.gmail.com>
References: <c9d33c541002201626o4cb51819ycea15bb24933d5d@mail.gmail.com> 
	<mailman.15.1266716296.4577.python-list@python.org>
	<b11a98b1-4e43-4d74-88d7-9b24cd0743ed@o16g2000prh.googlegroups.com>
	<c9d33c541003092258o820adf7i2ec916b5eb035051@mail.gmail.com>
Message-ID: <c9d33c541003092314v38e37365we64b3b936a3300ac@mail.gmail.com>

I have another quick question. What would be the best way to implement dates
length function?
or should i just leave that up to the user using the lib?
-Alex Goretoy
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From agoretoy at gmail.com  Wed Mar 10 02:23:31 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Wed, 10 Mar 2010 01:23:31 -0600
Subject: datelib pythonification
In-Reply-To: <c9d33c541003092314v38e37365we64b3b936a3300ac@mail.gmail.com>
References: <c9d33c541002201626o4cb51819ycea15bb24933d5d@mail.gmail.com> 
	<mailman.15.1266716296.4577.python-list@python.org>
	<b11a98b1-4e43-4d74-88d7-9b24cd0743ed@o16g2000prh.googlegroups.com>
	<c9d33c541003092258o820adf7i2ec916b5eb035051@mail.gmail.com> 
	<c9d33c541003092314v38e37365we64b3b936a3300ac@mail.gmail.com>
Message-ID: <c9d33c541003092323p7646676w35751916811cf095@mail.gmail.com>

>>> import datelib
>>> datelib.datelib().dates_list()
[datetime.date(2009, 3, 10), datetime.date(2009, 4, 10), datetime.date(2009,
5, 10), datetime.date(2009, 6, 10), datetime.date(2009, 7, 10),
datetime.date(2009, 8, 10), datetime.date(2009, 9, 10), datetime.date(2009,
10, 10), datetime.date(2009, 11, 10), datetime.date(2009, 12, 10),
datetime.date(2010, 1, 10), datetime.date(2010, 2, 10), datetime.date(2010,
3, 10)]
>>> len(datelib.datelib().dates_list())
13
>>>
I know i can do this and untested below:

function dates_len(*targs, **dargs)
    return len(self.dates_list(*targs, **dargs))

Is this bloating the lib with unnecessary functions/methods?

-Alex Goretoy
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From gagsl-py2 at yahoo.com.ar  Wed Mar 10 03:07:18 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 10 Mar 2010 05:07:18 -0300
Subject: pyserial script doesnt execute properly
References: <c083a958-7320-4fd3-82ae-cf4da7808af6@u15g2000prd.googlegroups.com>
	<4b9612bc$0$6059$426a74cc@news.free.fr>
	<bf3cbd2a-eb4c-455c-9b01-de44d6b35f60@v34g2000prm.googlegroups.com>
Message-ID: <op.u9cd6gd0x6zn5v@lepton.softlabbsas.com.ar>

En Tue, 09 Mar 2010 12:01:22 -0300, kishore <kishoreinme at gmail.com>
escribi?:
>>
>> > Iam using python 2.5.4
>> > pyserial  2.4
>> > pywin32-214
>> > on windows 7
>>
>> > i hav a small test script written to query a serial device (arduino)
>> > and get back reply appropriately
>>
>
> Thanks for your response
> i tried closing idle and the following code prints
> port opened
> Write failed
>
> code:
>
> import serial
> import time
> ser=serial.Serial(port='\\.\COM2', baudrate=9600)

If you want a string containing these 8 characters \\.\COM2 you have to
write it either as r'\\.\COM2' or '\\\\.\\COM2'

> if ser:
> 	print 'port opened'

Either the Serial object is constructed and returned, or an exception is
raised. 'if ser:' has no sense; Python is not C...

> ser.open()
> if ser.write('1'):
> 	print 'Write success'
> else:
> 	print 'write failed'

The write method, when successful, implicitly returns None. None has a
false boolean value, so your code will always print 'write failed'.

Usually, in Python, error conditions are marked by raising an exception.
Using return values to indicate success/failure is uncommon.

Also, are you sure the device doesn't expect a newline character? '1\n'?

You may need to call ser.flushOutput() to ensure the output buffer is
actually emptied.

> time.sleep(1)
> a=ser.readline()

print repr(a)

> time.sleep(1)
> b=ser.readline()

print repr(b)

> ser.close()

> I believe this might be a serial port access error.
> how to solve this?
> Any suggestions?

I don't think so. If you could not access the serial port, you'd have seen
an IOError exception or similar.

-- 
Gabriel Genellina



From kishoreinme at gmail.com  Wed Mar 10 03:39:36 2010
From: kishoreinme at gmail.com (kishore)
Date: Wed, 10 Mar 2010 00:39:36 -0800 (PST)
Subject: pyserial script doesnt execute properly
References: <c083a958-7320-4fd3-82ae-cf4da7808af6@u15g2000prd.googlegroups.com>
	<4b9612bc$0$6059$426a74cc@news.free.fr>
	<bf3cbd2a-eb4c-455c-9b01-de44d6b35f60@v34g2000prm.googlegroups.com>
	<mailman.535.1268208452.23598.python-list@python.org>
Message-ID: <85262eff-ac2d-4fe1-bca3-2840c13ef06d@b36g2000pri.googlegroups.com>

On Mar 10, 1:07?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Tue, 09 Mar 2010 12:01:22 -0300, kishore <kishorei... at gmail.com>
> escribi?:
>
>
>
>
>
> >> > Iam using python 2.5.4
> >> > pyserial ?2.4
> >> > pywin32-214
> >> > on windows 7
>
> >> > i hav a small test script written to query a serial device (arduino)
> >> > and get back reply appropriately
>
> > Thanks for your response
> > i tried closing idle and the following code prints
> > port opened
> > Write failed
>
> > code:
>
> > import serial
> > import time
> > ser=serial.Serial(port='\\.\COM2', baudrate=9600)
>
> If you want a string containing these 8 characters \\.\COM2 you have to
> write it either as r'\\.\COM2' or '\\\\.\\COM2'
>
> > if ser:
> > ? ?print 'port opened'
>
> Either the Serial object is constructed and returned, or an exception is
> raised. 'if ser:' has no sense; Python is not C...
>
> > ser.open()
> > if ser.write('1'):
> > ? ?print 'Write success'
> > else:
> > ? ?print 'write failed'
>
> The write method, when successful, implicitly returns None. None has a
> false boolean value, so your code will always print 'write failed'.
>
> Usually, in Python, error conditions are marked by raising an exception.
> Using return values to indicate success/failure is uncommon.
>
> Also, are you sure the device doesn't expect a newline character? '1\n'?
>
> You may need to call ser.flushOutput() to ensure the output buffer is
> actually emptied.
>
> > time.sleep(1)
> > a=ser.readline()
>
> print repr(a)
>
> > time.sleep(1)
> > b=ser.readline()
>
> print repr(b)
>
> > ser.close()
> > I believe this might be a serial port access error.
> > how to solve this?
> > Any suggestions?
>
> I don't think so. If you could not access the serial port, you'd have seen
> an IOError exception or similar.
>
> --
> Gabriel Genellina

thanks Gabriel & Andy..ll get back soon here after trying ur
suggestions


From jeherul at gmail.com  Wed Mar 10 04:06:28 2010
From: jeherul at gmail.com (JEHERUL)
Date: Wed, 10 Mar 2010 14:36:28 +0530
Subject: about Telnetlib problem
Message-ID: <46c1bcc21003100106s1db37a95ke928306c5e79d088@mail.gmail.com>

Dear All

I am trying to telnet to a Cisco router . Following is my code .

#code router.py

import getpass
import sys
import telnetlib

HOST = "router address"               # router address is ommitted for
security reason
user = raw_input("Username : ")
password = getpass.getpass()

tn = telnetlib.Telnet(HOST)

tn.read_until("Username: ")
tn.write(user + "\n")
tn.read_until("Password: ")
tn.write(password + "\n")


tn.read_until("I>")
tn.write("sh int f0/0")

print "Just to check"


print tn.read_all()

print "after read"
tn.write("exit\n")



But when I execute the program I got the following error .


Traceback (most recent call last):
  File "router.py", line 23, in ?
    print tn.read_all()
  File "/usr/lib/python2.4/telnetlib.py", line 330, in read_all
    self.fill_rawq()
  File "/usr/lib/python2.4/telnetlib.py", line 521, in fill_rawq
    buf = self.sock.recv(50)

Please help me .

Regards
-- 
Jeherul Islam
Indian Institute of Information Technology and Management .
Gwalior (MP)
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From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 10 04:16:27 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 10 Mar 2010 09:16:27 GMT
Subject: odd error
References: <bc7f680c1003090555o4d09c7b1l40bb21967d767885@mail.gmail.com>
	<4B96787B.3030907@timgolden.me.uk>
	<mailman.499.1268153292.23598.python-list@python.org>
Message-ID: <pan.2010.03.10.09.16.27@REMOVE.THIS.cybersource.com.au>

On Tue, 09 Mar 2010 11:48:10 -0500, Alex Hall wrote:

> Okay, I changed the keycode from 99 (c) to 107 (k), and the errors have
> disappeared. However, now the function that should be called is not. As
> I said in a previous message, I have always had trouble with this sort
> of keystroke dictionary. It seems like, if a keycode is out of order or
> not one more than the number before it, the function to which it is tied
> will not get called.

Dictionaries aren't ordered, that can't be the problem.


> keys.append({
>   1 : (48, win32con.MOD_CONTROL),
>   2 : (49, win32con.MOD_CONTROL), [...]

Dicts don't have an append message. Why are you building a list and 
adding a dictionary to it?

The question is, how many such dicts are in the list, and which one are 
you searching for the function? Is it possible that the problem is that 
you have multiple dicts in the keys list, and then perform your look-ups 
on the wrong one?



Likewise for your list of functions:

> funcs.append({
>   1 : exitProgram,
>   2 : arm.sayLoad1, [...]

Perhaps all you need is a single dict, mapping characters to functions:

funcs = {  # Just a dict
    # keycode: function
    'q': exitProgram,
    'a': arm.sayLoad1
    # etc.
    }


Then whenever you get a keyboard event, convert it to the character:

keycode = 113
c = chr(keycode)
funcs(c)()




-- 
Steven


From mail at timgolden.me.uk  Wed Mar 10 04:25:53 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 10 Mar 2010 09:25:53 +0000
Subject: odd error
In-Reply-To: <pan.2010.03.10.09.16.27@REMOVE.THIS.cybersource.com.au>
References: <bc7f680c1003090555o4d09c7b1l40bb21967d767885@mail.gmail.com>	<4B96787B.3030907@timgolden.me.uk>	<mailman.499.1268153292.23598.python-list@python.org>
	<pan.2010.03.10.09.16.27@REMOVE.THIS.cybersource.com.au>
Message-ID: <4B9765A1.1030509@timgolden.me.uk>

On 10/03/2010 09:16, Steven D'Aprano wrote:
> Perhaps all you need is a single dict, mapping characters to functions:
>
> funcs = {  # Just a dict
>      # keycode: function
>      'q': exitProgram,
>      'a': arm.sayLoad1
>      # etc.
>      }
>
>
> Then whenever you get a keyboard event, convert it to the character:
>
> keycode = 113
> c = chr(keycode)
> funcs(c)()

FWIW (altho' it's not clear from the OP's code) he's basically
doing this:

http://timgolden.me.uk/python/win32_how_do_i/catch_system_wide_hotkeys.html

which uses the dictionary keys as an id in the call to RegisterHotKey.

Obviously, that doesn't explain why he's building lists of dictionaries.


TJG


From robin.rytich at gmail.com  Wed Mar 10 04:32:05 2010
From: robin.rytich at gmail.com (Robin Rytich)
Date: Wed, 10 Mar 2010 12:32:05 +0300
Subject: Knight's tour Warndorff's algorithm problem
In-Reply-To: <op.u9b68cuyx6zn5v@lepton.softlabbsas.com.ar>
References: <op.u9b68cuyx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <1268213525.12869.188.camel@rytich-laptop>

On Wed, 2010-03-10 at 02:37 -0300, Gabriel Genellina wrote:

> Warnsdorff's algorithm is heuristic; it works most of the time, but in  
> some cases leads to a dead end and you have to backtrack and try another  
> alternative.
> The starting square is important; if you start at 1,1 (instead of 0,0)  
> your program finds a solution for all those problematic board sizes.

Wow, didn't know about that. It seems to be a good idea for me to make a
little research around this question.

> Some comments on the code itself:

> This sets a class attribute (as opposed to normal, instance attributes)  
> which is shared by all ChessBoard instances (this really should be covered  
> in the FAQ!). 

Damn, I'm ashamed.

About other points, I actually totally agree with you (and corrected
almost everything before received your letter). Thank you for your
remarks, I'll review public code more careful next time.

Robin Rytich



From mehgcap at gmail.com  Wed Mar 10 07:09:13 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Wed, 10 Mar 2010 07:09:13 -0500
Subject: odd error
In-Reply-To: <4B9765A1.1030509@timgolden.me.uk>
References: <bc7f680c1003090555o4d09c7b1l40bb21967d767885@mail.gmail.com>
	<4B96787B.3030907@timgolden.me.uk>
	<mailman.499.1268153292.23598.python-list@python.org>
	<pan.2010.03.10.09.16.27@REMOVE.THIS.cybersource.com.au>
	<4B9765A1.1030509@timgolden.me.uk>
Message-ID: <bc7f680c1003100409n751f2911rbc1d43e3fd386919@mail.gmail.com>

I am honestly a bit lost as to why keys.append() is not a good choice
here, but I have it working. I apparently have to use the ascii for
capital letters if I am capturing the shift modifier, not the
lowercase ascii. Using 67 instead of 99 works as expected.

I use append because the program has three different modes.
Eventually, each mode may have its own keystrokes. When the user
switches modes, the previous mode's keystrokes are unregistered and
the new keystrokes, keys[currentModeNumber], are registered. The same
with the functions; when a function is called from the dictionary, it
is called using funcs[currentModeNumber]. Again, this lets me put all
my functions into one big list, where each member of the list is a
dictionary. I probably have the terminology wrong, but hopefully that
makes sense. Sorry for not explaining that earlier, but I was just
looking for problems in the key codes. Thanks for your help!

On 3/10/10, Tim Golden <mail at timgolden.me.uk> wrote:
> On 10/03/2010 09:16, Steven D'Aprano wrote:
>> Perhaps all you need is a single dict, mapping characters to functions:
>>
>> funcs = {  # Just a dict
>>      # keycode: function
>>      'q': exitProgram,
>>      'a': arm.sayLoad1
>>      # etc.
>>      }
>>
>>
>> Then whenever you get a keyboard event, convert it to the character:
>>
>> keycode = 113
>> c = chr(keycode)
>> funcs(c)()
>
> FWIW (altho' it's not clear from the OP's code) he's basically
> doing this:
>
> http://timgolden.me.uk/python/win32_how_do_i/catch_system_wide_hotkeys.html
>
> which uses the dictionary keys as an id in the call to RegisterHotKey.
>
> Obviously, that doesn't explain why he's building lists of dictionaries.
>
>
> TJG
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From mail at timgolden.me.uk  Wed Mar 10 07:15:06 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 10 Mar 2010 12:15:06 +0000
Subject: odd error
In-Reply-To: <bc7f680c1003100409n751f2911rbc1d43e3fd386919@mail.gmail.com>
References: <bc7f680c1003090555o4d09c7b1l40bb21967d767885@mail.gmail.com>	
	<4B96787B.3030907@timgolden.me.uk>	
	<mailman.499.1268153292.23598.python-list@python.org>	
	<pan.2010.03.10.09.16.27@REMOVE.THIS.cybersource.com.au>	
	<4B9765A1.1030509@timgolden.me.uk>
	<bc7f680c1003100409n751f2911rbc1d43e3fd386919@mail.gmail.com>
Message-ID: <4B978D4A.5060204@timgolden.me.uk>

On 10/03/2010 12:09, Alex Hall wrote:
> I am honestly a bit lost as to why keys.append() is not a good choice
> here, but I have it working.

That's ok; it's just not clear from the context why you have a list
of dicts but your comment about different modes explains that.

> I apparently have to use the ascii for
> capital letters if I am capturing the shift modifier, not the
> lowercase ascii. Using 67 instead of 99 works as expected.

That's probably because the os is "preprocessing" the keystroke so
that shift-a returns "A" and not "a". You might find that you don't
even *need* the shift modifier in those circs.

If I get the time this pm, I'll try to put together some example
code which runs to more than 10 items in a dict just in case there
is some bizarre cornercase which is causing a problem but I honestly
doubt it.

TJG


From paskari007 at yahoo.ca  Wed Mar 10 07:19:29 2010
From: paskari007 at yahoo.ca (PEYMAN ASKARI)
Date: Wed, 10 Mar 2010 04:19:29 -0800 (PST)
Subject: Importing Modules
Message-ID: <676034.43316.qm@web30001.mail.mud.yahoo.com>

Hello

I frequent the PyGtk mailing list all the time, but this is the first time I am posting here =)

I wanted to know if imported classes are treated differently than internal classes.

I have attached a minimal example which points out what I mean. Essentially, if I create a class:

class A():
?__init__(self):
? pass

and call A, or A() I get something to the effect of? <__main__.A instance at 0xb7f088ac>

but if I call from module_name import A and then call A or A() I get something to the effect of? <module_4.module_4 instance at 0xb7f0882c>

I was wondering if this would be a problem.

I have included the test_import.py file as well as 4 module files which it loads. Save the tes_import.py file to a folder, create another folder there, and save ONLY the 4 modules files to that new folder. In the code, update line 26 to reflect to path of the newly created directory

Thanks in advanced


Peyman

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From jeanmichel at sequans.com  Wed Mar 10 07:27:33 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Wed, 10 Mar 2010 13:27:33 +0100
Subject: Import problem
In-Reply-To: <4b957866$0$17135$426a34cc@news.free.fr>
References: <6630f859-b85d-4841-b1d5-2a563dca9cbb@q15g2000yqj.googlegroups.com>	<mailman.460.1268053858.23598.python-list@python.org>
	<4b957866$0$17135$426a34cc@news.free.fr>
Message-ID: <4B979035.60505@sequans.com>

News123 wrote:
> Jean-Michel Pichavant wrote:
>   
>> Johny wrote:
>>     
>>> I have this directory structure
>>>
>>> C:
>>>       \A
>>>          __init__.py
>>>          amodule.py
>>>
>>>          \B
>>>           __init__.py
>>>           bmodule.py
>>>
>>>            \D
>>>             __init__.py
>>>             dmodule.py
>>>
>>> and  I want to import  bmodule.py
>>> C:\>cd \
>>>
>>> C:\>python
>>> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
>>> (Intel)] on win
>>> 32
>>> Type "help", "copyright", "credits" or "license" for more information.
>>>  
>>>       
>>>>>> from A.B import  bmodule
>>>>>>         
>>>>>>             
>>> I am bmodule
>>>   C:\>
>>>
>>> so far so good. Now I would like to import bmodule but if the current
>>> directory is \D subdirectory.
>>>
>>> C:> cd \A\B\D
>>> C:\A\B\D>
>>> C:\A\B\D>python
>>> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
>>> (Intel)] on win
>>> 32
>>> Type "help", "copyright", "credits" or "license" for more information.
>>>  
>>>       
>>>>>> import sys
>>>>>> sys.path.append('C:\\A')
>>>>>> from A.B import bmodule
>>>>>>         
>>>>>>             
>>> Traceback (most recent call last):
>>>   File "<stdin>", line 1, in <module>
>>> ImportError: No module named A.B
>>>
>>> C:\>
>>>
>>> so I can not import a module from the parent directory? Or where did I
>>> make an error?
>>> Thanks for help
>>>
>>> L.
>>>   
>>>       
>> try
>>
>> import sys
>> sys.path.append('C:\\')
>> from A.B import bmodule
>>
>>     
> is there any 'automatic' way of finding the top level
> directory?basically the 'top level directory is the first directory
> going upwards, that doesn't contain a __init__.py file.
>   
what if some user has an __init__.py file the top level directory of 
your package ?
> of course you could do this 'manually' by
> doing:
>
> # assume, that this module is A.amodule
> import sys
> import os
>
> # I'd love to have a similiar automatic construct
> if __name__ == "__main__":
>     level = 1 # or function locating how far to go up before
>               # finding a dir, whcih does not contain a __init__.py
>     mydir = os.path.split(__file__)[0]
>     topdir = os.path.join( mydir,*(("..",)*level))
>     abstop = os.path.abspath(topdir)
>     sys.path.append(abstop)
>
> ## now you can import with the normal module paths
>
> import A.blo
> print "and I found blo",dir(A.blo)
>
>
> bye N
>
>
>
>   
You don't want to do that and you don't need it neither. That's what the 
env variable PYTHONPATH is for. set it correctly, install your package 
inside and everything works just fine (+standard). With a linux OS it 
easy to create smb links to point to any working directory. It should be 
possible on windows as well.

If your package is meant to be destributed, you may use setup.py

JM


From victorsubervi at gmail.com  Wed Mar 10 07:32:15 2010
From: victorsubervi at gmail.com (Victor Subervi)
Date: Wed, 10 Mar 2010 08:32:15 -0400
Subject: Interacting With Another Script
Message-ID: <4dc0cfea1003100432h2495ede1vf5e5bd75172ab5ea@mail.gmail.com>

Hi;
There's a program (vpopmail) that has commands which, when called, request
input ("email address", "password", etc.) from the command line. I would
like to build a TTW interface for my clients to use that interacts with
these commands. It's easy enough for me to get the information from a
script, but how do I input it when these functions keep requesting
information? I hope I've made myself clear :-}
TIA,
beno
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From ndbecker2 at gmail.com  Wed Mar 10 08:12:14 2010
From: ndbecker2 at gmail.com (Neal Becker)
Date: Wed, 10 Mar 2010 08:12:14 -0500
Subject: Can't define __call__ within __init__?
Message-ID: <hn85re$vj9$1@dough.gmane.org>

Want to switch __call__ behavior.  Why doesn't this work?  What is the 
correct way to write this?

class X (object):
    def __init__(self, i):
        if i == 0:
            def __call__ (self):
                return 0
        else:
            def __call_ (self):
                return 1


x = X(0)

x()
TypeError: 'X' object is not callable




From jeanmichel at sequans.com  Wed Mar 10 08:22:36 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Wed, 10 Mar 2010 14:22:36 +0100
Subject: Named loops for breaking
In-Reply-To: <6d6a35e8-f09c-4792-8abe-5a0dc24d214e@g28g2000yqh.googlegroups.com>
References: <6d6a35e8-f09c-4792-8abe-5a0dc24d214e@g28g2000yqh.googlegroups.com>
Message-ID: <4B979D1C.6090706@sequans.com>

Daniel Klein wrote:
> Hey,
>
> I did a little searching and couldn't really find much recent on this.
> The only thing I found was this:
>
> http://groups.google.com/group/comp.lang.python/browse_thread/thread/a696624c92b91181/5b7479fdc3362b83?lnk=gst&q=break+named+loop#5b7479fdc3362b83
>
> Basically I'm wondering if there are any plans to implemented named
> loops in Python, so I can tell a break command to break out of a
> specific loop in the case of nested loops. Currently I'm using boolean
> flag variables, but I find that very clumsy. I know this idea of
> breaking out of specific loops from javascript; I guess java does it
> too. It just seems a very Pythonian idea to me: clear, promotes code
> legibility, seems obvious.
>   
Strange that I've rarely been in need of such feature. Continues & 
breaks are mess-prone, adding an 'outter block' break feature would just 
increase the messing potential of such controls.
Just my opinion though.

Still there's a control that is able to break outter scopes : return.
So embed your loop in a function and you'll be able to break whenever 
you want.

JM


From simon at brunningonline.net  Wed Mar 10 08:27:31 2010
From: simon at brunningonline.net (Simon Brunning)
Date: Wed, 10 Mar 2010 13:27:31 +0000
Subject: Can't define __call__ within __init__?
In-Reply-To: <hn85re$vj9$1@dough.gmane.org>
References: <hn85re$vj9$1@dough.gmane.org>
Message-ID: <8c7f10c61003100527o7c7f9375ie662ce67ab78f1de@mail.gmail.com>

On 10 March 2010 13:12, Neal Becker <ndbecker2 at gmail.com> wrote:
> Want to switch __call__ behavior. ?Why doesn't this work? ?What is the
> correct way to write this?
>
> class X (object):
> ? ?def __init__(self, i):
> ? ? ? ?if i == 0:
> ? ? ? ? ? ?def __call__ (self):
> ? ? ? ? ? ? ? ?return 0
> ? ? ? ?else:
> ? ? ? ? ? ?def __call_ (self):
> ? ? ? ? ? ? ? ?return 1
>
>
> x = X(0)
>
> x()
> TypeError: 'X' object is not callable

__call__ is in the __init__ method's local namespace - you need to
bind it to the class's namespace instead:

        X.__call__ = __call__

But this probably isn't what you want either, since all instances of X
will share the same method.

What are you trying to do? In your simple example, you'd be much
better off with a single __call__ method. But you knew that.

-- 
Cheers,
Simon B.


From anfedorov at gmail.com  Wed Mar 10 08:31:14 2010
From: anfedorov at gmail.com (Andrey Fedorov)
Date: Wed, 10 Mar 2010 08:31:14 -0500
Subject: Down casting Python objects
In-Reply-To: <41B1429F-57E8-4F58-883E-03F20FA9A635@gmail.com>
References: <7659cab31003091326i6f3ab6bta3b8f5948ab7b0ff@mail.gmail.com> 
	<41B1429F-57E8-4F58-883E-03F20FA9A635@gmail.com>
Message-ID: <7659cab31003100531i51749f7er6f23ca0ef59cdddf@mail.gmail.com>

On Wed, Mar 10, 2010 at 12:24 AM, Rami Chowdhury <rami.chowdhury at gmail.com>
wrote:

> Could you tell us *why* you need to down-cast x? Explicit type-casting is
> usually unnecessary in Python...


Sure! It's related to the longer question I unwisely asked during PyCon [1]
(when no one had time to read it, I suppose).

I have a couple of different flavors of request objects which I'd like to
make conform to a single interface. So Request `x' come in, I determine
which kind of request I'm dealing with, and would like to "down-cast" it to
ARequest or BRequest, classes which will provide appropriate accessor
properties for the rest of the code to use.

An option clearly in line with Python's docs might be for `x' to be an
attribute of an ARequest instance, but that would complicate the code of
ARequest. What I'm looking for is a way of adding mix-in's at runtime, if
that makes sense.

Cheers,
Andrey

1. http://mail.python.org/pipermail/python-list/2010-February/1236681.html
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From breamoreboy at yahoo.co.uk  Wed Mar 10 08:40:19 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Wed, 10 Mar 2010 13:40:19 +0000
Subject: Can't define __call__ within __init__?
In-Reply-To: <hn85re$vj9$1@dough.gmane.org>
References: <hn85re$vj9$1@dough.gmane.org>
Message-ID: <hn87eh$6kh$1@dough.gmane.org>

Neal Becker wrote:
> Want to switch __call__ behavior.  Why doesn't this work?  What is the 
> correct way to write this?
> 
> class X (object):
>     def __init__(self, i):
>         if i == 0:
>             def __call__ (self):
>                 return 0
>         else:
>             def __call_ (self):
>                 return 1
> 
> 
> x = X(0)
> 
> x()
> TypeError: 'X' object is not callable
> 
> 
I think it's because X has already been constructed when __init__ is 
called, so __new__ is the place for your conditional code.



From ndbecker2 at gmail.com  Wed Mar 10 08:41:28 2010
From: ndbecker2 at gmail.com (Neal Becker)
Date: Wed, 10 Mar 2010 08:41:28 -0500
Subject: Can't define __call__ within __init__?
References: <hn85re$vj9$1@dough.gmane.org>
	<8c7f10c61003100527o7c7f9375ie662ce67ab78f1de@mail.gmail.com>
Message-ID: <hn87i9$6d3$1@dough.gmane.org>

Simon Brunning wrote:

> On 10 March 2010 13:12, Neal Becker <ndbecker2 at gmail.com> wrote:
>> Want to switch __call__ behavior.  Why doesn't this work?  What is the
>> correct way to write this?
>>
>> class X (object):
>> def __init__(self, i):
>> if i == 0:
>> def __call__ (self):
>> return 0
>> else:
>> def __call_ (self):
>> return 1
>>
>>
>> x = X(0)
>>
>> x()
>> TypeError: 'X' object is not callable
> 
> __call__ is in the __init__ method's local namespace - you need to
> bind it to the class's namespace instead:
> 
>         X.__call__ = __call__
> 
> But this probably isn't what you want either, since all instances of X
> will share the same method.
> 
> What are you trying to do? In your simple example, you'd be much
> better off with a single __call__ method. But you knew that.
> 

Sorry, a bit early in the morning.  This works:
class X (object):
    def __init__(self, i):
        if i == 0:
            def F (self):
                return 0
        else:
            def F (self):
                return 1
        self.F = F
        
    def __call__ (self):
        return self.F (self)
   

Not sure if there is a more elegant (or compact) way to write this.
Could __call__ be defined directly within __init__?

What I'm trying to do is make a callable whose behavior is switched based on 
some criteria that will be fixed for all calls.  In my example, this will 
ultimately be determined by the setting of a command line switch.



From martin.hellwig at dcuktec.org  Wed Mar 10 08:54:27 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Wed, 10 Mar 2010 13:54:27 +0000
Subject: Does this already exists?: A module that checks if the used platform
	is supported
Message-ID: <hn88ag$b5m$1@news.eternal-september.org>

Hi all,

Before I start reinventing a squared wheel, I have the following question:
Is there already a (standard) module that wraps around the various 
os/sys information which checks if the platform + version is supported 
for what I want to do with it.

For example I am currently looking at making a wrapper around sysctl, 
for Freebsd only (2.2 onwards perhaps later I add Linux if I feel up to it.

So yes of course I can do a os.uname() but it struck me that there must 
be a better way. *

If you think I made a thought error along the line and there is a better 
solution, please do tell me too :-)

Thanks,

-- 
mph

* Something like:
test = RequirePlatform(do_not_raise=True)
test.require(platform='freebsd', version_min='2.2')
# If the platform is anything else but FreeBSD 2.2+
# raise an EnvironmentError. Otherwise, store the
# result of the test (True/False).
# Result of the require (and any additional tests
# can be accessed using the index operators

if test[0]:
     print('supported')


From mnordhoff at mattnordhoff.com  Wed Mar 10 08:58:07 2010
From: mnordhoff at mattnordhoff.com (Matt Nordhoff)
Date: Wed, 10 Mar 2010 13:58:07 +0000
Subject: Can't define __call__ within __init__?
In-Reply-To: <hn87i9$6d3$1@dough.gmane.org>
References: <hn85re$vj9$1@dough.gmane.org>	<8c7f10c61003100527o7c7f9375ie662ce67ab78f1de@mail.gmail.com>
	<hn87i9$6d3$1@dough.gmane.org>
Message-ID: <4B97A56F.5060903@mattnordhoff.com>

Neal Becker wrote:
> Simon Brunning wrote:
> 
>> On 10 March 2010 13:12, Neal Becker <ndbecker2 at gmail.com> wrote:
>>> Want to switch __call__ behavior.  Why doesn't this work?  What is the
>>> correct way to write this?
>>>
>>> class X (object):
>>> def __init__(self, i):
>>> if i == 0:
>>> def __call__ (self):
>>> return 0
>>> else:
>>> def __call_ (self):
>>> return 1
>>>
>>>
>>> x = X(0)
>>>
>>> x()
>>> TypeError: 'X' object is not callable
>> __call__ is in the __init__ method's local namespace - you need to
>> bind it to the class's namespace instead:
>>
>>         X.__call__ = __call__
>>
>> But this probably isn't what you want either, since all instances of X
>> will share the same method.
>>
>> What are you trying to do? In your simple example, you'd be much
>> better off with a single __call__ method. But you knew that.
>>
> 
> Sorry, a bit early in the morning.  This works:
> class X (object):
>     def __init__(self, i):
>         if i == 0:
>             def F (self):
>                 return 0
>         else:
>             def F (self):
>                 return 1
>         self.F = F
>         
>     def __call__ (self):
>         return self.F (self)
>    
> 
> Not sure if there is a more elegant (or compact) way to write this.
> Could __call__ be defined directly within __init__?
> 
> What I'm trying to do is make a callable whose behavior is switched based on 
> some criteria that will be fixed for all calls.  In my example, this will 
> ultimately be determined by the setting of a command line switch.

ISTM it would be prettiest to do:

class X(object):
    def __init__(self, i):
        self.flag = i == 0
    def __call__(self):
        if self.flag:
            return 0
        else:
            return 1

Or, if the comparison isn't particularly expensive, it would look nicer
to just use self.i and do "self.i == 0" in __call__.

Not that it matters, but this is probably faster than your version, too,
since it saves a method call.

By the way, IIRC Python only looks up double-underscore methods on the
class, not the instance. That's why you had to indirect through self.F.
-- 
Matt Nordhoff


From jeanmichel at sequans.com  Wed Mar 10 09:07:57 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Wed, 10 Mar 2010 15:07:57 +0100
Subject: pexpect and logging integration
In-Reply-To: <4B972EA7.50807@telcotec.se>
References: <4B972EA7.50807@telcotec.se>
Message-ID: <4B97A7BD.6050003@sequans.com>

Lars Stavholm wrote:
> Hi all,
>
> has anyone managed to integrate pexpect and logging?
>
> I.e., I'd like to be able to pick up the dialog,
> commands sent and responses received, in my logging.
> I know about the pexpect logfile, and I can log things
> to stdout or stderr, but I really need to log using the
> python logging library.
>
> Any thoughts appreciated
> /Lars
>
>   
I had to implement this.
It's a bit of a hack, but it does the job.

The following code is tested with python 2.5, I remember pexpect behaves 
slightly differently in python 2.3.

import logging
import pexpect
import re

# this will be the method called by the pexpect object to log
def _write(*args, **kwargs):
    content = args[0]
    # let's ignore other params, pexpect only use one arg AFAIK
    if content in [' ', '', '\n', '\r', '\r\n']:
        return # don't log empty lines
    for eol in ['\r\n', '\r', '\n']:
        # remove ending EOL, the logger will add it anyway
        content = re.sub('\%s$' % eol, '', content)
    return logger.info(content) # call the logger info method with the 
reworked content


# our flush method
def _doNothing():
    pass

# get the logger
logger = logging.getLogger('foo')

# configure the logger
logger.handlers=[]
logger.addHandler(logging.StreamHandler())
logger.handlers[-1].setFormatter(logging.Formatter("%(asctime)s - 
%(name)s - %(levelname)s - %(message)s"))
logger.setLevel(logging.INFO)

# give the logger the methods required by pexpect
logger.write = _write
logger.flush = _doNothing

p = pexpect.spawn('echo "hello world !!"', logfile=logger)
p.expect('!!')

... 2010-03-10 15:01:31,234 - foo - INFO - hello world !!

Hope it helps.

JM



From jeanmichel at sequans.com  Wed Mar 10 09:10:10 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Wed, 10 Mar 2010 15:10:10 +0100
Subject: about Telnetlib problem
In-Reply-To: <46c1bcc21003100106s1db37a95ke928306c5e79d088@mail.gmail.com>
References: <46c1bcc21003100106s1db37a95ke928306c5e79d088@mail.gmail.com>
Message-ID: <4B97A842.4030709@sequans.com>

JEHERUL wrote:
> Dear All
>
> I am trying to telnet to a Cisco router . Following is my code .
>
> #code router.py
>
> import getpass
> import sys
> import telnetlib
>
> HOST = "router address"               # router address is ommitted for 
> security reason
> user = raw_input("Username : ")
> password = getpass.getpass()
>
> tn = telnetlib.Telnet(HOST)
>
> tn.read_until("Username: ")
> tn.write(user + "\n")
> tn.read_until("Password: ")
> tn.write(password + "\n")
>
>
> tn.read_until("I>")
> tn.write("sh int f0/0")
>
> print "Just to check"
>
>
> print tn.read_all()
>
> print "after read"
> tn.write("exit\n")
>
>
>
> But when I execute the program I got the following error .
>
>
> Traceback (most recent call last):
>   File "router.py", line 23, in ?
>     print tn.read_all()
>   File "/usr/lib/python2.4/telnetlib.py", line 330, in read_all
>     self.fill_rawq()
>   File "/usr/lib/python2.4/telnetlib.py", line 521, in fill_rawq
>     buf = self.sock.recv(50)
>
> Please help me .
>
> Regards
> -- 
> Jeherul Islam
> Indian Institute of Information Technology and Management .
> Gwalior (MP)
>
>
Hi,

Your error trace is incomplete it's missing the exception. It would be 
better if you provide it.

JM


From tjreedy at udel.edu  Wed Mar 10 09:21:12 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 10 Mar 2010 09:21:12 -0500
Subject: Knight's tour Warndorff's algorithm problem
In-Reply-To: <op.u9b68cuyx6zn5v@lepton.softlabbsas.com.ar>
References: <op.u9b68cuyx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <hn89sp$g5s$1@dough.gmane.org>

On 3/10/2010 12:37 AM, Gabriel Genellina wrote:

>> if (next != 0):
>> (self.y, self.x) = (next.y, next.x)

In Python3, next is a builtin function.
Choose a different name, at least in public code ;=).



From richardbp at gmail.com  Wed Mar 10 09:29:03 2010
From: richardbp at gmail.com (Richard)
Date: Wed, 10 Mar 2010 06:29:03 -0800 (PST)
Subject: os.rename [Errno 31] Too many links
Message-ID: <253f4908-1cb9-4165-bf01-1d89b39d3b35@k6g2000prg.googlegroups.com>

I want to atomically write to a file so have been using temporary
files and renaming:

temp = tempfile.NamedTemporaryFile(delete=False)
temp.file.write(data)
temp.file.close()
os.rename(temp.name, output_file)

This worked but after 39567 files os.rename raises an OSError: [Errno
31] Too many links

I can still create files in this directory so I doubt it is a platform
limitation.
Can you tell what is wrong? Am I not freeing the temporary file
resources properly?

thanks,
Richard




From tjreedy at udel.edu  Wed Mar 10 09:32:03 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 10 Mar 2010 09:32:03 -0500
Subject: Importing Modules
In-Reply-To: <676034.43316.qm@web30001.mail.mud.yahoo.com>
References: <676034.43316.qm@web30001.mail.mud.yahoo.com>
Message-ID: <hn8ah4$jbn$1@dough.gmane.org>

On 3/10/2010 7:19 AM, PEYMAN ASKARI wrote:
> Hello
>
> I frequent the PyGtk mailing list all the time, but this is the first
> time I am posting here =)
>
> I wanted to know if imported classes are treated differently than
> internal classes.
>
> I have attached a minimal example which points out what I mean.
> Essentially, if I create a class:
>
> class A():
> __init__(self):
> pass
>
> and call A, or A() I get something to the effect of <__main__.A instance
> at 0xb7f088ac>
>
> but if I call from module_name import A and then call A or A() I get
> something to the effect of <module_4.module_4 instance at 0xb7f0882c>
>
> I was wondering if this would be a problem.

Only if you code cares about A.__module__ (3.x, not sure of 2.x) and the 
string returned by str or repr, which nearly always, it should not.

tjr



From jjposner at optimum.net  Wed Mar 10 09:45:38 2010
From: jjposner at optimum.net (John Posner)
Date: Wed, 10 Mar 2010 09:45:38 -0500
Subject: Method / Functions - What are the differences?
In-Reply-To: <4b911ee0$0$4988$607ed4bc@cv.net>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
	<mailman.109.1267539415.23598.python-list@python.org>
	<hmk1mn$70u$1@newsreader3.netcologne.de>
	<4b8e4041$0$17447$426a34cc@news.free.fr> <hmlte9$d0f$1@dough.gmane.org>
	<mailman.205.1267633968.23598.python-list@python.org>
	<4b8e9660$0$21812$426a34cc@news.free.fr>
	<hmmrh4$644$1@newsreader3.netcologne.de> <4B8EF717.3070701@optimum.net>
	<4b902338$0$31260$607ed4bc@cv.net>
	<4b90f5eb$0$9148$426a74cc@news.free.fr>
	<4b911ee0$0$4988$607ed4bc@cv.net>
Message-ID: <4B97B092.4060901@optimum.net>

[ cross-posting to edu-sig ]

Bruno (and anyone else interested) --

As I promised/threatened, here's the *start* of a write-up on 
properties, aimed at non-advanced Python programmers:

   http://www.jjposner.net/media/python-properties-0310.pdf

I'm interested in corrections, of course. But I'm also interested in 
opinions as to whether this somewhat lengthy treatment is worth the 
effort -- does it improve on existing write-ups?

Tx,
John



From bringa at gmail.com  Wed Mar 10 10:15:47 2010
From: bringa at gmail.com (Daniel Klein)
Date: Wed, 10 Mar 2010 07:15:47 -0800 (PST)
Subject: Named loops for breaking
References: <6d6a35e8-f09c-4792-8abe-5a0dc24d214e@g28g2000yqh.googlegroups.com>
	<mailman.545.1268227366.23598.python-list@python.org>
Message-ID: <43248058-f388-4127-904a-e0c2e80a36e4@33g2000yqj.googlegroups.com>

Thanks for the link to the PEP. I should search through PEPs first
next time :)

Okay, I understand Guido's reasoning and yield the point. I typed up
the specific example in which I came across this problem and, while
doing so, realized there's a much better way of approaching the
problem, so thank you for that as well :)


From jpeck at fedex.com  Wed Mar 10 10:17:12 2010
From: jpeck at fedex.com (Jeff Peck)
Date: Wed, 10 Mar 2010 09:17:12 -0600
Subject: Bluetooth
In-Reply-To: <BD5B58B2-7774-4F42-90BC-5D0AF8CC82F7@rgbaz.eu>
References: <BD5B58B2-7774-4F42-90BC-5D0AF8CC82F7@rgbaz.eu>
Message-ID: <4B97B7F8.2030303@fedex.com>

On 3/7/2010 1:26 PM, PythonAB wrote:
> Hello,
>
>
> I'm writing a script that has to connect a bluetooth device
> with a 3D application.
> On my search for a bluetooth module i ran into this:
> http://www.python.org/download/releases/2.4/notes/
> where it says:
> "The socket module now supports Bluetooth sockets,
> if the system has <bluetooth/bluetooth.h>"
>
> Yet I can't find anything at all in the socket manuals
> nor anywhere else on the site...
>
> Does the socket module really support Bluetooth out of the box?
> I've used socket before but never read anything about bluetooth...
>
> Maybe I need to get the bluetooth.h file, but i have no idea what I
> am supposed to do with it...
>
> Can anyone shed some light on this for me please?
>
> thanks in advance,
>
> gr
> Arno

Have you come across the PyBluez library yet? I recently used it in a 
project and it worked very well.

Hth,
Jeff
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From no.email at please.post  Wed Mar 10 10:19:04 2010
From: no.email at please.post (kj)
Date: Wed, 10 Mar 2010 15:19:04 +0000 (UTC)
Subject: Anything like "Effective Java" for Python?
Message-ID: <hn8d98$m0d$1@reader1.panix.com>




Subject line pretty much says it all: is there a book like "Effective
Java" for Python.  I.e. a book that assumes that readers are
experienced programmers that already know the basics of the language,
and want to focus on more advanced programming issues?

~K


From simon at brunningonline.net  Wed Mar 10 10:29:44 2010
From: simon at brunningonline.net (Simon Brunning)
Date: Wed, 10 Mar 2010 15:29:44 +0000
Subject: Anything like "Effective Java" for Python?
In-Reply-To: <hn8d98$m0d$1@reader1.panix.com>
References: <hn8d98$m0d$1@reader1.panix.com>
Message-ID: <8c7f10c61003100729j2afba0c9rf00760e48f535249@mail.gmail.com>

On 10 March 2010 15:19, kj <no.email at please.post> wrote:
> Subject line pretty much says it all: is there a book like "Effective
> Java" for Python. ?I.e. a book that assumes that readers are
> experienced programmers that already know the basics of the language,
> and want to focus on more advanced programming issues?

<http://www.packtpub.com/expert-python-programming/book> is good.

-- 
Cheers,
Simon B.


From echerlin at gmail.com  Wed Mar 10 10:31:35 2010
From: echerlin at gmail.com (Edward Cherlin)
Date: Wed, 10 Mar 2010 10:31:35 -0500
Subject: [Edu-sig] Method / Functions - What are the differences?
In-Reply-To: <4B97B092.4060901@optimum.net>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<hmlte9$d0f$1@dough.gmane.org>
	<mailman.205.1267633968.23598.python-list@python.org>
	<4b8e9660$0$21812$426a34cc@news.free.fr>
	<hmmrh4$644$1@newsreader3.netcologne.de>
	<4B8EF717.3070701@optimum.net> <4b902338$0$31260$607ed4bc@cv.net>
	<4b90f5eb$0$9148$426a74cc@news.free.fr>
	<4b911ee0$0$4988$607ed4bc@cv.net> <4B97B092.4060901@optimum.net>
Message-ID: <e574f6eb1003100731u7e07f058lf86af48f991b1e0c@mail.gmail.com>

On Wed, Mar 10, 2010 at 09:45, John Posner <jjposner at optimum.net> wrote:
> [ cross-posting to edu-sig ]
>
> Bruno (and anyone else interested) --
>
> As I promised/threatened, here's the *start* of a write-up on properties,
> aimed at non-advanced Python programmers:
>
> ?http://www.jjposner.net/media/python-properties-0310.pdf
>
> I'm interested in corrections, of course. But I'm also interested in
> opinions as to whether this somewhat lengthy treatment is worth the effort
> -- does it improve on existing write-ups?

I find that it will explain things to those who already understand
most of the concepts. However, I felt as though I were being led
through a maze without knowing where we were headed. This suggests
that the concepts can be re-ordered in a manner that will help your
readers more, and then we can refactor further. (Yes, you can apply
Extreme Programming concepts to create Extreme Documentation,
including consultations with users, pair or group writing, frequent
refactoring, and more, as at FLOSSManuals.net.)

Who is your expected audience?

> Tx,
> John
>
> _______________________________________________
> Edu-sig mailing list
> Edu-sig at python.org
> http://mail.python.org/mailman/listinfo/edu-sig
>



-- 
Edward Mokurai (??/???????????????/????????????? ?) Cherlin
Silent Thunder is my name, and Children are my nation.
The Cosmos is my dwelling place, the Truth my destination.
http://www.earthtreasury.org/


From bsagert at gmail.com  Wed Mar 10 10:55:27 2010
From: bsagert at gmail.com (Bill)
Date: Wed, 10 Mar 2010 07:55:27 -0800 (PST)
Subject: I passed a fizzbuzz test but failed at recursion.
Message-ID: <2380120f-c273-4179-af80-ecc8954a6bd3@b7g2000yqd.googlegroups.com>

Look at this recursive fizzbuzz function from
http://www.codinghorror.com/blog/2007/02/why-cant-programmers-program.html

def fizzbuzz(num):
    if num:
        if num % 15 is 0: return fizzbuzz(num-1) + 'fizzbuzz \n'
        elif num % 5 is 0: return fizzbuzz(num-1) + 'buzz \n'
        elif num % 3 is 0: return fizzbuzz(num-1) + 'fizz \n'
        else : return fizzbuzz(num-1) + ('%d \n' % num)
    return ''
print fizzbuzz(100)

This returns "1 2 fizz 4 ...etc... 97 98 fizz buzz" which is correct.

However, when I try to decipher the logic of the function I imagine
the solution reversed as "buzz fizz 98 97 ...etc... 4 fizz 2 1".

After all, the first num is 100 which decrements by one until a zero
stops the recursive loop.

My (faulty) reasoning is that fizzbuzz(100) would firstly print a
"fizz" and  the last fizzbuzz(1) would finally print a "1".

My logic is wrong, but I don't know why.


From hv at tbz-pariv.de  Wed Mar 10 11:08:44 2010
From: hv at tbz-pariv.de (Thomas Guettler)
Date: Wed, 10 Mar 2010 17:08:44 +0100
Subject: os.rename [Errno 31] Too many links
In-Reply-To: <253f4908-1cb9-4165-bf01-1d89b39d3b35@k6g2000prg.googlegroups.com>
References: <253f4908-1cb9-4165-bf01-1d89b39d3b35@k6g2000prg.googlegroups.com>
Message-ID: <7vpugdF5bqU1@mid.individual.net>

Richard wrote:
> I want to atomically write to a file so have been using temporary
> files and renaming:
> 
> temp = tempfile.NamedTemporaryFile(delete=False)
> temp.file.write(data)
> temp.file.close()
> os.rename(temp.name, output_file)
> 
> This worked but after 39567 files os.rename raises an OSError: [Errno
> 31] Too many links
> 
> I can still create files in this directory so I doubt it is a platform
> limitation.
> Can you tell what is wrong? Am I not freeing the temporary file
> resources properly?

If you are on linux you can have a look at the open file descriptors of
a running process like this:

ls -l /proc/PID/fd/

But I guess it is a limitation of your filesystem. What do you use?

I once had this problem with ext2. It has a low limit for
subdirectories.

With xfs the limits are much greater.

  Thomas


-- 
Thomas Guettler, http://www.thomas-guettler.de/
E-Mail: guettli (*) thomas-guettler + de


From chris.hulan at gmail.com  Wed Mar 10 11:24:00 2010
From: chris.hulan at gmail.com (Chris Hulan)
Date: Wed, 10 Mar 2010 08:24:00 -0800 (PST)
Subject: I passed a fizzbuzz test but failed at recursion.
References: <2380120f-c273-4179-af80-ecc8954a6bd3@b7g2000yqd.googlegroups.com>
Message-ID: <749d9c6e-f41f-4859-9c57-459caeddf6e4@j27g2000yqn.googlegroups.com>

On Mar 10, 10:55?am, Bill <bsag... at gmail.com> wrote:
> Look at this recursive fizzbuzz function fromhttp://www.codinghorror.com/blog/2007/02/why-cant-programmers-program...
>
> def fizzbuzz(num):
> ? ? if num:
> ? ? ? ? if num % 15 is 0: return fizzbuzz(num-1) + 'fizzbuzz \n'
> ? ? ? ? elif num % 5 is 0: return fizzbuzz(num-1) + 'buzz \n'
> ? ? ? ? elif num % 3 is 0: return fizzbuzz(num-1) + 'fizz \n'
> ? ? ? ? else : return fizzbuzz(num-1) + ('%d \n' % num)
> ? ? return ''
> print fizzbuzz(100)
>
> This returns "1 2 fizz 4 ...etc... 97 98 fizz buzz" which is correct.
>
> However, when I try to decipher the logic of the function I imagine
> the solution reversed as "buzz fizz 98 97 ...etc... 4 fizz 2 1".
>
> After all, the first num is 100 which decrements by one until a zero
> stops the recursive loop.
>
> My (faulty) reasoning is that fizzbuzz(100) would firstly print a
> "fizz" and ?the last fizzbuzz(1) would finally print a "1".
>
> My logic is wrong, but I don't know why.

There's only one print, it prints the string returned by fizzbuzz(100)
The string is constructed via recursion
ie:
fizzbuzz(6)
 fizzbuzz(5)
  fizzbuzz(4)
   fizzbuzz(3)
    fizzbuzz(2)
     fizzbuzz(1)
      fizzbuzz(0)
     ''+'1 \n'
    '1 \n'+'2 \n'
   '1 \n2 \n'+'fizz \n'
  '1 \n2 \n fizz \n'+'4 \n'
 '1 \n2 \n fizz \n4 \n'+'buzz \n'
'1 \n2 \n fizz \n4 \nbuzz \n'+'fizz \n'

print '1 \n2 \n fizz \n4 \nbuzz \nfizz \n'

clear as mud ;)


From clp2 at rebertia.com  Wed Mar 10 11:31:06 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 10 Mar 2010 08:31:06 -0800
Subject: Interacting With Another Script
In-Reply-To: <4dc0cfea1003100432h2495ede1vf5e5bd75172ab5ea@mail.gmail.com>
References: <4dc0cfea1003100432h2495ede1vf5e5bd75172ab5ea@mail.gmail.com>
Message-ID: <50697b2c1003100831l302a84e2j1aeaf351dd4e1fe6@mail.gmail.com>

On Wed, Mar 10, 2010 at 4:32 AM, Victor Subervi <victorsubervi at gmail.com> wrote:
> Hi;
> There's a program (vpopmail) that has commands which, when called, request
> input ("email address", "password", etc.) from the command line. I would
> like to build a TTW interface for my clients to use that interacts with
> these commands. It's easy enough for me to get the information from a
> script, but how do I input it when these functions keep requesting
> information? I hope I've made myself clear :-}

(assuming TTW = Thru The Web; been a while since I've come across an
unknown, non-new acronym)

[Disclaimer: I know zilch about vpopmail's specifics]

Option A. Check for when the latest output looks prompt-like (e.g.
colon followed by a space; this will be program-specific and possibly
different for vpopmail) and then ask for input. For example:
1. Get new session request from client
2. Run new vpopmail process
3. Wait until prompt detected in process' output
4. Send back webpage with the output and a <form> to answer the prompt
5. Write user's response from form as input to process.
6. If read EOF, send final output back as webpage to client and close
session. Else, GOTO 3
(See also: expect)

Option B. Web pseudo-shell using AJAX. Client polls server for new
output. Client pushes new input to server at any time.
1. Get new session request from client
2. Run new vpopmail process
3. Send back webpage w/ JavaScript code
4.1. Client periodically polls server for new output via AJAX and
displays it when there is some.
4.2. Client has omnipresent <form> that on submission sends an AJAX
request to the server with the given input.
5. If get input message from client, write input to process' stdin. If
get polling message from client, do non-blocking read on the process'
output and respond with the result. If get EOF, inform client on next
poll and then close session.

Option C. The most user-friendly, and in some sense simplest, one.
Figure out the "conversation tree" vpopmail follows. Create a matching
form tree workflow, presenting multiple input fields at once. Run
vpopmail and write the appropriate input to its stdin based on the
form data. Send the output back as a webpage.

[Session management & timeouts in the preceding are left as exercises
for the implementor]

Option D. The Zen option: It seems quite probable that someone's
already written a web frontend for vpopmail
administration/configuration. Just use that. The best software is that
which you don't have to write.

Cheers,
Chris
--
Ironically, I have yet to code a webapp.
http://blog.rebertia.com


From clp2 at rebertia.com  Wed Mar 10 11:39:57 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 10 Mar 2010 08:39:57 -0800
Subject: Interacting With Another Script
In-Reply-To: <4dc0cfea1003100834g5d611cdcg63842d385f350fe7@mail.gmail.com>
References: <4dc0cfea1003100432h2495ede1vf5e5bd75172ab5ea@mail.gmail.com>
	<50697b2c1003100831l302a84e2j1aeaf351dd4e1fe6@mail.gmail.com>
	<4dc0cfea1003100834g5d611cdcg63842d385f350fe7@mail.gmail.com>
Message-ID: <50697b2c1003100839w5dc9a63fo5702ef1e842f40da@mail.gmail.com>

On Wed, Mar 10, 2010 at 8:34 AM, Victor Subervi <victorsubervi at gmail.com> wrote:
> On Wed, Mar 10, 2010 at 12:31 PM, Chris Rebert <clp2 at rebertia.com> wrote:
>> Option C. The most user-friendly, and in some sense simplest, one.
>> Figure out the "conversation tree" vpopmail follows. Create a matching
>> form tree workflow, presenting multiple input fields at once. Run
>> vpopmail and write the appropriate input to its stdin based on the
>> form data. Send the output back as a webpage.
>
> Yeah, that was my idea. But how does the program know when it's being
> prompted to enter data? That's my question ;)

There's no magical "prompt time". The process's stdin's openness to
writing is not conditional.
Just send it all the input at once with the proper newlines in place
and it should work just fine assuming the user input was valid
(barring vpopmail using some fancy terminal input malarkey like
curses).

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


From invalid at invalid.invalid  Wed Mar 10 11:44:29 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Wed, 10 Mar 2010 16:44:29 +0000 (UTC)
Subject: Interacting With Another Script
References: <4dc0cfea1003100432h2495ede1vf5e5bd75172ab5ea@mail.gmail.com>
	<50697b2c1003100831l302a84e2j1aeaf351dd4e1fe6@mail.gmail.com>
	<4dc0cfea1003100834g5d611cdcg63842d385f350fe7@mail.gmail.com>
	<mailman.560.1268239200.23598.python-list@python.org>
Message-ID: <hn8i9d$qeg$1@reader1.panix.com>

On 2010-03-10, Chris Rebert <clp2 at rebertia.com> wrote:
> On Wed, Mar 10, 2010 at 8:34 AM, Victor Subervi <victorsubervi at gmail.com> wrote:
>
>> Yeah, that was my idea. But how does the program know when it's being
>> prompted to enter data? That's my question ;)
>
> There's no magical "prompt time".

That depends on the program.  Some programs that prompt for input
(particulary username/password) flush stdin before displaying each
prompt.  I'm not saying the program in question does that...

> The process's stdin's openness to writing is not conditional.

That doesn't mean that data written prior to the prompt won't be
ignore.

> Just send it all the input at once with the proper newlines in place
> and it should work just fine assuming the user input was valid
> (barring vpopmail using some fancy terminal input malarkey like
> curses).

It's worth trying, but there's a slight chance it won't work.

-- 
Grant Edwards               grant.b.edwards        Yow! But they went to MARS
                                  at               around 1953!!
                              gmail.com            


From chris at simplistix.co.uk  Wed Mar 10 11:46:23 2010
From: chris at simplistix.co.uk (Chris Withers)
Date: Wed, 10 Mar 2010 16:46:23 +0000
Subject: Anything like "Effective Java" for Python?
In-Reply-To: <hn8d98$m0d$1@reader1.panix.com>
References: <hn8d98$m0d$1@reader1.panix.com>
Message-ID: <4B97CCDF.7070802@simplistix.co.uk>

kj wrote:
> 
> 
> Subject line pretty much says it all: is there a book like "Effective
> Java" 

oxymoronic, no?

Sorry, couldn't resist ;-)

Chris

-- 
Simplistix - Content Management, Batch Processing & Python Consulting
             - http://www.simplistix.co.uk


From krishna.k.0001 at gmail.com  Wed Mar 10 11:47:44 2010
From: krishna.k.0001 at gmail.com (Krishna K)
Date: Wed, 10 Mar 2010 08:47:44 -0800
Subject: Scalable python dict {'key_is_a_string': [count, some_val]}
In-Reply-To: <6cc20cea1002192327v364fd099r242b97a6316f6051@mail.gmail.com>
References: <4e44ed04-7175-470a-99cb-cf51a93ff5f4@k41g2000yqm.googlegroups.com>
	<6cc20cea1002192327v364fd099r242b97a6316f6051@mail.gmail.com>
Message-ID: <d0e634591003100847j981c934n8f1d4d329dfabb87@mail.gmail.com>

On Fri, Feb 19, 2010 at 11:27 PM, Jonathan Gardner <
jgardner at jonathangardner.net> wrote:

> On Fri, Feb 19, 2010 at 10:36 PM, krishna <krishna.k.0001 at gmail.com>
> wrote:
> > I have to manage a couple of dicts with huge dataset (larger than
> > feasible with the memory on my system), it basically has a key which
> > is a string (actually a tuple converted to a string) and a two item
> > list as value, with one element in the list being a count related to
> > the key. I have to at the end sort this dictionary by the count.
> >
> > The platform is linux. I am planning to implement it by setting a
> > threshold beyond which I write the data into files (3 columns: 'key
> > count some_val' ) and later merge those files (I plan to sort the
> > individual files by the key column and walk through the files with one
> > pointer per file and merge them; I would add up the counts when
> > entries from two files match by key) and sorting using the 'sort'
> > command. Thus the bottleneck is the 'sort' command.
> >
> > Any suggestions, comments?
> >
>
> You should be using BDBs or even something like PostgreSQL. The
> indexes there will give you the scalability you need. I doubt you will
> be able to write anything that will select, update, insert or delete
> data better than what BDBs and PostgreSQL can give you.
>
> --
> Jonathan Gardner
> jgardner at jonathangardner.net


Thank you. I tried BDB, it seems to get very very slow as you scale.

Thank you,
Krishna
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From phlip2005 at gmail.com  Wed Mar 10 11:54:51 2010
From: phlip2005 at gmail.com (Phlip)
Date: Wed, 10 Mar 2010 08:54:51 -0800 (PST)
Subject: equivalent of Ruby's Pathname?
References: <843d5af9-e8db-4352-a853-4c99664eadf8@k6g2000prg.googlegroups.com>
	<22ac2bce-cf12-45e2-9d89-d7df56a2faa7@b1g2000prc.googlegroups.com> 
	<dcace5fc-5ae9-4756-942d-6da7da2f660d@s36g2000prh.googlegroups.com> 
	<91770e62-2fef-45c9-9e4d-e64088058af1@g8g2000pri.googlegroups.com> 
	<7tceiuF94hU1@mid.individual.net>
	<d871b429-deff-4974-84f3-d5f19c6b9042@u15g2000prd.googlegroups.com>
	<hn6na6$2ci$1@news.eternal-september.org>
Message-ID: <aabee5b1-5c7d-4248-b096-99b5549c739a@o3g2000yqb.googlegroups.com>

Martin P. Hellwig wrote:

> Well even if this statement would be true, I personally think that not
> proclaiming something a 'standard' if you are sure that you are not sure
> about it, is a virtue.

In terms of trying too hard to achieve perfection, am I missing a
Python repository similar to the C++ Boost project? All the nice-to-
have classes that extend the core of C++ get to live in Boost before
the C++ Committee pulls the best ideas off the top and add them to the
Standard Library...

--
  Phlip
  http://penbird.tumblr.com/


From clp2 at rebertia.com  Wed Mar 10 12:15:07 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 10 Mar 2010 09:15:07 -0800
Subject: equivalent of Ruby's Pathname?
In-Reply-To: <aabee5b1-5c7d-4248-b096-99b5549c739a@o3g2000yqb.googlegroups.com>
References: <843d5af9-e8db-4352-a853-4c99664eadf8@k6g2000prg.googlegroups.com>
	<22ac2bce-cf12-45e2-9d89-d7df56a2faa7@b1g2000prc.googlegroups.com>
	<dcace5fc-5ae9-4756-942d-6da7da2f660d@s36g2000prh.googlegroups.com>
	<91770e62-2fef-45c9-9e4d-e64088058af1@g8g2000pri.googlegroups.com>
	<7tceiuF94hU1@mid.individual.net>
	<d871b429-deff-4974-84f3-d5f19c6b9042@u15g2000prd.googlegroups.com>
	<hn6na6$2ci$1@news.eternal-september.org>
	<aabee5b1-5c7d-4248-b096-99b5549c739a@o3g2000yqb.googlegroups.com>
Message-ID: <50697b2c1003100915u206aaef9n314503b3cb9d6187@mail.gmail.com>

On Wed, Mar 10, 2010 at 8:54 AM, Phlip <phlip2005 at gmail.com> wrote:
> Martin P. Hellwig wrote:
>> Well even if this statement would be true, I personally think that not
>> proclaiming something a 'standard' if you are sure that you are not sure
>> about it, is a virtue.
>
> In terms of trying too hard to achieve perfection, am I missing a
> Python repository similar to the C++ Boost project? All the nice-to-
> have classes that extend the core of C++ get to live in Boost before
> the C++ Committee pulls the best ideas off the top and add them to the
> Standard Library...

The next closest thing would probably be the Python Cookbook:
http://code.activestate.com/recipes/langs/python/

However, such stuff can also be found as third-party modules.

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


From duncan.booth at invalid.invalid  Wed Mar 10 12:26:46 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 10 Mar 2010 17:26:46 GMT
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<4b90a1f8$0$1629$742ec2ed@news.sonic.net>
	<0d381135-730a-45e4-9225-9ba2a29b77fe@k2g2000pro.googlegroups.com>
	<Xns9D35C3BFCE829duncanbooth@127.0.0.1>
	<13c167f4-5e37-48a0-a480-3494c212035c@k5g2000pra.googlegroups.com>
Message-ID: <Xns9D37B1793F70Aduncanbooth@127.0.0.1>

Xah Lee <xahlee at gmail.com> wrote:

> On Mar 8, 11:14??am, Duncan Booth <duncan.bo... at invalid.invalid>
> wrote: 
>> Xah Lee <xah... at gmail.com> wrote:
>> > For example, consider, if you are within world's top 100th user of
>> > database in terms of database size, such as Google, then it may be
>> > that the off-the-shelf tools may be limiting. But how many users
>> > really have such massive size of data?
>>
>> You've totally missed the point. It isn't the size of the data you
>> have today that matters, it's the size of data you could have in
>> several years 
> '
>> time.
> 
> so, you saying, in several years, we'd all become the world's top 100
> database users in terms of size, like Google?
> 
No, I'm saying that if you plan to build a business that could grow you 
should be clear up front how you plan to handle the growth. It's too late 
if you suddenly discover your platform isn't scalable just when you need to 
scale it.



From duncan.booth at invalid.invalid  Wed Mar 10 12:39:27 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 10 Mar 2010 17:39:27 GMT
Subject: Can't define __call__ within __init__?
References: <hn85re$vj9$1@dough.gmane.org>
	<8c7f10c61003100527o7c7f9375ie662ce67ab78f1de@mail.gmail.com>
	<mailman.549.1268228501.23598.python-list@python.org>
Message-ID: <Xns9D37B39F7893Bduncanbooth@127.0.0.1>

Neal Becker <ndbecker2 at gmail.com> wrote:

> What I'm trying to do is make a callable whose behavior is switched
> based on some criteria that will be fixed for all calls.  In my
> example, this will ultimately be determined by the setting of a
> command line switch. 
> 
If you want different behaviour its usually best to use different classes.

You can keep all the common behaviour in a base class and just override the 
__call__ method for the different behaviour. Then use a factory function to 
decide which class to instantiate or else override __new__ and make the 
decision there. e.g.

>>> class X(object):
	def __call__(self):
		return 0
	def __new__(cls, i):
		if i!=0:
			cls = Y
		return object.__new__(cls)

	
>>> class Y(X):
	def __call__(self):
		return 1

	
>>> x = X(0)
>>> x()
0
>>> y = X(1)
>>> y()
1
>>> isinstance(x, X)
True
>>> isinstance(y, X)
True

P.S. I don't know what you did in your post but your Followup-To header is 
pointing to a group on gmane which makes extra work for me replying. Please 
don't do that.


From dickinsm at gmail.com  Wed Mar 10 12:47:19 2010
From: dickinsm at gmail.com (Mark Dickinson)
Date: Wed, 10 Mar 2010 09:47:19 -0800 (PST)
Subject: Calculating very large exponents in python
References: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>
	<f3cc57c61003071240x18b580bend946824ef7955b6c@mail.gmail.com> 
	<COL110-W1236CED756D3C9374CB0A2B7350@phx.gbl>
	<mailman.466.1268075137.23598.python-list@python.org> 
	<90e5f42d-b0d0-4578-82ea-9d0e5770048b@k2g2000pro.googlegroups.com>
Message-ID: <a4cea7a1-7242-42fc-8050-84b9e2b59459@d2g2000yqa.googlegroups.com>

On Mar 9, 6:39?am, casevh <cas... at gmail.com> wrote:
> [also replying to Geremy since the OP's message doesn't appear...]
>
> On Mar 8, 11:05?am, geremy condra <debat... at gmail.com> wrote:
>
>
>
>
>
> > On Mon, Mar 8, 2010 at 2:15 AM, Fahad Ahmad <miracles... at hotmail.com> wrote:
> > > Thanks Geremy,
>
> > > That has been an absolute bump........... GOD i cant sit on my chair, it has
> > > worked even on 512 bit number and with no time..........
> > > superb i would say.
>
> > > lastly, i am using the code below to calculate Largest Prime factor of a
> > > number:
>
> > > print
> > > ('''======================================================================= ?========'''
> > > ?????? '''????????????? CALCULATE? HIGHEST PRIME
> > > FACTOR????????????????????????????????? '''
>
> > > '''======================================================================== ?=======''')
>
> > > #!/usr/bin/env python
> > > def highest_prime_factor(n):
> > > ?? if isprime(n):
> > > ????? return n
> > > ?? for x in xrange(2,n ** 0.5 + 1):
> > > ????? if not n % x:
> > > ???????? return highest_prime_factor(n/x)
> > > def isprime(n):
> > > ?? for x in xrange(2,n ** 0.5 + 1):
> > > ????? if not n % x:
> > > ???????? return False
> > > ?? return True
> > > if? __name__ == "__main__":
> > > ?? import time
> > > ?? start = time.time()
> > > ?? print highest_prime_factor(1238162376372637826)
> > > ?? print time.time() - start
>
> > > the code works with a bit of delay on the number : "1238162376372637826" but
> > > extending it to
> > > (10902610991329142436630551158108608965062811746392577675456004845499113044 ?30471090261099132914243663055115810860896506281174639257767545600484549911 3?0443047)
> > > ?makes python go crazy. Is there any way just like above, i can have it
> > > calculated it in no time.
>
> > > thanks for the support.
>
> > If you're just looking for the largest prime factor I would suggest using
> > a fermat factorization attack. In the example you gave, it returns
> > nearly immediately.
>
> > Geremy Condra- Hide quoted text -
>
> > - Show quoted text -
>
> For a Python-based solution, you might want to look at pyecm (http://
> sourceforge.net/projects/pyecm/)
>
> On a system with gmpy installed also, pyecm found the following
> factors:
>
> 101, 521, 3121, 9901, 36479, 300623, 53397071018461,
> 1900381976777332243781
>
> There still is a 98 digit unfactored composite:
>
> 602525071745682437589111511878284384468144476539868422797968232621651594065 00174226172705680274911
>
> Factoring this remaining composite using ECM may not be practical.
>
> casevh

The complete factorization is: 101 x 521 x 3121 x 9901 x 36479 x
300623 x 53397071018461 x 1900381976777332243781 x
6060517860310398033985611921721 x
9941808367425935774306988776021629111399536914790551022447994642391

It helps if you notice that the digits of the original 156-digit
number come from concatenating a 78-digit string to itself, giving an
immediate factor of 10**78 + 1.  (Oops.  Perhaps this was supposed to
be a secret back door to the OP's crypto scheme.  I've given it away
now. :))

--
Mark


From barry at python.org  Wed Mar 10 12:50:10 2010
From: barry at python.org (Barry Warsaw)
Date: Wed, 10 Mar 2010 12:50:10 -0500
Subject: Python 2.6.5 release candidate 2 now available
Message-ID: <20100310125010.415f838e@heresy.wooz.org>

Hi everyone,

The source tarballs and Windows installer for Python 2.6.5 release candidate 2
are now available:

http://www.python.org/download/releases/2.6.5/

As usual, please download, install, and test them with your favorite projects
and environments.  A number of regressions and build problems on OS X have
been fixed since rc1, and I'm really hoping we will not have to do an rc3.
I'm currently planning on releasing 2.6.5 final on March 19, 2010.

Enjoy,
-Barry

P.S. The Mac installer will hopefully be available soon.

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From dickinsm at gmail.com  Wed Mar 10 12:51:23 2010
From: dickinsm at gmail.com (Mark Dickinson)
Date: Wed, 10 Mar 2010 09:51:23 -0800 (PST)
Subject: Calculating very large exponents in python
References: <COL110-W10816BAC7087EE17EEB38BB7360@phx.gbl>
	<f3cc57c61003071240x18b580bend946824ef7955b6c@mail.gmail.com> 
	<COL110-W1236CED756D3C9374CB0A2B7350@phx.gbl>
	<mailman.466.1268075137.23598.python-list@python.org> 
	<90e5f42d-b0d0-4578-82ea-9d0e5770048b@k2g2000pro.googlegroups.com> 
	<e0a6a1a2-77b4-48ac-81aa-4f34b6130e06@u19g2000prh.googlegroups.com>
Message-ID: <9a244983-53ab-4ee5-a176-c67332337c96@15g2000yqi.googlegroups.com>

On Mar 9, 1:54?pm, casevh <cas... at gmail.com> wrote:
> After a few hours, the remaining factors are
>
> 6060517860310398033985611921721
>
> and
>
> 9941808367425935774306988776021629111399536914790551022447994642391
>
> casevh

Whoops---I missed this.  I'm too slow!  But at least my answers agree
with yours.  (Factoring 10**78+1 took around 7 seconds using GP/Pari
on a 2.5 GHz MacBook;  factoring the remaining quotient n / (10**78+1)
was much quicker.)

--
Mark


From tjreedy at udel.edu  Wed Mar 10 12:52:47 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 10 Mar 2010 12:52:47 -0500
Subject: I passed a fizzbuzz test but failed at recursion.
In-Reply-To: <2380120f-c273-4179-af80-ecc8954a6bd3@b7g2000yqd.googlegroups.com>
References: <2380120f-c273-4179-af80-ecc8954a6bd3@b7g2000yqd.googlegroups.com>
Message-ID: <hn8m9g$3rc$1@dough.gmane.org>

On 3/10/2010 10:55 AM, Bill wrote:
> Look at this recursive fizzbuzz function from
> http://www.codinghorror.com/blog/2007/02/why-cant-programmers-program.html
>
> def fizzbuzz(num):
>      if num:
>          if num % 15 is 0: return fizzbuzz(num-1) + 'fizzbuzz \n'
>          elif num % 5 is 0: return fizzbuzz(num-1) + 'buzz \n'
>          elif num % 3 is 0: return fizzbuzz(num-1) + 'fizz \n'

In all 3 branches, 'is' should be '=='. As written, this code depends on 
the implementation treating 0 as a singleton, which CPython does as an 
optimization, but which the language def does not require.

>          else : return fizzbuzz(num-1) + ('%d \n' % num)
>      return ''
> print fizzbuzz(100)
>
> This returns "1 2 fizz 4 ...etc... 97 98 fizz buzz" which is correct.
>
> However, when I try to decipher the logic of the function I imagine
> the solution reversed as "buzz fizz 98 97 ...etc... 4 fizz 2 1".
>
> After all, the first num is 100 which decrements by one until a zero
> stops the recursive loop.
>
> My (faulty) reasoning is that fizzbuzz(100) would firstly print a
> "fizz" and  the last fizzbuzz(1) would finally print a "1".

If one reversed the string addition in each branch, it would.
As written, the 'word' for n is tacked on at the end.

> My logic is wrong, but I don't know why.

Is this slightly revised version any clearer?

def fizzbuzz_rb(n):
     if n:
         previous = fizzbuzz_rb(n-1)
         word = (not n % 15 and 'fizzbuzz \n' or
                 not n % 5  and 'buzz \n' or
                 not n % 3  and 'fizz \n' or
                 '%d \n' % n)
         return previous + word
     else:
         return ''

or this equivalent tail-recursive version?

def fizzbuzz_rt(i,n,s):
     if i <= n:
         word = (not i % 15 and 'fizzbuzz \n' or
                 not i % 5  and 'buzz \n' or
                 not i % 3  and 'fizz \n' or
                '%d \n' % i)
         return fizzbuzz_rt(i+1, n, s+word)
     else:
         return s

or this equivalent iterative version?

def fizzbuzz_it(n):
     s = ''
     for i in range(1,n+1):
         s += (not i % 15 and 'fizzbuzz \n' or
               not i % 5  and 'buzz \n' or
               not i % 3  and 'fizz \n' or
                '%d \n' % i)
     return s

print (fizzbuzz_rb(100) == fizzbuzz_rt(1,100,'') == fizzbuzz_it(100))
# prints True

Terry Jan Reedy



From ndbecker2 at gmail.com  Wed Mar 10 13:23:02 2010
From: ndbecker2 at gmail.com (Neal Becker)
Date: Wed, 10 Mar 2010 13:23:02 -0500
Subject: Can't define __call__ within __init__?
References: <hn85re$vj9$1@dough.gmane.org>
	<8c7f10c61003100527o7c7f9375ie662ce67ab78f1de@mail.gmail.com>
	<mailman.549.1268228501.23598.python-list@python.org>
	<Xns9D37B39F7893Bduncanbooth@127.0.0.1>
Message-ID: <hn8o26$aik$1@dough.gmane.org>

Duncan Booth wrote:
...
> 
> P.S. I don't know what you did in your post but your Followup-To header is
> pointing to a group on gmane which makes extra work for me replying.
> Please don't do that.

I'm sorry about that, there is some bad interaction between gmane's nntp-
smtp gateway and python's mail list.  I don't know what to do about it.  I 
think the problem only happens on python's mail list (I've never seen it 
reported on any of the MANY other lists I use via gmane).



From duncan.booth at invalid.invalid  Wed Mar 10 13:37:59 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 10 Mar 2010 18:37:59 GMT
Subject: Can't define __call__ within __init__?
References: <hn85re$vj9$1@dough.gmane.org>
	<8c7f10c61003100527o7c7f9375ie662ce67ab78f1de@mail.gmail.com>
	<mailman.549.1268228501.23598.python-list@python.org>
	<Xns9D37B39F7893Bduncanbooth@127.0.0.1>
	<mailman.567.1268245398.23598.python-list@python.org>
Message-ID: <Xns9D37BCD4B883Bduncanbooth@127.0.0.1>

Neal Becker <ndbecker2 at gmail.com> wrote:

> Duncan Booth wrote:
> ...
>> 
>> P.S. I don't know what you did in your post but your Followup-To
>> header is pointing to a group on gmane which makes extra work for me
>> replying. Please don't do that.
> 
> I'm sorry about that, there is some bad interaction between gmane's
> nntp- smtp gateway and python's mail list.  I don't know what to do
> about it.  I think the problem only happens on python's mail list
> (I've never seen it reported on any of the MANY other lists I use via
> gmane). 
> 
Are the other mailing lists gatewayed from Usenet? It may not matter if 
there's a followup-to header on a mailing list, it probably just gets 
ignored, but it does matter on Usenet (which after all is what Gmane is 
emulating).


From debatem1 at gmail.com  Wed Mar 10 13:49:59 2010
From: debatem1 at gmail.com (geremy condra)
Date: Wed, 10 Mar 2010 13:49:59 -0500
Subject: Scalable python dict {'key_is_a_string': [count, some_val]}
In-Reply-To: <d0e634591003100847j981c934n8f1d4d329dfabb87@mail.gmail.com>
References: <4e44ed04-7175-470a-99cb-cf51a93ff5f4@k41g2000yqm.googlegroups.com>
	<6cc20cea1002192327v364fd099r242b97a6316f6051@mail.gmail.com>
	<d0e634591003100847j981c934n8f1d4d329dfabb87@mail.gmail.com>
Message-ID: <f3cc57c61003101049s3d7e76d7me28f594be2d1a6ac@mail.gmail.com>

On Wed, Mar 10, 2010 at 11:47 AM, Krishna K <krishna.k.0001 at gmail.com> wrote:
>
>
> On Fri, Feb 19, 2010 at 11:27 PM, Jonathan Gardner
> <jgardner at jonathangardner.net> wrote:
>>
>> On Fri, Feb 19, 2010 at 10:36 PM, krishna <krishna.k.0001 at gmail.com>
>> wrote:
>> > I have to manage a couple of dicts with huge dataset (larger than
>> > feasible with the memory on my system), it basically has a key which
>> > is a string (actually a tuple converted to a string) and a two item
>> > list as value, with one element in the list being a count related to
>> > the key. I have to at the end sort this dictionary by the count.
>> >
>> > The platform is linux. I am planning to implement it by setting a
>> > threshold beyond which I write the data into files (3 columns: 'key
>> > count some_val' ) and later merge those files (I plan to sort the
>> > individual files by the key column and walk through the files with one
>> > pointer per file and merge them; I would add up the counts when
>> > entries from two files match by key) and sorting using the 'sort'
>> > command. Thus the bottleneck is the 'sort' command.
>> >
>> > Any suggestions, comments?
>> >
>>
>> You should be using BDBs or even something like PostgreSQL. The
>> indexes there will give you the scalability you need. I doubt you will
>> be able to write anything that will select, update, insert or delete
>> data better than what BDBs and PostgreSQL can give you.
>>
>> --
>> Jonathan Gardner
>> jgardner at jonathangardner.net
>
> Thank you. I tried BDB, it seems to get very very slow as you scale.
>
> Thank you,
> Krishna

Have you tried any of the big key-value store systems, like couchdb etc?

Geremy Condra


From mrkafk at gmail.com  Wed Mar 10 13:58:07 2010
From: mrkafk at gmail.com (mk)
Date: Wed, 10 Mar 2010 19:58:07 +0100
Subject: Text mining in Python
Message-ID: <hn8q40$ip1$1@dough.gmane.org>

Hello everyone,

I need to do the following:

(0. transform words in a document into word roots)

1. analyze a set of documents to see which words are highly frequent

2. detect clusters of those highly frequent words

3. map the clusters to some "special" keywords

4. rank the documents on clusters and "top n" most frequent words

5. provide search that would rank documents according to whether search 
words were "special" cluster keywords or frequent words

Is there some good open source engine out there that would be suitable 
to the task at hand? Anybody has experience with them?

Now, I do now about NLTK and Python bindings to UIMA. The thing is, I do 
not know if those are good for the above task. If somebody has 
experience with those or other and would be able to say if they're good 
for this, please post.

Regards,
mk



From robert.kern at gmail.com  Wed Mar 10 14:05:38 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 10 Mar 2010 13:05:38 -0600
Subject: Text mining in Python
In-Reply-To: <hn8q40$ip1$1@dough.gmane.org>
References: <hn8q40$ip1$1@dough.gmane.org>
Message-ID: <hn8qi2$jo2$1@dough.gmane.org>

On 2010-03-10 12:58 PM, mk wrote:
> Hello everyone,
>
> I need to do the following:
>
> (0. transform words in a document into word roots)
>
> 1. analyze a set of documents to see which words are highly frequent
>
> 2. detect clusters of those highly frequent words
>
> 3. map the clusters to some "special" keywords
>
> 4. rank the documents on clusters and "top n" most frequent words
>
> 5. provide search that would rank documents according to whether search
> words were "special" cluster keywords or frequent words
>
> Is there some good open source engine out there that would be suitable
> to the task at hand? Anybody has experience with them?

You can probably do most of this with Whoosh:

   http://whoosh.ca/

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From steve at holdenweb.com  Wed Mar 10 14:06:05 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 10 Mar 2010 14:06:05 -0500
Subject: Down casting Python objects
In-Reply-To: <7659cab31003100531i51749f7er6f23ca0ef59cdddf@mail.gmail.com>
References: <7659cab31003091326i6f3ab6bta3b8f5948ab7b0ff@mail.gmail.com>
	<41B1429F-57E8-4F58-883E-03F20FA9A635@gmail.com>
	<7659cab31003100531i51749f7er6f23ca0ef59cdddf@mail.gmail.com>
Message-ID: <hn8qju$j26$1@dough.gmane.org>

Andrey Fedorov wrote:
> On Wed, Mar 10, 2010 at 12:24 AM, Rami Chowdhury
> <rami.chowdhury at gmail.com <mailto:rami.chowdhury at gmail.com>> wrote:
> 
>     Could you tell us *why* you need to down-cast x? Explicit
>     type-casting is usually unnecessary in Python...
> 
> 
> Sure! It's related to the longer question I unwisely asked during PyCon
> [1] (when no one had time to read it, I suppose).
> 
> I have a couple of different flavors of request objects which I'd like
> to make conform to a single interface. So Request `x' come in, I
> determine which kind of request I'm dealing with, and would like to
> "down-cast" it to ARequest or BRequest, classes which will provide
> appropriate accessor properties for the rest of the code to use.
> 
> An option clearly in line with Python's docs might be for `x' to be an
> attribute of an ARequest instance, but that would complicate the code of
> ARequest. What I'm looking for is a way of adding mix-in's at runtime,
> if that makes sense.
> 
The technique you need is not inheritance (which you are really trying
to abuse here, IMHO) but delegation.

Since all requests start out as of the same type, why not just give each
request a handler attribute and set it to a BarHandler or FooHandler
instance as appropriate. Then your generic code can call the handler's
methods, obtaining Foo- or Bar-style behavior as appropriate. If the
handler needs to manipulate the request object then the request object
can pass itself in as a method argument.

Technically your requests are delegating the handling to a subsidiary
object which implements the correct behavior for the request type.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From tack at urandom.ca  Wed Mar 10 14:31:56 2010
From: tack at urandom.ca (Jason Tackaberry)
Date: Wed, 10 Mar 2010 14:31:56 -0500
Subject: Text mining in Python
In-Reply-To: <hn8q40$ip1$1@dough.gmane.org>
References: <hn8q40$ip1$1@dough.gmane.org>
Message-ID: <1268249516.5238.779.camel@arrakis>

On Wed, 2010-03-10 at 19:58 +0100, mk wrote:
> I need to do the following:
[...]
> Is there some good open source engine out there that would be suitable 
> to the task at hand? Anybody has experience with them?

It sounds like a full text search engine might do a bit more than you
need, but based on what you described, should also be sufficient.

I highly recommend Xapian (xapian.org).  It has feature-complete Python
bindings, it's very well designed, and its performance is fantastic.
Xapian supports stemmers for most major languages (except for Asian
languages, unfortunately).

Cheers,
Jason.



From ndbecker2 at gmail.com  Wed Mar 10 14:42:39 2010
From: ndbecker2 at gmail.com (Neal Becker)
Date: Wed, 10 Mar 2010 14:42:39 -0500
Subject: Can't define __call__ within __init__?
References: <hn85re$vj9$1@dough.gmane.org>
	<8c7f10c61003100527o7c7f9375ie662ce67ab78f1de@mail.gmail.com>
	<mailman.549.1268228501.23598.python-list@python.org>
	<Xns9D37B39F7893Bduncanbooth@127.0.0.1>
	<mailman.567.1268245398.23598.python-list@python.org>
	<Xns9D37BCD4B883Bduncanbooth@127.0.0.1>
Message-ID: <hn8snf$sn8$1@dough.gmane.org>

Duncan Booth wrote:

> Neal Becker <ndbecker2 at gmail.com> wrote:
> 
>> Duncan Booth wrote:
>> ...
>>> 
>>> P.S. I don't know what you did in your post but your Followup-To
>>> header is pointing to a group on gmane which makes extra work for me
>>> replying. Please don't do that.
>> 
>> I'm sorry about that, there is some bad interaction between gmane's
>> nntp- smtp gateway and python's mail list.  I don't know what to do
>> about it.  I think the problem only happens on python's mail list
>> (I've never seen it reported on any of the MANY other lists I use via
>> gmane).
>> 
> Are the other mailing lists gatewayed from Usenet? It may not matter if
> there's a followup-to header on a mailing list, it probably just gets
> ignored, but it does matter on Usenet (which after all is what Gmane is
> emulating).

For the record, it isn't really gatewayed to usenet - it's just allowing you 
to read your favorite ML via nntp - which is MUCH more sensible than 
actually having all that mail delivered personally to you, if you read a lot 
of lists.



From jcb at iteris.com  Wed Mar 10 15:03:35 2010
From: jcb at iteris.com (Metalone)
Date: Wed, 10 Mar 2010 12:03:35 -0800 (PST)
Subject: file seek is slow
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>
	<daf5c75e-8139-4a4a-8c27-5cef00327bb1@o3g2000yqb.googlegroups.com>
Message-ID: <d86f1068-8cd4-4489-af00-450d407baf41@g28g2000prb.googlegroups.com>

f1_seek = f1.seek did not change the performance at all.
As it turns out each call is only
646 nanoseconds slower than 'C'.
However, that is still 80% of the time to perform a file seek,
which I would think is a relatively slow operation compared to just
making a system call.


From jcb at iteris.com  Wed Mar 10 15:04:28 2010
From: jcb at iteris.com (Metalone)
Date: Wed, 10 Mar 2010 12:04:28 -0800 (PST)
Subject: file seek is slow
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>
	<iogep59cp5756f63cpqq9dk7m90hdjht6c@4ax.com>
Message-ID: <b8486ec6-47a1-4358-9d16-fc51973ccc76@s25g2000prd.googlegroups.com>

Thanks, Tim.
Good to know.


From robert.kern at gmail.com  Wed Mar 10 15:06:34 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 10 Mar 2010 14:06:34 -0600
Subject: Can't define __call__ within __init__?
In-Reply-To: <hn8snf$sn8$1@dough.gmane.org>
References: <hn85re$vj9$1@dough.gmane.org>	<8c7f10c61003100527o7c7f9375ie662ce67ab78f1de@mail.gmail.com>	<mailman.549.1268228501.23598.python-list@python.org>	<Xns9D37B39F7893Bduncanbooth@127.0.0.1>	<mailman.567.1268245398.23598.python-list@python.org>	<Xns9D37BCD4B883Bduncanbooth@127.0.0.1>
	<hn8snf$sn8$1@dough.gmane.org>
Message-ID: <hn8u4a$2r0$1@dough.gmane.org>

On 2010-03-10 13:42 PM, Neal Becker wrote:
> Duncan Booth wrote:
>
>> Neal Becker<ndbecker2 at gmail.com>  wrote:
>>
>>> Duncan Booth wrote:
>>> ...
>>>>
>>>> P.S. I don't know what you did in your post but your Followup-To
>>>> header is pointing to a group on gmane which makes extra work for me
>>>> replying. Please don't do that.
>>>
>>> I'm sorry about that, there is some bad interaction between gmane's
>>> nntp- smtp gateway and python's mail list.  I don't know what to do
>>> about it.  I think the problem only happens on python's mail list
>>> (I've never seen it reported on any of the MANY other lists I use via
>>> gmane).
>>>
>> Are the other mailing lists gatewayed from Usenet? It may not matter if
>> there's a followup-to header on a mailing list, it probably just gets
>> ignored, but it does matter on Usenet (which after all is what Gmane is
>> emulating).
>
> For the record, it isn't really gatewayed to usenet - it's just allowing you
> to read your favorite ML via nntp - which is MUCH more sensible than
> actually having all that mail delivered personally to you, if you read a lot
> of lists.

python-list is also gatewayed to the real USENET group comp.lang.python in 
addition to its GMane gateway. Duncan is reading comp.lang.python from a real 
USENET server, not via python-list through his email client. Most of the other 
lists you read via GMane aren't gatewayed to the real USENET, so your 
Followup-To header never caused a problem for anyone else.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From robert.kern at gmail.com  Wed Mar 10 15:08:38 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 10 Mar 2010 14:08:38 -0600
Subject: Can't define __call__ within __init__?
In-Reply-To: <hn8o26$aik$1@dough.gmane.org>
References: <hn85re$vj9$1@dough.gmane.org>	<8c7f10c61003100527o7c7f9375ie662ce67ab78f1de@mail.gmail.com>	<mailman.549.1268228501.23598.python-list@python.org>	<Xns9D37B39F7893Bduncanbooth@127.0.0.1>
	<hn8o26$aik$1@dough.gmane.org>
Message-ID: <hn8u86$2r0$2@dough.gmane.org>

On 2010-03-10 12:23 PM, Neal Becker wrote:
> Duncan Booth wrote:
> ...
>>
>> P.S. I don't know what you did in your post but your Followup-To header is
>> pointing to a group on gmane which makes extra work for me replying.
>> Please don't do that.
>
> I'm sorry about that, there is some bad interaction between gmane's nntp-
> smtp gateway and python's mail list.  I don't know what to do about it.  I
> think the problem only happens on python's mail list (I've never seen it
> reported on any of the MANY other lists I use via gmane).

I think it may be your news reader adding the Original-Followup-To header. I use 
Thunderbird 3 to read this list via GMane, too, but my posts do not contain the 
header. What newsreader are you using?

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From lacrima.maxim at gmail.com  Wed Mar 10 15:16:25 2010
From: lacrima.maxim at gmail.com (Lacrima)
Date: Wed, 10 Mar 2010 12:16:25 -0800 (PST)
Subject: Can't install ssl for Python2.5
Message-ID: <3c0d84fc-1975-4937-9b65-88535e699999@u9g2000yqb.googlegroups.com>

Hello!

I use Ubuntu 9.10 Karmic Koala. It has Python 2.6 as default
installation.
And I installed Python 2.5 alongside (for the need of Google
AppEngine). But it seems like my Python 2.5 installation lacks ssl
support. I can't import ssl and starting appengine server fails with
"'module' object has no attribute 'HTTPSHandler'".
So I tried to install this: http://pypi.python.org/pypi/ssl/1.15
But it failed with a very strange error:
sudo easy_install-2.5 ssl
-------------
Searching for ssl
Reading http://pypi.python.org/simple/ssl/
Reading http://docs.python.org/dev/library/ssl.html
Best match: ssl 1.15
Downloading http://pypi.python.org/packages/source/s/ssl/ssl-1.15.tar.gz#md5=81ea8a1175e437b4c769ae65b3290e0c
Processing ssl-1.15.tar.gz
Running ssl-1.15/setup.py -q bdist_egg --dist-dir /tmp/easy_install-
Kd839q/ssl-1.15/egg-dist-tmp-QCIl6J
looking for /usr/include/openssl/ssl.h
looking for /usr/local/ssl/include/openssl/ssl.h
looking for /usr/include/krb5.h
looking for /usr/kerberos/include/krb5.h
error: Setup script exited with error: SandboxViolation: open('/usr/
local/lib/python2.5/test/test_ssl.py', 'wb') {}

The package setup script has attempted to modify files on your system
that are not within the EasyInstall build area, and has been aborted.

This package cannot be safely installed by EasyInstall, and may not
support alternate installation locations even if you run its setup
script by hand.  Please inform the package's author and the
EasyInstall
maintainers to find out if a fix or workaround is available.
-------------

I don't know how to solve this problem and I am looking forward for
help.
Thanks in advance.

with regards,
Maxim.


From mail at hellmutweber.de  Wed Mar 10 16:23:18 2010
From: mail at hellmutweber.de (Hellmut Weber)
Date: Wed, 10 Mar 2010 22:23:18 +0100
Subject: logging: local functions ==> loss of lineno
Message-ID: <4B980DC6.4050807@hellmutweber.de>

Hi Vinay Sajip,
I'm very glad discoverd your logging module ;-)
(That's what I would have liked 25 years ago when I was working as a 
technical software developper!)

Now I'm writing just some personal tools, I like python and want to use 
logging on a regular basis.

Logging works very well giving the filename and line number of the point 
where it is called. As long as I use the loggers directly.
BUT when I have to wrap the logger call in some other function, I always 
get file name and line number of the call of the logger inside the 
wrapping function.

Is there a possibility to get this information in this situation too?

TIA

Hellmut

-- 
Dr. Hellmut Weber         mail at hellmutweber.de
Degenfeldstra?e 2         tel   +49-89-3081172
D-80803 M?nchen-Schwabing mobil +49-172-8450321
please: No DOCs, no PPTs. why: tinyurl.com/cbgq



From martin at v.loewis.de  Wed Mar 10 16:23:38 2010
From: martin at v.loewis.de (Martin v. Loewis)
Date: Wed, 10 Mar 2010 22:23:38 +0100
Subject: Can't install ssl for Python2.5
In-Reply-To: <3c0d84fc-1975-4937-9b65-88535e699999@u9g2000yqb.googlegroups.com>
References: <3c0d84fc-1975-4937-9b65-88535e699999@u9g2000yqb.googlegroups.com>
Message-ID: <hn92kq$fgb$1@online.de>

> I don't know how to solve this problem and I am looking forward for
> help.

Try running "python setup.py install" directly, after downloading and
unpacking the package.

Regards,
Martin


From ldo at geek-central.gen.new_zealand  Wed Mar 10 16:49:51 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Thu, 11 Mar 2010 10:49:51 +1300
Subject: Knight's tour Warndorff's algorithm problem
References: <mailman.527.1268199449.23598.python-list@python.org>
Message-ID: <hn945v$3me$4@lust.ihug.co.nz>

In message <mailman.527.1268199449.23598.python-list at python.org>, Gabriel 
Genellina wrote:

> Warnsdorff's algorithm is heuristic ...

Then it shouldn?t be called an ?algorithm?.


From dreadpiratejeff at gmail.com  Wed Mar 10 16:52:28 2010
From: dreadpiratejeff at gmail.com (J)
Date: Wed, 10 Mar 2010 16:52:28 -0500
Subject: Ideas for creating processes
Message-ID: <36dec4ff1003101352g7d159742j2a0c76a6b0cd23fb@mail.gmail.com>

I'm working on a project and thought I'd ask for a suggestion on how
to proceed (I've got my own ideas, but I wanted to see if I was on the
right track)

For now, I've got this:

def main():
## get our list of directories to refresh
    releases=sys.argv[1:]
    if len(releases) < 1:
        print "You need to provide at least one dir to update"
        sys.exit()

    ## Lets figure out what there is to update
    updateDirs = []
    for rel in releases:
        currentDir = os.path.join(homedir, rel)
        for item in os.listdir(currentDir):
            updateDirs += [os.path.join(homedir, rel, item)]

which returns a list of full pathnames to directories that need to be
updated (updates will be carried out by calling rsync or zsync
eventually)

The directory hierarchy looks like this:

/home/user/files
/home/user/files/version1
/home/user/files/version1/type1
/home/user/files/version1/type2
/home/user/files/version2
/home/user/files/version2/type1

and the list ends up looking like this:

['/home/user/files/version1/type1','/home/user/files/version1/type2','/home/user/files/version2/type1','/home/user/files/version2/type2']

the next thing I need to do is figure out how to update those.

the quick and dirty would be (as I'm imagining it at the moment):
for path in pathlist:
    chdir into path
    execute rsync or zsync

but that gets me moving into one dir, updating, then moving into another.

What I was wondering about though, is spawning off separate rsync
processes to run concurrently (each rsync will hit a different remote
dir for each local dir)

so I'm trying to figure out a good way to do this:

for path in pathlist:
    kick off an individual rsync|zsync process to update path

wait for all child processes to end
exit program.

I've been looking at subprocess because at the moment, that's all I
really know...
But is there a better way of kicking off multiple simultaneous
processes so I can update all dirs at once instead of one at a time?

No, this isn't homework, it's something I'm working on to sync a
couple directories of ISO images to grab nightly builds
Yes, there are plenty of pre-made scripts out there, but I don't want
to even look at those because I figured this would be a good learning
experience, and I want to try to solve this as much on my own as I can
without just cut and pasting from someone elses program.

So, with that said, any ideas on the best way to proceed?  I'm going
to start looking at ways to use subprocess to do this, or would there
be a better way (multi-threading maybe?)

Or am I even in the right ballpark?

Cheers
Jeff


From james.harris.1 at googlemail.com  Wed Mar 10 16:53:34 2010
From: james.harris.1 at googlemail.com (James Harris)
Date: Wed, 10 Mar 2010 13:53:34 -0800 (PST)
Subject: Named loops for breaking
References: <6d6a35e8-f09c-4792-8abe-5a0dc24d214e@g28g2000yqh.googlegroups.com>
	<mailman.529.1268202554.23598.python-list@python.org>
Message-ID: <c809ceee-34ff-409c-b645-3cb833ce6f8a@g19g2000yqe.googlegroups.com>

On 10 Mar, 06:29, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
> En Tue, 09 Mar 2010 18:41:10 -0300, Daniel Klein <bri... at gmail.com> ?
> escribi :
>
> > Basically I'm wondering if there are any plans to implemented named
> > loops in Python, so I can tell a break command to break out of a
> > specific loop in the case of nested loops.
>
> See PEP3136 [1] and its rejection note [2]
> I think you may find some more discussion in the python-ideas list.
>
> > Currently I'm using boolean
> > flag variables, but I find that very clumsy. I know this idea of
> > breaking out of specific loops from javascript; I guess java does it
> > too. It just seems a very Pythonian idea to me: clear, promotes code
> > legibility, seems obvious.
>
> Although I've occasionally missed the feature myself, I agree with Guido's ?
> arguments against it.

I don't agree with Guido's second reason in particular. He writes in
the link Gabriel provided

  > [2]http://mail.python.org/pipermail/python-3000/2007-July/
008663.html

G> However, I'm rejecting it on the basis that code so complicated to
G> require this feature is very rare. In most cases there are existing
G> work-arounds that produce clean code, for example using 'return'.
G> While I'm sure there are some (rare) real cases where clarity of
the
G> code would suffer from a refactoring that makes it possible to use
G> return, this is offset by two issues:

G> 1. The complexity added to the language, permanently. This affects
not
G> only all Python implementations, but also every source analysis
tool,
G> plus of course all documentation for the language.

Guido may have a point here about source tools but I don't think the
language becomes more complex. If anything it would become more
orthogonal - i.e. fewer arbitrary restrictions. And documentation is
needed for any change so saying that documentation would need to be
updated is an odd reason to reject a change.

G> 2. My expectation that the feature will be abused more than it will
be
G> used right, leading to a net decrease in code clarity (measured
across
G> all Python code written henceforth). Lazy programmers are
everywhere,
G> and before you know it you have an incredible mess on your hands of
G> unintelligible code.

Breaking out of an inner loop is just as natural as breaking out of
the immediately enclosing loop. ISTM that if one is allowed the other
should be also.

> You have several alternatives: refactor the loop ?
> into an auxiliary function, use a specific exception, add boolean flags, ?
> or repeat the test at the outer levels. (I usually choose the first).

The auxiliary function idea (Guido's preference as well as Gabriel's)
works but it may require accessing of variables which don't appear in
the function interface, and the "return" in that function is no
different from the break dropping through multiple levels. Return does
exactly that (as well as setting a result value).

There are often times when it *is* better to factor out the code to a
different function but adding a function just to enable a break from
an inner loop doesn't seem to me a good reason.

James


From ldo at geek-central.gen.new_zealand  Wed Mar 10 16:56:19 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Thu, 11 Mar 2010 10:56:19 +1300
Subject: Draft PEP on RSON configuration file format
References: <mailman.34.1267409372.23598.python-list@python.org>
	<4b8b5cef$0$1625$742ec2ed@news.sonic.net>
Message-ID: <hn94i3$3me$5@lust.ihug.co.nz>

In message <4b8b5cef$0$1625$742ec2ed at news.sonic.net>, John Nagle wrote:

> Patrick Maupin wrote:
>> 
>> Finding .ini configuration files too limiting, JSON and XML to hard to
>> manually edit, and YAML too complex to parse quickly, I have started
>> work on a new configuration file parser.
> 
>     You're not supposed to edit those formats manually.

Strange. A previous client of mine was a totally non-IT-technical guy, yet I 
was able to set him up with editing XML files (needed to drive some software 
I wrote for him) just fine.

Of course he was using a purpose-built editor, namely KXMLEditor.


From ldo at geek-central.gen.new_zealand  Wed Mar 10 16:57:15 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Thu, 11 Mar 2010 10:57:15 +1300
Subject: Passing FILE * types using ctypes
References: <a83319d7-c199-4532-9816-d002f7fd7914@q16g2000yqq.googlegroups.com>
	<bac1318c-d5a2-4dfc-a716-2977959f7a06@b30g2000yqd.googlegroups.com>
	<7vbrveFegeU1@mid.individual.net>
Message-ID: <hn94jr$3me$6@lust.ihug.co.nz>

In message <7vbrveFegeU1 at mid.individual.net>, Gregory Ewing wrote:

> If you need the same FILE * that Python is using, you
> may need to use ctypes to extract it out of the file
> object.

Why would Python be using a FILE *?


From ldo at geek-central.gen.new_zealand  Wed Mar 10 16:58:30 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Thu, 11 Mar 2010 10:58:30 +1300
Subject: Passing FILE * types using ctypes
References: <a83319d7-c199-4532-9816-d002f7fd7914@q16g2000yqq.googlegroups.com>
Message-ID: <hn94m6$3me$7@lust.ihug.co.nz>

In message <a83319d7-c199-4532-9816-
d002f7fd7914 at q16g2000yqq.googlegroups.com>, Zeeshan Quireshi wrote:

> Hello, I'm using ctypes to wrap a library i wrote. I am trying to pass
> it a FILE *pointer ...

Another option is to fix your library not to use stdio directly.


From isso.moh at gmail.com  Wed Mar 10 17:03:50 2010
From: isso.moh at gmail.com (mohamed issolah)
Date: Wed, 10 Mar 2010 23:03:50 +0100
Subject: show image in python
Message-ID: <d698368f1003101403t519b5efdt94892902026aee0b@mail.gmail.com>

Hey, This is my program

 1 #!/usr/bin/python
  2 import PIL
  3 import numpy
  4 import Image
  5 import ImageOps
  6 import sys
  7
  8 def Matimg(path):
  9         """transforme image en matrice"""
 10         Img = Image.open(str(path))
 11         Img1 = ImageOps.grayscale(Img)
 12         largeur,hauteur = Img1.size
 13         imdata = Img1.getdata()
 14         tab = numpy.array(imdata)
 15         matrix = numpy.reshape(tab,(hauteur,largeur))
 16         return matrix
 17
 18 def Creeimg():
 19         """transforme matrice en image"""
 20         img = Image.new ("L",(8,8))
 21         matrix = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
 22         img.putdata(matrix)
 23         img.show()
 24         img.save(fp="./ana.bmp")
 25
 26 if  __name__== '__main__':
 27     if len(sys.argv) < 2 :
 28         print "Usage: img.py <image>"
 29         sys.exit(0)
 30     path = sys.argv[1]
 31     matrix = Matimg(path)
 32     print matrix
 33     Creeimg()

My probeleme : In line 23 "img.show()" Don't work, normally I show the image
but it's not work, but strangely in line 24 "img.save(fp="./ana.bmp")" it's
work
WHERE IS THE PROBLEME.

I have this error in shell : "(eog:3176): GLib-WARNING **: GError set over
the top of a previous GError or uninitialized memory.
This indicates a bug in someone's code. You must ensure an error is NULL
before it's set.
The overwriting error message was: Error in getting image file info "


os: ubuntu 9.10

sorry for my english. ;-)

-- 
issolah mohamed
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From dreadpiratejeff at gmail.com  Wed Mar 10 17:04:47 2010
From: dreadpiratejeff at gmail.com (J)
Date: Wed, 10 Mar 2010 17:04:47 -0500
Subject: Ideas for creating processes
In-Reply-To: <36dec4ff1003101352g7d159742j2a0c76a6b0cd23fb@mail.gmail.com>
References: <36dec4ff1003101352g7d159742j2a0c76a6b0cd23fb@mail.gmail.com>
Message-ID: <36dec4ff1003101404v402f0b59lf0ac67e4a9c8cc3c@mail.gmail.com>

On Wed, Mar 10, 2010 at 16:52, J <dreadpiratejeff at gmail.com> wrote:
> the quick and dirty would be (as I'm imagining it at the moment):
> for path in pathlist:
> ? ?chdir into path
> ? ?execute rsync or zsync
>
> but that gets me moving into one dir, updating, then moving into another.
>
> What I was wondering about though, is spawning off separate rsync
> processes to run concurrently (each rsync will hit a different remote
> dir for each local dir)
>
> so I'm trying to figure out a good way to do this:
>
> for path in pathlist:
> ? ?kick off an individual rsync|zsync process to update path

And now I'm looking at subprocess and I can set shell=True and it will
intrepret special characters like &

So could I do something like this:

for item in pathlist:
    subprocess.Popen('rsync command &', shell=True)

and simply wait unti they are all done?


From robert.kern at gmail.com  Wed Mar 10 17:05:45 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 10 Mar 2010 16:05:45 -0600
Subject: Knight's tour Warndorff's algorithm problem
In-Reply-To: <hn945v$3me$4@lust.ihug.co.nz>
References: <mailman.527.1268199449.23598.python-list@python.org>
	<hn945v$3me$4@lust.ihug.co.nz>
Message-ID: <hn953q$u1c$1@dough.gmane.org>

On 2010-03-10 15:49 PM, Lawrence D'Oliveiro wrote:
> In message<mailman.527.1268199449.23598.python-list at python.org>, Gabriel
> Genellina wrote:
>
>> Warnsdorff's algorithm is heuristic ...
>
> Then it shouldn?t be called an ?algorithm?.

There are lots of algorithms that use heuristics or are heuristics. The two are 
orthogonal concepts.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From robert.kern at gmail.com  Wed Mar 10 17:09:26 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 10 Mar 2010 16:09:26 -0600
Subject: Passing FILE * types using ctypes
In-Reply-To: <hn94jr$3me$6@lust.ihug.co.nz>
References: <a83319d7-c199-4532-9816-d002f7fd7914@q16g2000yqq.googlegroups.com>	<bac1318c-d5a2-4dfc-a716-2977959f7a06@b30g2000yqd.googlegroups.com>	<7vbrveFegeU1@mid.individual.net>
	<hn94jr$3me$6@lust.ihug.co.nz>
Message-ID: <hn95am$u1c$2@dough.gmane.org>

On 2010-03-10 15:57 PM, Lawrence D'Oliveiro wrote:
> In message<7vbrveFegeU1 at mid.individual.net>, Gregory Ewing wrote:
>
>> If you need the same FILE * that Python is using, you
>> may need to use ctypes to extract it out of the file
>> object.
>
> Why would Python be using a FILE *?

In Python 2.x, Python's file objects use a stdio FILE* pointer underneath. The 
I/O subsystem was rewritten in Python 3.x to use only file descriptors.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From invalid at invalid.invalid  Wed Mar 10 17:09:58 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Wed, 10 Mar 2010 22:09:58 +0000 (UTC)
Subject: Knight's tour Warndorff's algorithm problem
References: <mailman.527.1268199449.23598.python-list@python.org>
	<hn945v$3me$4@lust.ihug.co.nz>
Message-ID: <hn95bm$aql$1@reader1.panix.com>

On 2010-03-10, Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> wrote:
> In message <mailman.527.1268199449.23598.python-list at python.org>, Gabriel 
> Genellina wrote:
>
>> Warnsdorff's algorithm is heuristic ...
>
> Then it shouldn???t be called an ???algorithm???.

Why?  An algorithm is just a well-defined series of steps.

Just because it uses heuristics doesn't mean it's not an algorithm.
In my book it's still an algorithm even if it never produces a correct
result.  It's just not a very _good_ algorithm. :)

-- 
Grant Edwards               grant.b.edwards        Yow! YOU PICKED KARL
                                  at               MALDEN'S NOSE!!
                              gmail.com            


From xahlee at gmail.com  Wed Mar 10 17:36:58 2010
From: xahlee at gmail.com (Xah Lee)
Date: Wed, 10 Mar 2010 14:36:58 -0800 (PST)
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<4b90a1f8$0$1629$742ec2ed@news.sonic.net>
	<0d381135-730a-45e4-9225-9ba2a29b77fe@k2g2000pro.googlegroups.com>
	<Xns9D35C3BFCE829duncanbooth@127.0.0.1>
	<13c167f4-5e37-48a0-a480-3494c212035c@k5g2000pra.googlegroups.com>
	<Xns9D37B1793F70Aduncanbooth@127.0.0.1>
Message-ID: <06323935-e1a0-4447-b4d8-f62bf94dfb40@e19g2000prn.googlegroups.com>

On Mar 10, 9:26?am, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> No, I'm saying that if you plan to build a business that could grow you
> should be clear up front how you plan to handle the growth. It's too late
> if you suddenly discover your platform isn't scalable just when you need to
> scale it.

Right, but that doesn't seems to have any relevance about my point.
Many says that scalability is key to NoSQL, i pointed out that unless
you are like google, or ranked top 1000 in the world in terms data
size, the scalability reason isn't that strong.

Xah Lee wrote:

> many people mentioned scalibility... though i think it is fruitful to
> talk about at what size is the NoSQL databases offer better
> scalability than SQL databases.
>
> For example, consider, if you are within world's top 100th user of
> database in terms of database size, such as Google, then it may be
> that the off-the-shelf tools may be limiting. But how many users
> really have such massive size of data?  note that google's need for
> database today isn't just a seach engine.
>
> It's db size for google search is probably larger than all the rest of
> search engine company's sizes combined. Plus, there's youtube (vid
> hosting), gmail, google code (source code hosting), google blog, orkut
> (social networking), picasa (photo hosting), etc, each are all ranked
> within top 5 or so with respective competitors in terms of number of
> accounts... so, google's datasize is probably number one among the
> world's user of databases, probably double or triple than the second
> user with the most large datasize. At that point, it seems logical
> that they need their own db, relational or not.

  Xah
? http://xahlee.org/

?


From alfps at start.no  Wed Mar 10 17:53:09 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 10 Mar 2010 23:53:09 +0100
Subject: Named loops for breaking
In-Reply-To: <c809ceee-34ff-409c-b645-3cb833ce6f8a@g19g2000yqe.googlegroups.com>
References: <6d6a35e8-f09c-4792-8abe-5a0dc24d214e@g28g2000yqh.googlegroups.com>
	<mailman.529.1268202554.23598.python-list@python.org>
	<c809ceee-34ff-409c-b645-3cb833ce6f8a@g19g2000yqe.googlegroups.com>
Message-ID: <hn97sm$e8f$1@news.eternal-september.org>

* James Harris:
> On 10 Mar, 06:29, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
>> En Tue, 09 Mar 2010 18:41:10 -0300, Daniel Klein <bri... at gmail.com>  
>> escribi :
>>
>>> Basically I'm wondering if there are any plans to implemented named
>>> loops in Python, so I can tell a break command to break out of a
>>> specific loop in the case of nested loops.
>> See PEP3136 [1] and its rejection note [2]
>> I think you may find some more discussion in the python-ideas list.
>>
>>> Currently I'm using boolean
>>> flag variables, but I find that very clumsy. I know this idea of
>>> breaking out of specific loops from javascript; I guess java does it
>>> too. It just seems a very Pythonian idea to me: clear, promotes code
>>> legibility, seems obvious.
>> Although I've occasionally missed the feature myself, I agree with Guido's  
>> arguments against it.
> 
> I don't agree with Guido's second reason in particular. He writes in
> the link Gabriel provided
> 
>   > [2]http://mail.python.org/pipermail/python-3000/2007-July/
> 008663.html
> 
> G> However, I'm rejecting it on the basis that code so complicated to
> G> require this feature is very rare. In most cases there are existing
> G> work-arounds that produce clean code, for example using 'return'.
> G> While I'm sure there are some (rare) real cases where clarity of
> the
> G> code would suffer from a refactoring that makes it possible to use
> G> return, this is offset by two issues:
> 
> G> 1. The complexity added to the language, permanently. This affects
> not
> G> only all Python implementations, but also every source analysis
> tool,
> G> plus of course all documentation for the language.
> 
> Guido may have a point here about source tools but I don't think the
> language becomes more complex. If anything it would become more
> orthogonal - i.e. fewer arbitrary restrictions. And documentation is
> needed for any change so saying that documentation would need to be
> updated is an odd reason to reject a change.
> 
> G> 2. My expectation that the feature will be abused more than it will
> be
> G> used right, leading to a net decrease in code clarity (measured
> across
> G> all Python code written henceforth). Lazy programmers are
> everywhere,
> G> and before you know it you have an incredible mess on your hands of
> G> unintelligible code.
> 
> Breaking out of an inner loop is just as natural as breaking out of
> the immediately enclosing loop. ISTM that if one is allowed the other
> should be also.
> 
>> You have several alternatives: refactor the loop  
>> into an auxiliary function, use a specific exception, add boolean flags,  
>> or repeat the test at the outer levels. (I usually choose the first).
> 
> The auxiliary function idea (Guido's preference as well as Gabriel's)
> works but it may require accessing of variables which don't appear in
> the function interface, and the "return" in that function is no
> different from the break dropping through multiple levels. Return does
> exactly that (as well as setting a result value).
> 
> There are often times when it *is* better to factor out the code to a
> different function but adding a function just to enable a break from
> an inner loop doesn't seem to me a good reason.

Gabriel Genellina mentioned these alternatives: "refactor the loop into an 
auxiliary function, use a specific exception, add boolean flags, or repeat the 
test at the outer levels. (I usually choose the first)"

And I agree, but in Python there is at least one more very practical 
alternative, namely /flatting/ the nested loops, representing them as a single loop.

It can go like this  --  very artifical construed example:


<code>
from __future__ import print_function
try:
     range = xrange
except:
     pass

def inclusive_range( first, last ):
     return range( first, last + 1 )

def xy_range( x_range, y_range ):
     for x in x_range:
         for y in y_range:
             yield (x, y)

def main():
     needle = 42
     x_range = inclusive_range( 1, 10 )
     y_range = inclusive_range( 1, 10 )
     pos = None
     for (x, y) in xy_range( x_range, y_range ):
         if x*y == needle:
             pos = (x, y)
             break
     if pos is None:
         print( "Sorry, {0} not found.".format( needle ) )
     else:
         print( "{0} found at {1}.".format( needle, pos ) )

main()
</code>


Cheers & hth.,

- Alf

PS: Gabriel, if you read this and don't understand it (as you mentioned in 
another thread that you never understand my postings), please just ask!


From martin.hellwig at dcuktec.org  Wed Mar 10 17:55:25 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Wed, 10 Mar 2010 22:55:25 +0000
Subject: Ideas for creating processes
In-Reply-To: <mailman.577.1268257971.23598.python-list@python.org>
References: <mailman.577.1268257971.23598.python-list@python.org>
Message-ID: <hn980q$esb$1@news.eternal-september.org>

On 03/10/10 21:52, J wrote:
> I'm working on a project and thought I'd ask for a suggestion on how
> to proceed (I've got my own ideas, but I wanted to see if I was on the
> right track)
<cut subprocess idea>
Well I can't speak with authority but I would go into similar lines, 
especially since you want to call an external program in the end anyway. 
Otherwise threading might have been an option.

Just make sure that all subprocesses are exited nicely before you are on 
the end of your script ;-)

-- 
mph


From nyamatongwe+thunder at gmail.com  Wed Mar 10 18:01:05 2010
From: nyamatongwe+thunder at gmail.com (Neil Hodgson)
Date: Wed, 10 Mar 2010 23:01:05 GMT
Subject: file seek is slow
In-Reply-To: <d86f1068-8cd4-4489-af00-450d407baf41@g28g2000prb.googlegroups.com>
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>
	<daf5c75e-8139-4a4a-8c27-5cef00327bb1@o3g2000yqb.googlegroups.com>
	<d86f1068-8cd4-4489-af00-450d407baf41@g28g2000prb.googlegroups.com>
Message-ID: <RwVln.12295$pv.5770@news-server.bigpond.net.au>

Metalone:

> As it turns out each call is only
> 646 nanoseconds slower than 'C'.
> However, that is still 80% of the time to perform a file seek,
> which I would think is a relatively slow operation compared to just
> making a system call.

   A seek may not be doing much beyond setting a current offset value.
It is likely that fseek(f1, 0, SEEK_SET) isn't even doing a system call.

   An implementation of fseek will often return relatively quickly when
the position is within the current buffer -- from line 192 in
http://www.google.com/codesearch/p?hl=en#XAzRy8oK4zA/libc/stdio/fseek.c&q=fseek&sa=N&cd=1&ct=rc

   Neil


From python at mrabarnett.plus.com  Wed Mar 10 18:03:17 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 10 Mar 2010 23:03:17 +0000
Subject: Ideas for creating processes
In-Reply-To: <36dec4ff1003101352g7d159742j2a0c76a6b0cd23fb@mail.gmail.com>
References: <36dec4ff1003101352g7d159742j2a0c76a6b0cd23fb@mail.gmail.com>
Message-ID: <4B982535.4080000@mrabarnett.plus.com>

J wrote:
> I'm working on a project and thought I'd ask for a suggestion on how
> to proceed (I've got my own ideas, but I wanted to see if I was on the
> right track)
> 
> For now, I've got this:
> 
> def main():
> ## get our list of directories to refresh
>     releases=sys.argv[1:]
>     if len(releases) < 1:
>         print "You need to provide at least one dir to update"
>         sys.exit()
> 
>     ## Lets figure out what there is to update
>     updateDirs = []
>     for rel in releases:
>         currentDir = os.path.join(homedir, rel)
>         for item in os.listdir(currentDir):
>             updateDirs += [os.path.join(homedir, rel, item)]
> 
> which returns a list of full pathnames to directories that need to be
> updated (updates will be carried out by calling rsync or zsync
> eventually)
> 
> The directory hierarchy looks like this:
> 
> /home/user/files
> /home/user/files/version1
> /home/user/files/version1/type1
> /home/user/files/version1/type2
> /home/user/files/version2
> /home/user/files/version2/type1
> 
> and the list ends up looking like this:
> 
> ['/home/user/files/version1/type1','/home/user/files/version1/type2','/home/user/files/version2/type1','/home/user/files/version2/type2']
> 
> the next thing I need to do is figure out how to update those.
> 
> the quick and dirty would be (as I'm imagining it at the moment):
> for path in pathlist:
>     chdir into path
>     execute rsync or zsync
> 
> but that gets me moving into one dir, updating, then moving into another.
> 
> What I was wondering about though, is spawning off separate rsync
> processes to run concurrently (each rsync will hit a different remote
> dir for each local dir)
> 
> so I'm trying to figure out a good way to do this:
> 
> for path in pathlist:
>     kick off an individual rsync|zsync process to update path
> 
> wait for all child processes to end
> exit program.
> 
> I've been looking at subprocess because at the moment, that's all I
> really know...
> But is there a better way of kicking off multiple simultaneous
> processes so I can update all dirs at once instead of one at a time?
> 
> No, this isn't homework, it's something I'm working on to sync a
> couple directories of ISO images to grab nightly builds
> Yes, there are plenty of pre-made scripts out there, but I don't want
> to even look at those because I figured this would be a good learning
> experience, and I want to try to solve this as much on my own as I can
> without just cut and pasting from someone elses program.
> 
> So, with that said, any ideas on the best way to proceed?  I'm going
> to start looking at ways to use subprocess to do this, or would there
> be a better way (multi-threading maybe?)
> 
> Or am I even in the right ballpark?
> 
Are you sure that you would gain from doing more than one at a time?

The bottleneck will probably be the speed of your network connection,
and if that's working at its maximum speed with one sync then doing
several concurrently won't save any time. (The syncs will also be
completing for disk I/O.)

It might, however, save time if the remote server takes time to respond
to a sync and/or doesn't use your network connection at its maximum
speed (the server's connection will have its own limits, of course, and
might be talking to other computers at the same time).

You could increase the number of concurrent syncs until you find the
number that gives the best results.


From nilly16 at yahoo.com  Wed Mar 10 18:06:41 2010
From: nilly16 at yahoo.com (Jimbo)
Date: Wed, 10 Mar 2010 15:06:41 -0800 (PST)
Subject: Python Script to get Info from Site not working
Message-ID: <993c3089-0f96-4f37-b42a-111731045b2d@k24g2000pro.googlegroups.com>

Hello

I am asking what is probably a very easy thing to do but I cannot find
a tutorial on how to do it anywhere. [b]I want to use a Python script
to get information from a webpage. [/b]

I found a semi Python & internet tutorial here if anyone else would
like it http://www.upriss.org.uk/python/session6.html

I would like to create a python script that gets a value from a set of
radio buttons on a HTML page & tell me which one is selected.

I have 3 radio buttons: Tea, Coffee, Hot Chocolate & a Submit button

My script is meant to find which radio button is selected & tell me
that. But it just keeps saying "No Drink Selected!"

Can you help me figure out how to fix this. FYI: My Python script & my
HTML page are both saved in the same directory. And I made the webpage
using Notepad++, I open the webpage in Interent Explorer & I made the
Python Script in Idle.

Python Script:
[code]# Practice 9 CGI

######### don't change the following three lines: ###########
import cgi
print("Content-Type: text/html\n")
form = cgi.FieldStorage()

## add a form.getvalue for each of the names in your form: ##
drink = form.getvalue("drink")

########## start of HTML code ###########
print("""
<html>
<head> <title>What would you like to drink</title> </head>
<body>
<h4>Your drink: </h4><p>
""")
############ end of HTML code #############

if drink == "tea":
    print("You requested tea.")
elif drink == "coffee":
    print("You requested coffee.")
elif drink == "hot chocolate":
    print ("You requested hot chocolate.")
else:
    print ("You need to select a drink!")

########### start of HTML code ###########
print ("""
<p>Thank you for your visit. Please come again. <p>
</body></html>
""")
############# end of HTML code ##############
[/code]

HTML Code:
[code]<html>
<head>


</head>

<body>

<form action="practice9.py" method="post">

<input type="radio" name="drink" value="tea" checked > Tea <br>
<input type="radio" name="drink" value="coffee" > Coffee <br>
<input type="radio" name="drink" value="hot chocolate" > Hot Chocolate
<p>

<input type="submit" value="Place order">
</form>


</body>
</html>[/code]


From news1234 at free.fr  Wed Mar 10 18:17:19 2010
From: news1234 at free.fr (News123)
Date: Thu, 11 Mar 2010 00:17:19 +0100
Subject: Import problem
In-Reply-To: <mailman.542.1268224068.23598.python-list@python.org>
References: <6630f859-b85d-4841-b1d5-2a563dca9cbb@q15g2000yqj.googlegroups.com>	<mailman.460.1268053858.23598.python-list@python.org>	<4b957866$0$17135$426a34cc@news.free.fr>
	<mailman.542.1268224068.23598.python-list@python.org>
Message-ID: <4B98287F.2010101@free.fr>

Hi JM,

Jean-Michel Pichavant wrote:
> News123 wrote:
>> Jean-Michel Pichavant wrote:
>>  
>>> Johny wrote:
>>>    
>>>> I have this directory structure
>>>>
>>>> C:
>>>>       \A
>>>>          __init__.py
>>>>          amodule.py
>>>>
>>>>          \B
>>>>           __init__.py
>>>>           bmodule.py
>>>>
>>>>            \D
>>>>             __init__.py
>>>>             dmodule.py
>>>>
>>>> and  I want to import  bmodule.py
>>>> C:\>cd \
>>>>
>>>> C:\>python
>>>> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
>>>> (Intel)] on win
>>>> 32
>>>> Type "help", "copyright", "credits" or "license" for more information.
>>>>  
>>>>      
>>>>>>> from A.B import  bmodule
>>>>>>>                     
>>>> I am bmodule
>>>>   C:\>
>>>>
>>>> so far so good. Now I would like to import bmodule but if the current
>>>> directory is \D subdirectory.
>>>>
>>>> C:> cd \A\B\D
>>>> C:\A\B\D>
>>>> C:\A\B\D>python
>>>> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
>>>> (Intel)] on win
>>>> 32
>>>> Type "help", "copyright", "credits" or "license" for more information.
>>>>  
>>>>      
>>>>>>> import sys
>>>>>>> sys.path.append('C:\\A')
>>>>>>> from A.B import bmodule
>>>>>>>                     
>>>> Traceback (most recent call last):
>>>>   File "<stdin>", line 1, in <module>
>>>> ImportError: No module named A.B
>>>>
>>>> C:\>
>>>>
>>>> so I can not import a module from the parent directory? Or where did I
>>>> make an error?
>>>> Thanks for help
>>>>
>>>> L.
>>>>         
>>> try
>>>
>>> import sys
>>> sys.path.append('C:\\')
>>> from A.B import bmodule
>>>
>>>     
>> is there any 'automatic' way of finding the top level
>> directory?basically the 'top level directory is the first directory
>> going upwards, that doesn't contain a __init__.py file.
>>   
> what if some user has an __init__.py file the top level directory of
> your package ?

Is there any other usage of __init.py__ than indicating a module directory?
I wasn't aware of it, but you're right I did not investigte in depth and
users can of course do whatever they like.



>> of course you could do this 'manually' by
>> doing:
>>
>> # assume, that this module is A.amodule
>> import sys
>> import os
>>
>> # I'd love to have a similiar automatic construct
>> if __name__ == "__main__":
>>     level = 1 # or function locating how far to go up before
>>               # finding a dir, whcih does not contain a __init__.py
>>     mydir = os.path.split(__file__)[0]
>>     topdir = os.path.join( mydir,*(("..",)*level))
>>     abstop = os.path.abspath(topdir)
>>     sys.path.append(abstop)
>>
>> ## now you can import with the normal module paths
>>
>> import A.blo
>> print "and I found blo",dir(A.blo)
>>
>>   
> You don't want to do that and you don't need it neither. That's what the
> env variable PYTHONPATH is for. set it correctly, install your package
> inside and everything works just fine (+standard). With a linux OS it
> easy to create smb links to point to any working directory. It should be
> possible on windows as well.
I like your idea with the symlinks.
However not sure how to do it with windows.
I assume default shortcuts won't do.
> 
> If your package is meant to be destributed, you may use setup.py
> 
> 
Well,

It's nice if a user just unpacks a zip file and can click on any script
with the .py suffix in the tree.

(Its nice for example for tutorials / demos )

It's also nice if he can later on just delete the unpacked directory and
there will be no trace left in the registry or in the python base dir.

This is why I'm interested in solutions without setup.py or changing
environment variables.

bye


N






From news1234 at free.fr  Wed Mar 10 18:18:05 2010
From: news1234 at free.fr (News123)
Date: Thu, 11 Mar 2010 00:18:05 +0100
Subject: Import problem
In-Reply-To: <mailman.542.1268224068.23598.python-list@python.org>
References: <6630f859-b85d-4841-b1d5-2a563dca9cbb@q15g2000yqj.googlegroups.com>	<mailman.460.1268053858.23598.python-list@python.org>	<4b957866$0$17135$426a34cc@news.free.fr>
	<mailman.542.1268224068.23598.python-list@python.org>
Message-ID: <4b9828ad$0$698$426a74cc@news.free.fr>

Hi JM,

Jean-Michel Pichavant wrote:
> News123 wrote:
>> Jean-Michel Pichavant wrote:
>>  
>>> Johny wrote:
>>>    
>>>> I have this directory structure
>>>>
>>>> C:
>>>>       \A
>>>>          __init__.py
>>>>          amodule.py
>>>>
>>>>          \B
>>>>           __init__.py
>>>>           bmodule.py
>>>>
>>>>            \D
>>>>             __init__.py
>>>>             dmodule.py
>>>>
>>>> and  I want to import  bmodule.py
>>>> C:\>cd \
>>>>
>>>> C:\>python
>>>> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
>>>> (Intel)] on win
>>>> 32
>>>> Type "help", "copyright", "credits" or "license" for more information.
>>>>  
>>>>      
>>>>>>> from A.B import  bmodule
>>>>>>>                     
>>>> I am bmodule
>>>>   C:\>
>>>>
>>>> so far so good. Now I would like to import bmodule but if the current
>>>> directory is \D subdirectory.
>>>>
>>>> C:> cd \A\B\D
>>>> C:\A\B\D>
>>>> C:\A\B\D>python
>>>> Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
>>>> (Intel)] on win
>>>> 32
>>>> Type "help", "copyright", "credits" or "license" for more information.
>>>>  
>>>>      
>>>>>>> import sys
>>>>>>> sys.path.append('C:\\A')
>>>>>>> from A.B import bmodule
>>>>>>>                     
>>>> Traceback (most recent call last):
>>>>   File "<stdin>", line 1, in <module>
>>>> ImportError: No module named A.B
>>>>
>>>> C:\>
>>>>
>>>> so I can not import a module from the parent directory? Or where did I
>>>> make an error?
>>>> Thanks for help
>>>>
>>>> L.
>>>>         
>>> try
>>>
>>> import sys
>>> sys.path.append('C:\\')
>>> from A.B import bmodule
>>>
>>>     
>> is there any 'automatic' way of finding the top level
>> directory?basically the 'top level directory is the first directory
>> going upwards, that doesn't contain a __init__.py file.
>>   
> what if some user has an __init__.py file the top level directory of
> your package ?

Is there any other usage of __init.py__ than indicating a module directory?
I wasn't aware of it, but you're right I did not investigte in depth and
users can of course do whatever they like.



>> of course you could do this 'manually' by
>> doing:
>>
>> # assume, that this module is A.amodule
>> import sys
>> import os
>>
>> # I'd love to have a similiar automatic construct
>> if __name__ == "__main__":
>>     level = 1 # or function locating how far to go up before
>>               # finding a dir, whcih does not contain a __init__.py
>>     mydir = os.path.split(__file__)[0]
>>     topdir = os.path.join( mydir,*(("..",)*level))
>>     abstop = os.path.abspath(topdir)
>>     sys.path.append(abstop)
>>
>> ## now you can import with the normal module paths
>>
>> import A.blo
>> print "and I found blo",dir(A.blo)
>>
>>   
> You don't want to do that and you don't need it neither. That's what the
> env variable PYTHONPATH is for. set it correctly, install your package
> inside and everything works just fine (+standard). With a linux OS it
> easy to create smb links to point to any working directory. It should be
> possible on windows as well.
I like your idea with the symlinks.
However not sure how to do it with windows.
I assume default shortcuts won't do.
> 
> If your package is meant to be destributed, you may use setup.py
> 
> 
Well,

It's nice if a user just unpacks a zip file and can click on any script
with the .py suffix in the tree.

(Its nice for example for tutorials / demos )

It's also nice if he can later on just delete the unpacked directory and
there will be no trace left in the registry or in the python base dir.

This is why I'm interested in solutions without setup.py or changing
environment variables.

bye


N






From ndbecker2 at gmail.com  Wed Mar 10 18:38:10 2010
From: ndbecker2 at gmail.com (Neal Becker)
Date: Wed, 10 Mar 2010 18:38:10 -0500
Subject: Can't define __call__ within __init__?
References: <hn85re$vj9$1@dough.gmane.org>
	<8c7f10c61003100527o7c7f9375ie662ce67ab78f1de@mail.gmail.com>
	<mailman.549.1268228501.23598.python-list@python.org>
	<Xns9D37B39F7893Bduncanbooth@127.0.0.1>
	<hn8o26$aik$1@dough.gmane.org> <hn8u86$2r0$2@dough.gmane.org>
Message-ID: <hn9ah2$gef$2@dough.gmane.org>

Robert Kern wrote:

> On 2010-03-10 12:23 PM, Neal Becker wrote:
>> Duncan Booth wrote:
>> ...
>>>
>>> P.S. I don't know what you did in your post but your Followup-To header
>>> is pointing to a group on gmane which makes extra work for me replying.
>>> Please don't do that.
>>
>> I'm sorry about that, there is some bad interaction between gmane's nntp-
>> smtp gateway and python's mail list.  I don't know what to do about it. 
>> I think the problem only happens on python's mail list (I've never seen
>> it reported on any of the MANY other lists I use via gmane).
> 
> I think it may be your news reader adding the Original-Followup-To header.
> I use Thunderbird 3 to read this list via GMane, too, but my posts do not
> contain the header. What newsreader are you using?
> 

knode.



From sjdevnull at yahoo.com  Wed Mar 10 18:38:28 2010
From: sjdevnull at yahoo.com (sjdevnull at yahoo.com)
Date: Wed, 10 Mar 2010 15:38:28 -0800 (PST)
Subject: file seek is slow
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>
	<daf5c75e-8139-4a4a-8c27-5cef00327bb1@o3g2000yqb.googlegroups.com> 
	<d86f1068-8cd4-4489-af00-450d407baf41@g28g2000prb.googlegroups.com> 
	<RwVln.12295$pv.5770@news-server.bigpond.net.au>
Message-ID: <e8a9a95f-77b3-43ce-8110-8c6babaa6f26@z4g2000yqa.googlegroups.com>

On Mar 10, 6:01?pm, Neil Hodgson <nyamatongwe+thun... at gmail.com>
wrote:
> Metalone:
>
> > As it turns out each call is only
> > 646 nanoseconds slower than 'C'.
> > However, that is still 80% of the time to perform a file seek,
> > which I would think is a relatively slow operation compared to just
> > making a system call.
>
> ? ?A seek may not be doing much beyond setting a current offset value.
> It is likely that fseek(f1, 0, SEEK_SET) isn't even doing a system call.

Exactly.  If I replace both calls to fseek with gettimeofday (aka
time.time() on my platform in python) I get fairly close results:
$ ./testseek
4.120
$ python2.5 testseek.py
4.170
$ ./testseek
4.080
$ python2.5 testseek.py
4.130


FWIW, my results with fseek aren't as bad as those of the OP.  This is
python2.5 on a 2.6.9 Linux OS, with psyco:
$ ./testseek
0.560
$ python2.5 testseek.py
0.750
$ ./testseek
0.570
$ python2.5 testseek.py
0.760


From rbrt.somerville at gmail.com  Wed Mar 10 18:48:14 2010
From: rbrt.somerville at gmail.com (robert somerville)
Date: Wed, 10 Mar 2010 15:48:14 -0800
Subject: Elementtree install problem in Ubuntu (a newbie ..)
Message-ID: <2fb4a5011003101548x862eef2w4f46473bae4bf9f4@mail.gmail.com>

Hi ;
I installed the elementtree and celementree packages throught the synaptic
package manager, all seems to go fine through the install ...

when i startup python and try to import them (as per the EFFBOTT.org
suggestions) .. PROBLEMS ... (see below ..) What am i doing wrong ??? this
is a new window after installation of packages ...

Python 2.6.4 (r264:75706, Dec  7 2009, 18:43:55)
[GCC 4.4.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import elementtree.ElementTree as ET
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named elementtree.ElementTree
>>> import elementtree
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named elementtree


thanks;
Robert somerville
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From philip at semanchuk.com  Wed Mar 10 18:56:08 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Wed, 10 Mar 2010 18:56:08 -0500
Subject: Elementtree install problem in Ubuntu (a newbie ..)
In-Reply-To: <2fb4a5011003101548x862eef2w4f46473bae4bf9f4@mail.gmail.com>
References: <2fb4a5011003101548x862eef2w4f46473bae4bf9f4@mail.gmail.com>
Message-ID: <C95A373F-79E0-4865-BF6E-81CC3ACBDC36@semanchuk.com>


On Mar 10, 2010, at 6:48 PM, robert somerville wrote:

> Hi ;
> I installed the elementtree and celementree packages throught the  
> synaptic
> package manager, all seems to go fine through the install ...
>
> when i startup python and try to import them (as per the EFFBOTT.org
> suggestions) .. PROBLEMS ... (see below ..) What am i doing  
> wrong ??? this
> is a new window after installation of packages ...
>
> Python 2.6.4 (r264:75706, Dec  7 2009, 18:43:55)
> [GCC 4.4.1] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import elementtree.ElementTree as ET
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
> ImportError: No module named elementtree.ElementTree
>>>> import elementtree
> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
> ImportError: No module named elementtree

Hi Robert,
In Python >= 2.5, ElementTree is part the standard library so it  
doesn't need to be installed separately. Here's the documentation for  
it:
http://www.python.org/doc/2.6.4/library/xml.etree.elementtree.html


HTH
Philip


From genetiq at gmail.com  Wed Mar 10 19:05:13 2010
From: genetiq at gmail.com (phantasm)
Date: Wed, 10 Mar 2010 16:05:13 -0800 (PST)
Subject: Can't install PIL on MacOS X Leopard
Message-ID: <94070db2-91f0-47a8-a259-36378aab95ea@o3g2000yqb.googlegroups.com>

Hello!

I'm trying to install PIL module on MacOS X Leopard with python 2.6.
Everything seemed to be fine - now I have PIL egg package in "site-
packages" directory, but when I'm trying "import PIL", I get an error
"ImportError: No module named PIL".

All other modules such as SQL Alchemy work fine. Their EGGs reside in
a same directory as a resulting PIL package.

I've tried to install either via easy_install and manually, results
are the same. PYTHONPATH environment variable is set to a correct
directory. python command "import _imaging" returns no error.

What I'm doing wrong?


From rbrt.somerville at gmail.com  Wed Mar 10 19:17:29 2010
From: rbrt.somerville at gmail.com (robert somerville)
Date: Wed, 10 Mar 2010 16:17:29 -0800
Subject: Python 2.6 and modules dbi AND odbc
Message-ID: <2fb4a5011003101617r5518b322y6ccc091046b0ccc4@mail.gmail.com>

hi;
 i am trying to get some legacy python code (which i no nothing about)
working with tries to import dbi and odbc (the import fails ...) it looks
like these modules are deprecated ?? if so is there a work around , if not
deprecated, what am i doing wrong ?? i see no Ubuntu packages that look
promising ..

Robert Somerville
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From nad at acm.org  Wed Mar 10 19:34:51 2010
From: nad at acm.org (Ned Deily)
Date: Wed, 10 Mar 2010 16:34:51 -0800
Subject: Can't install PIL on MacOS X Leopard
References: <94070db2-91f0-47a8-a259-36378aab95ea@o3g2000yqb.googlegroups.com>
Message-ID: <nad-E0CB2A.16345110032010@dough.gmane.org>

In article 
<94070db2-91f0-47a8-a259-36378aab95ea at o3g2000yqb.googlegroups.com>,
 phantasm <genetiq at gmail.com> wrote:
> I'm trying to install PIL module on MacOS X Leopard with python 2.6.
> Everything seemed to be fine - now I have PIL egg package in "site-
> packages" directory, but when I'm trying "import PIL", I get an error
> "ImportError: No module named PIL".
> 
> All other modules such as SQL Alchemy work fine. Their EGGs reside in
> a same directory as a resulting PIL package.
> 
> I've tried to install either via easy_install and manually, results
> are the same. PYTHONPATH environment variable is set to a correct
> directory. python command "import _imaging" returns no error.
> 
> What I'm doing wrong?

Hard to say without more information but it does seem odd that _imaging 
can be imported.  One thing to try:

$ python2.6
Python 2.6.4 (r264:75706, Oct 28 2009, 20:34:51) 
[GCC 4.0.1 (Apple Inc. build 5493)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import _imaging
>>> _imaging.__file__
'/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-pac
kages/PIL/_imaging.so'
# or something like that

Make sure the file is located within the expected PIL directory.  Also 
make sure there aren't any file permission problems on any of the PIL 
directories and files.  I'm assuming PIL was installed as an unzipped 
egg.  And double-check the contents of any .pth files.

-- 
 Ned Deily,
 nad at acm.org



From genetiq at gmail.com  Wed Mar 10 19:43:26 2010
From: genetiq at gmail.com (phantasm)
Date: Wed, 10 Mar 2010 16:43:26 -0800 (PST)
Subject: Can't install PIL on MacOS X Leopard
References: <94070db2-91f0-47a8-a259-36378aab95ea@o3g2000yqb.googlegroups.com>
	<mailman.587.1268267720.23598.python-list@python.org>
Message-ID: <a9ae54cc-b4d2-467f-835b-f473adb26234@o3g2000yqb.googlegroups.com>

Thank you for your reply, Ned, but I just tried to install it again
and found out that I didn't finally run "python setup.py install"
after building PIL manually. It solved the problem.


From gagsl-py2 at yahoo.com.ar  Wed Mar 10 20:37:01 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 10 Mar 2010 22:37:01 -0300
Subject: Does this already exists?: A module that checks if the used
	platform is supported
References: <hn88ag$b5m$1@news.eternal-september.org>
Message-ID: <op.u9dqrznnx6zn5v@lepton.softlabbsas.com.ar>

En Wed, 10 Mar 2010 10:54:27 -0300, Martin P. Hellwig
<martin.hellwig at dcuktec.org> escribi?:

> Before I start reinventing a squared wheel, I have the following  
> question:
> Is there already a (standard) module that wraps around the various  
> os/sys information which checks if the platform + version is supported  
> for what I want to do with it.

In case you were not aware of it: see the platform module. But you'll have
to do the checks yourself (based on the info it returns).

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Wed Mar 10 20:37:08 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 10 Mar 2010 22:37:08 -0300
Subject: Importing Modules
References: <676034.43316.qm@web30001.mail.mud.yahoo.com>
Message-ID: <op.u9dqr6b1x6zn5v@lepton.softlabbsas.com.ar>

En Wed, 10 Mar 2010 09:19:29 -0300, PEYMAN ASKARI <paskari007 at yahoo.ca>
escribi?:

> I wanted to know if imported classes are treated differently than  
> internal classes.

If by 'internal classes' you mean 'classes defined in the main module',
no, they're absolutely the same.

> class A():
>  __init__(self):
>   pass
>
> and call A, or A() I get something to the effect of  <__main__.A  
> instance at 0xb7f088ac>
>
> but if I call from module_name import A and then call A or A() I get  
> something to the effect of  <module_4.module_4 instance at 0xb7f0882c>

Note that both reprs have the same structure. Both say
<modulename.classname instance at ...>
When you execute `python test_import.py`, the code is executed into a
newly created module called __main__ (not test_import). So __main__ is the
name of the main module, and __main__.A is the full name of the A class
defined in the __main__ module.
In the other case, module_4.module_4 is the full name of the module_4
class defined in the module_4 module.

> I was wondering if this would be a problem.

In general, no, you shouldn't care. There is a problem, though, if some
other module imports the main one (using `import test_import`). Python
knows the main one as "__main__", not as "test_import", so it will load it
*again*, and you'll end with two separate copies of the same module.
Solution: don't do that :) -- redesign your application so subordinate
modules don't have to import the main one (move the required parts into a
third module).

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Wed Mar 10 20:37:14 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 10 Mar 2010 22:37:14 -0300
Subject: Interacting With Another Script
References: <4dc0cfea1003100432h2495ede1vf5e5bd75172ab5ea@mail.gmail.com>
Message-ID: <op.u9dqscw0x6zn5v@lepton.softlabbsas.com.ar>

En Wed, 10 Mar 2010 09:32:15 -0300, Victor Subervi
<victorsubervi at gmail.com> escribi?:

> There's a program (vpopmail) that has commands which, when called,  
> request
> input ("email address", "password", etc.) from the command line. I would
> like to build a TTW interface for my clients to use that interacts with
> these commands.

I know nothing about vpopmail, but can't you provide all the required
information by some other means? Command line arguments, a configuration
file, perhaps there is an API to call some internal functions? Faking an
interactive session would be my last option.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Wed Mar 10 20:37:18 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 10 Mar 2010 22:37:18 -0300
Subject: Method / Functions - What are the differences?
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4b8c2a34$0$10470$426a74cc@news.free.fr>
	<mailman.81.1267492052.23598.python-list@python.org>
	<4b8cd310$0$4604$426a34cc@news.free.fr>
	<mailman.109.1267539415.23598.python-list@python.org>
	<hmk1mn$70u$1@newsreader3.netcologne.de>
	<4b8e4041$0$17447$426a34cc@news.free.fr> <hmlte9$d0f$1@dough.gmane.org>
	<mailman.205.1267633968.23598.python-list@python.org>
	<4b8e9660$0$21812$426a34cc@news.free.fr>
	<hmmrh4$644$1@newsreader3.netcologne.de> <4B8EF717.3070701@optimum.net>
	<4b902338$0$31260$607ed4bc@cv.net>
	<4b90f5eb$0$9148$426a74cc@news.free.fr>
	<4b911ee0$0$4988$607ed4bc@cv.net> <4B97B092.4060901@optimum.net>
Message-ID: <op.u9dqsgf1x6zn5v@lepton.softlabbsas.com.ar>

En Wed, 10 Mar 2010 11:45:38 -0300, John Posner <jjposner at optimum.net>
escribi?:

> As I promised/threatened, here's the *start* of a write-up on  
> properties, aimed at non-advanced Python programmers:
>
>    http://www.jjposner.net/media/python-properties-0310.pdf

I'd use 'function' instead of 'procedure', as this last word is very
uncommon in Python literature (also, "the procedure's return value..." may
look very strange to some people).

I'm unsure if one should make a distinction 'storage attribute' vs.
'method attribute', or even if it makes things actually more clear. I
think you could present the motivating idea first ("I want to execute some
code when accessing an attribute") and only later talk about properties
and descriptors (as written, the reader still doesn't know how to define a
simple property and you've already talked about deleting attributes...)

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Wed Mar 10 20:38:09 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 10 Mar 2010 22:38:09 -0300
Subject: Python Script to get Info from Site not working
References: <993c3089-0f96-4f37-b42a-111731045b2d@k24g2000pro.googlegroups.com>
Message-ID: <op.u9dqtv2hx6zn5v@lepton.softlabbsas.com.ar>

En Wed, 10 Mar 2010 20:06:41 -0300, Jimbo <nilly16 at yahoo.com> escribi?:

> I found a semi Python & internet tutorial here if anyone else would
> like it http://www.upriss.org.uk/python/session6.html
>
> My script is meant to find which radio button is selected & tell me
> that. But it just keeps saying "No Drink Selected!"

Are you sure? From the code you posted, the message should read "You need  
to select a drink!", not that one.

> if drink == "tea":
>     print("You requested tea.")
> elif drink == "coffee":
>     print("You requested coffee.")
> elif drink == "hot chocolate":
>     print ("You requested hot chocolate.")
> else:
>     print ("You need to select a drink!")

Replace the last line with something like this, to see what you are  
getting exactly:

        print("Sorry, no %r (%r) available." % (
           drink,
           cgi.escape(repr(type(drink)))))

BTW, which Python version are you using? The tutorial you linked to is  
aimed at Python 2.x, but your print syntax suggests you're using Python 3.x

-- 
Gabriel Genellina



From wuwei23 at gmail.com  Wed Mar 10 21:16:04 2010
From: wuwei23 at gmail.com (alex23)
Date: Wed, 10 Mar 2010 18:16:04 -0800 (PST)
Subject: Interacting With Another Script
References: <4dc0cfea1003100432h2495ede1vf5e5bd75172ab5ea@mail.gmail.com> 
	<mailman.559.1268238673.23598.python-list@python.org>
Message-ID: <2db4409d-d8d7-4af9-a9a7-e8071bc30b0f@o16g2000prh.googlegroups.com>

Victor Subervi <victorsube... at gmail.com> wrote:
> > There's a program (vpopmail) that has commands which, when called, request
> > input ("email address", "password", etc.) from the command line. I would
> > like to build a TTW interface for my clients to use that interacts with
> > these commands.

The Pexpect[1] module is pretty much aimed at doing exactly this.

1: http://www.noah.org/wiki/Pexpect



From nilly16 at yahoo.com  Wed Mar 10 21:26:05 2010
From: nilly16 at yahoo.com (Jimbo)
Date: Wed, 10 Mar 2010 18:26:05 -0800 (PST)
Subject: Python Script to get Info from Site not working
References: <993c3089-0f96-4f37-b42a-111731045b2d@k24g2000pro.googlegroups.com>
	<mailman.592.1268273109.23598.python-list@python.org>
Message-ID: <396ffb5b-8548-4e4d-8245-a53ecb3cff23@k24g2000pro.googlegroups.com>

On Mar 11, 12:38?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Wed, 10 Mar 2010 20:06:41 -0300, Jimbo <nill... at yahoo.com> escribi?:
>
> > I found a semi Python & internet tutorial here if anyone else would
> > like ithttp://www.upriss.org.uk/python/session6.html
>
> > My script is meant to find which radio button is selected & tell me
> > that. But it just keeps saying "No Drink Selected!"
>
> Are you sure? From the code you posted, the message should read "You need ?
> to select a drink!", not that one.

> Replace the last line with something like this, to see what you are ?
> getting exactly:
>
> ? ? ? ? print("Sorry, no %r (%r) available." % (
> ? ? ? ? ? ?drink,
> ? ? ? ? ? ?cgi.escape(repr(type(drink)))))
>
> BTW, which Python version are you using? The tutorial you linked to is ?
> aimed at Python 2.x, but your print syntax suggests you're using Python 3.x
>
> --
> Gabriel Genellina

Yeah that("You need to select a drink!") was the string I was getting
but I should be getting hot chocolate or something else(which ever one
I have selected)

I am using 3.x, do you think I should be using something else? Also
the your code I put in does the some thing, just now it says "Sorry no
none drink available" all the time.


From dreadpiratejeff at gmail.com  Wed Mar 10 21:52:19 2010
From: dreadpiratejeff at gmail.com (J)
Date: Wed, 10 Mar 2010 21:52:19 -0500
Subject: Ideas for creating processes
In-Reply-To: <4B982535.4080000@mrabarnett.plus.com>
References: <36dec4ff1003101352g7d159742j2a0c76a6b0cd23fb@mail.gmail.com> 
	<4B982535.4080000@mrabarnett.plus.com>
Message-ID: <36dec4ff1003101852x1b997d5bg68be4168ce01ce34@mail.gmail.com>

On Wed, Mar 10, 2010 at 18:03, MRAB <python at mrabarnett.plus.com> wrote:
> Are you sure that you would gain from doing more than one at a time?
>
> The bottleneck will probably be the speed of your network connection,
> and if that's working at its maximum speed with one sync then doing
> several concurrently won't save any time. (The syncs will also be
> completing for disk I/O.)

Good point MRAB... thanks for making it.

I started to wonder the same thing, but it took me a couple hours away
from working on it and a good dinner before I saw that...

Yeah, looking at it freshly now, I agree, I think I probably would be
better off running them one at a time.

The goal is to update several directories of ISO images with nightly
builds.  I can use rsync and only download images that are changed, or
I can use zsync and only download diffs (I believe that's how it
works) which is faster anyway.

The only reason I was considering doing them all simultaneously, or in
batches at least, is that I have to update 10 - 12 ISOs daily... BUT,
now that I look at it from your perspective, yeah, it would probably
be faster overall to do them one at a time instead because of the
bottleneck.

Thanks!  That helped a lot (and probably saved me a lot of headache
later on) :-)

Cheers
Jeff


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 10 22:18:47 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 11 Mar 2010 03:18:47 GMT
Subject: Can't define __call__ within __init__?
References: <mailman.544.1268226754.23598.python-list@python.org>
Message-ID: <pan.2010.03.11.03.18.47@REMOVE.THIS.cybersource.com.au>

On Wed, 10 Mar 2010 08:12:14 -0500, Neal Becker wrote:

> Want to switch __call__ behavior.  Why doesn't this work?  What is the
> correct way to write this?
> 
> class X (object):
>     def __init__(self, i):
>         if i == 0:
>             def __call__ (self):
>                 return 0
>         else:
>             def __call_ (self):
>                 return 1


Others have already pointed out that there are two reasons that won't 
work: 

(1) you define __call__ as a local variable of the __init__ method which 
then disappears as soon as the __init__ method completes; and

(2) special methods like __call__ are only called on the class, not the 
instance, so you can't give each instance its own method.


Perhaps the best way to solve this is to use delegation:


def zero_returner():
    return 0

def one_returner():
    return 1


class X (object):
    def __init__(self, i):
        if i == 0:
            self.func = zero_returner
        else:
            self.func = one_returner
    def __call__(self, *args, **kwargs):
        return self.func(*args, **kwargs)


zero_returner and one_returner can be any callable object, not 
necessarily a function.

Of course, all this assumes that your solution isn't even simpler:

class X (object):
    def __init__(self, i):
        self.i = i
    def __call__(self):
        return self.i

but I assume if it was that simple, you would have done that already.



-- 
Steven


From tjreedy at udel.edu  Wed Mar 10 23:44:49 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 10 Mar 2010 23:44:49 -0500
Subject: Knight's tour Warndorff's algorithm problem
In-Reply-To: <hn945v$3me$4@lust.ihug.co.nz>
References: <mailman.527.1268199449.23598.python-list@python.org>
	<hn945v$3me$4@lust.ihug.co.nz>
Message-ID: <hn9sg1$qha$1@dough.gmane.org>

On 3/10/2010 4:49 PM, Lawrence D'Oliveiro wrote:
> In message<mailman.527.1268199449.23598.python-list at python.org>, Gabriel
> Genellina wrote:
>
>> Warnsdorff's algorithm is heuristic ...
>
> Then it shouldn?t be called an ?algorithm?.

Heuristic algorithms correctly compute some function, just not the one 
you want ;-).




From radhakrishna12 at gmail.com  Wed Mar 10 23:47:30 2010
From: radhakrishna12 at gmail.com (Radhakrishna Bhat)
Date: Thu, 11 Mar 2010 10:17:30 +0530
Subject: Get a method instance through 'getattr' but not superclass's method
Message-ID: <e28756ee1003102047i2f60dbbev708e1cfa7a240f7f@mail.gmail.com>

I am using getattr to get a method instance from a class. But it also
returns methods from the superclass. How to detect if an attribute is from
superclass?


-Radhakrishna
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From efiish at gmail.com  Wed Mar 10 23:56:48 2010
From: efiish at gmail.com (Lan Qing)
Date: Thu, 11 Mar 2010 12:56:48 +0800
Subject: a newbie's question
In-Reply-To: <8c7f10c61003090600u692bfd8sdc287a73425ed47e@mail.gmail.com>
References: <ee9ad2071003090551v5def00c6jd04eef99f4545d20@mail.gmail.com>
	<8c7f10c61003090600u692bfd8sdc287a73425ed47e@mail.gmail.com>
Message-ID: <ee9ad2071003102056m1e0587f7wcaf249d01bc22cc5@mail.gmail.com>

hi Cheers,
     Think you, that helps me a lot.

On Tue, Mar 9, 2010 at 10:00 PM, Simon Brunning <simon at brunningonline.net>wrote:

> On 9 March 2010 13:51, Lan Qing <efiish at gmail.com> wrote:
> > Hi all,
> >       I'm a newbie of python programming language.
>
> Welcome!
>
> > I have used c/c++ for 5
> > years, and one year experience in Lua programming language. Can any one
> give
> > me some advice on learning python. Think you for any help!!
>
> You'll find some useful starting points here -
> <http://wiki.python.org/moin/BeginnersGuide/Programmers>.
>
> --
> Cheers,
> Simon B.
>
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From anand.shashwat at gmail.com  Thu Mar 11 00:28:01 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Thu, 11 Mar 2010 10:58:01 +0530
Subject: a newbie's question
In-Reply-To: <ee9ad2071003102056m1e0587f7wcaf249d01bc22cc5@mail.gmail.com>
References: <ee9ad2071003090551v5def00c6jd04eef99f4545d20@mail.gmail.com> 
	<8c7f10c61003090600u692bfd8sdc287a73425ed47e@mail.gmail.com> 
	<ee9ad2071003102056m1e0587f7wcaf249d01bc22cc5@mail.gmail.com>
Message-ID: <d4ab53de1003102128pb41ae35h432b344d2628c58e@mail.gmail.com>

Python is one language which is quite easy to get grasp of. one week and
you'll start doing productive stuff. Best of luck on your quest.

On Thu, Mar 11, 2010 at 10:26 AM, Lan Qing <efiish at gmail.com> wrote:

> hi Cheers,
>      Think you, that helps me a lot.
>
>
> On Tue, Mar 9, 2010 at 10:00 PM, Simon Brunning <simon at brunningonline.net>wrote:
>
>> On 9 March 2010 13:51, Lan Qing <efiish at gmail.com> wrote:
>> > Hi all,
>> >       I'm a newbie of python programming language.
>>
>> Welcome!
>>
>> > I have used c/c++ for 5
>> > years, and one year experience in Lua programming language. Can any one
>> give
>> > me some advice on learning python. Think you for any help!!
>>
>> You'll find some useful starting points here -
>> <http://wiki.python.org/moin/BeginnersGuide/Programmers>.
>>
>> --
>> Cheers,
>> Simon B.
>>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From sivaits4u at gmail.com  Thu Mar 11 00:40:14 2010
From: sivaits4u at gmail.com (Bujji)
Date: Thu, 11 Mar 2010 11:10:14 +0530
Subject: use of multiple versions of python
Message-ID: <581ce2791003102140t7fd470e5obcad20ec714f60f3@mail.gmail.com>

hi all,
I have installed python 2.6 in addition to python 2.5 in my system
Now for some modules(while installing ) it needs to use python 2.6
how can i do that
in case of easy_install what should i do to it to use python 2.6

from my understanding /usr/bin/python is the one which will be taking care
of version. but with this only one version of python can run even though we
have tow versions.

please post some solution for my problem.
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From lacrima.maxim at gmail.com  Thu Mar 11 00:48:45 2010
From: lacrima.maxim at gmail.com (Lacrima)
Date: Wed, 10 Mar 2010 21:48:45 -0800 (PST)
Subject: Can't install ssl for Python2.5
References: <3c0d84fc-1975-4937-9b65-88535e699999@u9g2000yqb.googlegroups.com>
	<hn92kq$fgb$1@online.de>
Message-ID: <b50979f7-94aa-4db1-b3e2-6b36522293c9@a18g2000yqc.googlegroups.com>

On Mar 10, 11:23?pm, "Martin v. Loewis" <mar... at v.loewis.de> wrote:
> > I don't know how to solve this problem and I am looking forward for
> > help.
>
> Try running "python setup.py install" directly, after downloading and
> unpacking the package.
>
> Regards,
> Martin

Thanks a lot! It helped!


From richardbp at gmail.com  Thu Mar 11 01:22:56 2010
From: richardbp at gmail.com (Richard)
Date: Wed, 10 Mar 2010 22:22:56 -0800 (PST)
Subject: os.rename [Errno 31] Too many links
References: <253f4908-1cb9-4165-bf01-1d89b39d3b35@k6g2000prg.googlegroups.com>
	<7vpugdF5bqU1@mid.individual.net>
Message-ID: <1082952b-5dc0-4efa-b47f-9ada9aa7980f@x23g2000prd.googlegroups.com>

On Mar 11, 3:08?am, Thomas Guettler <h... at tbz-pariv.de> wrote:
> Richard wrote:
> > I want to atomically write to a file so have been using temporary
> > files and renaming:
>
> > temp = tempfile.NamedTemporaryFile(delete=False)
> > temp.file.write(data)
> > temp.file.close()
> > os.rename(temp.name, output_file)
>
> > This worked but after 39567 files os.rename raises an OSError: [Errno
> > 31] Too many links
>
> > I can still create files in this directory so I doubt it is a platform
> > limitation.
> > Can you tell what is wrong? Am I not freeing the temporary file
> > resources properly?
>
> If you are on linux you can have a look at the open file descriptors of
> a running process like this:
>
> ls -l /proc/PID/fd/
>
> But I guess it is a limitation of your filesystem. What do you use?
>
> I once had this problem with ext2. It has a low limit for
> subdirectories.
>
> With xfs the limits are much greater.
>
> ? Thomas
>
> --
> Thomas Guettler,http://www.thomas-guettler.de/
> E-Mail: guettli (*) thomas-guettler + de


I am using Ubuntu 9.10 with ext3, which I believe has a limit for the
number of subdirectories but not files.

Thanks for the open file descriptor tip - I will check that out.

Richard


From stefan_ml at behnel.de  Thu Mar 11 02:53:51 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Thu, 11 Mar 2010 08:53:51 +0100
Subject: Anything like "Effective Java" for Python?
In-Reply-To: <4B97CCDF.7070802@simplistix.co.uk>
References: <hn8d98$m0d$1@reader1.panix.com>
	<4B97CCDF.7070802@simplistix.co.uk>
Message-ID: <hna7ig$lq2$1@dough.gmane.org>

Chris Withers, 10.03.2010 17:46:
> kj wrote:
>> Subject line pretty much says it all: is there a book like "Effective
>> Java"
>
> oxymoronic, no?
>
> Sorry, couldn't resist ;-)

Nothing to excuse for. I thought exactly the same thing.

Stefan



From james.harris.1 at googlemail.com  Thu Mar 11 03:30:02 2010
From: james.harris.1 at googlemail.com (James Harris)
Date: Thu, 11 Mar 2010 00:30:02 -0800 (PST)
Subject: Anything like "Effective Java" for Python?
References: <hn8d98$m0d$1@reader1.panix.com>
Message-ID: <62192fd8-2350-49c5-aeea-c8fe14878a61@d2g2000yqa.googlegroups.com>

On 10 Mar, 15:19, kj <no.em... at please.post> wrote:
> Subject line pretty much says it all: is there a book like "Effective
> Java" for Python. ?I.e. a book that assumes that readers are
> experienced programmers that already know the basics of the language,
> and want to focus on more advanced programming issues?

I don't know about the Java book you mention but I find Python in a
Nutshell published by O'Reilly to be a good reference.

James


From stava at telcotec.se  Thu Mar 11 03:43:50 2010
From: stava at telcotec.se (Lars Stavholm)
Date: Thu, 11 Mar 2010 14:13:50 +0530
Subject: pexpect and logging integration
In-Reply-To: <4B97A7BD.6050003@sequans.com>
References: <4B972EA7.50807@telcotec.se> <4B97A7BD.6050003@sequans.com>
Message-ID: <4B98AD46.6090702@telcotec.se>

It works like a charm, thank you!
/Lars

Jean-Michel Pichavant wrote:
> Lars Stavholm wrote:
>> Hi all,
>>
>> has anyone managed to integrate pexpect and logging?
>>
>> I.e., I'd like to be able to pick up the dialog,
>> commands sent and responses received, in my logging.
>> I know about the pexpect logfile, and I can log things
>> to stdout or stderr, but I really need to log using the
>> python logging library.
>>
>> Any thoughts appreciated
>> /Lars
>>
>>   
> I had to implement this.
> It's a bit of a hack, but it does the job.
> 
> The following code is tested with python 2.5, I remember pexpect behaves
> slightly differently in python 2.3.
> 
> import logging
> import pexpect
> import re
> 
> # this will be the method called by the pexpect object to log
> def _write(*args, **kwargs):
>    content = args[0]
>    # let's ignore other params, pexpect only use one arg AFAIK
>    if content in [' ', '', '\n', '\r', '\r\n']:
>        return # don't log empty lines
>    for eol in ['\r\n', '\r', '\n']:
>        # remove ending EOL, the logger will add it anyway
>        content = re.sub('\%s$' % eol, '', content)
>    return logger.info(content) # call the logger info method with the
> reworked content
> 
> 
> # our flush method
> def _doNothing():
>    pass
> 
> # get the logger
> logger = logging.getLogger('foo')
> 
> # configure the logger
> logger.handlers=[]
> logger.addHandler(logging.StreamHandler())
> logger.handlers[-1].setFormatter(logging.Formatter("%(asctime)s -
> %(name)s - %(levelname)s - %(message)s"))
> logger.setLevel(logging.INFO)
> 
> # give the logger the methods required by pexpect
> logger.write = _write
> logger.flush = _doNothing
> 
> p = pexpect.spawn('echo "hello world !!"', logfile=logger)
> p.expect('!!')
> 
> ... 2010-03-10 15:01:31,234 - foo - INFO - hello world !!
> 
> Hope it helps.
> 
> JM
> 
> 




From mihir3445 at gmail.com  Thu Mar 11 04:12:02 2010
From: mihir3445 at gmail.com (Mihir Patel)
Date: Thu, 11 Mar 2010 01:12:02 -0800 (PST)
Subject: EOFError: EOF when reading a line
Message-ID: <aaf3117e-8612-43f7-82dd-dcb628db5fd0@l12g2000prg.googlegroups.com>

I am trying to use the subprocess to send the data to child process. I
am not sure why i keep getting  "EOFError: EOF when reading a line"

i am using Python 2.4.3, GCC 4.1.2 20080704 (Red Hat 4.1.2-46)] on
64bit linux ,centos

Thanks

output :
=====
Traceback (most recent call last):
  File "test_input.py", line 3, in ?
    x = raw_input()
EOFError: EOF when reading a line
output: hello



Main Program:
===========

command_line = 'python test_input.py'
p =subprocess.Popen(command_line, shell=True, stdin=subprocess.PIPE,
stdout=subprocess.PIPE)
print 'output:', p.communicate()[0]

o,e = p.communicate('test')

print "out:",o
print "error:",e
p.stdout.close()

print "Exit Success"



test_input.py
==========
print 'hello\n'

x = raw_input()

print x


From jitu.icfai at gmail.com  Thu Mar 11 04:32:18 2010
From: jitu.icfai at gmail.com (jitendra gupta)
Date: Thu, 11 Mar 2010 15:02:18 +0530
Subject: Behavior of default parameter in a function
Message-ID: <ad2372b71003110132g74e2b621h26c5c59aea5ac657@mail.gmail.com>

def foo(x = [0]):
x[0] = x[0] + 1
return x[0]

def soo(x = None):
if x is None:
x = [0]
x[0] = x[0] + 1
return x[0]

>>> foo()
1
>>>foo()  #See the behavior incremented by one
2
>>>foo([1]) # but here based on given number
2
>>>foo()
3
>>>foo([1])
2
>>>foo()
4

>>>soo()
1
>>>soo()
1
>>>soo([1])
2
>>>soo()
1

Why foo() is incremented by 1 always when we are not passing any argument,
 but this is not happening in soo() case, In which scenario we will use
these type of  function.'

Thanks
Jitendra Kumar
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From shashank.sunny.singh at gmail.com  Thu Mar 11 04:40:43 2010
From: shashank.sunny.singh at gmail.com (Shashank Singh)
Date: Thu, 11 Mar 2010 15:10:43 +0530
Subject: Behavior of default parameter in a function
In-Reply-To: <ad2372b71003110132g74e2b621h26c5c59aea5ac657@mail.gmail.com>
References: <ad2372b71003110132g74e2b621h26c5c59aea5ac657@mail.gmail.com>
Message-ID: <332972a21003110140h4f83acbp55a0c75ced584ace@mail.gmail.com>

quoting from docs:http://docs.python.org/reference/compound_stmts.html

*Default parameter values are evaluated when the function definition is
executed.* This means that the expression is evaluated once, when the
function is defined, and that that same ?pre-computed? value is used for
each call. This is especially important to understand when a default
parameter is a mutable object, such as a list or a dictionary: if the
function modifies the object (e.g. by appending an item to a list), the
default value is in effect modified

so default object for x in foo is precomputed once and is modified with each
call.

hth
--shashank

On Thu, Mar 11, 2010 at 3:02 PM, jitendra gupta <jitu.icfai at gmail.com>wrote:

>
> def foo(x = [0]):
> x[0] = x[0] + 1
>  return x[0]
>
> def soo(x = None):
> if x is None:
> x = [0]
> x[0] = x[0] + 1
>  return x[0]
>
> >>> foo()
> 1
> >>>foo()  #See the behavior incremented by one
> 2
> >>>foo([1]) # but here based on given number
> 2
> >>>foo()
> 3
> >>>foo([1])
> 2
> >>>foo()
> 4
>
> >>>soo()
> 1
> >>>soo()
> 1
> >>>soo([1])
> 2
> >>>soo()
> 1
>
> Why foo() is incremented by 1 always when we are not passing any argument,
>  but this is not happening in soo() case, In which scenario we will use
> these type of  function.'
>
> Thanks
> Jitendra Kumar
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


-- 
Regards
Shashank Singh
Senior Undergraduate, Department of Computer Science and Engineering
Indian Institute of Technology Bombay
shashank.sunny.singh at gmail.com
http://www.cse.iitb.ac.in/~shashanksingh
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From george.sakkis at gmail.com  Thu Mar 11 05:21:51 2010
From: george.sakkis at gmail.com (George Sakkis)
Date: Thu, 11 Mar 2010 11:21:51 +0100
Subject: Multiple import of the same module under different names
Message-ID: <91ad5bf81003110221m5e383f8fkc7959aa2887927eb@mail.gmail.com>

The import mechanism is not very smart in identifying whether two
modules imported under different name are actually the same module, at
least when dealing with implicit relative imports and sys.path
manipulation. However, at least in cases of plain file modules, the
module's __file__ would be adequate (or at least better than __name__)
in determining this. Below is an illustration of the different
situations (absolute imports, explicit relative imports, implicit
relative import, sys.path tweaking). So why does not import consult
__file__ before deciding to create a new module instance ?

George


=== File structure =============

~/pkg/
   __init__.py  # empty
   mod1.py
   mod2.py
   mod3.py
   mod4.py
   main.py
   subpkg/
      __init__.py  # empty
      foo.py # empty

=== Run  =============

~$ PYTHONPATH=. python pkg/main.py

=== Output  =============

Imported foo from pkg.subpkg:	<module 'pkg.subpkg.foo' from
'/home/george/pkg/subpkg/foo.py'>
Imported foo from subpkg:		<module 'subpkg.foo' from
'/home/george/pkg/subpkg/foo.pyc'>
Imported foo from pkg.mod1:	<module 'pkg.subpkg.foo' from
'/home/george/pkg/subpkg/foo.py'>
Imported foo from mod1:		<module 'subpkg.foo' from
'/home/george/pkg/subpkg/foo.pyc'>
Imported foo from pkg.mod2:	<module 'pkg.subpkg.foo' from
'/home/george/pkg/subpkg/foo.py'>
Failed to import foo from mod2:    Attempted relative import in non-package
Imported foo from pkg.mod3:	<module 'pkg.subpkg.foo' from
'/home/george/pkg/subpkg/foo.py'>
Imported foo from mod3:		<module 'pkg.subpkg.foo' from
'/home/george/pkg/subpkg/foo.py'>
Imported foo from pkg.mod4:	<module 'foo' from
'/home/george/pkg/subpkg/foo.pyc'>
Imported foo from mod4:		<module 'foo' from '/home/george/pkg/subpkg/foo.pyc'>

* 9 total module(s)
* 3 distinct module(s)
	<module 'subpkg.foo' from '/home/george/pkg/subpkg/foo.pyc'>
	<module 'pkg.subpkg.foo' from '/home/george/pkg/subpkg/foo.py'>
	<module 'foo' from '/home/george/pkg/subpkg/foo.pyc'>
* 1 distinct file(s)
	/home/george/pkg/subpkg/foo.py

=== Code  =============

### mod1.py ###
# implicit relative import
from subpkg import foo

### mod2.py ###
# explicit relative import
from .subpkg import foo

### mod3.py ###
# absolute import
from pkg.subpkg import foo

### mod4.py ###
# absolute import after tweaking sys.path
import sys
from os.path import dirname,join
sys.path.append(join(dirname(__file__), 'subpkg'))
import foo

### main.py ###
#!/usr/bin/env python

from os.path import abspath, normpath

def test(*modules):
    module_set = set(modules)
    file_set = set(module_file(m) for m in modules)
    print '* %d total module(s)' % len(modules)
    print '* %d distinct module(s)' % len(module_set)
    for m in module_set:
        print '\t', m
    print '* %d distinct file(s)' % len(file_set)
    for f in file_set:
        print '\t', f

def module_file(mod):
    f = abspath(normpath(mod.__file__))
    if f.endswith('.pyc'):
        f = f[:-1]
    return f

if __name__ == '__main__':
    from pkg.subpkg import foo
    print 'Imported foo from pkg.subpkg:\t', foo
    from subpkg import foo as rel_foo
    print 'Imported foo from subpkg:\t\t', rel_foo

    from pkg.mod1 import foo as foo1
    print 'Imported foo from pkg.mod1:\t', foo1
    from mod1 import foo as rel_foo1
    print 'Imported foo from mod1:\t\t', rel_foo1

    from pkg.mod2 import foo as foo2
    print 'Imported foo from pkg.mod2:\t', foo2
    try: from mod2 import foo as rel_foo2
    except ValueError, ex:
        print 'Failed to import foo from mod2:', ex

    from pkg.mod3 import foo as foo3
    print 'Imported foo from pkg.mod3:\t', foo3
    from mod3 import foo as rel_foo3
    print 'Imported foo from mod3:\t\t', rel_foo3

    from pkg.mod4 import foo as foo4
    print 'Imported foo from pkg.mod4:\t', foo4
    from mod4 import foo as rel_foo4
    print 'Imported foo from mod4:\t\t', rel_foo4

    print
    test(foo, rel_foo,
         foo1, rel_foo1,
         foo2, # rel_foo2,
         foo3, rel_foo3,
         foo4, rel_foo4)


From Neil.Blue at biowisdom.com  Thu Mar 11 05:30:24 2010
From: Neil.Blue at biowisdom.com (Neil Blue)
Date: Thu, 11 Mar 2010 10:30:24 -0000
Subject: How to handle file uploads with http.server
In-Reply-To: <91ad5bf81003110221m5e383f8fkc7959aa2887927eb@mail.gmail.com>
References: <91ad5bf81003110221m5e383f8fkc7959aa2887927eb@mail.gmail.com>
Message-ID: <4728DC0EADB2654E8BA2A487F0CF2785AD6D2E@ws-ukexchange.internal.biowisdom.com>

Hello,

I have a basic http.server instance running (class
HTTPHandler(http.server.BaseHTTPRequestHandler), with python 3.1, and I
would like to upload files with multipart forms.

def do_POST(self):
	ctype, pdict = cgi.parse_header(self.headers['Content-Type'])
	if ctype=='multipart/form-data':
		print('parsing...')
		query=cgi.parse_multipart(self.rfile, pdict)
		print(query)

However the file never seems to finish being parsed. There are no errors,
but the call hangs at: query=cgi.parse_multipart(self.rfile, pdict)

Please can anyone offer some insight into this or somewhere else I may find
some more information.

Thanks
Neil

********************************************* 

The information contained in this message is likely to be confidential.  It is intended only for the person named above.  Any dissemination, distribution, copying, disclosure or use of this message or its contents unless authorised by BioWisdom Ltd is strictly prohibited. Any views or opinions expressed within this e-mail are those of the author and do not necessarily represent those of BioWisdom Ltd. If you have received this message in error, please immediately notify us and delete it.  Thank you.  Registered Office: BioWisdom Ltd, Harston Mill, Harston, Cambridge, CB22 7GG.  Registered in England: (GB) 3861669.  VAT registered: (GB) 750899881.  Tel: +44 (0)1223 874800, Fax: +44 (0) 1223 874801, Internet:www.biowisdom.com 

*********************************************



From jeanmichel at sequans.com  Thu Mar 11 05:44:22 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Thu, 11 Mar 2010 11:44:22 +0100
Subject: logging: local functions ==> loss of lineno
In-Reply-To: <4B980DC6.4050807@hellmutweber.de>
References: <4B980DC6.4050807@hellmutweber.de>
Message-ID: <4B98C986.10707@sequans.com>

Hellmut Weber wrote:
> Hi Vinay Sajip,
> I'm very glad discoverd your logging module ;-)
> (That's what I would have liked 25 years ago when I was working as a 
> technical software developper!)
>
> Now I'm writing just some personal tools, I like python and want to 
> use logging on a regular basis.
>
> Logging works very well giving the filename and line number of the 
> point where it is called. As long as I use the loggers directly.
> BUT when I have to wrap the logger call in some other function, I 
> always get file name and line number of the call of the logger inside 
> the wrapping function.
>
> Is there a possibility to get this information in this situation too?
>
> TIA
>
> Hellmut
>
You have to specify the file and line number by yourself, the logging 
feature can only assume that you want the line number of the logger call.

i.e.

in test.py:

import logging
import inspect

_logger = logging.getLogger(__name__)

class Foo:
    def __init__(self):
        self._logger = _logger

    def info(self, msg):     
        previousFrame = inspect.currentframe().f_back
        self._logger.info(msg, 
extra={'custom_lineno':previousFrame.f_lineno, 'custom_filename': 
previousFrame.f_code.co_filename})

if __name__ == '__main__':
    _logger.handlers=[]
    _logger.addHandler(logging.StreamHandler())
    _logger.handlers[-1].setFormatter(logging.Formatter('file 
%(custom_filename)s line %(custom_lineno)d : %(message)s'))
    _logger.setLevel(logging.DEBUG)
    foo = Foo()
    foo.info('a foo info')

In [3]: run test.py
file test.py line 20 : a foo info


note that you cannot override the logging builtin 'lineno' key with the 
extra dictionary, that is why I'm using the 'custom_lineno' key. I don't 
know why the logger forbids it though, would have been nice to override 
lineno without the need of adding a new key.

JM


From __peter__ at web.de  Thu Mar 11 06:14:08 2010
From: __peter__ at web.de (Peter Otten)
Date: Thu, 11 Mar 2010 12:14:08 +0100
Subject: logging: local functions ==> loss of lineno
References: <mailman.576.1268256192.23598.python-list@python.org>
Message-ID: <hnaj9c$i0u$02$1@news.t-online.com>

Hellmut Weber wrote:

> Logging works very well giving the filename and line number of the point
> where it is called. As long as I use the loggers directly.
> BUT when I have to wrap the logger call in some other function, I always
> get file name and line number of the call of the logger inside the
> wrapping function.
> 
> Is there a possibility to get this information in this situation too?

The official way is probably to write a custom Logger class that overrides 
the findCaller() method.

Below is a hack that monkey-patches the logging._srcfile attribute to ignore 
user-specified modules in the call stack:

$ cat wrapper.py
import logging
import os
import sys

logger = logging.getLogger()

class SrcFile(object):
    def __init__(self, exclude_files):
        self.files = set(exclude_files)
    def __eq__(self, other):
        return other in self.files

def fixname(filename):
    if filename.lower().endswith((".pyc", ".pyo")):
        filename = filename[:-4] + ".py"
    return os.path.normcase(filename)

if "--monkey" in sys.argv:
    print "patching"
    logging._srcfile = SrcFile([logging._srcfile, fixname(__file__)])

def warn(*args, **kw):
    logger.warn(*args, **kw)

$ cat main.py
import logging
logging.basicConfig(format="%(filename)s <%(lineno)s>: %(message)s")
import wrapper
wrapper.warn("foo")
wrapper.warn("bar")
wrapper.warn("baz")

$ python main.py
wrapper.py <23>: foo
wrapper.py <23>: bar
wrapper.py <23>: baz

$ python main.py --monkey
patching
main.py <4>: foo
main.py <5>: bar
main.py <6>: baz

$ python -V
Python 2.6.4

Peter


From steve at holdenweb.com  Thu Mar 11 07:37:20 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 11 Mar 2010 07:37:20 -0500
Subject: Python Script to get Info from Site not working
In-Reply-To: <396ffb5b-8548-4e4d-8245-a53ecb3cff23@k24g2000pro.googlegroups.com>
References: <993c3089-0f96-4f37-b42a-111731045b2d@k24g2000pro.googlegroups.com>	<mailman.592.1268273109.23598.python-list@python.org>
	<396ffb5b-8548-4e4d-8245-a53ecb3cff23@k24g2000pro.googlegroups.com>
Message-ID: <hnao7j$hrk$1@dough.gmane.org>

Jimbo wrote:
> On Mar 11, 12:38 pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
>> En Wed, 10 Mar 2010 20:06:41 -0300, Jimbo <nill... at yahoo.com> escribi?:
>>
>>> I found a semi Python & internet tutorial here if anyone else would
>>> like ithttp://www.upriss.org.uk/python/session6.html
>>> My script is meant to find which radio button is selected & tell me
>>> that. But it just keeps saying "No Drink Selected!"
>> Are you sure? From the code you posted, the message should read "You need  
>> to select a drink!", not that one.
> 
>> Replace the last line with something like this, to see what you are  
>> getting exactly:
>>
>>         print("Sorry, no %r (%r) available." % (
>>            drink,
>>            cgi.escape(repr(type(drink)))))
>>
>> BTW, which Python version are you using? The tutorial you linked to is  
>> aimed at Python 2.x, but your print syntax suggests you're using Python 3.x
>>
>> --
>> Gabriel Genellina
> 
> Yeah that("You need to select a drink!") was the string I was getting
> but I should be getting hot chocolate or something else(which ever one
> I have selected)
> 
> I am using 3.x, do you think I should be using something else? Also
> the your code I put in does the some thing, just now it says "Sorry no
> none drink available" all the time.

It may not seem like it, but you *are* making progress here (of a sort).

>From the information you have given us so far it appears that your call
to form.getvalue() is returning None (which is of type <type 'NoneType'>
- your browser is probably not displaying this because it sees it as a
bogus HTML tag.

Perhaps you haven't yet realised the importance of exact copy-and-paste
here. What I'd like you to do is change the line

drink = form.getvalue("drink")

to

drink = form.getfirst("drink", "No drink selected")

then have you browser display the HTML source of the response page your
program is returning and paste that into a reply to this mail.

You might also want to take a look at

  http://docs.python.org/3.1/library/cgi.html

for further information about the Python library your are trying to use.
In particular I'd recommend heeding its advice about use of the cgitb
module.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Thu Mar 11 07:42:29 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 11 Mar 2010 07:42:29 -0500
Subject: Get a method instance through 'getattr' but not superclass's
	method
In-Reply-To: <e28756ee1003102047i2f60dbbev708e1cfa7a240f7f@mail.gmail.com>
References: <e28756ee1003102047i2f60dbbev708e1cfa7a240f7f@mail.gmail.com>
Message-ID: <hnaoh7$iv9$1@dough.gmane.org>

Radhakrishna Bhat wrote:
> I am using getattr to get a method instance from a class. But it also
> returns methods from the superclass. How to detect if an attribute is
> from superclass? 
> 
You could try, if x is in instance, looking to see whether the name is
defined in x.__class__.__dict__.

>>> class A:
...   def method1(self):
...       print "A1"
...   def method2(self):
...       print "A2"
...
>>> class B(A):
...   def method2(self):
...       print"B2"
...   def method3(self):
...       print "B3"
...
>>> a = A()
>>> b = B()
>>> b.method2()
B2
>>> b.method1()
A1
>>> b.method3()
B3
>>> b.__class__.__dict__
{'__module__': '__main__', 'method2': <function method2 at 0x7ff1d6bc>,
'method3': <function method3 at 0x7ff1d3ac>, '__doc__': None}
>>> a.__class__.__dict__
{'__module__': '__main__', 'method2': <function method2 at 0x7ff1d064>,
'__doc__': None, 'method1': <function method1 at 0x7ff1d6f4>}
>>>

I'd be interested to know why this is so important.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From ndbecker2 at gmail.com  Thu Mar 11 07:56:59 2010
From: ndbecker2 at gmail.com (Neal Becker)
Date: Thu, 11 Mar 2010 07:56:59 -0500
Subject: Can't define __call__ within __init__?
References: <mailman.544.1268226754.23598.python-list@python.org>
	<pan.2010.03.11.03.18.47@REMOVE.THIS.cybersource.com.au>
Message-ID: <hnapas$kk4$2@dough.gmane.org>

Steven D'Aprano wrote:

> On Wed, 10 Mar 2010 08:12:14 -0500, Neal Becker wrote:
> 
>> Want to switch __call__ behavior.  Why doesn't this work?  What is the
>> correct way to write this?
>> 
>> class X (object):
>>     def __init__(self, i):
>>         if i == 0:
>>             def __call__ (self):
>>                 return 0
>>         else:
>>             def __call_ (self):
>>                 return 1
> 
> 
> Others have already pointed out that there are two reasons that won't
> work:
> 
> (1) you define __call__ as a local variable of the __init__ method which
> then disappears as soon as the __init__ method completes; and
> 
> (2) special methods like __call__ are only called on the class, not the
> instance, so you can't give each instance its own method.
> 
> 
> Perhaps the best way to solve this is to use delegation:
> 
> 
> def zero_returner():
>     return 0
> 
> def one_returner():
>     return 1
> 
> 
> class X (object):
>     def __init__(self, i):
>         if i == 0:
>             self.func = zero_returner
>         else:
>             self.func = one_returner
>     def __call__(self, *args, **kwargs):
>         return self.func(*args, **kwargs)
> 
> 
> zero_returner and one_returner can be any callable object, not
> necessarily a function.
> 
> Of course, all this assumes that your solution isn't even simpler:
> 
> class X (object):
>     def __init__(self, i):
>         self.i = i
>     def __call__(self):
>         return self.i
> 
> but I assume if it was that simple, you would have done that already.
> 
> 
> 
The example I showed was just a toy problem.  The real problem is
I expect to call a function many times, and I want to avoid the overhead of 
the 'if blah' everytime.



From paskari007 at yahoo.ca  Thu Mar 11 07:58:35 2010
From: paskari007 at yahoo.ca (PEYMAN ASKARI)
Date: Thu, 11 Mar 2010 04:58:35 -0800 (PST)
Subject: a newbie's question
In-Reply-To: <ee9ad2071003102056m1e0587f7wcaf249d01bc22cc5@mail.gmail.com>
Message-ID: <493846.1798.qm@web30003.mail.mud.yahoo.com>

Hello

I need some help dynamically reloading modules. As it turns out, it is not as simple as calling reload, as outlined here
http://pyunit.sourceforge.net/notes/reloading.html

Is there builtin support for this? The example they gave does not seem to work for me, and I am unclear as to what PyUnit is.

Thanks


Peyman

--- On Thu, 3/11/10, Lan Qing <efiish at gmail.com> wrote:

From: Lan Qing <efiish at gmail.com>
Subject: Re: a newbie's question
To: "Python List" <python-list at python.org>
Received: Thursday, March 11, 2010, 4:56 AM

hi Cheers,?? ? Think you, that helps me a lot.

On Tue, Mar 9, 2010 at 10:00 PM, Simon Brunning <simon at brunningonline.net> wrote:

On 9 March 2010 13:51, Lan Qing <efiish at gmail.com> wrote:


> Hi all,

> ?? ? ?I'm a newbie of python programming language.



Welcome!



> I have used c/c++ for 5

> years, and one year experience in Lua programming language. Can any one give

> me some advice on learning python. Think you for any help!!



You'll find some useful starting points here -

<http://wiki.python.org/moin/BeginnersGuide/Programmers>.



--

Cheers,

Simon B.




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From jeanmichel at sequans.com  Thu Mar 11 08:10:40 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Thu, 11 Mar 2010 14:10:40 +0100
Subject: a newbie's question
In-Reply-To: <493846.1798.qm@web30003.mail.mud.yahoo.com>
References: <493846.1798.qm@web30003.mail.mud.yahoo.com>
Message-ID: <4B98EBD0.8020902@sequans.com>

PEYMAN ASKARI wrote:
> Hello
>
> I need some help dynamically reloading modules. As it turns out, it is 
> not as simple as calling reload, as outlined here
> http://pyunit.sourceforge.net/notes/reloading.html
>
> Is there builtin support for this? The example they gave does not seem 
> to work for me, and I am unclear as to what PyUnit is.
>
> Thanks
>
>
> Peyman
>

Please don't top post.
As for your question, there's no built-in method to reload a module 
because it is not possible (in a generic manner).

However if you *really* want to do it you can do it for your particular 
module (and only for this one).
It is tough to explain though. You have to know perfectly the python 
object model and I'm not familiar enough with it to do the explanation.

So:

1/ try to live without dynamic reload
2/ if you *really* require dynamic reload, you can try to execute the 
module in a subprocess. That way, every time you start a new subprocess, 
the last up to date version of the module is used
3/ reload the module and all it's related objects currently in memory, 
this is painfull and there are many traps to fall into. I'll let someone 
else answer this point.

JM


From radhakrishna12 at gmail.com  Thu Mar 11 08:15:19 2010
From: radhakrishna12 at gmail.com (Radhakrishna Bhat)
Date: Thu, 11 Mar 2010 18:45:19 +0530
Subject: Get a method instance through 'getattr' but not superclass's 
	method
In-Reply-To: <hnaoh7$iv9$1@dough.gmane.org>
References: <e28756ee1003102047i2f60dbbev708e1cfa7a240f7f@mail.gmail.com>
	<hnaoh7$iv9$1@dough.gmane.org>
Message-ID: <e28756ee1003110515y1b92b726k52b57c6919641806@mail.gmail.com>

Thanks. I just have to check in that string if method1 is from present in
subclass's __dict__ or not.
This is important for me because in my code, I am dynamically calling
methods of 2 classes where one is superclass of the other. And I was getting
duplicate results because of this problem.

-Radhakrishna

On Thu, Mar 11, 2010 at 6:12 PM, Steve Holden <steve at holdenweb.com> wrote:

> Radhakrishna Bhat wrote:
> > I am using getattr to get a method instance from a class. But it also
> > returns methods from the superclass. How to detect if an attribute is
> > from superclass?
> >
> You could try, if x is in instance, looking to see whether the name is
> defined in x.__class__.__dict__.
>
> >>> class A:
> ...   def method1(self):
> ...       print "A1"
> ...   def method2(self):
> ...       print "A2"
> ...
> >>> class B(A):
> ...   def method2(self):
> ...       print"B2"
> ...   def method3(self):
> ...       print "B3"
> ...
> >>> a = A()
> >>> b = B()
> >>> b.method2()
> B2
> >>> b.method1()
> A1
> >>> b.method3()
> B3
> >>> b.__class__.__dict__
> {'__module__': '__main__', 'method2': <function method2 at 0x7ff1d6bc>,
> 'method3': <function method3 at 0x7ff1d3ac>, '__doc__': None}
> >>> a.__class__.__dict__
> {'__module__': '__main__', 'method2': <function method2 at 0x7ff1d064>,
> '__doc__': None, 'method1': <function method1 at 0x7ff1d6f4>}
> >>>
>
> I'd be interested to know why this is so important.
>
> regards
>  Steve
> --
> Steve Holden           +1 571 484 6266   +1 800 494 3119
> See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
> Holden Web LLC                 http://www.holdenweb.com/
> UPCOMING EVENTS:        http://holdenweb.eventbrite.com/
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From steve at holdenweb.com  Thu Mar 11 08:30:12 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 11 Mar 2010 08:30:12 -0500
Subject: Can't define __call__ within __init__?
In-Reply-To: <hnapas$kk4$2@dough.gmane.org>
References: <mailman.544.1268226754.23598.python-list@python.org>	<pan.2010.03.11.03.18.47@REMOVE.THIS.cybersource.com.au>
	<hnapas$kk4$2@dough.gmane.org>
Message-ID: <hnaram$sv7$1@dough.gmane.org>

Neal Becker wrote:
> Steven D'Aprano wrote:
> 
>> On Wed, 10 Mar 2010 08:12:14 -0500, Neal Becker wrote:
>>
>>> Want to switch __call__ behavior.  Why doesn't this work?  What is the
>>> correct way to write this?
>>>
>>> class X (object):
>>>     def __init__(self, i):
>>>         if i == 0:
>>>             def __call__ (self):
>>>                 return 0
>>>         else:
>>>             def __call_ (self):
>>>                 return 1
>>
>> Others have already pointed out that there are two reasons that won't
>> work:
>>
>> (1) you define __call__ as a local variable of the __init__ method which
>> then disappears as soon as the __init__ method completes; and
>>
>> (2) special methods like __call__ are only called on the class, not the
>> instance, so you can't give each instance its own method.
>>
>>
>> Perhaps the best way to solve this is to use delegation:
>>
>>
>> def zero_returner():
>>     return 0
>>
>> def one_returner():
>>     return 1
>>
>>
>> class X (object):
>>     def __init__(self, i):
>>         if i == 0:
>>             self.func = zero_returner
>>         else:
>>             self.func = one_returner
>>     def __call__(self, *args, **kwargs):
>>         return self.func(*args, **kwargs)
>>
>>
>> zero_returner and one_returner can be any callable object, not
>> necessarily a function.
>>
>> Of course, all this assumes that your solution isn't even simpler:
>>
>> class X (object):
>>     def __init__(self, i):
>>         self.i = i
>>     def __call__(self):
>>         return self.i
>>
>> but I assume if it was that simple, you would have done that already.
>>
>>
>>
> The example I showed was just a toy problem.  The real problem is
> I expect to call a function many times, and I want to avoid the overhead of 
> the 'if blah' everytime.
> 
This is a premature optimization. First, make it work. Then (if it
doesn't work fast enough) make it work faster.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From astley.lejasper at gmail.com  Thu Mar 11 08:55:56 2010
From: astley.lejasper at gmail.com (Astley Le Jasper)
Date: Thu, 11 Mar 2010 05:55:56 -0800 (PST)
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
Message-ID: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>

I have a Windows 7 (64bit AMD) machine and am having quite a lot of
problems installing Reportlabs and Pil. I wondered if anyone else has
had the same issues and what the best way of dealing with it.

So far I've tried:

1. Reportlabs / Pil 32 installers - I've tried using these but they
can't find python. I also tried registering Python (http://effbot.org/
zone/python-register.htm) but this also fails.
2. Reportlabs / Pil Source - I downloaded each of these and tried to
do a "python setup.py install". However, both complain that they can't
find "vcvarsall.bat". I've done some checking and it's because the
compiler isn't present. Everyone is suggesting downloading Visual
Studio Express C++, but this only comes with the 32bit compiler. There
seems to be quite a lot of work to get 64bit VSE working on a 64bit
machine (http://jenshuebel.wordpress.com/2009/02/12/visual-c-2008-
express-edition-and-64-bit-targets/).

But before I start down that path, I wondered if anyone had any advice
(.... and no I don't mean suggesting I swap to Linux).

ALJ


From victorsubervi at gmail.com  Thu Mar 11 08:57:03 2010
From: victorsubervi at gmail.com (Victor Subervi)
Date: Thu, 11 Mar 2010 09:57:03 -0400
Subject: Interacting With Another Script
In-Reply-To: <2db4409d-d8d7-4af9-a9a7-e8071bc30b0f@o16g2000prh.googlegroups.com>
References: <4dc0cfea1003100432h2495ede1vf5e5bd75172ab5ea@mail.gmail.com>
	<mailman.559.1268238673.23598.python-list@python.org>
	<2db4409d-d8d7-4af9-a9a7-e8071bc30b0f@o16g2000prh.googlegroups.com>
Message-ID: <4dc0cfea1003110557y16ad8e65i81a136d841b7c07e@mail.gmail.com>

On Wed, Mar 10, 2010 at 10:16 PM, alex23 <wuwei23 at gmail.com> wrote:

> Victor Subervi <victorsube... at gmail.com> wrote:
> > > There's a program (vpopmail) that has commands which, when called,
> request
> > > input ("email address", "password", etc.) from the command line. I
> would
> > > like to build a TTW interface for my clients to use that interacts with
> > > these commands.
>
> The Pexpect[1] module is pretty much aimed at doing exactly this.
>
> 1: http://www.noah.org/wiki/Pexpect


THIS looks PERFECT! Thanks!
beno
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From andreengels at gmail.com  Thu Mar 11 09:14:45 2010
From: andreengels at gmail.com (Andre Engels)
Date: Thu, 11 Mar 2010 15:14:45 +0100
Subject: Can't define __call__ within __init__?
In-Reply-To: <hnaram$sv7$1@dough.gmane.org>
References: <mailman.544.1268226754.23598.python-list@python.org> 
	<pan.2010.03.11.03.18.47@REMOVE.THIS.cybersource.com.au>
	<hnapas$kk4$2@dough.gmane.org> <hnaram$sv7$1@dough.gmane.org>
Message-ID: <6faf39c91003110614v2b2aec8dg5c0c62f01fb56503@mail.gmail.com>

On Thu, Mar 11, 2010 at 2:30 PM, Steve Holden <steve at holdenweb.com> wrote:

>> The example I showed was just a toy problem. ?The real problem is
>> I expect to call a function many times, and I want to avoid the overhead of
>> the 'if blah' everytime.
>>
> This is a premature optimization. First, make it work. Then (if it
> doesn't work fast enough) make it work faster.

Corrolary: When you do make it faster, make it faster where it is slow.
Second corrolary: If making it fast is so important that these two
rules do not apply, Python is not your language of choice.


-- 
Andr? Engels, andreengels at gmail.com


From stefan_ml at behnel.de  Thu Mar 11 09:24:13 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Thu, 11 Mar 2010 15:24:13 +0100
Subject: Anything like "Effective Java" for Python?
In-Reply-To: <62192fd8-2350-49c5-aeea-c8fe14878a61@d2g2000yqa.googlegroups.com>
References: <hn8d98$m0d$1@reader1.panix.com>
	<62192fd8-2350-49c5-aeea-c8fe14878a61@d2g2000yqa.googlegroups.com>
Message-ID: <hnaued$9mp$1@dough.gmane.org>

James Harris, 11.03.2010 09:30:
> On 10 Mar, 15:19, kj<no.em... at please.post>  wrote:
>> Subject line pretty much says it all: is there a book like "Effective
>> Java" for Python.  I.e. a book that assumes that readers are
>> experienced programmers that already know the basics of the language,
>> and want to focus on more advanced programming issues?
>
> I don't know about the Java book you mention but I find Python in a
> Nutshell published by O'Reilly to be a good reference.

There's also the Python Cookbook that has a couple of useful recipes that 
can become handy at times.

http://code.activestate.com/recipes/langs/python/

Stefan



From gb345 at invalid.com  Thu Mar 11 09:57:37 2010
From: gb345 at invalid.com (gb345)
Date: Thu, 11 Mar 2010 14:57:37 +0000 (UTC)
Subject: Need advice on starting a Python group
Message-ID: <hnb0d1$2el$1@reader1.panix.com>




I'm hoping to get advice from anyone with prior experience setting
up a Python group. 

A friend of mine and I have been trying to start a
scientific-programming-oriented Python group in our school (of
medecine and bio research), with not much success.

The main problem is attendance.  Even though a *ton* of people have
told us that it's a great idea, that they're *very* interested,
and have asked to be added to our mailing list, the attendance to
our first few meeting has never been more than 5, including my
friend and I.  Last time just he and I showed up.

The second problem is getting content.  The format we'd envisioned
for this group was centered around code review (though not limited
to it).  The idea was that at every meeting a different member
would show some code.  This could be for any of a number of reasons,
such as, for example, 1) illustrate a cool module or technique; 2)
present a scientific research problem and how they used Python to
solve it, or get help solving it; 3) get general feedback (e.g. on
code clarity, software usability, module architecture, etc.).  But
in principle just about anything is OK: e.g. a talk on favorite
Python resources, or a comparison of Python with some other language,
or an overview of Python gotchas would all be fair game.

Also, we stressed that the talks were not expected to be polished:
no need for PowerPoint slides, etc.  Just project any old code onto
the screen, and talk about it, or scribble stuff on the chalkboard.

Still, we have a hard time finding volunteers.

And even when we've had volunteers, hardly anyone shows up!

Any suggestions would be appreciated.

GB

P.S.  There's a Python Meetup we could go to, but it does not fit
the bill for us: it doesn't meet often enough, it's sort of out of
the way, and has practically no one doing scientific programming.


From no.email at please.post  Thu Mar 11 10:05:30 2010
From: no.email at please.post (kj)
Date: Thu, 11 Mar 2010 15:05:30 +0000 (UTC)
Subject: Anything like "Effective Java" for Python?
References: <hn8d98$m0d$1@reader1.panix.com>
	<mailman.561.1268239578.23598.python-list@python.org>
Message-ID: <hnb0rq$7ji$1@reader1.panix.com>

In <mailman.561.1268239578.23598.python-list at python.org> Chris Withers <chris at simplistix.co.uk> writes:

>kj wrote:
>> 
>> 
>> Subject line pretty much says it all: is there a book like "Effective
>> Java" 

>oxymoronic, no?

>Sorry, couldn't resist ;-)

I hear you, but still: read "Effective Java" some day; it will make
you a better programmer, whatever your language preference.  I'm
certainly no fan of Java, but I still rank Effective Java as one
of my best reads on programming ever.  I felt that my maturity as
a programmer went up a notch or two after digesting this book.

Cheers,

~K


From philip at semanchuk.com  Thu Mar 11 10:09:08 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Thu, 11 Mar 2010 10:09:08 -0500
Subject: show image in python
In-Reply-To: <d698368f1003101403t519b5efdt94892902026aee0b@mail.gmail.com>
References: <d698368f1003101403t519b5efdt94892902026aee0b@mail.gmail.com>
Message-ID: <D2D58CB3-CF1D-4D37-8B32-01569D8BAA8F@semanchuk.com>


On Mar 10, 2010, at 5:03 PM, mohamed issolah wrote:

> Hey, This is my program
>
> 1 #!/usr/bin/python
>  2 import PIL
>  3 import numpy
>  4 import Image
>  5 import ImageOps
>  6 import sys
>  7
>  8 def Matimg(path):
>  9         """transforme image en matrice"""
> 10         Img = Image.open(str(path))
> 11         Img1 = ImageOps.grayscale(Img)
> 12         largeur,hauteur = Img1.size
> 13         imdata = Img1.getdata()
> 14         tab = numpy.array(imdata)
> 15         matrix = numpy.reshape(tab,(hauteur,largeur))
> 16         return matrix
> 17
> 18 def Creeimg():
> 19         """transforme matrice en image"""
> 20         img = Image.new ("L",(8,8))
> 21         matrix = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
> 22         img.putdata(matrix)
> 23         img.show()
> 24         img.save(fp="./ana.bmp")
> 25
> 26 if  __name__== '__main__':
> 27     if len(sys.argv) < 2 :
> 28         print "Usage: img.py <image>"
> 29         sys.exit(0)
> 30     path = sys.argv[1]
> 31     matrix = Matimg(path)
> 32     print matrix
> 33     Creeimg()
>
> My probeleme : In line 23 "img.show()" Don't work, normally I show  
> the image
> but it's not work, but strangely in line 24 "img.save(fp="./ 
> ana.bmp")" it's
> work
> WHERE IS THE PROBLEME.
>
> I have this error in shell : "(eog:3176): GLib-WARNING **: GError  
> set over
> the top of a previous GError or uninitialized memory.
> This indicates a bug in someone's code. You must ensure an error is  
> NULL
> before it's set.
> The overwriting error message was: Error in getting image file info "
>
>
> os: ubuntu 9.10

Hi issolah,
I don't know what your problem is but I have a few suggestions --
1) You say that img.show() doesn't work. How does it fail? Is that  
where you get the GLib warning?
2) I'm glad you posted your code, but because it has line numbers,  
it's awkward to copy & paste into a local example. Please show your  
code without line numbers.

I'm unfamiliar with PIL, so this is just a wild guess, but based on  
the GLib error it seems like you haven't initialized something  
properly. Sorry I couldn't be more helpful. Maybe someone who knows  
more will answer.

Good luck
Philip







From showell30 at yahoo.com  Thu Mar 11 10:16:25 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Thu, 11 Mar 2010 07:16:25 -0800 (PST)
Subject: Anything like "Effective Java" for Python?
References: <hn8d98$m0d$1@reader1.panix.com>
	<mailman.561.1268239578.23598.python-list@python.org> 
	<hnb0rq$7ji$1@reader1.panix.com>
Message-ID: <498a6d4c-3f8b-44fd-b2e0-23793031fee2@a16g2000pre.googlegroups.com>

On Mar 11, 7:05?am, kj <no.em... at please.post> wrote:
> In <mailman.561.1268239578.23598.python-l... at python.org> Chris Withers <ch... at simplistix.co.uk> writes:
>
> >kj wrote:
>
> >> Subject line pretty much says it all: is there a book like "Effective
> >> Java"
> >oxymoronic, no?
> >Sorry, couldn't resist ;-)
>
> I hear you, but still: read "Effective Java" some day; it will make
> you a better programmer, whatever your language preference. ?I'm
> certainly no fan of Java, but I still rank Effective Java as one
> of my best reads on programming ever. ?I felt that my maturity as
> a programmer went up a notch or two after digesting this book.
>

I'll second that.  I much prefer Python to Java, but Effective Java is
an excellent book.

Many of its topics would be applicable to Python, although the
solutions in Python would obviously be different.

  Eliminate obsolete object references (use None to break reference
counts)
  Avoid finalizers (use the "with" statement)
  Favor immutability
  Design method signatures carefully (including the x=[] gotcha)
  Optimize judiciously
  Don't ignore exceptions
  Avoid excessive synchronization

There are also some topics in Effective Java where the advice is
almost the opposite of Python tradition.





From CalWhoNOSPAM at roadrunner.com  Thu Mar 11 10:43:35 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Thu, 11 Mar 2010 10:43:35 -0500
Subject: I get the error:    ImportError: No module named ffnet
Message-ID: <hnb339$g2g$1@news.eternal-september.org>



I have the .py file in Eclipse
#@PydevCodeAnalysisIgnore
from ffnet import ffnet, mlgraph
topology = mlgraph( (2, 3, 1) )
nn = ffnet(topology)

I select RunAs / Python Run

I get the error
from ffnet import ffnet, mlgraph
ImportError: No module named ffnet

In the folder Python26\lib\site-packages I see
ffnet-0.6.2-py2.6.egg-info

also a folder ffnet
in that folder there is a folder Examples
If I click one of the examples pyrhon.exe opens and runs it OK.

Is there enough in the above for you to tell me how to procede?

Thanks in advance for any help at all





From kw at codebykevin.com  Thu Mar 11 10:44:12 2010
From: kw at codebykevin.com (Kevin Walzer)
Date: Thu, 11 Mar 2010 10:44:12 -0500
Subject: Anything like "Effective Java" for Python?
In-Reply-To: <hn8d98$m0d$1@reader1.panix.com>
References: <hn8d98$m0d$1@reader1.panix.com>
Message-ID: <94360$4b990fcc$4275d90a$23785@FUSE.NET>

On 3/10/10 10:19 AM, kj wrote:
> Subject line pretty much says it all: is there a book like "Effective
> Java" for Python.  I.e. a book that assumes that readers are
> experienced programmers that already know the basics of the language,
> and want to focus on more advanced programming issues?
>
> ~K
I haven't read "Effective Java," but I have found Lutz's "Programming 
Python" to be a very useful guide to solving various programming issues 
with the language. It's a big, big book, so there's lots to look at.

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


From icanbob at gmail.com  Thu Mar 11 10:54:44 2010
From: icanbob at gmail.com (bobicanprogram)
Date: Thu, 11 Mar 2010 07:54:44 -0800 (PST)
Subject: Ideas for creating processes
References: <mailman.577.1268257971.23598.python-list@python.org>
Message-ID: <0878d070-2c7a-4bdc-82eb-278432aa6695@b7g2000yqd.googlegroups.com>

On Mar 10, 4:52 pm, J <dreadpiratej... at gmail.com> wrote:
> I'm working on a project and thought I'd ask for a suggestion on how
> to proceed (I've got my own ideas, but I wanted to see if I was on the
> right track)
>
> For now, I've got this:
>
> def main():
> ## get our list of directories to refresh
>     releases=sys.argv[1:]
>     if len(releases) < 1:
>         print "You need to provide at least one dir to update"
>         sys.exit()
>
>     ## Lets figure out what there is to update
>     updateDirs = []
>     for rel in releases:
>         currentDir = os.path.join(homedir, rel)
>         for item in os.listdir(currentDir):
>             updateDirs += [os.path.join(homedir, rel, item)]
>
> which returns a list of full pathnames to directories that need to be
> updated (updates will be carried out by calling rsync or zsync
> eventually)
>
> The directory hierarchy looks like this:
>
> /home/user/files
> /home/user/files/version1
> /home/user/files/version1/type1
> /home/user/files/version1/type2
> /home/user/files/version2
> /home/user/files/version2/type1
>
> and the list ends up looking like this:
>
> ['/home/user/files/version1/type1','/home/user/files/version1/type2','/home/user/files/version2/type1','/home/user/files/version2/type2']
>
> the next thing I need to do is figure out how to update those.
>
> the quick and dirty would be (as I'm imagining it at the moment):
> for path in pathlist:
>     chdir into path
>     execute rsync or zsync
>
> but that gets me moving into one dir, updating, then moving into another.
>
> What I was wondering about though, is spawning off separate rsync
> processes to run concurrently (each rsync will hit a different remote
> dir for each local dir)
>
> so I'm trying to figure out a good way to do this:
>
> for path in pathlist:
>     kick off an individual rsync|zsync process to update path
>
> wait for all child processes to end
> exit program.
>
> I've been looking at subprocess because at the moment, that's all I
> really know...
> But is there a better way of kicking off multiple simultaneous
> processes so I can update all dirs at once instead of one at a time?
>
> No, this isn't homework, it's something I'm working on to sync a
> couple directories of ISO images to grab nightly builds
> Yes, there are plenty of pre-made scripts out there, but I don't want
> to even look at those because I figured this would be a good learning
> experience, and I want to try to solve this as much on my own as I can
> without just cut and pasting from someone elses program.
>
> So, with that said, any ideas on the best way to proceed?  I'm going
> to start looking at ways to use subprocess to do this, or would there
> be a better way (multi-threading maybe?)
>
> Or am I even in the right ballpark?
>
> Cheers
> Jeff


You might be able to use the SIMPL toolkit for this one.
(http://www.icanprogram.com/06py/lesson1/lesson1.html)

You could wrap the rsync executable as a SIMPL receiver module and
then message to that from inside your Python script to kick it off and
synchronize actions.

bob


From dvkeeney at gmail.com  Thu Mar 11 11:00:29 2010
From: dvkeeney at gmail.com (dkeeney)
Date: Thu, 11 Mar 2010 08:00:29 -0800 (PST)
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<4b90a1f8$0$1629$742ec2ed@news.sonic.net>
	<0d381135-730a-45e4-9225-9ba2a29b77fe@k2g2000pro.googlegroups.com>
	<Xns9D35C3BFCE829duncanbooth@127.0.0.1>
Message-ID: <3707bdd1-7371-445e-b303-96c2b636102d@e19g2000prn.googlegroups.com>

On Mar 8, 12:14?pm, Duncan Booth <duncan.bo... at invalid.invalid> wrote:

> You've totally missed the point. It isn't the size of the data you have
> today that matters, it's the size of data you could have in several years'
> time.
>
> Maybe today you've got 10 users each with 10 megabytes of data, but you're
> aspiring to become the next twitter/facebook or whatever. It's a bit late
> as you approach 100 million users (and a petabyte of data) to discover that
> your system isn't scalable: scalability needs to be built in from day one.

Do you have examples of sites that got big by planning their site
architecture from day 0 to be big?

Judging from published accounts, even Facebook and Twitter did not
plan to be  'the next twitter/facebook'; each started with routine
LAMP stack architecture and successfully re-engineered the
architecture multiple times on the way up.

Is there compelling reason to think the 'next twitter/facebook' can't
and won't climb a very similar path?

I see good reasons to think that they *will* follow the same path, in
that there are motivations at both ends of the path for re-engineering
as you go.  When the site is small, resources commited to the backend
are not spent on making the frontend useful, so business-wise the best
backend is the cheapest one.  When the site becomes super-large, the
backend gets re-engineered based on what that organization learned
while the site was just large; Facebook, Twitter, and Craigslist all
have architectures custom designed to support their specific needs.
Had they tried to design for large size while they were small, they
would have failed; they couldn't have known enough then about what
they would eventually need.

The only example I can find of a large site that architected large
very early is Google, and they were aiming for a market (search) that
was already known to be huge.

Its reasonable to assume that the 'next twitter/facebook' will *not*
be in web search, social-networking, broadcast instant messaging, or
classified ads, just because those niches are taken already.  So
whichever 'high-scalability' model the aspiring site uses will be the
wrong one.  They might as well start with a quick and cheap LAMP
stack, and re-engineer as they go.

Just one internet watcher's biased opinion...

David


www.rdbhost.com -> SQL databases via a web-service



From python at mrabarnett.plus.com  Thu Mar 11 11:01:41 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 11 Mar 2010 16:01:41 +0000
Subject: Can't define __call__ within __init__?
In-Reply-To: <6faf39c91003110614v2b2aec8dg5c0c62f01fb56503@mail.gmail.com>
References: <mailman.544.1268226754.23598.python-list@python.org>
	<pan.2010.03.11.03.18.47@REMOVE.THIS.cybersource.com.au>	<hnapas$kk4$2@dough.gmane.org>
	<hnaram$sv7$1@dough.gmane.org>
	<6faf39c91003110614v2b2aec8dg5c0c62f01fb56503@mail.gmail.com>
Message-ID: <4B9913E5.7060404@mrabarnett.plus.com>

Andre Engels wrote:
> On Thu, Mar 11, 2010 at 2:30 PM, Steve Holden <steve at holdenweb.com> wrote:
> 
>>> The example I showed was just a toy problem.  The real problem is
>>> I expect to call a function many times, and I want to avoid the overhead of
>>> the 'if blah' everytime.
>>>
>> This is a premature optimization. First, make it work. Then (if it
>> doesn't work fast enough) make it work faster.
> 
> Corrolary: When you do make it faster, make it faster where it is slow.
> Second corrolary: If making it fast is so important that these two
> rules do not apply, Python is not your language of choice.
> 
Addendum: a bad algorithm is bad, whatever language it's written in.


From gnarlodious at gmail.com  Thu Mar 11 11:02:59 2010
From: gnarlodious at gmail.com (Gnarlodious)
Date: Thu, 11 Mar 2010 08:02:59 -0800 (PST)
Subject: Insert missing keys using defaultdict
Message-ID: <55e00342-a83e-4e45-8448-d04e71251631@c16g2000yqd.googlegroups.com>

I am trying to grok this documentation but need help:
http://docs.python.org/library/collections.html#defaultdict-examples

In a perfect world the dict looks like this:
plistDict={'Style':'ExternalURL', 'Ref':'http://Gnarlodious.com/',
'Tip':'Opens in a new window', 'Text':'Gnarlodious.com'}

Let's say I want to prep a dict from a plist to insert the values into
an HTML link string:
"<a class='%(Style)s' href='%(Ref)s' title='%(Tip)s'>%(Text)s</a>" %
plistDict

However, in this imperfect world the dict might look like this:
plistDict={'Ref':'http://Gnarlodious.com/', 'Text':'Gnarlodious.com'}

which would error:
KeyError: 'Style'

So using defaultdict:
from collections import defaultdict

How do create a dict assigning every missing key with a default
string?

-- Gnarlie


From isso.moh at gmail.com  Thu Mar 11 11:07:39 2010
From: isso.moh at gmail.com (mohamed issolah)
Date: Thu, 11 Mar 2010 17:07:39 +0100
Subject: show image in python
In-Reply-To: <D2D58CB3-CF1D-4D37-8B32-01569D8BAA8F@semanchuk.com>
References: <d698368f1003101403t519b5efdt94892902026aee0b@mail.gmail.com>
	<D2D58CB3-CF1D-4D37-8B32-01569D8BAA8F@semanchuk.com>
Message-ID: <d698368f1003110807o2c853d34p7179d068603ba606@mail.gmail.com>

hey
#!/usr/bin/python
  2 import PIL
  3 import numpy
  4 import Image
   import ImageOps
   import sys

   def Matimg(path):
           """transforme image en matrice"""
          Img = Image.open(str(path))
          Img1 = ImageOps.grayscale(Img)
          largeur,hauteur = Img1.size
          imdata = Img1.getdata()
          tab = numpy.array(imdata)
          matrix = numpy.reshape(tab,(hauteur,largeur))
          return matrix

  def Creeimg():
          """transforme matrice en image"""
          img = Image.new ("L",(8,8))
          matrix = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
          img.putdata(matrix)
          img.show()
          img.save(fp="./ana.bmp")

  if  __name__== '__main__':
      if len(sys.argv) < 2 :
          print "Usage: img.py <image>"
          sys.exit(0)
     path = sys.argv[1]
     matrix = Matimg(path)
     print matrix
     Creeimg()


2010/3/11 Philip Semanchuk <philip at semanchuk.com>

>
> On Mar 10, 2010, at 5:03 PM, mohamed issolah wrote:
>
>  Hey, This is my program
>>
>> 1 #!/usr/bin/python
>>  2 import PIL
>>  3 import numpy
>>  4 import Image
>>  5 import ImageOps
>>  6 import sys
>>  7
>>  8 def Matimg(path):
>>  9         """transforme image en matrice"""
>> 10         Img = Image.open(str(path))
>> 11         Img1 = ImageOps.grayscale(Img)
>> 12         largeur,hauteur = Img1.size
>> 13         imdata = Img1.getdata()
>> 14         tab = numpy.array(imdata)
>> 15         matrix = numpy.reshape(tab,(hauteur,largeur))
>> 16         return matrix
>> 17
>> 18 def Creeimg():
>> 19         """transforme matrice en image"""
>> 20         img = Image.new ("L",(8,8))
>> 21         matrix = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
>> 22         img.putdata(matrix)
>> 23         img.show()
>> 24         img.save(fp="./ana.bmp")
>> 25
>> 26 if  __name__== '__main__':
>> 27     if len(sys.argv) < 2 :
>> 28         print "Usage: img.py <image>"
>> 29         sys.exit(0)
>> 30     path = sys.argv[1]
>> 31     matrix = Matimg(path)
>> 32     print matrix
>> 33     Creeimg()
>>
>> My probeleme : In line 23 "img.show()" Don't work, normally I show the
>> image
>> but it's not work, but strangely in line 24 "img.save(fp="./ana.bmp")"
>> it's
>> work
>> WHERE IS THE PROBLEME.
>>
>> I have this error in shell : "(eog:3176): GLib-WARNING **: GError set over
>> the top of a previous GError or uninitialized memory.
>> This indicates a bug in someone's code. You must ensure an error is NULL
>> before it's set.
>> The overwriting error message was: Error in getting image file info "
>>
>>
>> os: ubuntu 9.10
>>
>
> Hi issolah,
> I don't know what your problem is but I have a few suggestions --
> 1) You say that img.show() doesn't work. How does it fail? Is that where
> you get the GLib warning?
> 2) I'm glad you posted your code, but because it has line numbers, it's
> awkward to copy & paste into a local example. Please show your code without
> line numbers.
>
> I'm unfamiliar with PIL, so this is just a wild guess, but based on the
> GLib error it seems like you haven't initialized something properly. Sorry I
> couldn't be more helpful. Maybe someone who knows more will answer.
>
> Good luck
> Philip
>
>
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
issolah mohamed
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From showell30 at yahoo.com  Thu Mar 11 11:20:14 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Thu, 11 Mar 2010 08:20:14 -0800 (PST)
Subject: Can't define __call__ within __init__?
References: <mailman.544.1268226754.23598.python-list@python.org> 
	<pan.2010.03.11.03.18.47@REMOVE.THIS.cybersource.com.au>
Message-ID: <b1a8cceb-ca90-4f84-9cdf-8f07cb116a94@l24g2000prh.googlegroups.com>

On Mar 10, 7:18?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Wed, 10 Mar 2010 08:12:14 -0500, Neal Becker wrote:
> > Want to switch __call__ behavior. ?Why doesn't this work? ?What is the
> > correct way to write this?
>
> > class X (object):
> > ? ? def __init__(self, i):
> > ? ? ? ? if i == 0:
> > ? ? ? ? ? ? def __call__ (self):
> > ? ? ? ? ? ? ? ? return 0
> > ? ? ? ? else:
> > ? ? ? ? ? ? def __call_ (self):
> > ? ? ? ? ? ? ? ? return 1
>
> Others have already pointed out that there are two reasons that won't
> work:
>
> (1) you define __call__ as a local variable of the __init__ method which
> then disappears as soon as the __init__ method completes; and
>
> (2) special methods like __call__ are only called on the class, not the
> instance, so you can't give each instance its own method.
>

Are you sure about that?  This program prints 1, 2, 1, 2.

    class Foo:
        def __init__(self, a):
            if a == 1:
                self.__call__ = lambda: 1
            else:
                self.__call__ = lambda: 2

    foo1 = Foo(1)
    print foo1()

    foo2 = Foo(2)
    print foo2()

    print foo1()
    print foo2()

See here:

http://docs.python.org/reference/datamodel.html

Class instances
    Class instances are described below. Class instances are callable
only when the class has a __call__() method; x(arguments) is a
shorthand for x.__call__(arguments).


From george.sakkis at gmail.com  Thu Mar 11 11:20:47 2010
From: george.sakkis at gmail.com (George Sakkis)
Date: Thu, 11 Mar 2010 08:20:47 -0800 (PST)
Subject: Insert missing keys using defaultdict
References: <55e00342-a83e-4e45-8448-d04e71251631@c16g2000yqd.googlegroups.com>
Message-ID: <350e66eb-5c5b-4abe-826b-44a73a90053c@33g2000yqj.googlegroups.com>

On Mar 11, 5:02?pm, Gnarlodious <gnarlodi... at gmail.com> wrote:

> I am trying to grok this documentation but need help:http://docs.python.org/library/collections.html#defaultdict-examples
>
> In a perfect world the dict looks like this:
> plistDict={'Style':'ExternalURL', 'Ref':'http://Gnarlodious.com/',
> 'Tip':'Opens in a new window', 'Text':'Gnarlodious.com'}
>
> Let's say I want to prep a dict from a plist to insert the values into
> an HTML link string:
> "<a class='%(Style)s' href='%(Ref)s' title='%(Tip)s'>%(Text)s</a>" %
> plistDict
>
> However, in this imperfect world the dict might look like this:
> plistDict={'Ref':'http://Gnarlodious.com/', 'Text':'Gnarlodious.com'}
>
> which would error:
> KeyError: 'Style'
>
> So using defaultdict:
> from collections import defaultdict
>
> How do create a dict assigning every missing key with a default
> string?

"<a class='%(Style)s' href='%(Ref)s' title='%(Tip)s'>%(Text)s</a>" %
defaultdict(lambda:'_MISSING_', plistDict)

HTH,
George


From gnarlodious at gmail.com  Thu Mar 11 11:27:24 2010
From: gnarlodious at gmail.com (Gnarlodious)
Date: Thu, 11 Mar 2010 08:27:24 -0800 (PST)
Subject: Insert missing keys using defaultdict
References: <55e00342-a83e-4e45-8448-d04e71251631@c16g2000yqd.googlegroups.com>
	<350e66eb-5c5b-4abe-826b-44a73a90053c@33g2000yqj.googlegroups.com>
Message-ID: <2b32f4ae-a61d-4a5b-a085-1df16a6cea58@c16g2000yqd.googlegroups.com>

On Mar 11, 9:20?am, George Sakkis wrote:

> > How do create a dict assigning every missing key with a default
> > string?
>
> "<a class='%(Style)s' href='%(Ref)s' title='%(Tip)s'>%(Text)s</a>" %
> defaultdict(lambda:'_MISSING_', plistDict)

Brilliant, I love Python.

-- Gnarlie



From rizwanahmed24 at gmail.com  Thu Mar 11 11:28:38 2010
From: rizwanahmed24 at gmail.com (rizwanahmed24 at gmail.com)
Date: Thu, 11 Mar 2010 08:28:38 -0800 (PST)
Subject: bypass UAC control through python script (to be run from batchfile)
Message-ID: <26028cd0-8ead-47d0-95d8-09e2214dddd3@e7g2000yqf.googlegroups.com>

Hi

here is my problem.

i want to install a program through python script. The python scripts
is called from a batch file. The UAC control is not allowing the
python script to install a msi (installer). I need to somehow by pass
the UAC control. i dont want to turn it off permanently. Once i have
run the batch file, i do not interact with the system manually,
therefore Clicking allow on UAC dialog is not the solution for me.

i just want to achieve the goal, whether i run batch file in Admin
mode, or do it form python, doesnt matter.
any ideas?

//Rizwan


From robin at reportlab.com  Thu Mar 11 11:29:26 2010
From: robin at reportlab.com (Robin Becker)
Date: Thu, 11 Mar 2010 16:29:26 +0000
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
In-Reply-To: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>
Message-ID: <4B991A66.4020203@chamonix.reportlab.co.uk>

On 11/03/2010 13:55, Astley Le Jasper wrote:
> I have a Windows 7 (64bit AMD) machine and am having quite a lot of
> problems installing Reportlabs and Pil. I wondered if anyone else has
> had the same issues and what the best way of dealing with it.
>
> So far I've tried:
>
> 1. Reportlabs / Pil 32 installers - I've tried using these but they
> can't find python. I also tried registering Python (http://effbot.org/
> zone/python-register.htm) but this also fails.
> 2. Reportlabs / Pil Source - I downloaded each of these and tried to
> do a "python setup.py install". However, both complain that they can't
> find "vcvarsall.bat". I've done some checking and it's because the
> compiler isn't present. Everyone is suggesting downloading Visual
> Studio Express C++, but this only comes with the 32bit compiler. There
> seems to be quite a lot of work to get 64bit VSE working on a 64bit
> machine (http://jenshuebel.wordpress.com/2009/02/12/visual-c-2008-
> express-edition-and-64-bit-targets/).
>
> But before I start down that path, I wondered if anyone had any advice
> (.... and no I don't mean suggesting I swap to Linux).
>
> ALJ

Hi,

you might get more assistance on the reportlab users mailing list at

http://two.pairlist.net/mailman/listinfo/reportlab-users

We do have users that run both reportlab & pil on 64 bit linux architectures, 
but I don't think I have ever compiled any of the extensions for 64bit windows. 
The vcvarsall.bat reference is the distutils package desperately  looking for a 
suitable compiler (and not finding it).

Perhaps some expert on the python list knows which versions of VS support 64bit; 
I do have VS 2005/2008 etc, but I'll probably need to set up a 64bit machine to 
see if they will install on a 64bit architecture.
-- 
Robin Becker



From __peter__ at web.de  Thu Mar 11 11:36:03 2010
From: __peter__ at web.de (Peter Otten)
Date: Thu, 11 Mar 2010 17:36:03 +0100
Subject: Can't define __call__ within __init__?
References: <mailman.544.1268226754.23598.python-list@python.org>
	<pan.2010.03.11.03.18.47@REMOVE.THIS.cybersource.com.au>
	<b1a8cceb-ca90-4f84-9cdf-8f07cb116a94@l24g2000prh.googlegroups.com>
Message-ID: <hnb64u$ah4$03$1@news.t-online.com>

Steve Howell wrote:

> On Mar 10, 7:18 pm, Steven D'Aprano
> <ste... at REMOVE.THIS.cybersource.com.au> wrote:

>> (2) special methods like __call__ are only called on the class, not the
>> instance, so you can't give each instance its own method.

> Are you sure about that?  This program prints 1, 2, 1, 2.
 
You are using a classic class while the behaviour described above applies to 
newstyle classes:

>>> class Foo:
...     def __init__(self):
...             self.__call__ = lambda: 42
...
>>> Foo()()
42
>>> class Bar(object):
...     def __init__(self):
...             self.__call__ = lambda: 42
...
>>> Bar()()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'Bar' object is not callable

I don't think it's a good idea to write new code that requires a classic 
class.

Peter


From gherron at islandtraining.com  Thu Mar 11 11:48:20 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Thu, 11 Mar 2010 08:48:20 -0800
Subject: Behavior of default parameter in a function
In-Reply-To: <ad2372b71003110132g74e2b621h26c5c59aea5ac657@mail.gmail.com>
References: <ad2372b71003110132g74e2b621h26c5c59aea5ac657@mail.gmail.com>
Message-ID: <4B991ED4.1030203@islandtraining.com>

This is addressed in the FAQ.

  
http://www.python.org/doc/faq/general/#why-are-default-values-shared-between-objects

jitendra gupta wrote:
>
> def foo(x = [0]):
> x[0] = x[0] + 1
> return x[0]
>
> def soo(x = None):
> if x is None:
> x = [0]
> x[0] = x[0] + 1
> return x[0]
>
> >>> foo()
> 1
> >>>foo()  #See the behavior incremented by one 
> 2
> >>>foo([1]) # but here based on given number 
> 2
> >>>foo() 
> 3
> >>>foo([1])
> 2
> >>>foo()
> 4
>
> >>>soo()
> 1
> >>>soo()
> 1
> >>>soo([1])
> 2
> >>>soo()
> 1
>
> Why foo() is incremented by 1 always when we are not passing any argument,
>  but this is not happening in soo() case, In which scenario 
> we will use these type of  function.'
>
> Thanks 
> Jitendra Kumar
>



From CalWhoNOSPAM at roadrunner.com  Thu Mar 11 12:04:20 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Thu, 11 Mar 2010 12:04:20 -0500
Subject: I get the error:    ImportError: No module named ffnet
References: <hnb339$g2g$1@news.eternal-september.org>
Message-ID: <hnb7qn$a7s$1@news.eternal-september.org>

I ran this:
import sys

from pprint import pprint as pp

pp(sys.path)



The output included:

'E:\\Program Files\\Python26',

'E:\\Program Files\\Python26\\DLLs',

'E:\\Program Files\\Python26\\lib',

'E:\\Program Files\\Python26\\lib\\lib-tk',

'E:\\Program Files\\Python26\\lib\\plat-win',

'E:\\Program Files\\Python26\\lib\\site-packages',



Python is at

E:\Python26

but other things like java are at E:\Program Files

Showhow it is looking in the wrong place and I don't know how to fix it.

I checked the registry. The entries all look good there.



Thanks







" Cal Who" <CalWhoNOSPAM at roadrunner.com> wrote in message 
news:hnb339$g2g$1 at news.eternal-september.org...
>
>
> I have the .py file in Eclipse
> #@PydevCodeAnalysisIgnore
> from ffnet import ffnet, mlgraph
> topology = mlgraph( (2, 3, 1) )
> nn = ffnet(topology)
>
> I select RunAs / Python Run
>
> I get the error
> from ffnet import ffnet, mlgraph
> ImportError: No module named ffnet
>
> In the folder Python26\lib\site-packages I see
> ffnet-0.6.2-py2.6.egg-info
>
> also a folder ffnet
> in that folder there is a folder Examples
> If I click one of the examples pyrhon.exe opens and runs it OK.
>
> Is there enough in the above for you to tell me how to procede?
>
> Thanks in advance for any help at all
>
>
> 




From bartc at freeuk.com  Thu Mar 11 12:22:49 2010
From: bartc at freeuk.com (bartc)
Date: Thu, 11 Mar 2010 17:22:49 GMT
Subject: Named loops for breaking
In-Reply-To: <c809ceee-34ff-409c-b645-3cb833ce6f8a@g19g2000yqe.googlegroups.com>
References: <6d6a35e8-f09c-4792-8abe-5a0dc24d214e@g28g2000yqh.googlegroups.com>
	<mailman.529.1268202554.23598.python-list@python.org>
	<c809ceee-34ff-409c-b645-3cb833ce6f8a@g19g2000yqe.googlegroups.com>
Message-ID: <JF9mn.49426$Ym4.1808@text.news.virginmedia.com>

James Harris wrote:
> On 10 Mar, 06:29, "Gabriel Genellina" <gagsl-... at yahoo.com.ar> wrote:
>> En Tue, 09 Mar 2010 18:41:10 -0300, Daniel Klein <bri... at gmail.com>
>> escribi :
>>
>>> Basically I'm wondering if there are any plans to implemented named
>>> loops in Python, so I can tell a break command to break out of a
>>> specific loop in the case of nested loops.
>>
>> See PEP3136 [1] and its rejection note [2]
>> I think you may find some more discussion in the python-ideas list.

> Breaking out of an inner loop is just as natural as breaking out of
> the immediately enclosing loop. ISTM that if one is allowed the other
> should be also.

Exactly. Python already has single-level break (probably some baggage 
carried over from C), and some of the same arguments can be applied to that 
too.

Given that break does exist, it's annoying that in the followed contrived 
example:

def f(n):
        return n==2

for i in range(10):
        print i
        if f(0): break
        if f(1): break
        if f(2): break
        if f(3): break

I can't turn the list of ifs into a loop. I can use break embedded inside a 
statement inside a loop, provided it's not another loop! That's 
discrimination...

> There are often times when it *is* better to factor out the code to a
> different function but adding a function just to enable a break from
> an inner loop doesn't seem to me a good reason.

Multi-level breaks should just have been part of the language, so they are 
available to those who want them, and ignored by everyone else.

(And in languages where I've implemented them -- all generally faster than 
Python -- they have no impact on performance. I also had 4 loop controls 
rather than just 2, all multi-level, and the world hasn't ended yet.)

My experience of these break statements is that they are used infrequently 
in final code. But they are handy when developing code too: you don't want 
to waste time refactoring, and generally turning code upside-down, when the 
code has to be rewritten a dozen times anyway.

-- 
Bartc 



From mrkafk at gmail.com  Thu Mar 11 12:28:04 2010
From: mrkafk at gmail.com (mk)
Date: Thu, 11 Mar 2010 18:28:04 +0100
Subject: Anything like "Effective Java" for Python?
In-Reply-To: <hn8d98$m0d$1@reader1.panix.com>
References: <hn8d98$m0d$1@reader1.panix.com>
Message-ID: <hnb973$loh$1@dough.gmane.org>

kj wrote:
> 
> 
> Subject line pretty much says it all: is there a book like "Effective
> Java" for Python.  I.e. a book that assumes that readers are
> experienced programmers that already know the basics of the language,
> and want to focus on more advanced programming issues?

I'm surprised nobody mentioned Dive Into Python:

http://diveintopython.org/

Available for free online. Most Python books contain a lot of 'hello 
world' material which for someone who knows at least one programming 
language is boring, this one doesn't, it cuts straight to the point. I 
found it very readable.

Regards,
mk





From mehgcap at gmail.com  Thu Mar 11 12:51:57 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Thu, 11 Mar 2010 12:51:57 -0500
Subject: importing modules from subdirs
Message-ID: <bc7f680c1003110951p7d1253d9nb8b67e47f41d3970@mail.gmail.com>

Hi all,
The manual says, for modules in a project stored in subdirectories, you can do:
import folderName.module

I have a couple questions, though:
1. Do I then have to call functions from module like
folder.module.function, or can I still use the normal module.function?

2. When I try to do this, it fails. I have an sw folder. Inside that I
have a modes folder, holding weather.pyw. Main.pyw, back in the sw
folder, is trying to import modes.weather, but nothing happens. I have
tried putting weather.pyw in its own weather folder under the modes
folder, but that also fails. I have placed an empty __init__.py file
in both the modes folder and the weather subfolder, but I cannot get
main.pyw to import weather!

3. How does weather import from a folder above or beside it? For
example, if a config directory is at the same level as the modes
directory, how can weather import something from config?

Thanks!

-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From gherron at islandtraining.com  Thu Mar 11 13:00:10 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Thu, 11 Mar 2010 10:00:10 -0800
Subject: importing modules from subdirs
In-Reply-To: <bc7f680c1003110951p7d1253d9nb8b67e47f41d3970@mail.gmail.com>
References: <bc7f680c1003110951p7d1253d9nb8b67e47f41d3970@mail.gmail.com>
Message-ID: <4B992FAA.2020102@islandtraining.com>

Alex Hall wrote:
> Hi all,
> The manual says, for modules in a project stored in subdirectories, you can do:
> import folderName.module
>
> I have a couple questions, though:
> 1. Do I then have to call functions from module like
> folder.module.function, or can I still use the normal module.function?
>   

Either, depending on how you do the import:

import folder.module
folder.module.function()

or

from folder.module import function
function()

or

from folder import module
module.function()

> 2. When I try to do this, it fails. I have an sw folder. Inside that I
> have a modes folder, holding weather.pyw. Main.pyw, back in the sw
> folder, is trying to import modes.weather, but nothing happens. I have
> tried putting weather.pyw in its own weather folder under the modes
> folder, but that also fails. I have placed an empty __init__.py file
> in both the modes folder and the weather subfolder, but I cannot get
> main.pyw to import weather!
>   

Show us some code and a diagram of your forcer hierarchy, and we'll look 
at it.
> 3. How does weather import from a folder above or beside it? For
> example, if a config directory is at the same level as the modes
> directory, how can weather import something from config?
>   

You don't import from up the hierarchy.  You can put a higher folder on 
sys.path, and get to it that way.

Gary Herron


> Thanks!
>
>   



From martin at v.loewis.de  Thu Mar 11 13:00:21 2010
From: martin at v.loewis.de (Martin v. Loewis)
Date: Thu, 11 Mar 2010 19:00:21 +0100
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
In-Reply-To: <mailman.619.1268324988.23598.python-list@python.org>
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>
	<mailman.619.1268324988.23598.python-list@python.org>
Message-ID: <4B992FB5.8090207@v.loewis.de>


>> I have a Windows 7 (64bit AMD) machine

This is somewhat imprecise: is it
a) that your CPU is AMD64, and thus supports 64-bit mode, or
b) that *in addition*, your Windows 7 installation is a 64-bit
installation, or
c) that *in addition*, your Python installation is also a 64-bit
   installation.

Unless you have a specific need for 64-bit mode, I recommend that you
use the 32-bit version of Windows (unless you have more than 4GB of
main memory), and (even if you have a 64-bit Windows) you install the
32-bit version of Python on it (unless you have the need to access more
than 2GB of objects in your Python applications.

>> 1. Reportlabs / Pil 32 installers - I've tried using these but they
>> can't find python. I also tried registering Python (http://effbot.org/
>> zone/python-register.htm) but this also fails.

Install the 32-bit version of Python, and these installers should work fine.

> Perhaps some expert on the python list knows which versions of VS
> support 64bit; I do have VS 2005/2008 etc, but I'll probably need to set
> up a 64bit machine to see if they will install on a 64bit architecture.

For Python 2.6 and later, use VS 2008. This comes with an AMD64
compiler. You technically don't need a 64-bit Windows, as it supports
cross-compilation (but you would need a 64-bit Windows to test it).

I personally build Python on a 32-bit machine, and move the MSI to a
64-bit machine for testing.

Regards,
Martin


From steve at holdenweb.com  Thu Mar 11 13:10:48 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 11 Mar 2010 13:10:48 -0500
Subject: importing modules from subdirs
In-Reply-To: <bc7f680c1003110951p7d1253d9nb8b67e47f41d3970@mail.gmail.com>
References: <bc7f680c1003110951p7d1253d9nb8b67e47f41d3970@mail.gmail.com>
Message-ID: <hnbbov$v4q$1@dough.gmane.org>

Alex Hall wrote:
> Hi all,
> The manual says, for modules in a project stored in subdirectories, you can do:
> import folderName.module
> 
> I have a couple questions, though:
> 1. Do I then have to call functions from module like
> folder.module.function, or can I still use the normal module.function?
> 
> 2. When I try to do this, it fails. I have an sw folder. Inside that I
> have a modes folder, holding weather.pyw. Main.pyw, back in the sw
> folder, is trying to import modes.weather, but nothing happens. I have
> tried putting weather.pyw in its own weather folder under the modes
> folder, but that also fails. I have placed an empty __init__.py file
> in both the modes folder and the weather subfolder, but I cannot get
> main.pyw to import weather!
> 
> 3. How does weather import from a folder above or beside it? For
> example, if a config directory is at the same level as the modes
> directory, how can weather import something from config?
> 
> Thanks!
> 
I haven't checked this, but I believe .pyw names are only for main
programs. Try renaming weather.pyw as weather.py and see if it makes any
difference.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From drobinow at gmail.com  Thu Mar 11 13:14:01 2010
From: drobinow at gmail.com (David Robinow)
Date: Thu, 11 Mar 2010 13:14:01 -0500
Subject: use of multiple versions of python
In-Reply-To: <581ce2791003102140t7fd470e5obcad20ec714f60f3@mail.gmail.com>
References: <581ce2791003102140t7fd470e5obcad20ec714f60f3@mail.gmail.com>
Message-ID: <4eb0089f1003111014w4f7bffack1ea409aa7a17ac2c@mail.gmail.com>

On Thu, Mar 11, 2010 at 12:40 AM, Bujji <sivaits4u at gmail.com> wrote:
> hi all,
> I have installed python 2.6 in addition to python 2.5 in my system
> Now for some modules(while installing ) it needs to use python 2.6
> how can i do that
> in case of easy_install what should i do to it to use python 2.6
 You should have an easy_install-2.5 and easy_install-2.6.  One of
them will be linked to easy_install, depending on how you did the
install. Just use the one you need.


From mehgcap at gmail.com  Thu Mar 11 13:15:38 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Thu, 11 Mar 2010 13:15:38 -0500
Subject: unable to run wxPython script: dll errors
Message-ID: <bc7f680c1003111015n7b677737l8304efae28a8c6f8@mail.gmail.com>

Hi all,
I am trying to run a file that should pop up a dialog. The dialog is
fine (I used XRCed to create it and running it from within that editor
brings up the dialog I want). When I run my file, though, I get this
traceback:

C:\Users\Alex>c:\python26\python.exe i:\arm\dictionary.py
Traceback (most recent call last):
  File "i:\arm\dictionary.py", line 2, in <module>
    import wx
  File "c:\python26\lib\site-packages\wx-2.8-msw-unicode\wx\__init__.py", line 4
5, in <module>
    from wx._core import *
  File "c:\python26\lib\site-packages\wx-2.8-msw-unicode\wx\_core.py", line 4, i
n <module>
    import _core_
ImportError: DLL load failed: The specified procedure could not be found.

I am running win7x64, wxPython2.8, python2.6. Any ideas why this would
be happening? I found a forum post that talked about a manifest file
and some dll files being needed, but it did not make a lot of sense.
Thanks!


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From gagsl-py2 at yahoo.com.ar  Thu Mar 11 13:28:15 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 11 Mar 2010 15:28:15 -0300
Subject: Python Script to get Info from Site not working
References: <993c3089-0f96-4f37-b42a-111731045b2d@k24g2000pro.googlegroups.com>
	<mailman.592.1268273109.23598.python-list@python.org>
	<396ffb5b-8548-4e4d-8245-a53ecb3cff23@k24g2000pro.googlegroups.com>
Message-ID: <op.u9e1ldhkx6zn5v@lepton.softlabbsas.com.ar>

En Wed, 10 Mar 2010 23:26:05 -0300, Jimbo <nilly16 at yahoo.com> escribi?:

> On Mar 11, 12:38 pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:
>> En Wed, 10 Mar 2010 20:06:41 -0300, Jimbo <nill... at yahoo.com> escribi?:
>>
>> > I found a semi Python & internet tutorial here if anyone else would
>> > like ithttp://www.upriss.org.uk/python/session6.html
>>
>> Replace the last line with something like this, to see what you are  
>> getting exactly:
>>
>>         print("Sorry, no %r (%r) available." % (
>>            drink,
>>            cgi.escape(repr(type(drink)))))
>>
>> BTW, which Python version are you using? The tutorial you linked to is  
>> aimed at Python 2.x, but your print syntax suggests you're using Python  
>> 3.x

> I am using 3.x, do you think I should be using something else?

Yes, you should use the same version as the tutorial you're following.
Learning how to program, CGI, HTML and Python at the same time is hard
enough to complicate it with incompatible version differences. I suggest
Python 2.6.4

> Also
> the your code I put in does the some thing, just now it says "Sorry no
> none drink available" all the time.

As a general rule, always directly copy and paste the error messages you
get and the source code you execute. Do not retype or paraphrase them.
That's important for the rest of us to be able to help you - now and in
the future.

In this case, the message should read "Sorry, no None (<type 'NoneType'>)
available." (None, not none, is a built-in special object in Python). So
we know that drink is None instead of one of the expected values, and we
could start investigating why. But there is no point in digging further -
instead, downgrade to Python 2.6.4 and try again.
This might be a server issue, unrelated to your script. BTW, you didn't
mention the server software.

-- 
Gabriel Genellina



From ludolph at openhazel.co.za  Thu Mar 11 13:38:56 2010
From: ludolph at openhazel.co.za (Ludolph)
Date: Thu, 11 Mar 2010 20:38:56 +0200
Subject: Visual Python programming and decompilers?
Message-ID: <95cccfc91003111038y6f07efb2m623122a3b8a60127@mail.gmail.com>

Hi Guys

At work I have been exposed to a Agile Platform called OutSystems. It
allows you to visually program your web applications
http://i.imgur.com/r2F0i.png and I find the idea very intriguing.

So I have started to play around with the idea on how will I be able
to visually represent Python code as in the above image and then allow
the programmer to change some of the flow/code/logic visually and then
get it back as python source code. I don't know if this have been
tried before and after some googling I can't find anything like this,
so maybe I'm just lacking basic googling skills or a python solution
like the above does not exist yet.

If anybody knows of such solution please let me know, so that I don't
spend a lot of time recreating the wheel. Otherwise help me out on the
following problem:

I decided I can use byteplay3 http://pypi.python.org/pypi/byteplay/ to
disassemble the code to workable objects, It even allows me to rebuild
the objects to bytecode. So if I define patterns on how python
interrupts the source code to bytecode I can visually represent this
and also so convert my visual representations back to bytecode.

The only problem I have at the moment is how will I get this bytecode
back to python source code. I have googled for python decompiler but
only found old projects like unpyc, decompyle and some online
services. I would like to know if anybody know of a well maintained or
at least recent module that can help me accomplish the above
mentioned, because I'm hoping I can implement this in Python 3.1.

So any input or suggestion would be greatly appreciated.

Kind Regards,

-- 
Ludolph Neethling


From gagsl-py2 at yahoo.com.ar  Thu Mar 11 13:45:03 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 11 Mar 2010 15:45:03 -0300
Subject: Get a method instance through 'getattr' but not superclass's
	method
References: <e28756ee1003102047i2f60dbbev708e1cfa7a240f7f@mail.gmail.com>
Message-ID: <op.u9e2dd2fx6zn5v@lepton.softlabbsas.com.ar>

En Thu, 11 Mar 2010 01:47:30 -0300, Radhakrishna Bhat
<radhakrishna12 at gmail.com> escribi?:

> I am using getattr to get a method instance from a class. But it also
> returns methods from the superclass. How to detect if an attribute is  
> from
> superclass?

You may look it up directly in the class dictionary (__dict__)

-- 
Gabriel Genellina



From kevin.p.dwyer at gmail.com  Thu Mar 11 13:54:41 2010
From: kevin.p.dwyer at gmail.com (Kev Dwyer)
Date: Thu, 11 Mar 2010 18:54:41 +0000 (UTC)
Subject: Python 2.6 and modules dbi AND odbc
References: <2fb4a5011003101617r5518b322y6ccc091046b0ccc4@mail.gmail.com>
Message-ID: <hnbe9h$58d$1@dough.gmane.org>

On Wed, 10 Mar 2010 16:17:29 -0800, robert somerville wrote:

> hi;
>  i am trying to get some legacy python code (which i no nothing about)
> working with tries to import dbi and odbc (the import fails ...) it
> looks like these modules are deprecated ?? if so is there a work around
> , if not deprecated, what am i doing wrong ?? i see no Ubuntu packages
> that look promising ..
 
Hello Robert,

These modules are distributed as part of the PyWin32 Python for Windows
 extensions, so they need to run on a Windows box.  They'll run fine 
there regardless of the deprecation of dbi (though "import dbi" will 
provide a useful warning message).

Pyodbc is a possible alternative.

Cheers,

Kev



From CalWhoNOSPAM at roadrunner.com  Thu Mar 11 13:56:08 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Thu, 11 Mar 2010 13:56:08 -0500
Subject: I get the error:    ImportError: No module named ffnet
References: <hnb339$g2g$1@news.eternal-september.org>
Message-ID: <hnbeca$6k1$1@news.eternal-september.org>

I found out I had something installed wrong.

" Cal Who" <CalWhoNOSPAM at roadrunner.com> wrote in message 
news:hnb339$g2g$1 at news.eternal-september.org...
>
>
> I have the .py file in Eclipse
> #@PydevCodeAnalysisIgnore
> from ffnet import ffnet, mlgraph
> topology = mlgraph( (2, 3, 1) )
> nn = ffnet(topology)
>
> I select RunAs / Python Run
>
> I get the error
> from ffnet import ffnet, mlgraph
> ImportError: No module named ffnet
>
> In the folder Python26\lib\site-packages I see
> ffnet-0.6.2-py2.6.egg-info
>
> also a folder ffnet
> in that folder there is a folder Examples
> If I click one of the examples pyrhon.exe opens and runs it OK.
>
> Is there enough in the above for you to tell me how to procede?
>
> Thanks in advance for any help at all
>
>
> 




From jcb at iteris.com  Thu Mar 11 14:01:39 2010
From: jcb at iteris.com (Metalone)
Date: Thu, 11 Mar 2010 11:01:39 -0800 (PST)
Subject: file seek is slow
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>
	<daf5c75e-8139-4a4a-8c27-5cef00327bb1@o3g2000yqb.googlegroups.com> 
	<d86f1068-8cd4-4489-af00-450d407baf41@g28g2000prb.googlegroups.com> 
	<RwVln.12295$pv.5770@news-server.bigpond.net.au>
	<e8a9a95f-77b3-43ce-8110-8c6babaa6f26@z4g2000yqa.googlegroups.com>
Message-ID: <781d69b1-c5e1-4013-9015-4983dbfaa4d7@k6g2000prg.googlegroups.com>

I am assuming that Python delegates the f.seek call to the seek call
in the MS C runtime library msvcrt.dll.
Does anybody know a nice link to the Python source like was posted
above for the BSD 'C' library?

Ok, I ran some more tests.
C, seek            : 0.812 seconds   // test from original post
Python, f.seek     : 1.458 seconds.  // test from original post

C, time(&tm)       : 0.671 seconds
Python, time.time(): 0.513 seconds.
Python, ctypes.msvcrt.time(ctypes.byref(tm)): 0.971 seconds.   #
factored the overhead to be outside the loop, so really this was
func_ptr(ptr).

Perhaps I am just comparing apples to oranges.
I never tested the overhead of ctypes like this before.
Most of my problem timings involve calls through ctypes.


From CalWhoNOSPAM at roadrunner.com  Thu Mar 11 14:01:39 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Thu, 11 Mar 2010 14:01:39 -0500
Subject: Where can I find documentation for data[:,9]
Message-ID: <hnbemp$7p0$1@news.eternal-september.org>

data = readdata( 'data/input.dat', delimiter = ',' )

input = data[:, :9]#nine data columns



Where can I find documentation for the

data[:,9]

in the code above.

Been looking and found many examples but would like to know the definition.

I need to skip the first column and then read 9



I would also like to print the data in ihe variable "input"



Thanks




From robert.kern at gmail.com  Thu Mar 11 14:22:21 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Thu, 11 Mar 2010 13:22:21 -0600
Subject: Where can I find documentation for data[:,9]
In-Reply-To: <hnbemp$7p0$1@news.eternal-september.org>
References: <hnbemp$7p0$1@news.eternal-september.org>
Message-ID: <hnbfte$iac$1@dough.gmane.org>

On 2010-03-11 13:01 PM,  Cal Who wrote:
> data = readdata( 'data/input.dat', delimiter = ',' )
>
> input = data[:, :9]#nine data columns
>
>
>
> Where can I find documentation for the
>
> data[:,9]
>
> in the code above.
>
> Been looking and found many examples but would like to know the definition.

When asking questions like this, it helps *a lot* to provide a complete example, 
not just a snippet. If I weren't already intimately familiar with the library 
you are using, I would have no idea how to help you.

However, I do know that input object is a numpy array, and the syntax you are 
asking about is multidimensional slicing.

http://docs.scipy.org/doc/numpy/reference/arrays.indexing.html

> I need to skip the first column and then read 9

data[:, 1:10]

> I would also like to print the data in ihe variable "input"

print input

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From misceverything at gmail.com  Thu Mar 11 14:29:53 2010
From: misceverything at gmail.com (T)
Date: Thu, 11 Mar 2010 11:29:53 -0800 (PST)
Subject: Parsing Email Headers
Message-ID: <e574cbf6-d7e8-49e8-be87-93c9a59e3d87@z35g2000yqd.googlegroups.com>

All I'm looking to do is to download messages from a POP account and
retrieve the sender and subject from their headers.  Right now I'm 95%
of the way there, except I can't seem to figure out how to *just* get
the headers.  Problem is, certain email clients also include headers
in the message body (i.e. if you're replying to a message), and these
are all picked up as additional senders/subjects.  So, I want to avoid
processing anything from the message body.

Here's a sample of what I have:

                # For each line in message
                for j in M.retr(i+1)[1]:
                    # Create email message object from returned string
                    emailMessage = email.message_from_string(j)
                    # Get fields
                    fields = emailMessage.keys()
                    # If email contains "From" field
                    if emailMessage.has_key("From"):
                        # Get contents of From field
                        from_field = emailMessage.__getitem__("From")

I also tried using the following, but got the same results:
                 emailMessage =
email.Parser.HeaderParser().parsestr(j, headersonly=True)

Any help would be appreciated!


From mehgcap at gmail.com  Thu Mar 11 14:56:12 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Thu, 11 Mar 2010 14:56:12 -0500
Subject: importing modules from subdirs
In-Reply-To: <hnbbov$v4q$1@dough.gmane.org>
References: <bc7f680c1003110951p7d1253d9nb8b67e47f41d3970@mail.gmail.com>
	<hnbbov$v4q$1@dough.gmane.org>
Message-ID: <bc7f680c1003111156s3495596ak46c87efe27246378@mail.gmail.com>

Halfway there. It imports now, but it says that the module does not
have functions which I know it does have. I will just leave it all in
one folder for now and play with organization after I get the project
working better.

On 3/11/10, Steve Holden <steve at holdenweb.com> wrote:
> Alex Hall wrote:
>> Hi all,
>> The manual says, for modules in a project stored in subdirectories, you
>> can do:
>> import folderName.module
>>
>> I have a couple questions, though:
>> 1. Do I then have to call functions from module like
>> folder.module.function, or can I still use the normal module.function?
>>
>> 2. When I try to do this, it fails. I have an sw folder. Inside that I
>> have a modes folder, holding weather.pyw. Main.pyw, back in the sw
>> folder, is trying to import modes.weather, but nothing happens. I have
>> tried putting weather.pyw in its own weather folder under the modes
>> folder, but that also fails. I have placed an empty __init__.py file
>> in both the modes folder and the weather subfolder, but I cannot get
>> main.pyw to import weather!
>>
>> 3. How does weather import from a folder above or beside it? For
>> example, if a config directory is at the same level as the modes
>> directory, how can weather import something from config?
>>
>> Thanks!
>>
> I haven't checked this, but I believe .pyw names are only for main
> programs. Try renaming weather.pyw as weather.py and see if it makes any
> difference.
>
> regards
>  Steve
> --
> Steve Holden           +1 571 484 6266   +1 800 494 3119
> See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
> Holden Web LLC                 http://www.holdenweb.com/
> UPCOMING EVENTS:        http://holdenweb.eventbrite.com/
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From python at mrabarnett.plus.com  Thu Mar 11 15:13:48 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 11 Mar 2010 20:13:48 +0000
Subject: Parsing Email Headers
In-Reply-To: <e574cbf6-d7e8-49e8-be87-93c9a59e3d87@z35g2000yqd.googlegroups.com>
References: <e574cbf6-d7e8-49e8-be87-93c9a59e3d87@z35g2000yqd.googlegroups.com>
Message-ID: <4B994EFC.4060400@mrabarnett.plus.com>

T wrote:
> All I'm looking to do is to download messages from a POP account and
> retrieve the sender and subject from their headers.  Right now I'm 95%
> of the way there, except I can't seem to figure out how to *just* get
> the headers.  Problem is, certain email clients also include headers
> in the message body (i.e. if you're replying to a message), and these
> are all picked up as additional senders/subjects.  So, I want to avoid
> processing anything from the message body.
> 
> Here's a sample of what I have:
> 
>                 # For each line in message
>                 for j in M.retr(i+1)[1]:
>                     # Create email message object from returned string
>                     emailMessage = email.message_from_string(j)
>                     # Get fields
>                     fields = emailMessage.keys()
>                     # If email contains "From" field
>                     if emailMessage.has_key("From"):
>                         # Get contents of From field
>                         from_field = emailMessage.__getitem__("From")
> 
> I also tried using the following, but got the same results:
>                  emailMessage =
> email.Parser.HeaderParser().parsestr(j, headersonly=True)
> 
> Any help would be appreciated!

If you're using poplib then use ".top" instead of ".retr".


From debatem1 at gmail.com  Thu Mar 11 15:16:26 2010
From: debatem1 at gmail.com (geremy condra)
Date: Thu, 11 Mar 2010 15:16:26 -0500
Subject: Visual Python programming and decompilers?
In-Reply-To: <95cccfc91003111038y6f07efb2m623122a3b8a60127@mail.gmail.com>
References: <95cccfc91003111038y6f07efb2m623122a3b8a60127@mail.gmail.com>
Message-ID: <f3cc57c61003111216g70a16aaqaae9d26ead064f0c@mail.gmail.com>

On Thu, Mar 11, 2010 at 1:38 PM, Ludolph <ludolph at openhazel.co.za> wrote:
> Hi Guys
>
> At work I have been exposed to a Agile Platform called OutSystems. It
> allows you to visually program your web applications
> http://i.imgur.com/r2F0i.png and I find the idea very intriguing.
>
> So I have started to play around with the idea on how will I be able
> to visually represent Python code as in the above image and then allow
> the programmer to change some of the flow/code/logic visually and then
> get it back as python source code. I don't know if this have been
> tried before and after some googling I can't find anything like this,
> so maybe I'm just lacking basic googling skills or a python solution
> like the above does not exist yet.
>
> If anybody knows of such solution please let me know, so that I don't
> spend a lot of time recreating the wheel. Otherwise help me out on the
> following problem:
>
> I decided I can use byteplay3 http://pypi.python.org/pypi/byteplay/ to
> disassemble the code to workable objects, It even allows me to rebuild
> the objects to bytecode. So if I define patterns on how python
> interrupts the source code to bytecode I can visually represent this
> and also so convert my visual representations back to bytecode.
>
> The only problem I have at the moment is how will I get this bytecode
> back to python source code. I have googled for python decompiler but
> only found old projects like unpyc, decompyle and some online
> services. I would like to know if anybody know of a well maintained or
> at least recent module that can help me accomplish the above
> mentioned, because I'm hoping I can implement this in Python 3.1.
>
> So any input or suggestion would be greatly appreciated.
>
> Kind Regards,
>
> --
> Ludolph Neethling
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Maybe something like http://www.pypes.org/?

They were at pycon and sounded pretty into what they were
talking about- I'd send them an email.

Geremy Condra


From stef.mientki at gmail.com  Thu Mar 11 15:17:09 2010
From: stef.mientki at gmail.com (Stef Mientki)
Date: Thu, 11 Mar 2010 21:17:09 +0100
Subject: Visual Python programming and decompilers?
In-Reply-To: <95cccfc91003111038y6f07efb2m623122a3b8a60127@mail.gmail.com>
References: <95cccfc91003111038y6f07efb2m623122a3b8a60127@mail.gmail.com>
Message-ID: <4B994FC5.1030106@gmail.com>

On 11-03-2010 19:38, Ludolph wrote:
> Hi Guys
>
> At work I have been exposed to a Agile Platform called OutSystems. It
> allows you to visually program your web applications
> http://i.imgur.com/r2F0i.png and I find the idea very intriguing.
>
>    
Although not as low level as you want,
http://mientki.ruhosting.nl/data_www/pylab_works/pw_animations_screenshots.html
http://code.google.com/p/pylab-works/
and here an overview of similar packages

cheers,
Stef


From invalid at invalid.invalid  Thu Mar 11 15:20:56 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Thu, 11 Mar 2010 20:20:56 +0000 (UTC)
Subject: Parsing Email Headers
References: <e574cbf6-d7e8-49e8-be87-93c9a59e3d87@z35g2000yqd.googlegroups.com>
Message-ID: <hnbjb8$6ce$3@reader1.panix.com>

On 2010-03-11, T <misceverything at gmail.com> wrote:
> All I'm looking to do is to download messages from a POP account and
> retrieve the sender and subject from their headers.  Right now I'm 95%
> of the way there, except I can't seem to figure out how to *just* get
> the headers.

The headers are saparated from the body by a blank line.

> Problem is, certain email clients also include headers in the message
> body (i.e. if you're replying to a message), and these are all picked
> up as additional senders/subjects.  So, I want to avoid processing
> anything from the message body.

Then stop when you see a blank line.

Or retreive just the headers.

-- 
Grant Edwards               grant.b.edwards        Yow! My life is a patio
                                  at               of fun!
                              gmail.com            


From astley.lejasper at gmail.com  Thu Mar 11 15:57:07 2010
From: astley.lejasper at gmail.com (Astley Le Jasper)
Date: Thu, 11 Mar 2010 12:57:07 -0800 (PST)
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>
	<mailman.619.1268324988.23598.python-list@python.org>
	<4B992FB5.8090207@v.loewis.de>
Message-ID: <72a0d93e-50f8-415b-aa74-5d7abe6d8523@z11g2000yqz.googlegroups.com>

@Robin
Thanks. I thought that this seemed to be a general python thing
because it was effecting both installs. However, after also reading
Martin's comments ...

@Martin
> This is somewhat imprecise: is it
> a) that your CPU is AMD64, and thus supports 64-bit mode, or
> b) that *in addition*, your Windows 7 installation is a 64-bit
> installation, or
> c) that *in addition*, your Python installation is also a 64-bit
>    installation.
>
> Unless you have a specific need for 64-bit mode, I recommend that you
> use the 32-bit version of Windows (unless you have more than 4GB of
> main memory), and (even if you have a 64-bit Windows) you install the
> 32-bit version of Python on it (unless you have the need to access more
> than 2GB of objects in your Python applications.


Sorry. I have Windows 7 (64-bit) installed on a machine with an AMD
cpu (which supports 64-bit mode), with a 64-bit version of
(Activestate) python 2.6 .... although I didn't realise the later
until I looked just now.

> Install the 32-bit version of Python, and these installers should work fine.
Well, I uninstalled the 64-bit version and the installers did indeed
work.

I?m sorry everyone. I didn?t realise I had installed the 64-bit
version of Python. Well, at least someone else might find have the
same problem. But I think that there is going to be a bit of a rough
patch as everyone moves over to 64-bit.

ALJ


From greg.ewing at canterbury.ac.nz  Thu Mar 11 16:40:33 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Fri, 12 Mar 2010 10:40:33 +1300
Subject: Reverse engineering CRC?
In-Reply-To: <3b1dce65-99ed-471a-8494-9eaf0e6d44ad@e19g2000prn.googlegroups.com>
References: <7vj7fdFnnjU1@mid.individual.net>
	<3b1dce65-99ed-471a-8494-9eaf0e6d44ad@e19g2000prn.googlegroups.com>
Message-ID: <7vt5n8FetlU1@mid.individual.net>

Steve Howell wrote:

> Hi Greg.  I would at least flip one bit at a time on the first byte of
> your data to see if the transformation is bitwise.

I'm actually making good progress on this -- it turns out
there *is* a way of deducing the polynomial by looking at
the effect of single-bit flips. It's actually quite simple,
with no brute-force searching needed at all.

Things get a bit tricky when you don't quite know all
of the data that goes into the CRC, though, which seems
to be the case here...

I'm writing up an essay on my experiences. I'll post a
link when it's finished.

-- 
Greg


From CalWhoNOSPAM at roadrunner.com  Thu Mar 11 17:08:36 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Thu, 11 Mar 2010 17:08:36 -0500
Subject: Where can I find documentation for data[:,9]
References: <hnbemp$7p0$1@news.eternal-september.org>
	<mailman.631.1268335358.23598.python-list@python.org>
Message-ID: <hnbpl7$iqr$1@news.eternal-september.org>


"Robert Kern" <robert.kern at gmail.com> wrote in message 
news:mailman.631.1268335358.23598.python-list at python.org...
> On 2010-03-11 13:01 PM,  Cal Who wrote:
>> data = readdata( 'data/input.dat', delimiter = ',' )
>>
>> input = data[:, :9]#nine data columns
>>
>>
>>
>> Where can I find documentation for the
>>
>> data[:,9]
>>
>> in the code above.
>>
>> Been looking and found many examples but would like to know the 
>> definition.
>
> When asking questions like this, it helps *a lot* to provide a complete 
> example, not just a snippet. If I weren't already intimately familiar with 
> the library you are using, I would have no idea how to help you.
>
> However, I do know that input object is a numpy array, and the syntax you 
> are asking about is multidimensional slicing.
>
> http://docs.scipy.org/doc/numpy/reference/arrays.indexing.html
>
>> I need to skip the first column and then read 9
>
> data[:, 1:10]
>
>> I would also like to print the data in ihe variable "input"
>
> print input
>
> -- 
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless 
> enigma
>  that is made terrible by our own mad attempt to interpret it as though it 
> had
>  an underlying truth."
>   -- Umberto Eco
>
Thanks, that helped a lot.

I'm having trouble knowing what to search for to find documenatation. For 
example, is print a Python command, a numpy command or a java command?

I like to read the documentation even if the command is working for me.


Thanks again 




From martin.hellwig at dcuktec.org  Thu Mar 11 17:19:09 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Thu, 11 Mar 2010 22:19:09 +0000
Subject: Where can I find documentation for data[:,9]
In-Reply-To: <hnbpl7$iqr$1@news.eternal-september.org>
References: <hnbemp$7p0$1@news.eternal-september.org>
	<mailman.631.1268335358.23598.python-list@python.org>
	<hnbpl7$iqr$1@news.eternal-september.org>
Message-ID: <hnbq8q$vgm$1@news.eternal-september.org>

On 03/11/10 22:08,  Cal Who wrote:
<cut>
> Thanks, that helped a lot.
>
> I'm having trouble knowing what to search for to find documenatation. For
> example, is print a Python command, a numpy command or a java command?
>
> I like to read the documentation even if the command is working for me.
>
>
> Thanks again
>
>
Probably for you the right way would be to familiarize yourself with the 
namespace concept of Python, this makes it easier to identify whether 
something is built-in, a standard module or an external module.
Which makes it much easier to feed google the right clues.

-- 
mph


From misceverything at gmail.com  Thu Mar 11 17:44:09 2010
From: misceverything at gmail.com (T)
Date: Thu, 11 Mar 2010 14:44:09 -0800 (PST)
Subject: Parsing Email Headers
References: <e574cbf6-d7e8-49e8-be87-93c9a59e3d87@z35g2000yqd.googlegroups.com>
	<mailman.633.1268338431.23598.python-list@python.org>
Message-ID: <91153e11-2980-4218-bc88-c92bda7d517e@z11g2000yqz.googlegroups.com>

On Mar 11, 3:13?pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
> T wrote:
> > All I'm looking to do is to download messages from a POP account and
> > retrieve the sender and subject from their headers. ?Right now I'm 95%
> > of the way there, except I can't seem to figure out how to *just* get
> > the headers. ?Problem is, certain email clients also include headers
> > in the message body (i.e. if you're replying to a message), and these
> > are all picked up as additional senders/subjects. ?So, I want to avoid
> > processing anything from the message body.
>
> > Here's a sample of what I have:
>
> > ? ? ? ? ? ? ? ? # For each line in message
> > ? ? ? ? ? ? ? ? for j in M.retr(i+1)[1]:
> > ? ? ? ? ? ? ? ? ? ? # Create email message object from returned string
> > ? ? ? ? ? ? ? ? ? ? emailMessage = email.message_from_string(j)
> > ? ? ? ? ? ? ? ? ? ? # Get fields
> > ? ? ? ? ? ? ? ? ? ? fields = emailMessage.keys()
> > ? ? ? ? ? ? ? ? ? ? # If email contains "From" field
> > ? ? ? ? ? ? ? ? ? ? if emailMessage.has_key("From"):
> > ? ? ? ? ? ? ? ? ? ? ? ? # Get contents of From field
> > ? ? ? ? ? ? ? ? ? ? ? ? from_field = emailMessage.__getitem__("From")
>
> > I also tried using the following, but got the same results:
> > ? ? ? ? ? ? ? ? ?emailMessage =
> > email.Parser.HeaderParser().parsestr(j, headersonly=True)
>
> > Any help would be appreciated!
>
> If you're using poplib then use ".top" instead of ".retr".

I'm still having the same issue, even with .top.  Am I missing
something?

                for j in M.top(i+1, 0)[1]:
                    emailMessage = email.message_from_string(j)
                    #emailMessage =
email.Parser.HeaderParser().parsestr(j, headersonly=True)
                    # Get fields
                    fields = emailMessage.keys()
                    # If email contains "From" field
                    if emailMessage.has_key("From"):
                        # Get contents of From field
                        from_field = emailMessage.__getitem__("From")

Is there another way I should be using to retrieve only the headers
(not those in the body)?


From martin.hellwig at dcuktec.org  Thu Mar 11 17:46:57 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Thu, 11 Mar 2010 22:46:57 +0000
Subject: Platform Requirement Checker (was Does this already exists?: A module
	that checks if the used platform is supported)
In-Reply-To: <mailman.588.1268271605.23598.python-list@python.org>
References: <hn88ag$b5m$1@news.eternal-september.org>
	<mailman.588.1268271605.23598.python-list@python.org>
Message-ID: <hnbrsu$b8g$1@news.eternal-september.org>

On 03/11/10 01:37, Gabriel Genellina wrote:
> En Wed, 10 Mar 2010 10:54:27 -0300, Martin P. Hellwig
> <martin.hellwig at dcuktec.org> escribi?:
>
>> Before I start reinventing a squared wheel, I have the following
>> question:
>> Is there already a (standard) module that wraps around the various
>> os/sys information which checks if the platform + version is supported
>> for what I want to do with it.
>
> In case you were not aware of it: see the platform module. But you'll have
> to do the checks yourself (based on the info it returns).
>
Thanks for the reminder, it indeed slipped my mind.

As Python features are luckily mostly platform independent, I am not 
sure if a convenient 'platform requirement check' module would be worth 
the energy creating it, any thoughts on that?

For clarity purpose I re'added (and adapted) in what lines I was thinking:
-
test = RequirePlatform(do_not_raise=True)
# If do_not_raise is not set or False, an error will be raised
# after a failed require line, otherwise just continue.

test.require(key='test1', platform='freebsd', version_min='2.2')
# If the platform is anything else but FreeBSD 2.2 onwards return False
# and store the result of the test.
# Result of the require (and any additional tests
# can be accessed using the index operators;

if test['test1']:
     print('supported')
-
Other requirements like architecture, python vm type/version, cpu 
features, etc. Might also be nice to have.


-- 
mph


From CalWhoNOSPAM at roadrunner.com  Thu Mar 11 17:52:21 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Thu, 11 Mar 2010 17:52:21 -0500
Subject: Where can I find documentation for data[:,9]
References: <hnbemp$7p0$1@news.eternal-september.org>
	<mailman.631.1268335358.23598.python-list@python.org>
	<hnbpl7$iqr$1@news.eternal-september.org>
	<hnbq8q$vgm$1@news.eternal-september.org>
Message-ID: <hnbs79$sds$1@news.eternal-september.org>


"Martin P. Hellwig" <martin.hellwig at dcuktec.org> wrote in message 
news:hnbq8q$vgm$1 at news.eternal-september.org...
> On 03/11/10 22:08,  Cal Who wrote:
> <cut>
>> Thanks, that helped a lot.
>>
>> I'm having trouble knowing what to search for to find documenatation. For
>> example, is print a Python command, a numpy command or a java command?
>>
>> I like to read the documentation even if the command is working for me.
>>
>>
>> Thanks again
>>
>>
> Probably for you the right way would be to familiarize yourself with the 
> namespace concept of Python, this makes it easier to identify whether 
> something is built-in, a standard module or an external module.
> Which makes it much easier to feed google the right clues.
>
> -- 
> mph

Thanks a lot, I'll look that up now. 




From jcb at iteris.com  Thu Mar 11 17:57:28 2010
From: jcb at iteris.com (Metalone)
Date: Thu, 11 Mar 2010 14:57:28 -0800 (PST)
Subject: file seek is slow
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>
	<daf5c75e-8139-4a4a-8c27-5cef00327bb1@o3g2000yqb.googlegroups.com> 
	<d86f1068-8cd4-4489-af00-450d407baf41@g28g2000prb.googlegroups.com> 
	<RwVln.12295$pv.5770@news-server.bigpond.net.au>
	<e8a9a95f-77b3-43ce-8110-8c6babaa6f26@z4g2000yqa.googlegroups.com>
	<781d69b1-c5e1-4013-9015-4983dbfaa4d7@k6g2000prg.googlegroups.com>
Message-ID: <5fab36b5-8f04-4e17-98c0-67aab24bb239@u19g2000prh.googlegroups.com>

I just tried the seek test with Cython.
Cython fseek() : 1.059 seconds.  30% slower than 'C'
Python f.seek  : 1.458 secondds. 80% slower than 'C'.

It is amazing to me that Cython generates a 'C' file that is 1478
lines.


#Cython code

import time

cdef int SEEK_SET = 0

cdef extern from "stdio.h":
    void* fopen(char* filename, char* mode)
    int fseek(void*, long, int)

def main():
    cdef void* f1 = fopen('video.txt', 'rb')
    cdef int i=1000000
    t0 = time.clock()
    while i > 0:
       fseek(f1, 0, SEEK_SET)
       i -= 1
    delta = time.clock() - t0
    print "%.3f" % delta

if __name__ == '__main__':
    main()


From felix.antoine.fortin at gmail.com  Thu Mar 11 18:05:00 2010
From: felix.antoine.fortin at gmail.com (=?ISO-8859-1?Q?F=E9lix=2DAntoine_Fortin?=)
Date: Thu, 11 Mar 2010 15:05:00 -0800 (PST)
Subject: inspect.stack() and frame
Message-ID: <6f3a93d6-5608-467f-a7db-d360a34fe856@i25g2000yqm.googlegroups.com>

Given this code :
# Experience with frame
import sys
import inspect

def foo():
    stack = inspect.stack()
    print "foo frame : " + str(hex(id(sys._getframe())))

def foo2():
    inspect.stack()
    print "foo2 frame : " + str(hex(id(sys._getframe())))

def bar():
    print "bar frame : " + str(hex(id(sys._getframe())))

foo()
foo()

foo2()
foo2()

bar()
bar()

Output example :
foo frame : 0x84d2c0
foo frame : 0x844bf0
foo2 frame : 0x898c90
foo2 frame : 0x898c90
bar frame : 0x898f70
bar frame : 0x898f70

Why are the ids (address) of the frame for each foo call not the same?
Or why the call to "stack = inspect.stack()" change the address of the
frame?


From python at mrabarnett.plus.com  Thu Mar 11 18:06:40 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 11 Mar 2010 23:06:40 +0000
Subject: Parsing Email Headers
In-Reply-To: <91153e11-2980-4218-bc88-c92bda7d517e@z11g2000yqz.googlegroups.com>
References: <e574cbf6-d7e8-49e8-be87-93c9a59e3d87@z35g2000yqd.googlegroups.com>	<mailman.633.1268338431.23598.python-list@python.org>
	<91153e11-2980-4218-bc88-c92bda7d517e@z11g2000yqz.googlegroups.com>
Message-ID: <4B997780.4000009@mrabarnett.plus.com>

T wrote:
> On Mar 11, 3:13 pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
>> T wrote:
>>> All I'm looking to do is to download messages from a POP account and
>>> retrieve the sender and subject from their headers.  Right now I'm 95%
>>> of the way there, except I can't seem to figure out how to *just* get
>>> the headers.  Problem is, certain email clients also include headers
>>> in the message body (i.e. if you're replying to a message), and these
>>> are all picked up as additional senders/subjects.  So, I want to avoid
>>> processing anything from the message body.
>>> Here's a sample of what I have:
>>>                 # For each line in message
>>>                 for j in M.retr(i+1)[1]:
>>>                     # Create email message object from returned string
>>>                     emailMessage = email.message_from_string(j)
>>>                     # Get fields
>>>                     fields = emailMessage.keys()
>>>                     # If email contains "From" field
>>>                     if emailMessage.has_key("From"):
>>>                         # Get contents of From field
>>>                         from_field = emailMessage.__getitem__("From")
>>> I also tried using the following, but got the same results:
>>>                  emailMessage =
>>> email.Parser.HeaderParser().parsestr(j, headersonly=True)
>>> Any help would be appreciated!
>> If you're using poplib then use ".top" instead of ".retr".
> 
> I'm still having the same issue, even with .top.  Am I missing
> something?
> 
>                 for j in M.top(i+1, 0)[1]:
>                     emailMessage = email.message_from_string(j)
>                     #emailMessage =
> email.Parser.HeaderParser().parsestr(j, headersonly=True)
>                     # Get fields
>                     fields = emailMessage.keys()
>                     # If email contains "From" field
>                     if emailMessage.has_key("From"):
>                         # Get contents of From field
>                         from_field = emailMessage.__getitem__("From")
> 
> Is there another way I should be using to retrieve only the headers
> (not those in the body)?

The documentation does say:

   """unfortunately, TOP is poorly specified in the RFCs and is
frequently broken in off-brand servers."""

All I can say is that it works for me with my ISP! :-)


From python at mrabarnett.plus.com  Thu Mar 11 18:09:05 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 11 Mar 2010 23:09:05 +0000
Subject: Platform Requirement Checker (was Does this already exists?:
	A module	that checks if the used platform is supported)
In-Reply-To: <hnbrsu$b8g$1@news.eternal-september.org>
References: <hn88ag$b5m$1@news.eternal-september.org>	<mailman.588.1268271605.23598.python-list@python.org>
	<hnbrsu$b8g$1@news.eternal-september.org>
Message-ID: <4B997811.3000607@mrabarnett.plus.com>

Martin P. Hellwig wrote:
> On 03/11/10 01:37, Gabriel Genellina wrote:
>> En Wed, 10 Mar 2010 10:54:27 -0300, Martin P. Hellwig
>> <martin.hellwig at dcuktec.org> escribi?:
>>
>>> Before I start reinventing a squared wheel, I have the following
>>> question:
>>> Is there already a (standard) module that wraps around the various
>>> os/sys information which checks if the platform + version is supported
>>> for what I want to do with it.
>>
>> In case you were not aware of it: see the platform module. But you'll 
>> have
>> to do the checks yourself (based on the info it returns).
>>
> Thanks for the reminder, it indeed slipped my mind.
> 
> As Python features are luckily mostly platform independent, I am not 
> sure if a convenient 'platform requirement check' module would be worth 
> the energy creating it, any thoughts on that?
> 
> For clarity purpose I re'added (and adapted) in what lines I was thinking:
> -
> test = RequirePlatform(do_not_raise=True)
> # If do_not_raise is not set or False, an error will be raised
> # after a failed require line, otherwise just continue.
> 
> test.require(key='test1', platform='freebsd', version_min='2.2')
> # If the platform is anything else but FreeBSD 2.2 onwards return False
> # and store the result of the test.
> # Result of the require (and any additional tests
> # can be accessed using the index operators;
> 
> if test['test1']:
>     print('supported')
> -
> Other requirements like architecture, python vm type/version, cpu 
> features, etc. Might also be nice to have.
> 
It might be useful for up-front checking in those platform-specific
scripts, although the platform module might already be fulfilling that
need.


From gundlach at gmail.com  Thu Mar 11 18:16:36 2010
From: gundlach at gmail.com (gundlach)
Date: Thu, 11 Mar 2010 15:16:36 -0800 (PST)
Subject: pivot() equivalent
Message-ID: <e4febcbf-4efd-4a30-948d-43bdbd207e0b@g4g2000yqa.googlegroups.com>

I *know* this already exists, but I can't remember where:

def pivot(func, seq):
  # I know, a good implementation shouldn't call func() twice per item
  return ( (x for x in seq if func(x)), (x for x in seq if not
func(x)) )

I feel like I read a thread in which this was argued to death, and I
can't find that either.

The scenario: I have a sequence of lines from a file.  I want to split
it into those lines that contain a substring, and those that don't.  I
want it to be more efficient and prettier than

with = [x for x in lines if substring in x]
without = [x for x in lines if substring not in x]

Does this exist?

TIA,
Michael


From misceverything at gmail.com  Thu Mar 11 18:19:36 2010
From: misceverything at gmail.com (T)
Date: Thu, 11 Mar 2010 15:19:36 -0800 (PST)
Subject: Parsing Email Headers
References: <e574cbf6-d7e8-49e8-be87-93c9a59e3d87@z35g2000yqd.googlegroups.com>
	<mailman.633.1268338431.23598.python-list@python.org>
	<91153e11-2980-4218-bc88-c92bda7d517e@z11g2000yqz.googlegroups.com>
	<mailman.636.1268348804.23598.python-list@python.org>
Message-ID: <6e0f6857-bedd-4b23-81af-69dd06a53764@q15g2000yqj.googlegroups.com>

Thanks for your suggestions!  Here's what seems to be working - it's
basically the same thing I originally had, but first checks to see if
the line is blank

                response, lines, bytes = M.retr(i+1)
                # For each line in message
                for line in lines:
                    if not line.strip():
                        M.dele(i+1)
                        break

                    emailMessage = email.message_from_string(line)
                    # Get fields
                    fields = emailMessage.keys()
                    # If email contains "From" field
                    if emailMessage.has_key("From"):
                        # Get contents of From field
                        from_field = emailMessage.__getitem__("From")


From alfps at start.no  Thu Mar 11 18:22:02 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Fri, 12 Mar 2010 00:22:02 +0100
Subject: inspect.stack() and frame
In-Reply-To: <6f3a93d6-5608-467f-a7db-d360a34fe856@i25g2000yqm.googlegroups.com>
References: <6f3a93d6-5608-467f-a7db-d360a34fe856@i25g2000yqm.googlegroups.com>
Message-ID: <hnbtus$p5s$1@news.eternal-september.org>

* F?lix-Antoine Fortin:
> Given this code :
> # Experience with frame
> import sys
> import inspect
> 
> def foo():
>     stack = inspect.stack()
>     print "foo frame : " + str(hex(id(sys._getframe())))

hex returns a string. applying str is therefore redundant.


> def foo2():
>     inspect.stack()
>     print "foo2 frame : " + str(hex(id(sys._getframe())))
> 
> def bar():
>     print "bar frame : " + str(hex(id(sys._getframe())))
> 
> foo()
> foo()
> 
> foo2()
> foo2()
> 
> bar()
> bar()
> 
> Output example :
> foo frame : 0x84d2c0
> foo frame : 0x844bf0
> foo2 frame : 0x898c90
> foo2 frame : 0x898c90
> bar frame : 0x898f70
> bar frame : 0x898f70
> 
> Why are the ids (address) of the frame for each foo call not the same?

You're dealing with Python objects. You're not dealing with the computer's 
machine stack. Whether you get the same id for two objects whose lifetimes don't 
overlap depends on the implementation's memory and id allocation strategy.


> Or why the call to "stack = inspect.stack()" change the address of the
> frame?

Does it?


Cheers,

- Alf


From python at rgbaz.eu  Thu Mar 11 18:29:12 2010
From: python at rgbaz.eu (PythonAB)
Date: Fri, 12 Mar 2010 00:29:12 +0100
Subject: Bluetooth
In-Reply-To: <4B97B7F8.2030303@fedex.com>
References: <BD5B58B2-7774-4F42-90BC-5D0AF8CC82F7@rgbaz.eu>
	<4B97B7F8.2030303@fedex.com>
Message-ID: <1ED82F61-E3E8-4A3A-8028-0F8D4B82E580@rgbaz.eu>


On 10 mrt 2010, at 16:17, Jeff Peck wrote:

> On 3/7/2010 1:26 PM, PythonAB wrote:
>> 
>> Hello,
>> 
>> 
>> I'm writing a script that has to connect a bluetooth device
>> with a 3D application.
>> On my search for a bluetooth module i ran into this:
>> http://www.python.org/download/releases/2.4/notes/
>> where it says:
>> "The socket module now supports Bluetooth sockets,
>> if the system has <bluetooth/bluetooth.h>"
>> 
>> Yet I can't find anything at all in the socket manuals
>> nor anywhere else on the site...
>> 
>> Does the socket module really support Bluetooth out of the box?
>> I've used socket before but never read anything about bluetooth...
>> 
>> Maybe I need to get the bluetooth.h file, but i have no idea what I
>> am supposed to do with it...
>> 
>> Can anyone shed some light on this for me please?
>> 
>> thanks in advance,
>> 
>> gr
>> Arno
> 
> Have you come across the PyBluez library yet? I recently used it in a project and it worked very well.
> 
> Hth,
> Jeff

Hi Jeff,

Yes I ran into it, but couldn't find an OSX version...
I'm using the lightblue module now but would have preferred
to use the socket module without compiling python myself.

Sorry for not mentioning the platform.

gr
Arno
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From jjposner at optimum.net  Thu Mar 11 18:39:12 2010
From: jjposner at optimum.net (John Posner)
Date: Thu, 11 Mar 2010 18:39:12 -0500
Subject: pivot() equivalent
In-Reply-To: <e4febcbf-4efd-4a30-948d-43bdbd207e0b@g4g2000yqa.googlegroups.com>
References: <e4febcbf-4efd-4a30-948d-43bdbd207e0b@g4g2000yqa.googlegroups.com>
Message-ID: <4b997f06$0$5013$607ed4bc@cv.net>

On 3/11/2010 6:16 PM, gundlach wrote:
> I *know* this already exists, but I can't remember where:
>
> def pivot(func, seq):
>    # I know, a good implementation shouldn't call func() twice per item
>    return ( (x for x in seq if func(x)), (x for x in seq if not
> func(x)) )
>
> I feel like I read a thread in which this was argued to death, and I
> can't find that either.
>
> The scenario: I have a sequence of lines from a file.  I want to split
> it into those lines that contain a substring, and those that don't.  I
> want it to be more efficient and prettier than
>
> with = [x for x in lines if substring in x]
> without = [x for x in lines if substring not in x]
>
> Does this exist?
>
> TIA,
> Michael

Try this:

 > type lines.txt
the
quick
brown
fox
jumps
over
the
lazy
dog

 > type pivot.py

def pivot(pivot_function, filename):
     a_list = []
     b_list = []
     for line in open(filename):
         target_list = a_list if pivot_function(line) else b_list
         target_list.append(line[:-1])
     return (a_list, b_list)

print pivot(lambda line: 'e' in line, "lines.txt")

 > python pivot.py
(['the', 'over', 'the'], ['quick', 'brown', 'fox', 'jumps', 'lazy', 'dog'])

-John


From python at mrabarnett.plus.com  Thu Mar 11 18:50:13 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 11 Mar 2010 23:50:13 +0000
Subject: pivot() equivalent
In-Reply-To: <e4febcbf-4efd-4a30-948d-43bdbd207e0b@g4g2000yqa.googlegroups.com>
References: <e4febcbf-4efd-4a30-948d-43bdbd207e0b@g4g2000yqa.googlegroups.com>
Message-ID: <4B9981B5.4020005@mrabarnett.plus.com>

gundlach wrote:
> I *know* this already exists, but I can't remember where:
> 
> def pivot(func, seq):
>   # I know, a good implementation shouldn't call func() twice per item
>   return ( (x for x in seq if func(x)), (x for x in seq if not
> func(x)) )
> 
> I feel like I read a thread in which this was argued to death, and I
> can't find that either.
> 
> The scenario: I have a sequence of lines from a file.  I want to split
> it into those lines that contain a substring, and those that don't.  I
> want it to be more efficient and prettier than
> 
> with = [x for x in lines if substring in x]
> without = [x for x in lines if substring not in x]
> 
> Does this exist?
> 
The clearest way is just:

def pivot(func, seq):
     with, without = [], []
     for x in seq:
         if func(x):
             with.append(x)
         else:
             without.append(x)
     return with, without


From felix.antoine.fortin at gmail.com  Thu Mar 11 19:03:07 2010
From: felix.antoine.fortin at gmail.com (=?ISO-8859-1?Q?F=E9lix=2DAntoine_Fortin?=)
Date: Thu, 11 Mar 2010 16:03:07 -0800 (PST)
Subject: inspect.stack() and frame
References: <6f3a93d6-5608-467f-a7db-d360a34fe856@i25g2000yqm.googlegroups.com>
	<hnbtus$p5s$1@news.eternal-september.org>
Message-ID: <4988c974-c8d2-46c9-8c57-681ad22fc1bc@upsg2000gro.googlegroups.com>

On Mar 11, 6:22?pm, "Alf P. Steinbach" <al... at start.no> wrote:
> * F lix-Antoine Fortin:
>
> > Given this code :
> > # Experience with frame
> > import sys
> > import inspect
>
> > def foo():
> > ? ? stack = inspect.stack()
> > ? ? print "foo frame : " + str(hex(id(sys._getframe())))
>
> hex returns a string. applying str is therefore redundant.
>

My bad.

>
>
>
>
> > def foo2():
> > ? ? inspect.stack()
> > ? ? print "foo2 frame : " + str(hex(id(sys._getframe())))
>
> > def bar():
> > ? ? print "bar frame : " + str(hex(id(sys._getframe())))
>
> > foo()
> > foo()
>
> > foo2()
> > foo2()
>
> > bar()
> > bar()
>
> > Output example :
> > foo frame : 0x84d2c0
> > foo frame : 0x844bf0
> > foo2 frame : 0x898c90
> > foo2 frame : 0x898c90
> > bar frame : 0x898f70
> > bar frame : 0x898f70
>
> > Why are the ids (address) of the frame for each foo call not the same?
>
> You're dealing with Python objects. You're not dealing with the computer's
> machine stack. Whether you get the same id for two objects whose lifetimes don't
> overlap depends on the implementation's memory and id allocation strategy.
>

Okay, I thought I got that when I read the id documentation, but now I
get it.
So the only to compare two ids, is by making sure their lifetimes
overlap. In
this case, instead of keeping the ids, I have to keep a reference on
the frame
to make sure it is still alive when I will compare it with a second
one.

Thanks!

> > Or why the call to "stack = inspect.stack()" change the address of the
> > frame?
>
> Does it?
>

Yeah it does... I always get N different id when I run foo() N times
in a row.
Actually, what you said about lifetime applies here too. Here is
another quick
snippet :

import sys
import inspect

def foo():
    stack = inspect.stack()
    return sys._getframe()

def foo2():
    stack = inspect.stack()
    del stack
    return sys._getframe()

def bar():
        inspect.stack()
        return sys._getframe()

frame_foo = foo()
frame_foo2 = foo2()
frame_bar = bar()

print sys.getrefcount(frame_foo)
print sys.getrefcount(frame_foo2)
print sys.getrefcount(frame_bar)

Output :
3
2
2

So it seems that there is one more reference to the foo frame because
only because of "stack = inspect.stack()", so its lifetime isn't done
contrary to foo2 and bar frame, and the frame id of a foo frame is
different for each call.

Now, what is keeping a reference on foo frame?

Thanks Alf,

Felix



From gagsl-py2 at yahoo.com.ar  Thu Mar 11 20:22:51 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 11 Mar 2010 22:22:51 -0300
Subject: EOFError: EOF when reading a line
References: <aaf3117e-8612-43f7-82dd-dcb628db5fd0@l12g2000prg.googlegroups.com>
Message-ID: <op.u9fksdx9x6zn5v@lepton.softlabbsas.com.ar>

En Thu, 11 Mar 2010 06:12:02 -0300, Mihir Patel <mihir3445 at gmail.com>  
escribi?:

> I am trying to use the subprocess to send the data to child process. I
> am not sure why i keep getting  "EOFError: EOF when reading a line"
>
> command_line = 'python test_input.py'
> p =subprocess.Popen(command_line, shell=True, stdin=subprocess.PIPE,
> stdout=subprocess.PIPE)
> print 'output:', p.communicate()[0]
>
> o,e = p.communicate('test')

You may call communicate at most once.

-- 
Gabriel Genellina



From albert at spenarnc.xs4all.nl  Thu Mar 11 20:33:12 2010
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 12 Mar 2010 01:33:12 GMT
Subject: My four-yorkshireprogrammers contribution
References: <20100224212303.242222c6@geekmail.INVALID>
	<7v9e3rFl7mU1@mid.individual.net> <mailman.294.1267719244
	<7vdo8sFrelU1@mid.individual.net>
Message-ID: <kz5azc.gmz@spenarnc.xs4all.nl>

In article <7vdo8sFrelU1 at mid.individual.net>,
Gregory Ewing  <greg.ewing at canterbury.ac.nz> wrote:
>MRAB wrote:
>
>> By the standards of just a few years later, that's not so much a
>> microcomputer as a nanocomputer!
>
>Although not quite as nano as another design published
>in EA a couple of years earlier, the EDUC-8:
>
>   http://www.sworld.com.au/steven/educ-8/
>
>It had a *maximum* of 256 bytes -- due to the architecture,
>there was no way of addressing any more. Also it was
>divided into 16-byte pages, with indirect addressing
>required to access anything in a different page from
>the instruction. Programming for it must have been
>rather challenging.
>
>As far as I know, the EDUC-8 is unique in being the
>only computer design ever published in a hobby magazine
>that *wasn't* based on a microprocessor -- it was all
>built out of 9000 and 7400 series TTL logic chips!

There was the 74 computer in Elektuur (now Elektor).
That was a quite respectable computer, built (you guessed)
from 74-series chips. How many were built, I don't know.

>
>--
>Greg

Groetjes Albert

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- being exponential -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From steve at holdenweb.com  Thu Mar 11 20:43:44 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 11 Mar 2010 20:43:44 -0500
Subject: file seek is slow
In-Reply-To: <5fab36b5-8f04-4e17-98c0-67aab24bb239@u19g2000prh.googlegroups.com>
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>	<daf5c75e-8139-4a4a-8c27-5cef00327bb1@o3g2000yqb.googlegroups.com>
	<d86f1068-8cd4-4489-af00-450d407baf41@g28g2000prb.googlegroups.com>
	<RwVln.12295$pv.5770@news-server.bigpond.net.au>	<e8a9a95f-77b3-43ce-8110-8c6babaa6f26@z4g2000yqa.googlegroups.com>	<781d69b1-c5e1-4013-9015-4983dbfaa4d7@k6g2000prg.googlegroups.com>
	<5fab36b5-8f04-4e17-98c0-67aab24bb239@u19g2000prh.googlegroups.com>
Message-ID: <hnc6ae$ref$1@dough.gmane.org>

Metalone wrote:
> I just tried the seek test with Cython.
> Cython fseek() : 1.059 seconds.  30% slower than 'C'
> Python f.seek  : 1.458 secondds. 80% slower than 'C'.
> 
> It is amazing to me that Cython generates a 'C' file that is 1478
> lines.
> 
And what response are you seeking to your amazement?

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From albert at spenarnc.xs4all.nl  Thu Mar 11 20:49:47 2010
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 12 Mar 2010 01:49:47 GMT
Subject: Docstrings considered too complicated
References: <20100224212303.242222c6@geekmail.INVALID>
	<7v69rcFcmeU1@mid.individual.net> <hmltsi$jcd$1@reader1.panix.com>
	<hmlvas$2a6$1@reader1.panix.com>
Message-ID: <kz5bqz.gti@spenarnc.xs4all.nl>

In article <hmlvas$2a6$1 at reader1.panix.com>,
Grant Edwards  <invalid at invalid.invalid> wrote:
>On 2010-03-03, Grant Edwards <invalid at invalid.invalid> wrote:
>> On 2010-03-03, Gregory Ewing <greg.ewing at canterbury.ac.nz> wrote:
>>> Grant Edwards wrote:
>>>
>>>> Just a mediocre copy of the CP/M filesystem, which was in turn
>>>> copied from DEC's RSTS or RSX.
>>>
>>> It was actually an improvement over CP/M's file system. CP/M
>>> didn't have hierarchical directories
>>
>> Neither did the original MS-DOS filesystem.
>>
>>> or timestamps and recorded file sizes in 128-byte blocks
>>> rather than bytes.
>>
>> I thought that was true of the original MS-DOS filesystem as
>> well, but I wouldn't bet money on it.
>
>I definitely remember that old MS-DOS programs would treat
>Ctrl-Z as an EOF marker when it was read from a text file and
>would terminate a text file with a Ctrl-Z when writing one.
>
>I don't know if that was because the underlying filesystem was
>still did everything in blocks or if it was because those
>MS-DOS programs were direct ports of CP/M programs.  I would
>have sworn that the orignal MS-DOS file API was FCB based and
>worked almost exactly like CP/M.  IIRC, the "byte stream" API
>showed up (in the OS) sever versions later.  The byte stream
>API was implemented by many compiler vendor's C libraries on
>top of the block-oriented FCB API.

My programming reference manual for MSDOS 6.0 (1993)
states the FCB stuff as "superseded" (not obsolete or obsolescent).
It states:
"A programmer should not use a superseded function except to
maintain compatibility with versions of MS-DOS earlier than
version 2.0."

FCB did *not* support paths, but you could access the current
directory.

>--
>Grant Edwards               grant.b.edwards        Yow! I had a lease on an

Groetjes Albert

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- being exponential -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From ldo at geek-central.gen.new_zealand  Thu Mar 11 22:15:23 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 12 Mar 2010 16:15:23 +1300
Subject: Reverse engineering CRC?
References: <7vj7fdFnnjU1@mid.individual.net>
	<4b947298$0$8836$c3e8da3@news.astraweb.com>
	<mailman.452.1268043207.23598.python-list@python.org>
Message-ID: <hncbkc$vkr$2@lust.ihug.co.nz>

In message <mailman.452.1268043207.23598.python-list at python.org>, Dave Angel 
wrote:

> However, if there's anything in there about how to derive the polynomial
> algorithm from (a few) samples I missed it entirely.

Given that CRC is all just a sequence of xor operations, what happens if you 
xor various pairs of CRCs together, wouldn?t that cancel out at least parts 
of the operations?


From ldo at geek-central.gen.new_zealand  Thu Mar 11 22:16:56 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 12 Mar 2010 16:16:56 +1300
Subject: Reverse engineering CRC?
References: <7vj7fdFnnjU1@mid.individual.net>
	<4b9471ee$0$8836$c3e8da3@news.astraweb.com>
	<7vk3eiFtivU1@mid.individual.net>
	<mailman.459.1268053659.23598.python-list@python.org>
	<7vlameF7goU1@mid.individual.net>
Message-ID: <hncbn9$vkr$3@lust.ihug.co.nz>

In message <7vlameF7goU1 at mid.individual.net>, Gregory Ewing wrote:

> I'm going by the fact that the application reports a
> "CRC mismatch" when it's wrong. I can't be sure that what
> it calls a "CRC" is really a true CRC, but it's more than
> a simple sum, because changing one bit in the file results
> in a completely different value.

They could be using a strong cryptographic hash and truncating it to 16 bits 
or something.

In which case you?ve got your work cut out for you...


From steve at REMOVE-THIS-cybersource.com.au  Thu Mar 11 22:24:39 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 12 Mar 2010 03:24:39 GMT
Subject: Can't define __call__ within __init__?
References: <mailman.544.1268226754.23598.python-list@python.org>
	<pan.2010.03.11.03.18.47@REMOVE.THIS.cybersource.com.au>
	<b1a8cceb-ca90-4f84-9cdf-8f07cb116a94@l24g2000prh.googlegroups.com>
Message-ID: <4b99b3f7$0$27822$c3e8da3@news.astraweb.com>

On Thu, 11 Mar 2010 08:20:14 -0800, Steve Howell wrote:

>> (2) special methods like __call__ are only called on the class, not the
>> instance, so you can't give each instance its own method.
>>
>>
> Are you sure about that?  This program prints 1, 2, 1, 2.

The rules for classic classes are different. Since classic classes have 
gone away in 3.0, and are becoming rarer in 2.x, I didn't bother to 
mention the complication.



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Thu Mar 11 22:30:02 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 12 Mar 2010 03:30:02 GMT
Subject: Can't define __call__ within __init__?
References: <mailman.544.1268226754.23598.python-list@python.org>
	<pan.2010.03.11.03.18.47@REMOVE.THIS.cybersource.com.au>
	<mailman.609.1268312412.23598.python-list@python.org>
Message-ID: <4b99b53a$0$27822$c3e8da3@news.astraweb.com>

On Thu, 11 Mar 2010 07:56:59 -0500, Neal Becker wrote:

> The example I showed was just a toy problem.  The real problem is I
> expect to call a function many times, and I want to avoid the overhead
> of the 'if blah' everytime.

Unless the __call__ methods are very small, the overhead of one extra if 
and one extra attribute lookup will be insignificant.


-- 
Steven


From lin.jianying at hotmail.com  Thu Mar 11 22:55:13 2010
From: lin.jianying at hotmail.com (marrylin)
Date: Thu, 11 Mar 2010 19:55:13 -0800 (PST)
Subject: Hello,everybody,the good shoping place,the new year approaching, 
	click in. Let's facelift bar!
Message-ID: <f1e3a910-8fdc-4c09-a33d-43ae591ba8c1@f8g2000yqn.googlegroups.com>

Hello,everybody,the good shoping place,the new year approaching, click
in. Let's facelift bar!
===== HTTP://steezeclothing.com   ====

Air jordan(1-24)shoes $33

UGG BOOT $50

Nike shox(R4,NZ,OZ,TL1,TL2,TL3) $35

Handbags(Coach lv fendi d&g) $35

Tshirts (Polo ,ed hardy,lacoste) $16

Jean(True Religion,ed hardy,coogi) $30

Sunglasses(Oakey,coach,gucci,Armaini) $16

New era cap $15

Bikini (Ed hardy,polo) $25

FREE SHIPPING


From python at bdurham.com  Fri Mar 12 00:41:16 2010
From: python at bdurham.com (python at bdurham.com)
Date: Fri, 12 Mar 2010 00:41:16 -0500
Subject: Any downsides to UPX-ing my 32-bit Python 2.6.4 EXE/PYD/DLL files?
Message-ID: <1268372476.27561.1364429171@webmail.messagingengine.com>

Are there any downsides to UPX-ing my 32-bit Python 2.6.4
development environment EXE/PYD/DLL files?

The reason I'm asking is that I frequently use a custom PY2EXE
script that UPX's copies of these files on every build.

Yes, I could get fancy and try to cache UPXed files, but I think
a simpler, safer, and higher performance solution would be for me
to just UPX my Python 2.6.4 directory once and be done with it.

What are your thoughts?

Malcolm
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From gandalf at shopzeus.com  Fri Mar 12 00:48:52 2010
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Fri, 12 Mar 2010 06:48:52 +0100
Subject: sqlite3 is sqlite 2?
Message-ID: <4B99D5C4.8070100@shopzeus.com>

gandalf at ubuntu:~$ python
Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
[GCC 4.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
 >>> import sqlite3
 >>> sqlite3.version
'2.4.1'

Is it possible to install a real sqlite version 3 somehow? I really need 
it because I have to use savepoint/rollback to. That is only supported 
from sqlite 3.6.8. Is it enough if I upgrade to Ubuntu Karmic? I know 
that is not a question about Python itself.

But still, it is interesting that a module named "sqlite3" can actually 
be used for something called "sqlite 2".

Thanks

   Laszlo



From pmaupin at gmail.com  Fri Mar 12 01:02:54 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Fri, 12 Mar 2010 00:02:54 -0600
Subject: ANNOUNCE: RSON v 0.02 available
Message-ID: <d09829f51003112202q226a8da5hbe79d747f000be42@mail.gmail.com>

RSON (Readable Serial Object Notation) is a superset of JSON that is
suitable for files that humans have to edit and diff.

The current release is decoder-only, but the decoder will read files
encoded by JSON encoders such as json or simplejson.

The current release consists of a single Python module and a short
manual.  The manual admittedly needs some work, but has a few syntax
examples.

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


From gagsl-py2 at yahoo.com.ar  Fri Mar 12 01:11:44 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 12 Mar 2010 03:11:44 -0300
Subject: inspect.stack() and frame
References: <6f3a93d6-5608-467f-a7db-d360a34fe856@i25g2000yqm.googlegroups.com>
	<hnbtus$p5s$1@news.eternal-september.org>
	<4988c974-c8d2-46c9-8c57-681ad22fc1bc@upsg2000gro.googlegroups.com>
Message-ID: <op.u9fx5uc9x6zn5v@lepton.softlabbsas.com.ar>

En Thu, 11 Mar 2010 21:03:07 -0300, F?lix-Antoine Fortin  
<felix.antoine.fortin at gmail.com> escribi?:
> On Mar 11, 6:22 pm, "Alf P. Steinbach" <al... at start.no> wrote:
>> * F lix-Antoine Fortin:
>>
>> > Given this code :
>> > # Experience with frame
>> > import sys
>> > import inspect
>>
>> > def foo():
>> >     stack = inspect.stack()
>> >     print "foo frame : " + str(hex(id(sys._getframe())))
>>
>> > def foo2():
>> >     inspect.stack()
>> >     print "foo2 frame : " + str(hex(id(sys._getframe())))
>>
>> > def bar():
>> >     print "bar frame : " + str(hex(id(sys._getframe())))
>>
>> > foo()
>> > foo()
>>
>> > foo2()
>> > foo2()
>>
>> > bar()
>> > bar()
>>
>> > Output example :
>> > foo frame : 0x84d2c0
>> > foo frame : 0x844bf0
>> > foo2 frame : 0x898c90
>> > foo2 frame : 0x898c90
>> > bar frame : 0x898f70
>> > bar frame : 0x898f70
>>
>> > Why are the ids (address) of the frame for each foo call not the same?
>>
>> You're dealing with Python objects. You're not dealing with the  
>> computer's
>> machine stack. Whether you get the same id for two objects whose  
>> lifetimes don't
>> overlap depends on the implementation's memory and id allocation  
>> strategy.
>>
>
> Okay, I thought I got that when I read the id documentation, but now I
> get it.
> So the only to compare two ids, is by making sure their lifetimes
> overlap. In
> this case, instead of keeping the ids, I have to keep a reference on
> the frame
> to make sure it is still alive when I will compare it with a second
> one.

The best way to compare object identities is using the 'is' operator: `a  
is b` returns true if and only if after evaluating both operands they are  
the very same object.
id() may be misleading if you are not careful:

py> id([]) == id([])
True
py> [] is []
False

>> > Or why the call to "stack = inspect.stack()" change the address of the
>> > frame?
>>
>> Does it?
>
> Yeah it does... I always get N different id when I run foo() N times
> in a row.

Think again after reading the response below.

> Actually, what you said about lifetime applies here too. Here is
> another quick
> snippet :
>
> import sys
> import inspect
>
> def foo():
>     stack = inspect.stack()
>     return sys._getframe()
>
> def foo2():
>     stack = inspect.stack()
>     del stack
>     return sys._getframe()
>
> def bar():
>         inspect.stack()
>         return sys._getframe()
>
> frame_foo = foo()
> frame_foo2 = foo2()
> frame_bar = bar()
>
> print sys.getrefcount(frame_foo)
> print sys.getrefcount(frame_foo2)
> print sys.getrefcount(frame_bar)
>
> Output :
> 3
> 2
> 2
>
> So it seems that there is one more reference to the foo frame because
> only because of "stack = inspect.stack()", so its lifetime isn't done
> contrary to foo2 and bar frame, and the frame id of a foo frame is
> different for each call.
>
> Now, what is keeping a reference on foo frame?

The foo frame keeps a reference to the 'stack' local variable (in its  
f_locals attribute), and 'stack' keeps a reference to the current frame  
too.
This doesn't happen neither in foo2() nor bar(), where the local array is  
empty. inspect.stack() isn't special: any other reference to the current  
frame would have the same effect.

Let's examine the simple example above:

py> id([]) == id([])
True

Python creates an empty list, takes its id, and discards the list. The  
list object is then ready to be re-used again (the interpreter keeps a  
list of free objects for many common types), so the right-hand side gets  
the very same list.

The same thing happens with the frame object in your first examples foo2()  
and bar(): the frame object is discarded after leaving the function, and  
is ready to be used again in the next call. But foo() creates a circular  
reference - the frame object is still alive after leaving the first call,  
so the second call must use a new frame. (The garbage collector will,  
eventually, break the cycle and free those objects, but not very soon).

-- 
Gabriel Genellina



From enleverLesX_XXmcX at XmclavXeauX.com.invalid  Fri Mar 12 01:32:13 2010
From: enleverLesX_XXmcX at XmclavXeauX.com.invalid (Michel Claveau - MVP)
Date: Fri, 12 Mar 2010 07:32:13 +0100
Subject: bypass UAC control through python script (to be run from
	batchfile)
References: <26028cd0-8ead-47d0-95d8-09e2214dddd3@e7g2000yqf.googlegroups.com>
Message-ID: <4b99dff5$0$17899$ba4acef3@reader.news.orange.fr>

Hi !

Install a resident soff (script) by task-planified, in Administrator
rights. Then, call this script from current work, for bypass UAC.

@-salutations
-- 
Michel Claveau


From gandalf at shopzeus.com  Fri Mar 12 01:46:48 2010
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Fri, 12 Mar 2010 07:46:48 +0100
Subject: sqlite savepoint problem (was: Re: sqlite3 is sqlite 2?)
In-Reply-To: <87bpeqzmmv.fsf@castleamber.com>
References: <mailman.752.1268596146.23598.python-list@python.org>
	<87bpeqzmmv.fsf@castleamber.com>
Message-ID: <4B99E358.4020507@shopzeus.com>

>
> That's the sqlite *bindings* version:
>
>   >>> sqlite3.version
>   '2.4.1'
>   >>> sqlite3.sqlite_version
>   '3.6.16'
>   >>>

Thanks. I tried it and RELEASE command didn't work:

 >>> import sqlite3
 >>> conn = sqlite3.connect(':memory:')
 >>> with conn:
...     conn.execute("BEGIN")
...     conn.execute("create table a ( i integer)")
...     conn.execute("insert into a values (1)")
...     conn.execute("savepoint sp1")
...     conn.execute("insert into a values(2)")
...     conn.execute("release sp1")
...     conn.execute("COMMIT")
...
<sqlite3.Cursor object at 0xb7e29b30>
<sqlite3.Cursor object at 0xb7e29b60>
<sqlite3.Cursor object at 0xb7e29b30>
<sqlite3.Cursor object at 0xb7e29b60>
<sqlite3.Cursor object at 0xb7e29b30>
Traceback (most recent call last):
  File "<stdin>", line 7, in <module>
sqlite3.OperationalError: no such savepoint: sp1
 >>>


The syntax is correct: http://www.sqlite.org/lang_savepoint.html
The savepoint was really created.
But I get this error, telling "no such savepoint". What is wrong here? 
Maybe it has to do something with transaction isolation? :-s

Thank you

   Laszlo



From agoretoy at gmail.com  Fri Mar 12 01:52:15 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Fri, 12 Mar 2010 00:52:15 -0600
Subject: execute bash builtins in python
Message-ID: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com>

hi,
i'm trying to write a section of my program that needs to run bash builtin
alias and declare, i've googled and tried every type of example i could find
no to avail. this is what I've tried below and it doesn't work, is there a
way for me to execute a bah builin from python? what i need is to take alias
output and pipe it to another command with python and return the results to
a string or list.

>>> p1=Popen(["alias"],stdout=PIPE)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.6/subprocess.py", line 621, in __init__
    errread, errwrite)
  File "/usr/lib/python2.6/subprocess.py", line 1126, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

if i add shell=True i get empty string and no thins error message

>>> p1=Popen(["alias"],stdout=PIPE,shell=True)
>>> p1
<subprocess.Popen object at 0xb7589a4c>
>>> p1.stdout.read()
''

thank you,
-Alex Goretoy
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From mailinglists at riddergarn.dk  Fri Mar 12 02:11:20 2010
From: mailinglists at riddergarn.dk (John P.)
Date: Fri, 12 Mar 2010 07:11:20 +0000
Subject: Threading, Queue for a function so it only runs once at a time.
Message-ID: <84d41f095f0958519ea44d749793efeb@incoming.servage.net>

Hi, 

Im programming a simple webcrawler with threading for the fun of it, which
is inserting the data fetch into a mysql database, but after continuously
cause my mysql server to produce error during database queries (i assume
its cause because of the many execution at the same time.) the scipt
produces errors.

I figured out i need some kind of queue for the function i use to insert
into the database, to make sure its only called once at a time.

I have looked at the Queue module but its for more complicated than my
current python skills can cope with. :)

Would somebody please help me out here?

Thanks.

--
John P.


From zookog at gmail.com  Fri Mar 12 02:11:37 2010
From: zookog at gmail.com (Zooko O'Whielacronx)
Date: Fri, 12 Mar 2010 00:11:37 -0700
Subject: StringChain -- a data structure for managing large sequences of 
	chunks of bytes
Message-ID: <cd6401a1003112311l296e3ef7k8fc917b0323fd6d7@mail.gmail.com>

Folks:

Every couple of years I run into a problem where some Python code that
worked well at small scales starts burning up my CPU at larger scales,
and the underlying issue turns out to be the idiom of accumulating
data by string concatenation. It just happened again
(http://foolscap.lothar.com/trac/ticket/149 ), and as usual it is hard
to make the data accumulator efficient without introducing a bunch of
bugs into the surrounding code. So this time around I decided to try
encapsulating my preferred more efficient idiom into a reusable class.

So I present to you StringChain, which is an efficient way to
accumulate and process data in many chunks:

http://tahoe-lafs.org/trac/stringchain

Here are some benchmarks generated by running python -OOu -c 'from
stringchain.bench import bench; bench.quick_bench()' as instructed by
the README.txt file.

The N: in the left-hand column is how many bytes were in the test
dataset. The ave rate: number in the right-hand column is how many
bytes per second were processed. "naive" means the string-based idiom
sketched above and "strch" means using the StringChain class.

_buildup init_naive
N:   65536, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:    890, ave
rate: 58350579
N:  131072, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:    265, ave
rate: 34800398
N:  262144, time: best:    0.01,   2th-best:    0.01, ave:    0.01,
2th-worst:    0.01, worst:    0.01 (of      5), reps/s:     79, ave
rate: 20745346
N:  524288, time: best:    0.05,   2th-best:    0.05, ave:    0.05,
2th-worst:    0.05, worst:    0.05 (of      5), reps/s:     20, ave
rate: 10823850
_buildup init_strch
N:   65536, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:  25543, ave
rate: 1674043282
N:  131072, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:  14179, ave
rate: 1858538925
N:  262144, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:   8016, ave
rate: 2101513050
N:  524288, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:   4108, ave
rate: 2154215572
_consume init_naive_loaded
N:   65536, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:    931, ave
rate: 61037862
N:  131072, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:    270, ave
rate: 35454393
N:  262144, time: best:    0.01,   2th-best:    0.01, ave:    0.01,
2th-worst:    0.01, worst:    0.01 (of      5), reps/s:     74, ave
rate: 19471963
N:  524288, time: best:    0.05,   2th-best:    0.05, ave:    0.05,
2th-worst:    0.05, worst:    0.06 (of      5), reps/s:     19, ave
rate: 10146747
_consume init_strch_loaded
N:   65536, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:   4309, ave
rate: 282447500
N:  131072, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:   2313, ave
rate: 303263357
N:  262144, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:   1186, ave
rate: 311159052
N:  524288, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:    606, ave
rate: 317814669
_randomy init_naive
N:   65536, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:    479, ave
rate: 31450561
N:  131072, time: best:    0.01,   2th-best:    0.01, ave:    0.01,
2th-worst:    0.01, worst:    0.01 (of      5), reps/s:    140, ave
rate: 18461191
N:  262144, time: best:    0.02,   2th-best:    0.02, ave:    0.02,
2th-worst:    0.03, worst:    0.03 (of      5), reps/s:     42, ave
rate: 11127714
N:  524288, time: best:    0.06,   2th-best:    0.07, ave:    0.08,
2th-worst:    0.08, worst:    0.09 (of      5), reps/s:     13, ave
rate:  6906341
_randomy init_strch
N:   65536, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:    973, ave
rate: 63827127
N:  131072, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:    495, ave
rate: 64970669
N:  262144, time: best:    0.00,   2th-best:    0.00, ave:    0.00,
2th-worst:    0.00, worst:    0.00 (of      5), reps/s:    239, ave
rate: 62913360
N:  524288, time: best:    0.01,   2th-best:    0.01, ave:    0.01,
2th-worst:    0.01, worst:    0.01 (of      5), reps/s:    121, ave
rate: 63811569

The naive approach is slower than the StringChain class, and the
bigger the dataset the slower it goes. The StringChain class is fast
and also it is scalable (with regard to these benchmarks at least...).

Thanks!

Regards,

Zooko


From no.email at nospam.invalid  Fri Mar 12 02:20:08 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Thu, 11 Mar 2010 23:20:08 -0800
Subject: StringChain -- a data structure for managing large sequences of
	chunks of bytes
References: <mailman.646.1268377905.23598.python-list@python.org>
Message-ID: <7xd3za6m6v.fsf@ruckus.brouhaha.com>

"Zooko O'Whielacronx" <zookog at gmail.com> writes:
> Every couple of years I run into a problem where some Python code that
> worked well at small scales starts burning up my CPU at larger scales,
> and the underlying issue turns out to be the idiom of accumulating
> data by string concatenation. 

I usually use StringIO or cStringIO for that (python 2.x syntax):

   buf = cStringIO()
   buf.write("first thing")
   buf.write("second thing")
   result = buf.getvalue()

Sometimes I like to use a generator instead:

  def stuff():
     yield "first thing"
     yield "second thing"

  result = ''.join(stuff())


From martin at v.loewis.de  Fri Mar 12 02:31:42 2010
From: martin at v.loewis.de (Martin v. Loewis)
Date: Fri, 12 Mar 2010 08:31:42 +0100
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
In-Reply-To: <72a0d93e-50f8-415b-aa74-5d7abe6d8523@z11g2000yqz.googlegroups.com>
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>
	<mailman.619.1268324988.23598.python-list@python.org>
	<4B992FB5.8090207@v.loewis.de>
	<72a0d93e-50f8-415b-aa74-5d7abe6d8523@z11g2000yqz.googlegroups.com>
Message-ID: <4B99EDDE.5070604@v.loewis.de>

> I?m sorry everyone. I didn?t realise I had installed the 64-bit
> version of Python. Well, at least someone else might find have the
> same problem. But I think that there is going to be a bit of a rough
> patch as everyone moves over to 64-bit.

Expect that move to take a few more years. 64-bit CPUs were introduced
more than ten years ago (e.g. Alpha, in 1992), and only slowly reach
"the masses". People typically still don't have more than 4GiB of memory
in their desktop PCs or laptops, so users who do install 64-bit
operating systems on such hardware are still early adaptors.

Regards,
Martin


From gandalf at shopzeus.com  Fri Mar 12 02:32:21 2010
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Fri, 12 Mar 2010 08:32:21 +0100
Subject: sqlite savepoint problem
In-Reply-To: <1268600658.2846.17.camel@durian>
References: <mailman.752.1268596146.23598.python-list@python.org>	
	<87bpeqzmmv.fsf@castleamber.com> <4B99E358.4020507@shopzeus.com>
	<1268600658.2846.17.camel@durian>
Message-ID: <4B99EE05.8060505@shopzeus.com>


> From memory you can't issue a "CREATE TABLE" statement inside a
> transaction, at least not at the default isolation level.  Such a
> statement will automatically commit the current transaction.  Doesn't
> help with your current problem but worth pointing out :-)
>   
Thank you. I'll keep in mind.
> When debugging strange transaction behaviour, I find it easiest to
> create the connection with isolation_level=None so that are no implicit
> transactions being created behind your back.  Not sure why, but setting
> this makes your example work for me.
>   
Yes, same for me. But setting it to None means auto commit mode! See here:

http://docs.python.org/library/sqlite3.html#sqlite3-controlling-transactions


But it does not work that way. Look at this example

import sqlite3

conn = sqlite3.connect(':memory:')
conn.isolation_level = None
with conn:
    conn.execute("create table a ( i integer ) ")

with conn:
    conn.execute("insert into a values (1)")
    conn.execute("SAVEPOINT sp1")
    conn.execute("insert into a values (2)")
    conn.execute("SAVEPOINT sp2")
    conn.execute("insert into a values (3)")
    conn.execute("ROLLBACK TO sp2")
    conn.execute("insert into a values (4)")
    conn.execute("RELEASE sp1")

with conn:
    for row in conn.execute("select * from a"):
        print row
       

It prints:

(1,)
(2,)
(4,)

So everything is working. Nothing is auto commited. But if I change it 
to "DEFERRED" or "IMMEDIATE" or "EXCLUSIVE" then it won't work. Why?

I'm now confused. Also, I could not find anything about these isolation 
levels on the sqlite website. The only think I could find is "PRAGMA 
read_uncommited". If that is the same as setting isolation_level to 
None, then I don't want it.

   L





From gandalf at shopzeus.com  Fri Mar 12 02:48:33 2010
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Fri, 12 Mar 2010 08:48:33 +0100
Subject: sqlite savepoint problem
In-Reply-To: <4B99EE05.8060505@shopzeus.com>
References: <mailman.752.1268596146.23598.python-list@python.org>		<87bpeqzmmv.fsf@castleamber.com>
	<4B99E358.4020507@shopzeus.com>	<1268600658.2846.17.camel@durian>
	<4B99EE05.8060505@shopzeus.com>
Message-ID: <4B99F1D1.2070202@shopzeus.com>


>
> I'm now confused. Also, I could not find anything about these 
> isolation levels on the sqlite website. The only think I could find is 
> "PRAGMA read_uncommited". If that is the same as setting 
> isolation_level to None, then I don't want it.
Yes, it is. Here is a test:

import os
import sqlite3
import threading
import time

FPATH = '/tmp/test.sqlite'
if os.path.isfile(FPATH):
    os.unlink(FPATH)

def getconn():
    global FPATH
    conn = sqlite3.connect(FPATH)
    conn.isolation_level = None
    return conn

class Thr1(threading.Thread):
    def run(self):
        conn = getconn()
        print "Thr1: Inserting 0,1,2,3,4,5"
        with conn:
            for i in range(6):
                conn.execute("insert into a values (?)",[i])
        print "Thr1: Commited"
        with conn:
            print "Thr1: Selecting all rows:"
            for row in conn.execute("select * from a"):
                print row
            print "Thr1: Wait some..."
            time.sleep(3)
            print "Thr1: Selecting again, in the same transaction"
            for row in conn.execute("select * from a"):
                print row


class Thr2(threading.Thread):
    def run(self):
        conn = getconn()
        with conn:
            print "Thr2: deleting all rows from a"
            conn.execute("delete from a")
            print "Thr2: Now we wait some BEFORE commiting changes."
            time.sleep(3)
            print "Thr2: Will roll back!"
            raise Exception


def main():
    with getconn() as conn:
        conn.execute("create table a ( i integer ) ")
    thr1 = Thr1()
    thr1.start()
    time.sleep(1)
    thr1 = Thr2()
    thr1.start()

main()


And the test result:

Thr1: Inserting 0,1,2,3,4,5
Thr1: Commited
Thr1: Selecting all rows:
(0,)
(1,)
(2,)
(3,)
(4,)
(5,)
Thr1: Wait some...
Thr2: deleting all rows from a
Thr2: Now we wait some BEFORE commiting changes.
Thr1: Selecting again, in the same transaction
Thr2: Will roll back!
Exception in thread Thread-2:
Traceback (most recent call last):
  File "/usr/lib/python2.6/threading.py", line 525, in __bootstrap_inner
    self.run()
  File "test.py", line 44, in run
    raise Exception
Exception


It means that setting isolation_level to None will really allow 
uncommited changes to be read by other transactions! This is sad, and of 
course this is something that I do not want.  If I change it to DEFERRED 
then I get a correct result:

Thr1: Inserting 0,1,2,3,4,5
Thr1: Commited
Thr1: Selecting all rows:
(0,)
(1,)
(2,)
(3,)
(4,)
(5,)
Thr1: Wait some...
Thr2: deleting all rows from a
Thr2: Now we wait some BEFORE commiting changes.
Thr1: Selecting again, in the same transaction
(0,)
(1,)
(2,)
(3,)
(4,)
(5,)
Thr2: Will roll back!

However, then savepoints won't work. Is there any way to use read 
commited (or higher) isolation level, and have savepoints working at the 
same time?

I don't see how would savepoints be useful without at least read 
commited isolation level. :-(

  L



From dr.cg at 126.com  Fri Mar 12 02:51:11 2010
From: dr.cg at 126.com (CHEN Guang)
Date: Fri, 12 Mar 2010 15:51:11 +0800 (CST)
Subject: file seek is slow
Message-ID: <61ca1c62.17647.127515b0539.Coremail.dr.cg@126.com>

 
Metalone wrote:
> I just tried the seek test with Cython.
> Cython fseek() : 1.059 seconds.  30% slower than 'C'
> Python f.seek  : 1.458 secondds. 80% slower than 'C'.
> 
> It is amazing to me that Cython generates a 'C' file that is 1478
> lines.
> 
 
PythoidC ( http://pythoidc.googlecode.com ) generates the shortest 'C' file.
PythoidC is the C language like the Python, by the Python and for the Python.
CHEN Guang
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From stefan_ml at behnel.de  Fri Mar 12 03:15:09 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 12 Mar 2010 09:15:09 +0100
Subject: file seek is slow
In-Reply-To: <61ca1c62.17647.127515b0539.Coremail.dr.cg@126.com>
References: <61ca1c62.17647.127515b0539.Coremail.dr.cg@126.com>
Message-ID: <hnct6d$fcg$1@dough.gmane.org>

CHEN Guang, 12.03.2010 08:51:
> Metalone wrote:
>> I just tried the seek test with Cython.
>> Cython fseek() : 1.059 seconds.  30% slower than 'C'
>> Python f.seek  : 1.458 secondds. 80% slower than 'C'.
>>
>> It is amazing to me that Cython generates a 'C' file that is 1478
>> lines.
>
> PythoidC ( http://pythoidc.googlecode.com ) generates the shortest 'C' file.
> PythoidC is the C language like the Python, by the Python and for the Python.

Except that it's not a language but rather a syntax converter, i.e. it 
doesn't really add any features to the C language but rather restricts 
Python syntax to C language features (plus a bit of header file 
introspection, it seems, but C's preprocessor has a bit of that, too).

Stefan



From gandalf at shopzeus.com  Fri Mar 12 03:35:27 2010
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Fri, 12 Mar 2010 09:35:27 +0100
Subject: sqlite savepoint problem [solved]
In-Reply-To: <1268604831.2846.23.camel@durian>
References: <mailman.752.1268596146.23598.python-list@python.org>	
	<87bpeqzmmv.fsf@castleamber.com> <4B99E358.4020507@shopzeus.com>	
	<1268600658.2846.17.camel@durian> <4B99EE05.8060505@shopzeus.com>	
	<4B99F1D1.2070202@shopzeus.com> <1268604831.2846.23.camel@durian>
Message-ID: <4B99FCCF.5080506@shopzeus.com>


> No it doesn't.  The problem is that using a connection as a context
> manager doesn't do what you think. 
>
> It does *not* start a new transaction on __enter__ and commit it on
> __exit__.  As far as I can tell it does nothing on __enter__ and calls
> con.commit() or con.rollback() on exit.  With isolation_level=None,
> these are no-ops.
>   
Thank you Ryan! You are abolutely right, and thank you for reading the 
source.  Now everything works as I imagined.

The way the context manager and isolation_level works looks very very 
strange to me. Here is a demonstration:

import sqlite3
def getconn():
    conn = sqlite3.connect(':memory:')
    conn.isolation_level = None
    return conn
def main():
    with getconn() as conn:
        conn.execute("create table a ( i integer ) ")
    try:
        conn.execute("insert into a values (1)")
        with conn:
            conn.execute("insert into a values (2)")
            raise Exception
    except:
        print "There was an error"
    for row in conn.execute("select * from a"):
        print row
main()


Output:

There was an error
(1,)
(2,)


Looks like the context manager did not roll back anything. If I remove 
isolation_level=None then I get this:

There was an error

E.g. the context manager rolled back something that was executed outside 
the context. I cannot argue with the implementation - it is that way. 
But this is not what I would expect. I believe I'm not alone with this.

Using your connection manager, everything is perfect:

There was an error
(1,)


The only thing I have left is to implement a connection manager that 
emulates nested transactions, using a stack of savepoints. :-)

Suggestions:

Just for clarity, we should put a comment at the end of the 
documentation here:

http://docs.python.org/library/sqlite3.html#sqlite3-controlling-transactions

I would add at least these things:

#1. By using isolation_level = None, connection objects (used as a 
context manager) WON'T automatically commit or rollback transactions.
#2. Using any isolation level, connection objects WON'T automatically 
begin a transaction.
#3. Possibly, include your connection manager class code, to show how to 
do it "the expected" way.

Also one should clarify in the documentation, what isolation_level does. 
Looks like setting isolation_level to None is not really an "auto commit 
mode". It is not even part of sqlite itself. It is part of the python 
extension.

Thank you again.

   Laszlo



From steve at REMOVE-THIS-cybersource.com.au  Fri Mar 12 03:52:30 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 12 Mar 2010 08:52:30 GMT
Subject: StringChain -- a data structure for managing large sequences of 
	chunks of bytes
References: <mailman.646.1268377905.23598.python-list@python.org>
Message-ID: <4b9a00ce$0$27822$c3e8da3@news.astraweb.com>

On Fri, 12 Mar 2010 00:11:37 -0700, Zooko O'Whielacronx wrote:

> Folks:
> 
> Every couple of years I run into a problem where some Python code that
> worked well at small scales starts burning up my CPU at larger scales,
> and the underlying issue turns out to be the idiom of accumulating data
> by string concatenation. 

I don't mean to discourage you, but the simple way to avoid that is not 
to accumulate data by string concatenation.

The usual Python idiom is to append substrings to a list, then once, at 
the very end, combine into a single string:


accumulator = []
for item in sequence:
    accumulator.append(process(item))
string = ''.join(accumulator)


> It just happened again
> (http://foolscap.lothar.com/trac/ticket/149 ), and as usual it is hard
> to make the data accumulator efficient without introducing a bunch of
> bugs into the surrounding code.

I'm sorry, I don't agree about that at all. I've never come across a 
situation where I wanted to use string concatenation and couldn't easily 
modify it to use the list idiom above.

[...]
> Here are some benchmarks generated by running python -OOu -c 'from
> stringchain.bench import bench; bench.quick_bench()' as instructed by
> the README.txt file.

To be taken seriously, I think you need to compare stringchain to the 
list idiom. If your benchmarks favourably compare to that, then it might 
be worthwhile.



-- 
Steven


From stefan_ml at behnel.de  Fri Mar 12 03:56:00 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 12 Mar 2010 09:56:00 +0100
Subject: file seek is slow
In-Reply-To: <5fab36b5-8f04-4e17-98c0-67aab24bb239@u19g2000prh.googlegroups.com>
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>	<daf5c75e-8139-4a4a-8c27-5cef00327bb1@o3g2000yqb.googlegroups.com>
	<d86f1068-8cd4-4489-af00-450d407baf41@g28g2000prb.googlegroups.com>
	<RwVln.12295$pv.5770@news-server.bigpond.net.au>	<e8a9a95f-77b3-43ce-8110-8c6babaa6f26@z4g2000yqa.googlegroups.com>	<781d69b1-c5e1-4013-9015-4983dbfaa4d7@k6g2000prg.googlegroups.com>
	<5fab36b5-8f04-4e17-98c0-67aab24bb239@u19g2000prh.googlegroups.com>
Message-ID: <hncvj0$o5j$1@dough.gmane.org>

Metalone, 11.03.2010 23:57:
> I just tried the seek test with Cython.
> Cython fseek() : 1.059 seconds.  30% slower than 'C'
> Python f.seek  : 1.458 secondds. 80% slower than 'C'.
>
> It is amazing to me that Cython generates a 'C' file that is 1478
> lines.

Well, it generated an optimised Python interface for your module and made 
it compilable in CPython 2.3 through 3.2. It doesn't look like your C 
module features that. ;)


> #Cython code
>
> import time
>
> cdef int SEEK_SET = 0
>
> cdef extern from "stdio.h":
>      void* fopen(char* filename, char* mode)
>      int fseek(void*, long, int)

Cython ships with a stdio.pxd that you can cimport. It looks like it 
doesn't currently define fseek(), but it defines at least fopen() and FILE. 
Patches are always welcome.


> def main():
>      cdef void* f1 = fopen('video.txt', 'rb')
>      cdef int i=1000000
>      t0 = time.clock()
>      while i>  0:
>         fseek(f1, 0, SEEK_SET)
>         i -= 1
>      delta = time.clock() - t0

Note that the call to time.clock() takes some time, too, so it's not 
surprising that this is slower than hand-written C code. Did you test how 
it scales?

Also, did you look at the generated C code or the annotated Cython code 
(cython -a)? Did you make sure both were compiled with the same CFLAGS?

Also, any reason you're not using a for-in-xrange loop? It shouldn't make a 
difference in speed, it's just more common. You even used a for loop in 
your C code.

Finally, I'm not sure why you think that these 30% matter at all. In your 
original post, you even state that seek-time isn't the "deal breaker", so 
maybe you should concentrate on the real issues?

Stefan



From neo100110 at gmail.com  Fri Mar 12 03:59:19 2010
From: neo100110 at gmail.com (Neo)
Date: Fri, 12 Mar 2010 00:59:19 -0800
Subject: Anything like "Effective Java" for Python?
In-Reply-To: <hn8d98$m0d$1@reader1.panix.com>
References: <hn8d98$m0d$1@reader1.panix.com>
Message-ID: <a3dc3481003120059r35abd3b7of83c8aafd84bdb67@mail.gmail.com>

I have learned java for half a year and now I want to learn Python, should I
learn python 3k or the traditional version?

On Wed, Mar 10, 2010 at 7:19 AM, kj <no.email at please.post> wrote:

>
>
>
> Subject line pretty much says it all: is there a book like "Effective
> Java" for Python.  I.e. a book that assumes that readers are
> experienced programmers that already know the basics of the language,
> and want to focus on more advanced programming issues?
>
> ~K
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From rizwanahmed24 at gmail.com  Fri Mar 12 04:00:48 2010
From: rizwanahmed24 at gmail.com (rizwanahmed24 at gmail.com)
Date: Fri, 12 Mar 2010 01:00:48 -0800 (PST)
Subject: bypass UAC control through python script (to be run from 
	batchfile)
References: <26028cd0-8ead-47d0-95d8-09e2214dddd3@e7g2000yqf.googlegroups.com>
	<4b99dff5$0$17899$ba4acef3@reader.news.orange.fr>
Message-ID: <2351c608-2ad5-4835-a4cb-068f6646ede0@k17g2000yqb.googlegroups.com>


Hi Michel. what is this 'resident soff' script, i cannot find it on
google. Secondly if i was to install something in admin mode, then i
would have installed the application i want to install. The actual
problem is that i dont want to manually run something with admin
rights and install.
still havent got the solution


From jgardner at jonathangardner.net  Fri Mar 12 04:05:27 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Fri, 12 Mar 2010 01:05:27 -0800
Subject: NoSQL Movement?
In-Reply-To: <BABjn.11012$pv.4575@news-server.bigpond.net.au>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<mailman.256.1267655008.23598.python-list@python.org>
	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
Message-ID: <6cc20cea1003120105j626cc519o2271106e088b2e90@mail.gmail.com>

On Wed, Mar 3, 2010 at 2:41 PM, Avid Fan <me at privacy.net> wrote:
> Jonathan Gardner wrote:
>>
>> I see it as a sign of maturity with sufficiently scaled software that
>> they no longer use an SQL database to manage their data. At some point
>> in the project's lifetime, the data is understood well enough that the
>> general nature of the SQL database is unnecessary.
>>
>
> I am really struggling to understand this concept.
>
> Is it the normalised table structure that is in question or the query
> language?
>
> Could you give some sort of example of where SQL would not be the way to go.
> ? The only things I can think of a simple flat file databases.

Sorry for the late reply.

Let's say you have an application that does some inserts and updates
and such. Eventually, you are going to run into a limitation with the
number of inserts and updates you can do at once. The typical solution
to this is to shard your database. However, there are other solutions,
such as storing the files in a different kind of database, one which
is less general but more efficient for your particular data.

Let me give you an example. I worked on a system that would load
recipients for email campaigns into a database table. The SQL database
was nice during the initial design and prototype stage because we
could quickly adjust the tables to add or remove columns and try out
different designs.. However, once our system got popular, the
limitation was how fast we could load recipients into the database.
Rather than make our DB bigger or shard the data, we discovered that
storing the recipients outside of the database in flat files was the
precise solution we needed. Each file represented a different email
campaign. The nature of the data was that we didn't need random
access, just serial access. Storing the data this way also meant
sharding the data was almost trivial. Now, we can load a massive
number of recipients in parallel.

You are going to discover certain patterns in how your data is used
and those patterns may not be best served by a generic relational
database. The relational database will definitely help you discover
and even experiment with these patterns, but eventually, you will find
its limits.

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From jgardner at jonathangardner.net  Fri Mar 12 04:14:26 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Fri, 12 Mar 2010 01:14:26 -0800
Subject: Need advice on starting a Python group
In-Reply-To: <hnb0d1$2el$1@reader1.panix.com>
References: <hnb0d1$2el$1@reader1.panix.com>
Message-ID: <6cc20cea1003120114s44ed833fmf82c06edc7d47ca0@mail.gmail.com>

On Thu, Mar 11, 2010 at 6:57 AM, gb345 <gb345 at invalid.com> wrote:
>
> And even when we've had volunteers, hardly anyone shows up!
>
> Any suggestions would be appreciated.
>

Two things: One, only you and your friend really care. Let that sink
in. No one is going to carry the group but you two, at least
initially.

Two, there's a lot of people at movie theaters and the county fair.
Why? Because it is interesting and fun. Scientists work the same way.
Yes, a lot of people are interested in Python. Why don't you do a bit
of snooping around and see what people want to know about?

Let me give some examples:

* Interactive numeric programming with Python
* Rapid website development with Pylons (Trust me, everyone wants to
make a website.) Show how you are showing off data from one of your
experiments of projects and how easy it is to organize and manage
data.
* How you used Python on your latest and greatest project

Don't expect the audience to participate, except to show up and ask questions.

If you want to build a Python support group, then form an informal
group with your friends. Start a public mailing list and offer Python
advice and support for free. Integrate whatever code your org has with
Python, and manage and maintain that code so others can use it.

Finally, advertise. The more people see "Python", the more they will
be interested. Coca-cola and Pepsi are really good at this!

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From gandalf at shopzeus.com  Fri Mar 12 05:12:39 2010
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Fri, 12 Mar 2010 11:12:39 +0100
Subject: sqlite savepoint problem [solved]
In-Reply-To: <1268639629.2846.48.camel@durian>
References: <mailman.752.1268596146.23598.python-list@python.org>	
	<87bpeqzmmv.fsf@castleamber.com> <4B99E358.4020507@shopzeus.com>	
	<1268600658.2846.17.camel@durian> <4B99EE05.8060505@shopzeus.com>	
	<4B99F1D1.2070202@shopzeus.com> <1268604831.2846.23.camel@durian>	
	<4B99FCCF.5080506@shopzeus.com> <1268639629.2846.48.camel@durian>
Message-ID: <4B9A1397.4010409@shopzeus.com>


>> #1. By using isolation_level = None, connection objects (used as a 
>> context manager) WON'T automatically commit or rollback transactions.
>> #2. Using any isolation level, connection objects WON'T automatically 
>> begin a transaction.
>> #3. Possibly, include your connection manager class code, to show how to 
>> do it "the expected" way.
>>
>> Also one should clarify in the documentation, what isolation_level does. 
>> Looks like setting isolation_level to None is not really an "auto commit 
>> mode". It is not even part of sqlite itself. It is part of the python 
>> extension.
>>     
>
> I think of it as almost the opposite - you have to set
> isolation_level=None to get the unadulterated behaviour of the
> underlying sqlite library. 
>
> I'm sure the devs would appreciate a documentation patch (submission
> details at http://python.org/dev/patches/).  I'm also pretty confident
> that I won't have time to do one up anytime soon :-)
>   
Patch submitted.

http://bugs.python.org/issue8145




From robin at reportlab.com  Fri Mar 12 05:16:44 2010
From: robin at reportlab.com (Robin Becker)
Date: Fri, 12 Mar 2010 10:16:44 +0000
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
In-Reply-To: <72a0d93e-50f8-415b-aa74-5d7abe6d8523@z11g2000yqz.googlegroups.com>
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>	<mailman.619.1268324988.23598.python-list@python.org>	<4B992FB5.8090207@v.loewis.de>
	<72a0d93e-50f8-415b-aa74-5d7abe6d8523@z11g2000yqz.googlegroups.com>
Message-ID: <4B9A148C.7050707@chamonix.reportlab.co.uk>

Following the information from MvL I will try and get the 2.6 pyds built for 
amd64, I see that there's a cross platform compile technique for distutils, but 
am not sure if it applies to bdist_winexe etc etc. I'll have a go at this next week.
-- 
Robin Becker


From greg.ewing at canterbury.ac.nz  Fri Mar 12 06:24:31 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sat, 13 Mar 2010 00:24:31 +1300
Subject: Reverse engineering CRC?
In-Reply-To: <hncbn9$vkr$3@lust.ihug.co.nz>
References: <7vj7fdFnnjU1@mid.individual.net>
	<4b9471ee$0$8836$c3e8da3@news.astraweb.com>
	<7vk3eiFtivU1@mid.individual.net>
	<mailman.459.1268053659.23598.python-list@python.org>
	<7vlameF7goU1@mid.individual.net> <hncbn9$vkr$3@lust.ihug.co.nz>
Message-ID: <7vum06Fj82U1@mid.individual.net>

Lawrence D'Oliveiro wrote:

> They could be using a strong cryptographic hash and truncating it to 16 bits 
> or something.
> 
> In which case you?ve got your work cut out for you...

Nope, I've determined that it's actually a pretty standard
CRC, and it's even using one of the standard polynomials,
0x8005. I'll explain the details of how I figured that
out in my essay.

What confused me initially is that it seems to be adding
a few extra bytes to the checked data that aren't present
in the file. Figuring out what they're supposed to contain
is proving to be quite a headache...

-- 
Greg


From news1234 at free.fr  Fri Mar 12 06:39:50 2010
From: news1234 at free.fr (News123)
Date: Fri, 12 Mar 2010 12:39:50 +0100
Subject: Need advice on starting a Python group
In-Reply-To: <mailman.653.1268385271.23598.python-list@python.org>
References: <hnb0d1$2el$1@reader1.panix.com>
	<mailman.653.1268385271.23598.python-list@python.org>
Message-ID: <4b9a2806$0$22047$426a74cc@news.free.fr>

Jonathan Gardner wrote:
> On Thu, Mar 11, 2010 at 6:57 AM, gb345 <gb345 at invalid.com> wrote:
>> And even when we've had volunteers, hardly anyone shows up!
>>
>> Any suggestions would be appreciated.
>>
> 
> Two things: One, only you and your friend really care. Let that sink
> in. No one is going to carry the group but you two, at least
> initially.
> 
> Two, there's a lot of people at movie theaters and the county fair.
> Why? Because it is interesting and fun. Scientists work the same way.
> Yes, a lot of people are interested in Python. Why don't you do a bit
> of snooping around and see what people want to know about?
> 
> Let me give some examples:
> 
> * Interactive numeric programming with Python
> * Rapid website development with Pylons (Trust me, everyone wants to
> make a website.) Show how you are showing off data from one of your
> experiments of projects and how easy it is to organize and manage
> data.
> * How you used Python on your latest and greatest project
> 
> Don't expect the audience to participate, except to show up and ask questions.
> 
> If you want to build a Python support group, then form an informal
> group with your friends. Start a public mailing list and offer Python
> advice and support for free. Integrate whatever code your org has with
> Python, and manage and maintain that code so others can use it.
> 
> Finally, advertise. The more people see "Python", the more they will
> be interested. Coca-cola and Pepsi are really good at this!
> 


attendance will be very low and be sure nobody cares to check whether
anything happened on this group.

My suggestion is:


I'd suggest to setup a group, to which one can subscribe with mail
notification and for all the old ones perhaps even via nntp ;-) and of
course via a web front end (though I personally hate web groups)

Afterwards you can 'friendly-fore-subscribe' some collegues. ;-)
Just talk about your new cool group during lunch, etc.

Be sure, that most will be to lazy to unsuscribe.

Start discussing interesting topics on this group and then . . .
maybe others start joining. maybo nobody cares and you have just to
accept it.

bye


N


From robin at reportlab.com  Fri Mar 12 06:40:00 2010
From: robin at reportlab.com (Robin Becker)
Date: Fri, 12 Mar 2010 11:40:00 +0000
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
In-Reply-To: <4B992FB5.8090207@v.loewis.de>
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>	<mailman.619.1268324988.23598.python-list@python.org>
	<4B992FB5.8090207@v.loewis.de>
Message-ID: <4B9A2810.9030602@chamonix.reportlab.co.uk>

On 11/03/2010 18:00, Martin v. Loewis wrote:
>
>>> I have a Windows 7 (64bit AMD) machine
......
>
>> Perhaps some expert on the python list knows which versions of VS
>> support 64bit; I do have VS 2005/2008 etc, but I'll probably need to set
>> up a 64bit machine to see if they will install on a 64bit architecture.
>
> For Python 2.6 and later, use VS 2008. This comes with an AMD64
> compiler. You technically don't need a 64-bit Windows, as it supports
> cross-compilation (but you would need a 64-bit Windows to test it).
>
> I personally build Python on a 32-bit machine, and move the MSI to a
> 64-bit machine for testing.
>

OK I've got the VC2008 64bit tools installed on my 32bit build platform, but I'm 
getting build errors because of missing libraries. I assume that's because I 
don't have the python amd64 runtime libraries/dlls etc etc since the errors are 
looking like this

_rl_accel.obj : error LNK2019: unresolved external symbol __imp_Py_FindMethod 
referenced in function Box_getattr
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyObject_Init 
referenced in function Box
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyObject_Malloc 
referenced in function Box
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyList_Type 
referenced in function BoxList_init
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_Py_FatalError 
referenced in function init_rl_accel
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyType_Ready 
referenced in function init_rl_accel
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyType_Type 
referenced in function init_rl_accel
_rl_accel.obj : error LNK2019: unresolved external symbol 
__imp_PyModule_AddObject referenced in function init_rl_accel
_rl_accel.obj : error LNK2019: unresolved external symbol 
__imp_PyErr_NewException referenced in function init_rl_accel
_rl_accel.obj : error LNK2019: unresolved external symbol 
__imp_Py_InitModule4_64 referenced in function init_rl_accel
build\lib.win-amd64-2.6\_rl_accel.pyd : fatal error LNK1120: 69 unresolved externals

I assume I can get those from a working Python amd64 install and stuff on one of 
the compiler paths somehow.
-- 
Robin Becker


From robin at reportlab.com  Fri Mar 12 06:40:00 2010
From: robin at reportlab.com (Robin Becker)
Date: Fri, 12 Mar 2010 11:40:00 +0000
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
In-Reply-To: <4B992FB5.8090207@v.loewis.de>
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>	<mailman.619.1268324988.23598.python-list@python.org>
	<4B992FB5.8090207@v.loewis.de>
Message-ID: <4B9A2810.9030602@chamonix.reportlab.co.uk>

On 11/03/2010 18:00, Martin v. Loewis wrote:
>
>>> I have a Windows 7 (64bit AMD) machine
......
>
>> Perhaps some expert on the python list knows which versions of VS
>> support 64bit; I do have VS 2005/2008 etc, but I'll probably need to set
>> up a 64bit machine to see if they will install on a 64bit architecture.
>
> For Python 2.6 and later, use VS 2008. This comes with an AMD64
> compiler. You technically don't need a 64-bit Windows, as it supports
> cross-compilation (but you would need a 64-bit Windows to test it).
>
> I personally build Python on a 32-bit machine, and move the MSI to a
> 64-bit machine for testing.
>

OK I've got the VC2008 64bit tools installed on my 32bit build platform, but I'm 
getting build errors because of missing libraries. I assume that's because I 
don't have the python amd64 runtime libraries/dlls etc etc since the errors are 
looking like this

_rl_accel.obj : error LNK2019: unresolved external symbol __imp_Py_FindMethod 
referenced in function Box_getattr
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyObject_Init 
referenced in function Box
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyObject_Malloc 
referenced in function Box
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyList_Type 
referenced in function BoxList_init
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_Py_FatalError 
referenced in function init_rl_accel
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyType_Ready 
referenced in function init_rl_accel
_rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyType_Type 
referenced in function init_rl_accel
_rl_accel.obj : error LNK2019: unresolved external symbol 
__imp_PyModule_AddObject referenced in function init_rl_accel
_rl_accel.obj : error LNK2019: unresolved external symbol 
__imp_PyErr_NewException referenced in function init_rl_accel
_rl_accel.obj : error LNK2019: unresolved external symbol 
__imp_Py_InitModule4_64 referenced in function init_rl_accel
build\lib.win-amd64-2.6\_rl_accel.pyd : fatal error LNK1120: 69 unresolved externals

I assume I can get those from a working Python amd64 install and stuff on one of 
the compiler paths somehow.
-- 
Robin Becker



From news1234 at free.fr  Fri Mar 12 06:44:27 2010
From: news1234 at free.fr (News123)
Date: Fri, 12 Mar 2010 12:44:27 +0100
Subject: show image in python
In-Reply-To: <mailman.616.1268320154.23598.python-list@python.org>
References: <d698368f1003101403t519b5efdt94892902026aee0b@mail.gmail.com>
	<mailman.616.1268320154.23598.python-list@python.org>
Message-ID: <4b9a291b$0$21425$426a74cc@news.free.fr>

Philip Semanchuk wrote:
> 
> On Mar 10, 2010, at 5:03 PM, mohamed issolah wrote:
> 
>> Hey, This is my program
>>

>> 18 def Creeimg():
>> 19         """transforme matrice en image"""
>> 20         img = Image.new ("L",(8,8))
>> 21         matrix = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
>> 22         img.putdata(matrix)
>> 23         img.show()
>> 24         img.save(fp="./ana.bmp")
>> 25

>>
>> My probeleme : In line 23 "img.show()" Don't work, normally I show the
>> image

Image show is implemented rather half heartedly (at least on linux)

a potential reasons is:
- you didn not install the correct image viewer tool (You should see an
error message though". Then you could try to install the tool, that
python did not find.


depending on the platform, you might have bugs, that don't allow to view
more than one image at a time / etc.

potentially you might be better of by just using
a hand rolled os.system()
or subprocess.Popen call


bye

N





>> but it's not work, but strangely in line 24 "img.save(fp="./ana.bmp")"
>> it's
>> work
>> WHERE IS THE PROBLEME.
>>
>> I have this error in shell : "(eog:3176): GLib-WARNING **: GError set
>> over
>> the top of a previous GError or uninitialized memory.
>> This indicates a bug in someone's code. You must ensure an error is NULL
>> before it's set.
>> The overwriting error message was: Error in getting image file info "
>>
>>
>> os: ubuntu 9.10
> 
> Hi issolah,
> I don't know what your problem is but I have a few suggestions --
> 1) You say that img.show() doesn't work. How does it fail? Is that where
> you get the GLib warning?
> 2) I'm glad you posted your code, but because it has line numbers, it's
> awkward to copy & paste into a local example. Please show your code
> without line numbers.
> 
> I'm unfamiliar with PIL, so this is just a wild guess, but based on the
> GLib error it seems like you haven't initialized something properly.
> Sorry I couldn't be more helpful. Maybe someone who knows more will answer.
> 
> Good luck
> Philip
> 
> 
> 
> 
> 


From steve at REMOVE-THIS-cybersource.com.au  Fri Mar 12 07:35:57 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 12 Mar 2010 12:35:57 GMT
Subject: Unicode characters in btye-strings
Message-ID: <4b9a352d$0$27822$c3e8da3@news.astraweb.com>

I know this is wrong, but I'm not sure just how wrong it is, or why. 
Using Python 2.x:

>>> s = "???"
>>> print s
???
>>> len(s)
6
>>> list(s)
['\xc3', '\xa9', '\xc3', '\xa2', '\xc3', '\x84']

Can somebody explain what happens when I put non-ASCII characters into a 
non-unicode string? My guess is that the result will depend on the 
current encoding of my terminal.

In this case, my terminal is set to UTF-8. If I change it to ISO 8859-1, 
and repeat the above, I get this:

>>> list("???")
['\xe9', '\xe2', '\xc4']

If I do this:

>>> s = u"???"
>>> s.encode('utf-8')
'\xc3\xa9\xc3\xa2\xc3\x84'
>>> s.encode('iso8859-1')
'\xe9\xe2\xc4'

which at least explains why the bytes have the values which they do.


Thank you,



-- 
Steven


From jeanmichel at sequans.com  Fri Mar 12 07:51:43 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 12 Mar 2010 13:51:43 +0100
Subject: Need advice on starting a Python group
In-Reply-To: <4b9a2806$0$22047$426a74cc@news.free.fr>
References: <hnb0d1$2el$1@reader1.panix.com>	<mailman.653.1268385271.23598.python-list@python.org>
	<4b9a2806$0$22047$426a74cc@news.free.fr>
Message-ID: <4B9A38DF.1020208@sequans.com>

News123 wrote:
> Jonathan Gardner wrote:
>   
>> On Thu, Mar 11, 2010 at 6:57 AM, gb345 <gb345 at invalid.com> wrote:
>>     
>>> And even when we've had volunteers, hardly anyone shows up!
>>>
>>> Any suggestions would be appreciated.
>>>
>>>       
>> Two things: One, only you and your friend really care. Let that sink
>> in. No one is going to carry the group but you two, at least
>> initially.
>>
>> Two, there's a lot of people at movie theaters and the county fair.
>> Why? Because it is interesting and fun. Scientists work the same way.
>> Yes, a lot of people are interested in Python. Why don't you do a bit
>> of snooping around and see what people want to know about?
>>
>> Let me give some examples:
>>
>> * Interactive numeric programming with Python
>> * Rapid website development with Pylons (Trust me, everyone wants to
>> make a website.) Show how you are showing off data from one of your
>> experiments of projects and how easy it is to organize and manage
>> data.
>> * How you used Python on your latest and greatest project
>>
>> Don't expect the audience to participate, except to show up and ask questions.
>>
>> If you want to build a Python support group, then form an informal
>> group with your friends. Start a public mailing list and offer Python
>> advice and support for free. Integrate whatever code your org has with
>> Python, and manage and maintain that code so others can use it.
>>
>> Finally, advertise. The more people see "Python", the more they will
>> be interested. Coca-cola and Pepsi are really good at this!
>>
>>     
>
>
> attendance will be very low and be sure nobody cares to check whether
> anything happened on this group.
>
> My suggestion is:
>
>
> I'd suggest to setup a group, to which one can subscribe with mail
> notification and for all the old ones perhaps even via nntp ;-) and of
> course via a web front end (though I personally hate web groups)
>
> Afterwards you can 'friendly-fore-subscribe' some collegues. ;-)
> Just talk about your new cool group during lunch, etc.
>
> Be sure, that most will be to lazy to unsuscribe.
>
> Start discussing interesting topics on this group and then . . .
> maybe others start joining. maybo nobody cares and you have just to
> accept it.
>
> bye
>
>
> N
>   
Python is not interesting enough by itself to grab students attention. 
It's just a tool to solve some technical problems.

So, either python has a direct benefit on the study itself (meaning it 
can help getting better results), or you'll have to make it intereseting 
as a hobbit. But python is not music, video, dance nor it is related to 
sport, sex or whatever things that usually interest people. So I really 
don't know how to make it interesting, I'm not sure it's even possible 
nor desirable.

Good luck anyway.

JM




From hv at tbz-pariv.de  Fri Mar 12 07:59:54 2010
From: hv at tbz-pariv.de (Thomas Guettler)
Date: Fri, 12 Mar 2010 13:59:54 +0100
Subject: Parsing Email Headers
In-Reply-To: <6e0f6857-bedd-4b23-81af-69dd06a53764@q15g2000yqj.googlegroups.com>
References: <e574cbf6-d7e8-49e8-be87-93c9a59e3d87@z35g2000yqd.googlegroups.com>
	<mailman.633.1268338431.23598.python-list@python.org>
	<91153e11-2980-4218-bc88-c92bda7d517e@z11g2000yqz.googlegroups.com>
	<mailman.636.1268348804.23598.python-list@python.org>
	<6e0f6857-bedd-4b23-81af-69dd06a53764@q15g2000yqj.googlegroups.com>
Message-ID: <7vus6aFm6qU1@mid.individual.net>

T wrote:
> Thanks for your suggestions!  Here's what seems to be working - it's
> basically the same thing I originally had, but first checks to see if
> the line is blank
> 
>                 response, lines, bytes = M.retr(i+1)
>                 # For each line in message
>                 for line in lines:
>                     if not line.strip():
>                         M.dele(i+1)
>                         break
> 
>                     emailMessage = email.message_from_string(line)
>                     # Get fields
>                     fields = emailMessage.keys()
>                     # If email contains "From" field
>                     if emailMessage.has_key("From"):
>                         # Get contents of From field
>                         from_field = emailMessage.__getitem__("From")

Hi T,

wait, this code looks strange.

You delete the email if it contains an empty line? I use something like this:

message='\n'.join(connection.retr(msg_num)[1])

Your code:
emailMessage = email.message_from_string(line)
create an email object from only *one* line!

You retrieve the whole message (you don't save bandwith), but maybe that's
what you want.


  Thomas

-- 
Thomas Guettler, http://www.thomas-guettler.de/
E-Mail: guettli (*) thomas-guettler + de


From steve at holdenweb.com  Fri Mar 12 08:04:19 2010
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 12 Mar 2010 08:04:19 -0500
Subject: Need advice on starting a Python group
In-Reply-To: <4B9A38DF.1020208@sequans.com>
References: <hnb0d1$2el$1@reader1.panix.com>	<mailman.653.1268385271.23598.python-list@python.org>	<4b9a2806$0$22047$426a74cc@news.free.fr>
	<4B9A38DF.1020208@sequans.com>
Message-ID: <hnde5h$92d$1@dough.gmane.org>

Jean-Michel Pichavant wrote:
> News123 wrote:
>> Jonathan Gardner wrote:
>>  
>>> On Thu, Mar 11, 2010 at 6:57 AM, gb345 <gb345 at invalid.com> wrote:
>>>    
>>>> And even when we've had volunteers, hardly anyone shows up!
>>>>
>>>> Any suggestions would be appreciated.
>>>>
>>>>       
>>> Two things: One, only you and your friend really care. Let that sink
>>> in. No one is going to carry the group but you two, at least
>>> initially.
>>>
>>> Two, there's a lot of people at movie theaters and the county fair.
>>> Why? Because it is interesting and fun. Scientists work the same way.
>>> Yes, a lot of people are interested in Python. Why don't you do a bit
>>> of snooping around and see what people want to know about?
>>>
>>> Let me give some examples:
>>>
>>> * Interactive numeric programming with Python
>>> * Rapid website development with Pylons (Trust me, everyone wants to
>>> make a website.) Show how you are showing off data from one of your
>>> experiments of projects and how easy it is to organize and manage
>>> data.
>>> * How you used Python on your latest and greatest project
>>>
>>> Don't expect the audience to participate, except to show up and ask
>>> questions.
>>>
>>> If you want to build a Python support group, then form an informal
>>> group with your friends. Start a public mailing list and offer Python
>>> advice and support for free. Integrate whatever code your org has with
>>> Python, and manage and maintain that code so others can use it.
>>>
>>> Finally, advertise. The more people see "Python", the more they will
>>> be interested. Coca-cola and Pepsi are really good at this!
>>>
>>>     
>>
>>
>> attendance will be very low and be sure nobody cares to check whether
>> anything happened on this group.
>>
>> My suggestion is:
>>
>>
>> I'd suggest to setup a group, to which one can subscribe with mail
>> notification and for all the old ones perhaps even via nntp ;-) and of
>> course via a web front end (though I personally hate web groups)
>>
>> Afterwards you can 'friendly-fore-subscribe' some collegues. ;-)
>> Just talk about your new cool group during lunch, etc.
>>
>> Be sure, that most will be to lazy to unsuscribe.
>>
>> Start discussing interesting topics on this group and then . . .
>> maybe others start joining. maybo nobody cares and you have just to
>> accept it.
>>
>> bye
>>
>>
>> N
>>   
> Python is not interesting enough by itself to grab students attention.
> It's just a tool to solve some technical problems.
> 
> So, either python has a direct benefit on the study itself (meaning it
> can help getting better results), or you'll have to make it intereseting
> as a hobbit. But python is not music, video, dance nor it is related to
> sport, sex or whatever things that usually interest people. So I really
> don't know how to make it interesting, I'm not sure it's even possible
> nor desirable.
> 
> Good luck anyway.
> 
> JM
> 
> 
All the advice you have had is good. You need to turn around your
enthusiasm and look at it from the potential visitor's point of view -
what's in it for them?

You don't say where you are (and your invalid domain doesn't really help
identify that), but if you have any of the superstars from the
scientific Python world around you, invite one of them as a guest speaker.

Take a look on the web - e.g. in pycon.blip.tv, where all the PyCon
talks for the last two years are available. Maybe you could start each
meeting by showing one of those videos? Also take a look to see what
SciPy conferences have made available (though I don't think they do
videos yet).

The PSF has invested hugely in making that information available, and
the more they get used the happier we will be. But mostly it's a matter
of focusing on what your community needs from the group, and providing that.

Good luck!

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Fri Mar 12 08:07:00 2010
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 12 Mar 2010 08:07:00 -0500
Subject: Anything like "Effective Java" for Python?
In-Reply-To: <a3dc3481003120059r35abd3b7of83c8aafd84bdb67@mail.gmail.com>
References: <hn8d98$m0d$1@reader1.panix.com>
	<a3dc3481003120059r35abd3b7of83c8aafd84bdb67@mail.gmail.com>
Message-ID: <hndeai$92d$2@dough.gmane.org>

Neo wrote:
> I have learned java for half a year and now I want to learn Python,
> should I learn python 3k or the traditional version?
> 
That depends on whether you need to use specific libraries that haven't
yet been ported to Python 3. If so then start with Python 2. If not,
start with 3 - the differences are small enough that you can relatively
easily fall back to 2 if you need to get access to non-ported libraries.

regards
 Steve

> On Wed, Mar 10, 2010 at 7:19 AM, kj <no.email at please.post> wrote:
> 
> 
> 
> 
>     Subject line pretty much says it all: is there a book like "Effective
>     Java" for Python.  I.e. a book that assumes that readers are
>     experienced programmers that already know the basics of the language,
>     and want to focus on more advanced programming issues?
> 
>     ~K
>     --
>     http://mail.python.org/mailman/listinfo/python-list
> 
> 


-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Fri Mar 12 08:15:49 2010
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 12 Mar 2010 08:15:49 -0500
Subject: execute bash builtins in python
In-Reply-To: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com>
References: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com>
Message-ID: <hnder4$bvg$1@dough.gmane.org>

alex goretoy wrote:
> hi,
> i'm trying to write a section of my program that needs to run bash
> builtin alias and declare, i've googled and tried every type of example
> i could find no to avail. this is what I've tried below and it doesn't
> work, is there a way for me to execute a bah builin from python? what i
> need is to take alias output and pipe it to another command with python
> and return the results to a string or list.
> 
>>>> p1=Popen(["alias"],stdout=PIPE)
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/usr/lib/python2.6/subprocess.py", line 621, in __init__
>     errread, errwrite)
>   File "/usr/lib/python2.6/subprocess.py", line 1126, in _execute_child
>     raise child_exception
> OSError: [Errno 2] No such file or directory
> 
> if i add shell=True i get empty string and no thins error message
> 
>>>> p1=Popen(["alias"],stdout=PIPE,shell=True)
>>>> p1
> <subprocess.Popen object at 0xb7589a4c>
>>>> p1.stdout.read()
> ''
> 
> thank you,
> -Alex Goretoy
> 
For shell=True I believe you should provide the command as a single
string, not a list of arguments.

>>> p1 = Popen("alias", stdout=PIPE, shell=True)
>>>

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From bartc at freeuk.com  Fri Mar 12 08:38:07 2010
From: bartc at freeuk.com (bartc)
Date: Fri, 12 Mar 2010 13:38:07 GMT
Subject: Need advice on starting a Python group
In-Reply-To: <hnb0d1$2el$1@reader1.panix.com>
References: <hnb0d1$2el$1@reader1.panix.com>
Message-ID: <3trmn.49663$Ym4.35065@text.news.virginmedia.com>


"gb345" <gb345 at invalid.com> wrote in message 
news:hnb0d1$2el$1 at reader1.panix.com...

> A friend of mine and I have been trying to start a
> scientific-programming-oriented Python group in our school (of
> medecine and bio research), with not much success.
>
> The main problem is attendance.  Even though a *ton* of people have
> told us that it's a great idea, that they're *very* interested,
> and have asked to be added to our mailing list, the attendance to
> our first few meeting has never been more than 5, including my
> friend and I.  Last time just he and I showed up.
...
> Still, we have a hard time finding volunteers.
>
> And even when we've had volunteers, hardly anyone shows up!
>
> Any suggestions would be appreciated.

Try and get a girl or two interested in coming to the meetings...

-- 
Bartc





From python at mrabarnett.plus.com  Fri Mar 12 08:40:23 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Fri, 12 Mar 2010 13:40:23 +0000
Subject: StringChain -- a data structure for managing large sequences
	of 	chunks of bytes
In-Reply-To: <4b9a00ce$0$27822$c3e8da3@news.astraweb.com>
References: <mailman.646.1268377905.23598.python-list@python.org>
	<4b9a00ce$0$27822$c3e8da3@news.astraweb.com>
Message-ID: <4B9A4447.8010500@mrabarnett.plus.com>

Steven D'Aprano wrote:
> On Fri, 12 Mar 2010 00:11:37 -0700, Zooko O'Whielacronx wrote:
> 
>> Folks:
>>
>> Every couple of years I run into a problem where some Python code that
>> worked well at small scales starts burning up my CPU at larger scales,
>> and the underlying issue turns out to be the idiom of accumulating data
>> by string concatenation. 
> 
> I don't mean to discourage you, but the simple way to avoid that is not 
> to accumulate data by string concatenation.
> 
> The usual Python idiom is to append substrings to a list, then once, at 
> the very end, combine into a single string:
> 
> 
> accumulator = []
> for item in sequence:
>     accumulator.append(process(item))
> string = ''.join(accumulator)
> 
> 
>> It just happened again
>> (http://foolscap.lothar.com/trac/ticket/149 ), and as usual it is hard
>> to make the data accumulator efficient without introducing a bunch of
>> bugs into the surrounding code.
> 
> I'm sorry, I don't agree about that at all. I've never come across a 
> situation where I wanted to use string concatenation and couldn't easily 
> modify it to use the list idiom above.
> 
> [...]
>> Here are some benchmarks generated by running python -OOu -c 'from
>> stringchain.bench import bench; bench.quick_bench()' as instructed by
>> the README.txt file.
> 
> To be taken seriously, I think you need to compare stringchain to the 
> list idiom. If your benchmarks favourably compare to that, then it might 
> be worthwhile.
> 
IIRC, someone did some work on making concatenation faster by delaying
it until a certain threshold had been reached (in the string class
implementation).


From hiralsmaillist at gmail.com  Fri Mar 12 08:49:04 2010
From: hiralsmaillist at gmail.com (hiral)
Date: Fri, 12 Mar 2010 05:49:04 -0800 (PST)
Subject: result of os.times() is different with 'time' command Options
Message-ID: <16861cbc-4460-4d67-ab46-ff03517173d4@g8g2000pri.googlegroups.com>

Hi,

Python version: 2.6

Script:
def pt(start_time, end_time):
    def ptime(time, time_str):
        min, sec = divmod(time, 60)
        hr, min = divmod(min, 60)
        stmt = time_str + '\t'
        if hr:
            stmt += str(hr) + 'h'
        stmt += str(min) + 'm' + str(sec) + 's'
        print stmt

    if start_time and end_time:
        real_time  = end_time[4] - start_time[4]
        ptime(real_time, "real")
        user_time  = end_time[0] - start_time[0]
        ptime(user_time, "user")
        sys_time   = end_time[1] - start_time[1]
        ptime(sys_time, "sys")

import os, subprocess
cmd = ['ls']
print cmd
t1 = os.times()
subprocess.call(cmd)
t2 = os.times()
pt(t1, t2)
print ".end"


Output:
real    0.0m0.0100000002421s
user    0.0m0.0s
sys     0.0m0.0s


Command:
$ time ls

Output:
real    0m0.007s
user    0m0.000s
sys     0m0.000s


Is this the intended behaviour?

As per the link <http://groups.google.com/group/comp.lang.python/
browse_thread/thread/8032897a30781df/c656a79d4c3268a6> it was fixed in
python 2.5.

Can anybody help.

Thank you.






From hiralsmaillist at gmail.com  Fri Mar 12 08:56:34 2010
From: hiralsmaillist at gmail.com (hiral)
Date: Fri, 12 Mar 2010 05:56:34 -0800 (PST)
Subject: python module/utility equivalent to 'time' (linux) and/or 
	'ntimer'(Windows)
Message-ID: <01b0d61b-eb5f-44dc-862e-e31d64b3b0e9@k24g2000pro.googlegroups.com>

Hi,

Is there any python module/utility available which would report the
time same as 'time' command in linux and/or report time same as
'ntimer' utility in Windows.

Thank you.


From hiralsmaillist at gmail.com  Fri Mar 12 08:59:18 2010
From: hiralsmaillist at gmail.com (hiral)
Date: Fri, 12 Mar 2010 05:59:18 -0800 (PST)
Subject: to create variable from dict
Message-ID: <4859ed52-7276-4617-b25e-902b52cfe7c5@s36g2000prh.googlegroups.com>

Hi,

Is there any way to create variables which name matches with dict key?

For example:
dict1 = {"abc":'1", "def":"2"}

Now I am looking to have variable name abc and it's value be '1' etc.

Pl. suggest.

Thank you.


From felix.antoine.fortin at gmail.com  Fri Mar 12 09:08:09 2010
From: felix.antoine.fortin at gmail.com (=?ISO-8859-1?Q?F=E9lix=2DAntoine_Fortin?=)
Date: Fri, 12 Mar 2010 06:08:09 -0800 (PST)
Subject: inspect.stack() and frame
References: <6f3a93d6-5608-467f-a7db-d360a34fe856@i25g2000yqm.googlegroups.com>
	<hnbtus$p5s$1@news.eternal-september.org>
	<4988c974-c8d2-46c9-8c57-681ad22fc1bc@upsg2000gro.googlegroups.com>
	<mailman.644.1268374305.23598.python-list@python.org>
Message-ID: <b554e528-b6d5-4ffb-bcfa-04a8712cd676@q23g2000yqd.googlegroups.com>

Thanks Gabriel, you resumed quite well what I did discovered after my
second post
by playing with the garbage collector module.

> (The garbage collector will, ?
> eventually, break the cycle and free those objects, but not very soon).

I'm not very familiar with the Python garbage collector, so you may
excuse my
simple question, but how can it break the cycle? I guess the object
will be
freed at least when the program ends, but could it be before that? Is
there a
mechanisme in the garbage collector to detect circular references?

Felix




From albert at spenarnc.xs4all.nl  Fri Mar 12 09:13:55 2010
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 12 Mar 2010 14:13:55 GMT
Subject: Python dos2unix one liner
References: <mailman.323.1267263408.4577.python-list@python.org>
	<4b8a2dde$0$27844$c3e8da3@news.astraweb.com>
	<mailman.13.1267355406.23598.python-list@python.org>
	<hmdlc0$ocq$1@news.eternal-september.org>
Message-ID: <kz6a77.jwy@spenarnc.xs4all.nl>

In article <hmdlc0$ocq$1 at news.eternal-september.org>,
Martin P. Hellwig <martin.hellwig at dcuktec.org> wrote:
>On 02/28/10 11:05, Stefan Behnel wrote:
>> Steven D'Aprano, 28.02.2010 09:48:
>>> There ought to be some kind of competition for the least efficient
>>> solution to programming problems
>>
>> That wouldn't be very interesting. You could just write a code generator
>> that spits out tons of garbage code including a line that solves the
>> problem, and then let it execute the code afterwards. That beast would
>> always win.
>>
>> Stefan
>>
>Well that would be an obvious rule that garbage code that does not
>contribute to the end result (ie can be taken out without affecting the
>end result) would not be allowed. Enforcing the rule is another beast
>though, but I would leave that to the competition.

Thinking of the international obfuscated c contest (iocc).
It is easy to make a mess of a program using the preprocessor.
It is also easy to preprocess then prettyprint the program.
If the result is not obfuscated, it impresses nobody.
Likewise the judges would think nothing of a program with garbage,
and would rate it low, so such rule is unnecessary.

>
>Though the idea of a code generator is solid, but instead of generating
>garbage, produces a virtual machine that implements a generator that
>produces a virtual machine, etc. etc.

That was actually done by Lennart Benschop. He made a Forth program
run by an interpreter written in C.
Although Forthers thought it was straightforward comprehensible
code, it was a winner in the iocc.

>
>--
>mph

Groetjes Albert

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- being exponential -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From emile at fenx.com  Fri Mar 12 09:22:23 2010
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 12 Mar 2010 06:22:23 -0800
Subject: Reverse engineering CRC?
In-Reply-To: <7vum06Fj82U1@mid.individual.net>
References: <7vj7fdFnnjU1@mid.individual.net>	<4b9471ee$0$8836$c3e8da3@news.astraweb.com>	<7vk3eiFtivU1@mid.individual.net>	<mailman.459.1268053659.23598.python-list@python.org>	<7vlameF7goU1@mid.individual.net>
	<hncbn9$vkr$3@lust.ihug.co.nz> <7vum06Fj82U1@mid.individual.net>
Message-ID: <hndiji$nva$1@dough.gmane.org>

On 3/12/2010 3:24 AM Gregory Ewing said...
> What confused me initially is that it seems to be adding
> a few extra bytes to the checked data that aren't present
> in the file. Figuring out what they're supposed to contain
> is proving to be quite a headache...

Length?

Emile





From darcy at druid.net  Fri Mar 12 09:30:51 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Fri, 12 Mar 2010 09:30:51 -0500
Subject: NoSQL Movement?
In-Reply-To: <6cc20cea1003120105j626cc519o2271106e088b2e90@mail.gmail.com>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<mailman.256.1267655008.23598.python-list@python.org>
	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
	<6cc20cea1003120105j626cc519o2271106e088b2e90@mail.gmail.com>
Message-ID: <20100312093051.75022620.darcy@druid.net>

On Fri, 12 Mar 2010 01:05:27 -0800
Jonathan Gardner <jgardner at jonathangardner.net> wrote:
> Let me give you an example. I worked on a system that would load
> recipients for email campaigns into a database table. The SQL database
> was nice during the initial design and prototype stage because we
> could quickly adjust the tables to add or remove columns and try out
> different designs.. However, once our system got popular, the
> limitation was how fast we could load recipients into the database.

Just curious, what database were you using that wouldn't keep up with
you?  I use PostgreSQL and would never consider going back to flat
files.  The only thing I can think of that might make flat files faster
is that flat files are buffered whereas PG guarantees that your
information is written to disk before returning but if speed is more
important than 100% reliability you can turn that off and let PG use
the file system buffering just like flat files.

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


From python.list at tim.thechases.com  Fri Mar 12 09:40:52 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Fri, 12 Mar 2010 08:40:52 -0600
Subject: to create variable from dict
In-Reply-To: <4859ed52-7276-4617-b25e-902b52cfe7c5@s36g2000prh.googlegroups.com>
References: <4859ed52-7276-4617-b25e-902b52cfe7c5@s36g2000prh.googlegroups.com>
Message-ID: <4B9A5274.7080301@tim.thechases.com>

hiral wrote:
> Is there any way to create variables which name matches with dict key?
> 
> For example:
> dict1 = {"abc":'1", "def":"2"}
> 
> Now I am looking to have variable name abc and it's value be '1' etc.

1) you can't because "def" is a reserved word in Python.

2) why do you want to?  This seems to come up about every week or 
so and people STILL want to do it.  Search the archives...you 
won't have to go back too far.

3) once you have it, how do you plan to use the variables?  If 
you don't know what they'll be named ahead of time, how can you 
use them in your code

The usual answer is "don't do that -- just use them as a dict", 
or if you're trying to set up some constants, you can use

   abc, def_, ghi = 1, 2, 3

-tkc









From luismgz at gmail.com  Fri Mar 12 09:50:18 2010
From: luismgz at gmail.com (=?ISO-8859-1?Q?Luis_M=2E_Gonz=E1lez?=)
Date: Fri, 12 Mar 2010 06:50:18 -0800 (PST)
Subject: to create variable from dict
References: <4859ed52-7276-4617-b25e-902b52cfe7c5@s36g2000prh.googlegroups.com>
Message-ID: <ecc59606-b4c2-418f-9cb2-27e9b2c47714@o30g2000yqb.googlegroups.com>

On Mar 12, 10:59?am, hiral <hiralsmaill... at gmail.com> wrote:
> Hi,
>
> Is there any way to create variables which name matches with dict key?
>
> For example:
> dict1 = {"abc":'1", "def":"2"}
>
> Now I am looking to have variable name abc and it's value be '1' etc.
>
> Pl. suggest.
>
> Thank you.

Check out this thread (very recent):
http://groups.google.com/group/comp.lang.python/browse_thread/thread/bb1797ffb6fc3bd7/25fe94103c7a231f?lnk=gst&q=luis+variables#25fe94103c7a231f

Short answer: you can update globals() with a dictionary, as follows:

globals().update( dict1 )

Then you'll have each key-value pair as variables in the global
namespace.
The question is: should you do it?

Luis


From jeanmichel at sequans.com  Fri Mar 12 10:02:24 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 12 Mar 2010 16:02:24 +0100
Subject: to create variable from dict
In-Reply-To: <ecc59606-b4c2-418f-9cb2-27e9b2c47714@o30g2000yqb.googlegroups.com>
References: <4859ed52-7276-4617-b25e-902b52cfe7c5@s36g2000prh.googlegroups.com>
	<ecc59606-b4c2-418f-9cb2-27e9b2c47714@o30g2000yqb.googlegroups.com>
Message-ID: <4B9A5780.90005@sequans.com>

Luis M. Gonz?lez wrote:
> On Mar 12, 10:59 am, hiral <hiralsmaill... at gmail.com> wrote:
>   
>> Hi,
>>
>> Is there any way to create variables which name matches with dict key?
>>
>> For example:
>> dict1 = {"abc":'1", "def":"2"}
>>
>> Now I am looking to have variable name abc and it's value be '1' etc.
>>
>> Pl. suggest.
>>
>> Thank you.
>>     
>
> Check out this thread (very recent):
> http://groups.google.com/group/comp.lang.python/browse_thread/thread/bb1797ffb6fc3bd7/25fe94103c7a231f?lnk=gst&q=luis+variables#25fe94103c7a231f
>
> Short answer: you can update globals() with a dictionary, as follows:
>
> globals().update( dict1 )
>
> Then you'll have each key-value pair as variables in the global
> namespace.
> The question is: should you do it?
>
> Luis
>   
The answer is known: no, he should not do it :o)

JM


From pemerson at gmail.com  Fri Mar 12 10:15:16 2010
From: pemerson at gmail.com (Pete Emerson)
Date: Fri, 12 Mar 2010 07:15:16 -0800 (PST)
Subject: Exiting gracefully from ThreadingTCPServer
Message-ID: <1f31cddf-1104-4579-bd61-5fad3b2c4677@t17g2000prg.googlegroups.com>

I'm trying to get threading going for the first time in python, and
I'm trying to modify code I found so that I can have the server close
the TCP connections and exit gracefully. Two problems:

1) While the KeyboardInterrupt works, if I make more than 0 curls to
the server and then quit, I can't run it again right away and get
this:
socket.error: [Errno 48] Address already in use

Not all of my connections are closing properly. How do I fix this?

2) curling localhost:8080/quit does show the "Quitting" output that I
expect, but doesn't quit the server until I manually control-c it.

I think that I need *all* threads to close and not just the current
one, so I'm not quite sure how to proceed. Pointers in the right
direction are appreciated. And if there's a "better" way to do this
threading httpd server (subjective, I realize), please let me know!
Thanks.

Pete

#############################################
#!/usr/bin/env python

import SocketServer
import SimpleHTTPServer

PORT = 8080
done = False
class CustomHandler(SimpleHTTPServer.SimpleHTTPRequestHandler):
    def do_GET(self):
	global done
	if self.path=='/quit':
            self.send_response(200)
            self.send_header('Content-type','text/html')
            self.end_headers()
            self.wfile.write('Quitting')
            done = True
            return self
        else:
            self.send_response(200)
            self.send_header('Content-type','text/html')
            self.end_headers()
            self.wfile.write('Unknown')
            return self


if __name__ == "__main__":
	httpd = SocketServer.ThreadingTCPServer(('localhost',
PORT),CustomHandler)
	try:
		while not done:
			print "done: ", done
			httpd.handle_request()
	except KeyboardInterrupt:
		print "Server is done."
		httpd.server_close()


From robert.kern at gmail.com  Fri Mar 12 10:37:36 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 12 Mar 2010 09:37:36 -0600
Subject: Unicode characters in btye-strings
In-Reply-To: <4b9a352d$0$27822$c3e8da3@news.astraweb.com>
References: <4b9a352d$0$27822$c3e8da3@news.astraweb.com>
Message-ID: <hndn40$9ve$1@dough.gmane.org>

On 2010-03-12 06:35 AM, Steven D'Aprano wrote:
> I know this is wrong, but I'm not sure just how wrong it is, or why.
> Using Python 2.x:
>
>>>> s = "???"
>>>> print s
> ???
>>>> len(s)
> 6
>>>> list(s)
> ['\xc3', '\xa9', '\xc3', '\xa2', '\xc3', '\x84']
>
> Can somebody explain what happens when I put non-ASCII characters into a
> non-unicode string? My guess is that the result will depend on the
> current encoding of my terminal.

Exactly right.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From robin at reportlab.com  Fri Mar 12 10:44:12 2010
From: robin at reportlab.com (Robin Becker)
Date: Fri, 12 Mar 2010 15:44:12 +0000
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
In-Reply-To: <4B9A2810.9030602@chamonix.reportlab.co.uk>
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>	<mailman.619.1268324988.23598.python-list@python.org>	<4B992FB5.8090207@v.loewis.de>
	<4B9A2810.9030602@chamonix.reportlab.co.uk>
Message-ID: <4B9A614C.1080105@chamonix.reportlab.co.uk>

On 12/03/2010 11:40, Robin Becker wrote:
........
>
> I assume I can get those from a working Python amd64 install and stuff
> on one of the compiler paths somehow.


Not sure if this is a bug; I dug around a bit and find that because of the cross 
compilation distutils is supposed to add an extra library path with the name 
PCbuild\AMD64 when doing x86-->amd64 cross builds.

I tried copying the 2.6.4 amd64 libs/dlls etc etc into c:\python26\PCbuild\AMD64 
and reran my cross build

c:\python26\python setup.py build --plat-name=win-amd64

however, that still gives linker import errors.

Looked in the output I see this

> C:\Program Files\Microsoft Visual Studio 9.0\VC\BIN\x86_amd64\link.exe /DLL /nologo /INCREMENTAL:NO /LIBPATH:C:\python26
> \libs /LIBPATH:C:\python26\PCbuild\amd64 /EXPORT:init_rl_accel build\temp.win-amd64-2.6\Release\_rl_accel.obj /OUT:build
> \lib.win-amd64-2.6\_rl_accel.pyd /IMPLIB:build\temp.win-amd64-2.6\Release\_rl_accel.lib /MANIFESTFILE:build\temp.win-amd
> 64-2.6\Release\_rl_accel.pyd.manifest
>    Creating library build\temp.win-amd64-2.6\Release\_rl_accel.lib and object build\temp.win-amd64-2.6\Release\_rl_accel
> .exp
> _rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyNumber_Int referenced in function _parseSequenceInt
> _rl_accel.obj : error LNK2019: unresolved external symbol __imp_PySequence_GetItem referenced in function _parseSequence


that looks wrong because I'm using 32 bit python to do the build and

/LIBPATH:C:\python26\libs /LIBPATH:C:\python26\PCbuild\amd64

means that the 32 bit libraries are first. Running the linker command by itself 
(without the 32bit libs in the command) works fine ie

> C:\ux\PydBuilder\rl_addons\rl_accel>"C:\Program Files\Microsoft Visual Studio 9.0\VC\BIN\x86_amd64\link.exe" /DLL /nolog
> o /INCREMENTAL:NO /LIBPATH:C:\python26\PCbuild\amd64 /EXPORT:init_rl_accel build\temp.win-amd64-2.6\Release\_rl_accel.ob
> j /OUT:build\lib.win-amd64-2.6\_rl_accel.pyd /IMPLIB:build\temp.win-amd64-2.6\Release\_rl_accel.lib /MANIFESTFILE:build\
> temp.win-amd64-2.6\Release\_rl_accel.pyd.manifest
>    Creating library build\temp.win-amd64-2.6\Release\_rl_accel.lib and object build\temp.win-amd64-2.6\Release\_rl_accel
> .exp

seems to work fine and produce a pyd in build\lib.win-amd64-2.6
-- 
Robin Becker


From robin at reportlab.com  Fri Mar 12 10:44:12 2010
From: robin at reportlab.com (Robin Becker)
Date: Fri, 12 Mar 2010 15:44:12 +0000
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
In-Reply-To: <4B9A2810.9030602@chamonix.reportlab.co.uk>
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>	<mailman.619.1268324988.23598.python-list@python.org>	<4B992FB5.8090207@v.loewis.de>
	<4B9A2810.9030602@chamonix.reportlab.co.uk>
Message-ID: <4B9A614C.1080105@chamonix.reportlab.co.uk>

On 12/03/2010 11:40, Robin Becker wrote:
........
>
> I assume I can get those from a working Python amd64 install and stuff
> on one of the compiler paths somehow.


Not sure if this is a bug; I dug around a bit and find that because of the cross 
compilation distutils is supposed to add an extra library path with the name 
PCbuild\AMD64 when doing x86-->amd64 cross builds.

I tried copying the 2.6.4 amd64 libs/dlls etc etc into c:\python26\PCbuild\AMD64 
and reran my cross build

c:\python26\python setup.py build --plat-name=win-amd64

however, that still gives linker import errors.

Looked in the output I see this

> C:\Program Files\Microsoft Visual Studio 9.0\VC\BIN\x86_amd64\link.exe /DLL /nologo /INCREMENTAL:NO /LIBPATH:C:\python26
> \libs /LIBPATH:C:\python26\PCbuild\amd64 /EXPORT:init_rl_accel build\temp.win-amd64-2.6\Release\_rl_accel.obj /OUT:build
> \lib.win-amd64-2.6\_rl_accel.pyd /IMPLIB:build\temp.win-amd64-2.6\Release\_rl_accel.lib /MANIFESTFILE:build\temp.win-amd
> 64-2.6\Release\_rl_accel.pyd.manifest
>    Creating library build\temp.win-amd64-2.6\Release\_rl_accel.lib and object build\temp.win-amd64-2.6\Release\_rl_accel
> .exp
> _rl_accel.obj : error LNK2019: unresolved external symbol __imp_PyNumber_Int referenced in function _parseSequenceInt
> _rl_accel.obj : error LNK2019: unresolved external symbol __imp_PySequence_GetItem referenced in function _parseSequence


that looks wrong because I'm using 32 bit python to do the build and

/LIBPATH:C:\python26\libs /LIBPATH:C:\python26\PCbuild\amd64

means that the 32 bit libraries are first. Running the linker command by itself 
(without the 32bit libs in the command) works fine ie

> C:\ux\PydBuilder\rl_addons\rl_accel>"C:\Program Files\Microsoft Visual Studio 9.0\VC\BIN\x86_amd64\link.exe" /DLL /nolog
> o /INCREMENTAL:NO /LIBPATH:C:\python26\PCbuild\amd64 /EXPORT:init_rl_accel build\temp.win-amd64-2.6\Release\_rl_accel.ob
> j /OUT:build\lib.win-amd64-2.6\_rl_accel.pyd /IMPLIB:build\temp.win-amd64-2.6\Release\_rl_accel.lib /MANIFESTFILE:build\
> temp.win-amd64-2.6\Release\_rl_accel.pyd.manifest
>    Creating library build\temp.win-amd64-2.6\Release\_rl_accel.lib and object build\temp.win-amd64-2.6\Release\_rl_accel
> .exp

seems to work fine and produce a pyd in build\lib.win-amd64-2.6
-- 
Robin Becker



From python at mrabarnett.plus.com  Fri Mar 12 10:47:10 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Fri, 12 Mar 2010 15:47:10 +0000
Subject: inspect.stack() and frame
In-Reply-To: <b554e528-b6d5-4ffb-bcfa-04a8712cd676@q23g2000yqd.googlegroups.com>
References: <6f3a93d6-5608-467f-a7db-d360a34fe856@i25g2000yqm.googlegroups.com>	<hnbtus$p5s$1@news.eternal-september.org>	<4988c974-c8d2-46c9-8c57-681ad22fc1bc@upsg2000gro.googlegroups.com>	<mailman.644.1268374305.23598.python-list@python.org>
	<b554e528-b6d5-4ffb-bcfa-04a8712cd676@q23g2000yqd.googlegroups.com>
Message-ID: <4B9A61FE.1080407@mrabarnett.plus.com>

F?lix-Antoine Fortin wrote:
> Thanks Gabriel, you resumed quite well what I did discovered after my
> second post
> by playing with the garbage collector module.
> 
>> (The garbage collector will,  
>> eventually, break the cycle and free those objects, but not very soon).
> 
> I'm not very familiar with the Python garbage collector, so you may
> excuse my
> simple question, but how can it break the cycle? I guess the object
> will be
> freed at least when the program ends, but could it be before that? Is
> there a
> mechanisme in the garbage collector to detect circular references?
> 
In CPython objects are reference-counted, which allows an object to be
collected as soon as there are no references to it.

However, this won't take care of circular references, so a secondary
garbage collector was introduced which occasionally looks for
inaccessible objects (garbage) using (probably) mark-and-sweep.


From gabriel.rossetti at arimaz.com  Fri Mar 12 10:50:21 2010
From: gabriel.rossetti at arimaz.com (Gabriel Rossetti)
Date: Fri, 12 Mar 2010 16:50:21 +0100
Subject: Anything like "Effective Java" for Python?
In-Reply-To: <hn8d98$m0d$1@reader1.panix.com>
References: <hn8d98$m0d$1@reader1.panix.com>
Message-ID: <4B9A62BD.7080805@arimaz.com>

kj wrote:
>
> Subject line pretty much says it all: is there a book like "Effective
> Java" for Python.  I.e. a book that assumes that readers are
> experienced programmers that already know the basics of the language,
> and want to focus on more advanced programming issues?
>
> ~K
>   

Effective Java is a good book, it is not like most people responding to 
this topic a "how to program in Java"
book but a "I know how to program in Python, but I want it to run fast 
and use a minimal amount of memory".
I would have liked to have such a book for Python when I was past the 
language learning stage.

Gabriel


From mailinglists at riddergarn.dk  Fri Mar 12 10:56:12 2010
From: mailinglists at riddergarn.dk (John P.)
Date: Fri, 12 Mar 2010 15:56:12 +0000
Subject: Threading, Queue for a function so it only runs once at a time.
In-Reply-To: <6cc20cea1003120054jec2241atc2b85920a64d869c@mail.gmail.com>
References: <84d41f095f0958519ea44d749793efeb@incoming.servage.net>
	<6cc20cea1003120054jec2241atc2b85920a64d869c@mail.gmail.com>
Message-ID: <ebc0d55d6164a9aa280244645f8c6543@incoming.servage.net>

Sorry but its not really an option for me with PostgreSQL. Thanks anyway.

I wonder if there is a simple way of just queueing the run of a function
make it only run once at a time but by multiply threads? :)

On Fri, 12 Mar 2010 00:54:57 -0800, Jonathan Gardner
<jgardner at jonathangardner.net> wrote:
> For lots of transactions running at once, MySQL is a terrible choice.
> Give PostgreSQL a try. It does a much better job with that kind of
> load.
> 
> On Thu, Mar 11, 2010 at 11:11 PM, John P. <mailinglists at riddergarn.dk>
> wrote:
>> Hi,
>>
>> Im programming a simple webcrawler with threading for the fun of it,
>> which
>> is inserting the data fetch into a mysql database, but after
continuously
>> cause my mysql server to produce error during database queries (i
assume
>> its cause because of the many execution at the same time.) the scipt
>> produces errors.
>>
>> I figured out i need some kind of queue for the function i use to
insert
>> into the database, to make sure its only called once at a time.
>>
>> I have looked at the Queue module but its for more complicated than my
>> current python skills can cope with. :)
>>
>> Would somebody please help me out here?
>>


From godson.g at gmail.com  Fri Mar 12 11:13:06 2010
From: godson.g at gmail.com (Godson Gera)
Date: Fri, 12 Mar 2010 21:43:06 +0530
Subject: python module/utility equivalent to 'time' (linux) and/or 
	'ntimer'(Windows)
In-Reply-To: <01b0d61b-eb5f-44dc-862e-e31d64b3b0e9@k24g2000pro.googlegroups.com>
References: <01b0d61b-eb5f-44dc-862e-e31d64b3b0e9@k24g2000pro.googlegroups.com>
Message-ID: <f9822b401003120813m34fec84ka40452b4deae8d7a@mail.gmail.com>

Take a look at hotshot module of python
http://docs.python.org/library/hotshot.html

On Fri, Mar 12, 2010 at 7:26 PM, hiral <hiralsmaillist at gmail.com> wrote:

> Hi,
>
> Is there any python module/utility available which would report the
> time same as 'time' command in linux and/or report time same as
> 'ntimer' utility in Windows.
>
> Thank you.
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Thanks & Regards,
Godson Gera
http://godson.in
http://www.clickindia.com/detail.php?id=493636
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From billy.earney at gmail.com  Fri Mar 12 11:18:59 2010
From: billy.earney at gmail.com (Billy Earney)
Date: Fri, 12 Mar 2010 10:18:59 -0600
Subject: Visual Python programming and decompilers?
In-Reply-To: <95cccfc91003111038y6f07efb2m623122a3b8a60127@mail.gmail.com>
References: <95cccfc91003111038y6f07efb2m623122a3b8a60127@mail.gmail.com>
Message-ID: <4b9a6976.9713f30a.5a73.69a4@mx.google.com>

Ludolph,

This reminds me of the orange project which is developed in python.
http://www.ailab.si/orange/
It is actually for data mining, but many of the concepts could be used for a
more general programming structure.

Billy

-----Original Message-----
From: python-list-bounces+billy.earney=gmail.com at python.org
[mailto:python-list-bounces+billy.earney=gmail.com at python.org] On Behalf Of
Ludolph
Sent: Thursday, March 11, 2010 12:39 PM
To: python-list at python.org
Subject: Visual Python programming and decompilers?

Hi Guys

At work I have been exposed to a Agile Platform called OutSystems. It
allows you to visually program your web applications
http://i.imgur.com/r2F0i.png and I find the idea very intriguing.

So I have started to play around with the idea on how will I be able
to visually represent Python code as in the above image and then allow
the programmer to change some of the flow/code/logic visually and then
get it back as python source code. I don't know if this have been
tried before and after some googling I can't find anything like this,
so maybe I'm just lacking basic googling skills or a python solution
like the above does not exist yet.

If anybody knows of such solution please let me know, so that I don't
spend a lot of time recreating the wheel. Otherwise help me out on the
following problem:

I decided I can use byteplay3 http://pypi.python.org/pypi/byteplay/ to
disassemble the code to workable objects, It even allows me to rebuild
the objects to bytecode. So if I define patterns on how python
interrupts the source code to bytecode I can visually represent this
and also so convert my visual representations back to bytecode.

The only problem I have at the moment is how will I get this bytecode
back to python source code. I have googled for python decompiler but
only found old projects like unpyc, decompyle and some online
services. I would like to know if anybody know of a well maintained or
at least recent module that can help me accomplish the above
mentioned, because I'm hoping I can implement this in Python 3.1.

So any input or suggestion would be greatly appreciated.

Kind Regards,

-- 
Ludolph Neethling
-- 
http://mail.python.org/mailman/listinfo/python-list



From darcy at druid.net  Fri Mar 12 11:22:04 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Fri, 12 Mar 2010 11:22:04 -0500
Subject: Threading, Queue for a function so it only runs once at a time.
In-Reply-To: <ebc0d55d6164a9aa280244645f8c6543@incoming.servage.net>
References: <84d41f095f0958519ea44d749793efeb@incoming.servage.net>
	<6cc20cea1003120054jec2241atc2b85920a64d869c@mail.gmail.com>
	<ebc0d55d6164a9aa280244645f8c6543@incoming.servage.net>
Message-ID: <20100312112204.5513eebb.darcy@druid.net>

On Fri, 12 Mar 2010 15:56:12 +0000
"John P." <mailinglists at riddergarn.dk> wrote:
> Sorry but its not really an option for me with PostgreSQL. Thanks anyway.

Why?  It's your best option.  Any other solutions that you can't use
before people give you more suggestions?

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


From victorsubervi at gmail.com  Fri Mar 12 11:22:19 2010
From: victorsubervi at gmail.com (Victor Subervi)
Date: Fri, 12 Mar 2010 12:22:19 -0400
Subject: Help Troubleshooting
Message-ID: <4dc0cfea1003120822sb08f494nb56c6f9a438204ff@mail.gmail.com>

Hi;
I'm running Pexpect (no discussion list) with the following code:

#! /usr/bin/python
import pexpect

def runVpopmail(whatdo, acct, domain, newpw, oldpw=''):
  if whatdo == 'vadduser':
    child = pexpect.spawn('/home/vpopmail/bin/%s %s@%s %s' % (whatdo, acct,
domain, newpw))
  elif whatdo == 'vchangepw':
    child = pexpect.spawn('/home/vpopmail/bin/%s' % (whatdo))
    child.expect('Please enter the email address: ')
    child.sendline('%s@%s' % (acct, domain))
    child.expect('Enter old password: ')
    child.sendline(oldpw)
    child.expect('Please enter password for %s@%s: ' % (acct, domain))
    child.sendline(newpw)
    child.expect('enter password again: ')
    child.sendline(newpw)
  return child

No matter whether I try to add a user or edit a password, the fn seems to
return that everything is good, but nothing ever happens. When I place a
return of the child value and run it with whatdo==vadduser I get the
following output:

version: 2.3 ($Revision: 399 $) command: /home/vpopmail/bin/vadduser args:
['/home/vpopmail/bin/vadduser', 'test2 at globalsolutionsgroup.vi', 'qqq']
searcher: None buffer (last 100 chars): before (last 100 chars): None after:
None match: None match_index: None exitstatus: None flag_eof: False pid:
1518 child_fd: 3 closed: False timeout: 30 delimiter: pexpect.EOF logfile:
None logfile_read: None logfile_send: None maxread: 2000 ignorecase: False
searchwindowsize: None delaybeforesend: 0.05 delayafterclose: 0.1
delayafterterminate: 0.

I don't know what this means. Any ideas on how to troubleshoot this?
TIA,
beno
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From tim.wintle at teamrubber.com  Fri Mar 12 11:36:32 2010
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Fri, 12 Mar 2010 16:36:32 +0000
Subject: Visual Python programming and decompilers?
In-Reply-To: <95cccfc91003111038y6f07efb2m623122a3b8a60127@mail.gmail.com>
References: <95cccfc91003111038y6f07efb2m623122a3b8a60127@mail.gmail.com>
Message-ID: <1268411792.6354.2.camel@localhost>

On Thu, 2010-03-11 at 20:38 +0200, Ludolph wrote:
> 
> I decided I can use byteplay3 http://pypi.python.org/pypi/byteplay/ to
> disassemble the code to workable objects, It even allows me to rebuild
> the objects to bytecode. So if I define patterns on how python
> interrupts the source code to bytecode I can visually represent this
> and also so convert my visual representations back to bytecode.

Assuming you're on 2.6 or later, I'd suggest working with the ast module
instead:
http://docs.python.org/library/ast.html





From solipsis at pitrou.net  Fri Mar 12 11:48:33 2010
From: solipsis at pitrou.net (Antoine Pitrou)
Date: Fri, 12 Mar 2010 16:48:33 +0000 (UTC)
Subject: Asynchronous HTTP client
References: <b212d954-6eb0-43d3-80ac-6cd854a1a560@b36g2000pri.googlegroups.com>
	<20100307131604.2792.1008062813.divmod.xquotient.1336@localhost.localdomain>
	<30c3a3701003070640y19772987s50b583aa54e535d5@mail.gmail.com>
Message-ID: <hndr90$po8$1@dough.gmane.org>

Le Sun, 07 Mar 2010 22:40:36 +0800, pingooo a ?crit?:
> I'm writing an open source python client for a web service. The client
> may be used in all kinds of environments - Linux, Mac OS X, Windows, web
> hosting, etc by others. It is not impossible to have twisted as a
> dependency, but that makes deployment a larger job than simply uploading
> a Python file.

If it can be used by non-Python users, you will have to package it using 
py2exe or py2app anyway, in which case Twisted will be bundled 
automatically and the size overhead won't be very large.




From mailinglists at riddergarn.dk  Fri Mar 12 11:49:04 2010
From: mailinglists at riddergarn.dk (John P.)
Date: Fri, 12 Mar 2010 16:49:04 +0000
Subject: Threading, Queue for a function so it only runs once at a time.
In-Reply-To: <20100312112204.5513eebb.darcy@druid.net>
References: <84d41f095f0958519ea44d749793efeb@incoming.servage.net>
	<6cc20cea1003120054jec2241atc2b85920a64d869c@mail.gmail.com>
	<ebc0d55d6164a9aa280244645f8c6543@incoming.servage.net>
	<20100312112204.5513eebb.darcy@druid.net>
Message-ID: <1a57cdb3bd2bdf55176e96369d25d1b7@incoming.servage.net>

On Fri, 12 Mar 2010 11:22:04 -0500, "D'Arcy J.M. Cain" <darcy at druid.net>
wrote:
> On Fri, 12 Mar 2010 15:56:12 +0000
> "John P." <mailinglists at riddergarn.dk> wrote:
>> Sorry but its not really an option for me with PostgreSQL. Thanks
anyway.
> 
> Why?  It's your best option.  Any other solutions that you can't use
> before people give you more suggestions?

Chill. I didn't ask for an alternative to my database, it could be writing
in a file as well. What I need is some kind of queue to my function so it
doesnt crack up running 20 times at the same time. I'm working on a remote
server which I share with some friends, meaning I can't install whatever I
want to. 
The problem seems to be that my threads are making MySQL queries at the
same time before it can fetch the data just requested. Also I said thanks
for his effort trying to help and kept a nice tone, shouldn't that be
enough? 

/John


From solipsis at pitrou.net  Fri Mar 12 11:57:37 2010
From: solipsis at pitrou.net (Antoine Pitrou)
Date: Fri, 12 Mar 2010 16:57:37 +0000 (UTC)
Subject: file seek is slow
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>
Message-ID: <hndrq1$po8$2@dough.gmane.org>

Le Tue, 09 Mar 2010 15:56:47 -0800, Metalone a ?crit?:
>     for i in xrange(1000000):
>        f1.seek(0)

This is quite a stupid benchmark to write, since repeatedly seeking to 0 
is a no-op. I haven't re-read the file object code recently, but chances 
are that the Python file object has its own bookkeeping which adds a bit 
of execution time.

But I would suggest measuring the performance of *actual* seeks to 
different file offsets, before handwaving about the supposed "slowness" 
of file seeks in Python.

Regards

Antoine.



From mailinglists at riddergarn.dk  Fri Mar 12 12:25:13 2010
From: mailinglists at riddergarn.dk (John P.)
Date: Fri, 12 Mar 2010 17:25:13 +0000
Subject: Threading, Queue for a function so it only runs once at a time.
In-Reply-To: <1a57cdb3bd2bdf55176e96369d25d1b7@incoming.servage.net>
References: <84d41f095f0958519ea44d749793efeb@incoming.servage.net>
	<6cc20cea1003120054jec2241atc2b85920a64d869c@mail.gmail.com>
	<ebc0d55d6164a9aa280244645f8c6543@incoming.servage.net>
	<20100312112204.5513eebb.darcy@druid.net>
	<1a57cdb3bd2bdf55176e96369d25d1b7@incoming.servage.net>
Message-ID: <7242f69346c1ddb6803a50449fe36973@incoming.servage.net>

On Fri, 12 Mar 2010 16:49:04 +0000, "John P." <mailinglists at riddergarn.dk>
wrote:
> On Fri, 12 Mar 2010 11:22:04 -0500, "D'Arcy J.M. Cain" <darcy at druid.net>
> wrote:
>> On Fri, 12 Mar 2010 15:56:12 +0000
>> "John P." <mailinglists at riddergarn.dk> wrote:
>>> Sorry but its not really an option for me with PostgreSQL. Thanks
> anyway.
>> 
>> Why?  It's your best option.  Any other solutions that you can't use
>> before people give you more suggestions?
> 
> Chill. I didn't ask for an alternative to my database, it could be
writing
> in a file as well. What I need is some kind of queue to my function so
it
> doesnt crack up running 20 times at the same time. I'm working on a
remote
> server which I share with some friends, meaning I can't install whatever
I
> want to. 
> The problem seems to be that my threads are making MySQL queries at the
> same time before it can fetch the data just requested. Also I said
thanks
> for his effort trying to help and kept a nice tone, shouldn't that be
> enough? 
> 
> /John

Don't worry guys, I found a solution. My problem was caused because I used
the same mysql connection for all the treads, now its working perfectly,
with mysql. 

/John.


From cmpython at gmail.com  Fri Mar 12 13:31:50 2010
From: cmpython at gmail.com (CM)
Date: Fri, 12 Mar 2010 10:31:50 -0800 (PST)
Subject: Need advice on starting a Python group
References: <hnb0d1$2el$1@reader1.panix.com>
Message-ID: <ba83f1cf-9b25-4104-990b-daa3604d80b4@c16g2000yqd.googlegroups.com>

On Mar 11, 9:57?am, gb345 <gb... at invalid.com> wrote:
> I'm hoping to get advice from anyone with prior experience setting
> up a Python group.
>
> A friend of mine and I have been trying to start a
> scientific-programming-oriented Python group in our school (of
> medecine and bio research), with not much success.
>
> The main problem is attendance. ?Even though a *ton* of people have
> told us that it's a great idea, that they're *very* interested,
> and have asked to be added to our mailing list, the attendance to
> our first few meeting has never been more than 5, including my
> friend and I. ?Last time just he and I showed up.
>
> The second problem is getting content. ?The format we'd envisioned
> for this group was centered around code review (though not limited
> to it). ?The idea was that at every meeting a different member
> would show some code. ?This could be for any of a number of reasons,
> such as, for example, 1) illustrate a cool module or technique; 2)
> present a scientific research problem and how they used Python to
> solve it, or get help solving it; 3) get general feedback (e.g. on
> code clarity, software usability, module architecture, etc.). ?But
> in principle just about anything is OK: e.g. a talk on favorite
> Python resources, or a comparison of Python with some other language,
> or an overview of Python gotchas would all be fair game.
>
> Also, we stressed that the talks were not expected to be polished:
> no need for PowerPoint slides, etc. ?Just project any old code onto
> the screen, and talk about it, or scribble stuff on the chalkboard.
>
> Still, we have a hard time finding volunteers.
>
> And even when we've had volunteers, hardly anyone shows up!

Do you advertise each time and describe what the topic will be for
that meeting and why the attendees should care?  That might make a
difference.  I.e., there's a big difference between:

a) The Thursday afternoon Python for scientific applications is
meeting, and I should remember that this week amidst all the other
stuff I have going on.

and

b) Wow, this Thursday there will be an hour workshop on how to create
publication quality graphs (somewhat) easily in Python using ready-
made tools...and there will be pizza!

Also, giving it a cool acronymic name doesn't hurt.  :D

Che


From ugocupcic at gmail.com  Fri Mar 12 13:56:00 2010
From: ugocupcic at gmail.com (Ugo Cupcic)
Date: Fri, 12 Mar 2010 18:56:00 +0000
Subject: question regarding wxSlider
Message-ID: <df20a30d1003121056t66be663ds127aba6b9e679675@mail.gmail.com>

Hi all,

I have a question regarding wxSlider. I'm developing a wxwidget python
interface for a robotic hand. The sliders send the target values to the
joints.

I'd like to display the current position of the joint on the slider. I
wanted to use wxSlider.SetTick(myposition) but I couldn't get SetTick to
display anything.

Anyone has an idea ? I attached a dummy code to the message to illustrate.

Cheers,

Ugo

-- 
              Ugo Cupcic
http://www.genugo.com/ugocupcic
   _
  ' v '
/      \
 m m
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From agoretoy at gmail.com  Fri Mar 12 13:57:47 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Fri, 12 Mar 2010 12:57:47 -0600
Subject: execute bash builtins in python
In-Reply-To: <hnder4$bvg$1@dough.gmane.org>
References: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com> 
	<hnder4$bvg$1@dough.gmane.org>
Message-ID: <c9d33c541003121057l703689cxf886c4bdbdec4742@mail.gmail.com>

Steve thank you. The problem is that you can only run commands from Popen or
os.system and stuff. You cant run bash shell builtin commands for some
reason.

I was able to get this to work. What I did is call this:

Popen(["bash -c 'source
$HOME/.bashrc;alias'"],shell=True,stdout=PIPE).stdout.read()

and make sure you don't have a line like this in your .bashrc:
[ -z "$PS1" ] && return

Another approach I came up with was to set aliases and functions as a
environment variable and access them with os.environ.

this is how I'm doing it.

export ALIASES=`alias|awk '{print $2}'|cut -d = -f 1|xargs`
export FUNCTIONS=`declare -F|awk '{print $3}'|xargs`

use this at the end or the .bashrc and then you can access defined aliases
and functions inside python with environ

-Alex Goretoy
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From philip at semanchuk.com  Fri Mar 12 14:08:19 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Fri, 12 Mar 2010 14:08:19 -0500
Subject: question regarding wxSlider
In-Reply-To: <df20a30d1003121056t66be663ds127aba6b9e679675@mail.gmail.com>
References: <df20a30d1003121056t66be663ds127aba6b9e679675@mail.gmail.com>
Message-ID: <8EA74011-1EA0-42CB-BAF5-F9A9F1FF2D16@semanchuk.com>

On Mar 12, 2010, at 1:56 PM, Ugo Cupcic wrote:

> Hi all,
>
> I have a question regarding wxSlider. I'm developing a wxwidget python
> interface for a robotic hand. The sliders send the target values to  
> the
> joints.
>
> I'd like to display the current position of the joint on the slider. I
> wanted to use wxSlider.SetTick(myposition) but I couldn't get  
> SetTick to
> display anything.
>
> Anyone has an idea ? I attached a dummy code to the message to  
> illustrate.


Hi Ugo,
I don't mean to chase you away, but there is a dedicated wxPython  
mailing list where you obviously have a much better chance of getting  
an answer.

http://www.wxpython.org/maillist.php

Developing a robotic hand sounds like fun!

Cheers
Philip






From kwmsmith at gmail.com  Fri Mar 12 14:16:14 2010
From: kwmsmith at gmail.com (Kurt Smith)
Date: Fri, 12 Mar 2010 13:16:14 -0600
Subject: Need advice on starting a Python group
In-Reply-To: <hnb0d1$2el$1@reader1.panix.com>
References: <hnb0d1$2el$1@reader1.panix.com>
Message-ID: <c266a7931003121116p29f7bdc1h30b7db4adb419a31@mail.gmail.com>

On Thu, Mar 11, 2010 at 8:57 AM, gb345 <gb345 at invalid.com> wrote:
>
>
>
> I'm hoping to get advice from anyone with prior experience setting
> up a Python group.
>
> A friend of mine and I have been trying to start a
> scientific-programming-oriented Python group in our school (of
> medecine and bio research), with not much success.
>
> The main problem is attendance. ?Even though a *ton* of people have
> told us that it's a great idea, that they're *very* interested,
> and have asked to be added to our mailing list, the attendance to
> our first few meeting has never been more than 5, including my
> friend and I. ?Last time just he and I showed up.
>
> The second problem is getting content. ?The format we'd envisioned
> for this group was centered around code review (though not limited
> to it). ?The idea was that at every meeting a different member
> would show some code. ?This could be for any of a number of reasons,
> such as, for example, 1) illustrate a cool module or technique; 2)
> present a scientific research problem and how they used Python to
> solve it, or get help solving it; 3) get general feedback (e.g. on
> code clarity, software usability, module architecture, etc.). ?But
> in principle just about anything is OK: e.g. a talk on favorite
> Python resources, or a comparison of Python with some other language,
> or an overview of Python gotchas would all be fair game.
>
> Also, we stressed that the talks were not expected to be polished:
> no need for PowerPoint slides, etc. ?Just project any old code onto
> the screen, and talk about it, or scribble stuff on the chalkboard.
>
> Still, we have a hard time finding volunteers.
>
> And even when we've had volunteers, hardly anyone shows up!
>
> Any suggestions would be appreciated.
>
> GB
>
> P.S. ?There's a Python Meetup we could go to, but it does not fit
> the bill for us: it doesn't meet often enough, it's sort of out of
> the way, and has practically no one doing scientific programming.
> --
> http://mail.python.org/mailman/listinfo/python-list
>

There's a general Scientific Computing interest group that gets
together here at the University of Wisconsin-Madison, and it has a
significant Python component & focus.  They put on a Python bootcamp
this January that was a huge success.

http://hackerwithin.org/cgi-bin/hackerwithin.fcgi/wiki

They have bi-weekly meetings, sometimes it's of the 'come and share on
X topic,' although many times its 'local guest speaker is coming to
speak about Y'.  My impression is that the latter meetings grabbed a
number of people around campus -- 'hey, I need to do Y, I'll see what
the speaker has to say,' and then they started coming for the
show-and-tell meetings.  My recommendation would be to provide
something of value every meeting, the more specific the better.
'Python' in this regard is a bit open ended.  You'd likely get more
involvement if you had meetings that focused on, e.g., parallel
computing (and have examples in python (mpi4py), and have someone come
and talk about MPI or something), or scientific data formats (with
examples of pyhdf5 or pytables...), or you could advertise a tutorial
on some scipy & numpy features and their advantages over using
matlab/octave/idl.

It's more work than show-and-tell meetings, but look at it as priming the pump.

There is much interest around here re: Python in science, but many
have only heard about it, some have dabbled but put it on the shelf,
others couldn't get it to work (they're scientists and used to
prepackaged software that works out of the box -- if it doesn't, it's
somebody else's problem), many others can't justify the time it would
take to learn it when they already have something else working.  Until
something with value comes along (like your meeting with specific
topics) to change their minds, an open-ended meeting won't appeal much
to them.

Just some thoughts, and an example of what's worked here.  Personally
I tend to make it to the meetings with a specific topic, and end up
skipping the ones that are more open-ended.

Kurt


From gdamjan at gmail.com  Fri Mar 12 14:20:48 2010
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Fri, 12 Mar 2010 20:20:48 +0100
Subject: Python for newbies (Pythno users group in Macedonia)
Message-ID: <hpgq67-gai.ln1@archaeopteryx.softver.org.mk>

Hi all,
we are starting with bi-monthly Python User Group meetings in Skopje, 
Macedonia. The meetings are targeted for both beginners and more 
experienced users.

The basic idea is to have an 1 hour presentation at the start for the 
beginners and an 1 hour ad-hoc discussion about projects, applications, 
interesting stuff etc.

I'd like to gather some guidance/experince/thoughts about some beginner 
oriented python lectures we could use?

My first idea was to do something like the "Python module of the Week", 
but maybe there's a better approach?

thanks

-- 
damjan


From no.email at nospam.invalid  Fri Mar 12 14:23:10 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Fri, 12 Mar 2010 11:23:10 -0800
Subject: NoSQL Movement?
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<mailman.256.1267655008.23598.python-list@python.org>
	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
	<6cc20cea1003120105j626cc519o2271106e088b2e90@mail.gmail.com>
	<mailman.664.1268404115.23598.python-list@python.org>
Message-ID: <7xljdx73a9.fsf@ruckus.brouhaha.com>

"D'Arcy J.M. Cain" <darcy at druid.net> writes:
> Just curious, what database were you using that wouldn't keep up with
> you?  I use PostgreSQL and would never consider going back to flat
> files.  

Try making a file with a billion or so names and addresses, then
compare the speed of inserting that many rows into a postgres table
against the speed of copying the file.

> The only thing I can think of that might make flat files faster is
> that flat files are buffered whereas PG guarantees that your
> information is written to disk before returning 

Don't forget all the shadow page operations and the index operations,
and that a lot of these operations require reading as well as writing
remote parts of the disk, so buffering doesn't help avoid every disk
seek.

Generally when faced with this sort of problem I find it worthwhile to
ask myself whether the mainframe programmers of the 1960's-70's had to
deal with the same thing, e.g. when sending out millions of phone bills,
or processing credit card transactions (TPF), then ask myself how they
did it.  Their computers had very little memory or disk space by today's
standards, so their main bulk storage medium was mag tape.  A heck of a
lot of these data processing problems can be recast in terms of sorting
large files on tape, rather than updating database one record at a time
on disk or in memory.  And that is still what (e.g.) large search
clusters spend a lot of their time doing (look up the term "pennysort"
for more info).


From martin at v.loewis.de  Fri Mar 12 14:29:40 2010
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Fri, 12 Mar 2010 20:29:40 +0100
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
In-Reply-To: <4B9A614C.1080105@chamonix.reportlab.co.uk>
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>	<mailman.619.1268324988.23598.python-list@python.org>	<4B992FB5.8090207@v.loewis.de>
	<4B9A2810.9030602@chamonix.reportlab.co.uk>
	<4B9A614C.1080105@chamonix.reportlab.co.uk>
Message-ID: <4B9A9624.7040200@v.loewis.de>

> Not sure if this is a bug

I think it is. It seems that the cross-build support in msvc9compiler
has been tested only in a build tree of Python (where there is no Libs
directory).

For released copies of Python, I could change that to distribute the
AMD64 pythonXY.lib in libs/amd64. [FWIW, I'm still puzzled why I ship
the import libraries of all the pyd files as well - I can't see a reason
other than tradition]. Then, distutils should change to look it up there.

Regards,
Martin


From jcb at iteris.com  Fri Mar 12 14:53:28 2010
From: jcb at iteris.com (Metalone)
Date: Fri, 12 Mar 2010 11:53:28 -0800 (PST)
Subject: file seek is slow
References: <d2d66b7b-2bf6-4c4f-8e23-ed89b72d9b99@s25g2000prd.googlegroups.com>
	<mailman.680.1268413073.23598.python-list@python.org>
Message-ID: <d9f78dc8-d51b-4e1b-a89c-1f170f3b9718@z1g2000prc.googlegroups.com>

I almost wrote a long reply to all this.
In the end it boils down to being concerned about how much overhead
there is to calling a 'C' function.
I assumed that file.seek() simply delegated to fseek() and thus was
one way to test this overhead.
However, I now think that it must be doing more and may not be a
reasonable comparison.

I have used the profiler about as much as I can to find where my
program is slow, and it appears to me that
the overhead to calling 'C' functions is now my biggest problem.
I have been using Ctypes, which has been a great tool so far.
I just discovered Cython and this looks like it may help me.
I had not heard of pythoid, so I will check it out.

I did not mean to offend anybody in Cython community.
It just seemed funny to me that 21 lines of Python became 1478 lines
of 'C'.
I wasn't really expecting any response to this.
I don't know enough about this to really assume anything.

Stephan,
I just tested 1e7 loops.
'C': 8.133 seconds
Cython: 10.812 seconds

I can't figure out what Cython is using for CFLAGS, so this could be
important.

I used While instead of xrange, because I thought it would be faster
in Cython.
They had roughly the same execution speed.

Thanks all for the suggestions.
I think I will just consider this thread closed.




From john at castleamber.com  Fri Mar 12 15:36:35 2010
From: john at castleamber.com (John Bokma)
Date: Fri, 12 Mar 2010 14:36:35 -0600
Subject: Anything like "Effective Java" for Python?
References: <hn8d98$m0d$1@reader1.panix.com>
	<mailman.672.1268409423.23598.python-list@python.org>
Message-ID: <87k4thp99o.fsf@castleamber.com>

Gabriel Rossetti <gabriel.rossetti at arimaz.com> writes:

> kj wrote:
>>
>> Subject line pretty much says it all: is there a book like "Effective
>> Java" for Python.  I.e. a book that assumes that readers are
>> experienced programmers that already know the basics of the language,
>> and want to focus on more advanced programming issues?
>
> Effective Java is a good book, it is not like most people responding
> to this topic a "how to program in Java"

I had more the feeling that these responses were more of the "Look, you
actually need a book to learn how to program effectively in Java
*snigger*" fanboism.

> book but a "I know how to program in Python, but I want it to run fast
> and use a minimal amount of memory".
> I would have liked to have such a book for Python when I was past the
> language learning stage.

High Performance Python by Anthony Lewis (Author), et al. (*snigger*!)

might be such a book but we have to wait a few more months:
Publisher: O'Reilly Media; 1 edition (September 15, 2010)
(It has been on my wish list for several months)

To the OP: right now, Dive into Python is clearly written with people
who have experience with programming in mind. I've both the Python 2 and
Python 3 version (books). You can download a version of each for free:

http://www.google.com/search?q=dive%20into%20python

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From martin at v.loewis.de  Fri Mar 12 15:56:42 2010
From: martin at v.loewis.de (Martin v. Loewis)
Date: Fri, 12 Mar 2010 21:56:42 +0100
Subject: Unicode characters in btye-strings
In-Reply-To: <mailman.667.1268408282.23598.python-list@python.org>
References: <4b9a352d$0$27822$c3e8da3@news.astraweb.com>
	<mailman.667.1268408282.23598.python-list@python.org>
Message-ID: <hne9qa$ehf$1@online.de>

>> Can somebody explain what happens when I put non-ASCII characters into a
>> non-unicode string? My guess is that the result will depend on the
>> current encoding of my terminal.
> 
> Exactly right.

To elaborate on the "what happens" part: the string that gets entered is
typically passed as a byte sequence, from the terminal (application) to
the OS kernel, from the OS kernel to Python's stdin, and from there to
the parser. Python recognizes the string delimiters, but (practically)
leaves the bytes between the delimiters as-is (*), creating a byte
string object with the very same bytes.

The more interesting question is what happens when you do

py> s = u"???"

Here, Python needs to decode the bytes, according to some encoding.
Usually, it would want to use the source encoding (as given through
-*- Emacs -*- markers), but there are none. Various Python versions then
try different things; what they should do is to determine the terminal
encoding, and decode the bytes according to that one.

Regards,
Martin

(*) If a source encoding was given, the source is actually recoded to
UTF-8, parsed, and then re-encoded back into the original encoding.


From spamfresser at ch3ka.de  Fri Mar 12 17:55:49 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Fri, 12 Mar 2010 23:55:49 +0100
Subject: Unicode characters in btye-strings
In-Reply-To: <hne9qa$ehf$1@online.de>
References: <4b9a352d$0$27822$c3e8da3@news.astraweb.com>
	<mailman.667.1268408282.23598.python-list@python.org>
	<hne9qa$ehf$1@online.de>
Message-ID: <hnegpr$qam$1@news.urz.uni-heidelberg.de>

Am 12.03.2010 21:56, schrieb Martin v. Loewis:
> (*) If a source encoding was given, the source is actually recoded to
> UTF-8, parsed, and then re-encoded back into the original encoding.

Why is that? So "unicode"-strings (as in u"string") are not really 
unicode-, but utf8-strings?

Need citation plz.

Thx,
Michael


From torriem at gmail.com  Fri Mar 12 18:15:55 2010
From: torriem at gmail.com (Michael Torrie)
Date: Fri, 12 Mar 2010 16:15:55 -0700
Subject: converting datetime with tzinfo to unix timestamp
Message-ID: <4B9ACB2B.3090203@gmail.com>

On Python 2.5 here.

I've searched and searched but I can't find any way to convert a
datetime object that includes a timezone (tzinfo) to a unix timestamp.
Folks on the net say to simply use the timetuple() method of the object
and feed that to time.mktime().  But that just doesn't seem to work for
me.  At least if my understanding that the unix timestamp is always UTC.

I'm using the pytz module to create a datetime object of a certain
timezone.  For example:


import pytz
import datetime
import time

mountain = pytz.timezone("US/Mountain") # MST or MDT depending on date
eastern = pytz.timezone("US/Eastern")   # EST or EDT depending on date

date1 = mountain.localize(datetime.datetime(2010, 3, 12, 9, 0))
date2 = eastern.localize(datetime.datetime(2010, 3, 12, 9, 0))

Now if I examine the two objects, I get:
>>> print date1
2010-03-12 09:00:00-07:00

>>> print date2
2010-03-12 09:00:00-05:00

However the standard time.mktime(date2.timetuple()) thing gives me a
timestamp, but it's in my local timezone and gives me the same answer
for both dates!

Can anyone point me in the right direction?

thanks.


From mmanns at gmx.net  Fri Mar 12 18:24:49 2010
From: mmanns at gmx.net (Martin Manns)
Date: Sat, 13 Mar 2010 00:24:49 +0100
Subject: [ANN] Pyspread 0.0.14b released
Message-ID: <mailman.713.1268503217.23598.python-announce-list@python.org>

Pyspread 0.0.14b released
=========================

I am pleased to announce the new release 0.0.14b of pyspread.

 
About: 
------

Pyspread is a cross-platform Python spreadsheet application. 
It is based on and written in the programming language Python.

Instead of spreadsheet formulas, Python expressions are entered into
the spreadsheet cells. Each expression returns a Python object that can
be accessed from other cells. These objects can represent anything
including lists or matrices.

Pyspread runs on Linux and *nix platforms with GTK support as well as
on Windows (XP and Vista tested). On Mac OS X, some icons are too small
but the application basically works.


Homepage
--------

http://pyspread.sourceforge.net


New features
------------

 * Cell border can be changed independently.
 * Cell access allows negative indices when not slicing.


Enjoy

Martin



From john at castleamber.com  Fri Mar 12 18:37:54 2010
From: john at castleamber.com (John Bokma)
Date: Fri, 12 Mar 2010 17:37:54 -0600
Subject: Unicode characters in btye-strings
References: <4b9a352d$0$27822$c3e8da3@news.astraweb.com>
	<mailman.667.1268408282.23598.python-list@python.org>
	<hne9qa$ehf$1@online.de> <hnegpr$qam$1@news.urz.uni-heidelberg.de>
Message-ID: <87r5npnmb1.fsf@castleamber.com>

Michael Rudolf <spamfresser at ch3ka.de> writes:

> Am 12.03.2010 21:56, schrieb Martin v. Loewis:
>> (*) If a source encoding was given, the source is actually recoded to
>> UTF-8, parsed, and then re-encoded back into the original encoding.
>
> Why is that? So "unicode"-strings (as in u"string") are not really
> unicode-, but utf8-strings?

utf8 is a Unicode *encoding*.

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From martin at v.loewis.de  Fri Mar 12 18:51:42 2010
From: martin at v.loewis.de (Martin v. Loewis)
Date: Sat, 13 Mar 2010 00:51:42 +0100
Subject: Unicode characters in btye-strings
In-Reply-To: <hnegpr$qam$1@news.urz.uni-heidelberg.de>
References: <4b9a352d$0$27822$c3e8da3@news.astraweb.com>
	<mailman.667.1268408282.23598.python-list@python.org>
	<hne9qa$ehf$1@online.de> <hnegpr$qam$1@news.urz.uni-heidelberg.de>
Message-ID: <4B9AD38E.5030402@v.loewis.de>

Michael Rudolf wrote:
> Am 12.03.2010 21:56, schrieb Martin v. Loewis:
>> (*) If a source encoding was given, the source is actually recoded to
>> UTF-8, parsed, and then re-encoded back into the original encoding.
> 
> Why is that?

Why is what? That string literals get reencoded into the source encoding?

> So "unicode"-strings (as in u"string") are not really 
> unicode-, but utf8-strings?

No. String literals, in 2.x, are not written with u"", and are stored in
the source encoding. Above procedure applies to regular strings (see
where the "*" goes in my original article).

> Need citation plz.

You really want a link to the source code implementing that?

Regards,
Martin


From morecrown at gmail.com  Fri Mar 12 19:29:33 2010
From: morecrown at gmail.com (Hephzibah)
Date: Fri, 12 Mar 2010 16:29:33 -0800 (PST)
Subject: POS Tagging
Message-ID: <1610f59e-b49f-4c5b-ade7-915c92c32b79@q21g2000yqm.googlegroups.com>

I just started working on POS tagging with these codes:

import nltk
text = nltk.word_tokenize("And now for something completely
different")
#print text
print nltk.pos_tag(text)

Python prompted me to download a resource with these codes:

Resource 'taggers/maxent_treebank_pos_tagger/english.pickle' not
found.  Please use the NLTK Downloader to obtain the resource:

I download the resources available using nltk.download(). But  I
couldn't run POS tagger. Python gave my the following message:

Traceback (most recent call last):
  File "C:/Python25/tag practices.py", line 5, in <module>
    print nltk.pos_tag(text)
  File "C:\Python25\lib\site-packages\nltk\tag\__init__.py", line 62,
in pos_tag
    tagger = nltk.data.load(_POS_TAGGER)
  File "C:\Python25\lib\site-packages\nltk\data.py", line 492, in load
    resource_val = pickle.load(_open(resource_url))
  File "C:\Python25\lib\site-packages\nltk\classify\maxent.py", line
57, in <module>
    import numpy
ImportError: No module named numpy

Can someone pls. tell me what I'm supposed to do next?

Thanks,
Hephzibah


From john at castleamber.com  Fri Mar 12 19:33:55 2010
From: john at castleamber.com (John Bokma)
Date: Fri, 12 Mar 2010 18:33:55 -0600
Subject: POS Tagging
References: <1610f59e-b49f-4c5b-ade7-915c92c32b79@q21g2000yqm.googlegroups.com>
Message-ID: <87aaudnjpo.fsf@castleamber.com>

Hephzibah <morecrown at gmail.com> writes:

> ImportError: No module named numpy
>
> Can someone pls. tell me what I'm supposed to do next?

Install numpy would be my first guess.

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From alex.kapps at web.de  Fri Mar 12 19:44:49 2010
From: alex.kapps at web.de (Alexander Kapps)
Date: Sat, 13 Mar 2010 01:44:49 +0100
Subject: Python eCommerce, small webshop
Message-ID: <4B9AE001.3050406@web.de>

Hello everybody!

I have to set up a small webshop for used books, CDs, DVD, and stuff 
  and did't find anything realy usefull on google.

I'm pretty skilled with Python and would strongly prefer a Python 
based Shop but all I've found are in early stage, unmaintained or 
too limited.

I've looked around and found many PHP based shops (currently I'm 
playing with OpenCart but their code is so messy, I don't think this 
is going to work) and some Ruby based ones (I don't know Ruby at all)

I there really no decent, up-to-date, activily maintained and post 
beta stage Python webshop?

What I need is:

- full german support (ie. translation, shipping models, payment 
models, etc)
- secure (code, SQL, full SSL, etc)
- themable without getting into all gory details of modern HTML/CSS 
(a bit is OK)
- customizable by people with good Python and basic SQL knowledge
- finally (after being setup) usable by people without any 
programming skills at all.



Thanks for any tips.

Regards
Alex


From alex.kapps at web.de  Fri Mar 12 20:02:36 2010
From: alex.kapps at web.de (Alexander Kapps)
Date: Sat, 13 Mar 2010 02:02:36 +0100
Subject: Python eCommerce, small webshop
Message-ID: <4B9AE42C.1060905@web.de>

Hello everybody!

I have to set up a small webshop for used books, CDs, DVD, and stuff 
  and did't find anything realy usefull on google.

I'm pretty skilled with Python and would strongly prefer a Python 
based Shop but all I've found are in early stage, unmaintained or 
too limited.

I've looked around and found many PHP based shops (currently I'm 
playing with OpenCart but their code is so messy, I don't think this 
is going to work) and some Ruby based ones (I don't know Ruby at all)

I there really no decent, up-to-date, activily maintained and post 
beta stage Python webshop?

What I need is:

- full german support (ie. translation, shipping models, payment 
models, etc)
- secure (code, SQL, full SSL, etc)
- themable without getting into all gory details of modern HTML/CSS 
(a bit is OK)
- customizable by people with good Python and basic SQL knowledge
- finally (after being setup) usable by people without any 
programming skills at all.



Thanks for any tips.

Regards
Alex


From emile at fenx.com  Fri Mar 12 20:11:04 2010
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 12 Mar 2010 17:11:04 -0800
Subject: Python eCommerce, small webshop
In-Reply-To: <4B9AE42C.1060905@web.de>
References: <4B9AE42C.1060905@web.de>
Message-ID: <hneojs$d4l$1@dough.gmane.org>

On 3/12/2010 5:02 PM Alexander Kapps said...
> Hello everybody!
>
> I have to set up a small webshop for used books, CDs, DVD, and stuff and
> did't find anything realy usefull on google.

Have you checked the current status of Satchmo?

Emile


>
> I'm pretty skilled with Python and would strongly prefer a Python based
> Shop but all I've found are in early stage, unmaintained or too limited.
>
> I've looked around and found many PHP based shops (currently I'm playing
> with OpenCart but their code is so messy, I don't think this is going to
> work) and some Ruby based ones (I don't know Ruby at all)
>
> I there really no decent, up-to-date, activily maintained and post beta
> stage Python webshop?
>
> What I need is:
>
> - full german support (ie. translation, shipping models, payment models,
> etc)
> - secure (code, SQL, full SSL, etc)
> - themable without getting into all gory details of modern HTML/CSS (a
> bit is OK)
> - customizable by people with good Python and basic SQL knowledge
> - finally (after being setup) usable by people without any programming
> skills at all.
>
>
>
> Thanks for any tips.
>
> Regards
> Alex




From alex.kapps at web.de  Fri Mar 12 20:38:55 2010
From: alex.kapps at web.de (Alexander Kapps)
Date: Sat, 13 Mar 2010 02:38:55 +0100
Subject: Python eCommerce, small webshop
In-Reply-To: <4B9AEB04.3010403@web.de>
References: <4B9AE42C.1060905@web.de> <hneojs$d4l$1@dough.gmane.org>
	<4B9AEB04.3010403@web.de>
Message-ID: <4B9AECAF.10709@web.de>

Sorry, Emile for the private post, one beer too much and the wrong 
button... ;-)

Emile van Sebille wrote:

 > On 3/12/2010 5:02 PM Alexander Kapps said...
 >> Hello everybody!
 >>
 >> I have to set up a small webshop for used books, CDs, DVD, and 
stuff and
 >> did't find anything realy usefull on google.
 >
 > Have you checked the current status of Satchmo?

Sort of. I checked their site and feature list which looks 
promising. Then I searched for a forum. I have quite some objections 
  against projects who only have a google group with a reaction time 
measured in days.

But since you mentioned it, I'll have a closer look.

Thank you.


From steve at REMOVE-THIS-cybersource.com.au  Fri Mar 12 22:06:52 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 13 Mar 2010 03:06:52 GMT
Subject: StringChain -- a data structure for managing large sequences of 
	chunks of bytes
References: <mailman.646.1268377905.23598.python-list@python.org>
	<4b9a00ce$0$27822$c3e8da3@news.astraweb.com>
	<mailman.661.1268401226.23598.python-list@python.org>
Message-ID: <4b9b014c$0$27822$c3e8da3@news.astraweb.com>

On Fri, 12 Mar 2010 13:40:23 +0000, MRAB wrote:

>> To be taken seriously, I think you need to compare stringchain to the
>> list idiom. If your benchmarks favourably compare to that, then it
>> might be worthwhile.
>> 
> IIRC, someone did some work on making concatenation faster by delaying
> it until a certain threshold had been reached (in the string class
> implementation).

I believe you're talking about this patch:

http://bugs.python.org/issue1569040

It's never been formally rejected, but the chances of it being accepted 
are pretty low.


However, in Python 2.4 another optimization was added that makes string 
concatenation of the form:

a = a + b
a += b

much faster. This is implementation specific (Jython and IronPython don't 
have it, and almost certainly won't) and it doesn't work for (e.g.):

a = b + a

See here: 

http://mail.python.org/pipermail/python-dev/2004-August/046686.html
http://bugs.python.org/issue980695



-- 
Steven


From robin1 at cnsp.com  Fri Mar 12 22:26:20 2010
From: robin1 at cnsp.com (Robin)
Date: Fri, 12 Mar 2010 19:26:20 -0800 (PST)
Subject: python to exe
Message-ID: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>

Does anyone know of a good python to stand alone exe compiler?

Thanks,
-Robin


From gagsl-py2 at yahoo.com.ar  Fri Mar 12 23:11:47 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 12 Mar 2010 20:11:47 -0800 (PST)
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
Message-ID: <b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>

On 13 mar, 00:26, Robin <rob... at cnsp.com> wrote:

> Does anyone know of a good python to stand alone exe compiler?

http://tinyurl.com/yfcfzz4



From clp2 at rebertia.com  Fri Mar 12 23:12:19 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 12 Mar 2010 20:12:19 -0800
Subject: python to exe
In-Reply-To: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
Message-ID: <50697b2c1003122012q3c2530bt79666118bc639b87@mail.gmail.com>

On Fri, Mar 12, 2010 at 7:26 PM, Robin <robin1 at cnsp.com> wrote:
> Does anyone know of a good python to stand alone exe compiler?

py2exe:
http://www.py2exe.org/

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


From dr.cg at 126.com  Fri Mar 12 23:13:42 2010
From: dr.cg at 126.com (CHEN Guang)
Date: Sat, 13 Mar 2010 12:13:42 +0800 (CST)
Subject: file seek is slow
Message-ID: <3c99dc54.26bd.12755ba44ca.Coremail.dr.cg@126.com>

>> Metalone wrote:
>>> I just tried the seek test with Cython.
>>> Cython fseek() : 1.059 seconds.  30% slower than 'C'
>>> Python f.seek  : 1.458 secondds. 80% slower than 'C'.
>>>
>>> It is amazing to me that Cython generates a 'C' file that is 1478
>>> lines.
>>
>> PythoidC ( http://pythoidc.googlecode.com ) generates the shortest 'C' file.
>> PythoidC is the C language like the Python, by the Python and for the Python.

>Except that it's not a language but rather a syntax converter, i.e. it 
>doesn't really add any features to the C language but rather restricts 
>Python syntax to C language features (plus a bit of header file 
>introspection, it seems, but C's preprocessor has a bit of that, too).
>Stefan

PythoidC is a familar language to Python and C programmers, I do not like
waste my time to create unfamilar things to waste users' time studying. 
In fact PythoidC removed some boring features from C language:
1. no semicolon ; at line ends
2. no braces {} , take Pythonic indent region to express code block
PythoidC restricts C syntax to Python language feature, so that 
C language bacomes friendly to Python programmers and Python IDE. 
PythoidC realized introspection not only on header files but also any C files.
The PythoidC introspection will be as good as Python introspection, 
if only the C header file wirters adds more detailed annotation. 
PythoidC is a familar and convenient C language tool for Python programmers and mixed programming.
plus, PythoidC is realizable only with Python, it's too far beyond C's preprocessor, believe it, or show us. 
CHEN Guang
Convenient C Python mixed programming --- PythoidC ( http://pythoidc.googlecode.com )
 
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From john at castleamber.com  Fri Mar 12 23:26:34 2010
From: john at castleamber.com (John Bokma)
Date: Fri, 12 Mar 2010 22:26:34 -0600
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
Message-ID: <87bpes6e4l.fsf@castleamber.com>

Gabriel Genellina <gagsl-py2 at yahoo.com.ar> writes:

> On 13 mar, 00:26, Robin <rob... at cnsp.com> wrote:
>
>> Does anyone know of a good python to stand alone exe compiler?
>
> http://tinyurl.com/yfcfzz4

Wow, pathetic fuck. You don't have to post you know.

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From morecrown at gmail.com  Fri Mar 12 23:36:46 2010
From: morecrown at gmail.com (Hephzibah)
Date: Fri, 12 Mar 2010 20:36:46 -0800 (PST)
Subject: POS Tagging
References: <1610f59e-b49f-4c5b-ade7-915c92c32b79@q21g2000yqm.googlegroups.com>
	<87aaudnjpo.fsf@castleamber.com>
Message-ID: <14b223b6-10c2-4ee3-9d18-18677a6769c9@d27g2000yqf.googlegroups.com>

On Mar 12, 4:33?pm, John Bokma <j... at castleamber.com> wrote:
> Hephzibah <morecr... at gmail.com> writes:
> > ImportError: No module named numpy
>
> > Can someone pls. tell me what I'm supposed to do next?
>
> Install numpy would be my first guess.
>
> --
> John Bokma ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? j3b
>
> Hacking & Hiking in Mexico - ?http://johnbokma.com/http://castleamber.com/- Perl & Python Development

Thanks so much

I've been able to resolve the issue.
What  I did was to run the program after downloading and installing
i. a newer version of Python -version 26
ii. pyPAML
iii.numpy
iv.matplotlib; all from www.nltk.org.

regards,
Hephzibah



From clp2 at rebertia.com  Fri Mar 12 23:47:31 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 12 Mar 2010 20:47:31 -0800
Subject: python to exe
In-Reply-To: <4B9B17B3.8000307@cnsp.com>
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<50697b2c1003122012q3c2530bt79666118bc639b87@mail.gmail.com>
	<4B9B17B3.8000307@cnsp.com>
Message-ID: <50697b2c1003122047l5b8fa440lc6f1389b58d02df@mail.gmail.com>

On Fri, Mar 12, 2010 at 8:42 PM, robin <robin1 at cnsp.com> wrote:
> On 3/12/2010 9:12 PM, Chris Rebert wrote:
>> On Fri, Mar 12, 2010 at 7:26 PM, Robin<robin1 at cnsp.com> ?wrote:
>>> Does anyone know of a good python to stand alone exe compiler?
>>>
>> py2exe:
>> http://www.py2exe.org/
>
> do you ?of an alternate compilter it doesn't work (py2exe) on my windows 7
> box, I hate windows7 THanks Robin

Nope; py2exe is pretty much the go-to tool for this.
Try asking on their mailinglist:
https://lists.sourceforge.net/lists/listinfo/py2exe-users

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


From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 13 01:47:47 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 13 Mar 2010 06:47:47 GMT
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
	<87bpes6e4l.fsf@castleamber.com>
Message-ID: <4b9b3513$0$27822$c3e8da3@news.astraweb.com>

On Fri, 12 Mar 2010 22:26:34 -0600, John Bokma wrote:

> Gabriel Genellina <gagsl-py2 at yahoo.com.ar> writes:
> 
>> On 13 mar, 00:26, Robin <rob... at cnsp.com> wrote:
>>
>>> Does anyone know of a good python to stand alone exe compiler?
>>
>> http://tinyurl.com/yfcfzz4
> 
> Wow, pathetic fuck. You don't have to post you know.

Gabriel is one of the more helpful and newbie-friendly of the frequent 
posters on this newsgroup. Even if his actions were worthy of your abuse 
(and they aren't), he gets at least one Get Out Of Jail Free card for his 
long-term helpfulness.

Speaking as somebody who finds Let Me Google That For You to be tiresome 
and not at all amusing, nevertheless I support Gabriel's actions. By 
merely giving Robin the answer, Robin doesn't learn how to find out the 
answer to simple questions himself, and by rewarding his laziness, we 
make a rod for our own back.

As the old proverb goes: give a man a fish, and you feed him for a day. 
Teach him how to fish, and he has food forever.

I'm an old-fashioned kind of guy, and don't like LMGTFY because it is 
tiresome and requires Javascript. I prefer:

Google is your friend:

http://www.google.com/search?q=python+standalone+exe

Oh, and Robin, since you have apparently already tried py2exe and found 
it doesn't work on Windows 7, you should have said so from the start, 
instead of wasting everyone's time.



-- 
Steven


From ugocupcic at gmail.com  Sat Mar 13 03:04:31 2010
From: ugocupcic at gmail.com (Ugo Cupcic)
Date: Sat, 13 Mar 2010 08:04:31 +0000
Subject: question regarding wxSlider
In-Reply-To: <8EA74011-1EA0-42CB-BAF5-F9A9F1FF2D16@semanchuk.com>
References: <df20a30d1003121056t66be663ds127aba6b9e679675@mail.gmail.com> 
	<8EA74011-1EA0-42CB-BAF5-F9A9F1FF2D16@semanchuk.com>
Message-ID: <df20a30d1003130004u6386d0bbp41bfedb356f88a90@mail.gmail.com>

Hi Philip,

Thanks for your redirection. I'll try with them :)

Cheers,

Ugo

PS : yes developing  a robotic hand is really fun :D

On Fri, Mar 12, 2010 at 7:08 PM, Philip Semanchuk <philip at semanchuk.com>wrote:

> On Mar 12, 2010, at 1:56 PM, Ugo Cupcic wrote:
>
>  Hi all,
>>
>> I have a question regarding wxSlider. I'm developing a wxwidget python
>> interface for a robotic hand. The sliders send the target values to the
>> joints.
>>
>> I'd like to display the current position of the joint on the slider. I
>> wanted to use wxSlider.SetTick(myposition) but I couldn't get SetTick to
>> display anything.
>>
>> Anyone has an idea ? I attached a dummy code to the message to illustrate.
>>
>
>
> Hi Ugo,
> I don't mean to chase you away, but there is a dedicated wxPython mailing
> list where you obviously have a much better chance of getting an answer.
>
> http://www.wxpython.org/maillist.php
>
> Developing a robotic hand sounds like fun!
>
> Cheers
> Philip
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
              Ugo Cupcic
http://www.genugo.com/ugocupcic
   _
  ' v '
/      \
 m m
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From agoretoy at gmail.com  Sat Mar 13 03:42:36 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Sat, 13 Mar 2010 02:42:36 -0600
Subject: execute bash builtins in python
In-Reply-To: <c9d33c541003121057l703689cxf886c4bdbdec4742@mail.gmail.com>
References: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com> 
	<hnder4$bvg$1@dough.gmane.org>
	<c9d33c541003121057l703689cxf886c4bdbdec4742@mail.gmail.com>
Message-ID: <c9d33c541003130042j75044335x841ea7ce4d21c312@mail.gmail.com>

I found this to be even better; maybe someone will find this useful, who
knows.
just export PS1, duh
Popen(["bash -c 'export PS1='python'; source
$HOME/.bashrc;alias'"],shell=True,stdout=PIPE).stdout.read()

-Alex Goretoy
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From g.bogle at auckland.no.spam.ac.nz  Sat Mar 13 04:38:29 2010
From: g.bogle at auckland.no.spam.ac.nz (Gib Bogle)
Date: Sat, 13 Mar 2010 22:38:29 +1300
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
Message-ID: <hnfmek$o5a$1@speranza.aioe.org>

Steven D'Aprano wrote:

> As the old proverb goes: give a man a fish, and you feed him for a day. 
> Teach him how to fish, and he has food forever.

I like this version:

Light a man a fire, and you keep him warm for hours.  Set a man on fire, and you 
keep him warm for the rest of his life.

;-)


From dr.cg at 126.com  Sat Mar 13 05:02:31 2010
From: dr.cg at 126.com (CHEN Guang)
Date: Sat, 13 Mar 2010 18:02:31 +0800 (CST)
Subject: python to exe
Message-ID: <1e3b567.3797.12756f99dda.Coremail.dr.cg@126.com>

>Does anyone know of a good python to stand alone exe compiler?

>Thanks,
>-Robin

I tried several such tools and found the easiest one: Pyinstaller ( http://www.pyinstaller.org/ )
but it does not make your script faster, if you want it as fast as C language, 
please try PythoidC ( http://pythoidc.googlecode.com )
 
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From alfps at start.no  Sat Mar 13 05:35:41 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Sat, 13 Mar 2010 11:35:41 +0100
Subject: python to exe
In-Reply-To: <hnfmek$o5a$1@speranza.aioe.org>
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
	<hnfmek$o5a$1@speranza.aioe.org>
Message-ID: <hnfppv$hpe$1@news.eternal-september.org>

* Gib Bogle:
> Steven D'Aprano wrote:
> 
>> As the old proverb goes: give a man a fish, and you feed him for a 
>> day. Teach him how to fish, and he has food forever.
> 
> I like this version:
> 
> Light a man a fire, and you keep him warm for hours.  Set a man on fire, 
> and you keep him warm for the rest of his life.
> 
> ;-)

Hey! I was going to post that! And there it was, in the next article... :-)

Cheers,

- Alf


From breamoreboy at yahoo.co.uk  Sat Mar 13 05:58:15 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Sat, 13 Mar 2010 10:58:15 +0000
Subject: python to exe
In-Reply-To: <hnfmek$o5a$1@speranza.aioe.org>
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>	<87bpes6e4l.fsf@castleamber.com>	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
	<hnfmek$o5a$1@speranza.aioe.org>
Message-ID: <hnfr2r$qk0$1@dough.gmane.org>

Gib Bogle wrote:
> Steven D'Aprano wrote:
> 
>> As the old proverb goes: give a man a fish, and you feed him for a 
>> day. Teach him how to fish, and he has food forever.
> 
> I like this version:
> 
> Light a man a fire, and you keep him warm for hours.  Set a man on fire, 
> and you keep him warm for the rest of his life.
> 
> ;-)

I'm certain that members of the Guinea Pig Club might have something to 
say on that one, see :-
http://en.wikipedia.org/wiki/Guinea_Pig_Club



From usenot at geekmail.INVALID  Sat Mar 13 06:41:38 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Sat, 13 Mar 2010 12:41:38 +0100
Subject: to create variable from dict
References: <4859ed52-7276-4617-b25e-902b52cfe7c5@s36g2000prh.googlegroups.com>
	<ecc59606-b4c2-418f-9cb2-27e9b2c47714@o30g2000yqb.googlegroups.com>
Message-ID: <20100313124138.6d981759@geekmail.INVALID>

On Fri, 12 Mar 2010 06:50:18 -0800 (PST) Luis M. Gonz?lez
<luismgz at gmail.com> wrote:

> The question is: should you do it?

And the answer is: No.

And the usual disclaimer is: (Unless you *know* it's the best possible
solution to your problem.)

/W

-- 
INVALID? DE!



From steve at holdenweb.com  Sat Mar 13 08:08:24 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 13 Mar 2010 08:08:24 -0500
Subject: execute bash builtins in python
In-Reply-To: <c9d33c541003130042j75044335x841ea7ce4d21c312@mail.gmail.com>
References: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com>
	<hnder4$bvg$1@dough.gmane.org>	<c9d33c541003121057l703689cxf886c4bdbdec4742@mail.gmail.com>
	<c9d33c541003130042j75044335x841ea7ce4d21c312@mail.gmail.com>
Message-ID: <hng2p6$gaa$1@dough.gmane.org>

alex goretoy wrote:
> I found this to be even better; maybe someone will find this useful, who
> knows.
> just export PS1, duh
> Popen(["bash -c 'export PS1='python'; source
> $HOME/.bashrc;alias'"],shell=True,stdout=PIPE).stdout.read()
> 
Try using an interactive shell:

>>> from subprocess import *
>>> p1 = Popen("bash -i -c alias", stdout=PIPE, shell=True)
>>> p1.stdout.read()
"alias ls='ls --color=auto'\n"
>>>

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Sat Mar 13 08:09:34 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 13 Mar 2010 08:09:34 -0500
Subject: python to exe
In-Reply-To: <87bpes6e4l.fsf@castleamber.com>
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
	<87bpes6e4l.fsf@castleamber.com>
Message-ID: <hng2rb$g8g$1@dough.gmane.org>

John Bokma wrote:
> Gabriel Genellina <gagsl-py2 at yahoo.com.ar> writes:
> 
>> On 13 mar, 00:26, Robin <rob... at cnsp.com> wrote:
>>
>>> Does anyone know of a good python to stand alone exe compiler?
>> http://tinyurl.com/...
> 
> Wow, pathetic fuck. You don't have to post you know.
> 
And you don't have to give Google a second chance at indexing the URL,
but we all make mistakes.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Sat Mar 13 08:11:07 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 13 Mar 2010 08:11:07 -0500
Subject: python to exe
In-Reply-To: <hnfmek$o5a$1@speranza.aioe.org>
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>	<87bpes6e4l.fsf@castleamber.com>	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
	<hnfmek$o5a$1@speranza.aioe.org>
Message-ID: <hng2u8$g8g$2@dough.gmane.org>

Gib Bogle wrote:
> Steven D'Aprano wrote:
> 
>> As the old proverb goes: give a man a fish, and you feed him for a
>> day. Teach him how to fish, and he has food forever.
> 
> I like this version:
> 
> Light a man a fire, and you keep him warm for hours.  Set a man on fire,
> and you keep him warm for the rest of his life.
> 
> ;-)

I like "Give a man a fish, and he eats for a day. Teach a man to fish
and he will bore you with stories of the one that got away for the rest
of his life".

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Sat Mar 13 08:15:49 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 13 Mar 2010 08:15:49 -0500
Subject: Python for newbies (Pythno users group in Macedonia)
In-Reply-To: <hpgq67-gai.ln1@archaeopteryx.softver.org.mk>
References: <hpgq67-gai.ln1@archaeopteryx.softver.org.mk>
Message-ID: <hng372$g8g$3@dough.gmane.org>

?????? ??????????? wrote:
> Hi all,
> we are starting with bi-monthly Python User Group meetings in Skopje, 
> Macedonia. The meetings are targeted for both beginners and more 
> experienced users.
> 
> The basic idea is to have an 1 hour presentation at the start for the 
> beginners and an 1 hour ad-hoc discussion about projects, applications, 
> interesting stuff etc.
> 
> I'd like to gather some guidance/experince/thoughts about some beginner 
> oriented python lectures we could use?
> 
> My first idea was to do something like the "Python module of the Week", 
> but maybe there's a better approach?
> 
> thanks
> 
If you are all English-speakers then perhaps you could consider showing
a PyCon video - see

  http://pycon.blip.tv

Good luck with the group. I hope to see PyCon Macedonia emerging before
too long!

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From vicente.soler at gmail.com  Sat Mar 13 08:16:52 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sat, 13 Mar 2010 05:16:52 -0800 (PST)
Subject: print formatting
Message-ID: <755bdc36-0fb2-4953-9549-148d0e090a68@o3g2000yqb.googlegroups.com>

Hello,

My script contains a print statement:

         print '%40s     %15d' % (k, m)

However,

         1- the string is right adjusted, and I would like it left
adjusted
         2- the number is a decimal number, and I would like it with
the thousands separator and 2 decimals

If possible, the thousands separator and the decimal separator should
use my local settings.

Is there any way to achieve this?


From steve at holdenweb.com  Sat Mar 13 08:31:32 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 13 Mar 2010 08:31:32 -0500
Subject: print formatting
In-Reply-To: <755bdc36-0fb2-4953-9549-148d0e090a68@o3g2000yqb.googlegroups.com>
References: <755bdc36-0fb2-4953-9549-148d0e090a68@o3g2000yqb.googlegroups.com>
Message-ID: <hng44h$k6t$1@dough.gmane.org>

vsoler wrote:
> Hello,
> 
> My script contains a print statement:
> 
>          print '%40s     %15d' % (k, m)
> 
> However,
> 
>          1- the string is right adjusted, and I would like it left
> adjusted
>          2- the number is a decimal number, and I would like it with
> the thousands separator and 2 decimals
> 
> If possible, the thousands separator and the decimal separator should
> use my local settings.
> 
> Is there any way to achieve this?

Left-alignment is achieved by using a negative width.

You can use the locale module to generate thousands-separated numeric
string representations:

>>> from locale import *
>>> setlocale(LC_ALL, '') # locale is otherwise 'C'
'en_US.UTF-8'
>>> locale.format("%12.3f", 123456.789, grouping=False)
'  123456.789'
>>> locale.format("%12.3f", 123456.789, grouping=True)
' 123,456.789'

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From __peter__ at web.de  Sat Mar 13 08:37:50 2010
From: __peter__ at web.de (Peter Otten)
Date: Sat, 13 Mar 2010 14:37:50 +0100
Subject: print formatting
References: <755bdc36-0fb2-4953-9549-148d0e090a68@o3g2000yqb.googlegroups.com>
Message-ID: <hng4fa$4qr$00$1@news.t-online.com>

vsoler wrote:

> My script contains a print statement:
> 
>          print '%40s     %15d' % (k, m)
> 
> However,
> 
>          1- the string is right adjusted, and I would like it left
> adjusted
>          2- the number is a decimal number, and I would like it with
> the thousands separator and 2 decimals
> 
> If possible, the thousands separator and the decimal separator should
> use my local settings.
> 
> Is there any way to achieve this?

>>> import locale
>>> locale.setlocale(locale.LC_ALL, "")
'de_DE.UTF-8'

Traditional:
>>> print '%-40s|%15s' % (k, locale.format("%d", m, grouping=True))
hello                                   |      1.234.567

New:
>>> "{0:<40} {1:15n}".format(k, m)
'hello                                          1.234.567'

See also:
http://docs.python.org/dev/py3k/library/string.html#formatstrings

Peter


From python at bdurham.com  Sat Mar 13 08:45:06 2010
From: python at bdurham.com (python at bdurham.com)
Date: Sat, 13 Mar 2010 08:45:06 -0500
Subject: python to exe
In-Reply-To: <50697b2c1003122047l5b8fa440lc6f1389b58d02df@mail.gmail.com>
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com><50697b2c1003122012q3c2530bt79666118bc639b87@mail.gmail.com><4B9B17B3.8000307@cnsp.com>
	<50697b2c1003122047l5b8fa440lc6f1389b58d02df@mail.gmail.com>
Message-ID: <1268487906.15871.1364627963@webmail.messagingengine.com>

Robin,

> do you of an alternate compilter it doesn't work (py2exe) on my windows 7 box

I can assure you that Py2exe does work on Windows 7 (my firm develops
commercial Python applications packaged using Py2exe running on Windows
7), but it does take a bit of fiddling and some patience. Join the
py2exe newsgroup and post your problems there.
https://lists.sourceforge.net/lists/listinfo/py2exe-users

You may also want to google 'Gui2exe'. This is a free front-end to
Py2exe that you can use to generate your Py2exe setup.py scripts. Note
that Gui2exe requires wxPython (free) to run.

Finally, make sure you are trying to compile 32-bit Python 2.x code. I
don't think py2exe supports Python 3.x or 64-bit versions of Python yet.

> Nope; py2exe is pretty much the go-to tool for this.

I hear great things about PyInstaller. The project is not dead - make
sure you use the latest version in the SVN.

Search stackoverflow.com for positive feedback and tips on PyInstaller.
Its on our plate to take a good look this product 'one of these days'.

Good luck!

Malcolm


From albert at spenarnc.xs4all.nl  Sat Mar 13 09:53:35 2010
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 13 Mar 2010 14:53:35 GMT
Subject: Question about typing: ints/floats
References: <50475f70-e6bf-4f11-b1ab-b91f4e1260f8@e36g2000yqc.googlegroups.com>
	<b800048f-b09e-4c39-bf15-9bcd3dae11bc@y11g2000yqh.googlegroups.com>
	<mailman.266.1267666113.23598.python-list@python.org>
Message-ID: <kz86pb.hbu@spenarnc.xs4all.nl>

In article <mailman.266.1267666113.23598.python-list at python.org>,
MRAB  <python at mrabarnett.plus.com> wrote:
>Zeeshan Quireshi wrote:
>> On Mar 3, 6:45 pm, Wells <thewellsoli... at gmail.com> wrote:
>>> This seems sort of odd to me:
>>>
>>>>>> a = 1
>>>>>> a += 1.202
>>>>>> a
>>> 2.202
>>>
>>> Indicates that 'a' was an int that was implicitly casted to a float.
>>> But:
>>>
>>>>>> a = 1
>>>>>> b = 3
>>>>>> a / b
>>> 0
>>>
>>> This does not implicitly do the casting, it treats 'a' and 'b' as
>>> integers, and the result as well. Changing 'b' to 3.0 will yield a
>>> float as a result (0.33333333333333331)
>>>
>>> Is there some way to explain the consistency here? Does python
>>> implicitly change the casting when you add variables of a different
>>> numeric type?
>>>
>>> Anyway, just  curiosity more than anything else. Thanks!
>>
>> Python, like most other languages performs only integer division when
>> both the operands are ints. So only if one of the types is a flot or
>> you explicitly cast your expression to be a double, then the value
>> will be a fraction. otherwise you will the quotient.
>
>int + int gives int
>float + float gives float
>int + float gives float

You skip a step here that the OP may have missed.
a = 1
a += 1.222
This invokes the calculation
    1 + 1.222
which is int + float.

Groetjes Albert

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- being exponential -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From karper12345 at yahoo.com  Sat Mar 13 09:55:07 2010
From: karper12345 at yahoo.com (Karjer Jdfjdf)
Date: Sat, 13 Mar 2010 06:55:07 -0800 (PST)
Subject: Use python and Jython together? (newbie)
Message-ID: <254688.8813.qm@web44705.mail.sp1.yahoo.com>

I'm pretty new at programming and want some advice on mixing Jython and Python.

I want to use Jython to access some Java libraries, but I want to keep developing in normal Python. Some modules I use a lot are not available in Jython.

The bulk of my programming is in Python but I want to use Java 2D libraries for graphical presentation of data generated in normal Python. Is it possible that I generate data in Python and then pass it through to a Jython program to visualise the data.



      
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From vicente.soler at gmail.com  Sat Mar 13 10:05:06 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sat, 13 Mar 2010 07:05:06 -0800 (PST)
Subject: building a dict
Message-ID: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>

Say that "m" is a tuple of 2-tuples

m=(('as',3), ('ab',5), (None, 1), ('as',None), ('as',6))

and I need to build a "d" dict where each key has an associated list
whose first element is the count, and the second is the sum. If a 2-
tuple contains a None value, it should be discarded.

The expected result is:
d={'as':[2, 9], 'ab': [1,5]}

How should I proceed? So far I have been unsuccessful. I have tried
with a "for" loop.

Thank you for your help


From lists at cheimes.de  Sat Mar 13 10:10:22 2010
From: lists at cheimes.de (Christian Heimes)
Date: Sat, 13 Mar 2010 16:10:22 +0100
Subject: Use python and Jython together? (newbie)
In-Reply-To: <254688.8813.qm@web44705.mail.sp1.yahoo.com>
References: <254688.8813.qm@web44705.mail.sp1.yahoo.com>
Message-ID: <4B9BAADE.7090208@cheimes.de>

Karjer Jdfjdf wrote:
> I'm pretty new at programming and want some advice on mixing Jython and Python.
> 
> I want to use Jython to access some Java libraries, but I want to keep developing in normal Python. Some modules I use a lot are not available in Jython.
> 
> The bulk of my programming is in Python but I want to use Java 2D libraries for graphical presentation of data generated in normal Python. Is it possible that I generate data in Python and then pass it through to a Jython program to visualise the data.

You can't mix Jython and Python in one program. But you can use other
means to create bindings for Java code. JCC
(http://pypi.python.org/pypi/JCC/2.5.1) is a very powerful code
generator for CPython.

Christian


From joncle at googlemail.com  Sat Mar 13 10:25:45 2010
From: joncle at googlemail.com (Jon Clements)
Date: Sat, 13 Mar 2010 07:25:45 -0800 (PST)
Subject: building a dict
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
Message-ID: <7f3ae1a0-5de8-4c98-9eec-086b7d927c5c@t41g2000yqt.googlegroups.com>

On 13 Mar, 15:05, vsoler <vicente.so... at gmail.com> wrote:
> Say that "m" is a tuple of 2-tuples
>
> m=(('as',3), ('ab',5), (None, 1), ('as',None), ('as',6))
>
> and I need to build a "d" dict where each key has an associated list
> whose first element is the count, and the second is the sum. If a 2-
> tuple contains a None value, it should be discarded.
>
> The expected result is:
> d={'as':[2, 9], 'ab': [1,5]}
>
> How should I proceed? So far I have been unsuccessful. I have tried
> with a "for" loop.
>
> Thank you for your help

Something like:

d = defaultdict( lambda: [0,0] )
for key, val in filter(lambda L: not any(i is None for i in L), m):
    d[key][0] += 1
    d[key][1] += val

hth

Jon


From pmaupin at gmail.com  Sat Mar 13 10:28:19 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sat, 13 Mar 2010 07:28:19 -0800 (PST)
Subject: building a dict
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
Message-ID: <3f56c242-7bf5-40c6-96d4-881d052db39a@o30g2000yqb.googlegroups.com>

On Mar 13, 9:05?am, vsoler <vicente.so... at gmail.com> wrote:
> Say that "m" is a tuple of 2-tuples
>
> m=(('as',3), ('ab',5), (None, 1), ('as',None), ('as',6))
>
> and I need to build a "d" dict where each key has an associated list
> whose first element is the count, and the second is the sum. If a 2-
> tuple contains a None value, it should be discarded.
>
> The expected result is:
> d={'as':[2, 9], 'ab': [1,5]}
>
> How should I proceed? So far I have been unsuccessful. I have tried
> with a "for" loop.

Post your first try at a for loop, and people might be willing to
point out problems, but this is such a basic for loop that it is
unlikely that anybody is going to write your ENTIRE homework for you.

Regards,
Pat


From albert at spenarnc.xs4all.nl  Sat Mar 13 10:29:54 2010
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 13 Mar 2010 15:29:54 GMT
Subject: Reverse engineering CRC?
References: <7vj7fdFnnjU1@mid.individual.net>
Message-ID: <kz88du.hk0@spenarnc.xs4all.nl>

In article <7vj7fdFnnjU1 at mid.individual.net>,
Gregory Ewing  <greg.ewing at canterbury.ac.nz> wrote:
>Given some known data/crc pairs, how feasible is it to
>figure out the polynomial being used to generate the crc?
>
>In the case I'm looking at, it appears that the crc
>size may be at least 24 bits, so just trying all possible
>polynomials probably isn't doable.
>
>An article I found hints at the possibility of using
>GCDs to make the search more efficient, but doesn't go
>into any details. Anyone know of any literature about
>this?
>
>If it helps, I have the ability to generate test cases
>with known message contents to some extent, although
>I don't have complete control over the contents. Also
>it's a manual process, so generating large numbers of
>them automatically isn't an option.

If it is really a CRC, it is doable.

You can have an indication, if the intention is to detect
machine errors (transmission or disk errors) or they want
you to prevent tampering with the file.
In the latter case it may be a one-way hash. Then it is near
impossible, as this is the design criterion for a one-way hash.

>--
>Greg

Groetjes Albert

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- being exponential -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From steve at holdenweb.com  Sat Mar 13 10:36:46 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 13 Mar 2010 10:36:46 -0500
Subject: building a dict
In-Reply-To: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
Message-ID: <hngbfd$8uu$1@dough.gmane.org>

vsoler wrote:
> Say that "m" is a tuple of 2-tuples
> 
> m=(('as',3), ('ab',5), (None, 1), ('as',None), ('as',6))
> 
> and I need to build a "d" dict where each key has an associated list
> whose first element is the count, and the second is the sum. If a 2-
> tuple contains a None value, it should be discarded.
> 
> The expected result is:
> d={'as':[2, 9], 'ab': [1,5]}
> 
> How should I proceed? So far I have been unsuccessful. I have tried
> with a "for" loop.
> 
> Thank you for your help

Here's a fairly simple-minded approach using a defaultdict, which calls
the dflt() function to create a value when the key is absent.

>>> from collections import defaultdict
>>> def dflt():
...     return [0, 0]
...
>>> m = (('as',3), ('ab',5), (None, 1), ('as',None), ('as',6))
>>> d = defaultdict(dflt)
>>> for key, n in m:
...   if key is not None and n is not None:
...     c, t = d[key]
...     d[key] = [c+1, t+n]
...
>>> d
defaultdict(<function dflt at 0x7f0bcb1b0ed8>,
{'as': [2, 9], 'ab': [1, 5]})
>>>

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From piet at vanoostrum.org  Sat Mar 13 10:41:12 2010
From: piet at vanoostrum.org (Piet van Oostrum)
Date: Sat, 13 Mar 2010 16:41:12 +0100
Subject: Ideas for creating processes
References: <36dec4ff1003101352g7d159742j2a0c76a6b0cd23fb@mail.gmail.com>
	<mailman.579.1268258709.23598.python-list@python.org>
Message-ID: <m2hbok6xgn.fsf@cochabamba.vanoostrum.org>

>>>>> J <dreadpiratejeff at gmail.com> (J) wrote:

>J> And now I'm looking at subprocess and I can set shell=True and it will
>J> intrepret special characters like &

>J> So could I do something like this:

>J> for item in pathlist:
>J>     subprocess.Popen('rsync command &', shell=True)

>J> and simply wait unti they are all done?

Using shell=True is often the wrong thing to do. And certainly just to
get a process to run in the background. subprocess will run them in the
background by default. Besides if you do it in the way you propose you
can't wait for them. You can only wait for the shell that starts the
rsync, but that will be finished almost immediately.

>>> import subprocess
>>> p = subprocess.Popen('sleep 1000 &', shell=True)
>>> p.wait()
0
>>>
The wait() returns immediately.
-- 
Piet van Oostrum <piet at vanoostrum.org>
WWW: http://pietvanoostrum.com/
PGP key: [8DAE142BE17999C4]
Nu Fair Trade woonaccessoires op http://www.zylja.com


From joncle at googlemail.com  Sat Mar 13 10:58:02 2010
From: joncle at googlemail.com (Jon Clements)
Date: Sat, 13 Mar 2010 07:58:02 -0800 (PST)
Subject: building a dict
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
	<3f56c242-7bf5-40c6-96d4-881d052db39a@o30g2000yqb.googlegroups.com>
Message-ID: <251a5a61-aa10-4050-bc0e-da36aed10697@i25g2000yqm.googlegroups.com>

On 13 Mar, 15:28, Patrick Maupin <pmau... at gmail.com> wrote:
> On Mar 13, 9:05?am, vsoler <vicente.so... at gmail.com> wrote:
>
> > Say that "m" is a tuple of 2-tuples
>
> > m=(('as',3), ('ab',5), (None, 1), ('as',None), ('as',6))
>
> > and I need to build a "d" dict where each key has an associated list
> > whose first element is the count, and the second is the sum. If a 2-
> > tuple contains a None value, it should be discarded.
>
> > The expected result is:
> > d={'as':[2, 9], 'ab': [1,5]}
>
> > How should I proceed? So far I have been unsuccessful. I have tried
> > with a "for" loop.
>
> Post your first try at a for loop, and people might be willing to
> point out problems, but this is such a basic for loop that it is
> unlikely that anybody is going to write your ENTIRE homework for you.
>
> Regards,
> Pat

I was thinking it's possibly homework, but looking at previous posts
it's fairly unlikely.

(If it is, then mea culpa, but as Steve has replied, I think I'll
manage to sleep tonight not worrying about the influx of uneducated,
incompetent and otherwise useless developers to the market).

However, they're receiving some 'elegant' solutions which no professor
(unless they're a star pupil - in which case they wouldn't be asking)
would take as having been done by their selves.
(Or at least I hope not)

But yes, I would certainly be interested in the 'unsuccessful
attempt'.
(To the OP, do post your attempts, it does give more validity).


Cheers,

Jon.



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From: dreamscmtr63 at gmail.com (earner)
Date: Sat, 13 Mar 2010 08:02:07 -0800 (PST)
Subject: Work at Home - Earn 50, 000 Weekly Without Investment Its Not A Fake, 
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Message-ID: <c8af3ba6-f87a-4ee3-b7c7-c003fe9d8f3e@t34g2000prm.googlegroups.com>

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From rurpy at yahoo.com  Sat Mar 13 11:13:51 2010
From: rurpy at yahoo.com (rurpy at yahoo.com)
Date: Sat, 13 Mar 2010 08:13:51 -0800 (PST)
Subject: building a dict
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
	<3f56c242-7bf5-40c6-96d4-881d052db39a@o30g2000yqb.googlegroups.com>
Message-ID: <289d7e7f-a068-487e-a918-17a39110d0f7@e1g2000yqh.googlegroups.com>

On Mar 13, 8:28 am, Patrick Maupin <pmau... at gmail.com> wrote:
> On Mar 13, 9:05 am, vsoler <vicente.so... at gmail.com> wrote:
>
> > Say that "m" is a tuple of 2-tuples
>
> > m=(('as',3), ('ab',5), (None, 1), ('as',None), ('as',6))
>
> > and I need to build a "d" dict where each key has an associated list
> > whose first element is the count, and the second is the sum. If a 2-
> > tuple contains a None value, it should be discarded.
>
> > The expected result is:
> > d={'as':[2, 9], 'ab': [1,5]}
>
> > How should I proceed? So far I have been unsuccessful. I have tried
> > with a "for" loop.
>
> Post your first try at a for loop, and people might be willing to
> point out problems, but this is such a basic for loop that it is
> unlikely that anybody is going to write your ENTIRE homework for you.

This is probably what you (OP) were trying to come up with?
[untested]

d = {}
for item in m:
    key = m[0];  value = m[1]
    if key is None or value is None: continue
    if key not in dict:
        d[key] = [value]
    else:
        d[key].append (value)

You can replace the
  for item in m:
      key = m[0];  value = m[1]
above with
  for key, value in m:
which is a little nicer.

However, as other responses point out, when you want
to "accumulate" results in a dict, collections.defaultdict
should pop into your mind first.


From mehgcap at gmail.com  Sat Mar 13 11:14:37 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Sat, 13 Mar 2010 11:14:37 -0500
Subject: wx error, I suspect my class
Message-ID: <bc7f680c1003130814vcc48f0bie61d40fa10505037@mail.gmail.com>

Hello all,
I am trying to make a gui out of xrc and wxpython, but I think my
understanding of Python's class/method structure is causing problems.
The below code returns an error on the line
  panel=xrc.XRCCTRL(mf, "dl")
The error goes back to wxPython itself and says "attribute error:
'none' type object has no attribute 'FindWindowById'"
Here is my complete code:

import wx
from wx import xrc

class myapp(wx.App):
 def OnInit(self):
  #load the xrc file
  res=xrc.XmlResource('dictionary.xrc')

  #load the frame containing everything else
  mf=res.LoadFrame(None, "mainframe")

  #assign all necessary controls to variables (text boxes and buttons)
for easier binding
  #format: varName=xrc.XRCCTRL(parent, IDFromXRCFile)
  panel=xrc.XRCCTRL(mf, "dl")
  btn_go=xrc.XRCCTRL(panel, "btn_go")
  btn_close=xrc.XRCCTRL(panel, "btn_close")

  #now bind the gui controls to functions
  mf.Bind(wx.EVT_BUTTON, close, id=xrc.XRCID("btn_close"))
  mf.Show()
 #end def OnInit

 def close(self):
  mf.Close(True)
 #end def close
#end class myapp

win=myapp(False)
win.MainLoop()

That is all there is to it. I made the xrc file with XRCed, so I know
it is properly formatted. I always see Python methods and classes
using the "self" keyword, but I never understood why or when to/not to
use it. I probably need it in the above code, but I am not sure how to
insert it correctly. I have been fighting with this code for the last
two days with no progress, so I would greatly appreciate any help you
can provide. Thanks.


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From joncle at googlemail.com  Sat Mar 13 11:19:09 2010
From: joncle at googlemail.com (Jon Clements)
Date: Sat, 13 Mar 2010 08:19:09 -0800 (PST)
Subject: Decorator to inject function into __call__ of a class
Message-ID: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>

This is semi-experimental and I'd appreciate opinions of whether it's
the correct design approach or not. It seems like a good idea, but it
doesn't mean it is.

I have a class 'A', this provides standard support functions and
exception handling.
I have 'B' and 'C' which specialise upon 'A'

What I'd like to achieve is something similar to:

@inject(B):
 def some_function(a, b):
     pass # something useful

The name 'some_function' is completely redundant -- don't need it,
don't actually care about the function afterwards, as long as it
becomes a __call__ of a 'B' *instance*.

I've basically got a huge list of functions, which need to be the
callable method of an object, and possibly at run-time, so I don't
want to do:

class Something(B):
    def __call__(self, etc.. etc...):
         pass # do something

I've got as far as type(somename, (B,), {}) -- do I then __init__ or
__new__ the object or...

In short, the function should be the __call__ method of an object that
is already __init__'d with the function arguments -- so that when the
object is called, I get the result of the the function (based on the
objects values).

Hope that makes sense,

Cheers,

Jon.








From missive at hotmail.com  Sat Mar 13 11:23:07 2010
From: missive at hotmail.com (Lee Harr)
Date: Sat, 13 Mar 2010 20:53:07 +0430
Subject: Some PyCon videos won't play
Message-ID: <SNT106-W28E9678F29E5527CFCBB88B1300@phx.gbl>


I am having a great time watching videos from PyCon. Thanks to
everyone who presented, and to those who did such a great job
putting the videos up at: http://pycon.blip.tv/

My trouble is that, although most of the videos play perfectly,
there are a few that refuse to play at all. Like:

Python 101
http://pycon.blip.tv/file/3322312/

Using Python to Create Robotic Simulations for Planetary Exploration
http://pycon.blip.tv/file/3332780/

Saturday Morning Lightning talks
http://pycon.blip.tv/file/3264041/


Is anyone else having trouble with these?

 		 	   		  
_________________________________________________________________
Your E-mail and More On-the-Go. Get Windows Live Hotmail Free.
https://signup.live.com/signup.aspx?id=60969


From pmaupin at gmail.com  Sat Mar 13 11:26:15 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sat, 13 Mar 2010 08:26:15 -0800 (PST)
Subject: Decorator to inject function into __call__ of a class
References: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>
Message-ID: <83cfee5e-6b6a-41e1-b259-9fdf104423b8@u9g2000yqb.googlegroups.com>

On Mar 13, 10:19?am, Jon Clements <jon... at googlemail.com> wrote:

> What I'd like to achieve is something similar to:
>
> @inject(B):
> ?def some_function(a, b):
> ? ? ?pass # something useful

So, just typing at the keyboard here, you mean something like:

class InjectClass(object):
    def __init__(self, func, *args, **kw):
        self.func = func
        self.args = args
        self.kw = kw
    def __call__(self):
        self.func(*self.args, **self.kw)

Or exactly what are you looking for?

Pat


From rurpy at yahoo.com  Sat Mar 13 11:26:59 2010
From: rurpy at yahoo.com (rurpy at yahoo.com)
Date: Sat, 13 Mar 2010 08:26:59 -0800 (PST)
Subject: building a dict
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
	<3f56c242-7bf5-40c6-96d4-881d052db39a@o30g2000yqb.googlegroups.com> 
	<289d7e7f-a068-487e-a918-17a39110d0f7@e1g2000yqh.googlegroups.com>
Message-ID: <91def698-98ba-4d63-b647-c13467e2a8c0@k17g2000yqb.googlegroups.com>

On Mar 13, 9:13?am, ru... at yahoo.com wrote:
> On Mar 13, 8:28 am, Patrick Maupin <pmau... at gmail.com> wrote:
>
>
>
> > On Mar 13, 9:05 am, vsoler <vicente.so... at gmail.com> wrote:
>
> > > Say that "m" is a tuple of 2-tuples
>
> > > m=(('as',3), ('ab',5), (None, 1), ('as',None), ('as',6))
>
> > > and I need to build a "d" dict where each key has an associated list
> > > whose first element is the count, and the second is the sum. If a 2-
> > > tuple contains a None value, it should be discarded.
>
> > > The expected result is:
> > > d={'as':[2, 9], 'ab': [1,5]}
>
> > > How should I proceed? So far I have been unsuccessful. I have tried
> > > with a "for" loop.
>
> > Post your first try at a for loop, and people might be willing to
> > point out problems, but this is such a basic for loop that it is
> > unlikely that anybody is going to write your ENTIRE homework for you.
>
> This is probably what you (OP) were trying to come up with?
> [untested]
>
> d = {}
> for item in m:
> ? ? key = m[0]; ?value = m[1]
> ? ? if key is None or value is None: continue
> ? ? if key not in dict:
> ? ? ? ? d[key] = [value]
> ? ? else:
> ? ? ? ? d[key].append (value)
>
> You can replace the
> ? for item in m:
> ? ? ? key = m[0]; ?value = m[1]
> above with
> ? for key, value in m:
> which is a little nicer.
>
> However, as other responses point out, when you want
> to "accumulate" results in a dict, collections.defaultdict
> should pop into your mind first.

Oops, didn't read very carefully, did I?

That should be:
d = {}
for item in m:
    key = m[0];  value = m[1]
    if key is None or value is None: continue
    if key not in dict:
        d[key] = [1, value]
    else:
        d[key][0] += 1
        d[key][1] += value



From joncle at googlemail.com  Sat Mar 13 11:38:16 2010
From: joncle at googlemail.com (Jon Clements)
Date: Sat, 13 Mar 2010 08:38:16 -0800 (PST)
Subject: Decorator to inject function into __call__ of a class
References: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>
	<83cfee5e-6b6a-41e1-b259-9fdf104423b8@u9g2000yqb.googlegroups.com>
Message-ID: <c3ea1b37-796c-42ba-96b4-688d8b6ced1f@g28g2000yqh.googlegroups.com>

On 13 Mar, 16:26, Patrick Maupin <pmau... at gmail.com> wrote:
> On Mar 13, 10:19?am, Jon Clements <jon... at googlemail.com> wrote:
>
> > What I'd like to achieve is something similar to:
>
> > @inject(B):
> > ?def some_function(a, b):
> > ? ? ?pass # something useful
>
> So, just typing at the keyboard here, you mean something like:
>
> class InjectClass(object):
> ? ? def __init__(self, func, *args, **kw):
> ? ? ? ? self.func = func
> ? ? ? ? self.args = args
> ? ? ? ? self.kw = kw
> ? ? def __call__(self):
> ? ? ? ? self.func(*self.args, **self.kw)
>
> Or exactly what are you looking for?
>
> Pat

Not quite.

Let's say I have function 'F':

def add(a, b): return a + b

And a base class of 'C' which does all the __init__ stuff or
whatever's needed,
the function 'add' should return a new class __init__'d with a and b,
but 'add'
should be the __call__ of that instance.

Hope that makes sense, and TY for your post,

Jon.


From jackdied at gmail.com  Sat Mar 13 11:42:51 2010
From: jackdied at gmail.com (Jack Diederich)
Date: Sat, 13 Mar 2010 11:42:51 -0500
Subject: Decorator to inject function into __call__ of a class
In-Reply-To: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>
References: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>
Message-ID: <b8e622741003130842l17935171xb3a75e372e59395b@mail.gmail.com>

On Sat, Mar 13, 2010 at 11:19 AM, Jon Clements <joncle at googlemail.com> wrote:
> This is semi-experimental and I'd appreciate opinions of whether it's
> the correct design approach or not. It seems like a good idea, but it
> doesn't mean it is.
>
> I have a class 'A', this provides standard support functions and
> exception handling.
> I have 'B' and 'C' which specialise upon 'A'
>
> What I'd like to achieve is something similar to:
>
> @inject(B):
> ?def some_function(a, b):
> ? ? pass # something useful
>
> The name 'some_function' is completely redundant -- don't need it,
> don't actually care about the function afterwards, as long as it
> becomes a __call__ of a 'B' *instance*.
>
> I've basically got a huge list of functions, which need to be the
> callable method of an object, and possibly at run-time, so I don't
> want to do:
>
> class Something(B):
> ? ?def __call__(self, etc.. etc...):
> ? ? ? ? pass # do something
>
> I've got as far as type(somename, (B,), {}) -- do I then __init__ or
> __new__ the object or...
>
> In short, the function should be the __call__ method of an object that
> is already __init__'d with the function arguments -- so that when the
> object is called, I get the result of the the function (based on the
> objects values).

I'm not sure exactly what you are asking for, but if what you want is
a bunch of different objects that vary only by their class's __call__
you could do it with a function that returns a new class based on A
but with a new __call__:

def make_new_call_class(base_class, call_func):
  class NewClass(base_class):
    def __call__(self, *args, **kw):
      return call_func(self, *args, *kw)
  return NewClass

or the return could even be NewClass() [return an instance] if this is
a one off.

That said, I'm not really sure what this behavior is good for.

-Jack


From pmaupin at gmail.com  Sat Mar 13 12:03:00 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sat, 13 Mar 2010 09:03:00 -0800 (PST)
Subject: Decorator to inject function into __call__ of a class
References: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>
	<83cfee5e-6b6a-41e1-b259-9fdf104423b8@u9g2000yqb.googlegroups.com> 
	<c3ea1b37-796c-42ba-96b4-688d8b6ced1f@g28g2000yqh.googlegroups.com>
Message-ID: <7c9e6c13-f388-44b9-8fc3-1faaacd8680a@t23g2000yqt.googlegroups.com>

On Mar 13, 10:38?am, Jon Clements <jon... at googlemail.com> wrote:
> On 13 Mar, 16:26, Patrick Maupin <pmau... at gmail.com> wrote:
>
>
>
> > On Mar 13, 10:19?am, Jon Clements <jon... at googlemail.com> wrote:
>
> > > What I'd like to achieve is something similar to:
>
> > > @inject(B):
> > > ?def some_function(a, b):
> > > ? ? ?pass # something useful
>
> > So, just typing at the keyboard here, you mean something like:
>
> > class InjectClass(object):
> > ? ? def __init__(self, func, *args, **kw):
> > ? ? ? ? self.func = func
> > ? ? ? ? self.args = args
> > ? ? ? ? self.kw = kw
> > ? ? def __call__(self):
> > ? ? ? ? self.func(*self.args, **self.kw)
>
> > Or exactly what are you looking for?
>
> > Pat
>
> Not quite.
>
> Let's say I have function 'F':
>
> def add(a, b): return a + b
>
> And a base class of 'C' which does all the __init__ stuff or
> whatever's needed,
> the function 'add' should return a new class __init__'d with a and b,
> but 'add'
> should be the __call__ of that instance.
>
> Hope that makes sense, and TY for your post,
>
> Jon.

Well, you could do it with a class.  But if I'm understanding
correctly, maybe it's simpler than that:

>>> def inject(*args, **kw):
...     def wrapper(func):
...         def go():
...             return func(*args, **kw)
...         return go
...     return wrapper
...
>>> @inject(20, 22)
... def add(a, b):
...     return a + b
...
>>> add()
42


From jlundell at pobox.com  Sat Mar 13 12:03:36 2010
From: jlundell at pobox.com (JLundell)
Date: Sat, 13 Mar 2010 09:03:36 -0800 (PST)
Subject: class inheritance
Message-ID: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>

I've got a subclass of fractions.Fraction called Value; it's a mostly
trivial class, except that it overrides __eq__ to mean 'nearly equal'.
However, since Fraction's operations result in a Fraction, not a
Value, I end up with stuff like this:

x = Value(1) + Value(2)

where x is now a Fraction, not a Value, and x == y uses
Fraction.__eq__ rather than Value.__eq__.

This appears to be standard Python behavior (int does the same thing).
I've worked around it by overriding __add__, etc, with functions that
invoke Fraction but coerce the result. But that's tedious; there are a
lot of methods to override.

So I'm wondering: is there a more efficient way to accomplish what I'm
after?


From pmaupin at gmail.com  Sat Mar 13 12:09:20 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sat, 13 Mar 2010 09:09:20 -0800 (PST)
Subject: class inheritance
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
Message-ID: <59af7283-f362-4d1e-92c7-14eab59555dd@g19g2000yqe.googlegroups.com>

On Mar 13, 11:03?am, JLundell <jlund... at pobox.com> wrote:
> I've got a subclass of fractions.Fraction called Value; it's a mostly
> trivial class, except that it overrides __eq__ to mean 'nearly equal'.
> However, since Fraction's operations result in a Fraction, not a
> Value, I end up with stuff like this:
>
> x = Value(1) + Value(2)
>
> where x is now a Fraction, not a Value, and x == y uses
> Fraction.__eq__ rather than Value.__eq__.
>
> This appears to be standard Python behavior (int does the same thing).
> I've worked around it by overriding __add__, etc, with functions that
> invoke Fraction but coerce the result. But that's tedious; there are a
> lot of methods to override.
>
> So I'm wondering: is there a more efficient way to accomplish what I'm
> after?

7 years ago, I had a similar problem for a different and now obsolete
reason.  I'm sure my solution could be easily updated though.  I wrote
code to write a wrapper class.  Sort of a meta-module.  Original
reference here:

http://groups.google.com/group/comp.lang.python/browse_frm/thread/1253bbab7dfd4b/59289c16603fb374?hl=en&lnk=gst&q=pmaupin+userint#59289c16603fb374

HTH,
Pat


From joncle at googlemail.com  Sat Mar 13 12:10:02 2010
From: joncle at googlemail.com (Jon Clements)
Date: Sat, 13 Mar 2010 09:10:02 -0800 (PST)
Subject: Decorator to inject function into __call__ of a class
References: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>
	<mailman.710.1268498573.23598.python-list@python.org>
Message-ID: <305a95c3-792e-4949-b1eb-20d794ed3218@g7g2000yqe.googlegroups.com>

On 13 Mar, 16:42, Jack Diederich <jackd... at gmail.com> wrote:
> On Sat, Mar 13, 2010 at 11:19 AM, Jon Clements <jon... at googlemail.com> wrote:
> > This is semi-experimental and I'd appreciate opinions of whether it's
> > the correct design approach or not. It seems like a good idea, but it
> > doesn't mean it is.
>
> > I have a class 'A', this provides standard support functions and
> > exception handling.
> > I have 'B' and 'C' which specialise upon 'A'
>
> > What I'd like to achieve is something similar to:
>
> > @inject(B):
> > ?def some_function(a, b):
> > ? ? pass # something useful
>
> > The name 'some_function' is completely redundant -- don't need it,
> > don't actually care about the function afterwards, as long as it
> > becomes a __call__ of a 'B' *instance*.
>
> > I've basically got a huge list of functions, which need to be the
> > callable method of an object, and possibly at run-time, so I don't
> > want to do:
>
> > class Something(B):
> > ? ?def __call__(self, etc.. etc...):
> > ? ? ? ? pass # do something
>
> > I've got as far as type(somename, (B,), {}) -- do I then __init__ or
> > __new__ the object or...
>
> > In short, the function should be the __call__ method of an object that
> > is already __init__'d with the function arguments -- so that when the
> > object is called, I get the result of the the function (based on the
> > objects values).
>
> I'm not sure exactly what you are asking for, but if what you want is
> a bunch of different objects that vary only by their class's __call__
> you could do it with a function that returns a new class based on A
> but with a new __call__:
>
> def make_new_call_class(base_class, call_func):
> ? class NewClass(base_class):
> ? ? def __call__(self, *args, **kw):
> ? ? ? return call_func(self, *args, *kw)
> ? return NewClass
>
> or the return could even be NewClass() [return an instance] if this is
> a one off.
>
> That said, I'm not really sure what this behavior is good for.
>
> -Jack

Cheers Jack for the response.

The behaviour is to not derive from a class, but rather allow
the decorators to do so... so I would like to iterate over
a list of functions (don't care what they're called) and then
inject the function as a method. If needs be at run-time.

Say I have 1000 functions (okay, admittedly over quoted), but
I don't want every programmer to inherit from 'B' or 'C', but
to 'inject'. So the idea is that classes are pre-defined, have
predictable behaviour, *except* the __call__ is different.

You are correct in this. Why do I want that behaviour? ->

- It's easier, no inheriting from a class, when needs not.
- Some integrity (anyone can define a function and 'inject' to the
Management class)
- Easier maintainability - maybe :)

for i in function_list:
    i = inject(function_list)

At the end of the day:
def blah(x, y, z):
   pass

That should be the callable of the object.

Cheers again,

Jon.



From rurpy at yahoo.com  Sat Mar 13 12:16:16 2010
From: rurpy at yahoo.com (rurpy at yahoo.com)
Date: Sat, 13 Mar 2010 09:16:16 -0800 (PST)
Subject: building a dict
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
	<3f56c242-7bf5-40c6-96d4-881d052db39a@o30g2000yqb.googlegroups.com> 
	<289d7e7f-a068-487e-a918-17a39110d0f7@e1g2000yqh.googlegroups.com> 
	<91def698-98ba-4d63-b647-c13467e2a8c0@k17g2000yqb.googlegroups.com>
Message-ID: <c40c6804-4870-4195-8766-732e10323184@e1g2000yqh.googlegroups.com>

On Mar 13, 9:26?am, ru... at yahoo.com wrote:
> That should be:
> d = {}
> for item in m:
  ? ? key = item[0]; ?value = item[1]
> ? ? if key is None or value is None: continue
> ? ? if key not in dict:
> ? ? ? ? d[key] = [1, value]
> ? ? else:
> ? ? ? ? d[key][0] += 1
> ? ? ? ? d[key][1] += value

That's it.  Any other mistakes, you find 'em.



From jackdied at gmail.com  Sat Mar 13 12:37:45 2010
From: jackdied at gmail.com (Jack Diederich)
Date: Sat, 13 Mar 2010 12:37:45 -0500
Subject: class inheritance
In-Reply-To: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
Message-ID: <b8e622741003130937j6a162a43g98d4896a21e6ef93@mail.gmail.com>

On Sat, Mar 13, 2010 at 12:03 PM, JLundell <jlundell at pobox.com> wrote:
> I've got a subclass of fractions.Fraction called Value; it's a mostly
> trivial class, except that it overrides __eq__ to mean 'nearly equal'.
> However, since Fraction's operations result in a Fraction, not a
> Value, I end up with stuff like this:
>
> x = Value(1) + Value(2)
>
> where x is now a Fraction, not a Value, and x == y uses
> Fraction.__eq__ rather than Value.__eq__.
>
> This appears to be standard Python behavior (int does the same thing).
> I've worked around it by overriding __add__, etc, with functions that
> invoke Fraction but coerce the result. But that's tedious; there are a
> lot of methods to override.
>
> So I'm wondering: is there a more efficient way to accomplish what I'm
> after?

If Fraction.__add__ returns a new object but the subclass Value is
compatible (as I would except since it is a sublcass) then just change
all references in Franction.__add__ to be more generic, ex/

class Franction():
  def __add__(self, other):
    return self.__classs__(self.denominator + other.denominator)

That way if __add__ is called by an instance of a subclass it will
return an instance of that subclass.

-Jack


From jackdied at gmail.com  Sat Mar 13 12:42:01 2010
From: jackdied at gmail.com (Jack Diederich)
Date: Sat, 13 Mar 2010 12:42:01 -0500
Subject: Decorator to inject function into __call__ of a class
In-Reply-To: <305a95c3-792e-4949-b1eb-20d794ed3218@g7g2000yqe.googlegroups.com>
References: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>
	<mailman.710.1268498573.23598.python-list@python.org>
	<305a95c3-792e-4949-b1eb-20d794ed3218@g7g2000yqe.googlegroups.com>
Message-ID: <b8e622741003130942s5b6b0430hb451be95221e6dcd@mail.gmail.com>

On Sat, Mar 13, 2010 at 12:10 PM, Jon Clements <joncle at googlemail.com> wrote:
> On 13 Mar, 16:42, Jack Diederich <jackd... at gmail.com> wrote:
>> On Sat, Mar 13, 2010 at 11:19 AM, Jon Clements <jon... at googlemail.com> wrote:
>> > This is semi-experimental and I'd appreciate opinions of whether it's
>> > the correct design approach or not. It seems like a good idea, but it
>> > doesn't mean it is.
>>
>> > I have a class 'A', this provides standard support functions and
>> > exception handling.
>> > I have 'B' and 'C' which specialise upon 'A'
>>
>> > What I'd like to achieve is something similar to:
>>
>> > @inject(B):
>> > ?def some_function(a, b):
>> > ? ? pass # something useful
>>
>> > The name 'some_function' is completely redundant -- don't need it,
>> > don't actually care about the function afterwards, as long as it
>> > becomes a __call__ of a 'B' *instance*.
>>
>> > I've basically got a huge list of functions, which need to be the
>> > callable method of an object, and possibly at run-time, so I don't
>> > want to do:
>>
>> > class Something(B):
>> > ? ?def __call__(self, etc.. etc...):
>> > ? ? ? ? pass # do something
>>
>> > I've got as far as type(somename, (B,), {}) -- do I then __init__ or
>> > __new__ the object or...
>>
>> > In short, the function should be the __call__ method of an object that
>> > is already __init__'d with the function arguments -- so that when the
>> > object is called, I get the result of the the function (based on the
>> > objects values).
>>
>> I'm not sure exactly what you are asking for, but if what you want is
>> a bunch of different objects that vary only by their class's __call__
>> you could do it with a function that returns a new class based on A
>> but with a new __call__:
>>
>> def make_new_call_class(base_class, call_func):
>> ? class NewClass(base_class):
>> ? ? def __call__(self, *args, **kw):
>> ? ? ? return call_func(self, *args, *kw)
>> ? return NewClass
>>
>> or the return could even be NewClass() [return an instance] if this is
>> a one off.
>>
>> That said, I'm not really sure what this behavior is good for.
>>
>> -Jack
>
> Cheers Jack for the response.
>
> The behaviour is to not derive from a class, but rather allow
> the decorators to do so... so I would like to iterate over
> a list of functions (don't care what they're called) and then
> inject the function as a method. If needs be at run-time.
>
> Say I have 1000 functions (okay, admittedly over quoted), but
> I don't want every programmer to inherit from 'B' or 'C', but
> to 'inject'. So the idea is that classes are pre-defined, have
> predictable behaviour, *except* the __call__ is different.
>
> You are correct in this. Why do I want that behaviour? ->
>
> - It's easier, no inheriting from a class, when needs not.
> - Some integrity (anyone can define a function and 'inject' to the
> Management class)
> - Easier maintainability - maybe :)
>
> for i in function_list:
> ? ?i = inject(function_list)
>
> At the end of the day:
> def blah(x, y, z):
> ? pass
>
> That should be the callable of the object.

I'm still not sure why you are trying to do this, but you can do it
with delegation.  Have the parent class's __call__ look for an
instance attribute named call_this and then call it, ex/

class A():
  def __call__(self, *args, **kw):
    self.call_this(*args, **kw)  # we grab this off the instance

ob = A()
def my_func(*stuff): pass
ob.call_this = my_func

-Jack


From pmaupin at gmail.com  Sat Mar 13 12:44:38 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sat, 13 Mar 2010 09:44:38 -0800 (PST)
Subject: class inheritance
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
	<mailman.711.1268501867.23598.python-list@python.org>
Message-ID: <5e8a6388-7532-4183-a69e-bc4330e34b83@t20g2000yqe.googlegroups.com>

On Mar 13, 11:37?am, Jack Diederich <jackd... at gmail.com> wrote:
> If Fraction.__add__ returns a new object but the subclass Value is
> compatible (as I would except since it is a sublcass) then just change
> all references in Franction.__add__ to be more generic, ex/
>
> class Franction():
> ? def __add__(self, other):
> ? ? return self.__classs__(self.denominator + other.denominator)
>
> That way if __add__ is called by an instance of a subclass it will
> return an instance of that subclass.
>

Yes, I think the OP understands that, and also understands that he
would have to do the same thing for __sub__, __div__, __rsub__,
__radd__, etc.

That's why I suggested that, instead of writing all that tedious code,
he could write code that writes the tedious code :-)

As Terence Parr of ANTLER fame asks:  "Why program by hand in five
days what you can spend five years of your life automating?"

Pat


From martin.schoon at gmail.com  Sat Mar 13 13:04:19 2010
From: martin.schoon at gmail.com (Martin =?utf-8?B?U2Now7bDtm4=?=)
Date: Sat, 13 Mar 2010 19:04:19 +0100
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
	<hnfmek$o5a$1@speranza.aioe.org>
	<mailman.698.1268477864.23598.python-list@python.org>
Message-ID: <87aaucxfmk.fsf@crunchbang.Belkin>

Mark Lawrence <breamoreboy at yahoo.co.uk> writes:
>
> I'm certain that members of the Guinea Pig Club might have something
> to say on that one, see :-
> http://en.wikipedia.org/wiki/Guinea_Pig_Club

Interesting. My mum is a retired surgeon and in the mid 1980s she
attended a course in plastic surgery and among other things she
learnt that plastic surgery got going for real during WWII 'thanks'
to all pilots with burns. I have forwarded the link above to her.

/Martin


From jlundell at pobox.com  Sat Mar 13 13:11:15 2010
From: jlundell at pobox.com (JLundell)
Date: Sat, 13 Mar 2010 10:11:15 -0800 (PST)
Subject: class inheritance
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
	<mailman.711.1268501867.23598.python-list@python.org>
Message-ID: <e43530db-4a8a-42ef-8ac1-cb622a99d247@w27g2000pre.googlegroups.com>

On Mar 13, 9:37?am, Jack Diederich <jackd... at gmail.com> wrote:
> If Fraction.__add__ returns a new object but the subclass Value is
> compatible (as I would except since it is a sublcass) then just change
> all references in Franction.__add__ to be more generic, ex/
>
> class Franction():
> ? def __add__(self, other):
> ? ? return self.__classs__(self.denominator + other.denominator)
>
> That way if __add__ is called by an instance of a subclass it will
> return an instance of that subclass.

That was my first thought, because I had originally assumed that's the
way Fraction worked. However, a) it's easier to do the overriding in
my own class than patching Fraction (or at least no harder), and 2)
Fraction is only doing the same thing that int does, so it's hard to
justify a patch.

I think Patrick's solution might be the tidiest one. I'll give it a
shot (thanks, Patrick).


From python at mrabarnett.plus.com  Sat Mar 13 13:13:46 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 13 Mar 2010 18:13:46 +0000
Subject: Use python and Jython together? (newbie)
In-Reply-To: <254688.8813.qm@web44705.mail.sp1.yahoo.com>
References: <254688.8813.qm@web44705.mail.sp1.yahoo.com>
Message-ID: <4B9BD5DA.1060907@mrabarnett.plus.com>

Karjer Jdfjdf wrote:
> I'm pretty new at programming and want some advice on mixing Jython and 
> Python.
> 
> I want to use Jython to access some Java libraries, but I want to keep 
> developing in normal Python. Some modules I use a lot are not available 
> in Jython.
> 
> The bulk of my programming is in Python but I want to use Java 2D 
> libraries for graphical presentation of data generated in normal Python. 
> Is it possible that I generate data in Python and then pass it through 
> to a Jython program to visualise the data.
> 
You could have 2 scripts running, one in CPython and the other in
Jython, communicating via sockets. You would need to decide on a
protocol, perhaps passing the data as strings encoded in UTF-8.


From news1234 at free.fr  Sat Mar 13 13:45:53 2010
From: news1234 at free.fr (News123)
Date: Sat, 13 Mar 2010 19:45:53 +0100
Subject: how to start a python script only once
Message-ID: <4b9bdd61$0$22515$426a74cc@news.free.fr>

Hi,

I'd like to make sure, that a certain python program will only be run
once per host. (linux/windows)


so if the program is started a second time it should just terminate and
let the other one run.

This does not have to be the fastest solution, but it should be reliable.


I have a few ideas, but wonder, which one is the most common


My ideas so far:

pid file and file locking
--------------------------
create a file like program.pid  with the pid of the running program an
use file locking to avoid race connditions.

However I currently don't know how to do file locking under windows
and I don't know how to do file lockng with python and linux.
I'll start googling.

sqlite and locking
--------------------
quite some time ago I used a mysql table and locking as an inter-host mutex.

Perhaps sqlite would be good enough for an inter process mutex for
processes on the same host, but I don't know it well enough.


interprocess mutex
--------------------
well I even don't know whether something like this exists on linux / windows


Thanks in advanced for any tips



N


From john at castleamber.com  Sat Mar 13 13:52:39 2010
From: john at castleamber.com (John Bokma)
Date: Sat, 13 Mar 2010 12:52:39 -0600
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
Message-ID: <87fx443vgo.fsf@castleamber.com>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:

> As the old proverb goes: give a man a fish, and you feed him for a day. 
> Teach him how to fish, and he has food forever.

True, but you don't teach someone fishing by poking an eye out with a
fishing rod.

> I'm an old-fashioned kind of guy, and don't like LMGTFY because it is 
> tiresome and requires Javascript. I prefer:

My reply had little to do with lmgtfy and all to do with hiding it behind
tinyurl. But even then, why not do what you just did: give a URL to
google directly.

For quite some time I thought that comp.lang.perl.misc was quite
unfriendly because of a certain attitude. comp.lang.python was quite a
refreshment for a while: very newbie friendly, less pissing contests,
etc. (but way more fanboism). 

Yesterday was a sady day: I finally had to conclude that it was only
wishful thinking on my part; there is no difference.

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From tjreedy at udel.edu  Sat Mar 13 14:01:34 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 13 Mar 2010 14:01:34 -0500
Subject: Some PyCon videos won't play
In-Reply-To: <SNT106-W28E9678F29E5527CFCBB88B1300@phx.gbl>
References: <SNT106-W28E9678F29E5527CFCBB88B1300@phx.gbl>
Message-ID: <hngnee$df1$1@dough.gmane.org>

On 3/13/2010 11:23 AM, Lee Harr wrote:
>
> I am having a great time watching videos from PyCon. Thanks to
> everyone who presented, and to those who did such a great job
> putting the videos up at: http://pycon.blip.tv/
>
> My trouble is that, although most of the videos play perfectly,
> there are a few that refuse to play at all. Like:
>
> Python 101
> http://pycon.blip.tv/file/3322312/
>
> Using Python to Create Robotic Simulations for Planetary Exploration
> http://pycon.blip.tv/file/3332780/
>
> Saturday Morning Lightning talks
> http://pycon.blip.tv/file/3264041/
>
>
> Is anyone else having trouble with these?

Yes, 'spinner' spins indefinitely, while others load and play.



From apt.shansen at gmail.com  Sat Mar 13 14:02:34 2010
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sat, 13 Mar 2010 11:02:34 -0800
Subject: Decorator to inject function into __call__ of a class
In-Reply-To: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>
References: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>
Message-ID: <7a9c25c21003131102x15f7e98agfc1c6ea73962ead1@mail.gmail.com>

On Sat, Mar 13, 2010 at 8:19 AM, Jon Clements <joncle at googlemail.com> wrote:

> The name 'some_function' is completely redundant -- don't need it,
> don't actually care about the function afterwards, as long as it
> becomes a __call__ of a 'B' *instance*.
>

Special methods are looked up on the class, not the instance, so you can't
dot his. However, from reading this thread, I think you're just a bit hung
up on naming: you don't need these random / arbitrary functions to be the
__call__ on an instance.

You need these functions to be called when said instance is called.

The easiest way to do that is simply define on the class:

def __call__(self, *args, **kwargs):
    self.func(*args, **kwargs)

Then while you are iterating over your list of a thousand functions and
making instances, just assign each instance's func attribute.

So,

for fn in [function_one, function_two, function_three, function_four]:
    inst = B()
    inst.func = fn

Now, if you really like the decorator syntax, sure:

>> def inject(klass):
...     def decorator(fn):
...             inst = klass()
...             inst.func = fn
...             return inst
...     return decorator
...
>>> class A:
...     def __init__(self):
...             pass
...     def __call__(self, *args, **kwargs):
...             self.func(*args, **kwargs)
...
>>> @inject(A)
... def test(mmm):
...     print mmm
...
>>> test
<__main__.A instance at 0x1004a4fc8>
>>> test("Hello")
Hello

Now, I don't -fully- understand what you're trying to do so this may not be
precisely the right thing, but you should be able to adapt the theory.

--S
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From joncle at googlemail.com  Sat Mar 13 14:02:44 2010
From: joncle at googlemail.com (Jon Clements)
Date: Sat, 13 Mar 2010 11:02:44 -0800 (PST)
Subject: Decorator to inject function into __call__ of a class
References: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>
	<mailman.710.1268498573.23598.python-list@python.org>
	<305a95c3-792e-4949-b1eb-20d794ed3218@g7g2000yqe.googlegroups.com>
	<mailman.712.1268502128.23598.python-list@python.org>
Message-ID: <714d79b0-af65-4ce1-806a-73aa1e9b561d@t20g2000yqe.googlegroups.com>

On 13 Mar, 17:42, Jack Diederich <jackd... at gmail.com> wrote:
> On Sat, Mar 13, 2010 at 12:10 PM, Jon Clements <jon... at googlemail.com> wrote:
> > On 13 Mar, 16:42, Jack Diederich <jackd... at gmail.com> wrote:
> >> On Sat, Mar 13, 2010 at 11:19 AM, Jon Clements <jon... at googlemail.com> wrote:
> >> > This is semi-experimental and I'd appreciate opinions of whether it's
> >> > the correct design approach or not. It seems like a good idea, but it
> >> > doesn't mean it is.
>
> >> > I have a class 'A', this provides standard support functions and
> >> > exception handling.
> >> > I have 'B' and 'C' which specialise upon 'A'
>
> >> > What I'd like to achieve is something similar to:
>
> >> > @inject(B):
> >> > ?def some_function(a, b):
> >> > ? ? pass # something useful
>
> >> > The name 'some_function' is completely redundant -- don't need it,
> >> > don't actually care about the function afterwards, as long as it
> >> > becomes a __call__ of a 'B' *instance*.
>
> >> > I've basically got a huge list of functions, which need to be the
> >> > callable method of an object, and possibly at run-time, so I don't
> >> > want to do:
>
> >> > class Something(B):
> >> > ? ?def __call__(self, etc.. etc...):
> >> > ? ? ? ? pass # do something
>
> >> > I've got as far as type(somename, (B,), {}) -- do I then __init__ or
> >> > __new__ the object or...
>
> >> > In short, the function should be the __call__ method of an object that
> >> > is already __init__'d with the function arguments -- so that when the
> >> > object is called, I get the result of the the function (based on the
> >> > objects values).
>
> >> I'm not sure exactly what you are asking for, but if what you want is
> >> a bunch of different objects that vary only by their class's __call__
> >> you could do it with a function that returns a new class based on A
> >> but with a new __call__:
>
> >> def make_new_call_class(base_class, call_func):
> >> ? class NewClass(base_class):
> >> ? ? def __call__(self, *args, **kw):
> >> ? ? ? return call_func(self, *args, *kw)
> >> ? return NewClass
>
> >> or the return could even be NewClass() [return an instance] if this is
> >> a one off.
>
> >> That said, I'm not really sure what this behavior is good for.
>
> >> -Jack
>
> > Cheers Jack for the response.
>
> > The behaviour is to not derive from a class, but rather allow
> > the decorators to do so... so I would like to iterate over
> > a list of functions (don't care what they're called) and then
> > inject the function as a method. If needs be at run-time.
>
> > Say I have 1000 functions (okay, admittedly over quoted), but
> > I don't want every programmer to inherit from 'B' or 'C', but
> > to 'inject'. So the idea is that classes are pre-defined, have
> > predictable behaviour, *except* the __call__ is different.
>
> > You are correct in this. Why do I want that behaviour? ->
>
> > - It's easier, no inheriting from a class, when needs not.
> > - Some integrity (anyone can define a function and 'inject' to the
> > Management class)
> > - Easier maintainability - maybe :)
>
> > for i in function_list:
> > ? ?i = inject(function_list)
>
> > At the end of the day:
> > def blah(x, y, z):
> > ? pass
>
> > That should be the callable of the object.
>
> I'm still not sure why you are trying to do this, but you can do it
> with delegation. ?Have the parent class's __call__ look for an
> instance attribute named call_this and then call it, ex/
>
> class A():
> ? def __call__(self, *args, **kw):
> ? ? self.call_this(*args, **kw) ?# we grab this off the instance
>
> ob = A()
> def my_func(*stuff): pass
> ob.call_this = my_func
>
> -Jack

Jack, thanks very much for your replies -- hugely appreciated.

I was delayed by the missus calling me for dinner - I'd forgotten
we had a stew going in the slow cooker, and she can't make
dumplings to save her life :)

If I can re-explain slightly, say I have a class 'compute':

class Compute(object):
    def __init__(self, something):
        self.something = something
    # misc other methods here.....

then...

class ComputeAdd(Compute):
    pass

If I do,

@inject
def ComputeAdd(fst, snd):
    return fst + snd

The end result should be a new class called ComputeAdd __init__'d with
fst and snd,
which when called, returns fst + snd.

Hope that makes sense.

Cheers,

Jon.



From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 13 14:23:08 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 13 Mar 2010 19:23:08 GMT
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
	<87fx443vgo.fsf@castleamber.com>
Message-ID: <4b9be61c$0$27822$c3e8da3@news.astraweb.com>

On Sat, 13 Mar 2010 12:52:39 -0600, John Bokma wrote:

> For quite some time I thought that comp.lang.perl.misc was quite
> unfriendly because of a certain attitude. comp.lang.python was quite a
> refreshment for a while: very newbie friendly, less pissing contests,
> etc. (but way more fanboism).
> 
> Yesterday was a sady day: I finally had to conclude that it was only
> wishful thinking on my part; there is no difference.


You were the first one to inject abuse into this thread. There's a big 
difference between a mildly sarcastic link and dropping the F-word at one 
of the more helpful and respected members of the community. Perhaps you 
are projecting your own hostility and aggro onto others?



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 13 14:48:28 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 13 Mar 2010 19:48:28 GMT
Subject: Decorator to inject function into __call__ of a class
References: <7db4b480-51d7-41c0-b6df-f78cdcb7892e@t20g2000yqe.googlegroups.com>
	<mailman.710.1268498573.23598.python-list@python.org>
	<305a95c3-792e-4949-b1eb-20d794ed3218@g7g2000yqe.googlegroups.com>
	<mailman.712.1268502128.23598.python-list@python.org>
	<714d79b0-af65-4ce1-806a-73aa1e9b561d@t20g2000yqe.googlegroups.com>
Message-ID: <4b9bec0b$0$27822$c3e8da3@news.astraweb.com>

On Sat, 13 Mar 2010 11:02:44 -0800, Jon Clements wrote:

> If I can re-explain slightly, say I have a class 'compute':
> 
> class Compute(object):
>     def __init__(self, something):
>         self.something = something
>     # misc other methods here.....
> 
> then...
> 
> class ComputeAdd(Compute):
>     pass


What's the purpose of the do-nothing subclass?


> If I do,
> 
> @inject
> def ComputeAdd(fst, snd):
>     return fst + snd
> 
> The end result should be a new class called ComputeAdd __init__'d with
> fst and snd,

That will cause a TypeError, because ComputeAdd inherits __init__ from 
Compute, which only takes a single argument. So you can't initialise it 
with two.


> which when called, returns fst + snd.
>
> Hope that makes sense.

None what so ever, even after reading the entire thread :-)

Forget about the *mechanism*, and focus on the *result* you want. Let me 
see if I can guess what result you want.

You want to start with a single base class, say Compute as defined above.

Then you want to write a function which interacts with Compute somehow, 
say:

def func(self, x, y):
    return self.something + x + y

and wave some sort of magic wand (a decorator? something else?) to get an 
object x so that:

x("a", "b")

returns self.something + "a" + "b".

Is that right? If not, I have no idea what you want! But if this is what 
you want, then this is probably the simplest approach:

Start by adding delegation to the Compute class:

class Compute(object):
    def __init__(self, something):
        self.something = something
    def __call__(self, *args, **kwargs):
        return self.function(*args, **kwargs)

Then you can initialise an instance of Compute, and add a function to it:

def func(self, x, y):
    return self.something + x + y

added = Computer("spam")
added.function = func

And then say:

added("ham", "eggs")
-> "spamhameggs"


You could possibly even turn this into a decorator:

# untested
def magic(baseclass, *args):
    instance = baseclass(*args)
    def decorator(func):
        instance.function = func
        return instance
    return decorator
        
@magic(Compute, "spam")
def func(self, x, y):
    return self.something + x + y


func("ham", "eggs")
-> "spamhameggs"




Hope this helps.


-- 
Steven


From martin.hellwig at dcuktec.org  Sat Mar 13 15:16:48 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Sat, 13 Mar 2010 20:16:48 +0000
Subject: python to exe
In-Reply-To: <4b9be61c$0$27822$c3e8da3@news.astraweb.com>
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>	<87bpes6e4l.fsf@castleamber.com>	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>	<87fx443vgo.fsf@castleamber.com>
	<4b9be61c$0$27822$c3e8da3@news.astraweb.com>
Message-ID: <hngrrc$4at$1@news.eternal-september.org>

On 03/13/10 19:23, Steven D'Aprano wrote:
> On Sat, 13 Mar 2010 12:52:39 -0600, John Bokma wrote:
>
>> For quite some time I thought that comp.lang.perl.misc was quite
>> unfriendly because of a certain attitude. comp.lang.python was quite a
>> refreshment for a while: very newbie friendly, less pissing contests,
>> etc. (but way more fanboism).
>>
>> Yesterday was a sady day: I finally had to conclude that it was only
>> wishful thinking on my part; there is no difference.
>
>
> You were the first one to inject abuse into this thread. There's a big
> difference between a mildly sarcastic link and dropping the F-word at one
> of the more helpful and respected members of the community. Perhaps you
> are projecting your own hostility and aggro onto others?
>
>
>
John's thought process is a slippery slope and I make the same 'mistake' 
(notice the quotes please :-)) so often it would seem I won't learn it 
ever. However on the rare occasion I notice that I am making the mistake 
I say to myself: The view of a number of individuals do NOT necessarily 
represent the view of the majority unless proven otherwise by that 
actual majority.

-- 
mph


From almar.klein at gmail.com  Sat Mar 13 15:17:43 2010
From: almar.klein at gmail.com (Almar Klein)
Date: Sat, 13 Mar 2010 21:17:43 +0100
Subject: python to exe
In-Reply-To: <1e3b567.3797.12756f99dda.Coremail.dr.cg@126.com>
References: <1e3b567.3797.12756f99dda.Coremail.dr.cg@126.com>
Message-ID: <cc38d75f1003131217p593e114ap69238096b412cce3@mail.gmail.com>

>Does anyone know of a good python to stand alone exe compiler?

>
> >Thanks,
> >-Robin
> I tried several such tools and found the easiest one: Pyinstaller (
> http://www.pyinstaller.org/ )
>

Don't forget cx_freeze! I found it to work pretty easy, and it also works
for py3k.

Almar
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From pavlovevidence at gmail.com  Sat Mar 13 15:26:45 2010
From: pavlovevidence at gmail.com (Carl Banks)
Date: Sat, 13 Mar 2010 12:26:45 -0800 (PST)
Subject: class inheritance
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
Message-ID: <9bb4c1e7-858e-4ee6-870b-5a6549b6c496@b36g2000pri.googlegroups.com>

On Mar 13, 9:03?am, JLundell <jlund... at pobox.com> wrote:
> I've got a subclass of fractions.Fraction called Value; it's a mostly
> trivial class, except that it overrides __eq__ to mean 'nearly equal'.
> However, since Fraction's operations result in a Fraction, not a
> Value, I end up with stuff like this:
>
> x = Value(1) + Value(2)
>
> where x is now a Fraction, not a Value, and x == y uses
> Fraction.__eq__ rather than Value.__eq__.
>
> This appears to be standard Python behavior (int does the same thing).
> I've worked around it by overriding __add__, etc, with functions that
> invoke Fraction but coerce the result. But that's tedious; there are a
> lot of methods to override.
>
> So I'm wondering: is there a more efficient way to accomplish what I'm
> after?

It's a tad unfortunately Python doesn't make this easier.  If I had to
do it more than once I'd probably write a mixin to do it:

class ArithmeticSelfCastMixin(object):
    def __add__(self,other):
        return
self.__class__(super(ArithmeticSelfCastMixin,self).__add__(other)
    # etc.


class Value(ArithmeticSelfCastMixin,fraction.Fraction):
    pass


However, I want to warn you about overriding __eq__ to mean "almost
equal": it can have unexpected results so I don't recommend it.  Two
of the main issues with it are:

1. It violates the transitive property ("If A == B and B == C, then A
== C") which most programmers expect to be true.

2. It will give unpredictable results when the objects are used in
sets or as dictionary keys.  Those thow types expect the transitive
property to be true.  If you are going to redefine __eq__ to mean
"almost equal", then at least define __hash__ to raise
NotImplementedError so that Python will refuse to use them in sets or
as dictionary keys:

    def __hash__(self): raise NotImplementedError


Carl Banks


From mcfletch at vrplumber.com  Sat Mar 13 16:12:02 2010
From: mcfletch at vrplumber.com (Mike C. Fletcher)
Date: Sat, 13 Mar 2010 16:12:02 -0500
Subject: Python for newbies (Pythno users group in Macedonia)
In-Reply-To: <hpgq67-gai.ln1@archaeopteryx.softver.org.mk>
References: <hpgq67-gai.ln1@archaeopteryx.softver.org.mk>
Message-ID: <4B9BFFA2.7080305@vrplumber.com>

?????? ??????????? wrote:
> Hi all,
> we are starting with bi-monthly Python User Group meetings in Skopje, 
> Macedonia. The meetings are targeted for both beginners and more 
> experienced users.
>   
...
http://us.pycon.org/2010/conference/schedule/event/108/

HTH,
Mike

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com



From vicente.soler at gmail.com  Sat Mar 13 16:42:12 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sat, 13 Mar 2010 13:42:12 -0800 (PST)
Subject: building a dict
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
	<3f56c242-7bf5-40c6-96d4-881d052db39a@o30g2000yqb.googlegroups.com> 
	<289d7e7f-a068-487e-a918-17a39110d0f7@e1g2000yqh.googlegroups.com> 
	<91def698-98ba-4d63-b647-c13467e2a8c0@k17g2000yqb.googlegroups.com> 
	<c40c6804-4870-4195-8766-732e10323184@e1g2000yqh.googlegroups.com>
Message-ID: <0ed22def-8cb9-47ec-8df8-60439810819a@g10g2000yqh.googlegroups.com>

On 13 mar, 18:16, ru... at yahoo.com wrote:
> On Mar 13, 9:26?am, ru... at yahoo.com wrote:> That should be:
> > d = {}
> > for item in m:
>
> ? ? ? key = item[0]; ?value = item[1]
>
> > ? ? if key is None or value is None: continue
> > ? ? if key not in dict:
> > ? ? ? ? d[key] = [1, value]
> > ? ? else:
> > ? ? ? ? d[key][0] += 1
> > ? ? ? ? d[key][1] += value
>
> That's it. ?Any other mistakes, you find 'em.

Thank you all. Your answers are more than valuable to me. I'll study
them carefully, but no doubt, my post has been answered.

By the way, I suppose I am the OP. Since I am not an native English
speaking person, I do not know what it stands for. Perhaps you can
tell me.

>From what I see from your posts, you would have preferred that I
included in my original post my "for loop", so that the post is not so
abstract. I have taken note and I'll make it better next time.

Thank you for your help.

Vicente Soler


From rurpy at yahoo.com  Sat Mar 13 17:04:54 2010
From: rurpy at yahoo.com (rurpy at yahoo.com)
Date: Sat, 13 Mar 2010 14:04:54 -0800 (PST)
Subject: building a dict
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
	<3f56c242-7bf5-40c6-96d4-881d052db39a@o30g2000yqb.googlegroups.com> 
	<289d7e7f-a068-487e-a918-17a39110d0f7@e1g2000yqh.googlegroups.com> 
	<91def698-98ba-4d63-b647-c13467e2a8c0@k17g2000yqb.googlegroups.com> 
	<c40c6804-4870-4195-8766-732e10323184@e1g2000yqh.googlegroups.com> 
	<0ed22def-8cb9-47ec-8df8-60439810819a@g10g2000yqh.googlegroups.com>
Message-ID: <45fd2042-280c-4b7c-ab1f-54a41f6b0cec@o3g2000yqb.googlegroups.com>

On Mar 13, 2:42?pm, vsoler <vicente.so... at gmail.com> wrote:

> By the way, I suppose I am the OP. Since I am not an native English
> speaking person, I do not know what it stands for. Perhaps you can
> tell me.

OP means Original Poster (the person who started the discussion)
or sometimes Original Post, depending on context.


From g.bogle at auckland.no.spam.ac.nz  Sat Mar 13 17:20:15 2010
From: g.bogle at auckland.no.spam.ac.nz (Gib Bogle)
Date: Sun, 14 Mar 2010 11:20:15 +1300
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>	<87bpes6e4l.fsf@castleamber.com>	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>	<hnfmek$o5a$1@speranza.aioe.org>
	<mailman.698.1268477864.23598.python-list@python.org>
Message-ID: <hnh32u$5j6$2@speranza.aioe.org>

Mark Lawrence wrote:
> 
> I'm certain that members of the Guinea Pig Club might have something to 
> say on that one, see :-
> http://en.wikipedia.org/wiki/Guinea_Pig_Club
> 

You mean, something like: "That's not funny"?


From waldemar.osuch at gmail.com  Sat Mar 13 18:12:11 2010
From: waldemar.osuch at gmail.com (Waldemar Osuch)
Date: Sat, 13 Mar 2010 15:12:11 -0800 (PST)
Subject: Use python and Jython together? (newbie)
References: <254688.8813.qm@web44705.mail.sp1.yahoo.com>
	<mailman.706.1268493031.23598.python-list@python.org>
Message-ID: <60f0beb3-5ad9-4b60-8aa3-b225f3c6cf6b@f8g2000yqn.googlegroups.com>

On Mar 13, 8:10?am, Christian Heimes <li... at cheimes.de> wrote:
> Karjer Jdfjdf wrote:
> > I'm pretty new at programming and want some advice on mixing Jython and Python.
>
> > I want to use Jython to access some Java libraries, but I want to keep developing in normal Python. Some modules I use a lot are not available in Jython.
>
> > The bulk of my programming is in Python but I want to use Java 2D libraries for graphical presentation of data generated in normal Python. Is it possible that I generate data in Python and then pass it through to a Jython program to visualise the data.
>
> You can't mix Jython and Python in one program. But you can use other
> means to create bindings for Java code. JCC
> (http://pypi.python.org/pypi/JCC/2.5.1) is a very powerful code
> generator for CPython.
>
I have not tried it myself but it seems to be possible.
http://jpype.sourceforge.net/



From np.mapn at gmail.com  Sat Mar 13 18:21:38 2010
From: np.mapn at gmail.com (np map)
Date: Sat, 13 Mar 2010 15:21:38 -0800 (PST)
Subject: Clustering and automated configuration & deployment toolkit with 
	Python
Message-ID: <003064f8-e559-41e9-8110-11fad8373d09@y17g2000yqd.googlegroups.com>

I'd like to write an open source clustering (for computation and
general use) and automation of configuration/deployment in Python.
It's main purpose is to be used in academic environments.
It would be something like running numpy/simpy code (and other custom
python code) on a set of machines in a distributed fashion (e.g.
splitting tasks, doing certain bits on some machines, other sub-tasks
on other machines, etc).

The cluster could be used in at least two ways:
- submit code/files via a web interface, monitor the task via the web
interface and download the results from the master node  (user<>web
interface<>master)
- run code directly from another machine on the cluster (as if it were
a subprocess or something like this)


Requirements (so far):
- support the Ubuntu Linux distribution in the initial iteration
- be easy to extend to other OS-es and package managers
- try to be 3.x compatible where dual compatibility is possible (2.x
and 3.x)
- it will support Python 2.5-2.6
- document required changes to the 2.x only code to make it work on
3.x
- make it easy to submit code directly from python scripts to the
cluster (with the right credentials)
- support key based authentication for job submission
- should talk to at least one type of RDBMS to store various types of
data
- the cluster should be able to kill a task on nodes automatically if
it executes for too long or requires too much memory (configurable)
- should be modular (use automation & configuration or just
clustering)


Therefore, I'd like to know a few things:

Is there a clustering toolkit already available for python?

What would the recommended architecture be ?

How should the "user" code interface with the clustering system's
code?

How should the results be stored (at the node and master level)?

Should threading be supported in the tasks?

How should they be returned to the Master node(s)? (polling, submitted
by the nodes, etc)

What libraries should be used for this? (e.g. fabric as a library,
pyro, etc)

Any other suggestions and pieces of advice?

Should Fabric be used in this clustering system for automation? If
not, what else? Would simply using a wrapper written in python for the
'ssh' app be ok?

Would the following architecture be ok?
Master: splits tasks into sub-tasks, sends them to nodes - provided
the node's load isn't greater than a certain percentage, gets results,
stores and provides configuration to nodes, stores results, etc
Node: runs code, applies configuration, submits the results to the
master, etc

If this system actually gets python-level code submission inside, how
should it work?

The reason I posted this set of questions and ideas is that I'd like
this to be as flexible and usable as possible.

Thanks.


From maymunbeyin at gmail.com  Sat Mar 13 19:34:55 2010
From: maymunbeyin at gmail.com (kuru)
Date: Sat, 13 Mar 2010 16:34:55 -0800 (PST)
Subject: Feeding differeent data types to a class instance?
Message-ID: <ac9a5500-6b06-4fee-b483-bab76922b44e@d2g2000yqa.googlegroups.com>

Hi

I have couple classes in the form of

class Vector:
  def __init__(self,x,y,z):
   self.x=x
   self.y=y
   self.z=z

This works fine for me. However I want to be able to provide a list,
tuple as well as individual arguments like below

myvec=Vector(1,2,3)

This works well


However I  also want to be able to do

vect=[1,2,3]

myvec=Vec(vect)

I want this class to accept multiple data types but process them as
they are same when the classs deals with the instances.

thanks




From rhodri at wildebst.demon.co.uk  Sat Mar 13 19:54:40 2010
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Sun, 14 Mar 2010 00:54:40 -0000
Subject: Feeding differeent data types to a class instance?
References: <ac9a5500-6b06-4fee-b483-bab76922b44e@d2g2000yqa.googlegroups.com>
Message-ID: <op.u9i8tepma8ncjz@gnudebst>

On Sun, 14 Mar 2010 00:34:55 -0000, kuru <maymunbeyin at gmail.com> wrote:

> Hi
>
> I have couple classes in the form of
>
> class Vector:
>   def __init__(self,x,y,z):
>    self.x=x
>    self.y=y
>    self.z=z
>
> This works fine for me. However I want to be able to provide a list,
> tuple as well as individual arguments like below
>
> myvec=Vector(1,2,3)
>
> This works well
>
>
> However I  also want to be able to do
>
> vect=[1,2,3]
>
> myvec=Vec(vect)

You can do something like:

class Vector(object):
   def __init__(self, x, y=None, z=None):
     if isinstance(x, list):
       self.x = x[0]
       self.y = x[1]
       self.z = x[2]
     else:
       self.x = x
       self.y = y
       self.z = z

but this gets messy quite quickly.  The usual wisdom these days is to  
write yourself a separate class method to create your object from a  
different type:

class Vector(object):
   ... def __init__ as you did before ...

   @classmethod
   def from_list(cls, lst):
     return cls(lst[0], lst[1], lst[2])

vect = [1,2,3]
myvec = Vector.from_list(vect)


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


From monaghand.david at gmail.com  Sat Mar 13 20:00:16 2010
From: monaghand.david at gmail.com (David Monaghan)
Date: Sun, 14 Mar 2010 01:00:16 +0000
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
	<87fx443vgo.fsf@castleamber.com>
Message-ID: <lpcop5d7qgc7a4qbdqu5jf4r5da1ojkqhj@4ax.com>

On Sat, 13 Mar 2010 12:52:39 -0600, John Bokma <john at castleamber.com> wrote:

>Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
>
>> As the old proverb goes: give a man a fish, and you feed him for a day. 
>> Teach him how to fish, and he has food forever.
>
>True, but you don't teach someone fishing by poking an eye out with a
>fishing rod.
>
>> I'm an old-fashioned kind of guy, and don't like LMGTFY because it is 
>> tiresome and requires Javascript. I prefer:
>
>My reply had little to do with lmgtfy and all to do with hiding it behind
>tinyurl. But even then, why not do what you just did: give a URL to
>google directly.
>
>For quite some time I thought that comp.lang.perl.misc was quite
>unfriendly because of a certain attitude. comp.lang.python was quite a
>refreshment for a while: very newbie friendly, less pissing contests,
>etc. (but way more fanboism). 
>
>Yesterday was a sady day: I finally had to conclude that it was only
>wishful thinking on my part; there is no difference.

There was a time, when the internet was young and most newbies couldn't find
their own backsides with both hands, that your conclusions would be well
placed.That time has long passed: Newsgroups are a long way down the
hierarchy since those times and anyone turning up here nowadays _has_ heard
of Google. If they haven't used it, I don't really consider the gentle
reminder that LMGTFY gives too harsh. If you do, you're too much of a gentle
soul to be on the internet at all; someone might say "Boo" to you at any
moment. Beware.

DaveM


From usenot at geekmail.INVALID  Sat Mar 13 20:01:37 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Sun, 14 Mar 2010 02:01:37 +0100
Subject: building a dict
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
	<3f56c242-7bf5-40c6-96d4-881d052db39a@o30g2000yqb.googlegroups.com>
	<289d7e7f-a068-487e-a918-17a39110d0f7@e1g2000yqh.googlegroups.com>
	<91def698-98ba-4d63-b647-c13467e2a8c0@k17g2000yqb.googlegroups.com>
	<c40c6804-4870-4195-8766-732e10323184@e1g2000yqh.googlegroups.com>
	<0ed22def-8cb9-47ec-8df8-60439810819a@g10g2000yqh.googlegroups.com>
Message-ID: <20100314020137.2bb95011@geekmail.INVALID>

On Sat, 13 Mar 2010 13:42:12 -0800 (PST) vsoler
<vicente.soler at gmail.com> wrote:

> By the way, I suppose I am the OP. Since I am not an native English
> speaking person, I do not know what it stands for. Perhaps you can
> tell me.
> 
Perhaps you can find out yourself:

http://www.urbandictionary.com/define.php?term=op

/W


-- 
INVALID? DE!



From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 13 20:23:46 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 14 Mar 2010 01:23:46 GMT
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
	<hnfmek$o5a$1@speranza.aioe.org>
	<mailman.698.1268477864.23598.python-list@python.org>
	<hnh32u$5j6$2@speranza.aioe.org>
Message-ID: <4b9c3aa2$0$27822$c3e8da3@news.astraweb.com>

On Sun, 14 Mar 2010 11:20:15 +1300, Gib Bogle wrote:

> Mark Lawrence wrote:
>> 
>> I'm certain that members of the Guinea Pig Club might have something to
>> say on that one, see :-
>> http://en.wikipedia.org/wiki/Guinea_Pig_Club
>> 
>> 
> You mean, something like: "That's not funny"?

Or possibly "That's hilarious!!!". Gallows humour is sometimes hard to 
predict.



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 13 20:27:56 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 14 Mar 2010 01:27:56 GMT
Subject: Feeding differeent data types to a class instance?
References: <ac9a5500-6b06-4fee-b483-bab76922b44e@d2g2000yqa.googlegroups.com>
Message-ID: <4b9c3b9c$0$27822$c3e8da3@news.astraweb.com>

On Sat, 13 Mar 2010 16:34:55 -0800, kuru wrote:

> I want this class to accept multiple data types but process them as they
> are same when the classs deals with the instances.

The usual term for this is "polymorphism".

> myvec=Vector(1,2,3)
>
> vect=[1,2,3]
> myvec=Vec(vect)

I assume you mean Vector in the last line.

I find this the easiest way to handle this situation:

class Vector(object, *args):
    if len(args) == 1:
        # Assume the caller passed a list argument.
        args = args[0]
    x, y, z = args  # Unpack the arguments.
    # then process as normal.



-- 
Steven


From jgardner at jonathangardner.net  Sun Mar 14 03:42:31 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Sat, 13 Mar 2010 23:42:31 -0800
Subject: NoSQL Movement?
In-Reply-To: <7xljdx73a9.fsf@ruckus.brouhaha.com>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<mailman.256.1267655008.23598.python-list@python.org>
	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
	<6cc20cea1003120105j626cc519o2271106e088b2e90@mail.gmail.com>
	<mailman.664.1268404115.23598.python-list@python.org>
	<7xljdx73a9.fsf@ruckus.brouhaha.com>
Message-ID: <6cc20cea1003132342s6daefa43m6839a35bff37e0bb@mail.gmail.com>

On Fri, Mar 12, 2010 at 11:23 AM, Paul Rubin <no.email at nospam.invalid> wrote:
> "D'Arcy J.M. Cain" <darcy at druid.net> writes:
>> Just curious, what database were you using that wouldn't keep up with
>> you? ?I use PostgreSQL and would never consider going back to flat
>> files.
>
> Try making a file with a billion or so names and addresses, then
> compare the speed of inserting that many rows into a postgres table
> against the speed of copying the file.
>

Also consider how much work it is to partition data from flat files
versus PostgreSQL tables.

>> The only thing I can think of that might make flat files faster is
>> that flat files are buffered whereas PG guarantees that your
>> information is written to disk before returning
>
> Don't forget all the shadow page operations and the index operations,
> and that a lot of these operations require reading as well as writing
> remote parts of the disk, so buffering doesn't help avoid every disk
> seek.
>

Plus the fact that your other DB operations slow down under the load.

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From ahmeterdinc09 at gmail.com  Sun Mar 14 04:14:49 2010
From: ahmeterdinc09 at gmail.com (ahmet erdinc yilmaz)
Date: Sun, 14 Mar 2010 10:14:49 +0200
Subject: xml-rpc
Message-ID: <4B9C9AF9.80609@gmail.com>

Hello,

Recenetly we are developing a senior project and decide to use xmlrpclib.
However I have some questions. In the documentation I could not find any 
clue about
handling requests? Does the server handles each request in a separate 
thread? Or is
there some queuing mechanism for client calls? Thanks in advance.


--erdinc


From niels.ellegaard at gmail.com  Sun Mar 14 04:36:24 2010
From: niels.ellegaard at gmail.com (Niels L. Ellegaard)
Date: Sun, 14 Mar 2010 09:36:24 +0100
Subject: Some PyCon videos won't play
References: <mailman.709.1268497698.23598.python-list@python.org>
Message-ID: <877hpfwb93.fsf@langager.dbnet.dk>

Lee Harr <missive at hotmail.com> writes:

> I am having a great time watching videos from PyCon. Thanks to
> everyone who presented, and to those who did such a great job
> putting the videos up at: http://pycon.blip.tv/
>
> My trouble is that, although most of the videos play perfectly,
> there are a few that refuse to play at all. Like:

I also had problems playing some of the videos (using gnash), but if you
press "files and links", then you can download the talk as an ogv
file. Furthermore blip.tv provides an rss-feed with ogv-files for
each channel on their site.

http://pycon.blip.tv/rss

Thanks to the pycon people for putting all their nice videos on the web.

        Niels



From bieffe62 at gmail.com  Sun Mar 14 04:51:58 2010
From: bieffe62 at gmail.com (Francesco Bochicchio)
Date: Sun, 14 Mar 2010 00:51:58 -0800 (PST)
Subject: how to start a python script only once
References: <4b9bdd61$0$22515$426a74cc@news.free.fr>
Message-ID: <eb6377d5-4e8b-4d25-b392-7affb76561e4@u9g2000yqb.googlegroups.com>

On 13 Mar, 19:45, News123 <news1... at free.fr> wrote:
> Hi,
>
> I'd like to make sure, that a certain python program will only be run
> once per host. (linux/windows)
>
> so if the program is started a second time it should just terminate and
> let the other one run.
>
> This does not have to be the fastest solution, but it should be reliable.
>
> I have a few ideas, but wonder, which one is the most common
>
> My ideas so far:
>
> pid file and file locking
> --------------------------
> create a file like program.pid ?with the pid of the running program an
> use file locking to avoid race connditions.
>
> However I currently don't know how to do file locking under windows
> and I don't know how to do file lockng with python and linux.
> I'll start googling.
>
> sqlite and locking
> --------------------
> quite some time ago I used a mysql table and locking as an inter-host mutex.
>
> Perhaps sqlite would be good enough for an inter process mutex for
> processes on the same host, but I don't know it well enough.
>
> interprocess mutex
> --------------------
> well I even don't know whether something like this exists on linux / windows
>
> Thanks in advanced for any tips
>
> N

Apart from file, a portable solution would be to bind to an unused
porta and assume that finding the port busy means that your program is
already running on the port.

On recent python installations there is the multiprocessing module
which provides process-level semaphores, but I don't know how portable
they are.

Ciao
----
FB


From breamoreboy at yahoo.co.uk  Sun Mar 14 05:14:15 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Sun, 14 Mar 2010 09:14:15 +0000
Subject: python to exe
In-Reply-To: <hnh32u$5j6$2@speranza.aioe.org>
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>	<87bpes6e4l.fsf@castleamber.com>	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>	<hnfmek$o5a$1@speranza.aioe.org>	<mailman.698.1268477864.23598.python-list@python.org>
	<hnh32u$5j6$2@speranza.aioe.org>
Message-ID: <hni9d8$bu2$1@dough.gmane.org>

Gib Bogle wrote:
> Mark Lawrence wrote:
>>
>> I'm certain that members of the Guinea Pig Club might have something 
>> to say on that one, see :-
>> http://en.wikipedia.org/wiki/Guinea_Pig_Club
>>
> 
> You mean, something like: "That's not funny"?

No, simply a statement.



From breamoreboy at yahoo.co.uk  Sun Mar 14 05:33:17 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Sun, 14 Mar 2010 09:33:17 +0000
Subject: python to exe
In-Reply-To: <4b9c3aa2$0$27822$c3e8da3@news.astraweb.com>
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>	<87bpes6e4l.fsf@castleamber.com>	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>	<hnfmek$o5a$1@speranza.aioe.org>	<mailman.698.1268477864.23598.python-list@python.org>	<hnh32u$5j6$2@speranza.aioe.org>
	<4b9c3aa2$0$27822$c3e8da3@news.astraweb.com>
Message-ID: <hniagu$e2l$1@dough.gmane.org>

Steven D'Aprano wrote:
> On Sun, 14 Mar 2010 11:20:15 +1300, Gib Bogle wrote:
> 
>> Mark Lawrence wrote:
>>> I'm certain that members of the Guinea Pig Club might have something to
>>> say on that one, see :-
>>> http://en.wikipedia.org/wiki/Guinea_Pig_Club
>>>
>>>
>> You mean, something like: "That's not funny"?
> 
> Or possibly "That's hilarious!!!". Gallows humour is sometimes hard to 
> predict.
> 
> 
> 

Thinking about it can be that's not funny or hilarious depending on 
context, which is rather difficult to give on this internet/webby thingy.



From martin.hellwig at dcuktec.org  Sun Mar 14 06:17:54 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Sun, 14 Mar 2010 10:17:54 +0000
Subject: xml-rpc
In-Reply-To: <mailman.721.1268554494.23598.python-list@python.org>
References: <mailman.721.1268554494.23598.python-list@python.org>
Message-ID: <hnid4d$dk$1@news.eternal-september.org>

On 03/14/10 08:14, ahmet erdinc yilmaz wrote:
> Hello,
>
> Recenetly we are developing a senior project and decide to use xmlrpclib.
> However I have some questions. In the documentation I could not find any
> clue about
> handling requests? Does the server handles each request in a separate
> thread? Or is
> there some queuing mechanism for client calls? Thanks in advance.
>
>
> --erdinc

How I usually tackle stuff like this:
[martin at aspire8930 /usr/home/martin]$ python
Python 2.6.4 (r264:75706, Jan 31 2010, 20:52:16)
[GCC 4.2.1 20070719  [FreeBSD]] on freebsd8
Type "help", "copyright", "credits" or "license" for more information.
 >>> import SimpleXMLRPCServer
 >>> help(SimpleXMLRPCServer)
<read it and somewhere at CLASSES it says>
CLASSES
 
BaseHTTPServer.BaseHTTPRequestHandler(SocketServer.StreamRequestHandler)
         SimpleXMLRPCRequestHandler
     SimpleXMLRPCDispatcher
         CGIXMLRPCRequestHandler
         SimpleXMLRPCServer(SocketServer.TCPServer, SimpleXMLRPCDispatcher)
     SocketServer.TCPServer(SocketServer.BaseServer)
         SimpleXMLRPCServer(SocketServer.TCPServer, SimpleXMLRPCDispatcher)

Aah so it is based on SocketServer, lets have a look at that:

 >>> import SocketServer
 >>> help(SocketServer)
Help on module SocketServer:
<reading it and then it says>

     There are five classes in an inheritance diagram, four of which 
represent
     synchronous servers of four types:

             +------------+
             | BaseServer |
             +------------+
                   |
                   v
             +-----------+        +------------------+
             | TCPServer |------->| UnixStreamServer |
             +-----------+        +------------------+
                   |
                   v
             +-----------+        +--------------------+
             | UDPServer |------->| UnixDatagramServer |
             +-----------+        +--------------------+

So the base of all these servers is BaseServer, hmm somebody must have a 
laugh right now :-)

Okay lets have a look at that then:

 >>> import BaseServer
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
ImportError: No module named BaseServer

Hmmm okay, lets have a look at the SocketServer source itself then, but 
where is it?
 >>> SocketServer.__file__
'/usr/local/lib/python2.6/SocketServer.pyc'

I bet that the non compiled file is in the same directory, let's have a 
look at it with less.

 >>> quit()
[martin at aspire8930 /usr/home/martin]$ less 
/usr/local/lib/python2.6/SocketServer.py

And there it says among other interesting stuff:

     # The distinction between handling, getting, processing and
     # finishing a request is fairly arbitrary.  Remember:
     #
     # - handle_request() is the top-level call.  It calls
     #   select, get_request(), verify_request() and process_request()
     # - get_request() is different for stream or datagram sockets
     # - process_request() is the place that may fork a new process
     #   or create a new thread to finish the request
     # - finish_request() instantiates the request handler class;
     #   this constructor will handle the request all by itself

     def handle_request(self):
         """Handle one request, possibly blocking.

         Respects self.timeout.
         """
         # Support people who used socket.settimeout() to escape
         # handle_request before self.timeout was available.
         timeout = self.socket.gettimeout()
         if timeout is None:
             timeout = self.timeout
         elif self.timeout is not None:
             timeout = min(timeout, self.timeout)
         fd_sets = select.select([self], [], [], timeout)
         if not fd_sets[0]:
             self.handle_timeout()
             return
         self._handle_request_noblock()

     def _handle_request_noblock(self):
         """Handle one request, without blocking.

         I assume that select.select has returned that the socket is
         readable before this function was called, so there should be
         no risk of blocking in get_request().
         """
         try:
             request, client_address = self.get_request()
         except socket.error:
             return
         if self.verify_request(request, client_address):
             try:
                 self.process_request(request, client_address)
             except:
                 self.handle_error(request, client_address)
                 self.close_request(request)


I leave the remaining parts of your question as an exercise :-)

-- 
mph


From hackingkk at gmail.com  Sun Mar 14 06:32:30 2010
From: hackingkk at gmail.com (hackingKK)
Date: Sun, 14 Mar 2010 16:02:30 +0530
Subject: xml-rpc
In-Reply-To: <hnid4d$dk$1@news.eternal-september.org>
References: <mailman.721.1268554494.23598.python-list@python.org>
	<hnid4d$dk$1@news.eternal-september.org>
Message-ID: <4B9CBB3E.3090902@gmail.com>

Instead of using the library directly,
isn't python-twisted a better choice?

happy hacking.
Krishnakant.

On Sunday 14 March 2010 03:47 PM, Martin P. Hellwig wrote:
> On 03/14/10 08:14, ahmet erdinc yilmaz wrote:
>> Hello,
>>
>> Recenetly we are developing a senior project and decide to use 
>> xmlrpclib.
>> However I have some questions. In the documentation I could not find any
>> clue about
>> handling requests? Does the server handles each request in a separate
>> thread? Or is
>> there some queuing mechanism for client calls? Thanks in advance.
>>
>>
>> --erdinc
>
> How I usually tackle stuff like this:
> [martin at aspire8930 /usr/home/martin]$ python
> Python 2.6.4 (r264:75706, Jan 31 2010, 20:52:16)
> [GCC 4.2.1 20070719  [FreeBSD]] on freebsd8
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import SimpleXMLRPCServer
> >>> help(SimpleXMLRPCServer)
> <read it and somewhere at CLASSES it says>
> CLASSES
>
> BaseHTTPServer.BaseHTTPRequestHandler(SocketServer.StreamRequestHandler)
>         SimpleXMLRPCRequestHandler
>     SimpleXMLRPCDispatcher
>         CGIXMLRPCRequestHandler
>         SimpleXMLRPCServer(SocketServer.TCPServer, 
> SimpleXMLRPCDispatcher)
>     SocketServer.TCPServer(SocketServer.BaseServer)
>         SimpleXMLRPCServer(SocketServer.TCPServer, 
> SimpleXMLRPCDispatcher)
>
> Aah so it is based on SocketServer, lets have a look at that:
>
> >>> import SocketServer
> >>> help(SocketServer)
> Help on module SocketServer:
> <reading it and then it says>
>
>     There are five classes in an inheritance diagram, four of which 
> represent
>     synchronous servers of four types:
>
>             +------------+
>             | BaseServer |
>             +------------+
>                   |
>                   v
>             +-----------+        +------------------+
>             | TCPServer |------->| UnixStreamServer |
>             +-----------+        +------------------+
>                   |
>                   v
>             +-----------+        +--------------------+
>             | UDPServer |------->| UnixDatagramServer |
>             +-----------+        +--------------------+
>
> So the base of all these servers is BaseServer, hmm somebody must have 
> a laugh right now :-)
>
> Okay lets have a look at that then:
>
> >>> import BaseServer
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> ImportError: No module named BaseServer
>
> Hmmm okay, lets have a look at the SocketServer source itself then, 
> but where is it?
> >>> SocketServer.__file__
> '/usr/local/lib/python2.6/SocketServer.pyc'
>
> I bet that the non compiled file is in the same directory, let's have 
> a look at it with less.
>
> >>> quit()
> [martin at aspire8930 /usr/home/martin]$ less 
> /usr/local/lib/python2.6/SocketServer.py
>
> And there it says among other interesting stuff:
>
>     # The distinction between handling, getting, processing and
>     # finishing a request is fairly arbitrary.  Remember:
>     #
>     # - handle_request() is the top-level call.  It calls
>     #   select, get_request(), verify_request() and process_request()
>     # - get_request() is different for stream or datagram sockets
>     # - process_request() is the place that may fork a new process
>     #   or create a new thread to finish the request
>     # - finish_request() instantiates the request handler class;
>     #   this constructor will handle the request all by itself
>
>     def handle_request(self):
>         """Handle one request, possibly blocking.
>
>         Respects self.timeout.
>         """
>         # Support people who used socket.settimeout() to escape
>         # handle_request before self.timeout was available.
>         timeout = self.socket.gettimeout()
>         if timeout is None:
>             timeout = self.timeout
>         elif self.timeout is not None:
>             timeout = min(timeout, self.timeout)
>         fd_sets = select.select([self], [], [], timeout)
>         if not fd_sets[0]:
>             self.handle_timeout()
>             return
>         self._handle_request_noblock()
>
>     def _handle_request_noblock(self):
>         """Handle one request, without blocking.
>
>         I assume that select.select has returned that the socket is
>         readable before this function was called, so there should be
>         no risk of blocking in get_request().
>         """
>         try:
>             request, client_address = self.get_request()
>         except socket.error:
>             return
>         if self.verify_request(request, client_address):
>             try:
>                 self.process_request(request, client_address)
>             except:
>                 self.handle_error(request, client_address)
>                 self.close_request(request)
>
>
> I leave the remaining parts of your question as an exercise :-)
>



From fetchinson at googlemail.com  Sun Mar 14 06:49:08 2010
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Sun, 14 Mar 2010 11:49:08 +0100
Subject: how to start a python script only once
In-Reply-To: <4b9bdd61$0$22515$426a74cc@news.free.fr>
References: <4b9bdd61$0$22515$426a74cc@news.free.fr>
Message-ID: <fbe2e2101003140349o1ba3de2bi6c671d340a27ea42@mail.gmail.com>

> I'd like to make sure, that a certain python program will only be run
> once per host. (linux/windows)
>
>
> so if the program is started a second time it should just terminate and
> let the other one run.
>
> This does not have to be the fastest solution, but it should be reliable.
>
>
> I have a few ideas, but wonder, which one is the most common
>
>
> My ideas so far:
>
> pid file and file locking
> --------------------------
> create a file like program.pid  with the pid of the running program an
> use file locking to avoid race connditions.
>
> However I currently don't know how to do file locking under windows
> and I don't know how to do file lockng with python and linux.
> I'll start googling.

This is the variant I'm using frequently too and I'd recommend to you as well.
Simple to implement and largely problem-free.

Cheers,
Daniel


-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From martin.hellwig at dcuktec.org  Sun Mar 14 06:50:21 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Sun, 14 Mar 2010 10:50:21 +0000
Subject: xml-rpc
In-Reply-To: <mailman.724.1268562769.23598.python-list@python.org>
References: <mailman.721.1268554494.23598.python-list@python.org>	<hnid4d$dk$1@news.eternal-september.org>
	<mailman.724.1268562769.23598.python-list@python.org>
Message-ID: <hnif17$93u$1@news.eternal-september.org>

On 03/14/10 10:32, hackingKK wrote:
> Instead of using the library directly,
> isn't python-twisted a better choice?
<cut>
Why?

-- 
mph


From spamfresser at ch3ka.de  Sun Mar 14 07:25:35 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Sun, 14 Mar 2010 12:25:35 +0100
Subject: I passed a fizzbuzz test but failed at recursion.
In-Reply-To: <2380120f-c273-4179-af80-ecc8954a6bd3@b7g2000yqd.googlegroups.com>
References: <2380120f-c273-4179-af80-ecc8954a6bd3@b7g2000yqd.googlegroups.com>
Message-ID: <hnih3e$jc2$1@news.urz.uni-heidelberg.de>

Am 10.03.2010 16:55, schrieb Bill:
> def fizzbuzz(num):
>      if num:
>          if num % 15 is 0: return fizzbuzz(num-1) + 'fizzbuzz \n'
>          elif num % 5 is 0: return fizzbuzz(num-1) + 'buzz \n'
>          elif num % 3 is 0: return fizzbuzz(num-1) + 'fizz \n'
>          else : return fizzbuzz(num-1) + ('%d \n' % num)
>      return ''
> print fizzbuzz(100)

While I do understand that this is not a Perl group, and this probably 
won't help the OP, I just could not resist:

for i in range(1,101):print('','fizz')[not i%3]+('','buzz')[not i%5]or i

 > However, when I try to decipher the logic of the function I imagine
 > the solution reversed as "buzz fizz 98 97 ...etc... 4 fizz 2 1".

No, the function creates the string from right to left.
See:
fizzbuzz(100) = fizzbuzz(99) + "buzz \n"
= fizzbuzz(98) + "fizz \n" + "buzz \n"

...

= fizzbuzz(1) + "2 \n" + "fizz \n" + "4 \n" + "buzz\n " + "fizz \n" + 
.... + "97 \n" + "98 \n" + "fizz \n" + "buzz \n"

= fizzbuzz(0) + "1 \n" + "2 \n" + "fizz \n" + "4 \n" + "buzz\n " + "fizz 
\n" + .... + "97 \n" + "98 \n" + "fizz \n" + "buzz \n"

= " " + "1 \n" + "2 \n" + "fizz \n" + "4 \n" + "buzz\n " + "fizz \n" + 
.... + "97 \n" + "98 \n" + "fizz \n" + "buzz \n"

Regards,
Michael


From vicente.soler at gmail.com  Sun Mar 14 07:34:53 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sun, 14 Mar 2010 04:34:53 -0700 (PDT)
Subject: "Breaking" the __main__ script
Message-ID: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com>

Hello,

I am still learning python, thus developnig small scripts.

Some of them consist only of the main module. While testing them
(debugging) I sometimes want to stop the script at a certain point,
with something like    stop, break, end   or something similar.

What statement can I use?

Vicente Soler


From breamoreboy at yahoo.co.uk  Sun Mar 14 07:53:22 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Sun, 14 Mar 2010 11:53:22 +0000
Subject: "Breaking" the __main__ script
In-Reply-To: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com>
Message-ID: <hniine$79f$1@dough.gmane.org>

vsoler wrote:
> Hello,
> 
> I am still learning python, thus developnig small scripts.
> 
> Some of them consist only of the main module. While testing them
> (debugging) I sometimes want to stop the script at a certain point,
> with something like    stop, break, end   or something similar.
> 
> What statement can I use?
> 
> Vicente Soler

Something like
import sys
sys.exit()?

HTH.

Mark Lawrence



From h.stenstrom at gmail.com  Sun Mar 14 07:58:07 2010
From: h.stenstrom at gmail.com (=?ISO-8859-1?Q?Helge_Stenstr=F6m?=)
Date: Sun, 14 Mar 2010 04:58:07 -0700 (PDT)
Subject: Function that knows its argument's variable name
Message-ID: <47e725b6-1470-4563-a64b-02630032ef36@g26g2000yqn.googlegroups.com>

I want to write  function that prints a value of a variable, for
debugging. Like:

with

myVariable = "parrot"
otherVariable = "dead"

probe(myVariable)
probe(otherVariable)

instead of the longer

print "myVariable = ", myVariable
print "otherVariable = ", otherVariable

Is that even possible?

The function would look like

def probe(var):
    nameOfVar = someMagic(var)
    print nameOfVar, " = ", var

but can someMagic(var) find the variable name? Is that possible?


From spamfresser at ch3ka.de  Sun Mar 14 08:20:03 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Sun, 14 Mar 2010 13:20:03 +0100
Subject: "Breaking" the __main__ script
In-Reply-To: <mailman.726.1268567615.23598.python-list@python.org>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com>
	<mailman.726.1268567615.23598.python-list@python.org>
Message-ID: <hnik9k$ju1$1@news.urz.uni-heidelberg.de>

Am 14.03.2010 12:53, schrieb Mark Lawrence:
> vsoler wrote:
>> I sometimes want to stop the script at a certain point,
>> with something like stop, break, end or something similar.
>> What statement can I use?
> Something like
> import sys
> sys.exit()?

Or just "raise SystemExit", "raise SyntaxError" or any other Exception.
But you won't have to: If you use IDLE, you can just set breakpoints in 
your code: enable the debugger in debug-debugger and set breakpoints via 
right click in your source file.

Or you could use a real debugger, like pdb
http://docs.python.org/library/pdb.html

HTH,
Michael


From steve at holdenweb.com  Sun Mar 14 08:36:55 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 14 Mar 2010 08:36:55 -0400
Subject: building a dict
In-Reply-To: <20100314020137.2bb95011@geekmail.INVALID>
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>	<3f56c242-7bf5-40c6-96d4-881d052db39a@o30g2000yqb.googlegroups.com>	<289d7e7f-a068-487e-a918-17a39110d0f7@e1g2000yqh.googlegroups.com>	<91def698-98ba-4d63-b647-c13467e2a8c0@k17g2000yqb.googlegroups.com>	<c40c6804-4870-4195-8766-732e10323184@e1g2000yqh.googlegroups.com>	<0ed22def-8cb9-47ec-8df8-60439810819a@g10g2000yqh.googlegroups.com>
	<20100314020137.2bb95011@geekmail.INVALID>
Message-ID: <hnilao$f86$1@dough.gmane.org>

Andreas Waldenburger wrote:
> On Sat, 13 Mar 2010 13:42:12 -0800 (PST) vsoler
> <vicente.soler at gmail.com> wrote:
> 
>> By the way, I suppose I am the OP. Since I am not an native English
>> speaking person, I do not know what it stands for. Perhaps you can
>> tell me.
>>
> Perhaps you can find out yourself:
> 
> http://www.urbandictionary.com/define.php?term=op
> 
Possibly so, and that's a useful site, but I hope you aren't suggesting
that Vicente shouldn't have asked. It seemed like a perfectly acceptable
question to me.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Sun Mar 14 09:03:53 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 14 Mar 2010 09:03:53 -0400
Subject: Feeding differeent data types to a class instance?
In-Reply-To: <ac9a5500-6b06-4fee-b483-bab76922b44e@d2g2000yqa.googlegroups.com>
References: <ac9a5500-6b06-4fee-b483-bab76922b44e@d2g2000yqa.googlegroups.com>
Message-ID: <hnimtb$kiq$1@dough.gmane.org>

kuru wrote:
> Hi
> 
> I have couple classes in the form of
> 
> class Vector:
>   def __init__(self,x,y,z):
>    self.x=x
>    self.y=y
>    self.z=z
> 
> This works fine for me. However I want to be able to provide a list,
> tuple as well as individual arguments like below
> 
> myvec=Vector(1,2,3)
> 
> This works well
> 
> 
> However I  also want to be able to do
> 
> vect=[1,2,3]
> 
> myvec=Vec(vect)
> 
> I want this class to accept multiple data types but process them as
> they are same when the classs deals with the instances.
> 
> thanks
> 
> 
With your existing class you can use Python's ability to transform a
list or tuple into individual arguments using the * notation:

>>> class Vector:
...   def __init__(self,x,y,z):
...    self.x=x
...    self.y=y
...    self.z=z
...
>>> vl = [1, 2, 3]
>>> v = Vector(*vl)
>>> v.x
1
>>> v.y
2
>>> v.z
3
>>>

Will this do? It seems much simpler than rewriting an already
satisfactory class.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Sun Mar 14 09:07:21 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 14 Mar 2010 09:07:21 -0400
Subject: "Breaking" the __main__ script
In-Reply-To: <hniine$79f$1@dough.gmane.org>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com>
	<hniine$79f$1@dough.gmane.org>
Message-ID: <hnin3r$kiq$2@dough.gmane.org>

Mark Lawrence wrote:
> vsoler wrote:
>> Hello,
>>
>> I am still learning python, thus developnig small scripts.
>>
>> Some of them consist only of the main module. While testing them
>> (debugging) I sometimes want to stop the script at a certain point,
>> with something like    stop, break, end   or something similar.
>>
>> What statement can I use?
>>
>> Vicente Soler
> 
> Something like
> import sys
> sys.exit()?
> 
> HTH.

I think it's less than likely that it will help, since once sys.exit()
is called the program is no longer available for inspection.

The OP is probably looking for the "pdb" module in the standard library.
The documentation is good enough to get you started.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From usenot at geekmail.INVALID  Sun Mar 14 09:28:09 2010
From: usenot at geekmail.INVALID (Andreas Waldenburger)
Date: Sun, 14 Mar 2010 14:28:09 +0100
Subject: building a dict
References: <83cdccc5-9f4d-40fe-93e5-49c0edae8385@g19g2000yqe.googlegroups.com>
	<3f56c242-7bf5-40c6-96d4-881d052db39a@o30g2000yqb.googlegroups.com>
	<289d7e7f-a068-487e-a918-17a39110d0f7@e1g2000yqh.googlegroups.com>
	<91def698-98ba-4d63-b647-c13467e2a8c0@k17g2000yqb.googlegroups.com>
	<c40c6804-4870-4195-8766-732e10323184@e1g2000yqh.googlegroups.com>
	<0ed22def-8cb9-47ec-8df8-60439810819a@g10g2000yqh.googlegroups.com>
	<20100314020137.2bb95011@geekmail.INVALID>
	<mailman.727.1268570289.23598.python-list@python.org>
Message-ID: <20100314142809.5c456262@geekmail.INVALID>

On Sun, 14 Mar 2010 08:36:55 -0400 Steve Holden <steve at holdenweb.com>
wrote:

> Andreas Waldenburger wrote:
> > On Sat, 13 Mar 2010 13:42:12 -0800 (PST) vsoler
> > <vicente.soler at gmail.com> wrote:
> > 
> >> By the way, I suppose I am the OP. Since I am not an native English
> >> speaking person, I do not know what it stands for. Perhaps you can
> >> tell me.
> >>
> > Perhaps you can find out yourself:
> > 
> > http://www.urbandictionary.com/define.php?term=op
> > 
> Possibly so, and that's a useful site, but I hope you aren't
> suggesting that Vicente shouldn't have asked. It seemed like a
> perfectly acceptable question to me.
> 
I was a bit trigger happy there, I admit. But with vocabulary questions
like these, my first reflex is to ask the web rather than people,
because it's usually quicker than Usenet (albeit often only by a minute
or so). I somehow felt the need to bestow that bit of "wisdom" on the
world.

But yeah, the question is fine, of course.

/W

-- 
INVALID? DE!



From darcy at druid.net  Sun Mar 14 09:55:13 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Sun, 14 Mar 2010 09:55:13 -0400
Subject: NoSQL Movement?
In-Reply-To: <6cc20cea1003132342s6daefa43m6839a35bff37e0bb@mail.gmail.com>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<mailman.256.1267655008.23598.python-list@python.org>
	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
	<6cc20cea1003120105j626cc519o2271106e088b2e90@mail.gmail.com>
	<mailman.664.1268404115.23598.python-list@python.org>
	<7xljdx73a9.fsf@ruckus.brouhaha.com>
	<6cc20cea1003132342s6daefa43m6839a35bff37e0bb@mail.gmail.com>
Message-ID: <20100314095513.61b0fbaa.darcy@druid.net>

On Sat, 13 Mar 2010 23:42:31 -0800
Jonathan Gardner <jgardner at jonathangardner.net> wrote:
> On Fri, Mar 12, 2010 at 11:23 AM, Paul Rubin <no.email at nospam.invalid> wrote:
> > "D'Arcy J.M. Cain" <darcy at druid.net> writes:
> >> Just curious, what database were you using that wouldn't keep up with
> >> you? ?I use PostgreSQL and would never consider going back to flat
> >> files.
> >
> > Try making a file with a billion or so names and addresses, then
> > compare the speed of inserting that many rows into a postgres table
> > against the speed of copying the file.

That's a straw man argument.  Copying an already built database to
another copy of the database won't be significantly longer than copying
an already built file.  In fact, it's the same operation.

> Also consider how much work it is to partition data from flat files
> versus PostgreSQL tables.

Another straw man.  I'm sure you can come up with many contrived
examples to show one particular operation faster than another.
Benchmark writers (bad ones) do it all the time.  I'm saying that in
normal, real world situations where you are collecting billions of data
points and need to actually use the data that a properly designed
database running on a good database engine will generally be better than
using flat files.

> >> The only thing I can think of that might make flat files faster is
> >> that flat files are buffered whereas PG guarantees that your
> >> information is written to disk before returning
> >
> > Don't forget all the shadow page operations and the index operations,
> > and that a lot of these operations require reading as well as writing
> > remote parts of the disk, so buffering doesn't help avoid every disk
> > seek.

Not sure what a "shadow page operation" is but index operations are
only needed if you have to have fast access to read back the data.  If
it doesn't matter how long it takes to read the data back then don't
index it.  I have a hard time believing that anyone would want to save
billions of data points and not care how fast they can read selected
parts back or organize the data though.

> Plus the fact that your other DB operations slow down under the load.

Not with the database engines that I use.  Sure, speed and load are
connected whether you use databases or flat files but a proper database
will scale up quite well.

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


From gatoygata2 at gmail.com  Sun Mar 14 10:03:29 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Sun, 14 Mar 2010 07:03:29 -0700 (PDT)
Subject: "Breaking" the __main__ script
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com>
Message-ID: <c1e07a17-b661-4e1a-9dc2-ebbd149d4963@e1g2000yqh.googlegroups.com>

On 14 mar, 12:34, vsoler <vicente.so... at gmail.com> wrote:
> Hello,
>
> I am still learning python, thus developnig small scripts.
>
> Some of them consist only of the main module. While testing them
> (debugging) I sometimes want to stop the script at a certain point,
> with something like ? ?stop, break, end ? or something similar.
>
> What statement can I use?
>
> Vicente Soler

Hola Vicente,

You need a debugger.
A practical solution to start with is to use an IDE with an integrated
debugger.
Stani's Python Editor (SPE) is a lightweight IDE with pdb integrated
(with style checker also).
It is a very good ide for learning (simple and not cluttered) but also
for medium size
applications (it is very well designed).

atb

Joaquin


From steve at holdenweb.com  Sun Mar 14 10:16:43 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 14 Mar 2010 10:16:43 -0400
Subject: NoSQL Movement?
In-Reply-To: <20100314095513.61b0fbaa.darcy@druid.net>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>	<mailman.256.1267655008.23598.python-list@python.org>	<BABjn.11012$pv.4575@news-server.bigpond.net.au>	<6cc20cea1003120105j626cc519o2271106e088b2e90@mail.gmail.com>	<mailman.664.1268404115.23598.python-list@python.org>	<7xljdx73a9.fsf@ruckus.brouhaha.com>	<6cc20cea1003132342s6daefa43m6839a35bff37e0bb@mail.gmail.com>
	<20100314095513.61b0fbaa.darcy@druid.net>
Message-ID: <hnir5u$3og$1@dough.gmane.org>

D'Arcy J.M. Cain wrote:
> On Sat, 13 Mar 2010 23:42:31 -0800
> Jonathan Gardner <jgardner at jonathangardner.net> wrote:
>> On Fri, Mar 12, 2010 at 11:23 AM, Paul Rubin <no.email at nospam.invalid> wrote:
>>> "D'Arcy J.M. Cain" <darcy at druid.net> writes:
>>>> Just curious, what database were you using that wouldn't keep up with
>>>> you?  I use PostgreSQL and would never consider going back to flat
>>>> files.
>>> Try making a file with a billion or so names and addresses, then
>>> compare the speed of inserting that many rows into a postgres table
>>> against the speed of copying the file.
> 
> That's a straw man argument.  Copying an already built database to
> another copy of the database won't be significantly longer than copying
> an already built file.  In fact, it's the same operation.
> 
>> Also consider how much work it is to partition data from flat files
>> versus PostgreSQL tables.
> 
> Another straw man.  I'm sure you can come up with many contrived
> examples to show one particular operation faster than another.
> Benchmark writers (bad ones) do it all the time.  I'm saying that in
> normal, real world situations where you are collecting billions of data
> points and need to actually use the data that a properly designed
> database running on a good database engine will generally be better than
> using flat files.
> 
>>>> The only thing I can think of that might make flat files faster is
>>>> that flat files are buffered whereas PG guarantees that your
>>>> information is written to disk before returning
>>> Don't forget all the shadow page operations and the index operations,
>>> and that a lot of these operations require reading as well as writing
>>> remote parts of the disk, so buffering doesn't help avoid every disk
>>> seek.
> 
> Not sure what a "shadow page operation" is but index operations are
> only needed if you have to have fast access to read back the data.  If
> it doesn't matter how long it takes to read the data back then don't
> index it.  I have a hard time believing that anyone would want to save
> billions of data points and not care how fast they can read selected
> parts back or organize the data though.
> 
>> Plus the fact that your other DB operations slow down under the load.
> 
> Not with the database engines that I use.  Sure, speed and load are
> connected whether you use databases or flat files but a proper database
> will scale up quite well.
> 
A common complaint about large database loads taking a long time comes
about because of trying to commit the whole change as a single
transaction. Such an approach can indeed causes stresses on the database
system, but aren't usually necessary.

I don't know about PostgreSQL's capabilities in this area but I do know
that Oracle (which claims to be all about performance, though in fact I
believe PostgreSQL is its equal in many applications) allows you to
switch off the various time-consuming features such as transaction
logging in order to make bulk updates faster.

I also question how many databases would actually find a need to store
addresses for a sixth of the world's population, but this objection is
made mostly for comic relief: I understand that tables of such a size
are necessary sometimes.

There was a talk at OSCON two years ago by someone who was using
PostgreSQL to process 15 terabytes of medical data. I'm sure he'd have
been interested in suggestions that flat files were the answer to his
problem ...

Another talk a couple of years before that discussed how PostgreSQL was
superior to Oracle in handling a three-terabyte data warehouse (though
it conceded Oracle's superiority in handling the production OLTP system
on which the warehouse was based - but that's four years ago).

  http://images.omniti.net/omniti.com/~jesus/misc/BBPostgres.pdf

Of course if you only need sequential access to the data then the
relational approach may be overkill. I would never argue that relational
is the best approach for all data and all applications, but it's often
better than its less-informed critics realize.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From news1234 at free.fr  Sun Mar 14 10:30:13 2010
From: news1234 at free.fr (News123)
Date: Sun, 14 Mar 2010 15:30:13 +0100
Subject: how to start a python script only once
In-Reply-To: <eb6377d5-4e8b-4d25-b392-7affb76561e4@u9g2000yqb.googlegroups.com>
References: <4b9bdd61$0$22515$426a74cc@news.free.fr>
	<eb6377d5-4e8b-4d25-b392-7affb76561e4@u9g2000yqb.googlegroups.com>
Message-ID: <4b9cf2f5$0$27865$426a34cc@news.free.fr>

Hi Francesco,

Francesco Bochicchio wrote:
> On 13 Mar, 19:45, News123 <news1... at free.fr> wrote:
>> Hi,
>>
>> I'd like to make sure, that a certain python program will only be run
>> once per host. (linux/windows)
>>
>> so if the program is started a second time it should just terminate and
>> let the other one run.
>>
>> This does not have to be the fastest solution, but it should be reliable.
>>
>> I have a few ideas, but wonder, which one is the most common
>>
>> My ideas so far:
>>
>> pid file and file locking
>> --------------------------
>> create a file like program.pid  with the pid of the running program an
>> use file locking to avoid race connditions.
>>
>> However I currently don't know how to do file locking under windows
>> and I don't know how to do file lockng with python and linux.
>> I'll start googling.
>>
>> sqlite and locking
>> --------------------
>> quite some time ago I used a mysql table and locking as an inter-host mutex.
>>
>> Perhaps sqlite would be good enough for an inter process mutex for
>> processes on the same host, but I don't know it well enough.
>>
>> interprocess mutex
>> --------------------
>> well I even don't know whether something like this exists on linux / windows
>>
>> Thanks in advanced for any tips
>>
>> N
> 
> Apart from file, a portable solution would be to bind to an unused
> porta and assume that finding the port busy means that your program is
> already running on the port.
Yes, this should work.
I assume in this case the bind() function would handle the race condition.
> 
> On recent python installations there is the multiprocessing module
> which provides process-level semaphores, but I don't know how portable
> they are.

Yes, there are process level semaphores in multiprocesing, but if I
understood well, they would either require a common parent process or
one process, which were acting as a manager, but then the question would
be how to make sure, that the manager process were started only once. (
bind port? )


From news1234 at free.fr  Sun Mar 14 10:32:09 2010
From: news1234 at free.fr (News123)
Date: Sun, 14 Mar 2010 15:32:09 +0100
Subject: how to start a python script only once
In-Reply-To: <mailman.725.1268563752.23598.python-list@python.org>
References: <4b9bdd61$0$22515$426a74cc@news.free.fr>
	<mailman.725.1268563752.23598.python-list@python.org>
Message-ID: <4b9cf369$0$27865$426a34cc@news.free.fr>

Hi Daniel,

Daniel Fetchinson wrote:
>> I'd like to make sure, that a certain python program will only be run
>> once per host. (linux/windows)
>>
>>
>> so if the program is started a second time it should just terminate and
>> let the other one run.
>>
>> This does not have to be the fastest solution, but it should be reliable.
>>
>>
>> I have a few ideas, but wonder, which one is the most common
>>
>>
>> My ideas so far:
>>
>> pid file and file locking
>> --------------------------
>> create a file like program.pid  with the pid of the running program an
>> use file locking to avoid race connditions.
>>
>> However I currently don't know how to do file locking under windows
>> and I don't know how to do file lockng with python and linux.
>> I'll start googling.
> 
> This is the variant I'm using frequently too and I'd recommend to you as well.
> Simple to implement and largely problem-free.

OK, So I'll just have to look in a piece of code, that performs file
locking for windows AND for linux and I should be fine.

bye

N


From darcy at druid.net  Sun Mar 14 10:48:10 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Sun, 14 Mar 2010 10:48:10 -0400
Subject: NoSQL Movement?
In-Reply-To: <hnir5u$3og$1@dough.gmane.org>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<mailman.256.1267655008.23598.python-list@python.org>
	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
	<6cc20cea1003120105j626cc519o2271106e088b2e90@mail.gmail.com>
	<mailman.664.1268404115.23598.python-list@python.org>
	<7xljdx73a9.fsf@ruckus.brouhaha.com>
	<6cc20cea1003132342s6daefa43m6839a35bff37e0bb@mail.gmail.com>
	<20100314095513.61b0fbaa.darcy@druid.net>
	<hnir5u$3og$1@dough.gmane.org>
Message-ID: <20100314104810.adc0c61a.darcy@druid.net>

On Sun, 14 Mar 2010 10:16:43 -0400
Steve Holden <steve at holdenweb.com> wrote:
> A common complaint about large database loads taking a long time comes
> about because of trying to commit the whole change as a single
> transaction. Such an approach can indeed causes stresses on the database
> system, but aren't usually necessary.

True.

> I don't know about PostgreSQL's capabilities in this area but I do know
> that Oracle (which claims to be all about performance, though in fact I
> believe PostgreSQL is its equal in many applications) allows you to
> switch off the various time-consuming features such as transaction
> logging in order to make bulk updates faster.

Yes, PostgreSQL has a bulk loading option as well.  It's usually useful
when you are copying data from one database into another and need to do
it quickly.

> I also question how many databases would actually find a need to store
> addresses for a sixth of the world's population, but this objection is
> made mostly for comic relief: I understand that tables of such a size
> are necessary sometimes.

How about Microsoft storing it's user base?  Oh wait, they only store
registered users with legitimate copies.  Never mind.

> Of course if you only need sequential access to the data then the
> relational approach may be overkill. I would never argue that relational
> is the best approach for all data and all applications, but it's often
> better than its less-informed critics realize.

As a rule I find that in the real world the larger the dataset the
more likely you need a proper database.  For smaller datasets it
doesn't matter so why not use a DB anyway and be prepared when that
"throwaway" system suddenly becomes your company's core application.

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


From news1234 at free.fr  Sun Mar 14 10:52:06 2010
From: news1234 at free.fr (News123)
Date: Sun, 14 Mar 2010 15:52:06 +0100
Subject: NoSQL Movement?
In-Reply-To: <Xns9D35C3BFCE829duncanbooth@127.0.0.1>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<4b90a1f8$0$1629$742ec2ed@news.sonic.net>
	<0d381135-730a-45e4-9225-9ba2a29b77fe@k2g2000pro.googlegroups.com>
	<Xns9D35C3BFCE829duncanbooth@127.0.0.1>
Message-ID: <4b9cf816$0$20651$426a74cc@news.free.fr>

Hi DUncan,


Duncan Booth wrote:
> Xah Lee <xahlee at gmail.com> wrote:
> 
>> For example, consider, if you are within world's top 100th user of
>> database in terms of database size, such as Google, then it may be
>> that the off-the-shelf tools may be limiting. But how many users
>> really have such massive size of data?
> 
> You've totally missed the point. It isn't the size of the data you have 
> today that matters, it's the size of data you could have in several years' 
> time.
> 
> Maybe today you've got 10 users each with 10 megabytes of data, but you're 
> aspiring to become the next twitter/facebook or whatever. It's a bit late 
> as you approach 100 million users (and a petabyte of data) to discover that 
> your system isn't scalable: scalability needs to be built in from day one.


any project/product has to adapt over time.


Not using SQL just because your 20 user application with 100 data sets
might grow into the worlds biggest database doesn't seem right to me.


I strongly believe in not overengineering a product.

For anything I do I use the most covnenient python library first.
This allows me to have results quicky and to get feedback about the
product ASAP.

Lateron I switch to the more performant versions.


bye


N


From python at bdurham.com  Sun Mar 14 11:03:47 2010
From: python at bdurham.com (python at bdurham.com)
Date: Sun, 14 Mar 2010 11:03:47 -0400
Subject: "Breaking" the __main__ script
In-Reply-To: <hnik9k$ju1$1@news.urz.uni-heidelberg.de>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com><mailman.726.1268567615.23598.python-list@python.org>
	<hnik9k$ju1$1@news.urz.uni-heidelberg.de>
Message-ID: <1268579027.18252.1364740493@webmail.messagingengine.com>

Michael,

> Or you could use a real debugger, like pdb
> http://docs.python.org/library/pdb.html

Any reason you prefer PDB over WinPDB?
http://winpdb.org/

Thanks,
Malcolm


From news1234 at free.fr  Sun Mar 14 11:04:25 2010
From: news1234 at free.fr (News123)
Date: Sun, 14 Mar 2010 16:04:25 +0100
Subject: how to start a python script only once
In-Reply-To: <mailman.725.1268563752.23598.python-list@python.org>
References: <4b9bdd61$0$22515$426a74cc@news.free.fr>
	<mailman.725.1268563752.23598.python-list@python.org>
Message-ID: <4B9CFAF9.1070802@free.fr>

Hi Daniel,


One more question:


Daniel Fetchinson wrote:
>> I'd like to make sure, that a certain python program will only be run
>> once per host. (linux/windows)
>>
>>
>> so if the program is started a second time it should just terminate and
>> let the other one run.
>>
>> This does not have to be the fastest solution, but it should be reliable.
>>
>>
>> I have a few ideas, but wonder, which one is the most common
>>
>>
>> My ideas so far:
>>
>> pid file and file locking
>> --------------------------
>> create a file like program.pid  with the pid of the running program an
>> use file locking to avoid race connditions.
>>
>> However I currently don't know how to do file locking under windows
>> and I don't know how to do file lockng with python and linux.
>> I'll start googling.
> 
> This is the variant I'm using frequently too and I'd recommend to you as well.
> Simple to implement and largely problem-free.
> 
How do you make sure, that pid which is stored in the pid file does
really belong to the correct process and not just to any process, that
has by coincidence the same pid?


bye

N


From news1234 at free.fr  Sun Mar 14 11:04:25 2010
From: news1234 at free.fr (News123)
Date: Sun, 14 Mar 2010 16:04:25 +0100
Subject: how to start a python script only once
In-Reply-To: <mailman.725.1268563752.23598.python-list@python.org>
References: <4b9bdd61$0$22515$426a74cc@news.free.fr>
	<mailman.725.1268563752.23598.python-list@python.org>
Message-ID: <4B9CFAF9.1070802@free.fr>

Hi Daniel,


One more question:


Daniel Fetchinson wrote:
>> I'd like to make sure, that a certain python program will only be run
>> once per host. (linux/windows)
>>
>>
>> so if the program is started a second time it should just terminate and
>> let the other one run.
>>
>> This does not have to be the fastest solution, but it should be reliable.
>>
>>
>> I have a few ideas, but wonder, which one is the most common
>>
>>
>> My ideas so far:
>>
>> pid file and file locking
>> --------------------------
>> create a file like program.pid  with the pid of the running program an
>> use file locking to avoid race connditions.
>>
>> However I currently don't know how to do file locking under windows
>> and I don't know how to do file lockng with python and linux.
>> I'll start googling.
> 
> This is the variant I'm using frequently too and I'd recommend to you as well.
> Simple to implement and largely problem-free.
> 
How do you make sure, that pid which is stored in the pid file does
really belong to the correct process and not just to any process, that
has by coincidence the same pid?


bye

N


From david at boddie.org.uk  Sun Mar 14 11:14:27 2010
From: david at boddie.org.uk (David Boddie)
Date: Sun, 14 Mar 2010 16:14:27 +0100
Subject: Some PyCon videos won't play
References: <SNT106-W28E9678F29E5527CFCBB88B1300@phx.gbl>
	<mailman.716.1268506909.23598.python-list@python.org>
Message-ID: <hniugj$b36$1@get-news01.get.basefarm.net>

On Saturday 13 March 2010 20:01, Terry Reedy wrote:

> On 3/13/2010 11:23 AM, Lee Harr wrote:
>>
>> I am having a great time watching videos from PyCon. Thanks to
>> everyone who presented, and to those who did such a great job
>> putting the videos up at: http://pycon.blip.tv/
>>
>> My trouble is that, although most of the videos play perfectly,
>> there are a few that refuse to play at all. Like:

[...]

>> Is anyone else having trouble with these?
> 
> Yes, 'spinner' spins indefinitely, while others load and play.

You should still be able to get at the videos themselves by inspecting
the page contents, looking for download links like this one:

http://blip.tv/file/get/Pycon-PyCon2010UsingPythonToCreateRoboticSimulationsForPlaneta894.ogv

In this case, it's an Ogg Theora video file, so you may want to use
a player like VLC to view it:

http://www.videolan.org/

David


From wolfgang.lipp at gmail.com  Sun Mar 14 11:57:36 2010
From: wolfgang.lipp at gmail.com (_wolf)
Date: Sun, 14 Mar 2010 08:57:36 -0700 (PDT)
Subject: Is it possible to use re2 from Python?
Message-ID: <f853ea28-b236-4a17-8ded-43e5fe455d47@a18g2000yqc.googlegroups.com>


i just discovered http://code.google.com/p/re2, a promising library
that uses a long-neglected way (Thompson NFA) to implement a regular
expression engine that can be orders of magnitudes faster than the
available engines of awk, Perl, or Python.

so i downloaded the code and did the usual sudo make install thing.
however, that action had seemingly done little more than adding /usr/
local/include/re2/re2.h to my system. there seemed to be some `*.a
file in addition, but then what is it with this *.a extension?

i would like to use re2 from Python (preferrably Python 3.1) and was
excited to see files like make_unicode_groups.py in the distro (maybe
just used during the build process?). those however were not deployed
on my machine.

how can i use re2 from Python?

(this message appeared before under
http://stackoverflow.com/questions/2439345/is-it-possible-to-use-re2-from-python
and, even earlier, http://groups.google.com/group/re2-dev/t/59b78327ec3cca0a)


From gherron at islandtraining.com  Sun Mar 14 12:45:51 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Sun, 14 Mar 2010 09:45:51 -0700
Subject: Function that knows its argument's variable name
In-Reply-To: <47e725b6-1470-4563-a64b-02630032ef36@g26g2000yqn.googlegroups.com>
References: <47e725b6-1470-4563-a64b-02630032ef36@g26g2000yqn.googlegroups.com>
Message-ID: <4B9D12BF.70307@islandtraining.com>

Helge Stenstr?m wrote:
> I want to write  function that prints a value of a variable, for
> debugging. Like:
>
> with
>
> myVariable = "parrot"
> otherVariable = "dead"
>
> probe(myVariable)
> probe(otherVariable)
>
> instead of the longer
>
> print "myVariable = ", myVariable
> print "otherVariable = ", otherVariable
>
> Is that even possible?
>
> The function would look like
>
> def probe(var):
>     nameOfVar = someMagic(var)
>     print nameOfVar, " = ", var
>
> but can someMagic(var) find the variable name? Is that possible?
>   

That question really doesn't  quite make sense.    Consider all the 
ways  such a function can be called:
  someMagic(42)
  someMagic(40+2)
  someMagic(f(123))
  someMagic(*argTuple)
  someMagic(**kwDict)
  someMagic(array[42])
None of which have a variable name associated with the argument.

Yet, the answer to your question is not quite absolutely "no".  Python 
has lots of introspection capabilities, including, perhaps, getting at 
and parsing the original code to find the call.    But there's nothing 
direct for what you want.

Gary Herron


 




From vicente.soler at gmail.com  Sun Mar 14 13:17:48 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sun, 14 Mar 2010 10:17:48 -0700 (PDT)
Subject: iterator/generator
Message-ID: <db51dbb8-920a-405a-8ddc-2a734f7140ac@q21g2000yqm.googlegroups.com>

I am working on a script that reads data from an excel workbook. The
data is located in a named range whose first row contains the headers.
It works!!!  I find it superb that python is able to do such things!!!

Now my questions.

a. My ranges can in practice be quite big, and although I am happy
with the speed I get, because I am learning python, I think I could do
it still a bit better. I think that the line   for i in matriz[1:]:
could be improved with an iterator/generator, but I am not quite
certain how I should proceed.

b. the following lines could be improved by means of a defaultdict,
that I know because of a previous post. However you may come up with
some other ideas (this b. question is not my main concern, you may
discard it if you find the post too long)

        if i[a] and not(i[a] in g) and i[b]:
            g[i[a]] = i[b]
        elif i[a] and (i[a] in g) and i[b]:
            g[i[a]] += i[b]

Can anybody provide some hints?  Thank you for your cooperation.

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
import win32com.client as win32

def agrupar(matriz, c1, c2):
    a, b = matriz[0].index(c1), matriz[0].index(c2)
    g = {}
    for i in matriz[1:]:
        if i[a] and not(i[a] in g) and i[b]:
            g[i[a]] = i[b]
        elif i[a] and (i[a] in g) and i[b]:
            g[i[a]] += i[b]
    for k in g:
        print '%-50s     %15d' % (k, g[k])

# Abrir fichero excel
xl = win32.gencache.EnsureDispatch('Excel.Application')
##xl.Visible = True
wb=xl.Workbooks.Open(r'C:\Users\Vicente\Documents\VS\Python
\Presupuesto fijos 10YP 2011-2020 V0.xls')

# Obtenci?n de datos
datos=wb.Names('Datos').RefersToRange()
print
agrupar(datos, u'NomCC', u'BGT-09')

# Cerrar libro de trabajo
wb.Close()
print


From steve at holdenweb.com  Sun Mar 14 13:49:47 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 14 Mar 2010 13:49:47 -0400
Subject: iterator/generator
In-Reply-To: <db51dbb8-920a-405a-8ddc-2a734f7140ac@q21g2000yqm.googlegroups.com>
References: <db51dbb8-920a-405a-8ddc-2a734f7140ac@q21g2000yqm.googlegroups.com>
Message-ID: <hnj7lh$d05$1@dough.gmane.org>

vsoler wrote:
> I am working on a script that reads data from an excel workbook. The
> data is located in a named range whose first row contains the headers.
> It works!!!  I find it superb that python is able to do such things!!!
> 
> Now my questions.
> 
> a. My ranges can in practice be quite big, and although I am happy
> with the speed I get, because I am learning python, I think I could do
> it still a bit better. I think that the line   for i in matriz[1:]:
> could be improved with an iterator/generator, but I am not quite
> certain how I should proceed.
> 
> b. the following lines could be improved by means of a defaultdict,
> that I know because of a previous post. However you may come up with
> some other ideas (this b. question is not my main concern, you may
> discard it if you find the post too long)
> 
>         if i[a] and not(i[a] in g) and i[b]:
>             g[i[a]] = i[b]
>         elif i[a] and (i[a] in g) and i[b]:
>             g[i[a]] += i[b]
> 
> Can anybody provide some hints?  Thank you for your cooperation.
> 
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> +
> import win32com.client as win32
> 
> def agrupar(matriz, c1, c2):
>     a, b = matriz[0].index(c1), matriz[0].index(c2)
>     g = {}
>     for i in matriz[1:]:
>         if i[a] and not(i[a] in g) and i[b]:
>             g[i[a]] = i[b]
>         elif i[a] and (i[a] in g) and i[b]:
>             g[i[a]] += i[b]
>     for k in g:
>         print '%-50s     %15d' % (k, g[k])
> 
> # Abrir fichero excel
> xl = win32.gencache.EnsureDispatch('Excel.Application')
> ##xl.Visible = True
> wb=xl.Workbooks.Open(r'C:\Users\Vicente\Documents\VS\Python
> \Presupuesto fijos 10YP 2011-2020 V0.xls')
> 
> # Obtenci?n de datos
> datos=wb.Names('Datos').RefersToRange()
> print
> agrupar(datos, u'NomCC', u'BGT-09')
> 
> # Cerrar libro de trabajo
> wb.Close()
> print

Before you go too far down this road (and congratulations, by the way,
on having achieved what you already have!) you might like to consider
the xlrd, xlwt and xlutils modules.

Not only are they easy to use, they are also (I believe) cross-platform
and do not require Excel to be loaded on the machine running the programs.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From maymunbeyin at gmail.com  Sun Mar 14 14:16:50 2010
From: maymunbeyin at gmail.com (kuru)
Date: Sun, 14 Mar 2010 11:16:50 -0700 (PDT)
Subject: Feeding differeent data types to a class instance?
References: <ac9a5500-6b06-4fee-b483-bab76922b44e@d2g2000yqa.googlegroups.com>
	<mailman.728.1268571895.23598.python-list@python.org>
Message-ID: <3189fde6-bd5e-4ee2-8a8e-41c55cf9f926@q23g2000yqd.googlegroups.com>

Hi

Thank you so much for all these great suggestions. I will have time
today to try all these and see which one works best for me

cheers


From kevin.p.dwyer at gmail.com  Sun Mar 14 14:18:45 2010
From: kevin.p.dwyer at gmail.com (Kev Dwyer)
Date: Sun, 14 Mar 2010 18:18:45 +0000 (UTC)
Subject: Is it possible to use re2 from Python?
References: <f853ea28-b236-4a17-8ded-43e5fe455d47@a18g2000yqc.googlegroups.com>
Message-ID: <hnj9a5$mv9$1@dough.gmane.org>

On Sun, 14 Mar 2010 08:57:36 -0700, _wolf wrote:


> 
> how can i use re2 from Python?
> 

Hello Wolf,

There's a recent thread about this on the python-dev list, 
Unfortunately it seems to suggest that there are no Python
bindings at present.

Cheers,

Kev





From CalWhoNOSPAM at roadrunner.com  Sun Mar 14 14:20:55 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Sun, 14 Mar 2010 14:20:55 -0400
Subject: What does Error: 'module' object is not callable Mean?
Message-ID: <hnj9ea$hdi$1@news.eternal-september.org>


The below code produces the error as indicated. But, in
 E:\Python26\Lib\site-packages\ffnet\tools I see:
    drawffnet.py
    drawffnet.pyc
    drawffnet.pyo
Is that what it is looking for?

I'm not sure what "not callable" means.
Could it be referencing to "nn" rather than drawffnet?
What should I do to investigate this?

Thanks
from ffnet import ffnet, mlgraph, readdata

...snipped working code here ...

output, regression = nn.test(inputs2, targets2, iprint = 2)

from ffnet.tools import drawffnet
import pylab
drawffnet(nn)   #Error: 'module' object is not callable
pylab.show()
except ImportError, e:
print "Cannot make drawffnet plot." 




From tartley at tartley.com  Sun Mar 14 14:24:07 2010
From: tartley at tartley.com (Jonathan Hartley)
Date: Sun, 14 Mar 2010 11:24:07 -0700 (PDT)
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com><50697b2c1003122012q3c2530bt79666118bc639b87@mail.gmail.com><4B9B17B3.8000307@cnsp.com>
	<50697b2c1003122047l5b8fa440lc6f1389b58d02df@mail.gmail.com> 
	<mailman.704.1268487914.23598.python-list@python.org>
Message-ID: <78b76065-5fcc-4d00-801c-bed3c8a3a1d7@x12g2000yqx.googlegroups.com>

On Mar 13, 1:45?pm, pyt... at bdurham.com wrote:
> Robin,
>
> > do you of an alternate compilter it doesn't work (py2exe) on my windows 7 box
>
> I can assure you that Py2exe does work on Windows 7 (my firm develops
> commercial Python applications packaged using Py2exe running on Windows
> 7), but it does take a bit of fiddling and some patience. Join the
> py2exe newsgroup and post your problems there.https://lists.sourceforge.net/lists/listinfo/py2exe-users
>
> You may also want to google 'Gui2exe'. This is a free front-end to
> Py2exe that you can use to generate your Py2exe setup.py scripts. Note
> that Gui2exe requires wxPython (free) to run.
>
> Finally, make sure you are trying to compile 32-bit Python 2.x code. I
> don't think py2exe supports Python 3.x or 64-bit versions of Python yet.
>
> > Nope; py2exe is pretty much the go-to tool for this.
>
> I hear great things about PyInstaller. The project is not dead - make
> sure you use the latest version in the SVN.
>
> Search stackoverflow.com for positive feedback and tips on PyInstaller.
> Its on our plate to take a good look this product 'one of these days'.
>
> Good luck!
>
> Malcolm

I summarised a all the alternatives to py2exe I could find, here:
http://spreadsheets.google.com/pub?key=tZ42hjaRunvkObFq0bKxVdg&output=html

Looking for those with a green 'y' in the 'Windows' row, you want to
check out cx_freeze, PyInstaller, bbfreeze.

Best of luck.


From mehgcap at gmail.com  Sun Mar 14 14:26:18 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Sun, 14 Mar 2010 14:26:18 -0400
Subject: problem with variable and function
Message-ID: <bc7f680c1003141126j50bd49aeq1d81511121ef9ed5@mail.gmail.com>

Hi all,
I have a file with a dictionary and a function. The dictionary holds
the name of the function, and the function references the dictionary.
If I put the dictionary first, the function is happy but the
dictionary says the function is not defined. If I switch the two and
put the function first, the function says the dictionary does not
exist. Does anyone have an idea as to how I can make both of them
happy? Thanks!

Example:

myVar={
 1:myFunc
}

def myFunc():
 myOtherVar=myVar

would result in myVar saying myFunc does not exist. Reverse it, though:

def myFunc():
 myOtherVar=myVar

myVar={
 1:myFunc
}

and the function myFunc does not see the dictionary. I basically
cannot win either way, and I need a way to resolve this. If you are
curious, the dictionary holds function names and maps to a second
dictionary of keystrokes, allowing me to map a keystroke to call a
function. Thanks!

-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From python.list at tim.thechases.com  Sun Mar 14 14:30:59 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Sun, 14 Mar 2010 13:30:59 -0500
Subject: "Breaking" the __main__ script
In-Reply-To: <1268579027.18252.1364740493@webmail.messagingengine.com>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com><mailman.726.1268567615.23598.python-list@python.org>	<hnik9k$ju1$1@news.urz.uni-heidelberg.de>
	<1268579027.18252.1364740493@webmail.messagingengine.com>
Message-ID: <4B9D2B63.8030202@tim.thechases.com>

python at bdurham.com wrote:
>> Or you could use a real debugger, like pdb
>> http://docs.python.org/library/pdb.html
> 
> Any reason you prefer PDB over WinPDB?
> http://winpdb.org/

I always count "in the standard library" as a big plus over any 
add-ons  It's nice to know about alternatives such as WinPDB, but 
everybody that has python also has pdb already installed.

-tkc





From apt.shansen at gmail.com  Sun Mar 14 14:33:34 2010
From: apt.shansen at gmail.com (Stephen Hansen)
Date: Sun, 14 Mar 2010 10:33:34 -0800
Subject: What does Error: 'module' object is not callable Mean?
In-Reply-To: <hnj9ea$hdi$1@news.eternal-september.org>
References: <hnj9ea$hdi$1@news.eternal-september.org>
Message-ID: <7a9c25c21003141133x567949b2pf002904e8e22fdf5@mail.gmail.com>

On Sun, Mar 14, 2010 at 10:20 AM, Cal Who <CalWhoNOSPAM at roadrunner.com>wrote:

> from ffnet.tools import drawffnet
> import pylab
> drawffnet(nn)   #Error: 'module' object is not callable


First and foremost, please please please: don't describe or paraphrase
tracebacks when asking for help, show them. The whole thing. It doesn't
-really- matter here, but it still applies.

>
That said, "drawffnet" is a module.

You can't call -- put () on the end of -- a module. Its not a function. Its
a file containing code.

Perhaps you mean drawffnet.drawffnet()?


--S
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From python at bdurham.com  Sun Mar 14 14:36:34 2010
From: python at bdurham.com (python at bdurham.com)
Date: Sun, 14 Mar 2010 14:36:34 -0400
Subject: python to exe
In-Reply-To: <78b76065-5fcc-4d00-801c-bed3c8a3a1d7@x12g2000yqx.googlegroups.com>
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com><50697b2c1003122012q3c2530bt79666118bc639b87@mail.gmail.com><4B9B17B3.8000307@cnsp.com><50697b2c1003122047l5b8fa440lc6f1389b58d02df@mail.gmail.com>
	<mailman.704.1268487914.23598.python-list@python.org>
	<78b76065-5fcc-4d00-801c-bed3c8a3a1d7@x12g2000yqx.googlegroups.com>
Message-ID: <1268591794.10570.1364759429@webmail.messagingengine.com>

Jonathan,

> I summarised a all the alternatives to py2exe I could find, here:
> http://spreadsheets.google.com/pub?key=tZ42hjaRunvkObFq0bKxVdg&output=html

Really great work - thanks for sharing this with all of us!!!

Regards,
Malcolm


From tack at urandom.ca  Sun Mar 14 14:40:55 2010
From: tack at urandom.ca (Jason Tackaberry)
Date: Sun, 14 Mar 2010 14:40:55 -0400
Subject: problem with variable and function
In-Reply-To: <bc7f680c1003141126j50bd49aeq1d81511121ef9ed5@mail.gmail.com>
References: <bc7f680c1003141126j50bd49aeq1d81511121ef9ed5@mail.gmail.com>
Message-ID: <1268592055.14177.499.camel@willow>

Hi Alex,

On Sun, 2010-03-14 at 14:26 -0400, Alex Hall wrote:
> Reverse it, though:
> 
> def myFunc():
>  myOtherVar=myVar
> 
> myVar={
>  1:myFunc
> }
> 
> and the function myFunc does not see the dictionary.

The code you provided works just fine (as one would expect).  If you can
provide an example doesn't work, we should be able to explain why and
provide advice.

Cheers,
Jason.



From tjreedy at udel.edu  Sun Mar 14 14:41:22 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 14 Mar 2010 14:41:22 -0400
Subject: Some PyCon videos won't play
In-Reply-To: <hniugj$b36$1@get-news01.get.basefarm.net>
References: <SNT106-W28E9678F29E5527CFCBB88B1300@phx.gbl>	<mailman.716.1268506909.23598.python-list@python.org>
	<hniugj$b36$1@get-news01.get.basefarm.net>
Message-ID: <hnjakh$mcv$1@dough.gmane.org>

On 3/14/2010 11:14 AM, David Boddie wrote:
> On Saturday 13 March 2010 20:01, Terry Reedy wrote:
>
>> On 3/13/2010 11:23 AM, Lee Harr wrote:
>>>
>>> I am having a great time watching videos from PyCon. Thanks to
>>> everyone who presented, and to those who did such a great job
>>> putting the videos up at: http://pycon.blip.tv/
>>>
>>> My trouble is that, although most of the videos play perfectly,
>>> there are a few that refuse to play at all. Like:
>
> [...]
>
>>> Is anyone else having trouble with these?
>>
>> Yes, 'spinner' spins indefinitely, while others load and play.
>
> You should still be able to get at the videos themselves by inspecting
> the page contents, looking for download links like this one:
>
> http://blip.tv/file/get/Pycon-PyCon2010UsingPythonToCreateRoboticSimulationsForPlaneta894.ogv
>
> In this case, it's an Ogg Theora video file, so you may want to use
> a player like VLC to view it:

For people using html5 competant browsers, which, I believe, play .ogv 
'in tha page', blip.tv just needs to update site to make html5 pages an 
alternative to using the flash player.



From benjamin.kaplan at case.edu  Sun Mar 14 14:41:25 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sun, 14 Mar 2010 14:41:25 -0400
Subject: What does Error: 'module' object is not callable Mean?
In-Reply-To: <hnj9ea$hdi$1@news.eternal-september.org>
References: <hnj9ea$hdi$1@news.eternal-september.org>
Message-ID: <ec96e1391003141141k40c81385v27c5161800d4f9dd@mail.gmail.com>

On Sun, Mar 14, 2010 at 2:20 PM, Cal Who <CalWhoNOSPAM at roadrunner.com>wrote:

>
> The below code produces the error as indicated. But, in
>  E:\Python26\Lib\site-packages\ffnet\tools I see:
>    drawffnet.py
>    drawffnet.pyc
>    drawffnet.pyo
> Is that what it is looking for?
>
> I'm not sure what "not callable" means.
> Could it be referencing to "nn" rather than drawffnet?
> What should I do to investigate this?
>
> Thanks
> from ffnet import ffnet, mlgraph, readdata
>
> ...snipped working code here ...
>
> output, regression = nn.test(inputs2, targets2, iprint = 2)
>
> from ffnet.tools import drawffnet
> import pylab
> drawffnet(nn)   #Error: 'module' object is not callable
> pylab.show()
> except ImportError, e:
> print "Cannot make drawffnet plot."
>
>
In Python, everything is an object. Certain objects, like functions, are
callable. Other objects, like modules are not. You have a module mapped to
the name "drawffnet". Python tries to call that object, but it isn't
callable. If there is a function drawffnet inside the drawffnet module (I'm
not familiar with the package, so I don't know), you need to call that
specifically.

drawffnet.drawffnet(nn)

>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From python at mrabarnett.plus.com  Sun Mar 14 14:46:29 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Sun, 14 Mar 2010 18:46:29 +0000
Subject: What does Error: 'module' object is not callable Mean?
In-Reply-To: <hnj9ea$hdi$1@news.eternal-september.org>
References: <hnj9ea$hdi$1@news.eternal-september.org>
Message-ID: <4B9D2F05.1060101@mrabarnett.plus.com>

  Cal Who wrote:
> The below code produces the error as indicated. But, in
>  E:\Python26\Lib\site-packages\ffnet\tools I see:
>     drawffnet.py
>     drawffnet.pyc
>     drawffnet.pyo
> Is that what it is looking for?
> 
> I'm not sure what "not callable" means.
> Could it be referencing to "nn" rather than drawffnet?
> What should I do to investigate this?
> 
> Thanks
> from ffnet import ffnet, mlgraph, readdata
> 
> ...snipped working code here ...
> 
> output, regression = nn.test(inputs2, targets2, iprint = 2)
> 
> from ffnet.tools import drawffnet
> import pylab
> drawffnet(nn)   #Error: 'module' object is not callable
> pylab.show()
> except ImportError, e:
> print "Cannot make drawffnet plot." 
> 
You're importing the module 'drawffnet' and then trying to call it in:

     drawffnet(nn)

but, as the traceback says, modules can't be called.

I had a quick look at the documentation and it looks like you should be
calling a function called 'drawffnet' that's defined in the module
called 'drawffnet'. Try doing:

     from ffnet.tools.drawffnet import drawffnet

instead.


From tjreedy at udel.edu  Sun Mar 14 14:47:45 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 14 Mar 2010 14:47:45 -0400
Subject: What does Error: 'module' object is not callable Mean?
In-Reply-To: <hnj9ea$hdi$1@news.eternal-september.org>
References: <hnj9ea$hdi$1@news.eternal-september.org>
Message-ID: <hnjb0h$nji$1@dough.gmane.org>

On 3/14/2010 2:20 PM,  Cal Who wrote:
>
> The below code produces the error as indicated. But, in
>   E:\Python26\Lib\site-packages\ffnet\tools I see:
>      drawffnet.py

drawffnet is a module initialized from drawffnet.py (or either of the below)

>      drawffnet.pyc
>      drawffnet.pyo
> Is that what it is looking for?
>
> I'm not sure what "not callable" means.
> Could it be referencing to "nn" rather than drawffnet?
> What should I do to investigate this?
>
> Thanks
> from ffnet import ffnet, mlgraph, readdata
>
> ...snipped working code here ...
>
> output, regression = nn.test(inputs2, targets2, iprint = 2)
>
> from ffnet.tools import drawffnet

here you create drawffnet from one of the files.

> import pylab
> drawffnet(nn)   #Error: 'module' object is not callable

This is an attempt to call the module as if it were a functions, which 
it is not. You probably want to call a function within the module.


> pylab.show()
> except ImportError, e:
> print "Cannot make drawffnet plot."
>
>




From clp2 at rebertia.com  Sun Mar 14 14:48:18 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 14 Mar 2010 10:48:18 -0800
Subject: problem with variable and function
In-Reply-To: <bc7f680c1003141126j50bd49aeq1d81511121ef9ed5@mail.gmail.com>
References: <bc7f680c1003141126j50bd49aeq1d81511121ef9ed5@mail.gmail.com>
Message-ID: <50697b2c1003141148i1704ff81j38e052fc0539619f@mail.gmail.com>

On Sun, Mar 14, 2010 at 10:26 AM, Alex Hall <mehgcap at gmail.com> wrote:
> Hi all,
> I have a file with a dictionary and a function. The dictionary holds
> the name of the function, and the function references the dictionary.
> If I put the dictionary first, the function is happy but the
> dictionary says the function is not defined. If I switch the two and
> put the function first, the function says the dictionary does not
> exist. Does anyone have an idea as to how I can make both of them
> happy?
<snip>
> Reverse it, though:
>
> def myFunc():
> ?myOtherVar=myVar
>
> myVar={
> ?1:myFunc
> }
>
> and the function myFunc does not see the dictionary.

Please be more specific in what you mean by it not "seeing" the
dictionary, because the "reversed" approach *should* work:

$ python
Python 2.6.4 (r264:75706, Feb 25 2010, 01:21:39)
[GCC 4.2.1 (Apple Inc. build 5646) (dot 1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> def foo():
...     bar = baz
...     print bar
...
>>> baz = {1:foo}
>>> foo()
{1: <function foo at 0x37b870>}

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


From CalWho at roadrunner.com  Sun Mar 14 14:57:02 2010
From: CalWho at roadrunner.com (Cal Who)
Date: Sun, 14 Mar 2010 14:57:02 -0400
Subject: What does Error: 'module' object is not callable Mean?
References: <hnj9ea$hdi$1@news.eternal-september.org>
	<7a9c25c21003141133x567949b2pf002904e8e22fdf5@mail.gmail.com>
Message-ID: <379818115B06492999BA94573F720BCB@dad>


  ----- Original Message ----- 
  From: Stephen Hansen 
  To: Cal Who 
  Cc: python-list at python.org 
  Sent: Sunday, March 14, 2010 2:33 PM
  Subject: Re: What does Error: 'module' object is not callable Mean?


  On Sun, Mar 14, 2010 at 10:20 AM, Cal Who <CalWhoNOSPAM at roadrunner.com> wrote:
    from ffnet.tools import drawffnet
    import pylab
    drawffnet(nn)   #Error: 'module' object is not callable


  First and foremost, please please please: don't describe or paraphrase tracebacks when asking for help, show them. The whole thing. It doesn't -really- matter here, but it still applies. 


  I'll keep that in mind but in this instance I simply cut and pasted the message.




  That said, "drawffnet" is a module.


  You can't call -- put () on the end of -- a module. Its not a function. Its a file containing code.


  Perhaps you mean drawffnet.drawffnet()?



  I copied that code from an example and what you suggested fixed it. 
  Thanks.




  --S


------------------------------------------------------------------------------



  No virus found in this incoming message.
  Checked by AVG - www.avg.com 
  Version: 9.0.733 / Virus Database: 271.1.1/2746 - Release Date: 03/14/10 03:33:00
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From john at castleamber.com  Sun Mar 14 15:10:32 2010
From: john at castleamber.com (John Bokma)
Date: Sun, 14 Mar 2010 13:10:32 -0600
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
	<87fx443vgo.fsf@castleamber.com>
	<lpcop5d7qgc7a4qbdqu5jf4r5da1ojkqhj@4ax.com>
Message-ID: <87sk82zplj.fsf@castleamber.com>

David Monaghan <monaghand.david at gmail.com> writes:

> of Google. If they haven't used it, I don't really consider the gentle
> reminder that LMGTFY gives too harsh. If you do, you're too much of a gentle
> soul to be on the internet at all; someone might say "Boo" to you at any
> moment. Beware.

I've no problem with lmgtfy. I *do* have a problem with hiding it behing
a tinyurl. Why use 2 levels of obfuscating in a group that's about
programming in a language that promotes clear coding?

The message would have been the same if the OP had just copy pasted the
Google link. But hey, that's way less "funny".

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From mehgcap at gmail.com  Sun Mar 14 15:12:35 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Sun, 14 Mar 2010 15:12:35 -0400
Subject: problem with variable and function
In-Reply-To: <50697b2c1003141148i1704ff81j38e052fc0539619f@mail.gmail.com>
References: <bc7f680c1003141126j50bd49aeq1d81511121ef9ed5@mail.gmail.com>
	<50697b2c1003141148i1704ff81j38e052fc0539619f@mail.gmail.com>
Message-ID: <bc7f680c1003141212y10c55f05u88d6c81384baead8@mail.gmail.com>

Below is pasted the function which is looking for the "funcs"
dictionary, as well as the dictionary. They appear in my py file in
this order, yet I get an error in nextMode() that "global name 'funcs'
is not defined". Oddly, the keys dictionary works fine; it is defined
above the nextMode function.

def nextMode():
 global HOTKEYS
 global HOTKEY_ACTIONS
 global mode
 global modes
 global modeNum
 global modeNames
 global funcs
 #mode=mode+1
 #check to make sure the newly selected mode is enabled
 tmp=0
 while(tmp<modeNum):
  mode=(mode+1)%modeNum
  if(sys.modules[modeNames[mode]].enabled=='True'):
   break #break on the first enabled mode we find
  #end if
  tmp+=1
 #end while
 HOTKEYS=keys[mode]
 HOTKEY_ACTIONS=funcs[mode]
 registerHotkeys()
 speak("Now in "+str(modes[mode])+" mode.")
#end def

#we now have the default mode to be used, but what if it is disabled?
if(sys.modules[modeNames[mode]].enabled=='False'):
 nextMode()
#end if

funcs=[]
#this dict MUST be defined after all the functions it uses have been
#ARM function dictionary
funcs.append({
  1 : exitProgram,
  2 : arm.sayLoad1,
  3 : arm.sayLoad2,
  4 : arm.sayLoad3,
  5 : arm.sayLoad4,
  6 : arm.sayProcAvg,
  7 : arm.sayUsedRam,
  8 : arm.sayDisk1Info,
  9 : arm.sayDisk2Info,
  10 : nextMode,
  11: clipboard.toClipboard
})

#weather function dictionary
funcs.append({
  1 : exitProgram,
  2 : weather.getCurrent,
  3 : weather.getToday,
  4 : weather.getTomorrow,
  5 : weather.getTwoDays,
  6 : weather.getThreeDays,
  7 : weather.switchLocation,
  8 : arm.sayDisk1Info,
  9 : arm.sayDisk2Info,
  10 : nextMode,
  11 : clipboard.toClipboard
})
funcs.append({
  1 : exitProgram,
  2 : network.speed,
  3 : arm.sayLoad2,
  4 : arm.sayLoad3,
  5 : arm.sayLoad4,
  6 : arm.sayProcAvg,
  7 : arm.sayUsedRam,
  8 : arm.sayDisk1Info,
  9 : arm.sayDisk2Info,
  10 : nextMode,
  11 : clipboard.toClipboard
})


HOTKEY_ACTIONS=funcs[mode]


On 3/14/10, Chris Rebert <clp2 at rebertia.com> wrote:
> On Sun, Mar 14, 2010 at 10:26 AM, Alex Hall <mehgcap at gmail.com> wrote:
>> Hi all,
>> I have a file with a dictionary and a function. The dictionary holds
>> the name of the function, and the function references the dictionary.
>> If I put the dictionary first, the function is happy but the
>> dictionary says the function is not defined. If I switch the two and
>> put the function first, the function says the dictionary does not
>> exist. Does anyone have an idea as to how I can make both of them
>> happy?
> <snip>
>> Reverse it, though:
>>
>> def myFunc():
>> ?myOtherVar=myVar
>>
>> myVar={
>> ?1:myFunc
>> }
>>
>> and the function myFunc does not see the dictionary.
>
> Please be more specific in what you mean by it not "seeing" the
> dictionary, because the "reversed" approach *should* work:
>
> $ python
> Python 2.6.4 (r264:75706, Feb 25 2010, 01:21:39)
> [GCC 4.2.1 (Apple Inc. build 5646) (dot 1)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> def foo():
> ...     bar = baz
> ...     print bar
> ...
>>>> baz = {1:foo}
>>>> foo()
> {1: <function foo at 0x37b870>}
>
> Cheers,
> Chris
> --
> http://blog.rebertia.com
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From clp2 at rebertia.com  Sun Mar 14 15:24:11 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 14 Mar 2010 11:24:11 -0800
Subject: problem with variable and function
In-Reply-To: <bc7f680c1003141212y10c55f05u88d6c81384baead8@mail.gmail.com>
References: <bc7f680c1003141126j50bd49aeq1d81511121ef9ed5@mail.gmail.com>
	<50697b2c1003141148i1704ff81j38e052fc0539619f@mail.gmail.com>
	<bc7f680c1003141212y10c55f05u88d6c81384baead8@mail.gmail.com>
Message-ID: <50697b2c1003141224o2b645404u30fbc80140eec6bc@mail.gmail.com>

> On 3/14/10, Chris Rebert <clp2 at rebertia.com> wrote:
>> On Sun, Mar 14, 2010 at 10:26 AM, Alex Hall <mehgcap at gmail.com> wrote:
>>> Hi all,
>>> I have a file with a dictionary and a function. The dictionary holds
>>> the name of the function, and the function references the dictionary.
>>> If I put the dictionary first, the function is happy but the
>>> dictionary says the function is not defined. If I switch the two and
>>> put the function first, the function says the dictionary does not
>>> exist. Does anyone have an idea as to how I can make both of them
>>> happy?
>> <snip>
>>> Reverse it, though:
>>>
>>> def myFunc():
>>>  myOtherVar=myVar
>>>
>>> myVar={
>>>  1:myFunc
>>> }
>>>
>>> and the function myFunc does not see the dictionary.
>>
>> Please be more specific in what you mean by it not "seeing" the
>> dictionary, because the "reversed" approach *should* work:
>>
>> $ python
>> Python 2.6.4 (r264:75706, Feb 25 2010, 01:21:39)
>> [GCC 4.2.1 (Apple Inc. build 5646) (dot 1)] on darwin
>> Type "help", "copyright", "credits" or "license" for more information.
>>>>> def foo():
>> ...     bar = baz
>> ...     print bar
>> ...
>>>>> baz = {1:foo}
>>>>> foo()
>> {1: <function foo at 0x37b870>}

On Sun, Mar 14, 2010 at 11:12 AM, Alex Hall <mehgcap at gmail.com> wrote:
> Below is pasted the function which is looking for the "funcs"
> dictionary, as well as the dictionary. They appear in my py file in
> this order, yet I get an error in nextMode() that "global name 'funcs'
> is not defined". Oddly, the keys dictionary works fine; it is defined
> above the nextMode function.

Please include the full exception Traceback.
Also, please don't top-post in the future.

> def nextMode():
> ?global HOTKEYS
> ?global HOTKEY_ACTIONS
> ?global mode

You don't need a `global` declaration unless your function needs to
rebind the global variable in question.
So you can remove the next 4 global declarations; they're unnecessary.

> ?global modes
> ?global modeNum
> ?global modeNames
> ?global funcs
> ?#mode=mode+1
> ?#check to make sure the newly selected mode is enabled
> ?tmp=0
> ?while(tmp<modeNum):
> ?mode=(mode+1)%modeNum
> ?if(sys.modules[modeNames[mode]].enabled=='True'):
> ? break #break on the first enabled mode we find
> ?#end if
> ?tmp+=1
> ?#end while
> ?HOTKEYS=keys[mode]
> ?HOTKEY_ACTIONS=funcs[mode]
> ?registerHotkeys()
> ?speak("Now in "+str(modes[mode])+" mode.")
> #end def
>
> #we now have the default mode to be used, but what if it is disabled?
> if(sys.modules[modeNames[mode]].enabled=='False'):
> ?nextMode()

How is this call supposed to work when `funcs` (which nextMode() uses)
hasn't been defined yet?!

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


From yoavglazner at gmail.com  Sun Mar 14 15:30:43 2010
From: yoavglazner at gmail.com (Glazner)
Date: Sun, 14 Mar 2010 12:30:43 -0700 (PDT)
Subject: how to start a python script only once
References: <4b9bdd61$0$22515$426a74cc@news.free.fr>
Message-ID: <c31eefda-4734-4e9b-a743-7837c77f1ae1@m37g2000yqf.googlegroups.com>

On Mar 13, 8:45?pm, News123 <news1... at free.fr> wrote:
> Hi,
>
> I'd like to make sure, that a certain python program will only be run
> once per host. (linux/windows)
>
> so if the program is started a second time it should just terminate and
> let the other one run.
>
> This does not have to be the fastest solution, but it should be reliable.
>
> I have a few ideas, but wonder, which one is the most common
>
> My ideas so far:
>
> pid file and file locking
> --------------------------
> create a file like program.pid ?with the pid of the running program an
> use file locking to avoid race connditions.
>
> However I currently don't know how to do file locking under windows
> and I don't know how to do file lockng with python and linux.
> I'll start googling.
>
> sqlite and locking
> --------------------
> quite some time ago I used a mysql table and locking as an inter-host mutex.
>
> Perhaps sqlite would be good enough for an inter process mutex for
> processes on the same host, but I don't know it well enough.
>
> interprocess mutex
> --------------------
> well I even don't know whether something like this exists on linux / windows
>
> Thanks in advanced for any tips
>
> N

I'll just open a port with a TCP socket, it is cross-platform and free
from race conditions.


From mehgcap at gmail.com  Sun Mar 14 15:34:20 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Sun, 14 Mar 2010 15:34:20 -0400
Subject: problem with variable and function
In-Reply-To: <50697b2c1003141224o2b645404u30fbc80140eec6bc@mail.gmail.com>
References: <bc7f680c1003141126j50bd49aeq1d81511121ef9ed5@mail.gmail.com>
	<50697b2c1003141148i1704ff81j38e052fc0539619f@mail.gmail.com>
	<bc7f680c1003141212y10c55f05u88d6c81384baead8@mail.gmail.com>
	<50697b2c1003141224o2b645404u30fbc80140eec6bc@mail.gmail.com>
Message-ID: <bc7f680c1003141234g2cc68e2al5f1af1e022325398@mail.gmail.com>

>> #we now have the default mode to be used, but what if it is disabled?
>> if(sys.modules[modeNames[mode]].enabled=='False'):
>>  nextMode()
>
>How is this call supposed to work when `funcs` (which nextMode() uses)
>hasn't been defined yet?!

That seems to have done it, thanks. Sorry about top-posting; inline
posting is much harder to read when using a screen reader, as I do, so
I am used to top-posting.


On 3/14/10, Chris Rebert <clp2 at rebertia.com> wrote:
>> On 3/14/10, Chris Rebert <clp2 at rebertia.com> wrote:
>>> On Sun, Mar 14, 2010 at 10:26 AM, Alex Hall <mehgcap at gmail.com> wrote:
>>>> Hi all,
>>>> I have a file with a dictionary and a function. The dictionary holds
>>>> the name of the function, and the function references the dictionary.
>>>> If I put the dictionary first, the function is happy but the
>>>> dictionary says the function is not defined. If I switch the two and
>>>> put the function first, the function says the dictionary does not
>>>> exist. Does anyone have an idea as to how I can make both of them
>>>> happy?
>>> <snip>
>>>> Reverse it, though:
>>>>
>>>> def myFunc():
>>>>  myOtherVar=myVar
>>>>
>>>> myVar={
>>>>  1:myFunc
>>>> }
>>>>
>>>> and the function myFunc does not see the dictionary.
>>>
>>> Please be more specific in what you mean by it not "seeing" the
>>> dictionary, because the "reversed" approach *should* work:
>>>
>>> $ python
>>> Python 2.6.4 (r264:75706, Feb 25 2010, 01:21:39)
>>> [GCC 4.2.1 (Apple Inc. build 5646) (dot 1)] on darwin
>>> Type "help", "copyright", "credits" or "license" for more information.
>>>>>> def foo():
>>> ...     bar = baz
>>> ...     print bar
>>> ...
>>>>>> baz = {1:foo}
>>>>>> foo()
>>> {1: <function foo at 0x37b870>}
>
> On Sun, Mar 14, 2010 at 11:12 AM, Alex Hall <mehgcap at gmail.com> wrote:
>> Below is pasted the function which is looking for the "funcs"
>> dictionary, as well as the dictionary. They appear in my py file in
>> this order, yet I get an error in nextMode() that "global name 'funcs'
>> is not defined". Oddly, the keys dictionary works fine; it is defined
>> above the nextMode function.
>
> Please include the full exception Traceback.
> Also, please don't top-post in the future.
>
>> def nextMode():
>> ?global HOTKEYS
>> ?global HOTKEY_ACTIONS
>> ?global mode
>
> You don't need a `global` declaration unless your function needs to
> rebind the global variable in question.
> So you can remove the next 4 global declarations; they're unnecessary.
>
>> ?global modes
>> ?global modeNum
>> ?global modeNames
>> ?global funcs
>> ?#mode=mode+1
>> ?#check to make sure the newly selected mode is enabled
>> ?tmp=0
>> ?while(tmp<modeNum):
>> ?mode=(mode+1)%modeNum
>> ?if(sys.modules[modeNames[mode]].enabled=='True'):
>> ? break #break on the first enabled mode we find
>> ?#end if
>> ?tmp+=1
>> ?#end while
>> ?HOTKEYS=keys[mode]
>> ?HOTKEY_ACTIONS=funcs[mode]
>> ?registerHotkeys()
>> ?speak("Now in "+str(modes[mode])+" mode.")
>> #end def
>>
>> #we now have the default mode to be used, but what if it is disabled?
>> if(sys.modules[modeNames[mode]].enabled=='False'):
>> ?nextMode()
>
> How is this call supposed to work when `funcs` (which nextMode() uses)
> hasn't been defined yet?!
>
> Cheers,
> Chris
> --
> http://blog.rebertia.com
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From spamfresser at ch3ka.de  Sun Mar 14 15:35:14 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Sun, 14 Mar 2010 20:35:14 +0100
Subject: "Breaking" the __main__ script
In-Reply-To: <mailman.733.1268579034.23598.python-list@python.org>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com><mailman.726.1268567615.23598.python-list@python.org>	<hnik9k$ju1$1@news.urz.uni-heidelberg.de>
	<mailman.733.1268579034.23598.python-list@python.org>
Message-ID: <hnjdpj$nk8$1@news.urz.uni-heidelberg.de>

Am 14.03.2010 16:03, schrieb python at bdurham.com:
> Any reason you prefer PDB over WinPDB?
> http://winpdb.org/

Yes. I don't have Windows except one one PC :P


From sivamadana at gmail.com  Sun Mar 14 16:01:26 2010
From: sivamadana at gmail.com (siva kumar)
Date: Sun, 14 Mar 2010 13:01:26 -0700 (PDT)
Subject: messages
Message-ID: <0273e5a4-2fed-48bb-a7c9-fbd298cd87dd@b36g2000pri.googlegroups.com>

For Good messages please visit

http://messagezonehere.blogspot.com/2010/03/friendly-messages.html


From monaghand.david at gmail.com  Sun Mar 14 16:04:01 2010
From: monaghand.david at gmail.com (David Monaghan)
Date: Sun, 14 Mar 2010 20:04:01 +0000
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
	<87fx443vgo.fsf@castleamber.com>
	<lpcop5d7qgc7a4qbdqu5jf4r5da1ojkqhj@4ax.com>
	<87sk82zplj.fsf@castleamber.com>
Message-ID: <r4gqp5du2f3gamdgkjeul4nag9sr3299v1@4ax.com>

On Sun, 14 Mar 2010 13:10:32 -0600, John Bokma <john at castleamber.com> wrote:

>David Monaghan <monaghand.david at gmail.com> writes:
>
>> of Google. If they haven't used it, I don't really consider the gentle
>> reminder that LMGTFY gives too harsh. If you do, you're too much of a gentle
>> soul to be on the internet at all; someone might say "Boo" to you at any
>> moment. Beware.

Sorry. That last comment of mine was uncalled for.

>I've no problem with lmgtfy. I *do* have a problem with hiding it behing
>a tinyurl. Why use 2 levels of obfuscating in a group that's about
>programming in a language that promotes clear coding?
>
>The message would have been the same if the OP had just copy pasted the
>Google link. But hey, that's way less "funny".

Good point, although one could argue the unhidden response is just rude, but
the masking does make it genuinely funny.

DaveM


From python at bdurham.com  Sun Mar 14 16:08:21 2010
From: python at bdurham.com (python at bdurham.com)
Date: Sun, 14 Mar 2010 16:08:21 -0400
Subject: "Breaking" the __main__ script
In-Reply-To: <hnjdpj$nk8$1@news.urz.uni-heidelberg.de>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com><mailman.726.1268567615.23598.python-list@python.org>
	<hnik9k$ju1$1@news.urz.uni-heidelberg.de><mailman.733.1268579034.23598.python-list@python.org>
	<hnjdpj$nk8$1@news.urz.uni-heidelberg.de>
Message-ID: <1268597301.21932.1364768439@webmail.messagingengine.com>

>> Any reason you prefer PDB over WinPDB?
>> http://winpdb.org/

> Yes. I don't have Windows except one one PC :P

WinPDB runs on non-Windows platforms :)

Malcolm



From ryan at rfk.id.au  Sun Mar 14 16:10:10 2010
From: ryan at rfk.id.au (Ryan Kelly)
Date: Mon, 15 Mar 2010 07:10:10 +1100
Subject: sqlite3 is sqlite 2?
In-Reply-To: <4B99D5C4.8070100@shopzeus.com>
References: <4B99D5C4.8070100@shopzeus.com>
Message-ID: <1268597410.2846.5.camel@durian>

On Fri, 2010-03-12 at 06:48 +0100, Laszlo Nagy wrote:
> gandalf at ubuntu:~$ python
> Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
> [GCC 4.3.3] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>  >>> import sqlite3
>  >>> sqlite3.version
> '2.4.1'
> 
> Is it possible to install a real sqlite version 3 somehow? I really need 
> it because I have to use savepoint/rollback to. That is only supported 
> from sqlite 3.6.8. Is it enough if I upgrade to Ubuntu Karmic? I know 
> that is not a question about Python itself.

That's the sqlite *bindings* version:

  >>> sqlite3.version
  '2.4.1'
  >>> sqlite3.sqlite_version
  '3.6.16'
  >>>

So this is "pysqlite" version 2.4.1, which wraps sqlite version 3.6.16.

Cheers,

  Ryan


-- 
Ryan Kelly
http://www.rfk.id.au  |  This message is digitally signed. Please visit
ryan at rfk.id.au        |  http://www.rfk.id.au/ramblings/gpg/ for details

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From john at castleamber.com  Sun Mar 14 16:11:18 2010
From: john at castleamber.com (John Bokma)
Date: Sun, 14 Mar 2010 14:11:18 -0600
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
	<87fx443vgo.fsf@castleamber.com>
	<lpcop5d7qgc7a4qbdqu5jf4r5da1ojkqhj@4ax.com>
	<87sk82zplj.fsf@castleamber.com>
	<r4gqp5du2f3gamdgkjeul4nag9sr3299v1@4ax.com>
Message-ID: <87fx42zms9.fsf@castleamber.com>

David Monaghan <monaghand.david at gmail.com> writes:

> On Sun, 14 Mar 2010 13:10:32 -0600, John Bokma <john at castleamber.com> wrote:
>
>>David Monaghan <monaghand.david at gmail.com> writes:
>>
>>> of Google. If they haven't used it, I don't really consider the gentle
>>> reminder that LMGTFY gives too harsh. If you do, you're too much of a gentle
>>> soul to be on the internet at all; someone might say "Boo" to you at any
>>> moment. Beware.
>
> Sorry. That last comment of mine was uncalled for.

Thanks.

>>I've no problem with lmgtfy. I *do* have a problem with hiding it behing
>>a tinyurl. Why use 2 levels of obfuscating in a group that's about
>>programming in a language that promotes clear coding?
>>
>>The message would have been the same if the OP had just copy pasted the
>>Google link. But hey, that's way less "funny".
>
> Good point, although one could argue the unhidden response is just rude, but
> the masking does make it genuinely funny.

One could argue, sure. But to me it's just the same as posting GFY
(don't want to upset the tender soulds again with "the F-word".

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From gatoygata2 at gmail.com  Sun Mar 14 16:11:29 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Sun, 14 Mar 2010 13:11:29 -0700 (PDT)
Subject: "Breaking" the __main__ script
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com><mailman.726.1268567615.23598.python-list@python.org>
	<hnik9k$ju1$1@news.urz.uni-heidelberg.de>
	<mailman.733.1268579034.23598.python-list@python.org> 
	<hnjdpj$nk8$1@news.urz.uni-heidelberg.de>
Message-ID: <7608c2b5-c7e2-4002-aacd-b4a53c487e54@q23g2000yqd.googlegroups.com>

On 14 mar, 20:35, Michael Rudolf <spamfres... at ch3ka.de> wrote:
> Am 14.03.2010 16:03, schrieb pyt... at bdurham.com:
>
> > Any reason you prefer PDB over WinPDB?
> >http://winpdb.org/
>
> Yes. I don't have Windows except one one PC :P

WinPdb is crossplatform. Is build with


From john at castleamber.com  Sun Mar 14 16:14:32 2010
From: john at castleamber.com (John Bokma)
Date: Sun, 14 Mar 2010 14:14:32 -0600
Subject: sqlite3 is sqlite 2?
References: <mailman.752.1268596146.23598.python-list@python.org>
Message-ID: <87bpeqzmmv.fsf@castleamber.com>

Laszlo Nagy <gandalf at shopzeus.com> writes:

> gandalf at ubuntu:~$ python
> Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
> [GCC 4.3.3] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import sqlite3
>>>> sqlite3.version
> '2.4.1'
>
> Is it possible to install a real sqlite version 3 somehow? I really
> need it because I have to use savepoint/rollback to. That is only
> supported from sqlite 3.6.8. Is it enough if I upgrade to Ubuntu
> Karmic? I know that is not a question about Python itself.
>
> But still, it is interesting that a module named "sqlite3" can
> actually be used for something called "sqlite 2".

You're mistaking the *module* version with the version of the database,
unless I am mistaken.

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From gatoygata2 at gmail.com  Sun Mar 14 16:18:19 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Sun, 14 Mar 2010 13:18:19 -0700 (PDT)
Subject: "Breaking" the __main__ script
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com><mailman.726.1268567615.23598.python-list@python.org>
	<hnik9k$ju1$1@news.urz.uni-heidelberg.de>
	<mailman.733.1268579034.23598.python-list@python.org> 
	<hnjdpj$nk8$1@news.urz.uni-heidelberg.de>
Message-ID: <6e5a7393-1ec5-4b60-894b-8574be2fe010@30g2000yqi.googlegroups.com>

On 14 mar, 20:35, Michael Rudolf <spamfres... at ch3ka.de> wrote:
> Am 14.03.2010 16:03, schrieb pyt... at bdurham.com:
>
> > Any reason you prefer PDB over WinPDB?
> >http://winpdb.org/
>
> Yes. I don't have Windows except one one PC :P

Sorry, i hit the wrong key. Again:
winpdb is crossplatform. It uses a wxwindows gui.
Names are not really fortunate...
I have installed the last winpdb 1.4.6 in SPE today.

atb
joaquin


From spamfresser at ch3ka.de  Sun Mar 14 16:32:30 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Sun, 14 Mar 2010 21:32:30 +0100
Subject: "Breaking" the __main__ script
In-Reply-To: <mailman.753.1268597303.23598.python-list@python.org>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com><mailman.726.1268567615.23598.python-list@python.org>	<hnik9k$ju1$1@news.urz.uni-heidelberg.de><mailman.733.1268579034.23598.python-list@python.org>	<hnjdpj$nk8$1@news.urz.uni-heidelberg.de>
	<mailman.753.1268597303.23598.python-list@python.org>
Message-ID: <hnjh4v$o6g$1@news.urz.uni-heidelberg.de>

Am 14.03.2010 21:08, schrieb python at bdurham.com:
>>> Any reason you prefer PDB over WinPDB?
>>> http://winpdb.org/
>> Yes. I don't have Windows except one one PC :P
> WinPDB runs on non-Windows platforms :)
Uh, OK.
Then the name mislead me ;)

But yeah, I prefer a console based debugger.


From guillermo.listas at googlemail.com  Sun Mar 14 16:40:09 2010
From: guillermo.listas at googlemail.com (Guillermo)
Date: Sun, 14 Mar 2010 13:40:09 -0700 (PDT)
Subject: Python unicode and Windows cmd.exe
Message-ID: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>

Hi,

I would appreciate if someone could point out what am I doing wrong
here.

Basically, I need to save a string containing non-ascii characters to
a file encoded in utf-8.

If I stay in python, everything seems to work fine, but the moment I
try to read the file with another Windows program, everything goes to
hell.

So here's the script unicode2file.py:
===================================================================
# encoding=utf-8
import codecs

f = codecs.open("m.txt",mode="w", encoding="utf8")
a = u"ma?ana"
print repr(a)
f.write(a)
f.close()

f = codecs.open("m.txt", mode="r", encoding="utf8")
a = f.read()
print repr(a)
f.close()
===================================================================

That gives the expected output, both calls to repr() yield the same
result.

But now, if I do type me.txt in cmd.exe, I get garbled characters
instead of "?".

I then open the file with my editor (Sublime Text), and I see "ma?ana"
normally. I save (nothing to be saved, really), go back to the dos
prompt, do type m.txt and I get again the same garbled characters.

I then open the file m.txt with notepad, and I see "ma?ana" normally.
I save (again, no actual modifications), go back to the dos prompt, do
type m.txt and this time it works! I get "ma?ana". When notepad opens
the file, the encoding is already UTF-8, so short of a UTF-8 bom being
added to the file, I don't know what happens when I save the
unmodified file. Also, I would think that the python script should
save a valid utf-8 file in the first place...

What's going on here?

Regards,
Guillermo


From vlastimil.brom at gmail.com  Sun Mar 14 16:49:56 2010
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Sun, 14 Mar 2010 21:49:56 +0100
Subject: Is it possible to use re2 from Python?
In-Reply-To: <f853ea28-b236-4a17-8ded-43e5fe455d47@a18g2000yqc.googlegroups.com>
References: <f853ea28-b236-4a17-8ded-43e5fe455d47@a18g2000yqc.googlegroups.com>
Message-ID: <9fdb569a1003141349u6f5eee8fk536cb48f139898c7@mail.gmail.com>

2010/3/14 _wolf <wolfgang.lipp at gmail.com>:
>...
> i would like to use re2 from Python (preferrably Python 3.1) and was
> excited to see files like make_unicode_groups.py in the distro (maybe
> just used during the build process?). those however were not deployed
> on my machine.
>...
>

If you would need a re engine with features like unicode rangees,
script, and character properties classes and many others, you may try
the proposed implementation of the re library currently available in
python issue tracker:
http://bugs.python.org/issue2636
I am personally more than satisfied with this development version
sofar, however, as some new feature like unlimited lookarounds etc.
suggest, it is a classic backtracking engine (as opposed to re2, if
you need this very implementation).

hth
  vbr


From steve at holdenweb.com  Sun Mar 14 16:55:20 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 14 Mar 2010 16:55:20 -0400
Subject: "Breaking" the __main__ script
In-Reply-To: <1268597301.21932.1364768439@webmail.messagingengine.com>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com><mailman.726.1268567615.23598.python-list@python.org>	<hnik9k$ju1$1@news.urz.uni-heidelberg.de><mailman.733.1268579034.23598.python-list@python.org>	<hnjdpj$nk8$1@news.urz.uni-heidelberg.de>
	<1268597301.21932.1364768439@webmail.messagingengine.com>
Message-ID: <hnjihi$eur$1@dough.gmane.org>

python at bdurham.com wrote:
>>> Any reason you prefer PDB over WinPDB?
>>> http://winpdb.org/
> 
>> Yes. I don't have Windows except one one PC :P
> 
> WinPDB runs on non-Windows platforms :)
> 
One might reasonably argue that it has a pretty couter-intuitive name, then.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From CalWhoNOSPAM at roadrunner.com  Sun Mar 14 16:58:54 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Sun, 14 Mar 2010 16:58:54 -0400
Subject: What does Error: 'module' object is not callable Mean?
References: <hnj9ea$hdi$1@news.eternal-september.org>
Message-ID: <hnjimh$je1$1@news.eternal-september.org>

Thanks for the replies.
That fixed it but produced another problem.

There are two plotting routines below.
Either one will work without error.
But the combo produces:
The exception unknown software exception (0x40000015) occurred in the 
application at location 0x1e05b62a.
in a dialog box and the following in the console
Fatal Python error: PyEval_RestoreThread: NULL tstate


This application has requested the Runtime to terminate it in an unusual 
way.

Please contact the application's support team for more information.

Do you see what isa wrong?

Second question: Is it common to group all the "from" statements at the top 
of the program
or to put them by the relavent code as I have here?

Thanks a lot


try:

#Or we can use the two commented statements

#from ffnet.tools import drawffnet

from ffnet.tools.drawffnet import drawffnet

import pylab

#drawffnet.drawffnet(nn)

drawffnet(nn)

pylab.show()

except ImportError, e:

print "Cannot make drawffnet plot.\n%s" % e


?

?

# Plot adapted from

# http://ffnet.sourceforge.net/examples/stock.html

# Make plot if matplotlib is avialble

try:

from pylab import *

plot( targets2, 'b--' )

plot( output, 'k-' )

legend(('target', 'output'))

xlabel('pattern'); ylabel('benign or malignant')

title('Outputs vs. target of trained network.')

grid(True)

show()

except ImportError, e:

print "Cannot make plots. For plotting install matplotlib.\n%s" % e



?

?




From CalWhoNOSPAM at roadrunner.com  Sun Mar 14 17:00:37 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Sun, 14 Mar 2010 17:00:37 -0400
Subject: What does Error: 'module' object is not callable Mean?
References: <hnj9ea$hdi$1@news.eternal-september.org>
	<mailman.745.1268592389.23598.python-list@python.org>
Message-ID: <hnjipo$kcf$1@news.eternal-september.org>


"MRAB" <python at mrabarnett.plus.com> wrote in message 
news:mailman.745.1268592389.23598.python-list at python.org...
>  Cal Who wrote:
>> The below code produces the error as indicated. But, in
>>  E:\Python26\Lib\site-packages\ffnet\tools I see:
>>     drawffnet.py
>>     drawffnet.pyc
>>     drawffnet.pyo
>> Is that what it is looking for?
>>
>> I'm not sure what "not callable" means.
>> Could it be referencing to "nn" rather than drawffnet?
>> What should I do to investigate this?
>>
>> Thanks
>> from ffnet import ffnet, mlgraph, readdata
>>
>> ...snipped working code here ...
>>
>> output, regression = nn.test(inputs2, targets2, iprint = 2)
>>
>> from ffnet.tools import drawffnet
>> import pylab
>> drawffnet(nn)   #Error: 'module' object is not callable
>> pylab.show()
>> except ImportError, e:
>> print "Cannot make drawffnet plot."
> You're importing the module 'drawffnet' and then trying to call it in:
>
>     drawffnet(nn)
>
> but, as the traceback says, modules can't be called.
>
> I had a quick look at the documentation and it looks like you should be
> calling a function called 'drawffnet' that's defined in the module
> called 'drawffnet'. Try doing:
>
>     from ffnet.tools.drawffnet import drawffnet
>
> instead.

Thanks, Works great - please see my other post 




From CalWhoNOSPAM at roadrunner.com  Sun Mar 14 17:01:46 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Sun, 14 Mar 2010 17:01:46 -0400
Subject: What does Error: 'module' object is not callable Mean?
References: <hnj9ea$hdi$1@news.eternal-september.org>
	<mailman.746.1268592481.23598.python-list@python.org>
Message-ID: <hnjirt$kvt$1@news.eternal-september.org>


"Terry Reedy" <tjreedy at udel.edu> wrote in message 
news:mailman.746.1268592481.23598.python-list at python.org...
> On 3/14/2010 2:20 PM,  Cal Who wrote:
>>
>> The below code produces the error as indicated. But, in
>>   E:\Python26\Lib\site-packages\ffnet\tools I see:
>>      drawffnet.py
>
> drawffnet is a module initialized from drawffnet.py (or either of the 
> below)
>
>>      drawffnet.pyc
>>      drawffnet.pyo
>> Is that what it is looking for?
>>
>> I'm not sure what "not callable" means.
>> Could it be referencing to "nn" rather than drawffnet?
>> What should I do to investigate this?
>>
>> Thanks
>> from ffnet import ffnet, mlgraph, readdata
>>
>> ...snipped working code here ...
>>
>> output, regression = nn.test(inputs2, targets2, iprint = 2)
>>
>> from ffnet.tools import drawffnet
>
> here you create drawffnet from one of the files.
>
>> import pylab
>> drawffnet(nn)   #Error: 'module' object is not callable
>
> This is an attempt to call the module as if it were a functions, which it 
> is not. You probably want to call a function within the module.
Exactly. Thanks it works now. Please see my other post.

>
>
>> pylab.show()
>> except ImportError, e:
>> print "Cannot make drawffnet plot."
>>
>>
>
> 




From ryan at rfk.id.au  Sun Mar 14 17:04:18 2010
From: ryan at rfk.id.au (Ryan Kelly)
Date: Mon, 15 Mar 2010 08:04:18 +1100
Subject: sqlite savepoint problem (was: Re: sqlite3 is sqlite 2?)
In-Reply-To: <4B99E358.4020507@shopzeus.com>
References: <mailman.752.1268596146.23598.python-list@python.org>
	<87bpeqzmmv.fsf@castleamber.com>  <4B99E358.4020507@shopzeus.com>
Message-ID: <1268600658.2846.17.camel@durian>

On Fri, 2010-03-12 at 07:46 +0100, Laszlo Nagy wrote:
> >
>  >>> import sqlite3
>  >>> conn = sqlite3.connect(':memory:')
>  >>> with conn:
> ...     conn.execute("BEGIN")
> ...     conn.execute("create table a ( i integer)")
> ...     conn.execute("insert into a values (1)")
> ...     conn.execute("savepoint sp1")
> ...     conn.execute("insert into a values(2)")
> ...     conn.execute("release sp1")
> ...     conn.execute("COMMIT")
> ...
> <sqlite3.Cursor object at 0xb7e29b30>
> <sqlite3.Cursor object at 0xb7e29b60>
> <sqlite3.Cursor object at 0xb7e29b30>
> <sqlite3.Cursor object at 0xb7e29b60>
> <sqlite3.Cursor object at 0xb7e29b30>
> Traceback (most recent call last):
>   File "<stdin>", line 7, in <module>
> sqlite3.OperationalError: no such savepoint: sp1
>  >>>
>
> The syntax is correct: http://www.sqlite.org/lang_savepoint.html
> The savepoint was really created.
> But I get this error, telling "no such savepoint". What is wrong here? 
> Maybe it has to do something with transaction isolation? :-s

From memory you can't issue a "CREATE TABLE" statement inside a
transaction, at least not at the default isolation level.  Such a
statement will automatically commit the current transaction.  Doesn't
help with your current problem but worth pointing out :-)

When debugging strange transaction behaviour, I find it easiest to
create the connection with isolation_level=None so that are no implicit
transactions being created behind your back.  Not sure why, but setting
this makes your example work for me.

  Ryan




-- 
Ryan Kelly
http://www.rfk.id.au  |  This message is digitally signed. Please visit
ryan at rfk.id.au        |  http://www.rfk.id.au/ramblings/gpg/ for details

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From nyamatongwe+thunder at gmail.com  Sun Mar 14 17:05:59 2010
From: nyamatongwe+thunder at gmail.com (Neil Hodgson)
Date: Sun, 14 Mar 2010 21:05:59 GMT
Subject: Python unicode and Windows cmd.exe
In-Reply-To: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>
References: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>
Message-ID: <Xccnn.13044$pv.137@news-server.bigpond.net.au>

Guillermo:

> I then open the file m.txt with notepad, and I see "ma?ana" normally.
> I save (again, no actual modifications), go back to the dos prompt, do
> type m.txt and this time it works! I get "ma?ana". When notepad opens
> the file, the encoding is already UTF-8, so short of a UTF-8 bom being
> added to the file, 

   That is what happens: the file now starts with a BOM \xEB\xBB\xBF as
you can see with a hex editor.

> I don't know what happens when I save the
> unmodified file. Also, I would think that the python script should
> save a valid utf-8 file in the first place...

   Its just as valid UTF-8 without a BOM. People have different opinions
on this but for compatibility, I think it is best to always start UTF-8
files with a BOM.

   Neil


From clp2 at rebertia.com  Sun Mar 14 17:17:55 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 14 Mar 2010 13:17:55 -0800
Subject: What does Error: 'module' object is not callable Mean?
In-Reply-To: <hnjimh$je1$1@news.eternal-september.org>
References: <hnj9ea$hdi$1@news.eternal-september.org>
	<hnjimh$je1$1@news.eternal-september.org>
Message-ID: <50697b2c1003141417q37a0c0dfga6ff3955eb0e42f1@mail.gmail.com>

On Sun, Mar 14, 2010 at 12:58 PM, Cal Who <CalWhoNOSPAM at roadrunner.com> wrote:
<snip>
> Second question: Is it common to group all the "from" statements at the top
> of the program
> or to put them by the relavent code as I have here?

The former.

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


From tjreedy at udel.edu  Sun Mar 14 17:19:33 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 14 Mar 2010 17:19:33 -0400
Subject: Some PyCon videos won't play
In-Reply-To: <hnjakh$mcv$1@dough.gmane.org>
References: <SNT106-W28E9678F29E5527CFCBB88B1300@phx.gbl>	<mailman.716.1268506909.23598.python-list@python.org>	<hniugj$b36$1@get-news01.get.basefarm.net>
	<hnjakh$mcv$1@dough.gmane.org>
Message-ID: <hnjjt5$jsk$1@dough.gmane.org>

On 3/14/2010 2:41 PM, Terry Reedy wrote:
> On 3/14/2010 11:14 AM, David Boddie wrote:

>> You should still be able to get at the videos themselves by inspecting
>> the page contents, looking for download links like this one:
>>
>> http://blip.tv/file/get/Pycon-PyCon2010UsingPythonToCreateRoboticSimulationsForPlaneta894.ogv
>>
>>
>> In this case, it's an Ogg Theora video file, so you may want to use
>> a player like VLC to view it:
>
> For people using html5 competant browsers, which, I believe, play .ogv
> 'in tha page', blip.tv just needs to update site to make html5 pages an
> alternative to using the flash player.

Actually, for FF3.6, at least, the problem is already solved. I just 
click on the download button and FF recognizes .ogv as something it can 
play and it does, replacing the flash player. The FF player lacks a 
full-screen button, but that is rarely needed for the talks.

tjr





From cmpython at gmail.com  Sun Mar 14 17:22:22 2010
From: cmpython at gmail.com (CM)
Date: Sun, 14 Mar 2010 14:22:22 -0700 (PDT)
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com> 
	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com> 
	<87fx443vgo.fsf@castleamber.com>
	<lpcop5d7qgc7a4qbdqu5jf4r5da1ojkqhj@4ax.com> 
	<87sk82zplj.fsf@castleamber.com>
	<r4gqp5du2f3gamdgkjeul4nag9sr3299v1@4ax.com>
Message-ID: <806f8246-3b3e-4468-b0e4-3c3f032a6f49@z4g2000yqa.googlegroups.com>

On Mar 14, 4:04?pm, David Monaghan <monaghand.da... at gmail.com> wrote:
> On Sun, 14 Mar 2010 13:10:32 -0600, John Bokma <j... at castleamber.com> wrote:
> >David Monaghan <monaghand.da... at gmail.com> writes:
>
> >> of Google. If they haven't used it, I don't really consider the gentle
> >> reminder that LMGTFY gives too harsh. If you do, you're too much of a gentle
> >> soul to be on the internet at all; someone might say "Boo" to you at any
> >> moment. Beware.
>
> Sorry. That last comment of mine was uncalled for.
>
> >I've no problem with lmgtfy. I *do* have a problem with hiding it behing
> >a tinyurl. Why use 2 levels of obfuscating in a group that's about
> >programming in a language that promotes clear coding?
>
> >The message would have been the same if the OP had just copy pasted the
> >Google link. But hey, that's way less "funny".
>
> Good point, although one could argue the unhidden response is just rude, but
> the masking does make it genuinely funny.
>
> DaveM

I thought the point of LMGTFY was to humorously and innocuously get
across the point that a lot of basic questions can be answered
instantly, or just a few key terms and a mouse click away (i.e. "Was
that so hard?") instead of having to write and post a message to a
group and then wait for responses.  In this sense, using LMGTFY *is* a
memorable transmission of information beyond just the answer to the
question.  It is the meta-information of how to "teach a man to
fish".  If someone "LMGTFY'ed" me due to my asking a really Googleable
question, I'd feel I deserved this gentle ribbing and would make a
note to be more diligent in my searches before asking a forum.



From guillermo.listas at googlemail.com  Sun Mar 14 17:22:46 2010
From: guillermo.listas at googlemail.com (Guillermo)
Date: Sun, 14 Mar 2010 14:22:46 -0700 (PDT)
Subject: Python unicode and Windows cmd.exe
References: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>
	<Xccnn.13044$pv.137@news-server.bigpond.net.au>
Message-ID: <4de2d54b-ecaa-44b0-973b-10138d42562c@r1g2000yqj.googlegroups.com>

> ? ?That is what happens: the file now starts with a BOM \xEB\xBB\xBF as
> you can see with a hex editor.

Is this an enforced convention under Windows, then? My head's aching
after so much pulling at my hair, but I have the feeling that the
problem only arises when text travels through the dos console...

Cheers,
Guillermo


From gatoygata2 at gmail.com  Sun Mar 14 17:25:12 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Sun, 14 Mar 2010 14:25:12 -0700 (PDT)
Subject: Python unicode and Windows cmd.exe
References: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>
	<Xccnn.13044$pv.137@news-server.bigpond.net.au>
	<4de2d54b-ecaa-44b0-973b-10138d42562c@r1g2000yqj.googlegroups.com>
Message-ID: <3193c95f-29c3-44e5-9ac9-23e00b3a33ff@m37g2000yqf.googlegroups.com>

On 14 mar, 22:22, Guillermo <guillermo.lis... at googlemail.com> wrote:
> > ? ?That is what happens: the file now starts with a BOM \xEB\xBB\xBF as
> > you can see with a hex editor.
>
> Is this an enforced convention under Windows, then? My head's aching
> after so much pulling at my hair, but I have the feeling that the
> problem only arises when text travels through the dos console...
>
> Cheers,
> Guillermo

search for BOM in wikipedia.
There it talks about notepad behavior.

ja


From nyamatongwe+thunder at gmail.com  Sun Mar 14 17:35:51 2010
From: nyamatongwe+thunder at gmail.com (Neil Hodgson)
Date: Sun, 14 Mar 2010 21:35:51 GMT
Subject: Python unicode and Windows cmd.exe
In-Reply-To: <4de2d54b-ecaa-44b0-973b-10138d42562c@r1g2000yqj.googlegroups.com>
References: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>
	<Xccnn.13044$pv.137@news-server.bigpond.net.au>
	<4de2d54b-ecaa-44b0-973b-10138d42562c@r1g2000yqj.googlegroups.com>
Message-ID: <XEcnn.13049$pv.4467@news-server.bigpond.net.au>

Guillermo:

> Is this an enforced convention under Windows, then? My head's aching
> after so much pulling at my hair, but I have the feeling that the
> problem only arises when text travels through the dos console...

   The console is commonly using Code Page 437 which is most compatible
with old DOS programs since it can display line drawing characters. You
can change the code page to UTF-8 with
chcp 65001
   Now, "type m.txt" with the original BOM-less file and it should be
OK. You may also need to change the console font to one that is Unicode
compatible like Lucida Console.

   Neil


From tjreedy at udel.edu  Sun Mar 14 17:37:29 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 14 Mar 2010 17:37:29 -0400
Subject: Python unicode and Windows cmd.exe
In-Reply-To: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>
References: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>
Message-ID: <hnjkuo$n16$1@dough.gmane.org>

On 3/14/2010 4:40 PM, Guillermo wrote:
> Hi,
>
> I would appreciate if someone could point out what am I doing wrong
> here.
>
> Basically, I need to save a string containing non-ascii characters to
> a file encoded in utf-8.
>
> If I stay in python, everything seems to work fine, but the moment I
> try to read the file with another Windows program, everything goes to
> hell.
>
> So here's the script unicode2file.py:
> ===================================================================
> # encoding=utf-8
> import codecs
>
> f = codecs.open("m.txt",mode="w", encoding="utf8")
> a = u"ma?ana"
> print repr(a)
> f.write(a)
> f.close()
>
> f = codecs.open("m.txt", mode="r", encoding="utf8")
> a = f.read()
> print repr(a)
> f.close()
> ===================================================================
>
> That gives the expected output, both calls to repr() yield the same
> result.
>
> But now, if I do type me.txt in cmd.exe, I get garbled characters
> instead of "?".
>
> I then open the file with my editor (Sublime Text), and I see "ma?ana"
> normally. I save (nothing to be saved, really), go back to the dos
> prompt, do type m.txt and I get again the same garbled characters.
>
> I then open the file m.txt with notepad, and I see "ma?ana" normally.
> I save (again, no actual modifications), go back to the dos prompt, do
> type m.txt and this time it works! I get "ma?ana". When notepad opens
> the file, the encoding is already UTF-8, so short of a UTF-8 bom being

There is no such thing as a utf-8 'byte order mark'. The concept is an 
oxymoron.

> added to the file, I don't know what happens when I save the
> unmodified file. Also, I would think that the python script should
> save a valid utf-8 file in the first place...

Adding the byte that some call a 'utf-8 bom' makes the file an invalid 
utf-8 file. However, I suspect that notepad wrote the file in the system 
encoding, which can encode n with tilde and which cmd.exe does 
understand. If you started with a file with encoded cyrillic, arabic, 
hindi, and chinese characters (for instance), I suspect you would get a 
different result.

tjr




From wolfgang.lipp at gmail.com  Sun Mar 14 17:40:07 2010
From: wolfgang.lipp at gmail.com (_wolf)
Date: Sun, 14 Mar 2010 14:40:07 -0700 (PDT)
Subject: Is it possible to use re2 from Python?
References: <f853ea28-b236-4a17-8ded-43e5fe455d47@a18g2000yqc.googlegroups.com>
	<mailman.757.1268599807.23598.python-list@python.org>
Message-ID: <827b3e77-6f2a-412f-bfc2-4b7c8747ddcb@g11g2000yqe.googlegroups.com>


i am afraid that thread goes straight perpendicular to what re2 is
supposed to be, or do. my suggestion for these folks would be to
create a new, clean interface to stop the violence that comes with the
Python ``re`` interface, and open the thing up so one can plug in
``re`` implementations as are needed. when i absolutely need a
feature, i can always go to the slower machine; simpler regular
expressions could be dealt with more efficiently.



From wolfgang.lipp at gmail.com  Sun Mar 14 17:40:34 2010
From: wolfgang.lipp at gmail.com (_wolf)
Date: Sun, 14 Mar 2010 14:40:34 -0700 (PDT)
Subject: Is it possible to use re2 from Python?
References: <f853ea28-b236-4a17-8ded-43e5fe455d47@a18g2000yqc.googlegroups.com>
	<mailman.737.1268590742.23598.python-list@python.org>
Message-ID: <0540f7d0-95f6-4b38-900d-dc25958ff232@g26g2000yqn.googlegroups.com>


> There's a recent thread about this on the python-dev list,

pointers? i searched but didn?t find anything.


From guillermo.listas at googlemail.com  Sun Mar 14 17:53:11 2010
From: guillermo.listas at googlemail.com (Guillermo)
Date: Sun, 14 Mar 2010 14:53:11 -0700 (PDT)
Subject: Python unicode and Windows cmd.exe
References: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>
	<Xccnn.13044$pv.137@news-server.bigpond.net.au>
	<4de2d54b-ecaa-44b0-973b-10138d42562c@r1g2000yqj.googlegroups.com>
	<XEcnn.13049$pv.4467@news-server.bigpond.net.au>
Message-ID: <82aa56e1-8000-40bd-96b0-859391dab2e1@q23g2000yqd.googlegroups.com>

> ? ?The console is commonly using Code Page 437 which is most compatible
> with old DOS programs since it can display line drawing characters. You
> can change the code page to UTF-8 with
> chcp 65001

That's another issue in my actual script. A twofold problem, actually:

1) For me chcp gives 850 and I'm relying on that to decode the bytes I
get back from the console.

I suppose this is bound to fail because another Windows installation
might have a different default codepage.

2) My script gets output from a Popen call (to execute a Powershell
script [new Windows shell language] from Python; it does make sense!).
I suppose changing the Windows codepage for a single Popen call isn't
straightforward/possible?

Right now, I only get the desired result if I decode the output from
Popen as "cp850".


From ryan at rfk.id.au  Sun Mar 14 18:13:51 2010
From: ryan at rfk.id.au (Ryan Kelly)
Date: Mon, 15 Mar 2010 09:13:51 +1100
Subject: sqlite savepoint problem
In-Reply-To: <4B99F1D1.2070202@shopzeus.com>
References: <mailman.752.1268596146.23598.python-list@python.org>
	<87bpeqzmmv.fsf@castleamber.com> <4B99E358.4020507@shopzeus.com>
	<1268600658.2846.17.camel@durian> <4B99EE05.8060505@shopzeus.com>
	<4B99F1D1.2070202@shopzeus.com>
Message-ID: <1268604831.2846.23.camel@durian>

On Fri, 2010-03-12 at 08:48 +0100, Laszlo Nagy wrote:
> >
> > I'm now confused. Also, I could not find anything about these 
> > isolation levels on the sqlite website. The only think I could find is 
> > "PRAGMA read_uncommited". If that is the same as setting 
> > isolation_level to None, then I don't want it.
> Yes, it is. Here is a test:

No it isn't.  The "magic" behind isolation_level is a creation of the
python sqlite bindings.  You can probably tell that I'm not a fan of it.

> import os
> import sqlite3
> import threading
> import time
> 
> FPATH = '/tmp/test.sqlite'
> if os.path.isfile(FPATH):
>     os.unlink(FPATH)
> 
> def getconn():
>     global FPATH
>     conn = sqlite3.connect(FPATH)
>     conn.isolation_level = None
>     return conn
> 
> class Thr1(threading.Thread):
>     def run(self):
>         conn = getconn()
>         print "Thr1: Inserting 0,1,2,3,4,5"
>         with conn:
>             for i in range(6):
>                 conn.execute("insert into a values (?)",[i])
>         print "Thr1: Commited"
>         with conn:
>             print "Thr1: Selecting all rows:"
>             for row in conn.execute("select * from a"):
>                 print row
>             print "Thr1: Wait some..."
>             time.sleep(3)
>             print "Thr1: Selecting again, in the same transaction"
>             for row in conn.execute("select * from a"):
>                 print row
> 
> 
> class Thr2(threading.Thread):
>     def run(self):
>         conn = getconn()
>         with conn:
>             print "Thr2: deleting all rows from a"
>             conn.execute("delete from a")
>             print "Thr2: Now we wait some BEFORE commiting changes."
>             time.sleep(3)
>             print "Thr2: Will roll back!"
>             raise Exception
> 
> 
> def main():
>     with getconn() as conn:
>         conn.execute("create table a ( i integer ) ")
>     thr1 = Thr1()
>     thr1.start()
>     time.sleep(1)
>     thr1 = Thr2()
>     thr1.start()
> 
> main()
> 
> 
> And the test result:
> 
> Thr1: Inserting 0,1,2,3,4,5
> Thr1: Commited
> Thr1: Selecting all rows:
> (0,)
> (1,)
> (2,)
> (3,)
> (4,)
> (5,)
> Thr1: Wait some...
> Thr2: deleting all rows from a
> Thr2: Now we wait some BEFORE commiting changes.
> Thr1: Selecting again, in the same transaction
> Thr2: Will roll back!
> Exception in thread Thread-2:
> Traceback (most recent call last):
>   File "/usr/lib/python2.6/threading.py", line 525, in __bootstrap_inner
>     self.run()
>   File "test.py", line 44, in run
>     raise Exception
> Exception
> 
> 
> It means that setting isolation_level to None will really allow 
> uncommited changes to be read by other transactions! This is sad, and of 
> course this is something that I do not want.


No it doesn't.  The problem is that using a connection as a context
manager doesn't do what you think. 

It does *not* start a new transaction on __enter__ and commit it on
__exit__.  As far as I can tell it does nothing on __enter__ and calls
con.commit() or con.rollback() on exit.  With isolation_level=None,
these are no-ops.

If you create your own connection wrapper that explicitly creates and
commits transactions, you example will work fine with
isolation_level=None.  Here's the relevant changes:


  class MyConn(sqlite3.Connection):
      def __enter__(self):
          self.execute("BEGIN")
          return self
      def __exit__(self,exc_type,exc_info,traceback):
          if exc_type is None:
              self.execute("COMMIT")
          else:
              self.execute("ROLLBACK")

  def getconn():
      global FPATH
      conn = sqlite3.connect(FPATH,factory=MyConn)
      conn.isolation_level = None
      return conn


  Cheers,

     Ryan


-- 
Ryan Kelly
http://www.rfk.id.au  |  This message is digitally signed. Please visit
ryan at rfk.id.au        |  http://www.rfk.id.au/ramblings/gpg/ for details

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From nyamatongwe+thunder at gmail.com  Sun Mar 14 18:15:41 2010
From: nyamatongwe+thunder at gmail.com (Neil Hodgson)
Date: Sun, 14 Mar 2010 22:15:41 GMT
Subject: Python unicode and Windows cmd.exe
In-Reply-To: <82aa56e1-8000-40bd-96b0-859391dab2e1@q23g2000yqd.googlegroups.com>
References: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>
	<Xccnn.13044$pv.137@news-server.bigpond.net.au>
	<4de2d54b-ecaa-44b0-973b-10138d42562c@r1g2000yqj.googlegroups.com>
	<XEcnn.13049$pv.4467@news-server.bigpond.net.au>
	<82aa56e1-8000-40bd-96b0-859391dab2e1@q23g2000yqd.googlegroups.com>
Message-ID: <hednn.13050$pv.10703@news-server.bigpond.net.au>

Guillermo:

> 2) My script gets output from a Popen call (to execute a Powershell
> script [new Windows shell language] from Python; it does make sense!).
> I suppose changing the Windows codepage for a single Popen call isn't
> straightforward/possible?

   You could try SetConsoleOutputCP and SetConsoleCP.

   Neil


From guillermo.listas at googlemail.com  Sun Mar 14 18:21:11 2010
From: guillermo.listas at googlemail.com (Guillermo)
Date: Sun, 14 Mar 2010 15:21:11 -0700 (PDT)
Subject: Python unicode and Windows cmd.exe
References: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>
	<Xccnn.13044$pv.137@news-server.bigpond.net.au>
	<4de2d54b-ecaa-44b0-973b-10138d42562c@r1g2000yqj.googlegroups.com>
	<XEcnn.13049$pv.4467@news-server.bigpond.net.au>
	<82aa56e1-8000-40bd-96b0-859391dab2e1@q23g2000yqd.googlegroups.com>
Message-ID: <7f81925a-01f3-4d69-b67e-725bd176e440@z4g2000yqa.googlegroups.com>

> 2) My script gets output from a Popen call (to execute a Powershell
> script [new Windows shell language] from Python; it does make sense!).
> I suppose changing the Windows codepage for a single Popen call isn't
> straightforward/possible?

Nevermind. I'm able to change Windows' codepage to 65001 from within
the Powershell script and I get back a string encoded in UTF-8 with
BOM, so problem solved!

Thanks for the help,
Guillermo


From CalWhoNOSPAM at roadrunner.com  Sun Mar 14 18:49:48 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Sun, 14 Mar 2010 18:49:48 -0400
Subject: What does Error: 'module' object is not callable Mean?
References: <hnj9ea$hdi$1@news.eternal-september.org>
	<hnjimh$je1$1@news.eternal-september.org>
Message-ID: <hnjp6f$l4$1@news.eternal-september.org>

I cleaned up the code by moving all the imports to the top.
 There are two plotting routines shown below.
 Either one will work without error.
 But when I include both,  running produces:
 The exception unknown software exception (0x40000015) occurred in the
 application at location 0x1e05b62a.
 In a dialog box and the following in the console:
 Fatal Python error: PyEval_RestoreThread: NULL tstate
  This application has requested the Runtime to terminate it in an unusual
 way.
  Please contact the application's support team for more information.

 Do you see what is wrong?

 Thanks a lot

from pylab import plot, legend, title, grid, show, xlabel, ylabel
...snip....

#FIRST PLOT
plot( targets2, 'b--' )
plot( output, 'k-' )
legend(('target', 'output'))
xlabel('pattern'); ylabel('benign or malignant')
title('Outputs vs. target of trained network.')
grid(True)
show()

#SECOND PLOT
drawffnet(nn)
show() 




From missive at hotmail.com  Sun Mar 14 19:06:19 2010
From: missive at hotmail.com (Lee Harr)
Date: Mon, 15 Mar 2010 03:36:19 +0430
Subject: [ANNC] pynguin-0.4 (python turtle graphics application)
Message-ID: <SNT106-W10175CEB52F64D3CF69EEBB12F0@phx.gbl>


Pynguin is a python-based turtle graphics application.
??? It combines an editor, interactive interpreter, and
??? graphics display area.

It is meant to be an easy environment for introducing
??? some programming concepts to beginning programmers.


http://pynguin.googlecode.com/


This release continues adding basic functionality and
??? refining the interface. If you are interested, please
??? take a look and let me know what you think.


Pynguin is tested with Python 2.6.4 and uses PyQt (4.6)
??? for its GUI elements. Pynguin is released under GPLv3.


Changes in pynguin-0.4:
??? - improved document switcher
??? - added easy 'random' color access
??? - added new commands
??????? - onscreen
??????? - onclick
??????? - stamp
??????? - viewcoords
??? - winding fill now default
??????? - added method to switch between winding/oddeven fill
??? - show file name in window header
??? - more examples
??? - added default values for examples that take parameters
??? - fixed star example for even number of sides
??? - fixed crash when changing to alternate view image
??? - fixed problem running code with blank lines
??? - fixed problem with ctrl key getting stuck on
??? - added bug report option in Help menu
??? - allow keypad Enter same as Return
??? - factored in to multiple files

Changes in pynguin-0.3:
??? - added new commands
??????? - goto
??????? - turnto
??????? - lineto
??????? - distance
??????? - toward
??????? - write
??? - added more examples
??? - fixed problem when changing speed while code is running
??? - editor auto-indent improvement

 		 	   		  
_________________________________________________________________
Hotmail: Powerful Free email with security by Microsoft.
https://signup.live.com/signup.aspx?id=60969


From ryan at rfk.id.au  Sun Mar 14 19:16:19 2010
From: ryan at rfk.id.au (Ryan Kelly)
Date: Mon, 15 Mar 2010 10:16:19 +1100
Subject: sqlite savepoint problem
In-Reply-To: <4B99EE05.8060505@shopzeus.com>
References: <mailman.752.1268596146.23598.python-list@python.org>
	<87bpeqzmmv.fsf@castleamber.com>  <4B99E358.4020507@shopzeus.com>
	<1268600658.2846.17.camel@durian>  <4B99EE05.8060505@shopzeus.com>
Message-ID: <1268608579.2846.34.camel@durian>

On Fri, 2010-03-12 at 08:32 +0100, Laszlo Nagy wrote:
> > From memory you can't issue a "CREATE TABLE" statement inside a
> > transaction, at least not at the default isolation level.  Such a
> > statement will automatically commit the current transaction.  Doesn't
> > help with your current problem but worth pointing out :-)
> >   
> Thank you. I'll keep in mind.
> > When debugging strange transaction behaviour, I find it easiest to
> > create the connection with isolation_level=None so that are no implicit
> > transactions being created behind your back.  Not sure why, but setting
> > this makes your example work for me.
> >   
> Yes, same for me. But setting it to None means auto commit mode! See here:
> 
> http://docs.python.org/library/sqlite3.html#sqlite3-controlling-transactions
> 
> 
> But it does not work that way. Look at this example
> 
> import sqlite3
> 
> conn = sqlite3.connect(':memory:')
> conn.isolation_level = None
> with conn:
>     conn.execute("create table a ( i integer ) ")
> 
> with conn:
>     conn.execute("insert into a values (1)")
>     conn.execute("SAVEPOINT sp1")
>     conn.execute("insert into a values (2)")
>     conn.execute("SAVEPOINT sp2")
>     conn.execute("insert into a values (3)")
>     conn.execute("ROLLBACK TO sp2")
>     conn.execute("insert into a values (4)")
>     conn.execute("RELEASE sp1")
> 
> with conn:
>     for row in conn.execute("select * from a"):
>         print row
>        
> 
> It prints:
> 
> (1,)
> (2,)
> (4,)
> 
> So everything is working. Nothing is auto commited. But if I change it 
> to "DEFERRED" or "IMMEDIATE" or "EXCLUSIVE" then it won't work. Why?

I have a theory, based on a quick perusal of the sqlite3 bindings
source.

The bindings think that "SAVEPOINT sp1" is a "non-DML, non-query"
statement. So when isolation_level is something other than None, this
statement implicitly commits the current transaction and throws away
your savepoints!

Annotating your example:

  # entering this context actually does nothing
  with conn:
     # a transaction is magically created before this statement
     conn.execute("insert into a values (1)")
     # and is implicitly committed before this statement
     conn.execute("SAVEPOINT sp1")
     # a new transaction is magically created
     conn.execute("insert into a values (2)")
     # and committed, discarding the first savepoint.
     conn.execute("SAVEPOINT sp2")
     # a new transaction is magically created
     conn.execute("insert into a values (3)")
     # and committed, discarding the very savepoint we are trying to use. 
     conn.execute("ROLLBACK TO sp2")
     conn.execute("insert into a values (4)")
     conn.execute("RELEASE sp1")


In your previous multi-threaded example, try adding a "SAVEPOINT sp1"
statement after deleting the rows in Thread2.  You'll see that the
delete is immediately committed and the rows cannot be read back by
Thread1.  (modified version attached for convenience).


  Cheers,

     Ryan

-- 
Ryan Kelly
http://www.rfk.id.au  |  This message is digitally signed. Please visit
ryan at rfk.id.au        |  http://www.rfk.id.au/ramblings/gpg/ for details

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From steve at REMOVE-THIS-cybersource.com.au  Sun Mar 14 19:18:28 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 14 Mar 2010 23:18:28 GMT
Subject: python to exe
References: <68d965b4-3039-4bd1-a75f-353903e6218b@g28g2000yqh.googlegroups.com>
	<b467efdb-8c2d-4367-8223-9b70b1600b53@g26g2000yqn.googlegroups.com>
	<87bpes6e4l.fsf@castleamber.com>
	<4b9b3513$0$27822$c3e8da3@news.astraweb.com>
	<87fx443vgo.fsf@castleamber.com>
	<lpcop5d7qgc7a4qbdqu5jf4r5da1ojkqhj@4ax.com>
	<87sk82zplj.fsf@castleamber.com>
	<r4gqp5du2f3gamdgkjeul4nag9sr3299v1@4ax.com>
	<87fx42zms9.fsf@castleamber.com>
Message-ID: <4b9d6ec4$0$27822$c3e8da3@news.astraweb.com>

On Sun, 14 Mar 2010 14:11:18 -0600, John Bokma wrote:

> One could argue, sure. But to me it's just the same as posting GFY
> (don't want to upset the tender soulds again with "the F-word".

Are you *still* going on about this thing? Sheesh.

You've made your point. You don't think posting links to Let Me Google 
That For You is friendly; you think that "hiding" those links behind 
tinyurl is downright hostile; and you think that heaping abuse and 
obscenities on the person who posted the link is acceptable behaviour.

You've made it abundantly clear that your concern about keeping this 
group friendly only applies to others, not to you. Can we move on now?



-- 
Steven



From CalWhoNOSPAM at roadrunner.com  Sun Mar 14 19:37:00 2010
From: CalWhoNOSPAM at roadrunner.com ( Cal Who)
Date: Sun, 14 Mar 2010 19:37:00 -0400
Subject: What does Error: 'module' object is not callable Mean?
References: <hnj9ea$hdi$1@news.eternal-september.org>
	<hnjimh$je1$1@news.eternal-september.org>
	<hnjp6f$l4$1@news.eternal-september.org>
Message-ID: <hnjruu$ho2$1@news.eternal-september.org>

I found it. Had to use "figure" to create a new figure!


" Cal Who" <CalWhoNOSPAM at roadrunner.com> wrote in message 
news:hnjp6f$l4$1 at news.eternal-september.org...
>I cleaned up the code by moving all the imports to the top.
> There are two plotting routines shown below.
> Either one will work without error.
> But when I include both,  running produces:
> The exception unknown software exception (0x40000015) occurred in the
> application at location 0x1e05b62a.
> In a dialog box and the following in the console:
> Fatal Python error: PyEval_RestoreThread: NULL tstate
>  This application has requested the Runtime to terminate it in an unusual
> way.
>  Please contact the application's support team for more information.
>
> Do you see what is wrong?
>
> Thanks a lot
>
> from pylab import plot, legend, title, grid, show, xlabel, ylabel
> ...snip....
>
> #FIRST PLOT
> plot( targets2, 'b--' )
> plot( output, 'k-' )
> legend(('target', 'output'))
> xlabel('pattern'); ylabel('benign or malignant')
> title('Outputs vs. target of trained network.')
> grid(True)
> show()
>
> #SECOND PLOT
> drawffnet(nn)
> show()
> 




From tjreedy at udel.edu  Sun Mar 14 19:39:46 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 14 Mar 2010 19:39:46 -0400
Subject: Understanding the CPython dict implementation
Message-ID: <hnjs41$bt6$1@dough.gmane.org>

I found this PyCon2010 presentation to be excellent:
The Mighty Dictionary, Branden Craig Rhodes, 30 min.
http://pycon.blip.tv/file/3264041/

Even knowing Python for over a decade, I learned a few things.

Terry Jan Reedy



From metolone+gmane at gmail.com  Sun Mar 14 20:02:15 2010
From: metolone+gmane at gmail.com (Mark Tolonen)
Date: Sun, 14 Mar 2010 17:02:15 -0700
Subject: Python unicode and Windows cmd.exe
References: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>
	<hnjkuo$n16$1@dough.gmane.org>
Message-ID: <hnjte5$f06$1@dough.gmane.org>


"Terry Reedy" <tjreedy at udel.edu> wrote in message 
news:hnjkuo$n16$1 at dough.gmane.org...
On 3/14/2010 4:40 PM, Guillermo wrote:
> Adding the byte that some call a 'utf-8 bom' makes the file an invalid 
> utf-8 file.

Not true.  From http://unicode.org/faq/utf_bom.html:

Q: When a BOM is used, is it only in 16-bit Unicode text?
A: No, a BOM can be used as a signature no matter how the Unicode text is 
transformed: UTF-16, UTF-8, UTF-7, etc. The exact bytes comprising the BOM 
will be whatever the Unicode character FEFF is converted into by that 
transformation format. In that form, the BOM serves to indicate both that it 
is a Unicode file, and which of the formats it is in. Examples:
BytesEncoding Form
00 00 FE FF UTF-32, big-endian
FF FE 00 00 UTF-32, little-endian
FE FF            UTF-16, big-endian
FF FE            UTF-16, little-endian
EF BB BF      UTF-8

-Mark




From alfps at start.no  Sun Mar 14 20:37:04 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Mon, 15 Mar 2010 01:37:04 +0100
Subject: Python unicode and Windows cmd.exe
In-Reply-To: <mailman.769.1268611351.23598.python-list@python.org>
References: <60eec6cf-b62f-4b7e-b461-9f537d62bff5@m37g2000yqf.googlegroups.com>	<hnjkuo$n16$1@dough.gmane.org>
	<mailman.769.1268611351.23598.python-list@python.org>
Message-ID: <hnjvfk$b83$1@news.eternal-september.org>

* Mark Tolonen:
> 
> "Terry Reedy" <tjreedy at udel.edu> wrote in message 
> news:hnjkuo$n16$1 at dough.gmane.org...
> On 3/14/2010 4:40 PM, Guillermo wrote:
>> Adding the byte that some call a 'utf-8 bom' makes the file an invalid 
>> utf-8 file.
> 
> Not true.  From http://unicode.org/faq/utf_bom.html:
> 
> Q: When a BOM is used, is it only in 16-bit Unicode text?
> A: No, a BOM can be used as a signature no matter how the Unicode text 
> is transformed: UTF-16, UTF-8, UTF-7, etc. The exact bytes comprising 
> the BOM will be whatever the Unicode character FEFF is converted into by 
> that transformation format. In that form, the BOM serves to indicate 
> both that it is a Unicode file, and which of the formats it is in. 
> Examples:
> BytesEncoding Form
> 00 00 FE FF UTF-32, big-endian
> FF FE 00 00 UTF-32, little-endian
> FE FF            UTF-16, big-endian
> FF FE            UTF-16, little-endian
> EF BB BF      UTF-8

Well, technically true, and Terry was wrong about "There is no such thing as a 
utf-8 'byte order mark'. The concept is an oxymoron.". It's true that as a 
descriptive term "byte order mark" is an oxymoron for UTF-8. But in this 
particular context it's not a descriptive term, and it's not only technically 
allowed, as you point out, but sometimes required.

However, some tools are unable to process UTF-8 files with BOM.

The most annoying example is the GCC compiler suite, in particular g++, which in 
its Windows MinGW manifestation insists on UTF-8 source code without BOM, while 
Microsoft's compiler needs the BOM to recognize the file as UTF-8  --  the only 
way I found to satisfy both compilers, apart from a restriction to ASCII or 
perhaps Windows ANSI with wide character literals restricted to ASCII 
(exploiting a bug in g++ that lets it handle narrow character literals with 
non-ASCII chars) is to preprocess the source code. But that's not a general 
solution since the g++ preprocessor, via another bug, accepts some constructs 
(which then compile nicely) which the compiler doesn't accept when explicit 
preprocessing isn't used. So it's a mess.


Cheers,

- Alf


From pmaupin at gmail.com  Sun Mar 14 22:07:41 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sun, 14 Mar 2010 19:07:41 -0700 (PDT)
Subject: iterator/generator
References: <db51dbb8-920a-405a-8ddc-2a734f7140ac@q21g2000yqm.googlegroups.com>
Message-ID: <ba7a983b-1fc5-4a12-af0b-5fc9c64f7717@33g2000yqj.googlegroups.com>

First of all, as Steve Holden mentioned, do look at xlrd.  It's
awesome.

Second, for your (a) question, if you want an iterator, that's quite
easy:

matriz = iter(matriz)
matriz.next()  # Discard the first one
for i in matriz:

This technique works really well, especially if you have sub-loops.
Then, if you use a defaultdict which uses a list for a constructor

    for i in matriz:
        if i[a] and i[b]:
            g[i[a]].append(i[b])

HTH,
Pat


From timr at probo.com  Sun Mar 14 22:14:56 2010
From: timr at probo.com (Tim Roberts)
Date: Sun, 14 Mar 2010 19:14:56 -0700
Subject: result of os.times() is different with 'time' command Options
References: <16861cbc-4460-4d67-ab46-ff03517173d4@g8g2000pri.googlegroups.com>
Message-ID: <fc5rp5th2qkdadi43h1hsjoimh4e88nvp4@4ax.com>

hiral <hiralsmaillist at gmail.com> wrote:
>...
>Output:
>real    0.0m0.0100000002421s
>user    0.0m0.0s
>sys     0.0m0.0s
>
>
>Command:
>$ time ls
>
>Output:
>real    0m0.007s
>user    0m0.000s
>sys     0m0.000s
>
>
>Is this the intended behaviour?

What is it that you are wondering about?  The formatting difference is due
to your code.  The difference between 10 milliseconds and 7 milliseconds
could be due to any number of things.  First, you have the overhead of
Python involved in your measurements.  Second, you have the variability of
memory caching and disk caching.  Your Python code causes /bin/ls to be
loaded into memory, and it's probably still in a file cache when you run
the second command.

You can't really do an analysis like this with a task that only takes a few
milliseconds.  There are too many variables.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From mehgcap at gmail.com  Sun Mar 14 23:43:35 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Sun, 14 Mar 2010 23:43:35 -0400
Subject: dll in project?
Message-ID: <bc7f680c1003142043y78505aa3jb5e70360a692ebc8@mail.gmail.com>

Hi all,
I have a dll I am trying to use, but I get a Windows error 126, "the
specified module could not be found". Here is the code segment:
nvdaController=ctypes.windll.LoadLibrary("nvdaControllerClient32.dll") 	

I have the specified dll file in the same directory as the file trying
to use said dll, and this is the only reference I make to the dll. Do
I need to register it somehow? If so, does this need to be done once,
or each time the application runs? If I need to register it, how would
I do so? Thanks!
-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From nagle at animats.com  Mon Mar 15 00:05:36 2010
From: nagle at animats.com (John Nagle)
Date: Sun, 14 Mar 2010 21:05:36 -0700
Subject: Are there in Python some static web site generating tools like
	webgen, nanoc or webby in Ruby ?
In-Reply-To: <mailman.502.1268154912.23598.python-list@python.org>
References: <mailman.502.1268154912.23598.python-list@python.org>
Message-ID: <4b9dad7c$0$1639$742ec2ed@news.sonic.net>

     The HTMLTemplate module is useful for static web page generation.
It doesn't do much.  It's not a "content management system".
If you just need to generate a page with some data items filled in, it's fine.
If you need more than that, there are bigger packages, but they have more
baggage.

					John Nagle


From nagle at animats.com  Mon Mar 15 00:06:48 2010
From: nagle at animats.com (John Nagle)
Date: Sun, 14 Mar 2010 21:06:48 -0700
Subject: Understanding the CPython dict implementation
In-Reply-To: <mailman.768.1268610003.23598.python-list@python.org>
References: <mailman.768.1268610003.23598.python-list@python.org>
Message-ID: <4b9dadc4$0$1639$742ec2ed@news.sonic.net>

Terry Reedy wrote:
> I found this PyCon2010 presentation to be excellent:
> The Mighty Dictionary, Branden Craig Rhodes, 30 min.
> http://pycon.blip.tv/file/3264041/
> 
> Even knowing Python for over a decade, I learned a few things.
> 
> Terry Jan Reedy

    Is this available as a paper?

				John Nagle


From alfps at start.no  Mon Mar 15 00:19:41 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Mon, 15 Mar 2010 05:19:41 +0100
Subject: dll in project?
In-Reply-To: <mailman.770.1268624619.23598.python-list@python.org>
References: <mailman.770.1268624619.23598.python-list@python.org>
Message-ID: <hnkch1$9ln$1@news.eternal-september.org>

* Alex Hall:
> Hi all,
> I have a dll I am trying to use, but I get a Windows error 126, "the
> specified module could not be found". Here is the code segment:
> nvdaController=ctypes.windll.LoadLibrary("nvdaControllerClient32.dll") 	
> 
> I have the specified dll file in the same directory as the file trying
> to use said dll, and this is the only reference I make to the dll. Do
> I need to register it somehow? If so, does this need to be done once,
> or each time the application runs? If I need to register it, how would
> I do so? Thanks!

If 'ctypes.windll.LoadLibrary' just calls the Windows API LoadLibrary function 
without adding any path, then the directories considered will only be those 
known to the Windows API, like e.g. the process' current directory (I'm not sure 
if the current directory is considered, but the details aren't important).

And most likely your calling script file is not in any of those directories.

Probably it will work to specify the full path to the DLL. You can obtain the 
path to the calling file's directory by using the __file__ variable and the 
'os.path' functions.


Cheers & hth.,

- Alf


From alfps at start.no  Mon Mar 15 00:24:46 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Mon, 15 Mar 2010 05:24:46 +0100
Subject: File existence check with partial filename
In-Reply-To: <C7C2FE43.5AB0%Sang-Ho.Yun@jpl.nasa.gov>
References: <C7C2FE43.5AB0%Sang-Ho.Yun@jpl.nasa.gov>
Message-ID: <hnkcqh$avd$1@news.eternal-september.org>

* Sang-Ho Yun:
> I learned that I can check the existence of a file using
> os.path.isfile("filename").
> 
> What if I need to check if there is a file that contains "HV" in the
> filename?  What should I do?

<code>
     from __future__ import print_function
     import os

     for filename in os.listdir( "." ):
         if "HV" in filename.upper():
             print( filename )
</code>


Cheers & hth.,

- Alf


From gherron at islandtraining.com  Mon Mar 15 00:29:26 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Sun, 14 Mar 2010 21:29:26 -0700
Subject: File existence check with partial filename
In-Reply-To: <hnkcqh$avd$1@news.eternal-september.org>
References: <C7C2FE43.5AB0%Sang-Ho.Yun@jpl.nasa.gov>
	<hnkcqh$avd$1@news.eternal-september.org>
Message-ID: <4B9DB7A6.2010802@islandtraining.com>

Alf P. Steinbach wrote:
> * Sang-Ho Yun:
>> I learned that I can check the existence of a file using
>> os.path.isfile("filename").
>>
>> What if I need to check if there is a file that contains "HV" in the
>> filename?  What should I do?
>
> <code>
>     from __future__ import print_function
>     import os
>
>     for filename in os.listdir( "." ):
>         if "HV" in filename.upper():
>             print( filename )
> </code>
>
>
> Cheers & hth.,
>
> - Alf

Or learn the glob module.  It allows you to ask for a list of files 
matching a pattern that can include wildcard characters  -- probably 
"*HV*" for your case.

Gary Herron



From Sang-Ho.Yun at jpl.nasa.gov  Mon Mar 15 00:57:39 2010
From: Sang-Ho.Yun at jpl.nasa.gov (Sang-Ho Yun)
Date: Sun, 14 Mar 2010 20:57:39 -0800
Subject: File existence check with partial filename
Message-ID: <C7C2FE43.5AB0%Sang-Ho.Yun@jpl.nasa.gov>

I learned that I can check the existence of a file using
os.path.isfile("filename").

What if I need to check if there is a file that contains "HV" in the
filename?  What should I do?

Thank you,
Sang-Ho



From jgardner at jonathangardner.net  Mon Mar 15 00:57:58 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Sun, 14 Mar 2010 21:57:58 -0700
Subject: NoSQL Movement?
In-Reply-To: <20100314095513.61b0fbaa.darcy@druid.net>
References: <74ea9dd7-a9c0-4b44-842c-61c9c7f630eb@u15g2000prd.googlegroups.com>
	<fa1670b8-c6c6-4409-bcf4-058d2e587a16@y11g2000yqh.googlegroups.com>
	<mailman.256.1267655008.23598.python-list@python.org>
	<BABjn.11012$pv.4575@news-server.bigpond.net.au>
	<6cc20cea1003120105j626cc519o2271106e088b2e90@mail.gmail.com>
	<mailman.664.1268404115.23598.python-list@python.org>
	<7xljdx73a9.fsf@ruckus.brouhaha.com>
	<6cc20cea1003132342s6daefa43m6839a35bff37e0bb@mail.gmail.com>
	<20100314095513.61b0fbaa.darcy@druid.net>
Message-ID: <6cc20cea1003142157h21a1cf22o58899265cd28964f@mail.gmail.com>

On Sun, Mar 14, 2010 at 6:55 AM, D'Arcy J.M. Cain <darcy at druid.net> wrote:
> On Sat, 13 Mar 2010 23:42:31 -0800
> Jonathan Gardner <jgardner at jonathangardner.net> wrote:
>> On Fri, Mar 12, 2010 at 11:23 AM, Paul Rubin <no.email at nospam.invalid> wrote:
>> > "D'Arcy J.M. Cain" <darcy at druid.net> writes:
>> >> Just curious, what database were you using that wouldn't keep up with
>> >> you? ?I use PostgreSQL and would never consider going back to flat
>> >> files.
>> >
>> > Try making a file with a billion or so names and addresses, then
>> > compare the speed of inserting that many rows into a postgres table
>> > against the speed of copying the file.
>
> That's a straw man argument. ?Copying an already built database to
> another copy of the database won't be significantly longer than copying
> an already built file. ?In fact, it's the same operation.
>

I don't understand what you're trying to get at.

Each bit of data follows a particular path through the system. Each
bit of data has its own requirements for availability and consistency.
No, relational DBs don't have the same performance characteristic as
other data systems because they do different things.

If you have data that fits a particular style well, then I suggest
using that style to manage that data.

Let's say I had data that needs to hang around for a little while then
disappear into the archives. Let's say you hardly ever do random
access on this data because you always work with it serially or in
large batches. This is exactly like the recipient d

>> Also consider how much work it is to partition data from flat files
>> versus PostgreSQL tables.
>
> Another straw man. ?I'm sure you can come up with many contrived
> examples to show one particular operation faster than another.
> Benchmark writers (bad ones) do it all the time. ?I'm saying that in
> normal, real world situations where you are collecting billions of data
> points and need to actually use the data that a properly designed
> database running on a good database engine will generally be better than
> using flat files.
>

You're thinking in the general. Yes, RDBMs do wonderful things in the
general cases. However, in very specific circumstances, RDBMS do a
whole lot worse.

Think of the work involved in sharding an RDBMS instance. You need to
properly implement two-phase commit above and beyond the normal work
involved. I haven't run into a multi-master replication system that is
trivial. When you find one, let me know, because I'm sure there are
caveats and corner cases that make things really hard to get right.

Compare this to simply distributing flat files to one of many
machines. It's a whole lot easier to manage and easier to understand,
explain, and implement.

You should use the right tool for the job. Sometimes the data doesn't
fit the profile of an RDBMs, or the RDBMs overhead makes managing the
data more difficult than it needs to be. In those cases, it makes a
whole lot of sense to try something else out.

>> >> The only thing I can think of that might make flat files faster is
>> >> that flat files are buffered whereas PG guarantees that your
>> >> information is written to disk before returning
>> >
>> > Don't forget all the shadow page operations and the index operations,
>> > and that a lot of these operations require reading as well as writing
>> > remote parts of the disk, so buffering doesn't help avoid every disk
>> > seek.
>
> Not sure what a "shadow page operation" is but index operations are
> only needed if you have to have fast access to read back the data. ?If
> it doesn't matter how long it takes to read the data back then don't
> index it. ?I have a hard time believing that anyone would want to save
> billions of data points and not care how fast they can read selected
> parts back or organize the data though.
>

I don't care how the recipients for the email campaign were indexed. I
don't need an index because I don't do random accesses. I simply need
the list of people I am going to send the email campaign to, properly
filtered and de-duped, of course. This doesn't have to happen within
the database. There are wonderful tools like "sort" and "uniq" to do
this work for me, far faster than an RDBMS can do it. In fact, I don't
think you can come up with a faster solution than "sort" and "uniq".

>> Plus the fact that your other DB operations slow down under the load.
>
> Not with the database engines that I use. ?Sure, speed and load are
> connected whether you use databases or flat files but a proper database
> will scale up quite well.
>

I know for a fact that "sort" and "uniq" are far faster than any
RDBMs. The reason why is obvious.

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From efiish at gmail.com  Mon Mar 15 02:44:38 2010
From: efiish at gmail.com (Lan Qing)
Date: Mon, 15 Mar 2010 14:44:38 +0800
Subject: Fwd: Some PyCon videos won't play
In-Reply-To: <hnjjt5$jsk$1@dough.gmane.org>
References: <SNT106-W28E9678F29E5527CFCBB88B1300@phx.gbl>
	<mailman.716.1268506909.23598.python-list@python.org>
	<hniugj$b36$1@get-news01.get.basefarm.net>
	<hnjakh$mcv$1@dough.gmane.org> <hnjjt5$jsk$1@dough.gmane.org>
Message-ID: <ee9ad2071003142344w7aa3607di24639a5c5b7c4aaf@mail.gmail.com>

In China these video can not watch at all. I must spent 3 days to download
it...

On Mon, Mar 15, 2010 at 5:19 AM, Terry Reedy <tjreedy at udel.edu> wrote:

> On 3/14/2010 2:41 PM, Terry Reedy wrote:
>
>> On 3/14/2010 11:14 AM, David Boddie wrote:
>>
>
>  You should still be able to get at the videos themselves by inspecting
>>> the page contents, looking for download links like this one:
>>>
>>>
>>> http://blip.tv/file/get/Pycon-PyCon2010UsingPythonToCreateRoboticSimulationsForPlaneta894.ogv
>>>
>>>
>>> In this case, it's an Ogg Theora video file, so you may want to use
>>> a player like VLC to view it:
>>>
>>
>> For people using html5 competant browsers, which, I believe, play .ogv
>> 'in tha page', blip.tv just needs to update site to make html5 pages an
>> alternative to using the flash player.
>>
>
> Actually, for FF3.6, at least, the problem is already solved. I just click
> on the download button and FF recognizes .ogv as something it can play and
> it does, replacing the flash player. The FF player lacks a full-screen
> button, but that is rarely needed for the talks.
>
> tjr
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From hiralsmaillist at gmail.com  Mon Mar 15 02:51:28 2010
From: hiralsmaillist at gmail.com (hiral)
Date: Sun, 14 Mar 2010 23:51:28 -0700 (PDT)
Subject: result of os.times() is different with 'time' command Options
References: <16861cbc-4460-4d67-ab46-ff03517173d4@g8g2000pri.googlegroups.com>
	<fc5rp5th2qkdadi43h1hsjoimh4e88nvp4@4ax.com>
Message-ID: <61c563ad-f0c3-47ae-b689-36c397f88295@l11g2000pro.googlegroups.com>

On Mar 15, 7:14?am, Tim Roberts <t... at probo.com> wrote:
> hiral<hiralsmaill... at gmail.com> wrote:
> >...
> >Output:
> >real ? ?0.0m0.0100000002421s
> >user ? ?0.0m0.0s
> >sys ? ? 0.0m0.0s
>
> >Command:
> >$ time ls
>
> >Output:
> >real ? ?0m0.007s
> >user ? ?0m0.000s
> >sys ? ? 0m0.000s
>
> >Is this the intended behaviour?
>
> What is it that you are wondering about? ?The formatting difference is due
> to your code. ?The difference between 10 milliseconds and 7 milliseconds
> could be due to any number of things. ?First, you have the overhead of
> Python involved in your measurements. ?Second, you have the variability of
> memory caching and disk caching. ?Your Python code causes /bin/ls to be
> loaded into memory, and it's probably still in a file cache when you run
> the second command.
>
> You can't really do an analysis like this with a task that only takes a few
> milliseconds. ?There are too many variables.
> --
> Tim Roberts, t... at probo.com
> Providenza & Boekelheide, Inc.- Hide quoted text -
>
> - Show quoted text -

Thanks for your explanation.


From hiralsmaillist at gmail.com  Mon Mar 15 02:51:42 2010
From: hiralsmaillist at gmail.com (hiral)
Date: Sun, 14 Mar 2010 23:51:42 -0700 (PDT)
Subject: to create variable from dict
References: <4859ed52-7276-4617-b25e-902b52cfe7c5@s36g2000prh.googlegroups.com>
	<ecc59606-b4c2-418f-9cb2-27e9b2c47714@o30g2000yqb.googlegroups.com> 
	<mailman.666.1268406201.23598.python-list@python.org>
Message-ID: <dd2d779d-cfa3-464a-aceb-5cb1b7aa85ab@l24g2000prh.googlegroups.com>

On Mar 12, 8:02?pm, Jean-Michel Pichavant <jeanmic... at sequans.com>
wrote:
> Luis M. Gonz?lez wrote:
> > On Mar 12, 10:59 am,hiral<hiralsmaill... at gmail.com> wrote:
>
> >> Hi,
>
> >> Is there any way to create variables which name matches with dict key?
>
> >> For example:
> >> dict1 = {"abc":'1", "def":"2"}
>
> >> Now I am looking to have variable name abc and it's value be '1' etc.
>
> >> Pl. suggest.
>
> >> Thank you.
>
> > Check out this thread (very recent):
> >http://groups.google.com/group/comp.lang.python/browse_thread/thread/...
>
> > Short answer: you can update globals() with a dictionary, as follows:
>
> > globals().update( dict1 )
>
> > Then you'll have each key-value pair as variables in the global
> > namespace.
> > The question is: should you do it?
>
> > Luis
>
> The answer is known: no, he should not do it :o)
>
> JM- Hide quoted text -
>
> - Show quoted text -

Thanks for your explanations.


From xahlee at gmail.com  Mon Mar 15 03:16:33 2010
From: xahlee at gmail.com (Xah Lee)
Date: Mon, 15 Mar 2010 00:16:33 -0700 (PDT)
Subject: Hacker News, Xahlee.Org, and What is Politics?
Message-ID: <5b32bf8e-6adc-42a6-8a98-228b13e8a3f1@w9g2000prb.googlegroups.com>

A essay related to the recent discussion of banning, and lisp
associated group at ycombinator.com .

---------------------------------------------
Hacker News, Xahlee.Org, and What is Politics?

Xah Lee, 2010-03-14

Today, i noticed that someone posted one of my article ?Why Emacs is
still so useful today? on my blogger site (xahlee.blogspot.com) to
Hacker News site here: Source.

Note that my site XahLee.org was unceremoniously banned around 2009-02
by the admin geekers there. (see bottom of: Ban Xah Lee). But,
apparantly, someone found my article useful. Now, in order to submit
my articles, you'll have to use my article mirror at
blogger.blogspot.com instead of xahlee.org.

--------------------
Tech Geeker's Ignorance Of Politics

The human nature of power struggle never ends. Many of these tech
geekers think they are apolitical, that they are peace loving, they
ride bikes not driving machines that pollute, they don't have interest
in business, they embrace the Free of ?freedom? Software or Open
Source of ?openness? software. The problem of human animals is that,
we all think that, yet, power struggle or the formation of politics
isn't something you consciously decide to do. Rather, it is something
that you unconsciously do whenever you have interaction with peers
when resources are not infinite. At the basic level, you have quarrels
with ya brothers about toys, in high school about seats, girls. Going
up a bit, you have all these teens, gamers, tech geekers, shouting,
kicking, banning, in all sort of internet forums, irc chat rooms,
mailing lists, in-world gaming channels. Going up, you have managers
fighting in corporations, politicians pissing at each other, leaders
warring among nation states. Note the word PEER here, because, you are
out of the game with those who are much more powerful than you, and
similarly, you can't be bothered by those far beneath you.

Of course, the tech geekers all think they are fair, just, maintaining
peace. But you can almost see the smug on their faces whenever any of
these ?admins?, ?group owners?, ?sysops?, ?operators?, exercise their
power. It is a basic human pleasure to force onto uncooperative
others. (See: What Desires Are Politically Important?)

Serious fairness and open policies never actually come up unless the
community becomes large, larger then the original special interest
clique. Before the group becomes large, typically their political
structure is academically called oligarchy. i.e. basically whoever
started the group, his cronies, rule.

We all understand conscious power struggle. However, it is when we
think that we are not doing politics when exercising our power, is
when it is likely most damaging, with respect to human progress. (the
subject of human progress, its ideal direction, goal, is itself is
quite not agreed upon among historical figures (big philosophers,
politicians, leaders, etc.).)

Part of the problem is ignorance. Most tech geekers, those coders,
engineers, type of folks, typically don't have much education or
interest in social sciences. Few years ago on irc channel, i was
ranting on the subject of politics, due to some difference of opinion
on tech stuff, and learned, rather not surprisingly, that one of the
guy don't understand that politics essentially means power struggle.
Most tech geekers think that Politics is what politicians do, that it
is something about rulers, about bad ass evil lords, ambitious guys,
Napolean, or about controversial subjects, back stabbing, cloak and
dagger, and isn't about, say, admins or policies in some online forum.

--------------------
What Is Politics?

Here's some Wikipedia quotes from Politics:

    Politics is a process by which groups of people make collective
decisions. The term is generally applied to behavior within civil
governments, but politics has been observed in other group
interactions, including corporate, academic, and religious
institutions. It consists of "social relations involving authority or
power"[1] and refers to the regulation of a political unit,[2] and to
the methods and tactics used to formulate and apply policy.[3]

    ...

    Political science, the study of politics, examines the acquisition
and application of power and "power corrupts".

It quotes this juicy quote:

    ?Politics: A strife of interests masquerading as a contest of
principles. The conduct of public affairs for private advantage.? ?
Ambrose Bierce[15]

I much prefer older edits of Wikipedia's opening paragraph. Here's few
excerpts

    Politics consists of "social relations involving authority or
power"[1] and refers to the regulation of a political unit,[2] and to
the methods and tactics used to formulate and apply policy.[3]

    ...

    In a broader sense, any situation involving power, or any
maneouvring in order to enhance one's power or status within a group,
may be described as politics (e.g. office politics).[3] This form of
politics "is most associated with a struggle for ascendancy among
groups having different priorities and power relations."[4]

And here's a point-blank shot:

    Politics is who gets what, when, and how. ? Harold Lasswell

-------------------

the url for this essay can be found on my website or blog.

  Xah
? http://xahlee.org/

?


From gandalf at shopzeus.com  Mon Mar 15 03:38:34 2010
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Mon, 15 Mar 2010 08:38:34 +0100
Subject: sqlite savepoint problem [solved]
In-Reply-To: <1268608579.2846.34.camel@durian>
References: <mailman.752.1268596146.23598.python-list@python.org>	
	<87bpeqzmmv.fsf@castleamber.com> <4B99E358.4020507@shopzeus.com>	
	<1268600658.2846.17.camel@durian> <4B99EE05.8060505@shopzeus.com>
	<1268608579.2846.34.camel@durian>
Message-ID: <4B9DE3FA.2090904@shopzeus.com>


> Annotating your example:
>
>    # entering this context actually does nothing
>    with conn:
>       # a transaction is magically created before this statement
>       conn.execute("insert into a values (1)")
>       # and is implicitly committed before this statement
>       conn.execute("SAVEPOINT sp1")
>       # a new transaction is magically created
>       conn.execute("insert into a values (2)")
>       # and committed, discarding the first savepoint.
>       conn.execute("SAVEPOINT sp2")
>       # a new transaction is magically created
>       conn.execute("insert into a values (3)")
>       # and committed, discarding the very savepoint we are trying to use.
>       conn.execute("ROLLBACK TO sp2")
>       conn.execute("insert into a values (4)")
>       conn.execute("RELEASE sp1")
>    

We all know the Zen of Python. Explicit is better than implicit.

There is no point in using a savepoint outside a transaction. There is 
no point in using a savepoint if it commits all previous changes 
automatically.

Conclusion:

Sqlite's isolation_level is dark magic. It mixes real isolation levels 
with behaviour of context managers, and automagical commits in the wrong 
places.
Setting isolation_level=None is a must for anyone who want to do any 
serious work with sqlite.

    L





From Brian.Mingus at Colorado.EDU  Mon Mar 15 03:39:29 2010
From: Brian.Mingus at Colorado.EDU (Brian J Mingus)
Date: Mon, 15 Mar 2010 01:39:29 -0600
Subject: Hacker News, Xahlee.Org, and What is Politics?
In-Reply-To: <5b32bf8e-6adc-42a6-8a98-228b13e8a3f1@w9g2000prb.googlegroups.com>
References: <5b32bf8e-6adc-42a6-8a98-228b13e8a3f1@w9g2000prb.googlegroups.com>
Message-ID: <9839a05c1003150039j40cbe2bao16cf51ca431a1a0f@mail.gmail.com>

On Mon, Mar 15, 2010 at 1:16 AM, Xah Lee <xahlee at gmail.com> wrote:

> A essay related to the recent discussion of banning, and lisp
> associated group at ycombinator.com .


Is there some Python related issue I might help you out with? Or perhaps you
wish to provide Python assistance to someone on this list. Or perhaps you
would like to write some Python code, or read the friendly Python manual, or
draft a new PEP. Any one of these things would be a much better usage of
your time than drafting middle to high school quality essays.
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From davty216 at student.liu.se  Mon Mar 15 03:49:34 2010
From: davty216 at student.liu.se (David Tynnhammar)
Date: Mon, 15 Mar 2010 08:49:34 +0100
Subject: "Distributed" database in Python
Message-ID: <6da346621003150049h7c8901a2kf7dfb09db3ddf861@mail.gmail.com>

Greetings. I'm looking for a "distributed" database. (I'm not sure if
distributed is the correct terminology though).

My problem is this; I have a client application which once in a while
needs to sync with a central database. (And of course the client
-databases might be updated locally etc).

Are there any other resources you can recommend me? (I have basic RDMS
knowledge (MySQL)).


From kevin.p.dwyer at gmail.com  Mon Mar 15 03:50:09 2010
From: kevin.p.dwyer at gmail.com (Kev Dwyer)
Date: Mon, 15 Mar 2010 07:50:09 +0000 (UTC)
Subject: Is it possible to use re2 from Python?
References: <f853ea28-b236-4a17-8ded-43e5fe455d47@a18g2000yqc.googlegroups.com>
	<mailman.737.1268590742.23598.python-list@python.org>
	<0540f7d0-95f6-4b38-900d-dc25958ff232@g26g2000yqn.googlegroups.com>
Message-ID: <hnkorh$mv9$2@dough.gmane.org>

On Sun, 14 Mar 2010 14:40:34 -0700, _wolf wrote:

>> There's a recent thread about this on the python-dev list,
> 
> pointers? i searched but didn?t find anything.

http://mail.python.org/pipermail/python-dev/2010-March/098354.html



From ryan at rfk.id.au  Mon Mar 15 03:53:49 2010
From: ryan at rfk.id.au (Ryan Kelly)
Date: Mon, 15 Mar 2010 18:53:49 +1100
Subject: sqlite savepoint problem [solved]
In-Reply-To: <4B99FCCF.5080506@shopzeus.com>
References: <mailman.752.1268596146.23598.python-list@python.org>
	<87bpeqzmmv.fsf@castleamber.com> <4B99E358.4020507@shopzeus.com>
	<1268600658.2846.17.camel@durian> <4B99EE05.8060505@shopzeus.com>
	<4B99F1D1.2070202@shopzeus.com> <1268604831.2846.23.camel@durian>
	<4B99FCCF.5080506@shopzeus.com>
Message-ID: <1268639629.2846.48.camel@durian>

On Fri, 2010-03-12 at 09:35 +0100, Laszlo Nagy wrote:
> > No it doesn't.  The problem is that using a connection as a context
> > manager doesn't do what you think. 
> >
> > It does *not* start a new transaction on __enter__ and commit it on
> > __exit__.  As far as I can tell it does nothing on __enter__ and calls
> > con.commit() or con.rollback() on exit.  With isolation_level=None,
> > these are no-ops.
> >   
> Thank you Ryan! You are abolutely right, and thank you for reading the 
> source.  Now everything works as I imagined.

No problemo - isolation_level has given me my fair share of headaches in
the past, so I couldn't resist the opportunity to understand it a little
better.

> The way the context manager and isolation_level works looks very very 
> strange to me. Here is a demonstration:
> 
> import sqlite3
> def getconn():
>     conn = sqlite3.connect(':memory:')
>     conn.isolation_level = None
>     return conn
> def main():
>     with getconn() as conn:
>         conn.execute("create table a ( i integer ) ")
>     try:
>         conn.execute("insert into a values (1)")
>         with conn:
>             conn.execute("insert into a values (2)")
>             raise Exception
>     except:
>         print "There was an error"
>     for row in conn.execute("select * from a"):
>         print row
> main()
> 
> 
> Output:
> 
> There was an error
> (1,)
> (2,)
>
> 
> Looks like the context manager did not roll back anything.

Yes, because there were no transactions created so there was nothing to
roll back.

>  If I remove 
> isolation_level=None then I get this:
> 
> There was an error
> 
> E.g. the context manager rolled back something that was executed outside 
> the context. 

Yes, because the transactions created by the default isolation level do
not nest, so the rollback happens at outermost scope.

> I cannot argue with the implementation - it is that way. 
> But this is not what I would expect. I believe I'm not alone with this.

That's at least two of us :-)

> Just for clarity, we should put a comment at the end of the 
> documentation here:
> 
> http://docs.python.org/library/sqlite3.html#sqlite3-controlling-transactions
> 
> I would add at least these things:
> 
> #1. By using isolation_level = None, connection objects (used as a 
> context manager) WON'T automatically commit or rollback transactions.
> #2. Using any isolation level, connection objects WON'T automatically 
> begin a transaction.
> #3. Possibly, include your connection manager class code, to show how to 
> do it "the expected" way.
> 
> Also one should clarify in the documentation, what isolation_level does. 
> Looks like setting isolation_level to None is not really an "auto commit 
> mode". It is not even part of sqlite itself. It is part of the python 
> extension.

I think of it as almost the opposite - you have to set
isolation_level=None to get the unadulterated behaviour of the
underlying sqlite library. 

I'm sure the devs would appreciate a documentation patch (submission
details at http://python.org/dev/patches/).  I'm also pretty confident
that I won't have time to do one up anytime soon :-)


 Good luck with your project!


     Ryan

-- 
Ryan Kelly
http://www.rfk.id.au  |  This message is digitally signed. Please visit
ryan at rfk.id.au        |  http://www.rfk.id.au/ramblings/gpg/ for details

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From steven at REMOVE.THIS.cybersource.com.au  Mon Mar 15 04:01:02 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 15 Mar 2010 08:01:02 GMT
Subject: "Distributed" database in Python
References: <mailman.776.1268639376.23598.python-list@python.org>
Message-ID: <pan.2010.03.15.08.01.01@REMOVE.THIS.cybersource.com.au>

On Mon, 15 Mar 2010 08:49:34 +0100, David Tynnhammar wrote:

> Greetings. I'm looking for a "distributed" database. (I'm not sure if
> distributed is the correct terminology though).
> 
> My problem is this; I have a client application which once in a while
> needs to sync with a central database. (And of course the client
> -databases might be updated locally etc).
> 
> Are there any other resources you can recommend me? (I have basic RDMS
> knowledge (MySQL)).

Google and Wikipedia are your friends.

http://en.wikipedia.org/wiki/Distributed_database
http://www.google.com/search?q=distributed+database
http://www.google.com/search?q=python+distributed+database


If you have already tried this, then you should say so, so that we don't 
waste our time, and yours, going over ground you have already covered.



-- 
Steven


From mail at timgolden.me.uk  Mon Mar 15 04:41:10 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Mon, 15 Mar 2010 08:41:10 +0000
Subject: dll in project?
In-Reply-To: <bc7f680c1003142043y78505aa3jb5e70360a692ebc8@mail.gmail.com>
References: <bc7f680c1003142043y78505aa3jb5e70360a692ebc8@mail.gmail.com>
Message-ID: <4B9DF2A6.70608@timgolden.me.uk>

On 15/03/2010 03:43, Alex Hall wrote:
> I have a dll I am trying to use, but I get a Windows error 126, "the
> specified module could not be found". Here is the code segment:
> nvdaController=ctypes.windll.LoadLibrary("nvdaControllerClient32.dll") 	
>
> I have the specified dll file in the same directory as the file trying
> to use said dll

The DLL search path:

http://msdn.microsoft.com/en-us/library/7d83bc18%28VS.80%29.aspx

includes the directory which holds the executable for the current prcoess;
it include the current directory; and it includes other things which I
doubt apply here.

But it doesn't include (if I may be permitted a little well-intentioned
ridicule) the directory where the current Python module is stored.
In other words: what does os.getcwd () return?

TJG


From mick.lausch at gmail.com  Mon Mar 15 04:43:02 2010
From: mick.lausch at gmail.com (Michael.Lausch)
Date: Mon, 15 Mar 2010 01:43:02 -0700 (PDT)
Subject: staticmethod and setattr
Message-ID: <a38bb46a-7a0d-4cc6-8cea-650e939eaa33@t20g2000yqe.googlegroups.com>

Hi,

I managed to get confused by Python, which is not such an easy task.

The problem i have is rooted in marshalling, JSON and Dojo.
I need some static class in function with the name "$ref"
i tried:
class Foo(object):
    @staticmethod
    def _ref(o):
         pass

setattr(Foo, "$ref", Foo._ref)

but when i do something like this in code:

class B(object):
    pass
b = Bar
f = Foo.getattr("$ref")
f(b)

if get the following error
ypeError
unbound method _ref() must be called with Foo instance as first
argument (got Bar instance instead)

I managed to impelemnt it with a unbound, "normal" _ref() function,
but i want one _ref function per
class, because they are a little bit different for each class.

One aproach which i have not tried is:
setattr(Foo, "$ref", Foo._ref.im_func).
maybe this works, but i think this is not a clean aproach.
Any ideas?






From breamoreboy at yahoo.co.uk  Mon Mar 15 04:46:31 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Mon, 15 Mar 2010 08:46:31 +0000
Subject: iterator/generator
In-Reply-To: <db51dbb8-920a-405a-8ddc-2a734f7140ac@q21g2000yqm.googlegroups.com>
References: <db51dbb8-920a-405a-8ddc-2a734f7140ac@q21g2000yqm.googlegroups.com>
Message-ID: <hnks56$k3i$1@dough.gmane.org>

vsoler wrote:
> I am working on a script that reads data from an excel workbook. The
> data is located in a named range whose first row contains the headers.
> It works!!!  I find it superb that python is able to do such things!!!
> 
> Now my questions.
> 
> a. My ranges can in practice be quite big, and although I am happy
> with the speed I get, because I am learning python, I think I could do
> it still a bit better. I think that the line   for i in matriz[1:]:
> could be improved with an iterator/generator, but I am not quite
> certain how I should proceed.

I write this :-
for j, i in enumerate(matriz):
     if j:
         etc...

If there's a better method for some definition of better I'm certain 
we'll quickly get told.

Please see the python docs for the enumerate built-in.

HTH.

Mark Lawrence.

[snip the rest]



From rantingrick at gmail.com  Mon Mar 15 04:55:33 2010
From: rantingrick at gmail.com (rantingrick)
Date: Mon, 15 Mar 2010 01:55:33 -0700 (PDT)
Subject: Hacker News, Xahlee.Org, and What is Politics?
References: <5b32bf8e-6adc-42a6-8a98-228b13e8a3f1@w9g2000prb.googlegroups.com>
Message-ID: <e0b21712-15af-49cd-b01c-d6135d0cdf4a@q21g2000yqm.googlegroups.com>


Bravo!, Bravo!

A wonderful post xah, thanks for sharing and i hope it sinks in with
the people around here who need a lesson in humility. I was just a few
days ago feeling quite passionate about this subject and creating my
own draft but than i lost interest because i knew nobody would even
care and probably just accuse me of trolling. Anyhow thanks for this!


From robin at reportlab.com  Mon Mar 15 05:58:59 2010
From: robin at reportlab.com (Robin Becker)
Date: Mon, 15 Mar 2010 09:58:59 +0000
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
In-Reply-To: <4B9A9624.7040200@v.loewis.de>
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>	<mailman.619.1268324988.23598.python-list@python.org>	<4B992FB5.8090207@v.loewis.de>	<4B9A2810.9030602@chamonix.reportlab.co.uk>	<4B9A614C.1080105@chamonix.reportlab.co.uk>
	<4B9A9624.7040200@v.loewis.de>
Message-ID: <4B9E04E3.90408@chamonix.reportlab.co.uk>

On 12/03/2010 19:29, "Martin v. L?wis" wrote:
>> Not sure if this is a bug
>
> I think it is. It seems that the cross-build support in msvc9compiler
> has been tested only in a build tree of Python (where there is no Libs
> directory).

This minor patch seems to fix the problem for me (using a PCBuild folder 
parallel to libs)

C:\Python\Lib\distutils\command>diff build_ext.py.orig build_ext.py
207c207,209
<                 self.library_dirs.append(new_lib)
---
 >                     self.library_dirs.insert(0,new_lib)
 >                 else:
 >                     self.library_dirs.append(new_lib)

>
> For released copies of Python, I could change that to distribute the
> AMD64 pythonXY.lib in libs/amd64. [FWIW, I'm still puzzled why I ship
> the import libraries of all the pyd files as well - I can't see a reason
> other than tradition]. Then, distutils should change to look it up there.
.......

Just checked and all the pyd's seem only to export the xxx_init functions 
(sometimes there are two in the pyd) so the .libs do seem a bit redundant.

-- 
Robin Becker



From eckhardt at satorlaser.com  Mon Mar 15 06:14:31 2010
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Mon, 15 Mar 2010 11:14:31 +0100
Subject: dll in project?
References: <mailman.770.1268624619.23598.python-list@python.org>
Message-ID: <7td177-uar.ln1@satorlaser.homedns.org>

Alex Hall wrote:
> I have a dll I am trying to use, but I get a Windows error 126, "the
> specified module could not be found". Here is the code segment:
> nvdaController=ctypes.windll.LoadLibrary("nvdaControllerClient32.dll")

In addition to Alf's answer, this can also happen when the OS can't find
another DLL that this one depends on.

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From greg.ewing at canterbury.ac.nz  Mon Mar 15 06:29:51 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Mon, 15 Mar 2010 23:29:51 +1300
Subject: Reverse engineering CRC?
In-Reply-To: <kz88du.hk0@spenarnc.xs4all.nl>
References: <7vj7fdFnnjU1@mid.individual.net> <kz88du.hk0@spenarnc.xs4all.nl>
Message-ID: <4B9E0C1F.9020003@canterbury.ac.nz>

I've solved the problem now.

It turned out to be a very standard CRC algorithm, complicated
by the presence of a few extra bytes of data being checked that
didn't appear explicitly in the file anywhere.

In the process I developed some very general techniques for
solving this kind of problem, which I've written about here
if anyone's interested:

http://www.cosc.canterbury.ac.nz/greg.ewing/essays/CRC-Reverse-Engineering.html

Thanks for everyone's help,
Greg


From steve at REMOVE-THIS-cybersource.com.au  Mon Mar 15 06:40:31 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 15 Mar 2010 10:40:31 GMT
Subject: staticmethod and setattr
References: <a38bb46a-7a0d-4cc6-8cea-650e939eaa33@t20g2000yqe.googlegroups.com>
Message-ID: <4b9e0e9f$0$27822$c3e8da3@news.astraweb.com>

On Mon, 15 Mar 2010 01:43:02 -0700, Michael.Lausch wrote:

> Hi,
> 
> I managed to get confused by Python, which is not such an easy task.
> 
> The problem i have is rooted in marshalling, JSON and Dojo. I need some
> static class in function with the name "$ref" i tried:
> class Foo(object):
>     @staticmethod
>     def _ref(o):
>          pass
> 
> setattr(Foo, "$ref", Foo._ref)

That doesn't work as expected:

>>> Foo.__dict__['_ref'] is Foo.__dict__['$ref']
False


Try this instead:

>>> setattr(Foo, "$ref", Foo.__dict__['_ref'])
>>> Foo.__dict__['_ref'] is Foo.__dict__['$ref']
True




-- 
Steven


From efiish at gmail.com  Mon Mar 15 06:57:38 2010
From: efiish at gmail.com (Lan Qing)
Date: Mon, 15 Mar 2010 18:57:38 +0800
Subject: File existence check with partial filename
In-Reply-To: <hnkcqh$avd$1@news.eternal-september.org>
References: <C7C2FE43.5AB0%Sang-Ho.Yun@jpl.nasa.gov>
	<hnkcqh$avd$1@news.eternal-september.org>
Message-ID: <ee9ad2071003150357y448f2ccej80462f35910d08e2@mail.gmail.com>

Or use the regular module:

import re
import os

for filename in os.listdir('.'):
    if re.match("*HV*", filename):
          # do something with the file

On Mon, Mar 15, 2010 at 12:24 PM, Alf P. Steinbach <alfps at start.no> wrote:

> * Sang-Ho Yun:
>
>  I learned that I can check the existence of a file using
>> os.path.isfile("filename").
>>
>> What if I need to check if there is a file that contains "HV" in the
>> filename?  What should I do?
>>
>
> <code>
>    from __future__ import print_function
>    import os

   for filename in os.listdir( "." ):
>        if "HV" in filename.upper():
>            print( filename )
> </code>
>
>
> Cheers & hth.,
>
> - Alf
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From mehgcap at gmail.com  Mon Mar 15 07:28:11 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Mon, 15 Mar 2010 07:28:11 -0400
Subject: dll in project?
In-Reply-To: <7td177-uar.ln1@satorlaser.homedns.org>
References: <mailman.770.1268624619.23598.python-list@python.org>
	<7td177-uar.ln1@satorlaser.homedns.org>
Message-ID: <bc7f680c1003150428w3cfea439vb1990885a3c8eff3@mail.gmail.com>

On 3/15/10, Ulrich Eckhardt <eckhardt at satorlaser.com> wrote:
> Alex Hall wrote:
>> I have a dll I am trying to use, but I get a Windows error 126, "the
>> specified module could not be found". Here is the code segment:
>> nvdaController=ctypes.windll.LoadLibrary("nvdaControllerClient32.dll")
>
> In addition to Alf's answer, this can also happen when the OS can't find
> another DLL that this one depends on.

Well, os.getcwd() returns "c:\python26", not my program's directory.
However, I changed the reference to the dll to be
helpers.progdir+'\\nvdaControllerClient32.dll'
and still no luck! helpers.progdir is a var holding the top-level
directory of my project, using os.path. Again, using this more precise
reference still fails, triggering my except statement in my try/catch
loop.


From alfps at start.no  Mon Mar 15 07:37:55 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Mon, 15 Mar 2010 12:37:55 +0100
Subject: dll in project?
In-Reply-To: <mailman.785.1268652497.23598.python-list@python.org>
References: <mailman.770.1268624619.23598.python-list@python.org>	<7td177-uar.ln1@satorlaser.homedns.org>
	<mailman.785.1268652497.23598.python-list@python.org>
Message-ID: <hnl66n$5vr$1@news.eternal-september.org>

* Alex Hall:
> On 3/15/10, Ulrich Eckhardt <eckhardt at satorlaser.com> wrote:
>> Alex Hall wrote:
>>> I have a dll I am trying to use, but I get a Windows error 126, "the
>>> specified module could not be found". Here is the code segment:
>>> nvdaController=ctypes.windll.LoadLibrary("nvdaControllerClient32.dll")
>> In addition to Alf's answer, this can also happen when the OS can't find
>> another DLL that this one depends on.
> 
> Well, os.getcwd() returns "c:\python26", not my program's directory.
> However, I changed the reference to the dll to be
> helpers.progdir+'\\nvdaControllerClient32.dll'
> and still no luck!

Are you sure you get a single directory separator backslash there?

I suggest using the os.path 'join' function, whatever it was called.


> helpers.progdir is a var holding the top-level
> directory of my project, using os.path.

But is that where the DLL resides, or is it in some subdirectory?


> Again, using this more precise
> reference still fails, triggering my except statement in my try/catch
> loop.

Try also checking the arguments & documentation of ctypes.windll.LoadLibrary. I 
know, you probably already done that. But I mention it just in case (I'm not 
familiar with that function at the Python level, so don't know about the args).


Cheers & hth.,

- Alf


From eckhardt at satorlaser.com  Mon Mar 15 07:44:18 2010
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Mon, 15 Mar 2010 12:44:18 +0100
Subject: dll in project?
References: <mailman.770.1268624619.23598.python-list@python.org>
	<7td177-uar.ln1@satorlaser.homedns.org>
	<mailman.785.1268652497.23598.python-list@python.org>
Message-ID: <i5j177-2kr.ln1@satorlaser.homedns.org>

Alex Hall wrote:
> On 3/15/10, Ulrich Eckhardt <eckhardt at satorlaser.com> wrote:
>> Alex Hall wrote:
>>> I have a dll I am trying to use, but I get a Windows error 126, "the
>>> specified module could not be found". Here is the code segment:
>>> nvdaController=ctypes.windll.LoadLibrary("nvdaControllerClient32.dll")
>>
>> In addition to Alf's answer, this can also happen when the OS can't find
>> another DLL that this one depends on.

Did you check if this could be the case?

> Well, os.getcwd() returns "c:\python26", not my program's directory.
> However, I changed the reference to the dll to be
> helpers.progdir+'\\nvdaControllerClient32.dll'
> and still no luck!

Generally, there is os.path.join() IIRC which does this portably. This
probably doesn't matter though. What I would check is firstly if this file
could be opened at all, e.g. using os.stat().

> helpers.progdir is a var holding the top-level directory of my
> project, using os.path.

Huh? In what way using os.path?

> Again, using this more precise reference still fails, triggering my
> except statement in my try/catch loop.

Same error? See my initial guess! As a tool for finding out if there are
missing dependencies, take a look at http://dependencywalker.com

BTW: No need to CC me, I read your initial request here, I can ready any
follow-ups here, too. ;)

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From iwanttobeabadger at googlemail.com  Mon Mar 15 08:21:42 2010
From: iwanttobeabadger at googlemail.com (Nathan Harmston)
Date: Mon, 15 Mar 2010 12:21:42 +0000
Subject: Large regular expressions
Message-ID: <b32951aa1003150521s22d1642cvbb78062f1fe3ed59@mail.gmail.com>

Hi,

So I m trying to use a very large regular expression, basically I have
a list of items I want to find in text, its kind of a conjunction of
two regular expressions and a big list......not pretty. However
everytime I try to run my code I get this exception:

OverflowError: regular expression code size limit exceeded

I understand that there is a Python imposed limit on the size of the
regular expression. And although its not nice I have a machine with
12Gb of RAM just waiting to be used, is there anyway I can alter
Python to allow big regular expressions?

Could anyone suggest other methods of these kind of string matching in
Python? I m trying to see if my swigged alphabet trie is faster than
whats possible in Python!

Many thanks,


Nathan


From mick.lausch at gmail.com  Mon Mar 15 08:42:01 2010
From: mick.lausch at gmail.com (Michael.Lausch)
Date: Mon, 15 Mar 2010 05:42:01 -0700 (PDT)
Subject: staticmethod and setattr
References: <a38bb46a-7a0d-4cc6-8cea-650e939eaa33@t20g2000yqe.googlegroups.com>
	<4b9e0e9f$0$27822$c3e8da3@news.astraweb.com>
Message-ID: <43208240-720b-40ff-9f41-b8a5a0c69246@g10g2000yqh.googlegroups.com>

On Mar 15, 11:40?am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Mon, 15 Mar 2010 01:43:02 -0700, Michael.Lausch wrote:
> > Hi,
>
> > I managed to get confused by Python, which is not such an easy task.
>
> > The problem i have is rooted in marshalling, JSON and Dojo. I need some
> > static class in function with the name "$ref" i tried:
> > class Foo(object):
> > ? ? @staticmethod
> > ? ? def _ref(o):
> > ? ? ? ? ?pass
>
> > setattr(Foo, "$ref", Foo._ref)
>
> That doesn't work as expected:
>
> >>> Foo.__dict__['_ref'] is Foo.__dict__['$ref']
>
> False
>
> Try this instead:
>
> >>> setattr(Foo, "$ref", Foo.__dict__['_ref'])
> >>> Foo.__dict__['_ref'] is Foo.__dict__['$ref']
>
> True

Now I'm trying to understand why this is the case.
How is Foo.__dict__['_ref']  different from Foo._ref?
Shouldn't it return the same attribute?

And after further experiments i found out that a making
Foo._ref a classmethod does work with my first approach.



From stefan_ml at behnel.de  Mon Mar 15 08:45:31 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Mon, 15 Mar 2010 13:45:31 +0100
Subject: Large regular expressions
In-Reply-To: <b32951aa1003150521s22d1642cvbb78062f1fe3ed59@mail.gmail.com>
References: <b32951aa1003150521s22d1642cvbb78062f1fe3ed59@mail.gmail.com>
Message-ID: <hnla5b$5gs$1@dough.gmane.org>

Nathan Harmston, 15.03.2010 13:21:
> So I m trying to use a very large regular expression, basically I have
> a list of items I want to find in text, its kind of a conjunction of
> two regular expressions and a big list......not pretty. However
> everytime I try to run my code I get this exception:
>
> OverflowError: regular expression code size limit exceeded
>
> I understand that there is a Python imposed limit on the size of the
> regular expression. And although its not nice I have a machine with
> 12Gb of RAM just waiting to be used, is there anyway I can alter
> Python to allow big regular expressions?
>
> Could anyone suggest other methods of these kind of string matching in
> Python?

If what you are trying to match is in fact a set of strings instead of a 
set of regular expressions, you might find this useful:

http://pypi.python.org/pypi/acora

Stefan



From alain at dpt-info.u-strasbg.fr  Mon Mar 15 08:50:27 2010
From: alain at dpt-info.u-strasbg.fr (Alain Ketterlin)
Date: Mon, 15 Mar 2010 13:50:27 +0100
Subject: Large regular expressions
References: <mailman.786.1268655707.23598.python-list@python.org>
Message-ID: <877hpdycj0.fsf@dpt-info.u-strasbg.fr>

Nathan Harmston <iwanttobeabadger at googlemail.com> writes:

[...]
> Could anyone suggest other methods of these kind of string matching in
> Python? I m trying to see if my swigged alphabet trie is faster than
> whats possible in Python!

Since you mention using a trie, I guess it's just a big alternative of
fixed strings. You may want to try using the Aho-Corasick variant. It
looks like there are several implementations (google finds at least
two). I would be surprised if any pure python solution were faster than
tries implemented in C. Don't forget to tell us your findings.

-- Alain.


From mehgcap at gmail.com  Mon Mar 15 09:24:01 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Mon, 15 Mar 2010 09:24:01 -0400
Subject: dll in project?
In-Reply-To: <i5j177-2kr.ln1@satorlaser.homedns.org>
References: <mailman.770.1268624619.23598.python-list@python.org>
	<7td177-uar.ln1@satorlaser.homedns.org>
	<mailman.785.1268652497.23598.python-list@python.org>
	<i5j177-2kr.ln1@satorlaser.homedns.org>
Message-ID: <bc7f680c1003150624s7cf6710dm41a4a91d21e88d4c@mail.gmail.com>

Okay, I got a new copy and all seems well now. The dll is found and
loaded. The functions inside the dll are not working, but that is not
Python's fault. Thanks to everyone for your help and suggestions!

On 3/15/10, Ulrich Eckhardt <eckhardt at satorlaser.com> wrote:
> Alex Hall wrote:
>> On 3/15/10, Ulrich Eckhardt <eckhardt at satorlaser.com> wrote:
>>> Alex Hall wrote:
>>>> I have a dll I am trying to use, but I get a Windows error 126, "the
>>>> specified module could not be found". Here is the code segment:
>>>> nvdaController=ctypes.windll.LoadLibrary("nvdaControllerClient32.dll")
>>>
>>> In addition to Alf's answer, this can also happen when the OS can't find
>>> another DLL that this one depends on.
>
> Did you check if this could be the case?
>
>> Well, os.getcwd() returns "c:\python26", not my program's directory.
>> However, I changed the reference to the dll to be
>> helpers.progdir+'\\nvdaControllerClient32.dll'
>> and still no luck!
>
> Generally, there is os.path.join() IIRC which does this portably. This
> probably doesn't matter though. What I would check is firstly if this file
> could be opened at all, e.g. using os.stat().
>
>> helpers.progdir is a var holding the top-level directory of my
>> project, using os.path.
>
> Huh? In what way using os.path?
>
>> Again, using this more precise reference still fails, triggering my
>> except statement in my try/catch loop.
>
> Same error? See my initial guess! As a tool for finding out if there are
> missing dependencies, take a look at http://dependencywalker.com
>
> BTW: No need to CC me, I read your initial request here, I can ready any
> follow-ups here, too. ;)
>
> Uli
>
> --
> Sator Laser GmbH
> Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From catonano at gmail.com  Mon Mar 15 09:41:14 2010
From: catonano at gmail.com (catonano)
Date: Mon, 15 Mar 2010 06:41:14 -0700 (PDT)
Subject: Dreaming of new generation IDE
References: <mailman.1825.1265195427.28905.python-list@python.org> 
	<c4a84929-a6af-4281-8e29-7fd3eaa90eb0@m16g2000yqc.googlegroups.com> 
	<5b51740d-11f1-4f01-b51c-d1b6ea161eb7@l19g2000yqb.googlegroups.com>
Message-ID: <f4ee1b0b-c69a-4938-b4eb-2389acead449@g28g2000yqh.googlegroups.com>

Hello again, people

On Feb 11, 6:30?pm, Francis Carr <coldtort... at gmail.com> wrote:
> > I can't believe the code editing situation today is in a such sorry
> > state.
>
> I can't believe an old coder is feeling so sorry for himself.

Ok, I'm feeling sorry; still, I think I made a point.


> > Today, I tried to understand the twisted.web.client code and I found 3
> Maybe the relevant lesson to be taken from Smalltalk is *not*
> ? "put it all in one image"
> but instead
> ? "write code to solve problems, e.g., reading code"


> I suggest defining a few shell functions to *automate* the search, for
> example in zsh
>
> function allf () {

> Smalltalk's images are cool. ?But they are such a huge hammer, and
> they impose so many additional requirements! ?The costs outweigh the
> cool.

Francis, I disagree on the final balance statement about the Smalltalk
images and I thank you for your suggestions on how to use grep and
shell scripting.

I also have no problem to admit I was feeling sorry for myself.

But today I found something I think is relevant to this thread.

It's here:
http://www.cs.brown.edu/people/acb/codebubbles_site.htm

it's about a IDE for Java called Bubbles.

It sports a zooming interface and the MAIN idea it proposes, in my
opinion, is that the code is NOT thought as files content, rather as
fragments, called bubbles.

And then you arrange your bubbles in a 2d space a little bit like in a
videogame.

I think it's very similar to the Smalltalk image thing (as a concept,
if not as an implementation), with its live things and direct
manipulation.

If you open the footage directly in youtube, you can go to some
"related" footages about a similar thing made by Microsoft that of
course ditches the main idea retaining the concept of files and
directories, overlapping the concept of files and classes (sigh).

I didn't imagine such a research existed and the discovery confirms to
me that the bother I indicated in this thread is somewhat shared by
someone, around the world.

As for my feelings, I swear I'm taking care of them in a way that
doesn't involve bothering anyone on any newsgroup ;-)

Steve, does Bubble gets any closer to your vision than the "ugly"
Smalltalk thing ?

Bye
Catonano


From alex at moreati.org.uk  Mon Mar 15 09:50:32 2010
From: alex at moreati.org.uk (Alex Willmer)
Date: Mon, 15 Mar 2010 06:50:32 -0700 (PDT)
Subject: Understanding the CPython dict implementation
References: <mailman.768.1268610003.23598.python-list@python.org> 
	<4b9dadc4$0$1639$742ec2ed@news.sonic.net>
Message-ID: <f0343a45-46a8-4352-bd06-a2ef6f2ab81c@r27g2000yqn.googlegroups.com>

On Mar 15, 4:06?am, John Nagle <na... at animats.com> wrote:
> ? ? Is this available as a paper?
>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? John Nagle

It doesn't wppear to be, slides are here:

http://us.pycon.org/2010/conference/schedule/event/12/

Alex


From bruno.42.desthuilliers at websiteburo.invalid  Mon Mar 15 09:51:30 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Mon, 15 Mar 2010 14:51:30 +0100
Subject: staticmethod and setattr
In-Reply-To: <43208240-720b-40ff-9f41-b8a5a0c69246@g10g2000yqh.googlegroups.com>
References: <a38bb46a-7a0d-4cc6-8cea-650e939eaa33@t20g2000yqe.googlegroups.com>
	<4b9e0e9f$0$27822$c3e8da3@news.astraweb.com>
	<43208240-720b-40ff-9f41-b8a5a0c69246@g10g2000yqh.googlegroups.com>
Message-ID: <4b9e3b61$0$12084$426a34cc@news.free.fr>

Michael.Lausch a ?crit :
(snip)


> Now I'm trying to understand why this is the case.
> How is Foo.__dict__['_ref']  different from Foo._ref?
> Shouldn't it return the same attribute?
> 

It's an application of the descriptor protocol:

http://wiki.python.org/moin/FromFunctionToMethod


From andreas.loescher at s2005.tu-chemnitz.de  Mon Mar 15 10:24:55 2010
From: andreas.loescher at s2005.tu-chemnitz.de (Andreas =?ISO-8859-1?Q?L=F6scher?=)
Date: Mon, 15 Mar 2010 15:24:55 +0100
Subject: staticmethod and setattr
In-Reply-To: <43208240-720b-40ff-9f41-b8a5a0c69246@g10g2000yqh.googlegroups.com>
Message-ID: <1268663020.10067.35.camel@laptop>

Am Montag, den 15.03.2010, 05:42 -0700 schrieb Michael.Lausch:
> On Mar 15, 11:40 am, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
> > On Mon, 15 Mar 2010 01:43:02 -0700, Michael.Lausch wrote:
> > > Hi,
> >
> > > I managed to get confused by Python, which is not such an easy task.
> >
> > > The problem i have is rooted in marshalling, JSON and Dojo. I need some
> > > static class in function with the name "$ref" i tried:
> > > class Foo(object):
> > >     @staticmethod
> > >     def _ref(o):
> > >          pass
> >
> > > setattr(Foo, "$ref", Foo._ref)
> >
> > That doesn't work as expected:
> >
> > >>> Foo.__dict__['_ref'] is Foo.__dict__['$ref']
> >
> > False
> >
> > Try this instead:
> >
> > >>> setattr(Foo, "$ref", Foo.__dict__['_ref'])
> > >>> Foo.__dict__['_ref'] is Foo.__dict__['$ref']
> >
> > True
> 
> Now I'm trying to understand why this is the case.
> How is Foo.__dict__['_ref']  different from Foo._ref?
> Shouldn't it return the same attribute?
> 
> And after further experiments i found out that a making
> Foo._ref a classmethod does work with my first approach.
> 

In the class dictionary are the "raw" objects stored. For example:

class Spam:
    @staticmethod
    def egg1():
        pass
    def egg2(self):
        pass

>>> Spam.__dict__
{'egg1': <staticmethod object at 0x7f0b03240b40>, '__module__':
'__main__', 'egg2': <function egg2 at 0x7f0b0432a2a8>, '__doc__': None}

If you try to call egg1 as staticmethod you will get an error:
>>> Spam.__dict__['egg1']()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'staticmethod' object is not callable

getattr() is not only a shortcut for the line above. It searches all
base classes for the specified name in the class dictionaries. If the
name is found, and the object has an additional descriptor, it is
applied on the object itself.

In case of an static method, the descriptor sm_descr_get is located in
Objects/funcobjects.c of the sources and it retriefes the encapsuled
callable, which in this case is the function egg1.

If you now set the function as new attribute, it is no longer a static
method, but a normal function. If a function is retrieved via getattr(),
it is encapsuled in an method object. (func_descr_get in the same file)
If you now try to call the method in you example, you call a method from
a class. This results in an unbound method, which requests an instance
of the class as first agument. 

I hope this clears some things up.

Best
Andreas



From gdamjan at gmail.com  Mon Mar 15 10:53:21 2010
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Mon, 15 Mar 2010 15:53:21 +0100
Subject: Python for newbies (Pythno users group in Macedonia)
References: <hpgq67-gai.ln1@archaeopteryx.softver.org.mk>
	<mailman.702.1268486707.23598.python-list@python.org>
Message-ID: <28u177-m9j.ln1@archaeopteryx.softver.org.mk>

> If you are all English-speakers then perhaps you could consider
> showing a PyCon video - see
> 
>   http://pycon.blip.tv

That's certainly something I'm considering for the more advanced users

> Good luck with the group. I hope to see PyCon Macedonia emerging
> before too long!

Thanks :)
I guess we'd have to wait a decade or so for a PyCon here 

-- 
damjan


From gdamjan at gmail.com  Mon Mar 15 11:05:31 2010
From: gdamjan at gmail.com (=?UTF-8?B?0JTQsNC80ZjQsNC9INCT0LXQvtGA0LPQuNC10LLRgdC60Lg=?=)
Date: Mon, 15 Mar 2010 16:05:31 +0100
Subject: Python for newbies (Pythno users group in Macedonia)
References: <hpgq67-gai.ln1@archaeopteryx.softver.org.mk>
	<mailman.719.1268515208.23598.python-list@python.org>
Message-ID: <ruu177-gcj.ln1@archaeopteryx.softver.org.mk>

>> we are starting with bi-monthly Python User Group meetings in Skopje,
>> Macedonia. The meetings are targeted for both beginners and more
>> experienced users.
>>   
> ...
> http://us.pycon.org/2010/conference/schedule/event/108/

Great resource, exactly what I needed.

So, they use this book http://www.greenteapress.com/thinkpython/ as a 
guide, seems like a good choice.

I also learned about the tutor mail list:
http://mail.python.org/mailman/listinfo/tutor


-- 
damjan


From alex at moreati.org.uk  Mon Mar 15 11:42:40 2010
From: alex at moreati.org.uk (Alex Willmer)
Date: Mon, 15 Mar 2010 08:42:40 -0700 (PDT)
Subject: EuroPython 2010 - Open for registration and reminder of participation
Message-ID: <a3c094b1-5958-467d-8e2e-a82ecffbe05f@g4g2000yqa.googlegroups.com>

EuroPython 2010 - 17th to 24th July 2010
----------------------------------------

EuroPython is a conference for the Python programming language
community, including the Django, Zope and Plone communities. It is
aimed at everyone in the Python community, of all skill levels, both
users and programmers.

Last year's conference was the largest open source conference in the
UK and one of the largest community organised software conferences in
Europe.

This year EuroPython will be held from the 17th to 24th July in
Birmingham, UK. It will include over 100 talks, tutorials, sprints and
social events.

Registration
------------

Registration is open now at: http://www.europython.eu/registration/

For the best registration rates, book as soon as you can! Extra Early
Bird closes soon, after which normal Early Bird rate will apply until
10th May

Talks, Activities and Events
----------------------------

Do you have something you wish to present at EuroPython? You want to
give a talk, run a tutorial or sprint?

Go to http://www.europython.eu/talks/cfp/ for information and advice!
Go to http://wiki.europython.eu/Sprints to plan a sprint!

Help Us Out
-----------

EuroPython is run by volunteers, like you! We could use a hand, and
any contribution is welcome.

Go to http://wiki.europython.eu/Helping to join us!
Go to http://www.europython.eu/contact/ to contact us directly!

Sponsors
--------

Sponsoring EuroPython is a unique opportunity to affiliate with this
prestigious conference and to reach a large number of Python users
from computing professionals to academics, from entrepreneurs to
motivated and well-educated job seekers.

http://www.europython.eu/sponsors/

Spread the Word
---------------

We are a community-run not-for-profit conference. Please help to
spread the word by distributing this announcement to colleagues,
project mailing lists, friends, your blog, Web site, and through your
social networking connections. Take a look at our publicity resources:

http://wiki.europython.eu/Publicity

General Information
-------------------

For more information about the conference, please visit the official
site: http://www.europython.eu/

Looking forward to see you!

The EuroPython Team


From python at mrabarnett.plus.com  Mon Mar 15 11:44:43 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Mon, 15 Mar 2010 15:44:43 +0000
Subject: File existence check with partial filename
In-Reply-To: <ee9ad2071003150357y448f2ccej80462f35910d08e2@mail.gmail.com>
References: <C7C2FE43.5AB0%Sang-Ho.Yun@jpl.nasa.gov>	<hnkcqh$avd$1@news.eternal-september.org>
	<ee9ad2071003150357y448f2ccej80462f35910d08e2@mail.gmail.com>
Message-ID: <4B9E55EB.7080802@mrabarnett.plus.com>

Lan Qing wrote:
> Or use the regular module:
> 
> import re
> import os
> 
> for filename in os.listdir('.'):
>     if re.match("*HV*", filename):
>           # do something with the file
> 
The regular expression should be ".*HV.*", although:

     re.search("HV", filename)

would be better and:

     "HV" in filename.upper()

would be even better, as Alf posted.

> On Mon, Mar 15, 2010 at 12:24 PM, Alf P. Steinbach <alfps at start.no 
> <mailto:alfps at start.no>> wrote:
> 
>     * Sang-Ho Yun:
> 
>         I learned that I can check the existence of a file using
>         os.path.isfile("filename").
> 
>         What if I need to check if there is a file that contains "HV" in the
>         filename?  What should I do?
> 
> 
>     <code>
>        from __future__ import print_function
>        import os
> 
>        for filename in os.listdir( "." ):
>            if "HV" in filename.upper():
>                print( filename )
>     </code>
> 
> 
>     Cheers & hth.,
> 
>     - Alf
> 
>     -- 
>     http://mail.python.org/mailman/listinfo/python-list
> 
> 



From python at mrabarnett.plus.com  Mon Mar 15 11:51:25 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Mon, 15 Mar 2010 15:51:25 +0000
Subject: Large regular expressions
In-Reply-To: <b32951aa1003150521s22d1642cvbb78062f1fe3ed59@mail.gmail.com>
References: <b32951aa1003150521s22d1642cvbb78062f1fe3ed59@mail.gmail.com>
Message-ID: <4B9E577D.8040905@mrabarnett.plus.com>

Nathan Harmston wrote:
> Hi,
> 
> So I m trying to use a very large regular expression, basically I have
> a list of items I want to find in text, its kind of a conjunction of
> two regular expressions and a big list......not pretty. However
> everytime I try to run my code I get this exception:
> 
> OverflowError: regular expression code size limit exceeded
> 
> I understand that there is a Python imposed limit on the size of the
> regular expression. And although its not nice I have a machine with
> 12Gb of RAM just waiting to be used, is there anyway I can alter
> Python to allow big regular expressions?
> 
> Could anyone suggest other methods of these kind of string matching in
> Python? I m trying to see if my swigged alphabet trie is faster than
> whats possible in Python!
> 
There's the regex module at http://pypi.python.org/pypi/regex. It'll
even release the GIL while matching on strings! :-)


From elias.bachaalany at gmail.com  Mon Mar 15 12:39:50 2010
From: elias.bachaalany at gmail.com (lallous)
Date: Mon, 15 Mar 2010 09:39:50 -0700 (PDT)
Subject: to pass self or not to pass self
Message-ID: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>

Hello,

Learning Python from the help file and online resources can leave one
with many gaps. Can someone comment on the following:

# ---------
class X:
    T = 1

    def f1(self, arg):
        print "f1, arg=%d" % arg
    def f2(self, arg):
        print "f2, arg=%d" % arg
    def f3(self, arg):
        print "f3, arg=%d" % arg

    # this:
    F = f2
    # versus this:
    func_tbl = { 1: f1, 2: f2, 3: f3 }

    def test1(self, n, arg):
        # why passing 'self' is needed?
        return self.func_tbl[n](self, arg)

    def test2(self):
        f = self.f1
        f(6)

        f = self.F
        # why passing self is not needed?
        f(87)

# ---------
x = X()

x.test1(1, 5)
print '----------'
x.test2()

Why in test1() when it uses the class variable func_tbl we still need
to pass self, but in test2() we don't ?

What is the difference between the reference in 'F' and 'func_tbl' ?

Thanks,
Elias


From constant.beta at gmail.com  Mon Mar 15 12:56:39 2010
From: constant.beta at gmail.com (Michal Kwiatkowski)
Date: Mon, 15 Mar 2010 09:56:39 -0700 (PDT)
Subject: Arguments and a return value of a C function call when using 
	setprofile
Message-ID: <a10dfeda-9917-4d59-a13a-5bb0b58429da@i25g2000yqm.googlegroups.com>

Hi,

I'm trying to write code that will trace arguments and return values
of all function calls. Using sys.settrace with 'call' and 'return'
events works great for Python functions, but now I want to extend that
to C functions as well. Using sys.setprofile instead in theory gives
me what I need ('c_call' and 'c_return'), but I'm stuck on getting
actual arguments and return values.

A snippet of code is worth a thousand words, so here it is:

import inspect
import sys

def trace(frame, event, arg):
    if event == 'call':
        print "CALL", frame.f_code.co_name, "arguments:",
inspect.getargvalues(frame)
    elif event == 'return':
        print "RETURN", frame.f_code.co_name, "return value:", arg
    elif event == 'c_call':
        print "C_CALL", arg.__name__, "???"
    elif event == 'c_return':
        print "C_RETURN", arg.__name__, "???"

def func(x):
    return x+1

sys.setprofile(trace)
func(1) # Python function
repr(2) # C function
sys.setprofile(None)

For a 'c_call' event the trace function is called *before* the call,
so frame is still in the context of the caller. 'c_return' event is
invoked *after* the function has returned, so I don't get the return
value here either. That's why I can't use inspect.getargvalues in
those cases. Is there any other way I could get arguments and a return
value of a C function call?

Cheers,
mk


From steve at holdenweb.com  Mon Mar 15 13:06:45 2010
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 15 Mar 2010 13:06:45 -0400
Subject: Python for newbies (Pythno users group in Macedonia)
In-Reply-To: <28u177-m9j.ln1@archaeopteryx.softver.org.mk>
References: <hpgq67-gai.ln1@archaeopteryx.softver.org.mk>	<mailman.702.1268486707.23598.python-list@python.org>
	<28u177-m9j.ln1@archaeopteryx.softver.org.mk>
Message-ID: <hnlpgj$5h3$1@dough.gmane.org>

?????? ??????????? wrote:
>> If you are all English-speakers then perhaps you could consider
>> showing a PyCon video - see
>>
>>   http://pycon.blip.tv
> 
> That's certainly something I'm considering for the more advanced users
> 
>> Good luck with the group. I hope to see PyCon Macedonia emerging
>> before too long!
> 
> Thanks :)
> I guess we'd have to wait a decade or so for a PyCon here 
> 
You might be surprised. Python is really taking off right now.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Mon Mar 15 13:09:46 2010
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 15 Mar 2010 13:09:46 -0400
Subject: Fwd: Some PyCon videos won't play
In-Reply-To: <ee9ad2071003142344w7aa3607di24639a5c5b7c4aaf@mail.gmail.com>
References: <SNT106-W28E9678F29E5527CFCBB88B1300@phx.gbl>	<mailman.716.1268506909.23598.python-list@python.org>	<hniugj$b36$1@get-news01.get.basefarm.net>	<hnjakh$mcv$1@dough.gmane.org>
	<hnjjt5$jsk$1@dough.gmane.org>
	<ee9ad2071003142344w7aa3607di24639a5c5b7c4aaf@mail.gmail.com>
Message-ID: <4B9E69DA.7080608@holdenweb.com>

Lan Qing wrote:
> In China these video can not watch at all. I must spent 3 days to
> download it...
> 
That's a great pity. If they would be useful to a large population
perhaps we could consider having copies hosted where they would be
available with higher bandwidth?

Who could we (the Python Software Foundation) discuss such a project with?

regards
 Steve

> On Mon, Mar 15, 2010 at 5:19 AM, Terry Reedy <tjreedy at udel.edu
> <mailto:tjreedy at udel.edu>> wrote:
> 
>     On 3/14/2010 2:41 PM, Terry Reedy wrote:
> 
>         On 3/14/2010 11:14 AM, David Boddie wrote:
> 
> 
>             You should still be able to get at the videos themselves by
>             inspecting
>             the page contents, looking for download links like this one:
> 
>             http://blip.tv/file/get/Pycon-PyCon2010UsingPythonToCreateRoboticSimulationsForPlaneta894.ogv
> 
> 
>             In this case, it's an Ogg Theora video file, so you may want
>             to use
>             a player like VLC to view it:
> 
> 
>         For people using html5 competant browsers, which, I believe,
>         play .ogv
>         'in tha page', blip.tv <http://blip.tv> just needs to update
>         site to make html5 pages an
>         alternative to using the flash player.
> 
> 
>     Actually, for FF3.6, at least, the problem is already solved. I just
>     click on the download button and FF recognizes .ogv as something it
>     can play and it does, replacing the flash player. The FF player
>     lacks a full-screen button, but that is rarely needed for the talks.
> 
>     tjr
> 
> 
> 
> 
>     -- 
>     http://mail.python.org/mailman/listinfo/python-list
> 
> 


-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From martin.schmidt1 at gmail.com  Mon Mar 15 13:16:01 2010
From: martin.schmidt1 at gmail.com (Martin Schmidt)
Date: Mon, 15 Mar 2010 13:16:01 -0400
Subject: extract occurrence of regular expression from elements of XML 
	documents
Message-ID: <5444f9711003151016m39af59efg3ed38d2ac90f93c1@mail.gmail.com>

Hi,

I have just started to use Python a few weeks ago and until last week I had
no knowledge of XML.
Obviously my programming knowledge is pretty basic.
Now I would like to use Python in combination with ca. 2000 XML documents
(about 30 kb each) to search for certain regular expression within specific
elements of these documents.
I would then like to record the number of occurrences of the regular
expression within these elements.
Moreover I would like to count the total number of words contained within
these, and record the attribute of a higher level element that contains
them.
I was trying to figure out the best way how to do this, but got overwhelmed
by the available information (e.g. posts using different approaches based on
dom, sax, xpath, elementtree, expat).
The outcome should be a file that lists the extracted attribute, the number
of occurrences of the regular expression, and the total number of words.
I did not find a post that addresses my problem.
If someone could help me with this I would really appreciate it.

  Martin
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From howe.steven at gmail.com  Mon Mar 15 13:20:10 2010
From: howe.steven at gmail.com (Steven Howe)
Date: Mon, 15 Mar 2010 10:20:10 -0700
Subject: File existence check with partial filename
In-Reply-To: <4B9E55EB.7080802@mrabarnett.plus.com>
References: <C7C2FE43.5AB0%Sang-Ho.Yun@jpl.nasa.gov>	<hnkcqh$avd$1@news.eternal-september.org>	<ee9ad2071003150357y448f2ccej80462f35910d08e2@mail.gmail.com>
	<4B9E55EB.7080802@mrabarnett.plus.com>
Message-ID: <4B9E6C4A.20509@gmail.com>

What wrong with glob?
-----------------------
Help on module glob:

NAME
     glob - Filename globbing utility.

FILE
     /usr/lib64/python2.6/glob.py

FUNCTIONS
     glob(pathname)
         Return a list of paths matching a pathname pattern.

         The pattern may contain simple shell-style wildcards a la fnmatch.

     iglob(pathname)
         Return an iterator which yields the paths matching a pathname 
pattern.

         The pattern may contain simple shell-style wildcards a la fnmatch.

DATA
     __all__ = ['glob', 'iglob']

-------------------
solution:

import glob

for afile in glob.iglob( "/home/buddy/*.HV" ):
     print afile


sph


On 03/15/2010 08:44 AM, MRAB wrote:
> Lan Qing wrote:
>> Or use the regular module:
>>
>> import re
>> import os
>>
>> for filename in os.listdir('.'):
>>     if re.match("*HV*", filename):
>>           # do something with the file
>>
> The regular expression should be ".*HV.*", although:
>
>     re.search("HV", filename)
>
> would be better and:
>
>     "HV" in filename.upper()
>
> would be even better, as Alf posted.
>
>> On Mon, Mar 15, 2010 at 12:24 PM, Alf P. Steinbach <alfps at start.no 
>> <mailto:alfps at start.no>> wrote:
>>
>>     * Sang-Ho Yun:
>>
>>         I learned that I can check the existence of a file using
>>         os.path.isfile("filename").
>>
>>         What if I need to check if there is a file that contains "HV" 
>> in the
>>         filename?  What should I do?
>>
>>
>> <code>
>>        from __future__ import print_function
>>        import os
>>
>>        for filename in os.listdir( "." ):
>>            if "HV" in filename.upper():
>>                print( filename )
>> </code>
>>
>>
>>     Cheers & hth.,
>>
>>     - Alf
>>
>>     --     http://mail.python.org/mailman/listinfo/python-list
>>
>>
>



From steve at holdenweb.com  Mon Mar 15 13:29:51 2010
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 15 Mar 2010 13:29:51 -0400
Subject: extract occurrence of regular expression from elements of XML
	documents
In-Reply-To: <5444f9711003151016m39af59efg3ed38d2ac90f93c1@mail.gmail.com>
References: <5444f9711003151016m39af59efg3ed38d2ac90f93c1@mail.gmail.com>
Message-ID: <hnlqru$9ol$1@dough.gmane.org>

Martin Schmidt wrote:
> Hi,
> 
> I have just started to use Python a few weeks ago and until last week I
> had no knowledge of XML.
> Obviously my programming knowledge is pretty basic.
> Now I would like to use Python in combination with ca. 2000 XML
> documents (about 30 kb each) to search for certain regular expression
> within specific elements of these documents.
> I would then like to record the number of occurrences of the regular
> expression within these elements.
> Moreover I would like to count the total number of words contained
> within these, and record the attribute of a higher level element that
> contains them.
> I was trying to figure out the best way how to do this, but got
> overwhelmed by the available information (e.g. posts using different
> approaches based on dom, sax, xpath, elementtree, expat).
> The outcome should be a file that lists the extracted attribute, the
> number of occurrences of the regular expression, and the total number of
> words.
> I did not find a post that addresses my problem.
> If someone could help me with this I would really appreciate it.
> 
You would get more specific help if you could post an example of the XML
and describe the regex searching you want to do in a little more detail,
I suspect.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From joel.pendery at gmail.com  Mon Mar 15 13:37:34 2010
From: joel.pendery at gmail.com (Joel Pendery)
Date: Mon, 15 Mar 2010 10:37:34 -0700 (PDT)
Subject: subtraction is giving me a syntax error
Message-ID: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>

So I am trying to write a bit of code and a simple numerical
subtraction

y_diff = y_diff-H

is giving me the error

Syntaxerror: Non-ASCII character '\x96' in file on line 70, but no
encoding declared.

Even though I have deleted some lines before it and this line is no
longer line 70, I am still getting the error every time.  I have tried
to change the encoding of the file to utf-8 but to no avail, I still
am having this issue.  Any ideas?

Thanks in advance


From tomf.sessile at gmail.com  Mon Mar 15 13:42:41 2010
From: tomf.sessile at gmail.com (TomF)
Date: Mon, 15 Mar 2010 10:42:41 -0700
Subject: to pass self or not to pass self
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
Message-ID: <2010031510424116807-tomfsessile@gmailcom>

On 2010-03-15 09:39:50 -0700, lallous <elias.bachaalany at gmail.com> said:

> Hello,
> 
> Learning Python from the help file and online resources can leave one
> with many gaps. Can someone comment on the following:
> 
> # ---------
> class X:
>     T = 1
> 
>     def f1(self, arg):
>         print "f1, arg=%d" % arg
>     def f2(self, arg):
>         print "f2, arg=%d" % arg
>     def f3(self, arg):
>         print "f3, arg=%d" % arg
> 
>     # this:
>     F = f2
>     # versus this:
>     func_tbl = { 1: f1, 2: f2, 3: f3 }
> 
>     def test1(self, n, arg):
>         # why passing 'self' is needed?
>         return self.func_tbl[n](self, arg)
> 
>     def test2(self):
>         f = self.f1
>         f(6)
> 
>         f = self.F
>         # why passing self is not needed?
>         f(87)
> 
> # ---------
> x = X()
> 
> x.test1(1, 5)
> print '----------'
> x.test2()
> 
> Why in test1() when it uses the class variable func_tbl we still need
> to pass self, but in test2() we don't ?
> 
> What is the difference between the reference in 'F' and 'func_tbl' ?

I recommend putting print statements into your code like this:

    def test1(self, n, arg):
        print "In test1, I'm calling a %s" % self.func_tbl[n]
        return self.func_tbl[n](self, arg)

    def test2(self):
        f = self.f1
        print "Now in test2, I'm calling a %s" % f
        f(6)


Bottom line: You're calling different things.  Your func_tbl is a dict 
of functions, not methods.

-Tom



From R.Brodie at rl.ac.uk  Mon Mar 15 13:42:50 2010
From: R.Brodie at rl.ac.uk (Richard Brodie)
Date: Mon, 15 Mar 2010 17:42:50 -0000
Subject: subtraction is giving me a syntax error
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
Message-ID: <hnlriq$7or$1@south.jnrs.ja.net>


"Joel Pendery" <joel.pendery at gmail.com> wrote in message 
news:56597268-3472-4fd9-a829-6d9cf51cf093 at e7g2000yqf.googlegroups.com...

>> y_diff = y_diff-H
>
> Syntaxerror: Non-ASCII character '\x96' in file on line 70, but no
> encoding declared.

That's likely an en-dash, not a minus sign. 




From benjamin.kaplan at case.edu  Mon Mar 15 13:48:08 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Mon, 15 Mar 2010 13:48:08 -0400
Subject: subtraction is giving me a syntax error
In-Reply-To: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
Message-ID: <ec96e1391003151048m17ee8845qf350b7d309f4a80e@mail.gmail.com>

On Mon, Mar 15, 2010 at 1:37 PM, Joel Pendery <joel.pendery at gmail.com>wrote:

> So I am trying to write a bit of code and a simple numerical
> subtraction
>
> y_diff = y_diff-H
>
> is giving me the error
>
> Syntaxerror: Non-ASCII character '\x96' in file on line 70, but no
> encoding declared.
>
> Even though I have deleted some lines before it and this line is no
> longer line 70, I am still getting the error every time.  I have tried
> to change the encoding of the file to utf-8 but to no avail, I still
> am having this issue.  Any ideas?
>
> Thanks in advance
>

It's not UTF-8. My guess would be that you're on Windows and it's a dash
character in cp1252. The actual minus sign is 0x2D. Your editor must be
putting in the wrong character.
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From philip at semanchuk.com  Mon Mar 15 13:48:54 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Mon, 15 Mar 2010 13:48:54 -0400
Subject: subtraction is giving me a syntax error
In-Reply-To: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
Message-ID: <3620300A-6BDB-40DA-98D0-9FB1D4E4B071@semanchuk.com>


On Mar 15, 2010, at 1:37 PM, Joel Pendery wrote:

> So I am trying to write a bit of code and a simple numerical
> subtraction
>
> y_diff = y_diff-H
>
> is giving me the error
>
> Syntaxerror: Non-ASCII character '\x96' in file on line 70, but no
> encoding declared.
>
> Even though I have deleted some lines before it and this line is no
> longer line 70, I am still getting the error every time.  I have tried
> to change the encoding of the file to utf-8 but to no avail, I still
> am having this issue.  Any ideas?


0x96 is the Win1252 minus sign character. Did you copy & paste this  
code from a Web browser or a word processor?

Delete the character between "y_diff" and "H" and replace it with a  
plain ASCII subtraction sign.







From python at mrabarnett.plus.com  Mon Mar 15 14:00:42 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Mon, 15 Mar 2010 18:00:42 +0000
Subject: subtraction is giving me a syntax error
In-Reply-To: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
Message-ID: <4B9E75CA.4010203@mrabarnett.plus.com>

Joel Pendery wrote:
> So I am trying to write a bit of code and a simple numerical
> subtraction
> 
> y_diff = y_diff-H
> 
> is giving me the error
> 
> Syntaxerror: Non-ASCII character '\x96' in file on line 70, but no
> encoding declared.
> 
> Even though I have deleted some lines before it and this line is no
> longer line 70, I am still getting the error every time.  I have tried
> to change the encoding of the file to utf-8 but to no avail, I still
> am having this issue.  Any ideas?
> 
> Thanks in advance

Character '\x96' is an en-dash, which looks like a hyphen/minus sign
'-', but isn't.


From rami.chowdhury at gmail.com  Mon Mar 15 14:01:00 2010
From: rami.chowdhury at gmail.com (Rami Chowdhury)
Date: Mon, 15 Mar 2010 11:01:00 -0700
Subject: to pass self or not to pass self
In-Reply-To: <2010031510424116807-tomfsessile@gmailcom>
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<2010031510424116807-tomfsessile@gmailcom>
Message-ID: <201003151101.01118.rami.chowdhury@gmail.com>

On Monday 15 March 2010 10:42:41 TomF wrote:
> On 2010-03-15 09:39:50 -0700, lallous <elias.bachaalany at gmail.com> said:
> >     
> > Why in test1() when it uses the class variable func_tbl we still need
> > to pass self, but in test2() we don't ?
> > 
> > What is the difference between the reference in 'F' and 'func_tbl' ?
> 
> I recommend putting print statements into your code like this:
> 
>     def test1(self, n, arg):
>         print "In test1, I'm calling a %s" % self.func_tbl[n]
>         return self.func_tbl[n](self, arg)
> 
>     def test2(self):
>         f = self.f1
>         print "Now in test2, I'm calling a %s" % f
>         f(6)
> 
> 
> Bottom line: You're calling different things.  Your func_tbl is a dict
> of functions, not methods.
> 
> -Tom

To build on that a bit, note that in test2() you are doing:
> >         f = self.f1
> >         f(6)
> >         
> >         f = self.F
> >         # why passing self is not needed?
> >         f(87)

As I understand it, since you obtained the reference to 'f1' from 'self', you 
got it as a bound rather than an unbound method. So 'self' is automatically 
passed in as the first argument. 

----
Rami Chowdhury
"Given enough eyeballs, all bugs are shallow." -- Linus' Law
408-597-7068 (US) / 07875-841-046 (UK) / 01819-245544 (BD)


From invalid at invalid.invalid  Mon Mar 15 14:09:29 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Mon, 15 Mar 2010 18:09:29 +0000 (UTC)
Subject: subtraction is giving me a syntax error
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
	<mailman.800.1268675343.23598.python-list@python.org>
Message-ID: <hnlt4p$4j1$1@reader1.panix.com>

On 2010-03-15, Philip Semanchuk <philip at semanchuk.com> wrote:
> On Mar 15, 2010, at 1:37 PM, Joel Pendery wrote:
>
>> So I am trying to write a bit of code and a simple numerical
>> subtraction
>>
>> y_diff = y_diff-H
>>
>> is giving me the error
>>
>> Syntaxerror: Non-ASCII character '\x96' in file on line 70, but no
>> encoding declared.
[...]
>
> 0x96 is the Win1252 minus sign character. Did you copy & paste this 
> code from a Web browser or a word processor?
>
> Delete the character between "y_diff" and "H" and replace it with a 
> plain ASCII subtraction sign.

I think somebody needs to stop editing his code with MS Word and start
using a programming editor. ;)

-- 
Grant Edwards               grant.b.edwards        Yow! Make me look like
                                  at               LINDA RONSTADT again!!
                              gmail.com            


From jeanmichel at sequans.com  Mon Mar 15 14:24:38 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 15 Mar 2010 19:24:38 +0100
Subject: class inheritance
In-Reply-To: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
Message-ID: <4B9E7B66.10702@sequans.com>

JLundell wrote:
> I've got a subclass of fractions.Fraction called Value; it's a mostly
> trivial class, except that it overrides __eq__ to mean 'nearly equal'.
> However, since Fraction's operations result in a Fraction, not a
> Value, I end up with stuff like this:
>
> x = Value(1) + Value(2)
>
> where x is now a Fraction, not a Value, and x == y uses
> Fraction.__eq__ rather than Value.__eq__.
>
> This appears to be standard Python behavior (int does the same thing).
> I've worked around it by overriding __add__, etc, with functions that
> invoke Fraction but coerce the result. But that's tedious; there are a
> lot of methods to override.
>
> So I'm wondering: is there a more efficient way to accomplish what I'm
> after?
>   
I would change the approach.
To the question, "*is* a Value a Fraction", some may tempted to answer 
"No" (for instance, a fraction has a denominator, a value has not).
However "Does a Fraction *have* a Value", you could possibly say "Yes".

The value may be then an attribute of the class Fraction, not a subclass.
To test fraction equality, use F1 == F2. In order to test 'nearly 
equality', use F1.val() == F2.val().

JM






From jeanmichel at sequans.com  Mon Mar 15 14:25:00 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 15 Mar 2010 19:25:00 +0100
Subject: staticmethod and setattr
In-Reply-To: <1268663020.10067.35.camel@laptop>
References: <1268663020.10067.35.camel@laptop>
Message-ID: <4B9E7B7C.8050701@sequans.com>

Am Montag, den 15.03.2010, 05:42 -0700 schrieb Michael.Lausch:
>> On Mar 15, 11:40 am, Steven D'Aprano <st... at REMOVE-THIS-
>> cybersource.com.au> wrote:
>>     
>>> On Mon, 15 Mar 2010 01:43:02 -0700, Michael.Lausch wrote:
>>>       
>>>> Hi,
>>>>         
>>>> I managed to get confused by Python, which is not such an easy task.
>>>>         
>>>> The problem i have is rooted in marshalling, JSON and Dojo. I need some
>>>> static class in function with the name "$ref" i tried:
>>>> class Foo(object):
>>>>     @staticmethod
>>>>     def _ref(o):
>>>>          pass
>>>>         
>>>> setattr(Foo, "$ref", Foo._ref)
>>>>         
>>> That doesn't work as expected:
>>>
>>>       
>>>>>> Foo.__dict__['_ref'] is Foo.__dict__['$ref']
>>>>>>             
>>> False
>>>
>>> Try this instead:
>>>
>>>       
>>>>>> setattr(Foo, "$ref", Foo.__dict__['_ref'])
>>>>>> Foo.__dict__['_ref'] is Foo.__dict__['$ref']
>>>>>>             
>>> True
>>>       
>> Now I'm trying to understand why this is the case.
>> How is Foo.__dict__['_ref']  different from Foo._ref?
>> Shouldn't it return the same attribute?
>>
>> And after further experiments i found out that a making
>> Foo._ref a classmethod does work with my first approach.
>>
>>     

When you declared _ref as static, a static object has been stored in Foo.
Using Foo.__dict__ you can access this static object, which is *not* the 
_ref function
Using Foo._ref, you trigger the lookup mechanism which do much more than 
accessing the dict. Especially, if it finds a __get__ method in the 
object, it will return the __get__ result instead of the object itself.

Foo._ref is equivalent in your case to 
Foo.__dict__['_ref'].__get__(None, Foo)


JM




From jeanmichel at sequans.com  Mon Mar 15 14:39:31 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 15 Mar 2010 19:39:31 +0100
Subject: "Breaking" the __main__ script
In-Reply-To: <hnjihi$eur$1@dough.gmane.org>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com><mailman.726.1268567615.23598.python-list@python.org>	<hnik9k$ju1$1@news.urz.uni-heidelberg.de><mailman.733.1268579034.23598.python-list@python.org>	<hnjdpj$nk8$1@news.urz.uni-heidelberg.de>	<1268597301.21932.1364768439@webmail.messagingengine.com>
	<hnjihi$eur$1@dough.gmane.org>
Message-ID: <4B9E7EE3.6000807@sequans.com>

Steve Holden wrote:
> python at bdurham.com wrote:
>   
>>>> Any reason you prefer PDB over WinPDB?
>>>> http://winpdb.org/
>>>>         
>>> Yes. I don't have Windows except one one PC :P
>>>       
>> WinPDB runs on non-Windows platforms :)
>>
>>     
> One might reasonably argue that it has a pretty couter-intuitive name, then.
>
> regards
>  Steve
>   
'Win' may stand for Winner, not Windows :D

JM


From jeanmichel at sequans.com  Mon Mar 15 14:41:18 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 15 Mar 2010 19:41:18 +0100
Subject: "Breaking" the __main__ script
In-Reply-To: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com>
Message-ID: <4B9E7F4E.4040900@sequans.com>

vsoler wrote:
> Hello,
>
> I am still learning python, thus developnig small scripts.
>
> Some of them consist only of the main module. While testing them
> (debugging) I sometimes want to stop the script at a certain point,
> with something like    stop, break, end   or something similar.
>
> What statement can I use?
>
> Vicente Soler
>   
import bdb

pdb.set_trace() # put this line anywhere you want a breakpoint in your code.

type n for next, c for continue, s for step into and google for 'python 
pdb' for the details.

JM


From baptiste13z at free.fr  Mon Mar 15 14:43:53 2010
From: baptiste13z at free.fr (Baptiste Carvello)
Date: Mon, 15 Mar 2010 19:43:53 +0100
Subject: subtraction is giving me a syntax error
In-Reply-To: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
Message-ID: <hnlv60$t71$1@dough.gmane.org>

Joel Pendery a ?crit :
> So I am trying to write a bit of code and a simple numerical
> subtraction
> 
> y_diff = y_diff-H
> 
> is giving me the error
> 
> Syntaxerror: Non-ASCII character '\x96' in file on line 70, but no
> encoding declared.
> 
> Even though I have deleted some lines before it and this line is no
> longer line 70, I am still getting the error every time.  I have tried
> to change the encoding of the file to utf-8 but to no avail, I still
> am having this issue.  Any ideas?
> 
> Thanks in advance

Hello,

I would say that when you press the minus key, your operating system doesn't 
encode the standard (ASCII) minus character, but some fancy character, which 
Python cannot interpret.

More precisely, I suspect you are unsing Windows with codepage 1252 (latin 1). 
With this encoding, you have 2 kinds of minus signs: the standard (45th 
character, in hex '\x2d') and the non-standard (150th character, in hex '\x96').

cf:
http://msdn.microsoft.com/en-us/library/cc195054.aspx

Cheers,
Baptiste



From jeanmichel at sequans.com  Mon Mar 15 14:50:18 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 15 Mar 2010 19:50:18 +0100
Subject: "Breaking" the __main__ script
In-Reply-To: <4B9E7F4E.4040900@sequans.com>
References: <31fd39a9-fbc6-4d9c-8da3-0939eedaf848@f8g2000yqn.googlegroups.com>
	<4B9E7F4E.4040900@sequans.com>
Message-ID: <4B9E816A.7090608@sequans.com>

Jean-Michel Pichavant wrote:
> vsoler wrote:
>> Hello,
>>
>> I am still learning python, thus developnig small scripts.
>>
>> Some of them consist only of the main module. While testing them
>> (debugging) I sometimes want to stop the script at a certain point,
>> with something like    stop, break, end   or something similar.
>>
>> What statement can I use?
>>
>> Vicente Soler
>>   
> import bdb
>
> pdb.set_trace() # put this line anywhere you want a breakpoint in your 
> code.
>
> type n for next, c for continue, s for step into and google for 
> 'python pdb' for the details.
>
> JM
erratum

import pdb


From astley.lejasper at gmail.com  Mon Mar 15 15:10:21 2010
From: astley.lejasper at gmail.com (Astley Le Jasper)
Date: Mon, 15 Mar 2010 12:10:21 -0700 (PDT)
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>
	<mailman.619.1268324988.23598.python-list@python.org>
	<4B992FB5.8090207@v.loewis.de> 
	<4B9A2810.9030602@chamonix.reportlab.co.uk>
	<4B9A614C.1080105@chamonix.reportlab.co.uk> 
	<4B9A9624.7040200@v.loewis.de>
	<mailman.783.1268647151.23598.python-list@python.org>
Message-ID: <8aa22e57-f152-4dc7-88da-cf6879de41f7@q16g2000yqq.googlegroups.com>

Hi Robin,

It looks like you've been busy. I'm sorry but you are well over my
head at the moment!

:-)

If you need me to test an install then I'd be happy to help. However,
I just received an email from Christoph Gohlke saying:

" ... There are 64 bit versions of Reportlab and PIL for Python 2.6
for Windows available at http://www.lfd.uci.edu/~gohlke/pythonlibs/
..."

Regards

Neil




From dmitrey.kroshko at scipy.org  Mon Mar 15 15:13:29 2010
From: dmitrey.kroshko at scipy.org (dmitrey)
Date: Mon, 15 Mar 2010 12:13:29 -0700 (PDT)
Subject: [ANN] OpenOpt 0.28, FuncDesigner 0.18, DerApproximator 0.18
Message-ID: <4e6fa172-6edb-4c1a-bc9d-8ba334008101@d27g2000yqf.googlegroups.com>

Hi all,
I'm glad to inform you about new release of our free (BSD-licensed)
soft OpenOpt 0.28 (numerical optimization), FuncDesigner 0.18 (CAS
with automatic differentiation), DerApproximator 0.18 (finite-
differeces derivatives approximation).

More details here:
http://forum.openopt.org/viewtopic.php?id=222

Regards, D.


From philip at semanchuk.com  Mon Mar 15 15:38:54 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Mon, 15 Mar 2010 15:38:54 -0400
Subject: Clustering and automated configuration & deployment toolkit with
	Python
In-Reply-To: <003064f8-e559-41e9-8110-11fad8373d09@y17g2000yqd.googlegroups.com>
References: <003064f8-e559-41e9-8110-11fad8373d09@y17g2000yqd.googlegroups.com>
Message-ID: <577D1DA0-EAB5-4AC0-8C65-5E22CD56475C@semanchuk.com>


On Mar 13, 2010, at 6:21 PM, np map wrote:

> I'd like to write an open source clustering (for computation and
> general use) and automation of configuration/deployment in Python.
> It's main purpose is to be used in academic environments.
> It would be something like running numpy/simpy code (and other custom
> python code) on a set of machines in a distributed fashion (e.g.
> splitting tasks, doing certain bits on some machines, other sub-tasks
> on other machines, etc).

Hi np map,
Are you aware of ipython? My colleagues tell me that it contains some  
code for executing processes on remote machines. It sounds like code  
which you could build on or borrow from.

HTH
Philip



>
> The cluster could be used in at least two ways:
> - submit code/files via a web interface, monitor the task via the web
> interface and download the results from the master node  (user<>web
> interface<>master)
> - run code directly from another machine on the cluster (as if it were
> a subprocess or something like this)
>
>
> Requirements (so far):
> - support the Ubuntu Linux distribution in the initial iteration
> - be easy to extend to other OS-es and package managers
> - try to be 3.x compatible where dual compatibility is possible (2.x
> and 3.x)
> - it will support Python 2.5-2.6
> - document required changes to the 2.x only code to make it work on
> 3.x
> - make it easy to submit code directly from python scripts to the
> cluster (with the right credentials)
> - support key based authentication for job submission
> - should talk to at least one type of RDBMS to store various types of
> data
> - the cluster should be able to kill a task on nodes automatically if
> it executes for too long or requires too much memory (configurable)
> - should be modular (use automation & configuration or just
> clustering)
>
>
> Therefore, I'd like to know a few things:
>
> Is there a clustering toolkit already available for python?
>
> What would the recommended architecture be ?
>
> How should the "user" code interface with the clustering system's
> code?
>
> How should the results be stored (at the node and master level)?
>
> Should threading be supported in the tasks?
>
> How should they be returned to the Master node(s)? (polling, submitted
> by the nodes, etc)
>
> What libraries should be used for this? (e.g. fabric as a library,
> pyro, etc)
>
> Any other suggestions and pieces of advice?
>
> Should Fabric be used in this clustering system for automation? If
> not, what else? Would simply using a wrapper written in python for the
> 'ssh' app be ok?
>
> Would the following architecture be ok?
> Master: splits tasks into sub-tasks, sends them to nodes - provided
> the node's load isn't greater than a certain percentage, gets results,
> stores and provides configuration to nodes, stores results, etc
> Node: runs code, applies configuration, submits the results to the
> master, etc
>
> If this system actually gets python-level code submission inside, how
> should it work?
>
> The reason I posted this set of questions and ideas is that I'd like
> this to be as flexible and usable as possible.



From aahz at pythoncraft.com  Mon Mar 15 15:57:23 2010
From: aahz at pythoncraft.com (Aahz)
Date: 15 Mar 2010 12:57:23 -0700
Subject: When to lock data items returned by multiprocessing.Manager?
References: <4428d674-7fa7-4095-a93d-75ea31a81d9a@15g2000yqi.googlegroups.com>
Message-ID: <hnm3f3$6r3$1@panix5.panix.com>

In article <4428d674-7fa7-4095-a93d-75ea31a81d9a at 15g2000yqi.googlegroups.com>,
Veloz  <michaelveloz at gmail.com> wrote:
>
>So I'm using a multiprocessing.Manager instance in my main app and
>asking it to create a dictionary, which I am providing to instances of
>the application that I'm forking off with Process.
>
>The Processes and main app will be reading/writing to the dictionary.
>
>It's not clear to me what I have to "lock" and what I don't have to
>lock. Any ideas?

The way I deal with it is by making sure each key is only updated by a
single process.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From jkn_gg at nicorp.f9.co.uk  Mon Mar 15 16:52:16 2010
From: jkn_gg at nicorp.f9.co.uk (jkn)
Date: Mon, 15 Mar 2010 13:52:16 -0700 (PDT)
Subject: Reverse engineering CRC?
References: <7vj7fdFnnjU1@mid.individual.net> <kz88du.hk0@spenarnc.xs4all.nl> 
	<4B9E0C1F.9020003@canterbury.ac.nz>
Message-ID: <d5620f1a-b9f5-425b-b30e-b5a33712a760@t23g2000yqt.googlegroups.com>

Hi Greg
    Just to say thanks for taking the time to write up your work on
this interesting topic.

    Cheers
    J^n



From debatem1 at gmail.com  Mon Mar 15 16:57:23 2010
From: debatem1 at gmail.com (geremy condra)
Date: Mon, 15 Mar 2010 16:57:23 -0400
Subject: Reverse engineering CRC?
In-Reply-To: <4B9E0C1F.9020003@canterbury.ac.nz>
References: <7vj7fdFnnjU1@mid.individual.net> <kz88du.hk0@spenarnc.xs4all.nl>
	<4B9E0C1F.9020003@canterbury.ac.nz>
Message-ID: <f3cc57c61003151357q7d1c8bf4laff5b49f972d4ab3@mail.gmail.com>

On Mon, Mar 15, 2010 at 6:29 AM, Gregory Ewing
<greg.ewing at canterbury.ac.nz> wrote:
> I've solved the problem now.
>
> It turned out to be a very standard CRC algorithm, complicated
> by the presence of a few extra bytes of data being checked that
> didn't appear explicitly in the file anywhere.
>
> In the process I developed some very general techniques for
> solving this kind of problem, which I've written about here
> if anyone's interested:
>
> http://www.cosc.canterbury.ac.nz/greg.ewing/essays/CRC-Reverse-Engineering.html
>
> Thanks for everyone's help,
> Greg

Nice writeup, thanks.

Geremy Condra


From steve at REMOVE-THIS-cybersource.com.au  Mon Mar 15 18:33:33 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 15 Mar 2010 22:33:33 GMT
Subject: subtraction is giving me a syntax error
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
	<mailman.800.1268675343.23598.python-list@python.org>
	<hnlt4p$4j1$1@reader1.panix.com>
Message-ID: <4b9eb5bd$0$27822$c3e8da3@news.astraweb.com>

On Mon, 15 Mar 2010 18:09:29 +0000, Grant Edwards wrote:

>> Delete the character between "y_diff" and "H" and replace it with a
>> plain ASCII subtraction sign.
> 
> I think somebody needs to stop editing his code with MS Word and start
> using a programming editor. ;)


I've had this error myself, and I've never used Word to edit code. It can 
happen if you copy code from a website that "helpfully" converts hyphens 
to en-dashes, spaces to non-breaking spaces, or inserts ctrl-Z characters 
into strings, etc. They're a devil to debug.


-- 
Steven


From sjmachin at lexicon.net  Mon Mar 15 18:48:45 2010
From: sjmachin at lexicon.net (John Machin)
Date: Mon, 15 Mar 2010 15:48:45 -0700 (PDT)
Subject: subtraction is giving me a syntax error
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
	<mailman.807.1268678671.23598.python-list@python.org>
Message-ID: <6e982a4f-ebef-4b91-957d-7b50895c7f5d@k18g2000prf.googlegroups.com>

On Mar 16, 5:43?am, Baptiste Carvello <baptiste... at free.fr> wrote:
> Joel Pendery a ?crit :

> > So I am trying to write a bit of code and a simple numerical
> > subtraction
>
> > y_diff = y_diff-H
>
> > is giving me the error
>
> > Syntaxerror: Non-ASCII character '\x96' in file on line 70, but no
> > encoding declared.
>
>
> I would say that when you press the minus key, your operating system doesn't
> encode the standard (ASCII) minus character, but some fancy character, which
> Python cannot interpret.

The likelihood that any operating system however brain-damaged and in
whatever locale would provide by default a "keyboard" or "input
method" that generated EN DASH when the '-' key is struck is somewhere
between zero and epsilon.

Already advanced theories like "used a word processor instead of a
programmer's editor" and "scraped it off the web" are much more
plausible.

> More precisely, I suspect you are unsing Windows with codepage 1252 (latin 1).

Codepage 1252 is not "latin1" in the generally accepted meaning of
"latin1" i.e. ISO-8859-1. It is a superset. MS in their wisdom or
otherwise chose to use most of the otherwise absolutely wasted slots
assigned to "C1 control characters" in latin1.

> With this encoding, you have 2 kinds of minus signs: the standard (45th
> character, in hex '\x2d') and the non-standard (150th character, in hex '\x96').
>
> cf:http://msdn.microsoft.com/en-us/library/cc195054.aspx

The above link quite correctly says that '\x96` maps to U+2013 EN
DASH. EN DASH is not any kind of minus sign.

Aside: the syndrome causing the problem is apparent with cp125x for x
in range(9)





From invalid at invalid.invalid  Mon Mar 15 18:56:19 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Mon, 15 Mar 2010 22:56:19 +0000 (UTC)
Subject: subtraction is giving me a syntax error
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
	<mailman.800.1268675343.23598.python-list@python.org>
	<hnlt4p$4j1$1@reader1.panix.com>
	<4b9eb5bd$0$27822$c3e8da3@news.astraweb.com>
Message-ID: <hnmduj$gnp$1@reader1.panix.com>

On 2010-03-15, Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> wrote:
> On Mon, 15 Mar 2010 18:09:29 +0000, Grant Edwards wrote:
>
>>> Delete the character between "y_diff" and "H" and replace it with a
>>> plain ASCII subtraction sign.
>> 
>> I think somebody needs to stop editing his code with MS Word and start
>> using a programming editor. ;)
>
> I've had this error myself, and I've never used Word to edit code. It can 
> happen if you copy code from a website that "helpfully" converts hyphens 
> to en-dashes, spaces to non-breaking spaces, or inserts ctrl-Z characters 
> into strings, etc. They're a devil to debug.

Though it may not be Microsoft Word, I think I'd still maintain that
an editor where you can't see a ctrl-Z or tell the difference between
an ASCII minus and a windows-codepage-whatever isn't a very good
programmer's editor.

-- 
Grant Edwards               grant.b.edwards        Yow! HUMAN REPLICAS are
                                  at               inserted into VATS of
                              gmail.com            NUTRITIONAL YEAST ...


From jlundell at pobox.com  Mon Mar 15 19:34:35 2010
From: jlundell at pobox.com (JLundell)
Date: Mon, 15 Mar 2010 16:34:35 -0700 (PDT)
Subject: class inheritance
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
	<9bb4c1e7-858e-4ee6-870b-5a6549b6c496@b36g2000pri.googlegroups.com>
Message-ID: <05d0d40f-3fa0-4095-875d-777b49122d12@l12g2000prg.googlegroups.com>

On Mar 13, 1:26?pm, Carl Banks <pavlovevide... at gmail.com> wrote:
> It's a tad unfortunately Python doesn't make this easier. ?If I had to
> do it more than once I'd probably write a mixin to do it:
>
> class ArithmeticSelfCastMixin(object):
> ? ? def __add__(self,other):
> ? ? ? ? return
> self.__class__(super(ArithmeticSelfCastMixin,self).__add__(other)
> ? ? # etc.
>
> class Value(ArithmeticSelfCastMixin,fraction.Fraction):
> ? ? pass
>
> However, I want to warn you about overriding __eq__ to mean "almost
> equal": it can have unexpected results so I don't recommend it. ?Two
> of the main issues with it are:
>
> 1. It violates the transitive property ("If A == B and B == C, then A
> == C") which most programmers expect to be true.
>
> 2. It will give unpredictable results when the objects are used in
> sets or as dictionary keys. ?Those thow types expect the transitive
> property to be true. ?If you are going to redefine __eq__ to mean
> "almost equal", then at least define __hash__ to raise
> NotImplementedError so that Python will refuse to use them in sets or
> as dictionary keys:
>
> ? ? def __hash__(self): raise NotImplementedError
>
> Carl Banks

It's also unfortunate that Python doesn't have an approximately-equal
operator; it'd come in handy for floating-point applications while
preserving hash. If only there were a ~= or ? operator I could
overload. And ~ is unary, so no joy.

My application is in that sense a little like a floating-point app, in
that it needs approximately-equal. And it doesn't need Value to be
hashable; thanks for the NotImplementedError suggestion; I've done
that as a safeguard.



From mail at hellmutweber.de  Mon Mar 15 19:36:01 2010
From: mail at hellmutweber.de (Hellmut Weber)
Date: Tue, 16 Mar 2010 00:36:01 +0100
Subject: logging: local functions ==> loss of lineno
In-Reply-To: <hnaj9c$i0u$02$1@news.t-online.com>
References: <mailman.576.1268256192.23598.python-list@python.org>
	<hnaj9c$i0u$02$1@news.t-online.com>
Message-ID: <4B9EC461.9090009@hellmutweber.de>

Am 11.03.2010 12:14, schrieb Peter Otten:
> Hellmut Weber wrote:
>
>> Logging works very well giving the filename and line number of the point
>> where it is called. As long as I use the loggers directly.
>> BUT when I have to wrap the logger call in some other function, I always
>> get file name and line number of the call of the logger inside the
>> wrapping function.
>>
>> Is there a possibility to get this information in this situation too?
>
> The official way is probably to write a custom Logger class that overrides
> the findCaller() method.
>
> Below is a hack that monkey-patches the logging._srcfile attribute to ignore
> user-specified modules in the call stack:
>
> $ cat wrapper.py
> import logging
> import os
> import sys
>
> logger = logging.getLogger()
>
> class SrcFile(object):
>      def __init__(self, exclude_files):
>          self.files = set(exclude_files)
>      def __eq__(self, other):
>          return other in self.files
>
> def fixname(filename):
>      if filename.lower().endswith((".pyc", ".pyo")):
>          filename = filename[:-4] + ".py"
>      return os.path.normcase(filename)
>
> if "--monkey" in sys.argv:
>      print "patching"
>      logging._srcfile = SrcFile([logging._srcfile, fixname(__file__)])
>
> def warn(*args, **kw):
>      logger.warn(*args, **kw)
>
> $ cat main.py
> import logging
> logging.basicConfig(format="%(filename)s<%(lineno)s>: %(message)s")
> import wrapper
> wrapper.warn("foo")
> wrapper.warn("bar")
> wrapper.warn("baz")
>
> $ python main.py
> wrapper.py<23>: foo
> wrapper.py<23>: bar
> wrapper.py<23>: baz
>
> $ python main.py --monkey
> patching
> main.py<4>: foo
> main.py<5>: bar
> main.py<6>: baz
>
> $ python -V
> Python 2.6.4
>
> Peter

Hi Peter,
thanks for your help ;-)

I've been offline for a few days so I found your message only today.
I'll try your proposal tomorrow.

Thanks again

Hellmut

-- 
Dr. Hellmut Weber         mail at hellmutweber.de
Degenfeldstra?e 2         tel   +49-89-3081172
D-80803 M?nchen-Schwabing mobil +49-172-8450321
please: No DOCs, no PPTs. why: tinyurl.com/cbgq



From pavlovevidence at gmail.com  Mon Mar 15 21:03:15 2010
From: pavlovevidence at gmail.com (Carl Banks)
Date: Mon, 15 Mar 2010 18:03:15 -0700 (PDT)
Subject: class inheritance
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
	<9bb4c1e7-858e-4ee6-870b-5a6549b6c496@b36g2000pri.googlegroups.com> 
	<05d0d40f-3fa0-4095-875d-777b49122d12@l12g2000prg.googlegroups.com>
Message-ID: <7088c1e1-9a1f-42d8-aac2-5ba19806165a@o30g2000yqb.googlegroups.com>

On Mar 15, 4:34?pm, JLundell <jlund... at pobox.com> wrote:
> It's also unfortunate that Python doesn't have an approximately-equal
> operator; it'd come in handy for floating-point applications while
> preserving hash. If only there were a ~= or ? operator I could
> overload. And ~ is unary, so no joy.

One problem with it is that there's no way to make it universal;
different appiplications have different ideas of close.  Conceivably
it could be usefully defined for a user type though..

Bacause of this problem almost no languages have an almost equal
operator.  I'm curious what languages do, of if there are any with a
trinary operator that also takes a threshold.

Carl Banks


From twistedphrame at gmail.com  Mon Mar 15 22:07:00 2010
From: twistedphrame at gmail.com (Jordan Apgar)
Date: Mon, 15 Mar 2010 19:07:00 -0700 (PDT)
Subject: Binary data transfer issue
Message-ID: <40c9fafc-a172-4c9c-ba21-35ac8a4029aa@z35g2000yqd.googlegroups.com>

Hi all,

I'm trying to transfer a binary file over xmlrpclib.   My test file is
a .jpeg file.  I can transfer all the data over but when I go to open
the .jpeg I get "Error interpreting JPEG image file (Invalid JPEG file
structure: SOS before SOF)"

here's the code:

===========Various Shared Functions========
#EncodeAES takes a Cipher c and encrypts a String s
EncodeAES = lambda c, s: base64.b64encode(c.encrypt(pad(s)))

#DecodeAES takes a Cipher C and decrypts the cyphertext e
    #then removes the padding from the decrypted string
DecodeAES = lambda c, e:
c.decrypt(base64.b64decode(e)).rstrip(PADDING)


CIPHER = AES.new("KEY")


# method to change strings back into tuples
def stringToTuple(string):
    if string[0] + string[-1] == "()":
        items = string[1:-1]
        items = items.split(',')
        return items
    else:
        raise ValueError("Badly formatted string (missing brackets).")

======client=================
 def Download(self, FileName, Data_Size=1024):
        ErrorCount = 0
        Pkt_Num = -1
        OldPkt_Num = Pkt_Num
        localFile = open("files/"+FileName, "wb")
        print
        print "Requesting First Packet"
        packet = self.client.download(EncodeAES(CIPHER, str(Pkt_Num)))
        if packet[0] == "False":
            print packet[1]
            return False
        packet = stringToTuple(DecodeAES(CIPHER, packet))
        if int(packet[0]) == -3:
            print "Received Error Packet"
        else:
            print "Received Packet: ", int(packet[0])

        print "packet[1], ", packet[2:-1]

        Pkt_Num = int(packet[0])

        while Pkt_Num >= 0 and ErrorCount <= 10:
            if (OldPkt_Num +1) == Pkt_Num:
                OldPkt_Num = OldPkt_Num +1
                localFile.write(binascii.
                                a2b_base64(packet[1][2:-1]))
#<<<<!!!!!<<< writing to the file on the client
                ErrorCount == 0
            else:
                ErrorCount = ErrorCount +1
                Pkt_Num = OldPkt_Num

            print "Requesting Packet: ", Pkt_Num +1
            packet = self.client.download(EncodeAES(CIPHER,
str(Pkt_Num)))
            packet = stringToTuple(DecodeAES(CIPHER, packet))
            Pkt_Num = int(packet[0])
            if int(packet[0]) == -3:
                print "Received Error Packet"
            elif int(packet[0]) == -2:
                print "Received EOF"
            else:
                print "Received Packet: ", int(packet[0])

        localFile.close()

        if Pkt_Num == -2:
            print packet[1][2:-1]
            return True
        elif Pkt_Num == -3:
            os.remove("files/"+FileName)
            print packet[1][2:-1]
            return False
        else:
            os.remove("files/"+FileName)
            print "Unexpected Packet: File Transfer Stopped"
            return False


==========Server Method=============
    def download(self, Pkt_Num):

        Old_Pkt_Num = self.PKT
        DataRate = self.DATA
        Pkt_Num = int(DecodeAES(CIPHER,Pkt_Num))
        if Pkt_Num == -1 and Old_Pkt_Num == -1:
            Pkt_Num = 0
            try:
                f = open("files/"+self.usr_dict[client][FILENAME],
"rb")
            except IOError:
                return EncodeAES(CIPHER,
                                 str((-3, "File Could Not be
opened")))
             data = binascii.b2a_base64(f.read((Pkt_Num+1 *
DataRate)))     #<<<<<<!!!!!!!<<<<<<<< reading from file
            f.close()
            self.usr_dict[client][PKT] = Pkt_Num
            return EncodeAES(CIPHER,
                             str((Pkt_Num, data)))

        elif Pkt_Num == Old_Pkt_Num:
            if Pkt_Num * DataRate >=
os.path.getsize("files/"+self.usr_dict[client][FILENAME]):
                return EncodeAES(CIPHER,
                             str((-2, "File Transfer Complete")))
            try:
                f = open("files/"+self.usr_dict[client][FILENAME],
"rb")
            except IOError:
               return EncodeAES(CIPHER,
                             str((-3, "File Could Not be opened")))
            data = f.read((Pkt_Num+1 * DataRate))
            data = None
            data = binascii.b2a_base64(f.read(DataRate))
#<<<<<<<<!!!!!!!<<<<<<< reading from file
            f.close()
            self.usr_dict[client][PKT] = Pkt_Num +1

            return EncodeAES(CIPHER,
                            str((Pkt_Num+1, data)))

      else:

            return EncodeAES(CIPHER,
                             str((-3, "Incorrect Packet Requested")))



Thank you all for the help,  I know there are better ways and transfer
protocol modules to but I'd like to do this without them.

~Jordan


From python at mrabarnett.plus.com  Mon Mar 15 23:07:37 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 16 Mar 2010 03:07:37 +0000
Subject: Binary data transfer issue
In-Reply-To: <40c9fafc-a172-4c9c-ba21-35ac8a4029aa@z35g2000yqd.googlegroups.com>
References: <40c9fafc-a172-4c9c-ba21-35ac8a4029aa@z35g2000yqd.googlegroups.com>
Message-ID: <4B9EF5F9.5010005@mrabarnett.plus.com>

Jordan Apgar wrote:
> Hi all,
> 
> I'm trying to transfer a binary file over xmlrpclib.   My test file is
> a .jpeg file.  I can transfer all the data over but when I go to open
> the .jpeg I get "Error interpreting JPEG image file (Invalid JPEG file
> structure: SOS before SOF)"
> 
> here's the code:
> 
> ===========Various Shared Functions========
> #EncodeAES takes a Cipher c and encrypts a String s
> EncodeAES = lambda c, s: base64.b64encode(c.encrypt(pad(s)))
> 
> #DecodeAES takes a Cipher C and decrypts the cyphertext e
>     #then removes the padding from the decrypted string
> DecodeAES = lambda c, e:
> c.decrypt(base64.b64decode(e)).rstrip(PADDING)
> 
> 
> CIPHER = AES.new("KEY")
> 
> 
> # method to change strings back into tuples
> def stringToTuple(string):
>     if string[0] + string[-1] == "()":
>         items = string[1:-1]
>         items = items.split(',')
>         return items
>     else:
>         raise ValueError("Badly formatted string (missing brackets).")
> 
> ======client=================
>  def Download(self, FileName, Data_Size=1024):
>         ErrorCount = 0
>         Pkt_Num = -1
>         OldPkt_Num = Pkt_Num
>         localFile = open("files/"+FileName, "wb")
>         print
>         print "Requesting First Packet"
>         packet = self.client.download(EncodeAES(CIPHER, str(Pkt_Num)))
>         if packet[0] == "False":
>             print packet[1]
>             return False
>         packet = stringToTuple(DecodeAES(CIPHER, packet))
>         if int(packet[0]) == -3:
>             print "Received Error Packet"
>         else:
>             print "Received Packet: ", int(packet[0])
> 
>         print "packet[1], ", packet[2:-1]
> 
>         Pkt_Num = int(packet[0])
> 
>         while Pkt_Num >= 0 and ErrorCount <= 10:
>             if (OldPkt_Num +1) == Pkt_Num:
>                 OldPkt_Num = OldPkt_Num +1
>                 localFile.write(binascii.
>                                 a2b_base64(packet[1][2:-1]))
> #<<<<!!!!!<<< writing to the file on the client
>                 ErrorCount == 0
>             else:
>                 ErrorCount = ErrorCount +1
>                 Pkt_Num = OldPkt_Num
> 
>             print "Requesting Packet: ", Pkt_Num +1
>             packet = self.client.download(EncodeAES(CIPHER,
> str(Pkt_Num)))
>             packet = stringToTuple(DecodeAES(CIPHER, packet))
>             Pkt_Num = int(packet[0])
>             if int(packet[0]) == -3:
>                 print "Received Error Packet"
>             elif int(packet[0]) == -2:
>                 print "Received EOF"
>             else:
>                 print "Received Packet: ", int(packet[0])
> 
>         localFile.close()
> 
>         if Pkt_Num == -2:
>             print packet[1][2:-1]
>             return True
>         elif Pkt_Num == -3:
>             os.remove("files/"+FileName)
>             print packet[1][2:-1]
>             return False
>         else:
>             os.remove("files/"+FileName)
>             print "Unexpected Packet: File Transfer Stopped"
>             return False
> 
> 
> ==========Server Method=============
>     def download(self, Pkt_Num):
> 
>         Old_Pkt_Num = self.PKT
>         DataRate = self.DATA
>         Pkt_Num = int(DecodeAES(CIPHER,Pkt_Num))
>         if Pkt_Num == -1 and Old_Pkt_Num == -1:
>             Pkt_Num = 0
>             try:
>                 f = open("files/"+self.usr_dict[client][FILENAME],
> "rb")
>             except IOError:
>                 return EncodeAES(CIPHER,
>                                  str((-3, "File Could Not be
> opened")))
>              data = binascii.b2a_base64(f.read((Pkt_Num+1 *
> DataRate)))     #<<<<<<!!!!!!!<<<<<<<< reading from file

I don't understand what you're trying to do when you're reading from
the file. For a start:

     Pkt_Num+1 * DataRate

is the same as:

     Pkt_Num + (1 * DataRate)

or:

     Pkt_Num + DataRate

and that's how many bytes you're reading.

>             f.close()
>             self.usr_dict[client][PKT] = Pkt_Num
>             return EncodeAES(CIPHER,
>                              str((Pkt_Num, data)))
> 
>         elif Pkt_Num == Old_Pkt_Num:
>             if Pkt_Num * DataRate >=
> os.path.getsize("files/"+self.usr_dict[client][FILENAME]):
>                 return EncodeAES(CIPHER,
>                              str((-2, "File Transfer Complete")))
>             try:
>                 f = open("files/"+self.usr_dict[client][FILENAME],
> "rb")
>             except IOError:
>                return EncodeAES(CIPHER,
>                              str((-3, "File Could Not be opened")))
>             data = f.read((Pkt_Num+1 * DataRate))

Here you're reading:

     Pkt_Num + DataRate

bytes again,

>             data = None

discarding what you've just read,

>             data = binascii.b2a_base64(f.read(DataRate))
> #<<<<<<<<!!!!!!!<<<<<<< reading from file

and then reading:

     DataRate

more bytes.

I think what you meant to do is .seek to the position in the file and
then read some bytes:

     f.seek(Pkt_Num * DataRate)
     data = f.read(DataRate)

ie, send the contents of the file in chunks which are DataRate bytes
long (the last chunk will be shorter if the file size isn't a multiple
of DataRate bytes).

>             f.close()
>             self.usr_dict[client][PKT] = Pkt_Num +1
> 
>             return EncodeAES(CIPHER,
>                             str((Pkt_Num+1, data)))
> 
>       else:
> 
>             return EncodeAES(CIPHER,
>                              str((-3, "Incorrect Packet Requested")))
> 
> 
> 
> Thank you all for the help,  I know there are better ways and transfer
> protocol modules to but I'd like to do this without them.
> 
I'm not surprised that the transfer is failing! :-)


From googler.1.webmaster at spamgourmet.com  Mon Mar 15 23:15:37 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Mon, 15 Mar 2010 20:15:37 -0700 (PDT)
Subject: Build Python with XCode
Message-ID: <ad4dd1ba-8f4f-4bdf-9860-56c9c899889d@t41g2000yqt.googlegroups.com>

Hi,

I would like to build Python with Xcode (but without the makefile).
Does anyone know a link where I can get a real xcodeproj with the
current Py2.x sources?


Thanks in advance!! Bye, donnerCobra


From gagsl-py2 at yahoo.com.ar  Mon Mar 15 23:52:43 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 16 Mar 2010 00:52:43 -0300
Subject: converting datetime with tzinfo to unix timestamp
References: <4B9ACB2B.3090203@gmail.com>
Message-ID: <op.u9m6d5avx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 12 Mar 2010 20:15:55 -0300, Michael Torrie <torriem at gmail.com>  
escribi?:

> On Python 2.5 here.
>
> I've searched and searched but I can't find any way to convert a
> datetime object that includes a timezone (tzinfo) to a unix timestamp.
> Folks on the net say to simply use the timetuple() method of the object
> and feed that to time.mktime().  But that just doesn't seem to work for
> me.  At least if my understanding that the unix timestamp is always UTC.

Try time.mktime(datetimeobject.utctimetuple()) instead.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Tue Mar 16 01:50:29 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 16 Mar 2010 02:50:29 -0300
Subject: result of os.times() is different with 'time' command Options
References: <16861cbc-4460-4d67-ab46-ff03517173d4@g8g2000pri.googlegroups.com>
	<fc5rp5th2qkdadi43h1hsjoimh4e88nvp4@4ax.com>
	<61c563ad-f0c3-47ae-b689-36c397f88295@l11g2000pro.googlegroups.com>
Message-ID: <op.u9nbufzvx6zn5v@lepton.softlabbsas.com.ar>

En Mon, 15 Mar 2010 03:51:28 -0300, hiral <hiralsmaillist at gmail.com>  
escribi?:
> On Mar 15, 7:14 am, Tim Roberts <t... at probo.com> wrote:
>> hiral<hiralsmaill... at gmail.com> wrote:

>> >Output:
>> >real    0.0m0.0100000002421s
>> >user    0.0m0.0s
>> >sys     0.0m0.0s
>>
>> >Command:
>> >$ time ls
>>
>> >Output:
>> >real    0m0.007s
>> >user    0m0.000s
>> >sys     0m0.000s
>>
>> You can't really do an analysis like this with a task that only takes a  
>> few
>> milliseconds.  There are too many variables.
>
> Thanks for your explanation.

Have you tested with the highly recursive function in that 2007 thread you  
linked to?
This should take time enough to make a problem like this clearly visible.

-- 
Gabriel Genellina



From joshua.r.english at gmail.com  Tue Mar 16 02:01:07 2010
From: joshua.r.english at gmail.com (Josh English)
Date: Mon, 15 Mar 2010 23:01:07 -0700 (PDT)
Subject: Dynamic Class Creation
Message-ID: <b05e819c-a005-49d4-b0e7-78be9a56b268@q2g2000pre.googlegroups.com>

I have a large program with lots of data stored in XML. I'm upgrading
my GUI to use ObjectListView, but with my data in XML, I don't have
regular objects to interact with the OLV. I do have an XML validator
that defines the structure of the XML elements, and I'm trying to
dynamically create a class to wrap the XML element.

So, an element like:

<market code="WotF">
<title>Writers of the Future</title>
</market>

I want to create a class like:

class Market(object):
    def __init__(self, elem):
        self._elem = elem

    def get_code(self):
        return self._elem.get('code')

    def set_code(self, value):
        self._elem.set('code', value)

    def get_title(self):
        return self._elem.find('title').text

    def set_title(self, value):
        node = self._elem.find('title')
        node.text = value

Naturally, I don't want to hand code this for every interface but
would like to create them dynamically. (The laziness of programming, I
guess.)

I have tried several solutions that I found on various forums, but
they are all several years old.

Questions:

What's the best way to create these helper methods?

How can I attach them to the class and have it run?

I have had a few solutions work where I had a class with three methods
(get_code, get_tier, get_mail) but they all return the same value, not
the individual values.

----
Josh English






From gagsl-py2 at yahoo.com.ar  Tue Mar 16 02:16:54 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 16 Mar 2010 03:16:54 -0300
Subject: Reverse engineering CRC?
References: <7vj7fdFnnjU1@mid.individual.net> <kz88du.hk0@spenarnc.xs4all.nl>
	<4B9E0C1F.9020003@canterbury.ac.nz>
Message-ID: <op.u9nc2glox6zn5v@lepton.softlabbsas.com.ar>

En Mon, 15 Mar 2010 07:29:51 -0300, Gregory Ewing  
<greg.ewing at canterbury.ac.nz> escribi?:

> I've solved the problem now.
>
> It turned out to be a very standard CRC algorithm, complicated
> by the presence of a few extra bytes of data being checked that
> didn't appear explicitly in the file anywhere.
>
> In the process I developed some very general techniques for
> solving this kind of problem, which I've written about here
> if anyone's interested:
>
> http://www.cosc.canterbury.ac.nz/greg.ewing/essays/CRC-Reverse-Engineering.html

A good solution to an interesting problem - and very nicely explained too!

-- 
Gabriel Genellina



From clp2 at rebertia.com  Tue Mar 16 02:18:54 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Mon, 15 Mar 2010 23:18:54 -0700
Subject: Dynamic Class Creation
In-Reply-To: <b05e819c-a005-49d4-b0e7-78be9a56b268@q2g2000pre.googlegroups.com>
References: <b05e819c-a005-49d4-b0e7-78be9a56b268@q2g2000pre.googlegroups.com>
Message-ID: <50697b2c1003152318t7b9cd692pcf11ca45bbe1f041@mail.gmail.com>

On Mon, Mar 15, 2010 at 11:01 PM, Josh English
<joshua.r.english at gmail.com> wrote:
> I have a large program with lots of data stored in XML. I'm upgrading
> my GUI to use ObjectListView, but with my data in XML, I don't have
> regular objects to interact with the OLV. I do have an XML validator
> that defines the structure of the XML elements, and I'm trying to
> dynamically create a class to wrap the XML element.
>
> So, an element like:
>
> <market code="WotF">
> <title>Writers of the Future</title>
> </market>
>
> I want to create a class like:
>
> class Market(object):
> ? ?def __init__(self, elem):
> ? ? ? ?self._elem = elem
>
> ? ?def get_code(self):
> ? ? ? ?return self._elem.get('code')
>
> ? ?def set_code(self, value):
> ? ? ? ?self._elem.set('code', value)
>
> ? ?def get_title(self):
> ? ? ? ?return self._elem.find('title').text
>
> ? ?def set_title(self, value):
> ? ? ? ?node = self._elem.find('title')
> ? ? ? ?node.text = value
>
> Naturally, I don't want to hand code this for every interface but
> would like to create them dynamically. (The laziness of programming, I
> guess.)
>
> I have tried several solutions that I found on various forums, but
> they are all several years old.
>
> Questions:
>
> What's the best way to create these helper methods?

Nested functions:

def make_attr_getset(name):
    def get(self):
        return self._elem.get(name)

    def set(self, value):
        self._elem.set(name, value)
    return get, set

get_code, set_code = make_attr_getset('code')

def make_subelement_getset(name):
    def get(self):
        return self._elem.find(name).text

    def set(self, value):
        node = self._elem.find(name)
        node.text = value
    return get, set

get_title, set_title = make_subelement_getset('title')

> How can I attach them to the class and have it run?

Use properties and setattr():

class Market(object):
    def __init__(... #same as before

setattr(Market, 'code', property(get_code, set_code))
setattr(Market, 'title', property(get_title, set_title))

m = Market(the_XML)
print m.title #=> Writers of the Future
m.title = "Writers of the Past"
print m.code #=> WotF
m.code = "WofP"

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


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From: satyamrajuhyd at gmail.com (Earn money)
Date: Mon, 15 Mar 2010 23:44:17 -0700 (PDT)
Subject: Data entry Work available
Message-ID: <cfa11b0e-15c9-4be7-9448-25ba73abf387@p3g2000pra.googlegroups.com>

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From gagsl-py2 at yahoo.com.ar  Tue Mar 16 02:46:05 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 16 Mar 2010 03:46:05 -0300
Subject: time_struct
References: <23dbe409-60ed-4f6f-bd38-4336e4f1b3d0@f8g2000yqn.googlegroups.com>
Message-ID: <op.u9nee3alx6zn5v@lepton.softlabbsas.com.ar>

En Sun, 07 Mar 2010 10:50:59 -0300, moerchendiser2k3  
<googler.1.webmaster at spamgourmet.com> escribi?:

> can anyone tell me how to return a time_struct from the timemodule in
> my own C-Module?
> Is that possible? I can just find one function in timefuncs.h, but it
> doesnt return any PyObject.

The type is available as the struct_time attribute in the time module; you  
create an instance by calling it with a 9-items sequence.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Tue Mar 16 03:04:44 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 16 Mar 2010 04:04:44 -0300
Subject: xml-rpc
References: <4B9C9AF9.80609@gmail.com>
Message-ID: <op.u9ne96gqx6zn5v@lepton.softlabbsas.com.ar>

En Sun, 14 Mar 2010 05:14:49 -0300, ahmet erdinc yilmaz  
<ahmeterdinc09 at gmail.com> escribi?:

> Recenetly we are developing a senior project and decide to use xmlrpclib.
> However I have some questions. In the documentation I could not find any  
> clue about
> handling requests? Does the server handles each request in a separate  
> thread? Or is
> there some queuing mechanism for client calls? Thanks in advance.

xmlrpclib is a *client* library.
Python also provides an XMLRPC *server* in the SimpleXMLRPCServer module.  
It inherits from SocketServer.TCPServer. The default behavior is to  
process one request at a time, in a single process. You may alter such  
behavior by additionally inheriting from ForkingMixIn or ThreadingMixIn.

-- 
Gabriel Genellina



From no.email at nospam.invalid  Tue Mar 16 03:39:55 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Tue, 16 Mar 2010 00:39:55 -0700
Subject: affectation in if statement
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
Message-ID: <7x8w9s4svo.fsf@ruckus.brouhaha.com>

samb <sam.bancal at gmail.com> writes:
> or like :
>
> m = re.match(r'define\s+(\S+)\s*{$', line)
> if m:
>     thing = m.group(1)
> else:
>     m = re.match(r'include\s+(\S+)$', line)
>     if m:
>         thing = m.group(1)
>     else
>         thing = ""
>
> Which isn't nice neither because I'm going to have maybe 20 match
> tests and I wouldn't like to have 20 indentations.

for pat in [r'define\s+(\S+)\s*{$', r'include\s+(\S+)$', ...]:
   m = re.match(pat, line)
   ...


From ldo at geek-central.gen.new_zealand  Tue Mar 16 03:40:36 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 16 Mar 2010 20:40:36 +1300
Subject: import antigravity
Message-ID: <hnnclk$eud$1@lust.ihug.co.nz>

Subtle...


From sam.bancal at gmail.com  Tue Mar 16 03:45:34 2010
From: sam.bancal at gmail.com (samb)
Date: Tue, 16 Mar 2010 00:45:34 -0700 (PDT)
Subject: affectation in if statement
Message-ID: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>

Hi,

I'm trying to do something like :

if m = re.match(r'define\s+(\S+)\s*{$', line):
    thing = m.group(1)
elif m = re.match(r'include\s+(\S+)$', line):
    thing = m.group(1)
else
    thing = ""

But in fact I'm not allowed to affect a variable in "if" statement.
My code should then look like :

if re.match(r'define\s+(\S+)\s*{$', line):
    m = re.match(r'define\s+(\S+)\s*{$', line)
    thing = m.group(1)
elif re.match(r'include\s+(\S+)$', line):
    m = re.match(r'include\s+(\S+)$', line)
    thing = m.group(1)
else
    thing = ""

Which is not nice because I'm doing twice the same instruction
or like :

m = re.match(r'define\s+(\S+)\s*{$', line)
if m:
    thing = m.group(1)
else:
    m = re.match(r'include\s+(\S+)$', line)
    if m:
        thing = m.group(1)
    else
        thing = ""

Which isn't nice neither because I'm going to have maybe 20 match
tests and I wouldn't like to have 20 indentations.

Anyone a recommendation?

Thanks!


From steven at REMOVE.THIS.cybersource.com.au  Tue Mar 16 03:47:45 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 16 Mar 2010 07:47:45 GMT
Subject: subtraction is giving me a syntax error
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
	<mailman.800.1268675343.23598.python-list@python.org>
	<hnlt4p$4j1$1@reader1.panix.com>
	<4b9eb5bd$0$27822$c3e8da3@news.astraweb.com>
	<hnmduj$gnp$1@reader1.panix.com>
Message-ID: <pan.2010.03.16.07.47.45@REMOVE.THIS.cybersource.com.au>

On Mon, 15 Mar 2010 22:56:19 +0000, Grant Edwards wrote:

> On 2010-03-15, Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au>
> wrote:
>> On Mon, 15 Mar 2010 18:09:29 +0000, Grant Edwards wrote:
>>
>>>> Delete the character between "y_diff" and "H" and replace it with a
>>>> plain ASCII subtraction sign.
>>> 
>>> I think somebody needs to stop editing his code with MS Word and start
>>> using a programming editor. ;)
>>
>> I've had this error myself, and I've never used Word to edit code. It
>> can happen if you copy code from a website that "helpfully" converts
>> hyphens to en-dashes, spaces to non-breaking spaces, or inserts ctrl-Z
>> characters into strings, etc. They're a devil to debug.
> 
> Though it may not be Microsoft Word, I think I'd still maintain that an
> editor where you can't see a ctrl-Z or tell the difference between an
> ASCII minus and a windows-codepage-whatever isn't a very good
> programmer's editor.

Regarding ctrl-Z (or for that matter other control characters), I agree 
it's a lack.

As for not being able to see the difference between a hyphen and an EN-
dash, or minus sign, or whatever it is, yes but they are very similar 
looking glyphs in virtually ever modern font. It would take a good eye to 
see the difference between (say) ? ? and -.


-- 
Steven


From stefan_ml at behnel.de  Tue Mar 16 03:50:30 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 16 Mar 2010 08:50:30 +0100
Subject: extract occurrence of regular expression from elements of XML
	documents
In-Reply-To: <5444f9711003151016m39af59efg3ed38d2ac90f93c1@mail.gmail.com>
References: <5444f9711003151016m39af59efg3ed38d2ac90f93c1@mail.gmail.com>
Message-ID: <hnnd87$2oe$1@dough.gmane.org>

Martin Schmidt, 15.03.2010 18:16:
> I have just started to use Python a few weeks ago and until last week I had
> no knowledge of XML.
> Obviously my programming knowledge is pretty basic.
> Now I would like to use Python in combination with ca. 2000 XML documents
> (about 30 kb each) to search for certain regular expression within specific
> elements of these documents.

2000 * 30K isn't a huge problem, that's just 60M in total. If you just have 
to do it once, drop your performance concerns and just get a solution 
going. If you have to do it once a day, take care to use a tool that is not 
too resource consuming. If you have strict requirements to do it once a 
minute, use a fast machine with a couple of cores and do it in parallel. If 
you have a huge request workload and want to reverse index the XML to do 
all sorts of sophisticated queries on it, use a database instead.


> I would then like to record the number of occurrences of the regular
> expression within these elements.
> Moreover I would like to count the total number of words contained within
> these,

len(text.split()) will give you those.

BTW, is it document-style XML (with mixed content as in HTML) or is the 
text always withing a leaf element?


> and record the attribute of a higher level element that contains
> them.

An example would certainly help here.


> I was trying to figure out the best way how to do this, but got overwhelmed
> by the available information (e.g. posts using different approaches based on
> dom, sax, xpath, elementtree, expat).
> The outcome should be a file that lists the extracted attribute, the number
> of occurrences of the regular expression, and the total number of words.
> I did not find a post that addresses my problem.

Funny that you say that after stating that you were overwhelmed by the 
available information.


> If someone could help me with this I would really appreciate it.

Most likely, the solution with the best simplicity/performance trade-off 
would be xml.etree.cElementTree's iterparse(), intercept on each 
interesting tag name, and search its text/tail using the regexp. That's 
doable in a couple of lines.

But unless you provide more information, it's hard to give better advice.

Stefan



From stefan_ml at behnel.de  Tue Mar 16 03:51:58 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 16 Mar 2010 08:51:58 +0100
Subject: import antigravity
In-Reply-To: <hnnclk$eud$1@lust.ihug.co.nz>
References: <hnnclk$eud$1@lust.ihug.co.nz>
Message-ID: <hnndau$2oe$2@dough.gmane.org>

Lawrence D'Oliveiro, 16.03.2010 08:40:
> Subtle...

Absolutely.

   Python 2.4.6 (#2, Jan 21 2010, 23:45:25)
   [GCC 4.4.1] on linux2
   Type "help", "copyright", "credits" or "license" for more information.
   >>> import antigravity
   Traceback (most recent call last):
     File "<stdin>", line 1, in ?
   ImportError: No module named antigravity


Stefan



From clp2 at rebertia.com  Tue Mar 16 03:52:07 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 16 Mar 2010 00:52:07 -0700
Subject: import antigravity
In-Reply-To: <hnnclk$eud$1@lust.ihug.co.nz>
References: <hnnclk$eud$1@lust.ihug.co.nz>
Message-ID: <50697b2c1003160052m6358b020g6a65910c8d7af981@mail.gmail.com>

On Tue, Mar 16, 2010 at 12:40 AM, Lawrence D'Oliveiro
<ldo at geek-central.gen.new_zealand> wrote:
> Subtle...

You're a bit behind the times.
If my calculations are right, that comic is over 2 years old.

Cheers,
Chris


From clp2 at rebertia.com  Tue Mar 16 03:58:23 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 16 Mar 2010 00:58:23 -0700
Subject: affectation in if statement
In-Reply-To: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
Message-ID: <50697b2c1003160058t6ec2627ap42cfc7976f1bd2e4@mail.gmail.com>

On Tue, Mar 16, 2010 at 12:45 AM, samb <sam.bancal at gmail.com> wrote:
> Hi,
>
> I'm trying to do something like :
>
> if m = re.match(r'define\s+(\S+)\s*{$', line):
> ? ?thing = m.group(1)
> elif m = re.match(r'include\s+(\S+)$', line):
> ? ?thing = m.group(1)
> else
> ? ?thing = ""
>
> But in fact I'm not allowed to affect a variable in "if" statement.
> My code should then look like :
>
> if re.match(r'define\s+(\S+)\s*{$', line):
> ? ?m = re.match(r'define\s+(\S+)\s*{$', line)
> ? ?thing = m.group(1)
> elif re.match(r'include\s+(\S+)$', line):
> ? ?m = re.match(r'include\s+(\S+)$', line)
> ? ?thing = m.group(1)
> else
> ? ?thing = ""
>
> Which is not nice because I'm doing twice the same instruction
> or like :
>
> m = re.match(r'define\s+(\S+)\s*{$', line)
> if m:
> ? ?thing = m.group(1)
> else:
> ? ?m = re.match(r'include\s+(\S+)$', line)
> ? ?if m:
> ? ? ? ?thing = m.group(1)
> ? ?else
> ? ? ? ?thing = ""
>
> Which isn't nice neither because I'm going to have maybe 20 match
> tests and I wouldn't like to have 20 indentations.
>
> Anyone a recommendation?

def extract_thing(line):
    for regex in (r'define\s+(\S+)\s*{$', r'include\s+(\S+)$'):
        m = re.match(regex, line)
        if m: return m.group(1)
    return ""

Or if the real code is more complicated than your example:

def extract_thing(line):
    m = re.match(r'define\s+(\S+)\s*{$', line)
    if m: return m.group(1)

    m = re.match(r'include\s+(\S+)$', line)
    if m: return m.group(1)

    #etc...

    return ""

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


From gherron at islandtraining.com  Tue Mar 16 04:10:39 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Tue, 16 Mar 2010 01:10:39 -0700
Subject: affectation in if statement
In-Reply-To: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
Message-ID: <4B9F3CFF.8040209@islandtraining.com>

samb wrote:
> Hi,
>
> I'm trying to do something like :
>
> if m = re.match(r'define\s+(\S+)\s*{$', line):
>     thing = m.group(1)
> elif m = re.match(r'include\s+(\S+)$', line):
>     thing = m.group(1)
> else
>     thing = ""
>
> But in fact I'm not allowed to affect a variable in "if" statement.
> My code should then look like :
>
> if re.match(r'define\s+(\S+)\s*{$', line):
>     m = re.match(r'define\s+(\S+)\s*{$', line)
>     thing = m.group(1)
> elif re.match(r'include\s+(\S+)$', line):
>     m = re.match(r'include\s+(\S+)$', line)
>     thing = m.group(1)
> else
>     thing = ""
>
> Which is not nice because I'm doing twice the same instruction
> or like :
>
> m = re.match(r'define\s+(\S+)\s*{$', line)
> if m:
>     thing = m.group(1)
> else:
>     m = re.match(r'include\s+(\S+)$', line)
>     if m:
>         thing = m.group(1)
>     else
>         thing = ""
>
> Which isn't nice neither because I'm going to have maybe 20 match
> tests and I wouldn't like to have 20 indentations.
>
> Anyone a recommendation?
>   

Yes:  Use an array of regular expressions and a loop (untested):

exprs = ["...",
              "...",
              ]

thing = ""
for expr in exps:
      m = re.match(expr, line)
      if m:
         thing = m.group(1)
         break

> Thanks!
>   

Gary Herron



From clp2 at rebertia.com  Tue Mar 16 04:16:02 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 16 Mar 2010 01:16:02 -0700
Subject: import antigravity
In-Reply-To: <hnndau$2oe$2@dough.gmane.org>
References: <hnnclk$eud$1@lust.ihug.co.nz> <hnndau$2oe$2@dough.gmane.org>
Message-ID: <50697b2c1003160116p20e2e59v42996dd60241b47f@mail.gmail.com>

On Tue, Mar 16, 2010 at 12:51 AM, Stefan Behnel <stefan_ml at behnel.de> wrote:
> Lawrence D'Oliveiro, 16.03.2010 08:40:
>>
>> Subtle...
>
> Absolutely.
>
> ?Python 2.4.6 (#2, Jan 21 2010, 23:45:25)
> ?[GCC 4.4.1] on linux2
> ?Type "help", "copyright", "credits" or "license" for more information.
> ?>>> import antigravity
> ?Traceback (most recent call last):
> ? ?File "<stdin>", line 1, in ?
> ?ImportError: No module named antigravity

http://svn.python.org/view/python/trunk/Lib/antigravity.py?view=markup&pathrev=66902

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


From sam.bancal at gmail.com  Tue Mar 16 04:37:13 2010
From: sam.bancal at gmail.com (samb)
Date: Tue, 16 Mar 2010 01:37:13 -0700 (PDT)
Subject: affectation in if statement
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
	<mailman.823.1268727047.23598.python-list@python.org>
Message-ID: <5c361012-1f7b-487f-915b-0f564b238be3@e1g2000yqh.googlegroups.com>

Thanks for all those suggestions.
They are good!

1) Let's suppose now that instead of just affecting "thing =
m.group(1)", I need to do a piece of logic depending on which match I
entered...

2) Concerning the suggestion :
m = re.match(r'define\s+(\S+)\s*{$', line)
if m:
    thing = m.group(1)

m = re.match(r'include\s+(\S+)$', line)
if m:
    thing = m.group(1)

#etc...

It means that I'll do all the checks, even if the first one did match
and I know that the next will not...

Thanks again.


From rtw at rtw.me.uk  Tue Mar 16 04:52:45 2010
From: rtw at rtw.me.uk (Rob Williscroft)
Date: Tue, 16 Mar 2010 03:52:45 -0500
Subject: affectation in if statement
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
	<mailman.823.1268727047.23598.python-list@python.org>
	<5c361012-1f7b-487f-915b-0f564b238be3@e1g2000yqh.googlegroups.com>
Message-ID: <Xns9D3D5AC2F9726rtwfreenetREMOVEcouk@216.196.109.145>

samb wrote in news:5c361012-1f7b-487f-915b-0f564b238be3
@e1g2000yqh.googlegroups.com in comp.lang.python:

> Thanks for all those suggestions.
> They are good!
> 
> 1) Let's suppose now that instead of just affecting "thing =
> m.group(1)", I need to do a piece of logic depending on which match I
> entered...
> 
> 2) Concerning the suggestion :
> m = re.match(r'define\s+(\S+)\s*{$', line)
> if m:
>     thing = m.group(1)
> 
> m = re.match(r'include\s+(\S+)$', line)
> if m:
>     thing = m.group(1)
> 
> #etc...
> 
> It means that I'll do all the checks, even if the first one did match
> and I know that the next will not...
> 

Ths is how I did it when I had the need:

class ReMatch( object ):
  def __call__( self, pat, string ):
    import re
    self.match = re.match( pat, string )
    return self.match is not None

clip = ...

re = ReMatch()

if re( r'\s*TM(\d+)', clip ):
  ...    	
elif re( r'\s*(https?://.*)', clip ):
   ...
elif re( r'\d{12}$', clip ):
  ...

Rob.
-- 


From clp2 at rebertia.com  Tue Mar 16 04:53:33 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 16 Mar 2010 01:53:33 -0700
Subject: affectation in if statement
In-Reply-To: <5c361012-1f7b-487f-915b-0f564b238be3@e1g2000yqh.googlegroups.com>
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
	<mailman.823.1268727047.23598.python-list@python.org>
	<5c361012-1f7b-487f-915b-0f564b238be3@e1g2000yqh.googlegroups.com>
Message-ID: <50697b2c1003160153o5ca357eci986d40cadd05a06c@mail.gmail.com>

On Tue, Mar 16, 2010 at 1:37 AM, samb <sam.bancal at gmail.com> wrote:
> Thanks for all those suggestions.
> They are good!
<snip>
> 2) Concerning the suggestion :
> m = re.match(r'define\s+(\S+)\s*{$', line)
> if m:
> ? ?thing = m.group(1)
>
> m = re.match(r'include\s+(\S+)$', line)
> if m:
> ? ?thing = m.group(1)
>
> #etc...
>
> It means that I'll do all the checks, even if the first one did match
> and I know that the next will not...

Note how I split it out into a separate function and used `return
m.group(1)` to avoid that exact situation.

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


From bruno.42.desthuilliers at websiteburo.invalid  Tue Mar 16 05:04:10 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 16 Mar 2010 10:04:10 +0100
Subject: to pass self or not to pass self
In-Reply-To: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
Message-ID: <4b9f4984$0$10229$426a74cc@news.free.fr>

lallous a ?crit :
> Hello,
> 
> Learning Python from the help file and online resources can leave one
> with many gaps. Can someone comment on the following:

(snip code)

> Why in test1() when it uses the class variable func_tbl we still need
> to pass self, but in test2() we don't ?
> 
> What is the difference between the reference in 'F' and 'func_tbl' ?

Answer here:

http://wiki.python.org/moin/FromFunctionToMethod



From sam.bancal at gmail.com  Tue Mar 16 05:53:51 2010
From: sam.bancal at gmail.com (samb)
Date: Tue, 16 Mar 2010 02:53:51 -0700 (PDT)
Subject: affectation in if statement
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
	<mailman.823.1268727047.23598.python-list@python.org>
	<5c361012-1f7b-487f-915b-0f564b238be3@e1g2000yqh.googlegroups.com>
	<mailman.825.1268729621.23598.python-list@python.org>
Message-ID: <8680128a-70a8-4dae-869b-108203be781c@y17g2000yqd.googlegroups.com>

On Mar 16, 9:53?am, Chris Rebert <c... at rebertia.com> wrote:
> On Tue, Mar 16, 2010 at 1:37 AM, samb <sam.ban... at gmail.com> wrote:
> > Thanks for all those suggestions.
> > They are good!
> <snip>
> > 2) Concerning the suggestion :
> > m = re.match(r'define\s+(\S+)\s*{$', line)
> > if m:
> > ? ?thing = m.group(1)
>
> > m = re.match(r'include\s+(\S+)$', line)
> > if m:
> > ? ?thing = m.group(1)
>
> > #etc...
>
> Note how I split it out into a separate function and used `return
> m.group(1)` to avoid that exact situation.

Yes, you're right.
It's an interresting approach. I'll give it a try.

Cheers


From sam.bancal at gmail.com  Tue Mar 16 06:21:45 2010
From: sam.bancal at gmail.com (samb)
Date: Tue, 16 Mar 2010 03:21:45 -0700 (PDT)
Subject: affectation in if statement
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
	<mailman.823.1268727047.23598.python-list@python.org>
	<5c361012-1f7b-487f-915b-0f564b238be3@e1g2000yqh.googlegroups.com>
	<mailman.825.1268729621.23598.python-list@python.org>
	<8680128a-70a8-4dae-869b-108203be781c@y17g2000yqd.googlegroups.com>
Message-ID: <ce7d69e9-c62b-44ae-b12b-922bb27bf458@c16g2000yqd.googlegroups.com>

Hi,

I've found a work around, inspired from Rob Williscroft :

class ReMatch(object):
    """
        Object to be called :
        1st time : do a regexp.match and return the answer (args:
regexp, line)
        2nd time : return the previous result (args: prev)
    """
    def __call__(self, regexp='', line='', prev=False):
        if prev:
            return self.prev_match
        self.prev_match = re.match(regexp, line)
        return self.prev_match

re_match = ReMatch()

if re_match(r'define\s+(\S+)\s*{$', line):
    m = re_match(prev=True)
    # do some logic with m
elif re_match(r'include\s+(\S+)$', line):
    m = re_match(prev=True)
    # do some logic with m
else
    # do some logic

Hope this is efficient ... I guess yes.

Cheers,
Sam


From __peter__ at web.de  Tue Mar 16 06:45:40 2010
From: __peter__ at web.de (Peter Otten)
Date: Tue, 16 Mar 2010 11:45:40 +0100
Subject: affectation in if statement
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
	<mailman.823.1268727047.23598.python-list@python.org>
	<5c361012-1f7b-487f-915b-0f564b238be3@e1g2000yqh.googlegroups.com>
	<mailman.825.1268729621.23598.python-list@python.org>
	<8680128a-70a8-4dae-869b-108203be781c@y17g2000yqd.googlegroups.com>
	<ce7d69e9-c62b-44ae-b12b-922bb27bf458@c16g2000yqd.googlegroups.com>
Message-ID: <hnnng1$laf$02$1@news.t-online.com>

samb wrote:

> I've found a work around, inspired from Rob Williscroft :
> 
> class ReMatch(object):
>     """
>         Object to be called :
>         1st time : do a regexp.match and return the answer (args:
> regexp, line)
>         2nd time : return the previous result (args: prev)
>     """
>     def __call__(self, regexp='', line='', prev=False):
>         if prev:
>             return self.prev_match
>         self.prev_match = re.match(regexp, line)
>         return self.prev_match
> 
> re_match = ReMatch()
> 
> if re_match(r'define\s+(\S+)\s*{$', line):
>     m = re_match(prev=True)
>     # do some logic with m
> elif re_match(r'include\s+(\S+)$', line):
>     m = re_match(prev=True)
>     # do some logic with m
> else
>     # do some logic
> 
> Hope this is efficient ... I guess yes.

No; just accessing the prev_match attribute instead of passing a flag to the 
__call__() method is more efficient and easier to read. I think the latter 
is the relevant point...

Peter


From bruno.42.desthuilliers at websiteburo.invalid  Tue Mar 16 06:53:22 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 16 Mar 2010 11:53:22 +0100
Subject: affectation in if statement
In-Reply-To: <ce7d69e9-c62b-44ae-b12b-922bb27bf458@c16g2000yqd.googlegroups.com>
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
	<mailman.823.1268727047.23598.python-list@python.org>
	<5c361012-1f7b-487f-915b-0f564b238be3@e1g2000yqh.googlegroups.com>
	<mailman.825.1268729621.23598.python-list@python.org>
	<8680128a-70a8-4dae-869b-108203be781c@y17g2000yqd.googlegroups.com>
	<ce7d69e9-c62b-44ae-b12b-922bb27bf458@c16g2000yqd.googlegroups.com>
Message-ID: <4b9f631c$0$3618$426a74cc@news.free.fr>

samb a ?crit :
> Hi,
> 
> I've found a work around, inspired from Rob Williscroft :
> 
> class ReMatch(object):
>     """
>         Object to be called :
>         1st time : do a regexp.match and return the answer (args:
> regexp, line)
>         2nd time : return the previous result (args: prev)
>     """
>     def __call__(self, regexp='', line='', prev=False):
>         if prev:
>             return self.prev_match
>         self.prev_match = re.match(regexp, line)
>         return self.prev_match
> 
> re_match = ReMatch()
> 
> if re_match(r'define\s+(\S+)\s*{$', line):
>     m = re_match(prev=True)
>     # do some logic with m
> elif re_match(r'include\s+(\S+)$', line):
>     m = re_match(prev=True)
>     # do some logic with m
> else
>     # do some logic
> 
> Hope this is efficient ... I guess yes.

A direct attribute access is cheaper than a method call, and makes for a 
simpler API too:

class ReMatch(object):
      match = None

      def __call__(self, regexp, source):
          self.match = re.match(regexp, source)
          return self.match


re_match = ReMatch()

if re_match(r'define\s+(\S+)\s*{$', line):
      m = re_match.match
      # do some logic with m
elif re_match(r'include\s+(\S+)$', line):
       m = re_match.match
      # do some logic with m

My 2 cents...


From mail at hellmutweber.de  Tue Mar 16 06:54:49 2010
From: mail at hellmutweber.de (Hellmut Weber)
Date: Tue, 16 Mar 2010 11:54:49 +0100
Subject: A tool for find dependencies relationships behind Python projects
In-Reply-To: <f2c32233-ab42-40b4-87ec-89130eb18d86@c37g2000prb.googlegroups.com>
References: <e6cb616e-907c-4029-80cc-5f68a140e5ad@e19g2000prn.googlegroups.com>	<mailman.61.1266856327.4577.python-list@python.org>
	<f2c32233-ab42-40b4-87ec-89130eb18d86@c37g2000prb.googlegroups.com>
Message-ID: <4B9F6379.5040805@hellmutweber.de>

Am 24.02.2010 18:49, schrieb Victor Lin:
> On 2?23?, ??12?32?, Hellmut Weber<m... at hellmutweber.de>  wrote:
>> Hi Victor,
>> I would be intereseted to use your tool ;-)
>>
>> My system is Sabayon-5.1 on Lenovo T61.
>> Trying for the first time easy_install I get the following error:
>>
>> ====================
>>
>> root at sylvester ~ # easy_install gluttony
>> Searching for gluttony
>> Readinghttp://pypi.python.org/simple/gluttony/
>> Readinghttp://code.google.com/p/python-gluttony/
>> Best match: Gluttony 0.3
>>
>> Downloadinghttp://pypi.python.org/packages/source/G/Gluttony/Gluttony-0.3.zip#md...
>>
>> Processing Gluttony-0.3.zip
>> Running Gluttony-0.3/setup.py -q bdist_egg --dist-dir
>> /tmp/easy_install-uPz7qO/Gluttony-0.3/egg-dist-tmp-CJI_LD
>> Traceback (most recent call last):
>>     File "/usr/bin/easy_install", line 9, in<module>
>>       load_entry_point('distribute==0.6.8', 'console_scripts',
>> 'easy_install')()
>>     File
>> "/usr/lib64/python2.6/site-packages/setuptools/command/easy_install.py",
>> line 1708, in main
>>       with_ei_usage(lambda:
>>     File
>> "/usr/lib64/python2.6/site-packages/setuptools/command/easy_install.py",
>> line 1696, in with_ei_usage
>>       return f()
>>     File
>> "/usr/lib64/python2.6/site-packages/setuptools/command/easy_install.py",
>> line 1712, in<lambda>
>>       distclass=DistributionWithoutHelpCommands, **kw
>>     File "/usr/lib64/python2.6/distutils/core.py", line 152, in setup
>>       dist.run_commands()
>>     File "/usr/lib64/python2.6/distutils/dist.py", line 975, in run_commands
>>       self.run_command(cmd)
>>     File "/usr/lib64/python2.6/distutils/dist.py", line 995, in run_command
>>       cmd_obj.run()
>>     File
>> "/usr/lib64/python2.6/site-packages/setuptools/command/easy_install.py",
>> line 236, in run
>>       self.easy_install(spec, not self.no_deps)
>>     File
>> "/usr/lib64/python2.6/site-packages/setuptools/command/easy_install.py",
>> line 471, in easy_install
>>       return self.install_item(spec, dist.location, tmpdir, deps)
>>     File
>> "/usr/lib64/python2.6/site-packages/setuptools/command/easy_install.py",
>> line 501, in install_item
>>       dists = self.install_eggs(spec, download, tmpdir)
>>     File
>> "/usr/lib64/python2.6/site-packages/setuptools/command/easy_install.py",
>> line 680, in install_eggs
>>       return self.build_and_install(setup_script, setup_base)
>>     File
>> "/usr/lib64/python2.6/site-packages/setuptools/command/easy_install.py",
>> line 957, in build_and_install
>>       self.run_setup(setup_script, setup_base, args)
>>     File
>> "/usr/lib64/python2.6/site-packages/setuptools/command/easy_install.py",
>> line 946, in run_setup
>>       run_setup(setup_script, args)
>>     File "/usr/lib64/python2.6/site-packages/setuptools/sandbox.py", line
>> 29, in run_setup
>>       lambda: execfile(
>>     File "/usr/lib64/python2.6/site-packages/setuptools/sandbox.py", line
>> 70, in run
>>       return func()
>>     File "/usr/lib64/python2.6/site-packages/setuptools/sandbox.py", line
>> 31, in<lambda>
>>       {'__file__':setup_script, '__name__':'__main__'}
>>     File "setup.py", line 9, in<module>
>>     File "/tmp/easy_install-uPz7qO/Gluttony-0.3/gluttony/__init__.py",
>> line 1, in<module>
>>       #
>>     File "/tmp/easy_install-uPz7qO/Gluttony-0.3/gluttony/gluttony.py",
>> line 13, in<module>
>> ImportError: No module named pip.log
>> root at sylvester ~ #
>>
>> ====================
>>
>> I emerged app-misc/pip, but that didn't help, the error remains the same
>>
>> What is missing?
>>
>> Any help appreciated
>>
>> Best regards
>>
>> Hellmut
>>
>> Am 19.02.2010 17:16, schrieb Victor Lin:
>>
>>
>>
>>
>>
>>> Hi,
>>
>>> I just wrote a tool for drawing dependencies relationships diagram of
>>> Python project on Pypi.  Here is the home page of the tool:
>>
>>> http://code.google.com/p/python-gluttony/
>>
>>> Some examples:
>>> Sprox:
>>> http://static.ez2learn.com/gluttony/sprox_dot.png
>>
>>> TurboGears2:
>>> http://static.ez2learn.com/gluttony/tg2_dot.png
>>
>>> Hope this could be helpful :P
>>
>>> Regards.
>>> Victor Lin.
>>
>> --
>> Dr. Hellmut Weber         m... at hellmutweber.de
>> Degenfeldstra?e 2         tel   +49-89-3081172
>> D-80803 M?nchen-Schwabing mobil +49-172-8450321
>> please: No DOCs, no PPTs. why: tinyurl.com/cbgq
>
> Hi,
>
> That is a mistake I made in when I am making the distribute.  Thanks
> your reporting.  I have already fixed the problem and released
> Gluttony 0.4, and I tried to install that, it works fine.
>
> Victor Lin.

Hi Victor,
thanks for your message.
Sorry I'm so late to answer, I've been offline for a while and didn't 
remember not to have answered. ,-(

I downloaded Gluttony-0.4 and the installation was done in a few seconds.

It works just fine ;-)

Thanks for providing this tool

Cheers

Hellmut

-- 
Dr. Hellmut Weber         mail at hellmutweber.de
Degenfeldstra?e 2         tel   +49-89-3081172
D-80803 M?nchen-Schwabing mobil +49-172-8450321
please: No DOCs, no PPTs. why: tinyurl.com/cbgq




From jeanmichel at sequans.com  Tue Mar 16 06:56:11 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Tue, 16 Mar 2010 11:56:11 +0100
Subject: affectation in if statement
In-Reply-To: <ce7d69e9-c62b-44ae-b12b-922bb27bf458@c16g2000yqd.googlegroups.com>
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>	<mailman.823.1268727047.23598.python-list@python.org>	<5c361012-1f7b-487f-915b-0f564b238be3@e1g2000yqh.googlegroups.com>	<mailman.825.1268729621.23598.python-list@python.org>	<8680128a-70a8-4dae-869b-108203be781c@y17g2000yqd.googlegroups.com>
	<ce7d69e9-c62b-44ae-b12b-922bb27bf458@c16g2000yqd.googlegroups.com>
Message-ID: <4B9F63CB.1040708@sequans.com>

samb wrote:
> Hi,
>
> I've found a work around, inspired from Rob Williscroft :
>
> class ReMatch(object):
>     """
>         Object to be called :
>         1st time : do a regexp.match and return the answer (args:
> regexp, line)
>         2nd time : return the previous result (args: prev)
>     """
>     def __call__(self, regexp='', line='', prev=False):
>         if prev:
>             return self.prev_match
>         self.prev_match = re.match(regexp, line)
>         return self.prev_match
>
> re_match = ReMatch()
>
> if re_match(r'define\s+(\S+)\s*{$', line):
>     m = re_match(prev=True)
>     # do some logic with m
> elif re_match(r'include\s+(\S+)$', line):
>     m = re_match(prev=True)
>     # do some logic with m
> else
>     # do some logic
>
> Hope this is efficient ... I guess yes.
>
> Cheers,
> Sam
What do you mean by efficient ? If you're talking about speed, make sure 
you care about it before doing some optimization.
If you talk about readability then it is absolutely *not* efficient (to 
my humble opinion).

define, include = re.match(r'define\s+(\S+)\s*{$', line), 
re.match(r'include\s+(\S+)$', line)
if define:
    # do some stuff
elif include:
    # do some other stuff
else:
    # hello world
   

If you then have some speed problem with that script, you'll start 
caring about how to execute if faster by making sure that only necessary 
calls to re.match are done.

match = re.match(r'(define)\s+(\S+)\s*{$', line) or 
re.match(r'(include)\s+(\S+)$', line) # note that the second operand is 
executed only if the first is None

if match.group(1) == 'define':
    # do some stuff with match.group(2)

elif match.group(1) == 'include':
    # do some other stuff with match.group(2)

else:
    # hello world


JM


From hackingkk at gmail.com  Tue Mar 16 07:02:09 2010
From: hackingkk at gmail.com (hackingKK)
Date: Tue, 16 Mar 2010 16:32:09 +0530
Subject: any python libraries for rendering open office spreadsheet to html
Message-ID: <4B9F6531.5010604@gmail.com>

Hello,
Is there a python library which can render ods to html.
(I would even prefer javascript library to do this).
The reason I am more interested in a python library is because, I am 
developing a web application in pylons.
It is a financial software and initially on the desktop based client, I 
used odfpy to create spreadsheets.
But now I would want to render those sheets to the web front end.

Happy hacking.
Krishnakant.



From steve at REMOVE-THIS-cybersource.com.au  Tue Mar 16 07:46:51 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 16 Mar 2010 11:46:51 GMT
Subject: Understanding the CPython dict implementation
References: <mailman.768.1268610003.23598.python-list@python.org>
Message-ID: <4b9f6fab$0$27822$c3e8da3@news.astraweb.com>

On Sun, 14 Mar 2010 19:39:46 -0400, Terry Reedy wrote:

> I found this PyCon2010 presentation to be excellent: The Mighty
> Dictionary, Branden Craig Rhodes, 30 min.
> http://pycon.blip.tv/file/3264041/


Unfortunately, that clip seems to be unwatchable, at least for me. It 
crashed the Netscape plugin in Konqueror, and crashed Firefox. When I 
downloaded the ogv file, it crashed MPlayer and Kaffeine. Before 
crashing, in all four players, it displayed random blocks of colours and 
lines while the sound played.

Not a good advertisement for either BlipTV or Ogg :(


-- 
Steven



From googler.1.webmaster at spamgourmet.com  Tue Mar 16 07:52:37 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Tue, 16 Mar 2010 04:52:37 -0700 (PDT)
Subject: C-API PyObject_Call
Message-ID: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>

Hi,

i have a serious problem and I am looking for a solution. I pass an
instance of a class from a file to PyObject_Call. When something
fails, I get a full traceback. If it succeeds, I get the return value.

Is it possible to get information from which line/file the return
value of PyObject_Call is?

Thanks!!

moerchendiser2k3


From Ron.Barak at lsi.com  Tue Mar 16 07:54:01 2010
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Tue, 16 Mar 2010 11:54:01 +0000
Subject: How to add a library path to pythonpath ?
In-Reply-To: <mailman.62.1268737204.24845.python-list@python.org>
References: <mailman.62.1268737204.24845.python-list@python.org>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>

Hi,

I'm trying to add a library path to my pythonpath, but seems it is not accepted -

On Windows DOS window:

C:\>echo %PYTHONPATH%
c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\

C:\>python -c "import sys ; print sys.path"
['', 'c:\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib', 'C:\\WINDOWS\\syst
em32\\python26.zip', 'C:\\Python26\\DLLs', 'C:\\Python26\\lib', 'C:\\Python26\\l
ib\\plat-win', 'C:\\Python26\\lib\\lib-tk', 'C:\\Python26', 'C:\\Python26\\lib\\
site-packages', 'C:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']

C:\>

On Windows cygwin:

$ echo $PYTHONPATH
.:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/

$ python -c "import sys ; print sys.path"
['', '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib', 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs', 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win', 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26', 'c:\\Python26\\lib\\site-packages', 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']

$

What am I doing wrong ?

Thanks,
Ron.


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From eckhardt at satorlaser.com  Tue Mar 16 07:56:36 2010
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Tue, 16 Mar 2010 12:56:36 +0100
Subject: import antigravity
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
Message-ID: <k88477-giu.ln1@satorlaser.homedns.org>

Chris Rebert wrote:
> You're a bit behind the times.
> If my calculations are right, that comic is over 2 years old.

import timetravel

Uli



From Ron.Barak at lsi.com  Tue Mar 16 07:56:47 2010
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Tue, 16 Mar 2010 11:56:47 +0000
Subject: Recall: How to add a library path to pythonpath ?
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF684F3C839@enbmail01.lsi.com>

Barak, Ron would like to recall the message, "How to add a library path to pythonpath ?".

From jan at jandecaluwe.com  Tue Mar 16 08:10:09 2010
From: jan at jandecaluwe.com (Jan Decaluwe)
Date: Tue, 16 Mar 2010 13:10:09 +0100
Subject: The first ASIC designed with MyHDL
Message-ID: <4b9f7414$0$2887$ba620e4c@news.skynet.be>

I am proud to report on the first ASIC product
designed with MyHDL (afaik).

http://www.jandecaluwe.com/hdldesign/digmac.html

-- 
Jan Decaluwe - Resources bvba - http://www.jandecaluwe.com
 Python as a HDL: http://www.myhdl.org
 VHDL development, the modern way: http://www.sigasi.com
 Analog design automation: http://www.mephisto-da.com
 World-class digital design: http://www.easics.com


From clp2 at rebertia.com  Tue Mar 16 08:13:20 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 16 Mar 2010 05:13:20 -0700
Subject: import antigravity
In-Reply-To: <k88477-giu.ln1@satorlaser.homedns.org>
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
	<k88477-giu.ln1@satorlaser.homedns.org>
Message-ID: <50697b2c1003160513y7bf2dd8ew9020ddf76f048121@mail.gmail.com>

On Tue, Mar 16, 2010 at 4:56 AM, Ulrich Eckhardt
<eckhardt at satorlaser.com> wrote:
> Chris Rebert wrote:
>> You're a bit behind the times.
>> If my calculations are right, that comic is over 2 years old.
>
> import timetravel
>
> Uli

So that's where Guido's been hiding his infamous time machine! Right
in plain sight!
It's so obvious in retrospect.

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


From alfps at start.no  Tue Mar 16 08:13:26 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Tue, 16 Mar 2010 13:13:26 +0100
Subject: import antigravity
In-Reply-To: <k88477-giu.ln1@satorlaser.homedns.org>
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
	<k88477-giu.ln1@satorlaser.homedns.org>
Message-ID: <hnnslb$pqp$1@news.eternal-september.org>

* Ulrich Eckhardt:
> Chris Rebert wrote:
>> You're a bit behind the times.
>> If my calculations are right, that comic is over 2 years old.
> 
> import timetravel

   C:\test> python
   Python 3.1.1 (r311:74483, Aug 17 2009, 17:02:12) [MSC v.1500 32 bit (Intel)]
   on win32
   Type "help", "copyright", "credits" or "license" for more information.
   >>> import time
   >>> time.altzone
   -7200
   >>> # hm.
   ...
   >>> _


Cheers,

- Alf


From rikutheronin at gmail.com  Tue Mar 16 08:27:22 2010
From: rikutheronin at gmail.com (Pablo Recio Quijano)
Date: Tue, 16 Mar 2010 13:27:22 +0100
Subject: How to add a library path to pythonpath ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>
References: <mailman.62.1268737204.24845.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>
Message-ID: <1fb1c371003160527q10add6bfk75c09b24bc486329@mail.gmail.com>

You have to add yout path to the list:

import sys
sys.path.append(your_path)

Jus simple to add the element on the list :)

2010/3/16 Barak, Ron <Ron.Barak at lsi.com>

>  Hi,
>
> I'm trying to add a library path to my pythonpath, but seems it is not
> accepted -
>
> On Windows DOS window:
>
> C:\>echo %PYTHONPATH%
> c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\
>
> C:\>python -c "import sys ; print sys.path"
> ['', 'c:\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
> 'C:\\WINDOWS\\syst
> em32\\python26.zip', 'C:\\Python26\\DLLs', 'C:\\Python26\\lib',
> 'C:\\Python26\\l
> ib\\plat-win', 'C:\\Python26\\lib\\lib-tk', 'C:\\Python26',
> 'C:\\Python26\\lib\\
> site-packages', 'C:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
>
> C:\>
>
> On Windows cygwin:
>
> $ echo $PYTHONPATH
> .:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
>
> $ python -c "import sys ; print sys.path"
> ['', '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
> 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs',
> 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win',
> 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26',
> 'c:\\Python26\\lib\\site-packages',
> 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
>
> $
>
> What am I doing wrong ?
>
> Thanks,
> Ron.
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


-- 
Pablo Recio Quijano

Estudiante de Ingenier?a Inform?tica (UCA)
Alumno colaborador del Departamento de Lenguajes y Sistemas Inform?ticos
Participante del IV Concurso Universitario de Software Libre
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From davea at ieee.org  Tue Mar 16 08:35:54 2010
From: davea at ieee.org (Dave Angel)
Date: Tue, 16 Mar 2010 07:35:54 -0500
Subject: class inheritance
In-Reply-To: <7088c1e1-9a1f-42d8-aac2-5ba19806165a@o30g2000yqb.googlegroups.com>
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>	<9bb4c1e7-858e-4ee6-870b-5a6549b6c496@b36g2000pri.googlegroups.com>
	<05d0d40f-3fa0-4095-875d-777b49122d12@l12g2000prg.googlegroups.com>
	<7088c1e1-9a1f-42d8-aac2-5ba19806165a@o30g2000yqb.googlegroups.com>
Message-ID: <4B9F7B2A.1080906@ieee.org>



Carl Banks wrote:
> On Mar 15, 4:34 pm, JLundell <jlund... at pobox.com> wrote:
>   
>> It's also unfortunate that Python doesn't have an approximately-equal
>> operator; it'd come in handy for floating-point applications while
>> preserving hash. If only there were a ~=r ? operator I could
>> overload. And ~ is unary, so no joy.
>>     
>
> One problem with it is that there's no way to make it universal;
> different appiplications have different ideas of close.  Conceivably
> it could be usefully defined for a user type though..
>
> Bacause of this problem almost no languages have an almost equal
> operator.  I'm curious what languages do, of if there are any with a
> trinary operator that also takes a threshold.
>
> Carl Banks
>
>   
If I recall correctly, APL has a *fuzz* value, which is used in all(?) 
comparisons. But I do not recall anything about how it was defined. I do 
recall that you could change the threshold, and suspect it was relative 
to the operands. For symmetry, it would probably have to be relative to 
the average of the two values, or some such.


From basaka.chen at gmail.com  Tue Mar 16 08:53:35 2010
From: basaka.chen at gmail.com (freakrobot)
Date: Tue, 16 Mar 2010 05:53:35 -0700 (PDT)
Subject: what's the diffence between "RECENT" and "UNSEEN" in imaplib?
Message-ID: <2583d700-db3c-4291-ae18-46f96b02a92d@s25g2000prd.googlegroups.com>

When I work with the imaplib,
there is a imap4.status(mailboxname, '(MESSAGES RECENT UNSEEN)')
function.

So I really wonder what's the difference between RECENT and UNSEEN
conditions.
And what kind of messages belong to RECENT condition?
Thank you~


From dmj.ccc at gmail.com  Tue Mar 16 08:57:05 2010
From: dmj.ccc at gmail.com (david jensen)
Date: Tue, 16 Mar 2010 05:57:05 -0700 (PDT)
Subject: Searching for most pythonic/least stupid way to do something simple
Message-ID: <d62c4091-e0f0-4195-9b0e-dd597f9d0131@u9g2000yqb.googlegroups.com>

Hi all,

This may be a complete brainfart, but it's been puzzling me for a day
or two (!).
Sorry for not describing "something" in the subject, but it's hard to
describe succinctly:

I have a short list of non-zero positive integers (say
myList=[2,5,8,3,5]). I need to return five lists of non-negative
numbers, such that for five different "share sizes", myList[0] and
myList[1] will share twice the smaller amount...

def getOutcomes():
    outcomes=[]
    if myList[0]<=myList[1]:
        amountToShare=2*myList[0]
        remainder=myList[1]-myList[0]
        outcome.append((amountToShare, remainder)+myList[2:])   #
shares are (100%, 0)
        outcome.append((amountToShare*0.75, remainder
+amountToShare*0.25)+myList[2:])   #shares are (75%, 25%), and exactly
the same for (50%,50%), (25%, 75%), and (0,100%)
...
...
    return outcomes

i.e. for the above myList, outcomes=[[4,1,8,3,5], [3,2,8,3,5],
[2,5,8,3,5],[1,6,8,3,5],[0,7,8,3,5]]

if myList[0]>myList[1], i want exactly the opposite to happen (i.e.,
just switching what happens to positions 0 and 1)

Obviously, i can just write the code again, in an else, switching
indices 0 and 1. Or, I could just have a test at the beginning, switch
them if they are in the order "big, small", and then switch them again
at the end in a list comprehension. Both ideas seem terribly silly,
and there must be an obvious way to do it that I'm not seeing.

any help?

many thanks

dmj


From motoom at xs4all.nl  Tue Mar 16 09:00:41 2010
From: motoom at xs4all.nl (Michiel Overtoom)
Date: Tue, 16 Mar 2010 14:00:41 +0100
Subject: Understanding the CPython dict implementation
In-Reply-To: <4b9f6fab$0$27822$c3e8da3@news.astraweb.com>
References: <mailman.768.1268610003.23598.python-list@python.org>
	<4b9f6fab$0$27822$c3e8da3@news.astraweb.com>
Message-ID: <B11E9EC5-3187-44B2-8182-930AB92AC6A5@xs4all.nl>


On 16 Mar 2010, at 12:46 , Steven D'Aprano wrote:

> On Sun, 14 Mar 2010 19:39:46 -0400, Terry Reedy wrote:
> 
>> I found this PyCon2010 presentation to be excellent: The Mighty
>> Dictionary, Branden Craig Rhodes, 30 min.
>> http://pycon.blip.tv/file/3264041/
> 
> 
> Unfortunately, that clip seems to be unwatchable, at least for me. It 
> crashed the Netscape plugin in Konqueror, and crashed Firefox. When I 
> downloaded the ogv file, it crashed MPlayer and Kaffeine.

It played in VLC without problems.

Greetings,




From dmj.ccc at gmail.com  Tue Mar 16 09:05:30 2010
From: dmj.ccc at gmail.com (david jensen)
Date: Tue, 16 Mar 2010 06:05:30 -0700 (PDT)
Subject: Searching for most pythonic/least stupid way to do something 
	simple
References: <d62c4091-e0f0-4195-9b0e-dd597f9d0131@u9g2000yqb.googlegroups.com>
Message-ID: <dad44252-fcff-4f4b-9182-e52c28332cc6@g10g2000yqh.googlegroups.com>

... and of course i screwed up my outcomes... that should read
outcomes=[[4,3,8,3,5],[3,4,8,3,5],[2,5,8,3,5],[1,6,8,3,5],[0,7,8,3,5]]





From kw at codebykevin.com  Tue Mar 16 09:22:29 2010
From: kw at codebykevin.com (Kevin Walzer)
Date: Tue, 16 Mar 2010 09:22:29 -0400
Subject: Build Python with XCode
In-Reply-To: <ad4dd1ba-8f4f-4bdf-9860-56c9c899889d@t41g2000yqt.googlegroups.com>
References: <ad4dd1ba-8f4f-4bdf-9860-56c9c899889d@t41g2000yqt.googlegroups.com>
Message-ID: <2c74f$4b9f8616$4275d90a$4845@FUSE.NET>

On 3/15/10 11:15 PM, moerchendiser2k3 wrote:
> Hi,
>
> I would like to build Python with Xcode (but without the makefile).
> Does anyone know a link where I can get a real xcodeproj with the
> current Py2.x sources?
>
>
> Thanks in advance!! Bye, donnerCobra

I don't think one exists--I build my Python on OS Xwith configure, make 
etc.-- but you could try asking on the MacPython list.

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


From chris at simplistix.co.uk  Tue Mar 16 09:47:12 2010
From: chris at simplistix.co.uk (Chris Withers)
Date: Tue, 16 Mar 2010 13:47:12 +0000
Subject: converting a timezone-less datetime to seconds since the epoch
Message-ID: <4B9F8BE0.2050808@simplistix.co.uk>

Hi All,

We have a bunch of datetime objects that have tzinfo=None.
We want to turn them into float timestamps in seconds since the epoch.

Here's the first attempt:

import time
from datetime import datetime
from unittest import TestCase

def timestamp(dttm):
     return time.mktime(dttm.timetuple())

class Test(TestCase):

     def check(self,*args):
         epoch = datetime.utcfromtimestamp(0)
         dt = datetime(*args)
         actual = timestamp(dt)
         d = dt - epoch
         expected = d.seconds + 60*60*24*d.days
         self.assertEquals(expected,actual,
             '%s != %s (diff %s)'%(expected,actual,expected-actual))

     def test_xmas(self):
         self.check(2009, 12, 25, 1, 2, 3, 456789)

     def test_midsummer(self):
         self.check(2009, 6, 21, 2, 3, 4, 5678)

For me, test_midsummer fails. I'd be interested in knowing wheher both 
tests pass for other people.

I'd be *more* interested in knowing either why the timestamp function or 
the tests are wrong and how to correct them...

cheers,

Chris



From pruebauno at latinmail.com  Tue Mar 16 09:48:11 2010
From: pruebauno at latinmail.com (nn)
Date: Tue, 16 Mar 2010 06:48:11 -0700 (PDT)
Subject: Searching for most pythonic/least stupid way to do something 
	simple
References: <d62c4091-e0f0-4195-9b0e-dd597f9d0131@u9g2000yqb.googlegroups.com>
	<dad44252-fcff-4f4b-9182-e52c28332cc6@g10g2000yqh.googlegroups.com>
Message-ID: <53f1fd53-7f83-418d-b3f8-ced6f2e929af@g10g2000yqh.googlegroups.com>



david jensen wrote:
> ... and of course i screwed up my outcomes... that should read
> outcomes=[[4,3,8,3,5],[3,4,8,3,5],[2,5,8,3,5],[1,6,8,3,5],[0,7,8,3,5]]

For starters:

def getOutcomes(myList=[2,5,8,3,5]):
   low_id = int(myList[0]>myList[1])
   amountToShare = 2*myList[low_id]
   remainder = myList[not low_id]-myList[low_id]
   tail=myList[2:]
   outcomes = [[amountToShare*perc, remainder+amountToShare*(1-perc)]
+ tail
             for perc in (1.0, 0.75, 0.5, 0.25, 0.0)]
   return outcomes


From clp2 at rebertia.com  Tue Mar 16 09:57:14 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 16 Mar 2010 06:57:14 -0700
Subject: what's the diffence between "RECENT" and "UNSEEN" in imaplib?
In-Reply-To: <2583d700-db3c-4291-ae18-46f96b02a92d@s25g2000prd.googlegroups.com>
References: <2583d700-db3c-4291-ae18-46f96b02a92d@s25g2000prd.googlegroups.com>
Message-ID: <50697b2c1003160657g22596349j5f4fb83382e90266@mail.gmail.com>

On Tue, Mar 16, 2010 at 5:53 AM, freakrobot <basaka.chen at gmail.com> wrote:
> When I work with the imaplib,
> there is a imap4.status(mailboxname, '(MESSAGES RECENT UNSEEN)')
> function.
>
> So I really wonder what's the difference between RECENT and UNSEEN
> conditions.
> And what kind of messages belong to RECENT condition?

A. Your question is not Python-specific and would better have been
asked somewhere more relevant.

B. RTFRFC: http://www.faqs.org/rfcs/rfc3501.html
"""
UNSEEN The number of messages which do not have the \Seen flag set.
[...]

\Seen
           Message has been read

\Recent
           Message is "recently" arrived in this mailbox. This session
is the first session to have been notified about this message; if the
session is read-write, subsequent sessions will not see \Recent set
for this message. This flag can not be altered by the client. If it is
not possible to determine whether or not this session is the first
session to be notified about a message, then that message SHOULD be
considered recent. If multiple connections have the same mailbox
selected simultaneously, it is undefined which of these connections
will see newly-arrived messages with \Recent set and which will see it
without \Recent set.
"""

Regards,
Chris
--
http://blog.rebertia.com


From clp2 at rebertia.com  Tue Mar 16 10:13:04 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 16 Mar 2010 07:13:04 -0700
Subject: converting a timezone-less datetime to seconds since the epoch
In-Reply-To: <4B9F8BE0.2050808@simplistix.co.uk>
References: <4B9F8BE0.2050808@simplistix.co.uk>
Message-ID: <50697b2c1003160713x7641d2cfn52a5e5ca199e26de@mail.gmail.com>

On Tue, Mar 16, 2010 at 6:47 AM, Chris Withers <chris at simplistix.co.uk> wrote:
> Hi All,
>
> We have a bunch of datetime objects that have tzinfo=None.
> We want to turn them into float timestamps in seconds since the epoch.
>
> Here's the first attempt:
>
> import time
> from datetime import datetime
> from unittest import TestCase
>
> def timestamp(dttm):
> ? ?return time.mktime(dttm.timetuple())

from calendar import timegm

def timestamp(dttm):
    return timegm(dttm.utctimetuple())
#the *utc*timetuple change is just for extra consistency
#it shouldn't actually make a difference here

And problem solved. As for what the problem was:

Paraphrasing the table I got added to the time module docs:
(http://docs.python.org/library/time.html)

To convert from struct_time in ***UTC***
to seconds since the epoch
use calendar.timegm()

To convert struct_time in ***local*** time
to seconds since the epoch
use time.mktime()

> I'd be *more* interested in knowing either why the timestamp function or the
> tests are wrong and how to correct them...

You used a function intended for local times on UTC time data, and
therefore got incorrect results.

Cheers,
Chris
--
Entering the workforce in 2012
http://blog.rebertia.com


From invalid at invalid.invalid  Tue Mar 16 10:20:26 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Tue, 16 Mar 2010 14:20:26 +0000 (UTC)
Subject: subtraction is giving me a syntax error
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
	<mailman.800.1268675343.23598.python-list@python.org>
	<hnlt4p$4j1$1@reader1.panix.com>
	<4b9eb5bd$0$27822$c3e8da3@news.astraweb.com>
	<hnmduj$gnp$1@reader1.panix.com>
	<pan.2010.03.16.07.47.45@REMOVE.THIS.cybersource.com.au>
Message-ID: <hno43a$lh8$1@reader1.panix.com>

On 2010-03-16, Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:

>> Though it may not be Microsoft Word, I think I'd still maintain that
>> an editor where you can't see a ctrl-Z or tell the difference between
>> an ASCII minus and a windows-codepage-whatever isn't a very good
>> programmer's editor.
>
> Regarding ctrl-Z (or for that matter other control characters), I
> agree it's a lack.
>
> As for not being able to see the difference between a hyphen and an
> EN- dash, or minus sign, or whatever it is, yes but they are very
> similar looking glyphs in virtually ever modern font. It would take a
> good eye to see the difference between (say) ??? ??? and -.

My point is that if it's an ASCII file, then rendering \x96 as an
em-dash isn't correct.  I'd expect it to show up highlighted somehow
in hex or octal so that I know it's a non-ASCII character.

-- 
Grant Edwards               grant.b.edwards        Yow! We are now enjoying
                                  at               total mutual interaction in
                              gmail.com            an imaginary hot tub ...


From steve at holdenweb.com  Tue Mar 16 10:24:36 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 16 Mar 2010 10:24:36 -0400
Subject: C-API PyObject_Call
In-Reply-To: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
Message-ID: <hno4b7$llt$1@dough.gmane.org>

moerchendiser2k3 wrote:
> Hi,
> 
> i have a serious problem and I am looking for a solution. I pass an
> instance of a class from a file to PyObject_Call. When something
> fails, I get a full traceback. If it succeeds, I get the return value.
> 
> Is it possible to get information from which line/file the return
> value of PyObject_Call is?
> 
> Thanks!!
> 
> moerchendiser2k3

You'll need to use a debugger like gdb that gives you access to the C
stack, I believe.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From Ron.Barak at lsi.com  Tue Mar 16 10:26:50 2010
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Tue, 16 Mar 2010 14:26:50 +0000
Subject: How to add a library path to pythonpath ?
In-Reply-To: <1fb1c371003160527q10add6bfk75c09b24bc486329@mail.gmail.com>
References: <mailman.62.1268737204.24845.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>
	<1fb1c371003160527q10add6bfk75c09b24bc486329@mail.gmail.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF684F3C883@enbmail01.lsi.com>

Thanks for the suggestion Pable.

However, I really need the $PYTHONPATH to include this additional library, so all Python scripts could use it.

In Windows I have defined PYTHONPATH as c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\, and also in the Windows registry I have

HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\version\PythonPath\ as C:\Python26\Lib;C:\Python26\DLLs;C:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\;C:\Python26\Lib\lib-tk;

However, even with all the above, the SVMInspecor modules are not found.

Bye,
Ron.

________________________________
From: Pablo Recio Quijano [mailto:rikutheronin at gmail.com]
Sent: Tuesday, March 16, 2010 2:27 PM
To: python-list at python.org
Subject: Re: How to add a library path to pythonpath ?

You have to add yout path to the list:

import sys
sys.path.append(your_path)

Jus simple to add the element on the list :)

2010/3/16 Barak, Ron <Ron.Barak at lsi.com<mailto:Ron.Barak at lsi.com>>

Hi,

I'm trying to add a library path to my pythonpath, but seems it is not accepted -

On Windows DOS window:

C:\>echo %PYTHONPATH%
c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\

C:\>python -c "import sys ; print sys.path"
['', 'c:\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib', 'C:\\WINDOWS\\syst
em32\\python26.zip', 'C:\\Python26\\DLLs', 'C:\\Python26\\lib', 'C:\\Python26\\l
ib\\plat-win', 'C:\\Python26\\lib\\lib-tk', 'C:\\Python26', 'C:\\Python26\\lib\\
site-packages', 'C:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']

C:\>

On Windows cygwin:

$ echo $PYTHONPATH
.:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/

$ python -c "import sys ; print sys.path"
['', '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib', 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs', 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win', 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26', 'c:\\Python26\\lib\\site-packages', 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']

$

What am I doing wrong ?

Thanks,
Ron.



--
http://mail.python.org/mailman/listinfo/python-list




--
Pablo Recio Quijano

Estudiante de Ingenier?a Inform?tica (UCA)
Alumno colaborador del Departamento de Lenguajes y Sistemas Inform?ticos
Participante del IV Concurso Universitario de Software Libre
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From grflanagan at gmail.com  Tue Mar 16 10:28:17 2010
From: grflanagan at gmail.com (Gerard Flanagan)
Date: Tue, 16 Mar 2010 14:28:17 +0000
Subject: Searching for most pythonic/least stupid way to do something
	simple
In-Reply-To: <dad44252-fcff-4f4b-9182-e52c28332cc6@g10g2000yqh.googlegroups.com>
References: <d62c4091-e0f0-4195-9b0e-dd597f9d0131@u9g2000yqb.googlegroups.com>
	<dad44252-fcff-4f4b-9182-e52c28332cc6@g10g2000yqh.googlegroups.com>
Message-ID: <hno4i2$ncn$1@dough.gmane.org>

david jensen wrote:
> ... and of course i screwed up my outcomes... that should read
> outcomes=[[4,3,8,3,5],[3,4,8,3,5],[2,5,8,3,5],[1,6,8,3,5],[0,7,8,3,5]]
> 
> 
> 

abstracting the given algorithm:

def iterweights(N):
     d = 1.0/(N-1)
     for i in xrange(N):
         yield i*d, (N-1-i)*d

def iterparts(x0, x1, N):
     a = min(x0, x1)
     b = max(x0, x1)
     s = 2 * a
     t = b - a
     for m, n in iterweights(N):
         if a == x0:
             yield s*m, s*n+t
         else:
             yield s*n+t, s*m

for p in iterparts(2, 5, 5):
     print p

print

for p in iterparts(5, 2, 5):
     print p

(0.0, 7.0)
(1.0, 6.0)
(2.0, 5.0)
(3.0, 4.0)
(4.0, 3.0)

(7.0, 0.0)
(6.0, 1.0)
(5.0, 2.0)
(4.0, 3.0)
(3.0, 4.0)



From Dieter.Faulbaum at bessy.de  Tue Mar 16 10:30:51 2010
From: Dieter.Faulbaum at bessy.de (Dieter Faulbaum)
Date: Tue, 16 Mar 2010 15:30:51 +0100
Subject: cycling through options
Message-ID: <rie7hpcs5ic.fsf@alder.acc.bessy.de>


Hello,

is there a better way for cycling through all options than this:


(options, args) = parser.parse_args()
for opt in options.__dict__.keys():
     print opt, ":", options.__dict__[opt]


Thanks for any nicer solution

-- 
Dieter Faulbaum


From steve at holdenweb.com  Tue Mar 16 10:31:02 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 16 Mar 2010 10:31:02 -0400
Subject: How to add a library path to pythonpath ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>
References: <mailman.62.1268737204.24845.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>
Message-ID: <hno4na$o98$1@dough.gmane.org>

Barak, Ron wrote:
> Hi,
> 
> I'm trying to add a library path to my pythonpath, but seems it is not
> accepted -
> 
> On Windows DOS window:
> 
> C:\>echo %PYTHONPATH%
> c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\
>  
That looks like it should work. The only thing I notice is that I don't
have a trailing backslash on my Windows PYTHONPATH. Could that be the
problem?

regards
 Steve

> C:\>python -c "import sys ; print sys.path"
> ['', 'c:\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
> 'C:\\WINDOWS\\syst
> em32\\python26.zip', 'C:\\Python26\\DLLs', 'C:\\Python26\\lib',
> 'C:\\Python26\\l
> ib\\plat-win', 'C:\\Python26\\lib\\lib-tk', 'C:\\Python26',
> 'C:\\Python26\\lib\\
> site-packages', 'C:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
> 
> C:\>
> 
> On Windows cygwin:
> 
> $ echo $PYTHONPATH
> .:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
> 
> $ python -c "import sys ; print sys.path"
> ['',
> '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
> 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs',
> 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win',
> 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26',
> 'c:\\Python26\\lib\\site-packages',
> 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
> 
> $
> 
> What am I doing wrong ?
> 
> Thanks,
> Ron.
> 
> 
>  
> 


-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From davea at ieee.org  Tue Mar 16 11:03:44 2010
From: davea at ieee.org (Dave Angel)
Date: Tue, 16 Mar 2010 10:03:44 -0500
Subject: How to add a library path to pythonpath ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF684F3C883@enbmail01.lsi.com>
References: <mailman.62.1268737204.24845.python-list@python.org>	<7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>	<1fb1c371003160527q10add6bfk75c09b24bc486329@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C883@enbmail01.lsi.com>
Message-ID: <4B9F9DD0.2080306@ieee.org>



Barak, Ron wrote:
> Thanks for the suggestion Pable.
>
> However, I really need the $PYTHONPATH to include this additional library, so all Python scripts could use it.
>
> In Windows I have defined PYTHONPATH as c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\, and also in the Windows registry I have
>
> HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\version\PythonPath\ as C:\Python26\Lib;C:\Python26\DLLs;C:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\;C:\Python26\Lib\lib-tk;
>
> However, even with all the above, the SVMInspecor modules are not found.
>
>   
See my response at the end.  Top-posting makes for a very confusing thread.
> <snip>
>
> 2010/3/16 Barak, Ron <Ron.Barak at lsi.com<mailto:Ron.Barak at lsi.com>>
>
> Hi,
>
> I'm trying to add a library path to my pythonpath, but seems it is not accepted -
>
> On Windows DOS window:
>
> C:\>echo %PYTHONPATH%
> c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\
>
> C:\>python -c "import sys ; print sys.path"
> ['', 'c:\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib', 'C:\\WINDOWS\\syst
> em32\\python26.zip', 'C:\\Python26\\DLLs', 'C:\\Python26\\lib', 'C:\\Python26\\l
> ib\\plat-win', 'C:\\Python26\\lib\\lib-tk', 'C:\\Python26', 'C:\\Python26\\lib\\
> site-packages', 'C:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
>
> C:\>
>
> On Windows cygwin:
>
> $ echo $PYTHONPATH
> .:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
>
> $ python -c "import sys ; print sys.path"
> ['', '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib', 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs', 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win', 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26', 'c:\\Python26\\lib\\site-packages', 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
>
> $
>
> What am I doing wrong ?
>
> Thanks,
> Ron.
>
>
>   
In your original message, what you displayed worked exactly as 
expected.  As you didn't say what made you think something was wrong, I 
ignored the message.

Now, you say that some modules are not found.  So how about giving some 
more specifics so someone can actually debug the problem.  Pick a 
particular module, tell us the complete path to that module, and show us 
both the sys.path strings (which look correct for the Windows case, and 
of course bogus for the cygwin case), as well as the offending import 
statement and its traceback.

DaveA


From robert.kern at gmail.com  Tue Mar 16 11:06:10 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 16 Mar 2010 10:06:10 -0500
Subject: class inheritance
In-Reply-To: <4B9F7B2A.1080906@ieee.org>
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>	<9bb4c1e7-858e-4ee6-870b-5a6549b6c496@b36g2000pri.googlegroups.com>	<05d0d40f-3fa0-4095-875d-777b49122d12@l12g2000prg.googlegroups.com>	<7088c1e1-9a1f-42d8-aac2-5ba19806165a@o30g2000yqb.googlegroups.com>
	<4B9F7B2A.1080906@ieee.org>
Message-ID: <hno6p2$upb$1@dough.gmane.org>

On 2010-03-16 07:35 AM, Dave Angel wrote:
>
>
> Carl Banks wrote:
>> On Mar 15, 4:34 pm, JLundell <jlund... at pobox.com> wrote:
>>> It's also unfortunate that Python doesn't have an approximately-equal
>>> operator; it'd come in handy for floating-point applications while
>>> preserving hash. If only there were a ~=r ? operator I could
>>> overload. And ~ is unary, so no joy.
>>
>> One problem with it is that there's no way to make it universal;
>> different appiplications have different ideas of close. Conceivably
>> it could be usefully defined for a user type though..
>>
>> Bacause of this problem almost no languages have an almost equal
>> operator. I'm curious what languages do, of if there are any with a
>> trinary operator that also takes a threshold.
>>
>> Carl Banks
>>
> If I recall correctly, APL has a *fuzz* value, which is used in all(?)
> comparisons. But I do not recall anything about how it was defined. I do
> recall that you could change the threshold, and suspect it was relative
> to the operands. For symmetry, it would probably have to be relative to
> the average of the two values, or some such.

The problem is that frequently there is no system-wide fuzz value which is 
appropriate for all comparisons in a given program. You need to choose the right 
value for each comparison. Consequently, you might as well use a function 
instead of an operator and a global variable.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From no.email at nospam.invalid  Tue Mar 16 11:09:37 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Tue, 16 Mar 2010 08:09:37 -0700
Subject: Searching for most pythonic/least stupid way to do something
	simple
References: <d62c4091-e0f0-4195-9b0e-dd597f9d0131@u9g2000yqb.googlegroups.com>
Message-ID: <7xmxy87172.fsf@ruckus.brouhaha.com>

david jensen <dmj.ccc at gmail.com> writes:
> Obviously, i can just write the code again, in an else, switching
> indices 0 and 1. Or, I could just have a test at the beginning, switch
> them if they are in the order "big, small", and then switch them again
> at the end in a list comprehension. Both ideas seem terribly silly,
> and there must be an obvious way to do it that I'm not seeing.

Generally when faced with this kind of question, see if you can
use the built-in min and max functions:

    def getOutcomes():
        outcomes=[]
        smaller = min(myList[0], myList[1])
        bigger  = max(myList[0], myList[1])
        amountToShare=2*smaller
        remainder = bigger - smaller
        ...


From dmj.ccc at gmail.com  Tue Mar 16 11:21:41 2010
From: dmj.ccc at gmail.com (david jensen)
Date: Tue, 16 Mar 2010 08:21:41 -0700 (PDT)
Subject: Searching for most pythonic/least stupid way to do something 
	simple
References: <d62c4091-e0f0-4195-9b0e-dd597f9d0131@u9g2000yqb.googlegroups.com>
	<dad44252-fcff-4f4b-9182-e52c28332cc6@g10g2000yqh.googlegroups.com>
Message-ID: <05fe1942-231f-4674-a55a-77ebca451da6@g4g2000yqa.googlegroups.com>

Thank you both very much!

Yeah: it was a total brainfart on my part: nn's solution should have
been obvious.

As the general solution, i like your approach, Gerard, but I think
I'll stick to nn's, the one i should have written.

Again, thank you both!

dmj


From Ron.Barak at lsi.com  Tue Mar 16 11:25:16 2010
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Tue, 16 Mar 2010 15:25:16 +0000
Subject: How to add a library path to pythonpath ?
In-Reply-To: <4B9F9DD0.2080306@ieee.org>
References: <mailman.62.1268737204.24845.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>
	<1fb1c371003160527q10add6bfk75c09b24bc486329@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C883@enbmail01.lsi.com>
	<4B9F9DD0.2080306@ieee.org>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF684F3C894@enbmail01.lsi.com>



> -----Original Message-----
> From: Dave Angel [mailto:davea at ieee.org]
> Sent: Tuesday, March 16, 2010 5:04 PM
> To: Barak, Ron
> Cc: Pablo Recio Quijano; python-list at python.org
> Subject: RE: How to add a library path to pythonpath ?
>
>
>
> Barak, Ron wrote:
> > Thanks for the suggestion Pable.
> >
> > However, I really need the $PYTHONPATH to include this
> additional library, so all Python scripts could use it.
> >
> > In Windows I have defined PYTHONPATH as
> > c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\, and also in the
> > Windows registry I have
> >
> >
> HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\version\PythonPath\ as
> >
> C:\Python26\Lib;C:\Python26\DLLs;C:\views\cc_view\TS_svm_ts_tool\SVMIn
> > spector\lib\;C:\Python26\Lib\lib-tk;
> >
> > However, even with all the above, the SVMInspecor modules
> are not found.
> >
> >
> See my response at the end.  Top-posting makes for a very
> confusing thread.
> > <snip>
> >
> > 2010/3/16 Barak, Ron <Ron.Barak at lsi.com<mailto:Ron.Barak at lsi.com>>
> >
> > Hi,
> >
> > I'm trying to add a library path to my pythonpath, but
> seems it is not
> > accepted -
> >
> > On Windows DOS window:
> >
> > C:\>echo %PYTHONPATH%
> > c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\
> >
> > C:\>python -c "import sys ; print sys.path"
> > ['', 'c:\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
> > 'C:\\WINDOWS\\syst em32\\python26.zip', 'C:\\Python26\\DLLs',
> > 'C:\\Python26\\lib', 'C:\\Python26\\l ib\\plat-win',
> > 'C:\\Python26\\lib\\lib-tk', 'C:\\Python26', 'C:\\Python26\\lib\\
> > site-packages',
> > 'C:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
> >
> > C:\>
> >
> > On Windows cygwin:
> >
> > $ echo $PYTHONPATH
> > .:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
> >
> > $ python -c "import sys ; print sys.path"
> > ['',
> >
> '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
> > 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs',
> > 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win',
> > 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26',
> > 'c:\\Python26\\lib\\site-packages',
> > 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
> >
> > $
> >
> > What am I doing wrong ?
> >
> > Thanks,
> > Ron.
> >
> >
> >
> In your original message, what you displayed worked exactly
> as expected.  As you didn't say what made you think something
> was wrong, I ignored the message.
>
> Now, you say that some modules are not found.  So how about
> giving some more specifics so someone can actually debug the
> problem.  Pick a particular module, tell us the complete path
> to that module, and show us both the sys.path strings (which
> look correct for the Windows case, and of course bogus for
> the cygwin case), as well as the offending import statement
> and its traceback.
>
> DaveA

Hi Dave,

My Python is the Windows Python (I need this for wxPython):

$ ls -ls `which python`
1 lrwxrwxrwx 1 rbarak mkgroup-l-d 31 Mar  4 14:02 /usr/bin/python -> /cygdrive/c/Python26/python.exe

Here's a demo script:

#!/usr/bin/env python

import sys
print "\n",sys.path,"\n"

from ErrorManager.ErrorManager import ErrorManager

And it's run produces:

$ python -u  tmp.py

['c:\\views\\cc_view\\TS_svm_ts_tool\\svm_ts_tool', '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib', 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs', 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win', 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26', 'c:\\Python26\\lib\\site-packages', 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']

Traceback (most recent call last):
  File "tmp.py", line 6, in <module>
    from ErrorManager.ErrorManager import ErrorManager
ImportError: No module named ErrorManager.ErrorManager

$ ls -ls /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/ErrorManager/ErrorManager.py
4 -rwxr-xr-x 1 rbarak ???????? 1843 Sep 21 19:16 /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/ErrorManager/ErrorManager.py

$ grep ErrorManager  /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
ErrorManager/ErrorManager.py
class ErrorManager:

$ echo $PYTHONPATH
.:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/

Please let me know if the above is enough, or you'd like to see the results from a Windows' DOS window.

Thanks,
Ron.
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From sam.bancal at gmail.com  Tue Mar 16 11:40:29 2010
From: sam.bancal at gmail.com (samb)
Date: Tue, 16 Mar 2010 08:40:29 -0700 (PDT)
Subject: affectation in if statement
References: <c16d4cde-8739-4a67-8b0e-9d588a678ece@c16g2000yqd.googlegroups.com>
	<mailman.823.1268727047.23598.python-list@python.org>
	<5c361012-1f7b-487f-915b-0f564b238be3@e1g2000yqh.googlegroups.com>
	<mailman.825.1268729621.23598.python-list@python.org>
	<8680128a-70a8-4dae-869b-108203be781c@y17g2000yqd.googlegroups.com>
	<ce7d69e9-c62b-44ae-b12b-922bb27bf458@c16g2000yqd.googlegroups.com> 
	<mailman.827.1268736984.23598.python-list@python.org>
Message-ID: <0e235861-54bc-4e0f-bfa1-7472dae8cbc4@30g2000yqi.googlegroups.com>

On Mar 16, 11:56?am, Jean-Michel Pichavant <jeanmic... at sequans.com>
wrote:
> samb wrote:
> > Hi,
>
> > I've found a work around, inspired from Rob Williscroft :
>
> > class ReMatch(object):
> > ? ? """
> > ? ? ? ? Object to be called :
> > ? ? ? ? 1st time : do a regexp.match and return the answer (args:
> > regexp, line)
> > ? ? ? ? 2nd time : return the previous result (args: prev)
> > ? ? """
> > ? ? def __call__(self, regexp='', line='', prev=False):
> > ? ? ? ? if prev:
> > ? ? ? ? ? ? return self.prev_match
> > ? ? ? ? self.prev_match = re.match(regexp, line)
> > ? ? ? ? return self.prev_match
>
> > re_match = ReMatch()
>
> > if re_match(r'define\s+(\S+)\s*{$', line):
> > ? ? m = re_match(prev=True)
> > ? ? # do some logic with m
> > elif re_match(r'include\s+(\S+)$', line):
> > ? ? m = re_match(prev=True)
> > ? ? # do some logic with m
> > else
> > ? ? # do some logic
>
> > Hope this is efficient ... I guess yes.
>
> > Cheers,
> > Sam
>
> What do you mean by efficient ? If you're talking about speed, make sure
> you care about it before doing some optimization.
> If you talk about readability then it is absolutely *not* efficient (to
> my humble opinion).
>
> define, include = re.match(r'define\s+(\S+)\s*{$', line),
> re.match(r'include\s+(\S+)$', line)
> if define:
> ? ? # do some stuff
> elif include:
> ? ? # do some other stuff
> else:
> ? ? # hello world
>
> If you then have some speed problem with that script, you'll start
> caring about how to execute if faster by making sure that only necessary
> calls to re.match are done.
>
> match = re.match(r'(define)\s+(\S+)\s*{$', line) or
> re.match(r'(include)\s+(\S+)$', line) # note that the second operand is
> executed only if the first is None
>
> if match.group(1) == 'define':
> ? ? # do some stuff with match.group(2)
>
> elif match.group(1) == 'include':
> ? ? # do some other stuff with match.group(2)
>
> else:
> ? ? # hello world
>
> JM

Hi,

Thanks Bruno for the simpler API!
And thanks Jean-Michel, your second suggestion is clearly the best I
see.

I meant efficient mainly in the readable aspect (important for future
maintenance) and secondary for speed of execution. For sure I didn't
want to run a regexp twice.

Regards,
Sam


From lists at cheimes.de  Tue Mar 16 11:56:28 2010
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 16 Mar 2010 16:56:28 +0100
Subject: How to add a library path to pythonpath ?
In-Reply-To: <hno4na$o98$1@dough.gmane.org>
References: <mailman.62.1268737204.24845.python-list@python.org>	<7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>
	<hno4na$o98$1@dough.gmane.org>
Message-ID: <4B9FAA2C.3060806@cheimes.de>

Steve Holden schrieb:
> Barak, Ron wrote:
>> Hi,
>>
>> I'm trying to add a library path to my pythonpath, but seems it is not
>> accepted -
>>
>> On Windows DOS window:
>>
>> C:\>echo %PYTHONPATH%
>> c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\
>>  
> That looks like it should work. The only thing I notice is that I don't
> have a trailing backslash on my Windows PYTHONPATH. Could that be the
> problem?

Yes, that's definitely a major issue on Windows. Windows' stat() method
returns an error for paths with a trailing (back)slash. For example
_stat("C:\\Windows") works but _stat("C:\\Windows\\") sets errno to
ENOENT or ENOTDIR. I got bitten by the issue a couple of years ago as I
worked on pars of Python's import system.

Quoting Tim Peters: [1]

The Microsoft stat() function is extremely picky about
trailing (back)slashes.  For example, if you have a
directory c:/python, and pass "c:/python/" to the MS stat
(), it claims no such thing exists.  This isn't documented
by MS, but that's how it works:  a trailing (back)slash is
required if and only if the path passed in "is a root".  So
MS stat() doesn't understand "/python/", and doesn't
understand "d:" either.  The former doesn't tolerate a
(back)slash, while the latter requires one.


Christian

[1] http://mail.python.org/pipermail/python-bugs-list/2002-April/011099.html


From googler.1.webmaster at spamgourmet.com  Tue Mar 16 12:08:22 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Tue, 16 Mar 2010 09:08:22 -0700 (PDT)
Subject: C-API PyObject_Call
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
	<mailman.839.1268749506.23598.python-list@python.org>
Message-ID: <92d7720e-b8cc-4f41-8191-17c078911909@m37g2000yqf.googlegroups.com>

But the stack is empty after PyObject_Call, isnt it?


From phlip2005 at gmail.com  Tue Mar 16 12:12:08 2010
From: phlip2005 at gmail.com (Phlip)
Date: Tue, 16 Mar 2010 09:12:08 -0700 (PDT)
Subject: equivalent of Ruby's Pathname?
References: <843d5af9-e8db-4352-a853-4c99664eadf8@k6g2000prg.googlegroups.com>
	<22ac2bce-cf12-45e2-9d89-d7df56a2faa7@b1g2000prc.googlegroups.com> 
	<dcace5fc-5ae9-4756-942d-6da7da2f660d@s36g2000prh.googlegroups.com> 
	<91770e62-2fef-45c9-9e4d-e64088058af1@g8g2000pri.googlegroups.com> 
	<7tceiuF94hU1@mid.individual.net>
	<d871b429-deff-4974-84f3-d5f19c6b9042@u15g2000prd.googlegroups.com>
	<hn6na6$2ci$1@news.eternal-september.org>
	<aabee5b1-5c7d-4248-b096-99b5549c739a@o3g2000yqb.googlegroups.com>
	<mailman.563.1268241310.23598.python-list@python.org>
Message-ID: <7284f1df-100e-4fed-aed2-20b114040d64@v34g2000prm.googlegroups.com>

Chris Rebert wrote:

> The next closest thing would probably be the Python Cookbook:http://code.activestate.com/recipes/langs/python/

One thing I really like about ... my hacked version of path.py ... is
path.cd( lambda: ... ). It works great inside fabfile.py to
temporarily switch to a different folder:

sample_project = path('sample_project').abspath()

def run():
    sample_project.cd( lambda:
        _sh('python manage.py runserver 0.0.0.0:8000 --
settings=test_settings') )

After the lambda runs, we exception-safely return to the home folder.

(BTW I'm aware that a fabfile.py command with only one statement will
return to its shell and remain in the correct folder. It's just ...
the thought!)

This be .cd():

class path:

    def cd(self, block=None):
        previous = path(os.path.curdir).abspath()
        self.chdir()

        if block:
            try:      block()
            finally:  previous.chdir()

That's based on Jason Orendoff's work at http://www.jorendorff.com/articles/python/path

--
  Phlip
  http://c2.com/cgi/wiki?ZeekLand


From stefan_ml at behnel.de  Tue Mar 16 12:17:02 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 16 Mar 2010 17:17:02 +0100
Subject: C-API PyObject_Call
In-Reply-To: <92d7720e-b8cc-4f41-8191-17c078911909@m37g2000yqf.googlegroups.com>
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>	<mailman.839.1268749506.23598.python-list@python.org>
	<92d7720e-b8cc-4f41-8191-17c078911909@m37g2000yqf.googlegroups.com>
Message-ID: <hnoatv$lk6$1@dough.gmane.org>

moerchendiser2k3, 16.03.2010 17:08:
> But the stack is empty after PyObject_Call, isnt it?

I think Steve was expecting that you wanted to debug into your program, 
step into the call, and find the line yourself.

Stefan



From stefan_ml at behnel.de  Tue Mar 16 12:18:01 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 16 Mar 2010 17:18:01 +0100
Subject: C-API PyObject_Call
In-Reply-To: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
Message-ID: <hnoavp$lk6$2@dough.gmane.org>

moerchendiser2k3, 16.03.2010 12:52:
> i have a serious problem and I am looking for a solution. I pass an
> instance of a class from a file to PyObject_Call. When something
> fails, I get a full traceback. If it succeeds, I get the return value.
>
> Is it possible to get information from which line/file the return
> value of PyObject_Call is?

Could you explain what you want to do with this information and in what 
cases you need it? Do you want to extract the information programmatically 
at runtime?

Stefan



From python at hope.cz  Tue Mar 16 12:20:40 2010
From: python at hope.cz (Johny)
Date: Tue, 16 Mar 2010 09:20:40 -0700 (PDT)
Subject: Python bindings tutorial
Message-ID: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>

Is there any tutorial how to write a bindings for a exe ( dos)
program?
I would like to run it from a Python directly
( using import command and a particular function from the binding)
 not using os.system command.
Thanks
L.


From davea at ieee.org  Tue Mar 16 12:23:54 2010
From: davea at ieee.org (Dave Angel)
Date: Tue, 16 Mar 2010 11:23:54 -0500
Subject: How to add a library path to pythonpath ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF684F3C894@enbmail01.lsi.com>
References: <mailman.62.1268737204.24845.python-list@python.org>	<7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>	<1fb1c371003160527q10add6bfk75c09b24bc486329@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C883@enbmail01.lsi.com>
	<4B9F9DD0.2080306@ieee.org>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C894@enbmail01.lsi.com>
Message-ID: <4B9FB09A.7030609@ieee.org>

Barak, Ron wrote:
>   
>> -----Original Message-----
>> From: Dave Angel [mailto:davea at ieee.org]
>> Sent: Tuesday, March 16, 2010 5:04 PM
>> To: Barak, Ron
>> Cc: Pablo Recio Quijano; python-list at python.org
>> Subject: RE: How to add a library path to pythonpath ?
>>
>>
>>
>> Barak, Ron wrote:
>>     
>>> Thanks for the suggestion Pable.
>>>
>>> However, I really need the $PYTHONPATH to include this
>>>       
>> additional library, so all Python scripts could use it.
>>     
>>> In Windows I have defined PYTHONPATH as
>>> c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\, and also in the
>>> Windows registry I have
>>>
>>>
>>>       
>> HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\version\PythonPath\ as
>>     
>> C:\Python26\Lib;C:\Python26\DLLs;C:\views\cc_view\TS_svm_ts_tool\SVMIn
>>     
>>> spector\lib\;C:\Python26\Lib\lib-tk;
>>>
>>> However, even with all the above, the SVMInspecor modules
>>>       
>> are not found.
>>     
>>>       
>> See my response at the end.  Top-posting makes for a very
>> confusing thread.
>>     
>>> <snip>
>>>
>>> 2010/3/16 Barak, Ron <Ron.Barak at lsi.com<mailto:Ron.Barak at lsi.com>>
>>>
>>> Hi,
>>>
>>> I'm trying to add a library path to my pythonpath, but
>>>       
>> seems it is not
>>     
>>> accepted -
>>>
>>> On Windows DOS window:
>>>
>>> C:\>echo %PYTHONPATH%
>>> c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\
>>>
>>> C:\>python -c "import sys ; print sys.path"
>>> ['', 'c:\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
>>> 'C:\\WINDOWS\\syst em32\\python26.zip', 'C:\\Python26\\DLLs',
>>> 'C:\\Python26\\lib', 'C:\\Python26\\l ib\\plat-win',
>>> 'C:\\Python26\\lib\\lib-tk', 'C:\\Python26', 'C:\\Python26\\lib\\
>>> site-packages',
>>> 'C:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
>>>
>>> C:\>
>>>
>>> On Windows cygwin:
>>>
>>> $ echo $PYTHONPATH
>>> .:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
>>>
>>> $ python -c "import sys ; print sys.path"
>>> ['',
>>>
>>>       
>> '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
>>     
>>> 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs',
>>> 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win',
>>> 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26',
>>> 'c:\\Python26\\lib\\site-packages',
>>> 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
>>>
>>> $
>>>
>>> What am I doing wrong ?
>>>
>>> Thanks,
>>> Ron.
>>>
>>>
>>>
>>>       
>> In your original message, what you displayed worked exactly
>> as expected.  As you didn't say what made you think something
>> was wrong, I ignored the message.
>>
>> Now, you say that some modules are not found.  So how about
>> giving some more specifics so someone can actually debug the
>> problem.  Pick a particular module, tell us the complete path
>> to that module, and show us both the sys.path strings (which
>> look correct for the Windows case, and of course bogus for
>> the cygwin case), as well as the offending import statement
>> and its traceback.
>>
>> DaveA
>>     
>
> Hi Dave,
>
> My Python is the Windows Python (I need this for wxPython):
>
> $ ls -ls `which python`
> 1 lrwxrwxrwx 1 rbarak mkgroup-l-d 31 Mar  4 14:02 /usr/bin/python -> /cygdrive/c/Python26/python.exe
>
> Here's a demo script:
>
> #!/usr/bin/env python
>
> import sys
> print "\n",sys.path,"\n"
>
> from ErrorManager.ErrorManager import ErrorManager
>
> And it's run produces:
>
> $ python -u  tmp.py
>
> ['c:\\views\\cc_view\\TS_svm_ts_tool\\svm_ts_tool', '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib', 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs', 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win', 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26', 'c:\\Python26\\lib\\site-packages', 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
>
> Traceback (most recent call last):
>   File "tmp.py", line 6, in <module>
>     from ErrorManager.ErrorManager import ErrorManager
> ImportError: No module named ErrorManager.ErrorManager
>
> $ ls -ls /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/ErrorManager/ErrorManager.py
> 4 -rwxr-xr-x 1 rbarak ???????? 1843 Sep 21 19:16 /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/ErrorManager/ErrorManager.py
>
> $ grep ErrorManager  /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
> ErrorManager/ErrorManager.py
> class ErrorManager:
>
> $ echo $PYTHONPATH
> .:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
>
> Please let me know if the above is enough, or you'd like to see the results from a Windows' DOS window.
>
> Thanks,
> Ron.
>
>   
Well, I pointed out that your cygwin path is bogus, so of course it 
won't work.  One of those entries is

    '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib'

I use Linux, and I use Windows.  But cygwin's glomming together has 
never made sense;  some things are Unix-like, and others are 
Windows-like.  So anything you do in that environment is beyond me.

If I had to guess, though I'd say you wanted to drop those first two 
characters from your PYTHONPATH.  If you really wanted two directories 
there, you should be separating them with semicolon (Windows rules), 
rather than colon (Linux rules).  First thing I'd do to test my theories 
is to print something like:
     print sys.path[1]
     print os.listdir(sys.path[1])
Does Python even see the cygwin view of the world ?

You also don't show the location of the module you're trying to import.  
I'm guessing that it's at ...SVMInspector/lib/ErrorManager/ErrorManager.py
Do you have a file     ...SVMInspector/lib/ErrorManager/__init__.py     ?

I would seriously recommend against naming your package, your module, 
and your class all the same thing.  Makes debugging very hard.  At least 
make them have different case combinations.

DaveA



From s.selvamsiva at gmail.com  Tue Mar 16 12:31:25 2010
From: s.selvamsiva at gmail.com (S.Selvam)
Date: Tue, 16 Mar 2010 22:01:25 +0530
Subject: web sound recording with python
In-Reply-To: <4acee8d1$0$919$ba4acef3@news.orange.fr>
References: <7676a0f3-5126-4930-af07-0b3cb737dffc@m33g2000pri.googlegroups.com>
	<4acee8d1$0$919$ba4acef3@news.orange.fr>
Message-ID: <b423b9551003160931j13e75163k8bc8aef847f05c46@mail.gmail.com>

On Fri, Oct 9, 2009 at 1:10 PM, Michel Claveau - MVP
<enleverLesX_XXmcX at xmclavxeaux.com.invalid> wrote:

> Hi!
>
> On windows, you can record sound who play on the local sound-card.
> It is not really Python scripting, but Python can launch it.
>

Does python do not have support for voice recording ?


-- 
Regards,
S.Selvam

  " I am because we are "
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From dmj.ccc at gmail.com  Tue Mar 16 12:31:36 2010
From: dmj.ccc at gmail.com (david jensen)
Date: Tue, 16 Mar 2010 09:31:36 -0700 (PDT)
Subject: Searching for most pythonic/least stupid way to do something 
	simple
References: <d62c4091-e0f0-4195-9b0e-dd597f9d0131@u9g2000yqb.googlegroups.com>
	<7xmxy87172.fsf@ruckus.brouhaha.com>
Message-ID: <2c39f6d4-3118-43f3-907d-57f733dc7ed8@d27g2000yqf.googlegroups.com>

Thanks Paul, but i don't immediately see how that helps (maybe I'm
just being dense)... nn's solution, though i initially thought it
worked, actually has a similar problem:

intended:
>>> print getOutcomes([3,4,5,5])
[[6, 1, 5, 5], [4.5, 2.5, 5, 5], [3, 4, 5, 5], [1.5, 5.5, 5, 5], [0,
7, 5, 5]]
>>> print getOutcomes([4,3,5,5])
[[7, 0, 5, 5], [5.5, 1.5, 5, 5], [4, 3, 5, 5], [2.5, 4.5, 5, 5], [1,
6, 5, 5]]

nn's solution:
>>> print getOutcomesNN([4,3,5,5])
[[6.0, 1.0, 5, 5], [4.5, 2.5, 5, 5], [3.0, 4.0, 5, 5], [1.5, 5.5, 5,
5], [0.0, 7.0, 5, 5]]


it's obvious why this is happening (the list comprehension assumes
that index 0 is, after all, index 0), but not immediately obvious how
to fix it, except by going with gerard's solution or doing what i did
in the beginning: flip them if they're in the wrong order, remember,
and flip them again at the end.

dmj


From googler.1.webmaster at spamgourmet.com  Tue Mar 16 12:41:16 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Tue, 16 Mar 2010 09:41:16 -0700 (PDT)
Subject: C-API PyObject_Call
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
	<mailman.849.1268756405.23598.python-list@python.org>
Message-ID: <3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>

In one case I have to check the return value of PyObject_Call, and if
its not of the correct return value,
I throw an exception, but I just get a simple output:

TypeError: Expected an instance of XYZ, no int.

instead of

Traceback (most called...)
TypeError: in line 3, file test.py: expected an instance of XYZ, no
int...


From jackdied at gmail.com  Tue Mar 16 12:49:59 2010
From: jackdied at gmail.com (Jack Diederich)
Date: Tue, 16 Mar 2010 12:49:59 -0400
Subject: Dynamic Class Creation
In-Reply-To: <50697b2c1003152318t7b9cd692pcf11ca45bbe1f041@mail.gmail.com>
References: <b05e819c-a005-49d4-b0e7-78be9a56b268@q2g2000pre.googlegroups.com>
	<50697b2c1003152318t7b9cd692pcf11ca45bbe1f041@mail.gmail.com>
Message-ID: <b8e622741003160949s3c8e34dfr407a79908b6dbfd0@mail.gmail.com>

On Tue, Mar 16, 2010 at 2:18 AM, Chris Rebert <clp2 at rebertia.com> wrote:
> On Mon, Mar 15, 2010 at 11:01 PM, Josh English
> <joshua.r.english at gmail.com> wrote:
>> I have a large program with lots of data stored in XML. I'm upgrading
>> my GUI to use ObjectListView, but with my data in XML, I don't have
>> regular objects to interact with the OLV. I do have an XML validator
>> that defines the structure of the XML elements, and I'm trying to
>> dynamically create a class to wrap the XML element.
>>
>> So, an element like:
>>
>> <market code="WotF">
>> <title>Writers of the Future</title>
>> </market>
>>
>> I want to create a class like:
>>
>> class Market(object):
>> ? ?def __init__(self, elem):
>> ? ? ? ?self._elem = elem
>>
>> ? ?def get_code(self):
>> ? ? ? ?return self._elem.get('code')
>>
>> ? ?def set_code(self, value):
>> ? ? ? ?self._elem.set('code', value)
>>
>> ? ?def get_title(self):
>> ? ? ? ?return self._elem.find('title').text
>>
>> ? ?def set_title(self, value):
>> ? ? ? ?node = self._elem.find('title')
>> ? ? ? ?node.text = value
>>
>> Naturally, I don't want to hand code this for every interface but
>> would like to create them dynamically. (The laziness of programming, I
>> guess.)
>>
>> What's the best way to create these helper methods?

You can either define a catch-all __getattr__ method to look them up
dynamically, or as Chris kinda-suggested write descriptors for the
individual elements.

class Market():
  def __init__(self, elem):
    self._elem = elem
  def __getattr__(self, name):
    try:
      # I'm assuming this raises a KeyError when not found
      return self._elem.get(name)
    except KeyError:
      return self._elem.find(name)
  def __setitem__(self, name, value):
     # like __getitem__ but for setting

Chris' property maker function is almost like a descriptor class (how
properties are implemented under the hood), here's a refactoring
[untested]

class ElemGetProperty():
    def __init__(self, name):
      self.name = name
    def __get__(self, ob, cls):
      return ob._elem.get(self.name)
    def __set__(self, ob, val):
       ob._elem.set(self.name, val)

You could write one property class for each kind of element (get/find)
and then put them in your class like this

class Market():
    code = ElemGetProperty('code')
    title = ElemFindProeprty('title')

The getattr/setattr method is easier to understand and will handle
arbitrary elements;  for the descriptors version you'll have to define
one for each tag that might be used on the class.

-Jack


From clp2 at rebertia.com  Tue Mar 16 12:53:37 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 16 Mar 2010 09:53:37 -0700
Subject: Dynamic Class Creation
In-Reply-To: <b8e622741003160949s3c8e34dfr407a79908b6dbfd0@mail.gmail.com>
References: <b05e819c-a005-49d4-b0e7-78be9a56b268@q2g2000pre.googlegroups.com>
	<50697b2c1003152318t7b9cd692pcf11ca45bbe1f041@mail.gmail.com>
	<b8e622741003160949s3c8e34dfr407a79908b6dbfd0@mail.gmail.com>
Message-ID: <50697b2c1003160953l209c21ddm5b9c0d960a6f2@mail.gmail.com>

On Tue, Mar 16, 2010 at 9:49 AM, Jack Diederich <jackdied at gmail.com> wrote:
> On Tue, Mar 16, 2010 at 2:18 AM, Chris Rebert <clp2 at rebertia.com> wrote:
>> On Mon, Mar 15, 2010 at 11:01 PM, Josh English
>> <joshua.r.english at gmail.com> wrote:
<snip>
>>> What's the best way to create these helper methods?
>
> You can either define a catch-all __getattr__ method to look them up
> dynamically, or as Chris kinda-suggested write descriptors for the
> individual elements.
>
> class Market():
> ?def __init__(self, elem):
> ? ?self._elem = elem
> ?def __getattr__(self, name):
> ? ?try:
> ? ? ?# I'm assuming this raises a KeyError when not found
> ? ? ?return self._elem.get(name)
> ? ?except KeyError:
> ? ? ?return self._elem.find(name)
> ?def __setitem__(self, name, value):

did you mean __setattr__ here?

<snip>
> The getattr/setattr method is easier to understand and will handle
> arbitrary elements; ?for the descriptors version you'll have to define
> one for each tag that might be used on the class.

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


From dmj.ccc at gmail.com  Tue Mar 16 12:54:57 2010
From: dmj.ccc at gmail.com (david jensen)
Date: Tue, 16 Mar 2010 09:54:57 -0700 (PDT)
Subject: Searching for most pythonic/least stupid way to do something 
	simple
References: <d62c4091-e0f0-4195-9b0e-dd597f9d0131@u9g2000yqb.googlegroups.com>
	<7xmxy87172.fsf@ruckus.brouhaha.com>
	<2c39f6d4-3118-43f3-907d-57f733dc7ed8@d27g2000yqf.googlegroups.com>
Message-ID: <288bfc27-0c5b-4601-9ceb-dd2614593fb9@m37g2000yqf.googlegroups.com>

of course, changing nn's to:
def getOutcomes(myList=[2,5,8,3,5]):
   low_id = int(myList[0]>myList[1])
   amountToShare = 2*myList[low_id]
   remainder = myList[not low_id]-myList[low_id]
   tail=list(myList[2:])
   outcomes = [[amountToShare*perc, remainder+amountToShare*(1-perc)]+
tail for perc in (1.0, 0.75, 0.5, 0.25, 0.0)] if not low_id else
[[remainder+amountToShare*perc, amountToShare*(1-perc)]+ tail for perc
in (1.0, 0.75, 0.5, 0.25, 0.0)]
   return outcomes


works, just hides the ugliness in a more compact form


From martin.schmidt1 at gmail.com  Tue Mar 16 12:56:15 2010
From: martin.schmidt1 at gmail.com (Martin Schmidt)
Date: Tue, 16 Mar 2010 11:56:15 -0500
Subject: Python-list Digest, Vol 78, Issue 161
In-Reply-To: <mailman.3920.1268726105.23597.python-list@python.org>
References: <mailman.3920.1268726105.23597.python-list@python.org>
Message-ID: <5444f9711003160956l316a07dfs89f4f418e7528f20@mail.gmail.com>

Thanks, Stefan.
Actually I will have to run the searches I am interested in only a few times
and therefore will drop performance concerns.

Thanks for len(text.split()) .
I will try it later.

The text I am interested in is always in leaf elements.

I have posted a concrete example incl. a representative XML file a few
minutes ago.
I hope this clarifies my problem.

Rereading what I wrote sounds admittedly funnny.
What I meant that I did not find a post that closely matches my problem (I
know that the closeness needed in my case will seem excessive to more
experienced Python/XML users).

Best regards.

  Martin


P.S. Sorry for my late reply, but my Internet connection was down for a day.




> ---------- Forwarded message ----------
> From: Stefan Behnel <stefan_ml at behnel.de>
> To: python-list at python.org
> Date: Tue, 16 Mar 2010 08:50:30 +0100
> Subject: Re: extract occurrence of regular expression from elements of XML
> documents
> Martin Schmidt, 15.03.2010 18:16:
>
>> I have just started to use Python a few weeks ago and until last week I
>> had
>> no knowledge of XML.
>> Obviously my programming knowledge is pretty basic.
>> Now I would like to use Python in combination with ca. 2000 XML documents
>> (about 30 kb each) to search for certain regular expression within
>> specific
>> elements of these documents.
>>
>
> 2000 * 30K isn't a huge problem, that's just 60M in total. If you just have
> to do it once, drop your performance concerns and just get a solution going.
> If you have to do it once a day, take care to use a tool that is not too
> resource consuming. If you have strict requirements to do it once a minute,
> use a fast machine with a couple of cores and do it in parallel. If you have
> a huge request workload and want to reverse index the XML to do all sorts of
> sophisticated queries on it, use a database instead.
>
>
>  I would then like to record the number of occurrences of the regular
>> expression within these elements.
>> Moreover I would like to count the total number of words contained within
>> these,
>>
>
> len(text.split()) will give you those.
>
> BTW, is it document-style XML (with mixed content as in HTML) or is the
> text always withing a leaf element?
>
>
>  and record the attribute of a higher level element that contains
>> them.
>>
>
> An example would certainly help here.
>
>
>  I was trying to figure out the best way how to do this, but got
>> overwhelmed
>> by the available information (e.g. posts using different approaches based
>> on
>> dom, sax, xpath, elementtree, expat).
>> The outcome should be a file that lists the extracted attribute, the
>> number
>> of occurrences of the regular expression, and the total number of words.
>> I did not find a post that addresses my problem.
>>
>
> Funny that you say that after stating that you were overwhelmed by the
> available information.
>
>
>  If someone could help me with this I would really appreciate it.
>>
>
> Most likely, the solution with the best simplicity/performance trade-off
> would be xml.etree.cElementTree's iterparse(), intercept on each interesting
> tag name, and search its text/tail using the regexp. That's doable in a
> couple of lines.
>
> But unless you provide more information, it's hard to give better advice.
>
> Stefan
>
>
>
>
> ---------- Forwarded message ----------
> From: Chris Rebert <clp2 at rebertia.com>
> To: "Lawrence D'Oliveiro" <ldo at geek-central.gen.nz>
> Date: Tue, 16 Mar 2010 00:52:07 -0700
> Subject: Re: import antigravity
> On Tue, Mar 16, 2010 at 12:40 AM, Lawrence D'Oliveiro
> <ldo at geek-central.gen.new_zealand> wrote:
> > Subtle...
>
> You're a bit behind the times.
> If my calculations are right, that comic is over 2 years old.
>
> Cheers,
> Chris
>
>
>
> ---------- Forwarded message ----------
> From: Stefan Behnel <stefan_ml at behnel.de>
> To: python-list at python.org
> Date: Tue, 16 Mar 2010 08:51:58 +0100
> Subject: Re: import antigravity
> Lawrence D'Oliveiro, 16.03.2010 08:40:
>
>> Subtle...
>>
>
> Absolutely.
>
>  Python 2.4.6 (#2, Jan 21 2010, 23:45:25)
>  [GCC 4.4.1] on linux2
>  Type "help", "copyright", "credits" or "license" for more information.
>  >>> import antigravity
>  Traceback (most recent call last):
>    File "<stdin>", line 1, in ?
>  ImportError: No module named antigravity
>
>
> Stefan
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From steve at holdenweb.com  Tue Mar 16 12:56:21 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 16 Mar 2010 12:56:21 -0400
Subject: How to add a library path to pythonpath ?
In-Reply-To: <4B9FB09A.7030609@ieee.org>
References: <mailman.62.1268737204.24845.python-list@python.org>	<7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>	<1fb1c371003160527q10add6bfk75c09b24bc486329@mail.gmail.com>	<7F0503CD69378F49BE0DC30661C6CCF684F3C883@enbmail01.lsi.com>	<4B9F9DD0.2080306@ieee.org>	<7F0503CD69378F49BE0DC30661C6CCF684F3C894@enbmail01.lsi.com>
	<4B9FB09A.7030609@ieee.org>
Message-ID: <hnod7s$ur9$1@dough.gmane.org>

Dave Angel wrote:
> Barak, Ron wrote:
>>  
>>> -----Original Message-----
>>> From: Dave Angel [mailto:davea at ieee.org]
>>> Sent: Tuesday, March 16, 2010 5:04 PM
>>> To: Barak, Ron
>>> Cc: Pablo Recio Quijano; python-list at python.org
>>> Subject: RE: How to add a library path to pythonpath ?
>>>
>>>
>>>
>>> Barak, Ron wrote:
>>>    
>>>> Thanks for the suggestion Pable.
>>>>
>>>> However, I really need the $PYTHONPATH to include this
>>>>       
>>> additional library, so all Python scripts could use it.
>>>    
>>>> In Windows I have defined PYTHONPATH as
>>>> c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\, and also in the
>>>> Windows registry I have
>>>>
>>>>
>>>>       
>>> HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\version\PythonPath\ as
>>>    
>>> C:\Python26\Lib;C:\Python26\DLLs;C:\views\cc_view\TS_svm_ts_tool\SVMIn
>>>    
>>>> spector\lib\;C:\Python26\Lib\lib-tk;
>>>>
>>>> However, even with all the above, the SVMInspecor modules
>>>>       
>>> are not found.
>>>    
>>>>       
>>> See my response at the end.  Top-posting makes for a very
>>> confusing thread.
>>>    
>>>> <snip>
>>>>
>>>> 2010/3/16 Barak, Ron <Ron.Barak at lsi.com<mailto:Ron.Barak at lsi.com>>
>>>>
>>>> Hi,
>>>>
>>>> I'm trying to add a library path to my pythonpath, but
>>>>       
>>> seems it is not
>>>    
>>>> accepted -
>>>>
>>>> On Windows DOS window:
>>>>
>>>> C:\>echo %PYTHONPATH%
>>>> c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\
>>>>
>>>> C:\>python -c "import sys ; print sys.path"
>>>> ['', 'c:\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
>>>> 'C:\\WINDOWS\\syst em32\\python26.zip', 'C:\\Python26\\DLLs',
>>>> 'C:\\Python26\\lib', 'C:\\Python26\\l ib\\plat-win',
>>>> 'C:\\Python26\\lib\\lib-tk', 'C:\\Python26', 'C:\\Python26\\lib\\
>>>> site-packages',
>>>> 'C:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
>>>>
>>>> C:\>
>>>>
>>>> On Windows cygwin:
>>>>
>>>> $ echo $PYTHONPATH
>>>> .:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
>>>>
>>>> $ python -c "import sys ; print sys.path"
>>>> ['',
>>>>
>>>>       
>>> '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
>>>    
>>>> 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs',
>>>> 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win',
>>>> 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26',
>>>> 'c:\\Python26\\lib\\site-packages',
>>>> 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
>>>>
>>>> $
>>>>
>>>> What am I doing wrong ?
>>>>
>>>> Thanks,
>>>> Ron.
>>>>
>>>>
>>>>
>>>>       
>>> In your original message, what you displayed worked exactly
>>> as expected.  As you didn't say what made you think something
>>> was wrong, I ignored the message.
>>>
>>> Now, you say that some modules are not found.  So how about
>>> giving some more specifics so someone can actually debug the
>>> problem.  Pick a particular module, tell us the complete path
>>> to that module, and show us both the sys.path strings (which
>>> look correct for the Windows case, and of course bogus for
>>> the cygwin case), as well as the offending import statement
>>> and its traceback.
>>>
>>> DaveA
>>>     
>>
>> Hi Dave,
>>
>> My Python is the Windows Python (I need this for wxPython):
>>
>> $ ls -ls `which python`
>> 1 lrwxrwxrwx 1 rbarak mkgroup-l-d 31 Mar  4 14:02 /usr/bin/python ->
>> /cygdrive/c/Python26/python.exe
>>
>> Here's a demo script:
>>
>> #!/usr/bin/env python
>>
>> import sys
>> print "\n",sys.path,"\n"
>>
>> from ErrorManager.ErrorManager import ErrorManager
>>
>> And it's run produces:
>>
>> $ python -u  tmp.py
>>
>> ['c:\\views\\cc_view\\TS_svm_ts_tool\\svm_ts_tool',
>> '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
>> 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs',
>> 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win',
>> 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26',
>> 'c:\\Python26\\lib\\site-packages',
>> 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
>>
>> Traceback (most recent call last):
>>   File "tmp.py", line 6, in <module>
>>     from ErrorManager.ErrorManager import ErrorManager
>> ImportError: No module named ErrorManager.ErrorManager
>>
>> $ ls -ls
>> /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/ErrorManager/ErrorManager.py
>>
>> 4 -rwxr-xr-x 1 rbarak ???????? 1843 Sep 21 19:16
>> /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/ErrorManager/ErrorManager.py
>>
>>
>> $ grep ErrorManager 
>> /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
>> ErrorManager/ErrorManager.py
>> class ErrorManager:
>>
>> $ echo $PYTHONPATH
>> .:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
>>
>> Please let me know if the above is enough, or you'd like to see the
>> results from a Windows' DOS window.
>>
>> Thanks,
>> Ron.
>>
>>   
> Well, I pointed out that your cygwin path is bogus, so of course it
> won't work.  One of those entries is
> 
>    '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib'
> 
> I use Linux, and I use Windows.  But cygwin's glomming together has
> never made sense;  some things are Unix-like, and others are
> Windows-like.  So anything you do in that environment is beyond me.
> 
> If I had to guess, though I'd say you wanted to drop those first two
> characters from your PYTHONPATH.  If you really wanted two directories
> there, you should be separating them with semicolon (Windows rules),
> rather than colon (Linux rules).  First thing I'd do to test my theories
> is to print something like:
>     print sys.path[1]
>     print os.listdir(sys.path[1])
> Does Python even see the cygwin view of the world ?
> 
> You also don't show the location of the module you're trying to import. 
> I'm guessing that it's at ...SVMInspector/lib/ErrorManager/ErrorManager.py
> Do you have a file     ...SVMInspector/lib/ErrorManager/__init__.py     ?
> 
> I would seriously recommend against naming your package, your module,
> and your class all the same thing.  Makes debugging very hard.  At least
> make them have different case combinations.
> 
In point of fact the mistake that's happening here is running the
Windows Python under Cygwin and expecting it to make sense.

Just because you run the Windows Python interpreter under Windows
doesn't make it magically capable of understanding a Cygwin path
specification.

We have yet to hear why the Cygwin Python isn't acceptable (though one
reason might be the unavailability of 2.6).

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From martin.schmidt1 at gmail.com  Tue Mar 16 12:58:00 2010
From: martin.schmidt1 at gmail.com (Martin Schmidt)
Date: Tue, 16 Mar 2010 11:58:00 -0500
Subject: extract occurrence of regular expression from elements of XML 
	documents
Message-ID: <5444f9711003160958h6514141amcfa12fa4233c4c67@mail.gmail.com>

On Tue, Mar 16, 2010 at 11:56 AM, Martin Schmidt
<martin.schmidt1 at gmail.com>wrote:

> Thanks, Stefan.
> Actually I will have to run the searches I am interested in only a few
> times and therefore will drop performance concerns.
>
> Thanks for len(text.split()) .
> I will try it later.
>
> The text I am interested in is always in leaf elements.
>
> I have posted a concrete example incl. a representative XML file a few
> minutes ago.
> I hope this clarifies my problem.
>
> Rereading what I wrote sounds admittedly funnny.
> What I meant that I did not find a post that closely matches my problem (I
> know that the closeness needed in my case will seem excessive to more
> experienced Python/XML users).
>
> Best regards.
>
>   Martin
>
>
> P.S. Sorry for my late reply, but my Internet connection was down for a
> day.
>
>
>
>
>> ---------- Forwarded message ----------
>> From: Stefan Behnel <stefan_ml at behnel.de>
>> To: python-list at python.org
>> Date: Tue, 16 Mar 2010 08:50:30 +0100
>> Subject: Re: extract occurrence of regular expression from elements of XML
>> documents
>> Martin Schmidt, 15.03.2010 18:16:
>>
>>> I have just started to use Python a few weeks ago and until last week I
>>> had
>>> no knowledge of XML.
>>> Obviously my programming knowledge is pretty basic.
>>> Now I would like to use Python in combination with ca. 2000 XML documents
>>> (about 30 kb each) to search for certain regular expression within
>>> specific
>>> elements of these documents.
>>>
>>
>> 2000 * 30K isn't a huge problem, that's just 60M in total. If you just
>> have to do it once, drop your performance concerns and just get a solution
>> going. If you have to do it once a day, take care to use a tool that is not
>> too resource consuming. If you have strict requirements to do it once a
>> minute, use a fast machine with a couple of cores and do it in parallel. If
>> you have a huge request workload and want to reverse index the XML to do all
>> sorts of sophisticated queries on it, use a database instead.
>>
>>
>>  I would then like to record the number of occurrences of the regular
>>> expression within these elements.
>>> Moreover I would like to count the total number of words contained within
>>> these,
>>>
>>
>> len(text.split()) will give you those.
>>
>> BTW, is it document-style XML (with mixed content as in HTML) or is the
>> text always withing a leaf element?
>>
>>
>>  and record the attribute of a higher level element that contains
>>> them.
>>>
>>
>> An example would certainly help here.
>>
>>
>>  I was trying to figure out the best way how to do this, but got
>>> overwhelmed
>>> by the available information (e.g. posts using different approaches based
>>> on
>>> dom, sax, xpath, elementtree, expat).
>>> The outcome should be a file that lists the extracted attribute, the
>>> number
>>> of occurrences of the regular expression, and the total number of words.
>>> I did not find a post that addresses my problem.
>>>
>>
>> Funny that you say that after stating that you were overwhelmed by the
>> available information.
>>
>>
>>  If someone could help me with this I would really appreciate it.
>>>
>>
>> Most likely, the solution with the best simplicity/performance trade-off
>> would be xml.etree.cElementTree's iterparse(), intercept on each interesting
>> tag name, and search its text/tail using the regexp. That's doable in a
>> couple of lines.
>>
>> But unless you provide more information, it's hard to give better advice.
>>
>> Stefan
>>
>>
>>
>>
>> ---------- Forwarded message ----------
>> From: Chris Rebert <clp2 at rebertia.com>
>> To: "Lawrence D'Oliveiro" <ldo at geek-central.gen.nz>
>> Date: Tue, 16 Mar 2010 00:52:07 -0700
>> Subject: Re: import antigravity
>> On Tue, Mar 16, 2010 at 12:40 AM, Lawrence D'Oliveiro
>> <ldo at geek-central.gen.new_zealand> wrote:
>> > Subtle...
>>
>> You're a bit behind the times.
>> If my calculations are right, that comic is over 2 years old.
>>
>> Cheers,
>> Chris
>>
>>
>>
>> ---------- Forwarded message ----------
>> From: Stefan Behnel <stefan_ml at behnel.de>
>> To: python-list at python.org
>> Date: Tue, 16 Mar 2010 08:51:58 +0100
>> Subject: Re: import antigravity
>> Lawrence D'Oliveiro, 16.03.2010 08:40:
>>
>>> Subtle...
>>>
>>
>> Absolutely.
>>
>>  Python 2.4.6 (#2, Jan 21 2010, 23:45:25)
>>  [GCC 4.4.1] on linux2
>>  Type "help", "copyright", "credits" or "license" for more information.
>>  >>> import antigravity
>>  Traceback (most recent call last):
>>    File "<stdin>", line 1, in ?
>>  ImportError: No module named antigravity
>>
>>
>> Stefan
>>
>>
>>
>> --
>>
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
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From steve at holdenweb.com  Tue Mar 16 13:00:36 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 16 Mar 2010 13:00:36 -0400
Subject: equivalent of Ruby's Pathname?
In-Reply-To: <7284f1df-100e-4fed-aed2-20b114040d64@v34g2000prm.googlegroups.com>
References: <843d5af9-e8db-4352-a853-4c99664eadf8@k6g2000prg.googlegroups.com>	<22ac2bce-cf12-45e2-9d89-d7df56a2faa7@b1g2000prc.googlegroups.com>
	<dcace5fc-5ae9-4756-942d-6da7da2f660d@s36g2000prh.googlegroups.com>
	<91770e62-2fef-45c9-9e4d-e64088058af1@g8g2000pri.googlegroups.com>
	<7tceiuF94hU1@mid.individual.net>	<d871b429-deff-4974-84f3-d5f19c6b9042@u15g2000prd.googlegroups.com>	<hn6na6$2ci$1@news.eternal-september.org>	<aabee5b1-5c7d-4248-b096-99b5549c739a@o3g2000yqb.googlegroups.com>	<mailman.563.1268241310.23598.python-list@python.org>
	<7284f1df-100e-4fed-aed2-20b114040d64@v34g2000prm.googlegroups.com>
Message-ID: <hnodfq$ur9$2@dough.gmane.org>

Phlip wrote:
> Chris Rebert wrote:
> 
>> The next closest thing would probably be the Python Cookbook:http://code.activestate.com/recipes/langs/python/
> 
> One thing I really like about ... my hacked version of path.py ... is
> path.cd( lambda: ... ). It works great inside fabfile.py to
> temporarily switch to a different folder:
> 
> sample_project = path('sample_project').abspath()
> 
> def run():
>     sample_project.cd( lambda:
>         _sh('python manage.py runserver 0.0.0.0:8000 --
> settings=test_settings') )
> 
> After the lambda runs, we exception-safely return to the home folder.
> 
> (BTW I'm aware that a fabfile.py command with only one statement will
> return to its shell and remain in the correct folder. It's just ...
> the thought!)
> 
> This be .cd():
> 
> class path:
> 
>     def cd(self, block=None):
>         previous = path(os.path.curdir).abspath()
>         self.chdir()
> 
>         if block:
>             try:      block()
>             finally:  previous.chdir()
> 
> That's based on Jason Orendoff's work at http://www.jorendorff.com/articles/python/path
> 
Wouldn't this be better written as a context manager?

Be aware also that this won't work well in a multi-threaded environment
(assuming os.path.chdir is ultimately used to change directories)
because it effects the process's (globaL current directory.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From mail.to.daniel.platz at googlemail.com  Tue Mar 16 13:10:16 2010
From: mail.to.daniel.platz at googlemail.com (Daniel Platz)
Date: Tue, 16 Mar 2010 10:10:16 -0700 (PDT)
Subject: passing a socket to a subprocess in windows
Message-ID: <e776af95-e028-47a4-ba42-eda558660a30@e1g2000yqh.googlegroups.com>

Hello!

I have a problem with passing a socket to a subprocess in windows. It
works in Linux and for windows there is a workaround in the Python
doc. However, this workaround does not work. It was already noted by
other people and they Python issue tracker

http://bugs.python.org/issue5879
***************************************************************************************************************
the example from

http://docs.python.org/library/multiprocessing.html?highlight=multiprocessing#module-multiprocessing

named "
# Example where a pool of http servers share a single listening socket
#
"
does not work on windows.

Reason:

s = socket.fromfd(fd, family, type_, proto)

in line 156 of reduction.py

fails, because fromfd is not available on windows. Sad thing:
reduction.py was put into processing.py exactly to solve that problem
(i.e. reduction.py is provided as workaround for socket.fromfd not
available on windows, from the documentation:
if sys.platform == 'win32':
    import multiprocessing.reduction
    # make sockets pickable/inheritable


the solution within processing was:

try:
    fromfd = socket.fromfd
except AttributeError:
    def fromfd(fd, family, type, proto=0):
        s = socket._socket.socket()
        _processing.changeFd(s, fd, family, type, proto)
        return s

but: _multiprocessing has no longer a method changeFd.

Harald
***********************************************************************************************************************

Has someone information about this or can help me to solve the
problem.

Thanks in advance

Daniel


From steve at holdenweb.com  Tue Mar 16 13:14:04 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 16 Mar 2010 13:14:04 -0400
Subject: C-API PyObject_Call
In-Reply-To: <3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>	<mailman.849.1268756405.23598.python-list@python.org>
	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>
Message-ID: <hnoe93$3k8$1@dough.gmane.org>

moerchendiser2k3 wrote:
> In one case I have to check the return value of PyObject_Call, and if
> its not of the correct return value,
> I throw an exception, but I just get a simple output:
> 
> TypeError: Expected an instance of XYZ, no int.
> 
> instead of
> 
> Traceback (most called...)
> TypeError: in line 3, file test.py: expected an instance of XYZ, no
> int...

Could we perhaps see a little bit more of the code? Are you throwing the
exception from within your C code or from the Python calling environment
with a raise statement?

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From python at bdurham.com  Tue Mar 16 13:18:15 2010
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 16 Mar 2010 13:18:15 -0400
Subject: Converting Python CGI to WSGI scripts
Message-ID: <1268759895.28810.1365130739@webmail.messagingengine.com>

I have a few dozen simple Python CGI scripts.

Are there any advantages or disadvantages to rewriting these CGI
scripts as WSGI scripts?

Apologies if my terminology is not correct ... when I say WSGI
scripts I mean standalone scripts like the following simplified
(as an example) template:

import sys
def application(environ, start_response):
    output = 'Welcome to your mod_wsgi website! It
uses:\n\nPython %s' % sys.version
    response_headers = [
        ('Content-Length', str(len(output))),
        ('Content-Type', 'text/plain'),
    ]
    start_response('200 OK', response_headers)
    return [output]

When I say script I don't mean classic WSGI application in the
sense of a .serve_forever() loop coordinating a bunch of related
scripts - I mean individual, standalone scripts.

Hope this makes sense :)

Thank you,
Malcolm
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From gatoygata2 at gmail.com  Tue Mar 16 14:13:40 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Tue, 16 Mar 2010 11:13:40 -0700 (PDT)
Subject: Python bindings tutorial
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>
Message-ID: <168167cf-c153-4e2b-8bca-5b9ae7afd67d@t23g2000yqt.googlegroups.com>

On Mar 16, 5:20?pm, Johny <pyt... at hope.cz> wrote:
> Is there any tutorial how to write a bindings for a exe ( dos)
> program?
> I would like to run it from a Python directly
> ( using import command and a particular function from the binding)
> ?not using os.system command.
> Thanks
> L.

subprocess ?


From gatoygata2 at gmail.com  Tue Mar 16 14:14:50 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Tue, 16 Mar 2010 11:14:50 -0700 (PDT)
Subject: Python bindings tutorial
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>
Message-ID: <92fa9d1d-d5a3-46b5-947b-12a0f338ee7e@t41g2000yqt.googlegroups.com>

On Mar 16, 5:20?pm, Johny <pyt... at hope.cz> wrote:
> Is there any tutorial how to write a bindings for a exe ( dos)
> program?
> I would like to run it from a Python directly
> ( using import command and a particular function from the binding)
> ?not using os.system command.
> Thanks
> L.

subprocess ?


From googler.1.webmaster at spamgourmet.com  Tue Mar 16 14:25:25 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Tue, 16 Mar 2010 11:25:25 -0700 (PDT)
Subject: C-API PyObject_Call
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
	<mailman.849.1268756405.23598.python-list@python.org>
	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>
	<mailman.858.1268759662.23598.python-list@python.org>
Message-ID: <c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>

Hi, currently I am not at home, I will post some stuff when I am back.
Just the note: I throw an exception with the C API.

Looks like that


PyObject *result = PyObject_Call(my_isntance, "", NULL);
if(result==NULL)
{
    PyErr_Print(); //when this happens, the traceback is correct with
information about the file/line
    return;
}

if(!PyXYZ_Check(result))
{
    PyErr_SetString(PyExc_TypeError, "Wrong type, ....");
    PyErr_Print(); //missing information of the file/line.
    return;
}

Well, I expect, that there are no information about the line/file, so
I know something is missing, but what is missing?

Bye, moerchendiser2k3


From twistedphrame at gmail.com  Tue Mar 16 14:56:30 2010
From: twistedphrame at gmail.com (Jordan Apgar)
Date: Tue, 16 Mar 2010 11:56:30 -0700 (PDT)
Subject: datetime string conversion error
Message-ID: <8cebc349-33d5-4820-a944-2e6869408f0f@c34g2000pri.googlegroups.com>

Hey all,
I'm trying to convert a string to a date time object and all my fields
convert except for month which seems to default to january.

here's what I'm doing:
date = "2010-03-16 14:46:38.409137"
 olddate = datetime.strptime(date,"%Y-%m-%j %H:%M:%S.%f")

print date
print olddate

I get:
2010-03-16 14:46:38.409137
2010-01-16 14:46:38.409137

notice the 01 in the second date from what I could tell everything is
formatted correctly.

thanks for the help.
~Jordan


From tack at urandom.ca  Tue Mar 16 14:59:00 2010
From: tack at urandom.ca (Jason Tackaberry)
Date: Tue, 16 Mar 2010 14:59:00 -0400
Subject: to pass self or not to pass self
In-Reply-To: <4b9f4984$0$10229$426a74cc@news.free.fr>
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
Message-ID: <1268765940.6473.13.camel@arrakis>

On Tue, 2010-03-16 at 10:04 +0100, Bruno Desthuilliers wrote:
> Answer here:
> 
> http://wiki.python.org/moin/FromFunctionToMethod

I have a sense I used to know this once upon a time, but the question
came to my mind (possibly again) and I couldn't think of an answer:

Why not create the bound methods at instantiation time, rather than
using the descriptor protocol which has the overhead of creating a new
bound method each time the method attribute is accessed?

Cheers,
Jason.




From lists at cheimes.de  Tue Mar 16 15:07:32 2010
From: lists at cheimes.de (Christian Heimes)
Date: Tue, 16 Mar 2010 20:07:32 +0100
Subject: datetime string conversion error
In-Reply-To: <8cebc349-33d5-4820-a944-2e6869408f0f@c34g2000pri.googlegroups.com>
References: <8cebc349-33d5-4820-a944-2e6869408f0f@c34g2000pri.googlegroups.com>
Message-ID: <4B9FD6F4.3060503@cheimes.de>

Jordan Apgar wrote:
> Hey all,
> I'm trying to convert a string to a date time object and all my fields
> convert except for month which seems to default to january.
> 
> here's what I'm doing:
> date = "2010-03-16 14:46:38.409137"
>  olddate = datetime.strptime(date,"%Y-%m-%j %H:%M:%S.%f")
> 
> print date
> print olddate
> 
> I get:
> 2010-03-16 14:46:38.409137
> 2010-01-16 14:46:38.409137
> 
> notice the 01 in the second date from what I could tell everything is
> formatted correctly.


%j is documtend as "Day of the year as a decimal number [001,366].". Did
you mean %d instead?

Christian



From torriem at gmail.com  Tue Mar 16 15:07:38 2010
From: torriem at gmail.com (Michael Torrie)
Date: Tue, 16 Mar 2010 13:07:38 -0600
Subject: Searching for most pythonic/least stupid way to do something
	simple
In-Reply-To: <288bfc27-0c5b-4601-9ceb-dd2614593fb9@m37g2000yqf.googlegroups.com>
References: <d62c4091-e0f0-4195-9b0e-dd597f9d0131@u9g2000yqb.googlegroups.com>	<7xmxy87172.fsf@ruckus.brouhaha.com>	<2c39f6d4-3118-43f3-907d-57f733dc7ed8@d27g2000yqf.googlegroups.com>
	<288bfc27-0c5b-4601-9ceb-dd2614593fb9@m37g2000yqf.googlegroups.com>
Message-ID: <4B9FD6FA.2010607@gmail.com>

david jensen wrote:
> of course, changing nn's to:
> def getOutcomes(myList=[2,5,8,3,5]):
>    low_id = int(myList[0]>myList[1])
>    amountToShare = 2*myList[low_id]
>    remainder = myList[not low_id]-myList[low_id]
>    tail=list(myList[2:])
>    outcomes = [[amountToShare*perc, remainder+amountToShare*(1-perc)]+
> tail for perc in (1.0, 0.75, 0.5, 0.25, 0.0)] if not low_id else
> [[remainder+amountToShare*perc, amountToShare*(1-perc)]+ tail for perc
> in (1.0, 0.75, 0.5, 0.25, 0.0)]
>    return outcomes
> 
> 
> works, just hides the ugliness in a more compact form

If Gerard's code works, I would consider it far superior to your code
here.  Pythonic does not necessarily mean short and ugly, nor does it
mean that you have to always use list comprehensions.   Having a
readable algorithm that's easy to follow in the future is a far better
way than trying to use python's cool features to compact the code to as
small and unreadable section as possible.

I used to use list comprehension all the time, but I've found that often
an explicit for loop is a much better solution in terms of
maintainability.  Especially when you start seeing nested comprehensions
such as you have here.



From twistedphrame at gmail.com  Tue Mar 16 15:11:54 2010
From: twistedphrame at gmail.com (Jordan Apgar)
Date: Tue, 16 Mar 2010 12:11:54 -0700 (PDT)
Subject: datetime string conversion error
References: <8cebc349-33d5-4820-a944-2e6869408f0f@c34g2000pri.googlegroups.com>
	<mailman.861.1268766455.23598.python-list@python.org>
Message-ID: <b5e99137-e6de-4257-9248-dd8e9185098b@a18g2000yqc.googlegroups.com>

On Mar 16, 3:07?pm, Christian Heimes <li... at cheimes.de> wrote:
> Jordan Apgar wrote:
> > Hey all,
> > I'm trying to convert a string to a date time object and all my fields
> > convert except for month which seems to default to january.
>
> > here's what I'm doing:
> > date = "2010-03-16 14:46:38.409137"
> > ?olddate = datetime.strptime(date,"%Y-%m-%j %H:%M:%S.%f")
>
> > print date
> > print olddate
>
> > I get:
> > 2010-03-16 14:46:38.409137
> > 2010-01-16 14:46:38.409137
>
> > notice the 01 in the second date from what I could tell everything is
> > formatted correctly.
>
> %j is documtend as "Day of the year as a decimal number [001,366].". Did
> you mean %d instead?
>
> Christian

That fixed it, thank you



From gagsl-py2 at yahoo.com.ar  Tue Mar 16 15:12:21 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 16 Mar 2010 16:12:21 -0300
Subject: Python bindings tutorial
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>
Message-ID: <op.u9ocyv1qx6zn5v@lepton.softlabbsas.com.ar>

En Tue, 16 Mar 2010 13:20:40 -0300, Johny <python at hope.cz> escribi?:

> Is there any tutorial how to write a bindings for a exe ( dos)
> program?
> I would like to run it from a Python directly
> ( using import command and a particular function from the binding)
>  not using os.system command.

Do you mean that you want to execute a particular function in the .exe  
program?
That's not possible (ok, you *could* do that if you work hard enough, but  
that's not how things are usually done)

-- 
Gabriel Genellina



From zak.mc.kraken at libero.it  Tue Mar 16 15:17:43 2010
From: zak.mc.kraken at libero.it (Vito 'ZeD' De Tullio)
Date: Tue, 16 Mar 2010 20:17:43 +0100
Subject: subtraction is giving me a syntax error
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
	<mailman.800.1268675343.23598.python-list@python.org>
	<hnlt4p$4j1$1@reader1.panix.com>
	<4b9eb5bd$0$27822$c3e8da3@news.astraweb.com>
	<hnmduj$gnp$1@reader1.panix.com>
	<pan.2010.03.16.07.47.45@REMOVE.THIS.cybersource.com.au>
	<hno43a$lh8$1@reader1.panix.com>
Message-ID: <hnolgn$vg4$1@dough.gmane.org>

Grant Edwards wrote:

>> As for not being able to see the difference between a hyphen and an
>> EN- dash, or minus sign, or whatever it is, yes but they are very
>> similar looking glyphs in virtually ever modern font. It would take a
>> good eye to see the difference between (say) ??? ??? and -.
> 
> My point is that if it's an ASCII file,

source files aren't (necessary) ASCII files

-- 
By ZeD



From hansmu at xs4all.nl  Tue Mar 16 15:30:22 2010
From: hansmu at xs4all.nl (Hans Mulder)
Date: Tue, 16 Mar 2010 20:30:22 +0100
Subject: import antigravity
In-Reply-To: <k88477-giu.ln1@satorlaser.homedns.org>
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
	<k88477-giu.ln1@satorlaser.homedns.org>
Message-ID: <4b9fdc50$0$22943$e4fe514c@news.xs4all.nl>

Ulrich Eckhardt wrote:
> Chris Rebert wrote:
>> You're a bit behind the times.
>> If my calculations are right, that comic is over 2 years old.
> 
> import timetravel

I think you mean:

     from __future__ import timetravel


-- HansM


From martin.hellwig at dcuktec.org  Tue Mar 16 15:44:58 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Tue, 16 Mar 2010 19:44:58 +0000
Subject: import antigravity
In-Reply-To: <4b9fdc50$0$22943$e4fe514c@news.xs4all.nl>
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
	<k88477-giu.ln1@satorlaser.homedns.org>
	<4b9fdc50$0$22943$e4fe514c@news.xs4all.nl>
Message-ID: <hnon3k$hvh$1@news.eternal-september.org>

On 03/16/10 19:30, Hans Mulder wrote:
> Ulrich Eckhardt wrote:
>> Chris Rebert wrote:
>>> You're a bit behind the times.
>>> If my calculations are right, that comic is over 2 years old.
>>
>> import timetravel
>
> I think you mean:
>
> from __future__ import timetravel
>
>
> -- HansM

Well according to Marty it is:
from __back_to_the_future import DeLorean

-- 
mph


From python at mrabarnett.plus.com  Tue Mar 16 15:53:20 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 16 Mar 2010 19:53:20 +0000
Subject: datetime string conversion error
In-Reply-To: <8cebc349-33d5-4820-a944-2e6869408f0f@c34g2000pri.googlegroups.com>
References: <8cebc349-33d5-4820-a944-2e6869408f0f@c34g2000pri.googlegroups.com>
Message-ID: <4B9FE1B0.3040700@mrabarnett.plus.com>

Jordan Apgar wrote:
> Hey all,
> I'm trying to convert a string to a date time object and all my fields
> convert except for month which seems to default to january.
> 
> here's what I'm doing:
> date = "2010-03-16 14:46:38.409137"
>  olddate = datetime.strptime(date,"%Y-%m-%j %H:%M:%S.%f")
> 
> print date
> print olddate
> 
> I get:
> 2010-03-16 14:46:38.409137
> 2010-01-16 14:46:38.409137
> 
> notice the 01 in the second date from what I could tell everything is
> formatted correctly.
> 
The problem seems to be related to your use of "%j", which parses the
day of the year.

If I use "%d" instead, which parses the day of the month (I think that's
what you intended!), then the month comes out as 3 as expected.


From tjreedy at udel.edu  Tue Mar 16 16:04:22 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 16 Mar 2010 16:04:22 -0400
Subject: Understanding the CPython dict implementation
In-Reply-To: <4b9f6fab$0$27822$c3e8da3@news.astraweb.com>
References: <mailman.768.1268610003.23598.python-list@python.org>
	<4b9f6fab$0$27822$c3e8da3@news.astraweb.com>
Message-ID: <hnoo84$cub$1@dough.gmane.org>

On 3/16/2010 7:46 AM, Steven D'Aprano wrote:
> On Sun, 14 Mar 2010 19:39:46 -0400, Terry Reedy wrote:
>
>> I found this PyCon2010 presentation to be excellent: The Mighty
>> Dictionary, Branden Craig Rhodes, 30 min.

Sorry,
http://pycon.blip.tv/file/3332763/

which plays fine in FF3.6 on windows


>> http://pycon.blip.tv/file/3264041/

wrong file number

> Unfortunately, that clip seems to be unwatchable, at least for me. It
> crashed the Netscape plugin in Konqueror, and crashed Firefox.

The flash version does not work for me. This is true of about 1/3 of the 
Pycon 2010 videos that I have tried. The .ogv version of this and all 
others that I have tried (hit Download under Comments) plays fine within 
FF3.6 on my windows xp machine. Perhaps there is a linux-specific bug, 
if that is what you are running under.

Terry Jan Reedy




From tjreedy at udel.edu  Tue Mar 16 16:10:22 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Tue, 16 Mar 2010 16:10:22 -0400
Subject: Python bindings tutorial
In-Reply-To: <op.u9ocyv1qx6zn5v@lepton.softlabbsas.com.ar>
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>
	<op.u9ocyv1qx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <hnoojb$cub$2@dough.gmane.org>

On 3/16/2010 3:12 PM, Gabriel Genellina wrote:
> En Tue, 16 Mar 2010 13:20:40 -0300, Johny <python at hope.cz> escribi?:
>
>> Is there any tutorial how to write a bindings for a exe ( dos)
>> program?
>> I would like to run it from a Python directly
>> ( using import command and a particular function from the binding)
>> not using os.system command.
>
> Do you mean that you want to execute a particular function in the .exe
> program?
> That's not possible (ok, you *could* do that if you work hard enough,
> but that's not how things are usually done)

If running a function within the .exe *is* what you want, then you 
should compile to .dll instead of .exe and use swig or ctypes to do the 
binding.






From invalid at invalid.invalid  Tue Mar 16 16:12:29 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Tue, 16 Mar 2010 20:12:29 +0000 (UTC)
Subject: subtraction is giving me a syntax error
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
	<mailman.800.1268675343.23598.python-list@python.org>
	<hnlt4p$4j1$1@reader1.panix.com>
	<4b9eb5bd$0$27822$c3e8da3@news.astraweb.com>
	<hnmduj$gnp$1@reader1.panix.com>
	<pan.2010.03.16.07.47.45@REMOVE.THIS.cybersource.com.au>
	<hno43a$lh8$1@reader1.panix.com>
	<mailman.864.1268767076.23598.python-list@python.org>
Message-ID: <hnoond$gcg$1@reader1.panix.com>

On 2010-03-16, Vito 'ZeD' De Tullio <zak.mc.kraken at libero.it> wrote:
> Grant Edwards wrote:
>
>>> As for not being able to see the difference between a hyphen and an
>>> EN- dash, or minus sign, or whatever it is, yes but they are very
>>> similar looking glyphs in virtually ever modern font. It would take a
>>> good eye to see the difference between (say) ??? ??? and -.
>> 
>> My point is that if it's an ASCII file,
>
> source files aren't (necessary) ASCII files

OK, if it's a file with encoding <whatever>, then characters that
aren't part of <whatever> shouldn't be rendered according so some
other arbitrary character set.  Illegal characters should be flagged
and displayed in a manner that makes it obvious you have illegal
characters in in the file.

If the OP was using a source file with an encoding that isn't accepted
by Python, then he needs to pick a source file encoding that is
recognized by Python.

Using a source file encoding where there are semantically _different_
characters that render identically is just asking for pain...

-- 
Grant Edwards               grant.b.edwards        Yow! I guess you guys got
                                  at               BIG MUSCLES from doing too
                              gmail.com            much STUDYING!


From jgardner at jonathangardner.net  Tue Mar 16 16:15:13 2010
From: jgardner at jonathangardner.net (Jonathan Gardner)
Date: Tue, 16 Mar 2010 13:15:13 -0700
Subject: to pass self or not to pass self
In-Reply-To: <4b9f4984$0$10229$426a74cc@news.free.fr>
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
Message-ID: <6cc20cea1003161315i377bc9c2l525964b1cb6550e7@mail.gmail.com>

On Tue, Mar 16, 2010 at 2:04 AM, Bruno Desthuilliers
<bruno.42.desthuilliers at websiteburo.invalid> wrote:
> lallous a ?crit :
>>
>> What is the difference between the reference in 'F' and 'func_tbl' ?
>
> Answer here:
>
> http://wiki.python.org/moin/FromFunctionToMethod
>

Among all the things in the Python language proper, this is probably
the most confusing thing for new programmers. Heck, even experienced
programmers get tangled up because they project how they think things
should work on to the Python model.

The second most confusing thing is probably how objects get instantiated.

-- 
Jonathan Gardner
jgardner at jonathangardner.net


From pavlovevidence at gmail.com  Tue Mar 16 16:16:50 2010
From: pavlovevidence at gmail.com (Carl Banks)
Date: Tue, 16 Mar 2010 13:16:50 -0700 (PDT)
Subject: C-API PyObject_Call
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
	<mailman.849.1268756405.23598.python-list@python.org>
	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>
	<mailman.858.1268759662.23598.python-list@python.org>
	<c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>
Message-ID: <afa22b98-e955-4559-a077-982cf55a3cab@q16g2000yqq.googlegroups.com>

On Mar 16, 11:25?am, moerchendiser2k3 <googler.
1.webmas... at spamgourmet.com> wrote:
> Hi, currently I am not at home, I will post some stuff when I am back.
> Just the note: I throw an exception with the C API.
>
> Looks like that
>
> PyObject *result = PyObject_Call(my_isntance, "", NULL);
> if(result==NULL)
> {
> ? ? PyErr_Print(); //when this happens, the traceback is correct with
> information about the file/line
> ? ? return;
>
> }
>
> if(!PyXYZ_Check(result))
> {
> ? ? PyErr_SetString(PyExc_TypeError, "Wrong type, ....");
> ? ? PyErr_Print(); //missing information of the file/line.
> ? ? return;
> }
>
> Well, I expect, that there are no information about the line/file, so
> I know something is missing, but what is missing?

Python tracebacks only contain line/file information about Python
files, not C files.  Here you raise an exception with a C statement,
and catch and print it in the very next line.  The exception doesn't
exit from Python code so there are no lines to print.

What line/file data you do expect to see?

If you want to see C line/file informnation you have to use a debugger
like gdb, as Steve Holden said.


Carl Banks


From dmj.ccc at gmail.com  Tue Mar 16 16:27:19 2010
From: dmj.ccc at gmail.com (david jensen)
Date: Tue, 16 Mar 2010 13:27:19 -0700 (PDT)
Subject: Searching for most pythonic/least stupid way to do something 
	simple
References: <d62c4091-e0f0-4195-9b0e-dd597f9d0131@u9g2000yqb.googlegroups.com>
	<7xmxy87172.fsf@ruckus.brouhaha.com>
	<2c39f6d4-3118-43f3-907d-57f733dc7ed8@d27g2000yqf.googlegroups.com>
	<288bfc27-0c5b-4601-9ceb-dd2614593fb9@m37g2000yqf.googlegroups.com> 
	<mailman.862.1268766468.23598.python-list@python.org>
Message-ID: <03631aaf-0cf2-4c15-9e0d-7ac0f33ae01d@c16g2000yqd.googlegroups.com>

>If Gerard's code works, I would consider it far superior to your code
>here.  Pythonic does not necessarily mean short and ugly

yes, I agree... and in my script i'm using something very like
Gerard's (thanks again, Gerard). I just posted the corrected version
of nn's because the original solved only half the problem.

thanks, all

dmj


From aahz at pythoncraft.com  Tue Mar 16 16:37:57 2010
From: aahz at pythoncraft.com (Aahz)
Date: 16 Mar 2010 13:37:57 -0700
Subject: The first ASIC designed with MyHDL
References: <4b9f7414$0$2887$ba620e4c@news.skynet.be>
Message-ID: <hnoq75$gsi$1@panix5.panix.com>

In article <4b9f7414$0$2887$ba620e4c at news.skynet.be>,
Jan Decaluwe  <jan at jandecaluwe.com> wrote:
>
>I am proud to report on the first ASIC product designed with MyHDL
>(afaik).
>
>http://www.jandecaluwe.com/hdldesign/digmac.html

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

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From benjamin.kaplan at case.edu  Tue Mar 16 16:42:05 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Tue, 16 Mar 2010 16:42:05 -0400
Subject: subtraction is giving me a syntax error
In-Reply-To: <hnoond$gcg$1@reader1.panix.com>
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
	<mailman.800.1268675343.23598.python-list@python.org>
	<hnlt4p$4j1$1@reader1.panix.com>
	<4b9eb5bd$0$27822$c3e8da3@news.astraweb.com>
	<hnmduj$gnp$1@reader1.panix.com>
	<pan.2010.03.16.07.47.45@REMOVE.THIS.cybersource.com.au>
	<hno43a$lh8$1@reader1.panix.com>
	<mailman.864.1268767076.23598.python-list@python.org>
	<hnoond$gcg$1@reader1.panix.com>
Message-ID: <ec96e1391003161342g6e21255bif1b29f4a31c15100@mail.gmail.com>

On Tue, Mar 16, 2010 at 4:12 PM, Grant Edwards <invalid at invalid.invalid>wrote:

> On 2010-03-16, Vito 'ZeD' De Tullio <zak.mc.kraken at libero.it> wrote:
> > Grant Edwards wrote:
> >
> >>> As for not being able to see the difference between a hyphen and an
> >>> EN- dash, or minus sign, or whatever it is, yes but they are very
> >>> similar looking glyphs in virtually ever modern font. It would take a
> >>> good eye to see the difference between (say) ??? ??? and -.
> >>
> >> My point is that if it's an ASCII file,
> >
> > source files aren't (necessary) ASCII files
>
> OK, if it's a file with encoding <whatever>, then characters that
> aren't part of <whatever> shouldn't be rendered according so some
> other arbitrary character set.  Illegal characters should be flagged
> and displayed in a manner that makes it obvious you have illegal
> characters in in the file.
>
> If the OP was using a source file with an encoding that isn't accepted
> by Python, then he needs to pick a source file encoding that is
> recognized by Python.
>
> Using a source file encoding where there are semantically _different_
> characters that render identically is just asking for pain...
>
>
>>> print u'\N{HYPHEN-MINUS}'
-
>>> print u'\N{MINUS SIGN}'
?
>>> print u'\N{SMALL HYPHEN-MINUS}'
?
>>> print u'\N{FIGURE DASH}'
?
>>> print u'\N{EN DASH}'
?
>>> print u'\N{SMALL EM DASH}'
?
>>> print u'\N{EM DASH}'
?
>>> print u'\N{HORIZONTAL BAR}'
?


Good luck finding a character encoding where you can see the difference
between each of those in context. Do you program in a hex editor?


> --
> Grant Edwards               grant.b.edwards        Yow! I guess you guys
> got
>                                  at               BIG MUSCLES from doing
> too
>                              gmail.com            much STUDYING!
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From breamoreboy at yahoo.co.uk  Tue Mar 16 16:44:09 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Tue, 16 Mar 2010 20:44:09 +0000
Subject: import antigravity
In-Reply-To: <4b9fdc50$0$22943$e4fe514c@news.xs4all.nl>
References: <hnnclk$eud$1@lust.ihug.co.nz>	<mailman.820.1268725930.23598.python-list@python.org>	<k88477-giu.ln1@satorlaser.homedns.org>
	<4b9fdc50$0$22943$e4fe514c@news.xs4all.nl>
Message-ID: <hnoqiq$md7$1@dough.gmane.org>

Hans Mulder wrote:
> Ulrich Eckhardt wrote:
>> Chris Rebert wrote:
>>> You're a bit behind the times.
>>> If my calculations are right, that comic is over 2 years old.
>>
>> import timetravel
> 
> I think you mean:
> 
>     from __future__ import timetravel
> 
> 
> -- HansM

Taking 1984 into account surely it should be

from __past__ import __future__ as future

But the question is, have we yet got to 1984, are we currently there or 
have we already gone past it?  Who actually *IS* running the time 
machine?  Are there any bugs??

Regards.

Mark Lawrence.



From gagsl-py2 at yahoo.com.ar  Tue Mar 16 18:39:04 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 16 Mar 2010 19:39:04 -0300
Subject: passing a socket to a subprocess in windows
References: <e776af95-e028-47a4-ba42-eda558660a30@e1g2000yqh.googlegroups.com>
Message-ID: <op.u9omjembx6zn5v@lepton.softlabbsas.com.ar>

En Tue, 16 Mar 2010 14:10:16 -0300, Daniel Platz  
<mail.to.daniel.platz at googlemail.com> escribi?:

> I have a problem with passing a socket to a subprocess in windows. It
> works in Linux and for windows there is a workaround in the Python
> doc. However, this workaround does not work. It was already noted by
> other people and they Python issue tracker
>
> http://bugs.python.org/issue5879

Unfortunately I cannot test it at this moment, but around line 360 in  
socketmodule.c:

#if defined(MS_WINDOWS) || defined(__BEOS__)
  ...
#define NO_DUP /* Actually it exists on NT 3.5, but what the heck... */
#endif

you could try removing that #define NO_DUP and recompiling. socket.fromfd  
should appear, and hopefully socket objects can now be sent thru the  
multiprocessing connection.

(I cannot see how the example could have actually worked on Windows, maybe  
I'm missing something. Perhaps http://bugs.python.org/issue3125 broke  
this.)

-- 
Gabriel Genellina



From jlundell at pobox.com  Tue Mar 16 18:55:17 2010
From: jlundell at pobox.com (JLundell)
Date: Tue, 16 Mar 2010 15:55:17 -0700 (PDT)
Subject: class inheritance
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
	<9bb4c1e7-858e-4ee6-870b-5a6549b6c496@b36g2000pri.googlegroups.com> 
	<05d0d40f-3fa0-4095-875d-777b49122d12@l12g2000prg.googlegroups.com> 
	<7088c1e1-9a1f-42d8-aac2-5ba19806165a@o30g2000yqb.googlegroups.com> 
	<4B9F7B2A.1080906@ieee.org>
	<mailman.845.1268752020.23598.python-list@python.org>
Message-ID: <f4838d80-3c2d-4249-bf08-35c6f34f166e@w9g2000prb.googlegroups.com>

On Mar 16, 8:06?am, Robert Kern <robert.k... at gmail.com> wrote:
> On 2010-03-16 07:35 AM, Dave Angel wrote:
>
>
>
>
>
>
>
> > Carl Banks wrote:
> >> On Mar 15, 4:34 pm, JLundell <jlund... at pobox.com> wrote:
> >>> It's also unfortunate that Python doesn't have an approximately-equal
> >>> operator; it'd come in handy for floating-point applications while
> >>> preserving hash. If only there were a ~=r ? operator I could
> >>> overload. And ~ is unary, so no joy.
>
> >> One problem with it is that there's no way to make it universal;
> >> different appiplications have different ideas of close. Conceivably
> >> it could be usefully defined for a user type though..
>
> >> Bacause of this problem almost no languages have an almost equal
> >> operator. I'm curious what languages do, of if there are any with a
> >> trinary operator that also takes a threshold.
>
> >> Carl Banks
>
> > If I recall correctly, APL has a *fuzz* value, which is used in all(?)
> > comparisons. But I do not recall anything about how it was defined. I do
> > recall that you could change the threshold, and suspect it was relative
> > to the operands. For symmetry, it would probably have to be relative to
> > the average of the two values, or some such.
>
> The problem is that frequently there is no system-wide fuzz value which is
> appropriate for all comparisons in a given program. You need to choose the right
> value for each comparison. Consequently, you might as well use a function
> instead of an operator and a global variable.
>
> --
> Robert Kern
>

APL scaled their fuzz to the larger of the values being compared. In
my case, my domain permits me to use a constant fuzz; all my units are
the same (votes, as it happens). I've seen abs(a/b-1) used instead of
abs(a-b); obviously you'd need to treat comparison with zero
specially.

But yeah, it's really a domain-specific problem.


From joshua.r.english at gmail.com  Tue Mar 16 19:31:11 2010
From: joshua.r.english at gmail.com (Josh English)
Date: Tue, 16 Mar 2010 16:31:11 -0700 (PDT)
Subject: datetime string conversion error
References: <8cebc349-33d5-4820-a944-2e6869408f0f@c34g2000pri.googlegroups.com>
Message-ID: <f1829de4-43d9-4e14-b9ea-9ee170358641@k24g2000pro.googlegroups.com>

On Mar 16, 11:56?am, Jordan Apgar <twistedphr... at gmail.com> wrote:

> here's what I'm doing:
> date = "2010-03-16 14:46:38.409137"
> ?olddate = datetime.strptime(date,"%Y-%m-%j %H:%M:%S.%f")
>

Due to circumstances, I'm using Python 2.5.4 on one machine (2.6 on
the other).

When I have a script as simple as this:

import datetime

datetime.datetime.strptime('2010-09-14', "%Y-%m-%d")


Running this script brings up a calendar, believe it or not. The
calendar displays March 2010, and shows the 22nd as a holiday. When I
dismiss the dialog box I get:
Traceback (most recent call last):
  File "strptimetest.py", line 3, in <module>
    datetime.datetime.strptime('2010-09-14', "%Y-%m-%d")
  File "C:\Python25\lib\_strptime.py", line 272, in <module>
    _TimeRE_cache = TimeRE()
  File "C:\Python25\lib\_strptime.py", line 191, in __init__
    self.locale_time = LocaleTime()
  File "C:\Python25\lib\_strptime.py", line 74, in __init__
    self.__calc_weekday()
  File "C:\Python25\lib\_strptime.py", line 94, in __calc_weekday
    a_weekday = [calendar.day_abbr[i].lower() for i in range(7)]
AttributeError: 'module' object has no attribute 'day_abbr'


err... what? Is this an old weirdness I don't remember from the 2.5
series?

I can select dates in the calendar, but nothing dismisses it but the
close box.

Josh English
Incredibly Confused


From robert.kern at gmail.com  Tue Mar 16 19:32:04 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 16 Mar 2010 18:32:04 -0500
Subject: class inheritance
In-Reply-To: <f4838d80-3c2d-4249-bf08-35c6f34f166e@w9g2000prb.googlegroups.com>
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>	<9bb4c1e7-858e-4ee6-870b-5a6549b6c496@b36g2000pri.googlegroups.com>
	<05d0d40f-3fa0-4095-875d-777b49122d12@l12g2000prg.googlegroups.com>
	<7088c1e1-9a1f-42d8-aac2-5ba19806165a@o30g2000yqb.googlegroups.com>
	<4B9F7B2A.1080906@ieee.org>	<mailman.845.1268752020.23598.python-list@python.org>
	<f4838d80-3c2d-4249-bf08-35c6f34f166e@w9g2000prb.googlegroups.com>
Message-ID: <hnp4dm$pj0$1@dough.gmane.org>

On 2010-03-16 17:55 PM, JLundell wrote:
> On Mar 16, 8:06 am, Robert Kern<robert.k... at gmail.com>  wrote:
>> On 2010-03-16 07:35 AM, Dave Angel wrote:
>>
>>> Carl Banks wrote:
>>>> On Mar 15, 4:34 pm, JLundell<jlund... at pobox.com>  wrote:
>>>>> It's also unfortunate that Python doesn't have an approximately-equal
>>>>> operator; it'd come in handy for floating-point applications while
>>>>> preserving hash. If only there were a ~=r ? operator I could
>>>>> overload. And ~ is unary, so no joy.
>>
>>>> One problem with it is that there's no way to make it universal;
>>>> different appiplications have different ideas of close. Conceivably
>>>> it could be usefully defined for a user type though..
>>
>>>> Bacause of this problem almost no languages have an almost equal
>>>> operator. I'm curious what languages do, of if there are any with a
>>>> trinary operator that also takes a threshold.
>>
>>>> Carl Banks
>>
>>> If I recall correctly, APL has a *fuzz* value, which is used in all(?)
>>> comparisons. But I do not recall anything about how it was defined. I do
>>> recall that you could change the threshold, and suspect it was relative
>>> to the operands. For symmetry, it would probably have to be relative to
>>> the average of the two values, or some such.
>>
>> The problem is that frequently there is no system-wide fuzz value which is
>> appropriate for all comparisons in a given program. You need to choose the right
>> value for each comparison. Consequently, you might as well use a function
>> instead of an operator and a global variable.
>>
>> --
>> Robert Kern
>>
>
> APL scaled their fuzz to the larger of the values being compared.

I know. My statement stands for relative fuzz values as well as it does for 
absolute fuzz values. :-)

> In
> my case, my domain permits me to use a constant fuzz; all my units are
> the same (votes, as it happens). I've seen abs(a/b-1) used instead of
> abs(a-b); obviously you'd need to treat comparison with zero
> specially.

One usually uses a combination of relative and absolute tolerances to account 
for the case when the values are close to zero.

> But yeah, it's really a domain-specific problem.

Right. And a single program might need to deal with multiple domains, so a 
single global setting to control a language feature is pretty fragile.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From greg.ewing at canterbury.ac.nz  Tue Mar 16 19:32:40 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Wed, 17 Mar 2010 12:32:40 +1300
Subject: Function that knows its argument's variable name
In-Reply-To: <47e725b6-1470-4563-a64b-02630032ef36@g26g2000yqn.googlegroups.com>
References: <47e725b6-1470-4563-a64b-02630032ef36@g26g2000yqn.googlegroups.com>
Message-ID: <80ai5hFh3uU1@mid.individual.net>

Helge Stenstr?m wrote:

> I want to write  function that prints a value of a variable, for
> debugging. Like:
> 
> myVariable = "parrot"
> otherVariable = "dead"
 >
> probe(myVariable)
> probe(otherVariable)

Not exactly, but you can come close with a little hackery.

import sys

def print_var(name):
   print name, "=", sys._getframe(1).f_locals[name]

def f():
   fred = 42
   mary = "christmas"
   print_var("fred")
   print_var("mary")

f()

-- 
Greg


From phlip2005 at gmail.com  Tue Mar 16 19:40:46 2010
From: phlip2005 at gmail.com (Phlip)
Date: Tue, 16 Mar 2010 16:40:46 -0700 (PDT)
Subject: Function that knows its argument's variable name
References: <47e725b6-1470-4563-a64b-02630032ef36@g26g2000yqn.googlegroups.com>
	<mailman.735.1268585160.23598.python-list@python.org>
Message-ID: <460a8b90-ee92-458c-b09e-abf230d7cdbc@q23g2000yqd.googlegroups.com>

> Yet, the answer to your question is not quite absolutely "no". ?Python
> has lots of introspection capabilities, including, perhaps, getting at
> and parsing the original code to find the call. ? ?But there's nothing
> direct for what you want.
>
> Gary Herron

Below my sig is one shot at it; which requires a lambda: for other
reasons. It's an assertion used with Django models.

You can search for the name of your trace method, instead of lambda,
using this brute-force technique.

And here's a nice thread on Greg's technique, from a very short time
ago:

  http://groups.google.com/group/comp.lang.python/msg/03dd85ce009044e9

--
  Phlip
  http://penbird.tumblr.com/

    def assert_model_changes(self, mod, item, frum, too, lamb):
        source = open(lamb.func_code.co_filename, 'r').readlines()
[lamb.func_code.co_firstlineno - 1]
        source = source.replace('lambda:', '').strip()
        model  = str(mod.__class__).replace("'>", '').split('.')[-1]

        should = '%s.%s should equal `%s` before your activation line,
`%s`' % \
                  (model, item, frum, source)

        self.assertEqual(frum, mod.__dict__[item], should)
        lamb()
        mod = mod.__class__.objects.get(pk=mod.pk)

        should = '%s.%s should equal `%s` after your activation line, `
%s`' % \
                  (model, item, too, source)

        self.assertEqual(too, mod.__dict__[item], should)
        return mod


From aahz at pythoncraft.com  Tue Mar 16 19:47:41 2010
From: aahz at pythoncraft.com (Aahz)
Date: 16 Mar 2010 16:47:41 -0700
Subject: highlight words by regex in pdf files using python
References: <af0830ae-1d24-4db9-b721-d6602fedd540@15g2000yqi.googlegroups.com>
Message-ID: <hnp5at$eig$1@panix5.panix.com>

In article <af0830ae-1d24-4db9-b721-d6602fedd540 at 15g2000yqi.googlegroups.com>,
Peng Yu  <pengyu.ut at gmail.com> wrote:
>
>I don't find a general pdf library in python that can do any
>operations on pdfs.
>
>I want to automatically highlight certain words (using regex) in a
>pdf. Could somebody let me know if there is a tool to do so in python?

Did you Google at all?  "python pdf" finds this as the first link, though
I have no clue whether it does what you want:

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

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From spamfresser at ch3ka.de  Tue Mar 16 19:48:02 2010
From: spamfresser at ch3ka.de (Michael Rudolf)
Date: Wed, 17 Mar 2010 00:48:02 +0100
Subject: import antigravity
In-Reply-To: <mailman.870.1268772266.23598.python-list@python.org>
References: <hnnclk$eud$1@lust.ihug.co.nz>	<mailman.820.1268725930.23598.python-list@python.org>	<k88477-giu.ln1@satorlaser.homedns.org>	<4b9fdc50$0$22943$e4fe514c@news.xs4all.nl>
	<mailman.870.1268772266.23598.python-list@python.org>
Message-ID: <hnp5bh$paj$1@news.urz.uni-heidelberg.de>

Am 16.03.2010 21:44, schrieb Mark Lawrence:
> Who actually *IS* running the time machine?  Are there any bugs??

My is. And as I'm a lazy hacker: sure. there are bugs. lets just call 
them features and move on. nothing to see here ;)


From aahz at pythoncraft.com  Tue Mar 16 19:51:23 2010
From: aahz at pythoncraft.com (Aahz)
Date: 16 Mar 2010 16:51:23 -0700
Subject: Conditional based on whether or not a module is being used
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
	<mailman.376.1267819057.23598.python-list@python.org>
	<ec8e0912-bc85-4c51-85f5-fc855e289c1c@k6g2000prg.googlegroups.com>
Message-ID: <hnp5hr$jn4$1@panix5.panix.com>

In article <ec8e0912-bc85-4c51-85f5-fc855e289c1c at k6g2000prg.googlegroups.com>,
Pete Emerson  <pemerson at gmail.com> wrote:
>
>Excellent, this is what I finally discovered, although I was looking
>for 'foo' in sys.modules.keys(), which apparently isn't necessary.

Actually, `foo in sys.modules.keys()` is double-slow, because first the
dict must be scanned to create a list, and then the list must be scanned
linearly to test for foo.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From aahz at pythoncraft.com  Tue Mar 16 19:55:51 2010
From: aahz at pythoncraft.com (Aahz)
Date: 16 Mar 2010 16:55:51 -0700
Subject: Conditional based on whether or not a module is being used
References: <7efe6ba1-d58f-482c-9b35-dc9c67b02194@q2g2000pre.googlegroups.com>
	<29c6a957-5028-4c2d-8594-6c4db8243ef2@d2g2000yqa.googlegroups.com>
	<mailman.422.1267965329.23598.python-list@python.org>
	<42062deb-785a-4955-9ce0-d9fb7a26455d@j27g2000yqn.googlegroups.com>
Message-ID: <hnp5q7$qa4$1@panix5.panix.com>

In article <42062deb-785a-4955-9ce0-d9fb7a26455d at j27g2000yqn.googlegroups.com>,
Vinay Sajip  <vinay_sajip at yahoo.co.uk> wrote:
>
>I'm reviewing the documentation at the moment, as it happens, and it
>still seems hard to be able to put together a structure which is good
>for everyone. A full treatment, it seems to me, would talk a little
>about the detail of why things work as they do; but a lot of the time,
>people are just interested in getting going with the package, and less
>interested in the whys and wherefores. But for people trying to do more
>than the basics, that deeper understanding is sometimes necessary. The
>hard part is satisfying all audiences in one document!

Simple answer: don't

The main logging docs should be reference material, but the top of the
docs should link to a tutorial (or the other way around, but I think the
Python docs have generally preferred to make the primary doc reference).

Trying to make one page serve all documentation purposes rarely works.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From gagsl-py2 at yahoo.com.ar  Tue Mar 16 20:02:38 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 16 Mar 2010 21:02:38 -0300
Subject: cycling through options
References: <rie7hpcs5ic.fsf@alder.acc.bessy.de>
Message-ID: <op.u9oqeocux6zn5v@lepton.softlabbsas.com.ar>

En Tue, 16 Mar 2010 11:30:51 -0300, Dieter Faulbaum  
<Dieter.Faulbaum at bessy.de> escribi?:

> is there a better way for cycling through all options than this:
>
>
> (options, args) = parser.parse_args()
> for opt in options.__dict__.keys():
>      print opt, ":", options.__dict__[opt]

(I assume parser is an optparse.OptionParser instance)
You may rewrite it as:

for oname, ovalue in vars(options).iteritems():
   print oname, ":", ovalue

This assumes that the only instance attributes existing in 'options' are,  
uh, parsed options from the command line. I could not find such guarantee  
in the documentation. Another way would be to ask the parser about the  
options it knows of:

for oname in (o.dest for o in parser.option_list if o.dest):
   print oname, ":", getattr(options, oname, None)

-- 
Gabriel Genellina



From skippy.hammond at gmail.com  Tue Mar 16 20:08:10 2010
From: skippy.hammond at gmail.com (Mark Hammond)
Date: Wed, 17 Mar 2010 11:08:10 +1100
Subject: How to add a library path to pythonpath ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF684F3C883@enbmail01.lsi.com>
References: <mailman.62.1268737204.24845.python-list@python.org>	<7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>	<1fb1c371003160527q10add6bfk75c09b24bc486329@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C883@enbmail01.lsi.com>
Message-ID: <4BA01D6A.60208@gmail.com>

On 17/03/2010 1:26 AM, Barak, Ron wrote:
> Thanks for the suggestion Pable.
> However, I really need the $PYTHONPATH to include this additional
> library, so all Python scripts could use it.
> In Windows I have defined PYTHONPATH as
> c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\, and also in the
> Windows registry I have
> HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\/version/\PythonPath\ as
> C:\Python26\Lib;C:\Python26\DLLs;C:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\;C:\Python26\Lib\lib-tk;
> However, even with all the above, the SVMInspecor modules are not found.

You need to create your own sub-key, with any name, under the PythonPath 
key and add your path there.  The reason is that Python only looks for 
that root key when it can't sniff the location of the library itself 
based on the location of the executable - and in most cases it can. 
Python does however enumerate and use the sub-keys in all cases.

HTH,

Mark


From dg.gmane at thesamovar.net  Tue Mar 16 21:00:11 2010
From: dg.gmane at thesamovar.net (Dan Goodman)
Date: Wed, 17 Mar 2010 02:00:11 +0100
Subject: C++ code generation
Message-ID: <hnp9is$8gp$1@dough.gmane.org>

Hi all,

I'm doing some C++ code generation using Python, and would be interested 
in any comments on the approach I'm taking.

Basically, the problem involves doing some nested loops and executing 
relatively simple arithmetic code snippets, like:

for i in xrange(len(X)):
   X[i] += 5

Actually they're considerably more complicated than this, but this gives 
the basic idea. One way to get C++ code from this would be to use 
Cython, but there are two problems with doing that. The first problem is 
that the arithmetic code snippets are user-specified. What I want to do 
is generate code, and then compile and run it using Scipy's weave 
package. The second problem is that I have various different data 
structures and the C++ code generated needs to be different for the 
different structures (e.g. sparse or dense matrices).

So far what I've been doing is writing Python code that writes the C++ 
code, but in a very non-transparent way. I like the idea of specifying 
the C++ code using Python syntax, like in Cython. So the idea I came up 
with was basically to abuse generators and iterators so that when you 
write something like:

for x in X:
    ...

it actually outputs some C++ code that looks like:

for(int i=0; i<X_len; i++){
double &x = X[i];
...
}

The ... in the Python code is only executed once because when X is 
iterated over it only returns one value.

Here's the example I've written so far (complete code given below):

# initialisation code
code = OutputCode()
evaluate = Evaluator(code)
X = Array(code, 'values')
# specification of the C++ loop
for x in X:
     evaluate('x += 5; x *= 2')
# and show the output
print code.code

It generates the following C++ code:

for(int values_index=0; values_index<values_len; values_index++){
double &values = values_array[values_index];
values += 5;
values *= 2;
}

OK, so that's an overview of the idea that I have of how to do it. Any 
comments or suggestions on either the approach or the implementation?

Below is the complete code I've written for the example above (linewraps 
aren't perfect but there's only a couple of lines to correct).

Thanks for any feedback,

Dan

import re, inspect

# We just use this class to identify certain variables
class Symbol(str): pass

# This class is basically just a mutable string
class OutputCode(object):
     def __init__(self):
         self.code = ''
     def __iadd__(self, code):
         self.code = self.code+code
         return self

# Iterating over instances of this class generates code
# for iterating over a C++ array, it yields a single
# Symbol object, the variable name of the value in the
# array
class Array(object):
     def __init__(self, code, name, dtype='double'):
         self.name = name
         self.dtype = dtype
         self.code = code
     def __iter__(self):
         def f():
             self.code += 'for(int {name}_index=0; 
{name}_index<{name}_len; {name}_index++){{\n'.format(name=self.name)
             self.code += '{dtype} &{name} = 
{name}_array[{name}_index];\n'.format(dtype=self.dtype, name=self.name)
             yield Symbol(self.name)
             self.code += '}\n'
         return f()

# Instances of this class generate C++ code from Python syntax
# code snippets, replacing variable names that are a Symbol in the
# namespace with the value of that Symbol.
class Evaluator(object):
     def __init__(self, code):
         self.code = code
     def __call__(self, code):
         # The set of variables in the code snippet
         vars = re.findall(r'\b(\w+)\b', code)
         # Extract any names from the namespace of the calling frame
         frame = inspect.stack()[1][0]
         globals, locals = frame.f_globals, frame.f_locals
         values = {}
         for var in vars:
             if var in locals:
                 values[var] = locals[var]
             elif var in globals:
                 values[var] = globals[var]
         # Replace any variables whose values are Symbols with their values
         for var, value in values.iteritems():
             if isinstance(value, Symbol):
                 code = re.sub(r'\b{var}\b'.format(var=var), str(value), 
code)
         # Turn Python snippets into C++ (just a simplified version for now)
         code = code.replace(';', '\n')
         lines = [line.strip() for line in code.split('\n')]
         code = ''.join(line+';\n' for line in lines)
         self.code += code

if __name__=='__main__':
     code = OutputCode()
     evaluate = Evaluator(code)
     X = Array(code, 'values')
     for x in X:
         evaluate('x += 5; x *= 2')
     print code.code



From dr.cg at 126.com  Tue Mar 16 21:02:02 2010
From: dr.cg at 126.com (CHEN Guang)
Date: Wed, 17 Mar 2010 09:02:02 +0800 (CST)
Subject: Python bindings tutorial
Message-ID: <1e0af4b.bc0.12769a437c5.Coremail.dr.cg@126.com>


> Is there any tutorial how to write a bindings for a exe ( dos)
> program?
> I would like to run it from a Python directly
> ( using import command and a particular function from the binding)
> not using os.system command.
 
An example: PythoidC ( http://pythoidc.googlecode.com ), look at importTemplate.py
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From dr.cg at 126.com  Tue Mar 16 21:54:25 2010
From: dr.cg at 126.com (CHEN Guang)
Date: Wed, 17 Mar 2010 09:54:25 +0800 (CST)
Subject: C++ code generation
Message-ID: <11c0630.1732.12769d42e98.Coremail.dr.cg@126.com>

PythoidC ( http://pythoidc.googlecode.com ) is a C code generator (not C++)
 
----- Original Message ----- 
From: "Dan Goodman" <dg.gmane at thesamovar.net>
To: <python-list at python.org>
Sent: Wednesday, March 17, 2010 9:00 AM
Subject: C++ code generation


> Hi all,
> 
> I'm doing some C++ code generation using Python, and would be interested 
> in any comments on the approach I'm taking.
> 
> Basically, the problem involves doing some nested loops and executing 
> relatively simple arithmetic code snippets, like:
> 
> for i in xrange(len(X)):
>   X[i] += 5
> 
> Actually they're considerably more complicated than this, but this gives 
> the basic idea. One way to get C++ code from this would be to use 
> Cython, but there are two problems with doing that. The first problem is 
> that the arithmetic code snippets are user-specified. What I want to do 
> is generate code, and then compile and run it using Scipy's weave 
> package. The second problem is that I have various different data 
> structures and the C++ code generated needs to be different for the 
> different structures (e.g. sparse or dense matrices).
> 
> So far what I've been doing is writing Python code that writes the C++ 
> code, but in a very non-transparent way. I like the idea of specifying 
> the C++ code using Python syntax, like in Cython. So the idea I came up 
> with was basically to abuse generators and iterators so that when you 
> write something like:
> 
> for x in X:
>    ...
> 
> it actually outputs some C++ code that looks like:
> 
> for(int i=0; i<X_len; i++){
> double &x = X[i];
> ...
> }
> 
> The ... in the Python code is only executed once because when X is 
> iterated over it only returns one value.
> 
> Here's the example I've written so far (complete code given below):
> 
> # initialisation code
> code = OutputCode()
> evaluate = Evaluator(code)
> X = Array(code, 'values')
> # specification of the C++ loop
> for x in X:
>     evaluate('x += 5; x *= 2')
> # and show the output
> print code.code
> 
> It generates the following C++ code:
> 
> for(int values_index=0; values_index<values_len; values_index++){
> double &values = values_array[values_index];
> values += 5;
> values *= 2;
> }
> 
> OK, so that's an overview of the idea that I have of how to do it. Any 
> comments or suggestions on either the approach or the implementation?
> 
> Below is the complete code I've written for the example above (linewraps 
> aren't perfect but there's only a couple of lines to correct).
> 
> Thanks for any feedback,
> 
> Dan
> 
> import re, inspect
> 
> # We just use this class to identify certain variables
> class Symbol(str): pass
> 
> # This class is basically just a mutable string
> class OutputCode(object):
>     def __init__(self):
>         self.code = ''
>     def __iadd__(self, code):
>         self.code = self.code+code
>         return self
> 
> # Iterating over instances of this class generates code
> # for iterating over a C++ array, it yields a single
> # Symbol object, the variable name of the value in the
> # array
> class Array(object):
>     def __init__(self, code, name, dtype='double'):
>         self.name = name
>         self.dtype = dtype
>         self.code = code
>     def __iter__(self):
>         def f():
>             self.code += 'for(int {name}_index=0; 
> {name}_index<{name}_len; {name}_index++){{\n'.format(name=self.name)
>             self.code += '{dtype} &{name} = 
> {name}_array[{name}_index];\n'.format(dtype=self.dtype, name=self.name)
>             yield Symbol(self.name)
>             self.code += '}\n'
>         return f()
> 
> # Instances of this class generate C++ code from Python syntax
> # code snippets, replacing variable names that are a Symbol in the
> # namespace with the value of that Symbol.
> class Evaluator(object):
>     def __init__(self, code):
>         self.code = code
>     def __call__(self, code):
>         # The set of variables in the code snippet
>         vars = re.findall(r'\b(\w+)\b', code)
>         # Extract any names from the namespace of the calling frame
>         frame = inspect.stack()[1][0]
>         globals, locals = frame.f_globals, frame.f_locals
>         values = {}
>         for var in vars:
>             if var in locals:
>                 values[var] = locals[var]
>             elif var in globals:
>                 values[var] = globals[var]
>         # Replace any variables whose values are Symbols with their values
>         for var, value in values.iteritems():
>             if isinstance(value, Symbol):
>                 code = re.sub(r'\b{var}\b'.format(var=var), str(value), 
> code)
>         # Turn Python snippets into C++ (just a simplified version for now)
>         code = code.replace(';', '\n')
>         lines = [line.strip() for line in code.split('\n')]
>         code = ''.join(line+';\n' for line in lines)
>         self.code += code
> 
> if __name__=='__main__':
>     code = OutputCode()
>     evaluate = Evaluator(code)
>     X = Array(code, 'values')
>     for x in X:
>         evaluate('x += 5; x *= 2')
>     print code.code
> 
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From gagsl-py2 at yahoo.com.ar  Tue Mar 16 22:07:42 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 16 Mar 2010 23:07:42 -0300
Subject: How to handle file uploads with http.server
References: <91ad5bf81003110221m5e383f8fkc7959aa2887927eb@mail.gmail.com>
	<4728DC0EADB2654E8BA2A487F0CF2785AD6D2E@ws-ukexchange.internal.biowisdom.com>
Message-ID: <op.u9ov64scx6zn5v@lepton.softlabbsas.com.ar>

En Thu, 11 Mar 2010 07:30:24 -0300, Neil Blue <Neil.Blue at biowisdom.com>  
escribi?:

> I have a basic http.server instance running (class
> HTTPHandler(http.server.BaseHTTPRequestHandler), with python 3.1, and I
> would like to upload files with multipart forms.
>
> def do_POST(self):
> 	ctype, pdict = cgi.parse_header(self.headers['Content-Type'])
> 	if ctype=='multipart/form-data':
> 		print('parsing...')
> 		query=cgi.parse_multipart(self.rfile, pdict)
> 		print(query)
>
> However the file never seems to finish being parsed. There are no errors,
> but the call hangs at: query=cgi.parse_multipart(self.rfile, pdict)

This may be related to this bug:

http://bugs.python.org/issue8077

reported last week by Mitchell L. Model in this thread:

http://groups.google.com/group/comp.lang.python/t/8a7752bd79d5f5d6/

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Tue Mar 16 22:21:14 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 16 Mar 2010 23:21:14 -0300
Subject: Exiting gracefully from ThreadingTCPServer
References: <1f31cddf-1104-4579-bd61-5fad3b2c4677@t17g2000prg.googlegroups.com>
Message-ID: <op.u9owtonkx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 12 Mar 2010 12:15:16 -0300, Pete Emerson <pemerson at gmail.com>  
escribi?:

> I'm trying to get threading going for the first time in python, and
> I'm trying to modify code I found so that I can have the server close
> the TCP connections and exit gracefully. Two problems:

Which Python version?

> 1) While the KeyboardInterrupt works, if I make more than 0 curls to
> the server and then quit, I can't run it again right away and get
> this:
> socket.error: [Errno 48] Address already in use
>
> Not all of my connections are closing properly. How do I fix this?
>
> 2) curling localhost:8080/quit does show the "Quitting" output that I
> expect, but doesn't quit the server until I manually control-c it.

On Python 2.6, you should call the shutdown() method (from another  
thread!) instead of simply server_close()
See this recipe [1] -- just look at the main() function (disregard all the  
previous details); it runs the server(s) in their own thread, the main  
thread just sits and waits for KeyboardInterrupt or SystemExit.

[1] http://code.activestate.com/recipes/577025

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Tue Mar 16 22:25:50 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 16 Mar 2010 23:25:50 -0300
Subject: datetime string conversion error
References: <8cebc349-33d5-4820-a944-2e6869408f0f@c34g2000pri.googlegroups.com>
	<f1829de4-43d9-4e14-b9ea-9ee170358641@k24g2000pro.googlegroups.com>
Message-ID: <op.u9ow1cd4x6zn5v@lepton.softlabbsas.com.ar>

En Tue, 16 Mar 2010 20:31:11 -0300, Josh English  
<joshua.r.english at gmail.com> escribi?:

> On Mar 16, 11:56 am, Jordan Apgar <twistedphr... at gmail.com> wrote:
>
>> here's what I'm doing:
>> date = "2010-03-16 14:46:38.409137"
>>  olddate = datetime.strptime(date,"%Y-%m-%j %H:%M:%S.%f")
>>
>
> Due to circumstances, I'm using Python 2.5.4 on one machine (2.6 on
> the other).
>
> When I have a script as simple as this:
>
> import datetime
>
> datetime.datetime.strptime('2010-09-14', "%Y-%m-%d")
>
>
> Running this script brings up a calendar, believe it or not. The
> calendar displays March 2010, and shows the 22nd as a holiday. When I
> dismiss the dialog box I get:
> Traceback (most recent call last):
>   File "strptimetest.py", line 3, in <module>
>     datetime.datetime.strptime('2010-09-14', "%Y-%m-%d")
>   File "C:\Python25\lib\_strptime.py", line 272, in <module>
>     _TimeRE_cache = TimeRE()
>   File "C:\Python25\lib\_strptime.py", line 191, in __init__
>     self.locale_time = LocaleTime()
>   File "C:\Python25\lib\_strptime.py", line 74, in __init__
>     self.__calc_weekday()
>   File "C:\Python25\lib\_strptime.py", line 94, in __calc_weekday
>     a_weekday = [calendar.day_abbr[i].lower() for i in range(7)]
> AttributeError: 'module' object has no attribute 'day_abbr'

I'd say you have a calendar.py script somewhere along your sys.path, that  
shadows the calendar module in the standard library.

-- 
Gabriel Genellina



From googler.1.webmaster at spamgourmet.com  Tue Mar 16 22:45:50 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Tue, 16 Mar 2010 19:45:50 -0700 (PDT)
Subject: C-API PyObject_Call
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
	<mailman.849.1268756405.23598.python-list@python.org>
	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>
	<mailman.858.1268759662.23598.python-list@python.org>
	<c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>
	<afa22b98-e955-4559-a077-982cf55a3cab@q16g2000yqq.googlegroups.com>
Message-ID: <6d496959-1397-427d-82d3-9c11ca956e54@33g2000yqj.googlegroups.com>

At first thanks for your answers!!!

On 16 Mrz., 21:16, Carl Banks <pavlovevide... at gmail.com> wrote:
> Here you raise an exception with a C statement,
> and catch and print it in the very next line. ?The exception doesn't
> exit from Python code so there are no lines to print.

Exactly, I dont expect any line/file information. I am just looking
forward for a solution how to solve that. I would like to avoid
the use of the debugger in this case.

My ideas:

1. I thought the return value might contain any information where it
is from.
2. Otherwise it would be cool if there are any information available
in which line, file
the last called function/method exited.

Bye, moerchendiser2k3


From hidura at gmail.com  Tue Mar 16 23:08:17 2010
From: hidura at gmail.com (hidura at gmail.com)
Date: Wed, 17 Mar 2010 03:08:17 +0000
Subject: Web Hosting Python 3
Message-ID: <0016e64642280288940481f66d5e@google.com>

Hello list, i am in a project what need hosting, who give hosting to  
python3?
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From pmaupin at gmail.com  Wed Mar 17 00:12:16 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Tue, 16 Mar 2010 21:12:16 -0700 (PDT)
Subject: highlight words by regex in pdf files using python
References: <af0830ae-1d24-4db9-b721-d6602fedd540@15g2000yqi.googlegroups.com>
Message-ID: <1fc72785-e527-4809-b5a1-43d78fe86f87@r27g2000yqn.googlegroups.com>

On Mar 4, 6:57?pm, Peng Yu <pengyu... at gmail.com> wrote:
> I don't find a general pdf library in python that can do any
> operations on pdfs.
>
> I want to automatically highlight certain words (using regex) in a
> pdf. Could somebody let me know if there is a tool to do so in python?

The problem with PDFs is that they can be quite complicated.  There is
the outer container structure, which isn't too bad (unless the
document author applied encryption or fancy multi-object compression),
but then inside the graphics elements, things could be stored as
regular ASCII, or as fancy indexes into font-specific tables.  Not
rocket science, but the only industrial-strength solution for this is
probably reportlab's pagecatcher.

I have a library which works (primarily with the outer container) for
reading and writing, called pdfrw.  I also maintain a list of other
PDF tools at http://code.google.com/p/pdfrw/wiki/OtherLibraries  It
may be that pdfminer (link on that page) will do what you want -- it
is certainly trying to be complete as a PDF reader.  But I've never
personally used pdfminer.

One of my pdfrw examples at http://code.google.com/p/pdfrw/wiki/ExampleTools
will read in preexisting PDFs and write them out to a reportlab
canvas.  This works quite well on a few very simple ASCII PDFs, but
the font handling needs a lot of work and probably won't work at all
right now on unicode.  (But if you wanted to improve it, I certainly
would accept patches or give you commit rights!)

That pdfrw example does graphics reasonably well.  I was actually
going down that path for getting better vector graphics into rst2pdf
(both uniconvertor and svglib were broken for my purposes), but then I
realized that the PDF spec allows you to include a page from another
PDF quite easily (the spec calls it a form xObject), so you don't
actually need to parse down into the graphics stream for that.  So,
right now, the best way to do vector graphics with rst2pdf is either
to give it a preexisting PDF (which it passes off to pdfrw for
conversion into a form xObject), or to give it a .svg file and invoke
it with -e inkscape, and then it will use inkscape to convert the svg
to a pdf and then go through the same path.

HTH,
Pat


From levi.india at gmail.com  Wed Mar 17 00:15:46 2010
From: levi.india at gmail.com (pothuri ramesh)
Date: Tue, 16 Mar 2010 21:15:46 -0700 (PDT)
Subject: Data entry Work available
Message-ID: <09d51eec-68e7-4dac-a5bd-6bc3b0b656d6@l40g2000pro.googlegroups.com>

Data entry works Available At
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From lie.1296 at gmail.com  Wed Mar 17 00:57:17 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Wed, 17 Mar 2010 15:57:17 +1100
Subject: to pass self or not to pass self
In-Reply-To: <mailman.860.1268765949.23598.python-list@python.org>
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org>
Message-ID: <4ba06148$1@dnews.tpgi.com.au>

On 03/17/2010 05:59 AM, Jason Tackaberry wrote:
> On Tue, 2010-03-16 at 10:04 +0100, Bruno Desthuilliers wrote:
>> Answer here:
>>
>> http://wiki.python.org/moin/FromFunctionToMethod
> 
> I have a sense I used to know this once upon a time, but the question
> came to my mind (possibly again) and I couldn't think of an answer:
> 
> Why not create the bound methods at instantiation time, rather than
> using the descriptor protocol which has the overhead of creating a new
> bound method each time the method attribute is accessed?

Because people wanted it like so. There was once, a time when python
doesn't have the descriptor protocol (old-style classes) and many people
feels that a high-level language like python should provide some
additional hooks for customizing attribute access which the existing
solutions like __getattr__ and __setattr__ couldn't easily provide. The
result is new-style class. Most people probably would never need to use
descriptor protocol directly, since the immediate benefit of descriptor
protocol are property(), classmethod(), and instancemethod() decorators
which, without descriptor protocol, would never become a possibility.


From sbassi at clubdelarazon.org  Wed Mar 17 01:22:49 2010
From: sbassi at clubdelarazon.org (Sebastian Bassi)
Date: Wed, 17 Mar 2010 02:22:49 -0300
Subject: Converting Python CGI to WSGI scripts
In-Reply-To: <1268759895.28810.1365130739@webmail.messagingengine.com>
References: <1268759895.28810.1365130739@webmail.messagingengine.com>
Message-ID: <9e2f512b1003162222v98772d0u8d3aea8ced1ee7bb@mail.gmail.com>

On Tue, Mar 16, 2010 at 2:18 PM,  <python at bdurham.com> wrote:
> I have a few dozen simple Python CGI scripts.
> Are there any advantages or disadvantages to rewriting these CGI scripts as
> WSGI scripts?

It depends of the script. WSGI should be faster since you don't start
a Python instance for each call (as in CGI).

-- 
Sebasti?n Bassi. Diplomado en Ciencia y Tecnolog?a.

Curso de Python en un d?a: http://bit.ly/cursopython
Python for Bioinformatics: http://tinyurl.com/biopython

Non standard disclaimer: READ CAREFULLY. By reading this email,
you agree, on behalf of your employer, to release me from all
obligations and waivers arising from any and all NON-NEGOTIATED
agreements, licenses, terms-of-service, shrinkwrap, clickwrap,
browsewrap, confidentiality, non-disclosure, non-compete and
acceptable use policies ("BOGUS AGREEMENTS") that I have
entered into with your employer, its partners, licensors, agents and
assigns, in perpetuity, without prejudice to my ongoing rights and
privileges. You further represent that you have the authority to release
me from any BOGUS AGREEMENTS on behalf of your employer.


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 17 01:32:05 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 17 Mar 2010 05:32:05 GMT
Subject: to pass self or not to pass self
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org>
	<4ba06148$1@dnews.tpgi.com.au>
Message-ID: <pan.2010.03.17.05.32.04@REMOVE.THIS.cybersource.com.au>

On Wed, 17 Mar 2010 15:57:17 +1100, Lie Ryan wrote:

> Most people probably would never need to use
> descriptor protocol directly, since the immediate benefit of descriptor
> protocol are property(), classmethod(), and instancemethod() decorators
> which, without descriptor protocol, would never become a possibility.


There's an instancemethod decorator? Where?

Are you thinking of staticmethod? "instancemethod", if you mean what I 
think you mean, doesn't need a decorator because it is the default 
behaviour for new-style classes.


-- 
Steven


From pmaupin at gmail.com  Wed Mar 17 01:35:03 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Tue, 16 Mar 2010 22:35:03 -0700 (PDT)
Subject: to pass self or not to pass self
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org>
Message-ID: <4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com>

On Mar 16, 1:59?pm, Jason Tackaberry <t... at urandom.ca> wrote:
> Why not create the bound methods at instantiation time, rather than
> using the descriptor protocol which has the overhead of creating a new
> bound method each time the method attribute is accessed?

Well, for one thing, Python classes are open.  They can be added to at
any time.  For another thing, you might not ever use most of the
methods of an instance, so it would be a huge waste to create those.

Also, this area has been optimized for normal usage patterns quite
heavily, to the point where attempted "optimizations" can lead to
results that are, on the surface, quite counterintuitive.

For example, if you want to take the length of a lot of different
strings, you might think you could save time by binding a local
variable to str.__len__ and using that on the strings.  Here is an
example:

>>> def a(s, count, lenfunc):
...     for i in xrange(count):
...        z = lenfunc(s)
...
>>> a('abcdef', 100000000, len)
>>> a('abcdef', 100000000, str.__len__)

Running cPython 2.6 on my machine, len() runs about 3 times faster
than str.__len__().  The overhead of checking that an object is usable
with a particular class method far outweighs the cost of creating the
bound method!

So, one thought for the OP.  Whenever I have a dictionary that
contains class methods in it, if I'm going to use it heavily, I often
recode it to create the dictionary at object creation time with bound
methods in it.

Regards,
Pat


From joshua.r.english at gmail.com  Wed Mar 17 02:13:47 2010
From: joshua.r.english at gmail.com (Josh English)
Date: Tue, 16 Mar 2010 23:13:47 -0700 (PDT)
Subject: Dynamic Class Creation
References: <b05e819c-a005-49d4-b0e7-78be9a56b268@q2g2000pre.googlegroups.com>
	<mailman.816.1268720338.23598.python-list@python.org>
Message-ID: <8d79f0cb-9c5b-4243-8891-a15fb311f652@z18g2000prh.googlegroups.com>

Chris,

Thanks. This worked for the attributes, but I think the tactic is
still misleading. There are child elements I can't quite determine how
to deal with:

<market code='anlg' tier='ProMarket' mail='True'>
    <title field="pref">Analog Science Fiction and Fact</title>
    <nickname>Analog</nickname>
    <keyword>Science Fiction</keyword>
    <keyword>First Contact</keyword>
    <keyword>Hard Science Fiction</keyword>
    <address>
        <attnline>Stanley Schmidt, Editor</attnline>
        <address1>267 Broadway, 4th Floor</address1>
        <address2>New York, NY 10007-2352</address2>
    </address>
    <website>http://www.analogsf.com</website>
</market>

A child element with text and an attribute or two, for example, pose a
problem. I can call Market.title but should I try Market.title.field
or Market.title_field.

Multiple elements, such as keywords, are allowed in xml but harder to
map to the object. I don't know if I want to go create a list and
methods for accessing those keywords as a list, or redefine the rules
of my XML to not allow multiple child elements with the same tag. I
can't decide.

Then the address is a bit of a bear.

In short, I have to figure out the whole object interface to the XML
and how I want that to work.

Thanks for the suggestion. It is undeniably clever.

Josh


From tino at wildenhain.de  Wed Mar 17 02:30:36 2010
From: tino at wildenhain.de (Tino Wildenhain)
Date: Wed, 17 Mar 2010 07:30:36 +0100
Subject: Function that knows its argument's variable name
In-Reply-To: <47e725b6-1470-4563-a64b-02630032ef36@g26g2000yqn.googlegroups.com>
References: <47e725b6-1470-4563-a64b-02630032ef36@g26g2000yqn.googlegroups.com>
Message-ID: <4BA0770C.2070306@wildenhain.de>

Hi,

Am 14.03.2010 12:58, schrieb Helge Stenstr?m:
> I want to write  function that prints a value of a variable, for
> debugging. Like:
>
> with
>
> myVariable = "parrot"
> otherVariable = "dead"
>
> probe(myVariable)
> probe(otherVariable)
>
> instead of the longer
>
> print "myVariable = ", myVariable
> print "otherVariable = ", otherVariable
>
> Is that even possible?
>
> The function would look like
>
> def probe(var):
>      nameOfVar = someMagic(var)
>      print nameOfVar, " = ", var
>
> but can someMagic(var) find the variable name? Is that possible?

apart from very hackery, why don't you just use:

def probe(**vars):
     for varname,value in vars.items():
         print "%s = %r" % (varname,value)

and call it like that:

probe(myvar="foo")
probe(othervar="bar")

or even

probe(myvar=myvar) (if myvar was assigned before)

please note introspective approaches have a very narrow field
where they can work - as already shown in other posts: you can have
values w/o names and also more then one name to a value (or object).

Regards
Tino Wildenhain

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From nagle at animats.com  Wed Mar 17 02:34:21 2010
From: nagle at animats.com (John Nagle)
Date: Tue, 16 Mar 2010 23:34:21 -0700
Subject: Converting Python CGI to WSGI scripts
In-Reply-To: <mailman.882.1268803376.23598.python-list@python.org>
References: <1268759895.28810.1365130739@webmail.messagingengine.com>
	<mailman.882.1268803376.23598.python-list@python.org>
Message-ID: <4ba0735b$0$1594$742ec2ed@news.sonic.net>

Sebastian Bassi wrote:
> On Tue, Mar 16, 2010 at 2:18 PM,  <python at bdurham.com> wrote:
>> I have a few dozen simple Python CGI scripts.
>> Are there any advantages or disadvantages to rewriting these CGI scripts as
>> WSGI scripts?
> 
> It depends of the script. WSGI should be faster since you don't start
> a Python instance for each call (as in CGI).

    It's almost always faster.  But be careful about global state.
Remember that WSGI/FCGI programs are really functions, called
over and over with a new transaction on each call.  So your
function has to be reusable.

    Things like initializing global variables at program load time,
rather than when the main function is called, may give trouble.
Also, be careful about leaving files, database connections, and
sockets open after the main function returns.

				John Nagle


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From stefan_ml at behnel.de  Wed Mar 17 02:46:20 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 17 Mar 2010 07:46:20 +0100
Subject: C-API PyObject_Call
In-Reply-To: <c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>	<mailman.849.1268756405.23598.python-list@python.org>	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>	<mailman.858.1268759662.23598.python-list@python.org>
	<c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>
Message-ID: <hnptrs$m4t$1@dough.gmane.org>

moerchendiser2k3, 16.03.2010 19:25:
> Hi, currently I am not at home, I will post some stuff when I am back.
> Just the note: I throw an exception with the C API.
>
> Looks like that
>
>
> PyObject *result = PyObject_Call(my_isntance, "", NULL);
> if(result==NULL)
> {
>      PyErr_Print(); //when this happens, the traceback is correct with
> information about the file/line
>      return;
> }
>
> if(!PyXYZ_Check(result))
> {
>      PyErr_SetString(PyExc_TypeError, "Wrong type, ....");
>      PyErr_Print(); //missing information of the file/line.
>      return;
> }
>
> Well, I expect, that there are no information about the line/file, so
> I know something is missing, but what is missing?

Two solutions here:

1) put the line number information into the message string when you raise 
the exception

2) use Cython instead of plain C, as Cython will automatically generate 
readable stack traces for you, also for non-Python functions.

Stefan



From stefan_ml at behnel.de  Wed Mar 17 02:48:31 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 17 Mar 2010 07:48:31 +0100
Subject: import antigravity
In-Reply-To: <hnp5bh$paj$1@news.urz.uni-heidelberg.de>
References: <hnnclk$eud$1@lust.ihug.co.nz>	<mailman.820.1268725930.23598.python-list@python.org>	<k88477-giu.ln1@satorlaser.homedns.org>	<4b9fdc50$0$22943$e4fe514c@news.xs4all.nl>	<mailman.870.1268772266.23598.python-list@python.org>
	<hnp5bh$paj$1@news.urz.uni-heidelberg.de>
Message-ID: <hnptvv$m4t$2@dough.gmane.org>

Michael Rudolf, 17.03.2010 00:48:
> Am 16.03.2010 21:44, schrieb Mark Lawrence:
>> Who actually *IS* running the time machine? Are there any bugs??
>
> My is. And as I'm a lazy hacker: sure. there are bugs. lets just call
> them features and move on. nothing to see here ;)

I'll know it, I'll just know it!

Stefan



From stefan_ml at behnel.de  Wed Mar 17 02:54:04 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 17 Mar 2010 07:54:04 +0100
Subject: C++ code generation
In-Reply-To: <11c0630.1732.12769d42e98.Coremail.dr.cg@126.com>
References: <11c0630.1732.12769d42e98.Coremail.dr.cg@126.com>
Message-ID: <hnpuac$m4t$3@dough.gmane.org>

CHEN Guang, 17.03.2010 02:54:
> ----- Original Message -----
> From: "Dan Goodman"<dg.gmane at thesamovar.net>
>
>> I'm doing some C++ code generation using Python, and would be interested
>> in any comments on the approach I'm taking.
>
> PythoidC ( http://pythoidc.googlecode.com ) is a C code generator (not C++)

It would be nice if you could start reading the posts before you answer, 
and then try to give an answer that fits the question.

Stefan



From sam at sambull.co.uk  Wed Mar 17 04:43:38 2010
From: sam at sambull.co.uk (Sam Bull)
Date: Wed, 17 Mar 2010 08:43:38 +0000
Subject: Timer
Message-ID: <1268815418.2682.31.camel@s-desktop>

I'm writing a pyGTK program, and I need to display the contents of a
window for a few seconds before automatically moving on. I have tried
using the time.sleep method, but this has problems, such as the program
becoming unresponsive.

I have now attempted to use a timer, but this does not seem to run the
function at the end of the time. The code of my latest attempt:

def next(self=None, testnum=10, testspeed=5):
    self.count += 1
    #Sets label, telling the user the next word to memorise
    self.nobtns.set_markup("Word %s is: %s" % (self.count,
self.words[self.count-1]))
    self.nobtns.show()
    if self.count == testnum: #When all words are shown
        self.nobtns.hide()
    else:
        self.timer = threading.Timer(testspeed, self.next, [testnum,
testspeed])
        self.timer.start()

Putting a print statement at the beginning of the function, I can see
that the function is not being run by the timer. Any help on getting
this working would be appreciated.

Thanks,
Sam Bull
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From anand.shashwat at gmail.com  Wed Mar 17 04:46:00 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Wed, 17 Mar 2010 14:16:00 +0530
Subject: using DictionaryServices module to get work with python2.6 
	#OSXspecific
Message-ID: <d4ab53de1003170146s7fe5e153mea5d61dd1060a19c@mail.gmail.com>

I wanted to use dictionary in my OSX terminal.
So I wrote a function dict() in my ~/.bash_profile

dict () {
    python2.5 -c 'import sys, DictionaryServices; word = "
".join(sys.argv[1:]); print DictionaryServices.DCSCopyTextDefinition(None,
word, (0, len(word)))' $@
}

here is the output:

Shashwat-Anands-MacBook-Pro:Desktop l0nwlf$ dict lone wolf
noun
a person who prefers to act or be alone.

The question is why not :
DictionaryServices.DCSCopyTextDefinition(None, word, (0, len(word))) works
with python2.6 ?
Is DictionaryService module not available for python2.6 ?

Here is the stack-trace:

Shashwat-Anands-MacBook-Pro:Desktop l0nwlf$ python
Python 2.6.1 (r261:67515, Jul  7 2009, 23:51:51)
[GCC 4.2.1 (Apple Inc. build 5646)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import DictionaryServices
>>> word = "lone wolf"
>>> DictionaryServices.DCSCopyTextDefinition(None, word, (0, len(word)))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: NSRangeException - *** -[OC_PythonString
_createSubstringWithRange:]: Range or index out of bounds
>>>

Ofcourse it doesnt work with python2.7 too. Is this OSX specific issue ? Can
I make it work with my compiled version of python ? Is there any workaround
?
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From grflanagan at gmail.com  Wed Mar 17 04:54:14 2010
From: grflanagan at gmail.com (Gerard Flanagan)
Date: Wed, 17 Mar 2010 08:54:14 +0000
Subject: Dynamic Class Creation
In-Reply-To: <8d79f0cb-9c5b-4243-8891-a15fb311f652@z18g2000prh.googlegroups.com>
References: <b05e819c-a005-49d4-b0e7-78be9a56b268@q2g2000pre.googlegroups.com>	<mailman.816.1268720338.23598.python-list@python.org>
	<8d79f0cb-9c5b-4243-8891-a15fb311f652@z18g2000prh.googlegroups.com>
Message-ID: <hnq5bn$d10$1@dough.gmane.org>

Josh English wrote:
> Chris,
> 
> Thanks. This worked for the attributes, but I think the tactic is
> still misleading. There are child elements I can't quite determine how
> to deal with:
> 
> <market code='anlg' tier='ProMarket' mail='True'>
>     <title field="pref">Analog Science Fiction and Fact</title>
>     <nickname>Analog</nickname>
>     <keyword>Science Fiction</keyword>
>     <keyword>First Contact</keyword>
>     <keyword>Hard Science Fiction</keyword>
>     <address>
>         <attnline>Stanley Schmidt, Editor</attnline>
>         <address1>267 Broadway, 4th Floor</address1>
>         <address2>New York, NY 10007-2352</address2>
>     </address>
>     <website>http://www.analogsf.com</website>
> </market>
> 
> A child element with text and an attribute or two, for example, pose a
> problem. I can call Market.title but should I try Market.title.field
> or Market.title_field.
> 
> Multiple elements, such as keywords, are allowed in xml but harder to
> map to the object. I don't know if I want to go create a list and
> methods for accessing those keywords as a list, or redefine the rules
> of my XML to not allow multiple child elements with the same tag. I
> can't decide.
> 
> Then the address is a bit of a bear.
> 
> In short, I have to figure out the whole object interface to the XML
> and how I want that to work.
> 


Have you heard of or considered PyXB (http://pyxb.sourceforge.net/)? Not 
that I've much experience with it, but you can use it to generate python 
code from XML Schema files, and, I think, WSDL definitions. It's a bit 
of a rabbit hole, but then isn't that half the fun!

The following might give you the idea. You start with a Schema 
schema.xsd, generate a python module from it, then read in some XML with 
the generated classes to get your custom objects.


---------------- schema.xsd ----------------------

<xs:schema targetNamespace="http://www.josh.com/schema/0.1"
         xmlns:xs="http://www.w3.org/2001/XMLSchema"
         xmlns:josh="http://www.josh.com/schema/0.1">


     <xs:element name="market" type="josh:MarketType"/>

     <xs:complexType name="MarketType">
         <xs:sequence>
             <xs:element name="title" type="josh:TitleType"/>
             <xs:element name="nickname" type="xs:string"/>
             <xs:element name="keyword" type="xs:string" 
maxOccurs="unbounded"/>
             <xs:element name="address" type="josh:USAddress"/>
             <xs:element name="website" type="xs:string"/>
         </xs:sequence>
         <xs:attributeGroup ref="josh:MarketAttributes"/>
     </xs:complexType>

     <xs:complexType name="TitleType">
         <xs:simpleContent>
             <xs:extension base="xs:string">
                 <xs:attribute name="field" type="xs:string"/>
             </xs:extension>
         </xs:simpleContent>
     </xs:complexType>

     <xs:attributeGroup name="MarketAttributes">
         <xs:attribute name="code" type="xs:string"/>
         <xs:attribute name="tier" type="xs:string"/>
         <xs:attribute name="mail" type="xs:string"/>
     </xs:attributeGroup>

     <xs:complexType name="Address" abstract="true">
         <xs:sequence>
             <xs:element name="name"   type="xs:string"/>
             <xs:element name="street" type="xs:string"/>
             <xs:element name="city"   type="xs:string"/>
         </xs:sequence>
     </xs:complexType>

     <xs:complexType name="USAddress">
         <xs:complexContent>
             <xs:extension base="josh:Address">
                 <xs:sequence>
                     <xs:element name="state" type="josh:USState" 
minOccurs="0"/>
                     <xs:element name="zip"   type="xs:positiveInteger" 
minOccurs="0"/>
                 </xs:sequence>
             </xs:extension>
         </xs:complexContent>
     </xs:complexType>

     <xs:simpleType name="USState">
         <xs:restriction base="xs:string">
             <xs:enumeration value="AK"/>
             <xs:enumeration value="AL"/>
             <xs:enumeration value="AR"/>
             <!-- and so on ... -->
         </xs:restriction>
     </xs:simpleType>

</xs:schema>

---------------- genbindings.sh ---------------------------

#!/bin/sh

pyxbgen -u schema.xsd -m market_binding -r

---------------- demo.py -----------------------------------

s = """<?xml version="1.0"?>
<josh:market
     xmlns:josh="http://www.josh.com/schema/0.1"
     code="anlg"
     tier="ProMarket"
     mail="True">

     <title field="pref">Analog Science Fiction and Fact</title>
     <nickname>Analog</nickname>
     <keyword>Science Fiction</keyword>
     <keyword>First Contact</keyword>
     <keyword>Hard Science Fiction</keyword>
     <address>
         <name>Stanley Schmidt, Editor</name>
         <street>267 Broadway, 4th Floor</street>
         <city>New York</city>
     </address>
     <website>http://www.analogsf.com</website>
</josh:market>
"""

import xml.dom.minidom
import market_binding

market = 
market_binding.CreateFromDOM(xml.dom.minidom.parseString(s).documentElement)

print market.tier
print market.code
print market.keyword
assert len(market.keyword) == 3
print market.address.name
print market.toxml()





From breamoreboy at yahoo.co.uk  Wed Mar 17 04:56:48 2010
From: breamoreboy at yahoo.co.uk (Mark Lawrence)
Date: Wed, 17 Mar 2010 08:56:48 +0000
Subject: using DictionaryServices module to get work with python2.6
	#OSXspecific
In-Reply-To: <d4ab53de1003170146s7fe5e153mea5d61dd1060a19c@mail.gmail.com>
References: <d4ab53de1003170146s7fe5e153mea5d61dd1060a19c@mail.gmail.com>
Message-ID: <hnq5gi$dal$1@dough.gmane.org>

Shashwat Anand wrote:
> I wanted to use dictionary in my OSX terminal.
> So I wrote a function dict() in my ~/.bash_profile
> 
> dict () {
>     python2.5 -c 'import sys, DictionaryServices; word = "
> ".join(sys.argv[1:]); print DictionaryServices.DCSCopyTextDefinition(None,
> word, (0, len(word)))' $@
> }
> 
> here is the output:
> 
> Shashwat-Anands-MacBook-Pro:Desktop l0nwlf$ dict lone wolf
> noun
> a person who prefers to act or be alone.
> 
> The question is why not :
> DictionaryServices.DCSCopyTextDefinition(None, word, (0, len(word))) works
> with python2.6 ?
> Is DictionaryService module not available for python2.6 ?
> 
> Here is the stack-trace:
> 
> Shashwat-Anands-MacBook-Pro:Desktop l0nwlf$ python
> Python 2.6.1 (r261:67515, Jul  7 2009, 23:51:51)
> [GCC 4.2.1 (Apple Inc. build 5646)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
>>>> import DictionaryServices
>>>> word = "lone wolf"
>>>> DictionaryServices.DCSCopyTextDefinition(None, word, (0, len(word)))
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> IndexError: NSRangeException - *** -[OC_PythonString
> _createSubstringWithRange:]: Range or index out of bounds
> 
> Ofcourse it doesnt work with python2.7 too. Is this OSX specific issue ? Can
> I make it work with my compiled version of python ? Is there any workaround
> ?
> 
> 

Are you thinking of this?
http://pypi.python.org/pypi/pyobjc-framework-DictionaryServices/2.2

HTH.

Mark Lawrence



From Ron.Barak at lsi.com  Wed Mar 17 04:58:47 2010
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Wed, 17 Mar 2010 08:58:47 +0000
Subject: How to add a library path to pythonpath ?
In-Reply-To: <4B9FB09A.7030609@ieee.org>
References: <mailman.62.1268737204.24845.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>
	<1fb1c371003160527q10add6bfk75c09b24bc486329@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C883@enbmail01.lsi.com>
	<4B9F9DD0.2080306@ieee.org>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C894@enbmail01.lsi.com>
	<4B9FB09A.7030609@ieee.org>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF684F3C8DF@enbmail01.lsi.com>



> -----Original Message-----
> From: Dave Angel [mailto:davea at ieee.org]
> Sent: Tuesday, March 16, 2010 6:24 PM
> To: Barak, Ron
> Cc: Pablo Recio Quijano; python-list at python.org
> Subject: Re: How to add a library path to pythonpath ?
>
> Barak, Ron wrote:
> >
> >> -----Original Message-----
> >> From: Dave Angel [mailto:davea at ieee.org]
> >> Sent: Tuesday, March 16, 2010 5:04 PM
> >> To: Barak, Ron
> >> Cc: Pablo Recio Quijano; python-list at python.org
> >> Subject: RE: How to add a library path to pythonpath ?
> >>
> >>
> >>
> >> Barak, Ron wrote:
> >>
> >>> Thanks for the suggestion Pable.
> >>>
> >>> However, I really need the $PYTHONPATH to include this
> >>>
> >> additional library, so all Python scripts could use it.
> >>
> >>> In Windows I have defined PYTHONPATH as
> >>> c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\, and
> also in the
> >>> Windows registry I have
> >>>
> >>>
> >>>
> >>
> HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\version\PythonPath\ as
> >>
> >>
> C:\Python26\Lib;C:\Python26\DLLs;C:\views\cc_view\TS_svm_ts_tool\SVMI
> >> n
> >>
> >>> spector\lib\;C:\Python26\Lib\lib-tk;
> >>>
> >>> However, even with all the above, the SVMInspecor modules
> >>>
> >> are not found.
> >>
> >>>
> >> See my response at the end.  Top-posting makes for a very
> confusing
> >> thread.
> >>
> >>> <snip>
> >>>
> >>> 2010/3/16 Barak, Ron <Ron.Barak at lsi.com<mailto:Ron.Barak at lsi.com>>
> >>>
> >>> Hi,
> >>>
> >>> I'm trying to add a library path to my pythonpath, but
> >>>
> >> seems it is not
> >>
> >>> accepted -
> >>>
> >>> On Windows DOS window:
> >>>
> >>> C:\>echo %PYTHONPATH%
> >>> c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\
> >>>
> >>> C:\>python -c "import sys ; print sys.path"
> >>> ['', 'c:\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
> >>> 'C:\\WINDOWS\\syst em32\\python26.zip', 'C:\\Python26\\DLLs',
> >>> 'C:\\Python26\\lib', 'C:\\Python26\\l ib\\plat-win',
> >>> 'C:\\Python26\\lib\\lib-tk', 'C:\\Python26', 'C:\\Python26\\lib\\
> >>> site-packages',
> >>> 'C:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
> >>>
> >>> C:\>
> >>>
> >>> On Windows cygwin:
> >>>
> >>> $ echo $PYTHONPATH
> >>> .:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
> >>>
> >>> $ python -c "import sys ; print sys.path"
> >>> ['',
> >>>
> >>>
> >>
> '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
> >>
> >>> 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs',
> >>> 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win',
> >>> 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26',
> >>> 'c:\\Python26\\lib\\site-packages',
> >>> 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
> >>>
> >>> $
> >>>
> >>> What am I doing wrong ?
> >>>
> >>> Thanks,
> >>> Ron.
> >>>
> >>>
> >>>
> >>>
> >> In your original message, what you displayed worked exactly as
> >> expected.  As you didn't say what made you think something
> was wrong,
> >> I ignored the message.
> >>
> >> Now, you say that some modules are not found.  So how about giving
> >> some more specifics so someone can actually debug the
> problem.  Pick
> >> a particular module, tell us the complete path to that module, and
> >> show us both the sys.path strings (which look correct for
> the Windows
> >> case, and of course bogus for the cygwin case), as well as the
> >> offending import statement and its traceback.
> >>
> >> DaveA
> >>
> >
> > Hi Dave,
> >
> > My Python is the Windows Python (I need this for wxPython):
> >
> > $ ls -ls `which python`
> > 1 lrwxrwxrwx 1 rbarak mkgroup-l-d 31 Mar  4 14:02
> /usr/bin/python ->
> > /cygdrive/c/Python26/python.exe
> >
> > Here's a demo script:
> >
> > #!/usr/bin/env python
> >
> > import sys
> > print "\n",sys.path,"\n"
> >
> > from ErrorManager.ErrorManager import ErrorManager
> >
> > And it's run produces:
> >
> > $ python -u  tmp.py
> >
> > ['c:\\views\\cc_view\\TS_svm_ts_tool\\svm_ts_tool',
> >
> '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib',
> > 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs',
> > 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win',
> > 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26',
> > 'c:\\Python26\\lib\\site-packages',
> > 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
> >
> > Traceback (most recent call last):
> >   File "tmp.py", line 6, in <module>
> >     from ErrorManager.ErrorManager import ErrorManager
> > ImportError: No module named ErrorManager.ErrorManager
> >
> > $ ls -ls
> >
> /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/ErrorManager
> > /ErrorManager.py
> > 4 -rwxr-xr-x 1 rbarak ???????? 1843 Sep 21 19:16
> >
> /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/ErrorManager
> > /ErrorManager.py
> >
> > $ grep ErrorManager
> > /cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
> > ErrorManager/ErrorManager.py
> > class ErrorManager:
> >
> > $ echo $PYTHONPATH
> > .:/cygdrive/c/views/cc_view/TS_svm_ts_tool/SVMInspector/lib/
> >
> > Please let me know if the above is enough, or you'd like to
> see the results from a Windows' DOS window.
> >
> > Thanks,
> > Ron.
> >
> >
> Well, I pointed out that your cygwin path is bogus, so of
> course it won't work.  One of those entries is
>
>
> '.:\\cygdrive\\c\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib'
>
> I use Linux, and I use Windows.  But cygwin's glomming
> together has never made sense;  some things are Unix-like,
> and others are Windows-like.  So anything you do in that
> environment is beyond me.
>
> If I had to guess, though I'd say you wanted to drop those
> first two characters from your PYTHONPATH.  If you really
> wanted two directories there, you should be separating them
> with semicolon (Windows rules), rather than colon (Linux
> rules).  First thing I'd do to test my theories is to print
> something like:
>      print sys.path[1]
>      print os.listdir(sys.path[1])
> Does Python even see the cygwin view of the world ?
>
> You also don't show the location of the module you're trying
> to import.
> I'm guessing that it's at
> ...SVMInspector/lib/ErrorManager/ErrorManager.py
> Do you have a file
> ...SVMInspector/lib/ErrorManager/__init__.py     ?
>
> I would seriously recommend against naming your package, your
> module, and your class all the same thing.  Makes debugging
> very hard.  At least make them have different case combinations.
>
> DaveA
>
>

Hi Dave,
With the suggestions you made above, I managed to solve the problems I reported, and now my paths work as expected.
Thanks a lot,
Ron.

$ cat tmp.py
#!/usr/bin/env python

import sys
import os
print "sys.path:",sys.path
print "sys.path[1]:",sys.path[1]
print "os.listdir(sys.path[1]):",os.listdir(sys.path[1])

from ErrorManager.ErrorManager import ErrorManager

$ python -u tmp.py
sys.path: ['c:\\views\\cc_view\\TS_svm_ts_tool\\svm_ts_tool', 'c:\\views\\cc_view\\TS_svm_ts_tool\\SVMInspector\\lib', 'C:\\WINDOWS\\system32\\python26.zip', 'c:\\Python26\\DLLs', 'c:\\Python26\\lib', 'c:\\Python26\\lib\\plat-win', 'c:\\Python26\\lib\\lib-tk', 'c:\\Python26', 'c:\\Python26\\lib\\site-packages', 'c:\\Python26\\lib\\site-packages\\wx-2.8-msw-unicode']
sys.path[1]: c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib
os.listdir(sys.path[1]): ['ConnectivityManager', 'ErrorManager', 'Utility']

$ echo $PYTHONPATH
c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\

$ echo  $PYTHON_PATH
c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\
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From mikelisanke at gmail.com  Wed Mar 17 05:08:18 2010
From: mikelisanke at gmail.com (MikeLisanke@gmail.com)
Date: Wed, 17 Mar 2010 02:08:18 -0700 (PDT)
Subject: Python bindings tutorial
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>
	<mailman.863.1268766752.23598.python-list@python.org>
Message-ID: <98447f7e-64db-4a10-b19e-685f5b079cf6@l25g2000yqd.googlegroups.com>

On Mar 16, 3:12?pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Tue, 16 Mar 2010 13:20:40 -0300, Johny <pyt... at hope.cz> escribi?:
>
> > Is there any tutorial how to write a bindings for a exe ( dos)
> > program?
> > I would like to run it from a Python directly
> > ( using import command and a particular function from the binding)
> > ?not using os.system command.
>
> Do you mean that you want to execute a particular function in the .exe ?
> program?
> That's not possible (ok, you *could* do that if you work hard enough, but ?
> that's not how things are usually done)
>
> --
> Gabriel Genellina

Gabriel,

Its interesting you've mentioned the hard work involved in this
interface (binding to an EXE instead of a DLL). A year or more ago I
was looking at interfacing IPMITOOL to python. Do to the problems
incurred with swig/python I switched to a running the process through
its command-line interface. I always felt the problems in interfacing
python to an EXE should be worked on (to minimize them), making the
direct use of an EXE API's a routine task. I understand some of the
problems using an EXE (not running all of its startup code   but
enough for its proper operation). Have you found this a recurring
question? Thanks.

Regards, Mike


From Neil.Blue at biowisdom.com  Wed Mar 17 05:12:33 2010
From: Neil.Blue at biowisdom.com (Neil Blue)
Date: Wed, 17 Mar 2010 09:12:33 -0000
Subject: How to handle file uploads with http.server
In-Reply-To: <op.u9ov64scx6zn5v@lepton.softlabbsas.com.ar>
References: <91ad5bf81003110221m5e383f8fkc7959aa2887927eb@mail.gmail.com><4728DC0EADB2654E8BA2A487F0CF2785AD6D2E@ws-ukexchange.internal.biowisdom.com>
	<op.u9ov64scx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <4728DC0EADB2654E8BA2A487F0CF2785AD6D3E@ws-ukexchange.internal.biowisdom.com>

Thanks Gabriel

Yep, that looks like the same one. 

Cheers
Neil

 

-----Original Message-----
From: Gabriel Genellina [mailto:gagsl-py2 at yahoo.com.ar] 
Sent: 17 March 2010 02:08
To: python-list at python.org
Subject: Re: How to handle file uploads with http.server

En Thu, 11 Mar 2010 07:30:24 -0300, Neil Blue <Neil.Blue at biowisdom.com>
escribi?:

> I have a basic http.server instance running (class 
> HTTPHandler(http.server.BaseHTTPRequestHandler), with python 3.1, and 
> I would like to upload files with multipart forms.
>
> def do_POST(self):
> 	ctype, pdict = cgi.parse_header(self.headers['Content-Type'])
> 	if ctype=='multipart/form-data':
> 		print('parsing...')
> 		query=cgi.parse_multipart(self.rfile, pdict)
> 		print(query)
>
> However the file never seems to finish being parsed. There are no 
> errors, but the call hangs at: query=cgi.parse_multipart(self.rfile, 
> pdict)

This may be related to this bug:

http://bugs.python.org/issue8077

reported last week by Mitchell L. Model in this thread:

http://groups.google.com/group/comp.lang.python/t/8a7752bd79d5f5d6/

--
Gabriel Genellina



********************************************* 

The information contained in this message is likely to be confidential.  It is intended only for the person named above.  Any dissemination, distribution, copying, disclosure or use of this message or its contents unless authorised by BioWisdom Ltd is strictly prohibited. Any views or opinions expressed within this e-mail are those of the author and do not necessarily represent those of BioWisdom Ltd. If you have received this message in error, please immediately notify us and delete it.  Thank you.  Registered Office: BioWisdom Ltd, Harston Mill, Harston, Cambridge, CB22 7GG.  Registered in England: (GB) 3861669.  VAT registered: (GB) 750899881.  Tel: +44 (0)1223 874800, Fax: +44 (0) 1223 874801, Internet:www.biowisdom.com 

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From bruno.42.desthuilliers at websiteburo.invalid  Wed Mar 17 05:12:54 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 17 Mar 2010 10:12:54 +0100
Subject: to pass self or not to pass self
In-Reply-To: <4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com>
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org>
	<4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com>
Message-ID: <4ba09d09$0$21466$426a74cc@news.free.fr>

Patrick Maupin a ?crit :
> On Mar 16, 1:59 pm, Jason Tackaberry <t... at urandom.ca> wrote:
>> Why not create the bound methods at instantiation time, rather than
>> using the descriptor protocol which has the overhead of creating a new
>> bound method each time the method attribute is accessed?
> 
> Well, for one thing, Python classes are open.  They can be added to at
> any time.  For another thing, you might not ever use most of the
> methods of an instance, so it would be a huge waste to create those.

A possible optimization would be a simple memoization on first access.



From __peter__ at web.de  Wed Mar 17 05:16:17 2010
From: __peter__ at web.de (Peter Otten)
Date: Wed, 17 Mar 2010 10:16:17 +0100
Subject: Timer
References: <mailman.889.1268815865.23598.python-list@python.org>
Message-ID: <hnq6ka$gqr$00$1@news.t-online.com>

Sam Bull wrote:

> I'm writing a pyGTK program, and I need to display the contents of a
> window for a few seconds before automatically moving on. I have tried
> using the time.sleep method, but this has problems, such as the program
> becoming unresponsive.
> 
> I have now attempted to use a timer, but this does not seem to run the
> function at the end of the time. The code of my latest attempt:
> 
> def next(self=None, testnum=10, testspeed=5):
>     self.count += 1
>     #Sets label, telling the user the next word to memorise
>     self.nobtns.set_markup("Word %s is: %s" % (self.count,
> self.words[self.count-1]))
>     self.nobtns.show()
>     if self.count == testnum: #When all words are shown
>         self.nobtns.hide()
>     else:
>         self.timer = threading.Timer(testspeed, self.next, [testnum,
> testspeed])
>         self.timer.start()
> 
> Putting a print statement at the beginning of the function, I can see
> that the function is not being run by the timer. Any help on getting
> this working would be appreciated.

GUI toolkits usually have their own way of handling timeouts. I don't know 
pygtk, but the following looks promising:

http://www.pygtk.org/pygtk2tutorial/ch-TimeoutsIOAndIdleFunctions.html

Peter


From anand.shashwat at gmail.com  Wed Mar 17 05:18:06 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Wed, 17 Mar 2010 14:48:06 +0530
Subject: using DictionaryServices module to get work with python2.6 
	#OSXspecific
In-Reply-To: <hnq5gi$dal$1@dough.gmane.org>
References: <d4ab53de1003170146s7fe5e153mea5d61dd1060a19c@mail.gmail.com> 
	<hnq5gi$dal$1@dough.gmane.org>
Message-ID: <d4ab53de1003170218n139f228raa650a6b8f61de5e@mail.gmail.com>

> Are you thinking of this?
> http://pypi.python.org/pypi/pyobjc-framework-DictionaryServices/2.2
>

I get the same IndexError while working with  this wrapper. My guess is
python2.6 does not support DictionaryServices on Snow Leopard
.
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From stefan_ml at behnel.de  Wed Mar 17 05:36:29 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 17 Mar 2010 10:36:29 +0100
Subject: Python bindings tutorial
In-Reply-To: <98447f7e-64db-4a10-b19e-685f5b079cf6@l25g2000yqd.googlegroups.com>
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>	<mailman.863.1268766752.23598.python-list@python.org>
	<98447f7e-64db-4a10-b19e-685f5b079cf6@l25g2000yqd.googlegroups.com>
Message-ID: <hnq7qt$kl0$1@dough.gmane.org>

MikeLisanke at gmail.com, 17.03.2010 10:08:
> Its interesting you've mentioned the hard work involved in this
> interface (binding to an EXE instead of a DLL). A year or more ago I
> was looking at interfacing IPMITOOL to python. Do to the problems
> incurred with swig/python I switched to a running the process through
> its command-line interface. I always felt the problems in interfacing
> python to an EXE should be worked on (to minimize them), making the
> direct use of an EXE API's a routine task. I understand some of the
> problems using an EXE (not running all of its startup code   but
> enough for its proper operation). Have you found this a recurring
> question? Thanks.

I think the point here is that executable binaries are not supposed to be 
used as libraries. Libraries are. That's the difference between a DLL and 
an executable in the first place. To run an executable, execute it. The 
subprocess module is the tool of choice here. To use a DLL, link against it.

Stefan



From dr.cg at 126.com  Wed Mar 17 05:41:55 2010
From: dr.cg at 126.com (CHEN Guang)
Date: Wed, 17 Mar 2010 17:41:55 +0800 (CST)
Subject: C++ code generation
Message-ID: <24b7e9.8952.1276b803126.Coremail.dr.cg@126.com>

>> ----- Original Message -----
>> From: "Dan Goodman"<dg.gmane at thesamovar.net>
>>
>>> I'm doing some C++ code generation using Python, and would be interested
>>> in any comments on the approach I'm taking.
>>
>> PythoidC ( http://pythoidc.googlecode.com ) is a C code generator (not C++)
> 
> It would be nice if you could start reading the posts before you answer, 
> and then try to give an answer that fits the question.
> 
> Stefan
 
I have read the post, may be I lost some words and made you misunderstand. I meant:
PythoidC ( http://pythoidc.googlecode.com ) is a C code generator (but not C++), if you find it useful, 
welcome to take a look.
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From Ron.Barak at lsi.com  Wed Mar 17 06:25:58 2010
From: Ron.Barak at lsi.com (Barak, Ron)
Date: Wed, 17 Mar 2010 10:25:58 +0000
Subject: How to add a library path to pythonpath ?
In-Reply-To: <4BA01D6A.60208@gmail.com>
References: <mailman.62.1268737204.24845.python-list@python.org>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C838@enbmail01.lsi.com>
	<1fb1c371003160527q10add6bfk75c09b24bc486329@mail.gmail.com>
	<7F0503CD69378F49BE0DC30661C6CCF684F3C883@enbmail01.lsi.com>
	<4BA01D6A.60208@gmail.com>
Message-ID: <7F0503CD69378F49BE0DC30661C6CCF684F3C8FE@enbmail01.lsi.com>

 

> -----Original Message-----
> From: Mark Hammond [mailto:skippy.hammond at gmail.com] 
> Sent: Wednesday, March 17, 2010 2:08 AM
> To: Barak, Ron
> Cc: Pablo Recio Quijano; python-list at python.org
> Subject: Re: How to add a library path to pythonpath ?
> 
> On 17/03/2010 1:26 AM, Barak, Ron wrote:
> > Thanks for the suggestion Pable.
> > However, I really need the $PYTHONPATH to include this additional 
> > library, so all Python scripts could use it.
> > In Windows I have defined PYTHONPATH as 
> > c:\views\cc_view\TS_svm_ts_tool\SVMInspector\lib\, and also in the 
> > Windows registry I have 
> > 
> HKEY_LOCAL_MACHINE\SOFTWARE\Python\PythonCore\/version/\Python
> Path\ as 
> > 
> C:\Python26\Lib;C:\Python26\DLLs;C:\views\cc_view\TS_svm_ts_tool\SVMIn
> > spector\lib\;C:\Python26\Lib\lib-tk;
> > However, even with all the above, the SVMInspecor modules 
> are not found.
> 
> You need to create your own sub-key, with any name, under the 
> PythonPath key and add your path there.  The reason is that 
> Python only looks for that root key when it can't sniff the 
> location of the library itself based on the location of the 
> executable - and in most cases it can. 
> Python does however enumerate and use the sub-keys in all cases.
> 
> HTH,
> 
> Mark
> 

Hi Mark,
Could you give an example ilustrating your suggestion ?
Thanks,
Ron.

From lie.1296 at gmail.com  Wed Mar 17 06:41:50 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Wed, 17 Mar 2010 21:41:50 +1100
Subject: to pass self or not to pass self
In-Reply-To: <pan.2010.03.17.05.32.04@REMOVE.THIS.cybersource.com.au>
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>	<4b9f4984$0$10229$426a74cc@news.free.fr>	<mailman.860.1268765949.23598.python-list@python.org>	<4ba06148$1@dnews.tpgi.com.au>
	<pan.2010.03.17.05.32.04@REMOVE.THIS.cybersource.com.au>
Message-ID: <4ba0b20e$1@dnews.tpgi.com.au>

On 03/17/2010 04:32 PM, Steven D'Aprano wrote:
> On Wed, 17 Mar 2010 15:57:17 +1100, Lie Ryan wrote:
> 
>> Most people probably would never need to use
>> descriptor protocol directly, since the immediate benefit of descriptor
>> protocol are property(), classmethod(), and instancemethod() decorators
>> which, without descriptor protocol, would never become a possibility.
> 
> 
> There's an instancemethod decorator? Where?
> 
> Are you thinking of staticmethod? "instancemethod", if you mean what I 
> think you mean, doesn't need a decorator because it is the default 
> behaviour for new-style classes.

Whoops... yep, sorry about that. Got all it up the mixed head in...


From chambon.pascal at gmail.com  Wed Mar 17 06:42:44 2010
From: chambon.pascal at gmail.com (Pakal)
Date: Wed, 17 Mar 2010 03:42:44 -0700 (PDT)
Subject: Castrated traceback in sys.exc_info()
Message-ID: <7866674b-46ba-49e2-9d76-e8259ba22df0@z3g2000yqz.googlegroups.com>

Hello

I've just realized recently that sys.exc_info() didn't return a full
traceback for exception concerned : it actually only contains the
frame below the point of exception catching.

That's very annoying to me, because I planned to log such tracebacks
with logging.critical(*****, exc_info=True), and these partial
tracebacks, like the one below, are clearly unsufficient to determine
where the problem comes from. A whole traceback, from program entry
point to exception raising point, would be much better.

2010-03-17 09:28:59,184 - pims - CRITICAL - This is just a test to
ensure critical emails are properly sent
Traceback (most recent call last):
<< HERE, lots of frames missing >>
  File "test_common.py", line 34, in test_email_sending
    os.open("qsdsdqsdsdqsd", "r")
TypeError: an integer is required

Is there any workaround for this ? I've thought about a custom logging
formatter, which would take both the exc_info traceback AND its own
full backtrace, and to connect them together on their relevant part,
but it's awkward and error prone... why can't we just have all the
precious traceback info under the hand there (an additional attribute
might have pointed the precise frame in which the exception was
caught).

Tanks for the attention,
Regards,
Pascal


From davea at ieee.org  Wed Mar 17 06:55:38 2010
From: davea at ieee.org (Dave Angel)
Date: Wed, 17 Mar 2010 05:55:38 -0500
Subject: datetime string conversion error
In-Reply-To: <op.u9ow1cd4x6zn5v@lepton.softlabbsas.com.ar>
References: <8cebc349-33d5-4820-a944-2e6869408f0f@c34g2000pri.googlegroups.com>	<f1829de4-43d9-4e14-b9ea-9ee170358641@k24g2000pro.googlegroups.com>
	<op.u9ow1cd4x6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <4BA0B52A.10708@ieee.org>



Gabriel Genellina wrote:
> En Tue, 16 Mar 2010 20:31:11 -0300, Josh English 
> <joshua.r.english at gmail.com> escribi?:
>
>> On Mar 16, 11:56 am, Jordan Apgar <twistedphr... at gmail.com> wrote:
>>
>>> here's what I'm doing:
>>> date = "2010-03-16 14:46:38.409137"
>>>  olddate = datetime.strptime(date,"%Y-%m-%j %H:%M:%S.%f")
>>>
>>
>> Due to circumstances, I'm using Python 2.5.4 on one machine (2.6 on
>> the other).
>>
>> When I have a script as simple as this:
>>
>> import datetime
>>
>> datetime.datetime.strptime('2010-09-14', "%Y-%m-%d")
>>
>>
>> Running this script brings up a calendar, believe it or not. The
>> calendar displays March 2010, and shows the 22nd as a holiday. When I
>> dismiss the dialog box I get:
>> Traceback (most recent call last):
>>   File "strptimetest.py", line 3, in <module>
>>     datetime.datetime.strptime('2010-09-14', "%Y-%m-%d")
>>   File "C:\Python25\lib\_strptime.py", line 272, in <module>
>>     _TimeRE_cache = TimeRE()
>>   File "C:\Python25\lib\_strptime.py", line 191, in __init__
>>     self.locale_time = LocaleTime()
>>   File "C:\Python25\lib\_strptime.py", line 74, in __init__
>>     self.__calc_weekday()
>>   File "C:\Python25\lib\_strptime.py", line 94, in __calc_weekday
>>     a_weekday = [calendar.day_abbr[i].lower() for i in range(7)]
>> AttributeError: 'module' object has no attribute 'day_abbr'
>
> I'd say you have a calendar.py script somewhere along your sys.path, 
> that shadows the calendar module in the standard library.
>
And to find it, you could try the following:

import datetime
print calendar.__file__

I suspect you have more problems than just that file, but perhaps 
finding that one can tell you what extra package you've got installed 
that shadows parts of the standard library.  Try temporarily renaming it 
to see if the problem goes away.

DaveA



From davea at ieee.org  Wed Mar 17 07:14:13 2010
From: davea at ieee.org (Dave Angel)
Date: Wed, 17 Mar 2010 06:14:13 -0500
Subject: Python bindings tutorial
In-Reply-To: <hnq7qt$kl0$1@dough.gmane.org>
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>	<mailman.863.1268766752.23598.python-list@python.org>	<98447f7e-64db-4a10-b19e-685f5b079cf6@l25g2000yqd.googlegroups.com>
	<hnq7qt$kl0$1@dough.gmane.org>
Message-ID: <4BA0B985.3060501@ieee.org>

Stefan Behnel wrote:
> <div class="moz-text-flowed" style="font-family: 
> -moz-fixed">MikeLisanke at gmail.com, 17.03.2010 10:08:
>> Its interesting you've mentioned the hard work involved in this
>> interface (binding to an EXE instead of a DLL). A year or more ago I
>> was looking at interfacing IPMITOOL to python. Do to the problems
>> incurred with swig/python I switched to a running the process through
>> its command-line interface. I always felt the problems in interfacing
>> python to an EXE should be worked on (to minimize them), making the
>> direct use of an EXE API's a routine task. I understand some of the
>> problems using an EXE (not running all of its startup code   but
>> enough for its proper operation). Have you found this a recurring
>> question? Thanks.
>
> I think the point here is that executable binaries are not supposed to 
> be used as libraries. Libraries are. That's the difference between a 
> DLL and an executable in the first place. To run an executable, 
> execute it. The subprocess module is the tool of choice here. To use a 
> DLL, link against it.
>
> Stefan
>
There's no real reason parts of an exe cannot be exported, same as a 
dll.  They are in fact the same structure.  And in fact many other files 
in the Windows environment are also the same structure, from fonts to ocx's

Saying they're "not supposed to be used" is like saying that a python 
module should not have an

if __name__ == "__main__":

section.  After all, who could want to both run a file, and import the 
same file??

DaveA



From hatem.oraby at gmail.com  Wed Mar 17 07:26:33 2010
From: hatem.oraby at gmail.com (Hatem Oraby)
Date: Wed, 17 Mar 2010 13:26:33 +0200
Subject: Swapping Content of Two Dictionaries.
In-Reply-To: <779ea7fb1003160146t6fe79d6erc6dc12ea7452f6b3@mail.gmail.com>
References: <779ea7fb1003160146t6fe79d6erc6dc12ea7452f6b3@mail.gmail.com>
Message-ID: <779ea7fb1003170426o3dff6f06lade4b90c6a81f265@mail.gmail.com>

Hello, I want to swap the content of two dictionaries, the obvious way to do
it is:
a = {1:"I'am A"}
b = {2:"I'm B"}
temp = a
a = b
b = temp

However, consider the case in which the dictionary we are referencing lives
in another module:
#external.py
#
#a = {1:"I'am A}
import external

temp = external.a
external.a = b
b = temp

Well, still this would work great and anyone later that would refereence
external.a would find the content of b, but consider the case where someone
else imported "external.py" before my module run, for example:
#external.py
#
#a = {1:"I'm A}

#annoyer.py
#from external import a
#
# #Do other stuff with a
import external

temp = external.a
external.a = b
b = temp

Now in such case when I overwrite the content of external.a in my module,
the change in dictionary is not reflected in annoyer module, that's because
annoyer hold a reference to the original a but not the new one. annoyer
module still see the old content of a.

The workaround that i did to solve this problem is the following (I'm
simplifying it right here):

tempKeys = a.keys()
diffKeys = a.keys()  - b.keys()   #I do it using set()s

#item = a
temp = {}
for key in a.keys():
   item[key] = a[key]

for key in diffKeys:
    del a[key] #delete stuff that exist in a but not b.

for key in b.keys():
    a[key] = b[key]

b = temp

This works great as the content referenced by the dictionary is changed
rather than changing the reference of dictionary itself so it's reflected by
any "scope" that references the dictionary.

My problem is that i need to do this operation a LOT, simply I got a problem
that my program go through a very long loop and inside this loop this
operation is needed to be done twice and the dictionary size ain't very
small.

If anyone has a suggestion one how to do it faster then please feel free and
welcome to contribute.

Anyway, I decided to go and implement it in C to gain performance, And since
I got no expereince in writing C extension I'm not really sure if what I'm
doing right or wrong, long story short here is what i decided to do:
In real python (I mean not the C code) an object is mainly a reference to a
C PyObject (or an inheritance of the PyObject).
Python dictionaries are represented as PyDictObject (PyDictObject inherits
PyObject), so every Python Dictionary is a reference to PyDictObject,

So what i came up with to swap two Python dictionaries is to swap the
content of PyDictObjects of the dictionaries, I know that "illegal" way of
doing things in Python but I need the hack to gain performance.

I opened up python source files:
object.h (extracted the definition of PyObject)
dictObject.g (extctracted the definition of PyDictObject)

And I've written the following C extension:


   1. #include <Python.h>
   2. #include <dictobject.h> //I know that it was already imported
   3.
   4. static char swap_doc[] =
   5. "My try to swap dicts, isa hopefully it will work good.";
   6.
   7.
   8. static PyObject*
   9. swap_swapDict(PyObject *self, PyObject *args)
   10. {
   11.         PyObject *a, *b;
   12.         PyDictObject *x, *y;
   13.         //Temp PyDictObject attriubutes
   14.         Py_ssize_t ob_refcnt;
   15.         PyTypeObject *ob_type;
   16.         Py_ssize_t ma_fill;
   17.         Py_ssize_t ma_used;
   18.         Py_ssize_t ma_mask;
   19.         PyDictEntry *ma_table;
   20.         PyDictEntry *(*ma_lookup)(PyDictObject *mp, PyObject *key,
   long hash);
   21.         PyDictEntry *ma_smalltable;//[PyDict_MINSIZE];
   22.
   23.
   24.         if (!PyArg_UnpackTuple(args, "swapDict", 2, 2, &a, &b)) {
   25.                 return NULL;
   26.         }
   27.
   28.         //Make sure that they are dictionaries
   29.         if (!PyDict_Check(a) && !PyDict_Check(b)) {
   30.                 PyErr_SetString(PyExc_TypeError,
   31.                                 "dictionary required, something else
   was passed");
   32.                 return NULL;
   33.         }
   34.
   35.         x = (PyDictObject*)a;
   36.         y = (PyDictObject*)b;
   37.
   38.         ob_refcnt = x->ob_refcnt;
   39.         x->ob_refcnt = y->ob_refcnt;
   40.         y->ob_refcnt = ob_refcnt;
   41.
   42.         ob_type = x->ob_type;
   43.         x->ob_type = y->ob_type;
   44.         y->ob_type = ob_type;
   45.
   46.         ma_fill = x->ma_fill;
   47.         x->ma_fill = y->ma_fill;
   48.         y->ma_fill = ma_fill;
   49.
   50.         ma_used = x->ma_used;
   51.         x->ma_used = y->ma_used;
   52.         y->ma_used = ma_used;
   53.
   54.         ma_mask = x->ma_mask;
   55.         x->ma_mask = y->ma_mask;
   56.         y->ma_mask = ma_mask;
   57.
   58.         ma_table = x->ma_table;
   59.         x->ma_table = y->ma_table;
   60.         y->ma_table = ma_table;
   61.
   62.         ma_lookup = x-> ma_lookup;
   63.         x->ma_lookup = y-> ma_lookup;
   64.         y->ma_lookup = ma_lookup;
   65.
   66.         ma_smalltable = x->ma_smalltable;
   67.         *(x->ma_smalltable) = *(y->ma_smalltable);
   68.         *(y->ma_smalltable) = *(ma_smalltable);
   69.
   70.         return Py_None;
   71. }
   72.
   73. //This is extracted form dictObject.h and object.h
   74. //typedef struct _dictobject PyDictObject;
   75. //struct _dictobject {
   76. //      PyObject_HEAD
   77. //      Py_ssize_t ma_fill;  /* # Active + # Dummy */
   78. //      Py_ssize_t ma_used;  /* # Active */
   79. //
   80. //      /* The table contains ma_mask + 1 slots, and that's a power
   of 2.
   81. //       * We store the mask instead of the size because the mask is
   more
   82. //       * frequently needed.
   83. //       */
   84. //      Py_ssize_t ma_mask;
   85. //
   86. //      /* ma_table points to ma_smalltable for small tables, else to
   87. //       * additional malloc'ed memory.  ma_table is never NULL!
   This rule
   88. //       * saves repeated runtime null-tests in the workhorse getitem
   and
   89. //       * setitem calls.
   90. //       */
   91. //      PyDictEntry *ma_table;
   92. //      PyDictEntry *(*ma_lookup)(PyDictObject *mp, PyObject *key,
   long hash);
   93. //      PyDictEntry ma_smalltable[PyDict_MINSIZE];
   94. //};
   95. //PyObject_Head is a simple two statements equal to:
   96. //Py_ssize_t ob_refcnt;
   97. //struct _typeobject *ob_type;
   98.
   99. static char swap_swapDict_doc[] =
   100. "Replaces two dicts with each other.";
   101.
   102. static PyMethodDef swap_methods[] = {
   103.         {"swapDict", swap_swapDict, METH_VARARGS, swap_swapDict_doc}
   ,
   104.         {NULL, NULL}
   105. };
   106.
   107. PyMODINIT_FUNC
   108. initswap(void)
   109. {
   110.         Py_InitModule3("swap", swap_methods, swap_doc);
   111. }



What the code mainly do is that it swap the content of the PyDict objects.
However I got a bug where one of them swaps correctly while the other points
to a displaced memory location.
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From michael.ricordeau at gmail.com  Wed Mar 17 07:40:19 2010
From: michael.ricordeau at gmail.com (Michael Ricordeau)
Date: Wed, 17 Mar 2010 12:40:19 +0100
Subject: Castrated traceback in sys.exc_info()
In-Reply-To: <7866674b-46ba-49e2-9d76-e8259ba22df0@z3g2000yqz.googlegroups.com>
References: <7866674b-46ba-49e2-9d76-e8259ba22df0@z3g2000yqz.googlegroups.com>
Message-ID: <20100317124019.7013dfa3@moriz.interne>

Hi,

to log tracebacks, you can probably try traceback module.

I use it like this :

import traceback
.... #?your code

for line in traceback.format_exc().splitlines():
  log.trace(line)



Le Wed, 17 Mar 2010 03:42:44 -0700 (PDT),
Pakal <chambon.pascal at gmail.com> a ?crit :

> Hello
> 
> I've just realized recently that sys.exc_info() didn't return a full
> traceback for exception concerned : it actually only contains the
> frame below the point of exception catching.
> 
> That's very annoying to me, because I planned to log such tracebacks
> with logging.critical(*****, exc_info=True), and these partial
> tracebacks, like the one below, are clearly unsufficient to determine
> where the problem comes from. A whole traceback, from program entry
> point to exception raising point, would be much better.
> 
> 2010-03-17 09:28:59,184 - pims - CRITICAL - This is just a test to
> ensure critical emails are properly sent
> Traceback (most recent call last):
> << HERE, lots of frames missing >>
>   File "test_common.py", line 34, in test_email_sending
>     os.open("qsdsdqsdsdqsd", "r")
> TypeError: an integer is required
> 
> Is there any workaround for this ? I've thought about a custom logging
> formatter, which would take both the exc_info traceback AND its own
> full backtrace, and to connect them together on their relevant part,
> but it's awkward and error prone... why can't we just have all the
> precious traceback info under the hand there (an additional attribute
> might have pointed the precise frame in which the exception was
> caught).
> 
> Tanks for the attention,
> Regards,
> Pascal


From alfps at start.no  Wed Mar 17 08:03:06 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 17 Mar 2010 13:03:06 +0100
Subject: Python bindings tutorial
In-Reply-To: <mailman.898.1268824466.23598.python-list@python.org>
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>	<mailman.863.1268766752.23598.python-list@python.org>	<98447f7e-64db-4a10-b19e-685f5b079cf6@l25g2000yqd.googlegroups.com>	<hnq7qt$kl0$1@dough.gmane.org>
	<mailman.898.1268824466.23598.python-list@python.org>
Message-ID: <hnqgdr$prr$1@news.eternal-september.org>

* Dave Angel:
> Stefan Behnel wrote:
>> <div class="moz-text-flowed" style="font-family: 
>> -moz-fixed">MikeLisanke at gmail.com, 17.03.2010 10:08:
>>> Its interesting you've mentioned the hard work involved in this
>>> interface (binding to an EXE instead of a DLL). A year or more ago I
>>> was looking at interfacing IPMITOOL to python. Do to the problems
>>> incurred with swig/python I switched to a running the process through
>>> its command-line interface. I always felt the problems in interfacing
>>> python to an EXE should be worked on (to minimize them), making the
>>> direct use of an EXE API's a routine task. I understand some of the
>>> problems using an EXE (not running all of its startup code   but
>>> enough for its proper operation). Have you found this a recurring
>>> question? Thanks.
>>
>> I think the point here is that executable binaries are not supposed to 
>> be used as libraries. Libraries are. That's the difference between a 
>> DLL and an executable in the first place. To run an executable, 
>> execute it. The subprocess module is the tool of choice here. To use a 
>> DLL, link against it.
>>
>> Stefan
>>
> There's no real reason parts of an exe cannot be exported, same as a 
> dll.  They are in fact the same structure.  And in fact many other files 
> in the Windows environment are also the same structure, from fonts to ocx's
> 
> Saying they're "not supposed to be used" is like saying that a python 
> module should not have an
> 
> if __name__ == "__main__":
> 
> section.  After all, who could want to both run a file, and import the 
> same file??

A Windows DLL has defined initialization and cleanup per process and per thread.

This means that e.g. static variables can be properly initialized when you load 
the DLL in order to use its functions (I'm skipping discussion of subtle 
problems, but that's the essence).

A Windows EXE has (only) a single entry point which is for process startup. It 
invokes the EXE's behavior-as-a-program. There is no way to use it to e.g. 
initialize static variables in order to use exported functions.

Hence Mike Lisanke's idea of "not running all of its startup code but enough for 
its proper operation" is generally not possible.

An EXE can be used as a kind of server, /if/ it is designed for that. In 
particular it can be a COM server, allowing access of its functionality from any 
COM-enabled binding, which for Python would mean OLE Automation (COM, OLE, 
Automation: this is Microsoft technology, we're talking Windows EXEs here). But 
a Python binding to EXEs in general can't, as far as I can see, make assumptions 
about any particular kind of server being implemented by the EXE.


Cheers & hth.,

- Alf


From stefan_ml at behnel.de  Wed Mar 17 08:18:33 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 17 Mar 2010 13:18:33 +0100
Subject: Python bindings tutorial
In-Reply-To: <4BA0B985.3060501@ieee.org>
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>	<mailman.863.1268766752.23598.python-list@python.org>	<98447f7e-64db-4a10-b19e-685f5b079cf6@l25g2000yqd.googlegroups.com>	<hnq7qt$kl0$1@dough.gmane.org>
	<4BA0B985.3060501@ieee.org>
Message-ID: <hnqhao$o9m$1@dough.gmane.org>

Dave Angel, 17.03.2010 12:14:
> Stefan Behnel wrote:
>> I think the point here is that executable binaries are not supposed to
>> be used as libraries. Libraries are. That's the difference between a
>> DLL and an executable in the first place. To run an executable,
>> execute it. The subprocess module is the tool of choice here. To use a
>> DLL, link against it.
>>
> There's no real reason parts of an exe cannot be exported, same as a
> dll. They are in fact the same structure. And in fact many other files
> in the Windows environment are also the same structure, from fonts to ocx's

So, because you can, you'd also try to link against fonts then, I guess?

I hope you notice that what you and me said isn't contradictory. But 
there's a reason why there are libraries and executables, and there's no 
reason you *should* export anything from an executable - that's what 
libraries are there for. That's my point.

Besides, nothing guarantees that it's safe to call stuff that an executable 
exports. The executable may well require some setup code that it only 
executes when it is properly started.

Stefan



From rps at haystack.mit.edu  Wed Mar 17 08:24:03 2010
From: rps at haystack.mit.edu (robert schaefer)
Date: Wed, 17 Mar 2010 08:24:03 -0400
Subject: question about tkinter
Message-ID: <54C3DEE7-50FE-46D8-B1EA-E2C54E11817F@haystack.mit.edu>

Hello,

 This is my first posting to this list so please be gentle - 

 I am new to python and am using it on red-hat linux (I am new to that too).
 I am responsible for installing open source packages (including python) onto a distributed system of linux boxes.

 My question is, on python version 2.6.2 tkinter refuses to install.
 Without tkinter, I cannot use Idle.

 I looked at the install/configure script and hacked it a bit, but every fix only caused new problems.
 There are serious issues with that script for  finding necessary libraries.

We have a Sun-OS box with python version 2.5.x (I don't know the means of installation) that
tkinter installed correctly, and Idle works fine.

 My question is - has anyone else noticed the problem of tkinter and red-hat linux?  
Has this been corrected in python 2.6.4 (or 2.6.5)?

thanks,
  bob s.


-----------------------------------
robert schaefer
Atmospheric Sciences Group
MIT Haystack Observatory
Westford, MA 01886

email:  rps at haystack.mit.edu
voice:  781-981-5767
www:  http://www.haystack.mit.edu



From __peter__ at web.de  Wed Mar 17 08:34:51 2010
From: __peter__ at web.de (Peter Otten)
Date: Wed, 17 Mar 2010 13:34:51 +0100
Subject: Swapping Content of Two Dictionaries.
References: <779ea7fb1003160146t6fe79d6erc6dc12ea7452f6b3@mail.gmail.com>
	<779ea7fb1003170426o3dff6f06lade4b90c6a81f265@mail.gmail.com>
Message-ID: <hnqi8k$s8t$1@dough.gmane.org>

Hatem Oraby wrote:

> Hello, I want to swap the content of two dictionaries, the obvious way to
> do it is:
> a = {1:"I'am A"}
> b = {2:"I'm B"}
> temp = a
> a = b
> b = temp

That can be simplified to

a, b = b, a

and is almost certainly the right approach.

> tempKeys = a.keys()
> diffKeys = a.keys()  - b.keys()   #I do it using set()s
> 
> #item = a
> temp = {}
> for key in a.keys():
>    item[key] = a[key]
> 
> for key in diffKeys:
>     del a[key] #delete stuff that exist in a but not b.
> 
> for key in b.keys():
>     a[key] = b[key]
> 
> b = temp
> 
> This works great as the content referenced by the dictionary is changed
> rather than changing the reference of dictionary itself so it's reflected
> by any "scope" that references the dictionary.
> 
> My problem is that i need to do this operation a LOT, simply I got a
> problem that my program go through a very long loop and inside this loop
> this operation is needed to be done twice and the dictionary size ain't
> very small.

You could try

>>> a = {"a": 1, "b": 2}
>>> b = {"b": 3, "c": 4}
>>> t = a.copy()
>>> a.clear()
>>> a.update(b)
>>> b.clear()
>>> b.update(t)
>>> a
{'c': 4, 'b': 3}
>>> b
{'a': 1, 'b': 2}

> If anyone has a suggestion one how to do it faster then please feel free
> and welcome to contribute.

> Anyway, I decided to go and implement it in C to gain performance, And

Premature optimization? If you explain what you are trying to achieve 
someone might come up with a way to do it without swapping dict contents.

Peter




From chambon.pascal at gmail.com  Wed Mar 17 08:42:06 2010
From: chambon.pascal at gmail.com (Pascal Chambon)
Date: Wed, 17 Mar 2010 13:42:06 +0100
Subject: Castrated traceback in sys.exc_info()
In-Reply-To: <20100317124019.7013dfa3@moriz.interne>
References: <7866674b-46ba-49e2-9d76-e8259ba22df0@z3g2000yqz.googlegroups.com>
	<20100317124019.7013dfa3@moriz.interne>
Message-ID: <9fd96c3b1003170542t4ea864c6y359107cb747536da@mail.gmail.com>

Hello,

traceback functions indeed allow the manipulation of exception tracebacks,
but the root problem is that anyway, since that traceback is incomplete,
your "traceback.format_exc().splitlines()" will only provide frames for
callee (downward) functions, not caller (upward) ones, starting from the
exception catching frame.

Regards,
Pascal



2010/3/17 Michael Ricordeau <michael.ricordeau at gmail.com>

> Hi,
>
> to log tracebacks, you can probably try traceback module.
>
> I use it like this :
>
> import traceback
> .... # your code
>
> for line in traceback.format_exc().splitlines():
>  log.trace(line)
>
>
>
> Le Wed, 17 Mar 2010 03:42:44 -0700 (PDT),
> Pakal <chambon.pascal at gmail.com> a ?crit :
>
> > Hello
> >
> > I've just realized recently that sys.exc_info() didn't return a full
> > traceback for exception concerned : it actually only contains the
> > frame below the point of exception catching.
> >
> > That's very annoying to me, because I planned to log such tracebacks
> > with logging.critical(*****, exc_info=True), and these partial
> > tracebacks, like the one below, are clearly unsufficient to determine
> > where the problem comes from. A whole traceback, from program entry
> > point to exception raising point, would be much better.
> >
> > 2010-03-17 09:28:59,184 - pims - CRITICAL - This is just a test to
> > ensure critical emails are properly sent
> > Traceback (most recent call last):
> > << HERE, lots of frames missing >>
> >   File "test_common.py", line 34, in test_email_sending
> >     os.open("qsdsdqsdsdqsd", "r")
> > TypeError: an integer is required
> >
> > Is there any workaround for this ? I've thought about a custom logging
> > formatter, which would take both the exc_info traceback AND its own
> > full backtrace, and to connect them together on their relevant part,
> > but it's awkward and error prone... why can't we just have all the
> > precious traceback info under the hand there (an additional attribute
> > might have pointed the precise frame in which the exception was
> > caught).
> >
> > Tanks for the attention,
> > Regards,
> > Pascal
>
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From __peter__ at web.de  Wed Mar 17 09:00:32 2010
From: __peter__ at web.de (Peter Otten)
Date: Wed, 17 Mar 2010 14:00:32 +0100
Subject: question about tkinter
References: <mailman.903.1268829586.23598.python-list@python.org>
Message-ID: <hnqjoo$g4o$02$1@news.t-online.com>

robert schaefer wrote:

>  This is my first posting to this list so please be gentle -
> 
>  I am new to python and am using it on red-hat linux (I am new to that
>  too). I am responsible for installing open source packages (including
>  python) onto a distributed system of linux boxes.
> 
>  My question is, on python version 2.6.2 tkinter refuses to install.

Does it say "I'm sorry Bob, I'm afraid I can't do this"?

>  Without tkinter, I cannot use Idle.
> 
>  I looked at the install/configure script and hacked it a bit, but every
>  fix only caused new problems.
>  There are serious issues with that script for  finding necessary
>  libraries.

If there are serious problems you have to give some details.

However, if in the past a newbie had problems with Tkinter support on linux 
the most frequent problem was that the Tcl/Tk development libraries weren't 
installed. I don't know how those are called on Red Hat, maybe something 
like

tcl*-dev.rpm

Did you install these before running the configure script?

Peter


From lie.1296 at gmail.com  Wed Mar 17 09:16:53 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Thu, 18 Mar 2010 00:16:53 +1100
Subject: to pass self or not to pass self
In-Reply-To: <4ba09d09$0$21466$426a74cc@news.free.fr>
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org>
	<4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com>
	<4ba09d09$0$21466$426a74cc@news.free.fr>
Message-ID: <4ba0d65f$1@dnews.tpgi.com.au>

On 03/17/2010 08:12 PM, Bruno Desthuilliers wrote:
> Patrick Maupin a ?crit :
>> On Mar 16, 1:59 pm, Jason Tackaberry <t... at urandom.ca> wrote:
>>> Why not create the bound methods at instantiation time, rather than
>>> using the descriptor protocol which has the overhead of creating a new
>>> bound method each time the method attribute is accessed?
>>
>> Well, for one thing, Python classes are open.  They can be added to at
>> any time.  For another thing, you might not ever use most of the
>> methods of an instance, so it would be a huge waste to create those.
> 
> A possible optimization would be a simple memoization on first access.

But what if, for example, one uses some descriptor/metaclass magic to
make it so that each subsequent access to the attribute returns a method
bound to different objects?


From h.stenstrom at gmail.com  Wed Mar 17 09:20:42 2010
From: h.stenstrom at gmail.com (=?ISO-8859-1?Q?Helge_Stenstr=F6m?=)
Date: Wed, 17 Mar 2010 06:20:42 -0700 (PDT)
Subject: Function that knows its argument's variable name
References: <47e725b6-1470-4563-a64b-02630032ef36@g26g2000yqn.googlegroups.com>
	<80ai5hFh3uU1@mid.individual.net>
Message-ID: <02eb7ec7-1e22-43a4-8019-9a154c734669@y17g2000yqd.googlegroups.com>

Thank you to all who answered. Inspection is apparently possible, but
too complex for me.
Greg's solution does what I want, inserting "" is no problem.

/Helge


> Not exactly, but you can come close with a little hackery.
>
> import sys
>
> def print_var(name):
> ? ?print name, "=", sys._getframe(1).f_locals[name]
>
> def f():
> ? ?fred = 42
> ? ?mary = "christmas"
> ? ?print_var("fred")
> ? ?print_var("mary")
>
> f()
>
> --
> Greg



From python at bdurham.com  Wed Mar 17 09:22:37 2010
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 17 Mar 2010 09:22:37 -0400
Subject: Web Hosting Python 3
In-Reply-To: <0016e64642280288940481f66d5e@google.com>
References: <0016e64642280288940481f66d5e@google.com>
Message-ID: <1268832157.6206.1365286517@webmail.messagingengine.com>

Hidura,

> Hello list, i am in a project what need hosting, who give
hosting to python3?

Check out www.webfaction.com. I'm extremely pleased with this
vendor.

Highly recommended!

Malcolm
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From vinay_sajip at yahoo.co.uk  Wed Mar 17 09:24:43 2010
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Wed, 17 Mar 2010 06:24:43 -0700 (PDT)
Subject: Castrated traceback in sys.exc_info()
References: <7866674b-46ba-49e2-9d76-e8259ba22df0@z3g2000yqz.googlegroups.com>
Message-ID: <95063943-4a45-42f5-81a2-761cf48daaa8@d27g2000yqf.googlegroups.com>

On Mar 17, 10:42?am, Pakal <chambon.pas... at gmail.com> wrote:
> Hello
>
> I've just realized recently that sys.exc_info() didn't return a full
> traceback for exception concerned : it actually only contains the
> frame below the point of exception catching.
>
> That's very annoying to me, because I planned to log such tracebacks
> withlogging.critical(*****, exc_info=True), and these partial
> tracebacks, like the one below, are clearly unsufficient to determine
> where the problem comes from. A whole traceback, from program entry
> point to exception raising point, would be much better.
>
> 2010-03-17 09:28:59,184 - pims - CRITICAL - This is just a test to
> ensure critical emails are properly sent
> Traceback (most recent call last):
> << HERE, lots of frames missing >>
> ? File "test_common.py", line 34, in test_email_sending
> ? ? os.open("qsdsdqsdsdqsd", "r")
> TypeError: an integer is required
>
> Is there any workaround for this ? I've thought about a customlogging
> formatter, which would take both the exc_info traceback AND its own
> full backtrace, and to connect them together on their relevant part,
> but it's awkward and error prone... why can't we just have all the
> precious traceback info under the hand there (an additional attribute
> might have pointed the precise frame in which the exception was
> caught).
>
> Tanks for the attention,
> Regards,
> Pascal

Do you have a short script which demonstrates the problem? Some more
context is needed. For example, if you have multiple threads of
execution, the traceback will only go up to the top-level function in
the thread.

Regards,

Vinay Sajip


From a_jtim at bellsouth.net  Wed Mar 17 09:30:24 2010
From: a_jtim at bellsouth.net (Tim Arnold)
Date: Wed, 17 Mar 2010 06:30:24 -0700 (PDT)
Subject: multiprocessing on freebsd
Message-ID: <f1121800-f416-4455-b223-dfa562edb853@t23g2000yqt.googlegroups.com>

Hi,
I'm checking to see if multiprocessing works on freebsd for any
version of python. My server is about to get upgraded from 6.3 to 8.0
and I'd sure like to be able to use multiprocessing.

I think the minimal test would be:
---------------------
import multiprocessing
q = multiprocessing.Queue()
---------------------

with 6.3, I get

 File "/usr/local/lib/python2.6/multiprocessing/__init__.py", line
212, in Queue
    from multiprocessing.queues import Queue
  File "/usr/local/lib/python2.6/multiprocessing/queues.py", line 22,
in <module>
    from multiprocessing.synchronize import Lock, BoundedSemaphore,
Semaphore, Condition
  File "/usr/local/lib/python2.6/multiprocessing/synchronize.py", line
33, in <module>
    " function, see issue 3770.")
ImportError: This platform lacks a functioning sem_open
implementation, therefore, the required synchronization primitives
needed will not function, see issue 3770.


thanks for any info,
--Tim Arnold


From rps at haystack.mit.edu  Wed Mar 17 09:32:46 2010
From: rps at haystack.mit.edu (robert schaefer)
Date: Wed, 17 Mar 2010 09:32:46 -0400
Subject: question about tkinter
In-Reply-To: <hnqjoo$g4o$02$1@news.t-online.com>
References: <mailman.903.1268829586.23598.python-list@python.org>
	<hnqjoo$g4o$02$1@news.t-online.com>
Message-ID: <8C160E0A-D35A-4EA8-822B-8CB5BCD9C529@haystack.mit.edu>


Peter,

Most of my life has been dealing with recalcitrant HAL's in one guise or another.  
These days, I think HAL has permanently taken up residence in Toyota's engine and brakes.
"Stop the car Dave? Have you changed my oil or even washed me lately?"
Some serious "sneak paths" are going on.

Anyway -

tkinter is in two parts:
  1. a python wrapper 
  2. c code

Both are present in the 2.6.2 python download.
It appears to be a "I can't find the library" path problem not a file existence problem.

1. gcc can't find the libraries that tkinter c code links to ( I could fix that)
2. the python installer can't find all the library paths to all the pieces
    - I started fixing this, then determined it would be easier to rewrite from scratch than patch.
      That is, the given method of building paths in the script are way off from reality, not just an
      add this one path and everything will now work kind of magic.
      I felt that the "official" python people would have an easier time of this - so gave up.

bob

On Mar 17, 2010, at 9:00 AM, Peter Otten wrote:

> robert schaefer wrote:
> 
>> This is my first posting to this list so please be gentle -
>> 
>> I am new to python and am using it on red-hat linux (I am new to that
>> too). I am responsible for installing open source packages (including
>> python) onto a distributed system of linux boxes.
>> 
>> My question is, on python version 2.6.2 tkinter refuses to install.
> 
> Does it say "I'm sorry Bob, I'm afraid I can't do this"?
> 
>> Without tkinter, I cannot use Idle.
>> 
>> I looked at the install/configure script and hacked it a bit, but every
>> fix only caused new problems.
>> There are serious issues with that script for  finding necessary
>> libraries.
> 
> If there are serious problems you have to give some details.
> 
> However, if in the past a newbie had problems with Tkinter support on linux 
> the most frequent problem was that the Tcl/Tk development libraries weren't 
> installed. I don't know how those are called on Red Hat, maybe something 
> like
> 
> tcl*-dev.rpm
> 
> Did you install these before running the configure script?
> 
> Peter
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 
> !DSPAM:4ba0d3cd3229021468!
> 

-----------------------------------
robert schaefer
Atmospheric Sciences Group
MIT Haystack Observatory
Westford, MA 01886

email:  rps at haystack.mit.edu
voice:  781-981-5767
www:  http://www.haystack.mit.edu



From hidura at gmail.com  Wed Mar 17 09:39:21 2010
From: hidura at gmail.com (Hidura)
Date: Wed, 17 Mar 2010 09:39:21 -0400
Subject: Web Hosting Python 3
In-Reply-To: <1268832157.6206.1365286517@webmail.messagingengine.com>
References: <0016e64642280288940481f66d5e@google.com>
	<1268832157.6206.1365286517@webmail.messagingengine.com>
Message-ID: <4bbf7fb21003170639j1fe53d3fr17524681085b36a0@mail.gmail.com>

I've saw last night in the help area they support Python3.1, thanks anyway

On Wed, Mar 17, 2010 at 9:22 AM, <python at bdurham.com> wrote:

>  Hidura,
>
> > Hello list, i am in a project what need hosting, who give hosting to
> python3?
>
> Check out www.webfaction.com. I'm extremely pleased with this vendor.
>
> Highly recommended!
>
> Malcolm
>



-- 
Hidura
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From ashwiniyal at gmail.com  Wed Mar 17 09:54:18 2010
From: ashwiniyal at gmail.com (ashwini yal)
Date: Wed, 17 Mar 2010 19:24:18 +0530
Subject: Special characters (^M & ^[[D) when I read pxssh::before and write it
	to a file
Message-ID: <771960b21003170654u1f6bac7bm1c0d7b30e2187f1f@mail.gmail.com>

Hi,

I am writing a python script which logs into the machine using pxssh, sends
a command, reads the response and writes the response to the file.

But, when I open the file in the editor like vi, its showing special
characters like ^M and ^[[D instead of spaces or newlines.

This is how my code looks like ...

s = pxssh.pxssh()
s.login(ip, username, password)

cmd = 'xyz'
s.sendline (cmd)
s.prompt()
output = s.before
fileWrite = open(filePath , 'wb')
fileWrite.write(output)
s.prompt()


This is how my filePath looks like when I open it using vi editor.

Starting command execution on host xxx.xxx.xxx.xxx

D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^M

Command executed successfully ^M

Executing next command ...^M

-- 
Regards ,
Ashwini . K
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From __peter__ at web.de  Wed Mar 17 09:59:40 2010
From: __peter__ at web.de (Peter Otten)
Date: Wed, 17 Mar 2010 14:59:40 +0100
Subject: question about tkinter
References: <mailman.903.1268829586.23598.python-list@python.org>
	<hnqjoo$g4o$02$1@news.t-online.com>
	<mailman.906.1268832771.23598.python-list@python.org>
Message-ID: <hnqn7l$645$03$1@news.t-online.com>

robert schaefer wrote:

> tkinter is in two parts:
> 1. a python wrapper
> 2. c code
> 
> Both are present in the 2.6.2 python download.
> It appears to be a "I can't find the library" path problem not a file
> existence problem.
> 
> 1. gcc can't find the libraries that tkinter c code links to ( I could fix
> that) 2. the python installer can't find all the library paths to all the
> pieces - I started fixing this, then determined it would be easier to
> rewrite from scratch than patch. That is, the given method of building
> paths in the script are way off from reality, not just an add this one
> path and everything will now work kind of magic. I felt that the
> "official" python people would have an easier time of this - so gave up.

Just to exclude the simple problems (unfortunately I can't help you with the 
hard ones): Are the tcl development packages installed on your system?

Peter 



From stefan_ml at behnel.de  Wed Mar 17 10:10:27 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 17 Mar 2010 15:10:27 +0100
Subject: Swapping Content of Two Dictionaries.
In-Reply-To: <779ea7fb1003170426o3dff6f06lade4b90c6a81f265@mail.gmail.com>
References: <779ea7fb1003160146t6fe79d6erc6dc12ea7452f6b3@mail.gmail.com>
	<779ea7fb1003170426o3dff6f06lade4b90c6a81f265@mail.gmail.com>
Message-ID: <hnqnsj$jdi$1@dough.gmane.org>

Hatem Oraby, 17.03.2010 12:26:
> However, consider the case in which the dictionary we are referencing lives
> in another module:
> #external.py
> #
> #a = {1:"I'am A}
> import external
>
> temp = external.a
> external.a = b
> b = temp

Looks like the interface of your module is broken. It shouldn't export the 
two dicts.


> My problem is that i need to do this operation a LOT, simply I got a problem
> that my program go through a very long loop and inside this loop this
> operation is needed to be done twice and the dictionary size ain't very
> small.

Please explain what you use the dicts for and how they are supposed to be 
used by your own code and by external code. That will allow us to give an 
advice on how to design your module better.

Stefan



From pruebauno at latinmail.com  Wed Mar 17 10:29:31 2010
From: pruebauno at latinmail.com (nn)
Date: Wed, 17 Mar 2010 07:29:31 -0700 (PDT)
Subject: Searching for most pythonic/least stupid way to do something 
	simple
References: <d62c4091-e0f0-4195-9b0e-dd597f9d0131@u9g2000yqb.googlegroups.com>
	<7xmxy87172.fsf@ruckus.brouhaha.com>
	<2c39f6d4-3118-43f3-907d-57f733dc7ed8@d27g2000yqf.googlegroups.com>
	<288bfc27-0c5b-4601-9ceb-dd2614593fb9@m37g2000yqf.googlegroups.com> 
	<mailman.862.1268766468.23598.python-list@python.org>
Message-ID: <40341e67-0609-4da7-b32e-afdf3ea5b6cc@d27g2000yqf.googlegroups.com>



Michael Torrie wrote:
> david jensen wrote:
> > of course, changing nn's to:
> > def getOutcomes(myList=[2,5,8,3,5]):
> >    low_id = int(myList[0]>myList[1])
> >    amountToShare = 2*myList[low_id]
> >    remainder = myList[not low_id]-myList[low_id]
> >    tail=list(myList[2:])
> >    outcomes = [[amountToShare*perc, remainder+amountToShare*(1-perc)]+
> > tail for perc in (1.0, 0.75, 0.5, 0.25, 0.0)] if not low_id else
> > [[remainder+amountToShare*perc, amountToShare*(1-perc)]+ tail for perc
> > in (1.0, 0.75, 0.5, 0.25, 0.0)]
> >    return outcomes
> >
> >
> > works, just hides the ugliness in a more compact form
>
> If Gerard's code works, I would consider it far superior to your code
> here.  Pythonic does not necessarily mean short and ugly, nor does it
> mean that you have to always use list comprehensions.   Having a
> readable algorithm that's easy to follow in the future is a far better
> way than trying to use python's cool features to compact the code to as
> small and unreadable section as possible.
>
> I used to use list comprehension all the time, but I've found that often
> an explicit for loop is a much better solution in terms of
> maintainability.  Especially when you start seeing nested comprehensions
> such as you have here.

To be fair, that list comprehension was unnecessary complicated. The
following version does the same thing and still looks pretty
reasonable IMHO:

def getOutcomes(myList=[2,5,8,3,5]):
   low_id = int(myList[0]>myList[1])
   high_id = not low_id
   smaller = myList[low_id]
   bigger = myList[high_id]
   amountToShare = 2*smaller
   remainder = bigger-smaller
   remain0 = low_id*remainder
   remain1 = high_id*remainder
   tail = list(myList[2:])
   percents = (1.0, 0.75, 0.5, 0.25, 0.0)
   outcomes = [[remain0+amountToShare*perc, remain1+amountToShare*(1-
perc)]
               +tail for perc in percents]
   return outcomes


From rps at haystack.mit.edu  Wed Mar 17 10:33:41 2010
From: rps at haystack.mit.edu (robert schaefer)
Date: Wed, 17 Mar 2010 10:33:41 -0400
Subject: question about tkinter
In-Reply-To: <hnqn7l$645$03$1@news.t-online.com>
References: <mailman.903.1268829586.23598.python-list@python.org>
	<hnqjoo$g4o$02$1@news.t-online.com>
	<mailman.906.1268832771.23598.python-list@python.org>
	<hnqn7l$645$03$1@news.t-online.com>
Message-ID: <CD942CDF-0D69-421E-8047-6EDFC7274873@haystack.mit.edu>

No, And there's a reason (perhaps not a great one - but I'm got some constraints).

I am not the system administrator and the tcl installer wants to be 
installed as root. I tried it. 

The rationale for not doing this is that the installation packages that I am administrator for,
 are all installed in non-root directories. by non-root people. 
 If I have to install any package as root, then that becomes
 "different". The machines are all linux and intended to be swappable/exchangeable and installed by
 anyone without root access. This simplifies maintenance when a large number of boxes are involved.

Are there any tcl/tk packages that permit re-direction of installation to non-root directories?

This problem is just an ongoing irritation, python works fine without tkinter, I just can't get idle
 to work without it.  

 Related to that I tailored Ipython to work with gtk (ipython's default was tkinter) - tailoring was by a command
- is there any way to command idle to use gtk?


On Mar 17, 2010, at 9:59 AM, Peter Otten wrote:

> robert schaefer wrote:
> 
>> tkinter is in two parts:
>> 1. a python wrapper
>> 2. c code
>> 
>> Both are present in the 2.6.2 python download.
>> It appears to be a "I can't find the library" path problem not a file
>> existence problem.
>> 
>> 1. gcc can't find the libraries that tkinter c code links to ( I could fix
>> that) 2. the python installer can't find all the library paths to all the
>> pieces - I started fixing this, then determined it would be easier to
>> rewrite from scratch than patch. That is, the given method of building
>> paths in the script are way off from reality, not just an add this one
>> path and everything will now work kind of magic. I felt that the
>> "official" python people would have an easier time of this - so gave up.
> 
> Just to exclude the simple problems (unfortunately I can't help you with the 
> hard ones): Are the tcl development packages installed on your system?
> 
> Peter 
> 
> -- 
> http://mail.python.org/mailman/listinfo/python-list
> 
> !DSPAM:4ba0e1dc51621869525538!
> 

-----------------------------------
robert schaefer
Atmospheric Sciences Group
MIT Haystack Observatory
Westford, MA 01886

email:  rps at haystack.mit.edu
voice:  781-981-5767
www:  http://www.haystack.mit.edu



From robin at reportlab.com  Wed Mar 17 10:38:16 2010
From: robin at reportlab.com (Robin Becker)
Date: Wed, 17 Mar 2010 14:38:16 +0000
Subject: bug in bdist_wininst cross compile?
Message-ID: <4BA0E958.8050205@chamonix.reportlab.co.uk>

has anyone had any success with cross compilation and bdist_wininst; I have 
modified build_ext very slightly to fix a small bug in cross compilation related 
to library order. That seems to fix

setup.py build --plat-name=win-amd64


however, when I try to do a clean build of an exe ie

rm -rf build

setup.py bdist_wininst --plat-name=win-amd64

it appears as though build is invoked with the wrong plat-name ie I see this in 
the output

> running bdist_wininst
> running build
> running build_py
> creating build
> creating build\lib.win32-2.6
> creating build\lib.win32-2.6\reportlab
> copying src\reportlab\rl_config.py -> build\lib.win32-2.6\reportlab
......
> C:\Program Files\Microsoft Visual Studio 9.0\VC\BIN\cl.exe /c /nolog

followed by errors related to a missing library (the amd64 version won't work 
with a win32 build).

If I build first with

setup.py build --plat-name=win-amd64

and then use

setup.py bdist_wininst --plat-name=win-amd64 --skip-build

then I seem to get a proper amd64 exe.

I think the problem can be fixed by modifying distutils/command/bdist_wininst.py 
using this patch

> *** bdist_wininst.py.orig       Wed Mar 17 14:00:15 2010
> --- bdist_wininst.py    Wed Mar 17 14:29:55 2010
> ***************
> *** 79,90 ****
>
>       def finalize_options (self):
>           if self.bdist_dir is None:
> !             if self.skip_build and self.plat_name:
> !                 # If build is skipped and plat_name is overridden, bdist will
> !                 # not see the correct 'plat_name' - so set that up manually.
>                   bdist = self.distribution.get_command_obj('bdist')
>                   bdist.plat_name = self.plat_name
> !                 # next the command will be initialized using that name
>               bdist_base = self.get_finalized_command('bdist').bdist_base
>               self.bdist_dir = os.path.join(bdist_base, 'wininst')
>           if not self.target_version:
> --- 79,91 ----
>
>       def finalize_options (self):
>           if self.bdist_dir is None:
> !             if self.plat_name:
> !                 #bdist doesn't propagate plat_name so we do it here
> !                 build = self.distribution.get_command_obj('build')
> !                 build.plat_name = self.plat_name
>                   bdist = self.distribution.get_command_obj('bdist')
>                   bdist.plat_name = self.plat_name
> !                 # next the command(s) will be initialized using that name
>               bdist_base = self.get_finalized_command('bdist').bdist_base
>               self.bdist_dir = os.path.join(bdist_base, 'wininst')
>           if not self.target_version:

which forces bdist_wininst's version of the plat_name forward onto both build 
and bdist.
-- 
Robin Becker



From pmaupin at gmail.com  Wed Mar 17 10:43:50 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Wed, 17 Mar 2010 07:43:50 -0700 (PDT)
Subject: to pass self or not to pass self
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org> 
	<4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com> 
	<4ba09d09$0$21466$426a74cc@news.free.fr>
Message-ID: <503dc9c5-e1ce-4b33-aff4-ee9677839fe0@33g2000yqj.googlegroups.com>

On Mar 17, 4:12?am, Bruno Desthuilliers <bruno.
42.desthuilli... at websiteburo.invalid> wrote:
> Patrick Maupin a ?crit :
>
> > On Mar 16, 1:59 pm, Jason Tackaberry <t... at urandom.ca> wrote:
> >> Why not create the bound methods at instantiation time, rather than
> >> using the descriptor protocol which has the overhead of creating a new
> >> bound method each time the method attribute is accessed?
>
> > Well, for one thing, Python classes are open. ?They can be added to at
> > any time. ?For another thing, you might not ever use most of the
> > methods of an instance, so it would be a huge waste to create those.
>
> A possible optimization would be a simple memoization on first access.

I do agree that memoization on access is a good pattern, and I use it
frequently.  I don't know if I would want the interpreter
automagically doing that for everything, though -- it would require
some thought to figure out what the overhead cost is for the things
that are only used once.

Usually, I will have a slight naming difference for the things I want
memoized, to get the memoization code to run.  For example, if you add
an underbar in front of everything you want memoized:

class foo(object):

    def _bar(self):
        pass

    def __getattr__(self, aname):
        if aname.startswith('_'):
            raise AttributeError
        value = getattr(self, '_' + aname)
        self.aname = value
        return value

obj = foo()

So then the first time you look up obj.bar, it builds the bound
method, and on subsequent accesses it just returns the previously
bound method.

Regards,
Pat


From benjamin.kaplan at case.edu  Wed Mar 17 10:51:50 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 17 Mar 2010 10:51:50 -0400
Subject: Special characters (^M & ^[[D) when I read pxssh::before and 
	write it to a file
In-Reply-To: <771960b21003170654u1f6bac7bm1c0d7b30e2187f1f@mail.gmail.com>
References: <771960b21003170654u1f6bac7bm1c0d7b30e2187f1f@mail.gmail.com>
Message-ID: <ec96e1391003170751q355f54b7l843aacbf0a04a3de@mail.gmail.com>

On Wed, Mar 17, 2010 at 9:54 AM, ashwini yal <ashwiniyal at gmail.com> wrote:

> Hi,
>
> I am writing a python script which logs into the machine using pxssh, sends
> a command, reads the response and writes the response to the file.
>
> But, when I open the file in the editor like vi, its showing special
> characters like ^M and ^[[D instead of spaces or newlines.
>
> This is how my code looks like ...
>
> s = pxssh.pxssh()
> s.login(ip, username, password)
>
> cmd = 'xyz'
> s.sendline (cmd)
> s.prompt()
> output = s.before
> fileWrite = open(filePath , 'wb')
> fileWrite.write(output)
> s.prompt()
>
>
> This is how my filePath looks like when I open it using vi editor.
>
> Starting command execution on host xxx.xxx.xxx.xxx
>
>
> D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^[[D^M
>
> Command executed successfully ^M
>
> Executing next command ...^M
>
>
I don't know what's going with the ^[[D, but ^M is a carriage return. Your
connection is returning CRLF ("\r\n") for the line endings (which is what
Windows uses for line endings) instead of the Unix line ending, which is
just a line feed "\n".
-------------- next part --------------
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From bruno.42.desthuilliers at websiteburo.invalid  Wed Mar 17 10:51:53 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 17 Mar 2010 15:51:53 +0100
Subject: to pass self or not to pass self
In-Reply-To: <4ba0d65f$1@dnews.tpgi.com.au>
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org>
	<4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com>
	<4ba09d09$0$21466$426a74cc@news.free.fr>
	<4ba0d65f$1@dnews.tpgi.com.au>
Message-ID: <4ba0ec7a$0$14371$426a74cc@news.free.fr>

Lie Ryan a ?crit :
> On 03/17/2010 08:12 PM, Bruno Desthuilliers wrote:
>> Patrick Maupin a ?crit :
>>> On Mar 16, 1:59 pm, Jason Tackaberry <t... at urandom.ca> wrote:
>>>> Why not create the bound methods at instantiation time, rather than
>>>> using the descriptor protocol which has the overhead of creating a new
>>>> bound method each time the method attribute is accessed?
>>> Well, for one thing, Python classes are open.  They can be added to at
>>> any time.  For another thing, you might not ever use most of the
>>> methods of an instance, so it would be a huge waste to create those.
>> A possible optimization would be a simple memoization on first access.
> 
> But what if, for example, one uses some descriptor/metaclass magic to
> make it so that each subsequent access to the attribute returns a method
> bound to different objects?

Well, that's the whole problem with dynamism vs optimization...


From pengyu.ut at gmail.com  Wed Mar 17 10:53:42 2010
From: pengyu.ut at gmail.com (Peng Yu)
Date: Wed, 17 Mar 2010 09:53:42 -0500
Subject: highlight words by regex in pdf files using python
In-Reply-To: <1fc72785-e527-4809-b5a1-43d78fe86f87@r27g2000yqn.googlegroups.com>
References: <af0830ae-1d24-4db9-b721-d6602fedd540@15g2000yqi.googlegroups.com>
	<1fc72785-e527-4809-b5a1-43d78fe86f87@r27g2000yqn.googlegroups.com>
Message-ID: <366c6f341003170753o36316de3ie13f11fad0b29900@mail.gmail.com>

On Tue, Mar 16, 2010 at 11:12 PM, Patrick Maupin <pmaupin at gmail.com> wrote:
> On Mar 4, 6:57?pm, Peng Yu <pengyu... at gmail.com> wrote:
>> I don't find a general pdf library in python that can do any
>> operations on pdfs.
>>
>> I want to automatically highlight certain words (using regex) in a
>> pdf. Could somebody let me know if there is a tool to do so in python?
>
> The problem with PDFs is that they can be quite complicated. ?There is
> the outer container structure, which isn't too bad (unless the
> document author applied encryption or fancy multi-object compression),
> but then inside the graphics elements, things could be stored as
> regular ASCII, or as fancy indexes into font-specific tables. ?Not
> rocket science, but the only industrial-strength solution for this is
> probably reportlab's pagecatcher.
>
> I have a library which works (primarily with the outer container) for
> reading and writing, called pdfrw. ?I also maintain a list of other
> PDF tools at http://code.google.com/p/pdfrw/wiki/OtherLibraries ?It
> may be that pdfminer (link on that page) will do what you want -- it
> is certainly trying to be complete as a PDF reader. ?But I've never
> personally used pdfminer.
>
> One of my pdfrw examples at http://code.google.com/p/pdfrw/wiki/ExampleTools
> will read in preexisting PDFs and write them out to a reportlab
> canvas. ?This works quite well on a few very simple ASCII PDFs, but
> the font handling needs a lot of work and probably won't work at all
> right now on unicode. ?(But if you wanted to improve it, I certainly
> would accept patches or give you commit rights!)
>
> That pdfrw example does graphics reasonably well. ?I was actually
> going down that path for getting better vector graphics into rst2pdf
> (both uniconvertor and svglib were broken for my purposes), but then I
> realized that the PDF spec allows you to include a page from another
> PDF quite easily (the spec calls it a form xObject), so you don't
> actually need to parse down into the graphics stream for that. ?So,
> right now, the best way to do vector graphics with rst2pdf is either
> to give it a preexisting PDF (which it passes off to pdfrw for
> conversion into a form xObject), or to give it a .svg file and invoke
> it with -e inkscape, and then it will use inkscape to convert the svg
> to a pdf and then go through the same path.

Thank you for your long reply! But I'm not sure if you get my question or not.

Acrobat can highlight certain words in pdfs. I could add notes to the
highlighted words as well. However, I find that I frequently end up
with highlighting some words that can be expressed by a regular
expression.

To improve my productivity, I don't want do this manually in Acrobat
but rather do it in an automatic way, if there is such a tool
available. People in reportlab mailing list said this is not possible
with reportlab. And I don't see PyPDF can do this. If you know there
is an API to for this purpose, please let me know. Thank you!

Regards,
Peng


From wsantee at gmail.com  Wed Mar 17 10:57:43 2010
From: wsantee at gmail.com (Wes Santee)
Date: Wed, 17 Mar 2010 07:57:43 -0700 (PDT)
Subject: Structure accessible by attribute name or index
Message-ID: <189ec016-9c2e-44ac-b01a-c264f165c30d@30g2000yqi.googlegroups.com>

I am very new to Python, and trying to figure out how to create an
object that has values that are accessible either by attribute name,
or by index.  For example, the way os.stat() returns a stat_result or
pwd.getpwnam() returns a struct_passwd.

In trying to figure it out, I've only come across C implementations of
the above types.  Nothing specifically in Python.  What is the Python
native way to create this kind of object?

I apologize if this has been widely covered already.  In searching for
an answer, I must be missing some fundamental concept that is
excluding me from finding an answer.

Cheers,
-Wes


From pmaupin at gmail.com  Wed Mar 17 11:11:40 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Wed, 17 Mar 2010 10:11:40 -0500
Subject: highlight words by regex in pdf files using python
In-Reply-To: <366c6f341003170753o36316de3ie13f11fad0b29900@mail.gmail.com>
References: <af0830ae-1d24-4db9-b721-d6602fedd540@15g2000yqi.googlegroups.com>
	<1fc72785-e527-4809-b5a1-43d78fe86f87@r27g2000yqn.googlegroups.com>
	<366c6f341003170753o36316de3ie13f11fad0b29900@mail.gmail.com>
Message-ID: <d09829f51003170811u56df00a4ga83f3afa0501545c@mail.gmail.com>

On Wed, Mar 17, 2010 at 9:53 AM, Peng Yu <pengyu.ut at gmail.com> wrote:
> Thank you for your long reply! But I'm not sure if you get my question or not.
>
> Acrobat can highlight certain words in pdfs. I could add notes to the
> highlighted words as well. However, I find that I frequently end up
> with highlighting some words that can be expressed by a regular
> expression.
>
> To improve my productivity, I don't want do this manually in Acrobat
> but rather do it in an automatic way, if there is such a tool
> available. People in reportlab mailing list said this is not possible
> with reportlab. And I don't see PyPDF can do this. If you know there
> is an API to for this purpose, please let me know. Thank you!

I do not know of any API specific to this purpose, no.  But I
mentioned three libraries (pagecatcher, pdfminer, and pdfrw) that are
capable, to a greater or lesser extent, of reading in PDFs and giving
you the data from them, which you can then do your replacement on and
then write back out.  I would imagine this would be a piece of cake
with pagecatcher.  (I noticed you just posted on the reportlab mailing
list, but you did not specifically mention pagecatcher.)  It will
probably take more work with either of the other two.  It is probable
that none of them do exactly what you want, but also that any of them
is a better starting point than coding what you want from scratch.

Regards,
Pat


From lists at cheimes.de  Wed Mar 17 11:14:38 2010
From: lists at cheimes.de (Christian Heimes)
Date: Wed, 17 Mar 2010 16:14:38 +0100
Subject: Structure accessible by attribute name or index
In-Reply-To: <189ec016-9c2e-44ac-b01a-c264f165c30d@30g2000yqi.googlegroups.com>
References: <189ec016-9c2e-44ac-b01a-c264f165c30d@30g2000yqi.googlegroups.com>
Message-ID: <hnqrku$3ao$1@dough.gmane.org>

Wes Santee wrote:
> I am very new to Python, and trying to figure out how to create an
> object that has values that are accessible either by attribute name,
> or by index.  For example, the way os.stat() returns a stat_result or
> pwd.getpwnam() returns a struct_passwd.
> 
> In trying to figure it out, I've only come across C implementations of
> the above types.  Nothing specifically in Python.  What is the Python
> native way to create this kind of object?
> 
> I apologize if this has been widely covered already.  In searching for
> an answer, I must be missing some fundamental concept that is
> excluding me from finding an answer.

You can't use the same implementation as the result object of os.stat()
and others. However Python 2.6 has a new factory that creates a similar
datatype called named tuple:
http://docs.python.org/library/collections.html#namedtuple-factory-function-for-tuples-with-named-fields



From sparks.m at gmail.com  Wed Mar 17 11:16:49 2010
From: sparks.m at gmail.com (Michael Sparks)
Date: Wed, 17 Mar 2010 08:16:49 -0700 (PDT)
Subject: Nested Scopes unintended behaviour ?
Message-ID: <7a110632-d6c5-446b-a34b-95548fadb2f9@r27g2000yqn.googlegroups.com>

Hi,


Is the following behaviour expected ?

Python 2.6.4 (r264:75706, Dec  7 2009, 18:45:15)
[GCC 4.4.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> def Toggler(F, B):
...     print F("Hello")
...     print F("Hello")
...     print F("Hello")
...     print F("Hello")
...     print F("Hello")
...
>>> def Switcher(A,B):
...     on=True
...     def swtchfun(msg):
...         on_ = on
...         if on:
...             on = False
...             print "Switched to A"
...             return A
...         else:
...             print "Switched to B"
...             return B
...     #
...     return Toggler(swtchfun,True)
...
>>> Switcher(1,2)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 13, in Switcher
  File "<stdin>", line 2, in Toggler
  File "<stdin>", line 4, in swtchfun
UnboundLocalError: local variable 'on' referenced before assignment

The reason I ask is because logically it makes sense. The on_ = on
statement should resolve "on" to be the value on in the enclosing
scope, however it appears that the "on = False" statement is taking
priority. The reason I say this is because if you remove the "on =
False" line you get the expected name resolution:

>>> def Toggler(F, B):
...     print F("Hello")
...     print F("Hello")
...     print F("Hello")
...     print F("Hello")
...     print F("Hello")
...
>>> def Switcher(A,B):
...     on=True
...     def swtchfun(msg):
...         on_ = on
...         if on:
...             print "Switched to A"
...             return A
...         else:
...             print "Switched to B"
...             return B
...     #
...     return Toggler(swtchfun,True)
...
>>> Switcher(1,2)
Switched to A
1

ie it looks like python is not looking at the expected scope in the
first instance.

To me it looks like a bug, but I can also see a rationale where it's
considered a feature (because the "on" is on the left hand side
resolving the value to a local, rather than a value in an enclosed
scope)

I know that you can work around this as follows:
Python 2.6.4 (r264:75706, Dec  7 2009, 18:45:15)
[GCC 4.4.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> def Toggler(F, B):
...     print F("Hello")
...     print F("Hello")
...     print F("Hello")
...     print F("Hello")
...
>>> def Switcher(A,B):
...     def switchgen():
...         while True:
...             yield A
...             yield B
...     G = switchgen()
...     def swtchfun(msg):
...         return G.next()
...     #
...     return Toggler(swtchfun,True)
...
>>>
>>> Switcher(1,2)
1
2
1
2

But I'm curious as to whether the nested scope issue above is
considered a bug or a feature, so I can deal with it appropriately.

Any comments welcome :-)

Regards,


Michael.
--
http://yeoldeclue.com/blog
http://www.kamaelia.org/Home.html
http://twitter.com/kamaelian





From philip at semanchuk.com  Wed Mar 17 11:26:51 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Wed, 17 Mar 2010 11:26:51 -0400
Subject: multiprocessing on freebsd
In-Reply-To: <f1121800-f416-4455-b223-dfa562edb853@t23g2000yqt.googlegroups.com>
References: <f1121800-f416-4455-b223-dfa562edb853@t23g2000yqt.googlegroups.com>
Message-ID: <54550297-2B41-4A5B-8A0B-9ABF7B22D4B6@semanchuk.com>


On Mar 17, 2010, at 9:30 AM, Tim Arnold wrote:

> Hi,
> I'm checking to see if multiprocessing works on freebsd for any
> version of python. My server is about to get upgraded from 6.3 to 8.0
> and I'd sure like to be able to use multiprocessing.
>
> I think the minimal test would be:
> ---------------------
> import multiprocessing
> q = multiprocessing.Queue()
> ---------------------
>
> with 6.3, I get
>
> File "/usr/local/lib/python2.6/multiprocessing/__init__.py", line
> 212, in Queue
>    from multiprocessing.queues import Queue
>  File "/usr/local/lib/python2.6/multiprocessing/queues.py", line 22,
> in <module>
>    from multiprocessing.synchronize import Lock, BoundedSemaphore,
> Semaphore, Condition
>  File "/usr/local/lib/python2.6/multiprocessing/synchronize.py", line
> 33, in <module>
>    " function, see issue 3770.")
> ImportError: This platform lacks a functioning sem_open
> implementation, therefore, the required synchronization primitives
> needed will not function, see issue 3770.

Hi Tim,
Under FreeBSD 8/Python 2.6.2 I get the same result, unfortunately.  
That's a pity because sem_open works under FreeBSD >= 7.2 as we  
discussed before.


Issue 3770 is closed with the note, "we've removed hard-coded platform  
variables for a better autoconf approach." I'm using the Python built  
from FreeBSD's ports, and the note makes me think that it's possible  
that if I built my own Python from the Python.org tarball rather than  
ports the problem would go away due to autoconf magic. I don't have  
the time to offer to do this for you, unfortunately. But why not  
install FreeBSD 8 under VirtualBox or somesuch and give it a go  
yourself?

A couple of quirks I noted related to FreeBSD & POSIX IPC that you  
might find useful --
- The sem and mqueuefs kernel modules must be loaded, otherwise you'll  
get a message like this when you try to create a semaphore or message  
queue:
Bad system call: 12 (core dumped)

Under 8.0 they're loaded by default, I think.

- C apps that want to use message queues must link to the realtime  
libs (pass -lrt to the linker). This tripped me up for a while.  
Linking to the realtime libs is required for all POSIX IPC calls under  
Linux; FreeBSD does not require it for semaphores or shared mem, only  
message queues.


Hope this helps
Philip




From bruno.42.desthuilliers at websiteburo.invalid  Wed Mar 17 11:34:33 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 17 Mar 2010 16:34:33 +0100
Subject: Structure accessible by attribute name or index
In-Reply-To: <189ec016-9c2e-44ac-b01a-c264f165c30d@30g2000yqi.googlegroups.com>
References: <189ec016-9c2e-44ac-b01a-c264f165c30d@30g2000yqi.googlegroups.com>
Message-ID: <4ba0f67a$0$17757$426a74cc@news.free.fr>

Wes Santee a ?crit :
> I am very new to Python, and trying to figure out how to create an
> object that has values that are accessible either by attribute name,
> or by index.  For example, the way os.stat() returns a stat_result or
> pwd.getpwnam() returns a struct_passwd.
> 
> In trying to figure it out, I've only come across C implementations of
> the above types.  Nothing specifically in Python.  What is the Python
> native way to create this kind of object?

Using the appropriate __magicmethods__ for indexed access and computed 
attributes for the attribute access might be a good solution:

# warning : Q&D implementation, would require some sanity checks.

class IndexedValueDescriptor(object):
     def __init__(self, index):
         self._index = index
     def __get__(self, instance, cls):
         if instance is None:
             return self
         return instance[self._index]
     def __set__(self, instance, value):
         instance[self._index] = value

class Structure(object):
     def __init__(self, value1, value2, value3):
         self._values = [value1, value2, value3]
     def __setitem__(self, index, value):
         self._values[index] = value
     def __getitem__(self, index):
         return self._values[index]
     value1 = IndexedValueDescriptor(0)
     value2 = IndexedValueDescriptor(1)
     value3 = IndexedValueDescriptor(2)




Note that there are probably other solutions... Don't know how 
os.stat_result is implemented, might be worth looking at the source 
code. But anyway : the above should get you started.

> I apologize if this has been widely covered already.   In searching for
> an answer, I must be missing some fundamental concept that is
> excluding me from finding an answer.

Well, that's not really a FAQ AFAICT !-)


From bruno.42.desthuilliers at websiteburo.invalid  Wed Mar 17 11:35:41 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 17 Mar 2010 16:35:41 +0100
Subject: Structure accessible by attribute name or index
In-Reply-To: <mailman.918.1268838898.23598.python-list@python.org>
References: <189ec016-9c2e-44ac-b01a-c264f165c30d@30g2000yqi.googlegroups.com>
	<mailman.918.1268838898.23598.python-list@python.org>
Message-ID: <4ba0f6be$0$17757$426a74cc@news.free.fr>

Christian Heimes a ?crit :
> However Python 2.6 has a new factory that creates a similar
> datatype called named tuple:
> http://docs.python.org/library/collections.html#namedtuple-factory-function-for-tuples-with-named-fields
> 

Duh... Should spend some more time reading 2.6's What's New :(


From emile at fenx.com  Wed Mar 17 11:44:03 2010
From: emile at fenx.com (Emile van Sebille)
Date: Wed, 17 Mar 2010 08:44:03 -0700
Subject: Nested Scopes unintended behaviour ?
In-Reply-To: <7a110632-d6c5-446b-a34b-95548fadb2f9@r27g2000yqn.googlegroups.com>
References: <7a110632-d6c5-446b-a34b-95548fadb2f9@r27g2000yqn.googlegroups.com>
Message-ID: <hnqtbp$bbb$1@dough.gmane.org>

On 3/17/2010 8:16 AM Michael Sparks said...
> Hi,
>
>
> Is the following behaviour expected ?

In short, yes.  Assignment within a function forces the variable to 
locals.  You can get around it like:

>
> Python 2.6.4 (r264:75706, Dec  7 2009, 18:45:15)
> [GCC 4.4.1] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> def Toggler(F, B):
> ...     print F("Hello")
> ...     print F("Hello")
> ...     print F("Hello")
> ...     print F("Hello")
> ...     print F("Hello")
> ...
>>>> def Switcher(A,B):
> ...     on=True
> ...     def swtchfun(msg):

--->      def swtchfun(msg, on=on):

> ...         on_ = on
> ...         if on:
> ...             on = False
> ...             print "Switched to A"
> ...             return A
> ...         else:
> ...             print "Switched to B"
> ...             return B
> ...     #
> ...     return Toggler(swtchfun,True)
> ...
>>>> Switcher(1,2)
> Traceback (most recent call last):
>    File "<stdin>", line 1, in<module>
>    File "<stdin>", line 13, in Switcher
>    File "<stdin>", line 2, in Toggler
>    File "<stdin>", line 4, in swtchfun
> UnboundLocalError: local variable 'on' referenced before assignment
>
> The reason I ask is because logically it makes sense. The on_ = on
> statement should resolve "on" to be the value on in the enclosing
> scope, however it appears that the "on = False" statement is taking
> priority. The reason I say this is because if you remove the "on =
> False" line you get the expected name resolution:
>
>>>> def Toggler(F, B):
> ...     print F("Hello")
> ...     print F("Hello")
> ...     print F("Hello")
> ...     print F("Hello")
> ...     print F("Hello")
> ...
>>>> def Switcher(A,B):
> ...     on=True
> ...     def swtchfun(msg):
> ...         on_ = on
> ...         if on:
> ...             print "Switched to A"
> ...             return A
> ...         else:
> ...             print "Switched to B"
> ...             return B
> ...     #
> ...     return Toggler(swtchfun,True)
> ...
>>>> Switcher(1,2)
> Switched to A
> 1
>
> ie it looks like python is not looking at the expected scope in the
> first instance.
>
> To me it looks like a bug, but I can also see a rationale where it's
> considered a feature (because the "on" is on the left hand side
> resolving the value to a local, rather than a value in an enclosed
> scope)
>
> I know that you can work around this as follows:
> Python 2.6.4 (r264:75706, Dec  7 2009, 18:45:15)
> [GCC 4.4.1] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> def Toggler(F, B):
> ...     print F("Hello")
> ...     print F("Hello")
> ...     print F("Hello")
> ...     print F("Hello")
> ...
>>>> def Switcher(A,B):
> ...     def switchgen():
> ...         while True:
> ...             yield A
> ...             yield B
> ...     G = switchgen()
> ...     def swtchfun(msg):
> ...         return G.next()
> ...     #
> ...     return Toggler(swtchfun,True)
> ...
>>>>
>>>> Switcher(1,2)
> 1
> 2
> 1
> 2
>
> But I'm curious as to whether the nested scope issue above is
> considered a bug or a feature, so I can deal with it appropriately.
>
> Any comments welcome :-)
>
> Regards,
>
>
> Michael.
> --
> http://yeoldeclue.com/blog
> http://www.kamaelia.org/Home.html
> http://twitter.com/kamaelian
>
>
>




From nobody at nowhere.com  Wed Mar 17 11:44:34 2010
From: nobody at nowhere.com (Nobody)
Date: Wed, 17 Mar 2010 15:44:34 +0000
Subject: execute bash builtins in python
References: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com>
	<mailman.660.1268399795.23598.python-list@python.org>
Message-ID: <pan.2010.03.17.15.44.34.750000@nowhere.com>

On Fri, 12 Mar 2010 08:15:49 -0500, Steve Holden wrote:

> For shell=True I believe you should provide the command as a single
> string, not a list of arguments.

Using shell=True with an argument list is valid.

On Unix, it's seldom what you want: it will invoke /bin/sh to execute the
first argument with $1, $2, ... set from the remaining arguments.

On Windows, a list is converted to a string in the same manner regardless
of the value of the "shell" argument. Specifying shell=True causes the
command string to be executed via "cmd /c ...". This allows the "program"
to be a script, whereas shell=False requires the program to be a binary
executable.



From python at hope.cz  Wed Mar 17 11:47:07 2010
From: python at hope.cz (Johny)
Date: Wed, 17 Mar 2010 08:47:07 -0700 (PDT)
Subject: pkg-config and Windows
Message-ID: <e3c426e9-2696-4cb0-814a-dbb1db16ee37@33g2000yqj.googlegroups.com>

I have a program that needs to be installed with setup.py. But there
is a problem when I am trying to install the program with setup.py in
Windows. When I try to install with

python setup.py install
it goes like this

C:\>python setup.py install
 running install
 running build
 running build_py
 running build_ext
 ERROR: Could not find pkg-config!

As you can see
the installation finishes with the error:
Could not find pkg-config!

Is there any way how to find out pkg-config in Windows?
or how to solve the problem?
Thanks
L.



From tundra at tundraware.com  Wed Mar 17 12:32:45 2010
From: tundra at tundraware.com (Tim Daneliuk)
Date: Wed, 17 Mar 2010 11:32:45 -0500
Subject: Win32All On 64-Bit Operating Systems
Message-ID: <fpc777-2iu1.ln1@ozzie.tundraware.com>

I have a pure-Python program developed on a POSIX platform (FreeBSD) that
I'd like to make fully compatible with Windows systems as well.  The only
conflict arises insofar as this program makes considerable use of the
stat UID and GID values, as well as their corresponding user- and group
names.  Since Windows has not grp and pwd modules, I need to synthesize
this.

In the past, I've solved this problem by detecting the presence of Win32All.
If present, I do the necessary magic to return the true UID/name, GID/name
info from Windows itself.  If not, I return UID/GID as provided by an
os.stat call and use the phoby names "winuser" and "wingroup" respectively.

Now for the question:  Is there even an instance of Win32All for 64-bit
OSs like Vista and Win7?  If not, I'm inclined not bother with it at all
and just return the phony values as placeholders because I do not want
different features on 32- and 64-bit platforms.

Thanks,
-- 
----------------------------------------------------------------------------
Tim Daneliuk     tundra at tundraware.com
PGP Key:         http://www.tundraware.com/PGP/



From wsantee at gmail.com  Wed Mar 17 12:40:44 2010
From: wsantee at gmail.com (Wes Santee)
Date: Wed, 17 Mar 2010 09:40:44 -0700 (PDT)
Subject: Structure accessible by attribute name or index
References: <189ec016-9c2e-44ac-b01a-c264f165c30d@30g2000yqi.googlegroups.com>
	<mailman.918.1268838898.23598.python-list@python.org>
Message-ID: <23c6223c-cc65-44e2-a400-aba5d0a010a6@m37g2000yqf.googlegroups.com>

On Mar 17, 11:14?am, Christian Heimes <li... at cheimes.de> wrote:
> Wes Santee wrote:
> > I am very new to Python, and trying to figure out how to create an
> > object that has values that are accessible either by attribute name,
> > or by index. ?For example, the way os.stat() returns a stat_result or
> > pwd.getpwnam() returns a struct_passwd.
>
> > In trying to figure it out, I've only come across C implementations of
> > the above types. ?Nothing specifically in Python. ?What is the Python
> > native way to create this kind of object?
>
> > I apologize if this has been widely covered already. ?In searching for
> > an answer, I must be missing some fundamental concept that is
> > excluding me from finding an answer.
>
> You can't use the same implementation as the result object of os.stat()
> and others. However Python 2.6 has a new factory that creates a similar
> datatype called named tuple:http://docs.python.org/library/collections.html#namedtuple-factory-fu...

Thanks for the pointer.  At least I know there is a reason why I
wasn't finding a solution. :)



From wsantee at gmail.com  Wed Mar 17 12:55:07 2010
From: wsantee at gmail.com (Wes Santee)
Date: Wed, 17 Mar 2010 09:55:07 -0700 (PDT)
Subject: Structure accessible by attribute name or index
References: <189ec016-9c2e-44ac-b01a-c264f165c30d@30g2000yqi.googlegroups.com>
	<4ba0f67a$0$17757$426a74cc@news.free.fr>
Message-ID: <2e0ba087-eb30-460e-a6e2-b29498669107@33g2000yqj.googlegroups.com>

On Mar 17, 11:34?am, Bruno Desthuilliers <bruno.
42.desthuilli... at websiteburo.invalid> wrote:
> Wes Santee a ?crit :
>
> > I am very new to Python, and trying to figure out how to create an
> > object that has values that are accessible either by attribute name,
> > or by index. ?For example, the way os.stat() returns a stat_result or
> > pwd.getpwnam() returns a struct_passwd.
>
> > In trying to figure it out, I've only come across C implementations of
> > the above types. ?Nothing specifically in Python. ?What is the Python
> > native way to create this kind of object?
>
> Using the appropriate __magicmethods__ for indexed access and computed
> attributes for the attribute access might be a good solution:

This is as good an excuse as any to get familiar with the rest of the
__magicmethods__. :)

>
> # warning : Q&D implementation, would require some sanity checks.
>
> class IndexedValueDescriptor(object):
> ? ? ?def __init__(self, index):
> ? ? ? ? ?self._index = index
> ? ? ?def __get__(self, instance, cls):
> ? ? ? ? ?if instance is None:
> ? ? ? ? ? ? ?return self
> ? ? ? ? ?return instance[self._index]
> ? ? ?def __set__(self, instance, value):
> ? ? ? ? ?instance[self._index] = value
>
> class Structure(object):
> ? ? ?def __init__(self, value1, value2, value3):
> ? ? ? ? ?self._values = [value1, value2, value3]
> ? ? ?def __setitem__(self, index, value):
> ? ? ? ? ?self._values[index] = value
> ? ? ?def __getitem__(self, index):
> ? ? ? ? ?return self._values[index]
> ? ? ?value1 = IndexedValueDescriptor(0)
> ? ? ?value2 = IndexedValueDescriptor(1)
> ? ? ?value3 = IndexedValueDescriptor(2)
>
> Note that there are probably other solutions... Don't know how
> os.stat_result is implemented, might be worth looking at the source
> code. But anyway : the above should get you started.
>
> > I apologize if this has been widely covered already. ? In searching for
> > an answer, I must be missing some fundamental concept that is
> > excluding me from finding an answer.
>
> Well, that's not really a FAQ AFAICT !-)



From mail at timgolden.me.uk  Wed Mar 17 13:05:48 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 17 Mar 2010 17:05:48 +0000
Subject: Win32All On 64-Bit Operating Systems
In-Reply-To: <fpc777-2iu1.ln1@ozzie.tundraware.com>
References: <fpc777-2iu1.ln1@ozzie.tundraware.com>
Message-ID: <4BA10BEC.2080802@timgolden.me.uk>

On 17/03/2010 16:32, Tim Daneliuk wrote:
> I have a pure-Python program developed on a POSIX platform (FreeBSD) that
> I'd like to make fully compatible with Windows systems as well.  The only
> conflict arises insofar as this program makes considerable use of the
> stat UID and GID values, as well as their corresponding user- and group
> names.  Since Windows has not grp and pwd modules, I need to synthesize
> this.
>
> In the past, I've solved this problem by detecting the presence of Win32All.
> If present, I do the necessary magic to return the true UID/name, GID/name
> info from Windows itself.  If not, I return UID/GID as provided by an
> os.stat call and use the phoby names "winuser" and "wingroup" respectively.
>
> Now for the question:  Is there even an instance of Win32All for 64-bit
> OSs like Vista and Win7?  If not, I'm inclined not bother with it at all
> and just return the phony values as placeholders because I do not want
> different features on 32- and 64-bit platforms.

Looks like it:

   http://sourceforge.net/projects/pywin32/files/

but, frankly, I wouldn't bother with the uid/gid thing on
Windows. It's nearly meaningless most of the time. Just
return placeholders.

TJG


From andrej.mitrovich at gmail.com  Wed Mar 17 13:41:14 2010
From: andrej.mitrovich at gmail.com (Andrej Mitrovic)
Date: Wed, 17 Mar 2010 10:41:14 -0700 (PDT)
Subject: Python Documentation website layout changed?
Message-ID: <21fcbd63-fd1e-4b53-89b3-393c15591372@m37g2000yqf.googlegroups.com>

Hi,

What happened to the sidebar on the left of the documentation website?
It seems to be gone:

http://docs.python.org/py3k/index.html

I found it quite useful since I can quickly swap between Python2/3
documentation, and between other parts of the documentation as well.


From a_jtim at bellsouth.net  Wed Mar 17 13:57:42 2010
From: a_jtim at bellsouth.net (Tim Arnold)
Date: Wed, 17 Mar 2010 10:57:42 -0700 (PDT)
Subject: multiprocessing on freebsd
References: <f1121800-f416-4455-b223-dfa562edb853@t23g2000yqt.googlegroups.com>
	<mailman.919.1268839620.23598.python-list@python.org>
Message-ID: <4b29e714-df56-49be-a836-51d5833765f8@x12g2000yqx.googlegroups.com>

On Mar 17, 11:26?am, Philip Semanchuk <phi... at semanchuk.com> wrote:
> On Mar 17, 2010, at 9:30 AM, Tim Arnold wrote:
>
>
>
>
>
> > Hi,
> > I'm checking to see if multiprocessing works on freebsd for any
> > version of python. My server is about to get upgraded from 6.3 to 8.0
> > and I'd sure like to be able to use multiprocessing.
>
> > I think the minimal test would be:
> > ---------------------
> > import multiprocessing
> > q = multiprocessing.Queue()
> > ---------------------
>
> > with 6.3, I get
>
> > File "/usr/local/lib/python2.6/multiprocessing/__init__.py", line
> > 212, in Queue
> > ? ?from multiprocessing.queues import Queue
> > ?File "/usr/local/lib/python2.6/multiprocessing/queues.py", line 22,
> > in <module>
> > ? ?from multiprocessing.synchronize import Lock, BoundedSemaphore,
> > Semaphore, Condition
> > ?File "/usr/local/lib/python2.6/multiprocessing/synchronize.py", line
> > 33, in <module>
> > ? ?" function, see issue 3770.")
> > ImportError: This platform lacks a functioning sem_open
> > implementation, therefore, the required synchronization primitives
> > needed will not function, see issue 3770.
>
> Hi Tim,
> Under FreeBSD 8/Python 2.6.2 I get the same result, unfortunately. ?
> That's a pity because sem_open works under FreeBSD >= 7.2 as we ?
> discussed before.
>
> Issue 3770 is closed with the note, "we've removed hard-coded platform ?
> variables for a better autoconf approach." I'm using the Python built ?
> from FreeBSD's ports, and the note makes me think that it's possible ?
> that if I built my own Python from the Python.org tarball rather than ?
> ports the problem would go away due to autoconf magic. I don't have ?
> the time to offer to do this for you, unfortunately. But why not ?
> install FreeBSD 8 under VirtualBox or somesuch and give it a go ?
> yourself?
>
> A couple of quirks I noted related to FreeBSD & POSIX IPC that you ?
> might find useful --
> - The sem and mqueuefs kernel modules must be loaded, otherwise you'll ?
> get a message like this when you try to create a semaphore or message ?
> queue:
> Bad system call: 12 (core dumped)
>
> Under 8.0 they're loaded by default, I think.
>
> - C apps that want to use message queues must link to the realtime ?
> libs (pass -lrt to the linker). This tripped me up for a while. ?
> Linking to the realtime libs is required for all POSIX IPC calls under ?
> Linux; FreeBSD does not require it for semaphores or shared mem, only ?
> message queues.
>
> Hope this helps
> Philip

Hi Philip,
Thanks for that information (esp the linker info). Once the machine is
upgraded, I'll try building python from the tarball. I'll post back
here with the results.

here's hoping!
thanks,
--Tim


From sccolbert at gmail.com  Wed Mar 17 14:14:14 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Wed, 17 Mar 2010 14:14:14 -0400
Subject: execute bash builtins in python
In-Reply-To: <pan.2010.03.17.15.44.34.750000@nowhere.com>
References: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com>
	<mailman.660.1268399795.23598.python-list@python.org>
	<pan.2010.03.17.15.44.34.750000@nowhere.com>
Message-ID: <7f014ea61003171114j60aa2a2co19e138e46ea4ee4d@mail.gmail.com>

On Wed, Mar 17, 2010 at 11:44 AM, Nobody <nobody at nowhere.com> wrote:

> On Fri, 12 Mar 2010 08:15:49 -0500, Steve Holden wrote:
>
> > For shell=True I believe you should provide the command as a single
> > string, not a list of arguments.
>
> Using shell=True with an argument list is valid.
>
> On Unix, it's seldom what you want: it will invoke /bin/sh to execute the
> first argument with $1, $2, ... set from the remaining arguments.
>
> On Windows, a list is converted to a string in the same manner regardless
> of the value of the "shell" argument. Specifying shell=True causes the
> command string to be executed via "cmd /c ...". This allows the "program"
> to be a script, whereas shell=False requires the program to be a binary
> executable.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


if you can work interactively, save yourself the headache and just use
Ipython:

brucewayne at broo:~$ ipython
Python 2.6.4 (r264:75706, Dec  7 2009, 18:43:55)
Type "copyright", "credits" or "license" for more information.

IPython 0.10 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object'. ?object also works, ?? prints more.

In [1]: alias
Total number of aliases: 15
Out[1]:
[('cat', 'cat'),
 ('clear', 'clear'),
 ('less', 'less'),
 ('mkdir', 'mkdir'),
 ('rmdir', 'rmdir'),
 ('cp', 'cp -i'),
 ('lc', 'ls -F -o --color'),
 ('ldir', 'ls -F -o --color %l | grep /$'),
 ('lf', 'ls -F -o --color %l | grep ^-'),
 ('lk', 'ls -F -o --color %l | grep ^l'),
 ('ll', 'ls -lF'),
 ('ls', 'ls -F'),
 ('lx', 'ls -F -o --color %l | grep ^-..x'),
 ('mv', 'mv -i'),
 ('rm', 'rm -i')]

In [2]:
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-list/attachments/20100317/b42baeab/attachment-0001.html>

From andrej.mitrovich at gmail.com  Wed Mar 17 14:16:42 2010
From: andrej.mitrovich at gmail.com (Andrej Mitrovic)
Date: Wed, 17 Mar 2010 11:16:42 -0700 (PDT)
Subject: Python Documentation website layout changed?
References: <21fcbd63-fd1e-4b53-89b3-393c15591372@m37g2000yqf.googlegroups.com>
Message-ID: <27c7e0a7-5a26-40f2-94ba-0af9cb530d67@g28g2000yqh.googlegroups.com>

On Mar 17, 6:41?pm, Andrej Mitrovic <andrej.mitrov... at gmail.com>
wrote:
> Hi,
>
> What happened to the sidebar on the left of the documentation website?
> It seems to be gone:
>
> http://docs.python.org/py3k/index.html
>
> I found it quite useful since I can quickly swap between Python2/3
> documentation, and between other parts of the documentation as well.

Edit: It looks like only the Python 3 pages are affected, the Python 2
pages are the same as before:

http://docs.python.org/index.html

Might be a bug?


From steve at holdenweb.com  Wed Mar 17 14:34:17 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 17 Mar 2010 14:34:17 -0400
Subject: Python Documentation website layout changed?
In-Reply-To: <27c7e0a7-5a26-40f2-94ba-0af9cb530d67@g28g2000yqh.googlegroups.com>
References: <21fcbd63-fd1e-4b53-89b3-393c15591372@m37g2000yqf.googlegroups.com>
	<27c7e0a7-5a26-40f2-94ba-0af9cb530d67@g28g2000yqh.googlegroups.com>
Message-ID: <4BA120A9.3060001@holdenweb.com>

Andrej Mitrovic wrote:
> On Mar 17, 6:41 pm, Andrej Mitrovic <andrej.mitrov... at gmail.com>
> wrote:
>> Hi,
>>
>> What happened to the sidebar on the left of the documentation website?
>> It seems to be gone:
>>
>> http://docs.python.org/py3k/index.html
>>
>> I found it quite useful since I can quickly swap between Python2/3
>> documentation, and between other parts of the documentation as well.
> 
> Edit: It looks like only the Python 3 pages are affected, the Python 2
> pages are the same as before:
> 
> http://docs.python.org/index.html
> 
> Might be a bug?

I'll ask. Georg - is this known behavior or a temporary problem?

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From anthra.norell at bluewin.ch  Wed Mar 17 14:43:00 2010
From: anthra.norell at bluewin.ch (Anthra Norell)
Date: Wed, 17 Mar 2010 19:43:00 +0100
Subject: How to access a web site with an authentication template.
Message-ID: <4BA122B4.5030003@bluewin.ch>

Hi all,

   I have spent the better part of this day reading docs and googling 
archives to no avail. About this: I understand that I can access 
password protected sites with urllib2. However, the protocol seems to 
be: I try without password and catch the error coming back. The header 
will then tell me what the server expects in the line of formats. That 
doesn't work with a site I am dealing with, because the opening page 
does not require a password. It presents an id/password entry template 
and I have no clue how to respond in python. The page source is chock 
full of java script. The header--if that means anything--is:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang = "en-us">

<head id="ctl00_Head1"><meta http-equiv="Content-Type" 
content="text/html; charset=UTF-8" />
<link id="ctl00_glbalLayoutCSS" rel="stylesheet" type="text/css" 
href="/cve/p/6/Default/Styles/global_layout.css" />
... more CSS
<!--  Site level default.  The only time a firm.css is required is for 
segment variations.  -->

I don't expect solutions, but rather pointers to relevant reading.

Thanks

Frederic




From tundra at tundraware.com  Wed Mar 17 15:07:14 2010
From: tundra at tundraware.com (Tim Daneliuk)
Date: Wed, 17 Mar 2010 14:07:14 -0500
Subject: Win32All On 64-Bit Operating Systems
In-Reply-To: <mailman.921.1268845558.23598.python-list@python.org>
References: <fpc777-2iu1.ln1@ozzie.tundraware.com>
	<mailman.921.1268845558.23598.python-list@python.org>
Message-ID: <3rl777-q1m2.ln1@ozzie.tundraware.com>

On 3/17/2010 12:05 PM, Tim Golden wrote:
> On 17/03/2010 16:32, Tim Daneliuk wrote:
>> I have a pure-Python program developed on a POSIX platform (FreeBSD) that
>> I'd like to make fully compatible with Windows systems as well.  The only
>> conflict arises insofar as this program makes considerable use of the
>> stat UID and GID values, as well as their corresponding user- and group
>> names.  Since Windows has not grp and pwd modules, I need to synthesize
>> this.
>>
>> In the past, I've solved this problem by detecting the presence of
>> Win32All.
>> If present, I do the necessary magic to return the true UID/name,
>> GID/name
>> info from Windows itself.  If not, I return UID/GID as provided by an
>> os.stat call and use the phoby names "winuser" and "wingroup"
>> respectively.
>>
>> Now for the question:  Is there even an instance of Win32All for 64-bit
>> OSs like Vista and Win7?  If not, I'm inclined not bother with it at all
>> and just return the phony values as placeholders because I do not want
>> different features on 32- and 64-bit platforms.
> 
> Looks like it:
> 
>   http://sourceforge.net/projects/pywin32/files/

Thanks!

> 
> but, frankly, I wouldn't bother with the uid/gid thing on
> Windows. It's nearly meaningless most of the time. Just
> return placeholders.
> 
> TJG

That's not really so. Windows definitely has the notions of users and groups,
they just don't quite align with the POSIX model exactly.

-- 
----------------------------------------------------------------------------
Tim Daneliuk     tundra at tundraware.com
PGP Key:         http://www.tundraware.com/PGP/



From xahlee at gmail.com  Wed Mar 17 15:17:28 2010
From: xahlee at gmail.com (Xah Lee)
Date: Wed, 17 Mar 2010 12:17:28 -0700 (PDT)
Subject: to RG - Lisp lunacy and Perl psychosis
References: <19c5b00d-c1e0-4016-9f72-37229cbf42b9@g19g2000yqe.googlegroups.com>
	<79tk67-rp51.ln1@osiris.mauzo.dyndns.org>
Message-ID: <6ede3156-9e9c-45ed-a532-89f5825646ea@p3g2000pra.googlegroups.com>

2010-03-17

On Mar 10, 9:17?am, Ben Morrow <b... at morrow.me.uk> wrote:
> Also, flamebait language-comparison xposts involving Lisp are one
> of Xah Lee's trademarks. You might want to look into not imitating
> him/her/it.

being a professional programer today, typically you know more than
just one language. Practical questions, discussions, involving more
than one language is natural, and in fact happens more and more often
in online forums over the past 15 years i've seen. Partly due to, of
course, the tremendous birth of languages in the past decade.

In the 1980s or 1990s, you don't typically use more than one lang in a
project. Today, probably majority of projects requires you to use more
than one well known general purpose language. In those times,
discussion of more than one language is usually academic comparison.
Today, honest post as ?i know this in X but how you do in Y? is a
common need.

The reason they become flame wars is mostly not about the message
content. More about tech geeker's sensitivity, with the carried over
old school netiquette that any person mentioning lang x in group y
must be of no good intentions.

If you look at online forums today, in fact most comp lang forums have
no problem in mentioning or discussion different languages in context.
The problem occur more frequently in free-for-all type of forums where
the know-it-all tech geekers reside (the in-group argot is ?hacker?),
each thinking they are justice kings and queens, take opportunities to
ridicule, flame, any post that mention other lang or any thing that
doesn't seem to be protective of their lang. This is comp.lang.*
newsgroups, with good as well as mostly bad aspects. Of course, the
free-for-all nature is precisely the reason most tech geekers stay in
newsgroups. A good percentage of them, if not majority, are old
timers.

Most newsgroup tech geekers consider cross-posting wrong. I consider
such taboo in this convention being a major contribution to the
redundant creation of new languages, flaws, and foster the hostile
faction nature of programing language groups we see.

It is sad to say, comp.lang.lisp today is 90% machine generated spam.
You see that each time this is brought up in the past 3 years, the
regulars are too busy boasting about how they've set up some tech geek
system so that spam don't reach their eyes, and sternly sputter about
web browser using idiots, with, profuse suggestions from their
infinite knowledge about what newsgroup reading software people should
be using.

To the comp.lang.python people, i think perhaps it is fruitful now to
think about de-coupling the newsgroup from the mailing list... am not
very involved in the comp.lang.python or python community in recent
years, but my thought is that, i got the feeling that most practical
posts happen in the mailing list and the newsgroup ones tend to be
more free flow of thoughts... so perhaps de-couple them is good,
because python is main stream now and mailing list is sustainable
large, is good for more practical, concrete questions and answers, and
philosophical free thoughts still have a place to go, in newsgroups.

further readings:

? Proliferation of Computing Languages
  xahlee.org/UnixResource_dir/writ/new_langs.html

? Tech Geekers vs Spammers
  xahlee.org/UnixResource_dir/writ/tech_geekers_vs_spammers.html

? Cross-posting & Language Factions
  xahlee.org/Netiquette_dir/cross-post.html

  Xah
? http://xahlee.org/

?


From martin.hellwig at dcuktec.org  Wed Mar 17 15:25:44 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Wed, 17 Mar 2010 19:25:44 +0000
Subject: multiprocessing on freebsd
In-Reply-To: <f1121800-f416-4455-b223-dfa562edb853@t23g2000yqt.googlegroups.com>
References: <f1121800-f416-4455-b223-dfa562edb853@t23g2000yqt.googlegroups.com>
Message-ID: <hnrabj$c4v$1@news.eternal-september.org>

On 03/17/10 13:30, Tim Arnold wrote:
> Hi,
> I'm checking to see if multiprocessing works on freebsd for any
> version of python. My server is about to get upgraded from 6.3 to 8.0
> and I'd sure like to be able to use multiprocessing.
>
> I think the minimal test would be:
> ---------------------
> import multiprocessing
> q = multiprocessing.Queue()
> ---------------------
>
> with 6.3, I get
>
>   File "/usr/local/lib/python2.6/multiprocessing/__init__.py", line
> 212, in Queue
>      from multiprocessing.queues import Queue
>    File "/usr/local/lib/python2.6/multiprocessing/queues.py", line 22,
> in<module>
>      from multiprocessing.synchronize import Lock, BoundedSemaphore,
> Semaphore, Condition
>    File "/usr/local/lib/python2.6/multiprocessing/synchronize.py", line
> 33, in<module>
>      " function, see issue 3770.")
> ImportError: This platform lacks a functioning sem_open
> implementation, therefore, the required synchronization primitives
> needed will not function, see issue 3770.
>

Build mine from ports, with the following options (notice SEM & PTH):
[martin at aspire8930 /usr/home/martin]$ cat /var/db/ports/python26/options
# This file is auto-generated by 'make config'.
# No user-servicable parts inside!
# Options for python26-2.6.4
_OPTIONS_READ=python26-2.6.4
WITH_THREADS=true
WITHOUT_HUGE_STACK_SIZE=true
WITH_SEM=true
WITH_PTH=true
WITH_UCS4=true
WITH_PYMALLOC=true
WITH_IPV6=true
WITHOUT_FPECTL=true

[martin at aspire8930 /usr/home/martin]$ uname -a
FreeBSD aspire8930 8.0-STABLE FreeBSD 8.0-STABLE #3: Wed Feb  3 17:01:18 
GMT 2010     martin at aspire8930:/usr/obj/usr/src/sys/ASPIRE8930  amd64
[martin at aspire8930 /usr/home/martin]$ python
Python 2.6.4 (r264:75706, Mar 17 2010, 18:44:24)
[GCC 4.2.1 20070719  [FreeBSD]] on freebsd8
Type "help", "copyright", "credits" or "license" for more information.
 >>> import multiprocessing as mp
 >>> queue = mp.Queue()
 >>>

hth
-- 
mph


From tjreedy at udel.edu  Wed Mar 17 15:55:35 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 17 Mar 2010 15:55:35 -0400
Subject: to pass self or not to pass self
In-Reply-To: <4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com>
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>	<4b9f4984$0$10229$426a74cc@news.free.fr>	<mailman.860.1268765949.23598.python-list@python.org>
	<4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com>
Message-ID: <hnrc3p$a6t$1@dough.gmane.org>

On 3/17/2010 1:35 AM, Patrick Maupin wrote:
>>>> def a(s, count, lenfunc):
> ...     for i in xrange(count):
> ...        z = lenfunc(s)
> ...
>>>> >>>  a('abcdef', 100000000, len)
>>>> >>>  a('abcdef', 100000000, str.__len__)
> Running cPython 2.6 on my machine, len() runs about 3 times faster
> than str.__len__().  The overhead of checking that an object is usable
> with a particular class method far outweighs the cost of creating the
> bound method!

Wow, this so surprised me, that I had to try it with 3.1 (on winxp), and 
got a similar result (about 2.6x longer with str.__len__). This is a 
real lesson in measure, don't guess, and how premature 'optimization' 
may be a pessimization. Thanks.

Terry Jan Reedy





From mail at timgolden.me.uk  Wed Mar 17 15:59:57 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 17 Mar 2010 19:59:57 +0000
Subject: Win32All On 64-Bit Operating Systems
In-Reply-To: <3rl777-q1m2.ln1@ozzie.tundraware.com>
References: <fpc777-2iu1.ln1@ozzie.tundraware.com>	<mailman.921.1268845558.23598.python-list@python.org>
	<3rl777-q1m2.ln1@ozzie.tundraware.com>
Message-ID: <4BA134BD.8060704@timgolden.me.uk>

On 17/03/2010 19:07, Tim Daneliuk wrote:
> That's not really so. Windows definitely has the notions of users and groups,
> they just don't quite align with the POSIX model exactly.

Yes, my comment was a little blase. I know that Windows has users & groups:

http://timgolden.me.uk/python/win32_how_do_i/get-the-owner-of-a-file.html

:)

I was thinking that you wanted a naive transfer of the Posix concept.
The "owner" of a file does mean something to Windows (while the "group"
really doesn't; it's just an artefact of Windows' posix-compatibility)
but not as much as it does on Posix systems, because the security system
is much more sophisticated.

But maybe I'm teaching my grandmother to suck eggs ?

TJG


From tjreedy at udel.edu  Wed Mar 17 16:12:11 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 17 Mar 2010 16:12:11 -0400
Subject: Python bindings tutorial
In-Reply-To: <hnqhao$o9m$1@dough.gmane.org>
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>	<mailman.863.1268766752.23598.python-list@python.org>	<98447f7e-64db-4a10-b19e-685f5b079cf6@l25g2000yqd.googlegroups.com>	<hnq7qt$kl0$1@dough.gmane.org>	<4BA0B985.3060501@ieee.org>
	<hnqhao$o9m$1@dough.gmane.org>
Message-ID: <hnrd2s$e92$1@dough.gmane.org>

On 3/17/2010 8:18 AM, Stefan Behnel wrote:
> Dave Angel, 17.03.2010 12:14:
>> Stefan Behnel wrote:
>>> I think the point here is that executable binaries are not supposed to
>>> be used as libraries. Libraries are. That's the difference between a
>>> DLL and an executable in the first place. To run an executable,
>>> execute it. The subprocess module is the tool of choice here. To use a
>>> DLL, link against it.
>>>
>> There's no real reason parts of an exe cannot be exported, same as a
>> dll. They are in fact the same structure. And in fact many other files
>> in the Windows environment are also the same structure, from fonts to
>> ocx's
>
> So, because you can, you'd also try to link against fonts then, I guess?
>
> I hope you notice that what you and me said isn't contradictory. But
> there's a reason why there are libraries and executables, and there's no
> reason you *should* export anything from an executable - that's what
> libraries are there for. That's my point.

To put it another way, if an executable has functions that could/should 
be available as 'library' functions, then they can/should be put in a 
separate library file for use as such and called from a smaller .exe.

This is what python itself does. For 3.1 on winxp, python.exe is only 26 
Kb, while python31.dll, with all the builtin functions and classes, (in 
windows/system32) is 2072 KB.
>
> Besides, nothing guarantees that it's safe to call stuff that an
> executable exports. The executable may well require some setup code that
> it only executes when it is properly started.

Terry Jan Reedy



From tjreedy at udel.edu  Wed Mar 17 16:21:08 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 17 Mar 2010 16:21:08 -0400
Subject: question about tkinter
In-Reply-To: <CD942CDF-0D69-421E-8047-6EDFC7274873@haystack.mit.edu>
References: <mailman.903.1268829586.23598.python-list@python.org>	<hnqjoo$g4o$02$1@news.t-online.com>	<mailman.906.1268832771.23598.python-list@python.org>	<hnqn7l$645$03$1@news.t-online.com>
	<CD942CDF-0D69-421E-8047-6EDFC7274873@haystack.mit.edu>
Message-ID: <hnrdjm$gdj$1@dough.gmane.org>

On 3/17/2010 10:33 AM, robert schaefer wrote:
> No, And there's a reason (perhaps not a great one - but I'm got some constraints).

>   Related to that I tailored Ipython to work with gtk (ipython's default was tkinter) - tailoring was by a command
> - is there any way to command idle to use gtk?

I am pretty sure not, the gui is hard-coded with tkinter.



From tjreedy at udel.edu  Wed Mar 17 16:29:02 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 17 Mar 2010 16:29:02 -0400
Subject: Nested Scopes unintended behaviour ?
In-Reply-To: <hnqtbp$bbb$1@dough.gmane.org>
References: <7a110632-d6c5-446b-a34b-95548fadb2f9@r27g2000yqn.googlegroups.com>
	<hnqtbp$bbb$1@dough.gmane.org>
Message-ID: <hnre2f$i2u$1@dough.gmane.org>

On 3/17/2010 11:44 AM, Emile van Sebille wrote:
> On 3/17/2010 8:16 AM Michael Sparks said...
>> Hi,
>>
>>
>> Is the following behaviour expected ?
>
> In short, yes. Assignment within a function forces the variable to
> locals.

In 3.x, one can declare names to be nonlocal (ie, local to some outer 
function, as opposed to local to the current function or module global).
In your case,
   nonlocal on
in your inner swtchfun function would give the behavior you wanted.

Terry Jan Reedy




From python at bdurham.com  Wed Mar 17 16:31:39 2010
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 17 Mar 2010 16:31:39 -0400
Subject: Converting Python CGI to WSGI scripts
In-Reply-To: <4ba0735b$0$1594$742ec2ed@news.sonic.net>
References: <1268759895.28810.1365130739@webmail.messagingengine.com><mailman.882.1268803376.23598.python-list@python.org>
	<4ba0735b$0$1594$742ec2ed@news.sonic.net>
Message-ID: <1268857899.13963.1365364051@webmail.messagingengine.com>

Sebastian/John,

Thank you very much for your feedback. 

John: I initially missed the nuance of WSGI scripts being function
calls. I suspect your tip has saved me a lot of pain :)

Regards,

Malcolm


From tundra at tundraware.com  Wed Mar 17 16:43:15 2010
From: tundra at tundraware.com (Tim Daneliuk)
Date: Wed, 17 Mar 2010 15:43:15 -0500
Subject: Win32All On 64-Bit Operating Systems
In-Reply-To: <mailman.926.1268856005.23598.python-list@python.org>
References: <fpc777-2iu1.ln1@ozzie.tundraware.com>	<mailman.921.1268845558.23598.python-list@python.org>	<3rl777-q1m2.ln1@ozzie.tundraware.com>
	<mailman.926.1268856005.23598.python-list@python.org>
Message-ID: <4fr777-43o2.ln1@ozzie.tundraware.com>

On 3/17/2010 2:59 PM, Tim Golden wrote:
> On 17/03/2010 19:07, Tim Daneliuk wrote:
>> That's not really so. Windows definitely has the notions of users and
>> groups,
>> they just don't quite align with the POSIX model exactly.
> 
> Yes, my comment was a little blase. I know that Windows has users & groups:
> 
> http://timgolden.me.uk/python/win32_how_do_i/get-the-owner-of-a-file.html
> 
> :)
> 
> I was thinking that you wanted a naive transfer of the Posix concept.
> The "owner" of a file does mean something to Windows (while the "group"
> really doesn't; it's just an artefact of Windows' posix-compatibility)
> but not as much as it does on Posix systems, because the security system
> is much more sophisticated.
> 
> But maybe I'm teaching my grandmother to suck eggs ?
> 
> TJG

Naw.  The intent is just to provide as similar as possible a user experience.
>From a coding POV, it is surely simpler to just use 'winuser' and 'wingroup',
but I am sort of philosophically wired to not throw information away if
it's a available from the OS.

BTW, wanna beta test a really cool CLI mass file renaming tool????? ;)

-- 
----------------------------------------------------------------------------
Tim Daneliuk     tundra at tundraware.com
PGP Key:         http://www.tundraware.com/PGP/



From pmaupin at gmail.com  Wed Mar 17 17:21:44 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Wed, 17 Mar 2010 14:21:44 -0700 (PDT)
Subject: to pass self or not to pass self
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org> 
	<4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com> 
	<mailman.925.1268855759.23598.python-list@python.org>
Message-ID: <b9e5729e-01f6-430d-8748-7cc7d115fc50@g19g2000yqe.googlegroups.com>

On Mar 17, 2:55?pm, Terry Reedy <tjre... at udel.edu> wrote:
> On 3/17/2010 1:35 AM, Patrick Maupin wrote:
>
> >>>> def a(s, count, lenfunc):
> > ... ? ? for i in xrange(count):
> > ... ? ? ? ?z = lenfunc(s)
> > ...
> >>>> >>> ?a('abcdef', 100000000, len)
> >>>> >>> ?a('abcdef', 100000000, str.__len__)
> > Running cPython 2.6 on my machine, len() runs about 3 times faster
> > than str.__len__(). ?The overhead of checking that an object is usable
> > with a particular class method far outweighs the cost of creating the
> > bound method!
>
> Wow, this so surprised me, that I had to try it with 3.1 (on winxp), and
> got a similar result (about 2.6x longer with str.__len__). This is a
> real lesson in measure, don't guess, and how premature 'optimization'
> may be a pessimization. Thanks.
>
> Terry Jan Reedy

Actually, I think I overstated my case -- there is some special logic
for len and built-in objects, I think.   I can see the same thing with
normal attributes on subclasses of object(), but not nearly as
dramatic.  In any case, your conclusion about this being a lesson in
"measure, don't guess" holds, with the additional caveat that, if it
matters, you need to somehow do some additional measurements to make
sure you are measuring what you think you are measuring!

Pat


From tundra at tundraware.com  Wed Mar 17 17:30:19 2010
From: tundra at tundraware.com (Tim Daneliuk)
Date: Wed, 17 Mar 2010 16:30:19 -0500
Subject: What Does sys.platform Return On 64 Bit Windows Systems?
Message-ID: <c7u777-j5p2.ln1@ozzie.tundraware.com>

On older 32 bit Windows systems, sys.platform returns:  'win32'

What does it return on 64-bit Windows systems?  I'd check myself, but
I don't have access to 64-bit Windows.

TIA,

-- 
----------------------------------------------------------------------------
Tim Daneliuk     tundra at tundraware.com
PGP Key:         http://www.tundraware.com/PGP/



From gagsl-py2 at yahoo.com.ar  Wed Mar 17 17:37:24 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 17 Mar 2010 18:37:24 -0300
Subject: bug in bdist_wininst cross compile?
References: <4BA0E958.8050205@chamonix.reportlab.co.uk>
Message-ID: <op.u9qecmi2x6zn5v@lepton.softlabbsas.com.ar>

En Wed, 17 Mar 2010 11:38:16 -0300, Robin Becker <robin at reportlab.com>  
escribi?:

> has anyone had any success with cross compilation and bdist_wininst; I  
> have modified build_ext very slightly to fix a small bug in cross  
> compilation related to library order.

Please post your bug report + patch at http://bugs.python.org or it will  
be lost.

-- 
Gabriel Genellina



From keirvt at gmail.com  Wed Mar 17 18:04:14 2010
From: keirvt at gmail.com (Keir Vaughan-taylor)
Date: Wed, 17 Mar 2010 15:04:14 -0700 (PDT)
Subject: os.walk restart
Message-ID: <a8c1c0df-cbfa-421c-a869-9f4c555a80ac@l11g2000pro.googlegroups.com>

I am traversing a large set of directories using

for root, dirs, files in os.walk(basedir):
    run program

Being a huge directory set the traversal is taking days to do a
traversal.
Sometimes it is the case there is a crash because of a programming
error.
As each directory is processed the name of the directory is written to
a file
I want to be able to restart the walk from the directory where it
crashed.

Is this possible?


From gatoygata2 at gmail.com  Wed Mar 17 18:34:53 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Wed, 17 Mar 2010 15:34:53 -0700 (PDT)
Subject: to pass self or not to pass self
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org> 
	<4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com> 
	<4ba09d09$0$21466$426a74cc@news.free.fr>
	<503dc9c5-e1ce-4b33-aff4-ee9677839fe0@33g2000yqj.googlegroups.com>
Message-ID: <c51f1be4-1a78-42cb-8335-3bf24e426238@upsg2000gro.googlegroups.com>

On Mar 17, 3:43?pm, Patrick Maupin <pmau... at gmail.com> wrote:
> On Mar 17, 4:12?am, Bruno Desthuilliers <bruno.
>
> 42.desthuilli... at websiteburo.invalid> wrote:
> > Patrick Maupin a ?crit :
>
> > > On Mar 16, 1:59 pm, Jason Tackaberry <t... at urandom.ca> wrote:
> > >> Why not create the bound methods at instantiation time, rather than
> > >> using the descriptor protocol which has the overhead of creating a new
> > >> bound method each time the method attribute is accessed?
>
> > > Well, for one thing, Python classes are open. ?They can be added to at
> > > any time. ?For another thing, you might not ever use most of the
> > > methods of an instance, so it would be a huge waste to create those.
>
> > A possible optimization would be a simple memoization on first access.
>
> I do agree that memoization on access is a good pattern, and I use it
> frequently. ?I don't know if I would want the interpreter
> automagically doing that for everything, though -- it would require
> some thought to figure out what the overhead cost is for the things
> that are only used once.
>
> Usually, I will have a slight naming difference for the things I want
> memoized, to get the memoization code to run. ?For example, if you add
> an underbar in front of everything you want memoized:
>
> class foo(object):
>
> ? ? def _bar(self):
> ? ? ? ? pass
>
> ? ? def __getattr__(self, aname):
> ? ? ? ? if aname.startswith('_'):
> ? ? ? ? ? ? raise AttributeError
> ? ? ? ? value = getattr(self, '_' + aname)
> ? ? ? ? self.aname = value
> ? ? ? ? return value
>
> obj = foo()
>
> So then the first time you look up obj.bar, it builds the bound
> method, and on subsequent accesses it just returns the previously
> bound method.
>
> Regards,
> Pat

Patrick, I was trying to understand the way your code was working but
I thing I'm not getting it.

I tested:

from time import time

class foo1(object):
    def _bar(self):
	pass
    def __getattr__(self, name):
	value = getattr(self, '_' + name)
	self.name = value
	return value

class foo2(object):
    def bar(self):
	pass

def a(klass, count):
    ins = klass()
    for i in xrange(count):
        z = ins.bar()

t0 = time()
a(foo1,  10000000)
t1 = time()
a(foo2, 10000000)
t2 = time()

print t1-t0   #75 sec
print t2-t1   #11 sec

foo1 is a lot slower than foo2. I understood that memoization should
optimize atribute calls. Maybe I am putting my foot in my mouth...

Thanks
JA


From googler.1.webmaster at spamgourmet.com  Wed Mar 17 18:35:06 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Wed, 17 Mar 2010 15:35:06 -0700 (PDT)
Subject: C-API PyObject_Call
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
	<mailman.849.1268756405.23598.python-list@python.org>
	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>
	<mailman.858.1268759662.23598.python-list@python.org>
	<c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>
	<mailman.883.1268808393.23598.python-list@python.org>
Message-ID: <3592cca0-2a4a-4a19-9e10-d80936e6d200@upsg2000gro.googlegroups.com>

> 1) put the line number information into the message string when you raise
> the exception


you mean the line and file information of the C code, right?


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 17 18:38:21 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 17 Mar 2010 22:38:21 GMT
Subject: Swapping Content of Two Dictionaries.
References: <779ea7fb1003160146t6fe79d6erc6dc12ea7452f6b3@mail.gmail.com>
	<779ea7fb1003170426o3dff6f06lade4b90c6a81f265@mail.gmail.com>
	<mailman.902.1268829286.23598.python-list@python.org>
Message-ID: <pan.2010.03.17.22.38.21@REMOVE.THIS.cybersource.com.au>

On Wed, 17 Mar 2010 13:34:51 +0100, Peter Otten wrote:

> Hatem Oraby wrote:
> 
>> Hello, I want to swap the content of two dictionaries, the obvious way
>> to do it is:
>> a = {1:"I'am A"}
>> b = {2:"I'm B"}
>> temp = a
>> a = b
>> b = temp
> 
> That can be simplified to
> 
> a, b = b, a
> 
> and is almost certainly the right approach.


Unfortunately, it may not, because it doesn't swap the content of two 
dictionaries (as asked for), but instead swaps the dictionaries bound to 
two names, which is a very different kettle of fish indeed.

It may be that the OP's description of his problem is inaccurate, in 
which case a simple re-binding is the easiest way, but if the subject 
line is accurate, then he needs your suggested solution using a temporary 
dict, clear and update. Wrap it in a function, and you have a one-liner 
swap operation :)



-- 
Steven


From gagsl-py2 at yahoo.com.ar  Wed Mar 17 18:39:45 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 17 Mar 2010 19:39:45 -0300
Subject: How to access a web site with an authentication template.
References: <4BA122B4.5030003@bluewin.ch>
Message-ID: <op.u9qg8jr6x6zn5v@lepton.softlabbsas.com.ar>

En Wed, 17 Mar 2010 15:43:00 -0300, Anthra Norell  
<anthra.norell at bluewin.ch> escribi?:

> I understand that I can access password protected sites with urllib2. 
> [...] a site I am dealing with, because the opening page does not  
> require a password. It presents an id/password entry template and I have  
> no clue how to respond in python. The page source is chock full of java  
> script.

Use an HTTP sniffer (there are plenty) to see the actual request that is  
sent to the server. Then emulate it using urllib2.

-- 
Gabriel Genellina



From david at boddie.org.uk  Wed Mar 17 18:40:43 2010
From: david at boddie.org.uk (David Boddie)
Date: Wed, 17 Mar 2010 23:40:43 +0100
Subject: highlight words by regex in pdf files using python
References: <af0830ae-1d24-4db9-b721-d6602fedd540@15g2000yqi.googlegroups.com>
	<hnp5at$eig$1@panix5.panix.com>
Message-ID: <hnrlpb$75g$1@get-news01.get.basefarm.net>

On Wednesday 17 March 2010 00:47, Aahz wrote:

> In article
> <af0830ae-1d24-4db9-b721-d6602fedd540 at 15g2000yqi.googlegroups.com>,
> Peng Yu  <pengyu.ut at gmail.com> wrote:
>>
>>I don't find a general pdf library in python that can do any
>>operations on pdfs.
>>
>>I want to automatically highlight certain words (using regex) in a
>>pdf. Could somebody let me know if there is a tool to do so in python?
> 
> Did you Google at all?  "python pdf" finds this as the first link, though
> I have no clue whether it does what you want:
> 
> http://pybrary.net/pyPdf/

The original poster might also be interested in displaying the highlighted
words without modifying the original file. In which case, the Poppler
library is worth investigating:

  http://poppler.freedesktop.org/

David


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 17 18:42:35 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 17 Mar 2010 22:42:35 GMT
Subject: os.walk restart
References: <a8c1c0df-cbfa-421c-a869-9f4c555a80ac@l11g2000pro.googlegroups.com>
Message-ID: <pan.2010.03.17.22.42.34@REMOVE.THIS.cybersource.com.au>

On Wed, 17 Mar 2010 15:04:14 -0700, Keir Vaughan-taylor wrote:

> I am traversing a large set of directories using
> 
> for root, dirs, files in os.walk(basedir):
>     run program
> 
> Being a huge directory set the traversal is taking days to do a
> traversal.
> Sometimes it is the case there is a crash because of a programming
> error.
> As each directory is processed the name of the directory is written to a
> file

What, a proper, honest-to-goodness core dump?

Or do you mean an exception?


> I want to be able to restart the walk from the directory where it
> crashed.
> 
> Is this possible?


Quick and dirty with no error-checking:


# Untested
last_visited = open("last_visited.txt", 'r').read()
for root, dirs, files in os.walk(last_visited or basedir):
     open("last_visited.txt", 'w').write(root)
     run program




-- 
Steven


From news1234 at free.fr  Wed Mar 17 18:47:41 2010
From: news1234 at free.fr (News123)
Date: Wed, 17 Mar 2010 23:47:41 +0100
Subject: url2lib (windows 7) does not notice when network reconnects
	(getaddrinfo problem)
Message-ID: <4ba15c0d$0$15456$426a74cc@news.free.fr>

Hi,


I'd like to write a function, that knows when the 'internet' is reachable.

My setup is a windows7 host with a wireless USB modem. The modem might
connect / disconnect any time.

I thought I write a small function just checking whether I can fetch a url.
######### script starts
import time,urllib2

myurl = "http://www.mysite.com" # or "www.google.com" or whatever you like

while True:
    connected = False
    try:
        urllib2.urlopen(myurl)
        connected = True
    except urllib2.URLError as e:
        print "urlerr %s" % e
    print "connected",connected
    time.sleep(1)
########## end of script

if the network is connected when I start the script the first time after
reboot, then  I receive
> connected True
As expected

If the network is disconnected when I start the script the first time
after reboot, then  I receive
> urlerr <urlopen error [Errno 11004] getaddrinfo failed>
> connected False
as expected

Things are getting weired, when my USB wireless modem connects after
I started my script:

It happens, that I just continue to receive:
> urlerr <urlopen error [Errno 11004] getaddrinfo failed>
> connected False

however when I use a windows cmd window and I start
"ping www.mysite.com", then my python script recovers and reports
> connected True

My perhaps false conclusion is, that getaddrinfo() is not retrying to
resolve an IP address, when it failed once.

Is this behaviour known? Can this really be possible?
I can reproduce this issue. not every time, but rather often.

If yes, is there any way to force a new host name lookup under windows?


What else could I be doing wrong?


Thanks a lot in advance for any ideas


N
















	


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 17 18:49:20 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 17 Mar 2010 22:49:20 GMT
Subject: What Does sys.platform Return On 64 Bit Windows Systems?
References: <c7u777-j5p2.ln1@ozzie.tundraware.com>
Message-ID: <pan.2010.03.17.22.49.18@REMOVE.THIS.cybersource.com.au>

On Wed, 17 Mar 2010 16:30:19 -0500, Tim Daneliuk wrote:

> On older 32 bit Windows systems, sys.platform returns:  'win32'
> 
> What does it return on 64-bit Windows systems?  I'd check myself, but I
> don't have access to 64-bit Windows.

According to the docs, it returns win32:

http://docs.python.org/library/sys.html

If anyone knows different, this should be reported as a documentation 
bug. But 30 seconds of googling suggests that sys.platform is 'win32' 
even on 64-bit builds of Windows, by design:

http://stackoverflow.com/questions/2144748/is-it-safe-to-use-sys-platformwin32-check-on-64-bit-python



-- 
Steven


From gagsl-py2 at yahoo.com.ar  Wed Mar 17 19:09:28 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 17 Mar 2010 20:09:28 -0300
Subject: os.walk restart
References: <a8c1c0df-cbfa-421c-a869-9f4c555a80ac@l11g2000pro.googlegroups.com>
Message-ID: <op.u9qil2i0x6zn5v@lepton.softlabbsas.com.ar>

En Wed, 17 Mar 2010 19:04:14 -0300, Keir Vaughan-taylor <keirvt at gmail.com>  
escribi?:

> I am traversing a large set of directories using
>
> for root, dirs, files in os.walk(basedir):
>     run program
>
> Being a huge directory set the traversal is taking days to do a
> traversal.
> Sometimes it is the case there is a crash because of a programming
> error.
> As each directory is processed the name of the directory is written to
> a file
> I want to be able to restart the walk from the directory where it
> crashed.
>
> Is this possible?

If the 'dirs' list were guaranteed to be sorted, you could remove at each  
level all previous directories already traversed. But it's not :(

Perhaps a better approach would be, once, collect all directories to be  
processed and write them on a text file -- these are the pending  
directories. Then, read from the pending file and process every directory  
in it. If the process aborts for any reason, manually delete the lines  
already processed and restart.

If you use a database instead of a text file, and mark entries as "done"  
after processing, you can avoid that last manual step and the whole  
process may be kept running automatically. In some cases you may want to  
choose the starting point at random.

-- 
Gabriel Genellina



From pmaupin at gmail.com  Wed Mar 17 19:11:42 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Wed, 17 Mar 2010 16:11:42 -0700 (PDT)
Subject: to pass self or not to pass self
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org> 
	<4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com> 
	<4ba09d09$0$21466$426a74cc@news.free.fr>
	<503dc9c5-e1ce-4b33-aff4-ee9677839fe0@33g2000yqj.googlegroups.com>
	<c51f1be4-1a78-42cb-8335-3bf24e426238@upsg2000gro.googlegroups.com>
Message-ID: <0314849c-f748-4989-ae91-4dd42c95c251@q21g2000yqm.googlegroups.com>

On Mar 17, 5:34?pm, Joaquin Abian <gatoyga... at gmail.com> wrote:
> On Mar 17, 3:43?pm, Patrick Maupin <pmau... at gmail.com> wrote:
>
>
>
> > On Mar 17, 4:12?am, Bruno Desthuilliers <bruno.
>
> > 42.desthuilli... at websiteburo.invalid> wrote:
> > > Patrick Maupin a ?crit :
>
> > > > On Mar 16, 1:59 pm, Jason Tackaberry <t... at urandom.ca> wrote:
> > > >> Why not create the bound methods at instantiation time, rather than
> > > >> using the descriptor protocol which has the overhead of creating a new
> > > >> bound method each time the method attribute is accessed?
>
> > > > Well, for one thing, Python classes are open. ?They can be added to at
> > > > any time. ?For another thing, you might not ever use most of the
> > > > methods of an instance, so it would be a huge waste to create those.
>
> > > A possible optimization would be a simple memoization on first access.
>
> > I do agree that memoization on access is a good pattern, and I use it
> > frequently. ?I don't know if I would want the interpreter
> > automagically doing that for everything, though -- it would require
> > some thought to figure out what the overhead cost is for the things
> > that are only used once.
>
> > Usually, I will have a slight naming difference for the things I want
> > memoized, to get the memoization code to run. ?For example, if you add
> > an underbar in front of everything you want memoized:
>
> > class foo(object):
>
> > ? ? def _bar(self):
> > ? ? ? ? pass
>
> > ? ? def __getattr__(self, aname):
> > ? ? ? ? if aname.startswith('_'):
> > ? ? ? ? ? ? raise AttributeError
> > ? ? ? ? value = getattr(self, '_' + aname)
> > ? ? ? ? self.aname = value
> > ? ? ? ? return value
>
> > obj = foo()
>
> > So then the first time you look up obj.bar, it builds the bound
> > method, and on subsequent accesses it just returns the previously
> > bound method.
>
> > Regards,
> > Pat
>
> Patrick, I was trying to understand the way your code was working but
> I thing I'm not getting it.
>
> I tested:
>
> from time import time
>
> class foo1(object):
> ? ? def _bar(self):
> ? ? ? ? pass
> ? ? def __getattr__(self, name):
> ? ? ? ? value = getattr(self, '_' + name)
> ? ? ? ? self.name = value
> ? ? ? ? return value
>
> class foo2(object):
> ? ? def bar(self):
> ? ? ? ? pass
>
> def a(klass, count):
> ? ? ins = klass()
> ? ? for i in xrange(count):
> ? ? ? ? z = ins.bar()
>
> t0 = time()
> a(foo1, ?10000000)
> t1 = time()
> a(foo2, 10000000)
> t2 = time()
>
> print t1-t0 ? #75 sec
> print t2-t1 ? #11 sec
>
> foo1 is a lot slower than foo2. I understood that memoization should
> optimize atribute calls. Maybe I am putting my foot in my mouth...
>
> Thanks
> JA

I don't think you are putting your foot in your mouth.  I always have
to test to remember what works faster and what doesn't.  Usually when
I memoize as I showed, it is not a simple attribute lookup, but
something that takes more work to create.  As I stated in my response
to Terry, I overstated my case earlier, because of some optimizations
in len(), I think.  Nonetheless, (at least on Python 2.6) I think the
advice I gave to the OP holds.  One difference is that you are doing
an attribute lookup in your inner loop.  I do find that performance
hit surprising, but to compare with what the OP is describing, you
either need to look up an unbound function in a dict and call it with
a parameter, or look up a bound method in a dict and call it without
the parameter.  Since the dict lookup doesn't usually do anything
fancy and unexpected like attribute lookup, we pull the dict lookup
out of the equation and out of the inner loop, and just do the
comparison like this:

>>> class foo(object):
...     def bar(self):
...         pass
...
>>> x = foo()
>>>
>>> def a(func, count):
...     for i in xrange(count):
...         z=func()
...
>>> def b(func, param, count):
...     for i in xrange(count):
...         z=func(param)
...
>>>
>>> a(x.bar,      100000000)  # 13 seconds
>>> b(foo.bar, x, 100000000)  # 18 seconds

Regards,
Pat


From lists at cheimes.de  Wed Mar 17 19:16:55 2010
From: lists at cheimes.de (Christian Heimes)
Date: Thu, 18 Mar 2010 00:16:55 +0100
Subject: What Does sys.platform Return On 64 Bit Windows Systems?
In-Reply-To: <c7u777-j5p2.ln1@ozzie.tundraware.com>
References: <c7u777-j5p2.ln1@ozzie.tundraware.com>
Message-ID: <4BA162E7.7000503@cheimes.de>

Tim Daneliuk schrieb:
> On older 32 bit Windows systems, sys.platform returns:  'win32'
> 
> What does it return on 64-bit Windows systems?  I'd check myself, but
> I don't have access to 64-bit Windows.

Do you want to know if the current build of Python is a 32 or 64bit build?

>>> import struct
>>> struct.calcsize("P") * 8
64

Christian


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 17 20:12:14 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 18 Mar 2010 00:12:14 GMT
Subject: class inheritance
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
	<9bb4c1e7-858e-4ee6-870b-5a6549b6c496@b36g2000pri.googlegroups.com>
	<05d0d40f-3fa0-4095-875d-777b49122d12@l12g2000prg.googlegroups.com>
Message-ID: <pan.2010.03.18.00.12.14@REMOVE.THIS.cybersource.com.au>

On Mon, 15 Mar 2010 16:34:35 -0700, JLundell wrote:

> It's also unfortunate that Python doesn't have an approximately-equal
> operator; it'd come in handy for floating-point applications while
> preserving hash. If only there were a ~= or ? operator I could overload.
> And ~ is unary, so no joy.

Not everything needs to be a built-in, or an operator. This might be 
useful for you:

http://code.activestate.com/recipes/577124-approximately-equal/


Feedback welcome.


-- 
Steven


From gatoygata2 at gmail.com  Wed Mar 17 20:55:41 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Wed, 17 Mar 2010 17:55:41 -0700 (PDT)
Subject: to pass self or not to pass self
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org> 
	<4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com> 
	<4ba09d09$0$21466$426a74cc@news.free.fr>
	<503dc9c5-e1ce-4b33-aff4-ee9677839fe0@33g2000yqj.googlegroups.com>
	<c51f1be4-1a78-42cb-8335-3bf24e426238@upsg2000gro.googlegroups.com> 
	<0314849c-f748-4989-ae91-4dd42c95c251@q21g2000yqm.googlegroups.com>
Message-ID: <bedfdbe1-2644-4716-9d39-974ab1e1e8b5@r1g2000yqj.googlegroups.com>

On Mar 18, 12:11?am, Patrick Maupin <pmau... at gmail.com> wrote:
> On Mar 17, 5:34?pm, Joaquin Abian <gatoyga... at gmail.com> wrote:
>
>
>
> > On Mar 17, 3:43?pm, Patrick Maupin <pmau... at gmail.com> wrote:
>
> > > On Mar 17, 4:12?am, Bruno Desthuilliers <bruno.
>
> > > 42.desthuilli... at websiteburo.invalid> wrote:
> > > > Patrick Maupin a ?crit :
>
> > > > > On Mar 16, 1:59 pm, Jason Tackaberry <t... at urandom.ca> wrote:
> > > > >> Why not create the bound methods at instantiation time, rather than
> > > > >> using the descriptor protocol which has the overhead of creating a new
> > > > >> bound method each time the method attribute is accessed?
>
> > > > > Well, for one thing, Python classes are open. ?They can be added to at
> > > > > any time. ?For another thing, you might not ever use most of the
> > > > > methods of an instance, so it would be a huge waste to create those.
>
> > > > A possible optimization would be a simple memoization on first access.
>
> > > I do agree that memoization on access is a good pattern, and I use it
> > > frequently. ?I don't know if I would want the interpreter
> > > automagically doing that for everything, though -- it would require
> > > some thought to figure out what the overhead cost is for the things
> > > that are only used once.
>
> > > Usually, I will have a slight naming difference for the things I want
> > > memoized, to get the memoization code to run. ?For example, if you add
> > > an underbar in front of everything you want memoized:
>
> > > class foo(object):
>
> > > ? ? def _bar(self):
> > > ? ? ? ? pass
>
> > > ? ? def __getattr__(self, aname):
> > > ? ? ? ? if aname.startswith('_'):
> > > ? ? ? ? ? ? raise AttributeError
> > > ? ? ? ? value = getattr(self, '_' + aname)
> > > ? ? ? ? self.aname = value
> > > ? ? ? ? return value
>
> > > obj = foo()
>
> > > So then the first time you look up obj.bar, it builds the bound
> > > method, and on subsequent accesses it just returns the previously
> > > bound method.
>
> > > Regards,
> > > Pat
>
> > Patrick, I was trying to understand the way your code was working but
> > I thing I'm not getting it.
>
> > I tested:
>
> > from time import time
>
> > class foo1(object):
> > ? ? def _bar(self):
> > ? ? ? ? pass
> > ? ? def __getattr__(self, name):
> > ? ? ? ? value = getattr(self, '_' + name)
> > ? ? ? ? self.name = value
> > ? ? ? ? return value
>
> > class foo2(object):
> > ? ? def bar(self):
> > ? ? ? ? pass
>
> > def a(klass, count):
> > ? ? ins = klass()
> > ? ? for i in xrange(count):
> > ? ? ? ? z = ins.bar()
>
> > t0 = time()
> > a(foo1, ?10000000)
> > t1 = time()
> > a(foo2, 10000000)
> > t2 = time()
>
> > print t1-t0 ? #75 sec
> > print t2-t1 ? #11 sec
>
> > foo1 is a lot slower than foo2. I understood that memoization should
> > optimize atribute calls. Maybe I am putting my foot in my mouth...
>
> > Thanks
> > JA
>
> I don't think you are putting your foot in your mouth. ?I always have
> to test to remember what works faster and what doesn't. ?Usually when
> I memoize as I showed, it is not a simple attribute lookup, but
> something that takes more work to create. ?As I stated in my response
> to Terry, I overstated my case earlier, because of some optimizations
> in len(), I think. ?Nonetheless, (at least on Python 2.6) I think the
> advice I gave to the OP holds. ?One difference is that you are doing
> an attribute lookup in your inner loop. ?I do find that performance
> hit surprising, but to compare with what the OP is describing, you
> either need to look up an unbound function in a dict and call it with
> a parameter, or look up a bound method in a dict and call it without
> the parameter. ?Since the dict lookup doesn't usually do anything
> fancy and unexpected like attribute lookup, we pull the dict lookup
> out of the equation and out of the inner loop, and just do the
> comparison like this:
>
> >>> class foo(object):
>
> ... ? ? def bar(self):
> ... ? ? ? ? pass
> ...>>> x = foo()
>
> >>> def a(func, count):
>
> ... ? ? for i in xrange(count):
> ... ? ? ? ? z=func()
> ...>>> def b(func, param, count):
>
> ... ? ? for i in xrange(count):
> ... ? ? ? ? z=func(param)
> ...
>
>
>
> >>> a(x.bar, ? ? ?100000000) ?# 13 seconds
> >>> b(foo.bar, x, 100000000) ?# 18 seconds
>
> Regards,
> Pat

OK, Thanks. Need to play a little bit with it.
Cheers
JA


From python at bdurham.com  Wed Mar 17 22:42:46 2010
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 17 Mar 2010 22:42:46 -0400
Subject: Possible to open a file for shared write mode under Windows?
Message-ID: <1268880166.3322.1365412149@webmail.messagingengine.com>

Is there a way to open a file for shared write mode under
Windows?

I have 2 processes that will write to different regions of this
shared file.

Thank you,
Malcolm
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From wuwei23 at gmail.com  Wed Mar 17 23:08:48 2010
From: wuwei23 at gmail.com (alex23)
Date: Wed, 17 Mar 2010 20:08:48 -0700 (PDT)
Subject: os.walk restart
References: <a8c1c0df-cbfa-421c-a869-9f4c555a80ac@l11g2000pro.googlegroups.com>
	<pan.2010.03.17.22.42.34@REMOVE.THIS.cybersource.com.au>
Message-ID: <92b42203-876f-4383-9af6-b0ed775c3d92@w9g2000prb.googlegroups.com>

Steven D'Aprano <ste... at REMOVE.THIS.cybersource.com.au> wrote:
> # Untested
> last_visited = open("last_visited.txt", 'r').read()
> for root, dirs, files in os.walk(last_visited or basedir):
> ? ? ?open("last_visited.txt", 'w').write(root)
> ? ? ?run program

Wouldn't this only walk the directory the exception occured in and not
the remaining unwalked dirs from basedir?

Something like this should work:

import os
basedir = '.'

walked = open('walked.txt','r').read().split()
unwalked = ((r,d,f) for r,d,f in os.walk(basedir) if r not in walked)

for root, dirs, files in unwalked:
  # do something
  print root
  walked.append(root)

open('walked.txt','w').write('\n'.join(walked))


From python at mrabarnett.plus.com  Wed Mar 17 23:34:46 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 18 Mar 2010 03:34:46 +0000
Subject: os.walk restart
In-Reply-To: <a8c1c0df-cbfa-421c-a869-9f4c555a80ac@l11g2000pro.googlegroups.com>
References: <a8c1c0df-cbfa-421c-a869-9f4c555a80ac@l11g2000pro.googlegroups.com>
Message-ID: <4BA19F56.4020302@mrabarnett.plus.com>

Keir Vaughan-taylor wrote:
> I am traversing a large set of directories using
> 
> for root, dirs, files in os.walk(basedir):
>     run program
> 
> Being a huge directory set the traversal is taking days to do a
> traversal.
> Sometimes it is the case there is a crash because of a programming
> error.
> As each directory is processed the name of the directory is written to
> a file
> I want to be able to restart the walk from the directory where it
> crashed.
> 
> Is this possible?

I would write my own walker which sorts the directory entries it finds
before walking them and can skip the entries until it gets to the
desired starting path, eg if I want to start at "/foo/bar" then skip
over the entries in the root directory which start with a name before
"foo" and the entries in the subdirectory "/foo" which start with a name
before "bar".


From showell30 at yahoo.com  Wed Mar 17 23:49:58 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Wed, 17 Mar 2010 20:49:58 -0700 (PDT)
Subject: os.walk restart
References: <a8c1c0df-cbfa-421c-a869-9f4c555a80ac@l11g2000pro.googlegroups.com>
Message-ID: <68cbed3c-87f6-45c9-ac8e-a536cae20f26@k6g2000prg.googlegroups.com>

On Mar 17, 3:04?pm, Keir Vaughan-taylor <kei... at gmail.com> wrote:
> I am traversing a large set of directories using
>
> for root, dirs, files in os.walk(basedir):
> ? ? run program
>
> Being a huge directory set the traversal is taking days to do a
> traversal.
> Sometimes it is the case there is a crash because of a programming
> error.
> As each directory is processed the name of the directory is written to
> a file
> I want to be able to restart the walk from the directory where it
> crashed.
>
> Is this possible?

I assume it's the operation that you are doing on each file that is
expensive, not the walk itself.

If that's the case, then you might be able to get away with just
leaving some kind of breadcrumbs whenever you've successfully
processed a directory or a file, so you can quickly short-circuit
entire directories or files on the next run, without having to
implement any kind of complicated start-where-I-left-off before
algorithm.

The breadcrumbs could be hidden files in the file system, or an easy-
indexable list of files that you persist, etc.

What are you doing that takes so long?

Also, I can understand why the operations on the files themselves
might crash, but can't you catch an exception and keep on chugging?

Another option, if you do not do some kind of pruning on the fly, is
to persist the list of files that you need to process up front to a
file, or a database, and persist the index of the last successfully
processed file, so that you can restart as needed from where you left
off.


From steven at REMOVE.THIS.cybersource.com.au  Thu Mar 18 00:04:46 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 18 Mar 2010 04:04:46 GMT
Subject: os.walk restart
References: <a8c1c0df-cbfa-421c-a869-9f4c555a80ac@l11g2000pro.googlegroups.com>
	<pan.2010.03.17.22.42.34@REMOVE.THIS.cybersource.com.au>
	<92b42203-876f-4383-9af6-b0ed775c3d92@w9g2000prb.googlegroups.com>
Message-ID: <pan.2010.03.18.04.04.46@REMOVE.THIS.cybersource.com.au>

On Wed, 17 Mar 2010 20:08:48 -0700, alex23 wrote:

> Steven D'Aprano <ste... at REMOVE.THIS.cybersource.com.au> wrote:
>> # Untested
>> last_visited = open("last_visited.txt", 'r').read()
>> for root, dirs, files in os.walk(last_visited or basedir):
>> ? ? ?open("last_visited.txt", 'w').write(root) run program
> 
> Wouldn't this only walk the directory the exception occured in and not
> the remaining unwalked dirs from basedir?

Only if you have some sort of branching file hierarchy with multiple sub-
directories in the one directory, instead of a nice simple linear chain 
of directories a/b/c/d/.../z as nature intended.

*wink*

Yes, good catch. I said it was untested. You might be able to save the 
parent of the current directory, and restart from there instead.


-- 
Steven


From gagsl-py2 at yahoo.com.ar  Thu Mar 18 00:20:31 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 18 Mar 2010 01:20:31 -0300
Subject: Possible to open a file for shared write mode under Windows?
References: <1268880166.3322.1365412149@webmail.messagingengine.com>
Message-ID: <op.u9qw0h1ex6zn5v@lepton.softlabbsas.com.ar>

En Wed, 17 Mar 2010 23:42:46 -0300, <python at bdurham.com> escribi?:

> Is there a way to open a file for shared write mode under
> Windows?
>
> I have 2 processes that will write to different regions of this
> shared file.

Using the pywin32 package at sourceforge, you have access to the  
CreateFile function:  
http://msdn.microsoft.com/en-us/library/aa363858(v=VS.85).aspx
You want dwShareMode=FILE_SHARE_WRITE

-- 
Gabriel Genellina



From sccolbert at gmail.com  Thu Mar 18 00:38:56 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Thu, 18 Mar 2010 00:38:56 -0400
Subject: Possible to open a file for shared write mode under Windows?
In-Reply-To: <op.u9qw0h1ex6zn5v@lepton.softlabbsas.com.ar>
References: <1268880166.3322.1365412149@webmail.messagingengine.com>
	<op.u9qw0h1ex6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <7f014ea61003172138x6482aa87v50c865cb4e51eba5@mail.gmail.com>

you could also just have one process do the writing for both processes via
pipes.

On Thu, Mar 18, 2010 at 12:20 AM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar>wrote:

> En Wed, 17 Mar 2010 23:42:46 -0300, <python at bdurham.com> escribi?:
>
>
>  Is there a way to open a file for shared write mode under
>> Windows?
>>
>> I have 2 processes that will write to different regions of this
>> shared file.
>>
>
> Using the pywin32 package at sourceforge, you have access to the CreateFile
> function: http://msdn.microsoft.com/en-us/library/aa363858(v=VS.85).aspx
> You want dwShareMode=FILE_SHARE_WRITE
>
> --
> Gabriel Genellina
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From steve at holdenweb.com  Thu Mar 18 00:52:28 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 18 Mar 2010 00:52:28 -0400
Subject: Possible to open a file for shared write mode under Windows?
In-Reply-To: <7f014ea61003172138x6482aa87v50c865cb4e51eba5@mail.gmail.com>
References: <1268880166.3322.1365412149@webmail.messagingengine.com>	<op.u9qw0h1ex6zn5v@lepton.softlabbsas.com.ar>
	<7f014ea61003172138x6482aa87v50c865cb4e51eba5@mail.gmail.com>
Message-ID: <hnsbin$5ak$1@dough.gmane.org>

Chris Colbert wrote:
[top-posting switched to bottom-posting]
> 
> On Thu, Mar 18, 2010 at 12:20 AM, Gabriel Genellina
> <gagsl-py2 at yahoo.com.ar <mailto:gagsl-py2 at yahoo.com.ar>> wrote:
> 
>     En Wed, 17 Mar 2010 23:42:46 -0300, <python at bdurham.com
>     <mailto:python at bdurham.com>> escribi?:
> 
> 
>         Is there a way to open a file for shared write mode under
>         Windows?
> 
>         I have 2 processes that will write to different regions of this
>         shared file.
> 
> 
>     Using the pywin32 package at sourceforge, you have access to the
>     CreateFile function:
>     http://msdn.microsoft.com/en-us/library/aa363858(v=VS.85).aspx
>     You want dwShareMode=FILE_SHARE_WRITE
> 
> you could also just have one process do the writing for both processes
> via pipes.

You could, but then you'd have to work out how to avoid blocking on one
pipe when data was available form the other. Or is this trivially easy,
and I just don't know enough about pipes?

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From python at bdurham.com  Thu Mar 18 01:15:50 2010
From: python at bdurham.com (python at bdurham.com)
Date: Thu, 18 Mar 2010 01:15:50 -0400
Subject: Possible to open a file for shared write mode under Windows?
In-Reply-To: <op.u9qw0h1ex6zn5v@lepton.softlabbsas.com.ar>
References: <1268880166.3322.1365412149@webmail.messagingengine.com>
	<op.u9qw0h1ex6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <1268889350.21982.1365426663@webmail.messagingengine.com>

Hi Gabriel,

> Using the pywin32 package at sourceforge, you have access to the CreateFile function:  
> http://msdn.microsoft.com/en-us/library/aa363858(v=VS.85).aspx
> You want dwShareMode=FILE_SHARE_WRITE

Thanks - that was exactly what I was looking for.

Regards,
Malcolm


From sccolbert at gmail.com  Thu Mar 18 01:31:33 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Thu, 18 Mar 2010 01:31:33 -0400
Subject: Possible to open a file for shared write mode under Windows?
In-Reply-To: <hnsbin$5ak$1@dough.gmane.org>
References: <1268880166.3322.1365412149@webmail.messagingengine.com>
	<op.u9qw0h1ex6zn5v@lepton.softlabbsas.com.ar>
	<7f014ea61003172138x6482aa87v50c865cb4e51eba5@mail.gmail.com>
	<hnsbin$5ak$1@dough.gmane.org>
Message-ID: <7f014ea61003172231m60ec154rda99c31c06d82eb6@mail.gmail.com>

It's not too difficult:

# subp.py

import sys
import time

for i in range(10):
    sys.stdout.write('I am subprocess\n')
    sys.stdout.flush()  # this may not be necessary
    time.sleep(1)

# writer.py

import subprocess
import time

subp = subprocess.Popen(['/usr/bin/python', '-u', './subp.py'],
stdout=subprocess.PIPE)

while True:
    time.sleep(1)
    print('I am main process.') # write this to one section of the file

    if subp.poll() != None: # the subprocess has terminated
        break

    stdout = subp.stdout.readline()
    print(stdout) # write this to the other section



brucewayne at broo:~/Documents$ python ./writer.py
I am main process.
I am subprocess

I am main process.
I am subprocess

I am main process.
I am subprocess

I am main process.
I am subprocess

I am main process.
I am subprocess

I am main process.
I am subprocess

I am main process.
I am subprocess

I am main process.
I am subprocess

I am main process.
I am subprocess

I am main process.
I am subprocess

I am main process.



On Thu, Mar 18, 2010 at 12:52 AM, Steve Holden <steve at holdenweb.com> wrote:

> Chris Colbert wrote:
> [top-posting switched to bottom-posting]
> >
> > On Thu, Mar 18, 2010 at 12:20 AM, Gabriel Genellina
> > <gagsl-py2 at yahoo.com.ar <mailto:gagsl-py2 at yahoo.com.ar>> wrote:
> >
> >     En Wed, 17 Mar 2010 23:42:46 -0300, <python at bdurham.com
> >     <mailto:python at bdurham.com>> escribi?:
> >
> >
> >         Is there a way to open a file for shared write mode under
> >         Windows?
> >
> >         I have 2 processes that will write to different regions of this
> >         shared file.
> >
> >
> >     Using the pywin32 package at sourceforge, you have access to the
> >     CreateFile function:
> >     http://msdn.microsoft.com/en-us/library/aa363858(v=VS.85).aspx
> >     You want dwShareMode=FILE_SHARE_WRITE
> >
> > you could also just have one process do the writing for both processes
> > via pipes.
>
> You could, but then you'd have to work out how to avoid blocking on one
> pipe when data was available form the other. Or is this trivially easy,
> and I just don't know enough about pipes?
>
> regards
>  Steve
> --
> Steve Holden           +1 571 484 6266   +1 800 494 3119
> See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
> Holden Web LLC                 http://www.holdenweb.com/
> UPCOMING EVENTS:        http://holdenweb.eventbrite.com/
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From steven at REMOVE.THIS.cybersource.com.au  Thu Mar 18 01:52:14 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 18 Mar 2010 05:52:14 GMT
Subject: Understanding the CPython dict implementation
References: <mailman.768.1268610003.23598.python-list@python.org>
	<4b9f6fab$0$27822$c3e8da3@news.astraweb.com>
	<mailman.866.1268769875.23598.python-list@python.org>
Message-ID: <pan.2010.03.18.05.52.10@REMOVE.THIS.cybersource.com.au>

On Tue, 16 Mar 2010 16:04:22 -0400, Terry Reedy wrote:

> On 3/16/2010 7:46 AM, Steven D'Aprano wrote:
>> On Sun, 14 Mar 2010 19:39:46 -0400, Terry Reedy wrote:
>>
>>> I found this PyCon2010 presentation to be excellent: The Mighty
>>> Dictionary, Branden Craig Rhodes, 30 min.
> 
> Sorry,
> http://pycon.blip.tv/file/3332763/
> 
> which plays fine in FF3.6 on windows
> 
> 
>>> http://pycon.blip.tv/file/3264041/
> 
> wrong file number
> 
>> Unfortunately, that clip seems to be unwatchable, at least for me. It
>> crashed the Netscape plugin in Konqueror, and crashed Firefox.
> 
> The flash version does not work for me. This is true of about 1/3 of the
> Pycon 2010 videos that I have tried. The .ogv version of this and all
> others that I have tried (hit Download under Comments) plays fine within
> FF3.6 on my windows xp machine. Perhaps there is a linux-specific bug,
> if that is what you are running under.

Amusingly, the FLV files play perfectly for me under Linux, while the OGV 
files don't :)

Thanks for the links, the videos are very interesting.



-- 
Steven


From zubin.mithra at gmail.com  Thu Mar 18 02:28:53 2010
From: zubin.mithra at gmail.com (Zubin Mithra)
Date: Thu, 18 Mar 2010 11:58:53 +0530
Subject: D-Bus
Message-ID: <8e7c74321003172328s2f22ae87v4c732ff3d33c094e@mail.gmail.com>

Hello,

I have experience writing scripts to connect to the D-Bus interface provided
by different applications but have no experience writing a D-Bus interface
for an application. Could someone point me in the right direction? A
tutorial or a good example would be nice.

Cheers!!!
Zubin Mithra

http://zubin71.wordpress.com
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From ldo at geek-central.gen.new_zealand  Thu Mar 18 03:49:55 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Thu, 18 Mar 2010 20:49:55 +1300
Subject: import antigravity
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
Message-ID: <hnslv3$jjk$2@lust.ihug.co.nz>

In message <mailman.820.1268725930.23598.python-list at python.org>, Chris 
Rebert wrote:

I see that you published my unobfuscated e-mail address on USENET for all to
see. I obfuscated it for a reason, to keep the spammers away. I'm assuming
this was a momentary lapse of judgement, for which I expect an apology.
Otherwise, it becomes grounds for an abuse complaint to your ISP. 


From stefan_ml at behnel.de  Thu Mar 18 04:13:05 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Thu, 18 Mar 2010 09:13:05 +0100
Subject: C-API PyObject_Call
In-Reply-To: <3592cca0-2a4a-4a19-9e10-d80936e6d200@upsg2000gro.googlegroups.com>
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>	<mailman.849.1268756405.23598.python-list@python.org>	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>	<mailman.858.1268759662.23598.python-list@python.org>	<c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>	<mailman.883.1268808393.23598.python-list@python.org>
	<3592cca0-2a4a-4a19-9e10-d80936e6d200@upsg2000gro.googlegroups.com>
Message-ID: <hnsnah$1gh$1@dough.gmane.org>

moerchendiser2k3, 17.03.2010 23:35:
>> 1) put the line number information into the message string when you raise
>> the exception
>
> you mean the line and file information of the C code, right?

Funny that you (being the OP) ask *me* what kind of line information *you* 
want.

Stefan



From stefan_ml at behnel.de  Thu Mar 18 04:17:43 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Thu, 18 Mar 2010 09:17:43 +0100
Subject: import antigravity
In-Reply-To: <hnslv3$jjk$2@lust.ihug.co.nz>
References: <hnnclk$eud$1@lust.ihug.co.nz>	<mailman.820.1268725930.23598.python-list@python.org>
	<hnslv3$jjk$2@lust.ihug.co.nz>
Message-ID: <hnsnj7$2pj$1@dough.gmane.org>

Lawrence D'Oliveiro, 18.03.2010 08:49:
> In message<mailman.820.1268725930.23598.python-list at python.org>, Chris
> Rebert wrote:
>
> I see that you published my unobfuscated e-mail address on USENET for all to
> see. I obfuscated it for a reason, to keep the spammers away. I'm assuming
> this was a momentary lapse of judgement, for which I expect an apology.
> Otherwise, it becomes grounds for an abuse complaint to your ISP.

I hope you just had a bad day. Threatening others for figuring out your 
e-mail address is even worse than posting with an illegal e-mail address.

Stefan



From alfps at start.no  Thu Mar 18 04:53:05 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Thu, 18 Mar 2010 09:53:05 +0100
Subject: import antigravity
In-Reply-To: <hnslv3$jjk$2@lust.ihug.co.nz>
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
	<hnslv3$jjk$2@lust.ihug.co.nz>
Message-ID: <hnsplj$4dt$1@news.eternal-september.org>

* Lawrence D'Oliveiro:
> In message <mailman.820.1268725930.23598.python-list at python.org>, Chris 
> Rebert wrote:
> 
> I see that you published my unobfuscated e-mail address on USENET for all to
> see. I obfuscated it for a reason, to keep the spammers away. I'm assuming
> this was a momentary lapse of judgement, for which I expect an apology.
> Otherwise, it becomes grounds for an abuse complaint to your ISP. 

Hi.

Chris Rebert didn't reveal anything not already present in the posting he 
replied to, and indeed in the posting I'm replying to here.

The headers in the article I'm replying to (yours) look like this:


<headers source="your article">
Path: 
feeder.eternal-september.org!eternal-september.org!feeder.erje.net!newsfeed.straub-nv.de!news.linkpendium.com!news.linkpendium.com!newsfeeds.ihug.co.nz!lust.ihug.co.nz!ihug.co.nz!not-for-mail
From: Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand>
Newsgroups: comp.lang.python
Subject: Re: import antigravity
Followup-To: comp.lang.python
Date: Thu, 18 Mar 2010 20:49:55 +1300
Organization: Geek Central
Lines: 7
Message-ID: <hnslv3$jjk$2 at lust.ihug.co.nz>
References: <hnnclk$eud$1 at lust.ihug.co.nz> 
<mailman.820.1268725930.23598.python-list at python.org>
NNTP-Posting-Host: 118-92-14-26.dsl.dyn.ihug.co.nz
Mime-Version: 1.0
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 7Bit
X-Trace: lust.ihug.co.nz 1268898595 20084 118.92.14.26 (18 Mar 2010 07:49:55 GMT)
X-Complaints-To: abuse at ihug.co.nz
NNTP-Posting-Date: Thu, 18 Mar 2010 07:49:55 +0000 (UTC)
User-Agent: KNode/4.3.4
Xref: eternal-september.org comp.lang.python:51777
</headers>


One must assume that you were not aware that you're posting your mail address in 
plaintext in every article?


Cheers & hth.,

- Alf


From mail at timgolden.me.uk  Thu Mar 18 04:54:58 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Thu, 18 Mar 2010 08:54:58 +0000
Subject: Win32All On 64-Bit Operating Systems
In-Reply-To: <4fr777-43o2.ln1@ozzie.tundraware.com>
References: <fpc777-2iu1.ln1@ozzie.tundraware.com>	<mailman.921.1268845558.23598.python-list@python.org>	<3rl777-q1m2.ln1@ozzie.tundraware.com>	<mailman.926.1268856005.23598.python-list@python.org>
	<4fr777-43o2.ln1@ozzie.tundraware.com>
Message-ID: <4BA1EA62.1010401@timgolden.me.uk>

On 17/03/2010 20:43, Tim Daneliuk wrote:
> The intent is just to provide as similar as possible a user experience.
>> From a coding POV, it is surely simpler to just use 'winuser' and 'wingroup',
> but I am sort of philosophically wired to not throw information away if
> it's a available from the OS.

It's hardly worth disputing I suppose, but I would argue that simply
presenting the owner & group of a file in Windows is actually doing
a disservice to the user of the app. It's cluttering up the display
with information which is essentially useless. Pretty much the only
time I ever look at a file owner is when I have some knotty security
issue and I need to assess who might have WRITE_DAC permission. The
group - never; it really is a relic.

The file owner & group simply don't play the same role in Windows
security that they do in *nix. The trouble is that there isn't a
simple alternative: most files, even with default security, will
have two or three groups involved in their security at different
levels.

> BTW, wanna beta test a really cool CLI mass file renaming tool????? ;)

Sure -- I'll have a look. But I can't promise any great amount of
time at present :)

TJG



From clp2 at rebertia.com  Thu Mar 18 04:56:49 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 18 Mar 2010 01:56:49 -0700
Subject: Recall: How to add a library path to pythonpath ?
In-Reply-To: <7F0503CD69378F49BE0DC30661C6CCF684F3C839@enbmail01.lsi.com>
References: <7F0503CD69378F49BE0DC30661C6CCF684F3C839@enbmail01.lsi.com>
Message-ID: <50697b2c1003180156q61786c48i122e63caa94514bd@mail.gmail.com>

On Tue, Mar 16, 2010 at 4:56 AM, Barak, Ron <Ron.Barak at lsi.com> wrote:
> Barak, Ron would like to recall the message, "How to add a library path to pythonpath ?".

Good luck with that. :)

- Chris


From stefan_ml at behnel.de  Thu Mar 18 05:19:59 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Thu, 18 Mar 2010 10:19:59 +0100
Subject: import antigravity
In-Reply-To: <hnsplj$4dt$1@news.eternal-september.org>
References: <hnnclk$eud$1@lust.ihug.co.nz>	<mailman.820.1268725930.23598.python-list@python.org>	<hnslv3$jjk$2@lust.ihug.co.nz>
	<hnsplj$4dt$1@news.eternal-september.org>
Message-ID: <hnsr7v$f5v$1@dough.gmane.org>

Alf P. Steinbach, 18.03.2010 09:53:
> <headers source="your article">
> Path:
> feeder.eternal-september.org!eternal-september.org!feeder.erje.net!newsfeed.straub-nv.de!news.linkpendium.com!news.linkpendium.com!newsfeeds.ihug.co.nz!lust.ihug.co.nz!ihug.co.nz!not-for-mail
>
> From: Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand>
> Newsgroups: comp.lang.python
> Subject: Re: import antigravity
> Followup-To: comp.lang.python
> Date: Thu, 18 Mar 2010 20:49:55 +1300
> Organization: Geek Central
> Lines: 7
> Message-ID: <hnslv3$jjk$2 at lust.ihug.co.nz>
> References: <hnnclk$eud$1 at lust.ihug.co.nz>
> <mailman.820.1268725930.23598.python-list at python.org>
> NNTP-Posting-Host: 118-92-14-26.dsl.dyn.ihug.co.nz
> Mime-Version: 1.0
> Content-Type: text/plain; charset="ISO-8859-1"
> Content-Transfer-Encoding: 7Bit
> X-Trace: lust.ihug.co.nz 1268898595 20084 118.92.14.26 (18 Mar 2010
> 07:49:55 GMT)
> X-Complaints-To: abuse at ihug.co.nz
> NNTP-Posting-Date: Thu, 18 Mar 2010 07:49:55 +0000 (UTC)
> User-Agent: KNode/4.3.4
> Xref: eternal-september.org comp.lang.python:51777
> </headers>
>
>
> One must assume that you were not aware that you're posting your mail
> address in plaintext in every article?

Uhm - where?

Stefan



From news1234 at free.fr  Thu Mar 18 05:20:38 2010
From: news1234 at free.fr (News123)
Date: Thu, 18 Mar 2010 10:20:38 +0100
Subject: did anybody play with python and window mobile broadband?
Message-ID: <4ba1f067$0$4589$426a74cc@news.free.fr>

Hi,


I'd like to use a mobile broadband device with a windows python app.
Did anybody play already with python and the window mobile broadband
interface?

I'm looking for examples:
- how to connect/disconnect  a mobile broadband device (currently I use
rasdial. not sure it's the best solution)
- to obtain the device's current mode (GPRS / EDGE / . . . )
- to obtain the current signal level

Thanks a lot for any pointers



N



From sanjiva at croatia.oracle.in  Thu Mar 18 05:26:24 2010
From: sanjiva at croatia.oracle.in (Sanjiva P.)
Date: Thu, 18 Mar 2010 10:26:24 +0100
Subject: did anybody play with python and window mobile broadband?
References: <4ba1f067$0$4589$426a74cc@news.free.fr>
Message-ID: <hnsrih$9oi$1@speranza.aioe.org>

On 03/18/2010 10:20 AM, News123 wrote:
> I'm looking for examples:
> - how to connect/disconnect  a mobile broadband device (currently I use
> rasdial. not sure it's the best solution)
> - to obtain the device's current mode (GPRS / EDGE / . . . )
> - to obtain the current signal level
> 
> Thanks a lot for any pointers

Well no examples,but most or all of it should work through AT commands.

Did you try plugging the mobile broadband interface in?


From alfps at start.no  Thu Mar 18 05:29:04 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Thu, 18 Mar 2010 10:29:04 +0100
Subject: import antigravity
In-Reply-To: <mailman.949.1268904013.23598.python-list@python.org>
References: <hnnclk$eud$1@lust.ihug.co.nz>	<mailman.820.1268725930.23598.python-list@python.org>	<hnslv3$jjk$2@lust.ihug.co.nz>	<hnsplj$4dt$1@news.eternal-september.org>
	<mailman.949.1268904013.23598.python-list@python.org>
Message-ID: <hnsrp1$dpp$1@news.eternal-september.org>

* Stefan Behnel:
> Alf P. Steinbach, 18.03.2010 09:53:
>> <headers source="your article">
>> Path:
>> feeder.eternal-september.org!eternal-september.org!feeder.erje.net!newsfeed.straub-nv.de!news.linkpendium.com!news.linkpendium.com!newsfeeds.ihug.co.nz!lust.ihug.co.nz!ihug.co.nz!not-for-mail 
>>
>>
>> From: Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand>
>> Newsgroups: comp.lang.python
>> Subject: Re: import antigravity
>> Followup-To: comp.lang.python
>> Date: Thu, 18 Mar 2010 20:49:55 +1300
>> Organization: Geek Central
>> Lines: 7
>> Message-ID: <hnslv3$jjk$2 at lust.ihug.co.nz>
>> References: <hnnclk$eud$1 at lust.ihug.co.nz>
>> <mailman.820.1268725930.23598.python-list at python.org>
>> NNTP-Posting-Host: 118-92-14-26.dsl.dyn.ihug.co.nz
>> Mime-Version: 1.0
>> Content-Type: text/plain; charset="ISO-8859-1"
>> Content-Transfer-Encoding: 7Bit
>> X-Trace: lust.ihug.co.nz 1268898595 20084 118.92.14.26 (18 Mar 2010
>> 07:49:55 GMT)
>> X-Complaints-To: abuse at ihug.co.nz
>> NNTP-Posting-Date: Thu, 18 Mar 2010 07:49:55 +0000 (UTC)
>> User-Agent: KNode/4.3.4
>> Xref: eternal-september.org comp.lang.python:51777
>> </headers>
>>
>>
>> One must assume that you were not aware that you're posting your mail
>> address in plaintext in every article?
> 
> Uhm - where?

Well, at least the one that Chris Rebert quoted, 
<mailto:ldo at geek-central.gen.new_zealand> (in the 'From:' header).

The point is, if he's upset about Chris quoting that, then he's probably unaware 
that he's posting it in plaintext himself.


Cheers,

- Alf


From jpiitula at ling.helsinki.fi  Thu Mar 18 05:42:30 2010
From: jpiitula at ling.helsinki.fi (Jussi Piitulainen)
Date: 18 Mar 2010 11:42:30 +0200
Subject: import antigravity
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
	<hnslv3$jjk$2@lust.ihug.co.nz>
	<hnsplj$4dt$1@news.eternal-september.org>
	<mailman.949.1268904013.23598.python-list@python.org>
	<hnsrp1$dpp$1@news.eternal-september.org>
Message-ID: <qotwrxa3r09.fsf@ruuvi.it.helsinki.fi>

Alf P. Steinbach writes:

> The point is, if he's upset about Chris quoting that, then he's
> probably unaware that he's posting it in plaintext himself.

The complaint was not about quoting but about using in public. Chris
sent his piece to three addresses. From his headers, redacted:

   Newsgroups: comp.lang.python
   To: "Lawrence D'Oliveiro" <ldo at geek-central.gen.[REDACTED]>
   Cc: python-list at python.org

Can we stop importing red herrings now?


From 2ennel.0569 at gmail.com  Thu Mar 18 05:54:16 2010
From: 2ennel.0569 at gmail.com (LALITHA N)
Date: Thu, 18 Mar 2010 02:54:16 -0700 (PDT)
Subject: ARE YOU ARE FAMILIAR WITH ANY COMPUTER LANGUAGE-GET GOOD LUCK
Message-ID: <08d44b50-e96a-464f-9645-ce35b17eb1ab@t9g2000prh.googlegroups.com>

http://123maza.com/75/expressions


From alfps at start.no  Thu Mar 18 06:04:21 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Thu, 18 Mar 2010 11:04:21 +0100
Subject: import antigravity
In-Reply-To: <qotwrxa3r09.fsf@ruuvi.it.helsinki.fi>
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
	<hnslv3$jjk$2@lust.ihug.co.nz>
	<hnsplj$4dt$1@news.eternal-september.org>
	<mailman.949.1268904013.23598.python-list@python.org>
	<hnsrp1$dpp$1@news.eternal-september.org>
	<qotwrxa3r09.fsf@ruuvi.it.helsinki.fi>
Message-ID: <hnstr6$qu3$1@news.eternal-september.org>

* Jussi Piitulainen:
> Alf P. Steinbach writes:
> 
>> The point is, if he's upset about Chris quoting that, then he's
>> probably unaware that he's posting it in plaintext himself.
> 
> The complaint was not about quoting but about using in public. Chris
> sent his piece to three addresses. From his headers, redacted:
> 
>    Newsgroups: comp.lang.python
>    To: "Lawrence D'Oliveiro" <ldo at geek-central.gen.[REDACTED]>
>    Cc: python-list at python.org
> 
> Can we stop importing red herrings now?

Oh, I didn't see that  --  it's Bad Practice so I didn't look for it.


Cheers,

- Alf


From eglyph at gmail.com  Thu Mar 18 06:07:22 2010
From: eglyph at gmail.com (eglyph at gmail.com)
Date: Thu, 18 Mar 2010 03:07:22 -0700 (PDT)
Subject: did anybody play with python and window mobile broadband?
References: <4ba1f067$0$4589$426a74cc@news.free.fr>
Message-ID: <9fa65dc9-e9fc-4a35-a796-2e56980b63ac@t23g2000yqt.googlegroups.com>

On 18 ???, 11:20, News123 <news1... at free.fr> wrote:
> I'd like to use a mobile broadband device with a windows python app.
> Did anybody play already with python and the window mobile broadband
> interface?
>

There was a discussion on this subject in some local forum recently. I
assume you're using PythonCE, right?

The best solution proposed there was to use ctypes and WinAPI. You can
find a relatively high level APIs to set up a connection (without need
to go too low level with AT commands) and make your own wrapper.

A good starting point can be found here: http://msdn.microsoft.com/en-us/library/bb416346.aspx
(it's not the only way to to things, btw).

--
regards,
eGlyph


From eglyph at gmail.com  Thu Mar 18 06:19:55 2010
From: eglyph at gmail.com (eglyph at gmail.com)
Date: Thu, 18 Mar 2010 03:19:55 -0700 (PDT)
Subject: url2lib (windows 7) does not notice when network reconnects 
	(getaddrinfo problem)
References: <4ba15c0d$0$15456$426a74cc@news.free.fr>
Message-ID: <46a27485-cbe9-48e1-9055-f7d4d0d20785@u9g2000yqb.googlegroups.com>

On 18 ???, 00:47, News123 <news1... at free.fr> wrote:
> Hi,
>
> I'd like to write a function, that knows when the 'internet' is reachable.
>
> My setup is a windows7 host with a wireless USB modem. The modem might
> connect / disconnect any time.
>
> I thought I write a small function just checking whether I can fetch a url.
> ######### script starts
> import time,urllib2
>
> myurl = "http://www.mysite.com" # or "www.google.com" or whatever you like
>
> while True:
> ? ? connected = False
> ? ? try:
> ? ? ? ? urllib2.urlopen(myurl)
> ? ? ? ? connected = True
> ? ? except urllib2.URLError as e:
> ? ? ? ? print "urlerr %s" % e
> ? ? print "connected",connected
> ? ? time.sleep(1)
> ########## end of script
>
> if the network is connected when I start the script the first time after
> reboot, then ?I receive> connected True
>
> As expected
>
> If the network is disconnected when I start the script the first time
> after reboot, then ?I receive> urlerr <urlopen error [Errno 11004] getaddrinfo failed>
> > connected False
>
> as expected
>
> Things are getting weired, when my USB wireless modem connects after
> I started my script:
>
> It happens, that I just continue to receive:
>
> > urlerr <urlopen error [Errno 11004] getaddrinfo failed>
> > connected False
>
> however when I use a windows cmd window and I start
> "pingwww.mysite.com", then my python script recovers and reports
>
> > connected True
>
> My perhaps false conclusion is, that getaddrinfo() is not retrying to
> resolve an IP address, when it failed once.
>
> Is this behaviour known? Can this really be possible?
> I can reproduce this issue. not every time, but rather often.
>
> If yes, is there any way to force a new host name lookup under windows?
>
> What else could I be doing wrong?
>
> Thanks a lot in advance for any ideas
>
> N

Actually this should be expected behavior. Windows establishes
connection automatically when you start pinging something, your script
doesn't. Just check the connection state with winapi (ctypes?
pywin32?) and establish it if it isn't already.

--
regards, eGlyph


From sparks.m at gmail.com  Thu Mar 18 06:21:08 2010
From: sparks.m at gmail.com (Michael Sparks)
Date: Thu, 18 Mar 2010 03:21:08 -0700 (PDT)
Subject: Nested Scopes unintended behaviour ?
References: <7a110632-d6c5-446b-a34b-95548fadb2f9@r27g2000yqn.googlegroups.com>
	<hnqtbp$bbb$1@dough.gmane.org>
	<mailman.929.1268857761.23598.python-list@python.org>
Message-ID: <921f09da-bf41-4306-aca5-19baa70dd2b2@e7g2000yqf.googlegroups.com>

On Mar 17, 8:29?pm, Terry Reedy <tjre... at udel.edu> wrote:
> On 3/17/2010 11:44 AM, Emile van Sebille wrote:
>
> > On 3/17/2010 8:16 AM Michael Sparks said...
> >> Hi,
>
> >> Is the following behaviour expected ?
>
> > In short, yes. Assignment within a function forces the variable to
> > locals.
>
> In 3.x, one can declare names to be nonlocal (ie, local to some outer
> function, as opposed to local to the current function or module global).
> In your case,
> ? ?nonlocal on
> in your inner swtchfun function would give the behavior you wanted.

Ah, excellent. That makes python closures work more like I'd expect
them to. (A colleague had written the swtchfun I posted, whereas the
generator form was the version I wrote, and he was puzzled as to why
it didn't work as he expected. When I saw it I also couldn't see why.

After hearing it's expected behaviour in 2.6 it's clear that assigning
a name to a value declares the variable to be local, and that unlike
much of python (but like yield) this appears based on static analysis
of the function declaration, rather than dynamic. This does also make
sense since it prevents a name "switching scope" in a function, and a
"nonlocal" keyword also makes sense as a result.

Thanks to Emile for pointing out you can also do this in 2.6:
def Toggler(F, B):
    print F("Hello")
    print F("Hello")
    print F("Hello")
    print F("Hello")
    print F("Hello")

def Switcher(A,B):
    enclose={"on" : True}
    def swtchfun(msg, enclose=enclose):
        if enclose["on"]:
            enclose["on"] = False
            print "Switched to A"
            return A
        else:
            enclose["on"] = True
            print "Switched to B"
            return B
    #
    return Toggler(swtchfun,True)

Switcher(1,2)


I think personally I'd use the generator form myself, since I think
it's clearer (more clearly loops between the two), but this may be a
useful thing to know occasionally.

Cheers :-)


Michael.


From python.list at tim.thechases.com  Thu Mar 18 06:25:19 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Thu, 18 Mar 2010 05:25:19 -0500
Subject: os.walk restart
In-Reply-To: <68cbed3c-87f6-45c9-ac8e-a536cae20f26@k6g2000prg.googlegroups.com>
References: <a8c1c0df-cbfa-421c-a869-9f4c555a80ac@l11g2000pro.googlegroups.com>
	<68cbed3c-87f6-45c9-ac8e-a536cae20f26@k6g2000prg.googlegroups.com>
Message-ID: <4BA1FF8F.8080402@tim.thechases.com>

Steve Howell wrote:
> If that's the case, then you might be able to get away with just
> leaving some kind of breadcrumbs whenever you've successfully
> processed a directory or a file,

Unless you're indexing a read-only device (whether hardware 
read-only like a CD, or permission-wise read-only like a network 
share or a non-priv user walking system directories)...

> Also, I can understand why the operations on the files themselves
> might crash, but can't you catch an exception and keep on chugging?

I also wondered this one, perhaps logging the directory in which 
the exception happened to later revisit. :)

-tkc




From steve at holdenweb.com  Thu Mar 18 07:31:46 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 18 Mar 2010 07:31:46 -0400
Subject: import antigravity
In-Reply-To: <qotwrxa3r09.fsf@ruuvi.it.helsinki.fi>
References: <hnnclk$eud$1@lust.ihug.co.nz>	<mailman.820.1268725930.23598.python-list@python.org>	<hnslv3$jjk$2@lust.ihug.co.nz>	<hnsplj$4dt$1@news.eternal-september.org>	<mailman.949.1268904013.23598.python-list@python.org>	<hnsrp1$dpp$1@news.eternal-september.org>
	<qotwrxa3r09.fsf@ruuvi.it.helsinki.fi>
Message-ID: <hnt2vk$cba$1@dough.gmane.org>

Jussi Piitulainen wrote:
> Alf P. Steinbach writes:
> 
>> The point is, if he's upset about Chris quoting that, then he's
>> probably unaware that he's posting it in plaintext himself.
> 
> The complaint was not about quoting but about using in public. Chris
> sent his piece to three addresses. From his headers, redacted:
> 
>    Newsgroups: comp.lang.python
>    To: "Lawrence D'Oliveiro" <ldo at geek-central.gen.[REDACTED]>
>    Cc: python-list at python.org
> 
> Can we stop importing red herrings now?

Surely the point of such an obvious obfuscation is that humans can
de-obfuscate is easily. The fact that it was then used in an open
newsgroup communication is just part of the shit that happens every day.

Complaining to Chris's ISP is unlikely to be anything other than a waste
of time. Drawing attention to it the way Lawrence did is much more
likely to draw attention to it that simply gracefully letting it pass.

Lawrence, if you are so worried perhaps you should consider not using
e-mail any more. It's clearly too dangerous to suit you.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at REMOVE-THIS-cybersource.com.au  Thu Mar 18 07:52:08 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 18 Mar 2010 11:52:08 GMT
Subject: import antigravity
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
	<hnslv3$jjk$2@lust.ihug.co.nz>
	<mailman.944.1268900406.23598.python-list@python.org>
Message-ID: <4ba213e8$0$27806$c3e8da3@news.astraweb.com>

On Thu, 18 Mar 2010 09:17:43 +0100, Stefan Behnel wrote:

> Lawrence D'Oliveiro, 18.03.2010 08:49:
>> In message<mailman.820.1268725930.23598.python-list at python.org>, Chris
>> Rebert wrote:
>>
>> I see that you published my unobfuscated e-mail address on USENET for
>> all to see. I obfuscated it for a reason, to keep the spammers away.
>> I'm assuming this was a momentary lapse of judgement, for which I
>> expect an apology. Otherwise, it becomes grounds for an abuse complaint
>> to your ISP.
> 
> I hope you just had a bad day. Threatening others for figuring out your
> e-mail address is even worse than posting with an illegal e-mail
> address.

No, this is hardly the first time that Lawrence has made such a 
wankerific threat:

http://www.mail-archive.com/python-list%40python.org/msg245012.html


I sympathise, because many years ago I lost an email address, made 
unusable by spam, after using it unobfuscated in Usenet. But I think that 
the spammers have mostly moved on these days. The pickings are much 
richer for hijacking people's address books in Hotmail, Facebook or 
Outlook, and the state of the art of anti-spam is better too. So I think 
that Lawrence needs to HTFU and stop making empty threats over something 
so trivial.


-- 
Steven


From robin at reportlab.com  Thu Mar 18 08:06:16 2010
From: robin at reportlab.com (Robin Becker)
Date: Thu, 18 Mar 2010 12:06:16 +0000
Subject: bug in bdist_wininst cross compile?
In-Reply-To: <op.u9qecmi2x6zn5v@lepton.softlabbsas.com.ar>
References: <4BA0E958.8050205@chamonix.reportlab.co.uk>
	<op.u9qecmi2x6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <4BA21738.9070307@chamonix.reportlab.co.uk>

On 17/03/2010 21:37, Gabriel Genellina wrote:
> En Wed, 17 Mar 2010 11:38:16 -0300, Robin Becker <robin at reportlab.com>
> escribi?:
>
>> has anyone had any success with cross compilation and bdist_wininst; I
>> have modified build_ext very slightly to fix a small bug in cross
>> compilation related to library order.
>
> Please post your bug report + patch at http://bugs.python.org or it will
> be lost.
>

OK done
-- 
Robin Becker



From królewna at ee.pl  Thu Mar 18 08:58:32 2010
From: królewna at ee.pl (=?UTF-8?B?a3LDs2xld25h?=)
Date: Thu, 18 Mar 2010 13:58:32 +0100
Subject: sqlite3, memory db and multithreading
Message-ID: <hnt81m$fsi$1@news.task.gda.pl>

The problem is simple: I have multiple threads within one program. At 
least 2 threads have to have access to in-memory sqlite database. It is 
not possible to pass sqlite objects to those threads because an 
exception is rised:

ProgrammingError: SQLite objects created in a thread can only be used in 
that same thread.The object was created in thread id -1219066176 and 
this is thread id -1224475792

Is there any EASY way to use this in-memory db in many threads? Creating 
another connection is not a solution as it creates completely new db 
instead of connecting to the existing one.

--
Best regards
princess


From christian at dowski.com  Thu Mar 18 09:40:59 2010
From: christian at dowski.com (Christian)
Date: Thu, 18 Mar 2010 06:40:59 -0700 (PDT)
Subject: Feeding differeent data types to a class instance?
References: <ac9a5500-6b06-4fee-b483-bab76922b44e@d2g2000yqa.googlegroups.com>
	<mailman.728.1268571895.23598.python-list@python.org>
	<3189fde6-bd5e-4ee2-8a8e-41c55cf9f926@q23g2000yqd.googlegroups.com>
Message-ID: <72c18de4-0161-435f-a083-01d69151323a@x1g2000prb.googlegroups.com>

On Mar 14, 2:16?pm, kuru <maymunbe... at gmail.com> wrote:
> Hi
>
> Thank you so much for all these great suggestions. I will have time
> today to try all these and see which one works best for me

Answers to your question have spread onto the Python blogosphere as
well.

http://pythonconquerstheuniverse.wordpress.com/2010/03/17/multiple-constructors-in-a-python-class/

http://blog.dowski.com/2010/03/17/my-take-on-multiple-constructors/

That second one is my response.

Christian




From tundra at tundraware.com  Thu Mar 18 09:43:14 2010
From: tundra at tundraware.com (Tim Daneliuk)
Date: Thu, 18 Mar 2010 08:43:14 -0500
Subject: Win32All On 64-Bit Operating Systems
In-Reply-To: <mailman.947.1268902506.23598.python-list@python.org>
References: <fpc777-2iu1.ln1@ozzie.tundraware.com>	<mailman.921.1268845558.23598.python-list@python.org>	<3rl777-q1m2.ln1@ozzie.tundraware.com>	<mailman.926.1268856005.23598.python-list@python.org>	<4fr777-43o2.ln1@ozzie.tundraware.com>
	<mailman.947.1268902506.23598.python-list@python.org>
Message-ID: <f7n977-10t2.ln1@ozzie.tundraware.com>

On 3/18/2010 3:54 AM, Tim Golden wrote:
> On 17/03/2010 20:43, Tim Daneliuk wrote:
>> The intent is just to provide as similar as possible a user experience.
>>> From a coding POV, it is surely simpler to just use 'winuser' and
>>> 'wingroup',
>> but I am sort of philosophically wired to not throw information away if
>> it's a available from the OS.
> 
> It's hardly worth disputing I suppose, but I would argue that simply
> presenting the owner & group of a file in Windows is actually doing
> a disservice to the user of the app. It's cluttering up the display
> with information which is essentially useless. Pretty much the only
> time I ever look at a file owner is when I have some knotty security
> issue and I need to assess who might have WRITE_DAC permission. The
> group - never; it really is a relic.
> 
> The file owner & group simply don't play the same role in Windows
> security that they do in *nix. The trouble is that there isn't a
> simple alternative: most files, even with default security, will
> have two or three groups involved in their security at different
> levels.
> 
>> BTW, wanna beta test a really cool CLI mass file renaming tool????? ;)
> 
> Sure -- I'll have a look. But I can't promise any great amount of
> time at present :)
> 
> TJG
> 

I will announce the Beta for 'tren' here and you (and anyone else) can have at it.


-- 
----------------------------------------------------------------------------
Tim Daneliuk     tundra at tundraware.com
PGP Key:         http://www.tundraware.com/PGP/



From chris at simplistix.co.uk  Thu Mar 18 09:44:53 2010
From: chris at simplistix.co.uk (Chris Withers)
Date: Thu, 18 Mar 2010 13:44:53 +0000
Subject: converting a timezone-less datetime to seconds since the epoch
In-Reply-To: <50697b2c1003160713x7641d2cfn52a5e5ca199e26de@mail.gmail.com>
References: <4B9F8BE0.2050808@simplistix.co.uk>
	<50697b2c1003160713x7641d2cfn52a5e5ca199e26de@mail.gmail.com>
Message-ID: <4BA22E55.9040006@simplistix.co.uk>

Hey Chris,

Chris Rebert wrote:
>> def timestamp(dttm):
>>    return time.mktime(dttm.timetuple())
> 
> from calendar import timegm
> 
> def timestamp(dttm):
>     return timegm(dttm.utctimetuple())
> #the *utc*timetuple change is just for extra consistency
> #it shouldn't actually make a difference here

Ah, right. What on earth is timegm doing in calendar?
No way I ever would have thought to look there...

I wonder what the best way to get this stuff documented in the datetime 
modules docs is?

Chris

-- 
Simplistix - Content Management, Batch Processing & Python Consulting
             - http://www.simplistix.co.uk


From googler.1.webmaster at spamgourmet.com  Thu Mar 18 09:58:00 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Thu, 18 Mar 2010 06:58:00 -0700 (PDT)
Subject: C-API PyObject_Call
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
	<mailman.849.1268756405.23598.python-list@python.org>
	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>
	<mailman.858.1268759662.23598.python-list@python.org>
	<c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>
	<mailman.883.1268808393.23598.python-list@python.org>
	<3592cca0-2a4a-4a19-9e10-d80936e6d200@upsg2000gro.googlegroups.com>
	<mailman.943.1268899999.23598.python-list@python.org>
Message-ID: <793e5934-bc1b-4023-aa0e-bf6d956177fd@f8g2000yqn.googlegroups.com>

> Funny that you (being the OP) ask *me* what kind of line information *you*
> want.
>
> Stefan

Well, I need the line/file information of Python :


From 1 at depikt.net  Thu Mar 18 10:24:52 2010
From: 1 at depikt.net (DreiJane)
Date: Thu, 18 Mar 2010 07:24:52 -0700 (PDT)
Subject: Python, Reportlabs, Pil and Windows 7 (64bit)
References: <a54ed090-954b-4ba4-98ff-fd052512c4ba@e7g2000yqf.googlegroups.com>
	<mailman.619.1268324988.23598.python-list@python.org>
	<4B992FB5.8090207@v.loewis.de> 
	<4B9A2810.9030602@chamonix.reportlab.co.uk>
	<4B9A614C.1080105@chamonix.reportlab.co.uk> 
	<4B9A9624.7040200@v.loewis.de>
	<mailman.783.1268647151.23598.python-list@python.org> 
	<8aa22e57-f152-4dc7-88da-cf6879de41f7@q16g2000yqq.googlegroups.com>
Message-ID: <c602af5c-842e-460b-814f-d8e922019a2d@q23g2000yqd.googlegroups.com>

Hello,

i've used reportlabs over two years now and was content with its
quality. These days i have turned to cairo and can only recommend to
do so: It is still easier to use (than the well-designed reportlabs
tools) and an engine working in a lot of other software too, for
example firefox.

Reasons for this: reportlabs do not even answer question about the
date to upgrade to Python3. Since Platypus isn't complete, i had to do
a lot with the primitves in the canvas object after all - that part of
my code got even shorter with cairo. For me - working with pygtk -
that spares two installations also.

To repear myself: I love cairo.

Regards, Joost



From alt.mcarter at googlemail.com  Thu Mar 18 10:45:54 2010
From: alt.mcarter at googlemail.com (Mark Carter)
Date: Thu, 18 Mar 2010 07:45:54 -0700 (PDT)
Subject: Install 2.6.4 as non-admin on Windows
Message-ID: <60c2ac2f-0472-4790-a879-533845bcedb5@q16g2000yqq.googlegroups.com>

How do I install python 2.6.4 on Windows without admin privileges?

Can I install it on a machine I control, zip up the contents, copy it
across to an admin-restricted machine, and set up a couple of
environemtn variables? Does python install files to system
directories, making this impossible?


From 1 at depikt.net  Thu Mar 18 10:49:29 2010
From: 1 at depikt.net (DreiJane)
Date: Thu, 18 Mar 2010 07:49:29 -0700 (PDT)
Subject: sqlite3, memory db and multithreading
References: <hnt81m$fsi$1@news.task.gda.pl>
Message-ID: <57dc1ce8-1ac7-4d72-aafc-6fe7920144c2@c16g2000yqd.googlegroups.com>

Hello,

i cannot help you directly with sqlite2 in the Standardlib, since i am
used to work with Roger Binns's apsw. After a short experiment with
pysqlite leading to data loss - caused by one of the unclearer
exception messages of sqlite3 and me having a bad day - i at once
turned back to apsw. And so far i haven't done much with threads.

Principally sqlite connections (sqlite3 objects in the C-API) can be
used over multiple threads - and connections to :memory: make no
difference. There are additional parameters to open() giving fine-
tuned control. And apsw is promising a true reflection of sqlite's C-
API.

Regards, Joost


From eglyph at gmail.com  Thu Mar 18 11:23:44 2010
From: eglyph at gmail.com (eglyph at gmail.com)
Date: Thu, 18 Mar 2010 08:23:44 -0700 (PDT)
Subject: Install 2.6.4 as non-admin on Windows
References: <60c2ac2f-0472-4790-a879-533845bcedb5@q16g2000yqq.googlegroups.com>
Message-ID: <3ab6c32c-3516-407c-8f89-da666fed86a5@z11g2000yqz.googlegroups.com>

On 18 ???, 16:45, Mark Carter <alt.mcar... at googlemail.com> wrote:
> How do I install python 2.6.4 on Windows without admin privileges?
>
> Can I install it on a machine I control, zip up the contents, copy it
> across to an admin-restricted machine, and set up a couple of
> environemtn variables? Does python install files to system
> directories, making this impossible?

The only file written to a system folder is python2x.dll (I think it's
not true for python2.6 any longer), so your approach is perfectly
valid if you can put this dll into a folder where it can be found by
the system.

PortablePython does this almost the same.

--
regards, eGlyph


From alt.mcarter at googlemail.com  Thu Mar 18 11:36:11 2010
From: alt.mcarter at googlemail.com (Mark Carter)
Date: Thu, 18 Mar 2010 08:36:11 -0700 (PDT)
Subject: Install 2.6.4 as non-admin on Windows
References: <60c2ac2f-0472-4790-a879-533845bcedb5@q16g2000yqq.googlegroups.com>
	<3ab6c32c-3516-407c-8f89-da666fed86a5@z11g2000yqz.googlegroups.com>
Message-ID: <99e3568c-0d48-46da-8483-6726b9cc9f58@l25g2000yqd.googlegroups.com>

On 18 Mar, 15:23, "egl... at gmail.com" <egl... at gmail.com> wrote:
> The only file written to a system folder is python2x.dll (I think it's
> not true for python2.6 any longer), so your approach is perfectly
> valid if you can put this dll into a folder where it can be found by
> the system.

Thanks. That sounds easy enough to do. I guess it's the same deal with
win32all.


From filip.popravi.stojmenovic at fer.hr  Thu Mar 18 12:17:11 2010
From: filip.popravi.stojmenovic at fer.hr (drstoka)
Date: Thu, 18 Mar 2010 17:17:11 +0100
Subject: Need to create subprocess...
Message-ID: <hntjrc$m6k$1@sunce.iskon.hr>

Hello,

I have to run a program as a child process inside my python program and 
redirect it's output through a pipe to a parent program process.
So, I wrote this:

pipe = Popen('example_program', shell=True, bufsize=0, stdout=PIPE).stdout

and it works great.

Now, in parent program I need to wait for a some time and if a child 
(example_program) does not finish in that time, kill the child.

How do I do that? Please help. 




From sccolbert at gmail.com  Thu Mar 18 12:28:53 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Thu, 18 Mar 2010 12:28:53 -0400
Subject: C++ code generation
In-Reply-To: <24b7e9.8952.1276b803126.Coremail.dr.cg@126.com>
References: <24b7e9.8952.1276b803126.Coremail.dr.cg@126.com>
Message-ID: <7f014ea61003180928q4763a819ic548364e2811952d@mail.gmail.com>

I think Stefan was telling you, in a nice way, to stop spamming every thread
about code generation with a plug for your project.

2010/3/17 CHEN Guang <dr.cg at 126.com>

> >> ----- Original Message -----
> >> From: "Dan Goodman"<dg.gmane at thesamovar.net>
> >>
> >>> I'm doing some C++ code generation using Python, and would be
> interested
> >>> in any comments on the approach I'm taking.
> >>
> >> PythoidC ( http://pythoidc.googlecode.com ) is a C code generator (not
> C++)
> >
> > It would be nice if you could start reading the posts before you answer,
> > and then try to give an answer that fits the question.
> >
> > Stefan
>
> I have read the post, may be I lost some words and made you misunderstand.
> I meant:
> PythoidC ( http://pythoidc.googlecode.com ) is a C code generator (but not
> C++), if you find it useful,
> welcome to take a look.
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
-------------- next part --------------
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From tim.arnold at sas.com  Thu Mar 18 12:38:34 2010
From: tim.arnold at sas.com (Tim Arnold)
Date: Thu, 18 Mar 2010 12:38:34 -0400
Subject: multiprocessing on freebsd
References: <f1121800-f416-4455-b223-dfa562edb853@t23g2000yqt.googlegroups.com>
	<hnrabj$c4v$1@news.eternal-september.org>
Message-ID: <hntkua$39k$1@foggy.unx.sas.com>

"Martin P. Hellwig" <martin.hellwig at dcuktec.org> wrote in message 
news:hnrabj$c4v$1 at news.eternal-september.org...
> On 03/17/10 13:30, Tim Arnold wrote:
>> Hi,
>> I'm checking to see if multiprocessing works on freebsd for any
>> version of python. My server is about to get upgraded from 6.3 to 8.0
>> and I'd sure like to be able to use multiprocessing.
>>
>> I think the minimal test would be:
>> ---------------------
>> import multiprocessing
>> q = multiprocessing.Queue()
>> ---------------------
>>
>> with 6.3, I get
>>
>>   File "/usr/local/lib/python2.6/multiprocessing/__init__.py", line
>> 212, in Queue
>>      from multiprocessing.queues import Queue
>>    File "/usr/local/lib/python2.6/multiprocessing/queues.py", line 22,
>> in<module>
>>      from multiprocessing.synchronize import Lock, BoundedSemaphore,
>> Semaphore, Condition
>>    File "/usr/local/lib/python2.6/multiprocessing/synchronize.py", line
>> 33, in<module>
>>      " function, see issue 3770.")
>> ImportError: This platform lacks a functioning sem_open
>> implementation, therefore, the required synchronization primitives
>> needed will not function, see issue 3770.
>>
>
> Build mine from ports, with the following options (notice SEM & PTH):
> [martin at aspire8930 /usr/home/martin]$ cat /var/db/ports/python26/options
> # This file is auto-generated by 'make config'.
> # No user-servicable parts inside!
> # Options for python26-2.6.4
> _OPTIONS_READ=python26-2.6.4
> WITH_THREADS=true
> WITHOUT_HUGE_STACK_SIZE=true
> WITH_SEM=true
> WITH_PTH=true
> WITH_UCS4=true
> WITH_PYMALLOC=true
> WITH_IPV6=true
> WITHOUT_FPECTL=true
>
> [martin at aspire8930 /usr/home/martin]$ uname -a
> FreeBSD aspire8930 8.0-STABLE FreeBSD 8.0-STABLE #3: Wed Feb  3 17:01:18 
> GMT 2010     martin at aspire8930:/usr/obj/usr/src/sys/ASPIRE8930  amd64
> [martin at aspire8930 /usr/home/martin]$ python
> Python 2.6.4 (r264:75706, Mar 17 2010, 18:44:24)
> [GCC 4.2.1 20070719  [FreeBSD]] on freebsd8
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import multiprocessing as mp
> >>> queue = mp.Queue()
> >>>
>
> hth
> -- 
> mph

Hi Martin, thanks very much for posting that. All I can say is YAY! I'm 
really looking forward to my machine's upgrade now!

thanks,
--Tim




From stefan_ml at behnel.de  Thu Mar 18 12:43:28 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Thu, 18 Mar 2010 17:43:28 +0100
Subject: C-API PyObject_Call
In-Reply-To: <793e5934-bc1b-4023-aa0e-bf6d956177fd@f8g2000yqn.googlegroups.com>
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>	<mailman.849.1268756405.23598.python-list@python.org>	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>	<mailman.858.1268759662.23598.python-list@python.org>	<c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>	<mailman.883.1268808393.23598.python-list@python.org>	<3592cca0-2a4a-4a19-9e10-d80936e6d200@upsg2000gro.googlegroups.com>	<mailman.943.1268899999.23598.python-list@python.org>
	<793e5934-bc1b-4023-aa0e-bf6d956177fd@f8g2000yqn.googlegroups.com>
Message-ID: <hntl7f$po0$1@dough.gmane.org>

moerchendiser2k3, 18.03.2010 14:58:
>> Funny that you (being the OP) ask *me* what kind of line information *you*
>> want.
>>
>> Stefan
>
> Well, I need the line/file information of Python :

Then please explain what kind of Python line number you expect to find in C 
code.

Hint: providing details often results in getting helpful answers.

Stefan



From jjposner at optimum.net  Thu Mar 18 12:48:35 2010
From: jjposner at optimum.net (John Posner)
Date: Thu, 18 Mar 2010 12:48:35 -0400
Subject: Method / Functions - What are the differences?
In-Reply-To: <mailman.590.1268272205.23598.python-list@python.org>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>	<4b8c2a34$0$10470$426a74cc@news.free.fr>	<mailman.81.1267492052.23598.python-list@python.org>	<4b8cd310$0$4604$426a34cc@news.free.fr>	<mailman.109.1267539415.23598.python-list@python.org>	<hmk1mn$70u$1@newsreader3.netcologne.de>	<4b8e4041$0$17447$426a34cc@news.free.fr>
	<hmlte9$d0f$1@dough.gmane.org>	<mailman.205.1267633968.23598.python-list@python.org>	<4b8e9660$0$21812$426a34cc@news.free.fr>	<hmmrh4$644$1@newsreader3.netcologne.de>
	<4B8EF717.3070701@optimum.net>	<4b902338$0$31260$607ed4bc@cv.net>	<4b90f5eb$0$9148$426a74cc@news.free.fr>	<4b911ee0$0$4988$607ed4bc@cv.net>
	<4B97B092.4060901@optimum.net>
	<mailman.590.1268272205.23598.python-list@python.org>
Message-ID: <4BA25963.1060802@optimum.net>

On 3/10/2010 8:37 PM, Gabriel Genellina wrote:
> En Wed, 10 Mar 2010 11:45:38 -0300, John Posner <jjposner at optimum.net>
> escribi?:
>
>> As I promised/threatened, here's the *start* of a write-up on
>> properties, aimed at non-advanced Python programmers:
>>
>> http://www.jjposner.net/media/python-properties-0310.pdf
>
> I'd use 'function' instead of 'procedure', as this last word is very
> uncommon in Python literature (also, "the procedure's return value..." may
> look very strange to some people).

I was trying to avoid the function-vs-method swamp, and so I used 
"procedure". I agree that it was an unfortunate strategy. In a rewrite, 
I'm using "function" for the most part

>
> I'm unsure if one should make a distinction 'storage attribute' vs.
> 'method attribute', or even if it makes things actually more clear.

Agreed -- I was trying too hard to be helpful, and introduced 
unnecessary terminology.

> ... I
> think you could present the motivating idea first ("I want to execute some
> code when accessing an attribute") and only later talk about properties

That was my intention. I hope it comes across more clearly in the rewrite.

> and descriptors (as written, the reader still doesn't know how to define a
> simple property and you've already talked about deleting attributes...)

That doesn't bother me. It's OK to describe capabilities -- but not give 
how-to's -- in an overview section.



And Edward Cherlin wrote:

> I find that it will explain things to those who already understand
> most of the concepts. However, I felt as though I were being led
> through a maze without knowing where we were headed.

   ...

> Who is your expected audience?

I was headed toward having the reader *really* understand the @property 
decorator. And I was intending that reader to be a non-advanced Python 
user -- say, at the CS 101 level. I'm now convinced that such a goal was 
"a bridge too far". It has a lot moving parts, including a prerequisite 
that is a major topic in itself -- the descriptor protocol. That puts 
the goal way beyond reach.




There's another draft at:

   http://www.jjposner.net/media/python-properties-0318.pdf


Many thanks for your comments,
John


From martin.hellwig at dcuktec.org  Thu Mar 18 13:25:33 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Thu, 18 Mar 2010 17:25:33 +0000
Subject: Need to create subprocess...
In-Reply-To: <hntjrc$m6k$1@sunce.iskon.hr>
References: <hntjrc$m6k$1@sunce.iskon.hr>
Message-ID: <hntnm9$9hf$1@news.eternal-september.org>

On 03/18/10 16:17, drstoka wrote:
> Hello,
>
> I have to run a program as a child process inside my python program and
> redirect it's output through a pipe to a parent program process.
> So, I wrote this:
>
> pipe = Popen('example_program', shell=True, bufsize=0, stdout=PIPE).stdout
>
> and it works great.
>
> Now, in parent program I need to wait for a some time and if a child
> (example_program) does not finish in that time, kill the child.
>
> How do I do that? Please help.
>
>
Try searching around for "threading.thread python" it should give you 
some clues, if you can't work through the info (it can be a bit hard to 
digest), just post here an example of your test code along with what you 
expected and what didn't happen.

-- 
mph


From pmaupin at gmail.com  Thu Mar 18 13:30:01 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Thu, 18 Mar 2010 10:30:01 -0700 (PDT)
Subject: Need to create subprocess...
References: <hntjrc$m6k$1@sunce.iskon.hr>
Message-ID: <7f37f154-e3f1-4666-8298-0bf352ebc480@r1g2000yqj.googlegroups.com>

On Mar 18, 11:17?am, "drstoka" <filip.popravi.stojmeno... at fer.hr>
wrote:
> Hello,
>
> I have to run a program as a child process inside my python program and
> redirect it's output through a pipe to a parent program process.
> So, I wrote this:
>
> pipe = Popen('example_program', shell=True, bufsize=0, stdout=PIPE).stdout
>
> and it works great.
>
> Now, in parent program I need to wait for a some time and if a child
> (example_program) does not finish in that time, kill the child.
>
> How do I do that? Please help.

I have a module that does this and more, but it only works on Linux:

http://code.google.com/p/rst2pdf/source/browse/trunk/rst2pdf/tests/execmgr.py

For usage examples, you can just execute it.  Also, see autotest.py in
the same directory.

Regards,
Pat


From jlundell at pobox.com  Thu Mar 18 14:01:18 2010
From: jlundell at pobox.com (JLundell)
Date: Thu, 18 Mar 2010 11:01:18 -0700 (PDT)
Subject: class inheritance
References: <3db38a5b-4ede-4a14-954e-f5c9be1008ee@a10g2000pri.googlegroups.com>
	<9bb4c1e7-858e-4ee6-870b-5a6549b6c496@b36g2000pri.googlegroups.com> 
	<05d0d40f-3fa0-4095-875d-777b49122d12@l12g2000prg.googlegroups.com> 
	<pan.2010.03.18.00.12.14@REMOVE.THIS.cybersource.com.au>
Message-ID: <25fb9401-74df-44fd-bc91-796a6b128151@a31g2000prd.googlegroups.com>

On Mar 17, 5:12?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 15 Mar 2010 16:34:35 -0700,JLundellwrote:
> > It's also unfortunate that Python doesn't have an approximately-equal
> > operator; it'd come in handy for floating-point applications while
> > preserving hash. If only there were a ~= or ? operator I could overload.
> > And ~ is unary, so no joy.
>
> Not everything needs to be a built-in, or an operator. This might be
> useful for you:
>
> http://code.activestate.com/recipes/577124-approximately-equal/
>
> Feedback welcome.
>
> --
> Steven

Thanks, Steven. I'd considered and rejected that a while ago, but on
reconsideration it's sounding like a better idea. Aside from
preserving the semantics of =, it makes the use of approximate
equality explicit in the code, and that's a plus for what I'm doing.
I'll give it a shot.


From news1234 at free.fr  Thu Mar 18 15:29:37 2010
From: news1234 at free.fr (News123)
Date: Thu, 18 Mar 2010 20:29:37 +0100
Subject: did anybody play with python and window mobile broadband?
In-Reply-To: <hnsrih$9oi$1@speranza.aioe.org>
References: <4ba1f067$0$4589$426a74cc@news.free.fr>
	<hnsrih$9oi$1@speranza.aioe.org>
Message-ID: <4ba27f21$0$23458$426a74cc@news.free.fr>

Hi Sanjiva,


Sanjiva P. wrote:
> On 03/18/2010 10:20 AM, News123 wrote:
>> I'm looking for examples:
>> - how to connect/disconnect  a mobile broadband device (currently I use
>> rasdial. not sure it's the best solution)
>> - to obtain the device's current mode (GPRS / EDGE / . . . )
>> - to obtain the current signal level
>>
>> Thanks a lot for any pointers
> 
> Well no examples,but most or all of it should work through AT commands.
Thanks, yes AT commands would be fine.
How can I send AT commands, while another application / connection
mnager is using the modem?


I just don't know how to send AT commands to a connected modem.


> 
> Did you try plugging the mobile broadband interface in?

What do you mean with pluggging in?

ctypes?
or something else?




bye


N


From news1234 at free.fr  Thu Mar 18 15:32:23 2010
From: news1234 at free.fr (News123)
Date: Thu, 18 Mar 2010 20:32:23 +0100
Subject: did anybody play with python and window mobile broadband?
In-Reply-To: <9fa65dc9-e9fc-4a35-a796-2e56980b63ac@t23g2000yqt.googlegroups.com>
References: <4ba1f067$0$4589$426a74cc@news.free.fr>
	<9fa65dc9-e9fc-4a35-a796-2e56980b63ac@t23g2000yqt.googlegroups.com>
Message-ID: <4ba27fc7$0$23458$426a74cc@news.free.fr>

Hy Eglyph,

eglyph at gmail.com wrote:
> On 18 ???, 11:20, News123 <news1... at free.fr> wrote:
>> I'd like to use a mobile broadband device with a windows python app.
>> Did anybody play already with python and the window mobile broadband
>> interface?
>>
> 
> There was a discussion on this subject in some local forum recently. I
> assume you're using PythonCE, right?

No I'm using C-Python on a small windows PC (Atom) with a USB Boradband
modem.

Could you forward me the discussion in case you remember the forum?


> 
> The best solution proposed there was to use ctypes and WinAPI. You can
> find a relatively high level APIs to set up a connection (without need
> to go too low level with AT commands) and make your own wrapper.
> 
> A good starting point can be found here: http://msdn.microsoft.com/en-us/library/bb416346.aspx
> (it's not the only way to to things, btw).

Thanks, I'll read into it.

bye

N




From wingusr at gmail.com  Thu Mar 18 15:36:20 2010
From: wingusr at gmail.com (TP)
Date: Thu, 18 Mar 2010 12:36:20 -0700
Subject: highlight words by regex in pdf files using python
In-Reply-To: <366c6f341003170753o36316de3ie13f11fad0b29900@mail.gmail.com>
References: <af0830ae-1d24-4db9-b721-d6602fedd540@15g2000yqi.googlegroups.com>
	<1fc72785-e527-4809-b5a1-43d78fe86f87@r27g2000yqn.googlegroups.com>
	<366c6f341003170753o36316de3ie13f11fad0b29900@mail.gmail.com>
Message-ID: <fe0b845a1003181236s586d41bcuacf5adbf817024b9@mail.gmail.com>

On Wed, Mar 17, 2010 at 7:53 AM, Peng Yu <pengyu.ut at gmail.com> wrote:
> On Tue, Mar 16, 2010 at 11:12 PM, Patrick Maupin <pmaupin at gmail.com> wrote:
>> On Mar 4, 6:57?pm, Peng Yu <pengyu... at gmail.com> wrote:
>>> I don't find a general pdf library in python that can do any
>>> operations on pdfs.
>>>
>>> I want to automatically highlight certain words (using regex) in a
>>> pdf. Could somebody let me know if there is a tool to do so in python?
>>
>> The problem with PDFs is that they can be quite complicated. ?There is
>> the outer container structure, which isn't too bad (unless the
>> document author applied encryption or fancy multi-object compression),
>> but then inside the graphics elements, things could be stored as
>> regular ASCII, or as fancy indexes into font-specific tables. ?Not
>> rocket science, but the only industrial-strength solution for this is
>> probably reportlab's pagecatcher.
>>
>> I have a library which works (primarily with the outer container) for
>> reading and writing, called pdfrw. ?I also maintain a list of other
>> PDF tools at http://code.google.com/p/pdfrw/wiki/OtherLibraries ?It
>> may be that pdfminer (link on that page) will do what you want -- it
>> is certainly trying to be complete as a PDF reader. ?But I've never
>> personally used pdfminer.
>>
>> One of my pdfrw examples at http://code.google.com/p/pdfrw/wiki/ExampleTools
>> will read in preexisting PDFs and write them out to a reportlab
>> canvas. ?This works quite well on a few very simple ASCII PDFs, but
>> the font handling needs a lot of work and probably won't work at all
>> right now on unicode. ?(But if you wanted to improve it, I certainly
>> would accept patches or give you commit rights!)
>>
>> That pdfrw example does graphics reasonably well. ?I was actually
>> going down that path for getting better vector graphics into rst2pdf
>> (both uniconvertor and svglib were broken for my purposes), but then I
>> realized that the PDF spec allows you to include a page from another
>> PDF quite easily (the spec calls it a form xObject), so you don't
>> actually need to parse down into the graphics stream for that. ?So,
>> right now, the best way to do vector graphics with rst2pdf is either
>> to give it a preexisting PDF (which it passes off to pdfrw for
>> conversion into a form xObject), or to give it a .svg file and invoke
>> it with -e inkscape, and then it will use inkscape to convert the svg
>> to a pdf and then go through the same path.
>
> Thank you for your long reply! But I'm not sure if you get my question or not.
>
> Acrobat can highlight certain words in pdfs. I could add notes to the
> highlighted words as well. However, I find that I frequently end up
> with highlighting some words that can be expressed by a regular
> expression.
>
> To improve my productivity, I don't want do this manually in Acrobat
> but rather do it in an automatic way, if there is such a tool
> available. People in reportlab mailing list said this is not possible
> with reportlab. And I don't see PyPDF can do this. If you know there
> is an API to for this purpose, please let me know. Thank you!
>
> Regards,
> Peng
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Take a look at the Acrobat SDK
(http://www.adobe.com/devnet/acrobat/?view=downloads). In particular
see the Acrobat Interapplication Communication information at
http://www.adobe.com/devnet/acrobat/interapplication_communication.html.

"Spell-checking a document" shows how to spell check a PDF using
visual basic at
http://livedocs.adobe.com/acrobat_sdk/9.1/Acrobat9_1_HTMLHelp/wwhelp/wwhimpl/common/html/wwhelp.htm?context=Acrobat9_HTMLHelp&file=IAC_DevApp_OLE_Support.100.17.html

"Working with annotations" shows how to add an annotation with visual
basic at http://livedocs.adobe.com/acrobat_sdk/9.1/Acrobat9_1_HTMLHelp/wwhelp/wwhimpl/common/html/wwhelp.htm?context=Acrobat9_HTMLHelp&file=IAC_DevApp_OLE_Support.100.16.html.

Presumably combining the two examples with Python's win32com should
allow you to do what you want.


From bettylive at gmail.com  Thu Mar 18 15:51:47 2010
From: bettylive at gmail.com (=?ISO-8859-1?Q?Bet=FCl?=)
Date: Thu, 18 Mar 2010 21:51:47 +0200
Subject: importing python project in my application
Message-ID: <a53024331003181251y23466b6cn9972471de33ab763@mail.gmail.com>

Hello All,


I am new this mail list.
I try to embedding python in C++.
I want to use this project's class http://gamera.informatik.hsnr.de/
It is a framework in python.
I want use Gamera 's classes,functions..etc in my c++ project.
I have information about embedding python in c++ but i just want to learn
that "how can i import to Gamera into the my c++ project"?


Please, help me.
it can be more questions after this :)

Best Regards
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From magicus23REMOVE-THIS at gmail.com  Thu Mar 18 16:44:18 2010
From: magicus23REMOVE-THIS at gmail.com (furlan)
Date: Thu, 18 Mar 2010 20:44:18 +0000 (UTC)
Subject: question about tkinter
References: <mailman.903.1268829586.23598.python-list@python.org>
	<hnqjoo$g4o$02$1@news.t-online.com>
	<mailman.906.1268832771.23598.python-list@python.org>
Message-ID: <hnu3b2$148$1@news.eternal-september.org>

On Wed, 17 Mar 2010 09:32:46 -0400, robert schaefer wrote:

> Peter,
> 
> Most of my life has been dealing with recalcitrant HAL's in one guise or
> another. These days, I think HAL has permanently taken up residence in
> Toyota's engine and brakes. "Stop the car Dave? Have you changed my oil
> or even washed me lately?" Some serious "sneak paths" are going on.

<snip>

Don't know if this will help and I had in a file in my Solutions folder
from 2008 the following:

If Tkinter does not seem to be loaded run:

sudo yum -y install python-tools

which will install Tkinter and dependencies.

HTH

ciao,
f

-- 
aa #2301
"I often work by avoidance."
-- Brian Eno


From sluggoster at gmail.com  Thu Mar 18 16:52:00 2010
From: sluggoster at gmail.com (Mike Orr)
Date: Thu, 18 Mar 2010 13:52:00 -0700 (PDT)
Subject: Need advice on starting a Python group
References: <hnb0d1$2el$1@reader1.panix.com>
Message-ID: <b47155a9-2441-4183-98d7-a4c8307362ea@q2g2000pre.googlegroups.com>

On Mar 11, 7:57?am, gb345 <gb... at invalid.com> wrote:
> I'm hoping to get advice from anyone with prior experience setting
> up a Python group.
>
> A friend of mine and I have been trying to start a
> scientific-programming-oriented Python group in our school (of
> medecine and bio research), with not much success.
>
> The main problem is attendance. ?Even though a *ton* of people have
> told us that it's a great idea, that they're *very* interested,
> and have asked to be added to our mailing list, the attendance to
> our first few meeting has never been more than 5, including my
> friend and I. ?Last time just he and I showed up.
>
> The second problem is getting content. ?The format we'd envisioned
> for this group was centered around code review (though not limited
> to it). ?The idea was that at every meeting a different member
> would show some code. ?This could be for any of a number of reasons,
> such as, for example, 1) illustrate a cool module or technique; 2)
> present a scientific research problem and how they used Python to
> solve it, or get help solving it; 3) get general feedback (e.g. on
> code clarity, software usability, module architecture, etc.). ?But
> in principle just about anything is OK: e.g. a talk on favorite
> Python resources, or a comparison of Python with some other language,
> or an overview of Python gotchas would all be fair game.

I've been involved in a Python users group since 2000, and have
attended or heard about a few others. The ones that have 20+ attendees
have a speaker every month. Our group is usually a show-and-tell and
open discussion, so we get around six people each month (but not the
same six). We've decided to solicit more talks as a way to increase
attendance.

I have never heard of a Python group focusing on code review, so I
don't know what attendance to expect for that. One problem is that
much of people's code is private at their workplace, and they can't
bring it to a meeting. I'd suggest expanding the focus a bit: code
review, writing unit tests for each other, pair programming, some open
"How do I do this in Python?" discussions, etc.

You're also limiting the pool of potential attendees by targeting one
institution. There are only a subset there who are interested in
Python, a smaller subset who can attend meetings, and an even smaller
subset who are willing to attend meetings even if they can. A citywide
group or at least bringing in other institutions would hopefully
increase attendance. Although it may be harder to keep the scientific
focus with that.  But on the other hand, here the specialized groups
are getting more attendance than the general groups are. The local
Plone and Django groups get more people than the Python group does.

--Mike


From mail at hellmutweber.de  Thu Mar 18 17:05:37 2010
From: mail at hellmutweber.de (Hellmut Weber)
Date: Thu, 18 Mar 2010 22:05:37 +0100
Subject: logging: local functions ==> loss of lineno
In-Reply-To: <hnaj9c$i0u$02$1@news.t-online.com>
References: <mailman.576.1268256192.23598.python-list@python.org>
	<hnaj9c$i0u$02$1@news.t-online.com>
Message-ID: <4BA295A1.70207@hellmutweber.de>

Am 11.03.2010 12:14, schrieb Peter Otten:
> Hellmut Weber wrote:
>
>> Logging works very well giving the filename and line number of the point
>> where it is called. As long as I use the loggers directly.
>> BUT when I have to wrap the logger call in some other function, I always
>> get file name and line number of the call of the logger inside the
>> wrapping function.
>>
>> Is there a possibility to get this information in this situation too?
>
> The official way is probably to write a custom Logger class that overrides
> the findCaller() method.
>
> Below is a hack that monkey-patches the logging._srcfile attribute to ignore
> user-specified modules in the call stack:
>
> $ cat wrapper.py
> import logging
> import os
> import sys
>
> logger = logging.getLogger()
>
> class SrcFile(object):
>      def __init__(self, exclude_files):
>          self.files = set(exclude_files)
>      def __eq__(self, other):
>          return other in self.files
>
> def fixname(filename):
>      if filename.lower().endswith((".pyc", ".pyo")):
>          filename = filename[:-4] + ".py"
>      return os.path.normcase(filename)
>
> if "--monkey" in sys.argv:
>      print "patching"
>      logging._srcfile = SrcFile([logging._srcfile, fixname(__file__)])
>
> def warn(*args, **kw):
>      logger.warn(*args, **kw)
>
> $ cat main.py
> import logging
> logging.basicConfig(format="%(filename)s<%(lineno)s>: %(message)s")
> import wrapper
> wrapper.warn("foo")
> wrapper.warn("bar")
> wrapper.warn("baz")
>
> $ python main.py
> wrapper.py<23>: foo
> wrapper.py<23>: bar
> wrapper.py<23>: baz
>
> $ python main.py --monkey
> patching
> main.py<4>: foo
> main.py<5>: bar
> main.py<6>: baz
>
> $ python -V
> Python 2.6.4
>
> Peter

Hi Peter,
your hack is exactly what I was looking for.
It permits to configure my logging messages as I want, e.g. using 
different colors for different classes of messages.

I do not yet understand all details WHY it is working but suppose some 
study of the logging module will help me to understand.

Thank you very much

-- 
Dr. Hellmut Weber         mail at hellmutweber.de
Degenfeldstra?e 2         tel   +49-89-3081172
D-80803 M?nchen-Schwabing mobil +49-172-8450321
please: No DOCs, no PPTs. why: tinyurl.com/cbgq



From tjreedy at udel.edu  Thu Mar 18 17:13:18 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 18 Mar 2010 17:13:18 -0400
Subject: Nested Scopes unintended behaviour ?
In-Reply-To: <921f09da-bf41-4306-aca5-19baa70dd2b2@e7g2000yqf.googlegroups.com>
References: <7a110632-d6c5-446b-a34b-95548fadb2f9@r27g2000yqn.googlegroups.com>	<hnqtbp$bbb$1@dough.gmane.org>	<mailman.929.1268857761.23598.python-list@python.org>
	<921f09da-bf41-4306-aca5-19baa70dd2b2@e7g2000yqf.googlegroups.com>
Message-ID: <hnu51h$p0l$1@dough.gmane.org>

On 3/18/2010 6:21 AM, Michael Sparks wrote:

> After hearing it's expected behaviour in 2.6 it's clear that assigning
> a name to a value declares the variable to be local,

unless there is a global/nonlocal declaration

  and that unlike
> much of python (but like yield) this appears based on static analysis
> of the function declaration, rather than dynamic.

The language definition requires two passes after parsing.
One collects names and determines their scope (and looks for yield). The 
second generates code.
This allows the local namespace to be implemented as an array rather 
than a dict, so that local name lookup is an array index operation 
rather than a dict lookup operation. This is somewhat made visible by 
the dis module

 >>> from dis import dis
 >>> a = 1
 >>> def f():
	b = 2
	return a,b

 >>> dis(f)
   2           0 LOAD_CONST               1 (2)
               3 STORE_FAST               0 (b)

   3           6 LOAD_GLOBAL              0 (a)
               9 LOAD_FAST                0 (b)
              12 BUILD_TUPLE              2
              15 RETURN_VALUE

STORE/LOAD_FAST means store/load_local. Constants (2 in this case) are 
stored in the same array. There is apparently a separate array of global 
names, as opposed to local values.

Terry Jan Reedy



From aahz at pythoncraft.com  Thu Mar 18 18:06:00 2010
From: aahz at pythoncraft.com (Aahz)
Date: 18 Mar 2010 15:06:00 -0700
Subject: sqlite3, memory db and multithreading
References: <hnt81m$fsi$1@news.task.gda.pl>
Message-ID: <hnu848$oo7$1@panix5.panix.com>

In article <hnt81m$fsi$1 at news.task.gda.pl>,
=?UTF-8?B?a3LDs2xld25h?=  <kr?lewna at ee.pl> wrote:
>
>The problem is simple: I have multiple threads within one program. At 
>least 2 threads have to have access to in-memory sqlite database. It is 
>not possible to pass sqlite objects to those threads because an 
>exception is rised:
>
>ProgrammingError: SQLite objects created in a thread can only be used in 
>that same thread.The object was created in thread id -1219066176 and 
>this is thread id -1224475792
>
>Is there any EASY way to use this in-memory db in many threads? Creating 
>another connection is not a solution as it creates completely new db 
>instead of connecting to the existing one.

You probably need to serialize access to the database through one thread.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From slais-www at ucl.ac.uk  Thu Mar 18 18:29:41 2010
From: slais-www at ucl.ac.uk (djc)
Date: Thu, 18 Mar 2010 22:29:41 +0000
Subject: should writing Unicode files be so slow
Message-ID: <hnu9gl$fg7e$1@uns-a.ucl.ac.uk>

I have a simple program to read a text (.csv) file and split it into
several smaller files. Tonight I decided to write a unicode variant and was
surprised at the difference in performance. Is there a better way?

> from __future__ import with_statement
> import codecs
> 
> def _rowreader(filename, separator='\t'):
>     """Generator for iteration over potentially large file."""
>     with codecs.open(filename, 'rU', 'utf-8', 'backslashreplace') as tabfile:  
>         for row in tabfile:
>             yield [v.strip() for v in row.split(separator)]  
> 
> def generator_of_output(source_of_lines):
>     for line in source_of_lines:
>         for result in some_function(line):
>             yield result
> 
> def coroutine(outfile_prefix, outfile_suffix, sep='\t'):
>     outfile = '%s_%s.txt'%  (outfile_prefix, outfile_suffix)
>     with codecs.open(outfile, 'w', 'utf-8') as out_part:
>         while True:
>             line = (yield)
>             out_part.write(sep.join(line) + '\n')
> 
> def _file_to_files(infile, outfile_prefix, column, sep):
>     column_values = dict()
>     for line in _rowreader(infile, sep):
>         outfile_suffix = line[column].strip('\'\"')
>         if  outfile_suffix  in  column_values:
>             column_values[outfile_suffix].send(line)
>         else:
>             file_writer = coroutine(outfile_prefix, outfile_suffix, sep)
>             file_writer.next()
>             file_writer.send(line)
>             column_values[outfile_suffix] = file_writer
>     for file_writer in column_values.itervalues():
>         file_writer.close()    

the plain version is the same except for
>     with open(filename, 'rU') as tabfile:
>     with open(outfile, 'wt') as out_part:


The difference:
> "uid","timestamp","taskid","inputid","value"
> "15473178739336026589","2010-02-18T20:50:15+0000","11696870405","73827093507","83523277829"
> "15473178739336026589","2010-02-18T20:50:15+0000","11696870405","11800677379","12192844803"
> "15473178739336026589","2010-02-18T20:50:15+0000","11696870405","31231839235","52725552133"
> 
> sysweb at Bembo:~/UCLC/bbc/wb2$ wc -l wb.csv
> 9293271 wb.csv
> 
> normal version
> sysweb at Bembo:~/UCLC$ time ~/UCL/toolkit/file_splitter.py -o tt --separator comma -k 2 wb.csv
> 
> real	0m43.714s
> user	0m37.370s
> sys	0m2.732s
> 
> unicode version
> sysweb at Bembo:~/UCLC$ time ./file_splitter.py -o t --separator comma -k 2 wb.csv
> 
> real	4m8.695s
> user	3m19.236s
> sys	0m39.262s



-- 
David Clark, MSc, PhD.              UCL Centre for Publishing
                                    Gower Str London WCIE 6BT
What sort of web animal are you?
            <https://www.bbc.co.uk/labuk/experiments/webbehaviour>


From davea at ieee.org  Thu Mar 18 19:13:59 2010
From: davea at ieee.org (Dave Angel)
Date: Thu, 18 Mar 2010 18:13:59 -0500
Subject: Python bindings tutorial
In-Reply-To: <hnqgdr$prr$1@news.eternal-september.org>
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>	<mailman.863.1268766752.23598.python-list@python.org>	<98447f7e-64db-4a10-b19e-685f5b079cf6@l25g2000yqd.googlegroups.com>	<hnq7qt$kl0$1@dough.gmane.org>	<mailman.898.1268824466.23598.python-list@python.org>
	<hnqgdr$prr$1@news.eternal-september.org>
Message-ID: <4BA2B3B7.70309@ieee.org>

Alf P. Steinbach wrote:
> * Dave Angel:
>> Stefan Behnel wrote:
>>> <div class="moz-text-flowed" style="font-family: 
>>> -moz-fixed">MikeLisanke at gmail.com, 17.03.2010 10:08:
>>>> Its interesting you've mentioned the hard work involved in this
>>>> interface (binding to an EXE instead of a DLL). A year or more ago I
>>>> was looking at interfacing IPMITOOL to python. Do to the problems
>>>> incurred with swig/python I switched to a running the process through
>>>> its command-line interface. I always felt the problems in interfacing
>>>> python to an EXE should be worked on (to minimize them), making the
>>>> direct use of an EXE API's a routine task. I understand some of the
>>>> problems using an EXE (not running all of its startup code   but
>>>> enough for its proper operation). Have you found this a recurring
>>>> question? Thanks.
>>>
>>> I think the point here is that executable binaries are not supposed 
>>> to be used as libraries. Libraries are. That's the difference 
>>> between a DLL and an executable in the first place. To run an 
>>> executable, execute it. The subprocess module is the tool of choice 
>>> here. To use a DLL, link against it.
>>>
>>> Stefan
>>>
>> There's no real reason parts of an exe cannot be exported, same as a 
>> dll.  They are in fact the same structure.  And in fact many other 
>> files in the Windows environment are also the same structure, from 
>> fonts to ocx's
>>
>> Saying they're "not supposed to be used" is like saying that a python 
>> module should not have an
>>
>> if __name__ == "__main__":
>>
>> section.  After all, who could want to both run a file, and import 
>> the same file??
>
> A Windows DLL has defined initialization and cleanup per process and 
> per thread.
>
> This means that e.g. static variables can be properly initialized when 
> you load the DLL in order to use its functions (I'm skipping 
> discussion of subtle problems, but that's the essence).
>
> A Windows EXE has (only) a single entry point which is for process 
> startup. It invokes the EXE's behavior-as-a-program. There is no way 
> to use it to e.g. initialize static variables in order to use exported 
> functions.
>
> Hence Mike Lisanke's idea of "not running all of its startup code but 
> enough for its proper operation" is generally not possible.
>
> An EXE can be used as a kind of server, /if/ it is designed for that. 
> In particular it can be a COM server, allowing access of its 
> functionality from any COM-enabled binding, which for Python would 
> mean OLE Automation (COM, OLE, Automation: this is Microsoft 
> technology, we're talking Windows EXEs here). But a Python binding to 
> EXEs in general can't, as far as I can see, make assumptions about any 
> particular kind of server being implemented by the EXE.
>
>
> Cheers & hth.,
>
> - Alf
>
>
I'm not talking about COM servers, which run in a separate process.  
Only about calling functionality that happens to be encoded in an .EXE file.

You're trying to generalize what I said.  I never said you could call 
into any .EXE file, just that calling into one is not infeasible.  
You're describing using an .EXE written using the Microsoft C compiler 
and/or libraries, not a Windows .EXE in general.  In any case, whenever 
you link to a module written in a different environment, you'll have 
restrictions.  Chief among them is the use of a compatible memory model, 
the stack conventions, the allocators, and so on..  Solving the thread 
issue is probably the easiest one to fix.

I'm not recommending it, just refuting the "not supposed to" quote above.

DaveA



From alfps at start.no  Thu Mar 18 19:56:35 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Fri, 19 Mar 2010 00:56:35 +0100
Subject: Python bindings tutorial
In-Reply-To: <mailman.961.1268954057.23598.python-list@python.org>
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>	<mailman.863.1268766752.23598.python-list@python.org>	<98447f7e-64db-4a10-b19e-685f5b079cf6@l25g2000yqd.googlegroups.com>	<hnq7qt$kl0$1@dough.gmane.org>	<mailman.898.1268824466.23598.python-list@python.org>	<hnqgdr$prr$1@news.eternal-september.org>
	<mailman.961.1268954057.23598.python-list@python.org>
Message-ID: <hnuejm$d6a$1@news.eternal-september.org>

* Dave Angel:
> Alf P. Steinbach wrote:
>> * Dave Angel:
>>> Stefan Behnel wrote:
>>>> <div class="moz-text-flowed" style="font-family: 
>>>> -moz-fixed">MikeLisanke at gmail.com, 17.03.2010 10:08:
>>>>> Its interesting you've mentioned the hard work involved in this
>>>>> interface (binding to an EXE instead of a DLL). A year or more ago I
>>>>> was looking at interfacing IPMITOOL to python. Do to the problems
>>>>> incurred with swig/python I switched to a running the process through
>>>>> its command-line interface. I always felt the problems in interfacing
>>>>> python to an EXE should be worked on (to minimize them), making the
>>>>> direct use of an EXE API's a routine task. I understand some of the
>>>>> problems using an EXE (not running all of its startup code   but
>>>>> enough for its proper operation). Have you found this a recurring
>>>>> question? Thanks.
>>>>
>>>> I think the point here is that executable binaries are not supposed 
>>>> to be used as libraries. Libraries are. That's the difference 
>>>> between a DLL and an executable in the first place. To run an 
>>>> executable, execute it. The subprocess module is the tool of choice 
>>>> here. To use a DLL, link against it.
>>>>
>>>> Stefan
>>>>
>>> There's no real reason parts of an exe cannot be exported, same as a 
>>> dll.  They are in fact the same structure.  And in fact many other 
>>> files in the Windows environment are also the same structure, from 
>>> fonts to ocx's
>>>
>>> Saying they're "not supposed to be used" is like saying that a python 
>>> module should not have an
>>>
>>> if __name__ == "__main__":
>>>
>>> section.  After all, who could want to both run a file, and import 
>>> the same file??
>>
>> A Windows DLL has defined initialization and cleanup per process and 
>> per thread.
>>
>> This means that e.g. static variables can be properly initialized when 
>> you load the DLL in order to use its functions (I'm skipping 
>> discussion of subtle problems, but that's the essence).
>>
>> A Windows EXE has (only) a single entry point which is for process 
>> startup. It invokes the EXE's behavior-as-a-program. There is no way 
>> to use it to e.g. initialize static variables in order to use exported 
>> functions.
>>
>> Hence Mike Lisanke's idea of "not running all of its startup code but 
>> enough for its proper operation" is generally not possible.
>>
>> An EXE can be used as a kind of server, /if/ it is designed for that. 
>> In particular it can be a COM server, allowing access of its 
>> functionality from any COM-enabled binding, which for Python would 
>> mean OLE Automation (COM, OLE, Automation: this is Microsoft 
>> technology, we're talking Windows EXEs here). But a Python binding to 
>> EXEs in general can't, as far as I can see, make assumptions about any 
>> particular kind of server being implemented by the EXE.
>>
> I'm not talking about COM servers, which run in a separate process.  
> Only about calling functionality that happens to be encoded in an .EXE 
> file.
> 
> You're trying to generalize what I said.  I never said you could call 
> into any .EXE file, just that calling into one is not infeasible.

Well, true. And I'm sorry if my reply sounded as a misrepresentation. I haven't 
tried this calling-a-function-in-an-exe (since 16-bit Windows, that is!, but 
that was very different), but I can imagine two such cases:

   (1) a function f is exported by the EXE, and f doesn't depend on anything
       but its arguments and does not use any static storage, or

   (2) a DLL loaded by the EXE calls back into the EXE, which could work
       because then everything's initialized (however, there are better ways).

But these are very special cases where one really has to know what one is doing.

As Gabriel Genellina wrote up-thread, "you *could* do that if you work hard 
enough, but that's not how things are usually done".

That said, in Windows the least uncommon reason to load an EXE as a DLL is, IME, 
to access resource data in the EXE. Tip for that: the module handle, casted to 
appropriate pointer type, points to the start of the loaded image (great for 
accessing e.g. version info resource). I think this is still undocumented...


> You're describing using an .EXE written using the Microsoft C compiler 
> and/or libraries, not a Windows .EXE in general.  In any case, whenever 
> you link to a module written in a different environment, you'll have 
> restrictions.  Chief among them is the use of a compatible memory model, 
> the stack conventions, the allocators, and so on..  Solving the thread 
> issue is probably the easiest one to fix.
> 
> I'm not recommending it, just refuting the "not supposed to" quote above.

Again, I'm sorry if my reply sounded as a misrepresentation.

I just tried to make the solution-constraining technical facts available, 
addressing Mike's "making the direct use of an EXE API's a routine task".

I think we're all in (violent?) agreement on this. :-)


Cheers,

- Alf


From clockworksaint at gmail.com  Thu Mar 18 20:13:32 2010
From: clockworksaint at gmail.com (Weeble)
Date: Thu, 18 Mar 2010 17:13:32 -0700 (PDT)
Subject: GC is very expensive: am I doing something wrong?
Message-ID: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>

I am loading a dictionary from a text file and constructing a trie
data structure in memory. However, it takes longer than I'm happy with
- about 12 seconds on my computer. I profiled it, came up with some
clever ideas to cut down on the work (such as by exploiting the fact
that the dictionary is sorted) and was only able to shave a small
fraction of the time off. However, then I tried calling gc.disable()
before loading the trie and it halved the running time! I was
surprised. Is that normal? I thought that the cost of garbage
collection would be in some way proportional to the amount of garbage
created, but I didn't think I was creating any: as far as I can tell
the only objects deallocated during the load are strings, which could
not be participating in cycles.

I have spent a lot of time in C#, where the standard advice is not to
mess about with the garbage collector because you'll probably just
make things worse. Does that advice apply in Python? Is it a bad idea
to call gc.disable() before loading the trie and then enable it again
afterwards? Does the fact that the garbage collector is taking so much
time indicate I'm doing something particularly bad here? Is there some
way to give the garbage collector a hint that the whole trie is going
to be long-lived and get it promoted straight to generation 2 rather
than scanning it over and over?

$ python
Python 2.6.4 (r264:75706, Dec  7 2009, 18:43:55)
[GCC 4.4.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>
$ time python -c "import
trie;t=trie.Trie();t.load(open('sowpods.txt'))"

real	0m12.523s
user	0m12.380s
sys	0m0.140s
$ time python -c "import
trie;t=trie.Trie();t.load(open('sowpods.txt'))"

real	0m12.592s
user	0m12.480s
sys	0m0.110s
$ time python -c "import gc;gc.disable();import
trie;t=trie.Trie();t.load(open('sowpods.txt'))"

real	0m6.176s
user	0m5.980s
sys	0m0.190s
$ time python -c "import gc;gc.disable();import
trie;t=trie.Trie();t.load(open('sowpods.txt'))"

real	0m6.331s
user	0m5.530s
sys	0m0.170s


=== trie.py ===

class Trie(object):
    __slots__=("root", "active")
    def __init__(self):
        self.root=[]
        self.active=False
    def insert(self, word):
        if len(word) == 0:
            self.active=True
        else:
            head = word[0]
            for ch, child in reversed(self.root):
                if ch == head:
                    child.insert(word[1:])
                    return
            child = Trie()
            self.root.append((head, child))
            child.insert(word[1:])
    def seek(self, word):
        if len(word) == 0:
            return self
        head = word[0]
        for ch, child in self.root:
            if ch == head:
                return child.seek(word[1:])
        return EMPTY_TRIE
    def load(self, file):
        for line in file:
            self.insert(line.strip().lower())
    def empty(self):
        return (not self.root) and not self.active
    def endings(self, prefix=""):
        if self.active:
            yield prefix
        for ch, child in self.root:
            for ending in child.endings(prefix+ch):
                yield ending

EMPTY_TRIE = Trie()


From contact at xavierho.com  Thu Mar 18 20:24:22 2010
From: contact at xavierho.com (Xavier Ho)
Date: Fri, 19 Mar 2010 10:24:22 +1000
Subject: GC is very expensive: am I doing something wrong?
In-Reply-To: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
Message-ID: <2d56febf1003181724t377741eem900a456d73b58cac@mail.gmail.com>

Weeble,

Try to use the full arguments of insert(i, x), instead of using list slices.
Every time you create a slice, Python copies the list into a new memory
location with the sliced copy. That's probably a big performance impact
there if done recursively.

My 2cp,
Xav


On Fri, Mar 19, 2010 at 10:13 AM, Weeble <clockworksaint at gmail.com> wrote:

> I am loading a dictionary from a text file and constructing a trie
> data structure in memory. However, it takes longer than I'm happy with
> - about 12 seconds on my computer. I profiled it, came up with some
> clever ideas to cut down on the work (such as by exploiting the fact
> that the dictionary is sorted) and was only able to shave a small
> fraction of the time off. However, then I tried calling gc.disable()
> before loading the trie and it halved the running time! I was
> surprised. Is that normal? I thought that the cost of garbage
> collection would be in some way proportional to the amount of garbage
> created, but I didn't think I was creating any: as far as I can tell
> the only objects deallocated during the load are strings, which could
> not be participating in cycles.
>
> I have spent a lot of time in C#, where the standard advice is not to
> mess about with the garbage collector because you'll probably just
> make things worse. Does that advice apply in Python? Is it a bad idea
> to call gc.disable() before loading the trie and then enable it again
> afterwards? Does the fact that the garbage collector is taking so much
> time indicate I'm doing something particularly bad here? Is there some
> way to give the garbage collector a hint that the whole trie is going
> to be long-lived and get it promoted straight to generation 2 rather
> than scanning it over and over?
>
> $ python
> Python 2.6.4 (r264:75706, Dec  7 2009, 18:43:55)
> [GCC 4.4.1] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>>
> $ time python -c "import
> trie;t=trie.Trie();t.load(open('sowpods.txt'))"
>
> real    0m12.523s
> user    0m12.380s
> sys     0m0.140s
> $ time python -c "import
> trie;t=trie.Trie();t.load(open('sowpods.txt'))"
>
> real    0m12.592s
> user    0m12.480s
> sys     0m0.110s
> $ time python -c "import gc;gc.disable();import
> trie;t=trie.Trie();t.load(open('sowpods.txt'))"
>
> real    0m6.176s
> user    0m5.980s
> sys     0m0.190s
> $ time python -c "import gc;gc.disable();import
> trie;t=trie.Trie();t.load(open('sowpods.txt'))"
>
> real    0m6.331s
> user    0m5.530s
> sys     0m0.170s
>
>
> === trie.py ===
>
> class Trie(object):
>    __slots__=("root", "active")
>    def __init__(self):
>        self.root=[]
>        self.active=False
>    def insert(self, word):
>        if len(word) == 0:
>            self.active=True
>        else:
>            head = word[0]
>            for ch, child in reversed(self.root):
>                if ch == head:
>                    child.insert(word[1:])
>                    return
>            child = Trie()
>            self.root.append((head, child))
>            child.insert(word[1:])
>    def seek(self, word):
>        if len(word) == 0:
>            return self
>        head = word[0]
>        for ch, child in self.root:
>            if ch == head:
>                return child.seek(word[1:])
>        return EMPTY_TRIE
>    def load(self, file):
>        for line in file:
>            self.insert(line.strip().lower())
>    def empty(self):
>        return (not self.root) and not self.active
>    def endings(self, prefix=""):
>        if self.active:
>            yield prefix
>        for ch, child in self.root:
>            for ending in child.endings(prefix+ch):
>                yield ending
>
> EMPTY_TRIE = Trie()
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From tjreedy at udel.edu  Thu Mar 18 20:33:40 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 18 Mar 2010 20:33:40 -0400
Subject: GC is very expensive: am I doing something wrong?
In-Reply-To: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
Message-ID: <hnugp4$qp$1@dough.gmane.org>

On 3/18/2010 8:13 PM, Weeble wrote:
>   I thought that the cost of garbage
> collection would be in some way proportional to the amount of garbage
> created, but I didn't think I was creating any: as far as I can tell
> the only objects deallocated during the load are strings, which could
> not be participating in cycles.
>
> I have spent a lot of time in C#, where the standard advice is not to
> mess about with the garbage collector because you'll probably just
> make things worse. Does that advice apply in Python? Is it a bad idea
> to call gc.disable() before loading the trie and then enable it again
> afterwards?

I believe not. It is known that certain patterns of object creation and 
destruction can lead to bad gc behavior. No one has discovered a setting 
of the internal tuning parameters for which there are no bad patterns 
and I suspect there are not any such. This does not negate Xavier's 
suggestion that a code change might also solve your problem.

tjr



From brandonc530 at gmail.com  Thu Mar 18 21:00:47 2010
From: brandonc530 at gmail.com (Brandon Conner)
Date: Thu, 18 Mar 2010 20:00:47 -0500
Subject: Truoble With A Search Script for ImageBin.org
Message-ID: <3020ae661003181800u55a5a654v7be4a524123eec65@mail.gmail.com>

Hey Pythoners,

its my first post here, yay!

I'm trying to develop a script that will return the results of a POST
request that should list all images uploaded by a user.  However, when i run
the script, i get returned the HTML of the page with the search form.  I am
wondering what am i doing incorrectly?  Is it something I'm doing or is the
imagebin server rejecting my request?

here's the code:

import urllib
import urllib2
url = 'http://imagebin.org/index.php?page=search'
values = {'search_for' : 'blah', 'field' : 'Nickname'}
data = urllib.urlencode(values)
request = urllib2.Request(url, data)
response = urllib2.urlopen(request)
page = response.read()
print page

tks, pythons great
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From ben+python at benfinney.id.au  Thu Mar 18 21:49:56 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 19 Mar 2010 12:49:56 +1100
Subject: should writing Unicode files be so slow
References: <hnu9gl$fg7e$1@uns-a.ucl.ac.uk>
Message-ID: <8739zxw057.fsf@benfinney.id.au>

djc <slais-www at ucl.ac.uk> writes:

> I have a simple program to read a text (.csv) file

Could you please:

* simplify it further: make a minimal version that demonstrates the
  difference you're seeing, without any extraneous stuff that doesn't
  appear to affect the result.

* make it complete: the code you've shown doesn't do anything except
  define some functions.

In other words: please reduce it to a complete, minimal example that we
can run to see the same behaviour you're seeing.

-- 
 \        ?If we ruin the Earth, there is no place else to go. This is |
  `\    not a disposable world, and we are not yet able to re-engineer |
_o__)                      other planets.? ?Carl Sagan, _Cosmos_, 1980 |
Ben Finney


From clp2 at rebertia.com  Thu Mar 18 22:07:05 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Thu, 18 Mar 2010 19:07:05 -0700
Subject: import antigravity
In-Reply-To: <hnslv3$jjk$2@lust.ihug.co.nz>
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
	<hnslv3$jjk$2@lust.ihug.co.nz>
Message-ID: <50697b2c1003181907x515d29bdsad5208b59420a472@mail.gmail.com>

On Thu, Mar 18, 2010 at 12:49 AM, Lawrence D'Oliveiro
<no-spam at extra.super.obfuscation> wrote:
> I see that you published my unobfuscated e-mail address on USENET for all to
> see. I obfuscated it for a reason, to keep the spammers away. I'm assuming
> this was a momentary lapse of judgement, for which I expect an apology.

My apologies to you then. In my own defense, I will say this is the
first complaint I can recall getting about unmungeing the "To:" header
when replying to someone on python-list. To ensure your address's
privacy in the future, either using a disposable address or putting a
/completely/ invalid and unrelated address in the "To:" header are
some possible options.

Regards,
Chris
--
This is one of the pitfalls of mail-news gateways I suppose.


From steve at holdenweb.com  Thu Mar 18 22:43:38 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 18 Mar 2010 22:43:38 -0400
Subject: Truoble With A Search Script for ImageBin.org
In-Reply-To: <3020ae661003181800u55a5a654v7be4a524123eec65@mail.gmail.com>
References: <3020ae661003181800u55a5a654v7be4a524123eec65@mail.gmail.com>
Message-ID: <hnuod2$ikf$1@dough.gmane.org>

Brandon Conner wrote:
> Hey Pythoners,
> 
> its my first post here, yay!
> 
> I'm trying to develop a script that will return the results of a POST
> request that should list all images uploaded by a user.  However, when i
> run the script, i get returned the HTML of the page with the search
> form.  I am wondering what am i doing incorrectly?  Is it something I'm
> doing or is the imagebin server rejecting my request?
> 
> here's the code:
> 
> import urllib
> import urllib2
> url = 'http://imagebin.org/index.php?page=search'
> values = {'search_for' : 'blah', 'field' : 'Nickname'}
> data = urllib.urlencode(values)
> request = urllib2.Request(url, data)
> response = urllib2.urlopen(request)
> page = response.read()
> print page
> 
> tks, pythons great
> 
You need to tell the browser (in an HTTP header) that what you are
sending is HTML. Try putting

print "Content-Type: text/html\n"

at the start of your script.

regards
 Steve

-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From john at castleamber.com  Thu Mar 18 22:50:51 2010
From: john at castleamber.com (John Bokma)
Date: Thu, 18 Mar 2010 20:50:51 -0600
Subject: import antigravity
References: <hnnclk$eud$1@lust.ihug.co.nz>
	<mailman.820.1268725930.23598.python-list@python.org>
	<hnslv3$jjk$2@lust.ihug.co.nz>
Message-ID: <87iq8tc9dg.fsf@castleamber.com>

Lawrence D'Oliveiro <ldo at geek-central.gen.new_zealand> writes:

> In message <mailman.820.1268725930.23598.python-list at python.org>, Chris 
> Rebert wrote:
>
> I see that you published my unobfuscated e-mail address on USENET for all to
> see. I obfuscated it for a reason, to keep the spammers away. I'm assuming
> this was a momentary lapse of judgement, for which I expect an apology.
> Otherwise, it becomes grounds for an abuse complaint to your ISP. 

Ha ha ha! Get a life. You're using a non-existant tld. I recommend to
use .invalid instead, e.g.

ldo at geek-central.gen.nz.invalid

And Chris can make sure that his unobfuscating code doesn't run if the
tld is invalid.


-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From cs at zip.com.au  Thu Mar 18 22:57:19 2010
From: cs at zip.com.au (Cameron Simpson)
Date: Fri, 19 Mar 2010 13:57:19 +1100
Subject: Truoble With A Search Script for ImageBin.org
In-Reply-To: <hnuod2$ikf$1@dough.gmane.org>
References: <hnuod2$ikf$1@dough.gmane.org>
Message-ID: <20100319025719.GA20465@cskk.homeip.net>

On 18Mar2010 22:43, Steve Holden <steve at holdenweb.com> wrote:
| Brandon Conner wrote:
| > I'm trying to develop a script that will return the results of a POST
| > request that should list all images uploaded by a user.  However, when i
| > run the script, i get returned the HTML of the page with the search
| > form.  I am wondering what am i doing incorrectly?  Is it something I'm
| > doing or is the imagebin server rejecting my request?
| > 
| > here's the code:
| > 
| > import urllib
| > import urllib2
| > url = 'http://imagebin.org/index.php?page=search'
| > values = {'search_for' : 'blah', 'field' : 'Nickname'}
| > data = urllib.urlencode(values)
| > request = urllib2.Request(url, data)
| > response = urllib2.urlopen(request)
| > page = response.read()
| > print page
| > 
| > tks, pythons great
| > 
| You need to tell the browser (in an HTTP header) that what you are
| sending is HTML. Try putting
| 
| print "Content-Type: text/html\n"
| 
| at the start of your script.

I think it may need to be "application/x-www-form-urlencoded", not
text/html. But otherwise, yes, missing Content-Type.

And the request method needs to be POST; I expect the code above will be
using GET unless told not to.

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

There's no trick to being a humorist when you have the whole government
working for you.        - Will Rogers


From rowland at river2sea.org  Thu Mar 18 23:25:48 2010
From: rowland at river2sea.org (Rowland Smith)
Date: Thu, 18 Mar 2010 23:25:48 -0400
Subject: example of ssl with SimpleXMLRPCServer in 2.6?
Message-ID: <2010031823254816807-rowland@river2seaorg>

Anyone have an example of using the new ssl module with 
SimpleXMLRPCServer in 2.6?

Thanks,
-- 
-Rowland



From timr at probo.com  Fri Mar 19 00:13:25 2010
From: timr at probo.com (Tim Roberts)
Date: Thu, 18 Mar 2010 21:13:25 -0700
Subject: Python bindings tutorial
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>	<mailman.863.1268766752.23598.python-list@python.org>	<98447f7e-64db-4a10-b19e-685f5b079cf6@l25g2000yqd.googlegroups.com>
	<hnq7qt$kl0$1@dough.gmane.org>
	<mailman.898.1268824466.23598.python-list@python.org>
Message-ID: <iau5q5tm3dkligk85l9upii0dm14frfvrb@4ax.com>

Dave Angel <davea at ieee.org> wrote:
>>
>There's no real reason parts of an exe cannot be exported, same as a 
>dll.  They are in fact the same structure.  And in fact many other files 
>in the Windows environment are also the same structure, from fonts to ocx's

Well, there IS a fundamental difference.  EXEs and DLLs and the like do all
have the same format.  They all have a "transfer address", where execution
begins.  That's the key problem.  With a DLL, the transfer address goes to
a DllMain, where certain DLL initialization is done, preparing the other
entry points for use.  With an EXE, the transfer address goes to "main".

So, when you load an EXE as a DLL, you will be RUNNING the program.  That's
is usually not what you want.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From nagle at animats.com  Fri Mar 19 00:33:52 2010
From: nagle at animats.com (John Nagle)
Date: Thu, 18 Mar 2010 21:33:52 -0700
Subject: sqlite3, memory db and multithreading
In-Reply-To: <hnt81m$fsi$1@news.task.gda.pl>
References: <hnt81m$fsi$1@news.task.gda.pl>
Message-ID: <4ba2fa0d$0$1598$742ec2ed@news.sonic.net>

kr?lewna wrote:
> The problem is simple: I have multiple threads within one program. At 
> least 2 threads have to have access to in-memory sqlite database. It is 
> not possible to pass sqlite objects to those threads because an 
> exception is rised:
> 
> ProgrammingError: SQLite objects created in a thread can only be used in 
> that same thread.The object was created in thread id -1219066176 and 
> this is thread id -1224475792
> 
> Is there any EASY way to use this in-memory db in many threads? Creating 
> another connection is not a solution as it creates completely new db 
> instead of connecting to the existing one.

    Recognize that sqlite is for "lite" database work.  If you're running
some massively concurrent database application, you need something heavier,
like MySQL or Postgres.  "sqlite" has a simplistic locking strategy.
Locking is done by file-level locking, and you can have one UPDATE/INSERT
operations, or any numnber of SELECTs, at a time.  Lock conflicts are
handled by wait and retry, which is slow.

    The big databases are much smarter about figuring out which operations
can safely be done in parallel, do much more query optimization, and
handle high transaction volumes much better than sqlite.

    You use sqlite for configuration files, your personal databases, and
other small stuff.  You run your Web 2.0 site on MySQL or Postgres.
You run your Fortune 1000 company on Oracle.

					John Nagle


From pmaupin at gmail.com  Fri Mar 19 00:44:19 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Thu, 18 Mar 2010 21:44:19 -0700 (PDT)
Subject: GC is very expensive: am I doing something wrong?
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
Message-ID: <7a3a0709-2325-45a3-9cb5-381a7a1ff31f@t41g2000yqt.googlegroups.com>

On Mar 18, 7:13?pm, Weeble <clockworksa... at gmail.com> wrote:
> I am loading a dictionary from a text file and constructing a trie
> data structure in memory. However, it takes longer than I'm happy with
> - about 12 seconds on my computer. I profiled it, came up with some
> clever ideas to cut down on the work (such as by exploiting the fact
> that the dictionary is sorted) and was only able to shave a small
> fraction of the time off. However, then I tried calling gc.disable()
> before loading the trie and it halved the running time! I was
> surprised. Is that normal? I thought that the cost of garbage
> collection would be in some way proportional to the amount of garbage
> created, but I didn't think I was creating any: as far as I can tell
> the only objects deallocated during the load are strings, which could
> not be participating in cycles.

Well, you are creating and destroying a lot of objects in the process,
so that will provoke the garbage collector.  But you are also doing
reversing and searching, and that's slow.  Does your application
really need to be able to keep things in order like this, or do you
just want to know if a word is in the dictionary?  If you just want to
load up a dictionary and be able to see if words are in it, I would
use a dict instead of a list.
Even if you want to be able to print out the data in order, you might
consider using a dict instead of a list.  The print operation could
use one sort at the end, instead of searching all the nodes on
insertion.

You could also use a character that doesn't appear in your data as a
sentinel, and then you don't need a separate active indicator -- every
leaf node will be empty and be referred to by the sentinel character.

You are also doing a lot of recursive operations that could be done
without recursing.

Finally, do you really need to keep an additional object around for
each node in the tree?

I have modified your trie code to use a dict and a sentinel, while
keeping basically the same API.  This may or may not be the best way
to do this, depending on your other code which uses this data
structure.  It could also probably be made faster by removing the
setdefault, and not re-building objects when you need them, and even
this implementation will load faster if you disable the gc, but in any
case, this might give you some ideas about how to make your code go
faster.

Regards,
Pat


from collections import defaultdict

class TrieTop(object):
    sentinel = ' '  # Something not in the data

    def __init__(self, data=None):
        def defaultrecurse():
            return defaultdict(defaultrecurse)
        if data is None:
            data = defaultrecurse()
        self.data = data
    def insert(self, word):
        data = self.data
        for ch in word:
            data = data[ch]
        data[self.sentinel]
    def seek(self, word):
        data = self.data
        for ch in word:
            data = data.get(ch)
            if data is None:
                return EMPTY_TRIE
        return TrieTop(data)
    def load(self, file):
        for line in file:
            self.insert(line.strip().lower())
    def empty(self):
        return (not self.data)
    def endings(self, prefix=""):
        def recurse(data, prefix):
            if not data:
                yield prefix[:-1]
                return
            for ch, data in data.iteritems():
                for result in recurse(data, prefix + ch):
                    yield result
        return sorted(recurse(self.data, prefix))

EMPTY_TRIE = TrieTop()


From anand.ibmgsi at gmail.com  Fri Mar 19 02:03:21 2010
From: anand.ibmgsi at gmail.com (anand jeyahar)
Date: Fri, 19 Mar 2010 11:33:21 +0530
Subject: Bug in Python APscheduler module.
Message-ID: <1a3a139e1003182303j218f3dc8x32896e2fe2119c5f@mail.gmail.com>

Hi ,
       I looked everywhere and could find no mention of this(might be
looking in the wrong places point me please..).  the Python package Advanced
python scheduler seems to have  a bug with the unschedule func. When
passing the  function of an object it doesn't remove it from the scheduler.
but works fine with a normal function. Please find my test script attached
and guide me...


from apscheduler.scheduler import Scheduler
def test_func():
    print "test func"

class test_class():
    def test_class1(self):
        print "test class"

def main():
    sched=Scheduler()
    sched.start()
    tc=test_class()
    tc.test_class1()
    print sched.add_interval_job(test_func,minutes=1)
    print sched.add_interval_job(tc.test_class1,minutes=1)
    print sched.add_interval_job(test_func,seconds=20)
    print "jobs b4 unschedule"
    print sched.jobs
#    sched.unschedule_func(test_func)
    sched.unschedule_func(tc.test_class1)
    print "jobs after unschedule"
    print sched.jobs
    sched.shutdown()


if __name__=='__main__':
    main()
~

~

~

~
==============================================
Anand J
http://sites.google.com/a/cbcs.ac.in/students/anand
==============================================
The man who is really serious,
with the urge to find out what truth is,
has no style at all. He lives only in what is.
                 ~Bruce Lee

Love is a trade with lousy accounting policies.
                ~Aang Jie
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From tjreedy at udel.edu  Fri Mar 19 02:51:20 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 19 Mar 2010 02:51:20 -0400
Subject: Bug in Python APscheduler module.
In-Reply-To: <1a3a139e1003182303j218f3dc8x32896e2fe2119c5f@mail.gmail.com>
References: <1a3a139e1003182303j218f3dc8x32896e2fe2119c5f@mail.gmail.com>
Message-ID: <hnv6t9$j69$1@dough.gmane.org>

On 3/19/2010 2:03 AM, anand jeyahar wrote:
> Hi ,
>         I looked everywhere and could find no mention of this(might be
> looking in the wrong places point me please..).  the Python package
> Advanced python scheduler seems to have  a bug with the unschedule func.

The site for that package
http://apscheduler.nextday.fi/
has links for Getting Help and Reporting Bugs.



From alfps at start.no  Fri Mar 19 03:01:46 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Fri, 19 Mar 2010 08:01:46 +0100
Subject: Python bindings tutorial
In-Reply-To: <iau5q5tm3dkligk85l9upii0dm14frfvrb@4ax.com>
References: <31a7ecc9-067d-44ce-8af9-adcc30bb3cfd@o30g2000yqb.googlegroups.com>	<mailman.863.1268766752.23598.python-list@python.org>	<98447f7e-64db-4a10-b19e-685f5b079cf6@l25g2000yqd.googlegroups.com>
	<hnq7qt$kl0$1@dough.gmane.org>
	<mailman.898.1268824466.23598.python-list@python.org>
	<iau5q5tm3dkligk85l9upii0dm14frfvrb@4ax.com>
Message-ID: <hnv7gs$7qc$1@news.eternal-september.org>

* Tim Roberts:
> Dave Angel <davea at ieee.org> wrote:
>> There's no real reason parts of an exe cannot be exported, same as a 
>> dll.  They are in fact the same structure.  And in fact many other files 
>> in the Windows environment are also the same structure, from fonts to ocx's


This is a bit off-topic, but your explanation is incorrect in some key respects, 
so (no offense) to avoid readers getting an incorrect impression:


> Well, there IS a fundamental difference.  EXEs and DLLs and the like do all
> have the same format.  They all have a "transfer address"

Commonly called an "entry point".

This is the term you need to know about when e.g. linking object files.



>, where execution
> begins.  That's the key problem.  With a DLL, the transfer address goes to
> a DllMain, where certain DLL initialization is done, preparing the other
> entry points for use.

Right, modulo terminology: there's only one "entry point" in a PE format file.


>  With an EXE, the transfer address goes to "main".

Sorry, no, the EXE entry point goes to a routine of no arguments.

Typically, in C and C++ that's a run time library routine (e.g. with Microsoft's 
run time library mainCRTStartup or one of its cousins) which in turn calls the 
C/C++ "main", while in Pascal it runs the main program, so on.

Note that the EXE entry point is probably still incorrectly documented as 
requiring WinMain signature  --  it's the most infamous Microsoft documentation 
screw-up.


> So, when you load an EXE as a DLL, you will be RUNNING the program.

Sorry, no, that's not what happens.

The Windows API LoadLibrary(Ex) knows the difference between an EXE and a DLL.

It's documented as handling both sub-formats, and it does.


>  That's is usually not what you want.

If that had happened then it would be a problem, yes. Happily it doesn't happen. 
I've discussed the real problems else-thread.


Cheers & hth.,

- Alf


From daniele.esposti at gmail.com  Fri Mar 19 03:20:32 2010
From: daniele.esposti at gmail.com (Expo)
Date: Fri, 19 Mar 2010 00:20:32 -0700 (PDT)
Subject: sqlite3, memory db and multithreading
References: <hnt81m$fsi$1@news.task.gda.pl>
Message-ID: <155a70fb-0e4e-43a8-8e4c-0f4475573035@t20g2000yqe.googlegroups.com>

On Mar 18, 1:58?pm, kr?lewna <kr le... at ee.pl> wrote:
> The problem is simple: I have multiple threads within one program. At
> least 2 threads have to have access to in-memory sqlite database. It is
> not possible to pass sqlite objects to those threads because an
> exception is rised:
>
> ProgrammingError: SQLite objects created in a thread can only be used in
> that same thread.The object was created in thread id -1219066176 and
> this is thread id -1224475792
>
> Is there any EASY way to use this in-memory db in many threads? Creating
> another connection is not a solution as it creates completely new db
> instead of connecting to the existing one.
>

You can put the SQLite database into a Singleton class and use a
semaphore to serialize the access to methods which writes to the
database.


From dr.cg at 126.com  Fri Mar 19 03:49:28 2010
From: dr.cg at 126.com (CHEN Guang)
Date: Fri, 19 Mar 2010 15:49:28 +0800 (CST)
Subject: C++ code generation
In-Reply-To: <7f014ea61003180928q4763a819ic548364e2811952d@mail.gmail.com>
References: <7f014ea61003180928q4763a819ic548364e2811952d@mail.gmail.com>
	<24b7e9.8952.1276b803126.Coremail.dr.cg@126.com>
Message-ID: <90858a.6e02.1277565f46c.Coremail.dr.cg@126.com>

Plug? Any evidence to say that? As long as this thread concerned, is there any answer more closed to the topic "C++ code generation" than mine? 

I think Stefan was telling you, in a nice way, to stop spamming every thread about code generation with a plug for your project. 


2010/3/17 CHEN Guang <dr.cg at 126.com>

>> ----- Original Message -----
>> From: "Dan Goodman"<dg.gmane at thesamovar.net>
>>
>>> I'm doing some C++ code generation using Python, and would be interested
>>> in any comments on the approach I'm taking.
>>
>> PythoidC ( http://pythoidc.googlecode.com ) is a C code generator (not C++)
> 
> It would be nice if you could start reading the posts before you answer, 
> and then try to give an answer that fits the question.
> 
> Stefan
 
I have read the post, may be I lost some words and made you misunderstand. I meant:
PythoidC ( http://pythoidc.googlecode.com ) is a C code generator (but not C++), if you find it useful, 
welcome to take a look.



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From __peter__ at web.de  Fri Mar 19 03:56:46 2010
From: __peter__ at web.de (Peter Otten)
Date: Fri, 19 Mar 2010 08:56:46 +0100
Subject: logging: local functions ==> loss of lineno
References: <mailman.576.1268256192.23598.python-list@python.org>
	<hnaj9c$i0u$02$1@news.t-online.com>
	<mailman.959.1268946325.23598.python-list@python.org>
Message-ID: <hnvanq$goh$03$1@news.t-online.com>

Hellmut Weber wrote:

> your hack is exactly what I was looking for.
> It permits to configure my logging messages as I want, e.g. using
> different colors for different classes of messages.
> 
> I do not yet understand all details WHY it is working but suppose some
> study of the logging module will help me to understand.

Have  a look at Logger.findCaller() in logging/__init__.py. To find the 
calling function it does something like

for frame in walk_callstack():
    if filename_of(frame) == _srcfile:
        continue
    return filename_lineno_and_functionname_of(frame)

The _srcfile is normally logging/__init__.py, and it is skipped because a 
user typically is interested only in what happens outside the logging 
package.

My hack under the hood changes

filename_of(frame) == _srcfile

from a string comparison to a

filename_of(frame) in set_of_files

containment test (see SrcFile.__eq__() posted above).

Peter





From nbvfour at gmail.com  Fri Mar 19 04:05:03 2010
From: nbvfour at gmail.com (nbv4)
Date: Fri, 19 Mar 2010 01:05:03 -0700 (PDT)
Subject: installing something to a virtualenv when it's already in 
	site-packages
Message-ID: <f72d8080-6fda-4b4b-b4a6-df6f354479fc@19g2000yqu.googlegroups.com>

I have ipython installed via apt. I can go to the command line and
type 'ipython' and it will work. If I try to install ipython to a
virtualenv, I get this:

$ pip install -E env/ ipython
Requirement already satisfied: ipython in /usr/share/pyshared
Installing collected packages: ipython
Successfully installed ipython

I want ipython in both site-packages as well as in my virtualenv. This
is bad because when I activate the virtualenv, site-packages
disappears and ipython is not available. A work around is to uninstall
ipython from apt, install to the virtualenv, then reinstall in apt. Is
there a better way?


From darkrho at gmail.com  Fri Mar 19 04:26:56 2010
From: darkrho at gmail.com (Rolando Espinoza La Fuente)
Date: Fri, 19 Mar 2010 04:26:56 -0400
Subject: installing something to a virtualenv when it's already in 
	site-packages
In-Reply-To: <f72d8080-6fda-4b4b-b4a6-df6f354479fc@19g2000yqu.googlegroups.com>
References: <f72d8080-6fda-4b4b-b4a6-df6f354479fc@19g2000yqu.googlegroups.com>
Message-ID: <4eca3f41003190126mc625306m59608d638253d91c@mail.gmail.com>

On Fri, Mar 19, 2010 at 4:05 AM, nbv4 <nbvfour at gmail.com> wrote:
> I have ipython installed via apt. I can go to the command line and
> type 'ipython' and it will work. If I try to install ipython to a
> virtualenv, I get this:
>
> $ pip install -E env/ ipython
> Requirement already satisfied: ipython in /usr/share/pyshared
> Installing collected packages: ipython
> Successfully installed ipython
>
> I want ipython in both site-packages as well as in my virtualenv. This
> is bad because when I activate the virtualenv, site-packages
> disappears and ipython is not available. A work around is to uninstall
> ipython from apt, install to the virtualenv, then reinstall in apt. Is
> there a better way?

I use -U (--upgrade) to force the installation within virtualenv. e.g:

$ pip install -E env/ -U ipython

Regards,

Rolando


From pankaj.kr at gmail.com  Fri Mar 19 05:03:54 2010
From: pankaj.kr at gmail.com (Pankaj)
Date: Fri, 19 Mar 2010 02:03:54 -0700 (PDT)
Subject: exp_continue
Message-ID: <1669b997-c4bf-43fc-a2e0-3d5c99cb0524@v34g2000prm.googlegroups.com>

I am using pexpect module in python

I would like to know how I can use exp_continue here.

what is the alternative of exp_continue of perl/tcl in pexpect.


From nilly16 at yahoo.com  Fri Mar 19 05:37:35 2010
From: nilly16 at yahoo.com (Jimbo)
Date: Fri, 19 Mar 2010 02:37:35 -0700 (PDT)
Subject: Why this compile error?
Message-ID: <c5dfb9b1-1dec-4fb0-9058-5043ade52d8c@u19g2000prh.googlegroups.com>

Hello

Can you help me figure out why I am getting this compile error with my
program. The error occurs right at the bottom of my code & I have
commented where it occurs.

The error is:
[QUOTE]Expected an indented block[/QUOTE]

[CODE]"""
 *Stock Data Builder*
   Algorithm:
      - Search website for stock
      - Get website HTML source code
      - Search code for target stock data(price,dividends)
      - Add data to text file
"""

import sys

# Functions
def getSource(URL, sourceBuffer):
    """ Retrieve HTML source code from websitr URL &
        save in sourceBuffer                       """

    return sourceBuffer

def getData(targetData, dataBuffer):
    """ Searches the string dataBuffer for the occurence of target
        data & returns that whole line                            """

def writeToFile(textFile, dataBuffer):
    """ Writes data in string dataBuffer to text file """

    # CHANGE this to try except to catch errors
    fileT = open(textFile,'a')
    fileT.write(dataBuffer)
    return True; # function succeeded

def writeToFile(textFile, dataList):
    """ Writes data in List dataList to text file """

    # CHANGE this to try except to catch errors
    fileT = open(textFile,'a')

    for element in dataList:
        fileT.write(element)
    return True; # function succeeded



# Main program loop
def main():
    programEnd = False;

    while (programEnd == False):
        #ERROR HERE?? - Error="Expected an indented block"
main()[/CODE]


From bruno.42.desthuilliers at websiteburo.invalid  Fri Mar 19 06:04:11 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Fri, 19 Mar 2010 11:04:11 +0100
Subject: Why this compile error?
In-Reply-To: <c5dfb9b1-1dec-4fb0-9058-5043ade52d8c@u19g2000prh.googlegroups.com>
References: <c5dfb9b1-1dec-4fb0-9058-5043ade52d8c@u19g2000prh.googlegroups.com>
Message-ID: <4ba34c10$0$29759$426a74cc@news.free.fr>

Jimbo a ?crit :
> Hello
> 
> Can you help me figure out why I am getting this compile error with my
> program. The error occurs right at the bottom of my code & I have
> commented where it occurs.
> 
> The error is:
> [QUOTE]Expected an indented block[/QUOTE]
> 
> [CODE]
(snip)
> # Main program loop
> def main():
>     programEnd = False;
> 
>     while (programEnd == False):
>         #ERROR HERE?? - Error="Expected an indented block"

Indeed. You *need* a stamement in the while block. If you want a noop, 
then use the 'pass' statement:

      while programEnd == False:
          pass


But note that as-is, this will go into an infinite loop.


From eckhardt at satorlaser.com  Fri Mar 19 06:11:18 2010
From: eckhardt at satorlaser.com (Ulrich Eckhardt)
Date: Fri, 19 Mar 2010 11:11:18 +0100
Subject: Why this compile error?
References: <c5dfb9b1-1dec-4fb0-9058-5043ade52d8c@u19g2000prh.googlegroups.com>
Message-ID: <67vb77-sb6.ln1@satorlaser.homedns.org>

Jimbo wrote:
> Can you help me figure out why I am getting this compile error with my
> program. The error occurs right at the bottom of my code & I have
> commented where it occurs.
[...]
> def main():
>     programEnd = False;
> 
>     while (programEnd == False):
>         #ERROR HERE?? - Error="Expected an indented block"
> main()[/CODE]

Was the comment there before or not? In any case, I believe a comment
doesn't qualify as indented block, if you want to leave the block empty
use 'pass' instead. Also, make sure you don't mix tabs and spaces, which is
also a popular way to confuse Python.

BTW: "while" doesn't need brackets, that's a C-ism. ;)

Cheers!

Uli

-- 
Sator Laser GmbH
Gesch?ftsf?hrer: Thorsten F?cking, Amtsgericht Hamburg HR B62 932



From jeanmichel at sequans.com  Fri Mar 19 06:39:57 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 19 Mar 2010 11:39:57 +0100
Subject: logging: local functions ==> loss of lineno
In-Reply-To: <4BA295A1.70207@hellmutweber.de>
References: <mailman.576.1268256192.23598.python-list@python.org>	<hnaj9c$i0u$02$1@news.t-online.com>
	<4BA295A1.70207@hellmutweber.de>
Message-ID: <4BA3547D.7080107@sequans.com>

Hellmut Weber wrote:
> Am 11.03.2010 12:14, schrieb Peter Otten:
>> Hellmut Weber wrote:
>>
>>> Logging works very well giving the filename and line number of the 
>>> point
>>> where it is called. As long as I use the loggers directly.
>>> BUT when I have to wrap the logger call in some other function, I 
>>> always
>>> get file name and line number of the call of the logger inside the
>>> wrapping function.
>>>
>>> Is there a possibility to get this information in this situation too?
>>
>> The official way is probably to write a custom Logger class that 
>> overrides
>> the findCaller() method.
>>
>> Below is a hack that monkey-patches the logging._srcfile attribute to 
>> ignore
>> user-specified modules in the call stack:
>>
>> $ cat wrapper.py
>> import logging
>> import os
>> import sys
>>
>> logger = logging.getLogger()
>>
>> class SrcFile(object):
>>      def __init__(self, exclude_files):
>>          self.files = set(exclude_files)
>>      def __eq__(self, other):
>>          return other in self.files
>>
>> def fixname(filename):
>>      if filename.lower().endswith((".pyc", ".pyo")):
>>          filename = filename[:-4] + ".py"
>>      return os.path.normcase(filename)
>>
>> if "--monkey" in sys.argv:
>>      print "patching"
>>      logging._srcfile = SrcFile([logging._srcfile, fixname(__file__)])
>>
>> def warn(*args, **kw):
>>      logger.warn(*args, **kw)
>>
>> $ cat main.py
>> import logging
>> logging.basicConfig(format="%(filename)s<%(lineno)s>: %(message)s")
>> import wrapper
>> wrapper.warn("foo")
>> wrapper.warn("bar")
>> wrapper.warn("baz")
>>
>> $ python main.py
>> wrapper.py<23>: foo
>> wrapper.py<23>: bar
>> wrapper.py<23>: baz
>>
>> $ python main.py --monkey
>> patching
>> main.py<4>: foo
>> main.py<5>: bar
>> main.py<6>: baz
>>
>> $ python -V
>> Python 2.6.4
>>
>> Peter
>
> Hi Peter,
> your hack is exactly what I was looking for.
> It permits to configure my logging messages as I want, e.g. using 
> different colors for different classes of messages.
>
> I do not yet understand all details WHY it is working but suppose some 
> study of the logging module will help me to understand.
>
> Thank you very much
>
_scrFile is a private attribute of the logging module. Don't change it.

As you said yourself, 'The official way is probably to write a custom 
Logger class that overrides
the findCaller() method'

JM



From peter_peyman_puk at yahoo.ca  Fri Mar 19 06:47:53 2010
From: peter_peyman_puk at yahoo.ca (Peyman Askari)
Date: Fri, 19 Mar 2010 03:47:53 -0700 (PDT)
Subject: Importing modules
Message-ID: <180153.53663.qm@web43402.mail.sp1.yahoo.com>

I want to write a function which imports modules the first time, and reloads them afterwards, but I am running into problems with global variables and exec. I will include a full script, but let me elaborate first.

Essentially what you need is

def import_or_reload():
?"""assume we want to load or reload sys"""
?if 'sys' in dir():
? reload(sys)
else: 
? import sys

but this runs into the problem that sys is imported within the local scope of the function, so you insert a global statement



def import_or_reload2():

?"""Add 'global sys'"""
?global sys

?if 'sys' in dir():

? reload(sys)

else: 

? import sys

'sys' is still not in dir() as dir() pertains to the local scope of the function, but one can get around this by creating a local modules list and adding the imported modules to it





def import_or_reload3():


?"""Add 'global modules'"""

?global sys
?global modules



?if 'sys' in modules:


? reload(sys)


else: 


? import sys
? modules.append('sys')

now lets add a parameter to the function signature, so any module name can be passed as an argument and loaded





def import_or_reload4(module_name):



?"""Add exec"""
?

exec 'global %s'%module_name

?global modules





?if module_name in modules:



? exec 'reload(%s)'%module_name



else: 



? exec 'import %s'%module_name

? exec 'modules.append(\'%s\')'%module_name

but this doesn't work as global does not cooperate with exec
is there a __reload__('X') function like there is an __import__(?X?) function? 

Also is there a better way to import modules at run time?

Cheers and here is the test script in case you can't access the attachment

def a():
??? global modules
??? global sys
??? import sys

??? modules.append('sys')

def b():
??? global modules
??? global sys

??? reload(sys)

def c(module_name):
??? global modules
??? exec 'global %s'%module_name
??? exec 'import %s'%module_name

??? modules.append(module_name)

def test():
??? global modules
??? global sys

??? #create the module list to contain all the modules
??? modules=[]

??? print 'originally dir() returns:'
??? print dir()

??? a()
??? print 'function a() properly imports the following module:'
??? print sys
??? print 'is %s in %s->%s'%('sys',modules,'sys' in modules)
??? 
??? b()
??? print 'function b() properly reloads the following module:'
??? print sys
??? print 'is %s still in %s->%s'%('sys',modules,'sys' in modules)

??? try:
??? ??? c('os')
??? ??? print 'function c() properly imports the following module:'
??? except:
??? ??? print 'function c() failed to import module os'
??? ??? print 'is %s in %s->%s'%('os',modules,'os' in modules)

??? try:
??? ??? print os
??? ??? print 'is %s still in %s->%s'%('os',modules,'os' in modules)
??? except:
??? ??? print 'os was loaded, but is not visible outside of the scope of c()'
--- On Fri, 3/19/10, python-list-request at python.org <python-list-request at python.org> wrote:

From: python-list-request at python.org <python-list-request at python.org>
Subject: Python-list Digest, Vol 78, Issue 192
To: python-list at python.org
Received: Friday, March 19, 2010, 7:05 AM

Send Python-list mailing list submissions to
??? python-list at python.org

To subscribe or unsubscribe via the World Wide Web, visit
??? http://mail.python.org/mailman/listinfo/python-list
or, via email, send a message with subject or body 'help' to
??? python-list-request at python.org

You can reach the person managing the list at
??? python-list-owner at python.org

When replying, please edit your Subject line so it is more specific
than "Re: Contents of Python-list digest..."
Today's Topics:

???1. Re: import antigravity (John Bokma)
???2. Re: Truoble With A Search Script for ImageBin.org
? ? ? (Cameron Simpson)
???3. example of ssl with SimpleXMLRPCServer in 2.6? (Rowland Smith)
???4. Re: multiprocessing on freebsd (Tim Arnold)
???5. Re: Python bindings tutorial (Tim Roberts)
???6. Re: sqlite3, memory db and multithreading (John Nagle)
???7. Re: GC is very expensive: am I doing something wrong?
? ? ? (Patrick Maupin)
???8. Bug in Python APscheduler module. (anand jeyahar)
???9. Re: Bug in Python APscheduler module. (Terry Reedy)
? 10. Re: Python bindings tutorial (Alf P. Steinbach)
-- 
http://mail.python.org/mailman/listinfo/python-list


      __________________________________________________________________
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From królewna at ee.pl  Fri Mar 19 06:55:57 2010
From: królewna at ee.pl (=?ISO-8859-1?Q?kr=F3lewna?=)
Date: Fri, 19 Mar 2010 11:55:57 +0100
Subject: sqlite3, memory db and multithreading
In-Reply-To: <57dc1ce8-1ac7-4d72-aafc-6fe7920144c2@c16g2000yqd.googlegroups.com>
References: <hnt81m$fsi$1@news.task.gda.pl>
	<57dc1ce8-1ac7-4d72-aafc-6fe7920144c2@c16g2000yqd.googlegroups.com>
Message-ID: <hnvl7s$lsv$1@news.task.gda.pl>

W dniu 18.03.2010 15:49, DreiJane pisze:

> Principally sqlite connections (sqlite3 objects in the C-API) can be
> used over multiple threads - and connections to :memory: make no
> difference. There are additional parameters to open() giving fine-
> tuned control. And apsw is promising a true reflection of sqlite's C-
> API.

It's my fault not saying what am I using to connect to sqlite db. It's 
sqlite3 module. So there is no open() function etc. As for now I'm not 
interested in rewriting my program to use apsw so is there any possible 
way of working this out with sqlite3?

--
best regards
princess



From królewna at ee.pl  Fri Mar 19 06:56:54 2010
From: królewna at ee.pl (=?UTF-8?B?a3LDs2xld25h?=)
Date: Fri, 19 Mar 2010 11:56:54 +0100
Subject: sqlite3, memory db and multithreading
In-Reply-To: <hnu848$oo7$1@panix5.panix.com>
References: <hnt81m$fsi$1@news.task.gda.pl> <hnu848$oo7$1@panix5.panix.com>
Message-ID: <hnvl9l$lsv$2@news.task.gda.pl>

W dniu 18.03.2010 23:06, Aahz pisze:
>
> You probably need to serialize access to the database through one thread.

sqlite3 objects are not pickable so it's not proper way.

--
best regards
princess



From królewna at ee.pl  Fri Mar 19 07:04:16 2010
From: królewna at ee.pl (=?ISO-8859-1?Q?kr=F3lewna?=)
Date: Fri, 19 Mar 2010 12:04:16 +0100
Subject: sqlite3, memory db and multithreading
In-Reply-To: <155a70fb-0e4e-43a8-8e4c-0f4475573035@t20g2000yqe.googlegroups.com>
References: <hnt81m$fsi$1@news.task.gda.pl>
	<155a70fb-0e4e-43a8-8e4c-0f4475573035@t20g2000yqe.googlegroups.com>
Message-ID: <hnvlne$njq$1@news.task.gda.pl>

W dniu 19.03.2010 08:20, Expo pisze:
>
> You can put the SQLite database into a Singleton class and use a
> semaphore to serialize the access to methods which writes to the
> database.

I've tried this out but doesnt work. Still gives an error like:

ProgrammingError: SQLite objects created in a thread can only be used in 
that same thread.The object was created in thread id -1216280896 and 
this is thread id -1217107088

--
best regards
princess



From mail at timgolden.me.uk  Fri Mar 19 07:10:29 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Fri, 19 Mar 2010 11:10:29 +0000
Subject: sqlite3, memory db and multithreading
In-Reply-To: <hnvl9l$lsv$2@news.task.gda.pl>
References: <hnt81m$fsi$1@news.task.gda.pl> <hnu848$oo7$1@panix5.panix.com>
	<hnvl9l$lsv$2@news.task.gda.pl>
Message-ID: <4BA35BA5.5020805@timgolden.me.uk>

On 19/03/2010 10:56, kr?lewna wrote:
> W dniu 18.03.2010 23:06, Aahz pisze:
>>
>> You probably need to serialize access to the database through one thread.
>
> sqlite3 objects are not pickable so it's not proper way.

Is it possible you've misunderstood the meaning of the word "serialize"
here? What's being suggested isn't serialising (ie marshalling, pickling)
the data; rather, serialising the *access*, ie pushing all db requests into
a queue which is read by one thread which manages the only db connection.

TJG


From królewna at ee.pl  Fri Mar 19 07:24:11 2010
From: królewna at ee.pl (=?ISO-8859-1?Q?kr=F3lewna?=)
Date: Fri, 19 Mar 2010 12:24:11 +0100
Subject: sqlite3, memory db and multithreading
In-Reply-To: <mailman.974.1268997041.23598.python-list@python.org>
References: <hnt81m$fsi$1@news.task.gda.pl>
	<hnu848$oo7$1@panix5.panix.com>	<hnvl9l$lsv$2@news.task.gda.pl>
	<mailman.974.1268997041.23598.python-list@python.org>
Message-ID: <hnvmsp$rln$1@news.task.gda.pl>

W dniu 19.03.2010 12:10, Tim Golden pisze:
> Is it possible you've misunderstood the meaning of the word "serialize"
> here?
It's not possible, it just happened :)

> What's being suggested isn't serialising (ie marshalling, pickling)
> the data; rather, serialising the *access*, ie pushing all db requests into
> a queue which is read by one thread which manages the only db connection.

That would make structure of program much more complicated. I would have 
to create queue for putting there queries and some other extra 
variables/structure to receive output from db and some more for 
controlling the execution flow of awaiting threads.
--
best regards
princess



From kamil at lucem.pl  Fri Mar 19 07:48:17 2010
From: kamil at lucem.pl (Kamil Wasilewski)
Date: Fri, 19 Mar 2010 12:48:17 +0100
Subject: python-daemon PID file
Message-ID: <eeca458e1003190448p6f7d1900p47dbc0ecf0e9f588@mail.gmail.com>

Hi all,

Im trying to get a daemon up and running but have been tripping on every
stone along the way, this last one however i cant manage to get by.
versions:
Python 2.5.2
python-daemon-1.5.5
Debian Linux 2.6.26-2-686

Some of the problems ive run into:

import daemon
with daemon.DaemonContext():
    do_main_program()

doesnt work on my version of Python 2.5.2 so im using

import daemon
import grp
import pwd

diablo.uid = pwd.getpwnam('nobody').pw_uid
diablo.gid = grp.getgrnam('nogroup').gr_gid

daemon.__enter__()
main()
daemon.__exit__()

Next I had problems with Initd starting the daemon because i forgot to chmod
it to 755.

The final problem is with the PID file and getting a correct PID written.
Initially there was no file being created, so i thought i needed the
--make-pidfile option in start-stop-daemon, but ive since learned that the
daemon should create and edit the file, not s-s-d as it inserts the PID of
the parent process, which is not the correct PID of the final daemon.

So i added to my daemon:

import lockfile
daemon.DaemonContext(pidfile=lockfile.FileLock('/var/run/mydaemon.pid'),)


which didnt start the daemon at all as i created the pid file as root, and
was setting the Daemon to run as nobody,nogroup so it was dieing silently.
Im running it as root for now to see if i can get a correct pid in the pid
file.
However no PID file is created, and if i create one its not populated with a
PID.

In summary: I cant get a PID file created or pupulated with a PID by
python-daemon.
Anyone see something that im doing wrong? ive been sitting on this way too
long. I looked at the python-daemon source and i cant see where the pid is
inserted into the pid file, only where it __enter__'s the lockfile so is
this missing?
Thanks!
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From slais-www at ucl.ac.uk  Fri Mar 19 08:08:19 2010
From: slais-www at ucl.ac.uk (djc)
Date: Fri, 19 Mar 2010 12:08:19 +0000
Subject: should writing Unicode files be so slow
In-Reply-To: <8739zxw057.fsf@benfinney.id.au>
References: <hnu9gl$fg7e$1@uns-a.ucl.ac.uk> <8739zxw057.fsf@benfinney.id.au>
Message-ID: <hnvpfj$7k76$1@uns-a.ucl.ac.uk>

Ben Finney wrote:
> djc <slais-www at ucl.ac.uk> writes:
> 
>> I have a simple program to read a text (.csv) file
> 
> Could you please:
> 
> * simplify it further: make a minimal version that demonstrates the
>   difference you're seeing, without any extraneous stuff that doesn't
>   appear to affect the result.
> 
> * make it complete: the code you've shown doesn't do anything except
>   define some functions.
> 
> In other words: please reduce it to a complete, minimal example that we
> can run to see the same behaviour you're seeing.
> 


It is the minimal example. The only thing omited is the opt.parse code that
 calls _file_to_files(infile, outfile_prefix, column, sep):


-- 
David Clark, MSc, PhD.              UCL Centre for Publishing
                                    Gower Str London WCIE 6BT
What sort of web animal are you?
            <https://www.bbc.co.uk/labuk/experiments/webbehaviour>


From __peter__ at web.de  Fri Mar 19 08:24:41 2010
From: __peter__ at web.de (Peter Otten)
Date: Fri, 19 Mar 2010 13:24:41 +0100
Subject: logging: local functions ==> loss of lineno
References: <mailman.576.1268256192.23598.python-list@python.org>
	<hnaj9c$i0u$02$1@news.t-online.com>
	<4BA295A1.70207@hellmutweber.de>
	<mailman.972.1268995215.23598.python-list@python.org>
Message-ID: <hnvqe5$vc$02$1@news.t-online.com>

Jean-Michel Pichavant wrote:

> Hellmut Weber wrote:
>> Am 11.03.2010 12:14, schrieb Peter Otten:
>>> Hellmut Weber wrote:
>>>
>>>> Logging works very well giving the filename and line number of the
>>>> point
>>>> where it is called. As long as I use the loggers directly.
>>>> BUT when I have to wrap the logger call in some other function, I
>>>> always
>>>> get file name and line number of the call of the logger inside the
>>>> wrapping function.
>>>>
>>>> Is there a possibility to get this information in this situation too?
>>>
>>> The official way is probably to write a custom Logger class that
>>> overrides
>>> the findCaller() method.
>>>
>>> Below is a hack that monkey-patches the logging._srcfile attribute to
>>> ignore
>>> user-specified modules in the call stack:
>>>
>>> $ cat wrapper.py
>>> import logging
>>> import os
>>> import sys
>>>
>>> logger = logging.getLogger()
>>>
>>> class SrcFile(object):
>>>      def __init__(self, exclude_files):
>>>          self.files = set(exclude_files)
>>>      def __eq__(self, other):
>>>          return other in self.files
>>>
>>> def fixname(filename):
>>>      if filename.lower().endswith((".pyc", ".pyo")):
>>>          filename = filename[:-4] + ".py"
>>>      return os.path.normcase(filename)
>>>
>>> if "--monkey" in sys.argv:
>>>      print "patching"
>>>      logging._srcfile = SrcFile([logging._srcfile, fixname(__file__)])
>>>
>>> def warn(*args, **kw):
>>>      logger.warn(*args, **kw)
>>>
>>> $ cat main.py
>>> import logging
>>> logging.basicConfig(format="%(filename)s<%(lineno)s>: %(message)s")
>>> import wrapper
>>> wrapper.warn("foo")
>>> wrapper.warn("bar")
>>> wrapper.warn("baz")
>>>
>>> $ python main.py
>>> wrapper.py<23>: foo
>>> wrapper.py<23>: bar
>>> wrapper.py<23>: baz
>>>
>>> $ python main.py --monkey
>>> patching
>>> main.py<4>: foo
>>> main.py<5>: bar
>>> main.py<6>: baz
>>>
>>> $ python -V
>>> Python 2.6.4
>>>
>>> Peter
>>
>> Hi Peter,
>> your hack is exactly what I was looking for.
>> It permits to configure my logging messages as I want, e.g. using
>> different colors for different classes of messages.
>>
>> I do not yet understand all details WHY it is working but suppose some
>> study of the logging module will help me to understand.
>>
>> Thank you very much
>>
> _scrFile is a private attribute of the logging module. Don't change it.
> 
> As you said yourself, 'The official way is probably to write a custom
> Logger class that overrides
> the findCaller() method'

OK, I tried the this approach, too:

import logging
import os
import sys

from logging import currentframe

def fixname(filename):
    if filename.lower().endswith((".pyc", ".pyo")):
        filename = filename[:-4] + ".py"
    return os.path.normcase(filename)

class MyLogger(logging.Logger):
    exclude_files = set([logging._srcfile, fixname(__file__)])

    def findCaller(self):
        """
        Find the stack frame of the caller so that we can note the source
        file name, line number and function name.
        """
        f = currentframe()
        #On some versions of IronPython, currentframe() returns None if
        #IronPython isn't run with -X:Frames.
        if f is not None:
            f = f.f_back
        rv = "(unknown file)", 0, "(unknown function)"
        while hasattr(f, "f_code"):
            co = f.f_code
            filename = os.path.normcase(co.co_filename)
            if filename in self.exclude_files:
                f = f.f_back
                continue
            rv = (filename, f.f_lineno, co.co_name)
            break
        return rv

if "--custom-logger" in sys.argv:
    print "setting custom logger"
    logging.setLoggerClass(MyLogger)
    logging.root = MyLogger("root", logging.WARNING)

logger = logging.getLogger()
def warn(*args, **kw):
    logger.warn(*args, **kw)

I had to duplicate the original findCaller() method with only one line 
changed. This means I have now some code duplication and I still have to 
monitor future changes in the logging source.

In this case the "official way" seems to be more intrusive than the "hack".

Peter


From davea at ieee.org  Fri Mar 19 08:25:15 2010
From: davea at ieee.org (Dave Angel)
Date: Fri, 19 Mar 2010 07:25:15 -0500
Subject: Importing modules
In-Reply-To: <180153.53663.qm@web43402.mail.sp1.yahoo.com>
References: <180153.53663.qm@web43402.mail.sp1.yahoo.com>
Message-ID: <4BA36D2B.2000507@ieee.org>



Peyman Askari wrote:
> I want to write a function which imports modules the first time, and reloads them afterwards, but I am running into problems with global variables and exec. I will include a full script, but let me elaborate first.
>
> Essentially what you need is
>
> def import_or_reload():
>  """assume we want to load or reload sys"""
>  if 'sys' in dir():
>   reload(sys)
> else: 
>   import sys
>
> but this runs into the problem that sys is imported within the local scope of the function, so you insert a global statement
>
>
>
> def import_or_reload2():
>
>  """Add 'global sys'"""
>  global sys
>
>  if 'sys' in dir():
>
>   reload(sys)
>
> else: 
>
>   import sys
>
> 'sys' is still not in dir() as dir() pertains to the local scope of the function, but one can get around this by creating a local modules list and adding the imported modules to it
>
>
>
>
>
> def import_or_reload3():
>
>
>  """Add 'global modules'"""
>
>  global sys
>  global modules
>
>
>
>  if 'sys' in modules:
>
>
>   reload(sys)
>
>
> else: 
>
>
>   import sys
>   modules.append('sys')
>
> now lets add a parameter to the function signature, so any module name can be passed as an argument and loaded
>
>
>
>
>
> def import_or_reload4(module_name):
>
>
>
>  """Add exec"""
>  
>
> exec 'global %s'%module_name
>
>  global modules
>
>
>
>
>
>  if module_name in modules:
>
>
>
>   exec 'reload(%s)'%module_name
>
>
>
> else: 
>
>
>
>   exec 'import %s'%module_name
>
>   exec 'modules.append(\'%s\')'%module_name
>
> but this doesn't work as global does not cooperate with exec
> is there a __reload__('X') function like there is an __import__(?X?) function? 
>
> Also is there a better way to import modules at run time?
>
> Cheers and here is the test script in case you can't access the attachment
>
> def a():
>     global modules
>     global sys
>     import sys
>
>     modules.append('sys')
>
> def b():
>     global modules
>     global sys
>
>     reload(sys)
>
> def c(module_name):
>     global modules
>     exec 'global %s'%module_name
>     exec 'import %s'%module_name
>
>     modules.append(module_name)
>
> def test():
>     global modules
>     global sys
>
>     #create the module list to contain all the modules
>     modules=[]
>
>     print 'originally dir() returns:'
>     print dir()
>
>     a()
>     print 'function a() properly imports the following module:'
>     print sys
>     print 'is %s in %s->%s'%('sys',modules,'sys' in modules)
>     
>     b()
>     print 'function b() properly reloads the following module:'
>     print sys
>     print 'is %s still in %s->%s'%('sys',modules,'sys' in modules)
>
>     try:
>         c('os')
>         print 'function c() properly imports the following module:'
>     except:
>         print 'function c() failed to import module os'
>         print 'is %s in %s->%s'%('os',modules,'os' in modules)
>
>     try:
>         print os
>         print 'is %s still in %s->%s'%('os',modules,'os' in modules)
>     except:
>         print 'os was loaded, but is not visible outside of the scope of c()'
> --- On Fri, 3/19/10, python-list-request at python.org <python-list-request at python.org> wrote:
>
> From: python-list-request at python.org <python-list-request at python.org>
> Subject: Python-list Digest, Vol 78, Issue 192
> To: python-list at python.org
> Received: Friday, March 19, 2010, 7:05 AM
>
> <snip>
(When starting a new thread, create a new message addressed to   
python-list at python.org, do not just reply to an existing message, (or 
digest, which you did here).  Some people actually try to follow 
threads, and the software to do that uses more information than just the 
message subject)

First comment.  I would seriously try to avoid using reload() in 
production code.  The problems that can result are subtle.  I use it for 
debugging sessions, but not in real programs.

But I'll assume you have a use case (which would have been good to 
explain), and have rejected the other possibilities.

Next, I'll point out that reloading sys isn't desirable, and it's one of 
the specifically proscribed modules for reloading.  But probably you 
weren't really using sys, you were just sanitizing the code since you 
knew we all had sys.

Next, if your reason for reloading is that you just changed the module 
programmatically, and it might have been loaded by some other module (as 
sys is, for example, long before your code starts), then you're not 
checking in the right place.  Instead of looking at your own global 
space, you should be looking at sys.modules to decide whether something 
has been loaded.

Perhaps the function you're looking for is imp.load_module()

DaveA



From ben+python at benfinney.id.au  Fri Mar 19 08:56:49 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Fri, 19 Mar 2010 23:56:49 +1100
Subject: should writing Unicode files be so slow
References: <hnu9gl$fg7e$1@uns-a.ucl.ac.uk> <8739zxw057.fsf@benfinney.id.au>
	<hnvpfj$7k76$1@uns-a.ucl.ac.uk>
Message-ID: <87ljdov59q.fsf@benfinney.id.au>

djc <slais-www at ucl.ac.uk> writes:

> Ben Finney wrote:
> > Could you please:
> > 
> > * simplify it further: make a minimal version that demonstrates the
> >   difference you're seeing, without any extraneous stuff that doesn't
> >   appear to affect the result.
> > 
> > * make it complete: the code you've shown doesn't do anything except
> >   define some functions.
> > 
> > In other words: please reduce it to a complete, minimal example that we
> > can run to see the same behaviour you're seeing.
>
> It is the minimal example. The only thing omited is the opt.parse code
> that calls _file_to_files(infile, outfile_prefix, column, sep):

What happens, then, when you make a smaller program that deals with only
one file?

What happens when you make a smaller program that only reads the file,
and doesn't write any? Or a different program that only writes a file,
and doesn't read any?

It's these sort of reductions that will help narrow down exactly what
the problem is. Do make sure that each example is also complete (i.e.
can be run as is by someone who uses only that code with no additions).

-- 
 \       ?To have the choice between proprietary software packages, is |
  `\      being able to choose your master. Freedom means not having a |
_o__)                        master.? ?Richard M. Stallman, 2007-05-16 |
Ben Finney


From googler.1.webmaster at spamgourmet.com  Fri Mar 19 09:12:34 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Fri, 19 Mar 2010 06:12:34 -0700 (PDT)
Subject: C-API PyObject_Call
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
	<mailman.849.1268756405.23598.python-list@python.org>
	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>
	<mailman.858.1268759662.23598.python-list@python.org>
	<c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>
	<mailman.883.1268808393.23598.python-list@python.org>
	<3592cca0-2a4a-4a19-9e10-d80936e6d200@upsg2000gro.googlegroups.com>
	<mailman.943.1268899999.23598.python-list@python.org>
	<793e5934-bc1b-4023-aa0e-bf6d956177fd@f8g2000yqn.googlegroups.com>
	<mailman.956.1268930626.23598.python-list@python.org>
Message-ID: <fd5b82be-b56c-4024-ad3b-b1a53698cf1f@r27g2000yqn.googlegroups.com>

In my case I call a funcion and I would like to get the line
where the function returned.

for instance:


def my_function():
    return 3

So I would like to get line 2(in C) somehow.


From jeanmichel at sequans.com  Fri Mar 19 09:49:22 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 19 Mar 2010 14:49:22 +0100
Subject: logging: local functions ==> loss of lineno
In-Reply-To: <hnvqe5$vc$02$1@news.t-online.com>
References: <mailman.576.1268256192.23598.python-list@python.org>	<hnaj9c$i0u$02$1@news.t-online.com>	<4BA295A1.70207@hellmutweber.de>	<mailman.972.1268995215.23598.python-list@python.org>
	<hnvqe5$vc$02$1@news.t-online.com>
Message-ID: <4BA380E2.8060306@sequans.com>

Peter Otten wrote:
> Jean-Michel Pichavant wrote:
>
>   
>> Hellmut Weber wrote:
>>     
>>> Am 11.03.2010 12:14, schrieb Peter Otten:
>>>       
>>>> Hellmut Weber wrote:
>>>>
>>>>         
>>>>> Logging works very well giving the filename and line number of the
>>>>> point
>>>>> where it is called. As long as I use the loggers directly.
>>>>> BUT when I have to wrap the logger call in some other function, I
>>>>> always
>>>>> get file name and line number of the call of the logger inside the
>>>>> wrapping function.
>>>>>
>>>>> Is there a possibility to get this information in this situation too?
>>>>>           
>>>> The official way is probably to write a custom Logger class that
>>>> overrides
>>>> the findCaller() method.
>>>>
>>>> Below is a hack that monkey-patches the logging._srcfile attribute to
>>>> ignore
>>>> user-specified modules in the call stack:
>>>>
>>>> $ cat wrapper.py
>>>> import logging
>>>> import os
>>>> import sys
>>>>
>>>> logger = logging.getLogger()
>>>>
>>>> class SrcFile(object):
>>>>      def __init__(self, exclude_files):
>>>>          self.files = set(exclude_files)
>>>>      def __eq__(self, other):
>>>>          return other in self.files
>>>>
>>>> def fixname(filename):
>>>>      if filename.lower().endswith((".pyc", ".pyo")):
>>>>          filename = filename[:-4] + ".py"
>>>>      return os.path.normcase(filename)
>>>>
>>>> if "--monkey" in sys.argv:
>>>>      print "patching"
>>>>      logging._srcfile = SrcFile([logging._srcfile, fixname(__file__)])
>>>>
>>>> def warn(*args, **kw):
>>>>      logger.warn(*args, **kw)
>>>>
>>>> $ cat main.py
>>>> import logging
>>>> logging.basicConfig(format="%(filename)s<%(lineno)s>: %(message)s")
>>>> import wrapper
>>>> wrapper.warn("foo")
>>>> wrapper.warn("bar")
>>>> wrapper.warn("baz")
>>>>
>>>> $ python main.py
>>>> wrapper.py<23>: foo
>>>> wrapper.py<23>: bar
>>>> wrapper.py<23>: baz
>>>>
>>>> $ python main.py --monkey
>>>> patching
>>>> main.py<4>: foo
>>>> main.py<5>: bar
>>>> main.py<6>: baz
>>>>
>>>> $ python -V
>>>> Python 2.6.4
>>>>
>>>> Peter
>>>>         
>>> Hi Peter,
>>> your hack is exactly what I was looking for.
>>> It permits to configure my logging messages as I want, e.g. using
>>> different colors for different classes of messages.
>>>
>>> I do not yet understand all details WHY it is working but suppose some
>>> study of the logging module will help me to understand.
>>>
>>> Thank you very much
>>>
>>>       
>> _scrFile is a private attribute of the logging module. Don't change it.
>>
>> As you said yourself, 'The official way is probably to write a custom
>> Logger class that overrides
>> the findCaller() method'
>>     
>
> OK, I tried the this approach, too:
>
> import logging
> import os
> import sys
>
> from logging import currentframe
>
> def fixname(filename):
>     if filename.lower().endswith((".pyc", ".pyo")):
>         filename = filename[:-4] + ".py"
>     return os.path.normcase(filename)
>
> class MyLogger(logging.Logger):
>     exclude_files = set([logging._srcfile, fixname(__file__)])
>
>     def findCaller(self):
>         """
>         Find the stack frame of the caller so that we can note the source
>         file name, line number and function name.
>         """
>         f = currentframe()
>         #On some versions of IronPython, currentframe() returns None if
>         #IronPython isn't run with -X:Frames.
>         if f is not None:
>             f = f.f_back
>         rv = "(unknown file)", 0, "(unknown function)"
>         while hasattr(f, "f_code"):
>             co = f.f_code
>             filename = os.path.normcase(co.co_filename)
>             if filename in self.exclude_files:
>                 f = f.f_back
>                 continue
>             rv = (filename, f.f_lineno, co.co_name)
>             break
>         return rv
>
> if "--custom-logger" in sys.argv:
>     print "setting custom logger"
>     logging.setLoggerClass(MyLogger)
>     logging.root = MyLogger("root", logging.WARNING)
>
> logger = logging.getLogger()
> def warn(*args, **kw):
>     logger.warn(*args, **kw)
>
> I had to duplicate the original findCaller() method with only one line 
> changed. This means I have now some code duplication and I still have to 
> monitor future changes in the logging source.
>
> In this case the "official way" seems to be more intrusive than the "hack".
>
> Peter
You are still accessing the private attribute of the  module logging.
My previous remark was misleading, in fact there's nothing you can do 
about it.
_srcfile is not meant to be used elsewhere than in the logging module 
itself.

However, I don't wanna sound like I'm rejecting this solution, 1st the 
OP is satisified with it and since this solution is working, it is still 
more helpful than anyone noticing that you've accessed a private 
attribute (some will successfully argue that python allows to do so).

At the very begining of this thread I've provided a complete different 
approach, instead of using the builtin 'filename' and 'lineno' field of 
the logging, use custom fileds with the extra parameter.

It has also some drawbacks but could be a possible alternative.

Cheers,

JM

in test.py:

import logging
import inspect

_logger = logging.getLogger(__name__)

class Foo:
   def __init__(self):
       self._logger = _logger

   def info(self, msg):
       # this is the method you don't want to appear in the logs, 
instead the lineno and filename of this method caller
       previousFrame = inspect.currentframe().f_back
       self._logger.info(msg, 
extra={'custom_lineno':previousFrame.f_lineno, 'custom_filename': 
previousFrame.f_code.co_filename})

if __name__ == '__main__':
   _logger.handlers=[]
   _logger.addHandler(logging.StreamHandler())
   _logger.handlers[-1].setFormatter(logging.Formatter('file 
%(custom_filename)s line %(custom_lineno)d : %(message)s'))
   _logger.setLevel(logging.DEBUG)
   foo = Foo()
   foo.info('a foo info')

In [3]: run test.py
file test.py line 20 : a foo info



From królewna at ee.pl  Fri Mar 19 09:58:22 2010
From: królewna at ee.pl (=?ISO-8859-2?Q?kr=F3lewna?=)
Date: Fri, 19 Mar 2010 14:58:22 +0100
Subject: SOLUTION
In-Reply-To: <hnt81m$fsi$1@news.task.gda.pl>
References: <hnt81m$fsi$1@news.task.gda.pl>
Message-ID: <hnvvtt$u1p$1@news.task.gda.pl>

I have found the solution. I dont know why in python documentation there 
is not a single word about this option. I've found it in pysqlite doc 
site. So we have to add a new keyword argument to connection function 
and we will be able to create cursors out of it in different thread. So use:

sqlite.connect(":memory:", check_same_thread = False)

works out perfectly for me. Of course from now on me need to take care 
of safe multithreading access to the db. Anyway thx all for trying to help.

--
best regards
princess


From stefan_ml at behnel.de  Fri Mar 19 10:11:42 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 19 Mar 2010 15:11:42 +0100
Subject: C-API PyObject_Call
In-Reply-To: <fd5b82be-b56c-4024-ad3b-b1a53698cf1f@r27g2000yqn.googlegroups.com>
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>	<mailman.849.1268756405.23598.python-list@python.org>	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>	<mailman.858.1268759662.23598.python-list@python.org>	<c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>	<mailman.883.1268808393.23598.python-list@python.org>	<3592cca0-2a4a-4a19-9e10-d80936e6d200@upsg2000gro.googlegroups.com>	<mailman.943.1268899999.23598.python-list@python.org>	<793e5934-bc1b-4023-aa0e-bf6d956177fd@f8g2000yqn.googlegroups.com>	<mailman.956.1268930626.23598.python-list@python.org>
	<fd5b82be-b56c-4024-ad3b-b1a53698cf1f@r27g2000yqn.googlegroups.com>
Message-ID: <ho00mu$dgi$1@dough.gmane.org>

moerchendiser2k3, 19.03.2010 14:12:
> In my case I call a funcion and I would like to get the line
> where the function returned.
>
> for instance:
>
>
> def my_function():
>      return 3
>
> So I would like to get line 2(in C) somehow.

Ok, so you're looking for the C-level trace function in CPython, I guess.

Could you explain why you want to know the line number?

Stefan



From python at hope.cz  Fri Mar 19 11:32:32 2010
From: python at hope.cz (Johny)
Date: Fri, 19 Mar 2010 08:32:32 -0700 (PDT)
Subject: What is pkg-config for ?
Message-ID: <ad871976-202d-4495-8294-2047573b565b@c16g2000yqd.googlegroups.com>

Can anyone explain what is pkg-config  for?ANd how can I find it in
Windows?
Thanks


From peter_peyman_puk at yahoo.ca  Fri Mar 19 13:09:09 2010
From: peter_peyman_puk at yahoo.ca (Peter Peyman Puk)
Date: Fri, 19 Mar 2010 17:09:09 +0000
Subject: Importing v reloading modules modules
In-Reply-To: <4BA3A738.1050401@ieee.org>
References: <202203.80122.qm@web43401.mail.sp1.yahoo.com>
	<4BA3A738.1050401@ieee.org>
Message-ID: <6A6EB8D2-4910-415D-81A5-FB6C004C9AD9@yahoo.ca>

Hello

I submitted this earlier today, but I was not clear enough, so I am  
posting it again.

I am running a simulator written in python. The simulator has a small  
TextView (actually a SourceView) widget which lets the user writes  
scripts, and when they are satisfied they can execute that script to  
get results. For arguments sake, we write a simple script and save it  
as A.py and we import it and execute it more or less like so.

import A

#assume there is a function called test() in module A
A.test()


Then the user modifies the contents of A.py and saves it again (to  
A.py) now all we have to do is the following

if 'A' in dir():
  reload(A)
else:
  import A

A.test()

But since the user chooses the file name, and not me, the programmer,  
the module names will vary. Let's assume the module names are loaded  
and stored in the list module_names, and we iterate over them, and  
pass them as arguments to a function to import or reload each model as  
appropriate

def import_or_reload(module_name):

  if module_name in sys.modules:
   #somehow reload
  else:
   #somehow import

does anyone know how to deal with the reload and import as they both  
present problems since module_name is a string, and to reload  
something along the lines of the below must be executed

exec 'reload(%s)'%module_name

and then we also have to deal with the scope issue since the loaded  
module will be local and not global. I can execute something like so

exec 'global %s'%module_name

but that does not work very well with exec

any suggestions?

Cheers


Peyman



From slais-www at ucl.ac.uk  Fri Mar 19 13:18:17 2010
From: slais-www at ucl.ac.uk (djc)
Date: Fri, 19 Mar 2010 17:18:17 +0000
Subject: should writing Unicode files be so slow
In-Reply-To: <87ljdov59q.fsf@benfinney.id.au>
References: <hnu9gl$fg7e$1@uns-a.ucl.ac.uk>
	<8739zxw057.fsf@benfinney.id.au>	<hnvpfj$7k76$1@uns-a.ucl.ac.uk>
	<87ljdov59q.fsf@benfinney.id.au>
Message-ID: <ho0bkp$cc3g$1@uns-a.ucl.ac.uk>

Ben Finney wrote:

> What happens, then, when you make a smaller program that deals with only
> one file?
> 
> What happens when you make a smaller program that only reads the file,
> and doesn't write any? Or a different program that only writes a file,
> and doesn't read any?
> 
> It's these sort of reductions that will help narrow down exactly what
> the problem is. Do make sure that each example is also complete (i.e.
> can be run as is by someone who uses only that code with no additions).
> 


The program reads one csv file of 9,293,271 lines.
869M wb.csv
  It  creates  set  of  files containing the  same  lines  but  where  each
 output file in the set  contains only those lines where the value of a
particular column is the same, the number of  output files will depend on
the number of distinct values  in that column In the example that results
in 19 files

74M tt_11696870405.txt
94M tt_18762175493.txt
15M  tt_28668070915.txt
12M tt_28673313795.txt
15M  tt_28678556675.txt
11M  tt_28683799555.txt
12M  tt_28689042435.txt
15M  tt_28694285315.txt
7.3M  tt_28835845125.txt
6.8M tt_28842136581.txt
12M  tt_28848428037.txt
11M  tt_28853670917.txt
12M  tt_28858913797.txt
15M  tt_28864156677.txt
11M  tt_28869399557.txt
11M  tt_28874642437.txt
283M  tt_31002203141.txt
259M  tt_33335282691.txt
45 2010-03-19 17:00 tt_taskid.txt

changing
with open(filename, 'rU') as tabfile:
to
with codecs.open(filename, 'rU', 'utf-8', 'backslashreplace') as tabfile:

and
with open(outfile, 'wt') as out_part:
to
with codecs.open(outfile, 'w', 'utf-8') as out_part:

causes a program that runs  in
43 seconds to take 4 minutes to process the same data. In this particular
case  that is  not very  important, any unicode strings in the data are not
worth troubling over and I have already  spent more  time satisfying
curiousity  that  will  ever  be  required  to  process  the dataset  in
future.  But  I have another  project  in  hand where not only is the
unicode significant but the files are very much larger. Scale up the
problem and the difference between 4 hours and 24 become a matter worth
some attention.



-- 
David Clark, MSc, PhD.              UCL Centre for Publishing
                                    Gower Str London WCIE 6BT
What sort of web animal are you?
            <https://www.bbc.co.uk/labuk/experiments/webbehaviour>


From incensedprey at gmail.com  Fri Mar 19 13:42:53 2010
From: incensedprey at gmail.com (Kevin Adams)
Date: Fri, 19 Mar 2010 10:42:53 -0700 (PDT)
Subject: [python3]
Message-ID: <e6ed708b-c010-451d-8de7-8a885c788d4b@t20g2000yqe.googlegroups.com>

Greetings!

Please forgive me if im posting this to the wrong group.

I'm new to Python, learning Python3 from the O'rielly "Learning
Python" book.  Reading
about operator overloading, specifically __getitem__.   I put together
a small bit of code to
do some experimenting and threw in a timer so i can see it do its
thing.  For some reason
the time.sleep(x) function doesnt work when my print function includes
"end=''".

Thanks in advance for any help.


---code---

class TestClass():
    def __init__(self):
        self.data = "I was far from home and the spell of the eastern
sea was upon me."

    def __getitem__(self,i):
        return self.data[i]


import time

if __name__ == "__main__":

    me = TestClass()
    for x in me:
        print(x,end='')  #if i remove the 'end='''  it performs as i'd
expect
        time.sleep(int(2))



From tjreedy at udel.edu  Fri Mar 19 14:02:02 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 19 Mar 2010 14:02:02 -0400
Subject: Importing v reloading modules modules
In-Reply-To: <6A6EB8D2-4910-415D-81A5-FB6C004C9AD9@yahoo.ca>
References: <202203.80122.qm@web43401.mail.sp1.yahoo.com>	<4BA3A738.1050401@ieee.org>
	<6A6EB8D2-4910-415D-81A5-FB6C004C9AD9@yahoo.ca>
Message-ID: <ho0e6p$4lm$1@dough.gmane.org>

Reload is effectively deprecated in 2.x and removed in 3.x, so I 
recommend not using it.

Deleting an entry from sys.modules should force recreation with an 
import. Just make sure all other references are also gone so that the 
module object can be deleted.

The following shows how to import by name in string and globally from 
within a function.

def f():
     global itertools
     itertools = __import__('itertools')

f()
print(itertools) # 3.1

#<module 'itertools' (built-in)>

Terry Jan Reedy



From steve at holdenweb.com  Fri Mar 19 14:17:31 2010
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 19 Mar 2010 14:17:31 -0400
Subject: [python3]
In-Reply-To: <e6ed708b-c010-451d-8de7-8a885c788d4b@t20g2000yqe.googlegroups.com>
References: <e6ed708b-c010-451d-8de7-8a885c788d4b@t20g2000yqe.googlegroups.com>
Message-ID: <ho0f44$7m8$1@dough.gmane.org>

Kevin Adams wrote:
> Greetings!
> 
> Please forgive me if im posting this to the wrong group.
> 
> I'm new to Python, learning Python3 from the O'rielly "Learning
> Python" book.  Reading
> about operator overloading, specifically __getitem__.   I put together
> a small bit of code to
> do some experimenting and threw in a timer so i can see it do its
> thing.  For some reason
> the time.sleep(x) function doesnt work when my print function includes
> "end=''".
> 
> Thanks in advance for any help.
> 
> 
Try the following changes:

> ---code---
> 
> class TestClass():
>     def __init__(self):
>         self.data = "I was far from home and the spell of the eastern
> sea was upon me."
> 
>     def __getitem__(self,i):
>         return self.data[i]
> 
> 
> import time

import sys
> 
> if __name__ == "__main__":
> 
>     me = TestClass()
>     for x in me:
>         print(x,end='')  #if i remove the 'end='''  it performs as i'd
> expect
          sys.stdout.flush()

>         time.sleep(int(2))
> 

It may just be that the output is being held in buffers until the
program terminates. the fluch() methof pushes it straight out.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From krister.svanlund at gmail.com  Fri Mar 19 14:19:04 2010
From: krister.svanlund at gmail.com (Krister Svanlund)
Date: Fri, 19 Mar 2010 19:19:04 +0100
Subject: [python3]
In-Reply-To: <e6ed708b-c010-451d-8de7-8a885c788d4b@t20g2000yqe.googlegroups.com>
References: <e6ed708b-c010-451d-8de7-8a885c788d4b@t20g2000yqe.googlegroups.com>
Message-ID: <2cf430a61003191119h688fef20u528f7e154680c00c@mail.gmail.com>

On Fri, Mar 19, 2010 at 6:42 PM, Kevin Adams <incensedprey at gmail.com> wrote:
> Greetings!
>
> Please forgive me if im posting this to the wrong group.
>
> I'm new to Python, learning Python3 from the O'rielly "Learning
> Python" book. ?Reading
> about operator overloading, specifically __getitem__. ? I put together
> a small bit of code to
> do some experimenting and threw in a timer so i can see it do its
> thing. ?For some reason
> the time.sleep(x) function doesnt work when my print function includes
> "end=''".
>
> Thanks in advance for any help.
>
>
> ---code---
>
> class TestClass():
> ? ?def __init__(self):
> ? ? ? ?self.data = "I was far from home and the spell of the eastern
> sea was upon me."
>
> ? ?def __getitem__(self,i):
> ? ? ? ?return self.data[i]
>
>
> import time
>
> if __name__ == "__main__":
>
> ? ?me = TestClass()
> ? ?for x in me:
> ? ? ? ?print(x,end='') ?#if i remove the 'end=''' ?it performs as i'd
> expect
> ? ? ? ?time.sleep(int(2))
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>

I'm guessing wildly here but I think you have to flush the output.
Can't remember how right now but it won't take much googling for it.


From tjreedy at udel.edu  Fri Mar 19 14:21:34 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 19 Mar 2010 14:21:34 -0400
Subject: [python3]
In-Reply-To: <e6ed708b-c010-451d-8de7-8a885c788d4b@t20g2000yqe.googlegroups.com>
References: <e6ed708b-c010-451d-8de7-8a885c788d4b@t20g2000yqe.googlegroups.com>
Message-ID: <ho0fbd$8vq$1@dough.gmane.org>

On 3/19/2010 1:42 PM, Kevin Adams wrote:

> Please forgive me if im posting this to the wrong group.

Just the right place. I would suggest a more informative title in the 
future though. 'Problem with print and sleep.', for instance.

>
> I'm new to Python, learning Python3 from the O'rielly "Learning
> Python" book.  Reading
> about operator overloading, specifically __getitem__.   I put together
> a small bit of code to
> do some experimenting and threw in a timer so i can see it do its
> thing.

Good idea. Welcome to Python.

>  For some reason
> the time.sleep(x) function doesnt work when my print function includes
> "end=''".

I cut your code, pasted it into IDLE edit window, and made two minor 
modifications. For me (3.1, winxp) it works perfectly either way -- 
chars print at 1 sec intervals either vertically or horizonatally. So I 
am not sure what you are claiming.
>
> Thanks in advance for any help.
>
>
> ---code---
>
> class TestClass():
>      def __init__(self):
>          self.data = "I was far from home and the spell of the eastern
> sea was upon me."

I shortened string
>
>      def __getitem__(self,i):
>          return self.data[i]
>
> import time
>
> if __name__ == "__main__":
>
>      me = TestClass()
>      for x in me:
>          print(x,end='')  #if i remove the 'end='''  it performs as i'd
> expect
>          time.sleep(int(2))

int(2) == 2, so delete irrelevant call, and 1 sec is enough

Terry Jan Reedy




From incensedprey at gmail.com  Fri Mar 19 14:46:40 2010
From: incensedprey at gmail.com (Kevin Adams)
Date: Fri, 19 Mar 2010 11:46:40 -0700 (PDT)
Subject: [python3]
References: <e6ed708b-c010-451d-8de7-8a885c788d4b@t20g2000yqe.googlegroups.com>
	<mailman.983.1269022911.23598.python-list@python.org>
Message-ID: <5780a357-08a2-4393-9b2d-e07e4bb14b83@q16g2000yqq.googlegroups.com>

On Mar 19, 2:21?pm, Terry Reedy <tjre... at udel.edu> wrote:
> On 3/19/2010 1:42 PM, Kevin Adams wrote:
>
> > Please forgive me if im posting this to the wrong group.
>
> Just the right place. I would suggest a more informative title in the
> future though. 'Problem with print and sleep.', for instance.
>
>
>
> > I'm new to Python, learning Python3 from the O'rielly "Learning
> > Python" book. ?Reading
> > about operator overloading, specifically __getitem__. ? I put together
> > a small bit of code to
> > do some experimenting and threw in a timer so i can see it do its
> > thing.
>
> Good idea. Welcome to Python.
>
> > ?For some reason
> > the time.sleep(x) function doesnt work when my print function includes
> > "end=''".
>
> I cut your code, pasted it into IDLE edit window, and made two minor
> modifications. For me (3.1, winxp) it works perfectly either way --
> chars print at 1 sec intervals either vertically or horizonatally. So I
> am not sure what you are claiming.
>
>
>
> > Thanks in advance for any help.
>
> > ---code---
>
> > class TestClass():
> > ? ? ?def __init__(self):
> > ? ? ? ? ?self.data = "I was far from home and the spell of the eastern
> > sea was upon me."
>
> I shortened string
>
>
>
> > ? ? ?def __getitem__(self,i):
> > ? ? ? ? ?return self.data[i]
>
> > import time
>
> > if __name__ == "__main__":
>
> > ? ? ?me = TestClass()
> > ? ? ?for x in me:
> > ? ? ? ? ?print(x,end='') ?#if i remove the 'end=''' ?it performs as i'd
> > expect
> > ? ? ? ? ?time.sleep(int(2))
>
> int(2) == 2, so delete irrelevant call, and 1 sec is enough
>
> Terry Jan Reedy

Thanks to all!!!

It did indeed turn out to be a need to flush the stdout.

K

ps.  sorry for the brief subject, i wasnt finish and hit send before
comming back to it.



From heintest at web.de  Fri Mar 19 14:46:45 2010
From: heintest at web.de (=?ISO-8859-15?Q?Hans_M=FCller?=)
Date: Fri, 19 Mar 2010 19:46:45 +0100
Subject: Reserving binary Buffer for struct.pack_into() of exact length
Message-ID: <4ba3c6ce$0$6990$9b4e6d93@newsspool4.arcor-online.net>

Hello,

I need some buffers, which are beeing concatenated an then send via 
the socket() function.
My problem is that create_string_buffer() creates a buffer which ist 
one byte too long (for a \0 char). But when I concatenate some of 
these buffers to a long one to be transfered, the extra byte is 
corrupting the resulting buffer.
Of course I could slice the buffer before being concatended, but
this looks ugly to me.
Is there a way to create a writeable buffer object without the \0 byte ?

Thanks a lot

Hans


From tjreedy at udel.edu  Fri Mar 19 15:02:56 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 19 Mar 2010 15:02:56 -0400
Subject: [python3]
In-Reply-To: <ho0f44$7m8$1@dough.gmane.org>
References: <e6ed708b-c010-451d-8de7-8a885c788d4b@t20g2000yqe.googlegroups.com>
	<ho0f44$7m8$1@dough.gmane.org>
Message-ID: <ho0hov$hkb$1@dough.gmane.org>

On 3/19/2010 2:17 PM, Steve Holden wrote:
> Kevin Adams wrote:
>> Greetings!
>>
>> Please forgive me if im posting this to the wrong group.
>>
>> I'm new to Python, learning Python3 from the O'rielly "Learning
>> Python" book.  Reading
>> about operator overloading, specifically __getitem__.   I put together
>> a small bit of code to
>> do some experimenting and threw in a timer so i can see it do its
>> thing.  For some reason
>> the time.sleep(x) function doesnt work when my print function includes
>> "end=''".
>>
>> Thanks in advance for any help.
>>
>>
> Try the following changes:
>
>> ---code---
>>
>> class TestClass():
>>      def __init__(self):
>>          self.data = "I was far from home and the spell of the eastern
>> sea was upon me."
>>
>>      def __getitem__(self,i):
>>          return self.data[i]
>>
>>
>> import time
>
> import sys
>>
>> if __name__ == "__main__":
>>
>>      me = TestClass()
>>      for x in me:
>>          print(x,end='')  #if i remove the 'end='''  it performs as i'd
>> expect
>            sys.stdout.flush()
>
>>          time.sleep(int(2))
>
> It may just be that the output is being held in buffers until the
> program terminates. the fluch() methof pushes it straight out.

The IDLE Shell window must get print output back from the pythonw 
process without buffering. When I cut and pasted from IDLE editor to 
standard interpreter window, output was bunched after several seconds. 
OP should have started with short string and minimal delay so output 
would not take a whole minute. Flushing fixed problem in standard 
interpreter. I will have to remember that testing partial line output in 
IDLE does not show how it will act elsewhere.

Kevin: when reporting a problem, be more specific as to what 'does not 
work' means.

Terry Jan Reedy



From emile at fenx.com  Fri Mar 19 16:33:00 2010
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 19 Mar 2010 13:33:00 -0700
Subject: Reserving binary Buffer for struct.pack_into() of exact length
In-Reply-To: <4ba3c6ce$0$6990$9b4e6d93@newsspool4.arcor-online.net>
References: <4ba3c6ce$0$6990$9b4e6d93@newsspool4.arcor-online.net>
Message-ID: <ho0n1d$4is$1@dough.gmane.org>

On 3/19/2010 11:46 AM Hans M?ller said...
> Hello,
>
> I need some buffers, which are beeing concatenated an then send via the
> socket() function.
> My problem is that create_string_buffer() creates a buffer which ist one
> byte too long (for a \0 char). But when I concatenate some of these
> buffers to a long one to be transfered, the extra byte is corrupting the
> resulting buffer.
> Of course I could slice the buffer before being concatended, but
> this looks ugly to me.
> Is there a way to create a writeable buffer object without the \0 byte ?
>
> Thanks a lot
>
> Hans

 >>> p = create_string_buffer(5)
 >>> p.raw='hello'
 >>> p.value
'hello'



From saimapk81 at gmail.com  Fri Mar 19 17:03:41 2010
From: saimapk81 at gmail.com (saima81)
Date: Fri, 19 Mar 2010 14:03:41 -0700 (PDT)
Subject: "Sexy Girls" "Sexy Indian Girls" "Sexy USA Girls" "Sexy RUSSIAN 
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	"Sexy JAPANESE Girls" "Sexy KOREAN Girls" "Sexy MODEL  Girls"  ON 
	www.sexyandpretty-girls.blogspot.com
Message-ID: <b6e93024-2537-4b25-8ae5-1474cd180944@t32g2000prg.googlegroups.com>

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From brandonc530 at gmail.com  Fri Mar 19 17:10:54 2010
From: brandonc530 at gmail.com (Brandon C)
Date: Fri, 19 Mar 2010 16:10:54 -0500
Subject: Truoble With A Search Script for ImageBin.org
In-Reply-To: <3020ae661003181800u55a5a654v7be4a524123eec65@mail.gmail.com>
References: <3020ae661003181800u55a5a654v7be4a524123eec65@mail.gmail.com>
Message-ID: <3020ae661003191410i2f5e831et16dbd6fbf9e67e4d@mail.gmail.com>

*grumble* *grumble* *grumble*

oops, sorry ... my mistake

it turns out that i misspelled one of the values and left another one out.
 here's the working script now for anyone who may care:

import urllib
import urllib2
url = 'http://imagebin.org/index.php?page=search'
values = {'search_for' : 'blah', 'field' : 'nickname', 'mode' : 'search'}
data = urllib.urlencode(values)
request = urllib2.Request(url, data)
response = urllib2.urlopen(request)
page = response.read()
print page

the value of 'field' is 'nickname, not 'Nickname';
and i left out the 'mode' one

tks for yalls help
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From gagsl-py2 at yahoo.com.ar  Fri Mar 19 17:12:14 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 19 Mar 2010 18:12:14 -0300
Subject: What is pkg-config for ?
References: <ad871976-202d-4495-8294-2047573b565b@c16g2000yqd.googlegroups.com>
Message-ID: <op.u9t2iolix6zn5v@lepton.softlabbsas.com.ar>

En Fri, 19 Mar 2010 12:32:32 -0300, Johny <python at hope.cz> escribi?:

> Can anyone explain what is pkg-config  for?ANd how can I find it in
> Windows?

Go to http://www.google.com/
Enter "pkg-config windows" (without quotes) in the input box.
Press the Search button.
You'll get this site at the top, or near it:
http://pkg-config.freedesktop.org/wiki/

I fail to see how is this relevant to Python...

-- 
Gabriel Genellina



From brandonc530 at gmail.com  Fri Mar 19 18:02:25 2010
From: brandonc530 at gmail.com (Brandon C)
Date: Fri, 19 Mar 2010 17:02:25 -0500
Subject: script to upload file using POST form
Message-ID: <3020ae661003191502r1b87844fj3af5a0ccd45a3120@mail.gmail.com>

got another question for yall wonderful minds; how can i upload a file to a
server that uses a POST form?

here's the link to the form that i'd like to be able to upload a file:
http://imagebin.org/index.php?page=add

tks
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From gagsl-py2 at yahoo.com.ar  Fri Mar 19 18:23:59 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 19 Mar 2010 19:23:59 -0300
Subject: should writing Unicode files be so slow
References: <hnu9gl$fg7e$1@uns-a.ucl.ac.uk> <8739zxw057.fsf@benfinney.id.au>
	<hnvpfj$7k76$1@uns-a.ucl.ac.uk> <87ljdov59q.fsf@benfinney.id.au>
	<ho0bkp$cc3g$1@uns-a.ucl.ac.uk>
Message-ID: <op.u9t5t9qkx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 19 Mar 2010 14:18:17 -0300, djc <slais-www at ucl.ac.uk> escribi?:
> Ben Finney wrote:
>
>> What happens, then, when you make a smaller program that deals with only
>> one file?
>>
>> What happens when you make a smaller program that only reads the file,
>> and doesn't write any? Or a different program that only writes a file,
>> and doesn't read any?
>>
>> It's these sort of reductions that will help narrow down exactly what
>> the problem is. Do make sure that each example is also complete (i.e.
>> can be run as is by someone who uses only that code with no additions).
>>
>
>
> The program reads one csv file of 9,293,271 lines.
> 869M wb.csv
>   It  creates  set  of  files containing the  same  lines  but  where   
> each
>  output file in the set  contains only those lines where the value of a
> particular column is the same, the number of  output files will depend on
> the number of distinct values  in that column In the example that results
> in 19 files
>
> changing
> with open(filename, 'rU') as tabfile:
> to
> with codecs.open(filename, 'rU', 'utf-8', 'backslashreplace') as tabfile:
>
> and
> with open(outfile, 'wt') as out_part:
> to
> with codecs.open(outfile, 'w', 'utf-8') as out_part:
>
> causes a program that runs  in
> 43 seconds to take 4 minutes to process the same data. In this particular
> case  that is  not very  important, any unicode strings in the data are  
> not
> worth troubling over and I have already  spent more  time satisfying
> curiousity  that  will  ever  be  required  to  process  the dataset  in
> future.  But  I have another  project  in  hand where not only is the
> unicode significant but the files are very much larger. Scale up the
> problem and the difference between 4 hours and 24 become a matter worth
> some attention.

Ok. Your test program is too large to determine what's going on. Try to  
determine first *which* part is slow:

- reading: measure the time it takes only to read a file, with open() and  
codecs.open()
It might be important the density of non-ascii characters and their  
relative code points (as utf-8 is much more efficient for ASCII data than,  
say, Hanzi)
- processing: measure the time it takes the processing part (fed with str  
vs unicode data)
- writing: measure the time it takes only to write a file, with open() and  
codecs.open()

Only then one can focus on optimizing the bottleneck.

-- 
Gabriel Genellina



From barry at python.org  Fri Mar 19 18:56:55 2010
From: barry at python.org (Barry Warsaw)
Date: Fri, 19 Mar 2010 18:56:55 -0400
Subject: RELEASED Python 2.6.5
Message-ID: <20100319185655.26e1bf1a@heresy>

On behalf of the Python community, I'm happy to announce the availability of
Python 2.6.5 final.  This is the latest production-ready version in the Python
2.6 series.

Python 2.6.5 fixes dozens of issues in the core, built-in modules, libraries,
and documentation since Python 2.6.4 was released back in October 2009.  We
highly recommend that you upgrade to Python 2.6.5.

Please see the NEWS file for all the gory details.

    http://www.python.org/download/releases/2.6.5/NEWS.txt

Source tarballs and the Windows installers can be downloaded from the Python
2.6.5 page.  The Mac OS X disk image will be uploaded soon.

    http://www.python.org/download/releases/2.6.5/

For more information on Python 2.6 in general, please see

    http://docs.python.org/whatsnew/2.6.html

Please report bugs for any Python version in the Python tracker.

    http://bugs.python.org

Enjoy,
-Barry

Barry Warsaw
barry at python.org
Python 2.6 Release Manager
(on behalf of the entire python-dev team)
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From ben+python at benfinney.id.au  Fri Mar 19 19:01:44 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sat, 20 Mar 2010 10:01:44 +1100
Subject: should writing Unicode files be so slow
References: <hnu9gl$fg7e$1@uns-a.ucl.ac.uk> <8739zxw057.fsf@benfinney.id.au>
	<hnvpfj$7k76$1@uns-a.ucl.ac.uk> <87ljdov59q.fsf@benfinney.id.au>
	<ho0bkp$cc3g$1@uns-a.ucl.ac.uk>
	<mailman.989.1269037452.23598.python-list@python.org>
Message-ID: <87d3yzvrtz.fsf@benfinney.id.au>

"Gabriel Genellina" <gagsl-py2 at yahoo.com.ar> writes:

> Ok. Your test program is too large to determine what's going on. Try
> to determine first *which* part is slow:

Right. This is done by the diagnostic technique of writing *new*,
minimal, complete programs that exercise each piece of the functionality
separately.

You're not tinkering with the existing program that's misbehaving;
you're trying to *recreate* the misbehaviour under a simpler
environment.

Hope that helps. Feel free to continue posting complete minimal programs
that exercise one thing and show behaviour you're unsure about.

-- 
 \         ?We now have access to so much information that we can find |
  `\  support for any prejudice or opinion.? ?David Suzuki, 2008-06-27 |
_o__)                                                                  |
Ben Finney


From gagsl-py2 at yahoo.com.ar  Fri Mar 19 19:04:01 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 19 Mar 2010 20:04:01 -0300
Subject: script to upload file using POST form
References: <3020ae661003191502r1b87844fj3af5a0ccd45a3120@mail.gmail.com>
Message-ID: <op.u9t7ozr3x6zn5v@lepton.softlabbsas.com.ar>

En Fri, 19 Mar 2010 19:02:25 -0300, Brandon C <brandonc530 at gmail.com>  
escribi?:

> got another question for yall wonderful minds; how can i upload a file  
> to a
> server that uses a POST form?
>
> here's the link to the form that i'd like to be able to upload a file:
> http://imagebin.org/index.php?page=add

Unfortunately it isn't as easy as it should be:
http://bugs.python.org/issue3244

-- 
Gabriel Genellina



From steve at holdenweb.com  Fri Mar 19 19:32:44 2010
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 19 Mar 2010 19:32:44 -0400
Subject: Python Documentation website layout changed?
In-Reply-To: <4BA120A9.3060001@holdenweb.com>
References: <21fcbd63-fd1e-4b53-89b3-393c15591372@m37g2000yqf.googlegroups.com>	<27c7e0a7-5a26-40f2-94ba-0af9cb530d67@g28g2000yqh.googlegroups.com>
	<4BA120A9.3060001@holdenweb.com>
Message-ID: <ho11iv$69f$1@dough.gmane.org>

Steve Holden wrote:
> Andrej Mitrovic wrote:
>> On Mar 17, 6:41 pm, Andrej Mitrovic <andrej.mitrov... at gmail.com>
>> wrote:
>>> Hi,
>>>
>>> What happened to the sidebar on the left of the documentation website?
>>> It seems to be gone:
>>>
>>> http://docs.python.org/py3k/index.html
>>>
>>> I found it quite useful since I can quickly swap between Python2/3
>>> documentation, and between other parts of the documentation as well.
>> Edit: It looks like only the Python 3 pages are affected, the Python 2
>> pages are the same as before:
>>
>> http://docs.python.org/index.html
>>
>> Might be a bug?
> 
> I'll ask. Georg - is this known behavior or a temporary problem?
> 
It's a bug. Georg is on it.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From solipsis at pitrou.net  Fri Mar 19 20:19:07 2010
From: solipsis at pitrou.net (Antoine Pitrou)
Date: Sat, 20 Mar 2010 00:19:07 +0000 (UTC)
Subject: should writing Unicode files be so slow
References: <hnu9gl$fg7e$1@uns-a.ucl.ac.uk> <8739zxw057.fsf@benfinney.id.au>
	<hnvpfj$7k76$1@uns-a.ucl.ac.uk> <87ljdov59q.fsf@benfinney.id.au>
	<ho0bkp$cc3g$1@uns-a.ucl.ac.uk>
Message-ID: <ho149r$cl6$1@dough.gmane.org>

Le Fri, 19 Mar 2010 17:18:17 +0000, djc a ?crit?:
> 
> changing
> with open(filename, 'rU') as tabfile: to
> with codecs.open(filename, 'rU', 'utf-8', 'backslashreplace') as
> tabfile:
> 
> and
> with open(outfile, 'wt') as out_part: to
> with codecs.open(outfile, 'w', 'utf-8') as out_part:
> 
> causes a program that runs  in
> 43 seconds to take 4 minutes to process the same data.

codecs.open() (and the object it returns) is slow as it is written in 
pure Python.

Accelerated reading and writing of unicode files is available in Python 
2.7 and 3.1, using the new `io` module.

Regards

Antoine.




From speeze.pearson at gmail.com  Fri Mar 19 20:20:31 2010
From: speeze.pearson at gmail.com (Spencer Pearson)
Date: Fri, 19 Mar 2010 17:20:31 -0700 (PDT)
Subject: Tuples vs. variable-length argument lists
Message-ID: <843bf1a3-6e9b-48d2-8661-b3f776a6fde2@t32g2000prg.googlegroups.com>

Hi!

This might be more of a personal-preference question than anything,
but here goes: when is it appropriate for a function to take a list or
tuple as input, and when should it allow a varying number of
arguments? It seems as though the two are always interchangeable. For
a simple example...

def subtract( x, nums ):
  return x - sum( nums )

... works equally well if you define it as "subtract( x, *nums )" and
put an asterisk in front of any lists/tuples you pass it. I can't
think of any situation where you couldn't convert from one form to the
other with just a star or a pair of parentheses.

Is there a generally accepted convention for which method to use? Is
there ever actually a big difference between the two that I'm not
seeing?


From gagsl-py2 at yahoo.com.ar  Fri Mar 19 21:28:12 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 19 Mar 2010 22:28:12 -0300
Subject: Importing v reloading modules modules
References: <202203.80122.qm@web43401.mail.sp1.yahoo.com>
	<4BA3A738.1050401@ieee.org>
	<6A6EB8D2-4910-415D-81A5-FB6C004C9AD9@yahoo.ca>
Message-ID: <op.u9uedalzx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 19 Mar 2010 14:09:09 -0300, Peter Peyman Puk  
<peter_peyman_puk at yahoo.ca> escribi?:

> I am running a simulator written in python. The simulator has a small  
> TextView (actually a SourceView) widget which lets the user writes  
> scripts, and when they are satisfied they can execute that script to get  
> results. For arguments sake, we write a simple script and save it as  
> A.py and we import it and execute it more or less like so.
>
> import A
>
> #assume there is a function called test() in module A
> A.test()
>
>
> Then the user modifies the contents of A.py and saves it again (to A.py)  
> now all we have to do is the following
>
> if 'A' in dir():
>   reload(A)
> else:
>   import A
>
> A.test()

Terry Reedy already gave you an answer for this import problem.
I'd like to go one step back and question whether using import/modules is  
the right thing here.
Clearly A.py is not a module but a script (that's the word you used) - and  
one does not *import* a script but *executes* it.
That is, instead of using import/__import__, use exec (or execfile) within  
a known namespace:

import __builtin__
ns = {'__builtins__': __builtin__.__dict__}
exec contents_of_textview in ns
# any change made to ns is visible here

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Fri Mar 19 21:54:58 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Fri, 19 Mar 2010 22:54:58 -0300
Subject: Castrated traceback in sys.exc_info()
References: <7866674b-46ba-49e2-9d76-e8259ba22df0@z3g2000yqz.googlegroups.com>
	<20100317124019.7013dfa3@moriz.interne>
	<9fd96c3b1003170542t4ea864c6y359107cb747536da@mail.gmail.com>
Message-ID: <op.u9uflwxxx6zn5v@lepton.softlabbsas.com.ar>

En Wed, 17 Mar 2010 09:42:06 -0300, Pascal Chambon  
<chambon.pascal at gmail.com> escribi?:

> traceback functions indeed allow the manipulation of exception  
> tracebacks,
> but the root problem is that anyway, since that traceback is incomplete,
> your "traceback.format_exc().splitlines()" will only provide frames for
> callee (downward) functions, not caller (upward) ones, starting from the
> exception catching frame.

Either I don't understand what you mean, or I can't reproduce it:

<code>
import logging

def a(): return b()
def b(): return c()
def c(): return d()
def d(): raise ValueError

def main():
   logging.basicConfig(level=logging.DEBUG)
   try: a()
   except: logging.exception("An error")

main()
</code>

Output:

D:\temp>python test_logging.py
ERROR:root:An error
Traceback (most recent call last):
   File "test_logging.py", line 10, in main
     try: a()
   File "test_logging.py", line 3, in a
     def a(): return b()
   File "test_logging.py", line 4, in b
     def b(): return c()
   File "test_logging.py", line 5, in c
     def c(): return d()
   File "test_logging.py", line 6, in d
     def d(): raise ValueError
ValueError

-- 
Gabriel Genellina



From googler.1.webmaster at spamgourmet.com  Fri Mar 19 21:58:28 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Fri, 19 Mar 2010 18:58:28 -0700 (PDT)
Subject: Simple lock
Message-ID: <9fca30bd-8dd1-4952-a53d-88f44ec2e3ab@z4g2000yqa.googlegroups.com>

Hi,

I have a common question about locks:

class SetPointer
{
private:
	void *ptr;

	MY_LOCK lock;


public:
	void SetPointer(void *p)
	{
		Lock(this->lock);
		this->ptr = p;
	}

	void *GetPointer()
	{
		Lock(this->lock);
		return this->ptr;
	}
};


Just a question, is this lock redundant, when the Pointer can be set/
get from different threads?
Thanks a lot!! Bye, moerchendiser2k3


From googler.1.webmaster at spamgourmet.com  Fri Mar 19 22:01:45 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Fri, 19 Mar 2010 19:01:45 -0700 (PDT)
Subject: C-API PyObject_Call
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>
	<mailman.849.1268756405.23598.python-list@python.org>
	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>
	<mailman.858.1268759662.23598.python-list@python.org>
	<c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>
	<mailman.883.1268808393.23598.python-list@python.org>
	<3592cca0-2a4a-4a19-9e10-d80936e6d200@upsg2000gro.googlegroups.com>
	<mailman.943.1268899999.23598.python-list@python.org>
	<793e5934-bc1b-4023-aa0e-bf6d956177fd@f8g2000yqn.googlegroups.com>
	<mailman.956.1268930626.23598.python-list@python.org>
	<fd5b82be-b56c-4024-ad3b-b1a53698cf1f@r27g2000yqn.googlegroups.com>
	<mailman.978.1269007923.23598.python-list@python.org>
Message-ID: <7597f6a5-5fe0-4a69-9f9b-f0d96f4499d1@g26g2000yqn.googlegroups.com>

Yes, the user is able to set a file which contains a function that
does what the user wants.
But in a case, I expect a special return value of this function.

So, I need to tell him, in which file/line the error occured,
otherwise he dont know
where to look.

Imagine he set 20 files, and all of them have implemented a special
function. So he
wouldnt know where to check for the error.

Bye, moerchendiser2k3


From ben+python at benfinney.id.au  Fri Mar 19 22:24:57 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Sat, 20 Mar 2010 13:24:57 +1100
Subject: Simple lock
References: <9fca30bd-8dd1-4952-a53d-88f44ec2e3ab@z4g2000yqa.googlegroups.com>
Message-ID: <878w9nvifa.fsf@benfinney.id.au>

moerchendiser2k3 <googler.1.webmaster at spamgourmet.com> writes:

> I have a common question about locks:

You'd be best to ask in a forum related to the language you're using.
This (?comp.lang.python?) is a forum for users of the Python language.

-- 
 \         ?If you can do no good, at least do no harm.? ?_Slapstick_, |
  `\                                                     Kurt Vonnegut |
_o__)                                                                  |
Ben Finney


From clp2 at rebertia.com  Fri Mar 19 22:25:27 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Fri, 19 Mar 2010 19:25:27 -0700
Subject: Simple lock
In-Reply-To: <9fca30bd-8dd1-4952-a53d-88f44ec2e3ab@z4g2000yqa.googlegroups.com>
References: <9fca30bd-8dd1-4952-a53d-88f44ec2e3ab@z4g2000yqa.googlegroups.com>
Message-ID: <50697b2c1003191925l6fd1c19alf4f8cdf31053b547@mail.gmail.com>

On Fri, Mar 19, 2010 at 6:58 PM, moerchendiser2k3
<googler.1.webmaster at spamgourmet.com> wrote:
<question about using locks in C++ snipped>
>
> Thanks a lot!! Bye, moerchendiser2k3

This is the **Python** mailinglist/newsgroup; and your question isn't
about Python.

The C++ one is over there:
http://groups.google.com/group/comp.lang.c++.moderated/topics

Regards,
Chris


From python at mrabarnett.plus.com  Fri Mar 19 22:31:23 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 20 Mar 2010 02:31:23 +0000
Subject: Simple lock
In-Reply-To: <9fca30bd-8dd1-4952-a53d-88f44ec2e3ab@z4g2000yqa.googlegroups.com>
References: <9fca30bd-8dd1-4952-a53d-88f44ec2e3ab@z4g2000yqa.googlegroups.com>
Message-ID: <4BA4337B.6050301@mrabarnett.plus.com>

moerchendiser2k3 wrote:
> Hi,
> 
> I have a common question about locks:
> 
> class SetPointer
> {
> private:
> 	void *ptr;
> 
> 	MY_LOCK lock;
> 
> 
> public:
> 	void SetPointer(void *p)
> 	{
> 		Lock(this->lock);
> 		this->ptr = p;
> 	}
> 
> 	void *GetPointer()
> 	{
> 		Lock(this->lock);
> 		return this->ptr;
> 	}
> };
> 
> 
> Just a question, is this lock redundant, when the Pointer can be set/
> get from different threads?
> Thanks a lot!! Bye, moerchendiser2k3

1. That's C++. What does it have to do with Python?

2. The value you're accessing is a simple pointer which you're either
setting or getting, so a lock shouldn't be necessary.

3. You're locking, but never unlocking. The sequence should be: lock, do
stuff, unlock.


From nilly16 at yahoo.com  Fri Mar 19 23:04:08 2010
From: nilly16 at yahoo.com (Jimbo)
Date: Fri, 19 Mar 2010 20:04:08 -0700 (PDT)
Subject: Best Way to extract Numbers from String
Message-ID: <ded7c9a6-e4b1-46f7-97ca-fd66708f7443@g1g2000pre.googlegroups.com>

Hello

I am trying to grab some numbers from a string containing HTML text.
Can you suggest any good functions that I could use to do this? What
would be the easiest way to extract the following numbers from this
string...

My String has this layout & I have commented what I want to grab:
[CODE] """</th>
				<td class="last">43.200 </td>
				<td class="change indicator" nowrap>0.040 </td>

                                                   <td>43.150 </td> #
I need to grab this number only
				<td>43.200 </td>
                                                   <td>43.130 </td> #
I need to grab this number only
				<td>43.290 </td> 				             <td>43.100 </td> # I need to
grab this number only
				<td>7,450,447 </td>
				<td class="middle"><a
					href="/asx/markets/optionPrices.do?
by=underlyingCode&underlyingCode=BHP&expiryDate=&optionType=">Options</
a></td>
				<td class="middle"><a
					href="/asx/markets/warrantPrices.do?
by=underlyingAsxCode&underlyingCode=BHP">Warrants &amp; Structured
Products</a></td>
				<td class="middle"><a
					href="/asx/markets/cfdPrices.do?
by=underlyingAsxCode&underlyingCode=BHP">CFDs</a></td>
				<td class="middle"><a href="http://hfgapps.hubb.com/asxtools/
Charts.aspx?
TimeFrame=D6&amp;compare=comp_index&amp;indicies=XJO&amp;pma1=20&amp;pma2=20&amp;asxCode=BHP"><img
src="/images/chart.gif" border="0" height="15" width="15"></a>
</td>
				<td><a href="/research/announcements/status_notes.htm#XD">XD</a>
				</td>
				<td><a href="/asx/statistics/announcements.do?
by=asxCode&asxCode=BHP&timeframe=D&period=W">Recent</a>
</td>
			</tr>"""[/CODE]


From gagsl-py2 at yahoo.com.ar  Fri Mar 19 23:09:46 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 20 Mar 2010 00:09:46 -0300
Subject: Simple lock
References: <9fca30bd-8dd1-4952-a53d-88f44ec2e3ab@z4g2000yqa.googlegroups.com>
	<4BA4337B.6050301@mrabarnett.plus.com>
Message-ID: <op.u9ui2kxtx6zn5v@lepton.softlabbsas.com.ar>

En Fri, 19 Mar 2010 23:31:23 -0300, MRAB <python at mrabarnett.plus.com>  
escribi?:
> moerchendiser2k3 wrote:

>>  class SetPointer
>> {
>> private:
>> 	void *ptr;
>>  	MY_LOCK lock;
>>   public:
>> 	void SetPointer(void *p)
>> 	{
>> 		Lock(this->lock);
>> 		this->ptr = p;
>> 	}

> 3. You're locking, but never unlocking. The sequence should be: lock, do
> stuff, unlock.

Just FYI: C++ doesn't have try/finally, and such behavior is usually  
emulated using a local object. When it goes out of scope, it is  
automatically destroyed, meaning that the object destructor is called.  
Whatever you would write in a "finally" clause, in C++ goes into a  
destructor.

Of course C++ guys would never say they're "emulating" try/finally,  
instead they declare RAII as *the* Only and Right Way :)

-- 
Gabriel Genellina



From steve at REMOVE-THIS-cybersource.com.au  Fri Mar 19 23:20:38 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 20 Mar 2010 03:20:38 GMT
Subject: Tuples vs. variable-length argument lists
References: <843bf1a3-6e9b-48d2-8661-b3f776a6fde2@t32g2000prg.googlegroups.com>
Message-ID: <4ba43f05$0$27838$c3e8da3@news.astraweb.com>

On Fri, 19 Mar 2010 17:20:31 -0700, Spencer Pearson wrote:

> Hi!
> 
> This might be more of a personal-preference question than anything, but
> here goes: when is it appropriate for a function to take a list or tuple
> as input, and when should it allow a varying number of arguments? 

That depends on the function as well as your personal preference.

Of course, you can also follow the lead of max and min and accept both:

>>> max(1, 2, 3, 4) == max([1, 2, 3, 4])
True

You need to consider which is more "natural" for the semantics of the 
function.


> It seems as though the two are always interchangeable. 

Not always. Consider sum(a, b, c, d).

Should that be "sum the sequence [a, b, c, d]" or "sum the sequence [a, 
b, c] with initial value d"? You might ask what difference it makes, but 
it may make a big difference:

* if a...d are floats, there may be differences in rounding errors 
  between a+b+c+d and d+a+b+c

* if a...d are lists, the order that you do the addition matters:
  ["a", "b", "c"] + ["d"] != ["d"] + ["a", "b", "c"]

* even if a...d are integers, it may make a big difference for
  performance. Perhaps not for a mere four arguments, but watch:

>>> n = 10**1000000
>>> seq = [n] + range(10001)
>>> from timeit import Timer
>>> t1 = Timer("sum(seq)", "from __main__ import n, seq; seq.append(-n)")
>>> t2 = Timer("sum(seq, -n)", "from __main__ import n, seq")
>>> min(t1.repeat(number=1))
6.1270790100097656
>>> min(t2.repeat(number=1))
0.012988805770874023

In the first case, all the intermediate calculations are done using a 
million digit long int, in the second case it is not.

[...]
> I can't think
> of any situation where you couldn't convert from one form to the other
> with just a star or a pair of parentheses.

Of course you can convert, but consider that this is doing a conversion. 
Perhaps that's unnecessary work for your specific function? You are 
packing and unpacking a sequence into a tuple. Whether this is a good 
thing or a bad thing depends on the function.


> Is there a generally accepted convention for which method to use? Is
> there ever actually a big difference between the two that I'm not
> seeing?

If you think of the function as operating on a single argument which is a 
sequence of arbitrary length, then it is best written to take a single 
sequence argument.

If you think of the function as operating on an arbitrary number of 
arguments, then it is best written to take an arbitrary number of 
arguments.

If you think it doesn't matter, then choose whichever model is less work 
for you.

If neither seems better than the other, then choose arbitrarily.

If you don't like the idea of making an arbitrary choice, or if your 
users complain, then support both models (if possible).


-- 
Steven


From gagsl-py2 at yahoo.com.ar  Fri Mar 19 23:21:44 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Sat, 20 Mar 2010 00:21:44 -0300
Subject: Best Way to extract Numbers from String
References: <ded7c9a6-e4b1-46f7-97ca-fd66708f7443@g1g2000pre.googlegroups.com>
Message-ID: <op.u9ujmivrx6zn5v@lepton.softlabbsas.com.ar>

En Sat, 20 Mar 2010 00:04:08 -0300, Jimbo <nilly16 at yahoo.com> escribi?:

> I am trying to grab some numbers from a string containing HTML text.
> Can you suggest any good functions that I could use to do this? What
> would be the easiest way to extract the following numbers from this
> string...
>
> My String has this layout & I have commented what I want to grab:
> [CODE] """</th>
> 				<td class="last">43.200 </td>
> 				<td class="change indicator" nowrap>0.040 </td>
>
>                                                    <td>43.150 </td> #
> I need to grab this number only
> 				<td>43.200 </td>
>                                                    <td>43.130 </td> #
> I need to grab this number only

I'd use BeautifulSoup [1] to handle bad formed HTML like that.

[1] http://www.crummy.com/software/BeautifulSoup/

-- 
Gabriel Genellina



From python at mrabarnett.plus.com  Fri Mar 19 23:38:27 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 20 Mar 2010 03:38:27 +0000
Subject: Simple lock
In-Reply-To: <op.u9ui2kxtx6zn5v@lepton.softlabbsas.com.ar>
References: <9fca30bd-8dd1-4952-a53d-88f44ec2e3ab@z4g2000yqa.googlegroups.com>	<4BA4337B.6050301@mrabarnett.plus.com>
	<op.u9ui2kxtx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <4BA44333.8010308@mrabarnett.plus.com>

Gabriel Genellina wrote:
> En Fri, 19 Mar 2010 23:31:23 -0300, MRAB <python at mrabarnett.plus.com> 
> escribi?:
>> moerchendiser2k3 wrote:
> 
>>>  class SetPointer
>>> {
>>> private:
>>>     void *ptr;
>>>      MY_LOCK lock;
>>>   public:
>>>     void SetPointer(void *p)
>>>     {
>>>         Lock(this->lock);
>>>         this->ptr = p;
>>>     }
> 
>> 3. You're locking, but never unlocking. The sequence should be: lock, do
>> stuff, unlock.
> 
> Just FYI: C++ doesn't have try/finally, and such behavior is usually 
> emulated using a local object. When it goes out of scope, it is 
> automatically destroyed, meaning that the object destructor is called. 
> Whatever you would write in a "finally" clause, in C++ goes into a 
> destructor.
> 
> Of course C++ guys would never say they're "emulating" try/finally, 
> instead they declare RAII as *the* Only and Right Way :)
> 
Lock() doesn't look like a declaration, but a function call (although
it's been a while since I last did C++!).

In the past I've written some C++ code where try..finally... would've
been useful... *sigh*


From alfps at start.no  Sat Mar 20 00:15:08 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Sat, 20 Mar 2010 05:15:08 +0100
Subject: Simple lock
In-Reply-To: <mailman.1000.1269056309.23598.python-list@python.org>
References: <9fca30bd-8dd1-4952-a53d-88f44ec2e3ab@z4g2000yqa.googlegroups.com>	<4BA4337B.6050301@mrabarnett.plus.com>	<op.u9ui2kxtx6zn5v@lepton.softlabbsas.com.ar>
	<mailman.1000.1269056309.23598.python-list@python.org>
Message-ID: <ho1i4f$7vt$1@news.eternal-september.org>

* MRAB:
> Gabriel Genellina wrote:
>> En Fri, 19 Mar 2010 23:31:23 -0300, MRAB <python at mrabarnett.plus.com> 
>> escribi?:
>>> moerchendiser2k3 wrote:
>>
>>>>  class SetPointer
>>>> {
>>>> private:
>>>>     void *ptr;
>>>>      MY_LOCK lock;
>>>>   public:
>>>>     void SetPointer(void *p)
>>>>     {
>>>>         Lock(this->lock);
>>>>         this->ptr = p;
>>>>     }
>>
>>> 3. You're locking, but never unlocking. The sequence should be: lock, do
>>> stuff, unlock.
>>
>> Just FYI: C++ doesn't have try/finally, and such behavior is usually 
>> emulated using a local object. When it goes out of scope, it is 
>> automatically destroyed, meaning that the object destructor is called. 
>> Whatever you would write in a "finally" clause, in C++ goes into a 
>> destructor.
>>
>> Of course C++ guys would never say they're "emulating" try/finally, 
>> instead they declare RAII as *the* Only and Right Way :)
>>
> Lock() doesn't look like a declaration, but a function call (although
> it's been a while since I last did C++!).

Right. But the OP is clearly a beginner who has yet to learn conventions (like 
all uppercase reserved for macros) and good versus bad programming constructs 
(like using void*), and who is even confusing C++ with Python. So it might just 
be that 'Lock' is a macro, and then it can expand to anything.


> In the past I've written some C++ code where try..finally... would've
> been useful... *sigh*

Check out Marginean and Alexandrescu's ScopeGuard. Old DDJ-article. For MSVC you 
may want to change use of __LINE__ in that code, to MS-specific __COUNTER__.

Fwiw. I can't remember ever needing 'finally' in C++ code.

It indicates a lack of encapsulation of entitites that should clean up 
themselves. Simple smart pointers etc. can help. E.g., check out Boost library.


Cheers & hth., even if a little off-topic,

- Alf


From kse.listed.co1 at gmail.com  Sat Mar 20 00:18:15 2010
From: kse.listed.co1 at gmail.com (Naeem)
Date: Fri, 19 Mar 2010 21:18:15 -0700 (PDT)
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" 
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY 
	RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS"
	"SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
Message-ID: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>

"EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY
FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com       "SEXY
RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS"
"SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE"
"MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
"SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
"PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
"SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
"SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
"PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
"SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
"SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
"PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
"SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
"SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
"PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
"SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
"SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
"PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
"SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
"SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
"PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
"SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
"SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
"PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
"SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
"SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
"PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
"SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
"SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
"PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
"SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
"SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
"PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
"SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
"SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
"PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
"SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
"SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
"PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
"SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"


From aahz at pythoncraft.com  Sat Mar 20 00:39:38 2010
From: aahz at pythoncraft.com (Aahz)
Date: 19 Mar 2010 21:39:38 -0700
Subject: (updated) Choosing a collection of common modules/packages for a
	general purpose    reusable PY2EXE runtime
References: <1268143741.31835.1363885481@webmail.messagingengine.com>
	<mailman.491.1268144871.23598.python-list@python.org>
Message-ID: <ho1jia$2pb$1@panix3.panix.com>

In article <mailman.491.1268144871.23598.python-list at python.org>,
 <python at bdurham.com> wrote:
>
>We've decided to build a re-usable *general purpose* PY2EXE "runtime"
>that can be shared by a number of scripts vs. distributing a monolithic
>EXE for each of our scripts.

It's not clear what the purpose of this is.  You can build several
scripts against the same py2exe backend.
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From Brian.Mingus at Colorado.EDU  Sat Mar 20 00:41:42 2010
From: Brian.Mingus at Colorado.EDU (Brian J Mingus)
Date: Fri, 19 Mar 2010 22:41:42 -0600
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" 
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN 
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
Message-ID: <9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com>

On Fri, Mar 19, 2010 at 10:18 PM, Naeem <kse.listed.co1 at gmail.com> wrote:

> "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY
> FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com       "SEXY
> RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS"
> "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE"
> "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
> --
> http://mail.python.org/mailman/listinfo/python-list
>


Guys, I know it is a lot of work to moderate a large mailing list. But
still, with so many of us surely we can pull it off?
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From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 20 02:23:14 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 20 Mar 2010 06:23:14 GMT
Subject: Writing tests for the Python bug tracker
Message-ID: <4ba469d2$0$27838$c3e8da3@news.astraweb.com>

I have two reported bugs in the bug tracker waiting on tests:

http://bugs.python.org/issue8128
http://bugs.python.org/issue4037

Are there any guidelines for writing tests for the standard library and 
language? I've googled, but found nothing useful: lots of guidelines for 
writing tests, and of course I've read PEP 8, but I'm not sure if there 
are conventions for tests I'm missing.



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 20 02:52:08 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 20 Mar 2010 06:52:08 GMT
Subject: Writing tests for the Python bug tracker
References: <4ba469d2$0$27838$c3e8da3@news.astraweb.com>
Message-ID: <4ba47098$0$27838$c3e8da3@news.astraweb.com>

On Sat, 20 Mar 2010 06:23:14 +0000, Steven D'Aprano wrote:

> Are there any guidelines for writing tests for the standard library and
> language? I've googled, but found nothing useful: lots of guidelines for
> writing tests, and of course I've read PEP 8, but I'm not sure if there
> are conventions for tests I'm missing.

I've found this:

http://docs.python.org/library/test.html

and I've written a small test:

$ cat test_unicode_interpolation.py
# For testing http://bugs.python.org/issue8128

import test.test_support
import unittest

class K(unicode):
    def __str__(self): return "Surprise!"

class UnicodeInterpolationTest(unittest.TestCase):
    def test_interpolation(self):
        self.assertEquals(u'%s' % K('some text'), 'Surprise!')

def test_main():
    test.test_support.run_unittest(UnicodeInterpolationTest)

if __name__ == "__main__":
    test_main()


but when I try running the test, I get an error:

$ python test_unicode_interpolation.py
Options: {'delimiter': None}
str of options.delimiter = None
repr of options.delimiter = None
len of options.delimiter
Traceback (most recent call last):
  File "test_unicode_interpolation.py", line 3, in <module>
    import test.test_support
  File "/home/steve/python/test.py", line 8, in <module>
    print "len of options.delimiter", len(options.delimiter)
TypeError: object of type 'NoneType' has no len()


What am I doing wrong?



(By the way, I'm expecting the unit test above to fail.)




-- 
Steven


From exarkun at twistedmatrix.com  Sat Mar 20 03:07:58 2010
From: exarkun at twistedmatrix.com (exarkun at twistedmatrix.com)
Date: Sat, 20 Mar 2010 07:07:58 -0000
Subject: Writing tests for the Python bug tracker
In-Reply-To: <4ba47098$0$27838$c3e8da3@news.astraweb.com>
References: <4ba469d2$0$27838$c3e8da3@news.astraweb.com>
	<4ba47098$0$27838$c3e8da3@news.astraweb.com>
Message-ID: <20100320070758.2792.893406088.divmod.xquotient.1775@localhost.localdomain>

On 06:52 am, steve at remove-this-cybersource.com.au wrote:
>
>but when I try running the test, I get an error:
>
>$ python test_unicode_interpolation.py
>Options: {'delimiter': None}
>str of options.delimiter = None
>repr of options.delimiter = None
>len of options.delimiter
>Traceback (most recent call last):
>  File "test_unicode_interpolation.py", line 3, in <module>
>    import test.test_support
>  File "/home/steve/python/test.py", line 8, in <module>
>    print "len of options.delimiter", len(options.delimiter)
>TypeError: object of type 'NoneType' has no len()
>
>
>What am I doing wrong?

Take a careful look at the stack being reported.  Then, think of a 
better name than "test" for your file.

Jean-Paul


From greg.ewing at canterbury.ac.nz  Sat Mar 20 03:32:23 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sat, 20 Mar 2010 20:32:23 +1300
Subject: to pass self or not to pass self
In-Reply-To: <b9e5729e-01f6-430d-8748-7cc7d115fc50@g19g2000yqe.googlegroups.com>
References: <e37fbae0-75e5-4ebc-8612-4def481a121c@g11g2000yqe.googlegroups.com>
	<4b9f4984$0$10229$426a74cc@news.free.fr>
	<mailman.860.1268765949.23598.python-list@python.org>
	<4817ed21-61f4-4487-a8d7-399b114284d1@z35g2000yqd.googlegroups.com>
	<mailman.925.1268855759.23598.python-list@python.org>
	<b9e5729e-01f6-430d-8748-7cc7d115fc50@g19g2000yqe.googlegroups.com>
Message-ID: <80jbd2Fhd3U1@mid.individual.net>

Patrick Maupin wrote:

> Actually, I think I overstated my case -- there is some special logic
> for len and built-in objects, I think.

Yes, len() invokes the C-level sq_len slot of the type object,
which for built-in types points directly to the C function
implementing the len() operation for that type. So len() on
a string doesn't involve looking up a __len__ attribute or
creating a bound method at all.

The only reason a __len__ attribute exists at all for
built-in types is to give Python code the illusion that
C-coded and Python-coded classes work the same way. Most
of the time it's never used.

If you try the same test using a method that doesn't have
a corresponding type slot (basically anything without a
double_underscore name) you will probably see a small
improvement.

-- 
Greg


From __peter__ at web.de  Sat Mar 20 04:36:22 2010
From: __peter__ at web.de (Peter Otten)
Date: Sat, 20 Mar 2010 09:36:22 +0100
Subject: logging: local functions ==> loss of lineno
References: <mailman.576.1268256192.23598.python-list@python.org>
	<hnaj9c$i0u$02$1@news.t-online.com>
	<4BA295A1.70207@hellmutweber.de>
	<mailman.972.1268995215.23598.python-list@python.org>
	<hnvqe5$vc$02$1@news.t-online.com>
	<mailman.977.1269006574.23598.python-list@python.org>
Message-ID: <ho21dt$b6v$00$1@news.t-online.com>

Jean-Michel Pichavant wrote:

> You are still accessing the private attribute of the  module logging.

Just reading it is a significantly more conservative approach than setting 
it to an object with an unusual notion of equality ;)

> My previous remark was misleading, in fact there's nothing you can do
> about it.

How about replacing logging._srcfile with fixname(logging.__file__)?

> _srcfile is not meant to be used elsewhere than in the logging module
> itself.

> However, I don't wanna sound like I'm rejecting this solution, 1st the
> OP is satisified with it and since this solution is working, it is still
> more helpful than anyone noticing that you've accessed a private
> attribute (some will successfully argue that python allows to do so).

Yeah, I had hoped that I could get away without drawing the "consenting 
adults" wildcard...
 
> At the very begining of this thread I've provided a complete different
> approach, instead of using the builtin 'filename' and 'lineno' field of
> the logging, use custom fileds with the extra parameter.
> 
> It has also some drawbacks but could be a possible alternative.

Having two filename/lineno sets ist likely to confuse.

Peter


From hawat.thufir at gmail.com  Sat Mar 20 05:17:14 2010
From: hawat.thufir at gmail.com (Thufir)
Date: Sat, 20 Mar 2010 09:17:14 GMT
Subject: google token
Message-ID: <uo0pn.52098$2r7.8254@newsfe05.iad>

I'd like to acquire a token, as below, but from Java:


    def get_token(self,force=False) :
        '''Return a tokey. A token is a special string that is used like 
a session identification, but that expire rather quickly.'''
        if ( force or (self._token == None) ) :
            feedurl = CONST.URI_PREFIXE_API + CONST.API_TOKEN + '?
client=' + CONST.AGENT
            # print feedurl
            self._token = self._web.get(feedurl)
        return self._token


http://pyrfeed.googlecode.com/svn/trunk/lib/GoogleReader/reader.py


Basically, that's just a GET on a particular URL, and the returned string 
is saved as _token?


thanks,

Thufir



From stefan_ml at behnel.de  Sat Mar 20 05:44:39 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Sat, 20 Mar 2010 10:44:39 +0100
Subject: C-API PyObject_Call
In-Reply-To: <7597f6a5-5fe0-4a69-9f9b-f0d96f4499d1@g26g2000yqn.googlegroups.com>
References: <67c5d4da-8d45-41b6-b1b0-b76823844aa1@t20g2000yqe.googlegroups.com>	<mailman.849.1268756405.23598.python-list@python.org>	<3faff03c-6de5-4872-9f68-c129230f6b22@t41g2000yqt.googlegroups.com>	<mailman.858.1268759662.23598.python-list@python.org>	<c322c86d-9eb7-4703-aa23-6552c6de360c@q23g2000yqd.googlegroups.com>	<mailman.883.1268808393.23598.python-list@python.org>	<3592cca0-2a4a-4a19-9e10-d80936e6d200@upsg2000gro.googlegroups.com>	<mailman.943.1268899999.23598.python-list@python.org>	<793e5934-bc1b-4023-aa0e-bf6d956177fd@f8g2000yqn.googlegroups.com>	<mailman.956.1268930626.23598.python-list@python.org>	<fd5b82be-b56c-4024-ad3b-b1a53698cf1f@r27g2000yqn.googlegroups.com>	<mailman.978.1269007923.23598.python-list@python.org>
	<7597f6a5-5fe0-4a69-9f9b-f0d96f4499d1@g26g2000yqn.googlegroups.com>
Message-ID: <ho25e7$hvv$1@dough.gmane.org>

moerchendiser2k3, 20.03.2010 03:01:
> Yes, the user is able to set a file which contains a function that
> does what the user wants.
 > But in a case, I expect a special return value of this function.

Ah, ok, that was the important piece of information that you omitted from 
your previous posts. So what you actually do is call a user provided 
function and you want to report errors back to the user if the function 
does not behave as expected by the (plugin) interface, and not only when it 
raises an exception itself.

You might want to read this:

http://catb.org/~esr/faqs/smart-questions.html


> So, I need to tell him, in which file/line the error occured,
> otherwise he dont know where to look.
>
> Imagine he set 20 files, and all of them have implemented a special
> function. So he wouldnt know where to check for the error.

Well, you can easily get at the module file path and the function name 
through introspection of the function, just as you would in Python. That 
should be enough information to present to the user. I don't see why you 
would want to add the exact line number of the return statement. The inner 
workings of the user function you call are up to the user, after all.

Again, take a look at Cython, where you can do the introspection in Python 
code.

Stefan



From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 20 05:53:33 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 20 Mar 2010 09:53:33 GMT
Subject: Writing tests for the Python bug tracker
References: <4ba469d2$0$27838$c3e8da3@news.astraweb.com>
	<4ba47098$0$27838$c3e8da3@news.astraweb.com>
	<mailman.1002.1269068899.23598.python-list@python.org>
Message-ID: <4ba49b1d$0$27838$c3e8da3@news.astraweb.com>

On Sat, 20 Mar 2010 07:07:58 +0000, exarkun wrote:

>>What am I doing wrong?
> 
> Take a careful look at the stack being reported.  Then, think of a
> better name than "test" for your file.

Doh! *face-palm*

I was shadowing the test package with a long forgotten test module.


-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 20 06:12:40 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 20 Mar 2010 10:12:40 GMT
Subject: google token
References: <uo0pn.52098$2r7.8254@newsfe05.iad>
Message-ID: <4ba49f98$0$27838$c3e8da3@news.astraweb.com>

On Sat, 20 Mar 2010 09:17:14 +0000, Thufir wrote:

> I'd like to acquire a token, as below, but from Java:

Perhaps you should be asking a Java discussion group? This group is for 
discussing Python.


-- 
Steven


From dickinsm at gmail.com  Sat Mar 20 06:56:51 2010
From: dickinsm at gmail.com (Mark Dickinson)
Date: Sat, 20 Mar 2010 03:56:51 -0700 (PDT)
Subject: Writing tests for the Python bug tracker
References: <4ba469d2$0$27838$c3e8da3@news.astraweb.com>
Message-ID: <556adeb4-ac03-4dfe-92a5-814821fd5bfb@z4g2000yqa.googlegroups.com>

On Mar 20, 6:23?am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> I have two reported bugs in the bug tracker waiting on tests:
>
> http://bugs.python.org/issue8128http://bugs.python.org/issue4037
>
> Are there any guidelines for writing tests for the standard library and
> language?

Not that I can think of, beyond those you've already mentioned.  I
mostly just copy the style of existing tests (though there are
definitely some test_*** files that aren't particularly well written).

For quick questions, you might get good answers by asking on the
#python-dev freenode IRC channel:  a good few of the people interested
in testing (esp. Michael Foord, Ezio Melotti) can often be found
there.

--
Mark


From dickinsm at gmail.com  Sat Mar 20 07:00:31 2010
From: dickinsm at gmail.com (Mark Dickinson)
Date: Sat, 20 Mar 2010 04:00:31 -0700 (PDT)
Subject: Writing tests for the Python bug tracker
References: <4ba469d2$0$27838$c3e8da3@news.astraweb.com>
	<4ba47098$0$27838$c3e8da3@news.astraweb.com>
Message-ID: <218770fd-9928-4dfd-9c9c-6fdecbafbaee@k17g2000yqb.googlegroups.com>

On Mar 20, 6:52?am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> I've found this:
>
> http://docs.python.org/library/test.html
>
> and I've written a small test:
>
> $ cat test_unicode_interpolation.py
> # For testinghttp://bugs.python.org/issue8128
>
> import test.test_support
> import unittest
>
> class K(unicode):
> ? ? def __str__(self): return "Surprise!"
>
> class UnicodeInterpolationTest(unittest.TestCase):
> ? ? def test_interpolation(self):
> ? ? ? ? self.assertEquals(u'%s' % K('some text'), 'Surprise!')
>
> def test_main():
> ? ? test.test_support.run_unittest(UnicodeInterpolationTest)
>
> if __name__ == "__main__":
> ? ? test_main()

This looks like a fine start to me.  I have a feeling that the current
fashion is for assertEqual rather than assertEquals, but I might be
wrong.  :)

--
Mark


From chambon.pascal at gmail.com  Sat Mar 20 07:31:47 2010
From: chambon.pascal at gmail.com (Pascal Chambon)
Date: Sat, 20 Mar 2010 12:31:47 +0100
Subject: Precedence of py, pyd, so, egg, and folder modules/packages when
	importing
Message-ID: <4BA4B223.90207@gmail.com>

Hello,

I've run into a slight issue when turning my package hierarchy into a 
parallel hierarchy of compiled cython extensions. Fue to the compilation 
process, pure python and C modules must have the basename, and they're 
located in the same folders.

Is there any way for me to ensure that, if both modules sets are 
installed by an user, the compiled, faster module will ALWAYS be 
imported instead of the pure python one ? Or am I forced to remove 
pure-python sources when cython ones must be used ?

More generally, is there any certainty about the precedence of the misc. 
module types, when several of them are in the same path ? I have found 
nothing about it online.

Thanks for the attention,
regards,
Pascal


From news1234 at free.fr  Sat Mar 20 08:16:08 2010
From: news1234 at free.fr (News123)
Date: Sat, 20 Mar 2010 13:16:08 +0100
Subject: accessing variable of the __main__ module
Message-ID: <4ba4bc88$0$29961$426a74cc@news.free.fr>

Hi,


I wondered about the best way, that a  module's function could determine
the existance and value of variables in the __main__ module.


What I came up with is:
########### main.py ##########
import mod
A = 4
if __name__ == "__main__": mod.f()
########### mod.py ##########
def f():
    try:
        from __main__ import A
    except ImportError as e:
        A = "does not exist"
    print "__main__.A" ,A

Is there anything better / more pythonic?

Thanks in advance and bye


N


From python at bdurham.com  Sat Mar 20 08:46:49 2010
From: python at bdurham.com (python at bdurham.com)
Date: Sat, 20 Mar 2010 08:46:49 -0400
Subject: (updated) Choosing a collection of common modules/packages for a 
	general purpose    reusable PY2EXE runtime
In-Reply-To: <ho1jia$2pb$1@panix3.panix.com>
References: <1268143741.31835.1363885481@webmail.messagingengine.com><mailman.491.1268144871.23598.python-list@python.org>
	<ho1jia$2pb$1@panix3.panix.com>
Message-ID: <1269089209.14921.1365809185@webmail.messagingengine.com>

Aahz,

>> We've decided to build a re-usable *general purpose* PY2EXE "runtime"
>> that can be shared by a number of scripts vs. distributing a monolithic
>> EXE for each of our scripts.

> It's not clear what the purpose of this is. You can build several 
> scripts against the same py2exe backend.

Yes you can, but with our technique we only build and distribute our
py2exe backend *once*.

Our goal was to build a custom Python runtime that we could build and
deploy once and then augment with the many scripts we distribute and
update. By including the full Python standard library (minus non-Windows
and certain deprecated modules) and a few additional 3rd party
modules/packages (win32, wmi, jsonpickle, etc) our script distribution
has become significantly easier, faster and more robust - especially for
scripts that may make dynamic module imports missed by py2exe. Script
updates are incredibly fast because our clients only download the
scripts themselves (packaged as standalone zip files). Not that disk
space is a concern any more, but our client footprint is significantly
smaller without every script being a single file exe.

I recognize that this technique might not work for everyone, but it has
worked out extremely well for us.

Malcolm



----- Original message -----
From: "Aahz" <aahz at pythoncraft.com>
To: python-list at python.org
Date: 19 Mar 2010 21:39:38 -0700
Subject: Re: (updated) Choosing a collection of common modules/packages
for a   general purpose    reusable PY2EXE runtime

In article <mailman.491.1268144871.23598.python-list at python.org>,
 <python at bdurham.com> wrote:
>
>We've decided to build a re-usable *general purpose* PY2EXE "runtime"
>that can be shared by a number of scripts vs. distributing a monolithic
>EXE for each of our scripts.

It's not clear what the purpose of this is.  You can build several
scripts against the same py2exe backend.
-- 
Aahz (aahz at pythoncraft.com)           <*>        
http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and
promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer
-- 
http://mail.python.org/mailman/listinfo/python-list



From alfps at start.no  Sat Mar 20 08:47:41 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Sat, 20 Mar 2010 13:47:41 +0100
Subject: accessing variable of the __main__ module
In-Reply-To: <4ba4bc88$0$29961$426a74cc@news.free.fr>
References: <4ba4bc88$0$29961$426a74cc@news.free.fr>
Message-ID: <ho2g5h$jfo$1@news.eternal-september.org>

* News123:
> 
> I wondered about the best way, that a  module's function could determine
> the existance and value of variables in the __main__ module.
> 
> 
> What I came up with is:
> ########### main.py ##########
> import mod
> A = 4
> if __name__ == "__main__": mod.f()
> ########### mod.py ##########
> def f():
>     try:
>         from __main__ import A
>     except ImportError as e:
>         A = "does not exist"
>     print "__main__.A" ,A
> 
> Is there anything better / more pythonic?

I don't know if this is what you're after, because it's design level instead of 
technical-Python level. But consider the knowledge distribution above. I see it 
as like a doctor (main program) telling a nurse (mod.f) to please do something 
for which the nurse would require some ImportantFact, which the good doctor 
absent-mindedly forgets to tell the nurse. Trying to do as told the nurse 
discovers that she needs the ImportantFact, and knowing that it might be 
available in one of the doctor's files she breaks into his office, finds the PC 
up and running with the doctor logged in, hurray!, and starts looking...

I think the doctor should just give the nurse the ImportantFact right away, not 
be so absent-minded and unavailable for query later.

And I think that if the nurse isn't told the ImportantFact and discovers that 
she needs it to do what she's told, then the proper thing to do is not to break 
into the doctor's office and go browsing in his files to possibly find what she 
needs. For example, she might instead raise an exception. Don't know how they do 
that in hospitals, though.


Cheers & hth.,

- Alf


From luismgz at gmail.com  Sat Mar 20 08:51:25 2010
From: luismgz at gmail.com (=?ISO-8859-1?Q?Luis_M=2E_Gonz=E1lez?=)
Date: Sat, 20 Mar 2010 05:51:25 -0700 (PDT)
Subject: Best Way to extract Numbers from String
References: <ded7c9a6-e4b1-46f7-97ca-fd66708f7443@g1g2000pre.googlegroups.com>
Message-ID: <c0f554a5-2407-40ff-9828-50e56b223d43@r1g2000yqj.googlegroups.com>

On Mar 20, 12:04?am, Jimbo <nill... at yahoo.com> wrote:
> Hello
>
> I am trying to grab some numbers from a string containing HTML text.
> Can you suggest any good functions that I could use to do this? What
> would be the easiest way to extract the following numbers from this
> string...
>
> My String has this layout & I have commented what I want to grab:
> [CODE] """</th>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="last">43.200 </td>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="change indicator" nowrap>0.040 </td>
>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?<td>43.150 </td> #
> I need to grab this number only
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td>43.200 </td>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?<td>43.130 </td> #
> I need to grab this number only
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td>43.290 </td> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td>43.100 </td> # I need to
> grab this number only
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td>7,450,447 </td>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="middle"><a
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? href="/asx/markets/optionPrices.do?
> by=underlyingCode&underlyingCode=BHP&expiryDate=&optionType=">Options</
> a></td>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="middle"><a
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? href="/asx/markets/warrantPrices.do?
> by=underlyingAsxCode&underlyingCode=BHP">Warrants & Structured
> Products</a></td>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="middle"><a
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? href="/asx/markets/cfdPrices.do?
> by=underlyingAsxCode&underlyingCode=BHP">CFDs</a></td>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="middle"><a href="http://hfgapps.hubb.com/asxtools/
> Charts.aspx?
> TimeFrame=D6&compare=comp_index&indicies=XJO&pma1=20&pma2=20&asxCode=BHP">< img
> src="/images/chart.gif" border="0" height="15" width="15"></a>
> </td>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td><a href="/research/announcements/status_notes.htm#XD">XD</a>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? </td>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td><a href="/asx/statistics/announcements.do?
> by=asxCode&asxCode=BHP&timeframe=D&period=W">Recent</a>
> </td>
> ? ? ? ? ? ? ? ? ? ? ? ? </tr>"""[/CODE]


You should use BeautifulSoup or perhaps regular expressions.
Or if you are not very smart, lik me, just try a brute force approach:

>>> for i in s.split('>'):
	for e in i.split():
		if '.' in e and e[0].isdigit():
			print (e)


43.200
0.040
43.150
43.200
43.130
43.290
43.100
>>>


From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 20 09:05:41 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 20 Mar 2010 13:05:41 GMT
Subject: accessing variable of the __main__ module
References: <4ba4bc88$0$29961$426a74cc@news.free.fr>
Message-ID: <4ba4c824$0$27838$c3e8da3@news.astraweb.com>

On Sat, 20 Mar 2010 13:16:08 +0100, News123 wrote:

> Hi,
> 
> 
> I wondered about the best way, that a  module's function could determine
> the existance and value of variables in the __main__ module.
> 
> 
> What I came up with is:
> ########### main.py ##########
> import mod
> A = 4
> if __name__ == "__main__": mod.f()
> ########### mod.py ##########
> def f():
>     try:
>         from __main__ import A
>     except ImportError as e:
>         A = "does not exist"
>     print "__main__.A" ,A
> 
> Is there anything better / more pythonic?


First problem:

You try to import from "__main__", but the other module is called "main". 
__main__ is a special name, which Python understands as meaning "this 
module that you are in now". For example:

$ cat test_main.py
x = "something special"
import __main__  # magic alias for this module
print __main__.x

$ python test_main.py
something special

So inside "mod.py", the line "from __main__ import A" tries to import A 
from mod.py, not from main.py. You need to say "from main import A" 
instead.

But if you do this, it creates a second problem: you have a circular 
import, which is generally considered a Bad Thing. The problem is that:

(1) module main tries to import module mod
(2) module mod tries to import module main
(3) but main is still waiting for mod to be imported

Now, in your case you escape that trap, because the import is inside a 
function, so it doesn't occur until you call the function. But it is 
still considered poor practice: it is best to avoid circular imports 
unless you really, really need them.


The question is, why does module mod.py care what is happening in 
main.py? It is better for mod.py to be self-contained, and not care about 
main.py at all. If it needs A, let the caller pass A to it:

########### main.py ##########
import mod
A = 4
if __name__ == "__main__":
    mod.f(__name__, A)

########### mod.py ##########
def f(caller, A):
    print "%s.A: %s" % (caller, A)



-- 
Steven


From news1234 at free.fr  Sat Mar 20 09:32:03 2010
From: news1234 at free.fr (News123)
Date: Sat, 20 Mar 2010 14:32:03 +0100
Subject: accessing variable of the __main__ module
In-Reply-To: <4ba4c824$0$27838$c3e8da3@news.astraweb.com>
References: <4ba4bc88$0$29961$426a74cc@news.free.fr>
	<4ba4c824$0$27838$c3e8da3@news.astraweb.com>
Message-ID: <4ba4ce53$0$28677$426a34cc@news.free.fr>

Hi Steven,








Steven D'Aprano wrote:
> On Sat, 20 Mar 2010 13:16:08 +0100, News123 wrote:
> 
>> Hi,
>>
>>
>> I wondered about the best way, that a  module's function could determine
>> the existance and value of variables in the __main__ module.
>>
>>
>> What I came up with is:
>> ########### main.py ##########
>> import mod
>> A = 4
>> if __name__ == "__main__": mod.f()
>> ########### mod.py ##########
>> def f():
>>     try:
>>         from __main__ import A
>>     except ImportError as e:
>>         A = "does not exist"
>>     print "__main__.A" ,A
>>
>> Is there anything better / more pythonic?
> 
> 
> First problem:
> 
> You try to import from "__main__", but the other module is called "main". 
> __main__ is a special name, which Python understands as meaning "this 
> module that you are in now". For example:
My choice of names was perhaps not very smart.
I could have called main.py also mytoplevel.py


> 
> $ cat test_main.py
> x = "something special"
> import __main__  # magic alias for this module
> print __main__.x
> 
> $ python test_main.py
> something special
> 
> So inside "mod.py", the line "from __main__ import A" tries to import A 
> from mod.py, not from main.py. You need to say "from main import A" 
> instead.
> 
I think you're wrong, my above code seems to work.
__main__  refers not to the current module, but to the urrent
'top-level-module'
so
from __main__ import A tries to import from the top level module which
is in my case main.py.


> But if you do this, it creates a second problem: you have a circular 
> import, which is generally considered a Bad Thing. The problem is that:
> 
> (1) module main tries to import module mod
> (2) module mod tries to import module main
> (3) but main is still waiting for mod to be imported
> 
> Now, in your case you escape that trap, because the import is inside a 
> function, so it doesn't occur until you call the function. But it is 
> still considered poor practice: it is best to avoid circular imports 
> unless you really, really need them.
> 
> 
> The question is, why does module mod.py care what is happening in 
> main.py? It is better for mod.py to be self-contained, and not care about 
> main.py at all. If it needs A, let the caller pass A to it:


The reason is pure lazyness.
I would like to 'try' something quickly.

I have a module used by many different python programs.

In case the __main__  module contains a certain object I'd like to
extract information from this object if not not.

This is for debug, not for 'production'.

I'd prefer to change only one file and not many.


> 
> ########### main.py ##########
> import mod
> A = 4
> if __name__ == "__main__":
>     mod.f(__name__, A)
> 
> ########### mod.py ##########
> def f(caller, A):
>     print "%s.A: %s" % (caller, A)
> 
> 
> 

N


From news1234 at free.fr  Sat Mar 20 09:38:43 2010
From: news1234 at free.fr (News123)
Date: Sat, 20 Mar 2010 14:38:43 +0100
Subject: why is there now execption for windows? trying to listen twice to
	the same port
Message-ID: <4ba4cfe3$0$7060$426a74cc@news.free.fr>

I'm having a small multiprocessing manager:

# ##########################
import socket,sys
from multiprocessing.managers import BaseManager

mngr = BaseManager(address=('127.0.0.1',8089),authkey='verysecret')
try:
    srvr = mngr.get_server()
except socket.error as e:
    print "probably address already in use"
    sys.exit()
print "serving"
srvr.serve_forever()


Under linux this script can only be run once.
The second call will raise an exception, as the previous program is
already listening to pot 8089.


Under Windows however the program can be started twice.
and will print twice "serving". This surprises me

Howver only one of them will successfully listen and respond to
connections, but I don't get an exception.

Is this to be expected?

I'd like to be sure, that the manager is only started once and that it
can be started anytime it's not up.


N


From gatoygata2 at gmail.com  Sat Mar 20 09:54:53 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Sat, 20 Mar 2010 06:54:53 -0700 (PDT)
Subject: How User-defined method objects are created?
Message-ID: <cf27c64f-ea5a-428c-898c-88d7eb748422@q23g2000yqd.googlegroups.com>

I'm trying to understand the description of method object creation in
the python 2.6 language reference (3.2. The standard type hierarchy)
with little success. The points knocking me are:

"User-defined method objects may be created when getting an attribute
of a class (perhaps via an instance of that class), if that attribute
is a user-defined function object, an unbound user-defined method
object, or a class method object. When the attribute is a user-defined
method object, a new method object is only created if the class from
which it is being retrieved is the same as, or a derived class of, the
class stored in the original method object; otherwise, the original
method object is used as it is."

It is a bit of a tongue-twister for me. What the last sentence means?
Please, I beg for a simple example of the different objects (user
defined function, user defined method, class method) refered.
Are maybe the refered objects exemplified by :

#python 3.1
class Klass():

	def met(self):
		print('method')

       def func():
		print('function')

       @classmethod
	def kmet(klass):
		print('classmethod')

or it is talking about another thing?
What is the difference with python 3 where there is no mention to the
unbound user-defined method object (same section in python 3 language
reference):

"User-defined method objects may be created when getting an attribute
of a class (perhaps via an instance of that class), if that attribute
is a user-defined function object or a class method object."

I'm trying to learn, however the task is revealing as an enormous
undertaking :-)

JA




From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 20 10:04:41 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 20 Mar 2010 14:04:41 GMT
Subject: accessing variable of the __main__ module
References: <4ba4bc88$0$29961$426a74cc@news.free.fr>
	<4ba4c824$0$27838$c3e8da3@news.astraweb.com>
	<4ba4ce53$0$28677$426a34cc@news.free.fr>
Message-ID: <4ba4d5f9$0$27838$c3e8da3@news.astraweb.com>

On Sat, 20 Mar 2010 14:32:03 +0100, News123 wrote:

>> You try to import from "__main__", but the other module is called
>> "main". __main__ is a special name, which Python understands as meaning
>> "this module that you are in now". For example:
>
> My choice of names was perhaps not very smart. I could have called
> main.py also mytoplevel.py
[...]
> I think you're wrong, my above code seems to work. __main__  refers not
> to the current module, but to the urrent 'top-level-module'
> so
> from __main__ import A tries to import from the top level module which
> is in my case main.py.

Hmmm... it looks like you are correct and I made a mistake.

This isn't something that the documentation is clear about, but here are 
a set of test files:


$ cat A.py
import __main__
import B
print __main__, B, B.__main__

$ cat B.py
import __main__

$ python A.py
<module '__main__' from 'A.py'> <module 'B' from '/home/steve/python/
B.pyc'> <module '__main__' from 'A.py'>


Here is the documentation:

http://docs.python.org/library/__main__.html

which is pretty sparse.



-- 
Steven


From irmen.NOSPAM at xs4all.nl  Sat Mar 20 10:17:50 2010
From: irmen.NOSPAM at xs4all.nl (Irmen de Jong)
Date: Sat, 20 Mar 2010 15:17:50 +0100
Subject: why is there now execption for windows? trying to listen twice
	to the same port
In-Reply-To: <4ba4cfe3$0$7060$426a74cc@news.free.fr>
References: <4ba4cfe3$0$7060$426a74cc@news.free.fr>
Message-ID: <4ba4d910$0$22939$e4fe514c@news.xs4all.nl>

On 20-3-2010 14:38, News123 wrote:
> I'm having a small multiprocessing manager:
>
> # ##########################
> import socket,sys
> from multiprocessing.managers import BaseManager
>
> mngr = BaseManager(address=('127.0.0.1',8089),authkey='verysecret')
> try:
>      srvr = mngr.get_server()
> except socket.error as e:
>      print "probably address already in use"
>      sys.exit()
> print "serving"
> srvr.serve_forever()
>
>
> Under linux this script can only be run once.
> The second call will raise an exception, as the previous program is
> already listening to pot 8089.
>
>
> Under Windows however the program can be started twice.
> and will print twice "serving". This surprises me


My guess is that somewhere in the multiprocessing package the SO_REUSEADDR option is 
used on the socket. And that option has different semantics on Windows than it has on 
other operating systems. At least one of them being the possibility of multiple bindings 
on the same port without getting an error.
See http://bugs.python.org/issue2550.
Also see the code comments to bind_port in Lib/test/test_support.py, that suggests using 
SO_EXCLUSIVEADDRUSE instead under Windows, but that is not much use to you unless you 
monkeypatch the multiprocessing package code.

Hope this helps
-irmen



From davea at ieee.org  Sat Mar 20 10:50:17 2010
From: davea at ieee.org (Dave Angel)
Date: Sat, 20 Mar 2010 09:50:17 -0500
Subject: accessing variable of the __main__ module
In-Reply-To: <4ba4ce53$0$28677$426a34cc@news.free.fr>
References: <4ba4bc88$0$29961$426a74cc@news.free.fr>	<4ba4c824$0$27838$c3e8da3@news.astraweb.com>
	<4ba4ce53$0$28677$426a34cc@news.free.fr>
Message-ID: <4BA4E0A9.3050804@ieee.org>

News123 wrote:
>
> Steven D'Aprano wrote:
>   
>> <snip>
>> Now, in your case you escape that trap, because the import is inside a 
>> function, so it doesn't occur until you call the function. But it is 
>> still considered poor practice: it is best to avoid circular imports 
>> unless you really, really need them.
>>
>>
>> The question is, why does module mod.py care what is happening in 
>> main.py? It is better for mod.py to be self-contained, and not care about 
>> main.py at all. If it needs A, let the caller pass A to it:
>>     
>
>
> The reason is pure lazyness.
> I would like to 'try' something quickly.
>
> I have a module used by many different python programs.
>
> In case the __main__  module contains a certain object I'd like to
> extract information from this object if not not.
>
> This is for debug, not for 'production'.
>
> I'd prefer to change only one file and not many.
>
>
>   
First, the practical response:  yes, it'll work, and if this is really 
for debug, it's fine.   However, realize that many times "debug things" 
make it into the wild.

Any time recursion of imports occurs, it's a sign of trouble.  And doing 
it right isn't usually much harder than studying the hazards of the 
recursion.

In the particular case you're doing, I think there are at least three 
better solutions:

1) Pass A as an argument to a function call, for example   f(A).
2) Put A into a separate module that both main.py and mod.py import
3) Explicitly add A to mod.py's global space.     mod.A = A   written in 
main.py,  before calling the function mod.x().

HTH
DaveA



From news1234 at free.fr  Sat Mar 20 10:52:05 2010
From: news1234 at free.fr (News123)
Date: Sat, 20 Mar 2010 15:52:05 +0100
Subject: why is there now execption for windows? trying to listen twice
	to the same port
In-Reply-To: <4ba4d910$0$22939$e4fe514c@news.xs4all.nl>
References: <4ba4cfe3$0$7060$426a74cc@news.free.fr>
	<4ba4d910$0$22939$e4fe514c@news.xs4all.nl>
Message-ID: <4ba4e115$0$18400$426a74cc@news.free.fr>

Hi Irmen,


Irmen de Jong wrote:
> On 20-3-2010 14:38, News123 wrote:
>> I'm having a small multiprocessing manager:
>>
>> # ##########################
>> import socket,sys
>> from multiprocessing.managers import BaseManager
>>
>> mngr = BaseManager(address=('127.0.0.1',8089),authkey='verysecret')
>> try:
>>      srvr = mngr.get_server()
>> except socket.error as e:
>>      print "probably address already in use"
>>      sys.exit()
>> print "serving"
>> srvr.serve_forever()
>>
>> Under Windows however the program can be started twice.
>> and will print twice "serving". This surprises me
> 
> 
> My guess is that somewhere in the multiprocessing package the
> SO_REUSEADDR option is used on the socket. And that option has different
> semantics on Windows than it has on other operating systems. At least
> one of them being the possibility of multiple bindings on the same port
> without getting an error.
> See http://bugs.python.org/issue2550.
> Also see the code comments to bind_port in Lib/test/test_support.py,
> that suggests using SO_EXCLUSIVEADDRUSE instead under Windows, but that
> is not much use to you unless you monkeypatch the multiprocessing
> package code.
> 

Yes this might be.


Then I think, that I should report it either as bug / enhancement
request. However I am not at all aware of the issue reporting process
concerning python. (special site / module developer, PEP . . . )

For the short term:
I wonder now how to solve my problem that only one manager is started
and the second one should just aborts.

Some days ago I started a discussion in the thread
"how to start a python script only once".
I hoped, that the listening socket of the manager would just take care
of the issue.

N









From duncan.booth at invalid.invalid  Sat Mar 20 12:24:37 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 20 Mar 2010 16:24:37 GMT
Subject: How User-defined method objects are created?
References: <cf27c64f-ea5a-428c-898c-88d7eb748422@q23g2000yqd.googlegroups.com>
Message-ID: <Xns9D41A6EC8DEA0duncanbooth@127.0.0.1>

Joaquin Abian <gatoygata2 at gmail.com> wrote:

> "User-defined method objects may be created when getting an attribute
> of a class (perhaps via an instance of that class), if that attribute
> is a user-defined function object, an unbound user-defined method
> object, or a class method object. When the attribute is a user-defined
> method object, a new method object is only created if the class from
> which it is being retrieved is the same as, or a derived class of, the
> class stored in the original method object; otherwise, the original
> method object is used as it is."
> 
> It is a bit of a tongue-twister for me. What the last sentence means?
> Please, I beg for a simple example of the different objects (user
> defined function, user defined method, class method) refered.

>>> class A(object):
	def foo(self): pass

	
>>> class B(object):
	def bar(self): pass

	
>>> B.baz = B.bar
>>> B.foo = A.foo
>>> instance = B()
>>> B.foo
<unbound method A.foo>
>>> B.bar
<unbound method B.bar>
>>> B.baz
<unbound method B.bar>
>>> instance.foo
<unbound method A.foo>
>>> instance.bar
<bound method B.bar of <__main__.B object at 0x00000000036B7780>>
>>> instance.baz
<bound method B.bar of <__main__.B object at 0x00000000036B7780>>
>>> B.__dict__['bar']
<function bar at 0x00000000036C5048>
>>> B.__dict__['baz']
<unbound method B.bar>
>>> B.__dict__['foo']
<unbound method A.foo>

So, we have a function 'bar' stored in B's dict. When you access the 
function as the attribute B.bar Python 2.x will create an unbound method 
object. When you access the function through instance.bar Python creates a 
bound method. Note that every time you access instance.bar it creates 
another new method object:

>>> instance.bar is instance.bar
False

B.baz is an unbound method stored directly in B's dict. When you access 
instance.baz you get a new bound method object (it's at the same memory 
location as the previous one but that's only because the lifetimes don't 
overlap). Somewhat suprisingly the same also happens if you access B.baz: 
it creates a new unbound method from the existing unbound method:

>>> B.bar is B.__dict__['bar']
False

B.foo is an unbound method stored directly in B's dict, but it is a method 
of an A and B doesn't subclass A, so when you try to access B.foo you just 
get the stored unbound method it isn't converted into a new object.


From tjreedy at udel.edu  Sat Mar 20 12:33:01 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 20 Mar 2010 12:33:01 -0400
Subject: why is there now execption for windows? trying to listen twice
	to the same port
In-Reply-To: <4ba4e115$0$18400$426a74cc@news.free.fr>
References: <4ba4cfe3$0$7060$426a74cc@news.free.fr>	<4ba4d910$0$22939$e4fe514c@news.xs4all.nl>
	<4ba4e115$0$18400$426a74cc@news.free.fr>
Message-ID: <ho2tbr$oar$2@dough.gmane.org>

On 3/20/2010 10:52 AM, News123 wrote:
> Hi Irmen,
>
>
> Irmen de Jong wrote:
>> On 20-3-2010 14:38, News123 wrote:
>>> I'm having a small multiprocessing manager:
>>>
>>> # ##########################
>>> import socket,sys
>>> from multiprocessing.managers import BaseManager
>>>
>>> mngr = BaseManager(address=('127.0.0.1',8089),authkey='verysecret')
>>> try:
>>>       srvr = mngr.get_server()
>>> except socket.error as e:
>>>       print "probably address already in use"
>>>       sys.exit()
>>> print "serving"
>>> srvr.serve_forever()
>>>
>>> Under Windows however the program can be started twice.
>>> and will print twice "serving". This surprises me
>>
>>
>> My guess is that somewhere in the multiprocessing package the
>> SO_REUSEADDR option is used on the socket. And that option has different
>> semantics on Windows than it has on other operating systems. At least
>> one of them being the possibility of multiple bindings on the same port
>> without getting an error.
>> See http://bugs.python.org/issue2550.
>> Also see the code comments to bind_port in Lib/test/test_support.py,
>> that suggests using SO_EXCLUSIVEADDRUSE instead under Windows, but that
>> is not much use to you unless you monkeypatch the multiprocessing
>> package code.
>>
>
> Yes this might be.
>
>
> Then I think, that I should report it either as bug / enhancement

I agree. I would guess that the difference is not intentional.

> request. However I am not at all aware of the issue reporting process
> concerning python. (special site / module developer, PEP . . . )

bugs.python.org

Terry Jan Reedy



From tjreedy at udel.edu  Sat Mar 20 12:39:44 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 20 Mar 2010 12:39:44 -0400
Subject: How User-defined method objects are created?
In-Reply-To: <cf27c64f-ea5a-428c-898c-88d7eb748422@q23g2000yqd.googlegroups.com>
References: <cf27c64f-ea5a-428c-898c-88d7eb748422@q23g2000yqd.googlegroups.com>
Message-ID: <ho2tof$qd8$1@dough.gmane.org>

On 3/20/2010 9:54 AM, Joaquin Abian wrote:
> I'm trying to understand the description of method object creation in
> the python 2.6 language reference (3.2. The standard type hierarchy)
> with little success. The points knocking me are:
>
> "User-defined method objects may be created when getting an attribute
> of a class (perhaps via an instance of that class), if that attribute
> is a user-defined function object, an unbound user-defined method
> object, or a class method object. When the attribute is a user-defined
> method object, a new method object is only created if the class from
> which it is being retrieved is the same as, or a derived class of, the
> class stored in the original method object; otherwise, the original
> method object is used as it is."
>
> It is a bit of a tongue-twister for me. What the last sentence means?
> Please, I beg for a simple example of the different objects (user
> defined function, user defined method, class method) refered.
> Are maybe the refered objects exemplified by :
>
> #python 3.1
> class Klass():
>
> 	def met(self):
> 		print('method')
>
>         def func():
> 		print('function')
>
>         @classmethod
> 	def kmet(klass):
> 		print('classmethod')
>
> or it is talking about another thing?
> What is the difference with python 3 where there is no mention to the
> unbound user-defined method object (same section in python 3 language
> reference):

Python3 does not have unbound method objects. Klass.met above is just a 
function.l

> "User-defined method objects may be created when getting an attribute
> of a class (perhaps via an instance of that class), if that attribute
> is a user-defined function object or a class method object."
>
> I'm trying to learn, however the task is revealing as an enormous
> undertaking :-)

One can successfully use the language in the normal way without 
understanding every detail of every oddball corner case. Recent 2.x is 
complicated by duplication (two user object systems) and 
back-compatibility constraints. Most new users do not need to bother 
with obsolete complications.

Terry Jan Reedy



From waugustynski at gmail.com  Sat Mar 20 13:00:47 2010
From: waugustynski at gmail.com (waugust)
Date: Sat, 20 Mar 2010 10:00:47 -0700 (PDT)
Subject: Ubuntu install problems
Message-ID: <99adedf9-e02d-4c71-983b-8901b9fa6791@w39g2000prd.googlegroups.com>

I have 2.5 (for GAE), 2.6 (Ubuntu default), and 3.1 installed.
Whenever I apt-get install anything It ends with a series of python
(dependency?) errors.  Anybody got any idea?
> aptget libgcj-common
Reading package lists...
Done
Building dependency
tree
Reading state information...
Done
libgcj-common is already the newest
version.
0 upgraded, 0 newly installed, 0 to remove and 6 not
upgraded.
26 not fully installed or
removed.
After this operation, 0B of additional disk space will be
used.
Setting up libgcj-common
(1:4.4.1-1ubuntu2) ...
Compiling /usr/lib/python3.1/dist-packages/
aotcompile.py ...
  File "/usr/lib/python3.1/dist-packages/aotcompile.py", line
115
    raise Error, "nothing to
do"
 
^
SyntaxError: invalid
syntax

Compiling /usr/lib/python3.1/dist-packages/classfile.py ...
  File "/usr/lib/python3.1/dist-packages/classfile.py", line 30
    raise TypeError, type(arg)
                   ^
SyntaxError: invalid syntax

pycentral: pycentral pkginstall: error byte-compiling files (2)
pycentral pkginstall: error byte-compiling files (2)
dpkg: error processing libgcj-common (--configure):
 subprocess installed post-installation script returned error exit
status 1
dpkg: dependency problems prevent configuration of
libgcj10:
 libgcj10 depends on libgcj-common (>= 1:4.1.1-21);
however:
  Package libgcj-common is not configured
yet.
dpkg: error processing libgcj10 (--
configure):
 dependency problems - leaving
unconfigured
dpkg: dependency problems prevent configuration of libgcj-bc:

It snowballs down from there for:

No apport report written because MaxReports is reached already
                                                              Errors
were encountered while processing:
 libgcj-common
 libgcj10
 libgcj-bc
 ant-gcj
 ant-optional-gcj
 python-transaction
 python-zconfig
 python-zdaemon
 python-zope.exceptions
 python-zope.testing
 python-zope.proxy
 python-zodb
 python-zope.component
 gaphor
 gcj-4.4-jre-lib
 python-speechd
 python-pyatspi
 gnome-orca
 python-configglue
 python-telepathy
 python-ubuntuone-storageprotocol
 python-ubuntuone-client
 telepathy-butterfly
 ubuntuone-client
 ubuntuone-client-gnome
 python-zope.hookable
E: Sub-process /usr/bin/dpkg returned an error code (1)


From news1234 at free.fr  Sat Mar 20 13:11:25 2010
From: news1234 at free.fr (News123)
Date: Sat, 20 Mar 2010 18:11:25 +0100
Subject: why is there now execption for windows? trying to listen twice
	to the same port
In-Reply-To: <mailman.1008.1269102907.23598.python-list@python.org>
References: <4ba4cfe3$0$7060$426a74cc@news.free.fr>	<4ba4d910$0$22939$e4fe514c@news.xs4all.nl>	<4ba4e115$0$18400$426a74cc@news.free.fr>
	<mailman.1008.1269102907.23598.python-list@python.org>
Message-ID: <4ba501bd$0$7193$426a74cc@news.free.fr>

Terry Reedy wrote:
> On 3/20/2010 10:52 AM, News123 wrote:
>> Hi Irmen,
>>
>>
>> Irmen de Jong wrote:
>>> On 20-3-2010 14:38, News123 wrote:
>>>> I'm having a small multiprocessing manager:
>>>>
>>>> # ##########################
>>>> import socket,sys
>>>> from multiprocessing.managers import BaseManager
>>>>
>>>> mngr = BaseManager(address=('127.0.0.1',8089),authkey='verysecret')
>>>> try:
>>>>       srvr = mngr.get_server()
>>>> except socket.error as e:
>>>>       print "probably address already in use"
>>>>       sys.exit()
>>>> print "serving"
>>>> srvr.serve_forever()
>>>>
>>>> Under Windows however the program can be started twice.
>>>> and will print twice "serving". This surprises me
>>>
. . .
>>
>> Then I think, that I should report it either as bug / enhancement
> 
> I agree. I would guess that the difference is not intentional.
> 
>> request. However I am not at all aware of the issue reporting process
>> concerning python. (special site / module developer, PEP . . . )
> 
> bugs.python.org
> 
Thanks,


I created an account and submitted the issue


N


From benjamin.kaplan at case.edu  Sat Mar 20 13:15:16 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sat, 20 Mar 2010 13:15:16 -0400
Subject: Ubuntu install problems
In-Reply-To: <99adedf9-e02d-4c71-983b-8901b9fa6791@w39g2000prd.googlegroups.com>
References: <99adedf9-e02d-4c71-983b-8901b9fa6791@w39g2000prd.googlegroups.com>
Message-ID: <ec96e1391003201015o140bf70mc8552605cc3e3834@mail.gmail.com>

On Sat, Mar 20, 2010 at 1:00 PM, waugust <waugustynski at gmail.com> wrote:

> I have 2.5 (for GAE), 2.6 (Ubuntu default), and 3.1 installed.
> Whenever I apt-get install anything It ends with a series of python
> (dependency?) errors.  Anybody got any idea?
> > aptget libgcj-common
> Reading package lists...
> Done
> Building dependency
> tree
> Reading state information...
> Done
> libgcj-common is already the newest
> version.
> 0 upgraded, 0 newly installed, 0 to remove and 6 not
> upgraded.
> 26 not fully installed or
> removed.
> After this operation, 0B of additional disk space will be
> used.
> Setting up libgcj-common
> (1:4.4.1-1ubuntu2) ...
> Compiling /usr/lib/python3.1/dist-packages/
> aotcompile.py ...
>  File "/usr/lib/python3.1/dist-packages/aotcompile.py", line
> 115
>    raise Error, "nothing to
> do"
>
> ^
> SyntaxError: invalid
> syntax
>
> Compiling /usr/lib/python3.1/dist-packages/classfile.py ...
>  File "/usr/lib/python3.1/dist-packages/classfile.py", line 30
>    raise TypeError, type(arg)
>                   ^
> SyntaxError: invalid syntax
>
>
Did you set /usr/bin/python to Python 3.1? It needs to stay as the system
default Python (in this case 2.6) or else lots of stuff breaks. You're
getting those syntax errors because of the difference between Python 2.x
(which the scripts were written for) and Python 3.x (which is being run)
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From aahz at pythoncraft.com  Sat Mar 20 13:24:45 2010
From: aahz at pythoncraft.com (Aahz)
Date: 20 Mar 2010 10:24:45 -0700
Subject: Reverse engineering CRC?
References: <7vj7fdFnnjU1@mid.individual.net> <kz88du.hk0@spenarnc.xs4all.nl>
	<4B9E0C1F.9020003@canterbury.ac.nz>
Message-ID: <ho30ct$2bo$1@panix3.panix.com>

In article <4B9E0C1F.9020003 at canterbury.ac.nz>,
Gregory Ewing  <greg.ewing at canterbury.ac.nz> wrote:
>
>It turned out to be a very standard CRC algorithm, complicated
>by the presence of a few extra bytes of data being checked that
>didn't appear explicitly in the file anywhere.
>
>In the process I developed some very general techniques for
>solving this kind of problem, which I've written about here
>if anyone's interested:
>
>http://www.cosc.canterbury.ac.nz/greg.ewing/essays/CRC-Reverse-Engineering.html

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

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 20 13:25:03 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 20 Mar 2010 17:25:03 GMT
Subject: Ubuntu install problems
References: <99adedf9-e02d-4c71-983b-8901b9fa6791@w39g2000prd.googlegroups.com>
Message-ID: <4ba504ef$0$27838$c3e8da3@news.astraweb.com>

On Sat, 20 Mar 2010 10:00:47 -0700, waugust wrote:

> I have 2.5 (for GAE), 2.6 (Ubuntu default), and 3.1 installed. Whenever
> I apt-get install anything It ends with a series of python (dependency?)
> errors.  Anybody got any idea?

It looks like apt-get is supposed to be using 2.6 or 2.5, but somehow is 
running 3.1 instead.

If you run "python -V", what does it say?


-- 
Steven


From python at mrabarnett.plus.com  Sat Mar 20 13:26:58 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 20 Mar 2010 17:26:58 +0000
Subject: Ubuntu install problems
In-Reply-To: <99adedf9-e02d-4c71-983b-8901b9fa6791@w39g2000prd.googlegroups.com>
References: <99adedf9-e02d-4c71-983b-8901b9fa6791@w39g2000prd.googlegroups.com>
Message-ID: <4BA50562.1010600@mrabarnett.plus.com>

waugust wrote:
> I have 2.5 (for GAE), 2.6 (Ubuntu default), and 3.1 installed.
> Whenever I apt-get install anything It ends with a series of python
> (dependency?) errors.  Anybody got any idea?
>> aptget libgcj-common
> Reading package lists...
> Done
> Building dependency
> tree
> Reading state information...
> Done
> libgcj-common is already the newest
> version.
> 0 upgraded, 0 newly installed, 0 to remove and 6 not
> upgraded.
> 26 not fully installed or
> removed.
> After this operation, 0B of additional disk space will be
> used.
> Setting up libgcj-common
> (1:4.4.1-1ubuntu2) ...
> Compiling /usr/lib/python3.1/dist-packages/
> aotcompile.py ...
>   File "/usr/lib/python3.1/dist-packages/aotcompile.py", line
> 115
>     raise Error, "nothing to
> do"
>  
> ^
> SyntaxError: invalid
> syntax
> 
> Compiling /usr/lib/python3.1/dist-packages/classfile.py ...
>   File "/usr/lib/python3.1/dist-packages/classfile.py", line 30
>     raise TypeError, type(arg)
>                    ^
> SyntaxError: invalid syntax
> 
[snip]
In Python 2 an exception can be raised with the old-style:

     raise Error, "nothing to do"

or the new-style:

     raise Error("nothing to do")

In Python 3 the old style is not supported (it was abandoned as part of
the general clean-up).

Another related change is that the old-style:

     except Error, e:

in Python 2 has been completely replaced by the new-style:

     except Error as e:

in Python 3 (also available in Python 2.6).


From waugustynski at gmail.com  Sat Mar 20 13:40:08 2010
From: waugustynski at gmail.com (waugust)
Date: Sat, 20 Mar 2010 10:40:08 -0700 (PDT)
Subject: Ubuntu install problems
References: <99adedf9-e02d-4c71-983b-8901b9fa6791@w39g2000prd.googlegroups.com>
	<4ba504ef$0$27838$c3e8da3@news.astraweb.com>
Message-ID: <658a97c1-02d0-4158-a3b0-b82f1e66254a@q26g2000prh.googlegroups.com>

On Mar 20, 10:25?am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Sat, 20 Mar 2010 10:00:47 -0700, waugust wrote:
> > I have 2.5 (for GAE), 2.6 (Ubuntu default), and 3.1 installed. Whenever
> > I apt-get install anything It ends with a series of python (dependency?)
> > errors. ?Anybody got any idea?
>
> It looks like apt-get is supposed to be using 2.6 or 2.5, but somehow is
> running 3.1 instead.
>
> If you run "python -V", what does it say?
>
> --
> Steven

>python -V
Python 2.6.4

odd..yeah, I uninstalled all of the listed packages and started to
install again and got the same problem...


From saimapk81 at gmail.com  Sat Mar 20 14:03:00 2010
From: saimapk81 at gmail.com (saima81)
Date: Sat, 20 Mar 2010 11:03:00 -0700 (PDT)
Subject: "JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN 
	FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL JOBS
	IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
Message-ID: <9df66e21-4011-447c-9816-fc7f79416c4b@a37g2000prd.googlegroups.com>

"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
"JOBS IN FINLAND" "JOBS FINLAND" "FINLAND JOBS" "ACCOUNTS JOBS IN
FINLAND" "FINANCE JOBS IN FINLAND" "AGRI JPBS IN FINLAND" "MEDICAL
JOBS IN FINLAND" ON JOBS         http://jobs-in-finland.blogspot.com/
V


From agoretoy at gmail.com  Sat Mar 20 14:55:26 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Sat, 20 Mar 2010 12:55:26 -0600
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" 
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN 
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com>
Message-ID: <c9d33c541003201155j4150a3a0y503d97e311618e92@mail.gmail.com>

what do i do to remove this crap? how do i moderate it?

why not gpg sign messages on python-list that way you know your authorized
to post and spammers will have one more vector to deal with, there in
stopping the not so leet
-Alex Goretoy
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From Brian.Mingus at Colorado.EDU  Sat Mar 20 15:27:10 2010
From: Brian.Mingus at Colorado.EDU (Brian J Mingus)
Date: Sat, 20 Mar 2010 13:27:10 -0600
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" 
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN 
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <c9d33c541003201155j4150a3a0y503d97e311618e92@mail.gmail.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com> 
	<c9d33c541003201155j4150a3a0y503d97e311618e92@mail.gmail.com>
Message-ID: <9839a05c1003201227o5112a1f1i9de3a77ba7c613ab@mail.gmail.com>

Moderating this stuff requires moderating all messages. It would take a team
of volunteers.

On Sat, Mar 20, 2010 at 12:55 PM, alex goretoy <agoretoy at gmail.com> wrote:

> what do i do to remove this crap? how do i moderate it?
>
> why not gpg sign messages on python-list that way you know your authorized
> to post and spammers will have one more vector to deal with, there in
> stopping the not so leet
> -Alex Goretoy
>
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From darcy at druid.net  Sat Mar 20 15:37:48 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Sat, 20 Mar 2010 15:37:48 -0400
Subject: "EURO GIRLS" "MISS EUROPE"
In-Reply-To: <c9d33c541003201155j4150a3a0y503d97e311618e92@mail.gmail.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com>
	<c9d33c541003201155j4150a3a0y503d97e311618e92@mail.gmail.com>
Message-ID: <20100320153748.95f9cb49.darcy@druid.net>

On Sat, 20 Mar 2010 12:55:26 -0600
alex goretoy <agoretoy at gmail.com> wrote:
> what do i do to remove this crap? how do i moderate it?

First, please remove spam URLs when following up.  You left them in the
subject.

Maybe it's time to stop gatewaying the newsgroup to the mailing list.
As a test I have moved all Python posts from gmail.com with a
Newsgroup header into a separate folder and so far 99% of the spam
lands there.

Once you do that you can also enforce that posts can only come from
subscribed addresses.  I find that that cuts out almost 100% of the
spam.

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


From agoretoy at gmail.com  Sat Mar 20 15:54:18 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Sat, 20 Mar 2010 13:54:18 -0600
Subject: "EURO GIRLS" "MISS EUROPE"
In-Reply-To: <20100320153748.95f9cb49.darcy@druid.net>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com> 
	<c9d33c541003201155j4150a3a0y503d97e311618e92@mail.gmail.com> 
	<20100320153748.95f9cb49.darcy@druid.net>
Message-ID: <c9d33c541003201254y69c47a50y3e506c9d7b9e5f2a@mail.gmail.com>

On Sat, Mar 20, 2010 at 1:37 PM, D'Arcy J.M. Cain <darcy at druid.net> wrote:

> aybe it's time to stop gatewaying the newsgroup to the mailing list.
> As a test I have moved all Python posts from gmail.com with a
> Newsgroup header into
>

ok thx, I'm learning as I go along
-Alex Goretoy
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From mmanns at gmx.net  Sat Mar 20 17:30:09 2010
From: mmanns at gmx.net (Martin Manns)
Date: Sat, 20 Mar 2010 22:30:09 +0100
Subject: [ANN] Pyspread 0.1 released
Message-ID: <mailman.1017.1269123871.23598.python-announce-list@python.org>


Pyspread 0.1 released
=====================

After a long and eventful Alpha period, pyspread has finally reached
Beta stage. I thank all contributors and testers who have helped
getting pyspread to this point.

About: 
------

Pyspread is a cross-platform Python spreadsheet application. It is
based on and written in the programming language Python.

Instead of spreadsheet formulas, Python expressions are entered into
the spreadsheet cells. Each expression returns a Python object that can
be accessed from other cells. These objects can represent anything
including lists or matrices. 

Stability and compatibility
---------------------------

Pyspread runs pretty stable in CPython. Please note that old save files
are not compatible. Load them in the old version and copy the code to a
new version of pyspread via the clipboard. Being in Beta means
increased code stability. Save files are now going to be downwards
compatible. However, major beta releases (e. g. 0.1 to 0.2) may still
break compatibility. Such a change may occur only after being announced
in the previous major beta release.

New features
------------

    * New macro editor dialog.
    * Macros can now contain any Python code.
    * Macros load and save files are now plain text files.
    * Macros are now saved within the pys-file.
    * Macros files are now signed and included in the trusted file
      concept.

Bug fixes
---------

    * Cells can now be correctly accessed with negative index (BUG
      2965144)


Homepage
--------

http://pyspread.sourceforge.net



Enjoy

Martin



From gatoygata2 at gmail.com  Sat Mar 20 17:32:40 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Sat, 20 Mar 2010 14:32:40 -0700 (PDT)
Subject: How User-defined method objects are created?
References: <cf27c64f-ea5a-428c-898c-88d7eb748422@q23g2000yqd.googlegroups.com>
	<mailman.1009.1269103206.23598.python-list@python.org>
Message-ID: <d75118f3-c5ea-40e9-91a2-6b913dea50d7@d37g2000yqn.googlegroups.com>

On Mar 20, 5:39?pm, Terry Reedy <tjre... at udel.edu> wrote:
> On 3/20/2010 9:54 AM, Joaquin Abian wrote:
>
>
>
> > I'm trying to understand the description of method object creation in
> > the python 2.6 language reference (3.2. The standard type hierarchy)
> > with little success. The points knocking me are:
>
> > "User-defined method objects may be created when getting an attribute
> > of a class (perhaps via an instance of that class), if that attribute
> > is a user-defined function object, an unbound user-defined method
> > object, or a class method object. When the attribute is a user-defined
> > method object, a new method object is only created if the class from
> > which it is being retrieved is the same as, or a derived class of, the
> > class stored in the original method object; otherwise, the original
> > method object is used as it is."
>
> > It is a bit of a tongue-twister for me. What the last sentence means?
> > Please, I beg for a simple example of the different objects (user
> > defined function, user defined method, class method) refered.
> > Are maybe the refered objects exemplified by :
>
> > #python 3.1
> > class Klass():
>
> > ? ?def met(self):
> > ? ? ? ? ? ?print('method')
>
> > ? ? ? ? def func():
> > ? ? ? ? ? ?print('function')
>
> > ? ? ? ? @classmethod
> > ? ?def kmet(klass):
> > ? ? ? ? ? ?print('classmethod')
>
> > or it is talking about another thing?
> > What is the difference with python 3 where there is no mention to the
> > unbound user-defined method object (same section in python 3 language
> > reference):
>
> Python3 does not have unbound method objects. Klass.met above is just a
> function.l
>
> > "User-defined method objects may be created when getting an attribute
> > of a class (perhaps via an instance of that class), if that attribute
> > is a user-defined function object or a class method object."
>
> > I'm trying to learn, however the task is revealing as an enormous
> > undertaking :-)
>
> One can successfully use the language in the normal way without
> understanding every detail of every oddball corner case. Recent 2.x is
> complicated by duplication (two user object systems) and
> back-compatibility constraints. Most new users do not need to bother
> with obsolete complications.
>
> Terry Jan Reedy

Terry, Right, I was just reading about this difference in 2 vs 3 in
Lutz's book.
Well, in fact in my case I'm not a newcomer to python (neither a
professional). I have been programming for more than 4 years in python
mainly medium size scientific data management applications. Currently
I can write at a moderate speed and Im familiar with properties,
decorators, etc.

That's why it is so frustrating went I get lost in the language
reference manual in a matter I wrongly though was a simple stuff.

Thanks for your helpful comments.

JA


From gatoygata2 at gmail.com  Sat Mar 20 17:41:36 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Sat, 20 Mar 2010 14:41:36 -0700 (PDT)
Subject: How User-defined method objects are created?
References: <cf27c64f-ea5a-428c-898c-88d7eb748422@q23g2000yqd.googlegroups.com>
	<Xns9D41A6EC8DEA0duncanbooth@127.0.0.1>
Message-ID: <6e791682-f44c-43f1-948f-44e59e78c9f9@z4g2000yqa.googlegroups.com>

On Mar 20, 5:24?pm, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> Joaquin Abian <gatoyga... at gmail.com> wrote:
> > "User-defined method objects may be created when getting an attribute
> > of a class (perhaps via an instance of that class), if that attribute
> > is a user-defined function object, an unbound user-defined method
> > object, or a class method object. When the attribute is a user-defined
> > method object, a new method object is only created if the class from
> > which it is being retrieved is the same as, or a derived class of, the
> > class stored in the original method object; otherwise, the original
> > method object is used as it is."
>
> > It is a bit of a tongue-twister for me. What the last sentence means?
> > Please, I beg for a simple example of the different objects (user
> > defined function, user defined method, class method) refered.
> >>> class A(object):
>
> ? ? ? ? def foo(self): pass
>
> >>> class B(object):
>
> ? ? ? ? def bar(self): pass
>
> >>> B.baz = B.bar
> >>> B.foo = A.foo
> >>> instance = B()
> >>> B.foo
>
> <unbound method A.foo>>>> B.bar
>
> <unbound method B.bar>>>> B.baz
>
> <unbound method B.bar>>>> instance.foo
>
> <unbound method A.foo>>>> instance.bar
>
> <bound method B.bar of <__main__.B object at 0x00000000036B7780>>>>> instance.baz
>
> <bound method B.bar of <__main__.B object at 0x00000000036B7780>>>>> B.__dict__['bar']
>
> <function bar at 0x00000000036C5048>>>> B.__dict__['baz']
>
> <unbound method B.bar>>>> B.__dict__['foo']
>
> <unbound method A.foo>
>
> So, we have a function 'bar' stored in B's dict. When you access the
> function as the attribute B.bar Python 2.x will create an unbound method
> object. When you access the function through instance.bar Python creates a
> bound method. Note that every time you access instance.bar it creates
> another new method object:
>
> >>> instance.bar is instance.bar
>
> False
>
> B.baz is an unbound method stored directly in B's dict. When you access
> instance.baz you get a new bound method object (it's at the same memory
> location as the previous one but that's only because the lifetimes don't
> overlap). Somewhat suprisingly the same also happens if you access B.baz:
> it creates a new unbound method from the existing unbound method:
>
> >>> B.bar is B.__dict__['bar']
>
> False
>
> B.foo is an unbound method stored directly in B's dict, but it is a method
> of an A and B doesn't subclass A, so when you try to access B.foo you just
> get the stored unbound method it isn't converted into a new object.

Thanks Duncan, I think I got the idea. Your explanation together with
the comment from Terry about the absence of unbound method objects in
python 3 cleared some dust from my neuron(s)
Thanks!
JA


From no.email at please.post  Sat Mar 20 18:15:54 2010
From: no.email at please.post (kj)
Date: Sat, 20 Mar 2010 22:15:54 +0000 (UTC)
Subject: How to automate accessor definition?
Message-ID: <ho3heq$61v$1@reader1.panix.com>







I need to create a class solely for the purpose of encapsulating
a large number of disparate data items.  At the moment I have no
plans for any methods for this class other than the bazillion
accessors required to access these various instance variables.
(In case it matters, this class is meant to be a private helper
class internal to a module, and it won't be subclassed.)

What is "best practice" for implementing this sort of class
*succinctly* (i.e. without a lot of repetitive accessor code)?

Also, one more question concerning syntax.  Suppose that i represents
an instance of this class.  Is it possible to define the class to
support this syntax

  val = i.field
  i.field += 6

...rather than this one

  val = i.get_field()
  i.set_field(i.get_field() + 6)

?

TIA!

~K


From nilly16 at yahoo.com  Sat Mar 20 18:39:30 2010
From: nilly16 at yahoo.com (Jimbo)
Date: Sat, 20 Mar 2010 15:39:30 -0700 (PDT)
Subject: Best Way to extract Numbers from String
References: <ded7c9a6-e4b1-46f7-97ca-fd66708f7443@g1g2000pre.googlegroups.com>
	<c0f554a5-2407-40ff-9828-50e56b223d43@r1g2000yqj.googlegroups.com>
Message-ID: <61a6901b-40ce-4b7e-aa90-19696fcb9303@h35g2000pri.googlegroups.com>

On Mar 20, 11:51?pm, Luis M. Gonz?lez <luis... at gmail.com> wrote:
> On Mar 20, 12:04?am, Jimbo <nill... at yahoo.com> wrote:
>
>
>
>
>
> > Hello
>
> > I am trying to grab some numbers from a string containing HTML text.
> > Can you suggest any good functions that I could use to do this? What
> > would be the easiest way to extract the following numbers from this
> > string...
>
> > My String has this layout & I have commented what I want to grab:
> > [CODE] """</th>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="last">43.200 </td>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="change indicator" nowrap>0.040 </td>
>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?<td>43.150 </td> #
> > I need to grab this number only
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td>43.200 </td>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?<td>43.130 </td> #
> > I need to grab this number only
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td>43.290 </td> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td>43.100 </td> # I need to
> > grab this number only
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td>7,450,447 </td>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="middle"><a
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? href="/asx/markets/optionPrices.do?
> > by=underlyingCode&underlyingCode=BHP&expiryDate=&optionType=">Options</
> > a></td>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="middle"><a
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? href="/asx/markets/warrantPrices.do?
> > by=underlyingAsxCode&underlyingCode=BHP">Warrants & Structured
> > Products</a></td>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="middle"><a
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? href="/asx/markets/cfdPrices.do?
> > by=underlyingAsxCode&underlyingCode=BHP">CFDs</a></td>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td class="middle"><a href="http://hfgapps.hubb.com/asxtools/
> > Charts.aspx?
> > TimeFrame=D6&compare=comp_index&indicies=XJO&pma1=20&pma2=20&asxCode=BHP">< img
> > src="/images/chart.gif" border="0" height="15" width="15"></a>
> > </td>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td><a href="/research/announcements/status_notes.htm#XD">XD</a>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? </td>
> > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? <td><a href="/asx/statistics/announcements.do?
> > by=asxCode&asxCode=BHP&timeframe=D&period=W">Recent</a>
> > </td>
> > ? ? ? ? ? ? ? ? ? ? ? ? </tr>"""[/CODE]
>
> You should use BeautifulSoup or perhaps regular expressions.
> Or if you are not very smart, lik me, just try a brute force approach:
>
> >>> for i in s.split('>'):
>
> ? ? ? ? for e in i.split():
> ? ? ? ? ? ? ? ? if '.' in e and e[0].isdigit():
> ? ? ? ? ? ? ? ? ? ? ? ? print (e)
>
> 43.200
> 0.040
> 43.150
> 43.200
> 43.130
> 43.290
> 43.100
>
>
>
> - Hide quoted text -
>
> - Show quoted text -- Hide quoted text -
>
> - Show quoted text -

Thanks very much, I'm going to look at regular expressions but that
for your code, it shows me how I can do it iwth standard python :)


From clp2 at rebertia.com  Sat Mar 20 18:54:20 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Sat, 20 Mar 2010 15:54:20 -0700
Subject: How to automate accessor definition?
In-Reply-To: <ho3heq$61v$1@reader1.panix.com>
References: <ho3heq$61v$1@reader1.panix.com>
Message-ID: <50697b2c1003201554v3294b545sd2c53bd203111e5@mail.gmail.com>

On Sat, Mar 20, 2010 at 3:15 PM, kj <no.email at please.post> wrote:
> I need to create a class solely for the purpose of encapsulating
> a large number of disparate data items. ?At the moment I have no
> plans for any methods for this class other than the bazillion
> accessors required to access these various instance variables.
> (In case it matters, this class is meant to be a private helper
> class internal to a module, and it won't be subclassed.)

If it's just a completely dumb struct-like class, you might consider
something like:
http://docs.python.org/library/collections.html#collections.namedtuple

> What is "best practice" for implementing this sort of class
> *succinctly* (i.e. without a lot of repetitive accessor code)?

Is there any good reason you can't just use straight instance
variables? Python ain't Java; vanilla, boilerplate accessor methods
should almost always be avoided.

> Also, one more question concerning syntax. ?Suppose that i represents
> an instance of this class. ?Is it possible to define the class to
> support this syntax
>
> ?val = i.field
> ?i.field += 6
>
> ...rather than this one
>
> ?val = i.get_field()
> ?i.set_field(i.get_field() + 6)
>
> ?

Yes, using the magic of the property() function:
http://docs.python.org/library/functions.html#property

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


From waugustynski at gmail.com  Sat Mar 20 19:32:51 2010
From: waugustynski at gmail.com (waugust)
Date: Sat, 20 Mar 2010 16:32:51 -0700 (PDT)
Subject: Ubuntu install problems
References: <99adedf9-e02d-4c71-983b-8901b9fa6791@w39g2000prd.googlegroups.com>
	<4ba504ef$0$27838$c3e8da3@news.astraweb.com>
	<658a97c1-02d0-4158-a3b0-b82f1e66254a@q26g2000prh.googlegroups.com>
Message-ID: <b6958613-a955-4305-82fa-c3287391197d@l40g2000pro.googlegroups.com>

On Mar 20, 10:40?am, waugust <waugustyn... at gmail.com> wrote:
> On Mar 20, 10:25?am, Steven D'Aprano <st... at REMOVE-THIS-
>
> cybersource.com.au> wrote:
> > On Sat, 20 Mar 2010 10:00:47 -0700, waugust wrote:
> > > I have 2.5 (for GAE), 2.6 (Ubuntu default), and 3.1 installed. Whenever
> > > I apt-get install anything It ends with a series of python (dependency?)
> > > errors. ?Anybody got any idea?
>
> > It looks like apt-get is supposed to be using 2.6 or 2.5, but somehow is
> > running 3.1 instead.
>
> > If you run "python -V", what does it say?
>
> > --
> > Steven
> >python -V
>
> Python 2.6.4
>
> odd..yeah, I uninstalled all of the listed packages and started to
> install again and got the same problem...

So I put this up to the Ubuntu (lunchpad, apt) community support
board: https://answers.launchpad.net/ubuntu/+source/apt/+question/105025

Possible bug with the python-central package (Ubuntu x86 9.10)?? dunno.


From fordhaivat at gmail.com  Sat Mar 20 20:51:44 2010
From: fordhaivat at gmail.com (Someone Something)
Date: Sat, 20 Mar 2010 20:51:44 -0400
Subject: Best Way to extract Numbers from String
In-Reply-To: <c0f554a5-2407-40ff-9828-50e56b223d43@r1g2000yqj.googlegroups.com>
References: <ded7c9a6-e4b1-46f7-97ca-fd66708f7443@g1g2000pre.googlegroups.com>
	<c0f554a5-2407-40ff-9828-50e56b223d43@r1g2000yqj.googlegroups.com>
Message-ID: <e196a4051003201751t59e5b40evf4174b4584750cd3@mail.gmail.com>

Its an extremely bad idea to use regex for HTML. You want to change one tiny
little thing and you have to write the regex all over again. if its a
throwaway script, then go ahead.
2010/3/20 Luis M. Gonz?lez <luismgz at gmail.com>

> On Mar 20, 12:04 am, Jimbo <nill... at yahoo.com> wrote:
> > Hello
> >
> > I am trying to grab some numbers from a string containing HTML text.
> > Can you suggest any good functions that I could use to do this? What
> > would be the easiest way to extract the following numbers from this
> > string...
> >
> > My String has this layout & I have commented what I want to grab:
> > [CODE] """</th>
> >                                 <td class="last">43.200 </td>
> >                                 <td class="change indicator" nowrap>0.040
> </td>
> >
> >                                                    <td>43.150 </td> #
> > I need to grab this number only
> >                                 <td>43.200 </td>
> >                                                    <td>43.130 </td> #
> > I need to grab this number only
> >                                 <td>43.290 </td>
>                 <td>43.100 </td> # I need to
> > grab this number only
> >                                 <td>7,450,447 </td>
> >                                 <td class="middle"><a
> >
> href="/asx/markets/optionPrices.do?
> > by=underlyingCode&underlyingCode=BHP&expiryDate=&optionType=">Options</
> > a></td>
> >                                 <td class="middle"><a
> >
> href="/asx/markets/warrantPrices.do?
> > by=underlyingAsxCode&underlyingCode=BHP">Warrants & Structured
> > Products</a></td>
> >                                 <td class="middle"><a
> >                                         href="/asx/markets/cfdPrices.do?
> > by=underlyingAsxCode&underlyingCode=BHP">CFDs</a></td>
> >                                 <td class="middle"><a href="
> http://hfgapps.hubb.com/asxtools/
> > Charts.aspx?
> >
> TimeFrame=D6&compare=comp_index&indicies=XJO&pma1=20&pma2=20&asxCode=BHP"><
> img
> > src="/images/chart.gif" border="0" height="15" width="15"></a>
> > </td>
> >                                 <td><a
> href="/research/announcements/status_notes.htm#XD">XD</a>
> >                                 </td>
> >                                 <td><a
> href="/asx/statistics/announcements.do?
> > by=asxCode&asxCode=BHP&timeframe=D&period=W">Recent</a>
> > </td>
> >                         </tr>"""[/CODE]
>
>
> You should use BeautifulSoup or perhaps regular expressions.
> Or if you are not very smart, lik me, just try a brute force approach:
>
> >>> for i in s.split('>'):
>        for e in i.split():
>                if '.' in e and e[0].isdigit():
>                        print (e)
>
>
> 43.200
> 0.040
> 43.150
> 43.200
> 43.130
> 43.290
> 43.100
> >>>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From fordhaivat at gmail.com  Sat Mar 20 20:53:45 2010
From: fordhaivat at gmail.com (Someone Something)
Date: Sat, 20 Mar 2010 20:53:45 -0400
Subject: How to automate accessor definition?
In-Reply-To: <50697b2c1003201554v3294b545sd2c53bd203111e5@mail.gmail.com>
References: <ho3heq$61v$1@reader1.panix.com>
	<50697b2c1003201554v3294b545sd2c53bd203111e5@mail.gmail.com>
Message-ID: <e196a4051003201753l45d52b37w6b0ac0d2d1ec7f38@mail.gmail.com>

Just initialize everything in the constructor, unless you have *really *good
reason not to do that.
On Sat, Mar 20, 2010 at 6:54 PM, Chris Rebert <clp2 at rebertia.com> wrote:

> On Sat, Mar 20, 2010 at 3:15 PM, kj <no.email at please.post> wrote:
> > I need to create a class solely for the purpose of encapsulating
> > a large number of disparate data items.  At the moment I have no
> > plans for any methods for this class other than the bazillion
> > accessors required to access these various instance variables.
> > (In case it matters, this class is meant to be a private helper
> > class internal to a module, and it won't be subclassed.)
>
> If it's just a completely dumb struct-like class, you might consider
> something like:
> http://docs.python.org/library/collections.html#collections.namedtuple
>
> > What is "best practice" for implementing this sort of class
> > *succinctly* (i.e. without a lot of repetitive accessor code)?
>
> Is there any good reason you can't just use straight instance
> variables? Python ain't Java; vanilla, boilerplate accessor methods
> should almost always be avoided.
>
> > Also, one more question concerning syntax.  Suppose that i represents
> > an instance of this class.  Is it possible to define the class to
> > support this syntax
> >
> >  val = i.field
> >  i.field += 6
> >
> > ...rather than this one
> >
> >  val = i.get_field()
> >  i.set_field(i.get_field() + 6)
> >
> > ?
>
> Yes, using the magic of the property() function:
> http://docs.python.org/library/functions.html#property
>
> Cheers,
> Chris
> --
> http://blog.rebertia.com
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 20 22:31:32 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 21 Mar 2010 02:31:32 GMT
Subject: How to automate accessor definition?
References: <ho3heq$61v$1@reader1.panix.com>
Message-ID: <4ba58503$0$27838$c3e8da3@news.astraweb.com>

On Sat, 20 Mar 2010 22:15:54 +0000, kj wrote:

> I need to create a class solely for the purpose of encapsulating a large
> number of disparate data items.

There's a built-in for that. It's called "dict". Syntax for item access 
is a tiny bit different, but still very common:

data['foo']

instead of

data.foo

If you need to customize item access, you need to modify __getitem__, 
__setitem__ and __delitem__ instead of __getattr__ etc., but otherwise 
they are nearly identical. Ignoring a few complications due to slots and 
inheritance, attribute access is built on top of item access, so you 
won't notice any performance hit (and you might see a tiny performance 
benefit).


> At the moment I have no plans for any
> methods for this class other than the bazillion accessors required to
> access these various instance variables.

Huh? If you have instance variables, why don't you refer to them by name?

x = MyClass()  # create an instance
y = MyClass()  # another variable bound to an instance
z = MyClass()  # etc.
print x, y, z



> (In case it matters, this class
> is meant to be a private helper class internal to a module, and it won't
> be subclassed.)
> 
> What is "best practice" for implementing this sort of class *succinctly*
> (i.e. without a lot of repetitive accessor code)?

Leave the repetitive accessor code out. Python isn't Java.

http://dirtsimple.org/2004/12/python-is-not-java.html


> Also, one more question concerning syntax.  Suppose that i represents an
> instance of this class.  Is it possible to define the class to support
> this syntax
> 
>   val = i.field
>   i.field += 6

Classes already support that.


>>> class C(object):
...     pass
...
>>> i = C()
>>> i.field = 42
>>> val = i.field
>>> i.field += 6
>>> print (val, i.field)
42 48


 
> ...rather than this one
> 
>   val = i.get_field()
>   i.set_field(i.get_field() + 6)
> 
> ?

Good grief! No wonder Java coders are so unproductive :(




-- 
Steven


From gregory.j.baker at gmail.com  Sat Mar 20 23:37:53 2010
From: gregory.j.baker at gmail.com (Novocastrian_Nomad)
Date: Sat, 20 Mar 2010 20:37:53 -0700 (PDT)
Subject: Best Way to extract Numbers from String
References: <ded7c9a6-e4b1-46f7-97ca-fd66708f7443@g1g2000pre.googlegroups.com>
	<c0f554a5-2407-40ff-9828-50e56b223d43@r1g2000yqj.googlegroups.com> 
	<61a6901b-40ce-4b7e-aa90-19696fcb9303@h35g2000pri.googlegroups.com>
Message-ID: <d2915a9a-23c7-4118-a1d2-8b92f5769c5e@a10g2000pri.googlegroups.com>

Regular expression are very powerful, and I use them  a lot in my
paying job (unfortunately not with Python).  You are however,
basically using a second programing language, which can be difficult
to master.

Does this give you the desired result?

import re

matches = re.findall('<td>([\d\.,]+)\s*</td>', code)
for match in matches:
    print match

resulting in this output:
43.150
43.200
43.130
43.290
43.100
7,450,447


From renws1990 at gmail.com  Sun Mar 21 03:23:26 2010
From: renws1990 at gmail.com (Ren Wenshan)
Date: Sun, 21 Mar 2010 00:23:26 -0700 (PDT)
Subject: How to keep effects of image filters going for some seconds?
Message-ID: <b151eeba-1e33-4f9e-b6c4-678af8cc5540@v20g2000prc.googlegroups.com>

Hello, every pythoner.

Firstly, I want to mention that English is my second language, so
maybe there are some sentences which makes you confused, sorry.

I have been learning Panda3D, an open source 3D engine, these days.
Now, I'm trying to write a small game for fun and practice. However,
I've ran into a problem.

I want to make some speical effects and there is my code:

def ventose(self):

    global potato_HP

    if potato_HP[0] == 1 and potato_HP[1] == 0:
    if random() > .30:
        self.filters.setCartoonInk(separation = 0.8)
        self.robotVincent.resetHead.start()
        self.decreaseVincentHP()
            Wait(3)
            self.fliters.delCartoonInk()

However, it doesn't work, the CartoonInk effect will never been shown
in my game and I don't want my game to wait three seconds, what I need
is to keep the effect for a period of time while the game run as well.

Besides that, I also want to show a counting back like "3", then "2",
then "1", finally "Go".

As a beginner, I don't know how to do them properly.

Please give me some directions, thank you.


-----------------------------
Vincent Ren



From jah.alarm at gmail.com  Sun Mar 21 06:11:05 2010
From: jah.alarm at gmail.com (Jah_Alarm)
Date: Sun, 21 Mar 2010 03:11:05 -0700 (PDT)
Subject: nonuniform sampling with replacement
Message-ID: <0c333952-2150-4207-90e8-7bb3f2bc7c4c@b9g2000pri.googlegroups.com>

I've got a vector length n of integers (some of them are repeating),
and I got a selection probability vector of the same length. How will
I sample with replacement k (<=n) values with the probabilty vector.
In Matlab this function is randsample. I couldn't find anything to
this extent in Scipy or Numpy.

thanks for the help

Alex


From donn.ingle at gmail.com  Sun Mar 21 07:08:07 2010
From: donn.ingle at gmail.com (donn)
Date: Sun, 21 Mar 2010 13:08:07 +0200
Subject: How to keep effects of image filters going for some seconds?
In-Reply-To: <b151eeba-1e33-4f9e-b6c4-678af8cc5540@v20g2000prc.googlegroups.com>
References: <b151eeba-1e33-4f9e-b6c4-678af8cc5540@v20g2000prc.googlegroups.com>
Message-ID: <4BA5FE17.20909@gmail.com>

On 21/03/2010 09:23, Ren Wenshan wrote:
> I have been learning Panda3D, an open source 3D engine,
Ask on the Panda3D forums, you will get good help there.

\d


From alfps at start.no  Sun Mar 21 08:03:00 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Sun, 21 Mar 2010 13:03:00 +0100
Subject: nonuniform sampling with replacement
In-Reply-To: <0c333952-2150-4207-90e8-7bb3f2bc7c4c@b9g2000pri.googlegroups.com>
References: <0c333952-2150-4207-90e8-7bb3f2bc7c4c@b9g2000pri.googlegroups.com>
Message-ID: <ho51tp$g6f$1@news.eternal-september.org>

* Jah_Alarm:
> I've got a vector length n of integers (some of them are repeating),
> and I got a selection probability vector of the same length. How will
> I sample with replacement k (<=n) values with the probabilty vector.
> In Matlab this function is randsample. I couldn't find anything to
> this extent in Scipy or Numpy.

<code>
#Py3
import operator     # itemgetter
import random
from collections import defaultdict

def normalized_to_sum( s, v ):
     current_s = sum( v )
     c = s/current_s
     return [c*x for x in v]

class ValueSampler:
     def __init__( self, values, probabilities ):
         assert len( values ) == len( probabilities )
         get2nd = operator.itemgetter( 1 )
         v_p = sorted( zip( values, probabilities ), key = get2nd, reverse = True )
         v_ap = [];  sum = 0;
         for (v, p) in v_p:
             v_ap.append( (v, p + sum) );
             sum += p
         self._data = v_ap

     def __call__( self, p ):
         return self.choice( p )

     def choice( self, p ):
         data = self._data; i_v = 0; i_p = 1;
         assert 0 <= p <= 1
         assert len( data ) > 0, "Sampler: Sampling from empty value set"
         low = 0; high = len( data ) - 1;
         if p > data[high][i_p]: return data[high][i_p]  # Float values workaround.
         while low != high:
             mid = (low + high)//2
             if p > data[mid][i_p]:
                 low = mid + 1
             else:
                 high = mid
         return data[low][i_v]


def main():
     v = [3, 1, 4, 1, 5, 9, 2, 6, 5, 4];
     p = normalized_to_sum( 1, [2, 7, 1, 8, 2, 8, 1, 8, 2, 8] )
     sampler = ValueSampler( v, p )

     probabilities = defaultdict( lambda: 0.0 )
     for (i, value) in enumerate( v ):
         probabilities[value] += p[i]
     print( probabilities )
     print()

     frequencies = defaultdict( lambda: 0.0 )
     n = 100000
     for i in range( n ):
         value = sampler( random.random() )
         frequencies[value] += 1/n
     print( frequencies )

main()
</code>


Cheers & hth.,

- Alf

Disclaimer: I just cooked it up and just cooked up binary searches usually have 
bugs. They usually need to be exercised and fixed. But I think you get the idea. 
Note also that division differs in Py3 and Py2. This is coded for Py3.


From __peter__ at web.de  Sun Mar 21 08:27:44 2010
From: __peter__ at web.de (Peter Otten)
Date: Sun, 21 Mar 2010 13:27:44 +0100
Subject: nonuniform sampling with replacement
References: <0c333952-2150-4207-90e8-7bb3f2bc7c4c@b9g2000pri.googlegroups.com>
Message-ID: <ho53bu$eeh$03$1@news.t-online.com>

Jah_Alarm wrote:

> I've got a vector length n of integers (some of them are repeating),
> and I got a selection probability vector of the same length. How will
> I sample with replacement k (<=n) values with the probabilty vector.
> In Matlab this function is randsample. I couldn't find anything to
> this extent in Scipy or Numpy.

If all else fails you can do it yourself:

import random
import bisect

def iter_sample_with_replacement(values, weights):
    _random = random.random
    _bisect = bisect.bisect

    acc_weights = []
    sigma = 0
    for w in weights:
        sigma += w
        acc_weights.append(sigma)
    while 1:
        yield values[_bisect(acc_weights, _random()*sigma)]

def sample_with_replacement(k, values, weights):
    return list(islice(iter_sample_with_replacement(values, weights), k))

if __name__ == "__main__":
    from itertools import islice
    N = 10**6
    values = range(4)
    weights = [2, 3, 4, 1]

    histo = [0] * len(values)
    for v in islice(iter_sample_with_replacement(values, weights), N):
        histo[v] += 1
    print histo
    print sample_with_replacement(30, values, weights)

Peter

                   



From alfps at start.no  Sun Mar 21 08:28:15 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Sun, 21 Mar 2010 13:28:15 +0100
Subject: nonuniform sampling with replacement
In-Reply-To: <ho51tp$g6f$1@news.eternal-september.org>
References: <0c333952-2150-4207-90e8-7bb3f2bc7c4c@b9g2000pri.googlegroups.com>
	<ho51tp$g6f$1@news.eternal-september.org>
Message-ID: <ho53d3$o12$1@news.eternal-september.org>

* Alf P. Steinbach:
> * Jah_Alarm:
>> I've got a vector length n of integers (some of them are repeating),
>> and I got a selection probability vector of the same length. How will
>> I sample with replacement k (<=n) values with the probabilty vector.
>> In Matlab this function is randsample. I couldn't find anything to
>> this extent in Scipy or Numpy.
> 
> <code>
[snip]
> </code>
> 
> 
> Disclaimer: I just cooked it up and just cooked up binary searches 
> usually have bugs. They usually need to be exercised and fixed. But I 
> think you get the idea. Note also that division differs in Py3 and Py2. 
> This is coded for Py3.

Sorry, I realized this just now: the name "p" in the choice() method is utterly 
misleading, which you can see from the call; it's a random number not a 
probability. I guess my fingers just repeated what they typed earlier.


Cheeers,

- Alf (repeat typist)


From slais-www at ucl.ac.uk  Sun Mar 21 10:29:58 2010
From: slais-www at ucl.ac.uk (djc)
Date: Sun, 21 Mar 2010 14:29:58 +0000
Subject: should writing Unicode files be so slow
In-Reply-To: <mailman.993.1269044370.23598.python-list@python.org>
References: <hnu9gl$fg7e$1@uns-a.ucl.ac.uk>
	<8739zxw057.fsf@benfinney.id.au>	<hnvpfj$7k76$1@uns-a.ucl.ac.uk>
	<87ljdov59q.fsf@benfinney.id.au>	<ho0bkp$cc3g$1@uns-a.ucl.ac.uk>
	<mailman.993.1269044370.23598.python-list@python.org>
Message-ID: <ho5ah6$eo6s$1@uns-a.ucl.ac.uk>

Antoine Pitrou wrote:
> Le Fri, 19 Mar 2010 17:18:17 +0000, djc a ?crit :
>> changing
>> with open(filename, 'rU') as tabfile: to
>> with codecs.open(filename, 'rU', 'utf-8', 'backslashreplace') as
>> tabfile:
>>
>> and
>> with open(outfile, 'wt') as out_part: to
>> with codecs.open(outfile, 'w', 'utf-8') as out_part:
>>
>> causes a program that runs  in
>> 43 seconds to take 4 minutes to process the same data.
> 
> codecs.open() (and the object it returns) is slow as it is written in 
> pure Python.
> 
> Accelerated reading and writing of unicode files is available in Python 
> 2.7 and 3.1, using the new `io` module.

Thank you, for a clear and to the point explanation. I shall concentrate on
finding an optimal time to upgrade from Python 2.6.


-- 
David Clark, MSc, PhD.              UCL Centre for Publishing
                                    Gower Str London WCIE 6BT
What sort of web animal are you?
            <https://www.bbc.co.uk/labuk/experiments/webbehaviour>


From ra21vi at gmail.com  Sun Mar 21 10:43:27 2010
From: ra21vi at gmail.com (Ravi Kumar)
Date: Sun, 21 Mar 2010 14:43:27 +0000
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" 
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN 
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <9839a05c1003201227o5112a1f1i9de3a77ba7c613ab@mail.gmail.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com> 
	<c9d33c541003201155j4150a3a0y503d97e311618e92@mail.gmail.com> 
	<9839a05c1003201227o5112a1f1i9de3a77ba7c613ab@mail.gmail.com>
Message-ID: <9a63e8921003210743t30fac328oed4a5b336ebcda19@mail.gmail.com>

On Sat, Mar 20, 2010 at 7:27 PM, Brian J Mingus
<Brian.Mingus at colorado.edu>wrote:

> Moderating this stuff requires moderating all messages. It would take a
> team of volunteers.
>

You are right... Form the team of volunteers. More people in it, better it
would be - since no one would have to be dedicated.

-- 
-=Ravi=-
-------------- next part --------------
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From vicente.soler at gmail.com  Sun Mar 21 11:02:45 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sun, 21 Mar 2010 08:02:45 -0700 (PDT)
Subject: Clearing memory (namespace) before running code
Message-ID: <0756022b-3893-4558-ab06-79bb467f1da4@b30g2000yqd.googlegroups.com>

Hi,

Is there a way to erase/delete/clear memory before a piece of code is
run?

Otherwise, the objects of the previous run are re-usable, and may
bring confusion to the tester.

Thank you


From steve at holdenweb.com  Sun Mar 21 11:11:18 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 21 Mar 2010 11:11:18 -0400
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS"
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com>
Message-ID: <ho5cv5$sp8$1@dough.gmane.org>

Brian J Mingus wrote:
> 
[... duplicating the spam and thereby lending it further Google juice ...]
>     --
>     http://mail.python.org/mailman/listinfo/python-list
> 
> Guys, I know it is a lot of work to moderate a large mailing list. But
> still, with so many of us surely we can pull it off?
> 
It's actually not as easy as you might think. If someone can propose a
*practical* scheme for moderation of this high-volume list the PSF might
consider such a proposal, but there would need to be considerable
evidence that the scheme would work without delaying traffic.

Since the spam that's getting through actually represents a tiny
fraction of one percent of the spam that the list is bombarded with I
personally feel that there would be very little positive return for a
relatively large investment of effort, and that any volunteer time would
be better spent making other contributions to the Python community.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Sun Mar 21 11:13:44 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 21 Mar 2010 11:13:44 -0400
Subject: Clearing memory (namespace) before running code
In-Reply-To: <0756022b-3893-4558-ab06-79bb467f1da4@b30g2000yqd.googlegroups.com>
References: <0756022b-3893-4558-ab06-79bb467f1da4@b30g2000yqd.googlegroups.com>
Message-ID: <ho5d3n$sp8$2@dough.gmane.org>

vsoler wrote:
> Hi,
> 
> Is there a way to erase/delete/clear memory before a piece of code is
> run?
> 
> Otherwise, the objects of the previous run are re-usable, and may
> bring confusion to the tester.
> 
> Thank you

You mean clear a *namespace*?

That might be possible if you have access to the specific module whose
namespace you want to clear.

I presume this is related to earlier questions about reloading modules?
This is yet another reason why you might want to consider running each
module in its own process each time the user submits it.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From joncle at googlemail.com  Sun Mar 21 11:18:01 2010
From: joncle at googlemail.com (Jon Clements)
Date: Sun, 21 Mar 2010 08:18:01 -0700 (PDT)
Subject: Clearing memory (namespace) before running code
References: <0756022b-3893-4558-ab06-79bb467f1da4@b30g2000yqd.googlegroups.com>
Message-ID: <42678333-5b0f-43bb-9488-7e127d078083@l25g2000yqd.googlegroups.com>

On 21 Mar, 15:02, vsoler <vicente.so... at gmail.com> wrote:
> Hi,
>
> Is there a way to erase/delete/clear memory before a piece of code is
> run?
>
> Otherwise, the objects of the previous run are re-usable, and may
> bring confusion to the tester.
>
> Thank you

I'm guessing you're using some sort of IDE?

For instance, in IDLE if the [Python Shell] window is not closed, the
session is kept. However, there is a menu option 'Shell' which has
'Restart Shell'. If you don't see a 'Shell' menu option, then make
sure IDLE isn't being started with the -n option.

However I would have thought the 'tester' would be running from a
terminal/command line/double click jobby, so that a single Python
session is executed and just runs -- rather than want to use it
interactively afterwards.

hth

Jon.


From deets at nospam.web.de  Sun Mar 21 12:08:58 2010
From: deets at nospam.web.de (Diez B. Roggisch)
Date: 21 Mar 2010 16:08:58 GMT
Subject: How to automate accessor definition?
References: <ho3heq$61v$1@reader1.panix.com>
Message-ID: <639908184290880449.447600deets-nospam.web.de@news.hansenet.de>

kj <no.email at please.post> wrote:
> 
> 
> 
> 
> 
> 
> I need to create a class solely for the purpose of encapsulating
> a large number of disparate data items.  At the moment I have no
> plans for any methods for this class other than the bazillion
> accessors required to access these various instance variables.
> (In case it matters, this class is meant to be a private helper
> class internal to a module, and it won't be subclassed.)
> 
> What is "best practice" for implementing this sort of class
> *succinctly* (i.e. without a lot of repetitive accessor code)?
> 
> Also, one more question concerning syntax.  Suppose that i represents
> an instance of this class.  Is it possible to define the class to
> support this syntax
> 
>   val = i.field
>   i.field += 6
> 
> ...rather than this one
> 
>   val = i.get_field()
>   i.set_field(i.get_field() + 6)
> 
> ?


You don't. Python is not Java. So just use instance attributes, and if
you need bhavior when accessing an attribute, introduce a property. 

Diez


From zookog at gmail.com  Sun Mar 21 12:55:41 2010
From: zookog at gmail.com (Zooko O'Whielacronx)
Date: Sun, 21 Mar 2010 10:55:41 -0600
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" 
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN 
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <9839a05c1003201227o5112a1f1i9de3a77ba7c613ab@mail.gmail.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com>
	<c9d33c541003201155j4150a3a0y503d97e311618e92@mail.gmail.com>
	<9839a05c1003201227o5112a1f1i9de3a77ba7c613ab@mail.gmail.com>
Message-ID: <cd6401a1003210955u3678ad25y2d6b3f549a24cc03@mail.gmail.com>

On Sat, Mar 20, 2010 at 1:27 PM, Brian J Mingus
<Brian.Mingus at colorado.edu> wrote:
> Moderating this stuff requires moderating all messages.

Not quite. GNU Mailman comes with nice features to ease this task. You
can configure it so that everyone who is currently subscribed can post
freely, but new subscribers get a "moderated" bit set on them. The
first time this new subscriber attempts to post to the list, a human
moderator has to inspect their message and decide whether to approve
it or deny it. If they human moderator approves it, they can also on
the same web form remove the "moderated" bit from that poster.

Therefore, the volunteer work required would be inspecting the *first*
post from each *new* subscriber to see if that post is spam.

Regards,

Zooko


From no.email at please.post  Sun Mar 21 12:57:40 2010
From: no.email at please.post (kj)
Date: Sun, 21 Mar 2010 16:57:40 +0000 (UTC)
Subject: How to automate accessor definition?
References: <ho3heq$61v$1@reader1.panix.com>
	<639908184290880449.447600deets-nospam.web.de@news.hansenet.de>
Message-ID: <ho5j64$22l$1@reader1.panix.com>

In <639908184290880449.447600deets-nospam.web.de at news.hansenet.de> Diez B. Roggisch <deets at nospam.web.de> writes:

>You don't. Python is not Java. So just use instance attributes, and if
>you need bhavior when accessing an attribute, introduce a property. 


Just accessing attributes looks a bit dangerous to me, due to bugs
like typing

  i.typo = 'foo'

when what you meant is

  i.type = 'foo'

I tried fixing this by mucking with __setattr__, but I didn't hit
on a satisfactory solution (basically, I couldn't find a good,
self-maintaining, way to specify the attributes that were OK to
set from those that weren't).  Is there anything built-in?

Regarding properties, is there a built-in way to memoize them? For
example, suppose that the value of a property is obtained by parsing
the contents of a file (specified in another instance attribute).
It would make no sense to do this parsing more than once.  Is there
a standard idiom for memoizing the value once it is determined for
the first time?

Thanks!

~K


From no.email at please.post  Sun Mar 21 13:02:30 2010
From: no.email at please.post (kj)
Date: Sun, 21 Mar 2010 17:02:30 +0000 (UTC)
Subject: How to automate accessor definition?
References: <ho3heq$61v$1@reader1.panix.com>
	<mailman.1018.1269125666.23598.python-list@python.org>
Message-ID: <ho5jf5$22l$2@reader1.panix.com>

In <mailman.1018.1269125666.23598.python-list at python.org> Chris Rebert <clp2 at rebertia.com> writes:

>On Sat, Mar 20, 2010 at 3:15 PM, kj <no.email at please.post> wrote:
>> I need to create a class solely for the purpose of encapsulating
>> a large number of disparate data items. =C2=A0At the moment I have no
>> plans for any methods for this class other than the bazillion
>> accessors required to access these various instance variables.
>> (In case it matters, this class is meant to be a private helper
>> class internal to a module, and it won't be subclassed.)

>If it's just a completely dumb struct-like class, you might consider
>something like:
>http://docs.python.org/library/collections.html#collections.namedtuple

Very cool.  Thanks!  The class I have in mind is *almost* that
dumb, but performance is a consideration in this case, which may
rule out namedtuple.  But I'm glad to learn about it; there are
many places where I can put them to good use.

~K


From benjamin at python.org  Sun Mar 21 13:12:08 2010
From: benjamin at python.org (Benjamin Peterson)
Date: Sun, 21 Mar 2010 12:12:08 -0500
Subject: [RELEASED] Python 3.1.2
Message-ID: <1afaf6161003211012r30bc0e77ub5dfe9f248668525@mail.gmail.com>

On behalf of the Python development team, I'm joyful to announce the second
bugfix release of the Python 3.1 series, Python 3.1.2.

This bug fix release fixes numerous issues found in 3.1.1, and is considered a
production release.

The Python 3.1 version series focuses on the stabilization and optimization of
the features and changes that Python 3.0 introduced.  For example, the new I/O
system has been rewritten in C for speed.  File system APIs that use unicode
strings now handle paths with undecodable bytes in them. Other features include
an ordered dictionary implementation, a condensed syntax for nested with
statements, and support for ttk Tile in Tkinter.  For a more extensive list of
changes in 3.1, see http://doc.python.org/3.1/whatsnew/3.1.html or Misc/NEWS in
the Python distribution.

To download Python 3.1.2 visit:

     http://www.python.org/download/releases/3.1.2/

A list of changes in 3.1.2 can be found here:

     http://svn.python.org/projects/python/tags/r312/Misc/NEWS

The 3.1 documentation can be found at:

     http://docs.python.org/3.1

Bugs can always be reported to:

     http://bugs.python.org


Enjoy!

--
Benjamin Peterson
Release Manager
benjamin at python.org
(on behalf of the entire python-dev team and 3.1.2's contributors)


From steve at holdenweb.com  Sun Mar 21 13:12:23 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 21 Mar 2010 13:12:23 -0400
Subject: How to automate accessor definition?
In-Reply-To: <ho5jf5$22l$2@reader1.panix.com>
References: <ho3heq$61v$1@reader1.panix.com>	<mailman.1018.1269125666.23598.python-list@python.org>
	<ho5jf5$22l$2@reader1.panix.com>
Message-ID: <ho5k28$jge$1@dough.gmane.org>

kj wrote:
> In <mailman.1018.1269125666.23598.python-list at python.org> Chris Rebert <clp2 at rebertia.com> writes:
> 
>> On Sat, Mar 20, 2010 at 3:15 PM, kj <no.email at please.post> wrote:
>>> I need to create a class solely for the purpose of encapsulating
>>> a large number of disparate data items. =C2=A0At the moment I have no
>>> plans for any methods for this class other than the bazillion
>>> accessors required to access these various instance variables.
>>> (In case it matters, this class is meant to be a private helper
>>> class internal to a module, and it won't be subclassed.)
> 
>> If it's just a completely dumb struct-like class, you might consider
>> something like:
>> http://docs.python.org/library/collections.html#collections.namedtuple
> 
> Very cool.  Thanks!  The class I have in mind is *almost* that
> dumb, but performance is a consideration in this case, which may
> rule out namedtuple.  But I'm glad to learn about it; there are
> many places where I can put them to good use.
> 
You may well find that namedtuple is faster than what you put together
yourself, as the collections module is implemented in C.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From no.email at please.post  Sun Mar 21 13:25:08 2010
From: no.email at please.post (kj)
Date: Sun, 21 Mar 2010 17:25:08 +0000 (UTC)
Subject: How to automate accessor definition?
References: <ho3heq$61v$1@reader1.panix.com>
	<4ba58503$0$27838$c3e8da3@news.astraweb.com>
Message-ID: <ho5kpk$j4p$1@reader1.panix.com>

In <4ba58503$0$27838$c3e8da3 at news.astraweb.com> Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:

>On Sat, 20 Mar 2010 22:15:54 +0000, kj wrote:

>> I need to create a class solely for the purpose of encapsulating a large
>> number of disparate data items.

>There's a built-in for that. It's called "dict". Syntax for item access 
>is a tiny bit different, but still very common:

>data['foo']

>instead of

>data.foo

I find the latter more readable than the former.  All those extra
elements (the brackets and the quotes, vs the single dot) add
Perl-like visual noise to the code, IMHO.

And dicts are vulnerable to this sort of bug:

  data['typo'] = type(foobar)

Also, AFAIK, initialization of a dictionary is never as simple as

  i = myclass(*fields)

But in a sense you're right: aside from these objections,
*functionality-wise* what I'm looking for is not very different
from a dictionary, or a C struct.

>> At the moment I have no plans for any
>> methods for this class other than the bazillion accessors required to
>> access these various instance variables.

>Huh? If you have instance variables, why don't you refer to them by name?

I'm sorry, I used the wrong terminology.  I see now that the correct
term is "(instance) attribute", not "instance variable".

>Leave the repetitive accessor code out. Python isn't Java.

>http://dirtsimple.org/2004/12/python-is-not-java.html

Thanks for the link!  The bit about "Guido's time machine" is pretty
funny.

~K


From benjamin.kaplan at case.edu  Sun Mar 21 13:38:42 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Sun, 21 Mar 2010 13:38:42 -0400
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" 
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN 
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <cd6401a1003210955u3678ad25y2d6b3f549a24cc03@mail.gmail.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com>
	<c9d33c541003201155j4150a3a0y503d97e311618e92@mail.gmail.com>
	<9839a05c1003201227o5112a1f1i9de3a77ba7c613ab@mail.gmail.com>
	<cd6401a1003210955u3678ad25y2d6b3f549a24cc03@mail.gmail.com>
Message-ID: <ec96e1391003211038t48ff17abs338b7ab05d7626b8@mail.gmail.com>

On Sun, Mar 21, 2010 at 12:55 PM, Zooko O'Whielacronx <zookog at gmail.com> wrote:
> On Sat, Mar 20, 2010 at 1:27 PM, Brian J Mingus
> <Brian.Mingus at colorado.edu> wrote:
>> Moderating this stuff requires moderating all messages.
>
> Not quite. GNU Mailman comes with nice features to ease this task. You
> can configure it so that everyone who is currently subscribed can post
> freely, but new subscribers get a "moderated" bit set on them. The
> first time this new subscriber attempts to post to the list, a human
> moderator has to inspect their message and decide whether to approve
> it or deny it. If they human moderator approves it, they can also on
> the same web form remove the "moderated" bit from that poster.
>
> Therefore, the volunteer work required would be inspecting the *first*
> post from each *new* subscriber to see if that post is spam.
>
> Regards,
>
> Zooko

The spam isn't coming through the mailing list. It's coming through
the Google Groups mirror of the Usenet newsgroup. I don't think
Mailman can do anything about that.


From pmaupin at gmail.com  Sun Mar 21 13:42:34 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sun, 21 Mar 2010 10:42:34 -0700 (PDT)
Subject: RSON 0.06 released
Message-ID: <0b40fdf6-3fdd-4962-9994-c7c0936c588a@x12g2000yqx.googlegroups.com>

I am pleased to announce the release of RSON 0.06.

The goal of the RSON project is to create a file format that is easy
to edit, diff, and version control, that is a superset of JSON and
smaller than YAML.

I consider this release to be feature complete on the file format, and
I believe the pure Python 2.x decoder (parser) to be production worthy
(for users who do not need the speed of a C based decoder).

The project is at:

http://rson.googlecode.com/

The manual with syntax examples is at:

http://rson.googlecode.com/files/rson_0_06_manual.pdf

Discussions at:

http://groups.google.com/group/rson-discuss



From ale.marino78 at gmail.com  Sun Mar 21 14:12:18 2010
From: ale.marino78 at gmail.com (Alessandro Marino)
Date: Sun, 21 Mar 2010 19:12:18 +0100
Subject: Regexp problem when parsing a string
Message-ID: <9b9cf8321003211112q2333fb74h29e9a805053d1a13@mail.gmail.com>

I'm a beginner and I was trying to write a program to parse recursively all
file names in a directory specified as parameter. The problem is that I get
a "None" printed to stdout when a file is positively matched. While when the
file name doesn't match the regexp the output seems ok.

C:\>c:\python.exe g:\a.py sample
====> foo - bar.txt , first part is: foo
None
skipping: foo.txt

Instead I expect an output like this one:

C:\>c:\python.exe g:\a.py sample
====> foo - bar.txt , first part is: foo
None
skipping: foo.txt

Could anyone help me to figure out why "None" appears in the putput?

Thanks and regards,
Ale
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From andrej.mitrovich at gmail.com  Sun Mar 21 14:14:16 2010
From: andrej.mitrovich at gmail.com (Andrej Mitrovic)
Date: Sun, 21 Mar 2010 11:14:16 -0700 (PDT)
Subject: Python Documentation website layout changed?
References: <21fcbd63-fd1e-4b53-89b3-393c15591372@m37g2000yqf.googlegroups.com>
	<27c7e0a7-5a26-40f2-94ba-0af9cb530d67@g28g2000yqh.googlegroups.com> 
	<4BA120A9.3060001@holdenweb.com>
	<mailman.992.1269041589.23598.python-list@python.org>
Message-ID: <3116d122-3a7e-47d6-9bc9-574825ac7391@q23g2000yqd.googlegroups.com>

On Mar 20, 12:32?am, Steve Holden <st... at holdenweb.com> wrote:
> Steve Holden wrote:
> > Andrej Mitrovic wrote:
> >> On Mar 17, 6:41 pm, Andrej Mitrovic <andrej.mitrov... at gmail.com>
> >> wrote:
> >>> Hi,
>
> >>> What happened to the sidebar on the left of the documentation website?
> >>> It seems to be gone:
>
> >>>http://docs.python.org/py3k/index.html
>
> >>> I found it quite useful since I can quickly swap between Python2/3
> >>> documentation, and between other parts of the documentation as well.
> >> Edit: It looks like only the Python 3 pages are affected, the Python 2
> >> pages are the same as before:
>
> >>http://docs.python.org/index.html
>
> >> Might be a bug?
>
> > I'll ask. Georg - is this known behavior or a temporary problem?
>
> It's a bug. Georg is on it.
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ? ? +1 571 484 6266 ? +1 800 494 3119
> See PyCon Talks from Atlanta 2010 ?http://pycon.blip.tv/
> Holden Web LLC ? ? ? ? ? ? ? ?http://www.holdenweb.com/
> UPCOMING EVENTS: ? ? ? ?http://holdenweb.eventbrite.com/

Looks like it's fixed now. Thanks Georg & Steve!


From steve at REMOVE-THIS-cybersource.com.au  Sun Mar 21 14:18:57 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 21 Mar 2010 18:18:57 GMT
Subject: How to automate accessor definition?
References: <ho3heq$61v$1@reader1.panix.com>
	<639908184290880449.447600deets-nospam.web.de@news.hansenet.de>
	<ho5j64$22l$1@reader1.panix.com>
Message-ID: <4ba66311$0$27838$c3e8da3@news.astraweb.com>

On Sun, 21 Mar 2010 16:57:40 +0000, kj wrote:

> Just accessing attributes looks a bit dangerous to me, due to bugs like
> typing
> 
>   i.typo = 'foo'
> 
> when what you meant is
> 
>   i.type = 'foo'

That's the price you pay for using a dynamic language like Python with no 
declarations. But honestly, the price isn't very high, particularly if 
you use an editor or IDE with auto-completion. I can't think of the last 
time I had an error due to the above sort of mistake.

Besides, is that error really so much more likely than this?

    i.type = 'fpo'

when you meant 'foo'? The compiler can't protect you from that error, not 
in any language.


> I tried fixing this by mucking with __setattr__, but I didn't hit on a
> satisfactory solution (basically, I couldn't find a good,
> self-maintaining, way to specify the attributes that were OK to set from
> those that weren't).  Is there anything built-in?

No.

You could abuse __slots__, but it really is abuse: __slots__ are a memory 
optimization, not a typo-checker.

In Python 3.x, you can (untested) replace the class __dict__ with a 
custom type that has more smarts. At the cost of performance. This 
doesn't work in 2.x though, as the class __dict__ is always a regular 
dictionary.

Something like this might work, at some minor cost of performance:

# Untested
def __setattr__(self, name, value):
    if hasattr(self, name):
        super(MyClassName, self).__setattr__(name, value)
    else:
        raise TypeError('cannot create new attributes')

Then, in your __init__ method, to initialise an attribute use:

    self.__dict__['attr'] = value

to bypass the setattr.


Or you can use something like PyChecker or PyLint to analyse your code 
and warm about likely typos.

But really, it's not a common form of error. YMMV.



> Regarding properties, is there a built-in way to memoize them? For
> example, suppose that the value of a property is obtained by parsing the
> contents of a file (specified in another instance attribute). It would
> make no sense to do this parsing more than once.  Is there a standard
> idiom for memoizing the value once it is determined for the first time?

Google for "Python memoization cookbook". This will get you started:

http://code.activestate.com/recipes/52201/

Then just apply the memoize decorator to the property getter.




-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sun Mar 21 14:26:59 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 21 Mar 2010 18:26:59 GMT
Subject: Regexp problem when parsing a string
References: <mailman.1031.1269195140.23598.python-list@python.org>
Message-ID: <4ba664f3$0$27838$c3e8da3@news.astraweb.com>

On Sun, 21 Mar 2010 19:12:18 +0100, Alessandro Marino wrote:

> Could anyone help me to figure out why "None" appears in the putput?

I get:

"Attachment not shown: MIME type application/octet-stream; filename a.py"

Posting attachments to Usenet is tricky. Many newsgroups filter out 
anything they think isn't text, or even any attachment at all. Some news 
clients do the same thing.

If you have too much code to include directly in your post, then you 
should put it up on a website somewhere and just include the link.

Without looking at your code, I'd guess that using regular expressions is 
the wrong approach. Perhaps you should look at the glob module, and 
possibly os.walk.



-- 
Steven


From python at mrabarnett.plus.com  Sun Mar 21 14:31:31 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Sun, 21 Mar 2010 18:31:31 +0000
Subject: Regexp problem when parsing a string
In-Reply-To: <9b9cf8321003211112q2333fb74h29e9a805053d1a13@mail.gmail.com>
References: <9b9cf8321003211112q2333fb74h29e9a805053d1a13@mail.gmail.com>
Message-ID: <4BA66603.1010303@mrabarnett.plus.com>

Alessandro Marino wrote:
> I'm a beginner and I was trying to write a program to 
> parse recursively all file names in a directory specified as parameter. 
> The problem is that I get a "None" printed to stdout when a file is 
> positively matched. While when the file name doesn't match the regexp 
> the output seems ok. 
> 
> C:\>c:\python.exe g:\a.py sample
> ====> foo - bar.txt , first part is: foo
> None
> skipping: foo.txt
> 
> Instead I expect an output like this one:
> 
> C:\>c:\python.exe g:\a.py sample
> ====> foo - bar.txt , first part is: foo
> None
> skipping: foo.txt
> 
> Could anyone help me to figure out why "None" appears in the putput?
> 
> Thanks and regards,
> Ale
> 
It's caused by:

     print saveData(file, m)

The function saveData() returns None, which is then printed.


From lists at cheimes.de  Sun Mar 21 14:37:03 2010
From: lists at cheimes.de (Christian Heimes)
Date: Sun, 21 Mar 2010 19:37:03 +0100
Subject: How to automate accessor definition?
In-Reply-To: <ho5k28$jge$1@dough.gmane.org>
References: <ho3heq$61v$1@reader1.panix.com>	<mailman.1018.1269125666.23598.python-list@python.org>	<ho5jf5$22l$2@reader1.panix.com>
	<ho5k28$jge$1@dough.gmane.org>
Message-ID: <ho5p0f$3ni$1@dough.gmane.org>

Steve Holden wrote:
> You may well find that namedtuple is faster than what you put together
> yourself, as the collections module is implemented in C.

But namedtuple isn't, Steve. Namedtuple is a class generator that
creates fast and efficient classes.



From pmaupin at gmail.com  Sun Mar 21 14:40:42 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sun, 21 Mar 2010 11:40:42 -0700 (PDT)
Subject: How to automate accessor definition?
References: <ho3heq$61v$1@reader1.panix.com>
	<639908184290880449.447600deets-nospam.web.de@news.hansenet.de>
	<ho5j64$22l$1@reader1.panix.com>
Message-ID: <7938941f-8d42-4b46-8b68-8f28c95df0c7@e1g2000yqh.googlegroups.com>

On Mar 21, 11:57?am, kj <no.em... at please.post> wrote:
>
> Just accessing attributes looks a bit dangerous to me, due to bugs
> like typing
>
> ? i.typo = 'foo'
>
> when what you meant is
>
> ? i.type = 'foo'
>
> I tried fixing this by mucking with __setattr__, but I didn't hit
> on a satisfactory solution (basically, I couldn't find a good,
> self-maintaining, way to specify the attributes that were OK to
> set from those that weren't). ?Is there anything built-in?
>

If you *really* want static typing and validation for attributes in
Python, you might check out enthought traits:  http://code.enthought.com/projects/traits/

Regards,
Pat


From steve at holdenweb.com  Sun Mar 21 14:47:32 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 21 Mar 2010 14:47:32 -0400
Subject: How to automate accessor definition?
In-Reply-To: <ho5p0f$3ni$1@dough.gmane.org>
References: <ho3heq$61v$1@reader1.panix.com>	<mailman.1018.1269125666.23598.python-list@python.org>	<ho5jf5$22l$2@reader1.panix.com>	<ho5k28$jge$1@dough.gmane.org>
	<ho5p0f$3ni$1@dough.gmane.org>
Message-ID: <ho5pkn$679$1@dough.gmane.org>

Christian Heimes wrote:
> Steve Holden wrote:
>> You may well find that namedtuple is faster than what you put together
>> yourself, as the collections module is implemented in C.
> 
> But namedtuple isn't, Steve. Namedtuple is a class generator that
> creates fast and efficient classes.
> 
Ah, right, thanks.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From aonlazio at gmail.com  Sun Mar 21 14:52:36 2010
From: aonlazio at gmail.com (AON LAZIO)
Date: Sun, 21 Mar 2010 14:52:36 -0400
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" 
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN 
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
Message-ID: <f9e39bbc1003211152j3a43c520qa6596bebac9a6379@mail.gmail.com>

Relax guys, let have fun once in a while


On Sat, Mar 20, 2010 at 12:18 AM, Naeem <kse.listed.co1 at gmail.com> wrote:

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> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD""EURO GIRLS" "MISS
> EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" "SEXY FRENCH GIRLS" on
> www.sexyandpretty-girls.blogspot.com       "SEXY RUSSIAN GIRLS" "SEXY
> GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY HOLLYWOOD GIRLS"
> "SEXY BOLLYWOOD""EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
> "PRETTY GIRLS" "SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com
> "SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
> GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
Passion is my style
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From steve at holdenweb.com  Sun Mar 21 15:01:53 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 21 Mar 2010 15:01:53 -0400
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS"
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <f9e39bbc1003211152j3a43c520qa6596bebac9a6379@mail.gmail.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<f9e39bbc1003211152j3a43c520qa6596bebac9a6379@mail.gmail.com>
Message-ID: <ho5qfj$8dc$1@dough.gmane.org>

AON LAZIO wrote:
> Relax guys, let have fun once in a while
> 
[further repetition of the spamming URLs]

facepalm.
> 
> 
> -- 
> Passion is my style
> 
Style? You call that style?

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From Brian.Mingus at Colorado.EDU  Sun Mar 21 15:11:29 2010
From: Brian.Mingus at Colorado.EDU (Brian J Mingus)
Date: Sun, 21 Mar 2010 13:11:29 -0600
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" 
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN 
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <cd6401a1003210955u3678ad25y2d6b3f549a24cc03@mail.gmail.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com> 
	<c9d33c541003201155j4150a3a0y503d97e311618e92@mail.gmail.com> 
	<9839a05c1003201227o5112a1f1i9de3a77ba7c613ab@mail.gmail.com> 
	<cd6401a1003210955u3678ad25y2d6b3f549a24cc03@mail.gmail.com>
Message-ID: <9839a05c1003211211u2fd34964i33f8328b61bab3e8@mail.gmail.com>

On Sun, Mar 21, 2010 at 10:55 AM, Zooko O'Whielacronx <zookog at gmail.com>wrote:

> On Sat, Mar 20, 2010 at 1:27 PM, Brian J Mingus
> <Brian.Mingus at colorado.edu> wrote:
> > Moderating this stuff requires moderating all messages.
>
> Not quite. GNU Mailman comes with nice features to ease this task. You
> can configure it so that everyone who is currently subscribed can post
> freely, but new subscribers get a "moderated" bit set on them. The
> first time this new subscriber attempts to post to the list, a human
> moderator has to inspect their message and decide whether to approve
> it or deny it. If they human moderator approves it, they can also on
> the same web form remove the "moderated" bit from that poster.
>
> Therefore, the volunteer work required would be inspecting the *first*
> post from each *new* subscriber to see if that post is spam.
>
> Regards,
>
> Zooko
>

I like this approach, but I like even better simply disabling the usenet
gateway. I can't find the message now but someone mentioned it would almost
completely get rid of the spam problem. I disagree with Steve Holden that
since it's only ~1% we should just ignore it.
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From clp2 at rebertia.com  Sun Mar 21 15:57:50 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Sun, 21 Mar 2010 12:57:50 -0700
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS" 
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN 
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <ho5qfj$8dc$1@dough.gmane.org>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<f9e39bbc1003211152j3a43c520qa6596bebac9a6379@mail.gmail.com>
	<ho5qfj$8dc$1@dough.gmane.org>
Message-ID: <50697b2c1003211257i3b674a20ib3d335d465e9639@mail.gmail.com>

On Sun, Mar 21, 2010 at 12:01 PM, Steve Holden <steve at holdenweb.com> wrote:
> AON LAZIO wrote:
>> Relax guys, let have fun once in a while
>>
> [further repetition of the spamming URLs]
>
> facepalm.

Fortunately, Google has now shut down the spam blog anyway.

Cheers,
Chris


From omrihsan at gmail.com  Sun Mar 21 16:44:49 2010
From: omrihsan at gmail.com (Omer Ihsan)
Date: Sun, 21 Mar 2010 13:44:49 -0700 (PDT)
Subject: device identification
Message-ID: <9c7ed2c8-f04b-4302-a4be-bde1628ef966@y11g2000prf.googlegroups.com>

i have installed pyusb now and run the sample usbenum.py....i have 3
usb ports on my PC but the results show 6 outputs to
dev.filename..they are numbers like 001 or 005 etc.... and they
changed when i plugged in devices...(i am no good with the usb
standards)....i just want to identify each device/port... what
parameter in the example would help me....



From darcy at druid.net  Sun Mar 21 17:00:06 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Sun, 21 Mar 2010 17:00:06 -0400
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH"
	"PRETTY GIRLS" "SEXY FRENCH GIRLS" on
	www.sexyandpretty-girls.blogspot.com
	"SEXY RUSSIAN GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK
	GIRLS" "SEXY HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <50697b2c1003211257i3b674a20ib3d335d465e9639@mail.gmail.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>
	<f9e39bbc1003211152j3a43c520qa6596bebac9a6379@mail.gmail.com>
	<ho5qfj$8dc$1@dough.gmane.org>
	<50697b2c1003211257i3b674a20ib3d335d465e9639@mail.gmail.com>
Message-ID: <20100321170006.03056484.darcy@druid.net>

On Sun, 21 Mar 2010 12:57:50 -0700
Chris Rebert <clp2 at rebertia.com> wrote:
> Fortunately, Google has now shut down the spam blog anyway.

Until next time.

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


From aahz at pythoncraft.com  Sun Mar 21 17:34:28 2010
From: aahz at pythoncraft.com (Aahz)
Date: 21 Mar 2010 14:34:28 -0700
Subject: Method / Functions - What are the differences?
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4B8EF717.3070701@optimum.net> <
	<mailman.555.1268232321.23598.python-list@python.org>
Message-ID: <ho63d4$2ta$1@panix5.panix.com>

In article <mailman.555.1268232321.23598.python-list at python.org>,
John Posner  <jjposner at optimum.net> wrote:
>
>Bruno (and anyone else interested) --
>
>As I promised/threatened, here's the *start* of a write-up on 
>properties, aimed at non-advanced Python programmers:
>
>   http://www.jjposner.net/media/python-properties-0310.pdf

I'm interested, but not interested enough to download a PDF and fire up
a PDF reader.  Are you really using features that require PDF instead of
just writing a web page?
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

"Many customs in this life persist because they ease friction and promote
productivity as a result of universal agreement, and whether they are
precisely the optimal choices is much less important." --Henry Spencer


From tjreedy at udel.edu  Sun Mar 21 18:00:59 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 21 Mar 2010 18:00:59 -0400
Subject: How to keep effects of image filters going for some seconds?
In-Reply-To: <b151eeba-1e33-4f9e-b6c4-678af8cc5540@v20g2000prc.googlegroups.com>
References: <b151eeba-1e33-4f9e-b6c4-678af8cc5540@v20g2000prc.googlegroups.com>
Message-ID: <ho64uu$bv7$1@dough.gmane.org>

On 3/21/2010 3:23 AM, Ren Wenshan wrote:
> Hello, every pythoner.
>
> Firstly, I want to mention that English is my second language, so
> maybe there are some sentences which makes you confused, sorry.
>
> I have been learning Panda3D, an open source 3D engine, these days.
> Now, I'm trying to write a small game for fun and practice. However,
> I've ran into a problem.
>
> I want to make some speical effects and there is my code:
>
> def ventose(self):
>
>      global potato_HP
>
>      if potato_HP[0] == 1 and potato_HP[1] == 0:
>      if random()>  .30:
>          self.filters.setCartoonInk(separation = 0.8)
>          self.robotVincent.resetHead.start()
>          self.decreaseVincentHP()
>              Wait(3)
>              self.fliters.delCartoonInk()
>
> However, it doesn't work, the CartoonInk effect will never been shown
> in my game and I don't want my game to wait three seconds, what I need
> is to keep the effect for a period of time while the game run as well.

The generic answer is to turn CartoonInk on and set a timed event for 
now+ 3 secs to turn it off. You will have to understand how to interact 
with the Panda event loop. For a more specific answer, follow Donn's 
advice -- Panda forum. I know there was one when I looked at Panda a 
year ago.

> Besides that, I also want to show a counting back like "3", then "2",
> then "1", finally "Go".

Ok, instead to events set 1 sec in future.

Terry Jan Reedy



From tjreedy at udel.edu  Sun Mar 21 18:06:05 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 21 Mar 2010 18:06:05 -0400
Subject: "EURO GIRLS" "MISS EUROPE" "MISS FRENCH" "FRENCH" "PRETTY GIRLS"
	"SEXY FRENCH GIRLS" on www.sexyandpretty-girls.blogspot.com "SEXY
	RUSSIAN
	GIRLS" "SEXY GREEK GIRLS" "SEXY DUTCH GIRLS" "SEXY UK GIRLS" "SEXY
	HOLLYWOOD GIRLS" "SEXY BOLLYWOOD"
In-Reply-To: <cd6401a1003210955u3678ad25y2d6b3f549a24cc03@mail.gmail.com>
References: <6abd158d-aba6-4ea1-9d9d-015472cc36f6@t9g2000prh.googlegroups.com>	<9839a05c1003192141u360ff77bx8bd0e063c345055e@mail.gmail.com>	<c9d33c541003201155j4150a3a0y503d97e311618e92@mail.gmail.com>	<9839a05c1003201227o5112a1f1i9de3a77ba7c613ab@mail.gmail.com>
	<cd6401a1003210955u3678ad25y2d6b3f549a24cc03@mail.gmail.com>
Message-ID: <ho658a$bv7$2@dough.gmane.org>

On 3/21/2010 12:55 PM, Zooko O'Whielacronx wrote:
> On Sat, Mar 20, 2010 at 1:27 PM, Brian J Mingus
> <Brian.Mingus at colorado.edu>  wrote:
>> Moderating this stuff requires moderating all messages.
>
> Not quite. GNU Mailman comes with nice features to ease this task. You
> can configure it so that everyone who is currently subscribed can post
> freely, but new subscribers get a "moderated" bit set on them. The
> first time this new subscriber attempts to post to the list, a human
> moderator has to inspect their message and decide whether to approve
> it or deny it. If they human moderator approves it, they can also on
> the same web form remove the "moderated" bit from that poster.
>
> Therefore, the volunteer work required would be inspecting the *first*
> post from each *new* subscriber to see if that post is spam.

The first time I post to *any* mailing list from gmane, gmane holds the 
message until I respond to an email. So python-list could pass new posts 
from gmane while at least auto-querying anything from google.



From tjreedy at udel.edu  Sun Mar 21 18:10:44 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 21 Mar 2010 18:10:44 -0400
Subject: [RELEASED] Python 3.1.2
In-Reply-To: <1afaf6161003211012r30bc0e77ub5dfe9f248668525@mail.gmail.com>
References: <1afaf6161003211012r30bc0e77ub5dfe9f248668525@mail.gmail.com>
Message-ID: <ho65h1$bv7$3@dough.gmane.org>

On 3/21/2010 1:12 PM, Benjamin Peterson wrote:
> On behalf of the Python development team, I'm joyful to announce the second
> bugfix release of the Python 3.1 series, Python 3.1.2.

Thanks for the work.

> This bug fix release fixes numerous issues found in 3.1.1, and is considered a
> production release.
>
> The Python 3.1 version series focuses on the stabilization and optimization of
> the features and changes that Python 3.0 introduced.  For example, the new I/O
> system has been rewritten in C for speed.  File system APIs that use unicode
> strings now handle paths with undecodable bytes in them. Other features include
> an ordered dictionary implementation, a condensed syntax for nested with
> statements, and support for ttk Tile in Tkinter.  For a more extensive list of
> changes in 3.1, see http://doc.python.org/3.1/whatsnew/3.1.html or Misc/NEWS in
> the Python distribution.
>
> To download Python 3.1.2 visit:
>
>       http://www.python.org/download/releases/3.1.2/
>
> A list of changes in 3.1.2 can be found here:
>
>       http://svn.python.org/projects/python/tags/r312/Misc/NEWS

There seem to be about a hundred fixes.

> The 3.1 documentation can be found at:
>
>       http://docs.python.org/3.1
>
> Bugs can always be reported to:
>
>       http://bugs.python.org



From steve at holdenweb.com  Sun Mar 21 18:44:11 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 21 Mar 2010 18:44:11 -0400
Subject: Method / Functions - What are the differences?
In-Reply-To: <ho63d4$2ta$1@panix5.panix.com>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>	<4B8EF717.3070701@optimum.net>
	<	<mailman.555.1268232321.23598.python-list@python.org>
	<ho63d4$2ta$1@panix5.panix.com>
Message-ID: <ho67gh$in1$1@dough.gmane.org>

Aahz wrote:
> In article <mailman.555.1268232321.23598.python-list at python.org>,
> John Posner  <jjposner at optimum.net> wrote:
>> Bruno (and anyone else interested) --
>>
>> As I promised/threatened, here's the *start* of a write-up on 
>> properties, aimed at non-advanced Python programmers:
>>
>>   http://www.jjposner.net/media/python-properties-0310.pdf
> 
> I'm interested, but not interested enough to download a PDF and fire up
> a PDF reader.  Are you really using features that require PDF instead of
> just writing a web page?

For us standard browser users it's a single click, of course.

Are you really forced to use an environment that can't start a PDF
reader by clicking on a link?

I appreciate that some people are disabled in ways that rule out reading
a PDF, but since John has gone to some personal trouble to write this
document he's surely entitled to choose his medium ...

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From janssen at parc.xerox.com  Sun Mar 21 18:50:13 2010
From: janssen at parc.xerox.com (Bill Janssen)
Date: Sun, 21 Mar 2010 15:50:13 PDT
Subject: using Python distutils bdist_msi to create installer for large
	complicated package
Message-ID: <61250.1269211813@parc.com>

Martin,

I've been re-thinking the UpLib Windows installer technology, and it
occurred to me to wonder why I can't just use the nice bdist_msi module
in Python to build my packages.  I took a look, and it seems almost
doable.  Presumably you wrote it?

UpLib is a big package, with lots of Python and Java and C programs, and
for Windows I package it with lots of other programs like those from
xpdf.  All of this is installed in C:\Program Files\UpLib\VERSION\, in
bin, lib, share, and so forth subdirectories.  If I autogenerated a
setup.py file which described everything as "data_files", it should be
simple to package everything up in a Cab, and bdist_msi apparently also
provides the ability to add pre- and post-install scripts.  Everything
I need, really.

There are a couple of Python-specific options in the code: the "Product
Name" is prefixed with the python version, and in the GUI, the default
location is the location of a Python distro.  If the package had a
"--non-python" option which would defeat these, and perhaps also set
"no-target-optimize" and "no-target-compile" to True, it would be a
simple but pretty general-purpose packager module.

I'll subclass it and play around a bit.

Bill



From ben+python at benfinney.id.au  Sun Mar 21 18:50:58 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Mon, 22 Mar 2010 09:50:58 +1100
Subject: should writing Unicode files be so slow
References: <hnu9gl$fg7e$1@uns-a.ucl.ac.uk> <8739zxw057.fsf@benfinney.id.au>
	<hnvpfj$7k76$1@uns-a.ucl.ac.uk> <87ljdov59q.fsf@benfinney.id.au>
	<ho0bkp$cc3g$1@uns-a.ucl.ac.uk>
	<mailman.993.1269044370.23598.python-list@python.org>
	<ho5ah6$eo6s$1@uns-a.ucl.ac.uk>
Message-ID: <87bpehthkd.fsf@benfinney.id.au>

djc <slais-www at ucl.ac.uk> writes:

> I shall concentrate on finding an optimal time to upgrade from Python
> 2.6.

Note that Python 2.7, though nearly ready, is not yet released
<URL:http://www.python.org/download/releases/>.

-- 
 \            ?? Nature ? is seen to do all things Herself and through |
  `\         herself of own accord, rid of all gods.? ?Titus Lucretius |
_o__)                                                 Carus, c. 40 BCE |
Ben Finney


From martin at v.loewis.de  Sun Mar 21 19:00:30 2010
From: martin at v.loewis.de (=?ISO-8859-1?Q?=22Martin_v=2E_L=F6wis=22?=)
Date: Mon, 22 Mar 2010 00:00:30 +0100
Subject: using Python distutils bdist_msi to create installer for large
	complicated package
In-Reply-To: <61250.1269211813@parc.com>
References: <61250.1269211813@parc.com>
Message-ID: <4BA6A50E.9060108@v.loewis.de>

> I've been re-thinking the UpLib Windows installer technology, and it
> occurred to me to wonder why I can't just use the nice bdist_msi module
> in Python to build my packages.  I took a look, and it seems almost
> doable.  Presumably you wrote it?

Correct.

> UpLib is a big package, with lots of Python and Java and C programs, and
> for Windows I package it with lots of other programs like those from
> xpdf.  All of this is installed in C:\Program Files\UpLib\VERSION\, in
> bin, lib, share, and so forth subdirectories.  If I autogenerated a
> setup.py file which described everything as "data_files", it should be
> simple to package everything up in a Cab, and bdist_msi apparently also
> provides the ability to add pre- and post-install scripts.  Everything
> I need, really.
> 
> There are a couple of Python-specific options in the code: the "Product
> Name" is prefixed with the python version, and in the GUI, the default
> location is the location of a Python distro.  If the package had a
> "--non-python" option which would defeat these, and perhaps also set
> "no-target-optimize" and "no-target-compile" to True, it would be a
> simple but pretty general-purpose packager module.

I'd rather recommend to base this off msilib directly, instead of trying
to subvert bdist_msi to do what you want. There is actually quite a lot
python-specifics in bdist_msi. If you find this too tedious to use,
please propose *base classes* that could become part of msilib, rather
than trying to create *subclasses* of the bdist_msi classes.

Regards,
Martin



From john at castleamber.com  Sun Mar 21 19:10:01 2010
From: john at castleamber.com (John Bokma)
Date: Sun, 21 Mar 2010 17:10:01 -0600
Subject: Method / Functions - What are the differences?
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4B8EF717.3070701@optimum.net>
	<mailman.555.1268232321.23598.python-list@python.org>
	<ho63d4$2ta$1@panix5.panix.com>
Message-ID: <87pr2xjmpi.fsf@castleamber.com>

aahz at pythoncraft.com (Aahz) writes:

> In article <mailman.555.1268232321.23598.python-list at python.org>,
> John Posner  <jjposner at optimum.net> wrote:
>>
>>Bruno (and anyone else interested) --
>>
>>As I promised/threatened, here's the *start* of a write-up on 
>>properties, aimed at non-advanced Python programmers:
>>
>>   http://www.jjposner.net/media/python-properties-0310.pdf
>
> I'm interested, but not interested enough to download a PDF and fire up
> a PDF reader.  Are you really using features that require PDF instead of
> just writing a web page?

http://docs.google.com/viewer?url=http%3A%2F%2Fwww.jjposner.net%2Fmedia%2Fpython-properties-0310.pdf

Hth,

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


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Subject: sell:nike shoes$32,ed hardy(items),jean$30,handbag$35
Message-ID: <e9799560-0693-46ef-9fde-8cc3f5731eea@z3g2000yqz.googlegroups.com>

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From jjposner at optimum.net  Sun Mar 21 19:28:43 2010
From: jjposner at optimum.net (John Posner)
Date: Sun, 21 Mar 2010 19:28:43 -0400
Subject: Method / Functions - What are the differences?
In-Reply-To: <ho63d4$2ta$1@panix5.panix.com>
References: <hmdo3m$287$1@news.urz.uni-heidelberg.de>
	<4B8EF717.3070701@optimum.net> <
	<mailman.555.1268232321.23598.python-list@python.org>
	<ho63d4$2ta$1@panix5.panix.com>
Message-ID: <4BA6ABAB.5060807@optimum.net>

On 3/21/2010 5:34 PM, Aahz wrote:
> In article<mailman.555.1268232321.23598.python-list at python.org>,
> John Posner<jjposner at optimum.net>  wrote:
>>
>> Bruno (and anyone else interested) --
>>
>> As I promised/threatened, here's the *start* of a write-up on
>> properties, aimed at non-advanced Python programmers:
>>
>>    http://www.jjposner.net/media/python-properties-0310.pdf
>
> I'm interested, but not interested enough to download a PDF and fire up
> a PDF reader.  Are you really using features that require PDF instead of
> just writing a web page?


No, I compose text using a WYSIWYG editor, and I assumed that PDF was a 
convenient format for others.

I've been working on the writeup, and marking it up for use on the 
Python Wiki. So I've gone ahead and published it:

  http://wiki.python.org/moin/ComputedAttributesUsingPropertyObjects

For good measure, I've also been working on an updated writeup for 
"property" in the "Built-in Functions" section of the official Python 
docs. A draft is in HTML format at:

  http://cl1p.net/jjp_python_property_ref.html/

Thanks for your interest! All comments are most welcome.

-John




From ldo at geek-central.gen.new_zealand  Sun Mar 21 19:36:35 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Mon, 22 Mar 2010 12:36:35 +1300
Subject: GC is very expensive: am I doing something wrong?
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
	<mailman.963.1268958842.23598.python-list@python.org>
Message-ID: <ho6ai4$b12$2@lust.ihug.co.nz>

In message <mailman.963.1268958842.23598.python-list at python.org>, Terry 
Reedy wrote:

> No one has discovered a setting
> of the internal tuning parameters for which there are no bad patterns
> and I suspect there are not any such. This does not negate Xavier's
> suggestion that a code change might also solve your problem.

Could it be that for implementing a structure like a trie as the OP is, 
where a lot of CPU cycles can be spent manipulating the structure, a high-
level language like Python, Perl or Ruby just gets in the way?

My feeling would be, try to get the language to do as much of the work for 
you as possible. If you can?t do that, then you might be better off with a 
lower-level language.


From twentyqstns at gmail.com  Sun Mar 21 19:47:59 2010
From: twentyqstns at gmail.com (twenty questions)
Date: Sun, 21 Mar 2010 16:47:59 -0700 (PDT)
Subject: add an entry to twentyquestions.org  (please)
Message-ID: <73490ec3-5d3f-417a-b0fc-c697cd0fb08a@30g2000yqi.googlegroups.com>

add an entry to http://www.twentyquestions.org  (please)


From rasky at develer.com  Sun Mar 21 19:50:00 2010
From: rasky at develer.com (Giovanni Bajo)
Date: Mon, 22 Mar 2010 00:50:00 +0100
Subject: [ANN] PyInstaller 1.4
Message-ID: <1269215400.3170.12.camel@ozzu>

Hello,

I'm happy to announce PyInstaller 1.4, the first formal release after
several years of quiet development.

   http://www.pyinstaller.org


=== What it is ===

PyInstaller is a program that converts (packages) Python programs into
stand-alone executables, under Windows, Linux, and Mac OS X. It's
similar to py2exe/py2app, but it is multiplatform and with many advanced
features.

The main goal of PyInstaller is to be compatible with 3rd-party packages
out-of-the-box. This means that, with PyInstaller, all the required
tricks to make external packages work are already integrated within
PyInstaller itself so that there is no user intervention required.
You'll never be required to look for tricks in wikis and apply custom
modification to your files or your setup scripts.

=== Features ===

      * Packaging of Python programs into standard executables, that
        work on computers without Python installed.
      * Multiplatform: works under Windows, Linux and Irix. Experimental
        Mac OS X support available.
      * Multiversion: works under any version of Python from 1.5 up to
        2.6. NOTE: Support for Python 2.6+ on Windows is not included in
        this release yet. Please see this page for a working patch:
        http://www.pyinstaller.org/wiki/Python26Win
      * Flexible packaging mode:
              * Single directory: build a directory containing an
                executable plus all the external binary modules
                (.dll, .pyd, .so) used by the program.
              * Single file: build a single executable file, totally
                self-contained, which runs without any external
                dependency.
              * Custom: you can automate PyInstaller to do whatever
                packaging mode you want through a simple script file in
                Python.
      * Explicit intelligent support for many 3rd-packages (for hidden
        imports, external data files, etc.), to make them work with
        PyInstaller out-of-the-box.
      * Full single-file EGG support: .egg files are automatically
        packaged by PyInstaller as-is, so that all features are
        supported at runtime as well (entry points, etc.).
      * Automatic support for binary libraries used through ctypes (see
        http://www.pyinstaller.org/wiki/CtypesDependencySupport for
        details).
      * Support for automatic binary packing through the well-known UPX
        compressor.
      * Support for code-signing executables on Windows.
      * Optional console mode (see standard output and standard error at
        runtime).
      * Selectable executable icon (Windows only).
      * Fully configurable version resource section in executable
        (Windows only).
      * Support for building COM servers (Windows only).

=== ChangeLog ===

For those already using older versions of PyInstaller, the full
changelog for this release can be found here:

   http://www.pyinstaller.org/browser/tags/1.4/doc/CHANGES.txt


=== Feedback ===

We're eager to listent to your feedback on using PyInstaller:

 Ticketing system: http://www.pyinstaller.org/newticket
 Mailing list: http://groups-beta.google.com/group/PyInstaller



-- 
Giovanni Bajo      ::  Develer S.r.l.
rasky at develer.com  ::  http://www.develer.com

Blog: http://giovanni.bajo.it
Last post: ctypes support in PyInstaller




From janssen at parc.com  Sun Mar 21 19:52:35 2010
From: janssen at parc.com (Bill Janssen)
Date: Sun, 21 Mar 2010 16:52:35 PDT
Subject: using Python distutils bdist_msi to create installer for large
	complicated package
In-Reply-To: <4BA6A50E.9060108@v.loewis.de>
References: <61250.1269211813@parc.com> <4BA6A50E.9060108@v.loewis.de>
Message-ID: <63771.1269215555@parc.com>

Martin v. L?wis <martin at v.loewis.de> wrote:

> > I've been re-thinking the UpLib Windows installer technology, and it
> > occurred to me to wonder why I can't just use the nice bdist_msi module
> > in Python to build my packages.  I took a look, and it seems almost
> > doable.  Presumably you wrote it?
> 
> Correct.
> 
> > UpLib is a big package, with lots of Python and Java and C programs, and
> > for Windows I package it with lots of other programs like those from
> > xpdf.  All of this is installed in C:\Program Files\UpLib\VERSION\, in
> > bin, lib, share, and so forth subdirectories.  If I autogenerated a
> > setup.py file which described everything as "data_files", it should be
> > simple to package everything up in a Cab, and bdist_msi apparently also
> > provides the ability to add pre- and post-install scripts.  Everything
> > I need, really.
> > 
> > There are a couple of Python-specific options in the code: the "Product
> > Name" is prefixed with the python version, and in the GUI, the default
> > location is the location of a Python distro.  If the package had a
> > "--non-python" option which would defeat these, and perhaps also set
> > "no-target-optimize" and "no-target-compile" to True, it would be a
> > simple but pretty general-purpose packager module.
> 
> I'd rather recommend to base this off msilib directly, instead of trying
> to subvert bdist_msi to do what you want.

Yes, that was the first thing I looked at.  But as you've pointed out in
the past, it requires a lot of MSI know-how to use that library
directly.  For a variety of applications, you've already embedded most
if not all of that know-how in the bdist_msi class.  And subclassing
is the indicated way to build on distutils, isn't it?

> There is actually quite a lot python-specifics in bdist_msi.

Well, sort of.  If a setup only references "data_files" -- no Python
packages, no extensions -- it's pretty generic.

The "add_find_python" method seems the most python-specific.  I'd
remove a lot of that in the generic case.  And, of course, modify "run"
so that the product name isn't prefixed with "Python x.y".

> If you find this too tedious to use,
> please propose *base classes* that could become part of msilib, rather
> than trying to create *subclasses* of the bdist_msi classes.

Yes, good idea.  For example, all those panels that are in get_ui
could be added by a InstallerBaseGUI class of some sort.

But still, just a few mods to bdist_msi could go a long way.  For
instance, you've already pulled out "get_installer_filename". I'd add a
similar method, "get_product_name", which would typically just return
the user-specific name, but in the default case could prefix the product
name with Python 2.6.

Bill


From mailers at oranged.to  Sun Mar 21 20:12:00 2010
From: mailers at oranged.to (Jimmy Stewpot)
Date: Mon, 22 Mar 2010 00:12:00 +0000 (UTC)
Subject: Best practise for dual stack programming in python
Message-ID: <58492962.583.1269216720829.JavaMail.root@poops.oranged.to>

Hello,

The organisation that I currently work for has a large number of 'legacy' tools and scripts which rely entirely on IPv4. Many of them have been written and not documented etc. The organisation is in the process of moving to a dual stack environment over the next 3 months. With that in mind many of our scripts need to be rewritten and documented. I have been looking at moving from a mix of languages over to a standard which at this point is looking like it will be Python (because I am most familiar with it). I have never done any dual stack coding so I am interested to know if there are any good resources for developing dual stack python code?

I have had a look around and have found very little on the python web page which makes me worry. Does anyone have any recommendations on web pages to read or books to look at?

Any additional advice would be really appreciated.

Regards,

Jimmy Stewpot. 


From no.email at please.post  Sun Mar 21 21:36:19 2010
From: no.email at please.post (kj)
Date: Mon, 22 Mar 2010 01:36:19 +0000 (UTC)
Subject: How to automate accessor definition?
References: <ho3heq$61v$1@reader1.panix.com>
	<639908184290880449.447600deets-nospam.web.de@news.hansenet.de>
	<ho5j64$22l$1@reader1.panix.com>
	<4ba66311$0$27838$c3e8da3@news.astraweb.com>
Message-ID: <ho6hij$1el$1@reader1.panix.com>

In <4ba66311$0$27838$c3e8da3 at news.astraweb.com> Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:

>Then, in your __init__ method, to initialise an attribute use:

>    self.__dict__['attr'] = value

>to bypass the setattr.

Ah, that's the trick!  Thanks!

~K


From ben+python at benfinney.id.au  Sun Mar 21 21:46:07 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Mon, 22 Mar 2010 12:46:07 +1100
Subject: add an entry to twentyquestions.org  (please)
References: <73490ec3-5d3f-417a-b0fc-c697cd0fb08a@30g2000yqi.googlegroups.com>
Message-ID: <8739ztt9gg.fsf@benfinney.id.au>

twenty questions <twentyqstns at gmail.com> writes:

> add an entry to http://www.twentyquestions.org  (please)

Don't spam groups with your off-topic begging for a closed database silo
(please)

-- 
 \        ?Our nylons cost more than common, but you'll find that they |
  `\                           are best in the long run.? ?shop, Tokyo |
_o__)                                                                  |
Ben Finney


From agoretoy at gmail.com  Sun Mar 21 22:04:15 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Sun, 21 Mar 2010 20:04:15 -0600
Subject: execute bash builtins in python
In-Reply-To: <7f014ea61003171114j60aa2a2co19e138e46ea4ee4d@mail.gmail.com>
References: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com> 
	<mailman.660.1268399795.23598.python-list@python.org>
	<pan.2010.03.17.15.44.34.750000@nowhere.com> 
	<7f014ea61003171114j60aa2a2co19e138e46ea4ee4d@mail.gmail.com>
Message-ID: <c9d33c541003211904s78ab5f70kac5625cbc766f6d7@mail.gmail.com>

Thank you for the great suggestions. Steve Holden that is a good one, I will
try to adapt my application to your suggestion. This way I don't have to
source .bashrc when it could do all that for me including other things that
it does in the background. Thank you so much.

Nobody, I was not aware of that shell arg thing, thank you.

Ipython is ok, but in this case I would have to force another dependency,
which I'm trying to keep those as low as possible for such a small
application. In fact, I'm gonna remove desktopcouch (couchdb) as one of the
deps in the next release of courtesyflush. Expect the next release sometime
late next week, if you interested in the app. find it on launchpad. :)
Enjoy.

Thank you,
-Alex Goretoy
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From tjreedy at udel.edu  Sun Mar 21 22:39:44 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 21 Mar 2010 22:39:44 -0400
Subject: Best practise for dual stack programming in python
In-Reply-To: <58492962.583.1269216720829.JavaMail.root@poops.oranged.to>
References: <58492962.583.1269216720829.JavaMail.root@poops.oranged.to>
Message-ID: <ho6l9g$mac$1@dough.gmane.org>

On 3/21/2010 8:12 PM, Jimmy Stewpot wrote:
> Hello,
>
> The organisation that I currently work for has a large number of
> 'legacy' tools and scripts which rely entirely on IPv4. Many of them
> have been written and not documented etc. The organisation is in the
> process of moving to a dual stack environment over the next 3 months.
> With that in mind many of our scripts need to be rewritten and
> documented. I have been looking at moving from a mix of languages
> over to a standard which at this point is looking like it will be
> Python (because I am most familiar with it). I have never done any
> dual stack coding so I am interested to know if there are any good
> resources for developing dual stack python code? I have had a look
> around and have found very little on the python web page which makes
> me worry. Does anyone have any recommendations on web pages to read
> or books to look at?

There are at least 2 ip address libraries which handle both ip4 and ip6. 
One is Google's package,
http://pypi.python.org/pypi/ipaddr/2.0.0
I forget the name of the other, which covers a bit more than the above 
with a slightly different conceptual model. Would these help.

Terry Jan Reedy



From sam at tregar.com  Sun Mar 21 23:08:36 2010
From: sam at tregar.com (Sam Tregar)
Date: Sun, 21 Mar 2010 23:08:36 -0400
Subject: [ANN] onlinepayment v1.0.0 released
In-Reply-To: <fe3354e51003211630j547007c3k4fda6092d0c66677@mail.gmail.com>
References: <fe3354e51003211630j547007c3k4fda6092d0c66677@mail.gmail.com>
Message-ID: <fe3354e51003212008j7a43c199n9ad6fd0487cebb85@mail.gmail.com>

onlinepayment v1.0.0 - a generic Python API for making online payments

This module provides an API wrapper around a variety of payment
providers.  Using this module you can write code that will work the
same regardless of the payment provider in use.

Examples::

   from onlinepayment import OnlinePayment

   # connect to authorize.net, setup auth with login and key
   auth= { 'login': 'YOUR LOGIN HERE',
           'key':   'YOUR KEY HERE' }

   op = OnlinePayment('authnet', test_mode=True, auth=auth)

   # or for paypal, setup auth with user, pass, vendor and product:
   auth= { 'username': 'YOUR USERNAME HERE',
           'password': 'YOUR PASSWORD HERE',
           'vendor':   'YOUR VENDOR HERE',
           'product':  'YOUR PRODUCT HERE' }

   # connect to PayPal
   op = OnlinePayment('paypal', test_mode=True, auth=auth)

   # charge a card
   try:
       result = op.sale(first_name = 'Joe',
                        last_name  = 'Example',
                        address    = '100 Example Ln.',
                        city       = 'Exampleville',
                        state      = 'NY',
                        zip        = '10001',
                        amount     = '2.00',
                        card_num   = '4007000000027',
                        exp_date   = '0530',
                        card_code  = '1234')

   except conn.TransactionDeclined:
      # do something when the transaction fails

   except conn.CardExpired:
      # tell the user their card is expired

   except conn.ProcessorException:
      # handle all other possible processor-generated exceptions generically

   # examine result, the values returned here are processor-specific
   success  = result.success
   code     = result.code
   message  = result.message
   trans_id = result.trans_id

   # you can get the raw data returned by the underlying processor too
   orig = result.orig

Installation
============

Before you can use this module you must install one or more payment
processors.  To install the PayPal payflowpro package::

  # easy_install pytz
  # easy_install python-payflowpro

To install the zc.authorizedotnet package and the authorize package
(for recurring support)::

  # easy_install zc.authorizedotnet
  # easy_install authorize

If you want authorize.net support you'll need to install a patched
version of zc.ssl.  Hopefully someday this will be released by the
Zope devs, but so far I haven't heard anything back.  Download the
zc.ssl source package from http://pypi.python.org/pypi/zc.ssl/, then
unpack::

  # tar zxvf zc.ssl-1.1.tar.gz
  # cd zc.ssl-1.1

Now download and apply my zc-ssl-timeout.patch::

  # wget
http://python-onlinepayment.googlecode.com/svn/trunk/zc-ssl-timeout.patch
  # patch -p1 < /zc-ssl-timeout.patch

And install the patched module::

  # python setup.py install

(You may also need to edit setup.py and remove the
'ssl-for-setuptools' dependecy.  I did, although it may be a quirk of
my Python install rather than a general problem.)

Once you have a payment processor you can install this module::

  # easy_install onlinepayment

For more information see: http://pypi.python.org/pypi/onlinepayment/1.0.0
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From maymunbeyin at gmail.com  Sun Mar 21 23:45:51 2010
From: maymunbeyin at gmail.com (kuru)
Date: Sun, 21 Mar 2010 20:45:51 -0700 (PDT)
Subject: DreamPie - The Python shell you've always dreamed about!
References: <6c6a96e0-be08-4ec3-a002-0bb9232a8afd@f29g2000yqa.googlegroups.com>
Message-ID: <3c11d8e6-ea2d-43d6-a9c9-5c23a52fba8f@l25g2000yqd.googlegroups.com>

Thanks for the shell. It is nice alternative , however I am not ready
to give up Ipython :)

If the code ends with a comment line your shell is giving an error.

Feature request: It would be nice to have numbered lines in the code
section, it makes it hard to find problem line
Feature request: Loading an actual Python file rather than copy
pasting

keep up the good work


From zookog at gmail.com  Mon Mar 22 01:09:46 2010
From: zookog at gmail.com (Zooko O'Whielacronx)
Date: Sun, 21 Mar 2010 23:09:46 -0600
Subject: StringChain -- a data structure for managing large sequences of 
	chunks of bytes
In-Reply-To: <4b9a00ce$0$27822$c3e8da3@news.astraweb.com>
References: <mailman.646.1268377905.23598.python-list@python.org>
	<4b9a00ce$0$27822$c3e8da3@news.astraweb.com>
Message-ID: <cd6401a1003212209l175f26c8t4a8d924a6f823972@mail.gmail.com>

Folks:

I failed to make something sufficiently clear in my original message
about StringChain. The use case that I am talking about is not simply
that you need to accumulate a sequence of incoming chunks of data,
concatenate them together, and then process the entire result. If that
is all you need to do then indeed you can accumulate the incoming
strings in a list and then run ''.join(thelist) when you have received
all of them and are ready to process them.

But the use case that I am talking about is where you need to
accumulate new incoming strings into your buffer while alternately
processing leading prefixes of the buffer. The typical example is that
sequences of bytes are arriving on your TCP socket and you are
processing the stream incrementally. You need to process the leading
prefixes of the stream as soon as you can (e.g. as soon as a line
followed by a newline has accumulated, or as soon as another complete
element in your data format has accumulated, etc.); you can't simply
wait until the bytes stop coming and then concatenate the entire
collection together at once.

This is exactly the current situation in foolscap [1] which is causing
a performance problem in Tahoe-LAFS [2].

To illustrate what I mean I cooked up some benchmarks showing the task
of "accumulate a bunch of things then consume them in a single gulp"
versus the task of "alternate between accumulating and consuming"
(with accumulation going faster than consumption until the input
stream runs dry).

I implemented a few data structures for benchmarking: StringChain, the
naive "accumulatorstr += newstr" approach (named "Stringy" in the
benchmarks), one based on cStringIO (named "StringIOy"), one based on
accumulating the new strings into a list and then doing
''.join(accumulatorlist) whenever you need to consume a leading prefix
(called "SimplerStringChain").

Below are the abbreviated results of the benchmark. You can easily run
this benchmark yourself by following the README.txt in the StringChain
source package [3]. These results show that for the load imposed by
this benchmark StringChain is the only one of the four that scales and
that it is also nice and fast.

The left-hand column is the total number of bytes that were run
through it. The results are shown in nanoseconds per byte in
exponential notation. ("e+01" means times 10, "e+02" means times 100,
and "e+03" means times 1000, etc.) Each result is the best of 10
tries, or of 5 tries for the tasks which were taking too long to run
it 10 times.

Regards,

Zooko

[1] http://foolscap.lothar.com/trac/ticket/149
[2] http://allmydata.org/pipermail/tahoe-dev/2010-March/004181.html
[3] http://tahoe-lafs.org/trac/stringchain

impl:  StringChain
task:  _accumulate_then_one_gulp
  10000 best: 2.694e+00
  50000 best: 2.742e+00
 100000 best: 2.310e+00
 500000 best: 2.040e+00
1000000 best: 1.988e+00
5000000 best: 2.193e+00

task:  _alternate_str
  10000 best: 6.509e+00
  50000 best: 4.559e+00
 100000 best: 4.308e+00
 500000 best: 4.070e+00
1000000 best: 3.991e+00
5000000 best: 4.000e+00

impl:  SimplerStringChain
task:  _accumulate_then_one_gulp
  10000 best: 1.407e+00
  50000 best: 2.317e+00
 100000 best: 2.012e+00
 500000 best: 1.902e+00
1000000 best: 1.897e+00
5000000 best: 2.104e+00

task:  _alternate_str
  10000 best: 4.888e+00
  50000 best: 5.198e+00
 100000 best: 1.750e+01
 500000 best: 6.233e+01
1000000 best: 1.134e+02
5000000 best: 7.599e+02

impl:  StringIOy
task:  _accumulate_then_one_gulp
  10000 best: 4.196e+00
  50000 best: 5.522e+00
 100000 best: 4.499e+00
 500000 best: 3.756e+00
1000000 best: 4.176e+00
5000000 best: 5.414e+00

task:  _alternate_str
  10000 best: 5.484e+00
  50000 best: 7.863e+00
 100000 best: 2.126e+01
 500000 best: 6.972e+01
1000000 best: 1.219e+02
5000000 best: 9.463e+02

task:  _accumulate_then_one_gulp
  10000 best: 1.502e+00
  50000 best: 1.420e+01
 100000 best: 2.245e+01
 500000 best: 8.577e+01
1000000 best: 2.295e+02
5000000 best: 1.326e+03

task:  _alternate_str
  10000 best: 3.290e+00
  50000 best: 4.220e+00
 100000 best: 1.665e+01
 500000 best: 6.281e+01
1000000 best: 1.127e+02
5000000 best: 7.626e+02


From mws42262 at yahoo.com  Mon Mar 22 01:29:57 2010
From: mws42262 at yahoo.com (sam)
Date: Sun, 21 Mar 2010 22:29:57 -0700 (PDT)
Subject: ------->>>FREE MAC<<<-------
Message-ID: <26c5c978-e176-4ff4-afb5-68eef6c466b7@33g2000yqj.googlegroups.com>

http://michellemichaeldiscounts.com/16801.html


From aram1980 at gmail.com  Mon Mar 22 03:22:01 2010
From: aram1980 at gmail.com (Aram Ter-Sarkissov)
Date: Mon, 22 Mar 2010 00:22:01 -0700 (PDT)
Subject: nonuniform sampling with replacement
References: <0c333952-2150-4207-90e8-7bb3f2bc7c4c@b9g2000pri.googlegroups.com>
	<ho51tp$g6f$1@news.eternal-september.org>
	<ho53d3$o12$1@news.eternal-september.org>
Message-ID: <a06b5f5d-f612-47d5-b32d-3fe2102b2c2f@z1g2000prc.googlegroups.com>

On 22 ???, 01:28, "Alf P. Steinbach" <al... at start.no> wrote:
> * Alf P. Steinbach:
>
>
>
> > * Jah_Alarm:
> >> I've got a vector length n of integers (some of them are repeating),
> >> and I got a selection probability vector of the same length. How will
> >> I sample with replacement k (<=n) values with the probabilty vector.
> >> In Matlab this function is randsample. I couldn't find anything to
> >> this extent in Scipy or Numpy.
>
> > <code>
> [snip]
> > </code>
>
> > Disclaimer: I just cooked it up and just cooked up binary searches
> > usually have bugs. They usually need to be exercised and fixed. But I
> > think you get the idea. Note also that division differs in Py3 and Py2.
> > This is coded for Py3.
>
> Sorry, I realized this just now: the name "p" in the choice() method is utterly
> misleading, which you can see from the call; it's a random number not a
> probability. I guess my fingers just repeated what they typed earlier.
>
> Cheeers,
>
> - Alf (repeat typist)

thanks a lot

alex


From aram1980 at gmail.com  Mon Mar 22 03:24:16 2010
From: aram1980 at gmail.com (Aram Ter-Sarkissov)
Date: Mon, 22 Mar 2010 00:24:16 -0700 (PDT)
Subject: nonuniform sampling with replacement
References: <0c333952-2150-4207-90e8-7bb3f2bc7c4c@b9g2000pri.googlegroups.com>
	<ho53bu$eeh$03$1@news.t-online.com>
Message-ID: <db3688ad-5473-4c86-918b-c9aa58570578@b9g2000pri.googlegroups.com>

On 22 ???, 01:27, Peter Otten <__pete... at web.de> wrote:
> Jah_Alarm wrote:
> > I've got a vector length n of integers (some of them are repeating),
> > and I got a selection probability vector of the same length. How will
> > I sample with replacement k (<=n) values with the probabilty vector.
> > In Matlab this function is randsample. I couldn't find anything to
> > this extent in Scipy or Numpy.
>
> If all else fails you can do it yourself:
>
> import random
> import bisect
>
> def iter_sample_with_replacement(values, weights):
> ? ? _random = random.random
> ? ? _bisect = bisect.bisect
>
> ? ? acc_weights = []
> ? ? sigma = 0
> ? ? for w in weights:
> ? ? ? ? sigma += w
> ? ? ? ? acc_weights.append(sigma)
> ? ? while 1:
> ? ? ? ? yield values[_bisect(acc_weights, _random()*sigma)]
>
> def sample_with_replacement(k, values, weights):
> ? ? return list(islice(iter_sample_with_replacement(values, weights), k))
>
> if __name__ == "__main__":
> ? ? from itertools import islice
> ? ? N = 10**6
> ? ? values = range(4)
> ? ? weights = [2, 3, 4, 1]
>
> ? ? histo = [0] * len(values)
> ? ? for v in islice(iter_sample_with_replacement(values, weights), N):
> ? ? ? ? histo[v] += 1
> ? ? print histo
> ? ? print sample_with_replacement(30, values, weights)
>
> Peter

thanks a lot,

Alex


From agoretoy at gmail.com  Mon Mar 22 03:32:36 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Mon, 22 Mar 2010 01:32:36 -0600
Subject: execute bash builtins in python
In-Reply-To: <c9d33c541003211904s78ab5f70kac5625cbc766f6d7@mail.gmail.com>
References: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com> 
	<mailman.660.1268399795.23598.python-list@python.org>
	<pan.2010.03.17.15.44.34.750000@nowhere.com> 
	<7f014ea61003171114j60aa2a2co19e138e46ea4ee4d@mail.gmail.com> 
	<c9d33c541003211904s78ab5f70kac5625cbc766f6d7@mail.gmail.com>
Message-ID: <c9d33c541003220032j610a5339l7a502abd5389c141@mail.gmail.com>

I do have a problem however that I don't know how to solve. My application
dies abruptly at random times because of this and I get this output error in
the terminal:

bash: line 0: declare: write error: Broken pipe

and sometimes it crashes and I get this output error; this one maybe gtk
related, yes?

*** glibc detected *** /usr/bin/python: double free or corruption (fasttop):
0xb650fa78 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6[0x17aff1]
/lib/tls/i686/cmov/libc.so.6[0x17c6f2]
/lib/tls/i686/cmov/libc.so.6(cfree+0x6d)[0x17f7cd]
/lib/libglib-2.0.so.0(g_free+0x36)[0x7a3196]
/usr/lib/libgdk-x11-2.0.so.0[0x27faba]
/usr/lib/libgdk-x11-2.0.so.0(gdk_region_union+0x8e)[0x28129e]
/usr/lib/libgdk-x11-2.0.so.0[0x28e26c]
/usr/lib/libgdk-x11-2.0.so.0(gdk_window_invalidate_maybe_recurse+0x243)[0x28eb33]
/usr/lib/libgdk-x11-2.0.so.0(gdk_window_invalidate_maybe_recurse+0x206)[0x28eaf6]
/usr/lib/libgtk-x11-2.0.so.0[0x28b5893]
/usr/lib/libgtk-x11-2.0.so.0[0x28b6cff]
/usr/lib/libgtk-x11-2.0.so.0(gtk_widget_queue_resize+0x75)[0x28bcaa5]
/usr/lib/libgtk-x11-2.0.so.0[0x288b557]
/usr/lib/libgobject-2.0.so.0(g_cclosure_marshal_VOID__BOXED+0x88)[0x320068]
/usr/lib/libgobject-2.0.so.0(g_closure_invoke+0x1b2)[0x313072]
/usr/lib/libgobject-2.0.so.0[0x3287a8]
/usr/lib/libgobject-2.0.so.0(g_signal_emit_valist+0x7bd)[0x329b2d]
/usr/lib/libgobject-2.0.so.0(g_signal_emit+0x26)[0x329fb6]
/usr/lib/libgtk-x11-2.0.so.0(gtk_tree_model_row_deleted+0x9a)[0x28751da]
/usr/lib/libgtk-x11-2.0.so.0(gtk_list_store_remove+0x114)[0x278e9e4]
/usr/lib/libgtk-x11-2.0.so.0(gtk_list_store_clear+0x90)[0x278eab0]
/usr/lib/pymodules/python2.6/gtk-2.0/gtk/_gtk.so[0x10b64a1]
/usr/bin/python(PyEval_EvalFrameEx+0x4175)[0x80dbfd5]
/usr/bin/python(PyEval_EvalFrameEx+0x5524)[0x80dd384]
/usr/bin/python(PyEval_EvalCodeEx+0x7d2)[0x80dddf2]
/usr/bin/python[0x816014c]
/usr/bin/python(PyObject_Call+0x4a)[0x806120a]
/usr/bin/python[0x80684ac]
/usr/bin/python(PyObject_Call+0x4a)[0x806120a]
/usr/bin/python(PyEval_CallObjectWithKeywords+0x42)[0x80d6ef2]
/usr/bin/python(PyObject_CallObject+0x20)[0x80612a0]
/usr/lib/pymodules/python2.6/gtk-2.0/gobject/_gobject.so[0xd4503e]
/usr/lib/libgobject-2.0.so.0(g_closure_invoke+0x1b2)[0x313072]
/usr/lib/libgobject-2.0.so.0[0x3287a8]
/usr/lib/libgobject-2.0.so.0(g_signal_emit_valist+0x7bd)[0x329b2d]
/usr/lib/libgobject-2.0.so.0(g_signal_emit+0x26)[0x329fb6]
/usr/lib/libgtk-x11-2.0.so.0[0x26fb8dc]
/usr/lib/libgobject-2.0.so.0(g_cclosure_marshal_VOID__BOXED+0x88)[0x320068]
/usr/lib/libgobject-2.0.so.0(g_closure_invoke+0x1b2)[0x313072]
/usr/lib/libgobject-2.0.so.0[0x3287a8]
/usr/lib/libgobject-2.0.so.0(g_signal_emit_valist+0x7bd)[0x329b2d]
/usr/lib/libgobject-2.0.so.0(g_signal_emit+0x26)[0x329fb6]
/usr/lib/libgtk-x11-2.0.so.0(gtk_tree_model_row_deleted+0x9a)[0x28751da]
/usr/lib/libgtk-x11-2.0.so.0(gtk_list_store_remove+0x114)[0x278e9e4]
/usr/lib/libgtk-x11-2.0.so.0(gtk_list_store_clear+0x90)[0x278eab0]
/usr/lib/pymodules/python2.6/gtk-2.0/gtk/_gtk.so[0x10b64a1]
/usr/bin/python(PyEval_EvalFrameEx+0x4175)[0x80dbfd5]
/usr/bin/python(PyEval_EvalFrameEx+0x5524)[0x80dd384]
/usr/bin/python[0x815de2f]
/usr/bin/python(PyEval_EvalFrameEx+0x95f)[0x80d87bf]
/usr/bin/python(PyEval_EvalCodeEx+0x7d2)[0x80dddf2]
/usr/bin/python[0x816022f]
/usr/bin/python(PyObject_Call+0x4a)[0x806120a]
/usr/bin/python(PyEval_EvalFrameEx+0x30b9)[0x80daf19]
/usr/bin/python(PyEval_EvalFrameEx+0x5524)[0x80dd384]
/usr/bin/python(PyEval_EvalFrameEx+0x5524)[0x80dd384]
/usr/bin/python(PyEval_EvalCodeEx+0x7d2)[0x80dddf2]
/usr/bin/python[0x816014c]
/usr/bin/python(PyObject_Call+0x4a)[0x806120a]
/usr/bin/python[0x80684ac]
/usr/bin/python(PyObject_Call+0x4a)[0x806120a]
/usr/bin/python(PyEval_CallObjectWithKeywords+0x42)[0x80d6ef2]
/usr/bin/python[0x8107d88]
======= Memory map: ========
00110000-0024e000 r-xp 00000000 08:06 688127     /lib/tls/i686/cmov/
libc-2.10.1.so
0024e000-0024f000 ---p 0013e000 08:06 688127     /lib/tls/i686/cmov/
libc-2.10.1.so
0024f000-00251000 r--p 0013e000 08:06 688127     /lib/tls/i686/cmov/
libc-2.10.1.so
00251000-00252000 rw-p 00140000 08:06 688127     /lib/tls/i686/cmov/
libc-2.10.1.so
00252000-00255000 rw-p 00000000 00:00 0
00255000-002e7000 r-xp 00000000 08:06 198090
/usr/lib/libgdk-x11-2.0.so.0.1800.3
002e7000-002e9000 r--p 00092000 08:06 198090
/usr/lib/libgdk-x11-2.0.so.0.1800.3
002e9000-002ea000 rw-p 00094000 08:06 198090
/usr/lib/libgdk-x11-2.0.so.0.1800.3
002ea000-00305000 r-xp 00000000 08:06 198967
/usr/lib/libatk-1.0.so.0.2809.1
00305000-00306000 r--p 0001b000 08:06 198967
/usr/lib/libatk-1.0.so.0.2809.1
00306000-00307000 rw-p 0001c000 08:06 198967
/usr/lib/libatk-1.0.so.0.2809.1
00307000-00308000 rwxp 00000000 00:00 0
00308000-00344000 r-xp 00000000 08:06 196888
/usr/lib/libgobject-2.0.so.0.2200.3
00344000-00345000 r--p 0003b000 08:06 196888
/usr/lib/libgobject-2.0.so.0.2200.3
00345000-00346000 rw-p 0003c000 08:06 196888
/usr/lib/libgobject-2.0.so.0.2200.3
00346000-00351000 r-xp 00000000 08:06 199652
/usr/lib/libpangocairo-1.0.so.0.2600.0
00351000-00352000 r--p 0000a000 08:06 199652
/usr/lib/libpangocairo-1.0.so.0.2600.0
00352000-00353000 rw-p 0000b000 08:06 199652
/usr/lib/libpangocairo-1.0.so.0.2600.0
00353000-003e6000 r-xp 00000000 08:06 197035
/usr/lib/libgio-2.0.so.0.2200.3
003e6000-003e7000 r--p 00092000 08:06 197035
/usr/lib/libgio-2.0.so.0.2200.3
003e7000-003e8000 rw-p 00093000 08:06 197035
/usr/lib/libgio-2.0.so.0.2200.3
003e8000-003e9000 rw-p 00000000 00:00 0
003e9000-003eb000 r-xp 00000000 08:06 198888
/usr/lib/libXcomposite.so.1.0.0
003eb000-003ec000 r--p 00001000 08:06 198888
/usr/lib/libXcomposite.so.1.0.0
003ec000-003ed000 rw-p 00002000 08:06 198888
/usr/lib/libXcomposite.so.1.0.0
003ed000-003ef000 r-xp 00000000 08:06 198892
/usr/lib/libXdamage.so.1.1.0
003ef000-003f0000 rw-p 00001000 08:06 198892
/usr/lib/libXdamage.so.1.1.0
003f0000-003f4000 r-xp 00000000 08:06 198898     /usr/lib/libXfixes.so.3.1.0
003f4000-003f5000 r--p 00003000 08:06 198898     /usr/lib/libXfixes.so.3.1.0
003f5000-003f6000 rw-p 00004000 08:06 198898     /usr/lib/libXfixes.so.3.1.0
003f6000-00404000 r-xp 00000000 08:06 198896     /usr/lib/libXext.so.6.4.0
00404000-00405000 r--p 0000d000 08:06 198896     /usr/lib/libXext.so.6.4.0
00405000-00406000 rw-p 0000e000 08:06 198896     /usr/lib/libXext.so.6.4.0
00406000-0040e000 r-xp 00000000 08:06 198918
/usr/lib/libXrender.so.1.3.0
0040e000-0040f000 r--p 00007000 08:06 198918
/usr/lib/libXrender.so.1.3.0
0040f000-00410000 rw-p 00008000 08:06 198918
/usr/lib/libXrender.so.1.3.0
00410000-00425000 r-xp 00000000 08:06 688141     /lib/tls/i686/cmov/
libpthread-2.10.1.so
00425000-00426000 r--p 00014000 08:06 688141     /lib/tls/i686/cmov/
libpthread-2.10.1.so
00426000-00427000 rw-p 00015000 08:06 688141     /lib/tls/i686/cmov/
libpthread-2.10.1.so
00427000-00429000 rw-p 00000000 00:00 0
00429000-0042b000 r-xp 00000000 08:06 198906
/usr/lib/libXinerama.so.1.0.0
0042b000-0042c000 rw-p 00001000 08:06 198906
/usr/lib/libXinerama.so.1.0.0
0042c000-00435000 r-xp 00000000 08:06 198904     /usr/lib/libXi.so.6.0.0
00435000-00436000 r--p 00008000 08:06 198904     /usr/lib/libXi.so.6.0.0
00436000-00437000 rw-p 00009000 08:06 198904     /usr/lib/libXi.so.6.0.0
00437000-00440000 r-xp 00000000 08:06 198890
/usr/lib/libXcursor.so.1.0.2
00440000-00441000 r--p 00008000 08:06 198890
/usr/lib/libXcursor.so.1.0.2
00441000-00442000 rw-p 00009000 08:06 198890
/usr/lib/libXcursor.so.1.0.2
00442000-00452000 r-xp 00000000 08:06 688142     /lib/tls/i686/cmov/
libresolv-2.10.1.so
00452000-00453000 r--p 00010000 08:06 688142     /lib/tls/i686/cmov/
libresolv-2.10.1.so
00453000-00454000 rw-p 00011000 08:06 688142     /lib/tls/i686/cmov/
libresolv-2.10.1.so
00454000-00456000 rw-p 00000000 00:00 0
00456000-0045e000 r-xp 00000000 08:06 199193
/usr/lib/libfusion-1.2.so.0.7.0
0045e000-0045f000 r--p 00007000 08:06 199193
/usr/lib/libfusion-1.2.so.0.7.0
0045f000-00460000 rw-p 00008000 08:06 199193
/usr/lib/libfusion-1.2.so.0.7.0
00460000-00463000 r-xp 00000000 08:06 199911
/usr/lib/libxcb-render-util.so.0.0.0
00463000-00464000 r--p 00002000 08:06 199911
/usr/lib/libxcb-render-util.so.0.0.0
00464000-00465000 rw-p 00003000 08:06 199911
/usr/lib/libxcb-render-util.so.0.0.0
00465000-0046c000 r-xp 00000000 08:06 199913
/usr/lib/libxcb-render.so.0.0.0
0046c000-0046d000 r--p 00007000 08:06 199913
/usr/lib/libxcb-render.so.0.0.0
0046d000-0046e000 rw-p 00008000 08:06 199913
/usr/lib/libxcb-render.so.0.0.0
0046e000-00486000 r-xp 00000000 08:06 198092
/usr/lib/libgdk_pixbuf-2.0.so.0.1800.3
00486000-00487000 r--p 00017000 08:06 198092
/usr/lib/libgdk_pixbuf-2.0.so.0.1800.3
00487000-00488000 rw-p 00018000 08:06 198092
/usr/lib/libgdk_pixbuf-2.0.so.0.1800.3
00488000-004ff000 r-xp 00000000 08:06 196251
/usr/lib/libcairo.so.2.10800.8
004ff000-00501000 r--p 00076000 08:06 196251
/usr/lib/libcairo.so.2.10800.8
00501000-00502000 rw-p 00078000 08:06 196251
/usr/lib/libcairo.so.2.10800.8
00502000-00548000 r-xp 00000000 08:06 199650
/usr/lib/libpango-1.0.so.0.2600.0
00548000-00549000 r--p 00045000 08:06 199650
/usr/lib/libpango-1.0.so.0.2600.0
00549000-0054a000 rw-p 00046000 08:06 199650
/usr/lib/libpango-1.0.so.0.2600.0
0054a000-0054e000 r-xp 00000000 08:06 198894     /usr/lib/libXdmcp.so.6.0.0
0054e000-0054f000 rw-p 00003000 08:06 198894     /usr/lib/libXdmcp.so.6.0.0
0054f000-00550000 r-xp 00000000 08:06 230770
/usr/lib/gtk-2.0/2.10.0/loaders/svg_loader.so
00550000-00551000 r--p 00001000 08:06 230770
/usr/lib/gtk-2.0/2.10.0/loaders/svg_loader.so
00551000-00552000 rw-p 00002000 08:06 230770
/usr/lib/gtk-2.0/2.10.0/loaders/svg_loader.so
00552000-00566000 r-xp 00000000 08:06 670607     /lib/libz.so.1.2.3.3
00566000-00567000 r--p 00013000 08:06 670607     /lib/libz.so.1.2.3.3
00567000-00568000 rw-p 00014000 08:06 670607     /lib/libz.so.1.2.3.3
00568000-00581000 r-xp 00000000 08:06 670575     /lib/libselinux.so.1
00581000-00582000 r--p 00018000 08:06 670575     /lib/libselinux.so.1
00582000-00583000 rw-p 00019000 08:06 670575     /lib/libselinux.so.1
00583000-005c7000 r-xp 00000000 08:06 199680
/usr/lib/libpixman-1.so.0.14.0
005c7000-005c9000 r--p 00043000 08:06 199680
/usr/lib/libpixman-1.so.0.14.0
005c9000-005ca000 rw-p 00045000 08:06 199680
/usr/lib/libpixman-1.so.0.14.0
005ca000-005e0000 r-xp 00000000 08:06 199106
/usr/lib/libdirect-1.2.so.0.7.0

Thank you,
-Alex Goretoy
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From stefan_ml at behnel.de  Mon Mar 22 03:42:07 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Mon, 22 Mar 2010 08:42:07 +0100
Subject: GC is very expensive: am I doing something wrong?
In-Reply-To: <ho6ai4$b12$2@lust.ihug.co.nz>
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>	<mailman.963.1268958842.23598.python-list@python.org>
	<ho6ai4$b12$2@lust.ihug.co.nz>
Message-ID: <ho770f$tgd$1@dough.gmane.org>

Lawrence D'Oliveiro, 22.03.2010 00:36:
> Terry Reedy wrote:
>> No one has discovered a setting
>> of the internal tuning parameters for which there are no bad patterns
>> and I suspect there are not any such. This does not negate Xavier's
>> suggestion that a code change might also solve your problem.
>
> Could it be that for implementing a structure like a trie as the OP is,
> where a lot of CPU cycles can be spent manipulating the structure, a high-
> level language like Python, Perl or Ruby just gets in the way?

I would rather say that the specific problem of the trie data structure is 
that it has extremely little benefit over other available data structures. 
There may still be a couple of niches where it makes sense to consider it 
as an alternative, but given that dicts are so heavily optimised in Python, 
it'll be hard for tries to compete even when written in a low-level language.

Remember that the original use case was to load a dictionary from a text 
file. For this use case, a trie can be very wasteful in terms of memory and 
rather CPU cache unfriendly on traversal, whereas hash values are a) rather 
fast to calculate for a string, and b) often just calculated once and then 
kept alive in the string object for later reuse.


> My feeling would be, try to get the language to do as much of the work for
> you as possible. If you can?t do that, then you might be better off with a
> lower-level language.

I agree with the first sentence, but I'd like to underline the word 'might' 
in the second. As this newsgroup shows, very often it's enough to look for 
a better algorithmic approach first.

Stefan



From agoretoy at gmail.com  Mon Mar 22 04:01:15 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Mon, 22 Mar 2010 02:01:15 -0600
Subject: execute bash builtins in python
In-Reply-To: <c9d33c541003220032j610a5339l7a502abd5389c141@mail.gmail.com>
References: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com> 
	<mailman.660.1268399795.23598.python-list@python.org>
	<pan.2010.03.17.15.44.34.750000@nowhere.com> 
	<7f014ea61003171114j60aa2a2co19e138e46ea4ee4d@mail.gmail.com> 
	<c9d33c541003211904s78ab5f70kac5625cbc766f6d7@mail.gmail.com> 
	<c9d33c541003220032j610a5339l7a502abd5389c141@mail.gmail.com>
Message-ID: <c9d33c541003220101o3164544n1e4edab641f99fec@mail.gmail.com>

for the broken pipe error, perhaps theres a different way I can get shell
output other than using subprocess? I need the output of alias command into
a string and output of declare command into a string as well, I would like
to also avoid creating of a single liner script to make this happen if at
all possible

Thank you,
-Alex Goretoy
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From steven at REMOVE.THIS.cybersource.com.au  Mon Mar 22 04:07:49 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 22 Mar 2010 08:07:49 GMT
Subject: StringChain -- a data structure for managing large sequences of 
	chunks of bytes
References: <mailman.646.1268377905.23598.python-list@python.org>
	<4b9a00ce$0$27822$c3e8da3@news.astraweb.com>
	<mailman.1055.1269234593.23598.python-list@python.org>
Message-ID: <pan.2010.03.22.08.07.48@REMOVE.THIS.cybersource.com.au>

On Sun, 21 Mar 2010 23:09:46 -0600, Zooko O'Whielacronx wrote:

> But the use case that I am talking about is where you need to accumulate
> new incoming strings into your buffer while alternately processing
> leading prefixes of the buffer.
[...]
> Below are the abbreviated results of the benchmark. You can easily run
> this benchmark yourself by following the README.txt in the StringChain
> source package [3]. These results show that for the load imposed by this
> benchmark StringChain is the only one of the four that scales and that
> it is also nice and fast.

I was reading this email, and thinking "Why do you need this StringChain 
data structure, from the description it sounds like a job for 
collections.deque?"

And funnily enough, following the links you supplied I came across this:

"You can get the package from  http://pypi.python.org/pypi/stringchain or 
with darcs get http://tahoe-lafs.org/source/stringchain/trunk. It has 
unit tests. It is in pure Python (it uses collections.deque and string)."

http://tahoe-lafs.org/trac/stringchain


Perhaps you should have said that it was a wrapper around deque giving 
richer functionality, rather than giving the impression that it was a 
brand new data structure invented by you. People are naturally going to 
be more skeptical about a newly invented data structure than one based on 
a reliable, component like deque.

In any case, it looks to me that the StringChain data structure itself is 
a little too application specific for me to be personally interested in 
it. Maybe you should consider linking to it on PyPI and seeing if there 
is any interest from others?



Regards,





Steven


From agoretoy at gmail.com  Mon Mar 22 06:15:29 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Mon, 22 Mar 2010 04:15:29 -0600
Subject: execute bash builtins in python
In-Reply-To: <c9d33c541003220101o3164544n1e4edab641f99fec@mail.gmail.com>
References: <c9d33c541003112252w57ebe9ep140a1ec9e10dd424@mail.gmail.com> 
	<mailman.660.1268399795.23598.python-list@python.org>
	<pan.2010.03.17.15.44.34.750000@nowhere.com> 
	<7f014ea61003171114j60aa2a2co19e138e46ea4ee4d@mail.gmail.com> 
	<c9d33c541003211904s78ab5f70kac5625cbc766f6d7@mail.gmail.com> 
	<c9d33c541003220032j610a5339l7a502abd5389c141@mail.gmail.com> 
	<c9d33c541003220101o3164544n1e4edab641f99fec@mail.gmail.com>
Message-ID: <c9d33c541003220315v217c464btb796ebd8baa442a4@mail.gmail.com>

actually using the -i param in the command to subprocess doesn't seem to
work as well as setting PS1 to some garbage, it starts a new interactive
shell therein kicking me out of python. :/

Thank you,
-Alex Goretoy
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From jeanmichel at sequans.com  Mon Mar 22 06:35:21 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 22 Mar 2010 11:35:21 +0100
Subject: Tuples vs. variable-length argument lists
In-Reply-To: <843bf1a3-6e9b-48d2-8661-b3f776a6fde2@t32g2000prg.googlegroups.com>
References: <843bf1a3-6e9b-48d2-8661-b3f776a6fde2@t32g2000prg.googlegroups.com>
Message-ID: <4BA747E9.5020009@sequans.com>

Spencer Pearson wrote:
> Hi!
>
> This might be more of a personal-preference question than anything,
> but here goes: when is it appropriate for a function to take a list or
> tuple as input, and when should it allow a varying number of
> arguments? It seems as though the two are always interchangeable. For
> a simple example...
>
> def subtract( x, nums ):
>   return x - sum( nums )
>
> ... works equally well if you define it as "subtract( x, *nums )" and
> put an asterisk in front of any lists/tuples you pass it. I can't
> think of any situation where you couldn't convert from one form to the
> other with just a star or a pair of parentheses.
>
> Is there a generally accepted convention for which method to use? Is
> there ever actually a big difference between the two that I'm not
> seeing?
>   
FYI some linters report the usage of * as bad practice, I don't know the 
reason though. Pylint reports it as using 'magic'.
Anyway the form without * is commonly used.

JM


From ldo at geek-central.gen.new_zealand  Mon Mar 22 07:00:30 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Tue, 23 Mar 2010 00:00:30 +1300
Subject: What is pkg-config for ?
References: <ad871976-202d-4495-8294-2047573b565b@c16g2000yqd.googlegroups.com>
	<mailman.987.1269033144.23598.python-list@python.org>
Message-ID: <ho7ike$2lv$1@lust.ihug.co.nz>

In message <mailman.987.1269033144.23598.python-list at python.org>, Gabriel 
Genellina wrote:

> I fail to see how is this relevant to Python...

Well, so many of the questions in this noisegroup seem to be about Windows 
problems, not Python ones... :)


From jeanmichel at sequans.com  Mon Mar 22 07:01:00 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 22 Mar 2010 12:01:00 +0100
Subject: accessing variable of the __main__ module
In-Reply-To: <4ba4bc88$0$29961$426a74cc@news.free.fr>
References: <4ba4bc88$0$29961$426a74cc@news.free.fr>
Message-ID: <4BA74DEC.90006@sequans.com>

News123 wrote:
> Hi,
>
>
> I wondered about the best way, that a  module's function could determine
> the existance and value of variables in the __main__ module.
>
>
> What I came up with is:
> ########### main.py ##########
> import mod
> A = 4
> if __name__ == "__main__": mod.f()
> ########### mod.py ##########
> def f():
>     try:
>         from __main__ import A
>     except ImportError as e:
>         A = "does not exist"
>     print "__main__.A" ,A
>
> Is there anything better / more pythonic?
>
> Thanks in advance and bye
>
>
> N
>   
The 'was I imported from that module' is usually some sign of bad 
design. I can't detail more wihtout further detail of what you're trying 
to achieve. Bud since what you have is working, I would'nt bother more 
than that cause no matter what you try, it will be ugly :o).

JM


From newton10471 at gmail.com  Mon Mar 22 09:26:45 2010
From: newton10471 at gmail.com (newton10471)
Date: Mon, 22 Mar 2010 06:26:45 -0700 (PDT)
Subject: chroot fails with mount point passed to subprocess.Popen?
Message-ID: <6a601e7c-7a89-4747-a25c-a78743fe47ab@g4g2000yqa.googlegroups.com>

Hi,

I'm trying to use subprocess.Popen() to do a Linux chroot to a mount
point passed in as a parameter to the following function:

def getInstalledKernelVersion(mountPoint):
    linuxFsRoot = mountPoint + "/root"
    print "type of linuxFsRoot is %s" % type(linuxFsRoot)
    installedKernelVersionResult =
subprocess.Popen(['chroot',linuxFsRoot,'rpm','-q','kernel-xen'])
    return installedKernelVersionResult

and it dies with the following:

type of linuxFsRoot is <type 'str'>
chroot: cannot change root directory to /storage/mounts/
mnt_3786314034939740895.mnt/root: No such file or directory

When I explicitly set linuxFsRoot = "/storage/mounts/
mnt_3786314034939740895.mnt/root", it works fine.

I also tried this to concatenate the mountpoint + /root, and it failed
in the same way:

linuxFsRoot = ("%s/root") % mountPoint

Anyone know what might be happening here?

Thanks in advance,

Matt Newton


From alfps at start.no  Mon Mar 22 09:33:31 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Mon, 22 Mar 2010 14:33:31 +0100
Subject: chroot fails with mount point passed to subprocess.Popen?
In-Reply-To: <6a601e7c-7a89-4747-a25c-a78743fe47ab@g4g2000yqa.googlegroups.com>
References: <6a601e7c-7a89-4747-a25c-a78743fe47ab@g4g2000yqa.googlegroups.com>
Message-ID: <ho7rjf$lki$1@news.eternal-september.org>

* newton10471:
> Hi,
> 
> I'm trying to use subprocess.Popen() to do a Linux chroot to a mount
> point passed in as a parameter to the following function:
> 
> def getInstalledKernelVersion(mountPoint):
>     linuxFsRoot = mountPoint + "/root"
>     print "type of linuxFsRoot is %s" % type(linuxFsRoot)
>     installedKernelVersionResult =
> subprocess.Popen(['chroot',linuxFsRoot,'rpm','-q','kernel-xen'])
>     return installedKernelVersionResult
> 
> and it dies with the following:
> 
> type of linuxFsRoot is <type 'str'>
> chroot: cannot change root directory to /storage/mounts/
> mnt_3786314034939740895.mnt/root: No such file or directory
> 
> When I explicitly set linuxFsRoot = "/storage/mounts/
> mnt_3786314034939740895.mnt/root", it works fine.
> 
> I also tried this to concatenate the mountpoint + /root, and it failed
> in the same way:
> 
> linuxFsRoot = ("%s/root") % mountPoint

Use the os.path functions.


> Anyone know what might be happening here?

Since the computed and literal paths /look/ identical and same type, the only 
thing I can imagine is that there is some invisible character. Try comparing the 
computed and literal path character by character. Print the difference or if 
they're identical, that they are.

Possibly you have GIGO problem.


Cheers & hth.,

- Alf


From no.email at please.post  Mon Mar 22 09:54:27 2010
From: no.email at please.post (kj)
Date: Mon, 22 Mar 2010 13:54:27 +0000 (UTC)
Subject: How to automate accessor definition?
References: <ho3heq$61v$1@reader1.panix.com>
	<639908184290880449.447600deets-nospam.web.de@news.hansenet.de>
	<ho5j64$22l$1@reader1.panix.com>
	<mailman.1030.1269194878.23598.python-list@python.org>
Message-ID: <ho7sqi$jq$1@reader1.panix.com>

In <mailman.1030.1269194878.23598.python-list at python.org> Dennis Lee Bieber <wlfraed at ix.netcom.com> writes:

>On Sun, 21 Mar 2010 16:57:40 +0000 (UTC), kj <no.email at please.post>
>declaimed the following in gmane.comp.python.general:

>> Regarding properties, is there a built-in way to memoize them? For
>> example, suppose that the value of a property is obtained by parsing
>> the contents of a file (specified in another instance attribute).
>> It would make no sense to do this parsing more than once.  Is there
>> a standard idiom for memoizing the value once it is determined for
>> the first time?
>>
>	Pickle, Shelve? Maybe in conjunction with SQLite3...

I was thinking of something less persistent; in-memory, that is.
Maybe something in the spirit of:

@property
def foo(self):
    # up for some "adaptive auto-redefinition"?
    self.foo = self._some_time_consuming_operation()
    return self.foo

...except that that assignment won't work! It bombs with "AttributeError:
can't set attribute".

~K

PS: BTW, this is not the first time that attempting to set an
attribute (in a class written by me even) blows up on me.  It's
situations like these that rattle my grasp of attributes, hence my
original question about boring, plodding, verbose Java-oid accessors.
For me these Python attributes are still waaay too mysterious and
unpredictable to rely on.  Sometimes one can set them, sometimes
not, and I can't quite tell the two situations apart.  It's all
very confusing to the Noob.  (I'm sure this is all documented
*somewhere*, but this does not make using attributes any more
intuitive or straightforward.  I'm also sure that *eventually*,
with enough Python experience under one's belt, this all becomes
second nature.  My point is that Python attributes are not as
transparent and natural to the uninitiated as some of you folks
seem to think.)


From alfps at start.no  Mon Mar 22 10:22:02 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Mon, 22 Mar 2010 15:22:02 +0100
Subject: How to automate accessor definition?
In-Reply-To: <ho7sqi$jq$1@reader1.panix.com>
References: <ho3heq$61v$1@reader1.panix.com>
	<639908184290880449.447600deets-nospam.web.de@news.hansenet.de>
	<ho5j64$22l$1@reader1.panix.com>
	<mailman.1030.1269194878.23598.python-list@python.org>
	<ho7sqi$jq$1@reader1.panix.com>
Message-ID: <ho7ueg$bi6$1@news.eternal-september.org>

* kj:
> In <mailman.1030.1269194878.23598.python-list at python.org> Dennis Lee Bieber <wlfraed at ix.netcom.com> writes:
> 
>> On Sun, 21 Mar 2010 16:57:40 +0000 (UTC), kj <no.email at please.post>
>> declaimed the following in gmane.comp.python.general:
> 
>>> Regarding properties, is there a built-in way to memoize them? For
>>> example, suppose that the value of a property is obtained by parsing
>>> the contents of a file (specified in another instance attribute).
>>> It would make no sense to do this parsing more than once.  Is there
>>> a standard idiom for memoizing the value once it is determined for
>>> the first time?
>>>
>> 	Pickle, Shelve? Maybe in conjunction with SQLite3...
> 
> I was thinking of something less persistent; in-memory, that is.
> Maybe something in the spirit of:
> 
> @property
> def foo(self):
>     # up for some "adaptive auto-redefinition"?
>     self.foo = self._some_time_consuming_operation()
>     return self.foo
> 
> ...except that that assignment won't work! It bombs with "AttributeError:
> can't set attribute".

Since foo is a read only property you can assign to it.

But it doesn't matter: if it worked technically it wouldn't give you what you're 
after, the once-only evaluation.

A simple way to do that, in the sense of copying code and having it work, is to 
use a generator that, after evaluating the expensive op, loops forever yielding 
the resulting value.

A probably more efficient way, and anyway one perhaps more easy to understand, 
is as follows:


<code>
from __future__ import print_function

class LazyEval:
     def __init__( self, f ):
         self._f = f
         self._computed = False

     @property
     def value( self ):
         if not self._computed:
             self._value = self._f()
             self._computed = True
         return self._value

class HiHo:
     def _expensive_op( self ):
         print( "Expensive op!" )
         return 42

     def __init__( self ):
         self._foo = LazyEval( self._expensive_op )

     @property
     def foo( self ):
         return self._foo.value

o = HiHo()
for i in range( 5 ):
     print( o.foo )
</code>


Cheers & hth.,

- Alf


From albert at spenarnc.xs4all.nl  Mon Mar 22 10:26:10 2010
From: albert at spenarnc.xs4all.nl (Albert van der Horst)
Date: 22 Mar 2010 14:26:10 GMT
Subject: subtraction is giving me a syntax error
References: <56597268-3472-4fd9-a829-6d9cf51cf093@e7g2000yqf.googlegroups.com>
Message-ID: <kzotfm.8ve@spenarnc.xs4all.nl>

In article <56597268-3472-4fd9-a829-6d9cf51cf093 at e7g2000yqf.googlegroups.com>,
Joel Pendery  <joel.pendery at gmail.com> wrote:
>So I am trying to write a bit of code and a simple numerical
>subtraction
>
>y_diff = y_diff-H
>
>is giving me the error
>
>Syntaxerror: Non-ASCII character '\x96' in file on line 70, but no
>encoding declared.
>
>Even though I have deleted some lines before it and this line is no
>longer line 70, I am still getting the error every time.  I have tried
>to change the encoding of the file to utf-8 but to no avail, I still
>am having this issue.  Any ideas?

Make a hex-dump of your file. How does line 70 look?
If you see
0900 66 66 96 48 0A  --              ff.H.

you know you are doing something illegal.

>
>Thanks in advance

Groetjes Albert

P.S. With all due respect, error messages come not any clearer than
that!

--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- being exponential -- ultimately falters.
albert at spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst



From no.email at please.post  Mon Mar 22 10:45:22 2010
From: no.email at please.post (kj)
Date: Mon, 22 Mar 2010 14:45:22 +0000 (UTC)
Subject: short-circuiting any/all ?
Message-ID: <ho7vq2$1s5$1@reader1.panix.com>




I have a list of items L, and a test function is_invalid that checks
the validity of each item.  To check that there are no invalid
items in L, I could check the value of any(map(is_invalid, L)).
But this approach is suboptimal in the sense that, no matter what
L is, is_invalid will be executed for all elements of L, even though
the value returned by any() is fully determined by the first True
in its argument.  In other words, all calls to is_invalid after
the first one to return True are superfluous.  Is there a
short-circuiting counterpart to any(map(is_invalid, L)) that avoids
these superfluous calls?

OK, there's this one, of course:

def _any_invalid(L):
    for i in L:
        if is_invalid(i):
            return True
    return False   

But is there anything built-in?  (I imagine that a lazy version of
map *may* do the trick, *if* any() will let it be lazy.)

TIA!

~K


From john at castleamber.com  Mon Mar 22 10:47:09 2010
From: john at castleamber.com (John Bokma)
Date: Mon, 22 Mar 2010 08:47:09 -0600
Subject: add an entry to twentyquestions.org  (please)
References: <73490ec3-5d3f-417a-b0fc-c697cd0fb08a@30g2000yqi.googlegroups.com>
	<8739ztt9gg.fsf@benfinney.id.au>
Message-ID: <87bpeg8lci.fsf@castleamber.com>

Ben Finney <ben+python at benfinney.id.au> writes:

> twenty questions <twentyqstns at gmail.com> writes:
>
>> add an entry to http://
>
> Don't spam groups with your off-topic begging for a closed database silo
> (please)

Don't repeat spam

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From mail at timgolden.me.uk  Mon Mar 22 10:57:38 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Mon, 22 Mar 2010 14:57:38 +0000
Subject: short-circuiting any/all ?
In-Reply-To: <ho7vq2$1s5$1@reader1.panix.com>
References: <ho7vq2$1s5$1@reader1.panix.com>
Message-ID: <4BA78562.3070802@timgolden.me.uk>

On 22/03/2010 14:45, kj wrote:
> I have a list of items L, and a test function is_invalid that checks
> the validity of each item.  To check that there are no invalid
> items in L, I could check the value of any(map(is_invalid, L)).
> But this approach is suboptimal in the sense that, no matter what
> L is, is_invalid will be executed for all elements of L, even though
> the value returned by any() is fully determined by the first True
> in its argument.  In other words, all calls to is_invalid after
> the first one to return True are superfluous.  Is there a
> short-circuiting counterpart to any(map(is_invalid, L)) that avoids
> these superfluous calls?
>
> OK, there's this one, of course:
>
> def _any_invalid(L):
>      for i in L:
>          if is_invalid(i):
>              return True
>      return False
>
> But is there anything built-in?  (I imagine that a lazy version of
> map *may* do the trick, *if* any() will let it be lazy.)

Have I missed the point of your question, perhaps? This seems
to work as lazily as you'd like...

<code>
def less_than_five (x):
   print "testing", x
   return x < 5

L = range (10)
print any (less_than_five (i) for i in L)
print all (less_than_five (i) for i in L) # for symmetry

</code>

TJG


From jeanmichel at sequans.com  Mon Mar 22 11:08:49 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Mon, 22 Mar 2010 16:08:49 +0100
Subject: short-circuiting any/all ?
In-Reply-To: <ho7vq2$1s5$1@reader1.panix.com>
References: <ho7vq2$1s5$1@reader1.panix.com>
Message-ID: <4BA78801.3040605@sequans.com>

kj wrote:
>
> I have a list of items L, and a test function is_invalid that checks
> the validity of each item.  To check that there are no invalid
> items in L, I could check the value of any(map(is_invalid, L)).
> But this approach is suboptimal in the sense that, no matter what
> L is, is_invalid will be executed for all elements of L, even though
> the value returned by any() is fully determined by the first True
> in its argument.  In other words, all calls to is_invalid after
> the first one to return True are superfluous.  Is there a
> short-circuiting counterpart to any(map(is_invalid, L)) that avoids
> these superfluous calls?
>
> OK, there's this one, of course:
>
> def _any_invalid(L):
>     for i in L:
>         if is_invalid(i):
>             return True
>     return False   
>
> But is there anything built-in?  (I imagine that a lazy version of
> map *may* do the trick, *if* any() will let it be lazy.)
>
> TIA!
>
> ~K
>   
Sounds like unnecessary optimization. Just write

def _any_valid(L):
    return bool([i for i in L if is_valid(i)])

If you really care about speed, meaning if the user experiences some 
execution duration increase, then the solution you proposed is fine.


JM
   


From tim.wintle at teamrubber.com  Mon Mar 22 11:12:52 2010
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Mon, 22 Mar 2010 15:12:52 +0000
Subject: short-circuiting any/all ?
In-Reply-To: <ho7vq2$1s5$1@reader1.panix.com>
References: <ho7vq2$1s5$1@reader1.panix.com>
Message-ID: <1269270772.2407.1.camel@localhost>

On Mon, 2010-03-22 at 14:45 +0000, kj wrote:
> I have a list of items L, and a test function is_invalid that checks
> the validity of each item.  To check that there are no invalid
> items in L, I could check the value of any(map(is_invalid, L)).
> But this approach is suboptimal in the sense that, no matter what
> L is, is_invalid will be executed for all elements of L,

any( is_invalid(a) for a in L )

... generator expression will be lazily computed.

Tim



From pruebauno at latinmail.com  Mon Mar 22 11:17:03 2010
From: pruebauno at latinmail.com (nn)
Date: Mon, 22 Mar 2010 08:17:03 -0700 (PDT)
Subject: short-circuiting any/all ?
References: <ho7vq2$1s5$1@reader1.panix.com>
Message-ID: <291d82b7-b13b-4f49-901c-8194f3e07598@e7g2000yqf.googlegroups.com>



kj wrote:
> I have a list of items L, and a test function is_invalid that checks
> the validity of each item.  To check that there are no invalid
> items in L, I could check the value of any(map(is_invalid, L)).
> But this approach is suboptimal in the sense that, no matter what
> L is, is_invalid will be executed for all elements of L, even though
> the value returned by any() is fully determined by the first True
> in its argument.  In other words, all calls to is_invalid after
> the first one to return True are superfluous.  Is there a
> short-circuiting counterpart to any(map(is_invalid, L)) that avoids
> these superfluous calls?
>
> OK, there's this one, of course:
>
> def _any_invalid(L):
>     for i in L:
>         if is_invalid(i):
>             return True
>     return False
>
> But is there anything built-in?  (I imagine that a lazy version of
> map *may* do the trick, *if* any() will let it be lazy.)
>
> TIA!
>
> ~K

If you are in Python 3 "any(map(is_invalid, L))" should short circuit.
If you are in Python 2 use "from itertools import imap;
any(imap(is_invalid, L))"


From robert.kern at gmail.com  Mon Mar 22 11:22:29 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Mon, 22 Mar 2010 10:22:29 -0500
Subject: nonuniform sampling with replacement
In-Reply-To: <0c333952-2150-4207-90e8-7bb3f2bc7c4c@b9g2000pri.googlegroups.com>
References: <0c333952-2150-4207-90e8-7bb3f2bc7c4c@b9g2000pri.googlegroups.com>
Message-ID: <ho81vm$2ua$1@dough.gmane.org>

On 2010-03-21 05:11 AM, Jah_Alarm wrote:
> I've got a vector length n of integers (some of them are repeating),

I recommend reducing it down to unique integers first.

> and I got a selection probability vector of the same length. How will
> I sample with replacement k (<=n) values with the probabilty vector.
> In Matlab this function is randsample. I couldn't find anything to
> this extent in Scipy or Numpy.

In [19]: from scipy.stats import rv_discrete

In [20]: p = rv_discrete(name='adhoc', values=([0, 1, 2], [0.5, 0.25, 0.25]))

In [21]: p.rvs(size=100)
Out[21]:
array([0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 0, 1, 2, 2, 2, 1, 0, 0, 2, 0, 0, 1, 0,
        0, 2, 2, 0, 1, 2, 1, 0, 0, 2, 1, 1, 1, 1, 1, 2, 1, 2, 0, 2, 0, 2, 0,
        0, 2, 0, 1, 0, 2, 2, 1, 0, 0, 1, 0, 2, 1, 0, 0, 1, 0, 2, 1, 2, 1, 0,
        1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 2, 0, 1,
        2, 1, 1, 0, 0, 0, 1, 0])

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From bruno.42.desthuilliers at websiteburo.invalid  Mon Mar 22 11:44:01 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Mon, 22 Mar 2010 16:44:01 +0100
Subject: How to automate accessor definition?
In-Reply-To: <ho7sqi$jq$1@reader1.panix.com>
References: <ho3heq$61v$1@reader1.panix.com>
	<639908184290880449.447600deets-nospam.web.de@news.hansenet.de>
	<ho5j64$22l$1@reader1.panix.com>
	<mailman.1030.1269194878.23598.python-list@python.org>
	<ho7sqi$jq$1@reader1.panix.com>
Message-ID: <4ba79040$0$22397$426a74cc@news.free.fr>

kj a ?crit :
> In <mailman.1030.1269194878.23598.python-list at python.org> Dennis Lee Bieber <wlfraed at ix.netcom.com> writes:
> 
>> On Sun, 21 Mar 2010 16:57:40 +0000 (UTC), kj <no.email at please.post>
>> declaimed the following in gmane.comp.python.general:
> 
>>> Regarding properties, is there a built-in way to memoize them? For
>>> example, suppose that the value of a property is obtained by parsing
>>> the contents of a file (specified in another instance attribute).
>>> It would make no sense to do this parsing more than once.  Is there
>>> a standard idiom for memoizing the value once it is determined for
>>> the first time?
>>>
>> 	Pickle, Shelve? Maybe in conjunction with SQLite3...
> 
> I was thinking of something less persistent; in-memory, that is.
> Maybe something in the spirit of:
> 
> @property
> def foo(self):
>     # up for some "adaptive auto-redefinition"?
>     self.foo = self._some_time_consuming_operation()
>     return self.foo
> 
> ...except that that assignment won't work! It bombs with "AttributeError:
> can't set attribute".
> 
> ~K
> 
> PS: BTW, this is not the first time that attempting to set an
> attribute (in a class written by me even) blows up on me.  It's
> situations like these that rattle my grasp of attributes, hence my
> original question about boring, plodding, verbose Java-oid accessors.
> For me these Python attributes are still waaay too mysterious and
> unpredictable to rely on.

Somehow simplified, here's what you have to know:

1/ there are instance attributes and class attributes. Instance 
attributes lives in the instance's __dict__, class attributes lives in 
the class's __dict__ or in a parent's class __dict__.

2/ when looking up an attribute on an instance, the rules are
* first, check if there's a key by that name in the instance's __dict__. 
If yes, return the associated value
* else, check if there's a class or parent class attribute by that name.
* if yes
** if the attribute has a '__get__' method, call the __get__ method with 
class and instance as arguments, and return the result (this is known as 
the "descriptor protocol" and provides support for computed attributes 
(including methods and properties)
** else return the attribute itself
* else (if nothing has been found yet), look for a __getattr__ method in 
the class and it's parents. If found, call this __getattr__ method with 
the attribute name and return the result
* else, give up and raise an AttributeError

3/ When binding an attribute on an instance, the rules are:
* first, check if there's a class (or parent class) attribute by that 
name that has a '__set__' method. If yes, call this class attribute's 
__set__ method with instance and value as arguments. This is the second 
part part of the "descriptor protocol", as used by the property type.
* else, add the attribute's name and value in the instance's __dict__


As I said, this is a somehow simplified description of the process - I 
skipped the parts about __slots__, __getattribute__ and __setattr__, as 
well as the part about how function class attributes become methods. But 
this should be enough to get an idea of what's going on.

In your above case, you defined a "foo" property class attribute. The 
property type implements both __get__ and __set__, but you only defined 
a callback for the __get__ method (the function you decorated with 
'property'), so when you try to rebind "foo", the default property 
type's __set__ implementation is invoked, which behaviour is to forbid 
setting the attribute. If you want a settable property, you have to 
provide a setter too.

Now if you want a "replaceable" property-like attribute, you could 
define your own computed attribute (aka "descriptor") type _without_ a 
__set__ method:

class replaceableprop(object):
     def __init__(self, fget):
         self._fget = fget
     def __get__(self, instance, cls):
         if instance is None:
             return self
         return self._fget(instance)

@replaceableprop
def foo(self):
     # will add 'foo' into self.__dict__, s
     self.foo = self._some_time_consuming_operation()
     return self.foo


Another (better IMHO) solution is to use a plain property, and store the 
computed value as an implementation attribute :

@property
def foo(self):
   cached = self.__dict__.get('_foo_cache')
   if cached is None:
       self._foo_cache = cached = self._some_time_consuming_operation()
   return cached


>  Sometimes one can set them, sometimes
> not, and I can't quite tell the two situations apart.  It's all
> very confusing to the Noob.  (I'm sure this is all documented
> *somewhere*, but this does not make using attributes any more
> intuitive or straightforward.  I'm also sure that *eventually*,
> with enough Python experience under one's belt, this all becomes
> second nature.  My point is that Python attributes are not as
> transparent and natural to the uninitiated as some of you folks
> seem to think.)

I agree that the introduction of the descriptor protocol added some more 
complexity to an already somehow unusual model object.

HTH.


From jjposner at optimum.net  Mon Mar 22 13:36:34 2010
From: jjposner at optimum.net (John Posner)
Date: Mon, 22 Mar 2010 13:36:34 -0400
Subject: How to automate accessor definition?
In-Reply-To: <4ba79040$0$22397$426a74cc@news.free.fr>
References: <ho3heq$61v$1@reader1.panix.com>
	<639908184290880449.447600deets-nospam.web.de@news.hansenet.de>
	<ho5j64$22l$1@reader1.panix.com>
	<mailman.1030.1269194878.23598.python-list@python.org>
	<ho7sqi$jq$1@reader1.panix.com>
	<4ba79040$0$22397$426a74cc@news.free.fr>
Message-ID: <4ba7aa87$0$4974$607ed4bc@cv.net>

On 3/22/2010 11:44 AM, Bruno Desthuilliers wrote:

<snip>

> Another (better IMHO) solution is to use a plain property, and store the
> computed value as an implementation attribute :
>
> @property
> def foo(self):
> cached = self.__dict__.get('_foo_cache')
> if cached is None:
> self._foo_cache = cached = self._some_time_consuming_operation()
> return cached
>

There's no need to access __dict__ directly. I believe this is 
equivalent (and clearer):

  @property
  def foo(self):
      try:
          cached = self._foo_cache
      except AttributeError:
          self._foo_cache = cached = self._time_consuming_op()
      return cached

-John


From luismgz at gmail.com  Mon Mar 22 13:59:07 2010
From: luismgz at gmail.com (=?ISO-8859-1?Q?Luis_M=2E_Gonz=E1lez?=)
Date: Mon, 22 Mar 2010 10:59:07 -0700 (PDT)
Subject: DreamPie - The Python shell you've always dreamed about!
References: <6c6a96e0-be08-4ec3-a002-0bb9232a8afd@f29g2000yqa.googlegroups.com>
	<12cd38b0-1d34-4b1e-96fb-19c3e2f62ab7@e1g2000yqh.googlegroups.com> 
	<0fe91504-cb4f-46b6-a327-c5979bb104a6@q16g2000yqq.googlegroups.com> 
	<7430987e-3603-4805-b4f4-cae73ca2d3f6@g11g2000yqe.googlegroups.com> 
	<b10235a4-586d-4c81-96f4-acaed4d61797@b2g2000yqi.googlegroups.com>
Message-ID: <15025fc0-c697-4085-81a0-160882767540@15g2000yqi.googlegroups.com>

On Feb 21, 6:40?pm, Mensanator <mensana... at aol.com> wrote:
> On Feb 21, 12:14?pm, Paul Boddie <p... at boddie.org.uk> wrote:
>
>
>
>
>
> > On 21 Feb, 17:32, Mensanator <mensana... at aol.com> wrote:
>
> > > On Feb 21, 10:30 am, Mensanator <mensana... at aol.com> wrote:
>
> > > > What versions of Python does it suuport?
>
> > > What OS are supported?
>
> > From the Web site referenced in the announcement (http://
> > dreampie.sourceforge.net/):
>
> > """
> > # Supports Python 2.5, Python 2.6, Jython 2.5, IronPython 2.6 and
> > Python 3.1.
> > # Works on Windows and Linux.
> > """
>
> Yeah, I saw that. Funny that something important like that wasn't part
> of the
> announcement. I notice no mention of Mac OS, so visiting the website
> was a complete
> waste of time on my part, wasn't it?
>
>
>
> > Paul

Geez... someone spends many hours (or days or even months) writing a
program to be offered for free to the world, and you get annoyed by
losing two seconds while checking it out?


From chambon.pascal at wanadoo.fr  Mon Mar 22 14:20:39 2010
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Mon, 22 Mar 2010 19:20:39 +0100
Subject: Castrated traceback in sys.exc_info()
In-Reply-To: <op.u9uflwxxx6zn5v@lepton.softlabbsas.com.ar>
References: <7866674b-46ba-49e2-9d76-e8259ba22df0@z3g2000yqz.googlegroups.com>	<20100317124019.7013dfa3@moriz.interne>	<9fd96c3b1003170542t4ea864c6y359107cb747536da@mail.gmail.com>
	<op.u9uflwxxx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <4BA7B4F7.6080404@wanadoo.fr>

Gabriel Genellina a ?crit :
>
> En Wed, 17 Mar 2010 09:42:06 -0300, Pascal Chambon 
> <chambon.pascal at gmail.com> escribi?:
>
>> traceback functions indeed allow the manipulation of exception 
>> tracebacks,
>> but the root problem is that anyway, since that traceback is incomplete,
>> your "traceback.format_exc().splitlines()" will only provide frames for
>> callee (downward) functions, not caller (upward) ones, starting from the
>> exception catching frame.
>
> Either I don't understand what you mean, or I can't reproduce it:
>
>

Allright, here is more concretely the problem :

<code>
import logging

def a(): return b()
def b(): return c()
def c():
    try:
        return d()
    except:
        logging.exception("An error")
   
def d(): raise ValueError

def main():
    logging.basicConfig(level=logging.DEBUG)
    a()
 
main()
</code>

OUTPUT:
 >>>
ERROR:root:An error
Traceback (most recent call last):
  File "C:/Users/Pakal/Desktop/aaa.py", line 7, in c
    return d()
  File "C:/Users/Pakal/Desktop/aaa.py", line 11, in d
    def d(): raise ValueError
ValueError
 >>>


As you see, the traceback only starts from function c, which handles the 
exception.
It doesn't show main(), a() and b(), which might however be (and are, in 
my case) critical to diagnose the severity of the problem (since many 
different paths would lead to calling c()).

So the question is : is that possible to enforce, by a way or another, 
the retrieval of the FULL traceback at exception raising point, instead 
of that incomplete one ?

Thank you for your help,
regards,

Pascal




From python at rcn.com  Mon Mar 22 14:27:57 2010
From: python at rcn.com (Raymond Hettinger)
Date: Mon, 22 Mar 2010 11:27:57 -0700 (PDT)
Subject: short-circuiting any/all ?
References: <ho7vq2$1s5$1@reader1.panix.com>
Message-ID: <defa8f1f-4932-49f0-a538-377e27b3254b@p3g2000pra.googlegroups.com>

On Mar 22, 7:45?am, kj <no.em... at please.post> wrote:
> I have a list of items L, and a test function is_invalid that checks
> the validity of each item. ?To check that there are no invalid
> items in L, I could check the value of any(map(is_invalid, L)).
> But this approach is suboptimal in the sense that, no matter what
> L is, is_invalid will be executed for all elements of L, even though
> the value returned by any() is fully determined by the first True
> in its argument. ?In other words, all calls to is_invalid after
> the first one to return True are superfluous. ?Is there a
> short-circuiting counterpart to any(map(is_invalid, L)) that avoids
> these superfluous calls?
>
> OK, there's this one, of course:
>
> def _any_invalid(L):
> ? ? for i in L:
> ? ? ? ? if is_invalid(i):
> ? ? ? ? ? ? return True
> ? ? return False ?
>
> But is there anything built-in? ?(I imagine that a lazy version of
> map *may* do the trick, *if* any() will let it be lazy.)

Yes, that will work:

      from itertools import imap  # lazy version of map
      any(imap(is_invalid, L)     # short-circuits on first True

Yet another approach (slightly faster):

   from itertools import ifilter
   any(ifilter(is_invalid, L))


Raymond





From no.email at please.post  Mon Mar 22 14:30:34 2010
From: no.email at please.post (kj)
Date: Mon, 22 Mar 2010 18:30:34 +0000 (UTC)
Subject: short-circuiting any/all ?
References: <ho7vq2$1s5$1@reader1.panix.com>
	<291d82b7-b13b-4f49-901c-8194f3e07598@e7g2000yqf.googlegroups.com>
Message-ID: <ho8d0a$261$1@reader1.panix.com>

In <291d82b7-b13b-4f49-901c-8194f3e07598 at e7g2000yqf.googlegroups.com> nn <pruebauno at latinmail.com> writes:

>If you are in Python 3 "any(map(is_invalid, L))" should short circuit.
>If you are in Python 2 use "from itertools import imap;
>any(imap(is_invalid, L))"

Thanks!  I'm glad to know that one can get the short circuiting
using a map-type idiom.  (I prefer map over comprehensions when I
don't need to define a function just for the purpose of passing it
to it.)

And thanks also to the other repliers for pointing out that the
comprehension version does what I was asking for.

~K


From mail at timgolden.me.uk  Mon Mar 22 14:43:07 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Mon, 22 Mar 2010 18:43:07 +0000
Subject: short-circuiting any/all ?
In-Reply-To: <ho8d0a$261$1@reader1.panix.com>
References: <ho7vq2$1s5$1@reader1.panix.com>	<291d82b7-b13b-4f49-901c-8194f3e07598@e7g2000yqf.googlegroups.com>
	<ho8d0a$261$1@reader1.panix.com>
Message-ID: <4BA7BA3B.2000006@timgolden.me.uk>

On 22/03/2010 18:30, kj wrote:
> Thanks!  I'm glad to know that one can get the short circuiting
> using a map-type idiom.  (I prefer map over comprehensions when I
> don't need to define a function just for the purpose of passing it
> to it.)

In what way does "map" over "comprehensions" save you defining a function?

any (map (is_invalid, L))
any (is_invalid (i) for i in L)

TJG



From krister.svanlund at gmail.com  Mon Mar 22 17:19:49 2010
From: krister.svanlund at gmail.com (Krister Svanlund)
Date: Mon, 22 Mar 2010 22:19:49 +0100
Subject: Problem with sys.path when embedding Python3 in C
Message-ID: <2cf430a61003221419t2192c9aajd3c2d2922b1d7f12@mail.gmail.com>

Hi, I've recently begun experimenting with embedding python and i got
a small problem.
This is my current testing code (basically all from python docs):

> int main(int argc, char *argv[])
>
> {
>
> PyObject *pModuleName, *pTestModule, *pTestFunc, *pTestResult, *pTestArgs;
>
> PyImport_AppendInittab("node", &PyInit_node);
>
> Py_Initialize();

The following line here is the ugly-hack I had to do to make it work,
nothing else I know of makes it possible to import modules from
startup directory. So my question is: Is there a prettier way to do
this?

> PyRun_SimpleString("import sys\nsys.path.append(\"\")");
>
> PyRun_SimpleString("import sys\nprint(sys.path)");
>
> pModuleName = PyUnicode_FromString("stuff");
>
> pTestModule = PyImport_Import(pModuleName);
>
> Py_DECREF(pModuleName);
>
> if (pTestModule != NULL)
>
> { ...

The whole code is here: http://pastebin.com/805BSY8f
You only need a file in the same directory called stuff.py containing
a function def for a function called do_stuff


From zookog at gmail.com  Mon Mar 22 17:19:49 2010
From: zookog at gmail.com (Zooko O'Whielacronx)
Date: Mon, 22 Mar 2010 15:19:49 -0600
Subject: StringChain -- a data structure for managing large sequences of 
	chunks of bytes
In-Reply-To: <cd6401a1003212209l175f26c8t4a8d924a6f823972@mail.gmail.com>
References: <mailman.646.1268377905.23598.python-list@python.org>
	<4b9a00ce$0$27822$c3e8da3@news.astraweb.com>
	<cd6401a1003212209l175f26c8t4a8d924a6f823972@mail.gmail.com>
Message-ID: <cd6401a1003221419r3fe4176cv5040e8cba2b5b4aa@mail.gmail.com>

My apologies; I left out the heading on the last of the four
structures in the benchmark results. Here are those results again with
the missing heading (Stringy) inserted:

Regards,

Zooko
- Hide quoted text -

On Sun, Mar 21, 2010 at 11:09 PM, Zooko O'Whielacronx <zookog at gmail.com> wrote:
>
> impl:  StringChain
> task:  _accumulate_then_one_gulp
>  10000 best: 2.694e+00
>  50000 best: 2.742e+00
>  100000 best: 2.310e+00
>  500000 best: 2.040e+00
> 1000000 best: 1.988e+00
> 5000000 best: 2.193e+00
>
> task:  _alternate_str
>  10000 best: 6.509e+00
>  50000 best: 4.559e+00
>  100000 best: 4.308e+00
>  500000 best: 4.070e+00
> 1000000 best: 3.991e+00
> 5000000 best: 4.000e+00
>
> impl:  SimplerStringChain
> task:  _accumulate_then_one_gulp
>  10000 best: 1.407e+00
>  50000 best: 2.317e+00
>  100000 best: 2.012e+00
>  500000 best: 1.902e+00
> 1000000 best: 1.897e+00
> 5000000 best: 2.104e+00
>
> task:  _alternate_str
>  10000 best: 4.888e+00
>  50000 best: 5.198e+00
>  100000 best: 1.750e+01
>  500000 best: 6.233e+01
> 1000000 best: 1.134e+02
> 5000000 best: 7.599e+02
>
> impl:  StringIOy
> task:  _accumulate_then_one_gulp
>  10000 best: 4.196e+00
>  50000 best: 5.522e+00
>  100000 best: 4.499e+00
>  500000 best: 3.756e+00
> 1000000 best: 4.176e+00
> 5000000 best: 5.414e+00
>
> task:  _alternate_str
>  10000 best: 5.484e+00
>  50000 best: 7.863e+00
>  100000 best: 2.126e+01
>  500000 best: 6.972e+01
> 1000000 best: 1.219e+02
> 5000000 best: 9.463e+02
>
impl:  Stringy
- Hide quoted text -
> task:  _accumulate_then_one_gulp
>  10000 best: 1.502e+00
>  50000 best: 1.420e+01
>  100000 best: 2.245e+01
>  500000 best: 8.577e+01
> 1000000 best: 2.295e+02
> 5000000 best: 1.326e+03
>
> task:  _alternate_str
>  10000 best: 3.290e+00
>  50000 best: 4.220e+00
>  100000 best: 1.665e+01
>  500000 best: 6.281e+01
> 1000000 best: 1.127e+02
> 5000000 best: 7.626e+02
>


From zookog at gmail.com  Mon Mar 22 17:21:53 2010
From: zookog at gmail.com (Zooko O'Whielacronx)
Date: Mon, 22 Mar 2010 15:21:53 -0600
Subject: StringChain -- a data structure for managing large sequences of 
	chunks of bytes
In-Reply-To: <pan.2010.03.22.08.07.48@REMOVE.THIS.cybersource.com.au>
References: <mailman.646.1268377905.23598.python-list@python.org>
	<4b9a00ce$0$27822$c3e8da3@news.astraweb.com>
	<mailman.1055.1269234593.23598.python-list@python.org>
	<pan.2010.03.22.08.07.48@REMOVE.THIS.cybersource.com.au>
Message-ID: <cd6401a1003221421w33b0079ay4811f4e23618b90b@mail.gmail.com>

On Mon, Mar 22, 2010 at 2:07 AM, Steven D'Aprano
<steven at remove.this.cybersource.com.au> wrote:
>
> Perhaps you should have said that it was a wrapper around deque giving
> richer functionality, rather than giving the impression that it was a
> brand new data structure invented by you. People are naturally going to
> be more skeptical about a newly invented data structure than one based on
> a reliable, component like deque.

The fact that StringChain uses deque to hold the queue of strings
isn't that important. I just benchmarked it by swapping in the deque
for a list and using the list costs about one third of a nanosecond
per byte at the scales that the benchmark exercises (namely 10,000,000
bytes in about 10,000 strings). A third of a nanosecond per byte is
about 4% of the runtime.

I also implemented and benchmarked a simpler deque-based scheme which
puts all the actual bytes from the strings into a deque with
self.d.extend(newstr). As you would expect, this shows good asymptotic
performance but the constants are relatively bad so that at all of the
actual loads measured it was three orders of magnitude worse than
StringChain and than String-Chain-with-a-list-instead-of-a-deque.
Moral: the constants matter!

Those benchmarks are appended. You can run the benchmarks yourself per
the README.txt.

But anyway, I take your point and I updated the StringChain README to
explain that it is a pretty simple data structure that holds a list
(actually a deque) of strings and isn't anything too clever or novel.

By the way, we could further micro-optimize this kind of thing if
''.join() would accept either strings or buffers instead of requiring
strings:

>>> ''.join([buffer("abc"), "def"])
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: sequence item 0: expected string, buffer found

Then whenever StringChain needs to slice a string into leading and
trailing parts, it could construct a buffer() viewing each part
instead of making a copy of each part.


> it. Maybe you should consider linking to it on PyPI and seeing if there
> is any interest from others?

http://pypi.python.org/pypi/stringchain

Regards,

Zooko

impl:  StringChain
task:  _accumulate_then_one_gulp
  10000 best: 5.698e+00,   3th-best: 7.486e+00, mean: 7.758e+00,
 100000 best: 4.640e+00,   3th-best: 4.690e+00, mean: 7.674e+00,
 1000000 best: 3.789e+00,   3th-best: 3.806e+00, mean: 3.995e+00,
10000000 best: 4.095e+00,   1th-best: 4.095e+00, mean: 4.095e+00,
task:  _alternate_str
  10000 best: 1.378e+01,   3th-best: 1.390e+01, mean: 1.500e+01,
 100000 best: 9.198e+00,   3th-best: 9.248e+00, mean: 9.385e+00,
 1000000 best: 8.715e+00,   3th-best: 8.755e+00, mean: 8.808e+00,
10000000 best: 8.738e+00,   1th-best: 8.738e+00, mean: 8.738e+00,
impl:  StringChainWithList
task:  _accumulate_then_one_gulp
  10000 best: 3.600e+00,   3th-best: 3.695e+00, mean: 4.129e+00,
 100000 best: 4.070e+00,   3th-best: 4.079e+00, mean: 4.162e+00,
 1000000 best: 3.662e+00,   3th-best: 3.688e+00, mean: 3.721e+00,
10000000 best: 3.902e+00,   1th-best: 3.902e+00, mean: 3.902e+00,
1th-worst: 3.902e+00, worst: 3.902e+00 (of      1)
task:  _alternate_str
  10000 best: 1.369e+01,   3th-best: 1.380e+01, mean: 1.442e+01,
 100000 best: 9.251e+00,   3th-best: 9.289e+00, mean: 9.416e+00,
 1000000 best: 8.809e+00,   3th-best: 8.876e+00, mean: 8.943e+00,
10000000 best: 9.095e+00,   1th-best: 9.095e+00, mean: 9.095e+00,
impl:  Dequey
task:  _accumulate_then_one_gulp
  10000 best: 2.772e+02,   3th-best: 2.785e+02, mean: 2.911e+02,
 100000 best: 2.314e+02,   3th-best: 2.334e+02, mean: 2.422e+02,
 1000000 best: 2.282e+02,   3th-best: 2.288e+02, mean: 2.370e+02,
10000000 best: 2.587e+02,   1th-best: 2.587e+02, mean: 2.587e+02,
task:  _alternate_str
  10000 best: 1.576e+03,   3th-best: 1.580e+03, mean: 1.608e+03,
 100000 best: 1.301e+03,   3th-best: 1.303e+03, mean: 1.306e+03,
 1000000 best: 1.275e+03,   3th-best: 1.276e+03, mean: 1.278e+03,
10000000 best: 1.280e+03,   1th-best: 1.280e+03, mean: 1.280e+03,


From no.email at please.post  Mon Mar 22 18:16:09 2010
From: no.email at please.post (kj)
Date: Mon, 22 Mar 2010 22:16:09 +0000 (UTC)
Subject: How to automate accessor definition?
References: <ho3heq$61v$1@reader1.panix.com>
	<639908184290880449.447600deets-nospam.web.de@news.hansenet.de>
	<ho5j64$22l$1@reader1.panix.com>
	<mailman.1030.1269194878.23598.python-list@python.org>
	<ho7sqi$jq$1@reader1.panix.com>
	<4ba79040$0$22397$426a74cc@news.free.fr>
Message-ID: <ho8q79$8jp$1@reader1.panix.com>

In <4ba79040$0$22397$426a74cc at news.free.fr> Bruno Desthuilliers <bruno.42.desthuilliers at websiteburo.invalid> writes:

>kj a ?crit :
>> PS: BTW, this is not the first time that attempting to set an
>> attribute (in a class written by me even) blows up on me.  It's
>> situations like these that rattle my grasp of attributes, hence my
>> original question about boring, plodding, verbose Java-oid accessors.
>> For me these Python attributes are still waaay too mysterious and
>> unpredictable to rely on.

>Somehow simplified, here's what you have to know:

...

>As I said, this is a somehow simplified description of the process - I 
>skipped the parts about __slots__, __getattribute__ and __setattr__, as 
>well as the part about how function class attributes become methods.
>this should be enough to get an idea of what's going on.


Thank you, sir!  That was quite the education.

(Someday I really should read carefully the official documentation
for the stuff you described, assuming it exists.)

Thanks also for your code suggestions.

~K


From no.email at please.post  Mon Mar 22 18:19:57 2010
From: no.email at please.post (kj)
Date: Mon, 22 Mar 2010 22:19:57 +0000 (UTC)
Subject: short-circuiting any/all ?
References: <ho7vq2$1s5$1@reader1.panix.com>	<291d82b7-b13b-4f49-901c-8194f3e07598@e7g2000yqf.googlegroups.com>
	<ho8d0a$261$1@reader1.panix.com>
	<mailman.1069.1269283393.23598.python-list@python.org>
Message-ID: <ho8qed$ap0$1@reader1.panix.com>

In <mailman.1069.1269283393.23598.python-list at python.org> Tim Golden <mail at timgolden.me.uk> writes:

>On 22/03/2010 18:30, kj wrote:
>> Thanks!  I'm glad to know that one can get the short circuiting
>> using a map-type idiom.  (I prefer map over comprehensions when I
>> don't need to define a function just for the purpose of passing it
>> to it.)

>In what way does "map" over "comprehensions" save you defining a function?

>any (map (is_invalid, L))
>any (is_invalid (i) for i in L)

I was talking in the *general* case.  map at the very least requires
a lambda expression, which is a one-time function defintion.

~K


From steve at holdenweb.com  Mon Mar 22 19:17:00 2010
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 22 Mar 2010 19:17:00 -0400
Subject: DreamPie - The Python shell you've always dreamed about!
In-Reply-To: <15025fc0-c697-4085-81a0-160882767540@15g2000yqi.googlegroups.com>
References: <6c6a96e0-be08-4ec3-a002-0bb9232a8afd@f29g2000yqa.googlegroups.com>	<12cd38b0-1d34-4b1e-96fb-19c3e2f62ab7@e1g2000yqh.googlegroups.com>
	<0fe91504-cb4f-46b6-a327-c5979bb104a6@q16g2000yqq.googlegroups.com>
	<7430987e-3603-4805-b4f4-cae73ca2d3f6@g11g2000yqe.googlegroups.com>
	<b10235a4-586d-4c81-96f4-acaed4d61797@b2g2000yqi.googlegroups.com>
	<15025fc0-c697-4085-81a0-160882767540@15g2000yqi.googlegroups.com>
Message-ID: <ho8tpe$kpg$1@dough.gmane.org>

Luis M. Gonz?lez wrote:
> On Feb 21, 6:40 pm, Mensanator <mensana... at aol.com> wrote:
>> On Feb 21, 12:14 pm, Paul Boddie <p... at boddie.org.uk> wrote:
>>
>>
>>
>>
>>
>>> On 21 Feb, 17:32, Mensanator <mensana... at aol.com> wrote:
>>>> On Feb 21, 10:30 am, Mensanator <mensana... at aol.com> wrote:
>>>>> What versions of Python does it suuport?
>>>> What OS are supported?
>>> From the Web site referenced in the announcement (http://
>>> dreampie.sourceforge.net/):
>>> """
>>> # Supports Python 2.5, Python 2.6, Jython 2.5, IronPython 2.6 and
>>> Python 3.1.
>>> # Works on Windows and Linux.
>>> """
>> Yeah, I saw that. Funny that something important like that wasn't part
>> of the
>> announcement. I notice no mention of Mac OS, so visiting the website
>> was a complete
>> waste of time on my part, wasn't it?
>>
>>
>>
>>> Paul
> 
> Geez... someone spends many hours (or days or even months) writing a
> program to be offered for free to the world, and you get annoyed by
> losing two seconds while checking it out?

And if it's open source there's always the possibility of doing a Mac
port and contributing the code back.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From tan at nowhere.land  Mon Mar 22 19:40:16 2010
From: tan at nowhere.land (tan)
Date: Mon, 22 Mar 2010 23:40:16 GMT
Subject: GC is very expensive: am I doing something wrong?
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
	<mailman.963.1268958842.23598.python-list@python.org>
	<ho6ai4$b12$2@lust.ihug.co.nz>
	<mailman.1060.1269243742.23598.python-list@python.org>
Message-ID: <ho8v4q$a4q$2@news.eternal-september.org>

In article <mailman.1060.1269243742.23598.python-list at python.org>, Stefan Behnel <stefan_ml at behnel.de> wrote:
>Lawrence D'Oliveiro, 22.03.2010 00:36:
>> Terry Reedy wrote:
>>> No one has discovered a setting
>>> of the internal tuning parameters for which there are no bad patterns
>>> and I suspect there are not any such. This does not negate Xavier's
>>> suggestion that a code change might also solve your problem.
>>
>> Could it be that for implementing a structure like a trie as the OP is,
>> where a lot of CPU cycles can be spent manipulating the structure, a high-
>> level language like Python, Perl or Ruby just gets in the way?
>
>I would rather say that the specific problem of the trie data structure is 
>that it has extremely little benefit over other available data structures.

Not true.
 
>There may still be a couple of niches where it makes sense to consider it 
>as an alternative, but given that dicts are so heavily optimised in Python, 
>it'll be hard for tries to compete even when written in a low-level language.

It depends. If your data is not in nearly sorted order,
trees are some of the best mechanisms available.

>Remember that the original use case was to load a dictionary from a text 
>file. For this use case, a trie can be very wasteful in terms of memory and 
>rather CPU cache unfriendly on traversal, whereas hash values are a) rather 
>fast to calculate for a string, and b) often just calculated once and then 
>kept alive in the string object for later reuse.

You still have to walk the bucket in a hash map/table.
Performance may be orders of magnitude worse than for trees.

>> My feeling would be, try to get the language to do as much of the work for
>> you as possible. If you can???t do that, then you might be better off with a
>> lower-level language.
>
>I agree with the first sentence, but I'd like to underline the word 'might' 
>in the second. As this newsgroup shows, very often it's enough to look for 
>a better algorithmic approach first.
>
>Stefan
>

--
You want to know who you are?

http://oshosearch.net/Convert/search.php

Most Osho books on line:

http://oshosearch.net



From vlastimil.brom at gmail.com  Mon Mar 22 20:19:04 2010
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Tue, 23 Mar 2010 01:19:04 +0100
Subject: individually updating unicodedata db?
Message-ID: <9fdb569a1003221719k50345867vfc4a47683e877aae@mail.gmail.com>

Hi all,
I just tried to find some information about the unicodedata database
and the possibilities of updating it to the latest version of the
unicode standards (currently 5.2, while python supports 5.1 in the
latest versions).
An option to update this database individually might be useful as the
unicode standard updates seem to be more frequent than the official
python releases (and not every release is updated to the latest
available unicode db version either).
Am I right, that this is not possible without recompiling python from source?
I eventually found the promissing file
...Python-src--2.6.5\Python-2.6.5\Tools\unicode\makeunicodedata.py
which required the following files from the unicode database to be in
the same folder:
EastAsianWidth-3.2.0.txt
UnicodeData-3.2.0.txt
CompositionExclusions-3.2.0.txt
UnicodeData.txt
EastAsianWidth.txt
CompositionExclusions.txt

and also
Modules/unicodedata_db.h
Modules/unicodename_db.h,
Objects/unicodetype_db.h

After a minor correction - addig the missing "import re" - the script
was able to run and recreate the above h files.
I guess, I am stuck here, as I use the precompiled version supplied in
the windows installer and can't compile python from source to obtain
the needed unicodedata.pyd.
Or are there any possibilities I missed to individually upgrade the
unicodedata databese? (Using Python 2.6.5, Win XPh SP3)

Thanks in advance for any hints,
   vbr


From hawat.thufir at gmail.com  Mon Mar 22 20:23:27 2010
From: hawat.thufir at gmail.com (Thufir)
Date: Mon, 22 Mar 2010 17:23:27 -0700 (PDT)
Subject: google token
References: <uo0pn.52098$2r7.8254@newsfe05.iad>
	<4ba49f98$0$27838$c3e8da3@news.astraweb.com>
Message-ID: <4f5d2017-8d64-4d4c-b013-b49b4c199005@v20g2000prc.googlegroups.com>

On Mar 20, 3:12 am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Sat, 20 Mar 2010 09:17:14 +0000, Thufir wrote:
> > I'd like to acquire a token, as below, but from Java:
>
> Perhaps you should be asking a Java discussion group? This group is for
> discussing Python.
>
> --
> Steven


What I meant to ask is, how is that token being acquired?  Is that
just a GET?



thanks,

Thufir


From python at mrabarnett.plus.com  Mon Mar 22 21:27:28 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 23 Mar 2010 01:27:28 +0000
Subject: individually updating unicodedata db?
In-Reply-To: <9fdb569a1003221719k50345867vfc4a47683e877aae@mail.gmail.com>
References: <9fdb569a1003221719k50345867vfc4a47683e877aae@mail.gmail.com>
Message-ID: <4BA81900.6000505@mrabarnett.plus.com>

Vlastimil Brom wrote:
> Hi all,
> I just tried to find some information about the unicodedata database
> and the possibilities of updating it to the latest version of the
> unicode standards (currently 5.2, while python supports 5.1 in the
> latest versions).
> An option to update this database individually might be useful as the
> unicode standard updates seem to be more frequent than the official
> python releases (and not every release is updated to the latest
> available unicode db version either).
> Am I right, that this is not possible without recompiling python from source?
> I eventually found the promissing file
> ...Python-src--2.6.5\Python-2.6.5\Tools\unicode\makeunicodedata.py
> which required the following files from the unicode database to be in
> the same folder:
> EastAsianWidth-3.2.0.txt
> UnicodeData-3.2.0.txt
> CompositionExclusions-3.2.0.txt
> UnicodeData.txt
> EastAsianWidth.txt
> CompositionExclusions.txt
> 
> and also
> Modules/unicodedata_db.h
> Modules/unicodename_db.h,
> Objects/unicodetype_db.h
> 
> After a minor correction - addig the missing "import re" - the script
> was able to run and recreate the above h files.
> I guess, I am stuck here, as I use the precompiled version supplied in
> the windows installer and can't compile python from source to obtain
> the needed unicodedata.pyd.
> Or are there any possibilities I missed to individually upgrade the
> unicodedata databese? (Using Python 2.6.5, Win XPh SP3)
> 
> Thanks in advance for any hints,
>    vbr

 From the look of it the Unicode data is compiled into the DLL, but I
don't see any reason, other than speed, why preprocessed data couldn't
be read from a file at startup by the DLL, provided that the format 
hasn't changed, eg new fields added, without affecting the DLL's
interface to the rest of Python.


From steven at REMOVE.THIS.cybersource.com.au  Mon Mar 22 21:30:37 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 23 Mar 2010 01:30:37 GMT
Subject: short-circuiting any/all ?
References: <ho7vq2$1s5$1@reader1.panix.com>
	<291d82b7-b13b-4f49-901c-8194f3e07598@e7g2000yqf.googlegroups.com>
	<ho8d0a$261$1@reader1.panix.com>
	<mailman.1069.1269283393.23598.python-list@python.org>
	<ho8qed$ap0$1@reader1.panix.com>
Message-ID: <pan.2010.03.23.01.30.37@REMOVE.THIS.cybersource.com.au>

On Mon, 22 Mar 2010 22:19:57 +0000, kj wrote:

> In <mailman.1069.1269283393.23598.python-list at python.org> Tim Golden
> <mail at timgolden.me.uk> writes:
> 
>>On 22/03/2010 18:30, kj wrote:
>>> Thanks!  I'm glad to know that one can get the short circuiting using
>>> a map-type idiom.  (I prefer map over comprehensions when I don't need
>>> to define a function just for the purpose of passing it to it.)
> 
>>In what way does "map" over "comprehensions" save you defining a
>>function?
> 
>>any (map (is_invalid, L))
>>any (is_invalid (i) for i in L)
> 
> I was talking in the *general* case.  map at the very least requires a
> lambda expression, which is a one-time function defintion.

But keep in mind that instead of this:


map(lambda x,y: x+y, somelist)

you can do this:

import operator
map(operator.add, somelist)


In any case, the once-off cost of creating or importing a function is 
usually quite cheap. As usual, the best advise is not to worry about 
optimization until you have profiled the code and learned where the 
actual bottlenecks are. Write what reads best, not what you guess might 
be faster, until you really know you need the speed and that it is an 
optimization and not a pessimation.



-- 
Steven


From solipsis at pitrou.net  Mon Mar 22 22:11:57 2010
From: solipsis at pitrou.net (Antoine Pitrou)
Date: Tue, 23 Mar 2010 02:11:57 +0000 (UTC)
Subject: GC is very expensive: am I doing something wrong?
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
	<mailman.963.1268958842.23598.python-list@python.org>
	<ho6ai4$b12$2@lust.ihug.co.nz>
	<mailman.1060.1269243742.23598.python-list@python.org>
	<ho8v4q$a4q$2@news.eternal-september.org>
Message-ID: <ho981d$ehv$1@dough.gmane.org>

Le Mon, 22 Mar 2010 23:40:16 +0000, tan a ?crit?:
> 
>>Remember that the original use case was to load a dictionary from a text
>>file. For this use case, a trie can be very wasteful in terms of memory
>>and rather CPU cache unfriendly on traversal, whereas hash values are a)
>>rather fast to calculate for a string, and b) often just calculated once
>>and then kept alive in the string object for later reuse.
> 
> You still have to walk the bucket in a hash map/table. Performance may
> be orders of magnitude worse than for trees.

"walk the bucket" shouldn't be a significant cost factor here, especially 
if you are doing meaningful work with the traversed items. In the CPython 
implementation the total hash table size is less than a constant times 
the number of actual items. Moreover, it's a linear scan over an array 
rather than having to dereference pointers as in tree.

"Orders of magnitude worse", in any case, sounds very exaggerated.

(and, of course, as the OP said, there's the major difference that the 
dict type is implemented in C, which makes constant factors an order of 
magnitude smaller than for a Python trie implementation)



From no.email at please.post  Mon Mar 22 22:26:20 2010
From: no.email at please.post (kj)
Date: Tue, 23 Mar 2010 02:26:20 +0000 (UTC)
Subject: short-circuiting any/all ?
References: <ho7vq2$1s5$1@reader1.panix.com>
	<291d82b7-b13b-4f49-901c-8194f3e07598@e7g2000yqf.googlegroups.com>
	<ho8d0a$261$1@reader1.panix.com>
	<mailman.1069.1269283393.23598.python-list@python.org>
	<ho8qed$ap0$1@reader1.panix.com>
	<pan.2010.03.23.01.30.37@REMOVE.THIS.cybersource.com.au>
Message-ID: <ho98sc$abv$1@reader1.panix.com>

In <pan.2010.03.23.01.30.37 at REMOVE.THIS.cybersource.com.au> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:

>On Mon, 22 Mar 2010 22:19:57 +0000, kj wrote:

>In any case, the once-off cost of creating or importing a function is 
>usually quite cheap. As usual, the best advise is not to worry about 
>optimization until you have profiled the code and learned where the 
>actual bottlenecks are. Write what reads best, not what you guess might 
>be faster, until you really know you need the speed and that it is an 
>optimization and not a pessimation.


My preference for map in this case is not due to performance
considerations, but to avoid unnecessary code-clutter.  I just
find, e.g.,

  x = map(int, y)

slightly easier on the eyes than

  x = [int(z) for z in y]

This tiny improvement in readability gets negated if one needs to
define a function in order to use map.  Hence, e.g., I prefer

  x = [_[0] for _ in y]

over

  x = map(lambda _: _[0], y)

and certainly over

  def _first(seq):
     return seq[0]
  x = map(_first, y)

Arguably, Knuth's "premature optimization is the root of all evil"
applies even to readability (e.g. "what's the point of making code
optimally readable if one is going to change it completely next
day?")  If there were the equivalent of a profiler for code clutter,
I guess I could relax my readability standards a bit...

~K


From rami.chowdhury at gmail.com  Mon Mar 22 22:59:18 2010
From: rami.chowdhury at gmail.com (Rami Chowdhury)
Date: Mon, 22 Mar 2010 19:59:18 -0700
Subject: google token
In-Reply-To: <4f5d2017-8d64-4d4c-b013-b49b4c199005@v20g2000prc.googlegroups.com>
References: <uo0pn.52098$2r7.8254@newsfe05.iad>
	<4ba49f98$0$27838$c3e8da3@news.astraweb.com>
	<4f5d2017-8d64-4d4c-b013-b49b4c199005@v20g2000prc.googlegroups.com>
Message-ID: <201003221959.19307.rami.chowdhury@gmail.com>

On Monday 22 March 2010 17:23:27 Thufir wrote:
> On Mar 20, 3:12 am, Steven D'Aprano <st... at REMOVE-THIS-
> 
> cybersource.com.au> wrote:
> > On Sat, 20 Mar 2010 09:17:14 +0000, Thufir wrote:
> > > I'd like to acquire a token, as below, but from Java:
> > Perhaps you should be asking a Java discussion group? This group is for
> > discussing Python.
> > 
> > --
> > Steven
> 
> What I meant to ask is, how is that token being acquired?  Is that
> just a GET?
> 

Looks like it -- a urllib2 request, anyway -- the self._web object is defined 
here: http://pyrfeed.googlecode.com/svn/trunk/lib/web/web.py

> 
> 
> thanks,
> 
> Thufir

----
Rami Chowdhury
"Any sufficiently advanced incompetence is indistinguishable from malice." -- 
Grey's Law
408-597-7068 (US) / 07875-841-046 (UK) / 01819-245544 (BD)


From timr at probo.com  Tue Mar 23 00:22:28 2010
From: timr at probo.com (Tim Roberts)
Date: Mon, 22 Mar 2010 21:22:28 -0700
Subject: device identification
References: <9c7ed2c8-f04b-4302-a4be-bde1628ef966@y11g2000prf.googlegroups.com>
Message-ID: <46ggq59e49qpna7f9ae6q8ftobhot351un@4ax.com>

Omer Ihsan <omrihsan at gmail.com> wrote:
>
>i have installed pyusb now and run the sample usbenum.py....i have 3
>usb ports on my PC but the results show 6 outputs to
>dev.filename..they are numbers like 001 or 005 etc.... and they
>changed when i plugged in devices...(i am no good with the usb
>standards)....i just want to identify each device/port... what
>parameter in the example would help me....

You can't identify the ports.[1]  What good would it do you?  The ports on
your PC are not numbered.

You certainly CAN identify the devices, by their VID and PID (or idVendor
and idProduct).  You identify by function, not by location.  When you plug
in a USB drive, you don't want to worry about where it's plugged in.
===
[1]: OK, technically, it is not impossible to identify the port numbers,
but it is quite tedious.  You need to chase through the sysfs expansion of
your buses hub/port tree and find a match for your device.  It's not worth
the trouble.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From no.email at nospam.invalid  Tue Mar 23 01:05:40 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Mon, 22 Mar 2010 22:05:40 -0700
Subject: GC is very expensive: am I doing something wrong?
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
	<mailman.963.1268958842.23598.python-list@python.org>
	<ho6ai4$b12$2@lust.ihug.co.nz>
	<mailman.1060.1269243742.23598.python-list@python.org>
	<ho8v4q$a4q$2@news.eternal-september.org>
	<mailman.1076.1269310331.23598.python-list@python.org>
Message-ID: <7xwrx3mxuj.fsf@ruckus.brouhaha.com>

Antoine Pitrou <solipsis at pitrou.net> writes:
> "Orders of magnitude worse", in any case, sounds very exaggerated.

The worst case can lose orders of magnitude if a lot of values hash
to the same bucket.


From gagsl-py2 at yahoo.com.ar  Tue Mar 23 02:12:54 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 23 Mar 2010 03:12:54 -0300
Subject: Castrated traceback in sys.exc_info()
References: <7866674b-46ba-49e2-9d76-e8259ba22df0@z3g2000yqz.googlegroups.com>
	<20100317124019.7013dfa3@moriz.interne>
	<9fd96c3b1003170542t4ea864c6y359107cb747536da@mail.gmail.com>
	<op.u9uflwxxx6zn5v@lepton.softlabbsas.com.ar>
	<4BA7B4F7.6080404@wanadoo.fr>
Message-ID: <op.u90bjsorx6zn5v@lepton.softlabbsas.com.ar>

En Mon, 22 Mar 2010 15:20:39 -0300, Pascal Chambon  
<chambon.pascal at wanadoo.fr> escribi?:
>
> Allright, here is more concretely the problem :
>
> ERROR:root:An error
> Traceback (most recent call last):
>   File "C:/Users/Pakal/Desktop/aaa.py", line 7, in c
>     return d()
>   File "C:/Users/Pakal/Desktop/aaa.py", line 11, in d
>     def d(): raise ValueError
> ValueError
>  >>>
>
> As you see, the traceback only starts from function c, which handles the  
> exception.
> It doesn't show main(), a() and b(), which might however be (and are, in  
> my case) critical to diagnose the severity of the problem (since many  
> different paths would lead to calling c()).
>
> So the question is : is that possible to enforce, by a way or another,  
> the retrieval of the FULL traceback at exception raising point, instead  
> of that incomplete one ?

Thanks for bringing this topic! I learned a lot trying to understand what  
happens.

The exception traceback (what sys.exc_info()[2] returns) is *not* a  
complete stack trace. The sys module documentation is wrong [1] when it  
says "...encapsulates the call stack at the point where the exception  
originally occurred."

The Language Reference is more clear [2]: "Traceback objects represent a  
stack trace of an exception. A traceback object is created when an  
exception occurs. When the search for an exception handler unwinds the  
execution stack, at each unwound level a traceback object is inserted in  
front of the current traceback. When an exception handler is entered, the  
stack trace is made available to the program."

That is, a traceback holds only the *forward* part of the stack: the  
frames already exited when looking for an exception handler. Frames going  
 from the program starting point up to the current execution point are  
*not* included.

Conceptually, it's like having two lists: stack and traceback. The  
complete stack trace is always stack+traceback. At each step (when  
unwinding the stack, looking for a frame able to handle the current  
exception) an item is popped from the top of the stack (last item) and  
inserted at the head of the traceback.

The traceback holds the "forward" path (from the current execution point,  
to the frame where the exception was actually raised). It's a linked list,  
its tb_next attribute holds a reference to the next item; None marks the  
last one.

The "back" path (going from the current execution point to its caller and  
all the way to the program entry point) is a linked list of frames; the  
f_back attribute points to the previous one, or None.

In order to show a complete stack trace, one should combine both. The  
traceback module contains several useful functions: extract_stack() +  
extract_tb() are a starting point. The simplest way I could find to make  
the logging module report a complete stack is to monkey patch  
logging.Formatter.formatException so it uses format_exception() and  
format_stack() combined (in fact it is simpler than the current  
implementation using a StringIO object):

<code>
import logging
import traceback

def formatException(self, ei):
     """
     Format and return the specified exception information as a string.

     This implementation builds the complete stack trace, combining
     traceback.format_exception and traceback.format_stack.
     """
     lines = traceback.format_exception(*ei)
     if ei[2]:
         lines[1:1] = traceback.format_stack(ei[2].tb_frame.f_back)
     return ''.join(lines)

# monkey patch the logging module
logging.Formatter.formatException = formatException

def a(): return b()
def b(): return c()
def c():
     try:
       return d()
     except:
       logging.exception("An error")
       raise
def d(): raise ValueError

def main():
   a()

main()
</code>

Output:

ERROR:root:An error
Traceback (most recent call last):
   File "test_logging.py", line 32, in <module>
     main()
   File "test_logging.py", line 30, in main
     a()
   File "test_logging.py", line 19, in a
     def a(): return b()
   File "test_logging.py", line 20, in b
     def b(): return c()
   File "test_logging.py", line 23, in c
     return d()
   File "test_logging.py", line 27, in d
     def d(): raise ValueError
ValueError

Traceback (most recent call last):
   File "test_logging.py", line 32, in <module>
     main()
   File "test_logging.py", line 30, in main
     a()
   File "test_logging.py", line 19, in a
     def a(): return b()
   File "test_logging.py", line 20, in b
     def b(): return c()
   File "test_logging.py", line 23, in c
     return d()
   File "test_logging.py", line 27, in d
     def d(): raise ValueError
ValueError

Note that both tracebacks are identical: the first comes from the patched  
logging module, the second is the standard Python one.

[1] http://docs.python.org/library/sys.html#sys.exc_info
[2]  
http://docs.python.org/reference/datamodel.html#the-standard-type-hierarchy

-- 
Gabriel Genellina



From steven at REMOVE.THIS.cybersource.com.au  Tue Mar 23 02:32:13 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 23 Mar 2010 06:32:13 GMT
Subject: GC is very expensive: am I doing something wrong?
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
	<mailman.963.1268958842.23598.python-list@python.org>
	<ho6ai4$b12$2@lust.ihug.co.nz>
	<mailman.1060.1269243742.23598.python-list@python.org>
	<ho8v4q$a4q$2@news.eternal-september.org>
	<mailman.1076.1269310331.23598.python-list@python.org>
	<7xwrx3mxuj.fsf@ruckus.brouhaha.com>
Message-ID: <pan.2010.03.23.06.32.14@REMOVE.THIS.cybersource.com.au>

On Mon, 22 Mar 2010 22:05:40 -0700, Paul Rubin wrote:

> Antoine Pitrou <solipsis at pitrou.net> writes:
>> "Orders of magnitude worse", in any case, sounds very exaggerated.
> 
> The worst case can lose orders of magnitude if a lot of values hash to
> the same bucket.


Well, perhaps one order of magnitude.


>>> for i in xrange(100):
...     n = 32*i+1
...     assert hash(2**n) == hash(2)
...
>>> d1 = dict.fromkeys(xrange(100))
>>> d2 = dict.fromkeys([2**(32*i+1) for i in xrange(100)])
>>>
>>> from timeit import Timer
>>> setup = "from __main__ import d1, d2"
>>> t1 = Timer("for k in d1.keys(): x = d1[k]", setup)
>>> t2 = Timer("for k in d2.keys(): x = d2[k]", setup)
>>>
>>> min(t1.repeat(number=1000, repeat=5))
0.026707887649536133
>>> min(t2.repeat(number=1000, repeat=5))
0.33103203773498535




-- 
Steven


From gagsl-py2 at yahoo.com.ar  Tue Mar 23 03:07:47 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 23 Mar 2010 04:07:47 -0300
Subject: Problem with sys.path when embedding Python3 in C
References: <2cf430a61003221419t2192c9aajd3c2d2922b1d7f12@mail.gmail.com>
Message-ID: <op.u90d29ajx6zn5v@lepton.softlabbsas.com.ar>

En Mon, 22 Mar 2010 18:19:49 -0300, Krister Svanlund  
<krister.svanlund at gmail.com> escribi?:

> Hi, I've recently begun experimenting with embedding python and i got
> a small problem.
>
> The following line here is the ugly-hack I had to do to make it work,
> nothing else I know of makes it possible to import modules from
> startup directory. So my question is: Is there a prettier way to do
> this?

The startup directory is not included in the module search path - neither  
in your embedded version, nor in the standard interpreter (it's only  
included when running in interactive mode).

>> PyRun_SimpleString("import sys\nsys.path.append(\"\")");

If you really want the current directory in sys.path, use the getcwd  
function to obtain it. But make sure this is what you want - the directory  
containing the executable might be a better choice (at least more  
predictable).
Note that Python already provides lots of ways to add directories to  
sys.path (the default search path (see site.py), per-user site directories  
(see PEP370), .pth files, the PYTHONPATH and PYTHONHOME environment  
variables, the Windows registry, other ways I forgot...) So I'd ask why do  
you want to add a non-standard one.

In C code, you can alter the initial search path by setting   
Py_SetProgramName and Py_SetPythonHome. And you may even completely  
replace getpathp.c source file with your own.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Tue Mar 23 03:22:59 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 23 Mar 2010 04:22:59 -0300
Subject: individually updating unicodedata db?
References: <9fdb569a1003221719k50345867vfc4a47683e877aae@mail.gmail.com>
Message-ID: <op.u90eslyux6zn5v@lepton.softlabbsas.com.ar>

En Mon, 22 Mar 2010 21:19:04 -0300, Vlastimil Brom  
<vlastimil.brom at gmail.com> escribi?:

> I guess, I am stuck here, as I use the precompiled version supplied in
> the windows installer and can't compile python from source to obtain
> the needed unicodedata.pyd.

You can recompile Python from source, on Windows, using the free  
Microsoft? Visual C++? 2008 Express Edition.
http://www.microsoft.com/express/Windows/

Fetch the required dependencies using Tools\buildbot\external.bat, and  
then execute PCbuild\env.bat and build.bat. See readme.txt in that  
directory for details. It should build cleanly.

-- 
Gabriel Genellina



From vinay_sajip at yahoo.co.uk  Tue Mar 23 04:10:36 2010
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Tue, 23 Mar 2010 01:10:36 -0700 (PDT)
Subject: logging: local functions ==> loss of lineno
References: <mailman.576.1268256192.23598.python-list@python.org> 
	<hnaj9c$i0u$02$1@news.t-online.com> <4BA295A1.70207@hellmutweber.de> 
	<mailman.972.1268995215.23598.python-list@python.org>
	<hnvqe5$vc$02$1@news.t-online.com> 
	<mailman.977.1269006574.23598.python-list@python.org>
	<ho21dt$b6v$00$1@news.t-online.com>
Message-ID: <d35c950b-c6e5-4162-8175-3e0a0255c71a@30g2000yqi.googlegroups.com>

On Mar 20, 8:36?am, Peter Otten <__pete... at web.de> wrote:
> Jean-Michel Pichavant wrote:
> > You are still accessing the private attribute of the ?modulelogging.
>
> Just reading it is a significantly more conservative approach than setting
> it to an object with an unusual notion of equality ;)
>
> > My previous remark was misleading, in fact there's nothing you can do
> > about it.
>
> How about replacinglogging._srcfile with fixname(logging.__file__)?
>
> > _srcfile is not meant to be used elsewhere than in theloggingmodule
> > itself.
> > However, I don't wanna sound like I'm rejecting this solution, 1st the
> > OP is satisified with it and since this solution is working, it is still
> > more helpful than anyone noticing that you've accessed a private
> > attribute (some will successfully argue that python allows to do so).
>
> Yeah, I had hoped that I could get away without drawing the "consenting
> adults" wildcard...
>
> > At the very begining of this thread I've provided a complete different
> > approach, instead of using the builtin 'filename' and 'lineno' field of
> > thelogging, use custom fileds with the extra parameter.
>
> > It has also some drawbacks but could be a possible alternative.
>
> Having two filename/lineno sets ist likely to confuse.
>
> Peter

Guys,

Sorry I'm a little late to this discussion. I could add a _findCaller
function to the module (not part of the public API, but replaceable by
someone who really needs to) which does the heavy lifting, and
Logger.findCaller just calls it. Then those who need to can implement
their own strategy, without needing to jump through hoops. Does that
approach sound helpful?

Regards,

Vinay Sajip


From no.email at nospam.invalid  Tue Mar 23 04:17:32 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Tue, 23 Mar 2010 01:17:32 -0700
Subject: GC is very expensive: am I doing something wrong?
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
	<mailman.963.1268958842.23598.python-list@python.org>
	<ho6ai4$b12$2@lust.ihug.co.nz>
	<mailman.1060.1269243742.23598.python-list@python.org>
	<ho8v4q$a4q$2@news.eternal-september.org>
	<mailman.1076.1269310331.23598.python-list@python.org>
	<7xwrx3mxuj.fsf@ruckus.brouhaha.com>
	<pan.2010.03.23.06.32.14@REMOVE.THIS.cybersource.com.au>
Message-ID: <7xr5nbwixv.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
> Well, perhaps one order of magnitude.
>>>> for i in xrange(100):
> ...     n = 32*i+1
> ...     assert hash(2**n) == hash(2)

Try with much more than 100 items (you might want to construct the
entries a little more intricately to avoid such big numbers).  The point
is that access becomes O(N) instead of O(1).  See:

   http://www.cs.rice.edu/~scrosby/hash/

for the consequences.  http://cr.yp.to/critbit.html  discusses the
issue a little more.


From __peter__ at web.de  Tue Mar 23 04:43:54 2010
From: __peter__ at web.de (Peter Otten)
Date: Tue, 23 Mar 2010 09:43:54 +0100
Subject: GC is very expensive: am I doing something wrong?
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
	<mailman.963.1268958842.23598.python-list@python.org>
	<ho6ai4$b12$2@lust.ihug.co.nz>
	<mailman.1060.1269243742.23598.python-list@python.org>
	<ho8v4q$a4q$2@news.eternal-september.org>
	<mailman.1076.1269310331.23598.python-list@python.org>
	<7xwrx3mxuj.fsf@ruckus.brouhaha.com>
	<pan.2010.03.23.06.32.14@REMOVE.THIS.cybersource.com.au>
Message-ID: <ho9uvs$mqe$03$1@news.t-online.com>

Steven D'Aprano wrote:

> On Mon, 22 Mar 2010 22:05:40 -0700, Paul Rubin wrote:
> 
>> Antoine Pitrou <solipsis at pitrou.net> writes:
>>> "Orders of magnitude worse", in any case, sounds very exaggerated.
>> 
>> The worst case can lose orders of magnitude if a lot of values hash to
>> the same bucket.
> 
> 
> Well, perhaps one order of magnitude.
> 
> 
>>>> for i in xrange(100):
> ...     n = 32*i+1
> ...     assert hash(2**n) == hash(2)
> ...
>>>> d1 = dict.fromkeys(xrange(100))
>>>> d2 = dict.fromkeys([2**(32*i+1) for i in xrange(100)])
>>>>
>>>> from timeit import Timer
>>>> setup = "from __main__ import d1, d2"
>>>> t1 = Timer("for k in d1.keys(): x = d1[k]", setup)
>>>> t2 = Timer("for k in d2.keys(): x = d2[k]", setup)
>>>>
>>>> min(t1.repeat(number=1000, repeat=5))
> 0.026707887649536133
>>>> min(t2.repeat(number=1000, repeat=5))
> 0.33103203773498535

But the ratio grows with the number of collisions:

$ python extrapolate.py            
10                                 
0.00120401382446                   
0.00753307342529                   
ratio: 6.25663366337               

100
0.00542402267456
0.316139936447  
ratio: 58.2851428571

1000
0.00553417205811
3.36690688133
ratio: 608.384930209

$ cat extrapolate.py
from timeit import Timer

class Item(object):
    def __init__(self, value, hash=None):
        self.value = value
        self.hash = value if hash is None else hash
    def __eq__(self, other):
        return self.value == other.value
    def __hash__(self):
        return self.hash

setup = "from __main__ import d"
bench = "for k in d: x = d[k]"

for n, number in (10,100), (100,100), (1000,10):
    print n
    d1 = dict.fromkeys(Item(i) for i in xrange(n))
    d2 = dict.fromkeys(Item(i, 0) for i in xrange(n))
    ab = []
    for d in d1, d2:
        t = Timer(bench, setup)
        ab.append(min(t.repeat(number=number, repeat=3)))
        print ab[-1]
    print "ratio:", ab[1]/ab[0]
    print


See also http://xkcd.com/605/

Peter


From bruno.42.desthuilliers at websiteburo.invalid  Tue Mar 23 05:13:05 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Tue, 23 Mar 2010 10:13:05 +0100
Subject: How to automate accessor definition?
In-Reply-To: <4ba7aa87$0$4974$607ed4bc@cv.net>
References: <ho3heq$61v$1@reader1.panix.com>
	<639908184290880449.447600deets-nospam.web.de@news.hansenet.de>
	<ho5j64$22l$1@reader1.panix.com>
	<mailman.1030.1269194878.23598.python-list@python.org>
	<ho7sqi$jq$1@reader1.panix.com>
	<4ba79040$0$22397$426a74cc@news.free.fr>
	<4ba7aa87$0$4974$607ed4bc@cv.net>
Message-ID: <4ba8861b$0$17824$426a74cc@news.free.fr>

John Posner a ?crit :
> On 3/22/2010 11:44 AM, Bruno Desthuilliers wrote:
> 
> <snip>
> 
>> Another (better IMHO) solution is to use a plain property, and store the
>> computed value as an implementation attribute :
>>
>> @property
>> def foo(self):
>> cached = self.__dict__.get('_foo_cache')
>> if cached is None:
>> self._foo_cache = cached = self._some_time_consuming_operation()
>> return cached
>>
> 
> There's no need to access __dict__ directly.

Nope, inded. I guess I wrote it that way to make clear that we were 
looking for an instance attribute (as a sequel of my previous writing on 
attribute lookup rules).

> I believe this is 
> equivalent (and clearer):
> 
>  @property
>  def foo(self):
>      try:
>          cached = self._foo_cache
>      except AttributeError:
>          self._foo_cache = cached = self._time_consuming_op()
>      return cached
> 

This is functionally _almost_ equivalent - won't work the same if 
there's a class attribute "_foo_cache", which might or not be a good 
thing !-)

Will possibly be a bit faster after the first access - IIRC setting up 
an error handler is by itself cheaper than doing a couple attribute 
access and a method call - but I'd timeit before worrying about it.


From krister.svanlund at gmail.com  Tue Mar 23 05:23:53 2010
From: krister.svanlund at gmail.com (Krister Svanlund)
Date: Tue, 23 Mar 2010 10:23:53 +0100
Subject: Problem with sys.path when embedding Python3 in C
In-Reply-To: <op.u90d29ajx6zn5v@lepton.softlabbsas.com.ar>
References: <2cf430a61003221419t2192c9aajd3c2d2922b1d7f12@mail.gmail.com>
	<op.u90d29ajx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <2cf430a61003230223i32c06f01je20e698c119b1bb1@mail.gmail.com>

On Tue, Mar 23, 2010 at 8:07 AM, Gabriel Genellina
<gagsl-py2 at yahoo.com.ar> wrote:
> En Mon, 22 Mar 2010 18:19:49 -0300, Krister Svanlund
> <krister.svanlund at gmail.com> escribi?:
>
>> Hi, I've recently begun experimenting with embedding python and i got
>> a small problem.
>>
>> The following line here is the ugly-hack I had to do to make it work,
>> nothing else I know of makes it possible to import modules from
>> startup directory. So my question is: Is there a prettier way to do
>> this?
>
> The startup directory is not included in the module search path - neither in
> your embedded version, nor in the standard interpreter (it's only included
> when running in interactive mode).
>
>>> PyRun_SimpleString("import sys\nsys.path.append(\"\")");
>
> If you really want the current directory in sys.path, use the getcwd
> function to obtain it. But make sure this is what you want - the directory
> containing the executable might be a better choice (at least more
> predictable).
> Note that Python already provides lots of ways to add directories to
> sys.path (the default search path (see site.py), per-user site directories
> (see PEP370), .pth files, the PYTHONPATH and PYTHONHOME environment
> variables, the Windows registry, other ways I forgot...) So I'd ask why do
> you want to add a non-standard one.
>
> In C code, you can alter the initial search path by setting
> ?Py_SetProgramName and Py_SetPythonHome. And you may even completely replace
> getpathp.c source file with your own.
>
> --
> Gabriel Genellina
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>

The thing is that I want the application to be able to import modules
I've written, but yeah, the applications directory is what I want
rather than the cwd. I have tried Py_SetProgramName but haven't gotten
it to work or cause any change at all to the import behaviour. Could
you possibly provide som sort of example?


From no.email at nospam.invalid  Tue Mar 23 05:57:56 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Tue, 23 Mar 2010 02:57:56 -0700
Subject: GC is very expensive: am I doing something wrong?
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
	<mailman.963.1268958842.23598.python-list@python.org>
	<ho6ai4$b12$2@lust.ihug.co.nz>
	<mailman.1060.1269243742.23598.python-list@python.org>
	<ho8v4q$a4q$2@news.eternal-september.org>
	<mailman.1076.1269310331.23598.python-list@python.org>
	<7xwrx3mxuj.fsf@ruckus.brouhaha.com>
	<mailman.1083.1269338807.23598.python-list@python.org>
Message-ID: <7xpr2v2wd7.fsf@ruckus.brouhaha.com>

Stefan Behnel <stefan_ml at behnel.de> writes:
> While this is theoretically true, and it's good to be aware of this
> possibility, common string hash functions make it so rare in practice
> that a hash table will almost always outperform a trie for exact
> lookups. If it happens, it will either show up clearly enough in
> benchmarks or not be worth bothering.

It is unlikely to happen by accident.  You might care that it can
happen on purpose.  See: http://www.cs.rice.edu/~scrosby/hash/
that I cited in another post.  The article shows some sample attacks
on Python cgi's.



From stefan_ml at behnel.de  Tue Mar 23 06:05:36 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 23 Mar 2010 11:05:36 +0100
Subject: GC is very expensive: am I doing something wrong?
In-Reply-To: <7xwrx3mxuj.fsf@ruckus.brouhaha.com>
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>	<mailman.963.1268958842.23598.python-list@python.org>	<ho6ai4$b12$2@lust.ihug.co.nz>	<mailman.1060.1269243742.23598.python-list@python.org>	<ho8v4q$a4q$2@news.eternal-september.org>	<mailman.1076.1269310331.23598.python-list@python.org>
	<7xwrx3mxuj.fsf@ruckus.brouhaha.com>
Message-ID: <hoa3pg$pr8$1@dough.gmane.org>

Paul Rubin, 23.03.2010 06:05:
> Antoine Pitrou writes:
>> "Orders of magnitude worse", in any case, sounds very exaggerated.
>
> The worst case can lose orders of magnitude if a lot of values hash
> to the same bucket.

While this is theoretically true, and it's good to be aware of this 
possibility, common string hash functions make it so rare in practice that 
a hash table will almost always outperform a trie for exact lookups. If it 
happens, it will either show up clearly enough in benchmarks or not be 
worth bothering.

Stefan



From python at hope.cz  Tue Mar 23 06:48:38 2010
From: python at hope.cz (Johny)
Date: Tue, 23 Mar 2010 03:48:38 -0700 (PDT)
Subject: How to find the best solution ?
Message-ID: <b5d9524e-cdc5-45e8-a412-8d340ebfc21c@o30g2000yqb.googlegroups.com>

I have a text and would like  to split the text into smaller parts,
say into 100 characters each. But if  the 100th character is not a
blank ( but word) this must be less than 100 character.That means the
word itself can not be split.
These smaller parts must contains only whole( not split) words.
I was thinking  about  RegEx but do not know how to find the correct
Regular Expression.
Can anyone help?
Thanks
L.


From mail at timgolden.me.uk  Tue Mar 23 06:54:33 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 23 Mar 2010 10:54:33 +0000
Subject: How to find the best solution ?
In-Reply-To: <b5d9524e-cdc5-45e8-a412-8d340ebfc21c@o30g2000yqb.googlegroups.com>
References: <b5d9524e-cdc5-45e8-a412-8d340ebfc21c@o30g2000yqb.googlegroups.com>
Message-ID: <4BA89DE9.5080001@timgolden.me.uk>

On 23/03/2010 10:48, Johny wrote:
> I have a text and would like  to split the text into smaller parts,
> say into 100 characters each. But if  the 100th character is not a
> blank ( but word) this must be less than 100 character.That means the
> word itself can not be split.
> These smaller parts must contains only whole( not split) words.
> I was thinking  about  RegEx but do not know how to find the correct
> Regular Expression.
> Can anyone help?
> Thanks
> L.

Have a look at the textwrap module

TJG


From alfps at start.no  Tue Mar 23 06:54:45 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Tue, 23 Mar 2010 11:54:45 +0100
Subject: Some silly code for Easter holiday
Message-ID: <hoa6lr$u6o$1@news.eternal-september.org>

This program simulates some colored balls moving around, changing color 
according to certain rules. I think the most interesting is perhaps to not look 
at this code but just try to run it and figure out the color changing rules from 
observing the effect (extra mystery: why I wrote this). Sort of like an Easter 
holiday mystery.


<code>
# Py3
# Copyright 2010 Alf P. Steinbach
import tkinter as tk
from collections import namedtuple
import random

Point           = namedtuple( "Point", "x, y" )
Size            = namedtuple( "Size", "x, y" )
RGB             = namedtuple( "RGB", "r, g, b" )

def generator( g ):
     assert isinstance( g, type( (i for i in ()) ) )
     return g

def tk_internal_bbox_from( bbox: tuple ):
     return ((bbox[0], bbox[1], bbox[2]+2, bbox[3]+2))

def tk_new_ellipse( canvas, bbox: tuple, **kwargs ):
     return canvas.create_oval( tk_internal_bbox_from( bbox ), **kwargs )

class TkTimer:
     def __init__( self, widget, msecs: int, action, start_running: bool = True ):
         self._widget = widget
         self._msecs = msecs
         self._action = action
         self._id = None
         if start_running: self.start()

     def start( self ):
         self._id = self._widget.after( self._msecs, self._on_timer )

     def stop( self ):
         id = self._id;
         self._id = None
         self._widget.after_cancel( id )     # Try to cancel last event.

     def _on_timer( self ):
         if self._id is not None:
             self._action()
             self.start()

class TkEllipse:
     def __init__( self, canvas, bbox: tuple, **kwargs ):
         self._canvas = canvas
         self._id = tk_new_ellipse( canvas, bbox, **kwargs )

     @property   # id
     def id( self ):     return self._id

     @property   # fill
     def fill( self ):
         return self._canvas.itemcget( self._id, "fill" )
     @fill.setter
     def fill( self, color_representation: str ):
         self._canvas.itemconfigure( self._id,
             fill = color_representation
             )

     @property   # internal_bbox
     def internal_bbox( self ):
         return tuple( self._canvas.coords( self._id ) )

     @property   # position
     def position( self ):
         bbox = self.internal_bbox
         return Point( bbox[0], bbox[1] )
     @position.setter
     def position( self, new_pos: Point ):
         bbox = self.internal_bbox
         (dx, dy) = (new_pos.x - bbox[0], new_pos.y - bbox[1])
         self._canvas.move( self._id, dx, dy )
         #assert self.position == new_pos

class Color:
     def __init__( self, rgb_or_name ):
         if isinstance( rgb_or_name, RGB ):
             name = None
             rgb = rgb_or_name
         else:
             assert isinstance( rgb_or_name, str )
             name = rgb_or_name
             rgb = None
         self._name = name
         self._rgb = rgb

     @property
     def representation( self ):
         if self._name is not None:
             return self._name
         else:
             rgb = self._rgb
             return "#{:02X}{:02X}{:02X}".format( rgb.r, rgb.g, rgb.b )

     def __str__( self ):    return self.representation
     def __hash__( self ):   return hash( self.representation )

class Rectangle:
     def __init__( self,
         width       : int,
         height      : int,
         upper_left  : Point = Point( 0, 0 )
         ):
         self._left = upper_left.x
         self._right = upper_left.x + width
         self._top = upper_left.y
         self._bottom = upper_left.y + height

     @property   # left
     def left( self ):       return self._left

     @property   # top
     def top( self ):        return self._top

     @property   # right
     def right( self ):      return self._right

     @property   # bottom
     def bottom( self ):     return self._bottom

     @property   # width
     def width( self ):      return self._right - self._left

     @property   # height
     def height( self ):     return self._bottom - self._top

     @property   # size
     def size( self ):       return Size( self.width, self.height )


class Ball:
     def __init__( self,
         color           : Color,
         position        : Point = Point( 0, 0 ),
         velocity        : Point = Point( 0, 0 )
         ):
         self.color      = color
         self.position   = position
         self.velocity   = velocity

     def squared_distance_to( self, other ):
         p1 = self.position
         p2 = other.position
         return (p2.x - p1.x)**2 + (p2.y - p1.y)**2

class BallSim:
     def __init__( self,
         rect                : Rectangle,
         n_balls             : int = 1
         ):
         def random_pos():
             return Point(
                 random.randrange( rect.left, rect.right ),
                 random.randrange( rect.top, rect.bottom )
                 )
         def random_velocity():
             return Point(
                 random.randint( -10, 10 ),
                 random.randint( -10, 10 )
                 )
         def balls( color ):
             return generator(
                 Ball( color, random_pos(), random_velocity() ) for i in range( 
n_balls )
                 )
         self._rect              = rect
         self._kind_1_color      = Color( "blue" )
         self._kind_2_color      = Color( "orange" )
         self._balls             = tuple( balls( self._kind_1_color ) )
         self._is_close_distance = 20;

     @property   # rect
     def rect( self ):       return self._rect

     @property   # interaction_radius
     def interaction_radius( self ):
         return self._is_close_distance

     @property   # n_balls
     def n_balls( self ):    return len( self._balls )

     def ball( self, i ):    return self._balls[i]
     def balls( self ):      return self._balls

     def _update_positions_and_velocities( self ):
         rect = self._rect
         for ball in self._balls:
             pos = ball.position;  v = ball.velocity;
             pos = Point( pos.x + v.x, pos.y + v.y )
             if pos.x < 0:
                 pos = Point( -pos.x, pos.y )
                 v = Point( -v.x, v.y )
             if pos.x >= rect.width:
                 pos = Point( 2*rect.width - pos.x, pos.y )
                 v = Point( -v.x, v.y )
             if pos.y < 0:
                 pos = Point( pos.x, -pos.y )
                 v = Point( v.x, -v.y )
             if pos.y >= rect.height:
                 pos = Point( pos.x, 2*rect.height - pos.y )
                 v = Point( v.x, -v.y )
             ball.position = pos
             ball.velocity = v

     def _balls_possibly_close_to( self, ball ):
         max_d_squared = self._is_close_distance**2
         result = []
         for other in self._balls:
             if other is ball:
                 continue
             if ball.squared_distance_to( other ) <= max_d_squared:
                 result.append( other )
         return result

     def _update_kinds( self ):
         max_d_squared = self._is_close_distance**2
         for ball in self._balls:
             if ball.color == self._kind_1_color:
                 for other_ball in self._balls_possibly_close_to( ball ):
                     if ball.squared_distance_to( other_ball ) <= max_d_squared:
                         if other_ball.color == self._kind_1_color:
                             ball.color = self._kind_2_color
                             other_ball.color = self._kind_2_color
                             break
             else:
                 if random.random() < 0.01:
                     ball.color = self._kind_1_color

     def evolve( self ):
         self._update_positions_and_velocities()
         self._update_kinds()

class View:
     def _create_widgets( self, parent_widget, sim: BallSim ):
         self.widget = tk.Frame( parent_widget )
         if True:
             canvas = tk.Canvas(
                 self.widget, bg = "white", width = sim.rect.width, height = 
sim.rect.height
                 )
             canvas.pack()
             self._canvas = canvas
             self._circles = []
             radius = sim.interaction_radius // 2
             self._ball_radius = radius
             for ball in sim.balls():
                 (x, y) = (ball.position.x, ball.position.y)
                 bbox = (x - radius, y - radius, x + radius, y + radius)
                 ellipse = TkEllipse( canvas, bbox, fill = 
ball.color.representation )
                 self._circles.append( ellipse )
         pass

     def __init__( self, parent_widget, sim: BallSim ):
         self._create_widgets( parent_widget, sim )
         self._sim = sim

     def update( self ):
         sim = self._sim
         r = self._ball_radius
         for (i, ball) in enumerate( sim.balls() ):
             center_pos = ball.position
             self._circles[i].position = Point( center_pos.x - r, center_pos.y - r )
             self._circles[i].fill = ball.color

class Controller:
     def __init__( self, main_window ):
         self._window = main_window

         self._model = BallSim( Rectangle( 600, 500 ), n_balls = 20 )

         self._view = view = View( main_window, self._model )
         view.widget.place( relx = 0.5, rely = 0.5, anchor="center" )
         self._timer = TkTimer( main_window, msecs = 42, action = self._on_timer )

     def _on_timer( self ):
         self._model.evolve()
         self._view.update()


def main():
     window = tk.Tk()
     window.title( "Sim 1 -- Chameleon Balls" )
     window.geometry( "640x510" )

     controller = Controller( window )
     window.mainloop()

main()
</code>


Cheers,

- Alf


From jeanmichel at sequans.com  Tue Mar 23 06:55:16 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Tue, 23 Mar 2010 11:55:16 +0100
Subject: short-circuiting any/all ?
In-Reply-To: <ho98sc$abv$1@reader1.panix.com>
References: <ho7vq2$1s5$1@reader1.panix.com>	<291d82b7-b13b-4f49-901c-8194f3e07598@e7g2000yqf.googlegroups.com>	<ho8d0a$261$1@reader1.panix.com>	<mailman.1069.1269283393.23598.python-list@python.org>	<ho8qed$ap0$1@reader1.panix.com>	<pan.2010.03.23.01.30.37@REMOVE.THIS.cybersource.com.au>
	<ho98sc$abv$1@reader1.panix.com>
Message-ID: <4BA89E14.3050507@sequans.com>

kj wrote:
> Arguably, Knuth's "premature optimization is the root of all evil"
> applies even to readability (e.g. "what's the point of making code
> optimally readable if one is going to change it completely next
> day?") 
The guy who will change it will have to read it. The only waste would be 
if the code would never be read again.
>  If there were the equivalent of a profiler for code clutter,
> I guess I could relax my readability standards a bit...
>
> ~K
>   
Don't relax, just keep up :o)

JM


From alexandre.fayolle at logilab.fr  Tue Mar 23 07:48:44 2010
From: alexandre.fayolle at logilab.fr (Alexandre Fayolle)
Date: Tue, 23 Mar 2010 12:48:44 +0100
Subject: ANN: Pylint bug day, 2nd edition
In-Reply-To: <201003221838.07672.alexandre.fayolle@logilab.fr>
References: <201003221838.07672.alexandre.fayolle@logilab.fr>
Message-ID: <201003231248.44408.alexandre.fayolle@logilab.fr>

On Monday 22 March 2010 18:38:07 Alexandre Fayolle wrote:
> .. _pylint bugs day: https://www.logilab.net/elo/blogentry/18781

Correct link is : http://www.logilab.org/blogentry/18781

Sorry for the inconvenience. 

-- 
Alexandre Fayolle                              LOGILAB, Paris (France)
Formations Python, CubicWeb, Debian :  http://www.logilab.fr/formations
D?veloppement logiciel sur mesure :      http://www.logilab.fr/services
Informatique scientifique:               http://www.logilab.fr/science


From phil at freehackers.org  Tue Mar 23 08:38:37 2010
From: phil at freehackers.org (BlueBird)
Date: Tue, 23 Mar 2010 05:38:37 -0700 (PDT)
Subject: SOAP 1.2 Python client ?
References: <5a36bd30-6cbd-48ca-9ca3-dc34c97e03c0@o30g2000yqb.googlegroups.com>
	<mailman.227.1267644925.23598.python-list@python.org>
	<fcaa9201-5e94-4cf3-af6e-78c1bbcb6144@t20g2000yqe.googlegroups.com>
	<13753751-d0af-48df-b78d-5b371109e05c@t41g2000yqt.googlegroups.com>
Message-ID: <e4620dbf-b8c6-414e-8e0a-b51640def9a5@o30g2000yqb.googlegroups.com>

On 5 mar, 13:19, lbolla <lbo... at gmail.com> wrote:
> On Mar 5, 10:01?am, BlueBird <p... at freehackers.org> wrote:
>
>
>
>
>
> > On 3 mar, 20:35, Stefan Behnel <stefan... at behnel.de> wrote:
>
> > > BlueBird, 03.03.2010 17:32:
>
> > > > I am looking for aSOAP1.2 python client. To my surprise, it seems
> > > > that this does not exist. Does anybody know about this ?
>
> > >SOAPmay be an overly bloated protocol, but it's certainly not black magic.
> > > It's not hard to do manually if you really need to:
>
> > >http://effbot.org/zone/element-soap.htm
>
> > But this requires a goog knowloedge ofSOAP, in order to parse
> > everything correctly. The reason I want to use a ready-made client is
> > that I have about zero knowledge aboutSOAP, and even more in the
> > differences betweenSOAP1.1 and 1.2 .
>
> > cheers,
>
> > Philippe
>
> I use a thin custom-made python wrapper around gSoap[1], which is tens
> of times faster than ZSI.

I looked at gSoap and the solution seemed really nice. They can
generate C that I can call with ctypes.

The only problem is that I am working on a closed source software and
their licensing cost for close source were too expensive for my
company.

After much much digging, we found out the problem and managed to solve
it with SUDS. When calling a .NET service, you should not reference
the soap envelope spec with 'http://schemas.xmlsoap.org/soap/
envelope/' but with 'http://schemas.xmlsoap.org/soap/envelope' .
The .NET server implementation seems to be very picky about the
last / .

Yeah for SUDS and oooooh for .NET

cheers,

Philippe



From saimapk81 at gmail.com  Tue Mar 23 08:54:01 2010
From: saimapk81 at gmail.com (saima81)
Date: Tue, 23 Mar 2010 05:54:01 -0700 (PDT)
Subject: "jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
	citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
	manager" 
	"usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
Message-ID: <3214acd7-f057-4444-9ff8-d6402d7a4b30@u5g2000prd.googlegroups.com>

"jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
manager" "usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
"jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
manager" "usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
"jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
manager" "usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
"jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
manager" "usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
"jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
manager" "usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
"jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
manager" "usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
"jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
manager" "usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
"jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
manager" "usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
"jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
manager" "usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
"jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
manager" "usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
"jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
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From vlastimil.brom at gmail.com  Tue Mar 23 10:18:17 2010
From: vlastimil.brom at gmail.com (Vlastimil Brom)
Date: Tue, 23 Mar 2010 15:18:17 +0100
Subject: individually updating unicodedata db?
In-Reply-To: <op.u90eslyux6zn5v@lepton.softlabbsas.com.ar>
References: <9fdb569a1003221719k50345867vfc4a47683e877aae@mail.gmail.com>
	<op.u90eslyux6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <9fdb569a1003230718u37d2e2dem944e4141def631b0@mail.gmail.com>

2010/3/23 Gabriel Genellina <gagsl-py2 at yahoo.com.ar>:
> En Mon, 22 Mar 2010 21:19:04 -0300, Vlastimil Brom
> <vlastimil.brom at gmail.com> escribi?:
>
>> I guess, I am stuck here, as I use the precompiled version supplied in
>> the windows installer and can't compile python from source to obtain
>> the needed unicodedata.pyd.
>
> You can recompile Python from source, on Windows, using the free Microsoft?
> Visual C++? 2008 Express Edition.
> http://www.microsoft.com/express/Windows/
>
> Fetch the required dependencies using Tools\buildbot\external.bat, and then
> execute PCbuild\env.bat and build.bat. See readme.txt in that directory for
> details. It should build cleanly.
>
> --
> Gabriel Genellina
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Thanks for the hints; i probably screwed some steps up in some way,
but the result seem to be working for the most part; I'll try to
summarise it just for the record (also hoping to get further
suggestions):
I used the official source tarball for python 2.6.5 from:
http://www.python.org/download/

In the unpacked sources, I edited the file:
...\Python-2.6.5-src\Tools\unicode\makeunicodedata.py

import re # added
...
# UNIDATA_VERSION = "5.1.0" # changed to:
UNIDATA_VERSION = "5.2.0"

Furthermore the following text files were copied to the same directory
like makeunicodedata.py

CompositionExclusions-3.2.0.txt
EastAsianWidth-3.2.0.txt
UnicodeData-3.2.0.txt
UnicodeData.txt
EastAsianWidth.txt
CompositionExclusions.txt

from
http://unicode.org/Public/3.2-Update/
and
http://unicode.org/Public/5.2.0/ucd/

furthermore there are some files in the subdirectories needed:
...\Python-2.6.5-src\Tools\unicode\Objects\unicodetype_db.h
...\Python-2.6.5-src\Tools\unicode\Modules\unicodedata_db.h
...\Python-2.6.5-src\Tools\unicode\Modules\unicodename_db.h

After running makeunicodedata.py, the above headers are recreated from
the new unicode database and can be copied to the original locations
in the source

...\Python-2.6.5-src\Objects\unicodetype_db.h
...\Python-2.6.5-src\Modules\unicodedata_db.h
...\Python-2.6.5-src\Modules\unicodename_db.h

(while keeping the backups)

Trying to run
...\Python-2.6.5-src\Tools\buildbot\external.bat and other bat files,
I got quite a few path mismatches resulting in file ... not found
errors;

However, I was able to just open the solution file in Visual C++ 2008 Express:
C:\install\Python-2.6.5-src\PCbuild\pcbuild.sln
set the build configuration to "release" and try to build the sources.

There were some errors in particular modules (which might be due to my
mistakes or ommissions, as this maybe shouldn't happen normally), but
the wanted
...\Python-2.6.5-src\PCbuild\unicodedata.pyd
was generated and can be used in the original python installation:
C:\Python26\DLLs\unicodedata.pyd

the newly added characters, cf.:
http://www.unicode.org/Public/UNIDATA/DerivedAge.txt
seem to be available

 ? (dec.: 8528)  (hex.: 0x2150) # ? VULGAR FRACTION ONE SEVENTH (Number, Other)
 ? (dec.: 68352)  (hex.: 0x10b00) # ? AVESTAN LETTER A (Letter, Other)

but some are not present; I noticed this for
the new CJK block - CJK Unified Ideographs Extension C (U+2A700..U+2B73F).
Probably this new range isn't taken into account for some reason.

All in all, I am happy to have the current version of the unicode
database available; I somehow expected this to be more complicated,
but on the other hand I can't believe this is the standard way of
preparing the built versions (with all the copying,checking and and
replacing the files); it might be possible, that the actual
distribution is built using some different tools (the trivial missing
import in makeunicodedata.py would be found immediately, I guess).

I also wanted to ask, whether the missing characters might be a result
of my error in updating the unicode database, or could it be a problem
with the makeunicodedata.py itself?

Thanks in advance and sorry for this long post.
    vbr


From peter at psantoro.net  Tue Mar 23 10:38:20 2010
From: peter at psantoro.net (peter at psantoro.net)
Date: 23 Mar 2010 07:38:20 -0700
Subject: RELEASED Python 2.6.5
References: <mailman.990.1269039418.23598.python-list@python.org>
Message-ID: <hoajos028di@drn.newsguy.com>

Thank you everyone for all the work that went into this update, but there may be
a small problem with the Windows x86 installer.

I've built and used python 2.6.5 on linux without any apparent problems, but the
Windows x86 binary installer stops after compiling a few python source files.

I've tried the Windows x86 installer on two differently configured Windows XP
PCs (SP3 with patches), but I get the following errors during the advanced
compiling of python source files:

"There is a problem with this Windows Installer package.  A program run as part
of the setup did not finish as expected.  Contact your support personnel or
package vendor."

"Python 2.6.5 Installer ended prematurely ..."

The md5sum of the Windows x86 installer matched the published value.  I did not
try not using the advanced option.  I reinstalled python 2.6.4 on both of the
PCs without any problems and used the advanced compile option.

Is anyone else having trouble with the 2.6.5 Windows x86 installer?

Peter



From omrihsan at gmail.com  Tue Mar 23 10:49:08 2010
From: omrihsan at gmail.com (Omer Ihsan)
Date: Tue, 23 Mar 2010 07:49:08 -0700 (PDT)
Subject: device identification
References: <9c7ed2c8-f04b-4302-a4be-bde1628ef966@y11g2000prf.googlegroups.com>
	<46ggq59e49qpna7f9ae6q8ftobhot351un@4ax.com>
Message-ID: <57c86289-85e7-4c9f-b7ed-787687d9a5b6@x23g2000prd.googlegroups.com>

On Mar 23, 9:22?am, Tim Roberts <t... at probo.com> wrote:
> Omer Ihsan <omrih... at gmail.com> wrote:
>
> >i have installed pyusb now and run the sample usbenum.py....i have 3
> >usb ports on my PC but the results show 6 outputs to
> >dev.filename..they are numbers like 001 or 005 etc.... and they
> >changed when i plugged in devices...(i am no good with the usb
> >standards)....i just want to identify each device/port... what
> >parameter in the example would help me....
>
> You can't identify the ports.[1] ?What good would it do you? ?The ports on
> your PC are not numbered.
>
> You certainly CAN identify the devices, by their VID and PID (or idVendor
> and idProduct). ?You identify by function, not by location. ?When you plug
> in a USB drive, you don't want to worry about where it's plugged in.
> ===
> [1]: OK, technically, it is not impossible to identify the port numbers,
> but it is quite tedious. ?You need to chase through the sysfs expansion of
> your buses hub/port tree and find a match for your device. ?It's not worth
> the trouble.
> --
> Tim Roberts, t... at probo.com
> Providenza & Boekelheide, Inc.

VID and PID is fair enough. now what i want is that i have a threaded
code that threads two functions to run at the same time. i want each
function to run seperate devices. the problem is if it doesnt identify
the attached devices it might run the code on a single device which
isnt what is required.
how will i be able to run a code on a device of my choice???....you
can leave away the threading part for now.


From alley at dragoncreativeworks.net  Tue Mar 23 12:04:21 2010
From: alley at dragoncreativeworks.net (Allan Davis)
Date: Tue, 23 Mar 2010 11:04:21 -0500
Subject: RELEASED Python 2.6.5
In-Reply-To: <hoajos028di@drn.newsguy.com>
References: <mailman.990.1269039418.23598.python-list@python.org>
	<hoajos028di@drn.newsguy.com>
Message-ID: <61c507641003230904w41a028dbl21e83fc4399dc6cf@mail.gmail.com>

I just downloaded the installer and tested it on my win xp machine.  The
installer worked fine.


--------------------------------------------------------------
Allan Davis
Member of NetBeans Dream Team
http://wiki.netbeans.org/NetBeansDreamTeam
Lead Developer, nbPython
http://wiki.netbeans.org/Python
http://codesnakes.blogspot.com (my blog)
Co-Chair, CajunJUG
http://www.cajunjug.org


On Tue, Mar 23, 2010 at 9:38 AM, <peter at psantoro.net> wrote:

> Thank you everyone for all the work that went into this update, but there
> may be
> a small problem with the Windows x86 installer.
>
> I've built and used python 2.6.5 on linux without any apparent problems,
> but the
> Windows x86 binary installer stops after compiling a few python source
> files.
>
> I've tried the Windows x86 installer on two differently configured Windows
> XP
> PCs (SP3 with patches), but I get the following errors during the advanced
> compiling of python source files:
>
> "There is a problem with this Windows Installer package.  A program run as
> part
> of the setup did not finish as expected.  Contact your support personnel or
> package vendor."
>
> "Python 2.6.5 Installer ended prematurely ..."
>
> The md5sum of the Windows x86 installer matched the published value.  I did
> not
> try not using the advanced option.  I reinstalled python 2.6.4 on both of
> the
> PCs without any problems and used the advanced compile option.
>
> Is anyone else having trouble with the 2.6.5 Windows x86 installer?
>
> Peter
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From rosymonijasmine at gmail.com  Tue Mar 23 12:05:42 2010
From: rosymonijasmine at gmail.com (Jasmine Rose)
Date: Tue, 23 Mar 2010 09:05:42 -0700 (PDT)
Subject: Stop the Heat from Sun Rays!
Message-ID: <37e5dd24-c8a4-494f-8cf1-1577cf247401@u15g2000prd.googlegroups.com>

Stop the Heat! Stop UV Damage! Save Money! - More Details :
http://www.suntechglasstinting.com/welcome.php


From solipsis at pitrou.net  Tue Mar 23 12:53:34 2010
From: solipsis at pitrou.net (Antoine Pitrou)
Date: Tue, 23 Mar 2010 16:53:34 +0000 (UTC)
Subject: GC is very expensive: am I doing something wrong?
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
	<mailman.963.1268958842.23598.python-list@python.org>
	<ho6ai4$b12$2@lust.ihug.co.nz>
	<mailman.1060.1269243742.23598.python-list@python.org>
	<ho8v4q$a4q$2@news.eternal-september.org>
	<mailman.1076.1269310331.23598.python-list@python.org>
	<7xwrx3mxuj.fsf@ruckus.brouhaha.com>
	<mailman.1083.1269338807.23598.python-list@python.org>
	<7xpr2v2wd7.fsf@ruckus.brouhaha.com>
Message-ID: <hoarme$kpt$1@dough.gmane.org>

Le Tue, 23 Mar 2010 02:57:56 -0700, Paul Rubin a ?crit?:
> 
> It is unlikely to happen by accident.  You might care that it can happen
> on purpose.  See: http://www.cs.rice.edu/~scrosby/hash/ that I cited in
> another post.  The article shows some sample attacks on Python cgi's.

Certainly interesting in a purely academic point of view, but in real 
life if you want to cause a denial of service by overwhelming a server, 
there are far more obvious options than trying to guess the server's use 
of hash tables and trying to cause lots of collisions in them.



From jfernand57 at gmail.com  Tue Mar 23 12:55:30 2010
From: jfernand57 at gmail.com (Jose Manuel)
Date: Tue, 23 Mar 2010 09:55:30 -0700 (PDT)
Subject: Python is cool!!
Message-ID: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>

I have been learning Python, and it is amazing .... I am using the
tutorial that comes with the official distribution.

At the end my goal is to develop applied mathematic in engineering
applications to be published on the Web, specially on app. oriented to
simulations and control systems, I was about to start learning Java
but I found Python which seems easier to learn that Java.

Would it be easy to integrate Python in Web pages with HTML? I have
read many info on Internet saying it is, and I hope so ....

Any opinion


From mehgcap at gmail.com  Tue Mar 23 13:01:21 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Tue, 23 Mar 2010 13:01:21 -0400
Subject: using message loop for hotkey capturing
Message-ID: <bc7f680c1003231001rfeb6f33ve4d04d36d32e737a@mail.gmail.com>

Hi all, but mainly Tim Golden:
Tim, I am using your wonderful message loop for keyboard input, the
one on your site that you pointed me to a few months ago. It has been
working perfectly as long as I had only one dictionary of keys mapping
to one dictionary of functions, but now I want two of each. My program
has different modes, which may have varying keystrokes, and I also
have some global keystrokes which are the same across all modes, like
exiting or switching modes. I cannot figure out how to make the
message loop look in two dictionaries at onc. I tried using an if,
saying that if action_to_take was not set in the mode-specific
dictionary then look at the global dictionary, but it is like it is
never looking in the global dictionary at all. I get no syntax errors
or problems when running the program, so it has to be something in my
logic. Go to
http://www.gateway2somewhere.com/sw/main.pyw
to see what I mean; the problem code is near the very bottom of the
file. Thanks for any suggestions. Oh, please note that I indent one
space per indentation level.

-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From vinay_sajip at yahoo.co.uk  Tue Mar 23 13:06:43 2010
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Tue, 23 Mar 2010 10:06:43 -0700 (PDT)
Subject: Castrated traceback in sys.exc_info()
References: mailman.1078.1269324766.23598.python-list@python.org
Message-ID: <54e357f4-705f-40a8-ac6c-e5ae84f814f7@t23g2000yqt.googlegroups.com>

On Mar 23, 6:12?am, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
wrote:
> En Mon, 22 Mar 2010 15:20:39 -0300, Pascal Chambon ?
> <chambon.pas... at wanadoo.fr> escribi???:
>
>
>
>
>
> > Allright, here is more concretely the problem :
>
> > ERROR:root:An error
> > Traceback (most recent call last):
> > ? File "C:/Users/Pakal/Desktop/aaa.py", line 7, in c
> > ? ? return d()
> > ? File "C:/Users/Pakal/Desktop/aaa.py", line 11, in d
> > ? ? def d(): raise ValueError
> > ValueError
>
> > As you see, the traceback only starts from function c, which handles the ?
> > exception.
> > It doesn't show main(), a() and b(), which might however be (and are, in ?
> > my case) critical to diagnose the severity of the problem (since many ?
> > different paths would lead to calling c()).
>
> > So the question is : is that possible to enforce, by a way or another, ?
> > the retrieval of the FULL traceback at exception raising point, instead ?
> > of that incomplete one ?
>
> Thanks for bringing this topic! I learned a lot trying to understand what ?
> happens.
>
> The exception traceback (what sys.exc_info()[2] returns) is *not* a ?
> complete stack trace. The sys module documentation is wrong [1] when it ?
> says "...encapsulates the call stack at the point where the exception ?
> originally occurred."
>
> The Language Reference is more clear [2]: "Traceback objects represent a ?
> stack trace of an exception. A traceback object is created when an ?
> exception occurs. When the search for an exception handler unwinds the ?
> execution stack, at each unwound level a traceback object is inserted in ?
> front of the current traceback. When an exception handler is entered, the ?
> stack trace is made available to the program."
>
> That is, a traceback holds only the *forward* part of the stack: the ?
> frames already exited when looking for an exception handler. Frames going ?
> ?from the program starting point up to the current execution point are ?
> *not* included.
>
> Conceptually, it's like having two lists: stack and traceback. The ?
> complete stack trace is always stack+traceback. At each step (when ?
> unwinding the stack, looking for a frame able to handle the current ?
> exception) an item is popped from the top of the stack (last item) and ?
> inserted at the head of the traceback.
>
> The traceback holds the "forward" path (from the current execution point, ?
> to the frame where the exception was actually raised). It's a linked list, ?
> its tb_next attribute holds a reference to the next item; None marks the ?
> last one.
>
> The "back" path (going from the current execution point to its caller and ?
> all the way to the program entry point) is a linked list of frames; the ?
> f_back attribute points to the previous one, or None.
>
> In order to show a complete stack trace, one should combine both. The ?
> traceback module contains several useful functions: extract_stack() + ?
> extract_tb() are a starting point. The simplest way I could find to make ?
> theloggingmodule report a complete stack is to monkey patch ?logging.Formatter.formatException so it uses format_exception() and ?
> format_stack() combined (in fact it is simpler than the current ?
> implementation using a StringIO object):
>
> <code>
> importlogging
> import traceback
>
> def formatException(self, ei):
> ? ? ?"""
> ? ? ?Format and return the specified exception information as a string.
>
> ? ? ?This implementation builds the complete stack trace, combining
> ? ? ?traceback.format_exception and traceback.format_stack.
> ? ? ?"""
> ? ? ?lines = traceback.format_exception(*ei)
> ? ? ?if ei[2]:
> ? ? ? ? ?lines[1:1] = traceback.format_stack(ei[2].tb_frame.f_back)
> ? ? ?return ''.join(lines)
>
> # monkey patch theloggingmodulelogging.Formatter.formatException = formatException
>
> def a(): return b()
> def b(): return c()
> def c():
> ? ? ?try:
> ? ? ? ?return d()
> ? ? ?except:
> ? ? ? ?logging.exception("An error")
> ? ? ? ?raise
> def d(): raise ValueError
>
> def main():
> ? ?a()
>
> main()
> </code>
>
> Output:
>
> ERROR:root:An error
> Traceback (most recent call last):
> ? ?File "test_logging.py", line 32, in <module>
> ? ? ?main()
> ? ?File "test_logging.py", line 30, in main
> ? ? ?a()
> ? ?File "test_logging.py", line 19, in a
> ? ? ?def a(): return b()
> ? ?File "test_logging.py", line 20, in b
> ? ? ?def b(): return c()
> ? ?File "test_logging.py", line 23, in c
> ? ? ?return d()
> ? ?File "test_logging.py", line 27, in d
> ? ? ?def d(): raise ValueError
> ValueError
>
> Traceback (most recent call last):
> ? ?File "test_logging.py", line 32, in <module>
> ? ? ?main()
> ? ?File "test_logging.py", line 30, in main
> ? ? ?a()
> ? ?File "test_logging.py", line 19, in a
> ? ? ?def a(): return b()
> ? ?File "test_logging.py", line 20, in b
> ? ? ?def b(): return c()
> ? ?File "test_logging.py", line 23, in c
> ? ? ?return d()
> ? ?File "test_logging.py", line 27, in d
> ? ? ?def d(): raise ValueError
> ValueError
>
> Note that both tracebacks are identical: the first comes from the patched ?loggingmodule, the second is the standard Python one.
>
> [1]http://docs.python.org/library/sys.html#sys.exc_info
> [2] ?http://docs.python.org/reference/datamodel.html#the-standard-type-hie...
>
> --
> Gabriel Genellina

Good catch, Gabriel.

There should be no need to monkey-patch the logging module - it's
better if I include the change in the module itself. The only
remaining question is that of backward compatibility, but I can do
this for Python 2.7/3.2 only so that won't be an issue. It's probably
a good idea to log an issue on the bug tracker, though, so we have
some history for the change - do you want to do that, or shall I?

Regards,

Vinay Sajip


From mail at timgolden.me.uk  Tue Mar 23 13:07:57 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 23 Mar 2010 17:07:57 +0000
Subject: Python is cool!!
In-Reply-To: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
References: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
Message-ID: <4BA8F56D.6060305@timgolden.me.uk>

On 23/03/2010 16:55, Jose Manuel wrote:
> I have been learning Python, and it is amazing .... I am using the
> tutorial that comes with the official distribution.
>
> At the end my goal is to develop applied mathematic in engineering
> applications to be published on the Web, specially on app. oriented to
> simulations and control systems, I was about to start learning Java
> but I found Python which seems easier to learn that Java.
>
> Would it be easy to integrate Python in Web pages with HTML? I have
> read many info on Internet saying it is, and I hope so ....

You probably want to be looking at IronPython and Silverlight.
In fact, the prolific Michael Foord has already produced an
example of this, which gives you the Python tutorial online!

   http://trypython.org

TJG


From mail at timgolden.me.uk  Tue Mar 23 13:09:36 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 23 Mar 2010 17:09:36 +0000
Subject: using message loop for hotkey capturing
In-Reply-To: <bc7f680c1003231001rfeb6f33ve4d04d36d32e737a@mail.gmail.com>
References: <bc7f680c1003231001rfeb6f33ve4d04d36d32e737a@mail.gmail.com>
Message-ID: <4BA8F5D0.7080502@timgolden.me.uk>

On 23/03/2010 17:01, Alex Hall wrote:
> Hi all, but mainly Tim Golden:
> Tim, I am using your wonderful message loop for keyboard input, the
> one on your site that you pointed me to a few months ago. It has been
> working perfectly as long as I had only one dictionary of keys mapping
> to one dictionary of functions, but now I want two of each. My program
> has different modes, which may have varying keystrokes, and I also
> have some global keystrokes which are the same across all modes, like
> exiting or switching modes. I cannot figure out how to make the
> message loop look in two dictionaries at onc. I tried using an if,
> saying that if action_to_take was not set in the mode-specific
> dictionary then look at the global dictionary, but it is like it is
> never looking in the global dictionary at all. I get no syntax errors
> or problems when running the program, so it has to be something in my
> logic. Go to
> http://www.gateway2somewhere.com/sw/main.pyw


Happy to look, Alex, but that link's giving me a 404 at the moment

TJG


From mehgcap at gmail.com  Tue Mar 23 13:29:05 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Tue, 23 Mar 2010 13:29:05 -0400
Subject: using message loop for hotkey capturing
In-Reply-To: <4BA8F5D0.7080502@timgolden.me.uk>
References: <bc7f680c1003231001rfeb6f33ve4d04d36d32e737a@mail.gmail.com>
	<4BA8F5D0.7080502@timgolden.me.uk>
Message-ID: <bc7f680c1003231029m7990dfafqbd7eddc28a358891@mail.gmail.com>

Sorry about that, it is fixed now.

On 3/23/10, Tim Golden <mail at timgolden.me.uk> wrote:
> On 23/03/2010 17:01, Alex Hall wrote:
>> Hi all, but mainly Tim Golden:
>> Tim, I am using your wonderful message loop for keyboard input, the
>> one on your site that you pointed me to a few months ago. It has been
>> working perfectly as long as I had only one dictionary of keys mapping
>> to one dictionary of functions, but now I want two of each. My program
>> has different modes, which may have varying keystrokes, and I also
>> have some global keystrokes which are the same across all modes, like
>> exiting or switching modes. I cannot figure out how to make the
>> message loop look in two dictionaries at onc. I tried using an if,
>> saying that if action_to_take was not set in the mode-specific
>> dictionary then look at the global dictionary, but it is like it is
>> never looking in the global dictionary at all. I get no syntax errors
>> or problems when running the program, so it has to be something in my
>> logic. Go to
>> http://www.gateway2somewhere.com/sw/main.pyw
>
>
> Happy to look, Alex, but that link's giving me a 404 at the moment
>
> TJG
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From python.list at tim.thechases.com  Tue Mar 23 13:31:09 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 23 Mar 2010 12:31:09 -0500
Subject: How to find the best solution ?
In-Reply-To: <b5d9524e-cdc5-45e8-a412-8d340ebfc21c@o30g2000yqb.googlegroups.com>
References: <b5d9524e-cdc5-45e8-a412-8d340ebfc21c@o30g2000yqb.googlegroups.com>
Message-ID: <4BA8FADD.5070709@tim.thechases.com>

Johny wrote:
> I have a text and would like  to split the text into smaller parts,
> say into 100 characters each. But if  the 100th character is not a
> blank ( but word) this must be less than 100 character.That means the
> word itself can not be split.
> These smaller parts must contains only whole( not split) words.
> I was thinking  about  RegEx but do not know how to find the correct
> Regular Expression.

While I suspect you can come close with a regular expression:

   import re, random
   size = 100
   r = re.compile(r'.{1,%i}\b' % size)
   # generate a random text string with a mix of word-lengths
   words = ['a', 'an', 'the', 'four', 'fives', 'sixsix']
   data = ' '.join(random.choice(words) for _ in range(200))
   # for each chunk of 100 characters (or fewer
   # if on a word-boundary), do something
   for bit in r.finditer(data):
     chunk = bit.group(0)
     print "%i: [%s]" % (len(chunk), chunk)

it may have an EOF fencepost error, so you might have to clean up 
the last item.  My simple test seemed to show it worked without 
cleanup though.

-tkc





From pruebauno at latinmail.com  Tue Mar 23 13:33:33 2010
From: pruebauno at latinmail.com (nn)
Date: Tue, 23 Mar 2010 10:33:33 -0700 (PDT)
Subject: Unicode blues in Python3
Message-ID: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>

I know that unicode is the way to go in Python 3.1, but it is getting
in my way right now in my Unix scripts. How do I write a chr(253) to a
file?

#nntst2.py
import sys,codecs
mychar=chr(253)
print(sys.stdout.encoding)
print(mychar)

 > ./nntst2.py
ISO8859-1
?

 > ./nntst2.py >nnout2
Traceback (most recent call last):
  File "./nntst2.py", line 5, in <module>
    print(mychar)
UnicodeEncodeError: 'ascii' codec can't encode character '\xfd' in
position 0: ordinal not in range(128)

> cat nnout2
ascii

..Oh great!

ok lets try this:
#nntst3.py
import sys,codecs
mychar=chr(253)
print(sys.stdout.encoding)
print(mychar.encode('latin1'))

> ./nntst3.py
ISO8859-1
b'\xfd'

> ./nntst3.py >nnout3

> cat nnout3
ascii
b'\xfd'

..Eh... not what I want really.

#nntst4.py
import sys,codecs
mychar=chr(253)
print(sys.stdout.encoding)
sys.stdout=codecs.getwriter("latin1")(sys.stdout)
print(mychar)

 > ./nntst4.py
ISO8859-1
Traceback (most recent call last):
  File "./nntst4.py", line 6, in <module>
    print(mychar)
  File "Python-3.1.2/Lib/codecs.py", line 356, in write
    self.stream.write(data)
TypeError: must be str, not bytes

..OK, this is not working either.

Is there any way to write a value 253 to standard output?


From python at mrabarnett.plus.com  Tue Mar 23 13:54:58 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 23 Mar 2010 17:54:58 +0000
Subject: using message loop for hotkey capturing
In-Reply-To: <bc7f680c1003231001rfeb6f33ve4d04d36d32e737a@mail.gmail.com>
References: <bc7f680c1003231001rfeb6f33ve4d04d36d32e737a@mail.gmail.com>
Message-ID: <4BA90072.9060305@mrabarnett.plus.com>

Alex Hall wrote:
> Hi all, but mainly Tim Golden:
> Tim, I am using your wonderful message loop for keyboard input, the
> one on your site that you pointed me to a few months ago. It has been
> working perfectly as long as I had only one dictionary of keys mapping
> to one dictionary of functions, but now I want two of each. My program
> has different modes, which may have varying keystrokes, and I also
> have some global keystrokes which are the same across all modes, like
> exiting or switching modes. I cannot figure out how to make the
> message loop look in two dictionaries at onc. I tried using an if,
> saying that if action_to_take was not set in the mode-specific
> dictionary then look at the global dictionary, but it is like it is
> never looking in the global dictionary at all. I get no syntax errors
> or problems when running the program, so it has to be something in my
> logic. Go to
> http://www.gateway2somewhere.com/sw/main.pyw
> to see what I mean; the problem code is near the very bottom of the
> file. Thanks for any suggestions. Oh, please note that I indent one
> space per indentation level.
> 
"msg.wParam" gives an int, but the keys of globalFuncs are 'g1', etc,
not ints.

Incidentally, you might want to change:

     if(not action_to_take):

to:

     if action_to_take is None:

in case any of the values happen to be 0 (if not now, then possibly at
some time in the future).


From rami.chowdhury at gmail.com  Tue Mar 23 14:00:09 2010
From: rami.chowdhury at gmail.com (Rami Chowdhury)
Date: Tue, 23 Mar 2010 11:00:09 -0700
Subject: Unicode blues in Python3
In-Reply-To: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
Message-ID: <201003231100.10103.rami.chowdhury@gmail.com>

On Tuesday 23 March 2010 10:33:33 nn wrote:
> I know that unicode is the way to go in Python 3.1, but it is getting
> in my way right now in my Unix scripts. How do I write a chr(253) to a
> file?
>
> #nntst2.py
> import sys,codecs
> mychar=chr(253)
> print(sys.stdout.encoding)
> print(mychar)

The following code works for me:

$ cat nnout5.py 
#!/usr/bin/python3.1

import sys
mychar = chr(253)
sys.stdout.write(mychar)
$ echo $(cat nnout)
?

Can I ask why you're using print() in the first place, rather than writing 
directly to a file? Python 3.x, AFAIK, distinguishes between text and binary 
files and will let you specify the encoding you want for strings you write.

Hope that helps,
Rami
> 
>  > ./nntst2.py
> 
> ISO8859-1
> ?
> 
>  > ./nntst2.py >nnout2
> 
> Traceback (most recent call last):
>   File "./nntst2.py", line 5, in <module>
>     print(mychar)
> UnicodeEncodeError: 'ascii' codec can't encode character '\xfd' in
> position 0: ordinal not in range(128)
> 
> > cat nnout2
> 
> ascii
> 
> ..Oh great!
> 
> ok lets try this:
> #nntst3.py
> import sys,codecs
> mychar=chr(253)
> print(sys.stdout.encoding)
> print(mychar.encode('latin1'))
> 
> > ./nntst3.py
> 
> ISO8859-1
> b'\xfd'
> 
> > ./nntst3.py >nnout3
> > 
> > cat nnout3
> 
> ascii
> b'\xfd'
> 
> ..Eh... not what I want really.
> 
> #nntst4.py
> import sys,codecs
> mychar=chr(253)
> print(sys.stdout.encoding)
> sys.stdout=codecs.getwriter("latin1")(sys.stdout)
> print(mychar)
> 
>  > ./nntst4.py
> 
> ISO8859-1
> Traceback (most recent call last):
>   File "./nntst4.py", line 6, in <module>
>     print(mychar)
>   File "Python-3.1.2/Lib/codecs.py", line 356, in write
>     self.stream.write(data)
> TypeError: must be str, not bytes
> 
> ..OK, this is not working either.
> 
> Is there any way to write a value 253 to standard output?

----
Rami Chowdhury
"Ninety percent of everything is crap." -- Sturgeon's Law
408-597-7068 (US) / 07875-841-046 (UK) / 01819-245544 (BD)


From mehgcap at gmail.com  Tue Mar 23 14:04:15 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Tue, 23 Mar 2010 14:04:15 -0400
Subject: using message loop for hotkey capturing
In-Reply-To: <4BA90072.9060305@mrabarnett.plus.com>
References: <bc7f680c1003231001rfeb6f33ve4d04d36d32e737a@mail.gmail.com>
	<4BA90072.9060305@mrabarnett.plus.com>
Message-ID: <bc7f680c1003231104i32879481ga3b3b2b16cec373b@mail.gmail.com>

On 3/23/10, MRAB <python at mrabarnett.plus.com> wrote:
> Alex Hall wrote:
>> Hi all, but mainly Tim Golden:
>> Tim, I am using your wonderful message loop for keyboard input, the
>> one on your site that you pointed me to a few months ago. It has been
>> working perfectly as long as I had only one dictionary of keys mapping
>> to one dictionary of functions, but now I want two of each. My program
>> has different modes, which may have varying keystrokes, and I also
>> have some global keystrokes which are the same across all modes, like
>> exiting or switching modes. I cannot figure out how to make the
>> message loop look in two dictionaries at onc. I tried using an if,
>> saying that if action_to_take was not set in the mode-specific
>> dictionary then look at the global dictionary, but it is like it is
>> never looking in the global dictionary at all. I get no syntax errors
>> or problems when running the program, so it has to be something in my
>> logic. Go to
>> http://www.gateway2somewhere.com/sw/main.pyw
>> to see what I mean; the problem code is near the very bottom of the
>> file. Thanks for any suggestions. Oh, please note that I indent one
>> space per indentation level.
>>
> "msg.wParam" gives an int, but the keys of globalFuncs are 'g1', etc,
> not ints.
That did it. I originally used 1-4 like I did for the mode
dictionaries, not realizing that the ints were so important; I figured
they were just keys in the dictionary and that they could be anything,
it was just easier to use ints. Now, I have changed my globals to
20-23 and everything seems to be going well. Thanks!!
> Incidentally, you might want to change:
>
>      if(not action_to_take):
>
> to:
>
>      if action_to_take is None:
>
> in case any of the values happen to be 0 (if not now, then possibly at
> some time in the future).
Sorry, could you explain why you suggested this? I do not follow.
Because of the if statement "if action_to_take:", I figured it was
saying "if action_to_take was successfully set" or something else
having a boolean value. Guess not?
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From pruebauno at latinmail.com  Tue Mar 23 14:09:45 2010
From: pruebauno at latinmail.com (nn)
Date: Tue, 23 Mar 2010 11:09:45 -0700 (PDT)
Subject: Unicode blues in Python3
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
	<mailman.1097.1269367117.23598.python-list@python.org>
Message-ID: <f7baac84-3443-4eae-b348-74d88eea7b83@g4g2000yqa.googlegroups.com>



Rami Chowdhury wrote:
> On Tuesday 23 March 2010 10:33:33 nn wrote:
> > I know that unicode is the way to go in Python 3.1, but it is getting
> > in my way right now in my Unix scripts. How do I write a chr(253) to a
> > file?
> >
> > #nntst2.py
> > import sys,codecs
> > mychar=chr(253)
> > print(sys.stdout.encoding)
> > print(mychar)
>
> The following code works for me:
>
> $ cat nnout5.py
> #!/usr/bin/python3.1
>
> import sys
> mychar = chr(253)
> sys.stdout.write(mychar)
> $ echo $(cat nnout)
> ?
>
> Can I ask why you're using print() in the first place, rather than writing
> directly to a file? Python 3.x, AFAIK, distinguishes between text and binary > files and will let you specify the encoding you want for strings you write.
>
> Hope that helps,
> Rami
> >
> >  > ./nntst2.py
> >
> > ISO8859-1
> > ?
> >
> >  > ./nntst2.py >nnout2
> >
> > Traceback (most recent call last):
> >   File "./nntst2.py", line 5, in <module>
> >     print(mychar)
> > UnicodeEncodeError: 'ascii' codec can't encode character '\xfd' in
> > position 0: ordinal not in range(128)
> >
> > > cat nnout2
> >
> > ascii
> >
> > ..Oh great!
> >
> > ok lets try this:
> > #nntst3.py
> > import sys,codecs
> > mychar=chr(253)
> > print(sys.stdout.encoding)
> > print(mychar.encode('latin1'))
> >
> > > ./nntst3.py
> >
> > ISO8859-1
> > b'\xfd'
> >
> > > ./nntst3.py >nnout3
> > >
> > > cat nnout3
> >
> > ascii
> > b'\xfd'
> >
> > ..Eh... not what I want really.
> >
> > #nntst4.py
> > import sys,codecs
> > mychar=chr(253)
> > print(sys.stdout.encoding)
> > sys.stdout=codecs.getwriter("latin1")(sys.stdout)
> > print(mychar)
> >
> >  > ./nntst4.py
> >
> > ISO8859-1
> > Traceback (most recent call last):
> >   File "./nntst4.py", line 6, in <module>
> >     print(mychar)
> >   File "Python-3.1.2/Lib/codecs.py", line 356, in write
> >     self.stream.write(data)
> > TypeError: must be str, not bytes
> >
> > ..OK, this is not working either.
> >
> > Is there any way to write a value 253 to standard output?
>

#nntst5.py
import sys
mychar=chr(253)
sys.stdout.write(mychar)

> ./nntst5.py >nnout5
Traceback (most recent call last):
  File "./nntst5.py", line 4, in <module>
    sys.stdout.write(mychar)
UnicodeEncodeError: 'ascii' codec can't encode character '\xfd' in
position 0: ordinal not in range(128)

equivalent to print.

I use print so I can do tests and debug runs to the screen or pipe it
to some other tool and then configure the production bash script to
write the final output to a file of my choosing.


From gherron at islandtraining.com  Tue Mar 23 14:11:15 2010
From: gherron at islandtraining.com (Gary Herron)
Date: Tue, 23 Mar 2010 11:11:15 -0700
Subject: Unicode blues in Python3
In-Reply-To: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
Message-ID: <4BA90443.6060307@islandtraining.com>

nn wrote:
> I know that unicode is the way to go in Python 3.1, but it is getting
> in my way right now in my Unix scripts. How do I write a chr(253) to a
> file?
>   

Python3 make a distinction between bytes and string(i.e., unicode) 
types, and you are still thinking in the Python2 mode that does *NOT* 
make such a distinction.  What you appear to want is to write a 
particular byte to a file -- so use the bytes type and a file open in 
binary mode:

 >>> b=bytes([253])
 >>> f = open("abc", 'wb')
 >>> f.write(b)
1
 >>> f.close()

On unix (at least), the "od" program can verify the contents is correct:
 > od abc -d
0000000   253
0000001


Hope that helps.

Gary Herron



> #nntst2.py
> import sys,codecs
> mychar=chr(253)
> print(sys.stdout.encoding)
> print(mychar)
>
>  > ./nntst2.py
> ISO8859-1
> ?
>
>  > ./nntst2.py >nnout2
> Traceback (most recent call last):
>   File "./nntst2.py", line 5, in <module>
>     print(mychar)
> UnicodeEncodeError: 'ascii' codec can't encode character '\xfd' in
> position 0: ordinal not in range(128)
>
>   
>> cat nnout2
>>     
> ascii
>
> ..Oh great!
>
> ok lets try this:
> #nntst3.py
> import sys,codecs
> mychar=chr(253)
> print(sys.stdout.encoding)
> print(mychar.encode('latin1'))
>
>   
>> ./nntst3.py
>>     
> ISO8859-1
> b'\xfd'
>
>   
>> ./nntst3.py >nnout3
>>     
>
>   
>> cat nnout3
>>     
> ascii
> b'\xfd'
>
> ..Eh... not what I want really.
>
> #nntst4.py
> import sys,codecs
> mychar=chr(253)
> print(sys.stdout.encoding)
> sys.stdout=codecs.getwriter("latin1")(sys.stdout)
> print(mychar)
>
>  > ./nntst4.py
> ISO8859-1
> Traceback (most recent call last):
>   File "./nntst4.py", line 6, in <module>
>     print(mychar)
>   File "Python-3.1.2/Lib/codecs.py", line 356, in write
>     self.stream.write(data)
> TypeError: must be str, not bytes
>
> ..OK, this is not working either.
>
> Is there any way to write a value 253 to standard output?
>   




From pruebauno at latinmail.com  Tue Mar 23 14:46:33 2010
From: pruebauno at latinmail.com (nn)
Date: Tue, 23 Mar 2010 11:46:33 -0700 (PDT)
Subject: Unicode blues in Python3
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
	<mailman.1099.1269367884.23598.python-list@python.org>
Message-ID: <3a428b39-bab1-48f2-b7df-560a849b8883@d27g2000yqf.googlegroups.com>



Gary Herron wrote:
> nn wrote:
> > I know that unicode is the way to go in Python 3.1, but it is getting
> > in my way right now in my Unix scripts. How do I write a chr(253) to a
> > file?
> >
>
> Python3 make a distinction between bytes and string(i.e., unicode)
> types, and you are still thinking in the Python2 mode that does *NOT*
> make such a distinction.  What you appear to want is to write a
> particular byte to a file -- so use the bytes type and a file open in
> binary mode:
>
>  >>> b=bytes([253])
>  >>> f = open("abc", 'wb')
>  >>> f.write(b)
> 1
>  >>> f.close()
>
> On unix (at least), the "od" program can verify the contents is correct:
>  > od abc -d
> 0000000   253
> 0000001
>
>
> Hope that helps.
>
> Gary Herron
>
>
>
> > #nntst2.py
> > import sys,codecs
> > mychar=chr(253)
> > print(sys.stdout.encoding)
> > print(mychar)
> >
> >  > ./nntst2.py
> > ISO8859-1
> > ?
> >
> >  > ./nntst2.py >nnout2
> > Traceback (most recent call last):
> >   File "./nntst2.py", line 5, in <module>
> >     print(mychar)
> > UnicodeEncodeError: 'ascii' codec can't encode character '\xfd' in
> > position 0: ordinal not in range(128)
> >
> >
> >> cat nnout2
> >>
> > ascii
> >
> > ..Oh great!
> >
> > ok lets try this:
> > #nntst3.py
> > import sys,codecs
> > mychar=chr(253)
> > print(sys.stdout.encoding)
> > print(mychar.encode('latin1'))
> >
> >
> >> ./nntst3.py
> >>
> > ISO8859-1
> > b'\xfd'
> >
> >
> >> ./nntst3.py >nnout3
> >>
> >
> >
> >> cat nnout3
> >>
> > ascii
> > b'\xfd'
> >
> > ..Eh... not what I want really.
> >
> > #nntst4.py
> > import sys,codecs
> > mychar=chr(253)
> > print(sys.stdout.encoding)
> > sys.stdout=codecs.getwriter("latin1")(sys.stdout)
> > print(mychar)
> >
> >  > ./nntst4.py
> > ISO8859-1
> > Traceback (most recent call last):
> >   File "./nntst4.py", line 6, in <module>
> >     print(mychar)
> >   File "Python-3.1.2/Lib/codecs.py", line 356, in write
> >     self.stream.write(data)
> > TypeError: must be str, not bytes
> >
> > ..OK, this is not working either.
> >
> > Is there any way to write a value 253 to standard output?
> >

Actually what I want is to write a particular byte to standard output,
and I want this to work regardless of where that output gets sent to.
I am aware that I could do
open('nnout','w',encoding='latin1').write(mychar) but I am porting a
python2 program and don't want to rewrite everything that uses that
script.


From iamforufriends at gmail.com  Tue Mar 23 15:21:50 2010
From: iamforufriends at gmail.com (MARRY)
Date: Tue, 23 Mar 2010 12:21:50 -0700 (PDT)
Subject: DRUNK MOM AND BOY... HOT CLIP.....
Message-ID: <1ff5a046-d2c3-40d2-a1f7-7e3b20d30dd2@a37g2000prd.googlegroups.com>

DRUNK MOM AND BOY... HOT CLIP.....

http://123sex4u.blogspot.com/

http://123sex4u.blogspot.com/

http://123sex4u.blogspot.com/

http://123sex4u.blogspot.com/


From python at mrabarnett.plus.com  Tue Mar 23 15:37:51 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 23 Mar 2010 19:37:51 +0000
Subject: using message loop for hotkey capturing
In-Reply-To: <bc7f680c1003231104i32879481ga3b3b2b16cec373b@mail.gmail.com>
References: <bc7f680c1003231001rfeb6f33ve4d04d36d32e737a@mail.gmail.com>	
	<4BA90072.9060305@mrabarnett.plus.com>
	<bc7f680c1003231104i32879481ga3b3b2b16cec373b@mail.gmail.com>
Message-ID: <4BA9188F.407@mrabarnett.plus.com>

Alex Hall wrote:
> On 3/23/10, MRAB <python at mrabarnett.plus.com> wrote:
[snip]
>> Incidentally, you might want to change:
>>
>>      if(not action_to_take):
>>
>> to:
>>
>>      if action_to_take is None:
>>
>> in case any of the values happen to be 0 (if not now, then possibly at
>> some time in the future).
> Sorry, could you explain why you suggested this? I do not follow.
> Because of the if statement "if action_to_take:", I figured it was
> saying "if action_to_take was successfully set" or something else
> having a boolean value. Guess not?
> 
The code:

     globalFuncs.get (msg.wParam)

returns None if the key isn't in the dict.

'if' and 'while' statements treat other objects than just True as True,
in fact anything for which bool() returns True. For example:

     bool(100) returns True
     bool([1, 2, 3]) returns True
     bool('some text') returns True

but:

     bool(0) returns False
     bool([]) returns False
     bool('') returns False
     bool(None) returns False

I also just noticed that you don't give action_to_take a default value
before checking whether it's a hotkey. Suppose that "msg.message ==
win32con.WM_HOTKEY" was False:

   if msg.message == win32con.WM_HOTKEY:
    action_to_take=globalFuncs.get (msg.wParam)
   if(not action_to_take):

It would get to "if(not action_to_take):" and either find that
action_to_take wasn't defined, or use the value from the previous pass
through the loop.


From bahesanhak at gmail.com  Tue Mar 23 15:48:19 2010
From: bahesanhak at gmail.com (=?UTF-8?B?2YXYpNmF2YYg2YXYtdmE2K0=?=)
Date: Tue, 23 Mar 2010 12:48:19 -0700 (PDT)
Subject: Miracles of the devil and beat of the revolution of religious reform
Message-ID: <16ec4cd6-a68d-4ba4-a55f-8d75d93358ca@b7g2000yqd.googlegroups.com>



Follow what god revealed to the Almighty

Peace be upon you

Those who wish to familiarized themselves after you click on the link
please wait a little until it opens the link

Miracles of the devil and beat  of the revolution of religious reform

http://www.ushaaqallah.com/forum/viewtopic.php?f=22&t=19225&sid=49b706e316461bcd768accfb7ccf031c

Peace be upon you


From stefan_ml at behnel.de  Tue Mar 23 15:57:32 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Tue, 23 Mar 2010 20:57:32 +0100
Subject: Unicode blues in Python3
In-Reply-To: <3a428b39-bab1-48f2-b7df-560a849b8883@d27g2000yqf.googlegroups.com>
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>	<mailman.1099.1269367884.23598.python-list@python.org>
	<3a428b39-bab1-48f2-b7df-560a849b8883@d27g2000yqf.googlegroups.com>
Message-ID: <hob6fc$o9$1@dough.gmane.org>

nn, 23.03.2010 19:46:
> Actually what I want is to write a particular byte to standard output,
> and I want this to work regardless of where that output gets sent to.
> I am aware that I could do
> open('nnout','w',encoding='latin1').write(mychar) but I am porting a
> python2 program and don't want to rewrite everything that uses that
> script.

Are you writing text or binary data to stdout?

Stefan



From debatem1 at gmail.com  Tue Mar 23 16:04:55 2010
From: debatem1 at gmail.com (geremy condra)
Date: Tue, 23 Mar 2010 16:04:55 -0400
Subject: Python is cool!!
In-Reply-To: <4BA8F56D.6060305@timgolden.me.uk>
References: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
	<4BA8F56D.6060305@timgolden.me.uk>
Message-ID: <f3cc57c61003231304u38f71ee7xd7e52187e310827b@mail.gmail.com>

On Tue, Mar 23, 2010 at 1:07 PM, Tim Golden <mail at timgolden.me.uk> wrote:
> On 23/03/2010 16:55, Jose Manuel wrote:
>>
>> I have been learning Python, and it is amazing .... I am using the
>> tutorial that comes with the official distribution.
>>
>> At the end my goal is to develop applied mathematic in engineering
>> applications to be published on the Web, specially on app. oriented to
>> simulations and control systems, I was about to start learning Java
>> but I found Python which seems easier to learn that Java.
>>
>> Would it be easy to integrate Python in Web pages with HTML? I have
>> read many info on Internet saying it is, and I hope so ....
>
> You probably want to be looking at IronPython and Silverlight.
> In fact, the prolific Michael Foord has already produced an
> example of this, which gives you the Python tutorial online!
>
> ?http://trypython.org
>
> TJG

Granted that I know next to nothing about webwork, but
is there a reason why you recommended a competing,
nonstandard technology rather than simply pointing him
towards more standards compliant tools that exist to do
exactly what he asked for? Seems a bit dodgy to
advocate a closed solution when the alternative has 100%
market share.

Geremy Condra


From mail at timgolden.me.uk  Tue Mar 23 16:12:27 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Tue, 23 Mar 2010 20:12:27 +0000
Subject: Python is cool!!
In-Reply-To: <f3cc57c61003231304u38f71ee7xd7e52187e310827b@mail.gmail.com>
References: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>	<4BA8F56D.6060305@timgolden.me.uk>
	<f3cc57c61003231304u38f71ee7xd7e52187e310827b@mail.gmail.com>
Message-ID: <4BA920AB.2070206@timgolden.me.uk>

On 23/03/2010 20:04, geremy condra wrote:
> On Tue, Mar 23, 2010 at 1:07 PM, Tim Golden<mail at timgolden.me.uk>  wrote:
>> On 23/03/2010 16:55, Jose Manuel wrote:
>>> Would it be easy to integrate Python in Web pages with HTML? I have
>>> read many info on Internet saying it is, and I hope so ....
>>
>> You probably want to be looking at IronPython and Silverlight.
>> In fact, the prolific Michael Foord has already produced an
>> example of this, which gives you the Python tutorial online!
>>
>>   http://trypython.org
>>
>> TJG
>
> Granted that I know next to nothing about webwork, but
> is there a reason why you recommended a competing,
> nonstandard technology rather than simply pointing him
> towards more standards compliant tools that exist to do
> exactly what he asked for? Seems a bit dodgy to
> advocate a closed solution when the alternative has 100%
> market share.

I can't say I thought *very* hard before sending that but...
The OP asked for "integrate Python in Web Pages with HTML"
which I understood -- perhaps wrongly -- to mean: run Python
in the browser. The only two ways I'm aware of doing that
in Python are the undersupported Python-as-IE-scripting-language
and IronPython/Silverlight.

Now I look again, I realise that he may have meant simply:
Python as a server-side toolset with possible support for
Javascript. In which case, of course, my answer was not
so applicable.

TJG


From pruebauno at latinmail.com  Tue Mar 23 16:36:20 2010
From: pruebauno at latinmail.com (nn)
Date: Tue, 23 Mar 2010 13:36:20 -0700 (PDT)
Subject: Unicode blues in Python3
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
	<mailman.1099.1269367884.23598.python-list@python.org>
	<3a428b39-bab1-48f2-b7df-560a849b8883@d27g2000yqf.googlegroups.com>
	<mailman.1101.1269374267.23598.python-list@python.org>
Message-ID: <c75d1abb-2674-4c67-9701-38946b5db58f@l25g2000yqd.googlegroups.com>



Stefan Behnel wrote:
> nn, 23.03.2010 19:46:
> > Actually what I want is to write a particular byte to standard output,
> > and I want this to work regardless of where that output gets sent to.
> > I am aware that I could do
> > open('nnout','w',encoding='latin1').write(mychar) but I am porting a
> > python2 program and don't want to rewrite everything that uses that
> > script.
>
> Are you writing text or binary data to stdout?
>
> Stefan

latin1 charset text.


From torriem at gmail.com  Tue Mar 23 16:47:20 2010
From: torriem at gmail.com (Michael Torrie)
Date: Tue, 23 Mar 2010 14:47:20 -0600
Subject: Python is cool!!
In-Reply-To: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
References: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
Message-ID: <4BA928D8.4050903@gmail.com>

Jose Manuel wrote:
> Would it be easy to integrate Python in Web pages with HTML? I have
> read many info on Internet saying it is, and I hope so ....

Django is, among several other similar projects and frameworks, very
popular for generating web apps in Python.  I have only used Django and
it works very well.


From chambon.pascal at wanadoo.fr  Tue Mar 23 16:49:14 2010
From: chambon.pascal at wanadoo.fr (Pascal Chambon)
Date: Tue, 23 Mar 2010 21:49:14 +0100
Subject: Castrated traceback in sys.exc_info()
In-Reply-To: <op.u90bjsorx6zn5v@lepton.softlabbsas.com.ar>
References: <7866674b-46ba-49e2-9d76-e8259ba22df0@z3g2000yqz.googlegroups.com>	<20100317124019.7013dfa3@moriz.interne>	<9fd96c3b1003170542t4ea864c6y359107cb747536da@mail.gmail.com>	<op.u9uflwxxx6zn5v@lepton.softlabbsas.com.ar>	<4BA7B4F7.6080404@wanadoo.fr>
	<op.u90bjsorx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <4BA9294A.9090703@wanadoo.fr>

Gabriel Genellina a ?crit :
>
> En Mon, 22 Mar 2010 15:20:39 -0300, Pascal Chambon 
> <chambon.pascal at wanadoo.fr> escribi?:
>>
>> Allright, here is more concretely the problem :
>>
>> ERROR:root:An error
>> Traceback (most recent call last):
>>   File "C:/Users/Pakal/Desktop/aaa.py", line 7, in c
>>     return d()
>>   File "C:/Users/Pakal/Desktop/aaa.py", line 11, in d
>>     def d(): raise ValueError
>> ValueError
>>  >>>
>>
>> As you see, the traceback only starts from function c, which handles 
>> the exception.
>> It doesn't show main(), a() and b(), which might however be (and are, 
>> in my case) critical to diagnose the severity of the problem (since 
>> many different paths would lead to calling c()).
>>
>> So the question is : is that possible to enforce, by a way or 
>> another, the retrieval of the FULL traceback at exception raising 
>> point, instead of that incomplete one ?
>
> Thanks for bringing this topic! I learned a lot trying to understand 
> what happens.
>
> The exception traceback (what sys.exc_info()[2] returns) is *not* a 
> complete stack trace. The sys module documentation is wrong [1] when 
> it says "...encapsulates the call stack at the point where the 
> exception originally occurred."
>
> The Language Reference is more clear [2]: "Traceback objects represent 
> a stack trace of an exception. A traceback object is created when an 
> exception occurs. When the search for an exception handler unwinds the 
> execution stack, at each unwound level a traceback object is inserted 
> in front of the current traceback. When an exception handler is 
> entered, the stack trace is made available to the program."
>
> That is, a traceback holds only the *forward* part of the stack: the 
> frames already exited when looking for an exception handler. Frames 
> going from the program starting point up to the current execution 
> point are *not* included.
>
> Conceptually, it's like having two lists: stack and traceback. The 
> complete stack trace is always stack+traceback. At each step (when 
> unwinding the stack, looking for a frame able to handle the current 
> exception) an item is popped from the top of the stack (last item) and 
> inserted at the head of the traceback.
>
> The traceback holds the "forward" path (from the current execution 
> point, to the frame where the exception was actually raised). It's a 
> linked list, its tb_next attribute holds a reference to the next item; 
> None marks the last one.
>
> The "back" path (going from the current execution point to its caller 
> and all the way to the program entry point) is a linked list of 
> frames; the f_back attribute points to the previous one, or None.
>
> In order to show a complete stack trace, one should combine both. The 
> traceback module contains several useful functions: extract_stack() + 
> extract_tb() are a starting point. The simplest way I could find to 
> make the logging module report a complete stack is to monkey patch 
> logging.Formatter.formatException so it uses format_exception() and 
> format_stack() combined (in fact it is simpler than the current 
> implementation using a StringIO object):
Good point, there is clearly a distinction between "stack trace" and 
"exception traceback" that I didn't know (actually, it seems no one 
makes it in computer literature).

> Good catch, Gabriel.
>
> There should be no need to monkey-patch the logging module - it's
> better if I include the change in the module itself. The only
> remaining question is that of backward compatibility, but I can do
> this for Python 2.7/3.2 only so that won't be an issue. It's probably
> a good idea to log an issue on the bug tracker, though, so we have
> some history for the change - do you want to do that, or shall I?
>
> Regards,
>
> Vinay Sajip
>   
Well having it fixed in logging would be great, but that kind of 
information is good to have in other circumstances, so shouldn't we 
rather advocate the availability of this "stack trace part" in exc_info 
too ?
This way, people like me who consider frames as black magic wouldn't 
need to meet complex stuffs as 
"traceback.format_stack(ei[2].tb_frame.f_back"  :p

Should I open an issue for this evolution of exceptiuon handling, or 
should we content ourselves of this "hacking" of frame stck ?

Regards,
Pascal







From pmaupin at gmail.com  Tue Mar 23 17:24:30 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Tue, 23 Mar 2010 14:24:30 -0700 (PDT)
Subject: Python is cool!!
References: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
	<4BA8F56D.6060305@timgolden.me.uk>
	<f3cc57c61003231304u38f71ee7xd7e52187e310827b@mail.gmail.com> 
	<mailman.1103.1269375152.23598.python-list@python.org>
Message-ID: <62d1f435-e473-4ba5-a7a6-334f5c69e4e3@d37g2000yqn.googlegroups.com>

On Mar 23, 3:12?pm, Tim Golden <m... at timgolden.me.uk> wrote:
> I can't say I thought *very* hard before sending that but...
> The OP asked for "integrate Python in Web Pages with HTML"
> which I understood -- perhaps wrongly -- to mean: run Python
> in the browser. The only two ways I'm aware of doing that
> in Python are the undersupported Python-as-IE-scripting-language
> and IronPython/Silverlight.

If I had to run Python in a browser, the first thing I would do is
turn to Pyjamas:  http://pyjs.org/

Regards,
Pat


From anand.shashwat at gmail.com  Tue Mar 23 17:50:16 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Wed, 24 Mar 2010 03:20:16 +0530
Subject: Python is cool!!
In-Reply-To: <62d1f435-e473-4ba5-a7a6-334f5c69e4e3@d37g2000yqn.googlegroups.com>
References: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
	<4BA8F56D.6060305@timgolden.me.uk>
	<f3cc57c61003231304u38f71ee7xd7e52187e310827b@mail.gmail.com> 
	<mailman.1103.1269375152.23598.python-list@python.org>
	<62d1f435-e473-4ba5-a7a6-334f5c69e4e3@d37g2000yqn.googlegroups.com>
Message-ID: <d4ab53de1003231450r229cc0ej50490393e19acefa@mail.gmail.com>

There is a project PyWhip (renamed as PyKata) which aims for the same
purpose. Google AppEmgine + Django does the trick for that. May be you can
take an inspiration or two from there especially because all code is open
to/for you.

~l0nwlf

On Wed, Mar 24, 2010 at 2:54 AM, Patrick Maupin <pmaupin at gmail.com> wrote:

> On Mar 23, 3:12 pm, Tim Golden <m... at timgolden.me.uk> wrote:
> > I can't say I thought *very* hard before sending that but...
> > The OP asked for "integrate Python in Web Pages with HTML"
> > which I understood -- perhaps wrongly -- to mean: run Python
> > in the browser. The only two ways I'm aware of doing that
> > in Python are the undersupported Python-as-IE-scripting-language
> > and IronPython/Silverlight.
>
> If I had to run Python in a browser, the first thing I would do is
> turn to Pyjamas:  http://pyjs.org/
>
> Regards,
> Pat
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From python at bdurham.com  Tue Mar 23 18:09:36 2010
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 23 Mar 2010 18:09:36 -0400
Subject: Pythonic way to trim and keep leading and trailing whitespace
Message-ID: <1269382176.23636.1366365237@webmail.messagingengine.com>

I'm looking for a pythonic way to trim and keep leading
whitespace in a string.

Use case: I have a bunch of text strings with various amounts of
leading and trailing whitespace (spaces and tabs). I want to grab
the leading and trailing whitespace, save it, surround the
remaining text with html tags, and then add back the leading and
trailing whitespace.

The only solution I can think of is regex, and that makes me
think of the 2 proverbial problems that come with that :)

Is there a 'better' solution than regex for this scenario? (Seems
like this would be a common type of string processing).

Thanks,
Malcolm
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From dpawlows at umich.edu  Tue Mar 23 18:13:36 2010
From: dpawlows at umich.edu (dpawlows)
Date: Tue, 23 Mar 2010 18:13:36 -0400
Subject: Posting to https
Message-ID: <0BAF76CC-8D91-4872-A5F2-EEC9F15C97AF@umich.edu>

I am trying to obtain data on a https site, but everytime I try to  
access the data that is behind the logon screen, I get the logon page  
instead.  I was able to successfully do a test problem:

import sys, urllib2, urllib

zipcode = "48103"
url = 'http://www.wunderground.com/cgi-bin/findweather/getForecast'
data = urllib.urlencode([('query', zipcode)])
req = urllib2.Request(url)
fd = urllib2.urlopen(req, data)
while 1:
     data = fd.read(1024)
     if not len(data):
         break
     sys.stdout.write(data)

which performed as I expected.

However, for the url 'https://secure.umcu.org/cgi-bin/mcw000.cgi?MCWSTART'
with data = ... {'HBUSERNAME':username,'PASSWORD':password}

I was sent just the logon screen. Am I missing something important  
that has to do with interaction with javascript, https, or cgi, or  
something completely different?


Thanks. 
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From pmaupin at gmail.com  Tue Mar 23 18:16:45 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Tue, 23 Mar 2010 17:16:45 -0500
Subject: Python is cool!!
In-Reply-To: <d4ab53de1003231450r229cc0ej50490393e19acefa@mail.gmail.com>
References: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
	<4BA8F56D.6060305@timgolden.me.uk>
	<f3cc57c61003231304u38f71ee7xd7e52187e310827b@mail.gmail.com>
	<mailman.1103.1269375152.23598.python-list@python.org>
	<62d1f435-e473-4ba5-a7a6-334f5c69e4e3@d37g2000yqn.googlegroups.com>
	<d4ab53de1003231450r229cc0ej50490393e19acefa@mail.gmail.com>
Message-ID: <d09829f51003231516r609fb196x22ce7e603ccb65b9@mail.gmail.com>

On Tue, Mar 23, 2010 at 4:50 PM, Shashwat Anand
<anand.shashwat at gmail.com> wrote:
> There is a project PyWhip (renamed as PyKata) which aims for the same
> purpose. Google AppEmgine + Django does the trick for that. May be you can
> take an inspiration or two from there especially because all code is open
> to/for you.

But, if I understand PyWhip/PyKata after glancing at the project page,
it doesn't actually run code in the browser...

Regards,
Pat


From emile at fenx.com  Tue Mar 23 18:34:48 2010
From: emile at fenx.com (Emile van Sebille)
Date: Tue, 23 Mar 2010 15:34:48 -0700
Subject: Pythonic way to trim and keep leading and trailing whitespace
In-Reply-To: <1269382176.23636.1366365237@webmail.messagingengine.com>
References: <1269382176.23636.1366365237@webmail.messagingengine.com>
Message-ID: <hobfpv$4vh$1@dough.gmane.org>

On 3/23/2010 3:09 PM python at bdurham.com said...
> I'm looking for a pythonic way to trim and keep leading
> whitespace in a string.
>
> Use case: I have a bunch of text strings with various amounts of
> leading and trailing whitespace (spaces and tabs). I want to grab
> the leading and trailing whitespace, save it, surround the
> remaining text with html tags, and then add back the leading and
> trailing whitespace.

I'd do it this way:

target = '  	spam and eggs	   '
stripped = target.strip()
replaced = target.replace(stripped,"<html>%s</html>" % stripped)

HTH,

Emile


>
> The only solution I can think of is regex, and that makes me
> think of the 2 proverbial problems that come with that :)
>
> Is there a 'better' solution than regex for this scenario? (Seems
> like this would be a common type of string processing).
>
> Thanks,
> Malcolm
>
>




From daniel.chiquito at gmail.com  Tue Mar 23 18:39:15 2010
From: daniel.chiquito at gmail.com (Daniel Chiquito)
Date: Tue, 23 Mar 2010 18:39:15 -0400
Subject: Pythonic way to trim and keep leading and trailing whitespace
In-Reply-To: <1269382176.23636.1366365237@webmail.messagingengine.com>
References: <1269382176.23636.1366365237@webmail.messagingengine.com>
Message-ID: <9deff17c1003231539kfdef1cfn5fd45e06e330d613@mail.gmail.com>

As far as I know, I don't think there is anything that strips it and returns
the material that was stripped. Regex's would be your best bet.

Daniel

On Tue, Mar 23, 2010 at 6:09 PM, <python at bdurham.com> wrote:

> I'm looking for a pythonic way to trim and keep leading whitespace in a
> string.
>
> Use case: I have a bunch of text strings with various amounts of leading
> and trailing whitespace (spaces and tabs). I want to grab the leading and
> trailing whitespace, save it, surround the remaining text with html tags,
> and then add back the leading and trailing whitespace.
>
> The only solution I can think of is regex, and that makes me think of the 2
> proverbial problems that come with that :)
>
> Is there a 'better' solution than regex for this scenario? (Seems like this
> would be a common type of string processing).
>
> Thanks,
> Malcolm
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


-- 
~
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From martin at v.loewis.de  Tue Mar 23 18:42:47 2010
From: martin at v.loewis.de (Martin v. Loewis)
Date: Tue, 23 Mar 2010 23:42:47 +0100
Subject: Unicode blues in Python3
In-Reply-To: <c75d1abb-2674-4c67-9701-38946b5db58f@l25g2000yqd.googlegroups.com>
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
	<mailman.1099.1269367884.23598.python-list@python.org>
	<3a428b39-bab1-48f2-b7df-560a849b8883@d27g2000yqf.googlegroups.com>
	<mailman.1101.1269374267.23598.python-list@python.org>
	<c75d1abb-2674-4c67-9701-38946b5db58f@l25g2000yqd.googlegroups.com>
Message-ID: <4BA943E7.5000202@v.loewis.de>

nn wrote:
> 
> Stefan Behnel wrote:
>> nn, 23.03.2010 19:46:
>>> Actually what I want is to write a particular byte to standard output,
>>> and I want this to work regardless of where that output gets sent to.
>>> I am aware that I could do
>>> open('nnout','w',encoding='latin1').write(mychar) but I am porting a
>>> python2 program and don't want to rewrite everything that uses that
>>> script.
>> Are you writing text or binary data to stdout?
>>
>> Stefan
> 
> latin1 charset text.

Are you sure about that? If you carefully reconsider, could you come to
the conclusion that you are not writing text at all, but binary data?

If it really was text that you write, why do you need to use
U+00FD (LATIN SMALL LETTER Y WITH ACUTE). To my knowledge, that
character is really infrequently used in practice. So that you try to
write it strongly suggests that it is not actually text what you are
writing.

Also, your formulation suggests the same:

"Is there any way to write a value 253 to standard output?"

If you would really be writing text, you'd ask


"Is there any way to write '?' to standard output?"

Regards,
Martin


From vinay_sajip at yahoo.co.uk  Tue Mar 23 18:43:40 2010
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Tue, 23 Mar 2010 15:43:40 -0700 (PDT)
Subject: Castrated traceback in sys.exc_info()
References: <7866674b-46ba-49e2-9d76-e8259ba22df0@z3g2000yqz.googlegroups.com>
	<20100317124019.7013dfa3@moriz.interne>
	<9fd96c3b1003170542t4ea864c6y359107cb747536da@mail.gmail.com> 
	<op.u9uflwxxx6zn5v@lepton.softlabbsas.com.ar>
	<4BA7B4F7.6080404@wanadoo.fr> 
	<op.u90bjsorx6zn5v@lepton.softlabbsas.com.ar>
	<mailman.1105.1269377396.23598.python-list@python.org>
Message-ID: <0301d0b5-5d5d-436f-a342-16fe81b340d7@t41g2000yqt.googlegroups.com>

On Mar 23, 8:49?pm, Pascal Chambon <chambon.pas... at wanadoo.fr> wrote:
>
> Should I open an issue for this evolution of exceptiuon handling, or
> should we content ourselves of this "hacking" of frame stck ?
>

Possibly worth raising an issue (not logging-related), but perhaps
it's worth seeing if this has come up before creating the issue.

Regards,

Vinay Sajip


From python at bdurham.com  Tue Mar 23 18:45:36 2010
From: python at bdurham.com (python at bdurham.com)
Date: Tue, 23 Mar 2010 18:45:36 -0400
Subject: Pythonic way to trim and keep leading and trailing whitespace
In-Reply-To: <hobfpv$4vh$1@dough.gmane.org>
References: <1269382176.23636.1366365237@webmail.messagingengine.com>
	<hobfpv$4vh$1@dough.gmane.org>
Message-ID: <1269384336.29264.1366374513@webmail.messagingengine.com>

Emile,

> target = '  	spam and eggs	   '
> stripped = target.strip()
> replaced = target.replace(stripped,"<html>%s</html>" % stripped)

Brilliant! That's just the type of clever solution I was looking for.

Thank you!

Malcolm



----- Original message -----
From: "Emile van Sebille" <emile at fenx.com>
To: python-list at python.org
Date: Tue, 23 Mar 2010 15:34:48 -0700
Subject: Re: Pythonic way to trim and keep leading and trailing
whitespace

On 3/23/2010 3:09 PM python at bdurham.com said...
> I'm looking for a pythonic way to trim and keep leading
> whitespace in a string.
>
> Use case: I have a bunch of text strings with various amounts of
> leading and trailing whitespace (spaces and tabs). I want to grab
> the leading and trailing whitespace, save it, surround the
> remaining text with html tags, and then add back the leading and
> trailing whitespace.

I'd do it this way:

target = '      spam and eggs      '
stripped = target.strip()
replaced = target.replace(stripped,"<html>%s</html>" % stripped)

HTH,

Emile


>
> The only solution I can think of is regex, and that makes me
> think of the 2 proverbial problems that come with that :)
>
> Is there a 'better' solution than regex for this scenario? (Seems
> like this would be a common type of string processing).
>
> Thanks,
> Malcolm
>
>


-- 
http://mail.python.org/mailman/listinfo/python-list



From anand.shashwat at gmail.com  Tue Mar 23 18:50:25 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Wed, 24 Mar 2010 04:20:25 +0530
Subject: Pythonic way to trim and keep leading and trailing whitespace
In-Reply-To: <9deff17c1003231539kfdef1cfn5fd45e06e330d613@mail.gmail.com>
References: <1269382176.23636.1366365237@webmail.messagingengine.com> 
	<9deff17c1003231539kfdef1cfn5fd45e06e330d613@mail.gmail.com>
Message-ID: <d4ab53de1003231550j6bc6bebbh8693445ceba0a087@mail.gmail.com>

regex is not goto that you should always avoid using it. It have its own
use-case, here regex solution is intuitive although @emile have done this
for you via string manpulation.

On Wed, Mar 24, 2010 at 4:09 AM, Daniel Chiquito
<daniel.chiquito at gmail.com>wrote:

> As far as I know, I don't think there is anything that strips it and
> returns the material that was stripped. Regex's would be your best bet.
>
> Daniel
>
> On Tue, Mar 23, 2010 at 6:09 PM, <python at bdurham.com> wrote:
>
>> I'm looking for a pythonic way to trim and keep leading whitespace in a
>> string.
>>
>> Use case: I have a bunch of text strings with various amounts of leading
>> and trailing whitespace (spaces and tabs). I want to grab the leading and
>> trailing whitespace, save it, surround the remaining text with html tags,
>> and then add back the leading and trailing whitespace.
>>
>> The only solution I can think of is regex, and that makes me think of the
>> 2 proverbial problems that come with that :)
>>
>> Is there a 'better' solution than regex for this scenario? (Seems like
>> this would be a common type of string processing).
>>
>> Thanks,
>> Malcolm
>>
>>
>>
>> --
>>
>> http://mail.python.org/mailman/listinfo/python-list
>>
>>
>
>
> --
> ~
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From python.list at tim.thechases.com  Tue Mar 23 19:38:10 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 23 Mar 2010 18:38:10 -0500
Subject: Pythonic way to trim and keep leading and trailing whitespace
In-Reply-To: <1269382176.23636.1366365237@webmail.messagingengine.com>
References: <1269382176.23636.1366365237@webmail.messagingengine.com>
Message-ID: <4BA950E2.4020708@tim.thechases.com>

python at bdurham.com wrote:
> I'm looking for a pythonic way to trim and keep leading
> whitespace in a string.
> 
> Use case: I have a bunch of text strings with various amounts of
> leading and trailing whitespace (spaces and tabs). I want to grab
> the leading and trailing whitespace, save it, surround the
> remaining text with html tags, and then add back the leading and
> trailing whitespace.
> 
> The only solution I can think of is regex, and that makes me
> think of the 2 proverbial problems that come with that :)

Just in case you're okay with a regexp solution, you can use

   >>> s = "\t\tabc def   "
   >>> import re
   >>> r = re.compile(r'^(\s*)(.*?)(\s*)$')
   >>> m = re.match(s)
   >>> m.groups()
   ('\t\t', 'abc def', '   ')
   >>> leading, text, trailing = m.groups()

While Emile's solution works nicely for your particular use-case, 
in the event you need to discern between leading/trailing 
whitespace, the above makes it pretty easy.

-tkc





From martin.hellwig at dcuktec.org  Tue Mar 23 19:57:23 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Tue, 23 Mar 2010 23:57:23 +0000
Subject: Pythonic way to trim and keep leading and trailing whitespace
In-Reply-To: <mailman.1114.1269387500.23598.python-list@python.org>
References: <1269382176.23636.1366365237@webmail.messagingengine.com>
	<mailman.1114.1269387500.23598.python-list@python.org>
Message-ID: <hobkgu$ibs$1@news.eternal-september.org>

On 03/23/10 23:38, Tim Chase wrote:
<cut>
> Just in case you're okay with a regexp solution, you can use
>
>  >>> s = "\t\tabc def "
>  >>> import re
>  >>> r = re.compile(r'^(\s*)(.*?)(\s*)$')
>  >>> m = re.match(s)
>  >>> m.groups()
> ('\t\t', 'abc def', ' ')
>  >>> leading, text, trailing = m.groups()
<cut>
Ahhh regex, the hammer, Swiss Army Knife, cable tie, duct tape, 
superglue and soldering iron, all wrapped in one*. Mastery of it will 
enable you to drive the nails in your coffin at an incomparable speed. :-)

*Yes I was a sysadmin, why do you ask?
-- 
mph


From nilly16 at yahoo.com  Tue Mar 23 20:05:09 2010
From: nilly16 at yahoo.com (Jimbo)
Date: Tue, 23 Mar 2010 17:05:09 -0700 (PDT)
Subject: Advice Criticism on Python App
Message-ID: <de18cb49-b0fd-4862-b9af-3743720e0db6@u19g2000prh.googlegroups.com>

I have made a Python App(really script) that will check a stocks
current values from a website & save that data to a SQLite 3 database.

I am looking for any suggestions & criticisms on what I should do
better or anything at all but mainly in these areas:
[QUOTE]
- Correct Python Layout of code
- Correct error checking: Am I catching all my errors or are my
exceptions not specific enough? Should I be using more try excepts
inside my functions?
- Are there any areas where huge errors, bugs etc could occur that I
have not compensated for?
- I am also looking for suggestions on how to write a function better,
so if you think that function is really bad & should be rewritten
completely or something I would really like to hear it.
- Anything else that you see
- Is python meant to be used in the way I have used it? To make a
'semi detailed' app?[/QUOTE]

Any advice criticism would be really helpful.

App:
[CODE]"""
 *Stock Data Builder*
   Algorithm:
      - Search website for stock
      - Get website HTML source code
      - Search code for target stock data(price,dividends,etc..)
      - Add data to text file
"""

import sys
import os
import sqlite3
import datetime
import time
import urllib2

### Global Variables ###
menu = "***Stock Program*** \n\n1. Add a Stock to track \n2. Get
Todays Tracking Data \n3. Exit \nEnter decision: "
target = '<th scope="row" class="row"><a href="/asx/research/
companyInfo.do?by=asxCode&asxCode=%s">%s</a>'
ASXurl = 'http://www.asx.com.au/asx/markets/priceLookup.do?
by=asxCodes&asxCodes='

class stock:
    code             = ""
    purchasePrice    = 0
    purchaseQuantity = 0
    price            = []  # list of recent prices
    recentBid        = []  # list of recent bids for stock
    recentOffer      = []  # list of recent offers for stock
    stockVol         = []  # list of stock quantity available on
market
    def __init__(self):
        """ Default Constructor """
        self.code             = ""
        self.purchasePrice    = 0
        self.purchaseQuantity = 0

    def constructor(self, stockCode, purPrice, purQuant):
        """ Constructor """
        self.code             = stockCode
        self.purchasePrice    = purPrice
        self.purchaseQuantity = purQuant

    def setData(self, stockCode, purPrice, purQuant, priceList,
reBidList, reOffList, popList):
        """ Defines & implements the objects' public variables """
        self.code             = stockCode
        self.purchasePrice    = purPrice
        self.purchaseQuantity = purQuant
        self.price            = priceList
        self.recentBid        = reBidList
        self.recentOffer      = reOffList
        self.stockVol         = popList

        self.printStats()

    def updateData(self, priceEle, bidEle, offerEle, populEle):
        """ Adds data to stock object's lists """
        self.price.append(priceEle)
        self.recentBid.append(bidEle)
        self.recentOffer.append(offerEle)
        self.stockVol.append(populEle)

    def printStats(self):
        """ Output Stock attributes """

        print("Stock Code: "+self.code)
        print("Stock Purchase Price: "+str(self.purchasePrice))
        print("Stock Quantity Owned: "+str(self.purchaseQuantity))
        print("***Initial Investment Value:
"+str(self.purchasePrice*self.purchaseQuantity))
        if not(len(self.price) <= 0):
            print("Stock Current Price: "+str(self.price[-1]))
            print("Recent Bid: "+str(self.recentBid[-1]))
            print("Recent Offer: "+str(self.recentOffer[-1]))
            print("Total Stock Volume in market:
"+str(self.stockVol[-1]))
            print("***Present Investment Value:
"+str(self.price[-1]*self.purchaseQuantity))
        print("\n")


### Functions ###
def connectDatabase(dbLocation, dbName, tableName):
    """ Establish & Return connection to SQLite Database """

    try:
        if not (os.path.exists(dbLocation)):
            os.mkdir(dbLocation) # create folder/dir

        os.chdir(dbLocation)        # change directory focus to
dbLocation
        conn = sqlite3.connect(dbLocation+dbName)
        cur = conn.cursor()
        try:
            createTableQ = "CREATE TABLE IF NOT EXISTS "+tableName
+" (code varchar PRIMARY KEY, purchase_price float, purchase_quantity
float, purchase_date varchar);"
            cur.execute(createTableQ)
            conn.commit()
        except:
            pass
        return conn
    except IOError or OSError:
        print "Connection to database failed"
        return False

def retrieveStockDatabase(conn, tableName):
    """ Read SQLite3 database & extract stock data into StockList """

    stockList  = []
    stockQuery = "select recent_price, recent_offer, recent_bid,
stock_volume from ? ;"
    cur = conn.cursor()
    cur.execute("select code, purchase_price, purchase_quantity from
"+tableName+";")

    for row in cur.fetchall():
        newStock = stock()
        newStock.code             = row[0]
        newStock.purchasePrice    = row[1]
        newStock.purchaseQuantity = row[2]
        cur.execute(stockQuery,[newStock.code])
        for rw in cur.fetchall():
            newStock.price.append(rw[0])
            newStock.recentOffer.append(rw[1])
            newStock.recentBid.append(rw[2])
            newStock.stockVol.append(rw[3])
        stockList.append(newStock)

    return stockList

def getDate():
    """ Return todays date in format DD:MM:YYYY """
    time = datetime.datetime.now()
    date = time.strftime("%d:%m:%Y") # string format time (%y)
    return date

def newStockDatabase(conn, stockTable, stock):
    """ Add a new stock to SQLite database if not already there
        We save the stocks code, purchase price, quantity purchased
        & date of purchase.                                       """
    cur = conn.cursor()
    try:
        createTableQ = "create table "+stock.code+" (date varchar
PRIMARY KEY, recent_price float, recent_offer float, recent_bid float,
stock_volume double);"
        stockQuery   = "insert into "+stockTable+"
values(?, ?, ?, ?);"
        cur.execute(createTableQ)
        cur.execute(stockQuery,
[stock.code,stock.purchasePrice,stock.purchaseQuant,getDate()])
        conn.commit()
    except IOError or OSError:
        print "Table may already exist or bad SQLite connection."
        return False

def webFormat(URL):

    if (URL.startswith("http://")==False):
        URL = "http://"+URL

    return URL

def getSource(URL):
    """ Retrieve HTML source code from website URL &
        save in sourceBuffer                       """

    try:
        URL = webFormat(URL) # make sure URL contains essential
"http://"
        sourceBuffer = urllib2.urlopen(URL)
        print '\nResponse code = ',sourceBuffer.code
        print 'Response headers = ',sourceBuffer.info()
        print 'Actual URL = ',sourceBuffer.geturl()
        sourceCode = sourceBuffer.read()
        sourceBuffer.close()
        return sourceCode

    except IOError:  # URLError
        print "Function Failed: Reasons could be invalid URL name \nOR
\nHTML protocol message transfer failure."
        return False # function failed

def getTargetText(targetStrtData, targetEndData, dataBuffer):
    """ Grabs target text that lies inside 'dataBuffer' string
        between targetStrtData & targetEndData                """

    try:
        result = dataBuffer.split(targetStrtData)
        result.pop(0)
        result = result[0].split(targetEndData)
        result.pop(1)
        print result
        return result
    except IOError:
        print "Function Failed: Reasons could be targetStrtData and/or
targetEndData is not present in dataBuffer."

def getStockData(htmlText, selectedStock):
    """ Extract stock data(stock code,price,etc) from htmlText """
    try:
        # Here I extract my number data from HTML text
        tempList = []
        for string in htmlText:
            for i in string.split('>'):
                for e in i.split():
                        if ('.' in e and e[0].isdigit()):
                            tempList.append(float(e))
                        elif (',' in e and e[0].isdigit() ):
                            # remove ',' chars
                            e = e.replace(',','')
                            tempList.append(float(e))

 
selectedStock.updateData(tempList[0],tempList[2],tempList[3],tempList[7])

    except IOError:  # is this the correct error I should be trying to
catch here??
        print "Function Failed: Reasons could be: sites HTML data has
changed. Consult author of program."
        return False

def createStockTracker(stockCode,stockPrice,stockQuant, stockList):
    """ Add a new stock to the database to track """
    newStock = stock()
    newStock.constructor(stockCode,stockPrice,stockQuant)
    stockList.append(newStock)
    return stockList

def writeStockToDatabase(conn, stock):
    """ Write ONLY this Stock's attributes to SQLite Database """

    cur = conn.cursor()
    date = getDate()

    tableName = stock.code
    stockquery = "insert into "+tableName+" values(?, ?, ?, ?, ?);"
    cur.execute(query,[date,stock.price[-1], stock.recentOffer[-1],
stock.recentBid[-1], stock.stockVol[-1]])
    conn.commit()

def writeAllToDatabase(conn, stockList):
    """ Enter recent Stock attributes into SQLite Database """

    cur = conn.cursor()
    date = getDate()

    for stock in stockList:
        tableName = stock.code
        stockquery = "insert into "+tableName+"
values(?, ?, ?, ?, ?);"
        cur.execute(query,[date,stock.price[-1],
stock.recentOffer[-1], stock.recentBid[-1], stock.stockVol[-1]])
        conn.commit()

### Input Functions ###
def inputNewStock():
    """ """
    print "*Please note only an Australian Securities Exchange(ASX)
listed stock can be tracked in Version 1.0."
    badInput = True

    while (badInput == True):
        try:
            code     = raw_input("Please enter the ASX code for the
stock you wish to track: ")
            price    = input("Please enter the individual stock value
for "+code+": ")
            quantity = input("Please enter the number/quantity of
stocks purchased: ")
            if (len(code)>3):
                badInput = True
            else : badInput = False
            return True
        except IOError:
            if (raw_input("Incorrect input. Note: ASX code cannot be
more than 3 chars. Press 'x' to exit or anything else to try
again")=='x'):
                return False
        badInput = True # this I am not sure if necessary to loop
correctly


### Main program loop ###
def main():
    programEnd = False;
    dbLocation = "C:\Users\Sam\Desktop\StockApp/"
    dbName     = "stockData.db"
    stockTable = "stocks"

    conn = connectDatabase(dbLocation,dbName,stockTable)
    stockList = retrieveStockDatabase(conn,stockTable)

    for s in stockList:
        s.printStats()

    while (programEnd == False):

        decision = input(menu) # Print Menu

        if (decision==1):

            if not(inputNewStock()==False):
                stockList =
createStockTracker(acode,price,quantity,stockList)
                newStockDatabase(conn,stockTable,stockList[-1])
                print("\n** New Stock **")
                stockList[-1].printStats()
                print "The stock "+code+" was successfully added to
our database. \nNow every time the program runs it will automatically
track this stock & obtain its stock attributes\n\n"
                # TO DO:
                # get new stock recent Data from internet etc.
                # add stock data to data base;
        elif (decision==2):
            if (len(stockList)>0):
                for Stock in stockList:
                    URL = ASXurl+Stock.code
                    sourceCode = getSource(URL)
                    targetData = getTargetText(target %
(Stock.code,Stock.code),"</tr>",sourceCode)
                    getStockData(targetData,Stock)
                    Stock.printStats()
                    #writeStockToDatabase(conn,Stock)
            else:
                print "You must first identify a stock to follow.
\nPlease select option 1."
        elif (decision==3):
            print "Thank you for using Stock Program. Goodbye.\n"
            programEnd = True; # Exit program

    conn.close()
    return 0 # End program

main()[/CODE]


From clp2 at rebertia.com  Tue Mar 23 21:32:11 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 23 Mar 2010 18:32:11 -0700
Subject: Advice Criticism on Python App
In-Reply-To: <de18cb49-b0fd-4862-b9af-3743720e0db6@u19g2000prh.googlegroups.com>
References: <de18cb49-b0fd-4862-b9af-3743720e0db6@u19g2000prh.googlegroups.com>
Message-ID: <50697b2c1003231832i280655adu9c52ee45f9c1de15@mail.gmail.com>

On Tue, Mar 23, 2010 at 5:05 PM, Jimbo <nilly16 at yahoo.com> wrote:
> I have made a Python App(really script) that will check a stocks
> current values from a website & save that data to a SQLite 3 database.
>
> I am looking for any suggestions & criticisms on what I should do
> better or anything at all but mainly in these areas:
<snip>
> Any advice criticism would be really helpful.

Complying with Python naming conventions would be one place to start:
* Class names should be in StudlyCaps (so class "Stock", not class "stock").
* Constants should be in UPPERCASE_WITH_UNDERSCORES.
* Most other names should be words_separated_by_underscores, not
camelCaseLikeThis; FWIW, I'm not a fan of this part of the guideline
personally.

Also, conditions don't need parentheses around them. So:
if (decision == 1): #WRONG! harder to read, extra syntactic noise
if decision == 1: #RIGHT

For many more style details, see PEP 8 -- Style Guide for Python Code:
http://www.python.org/dev/peps/pep-0008/

Additionally, the "return 0" in main() serves no purpose; the return
value isn't used as the exit code for the program. You can either
eliminate the line entirely or use plain "return" if you want the
extra clarity.

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


From python at mrabarnett.plus.com  Tue Mar 23 21:36:31 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 24 Mar 2010 01:36:31 +0000
Subject: Advice Criticism on Python App
In-Reply-To: <de18cb49-b0fd-4862-b9af-3743720e0db6@u19g2000prh.googlegroups.com>
References: <de18cb49-b0fd-4862-b9af-3743720e0db6@u19g2000prh.googlegroups.com>
Message-ID: <4BA96C9F.9080301@mrabarnett.plus.com>

Jimbo wrote:
> I have made a Python App(really script) that will check a stocks
> current values from a website & save that data to a SQLite 3 database.
> 
> I am looking for any suggestions & criticisms on what I should do
> better or anything at all but mainly in these areas:
> [QUOTE]
> - Correct Python Layout of code
> - Correct error checking: Am I catching all my errors or are my
> exceptions not specific enough? Should I be using more try excepts
> inside my functions?
> - Are there any areas where huge errors, bugs etc could occur that I
> have not compensated for?
> - I am also looking for suggestions on how to write a function better,
> so if you think that function is really bad & should be rewritten
> completely or something I would really like to hear it.
> - Anything else that you see
> - Is python meant to be used in the way I have used it? To make a
> 'semi detailed' app?[/QUOTE]
> 
> Any advice criticism would be really helpful.
> 
> App:
> [CODE]"""
>  *Stock Data Builder*
>    Algorithm:
>       - Search website for stock
>       - Get website HTML source code
>       - Search code for target stock data(price,dividends,etc..)
>       - Add data to text file
> """
> 
> import sys
> import os
> import sqlite3
> import datetime
> import time
> import urllib2
> 
> ### Global Variables ###
> menu = "***Stock Program*** \n\n1. Add a Stock to track \n2. Get
> Todays Tracking Data \n3. Exit \nEnter decision: "
> target = '<th scope="row" class="row"><a href="/asx/research/
> companyInfo.do?by=asxCode&asxCode=%s">%s</a>'
> ASXurl = 'http://www.asx.com.au/asx/markets/priceLookup.do?
> by=asxCodes&asxCodes='
> 
> class stock:
>     code             = ""
>     purchasePrice    = 0
>     purchaseQuantity = 0
>     price            = []  # list of recent prices
>     recentBid        = []  # list of recent bids for stock
>     recentOffer      = []  # list of recent offers for stock
>     stockVol         = []  # list of stock quantity available on
> market

This will be variables belonging to the class itself, not instances of
it.

>     def __init__(self):
>         """ Default Constructor """
>         self.code             = ""
>         self.purchasePrice    = 0
>         self.purchaseQuantity = 0
> 
>     def constructor(self, stockCode, purPrice, purQuant):
>         """ Constructor """
>         self.code             = stockCode
>         self.purchasePrice    = purPrice
>         self.purchaseQuantity = purQuant
> 
>     def setData(self, stockCode, purPrice, purQuant, priceList,
> reBidList, reOffList, popList):
>         """ Defines & implements the objects' public variables """
>         self.code             = stockCode
>         self.purchasePrice    = purPrice
>         self.purchaseQuantity = purQuant
>         self.price            = priceList
>         self.recentBid        = reBidList
>         self.recentOffer      = reOffList
>         self.stockVol         = popList
> 
>         self.printStats()
> 
>     def updateData(self, priceEle, bidEle, offerEle, populEle):
>         """ Adds data to stock object's lists """
>         self.price.append(priceEle)
>         self.recentBid.append(bidEle)
>         self.recentOffer.append(offerEle)
>         self.stockVol.append(populEle)
> 
>     def printStats(self):
>         """ Output Stock attributes """
> 
>         print("Stock Code: "+self.code)

In Python 2 'print' is a statement, so it doesn't need its arguments to
be enclosed in (). You could also use Python's string formatting:

         print "Stock Code: %s" % self.code

>         print("Stock Purchase Price: "+str(self.purchasePrice))
>         print("Stock Quantity Owned: "+str(self.purchaseQuantity))
>         print("***Initial Investment Value:
> "+str(self.purchasePrice*self.purchaseQuantity))
>         if not(len(self.price) <= 0):

'not' has a lower priority than '<=', and this can be simplified anyway:

         if len(self.price) > 0:

or even:

         if self.price:

because empty containers (eg lists) are treated as False, non-empty ones
as True, by 'if' and 'while' statements.

>             print("Stock Current Price: "+str(self.price[-1]))
>             print("Recent Bid: "+str(self.recentBid[-1]))
>             print("Recent Offer: "+str(self.recentOffer[-1]))
>             print("Total Stock Volume in market:
> "+str(self.stockVol[-1]))
>             print("***Present Investment Value:
> "+str(self.price[-1]*self.purchaseQuantity))
>         print("\n")
> 
> 
> ### Functions ###
> def connectDatabase(dbLocation, dbName, tableName):
>     """ Establish & Return connection to SQLite Database """
> 
>     try:
>         if not (os.path.exists(dbLocation)):
>             os.mkdir(dbLocation) # create folder/dir
> 
>         os.chdir(dbLocation)        # change directory focus to
> dbLocation

It's normally easier to use absolute paths instead of changing the
current directory.

>         conn = sqlite3.connect(dbLocation+dbName)

It's better to join paths using os.path.join() because that will insert
any directory separators for you.

>         cur = conn.cursor()
>         try:
>             createTableQ = "CREATE TABLE IF NOT EXISTS "+tableName
> +" (code varchar PRIMARY KEY, purchase_price float, purchase_quantity
> float, purchase_date varchar);"
>             cur.execute(createTableQ)
>             conn.commit()
>         except:
>             pass

DON'T USE BARE EXCEPTS, especially if you're just going to ignore the
exception. Exceptions can be raised for a variety of reasons, including
one you didn't expect due to bugs, so catch only what you expect.

>         return conn
>     except IOError or OSError:

The result of:

     IOError or OSError

is:

     IOError

What you want is:

     except (IOError, OSError):

Note: the parentheses are necessary here, otherwise it it would mean
"catch an IOError exception and then bind it to the name 'OSError'".

>         print "Connection to database failed"
>         return False
> 
Some times you return the connection, and other times False. A more
usual value than False in such cases is None (unless you're returning
True or False).

> def retrieveStockDatabase(conn, tableName):
>     """ Read SQLite3 database & extract stock data into StockList """
> 
>     stockList  = []
>     stockQuery = "select recent_price, recent_offer, recent_bid,
> stock_volume from ? ;"
>     cur = conn.cursor()
>     cur.execute("select code, purchase_price, purchase_quantity from
> "+tableName+";")
> 
>     for row in cur.fetchall():
>         newStock = stock()
>         newStock.code             = row[0]
>         newStock.purchasePrice    = row[1]
>         newStock.purchaseQuantity = row[2]
>         cur.execute(stockQuery,[newStock.code])
>         for rw in cur.fetchall():
>             newStock.price.append(rw[0])
>             newStock.recentOffer.append(rw[1])
>             newStock.recentBid.append(rw[2])
>             newStock.stockVol.append(rw[3])
>         stockList.append(newStock)
> 
>     return stockList
> 
> def getDate():
>     """ Return todays date in format DD:MM:YYYY """
>     time = datetime.datetime.now()
>     date = time.strftime("%d:%m:%Y") # string format time (%y)
>     return date
> 
> def newStockDatabase(conn, stockTable, stock):
>     """ Add a new stock to SQLite database if not already there
>         We save the stocks code, purchase price, quantity purchased
>         & date of purchase.                                       """
>     cur = conn.cursor()
>     try:
>         createTableQ = "create table "+stock.code+" (date varchar
> PRIMARY KEY, recent_price float, recent_offer float, recent_bid float,
> stock_volume double);"
>         stockQuery   = "insert into "+stockTable+"
> values(?, ?, ?, ?);"
>         cur.execute(createTableQ)
>         cur.execute(stockQuery,
> [stock.code,stock.purchasePrice,stock.purchaseQuant,getDate()])
>         conn.commit()
>     except IOError or OSError:
>         print "Table may already exist or bad SQLite connection."
>         return False
> 
> def webFormat(URL):
> 
>     if (URL.startswith("http://")==False):
>         URL = "http://"+URL
> 
Better as:

     if not URL.startswith("http://"):

The conditions of 'if' and 'while' statements don't need to enclosed in
parentheses like in C, Java, etc.

>     return URL
> 
> def getSource(URL):
>     """ Retrieve HTML source code from website URL &
>         save in sourceBuffer                       """
> 
>     try:
>         URL = webFormat(URL) # make sure URL contains essential
> "http://"
>         sourceBuffer = urllib2.urlopen(URL)
>         print '\nResponse code = ',sourceBuffer.code
>         print 'Response headers = ',sourceBuffer.info()
>         print 'Actual URL = ',sourceBuffer.geturl()
>         sourceCode = sourceBuffer.read()
>         sourceBuffer.close()
>         return sourceCode
> 
>     except IOError:  # URLError
>         print "Function Failed: Reasons could be invalid URL name \nOR
> \nHTML protocol message transfer failure."
>         return False # function failed
> 
> def getTargetText(targetStrtData, targetEndData, dataBuffer):
>     """ Grabs target text that lies inside 'dataBuffer' string
>         between targetStrtData & targetEndData                """
> 
>     try:
>         result = dataBuffer.split(targetStrtData)
>         result.pop(0)
>         result = result[0].split(targetEndData)
>         result.pop(1)
>         print result
>         return result
>     except IOError:
>         print "Function Failed: Reasons could be targetStrtData and/or
> targetEndData is not present in dataBuffer."
> 
You haven't given a return statement for when there's an error, so it'll
return None. It's probably clearer if you write a function in Python
either as a _function_ which _always_ returns a value or as a
_procedure_ which _never_ returns a value.

In Python the preference is for a function to raise an exception to
indicate an error instead of returning a flag.

> def getStockData(htmlText, selectedStock):
>     """ Extract stock data(stock code,price,etc) from htmlText """
>     try:
>         # Here I extract my number data from HTML text
>         tempList = []
>         for string in htmlText:
>             for i in string.split('>'):
>                 for e in i.split():
>                         if ('.' in e and e[0].isdigit()):
>                             tempList.append(float(e))
>                         elif (',' in e and e[0].isdigit() ):
>                             # remove ',' chars
>                             e = e.replace(',','')
>                             tempList.append(float(e))
> 
>  
> selectedStock.updateData(tempList[0],tempList[2],tempList[3],tempList[7])
> 
>     except IOError:  # is this the correct error I should be trying to
> catch here??
>         print "Function Failed: Reasons could be: sites HTML data has
> changed. Consult author of program."
>         return False
> 
> def createStockTracker(stockCode,stockPrice,stockQuant, stockList):
>     """ Add a new stock to the database to track """
>     newStock = stock()
>     newStock.constructor(stockCode,stockPrice,stockQuant)
>     stockList.append(newStock)
>     return stockList
> 
> def writeStockToDatabase(conn, stock):
>     """ Write ONLY this Stock's attributes to SQLite Database """
> 
>     cur = conn.cursor()
>     date = getDate()
> 
>     tableName = stock.code
>     stockquery = "insert into "+tableName+" values(?, ?, ?, ?, ?);"
>     cur.execute(query,[date,stock.price[-1], stock.recentOffer[-1],
> stock.recentBid[-1], stock.stockVol[-1]])
>     conn.commit()
> 
> def writeAllToDatabase(conn, stockList):
>     """ Enter recent Stock attributes into SQLite Database """
> 
>     cur = conn.cursor()
>     date = getDate()
> 
>     for stock in stockList:
>         tableName = stock.code
>         stockquery = "insert into "+tableName+"
> values(?, ?, ?, ?, ?);"
>         cur.execute(query,[date,stock.price[-1],
> stock.recentOffer[-1], stock.recentBid[-1], stock.stockVol[-1]])
>         conn.commit()
> 
> ### Input Functions ###
> def inputNewStock():
>     """ """
>     print "*Please note only an Australian Securities Exchange(ASX)
> listed stock can be tracked in Version 1.0."
>     badInput = True
> 
>     while (badInput == True):

Better as:

     while badInput:

>         try:
>             code     = raw_input("Please enter the ASX code for the
> stock you wish to track: ")

If you assign to a name in a function then that name will be treated as
a local name (variable) unless you say it's global in the function,
therefore 'code', etc, won't been seen outside this function.

>             price    = input("Please enter the individual stock value
> for "+code+": ")
>             quantity = input("Please enter the number/quantity of
> stocks purchased: ")
>             if (len(code)>3):
>                 badInput = True
>             else : badInput = False
>             return True

This will check the length, setting badInput accordingly, and then
return True.

>         except IOError:

I don't see anything in the 'try' block that will raise IOError.

>             if (raw_input("Incorrect input. Note: ASX code cannot be
> more than 3 chars. Press 'x' to exit or anything else to try
> again")=='x'):
>                 return False
>         badInput = True # this I am not sure if necessary to loop
> correctly
> 
You're not explicitly returning anything from the function when the loop
exits, so it would return None.

> 
> ### Main program loop ###
> def main():
>     programEnd = False;
>     dbLocation = "C:\Users\Sam\Desktop\StockApp/"

If your string contains literal backslashes then use raw strings
instead. Raw strings can end in a backslash, but that shouldn't matter
in the script if you're joining paths together using os.path.join().

>     dbName     = "stockData.db"
>     stockTable = "stocks"
> 
>     conn = connectDatabase(dbLocation,dbName,stockTable)
>     stockList = retrieveStockDatabase(conn,stockTable)
> 
>     for s in stockList:
>         s.printStats()
> 
>     while (programEnd == False):

Better as:

     while not programEnd:

> 
>         decision = input(menu) # Print Menu

input() is often considered a bad function to use because it's
equivalent to eval(raw_input()), so the user could enter any expression.
It's better to use int(raw_input()) in this case and then catch the
ValueError if what was entered isn't an int.

> 
>         if (decision==1):
> 
>             if not(inputNewStock()==False):

A double-negative, equivalent to:

             if inputNewStock() != False:

It would be more Pythonic if you had inputNewStock() return the code,
etc, or raise an exception if there was an error. You could then catch
that exception in a 'try' block.

>                 stockList =
> createStockTracker(acode,price,quantity,stockList)
>                 newStockDatabase(conn,stockTable,stockList[-1])
>                 print("\n** New Stock **")
>                 stockList[-1].printStats()
>                 print "The stock "+code+" was successfully added to
> our database. \nNow every time the program runs it will automatically
> track this stock & obtain its stock attributes\n\n"
>                 # TO DO:
>                 # get new stock recent Data from internet etc.
>                 # add stock data to data base;
>         elif (decision==2):
>             if (len(stockList)>0):

Better as:

             if stockList:

>                 for Stock in stockList:
>                     URL = ASXurl+Stock.code
>                     sourceCode = getSource(URL)
>                     targetData = getTargetText(target %
> (Stock.code,Stock.code),"</tr>",sourceCode)
>                     getStockData(targetData,Stock)
>                     Stock.printStats()
>                     #writeStockToDatabase(conn,Stock)
>             else:
>                 print "You must first identify a stock to follow.
> \nPlease select option 1."
>         elif (decision==3):
>             print "Thank you for using Stock Program. Goodbye.\n"
>             programEnd = True; # Exit program
> 
>     conn.close()
>     return 0 # End program
> 
'main' is called by the main program and its return value is never used,
so just omit this return statement.

> main()[/CODE]

The recommended standard in Python is for names of classes to be
CamelCase, names of constants to be UPPERCASE_WITH_UNDERSCORES, and
names of everything else to be lowercase_with_underscores.


From no.email at nospam.invalid  Tue Mar 23 21:39:49 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Tue, 23 Mar 2010 18:39:49 -0700
Subject: GC is very expensive: am I doing something wrong?
References: <9b25b816-20d9-410b-b881-ff51efa51a04@f8g2000yqn.googlegroups.com>
	<mailman.963.1268958842.23598.python-list@python.org>
	<ho6ai4$b12$2@lust.ihug.co.nz>
	<mailman.1060.1269243742.23598.python-list@python.org>
	<ho8v4q$a4q$2@news.eternal-september.org>
	<mailman.1076.1269310331.23598.python-list@python.org>
	<7xwrx3mxuj.fsf@ruckus.brouhaha.com>
	<mailman.1083.1269338807.23598.python-list@python.org>
	<7xpr2v2wd7.fsf@ruckus.brouhaha.com>
	<mailman.1090.1269363241.23598.python-list@python.org>
Message-ID: <7xaaty4hwa.fsf@ruckus.brouhaha.com>

Antoine Pitrou <solipsis at pitrou.net> writes:
>> See: http://www.cs.rice.edu/~scrosby/hash/ ...
> Certainly interesting in a purely academic point of view, but in real 
> life if you want to cause a denial of service by overwhelming a server, 
> there are far more obvious options than trying to guess the server's use 
> of hash tables and trying to cause lots of collisions in them.

If you look at the very low bandwidth used in some of those hashtable
attacks, it's hard to see any other somewhat-generic attack that's
comparably effective.  Usually we think of "DOS" as involving massive
botnets and the like, not a dribble of a few hundred characters per
second.


From vipshopper.us at hotmail.com  Tue Mar 23 21:53:31 2010
From: vipshopper.us at hotmail.com (marrylin)
Date: Tue, 23 Mar 2010 18:53:31 -0700 (PDT)
Subject: Hello,everybody,the good shoping place,the new year approaching, 
	click in. Let's facelift bar! ===== HTTP://loveshopping.us   ====
Message-ID: <e570198a-ade3-4cd1-bc81-a5a1a86501d1@h18g2000yqo.googlegroups.com>

Hello,everybody,the good shoping place,the new year approaching, click
in. Let's facelift bar!
===== HTTP://loveshopping.us   ====

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UGG BOOT $50

Nike shox(R4,NZ,OZ,TL1,TL2,TL3) $35

Handbags(Coach lv fendi d&g) $35

Tshirts (Polo ,ed hardy,lacoste) $16

Jean(True Religion,ed hardy,coogi) $30

Sunglasses(Oakey,coach,gucci,Armaini) $16

New era cap $15

Bikini (Ed hardy,polo) $25

FREE SHIPPING


From eire1130 at gmail.com  Tue Mar 23 22:51:48 2010
From: eire1130 at gmail.com (JR)
Date: Tue, 23 Mar 2010 19:51:48 -0700 (PDT)
Subject: 'gcc' failed with exit status 1
Message-ID: <8e68f9ea-7c99-4d52-90f3-0ea90b8f5c57@z3g2000yqz.googlegroups.com>

Hello All,

I was hoping I could get some help with this issue with getting Cython
to work. Earlier I had an issue that said "unable to find
vcvarsall.bat" and it turns out there is an active bug report that
covers that issue (I have a 64 bit windows system). I still hadn't
installed 3.1.2, so I did that tonight and now I have the issue below.
Any thoughts on what I am doing wrong?



Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\James>cd C:\Python31

C:\Python31>python setup.py build_ext --inplace
running build_ext
cythoning hello.pyx to hello.c

Error converting Pyrex file to C:
------------------------------------------------------------
...
def say_hello_to(name):
                      ^
------------------------------------------------------------

C:\Python31\hello.pyx:1:23: Unrecognized character
building 'hello' extension
C:\MinGW\bin\gcc.exe -mno-cygwin -mdll -O -Wall -IC:\Python31\include -
IC:\Pytho
n31\PC -c hello.c -o build\temp.win-amd64-3.1\Release\hello.o
hello.c:1:2: #error Do not use this file, it is the result of a failed
Cython co
mpilation.
error: command 'gcc' failed with exit status 1

C:\Python31>


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 24 00:41:01 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 24 Mar 2010 04:41:01 GMT
Subject: Unicode blues in Python3
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
	<mailman.1099.1269367884.23598.python-list@python.org>
	<3a428b39-bab1-48f2-b7df-560a849b8883@d27g2000yqf.googlegroups.com>
Message-ID: <pan.2010.03.24.04.41.02@REMOVE.THIS.cybersource.com.au>

On Tue, 23 Mar 2010 11:46:33 -0700, nn wrote:

> Actually what I want is to write a particular byte to standard output,
> and I want this to work regardless of where that output gets sent to.

What do you mean "work"?

Do you mean "display a particular glyph" or something else?

In bash:

$ echo -e "\0101"  # octal 101 = decimal 65
A
$ echo -e "\0375"  # decimal 253
?

but if I change the terminal encoding, I get this:

$ echo -e "\0375"
?

Or this:

$ echo -e "\0375"
?

depending on which encoding I use.

I think your question is malformed. You need to work out what behaviour 
you actually want, before you can ask for help on how to get it.



-- 
Steven


From stefan_ml at behnel.de  Wed Mar 24 02:48:58 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Wed, 24 Mar 2010 07:48:58 +0100
Subject: 'gcc' failed with exit status 1
In-Reply-To: <8e68f9ea-7c99-4d52-90f3-0ea90b8f5c57@z3g2000yqz.googlegroups.com>
References: <8e68f9ea-7c99-4d52-90f3-0ea90b8f5c57@z3g2000yqz.googlegroups.com>
Message-ID: <hocckq$dtv$1@dough.gmane.org>

JR, 24.03.2010 03:51:
> I was hoping I could get some help with this issue with getting Cython
> to work. Earlier I had an issue that said "unable to find
> vcvarsall.bat" and it turns out there is an active bug report that
> covers that issue (I have a 64 bit windows system). I still hadn't
> installed 3.1.2, so I did that tonight and now I have the issue below.
> Any thoughts on what I am doing wrong?
>
>
> Microsoft Windows [Version 6.1.7600]
> Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
>
> C:\Users\James>cd C:\Python31
>
> C:\Python31>python setup.py build_ext --inplace
> running build_ext
> cythoning hello.pyx to hello.c
>
> Error converting Pyrex file to C:
> ------------------------------------------------------------
> ...
> def say_hello_to(name):
>                        ^
> ------------------------------------------------------------
>
> C:\Python31\hello.pyx:1:23: Unrecognized character

Given that you're on Windows, this looks like a known bug in Cython:

http://trac.cython.org/cython_trac/ticket/520

This is due to the lack of universal newline support in the codecs module, 
which has been fixed in the new Py2.6+ 'io' module. A patch for Cython that 
switches to the new 'io' module and works around this issue in older Python 
versions is available:

http://hg.cython.org/cython-devel/raw-rev/751bdd38b55c

That being said, the simplest way to work around this issue is to switch to 
Unix line endings in your source file. Most editors support this without 
problems.

Stefan



From xenoszh at gmail.com  Wed Mar 24 03:23:39 2010
From: xenoszh at gmail.com (Parker)
Date: Wed, 24 Mar 2010 00:23:39 -0700 (PDT)
Subject: Python is cool!!
References: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
Message-ID: <a0b16b2b-ec03-433e-b37b-5bc33ca2f15e@t23g2000yqt.googlegroups.com>

On Mar 23, 4:55?pm, Jose Manuel <jfernan... at gmail.com> wrote:
> I have been learning Python, and it is amazing .... I am using the
> tutorial that comes with the official distribution.
>
> At the end my goal is to develop applied mathematic in engineering
> applications to be published on the Web, specially on app. oriented to
> simulations and control systems, I was about to start learning Java
> but I found Python which seems easier to learn that Java.
>
> Would it be easy to integrate Python in Web pages with HTML? I have
> read many info on Internet saying it is, and I hope so ....
>
> Any opinion

this must be the one you want
http://web2py.com/


From stef.mientki at gmail.com  Wed Mar 24 03:52:02 2010
From: stef.mientki at gmail.com (Stef Mientki)
Date: Wed, 24 Mar 2010 08:52:02 +0100
Subject: Python is cool!!
In-Reply-To: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
References: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
Message-ID: <4BA9C4A2.40100@gmail.com>

On 23-03-2010 17:55, Jose Manuel wrote:
> I have been learning Python, and it is amazing .... I am using the
> tutorial that comes with the official distribution.
>
> At the end my goal is to develop applied mathematic in engineering
> applications to be published on the Web, specially on app. oriented to
> simulations and control systems, I was about to start learning Java
> but I found Python which seems easier to learn that Java.
>
> Would it be easy to integrate Python in Web pages with HTML? I have
> read many info on Internet saying it is, and I hope so ....
>
> Any opinion
>    
you might take a look at http://www.sagemath.org/
cheers,
Stef
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From gagsl-py2 at yahoo.com.ar  Wed Mar 24 04:03:46 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 24 Mar 2010 05:03:46 -0300
Subject: Castrated traceback in sys.exc_info()
References: <7866674b-46ba-49e2-9d76-e8259ba22df0@z3g2000yqz.googlegroups.com>
	<20100317124019.7013dfa3@moriz.interne>
	<9fd96c3b1003170542t4ea864c6y359107cb747536da@mail.gmail.com>
	<op.u9uflwxxx6zn5v@lepton.softlabbsas.com.ar>
	<4BA7B4F7.6080404@wanadoo.fr>
	<op.u90bjsorx6zn5v@lepton.softlabbsas.com.ar>
	<mailman.1105.1269377396.23598.python-list@python.org>
	<0301d0b5-5d5d-436f-a342-16fe81b340d7@t41g2000yqt.googlegroups.com>
Message-ID: <op.u92bckfox6zn5v@gabriel.sleipnir-bsas>

En Tue, 23 Mar 2010 19:43:40 -0300, Vinay Sajip <vinay_sajip at yahoo.co.uk>  
escribi?:
> On Mar 23, 8:49 pm, Pascal Chambon <chambon.pas... at wanadoo.fr> wrote:
>>
>> Should I open an issue for this evolution of exceptiuon handling, or
>> should we content ourselves of this "hacking" of frame stck ?
>
> Possibly worth raising an issue (not logging-related), but perhaps
> it's worth seeing if this has come up before creating the issue.

There is, from 2006: http://bugs.python.org/issue1553375
I'll add a patch+tests to this issue.

-- 
Gabriel Genellina



From joho.smithury at gmail.com  Wed Mar 24 05:07:26 2010
From: joho.smithury at gmail.com (John Smithury)
Date: Wed, 24 Mar 2010 17:07:26 +0800
Subject: Where can i reference the "regular expressions"
Message-ID: <baf5916c1003240207keac00ebl1cb63ca5452fc43a@mail.gmail.com>

Dear pythoners,

I'm a new member to studay the python, i wan't to studay the "regular
expressions" handle like below:

==============source============
<line>the</line>
<line>is</line>
<line>name</line>
==============source end=========


after convert, the result like below:

-------------------------result------------------------
{'t','t','e'},
{'i','s'},
{'n','a','m','e'}
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From andreengels at gmail.com  Wed Mar 24 05:18:14 2010
From: andreengels at gmail.com (Andre Engels)
Date: Wed, 24 Mar 2010 10:18:14 +0100
Subject: Where can i reference the "regular expressions"
In-Reply-To: <baf5916c1003240207keac00ebl1cb63ca5452fc43a@mail.gmail.com>
References: <baf5916c1003240207keac00ebl1cb63ca5452fc43a@mail.gmail.com>
Message-ID: <6faf39c91003240218x770290c3l8c70ea5c3e70f6ac@mail.gmail.com>

On Wed, Mar 24, 2010 at 10:07 AM, John Smithury <joho.smithury at gmail.com> wrote:
> Dear pythoners,
>
> I'm a new member to studay the python, i wan't to studay the "regular
> expressions" handle like below:
>
> ==============source============
> <line>the</line>
> <line>is</line>
> <line>name</line>
> ==============source end=========
>
>
> after convert, the result like below:
>
> -------------------------result------------------------
> {'t','t','e'},
> {'i','s'},
> {'n','a','m','e'}

What did you think of yourself, and where did you get into the "I
don't know what to do now" place? Why do you think your problem would
have to do with regular expressions?



-- 
Andr? Engels, andreengels at gmail.com


From __peter__ at web.de  Wed Mar 24 05:34:31 2010
From: __peter__ at web.de (Peter Otten)
Date: Wed, 24 Mar 2010 10:34:31 +0100
Subject: logging: local functions ==> loss of lineno
References: <mailman.576.1268256192.23598.python-list@python.org>
	<hnaj9c$i0u$02$1@news.t-online.com>
	<4BA295A1.70207@hellmutweber.de>
	<mailman.972.1268995215.23598.python-list@python.org>
	<hnvqe5$vc$02$1@news.t-online.com>
	<mailman.977.1269006574.23598.python-list@python.org>
	<ho21dt$b6v$00$1@news.t-online.com>
	<d35c950b-c6e5-4162-8175-3e0a0255c71a@30g2000yqi.googlegroups.com>
Message-ID: <hocmak$ap$00$1@news.t-online.com>

Vinay Sajip wrote:

> Sorry I'm a little late to this discussion. I could add a _findCaller
> function to the module (not part of the public API, but replaceable by
> someone who really needs to) which does the heavy lifting, and
> Logger.findCaller just calls it. Then those who need to can implement
> their own strategy, without needing to jump through hoops. Does that
> approach sound helpful?

You mean you'd have to monkey-patch logging._findCaller() instead of 
overriding logging.Logger.findCaller()? 

I don't see a big advantage in that.

Here's an alternative proposal: simplify findCaller() by moving part of the 
code into a generator:

    def callers(self):
        """
        Walk up the call stack.
        Helper for findCaller().
        """
        f = currentframe()
        #On some versions of IronPython, currentframe() returns None if
        #IronPython isn't run with -X:Frames.
        if f is not None:
            f = f.f_back
        while hasattr(f, "f_code"):
            co = f.f_code
            filename = os.path.normcase(co.co_filename)
            yield filename, f.f_lineno, co.co_name
            f = f.f_back
    
    
    def findCaller(self):
        """
        Find the stack frame of the caller so that we can note the source
        file name, line number and function name.
        """
        for filename, lineno, funcname in self.callers():
            if filename != _srcfile:
                return filename, lineno, funcname
        return UNKNOWN_CALLER

Another simplification might be to have setLoggerClass() implicitly set the 
root logger and to drop the distinct RootLogger class completely. 

Note that I have no strong opinion on all this. If you leave things as is 
I'm fine with that.

Peter


From mail at timgolden.me.uk  Wed Mar 24 05:41:00 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 24 Mar 2010 09:41:00 +0000
Subject: using message loop for hotkey capturing
In-Reply-To: <bc7f680c1003231001rfeb6f33ve4d04d36d32e737a@mail.gmail.com>
References: <bc7f680c1003231001rfeb6f33ve4d04d36d32e737a@mail.gmail.com>
Message-ID: <4BA9DE2C.6060307@timgolden.me.uk>

On 23/03/2010 17:01, Alex Hall wrote:
> Hi all, but mainly Tim Golden:
> Tim, I am using your wonderful message loop for keyboard input, the
> one on your site that you pointed me to a few months ago. It has been
> working perfectly as long as I had only one dictionary of keys mapping
> to one dictionary of functions, but now I want two of each. My program
> has different modes, which may have varying keystrokes, and I also
> have some global keystrokes which are the same across all modes, like
> exiting or switching modes. I cannot figure out how to make the
> message loop look in two dictionaries at onc. I tried using an if,
> saying that if action_to_take was not set in the mode-specific
> dictionary then look at the global dictionary, but it is like it is
> never looking in the global dictionary at all. I get no syntax errors
> or problems when running the program, so it has to be something in my
> logic.

There's definitely some confusion, as MRAB picked up, with the
globalkeys / globalfuncs thing. I can see no problem with simply
defining an additional pair of dictionaries parallel with each of
the keys/funcs dictionaries (note that the numbers are different
from those of othe other dictionaries as these are the registration
ids of the hotkeys):

global_keys = {
   100: (68, win32com.MOD_ALT | win32con.MOD_CONTROL ...),
   ...
}

global_funcs = {
   100 : dict.ShowLookupDialog,
   ...
}

Then your central action code could be something like:

   action_to_take = global_funcs.get (msg.wParam) or HOTKEY_ACTIONS.get (msg.wParam)
   if action_to_take:
     action_to_take ()

This assumes that the funcs dictionaries will only ever contain a
valid function, so the only possible Falsish value will arise from
the get returning None.

TJG

BTW, you're shadowing a couple of builtins: global & dict which
might give you problems later if you needed them. There are other
issues with the structure of your code but nothing a little
refactoring couldn't sort out if you felt so inclined.


From andreengels at gmail.com  Wed Mar 24 05:50:37 2010
From: andreengels at gmail.com (Andre Engels)
Date: Wed, 24 Mar 2010 10:50:37 +0100
Subject: Where can i reference the "regular expressions"
In-Reply-To: <baf5916c1003240234u5c207d34l193d6560068162c@mail.gmail.com>
References: <baf5916c1003240207keac00ebl1cb63ca5452fc43a@mail.gmail.com> 
	<6faf39c91003240218x770290c3l8c70ea5c3e70f6ac@mail.gmail.com> 
	<baf5916c1003240234u5c207d34l193d6560068162c@mail.gmail.com>
Message-ID: <6faf39c91003240250p3327c795k6544ad089a96c464@mail.gmail.com>

On Wed, Mar 24, 2010 at 10:34 AM, John Smithury <joho.smithury at gmail.com> wrote:
> ==============source============
> <line>the</line>
> <line>is</line>
> <line>name</line>
> ==============source end=========
>
> First, get the word only(discard the "<line>" and "</line>"), it can use
> regular expression, right?
>
> the
> is
> name
> Second, get a charactor in each word and compose like format {'t','h','e'}
>>>>for a in line
>
>
> Most import is learning the "regular expressions" var this example.

Okay, then I'll go into that part.

regex = re.compile("<line>([^<>]*)</line>")

[^<>] here means "any character but < or >"
* means that we have any number (zero or more) of such characters
The brackets mean that this is the part of the expression we are
interested in (the group)
The expression as a whole thus means:
First <line>, then the part we are interested in, which is a random
string of things that are not < or >, then </line>

To use this expression (assuming 'text' is the string you want to check:

result = regex.findall(text)

will find all occurences of the regular expression, and provide you
with the content of the group.


-- 
Andr? Engels, andreengels at gmail.com


From jeanmichel at sequans.com  Wed Mar 24 06:37:17 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Wed, 24 Mar 2010 11:37:17 +0100
Subject: logging: local functions ==> loss of lineno
In-Reply-To: <hocmak$ap$00$1@news.t-online.com>
References: <mailman.576.1268256192.23598.python-list@python.org>	<hnaj9c$i0u$02$1@news.t-online.com>	<4BA295A1.70207@hellmutweber.de>	<mailman.972.1268995215.23598.python-list@python.org>	<hnvqe5$vc$02$1@news.t-online.com>	<mailman.977.1269006574.23598.python-list@python.org>	<ho21dt$b6v$00$1@news.t-online.com>	<d35c950b-c6e5-4162-8175-3e0a0255c71a@30g2000yqi.googlegroups.com>
	<hocmak$ap$00$1@news.t-online.com>
Message-ID: <4BA9EB5D.5050003@sequans.com>

Peter Otten wrote:
> Vinay Sajip wrote:
>
>   
>> Sorry I'm a little late to this discussion. I could add a _findCaller
>> function to the module (not part of the public API, but replaceable by
>> someone who really needs to) which does the heavy lifting, and
>> Logger.findCaller just calls it. Then those who need to can implement
>> their own strategy, without needing to jump through hoops. Does that
>> approach sound helpful?
>>     
>
> [snip] 
>
> Note that I have no strong opinion on all this. If you leave things as is 
> I'm fine with that.
>
> Peter
>   
Agreed, I'm not sure it's worth the effort Vinay.

JM



From mehgcap at gmail.com  Wed Mar 24 06:43:24 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Wed, 24 Mar 2010 06:43:24 -0400
Subject: exiting threaded program?
Message-ID: <bc7f680c1003240343w775fec8g8cc190bb921bac2d@mail.gmail.com>

Hi all,
I have a program with a timer in it, therefore I have multiple
threads. My method of exiting by using "user32.PostQuitMessage (0)" no
longer seems to be doing the job since I added the timer. What else do
I have to do to close my program? I say it is not closing because,
before, I would be returned to a prompt in the cmd line, but now I
cannot type in the cmd line window even after the program supposedly
closes, whereas before I could have. Thanks.

-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From vinay_sajip at yahoo.co.uk  Wed Mar 24 06:45:32 2010
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Wed, 24 Mar 2010 03:45:32 -0700 (PDT)
Subject: logging: local functions ==> loss of lineno
References: <mailman.576.1268256192.23598.python-list@python.org> 
	<hnaj9c$i0u$02$1@news.t-online.com> <4BA295A1.70207@hellmutweber.de> 
	<mailman.972.1268995215.23598.python-list@python.org>
	<hnvqe5$vc$02$1@news.t-online.com> 
	<mailman.977.1269006574.23598.python-list@python.org>
	<ho21dt$b6v$00$1@news.t-online.com> 
	<d35c950b-c6e5-4162-8175-3e0a0255c71a@30g2000yqi.googlegroups.com> 
	<hocmak$ap$00$1@news.t-online.com>
Message-ID: <b02720d8-a1b5-4133-a018-b3dd613be8e3@q21g2000yqm.googlegroups.com>

On Mar 24, 9:34?am, Peter Otten <__pete... at web.de> wrote:
>
> You mean you'd have to monkey-patchlogging._findCaller() instead of
> overridinglogging.Logger.findCaller()?
>
> I don't see a big advantage in that.
>

Only that you just have to replace a function, and not have to
subclass Logger + override findCaller. And it's not especially monkey-
patching if the function is put there specifically to be replaced when
needed :-)

> Another simplification might be to have setLoggerClass() implicitly set the
> root logger and to drop the distinct RootLogger class completely.

I can't remember now why I created a separate class for the root - I
thought it might have some specialization which never happened. Of
course, I'm not sure if anyone is using it, so I can't just get rid of
it. Anyway, the root logger is in some sense special so it might be
more useful in the future.

> Note that I have no strong opinion on all this. If you leave things as is
> I'm fine with that.

Yes, it's hardly a common case that the OP is mentioning. AFAIK this
is the first time it's come up. I just thought from your and Jean-
Michel's solutions that there might be a need felt by more people to
have this functionality be more flexible.

Regards,

Vinay Sajip


From mehgcap at gmail.com  Wed Mar 24 06:48:21 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Wed, 24 Mar 2010 06:48:21 -0400
Subject: using message loop for hotkey capturing
In-Reply-To: <4BA9DE2C.6060307@timgolden.me.uk>
References: <bc7f680c1003231001rfeb6f33ve4d04d36d32e737a@mail.gmail.com>
	<4BA9DE2C.6060307@timgolden.me.uk>
Message-ID: <bc7f680c1003240348paad9c5cj6104935a4617393c@mail.gmail.com>

Thanks, it seems to be working for now... Hopefully that trend continues!

On 3/24/10, Tim Golden <mail at timgolden.me.uk> wrote:
> On 23/03/2010 17:01, Alex Hall wrote:
>> Hi all, but mainly Tim Golden:
>> Tim, I am using your wonderful message loop for keyboard input, the
>> one on your site that you pointed me to a few months ago. It has been
>> working perfectly as long as I had only one dictionary of keys mapping
>> to one dictionary of functions, but now I want two of each. My program
>> has different modes, which may have varying keystrokes, and I also
>> have some global keystrokes which are the same across all modes, like
>> exiting or switching modes. I cannot figure out how to make the
>> message loop look in two dictionaries at onc. I tried using an if,
>> saying that if action_to_take was not set in the mode-specific
>> dictionary then look at the global dictionary, but it is like it is
>> never looking in the global dictionary at all. I get no syntax errors
>> or problems when running the program, so it has to be something in my
>> logic.
>
> There's definitely some confusion, as MRAB picked up, with the
> globalkeys / globalfuncs thing. I can see no problem with simply
> defining an additional pair of dictionaries parallel with each of
> the keys/funcs dictionaries (note that the numbers are different
> from those of othe other dictionaries as these are the registration
> ids of the hotkeys):
>
> global_keys = {
>    100: (68, win32com.MOD_ALT | win32con.MOD_CONTROL ...),
>    ...
> }
>
> global_funcs = {
>    100 : dict.ShowLookupDialog,
>    ...
> }
>
> Then your central action code could be something like:
>
>    action_to_take = global_funcs.get (msg.wParam) or HOTKEY_ACTIONS.get
> (msg.wParam)
>    if action_to_take:
>      action_to_take ()
>
> This assumes that the funcs dictionaries will only ever contain a
> valid function, so the only possible Falsish value will arise from
> the get returning None.
>
> TJG
>
> BTW, you're shadowing a couple of builtins: global & dict which
> might give you problems later if you needed them. There are other
> issues with the structure of your code but nothing a little
> refactoring couldn't sort out if you felt so inclined.
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From mail at timgolden.me.uk  Wed Mar 24 06:48:55 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 24 Mar 2010 10:48:55 +0000
Subject: exiting threaded program?
In-Reply-To: <bc7f680c1003240343w775fec8g8cc190bb921bac2d@mail.gmail.com>
References: <bc7f680c1003240343w775fec8g8cc190bb921bac2d@mail.gmail.com>
Message-ID: <4BA9EE17.4050606@timgolden.me.uk>

On 24/03/2010 10:43, Alex Hall wrote:
> Hi all,
> I have a program with a timer in it, therefore I have multiple
> threads. My method of exiting by using "user32.PostQuitMessage (0)" no
> longer seems to be doing the job since I added the timer. What else do
> I have to do to close my program? I say it is not closing because,
> before, I would be returned to a prompt in the cmd line, but now I
> cannot type in the cmd line window even after the program supposedly
> closes, whereas before I could have. Thanks.
>

Make the timer thread a daemon?

TJG


From alfps at start.no  Wed Mar 24 06:55:34 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 24 Mar 2010 11:55:34 +0100
Subject: exiting threaded program?
In-Reply-To: <mailman.1125.1269427406.23598.python-list@python.org>
References: <mailman.1125.1269427406.23598.python-list@python.org>
Message-ID: <hocqvd$rct$1@news.eternal-september.org>

* Alex Hall:
> Hi all,
> I have a program with a timer in it, therefore I have multiple
> threads.

Is the "therefore..." an inference or independendent information?

If it is an inference then it may not be correct.

For example, timers in a GUI program need not involve additional threads.


> My method of exiting by using "user32.PostQuitMessage (0)"

This sounds like the Windows API level accessed from Python, not Python level?

At the Windows API level, as I recall PostQuitMessage results in a WM_QUIT 
posted to the current thread's message queue, where it'll be processed by this 
thread's message loop, if it has one, which will then ideally finish.

Possibly, if you indeed have more than one thread, you're posting the WM_QUIT to 
the wrong thread  --  to quit the app it needs to be posted to the main thread.


> no
> longer seems to be doing the job since I added the timer. What else do
> I have to do to close my program? I say it is not closing because,
> before, I would be returned to a prompt in the cmd line, but now I
> cannot type in the cmd line window even after the program supposedly
> closes, whereas before I could have. Thanks.

Try to reduce the problem to a minimal complete program, and post that?

Unless the above comments help?


Cheers,

- Alf


From mehgcap at gmail.com  Wed Mar 24 07:04:40 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Wed, 24 Mar 2010 07:04:40 -0400
Subject: exiting threaded program?
In-Reply-To: <4BA9EE17.4050606@timgolden.me.uk>
References: <bc7f680c1003240343w775fec8g8cc190bb921bac2d@mail.gmail.com>
	<4BA9EE17.4050606@timgolden.me.uk>
Message-ID: <bc7f680c1003240404q5f0df9f8q805ca41e1907250b@mail.gmail.com>

A daemon... Good idea, and that makes more sense for what the thread
does anyway; it is just a timer, updating a variable by contacting a
server every hour. By the way, just what is the difference between
user32.PostQuitMessage (0) and sys.exit()?


On 3/24/10, Tim Golden <mail at timgolden.me.uk> wrote:
> On 24/03/2010 10:43, Alex Hall wrote:
>> Hi all,
>> I have a program with a timer in it, therefore I have multiple
>> threads. My method of exiting by using "user32.PostQuitMessage (0)" no
>> longer seems to be doing the job since I added the timer. What else do
>> I have to do to close my program? I say it is not closing because,
>> before, I would be returned to a prompt in the cmd line, but now I
>> cannot type in the cmd line window even after the program supposedly
>> closes, whereas before I could have. Thanks.
>>
>
> Make the timer thread a daemon?
>
> TJG
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From mail at timgolden.me.uk  Wed Mar 24 07:08:06 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 24 Mar 2010 11:08:06 +0000
Subject: exiting threaded program?
In-Reply-To: <bc7f680c1003240404q5f0df9f8q805ca41e1907250b@mail.gmail.com>
References: <bc7f680c1003240343w775fec8g8cc190bb921bac2d@mail.gmail.com>	
	<4BA9EE17.4050606@timgolden.me.uk>
	<bc7f680c1003240404q5f0df9f8q805ca41e1907250b@mail.gmail.com>
Message-ID: <4BA9F296.4010504@timgolden.me.uk>

On 24/03/2010 11:04, Alex Hall wrote:
> A daemon... Good idea, and that makes more sense for what the thread
> does anyway; it is just a timer, updating a variable by contacting a
> server every hour. By the way, just what is the difference between
> user32.PostQuitMessage (0) and sys.exit()?

The former is a notification to a Windows message loop (something
most Python programs don't have) that it should exit; the latter
is a system call to exit the running program -- after any message
loops have completed if applicable.

BTW if you're running a Windows message loop anyway, you could just
use Windows timers, catch the WM_TIMER message and avoid the complication
of threads. Just an idea.

TJG


From info at egenix.com  Wed Mar 24 08:36:39 2010
From: info at egenix.com (eGenix Team: M.-A. Lemburg)
Date: Wed, 24 Mar 2010 13:36:39 +0100
Subject: ANN: eGenix mxODBC Zope Database Adapter 2.0.0
Message-ID: <4BAA0757.5050701@egenix.com>

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                            Version 2.0.0

                     for Zope and the Plone CMS

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        Windows, Linux, Mac OS X, FreeBSD and other platforms

This announcement is also available on our web-site for online reading:
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Mac OS X, FreeBSD and other platforms.

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environments where stability and high performance are a top priority,
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________________________________________________________________________
NEWS

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               http://www.egenix.com/company/contact/


From pruebauno at latinmail.com  Wed Mar 24 09:03:31 2010
From: pruebauno at latinmail.com (nn)
Date: Wed, 24 Mar 2010 06:03:31 -0700 (PDT)
Subject: Unicode blues in Python3
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
	<mailman.1099.1269367884.23598.python-list@python.org>
	<3a428b39-bab1-48f2-b7df-560a849b8883@d27g2000yqf.googlegroups.com>
	<mailman.1101.1269374267.23598.python-list@python.org>
	<c75d1abb-2674-4c67-9701-38946b5db58f@l25g2000yqd.googlegroups.com>
	<4BA943E7.5000202@v.loewis.de>
Message-ID: <0250ffe0-0bb0-4cb2-8c3e-6446fb51b0b8@r27g2000yqn.googlegroups.com>



Martin v. Loewis wrote:
> nn wrote:
> >
> > Stefan Behnel wrote:
> >> nn, 23.03.2010 19:46:
> >>> Actually what I want is to write a particular byte to standard output,
> >>> and I want this to work regardless of where that output gets sent to.
> >>> I am aware that I could do
> >>> open('nnout','w',encoding='latin1').write(mychar) but I am porting a
> >>> python2 program and don't want to rewrite everything that uses that
> >>> script.
> >> Are you writing text or binary data to stdout?
> >>
> >> Stefan
> >
> > latin1 charset text.
>
> Are you sure about that? If you carefully reconsider, could you come to
> the conclusion that you are not writing text at all, but binary data?
>
> If it really was text that you write, why do you need to use
> U+00FD (LATIN SMALL LETTER Y WITH ACUTE). To my knowledge, that
> character is really infrequently used in practice. So that you try to
> write it strongly suggests that it is not actually text what you are
> writing.
>
> Also, your formulation suggests the same:
>
> "Is there any way to write a value 253 to standard output?"
>
> If you would really be writing text, you'd ask
>
>
> "Is there any way to write '?' to standard output?"
>
> Regards,
> Martin

To be more informative I am both writing text and binary data
together. That is I am embedding text from another source into stream
that uses non-ascii characters as "control" characters. In Python2 I
was processing it mostly as text containing a few "funny" characters.


From pruebauno at latinmail.com  Wed Mar 24 09:08:26 2010
From: pruebauno at latinmail.com (nn)
Date: Wed, 24 Mar 2010 06:08:26 -0700 (PDT)
Subject: Unicode blues in Python3
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
	<mailman.1099.1269367884.23598.python-list@python.org>
	<3a428b39-bab1-48f2-b7df-560a849b8883@d27g2000yqf.googlegroups.com>
	<pan.2010.03.24.04.41.02@REMOVE.THIS.cybersource.com.au>
Message-ID: <5db21794-371b-42eb-8c08-06395149faea@y17g2000yqd.googlegroups.com>



Steven D'Aprano wrote:
> On Tue, 23 Mar 2010 11:46:33 -0700, nn wrote:
>
> > Actually what I want is to write a particular byte to standard output,
> > and I want this to work regardless of where that output gets sent to.
>
> What do you mean "work"?
>
> Do you mean "display a particular glyph" or something else?
>
> In bash:
>
> $ echo -e "\0101"  # octal 101 = decimal 65
> A
> $ echo -e "\0375"  # decimal 253
> ?
>
> but if I change the terminal encoding, I get this:
>
> $ echo -e "\0375"
> ?
>
> Or this:
>
> $ echo -e "\0375"
> ?
>
> depending on which encoding I use.
>
> I think your question is malformed. You need to work out what behaviour
> you actually want, before you can ask for help on how to get it.
>
>
>
> --
> Steven

Yes sorry it is a bit ambiguous. I don't really care what glyph is,
the program reading my output reads 8 bit values expects the binary
value 0xFD as control character and lets everything else through as is.


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From solipsis at pitrou.net  Wed Mar 24 09:41:11 2010
From: solipsis at pitrou.net (Antoine Pitrou)
Date: Wed, 24 Mar 2010 13:41:11 +0000 (UTC)
Subject: Unicode blues in Python3
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
Message-ID: <hod4pn$tks$1@dough.gmane.org>

Le Tue, 23 Mar 2010 10:33:33 -0700, nn a ?crit?:

> I know that unicode is the way to go in Python 3.1, but it is getting in
> my way right now in my Unix scripts. How do I write a chr(253) to a
> file?
> 
> #nntst2.py
> import sys,codecs
> mychar=chr(253)
> print(sys.stdout.encoding)
> print(mychar)

print() writes to the text (unicode) layer of sys.stdout.
If you want to access the binary (bytes) layer, you must use 
sys.stdout.buffer. So:

  sys.stdout.buffer.write(chr(253).encode('latin1'))

or:

  sys.stdout.buffer.write(bytes([253]))

See http://docs.python.org/py3k/library/io.html#io.TextIOBase.buffer




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From hv at tbz-pariv.de  Wed Mar 24 10:29:03 2010
From: hv at tbz-pariv.de (Thomas Guettler)
Date: Wed, 24 Mar 2010 15:29:03 +0100
Subject: crypto: verify external pkcs7 signature
Message-ID: <80ulu3Fg0jU1@mid.individual.net>

Hi,

some black box system gives me secKey.pkcs7 signature and
a data file. The signature should be correct, but it fails.


On newer system I get this: M2Crypto.SMIME.PKCS7_Error: digest failure

on older systems (openssl-0.9.8h-28.10.1) I get PKCS7 routines:PKCS7_verify:signature failure:pk7_smime.c:312

On a system with openssl-0.9.8e-45.13 the script creates a core dump.

Any hints?

{{{
def verify(file):
    s = SMIME.SMIME()
    cert_file='CN=NW4.cert'
    x509=X509.load_cert(cert_file)
    sk=X509.X509_Stack()
    sk.push(x509)
    s.set_x509_stack(sk)

    # Load the signer's CA cert. In this case, because the signer's
    # cert is self-signed, it is the signer's cert itself.

    st = X509.X509_Store()
    st.load_info(cert_file)  # CA Cert
    s.set_x509_store(st)
    from M2Crypto.BIO import File

    # Load the data, verify it.
    p7=SMIME.load_pkcs7('secKey.pkcs7')
    try:
        print s.verify(p7, File(open(file)))
    except (M2Crypto.SMIME.PKCS7_Error, M2Crypto.SMIME.SMIME_Error), exc:
        print '%s failed: %s' % (file, str(exc).strip())
        return False
    return True
}}}


-- 
Thomas Guettler, http://www.thomas-guettler.de/
E-Mail: guettli (*) thomas-guettler + de


From python at bdurham.com  Wed Mar 24 10:52:40 2010
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 24 Mar 2010 10:52:40 -0400
Subject: Sniffing encoding type by looking at file BOM header
Message-ID: <1269442360.3213.1366489361@webmail.messagingengine.com>

I assume there's no standard library function that wraps
codecs.open() to sniff a file's BOM header and open the file with
the appropriate encoding?

My reading of the docs leads me to believe that there are 5 
types of possible BOM headers with multiple names (synoymns?)
for the same BOM encoding type.

BOM          = '\xff\xfe'
BOM_LE       = '\xff\xfe'
BOM_UTF16    = '\xff\xfe'
BOM_UTF16_LE = '\xff\xfe'

BOM_BE       = '\xfe\xff'
BOM32_BE     = '\xfe\xff'
BOM_UTF16_BE = '\xfe\xff'

BOM64_BE     = '\x00\x00\xfe\xff'
BOM_UTF32_BE = '\x00\x00\xfe\xff'

BOM64_LE     = '\xff\xfe\x00\x00'
BOM_UTF32    = '\xff\xfe\x00\x00'
BOM_UTF32_LE = '\xff\xfe\x00\x00'

BOM_UTF8     = '\xef\xbb\xbf'

Is the process of writing a BOM sniffer readlly as simple 
as detecting one of these 5 header types and then calling 
codecs.open() with the appropriate encoding= parameter?

Note: I'm only interested in Unicode encodings. I am not
interested in any of the non-Unicode encodings supported 
by the codecs module.

Thank you,
Malcolm


From googler.1.webmaster at spamgourmet.com  Wed Mar 24 11:09:27 2010
From: googler.1.webmaster at spamgourmet.com (moerchendiser2k3)
Date: Wed, 24 Mar 2010 08:09:27 -0700 (PDT)
Subject: C-API: Extract information from function object
Message-ID: <b7632ea7-5523-4419-bc6b-b07bb2e6a443@g19g2000yqe.googlegroups.com>

Hi,

I have a reference to a function and would like to know how to extract
information from a function object.

Information I am looking for: line and file where this function is
from.

PyObject_Call can do this to when I call a function object and
something failed so these information are written to the traceback. So
any suggestions how to do that?

Thx!! moerchendiser2k3


From anand.shashwat at gmail.com  Wed Mar 24 11:17:12 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Wed, 24 Mar 2010 20:47:12 +0530
Subject: spams
Message-ID: <d4ab53de1003240817n32427eb1wcefb0128637ae5e5@mail.gmail.com>

Lately this list have been spammed a lot. Any workarounds by moderators?

~l0nwlf
-------------- next part --------------
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From yoavglazner at gmail.com  Wed Mar 24 11:27:38 2010
From: yoavglazner at gmail.com (Glazner)
Date: Wed, 24 Mar 2010 08:27:38 -0700 (PDT)
Subject: Advice needed on parallel processing in python
Message-ID: <0a050a71-8ff1-4393-aba9-9115eb38cbec@q21g2000yqm.googlegroups.com>

Hi!

I need to replace an app that does number crunching over a local
network.
it have about 50 computers as slaves
each computer needs to run COM that will do the "job"
right now the system uses MFC threads and DCOM to distribute the load.

as i said, Now i'm trying to replace this system with python.
I already use win32all and read about Pareller Python and Pyro.

a requirement is that messages can be sent to the remote worker.

If anyone can share experience I'll love to hear


Many Thanks,
Yoav Glazner


From no.email at please.post  Wed Mar 24 11:29:07 2010
From: no.email at please.post (kj)
Date: Wed, 24 Mar 2010 15:29:07 +0000 (UTC)
Subject: sum for sequences?
Message-ID: <hodb43$pt$1@reader1.panix.com>



Is there a sequence-oriented equivalent to the sum built-in?  E.g.:

  seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)

?

(By "sequence" I'm referring primarily to lists and tuples, and
excluding strings, since for these there is ''.join()).

TIA!

~K


From yoavglazner at gmail.com  Wed Mar 24 11:39:10 2010
From: yoavglazner at gmail.com (Glazner)
Date: Wed, 24 Mar 2010 08:39:10 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
Message-ID: <f3834509-02f0-472a-b71c-ea6ffdd74c77@q16g2000yqq.googlegroups.com>

On Mar 24, 5:29?pm, kj <no.em... at please.post> wrote:
> Is there a sequence-oriented equivalent to the sum built-in? ?E.g.:
>
> ? seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)
>
> ?
>
> (By "sequence" I'm referring primarily to lists and tuples, and
> excluding strings, since for these there is ''.join()).
>
> TIA!
>
> ~K

try itertools.chain


From neilc at norwich.edu  Wed Mar 24 11:42:02 2010
From: neilc at norwich.edu (Neil Cerutti)
Date: 24 Mar 2010 15:42:02 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
Message-ID: <80uq6aF6i4U1@mid.individual.net>

On 2010-03-24, kj <no.email at please.post> wrote:
>
>
> Is there a sequence-oriented equivalent to the sum built-in?  E.g.:
>
>   seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)
>
> ?
>
> (By "sequence" I'm referring primarily to lists and tuples, and
> excluding strings, since for these there is ''.join()).

reduce, or functools.reduce in Python 3.1.

>>> functools.reduce(operator.add, ((1, 2), (5, 6)))
(1, 2, 5, 6)

-- 
Neil Cerutti
"It's not fun to build walls. But it's even less fun to live
without walls in a world full of zombies." --Greedy Goblin


From insomnia.iit.roorkee at gmail.com  Wed Mar 24 11:42:44 2010
From: insomnia.iit.roorkee at gmail.com (insomnia iit roookee)
Date: Wed, 24 Mar 2010 08:42:44 -0700 (PDT)
Subject: coding contest
Message-ID: <da55efd6-877d-4579-b626-242b1425b4f8@s20g2000prm.googlegroups.com>

 IIT ROORKEE COGNIZANCE presents INSOMNIA :THE MIDNIGHT PROGRAMMING
CONTEST...
 www.insomnia.cognizance.org.in

  Starts on : 27th March, 9:00 PM

Cash prizes worth Rs.30,000 on stake for this round.
(PS: Problems of previous rounds are available for practice.)


From darcy at druid.net  Wed Mar 24 11:42:51 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Wed, 24 Mar 2010 11:42:51 -0400
Subject: spams
In-Reply-To: <d4ab53de1003240817n32427eb1wcefb0128637ae5e5@mail.gmail.com>
References: <d4ab53de1003240817n32427eb1wcefb0128637ae5e5@mail.gmail.com>
Message-ID: <20100324114251.ac0714c8.darcy@druid.net>

On Wed, 24 Mar 2010 20:47:12 +0530
Shashwat Anand <anand.shashwat at gmail.com> wrote:
> Lately this list have been spammed a lot. Any workarounds by moderators?

Not as long as it is gatewayed to Usenet.  You can kill most of the
spam by blocking anything from gmail.com with a Newsgroups line.
Unfortunately you will also block a lot of legitimate postings.

If they would turn off the gateway then legitimate posters can choose
to join the list but as long as the gateway is there then there is no
reason to switch.

With the gateway off there are all sorts of tools to reduce spam.  I
think the best one is to set the flag to only allow subscribers to post
and to start all new users as moderated and remove the moderation on
the first posting as long as it is not spam.  If the first posting is
not spam then chances are none of the rest from that user will be spam.

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


From steve at holdenweb.com  Wed Mar 24 11:42:52 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 24 Mar 2010 11:42:52 -0400
Subject: sum for sequences?
In-Reply-To: <hodb43$pt$1@reader1.panix.com>
References: <hodb43$pt$1@reader1.panix.com>
Message-ID: <hodbu9$vdn$1@dough.gmane.org>

kj wrote:
> 
> Is there a sequence-oriented equivalent to the sum built-in?  E.g.:
> 
>   seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)
> 
> ?
> 
> (By "sequence" I'm referring primarily to lists and tuples, and
> excluding strings, since for these there is ''.join()).
> 
Do you mean you want to flatten a list structure? There have been
several discussions about this, which Google will find for you quite easily.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From no.email at please.post  Wed Mar 24 12:05:10 2010
From: no.email at please.post (kj)
Date: Wed, 24 Mar 2010 16:05:10 +0000 (UTC)
Subject: What's the matter with docs.python.org?
Message-ID: <hodd7m$9vs$1@reader1.panix.com>




In the last couple of weeks, docs.python.org has been down repeatedly
(like right now).  Has anyone else noticed this?

~K



From python at bdurham.com  Wed Mar 24 12:17:16 2010
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 24 Mar 2010 12:17:16 -0400
Subject: Programmatically discovering encoding types supported by codecs module
Message-ID: <1269447436.19612.1366507993@webmail.messagingengine.com>

Is there a way to programmatically discover the encoding types
supported by the codecs module?

For example, the following link shows a table with Codec,
Aliases, and Language columns.
http://docs.python.org/library/codecs.html#standard-encodings

I'm looking for a way to programmatically generate this table
through some form of module introspection.

Ideas?

Malcolm
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From python at bdurham.com  Wed Mar 24 12:19:09 2010
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 24 Mar 2010 12:19:09 -0400
Subject: What's the matter with docs.python.org?
In-Reply-To: <hodd7m$9vs$1@reader1.panix.com>
References: <hodd7m$9vs$1@reader1.panix.com>
Message-ID: <1269447549.19932.1366508801@webmail.messagingengine.com>

KJ,

> In the last couple of weeks, docs.python.org has been down repeatedly
> (like right now).  Has anyone else noticed this?

I've been surfing docs.python.org all morning and haven't had any
problems.

I'm connecting from Bethlehem, PA (USA).

Malcolm


From philip at semanchuk.com  Wed Mar 24 12:19:19 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Wed, 24 Mar 2010 12:19:19 -0400
Subject: What's the matter with docs.python.org?
In-Reply-To: <hodd7m$9vs$1@reader1.panix.com>
References: <hodd7m$9vs$1@reader1.panix.com>
Message-ID: <2329E820-C060-43F2-AE3C-0FBF53221AA9@semanchuk.com>


On Mar 24, 2010, at 12:05 PM, kj wrote:

> In the last couple of weeks, docs.python.org has been down repeatedly
> (like right now).  Has anyone else noticed this?



http://downforeveryoneorjustme.com/docs.python.org

Works for me...

HTH
Philip


From duncan.booth at invalid.invalid  Wed Mar 24 12:20:17 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 24 Mar 2010 16:20:17 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
Message-ID: <Xns9D45A63272098duncanbooth@127.0.0.1>

kj <no.email at please.post> wrote:

> Is there a sequence-oriented equivalent to the sum built-in?  E.g.:
> 
>   seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)
> 
> ?
> 
Apart from the suggestions for Google for general list flattening, for this 
specific example you could just use the 'sum' built-in:

>>> sum(((1, 2), (5, 6)), ())
(1, 2, 5, 6)

Just give it an empty tuple as the starting value.


From steve at holdenweb.com  Wed Mar 24 12:24:55 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 24 Mar 2010 12:24:55 -0400
Subject: What's the matter with docs.python.org?
In-Reply-To: <hodd7m$9vs$1@reader1.panix.com>
References: <hodd7m$9vs$1@reader1.panix.com>
Message-ID: <hoded5$b26$1@dough.gmane.org>

kj wrote:
> 
> 
> In the last couple of weeks, docs.python.org has been down repeatedly
> (like right now).  Has anyone else noticed this?

http://downforeveryoneorjustme.com/docs.python.org

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From no.email at please.post  Wed Mar 24 12:25:45 2010
From: no.email at please.post (kj)
Date: Wed, 24 Mar 2010 16:25:45 +0000 (UTC)
Subject: What's the matter with docs.python.org?
References: <hodd7m$9vs$1@reader1.panix.com>
	<mailman.1145.1269447568.23598.python-list@python.org>
Message-ID: <hodee9$3dt$1@reader1.panix.com>

In <mailman.1145.1269447568.23598.python-list at python.org> Philip Semanchuk <philip at semanchuk.com> writes:


>On Mar 24, 2010, at 12:05 PM, kj wrote:

>> In the last couple of weeks, docs.python.org has been down repeatedly
>> (like right now).  Has anyone else noticed this?



>http://downforeveryoneorjustme.com/docs.python.org

Very handy.  Thanks!

~K


From gagsl-py2 at yahoo.com.ar  Wed Mar 24 12:49:30 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 24 Mar 2010 13:49:30 -0300
Subject: C-API: Extract information from function object
References: <b7632ea7-5523-4419-bc6b-b07bb2e6a443@g19g2000yqe.googlegroups.com>
Message-ID: <op.u92zosmwx6zn5v@gabriel.sleipnir-bsas>

En Wed, 24 Mar 2010 12:09:27 -0300, moerchendiser2k3  
<googler.1.webmaster at spamgourmet.com> escribi?:

> I have a reference to a function and would like to know how to extract
> information from a function object.
>
> Information I am looking for: line and file where this function is
> from.
>
> PyObject_Call can do this to when I call a function object and
> something failed so these information are written to the traceback. So
> any suggestions how to do that?

See the Language Reference; the associated code object holds the file and  
starting line the function comes from.
The traceback object contains better information (like the line being  
executed instead of the first one). Why don't you use it instead?

-- 
Gabriel Genellina



From anand.shashwat at gmail.com  Wed Mar 24 13:12:09 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Wed, 24 Mar 2010 22:42:09 +0530
Subject: spams
In-Reply-To: <20100324114251.ac0714c8.darcy@druid.net>
References: <d4ab53de1003240817n32427eb1wcefb0128637ae5e5@mail.gmail.com> 
	<20100324114251.ac0714c8.darcy@druid.net>
Message-ID: <d4ab53de1003241012r7bfa6e30v5a89d30c0f2f2aad@mail.gmail.com>

seems good :)

On Wed, Mar 24, 2010 at 9:12 PM, D'Arcy J.M. Cain <darcy at druid.net> wrote:

> On Wed, 24 Mar 2010 20:47:12 +0530
> Shashwat Anand <anand.shashwat at gmail.com> wrote:
> > Lately this list have been spammed a lot. Any workarounds by moderators?
>
> Not as long as it is gatewayed to Usenet.  You can kill most of the
> spam by blocking anything from gmail.com with a Newsgroups line.
> Unfortunately you will also block a lot of legitimate postings.
>
> If they would turn off the gateway then legitimate posters can choose
> to join the list but as long as the gateway is there then there is no
> reason to switch.
>
> With the gateway off there are all sorts of tools to reduce spam.  I
> think the best one is to set the flag to only allow subscribers to post
> and to start all new users as moderated and remove the moderation on
> the first posting as long as it is not spam.  If the first posting is
> not spam then chances are none of the rest from that user will be spam.
>
> --
> D'Arcy J.M. Cain <darcy at druid.net>         |  Democracy is three wolves
> http://www.druid.net/darcy/                |  and a sheep voting on
> +1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.
>
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From benjamin.kaplan at case.edu  Wed Mar 24 13:18:32 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Wed, 24 Mar 2010 13:18:32 -0400
Subject: Programmatically discovering encoding types supported by codecs 
	module
In-Reply-To: <1269447436.19612.1366507993@webmail.messagingengine.com>
References: <1269447436.19612.1366507993@webmail.messagingengine.com>
Message-ID: <ec96e1391003241018y136a4791odba7402b0ad3f95c@mail.gmail.com>

On Wed, Mar 24, 2010 at 12:17 PM,  <python at bdurham.com> wrote:
> Is there a way to programmatically discover the encoding types supported by
> the codecs module?
>
> For example, the following link shows a table with Codec, Aliases, and
> Language columns.
> http://docs.python.org/library/codecs.html#standard-encodings
>
> I'm looking for a way to programmatically generate this table through some
> form of module introspection.
>
> Ideas?
>
> Malcolm
> --

According to my brief messing around with the REPL,
encodings.aliases.aliases is a good place to start. I don't know of
any way to get the Language column, but at the very least that will
give you most of the supported encodings and any aliases they have.


From torriem at gmail.com  Wed Mar 24 13:33:46 2010
From: torriem at gmail.com (Michael Torrie)
Date: Wed, 24 Mar 2010 11:33:46 -0600
Subject: Unicode blues in Python3
In-Reply-To: <pan.2010.03.24.04.41.02@REMOVE.THIS.cybersource.com.au>
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>	<mailman.1099.1269367884.23598.python-list@python.org>	<3a428b39-bab1-48f2-b7df-560a849b8883@d27g2000yqf.googlegroups.com>
	<pan.2010.03.24.04.41.02@REMOVE.THIS.cybersource.com.au>
Message-ID: <4BAA4CFA.7000907@gmail.com>

Steven D'Aprano wrote:
> I think your question is malformed. You need to work out what behaviour 
> you actually want, before you can ask for help on how to get it.

It may or may not be malformed, but I understand the question.  So let
eme translate for you.  How can he write arbitrary bytes ( 0x0 through
0xff) to stdout without having them mangled by encodings.  It's a very
simple question, really.  Looks like Antoine Pitrou has answered this
question quite nicely as well.


From pruebauno at latinmail.com  Wed Mar 24 13:34:20 2010
From: pruebauno at latinmail.com (nn)
Date: Wed, 24 Mar 2010 10:34:20 -0700 (PDT)
Subject: Unicode blues in Python3
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
	<mailman.1138.1269438095.23598.python-list@python.org>
Message-ID: <408cc5cf-28ac-440e-9536-e557347c6c1f@i25g2000yqm.googlegroups.com>



Antoine Pitrou wrote:
> Le Tue, 23 Mar 2010 10:33:33 -0700, nn a ?crit?:
>
> > I know that unicode is the way to go in Python 3.1, but it is getting in
> > my way right now in my Unix scripts. How do I write a chr(253) to a
> > file?
> >
> > #nntst2.py
> > import sys,codecs
> > mychar=chr(253)
> > print(sys.stdout.encoding)
> > print(mychar)
>
> print() writes to the text (unicode) layer of sys.stdout.
> If you want to access the binary (bytes) layer, you must use
> sys.stdout.buffer. So:
>
>   sys.stdout.buffer.write(chr(253).encode('latin1'))
>
> or:
>
>   sys.stdout.buffer.write(bytes([253]))
>
> See http://docs.python.org/py3k/library/io.html#io.TextIOBase.buffer

Just what I needed! Now I full control of the output.

Thanks Antoine. The new io stack is still a bit of a mystery to me.

Thanks everybody else, and sorry for confusing the issue. Latin1 just
happens to be very convenient to manipulate bytes and is what I
thought of initially to handle my mix of textual and non-textual data.


From gagsl-py2 at yahoo.com.ar  Wed Mar 24 13:39:20 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 24 Mar 2010 14:39:20 -0300
Subject: Programmatically discovering encoding types supported by codecs
	module
References: <1269447436.19612.1366507993@webmail.messagingengine.com>
Message-ID: <op.u921zuyjx6zn5v@gabriel.sleipnir-bsas>

En Wed, 24 Mar 2010 13:17:16 -0300, <python at bdurham.com> escribi?:

> Is there a way to programmatically discover the encoding types
> supported by the codecs module?
>
> For example, the following link shows a table with Codec,
> Aliases, and Language columns.
> http://docs.python.org/library/codecs.html#standard-encodings
>
> I'm looking for a way to programmatically generate this table
> through some form of module introspection.

After looking at how things are done in codecs.c and encodings/__init__.py  
I think you should enumerate all modules in the encodings package that  
define a getregentry function.
Aliases come from encodings.aliases.aliases.

-- 
Gabriel Genellina



From wolfgang.lipp at gmail.com  Wed Mar 24 13:44:13 2010
From: wolfgang.lipp at gmail.com (_wolf)
Date: Wed, 24 Mar 2010 10:44:13 -0700 (PDT)
Subject: Is it possible to use re2 from Python?
References: <f853ea28-b236-4a17-8ded-43e5fe455d47@a18g2000yqc.googlegroups.com>
Message-ID: <ad7e9ab9-8b5e-4391-9552-9a006bf058ad@i25g2000yqm.googlegroups.com>


yes we can! http://github.com/facebook/pyre2

as pointed out by http://stackoverflow.com/users/219162/daniel-stutzbach

now gotta go and try it out.


From wolfgang.lipp at gmail.com  Wed Mar 24 13:47:22 2010
From: wolfgang.lipp at gmail.com (_wolf)
Date: Wed, 24 Mar 2010 10:47:22 -0700 (PDT)
Subject: how to do asynchronous http requests with epoll and python 3.1
Message-ID: <031f3a5b-28ac-42f0-a6a8-2cb7998cad6d@q16g2000yqq.googlegroups.com>


i asked this question before on
http://stackoverflow.com/questions/2489780/how-to-do-asynchronous-http-requests-with-epoll-and-python-3-1
but without a definitive answer as yet.

can someone help me out? i want to do several simple http GET and POST
requests in the same process using Python 3.1 without using threading.


the original post:

there is an interesting page [http://scotdoyle.com/python-epoll-
howto.html][1] about how to do asnchronous / non-blocking / AIO http
serving in python 3.

there is the [tornado web server][2] which does include a non-blocking
http client. i have managed to port parts of the server to python 3.1,
but the implementation of the client requires [pyCurl][3] and [seems
to have problems][4] (with one participant stating how ?Libcurl is
such a pain in the neck?, and looking at the incredibly ugly pyCurl
page i doubt pyCurl will arrive in py3+ any time soon).

now that epoll is available in the standard library, it should be
possible to do asynchronous http requests out of the box with python.
i really do not want to use asyncore or whatnot; epoll has a
reputation for being the ideal tool for the task, and it is part of
the python distribution, so using anything but epoll for non-blocking
http is highly counterintuitive (prove me wrong if you feel like it).

oh, and i feel threading is horrible. no threading. i use [stackless]
[5].

*people further interested in the topic of asynchronous http should
not miss out on this [talk by peter portante at PyCon2010][6]; also of
interest is [the keynote][7], where speaker antonio rodriguez at one
point emphasizes the importance of having up-to-date web technology
libraries right in the standard library.*


  [1]: http://scotdoyle.com/python-epoll-howto.html
  [2]: http://www.tornadoweb.org/
  [3]: http://pycurl.sourceforge.net/
  [4]:
http://groups.google.com/group/python-tornado/browse_thread/thread/276059a076593266/c49e8f834497271e?lnk=gst&q=httpclient+trouble+with+epoll#c49e8f834497271e
  [5]: http://stackless.com/
  [6]: http://python.mirocommunity.org/video/1501/pycon-2010-demystifying-non-bl
  [7]: http://python.mirocommunity.org/video/1605/pycon-2010-keynote-relentlessl


From python at bdurham.com  Wed Mar 24 13:55:32 2010
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 24 Mar 2010 13:55:32 -0400
Subject: Programmatically discovering encoding types supported by codecs
	module
In-Reply-To: <ec96e1391003241018y136a4791odba7402b0ad3f95c@mail.gmail.com>
References: <1269447436.19612.1366507993@webmail.messagingengine.com>
	<ec96e1391003241018y136a4791odba7402b0ad3f95c@mail.gmail.com>
Message-ID: <1269453332.6801.1366527617@webmail.messagingengine.com>

Benjamin,

> According to my brief messing around with the REPL, encodings.aliases.aliases is a good place to start. I don't know of any way to get the Language column, but at the very least that will give you most of the supported encodings and any aliases they have.

Thank you - that's exactly the type of information I was looking for.

I'm including the following for anyone browsing the mailing list
archives in the future.

Here's the snippet we're using to dynamically generate the codec
documentation posted on the docs.python website.

import encodings
encodingDict = encodings.aliases.aliases
encodingType = dict()
for key, value in encodingDict.items():
    if value not in encodingType:
        encodingType[ value ] = list()
    encodingType[ value ].append( key )

for key in sorted( encodingType.keys() ):
    aliases = sorted( encodingType[ key ] )
    aliases = ', '.join( aliases )
    print '%-20s%s' % ( key, aliases )

Regards,
Malcolm


From python at bdurham.com  Wed Mar 24 13:58:47 2010
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 24 Mar 2010 13:58:47 -0400
Subject: Programmatically discovering encoding types supported by codecs 
	module
In-Reply-To: <op.u921zuyjx6zn5v@gabriel.sleipnir-bsas>
References: <1269447436.19612.1366507993@webmail.messagingengine.com>
	<op.u921zuyjx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <1269453527.7192.1366528303@webmail.messagingengine.com>

Gabriel,

> After looking at how things are done in codecs.c and encodings/__init__.py  I think you should enumerate all modules in the encodings package that define a getregentry function. Aliases come from encodings.aliases.aliases.

Thanks for looking into this for me. Benjamin Kaplan made a similar
observation. My reply to him included the snippet of code we're using to
generate the actual list of encodings that our software will support
(thanks to Python's codecs and encodings modules).

Your help is always appreciated :)

Regards,
Malcolm


----- Original message -----
From: "Gabriel Genellina" <gagsl-py2 at yahoo.com.ar>
To: python-list at python.org
Date: Wed, 24 Mar 2010 14:39:20 -0300
Subject: Re: Programmatically discovering encoding types supported by
codecs    module

En Wed, 24 Mar 2010 13:17:16 -0300, <python at bdurham.com> escribi?:

> Is there a way to programmatically discover the encoding types
> supported by the codecs module?
>
> For example, the following link shows a table with Codec,
> Aliases, and Language columns.
> http://docs.python.org/library/codecs.html#standard-encodings
>
> I'm looking for a way to programmatically generate this table
> through some form of module introspection.


-- 
Gabriel Genellina

-- 
http://mail.python.org/mailman/listinfo/python-list



From joncle at googlemail.com  Wed Mar 24 14:13:11 2010
From: joncle at googlemail.com (Jon Clements)
Date: Wed, 24 Mar 2010 11:13:11 -0700 (PDT)
Subject: Advice needed on parallel processing in python
References: <0a050a71-8ff1-4393-aba9-9115eb38cbec@q21g2000yqm.googlegroups.com>
Message-ID: <ffc29248-7f1f-4bb7-85c8-f118806fd7d4@e7g2000yqf.googlegroups.com>

On 24 Mar, 15:27, Glazner <yoavglaz... at gmail.com> wrote:
> Hi!
>
> I need to replace an app that does number crunching over a local
> network.
> it have about 50 computers as slaves
> each computer needs to run COM that will do the "job"
> right now the system uses MFC threads and DCOM to distribute the load.
>
> as i said, Now i'm trying to replace this system with python.
> I already use win32all and read about Pareller Python and Pyro.
>
> a requirement is that messages can be sent to the remote worker.
>
> If anyone can share experience I'll love to hear
>
> Many Thanks,
> Yoav Glazner

Would Celery suit? http://celeryproject.org/

hth

Jon.


From anand.shashwat at gmail.com  Wed Mar 24 14:17:55 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Wed, 24 Mar 2010 23:47:55 +0530
Subject: Advice needed on parallel processing in python
In-Reply-To: <ffc29248-7f1f-4bb7-85c8-f118806fd7d4@e7g2000yqf.googlegroups.com>
References: <0a050a71-8ff1-4393-aba9-9115eb38cbec@q21g2000yqm.googlegroups.com>
	<ffc29248-7f1f-4bb7-85c8-f118806fd7d4@e7g2000yqf.googlegroups.com>
Message-ID: <d4ab53de1003241117r13363510l83e5c8a745314b0d@mail.gmail.com>

have you checked hadoop ?

On Wed, Mar 24, 2010 at 11:43 PM, Jon Clements <joncle at googlemail.com>wrote:

> On 24 Mar, 15:27, Glazner <yoavglaz... at gmail.com> wrote:
> > Hi!
> >
> > I need to replace an app that does number crunching over a local
> > network.
> > it have about 50 computers as slaves
> > each computer needs to run COM that will do the "job"
> > right now the system uses MFC threads and DCOM to distribute the load.
> >
> > as i said, Now i'm trying to replace this system with python.
> > I already use win32all and read about Pareller Python and Pyro.
> >
> > a requirement is that messages can be sent to the remote worker.
> >
> > If anyone can share experience I'll love to hear
> >
> > Many Thanks,
> > Yoav Glazner
>
> Would Celery suit? http://celeryproject.org/
>
> hth
>
> Jon.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From nagle at animats.com  Wed Mar 24 15:35:27 2010
From: nagle at animats.com (John Nagle)
Date: Wed, 24 Mar 2010 12:35:27 -0700
Subject: Unicode blues in Python3
In-Reply-To: <0250ffe0-0bb0-4cb2-8c3e-6446fb51b0b8@r27g2000yqn.googlegroups.com>
References: <de19fc47-f45f-46df-b956-4e021734edc7@t23g2000yqt.googlegroups.com>
	<mailman.1099.1269367884.23598.python-list@python.org>
	<3a428b39-bab1-48f2-b7df-560a849b8883@d27g2000yqf.googlegroups.com>
	<mailman.1101.1269374267.23598.python-list@python.org>
	<c75d1abb-2674-4c67-9701-38946b5db58f@l25g2000yqd.googlegroups.com>
	<4BA943E7.5000202@v.loewis.de>
	<0250ffe0-0bb0-4cb2-8c3e-6446fb51b0b8@r27g2000yqn.googlegroups.com>
Message-ID: <4baa64e1$0$1632$742ec2ed@news.sonic.net>

nn wrote:

> To be more informative I am both writing text and binary data
> together. That is I am embedding text from another source into stream
> that uses non-ascii characters as "control" characters. In Python2 I
> was processing it mostly as text containing a few "funny" characters.

    OK.  Then you need to be writing arrays of bytes, not strings.
Encoding is your problem.  This has nothing to do with Unicode.

				John Nagle


From leahy_rich at hotmail.com  Wed Mar 24 16:26:51 2010
From: leahy_rich at hotmail.com (Richard Leahy)
Date: Wed, 24 Mar 2010 22:26:51 +0200
Subject: help sending text to windows edit control
Message-ID: <SNT106-W30AC09BBEB775D2A3030E2F9250@phx.gbl>


I am trying to write text into a windows edit
control using python. it seems to write to every control i try except
the edit box not sure if this is a security measure or not. here is my
code any help please.



import os,sys,subprocess,time


from subprocess import *


from os import *


from ctypes import *


from ctypes.wintypes import *





PROCESS_ALL_ACCESS =     ( 0x000F0000 | 0x00100000 | 0xFFF )


kernel32 = windll.kernel32


pid      = sys.argv[1]





h_process = kernel32.OpenProcess( PROCESS_ALL_ACCESS, False, int(pid) )





if not h_process:


    print "[*] Couldn't acquire a handle to PID: %s" % pid


    sys.exit(0)





user32 = windll.user32


# parent window


window_handle = windll.user32.FindWindowA(None, "Windows App")








if not window_handle:


    print "[*] cant find window"





# 1 is the control id of the edit box child window


#below line has no effect on the control for some reason??


windll.user32.SetDlgItemTextA(window_handle, 1, "test") 





# 2 is the control id of a button


# this line works and changes the button text? not sure whats going on


windll.user32.SetDlgItemTextA(window_handle, 2, "test") 
 		 	   		  
_________________________________________________________________
Hotmail: Free, trusted and rich email service.
https://signup.live.com/signup.aspx?id=60969
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From python at bdurham.com  Wed Mar 24 16:34:59 2010
From: python at bdurham.com (python at bdurham.com)
Date: Wed, 24 Mar 2010 16:34:59 -0400
Subject: Is there a way to detect an environment's "default" encoding type
	(Windows)?
Message-ID: <1269462899.32722.1366552387@webmail.messagingengine.com>

Is there a way to detect an environment's "default" encoding type
under Windows? I'm not sure if code page and encoding mean the
same thing here.

For example: When I use Word on my US based version of Windows
and decide to save a file as text, I am prompted with an encoding
dialog that defaults to 'Windows (default)' which appears maps to
their 'Western European (Windows)' code page which I assume maps
to code page 1252. (That's a lot of assumptions!).

I would like to be able to make the same assumption about text
files produced on a user's system. (Of course our software will
offer a way to explictly specify an encoding format as well).

Here's what I've been able to dig up so far but I'm not sure how
reliable this is or if its the same information Word is looking
at when it offers a default encoding value.

>>> import locale
>>> locale.getdefaultlocale()[1]
'cp1252'

Any ideas?

Malcolm
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From dr.mtarver at ukonline.co.uk  Wed Mar 24 16:50:57 2010
From: dr.mtarver at ukonline.co.uk (Mark Tarver)
Date: Wed, 24 Mar 2010 13:50:57 -0700 (PDT)
Subject: the Python Foundation
Message-ID: <70db60af-cad4-4385-b199-e181f1e39898@b7g2000yqd.googlegroups.com>

>From the website

The Python Software Foundation (PSF) is a 501(c)(3) non-profit
corporation that
holds the intellectual property rights behind the Python programming
language. We manage the open source licensing for Python version 2.1
and later and own and protect the trademarks associated with Python.

Could somebody explain 'what holding the intellectual property rights'
means in this context and in what sense PSF manages the licensing and
protects the trademarks associated with Python?   This is for my
education.

thanks

Mark


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 24 17:07:24 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 24 Mar 2010 21:07:24 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
Message-ID: <pan.2010.03.24.21.07.24@REMOVE.THIS.cybersource.com.au>

On Wed, 24 Mar 2010 15:29:07 +0000, kj wrote:

> Is there a sequence-oriented equivalent to the sum built-in?  E.g.:
> 
>   seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)
> 
> ?

Yes, sum.

help(sum) is your friend.

>>> a = range(2)
>>> b = range(3)
>>> c = range(4)
>>> sum((a, b, c), [])
[0, 1, 0, 1, 2, 0, 1, 2, 3]


Beware though that sum on lists and tuples will be fairly inefficient if 
you have lots of them. You may find that this will be much more efficient:

result = []
for seq in sequences:
    result.extend(seq)



-- 
Steven


From robert.kern at gmail.com  Wed Mar 24 17:09:09 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 24 Mar 2010 16:09:09 -0500
Subject: the Python Foundation
In-Reply-To: <70db60af-cad4-4385-b199-e181f1e39898@b7g2000yqd.googlegroups.com>
References: <70db60af-cad4-4385-b199-e181f1e39898@b7g2000yqd.googlegroups.com>
Message-ID: <hodv1m$fbt$1@dough.gmane.org>

On 2010-03-24 15:50 PM, Mark Tarver wrote:
>> From the website
>
> The Python Software Foundation (PSF) is a 501(c)(3) non-profit
> corporation that
> holds the intellectual property rights behind the Python programming
> language. We manage the open source licensing for Python version 2.1
> and later and own and protect the trademarks associated with Python.
>
> Could somebody explain 'what holding the intellectual property rights'
> means in this context and in what sense PSF manages the licensing and
> protects the trademarks associated with Python?   This is for my
> education.

The PSF owns the Python language trademark:

   http://tess2.uspto.gov/bin/showfield?f=doc&state=4007:oc64of.5.1

Its trademark policy is given in detail here:

   http://www.python.org/psf/trademarks/

It also controls the license of the Python interpreter and its surrounding code. 
Contributors license their code to the PSF. Contributors keep the copyright to 
their code, but they agree to give the PSF the right to distribute it under a 
different license if the PSF decides to change licenses. See the Contributor 
Agreement:

   http://www.python.org/psf/contrib/contrib-form/

I believe they also outright own the copyright to most of the code that was in 
the Python 2.1 release and up until this Contributor Agreement was set up. I 
could be wrong about that, though.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From mehgcap at gmail.com  Wed Mar 24 17:12:45 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Wed, 24 Mar 2010 17:12:45 -0400
Subject: timers not canceling!
Message-ID: <bc7f680c1003241412s21753048k9f8cb16557c5e896@mail.gmail.com>

Hi all,
I am having trouble with a timer I am trying to use. It is the same
timer, but I need to cancel it when a certain event happens, then
start it again when a second event happens. The below is from a shell
session, not a file, but it shows my problem: I call cancel on a
timer, then call start on it, and it thinks it is already running?
What am I missing?

>>> from threading import Timer
>>> def func():
...  print("Time up!")
...
>>> t=Timer(10.0, func)
>>> t.start()
>>> t.cancel()
>>> t.start()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\python26\lib\threading.py", line 465, in start
    raise RuntimeError("thread already started")
RuntimeError: thread already started
>>>

I typed start, then typed cancel within ten seconds (probably four or
five), then called start again a couple seconds later. I figured
canceling the timer would kill the thread so I could start it again. I
am not looking for a reset, since I do not want it counting always.
Thanks.
-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From chairman at python.org  Wed Mar 24 17:18:39 2010
From: chairman at python.org (Steve Holden, Chairman, PSF)
Date: Wed, 24 Mar 2010 17:18:39 -0400
Subject: the Python Foundation
In-Reply-To: <70db60af-cad4-4385-b199-e181f1e39898@b7g2000yqd.googlegroups.com>
References: <70db60af-cad4-4385-b199-e181f1e39898@b7g2000yqd.googlegroups.com>
Message-ID: <4BAA81AF.1010308@python.org>

Mark Tarver wrote:
>>From the website
> 
> The Python Software Foundation (PSF) is a 501(c)(3) non-profit
> corporation that
> holds the intellectual property rights behind the Python programming
> language. We manage the open source licensing for Python version 2.1
> and later and own and protect the trademarks associated with Python.
> 
> Could somebody explain 'what holding the intellectual property rights'
> means in this context and in what sense PSF manages the licensing and
> protects the trademarks associated with Python?   This is for my
> education.
> 
The PSF requires that contributors sign an agreement licensing their
code to us, and allowing us to distribute it under the license of our
choosing (this does not in any way preclude the contributor licensing
the same code to any other party under different terms).

In this way people who use Python can be relatively sure that the code
is untrammeled by claims of copyright or patent by anyone other than the
PSF, and can therefore use it without fear of losing their rights to do
so because of legal action by third parties.

We have also registered the trademark "Python" for use in reference to
computer programming languages, thereby ensuring that we can take action
should some ill-advised individual or organization decide to produce
another language with "Python" in its name which we did not feel
conformed sufficiently strictly to the language definition, for instance.

The PSF has an established policy with regard to the use of its
trademarks, which you can read at

  http://www.python.org/psf/trademarks/

regards
 Steve
-- 
Steve Holden        Chairman, Python Software Foundation
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/


From steve at holdenweb.com  Wed Mar 24 17:36:20 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 24 Mar 2010 17:36:20 -0400
Subject: timers not canceling!
In-Reply-To: <bc7f680c1003241412s21753048k9f8cb16557c5e896@mail.gmail.com>
References: <bc7f680c1003241412s21753048k9f8cb16557c5e896@mail.gmail.com>
Message-ID: <4BAA85D4.8050405@holdenweb.com>

Alex Hall wrote:
> Hi all,
> I am having trouble with a timer I am trying to use. It is the same
> timer, but I need to cancel it when a certain event happens, then
> start it again when a second event happens. The below is from a shell
> session, not a file, but it shows my problem: I call cancel on a
> timer, then call start on it, and it thinks it is already running?
> What am I missing?
> 
>>>> from threading import Timer
>>>> def func():
> ...  print("Time up!")
> ...
>>>> t=Timer(10.0, func)
>>>> t.start()
>>>> t.cancel()
>>>> t.start()
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "C:\python26\lib\threading.py", line 465, in start
>     raise RuntimeError("thread already started")
> RuntimeError: thread already started
> 
> I typed start, then typed cancel within ten seconds (probably four or
> five), then called start again a couple seconds later. I figured
> canceling the timer would kill the thread so I could start it again. I
> am not looking for a reset, since I do not want it counting always.
> Thanks.

I believe you'll need to create a new Timer each time you need one - a
Timer is a threading.thread, and these can only be started once.

"thread already started" implies that the thread is running, but you
actually get the same message if you try to start any terminated thread
(including a canceled one), so "threads cannot be restarted" might be a
better message.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/


From steve at holdenweb.com  Wed Mar 24 17:36:20 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 24 Mar 2010 17:36:20 -0400
Subject: timers not canceling!
In-Reply-To: <bc7f680c1003241412s21753048k9f8cb16557c5e896@mail.gmail.com>
References: <bc7f680c1003241412s21753048k9f8cb16557c5e896@mail.gmail.com>
Message-ID: <4BAA85D4.8050405@holdenweb.com>

Alex Hall wrote:
> Hi all,
> I am having trouble with a timer I am trying to use. It is the same
> timer, but I need to cancel it when a certain event happens, then
> start it again when a second event happens. The below is from a shell
> session, not a file, but it shows my problem: I call cancel on a
> timer, then call start on it, and it thinks it is already running?
> What am I missing?
> 
>>>> from threading import Timer
>>>> def func():
> ...  print("Time up!")
> ...
>>>> t=Timer(10.0, func)
>>>> t.start()
>>>> t.cancel()
>>>> t.start()
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "C:\python26\lib\threading.py", line 465, in start
>     raise RuntimeError("thread already started")
> RuntimeError: thread already started
> 
> I typed start, then typed cancel within ten seconds (probably four or
> five), then called start again a couple seconds later. I figured
> canceling the timer would kill the thread so I could start it again. I
> am not looking for a reset, since I do not want it counting always.
> Thanks.

I believe you'll need to create a new Timer each time you need one - a
Timer is a threading.thread, and these can only be started once.

"thread already started" implies that the thread is running, but you
actually get the same message if you try to start any terminated thread
(including a canceled one), so "threads cannot be restarted" might be a
better message.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 24 17:38:08 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 24 Mar 2010 21:38:08 GMT
Subject: timers not canceling!
References: <mailman.1158.1269465169.23598.python-list@python.org>
Message-ID: <pan.2010.03.24.21.38.08@REMOVE.THIS.cybersource.com.au>

On Wed, 24 Mar 2010 17:12:45 -0400, Alex Hall wrote:

> Hi all,
> I am having trouble with a timer I am trying to use. It is the same
> timer, but I need to cancel it when a certain event happens, then start
> it again when a second event happens. The below is from a shell session,
> not a file, but it shows my problem: I call cancel on a timer, then call
> start on it, and it thinks it is already running? What am I missing?
> 
>>>> from threading import Timer
>>>> def func():
> ...  print("Time up!")
> ...
>>>> t=Timer(10.0, func)
>>>> t.start()
>>>> t.cancel()
>>>> t.start()
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "C:\python26\lib\threading.py", line 465, in start
>     raise RuntimeError("thread already started")
> RuntimeError: thread already started


The start method is to start generic threads, not just timers, and 
threads don't support being restarted.

Timers are fairly simple objects: after you start the thread, they just 
wait until the time expires, then run a function. You can cancel them, 
but not pause and restart them.

To do what you are trying to do, you will need to subclass either Timer 
or thread and implement your own logic for pausing or restarting the 
count down.


> I typed start, then typed cancel within ten seconds (probably four or
> five), then called start again a couple seconds later. I figured
> canceling the timer would kill the thread so I could start it again.


That's not how they work. "start" means "start the thread", not "start 
the timer", and threads cannot be restarted.

The documentation is very clear:

"start()
Start the thread?s activity.

It must be called at most once per thread object. It arranges for the 
object?s run() method to be invoked in a separate thread of control."

http://docs.python.org/library/threading.html#thread-objects


-- 
Steven


From martin at v.loewis.de  Wed Mar 24 18:22:01 2010
From: martin at v.loewis.de (Martin v. Loewis)
Date: Wed, 24 Mar 2010 23:22:01 +0100
Subject: RELEASED Python 2.6.5
In-Reply-To: <hoajos028di@drn.newsguy.com>
References: <mailman.990.1269039418.23598.python-list@python.org>
	<hoajos028di@drn.newsguy.com>
Message-ID: <hoe3a9$vj3$1@online.de>

> Is anyone else having trouble with the 2.6.5 Windows x86 installer?

Not me. Run

msiexec /i py...msi /l*v py.log

and inspect py.log for errors (post it to bugs.python.org if you can't
determine the cause of the problems).

Are you using SUBST by any chance?

Regards,
Martin


From gagsl-py2 at yahoo.com.ar  Wed Mar 24 18:50:11 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 24 Mar 2010 19:50:11 -0300
Subject: Programmatically discovering encoding types supported by codecs
	module
References: <1269447436.19612.1366507993@webmail.messagingengine.com>
	<op.u921zuyjx6zn5v@gabriel.sleipnir-bsas>
	<1269453527.7192.1366528303@webmail.messagingengine.com>
Message-ID: <op.u93gdxodx6zn5v@gabriel.sleipnir-bsas>

En Wed, 24 Mar 2010 14:58:47 -0300, <python at bdurham.com> escribi?:

>> After looking at how things are done in codecs.c and  
>> encodings/__init__.py  I think you should enumerate all modules in the  
>> encodings package that define a getregentry function. Aliases come from  
>> encodings.aliases.aliases.
>
> Thanks for looking into this for me. Benjamin Kaplan made a similar
> observation. My reply to him included the snippet of code we're using to
> generate the actual list of encodings that our software will support
> (thanks to Python's codecs and encodings modules).

I was curious as whether both methods would give the same results:

py> modules=set()
py> for name in glob.glob(os.path.join(encodings.__path__[0], "*.py")):
...   name = os.path.basename(name)[:-3]
...   try: mod = __import__("encodings."+name,  
fromlist=['ilovepythonbutsometimesihateit'])
...   except ImportError: continue
...   if hasattr(mod, 'getregentry'):
...     modules.add(name)
...
py> fromalias = set(encodings.aliases.aliases.values())
py> fromalias - modules
set(['tactis'])
py> modules - fromalias
set(['charmap',
      'cp1006',
      'cp737',
      'cp856',
      'cp874',
      'cp875',
      'idna',
      'iso8859_1',
      'koi8_u',
      'mac_arabic',
      'mac_centeuro',
      'mac_croatian',
      'mac_farsi',
      'mac_romanian',
      'palmos',
      'punycode',
      'raw_unicode_escape',
      'string_escape',
      'undefined',
      'unicode_escape',
      'unicode_internal',
      'utf_8_sig'])

There is a missing 'tactis' encoding (?) and about twenty without alias.

-- 
Gabriel Genellina



From no.email at nospam.invalid  Wed Mar 24 19:19:19 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Wed, 24 Mar 2010 16:19:19 -0700
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
Message-ID: <7x1vf91f60.fsf@ruckus.brouhaha.com>

kj <no.email at please.post> writes:
> Is there a sequence-oriented equivalent to the sum built-in?  E.g.:
>   seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)

use itertools.chain for this.  A few people have mentioned that sum will
also work, but I think for that purpose it could have O(n**2)
complexity.


From no.email at nospam.invalid  Wed Mar 24 19:22:17 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Wed, 24 Mar 2010 16:22:17 -0700
Subject: the Python Foundation
References: <70db60af-cad4-4385-b199-e181f1e39898@b7g2000yqd.googlegroups.com>
	<mailman.1159.1269465542.23598.python-list@python.org>
Message-ID: <7xwrx1z4nq.fsf@ruckus.brouhaha.com>

"Steve Holden, Chairman, PSF" <chairman at python.org> writes:
> We have also registered the trademark "Python" for use in reference to
> computer programming languages, thereby ensuring that we can take action
> should some ill-advised individual or organization decide to produce
> another language with "Python" in its name

There has been a Lisp compiler called "Python" for many years:

 http://portal.acm.org/citation.cfm?id=141471.141558


From steve at holdenweb.com  Wed Mar 24 20:26:20 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 24 Mar 2010 20:26:20 -0400
Subject: timers not canceling!
In-Reply-To: <4BAA85D4.8050405@holdenweb.com>
References: <bc7f680c1003241412s21753048k9f8cb16557c5e896@mail.gmail.com>
	<4BAA85D4.8050405@holdenweb.com>
Message-ID: <4BAAADAC.4030603@holdenweb.com>

Steve Holden wrote:
> Alex Hall wrote:
[...]
> "thread already started" implies that the thread is running, but you
> actually get the same message if you try to start any terminated thread
> (including a canceled one), so "threads cannot be restarted" might be a
> better message.
> 
Or, better still, "Threads can only be started once".

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/


From steve at holdenweb.com  Wed Mar 24 20:26:20 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 24 Mar 2010 20:26:20 -0400
Subject: timers not canceling!
In-Reply-To: <4BAA85D4.8050405@holdenweb.com>
References: <bc7f680c1003241412s21753048k9f8cb16557c5e896@mail.gmail.com>
	<4BAA85D4.8050405@holdenweb.com>
Message-ID: <4BAAADAC.4030603@holdenweb.com>

Steve Holden wrote:
> Alex Hall wrote:
[...]
> "thread already started" implies that the thread is running, but you
> actually get the same message if you try to start any terminated thread
> (including a canceled one), so "threads cannot be restarted" might be a
> better message.
> 
Or, better still, "Threads can only be started once".

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From patrickwasp at gmail.com  Wed Mar 24 20:33:35 2010
From: patrickwasp at gmail.com (Waspinator)
Date: Wed, 24 Mar 2010 17:33:35 -0700 (PDT)
Subject: cxfreeze on ubuntu 9.10
Message-ID: <84719a38-3d00-4d46-aa11-f0dca7ace71c@q15g2000yqj.googlegroups.com>

Hi,

I'm trying to compile a python script on Ubuntu 9.10. It uses the gtk
toolkit. I tried to run GUI2EXE for a cxfreeze gui, but even after
installing wxPython in synaptic it still complains about not having
it.

I also tried to use cxfreeze by itself but the file it produces does
not run.

I tried to follow the information at http://cx-freeze.sourceforge.net/cx_Freeze.html

I created a setup.py file that looks like this (from the page)

from cx_Freeze import setup, Executable

setup(
        name = "gtk_test",
        version = "0.1",
        description = "gtk_test",
        executables = [Executable("gtk_test.py")])

and ran:

python setup.py build


When I try to run the executable I get the following error:

../build/exe.linux-i686-2.6/library.zip/gtk/_gtk.py:12:
RuntimeWarning: tp_compare didn't return -1 or -2 for exception
ImportError: could not import gio
ImportError: could not import gio
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/cx_Freeze/initscripts/
Console.py", line 29, in <module>
    exec code in m.__dict__
  File "gtk_test.py", line 274, in <module>
  File "gtk_test.py", line 228, in main
AttributeError: 'module' object has no attribute 'Window'

I was thinking of using the 'copy-dependent-files' option but I'm not
sure how.

Any ideas?

Thanks


From mehgcap at gmail.com  Wed Mar 24 22:31:03 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Wed, 24 Mar 2010 22:31:03 -0400
Subject: threads (specifically timers) and releasing resources
Message-ID: <bc7f680c1003241931v4ec88d15ge5639d96834c1db5@mail.gmail.com>

Okay, I have my program and it has three different modes (there will
be more than that). Each mode will have a timer attached to it. If the
mode remains active and the timer runs out, a function specific to
that mode is called. If that mode is switched away from, however, the
timer is canceled and a new timer is created for the mode to which the
user just switched. My question is: what happens with resources taken
up by previous timers, whether they cancel or execute? I would hate
for my program to run for a long time and slowly build up a massive
list of old threads (timers), taking up resources which should have
been released. Will Python perform GC and completely erase a thread
once it is done, or will it keep hanging around? If the latter, is
there a way to completely destroy a thread? Thanks; Google was not too
helpful on this one!

-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From kurianmthayil at gmail.com  Wed Mar 24 22:59:38 2010
From: kurianmthayil at gmail.com (Kurian Thayil)
Date: Thu, 25 Mar 2010 08:29:38 +0530
Subject: MySQLdb compiled -- Import issue
Message-ID: <1269485978.14968.17.camel@localhost>

Hi All,

I am just a month old with Python and trying to learn CGI with Python. I
was trying to install MySQLdb module in my new CentOS 5.3 box with
Python 2.4.3 default install. I downloaded the tar-ball of MySQLdb
module (MySQL-python-1.2.3c1). Did build as normal user and install as
root. MySQL server version that I'm using is 5.1.41, if that has
anything to do with the error. I then copied, libmysqlclient_r.so.16
library to /usr/lib/ folder and then I am able to import the module as
root user. But cannot do this as normal user.

Now, while doing import MySQLdb as normal user, I get the following
error message. The scripts will be run as apache and hence cannot have
this error. Please check the following output. Also I have attached the
output while doing build and install process.

[kurianmt at server MySQL-python-1.2.3c1]$ python
Python 2.4.3 (#1, Jan 21 2009, 01:10:13) 
[GCC 4.1.2 20071124 (Red Hat 4.1.2-42)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import MySQLdb
/usr/lib/python2.4/site-packages/MySQL_python-1.2.3c1-py2.4-linux-i686.egg/_mysql.py:3: UserWarning: Module _mysql was already imported from /usr/lib/python2.4/site-packages/MySQL_python-1.2.3c1-py2.4-linux-i686.egg/_mysql.pyc, but /opt/downloads/py-modules/MySQL-python-1.2.3c1 is being added to sys.path

It would be a great help if I understand what's going on!!! Thanks in
advance.

Regards,

Kurian Mathew Thayil.
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[kurianmt at server MySQL-python-1.2.3c1]$ python setup.py build
running build
running build_py
creating build
creating build/lib.linux-i686-2.4
copying _mysql_exceptions.py -> build/lib.linux-i686-2.4
creating build/lib.linux-i686-2.4/MySQLdb
copying MySQLdb/__init__.py -> build/lib.linux-i686-2.4/MySQLdb
copying MySQLdb/converters.py -> build/lib.linux-i686-2.4/MySQLdb
copying MySQLdb/connections.py -> build/lib.linux-i686-2.4/MySQLdb
copying MySQLdb/cursors.py -> build/lib.linux-i686-2.4/MySQLdb
copying MySQLdb/release.py -> build/lib.linux-i686-2.4/MySQLdb
copying MySQLdb/times.py -> build/lib.linux-i686-2.4/MySQLdb
creating build/lib.linux-i686-2.4/MySQLdb/constants
copying MySQLdb/constants/__init__.py -> build/lib.linux-i686-2.4/MySQLdb/constants
copying MySQLdb/constants/CR.py -> build/lib.linux-i686-2.4/MySQLdb/constants
copying MySQLdb/constants/FIELD_TYPE.py -> build/lib.linux-i686-2.4/MySQLdb/constants
copying MySQLdb/constants/ER.py -> build/lib.linux-i686-2.4/MySQLdb/constants
copying MySQLdb/constants/FLAG.py -> build/lib.linux-i686-2.4/MySQLdb/constants
copying MySQLdb/constants/REFRESH.py -> build/lib.linux-i686-2.4/MySQLdb/constants
copying MySQLdb/constants/CLIENT.py -> build/lib.linux-i686-2.4/MySQLdb/constants
running build_ext
building '_mysql' extension
creating build/temp.linux-i686-2.4
gcc -pthread -fno-strict-aliasing -DNDEBUG -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i386 -mtune=generic -fasynchronous-unwind-tables -D_GNU_SOURCE -fPIC -fPIC -Dversion_info=(1,2,3,'gamma',1) -D__version__=1.2.3c1 -I/usr/local/include/mysql -I/usr/include/python2.4 -c _mysql.c -o build/temp.linux-i686-2.4/_mysql.o -DUNIV_LINUX -DUNIV_LINUX
In file included from _mysql.c:36:
/usr/local/include/mysql/my_config.h:1050:1: warning: "HAVE_WCSCOLL" redefined
In file included from /usr/include/python2.4/pyconfig.h:4,
                 from /usr/include/python2.4/Python.h:8,
                 from pymemcompat.h:10,
                 from _mysql.c:29:
/usr/include/python2.4/pyconfig-32.h:648:1: warning: this is the location of the previous definition
gcc -pthread -shared build/temp.linux-i686-2.4/_mysql.o -L/usr/local/lib/mysql -lmysqlclient_r -lz -lpthread -lcrypt -lnsl -lm -lpthread -o build/lib.linux-i686-2.4/_mysql.so
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[root at server MySQL-python-1.2.3c1]# python setup.py install
running install
running bdist_egg
running egg_info
writing MySQL_python.egg-info/PKG-INFO
writing top-level names to MySQL_python.egg-info/top_level.txt
writing dependency_links to MySQL_python.egg-info/dependency_links.txt
reading manifest file 'MySQL_python.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'MySQL_python.egg-info/SOURCES.txt'
installing library code to build/bdist.linux-i686/egg
running install_lib
running build_py
copying MySQLdb/release.py -> build/lib.linux-i686-2.4/MySQLdb
running build_ext
creating build/bdist.linux-i686
creating build/bdist.linux-i686/egg
copying build/lib.linux-i686-2.4/_mysql.so -> build/bdist.linux-i686/egg
copying build/lib.linux-i686-2.4/_mysql_exceptions.py -> build/bdist.linux-i686/egg
creating build/bdist.linux-i686/egg/MySQLdb
copying build/lib.linux-i686-2.4/MySQLdb/connections.py -> build/bdist.linux-i686/egg/MySQLdb
creating build/bdist.linux-i686/egg/MySQLdb/constants
copying build/lib.linux-i686-2.4/MySQLdb/constants/CR.py -> build/bdist.linux-i686/egg/MySQLdb/constants
copying build/lib.linux-i686-2.4/MySQLdb/constants/__init__.py -> build/bdist.linux-i686/egg/MySQLdb/constants
copying build/lib.linux-i686-2.4/MySQLdb/constants/REFRESH.py -> build/bdist.linux-i686/egg/MySQLdb/constants
copying build/lib.linux-i686-2.4/MySQLdb/constants/FIELD_TYPE.py -> build/bdist.linux-i686/egg/MySQLdb/constants
copying build/lib.linux-i686-2.4/MySQLdb/constants/FLAG.py -> build/bdist.linux-i686/egg/MySQLdb/constants
copying build/lib.linux-i686-2.4/MySQLdb/constants/ER.py -> build/bdist.linux-i686/egg/MySQLdb/constants
copying build/lib.linux-i686-2.4/MySQLdb/constants/CLIENT.py -> build/bdist.linux-i686/egg/MySQLdb/constants
copying build/lib.linux-i686-2.4/MySQLdb/__init__.py -> build/bdist.linux-i686/egg/MySQLdb
copying build/lib.linux-i686-2.4/MySQLdb/times.py -> build/bdist.linux-i686/egg/MySQLdb
copying build/lib.linux-i686-2.4/MySQLdb/release.py -> build/bdist.linux-i686/egg/MySQLdb
copying build/lib.linux-i686-2.4/MySQLdb/cursors.py -> build/bdist.linux-i686/egg/MySQLdb
copying build/lib.linux-i686-2.4/MySQLdb/converters.py -> build/bdist.linux-i686/egg/MySQLdb
byte-compiling build/bdist.linux-i686/egg/_mysql_exceptions.py to _mysql_exceptions.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/connections.py to connections.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/constants/CR.py to CR.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/constants/__init__.py to __init__.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/constants/REFRESH.py to REFRESH.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/constants/FIELD_TYPE.py to FIELD_TYPE.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/constants/FLAG.py to FLAG.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/constants/ER.py to ER.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/constants/CLIENT.py to CLIENT.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/__init__.py to __init__.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/times.py to times.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/release.py to release.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/cursors.py to cursors.pyc
byte-compiling build/bdist.linux-i686/egg/MySQLdb/converters.py to converters.pyc
creating stub loader for _mysql.so
byte-compiling build/bdist.linux-i686/egg/_mysql.py to _mysql.pyc
creating build/bdist.linux-i686/egg/EGG-INFO
copying MySQL_python.egg-info/PKG-INFO -> build/bdist.linux-i686/egg/EGG-INFO
copying MySQL_python.egg-info/SOURCES.txt -> build/bdist.linux-i686/egg/EGG-INFO
copying MySQL_python.egg-info/dependency_links.txt -> build/bdist.linux-i686/egg/EGG-INFO
copying MySQL_python.egg-info/top_level.txt -> build/bdist.linux-i686/egg/EGG-INFO
writing build/bdist.linux-i686/egg/EGG-INFO/native_libs.txt
zip_safe flag not set; analyzing archive contents...
creating dist
creating 'dist/MySQL_python-1.2.3c1-py2.4-linux-i686.egg' and adding 'build/bdist.linux-i686/egg' to it
removing 'build/bdist.linux-i686/egg' (and everything under it)
Processing MySQL_python-1.2.3c1-py2.4-linux-i686.egg
Removing /usr/lib/python2.4/site-packages/MySQL_python-1.2.3c1-py2.4-linux-i686.egg
Copying MySQL_python-1.2.3c1-py2.4-linux-i686.egg to /usr/lib/python2.4/site-packages
MySQL-python 1.2.3c1 is already the active version in easy-install.pth

Installed /usr/lib/python2.4/site-packages/MySQL_python-1.2.3c1-py2.4-linux-i686.egg
Processing dependencies for MySQL-python==1.2.3c1
Finished processing dependencies for MySQL-python==1.2.3c1
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From half.italian at gmail.com  Wed Mar 24 23:15:00 2010
From: half.italian at gmail.com (Sean DiZazzo)
Date: Wed, 24 Mar 2010 20:15:00 -0700 (PDT)
Subject: MySQLdb compiled -- Import issue
References: <mailman.1166.1269485871.23598.python-list@python.org>
Message-ID: <85161d90-2db8-4bbe-ab13-02f27abab82a@y11g2000prf.googlegroups.com>

On Mar 24, 7:59?pm, Kurian Thayil <kurianmtha... at gmail.com> wrote:
> Hi All,
>
> I am just a month old with Python and trying to learn CGI with Python. I
> was trying to install MySQLdb module in my new CentOS 5.3 box with
> Python 2.4.3 default install. I downloaded the tar-ball of MySQLdb
> module (MySQL-python-1.2.3c1). Did build as normal user and install as
> root. MySQL server version that I'm using is 5.1.41, if that has
> anything to do with the error. I then copied, libmysqlclient_r.so.16
> library to /usr/lib/ folder and then I am able to import the module as
> root user. But cannot do this as normal user.
>
> Now, while doing import MySQLdb as normal user, I get the following
> error message. The scripts will be run as apache and hence cannot have
> this error. Please check the following output. Also I have attached the
> output while doing build and install process.
>
> [kurianmt at server MySQL-python-1.2.3c1]$ python
> Python 2.4.3 (#1, Jan 21 2009, 01:10:13)
> [GCC 4.1.2 20071124 (Red Hat 4.1.2-42)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.>>> import MySQLdb
>
> /usr/lib/python2.4/site-packages/MySQL_python-1.2.3c1-py2.4-linux-i686.egg/_mysql.py:3: UserWarning: Module _mysql was already imported from /usr/lib/python2.4/site-packages/MySQL_python-1.2.3c1-py2.4-linux-i686.egg/_mysql.pyc, but /opt/downloads/py-modules/MySQL-python-1.2.3c1 is being added to sys.path
>
> It would be a great help if I understand what's going on!!! Thanks in
> advance.
>
> Regards,
>
> Kurian Mathew Thayil.
>
> ?MySQLdb-build.txt
> 3KViewDownload
>
> ?MySQLdb-Install.txt
> 6KViewDownload
>
> ?signature.asc
> < 1KViewDownload

The warning looks familiar.  Are you running python from the MySQLdb
source directory?  ie.  /opt/downloads/py-modules/MySQL-python-1.2.3c1

I think you just need to change directories and the warning will go
away.  Check what's happening on line 3 of _mysql.py  I don't have the
source in front of me.

~Sean


From aharrisreid at googlemail.com  Wed Mar 24 23:17:52 2010
From: aharrisreid at googlemail.com (Alan Harris-Reid)
Date: Thu, 25 Mar 2010 03:17:52 +0000
Subject: Super() function
Message-ID: <4BAAD5E0.9050604@googlemail.com>

Hi,

Using Python 3.1, I sometimes use the super() function to call the 
equivalent method from a parent class, for example

def mymethod(self):
    super().mymethod()
    some more code...

Is there any way of writing the code so that the super() call is generic 
and automatically recognises the name of the current method (ie. 
something like super().thismethod()) or do I always have to repeat the 
method name after super()?

TIA,
Alan


From littlesweetmelon at gmail.com  Wed Mar 24 23:28:58 2010
From: littlesweetmelon at gmail.com (=?GB2312?B?zPC5zw==?=)
Date: Thu, 25 Mar 2010 11:28:58 +0800
Subject: Is there any library for indexing binary data?
Message-ID: <cdb837ea1003242028u7047f346l7d4f405b609b01ff@mail.gmail.com>

Howdy,

Recently, I am finding a good library for build index on binary data.
Xapian & Lucene for python binding focus on text digestion rather than
binary data. Could anyone give me some recommendation? Is there any
library for indexing binary data no matter whether it is written in
python?

In my case, there is a very big datatable which stores structured
binary data, eg:
struct Item
{
    long id; // used as key
    double value;
};

I want to build the index on "id" field to speed on searching. Since
this datatable is not constant, the library should support incremental
indexing. If there is no suitable library, I have to do the index by
myself...

Thank you in advance.

--
ShenLei


From timr at probo.com  Wed Mar 24 23:41:25 2010
From: timr at probo.com (Tim Roberts)
Date: Wed, 24 Mar 2010 20:41:25 -0700
Subject: device identification
References: <9c7ed2c8-f04b-4302-a4be-bde1628ef966@y11g2000prf.googlegroups.com>
	<46ggq59e49qpna7f9ae6q8ftobhot351un@4ax.com>
	<57c86289-85e7-4c9f-b7ed-787687d9a5b6@x23g2000prd.googlegroups.com>
Message-ID: <mkmlq5ti6mu1s2hibjsskl9gdbqtshhfhm@4ax.com>

Omer Ihsan <omrihsan at gmail.com> wrote:
>
>VID and PID is fair enough. now what i want is that i have a threaded
>code that threads two functions to run at the same time. i want each
>function to run seperate devices. the problem is if it doesnt identify
>the attached devices it might run the code on a single device which
>isnt what is required.

Some of the libraries that pyusb uses are not thread-safe, like libusb 0.1.

>how will i be able to run a code on a device of my choice???....you
>can leave away the threading part for now.

You can return all of the devices with a particular VID and PID:

    collection = usb.core.find( find_all=True, idVendor=0x1234,
idProduct=0x5678 )

Then you can dish those out to threads using something like the queue
module.

Or, usb.core.find accepts a predicate function that allows you to use any
criteria you wish.

What kind of device are you trying to manipulate?  I have a lot of USB
experience -- perhaps I can offer advice.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From kurianmthayil at gmail.com  Wed Mar 24 23:41:26 2010
From: kurianmthayil at gmail.com (Kurian Thayil)
Date: Thu, 25 Mar 2010 09:11:26 +0530
Subject: MySQLdb compiled -- Import issue
In-Reply-To: <85161d90-2db8-4bbe-ab13-02f27abab82a@y11g2000prf.googlegroups.com>
References: <mailman.1166.1269485871.23598.python-list@python.org>
	<85161d90-2db8-4bbe-ab13-02f27abab82a@y11g2000prf.googlegroups.com>
Message-ID: <1269488486.14968.22.camel@localhost>



On Wed, 2010-03-24 at 20:15 -0700, Sean DiZazzo wrote:

> On Mar 24, 7:59 pm, Kurian Thayil <kurianmtha... at gmail.com> wrote:
> > Hi All,
> >
> > I am just a month old with Python and trying to learn CGI with Python. I
> > was trying to install MySQLdb module in my new CentOS 5.3 box with
> > Python 2.4.3 default install. I downloaded the tar-ball of MySQLdb
> > module (MySQL-python-1.2.3c1). Did build as normal user and install as
> > root. MySQL server version that I'm using is 5.1.41, if that has
> > anything to do with the error. I then copied, libmysqlclient_r.so.16
> > library to /usr/lib/ folder and then I am able to import the module as
> > root user. But cannot do this as normal user.
> >
> > Now, while doing import MySQLdb as normal user, I get the following
> > error message. The scripts will be run as apache and hence cannot have
> > this error. Please check the following output. Also I have attached the
> > output while doing build and install process.
> >
> > [kurianmt at server MySQL-python-1.2.3c1]$ python
> > Python 2.4.3 (#1, Jan 21 2009, 01:10:13)
> > [GCC 4.1.2 20071124 (Red Hat 4.1.2-42)] on linux2
> > Type "help", "copyright", "credits" or "license" for more information.>>> import MySQLdb
> >
> > /usr/lib/python2.4/site-packages/MySQL_python-1.2.3c1-py2.4-linux-i686.egg/_mysql.py:3: UserWarning: Module _mysql was already imported from /usr/lib/python2.4/site-packages/MySQL_python-1.2.3c1-py2.4-linux-i686.egg/_mysql.pyc, but /opt/downloads/py-modules/MySQL-python-1.2.3c1 is being added to sys.path
> >
> > It would be a great help if I understand what's going on!!! Thanks in
> > advance.
> >
> > Regards,
> >
> > Kurian Mathew Thayil.
> >
> >  MySQLdb-build.txt
> > 3KViewDownload
> >
> >  MySQLdb-Install.txt
> > 6KViewDownload
> >
> >  signature.asc
> > < 1KViewDownload
> 
> The warning looks familiar.  Are you running python from the MySQLdb
> source directory?  ie.  /opt/downloads/py-modules/MySQL-python-1.2.3c1
> 
> I think you just need to change directories and the warning will go
> away.  Check what's happening on line 3 of _mysql.py  I don't have the
> source in front of me.
> 
> ~Sean


Hi Sean,

You are right. I was trying to import the module sitting on the source
folder :"-). Thanks for your quick response and let me try further. 

Regards,

Kurian Mathew Thayil.
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From ysj.ray at gmail.com  Wed Mar 24 23:42:41 2010
From: ysj.ray at gmail.com (=?UTF-8?B?5bKz5biF5p2w?=)
Date: Thu, 25 Mar 2010 11:42:41 +0800
Subject: Super() function
In-Reply-To: <4BAAD5E0.9050604@googlemail.com>
References: <4BAAD5E0.9050604@googlemail.com>
Message-ID: <797c8cbd1003242042s32ee16bbxe6d937a16ab35a50@mail.gmail.com>

Hi:

On 25 March 2010 11:17, Alan Harris-Reid <aharrisreid at googlemail.com> wrote:

> Hi,
>
> Using Python 3.1, I sometimes use the super() function to call the
> equivalent method from a parent class, for example
>
> def mymethod(self):
>   super().mymethod()
>   some more code...
>
> Is there any way of writing the code so that the super() call is generic
> and automatically recognises the name of the current method (ie. something
> like super().thismethod()) or do I always have to repeat the method name
> after super()?
>
> TIA,
> Alan
> --
> http://mail.python.org/mailman/listinfo/python-list
>



   I think, the super() method is designed to delegate any method call to
one of the class in its mro list, and the super() function its self return a
'super' object, so it is better to write what method you want to delegate,
maybe it's not the current method.

-- 
Best wishes from Ray ...
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From wuwei23 at gmail.com  Wed Mar 24 23:47:19 2010
From: wuwei23 at gmail.com (alex23)
Date: Wed, 24 Mar 2010 20:47:19 -0700 (PDT)
Subject: Super() function
References: <mailman.1167.1269487078.23598.python-list@python.org>
Message-ID: <4cb1beeb-a663-46e0-bedb-63e076b7f32c@h35g2000pri.googlegroups.com>

Alan Harris-Reid <aharrisr... at googlemail.com> wrote:
> Is there any way of writing the code so that the super() call is generic
> and automatically recognises the name of the current method (ie.
> something like super().thismethod()) or do I always have to repeat the
> method name after super()?

To the best of my knowledge, you always need to repeat the method
name. super() returns a proxy object that has no awareness of its
context, so it's unaware of the method it's being called within (in
fact, there's nothing that restricts super() to only being used in
methods...).

You could probably write a wrapper function that uses inspect to
determine in which context super() is being called, but unless you're
regularly finding this to be a problem with refactoring I wouldn't
worry about it.


From half.italian at gmail.com  Wed Mar 24 23:54:49 2010
From: half.italian at gmail.com (Sean DiZazzo)
Date: Wed, 24 Mar 2010 20:54:49 -0700 (PDT)
Subject: MySQLdb compiled -- Import issue
References: <mailman.1166.1269485871.23598.python-list@python.org> 
	<85161d90-2db8-4bbe-ab13-02f27abab82a@y11g2000prf.googlegroups.com> 
	<mailman.1169.1269488374.23598.python-list@python.org>
Message-ID: <e5464a0a-033a-4f84-8eb4-2c77cee25afa@u19g2000prh.googlegroups.com>


> You are right. I was trying to import the module sitting on the source
> folder :"-). Thanks for your quick response and let me try further.


Sweet!  I remember it because it confused the hell out of me on at
least one past occasion.  :)


From gagsl-py2 at yahoo.com.ar  Thu Mar 25 00:00:27 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 25 Mar 2010 01:00:27 -0300
Subject: Super() function
References: <4BAAD5E0.9050604@googlemail.com>
Message-ID: <op.u93uq1jyx6zn5v@gabriel.sleipnir-bsas>

En Thu, 25 Mar 2010 00:17:52 -0300, Alan Harris-Reid  
<aharrisreid at googlemail.com> escribi?:

> Using Python 3.1, I sometimes use the super() function to call the  
> equivalent method from a parent class, for example
>
> def mymethod(self):
>     super().mymethod()
>     some more code...
>
> Is there any way of writing the code so that the super() call is generic  
> and automatically recognises the name of the current method (ie.  
> something like super().thismethod()) or do I always have to repeat the  
> method name after super()?

This recipe does what you want:
http://code.activestate.com/recipes/286195-selfsuper/
(but requires a bit of black magic...)

-- 
Gabriel Genellina



From timr at probo.com  Thu Mar 25 00:14:23 2010
From: timr at probo.com (Tim Roberts)
Date: Wed, 24 Mar 2010 21:14:23 -0700
Subject: Advice Criticism on Python App
References: <de18cb49-b0fd-4862-b9af-3743720e0db6@u19g2000prh.googlegroups.com>
Message-ID: <uholq5peen08i78f968juvhskpedhhnlr3@4ax.com>

Jimbo <nilly16 at yahoo.com> wrote:
>
>class stock:
>    code             = ""
>    purchasePrice    = 0
>    purchaseQuantity = 0
>    price            = []  # list of recent prices
>    recentBid        = []  # list of recent bids for stock
>    recentOffer      = []  # list of recent offers for stock
>    stockVol         = []  # list of stock quantity available on
>market

Using lists as class variables is a very good way to create very surprising
bugs.  Consider the following:

  C:\Dev>type x.py

  class test:
      check = []
      def __init__(self):
          self.check.append(1)

  x = test()
  y = test()
  z = test()
  print x.check
  print y.check
  print z.check

  C:\Dev>x.py
  [1, 1, 1]
  [1, 1, 1]
  [1, 1, 1]

  C:\Dev>

>    def __init__(self):
>        """ Default Constructor """
>        self.code             = ""
>        self.purchasePrice    = 0
>        self.purchaseQuantity = 0
>
>    def constructor(self, stockCode, purPrice, purQuant):
>        """ Constructor """
>        self.code             = stockCode
>        self.purchasePrice    = purPrice
>        self.purchaseQuantity = purQuant

The "constructor" concept here is not very Pythonic.  Why not replace those
both with:

    def __init__(self, stockCode="", purPrice=0, purQuant=0):
        self.code             = stockCode
        self.purchasePrice    = purPrice
        self.purchaseQuantity = purQuant
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From gagsl-py2 at yahoo.com.ar  Thu Mar 25 00:29:07 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Thu, 25 Mar 2010 01:29:07 -0300
Subject: Is there any library for indexing binary data?
References: <cdb837ea1003242028u7047f346l7d4f405b609b01ff@mail.gmail.com>
Message-ID: <op.u93v2thgx6zn5v@gabriel.sleipnir-bsas>

En Thu, 25 Mar 2010 00:28:58 -0300, ?? <littlesweetmelon at gmail.com>  
escribi?:

> Recently, I am finding a good library for build index on binary data.
> Xapian & Lucene for python binding focus on text digestion rather than
> binary data. Could anyone give me some recommendation? Is there any
> library for indexing binary data no matter whether it is written in
> python?
>
> In my case, there is a very big datatable which stores structured
> binary data, eg:
> struct Item
> {
>     long id; // used as key
>     double value;
> };
>
> I want to build the index on "id" field to speed on searching. Since
> this datatable is not constant, the library should support incremental
> indexing. If there is no suitable library, I have to do the index by
> myself...

What about a database?

-- 
Gabriel Genellina



From steven at REMOVE.THIS.cybersource.com.au  Thu Mar 25 01:10:06 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 25 Mar 2010 05:10:06 GMT
Subject: Advice Criticism on Python App
References: <de18cb49-b0fd-4862-b9af-3743720e0db6@u19g2000prh.googlegroups.com>
	<uholq5peen08i78f968juvhskpedhhnlr3@4ax.com>
Message-ID: <pan.2010.03.25.05.10.05@REMOVE.THIS.cybersource.com.au>

On Wed, 24 Mar 2010 21:14:23 -0700, Tim Roberts wrote:

> Jimbo <nilly16 at yahoo.com> wrote:
>>
>>class stock:
>>    code             = ""
>>    purchasePrice    = 0
>>    purchaseQuantity = 0
>>    price            = []  # list of recent prices 
>>    recentBid        = []  # list of recent bids for stock
>>    recentOffer      = []  # list of recent offers for stock
>>    stockVol         = []  # list of stock quantity available on market
> 
> Using lists as class variables is a very good way to create very
> surprising bugs.  Consider the following:
[snip]


Don't you think that the class attributes are *supposed* to be shared by 
all instances? In that case the behaviour you show is not a bug at all.


-- 
Steven


From littlesweetmelon at gmail.com  Thu Mar 25 01:53:45 2010
From: littlesweetmelon at gmail.com (=?GB2312?B?zPC5zw==?=)
Date: Thu, 25 Mar 2010 13:53:45 +0800
Subject: Is there any library for indexing binary data?
In-Reply-To: <op.u93v2thgx6zn5v@gabriel.sleipnir-bsas>
References: <cdb837ea1003242028u7047f346l7d4f405b609b01ff@mail.gmail.com>
	<op.u93v2thgx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <cdb837ea1003242253r341c6823q315c6fc6c30239d3@mail.gmail.com>

Well, Database is not proper because 1. the table is very big (~10^9
rows) 2. we should support very fast *simple* query that is to get
value corresponding to single key (~10^7 queries / second).

Currently, I have implemented a specific algorithm to deal with my
problem. However, I want to employ some library to simplify codings,
otherwise I have to write my own code for each big table. It is
possible that, after using indexing library, the program cannot run as
fast as homemade code. But if it can greatly simplify my job and can
provide satisfied speed (eg 10^5~10^6 queries / second), the indexing
library is still a good choice for me.

--
ShenLei

2010/3/25 Gabriel Genellina <gagsl-py2 at yahoo.com.ar>:
> En Thu, 25 Mar 2010 00:28:58 -0300, ?? <littlesweetmelon at gmail.com>
> escribi?:
>
>> Recently, I am finding a good library for build index on binary data.
>> Xapian & Lucene for python binding focus on text digestion rather than
>> binary data. Could anyone give me some recommendation? Is there any
>> library for indexing binary data no matter whether it is written in
>> python?
>>
>> In my case, there is a very big datatable which stores structured
>> binary data, eg:
>> struct Item
>> {
>>    long id; // used as key
>>    double value;
>> };
>>
>> I want to build the index on "id" field to speed on searching. Since
>> this datatable is not constant, the library should support incremental
>> indexing. If there is no suitable library, I have to do the index by
>> myself...
>
> What about a database?
>
> --
> Gabriel Genellina
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From tomf.sessile at gmail.com  Thu Mar 25 02:50:23 2010
From: tomf.sessile at gmail.com (TomF)
Date: Wed, 24 Mar 2010 23:50:23 -0700
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<pan.2010.03.24.21.07.24@REMOVE.THIS.cybersource.com.au>
Message-ID: <2010032423502316807-tomfsessile@gmailcom>

On 2010-03-24 14:07:24 -0700, Steven D'Aprano 
<steven at REMOVE.THIS.cybersource.com.au> said:
> On Wed, 24 Mar 2010 15:29:07 +0000, kj wrote:
> 
>> Is there a sequence-oriented equivalent to the sum built-in?  E.g.:
>> 
>> seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)
>> 
>> ?
> 
> Yes, sum.
> 
> help(sum) is your friend.

You might not want to be so glib.  The sum doc sure doesn't sound like 
it should work on lists.

    Returns the sum of a sequence of numbers (NOT strings) plus the value
    of parameter 'start' (which defaults to 0).

-Tom



From stefan_ml at behnel.de  Thu Mar 25 03:22:30 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Thu, 25 Mar 2010 08:22:30 +0100
Subject: C-API: Extract information from function object
In-Reply-To: <op.u92zosmwx6zn5v@gabriel.sleipnir-bsas>
References: <b7632ea7-5523-4419-bc6b-b07bb2e6a443@g19g2000yqe.googlegroups.com>
	<op.u92zosmwx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <hof2vk$ctc$1@dough.gmane.org>

Gabriel Genellina, 24.03.2010 17:49:
> En Wed, 24 Mar 2010 12:09:27 -0300, moerchendiser2k3 escribi?:
>
>> I have a reference to a function and would like to know how to extract
>> information from a function object.
>>
>> Information I am looking for: line and file where this function is
>> from.
>>
>> PyObject_Call can do this to when I call a function object and
>> something failed so these information are written to the traceback. So
>> any suggestions how to do that?
>
> See the Language Reference; the associated code object holds the file
> and starting line the function comes from.
> The traceback object contains better information (like the line being
> executed instead of the first one). Why don't you use it instead?

Note that this was a follow-up to another recent thread where I managed to 
extract the details from the OP by stoically asking back, especially the 
information that this is not about exception handling but rather about 
reporting incorrect return values.

This is a good example when you need a reason why not to split threads on 
the same subject...

Stefan



From steven at REMOVE.THIS.cybersource.com.au  Thu Mar 25 03:34:51 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 25 Mar 2010 07:34:51 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<pan.2010.03.24.21.07.24@REMOVE.THIS.cybersource.com.au>
	<2010032423502316807-tomfsessile@gmailcom>
Message-ID: <pan.2010.03.25.07.34.50@REMOVE.THIS.cybersource.com.au>

On Wed, 24 Mar 2010 23:50:23 -0700, TomF wrote:

> On 2010-03-24 14:07:24 -0700, Steven D'Aprano
> <steven at REMOVE.THIS.cybersource.com.au> said:
>> On Wed, 24 Mar 2010 15:29:07 +0000, kj wrote:
>> 
>>> Is there a sequence-oriented equivalent to the sum built-in?  E.g.:
>>> 
>>> seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)
>>> 
>>> ?
>> 
>> Yes, sum.
>> 
>> help(sum) is your friend.
> 
> You might not want to be so glib.  The sum doc sure doesn't sound like
> it should work on lists.
> 
>     Returns the sum of a sequence of numbers (NOT strings) plus the
>     value of parameter 'start' (which defaults to 0).


What part of that suggested to you that sum might not be polymorphic? 
Sure, it says numbers (which should be changed, in my opinion), but it 
doesn't specify what sort of numbers -- ints, floats, or custom types 
that have an __add__ method. It also singles out strings as excluded. Why 
would you need to explicitly exclude strings, since they're not numbers, 
if sum *only* works with numbers?

E.g. help(math.sin) could have said this, but doesn't:

    Return the sine of x (NOT a dictionary)

It doesn't need to, because dicts aren't exceptional: sin doesn't work on 
anything *but* numbers. There's no __sin__ method to call on arbitrary 
types.

The fact that sum does single out strings is a clear sign that strings 
are treated as exceptional and suggests strongly that summing arbitrary 
types should work. I'm not saying that help(sum) explicitly states that 
it works with lists (it clearly doesn't), but it does suggest the 
possibility and makes the experiment worth trying.

I'll also note that the Fine Manual makes it even more clear that sum is 
polymorphic:

http://docs.python.org/library/functions.html#sum




-- 
Steven


From moekaveli at gmail.com  Thu Mar 25 03:41:06 2010
From: moekaveli at gmail.com (Dr. Benjamin David Clarke)
Date: Thu, 25 Mar 2010 00:41:06 -0700 (PDT)
Subject: Saving a page loaded using the webbrowser library?
Message-ID: <3b268d9b-0e37-4e19-9f28-9f560edff76b@b30g2000yqd.googlegroups.com>

Does anyone know of a way to save the a loaded web page to file after
opening it with a webbrowser.open() call?

Specifically, what I want to do is get the raw HTML from a web page.
This web page uses Javascript. I need the resulting HTML after the
Javascript has been run. I've seen a lot about trying to get Python to
run Javascript but there doesn't seem to be any promising solution. I
can get the raw HTML that I want by saving the page after it has been
loaded via the webbrowser.open() call. Is there any way to automate
this? Does anyone have any ideas for better approaches to this
problem? I don't need ti to be pretty or anything.


From irmen at -NOSPAM-xs4all.nl  Thu Mar 25 03:58:28 2010
From: irmen at -NOSPAM-xs4all.nl (Irmen de Jong)
Date: Thu, 25 Mar 2010 08:58:28 +0100
Subject: Is there any library for indexing binary data?
In-Reply-To: <mailman.1168.1269487743.23598.python-list@python.org>
References: <mailman.1168.1269487743.23598.python-list@python.org>
Message-ID: <4bab182a$0$22933$e4fe514c@news.xs4all.nl>

On 3/25/10 4:28 AM, ?? wrote:
> Howdy,
>
> Recently, I am finding a good library for build index on binary data.
> Xapian&  Lucene for python binding focus on text digestion rather than
> binary data. Could anyone give me some recommendation? Is there any
> library for indexing binary data no matter whether it is written in
> python?
>
> In my case, there is a very big datatable which stores structured
> binary data, eg:
> struct Item
> {
>      long id; // used as key
>      double value;
> };
>
> I want to build the index on "id" field to speed on searching. Since
> this datatable is not constant, the library should support incremental
> indexing. If there is no suitable library, I have to do the index by
> myself...
>
> Thank you in advance.
>
> --
> ShenLei

Put it into an Sqlite database? Or something else from 
http://docs.python.org/library/persistence.html.
Or maybe http://www.pytables.org/ is more suitable to your needs (never 
used that one myself though).
Or install a bank or 2 of memory in your box and read everything into 
memory in one big hashtable.

Btw if you already have a big datatable in which the data is stored, I'm 
guessing that already is in some form of database format. Can't you 
write something that understands that database format.

But I think you need to provide some more details about your data set.

-irmen


From no.email at nospam.invalid  Thu Mar 25 04:04:23 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Thu, 25 Mar 2010 01:04:23 -0700
Subject: Is there any library for indexing binary data?
References: <cdb837ea1003242028u7047f346l7d4f405b609b01ff@mail.gmail.com>
	<op.u93v2thgx6zn5v@gabriel.sleipnir-bsas>
	<mailman.1173.1269496428.23598.python-list@python.org>
Message-ID: <7xaatwsu7s.fsf@ruckus.brouhaha.com>

?? <littlesweetmelon at gmail.com> writes:
> Well, Database is not proper because 1. the table is very big (~10^9
> rows) 2. we should support very fast *simple* query that is to get
> value corresponding to single key (~10^7 queries / second).

Just one numeric key/value pair in each row?  What's wrong with
universal hashing?

PyJudy might also be of interest:
  http://www.dalkescientific.com/Python/PyJudy.html


From irmen at -NOSPAM-xs4all.nl  Thu Mar 25 04:13:27 2010
From: irmen at -NOSPAM-xs4all.nl (Irmen de Jong)
Date: Thu, 25 Mar 2010 09:13:27 +0100
Subject: Saving a page loaded using the webbrowser library?
In-Reply-To: <3b268d9b-0e37-4e19-9f28-9f560edff76b@b30g2000yqd.googlegroups.com>
References: <3b268d9b-0e37-4e19-9f28-9f560edff76b@b30g2000yqd.googlegroups.com>
Message-ID: <4bab1bad$0$22941$e4fe514c@news.xs4all.nl>

On 3/25/10 8:41 AM, Dr. Benjamin David Clarke wrote:
> Does anyone know of a way to save the a loaded web page to file after
> opening it with a webbrowser.open() call?
>
> Specifically, what I want to do is get the raw HTML from a web page.
> This web page uses Javascript. I need the resulting HTML after the
> Javascript has been run. I've seen a lot about trying to get Python to
> run Javascript but there doesn't seem to be any promising solution. I
> can get the raw HTML that I want by saving the page after it has been
> loaded via the webbrowser.open() call. Is there any way to automate
> this? Does anyone have any ideas for better approaches to this
> problem? I don't need ti to be pretty or anything.

I think I would use an appropriate GUI automation library to simulate 
user interaction with the web browser that you just started, and e.g. 
select the File > Save page as > HTML only  menu option from the browser...

If the javascript heavily modifies the DOM, that might not work however. 
You might need additional tooling such as Web Developer Toolbar for 
Firefox where you then can View Source > View Generated Source.

irmen



From news1234 at free.fr  Thu Mar 25 04:25:06 2010
From: news1234 at free.fr (News123)
Date: Thu, 25 Mar 2010 09:25:06 +0100
Subject: how to display variables down a stackdump when an exception occurred
Message-ID: <4bab1de2$0$19315$426a34cc@news.free.fr>

Hi,

I captured a piece of code with a try except statement:

In the except part I display a stackdump


try:
	domyxmlrpcstuff()
except Exception as e:
    import traceback
    ex_type,ex_value,e_b = sys.exc_info()
    tbstring = traceback.format_exc()
    print '%s%s:%s:%s' % \
        (msg,ex_type,ex_value,tbstring)


The output, that I receive is:
  File "C:\mycode\myrpcclient.py", line 63, in upload_chunk
    rslt = myrpcclient.call()
  File "C:\Python26\lib\xmlrpclib.py", line 1199, in __call__
    return self.__send(self.__name, args)
  File "C:\Python26\lib\xmlrpclib.py", line 1489, in __request
    verbose=self.__verbose
  File "C:\Python26\lib\xmlrpclib.py", line 1253, in request
    return self._parse_response(h.getfile(), sock)
  File "C:\Python26\lib\xmlrpclib.py", line 1387, in _parse_response
    p.feed(response)
  File "C:\Python26\lib\xmlrpclib.py", line 601, in feed
    self._parser.Parse(data, 0)
ExpatError: syntax error: line 1, column 0

In order to understand more I would like to display the value of
data in C:\Python26\lib\xmlrpclib.py", line 601

Is this possible in a non interactive fashion?

This is a generic question about inspecting variables down the stack,
whenever an exception occurs.

I started another thread specifically about displaying the invalid
xmlrpc data.




N


From news1234 at free.fr  Thu Mar 25 04:31:05 2010
From: news1234 at free.fr (News123)
Date: Thu, 25 Mar 2010 09:31:05 +0100
Subject: xpat error in xmlrp client. How to inspect data.
Message-ID: <4bab1f4a$0$25677$426a74cc@news.free.fr>

Hi,

I'm havign a small xmlrpc client, which works normally fine.
(xmlrpc via https)

Sometimes however I receive an Exception about an expat error.


The output, that I receive is:
  File "C:\mycode\myrpcclient.py", line 63, in upload_chunk
    rslt = myrpcclient.call()
  File "C:\Python26\lib\xmlrpclib.py", line 1199, in __call__
    return self.__send(self.__name, args)
  File "C:\Python26\lib\xmlrpclib.py", line 1489, in __request
    verbose=self.__verbose
  File "C:\Python26\lib\xmlrpclib.py", line 1253, in request
    return self._parse_response(h.getfile(), sock)
  File "C:\Python26\lib\xmlrpclib.py", line 1387, in _parse_response
    p.feed(response)
  File "C:\Python26\lib\xmlrpclib.py", line 601, in feed
    self._parser.Parse(data, 0)
ExpatError: syntax error: line 1, column 0


In order to continue debugging I'd like to dump the received http data,
which "C:\Python26\lib\xmlrpclib.py", line 601 tried to parse without
succes.

How can I do this?

thanks for any suggestions


N




From littlesweetmelon at gmail.com  Thu Mar 25 05:28:25 2010
From: littlesweetmelon at gmail.com (=?GB2312?B?zPC5zw==?=)
Date: Thu, 25 Mar 2010 17:28:25 +0800
Subject: Is there any library for indexing binary data?
In-Reply-To: <7xaatwsu7s.fsf@ruckus.brouhaha.com>
References: <cdb837ea1003242028u7047f346l7d4f405b609b01ff@mail.gmail.com>
	<op.u93v2thgx6zn5v@gabriel.sleipnir-bsas>
	<mailman.1173.1269496428.23598.python-list@python.org>
	<7xaatwsu7s.fsf@ruckus.brouhaha.com>
Message-ID: <cdb837ea1003250228i29f836efwef4f85b936020714@mail.gmail.com>

Thank you Rubin! Let me have a look at Judy. It seems good at first glance.

--
ShenLei

2010/3/25 Paul Rubin <no.email at nospam.invalid>:
> ?? <littlesweetmelon at gmail.com> writes:
>> Well, Database is not proper because 1. the table is very big (~10^9
>> rows) 2. we should support very fast *simple* query that is to get
>> value corresponding to single key (~10^7 queries / second).
>
> Just one numeric key/value pair in each row?  What's wrong with
> universal hashing?
>
> PyJudy might also be of interest:
>  http://www.dalkescientific.com/Python/PyJudy.html
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From tim.wintle at teamrubber.com  Thu Mar 25 05:34:17 2010
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Thu, 25 Mar 2010 09:34:17 +0000
Subject: Is it possible to use re2 from Python?
In-Reply-To: <ad7e9ab9-8b5e-4391-9552-9a006bf058ad@i25g2000yqm.googlegroups.com>
References: <f853ea28-b236-4a17-8ded-43e5fe455d47@a18g2000yqc.googlegroups.com>
	<ad7e9ab9-8b5e-4391-9552-9a006bf058ad@i25g2000yqm.googlegroups.com>
Message-ID: <1269509657.7610.13.camel@localhost>

On Wed, 2010-03-24 at 10:44 -0700, _wolf wrote:
> yes we can! http://github.com/facebook/pyre2

I had made a thin wrapper experiment with here - looks like the version
he's shipped is relatively complete and compatible with the re module
though.

I'll be interested in seeing how well it performs - The wrapper I had
been experimenting with ended up far slower than the re module for
simple expressions - and the fastest codepaths in RE2 seem to be ones
that are incompatible with the API we're used to using in the re module.

Tim



From littlesweetmelon at gmail.com  Thu Mar 25 05:55:27 2010
From: littlesweetmelon at gmail.com (=?GB2312?B?zPC5zw==?=)
Date: Thu, 25 Mar 2010 17:55:27 +0800
Subject: Is there any library for indexing binary data?
In-Reply-To: <4bab182a$0$22933$e4fe514c@news.xs4all.nl>
References: <mailman.1168.1269487743.23598.python-list@python.org>
	<4bab182a$0$22933$e4fe514c@news.xs4all.nl>
Message-ID: <cdb837ea1003250255u3d08b8f6n3eb5a6c343573920@mail.gmail.com>

Thank you irmen. I will take a look at pytable.
FYI, let me explain the case clearly.

Originally, my big data table is simply array of Item:
struct Item
{
    long id;    // used as key
    BYTE payload[LEN];   // corresponding value with fixed length
};

All items are stored in one file by using "stdio.h" function:
    fwrite(itemarray, sizeof(Item), num_of_items, fp);

Note that "id" is randomly unique without any order. To speed up
searching  I regrouped / sorted them into two-level hash tables (in
the form of files).  I want to employ certain library to help me index
this table.

Since the table contains about 10^9 items and LEN is about 2KB, it is
impossible to hold all data in memory. Furthermore, some new item may
be inserted into the array. Therefore incremental indexing feature is
needed.

Hope this help you to understand my case.

--
ShenLei


2010/3/25 Irmen de Jong <irmen at -nospam-xs4all.nl>:
> On 3/25/10 4:28 AM, ?? wrote:
>>
>> Howdy,
>>
>> Recently, I am finding a good library for build index on binary data.
>> Xapian&  Lucene for python binding focus on text digestion rather than
>> binary data. Could anyone give me some recommendation? Is there any
>> library for indexing binary data no matter whether it is written in
>> python?
>>
>> In my case, there is a very big datatable which stores structured
>> binary data, eg:
>> struct Item
>> {
>>     long id; // used as key
>>     double value;
>> };
>>
>> I want to build the index on "id" field to speed on searching. Since
>> this datatable is not constant, the library should support incremental
>> indexing. If there is no suitable library, I have to do the index by
>> myself...
>>
>> Thank you in advance.
>>
>> --
>> ShenLei
>
> Put it into an Sqlite database? Or something else from
> http://docs.python.org/library/persistence.html.
> Or maybe http://www.pytables.org/ is more suitable to your needs (never used
> that one myself though).
> Or install a bank or 2 of memory in your box and read everything into memory
> in one big hashtable.
>
> Btw if you already have a big datatable in which the data is stored, I'm
> guessing that already is in some form of database format. Can't you write
> something that understands that database format.
>
> But I think you need to provide some more details about your data set.
>
> -irmen
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From mail at timgolden.me.uk  Thu Mar 25 05:57:23 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Thu, 25 Mar 2010 09:57:23 +0000
Subject: threads (specifically timers) and releasing resources
In-Reply-To: <bc7f680c1003241931v4ec88d15ge5639d96834c1db5@mail.gmail.com>
References: <bc7f680c1003241931v4ec88d15ge5639d96834c1db5@mail.gmail.com>
Message-ID: <4BAB3383.7080003@timgolden.me.uk>

On 25/03/2010 02:31, Alex Hall wrote:
> Okay, I have my program and it has three different modes (there will
> be more than that). Each mode will have a timer attached to it. If the
> mode remains active and the timer runs out, a function specific to
> that mode is called. If that mode is switched away from, however, the
> timer is canceled and a new timer is created for the mode to which the
> user just switched.

I assume you're using Python's threading.Timer objects as you'd discussed
those before. If so, that's basically a threading.Thread in disguise.
In which case, you're going to have to make sure it cleans up after itself,
releasing whatever resources it holds.

Python's reference-count semantics and cyclic gc will take care of
things in the normal way once the timer-thread has completed. But
you'll have to make sure it completes.

> If the latter, is there a way to completely destroy a thread?

No: in Python, a thread has to self-destruct. This is a relatively
FAQ and there are quite a few recipes around. Here's an example of
something which seems to be close to your current needs:

http://code.activestate.com/recipes/464959-resettable-timer-class/

TJG


From egbertum at xs4all.nl  Thu Mar 25 06:16:32 2010
From: egbertum at xs4all.nl (egbert)
Date: Thu, 25 Mar 2010 11:16:32 +0100
Subject: from import and __init__.py
Message-ID: <20100325101632.GA4727@xs4all.nl>

When I do 'from some_package import some_module'
the __init__.py of some_package will be run.
However, there will not be anything like a  package-module, 
and the effects of __init__.py seem all to be lost. Is that true ?
Or can I still do something useful with __init__.py ?  
e
-- 
Egbert Bouwman - Keizersgracht 197 II - 1016 DS  Amsterdam - 020 6257991
========================================================================


From rami.chowdhury at gmail.com  Thu Mar 25 07:10:33 2010
From: rami.chowdhury at gmail.com (Rami Chowdhury)
Date: Thu, 25 Mar 2010 04:10:33 -0700
Subject: the Python Foundation
In-Reply-To: <7xwrx1z4nq.fsf@ruckus.brouhaha.com>
References: <70db60af-cad4-4385-b199-e181f1e39898@b7g2000yqd.googlegroups.com>
	<mailman.1159.1269465542.23598.python-list@python.org>
	<7xwrx1z4nq.fsf@ruckus.brouhaha.com>
Message-ID: <20100325111033.GB18576@tigris>

On 2010-03-24 16:22, Paul Rubin wrote:
> "Steve Holden, Chairman, PSF" <chairman at python.org> writes:
> > We have also registered the trademark "Python" for use in reference to
> > computer programming languages, thereby ensuring that we can take action
> > should some ill-advised individual or organization decide to produce
> > another language with "Python" in its name
> 
> There has been a Lisp compiler called "Python" for many years:
> 
>  http://portal.acm.org/citation.cfm?id=141471.141558

The FAQ disclaims any connection and claims that Python the Lisp
compiler has been around longer than Python the language...

http://www.cons.org/cmucl/FAQ.html

I was awfully confused the first time I came across SBCL giving me warnings
about Python, though -- proves how well the PSF has safeguarded the name!

> -- 
> http://mail.python.org/mailman/listinfo/python-list


From newton10471 at gmail.com  Thu Mar 25 07:42:08 2010
From: newton10471 at gmail.com (newton10471)
Date: Thu, 25 Mar 2010 04:42:08 -0700 (PDT)
Subject: chroot fails with mount point passed to subprocess.Popen?
References: <6a601e7c-7a89-4747-a25c-a78743fe47ab@g4g2000yqa.googlegroups.com>
	<ho7rjf$lki$1@news.eternal-september.org>
Message-ID: <0bbff19b-1cb1-40bb-950c-7594d0eba6cc@r1g2000yqj.googlegroups.com>

Hi Alf,

After doing some more research, including the character-by-character
comparison you suggested (thank you!), I was able to get things
working the way I wanted using the following:

def getInstalledKernelVersion(mountPoint):
    linuxFsRoot = mountPoint + "/root"
    installedKernelVersionResult = subprocess.Popen(['/usr/sbin/
chroot',linuxFsRoot,'/bin/rpm','-q','kernel-xen'],
stdout=subprocess.PIPE).communicate()[0]
    return installedKernelVersionResult


Thanks very much for you help,

-Matt


On Mar 22, 9:33?am, "Alf P. Steinbach" <al... at start.no> wrote:
> * newton10471:
>
>
>
> > Hi,
>
> > I'm trying to use subprocess.Popen() to do a Linux chroot to a mount
> > point passed in as a parameter to the following function:
>
> > def getInstalledKernelVersion(mountPoint):
> > ? ? linuxFsRoot = mountPoint + "/root"
> > ? ? print "type of linuxFsRoot is %s" % type(linuxFsRoot)
> > ? ? installedKernelVersionResult =
> > subprocess.Popen(['chroot',linuxFsRoot,'rpm','-q','kernel-xen'])
> > ? ? return installedKernelVersionResult
>
> > and it dies with the following:
>
> > type of linuxFsRoot is <type 'str'>
> > chroot: cannot change root directory to /storage/mounts/
> > mnt_3786314034939740895.mnt/root: No such file or directory
>
> > When I explicitly set linuxFsRoot = "/storage/mounts/
> > mnt_3786314034939740895.mnt/root", it works fine.
>
> > I also tried this to concatenate the mountpoint + /root, and it failed
> > in the same way:
>
> > linuxFsRoot = ("%s/root") % mountPoint
>
> Use the os.path functions.
>
> > Anyone know what might be happening here?
>
> Since the computed and literal paths /look/ identical and same type, the only
> thing I can imagine is that there is some invisible character. Try comparing the
> computed and literal path character by character. Print the difference or if
> they're identical, that they are.
>
> Possibly you have GIGO problem.
>
> Cheers & hth.,
>
> - Alf



From steve at holdenweb.com  Thu Mar 25 07:42:20 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 25 Mar 2010 07:42:20 -0400
Subject: from import and __init__.py
In-Reply-To: <20100325101632.GA4727@xs4all.nl>
References: <20100325101632.GA4727@xs4all.nl>
Message-ID: <hofi7f$u0f$1@dough.gmane.org>

egbert wrote:
> When I do 'from some_package import some_module'
> the __init__.py of some_package will be run.
> However, there will not be anything like a  package-module, 
> and the effects of __init__.py seem all to be lost. Is that true ?
> Or can I still do something useful with __init__.py ?  
> e

If I understand correctly what you mean byt a "package-module" then
__init__.py is exactly what you are looking for.

Many packages are built with an empty __init__.py because they are
intended mostly to build a tree-like set of namespaces, but __init__.py
*is* run when the package is imported, and its namespace is bound to the
name of the package within the importing program. So if you have code
you want to run when the package is imported, put it there.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From newton10471 at gmail.com  Thu Mar 25 07:42:22 2010
From: newton10471 at gmail.com (newton10471)
Date: Thu, 25 Mar 2010 04:42:22 -0700 (PDT)
Subject: chroot fails with mount point passed to subprocess.Popen?
References: <6a601e7c-7a89-4747-a25c-a78743fe47ab@g4g2000yqa.googlegroups.com>
	<ho7rjf$lki$1@news.eternal-september.org>
Message-ID: <73728874-ff0a-4360-a328-50fc19236bf6@d27g2000yqf.googlegroups.com>

Hi Alf,

After doing some more research, including the character-by-character
comparison you suggested (thank you!), I was able to get things
working the way I wanted using the following:

def getInstalledKernelVersion(mountPoint):
    linuxFsRoot = mountPoint + "/root"
    installedKernelVersionResult = subprocess.Popen(['/usr/sbin/
chroot',linuxFsRoot,'/bin/rpm','-q','kernel-xen'],
stdout=subprocess.PIPE).communicate()[0]
    return installedKernelVersionResult


Thanks very much for you help,

-Matt


On Mar 22, 9:33?am, "Alf P. Steinbach" <al... at start.no> wrote:
> * newton10471:
>
>
>
> > Hi,
>
> > I'm trying to use subprocess.Popen() to do a Linux chroot to a mount
> > point passed in as a parameter to the following function:
>
> > def getInstalledKernelVersion(mountPoint):
> > ? ? linuxFsRoot = mountPoint + "/root"
> > ? ? print "type of linuxFsRoot is %s" % type(linuxFsRoot)
> > ? ? installedKernelVersionResult =
> > subprocess.Popen(['chroot',linuxFsRoot,'rpm','-q','kernel-xen'])
> > ? ? return installedKernelVersionResult
>
> > and it dies with the following:
>
> > type of linuxFsRoot is <type 'str'>
> > chroot: cannot change root directory to /storage/mounts/
> > mnt_3786314034939740895.mnt/root: No such file or directory
>
> > When I explicitly set linuxFsRoot = "/storage/mounts/
> > mnt_3786314034939740895.mnt/root", it works fine.
>
> > I also tried this to concatenate the mountpoint + /root, and it failed
> > in the same way:
>
> > linuxFsRoot = ("%s/root") % mountPoint
>
> Use the os.path functions.
>
> > Anyone know what might be happening here?
>
> Since the computed and literal paths /look/ identical and same type, the only
> thing I can imagine is that there is some invisible character. Try comparing the
> computed and literal path character by character. Print the difference or if
> they're identical, that they are.
>
> Possibly you have GIGO problem.
>
> Cheers & hth.,
>
> - Alf



From dksreddy at gmail.com  Thu Mar 25 08:15:54 2010
From: dksreddy at gmail.com (Sandy)
Date: Thu, 25 Mar 2010 05:15:54 -0700 (PDT)
Subject: cxfreeze on ubuntu 9.10
References: <84719a38-3d00-4d46-aa11-f0dca7ace71c@q15g2000yqj.googlegroups.com>
Message-ID: <0a385e57-7564-47e1-ab4b-0c75de8ce0d2@r27g2000yqn.googlegroups.com>

I used cxFreeze without any problem on Ubuntu 9.10 32 bit version. I
tried it on a wxPython gui script and
it works fine though I did'n use any setup file.
Just try cxFreeze executable (should be in /usr/bin/) instead of setup
file.

$/usr/bin/cxFreeze my_script.py --target-dir=/what_ever_dir/

what_ever_dir will have the executable file and other libraries needed
to run the executable.

- dksr


On Mar 25, 12:33?am, Waspinator <patrickw... at gmail.com> wrote:
> Hi,
>
> I'm trying to compile a python script on Ubuntu 9.10. It uses the gtk
> toolkit. I tried to run GUI2EXE for a cxfreeze gui, but even after
> installing wxPython in synaptic it still complains about not having
> it.
>
> I also tried to use cxfreeze by itself but the file it produces does
> not run.
>
> I tried to follow the information athttp://cx-freeze.sourceforge.net/cx_Freeze.html
>
> I created a setup.py file that looks like this (from the page)
>
> from cx_Freeze import setup, Executable
>
> setup(
> ? ? ? ? name = "gtk_test",
> ? ? ? ? version = "0.1",
> ? ? ? ? description = "gtk_test",
> ? ? ? ? executables = [Executable("gtk_test.py")])
>
> and ran:
>
> python setup.py build
>
> When I try to run the executable I get the following error:
>
> ../build/exe.linux-i686-2.6/library.zip/gtk/_gtk.py:12:
> RuntimeWarning: tp_compare didn't return -1 or -2 for exception
> ImportError: could not import gio
> ImportError: could not import gio
> Traceback (most recent call last):
> ? File "/usr/lib/pymodules/python2.6/cx_Freeze/initscripts/
> Console.py", line 29, in <module>
> ? ? exec code in m.__dict__
> ? File "gtk_test.py", line 274, in <module>
> ? File "gtk_test.py", line 228, in main
> AttributeError: 'module' object has no attribute 'Window'
>
> I was thinking of using the 'copy-dependent-files' option but I'm not
> sure how.
>
> Any ideas?
>
> Thanks



From ethan at stoneleaf.us  Thu Mar 25 08:28:22 2010
From: ethan at stoneleaf.us (Ethan Furman)
Date: Thu, 25 Mar 2010 05:28:22 -0700
Subject: Advanced Python Programming Oxford Lectures [was: Re: *Advanced*
	Python book?]
In-Reply-To: <dc17e529-2688-4dbe-a7dc-54535ac940bc@g3g2000pre.googlegroups.com>
References: <mailman.7404.1232137641.3487.python-list@python.org>
	<dc17e529-2688-4dbe-a7dc-54535ac940bc@g3g2000pre.googlegroups.com>
Message-ID: <4BAB56E6.2070201@stoneleaf.us>

Michele Simionato wrote:
> On Jan 16, 9:27 pm, mk <mrk... at gmail.com> wrote:
> 
>>Hello everyone,
>>
>>I looked for it I swear, but just can't find it.
>>
>>Most Python books seem to focus on examples of how to call functions
>>from standard library. I don't need that, I have online Python
>>documentation for that.
>>
>>I mean really advanced mental gymnastics, like gory details of how
>>Python objects operate, how to exploit its dynamic capabilities, dos and
>>donts with particular Python objects, advanced tricks, everything from
>>chained decorators to metaprogramming. Dive Into Python comes closest to
>>this ideal from what I have found, but still not far enough.
>>
>>Anybody found such holy grail?
> 
> "Expert Python Programming" by Tarek Ziad? is quite good and I wrote
> a review for it:
> 
> http://www.artima.com/weblogs/viewpost.jsp?thread=240415
> 
> There is plenty of info about Advanced Python on the net, much more
> than in book form. Come to think of it, there are my Oxford lectures
> (the title was exactly "Advanced Python Programming") and I could
> republish it on my blog, since I cannot find them on the net anymore.
> 
>            Michele Simionato

Michele,

Was wondering if you'd had a chance to re-post your lectures -- just did 
a search for them and came up empty, and I would love to read them!

Many thanks in advance!

~Ethan~


From neilc at norwich.edu  Thu Mar 25 08:37:14 2010
From: neilc at norwich.edu (Neil Cerutti)
Date: 25 Mar 2010 12:37:14 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<pan.2010.03.24.21.07.24@REMOVE.THIS.cybersource.com.au>
	<2010032423502316807-tomfsessile@gmailcom>
	<pan.2010.03.25.07.34.50@REMOVE.THIS.cybersource.com.au>
Message-ID: <8113nqFsggU3@mid.individual.net>

On 2010-03-25, Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:
>> You might not want to be so glib.  The sum doc sure doesn't
>> sound like it should work on lists.
>> 
>>     Returns the sum of a sequence of numbers (NOT strings) plus the
>>     value of parameter 'start' (which defaults to 0).
>
> What part of that suggested to you that sum might not be polymorphic? 
> Sure, it says numbers (which should be changed, in my opinion), but it 
> doesn't specify what sort of numbers -- ints, floats, or custom types 
> that have an __add__ method.

WTF.

-- 
Neil Cerutti
"It's not fun to build walls. But it's even less fun to live
without walls in a world full of zombies." --Greedy Goblin


From stefan_ml at behnel.de  Thu Mar 25 08:44:35 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Thu, 25 Mar 2010 13:44:35 +0100
Subject: sum for sequences?
In-Reply-To: <8113nqFsggU3@mid.individual.net>
References: <hodb43$pt$1@reader1.panix.com>	<pan.2010.03.24.21.07.24@REMOVE.THIS.cybersource.com.au>	<2010032423502316807-tomfsessile@gmailcom>	<pan.2010.03.25.07.34.50@REMOVE.THIS.cybersource.com.au>
	<8113nqFsggU3@mid.individual.net>
Message-ID: <hoflri$dnp$1@dough.gmane.org>

Neil Cerutti, 25.03.2010 13:37:
> On 2010-03-25, Steven D'Aprano wrote:
>>> You might not want to be so glib.  The sum doc sure doesn't
>>> sound like it should work on lists.
>>>
>>>      Returns the sum of a sequence of numbers (NOT strings) plus the
>>>      value of parameter 'start' (which defaults to 0).
>>
>> What part of that suggested to you that sum might not be polymorphic?
>> Sure, it says numbers (which should be changed, in my opinion), but it
>> doesn't specify what sort of numbers -- ints, floats, or custom types
>> that have an __add__ method.
>
> WTF.

Warning: truth found!

Stefan



From python at hope.cz  Thu Mar 25 08:45:21 2010
From: python at hope.cz (Johny)
Date: Thu, 25 Mar 2010 05:45:21 -0700 (PDT)
Subject: Does a tiny Python distribution exist?
Message-ID: <29c82125-10ce-4302-9423-c8b92a7911f9@q23g2000yqd.googlegroups.com>

Does anyone know if there is a tiny Python distribution available
running in a Linux environment?


From alfps at start.no  Thu Mar 25 09:02:05 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Thu, 25 Mar 2010 14:02:05 +0100
Subject: sum for sequences?
In-Reply-To: <8113nqFsggU3@mid.individual.net>
References: <hodb43$pt$1@reader1.panix.com>
	<pan.2010.03.24.21.07.24@REMOVE.THIS.cybersource.com.au>
	<2010032423502316807-tomfsessile@gmailcom>
	<pan.2010.03.25.07.34.50@REMOVE.THIS.cybersource.com.au>
	<8113nqFsggU3@mid.individual.net>
Message-ID: <hofmom$vkk$1@news.eternal-september.org>

* Neil Cerutti:
> On 2010-03-25, Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:
>>> You might not want to be so glib.  The sum doc sure doesn't
>>> sound like it should work on lists.
>>>
>>>     Returns the sum of a sequence of numbers (NOT strings) plus the
>>>     value of parameter 'start' (which defaults to 0).
>> What part of that suggested to you that sum might not be polymorphic? 
>> Sure, it says numbers (which should be changed, in my opinion), but it 
>> doesn't specify what sort of numbers -- ints, floats, or custom types 
>> that have an __add__ method.
> 
> WTF.

I think Steven's argument is that it would be pointless for 'sum' to distinguish 
between user-defined numerical types and other types that happen to support '+'.

It could make such a distinction since there's a type hierarchy for numbers, but 
then that should IMHO be more clearly documented.

However, given that it isn't restricted to numbers, the restriction wrt. strings 
is a bit perplexing in the context of modern CPython. But for Python 
implementations that don't offer the '+=' optimization it might help to avoid 
gross inefficiencies, namely quadratic time string concatenation. E.g., here's a 
natural implementation of sum  --  with unoptimized '+=' yielding quadratic time 
for the string concatenation (with modern CPython it's linear time, though):

<example>
   >>> def sum_all( values, start = 0 ):
   ...     s = start
   ...     for v in values: s += v
   ...     return s
   ...
   >>> sum_all( (1, 2, 3, 4) )
   10
   >>> sum_all( ("a", "b", "c", "d"), "" )
   'abcd'
   >>> sum_all( ((1, 2), (3, 4), (5, 6)), () )
   (1, 2, 3, 4, 5, 6)
   >>> _
</example>

However, if that hypothesis about the rationale is correct, then 'sum' should 
also be restricted to not handle tuples or lists, so forth, but at least the 
CPython implementation does.

So perhaps the documentation needs to be more clear?


Cheers,

- Alf


From icanbob at gmail.com  Thu Mar 25 09:17:34 2010
From: icanbob at gmail.com (bobicanprogram)
Date: Thu, 25 Mar 2010 06:17:34 -0700 (PDT)
Subject: Advice needed on parallel processing in python
References: <0a050a71-8ff1-4393-aba9-9115eb38cbec@q21g2000yqm.googlegroups.com>
	<ffc29248-7f1f-4bb7-85c8-f118806fd7d4@e7g2000yqf.googlegroups.com>
Message-ID: <ac04323b-8a35-4c92-a0dc-846137e7869f@19g2000yqu.googlegroups.com>

On Mar 24, 1:13 pm, Jon Clements <jon... at googlemail.com> wrote:
> On 24 Mar, 15:27, Glazner <yoavglaz... at gmail.com> wrote:
>
>
>
> > Hi!
>
> > I need to replace an app that does number crunching over a local
> > network.
> > it have about 50 computers as slaves
> > each computer needs to run COM that will do the "job"
> > right now the system uses MFC threads and DCOM to distribute the load.
>
> > as i said, Now i'm trying to replace this system with python.
> > I already use win32all and read about Pareller Python and Pyro.
>
> > a requirement is that messages can be sent to the remote worker.
>
> > If anyone can share experience I'll love to hear
>
> > Many Thanks,
> > Yoav Glazner
>
> Would Celery suit?http://celeryproject.org/
>
> hth
>
> Jon.


If you can add just one Linux server onto that network you could use
SIMPL-Python to do what you want.

http://www.icanprogram.com/06py/lesson1/lesson1.html

ie. SIMPL messages going seamlessly from Python (Windows) to Python
(Windows) with the SIMPL sandbox being hosted on the Linux node.

Of course if you wanted to add Linux nodes as processing nodes.
Python (Windows) modules could seamlessly exchange messages with those
as well.  Same would be true if you wanted to distribute part of your
app into the cloud.  All your Python code would look virtually
identical in each of these cases.

As an example of an inexpensive Linux node the SIMPL toolkit has been
ported to the ~$100 Sheeva Plug computer (http://www.icanprogram.com/
simpl/plugsimplbin.self.html)  (http://www.plugcomputer.org).

bob


From icanbob at gmail.com  Thu Mar 25 09:22:14 2010
From: icanbob at gmail.com (bobicanprogram)
Date: Thu, 25 Mar 2010 06:22:14 -0700 (PDT)
Subject: Python is cool!!
References: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
Message-ID: <05932144-af1d-4369-8999-50ca5575ae20@z4g2000yqa.googlegroups.com>

On Mar 23, 11:55 am, Jose Manuel <jfernan... at gmail.com> wrote:
> I have been learning Python, and it is amazing .... I am using the
> tutorial that comes with the official distribution.
>
> At the end my goal is to develop applied mathematic in engineering
> applications to be published on the Web, specially on app. oriented to
> simulations and control systems, I was about to start learning Java
> but I found Python which seems easier to learn that Java.
>
> Would it be easy to integrate Python in Web pages with HTML? I have
> read many info on Internet saying it is, and I hope so ....
>
> Any opinion


You probably want to take a look at this tutorial as well:

http://www.icanprogram.com/06py/lesson1/lesson1.html

The SIMPL toolkit will give you added flexibility to choose the
language for some of your more computationally intensive simulations
and still present a unified Python interface to the whole thing.

bob


From michele.simionato at gmail.com  Thu Mar 25 09:24:04 2010
From: michele.simionato at gmail.com (Michele Simionato)
Date: Thu, 25 Mar 2010 06:24:04 -0700 (PDT)
Subject: Advanced Python Programming Oxford Lectures [was: Re: *Advanced* 
	Python book?]
References: mailman.1182.1269520510.23598.python-list@python.org
Message-ID: <54e41616-df9f-42dd-9c91-9e530650bd99@j21g2000yqh.googlegroups.com>

On Mar 25, 1:28?pm, Ethan Furman <et... at stoneleaf.us> wrote:
>
> Michele,
>
> Was wondering if you'd had a chance to re-post your lectures -- just did
> a search for them and came up empty, and I would love to read them!
>
> Many thanks in advance!

Oops, I forgot! I will try to make them available soon.


From bruno.42.desthuilliers at websiteburo.invalid  Thu Mar 25 10:02:18 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 25 Mar 2010 15:02:18 +0100
Subject: Advice Criticism on Python App
In-Reply-To: <pan.2010.03.25.05.10.05@REMOVE.THIS.cybersource.com.au>
References: <de18cb49-b0fd-4862-b9af-3743720e0db6@u19g2000prh.googlegroups.com>	<uholq5peen08i78f968juvhskpedhhnlr3@4ax.com>
	<pan.2010.03.25.05.10.05@REMOVE.THIS.cybersource.com.au>
Message-ID: <4bab6cd6$0$9118$426a74cc@news.free.fr>

Steven D'Aprano a ?crit :
> On Wed, 24 Mar 2010 21:14:23 -0700, Tim Roberts wrote:
> 
>> Jimbo <nilly16 at yahoo.com> wrote:
>>> class stock:
>>>    code             = ""
>>>    purchasePrice    = 0
>>>    purchaseQuantity = 0
>>>    price            = []  # list of recent prices 
>>>    recentBid        = []  # list of recent bids for stock
>>>    recentOffer      = []  # list of recent offers for stock
>>>    stockVol         = []  # list of stock quantity available on market
>> Using lists as class variables is a very good way to create very
>> surprising bugs.  Consider the following:
> [snip]
> 
> 
> Don't you think that the class attributes are *supposed* to be shared by 
> all instances? In that case the behaviour you show is not a bug at all.

Python's class attributes are indeed supposed to be shared - that's even 
the whole point of having class attributes.

But this feature has proven to be confusing for newcomers that more 
often than not have previous exposure to OOPLs where you do "declare" 
your class "schema" at the class level (where Python defines class 
attributes).

Now reread the OP's code, and you'll find out he's indeed yet another 
victim of this gotcha:

"""
     for row in cur.fetchall():
         newStock = stock()
         newStock.code             = row[0]
         newStock.purchasePrice    = row[1]
         newStock.purchaseQuantity = row[2]
         cur.execute(stockQuery,[newStock.code])
         for rw in cur.fetchall():
             newStock.price.append(rw[0])
             newStock.recentOffer.append(rw[1])
             newStock.recentBid.append(rw[2])
             newStock.stockVol.append(rw[3])
        stockList.append(newStock)
"""


From mehgcap at gmail.com  Thu Mar 25 10:38:36 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Thu, 25 Mar 2010 10:38:36 -0400
Subject: threads (specifically timers) and releasing resources
In-Reply-To: <4BAB3383.7080003@timgolden.me.uk>
References: <bc7f680c1003241931v4ec88d15ge5639d96834c1db5@mail.gmail.com>
	<4BAB3383.7080003@timgolden.me.uk>
Message-ID: <bc7f680c1003250738n47ab72a5xa4aad8175c4ff6ce@mail.gmail.com>

Thanks, this should work.

On 3/25/10, Tim Golden <mail at timgolden.me.uk> wrote:
> On 25/03/2010 02:31, Alex Hall wrote:
>> Okay, I have my program and it has three different modes (there will
>> be more than that). Each mode will have a timer attached to it. If the
>> mode remains active and the timer runs out, a function specific to
>> that mode is called. If that mode is switched away from, however, the
>> timer is canceled and a new timer is created for the mode to which the
>> user just switched.
>
> I assume you're using Python's threading.Timer objects as you'd discussed
> those before. If so, that's basically a threading.Thread in disguise.
> In which case, you're going to have to make sure it cleans up after itself,
> releasing whatever resources it holds.
>
> Python's reference-count semantics and cyclic gc will take care of
> things in the normal way once the timer-thread has completed. But
> you'll have to make sure it completes.
>
>> If the latter, is there a way to completely destroy a thread?
>
> No: in Python, a thread has to self-destruct. This is a relatively
> FAQ and there are quite a few recipes around. Here's an example of
> something which seems to be close to your current needs:
>
> http://code.activestate.com/recipes/464959-resettable-timer-class/
>
> TJG
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From bruno.42.desthuilliers at websiteburo.invalid  Thu Mar 25 11:01:51 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 25 Mar 2010 16:01:51 +0100
Subject: Python is cool!!
In-Reply-To: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
References: <09813819-e3d3-4998-85e0-71fce5992227@u9g2000yqb.googlegroups.com>
Message-ID: <4bab7acb$0$2873$426a74cc@news.free.fr>

Jose Manuel a ?crit :
> I have been learning Python, and it is amazing .... I am using the
> tutorial that comes with the official distribution.
> 
> At the end my goal is to develop applied mathematic in engineering
> applications to be published on the Web, specially on app. oriented to
> simulations and control systems, I was about to start learning Java
> but I found Python which seems easier to learn that Java.

Python is indeed quite lightweight when compared to Java. But it has 
it's share of non-obvious features, dark corners, gotchas, and plain 
warts too.

> Would it be easy to integrate Python in Web pages with HTML? I have
> read many info on Internet saying it is, and I hope so ....

If you think of some server-page PHP-like solution, you won't find much 
usable stuff. There are quite a few Python web development toolkits / 
frameworks, but Django is becoming the de facto standard. Arguably not 
the "best" framework (depending on your definition of "best"), but 
certainly one of the most pythonic and well documented around.


From fpm at u.washington.edu  Thu Mar 25 11:10:59 2010
From: fpm at u.washington.edu (cassiope)
Date: Thu, 25 Mar 2010 08:10:59 -0700 (PDT)
Subject: Does a tiny Python distribution exist?
References: <29c82125-10ce-4302-9423-c8b92a7911f9@q23g2000yqd.googlegroups.com>
Message-ID: <25d0272d-1a49-40e0-96ac-6c8d431b0c18@c20g2000prb.googlegroups.com>

On Mar 25, 5:45?am, Johny <pyt... at hope.cz> wrote:
> Does anyone know if there is a tiny Python distribution available
> running in a Linux environment?

Debian has a package: "python-minimal".

HTH...


From omrihsan at gmail.com  Thu Mar 25 11:23:46 2010
From: omrihsan at gmail.com (Omer Ihsan)
Date: Thu, 25 Mar 2010 08:23:46 -0700 (PDT)
Subject: nested threading
Message-ID: <4566e767-768f-4399-8a6b-5530ec90b03c@a37g2000prd.googlegroups.com>

is there anything as "nested threading"....that is, call a thread from
within a thread.
in this case how will thread locking take place.

for example initially there were two functions that were called using
threading.Thread. these wont get unlocked unless both of them are done
with whatever they need to do. if say function 2 calls another thread.
then what??

inquisitive....:-|


From mail at timgolden.me.uk  Thu Mar 25 11:25:46 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Thu, 25 Mar 2010 15:25:46 +0000
Subject: Does a tiny Python distribution exist?
In-Reply-To: <25d0272d-1a49-40e0-96ac-6c8d431b0c18@c20g2000prb.googlegroups.com>
References: <29c82125-10ce-4302-9423-c8b92a7911f9@q23g2000yqd.googlegroups.com>
	<25d0272d-1a49-40e0-96ac-6c8d431b0c18@c20g2000prb.googlegroups.com>
Message-ID: <4BAB807A.7040104@timgolden.me.uk>

On 25/03/2010 15:10, cassiope wrote:
> On Mar 25, 5:45 am, Johny<pyt... at hope.cz>  wrote:
>> Does anyone know if there is a tiny Python distribution available
>> running in a Linux environment?
>
> Debian has a package: "python-minimal".
>
> HTH...

tinypy?

http://www.tinypy.org/

TJG


From jason.heeris at gmail.com  Thu Mar 25 11:39:01 2010
From: jason.heeris at gmail.com (Jason)
Date: Thu, 25 Mar 2010 08:39:01 -0700 (PDT)
Subject: Represent object type as
Message-ID: <6a6a37e3-f04f-4b63-9134-7ca9fd137297@f14g2000pre.googlegroups.com>

Hi,

I want to send objects (new style) over DBUS. DBUS can only send
fairly primitive types[1] so I turn my objects into dicts and send
that. I'm reusing the __getstate__ function I wrote for pickling like
so:

    def __getstate__(self):
        attrs = self.__dict__.copy()
        return attrs

...which is perfectly adequate to dict-ify and reconstitute this
simple class. That works just fine over DBUS.

The trouble is, the object could actually be of some slightly
different types, so I'd like to include that information as well. I
tried something like:

    def __getstate__(self):
        attrs = self.__dict__.copy()
        attrs.update({'type': type(self)})
        return attrs

...but then realised that "type" is not primitive enough for DBUS to
pickle.

So, (a) can I get the type name from the type object, or (b) is there
a better way to do this?

(This pertains to Python 2.5.4.)

Cheers,
? Jason

[1] http://dbus.freedesktop.org/doc/dbus-python/doc/tutorial.html#data-types


From bruno.42.desthuilliers at websiteburo.invalid  Thu Mar 25 12:00:34 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Thu, 25 Mar 2010 17:00:34 +0100
Subject: Represent object type as
In-Reply-To: <6a6a37e3-f04f-4b63-9134-7ca9fd137297@f14g2000pre.googlegroups.com>
References: <6a6a37e3-f04f-4b63-9134-7ca9fd137297@f14g2000pre.googlegroups.com>
Message-ID: <4bab888e$0$26553$426a74cc@news.free.fr>

Jason a ?crit :
> Hi,
> 
> I want to send objects (new style) over DBUS. DBUS can only send
> fairly primitive types[1] so I turn my objects into dicts and send
> that. I'm reusing the __getstate__ function I wrote for pickling like
> so:
> 
>     def __getstate__(self):
>         attrs = self.__dict__.copy()
>         return attrs
> 
> ...which is perfectly adequate to dict-ify and reconstitute this
> simple class. That works just fine over DBUS.
> 
> The trouble is, the object could actually be of some slightly
> different types, so I'd like to include that information as well. I
> tried something like:
> 
>     def __getstate__(self):
>         attrs = self.__dict__.copy()
>         attrs.update({'type': type(self)})

           attrs['type'] = type(self)

Do the same thing with less work !-)

Also and while we're at it, using a __magicname__ convention here (ie : 
'__type__' instead of 'type') might avoid possible collisions.

>         return attrs
> 
> ...but then realised that "type" is not primitive enough for DBUS to
> pickle.
> 
> So, (a) can I get the type name from the type object,

     attrs['__typename__'] = type(self).__name__


Warning: won't be very useful if your code still uses old-style classes.

> or (b) is there
> a better way to do this?

Depends on what you do with this dict, DBUS etc. And of your definition 
of "better", of course.


HTH


From sccolbert at gmail.com  Thu Mar 25 12:23:47 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Thu, 25 Mar 2010 12:23:47 -0400
Subject: ANN: Pymazon 0.1.1 Released
Message-ID: <7f014ea61003250923k50d1fc60h108f83c01c15478b@mail.gmail.com>

I'm happy to announce the release of Pymazon 0.1.1!

This release brings a big enhancement in the form of PyGtk support in
addition to the PyQt4 and Command line interfaces already available.
A special thanks to Ray Meyers for his gtk commits!

Pymazon Changelog

0.1.1
-----
- Added support for command line options and configuration file
- Added support for save name templates
- Added a threaded downloader which runs a user-specified simultaneous
threads when in gui mode
- Added a PyGtk Gui (Submitted by Raymond Myers)
- Rewrote the QT Gui with Qt Designer and pyuic4 - this simplified and
cleaned up a bunch of stuff
- Added graphical progress bars to the Gui's
- Removed a check that asserted the downloaded file size was the same as
specified in the amz file
  as Amazon was misreporting file size and it was causing Pymazon to
erroneously fail
- Cleaned up code all over the place: logging, settings, etc...


Pymazon is available in the cheeseshop and google code.

Pymazon is a Python implemented downloader for the amazon mp3 store.

You can read more about Pymazon at http://code.google.com/p/pymazon/.

I always appreciate comments and bug reports.

Cheers!

Chris
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From tjreedy at udel.edu  Thu Mar 25 12:43:13 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Thu, 25 Mar 2010 12:43:13 -0400
Subject: from import and __init__.py
In-Reply-To: <20100325101632.GA4727@xs4all.nl>
References: <20100325101632.GA4727@xs4all.nl>
Message-ID: <hog3r2$8mr$1@dough.gmane.org>

On 3/25/2010 6:16 AM, egbert wrote:
> When I do 'from some_package import some_module'
> the __init__.py of some_package will be run.
> However, there will not be anything like a  package-module,
> and the effects of __init__.py seem all to be lost. Is that true ?

No. If you do

from sys import modules
print(modules.keys())

you will see both some_package and some_package.some_module among the 
entries. The first is the result of executing some_package/__init__.py. 
As usual, that code will *not* be re-exectured on subsequent imports 
involving some_package.


 > Or can I still do something useful with __init__.py ?
 > e

Some packages put something like 'from _default_stuff import *' in 
__init__.py with the intention that the package by used as

import package

perhaps [optionally] followed by

import package.specialized_stuff

Terry Jan Reedy





From sridharr at activestate.com  Thu Mar 25 12:59:30 2010
From: sridharr at activestate.com (Sridhar Ratnakumar)
Date: Thu, 25 Mar 2010 09:59:30 -0700
Subject: ANN: ActivePython 2.6.5.12 and 3.1.2.3 are now available
Message-ID: <5BD6EC71-9F23-4DF8-9DCE-9A03E6FFFAEC@activestate.com>

We are pleased to announce the availability of both ActivePython 2.6.5.12 and ActivePython 3.1.2.3. 

    http://www.activestate.com/activepython/

Here is what you should know about these two releases:

PyWin32: PyWin32 is now included in the 64-bit & Python3 builds! Since we recently updated our PyWin32 source tree, this release comes with several bug fixes.

PyPM: There is now an ?upgrade? feature in PyPM, our beloved Python Package Manager distributed with ActivePython free of charge. What this means is that if you type ?pypm upgrade? it will update all your installed Python Packages to the latest version to save you time and keep you up-to-date.

Switch between Python versions: Also new in this 2.6 release is a new tool called "pythonselect" that can be used to switch between multiple ActivePython versions. This is currently only supported on MacOSX although support for other platforms and, perhaps, other Python installations, is in the roadmap (patches are welcome too!).

Dive Into Python 3: ActivePython 3.1.2.3 now includes Mark Pilgrim?s Dive Into Python 3, the popular advanced tutorial for learning Python3. You can find it  in the documentation section.

Miscellaneous: We also updated the base Tcl/Tk version to 8.5.8; added OpenSSL and ctypes support in the 64-bit build; upgraded to openssl-0.9.8l; included Tcl/Tk development headers ? among several other bug fixes with IDLE and Tkinter installation. And of course, they use the latest Python version: 2.6.5 and 3.1.2.

See the release notes for full details:

    http://docs.activestate.com/activepython/2.6/relnotes.html#changes
    http://docs.activestate.com/activepython/2.6/relnotes.html#changes

And our blog post on this release:

    http://blogs.activestate.com/2010/03/activestate-releases-activepython-2-6-5-12-and-activepython-3-1-2-3/


What is ActivePython?
---------------------

ActivePython is ActiveState's binary distribution of Python. Builds for Windows, Mac OS X, Linux are made freely available. Builds for Solaris, HP-UX and AIX, and access to older versions are available with ActivePython Business Edition:

    http://www.activestate.com/business_edition/

ActivePython includes the Python core and the many core extensions: zlib and bzip2 for data compression, the Berkeley DB (bsddb) and SQLite (sqlite3) database libraries, OpenSSL bindings for HTTPS support, the Tix GUI widgets for Tkinter, ElementTree for XML
processing, ctypes (on supported platforms) for low-level library access, and others. The Windows distribution ships with PyWin32 -- a
suite of Windows tools developed by Mark Hammond, including bindings to the Win32 API and Windows COM. 

Beginning with the 2.6.3.7 release, ActivePython includes a binary package manager for Python (PyPM) that can be used to install packages much easily. For example:

    pypm install pylons

See this page for full details:

    http://docs.activestate.com/activepython/2.6/whatsincluded.html

As well, ActivePython ships with a wealth of documentation for both new and experienced Python programmers. In addition to the core Python docs, ActivePython includes the "What's New in Python" series, "Dive into Python", the Python FAQs & HOWTOs, and the Python Enhancement Proposals (PEPs).

An online version of the docs can be found here:

    http://docs.activestate.com/activepython/2.6/

We would welcome any and all feedback to:

    ActivePython-feedback at activestate.com

Please file bugs against ActivePython at:

    http://bugs.activestate.com/query.cgi?set_product=ActivePython


On what platforms does ActivePython run?
----------------------------------------

ActivePython includes installers for the following platforms:

- Windows/x86
- Windows/x64 (aka "AMD64")
- Mac OS X
- Linux/x86
- Linux/x86_64 (aka "AMD64")
- Solaris/SPARC (Business Edition only)
- Solaris/x86 (Business Edition only)
- HP-UX/PA-RISC (Business Edition only)
- AIX/PowerPC (Business Edition only)
- AIX/PowerPC 64-bit (Business Edition only)

Custom builds are available in Enterprise Edition:

    http://www.activestate.com/activepython/enterprise/


Thanks, and enjoy!

The Python Team

--
Sridhar Ratnakumar
sridharr at activestate.com

From andreas.loescher at s2005.tu-chemnitz.de  Thu Mar 25 13:41:23 2010
From: andreas.loescher at s2005.tu-chemnitz.de (Andreas =?ISO-8859-1?Q?L=F6scher?=)
Date: Thu, 25 Mar 2010 18:41:23 +0100
Subject: Castrated traceback in sys.exc_info()
In-Reply-To: <mailman.1070.1269283632.23598.python-list@python.org>
Message-ID: <1269538883.9315.6.camel@laptop>


> As you see, the traceback only starts from function c, which handles the 
> exception.
> It doesn't show main(), a() and b(), which might however be (and are, in 
> my case) critical to diagnose the severity of the problem (since many 
> different paths would lead to calling c()).

This results in the way the tb is created.

If an exception occours, and there is no one who handles it in the
current function, a traceback object is created. Because the the calling
function could have a try-except clause, the function returns with NULL
and an set exception. Now if there is no one to handle the exception, a
traceback object is created and linked with the existing one.

In your case does the traceback start from the function c, because no
exception occoured in main() etc. You catched it. If you want to
determine the calling path, you can take a look at the encapsuled frame
in the tb. 

Best




From anfedorov at gmail.com  Thu Mar 25 13:41:57 2010
From: anfedorov at gmail.com (Andrey Fedorov)
Date: Thu, 25 Mar 2010 13:41:57 -0400
Subject: Repetition of work in Jython
Message-ID: <7659cab31003251041if13b73fmf17e759ea52b1015@mail.gmail.com>

Hi all,

So from what I understand, Jython translates Python code into JVM byte code.
Does anyone know why this was chosen instead of translating Python bytecode
to JVM bytecode directly? It seems that it would be a lot easier to get
Jython up-to-speed if there could be some "shared components" between them
and CPython, no?

- Andrey
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From steve at holdenweb.com  Thu Mar 25 14:10:00 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 25 Mar 2010 14:10:00 -0400
Subject: Repetition of work in Jython
In-Reply-To: <7659cab31003251041if13b73fmf17e759ea52b1015@mail.gmail.com>
References: <7659cab31003251041if13b73fmf17e759ea52b1015@mail.gmail.com>
Message-ID: <4BABA6F8.8070609@holdenweb.com>

Andrey Fedorov wrote:
> Hi all,
> 
> So from what I understand, Jython translates Python code into JVM byte
> code. Does anyone know why this was chosen instead of translating Python
> bytecode to JVM bytecode directly? It seems that it would be a lot
> easier to get Jython up-to-speed if there could be some "shared
> components" between them and CPython, no?
> 
I don't *know* why Jim Hugunin chose not to take that approach, but I
can easily imagine it would be because a mapping of the Python byte code
to the Java byte code would be much less efficient.

There are various approaches that one could take. The least efficient
would be to write a Python virtual machine in Java, thereby putting two
levels of interpretation into the execution paths.

I doubt it would be possible to get maximal JVM efficiency from code
cast into Python byte codes just because of the disparity between the
two VMs.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/


From steve at holdenweb.com  Thu Mar 25 14:10:00 2010
From: steve at holdenweb.com (Steve Holden)
Date: Thu, 25 Mar 2010 14:10:00 -0400
Subject: Repetition of work in Jython
In-Reply-To: <7659cab31003251041if13b73fmf17e759ea52b1015@mail.gmail.com>
References: <7659cab31003251041if13b73fmf17e759ea52b1015@mail.gmail.com>
Message-ID: <4BABA6F8.8070609@holdenweb.com>

Andrey Fedorov wrote:
> Hi all,
> 
> So from what I understand, Jython translates Python code into JVM byte
> code. Does anyone know why this was chosen instead of translating Python
> bytecode to JVM bytecode directly? It seems that it would be a lot
> easier to get Jython up-to-speed if there could be some "shared
> components" between them and CPython, no?
> 
I don't *know* why Jim Hugunin chose not to take that approach, but I
can easily imagine it would be because a mapping of the Python byte code
to the Java byte code would be much less efficient.

There are various approaches that one could take. The least efficient
would be to write a Python virtual machine in Java, thereby putting two
levels of interpretation into the execution paths.

I doubt it would be possible to get maximal JVM efficiency from code
cast into Python byte codes just because of the disparity between the
two VMs.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From sridharr at activestate.com  Thu Mar 25 14:47:27 2010
From: sridharr at activestate.com (Sridhar Ratnakumar)
Date: Thu, 25 Mar 2010 11:47:27 -0700
Subject: Possible? Python 2.6.x and PythonWin on 64-bit Windows 7
In-Reply-To: <AC49051E-3596-41CC-B973-A749AAB57F59@activestate.com>
References: <a46f9377-a06e-4af1-a23e-d53607ca62dc@q16g2000yqq.googlegroups.com>
	<5b6da8b6-f814-4779-b7cb-b02762e16f2c@a5g2000yqi.googlegroups.com>
	<5cb36cc2-fe75-4542-af70-b33400fd4dea@f8g2000yqn.googlegroups.com>
	<AC49051E-3596-41CC-B973-A749AAB57F59@activestate.com>
Message-ID: <B57F7916-1EF2-4B1A-8757-8CC446910E7C@activestate.com>


On 2010-02-09, at 2:49 PM, Sridhar Ratnakumar wrote:

> 
> On 2010-02-07, at 5:02 PM, escalation746 wrote:
> 
>> Andrej Mitrovic wrote:
>> 
>>> Perhaps you've accidentally downloaded the wrong version of PythonWin?
>> 
>> Erk, yes, my bad.
>> 
>> Thanks for the quick help! Though I still wonder why the ActiveState
>> build does not include this.
> 
> I just added support for PyWin32 in ActivePython 2.6 64-bit.
> 
>  http://twitter.com/sridhr/status/8874549314
> 
> I should be part of next release (2.6.4.11).

PyWin32, and thus PythonWin, is now available in all of the recent ActivePython releases: 2.5.5.7, 2.6.5.12 and 3.1.2.3. 

See also http://blogs.activestate.com/2010/03/activestate-releases-activepython-2-6-5-12-and-activepython-3-1-2-3/

-srid

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From irmen-NOSPAM- at xs4all.nl  Thu Mar 25 14:55:45 2010
From: irmen-NOSPAM- at xs4all.nl (Irmen de Jong)
Date: Thu, 25 Mar 2010 19:55:45 +0100
Subject: Is there any library for indexing binary data?
In-Reply-To: <mailman.1177.1269510930.23598.python-list@python.org>
References: <mailman.1168.1269487743.23598.python-list@python.org>	<4bab182a$0$22933$e4fe514c@news.xs4all.nl>
	<mailman.1177.1269510930.23598.python-list@python.org>
Message-ID: <4babb132$0$22945$e4fe514c@news.xs4all.nl>

On 25-3-2010 10:55, ?? wrote:
> Thank you irmen. I will take a look at pytable.
> FYI, let me explain the case clearly.
> 
> Originally, my big data table is simply array of Item:
> struct Item
> {
>      long id;    // used as key
>      BYTE payload[LEN];   // corresponding value with fixed length
> };
> 
> All items are stored in one file by using "stdio.h" function:
>      fwrite(itemarray, sizeof(Item), num_of_items, fp);
> 
> Note that "id" is randomly unique without any order. To speed up
> searching  I regrouped / sorted them into two-level hash tables (in
> the form of files).  I want to employ certain library to help me index
> this table.
> 
> Since the table contains about 10^9 items and LEN is about 2KB, it is
> impossible to hold all data in memory. Furthermore, some new item may
> be inserted into the array. Therefore incremental indexing feature is
> needed.

I see, I thought the payload data was small as well. What about this idea:
Build a hash table where the keys are the id from your Item structs and
the value is the file seek offset of the Item 'record' in your original
datafile. (although that might generate values of type long, which take
more memory than int, so maybe we should use file_offset/sizeof(Item).
This way you can just keep your original data file (you only have to
scan it to build the hash table) and you will avoid a lengthy conversion
process.

If this hashtable still doesn't fit in memory use a sparse array
implementation of some sort that is more efficient at storing simple
integers, or just put it into a database solution mentioned in earlier
responses.

Another thing: I think that your requirement of 1e7 lookups per second
is a bit steep for any solution where the dataset is not in core memory
at once though.

Irmen.


From st.chris at gmail.com  Thu Mar 25 15:51:48 2010
From: st.chris at gmail.com (=?UTF-8?Q?Christian_=C5=9Etef=C4=83nescu?=)
Date: Thu, 25 Mar 2010 20:51:48 +0100
Subject: Improved timedelta attributes/methods
Message-ID: <ded3be3b1003251251o69627c2ct6ed74020bad22c65@mail.gmail.com>

Hello dear Python-wielding developers!

I generally like date/time handling in Python very much, especially how date
operations result in Timedelta
objects<http://docs.python.org/library/datetime.html#timedelta-objects>.
But I find it somewhat impractical, that you can only get days, seconds and
microseconds out of a time delta. I think it would be much more comfortable
to have fields for minutes, hours, maybe also years, months. Is there a
specific reasoning why this is not available?

I would gladly do my best to implement such a solution, if it would make
sense to the devs.

Regards,
Chris
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From peter at psantoro.net  Thu Mar 25 16:07:42 2010
From: peter at psantoro.net (Peter)
Date: 25 Mar 2010 20:07:42 GMT
Subject: RELEASED Python 2.6.5
References: <mailman.990.1269039418.23598.python-list@python.org>
	<hoajos028di@drn.newsguy.com> <hoe3a9$vj3$1@online.de>
Message-ID: <hogfqe03fg@news1.newsguy.com>

On Wed, 24 Mar 2010 23:22:01 +0100, Martin v. Loewis wrote:

>> Is anyone else having trouble with the 2.6.5 Windows x86 installer?
> 
> Not me. Run
> 
> msiexec /i py...msi /l*v py.log
> 
> and inspect py.log for errors (post it to bugs.python.org if you can't
> determine the cause of the problems).


Martin,

Thanks for the tip about the msiexec command line usage.  If I run the 
installer without selecting the Advanced compiling option, it works fine.

The relevent part of the log when it fails using the Advanced compiling 
option is as follows:

--------------------

MSI (s) (4C:B4) [14:41:27:205]: Doing action: CompilePyc
Action 14:41:27: CompilePyc. 
Action start 14:41:27: CompilePyc.
MSI (s) (4C:B4) [14:45:45:528]: Note: 1: 1722 2: CompilePyc 3: C:\bin
\Python26\python.exe 4: -Wi "C:\bin\Python26\Lib\compileall.py" -f -x 
bad_coding|badsyntax|site-packages|py3_ "C:\bin\Python26\Lib" 
MSI (s) (4C:B4) [14:45:45:528]: Note: 1: 2262 2: Error 3: -2147287038 
Error 1722. There is a problem with this Windows Installer package. A 
program run as part of the setup did not finish as expected. Contact your 
support personnel or package vendor.  Action CompilePyc, location: C:\bin
\Python26\python.exe, command: -Wi "C:\bin\Python26\Lib\compileall.py" -f 
-x bad_coding|badsyntax|site-packages|py3_ "C:\bin\Python26\Lib" 
MSI (s) (4C:B4) [14:47:41:133]: Note: 1: 2262 2: Error 3: -2147287038 
MSI (s) (4C:B4) [14:47:41:133]: Product: Python 2.6.5 -- Error 1722. 
There is a problem with this Windows Installer package. A program run as 
part of the setup did not finish as expected. Contact your support 
personnel or package vendor.  Action CompilePyc, location: C:\bin\Python26
\python.exe, command: -Wi "C:\bin\Python26\Lib\compileall.py" -f -x 
bad_coding|badsyntax|site-packages|py3_ "C:\bin\Python26\Lib" 

Action ended 14:47:41: CompilePyc. Return value 3.
Action ended 14:47:41: INSTALL. Return value 3.

--------------------

I believe the cause of the installation failure message is with the 
syntax of the following command:

C:\bin\Python26\python.exe -Wi "C:\bin\Python26\Lib\compileall.py" -f -x 
bad_coding|badsyntax|site-packages|py3_ "C:\bin\Python26\Lib"

If you run this command in the Windows XP shell, it yields an error.  If 
you wrap the -x option's args in double quotes, it runs ok (except for a 
syntax error when compiling one of the python source files - I don't 
remember which one):

C:\bin\Python26\python.exe -Wi "C:\bin\Python26\Lib\compileall.py" -f -x 
"bad_coding|badsyntax|site-packages|py3_" "C:\bin\Python26\Lib"

So it appears that the Windows XP shell is interpreting the "|" 
characters within the -x option's args as pipe characters and trys to 
pipe the "multiple commands" together.  The simple work around is to not 
use the Advanced compiling option.

Peter


From steve at REMOVE-THIS-cybersource.com.au  Thu Mar 25 17:11:50 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 25 Mar 2010 21:11:50 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<pan.2010.03.24.21.07.24@REMOVE.THIS.cybersource.com.au>
	<2010032423502316807-tomfsessile@gmailcom>
	<pan.2010.03.25.07.34.50@REMOVE.THIS.cybersource.com.au>
	<8113nqFsggU3@mid.individual.net>
	<hofmom$vkk$1@news.eternal-september.org>
Message-ID: <4babd196$0$8766$c3e8da3@news.astraweb.com>

On Thu, 25 Mar 2010 14:02:05 +0100, Alf P. Steinbach wrote:

> * Neil Cerutti:
>> On 2010-03-25, Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au>
>> wrote:
>>>> You might not want to be so glib.  The sum doc sure doesn't sound
>>>> like it should work on lists.
>>>>
>>>>     Returns the sum of a sequence of numbers (NOT strings) plus the
>>>>     value of parameter 'start' (which defaults to 0).
>>> What part of that suggested to you that sum might not be polymorphic?
>>> Sure, it says numbers (which should be changed, in my opinion), but it
>>> doesn't specify what sort of numbers -- ints, floats, or custom types
>>> that have an __add__ method.
>> 
>> WTF.
> 
> I think Steven's argument is that it would be pointless for 'sum' to
> distinguish between user-defined numerical types and other types that
> happen to support '+'.

Before Python2.6, which introduced a numeric tower, Python *couldn't* 
reliably distinguish between numeric types and other types that 
overloaded +. Since Python discourages type-checking in favour of duck-
typing and try...except, this is seen as a good thing.

My argument is that sum isn't hard-coded to only work on the built-ins 
ints or floats, but it supports any object that you can use the + 
operator on. The *sole* exceptions are str and unicode (not even 
UserString), and even there it is very simple to overcome the restriction:

>>> sum(['a', 'b'], '')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: sum() can't sum strings [use ''.join(seq) instead]
>>> class S:
...     def __add__(self, other):
...             return other
...
>>> sum(['a', 'b'], S())
'ab'


[...]
> However, given that it isn't restricted to numbers, the restriction wrt.
> strings is a bit perplexing in the context of modern CPython. But for
> Python implementations that don't offer the '+=' optimization it might
> help to avoid gross inefficiencies, namely quadratic time string
> concatenation.

I agree -- the Python philosophy is to allow the user to shoot themselves 
in the foot if they wish to. You're responsible for the Big Oh behaviour 
of your code, not the compiler.


[...]
> However, if that hypothesis about the rationale is correct, then 'sum'
> should also be restricted to not handle tuples or lists, so forth, but
> at least the CPython implementation does.

The reasoning is that naive users are far, far more likely to try summing 
a large list of strings than to try summing a large list of lists, and 
therefore in practical terms the consequences of allowing sum on lists is 
slight enough and rare enough to not be worth the check.

I suspect that this is just an after the fact rationalisation, and that 
the real reason is that those responsible for the hand-holding in sum 
merely forgot, or didn't know, that repeated addition of lists and tuples 
is also O(N**2). But I've never cared enough to dig through the archives 
to find out.



-- 
Steven


From winstonw at stratolab.com  Thu Mar 25 17:16:12 2010
From: winstonw at stratolab.com (Winston)
Date: Thu, 25 Mar 2010 14:16:12 -0700 (PDT)
Subject: Revisiting Generators and Subgenerators
Message-ID: <a00c64fb-1eed-4bc8-943d-50e9d1c762ff@n39g2000prj.googlegroups.com>

I have been reading PEP 380 because I am writing a video game/
simulation in Jython and I need cooperative multitasking. PEP 380 hits
on my problem, but does not quite solve it for me. I have the
following proposal as an alternative to PEP380. I don't know if this
is the right way for me to introduce my idea, but below is my writeup.
Any thoughts?

------------------------
Proposal for a new Generator Syntax in Python 3K--
A Baton object for generators to allow subfunction to yield, and to
make
them symetric.

Abstract
--------
    Generators can be used to make coroutines. But they require the
programmer
    to take special care in how he writes his generator. In
particular,
    only the generator function may yield a value. We propose a
modification
    to generators in Python 3 where a "Baton" object is given to both
    sides of a generator. Both sides use the baton object to pass
execution
    to the other side, and also to pass values to the other side.

    The advantages of a baton object over the current scheme are: (1)
    the generator function can pass the baton to a subfunction,
solving the
    needs of PEP 380, (2) after creation both sides of the generator
function
    are symetric--they both can call yield(), send(), next(). They do
the
    same thing. This means programming with generators is the same as
    programming with normal functions. No special contortions are
needed
    to pass values back up to a yield command at the top.

Motivation
----------
    Generators make certain programming tasks easier, such as (a) an
iterator
    which is of infinite length, (b) using a "trampoline function"
they can
    emulate coroutines and cooperative multitasking, (c) they can be
used
    to make both sides of a producer-consumer pattern easy to write--
both
    sides can appear to be the caller.

    On the down side, generators as they currently are implemented in
Python 3.1
    require the programmer to take special care in how he writes his
    generator. In particular, only the generator function may yield a
    value--subfunctions called by the generator function may not yield
a value.

    Here are  two use-cases in which generators are commonly used, but
where the
    current limitation causes less readable code:

    1) a long generator function which the programmer wants to split
into several
        functions. The subfunctions should be able to yield a result.
Currently
        the subfunctions have to pass values up to the main generator
and have
        it yield the results back. Similarly subfunctions cannot
receive values
        that the caller sends with generator.send()

    2) generators are great for cooperative multitasking. A common use-
case is
        agent simulators where many small "tasklets" need to run and
then pass
        execution over to other tasklets. Video games are a common
scenario,
        as is SimPy. Without cooperative multitasking, each tasklet
must be
        contorted to run in a small piece and then return. Generators
help this,
        but a more complicated algorithm which is best decomposed into
several
        functions must be contorted because the subfuctions cannot
yield or
        recive data from the generator.send().

    Here is also a nice description of how coroutines make programs
    easier to read and write:
        http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html

Proposal
--------
    If there is a way to make a sub-function of a generator yield and
receive
    data from generator.send(), then the two problems above are
solved.

    For example, this declares a generator. The first parameter of the
generator
    is the "context" which represents the other side of the execution
frame.

    a Baton object represents a passing of the execution from one line
    of code to another. A program creates a Baton like so:

        generator f( baton ):
            # compute something
            baton.yield( result )
            # compute something
            baton.yield( result )

        baton = f()
        while True:
            print( baton.yield() )


    A generator function, denoted with they keyword "generator"
instead of "def"
    will return a "baton". Generators have the following methods:
        __call__( args... ) --
            This creates a Baton object which is passed back to the
caller,
            i.e. the code that executed the Baton() command. Once the
baton
            starts working, the two sides are symetric. So we will
call the
            first frame, frame A and the code inside 'function' frame
B.
            Frame is is returned a baton object. As soon as frame A
            calls baton.yield(), frame B begins, i.e. 'function'
starts
            to run. function is passed the baton as its first
argument,
            and any additional arguments are also passed in. When
frame B
            yields, any value that it yields will be returned to frame
A
            as the result of it's yield().
    Batons have the following methods:
        yield( arg=None ) -- This method will save the current
execution state,
            restore the other execution state, and start running the
            other function from where it last left off, or from the
beginning
            if this is the first time.
            If the optional 'arg' is given, then the other side will
be "returned"
            this value from it's last yield(). Note that like
generators, the first
            call to yield may not pass an argument.
        next() -- This method is the same as yield(None). next()
            allows the baton to be an iterator.
        __iter__() -- A baton is an iterator so this just returns the
baton
            back. But it is needed to allow use of batons in "for"
statements.
        start() -- This starts the frame B function running. It may
only be called on
            a new baton. It starts the baton running in frame B, and
            returns the Baton object to the caller in frame A. Any
value
            from the first yield is lost.

                baton = Baton( f ).start()
            It is equivalent to:
                baton = Baton( f )  # Create the baton
                baton.yield()       # Begin executing in frame B



Examples
--------

    Simple Generator:
        generator doubler( baton, sequence ):
            for a in sequence:
                print( a )
                baton.yield( a+a )

        baton = doubler( [3,8,2] )
        for j in baton: # For statement calls baton.__iter__, and then
baton.next()
            print j

    Complicated Generator broken into parts:

        generator Complicated( baton, sequence ):
            '''A generator function, but there are no yield statements
                in this function--they are in subfunctions.'''
            a = sequence.next()
            if is_special(a):
                parse_special( baton, a, sequence)
            else:
                parse_regular( baton, a, sequence )

        def parse_special( baton, first, rest ):
            # process first
            baton.yield()
            b = rest.next()
            parse_special( baton, b, rest )

        def parse_regular( baton, first, rest ):
            # more stuff
            baton.yield()

        baton = Complicated( iter('some data here') )
        baton.yield()


    Cooperative Multitasker:

        class Creature( object ):
            def __init__(self, world):
                self.world = world

            generator start( self, baton ):
                '''Designated entry point for tasklets'''
                # Baton saved for later. Used in other methods like
escape()
                self.baton = baton
                self.run()

            def run(self):
                pass # override me in your subclass

            def escape(self):
                # set direction and velocity away from baton creatures
                self.baton.yield()

            def chase(self):
                while True:
                    # set direction and velocity TOWARDS nearest
creature
                    self.baton.yield()
                    # if near enough, try to pounce
                    self.baton.yield()


        class Vegetarian( Tasklet ):
            def run(self):
                if self.world.is_creature_visible():
                    self.escape()
                else:
                    # do nothing
                    self.baton.yield()

        class Carnivore( Tasklet ):
            def run(self):
                if self.world.is_creature_visible():
                    self.chase()
                else:
                    # do nothing
                    self.baton.yield()

        w = SimulationWorld()
        v = Vegetarian( w ).start()
        c = Carnivore( w ).start()
        while True:
            v.yield()
            c.yield()


Benefits
--------

    This new syntax for a generator provides all the benefits of the
old
    generator, including use like a coroutine. Additionally, it makes
    both sides of the generator almost symetric, i.e. they both
"yield"
    or "send" to the other. And since the baton objects are passed
    around, subfunctions can yield back to the other execution frame.
    This fixes problems such as PEP 380.

    My ideas for syntax above are not fixed, the important concept
here is
    that the two sides of the generator functions will have a "baton"
to
    represent the other side. The baton can be passed to sub-
functions, and
    values can be sent, via the baton, to the other side.

    This new syntax for a generator will break all existing programs.
But
    we happen to be at the start of Python 3K where new paradaigms are
    being examined.

Alternative Syntax
------------------

    With old style generators, g.next() and g.send( 1 ) are
conceptually
    the same as "yield" and "yield 1" inside the generator. They both
pass
    execution to the other side, and the second form passes a value.
Yet they
    currently have different syntax. Once we have a baton object, we
can get rid of
    one of these forms. g.next() is needed to support iterators. How
about we keep
    baton.next() and baton.send( 1 ). We get rid of yield completely.

    Perhaps instead of a "generator" keyword to denote the generator
    function, a "fork" keyword should be used to begin the second
    execution frame. For example:

        def f( baton ):
            # compute something
            baton.send( result )
            # compute something
            baton.send( result )

        baton = fork f()
        while True:
            print( baton.next() )

    or maybe the "yield" keyword can be used here:

        def f( baton ):
            # compute something
            baton.send( result )
            # compute something
            baton.send( result )

        baton = yield f
        while True:
            print( baton.next() )


From winstonw at stratolab.com  Thu Mar 25 17:39:51 2010
From: winstonw at stratolab.com (Winston)
Date: Thu, 25 Mar 2010 14:39:51 -0700 (PDT)
Subject: Revisiting Generators and Subgenerators
Message-ID: <bc11ef60-2d6e-46d7-94b4-ed2096834b33@f12g2000prn.googlegroups.com>

Here's my proposal again, but hopefully with better formatting so you
can read it easier.


-Winston
-----------------

Proposal for a new Generator Syntax in Python 3K--
A Baton object for generators to allow subfunction to yield, and to
make
them symetric.

Abstract
--------
    Generators can be used to make coroutines. But they require
    the programmer to take special care in how he writes his
    generator. In particular, only the generator function may
    yield a value. We propose a modification to generators in
    Python 3 where a "Baton" object is given to both sides of a
    generator. Both sides use the baton object to pass execution
    to the other side, and also to pass values to the other side.

    The advantages of a baton object over the current scheme are:
    (1) the generator function can pass the baton to a
    subfunction, solving the needs of PEP 380, (2) after creation
    both sides of the generator function are symetric--they both
    can call yield(), send(), next(). They do the same thing.
    This means programming with generators is the same as
    programming with normal functions. No special contortions are
    needed to pass values back up to a yield command at the top.

Motivation
----------
    Generators make certain programming tasks easier, such as (a)
    an iterator which is of infinite length, (b) using a
    "trampoline function" they can emulate coroutines and
    cooperative multitasking, (c) they can be used to make both
    sides of a producer-consumer pattern easy to write--both
    sides can appear to be the caller.

    On the down side, generators as they currently are
    implemented in Python 3.1 require the programmer to take
    special care in how he writes his generator. In particular,
    only the generator function may yield a value--subfunctions
    called by the generator function may not yield a value.

    Here are  two use-cases in which generators are commonly
    used, but where the current limitation causes less readable
    code:

    1) a long generator function which the programmer wants to
    split into several functions. The subfunctions should be able
    to yield a result. Currently the subfunctions have to pass
    values up to the main generator and have it yield the results
    back. Similarly subfunctions cannot receive values that the
    caller sends with generator.send()

    2) generators are great for cooperative multitasking. A
    common use-case is agent simulators where many small
    "tasklets" need to run and then pass execution over to other
    tasklets. Video games are a common scenario, as is SimPy.
    Without cooperative multitasking, each tasklet must be
    contorted to run in a small piece and then return. Generators
    help this, but a more complicated algorithm which is best
    decomposed into several functions must be contorted because
    the subfuctions cannot yield or recive data from the
    generator.send().

    Here is also a nice description of how coroutines make
    programs easier to read and write:
        http://www.chiark.greenend.org.uk/~sgtatham/coroutines.html

Proposal
--------
    If there is a way to make a sub-function of a generator yield
    and receive data from generator.send(), then the two problems
    above are solved.

    For example, this declares a generator. The first parameter
    of the generator is the "context" which represents the other
    side of the execution frame.

    a Baton object represents a passing of the execution from one
    line of code to another. A program creates a Baton like so:

        generator f( baton ):
            # compute something
            baton.yield( result )
            # compute something
            baton.yield( result )

        baton = f()
        while True:
            print( baton.yield() )


    A generator function, denoted with they keyword "generator"
    instead of "def" will return a "baton". Generators have the
    following methods:
        __call__( args... ) --
            This creates a Baton object which is passed back to
            the caller, i.e. the code that executed the Baton()
            command. Once the baton starts working, the two sides
            are symetric. So we will call the first frame, frame
            A and the code inside 'function' frame B. Frame is is
            returned a baton object. As soon as frame A calls
            baton.yield(), frame B begins, i.e. 'function' starts
            to run. function is passed the baton as its first
            argument, and any additional arguments are also
            passed in. When frame B yields, any value that it
            yields will be returned to frame A as the result of
            it's yield().

    Batons have the following methods:
        yield( arg=None ) -- This method will save the current
            execution state, restore the other execution state,
            and start running the other function from where it
            last left off, or from the beginning if this is the
            first time. If the optional 'arg' is given, then the
            other side will be "returned" this value from it's
            last yield(). Note that like generators, the first
            call to yield may not pass an argument.
        next() -- This method is the same as yield(None). next()
            allows the baton to be an iterator.
        __iter__() -- A baton is an iterator so this just returns
            the baton back. But it is needed to allow use of
            batons in "for" statements.
        start() -- This starts the frame B function running. It
            may only be called on a new baton. It starts the
            baton running in frame B, and returns the Baton
            object to the caller in frame A. Any value from the
            first yield is lost.

                baton = Baton( f ).start()
            It is equivalent to:
                baton = Baton( f )  # Create the baton
                baton.yield()       # Begin executing in frame B



Examples
--------

    Simple Generator:
        generator doubler( baton, sequence ):
            for a in sequence:
                print( a )
                baton.yield( a+a )

        baton = doubler( [3,8,2] )
        # For statement calls baton.__iter__, and then baton.next()
        for j in baton:
            print j

    Complicated Generator broken into parts:

        generator Complicated( baton, sequence ):
            '''A generator function, but there are no yield
            statements in this function--they are in
            subfunctions.'''
            a = sequence.next()
            if is_special(a):
                parse_special( baton, a, sequence)
            else:
                parse_regular( baton, a, sequence )

        def parse_special( baton, first, rest ):
            # process first
            baton.yield()
            b = rest.next()
            parse_special( baton, b, rest )

        def parse_regular( baton, first, rest ):
            # more stuff
            baton.yield()

        baton = Complicated( iter('some data here') )
        baton.yield()


    Cooperative Multitasker:

        class Creature( object ):
            def __init__(self, world):
                self.world = world

            generator start( self, baton ):
                '''Designated entry point for tasklets'''
                # Baton saved for later. Used in other
                # methods like escape()
                self.baton = baton
                self.run()

            def run(self):
                pass # override me in your subclass

            def escape(self):
                # set direction and velocity away
                # from baton creatures
                self.baton.yield()

            def chase(self):
                while True:
                    # set direction and velocity TOWARDS
                    # nearest creature
                    self.baton.yield()
                    # if near enough, try to pounce
                    self.baton.yield()


        class Vegetarian( Tasklet ):
            def run(self):
                if self.world.is_creature_visible():
                    self.escape()
                else:
                    # do nothing
                    self.baton.yield()

        class Carnivore( Tasklet ):
            def run(self):
                if self.world.is_creature_visible():
                    self.chase()
                else:
                    # do nothing
                    self.baton.yield()

        w = SimulationWorld()
        v = Vegetarian( w ).start()
        c = Carnivore( w ).start()
        while True:
            v.yield()
            c.yield()


Benefits
--------

    This new syntax for a generator provides all the benefits of
    the old generator, including use like a coroutine.
    Additionally, it makes both sides of the generator almost
    symetric, i.e. they both "yield" or "send" to the other. And
    since the baton objects are passed around, subfunctions can
    yield back to the other execution frame. This fixes problems
    such as PEP 380.

    My ideas for syntax above are not fixed, the important
    concept here is that the two sides of the generator functions
    will have a "baton" to represent the other side. The baton
    can be passed to sub-functions, and values can be sent, via
    the baton, to the other side.

    This new syntax for a generator will break all existing
    programs. But we happen to be at the start of Python 3K where
    new paradaigms are
    being examined.

Alternative Syntax
------------------

    yield, next, and send are redundant
    ------------------------------------
    With old style generators, g.next() and g.send( 1 ) are
    conceptually the same as "yield" and "yield 1" inside the
    generator. They both pass execution to the other side, and
    the second form passes a value. Yet they currently have
    different syntax. Once we have a baton object, we can get rid
    of one of these forms. g.next() is needed to support
    iterators. How about we keep baton.next() and baton.send( 1
    ). We get rid of yield completely.

    Use keyword to invoke a generator rather than declare
    ------------------------------------------------------------
    Perhaps instead of a "generator" keyword to denote the
    generator function, a "fork" keyword should be used to begin
    the second execution frame. For example:

        def f( baton ):
            # compute something
            baton.send( result )
            # compute something
            baton.send( result )

        baton = fork f()
        while True:
            print( baton.next() )

    or maybe the "yield" keyword can be used here:

        def f( baton ):
            # compute something
            baton.send( result )
            # compute something
            baton.send( result )

        baton = yield f
        while True:
            print( baton.next() )


From michel.metzger at gmail.com  Thu Mar 25 18:00:35 2010
From: michel.metzger at gmail.com (Michel)
Date: Thu, 25 Mar 2010 15:00:35 -0700 (PDT)
Subject: Create a class at run-time
Message-ID: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>

Hi everyone,

I'm trying to dynamically create a class. What I need is to define a
class, add methods to it and later instantiate this class. Methods
need to be bound to the instance though, and that's my problem. Here
is what I have so far:

method_template = "def test_foo(self):\
    #actual test_foo\
    pass"
exec method_template

TestClass = types.ClassType("MyTestClass", (unittest.TestCase, ), {})
TestClass.__module__ = "test"

now what to do next?
I looked at types.MethodType but it needs an instance to bind the
method and a function object.
Should I define __new__ to bind the method during instantiation?

Hope this makes sense,

Michel.


From john at castleamber.com  Thu Mar 25 18:13:49 2010
From: john at castleamber.com (John Bokma)
Date: Thu, 25 Mar 2010 16:13:49 -0600
Subject: XPCOM/hulahop: waiting for JavaScript finished?
Message-ID: <87sk7ohwwy.fsf@castleamber.com>


I am playing a bit with hulahop/xpcom using the code found at

http://www.advogato.org/article/1014.html

but have no idea how to check if some JavaScript has finised running.
The _loaded method of Browser is called after the document has finished
loading, but as far as I can tell this doesn't mean that the JavaScript
has finised setting things up.

Is there a way to either wait a few seconds in _loaded (fragile, of
course). time.sleep() (as expected) blocks.

Or better, is there a way to check if JavaScript has stopped running?
(Hmmm... thinking of it, this can also run on events, so maybe there is
no good way to do this?)

Thanks,

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From motoom at xs4all.nl  Thu Mar 25 18:18:17 2010
From: motoom at xs4all.nl (Michiel Overtoom)
Date: Thu, 25 Mar 2010 23:18:17 +0100
Subject: Create a class at run-time
In-Reply-To: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>
References: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>
Message-ID: <4BABE129.8010205@xs4all.nl>

On 2010-03-25 23:00, Michel wrote:

> I'm trying to dynamically create a class. What I need is to define a
> class, add methods to it and later instantiate this class. Methods
> need to be bound to the instance though, and that's my problem.

Maybe this snippet is of any help?

import functools

class Template(object):
     pass

def printmyname(self):
     print self.name

t=Template()
t.name="Pete"
t.printmyname=functools.partial(printmyname,t)

u=Template()
u.name="Mary"
u.printmyname=functools.partial(printmyname,u)

t.printmyname()
u.printmyname()

Greetings,


-- 
"The ability of the OSS process to collect and harness
the collective IQ of thousands of individuals across
the Internet is simply amazing." - Vinod Valloppillil
http://www.catb.org/~esr/halloween/halloween4.html


From egbertum at xs4all.nl  Thu Mar 25 18:28:48 2010
From: egbertum at xs4all.nl (egbert)
Date: Thu, 25 Mar 2010 23:28:48 +0100
Subject: from import and __init__.py
In-Reply-To: <hog3r2$8mr$1@dough.gmane.org>
References: <20100325101632.GA4727@xs4all.nl>
 <hog3r2$8mr$1@dough.gmane.org>
Message-ID: <20100325222848.GB13846@xs4all.nl>

On Thu, Mar 25, 2010 at 12:43:13PM -0400, Terry Reedy wrote:
> On 3/25/2010 6:16 AM, egbert wrote:
> >When I do 'from some_package import some_module'
> >the __init__.py of some_package will be run.
> >However, there will not be anything like a  package-module,
> >and the effects of __init__.py seem all to be lost. Is that true ?
> 
> No. If you do
> 
> from sys import modules
> print(modules.keys())
> 
> you will see both some_package and some_package.some_module among
> the entries. 
Yes, you are right. And I can reach everything with
modules['some_package']
or variants thereof.
Thanks,
egbert

-- 
Egbert Bouwman - Keizersgracht 197 II - 1016 DS  Amsterdam - 020 6257991
========================================================================


From pmaupin at gmail.com  Thu Mar 25 18:34:32 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Thu, 25 Mar 2010 15:34:32 -0700 (PDT)
Subject: Create a class at run-time
References: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>
Message-ID: <239b30ba-5465-4466-b2a6-6a5cf62e1028@35g2000yqm.googlegroups.com>

On Mar 25, 5:00?pm, Michel <michel.metz... at gmail.com> wrote:
> Hi everyone,
>
> I'm trying to dynamically create a class. What I need is to define a
> class, add methods to it and later instantiate this class. Methods
> need to be bound to the instance though, and that's my problem. Here
> is what I have so far:

Well, you should just fill your empty dict with function definitions,
BEFORE you build the class.  That's easiest.  Also, you can just use
type:

def foo(*whatever):
    print foo

bar = type('MyDynamicClass', (object,), dict(foo=foo))

HTH,
Pat


From james.harris.1 at googlemail.com  Thu Mar 25 18:40:33 2010
From: james.harris.1 at googlemail.com (James Harris)
Date: Thu, 25 Mar 2010 15:40:33 -0700 (PDT)
Subject: Python database of plain text editable by notepad or vi
Message-ID: <93d7991f-d688-4692-b34f-2fa571cebbdf@q15g2000yqj.googlegroups.com>

I am looking to store named pieces of text in a form that can be
edited by a standard editor such as notepad (under Windows) or vi
(under Unix) and then pulled into Python as needed. The usual record
locking and transactions of databases are not required.

Another way to look at it is to treat the separate files as entries in
a dictionary. The file name would be the key and the lines of the file
the value.

Anyone know of a database (with a Python interface) which will allow
text files to be treated as database fields? If not I can just write
it but I thought it best to ask if there was an existing solution
first.

James


From jkn_gg at nicorp.f9.co.uk  Thu Mar 25 18:55:20 2010
From: jkn_gg at nicorp.f9.co.uk (jkn)
Date: Thu, 25 Mar 2010 15:55:20 -0700 (PDT)
Subject: Python database of plain text editable by notepad or vi
References: <93d7991f-d688-4692-b34f-2fa571cebbdf@q15g2000yqj.googlegroups.com>
Message-ID: <c9ae2b99-8c92-4c82-81dc-db0b75a2b026@i25g2000yqm.googlegroups.com>

Kirbybase is one possibility.

    http://pypi.python.org/pypi/KirbyBase/1.9


    J^n



From joncle at googlemail.com  Thu Mar 25 18:56:22 2010
From: joncle at googlemail.com (Jon Clements)
Date: Thu, 25 Mar 2010 15:56:22 -0700 (PDT)
Subject: Python database of plain text editable by notepad or vi
References: <93d7991f-d688-4692-b34f-2fa571cebbdf@q15g2000yqj.googlegroups.com>
Message-ID: <46822448-2984-4ef6-85c7-bef834e2e86c@r1g2000yqj.googlegroups.com>

On 25 Mar, 22:40, James Harris <james.harri... at googlemail.com> wrote:
> I am looking to store named pieces of text in a form that can be
> edited by a standard editor such as notepad (under Windows) or vi
> (under Unix) and then pulled into Python as needed. The usual record
> locking and transactions of databases are not required.
>
> Another way to look at it is to treat the separate files as entries in
> a dictionary. The file name would be the key and the lines of the file
> the value.
>
> Anyone know of a database (with a Python interface) which will allow
> text files to be treated as database fields? If not I can just write
> it but I thought it best to ask if there was an existing solution
> first.
>
> James

I could be missing something here, but aren't you basically just
talking about an OS's filesystem?

glob or listdir somewhere, then create a dict using the file contents
would meet your criteria, with very little lines of code -- but I
would be interested to know what the use-case was for this... Is it
read completely at start up time, or if each file contains a large
amount of lines and aren't fixed width (or has no other indexing
support without maintenance), then is a complete sequential-scan
required each time, or do you just tell the user to not update when
running (unless I s'pose something along the lines of a SIGHUP for
config files is applicable).

Sorry, just don't understand why you'd want this.

Jon.


From sccolbert at gmail.com  Thu Mar 25 19:07:56 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Thu, 25 Mar 2010 19:07:56 -0400
Subject: nested threading
In-Reply-To: <4566e767-768f-4399-8a6b-5530ec90b03c@a37g2000prd.googlegroups.com>
References: <4566e767-768f-4399-8a6b-5530ec90b03c@a37g2000prd.googlegroups.com>
Message-ID: <7f014ea61003251607q7a3086adx90eb04a1a2861bce@mail.gmail.com>

Spawning a thread from within a thread works just fine. Calling
thread.start() is a non-blocking function and returns immediately.

On Thu, Mar 25, 2010 at 11:23 AM, Omer Ihsan <omrihsan at gmail.com> wrote:

> is there anything as "nested threading"....that is, call a thread from
> within a thread.
> in this case how will thread locking take place.
>
> for example initially there were two functions that were called using
> threading.Thread. these wont get unlocked unless both of them are done
> with whatever they need to do. if say function 2 calls another thread.
> then what??
>
> inquisitive....:-|
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From ldo at geek-central.gen.new_zealand  Thu Mar 25 19:16:39 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Fri, 26 Mar 2010 12:16:39 +1300
Subject: Sniffing encoding type by looking at file BOM header
References: <mailman.1139.1269442366.23598.python-list@python.org>
Message-ID: <hogqso$fto$1@lust.ihug.co.nz>

In message <mailman.1139.1269442366.23598.python-list at python.org>, 
python at bdurham.com wrote:

> BOM_UTF8     = '\xef\xbb\xbf'

Since when does UTF-8 need a BOM?


From irmen-NOSPAM- at xs4all.nl  Thu Mar 25 19:21:34 2010
From: irmen-NOSPAM- at xs4all.nl (Irmen de Jong)
Date: Fri, 26 Mar 2010 00:21:34 +0100
Subject: Sniffing encoding type by looking at file BOM header
In-Reply-To: <hogqso$fto$1@lust.ihug.co.nz>
References: <mailman.1139.1269442366.23598.python-list@python.org>
	<hogqso$fto$1@lust.ihug.co.nz>
Message-ID: <4babef80$0$22918$e4fe514c@news.xs4all.nl>

On 26-3-2010 0:16, Lawrence D'Oliveiro wrote:
> In message<mailman.1139.1269442366.23598.python-list at python.org>,
> python at bdurham.com wrote:
>
>> BOM_UTF8     = '\xef\xbb\xbf'
>
> Since when does UTF-8 need a BOM?

It doesn't, but it is allowed. Not recommended though.
Unfortunately several tools, such as notepad.exe, have a tendency of 
silently adding it when saving files.

-irmen



From martin.hellwig at dcuktec.org  Thu Mar 25 19:29:09 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Thu, 25 Mar 2010 23:29:09 +0000
Subject: Don't understand behavior; instance form a class in another class'
	instance
Message-ID: <hogrk1$17k$1@news.eternal-september.org>

Hi all,

When I run the following snippet (drastically simplified, to just show 
what I mean):
 >>
import platform, sys

class One(object):
     def __init__(self):
         self.one = True

     def change(self):
         self.one = False

class Two(object):
     def __init__(self):
         self._instance_one = One()
         self.one = self._instance_one.one
         self.change = self._instance_one.change

if __name__ == '__main__':
     print(sys.version)
     print(platform.machine())
     print(80*'#')
     TEST1 = One()
     print(TEST1.one)
     TEST1.change()
     print(TEST1.one)
     TEST1 = None
     print(80*'#')
     TEST2 = Two()
     print(TEST2.one)
     TEST2.change()
     print(TEST2.one
 >>

I get the following result:

<<
[GCC 4.2.1 20070719  [FreeBSD]]
amd64
################################################################################
True
False
################################################################################
True
True
################################################################################
<<

What I don't understand why in the second test, the last boolean is True 
instead of (what I expect) False.
Could somebody enlighten me please as this has bitten me before and I am 
confused by this behavior.

Thanks in advance

-- 
mph


From lists at cheimes.de  Thu Mar 25 19:41:57 2010
From: lists at cheimes.de (Christian Heimes)
Date: Fri, 26 Mar 2010 00:41:57 +0100
Subject: Don't understand behavior; instance form a class in another class'
	instance
In-Reply-To: <hogrk1$17k$1@news.eternal-september.org>
References: <hogrk1$17k$1@news.eternal-september.org>
Message-ID: <hogsc6$79k$1@dough.gmane.org>

Martin P. Hellwig schrieb:
> What I don't understand why in the second test, the last boolean is True 
> instead of (what I expect) False.
> Could somebody enlighten me please as this has bitten me before and I am 
> confused by this behavior.

Hint: TEST2.one is not a reference to TEST2.__instance_one.one. When you
alter TEST2.__instance_one.one you don't magically change TEST2.one,
too. Python doesn't have variables like C pointers. Python's copy by
object (or share by object) behavior can be understand as labels. The
label TEST2.one references the same object as TEST2.__instance_one.one
until you change where the label TEST2.__instance_one.one points to.

Christian



From martin.hellwig at dcuktec.org  Thu Mar 25 20:06:06 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Fri, 26 Mar 2010 00:06:06 +0000
Subject: Don't understand behavior; instance form a class in another class'
	instance
In-Reply-To: <mailman.1199.1269560532.23598.python-list@python.org>
References: <hogrk1$17k$1@news.eternal-september.org>
	<mailman.1199.1269560532.23598.python-list@python.org>
Message-ID: <hogtpa$2u8$1@news.eternal-september.org>

On 03/25/10 23:41, Christian Heimes wrote:
> Martin P. Hellwig schrieb:
>> What I don't understand why in the second test, the last boolean is True
>> instead of (what I expect) False.
>> Could somebody enlighten me please as this has bitten me before and I am
>> confused by this behavior.
>
> Hint: TEST2.one is not a reference to TEST2.__instance_one.one. When you
> alter TEST2.__instance_one.one you don't magically change TEST2.one,
> too. Python doesn't have variables like C pointers. Python's copy by
> object (or share by object) behavior can be understand as labels. The
> label TEST2.one references the same object as TEST2.__instance_one.one
> until you change where the label TEST2.__instance_one.one points to.
>
> Christian
>

Ah okay thanks for the explanation, Am I correct in thinking (please 
correct me if I mangle up the terminology and/or totally are in the 
wrong ballpark) that this is more or less because the label of the first 
class is to an object (boolean with value False)
and the label of the second class does not cascade to the first label 
for looking something up but instead during assignment sees that it is a 
label to an object instead of the object itself thus copies the label 
content instead?

I probably expected classes namespaces to behave in about the same way 
as lists and dictionaries do, don't know where I picked that up.

Thanks again,

-- 
mph


From ovidiudeac at gmail.com  Thu Mar 25 20:11:39 2010
From: ovidiudeac at gmail.com (Ovidiu Deac)
Date: Fri, 26 Mar 2010 02:11:39 +0200
Subject: python logging writes an empty file
Message-ID: <804cd4021003251711p5c1ec832pf2b98da8f19bef1e@mail.gmail.com>

Hi,

I have the following situation:

My application uses nosetests to discover&run the unittests. I pass
the log configuration file as --logging-config=logging.conf
Everything works just fine, the logs are printed as required by the
configuration file which makes me happy. I take this as a sign that my
logging.conf is correct

Then in my main script, which starts the production application, I
have this line:
logging.config.fileConfig("logging.conf")

The logging module is configured without errors BUT my output.log is
EMPTY. It's like all the messages are filtered.

If I configure logging like this:
    logging.basicConfig(level=logging.INFO,
              format='%(asctime)s %(name)-12s %(levelname)s: %(message)s',
              datefmt='%m-%d %H:%M:%S',
              filename=file,
              filemode='w')
Then the logs are printed ok.

Then I tried this:
    file = logging.FileHandler(logFileBasename, 'w')
    file.setLevel(logging.INFO)
    # set a format which is simpler for console use
    formatter = logging.Formatter('%(asctime)s %(name)-12s
%(levelname)-8s %(message)s',)
    # tell the handler to use this format
    file.setFormatter(formatter)
    # add the handler to the root logger
    logging.getLogger('').addHandler(file)
    logging.getLogger('')

...which also leaves my output file EMPTY.

I'm out of ideas. Can anybody help me with this?

Thanks in advance!
ovidiu

Here is my logging.conf:

[formatters]
keys: detailed,simple

[handlers]
keys: console,file

[loggers]
keys: root

[formatter_simple]
format: %(name)s:%(levelname)s:  %(message)s

[formatter_detailed]
format: %(name)s:%(levelname)s %(module)s:%(lineno)d:  %(message)s

[handler_console]
class: StreamHandler
args: []
formatter: detailed

[handler_file]
class=FileHandler
level=DEBUG
formatter=detailed
args=('output.log', 'w')
filename=output.log
mode=w

[logger_root]
level: INFO
handlers: file
propagate: 1


From cs at zip.com.au  Thu Mar 25 20:23:39 2010
From: cs at zip.com.au (Cameron Simpson)
Date: Fri, 26 Mar 2010 11:23:39 +1100
Subject: Revisiting Generators and Subgenerators
In-Reply-To: <bc11ef60-2d6e-46d7-94b4-ed2096834b33@f12g2000prn.googlegroups.com>
References: <bc11ef60-2d6e-46d7-94b4-ed2096834b33@f12g2000prn.googlegroups.com>
Message-ID: <20100326002339.GA18453@cskk.homeip.net>

On 25Mar2010 14:39, Winston <winstonw at stratolab.com> wrote:
| Here's my proposal again, but hopefully with better formatting so you
| can read it easier.

Having quickly read the Abstract and Motivation, why is this any better
than a pair of threads and a pair of Queue objects? (Aside from
co-routines being more lightweight in terms of machine resources?)

On the flipside, given that generators were recently augumented to
support coroutines I can see your motivation within that framework.

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

C makes it easy for you to shoot yourself in the foot.  C++ makes that
harder, but when you do, it blows away your whole leg.
- Bjarne Stroustrup


From andrej.mitrovich at gmail.com  Thu Mar 25 20:25:58 2010
From: andrej.mitrovich at gmail.com (Andrej Mitrovic)
Date: Thu, 25 Mar 2010 17:25:58 -0700 (PDT)
Subject: Traversing through Dir()
Message-ID: <d2459161-1a78-4380-8687-1497c9349a9d@g11g2000yqe.googlegroups.com>

I would like to traverse through the entire structure of dir(), and
write it to a file.

Now, if I try to write the contents of dir() to a file (via pickle), I
only get the top layer. So even if there are lists within the returned
list from dir(), they get written as a list of strings to the file.

Basically, I have an embedded and somewhat stripped version of Python.
I would like to find out just how much functionality it has (I have no
documentation for it), so I thought the best way to do that is
traverse thru the dir() call. Any clues as to how I could write the
whole structure to a file? I guess I'll need some kind of recursion
here. :)



From winstonw at stratolab.com  Thu Mar 25 20:31:24 2010
From: winstonw at stratolab.com (Winston Wolff)
Date: Thu, 25 Mar 2010 17:31:24 -0700
Subject: Revisiting Generators and Subgenerators
In-Reply-To: <20100326002339.GA18453@cskk.homeip.net>
References: <bc11ef60-2d6e-46d7-94b4-ed2096834b33@f12g2000prn.googlegroups.com>
	<20100326002339.GA18453@cskk.homeip.net>
Message-ID: <21283BA1-DFA5-4DD9-9478-89D0622F447C@stratolab.com>

Coroutines achieve very similar things to threads, but avoid problems resulting from the pre-emptive nature of threads. Specifically, a coroutine indicates where it will yield to the other coroutine. This avoids lots of problems related to synchronization. Also the lightweight aspect is apparently important for some simulations when they have many thousands of agents to simulate--this number of threads becomes a problem.

-Winston

Winston Wolff
Stratolab - Games for Learning
tel: (646) 827-2242
web: www.stratolab.com

On Mar 25, 2010, at 5:23 PM, Cameron Simpson wrote:

> 
> Having quickly read the Abstract and Motivation, why is this any better
> than a pair of threads and a pair of Queue objects? (Aside from
> co-routines being more lightweight in terms of machine resources?)
> 
> On the flipside, given that generators were recently augumented to
> support coroutines I can see your motivation within that framework.
> 
> Cheers,
> -- 
> Cameron Simpson <cs at zip.com.au> DoD#743
> http://www.cskk.ezoshosting.com/cs/
> 
> C makes it easy for you to shoot yourself in the foot.  C++ makes that
> harder, but when you do, it blows away your whole leg.
> - Bjarne Stroustrup



From jason.heeris at gmail.com  Thu Mar 25 20:49:30 2010
From: jason.heeris at gmail.com (Jason)
Date: Thu, 25 Mar 2010 17:49:30 -0700 (PDT)
Subject: Represent object type as
References: <6a6a37e3-f04f-4b63-9134-7ca9fd137297@f14g2000pre.googlegroups.com>
	<4bab888e$0$26553$426a74cc@news.free.fr>
Message-ID: <cb7c2b1d-d28e-4e28-9284-4d09c7c23167@u19g2000prh.googlegroups.com>

On Mar 26, 12:00?am, Bruno Desthuilliers <bruno.
42.desthuilli... at websiteburo.invalid> wrote:
> ? ? ? ? ? ?attrs['type'] = type(self)
>
> Do the same thing with less work !-)

Ah, silly me :P

> ? ? ?attrs['__typename__'] = type(self).__name__

That's exactly what I needed ? I was not aware of the "__name__"
attribute.

> Warning: won't be very useful if your code still uses old-style classes.

No, all the objects are new-style classes so that's fine.

> Depends on what you do with this dict, DBUS etc. And of your definition
> of "better", of course.

Simplest possible :P But this looks like it, so thanks very much :)

Cheers,
Jason


From anand.shashwat at gmail.com  Thu Mar 25 20:59:33 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Fri, 26 Mar 2010 06:29:33 +0530
Subject: Traversing through Dir()
In-Reply-To: <d2459161-1a78-4380-8687-1497c9349a9d@g11g2000yqe.googlegroups.com>
References: <d2459161-1a78-4380-8687-1497c9349a9d@g11g2000yqe.googlegroups.com>
Message-ID: <d4ab53de1003251759g68379f7ft8dd0b8678d1a2501@mail.gmail.com>

have you tried os.walk() ?

On Fri, Mar 26, 2010 at 5:55 AM, Andrej Mitrovic <andrej.mitrovich at gmail.com
> wrote:

> I would like to traverse through the entire structure of dir(), and
> write it to a file.
>
> Now, if I try to write the contents of dir() to a file (via pickle), I
> only get the top layer. So even if there are lists within the returned
> list from dir(), they get written as a list of strings to the file.
>
> Basically, I have an embedded and somewhat stripped version of Python.
> I would like to find out just how much functionality it has (I have no
> documentation for it), so I thought the best way to do that is
> traverse thru the dir() call. Any clues as to how I could write the
> whole structure to a file? I guess I'll need some kind of recursion
> here. :)
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From nocbos at gmail.com  Thu Mar 25 21:03:58 2010
From: nocbos at gmail.com (C. B.)
Date: Thu, 25 Mar 2010 18:03:58 -0700 (PDT)
Subject: Automatic import ?
Message-ID: <4d167b6b-04fb-42bb-9c21-ab66d0fb4367@k17g2000yqb.googlegroups.com>

Hi everyone,

I'm currently coding a C library which provides several modules and
objects.

Let's say that some of these objects are classes called AAA and BBB.
The constructor of AAA needs to get BBB as argument.

So I can run the following code :

from mymodule import AAA
from mymodule import BBB

a = AAA(BBB()))

But, as there is no case where AAA can be used without BBB, I would
like to avoid importing BBB in my Python scripts when I already import
AAA.

For now, I think that reproducing the behavior of the __init__.py file
could be a good way to do this, but how can I code that using only the
C API ?

Are there any other solutions ? Is this kind of importation a good
idea ?

Greetings,
Cyrille Bagard


From rhodri at wildebst.demon.co.uk  Thu Mar 25 21:10:36 2010
From: rhodri at wildebst.demon.co.uk (Rhodri James)
Date: Fri, 26 Mar 2010 01:10:36 -0000
Subject: Don't understand behavior; instance form a class in another
	class' instance
References: <hogrk1$17k$1@news.eternal-september.org>
	<mailman.1199.1269560532.23598.python-list@python.org>
	<hogtpa$2u8$1@news.eternal-september.org>
Message-ID: <op.u95hjyiya8ncjz@gnudebst>

On Fri, 26 Mar 2010 00:06:06 -0000, Martin P. Hellwig  
<martin.hellwig at dcuktec.org> wrote:

> On 03/25/10 23:41, Christian Heimes wrote:
>> Martin P. Hellwig schrieb:
>>> What I don't understand why in the second test, the last boolean is  
>>> True
>>> instead of (what I expect) False.
>>> Could somebody enlighten me please as this has bitten me before and I  
>>> am
>>> confused by this behavior.
>>
>> Hint: TEST2.one is not a reference to TEST2.__instance_one.one. When you
>> alter TEST2.__instance_one.one you don't magically change TEST2.one,
>> too. Python doesn't have variables like C pointers. Python's copy by
>> object (or share by object) behavior can be understand as labels. The
>> label TEST2.one references the same object as TEST2.__instance_one.one
>> until you change where the label TEST2.__instance_one.one points to.
>>
>> Christian
>>
>
> Ah okay thanks for the explanation, Am I correct in thinking (please  
> correct me if I mangle up the terminology and/or totally are in the  
> wrong ballpark) that this is more or less because the label of the first  
> class is to an object (boolean with value False)
> and the label of the second class does not cascade to the first label  
> for looking something up but instead during assignment sees that it is a  
> label to an object instead of the object itself thus copies the label  
> content instead?

Pretty much.  In the sense that you're thinking of, every assignment works  
that way, even the initial "TEST1 = One()".  Assignment binds names to  
objects, though you have to be aware that names can be such exotic things  
as "t", "a[15]" or "TEST2.__instance_one.one"

> I probably expected classes namespaces to behave in about the same way  
> as lists and dictionaries do, don't know where I picked that up.

They do, in fact, which isn't terribly surprising considering that class  
namespaces are implemented with dictionaries.  The distinction you're  
missing is that lists and dictionaries are mutable, while booleans aren't;  
you can change the contents of a dictionary, but you can't change the  
'contents' of a boolean.

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


From littlesweetmelon at gmail.com  Thu Mar 25 21:45:44 2010
From: littlesweetmelon at gmail.com (=?GB2312?B?zPC5zw==?=)
Date: Fri, 26 Mar 2010 09:45:44 +0800
Subject: Is there any library for indexing binary data?
In-Reply-To: <4babb132$0$22945$e4fe514c@news.xs4all.nl>
References: <mailman.1168.1269487743.23598.python-list@python.org>
	<4bab182a$0$22933$e4fe514c@news.xs4all.nl>
	<mailman.1177.1269510930.23598.python-list@python.org>
	<4babb132$0$22945$e4fe514c@news.xs4all.nl>
Message-ID: <cdb837ea1003251845u76e482c9ua8d16453e0007fdb@mail.gmail.com>

Many thanks for your kind reply. As you mentioned, a sparse array may
be the best choice.
Storing offset rather than payload itself can greatly save memory space.

1e7 queries per second is my ideal aim. But 1e6 must be achieved.
Currently I have implemented 5e6 on one PC (without incremental
indexing and all incoming queries coming from local data stream).
Since the table is very big and responding is time critical, the
finally system will be definitely distributed computing. I hope that
Judy algorithm can simplify indexing, so I can focus on implementing
data persistence and distributed computing affairs.

--
ShenLei

? 2010?3?26? ??2:55?Irmen de Jong <irmen-NOSPAM- at xs4all.nl> ???
> On 25-3-2010 10:55, ?? wrote:
>> Thank you irmen. I will take a look at pytable.
>> FYI, let me explain the case clearly.
>>
>> Originally, my big data table is simply array of Item:
>> struct Item
>> {
>>      long id;    // used as key
>>      BYTE payload[LEN];   // corresponding value with fixed length
>> };
>>
>> All items are stored in one file by using "stdio.h" function:
>>      fwrite(itemarray, sizeof(Item), num_of_items, fp);
>>
>> Note that "id" is randomly unique without any order. To speed up
>> searching  I regrouped / sorted them into two-level hash tables (in
>> the form of files).  I want to employ certain library to help me index
>> this table.
>>
>> Since the table contains about 10^9 items and LEN is about 2KB, it is
>> impossible to hold all data in memory. Furthermore, some new item may
>> be inserted into the array. Therefore incremental indexing feature is
>> needed.
>
> I see, I thought the payload data was small as well. What about this idea:
> Build a hash table where the keys are the id from your Item structs and
> the value is the file seek offset of the Item 'record' in your original
> datafile. (although that might generate values of type long, which take
> more memory than int, so maybe we should use file_offset/sizeof(Item).
> This way you can just keep your original data file (you only have to
> scan it to build the hash table) and you will avoid a lengthy conversion
> process.
>
> If this hashtable still doesn't fit in memory use a sparse array
> implementation of some sort that is more efficient at storing simple
> integers, or just put it into a database solution mentioned in earlier
> responses.
>
> Another thing: I think that your requirement of 1e7 lookups per second
> is a bit steep for any solution where the dataset is not in core memory
> at once though.
>
> Irmen.
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From ivlenin at gmail.com  Thu Mar 25 21:53:04 2010
From: ivlenin at gmail.com (I V)
Date: 26 Mar 2010 02:53:04 +0100
Subject: Create a class at run-time
References: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>
Message-ID: <4bac1380$1@news.x-privat.org>

On Thu, 25 Mar 2010 15:00:35 -0700, Michel wrote:
> I'm trying to dynamically create a class. What I need is to define a
> class, add methods to it and later instantiate this class. Methods need
> to be bound to the instance though, and that's my problem. Here is what
> I have so far:

I'm not entirely sure what you mean by binding methods to the instance. 
Do you mean you need to dynamically add methods to a specific instance? 
Or that you need to add methods to a class, such that they can be invoked 
on specific instances? For the latter, just do:

TestClass.test_foo = test_foo

For the former, try:

tc = TestClass()
tc.test_foo = types.MethodType(test_foo, tc)


From martin.hellwig at dcuktec.org  Thu Mar 25 21:56:38 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Fri, 26 Mar 2010 01:56:38 +0000
Subject: Don't understand behavior; instance form a class in another class'
	instance
In-Reply-To: <op.u95hjyiya8ncjz@gnudebst>
References: <hogrk1$17k$1@news.eternal-september.org>
	<mailman.1199.1269560532.23598.python-list@python.org>
	<hogtpa$2u8$1@news.eternal-september.org>
	<op.u95hjyiya8ncjz@gnudebst>
Message-ID: <hoh48g$ee7$1@news.eternal-september.org>

On 03/26/10 01:10, Rhodri James wrote:
<cut>
>
> Pretty much. In the sense that you're thinking of, every assignment
> works that way, even the initial "TEST1 = One()". Assignment binds names
> to objects, though you have to be aware that names can be such exotic
> things as "t", "a[15]" or "TEST2.__instance_one.one"
>
>> I probably expected classes namespaces to behave in about the same way
>> as lists and dictionaries do, don't know where I picked that up.
>
> They do, in fact, which isn't terribly surprising considering that class
> namespaces are implemented with dictionaries. The distinction you're
> missing is that lists and dictionaries are mutable, while booleans
> aren't; you can change the contents of a dictionary, but you can't
> change the 'contents' of a boolean.
>

All makes sense now, thanks Rhodri & Christian.

-- 
mph


From nagle at animats.com  Thu Mar 25 23:28:19 2010
From: nagle at animats.com (John Nagle)
Date: Thu, 25 Mar 2010 20:28:19 -0700
Subject: Is there any library for indexing binary data?
In-Reply-To: <mailman.1173.1269496428.23598.python-list@python.org>
References: <cdb837ea1003242028u7047f346l7d4f405b609b01ff@mail.gmail.com>	<op.u93v2thgx6zn5v@gabriel.sleipnir-bsas>
	<mailman.1173.1269496428.23598.python-list@python.org>
Message-ID: <4BAC29D3.6020503@animats.com>

?? wrote:
> Well, Database is not proper because 1. the table is very big (~10^9
> rows) 2. we should support very fast *simple* query that is to get
> value corresponding to single key (~10^7 queries / second).

   Ah, crypto rainbow tables.

					John Nagle


From pmaupin at gmail.com  Thu Mar 25 23:30:32 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Thu, 25 Mar 2010 20:30:32 -0700 (PDT)
Subject: Revisiting Generators and Subgenerators
References: <bc11ef60-2d6e-46d7-94b4-ed2096834b33@f12g2000prn.googlegroups.com>
	<20100326002339.GA18453@cskk.homeip.net>
	<mailman.1202.1269563496.23598.python-list@python.org>
Message-ID: <04e65930-889e-4eea-b12c-6bd21a11630a@z3g2000yqz.googlegroups.com>

On Mar 25, 7:31?pm, Winston Wolff <winst... at stratolab.com> wrote:

(a bunch of stuff about coroutines)

There have been proposals in the past for more full-featured
generators, that would work as general purpose coroutines.  Among
other things, there were issues with exception propagation, and the
design was deliberately simplified to what we have today.  Before
proposing anything in this area you should carefully read PEPs 288,
325, and 342, and all the discussion about those PEPs in the python-
dev archives.

After reading all that, and still being convinced that you have the
greatest thing since sliced bread (and that you REALLY understand all
the concerns about exceptions and other things), you need to update
your document to address all the concerns raised in the discussions on
those PEPs, put on your asbestos suit (modern asbestos-free
replacements never work as advertised), and then re-post your
document.

Personally, I am very interested in co-routines, but I have very
little time right now, and am not at all interested in reading a
proposal from somebody who doesn't know the full history of how
generators got to be the way they are (the lack of coroutines is not
an accidental oversight).  I suspect I am not alone in this opinion,
so there is probably some interest in a realistic proposal, but
perhaps also some skepticism about whether a realistic proposal can
actually be engineered...

Best regards and good luck!
Pat


From steve at REMOVE-THIS-cybersource.com.au  Fri Mar 26 00:20:45 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 26 Mar 2010 04:20:45 GMT
Subject: Automatic import ?
References: <4d167b6b-04fb-42bb-9c21-ab66d0fb4367@k17g2000yqb.googlegroups.com>
Message-ID: <4bac361d$0$8840$c3e8da3@news.astraweb.com>

On Thu, 25 Mar 2010 18:03:58 -0700, C. B. wrote:

> Hi everyone,
> 
> I'm currently coding a C library which provides several modules and
> objects.
> 
> Let's say that some of these objects are classes called AAA and BBB. The
> constructor of AAA needs to get BBB as argument.
> 
> So I can run the following code :
> 
> from mymodule import AAA
> from mymodule import BBB
> 
> a = AAA(BBB()))
> 
> But, as there is no case where AAA can be used without BBB, I would like
> to avoid importing BBB in my Python scripts when I already import AAA.

Since AAA must take an argument of BBB, then give it a default:

# in mymodule
def AAA(arg=BBB()):
    ...

# in another module
from mymodule import AAA
a = AAA()


Or do this:

from mymodule import AAA, BBB
a = AAA(BBB())




> For now, I think that reproducing the behavior of the __init__.py file
> could be a good way to do this, but how can I code that using only the C
> API ?

What is the behaviour of the __init__.py file?



-- 
Steven


From stefan_ml at behnel.de  Fri Mar 26 00:51:22 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 26 Mar 2010 05:51:22 +0100
Subject: Revisiting Generators and Subgenerators
In-Reply-To: <04e65930-889e-4eea-b12c-6bd21a11630a@z3g2000yqz.googlegroups.com>
References: <bc11ef60-2d6e-46d7-94b4-ed2096834b33@f12g2000prn.googlegroups.com>	<20100326002339.GA18453@cskk.homeip.net>	<mailman.1202.1269563496.23598.python-list@python.org>
	<04e65930-889e-4eea-b12c-6bd21a11630a@z3g2000yqz.googlegroups.com>
Message-ID: <hohega$i5f$1@dough.gmane.org>

Patrick Maupin, 26.03.2010 04:30:
> ... and then re-post your document.

... preferably to the python-ideas mailing list. Although it seems to me 
that this is something that could be explored as a library first - which 
usually means that people will tell you exactly that on python-ideas and 
ask you to come back with an implementation that has proven to be useful in 
practice.

Stefan



From v.harishankar at gmail.com  Fri Mar 26 02:37:24 2010
From: v.harishankar at gmail.com (Harishankar)
Date: Fri, 26 Mar 2010 12:07:24 +0530
Subject: Question regarding curses and text-input methods
Message-ID: <20100326120724.33e8c2a6@gmail.com>

I am trying to use Python curses.textpad to get (preferably UTF-8 but
not needed) input from the user in a python curses application, but I
realize that it is extremely limited and doesn't allow me to specify an
existing text to edit. Also it doesn't seem to provide scrolling
abilities on the window.

Is this at all possible to get a large chunk of text using curses
module like a GUI textbox or should I look at alternatives like newt?

I prefer curses because it's simple and very flexible, but I am lost
for ideas on this. Any ideas which doesn't involve throwing away the
whole curses interface would be appreciated.

-- 
V.Harishankar

http://literaryforums.org
http://harishankar.org


From kushal.kumaran+python at gmail.com  Fri Mar 26 03:40:26 2010
From: kushal.kumaran+python at gmail.com (Kushal Kumaran)
Date: Fri, 26 Mar 2010 13:10:26 +0530
Subject: Improved timedelta attributes/methods
In-Reply-To: <ded3be3b1003251251o69627c2ct6ed74020bad22c65@mail.gmail.com>
References: <ded3be3b1003251251o69627c2ct6ed74020bad22c65@mail.gmail.com>
Message-ID: <1e364c4e1003260040k1fe336d0lcf33577986f64075@mail.gmail.com>

2010/3/26 Christian ?tef?nescu <st.chris at gmail.com>:
> Hello dear Python-wielding developers!
>
> I generally like date/time handling in Python very much, especially how date
> operations result in Timedelta objects. But I find it somewhat impractical,
> that you can only get days, seconds and microseconds out of a time delta. I
> think it would be much more comfortable to have fields for minutes, hours,
> maybe also years, months. Is there a specific reasoning why this is not
> available?
>
> I would gladly do my best to implement such a solution, if it would make
> sense to the devs.
>

You might want to check out mxDateTime[1].  It has a RelativeDateTime
that seems to do what you like.

[1] http://www.egenix.com/products/python/mxBase/mxDateTime/doc/

-- 
regards,
kushal


From nocbos at gmail.com  Fri Mar 26 04:15:44 2010
From: nocbos at gmail.com (C. B.)
Date: Fri, 26 Mar 2010 01:15:44 -0700 (PDT)
Subject: Automatic import ?
References: 4bac361d$0$8840$c3e8da3@news.astraweb.com
Message-ID: <d61b8901-14c8-449b-9d4e-83dd0c372d80@15g2000yqi.googlegroups.com>


>
> What is the behaviour of the __init__.py file?
>

Not yet used, but I read this file is run by Python when a module of a
package is imported.

So you can insert default importations in it.




From alfps at start.no  Fri Mar 26 04:18:17 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Fri, 26 Mar 2010 09:18:17 +0100
Subject: Traversing through Dir()
In-Reply-To: <d2459161-1a78-4380-8687-1497c9349a9d@g11g2000yqe.googlegroups.com>
References: <d2459161-1a78-4380-8687-1497c9349a9d@g11g2000yqe.googlegroups.com>
Message-ID: <hohqgi$kso$1@news.eternal-september.org>

* Andrej Mitrovic:
> I would like to traverse through the entire structure of dir(), and
> write it to a file.
> 
> Now, if I try to write the contents of dir() to a file (via pickle), I
> only get the top layer. So even if there are lists within the returned
> list from dir(), they get written as a list of strings to the file.
> 
> Basically, I have an embedded and somewhat stripped version of Python.
> I would like to find out just how much functionality it has (I have no
> documentation for it), so I thought the best way to do that is
> traverse thru the dir() call. Any clues as to how I could write the
> whole structure to a file? I guess I'll need some kind of recursion
> here. :)

The built-in dir() function just produces a sequence of strings.

You can inspect the attributes via the getattr() function. The getattr() 
function produces a reference to an object (as does every expression). Problem: 
if you start with the number 42 and apply dir(), do getattr() on the first 
string, apply dir() on that object, and so on, with CPython you then get into an 
infinite recursion because those objects are produced on demand...


<code language="Py3">
obj = 42
obj_name = "42"
for n in range( 12 ):
     where = id( obj )
     t = type( obj ).__name__
     print( "{:>2} {:>10} {:20} of type '{}'".format( n, where, obj_name, t ) )
     attribute_names = dir( obj )
     obj_name = attribute_names[0]
     obj = getattr( obj, obj_name )
</code>


Similarly, if you do this with the Turtle module as starting point, with CPython 
you get into a different kind of infinite recursion because the chain of 
attributes so obtained is circular.


<code langauge="Py3">
import turtle

obj = turtle
obj_name = 'turtle'
for n in range( 12 ):
     where = id( obj )
     t = type( obj ).__name__
     print( "{:>2} {:>10} {:20} of type '{}'".format( n, where, obj_name, t ) )
     attribute_names = dir( obj )
     obj_name = attribute_names[0]
     obj = getattr( obj, obj_name )
</code>


It's not a clean, strict hierarchy of objects.

However, the basic idea is sound when you only want to obtain some limited, 
known information, such as e.g. short descriptions of all string methods, or a 
listing of the standard exception hierarchy.


<code language="Py3">
for attribute_name in dir( str ):
     if attribute_name.startswith( "_" ):
         pass
     else:
         attribute = getattr( str, attribute_name )
         doc_string = attribute.__doc__
         doc_lines = doc_string.splitlines()
         if len( doc_lines ) > 2:
             essential_doc = doc_lines[2]
         else:
             essential_doc = doc_lines[0]
         print( attribute_name.ljust( 15 ) + essential_doc )
</code>


<code language="Py3">
"Lists the standard exception class hierarchy with short descriptions."
import builtins
import inspect

indentation     = "." + 2*" "

def is_type( o ):
     # Could use inspect.isclass for this, but in the DIY spirit:
     return isinstance( o, type )

def beginning_of( s, max_chars ):
     return s[:max_chars]    # Not yet discussed, but doesn't matter.

def print_hierarchy( h, level ):
     for o in h:
         if isinstance( o, tuple ):
             # o is a tuple describing a class
             cls = o[0]
             doc_lines = cls.__doc__.splitlines()
             short_doc = beginning_of( doc_lines[0], 55 )
             print( "{:<34} {}".format(
                 level*indentation + cls.__name__, short_doc
                 ) )
         else:
             # o is a list array of subclasses
             print_hierarchy( o, level + 1 )

classes = []
for name in dir( builtins ):
     o = getattr( builtins, name )
     if is_type( o ):
         if issubclass( o, BaseException ):
             classes.append( o )

hierarchy = inspect.getclasstree( classes )
# 'hierarchy' is a list array of tuples and nested list arrays of the same form.
# The top level is an array of two items, the first item a tuple describing the 
'object'
# class, and the second item a list array representing the BaseException hierarchy.
print_hierarchy( hierarchy[1], level = 0 )
</code>


Cheers & hth.,

- Alf


From michele.simionato at gmail.com  Fri Mar 26 04:22:54 2010
From: michele.simionato at gmail.com (Michele Simionato)
Date: Fri, 26 Mar 2010 01:22:54 -0700 (PDT)
Subject: Advanced Python Programming Oxford Lectures [was: Re: *Advanced* 
	Python book?]
References: mailman.1182.1269520510.23598.python-list@python.org 
	<54e41616-df9f-42dd-9c91-9e530650bd99@j21g2000yqh.googlegroups.com>
Message-ID: <9dd0d6b0-7249-4a6f-8d03-b0c3a44eace2@l25g2000yqd.googlegroups.com>

On Mar 25, 2:24?pm, Michele Simionato <michele.simion... at gmail.com>
wrote:
> On Mar 25, 1:28?pm, Ethan Furman <et... at stoneleaf.us> wrote:
>
>
>
> > Michele,
>
> > Was wondering if you'd had a chance to re-post your lectures -- just did
> > a search for them and came up empty, and I would love to read them!
>
> > Many thanks in advance!
>
> Oops, I forgot! I will try to make them available soon.


Here they are: http://www.phyast.pitt.edu/~micheles/oxford-lectures.zip


From james.harris.1 at googlemail.com  Fri Mar 26 05:49:53 2010
From: james.harris.1 at googlemail.com (James Harris)
Date: Fri, 26 Mar 2010 02:49:53 -0700 (PDT)
Subject: Python database of plain text editable by notepad or vi
References: <93d7991f-d688-4692-b34f-2fa571cebbdf@q15g2000yqj.googlegroups.com>
	<46822448-2984-4ef6-85c7-bef834e2e86c@r1g2000yqj.googlegroups.com>
Message-ID: <3d897b92-9def-4339-ac19-b06b5fb9705e@e6g2000yqh.googlegroups.com>

On 25 Mar, 22:56, Jon Clements <jon... at googlemail.com> wrote:
> On 25 Mar, 22:40, James Harris <james.harri... at googlemail.com> wrote:
>
> > I am looking to store named pieces of text in a form that can be
> > edited by a standard editor such as notepad (under Windows) or vi
> > (under Unix) and then pulled into Python as needed. The usual record
> > locking and transactions of databases are not required.
>
> > Another way to look at it is to treat the separate files as entries in
> > a dictionary. The file name would be the key and the lines of the file
> > the value.
>
> > Anyone know of a database (with a Python interface) which will allow
> > text files to be treated as database fields? If not I can just write
> > it but I thought it best to ask if there was an existing solution
> > first.
...
> I could be missing something here, but aren't you basically just
> talking about an OS's filesystem?

For storage, yes. The files would be marked-up text stored in the
filesystem. The "dbms" (I use the term loosely!) would provide access
to them by some full or partial key mechanism yet to be determined.
Read-only access would do - at least for now.

> glob or listdir somewhere, then create a dict using the file contents
> would meet your criteria, with very little lines of code -- but I
> would be interested to know what the use-case was for this... Is it
> read completely at start up time, or if each file contains a large
> amount of lines and aren't fixed width (or has no other indexing
> support without maintenance), then is a complete sequential-scan
> required each time, or do you just tell the user to not update when
> running (unless I s'pose something along the lines of a SIGHUP for
> config files is applicable).

All good questions. For now, at least, the files can be read-only and
I'd want those on disk to be the master copies at all times. If I was
writing it myself I'd probably 'cache' some files in memory and stat
them before use. If newer I would reread the file.

>
> Sorry, just don't understand why you'd want this.

I tried to avoid boring folks with the details. I'm toying with some
ideas for a way to help generate source code (in various languages,
not just Python). If it goes ahead the text files would be mainly
marked-up code snippets - with or without symbols that need to be
replaced.

Rather than write one single monolithic app I thought to split it into
reusable components. One part being data access could perhaps be an
existing database (and I'll take a look at jkn's suggestion).

Think of the database as similar to an associative array stored on
disk. The only difference is I may want to play fast and loose with
the keys in some ways - e.g. check for partial key matches or return a
list of part-matched keys. The language name could be part of the key
but I'd also need to store variants for specific language versions.
I'm not sure yet how it will all pan out. As I say, just throwing
around some ideas.

James


From almar.klein at gmail.com  Fri Mar 26 05:52:51 2010
From: almar.klein at gmail.com (Almar Klein)
Date: Fri, 26 Mar 2010 10:52:51 +0100
Subject: Python database of plain text editable by notepad or vi
In-Reply-To: <93d7991f-d688-4692-b34f-2fa571cebbdf@q15g2000yqj.googlegroups.com>
References: <93d7991f-d688-4692-b34f-2fa571cebbdf@q15g2000yqj.googlegroups.com>
Message-ID: <p2gcc38d75f1003260252lfa0bcd4ah18b32daae19ded96@mail.gmail.com>

Hi,

On 25 March 2010 23:40, James Harris <james.harris.1 at googlemail.com> wrote:

> I am looking to store named pieces of text in a form that can be
> edited by a standard editor such as notepad (under Windows) or vi
> (under Unix) and then pulled into Python as needed. The usual record
> locking and transactions of databases are not required.
>

I wrote a file format and parser for Python and Matlab that enables saving
structured data in a human readable file. I use it to store all kinds of
scientific data, but also for ini-like files for certain applications.
Implementations and more information can be obtained here:
http://code.google.com/p/ssdf/

It's not a database in the sense that you can query it, but it might be
enough for your needs; it can store named pieces of (unicode) text.

Cheers,
  Almar
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From gandalf at shopzeus.com  Fri Mar 26 05:57:53 2010
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Fri, 26 Mar 2010 10:57:53 +0100
Subject: sqlite version on windows
Message-ID: <4BAC8521.2@shopzeus.com>


   Hi All,

On my Linux system: Python version: 2.6.2 sqlite3.sqlite_version: 3.6.10
On my Windows system: Python version: 2.6.5 sqlite3.sqlite_version: 3.5.9

Why is that? I wrote a program that uses SAVEPOINT/ROLLBACK to. It is 
only available in SQLite 3.6.8 and above. Can I install it on Windows 
somehow?

Thanks,

    Laszlo




From v.harishankar at gmail.com  Fri Mar 26 06:04:51 2010
From: v.harishankar at gmail.com (Harishankar)
Date: Fri, 26 Mar 2010 15:34:51 +0530
Subject: Python database of plain text editable by notepad or vi
In-Reply-To: <3d897b92-9def-4339-ac19-b06b5fb9705e@e6g2000yqh.googlegroups.com>
References: <93d7991f-d688-4692-b34f-2fa571cebbdf@q15g2000yqj.googlegroups.com>
	<46822448-2984-4ef6-85c7-bef834e2e86c@r1g2000yqj.googlegroups.com>
	<3d897b92-9def-4339-ac19-b06b5fb9705e@e6g2000yqh.googlegroups.com>
Message-ID: <20100326153451.1fae9524@gmail.com>

On Fri, 26 Mar 2010 02:49:53 -0700 (PDT)
James Harris <james.harris.1 at googlemail.com> wrote:

> On 25 Mar, 22:56, Jon Clements <jon... at googlemail.com> wrote:
> > On 25 Mar, 22:40, James Harris <james.harri... at googlemail.com>
> > wrote:
> >
> > > I am looking to store named pieces of text in a form that can be
> > > edited by a standard editor such as notepad (under Windows) or vi
> > > (under Unix) and then pulled into Python as needed. The usual
> > > record locking and transactions of databases are not required.
> >
> > > Another way to look at it is to treat the separate files as
> > > entries in a dictionary. The file name would be the key and the
> > > lines of the file the value.
> >
> > > Anyone know of a database (with a Python interface) which will
> > > allow text files to be treated as database fields? If not I can
> > > just write it but I thought it best to ask if there was an
> > > existing solution first.
> ...
> > I could be missing something here, but aren't you basically just
> > talking about an OS's filesystem?
> 
> For storage, yes. The files would be marked-up text stored in the
> filesystem. The "dbms" (I use the term loosely!) would provide access
> to them by some full or partial key mechanism yet to be determined.
> Read-only access would do - at least for now.
> 
> > glob or listdir somewhere, then create a dict using the file
> > contents would meet your criteria, with very little lines of code
> > -- but I would be interested to know what the use-case was for
> > this... Is it read completely at start up time, or if each file
> > contains a large amount of lines and aren't fixed width (or has no
> > other indexing support without maintenance), then is a complete
> > sequential-scan required each time, or do you just tell the user to
> > not update when running (unless I s'pose something along the lines
> > of a SIGHUP for config files is applicable).
> 
> All good questions. For now, at least, the files can be read-only and
> I'd want those on disk to be the master copies at all times. If I was
> writing it myself I'd probably 'cache' some files in memory and stat
> them before use. If newer I would reread the file.
> 
> >
> > Sorry, just don't understand why you'd want this.
> 
> I tried to avoid boring folks with the details. I'm toying with some
> ideas for a way to help generate source code (in various languages,
> not just Python). If it goes ahead the text files would be mainly
> marked-up code snippets - with or without symbols that need to be
> replaced.
> 
> Rather than write one single monolithic app I thought to split it into
> reusable components. One part being data access could perhaps be an
> existing database (and I'll take a look at jkn's suggestion).
> 
> Think of the database as similar to an associative array stored on
> disk. The only difference is I may want to play fast and loose with
> the keys in some ways - e.g. check for partial key matches or return a
> list of part-matched keys. The language name could be part of the key
> but I'd also need to store variants for specific language versions.
> I'm not sure yet how it will all pan out. As I say, just throwing
> around some ideas.
> 
> James

I am not sure exactly what you need, but would you consider using
something like ConfigParser module provided by Python? It appears to be
something similar to what you need.


-- 
V.Harishankar

http://literaryforums.org
http://harishankar.org


From james.harris.1 at googlemail.com  Fri Mar 26 06:12:57 2010
From: james.harris.1 at googlemail.com (James Harris)
Date: Fri, 26 Mar 2010 03:12:57 -0700 (PDT)
Subject: Python database of plain text editable by notepad or vi
References: mailman.1210.1269597926.23598.python-list@python.org
Message-ID: <df5021bf-46a8-40e0-9888-1bcce3d0dd48@15g2000yqi.googlegroups.com>

On 26 Mar, 10:04, Harishankar <v.harishan... at gmail.com> wrote:
...
> > Think of the database as similar to an associative array stored on
> > disk. The only difference is I may want to play fast and loose with
> > the keys in some ways - e.g. check for partial key matches or return a
> > list of part-matched keys. The language name could be part of the key
> > but I'd also need to store variants for specific language versions.
> > I'm not sure yet how it will all pan out. As I say, just throwing
> > around some ideas.
...
> I am not sure exactly what you need, but would you consider using
> something like ConfigParser module provided by Python? It appears to be
> something similar to what you need.

Thanks, I'll take a look at it.

James


From gandalf at shopzeus.com  Fri Mar 26 07:11:26 2010
From: gandalf at shopzeus.com (Laszlo Nagy)
Date: Fri, 26 Mar 2010 12:11:26 +0100
Subject: sqlite version on windows
In-Reply-To: <4BAC8521.2@shopzeus.com>
References: <4BAC8521.2@shopzeus.com>
Message-ID: <4BAC965E.70302@shopzeus.com>

2010.03.26. 10:57 keltez?ssel, Laszlo Nagy ?rta:
>
>   Hi All,
>
> On my Linux system: Python version: 2.6.2 sqlite3.sqlite_version: 3.6.10
> On my Windows system: Python version: 2.6.5 sqlite3.sqlite_version: 3.5.9
>
> Why is that? I wrote a program that uses SAVEPOINT/ROLLBACK to. It is 
> only available in SQLite 3.6.8 and above. Can I install it on Windows 
> somehow?
Hmm. Looks like I only needed to download a new sqlite3.dll file and put 
it into Python26\DLLs

Why it is not included in the standard distribution? The default 
installed version 3.5.9 is quite old.

Is there a special reason for that? Or do you think that I can post a patch?

Thanks,

    Laszlo





From ovidiudeac at gmail.com  Fri Mar 26 07:14:01 2010
From: ovidiudeac at gmail.com (Ovidiu Deac)
Date: Fri, 26 Mar 2010 13:14:01 +0200
Subject: Automatic import ?
In-Reply-To: <4d167b6b-04fb-42bb-9c21-ab66d0fb4367@k17g2000yqb.googlegroups.com>
References: <4d167b6b-04fb-42bb-9c21-ab66d0fb4367@k17g2000yqb.googlegroups.com>
Message-ID: <804cd4021003260414t5c5b7482vf315a2e596d3916c@mail.gmail.com>

> But, as there is no case where AAA can be used without BBB, I would
> like to avoid importing BBB in my Python scripts when I already import
> AAA.

Then why do you need to explicitely pass BBB() to AAA constructor? You
could leave AAA constructor with no parameters or with a parameter
with a default BBB() value


From steve at holdenweb.com  Fri Mar 26 07:49:25 2010
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 26 Mar 2010 07:49:25 -0400
Subject: Revisiting Generators and Subgenerators
In-Reply-To: <bc11ef60-2d6e-46d7-94b4-ed2096834b33@f12g2000prn.googlegroups.com>
References: <bc11ef60-2d6e-46d7-94b4-ed2096834b33@f12g2000prn.googlegroups.com>
Message-ID: <hoi705$qd4$1@dough.gmane.org>

Winston wrote:
[...]
>     This new syntax for a generator will break all existing
>     programs. But we happen to be at the start of Python 3K where
>     new paradaigms are
>     being examined.

However good your idea may be, I suspect this one sentence will kill it.

We are no longer "at the start of Py3k", we are moving towards the third
release, and there is already a substantial body of code and literature
embodying the current syntax.

So you would need to reformulate your proposals to incorporate backward
compatibility.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From jeanmichel at sequans.com  Fri Mar 26 08:35:58 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 26 Mar 2010 13:35:58 +0100
Subject: Automatic import ?
In-Reply-To: <4d167b6b-04fb-42bb-9c21-ab66d0fb4367@k17g2000yqb.googlegroups.com>
References: <4d167b6b-04fb-42bb-9c21-ab66d0fb4367@k17g2000yqb.googlegroups.com>
Message-ID: <4BACAA2E.6010402@sequans.com>

C. B. wrote:
> Hi everyone,
>
> I'm currently coding a C library which provides several modules and
> objects.
>
> Let's say that some of these objects are classes called AAA and BBB.
> The constructor of AAA needs to get BBB as argument.
>
> So I can run the following code :
>
> from mymodule import AAA
> from mymodule import BBB
>
> a = AAA(BBB()))
>
> But, as there is no case where AAA can be used without BBB, I would
> like to avoid importing BBB in my Python scripts when I already import
> AAA.
>
> For now, I think that reproducing the behavior of the __init__.py file
> could be a good way to do this, but how can I code that using only the
> C API ?
>
> Are there any other solutions ? Is this kind of importation a good
> idea ?
>
> Greetings,
> Cyrille Bagard
>   
Make AAA do the call to BBB:

def AAA(*args, **kwargs):
    param = BBB(*args, **kwargs)
    # more code

from mymodule import AAA

AAA(1,2,3) # list of parameters you would have used with BBB.

Saying that, is there any strong reason (meaning design issue) why you don't want to import explicitly BBB ?
Because if the reason is 'It takes too much time', then it's a bad reason.

Cheers,

JM






From philip at semanchuk.com  Fri Mar 26 08:57:47 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Fri, 26 Mar 2010 08:57:47 -0400
Subject: sqlite version on windows
In-Reply-To: <4BAC8521.2@shopzeus.com>
References: <4BAC8521.2@shopzeus.com>
Message-ID: <F9B601F5-CB92-4936-9C4D-7CFC0A41FA21@semanchuk.com>


On Mar 26, 2010, at 5:57 AM, Laszlo Nagy wrote:

>
>  Hi All,
>
> On my Linux system: Python version: 2.6.2 sqlite3.sqlite_version:  
> 3.6.10
> On my Windows system: Python version: 2.6.5 sqlite3.sqlite_version:  
> 3.5.9
>
> Why is that? I wrote a program that uses SAVEPOINT/ROLLBACK to. It  
> is only available in SQLite 3.6.8 and above. Can I install it on  
> Windows somehow?

I did a little research on this for Python 2.5. What I found is that  
The Python distributions for Windows from python.org are conservative  
with their SQLite version. For instance, Python 2.5.0 and 2.5.4 ship  
with the exact same SQLite version (3.3.4, from February 2006).

Our application dependencies state a minimum Python of 2.5. We have to  
work with the lowest common denominator (2.5.0), so we can't use any  
SQLite features that showed up after 3.3.4.

The few Linux distros that I checked are much more aggressive about  
bundling newer versions of SQLite. For instance, Ubuntu 8.04 has  
Python 2.5.2 with SQLite 3.4.2, while Ubuntu 8.10 has the same version  
of Python but offers SQLite 3.5.9.

You asked "why" and I don't know. I imagine it comes down to  
philosophical differences or maybe just a lack of time to test when  
building new WIndows distros for Python.org.

bye
Philip


From luismgz at gmail.com  Fri Mar 26 09:14:49 2010
From: luismgz at gmail.com (=?ISO-8859-1?Q?Luis_M=2E_Gonz=E1lez?=)
Date: Fri, 26 Mar 2010 06:14:49 -0700 (PDT)
Subject: OT: Meaning of "monkey"
Message-ID: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>

Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...

Monkeys everywhere.
Sorry for the off topic question, but what does "monkey" mean in a
nerdy-geek context??

Luis


From v.harishankar at gmail.com  Fri Mar 26 09:23:25 2010
From: v.harishankar at gmail.com (Harishankar)
Date: Fri, 26 Mar 2010 13:23:25 +0000 (UTC)
Subject: Have you embraced Python 3.x yet?
Message-ID: <hoicgd$23v0$1@news.telesweet.net>

Have you people embraced Python 3.x or still with 2.5 or 2.6? 

I personally want to switch over but not too sure how many people are 
using 3.x as opposed to 2 so I want to keep my programs compatible for 
the majority.

-- Hari


From kushal.kumaran+python at gmail.com  Fri Mar 26 09:25:41 2010
From: kushal.kumaran+python at gmail.com (Kushal Kumaran)
Date: Fri, 26 Mar 2010 18:55:41 +0530
Subject: OT: Meaning of "monkey"
In-Reply-To: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
Message-ID: <1e364c4e1003260625u4e747b23g566b0082cb24b6b6@mail.gmail.com>

2010/3/26 Luis M. Gonz?lez <luismgz at gmail.com>:
> Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
> Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
>
> Monkeys everywhere.
> Sorry for the off topic question, but what does "monkey" mean in a
> nerdy-geek context??
>

These might help you get the gist:

http://www.catb.org/~esr/jargon/html/C/code-monkey.html
http://www.catb.org/~esr/jargon/html/T/tape-monkey.html

-- 
regards,
kushal


From mehgcap at gmail.com  Fri Mar 26 09:29:05 2010
From: mehgcap at gmail.com (Alex Hall)
Date: Fri, 26 Mar 2010 09:29:05 -0400
Subject: Have you embraced Python 3.x yet?
In-Reply-To: <hoicgd$23v0$1@news.telesweet.net>
References: <hoicgd$23v0$1@news.telesweet.net>
Message-ID: <bc7f680c1003260629m44b3d511rc06012d367ec92cd@mail.gmail.com>

Because of compatibility, and many modules being built for 2.6 only, I
am still on 2.6.4 (updating to .5 soon).

On 3/26/10, Harishankar <v.harishankar at gmail.com> wrote:
> Have you people embraced Python 3.x or still with 2.5 or 2.6?
>
> I personally want to switch over but not too sure how many people are
> using 3.x as opposed to 2 so I want to keep my programs compatible for
> the majority.
>
> -- Hari
> --
> http://mail.python.org/mailman/listinfo/python-list
>


-- 
Have a great day,
Alex (msg sent from GMail website)
mehgcap at gmail.com; http://www.facebook.com/mehgcap


From neilc at norwich.edu  Fri Mar 26 09:34:35 2010
From: neilc at norwich.edu (Neil Cerutti)
Date: 26 Mar 2010 13:34:35 GMT
Subject: Have you embraced Python 3.x yet?
References: <hoicgd$23v0$1@news.telesweet.net>
Message-ID: <813rfbFi0kU1@mid.individual.net>

On 2010-03-26, Harishankar <v.harishankar at gmail.com> wrote:
> Have you people embraced Python 3.x or still with 2.5 or 2.6? 
>
> I personally want to switch over but not too sure how many
> people are using 3.x as opposed to 2 so I want to keep my
> programs compatible for the majority.

I switched 6 months ago, or so. My library needs are met by
what's in CPython, so I couldn't see, at the time, a good reason
to sit still.

My programs didn't take much effort to convert. They are nearly
all data conversion programs. Microsoft rendering the one outside
module I did use, an Excel reader, obsolete caused me a lot more
trouble than switching from 2.5 to 3.1.

Past advice in this forum has been that as long as you don't
depend on libraries that don't yet support Python 3, you can
probably switch over and not need to look back.

-- 
Neil Cerutti


From anand.shashwat at gmail.com  Fri Mar 26 09:35:54 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Fri, 26 Mar 2010 19:05:54 +0530
Subject: OT: Meaning of "monkey"
In-Reply-To: <1e364c4e1003260625u4e747b23g566b0082cb24b6b6@mail.gmail.com>
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
	<1e364c4e1003260625u4e747b23g566b0082cb24b6b6@mail.gmail.com>
Message-ID: <d4ab53de1003260635j64e8e333ra382e12ab50518d1@mail.gmail.com>

evolved monkey = human (can relate codemonkey to it)

2010/3/26 Kushal Kumaran
<kushal.kumaran+python at gmail.com<kushal.kumaran%2Bpython at gmail.com>
>

> 2010/3/26 Luis M. Gonz?lez <luismgz at gmail.com>:
> > Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
> > Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
> >
> > Monkeys everywhere.
> > Sorry for the off topic question, but what does "monkey" mean in a
> > nerdy-geek context??
> >
>
> These might help you get the gist:
>
> http://www.catb.org/~esr/jargon/html/C/code-monkey.html
> http://www.catb.org/~esr/jargon/html/T/tape-monkey.html
>
> --
> regards,
> kushal
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From anand.shashwat at gmail.com  Fri Mar 26 09:37:13 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Fri, 26 Mar 2010 19:07:13 +0530
Subject: Have you embraced Python 3.x yet?
In-Reply-To: <bc7f680c1003260629m44b3d511rc06012d367ec92cd@mail.gmail.com>
References: <hoicgd$23v0$1@news.telesweet.net>
	<bc7f680c1003260629m44b3d511rc06012d367ec92cd@mail.gmail.com>
Message-ID: <d4ab53de1003260637t63ecf069t6bf030ff1116873d@mail.gmail.com>

2.6.x is what most applications rely on. It is still too early for python 3

On Fri, Mar 26, 2010 at 6:59 PM, Alex Hall <mehgcap at gmail.com> wrote:

> Because of compatibility, and many modules being built for 2.6 only, I
> am still on 2.6.4 (updating to .5 soon).
>
> On 3/26/10, Harishankar <v.harishankar at gmail.com> wrote:
> > Have you people embraced Python 3.x or still with 2.5 or 2.6?
> >
> > I personally want to switch over but not too sure how many people are
> > using 3.x as opposed to 2 so I want to keep my programs compatible for
> > the majority.
> >
> > -- Hari
> > --
> > http://mail.python.org/mailman/listinfo/python-list
> >
>
>
> --
> Have a great day,
> Alex (msg sent from GMail website)
> mehgcap at gmail.com; http://www.facebook.com/mehgcap
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From anand.shashwat at gmail.com  Fri Mar 26 09:37:13 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Fri, 26 Mar 2010 19:07:13 +0530
Subject: Have you embraced Python 3.x yet?
In-Reply-To: <bc7f680c1003260629m44b3d511rc06012d367ec92cd@mail.gmail.com>
References: <hoicgd$23v0$1@news.telesweet.net>
	<bc7f680c1003260629m44b3d511rc06012d367ec92cd@mail.gmail.com>
Message-ID: <d4ab53de1003260637t63ecf069t6bf030ff1116873d@mail.gmail.com>

2.6.x is what most applications rely on. It is still too early for python 3

On Fri, Mar 26, 2010 at 6:59 PM, Alex Hall <mehgcap at gmail.com> wrote:

> Because of compatibility, and many modules being built for 2.6 only, I
> am still on 2.6.4 (updating to .5 soon).
>
> On 3/26/10, Harishankar <v.harishankar at gmail.com> wrote:
> > Have you people embraced Python 3.x or still with 2.5 or 2.6?
> >
> > I personally want to switch over but not too sure how many people are
> > using 3.x as opposed to 2 so I want to keep my programs compatible for
> > the majority.
> >
> > -- Hari
> > --
> > http://mail.python.org/mailman/listinfo/python-list
> >
>
>
> --
> Have a great day,
> Alex (msg sent from GMail website)
> mehgcap at gmail.com; http://www.facebook.com/mehgcap
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From jeanmichel at sequans.com  Fri Mar 26 09:53:26 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 26 Mar 2010 14:53:26 +0100
Subject: python logging writes an empty file
In-Reply-To: <804cd4021003251711p5c1ec832pf2b98da8f19bef1e@mail.gmail.com>
References: <804cd4021003251711p5c1ec832pf2b98da8f19bef1e@mail.gmail.com>
Message-ID: <4BACBC56.1020105@sequans.com>

Ovidiu Deac wrote:
> Then I tried this:
>     file = logging.FileHandler(logFileBasename, 'w')
>     file.setLevel(logging.INFO)
>     # set a format which is simpler for console use
>     formatter = logging.Formatter('%(asctime)s %(name)-12s
> %(levelname)-8s %(message)s',)
>     # tell the handler to use this format
>     file.setFormatter(formatter)
>     # add the handler to the root logger
>     logging.getLogger('').addHandler(file)
>     logging.getLogger('')
>
> ...which also leaves my output file EMPTY.
>
> I'm out of ideas. Can anybody help me with this?
>
> Thanks in advance!
> ovidiu
>   
You set le level of your handler, but did not set the level of the 
logger itself.
Replace file.setLevel(logging.INFO) by 
logging.getLogger().setLevel(logging.INFO)

Log events are matched versus the logger level 1st, then the handler 
level (if applicable). Most of the time you don't need to tune your 
handler levels.

JM



From incensedprey at gmail.com  Fri Mar 26 10:05:52 2010
From: incensedprey at gmail.com (Kevin Adams)
Date: Fri, 26 Mar 2010 07:05:52 -0700 (PDT)
Subject: [python3]
References: <e6ed708b-c010-451d-8de7-8a885c788d4b@t20g2000yqe.googlegroups.com>
	<ho0f44$7m8$1@dough.gmane.org>
	<mailman.984.1269025399.23598.python-list@python.org>
Message-ID: <f8aefa16-b634-4f39-afe1-beb8d30d553a@q23g2000yqd.googlegroups.com>

On Mar 19, 3:02?pm, Terry Reedy <tjre... at udel.edu> wrote:
> On 3/19/2010 2:17 PM, Steve Holden wrote:
>
>
>
> > Kevin Adams wrote:
> >> Greetings!
>
> >> Please forgive me if im posting this to the wrong group.
>
> >> I'm new to Python, learning Python3 from the O'rielly "Learning
> >> Python" book. ?Reading
> >> about operator overloading, specifically __getitem__. ? I put together
> >> a small bit of code to
> >> do some experimenting and threw in a timer so i can see it do its
> >> thing. ?For some reason
> >> the time.sleep(x) function doesnt work when my print function includes
> >> "end=''".
>
> >> Thanks in advance for any help.
>
> > Try the following changes:
>
> >> ---code---
>
> >> class TestClass():
> >> ? ? ?def __init__(self):
> >> ? ? ? ? ?self.data = "I was far from home and the spell of the eastern
> >> sea was upon me."
>
> >> ? ? ?def __getitem__(self,i):
> >> ? ? ? ? ?return self.data[i]
>
> >> import time
>
> > import sys
>
> >> if __name__ == "__main__":
>
> >> ? ? ?me = TestClass()
> >> ? ? ?for x in me:
> >> ? ? ? ? ?print(x,end='') ?#if i remove the 'end=''' ?it performs as i'd
> >> expect
> > ? ? ? ? ? ?sys.stdout.flush()
>
> >> ? ? ? ? ?time.sleep(int(2))
>
> > It may just be that the output is being held in buffers until the
> > program terminates. the fluch() methof pushes it straight out.
>
> The IDLE Shell window must get print output back from the pythonw
> process without buffering. When I cut and pasted from IDLE editor to
> standard interpreter window, output was bunched after several seconds.
> OP should have started with short string and minimal delay so output
> would not take a whole minute. Flushing fixed problem in standard
> interpreter. I will have to remember that testing partial line output in
> IDLE does not show how it will act elsewhere.
>
> Kevin: when reporting a problem, be more specific as to what 'does not
> work' means.
>
> Terry Jan Reedy

Terry:  Will definately try to be more informative next time.   Thanks
again.

K


From andrej.mitrovich at gmail.com  Fri Mar 26 10:16:47 2010
From: andrej.mitrovich at gmail.com (Andrej Mitrovic)
Date: Fri, 26 Mar 2010 07:16:47 -0700 (PDT)
Subject: Traversing through Dir()
References: <d2459161-1a78-4380-8687-1497c9349a9d@g11g2000yqe.googlegroups.com>
	<hohqgi$kso$1@news.eternal-september.org>
Message-ID: <d0fa7167-86e7-4ffa-953e-67b3c07b5f2d@q21g2000yqm.googlegroups.com>

On Mar 26, 9:18?am, "Alf P. Steinbach" <al... at start.no> wrote:
> * Andrej Mitrovic:
>
> > I would like to traverse through the entire structure of dir(), and
> > write it to a file.
>
> > Now, if I try to write the contents of dir() to a file (via pickle), I
> > only get the top layer. So even if there are lists within the returned
> > list from dir(), they get written as a list of strings to the file.
>
> > Basically, I have an embedded and somewhat stripped version of Python.
> > I would like to find out just how much functionality it has (I have no
> > documentation for it), so I thought the best way to do that is
> > traverse thru the dir() call. Any clues as to how I could write the
> > whole structure to a file? I guess I'll need some kind of recursion
> > here. :)
>
> The built-in dir() function just produces a sequence of strings.
>
> You can inspect the attributes via the getattr() function. The getattr()
> function produces a reference to an object (as does every expression). Problem:
> if you start with the number 42 and apply dir(), do getattr() on the first
> string, apply dir() on that object, and so on, with CPython you then get into an
> infinite recursion because those objects are produced on demand...
>
> <code language="Py3">
> obj = 42
> obj_name = "42"
> for n in range( 12 ):
> ? ? ?where = id( obj )
> ? ? ?t = type( obj ).__name__
> ? ? ?print( "{:>2} {:>10} {:20} of type '{}'".format( n, where, obj_name, t ) )
> ? ? ?attribute_names = dir( obj )
> ? ? ?obj_name = attribute_names[0]
> ? ? ?obj = getattr( obj, obj_name )
> </code>
>
> Similarly, if you do this with the Turtle module as starting point, with CPython
> you get into a different kind of infinite recursion because the chain of
> attributes so obtained is circular.
>
> <code langauge="Py3">
> import turtle
>
> obj = turtle
> obj_name = 'turtle'
> for n in range( 12 ):
> ? ? ?where = id( obj )
> ? ? ?t = type( obj ).__name__
> ? ? ?print( "{:>2} {:>10} {:20} of type '{}'".format( n, where, obj_name, t ) )
> ? ? ?attribute_names = dir( obj )
> ? ? ?obj_name = attribute_names[0]
> ? ? ?obj = getattr( obj, obj_name )
> </code>
>
> It's not a clean, strict hierarchy of objects.
>
> However, the basic idea is sound when you only want to obtain some limited,
> known information, such as e.g. short descriptions of all string methods, or a
> listing of the standard exception hierarchy.
>
> <code language="Py3">
> for attribute_name in dir( str ):
> ? ? ?if attribute_name.startswith( "_" ):
> ? ? ? ? ?pass
> ? ? ?else:
> ? ? ? ? ?attribute = getattr( str, attribute_name )
> ? ? ? ? ?doc_string = attribute.__doc__
> ? ? ? ? ?doc_lines = doc_string.splitlines()
> ? ? ? ? ?if len( doc_lines ) > 2:
> ? ? ? ? ? ? ?essential_doc = doc_lines[2]
> ? ? ? ? ?else:
> ? ? ? ? ? ? ?essential_doc = doc_lines[0]
> ? ? ? ? ?print( attribute_name.ljust( 15 ) + essential_doc )
> </code>
>
> <code language="Py3">
> "Lists the standard exception class hierarchy with short descriptions."
> import builtins
> import inspect
>
> indentation ? ? = "." + 2*" "
>
> def is_type( o ):
> ? ? ?# Could use inspect.isclass for this, but in the DIY spirit:
> ? ? ?return isinstance( o, type )
>
> def beginning_of( s, max_chars ):
> ? ? ?return s[:max_chars] ? ?# Not yet discussed, but doesn't matter.
>
> def print_hierarchy( h, level ):
> ? ? ?for o in h:
> ? ? ? ? ?if isinstance( o, tuple ):
> ? ? ? ? ? ? ?# o is a tuple describing a class
> ? ? ? ? ? ? ?cls = o[0]
> ? ? ? ? ? ? ?doc_lines = cls.__doc__.splitlines()
> ? ? ? ? ? ? ?short_doc = beginning_of( doc_lines[0], 55 )
> ? ? ? ? ? ? ?print( "{:<34} {}".format(
> ? ? ? ? ? ? ? ? ?level*indentation + cls.__name__, short_doc
> ? ? ? ? ? ? ? ? ?) )
> ? ? ? ? ?else:
> ? ? ? ? ? ? ?# o is a list array of subclasses
> ? ? ? ? ? ? ?print_hierarchy( o, level + 1 )
>
> classes = []
> for name in dir( builtins ):
> ? ? ?o = getattr( builtins, name )
> ? ? ?if is_type( o ):
> ? ? ? ? ?if issubclass( o, BaseException ):
> ? ? ? ? ? ? ?classes.append( o )
>
> hierarchy = inspect.getclasstree( classes )
> # 'hierarchy' is a list array of tuples and nested list arrays of the same form.
> # The top level is an array of two items, the first item a tuple describing the
> 'object'
> # class, and the second item a list array representing the BaseException hierarchy.
> print_hierarchy( hierarchy[1], level = 0 )
> </code>
>
> Cheers & hth.,
>
> - Alf

Thanks for all of that. And yes, I've noticed I get into infinite
recursions all the time, which is why I was asking if there was a
simple way to do this. I'll have a look at these later.

Kind regards,
Andrej Mitrovic


From andrej.mitrovich at gmail.com  Fri Mar 26 10:22:40 2010
From: andrej.mitrovich at gmail.com (Andrej Mitrovic)
Date: Fri, 26 Mar 2010 07:22:40 -0700 (PDT)
Subject: Have you embraced Python 3.x yet?
References: <hoicgd$23v0$1@news.telesweet.net>
Message-ID: <d0515b95-df2e-4c9c-a9e7-4a1a16437870@r27g2000yqn.googlegroups.com>

I use both, really. I started by learning and using Python 3, but I
ended up using Python 2 much more often compared to Py3. Not because
of the functionality of the language, but because most software that
embeds Python or is extendable in some way is usually using Python 2.
+ There's the whole libraries issue (or the lack of them).

But I have to say, Python 3 is a sexy language, I can't wait for more
libraries to appear so I could focus more of my attention there.


From kw at codebykevin.com  Fri Mar 26 10:28:12 2010
From: kw at codebykevin.com (Kevin Walzer)
Date: Fri, 26 Mar 2010 10:28:12 -0400
Subject: Have you embraced Python 3.x yet?
In-Reply-To: <hoicgd$23v0$1@news.telesweet.net>
References: <hoicgd$23v0$1@news.telesweet.net>
Message-ID: <5dda4$4bacc47c$4275d90a$1703@FUSE.NET>

On 3/26/10 9:23 AM, Harishankar wrote:
> Have you people embraced Python 3.x or still with 2.5 or 2.6?
>
> I personally want to switch over but not too sure how many people are
> using 3.x as opposed to 2 so I want to keep my programs compatible for
> the majority.
>
> -- Hari

Not yet. Some key libraries I am using for apps under development 
haven't been ported to support 3.x yet (feedparser, pycrypto).

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


From ovidiudeac at gmail.com  Fri Mar 26 10:29:43 2010
From: ovidiudeac at gmail.com (Ovidiu Deac)
Date: Fri, 26 Mar 2010 16:29:43 +0200
Subject: python logging writes an empty file
In-Reply-To: <4BACBC56.1020105@sequans.com>
References: <804cd4021003251711p5c1ec832pf2b98da8f19bef1e@mail.gmail.com>
	<4BACBC56.1020105@sequans.com>
Message-ID: <804cd4021003260729t150ffdd3m1f30fc1bdea138ca@mail.gmail.com>

> You set le level of your handler, but did not set the level of the logger
> itself.
> Replace file.setLevel(logging.INFO) by
> logging.getLogger().setLevel(logging.INFO)
>
> Log events are matched versus the logger level 1st, then the handler level
> (if applicable). Most of the time you don't need to tune your handler
> levels.

Right. Thanks a lot!!!

Now for the second part, any idea why logging.config.fileConfig doesn't work?

Now the logging.conf looks like this:

[formatters]
keys: detailed

[handlers]
keys: console,file

[loggers]
keys: root

[formatter_detailed]
format: %(name)s:%(levelname)s %(module)s:%(lineno)d:  %(message)s

[handler_console]
class: StreamHandler
args: []
formatter: detailed

[handler_file]
class=FileHandler
formatter=detailed
args=('output.log', 'w')
filename=output.log
mode=w

[logger_root]
level: INFO
handlers: file


From seb.binet at gmail.com  Fri Mar 26 10:29:57 2010
From: seb.binet at gmail.com (Sebastien Binet)
Date: Fri, 26 Mar 2010 07:29:57 -0700 (PDT)
Subject: Revisiting Generators and Subgenerators
References: <bc11ef60-2d6e-46d7-94b4-ed2096834b33@f12g2000prn.googlegroups.com>
Message-ID: <32b967ce-bb76-45ad-8660-c1d96a35fc72@g11g2000yqe.googlegroups.com>

On Mar 25, 10:39?pm, Winston <winst... at stratolab.com> wrote:
> Here's my proposal again, but hopefully with better formatting so you
> can read it easier.
>
> -Winston
> -----------------
>
> Proposal for a new Generator Syntax in Python 3K--
> A Baton object for generators to allow subfunction to yield, and to
> make
> them symetric.

isn't a Baton what CSP calls a channel ?

there is this interesting PyCSP library (which implements channels
over greenlets, os-processes (via multiprocessing) or python threads)
http://code.google.com/p/pycsp

cheers,
sebastien.


From gnarlodious at gmail.com  Fri Mar 26 10:30:47 2010
From: gnarlodious at gmail.com (Gnarlodious)
Date: Fri, 26 Mar 2010 07:30:47 -0700 (PDT)
Subject: Have you embraced Python 3.x yet?
References: <hoicgd$23v0$1@news.telesweet.net>
Message-ID: <ea916e02-ff4a-4251-9569-165a5bfef989@u15g2000prd.googlegroups.com>

I have been using Py3 since October, I switched over for the
OrderedDict feature. Some parts are a little hard to get used to, but
others are easier. I am doing web programming, so the UTF 8 default is
a  big improvement.

-- Gnarlie


From showell30 at yahoo.com  Fri Mar 26 10:31:17 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Fri, 26 Mar 2010 07:31:17 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
Message-ID: <1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>

On Mar 24, 4:19?pm, Paul Rubin <no.em... at nospam.invalid> wrote:
> kj <no.em... at please.post> writes:
> > Is there a sequence-oriented equivalent to the sum built-in? ?E.g.:
> > ? seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)
>
> use itertools.chain for this. ?A few people have mentioned that sum will
> also work, but I think for that purpose it could have O(n**2)
> complexity.

I agree on the practical matter that itertools.chain and other
solutions are usually the way to go for most tasks that involve
iterating through several lists.

>From a purely academic standpoint, I'm not convinced that sum() is
inefficient in terms of big-O complexity, though.

 showell at showell-laptop:~$ python
 Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
 [GCC 4.3.3] on linux2
 >>> class StupidList:
 ...   def __init__(self, lst):
 ...     print 'creating', lst
 ...     self.lst = lst
 ...   def __add__(self, other):
 ...     self.lst += '|'
 ...     self.lst.extend(other.lst)
 ...     return self
 ...
 >>> result = sum([StupidList([1, 2]), StupidList([3,4]),
StupidList([5,6])], StupidList([0]))
 creating [1, 2]
 creating [3, 4]
 creating [5, 6]
 creating [0]
 >>> result.lst
 [0, '|', 1, 2, '|', 3, 4, '|', 5, 6]

If I'm interpreting the above program correctly, then sum() is doing
the most efficient thing under the hood--it appears to do the
equivalent of += without creating unnecessary objects for intermediate
sums.

I think the special-case error message might be a case where
practicality simply beats out purity.  It would be nice if sum() were
completely duck-typed-let-you-shoot-yourself-in-foot-if-you-know-what-
you-are-doing, but maybe this was such a pitfall at one time, that
extra safeguards were put into sum().  I wonder how severely sum(),
without the restriction, would underperform join() on modern versions
of Python, though.

 >>> sum('1', '2')
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
 TypeError: sum() can't sum strings [use ''.join(seq) instead]

Note that you can easily fake out sum() to get duck typing.

 >>> class EmptyStringStarter:
 ...   def __add__(self, other): return other
 ...
 >>> empty = EmptyStringStarter()
 >>> sum(['hello ', 'world'], empty)
 'hello world'



From no.email at please.post  Fri Mar 26 10:49:02 2010
From: no.email at please.post (kj)
Date: Fri, 26 Mar 2010 14:49:02 +0000 (UTC)
Subject: Classes as namespaces?
Message-ID: <hoihgt$p6t$1@reader1.panix.com>



What's the word on using "classes as namespaces"?  E.g.

class _cfg(object):
    spam = 1
    jambon = 3 
    huevos = 2

breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)


Granted, this is not the "intended use" for classes, and therefore
could be viewed as a misuse ("that's what dictionaries are for",
etc.).  But other than this somewhat academic objection[*], I really
can see no problem with using classes in this way.

And yet, I've come across online murky warnings against using
classes as "pseudo-namespaces".  Is there some problem that I'm
not seeing with this technique?

~K

[*] My own subjective dislike for the widespread practice of using
triple quotes to comment out code is formally similar to this one
("the 'intended use' for triple-quoting is not to comment out code",
etc.).  Here I find myself on the opposite side of the purist/pragmatic
divide.  Hmmm.


From showell30 at yahoo.com  Fri Mar 26 10:56:48 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Fri, 26 Mar 2010 07:56:48 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
Message-ID: <fc010d65-838b-436c-b038-8e9c0d8ccc53@h35g2000pri.googlegroups.com>

On Mar 26, 7:31?am, Steve Howell <showel... at yahoo.com> wrote:
> On Mar 24, 4:19?pm, Paul Rubin <no.em... at nospam.invalid> wrote:
>
> > kj <no.em... at please.post> writes:
> > > Is there a sequence-oriented equivalent to the sum built-in? ?E.g.:
> > > ? seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)
>
> > use itertools.chain for this. ?A few people have mentioned that sum will
> > also work, but I think for that purpose it could have O(n**2)
> > complexity.
>
> I agree on the practical matter that itertools.chain and other
> solutions are usually the way to go for most tasks that involve
> iterating through several lists.
>
> From a purely academic standpoint, I'm not convinced that sum() is
> inefficient in terms of big-O complexity, though.
>
> ?showell at showell-laptop:~$ python
> ?Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41)
> ?[GCC 4.3.3] on linux2
> ?>>> class StupidList:
> ?... ? def __init__(self, lst):
> ?... ? ? print 'creating', lst
> ?... ? ? self.lst = lst
> ?... ? def __add__(self, other):
> ?... ? ? self.lst += '|'
> ?... ? ? self.lst.extend(other.lst)
> ?... ? ? return self
> ?...
> ?>>> result = sum([StupidList([1, 2]), StupidList([3,4]),
> StupidList([5,6])], StupidList([0]))
> ?creating [1, 2]
> ?creating [3, 4]
> ?creating [5, 6]
> ?creating [0]
> ?>>> result.lst
> ?[0, '|', 1, 2, '|', 3, 4, '|', 5, 6]
>
> If I'm interpreting the above program correctly, then sum() is doing
> the most efficient thing under the hood--it appears to do the
> equivalent of += without creating unnecessary objects for intermediate
> sums.
>
> I think the special-case error message might be a case where
> practicality simply beats out purity. ?It would be nice if sum() were
> completely duck-typed-let-you-shoot-yourself-in-foot-if-you-know-what-
> you-are-doing, but maybe this was such a pitfall at one time, that
> extra safeguards were put into sum(). ?I wonder how severely sum(),
> without the restriction, would underperform join() on modern versions
> of Python, though.
>
> ?>>> sum('1', '2')
> ?Traceback (most recent call last):
> ? ?File "<stdin>", line 1, in <module>
> ?TypeError: sum() can't sum strings [use ''.join(seq) instead]
>
> Note that you can easily fake out sum() to get duck typing.
>
> ?>>> class EmptyStringStarter:
> ?... ? def __add__(self, other): return other
> ?...
> ?>>> empty = EmptyStringStarter()
> ?>>> sum(['hello ', 'world'], empty)
> ?'hello world'

Looking at the code answers my own questions:

http://svn.python.org/view/python/trunk/Python/bltinmodule.c?view=markup

Look for builtin_sum().

First you see the guard against strings:

 /* reject string values for 'start' parameter */
 if (PyObject_TypeCheck(result, &PyBaseString_Type)) {
	PyErr_SetString(PyExc_TypeError,
		"sum() can't sum strings [use ''.join(seq) instead]");
	Py_DECREF(iter);
	return NULL;
 }
 Py_INCREF(result);


Also, Paul's suspicion that sum() works in O(N squared) for lists is
confirmed by this comment:

  /* It's tempting to use PyNumber_InPlaceAdd instead of
   PyNumber_Add here, to avoid quadratic running time
   when doing 'sum(list_of_lists, [])'.  However, this
   would produce a change in behaviour: a snippet like
     empty = []
     sum([[x] for x in range(10)], empty)
   would change the value of empty. */

It's interesting, though, that you can construct classes pretty
easily, as I did above, that avoid the quadratic behavior, as long as
you do not mind mutating the start value, which I think is usually
fine, since the original start value usually is not useful afterward
anyway.




From robert.kern at gmail.com  Fri Mar 26 10:56:52 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 26 Mar 2010 09:56:52 -0500
Subject: OT: Meaning of "monkey"
In-Reply-To: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
Message-ID: <hoihvp$80i$1@dough.gmane.org>

On 2010-03-26 08:14 AM, Luis M. Gonz?lez wrote:
> Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
> Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
>
> Monkeys everywhere.
> Sorry for the off topic question, but what does "monkey" mean in a
> nerdy-geek context??

Partly because "monkey" is just a funny word.

As for monkey-patching, it came from the Zope community:

   http://en.wikipedia.org/wiki/Monkey_patching

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From joncle at googlemail.com  Fri Mar 26 10:58:52 2010
From: joncle at googlemail.com (Jon Clements)
Date: Fri, 26 Mar 2010 07:58:52 -0700 (PDT)
Subject: Python database of plain text editable by notepad or vi
References: <93d7991f-d688-4692-b34f-2fa571cebbdf@q15g2000yqj.googlegroups.com>
	<46822448-2984-4ef6-85c7-bef834e2e86c@r1g2000yqj.googlegroups.com> 
	<3d897b92-9def-4339-ac19-b06b5fb9705e@e6g2000yqh.googlegroups.com>
Message-ID: <a62686e9-5b8e-4c24-a092-b95554b9536e@30g2000yqi.googlegroups.com>

On 26 Mar, 09:49, James Harris <james.harri... at googlemail.com> wrote:
> On 25 Mar, 22:56, Jon Clements <jon... at googlemail.com> wrote:
>
>
>
> > On 25 Mar, 22:40, James Harris <james.harri... at googlemail.com> wrote:
>
> > > I am looking to store named pieces of text in a form that can be
> > > edited by a standard editor such as notepad (under Windows) or vi
> > > (under Unix) and then pulled into Python as needed. The usual record
> > > locking and transactions of databases are not required.
>
> > > Another way to look at it is to treat the separate files as entries in
> > > a dictionary. The file name would be the key and the lines of the file
> > > the value.
>
> > > Anyone know of a database (with a Python interface) which will allow
> > > text files to be treated as database fields? If not I can just write
> > > it but I thought it best to ask if there was an existing solution
> > > first.
> ...
> > I could be missing something here, but aren't you basically just
> > talking about an OS's filesystem?
>
> For storage, yes. The files would be marked-up text stored in the
> filesystem. The "dbms" (I use the term loosely!) would provide access
> to them by some full or partial key mechanism yet to be determined.
> Read-only access would do - at least for now.
>
> > glob or listdir somewhere, then create a dict using the file contents
> > would meet your criteria, with very little lines of code -- but I
> > would be interested to know what the use-case was for this... Is it
> > read completely at start up time, or if each file contains a large
> > amount of lines and aren't fixed width (or has no other indexing
> > support without maintenance), then is a complete sequential-scan
> > required each time, or do you just tell the user to not update when
> > running (unless I s'pose something along the lines of a SIGHUP for
> > config files is applicable).
>
> All good questions. For now, at least, the files can be read-only and
> I'd want those on disk to be the master copies at all times. If I was
> writing it myself I'd probably 'cache' some files in memory and stat
> them before use. If newer I would reread the file.
>

It's hard to bore this group :)

>
>
> > Sorry, just don't understand why you'd want this.
>
> I tried to avoid boring folks with the details. I'm toying with some
> ideas for a way to help generate source code (in various languages,
> not just Python). If it goes ahead the text files would be mainly
> marked-up code snippets - with or without symbols that need to be
> replaced.
>
> Rather than write one single monolithic app I thought to split it into
> reusable components. One part being data access could perhaps be an
> existing database (and I'll take a look at jkn's suggestion).
>
> Think of the database as similar to an associative array stored on
> disk. The only difference is I may want to play fast and loose with
> the keys in some ways - e.g. check for partial key matches or return a
> list of part-matched keys. The language name could be part of the key
> but I'd also need to store variants for specific language versions.
> I'm not sure yet how it will all pan out. As I say, just throwing
> around some ideas.
>
> James

Thanks for the explanation.

Who admins and, who's editing this data?

I couldn't 100% guarantee that I could modify a text file and always
put the right
delimiter in the right place and remember to escape the relevant chars
(and I'm
probably not the 'average' user).

Any opposition to just putting it in a 'proper' DB, then 'blobbing'
the values?
(or just integrate a procedure/script/function whatever your chosen
RDBMS calls to choose it).
Or in some systems, 'externally referencing'... loads of DB's have
free front-ends,
and there are lots of Python libraries.

I think perhaps, all I'm saying is, I'd choose a different approach.
I'd provide a front-end, rather than choose to re-write the wheel over
DB's.

Be nice to know how you get on, if you'd be so kind?

Cheers,

Jon.




From michel.metzger at gmail.com  Fri Mar 26 11:00:57 2010
From: michel.metzger at gmail.com (Michel)
Date: Fri, 26 Mar 2010 08:00:57 -0700 (PDT)
Subject: Create a class at run-time
References: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>
	<mailman.1196.1269555498.23598.python-list@python.org>
Message-ID: <3479ec6a-fe04-4088-83e9-e3ef60a8152e@k4g2000prh.googlegroups.com>

Well, I don't have the reference to the instance. The class is
actually instantiated later by a the unittest library.

On Mar 25, 6:18?pm, Michiel Overtoom <mot... at xs4all.nl> wrote:
> On 2010-03-25 23:00, Michel wrote:
>
> > I'm trying to dynamically create a class. What I need is to define a
> > class, add methods to it and later instantiate this class. Methods
> > need to be bound to the instance though, and that's my problem.
>
> Maybe this snippet is of any help?
>
> import functools
>
> class Template(object):
> ? ? ?pass
>
> def printmyname(self):
> ? ? ?print self.name
>
> t=Template()
> t.name="Pete"
> t.printmyname=functools.partial(printmyname,t)
>
> u=Template()
> u.name="Mary"
> u.printmyname=functools.partial(printmyname,u)
>
> t.printmyname()
> u.printmyname()
>
> Greetings,
>
> --
> "The ability of the OSS process to collect and harness
> the collective IQ of thousands of individuals across
> the Internet is simply amazing." - Vinod Valloppillilhttp://www.catb.org/~esr/halloween/halloween4.html



From v.harishankar at gmail.com  Fri Mar 26 11:04:13 2010
From: v.harishankar at gmail.com (Harishankar)
Date: Fri, 26 Mar 2010 15:04:13 +0000 (UTC)
Subject: Classes as namespaces?
References: <hoihgt$p6t$1@reader1.panix.com>
Message-ID: <hoiidc$2ao8$1@news.telesweet.net>

On Fri, 26 Mar 2010 14:49:02 +0000, kj wrote:

> What's the word on using "classes as namespaces"?  E.g.
> 
> class _cfg(object):
>     spam = 1
>     jambon = 3
>     huevos = 2
> 
> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
> 
> 
> Granted, this is not the "intended use" for classes, and therefore could
> be viewed as a misuse ("that's what dictionaries are for", etc.).  But
> other than this somewhat academic objection[*], I really can see no
> problem with using classes in this way.
> 
> And yet, I've come across online murky warnings against using classes as
> "pseudo-namespaces".  Is there some problem that I'm not seeing with
> this technique?
> 
> ~K
> 
> [*] My own subjective dislike for the widespread practice of using
> triple quotes to comment out code is formally similar to this one ("the
> 'intended use' for triple-quoting is not to comment out code", etc.). 
> Here I find myself on the opposite side of the purist/pragmatic divide. 
> Hmmm.

I myself am a humble beginner in many ways, but generally isn't that 
(namespacing) achieved by using modules?

I don't find the need generally to assign namespace to local variables 
and when there is a need for it, module level objects do the job.


From philip at semanchuk.com  Fri Mar 26 11:08:35 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Fri, 26 Mar 2010 11:08:35 -0400
Subject: Classes as namespaces?
In-Reply-To: <hoihgt$p6t$1@reader1.panix.com>
References: <hoihgt$p6t$1@reader1.panix.com>
Message-ID: <8651EEFD-64CC-4488-B981-F247C4F75BA6@semanchuk.com>


On Mar 26, 2010, at 10:49 AM, kj wrote:

>
>
> What's the word on using "classes as namespaces"?  E.g.
>
> class _cfg(object):
>    spam = 1
>    jambon = 3
>    huevos = 2
>
> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
>
>
> Granted, this is not the "intended use" for classes, and therefore
> could be viewed as a misuse ("that's what dictionaries are for",
> etc.).  But other than this somewhat academic objection[*], I really
> can see no problem with using classes in this way.
>
> And yet, I've come across online murky warnings against using
> classes as "pseudo-namespaces".  Is there some problem that I'm
> not seeing with this technique?

I hope it's not problematic; I use it all the time.

A few differences about the way I do it:
- I respect PEP 8 for the class name (CamelCaps)
- If the attributes are supposed to be constants, I capitalize the  
attributes
- I often add NONE with a value of zero so that bool(MyClass.NONE)  
will evaluate to False and everything else will be True

Here's an example from my code:

class Apodization(object):
     """ Apodization constants """
     # These constants are arbitrary and may change.
     # However bool(NONE) is guaranteed to be False
     NONE = 0
     GAUSSIAN = 1
     LORENTZIAN = 2



Cheers
Philip



From jeanmichel at sequans.com  Fri Mar 26 11:44:39 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 26 Mar 2010 16:44:39 +0100
Subject: python logging writes an empty file
In-Reply-To: <804cd4021003260729t150ffdd3m1f30fc1bdea138ca@mail.gmail.com>
References: <804cd4021003251711p5c1ec832pf2b98da8f19bef1e@mail.gmail.com>	
	<4BACBC56.1020105@sequans.com>
	<804cd4021003260729t150ffdd3m1f30fc1bdea138ca@mail.gmail.com>
Message-ID: <4BACD667.7020803@sequans.com>

Ovidiu Deac wrote:
>> You set le level of your handler, but did not set the level of the logger
>> itself.
>> Replace file.setLevel(logging.INFO) by
>> logging.getLogger().setLevel(logging.INFO)
>>
>> Log events are matched versus the logger level 1st, then the handler level
>> (if applicable). Most of the time you don't need to tune your handler
>> levels.
>>     
>
> Right. Thanks a lot!!!
>
> Now for the second part, any idea why logging.config.fileConfig doesn't work?
>
> Now the logging.conf looks like this:
>
> [formatters]
> keys: detailed
>
> [handlers]
> keys: console,file
>
> [loggers]
> keys: root
>
> [formatter_detailed]
> format: %(name)s:%(levelname)s %(module)s:%(lineno)d:  %(message)s
>
> [handler_console]
> class: StreamHandler
> args: []
> formatter: detailed
>
> [handler_file]
> class=FileHandler
> formatter=detailed
> args=('output.log', 'w')
> filename=output.log
> mode=w
>
> [logger_root]
> level: INFO
> handlers: file
>   
I'm not sure, I don't use configuration file my loggers.

I don't think the handler_file should have a filename or mode field 
though. Try removing them.

JM


From invalid at invalid.invalid  Fri Mar 26 11:45:18 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Fri, 26 Mar 2010 15:45:18 +0000 (UTC)
Subject: OT: Meaning of "monkey"
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
Message-ID: <hoikqe$qcu$1@reader1.panix.com>

On 2010-03-26, Luis M  Gonz?lez <luismgz at gmail.com> wrote:
> Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
> Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
>
> Monkeys everywhere.
> Sorry for the off topic question, but what does "monkey" mean in a
> nerdy-geek context??

In colloquial English, "<something>-monkey" is a slang term for a
person who does a particular job for a living.  For example "grease
monkey" is a slang term for an auto mechanic.  A "code monkey" is
somebody who writes code for a living.

It can be slightly derogitory in some situations since it implies that
the task is mechanical and repetitive and doesn't require a lot of
creative thinking.

However, it can be used among peers in an affectionate way.  One may
refer to one's peer as "code monkey" without offense, but a manager
could not refer to one of his employees as a "code monkey" without
risking it being seen as an insult.

Many people are accustomed to speaking anthopomorphically about
computers and programs, so when somebody writes a program that does
"foo", the name "foo monkey" seems natural for that program.

-- 
Grant Edwards               grant.b.edwards        Yow! I don't know WHY I
                                  at               said that ... I think it
                              gmail.com            came from the FILLINGS in
                                                   my rear molars ...


From joncle at googlemail.com  Fri Mar 26 11:47:29 2010
From: joncle at googlemail.com (Jon Clements)
Date: Fri, 26 Mar 2010 08:47:29 -0700 (PDT)
Subject: Classes as namespaces?
References: <hoihgt$p6t$1@reader1.panix.com>
Message-ID: <809a6515-214f-4460-a847-0e935c7f87b9@t23g2000yqt.googlegroups.com>

On 26 Mar, 14:49, kj <no.em... at please.post> wrote:
> What's the word on using "classes as namespaces"? ?E.g.
>
> class _cfg(object):
> ? ? spam = 1
> ? ? jambon = 3
> ? ? huevos = 2
>
> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
>
> Granted, this is not the "intended use" for classes, and therefore
> could be viewed as a misuse ("that's what dictionaries are for",
> etc.). ?But other than this somewhat academic objection[*], I really
> can see no problem with using classes in this way.
>
> And yet, I've come across online murky warnings against using
> classes as "pseudo-namespaces". ?Is there some problem that I'm
> not seeing with this technique?
>
> ~K
>
> [*] My own subjective dislike for the widespread practice of using
> triple quotes to comment out code is formally similar to this one
> ("the 'intended use' for triple-quoting is not to comment out code",
> etc.). ?Here I find myself on the opposite side of the purist/pragmatic
> divide. ?Hmmm.

Given this example, I would go for the module and CONSTANT_NAMING
approach.

But yes, even in the docs. you can use a class as a C type-of struct.

I stick to the convention of a class knows what it's doing,
what it's doing it on, and a module just happens to contain those
classes.

C++ std::algorithm for instance,
makes sense it's called std, ditto algorithm and has shed loads in it,
but would I create a class called algorithm (unlikely).

I would tend to view modules as "namespace". Rightly or wrongly, just
lets you make the right design choice.

Jon.





From jackdied at gmail.com  Fri Mar 26 11:49:14 2010
From: jackdied at gmail.com (Jack Diederich)
Date: Fri, 26 Mar 2010 11:49:14 -0400
Subject: Classes as namespaces?
In-Reply-To: <hoihgt$p6t$1@reader1.panix.com>
References: <hoihgt$p6t$1@reader1.panix.com>
Message-ID: <b8e622741003260849m35c3aaa3le3b65e0e4b45d07c@mail.gmail.com>

On Fri, Mar 26, 2010 at 10:49 AM, kj <no.email at please.post> wrote:
>
>
> What's the word on using "classes as namespaces"? ?E.g.
>
> class _cfg(object):
> ? ?spam = 1
> ? ?jambon = 3
> ? ?huevos = 2
>
> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)

Classes as namespaces are a valid use case (I do it all the time).
Python 3 has a small cleanup that makes classes even closer to module
namespaces;  namely the concept of "unbound methods" goes away.  In
3.x when you get a function from a class you get the function itself
and not an unbound function.

-Jack


From jeanmichel at sequans.com  Fri Mar 26 11:50:31 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Fri, 26 Mar 2010 16:50:31 +0100
Subject: Classes as namespaces?
In-Reply-To: <hoihgt$p6t$1@reader1.panix.com>
References: <hoihgt$p6t$1@reader1.panix.com>
Message-ID: <4BACD7C7.1060006@sequans.com>

kj wrote:
> What's the word on using "classes as namespaces"?  E.g.
>
> class _cfg(object):
>     spam = 1
>     jambon = 3 
>     huevos = 2
>
> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
>
>
> Granted, this is not the "intended use" for classes, and therefore
> could be viewed as a misuse ("that's what dictionaries are for",
> etc.).  But other than this somewhat academic objection[*], I really
> can see no problem with using classes in this way.
>   
You cannot see the problem because there's no problem using classes as 
namespaces.
> And yet, I've come across online murky warnings against using
> classes as "pseudo-namespaces".  Is there some problem that I'm
> not seeing with this technique?
>
> ~K
>   
import this
[snip]
Namespaces are one honking great idea -- let's do more of those!

Modules and dictionaries are no more namespaces than classes. So any 
container is potentially a namespace.

JM


From michel.metzger at gmail.com  Fri Mar 26 11:54:11 2010
From: michel.metzger at gmail.com (Michel)
Date: Fri, 26 Mar 2010 08:54:11 -0700 (PDT)
Subject: Create a class at run-time
References: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>
	<4bac1380$1@news.x-privat.org>
Message-ID: <f0fccd34-1abf-4221-9fbb-922082a24f89@t34g2000prm.googlegroups.com>

I want to add a method to a class such that it can be invoked on
specifics instances.
You solution works (as well as Patrick's one), thanks !
I still have a question though. If I print the type of the self object
I get when my method is
called, I get "<class 'test.TestClass'>". I guess this is because the
method is defined as a class method.
This is ok in my case, but just out of curiosity, what should I do to
change this method to an instance method?

Thanks for your help,

Michel.

On Mar 25, 9:53?pm, I V <ivle... at gmail.com> wrote:
> On Thu, 25 Mar 2010 15:00:35 -0700, Michel wrote:
> > I'm trying to dynamically create a class. What I need is to define a
> > class, add methods to it and later instantiate this class. Methods need
> > to be bound to the instance though, and that's my problem. Here is what
> > I have so far:
>
> I'm not entirely sure what you mean by binding methods to the instance.
> Do you mean you need to dynamically add methods to a specific instance?
> Or that you need to add methods to a class, such that they can be invoked
> on specific instances? For the latter, just do:
>
> TestClass.test_foo = test_foo
>
> For the former, try:
>
> tc = TestClass()
> tc.test_foo = types.MethodType(test_foo, tc)



From robert.kern at gmail.com  Fri Mar 26 12:06:19 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Fri, 26 Mar 2010 11:06:19 -0500
Subject: OT: Meaning of "monkey"
In-Reply-To: <hoikqe$qcu$1@reader1.panix.com>
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
	<hoikqe$qcu$1@reader1.panix.com>
Message-ID: <hoim1r$p7u$1@dough.gmane.org>

On 2010-03-26 10:45 AM, Grant Edwards wrote:
> On 2010-03-26, Luis M  Gonz?lez<luismgz at gmail.com>  wrote:
>> Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
>> Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
>>
>> Monkeys everywhere.

> Many people are accustomed to speaking anthopomorphically about

"simiomorphically"?

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From mwilson at the-wire.com  Fri Mar 26 12:08:41 2010
From: mwilson at the-wire.com (Mel)
Date: Fri, 26 Mar 2010 12:08:41 -0400
Subject: OT: Meaning of "monkey"
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
	<hoikqe$qcu$1@reader1.panix.com>
Message-ID: <hoim3t$bol$1@speranza.aioe.org>

Grant Edwards wrote:
> However, it can be used among peers in an affectionate way.  One may
> refer to one's peer as "code monkey" without offense, but a manager
> could not refer to one of his employees as a "code monkey" without
> risking it being seen as an insult.

Somewhere on the Internet there's a particularly brilliant pop song called 
"Code Monkey".

	Mel.




From joncle at googlemail.com  Fri Mar 26 12:14:35 2010
From: joncle at googlemail.com (Jon Clements)
Date: Fri, 26 Mar 2010 09:14:35 -0700 (PDT)
Subject: OT: Meaning of "monkey"
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
	<hoikqe$qcu$1@reader1.panix.com>
Message-ID: <af6b9df5-d5cb-4ce6-8d29-1f304d9c5858@g11g2000yqe.googlegroups.com>

On 26 Mar, 15:45, Grant Edwards <inva... at invalid.invalid> wrote:
> On 2010-03-26, Luis M ?Gonz?lez <luis... at gmail.com> wrote:
>
> > Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
> > Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
>
> > Monkeys everywhere.
> > Sorry for the off topic question, but what does "monkey" mean in a
> > nerdy-geek context??
>
> In colloquial English, "<something>-monkey" is a slang term for a
> person who does a particular job for a living. ?For example "grease
> monkey" is a slang term for an auto mechanic. ?A "code monkey" is
> somebody who writes code for a living.
>
> It can be slightly derogitory in some situations since it implies that
> the task is mechanical and repetitive and doesn't require a lot of
> creative thinking.
>
> However, it can be used among peers in an affectionate way. ?One may
> refer to one's peer as "code monkey" without offense, but a manager
> could not refer to one of his employees as a "code monkey" without
> risking it being seen as an insult.
>
> Many people are accustomed to speaking anthopomorphically about
> computers and programs, so when somebody writes a program that does
> "foo", the name "foo monkey" seems natural for that program.
>
> --
> Grant Edwards ? ? ? ? ? ? ? grant.b.edwards ? ? ? ?Yow! I don't know WHY I
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? at ? ? ? ? ? ? ? said that ... I think it
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? gmail.com ? ? ? ? ? ?came from the FILLINGS in
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?my rear molars ...

Can I take the slight risk that actually it can also be (as you said
'affectionately') in a very positive sense. The same way "geek" or
"nerd" can be applied. I used to be called "Big Geek" from the last
company I worked for on PAYE, but that was a compliment. But, I've
heard my step-dad call someone a "Geek" which is derogatory.

No winning when you have language that can mean "bad" (in meaning
"wicked/very good/awesome" (and even 'wicked' means good sometimes -
as in enthusiasm for an idea)) or actually "bad/not good [add your own
synonyms]". All valid, but which is good/bad :)

Anyway, this' a group for Python, not English :)

Feel better for my rant :)


Jon.





From ovidiudeac at gmail.com  Fri Mar 26 12:26:20 2010
From: ovidiudeac at gmail.com (Ovidiu Deac)
Date: Fri, 26 Mar 2010 18:26:20 +0200
Subject: python logging writes an empty file
In-Reply-To: <4BACD667.7020803@sequans.com>
References: <804cd4021003251711p5c1ec832pf2b98da8f19bef1e@mail.gmail.com>
	<4BACBC56.1020105@sequans.com>
	<804cd4021003260729t150ffdd3m1f30fc1bdea138ca@mail.gmail.com>
	<4BACD667.7020803@sequans.com>
Message-ID: <804cd4021003260926y6610e90flb433737dc9a99e4a@mail.gmail.com>

Anyway, thanks for the first part.

Anybody else has any idea why using the same configuration file works
when running the tests with nosetests and doesn't work with
logging.config.fileConfig() ?


From tim.wintle at teamrubber.com  Fri Mar 26 12:54:30 2010
From: tim.wintle at teamrubber.com (Tim Wintle)
Date: Fri, 26 Mar 2010 16:54:30 +0000
Subject: OT: Meaning of "monkey"
In-Reply-To: <hoim3t$bol$1@speranza.aioe.org>
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
	<hoikqe$qcu$1@reader1.panix.com>  <hoim3t$bol$1@speranza.aioe.org>
Message-ID: <1269622470.29388.1.camel@localhost>

On Fri, 2010-03-26 at 12:08 -0400, Mel wrote:
> Somewhere on the Internet there's a particularly brilliant pop song
> called "Code Monkey".

http://www.jonathancoulton.com/2006/04/14/thing-a-week-29-code-monkey/

(he's linked to the mp3 from there)



From __peter__ at web.de  Fri Mar 26 13:29:23 2010
From: __peter__ at web.de (Peter Otten)
Date: Fri, 26 Mar 2010 18:29:23 +0100
Subject: Create a class at run-time
References: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>
Message-ID: <hoiqsm$gd6$1@dough.gmane.org>

Michel wrote:

> Hi everyone,
> 
> I'm trying to dynamically create a class. What I need is to define a
> class, add methods to it and later instantiate this class. Methods
> need to be bound to the instance though, and that's my problem. Here
> is what I have so far:
> 
> method_template = "def test_foo(self):\
>     #actual test_foo\
>     pass"
> exec method_template
> 
> TestClass = types.ClassType("MyTestClass", (unittest.TestCase, ), {})
> TestClass.__module__ = "test"
> 
> now what to do next?

Just assign it:

>>> import unittest
>>> class MyTestClass(unittest.TestCase): pass
...
>>> def test_foo(self):
...     self.assertEquals(1, 2)
...
>>> MyTestClass.test_foo = test_foo # <----
>>> unittest.main()
F
======================================================================
FAIL: test_foo (__main__.MyTestClass)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "<stdin>", line 2, in test_foo
AssertionError: 1 != 2

----------------------------------------------------------------------
Ran 1 test in 0.000s

FAILED (failures=1)

If you don't know the method name beforehand use

setattr(MyTestClass, method_name, method), e. g:

>>> import unittest
>>> class MyTestClass(unittest.TestCase): pass
...                                           
>>> def make_method(n):
...     def test(self): self.assertEquals(2, n)
...     return test                            
...
>>> for i in range(3):
...     setattr(MyTestClass, "test_%d" % i, make_method(i))
...
>>> unittest.main()
FF.
======================================================================
FAIL: test_0 (__main__.MyTestClass)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "<stdin>", line 2, in test
AssertionError: 2 != 0

======================================================================
FAIL: test_1 (__main__.MyTestClass)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "<stdin>", line 2, in test
AssertionError: 2 != 1

----------------------------------------------------------------------
Ran 3 tests in 0.000s

FAILED (failures=2)

Peter



From sccolbert at gmail.com  Fri Mar 26 13:36:55 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Fri, 26 Mar 2010 13:36:55 -0400
Subject: Classes as namespaces?
In-Reply-To: <4BACD7C7.1060006@sequans.com>
References: <hoihgt$p6t$1@reader1.panix.com> <4BACD7C7.1060006@sequans.com>
Message-ID: <7f014ea61003261036t11f50d89k409b66f854d53ab1@mail.gmail.com>

i use them in Pymazon to encapsulate program wide settings and enforce valid
values for these settings.
http://code.google.com/p/pymazon/source/browse/pymazon/settings.py



On Fri, Mar 26, 2010 at 11:50 AM, Jean-Michel Pichavant <
jeanmichel at sequans.com> wrote:

> kj wrote:
>
>> What's the word on using "classes as namespaces"?  E.g.
>>
>> class _cfg(object):
>>    spam = 1
>>    jambon = 3     huevos = 2
>>
>> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
>>
>>
>> Granted, this is not the "intended use" for classes, and therefore
>> could be viewed as a misuse ("that's what dictionaries are for",
>> etc.).  But other than this somewhat academic objection[*], I really
>> can see no problem with using classes in this way.
>>
>>
> You cannot see the problem because there's no problem using classes as
> namespaces.
>
>  And yet, I've come across online murky warnings against using
>> classes as "pseudo-namespaces".  Is there some problem that I'm
>> not seeing with this technique?
>>
>> ~K
>>
>>
> import this
> [snip]
> Namespaces are one honking great idea -- let's do more of those!
>
> Modules and dictionaries are no more namespaces than classes. So any
> container is potentially a namespace.
>
> JM
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From nobody at nowhere.com  Fri Mar 26 13:38:58 2010
From: nobody at nowhere.com (Nobody)
Date: Fri, 26 Mar 2010 17:38:58 +0000
Subject: Have you embraced Python 3.x yet?
References: <hoicgd$23v0$1@news.telesweet.net>
Message-ID: <pan.2010.03.26.17.38.57.563000@nowhere.com>

On Fri, 26 Mar 2010 13:23:25 +0000, Harishankar wrote:

> Have you people embraced Python 3.x or still with 2.5 or 2.6? 

Still with 2.6, and probably will be indefinitely.

I use Python mostly for Unix scripting: the kind of task which would
traditionally have used Bourne shell. For that purpose, life is much
simpler when everything is byte strings rather than character strings.

If I was doing the same thing on Windows, Python 3.x would probably make
more sense, as all of the OS APIs use Unicode (although there's still a
hell of a lot of software written using the "ANSI" interfaces; my
AppLocale folder has over a hundred entries).



From no.email at please.post  Fri Mar 26 13:51:36 2010
From: no.email at please.post (kj)
Date: Fri, 26 Mar 2010 17:51:36 +0000 (UTC)
Subject: Classes as namespaces?
References: <hoihgt$p6t$1@reader1.panix.com>
	<mailman.1228.1269618641.23598.python-list@python.org>
Message-ID: <hois78$5m6$1@reader1.panix.com>




Thanks for all your comments.

I see that modules are arguably Python's standard way for implementing
namespaces.  I guess I tend to avoid modules primarily because of
lingering mental trauma over incidents of insane/bizarro import
bugs in the past.  (It's not rational, I know; it's like when one
develops an aversion for some previously liked food after a bout
of food poisoning with it.)  Now I postpone creating a new Python
module until the pain of not doing so forces me beyond my phobia.
(Yes, you got that right, I'm a basket case.)


From ownbusiness.ws at gmail.com  Fri Mar 26 14:04:18 2010
From: ownbusiness.ws at gmail.com (www.ownbusiness.ws)
Date: Fri, 26 Mar 2010 11:04:18 -0700 (PDT)
Subject: Income for life !
Message-ID: <eb7e7f17-ee65-4c18-9c85-2f9ab94f0f07@l25g2000yqd.googlegroups.com>

www.ownbusiness.ws

Change your life now.
Try, it really works.


From pavithra445 at gmail.com  Fri Mar 26 14:04:44 2010
From: pavithra445 at gmail.com (PAVITHRA)
Date: Fri, 26 Mar 2010 11:04:44 -0700 (PDT)
Subject: EARN MONEY IN FREE TIME(DO MORE & EARN MORE)
Message-ID: <f2bea4f5-51a3-4885-b77e-8e28e7012fef@m25g2000prj.googlegroups.com>

http://cancerresearch-vijay.blogspot.com/
http://nutritionhealthnoni.blogspot.com/
http://vijay-forestenjoy.blogspot.com/
http://information-041.blogspot.com/
http://onlineworktamilnadu.blogspot.com/
http://vijay-onlinejob.blogspot.com/
http://online-trading111.blogspot.com/
http://hot-problem.blogspot.com/
http://vijay681.blogspot.com/
http://nutuernoni.blogspot.com/
http://nonisearch2008.blogspot.com


From ownbusiness.ws at gmail.com  Fri Mar 26 14:05:12 2010
From: ownbusiness.ws at gmail.com (www.ownbusiness.ws)
Date: Fri, 26 Mar 2010 11:05:12 -0700 (PDT)
Subject: Income for life !
Message-ID: <5bd2ff92-4327-4699-a839-e280e0aa6225@j21g2000yqh.googlegroups.com>

www.ownbusiness.ws

Change your life now.
Try, it really works.


From philip at semanchuk.com  Fri Mar 26 14:10:59 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Fri, 26 Mar 2010 14:10:59 -0400
Subject: Classes as namespaces?
In-Reply-To: <hois78$5m6$1@reader1.panix.com>
References: <hoihgt$p6t$1@reader1.panix.com>
	<mailman.1228.1269618641.23598.python-list@python.org>
	<hois78$5m6$1@reader1.panix.com>
Message-ID: <4CA7EC42-05F4-46F2-A8B2-6BD8FE1CE17A@semanchuk.com>


On Mar 26, 2010, at 1:51 PM, kj wrote:

> Thanks for all your comments.
>
> I see that modules are arguably Python's standard way for implementing
> namespaces.  I guess I tend to avoid modules primarily because of
> lingering mental trauma over incidents of insane/bizarro import
> bugs in the past.

There can be good reasons (i.e. unrelated to trauma) not to use a one- 
namespace-per-module rule.

For instance, The app I'm working on now has 43 classes defined in a  
constants.py file. Each class is just a namespace for constants.  
That's much more practical than 43 modules called foo_constants.py,  
bar_constants.py, etc.

My Currency(type=CurrencyType.USD, value=decimal.Decimal(".02")),
Philip



From luismgz at gmail.com  Fri Mar 26 14:26:04 2010
From: luismgz at gmail.com (=?ISO-8859-1?Q?Luis_M=2E_Gonz=E1lez?=)
Date: Fri, 26 Mar 2010 11:26:04 -0700 (PDT)
Subject: Classes as namespaces?
References: <hoihgt$p6t$1@reader1.panix.com>
Message-ID: <69463be0-d839-43cf-a8a7-1cc9081f672d@r27g2000yqn.googlegroups.com>

On 26 mar, 11:49, kj <no.em... at please.post> wrote:
> What's the word on using "classes as namespaces"? ?E.g.
>
> class _cfg(object):
> ? ? spam = 1
> ? ? jambon = 3
> ? ? huevos = 2
>
> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)

I see no problem.
I wouldn't mix English, French and Spanish in the same recipe though...


From michel.metzger at gmail.com  Fri Mar 26 14:41:21 2010
From: michel.metzger at gmail.com (Michel)
Date: Fri, 26 Mar 2010 11:41:21 -0700 (PDT)
Subject: Create a class at run-time
References: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>
	<mailman.1232.1269624549.23598.python-list@python.org>
Message-ID: <4767a89e-d6a7-4c77-97f8-54d84e3e5bc8@u19g2000prh.googlegroups.com>

Thanks Peter.

I searched a little bit more and wrote the following example:

------------------------------------
import types

class MyClass:

    def test_toto(self):
        print type(self)
        print self.name

def test_toto(self):
    print type(self)
    print self.name

MyDynClass = types.ClassType("MyDynClass", (object, ), {})
MyDynClass.__module__ = "test.complex.hierarchy"
MyDynClass.test_toto = test_toto

t1 = MyDynClass()
t2 = MyDynClass()

t1.name = "Marcel"
t2.name = "Oscar"

t1.test_toto()
t2.test_toto()

c1 = MyClass()
c1.name = "Raoul"
c1.test_toto()
--------------------------------

the output is:

<class 'test.complex.hierarchy.MyDynClass'>
Marcel
<class 'test.complex.hierarchy.MyDynClass'>
Oscar
<type 'instance'>
Raoul

I'm wondering why the type of the self parameter is not 'instance' in
the calls
t1.test_toto() and t2.test_toto()

The rest of the behavior is correct though, so I guess it's just
internal Python stuff.

Thanks for your help,

Michel.

On Mar 26, 1:29?pm, Peter Otten <__pete... at web.de> wrote:
> Michel wrote:
> > Hi everyone,
>
> > I'm trying to dynamically create a class. What I need is to define a
> > class, add methods to it and later instantiate this class. Methods
> > need to be bound to the instance though, and that's my problem. Here
> > is what I have so far:
>
> > method_template = "def test_foo(self):\
> > ? ? #actual test_foo\
> > ? ? pass"
> > exec method_template
>
> > TestClass = types.ClassType("MyTestClass", (unittest.TestCase, ), {})
> > TestClass.__module__ = "test"
>
> > now what to do next?
>
> Just assign it:
>
> >>> import unittest
> >>> class MyTestClass(unittest.TestCase): pass
> ...
> >>> def test_foo(self):
>
> ... ? ? self.assertEquals(1, 2)
> ...>>> MyTestClass.test_foo = test_foo # <----
> >>> unittest.main()
>
> F
> ======================================================================
> FAIL: test_foo (__main__.MyTestClass)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
> ? File "<stdin>", line 2, in test_foo
> AssertionError: 1 != 2
>
> ----------------------------------------------------------------------
> Ran 1 test in 0.000s
>
> FAILED (failures=1)
>
> If you don't know the method name beforehand use
>
> setattr(MyTestClass, method_name, method), e. g:
>
> >>> import unittest
> >>> class MyTestClass(unittest.TestCase): pass
>
> ... ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?>>> def make_method(n):
>
> ... ? ? def test(self): self.assertEquals(2, n)
> ... ? ? return test ? ? ? ? ? ? ? ? ? ? ? ? ? ?
> ...>>> for i in range(3):
>
> ... ? ? setattr(MyTestClass, "test_%d" % i, make_method(i))
> ...>>> unittest.main()
>
> FF.
> ======================================================================
> FAIL: test_0 (__main__.MyTestClass)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
> ? File "<stdin>", line 2, in test
> AssertionError: 2 != 0
>
> ======================================================================
> FAIL: test_1 (__main__.MyTestClass)
> ----------------------------------------------------------------------
> Traceback (most recent call last):
> ? File "<stdin>", line 2, in test
> AssertionError: 2 != 1
>
> ----------------------------------------------------------------------
> Ran 3 tests in 0.000s
>
> FAILED (failures=2)
>
> Peter



From vinay_sajip at yahoo.co.uk  Fri Mar 26 15:09:10 2010
From: vinay_sajip at yahoo.co.uk (Vinay Sajip)
Date: Fri, 26 Mar 2010 12:09:10 -0700 (PDT)
Subject: python logging writes an empty file
References: <804cd4021003251711p5c1ec832pf2b98da8f19bef1e@mail.gmail.com> 
	<4BACBC56.1020105@sequans.com>
	<804cd4021003260729t150ffdd3m1f30fc1bdea138ca@mail.gmail.com> 
	<4BACD667.7020803@sequans.com>
	<mailman.1230.1269620783.23598.python-list@python.org>
Message-ID: <12364311-5d80-4a14-a19b-f1e29aea9735@g19g2000yqe.googlegroups.com>

On Mar 26, 4:26?pm, Ovidiu Deac <ovidiud... at gmail.com> wrote:
> Anyway, thanks for the first part.
>
> Anybody else has any idea why using the same configuration file works
> when running the tests with nosetests and doesn't work withlogging.config.fileConfig() ?

It's probably because the fileConfig code is intended to *replace* any
existing configuration. This means disabling any existing loggers
which are not named explicitly, or not descendants of loggers named
explicitly, in the configuration.

Make sure you call logging.config.fileConfig() before any loggers have
been instantiated in your code, or else ensure that all the top-level
parents of those loggers (i.e. just below the root logger) are defined
in the configuration.

If you have version 2.6 or newer of Python, the fileConfig call has an
optional keyword parameter disable_existing_loggers which has a
default value of True, but which you can set to False to avoid
disabling the existing loggers.

Regards,

Vinay Sajip


From jonas at lophus.org  Fri Mar 26 15:10:24 2010
From: jonas at lophus.org (Jonas H.)
Date: Fri, 26 Mar 2010 20:10:24 +0100
Subject: [C-API] malloc error in PyDict_New
Message-ID: <4BAD06A0.3080206@lophus.org>

Hi there,

I'm currently diving into Python C programming and I have a problem with 
`PyDict_New`.

My application receives a SIGABRT from malloc every time I execute 
`PyDict_New`. malloc throws the following error:

     malloc.c:3096: sYSMALLOc: Assertion `(old_top == (((mbinptr) 
(((char *) &((av)->bins[((1) - 1) * 2])) [snip]' failed.

gdb gives me the following traceback:

     Program received signal SIGABRT, Aborted.
0x0012d422 in __kernel_vsyscall ()
(gdb) bt full
#0  0x0012d422 in __kernel_vsyscall ()
#5  0x003fef8c in malloc () from /lib/tls/i686/cmov/libc.so.6
#6  0x001b129c in new_arena (nbytes=3221223842) at ../Objects/obmalloc.c:534
         i = <value optimized out>
         numarenas = 16
         arenaobj = 0x0
         excess = 16
#7  PyObject_Malloc (nbytes=3221223842) at ../Objects/obmalloc.c:794
         bp = <value optimized out>
         pool = <value optimized out>
         next = <value optimized out>
         size = 4983326
#8  0x001baef5 in PyString_FromString (str=0x2964bf "<dummy key>") at 
../Objects/stringobject.c:138
         op = 0x0
#9  0x001a9d55 in PyDict_New () at ../Objects/dictobject.c:227
         mp = <value optimized out>
#10 0x08048fc0 in Transaction_new () at bjoern.c:32
         transaction = 0x80503a0
#11 0x08049309 in on_sock_accept (mainloop=0x13a120, 
accept_watcher=0xbffff770, revents=1) at bjoern.c:109
         [snip]
#12 0x00130594 in ev_invoke_pending () from /usr/lib/libev.so.3
#13 0x00135774 in ev_loop () from /usr/lib/libev.so.3
#14 0x080496e0 in main (argcount=1, args=0xbffff864) at bjoern.c:207
         [snip]


I have walked millions of Google pages but I couldn't find any 
explanation what causes the allocation error.  I tried to put the 
`PyDict_New` somewhere else to let it be invoked earlier/later. The only 
effect I got is a "memory corruption" reported by glibc.


Could anybody tell me what exactly I'm doing wrong? It is quite possible 
that I fscked up some pointers or memory ranges as this is my first C 
project.

You can find the whole source at github:
     http://github.com/jonashaag/bjoern

The call to `PyDict_New` is here:
     http://github.com/jonashaag/bjoern/blob/master/bjoern.c#L32


Thanks for your help!

     Jonas


From __peter__ at web.de  Fri Mar 26 15:16:28 2010
From: __peter__ at web.de (Peter Otten)
Date: Fri, 26 Mar 2010 20:16:28 +0100
Subject: Create a class at run-time
References: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>
	<mailman.1232.1269624549.23598.python-list@python.org>
	<4767a89e-d6a7-4c77-97f8-54d84e3e5bc8@u19g2000prh.googlegroups.com>
Message-ID: <hoj15d$df2$00$1@news.t-online.com>

Michel wrote:

> Thanks Peter.
> 
> I searched a little bit more and wrote the following example:
> 
> ------------------------------------
> import types
> 
> class MyClass:
> 
>     def test_toto(self):
>         print type(self)
>         print self.name
> 
> def test_toto(self):
>     print type(self)
>     print self.name
> 
> MyDynClass = types.ClassType("MyDynClass", (object, ), {})
> MyDynClass.__module__ = "test.complex.hierarchy"
> MyDynClass.test_toto = test_toto
> 
> t1 = MyDynClass()
> t2 = MyDynClass()
> 
> t1.name = "Marcel"
> t2.name = "Oscar"
> 
> t1.test_toto()
> t2.test_toto()
> 
> c1 = MyClass()
> c1.name = "Raoul"
> c1.test_toto()
> --------------------------------
> 
> the output is:
> 
> <class 'test.complex.hierarchy.MyDynClass'>
> Marcel
> <class 'test.complex.hierarchy.MyDynClass'>
> Oscar
> <type 'instance'>
> Raoul
> 
> I'm wondering why the type of the self parameter is not 'instance' in
> the calls
> t1.test_toto() and t2.test_toto()
> 
> The rest of the behavior is correct though, so I guess it's just
> internal Python stuff.

In Python 2.x there are "classic" and "newstyle" classes. In practice the 
main differences are that classic classes are more likely to call 
__getattr__() and that only newstyle classes support properties correctly.

By inheriting from object you make MyDynClass a newstyle class:

>>> classic = types.ClassType("A", (), {})
>>> newstyle = types.ClassType("A", (object,), {})

>>> type(classic()), type(classic)
(<type 'instance'>, <type 'classobj'>)

>>> type(newstyle()), type(newstyle)
(<class '__main__.A'>, <type 'type'>)

Classic classes exist for backwards compatibility and because most 
programmers are too lazy to have their classes inherit from object when the 
difference doesn't matter. When you create a class dynamically I recommend 
that you use the type() builtin instead of types.ClassType(). This will 
always create a newstyle class -- even when you don't inherit from object 
explicitly:

>>> type(type("A", (), {}))
<type 'type'>
>>> type("A", (), {}).__bases__
(<type 'object'>,)

Peter



From steve at holdenweb.com  Fri Mar 26 15:19:44 2010
From: steve at holdenweb.com (Steve Holden)
Date: Fri, 26 Mar 2010 15:19:44 -0400
Subject: Create a class at run-time
In-Reply-To: <4767a89e-d6a7-4c77-97f8-54d84e3e5bc8@u19g2000prh.googlegroups.com>
References: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>	<mailman.1232.1269624549.23598.python-list@python.org>
	<4767a89e-d6a7-4c77-97f8-54d84e3e5bc8@u19g2000prh.googlegroups.com>
Message-ID: <hoj1cs$a5f$1@dough.gmane.org>

Michel wrote:
> Thanks Peter.
> 
> I searched a little bit more and wrote the following example:
> 
> ------------------------------------
> import types
> 
> class MyClass:
> 
>     def test_toto(self):
>         print type(self)
>         print self.name
> 
> def test_toto(self):
>     print type(self)
>     print self.name
> 
> MyDynClass = types.ClassType("MyDynClass", (object, ), {})
> MyDynClass.__module__ = "test.complex.hierarchy"
> MyDynClass.test_toto = test_toto
> 
> t1 = MyDynClass()
> t2 = MyDynClass()
> 
> t1.name = "Marcel"
> t2.name = "Oscar"
> 
> t1.test_toto()
> t2.test_toto()
> 
> c1 = MyClass()
> c1.name = "Raoul"
> c1.test_toto()
> --------------------------------
> 
> the output is:
> 
> <class 'test.complex.hierarchy.MyDynClass'>
> Marcel
> <class 'test.complex.hierarchy.MyDynClass'>
> Oscar
> <type 'instance'>
> Raoul
> 
> I'm wondering why the type of the self parameter is not 'instance' in
> the calls
> t1.test_toto() and t2.test_toto()
> 
> The rest of the behavior is correct though, so I guess it's just
> internal Python stuff.
> 
Yes, it's just that MyClass is an old-style class (its type is <type
'classobj'>) whereas MyDynClass is a new-style class (its type is <type
'type'>, because it inherits from object).

It's as though you had written

class MyClass:
   ...

class MyDynClass(object):
   ...

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From stefan_ml at behnel.de  Fri Mar 26 15:41:50 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Fri, 26 Mar 2010 20:41:50 +0100
Subject: [C-API] malloc error in PyDict_New
In-Reply-To: <4BAD06A0.3080206@lophus.org>
References: <4BAD06A0.3080206@lophus.org>
Message-ID: <hoj2lu$f53$1@dough.gmane.org>

Jonas H., 26.03.2010 20:10:
> I'm currently diving into Python C programming and I have a problem with
> `PyDict_New`.
>
> My application receives a SIGABRT from malloc every time I execute
> `PyDict_New`. malloc throws the following error:
>
> malloc.c:3096: sYSMALLOc: Assertion `(old_top == (((mbinptr) (((char *)
> &((av)->bins[((1) - 1) * 2])) [snip]' failed.

In case this code is not called from within Python but from some kind of 
network layer callback (maybe in a thread created by C code?), you will 
have to set up a Python interpreter environment for such a thread first. 
See the PyInterpreterState and PyThreadState functions here:

http://docs.python.org/c-api/init.html

Stefan



From phlip2005 at gmail.com  Fri Mar 26 15:44:04 2010
From: phlip2005 at gmail.com (Phlip)
Date: Fri, 26 Mar 2010 12:44:04 -0700 (PDT)
Subject: OT: Meaning of "monkey"
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
Message-ID: <6eca52f7-0a55-4c96-8144-9face3c88124@15g2000yqi.googlegroups.com>

On Mar 26, 6:14?am, Luis M. Gonz?lez <luis... at gmail.com> wrote:
> Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
> Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
>
> Monkeys everywhere.
> Sorry for the off topic question, but what does "monkey" mean in a
> nerdy-geek context??
>
> Luis

Better at typing than thinking.


From mensanator at aol.com  Fri Mar 26 16:07:34 2010
From: mensanator at aol.com (Mensanator)
Date: Fri, 26 Mar 2010 13:07:34 -0700 (PDT)
Subject: Have you embraced Python 3.x yet?
References: <hoicgd$23v0$1@news.telesweet.net>
Message-ID: <195c7315-85cc-412d-8ef5-f13314aecaae@33g2000yqj.googlegroups.com>

On Mar 26, 8:23?am, Harishankar <v.harishan... at gmail.com> wrote:
> Have you people embraced Python 3.x or still with 2.5 or 2.6?

3.1.

The only module I use regularly is gmpy and that's one that has
been updated.


From ovidiudeac at gmail.com  Fri Mar 26 16:08:14 2010
From: ovidiudeac at gmail.com (Ovidiu Deac)
Date: Fri, 26 Mar 2010 22:08:14 +0200
Subject: python logging writes an empty file
In-Reply-To: <12364311-5d80-4a14-a19b-f1e29aea9735@g19g2000yqe.googlegroups.com>
References: <804cd4021003251711p5c1ec832pf2b98da8f19bef1e@mail.gmail.com>
	<4BACBC56.1020105@sequans.com>
	<804cd4021003260729t150ffdd3m1f30fc1bdea138ca@mail.gmail.com>
	<4BACD667.7020803@sequans.com>
	<mailman.1230.1269620783.23598.python-list@python.org>
	<12364311-5d80-4a14-a19b-f1e29aea9735@g19g2000yqe.googlegroups.com>
Message-ID: <804cd4021003261308m5c5fc88cp35e0d1c43909aeb2@mail.gmail.com>

It worked. Setting disable_existing_loggers=False fixed my problem.

Thanks to both of you!
Ovidiu

On Fri, Mar 26, 2010 at 9:09 PM, Vinay Sajip <vinay_sajip at yahoo.co.uk> wrote:
> On Mar 26, 4:26?pm, Ovidiu Deac <ovidiud... at gmail.com> wrote:
>> Anyway, thanks for the first part.
>>
>> Anybody else has any idea why using the same configuration file works
>> when running the tests with nosetests and doesn't work withlogging.config.fileConfig() ?
>
> It's probably because the fileConfig code is intended to *replace* any
> existing configuration. This means disabling any existing loggers
> which are not named explicitly, or not descendants of loggers named
> explicitly, in the configuration.
>
> Make sure you call logging.config.fileConfig() before any loggers have
> been instantiated in your code, or else ensure that all the top-level
> parents of those loggers (i.e. just below the root logger) are defined
> in the configuration.
>
> If you have version 2.6 or newer of Python, the fileConfig call has an
> optional keyword parameter disable_existing_loggers which has a
> default value of True, but which you can set to False to avoid
> disabling the existing loggers.
>
> Regards,
>
> Vinay Sajip
> --
> http://mail.python.org/mailman/listinfo/python-list
>


From mensanator at aol.com  Fri Mar 26 16:18:47 2010
From: mensanator at aol.com (Mensanator)
Date: Fri, 26 Mar 2010 13:18:47 -0700 (PDT)
Subject: OT: Meaning of "monkey"
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
	<6eca52f7-0a55-4c96-8144-9face3c88124@15g2000yqi.googlegroups.com>
Message-ID: <e684e6ae-be88-4d2b-8447-733f3a10d882@z11g2000yqz.googlegroups.com>

On Mar 26, 2:44?pm, Phlip <phlip2... at gmail.com> wrote:
> On Mar 26, 6:14?am, Luis M. Gonz?lez <luis... at gmail.com> wrote:
>
> > Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
> > Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
>
> > Monkeys everywhere.
> > Sorry for the off topic question, but what does "monkey" mean in a
> > nerdy-geek context??
>
> > Luis
>
> Better at typing than thinking.

Really? I thought it was more of a reference to Eddington, i.e., given
enough time even a monkey can type out a program.


From sccolbert at gmail.com  Fri Mar 26 16:26:44 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Fri, 26 Mar 2010 16:26:44 -0400
Subject: Have you embraced Python 3.x yet?
In-Reply-To: <195c7315-85cc-412d-8ef5-f13314aecaae@33g2000yqj.googlegroups.com>
References: <hoicgd$23v0$1@news.telesweet.net>
	<195c7315-85cc-412d-8ef5-f13314aecaae@33g2000yqj.googlegroups.com>
Message-ID: <7f014ea61003261326g3be655d8oefc1f710a6f7ae91@mail.gmail.com>

On Fri, Mar 26, 2010 at 4:07 PM, Mensanator <mensanator at aol.com> wrote:

> On Mar 26, 8:23 am, Harishankar <v.harishan... at gmail.com> wrote:
> > Have you people embraced Python 3.x or still with 2.5 or 2.6?
>
> 3.1.
>
> The only module I use regularly is gmpy and that's one that has
> been updated.
> --
> http://mail.python.org/mailman/listinfo/python-list
>

I won't switch until NumPy and SciPy make the jump.
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From ivlenin at gmail.com  Fri Mar 26 16:46:04 2010
From: ivlenin at gmail.com (I V)
Date: 26 Mar 2010 21:46:04 +0100
Subject: Create a class at run-time
References: <0b161d98-64b2-488f-b62e-19062bad23c8@f14g2000pre.googlegroups.com>
	<4bac1380$1@news.x-privat.org>
	<f0fccd34-1abf-4221-9fbb-922082a24f89@t34g2000prm.googlegroups.com>
Message-ID: <4bad1d0c$1@news.x-privat.org>

On Fri, 26 Mar 2010 08:54:11 -0700, Michel wrote:

> I want to add a method to a class such that it can be invoked on
> specifics instances.
> You solution works (as well as Patrick's one), thanks ! I still have a
> question though. If I print the type of the self object I get when my
> method is
> called, I get "<class 'test.TestClass'>". I guess this is because the
> method is defined as a class method.
> This is ok in my case, but just out of curiosity, what should I do to
> change this method to an instance method?

It already is an instance method. When you create a TestClass instance, 
the type of that instance is TestClass (the type of TestClass itself is 
"type").


From ricaraoz at gmail.com  Fri Mar 26 16:51:23 2010
From: ricaraoz at gmail.com (=?ISO-8859-1?Q?Ricardo_Ar=E1oz?=)
Date: Fri, 26 Mar 2010 17:51:23 -0300
Subject: Classes as namespaces?
In-Reply-To: <69463be0-d839-43cf-a8a7-1cc9081f672d@r27g2000yqn.googlegroups.com>
References: <hoihgt$p6t$1@reader1.panix.com>
	<69463be0-d839-43cf-a8a7-1cc9081f672d@r27g2000yqn.googlegroups.com>
Message-ID: <4BAD1E4B.5000000@gmail.com>

Luis M. Gonz?lez wrote:
> On 26 mar, 11:49, kj <no.em... at please.post> wrote:
>   
>> What's the word on using "classes as namespaces"?  E.g.
>>
>> class _cfg(object):
>>     spam = 1
>>     jambon = 3
>>     huevos = 2
>>
>> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
>>     
>
> I see no problem.
> I wouldn't mix English, French and Spanish in the same recipe though...
>   
Why? Do you think it might get over cooked? ;c)

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From winstonwolff at gmail.com  Fri Mar 26 17:34:42 2010
From: winstonwolff at gmail.com (Winston)
Date: Fri, 26 Mar 2010 14:34:42 -0700 (PDT)
Subject: Revisiting Generators and Subgenerators
References: <bc11ef60-2d6e-46d7-94b4-ed2096834b33@f12g2000prn.googlegroups.com>
	<32b967ce-bb76-45ad-8660-c1d96a35fc72@g11g2000yqe.googlegroups.com>
Message-ID: <c9c3b6ae-a43e-4400-9fbe-00f9a42fa336@w39g2000prd.googlegroups.com>

On Mar 26, 7:29?am, Sebastien Binet <seb.bi... at gmail.com> wrote:
> > Proposal for a new Generator Syntax in Python 3K--
> > A Baton object for generators to allow subfunction to yield, and to
> > make
> > them symetric.
>
> isn't a Baton what CSP calls a channel ?
>
> there is this interesting PyCSP library (which implements channels
> over greenlets, os-processes (via multiprocessing) or python threads)http://code.google.com/p/pycsp
>
> cheers,
> sebastien.

Thanks for the link. After reading about Greenlets, it seems my Baton
is a Greenlet. It is not passed in to the new greenlet as I wrote
above, but both sides use it to pass execution to the other, and to
send a value on switching.

I'm glad my thinking is matching other people's thinking. Now I have
to search for a greenlet written for Jython.

And thanks to others for their thoughts on this subject.

-Winston


From novacompute at gmail.com  Fri Mar 26 17:58:08 2010
From: novacompute at gmail.com (wukong)
Date: Fri, 26 Mar 2010 14:58:08 -0700 (PDT)
Subject: exec .exe
Message-ID: <f6859e00-5f36-488d-bcc2-1f6c36a69846@a10g2000pri.googlegroups.com>

newbie question, how do you run a .exe generated by MSVC++ in python
in windows?


From ldo at geek-central.gen.new_zealand  Fri Mar 26 18:05:34 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sat, 27 Mar 2010 11:05:34 +1300
Subject: sqlite version on windows
References: <4BAC8521.2@shopzeus.com>
	<mailman.1215.1269608278.23598.python-list@python.org>
Message-ID: <hojb3e$ujp$3@lust.ihug.co.nz>

In message <mailman.1215.1269608278.23598.python-list at python.org>, Philip 
Semanchuk wrote:

> On Mar 26, 2010, at 5:57 AM, Laszlo Nagy wrote:
>>
>> On my Linux system: Python version: 2.6.2 sqlite3.sqlite_version:
>> 3.6.10
>> On my Windows system: Python version: 2.6.5 sqlite3.sqlite_version:
>> 3.5.9
>>
>> Why is that?
> 
> The few Linux distros that I checked are much more aggressive about
> bundling newer versions of SQLite. For instance, Ubuntu 8.04 has
> Python 2.5.2 with SQLite 3.4.2, while Ubuntu 8.10 has the same version
> of Python but offers SQLite 3.5.9.
> 
> You asked "why" and I don't know. I imagine it comes down to
> philosophical differences or maybe just a lack of time to test when
> building new WIndows distros for Python.org.

Maybe the issues are more practical than philosophical. Linux distros use an 
integrated package manager and are maintained by a cohesive community. What 
that means is that the SQLite package isn?t just used by Python, but by a 
bunch of other stuff as well. So all the maintainers of those packages have 
an interest in making sure that SQLite doesn?t break them.

Whereas on Windows, the Python download has to include _all_ its 
dependencies, it cannot rely on a system-integrated package manager to 
automatically provide them. And the same is true for every other open-source 
package that anyone tries to pre-build for Windows. So they all have to 
provide their own installation routines, their own updates, their own 
testing ... in short, a lot of duplication of effort. This is expensive.


From emile at fenx.com  Fri Mar 26 18:09:24 2010
From: emile at fenx.com (Emile van Sebille)
Date: Fri, 26 Mar 2010 15:09:24 -0700
Subject: OT: Meaning of "monkey"
In-Reply-To: <e684e6ae-be88-4d2b-8447-733f3a10d882@z11g2000yqz.googlegroups.com>
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>	<6eca52f7-0a55-4c96-8144-9face3c88124@15g2000yqi.googlegroups.com>
	<e684e6ae-be88-4d2b-8447-733f3a10d882@z11g2000yqz.googlegroups.com>
Message-ID: <hojbec$hi5$1@dough.gmane.org>

On 3/26/2010 1:18 PM Mensanator said...
> On Mar 26, 2:44 pm, Phlip<phlip2... at gmail.com>  wrote:
>> On Mar 26, 6:14 am, Luis M. Gonz?lez<luis... at gmail.com>  wrote:
>>
>>> Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
>>> Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
>>
>>> Monkeys everywhere.
>>> Sorry for the off topic question, but what does "monkey" mean in a
>>> nerdy-geek context??
>>
>>> Luis
>>
>> Better at typing than thinking.
>
> Really? I thought it was more of a reference to Eddington, i.e., given
> enough time even a monkey can type out a program.

I like the quote that went along the lines of 'here we are, and no we 
haven't'





From irmen-NOSPAM- at xs4all.nl  Fri Mar 26 18:10:38 2010
From: irmen-NOSPAM- at xs4all.nl (Irmen de Jong)
Date: Fri, 26 Mar 2010 23:10:38 +0100
Subject: exec .exe
In-Reply-To: <f6859e00-5f36-488d-bcc2-1f6c36a69846@a10g2000pri.googlegroups.com>
References: <f6859e00-5f36-488d-bcc2-1f6c36a69846@a10g2000pri.googlegroups.com>
Message-ID: <4bad3060$0$22937$e4fe514c@news.xs4all.nl>

On 26-3-2010 22:58, wukong wrote:
> newbie question, how do you run a .exe generated by MSVC++ in python
> in windows?

Use the subprocess module, for instance:
subprocess.call(["notepad.exe", "d:/file.txt"])

irmen


From cs at zip.com.au  Fri Mar 26 18:28:28 2010
From: cs at zip.com.au (Cameron Simpson)
Date: Sat, 27 Mar 2010 09:28:28 +1100
Subject: Revisiting Generators and Subgenerators
In-Reply-To: <32b967ce-bb76-45ad-8660-c1d96a35fc72@g11g2000yqe.googlegroups.com>
References: <32b967ce-bb76-45ad-8660-c1d96a35fc72@g11g2000yqe.googlegroups.com>
Message-ID: <20100326222828.GA15135@cskk.homeip.net>

On 26Mar2010 07:29, Sebastien Binet <seb.binet at gmail.com> wrote:
| On Mar 25, 10:39?pm, Winston <winst... at stratolab.com> wrote:
| > A Baton object for generators to allow subfunction to yield, and to
| > make them symetric.
| 
| isn't a Baton what CSP calls a channel ?

I was thinking about this (roughly) in the shower this morning before
seeing this message.

One difference is that a Channel or zero-storage Queue lets the putter
continue execution after the put (or at least the other side's get). A
co-routine won't proceed until later, no? So a co-routine setup will do
lazier computation than a similar threaded setup.

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

Principles have no real force except when one is well fed.      - Mark Twain


From novacompute at gmail.com  Fri Mar 26 18:48:02 2010
From: novacompute at gmail.com (wukong)
Date: Fri, 26 Mar 2010 15:48:02 -0700 (PDT)
Subject: exec .exe
References: <f6859e00-5f36-488d-bcc2-1f6c36a69846@a10g2000pri.googlegroups.com>
	<4bad3060$0$22937$e4fe514c@news.xs4all.nl>
Message-ID: <8524a2ad-1f16-45b1-9c56-6f8b5b7e1413@l12g2000pra.googlegroups.com>

On Mar 26, 3:10?pm, Irmen de Jong <irmen-NOSP... at xs4all.nl> wrote:
> On 26-3-2010 22:58, wukong wrote:
>
> > newbie question, how do you run a .exe generated by MSVC++ in python
> > in windows?
>
> Use the subprocess module, for instance:
> subprocess.call(["notepad.exe", "d:/file.txt"])
>
> irmen

worked like a charm, :-)  thanks irmen.


From tjreedy at udel.edu  Fri Mar 26 19:43:18 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Fri, 26 Mar 2010 19:43:18 -0400
Subject: Have you embraced Python 3.x yet?
In-Reply-To: <hoicgd$23v0$1@news.telesweet.net>
References: <hoicgd$23v0$1@news.telesweet.net>
Message-ID: <hojgqk$uuc$1@dough.gmane.org>

On 3/26/2010 9:23 AM, Harishankar wrote:
> Have you people embraced Python 3.x?

Yes. My current work only needs the stdlib and I much prefer the 
streamlined language.



From steve at REMOVE-THIS-cybersource.com.au  Fri Mar 26 20:03:30 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 27 Mar 2010 00:03:30 GMT
Subject: Classes as namespaces?
References: <hoihgt$p6t$1@reader1.panix.com>
Message-ID: <4bad4b52$0$27866$c3e8da3@news.astraweb.com>

On Fri, 26 Mar 2010 14:49:02 +0000, kj wrote:

> What's the word on using "classes as namespaces"? 


>>> import this
[...]
Namespaces are one honking great idea -- let's do more of those!




> [*] My own subjective dislike for the widespread practice of using
> triple quotes to comment out code is formally similar to this one ("the
> 'intended use' for triple-quoting is not to comment out code", etc.). 

On the contrary. CPython deliberately strips bare strings (whether triple 
quoted or not) out during compilation. This isn't an accident, it is 
deliberate.


>>> code = """
... x = 1
... y = 2
... # comment
... "a string"
... z = 4
... """
>>> o = compile(code, '', 'exec')
>>> dis.dis(o)
  2           0 LOAD_CONST               0 (1)
              3 STORE_NAME               0 (x)

  3           6 LOAD_CONST               1 (2)
              9 STORE_NAME               1 (y)

  6          12 LOAD_CONST               2 (4)
             15 STORE_NAME               2 (z)
             18 LOAD_CONST               3 (None)
             21 RETURN_VALUE


Why should you not do this? First, it is implementation-specific: other 
Pythons may not behave the same. Potentially they may compile in the 
(potentially large) string, push it on the stack, then immediately pop it 
off again. Older versions of CPython used to do that for non-strings.


Secondly, and FAR more importantly, leaving large amounts of commented 
out code in your source is a TERRIBLE idea. Yes, sure, it's tempting to 
do, especially for quick and dirty scripts. Resist the temptation. Learn 
how to use a proper code repository. Don't leave the detritus of ancient 
unused code in your source files -- it confuses the reader, makes 
searching harder, slows down parsing, and (trust me) you will never need 
to read the old code again. It just gets in the way.

Of course, like everything, this needs to be considered in context. You 
might leave commented-out code like this:

# DON'T DO THIS:
# s = spam(s, s*2)
# It doesn't work. See bug #12345 in the tracker. Instead do this:
s = spam(s*2, s)



-- 
Steven


From debatem1 at gmail.com  Fri Mar 26 20:33:12 2010
From: debatem1 at gmail.com (geremy condra)
Date: Fri, 26 Mar 2010 20:33:12 -0400
Subject: Have you embraced Python 3.x yet?
In-Reply-To: <hoicgd$23v0$1@news.telesweet.net>
References: <hoicgd$23v0$1@news.telesweet.net>
Message-ID: <f3cc57c61003261733k79f996e1w8a02b580e930b65d@mail.gmail.com>

On Fri, Mar 26, 2010 at 9:23 AM, Harishankar <v.harishankar at gmail.com> wrote:
> Have you people embraced Python 3.x or still with 2.5 or 2.6?
>
> I personally want to switch over but not too sure how many people are
> using 3.x as opposed to 2 so I want to keep my programs compatible for
> the majority.
>
> -- Hari
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Yes- I write new code in 3.x and backport it PRN.

Geremy Condra


From ethan at stoneleaf.us  Fri Mar 26 20:59:21 2010
From: ethan at stoneleaf.us (Ethan Furman)
Date: Fri, 26 Mar 2010 17:59:21 -0700
Subject: Python database of plain text editable by notepad or vi
In-Reply-To: <a62686e9-5b8e-4c24-a092-b95554b9536e@30g2000yqi.googlegroups.com>
References: <93d7991f-d688-4692-b34f-2fa571cebbdf@q15g2000yqj.googlegroups.com>	<46822448-2984-4ef6-85c7-bef834e2e86c@r1g2000yqj.googlegroups.com>
	<3d897b92-9def-4339-ac19-b06b5fb9705e@e6g2000yqh.googlegroups.com>
	<a62686e9-5b8e-4c24-a092-b95554b9536e@30g2000yqi.googlegroups.com>
Message-ID: <4BAD5869.1010107@stoneleaf.us>

Jon Clements wrote:
> On 26 Mar, 09:49, James Harris <james.harri... at googlemail.com> wrote:
> 
>>On 25 Mar, 22:56, Jon Clements <jon... at googlemail.com> wrote:
>>
>>
>>
>>
>>>On 25 Mar, 22:40, James Harris <james.harri... at googlemail.com> wrote:
>>
>>>>I am looking to store named pieces of text in a form that can be
>>>>edited by a standard editor such as notepad (under Windows) or vi
>>>>(under Unix) and then pulled into Python as needed. The usual record
>>>>locking and transactions of databases are not required.
>>
>>>>Another way to look at it is to treat the separate files as entries in
>>>>a dictionary. The file name would be the key and the lines of the file
>>>>the value.
>>
>>>>Anyone know of a database (with a Python interface) which will allow
>>>>text files to be treated as database fields? If not I can just write
>>>>it but I thought it best to ask if there was an existing solution
>>>>first.
>>
>>...
>>
>>>I could be missing something here, but aren't you basically just
>>>talking about an OS's filesystem?
>>
>>For storage, yes. The files would be marked-up text stored in the
>>filesystem. The "dbms" (I use the term loosely!) would provide access
>>to them by some full or partial key mechanism yet to be determined.
>>Read-only access would do - at least for now.
>>
>>
>>>glob or listdir somewhere, then create a dict using the file contents
>>>would meet your criteria, with very little lines of code -- but I
>>>would be interested to know what the use-case was for this... Is it
>>>read completely at start up time, or if each file contains a large
>>>amount of lines and aren't fixed width (or has no other indexing
>>>support without maintenance), then is a complete sequential-scan
>>>required each time, or do you just tell the user to not update when
>>>running (unless I s'pose something along the lines of a SIGHUP for
>>>config files is applicable).
>>
>>All good questions. For now, at least, the files can be read-only and
>>I'd want those on disk to be the master copies at all times. If I was
>>writing it myself I'd probably 'cache' some files in memory and stat
>>them before use. If newer I would reread the file.
>>
> 
> 
> It's hard to bore this group :)
> 
> 
>>
>>>Sorry, just don't understand why you'd want this.
>>
>>I tried to avoid boring folks with the details. I'm toying with some
>>ideas for a way to help generate source code (in various languages,
>>not just Python). If it goes ahead the text files would be mainly
>>marked-up code snippets - with or without symbols that need to be
>>replaced.
>>
>>Rather than write one single monolithic app I thought to split it into
>>reusable components. One part being data access could perhaps be an
>>existing database (and I'll take a look at jkn's suggestion).
>>
>>Think of the database as similar to an associative array stored on
>>disk. The only difference is I may want to play fast and loose with
>>the keys in some ways - e.g. check for partial key matches or return a
>>list of part-matched keys. The language name could be part of the key
>>but I'd also need to store variants for specific language versions.
>>I'm not sure yet how it will all pan out. As I say, just throwing
>>around some ideas.
>>
>>James
> 
> 
> Thanks for the explanation.
> 
> Who admins and, who's editing this data?
> 
> I couldn't 100% guarantee that I could modify a text file and always
> put the right
> delimiter in the right place and remember to escape the relevant chars
> (and I'm
> probably not the 'average' user).
> 
> Any opposition to just putting it in a 'proper' DB, then 'blobbing'
> the values?
> (or just integrate a procedure/script/function whatever your chosen
> RDBMS calls to choose it).
> Or in some systems, 'externally referencing'... loads of DB's have
> free front-ends,
> and there are lots of Python libraries.
> 
> I think perhaps, all I'm saying is, I'd choose a different approach.
> I'd provide a front-end, rather than choose to re-write the wheel over
> DB's.

Just to provide a counter-viewpoint:

The (one) system I have worked with that was like that (program source 
files kept in blobs in a database) I absolutely hated.  I was stuck with 
using  the tools provided by the app (which, amazingly enough, I also 
hated ;), and unable to use my own tools because because *my* source 
files were _not_ saved as *files*.  Okay, venting over.

My point is, if what you are storing is plain ol' source files, 
providing a way to directly access them is a good thing.  If what you 
are storing is a mangled version, the ability to let the user choose any 
editor to use is a good thing.  :)

My $0.02.

~Ethan~


From nocbos at gmail.com  Fri Mar 26 21:18:07 2010
From: nocbos at gmail.com (C. B.)
Date: Fri, 26 Mar 2010 18:18:07 -0700 (PDT)
Subject: Automatic import ?
References: <4d167b6b-04fb-42bb-9c21-ab66d0fb4367@k17g2000yqb.googlegroups.com>
	<mailman.1214.1269606975.23598.python-list@python.org>
Message-ID: <f4f7a234-e1c4-4f5c-8b0b-a089cafa7607@h18g2000yqo.googlegroups.com>

At first, thank you all for your answers.

Some more details about what I'm coding and what I need...

The classes AAA and BBB are just given as examples. In fact, BBB's
constructor accepts several parameters, meaning it can be different
for each creation of AAA. So it can't be simply skipped from the AAA's
one, even if there can be a default value.

Making AAA do the call to BBB is a solution, but, in that case, the
end-user loses the reference to the used BBB instance.

Concerning the reason why I wish to avoid importing, once again AAA
and BBB were just examples. I plan to add more classes, so AAA will
also need CCC, DDD, and so on to work.

It takes time to write the relative importations, that's ok, but I
think it could be more pleasant for the end-user to not have to write
a huge list of "from mymodule import xxx" if it is possible to take
advantage of automatic importations.

Cheers,


From apt.shansen at gmail.invalid  Fri Mar 26 21:45:54 2010
From: apt.shansen at gmail.invalid (Stephen Hansen)
Date: Fri, 26 Mar 2010 18:45:54 -0700
Subject: GIF89A and PIL
Message-ID: <2010032618455468300-aptshansen@gmailinvalid>

Hi, all.

Is it possible to get PIL to save GIF's in GIF89A format, instead of 
GIF87A? If not, are there any decent other image libraries out there 
that anyone's familiar with? The only one I could find was 
PythonMagick, which seems completely undocumented. Or I'm blind.

Ahem.

But the problem is, I have a nice, small little 72 byte GIF89A file, 
that I want to do some slight tweaking on and then re-save. I noticed 
that even if I completely skipped the tweaking step and -just- saved, 
it exploded into a 919 byte GIF87A file. And in this context, bytes 
really, really matter. I picked GIF over PNG because the same file in 
PNG was 120 bytes :)

I'm not an expert on graphics, so I don't actually know for certain if 
its the fact that PIL is saving in GIF87A format that's causing the 
size to explode, it might just be that PIL is doing.. Something Weird 
when it saves it as a GIF, too.

To demonstrate:

>>> f = open('../tiles/BaseTemplate.gif', 'rb')
>>> d1 = f.read()
>>> len(d1)
73
>>> d1
'GIF89a\x10\x00\x10\x00\x80\x00\x00\xff\xff\xff\x00\x00\x00!\xf9\x04\x00\x00\x00\x00\x00,\x00\x00\x00\x00\x10\x00\x10\x00\x00\x02 
\x8c\x8fi\xc0\xed\xbe\x9edq\xbej\x1b\xce`go\x81\x93(\x91W\xc0AhJ\xad\xac\xa9*\xb2Q\x00\x00;'
>>> 

im = Image.open('../tiles/BaseTemplate.gif')
>>> import cStringIO
>>> cfp = cStringIO.StringIO()
>>> im.save(cfp, format="gif")
>>> cfp.seek(0)
>>> d2 = cfp.read()
>>> d2
'GIF87a\x10[...snip...]\x00;'
>>> len(d2)
919

-- 
--S

... p.s: change the ".invalid" to ".com" in email address to reply privately.



From steve at REMOVE-THIS-cybersource.com.au  Fri Mar 26 22:00:24 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 27 Mar 2010 02:00:24 GMT
Subject: Automatic import ?
References: <4d167b6b-04fb-42bb-9c21-ab66d0fb4367@k17g2000yqb.googlegroups.com>
	<mailman.1214.1269606975.23598.python-list@python.org>
	<f4f7a234-e1c4-4f5c-8b0b-a089cafa7607@h18g2000yqo.googlegroups.com>
Message-ID: <4bad66b8$0$27866$c3e8da3@news.astraweb.com>

On Fri, 26 Mar 2010 18:18:07 -0700, C. B. wrote:

> It takes time to write the relative importations, that's ok, but I think
> it could be more pleasant for the end-user to not have to write a huge
> list of "from mymodule import xxx" if it is possible to take advantage
> of automatic importations.

You mean by black magic? Something like this?


>>> GGG = "My really important value"
>>> from mymodule import AAA
>>> print AAA()
"something"
>>> print GGG
<class 'mymodule.GGG'>
>>> print "WTF happened to my important value???"
'magic ate it'


As a general rule, Python does not allow magic. One exception is:

from mymodule import *


however once you have been bitten by it, you will soon learn to avoid it 
as almost always a bad idea.



-- 
Steven


From timr at probo.com  Fri Mar 26 23:15:27 2010
From: timr at probo.com (Tim Roberts)
Date: Fri, 26 Mar 2010 20:15:27 -0700
Subject: Advice Criticism on Python App
References: <de18cb49-b0fd-4862-b9af-3743720e0db6@u19g2000prh.googlegroups.com>
	<uholq5peen08i78f968juvhskpedhhnlr3@4ax.com>
	<pan.2010.03.25.05.10.05@REMOVE.THIS.cybersource.com.au>
Message-ID: <rutqq5hi7188avjt6cc2t0bff3et03gg23@4ax.com>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> wrote:

>On Wed, 24 Mar 2010 21:14:23 -0700, Tim Roberts wrote:
>
>> Jimbo <nilly16 at yahoo.com> wrote:
>>>
>>>class stock:
>>>    code             = ""
>>>    purchasePrice    = 0
>>>    purchaseQuantity = 0
>>>    price            = []  # list of recent prices 
>>>    recentBid        = []  # list of recent bids for stock
>>>    recentOffer      = []  # list of recent offers for stock
>>>    stockVol         = []  # list of stock quantity available on market
>> 
>> Using lists as class variables is a very good way to create very
>> surprising bugs.  Consider the following:
>
>Don't you think that the class attributes are *supposed* to be shared by 
>all instances? In that case the behaviour you show is not a bug at all.

Yes, it occurred to me just after I sent that pot that I had answered a
different question from the one he asked.  I SUSPECT that he is using class
variables as a way to initialize members, not as true class variables.

Thanks for clarifying this.
-- 
Tim Roberts, timr at probo.com
Providenza & Boekelheide, Inc.


From python at mrabarnett.plus.com  Fri Mar 26 23:50:00 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Sat, 27 Mar 2010 03:50:00 +0000
Subject: Automatic import ?
In-Reply-To: <f4f7a234-e1c4-4f5c-8b0b-a089cafa7607@h18g2000yqo.googlegroups.com>
References: <4d167b6b-04fb-42bb-9c21-ab66d0fb4367@k17g2000yqb.googlegroups.com>	<mailman.1214.1269606975.23598.python-list@python.org>
	<f4f7a234-e1c4-4f5c-8b0b-a089cafa7607@h18g2000yqo.googlegroups.com>
Message-ID: <4BAD8068.3010309@mrabarnett.plus.com>

C. B. wrote:
> At first, thank you all for your answers.
> 
> Some more details about what I'm coding and what I need...
> 
> The classes AAA and BBB are just given as examples. In fact, BBB's
> constructor accepts several parameters, meaning it can be different
> for each creation of AAA. So it can't be simply skipped from the AAA's
> one, even if there can be a default value.
> 
> Making AAA do the call to BBB is a solution, but, in that case, the
> end-user loses the reference to the used BBB instance.
> 
> Concerning the reason why I wish to avoid importing, once again AAA
> and BBB were just examples. I plan to add more classes, so AAA will
> also need CCC, DDD, and so on to work.
> 
> It takes time to write the relative importations, that's ok, but I
> think it could be more pleasant for the end-user to not have to write
> a huge list of "from mymodule import xxx" if it is possible to take
> advantage of automatic importations.
> 
Couldn't you just have:

     import mymodule as m

and then use:

     m.AAA
     m.BBB

and so on?

It's not much longer and it avoids 'magic'.


From ldo at geek-central.gen.new_zealand  Sat Mar 27 00:37:10 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sat, 27 Mar 2010 17:37:10 +1300
Subject: GIF89A and PIL
References: <2010032618455468300-aptshansen@gmailinvalid>
Message-ID: <hok21n$bqo$2@lust.ihug.co.nz>

In message <2010032618455468300-aptshansen at gmailinvalid>, Stephen Hansen 
wrote:

> Is it possible to get PIL to save GIF's in GIF89A format, instead of
> GIF87A?

Why? What does GIF do for you that PNG doesn?t?


From apt.shansen at gmail.invalid  Sat Mar 27 00:53:10 2010
From: apt.shansen at gmail.invalid (Stephen Hansen)
Date: Fri, 26 Mar 2010 21:53:10 -0700
Subject: GIF89A and PIL
References: <2010032618455468300-aptshansen@gmailinvalid>
	<hok21n$bqo$2@lust.ihug.co.nz>
Message-ID: <2010032621531095506-aptshansen@gmailinvalid>

On 2010-03-26 21:37:10 -0700, Lawrence D'Oliveiro said:

> In message <2010032618455468300-aptshansen at gmailinvalid>, Stephen Hansen
> wrote:
> 
>> Is it possible to get PIL to save GIF's in GIF89A format, instead of
>> GIF87A?
> 
> Why? What does GIF do for you that PNG doesn?t?

If I take this PSD and save it as a GIF as fully optimized as possible, 
its 72 bytes; do the same with PNG, and its 120.

In this situation that difference really is very important.

-- 
--S

... p.s: change the ".invalid" to ".com" in email address to reply privately.



From greg.ewing at canterbury.ac.nz  Sat Mar 27 01:18:40 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sat, 27 Mar 2010 17:18:40 +1200
Subject: from import and __init__.py
In-Reply-To: <mailman.1197.1269556129.23598.python-list@python.org>
References: <20100325101632.GA4727@xs4all.nl> <hog3r2$8mr$1@dough.gmane.org>
	<mailman.1197.1269556129.23598.python-list@python.org>
Message-ID: <815i6bF3lcU1@mid.individual.net>

egbert wrote:

> Yes, you are right. And I can reach everything with
> modules['some_package']
> or variants thereof.

Although note that the usual way to get it would be
to simply do

   import some_package

-- 
Greg


From greg.ewing at canterbury.ac.nz  Sat Mar 27 01:23:19 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sat, 27 Mar 2010 17:23:19 +1200
Subject: Represent object type as
In-Reply-To: <6a6a37e3-f04f-4b63-9134-7ca9fd137297@f14g2000pre.googlegroups.com>
References: <6a6a37e3-f04f-4b63-9134-7ca9fd137297@f14g2000pre.googlegroups.com>
Message-ID: <815if2F3lcU2@mid.individual.net>

Jason wrote:
> I'm reusing the __getstate__ function I wrote for pickling like
> so:

Instead of reinventing part of pickle, is there some reason
you couldn't just use it?

-- 
Greg


From anythinginternetseo at gmail.com  Sat Mar 27 01:26:02 2010
From: anythinginternetseo at gmail.com (anything internet)
Date: Fri, 26 Mar 2010 22:26:02 -0700 (PDT)
Subject: Stop the Heat from Sun Rays!
Message-ID: <b04e5a8a-e2dd-4e11-a473-986645db29ef@t34g2000prm.googlegroups.com>

Stop the Heat! Stop UV Damage! Save Money! -
 More Details : http://www.suntechglasstinting.com/welcome.php


From matttibbals69 at yahoo.com  Sat Mar 27 01:48:45 2010
From: matttibbals69 at yahoo.com (matttibbals)
Date: Fri, 26 Mar 2010 22:48:45 -0700 (PDT)
Subject: python
Message-ID: <65354fef-2e84-4182-bfdb-69dc5468e9b6@f12g2000prn.googlegroups.com>

I'm Matt Tibbals, pedophile.  http://www.matthewtibbals.com


From lacrima.maxim at gmail.com  Sat Mar 27 02:10:59 2010
From: lacrima.maxim at gmail.com (Lacrima)
Date: Fri, 26 Mar 2010 23:10:59 -0700 (PDT)
Subject: Advanced Python Programming Oxford Lectures [was: Re: *Advanced* 
	Python book?]
References: mailman.1182.1269520510.23598.python-list@python.org 
	<54e41616-df9f-42dd-9c91-9e530650bd99@j21g2000yqh.googlegroups.com> 
	<9dd0d6b0-7249-4a6f-8d03-b0c3a44eace2@l25g2000yqd.googlegroups.com>
Message-ID: <fff09a1a-e925-46be-bdba-4ede830e55ab@k17g2000yqb.googlegroups.com>

On Mar 26, 10:22?am, Michele Simionato <michele.simion... at gmail.com>
wrote:
> On Mar 25, 2:24?pm, Michele Simionato <michele.simion... at gmail.com>
> wrote:
>
> > On Mar 25, 1:28?pm, Ethan Furman <et... at stoneleaf.us> wrote:
>
> > > Michele,
>
> > > Was wondering if you'd had a chance to re-post your lectures -- just did
> > > a search for them and came up empty, and I would love to read them!
>
> > > Many thanks in advance!
>
> > Oops, I forgot! I will try to make them available soon.
>
> Here they are:http://www.phyast.pitt.edu/~micheles/oxford-lectures.zip

Hello, Michele!
Thanks a lot for posting!!!


From vipshopper.us at hotmail.com  Sat Mar 27 03:53:05 2010
From: vipshopper.us at hotmail.com (marrylin)
Date: Sat, 27 Mar 2010 00:53:05 -0700 (PDT)
Subject: Hello,everybody,the good shoping place,the new year approaching, 
	click in. Let's facelift bar! ===== HTTP://loveshopping.us   ====
Message-ID: <31437927-ccfd-403f-b79e-e349e662b286@33g2000yqj.googlegroups.com>

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From steve at REMOVE-THIS-cybersource.com.au  Sat Mar 27 06:18:35 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 27 Mar 2010 10:18:35 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
Message-ID: <4baddb7b$0$27866$c3e8da3@news.astraweb.com>

On Fri, 26 Mar 2010 07:31:17 -0700, Steve Howell wrote:

> From a purely academic standpoint, I'm not convinced that sum() is
> inefficient in terms of big-O complexity, though.
> 
>  showell at showell-laptop:~$ python
>  Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41) [GCC 4.3.3] on
>  linux2
>  >>> class StupidList:
[...]

But it's not *sum* that is inefficient, it is sum *with a particular data 
structure*.

Sure, if you create your own data structure, you can make it as efficient 
as you like. Obviously the sum algorithm itself has to perform one 
addition per item, or O(N), which scales tolerably well. But each 
addition has a cost. If the cost is constant, then sum() as a whole 
remains O(N). But if the cost of addition varies with N, sum() degrades 
badly.

We can compare the performance of sum with different data structures, 
starting with plain integers versus long integers:

>>> from timeit import Timer
>>> setup = 'data = [%d]*%d'
>>> for i in range(6):
...     t1 = Timer('sum(data, 0)', setup % (1, 10**i))
...     t2 = Timer('sum(data, 0)', setup % (10**50, 10**i))
...     print min(t1.repeat(number=1000)),
...     print min(t2.repeat(number=1000))
...
0.00179290771484 0.00263810157776
0.00340414047241 0.00854396820068
0.0190401077271 0.0502791404724
0.155302047729 0.645124912262
0.794432878494 2.55748295784
7.97877693176 25.3812758923

Both scale about as well, but the cost varies significantly: arithmetic 
on very large longints is expensive.

Strings, with a trick to fool sum into accepting them, versus lists. Note 
that I changed the number of iterations from 6 down to 5. The reason why 
will become obvious:

>>> class EmptyStringStarter:
...     def __add__(self, other):
...         return other
... 
>>> empty = EmptyStringStarter()
>>> setup = """from __main__ import empty; data = [%r]*%d"""
>>> 
>>> for i in range(5):
...     t1 = Timer('sum(data, empty)', setup % ('a', 10**i))
...     t2 = Timer('sum(data, [])', setup % ([1], 10**i))
...     print min(t1.repeat(number=1000)),
...     print min(t2.repeat(number=1000))
...
0.00849103927612 0.00226998329163
0.0121459960938 0.0082700252533
0.0489149093628 0.186735153198
0.428920030594 5.28623914719
14.6552250385 589.102822065


Strings perform tolerably well, up to a point, but lists perform 
terribly. And in fact, the relatively good performance of strings is an 
artifact of recent versions of CPython. In Jython and IronPython, and 
older versions of CPython, it will behave as poorly as lists.


> I wonder how severely sum(), without
> the restriction, would underperform join() on modern versions of Python,
> though.


Take note that, in order to get an answer in reasonable time, I've 
reduced the number of timing iterations drastically:

>>> for i in range(6):
...     t1 = Timer('sum(data, empty)', setup % ('a', 10**i))
...     t2 = Timer('"".join(data)', setup % ('a', 10**i))
...     print min(t1.repeat(number=10)),
...     print min(t2.repeat(number=10))
...
8.89301300049e-05 1.09672546387e-05
0.000131845474243 2.19345092773e-05
0.000591993331909 9.29832458496e-05
0.0101289749146 0.00082802772522
0.365957021713 0.00884819030762
24.2072279453 0.0421011447906

Note the performance degradation of sum. It gets worse. Much worse:

>>> for i in range(4, 7):
...     t1 = Timer('sum(data, empty)', setup % ('a', 10**i))
...     t2 = Timer('"".join(data)', setup % ('a', 10**i))
...     print min(t1.repeat(number=1)),  # note fewer iterations
...     print min(t2.repeat(number=1))
...
0.031229019165 0.000817060470581
2.45445990562 0.00365781784058
1024.79705095 0.0398509502411

This is absolutely catastrophic performance degradation.



-- 
Steven


From davea at ieee.org  Sat Mar 27 06:18:40 2010
From: davea at ieee.org (Dave Angel)
Date: Sat, 27 Mar 2010 05:18:40 -0500
Subject: Traversing through Dir()
In-Reply-To: <d0fa7167-86e7-4ffa-953e-67b3c07b5f2d@q21g2000yqm.googlegroups.com>
References: <d2459161-1a78-4380-8687-1497c9349a9d@g11g2000yqe.googlegroups.com>	<hohqgi$kso$1@news.eternal-september.org>
	<d0fa7167-86e7-4ffa-953e-67b3c07b5f2d@q21g2000yqm.googlegroups.com>
Message-ID: <4BADDB80.90003@ieee.org>



Andrej Mitrovic wrote:
> On Mar 26, 9:18 am, "Alf P. Steinbach" <al... at start.no> wrote:
>   
>> <snip>
>> hierarchy =nspect.getclasstree( classes )
>> # 'hierarchy' is a list array of tuples and nested list arrays of the same form.
>> # The top level is an array of two items, the first item a tuple describing the
>> 'object'
>> # class, and the second item a list array representing the BaseException hierarchy.
>> print_hierarchy( hierarchy[1], level = )
>> </code>
>>
>> Cheers & hth.,
>>
>> - Alf
>>     
>
> Thanks for all of that. And yes, I've noticed I get into infinite
> recursions all the time, which is why I was asking if there was a
> simple way to do this. I'll have a look at these later.
>
> Kind regards,
> Andrej Mitrovic
>
>   
I can't help with the original question, but generally the cure for 
getting into infinite recursion when traversing a tree with multiple 
connections is to keep a set() of all visited nodes.  Whenever you hit a 
node a second time, don't visit it or its dependents.  It's not hard to 
add to otherwise working code, and frequently the easiest place is right 
at the beginning of the recursive function.
       if new_node in myset:
             return
      myset.add(new_node)
     ...process_this_node...
     for child in new_node:
           ...recurse...

HTH
DaveA



From v.harishankar at gmail.com  Sat Mar 27 07:06:36 2010
From: v.harishankar at gmail.com (Harishankar)
Date: Sat, 27 Mar 2010 11:06:36 +0000 (UTC)
Subject: Any examples/documentation for python-newt
Message-ID: <hokorf$21qc$4@news.telesweet.net>

I am writing a fairly featureful TUI in python and I figured newt is the 
best lightweight TUI which actually offers widgets. curses is low level 
and its text editing capabilities are poor while UIs like urwid and stfl 
too complex for simple programs like the ones I am creating.

Could anybody point me to at least a decent example program in newt/snack 
and I don't mean popcorn.py or peanuts.py. Something that at least shows 
how to create a basic menu-driven program in the command line with a main 
menu and implementing several sub menus. Also a bit of explanation of the 
behaviour of OK and Cancel buttons in standard forms would be of help.

So anybody uses newt? Or have people stopped using text based UIs 
completely?

-- 
-- Harishankar (http://harishankar.org http://literaryforums.org)



-- 
-- Harishankar (http://harishankar.org http://literaryforums.org)


From tartley at tartley.com  Sat Mar 27 07:28:56 2010
From: tartley at tartley.com (Jonathan Hartley)
Date: Sat, 27 Mar 2010 04:28:56 -0700 (PDT)
Subject: Classes as namespaces?
References: <hoihgt$p6t$1@reader1.panix.com>
	<69463be0-d839-43cf-a8a7-1cc9081f672d@r27g2000yqn.googlegroups.com>
Message-ID: <52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>

On Mar 26, 6:26?pm, Luis M. Gonz?lez <luis... at gmail.com> wrote:
> On 26 mar, 11:49, kj <no.em... at please.post> wrote:
>
> > What's the word on using "classes as namespaces"? ?E.g.
>
> > class _cfg(object):
> > ? ? spam = 1
> > ? ? jambon = 3
> > ? ? huevos = 2
>
> > breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
>
> I see no problem.
> I wouldn't mix English, French and Spanish in the same recipe though...


Hey everyone. By coincidence, only yesterday I was wondering about
using classes as a way of labeling a block of code, ie. an lightweight
alternative to defining a function that would only be called from one
location.

eg. instead of:


x = 1
((some complex logic))
y = 2


one might like to name the complex block of logic, just to make it
readable:


x = 1
def account_for_non_square_pixels(x):
   ((some complex logic))
account_for_non_square_pixels()
y = 2


But defining and then calling the function like that is a tad
cumbersome. So I was wondering about:



x = 1
class account_for_non_square_pixels:
  ((some complex logic))
y = 2


I don't exactly like this, but I think you can see what I'm getting
at. Does this fall down in some way I haven't grasped? Is it as awful
an abuse of 'class' as my intuition suggests it is? Is there a way to
do it better?


From jcd at sdf.lonestar.org  Sat Mar 27 07:54:06 2010
From: jcd at sdf.lonestar.org (J. Clifford Dyer)
Date: Sat, 27 Mar 2010 07:54:06 -0400
Subject: Classes as namespaces?
In-Reply-To: <52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
References: <hoihgt$p6t$1@reader1.panix.com>
	<69463be0-d839-43cf-a8a7-1cc9081f672d@r27g2000yqn.googlegroups.com>
	<52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
Message-ID: <20100327115406.GA22246@sdf.lonestar.org>

On Sat, Mar 27, 2010 at 04:28:56AM -0700, Jonathan Hartley wrote regarding Re: Classes as namespaces?:
> 
> Hey everyone. By coincidence, only yesterday I was wondering about
> using classes as a way of labeling a block of code, ie. an lightweight
> alternative to defining a function that would only be called from one
> location.
> 
> eg. instead of:
> 
> 
> x = 1
> ((some complex logic))
> y = 2
> 
> 
> one might like to name the complex block of logic, just to make it
> readable:
> 
> 
> x = 1
> def account_for_non_square_pixels(x):
>    ((some complex logic))
> account_for_non_square_pixels()
> y = 2
> 
> 
> But defining and then calling the function like that is a tad
> cumbersome. So I was wondering about:
> 
> 
> 
> x = 1
> class account_for_non_square_pixels:
>   ((some complex logic))
> y = 2
> 
> 
> I don't exactly like this, but I think you can see what I'm getting
> at. Does this fall down in some way I haven't grasped? Is it as awful
> an abuse of 'class' as my intuition suggests it is? Is there a way to
> do it better?
> -- 
> http://mail.python.org/mailman/listinfo/python-list

Hmm.  I don't like that because it leaves a class polluting your namespace that doesn't behave like a class.  Using a function for that purpose doesn't seem as bad, because even if you don't call it again, at least you *could*, and it would behave in an expected fashion.  

If you're dead-set against calling the chunk of code you just created, and you're using python 2.5 or higher, you might consider creating a no-op context manager:

    x = 1
    with code_block("Account for non square pixels"):
	    ((complex_logic))
	y = 2

Though in general, I think refactoring your code to reasonably scoped functions or methods is a better idea.  If it's too complex to read in one block, it's probably too complex for one function.


From jeanmichel at sequans.com  Sat Mar 27 07:54:42 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Sat, 27 Mar 2010 12:54:42 +0100
Subject: Classes as namespaces?
In-Reply-To: <52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
References: <hoihgt$p6t$1@reader1.panix.com>	<69463be0-d839-43cf-a8a7-1cc9081f672d@r27g2000yqn.googlegroups.com>
	<52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
Message-ID: <4BADF202.3090704@sequans.com>

Jonathan Hartley wrote:
> On Mar 26, 6:26 pm, Luis M. Gonz?lez <luis... at gmail.com> wrote:
>   
>> On 26 mar, 11:49, kj <no.em... at please.post> wrote:
>>
>>     
>>> What's the word on using "classes as namespaces"?  E.g.
>>>       
>>> class _cfg(object):
>>>     spam = 1
>>>     jambon = 3
>>>     huevos = 2
>>>       
>>> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
>>>       
>> I see no problem.
>> I wouldn't mix English, French and Spanish in the same recipe though...
>>     
>
>
> Hey everyone. By coincidence, only yesterday I was wondering about
> using classes as a way of labeling a block of code, ie. an lightweight
> alternative to defining a function that would only be called from one
> location.
>
> eg. instead of:
>
>
> x = 1
> ((some complex logic))
> y = 2
>
>
> one might like to name the complex block of logic, just to make it
> readable:
>
>
> x = 1
> def account_for_non_square_pixels(x):
>    ((some complex logic))
> account_for_non_square_pixels()
> y = 2
>
>
> But defining and then calling the function like that is a tad
> cumbersome. So I was wondering about:
>
>
>
> x = 1
> class account_for_non_square_pixels:
>   ((some complex logic))
> y = 2
>
>
> I don't exactly like this, but I think you can see what I'm getting
> at. Does this fall down in some way I haven't grasped? Is it as awful
> an abuse of 'class' as my intuition suggests it is? Is there a way to
> do it better?
>   
on good way to label part of the code is to simply add comments. You can 
also find tricks to indent this code block, but I've never seen that before.

x=1
# account for non square pixels
some complex logic
# done
y=2

I'm perfectly comfortable using classes for namespaces, 'cause classes 
implement objects or entities, and a namespaces can easily be designed 
as a coherent entity.
For labelling code that you will not reuse, I'm not sure classes are 
suitable in the way people may issue a 'WTF' when reading your code.

JM


From jcd at sdf.lonestar.org  Sat Mar 27 08:04:59 2010
From: jcd at sdf.lonestar.org (J. Clifford Dyer)
Date: Sat, 27 Mar 2010 08:04:59 -0400
Subject: Classes as namespaces?
In-Reply-To: <hoihgt$p6t$1@reader1.panix.com>
References: <hoihgt$p6t$1@reader1.panix.com>
Message-ID: <20100327120458.GB22246@sdf.lonestar.org>

On Fri, Mar 26, 2010 at 02:49:02PM +0000, kj wrote regarding Classes as namespaces?:
> 
> What's the word on using "classes as namespaces"?  E.g.
> 
> class _cfg(object):
>     spam = 1
>     jambon = 3 
>     huevos = 2
> 
> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
> 
> 
> Granted, this is not the "intended use" for classes, and therefore
> could be viewed as a misuse ("that's what dictionaries are for",
> etc.).  But other than this somewhat academic objection[*], I really
> can see no problem with using classes in this way.
> 
> And yet, I've come across online murky warnings against using
> classes as "pseudo-namespaces".  Is there some problem that I'm
> not seeing with this technique?
> 
> ~K

I don't see anything wrong with this, except that I would clean it up in a couple ways.  Like other posters, I would give the class a proper class name (Cfg).

I also would not assign integers to spam, jambon, or huevos.  Instead I would assign each a bare object().  That way you won't get unexpected interactions with other constants outside the class.  An object() is equal only to itself.

I would also not rule out letting your "pseudo-namespace" grow into a full-fledged class.  If you've got a method that makes sense with your class, use it.

class Cfg(object):
    spam = object()
	jambon = object()
    huevos = object()

	def get_animal(self, meat):
	    if meat == self.jambon:
			return 'pig'
		elif meat == self.huevos:
		    return 'chicken'
		elif meat = self.spam:
		    return 'spamalope'

Later, perhaps, you might refactor so that each meat type (OK so huevos aren't a meat) gets its own subclass, with a simple, one-line get_animal method.

Cheers,
Cliff


From steve at holdenweb.com  Sat Mar 27 08:22:17 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sat, 27 Mar 2010 08:22:17 -0400
Subject: Classes as namespaces?
In-Reply-To: <20100327120458.GB22246@sdf.lonestar.org>
References: <hoihgt$p6t$1@reader1.panix.com>
	<20100327120458.GB22246@sdf.lonestar.org>
Message-ID: <hoktap$alu$1@dough.gmane.org>

J. Clifford Dyer wrote:
> On Fri, Mar 26, 2010 at 02:49:02PM +0000, kj wrote regarding Classes
> as namespaces?:
>> What's the word on using "classes as namespaces"?  E.g.
>> 
>> class _cfg(object): spam = 1 jambon = 3 huevos = 2
>> 
>> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
>> 
[...]
> I also would not assign integers to spam, jambon, or huevos.  Instead
> I would assign each a bare object().  That way you won't get
> unexpected interactions with other constants outside the class.  An
> object() is equal only to itself.
> 
It also has the advantage (?) that you can use "is" (identity)
comparisons rather than testing for equality, though this is only a
readability issue, I suspect.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From jeanmichel at sequans.com  Sat Mar 27 08:42:07 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Sat, 27 Mar 2010 13:42:07 +0100
Subject: Automatic import ?
In-Reply-To: <f4f7a234-e1c4-4f5c-8b0b-a089cafa7607@h18g2000yqo.googlegroups.com>
References: <4d167b6b-04fb-42bb-9c21-ab66d0fb4367@k17g2000yqb.googlegroups.com>	<mailman.1214.1269606975.23598.python-list@python.org>
	<f4f7a234-e1c4-4f5c-8b0b-a089cafa7607@h18g2000yqo.googlegroups.com>
Message-ID: <4BADFD1F.5000405@sequans.com>

C. B. wrote:
> [snip]
> It takes time to write the relative importations, that's ok, but I
> think it could be more pleasant for the end-user to not have to write
> a huge list of "from mymodule import xxx" if it is possible to take
> advantage of automatic importations.
>
> Cheers,
>   

In that particular case, replace automatic by implicit, and you got the 
reason why it is not a good idea.
Maybe in your case the C habits clashes to the python habits.

Talking about python, if the user needs to know about BBB, then it has 
to import it, perdiod. If the user needs to know about many objects, 
then it has to import them all, explicitly.
However it looks like all your objects belong to the same module, 
quoting MRAB:

"
Couldn't you just have:

    import mymodule as m

and then use:

    m.AAA
    m.BBB
"


You don't like prefixing your object with the namespace they belong to ? 
Well, you should :o)

JM


PS : I would'n have renamed the module, but that falls into personal 
preferences.


From ethan at stoneleaf.us  Sat Mar 27 09:13:01 2010
From: ethan at stoneleaf.us (Ethan Furman)
Date: Sat, 27 Mar 2010 06:13:01 -0700
Subject: Simple Traits
Message-ID: <4BAE045D.3080604@stoneleaf.us>

Wow.

I just stumbled across one of Michele Simionato's offerings, called 
simple traits (strait for short) which looks *really* cool.

You can find it here: http://pypi.python.org/pypi/strait/0.5.1

Extremely quick summary:

Instead of multiple inheritance, with it's range of problems, use single 
inheritance for the basics, and include traits for various extra 
functionality that you want your class to have.

As a side note, one of his blog entries at Artima talks about using 
composition instead of mixins when constructing a class, e.g. by doing:

class foo(object):
   import baz
   def __init__(self):
     self.baz.do_something()

which has the benefit (over mixins) of avoiding name-space pollution, as 
well as being able to tell where your methods are coming from.  The cool 
thing (to me, at least) was the realization of being able to use import 
statements in class construction.

Thanks, Michele!!

~Ethan~


From ethan at stoneleaf.us  Sat Mar 27 09:19:02 2010
From: ethan at stoneleaf.us (Ethan Furman)
Date: Sat, 27 Mar 2010 06:19:02 -0700
Subject: Simple Traits Questions
Message-ID: <4BAE05C6.4070601@stoneleaf.us>

Okay, different post for my actual questions.  :)

On the PyPI page for strait (http://pypi.python.org/pypi/strait/0.5.1) 
it has the example of choosing which methods to keep in the composed class:

class TOSWidget(BaseWidget):
     __metaclass__ = include(Pack, Place, Grid)
     info = Pack.info.im_func
     config = Pack.config.im_func
     configure = Pack.configure.im_func
     slaves = Pack.slaves.im_func
     forget = Pack.forget.im_func
     propagate = Pack.propagate.im_func

My question is:

Why use

     info = Pack.info.im_func

instead of

     info = Pack.info

?

Any and all enlightenment appreciated!

~Ethan~


From philip at semanchuk.com  Sat Mar 27 09:26:40 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Sat, 27 Mar 2010 09:26:40 -0400
Subject: Classes as namespaces?
In-Reply-To: <20100327120458.GB22246@sdf.lonestar.org>
References: <hoihgt$p6t$1@reader1.panix.com>
	<20100327120458.GB22246@sdf.lonestar.org>
Message-ID: <A8DB1626-E510-41D1-B602-66BD0C870600@semanchuk.com>


On Mar 27, 2010, at 8:04 AM, J. Clifford Dyer wrote:

> On Fri, Mar 26, 2010 at 02:49:02PM +0000, kj wrote regarding Classes  
> as namespaces?:
>>
>> What's the word on using "classes as namespaces"?  E.g.
>>
>> class _cfg(object):
>>    spam = 1
>>    jambon = 3
>>    huevos = 2
>>
>> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
>>
>>
>> Granted, this is not the "intended use" for classes, and therefore
>> could be viewed as a misuse ("that's what dictionaries are for",
>> etc.).  But other than this somewhat academic objection[*], I really
>> can see no problem with using classes in this way.
>>
>> And yet, I've come across online murky warnings against using
>> classes as "pseudo-namespaces".  Is there some problem that I'm
>> not seeing with this technique?
>>
>> ~K
>
> I don't see anything wrong with this, except that I would clean it  
> up in a couple ways.  Like other posters, I would give the class a  
> proper class name (Cfg).
>
> I also would not assign integers to spam, jambon, or huevos.   
> Instead I would assign each a bare object().  That way you won't get  
> unexpected interactions with other constants outside the class.  An  
> object() is equal only to itself.

What I like about this method is that it will break the bad habit I  
see in junior programmers of making assumptions about the value of the  
constant. For instance, if they see that Cfg.JAMBON = 3 and hardcode 3  
in their code somewhere, that will work fine until someone re-orders  
the constants. Using object() instead forces them to use Cfg.JAMBON  
since the value will (probably) change with every run of the program.

It will also discourage bugs-waiting-to-happen like this:
if breakfast > Cfg.SPAM:
     print "Good news, breakfast is jambon or huevos"



bye
P




From ethan at stoneleaf.us  Sat Mar 27 09:34:45 2010
From: ethan at stoneleaf.us (Ethan Furman)
Date: Sat, 27 Mar 2010 06:34:45 -0700
Subject: Classes as namespaces?
In-Reply-To: <52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
References: <hoihgt$p6t$1@reader1.panix.com>	<69463be0-d839-43cf-a8a7-1cc9081f672d@r27g2000yqn.googlegroups.com>
	<52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
Message-ID: <4BAE0975.1090004@stoneleaf.us>

Jonathan Hartley wrote:
> Hey everyone. By coincidence, only yesterday I was wondering about
> using classes as a way of labeling a block of code, ie. an lightweight
> alternative to defining a function that would only be called from one
> location.
> 
> eg. instead of:
> 
> 
> x = 1
> ((some complex logic))
> y = 2
> 
> 
> one might like to name the complex block of logic, just to make it
> readable:
> 
> 
> x = 1
> def account_for_non_square_pixels(x):
>    ((some complex logic))
> account_for_non_square_pixels()
> y = 2
> 
> 
> But defining and then calling the function like that is a tad
> cumbersome. So I was wondering about:
> 
> 
> 
> x = 1
> class account_for_non_square_pixels:
>   ((some complex logic))
> y = 2
> 
> 
> I don't exactly like this, but I think you can see what I'm getting
> at. Does this fall down in some way I haven't grasped? Is it as awful
> an abuse of 'class' as my intuition suggests it is? Is there a way to
> do it better?

Both solutions look horrible to me, as both hurt readability.  Make your 
function somewhere else, then call it in the code.  Who cares if you 
only use it once?

x = 1
account_for_non_square_pixels()
y = 2

Isn't that easier to read?

And when you want to (read/change) the complex code, you have an easy 
place to go to do it.

~Ethan~


From jmheralds at gmail.com  Sat Mar 27 09:37:26 2010
From: jmheralds at gmail.com (James Heralds)
Date: Sat, 27 Mar 2010 06:37:26 -0700 (PDT)
Subject: Call for papers (Deadline Extended): SETP-10, USA, July 2010
Message-ID: <ce916d05-f4c8-484e-84c5-bd8a8c9c53f9@j21g2000yqh.googlegroups.com>

It would be highly appreciated if you could share this announcement
with your colleagues, students and individuals whose research is in
software engineering, software testing, software quality assurance,
software design and related areas.

Call for papers (Deadline Extended): SETP-10, USA, July 2010

The 2010 International Conference on Software Engineering Theory and
Practice (SETP-10) (website: http://www.PromoteResearch.org ) will be
held during 12-14 of July 2010 in Orlando, FL, USA.  SETP is an
important event in the areas of Software development, maintenance, and
other areas of software engineering and related topics.

The conference will be held at the same time and location where
several other major international conferences will be taking place.
The conference will be held as part of 2010 multi-conference
(MULTICONF-10). MULTICONF-10 will be held during July 12-14, 2010 in
Orlando, Florida, USA. The primary goal of MULTICONF is to promote
research and developmental activities in computer science, information
technology, control engineering, and related fields. Another goal is
to promote the dissemination of research to a multidisciplinary
audience and to facilitate communication among researchers,
developers, practitioners in different fields. The following
conferences are planned to be organized as part of MULTICONF-10.

?	International Conference on Artificial Intelligence and Pattern
Recognition (AIPR-10)
?	 International Conference on Automation, Robotics and Control
Systems (ARCS-10)
?	International Conference on Bioinformatics, Computational Biology,
Genomics and Chemoinformatics (BCBGC-10)
?	International Conference on Computer Communications and Networks
(CCN-10)
?	International Conference on Enterprise Information Systems and Web
Technologies (EISWT-10)
?	International Conference on High Performance Computing Systems
(HPCS-10)
?	International Conference on Information Security and Privacy
(ISP-10)
?	International Conference on Image and Video Processing and Computer
Vision (IVPCV-10)
?	International Conference on Software Engineering Theory and Practice
(SETP-10)
?	International Conference on Theoretical and Mathematical Foundations
of Computer Science (TMFCS-10)

MULTICONF-10 will be held at Imperial Swan Hotel and Suites.  It is a
full-service resort that puts you in the middle of the fun! Located
1/2 block south of the famed International Drive, the hotel is just
minutes from great entertainment like Walt Disney World? Resort,
Universal Studios and Sea World Orlando. Guests can enjoy free
scheduled transportation to these theme parks, as well as spacious
accommodations, outdoor pools and on-site dining ? all situated on 10
tropically landscaped acres. Here, guests can experience a full-
service resort with discount hotel pricing in Orlando.


We invite draft paper submissions. Please see the website
http://www.PromoteResearch.org  for more details.

Sincerely
James Heralds


From invalid at invalid.invalid  Sat Mar 27 10:44:23 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Sat, 27 Mar 2010 14:44:23 +0000 (UTC)
Subject: Any examples/documentation for python-newt
References: <hokorf$21qc$4@news.telesweet.net>
Message-ID: <hol5k7$dre$1@reader1.panix.com>

On 2010-03-27, Harishankar <v.harishankar at gmail.com> wrote:
> I am writing a fairly featureful TUI in python and I figured newt is the 
> best lightweight TUI which actually offers widgets. curses is low level 
> and its text editing capabilities are poor while UIs like urwid and stfl 
> too complex for simple programs like the ones I am creating.
>
> Could anybody point me to at least a decent example program in newt/snack 
> and I don't mean popcorn.py or peanuts.py. Something that at least shows 
> how to create a basic menu-driven program in the command line with a main 
> menu and implementing several sub menus. Also a bit of explanation of the 
> behaviour of OK and Cancel buttons in standard forms would be of help.
>
> So anybody uses newt? Or have people stopped using text based UIs 
> completely?

I've used it for some trivial stuff, but not for anything very
sophisticated.  Redhat's text-mode installer program (anaconda) was
written in Python using Newt (I believe it is why Newt was invented).
That's probably the most "full featured" example I know of.

-- 
Grant


From v.harishankar at gmail.com  Sat Mar 27 10:49:37 2010
From: v.harishankar at gmail.com (Harishankar)
Date: Sat, 27 Mar 2010 14:49:37 +0000 (UTC)
Subject: Any examples/documentation for python-newt
References: <hokorf$21qc$4@news.telesweet.net> <hol5k7$dre$1@reader1.panix.com>
Message-ID: <hol5u1$2t9h$1@news.telesweet.net>

On Sat, 27 Mar 2010 14:44:23 +0000, Grant Edwards wrote:

> On 2010-03-27, Harishankar <v.harishankar at gmail.com> wrote:
>> I am writing a fairly featureful TUI in python and I figured newt is
>> the best lightweight TUI which actually offers widgets. curses is low
>> level and its text editing capabilities are poor while UIs like urwid
>> and stfl too complex for simple programs like the ones I am creating.
>>
>> Could anybody point me to at least a decent example program in
>> newt/snack and I don't mean popcorn.py or peanuts.py. Something that at
>> least shows how to create a basic menu-driven program in the command
>> line with a main menu and implementing several sub menus. Also a bit of
>> explanation of the behaviour of OK and Cancel buttons in standard forms
>> would be of help.
>>
>> So anybody uses newt? Or have people stopped using text based UIs
>> completely?
> 
> I've used it for some trivial stuff, but not for anything very
> sophisticated.  Redhat's text-mode installer program (anaconda) was
> written in Python using Newt (I believe it is why Newt was invented).
> That's probably the most "full featured" example I know of.

Does your code use forms in an application loop? I am having a bit of 
trouble with getting the form to stack up properly when I displaying 
another. As far as I know the two examples uses a single instance of a 
form which is discarded immediately on exit.

If you have even a small code sample I wouldn't mind reading it! 

-- 
-- Harishankar (http://harishankar.org http://literaryforums.org)


From invalid at invalid.invalid  Sat Mar 27 10:56:30 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Sat, 27 Mar 2010 14:56:30 +0000 (UTC)
Subject: Any examples/documentation for python-newt
References: <hokorf$21qc$4@news.telesweet.net> <hol5k7$dre$1@reader1.panix.com>
	<hol5u1$2t9h$1@news.telesweet.net>
Message-ID: <hol6au$dre$4@reader1.panix.com>

On 2010-03-27, Harishankar <v.harishankar at gmail.com> wrote:

>> I've used it for some trivial stuff, but not for anything very
>> sophisticated.  Redhat's text-mode installer program (anaconda) was
>> written in Python using Newt (I believe it is why Newt was invented).
>> That's probably the most "full featured" example I know of.
>
> Does your code use forms in an application loop?

Not really.  It uses a series of forms.  I don't think I ever stack
forms.

> I am having a bit of trouble with getting the form to stack up
> properly when I displaying another. As far as I know the two examples
> uses a single instance of a form which is discarded immediately on
> exit.

That's pretty much all my program did.

> If you have even a small code sample I wouldn't mind reading it! 

I'm afraid I'm not at liberty to post it.

-- 
Grant



From aharrisreid at googlemail.com  Sat Mar 27 11:08:09 2010
From: aharrisreid at googlemail.com (Alan Harris-Reid)
Date: Sat, 27 Mar 2010 15:08:09 +0000
Subject: Super() function
In-Reply-To: <797c8cbd1003242042s32ee16bbxe6d937a16ab35a50@mail.gmail.com>
References: <4BAAD5E0.9050604@googlemail.com>
	<797c8cbd1003242042s32ee16bbxe6d937a16ab35a50@mail.gmail.com>
Message-ID: <4BAE1F59.4070800@googlemail.com>

?p wrote:
> Hi:
>  
> On 25 March 2010 11:17, Alan Harris-Reid <aharrisreid at googlemail.com 
> <mailto:aharrisreid at googlemail.com>> wrote:
>
>     Hi,
>
>     Using Python 3.1, I sometimes use the super() function to call the
>     equivalent method from a parent class, for example
>
>     def mymethod(self):
>       super().mymethod()
>       some more code...
>
>     Is there any way of writing the code so that the super() call is
>     generic and automatically recognises the name of the current
>     method (ie. something like super().thismethod()) or do I always
>     have to repeat the method name after super()?
>
>     TIA,
>     Alan
>     -- 
>     http://mail.python.org/mailman/listinfo/python-list
>
>
>
>
>    I think, the super() method is designed to delegate any method call 
> to one of the class in its mro list, and the super() function its self 
> return a 'super' object, so it is better to write what method you want 
> to delegate, maybe it's not the current method. 
>
> -- 
> Best wishes from Ray ...
Thanks Ray - I'll stick to repeating the method name.

Regards,
Alan

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From v.harishankar at gmail.com  Sat Mar 27 11:12:57 2010
From: v.harishankar at gmail.com (Harishankar)
Date: Sat, 27 Mar 2010 15:12:57 +0000 (UTC)
Subject: Any examples/documentation for python-newt
References: <hokorf$21qc$4@news.telesweet.net>
	<hol5k7$dre$1@reader1.panix.com> <hol5u1$2t9h$1@news.telesweet.net>
	<hol6au$dre$4@reader1.panix.com>
Message-ID: <hol79o$2t9h$2@news.telesweet.net>

On Sat, 27 Mar 2010 14:56:30 +0000, Grant Edwards wrote:

> On 2010-03-27, Harishankar <v.harishankar at gmail.com> wrote:
> 
>>> I've used it for some trivial stuff, but not for anything very
>>> sophisticated.  Redhat's text-mode installer program (anaconda) was
>>> written in Python using Newt (I believe it is why Newt was invented).
>>> That's probably the most "full featured" example I know of.
>>
>> Does your code use forms in an application loop?
> 
> Not really.  It uses a series of forms.  I don't think I ever stack
> forms.
> 
>> I am having a bit of trouble with getting the form to stack up properly
>> when I displaying another. As far as I know the two examples uses a
>> single instance of a form which is discarded immediately on exit.
> 
> That's pretty much all my program did.
> 
>> If you have even a small code sample I wouldn't mind reading it!
> 
> I'm afraid I'm not at liberty to post it.

Thanks anyway. 

I'm taking a look at text.py in the anaconda source code tree here: 
http://git.fedorahosted.org/git/anaconda.git?
p=anaconda.git;a=blob_plain;f=text.py;hb=HEAD

I'm afraid it looks as though newt was primarily built to display a 
series of forms in order, like an installer does, so it is inherently 
limited by that interface. However, it might still be what I can use...

-- 
Harishankar (http://harishankar.org http://literaryforums.org)


From alain at dpt-info.u-strasbg.fr  Sat Mar 27 11:17:46 2010
From: alain at dpt-info.u-strasbg.fr (Alain Ketterlin)
Date: Sat, 27 Mar 2010 16:17:46 +0100
Subject: GIF89A and PIL
References: <2010032618455468300-aptshansen@gmailinvalid>
Message-ID: <87oci9hjz9.fsf@dpt-info.u-strasbg.fr>

Stephen Hansen <apt.shansen at gmail.invalid> writes:

> Is it possible to get PIL to save GIF's in GIF89A format, instead of
> GIF87A?

GIF89 was patented. I guess that is why it isn't used by PIL. (The
patent has expired now, IIRC.) Anyway, PNG was supposed to replace GIF.

> If not, are there any decent other image libraries out there
> that anyone's familiar with? The only one I could find was
> PythonMagick, which seems completely undocumented. Or I'm blind.

I don't know PythonMagick, but it is based on ImageMagick, which is kind
of a swiss-knife in image manipulation and conversion. You could try the
standalone tools first, to see if you get what you want/need.

> But the problem is, I have a nice, small little 72 byte GIF89A file,
> that I want to do some slight tweaking on and then re-save. I noticed
> that even if I completely skipped the tweaking step and -just- saved,
> it exploded into a 919 byte GIF87A file. And in this context, bytes
> really, really matter. I picked GIF over PNG because the same file in
> PNG was 120 bytes :)
[...]
>>>> f = open('../tiles/BaseTemplate.gif', 'rb')
>>>> d1 = f.read()
>>>> len(d1)
> 73
>>>> d1
> 'GIF89a\x10\x00\x10\x00[...]'

Hmm, a 16x16 image. Don't expect much from the most sophisticated
formats (e.g, PNG), because their overhead (headers etc.) may well be
above the size of the data. Compression isn't usually targeted at small
files.

(BTW: "slight tweaking" may have an effect on file-size if it introduces
new colors, because GIF uses a color-table. I guess you know all this.)

GIF uses the LZW algorithm, and so does zip and gzip (the latter with an
additional layer of Huffmann coding). If your images are of fixed size,
you _may_ be better off compressing the raw data with a general purpose
compressor (i.e., gzip). Check the packages gzip and zlib.

-- Alain.


From vicente.soler at gmail.com  Sat Mar 27 11:24:26 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sat, 27 Mar 2010 08:24:26 -0700 (PDT)
Subject: function decorator-like function
Message-ID: <9935ff3e-ff2f-44b8-83f4-60883b1512ac@k17g2000yqb.googlegroups.com>

Hi,

Still learning Python, now decorators.

Before diving deeply into decorators, I'd like to apply a function to
another function.

My "extremely simple function" should print number 3, then the sum of
its 2 arguments.

Say that I call   f(5,7)
I'd like to get, somehow, 3 then 12.

I've tried the following:

def d(f):
    print 3
    return f

def f(a, b):
    print a+b

f=d(f)

However, it does not work. Calling f(5,7) only returns 12, (3 is
missing)
How should I proceed?


From pmaupin at gmail.com  Sat Mar 27 12:06:40 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sat, 27 Mar 2010 09:06:40 -0700 (PDT)
Subject: function decorator-like function
References: <9935ff3e-ff2f-44b8-83f4-60883b1512ac@k17g2000yqb.googlegroups.com>
Message-ID: <90fe2ae8-cf1e-4d89-8b6d-2802874e64b5@e7g2000yqf.googlegroups.com>

On Mar 27, 10:24?am, vsoler <vicente.so... at gmail.com> wrote:
> Hi,
>
> Still learning Python, now decorators.
>
> Before diving deeply into decorators, I'd like to apply a function to
> another function.
>
> My "extremely simple function" should print number 3, then the sum of
> its 2 arguments.
>
> Say that I call ? f(5,7)
> I'd like to get, somehow, 3 then 12.
>
> I've tried the following:
>
> def d(f):
> ? ? print 3
> ? ? return f
>
> def f(a, b):
> ? ? print a+b
>
> f=d(f)
>
> However, it does not work. Calling f(5,7) only returns 12, (3 is
> missing)
> How should I proceed?

>>> def d(f):
...     def wrapper(*args):
...         print 3
...         return f(*args)
...     return wrapper
...
>>> def f(a, b):
...     print a + b
...
>>> f = d(f)
>>> f(5, 7)
3
12

HTH,
Pat


From lkizer at cfl.rr.com  Sat Mar 27 12:21:02 2010
From: lkizer at cfl.rr.com (Larry Kizer)
Date: Sat, 27 Mar 2010 12:21:02 -0400
Subject: Ipython(x,y) Won't Run
Message-ID: <4bae3040$0$5117$9a6e19ea@unlimited.newshosting.com>

I uninstalled my previous version of Python and installed Python(x,y)
ver 2.6.2.0 in Windows XP - Install seemed to work fine but when I try to 
run
Ipython(x,y) I get the following error: python.exe has encountered a
problem and needs to close.  We are sorry for the inconvenience.
Any ideas? Thanks.

LK 




From vicente.soler at gmail.com  Sat Mar 27 12:21:06 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sat, 27 Mar 2010 09:21:06 -0700 (PDT)
Subject: function decorator-like function
References: <9935ff3e-ff2f-44b8-83f4-60883b1512ac@k17g2000yqb.googlegroups.com>
	<90fe2ae8-cf1e-4d89-8b6d-2802874e64b5@e7g2000yqf.googlegroups.com>
Message-ID: <c32492f2-3c6c-48a1-9dd4-f7faeed21347@k17g2000yqb.googlegroups.com>

On 27 mar, 17:06, Patrick Maupin <pmau... at gmail.com> wrote:
> On Mar 27, 10:24?am, vsoler <vicente.so... at gmail.com> wrote:
>
>
>
> > Hi,
>
> > Still learning Python, now decorators.
>
> > Before diving deeply into decorators, I'd like to apply a function to
> > another function.
>
> > My "extremely simple function" should print number 3, then the sum of
> > its 2 arguments.
>
> > Say that I call ? f(5,7)
> > I'd like to get, somehow, 3 then 12.
>
> > I've tried the following:
>
> > def d(f):
> > ? ? print 3
> > ? ? return f
>
> > def f(a, b):
> > ? ? print a+b
>
> > f=d(f)
>
> > However, it does not work. Calling f(5,7) only returns 12, (3 is
> > missing)
> > How should I proceed?
> >>> def d(f):
>
> ... ? ? def wrapper(*args):
> ... ? ? ? ? print 3
> ... ? ? ? ? return f(*args)
> ... ? ? return wrapper
> ...>>> def f(a, b):
>
> ... ? ? print a + b
> ...>>> f = d(f)
> >>> f(5, 7)
>
> 3
> 12
>
> HTH,
> Pat

Pat,

I think some lines are missing. I don't see "d" function defined. Any
lines above def wrapper?

Thank you


From vicente.soler at gmail.com  Sat Mar 27 12:24:51 2010
From: vicente.soler at gmail.com (vsoler)
Date: Sat, 27 Mar 2010 09:24:51 -0700 (PDT)
Subject: function decorator-like function
References: <9935ff3e-ff2f-44b8-83f4-60883b1512ac@k17g2000yqb.googlegroups.com>
	<90fe2ae8-cf1e-4d89-8b6d-2802874e64b5@e7g2000yqf.googlegroups.com> 
	<c32492f2-3c6c-48a1-9dd4-f7faeed21347@k17g2000yqb.googlegroups.com>
Message-ID: <b7dd0538-7300-476c-adfe-8b18b9f1bf9c@g4g2000yqa.googlegroups.com>

On 27 mar, 17:21, vsoler <vicente.so... at gmail.com> wrote:
> On 27 mar, 17:06, Patrick Maupin <pmau... at gmail.com> wrote:
>
>
>
> > On Mar 27, 10:24?am, vsoler <vicente.so... at gmail.com> wrote:
>
> > > Hi,
>
> > > Still learning Python, now decorators.
>
> > > Before diving deeply into decorators, I'd like to apply a function to
> > > another function.
>
> > > My "extremely simple function" should print number 3, then the sum of
> > > its 2 arguments.
>
> > > Say that I call ? f(5,7)
> > > I'd like to get, somehow, 3 then 12.
>
> > > I've tried the following:
>
> > > def d(f):
> > > ? ? print 3
> > > ? ? return f
>
> > > def f(a, b):
> > > ? ? print a+b
>
> > > f=d(f)
>
> > > However, it does not work. Calling f(5,7) only returns 12, (3 is
> > > missing)
> > > How should I proceed?
> > >>> def d(f):
>
> > ... ? ? def wrapper(*args):
> > ... ? ? ? ? print 3
> > ... ? ? ? ? return f(*args)
> > ... ? ? return wrapper
> > ...>>> def f(a, b):
>
> > ... ? ? print a + b
> > ...>>> f = d(f)
> > >>> f(5, 7)
>
> > 3
> > 12
>
> > HTH,
> > Pat
>
> Pat,
>
> I think some lines are missing. I don't see "d" function defined. Any
> lines above def wrapper?
>
> Thank you

Patrick,

I see what happened. The first line was somehow hidden.
Thank you very much.

Vicente Soler


From aharrisreid at googlemail.com  Sat Mar 27 12:43:11 2010
From: aharrisreid at googlemail.com (Alan Harris-Reid)
Date: Sat, 27 Mar 2010 16:43:11 +0000
Subject: Super() function
In-Reply-To: <op.u93uq1jyx6zn5v@gabriel.sleipnir-bsas>
References: <4BAAD5E0.9050604@googlemail.com>
	<op.u93uq1jyx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <4BAE359F.6090200@googlemail.com>

Gabriel Genellina wrote:
> <div class="moz-text-flowed">En Thu, 25 Mar 2010 00:17:52 -0300, Alan 
> Harris-Reid <aharrisreid at googlemail.com> escribi?:
>
>> Using Python 3.1, I sometimes use the super() function to call the 
>> equivalent method from a parent class, for example
>>
>> def mymethod(self):
>>     super().mymethod()
>>     some more code...
>>
>> Is there any way of writing the code so that the super() call is 
>> generic and automatically recognises the name of the current method 
>> (ie. something like super().thismethod()) or do I always have to 
>> repeat the method name after super()?
>
> This recipe does what you want:
> http://code.activestate.com/recipes/286195-selfsuper/
> (but requires a bit of black magic...)
>
Hi Gabriel - thanks for the reply.

Goodness me - that's a mighty complicated recipe for what I want to 
achieve!  I think I'll stick with repeating the method name - it's a 
small price to pay.

Regards,
Alan


From james.harris.1 at googlemail.com  Sat Mar 27 13:01:34 2010
From: james.harris.1 at googlemail.com (James Harris)
Date: Sat, 27 Mar 2010 10:01:34 -0700 (PDT)
Subject: Python database of plain text editable by notepad or vi
References: <93d7991f-d688-4692-b34f-2fa571cebbdf@q15g2000yqj.googlegroups.com>
	<46822448-2984-4ef6-85c7-bef834e2e86c@r1g2000yqj.googlegroups.com> 
	<3d897b92-9def-4339-ac19-b06b5fb9705e@e6g2000yqh.googlegroups.com> 
	<a62686e9-5b8e-4c24-a092-b95554b9536e@30g2000yqi.googlegroups.com>
Message-ID: <929d4c9a-ec2d-4b21-ac10-9ae099c040b0@q21g2000yqm.googlegroups.com>

On 26 Mar, 14:58, Jon Clements <jon... at googlemail.com> wrote:
> On 26 Mar, 09:49, James Harris <james.harri... at googlemail.com> wrote:
...
> > I'm toying with some
> > ideas for a way to help generate source code (in various languages,
> > not just Python). If it goes ahead the text files would be mainly
> > marked-up code snippets - with or without symbols that need to be
> > replaced.
>
> > Rather than write one single monolithic app I thought to split it into
> > reusable components. One part being data access could perhaps be an
> > existing database (and I'll take a look at jkn's suggestion).
>
> > Think of the database as similar to an associative array stored on
> > disk. The only difference is I may want to play fast and loose with
> > the keys in some ways - e.g. check for partial key matches or return a
> > list of part-matched keys. The language name could be part of the key
> > but I'd also need to store variants for specific language versions.
> > I'm not sure yet how it will all pan out. As I say, just throwing
> > around some ideas.
...
> Thanks for the explanation.

No problem. Thanks for taking an interest!

> Who admins and, who's editing this data?

For the app I have in mind a programmer would admin and edit the
files.

> I couldn't 100% guarantee that I could modify a text file and always
> put the right
> delimiter in the right place and remember to escape the relevant chars
> (and I'm
> probably not the 'average' user).

Apart from any markup each file would be just source code or, maybe,
individual fragments of source code so there would be few delimiters
to get right. And any that were wrong could be detected either by the
code writer or the compiler when used.

> Any opposition to just putting it in a 'proper' DB, then 'blobbing'
> the values?
> (or just integrate a procedure/script/function whatever your chosen
> RDBMS calls to choose it).
> Or in some systems, 'externally referencing'... loads of DB's have
> free front-ends,
> and there are lots of Python libraries.

I've thought of that. Like Ethan, though, I'd prefer simple text for
this. Databases, for good reasons, tend to obscure text. For one thing
it makes them more secure but it also makes them less transparent and
harder to examine and edit. For this app simple text files seem to be
the best option at the moment.

>
> I think perhaps, all I'm saying is, I'd choose a different approach.
> I'd provide a front-end, rather than choose to re-write the wheel over
> DB's.

Agreed. That was my reason for asking the question initially.

> Be nice to know how you get on, if you'd be so kind?

I don't know yet if it will be feasible but if I do eventually write
something I'll report back.

James


From tjreedy at udel.edu  Sat Mar 27 13:10:22 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sat, 27 Mar 2010 13:10:22 -0400
Subject: Classes as namespaces?
In-Reply-To: <52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
References: <hoihgt$p6t$1@reader1.panix.com>	<69463be0-d839-43cf-a8a7-1cc9081f672d@r27g2000yqn.googlegroups.com>
	<52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
Message-ID: <hole5s$tc5$1@dough.gmane.org>

On 3/27/2010 7:28 AM, Jonathan Hartley wrote:
> On Mar 26, 6:26 pm, Luis M. Gonz?lez<luis... at gmail.com>  wrote:

> But defining and then calling the function like that is a tad
> cumbersome. So I was wondering about:
>
>
>
> x = 1
> class account_for_non_square_pixels:
>    ((some complex logic))
> y = 2
>
>
> I don't exactly like this, but I think you can see what I'm getting
> at. Does this fall down in some way I haven't grasped?

The assignments within the class are performed within a new local 
namespace. So moving non-toy code within a class block will typically fail.




From pmaupin at gmail.com  Sat Mar 27 14:07:47 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sat, 27 Mar 2010 11:07:47 -0700 (PDT)
Subject: function decorator-like function
References: <9935ff3e-ff2f-44b8-83f4-60883b1512ac@k17g2000yqb.googlegroups.com>
	<90fe2ae8-cf1e-4d89-8b6d-2802874e64b5@e7g2000yqf.googlegroups.com> 
	<c32492f2-3c6c-48a1-9dd4-f7faeed21347@k17g2000yqb.googlegroups.com> 
	<b7dd0538-7300-476c-adfe-8b18b9f1bf9c@g4g2000yqa.googlegroups.com>
Message-ID: <40ba11d3-5a18-4da4-a48a-0dd815f3b459@35g2000yqm.googlegroups.com>

On Mar 27, 11:24?am, vsoler <vicente.so... at gmail.com> wrote:
> I see what happened. The first line was somehow hidden.
> Thank you very much.

You're welcome.  Sorry about the formatting.  Also, note that if your
decorator is complicated, you might want to use a class instead of a
nested function.  Here's the same thing, using a class (and using the
actual decorator syntax):

class d(object):
    def __init__(self, func):
        self.func = func
    def __call__(self, *args):
        print 3
        return self.func(*args)

@d
def f(a, b):
    print a + b

f(5, 7)

Pat


From pmaupin at gmail.com  Sat Mar 27 14:22:09 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sat, 27 Mar 2010 11:22:09 -0700 (PDT)
Subject: Classes as namespaces?
References: <hoihgt$p6t$1@reader1.panix.com>
	<69463be0-d839-43cf-a8a7-1cc9081f672d@r27g2000yqn.googlegroups.com>
	<52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com> 
	<mailman.1259.1269709837.23598.python-list@python.org>
Message-ID: <8db24743-f293-4f87-b2fa-d86291de2f86@j21g2000yqh.googlegroups.com>

On Mar 27, 12:10?pm, Terry Reedy <tjre... at udel.edu> wrote:
> On 3/27/2010 7:28 AM, Jonathan Hartley wrote:
>
> > On Mar 26, 6:26 pm, Luis M. Gonz?lez<luis... at gmail.com> ?wrote:
> > But defining and then calling the function like that is a tad
> > cumbersome. So I was wondering about:
>
> > x = 1
> > class account_for_non_square_pixels:
> > ? ?((some complex logic))
> > y = 2
> The assignments within the class are performed within
> a new local namespace.

I could be misunderstanding, but I think that may be the point.  When
you have what is basically a bunch of linear logic in Python,
sometimes it makes sense to break the logic up into separate
namespaces, such that you don't pollute the global namespace too badly
(which could cause obscure failures due to inadvertently reusing a
variable name which is not properly initialized on the second use).

As the OP mentioned, functions are typically used for this, but then
you have to decide if you are going to put all your functions above
all the rest of the code, or in-line, which is where they belong
according to the flow.  Either decision has drawbacks -- it is jarring
to see functions defined in the middle of a code flow, but it requires
extra work to page up and down to see code that is logically in the
middle of a code flow, but has been moved out to a sub-function
somewhere.

> So moving non-toy code within a class block
> will typically fail.

I think, as with moving non-toy code into a function, the point may be
to *force* (more obvious) failures when something is screwed up,
rather than allowing the silent failures that can easily occur with a
large number of only marginally related variables in one big
namespace.

I have done what (I think) the OP is suggesting in the distant past.
I don't know why I don't do it any more -- perhaps it is more of a
comfort thing, or maybe I have gotten better at choosing the right
abstraction points for the function boundaries so that I don't always
need to read the function code when I am reading the code that invokes
it.  But in any case, I don't personally think that:

a = 27
b = 30

class DoMoreComputation:
    c = a + b

d = DoMoreComputation.c

is a terrible, ugly thing, although it is not my current preference.

Regards,
Pat


From andrej.mitrovich at gmail.com  Sat Mar 27 15:29:39 2010
From: andrej.mitrovich at gmail.com (Andrej Mitrovic)
Date: Sat, 27 Mar 2010 12:29:39 -0700 (PDT)
Subject: Vertical line in function arguments
Message-ID: <3d96ca83-7741-483d-8449-d88dc0f445b7@y17g2000yqd.googlegroups.com>

There is this peace of code in a 3rd party module:

MidiIn.SetFilter(pypm.FILT_ACTIVE | pypm.FILT_CLOCK |
pypm.FILT_PITCHBEND |
                     pypm.FILT_NOTE)

What are the vertical lines in a function call such as this? This
actually calls a function from a Pyrex module that was compiled into
a .pyd. Those filters are hex constants, but I've no idea what these
vertical lines mean. Is this some form of binary "or" operation?


From andrej.mitrovich at gmail.com  Sat Mar 27 15:30:53 2010
From: andrej.mitrovich at gmail.com (Andrej Mitrovic)
Date: Sat, 27 Mar 2010 12:30:53 -0700 (PDT)
Subject: Vertical line in function arguments
References: <3d96ca83-7741-483d-8449-d88dc0f445b7@y17g2000yqd.googlegroups.com>
Message-ID: <150eb50d-6117-426b-a014-e6b1662a867e@19g2000yqu.googlegroups.com>

Well I hate it when this happens. I ask a question, and literally 2
seconds later I bump into the answer.

This explains it a bit: http://docs.python.org/library/stdtypes.html#bit-string-operations-on-integer-types


From lie.1296 at gmail.com  Sat Mar 27 15:48:21 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Sun, 28 Mar 2010 06:48:21 +1100
Subject: StringChain -- a data structure for managing large sequences
	of chunks of bytes
In-Reply-To: <pan.2010.03.22.08.07.48@REMOVE.THIS.cybersource.com.au>
References: <mailman.646.1268377905.23598.python-list@python.org>	<4b9a00ce$0$27822$c3e8da3@news.astraweb.com>	<mailman.1055.1269234593.23598.python-list@python.org>
	<pan.2010.03.22.08.07.48@REMOVE.THIS.cybersource.com.au>
Message-ID: <4bae6130$1@dnews.tpgi.com.au>

On 03/22/2010 07:07 PM, Steven D'Aprano wrote:
> Perhaps you should have said that it was a wrapper around deque giving 
> richer functionality, rather than giving the impression that it was a 
> brand new data structure invented by you. People are naturally going to 
> be more skeptical about a newly invented data structure than one based on 
> a reliable, component like deque.

Well, technically StringChain is not a data structure in the first
place. StringChain is a string; a string that is implemented using deque
data structure to make appending algorithmically efficient. It is not a
data structure, in the sense that I can't put arbitrary "thing" into the
data structure. In the same sense, "string" is also not a data structure
as "string" is an implementation of stream using "array" data structure;
"StringChain" is an implementation of stream using "deque" data structure.


From jenjenmu at gmail.com  Sat Mar 27 17:14:31 2010
From: jenjenmu at gmail.com (knobbyknees)
Date: Sat, 27 Mar 2010 14:14:31 -0700 (PDT)
Subject: Python Psycopg2 - Interface Error : Connection already closed
Message-ID: <c1879e24-b76f-49bb-b7cb-0b7c8274044d@f14g2000pre.googlegroups.com>

I'm not sure if this is the right group, but I'm hoping it is...

Basically, I'm trying to use pgloader, which depends on python and
psycopg2.  After banging my head against a wall, I found this:

Found this:
http://www.mail-archive.com/sqlalchemy at googlegroups.com/msg13209.html

Although, the suggestion didn't work for me at all...

Running this command:
/usr/bin/pgloader -c /var/mybin/pgconfs/fr.conf

Yields this in the pgloader.log (with the process just hanging)

more /tmp/pgloader.log
27-03-2010 12:22:53 pgloader     INFO     Logger initialized
27-03-2010 12:22:53 pgloader     INFO     Reformat path is ['/usr/
share/python-support/pgloader/reformat']
27-03-2010 12:22:53 pgloader     INFO     Will consider following
sections:
27-03-2010 12:22:53 pgloader     INFO       fixed
27-03-2010 12:22:54 fixed        INFO     fixed processing
27-03-2010 12:22:54 pgloader     INFO     All threads are started,
wait for them to terminate
27-03-2010 12:22:57 fixed        ERROR    connection already closed
27-03-2010 12:22:57 fixed        INFO     closing current database
connection

[pgsql]
host                  = localhost
port                  = 5432
base                  = frdb
user                  = username
pass                  = password


[fixed]
table                 = fr
format                = fixed
filename              = /var/www/fr.txt
...


This is what I see for the traceback:
Traceback (most recent call last):
  File "/usr/lib/python2.6/threading.py", line 525, in
__bootstrap_inner
    self.run()
  File "/usr/lib/pymodules/python2.6/pgloader/pgloader.py", line 847,
in run
    self.terminate()
  File "/usr/lib/pymodules/python2.6/pgloader/pgloader.py", line 874,
in terminate
    self.db.close()
  File "/usr/lib/pymodules/python2.6/pgloader/db.py", line 103, in
close
    self.dbconn.close()


I'm at a total loss here....  Can anyone please help me out?


From nocbos at gmail.com  Sat Mar 27 18:39:23 2010
From: nocbos at gmail.com (C. B.)
Date: Sat, 27 Mar 2010 15:39:23 -0700 (PDT)
Subject: Automatic import ?
References: <4d167b6b-04fb-42bb-9c21-ab66d0fb4367@k17g2000yqb.googlegroups.com>
	<mailman.1214.1269606975.23598.python-list@python.org>
	<f4f7a234-e1c4-4f5c-8b0b-a089cafa7607@h18g2000yqo.googlegroups.com>
	<mailman.1252.1269693746.23598.python-list@python.org>
Message-ID: <23f6145e-c44d-4d37-8e5e-a98636d4d452@i25g2000yqm.googlegroups.com>


> In that particular case, replace automatic by implicit, and you got the
> reason why it is not a good idea.
> Maybe in your case the C habits clashes to the python habits.
>

You're right !

As a C developer, I appreciate to only include <string.h> to deal with
strings, without wondering which other header provides size_t
definition.

> Talking about python, if the user needs to know about BBB, then it has
> to import it, perdiod. If the user needs to know about many objects,
> then it has to import them all, explicitly.

Ok. If this is the Python way of coding, that's ok for me. I will stop
now my quest for an automatic import and work like that.

The most interesting solution I have found until now is using
PyImport_AppendInittab() and PyEval_GetGlobals() functions. But this
also brings lots of problems (mainly namespaces and unloading).
Anyway, the time spent to look for a solution was a nice way to learn
Python internals :)

Cheers,


From saimapk81 at gmail.com  Sat Mar 27 18:51:43 2010
From: saimapk81 at gmail.com (saima81)
Date: Sat, 27 Mar 2010 15:51:43 -0700 (PDT)
Subject: "jobs in usa for foreigners" "jobs in usa hotels" "jobs in usa for uk
	citizens" "usa jobs" "usa jobs in afghanistan" "usa jobs application
	manager" 
	"usa jobs for non us citizens" on http://jobsinusa-net.blogspot.com/
Message-ID: <7fce4205-a64f-46dd-8066-cdfd45400183@a16g2000pre.googlegroups.com>

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From greg.ewing at canterbury.ac.nz  Sat Mar 27 18:56:21 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sun, 28 Mar 2010 10:56:21 +1200
Subject: Classes as namespaces?
In-Reply-To: <52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
References: <hoihgt$p6t$1@reader1.panix.com>
	<69463be0-d839-43cf-a8a7-1cc9081f672d@r27g2000yqn.googlegroups.com>
	<52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
Message-ID: <817g5kFb3mU1@mid.individual.net>

Jonathan Hartley wrote:

> def account_for_non_square_pixels(x):
>    ((some complex logic))
> account_for_non_square_pixels()

> class account_for_non_square_pixels:
>   ((some complex logic))

I don't see much advantage -- you're still leaving behind an
object that won't be used again.

If you're concerned about namespace pollution, there are a
couple of ways to clean it up:

1) Delete the function after using it:

   def account_for_non_square_pixels(x):
      ...
   account_for_non_square_pixels()
   del account_for_non_square_pixels

2) Use __all__ to specify which names you intend to export
(doesn't prevent anyone from importing something explicitly,
but at least it makes your intention clear, stops irrelevant
things appearing in dir() or help(), etc).

-- 
Greg


From greg.ewing at canterbury.ac.nz  Sat Mar 27 19:40:07 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Sun, 28 Mar 2010 11:40:07 +1200
Subject: Classes as namespaces?
In-Reply-To: <hoihgt$p6t$1@reader1.panix.com>
References: <hoihgt$p6t$1@reader1.panix.com>
Message-ID: <817inlFoj9U1@mid.individual.net>

kj wrote:
> What's the word on using "classes as namespaces"?

My only concern would be that classes do magical things with certain
types when you retrieve them as attributes (e.g. functions, property
descriptors), so you can't use one as a completely general purpose
transparent container. But for enum constants and the like this
isn't a problem.

If you're up for a bit of hackery, the following code tricks the
class statement into producing a module instead of a class:

from types import ModuleType

class MetaNamespace(ModuleType):

   def __init__(self, name, bases, dict):
     ModuleType.__init__(self, name)
     self.__file__ = __file__
     self.__dict__.update(dict)

Namespace = MetaNamespace.__new__(MetaNamespace)

class Foo(Namespace):

   ford = 42
   arthur = 88

print Foo
print Foo.__dict__

-- 
Greg


From robert.kern at gmail.com  Sat Mar 27 20:23:51 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Sat, 27 Mar 2010 19:23:51 -0500
Subject: Simple Traits Questions
In-Reply-To: <4BAE05C6.4070601@stoneleaf.us>
References: <4BAE05C6.4070601@stoneleaf.us>
Message-ID: <hom7jl$a75$1@dough.gmane.org>

On 2010-03-27 08:19 , Ethan Furman wrote:
> Okay, different post for my actual questions.  :)
>
> On the PyPI page for strait (http://pypi.python.org/pypi/strait/0.5.1)
> it has the example of choosing which methods to keep in the composed class:
>
> class TOSWidget(BaseWidget):
> __metaclass__ = include(Pack, Place, Grid)
> info = Pack.info.im_func
> config = Pack.config.im_func
> configure = Pack.configure.im_func
> slaves = Pack.slaves.im_func
> forget = Pack.forget.im_func
> propagate = Pack.propagate.im_func
>
> My question is:
>
> Why use
>
> info = Pack.info.im_func
>
> instead of
>
> info = Pack.info
>
> ?

Pack.info is an unbound method object attached to the Pack class, not a function 
object. It has some extra semantics on top of functions and is tied to the Pack 
class. The .im_func attribute gets the actual function object underneath. When 
defining the TOSWidget class, the objects defined in the suite under the class: 
statement need to be actual functions in order to be turned into unbound methods 
attached to the TOSWidget class.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From robert.kern at gmail.com  Sat Mar 27 20:25:23 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Sat, 27 Mar 2010 19:25:23 -0500
Subject: Ipython(x,y) Won't Run
In-Reply-To: <4bae3040$0$5117$9a6e19ea@unlimited.newshosting.com>
References: <4bae3040$0$5117$9a6e19ea@unlimited.newshosting.com>
Message-ID: <hom7mh$a75$2@dough.gmane.org>

On 2010-03-27 11:21 , Larry Kizer wrote:
> I uninstalled my previous version of Python and installed Python(x,y)
> ver 2.6.2.0 in Windows XP - Install seemed to work fine but when I try to
> run
> Ipython(x,y) I get the following error: python.exe has encountered a
> problem and needs to close.  We are sorry for the inconvenience.
> Any ideas? Thanks.

You will want to report Python(x,y) bugs here:

   http://www.pythonxy.com/

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From apt.shansen at gmail.invalid  Sat Mar 27 22:44:54 2010
From: apt.shansen at gmail.invalid (Stephen Hansen)
Date: Sat, 27 Mar 2010 19:44:54 -0700
Subject: GIF89A and PIL
References: <2010032618455468300-aptshansen@gmailinvalid>
	<87oci9hjz9.fsf@dpt-info.u-strasbg.fr>
Message-ID: <2010032719445464825-aptshansen@gmailinvalid>

On 2010-03-27 08:17:46 -0700, Alain Ketterlin said:

> Stephen Hansen <apt.shansen at gmail.invalid> writes:

>> If not, are there any decent other image libraries out there
>> that anyone's familiar with? The only one I could find was
>> PythonMagick, which seems completely undocumented. Or I'm blind.
> 
> I don't know PythonMagick, but it is based on ImageMagick, which is kind
> of a swiss-knife in image manipulation and conversion. You could try the
> standalone tools first, to see if you get what you want/need.

Well, I know it -can- do what I need, except the subprocess business 
isn't something I want to deal with. And the library seems utterly 
undocumented. :(

> Hmm, a 16x16 image. Don't expect much from the most sophisticated
> formats (e.g, PNG), because their overhead (headers etc.) may well be
> above the size of the data. Compression isn't usually targeted at small
> files.

Yeah, I don't expect much from PNG. The images are very small but I 
might be sending a LOT of them over a pipe which is fairly tight, so 
50-60 bytes matters. That's why I selected GIF.

> (BTW: "slight tweaking" may have an effect on file-size if it introduces
> new colors, because GIF uses a color-table. I guess you know all this.)

Yeah, I know this is possible, which is why the tweaking was to be very 
careful: these images all have only a couple indexed colors each, and I 
should be able to do the tweaks and not increase the size excessively.

However, the problem is: I left out all the tweaks and it still 
exploded in size.

Just opening, and then saving the same file with no changes at all, 
resulted in a 72 byte file growing to 920.

I thought it was GIF87a vs GIF89a... but have since come to determine 
it doesn't appear to be. I decided to give PNG a try again, since those 
extra 50 bytes *matter*, but if I can't get GIF to work, 50 is better 
then 900. Unfortunately, I hit the same wall there.

If I convert these itty-bitty images into PNG, they're about 120 bytes 
or so. Opening one in PNG, making no changes, and saving, results in 
the new file being 900 bytes too :(

So I wonder if there's just some hyper-optimization Photoshop does that 
PIL can't round-trip.

> GIF uses the LZW algorithm, and so does zip and gzip (the latter with an
> additional layer of Huffmann coding). If your images are of fixed size,
> you _may_ be better off compressing the raw data with a general purpose
> compressor (i.e., gzip). Check the packages gzip and zlib.

Hm. I hadn't thought of compressing the saved version. I could do that, 
I suppose: it just seems there is so much extra stuff which shouldn't 
be needed that's being saved out.

-- 
--S

... p.s: change the ".invalid" to ".com" in email address to reply privately.



From v.harishankar at gmail.com  Sat Mar 27 23:32:16 2010
From: v.harishankar at gmail.com (Harishankar)
Date: Sun, 28 Mar 2010 03:32:16 +0000 (UTC)
Subject: GIF89A and PIL
References: <2010032618455468300-aptshansen@gmailinvalid>
	<87oci9hjz9.fsf@dpt-info.u-strasbg.fr>
	<2010032719445464825-aptshansen@gmailinvalid>
Message-ID: <homik0$1leu$1@news.telesweet.net>

On Sat, 27 Mar 2010 19:44:54 -0700, Stephen Hansen wrote:

> On 2010-03-27 08:17:46 -0700, Alain Ketterlin said:
> 
>> Stephen Hansen <apt.shansen at gmail.invalid> writes:
> 
>>> If not, are there any decent other image libraries out there that
>>> anyone's familiar with? The only one I could find was PythonMagick,
>>> which seems completely undocumented. Or I'm blind.
>> 
>> I don't know PythonMagick, but it is based on ImageMagick, which is
>> kind of a swiss-knife in image manipulation and conversion. You could
>> try the standalone tools first, to see if you get what you want/need.
> 
> Well, I know it -can- do what I need, except the subprocess business
> isn't something I want to deal with. And the library seems utterly
> undocumented. :(
> 
>> Hmm, a 16x16 image. Don't expect much from the most sophisticated
>> formats (e.g, PNG), because their overhead (headers etc.) may well be
>> above the size of the data. Compression isn't usually targeted at small
>> files.
> 
> Yeah, I don't expect much from PNG. The images are very small but I
> might be sending a LOT of them over a pipe which is fairly tight, so
> 50-60 bytes matters. That's why I selected GIF.
> 
>> (BTW: "slight tweaking" may have an effect on file-size if it
>> introduces new colors, because GIF uses a color-table. I guess you know
>> all this.)
> 
> Yeah, I know this is possible, which is why the tweaking was to be very
> careful: these images all have only a couple indexed colors each, and I
> should be able to do the tweaks and not increase the size excessively.
> 
> However, the problem is: I left out all the tweaks and it still exploded
> in size.
> 
> Just opening, and then saving the same file with no changes at all,
> resulted in a 72 byte file growing to 920.
> 
> I thought it was GIF87a vs GIF89a... but have since come to determine it
> doesn't appear to be. I decided to give PNG a try again, since those
> extra 50 bytes *matter*, but if I can't get GIF to work, 50 is better
> then 900. Unfortunately, I hit the same wall there.
> 
> If I convert these itty-bitty images into PNG, they're about 120 bytes
> or so. Opening one in PNG, making no changes, and saving, results in the
> new file being 900 bytes too :(
> 
> So I wonder if there's just some hyper-optimization Photoshop does that
> PIL can't round-trip.
> 
>> GIF uses the LZW algorithm, and so does zip and gzip (the latter with
>> an additional layer of Huffmann coding). If your images are of fixed
>> size, you _may_ be better off compressing the raw data with a general
>> purpose compressor (i.e., gzip). Check the packages gzip and zlib.
> 
> Hm. I hadn't thought of compressing the saved version. I could do that,
> I suppose: it just seems there is so much extra stuff which shouldn't be
> needed that's being saved out.

This might not be of much use to you, but I've found by experience that 
PNGs are almost always bigger or equal to GIFs of the same resolution, 
colour depth and so on. I've never yet seen a PNG file that is smaller 
than a GIF for the same set of pixels.

As mentioned above, compressing raw data stream might be more beneficial 
in this situation.

Also try the pngcrush utility and see what size it gives you.
http://pmt.sourceforge.net/pngcrush/

-- 
Harishankar (http://harishankar.org http://literaryforums.org)


From apt.shansen at gmail.invalid  Sun Mar 28 00:31:16 2010
From: apt.shansen at gmail.invalid (Stephen Hansen)
Date: Sat, 27 Mar 2010 21:31:16 -0700
Subject: Classes as namespaces?
References: <hoihgt$p6t$1@reader1.panix.com>
Message-ID: <2010032721311671584-aptshansen@gmailinvalid>

On 2010-03-26 07:49:02 -0700, kj said:

> What's the word on using "classes as namespaces"?  E.g.
> 
> class _cfg(object):
>     spam = 1
>     jambon = 3
>     huevos = 2
> 
> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)
> 
> 
> Granted, this is not the "intended use" for classes, and therefore
> could be viewed as a misuse ("that's what dictionaries are for",
> etc.).  But other than this somewhat academic objection[*], I really
> can see no problem with using classes in this way.

On the contrary, this is the intended use of classes. Or at least, one 
of them. A class *is* a namespace, albeit one that you must address 
explicitly unlike the local and global namespaces which are usually 
implicit.

That said...

> [*] My own subjective dislike for the widespread practice of using
> triple quotes to comment out code is formally similar to this one
> ("the 'intended use' for triple-quoting is not to comment out code",
> etc.).  Here I find myself on the opposite side of the purist/pragmatic
> divide.  Hmmm.

What?!

Where do you get this "widespread practice"? You mentioned that before 
when you last posted about that and I forgot to comment. I've never 
seen it.

In the 110k lines of in-house code I maintain, we don't use it once; we 
have somewhere around 300k lines of third-party code from a wide range 
of sources, and although I haven't reviewed it all by any means, I 
regularly have to peek over it and I never seen triple quoted 
"comments".

Hell, I almost never see commented -code-. Code should only be 
commented while fiddling or debugging. Once fiddlng is done, dead code 
should be removed.

I'm sure it -happens- every once in awhile, but.. why? Who uses editors 
that can't block comment/uncomment anymore? :(

-- 
--S

... p.s: change the ".invalid" to ".com" in email address to reply privately.



From sccolbert at gmail.com  Sun Mar 28 01:21:18 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Sun, 28 Mar 2010 01:21:18 -0400
Subject: GIF89A and PIL
In-Reply-To: <homik0$1leu$1@news.telesweet.net>
References: <2010032618455468300-aptshansen@gmailinvalid>
	<87oci9hjz9.fsf@dpt-info.u-strasbg.fr>
	<2010032719445464825-aptshansen@gmailinvalid>
	<homik0$1leu$1@news.telesweet.net>
Message-ID: <7f014ea61003272221t15e84931hf56411ecd00a1cb5@mail.gmail.com>

since the images only use a couple colors each, just run length encode it.
Depending on the image, you may be able to get a super small size that way,
and avoid the whole mess.

On Sat, Mar 27, 2010 at 11:32 PM, Harishankar <v.harishankar at gmail.com>wrote:

> On Sat, 27 Mar 2010 19:44:54 -0700, Stephen Hansen wrote:
>
> > On 2010-03-27 08:17:46 -0700, Alain Ketterlin said:
> >
> >> Stephen Hansen <apt.shansen at gmail.invalid> writes:
> >
> >>> If not, are there any decent other image libraries out there that
> >>> anyone's familiar with? The only one I could find was PythonMagick,
> >>> which seems completely undocumented. Or I'm blind.
> >>
> >> I don't know PythonMagick, but it is based on ImageMagick, which is
> >> kind of a swiss-knife in image manipulation and conversion. You could
> >> try the standalone tools first, to see if you get what you want/need.
> >
> > Well, I know it -can- do what I need, except the subprocess business
> > isn't something I want to deal with. And the library seems utterly
> > undocumented. :(
> >
> >> Hmm, a 16x16 image. Don't expect much from the most sophisticated
> >> formats (e.g, PNG), because their overhead (headers etc.) may well be
> >> above the size of the data. Compression isn't usually targeted at small
> >> files.
> >
> > Yeah, I don't expect much from PNG. The images are very small but I
> > might be sending a LOT of them over a pipe which is fairly tight, so
> > 50-60 bytes matters. That's why I selected GIF.
> >
> >> (BTW: "slight tweaking" may have an effect on file-size if it
> >> introduces new colors, because GIF uses a color-table. I guess you know
> >> all this.)
> >
> > Yeah, I know this is possible, which is why the tweaking was to be very
> > careful: these images all have only a couple indexed colors each, and I
> > should be able to do the tweaks and not increase the size excessively.
> >
> > However, the problem is: I left out all the tweaks and it still exploded
> > in size.
> >
> > Just opening, and then saving the same file with no changes at all,
> > resulted in a 72 byte file growing to 920.
> >
> > I thought it was GIF87a vs GIF89a... but have since come to determine it
> > doesn't appear to be. I decided to give PNG a try again, since those
> > extra 50 bytes *matter*, but if I can't get GIF to work, 50 is better
> > then 900. Unfortunately, I hit the same wall there.
> >
> > If I convert these itty-bitty images into PNG, they're about 120 bytes
> > or so. Opening one in PNG, making no changes, and saving, results in the
> > new file being 900 bytes too :(
> >
> > So I wonder if there's just some hyper-optimization Photoshop does that
> > PIL can't round-trip.
> >
> >> GIF uses the LZW algorithm, and so does zip and gzip (the latter with
> >> an additional layer of Huffmann coding). If your images are of fixed
> >> size, you _may_ be better off compressing the raw data with a general
> >> purpose compressor (i.e., gzip). Check the packages gzip and zlib.
> >
> > Hm. I hadn't thought of compressing the saved version. I could do that,
> > I suppose: it just seems there is so much extra stuff which shouldn't be
> > needed that's being saved out.
>
> This might not be of much use to you, but I've found by experience that
> PNGs are almost always bigger or equal to GIFs of the same resolution,
> colour depth and so on. I've never yet seen a PNG file that is smaller
> than a GIF for the same set of pixels.
>
> As mentioned above, compressing raw data stream might be more beneficial
> in this situation.
>
> Also try the pngcrush utility and see what size it gives you.
> http://pmt.sourceforge.net/pngcrush/
>
> --
> Harishankar (http://harishankar.org http://literaryforums.org)
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From python at rcn.com  Sun Mar 28 02:36:40 2010
From: python at rcn.com (Raymond Hettinger)
Date: Sat, 27 Mar 2010 23:36:40 -0700 (PDT)
Subject: Classes as namespaces?
References: <hoihgt$p6t$1@reader1.panix.com>
Message-ID: <03b4f91e-39aa-4b97-a510-fa784ad906f6@u5g2000prd.googlegroups.com>

On Mar 26, 7:49?am, kj <no.em... at please.post> wrote:
> What's the word on using "classes as namespaces"? ?E.g.
>
> class _cfg(object):
> ? ? spam = 1
> ? ? jambon = 3
> ? ? huevos = 2
>
> breakfast = (_cfg.spam, _cfg.jambon, _cfg.huevos)

Works for me.


Raymond


From catalinfest at gmail.com  Sun Mar 28 02:59:05 2010
From: catalinfest at gmail.com (catalinfest at gmail.com)
Date: Sat, 27 Mar 2010 23:59:05 -0700 (PDT)
Subject: Encryption source code with md5
Message-ID: <91541c26-6f18-40c7-a0df-252a52bb7cd5@l25g2000yqd.googlegroups.com>

Dear friends .

I have two simple questions:
It is possible to encrypt with md5 python source code?
What option do I have to protect my python source code?

Thank you .


From garabik-news-2005-05 at kassiopeia.juls.savba.sk  Sun Mar 28 03:22:11 2010
From: garabik-news-2005-05 at kassiopeia.juls.savba.sk (garabik-news-2005-05 at kassiopeia.juls.savba.sk)
Date: Sun, 28 Mar 2010 07:22:11 +0000 (UTC)
Subject: GIF89A and PIL
References: <2010032618455468300-aptshansen@gmailinvalid>
	<87oci9hjz9.fsf@dpt-info.u-strasbg.fr>
	<2010032719445464825-aptshansen@gmailinvalid>
	<homik0$1leu$1@news.telesweet.net>
Message-ID: <hon032$fhn$1@speranza.aioe.org>

Harishankar <v.harishankar at gmail.com> wrote:
> 
>> Just opening, and then saving the same file with no changes at all,
>> resulted in a 72 byte file growing to 920.
>> 
>> I thought it was GIF87a vs GIF89a... but have since come to determine it
>> doesn't appear to be. I decided to give PNG a try again, since those
>> extra 50 bytes *matter*, but if I can't get GIF to work, 50 is better
>> then 900. Unfortunately, I hit the same wall there.
>> 
 
> Also try the pngcrush utility and see what size it gives you.
> http://pmt.sourceforge.net/pngcrush/
>

optipng gives slightly better results. 

Anyway, depending on your pictures, you might find out that using
*.ppm.gz, *.pgm.gz or *.pbm.gz outperforms both optimised gif ad png...
and if sending more pictures down the line, tar-ing them (*.p?m) and
compressing the result will give even better sizes.


-- 
 -----------------------------------------------------------
| Radovan Garab?k http://kassiopeia.juls.savba.sk/~garabik/ |
| __..--^^^--..__    garabik @ kassiopeia.juls.savba.sk     |
 -----------------------------------------------------------
Antivirus alert: file .signature infected by signature virus.
Hi! I'm a signature virus! Copy me into your signature file to help me spread!


From agoretoy at gmail.com  Sun Mar 28 04:15:22 2010
From: agoretoy at gmail.com (alex goretoy)
Date: Sun, 28 Mar 2010 02:15:22 -0600
Subject: Encryption source code with md5
In-Reply-To: <91541c26-6f18-40c7-a0df-252a52bb7cd5@l25g2000yqd.googlegroups.com>
References: <91541c26-6f18-40c7-a0df-252a52bb7cd5@l25g2000yqd.googlegroups.com>
Message-ID: <c9d33c541003280115g5ae4dae7g752931f5bd7df82b@mail.gmail.com>

There's not many options when it comes to obfuscating python source. If you
even do find a way to obfuscate it. It won't take much to reverse it. That's
just how python works. Really I wouldn't even worry about looking for a way
to do this, reason behind that is that it's not difficult to reverse it.
This is not c,c++, php or java man/woman. Good luck.

Thank you,
-Alex Goretoy
http://launchpad.net/~a1g


On Sun, Mar 28, 2010 at 12:59 AM, catalinfest at gmail.com <
catalinfest at gmail.com> wrote:

> Dear friends .
>
> I have two simple questions:
> It is possible to encrypt with md5 python source code?
> What option do I have to protect my python source code?
>
> Thank you .
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From starglider.dev at gmail.com  Sun Mar 28 06:02:03 2010
From: starglider.dev at gmail.com (starglider develop)
Date: Sun, 28 Mar 2010 11:02:03 +0100
Subject: Encryption source code with md5
In-Reply-To: <91541c26-6f18-40c7-a0df-252a52bb7cd5@l25g2000yqd.googlegroups.com>
References: <91541c26-6f18-40c7-a0df-252a52bb7cd5@l25g2000yqd.googlegroups.com>
Message-ID: <a7268e571003280302v6d7efb51w17a03d424127d97a@mail.gmail.com>

py2exe

On 28 March 2010 07:59, catalinfest at gmail.com <catalinfest at gmail.com> wrote:

> Dear friends .
>
> I have two simple questions:
> It is possible to encrypt with md5 python source code?
> What option do I have to protect my python source code?
>
> Thank you .
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From ldo at geek-central.gen.new_zealand  Sun Mar 28 06:08:22 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Sun, 28 Mar 2010 23:08:22 +1300
Subject: Encryption source code with md5
References: <91541c26-6f18-40c7-a0df-252a52bb7cd5@l25g2000yqd.googlegroups.com>
Message-ID: <hon9qm$8ei$2@lust.ihug.co.nz>

In message <91541c26-6f18-40c7-
a0df-252a52bb7cd5 at l25g2000yqd.googlegroups.com>, catalinfest at gmail.com 
wrote:

> It is possible to encrypt with md5 python source code?

Don?t use MD5.

> What option do I have to protect my python source code?

Copyright.


From news1234 at free.fr  Sun Mar 28 06:25:36 2010
From: news1234 at free.fr (News123)
Date: Sun, 28 Mar 2010 12:25:36 +0200
Subject: Classes as namespaces?
In-Reply-To: <2010032721311671584-aptshansen@gmailinvalid>
References: <hoihgt$p6t$1@reader1.panix.com>
	<2010032721311671584-aptshansen@gmailinvalid>
Message-ID: <4baf2ea0$0$4595$426a74cc@news.free.fr>

Hi STephen,

Stephen Hansen wrote:

> That said...
> 
>> [*] My own subjective dislike for the widespread practice of using
>> triple quotes to comment out code is formally similar to this one
>> ("the 'intended use' for triple-quoting is not to comment out code",
>> etc.).  Here I find myself on the opposite side of the purist/pragmatic
>> divide.  Hmmm.
> 
> What?!
> 
> Where do you get this "widespread practice"? You mentioned that before
> when you last posted about that and I forgot to comment. I've never seen
> it.
I wouldn't say it's wide spread, but definitely something one
encounters. Especially with python rather new to python
> 
> In the 110k lines of in-house code I maintain, we don't use it once; we
> have somewhere around 300k lines of third-party code from a wide range
> of sources, and although I haven't reviewed it all by any means, I
> regularly have to peek over it and I never seen triple quoted "comments".
> 
> Hell, I almost never see commented -code-. Code should only be commented
> while fiddling or debugging. Once fiddlng is done, dead code should be
> removed.
> 
> I'm sure it -happens- every once in awhile, but.. why? Who uses editors
> that can't block comment/uncomment anymore? :(

I had to explain block comment / uncomment to some collegues before the
triple quote commenting disappeared from our code.
Unfortunaltely everybody uses a different type of editor, so I googled
for them to show them what their editors can do.

You'd be surprised how many people do neither master their editors nor
care for it.

bye

N


From python at bdurham.com  Sun Mar 28 06:48:52 2010
From: python at bdurham.com (python at bdurham.com)
Date: Sun, 28 Mar 2010 06:48:52 -0400
Subject: Programmatically discovering encoding types supported by codecs 
	module
In-Reply-To: <op.u93gdxodx6zn5v@gabriel.sleipnir-bsas>
References: <1269447436.19612.1366507993@webmail.messagingengine.com><op.u921zuyjx6zn5v@gabriel.sleipnir-bsas><1269453527.7192.1366528303@webmail.messagingengine.com>
	<op.u93gdxodx6zn5v@gabriel.sleipnir-bsas>
Message-ID: <1269773332.19498.1367099243@webmail.messagingengine.com>

Gabriel,

Thank you for your analysis - very interesting. Enjoyed your fromlist
choice of names. I'm still in my honeymoon phase with Python so I only
know the first part :)

Regards,
Malcolm


----- Original message -----
From: "Gabriel Genellina" <gagsl-py2 at yahoo.com.ar>
To: python-list at python.org
Date: Wed, 24 Mar 2010 19:50:11 -0300
Subject: Re: Programmatically discovering encoding types supported by
codecs    module

En Wed, 24 Mar 2010 14:58:47 -0300, <python at bdurham.com> escribi?:

>> After looking at how things are done in codecs.c and  
>> encodings/__init__.py  I think you should enumerate all modules in the  
>> encodings package that define a getregentry function. Aliases come from  
>> encodings.aliases.aliases.
>
> Thanks for looking into this for me. Benjamin Kaplan made a similar
> observation. My reply to him included the snippet of code we're using to
> generate the actual list of encodings that our software will support
> (thanks to Python's codecs and encodings modules).

I was curious as whether both methods would give the same results:

py> modules=set()
py> for name in glob.glob(os.path.join(encodings.__path__[0], "*.py")):
...   name = os.path.basename(name)[:-3]
...   try: mod = __import__("encodings."+name,  
fromlist=['ilovepythonbutsometimesihateit'])
...   except ImportError: continue
...   if hasattr(mod, 'getregentry'):
...     modules.add(name)
...
py> fromalias = set(encodings.aliases.aliases.values())
py> fromalias - modules
set(['tactis'])
py> modules - fromalias
set(['charmap',
      'cp1006',
      'cp737',
      'cp856',
      'cp874',
      'cp875',
      'idna',
      'iso8859_1',
      'koi8_u',
      'mac_arabic',
      'mac_centeuro',
      'mac_croatian',
      'mac_farsi',
      'mac_romanian',
      'palmos',
      'punycode',
      'raw_unicode_escape',
      'string_escape',
      'undefined',
      'unicode_escape',
      'unicode_internal',
      'utf_8_sig'])

There is a missing 'tactis' encoding (?) and about twenty without alias.

-- 
Gabriel Genellina

-- 
http://mail.python.org/mailman/listinfo/python-list



From arunbgg at gmail.com  Sun Mar 28 07:09:05 2010
From: arunbgg at gmail.com (Arun Balagopal)
Date: Sun, 28 Mar 2010 16:39:05 +0530
Subject: Need help with using SOAP based web service
Message-ID: <29c2bde91003280409y7460ca50oabacec7f1271d0ca@mail.gmail.com>

Hi,
I am working on a project in text mining using Python. As part of the
project I need to use a technical term extractor, and I found the
Termine<http://www.nactem.ac.uk/software/termine/#form>system from
NACTEM very useful. I have used the web demo (it's pretty nifty)
and now want to integrate it in my project. The service provides a SOAP
interface, which I am trying to use in Python with the ZSI 2.0 module (I
have never used it before). The sample client scripts and instructions for
Python are provided here<http://www.nactem.ac.uk/software/termine/webservice/>

Here's what I did. I installed ZSI 2.0 and its dependency PyXml. Then as
given in the instructions, I generated wrappers for the service (2 python
files). However when I try to run the sample script, I get errors (something
about no attribute 'typecode'). I have tried tweaking in the source, but
still no luck.

If anybody knows how exactly to get this thing working, please help. I am
new to the mailing list, and I apologize if this is the wrong place to post
such questions.

Thank you
-------------- next part --------------
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From irmen.NOSPAM at xs4all.nl  Sun Mar 28 07:17:24 2010
From: irmen.NOSPAM at xs4all.nl (Irmen de Jong)
Date: Sun, 28 Mar 2010 13:17:24 +0200
Subject: Encryption source code with md5
In-Reply-To: <hon9qm$8ei$2@lust.ihug.co.nz>
References: <91541c26-6f18-40c7-a0df-252a52bb7cd5@l25g2000yqd.googlegroups.com>
	<hon9qm$8ei$2@lust.ihug.co.nz>
Message-ID: <4baf3ac4$0$22903$e4fe514c@news.xs4all.nl>

On 28-3-2010 12:08, Lawrence D'Oliveiro wrote:
> In message<91541c26-6f18-40c7-
> a0df-252a52bb7cd5 at l25g2000yqd.googlegroups.com>, catalinfest at gmail.com
> wrote:
>
>> It is possible to encrypt with md5 python source code?
>
> Don?t use MD5.

Also, md5 is not an encryption algorithm at all, it is a secure hashing function.
(well, not so secure anymore nowadays, which probably is why Lawrence already wrote to 
avoid using it).

irmen


From kelithaem at gmail.com  Sun Mar 28 07:30:51 2010
From: kelithaem at gmail.com (Rolla)
Date: Sun, 28 Mar 2010 04:30:51 -0700 (PDT)
Subject: AUTHENTIC DESIGNER HANDBAGS ACCESSORIES GREAT DISCOUNTS! 
	WWW.VOGUELANDE.COM
Message-ID: <5820a042-2e7d-4f3a-a672-cd4a4315a72f@g28g2000prb.googlegroups.com>

Dear Customer,

We now have NEW ARRIVAL accessories coming. Please check the site as
follows,

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From zaq2442 at gmail.com  Sun Mar 28 08:12:49 2010
From: zaq2442 at gmail.com (=?UTF-8?B?2KfYp9in2KfZhNmI2KfZgdmK?=)
Date: Sun, 28 Mar 2010 05:12:49 -0700 (PDT)
Subject: =?windows-1256?B?0czhIM3H4+Eg3e0gx+Hf5u3KICEhISDV5tE=?=
Message-ID: <0a44111d-e4f8-4822-a4cd-828bb3fa54a8@q15g2000yqj.googlegroups.com>

http://www.nb11.net/vb/forumdisplay.php?f=25


From catalinfest at gmail.com  Sun Mar 28 09:00:58 2010
From: catalinfest at gmail.com (catalinfest at gmail.com)
Date: Sun, 28 Mar 2010 06:00:58 -0700 (PDT)
Subject: Encryption source code with md5
References: <91541c26-6f18-40c7-a0df-252a52bb7cd5@l25g2000yqd.googlegroups.com>
	<hon9qm$8ei$2@lust.ihug.co.nz>
	<4baf3ac4$0$22903$e4fe514c@news.xs4all.nl>
Message-ID: <e8546002-d379-45fc-b834-753cdcccb91a@k13g2000yqe.googlegroups.com>

I had a talk about Python and distribution of commercial products
created with python. This made me think of a way to protect my source
code to be distributed. I thought a live CD version and then to an
encryption method of a portion of source code. These thoughts are the
source of two questions.


From l.quesada at 4c.ucc.ie  Sun Mar 28 09:26:43 2010
From: l.quesada at 4c.ucc.ie (Luis Quesada)
Date: Sun, 28 Mar 2010 14:26:43 +0100
Subject: map, index
Message-ID: <mOIrn.824$I8.247@news.indigo.ie>

Dear all,

I am new to Python, so I apologize in advance if you find my questions 
naive (or if they have been already answered in this forum).

1. What is the most pythonic way of mapping a list where the value each 
element is mapped to depends on the index of the element. Is there a way 
of writing the following without using zip:
	map(lambda (id,v):id*v,zip(range(len(L)),L))
I wonder whether there is something like mapInd in Oz 
(http://www.mozart-oz.org/documentation/base/list.html) so that you can 
pass a binary function to map and refer to the index of the element in 
the body of the given function. It would be cool to be able to simply write:
	mapInd(lambda id,v:id*v,L)

2. Is there a higher order index function that lets you specify the 
condition to be met by the returned element. I mean something like:

def my_index(f,L,default):
     for x in L:
         if f(x):return x
     return default

Thanks in advance for your answer!

Cheers,
Luis


From ethan at stoneleaf.us  Sun Mar 28 09:46:36 2010
From: ethan at stoneleaf.us (Ethan Furman)
Date: Sun, 28 Mar 2010 06:46:36 -0700
Subject: Simple Traits Questions
In-Reply-To: <hom7jl$a75$1@dough.gmane.org>
References: <4BAE05C6.4070601@stoneleaf.us> <hom7jl$a75$1@dough.gmane.org>
Message-ID: <4BAF5DBC.7050909@stoneleaf.us>

Robert Kern wrote:
> On 2010-03-27 08:19 , Ethan Furman wrote:
> 
>> Okay, different post for my actual questions.  :)
>>
>> On the PyPI page for strait (http://pypi.python.org/pypi/strait/0.5.1)
>> it has the example of choosing which methods to keep in the composed 
>> class:
>>
>> class TOSWidget(BaseWidget):
>> __metaclass__ = include(Pack, Place, Grid)
>> info = Pack.info.im_func
>> config = Pack.config.im_func
>> configure = Pack.configure.im_func
>> slaves = Pack.slaves.im_func
>> forget = Pack.forget.im_func
>> propagate = Pack.propagate.im_func
>>
>> My question is:
>>
>> Why use
>>
>> info = Pack.info.im_func
>>
>> instead of
>>
>> info = Pack.info
>>
>> ?
> 
> 
> Pack.info is an unbound method object attached to the Pack class, not a 
> function object. It has some extra semantics on top of functions and is 
> tied to the Pack class. The .im_func attribute gets the actual function 
> object underneath. When defining the TOSWidget class, the objects 
> defined in the suite under the class: statement need to be actual 
> functions in order to be turned into unbound methods attached to the 
> TOSWidget class.

Ah, thank you.

In Python 3, though, would the Pack.info form be correct?

~Ethan~



From duncan.booth at invalid.invalid  Sun Mar 28 09:53:36 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 28 Mar 2010 13:53:36 GMT
Subject: map, index
References: <mOIrn.824$I8.247@news.indigo.ie>
Message-ID: <Xns9D499780917D2duncanbooth@127.0.0.1>

Luis Quesada <l.quesada at 4c.ucc.ie> wrote:

> Is there a way 
> of writing the following without using zip:
>      map(lambda (id,v):id*v,zip(range(len(L)),L))

[ id*v for id,v in enumerate(L) ]


From steve at holdenweb.com  Sun Mar 28 10:08:20 2010
From: steve at holdenweb.com (Steve Holden)
Date: Sun, 28 Mar 2010 10:08:20 -0400
Subject: Encryption source code with md5
In-Reply-To: <e8546002-d379-45fc-b834-753cdcccb91a@k13g2000yqe.googlegroups.com>
References: <91541c26-6f18-40c7-a0df-252a52bb7cd5@l25g2000yqd.googlegroups.com>	<hon9qm$8ei$2@lust.ihug.co.nz>	<4baf3ac4$0$22903$e4fe514c@news.xs4all.nl>
	<e8546002-d379-45fc-b834-753cdcccb91a@k13g2000yqe.googlegroups.com>
Message-ID: <honnsn$spu$1@dough.gmane.org>

catalinfest at gmail.com wrote:
> I had a talk about Python and distribution of commercial products
> created with python. This made me think of a way to protect my source
> code to be distributed. I thought a live CD version and then to an
> encryption method of a portion of source code. These thoughts are the
> source of two questions.

I'd suggest that you don't think about encrypting your source code until
you have a rather better handle on encryption technology. Your mention
of MD5, a hashing rather than an encryption algorithm, makes it clear
that you aren't familiar with the technologies at present.

There's nothing wrong with ignorance (I have a more than adequate supply
of my own), but in encryption it's *very* easy to make mistakes that
render whole systems vulnerable to trivial attack. So you do really need
to know what you are doing.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From showell30 at yahoo.com  Sun Mar 28 10:16:10 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Sun, 28 Mar 2010 07:16:10 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
Message-ID: <ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>

On Mar 27, 3:18?am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Fri, 26 Mar 2010 07:31:17 -0700, Steve Howell wrote:
> > From a purely academic standpoint, I'm not convinced that sum() is
> > inefficient in terms of big-O complexity, though.
>
> > ?showell at showell-laptop:~$ python
> > ?Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41) [GCC 4.3.3] on
> > ?linux2
> > ?>>> class StupidList:
>
> [...]
>
> But it's not *sum* that is inefficient, it is sum *with a particular data
> structure*.
>

Yep, the implied context was with particular data structures.

> Sure, if you create your own data structure, you can make it as efficient
> as you like. Obviously the sum algorithm itself has to perform one
> addition per item, or O(N), which scales tolerably well. But each
> addition has a cost. If the cost is constant, then sum() as a whole
> remains O(N). But if the cost of addition varies with N, sum() degrades
> ba
>

The surprising part of sum() is not that the outer loop to do the sums
is O(N).  It is hard to imagine any other implementation (without
parallelizing it).

The mildly surprising part of sum() is that is does add vs. add-in-
place, which leads to O(N) vs. O(1) for the inner loop calls, for
certain data structures, notably lists, even though none of the
intermediate results get used by the caller.  For lists, you could
make a more efficient variant of sum() that clones the start value and
does add-in-place.

I could guess pretty confidently that the reason this optimization was
never tried is that sum() has always been intended to be used on
numerics, since other alternatives exist for strings (join), lists
(chain), and hand-coded data classes that support add-in-place (roll-
your-own loop).

The documentation is pretty clear on the intention that sum() is
intended for numbers:

http://docs.python.org/library/functions.html#sum

Except for strings, the docs are not explicit about efficiency
concerns for other data structures, or the fact that the reference
implementation does add vs. add-in-place under the hood.




http://docs.python.org/library/functions.html#sum


From michele.simionato at gmail.com  Sun Mar 28 10:17:24 2010
From: michele.simionato at gmail.com (Michele Simionato)
Date: Sun, 28 Mar 2010 07:17:24 -0700 (PDT)
Subject: function decorator-like function
References: <9935ff3e-ff2f-44b8-83f4-60883b1512ac@k17g2000yqb.googlegroups.com>
	<90fe2ae8-cf1e-4d89-8b6d-2802874e64b5@e7g2000yqf.googlegroups.com> 
	<c32492f2-3c6c-48a1-9dd4-f7faeed21347@k17g2000yqb.googlegroups.com> 
	<b7dd0538-7300-476c-adfe-8b18b9f1bf9c@g4g2000yqa.googlegroups.com> 
	<40ba11d3-5a18-4da4-a48a-0dd815f3b459@35g2000yqm.googlegroups.com>
Message-ID: <1ea8ca8b-b556-44f1-9af8-75e1f60c5fb1@i25g2000yqm.googlegroups.com>

Another option is to use my own decorator module (http://
pypi.python.org/pypi/decorator):

from decorator import decorator

@decorator
def d(func, *args):
    print 3
    return func(*args)

@d
def f(a, b):
    print a + b

f(5, 7)




From l.quesada at 4c.ucc.ie  Sun Mar 28 10:34:12 2010
From: l.quesada at 4c.ucc.ie (Luis Quesada)
Date: Sun, 28 Mar 2010 15:34:12 +0100
Subject: map, index
In-Reply-To: <Xns9D499780917D2duncanbooth@127.0.0.1>
References: <mOIrn.824$I8.247@news.indigo.ie>
	<Xns9D499780917D2duncanbooth@127.0.0.1>
Message-ID: <CNJrn.825$I8.401@news.indigo.ie>

Duncan Booth wrote:
> Luis Quesada <l.quesada at 4c.ucc.ie> wrote:
> 
>> Is there a way 
>> of writing the following without using zip:
>>      map(lambda (id,v):id*v,zip(range(len(L)),L))
> 
> [ id*v for id,v in enumerate(L) ]
Cool! Thanks!
Cheers,
Luis


From v.harishankar at gmail.com  Sun Mar 28 10:39:12 2010
From: v.harishankar at gmail.com (Harishankar)
Date: Sun, 28 Mar 2010 14:39:12 +0000 (UTC)
Subject: Encryption source code with md5
References: <91541c26-6f18-40c7-a0df-252a52bb7cd5@l25g2000yqd.googlegroups.com>
	<hon9qm$8ei$2@lust.ihug.co.nz>
	<4baf3ac4$0$22903$e4fe514c@news.xs4all.nl>
	<e8546002-d379-45fc-b834-753cdcccb91a@k13g2000yqe.googlegroups.com>
	<mailman.1269.1269785330.23598.python-list@python.org>
Message-ID: <honpmg$718$1@news.telesweet.net>

On Sun, 28 Mar 2010 10:08:20 -0400, Steve Holden wrote:

> catalinfest at gmail.com wrote:
>> I had a talk about Python and distribution of commercial products
>> created with python. This made me think of a way to protect my source
>> code to be distributed. I thought a live CD version and then to an
>> encryption method of a portion of source code. These thoughts are the
>> source of two questions.
> 
> I'd suggest that you don't think about encrypting your source code until
> you have a rather better handle on encryption technology. Your mention
> of MD5, a hashing rather than an encryption algorithm, makes it clear
> that you aren't familiar with the technologies at present.
> 
> There's nothing wrong with ignorance (I have a more than adequate supply
> of my own), but in encryption it's *very* easy to make mistakes that
> render whole systems vulnerable to trivial attack. So you do really need
> to know what you are doing.
> 
> regards
>  Steve

This article offers some good ideas and also sums up some good points 
*against* code obfuscation.

http://stackoverflow.com/questions/261638/how-do-i-protect-python-code

Read it and judge whether the benefits of not obfuscating code outweighs 
the advantages of obfuscating it.





-- 
Harishankar (http://harishankar.org http://literaryforums.org)


From steve at REMOVE-THIS-cybersource.com.au  Sun Mar 28 10:57:08 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 28 Mar 2010 14:57:08 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
Message-ID: <4baf6e43$0$8756$c3e8da3@news.astraweb.com>

On Sun, 28 Mar 2010 07:16:10 -0700, Steve Howell wrote:

> The mildly surprising part of sum() is that is does add vs. add-in-
> place, which leads to O(N) vs. O(1) for the inner loop calls, for
> certain data structures, notably lists, even though none of the
> intermediate results get used by the caller.  For lists, you could make
> a more efficient variant of sum() that clones the start value and does
> add-in-place.

I have no doubt that you could make a version of sum for lists which is 
more efficient than the existing one. After all, join more or less does 
the same sort of thing, and it's very efficient. But don't think that add-
in-place is necessarily cheap. List appends are amortized O(1) each; if 
you are adding M lists of N items each, that gives you O(M*N).

It's possible to improve the performance a tad if you can make multiple 
appends in roughly constant time, which is what list.extend (probably?) 
does, but only up to a point. Lists are over-allocated, but if you try to 
add more items than there is room for, you need to make the list bigger, 
and that means reallocating memory, which could easily be O(N**2) or 
worse, depending on how good your OS's memory management is. Under Linux, 
at least by default, malloc will never fail, but there's no guarantee how 
long it will take to return. If the OOM killer has to start shutting down 
other applications, and paging more and more memory to disk, eventually 
malloc will return (or the system will core dump), but it could take a 
while...



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sun Mar 28 10:58:18 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 28 Mar 2010 14:58:18 GMT
Subject: Encryption source code with md5
References: <91541c26-6f18-40c7-a0df-252a52bb7cd5@l25g2000yqd.googlegroups.com>
	<hon9qm$8ei$2@lust.ihug.co.nz>
	<4baf3ac4$0$22903$e4fe514c@news.xs4all.nl>
	<e8546002-d379-45fc-b834-753cdcccb91a@k13g2000yqe.googlegroups.com>
	<mailman.1269.1269785330.23598.python-list@python.org>
Message-ID: <4baf6e8a$0$8756$c3e8da3@news.astraweb.com>

On Sun, 28 Mar 2010 10:08:20 -0400, Steve Holden wrote:

> catalinfest at gmail.com wrote:
>> I had a talk about Python and distribution of commercial products
>> created with python. This made me think of a way to protect my source
>> code to be distributed. I thought a live CD version and then to an
>> encryption method of a portion of source code. These thoughts are the
>> source of two questions.
> 
> I'd suggest that you don't think about encrypting your source code until
> you have a rather better handle on encryption technology. Your mention
> of MD5, a hashing rather than an encryption algorithm, makes it clear
> that you aren't familiar with the technologies at present.

Furthermore, you should forget about encrypting your program until you 
are sure that it is something that needs encrypting. In my experience, 
most times newbies start waffling on about encrypting their precious code 
(usually displaying total confusion about encryption technology), it 
turns out their critical application is something like Notepad only with 
fewer features.

Not that I'm jaded at all.



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Sun Mar 28 10:59:18 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 28 Mar 2010 14:59:18 GMT
Subject: StringChain -- a data structure for managing large sequences of
	chunks of bytes
References: <mailman.646.1268377905.23598.python-list@python.org>
	<4b9a00ce$0$27822$c3e8da3@news.astraweb.com>
	<mailman.1055.1269234593.23598.python-list@python.org>
	<pan.2010.03.22.08.07.48@REMOVE.THIS.cybersource.com.au>
	<4bae6130$1@dnews.tpgi.com.au>
Message-ID: <4baf6ec6$0$8756$c3e8da3@news.astraweb.com>

On Sun, 28 Mar 2010 06:48:21 +1100, Lie Ryan wrote:

> On 03/22/2010 07:07 PM, Steven D'Aprano wrote:
>> Perhaps you should have said that it was a wrapper around deque giving
>> richer functionality, rather than giving the impression that it was a
>> brand new data structure invented by you. People are naturally going to
>> be more skeptical about a newly invented data structure than one based
>> on a reliable, component like deque.
> 
> Well, technically StringChain is not a data structure in the first
> place. StringChain is a string;

And strings are data structures, as are arrays and structs. Just because 
they're simple data structures made directly from primitives rather than 
rich, complex structures, doesn't mean they're not data structures.


> a string that is implemented using deque
> data structure to make appending algorithmically efficient. It is not a
> data structure, in the sense that I can't put arbitrary "thing" into the
> data structure. 

Any "thing" that can be pickled or serialised can be put into a string.



-- 
Steven


From duncan.booth at invalid.invalid  Sun Mar 28 11:17:46 2010
From: duncan.booth at invalid.invalid (Duncan Booth)
Date: 28 Mar 2010 15:17:46 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
Message-ID: <Xns9D49A5BF95C33duncanbooth@127.0.0.1>

Steve Howell <showell30 at yahoo.com> wrote:

> The mildly surprising part of sum() is that is does add vs. add-in-
> place, which leads to O(N) vs. O(1) for the inner loop calls, for
> certain data structures, notably lists, even though none of the
> intermediate results get used by the caller.  For lists, you could
> make a more efficient variant of sum() that clones the start value and
> does add-in-place.

Doing add-in-place isn't the only way to make sum more efficient: if you 
assume that addition is associative (which of course the builtin sum can't) 
then you can form partial sums. e.g. instead of calculating:

  (((((((a + b) + c) + d) + e) + f) + g) + h)

you calculate:

  (((a + b) + (c + d)) + ((e + f) + (g + h)))

Obviously this requires more space than the naive sum, but not as much as 
you might at first expect: you only need to hold log(n) intermediates 
values at any time.

> I could guess pretty confidently that the reason this optimization was
> never tried is that sum() has always been intended to be used on
> numerics, since other alternatives exist for strings (join), lists
> (chain), and hand-coded data classes that support add-in-place (roll-
> your-own loop).

Doing it this way helps summing lists or strings (though not as much as 
str.join), but it also helps if you need to sum a long list of similarly 
sized floats as you'll get a more accurate answer.

See 
http://groups.google.com/group/comp.lang.python/browse_thread/thread/9eda29
faf92f532e/027cef7d4429aa3a
for an earlier discussion of this, or just Google comp.lang.python for 
'pairwise sum'.

Here's the code I posted in that thread:

def sumpairs(seq): 
    tmp = [] 
    for i,v in enumerate(seq): 
        if i&1: 
            tmp[-1] = tmp[-1] + v 
            i = i + 1 
            n = i & -i 
            while n > 2: 
                t = tmp.pop(-1) 
                tmp[-1] = tmp[-1] + t 
                n >>= 1 
        else: 
            tmp.append(v) 
    while len(tmp) > 1: 
        t = tmp.pop(-1) 
        tmp[-1] = tmp[-1] + t 
    return tmp[0] 

and I claimed that my Python coded sumpairs function was faster than the 
builtin sum on a list of lists once you had more than about 210 items.
I never did get round to rewriting it in C for a more realistic speed 
comparison: summing integers my Python version is about 60 times slower 
than the builtin.


From showell30 at yahoo.com  Sun Mar 28 11:55:05 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Sun, 28 Mar 2010 08:55:05 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
Message-ID: <94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>

On Mar 28, 8:17?am, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
> Steve Howell <showel... at yahoo.com> wrote:
> > The mildly surprising part of sum() is that is does add vs. add-in-
> > place, which leads to O(N) vs. O(1) for the inner loop calls, for
> > certain data structures, notably lists, even though none of the
> > intermediate results get used by the caller. ?For lists, you could
> > make a more efficient variant of sum() that clones the start value and
> > does add-in-place.
>
> Doing add-in-place isn't the only way to make sum more efficient: if you
> assume that addition is associative (which of course the builtin sum can't)
> then you can form partial sums. e.g. instead of calculating:
>
> ? (((((((a + b) + c) + d) + e) + f) + g) + h)
>
> you calculate:
>
> ? (((a + b) + (c + d)) + ((e + f) + (g + h)))
>
> Obviously this requires more space than the naive sum, but not as much as
> you might at first expect: you only need to hold log(n) intermediates
> values at any time.
>

Yep, I did mention in my post that the outer loop does not *have* to
be O(N), if you can parallelize it.  Apart from reducing
intermediates, the divide-and-conquer method does not reduce overall
computation time unless you have multiple processors, correct?

> > I could guess pretty confidently that the reason this optimization was
> > never tried is that sum() has always been intended to be used on
> > numerics, since other alternatives exist for strings (join), lists
> > (chain), and hand-coded data classes that support add-in-place (roll-
> > your-own loop).
>
> Doing it this way helps summing lists or strings (though not as much as
> str.join), but it also helps if you need to sum a long list of similarly
> sized floats as you'll get a more accurate answer.
>

Interesting!  That makes sense.  The docs for math.fsum() suggest that
partial sums are used to maintain precision.

http://docs.python.org/library/math.html#math.fsum

> Seehttp://groups.google.com/group/comp.lang.python/browse_thread/thread/...
> faf92f532e/027cef7d4429aa3a
> for an earlier discussion of this, or just Google comp.lang.python for
> 'pairwise sum'.
>
> Here's the code I posted in that thread:
>
> def sumpairs(seq):
> ? ? tmp = []
> ? ? for i,v in enumerate(seq):
> ? ? ? ? if i&1:
> ? ? ? ? ? ? tmp[-1] = tmp[-1] + v
> ? ? ? ? ? ? i = i + 1
> ? ? ? ? ? ? n = i & -i
> ? ? ? ? ? ? while n > 2:
> ? ? ? ? ? ? ? ? t = tmp.pop(-1)
> ? ? ? ? ? ? ? ? tmp[-1] = tmp[-1] + t
> ? ? ? ? ? ? ? ? n >>= 1
> ? ? ? ? else:
> ? ? ? ? ? ? tmp.append(v)
> ? ? while len(tmp) > 1:
> ? ? ? ? t = tmp.pop(-1)
> ? ? ? ? tmp[-1] = tmp[-1] + t
> ? ? return tmp[0]
>
> and I claimed that my Python coded sumpairs function was faster than the
> builtin sum on a list of lists once you had more than about 210 items.
> I never did get round to rewriting it in C for a more realistic speed
> comparison: summing integers my Python version is about 60 times slower
> than the builtin.



From wolftracks at invalid.com  Sun Mar 28 12:20:21 2010
From: wolftracks at invalid.com (W. eWatson)
Date: Sun, 28 Mar 2010 09:20:21 -0700
Subject: Why this Difference in Importing NumPy 1.2 vs 1.4?
Message-ID: <honvk7$thl$1@news.eternal-september.org>

I wrote a program in Python 2.5 under Win7 and it runs fine using Numpy 
1.2 , but not on a colleague's machine who has a slightly newer 2.5 and 
uses NumPy 1.4. We both use IDLE to execute the program. During import 
he gets this:

 >>>
Traceback (most recent call last):
   File "C:\Documents and Settings\HP_Administrator.DavesDesktop\My 
Documents\Astro\Meteors\NC-FireballReport.py", line 38, in <module>
     from scipy import stats as stats # scoreatpercentile
   File "C:\Python25\lib\site-packages\scipy\stats\__init__.py", line 7, 
in <module>
     from stats import *
   File "C:\Python25\lib\site-packages\scipy\stats\stats.py", line 191, 
in <module>
     import scipy.special as special
   File "C:\Python25\lib\site-packages\scipy\special\__init__.py", line 
22, in <module>
     from numpy.testing import NumpyTest
ImportError: cannot import name NumpyTest
 >>>

Comments?

It looks as though the problem is in NumPy 1.4. If it's either in NumPy 
or SciPy, how does my colleague back out to an earlier version to agree 
with mine? Does he just pull down 1.3 or better 1.2 (I use it.), and 
install it? How does he somehow remove 1.4? Is it as easy as going to 
IDLE's path browser and removing, under site-packages, numpy? (I'm not 
sure that's even possible. I don't see a right-click menu.)


From showell30 at yahoo.com  Sun Mar 28 12:21:59 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Sun, 28 Mar 2010 09:21:59 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<4baf6e43$0$8756$c3e8da3@news.astraweb.com>
Message-ID: <2af1fb7c-5952-484b-af2a-95ea97b47994@x11g2000prb.googlegroups.com>

On Mar 28, 7:57?am, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Sun, 28 Mar 2010 07:16:10 -0700, Steve Howell wrote:
> > The mildly surprising part of sum() is that is does add vs. add-in-
> > place, which leads to O(N) vs. O(1) for the inner loop calls, for
> > certain data structures, notably lists, even though none of the
> > intermediate results get used by the caller. ?For lists, you could make
> > a more efficient variant of sum() that clones the start value and does
> > add-in-place.
>
> I have no doubt that you could make a version of sum for lists which is
> more efficient than the existing one. After all, join more or less does
> the same sort of thing, and it's very efficient. But don't think that add-
> in-place is necessarily cheap. List appends are amortized O(1) each; if
> you are adding M lists of N items each, that gives you O(M*N).
>

O(M*N) is still cheaper than O(M*N*N).

> It's possible to improve the performance a tad if you can make multiple
> appends in roughly constant time, which is what list.extend (probably?)
> does, but only up to a point. Lists are over-allocated, but if you try to
> add more items than there is room for, you need to make the list bigger,
> and that means reallocating memory, which could easily be O(N**2) or
> worse, depending on how good your OS's memory management is. Under Linux,
> at least by default, malloc will never fail, but there's no guarantee how
> long it will take to return. If the OOM killer has to start shutting down
> other applications, and paging more and more memory to disk, eventually
> malloc will return (or the system will core dump), but it could take a
> while...
>

Even though extend() obviously has to do memory allocations along the
way itself, it is still more efficient than the alternative.  No need
to speculate, you can measure these methods on your platform:

    M = 10
    N = 1000

    def in_place(
        start = [],
        sublists = ([[None] * M]) * N
        ):
        accum = start[:]
        for sublist in sublists:
            accum.extend(sublist)
        return accum

    def with_intermediates(
        start = [],
        sublists = ([[None] * M]) * N
        ):
        accum = start
        for sublist in sublists:
            accum = accum + sublist
        return accum


From fhernandezn at gmail.com  Sun Mar 28 12:22:23 2010
From: fhernandezn at gmail.com (Fabian Hernandez)
Date: Sun, 28 Mar 2010 12:22:23 -0400
Subject: [Off Topic] Tech Adviser Wanted by Unusual Social Venture Startup
	AND WEBEX QUESTION
In-Reply-To: <a4798b061003270929m5ef1da0bh540a9a968c4d1e87@mail.gmail.com>
References: <a4798b061003270929m5ef1da0bh540a9a968c4d1e87@mail.gmail.com>
Message-ID: <3be2e7f21003280922t1f248ae6pb68e37caf048dded@mail.gmail.com>

2010/3/27 G.Lowell Krane <ecouplecoach at gmail.com>

> Here is the ad i am trying to get Python-list to post ASAP--this weekend.
>
> Also, in case one of your best applications is not public, and you want to
> demonstrate it, do you prefer webex or what do you prefer?
> --gary
>
> ---------- Forwarded message ----------
> From: G.Lowell Krane <ecouplecoach at gmail.com>
> Date: Fri, Mar 26, 2010 at 4:26 PM
> Subject: [Off Topic] Tech Adviser Wanted by Unusual Social Venture Startup
> To: python-list at python.org
>
>
> TECH ADVISOR (1-3 hrs/wk) WANTED FOR UNUSUAL SOCIAL VENTURE STARTUP
>
>
> This position is for an unusual well advanced (though not yet in beta)
> Social Venture Internet Startup that has hopefully figured out a way  through
> an unusually  robust web application to help the 95% of unhappy couples in
> the Western Hemisphere who cannot afford or will not trust a marriage
> therapist,  to save, ensure, deepen their relationships (about 60MM
> couples!). The monetization model is initially subscriber (very low fee that
> mkt research (harris poll) has shown the majority of these in USA, at least
> would like to use this for about $20/mo for at least 3 mo or longer as long
> as they felt it was helping at least a little.) Our startup, eCoupleCoach
> /ParejasContentas, would in fact be the pioneer of this blue ocean market
> using a conceptual advance, and employing a social media as well as "tapping
> the wisdom of the best experts" model.
>
>
> Our urgent need now is for someone who is a senior level
> developer/programmer to be able to vet three or four of the best  web
> application teams we have finally found, or at least the one python team we
> found (in Bogota, where I, the ceo/founder/head research psychologist, will
> be working with them daily to ensure  maximum efficiency).**
>
> *BTW, anyone who has gone through a tough divorce (or whose parents
> divorced at a tender age, will probably find this enormously fascinating and
> gratifying?an opportunity to turn your lemons into lemonade.*
>
> Besides the python freelance team ( team, we also have a .net  freelance
> team, and  php company . We might identify a 4th soon.  But the priority
> now is to vet the python team?one lead developer who has been doing python
> on and off (part and fulltime )for several years (but collapsed, 3 years),
> and the other developer, about 1 year. The third member of their team is
> more of a designer, doing css and html.
>
> After this vetting, we ideally hope, if you are excited about our potential
> and yours with us, that you will want to stay on  up to two hours a week (of
> course the more you can devote the better if you are interested in any other
> challenges) to at least  QA the code quality and make sure it is being
> dumped at least weekly.
>
> WHAT WE HAVE GOING FOR US: A lot. Once we hear from you, we will send
> detailed backgrounders.
>
> COMPENSATION: would be negotiable and this could also lead to a highly
> responsible high up position once we are funded.
>
> TO APPLY: PLEASE email me at eCoupleCoach at gmail.com to make initial
> contact, and send us your resume. After this we will
> Send you detailed backgrounders on who we are and what we have going for
> us.
>
> IN YOUR SIGNATURE (so easy to find): Please also indicate your skype
> contact info, for follow up phone conversation, unless you prefer chat, in
> which case your chat contact info (preferably google), since I am in
> Colombia now and will be till the beta is done, though my partner and VP of
> Product Development/Project Manager is in NYC.
>
>
>
>
>
>
> Gary Krane PhD, CEO/founder Relationship Technologies (ParejasContentas y
> eCoupleCoach)
> "Tapping the wisdom of the best experts and the wisest couples (TM)," and
> "Making Honesty easier than ever before."
> Medellin and Bogota: 300 415 5298
> Skype: garykrane
>
> "The greatness of a human is to be measured exactly by the degree to which
> he has helped his/her fellow human."-Gandhi
> "The best things in life are not things" (anon)
>
>
>
>
> --
> Attentamente,
> Gary Krane PhD, CEO/founder Relationship Technologies (ParejasContentas y
> eCoupleCoach)
> "Tapping the wisdom of the best experts and the wisest couples (TM)," and
> "Making Honesty easier than ever before."
> Medellin: 300 415 5298
> Skype: garykrane
>
> "Un ser humano se convierte en una gran exactitud en la medida en la que ?l
> trabaja para el bienestar de sus compa?eros " - Mahatma Gandhi
> "The greatness of a human is to be measured exactly by the degree to which
> he has helped his/her fellow human."-Gandhi
> "The best things in life are not things" (anon)
>
>


-- 
Fabian Hernandez Nieto
http://www.sidesoftware.net
Linux User # 485518
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From pmaupin at gmail.com  Sun Mar 28 12:26:39 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sun, 28 Mar 2010 09:26:39 -0700 (PDT)
Subject: function decorator-like function
References: <9935ff3e-ff2f-44b8-83f4-60883b1512ac@k17g2000yqb.googlegroups.com>
	<90fe2ae8-cf1e-4d89-8b6d-2802874e64b5@e7g2000yqf.googlegroups.com> 
	<c32492f2-3c6c-48a1-9dd4-f7faeed21347@k17g2000yqb.googlegroups.com> 
	<b7dd0538-7300-476c-adfe-8b18b9f1bf9c@g4g2000yqa.googlegroups.com> 
	<40ba11d3-5a18-4da4-a48a-0dd815f3b459@35g2000yqm.googlegroups.com> 
	<1ea8ca8b-b556-44f1-9af8-75e1f60c5fb1@i25g2000yqm.googlegroups.com>
Message-ID: <ed053064-0c6f-4a02-b89d-97f68d7a43ce@d27g2000yqf.googlegroups.com>

On Mar 28, 9:17?am, Michele Simionato <michele.simion... at gmail.com>
wrote:
> Another option is to use my own decorator module (http://
> pypi.python.org/pypi/decorator):
>
> from decorator import decorator
>
> @decorator
> def d(func, *args):
> ? ? print 3
> ? ? return func(*args)
>
> @d
> def f(a, b):
> ? ? print a + b
>
> f(5, 7)

That looks cool (and I'm glad you mentioned it), but it appeared to me
the OP was trying to manually construct the equivalent of a decorator
without the "@" syntax, in order to gain an understanding of how
decorators work, and for this particular purpose, piling additional
magic on top of decorators is probably not helpful :-)

Regards,
Pat


From fhernandezn at gmail.com  Sun Mar 28 12:44:56 2010
From: fhernandezn at gmail.com (Fabian Hernandez)
Date: Sun, 28 Mar 2010 12:44:56 -0400
Subject: OT: Tech Adviser Wanted by Unusual Social Venture Startup AND WEBEX 
	QUESTION
Message-ID: <3be2e7f21003280944i49f4e1a2g6dd199be2e1b3018@mail.gmail.com>

---------- Forwarded message ----------
From: G.Lowell Krane <ecouplecoach at gmail.com>
Date: 2010/3/27
Subject: Fwd: [Off Topic] Tech Adviser Wanted by Unusual Social Venture
Startup AND WEBEX QUESTION
To: Daniel Arbelaez <darbelaez at pragma.com.co>
Cc: arpunk <arpunk at cyberdelic.org>, Fabian Hernandez <fhernandezn at gmail.com>


Here is the ad i am trying to get Python-list to post ASAP--this weekend.

Also, in case one of your best applications is not public, and you want to
demonstrate it, do you prefer webex or what do you prefer?
--gary

---------- Forwarded message ----------
From: G.Lowell Krane <ecouplecoach at gmail.com>
Date: Fri, Mar 26, 2010 at 4:26 PM
Subject: [Off Topic] Tech Adviser Wanted by Unusual Social Venture Startup
To: python-list at python.org


TECH ADVISOR (1-3 hrs/wk) WANTED FOR UNUSUAL SOCIAL VENTURE STARTUP


This position is for an unusual well advanced (though not yet in beta)
Social Venture Internet Startup that has hopefully figured out a way  through
an unusually  robust web application to help the 95% of unhappy couples in
the Western Hemisphere who cannot afford or will not trust a marriage
therapist,  to save, ensure, deepen their relationships (about 60MM
couples!). The monetization model is initially subscriber (very low fee that
mkt research (harris poll) has shown the majority of these in USA, at least
would like to use this for about $20/mo for at least 3 mo or longer as long
as they felt it was helping at least a little.) Our startup, eCoupleCoach
/ParejasContentas, would in fact be the pioneer of this blue ocean market
using a conceptual advance, and employing a social media as well as "tapping
the wisdom of the best experts" model.


Our urgent need now is for someone who is a senior level
developer/programmer to be able to vet three or four of the best  web
application teams we have finally found, or at least the one python team we
found (in Bogota, where I, the ceo/founder/head research psychologist, will
be working with them daily to ensure  maximum efficiency).**

*BTW, anyone who has gone through a tough divorce (or whose parents divorced
at a tender age, will probably find this enormously fascinating and
gratifying?an opportunity to turn your lemons into lemonade.*

Besides the python freelance team ( team, we also have a .net  freelance
team, and  php company . We might identify a 4th soon.  But the priority now
is to vet the python team?one lead developer who has been doing python on
and off (part and fulltime )for several years (but collapsed, 3 years), and
the other developer, about 1 year. The third member of their team is more of
a designer, doing css and html.

After this vetting, we ideally hope, if you are excited about our potential
and yours with us, that you will want to stay on  up to two hours a week (of
course the more you can devote the better if you are interested in any other
challenges) to at least  QA the code quality and make sure it is being
dumped at least weekly.

WHAT WE HAVE GOING FOR US: A lot. Once we hear from you, we will send
detailed backgrounders.

COMPENSATION: would be negotiable and this could also lead to a highly
responsible high up position once we are funded.

TO APPLY: PLEASE email me at eCoupleCoach at gmail.com to make initial contact,
and send us your resume. After this we will
Send you detailed backgrounders on who we are and what we have going for us.

IN YOUR SIGNATURE (so easy to find): Please also indicate your skype contact
info, for follow up phone conversation, unless you prefer chat, in which
case your chat contact info (preferably google), since I am in Colombia now
and will be till the beta is done, though my partner and VP of Product
Development/Project Manager is in NYC.






Gary Krane PhD, CEO/founder Relationship Technologies (ParejasContentas y
eCoupleCoach)
"Tapping the wisdom of the best experts and the wisest couples (TM)," and
"Making Honesty easier than ever before."
Medellin and Bogota: 300 415 5298
Skype: garykrane

"The greatness of a human is to be measured exactly by the degree to which
he has helped his/her fellow human."-Gandhi
"The best things in life are not things" (anon)




-- 
Attentamente,
Gary Krane PhD, CEO/founder Relationship Technologies (ParejasContentas y
eCoupleCoach)
"Tapping the wisdom of the best experts and the wisest couples (TM)," and
"Making Honesty easier than ever before."
Medellin: 300 415 5298
Skype: garykrane

"Un ser humano se convierte en una gran exactitud en la medida en la que ?l
trabaja para el bienestar de sus compa?eros " - Mahatma Gandhi
"The greatness of a human is to be measured exactly by the degree to which
he has helped his/her fellow human."-Gandhi
"The best things in life are not things" (anon)




-- 
Fabian Hernandez Nieto
http://www.sidesoftware.net
Linux User # 485518
-------------- next part --------------
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From pmaupin at gmail.com  Sun Mar 28 12:46:07 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sun, 28 Mar 2010 09:46:07 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
Message-ID: <2eb7e099-6ad5-46f0-abe3-4599231f70f5@z4g2000yqa.googlegroups.com>

On Mar 28, 10:17?am, Duncan Booth <duncan.bo... at invalid.invalid>
wrote:
> Doing add-in-place isn't the only way to make sum more efficient: if you
> assume that addition is associative (which of course the builtin sum can't)
> then you can form partial sums. e.g. instead of calculating:
...
>
> Doing it this way helps summing lists or strings (though not as much as
> str.join), but it also helps if you need to sum a long list of similarly
> sized floats as you'll get a more accurate answer.

Also, partial sums would be a clear winner over add-in-place if
someone were dumb^H^H^H^Hnaive enough to use sum() on a long list of
tuples :-)


From alfps at start.no  Sun Mar 28 12:56:26 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Sun, 28 Mar 2010 18:56:26 +0200
Subject: sum for sequences?
In-Reply-To: <94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
Message-ID: <hoo1k4$cia$1@news.eternal-september.org>

* Steve Howell:
> On Mar 28, 8:17 am, Duncan Booth <duncan.bo... at invalid.invalid> wrote:
>> Steve Howell <showel... at yahoo.com> wrote:
>>> The mildly surprising part of sum() is that is does add vs. add-in-
>>> place, which leads to O(N) vs. O(1) for the inner loop calls, for
>>> certain data structures, notably lists, even though none of the
>>> intermediate results get used by the caller.  For lists, you could
>>> make a more efficient variant of sum() that clones the start value and
>>> does add-in-place.
>> Doing add-in-place isn't the only way to make sum more efficient: if you
>> assume that addition is associative (which of course the builtin sum can't)
>> then you can form partial sums. e.g. instead of calculating:
>>
>>   (((((((a + b) + c) + d) + e) + f) + g) + h)
>>
>> you calculate:
>>
>>   (((a + b) + (c + d)) + ((e + f) + (g + h)))
>>
>> Obviously this requires more space than the naive sum, but not as much as
>> you might at first expect: you only need to hold log(n) intermediates
>> values at any time.
>>
> 
> Yep, I did mention in my post that the outer loop does not *have* to
> be O(N), if you can parallelize it.  Apart from reducing
> intermediates, the divide-and-conquer method does not reduce overall
> computation time unless you have multiple processors, correct?
> 

With a single thread of execution it can reduce the time for large integers and 
custom numerical types, with n the number of final bits, from O(n^2) to O(n log n).

I don't think the parallelism here is very relevant for Python.

 From a more practical point of view, the sum efficiency could be improved by 
doing the first addition using '+' and the rest using '+=', without changing the 
behavior.


Cheers & hth.,

- Alf


From showell30 at yahoo.com  Sun Mar 28 13:21:08 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Sun, 28 Mar 2010 10:21:08 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
Message-ID: <88a43c1d-6529-41ea-bdea-21d49d6e2616@v34g2000prd.googlegroups.com>

On Mar 28, 9:56?am, "Alf P. Steinbach" <al... at start.no> wrote:
> * Steve Howell:
>> (talking about summing a list of lists)
>
> ?From a more practical point of view, the sum efficiency could be improved by
> doing the first addition using '+' and the rest using '+=', without changing the
> behavior.

I like that approach, because you don't have to assume that the start
object is clonable, although perhaps you need to make that assumption
anyway for the case where the list is empty.

Here is code that might shed light on Alf's suggested approach:

    import timeit
    M = 10
    N = 8000

    def in_place(
        start = [],
        sublists = ([[None] * M]) * N
        ):
        # only macro-optimized
        i = 0
        for sublist in sublists:
            if i == 0:
               accum = start + sublist
               i += 1
            else:
                accum.extend(sublist)
        if i == 0:
            return 'whatever' # semantics here?
        return accum

    def with_intermediates(
        start = [],
        sublists = ([[None] * M]) * N
        ):
        accum = start
        for sublist in sublists:
            accum = accum + sublist
        return accum

    t1 = timeit.timeit('in_place()', 'from __main__ import in_place',
number=10)
    t2 = timeit.timeit('with_intermediates()', 'from __main__ import
with_intermediates', number=10)
    print M, N, t1, t2, int(t2 / t1)

For N=100, you get a significant speedup (x84):

 10 1000 0.00102496147156 0.0867249965668 84

More data:

 10 1000 0.00102496147156 0.0867249965668 84
 10 2000 0.00211381912231 0.172616004944 81
 10 4000 0.00491786003113 0.561800956726 114
 10 8000 0.0706541538239 19.9019489288 281
 10 16000 0.0161759853363 9.64171791077 596
 10 32000 0.0351569652557 43.98346591 1251



From pmaupin at gmail.com  Sun Mar 28 13:27:38 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sun, 28 Mar 2010 10:27:38 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
Message-ID: <a8c7ba74-1060-445f-9f3d-0cfcf247fd30@q21g2000yqm.googlegroups.com>

On Mar 28, 11:56?am, "Alf P. Steinbach" <al... at start.no> wrote:
> ?From a more practical point of view, the sum efficiency could be improved by
> doing the first addition using '+' and the rest using '+=', without changing the
> behavior.

Mod parent up!!!! :-)


From showell30 at yahoo.com  Sun Mar 28 13:34:13 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Sun, 28 Mar 2010 10:34:13 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<88a43c1d-6529-41ea-bdea-21d49d6e2616@v34g2000prd.googlegroups.com>
Message-ID: <0c76b611-c54f-4474-8f45-d745c53f72d0@k5g2000prg.googlegroups.com>

On Mar 28, 10:21?am, Steve Howell <showel... at yahoo.com> wrote:
> ? ? import timeit
> ? ? M = 10
> ? ? N = 8000
>
> ? ? def in_place(
> ? ? ? ? start = [],
> ? ? ? ? sublists = ([[None] * M]) * N
> ? ? ? ? ):
> ? ? ? ? # only macro-optimized
> ? ? ? ? i = 0
> ? ? ? ? for sublist in sublists:
> ? ? ? ? ? ? if i == 0:
> ? ? ? ? ? ? ? ?accum = start + sublist
> ? ? ? ? ? ? ? ?i += 1
> ? ? ? ? ? ? else:
> ? ? ? ? ? ? ? ? accum.extend(sublist)

FYI I later obtained similar results with the more general:
                  accum += sublist

> ? ? ? ? if i == 0:
> ? ? ? ? ? ? return 'whatever' # semantics here?
> ? ? ? ? return accum
>
> ? ? def with_intermediates(
> ? ? ? ? start = [],
> ? ? ? ? sublists = ([[None] * M]) * N
> ? ? ? ? ):
> ? ? ? ? accum = start
> ? ? ? ? for sublist in sublists:
> ? ? ? ? ? ? accum = accum + sublist
> ? ? ? ? return accum
>


From pmaupin at gmail.com  Sun Mar 28 14:16:25 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Sun, 28 Mar 2010 11:16:25 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<88a43c1d-6529-41ea-bdea-21d49d6e2616@v34g2000prd.googlegroups.com>
	<0c76b611-c54f-4474-8f45-d745c53f72d0@k5g2000prg.googlegroups.com>
Message-ID: <56cb099a-7757-481e-a316-f9655c3ac03c@k13g2000yqe.googlegroups.com>

On Mar 28, 12:34?pm, Steve Howell <showel... at yahoo.com> wrote:
> FYI I later obtained similar results with the more general:
> ? ? ? ? ? ? ? ? ? accum += sublist

Yeah, but you still have to create an object of the correct type for
accum.  And for summing small lists, that will actually increase the
runtime.  (Worst case, a list of a single item: you have to create the
accum object based on the type of the start value, then do two += into
it, for the start value and the first item in the list, vs just doing
a single + which automatically creates an object.)

Personally, I think the most general approach, if sum were open to
enhancements, would be to automatically apply Alf's suggestion of "+"
on summing the first item to the start value, and "+=" on subsequent
items.  Also, you *could* add a parameter to sum(), for example,
default "partialsums=False" that would allow the use of partial sums
in those cases where that might give better behavior (such as floats
and tuples).



From showell30 at yahoo.com  Sun Mar 28 14:50:09 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Sun, 28 Mar 2010 11:50:09 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<88a43c1d-6529-41ea-bdea-21d49d6e2616@v34g2000prd.googlegroups.com>
	<0c76b611-c54f-4474-8f45-d745c53f72d0@k5g2000prg.googlegroups.com> 
	<56cb099a-7757-481e-a316-f9655c3ac03c@k13g2000yqe.googlegroups.com>
Message-ID: <975c7b4e-6c30-40b7-a4da-bcbbeb13e1aa@l5g2000pri.googlegroups.com>

On Mar 28, 11:16?am, Patrick Maupin <pmau... at gmail.com> wrote:
> On Mar 28, 12:34?pm, Steve Howell <showel... at yahoo.com> wrote:
>
> > FYI I later obtained similar results with the more general:
> > ? ? ? ? ? ? ? ? ? accum += sublist
>
> Yeah, but you still have to create an object of the correct type for
> accum. ?

I think you overlooked the surrounding code.

Here is the code again:

    def in_place(
        start = [],
        sublists = ([[None] * M]) * N
        ):
        # only macro-optimized
        i = 0
        for sublist in sublists:
            if i == 0:
               accum = start + sublist
               i += 1
            else:
                accum += sublist
        if i == 0:
            return 'whatever' # semantics here?
        return accum

No need to infer the type.

> And for summing small lists, that will actually increase the
> runtime. ?(Worst case, a list of a single item: you have to create the
> accum object based on the type of the start value, then do two += into
> it, for the start value and the first item in the list, vs just doing
> a single + which automatically creates an object.)
>

For small lists, the performance of any sane implementation would
probably be so fast as to be negligible, unless you are in a really
tight loop.  If you are in a tight loop, then your use case probably
eventually sums large lists.  Even if it doesn't, the slowdown is just
a constant.

For M=5, I get these results on my machine:

M N t1 t2 (t2/t1)
5 1 3.50475311279e-05 3.2901763916e-05 0.938775510204
5 2 2.00271606445e-05 1.59740447998e-05 0.797619047619
5 4 6.79492950439e-05 6.31809234619e-05 0.929824561404
5 8 0.000124931335449 0.000126123428345 1.00954198473
5 64 0.000530958175659 0.00226187705994 4.25999101931
5 1024 0.00262904167175 0.27246594429 103.636981953

t1 = time with add only first element
t2 = time with add all elements

Very small penalty for small lists, very large gain for large lists.

> Personally, I think the most general approach, if sum were open to
> enhancements, would be to automatically apply Alf's suggestion of "+"
> on summing the first item to the start value, and "+=" on subsequent
> items. ?

See above.  That's the approach I would use as well.



From robert.kern at gmail.com  Sun Mar 28 15:03:49 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Sun, 28 Mar 2010 14:03:49 -0500
Subject: Simple Traits Questions
In-Reply-To: <4BAF5DBC.7050909@stoneleaf.us>
References: <4BAE05C6.4070601@stoneleaf.us> <hom7jl$a75$1@dough.gmane.org>
	<4BAF5DBC.7050909@stoneleaf.us>
Message-ID: <hoo97j$k1d$1@dough.gmane.org>

On 2010-03-28 08:46 , Ethan Furman wrote:
> Robert Kern wrote:
>> On 2010-03-27 08:19 , Ethan Furman wrote:
>>
>>> Okay, different post for my actual questions. :)
>>>
>>> On the PyPI page for strait (http://pypi.python.org/pypi/strait/0.5.1)
>>> it has the example of choosing which methods to keep in the composed
>>> class:
>>>
>>> class TOSWidget(BaseWidget):
>>> __metaclass__ = include(Pack, Place, Grid)
>>> info = Pack.info.im_func
>>> config = Pack.config.im_func
>>> configure = Pack.configure.im_func
>>> slaves = Pack.slaves.im_func
>>> forget = Pack.forget.im_func
>>> propagate = Pack.propagate.im_func
>>>
>>> My question is:
>>>
>>> Why use
>>>
>>> info = Pack.info.im_func
>>>
>>> instead of
>>>
>>> info = Pack.info
>>>
>>> ?
>>
>>
>> Pack.info is an unbound method object attached to the Pack class, not
>> a function object. It has some extra semantics on top of functions and
>> is tied to the Pack class. The .im_func attribute gets the actual
>> function object underneath. When defining the TOSWidget class, the
>> objects defined in the suite under the class: statement need to be
>> actual functions in order to be turned into unbound methods attached
>> to the TOSWidget class.
>
> Ah, thank you.
>
> In Python 3, though, would the Pack.info form be correct?

Seems so:

Python 3.1 (r31:73578, Jun 27 2009, 21:49:46)
[GCC 4.0.1 (Apple Inc. build 5493)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
 >>> class Pack():
...   def info(self, x):
...     pass
...
 >>> Pack.info
<function info at 0xe8390>

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From nytrokiss at gmail.com  Sun Mar 28 16:01:38 2010
From: nytrokiss at gmail.com (James Matthews)
Date: Sun, 28 Mar 2010 13:01:38 -0700
Subject: Have you embraced Python 3.x yet?
In-Reply-To: <f3cc57c61003261733k79f996e1w8a02b580e930b65d@mail.gmail.com>
References: <hoicgd$23v0$1@news.telesweet.net>
	<f3cc57c61003261733k79f996e1w8a02b580e930b65d@mail.gmail.com>
Message-ID: <8a6b8e351003281301s121ed942x9847b4fc7d451f0f@mail.gmail.com>

I am still on py 2.6 and since my code is heavy model dependent. I am bound
to the most critical ones. Although I would really like if someone could
backport some new stuff done with the GIL on 3.2 (they had a nice talk about
it at PyCon)

On Fri, Mar 26, 2010 at 5:33 PM, geremy condra <debatem1 at gmail.com> wrote:

> On Fri, Mar 26, 2010 at 9:23 AM, Harishankar <v.harishankar at gmail.com>
> wrote:
> > Have you people embraced Python 3.x or still with 2.5 or 2.6?
> >
> > I personally want to switch over but not too sure how many people are
> > using 3.x as opposed to 2 so I want to keep my programs compatible for
> > the majority.
> >
> > -- Hari
> > --
> > http://mail.python.org/mailman/listinfo/python-list
> >
>
> Yes- I write new code in 3.x and backport it PRN.
>
> Geremy Condra
> --
> http://mail.python.org/mailman/listinfo/python-list
>



-- 
http://www.goldwatches.com

--
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From no.email at nospam.invalid  Sun Mar 28 16:46:40 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Sun, 28 Mar 2010 13:46:40 -0700
Subject: map, index
References: <mOIrn.824$I8.247@news.indigo.ie>
	<Xns9D499780917D2duncanbooth@127.0.0.1>
	<CNJrn.825$I8.401@news.indigo.ie>
Message-ID: <7xeij418en.fsf@ruckus.brouhaha.com>

Luis Quesada <l.quesada at 4c.ucc.ie> writes:
>> [ id*v for id,v in enumerate(L) ]
> Cool! Thanks!

If you really want to write that in pointfree style (untested):

   import itertools, operator
   ...
   itertools.starmap(operator.mul, enumerate(L))

For your other question, you could probably do something ugly
with ifilter, but it's not worth it.  

For the style of programming you're interested in, you should read the
docs for the itertools module.  Python culture in general tends to
not be that fond of heavy use of HOF's, since it's very easy to make
mistakes with its iterator protocol and with its dynamic type system.


From kgo at grant-olson.net  Sun Mar 28 16:46:50 2010
From: kgo at grant-olson.net (Grant Olson)
Date: Sun, 28 Mar 2010 16:46:50 -0400
Subject: ANN: Pyasm version 0.3
Message-ID: <4BAFC03A.8010707@grant-olson.net>

Pyasm is a full-featured dynamic assembler written entirely in Python.
By dynamic, I mean that it can be used to generate and execute machine
code in python at runtime without requiring the generation of object
files and linkage. It essentially allow 'inline' assembly in python
modules on x86 platforms.

In addition, pyasm can generate COFF format object files, which may be
of interest to anyone writing a compiler in python.

More details and downloads are available at:

http://www.grant-olson.net/python/pyasm

The 0.3 release is long overdue.  It includes:

+ A binary installer for python 2.6.  The previous binary installer was
python 2.4.

+ Automatic mapping of python structure values in the assembler.  For
Example, assuming EAX is a pointer to a string, MOV
[EAX+PyString_ob_sval],0x42424242 will change the first four letters of
the string to B's

+ The assembler now supports implicit string creation: PUSH 'foo\n\0'

+ The ability to build and test with the mingw toolset on windows.  This
previously required an MSVC toolset.  Thanks to Markus L?ll for sorting
this out.

-Grant


From no.email at nospam.invalid  Sun Mar 28 16:49:32 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Sun, 28 Mar 2010 13:49:32 -0700
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
Message-ID: <7xaats189v.fsf@ruckus.brouhaha.com>

Steve Howell <showell30 at yahoo.com> writes:
> The documentation is pretty clear on the intention that sum() is
> intended for numbers: ...

I've never been big on the idea of duck-typing addition.  Who would have
thought that (1,2,3)+(4.5.6) was something other than the vector sum?

I think itertools.chain more directly expresses what the OP was trying
to do, and is preferable for readability, independently of these
performance questions.


From philip at semanchuk.com  Sun Mar 28 17:43:46 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Sun, 28 Mar 2010 17:43:46 -0400
Subject: Python Psycopg2 - Interface Error : Connection already closed
In-Reply-To: <c1879e24-b76f-49bb-b7cb-0b7c8274044d@f14g2000pre.googlegroups.com>
References: <c1879e24-b76f-49bb-b7cb-0b7c8274044d@f14g2000pre.googlegroups.com>
Message-ID: <0A52C506-749F-460D-A660-A72BB793A1E2@semanchuk.com>


On Mar 27, 2010, at 5:14 PM, knobbyknees wrote:

> I'm not sure if this is the right group, but I'm hoping it is...
>
> Basically, I'm trying to use pgloader, which depends on python and
> psycopg2.  After banging my head against a wall, I found this:
>
> Found this:
> http://www.mail-archive.com/sqlalchemy at googlegroups.com/msg13209.html
>
> Although, the suggestion didn't work for me at all...
>
> Running this command:
> /usr/bin/pgloader -c /var/mybin/pgconfs/fr.conf
>
> Yields this in the pgloader.log (with the process just hanging)
>
> more /tmp/pgloader.log
> 27-03-2010 12:22:53 pgloader     INFO     Logger initialized
> 27-03-2010 12:22:53 pgloader     INFO     Reformat path is ['/usr/
> share/python-support/pgloader/reformat']
> 27-03-2010 12:22:53 pgloader     INFO     Will consider following
> sections:
> 27-03-2010 12:22:53 pgloader     INFO       fixed
> 27-03-2010 12:22:54 fixed        INFO     fixed processing
> 27-03-2010 12:22:54 pgloader     INFO     All threads are started,
> wait for them to terminate
> 27-03-2010 12:22:57 fixed        ERROR    connection already closed
> 27-03-2010 12:22:57 fixed        INFO     closing current database
> connection
>
> [pgsql]
> host                  = localhost
> port                  = 5432
> base                  = frdb
> user                  = username
> pass                  = password
>
>
> [fixed]
> table                 = fr
> format                = fixed
> filename              = /var/www/fr.txt
> ...
>
>
> This is what I see for the traceback:
> Traceback (most recent call last):
>  File "/usr/lib/python2.6/threading.py", line 525, in
> __bootstrap_inner
>    self.run()
>  File "/usr/lib/pymodules/python2.6/pgloader/pgloader.py", line 847,
> in run
>    self.terminate()
>  File "/usr/lib/pymodules/python2.6/pgloader/pgloader.py", line 874,
> in terminate
>    self.db.close()
>  File "/usr/lib/pymodules/python2.6/pgloader/db.py", line 103, in
> close
>    self.dbconn.close()
>
>
> I'm at a total loss here....  Can anyone please help me out?

Hi knobbyknees,
I can't help you with this problem, but the folks on the psycopg2  
mailing list are probably a much better crowd to ask:
http://lists.initd.org/mailman/listinfo/psycopg


Good luck
Philip


From tjreedy at udel.edu  Sun Mar 28 18:06:21 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Sun, 28 Mar 2010 18:06:21 -0400
Subject: Simple Traits Questions
In-Reply-To: <4BAF5DBC.7050909@stoneleaf.us>
References: <4BAE05C6.4070601@stoneleaf.us> <hom7jl$a75$1@dough.gmane.org>
	<4BAF5DBC.7050909@stoneleaf.us>
Message-ID: <hoojsq$m9b$1@dough.gmane.org>

On 3/28/2010 9:46 AM, Ethan Furman wrote:
> Robert Kern wrote:
>> On 2010-03-27 08:19 , Ethan Furman wrote:
>>
>>> Okay, different post for my actual questions. :)
>>>
>>> On the PyPI page for strait (http://pypi.python.org/pypi/strait/0.5.1)
>>> it has the example of choosing which methods to keep in the composed
>>> class:
>>>
>>> class TOSWidget(BaseWidget):
>>> __metaclass__ = include(Pack, Place, Grid)
>>> info = Pack.info.im_func
>>> config = Pack.config.im_func
>>> configure = Pack.configure.im_func
>>> slaves = Pack.slaves.im_func
>>> forget = Pack.forget.im_func
>>> propagate = Pack.propagate.im_func
>>>
>>> My question is:
>>>
>>> Why use
>>>
>>> info = Pack.info.im_func
>>>
>>> instead of
>>>
>>> info = Pack.info
>>>
>>> ?
>>
>>
>> Pack.info is an unbound method object attached to the Pack class, not
>> a function object. It has some extra semantics on top of functions and
>> is tied to the Pack class. The .im_func attribute gets the actual
>> function object underneath. When defining the TOSWidget class, the
>> objects defined in the suite under the class: statement need to be
>> actual functions in order to be turned into unbound methods attached
>> to the TOSWidget class.
>
> Ah, thank you.
>
> In Python 3, though, would the Pack.info form be correct?

Yes. One of the simplifications of Py3.



From l.quesada at 4c.ucc.ie  Sun Mar 28 18:14:31 2010
From: l.quesada at 4c.ucc.ie (Luis Quesada)
Date: Sun, 28 Mar 2010 23:14:31 +0100
Subject: map, index
In-Reply-To: <7xeij418en.fsf@ruckus.brouhaha.com>
References: <mOIrn.824$I8.247@news.indigo.ie>	<Xns9D499780917D2duncanbooth@127.0.0.1>	<CNJrn.825$I8.401@news.indigo.ie>
	<7xeij418en.fsf@ruckus.brouhaha.com>
Message-ID: <9xQrn.826$I8.164@news.indigo.ie>

Paul Rubin wrote:
> Luis Quesada <l.quesada at 4c.ucc.ie> writes:
>>> [ id*v for id,v in enumerate(L) ]
>> Cool! Thanks!
> 
> If you really want to write that in pointfree style (untested):
> 
>    import itertools, operator
>    ...
>    itertools.starmap(operator.mul, enumerate(L))
> 
> For your other question, you could probably do something ugly
> with ifilter, but it's not worth it.  
> 
> For the style of programming you're interested in, you should read the
> docs for the itertools module.  Python culture in general tends to
> not be that fond of heavy use of HOF's, since it's very easy to make
> mistakes with its iterator protocol and with its dynamic type system.
Thanks a lot for the pointer.
Python is rather cool indeed.
Cheers,
Luis


From tdelaney at avaya.com  Sun Mar 28 20:58:07 2010
From: tdelaney at avaya.com (Delaney, Timothy (Tim))
Date: Mon, 29 Mar 2010 08:58:07 +0800
Subject: Super() function
In-Reply-To: <4BAE359F.6090200@googlemail.com>
References: <4BAAD5E0.9050604@googlemail.com><op.u93uq1jyx6zn5v@gabriel.sleipnir-bsas>
	<4BAE359F.6090200@googlemail.com>
Message-ID: <E4C7BCAB1872014F81CEAACD25699B8C01A49E87@301081ANEX2.global.avaya.com>

> Gabriel Genellina wrote:
>> Alan Harris-Reid <aharrisreid at googlemail.com> escribi?:
>>
>>> Using Python 3.1, I sometimes use the super() function to call the 
>>> equivalent method from a parent class, for example
>>>
>>> def mymethod(self):
>>>     super().mymethod()
>>>     some more code...
>>>
>>> Is there any way of writing the code so that the super() call is 
>>> generic and automatically recognises the name of the current method 
>>> (ie. something like super().thismethod()) or do I always have to 
>>> repeat the method name after super()?
>>
>> This recipe does what you want:
>> http://code.activestate.com/recipes/286195-selfsuper/
>> (but requires a bit of black magic...)
>>
> Hi Gabriel - thanks for the reply.
>
> Goodness me - that's a mighty complicated recipe for what I want to achieve!
> I think I'll stick with repeating the method name - it's a small price to pay.

I wrote that recipe back before Python 3.x supported super() without parameters,
and near equivalent functionality was part of the new super PEP as an option.
However, Guido decided to go with the much simpler super().attr with no shortcutting.

If you think the pure-python version of the recipe is complicated, you should have
a look at the performance-optimised Pyrex version ;)

Tim Delaney


From steven at REMOVE.THIS.cybersource.com.au  Sun Mar 28 21:34:54 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 29 Mar 2010 01:34:54 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<7xaats189v.fsf@ruckus.brouhaha.com>
Message-ID: <pan.2010.03.29.01.34.54@REMOVE.THIS.cybersource.com.au>

On Sun, 28 Mar 2010 13:49:32 -0700, Paul Rubin wrote:

> Steve Howell <showell30 at yahoo.com> writes:
>> The documentation is pretty clear on the intention that sum() is
>> intended for numbers: ...
> 
> I've never been big on the idea of duck-typing addition.  Who would have
> thought that (1,2,3)+(4.5.6) was something other than the vector sum?

But your arguments are tuples, not vectors.

There are languages which do treat arithmetic operations on vectors as 
vector operations, as do (e.g.) H-P scientific calculators. That's a fine 
design choice, and it works for languages where the emphasis is on 
scientific calculations. But Python is a more generalist language, so in 
my mind it is more appropriate to treat lists as generic lists, and not 
numeric vectors:

[1, 2, 3] + [4, "a"] => [1, 2, 3, 4, "a"]

just as

"123" + "4a" => "1234a"



-- 
Steven


From keith at nekotaku.com  Sun Mar 28 22:14:19 2010
From: keith at nekotaku.com (KB)
Date: Sun, 28 Mar 2010 19:14:19 -0700 (PDT)
Subject: pythoncom.CoInitialize() not recognised in Eclipse
Message-ID: <4558b9a2-9d1c-4ec2-b564-9219be6443f2@w39g2000prd.googlegroups.com>

Hi there,

I have in the past used PythonWin to write python for COM, and
switched to Eclipse.

I am getting an error from the IDE saying it does not recognise
CoInitialize():

****
import pythoncom

pythoncom.CoInitialize()
pythoncom.CoUninitialize()
****

(red X next to the two bottom lines saying: "Undefined variable from
import: CoInitialize")

If I open a PyDev/Python Console window in Eclipse, I can type the
above, no errors, no problem.

I tried removing my Python Interpreter and re-adding/re-building but
no change.

python 2.5.2
eclipse 3.5.1
pydev 1.5.0

Thanks!



From ysj.ray at gmail.com  Sun Mar 28 22:25:50 2010
From: ysj.ray at gmail.com (Ray Allen)
Date: Mon, 29 Mar 2010 10:25:50 +0800
Subject: Have you embraced Python 3.x yet?
In-Reply-To: <8a6b8e351003281301s121ed942x9847b4fc7d451f0f@mail.gmail.com>
References: <hoicgd$23v0$1@news.telesweet.net>
	<f3cc57c61003261733k79f996e1w8a02b580e930b65d@mail.gmail.com>
	<8a6b8e351003281301s121ed942x9847b4fc7d451f0f@mail.gmail.com>
Message-ID: <797c8cbd1003281925q31217cb9q8436a8fe20388ac0@mail.gmail.com>

  In our company, we still use python-2.5.4, and will be updated to
python-2.5.5. I hope we can go to 2.6.x or 3.x, but I'm not sure when.
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From steven at REMOVE.THIS.cybersource.com.au  Sun Mar 28 22:45:32 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 29 Mar 2010 02:45:32 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
Message-ID: <pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>

On Sun, 28 Mar 2010 18:56:26 +0200, Alf P. Steinbach wrote:

> From a more practical point of view, the sum efficiency could be
> improved by doing the first addition using '+' and the rest using '+=',
> without changing the behavior.

But that would change the behaviour. The __iadd__ method is not the same 
as the __add__ method, and you can't guarantee that they will behave the 
same -- or even similarly.

And what about tuples? And subclasses of list/tuples? How many different 
types need to be optimized?

In practical terms, does anyone actually ever use sum on more than a 
handful of lists? I don't believe this is more than a hypothetical 
problem.

The primary use case for sum is adding numbers when floating point 
accuracy is not critical. If you need float accuracy, use math.fsum. If 
you need to add more than a handful of small lists, don't use sum: just 
calling extend in a loop is probably fast enough, or use itertools.chain. 
Trying to turn sum into an all-singing all-dancing function optimised for 
an ever-increasing number of objects is a fool's errand. The 
implementation of sum in C is already complex enough: 95 lines, excluding 
comments, blanks and braces, for something which is a lightweight 
function with very simple semantics.

But if anyone wants to submit a patch to the bug tracker, go right ahead. 
Without a patch though, I'd say that Python-Dev will consider this a non-
issue.



-- 
Steven


From jason.scheirer at gmail.com  Sun Mar 28 23:16:43 2010
From: jason.scheirer at gmail.com (Jason Scheirer)
Date: Sun, 28 Mar 2010 20:16:43 -0700 (PDT)
Subject: pythoncom.CoInitialize() not recognised in Eclipse
References: <4558b9a2-9d1c-4ec2-b564-9219be6443f2@w39g2000prd.googlegroups.com>
Message-ID: <03f8158f-cc4e-4e98-a45a-d0749030e877@w29g2000prg.googlegroups.com>

On Mar 28, 7:14?pm, KB <ke... at nekotaku.com> wrote:
> Hi there,
>
> I have in the past used PythonWin to write python for COM, and
> switched to Eclipse.
>
> I am getting an error from the IDE saying it does not recognise
> CoInitialize():
>
> ****
> import pythoncom
>
> pythoncom.CoInitialize()
> pythoncom.CoUninitialize()
> ****
>
> (red X next to the two bottom lines saying: "Undefined variable from
> import: CoInitialize")
>
> If I open a PyDev/Python Console window in Eclipse, I can type the
> above, no errors, no problem.
>
> I tried removing my Python Interpreter and re-adding/re-building but
> no change.
>
> python 2.5.2
> eclipse 3.5.1
> pydev 1.5.0
>
> Thanks!

PyDev is probably only looking at functions/classes defined in Python
source files and not ones defined in C extensions.

To confirm, try typing this in the window:

import _ctypes
_ctypes._Pointer()

If it says that _ctypes._Pointer doesn't exist, then that's obviously
the problem.


From dieterv at optionexplicit.be  Mon Mar 29 01:59:24 2010
From: dieterv at optionexplicit.be (Dieter Verfaillie)
Date: Mon, 29 Mar 2010 07:59:24 +0200
Subject: pythoncom.CoInitialize() not recognised in Eclipse
In-Reply-To: <4558b9a2-9d1c-4ec2-b564-9219be6443f2@w39g2000prd.googlegroups.com>
References: <4558b9a2-9d1c-4ec2-b564-9219be6443f2@w39g2000prd.googlegroups.com>
Message-ID: <20100329075924.64164i05fobzkdrw@webmail.linuxsystems.be>

Quoting KB <keith at nekotaku.com>:
> I am getting an error from the IDE saying it does not recognise
> CoInitialize():
>
> ****
> import pythoncom
>
> pythoncom.CoInitialize()
> pythoncom.CoUninitialize()
> ****

It works out of the box with PyDev 1.5.5.2010030420 on Eclipse 3.5.2  
on Windows XP. If nothing seems to work for you, you could try adding  
pythoncom to the
"Forced Builtins" tab of your Python interpreter configuration to see if it
helps (restart eclipse after you've done that, sometimes changes to  
the symbols
database don't get picked up without restarting eclipse...)

mvg,
Dieter

----------------------------------------------------------------
This message was sent using IMP, the Internet Messaging Program.



From gaoxtwarrior at gmail.com  Mon Mar 29 02:42:41 2010
From: gaoxtwarrior at gmail.com (Gao)
Date: Mon, 29 Mar 2010 14:42:41 +0800
Subject: How to verify a signature using SHA1WithRSA with python
Message-ID: <hopi51$2dq$1@www.shinco.com>

I have a public key, and I want to write a method that verify a string 
which is a signature signed by this public key's private key. And is 
M2Crypto I can't find algorithm named "SHA1WithRSA" or so . Could anyone 
help me?


From alfps at start.no  Mon Mar 29 03:34:07 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Mon, 29 Mar 2010 09:34:07 +0200
Subject: sum for sequences?
In-Reply-To: <pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
References: <hodb43$pt$1@reader1.panix.com>	<7x1vf91f60.fsf@ruckus.brouhaha.com>	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
Message-ID: <hopl1p$iga$1@news.eternal-september.org>

* Steven D'Aprano:
> On Sun, 28 Mar 2010 18:56:26 +0200, Alf P. Steinbach wrote:
> 
>> From a more practical point of view, the sum efficiency could be
>> improved by doing the first addition using '+' and the rest using '+=',
>> without changing the behavior.
> 
> But that would change the behaviour. The __iadd__ method is not the same 
> as the __add__ method, and you can't guarantee that they will behave the 
> same -- or even similarly.

Hm, I don't think it's documented (except if the reference implementation serves 
as documentation) which one is currently used.


> And what about tuples? And subclasses of list/tuples? How many different 
> types need to be optimized?

Point. One would need to check for availability of '+='.


> In practical terms, does anyone actually ever use sum on more than a 
> handful of lists? I don't believe this is more than a hypothetical 
> problem.

Agreed.


Cheers,

- Alf


From vamsi2123.vgn at gmail.com  Mon Mar 29 03:37:44 2010
From: vamsi2123.vgn at gmail.com (vamsi.v)
Date: Mon, 29 Mar 2010 13:07:44 +0530
Subject: header intact
Message-ID: <da7afd81003290037i1ed2cceue0288a1fa9570cdc@mail.gmail.com>

>
>    confirm bec6a35eaf702fee07b1542f90784d939bbbebff
>
>
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From greg.ewing at canterbury.ac.nz  Mon Mar 29 03:41:23 2010
From: greg.ewing at canterbury.ac.nz (Gregory Ewing)
Date: Mon, 29 Mar 2010 19:41:23 +1200
Subject: GIF89A and PIL
In-Reply-To: <2010032719445464825-aptshansen@gmailinvalid>
References: <2010032618455468300-aptshansen@gmailinvalid>
	<87oci9hjz9.fsf@dpt-info.u-strasbg.fr>
	<2010032719445464825-aptshansen@gmailinvalid>
Message-ID: <81b39uFggeU1@mid.individual.net>

Stephen Hansen wrote:

> So I wonder if there's just some hyper-optimization Photoshop does that 
> PIL can't round-trip.

You may find that PIL isn't bothering to compress at all,
or only doing it in a very simpleminded way.

-- 
Greg


From stephane at harobed.org  Mon Mar 29 04:12:09 2010
From: stephane at harobed.org (=?windows-1252?Q?St=E9phane_Klein?=)
Date: Mon, 29 Mar 2010 10:12:09 +0200
Subject: =?windows-1252?Q?I=27m_looking_for_html_cleaner=2E_Exa?=
	=?windows-1252?Q?mple_=3A_convert_=3Ch1=3E=3Cspan=3E=3Cfont=3Emy_?=
	=?windows-1252?Q?title=3C/font=3E=3C/span=3E=3C/h1=3E_=3D=3E_=3Ch1=3E?=
	=?windows-1252?Q?my_title=3C/h1=3E=85?=
Message-ID: <hopncq$gqk$1@dough.gmane.org>

Hi,

I work on HTML cleaner.

I export OpenOffice.org documents to HTML.
Next, I would like clean this HTML export files :

* remove comment
* remove style
* remove dispensable tag
* ...

some difficulty :

* convert <p>my text <span>foo</span> bar</p> => <p>my text foo par</p>
* convert <h1><span><font>my title</font></span></h1> => <h1>my title</h1>

to do this process, I use lxml and pyquery.

Question :

* are there some xml helper tools in Python to do this process ? I've 
looked for in pypi, I found nothing about it

If you confirm than this tools don't exists, I'll maybe publish a helper 
package to do this "clean" processing.

Thanks for your help,
Stephane



From v.harishankar at gmail.com  Mon Mar 29 05:09:42 2010
From: v.harishankar at gmail.com (Harishankar)
Date: Mon, 29 Mar 2010 09:09:42 +0000 (UTC)
Subject: I'm looking for html cleaner. Example : convert
	<h1><span><font>my title</font></span></h1> => <h1>my
	=?windows-1251?q?title=3C=2Fh1=3E=85?=
References: <mailman.1284.1269850345.23598.python-list@python.org>
Message-ID: <hopqom$2nn3$1@news.telesweet.net>

On Mon, 29 Mar 2010 10:12:09 +0200, St?phane Klein wrote:

> Hi,
> 
> I work on HTML cleaner.
> 
> I export OpenOffice.org documents to HTML. Next, I would like clean this
> HTML export files :
> 
> * remove comment
> * remove style
> * remove dispensable tag
> * ...
> 
> some difficulty :
> 
> * convert <p>my text <span>foo</span> bar</p> => <p>my text foo par</p>
> * convert <h1><span><font>my title</font></span></h1> => <h1>my
> title</h1>
> 
> to do this process, I use lxml and pyquery.
> 
> Question :
> 
> * are there some xml helper tools in Python to do this process ? I've
> looked for in pypi, I found nothing about it
> 
> If you confirm than this tools don't exists, I'll maybe publish a helper
> package to do this "clean" processing.
> 
> Thanks for your help,
> Stephane


Take a look at htmllib and HTMLParser (two different modules) in the 
Python built-in library.

In Python 3.x there is one called html.parser

You can use this to parse out specific tags from HTML documents. If you 
want something more advanced, consider using XML.





-- 
Harishankar (http://harishankar.org http://literaryforums.org)


From pieter.cogghe at gmail.com  Mon Mar 29 05:39:05 2010
From: pieter.cogghe at gmail.com (Yuccaplant)
Date: Mon, 29 Mar 2010 02:39:05 -0700 (PDT)
Subject: refer to self in a decorator on a class method
Message-ID: <baa34bdb-3ce8-4b8e-8b13-44f6b9611f72@z3g2000yqz.googlegroups.com>

Hi all,

I would like to do something like this:

********************
class HelloWorld (object):

    def __init__(self,clk):
        self.clk = clk

    @always(self.clk.posedge)
    def sayHello(self):
        print "%s Hello World!" % now()
********************

Problem is however I can't refer to self in the decorator call. Is
there any workarround?

thanks a lot,

pieter


From __peter__ at web.de  Mon Mar 29 05:53:51 2010
From: __peter__ at web.de (Peter Otten)
Date: Mon, 29 Mar 2010 11:53:51 +0200
Subject: refer to self in a decorator on a class method
References: <baa34bdb-3ce8-4b8e-8b13-44f6b9611f72@z3g2000yqz.googlegroups.com>
Message-ID: <hopta3$p0c$00$1@news.t-online.com>

Yuccaplant wrote:

> Hi all,
> 
> I would like to do something like this:
> 
> ********************
> class HelloWorld (object):
> 
>     def __init__(self,clk):
>         self.clk = clk
> 
>     @always(self.clk.posedge)
>     def sayHello(self):
>         print "%s Hello World!" % now()
> ********************
> 
> Problem is however I can't refer to self in the decorator call. Is
> there any workarround?

Pass attribute names:

>>> def always(name):
...     def always(f):
...             def wrapper(self, *args, **kw):
...                     print attrgetter(name)(self)
...                     return f(self, *args, **kw)
...             return wrapper
...     return always
...
>>> from operator import attrgetter
>>> class A(object):
...     def __init__(self, clk):
...             self.clk = clk
...     @always("clk.posedge")
...     def hello(self):
...             print "hello world"
...
>>> class clk:
...     posedge = 42
...
>>> A(clk).hello()
42
hello world

There may be better ways depending on your usecase.

Peter


From cournape at gmail.com  Mon Mar 29 06:06:53 2010
From: cournape at gmail.com (David Cournapeau)
Date: Mon, 29 Mar 2010 19:06:53 +0900
Subject: Have you embraced Python 3.x yet?
In-Reply-To: <7f014ea61003261326g3be655d8oefc1f710a6f7ae91@mail.gmail.com>
References: <hoicgd$23v0$1@news.telesweet.net>
	<195c7315-85cc-412d-8ef5-f13314aecaae@33g2000yqj.googlegroups.com>
	<7f014ea61003261326g3be655d8oefc1f710a6f7ae91@mail.gmail.com>
Message-ID: <5b8d13221003290306n7580c5dey8111071fbb4c073c@mail.gmail.com>

On Sat, Mar 27, 2010 at 5:26 AM, Chris Colbert <sccolbert at gmail.com> wrote:

>
> I won't switch until NumPy and SciPy make the jump.

We're almost there, though (mostly thanks to other people's work on Numpy):

http://github.com/cournape/scipy3/branches/py3k

David


From dr.mtarver at ukonline.co.uk  Mon Mar 29 06:46:10 2010
From: dr.mtarver at ukonline.co.uk (Mark Tarver)
Date: Mon, 29 Mar 2010 03:46:10 -0700 (PDT)
Subject: the Python Foundation
References: <70db60af-cad4-4385-b199-e181f1e39898@b7g2000yqd.googlegroups.com>
	<mailman.1159.1269465542.23598.python-list@python.org>
Message-ID: <63099700-c0a0-4d9c-b1f1-e872fe52f0cf@y17g2000yqd.googlegroups.com>

On 24 Mar, 22:18, "Steve Holden, Chairman, PSF" <chair... at python.org>
wrote:
> MarkTarver wrote:
> >>From the website
>
> > The Python Software Foundation (PSF) is a 501(c)(3) non-profit
> > corporation that
> > holds the intellectual property rights behind the Python programming
> > language. We manage the open source licensing for Python version 2.1
> > and later and own and protect the trademarks associated with Python.
>
> > Could somebody explain 'what holding the intellectual property rights'
> > means in this context and in what sense PSF manages the licensing and
> > protects the trademarks associated with Python? ? This is for my
> > education.
>
> The PSF requires that contributors sign an agreement licensing their
> code to us, and allowing us to distribute it under the license of our
> choosing (this does not in any way preclude the contributor licensing
> the same code to any other party under different terms).
>
> In this way people who use Python can be relatively sure that the code
> is untrammeled by claims of copyright or patent by anyone other than the
> PSF, and can therefore use it without fear of losing their rights to do
> so because of legal action by third parties.
>
> We have also registered the trademark "Python" for use in reference to
> computer programming languages, thereby ensuring that we can take action
> should some ill-advised individual or organization decide to produce
> another language with "Python" in its name which we did not feel
> conformed sufficiently strictly to the language definition, for instance.
>
> The PSF has an established policy with regard to the use of its
> trademarks, which you can read at
>
> ?http://www.python.org/psf/trademarks/
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ?Chairman, Python Software Foundation
> See PyCon Talks from Atlanta 2010 ?http://pycon.blip.tv/
> Holden Web LLC ? ? ? ? ? ? ? ?http://www.holdenweb.com/
> UPCOMING EVENTS: ? ? ? ?http://holdenweb.eventbrite.com/

Thankyou to all on this thread for this clarification.  I may return
and ask some questions if I need further clarification.

Mark


From pon at iki.fi  Mon Mar 29 07:13:49 2010
From: pon at iki.fi (Pasi Oja-Nisula)
Date: 29 Mar 2010 11:13:49 GMT
Subject: Python magazine
Message-ID: <slrnhr0unj.if3.pon@seepia.dyndns.org>

Python magazine web site says this:
"So, sit back and relax - enjoy your holidays, and come see us again on
January 26th, when the new  PyMag will launch."

Anyone heard any rumours or anything? I quite liked the magazine.

Pasi


From 1234567890 at vanwingerde.net  Mon Mar 29 08:11:57 2010
From: 1234567890 at vanwingerde.net (Jaap van Wingerde)
Date: Mon, 29 Mar 2010 05:11:57 -0700 (PDT)
Subject: Python magazine
References: <slrnhr0unj.if3.pon@seepia.dyndns.org>
Message-ID: <88f34d4c-b620-4d8e-9e02-4c42384735b6@35g2000yqm.googlegroups.com>

On 29 mrt, 13:13, Pasi Oja-Nisula <p... at iki.fi> wrote:
> Python magazine web site says this:
> "So, sit back and relax - enjoy your holidays, and come see us again on
> January 26th, when the new ?PyMag will launch."
<http://rhodesmill.org/brandon/2010/leaving-python-magazine/>



From ben+python at benfinney.id.au  Mon Mar 29 08:43:29 2010
From: ben+python at benfinney.id.au (Ben Finney)
Date: Mon, 29 Mar 2010 23:43:29 +1100
Subject: Have you embraced Python 3.x yet?
References: <hoicgd$23v0$1@news.telesweet.net>
	<195c7315-85cc-412d-8ef5-f13314aecaae@33g2000yqj.googlegroups.com>
	<7f014ea61003261326g3be655d8oefc1f710a6f7ae91@mail.gmail.com>
	<mailman.1285.1269857215.23598.python-list@python.org>
Message-ID: <878w9bnvri.fsf@benfinney.id.au>

David Cournapeau <cournape at gmail.com> writes:

> On Sat, Mar 27, 2010 at 5:26 AM, Chris Colbert <sccolbert at gmail.com> wrote:
> > I won't switch until NumPy and SciPy make the jump.
>
> We're almost there, though (mostly thanks to other people's work on
> Numpy):
>
> http://github.com/cournape/scipy3/branches/py3k

Are you maintaining separate parallel Python 3 versus Python 2 code
bases? If not, what are you doing in that regard?

-- 
 \      ?The most common way people give up their power is by thinking |
  `\                               they don't have any.? ?Alice Walker |
_o__)                                                                  |
Ben Finney


From cournape at gmail.com  Mon Mar 29 08:58:17 2010
From: cournape at gmail.com (David Cournapeau)
Date: Mon, 29 Mar 2010 21:58:17 +0900
Subject: Have you embraced Python 3.x yet?
In-Reply-To: <878w9bnvri.fsf@benfinney.id.au>
References: <hoicgd$23v0$1@news.telesweet.net>
	<195c7315-85cc-412d-8ef5-f13314aecaae@33g2000yqj.googlegroups.com>
	<7f014ea61003261326g3be655d8oefc1f710a6f7ae91@mail.gmail.com>
	<mailman.1285.1269857215.23598.python-list@python.org>
	<878w9bnvri.fsf@benfinney.id.au>
Message-ID: <5b8d13221003290558w18fa6c94s4605189382148366@mail.gmail.com>

On Mon, Mar 29, 2010 at 9:43 PM, Ben Finney <ben+python at benfinney.id.au> wrote:
> David Cournapeau <cournape at gmail.com> writes:
>
>> On Sat, Mar 27, 2010 at 5:26 AM, Chris Colbert <sccolbert at gmail.com> wrote:
>> > I won't switch until NumPy and SciPy make the jump.
>>
>> We're almost there, though (mostly thanks to other people's work on
>> Numpy):
>>
>> http://github.com/cournape/scipy3/branches/py3k
>
> Are you maintaining separate parallel Python 3 versus Python 2 code
> bases?

No, we don't have the manpower to have two code bases - the C code
handles both versions, and the python 2 code is converted to python 3
"on the fly".

We are lucky not to have too much IO / string handling, which are the
hard things to handle with 2to3. The hard part was NumPy, because it
used the python C api so much. Porting scipy to something somewhat
usable was an half-day job,

cheers,

David


From wolftracks at invalid.com  Mon Mar 29 09:04:17 2010
From: wolftracks at invalid.com (W. eWatson)
Date: Mon, 29 Mar 2010 06:04:17 -0700
Subject: Why this Difference in Importing NumPy 1.2 vs 1.4?
In-Reply-To: <honvk7$thl$1@news.eternal-september.org>
References: <honvk7$thl$1@news.eternal-september.org>
Message-ID: <hoq8gi$krt$1@news.eternal-september.org>

Add/Remove under Control Panel. It's a numpy problem.

On 3/28/2010 9:20 AM, W. eWatson wrote:
> I wrote a program in Python 2.5 under Win7 and it runs fine using Numpy
> 1.2 , but not on a colleague's machine who has a slightly newer 2.5 and
> uses NumPy 1.4. We both use IDLE to execute the program. During import
> he gets this:
>
>  >>>
> Traceback (most recent call last):
> File "C:\Documents and Settings\HP_Administrator.DavesDesktop\My
> Documents\Astro\Meteors\NC-FireballReport.py", line 38, in <module>
> from scipy import stats as stats # scoreatpercentile
> File "C:\Python25\lib\site-packages\scipy\stats\__init__.py", line 7, in
> <module>
> from stats import *
> File "C:\Python25\lib\site-packages\scipy\stats\stats.py", line 191, in
> <module>
> import scipy.special as special
> File "C:\Python25\lib\site-packages\scipy\special\__init__.py", line 22,
> in <module>
> from numpy.testing import NumpyTest
> ImportError: cannot import name NumpyTest
>  >>>
>
> Comments?
>
> It looks as though the problem is in NumPy 1.4. If it's either in NumPy
> or SciPy, how does my colleague back out to an earlier version to agree
> with mine? Does he just pull down 1.3 or better 1.2 (I use it.), and
> install it? How does he somehow remove 1.4? Is it as easy as going to
> IDLE's path browser and removing, under site-packages, numpy? (I'm not
> sure that's even possible. I don't see a right-click menu.)



From slais-www at ucl.ac.uk  Mon Mar 29 09:09:48 2010
From: slais-www at ucl.ac.uk (djc)
Date: Mon, 29 Mar 2010 14:09:48 +0100
Subject: OT: Meaning of "monkey"
In-Reply-To: <e684e6ae-be88-4d2b-8447-733f3a10d882@z11g2000yqz.googlegroups.com>
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
	<6eca52f7-0a55-4c96-8144-9face3c88124@15g2000yqi.googlegroups.com>
	<e684e6ae-be88-4d2b-8447-733f3a10d882@z11g2000yqz.googlegroups.com>
Message-ID: <hoq8qs$9k5m$1@uns-a.ucl.ac.uk>

Mensanator wrote:
> On Mar 26, 2:44 pm, Phlip <phlip2... at gmail.com> wrote:
>> On Mar 26, 6:14 am, Luis M. Gonz?lez <luis... at gmail.com> wrote:
>>
>>> Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
>>> Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
>>> Monkeys everywhere.
>>> Sorry for the off topic question, but what does "monkey" mean in a
>>> nerdy-geek context??
>>> Luis
>> Better at typing than thinking.
> 
> Really? I thought it was more of a reference to Eddington, i.e., given
> enough time even a monkey can type out a program.


Precisely, given infinite typing and zero thinking...

Note also the expression 'talk to the organ  grinder not the monkey'

and 'a trained monkey could do it'

and then there are monkey wrenches, and monkey bikes...

and never call the Librarian a monkey


-- 
David Clark, MSc, PhD.              UCL Centre for Publishing
                                    Gower Str London WCIE 6BT
What sort of web animal are you?
            <https://www.bbc.co.uk/labuk/experiments/webbehaviour>


From bruno.42.desthuilliers at websiteburo.invalid  Mon Mar 29 09:22:06 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Mon, 29 Mar 2010 15:22:06 +0200
Subject: OT: Meaning of "monkey"
In-Reply-To: <hoq8qs$9k5m$1@uns-a.ucl.ac.uk>
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
	<6eca52f7-0a55-4c96-8144-9face3c88124@15g2000yqi.googlegroups.com>
	<e684e6ae-be88-4d2b-8447-733f3a10d882@z11g2000yqz.googlegroups.com>
	<hoq8qs$9k5m$1@uns-a.ucl.ac.uk>
Message-ID: <4bb0a951$0$11311$426a34cc@news.free.fr>

djc a ?crit :
>
> and never call the Librarian a monkey

ook ?!?


From krister.svanlund at gmail.com  Mon Mar 29 09:32:08 2010
From: krister.svanlund at gmail.com (Krister Svanlund)
Date: Mon, 29 Mar 2010 15:32:08 +0200
Subject: OT: Meaning of "monkey"
In-Reply-To: <hoq8qs$9k5m$1@uns-a.ucl.ac.uk>
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
	<6eca52f7-0a55-4c96-8144-9face3c88124@15g2000yqi.googlegroups.com>
	<e684e6ae-be88-4d2b-8447-733f3a10d882@z11g2000yqz.googlegroups.com>
	<hoq8qs$9k5m$1@uns-a.ucl.ac.uk>
Message-ID: <2cf430a61003290632k1e40eb81r38e8b0a67d6eb3a8@mail.gmail.com>

On Mon, Mar 29, 2010 at 3:09 PM, djc <slais-www at ucl.ac.uk> wrote:
> Mensanator wrote:
>> On Mar 26, 2:44 pm, Phlip <phlip2... at gmail.com> wrote:
>>> On Mar 26, 6:14 am, Luis M. Gonz?lez <luis... at gmail.com> wrote:
>>>
>>>> Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
>>>> Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
>>>> Monkeys everywhere.
>>>> Sorry for the off topic question, but what does "monkey" mean in a
>>>> nerdy-geek context??
>>>> Luis
>>> Better at typing than thinking.
>>
>> Really? I thought it was more of a reference to Eddington, i.e., given
>> enough time even a monkey can type out a program.
>
>
> Precisely, given infinite typing and zero thinking...
>
> Note also the expression 'talk to the organ ?grinder not the monkey'
>
> and 'a trained monkey could do it'
>
> and then there are monkey wrenches, and monkey bikes...
>
> and never call the Librarian a monkey
>

The monkeys comes from different places... for example:
"The term monkey patch was first used as guerrilla patch, [...], which
was referred to as the patches engaging in battle with each other.
Since the word guerrilla and gorilla are near-homophones, people
started using the incorrect term gorilla patch instead of guerrilla
patch. When a developer then created a guerrilla patch they tried very
hard to avoid any battles that may ensue due to the patch and the term
monkey patch was coined to make the patch sound less forceful."

And then there is, as said, monkey wrenches which is utility tools.
Codemonkeys, i believe, comes from the infinite monkeys theory.


From pierre.gaillard at gmail.com  Mon Mar 29 09:44:51 2010
From: pierre.gaillard at gmail.com (Pierre)
Date: Mon, 29 Mar 2010 06:44:51 -0700 (PDT)
Subject: Matplotlib patches collection + alpha face
Message-ID: <7727f7e7-6337-4107-92c3-f5cfb2e90772@q15g2000yqj.googlegroups.com>

Hello,

I would like to draw on the same axes several patches (rectangle) with
different alpha-face (transparency)...
Anyone has an idea ?
In particular, I would like to use the class PatchCollection but it
seems that the alpha property is common to all the patches...

Thanks for your help.


From debatem1 at gmail.com  Mon Mar 29 10:01:28 2010
From: debatem1 at gmail.com (geremy condra)
Date: Mon, 29 Mar 2010 10:01:28 -0400
Subject: How to verify a signature using SHA1WithRSA with python
In-Reply-To: <hopi51$2dq$1@www.shinco.com>
References: <hopi51$2dq$1@www.shinco.com>
Message-ID: <h2nf3cc57c61003290701i614ff531sf7d219ef8e0935fb@mail.gmail.com>

On Mon, Mar 29, 2010 at 2:42 AM, Gao <gaoxtwarrior at gmail.com> wrote:
> I have a public key, and I want to write a method that verify a string which
> is a signature signed by this public key's private key. And is M2Crypto I
> can't find algorithm named "SHA1WithRSA" or so . Could anyone help me?
> --
> http://mail.python.org/mailman/listinfo/python-list
>

In OpenSSL you would simply use the EVP_Verify* functions, I don't
see that in M2Crypto's documentation though. You may have to use
RSA_Verify.

If you're not forced to use M2Crypto, you *may* want to check out evpy,
which is a set of ctypes bindings for openssl's evp interface and a very
easy to use wrapper. It's available at http://gitorious.org/evpy, and will
be up for a first release in a few weeks.

Geremy Condra


From pmaupin at gmail.com  Mon Mar 29 10:40:54 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 29 Mar 2010 07:40:54 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
Message-ID: <35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>

On Mar 28, 9:45?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> And what about tuples? And subclasses of list/tuples? How many different
> types need to be optimized?

One of the beautiful things about Python is that, for most things,
there are few surprises for even new users.  "There should be one
obvious way to do it" for the user means that, sometimes, under the
hood, there are a lot of special cases for the implementers.

> In practical terms, does anyone actually ever use sum on more than a
> handful of lists? I don't believe this is more than a hypothetical
> problem.

Right now, it's probably not, because when somebody sums a large list
and gets thwacked on the head by the lack of efficiency, they then
come here and get thwacked because "everybody knows" they should user
itertools or something else; not sum().
>
> The primary use case for sum is adding numbers when floating point
> accuracy is not critical. If you need float accuracy, use math.fsum.

See, I think the very existence of math.fsum() already violates "there
should be one obvious way to do it."

> But if anyone wants to submit a patch to the bug tracker, go right ahead.
> Without a patch though, I'd say that Python-Dev will consider this a non-
> issue.

Agreed.  Wish I had the time to do this sort of cleanup.

Regards,
Pat


From showell30 at yahoo.com  Mon Mar 29 11:12:00 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Mon, 29 Mar 2010 08:12:00 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au> 
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
Message-ID: <069f41e7-6a4a-4a40-b570-2559ca5ce69d@x11g2000prb.googlegroups.com>

On Mar 29, 7:40?am, Patrick Maupin <pmau... at gmail.com> wrote:
> On Mar 28, 9:45?pm, Steven D'Aprano
>
> <ste... at REMOVE.THIS.cybersource.com.au> wrote:
> > And what about tuples? And subclasses of list/tuples? How many different
> > types need to be optimized?
>
> One of the beautiful things about Python is that, for most things,
> there are few surprises for even new users. ?"There should be one
> obvious way to do it" for the user means that, sometimes, under the
> hood, there are a lot of special cases for the implementers.
>

If nothing else, I think it's reasonably for users to expect symmetry.

If you can use "+" to concatentate lists, then it seems reasonable
that something spelled "sum" would concatenate lists as well, and in
reasonable time.

> > In practical terms, does anyone actually ever use sum on more than a
> > handful of lists? I don't believe this is more than a hypothetical
> > problem.
>
> Right now, it's probably not, because when somebody sums a large list
> and gets thwacked on the head by the lack of efficiency, they then
> come here and get thwacked because "everybody knows" they should user
> itertools or something else; not sum().
>

Indeed.  It would be nice if the docs for sum() at least pointed to
list(itertools.chain(list_of_lists)), or whatever the most kosher
alternative is supposed to be.

It only takes a handful of sublists, about ten on my box, to expose
the limitation of the Shlemeil-the-Painter O(M*N*N) algorithm that's
under the hood.  It only takes 200 sublists to start getting a 10x
degradation in performance.

> > The primary use case for sum is adding numbers when floating point
> > accuracy is not critical. If you need float accuracy, use math.fsum.
>
> See, I think the very existence of math.fsum() already violates "there
> should be one obvious way to do it."
>

The nice thing about math.fsum() is that it is at least documented
from sum(), although I suspect some users try sum() without even
consulting the docs.

You could appease all users with an API where the most obvious choice,
sum(), never behaves badly, and where users can still call more
specialized versions (math.fsum() and friends) directly if they know
what they are doing.  This goes back to the statement that Patrick
makes--under the hood, this means more special cases for implementers,
but fewer pitfalls for users.



From gareth.sims at googlemail.com  Mon Mar 29 11:31:46 2010
From: gareth.sims at googlemail.com (Gryff)
Date: Mon, 29 Mar 2010 08:31:46 -0700 (PDT)
Subject: Newbie question: Tuples and reading csv files
Message-ID: <d16ea479-9814-4240-ae8a-52b77b2d6898@x3g2000yqd.googlegroups.com>

Hi

Its been 20 years since I programmed, so I'm stepping back in via
Python. However I'm beating my brains on tuples/lists (what I used to
know as arrays). I've fooled around with small code snippets and tried
a few things, but I can't figure out how to grab elements of
tuples ...

For example, I'm reading in a small csv file like this:

import csv

csvfile = open("example.csv")

#sniff the dialect
dialect = csv.Sniffer().sniff(csvfile.read(1024))
csvfile.seek(0)

# get file in using reader method

mylist=[]
reader = csv.reader(csvfile, dialect)

# grab the lines into a reader and pass to mylist

for row in reader:

    mylist.append(row)

# now print something out to prove this worked

print mylist[:3]

and the output I get is:

['Date', 'Open', 'High', 'Low', 'Close', 'Volume', 'Adj Close']
['2010-03-05', '224.20', '230.70', '223.80', '228.30', '5051500',
'228.30']
['2010-03-04', '223.00', '228.50', '220.50', '224.50', '4040500',
'224.50']

So far so good but not useful. My "mylist" has all the data in there,
but I can only figure out how to get each line out!?!
-> I want to get access to the individual items in each line. In my
bad old days I'd have used an array and grabbed "mylist
[row,item]" ...job done. Try as I like and after *lots* of reading
around, I can't figure out whether:

a) I'm missing something...really...simple
b) "You can't do that"  (and I should just use numpy and arrays?)
c) errrr....

Like I said, basic/newbie question from a programmer who spent 20
years away from it.

Cheers


Gareth


From showell30 at yahoo.com  Mon Mar 29 11:34:32 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Mon, 29 Mar 2010 08:34:32 -0700 (PDT)
Subject: Newbie question: Tuples and reading csv files
References: <d16ea479-9814-4240-ae8a-52b77b2d6898@x3g2000yqd.googlegroups.com>
Message-ID: <029f4a90-fbe5-4739-9c1d-f048046e4d9f@k5g2000prg.googlegroups.com>

On Mar 29, 8:31?am, Gryff <gareth.s... at googlemail.com> wrote:
> Hi
>
> Its been 20 years since I programmed, so I'm stepping back in via
> Python. However I'm beating my brains on tuples/lists (what I used to
> know as arrays). I've fooled around with small code snippets and tried
> a few things, but I can't figure out how to grab elements of
> tuples ...
>
> For example, I'm reading in a small csv file like this:
>
> import csv
>
> csvfile = open("example.csv")
>
> #sniff the dialect
> dialect = csv.Sniffer().sniff(csvfile.read(1024))
> csvfile.seek(0)
>
> # get file in using reader method
>
> mylist=[]
> reader = csv.reader(csvfile, dialect)
>
> # grab the lines into a reader and pass to mylist
>
> for row in reader:
>
> ? ? mylist.append(row)
>
> # now print something out to prove this worked
>
> print mylist[:3]
>
> and the output I get is:
>
> ['Date', 'Open', 'High', 'Low', 'Close', 'Volume', 'Adj Close']
> ['2010-03-05', '224.20', '230.70', '223.80', '228.30', '5051500',
> '228.30']
> ['2010-03-04', '223.00', '228.50', '220.50', '224.50', '4040500',
> '224.50']
>
> So far so good but not useful. My "mylist" has all the data in there,
> but I can only figure out how to get each line out!?!
> -> I want to get access to the individual items in each line. In my
> bad old days I'd have used an array and grabbed "mylist
> [row,item]" ...job done.

You are not too far:

mylist[row][item]

If you try that and still get an error (unlikely), be sure to post the
exact code you tried and any error messages.



From kushal.kumaran+python at gmail.com  Mon Mar 29 11:42:37 2010
From: kushal.kumaran+python at gmail.com (Kushal Kumaran)
Date: Mon, 29 Mar 2010 21:12:37 +0530
Subject: Newbie question: Tuples and reading csv files
In-Reply-To: <d16ea479-9814-4240-ae8a-52b77b2d6898@x3g2000yqd.googlegroups.com>
References: <d16ea479-9814-4240-ae8a-52b77b2d6898@x3g2000yqd.googlegroups.com>
Message-ID: <1e364c4e1003290842q1b0f65a4kc09faae19a40f097@mail.gmail.com>

On Mon, Mar 29, 2010 at 9:01 PM, Gryff <gareth.sims at googlemail.com> wrote:
> Hi
>
> Its been 20 years since I programmed, so I'm stepping back in via
> Python. However I'm beating my brains on tuples/lists (what I used to
> know as arrays). I've fooled around with small code snippets and tried
> a few things, but I can't figure out how to grab elements of
> tuples ...
>
> For example, I'm reading in a small csv file like this:
>
> import csv
>
> csvfile = open("example.csv")
>
> #sniff the dialect
> dialect = csv.Sniffer().sniff(csvfile.read(1024))
> csvfile.seek(0)
>
> # get file in using reader method
>
> mylist=[]
> reader = csv.reader(csvfile, dialect)
>
> # grab the lines into a reader and pass to mylist
>
> for row in reader:
>
> ? ?mylist.append(row)
>
> # now print something out to prove this worked
>
> print mylist[:3]
>
> and the output I get is:
>
> ['Date', 'Open', 'High', 'Low', 'Close', 'Volume', 'Adj Close']
> ['2010-03-05', '224.20', '230.70', '223.80', '228.30', '5051500',
> '228.30']
> ['2010-03-04', '223.00', '228.50', '220.50', '224.50', '4040500',
> '224.50']
>
> So far so good but not useful. My "mylist" has all the data in there,
> but I can only figure out how to get each line out!?!
> -> I want to get access to the individual items in each line. In my
> bad old days I'd have used an array and grabbed "mylist
> [row,item]" ...job done. Try as I like and after *lots* of reading
> around, I can't figure out whether:
>

mylist is a list of lists.  mylist[0] gives you the first list (the
row with the column headings, in your case).  You can get the first
item in that list by mylist[0][0].

> a) I'm missing something...really...simple
> b) "You can't do that" ?(and I should just use numpy and arrays?)
> c) errrr....
>
> Like I said, basic/newbie question from a programmer who spent 20
> years away from it.
>


-- 
regards,
kushal


From patentsvnc at gmail.com  Mon Mar 29 11:50:20 2010
From: patentsvnc at gmail.com (Den)
Date: Mon, 29 Mar 2010 08:50:20 -0700 (PDT)
Subject: OT: Meaning of "monkey"
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
Message-ID: <5ad930bd-131a-4b7d-99ea-e3258f75449e@a16g2000pre.googlegroups.com>

On Mar 26, 6:14?am, Luis M. Gonz?lez <luis... at gmail.com> wrote:
> Webmonkey, Greasemonkey, monkey-patching, Tracemonkey, J?germonkey,
> Spidermonkey, Mono (monkey in spanish), codemonkey, etc, etc, etc...
>
> Monkeys everywhere.
> Sorry for the off topic question, but what does "monkey" mean in a
> nerdy-geek context??
>
> Luis

To go even more off topic, I remember Trunk Monkey commercials.

Also, I remember a web site whose intentions was to simulate monkeys
typing Shakespeare.  They had set up a distributed system where you
could contribute your computer to providing random characters, which
they compared to a selected set of Shakespeare's plays.  Just before
the site disappeared (or I lost track of it), they had received
strings representing the first maybe 15 or 20 characters of several
plays.

Den


From gareth.sims at googlemail.com  Mon Mar 29 11:51:25 2010
From: gareth.sims at googlemail.com (Gryff)
Date: Mon, 29 Mar 2010 08:51:25 -0700 (PDT)
Subject: Newbie question: Tuples and reading csv files
References: <d16ea479-9814-4240-ae8a-52b77b2d6898@x3g2000yqd.googlegroups.com>
	<029f4a90-fbe5-4739-9c1d-f048046e4d9f@k5g2000prg.googlegroups.com>
Message-ID: <f268290b-f862-4773-bff8-c8ebc1deaa0a@33g2000yqj.googlegroups.com>

*tada!* *enlightenment*

Thanks - I figured it was something simple.... :-)


From tim at johnsons-web.com  Mon Mar 29 12:40:23 2010
From: tim at johnsons-web.com (Tim Johnson)
Date: Mon, 29 Mar 2010 11:40:23 -0500
Subject: Jython as an alternative to Python
Message-ID: <slrnhr1its.ng8.tim@bart.johnson.com>

FYI: I've used python for years primarily on *nix platforms and
primarily for web programming. I'm considering studying a scripting
language that uses and accesses java. My first obvious choice would by
jython. The following questions could probably be answered by pointers
to previous discussions, docs or blogs.

1)What can jython *do* that cannot be done by python.

2)What is the current state of jython as a development community?
  I.E. is it being upgraded, updated etc.

3)Is the jython community "bound to" the python community?
  I.E. I don't think python is going to "go away", what happens if
	jython development "stalls".

4)If someone in this community would consider a java scripting language
other than jython, what would it be? And why?

5)Are there issues installing and deploying jython on shared webservers?
  I.E. Assuming that a dedicated server is one that I have full access to and
	can install what I please, and a shared server would not afford me
	such access; is there any trend for "server farms" to install jython?

Thanks 
-- 
Tim 
tim at johnsons-web.com
http://www.akwebsoft.com


From keith at nekotaku.com  Mon Mar 29 13:16:40 2010
From: keith at nekotaku.com (KB)
Date: Mon, 29 Mar 2010 10:16:40 -0700 (PDT)
Subject: pythoncom.CoInitialize() not recognised in Eclipse
References: <4558b9a2-9d1c-4ec2-b564-9219be6443f2@w39g2000prd.googlegroups.com>
	<03f8158f-cc4e-4e98-a45a-d0749030e877@w29g2000prg.googlegroups.com>
Message-ID: <9e8fc13f-f8f2-4efa-8900-d19e228f0c99@t9g2000prh.googlegroups.com>

On Mar 28, 8:16?pm, Jason Scheirer <jason.schei... at gmail.com> wrote:
> On Mar 28, 7:14?pm, KB <ke... at nekotaku.com> wrote:
>
>
>
> > Hi there,
>
> > I have in the past used PythonWin to write python for COM, and
> > switched to Eclipse.
>
> > I am getting an error from the IDE saying it does not recognise
> > CoInitialize():
>
> > ****
> > import pythoncom
>
> > pythoncom.CoInitialize()
> > pythoncom.CoUninitialize()
> > ****
>
> > (red X next to the two bottom lines saying: "Undefined variable from
> > import: CoInitialize")
>
> > If I open a PyDev/Python Console window in Eclipse, I can type the
> > above, no errors, no problem.
>
> > I tried removing my Python Interpreter and re-adding/re-building but
> > no change.
>
> > python 2.5.2
> > eclipse 3.5.1
> > pydev 1.5.0
>
> > Thanks!
>
> PyDev is probably only looking at functions/classes defined in Python
> source files and not ones defined in C extensions.
>
> To confirm, try typing this in the window:
>
> import _ctypes
> _ctypes._Pointer()
>
> If it says that _ctypes._Pointer doesn't exist, then that's obviously
> the problem.

No problems at all with the editor recognising the above. Also note
that I tried the pythoncom snippet in my OP from the IDE's python
console without issue... weird.


From keith at nekotaku.com  Mon Mar 29 13:50:18 2010
From: keith at nekotaku.com (KB)
Date: Mon, 29 Mar 2010 10:50:18 -0700 (PDT)
Subject: pythoncom.CoInitialize() not recognised in Eclipse
References: <4558b9a2-9d1c-4ec2-b564-9219be6443f2@w39g2000prd.googlegroups.com>
	<mailman.1282.1269842879.23598.python-list@python.org>
Message-ID: <a4405bc6-178c-4856-827a-78246ecab5cc@u5g2000prd.googlegroups.com>

On Mar 28, 10:59?pm, "Dieter Verfaillie" <diet... at optionexplicit.be>
wrote:
> Quoting KB <ke... at nekotaku.com>:
>
> > I am getting an error from the IDE saying it does not recognise
> > CoInitialize():
>
> > ****
> > import pythoncom
>
> > pythoncom.CoInitialize()
> > pythoncom.CoUninitialize()
> > ****
>
> It works out of the box with PyDev 1.5.5.2010030420 on Eclipse 3.5.2 ?
> on Windows XP. If nothing seems to work for you, you could try adding ?
> pythoncom to the
> "Forced Builtins" tab of your Python interpreter configuration to see if it
> helps (restart eclipse after you've done that, sometimes changes to ?
> the symbols
> database don't get picked up without restarting eclipse...)

Dieter, Thanks, I tried updating my PyDev and Eclipse to your
versions.

Still same issue. How exactly would I add pythoncom to the Forced
Builtins ? I tried simply adding "pythoncom" to the Forced Builtin's
tab but no change.

Any suggestions?


From steve at holdenweb.com  Mon Mar 29 14:02:04 2010
From: steve at holdenweb.com (Steve Holden)
Date: Mon, 29 Mar 2010 14:02:04 -0400
Subject: Jython as an alternative to Python
In-Reply-To: <slrnhr1its.ng8.tim@bart.johnson.com>
References: <slrnhr1its.ng8.tim@bart.johnson.com>
Message-ID: <hoqpv3$m88$1@dough.gmane.org>

Tim Johnson wrote:
> FYI: I've used python for years primarily on *nix platforms and
> primarily for web programming. I'm considering studying a scripting
> language that uses and accesses java. My first obvious choice would by
> jython. The following questions could probably be answered by pointers
> to previous discussions, docs or blogs.
> 
> 1)What can jython *do* that cannot be done by python.
> 
Import Java classes and instantiate them, calling their methods from Python.

> 2)What is the current state of jython as a development community?
>   I.E. is it being upgraded, updated etc.
> 
It's currently just about at 2.6, and the developers are committed to a
port to 3.x (probably 3.2, I suspect) but haven't yet committed to a
timescale. Two of the main developers have just started work at Sauce
Labs, and this may affect their availability.

> 3)Is the jython community "bound to" the python community?
>   I.E. I don't think python is going to "go away", what happens if
> 	jython development "stalls".
> 
The PSF has already once provided a grant to keep Jython moving forward
when it looked like it might stall. I don't know whether this is
inevitable in the future, but *I* think Jython should be kept in the
mainstream.

> 4)If someone in this community would consider a java scripting language
> other than jython, what would it be? And why?
> 
Pass.

> 5)Are there issues installing and deploying jython on shared webservers?
>   I.E. Assuming that a dedicated server is one that I have full access to and
> 	can install what I please, and a shared server would not afford me
> 	such access; is there any trend for "server farms" to install jython?

I don't know. A survey of Python-friendly hosting companies would be
useful. You could use

  http://wiki.python.org/moin/PythonHosting

as a starting point, and publish the data you discover.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From gagsl-py2 at yahoo.com.ar  Mon Mar 29 15:19:18 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Mon, 29 Mar 2010 16:19:18 -0300
Subject: Super() function
References: <4BAAD5E0.9050604@googlemail.com>
	<op.u93uq1jyx6zn5v@gabriel.sleipnir-bsas>
	<4BAE359F.6090200@googlemail.com>
	<E4C7BCAB1872014F81CEAACD25699B8C01A49E87@301081ANEX2.global.avaya.com>
Message-ID: <op.vacfyghqx6zn5v@lepton.softlabbsas.com.ar>

En Sun, 28 Mar 2010 21:58:07 -0300, Delaney, Timothy (Tim)  
<tdelaney at avaya.com> escribi?:
>> Gabriel Genellina wrote:
>>> Alan Harris-Reid <aharrisreid at googlemail.com> escribi?:
>>>
>>>> Using Python 3.1, I sometimes use the super() function to call the
>>>> equivalent method from a parent class, for example
>>>>
>>>> def mymethod(self):
>>>>     super().mymethod()
>>>>     some more code...
>>>
>>> This recipe does what you want:
>>> http://code.activestate.com/recipes/286195-selfsuper/
> If you think the pure-python version of the recipe is complicated, you  
> should have
> a look at the performance-optimised Pyrex version ;)

Where can we look at it? The link in the activestate recipe does not work  
anymore :(

-- 
Gabriel Genellina



From tim at johnsons-web.com  Mon Mar 29 15:40:22 2010
From: tim at johnsons-web.com (Tim Johnson)
Date: Mon, 29 Mar 2010 14:40:22 -0500
Subject: Jython as an alternative to Python
References: <slrnhr1its.ng8.tim@bart.johnson.com>
	<mailman.1290.1269885750.23598.python-list@python.org>
Message-ID: <slrnhr20qd.ng8.tim@bart.johnson.com>

On 2010-03-29, Steve Holden <steve at holdenweb.com> wrote:
> Tim Johnson wrote:
<<.>> 1)What can jython *do* that cannot be done by python.
>> 
> Import Java classes and instantiate them, calling their methods from Python.
 Of course
>> 2)What is the current state of jython as a development community?
>>   I.E. is it being upgraded, updated etc.
>> 
> It's currently just about at 2.6, and the developers are committed to a
> port to 3.x (probably 3.2, I suspect) but haven't yet committed to a
> timescale. Two of the main developers have just started work at Sauce
> Labs, and this may affect their availability.
  That is the news I was looking for.
>> 3)Is the jython community "bound to" the python community?
>>   I.E. I don't think python is going to "go away", what happens if
>> 	jython development "stalls".
>> 
> The PSF has already once provided a grant to keep Jython moving forward
> when it looked like it might stall. I don't know whether this is
> inevitable in the future, but *I* think Jython should be kept in the
> mainstream.
 Ditto.
>> 4)If someone in this community would consider a java scripting language
>> other than jython, what would it be? And why?
>> 
> Pass.
 <grin>. I've looked at clojure and kawa since I have a comfort level
 with lisp dialects, but clojure seems pretty proprietory (and thus
 exotic). kawa advertises that it complies with the general scheme
 specification. And I'm a little leery about the 'exotic' since I
 already use two 'exotic' server - side languages.

>> 5)Are there issues installing and deploying jython on shared webservers?
>>   I.E. Assuming that a dedicated server is one that I have full access to and
>> 	can install what I please, and a shared server would not afford me
>> 	such access; is there any trend for "server farms" to install jython?
>
> I don't know. A survey of Python-friendly hosting companies would be
> useful. You could use
  Not really a big deal with me, as I work primarily with dedicated
	servers, but ....
>   http://wiki.python.org/moin/PythonHosting
 Not much there. I will look further, given time,
 I note the googling "jython friendly hostings" shows this
 thread at the top :)

 I appreciate the reply.
 thanks
-- 
Tim 
tim at johnsons-web.com
http://www.akwebsoft.com


From christos.jonathan.hayward at gmail.com  Mon Mar 29 15:41:15 2010
From: christos.jonathan.hayward at gmail.com (Jonathan Hayward)
Date: Mon, 29 Mar 2010 12:41:15 -0700 (PDT)
Subject: "Usability, the Soul of Python"
Message-ID: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>

I've posted "Usability, the Soul of Python: An Introduction to the
Python Programming Language Through the Eyes of Usability", at:

   http://JonathansCorner.com/python/

The basic suggestion is that much of what works well in Python has
something to do with the usability it offers programmers.

Enjoy.

--
Jonathan Hayward, christos.jonathan.hayward at gmail.com
An Orthodox Christian author: theology, literature, et cetera.
My award-winning collection is available for free reading online:
I invite you to visit my main site at http://JonathansCorner.com/


From phlip2005 at gmail.com  Mon Mar 29 15:45:39 2010
From: phlip2005 at gmail.com (Phlip)
Date: Mon, 29 Mar 2010 12:45:39 -0700 (PDT)
Subject: "Usability, the Soul of Python"
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
Message-ID: <d4b5e0f4-8942-4640-9f0f-9f96a9df6d14@r27g2000yqn.googlegroups.com>

Jonathan Hayward wrote:

> I've posted "Usability, the Soul of Python: An Introduction to the
> Python Programming Language Through the Eyes of Usability", at:
>
> ? ?http://JonathansCorner.com/python/
>
> The basic suggestion is that much of what works well in Python has
> something to do with the usability it offers programmers.

You mean like...

  Order.has_many :line_items

?

Oops, sorry, wrong language. My bad!

--
  Phlip
  http://zeekland.zeroplayer.com/


From saimapk81 at gmail.com  Mon Mar 29 16:07:59 2010
From: saimapk81 at gmail.com (saima81)
Date: Mon, 29 Mar 2010 13:07:59 -0700 (PDT)
Subject: "jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
	saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
	saudi telecom" "saudi arabia jobs "on
	http://jobsinsaudiarabia-net.blogspot.com/
Message-ID: <26910518-73d6-4fd8-8cdb-9bc862d58beb@a4g2000prb.googlegroups.com>

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saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
saudi telecom" "saudi arabia jobs "on http://jobsinsaudiarabia-net.blogspot.com/
"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
saudi telecom" "saudi arabia jobs "on http://jobsinsaudiarabia-net.blogspot.com/
"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
saudi telecom" "saudi arabia jobs "on http://jobsinsaudiarabia-net.blogspot.com/
"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
saudi telecom" "saudi arabia jobs "on http://jobsinsaudiarabia-net.blogspot.com/
"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
saudi telecom" "saudi arabia jobs "on http://jobsinsaudiarabia-net.blogspot.com/
"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
saudi telecom" "saudi arabia jobs "on http://jobsinsaudiarabia-net.blogspot.com/
"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
saudi telecom" "saudi arabia jobs "on http://jobsinsaudiarabia-net.blogspot.com/
"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
saudi telecom" "saudi arabia jobs "on http://jobsinsaudiarabia-net.blogspot.com/
"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
saudi telecom" "saudi arabia jobs "on http://jobsinsaudiarabia-net.blogspot.com/
"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
saudi telecom" "saudi arabia jobs "on http://jobsinsaudiarabia-net.blogspot.com/
"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
saudi telecom" "saudi arabia jobs "on http://jobsinsaudiarabia-net.blogspot.com/
"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
saudi telecom" "saudi arabia jobs "on http://jobsinsaudiarabia-net.blogspot.com/
"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
saudi telecom" "saudi arabia jobs "on http://jobsinsaudiarabia-net.blogspot.com/
"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
saudi telecom" "saudi arabia jobs "on http://jobsinsaudiarabia-net.blogspot.com/
"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
saudi telecom" "saudi arabia jobs "on http://jobsinsaudiarabia-net.blogspot.com/
"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
saudi telecom" "saudi arabia jobs "on http://jobsinsaudiarabia-net.blogspot.com/
"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
saudi telecom" "saudi arabia jobs "on http://jobsinsaudiarabia-net.blogspot.com/
"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
saudi telecom" "saudi arabia jobs "on http://jobsinsaudiarabia-net.blogspot.com/
"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
saudi telecom" "saudi arabia jobs "on http://jobsinsaudiarabia-net.blogspot.com/
"jobs in saudi arabia" "jobs in saudi arabia for pakistanis" "jobs in
saudi arabia banks" "jobs in saudi" "jobs in saudi airline" "jobs in
saudi telecom" "saudi arabia jobs "on http://jobsinsaudiarabia-net.blogspot.com/


From stefan_ml at behnel.de  Mon Mar 29 16:14:22 2010
From: stefan_ml at behnel.de (Stefan Behnel)
Date: Mon, 29 Mar 2010 22:14:22 +0200
Subject: =?windows-1252?Q?Re=3A_I=27m_looking_for_html_cleaner=2E?=
	=?windows-1252?Q?_Example_=3A_convert_=3Ch1=3E=3Cspan=3E=3Cfont=3E?=
	=?windows-1252?Q?my_title=3C/font=3E=3C/span=3E=3C/h1=3E_=3D=3E_=3C?=
	=?windows-1252?Q?h1=3Emy_title=3C/h1=3E=85?=
In-Reply-To: <hopncq$gqk$1@dough.gmane.org>
References: <hopncq$gqk$1@dough.gmane.org>
Message-ID: <hor1mu$mgi$1@dough.gmane.org>

St?phane Klein, 29.03.2010 10:12:
> I work on HTML cleaner.
>
> I export OpenOffice.org documents to HTML.
> Next, I would like clean this HTML export files :
>
> * remove comment
> * remove style
> * remove dispensable tag
> * ...
>
> some difficulty :
>
> * convert <p>my text <span>foo</span> bar</p> => <p>my text foo par</p>
> * convert <h1><span><font>my title</font></span></h1> => <h1>my title</h1>
>
> to do this process, I use lxml and pyquery.

lxml.html has tools for that in the 'clean' module. Just specify the list 
of tags that you want to discard.


> * are there some xml helper tools in Python to do this process ? I've
> looked for in pypi, I found nothing about it

The HTML tools in the standard library are close to non-existant. You can 
achieve some things with the builtin tools, but if they fail for a 
particular input document, there's little you can do.


> If you confirm than this tools don't exists, I'll maybe publish a helper
> package to do this "clean" processing.

Take a look at lxml.html.clean first.

Stefan



From g.bogle at auckland.no.spam.ac.nz  Mon Mar 29 18:31:14 2010
From: g.bogle at auckland.no.spam.ac.nz (Gib Bogle)
Date: Tue, 30 Mar 2010 11:31:14 +1300
Subject: OT: Meaning of "monkey"
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
	<hoikqe$qcu$1@reader1.panix.com>
Message-ID: <hor9nh$nrh$3@speranza.aioe.org>

I prefer to think of myself as a code-ape - I look down on code-monkeys.


From steve at REMOVE-THIS-cybersource.com.au  Mon Mar 29 19:19:28 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 29 Mar 2010 23:19:28 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
Message-ID: <4bb13580$0$8827$c3e8da3@news.astraweb.com>

On Mon, 29 Mar 2010 07:40:54 -0700, Patrick Maupin wrote:

> On Mar 28, 9:45?pm, Steven D'Aprano
> <ste... at REMOVE.THIS.cybersource.com.au> wrote:
>> And what about tuples? And subclasses of list/tuples? How many
>> different types need to be optimized?
> 
> One of the beautiful things about Python is that, for most things, there
> are few surprises for even new users.  "There should be one obvious way
> to do it" for the user means that, sometimes, under the hood, there are
> a lot of special cases for the implementers.

It never ceases to amaze me how often people simply don't understand this.

"There should be one obvious way to do it" is the opposite of "NO obvious 
way", not of "many ways which may or may not be obvious". The complete 
quote from the Zen makes that clear:

There should be one-- and preferably ONLY one --obvious way to do it.
[Emphasis added]

And don't forget the next line:

Although that way may not be obvious at first unless you're Dutch.

Python is under no compulsion to make "the obvious way" obvious to anyone 
except Guido. It's a bonus if it happens to be obvious to newbies, not a 
requirement.

And besides, what is "it" you're talking about?

* Adding integers, decimals or fractions, or floats with a low
  requirement for precision and accuracy? Use sum.

* Adding floats with a high requirement for precision and accuracy? 
  Use math.fsum.

* Concatenating strings? Use ''.join.

* Joining lists? Use [].extend.

* Iterating over an arbitrary sequence of arbitrary sequences? 
  Use itertools.chain.

That's five different "its", and five obvious ways to do them.


>> In practical terms, does anyone actually ever use sum on more than a
>> handful of lists? I don't believe this is more than a hypothetical
>> problem.
> 
> Right now, it's probably not, because when somebody sums a large list
> and gets thwacked on the head by the lack of efficiency, they then come
> here and get thwacked because "everybody knows" they should user
> itertools or something else; not sum().

Exactly. If you're adding a large number of large lists, you're already 
doing it wrong. Making sum more efficient is just a band aid.


>> The primary use case for sum is adding numbers when floating point
>> accuracy is not critical. If you need float accuracy, use math.fsum.
> 
> See, I think the very existence of math.fsum() already violates "there
> should be one obvious way to do it."

How does the existence of math.fsum contradict the existence of sum?




-- 
Steven


From tdelaney at avaya.com  Mon Mar 29 19:35:43 2010
From: tdelaney at avaya.com (Delaney, Timothy (Tim))
Date: Tue, 30 Mar 2010 07:35:43 +0800
Subject: Super() function
In-Reply-To: <op.vacfyghqx6zn5v@lepton.softlabbsas.com.ar>
References: <4BAAD5E0.9050604@googlemail.com><op.u93uq1jyx6zn5v@gabriel.sleipnir-bsas><4BAE359F.6090200@googlemail.com><E4C7BCAB1872014F81CEAACD25699B8C01A49E87@301081ANEX2.global.avaya.com>
	<op.vacfyghqx6zn5v@lepton.softlabbsas.com.ar>
Message-ID: <E4C7BCAB1872014F81CEAACD25699B8C01A4A085@301081ANEX2.global.avaya.com>

Gabriel Genellina write:

> En Sun, 28 Mar 2010 21:58:07 -0300, Delaney, Timothy (Tim) <tdelaney at avaya.com> escribi?:
>>> Gabriel Genellina wrote:
>>>> Alan Harris-Reid <aharrisreid at googlemail.com> escribi?:
>>>>
>>>>> Using Python 3.1, I sometimes use the super() function to call the 
>>>>> equivalent method from a parent class, for example
>>>>>
>>>>> def mymethod(self):
>>>>>     super().mymethod()
>>>>>     some more code...
>>>>
>>>> This recipe does what you want:
>>>> http://code.activestate.com/recipes/286195-selfsuper/
>> If you think the pure-python version of the recipe is complicated, you 
>> should have a look at the performance-optimised Pyrex version ;)
>
> Where can we look at it? The link in the activestate recipe does not work anymore :(

You're right - I've changed ISPs. I'll have to find somewhere else to upload it and change the link. Can't do it today unfortunately.

Tim Delaney


From no.email at nospam.invalid  Mon Mar 29 19:36:17 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Mon, 29 Mar 2010 16:36:17 -0700
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
	<4bb13580$0$8827$c3e8da3@news.astraweb.com>
Message-ID: <7xtyryitu6.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
> * Iterating over an arbitrary sequence of arbitrary sequences? 
>   Use itertools.chain.

chain is only for finite sequences.  For arbitrary sequences,
use chain.from_iterable. 


From steve at REMOVE-THIS-cybersource.com.au  Mon Mar 29 19:38:53 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 29 Mar 2010 23:38:53 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
	<069f41e7-6a4a-4a40-b570-2559ca5ce69d@x11g2000prb.googlegroups.com>
Message-ID: <4bb13a0c$0$8827$c3e8da3@news.astraweb.com>

On Mon, 29 Mar 2010 08:12:00 -0700, Steve Howell wrote:

> On Mar 29, 7:40?am, Patrick Maupin <pmau... at gmail.com> wrote:
>> On Mar 28, 9:45?pm, Steven D'Aprano
>>
>> <ste... at REMOVE.THIS.cybersource.com.au> wrote:
>> > And what about tuples? And subclasses of list/tuples? How many
>> > different types need to be optimized?
>>
>> One of the beautiful things about Python is that, for most things,
>> there are few surprises for even new users. ?"There should be one
>> obvious way to do it" for the user means that, sometimes, under the
>> hood, there are a lot of special cases for the implementers.
>>
>>
> If nothing else, I think it's reasonably for users to expect symmetry.

Why? What is symmetry in programming?

Since the + operator takes both numbers and lists, and the - operator 
doesn't, does "symmetry" require that we make up some list operation so 
that integers and lists are symmetrical?


> If you can use "+" to concatentate lists, then it seems reasonable that
> something spelled "sum" would concatenate lists as well, and in
> reasonable time.

Where do you get the "reasonable time" from? A *single* + on lists can be 
slooooow. Try this:

L = [None]*10**9
result = L+L

(assuming you've even got enough memory to do so)

With a very few exceptions (e.g. dict lookup being "usually" O(1), list 
append being amortized O(1)), Python makes no promises about performance. 
It's not part of the language. If you, the programmer, are making any 
assumptions about performance that aren't clearly and explicitly 
documented in the official docs, then YOU are at fault, not Python.


>> > In practical terms, does anyone actually ever use sum on more than a
>> > handful of lists? I don't believe this is more than a hypothetical
>> > problem.
>>
>> Right now, it's probably not, because when somebody sums a large list
>> and gets thwacked on the head by the lack of efficiency, they then come
>> here and get thwacked because "everybody knows" they should user
>> itertools or something else; not sum().
>>
>>
> Indeed.  It would be nice if the docs for sum() at least pointed to
> list(itertools.chain(list_of_lists)), or whatever the most kosher
> alternative is supposed to be.
> 
> It only takes a handful of sublists, about ten on my box, to expose the
> limitation of the Shlemeil-the-Painter O(M*N*N) algorithm that's under
> the hood.  It only takes 200 sublists to start getting a 10x degradation
> in performance.

And how many times have you needed to add 200 sublists?

How many times have you needed to add 10 sublists?

Nobody has demonstrated that this is anything more than a hypothetical 
problem.


>> > The primary use case for sum is adding numbers when floating point
>> > accuracy is not critical. If you need float accuracy, use math.fsum.
>>
>> See, I think the very existence of math.fsum() already violates "there
>> should be one obvious way to do it."
>>
>>
> The nice thing about math.fsum() is that it is at least documented from
> sum(), although I suspect some users try sum() without even consulting
> the docs.
> 
> You could appease all users with an API where the most obvious choice,
> sum(), never behaves badly, and where users can still call more
> specialized versions (math.fsum() and friends) directly if they know
> what they are doing.  This goes back to the statement that Patrick
> makes--under the hood, this means more special cases for implementers,
> but fewer pitfalls for users.

More special cases for implementers means more bugs in the language, 
which means I end up writing my own code and ignoring the built-in 
version anyway.

More special cases means I have to pay the cost of high accuracy float 
summation even when I don't need, or want, it.

More special cases means I'm fooled into paying the cost of summing lists 
when I don't need to, because it's easier than importing itertools:

for item in sum(lots_of_lists):
    pass

needlessly creates a large list out of the smaller ones. Even if I don't 
fall for the temptation, and write bad code, I still pay the cost in the 
libraries and applications written by others.


More special cases isn't free. It's MORE costly than teaching users to 
use list.extend or itertools.chain.


-- 
Steven


From mensanator at aol.com  Mon Mar 29 19:59:58 2010
From: mensanator at aol.com (Mensanator)
Date: Mon, 29 Mar 2010 16:59:58 -0700 (PDT)
Subject: OT: Meaning of "monkey"
References: <0b0c8a0c-f62a-4cb4-9403-2af8ce5de9fb@35g2000yqm.googlegroups.com>
	<hoikqe$qcu$1@reader1.panix.com> <hor9nh$nrh$3@speranza.aioe.org>
Message-ID: <c63b5602-09b1-4415-9c09-ad968a02bda7@z35g2000yqd.googlegroups.com>

On Mar 29, 5:31?pm, Gib Bogle <g.bo... at auckland.no.spam.ac.nz> wrote:
> I prefer to think of myself as a code-ape - I look down on code-monkeys.

Why? They have prehensile tails.


From nagle at animats.com  Mon Mar 29 20:30:05 2010
From: nagle at animats.com (John Nagle)
Date: Mon, 29 Mar 2010 17:30:05 -0700
Subject: "Usability, the Soul of Python"
In-Reply-To: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
Message-ID: <4bb14173$0$1640$742ec2ed@news.sonic.net>

Jonathan Hayward wrote:
> I've posted "Usability, the Soul of Python: An Introduction to the
> Python Programming Language Through the Eyes of Usability", at:
> 
>    http://JonathansCorner.com/python/

    No, it's just a rather verbose introduction to Python, in dark brown
type on a light brown background.  One could write a good paper on this
topic, but this isn't it.

    By the same author: "The Case For Uncreative Web Design", which
has no examples.

				John Nagle


From nagle at animats.com  Mon Mar 29 20:35:09 2010
From: nagle at animats.com (John Nagle)
Date: Mon, 29 Mar 2010 17:35:09 -0700
Subject: =?windows-1252?Q?Re=3A_I=27m_looking_for_html_cleaner=2E?=
	=?windows-1252?Q?_Example_=3A_convert_=3Ch1=3E=3Cspan=3E=3Cfont=3E?=
	=?windows-1252?Q?my_title=3C/font=3E=3C/span=3E=3C/h1=3E_=3D=3E_=3C?=
	=?windows-1252?Q?h1=3Emy_title=3C/h1=3E=85?=
In-Reply-To: <mailman.1284.1269850345.23598.python-list@python.org>
References: <mailman.1284.1269850345.23598.python-list@python.org>
Message-ID: <4bb142a4$0$1669$742ec2ed@news.sonic.net>

St?phane Klein wrote:
> Hi,
> 
> I work on HTML cleaner.
> 
> I export OpenOffice.org documents to HTML.
> Next, I would like clean this HTML export files :
> 
> * remove comment
> * remove style
> * remove dispensable tag
> * ...

    Try parsing with HTML5 Parser ("http://code.google.com/p/html5lib/") which
is the closest thing to a good parser available for Python.  It's basically
a reference implementation of HTML5, including all the handling of bad HTML.

    Once you have a tree, write something to go through the tree and remove
empty tags from a list of tags which do nothing when empty.  Then
regenerate HTML from the tree.

    Or just use HTML Tidy: "http://www.w3.org/People/Raggett/tidy/"

					John Nagle


From lxkain at gmail.com  Mon Mar 29 20:54:26 2010
From: lxkain at gmail.com (LX)
Date: Mon, 29 Mar 2010 17:54:26 -0700 (PDT)
Subject: decorators only when __debug__ == True
Message-ID: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>

Hi all, I have a question about decorators. I would like to use them
for argument checking, and pre/post conditions. However, I don't want
the additional overhead when I run in non-debug mode. I could do
something like this, using a simple trace example.


@decorator
def pass_decorator(f, *args, **kw): # what about the slow-down that
incurs when using pass_decorator?
    return f(*args, **kw)

@decorator
def trace_decorator(f, *args, **kw):
    print "calling %s with args %s, %s" % (f.func_name, args, kw)
    return f(*args, **kw)

trace_enable_flag = False #__debug__
trace = trace_decorator if trace_enable_flag else pass_decorator


Trouble is, there is still an additional encapsulating function call.
Is there any way to eliminate the extra function call altogether?
Thanks in advance!


From brian at sweetapp.com  Mon Mar 29 21:23:12 2010
From: brian at sweetapp.com (Brian Quinlan)
Date: Mon, 29 Mar 2010 18:23:12 -0700
Subject: xml-rpc
In-Reply-To: <4B9C9AF9.80609@gmail.com>
References: <4B9C9AF9.80609@gmail.com>
Message-ID: <0590084D-BB4A-4D4E-B331-B7F486597A1A@sweetapp.com>


On Mar 14, 2010, at 12:14 AM, ahmet erdinc yilmaz wrote:

> Hello,
>
> Recenetly we are developing a senior project and decide to use  
> xmlrpclib.
> However I have some questions. In the documentation I could not find  
> any clue about
> handling requests? Does the server handles each request in a  
> separate thread? Or is
> there some queuing mechanism for client calls? Thanks in advance.

By default calls are processed serially. Look for ThreadingMixIn in:
http://docs.python.org/library/socketserver.html

And maybe read this too:
http://code.activestate.com/recipes/81549-a-simple-xml-rpc-server/

Cheers,
Brian

>
>
> --erdinc
> -- 
> http://mail.python.org/mailman/listinfo/python-list



From python at mrabarnett.plus.com  Mon Mar 29 21:34:27 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 30 Mar 2010 02:34:27 +0100
Subject: decorators only when __debug__ == True
In-Reply-To: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>
Message-ID: <4BB15523.4040901@mrabarnett.plus.com>

LX wrote:
> Hi all, I have a question about decorators. I would like to use them
> for argument checking, and pre/post conditions. However, I don't want
> the additional overhead when I run in non-debug mode. I could do
> something like this, using a simple trace example.
> 
> 
> @decorator
> def pass_decorator(f, *args, **kw): # what about the slow-down that
> incurs when using pass_decorator?
>     return f(*args, **kw)
> 
> @decorator
> def trace_decorator(f, *args, **kw):
>     print "calling %s with args %s, %s" % (f.func_name, args, kw)
>     return f(*args, **kw)
> 
> trace_enable_flag = False #__debug__
> trace = trace_decorator if trace_enable_flag else pass_decorator
> 
> 
> Trouble is, there is still an additional encapsulating function call.
> Is there any way to eliminate the extra function call altogether?
> Thanks in advance!

I think you have misunderstood certain details about decorators.

This code with a decorator:

     @decorator
     def hello():
         print "hello world"

basically does this:

     def hello():
         print "hello world"
     hello = decorator(hello)

so your non-decorator just needs to return the function it was passed:

     def pass_decorator(func):
         return func

and your trace decorator would be something like this:

     def trace_decorator(func):
         def show(*args, **kwargs):
             print "calling %s with args %s, %s" % (func.func_name, 
args, kwargs)
             result = func(*args, **kwargs)
             print "returning %s from %s" % (result, func.func_name)
             return result
         return show


From showell30 at yahoo.com  Mon Mar 29 22:05:30 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Mon, 29 Mar 2010 19:05:30 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au> 
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com> 
	<069f41e7-6a4a-4a40-b570-2559ca5ce69d@x11g2000prb.googlegroups.com> 
	<4bb13a0c$0$8827$c3e8da3@news.astraweb.com>
Message-ID: <bc431bd4-404d-4725-a96b-bbf00dba13bd@q23g2000yqd.googlegroups.com>

On Mar 29, 4:38?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Mon, 29 Mar 2010 08:12:00 -0700, Steve Howell wrote:
> > On Mar 29, 7:40?am, Patrick Maupin <pmau... at gmail.com> wrote:
> >> On Mar 28, 9:45?pm, Steven D'Aprano
>
> >> <ste... at REMOVE.THIS.cybersource.com.au> wrote:
> >> > And what about tuples? And subclasses of list/tuples? How many
> >> > different types need to be optimized?
>
> >> One of the beautiful things about Python is that, for most things,
> >> there are few surprises for even new users. ?"There should be one
> >> obvious way to do it" for the user means that, sometimes, under the
> >> hood, there are a lot of special cases for the implementers.
>
> > If nothing else, I think it's reasonably for users to expect symmetry.
>
> Why? What is symmetry in programming?

"Symmetry" is best shown by example.

 >>> 3 - 2
 1
 >>> set([1,2,3]) - set([2,3])
 set([1])

 >>> 5 * 3
 15
 >>> [1, 2, 3, 4, 5] * 3
 [1, 2, 3, 4, 5, 1, 2, 3, 4, 5, 1, 2, 3, 4, 5]

 >>> 1 + 2 + 3 + 4
 10
 >>> sum([1,2,3,4])
 10

 >>> [1,2] + [3,4]
 [1, 2, 3, 4]
 >>> sum([[1,2], [3,4]], [])
 [1, 2, 3, 4]

> Since the + operator takes both numbers and lists, and the - operator
> doesn't, does "symmetry" require that we make up some list operation so
> that integers and lists are symmetrical?
>

No.  Nobody is advocating for list subtraction.

> > If you can use "+" to concatentate lists, then it seems reasonable that
> > something spelled "sum" would concatenate lists as well, and in
> > reasonable time.
>
> Where do you get the "reasonable time" from?
>

>From common sense.  Concatenation of lists should be in O(M*N) time,
not O(M*N*N), because there is no need to build intermediate lists.

>
> With a very few exceptions (e.g. dict lookup being "usually" O(1), list
> append being amortized O(1)), Python makes no promises about performance.
> It's not part of the language. If you, the programmer, are making any
> assumptions about performance that aren't clearly and explicitly
> documented in the official docs, then YOU are at fault, not Python.

I'm not making any assumptions here.  I know that sum() is needlessly
slow for lists, even though it is not explicitly documented.

>
> > It only takes a handful of sublists, about ten on my box, to expose the
> > limitation of the Shlemeil-the-Painter O(M*N*N) algorithm that's under
> > the hood. ?It only takes 200 sublists to start getting a 10x degradation
> > in performance.
>
> And how many times have you needed to add 200 sublists?
>
> How many times have you needed to add 10 sublists?
>

Aggregating lists is a very common task in programming.  An example of
a list of lists would be a list of departments, where each department
is a list of employees.  If you want to sort the employees, you will
want to aggregate to a list.

> More special cases for implementers means more bugs in the language,
> which means I end up writing my own code and ignoring the built-in
> version anyway.
>

Special cases do not have to introduce bugs in the language.

> More special cases means I have to pay the cost of high accuracy float
> summation even when I don't need, or want, it.
>

Nothing about making sum() work for the general cases precludes more
specific, optimized functions.

> More special cases means I'm fooled into paying the cost of summing lists
> when I don't need to, because it's easier than importing itertools:

You don't have to be fooled.

> for item in sum(lots_of_lists):
> ? ? pass
>
> needlessly creates a large list out of the smaller ones.

Although this is a mostly harmless example, developers with common
sense would not sum lots of lists unless they expected to keep the
resulting list around for multiple operations, or for one operation,
like sort(), where you need to create a list for the subsequent
operation.

> Even if I don't
> fall for the temptation, and write bad code, I still pay the cost in the
> libraries and applications written by others.

You already pay the small price for polymorphism when you use Python.

> More special cases isn't free.

Nobody said they were.

> It's MORE costly than teaching users to
> use list.extend or itertools.chain.
>

Which the docs for sum() don't do.



From steven at REMOVE.THIS.cybersource.com.au  Mon Mar 29 22:11:09 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 30 Mar 2010 02:11:09 GMT
Subject: decorators only when __debug__ == True
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>
Message-ID: <pan.2010.03.30.02.11.09@REMOVE.THIS.cybersource.com.au>

On Mon, 29 Mar 2010 17:54:26 -0700, LX wrote:

> Hi all, I have a question about decorators. I would like to use them for
> argument checking, and pre/post conditions. However, I don't want the
> additional overhead when I run in non-debug mode. I could do something
> like this, using a simple trace example.


def decorator(func):
    if __debug__:
        @functools.wraps(func)
        def inner(*args, **kwargs):
            preprocess()
            result = func(*args, **kwargs)
            postprocess()
            return result
        return inner
    else:
        return func



-- 
Steven


From pmaupin at gmail.com  Mon Mar 29 22:24:42 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 29 Mar 2010 19:24:42 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au> 
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com> 
	<4bb13580$0$8827$c3e8da3@news.astraweb.com>
Message-ID: <31c7977e-9c8d-4be0-ae21-3c490e6364fe@z35g2000yqd.googlegroups.com>

On Mar 29, 6:19?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> How does the existence of math.fsum contradict the existence of sum?

You're exceptionally good at (probably deliberately) mis-interpreting
what people write.

Regards,
Pat


From pmaupin at gmail.com  Mon Mar 29 22:31:44 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 29 Mar 2010 19:31:44 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au> 
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com> 
	<069f41e7-6a4a-4a40-b570-2559ca5ce69d@x11g2000prb.googlegroups.com> 
	<4bb13a0c$0$8827$c3e8da3@news.astraweb.com>
Message-ID: <8dac78c8-124a-4b02-9944-6d577bfac84f@15g2000yqi.googlegroups.com>

On Mar 29, 6:38?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> With a very few exceptions (e.g. dict lookup being "usually" O(1), list
> append being amortized O(1)), Python makes no promises about performance.
> It's not part of the language. If you, the programmer, are making any
> assumptions about performance that aren't clearly and explicitly
> documented in the official docs, then YOU are at fault, not Python.

It's not about promises, guarantees, quid-pro-quo, etc.

It's about a lack of surprises.  Which, 99% of the time, Python excels
at.  This is why many of us program in Python.  This is why some of us
who would never use sum() on lists, EVEN IF IT WERE FIXED TO NOT BE SO
OBNOXIOUSLY SLOW, advocate that it, in fact, be fixed to not be so
obnoxiously slow.

BTW, it's also not about "fault".  There is no shame in writing a
Python program, seeing that it doesn't go fast enough, and then
hammering on it until it does.  There is also no shame in not reading
the docs before you write the program, although arguably (and you
obviously work very hard to help see to this) a great deal of shame
attaches to posting to the newsgroup before reading the docs.

Regards,
Pat


From showell30 at yahoo.com  Mon Mar 29 22:53:04 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Mon, 29 Mar 2010 19:53:04 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au> 
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com> 
	<4bb13580$0$8827$c3e8da3@news.astraweb.com>
Message-ID: <fea04f68-dfda-4ff5-8562-7a3e967fb732@y33g2000pre.googlegroups.com>

On Mar 29, 4:19?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Mon, 29 Mar 2010 07:40:54 -0700, Patrick Maupin wrote:
> > On Mar 28, 9:45?pm, Steven D'Aprano
> > <ste... at REMOVE.THIS.cybersource.com.au> wrote:
> >> And what about tuples? And subclasses of list/tuples? How many
> >> different types need to be optimized?
>
> > One of the beautiful things about Python is that, for most things, there
> > are few surprises for even new users. ?"There should be one obvious way
> > to do it" for the user means that, sometimes, under the hood, there are
> > a lot of special cases for the implementers.
>
> It never ceases to amaze me how often people simply don't understand this.
>
> "There should be one obvious way to do it" is the opposite of "NO obvious
> way", not of "many ways which may or may not be obvious". The complete
> quote from the Zen makes that clear:
>
> There should be one-- and preferably ONLY one --obvious way to do it.
> [Emphasis added]
>
> And don't forget the next line:
>
> Although that way may not be obvious at first unless you're Dutch.
>
> Python is under no compulsion to make "the obvious way" obvious to anyone
> except Guido. It's a bonus if it happens to be obvious to newbies, not a
> requirement.
>
> And besides, what is "it" you're talking about?
>
> * Adding integers, decimals or fractions, or floats with a low
> ? requirement for precision and accuracy? Use sum.
>
> * Adding floats with a high requirement for precision and accuracy?
> ? Use math.fsum.
>
> * Concatenating strings? Use ''.join.
>
> * Joining lists? Use [].extend.
>
> * Iterating over an arbitrary sequence of arbitrary sequences?
> ? Use itertools.chain.
>
> That's five different "its", and five obvious ways to do them.
>

Let's go through them...

> * Adding integers, decimals or fractions, or floats with a low
>   requirement for precision and accuracy? Use sum.
>

Pretty obvious.

 >>> sum([1, 2, 3])
 6



> * Adding floats with a high requirement for precision and accuracy?
>   Use math.fsum.
>

Mostly obvious.

 >>> fsum([1.234534665989, 2.987, 3])
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
 NameError: name 'fsum' is not defined
 >>> import math
 >>> math.fsum([1.234534665989, 2.987, 3])
 7.2215346659890001


> * Concatenating strings? Use ''.join.


Common pitfall:

 >>> ['abc', 'def', 'ghi'].join()
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
 AttributeError: 'list' object has no attribute 'join'
 >>> ''.join(['abc', 'def', 'ghi'])
 'abcdefghi'


> * Joining lists? Use [].extend.

Obvious, yes.  Convenient?  Not really.

 >>> start = []
 >>> for list in [[1, 2], [3, 4]]:
 ...   start.extend(list)
 ...
 >>> start
 [1, 2, 3, 4]

> * Iterating over an arbitrary sequence of arbitrary sequences?
>   Use itertools.chain.

 >>> group1 = ['al', 'bob']
 >>> group2 = ['cal']
 >>> groups = [group1, group2]

Obvious if you are Dutch...

 >>> itertools.chain(groups)
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
 NameError: name 'itertools' is not defined
 >>> import itertools
 >>> itertools.chain(groups)
 <itertools.chain object at 0x9a9658c>
 >>> len(itertools.chain(groups))
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
 TypeError: object of type 'itertools.chain' has no len()
 >>> len(list(itertools.chain(groups)))
 2
 >>> len(list(itertools.chain(*groups)))
 3

So you have sum, fsum, join, extend, and chain.

Sum is builtin, but you have to import fsum from math and chain from
itertools.

Join is actually a method on strings, not sequences.

Chain can take multiple lists, or you can use the splat operator on a
list of lists.

Extend is actually a method on lists, and it only takes one list, not
multiple ones.

 >>> [].extend(*groups)
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
 TypeError: extend() takes exactly one argument (2 given)

Just commit all that to memory, and enjoy the productivity of using a
high level language! ;)





From steven at REMOVE.THIS.cybersource.com.au  Mon Mar 29 23:01:03 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 30 Mar 2010 03:01:03 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
	<069f41e7-6a4a-4a40-b570-2559ca5ce69d@x11g2000prb.googlegroups.com>
	<4bb13a0c$0$8827$c3e8da3@news.astraweb.com>
	<bc431bd4-404d-4725-a96b-bbf00dba13bd@q23g2000yqd.googlegroups.com>
Message-ID: <pan.2010.03.30.03.01.03@REMOVE.THIS.cybersource.com.au>

On Mon, 29 Mar 2010 19:05:30 -0700, Steve Howell wrote:

>> > If nothing else, I think it's reasonably for users to expect
>> > symmetry.
>>
>> Why? What is symmetry in programming?
> 
> "Symmetry" is best shown by example.
> 
>  >>> 3 - 2
>  1
>  >>> set([1,2,3]) - set([2,3])
>  set([1])


That's a useless example.


>>> 42 - 10
32
>>> set([42]) - set([10])
set([42])


You don't define symmetry. You don't even give a sensible example of 
symmetry. Consequently I reject your argument that because sum is the 
obvious way to sum a lot of integers, "symmetry" implies that it should 
be the obvious way to concatenate a lot of lists.


>>> 1+2
3
>>> [1] + [2]
[1, 2]
>>> set([1]) + set([2])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for +: 'set' and 'set'


>> > If you can use "+" to concatentate lists, then it seems reasonable
>> > that something spelled "sum" would concatenate lists as well, and in
>> > reasonable time.
>>
>> Where do you get the "reasonable time" from?
>>
>>
> From common sense.  Concatenation of lists should be in O(M*N) time, not
> O(M*N*N), because there is no need to build intermediate lists.

You are correct that building intermediate lists isn't *compulsory*, 
there are alternatives, but the alternatives themselves have costs. 
Complexity itself is a cost. sum currently has nice simple semantics, 
which means you can reason about it: sum(sequence, start) is the same as 

total = start
for item in sequence:
    total = total + start
return total

You don't have to care what the items in sequence are, you don't have to 
make assumptions about what methods sequence and start have (beyond 
supporting iteration and addition). Adding special cases to sum means it 
becomes more complex and harder to reason about. If you pass some other 
sequence type in the middle of a bunch of lists, what will happen? Will 
sum suddenly break, or perhaps continue to work but inefficiently?

You still need to ask these questions with existing sum, but it is 
comparatively easy to answer them: you only need to consider how the 
alternative behaves when added to a list. You don't have to think about 
the technicalities of the sum algorithm itself -- sometimes it calls +, 
sometimes extend, sometimes +=, sometimes something else... which of the 
various different optimized branches will I fall into this time? Who 
knows? sum already has two branches. In my opinion, three branches is one 
too many.


[...]
>> > It only takes a handful of sublists, about ten on my box, to expose
>> > the limitation of the Shlemeil-the-Painter O(M*N*N) algorithm that's
>> > under the hood. ?It only takes 200 sublists to start getting a 10x
>> > degradation in performance.
>>
>> And how many times have you needed to add 200 sublists?
>>
>> How many times have you needed to add 10 sublists?
>>
>>
> Aggregating lists is a very common task in programming.  

"Aggregating" lists? Not summing them? I think you've just undercut your 
argument that sum is the "obvious" way of concatenating lists.

In natural language, we don't talk about "summing" lists, we talk about 
joining, concatenating or aggregating them. You have just done it 
yourself, and made my point for me. And this very thread started because 
somebody wanted to know what the equivalent to sum for sequences.

If sum was the obvious way to concatenate sequences, this thread wouldn't 
even exist.


> An example of a
> list of lists would be a list of departments, where each department is a
> list of employees.  If you want to sort the employees, you will want to
> aggregate to a list.

I grant you that 10 departments is likely to be a borderline case, but if 
you have 200 departments, then you will most likely be querying a 
database and getting back a single list of employees. And if you're not, 
you probably should be.


>> More special cases for implementers means more bugs in the language,
>> which means I end up writing my own code and ignoring the built-in
>> version anyway.
>>
>>
> Special cases do not have to introduce bugs in the language.

They don't *have* to, but since even Donald Knuth has written code with 
bugs in it, it is a safe bet that the number of bugs in code written by 
mere mortals will be roughly proportional to the complexity: more complex 
means more bugs. You can go to the bank with that.


>> More special cases means I have to pay the cost of high accuracy float
>> summation even when I don't need, or want, it.
>>
>>
> Nothing about making sum() work for the general cases precludes more
> specific, optimized functions.

You have missed my point. If I call your version of sum which all the 
special cases, I pay the overhead of the complexity regardless of whether 
I need it or not. The existence of other functions which duplicate the 
special cases in sum is irrelevant.



[...]
>> It's MORE costly than teaching users to use list.extend or
>> itertools.chain.
>>
>>
> Which the docs for sum() don't do.

Patches are always welcome.




-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Mon Mar 29 23:02:25 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 30 Mar 2010 03:02:25 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
	<4bb13580$0$8827$c3e8da3@news.astraweb.com>
	<7xtyryitu6.fsf@ruckus.brouhaha.com>
Message-ID: <pan.2010.03.30.03.02.25@REMOVE.THIS.cybersource.com.au>

On Mon, 29 Mar 2010 16:36:17 -0700, Paul Rubin wrote:

> Steven D'Aprano <steve at REMOVE-THIS-cybersource.com.au> writes:
>> * Iterating over an arbitrary sequence of arbitrary sequences?
>>   Use itertools.chain.
> 
> chain is only for finite sequences.  For arbitrary sequences, use
> chain.from_iterable.

Correction noted. Obviously I'm not Dutch.


-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Mon Mar 29 23:29:11 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 30 Mar 2010 03:29:11 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
	<4bb13580$0$8827$c3e8da3@news.astraweb.com>
	<31c7977e-9c8d-4be0-ae21-3c490e6364fe@z35g2000yqd.googlegroups.com>
Message-ID: <pan.2010.03.30.03.29.11@REMOVE.THIS.cybersource.com.au>

On Mon, 29 Mar 2010 19:24:42 -0700, Patrick Maupin wrote:

> On Mar 29, 6:19?pm, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
>> How does the existence of math.fsum contradict the existence of sum?
> 
> You're exceptionally good at (probably deliberately) mis-interpreting
> what people write.

I cannot read your mind, I can only interpret the words you choose to 
write. You said 

[quote]
See, I think the very existence of math.fsum() already violates "there 
should be one obvious way to do it."
[end quote]


If sum satisfies the existence of one obvious way, how does math.fsum 
violate it? sum exists, and is obvious, regardless of whatever other 
solutions exist as well.



-- 
Steven


From pmaupin at gmail.com  Mon Mar 29 23:33:14 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Mon, 29 Mar 2010 20:33:14 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au> 
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com> 
	<4bb13580$0$8827$c3e8da3@news.astraweb.com>
	<31c7977e-9c8d-4be0-ae21-3c490e6364fe@z35g2000yqd.googlegroups.com>
	<pan.2010.03.30.03.29.11@REMOVE.THIS.cybersource.com.au>
Message-ID: <559a2ee3-fb2c-477f-a444-7edbb6da8676@r1g2000yqj.googlegroups.com>

On Mar 29, 10:29?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 29 Mar 2010 19:24:42 -0700, Patrick Maupin wrote:
> > On Mar 29, 6:19?pm, Steven D'Aprano <st... at REMOVE-THIS-
> > cybersource.com.au> wrote:
> >> How does the existence of math.fsum contradict the existence of sum?
>
> > You're exceptionally good at (probably deliberately) mis-interpreting
> > what people write.
>
> I cannot read your mind, I can only interpret the words you choose to
> write. You said
>
> [quote]
> See, I think the very existence of math.fsum() already violates "there
> should be one obvious way to do it."
> [end quote]
>
> If sum satisfies the existence of one obvious way, how does math.fsum
> violate it? sum exists, and is obvious, regardless of whatever other
> solutions exist as well.

Because sum() is the obvious way to sum floats; now the existence of
math.fsum() means there are TWO obvious ways to sum floats.  Is that
really that hard to understand?  How can you misconstrue this so badly
that you write something that can be (easily) interpreted to mean that
you think that I think that once math.fsum() exists, sum() doesn't
even exist any more????


From showell30 at yahoo.com  Mon Mar 29 23:34:17 2010
From: showell30 at yahoo.com (Steve Howell)
Date: Mon, 29 Mar 2010 20:34:17 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au> 
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com> 
	<069f41e7-6a4a-4a40-b570-2559ca5ce69d@x11g2000prb.googlegroups.com> 
	<4bb13a0c$0$8827$c3e8da3@news.astraweb.com>
	<bc431bd4-404d-4725-a96b-bbf00dba13bd@q23g2000yqd.googlegroups.com>
	<pan.2010.03.30.03.01.03@REMOVE.THIS.cybersource.com.au>
Message-ID: <3c7ed32c-201f-41c8-bd46-4bf3092a3d6f@x12g2000yqx.googlegroups.com>

On Mar 29, 8:01?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> You don't define symmetry. You don't even give a sensible example of
> symmetry. Consequently I reject your argument that because sum is the
> obvious way to sum a lot of integers, "symmetry" implies that it should
> be the obvious way to concatenate a lot of lists.
>

You are not rejecting my argument; you are rejecting an improper
paraphrase of my argument.

My argument was that repeated use of "+" is spelled "sum" for
integers, so it's natural to expect the same name for repeated use of
"+" on lists.  Python already allows for this symmetry, just SLOWLY.

>
> You are correct that building intermediate lists isn't *compulsory*,
> there are alternatives, but the alternatives themselves have costs.
> Complexity itself is a cost. sum currently has nice simple semantics,
> which means you can reason about it: sum(sequence, start) is the same as
>
> total = start
> for item in sequence:
> ? ? total = total + start
> return total
>

I could just as reasonably expect these semantics:

 total = start
 for item in sequence:
   total += start
 return total

Python does not contradict my expectations here:

 >>> start = []
 >>> x = sum([], start)
 >>> x.append(1)
 >>> start
 [1]

> You don't have to care what the items in sequence are, you don't have to
> make assumptions about what methods sequence and start have (beyond
> supporting iteration and addition).

The only additional assumption I'm making is that Python can take
advantage of in-place addition, which is easy to introspect.

> Adding special cases to sum means it
> becomes more complex and harder to reason about. If you pass some other
> sequence type in the middle of a bunch of lists, what will happen? Will
> sum suddenly break, or perhaps continue to work but inefficiently?

This is mostly a red herring, as I would tend to use sum() on
sequences of homogenous types.

Python already gives me the power to shoot myself in the foot for
strings.

 >>> list = [1, 2]
 >>> list += "foo"
 >>> list
 [1, 2, 'f', 'o', 'o']

 >>> lst = [1,2]
 >>> lst.extend('foo')
 >>> lst
 [1, 2, 'f', 'o', 'o']

I'd prefer to get an exception for cases where += would do the same.

>>> start = []
>>> bogus_example = [[1, 2], None, [3]]
>>> for item in bogus_example: start += item
...
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'NoneType' object is not iterable



> You still need to ask these questions with existing sum, but it is
> comparatively easy to answer them: you only need to consider how the
> alternative behaves when added to a list. You don't have to think about
> the technicalities of the sum algorithm itself -- sometimes it calls +,
> sometimes extend, sometimes +=, sometimes something else

I would expect sum() to support the same contract as +=, which already
works for numerics (so no backward incompatibility), and which already
works for lists.  For custom-designed classes, I would rely on the
promise that augmented assignment falls back to normal methods.

> ... which of the
> various different optimized branches will I fall into this time? Who
> knows? sum already has two branches. In my opinion, three branches is one
> too many.

As long as it falls into the branch that works, I'm happy. :)

>
> "Aggregating" lists? Not summing them? I think you've just undercut your
> argument that sum is the "obvious" way of concatenating lists.
>
> In natural language, we don't talk about "summing" lists, we talk about
> joining, concatenating or aggregating them. You have just done it
> yourself, and made my point for me.

Nor do you use "chain" or "extend."

> And this very thread started because
> somebody wanted to know what the equivalent to sum for sequences.
>
> If sum was the obvious way to concatenate sequences, this thread wouldn't
> even exist.

This thread is entitled "sum for sequences."  I think you just made my
point.



From steven at REMOVE.THIS.cybersource.com.au  Mon Mar 29 23:49:46 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 30 Mar 2010 03:49:46 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
	<069f41e7-6a4a-4a40-b570-2559ca5ce69d@x11g2000prb.googlegroups.com>
	<4bb13a0c$0$8827$c3e8da3@news.astraweb.com>
	<8dac78c8-124a-4b02-9944-6d577bfac84f@15g2000yqi.googlegroups.com>
Message-ID: <pan.2010.03.30.03.49.46@REMOVE.THIS.cybersource.com.au>

On Mon, 29 Mar 2010 19:31:44 -0700, Patrick Maupin wrote:

> It's about a lack of surprises.  Which, 99% of the time, Python excels
> at.  This is why many of us program in Python.  This is why some of us
> who would never use sum() on lists, EVEN IF IT WERE FIXED TO NOT BE SO
> OBNOXIOUSLY SLOW, advocate that it, in fact, be fixed to not be so
> obnoxiously slow.

As I said, patches are welcome. Personally, I expect that it would be 
rejected, but that's not my decision to make, and who knows, perhaps I'm 
wrong and you'll have some of the Python-Dev people support your idea.

sum is not designed to work with lists. It happens to work because lists 
happen to use + for concatenation, and because it is too much trouble for 
too little benefit to explicitly exclude lists in the same way sum 
explicitly excludes strings. In the Python philosophy, simplicity of 
implementation is a virtue: the code that is not there contributes 
exactly no bugs and has precisely no overhead.

sum has existed as a Python built-in for many years -- by memory, since 
Python 2.2, which was nearly nine years ago. Unlike the serious gotcha of 
repeated string concatenation:


# DO NOT DO THIS
result = ""
for s in items:
    result += s


which *does* cause real problems in real code, I don't believe that there 
have been any significant problems caused by summing lists of lists. As 
problems go, it is such a minor one that it isn't worth this discussion, 
let alone fixing it. But if anyone disagrees, this is open source, go 
ahead and fix it. You don't need my permission.



-- 
Steven


From gagsl-py2 at yahoo.com.ar  Tue Mar 30 00:00:16 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 30 Mar 2010 01:00:16 -0300
Subject: GIF89A and PIL
References: <2010032618455468300-aptshansen@gmailinvalid>
	<87oci9hjz9.fsf@dpt-info.u-strasbg.fr>
	<2010032719445464825-aptshansen@gmailinvalid>
	<81b39uFggeU1@mid.individual.net>
Message-ID: <op.vac32qocx6zn5v@lepton.softlabbsas.com.ar>

En Mon, 29 Mar 2010 04:41:23 -0300, Gregory Ewing  
<greg.ewing at canterbury.ac.nz> escribi?:
> Stephen Hansen wrote:
>
>> So I wonder if there's just some hyper-optimization Photoshop does that  
>> PIL can't round-trip.
>
> You may find that PIL isn't bothering to compress at all,
> or only doing it in a very simpleminded way.

Indeed.
Fredrik Lundh, in  
http://mail.python.org/pipermail/image-sig/1998-July/000506.html

"When writing GIF files, PIL uses a simpleminded encoding that, by some
odd reason, LZW decoders have no trouble reading.  To write compressed
GIF files, there are a number of options:

     -- install NETPBM, and hack GifImagePlugin so it uses _save_ppm instead
        of _save (just remove "_ppm" from the latter).
     -- write an _imaging_gif module that takes a PIL image and writes
        a GIF version of it.  how you implement that is up to you..."

After twelve years the above comments are still applicable.

-- 
Gabriel Genellina



From gagsl-py2 at yahoo.com.ar  Tue Mar 30 00:36:52 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Tue, 30 Mar 2010 01:36:52 -0300
Subject: xpat error in xmlrp client. How to inspect data.
References: <4bab1f4a$0$25677$426a74cc@news.free.fr>
Message-ID: <op.vac5rqfxx6zn5v@lepton.softlabbsas.com.ar>

En Thu, 25 Mar 2010 05:31:05 -0300, News123 <news1234 at free.fr> escribi?:

> I'm havign a small xmlrpc client, which works normally fine.
> (xmlrpc via https)
>
> Sometimes however I receive an Exception about an expat error.
>
>
> The output, that I receive is:
>   File "C:\mycode\myrpcclient.py", line 63, in upload_chunk
>     rslt = myrpcclient.call()
>   File "C:\Python26\lib\xmlrpclib.py", line 1199, in __call__
>     return self.__send(self.__name, args)
>   File "C:\Python26\lib\xmlrpclib.py", line 1489, in __request
>     verbose=self.__verbose
>   File "C:\Python26\lib\xmlrpclib.py", line 1253, in request
>     return self._parse_response(h.getfile(), sock)
>   File "C:\Python26\lib\xmlrpclib.py", line 1387, in _parse_response
>     p.feed(response)
>   File "C:\Python26\lib\xmlrpclib.py", line 601, in feed
>     self._parser.Parse(data, 0)
> ExpatError: syntax error: line 1, column 0
>
>
> In order to continue debugging I'd like to dump the received http data,
> which "C:\Python26\lib\xmlrpclib.py", line 601 tried to parse without
> succes.
>
> How can I do this?

a) Use the standard cgitb module (despite its name, it is useful outside  
CGI scripts)

b) Use the tb module available from http://pypi.python.org/pypi/tb

Both provide a more verbose traceback, including local variables at each  
execution frame.

c) Replace ("monkey-patch") the feed() method with a more debug-friendly  
version:

def feed(self, data):
   try:
     self._parser.Parse(data, 0)
   except xmlrpclib.expat.ExpatError, e:
     e.args += (data,)
     raise

xmlrpclib.ExpatParser.feed = feed

(Or perhaps set e.data = data)

d) In your exception handler, walk the traceback object until you reach  
the feed() call, and inspect the corresponding tb_frame.f_locals  
dictionary.


-- 
Gabriel Genellina



From cs at zip.com.au  Tue Mar 30 00:41:11 2010
From: cs at zip.com.au (Cameron Simpson)
Date: Tue, 30 Mar 2010 15:41:11 +1100
Subject: GIF89A and PIL
In-Reply-To: <2010032719445464825-aptshansen@gmailinvalid>
References: <2010032719445464825-aptshansen@gmailinvalid>
Message-ID: <20100330044111.GA684@cskk.homeip.net>

On 27Mar2010 19:44, Stephen Hansen <apt.shansen at gmail.invalid> wrote:
| Yeah, I don't expect much from PNG. The images are very small but I
| might be sending a LOT of them over a pipe which is fairly tight, so
| 50-60 bytes matters. That's why I selected GIF.

How well does a stream of XPM files compress? Probably not enough, I
would guess. Just wondering.

Do you need to move a "standard" image format around? If everything's
16x16 8 bit colour (and if, with luck, they share a colour map) maybe
you can ship raw bytes expressing what you want.

How colourful are these GIFs?
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

What I want is Facts. Teach these boys and girls nothing but Facts.  Facts
alone are wanted in life. Plant nothing else, and root out everything else.
        - Charles Dickens    John Huffam   1812-1870  Hard Times [1854]


From kse.listed.co1 at gmail.com  Tue Mar 30 00:41:38 2010
From: kse.listed.co1 at gmail.com (Naeem)
Date: Mon, 29 Mar 2010 21:41:38 -0700 (PDT)
Subject: "jobs in saudi arabia universities" "jobs in saudi arabia for 
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	http://jobsinsaudiarabia-net.blogspot.com/
Message-ID: <fd2e1a35-02eb-4daf-afe2-ad78aacbd828@y11g2000prf.googlegroups.com>

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From vinni at altern.org  Tue Mar 30 01:47:40 2010
From: vinni at altern.org (Vincent MAILLE)
Date: Mon, 29 Mar 2010 22:47:40 -0700 (PDT)
Subject: PyScripter Logo
Message-ID: <9483843a-e855-4648-ae69-fef9e7006ffd@z3g2000yqz.googlegroups.com>

Hi,

Where can I find a image of the snake PyScipter in high quality ?

Thnaks,

Vincent


From steven at REMOVE.THIS.cybersource.com.au  Tue Mar 30 02:41:51 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 30 Mar 2010 06:41:51 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
	<4bb13580$0$8827$c3e8da3@news.astraweb.com>
	<fea04f68-dfda-4ff5-8562-7a3e967fb732@y33g2000pre.googlegroups.com>
Message-ID: <pan.2010.03.30.06.41.51@REMOVE.THIS.cybersource.com.au>

On Mon, 29 Mar 2010 19:53:04 -0700, Steve Howell wrote:

> On Mar 29, 4:19?pm, Steven D'Aprano <st... at REMOVE-THIS-
> cybersource.com.au> wrote:
[...]
>> Python is under no compulsion to make "the obvious way" obvious to
>> anyone except Guido. It's a bonus if it happens to be obvious to
>> newbies, not a requirement.
>>
>> And besides, what is "it" you're talking about?
>>
>> * Adding integers, decimals or fractions, or floats with a low
>> ? requirement for precision and accuracy? Use sum.
>>
>> * Adding floats with a high requirement for precision and accuracy?
>> ? Use math.fsum.
>>
>> * Concatenating strings? Use ''.join.
>>
>> * Joining lists? Use [].extend.
>>
>> * Iterating over an arbitrary sequence of arbitrary sequences?
>> ? Use itertools.chain.
>>
>> That's five different "its", and five obvious ways to do them.
>>
>>
> Let's go through them...

"Obvious" doesn't mean you don't have to learn the tools you use. It 
doesn't mean that there's no need to think about the requirements of your 
problem. It doesn't even mean that the way to do it has to be a built-in 
or pre-built solution in the standard library, or that somebody with no 
Python experience could intuit the correct function to use based on 
nothing more than a good grasp of English.

It certainly doesn't mean that users shouldn't be expected to know how to 
import a module:


>  >>> fsum([1.234534665989, 2.987, 3])
>  Traceback (most recent call last):
>    File "<stdin>", line 1, in <module>
>  NameError: name 'fsum' is not defined

I called it math.fsum every time I referred to it. Did I need to specify 
that you have to import the math module first?


>> * Concatenating strings? Use ''.join.
> 
> 
> Common pitfall:
> 
>  >>> ['abc', 'def', 'ghi'].join()
>  Traceback (most recent call last):
>    File "<stdin>", line 1, in <module>
>  AttributeError: 'list' object has no attribute 'join'

Is it really common?

I've been hanging around this newsgroup for many years now, and I don't 
believe I've ever seen anyone confused by this. I've seen plenty of 
newbies use repeated string concatenation, but never anyone trying to do 
a string join and getting it wrong. If you have any links to threads 
showing such confusion, I'd be grateful to see them.


>> * Joining lists? Use [].extend.
> 
> Obvious, yes.  Convenient?  Not really.
> 
>  >>> start = []
>  >>> for list in [[1, 2], [3, 4]]:
>  ...   start.extend(list)
>  ...
>  >>> start
>  [1, 2, 3, 4]


Why isn't that convenient? It is an obvious algorithm written in three 
short lines. If you need a one-liner, write a function and call it:

concatenate_lists(sequence_of_lists)


 
>> * Iterating over an arbitrary sequence of arbitrary sequences?
>>   Use itertools.chain.
> 
>  >>> group1 = ['al', 'bob']
>  >>> group2 = ['cal']
>  >>> groups = [group1, group2]
> 
> Obvious if you are Dutch...

Or are familiar with the itertools module and the Pythonic practice of 
iterating over lazy sequences. Iterators and itertools are fundamental to 
the Pythonic way of doing things.



>  >>> itertools.chain(groups)
>  Traceback (most recent call last):
>    File "<stdin>", line 1, in <module>
>  NameError: name 'itertools' is not defined

That's the second time you've either mistakenly neglected to import a 
module, or deliberately not imported it to make the rhetorical point that 
you have to import a module before using it. Yes, you *do* have to import 
modules before using them. What's your point? Not everything has to be a 
built-in.



[...]
> Sum is builtin, but you have to import fsum from math and chain from
> itertools.
>
> Join is actually a method on strings, not sequences.

Is that supposed to be an argument against them?



[...]
> Just commit all that to memory, and enjoy the productivity of using a
> high level language! ;)

If you don't know your tools, you will spend your life hammering screws 
in with the butt of your saw. It will work, for some definition of work. 
Giving saws heavier, stronger handles to make it faster to hammer screws 
is not what I consider good design.



-- 
Steven


From no.email at nospam.invalid  Tue Mar 30 02:55:55 2010
From: no.email at nospam.invalid (Paul Rubin)
Date: Mon, 29 Mar 2010 23:55:55 -0700
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
	<4bb13580$0$8827$c3e8da3@news.astraweb.com>
	<fea04f68-dfda-4ff5-8562-7a3e967fb732@y33g2000pre.googlegroups.com>
	<pan.2010.03.30.06.41.51@REMOVE.THIS.cybersource.com.au>
Message-ID: <7xr5n2i9hg.fsf@ruckus.brouhaha.com>

Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
>>>> ...
>>> ...
>> ...
> "Obvious" doesn't mean you don't have to learn the tools you use....

Geez you guys, get a room ;-).  You're all good programmers with too
much experience for this arguing over stuff this silly.


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From: loveguruworld7 at gmail.com (love guru 4 world)
Date: Tue, 30 Mar 2010 00:05:01 -0700 (PDT)
Subject: Watch Angelina Jolie's sex scandal videos at her house
Message-ID: <67a85379-1f60-4028-b812-4650fb3fc719@a16g2000pre.googlegroups.com>

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From keeloh at rocketmail.com  Tue Mar 30 03:33:01 2010
From: keeloh at rocketmail.com (POOJA)
Date: Tue, 30 Mar 2010 00:33:01 -0700 (PDT)
Subject: Help Desk Software by PerlDesk
Message-ID: <e688d5ce-162e-4536-8ba9-d3b24b27afbe@k24g2000pro.googlegroups.com>

Help Desk Software by PerlDesk
------------------------

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From chris at simplistix.co.uk  Tue Mar 30 04:03:00 2010
From: chris at simplistix.co.uk (Chris Withers)
Date: Tue, 30 Mar 2010 09:03:00 +0100
Subject: PyDispatcher on sourceforge doesn't play nice with easy_install
Message-ID: <4BB1B034.9020905@simplistix.co.uk>

Hi All,

Using easy_install to get PyDispatcher results in:

Searching for PyDispatcher
Reading http://pypi.python.org/simple/PyDispatcher/
Reading http://pydispatcher.sourceforge.net
Reading https://sourceforge.net/project/showfiles.php?group_id=79755
Reading http://sourceforge.net/projects/pydispatcher/files/pydispatcher/
Best match: PyDispatcher 2.0.1
Downloading 
http://sourceforge.net/projects/pydispatcher/files/pydispatcher/2.0.1/PyDispatcher-2.0.1-py2.5.egg/download
Processing download
error: Couldn't find a setup script in /tmp/easy_install-ioAdEo/download

Who's the maintainer of PyDispatcher nowadays? Would be handy if they 
removed the sourceforge link from pypi.

In the meantime, the following works around the problem:

easy_install PyDispatcher -H *.python.org

cheers,

Chris



From steven at REMOVE.THIS.cybersource.com.au  Tue Mar 30 04:06:09 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 30 Mar 2010 08:06:09 GMT
Subject: PyScripter Logo
References: <9483843a-e855-4648-ae69-fef9e7006ffd@z3g2000yqz.googlegroups.com>
Message-ID: <pan.2010.03.30.08.06.08@REMOVE.THIS.cybersource.com.au>

On Mon, 29 Mar 2010 22:47:40 -0700, Vincent MAILLE wrote:

> Where can I find a image of the snake PyScipter in high quality ?

Did you mean PyScripter (note spelling)? If so, then googling for 
PyScripter brings me to the PyScripter project, which has contact 
details. You should ask the project author.


-- 
Steven


From jeanmichel at sequans.com  Tue Mar 30 05:03:06 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Tue, 30 Mar 2010 11:03:06 +0200
Subject: "Usability, the Soul of Python"
In-Reply-To: <4bb14173$0$1640$742ec2ed@news.sonic.net>
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
	<4bb14173$0$1640$742ec2ed@news.sonic.net>
Message-ID: <4BB1BE4A.50407@sequans.com>

John Nagle wrote:
> Jonathan Hayward wrote:
>> I've posted "Usability, the Soul of Python: An Introduction to the
>> Python Programming Language Through the Eyes of Usability", at:
>>
>>    http://JonathansCorner.com/python/
>
>    No, it's just a rather verbose introduction to Python, in dark brown
> type on a light brown background.  One could write a good paper on this
> topic, but this isn't it.
>
>
>                 John Nagle
Why is it bad ?

JM


From steve at REMOVE-THIS-cybersource.com.au  Tue Mar 30 06:10:55 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 30 Mar 2010 10:10:55 GMT
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
	<4bb13580$0$8827$c3e8da3@news.astraweb.com>
	<fea04f68-dfda-4ff5-8562-7a3e967fb732@y33g2000pre.googlegroups.com>
	<pan.2010.03.30.06.41.51@REMOVE.THIS.cybersource.com.au>
	<7xr5n2i9hg.fsf@ruckus.brouhaha.com>
Message-ID: <4bb1ce2e$0$8827$c3e8da3@news.astraweb.com>

On Mon, 29 Mar 2010 23:55:55 -0700, Paul Rubin wrote:

> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
>>>>> ...
>>>> ...
>>> ...
>> "Obvious" doesn't mean you don't have to learn the tools you use....
> 
> Geez you guys, get a room ;-).  You're all good programmers with too
> much experience for this arguing over stuff this silly.

Yes Mum ;)


You're right of course. I spend too much time being this guy:

http://xkcd.com/386/

and not enough this one:

http://xkcd.com/167/


-- 
Steven


From am8734200 at gmail.com  Tue Mar 30 06:19:33 2010
From: am8734200 at gmail.com (a m)
Date: Tue, 30 Mar 2010 03:19:33 -0700 (PDT)
Subject: It's a fact not lost on the opportunity to see yourself
Message-ID: <49471fea-67f2-476a-93cf-1e9f9eabfcb7@i25g2000yqm.googlegroups.com>

http://www.google.com/url?sa=D&q=http://www.google.com/url%3Fsa%3DD%26q%3Dhttp://osamah2000.jeeran.com/daauageralmuslmeen1.htm%26usg%3DAFQjCNGQhhGz-1TGv9Y7gE8zKwHHustJCg&usg=AFQjCNH5ZzXRqkh5EGL1dsjQxcjNQCmAEQ


From malte.usenet at web.de  Tue Mar 30 07:17:21 2010
From: malte.usenet at web.de (Malte Dik)
Date: Tue, 30 Mar 2010 13:17:21 +0200
Subject: "Usability, the Soul of Python"
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
	<4bb14173$0$1640$742ec2ed@news.sonic.net>
	<mailman.1300.1269939807.23598.python-list@python.org>
Message-ID: <81e4u2F7ubU1@mid.dfncis.de>

> Why is it bad ?
> 

Not working code, examples, that are weird to read, and a lot of text :)




From lie.1296 at gmail.com  Tue Mar 30 07:23:32 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Tue, 30 Mar 2010 22:23:32 +1100
Subject: StringChain -- a data structure for managing large sequences
	ofchunks of bytes
In-Reply-To: <4baf6ec6$0$8756$c3e8da3@news.astraweb.com>
References: <mailman.646.1268377905.23598.python-list@python.org>	<4b9a00ce$0$27822$c3e8da3@news.astraweb.com>	<mailman.1055.1269234593.23598.python-list@python.org>	<pan.2010.03.22.08.07.48@REMOVE.THIS.cybersource.com.au>	<4bae6130$1@dnews.tpgi.com.au>
	<4baf6ec6$0$8756$c3e8da3@news.astraweb.com>
Message-ID: <4bb1df60$1@dnews.tpgi.com.au>

On 03/29/2010 01:59 AM, Steven D'Aprano wrote:
> On Sun, 28 Mar 2010 06:48:21 +1100, Lie Ryan wrote:
> 
>> On 03/22/2010 07:07 PM, Steven D'Aprano wrote:
>>> Perhaps you should have said that it was a wrapper around deque giving
>>> richer functionality, rather than giving the impression that it was a
>>> brand new data structure invented by you. People are naturally going to
>>> be more skeptical about a newly invented data structure than one based
>>> on a reliable, component like deque.
>>
>> Well, technically StringChain is not a data structure in the first
>> place. StringChain is a string;
> 
> And strings are data structures, as are arrays and structs. Just because 
> they're simple data structures made directly from primitives rather than 
> rich, complex structures, doesn't mean they're not data structures.

Array is a way to structure data and thus a data structure; array is the
concept of structuring data using contiguous memory with elements
addressed by an index. string is just a contiguous memory reserved to
store data, or in other words: string is an array. This is what I meant
when I said string is not itself a data structure.

>> a string that is implemented using deque
>> data structure to make appending algorithmically efficient. It is not a
>> data structure, in the sense that I can't put arbitrary "thing" into the
>> data structure. 
> 
> Any "thing" that can be pickled or serialised can be put into a string.

Fair enough, you're right to think so but IMHO I disagree. Streams (or
perhaps 'blob' to avoid the connotation of FIFO) are the data structure
which you can put anything pickleable/serialisable into, but string (the
implementation of stream/blob using array) are just a special case of
array data structure and not a different, separate data structure than
array.

Perhaps I should not make such a bold claim as saying string is not data
structure; what I have in mind is that string is just a special case of
array and not distinctly separate data structure than array.


From steve at holdenweb.com  Tue Mar 30 07:33:37 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 30 Mar 2010 07:33:37 -0400
Subject: sum for sequences?
In-Reply-To: <4bb1ce2e$0$8827$c3e8da3@news.astraweb.com>
References: <hodb43$pt$1@reader1.panix.com>	<7x1vf91f60.fsf@ruckus.brouhaha.com>	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>	<hoo1k4$cia$1@news.eternal-september.org>	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>	<4bb13580$0$8827$c3e8da3@news.astraweb.com>	<fea04f68-dfda-4ff5-8562-7a3e967fb732@y33g2000pre.googlegroups.com>	<pan.2010.03.30.06.41.51@REMOVE.THIS.cybersource.com.au>	<7xr5n2i9hg.fsf@ruckus.brouhaha.com>
	<4bb1ce2e$0$8827$c3e8da3@news.astraweb.com>
Message-ID: <4BB1E191.9040909@holdenweb.com>

Steven D'Aprano wrote:
> On Mon, 29 Mar 2010 23:55:55 -0700, Paul Rubin wrote:
> 
>> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
>>>>>> ...
>>>>> ...
>>>> ...
>>> "Obvious" doesn't mean you don't have to learn the tools you use....
>> Geez you guys, get a room ;-).  You're all good programmers with too
>> much experience for this arguing over stuff this silly.
> 
> Yes Mum ;)
> 
> 
> You're right of course. I spend too much time being this guy:
> 
> http://xkcd.com/386/
> 
> and not enough this one:
> 
> http://xkcd.com/167/
> 
> 
Yeah, it can happen to all of us. I've certainly been "that guy" too.
But Steven, surely now it's time to *show us the squirrels*

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/


From steve at holdenweb.com  Tue Mar 30 07:33:37 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 30 Mar 2010 07:33:37 -0400
Subject: sum for sequences?
In-Reply-To: <4bb1ce2e$0$8827$c3e8da3@news.astraweb.com>
References: <hodb43$pt$1@reader1.panix.com>	<7x1vf91f60.fsf@ruckus.brouhaha.com>	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>	<hoo1k4$cia$1@news.eternal-september.org>	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>	<4bb13580$0$8827$c3e8da3@news.astraweb.com>	<fea04f68-dfda-4ff5-8562-7a3e967fb732@y33g2000pre.googlegroups.com>	<pan.2010.03.30.06.41.51@REMOVE.THIS.cybersource.com.au>	<7xr5n2i9hg.fsf@ruckus.brouhaha.com>
	<4bb1ce2e$0$8827$c3e8da3@news.astraweb.com>
Message-ID: <4BB1E191.9040909@holdenweb.com>

Steven D'Aprano wrote:
> On Mon, 29 Mar 2010 23:55:55 -0700, Paul Rubin wrote:
> 
>> Steven D'Aprano <steven at REMOVE.THIS.cybersource.com.au> writes:
>>>>>> ...
>>>>> ...
>>>> ...
>>> "Obvious" doesn't mean you don't have to learn the tools you use....
>> Geez you guys, get a room ;-).  You're all good programmers with too
>> much experience for this arguing over stuff this silly.
> 
> Yes Mum ;)
> 
> 
> You're right of course. I spend too much time being this guy:
> 
> http://xkcd.com/386/
> 
> and not enough this one:
> 
> http://xkcd.com/167/
> 
> 
Yeah, it can happen to all of us. I've certainly been "that guy" too.
But Steven, surely now it's time to *show us the squirrels*

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From lie.1296 at gmail.com  Tue Mar 30 07:39:41 2010
From: lie.1296 at gmail.com (Lie Ryan)
Date: Tue, 30 Mar 2010 22:39:41 +1100
Subject: Classes as namespaces?
In-Reply-To: <52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
References: <hoihgt$p6t$1@reader1.panix.com>
	<69463be0-d839-43cf-a8a7-1cc9081f672d@r27g2000yqn.googlegroups.com>
	<52ae180e-b959-41c9-b5a5-f09944364367@b33g2000yqc.googlegroups.com>
Message-ID: <4bb1e329$1@dnews.tpgi.com.au>

On 03/27/2010 10:28 PM, Jonathan Hartley wrote:
> one might like to name the complex block of logic, just to make it
> readable:
> 
> 
> x = 1
> def account_for_non_square_pixels(x):
>    ((some complex logic))
> account_for_non_square_pixels()
> y = 2
> 
> 
> But defining and then calling the function like that is a tad
> cumbersome. So I was wondering about:
> 


I never liked the narrow definition of function as "reusable piece of
code". This narrow definition implies that a piece of code used only
once do not need to be made a function.

I would rather define function as "a logically independent piece of
code" and encourage refactorizing code into functions even if they are
only used once as long as they are conceptually a "step" and being able
to reuse code as a nice side-effect of it.

Under this definition, the "some complex logic" conceptually is an
independent piece of code that can (and probably should) be factorized.


From alfps at start.no  Tue Mar 30 07:40:22 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Tue, 30 Mar 2010 13:40:22 +0200
Subject: "Usability, the Soul of Python"
In-Reply-To: <mailman.1300.1269939807.23598.python-list@python.org>
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>	<4bb14173$0$1640$742ec2ed@news.sonic.net>
	<mailman.1300.1269939807.23598.python-list@python.org>
Message-ID: <hosnrh$6na$1@news.eternal-september.org>

* Jean-Michel Pichavant:
> John Nagle wrote:
>> Jonathan Hayward wrote:
>>> I've posted "Usability, the Soul of Python: An Introduction to the
>>> Python Programming Language Through the Eyes of Usability", at:
>>>
>>>    http://JonathansCorner.com/python/
>>
>>    No, it's just a rather verbose introduction to Python, in dark brown
>> type on a light brown background.  One could write a good paper on this
>> topic, but this isn't it.
>>
>>
>>                 John Nagle
> Why is it bad ?

Consider


<quote>
 From a usability standpoint, the braces go with the lines to print out the 
stanza rather than the for statement or the code after, so the following is best:

for(i = 99; i > 0; ++i)
     {
     printf("%d slabs of spam in my mail!\n", i);
     printf("%d slabs of spam,\n", i);
     printf("Send one to abuse and Just Hit Delete,\n");
     printf("%d slabs of spam in my mail!\n\n", i + 1);
     }
</quote>


This is just unsubstantiated opinion, but worse, it makes a tacit assumption 
that there is "best" way to do indentation. However, most programmers fall into 
that trap, and I've done it myself. In fact, when I worked as a consultant (then 
in Andersen Consulting, now Accenture) I used the style above. Petter 
Hesselberg, author of "Industrial Strength Windows Programming" (heh, I'm 
mentioned) asked my why on Earth I did that, like, nobody does that? It was a 
habit I'd picked up in Pascal, from very na?ve considerations of parse nesting 
levels, a kind of misguided idealism instead of more practical pragmatism, but 
since I realized that that was an incredibly weak argument I instead answered by 
pointing towards Charles Petzold's code in his "Programming Windows" books. And 
amazingly I was allowed to continue using this awkward and impractical style.

I may or may not have been responsible for the similarly impractical compromise 
convention of using three spaces per indentation level. At least, in one big 
meeting the question about number of spaces was raised by the speaker, and I 
replied from the benches, just in jest, "three!". And that was it (perhaps).


Cheers,

- Alf  (admitting to earlier mistakes)


From contact at xavierho.com  Tue Mar 30 08:11:05 2010
From: contact at xavierho.com (Xavier Ho)
Date: Tue, 30 Mar 2010 22:11:05 +1000
Subject: "Usability, the Soul of Python"
In-Reply-To: <hosnrh$6na$1@news.eternal-september.org>
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
	<4bb14173$0$1640$742ec2ed@news.sonic.net>
	<mailman.1300.1269939807.23598.python-list@python.org> 
	<hosnrh$6na$1@news.eternal-september.org>
Message-ID: <2d56febf1003300511h617d7487t1bee6f69c6722a17@mail.gmail.com>

Did no one notice that

for(i = 99; i > 0; ++i)

Gives you an infinite loop (sort of) because i starts a 99, and increases
every loop?

Cheers,

Ching-Yun Xavier Ho, Technical Artist

Contact Information
Mobile: (+61) 04 3335 4748
Skype ID: SpaXe85
Email: contact at xavierho.com
Website: http://xavierho.com/


On Tue, Mar 30, 2010 at 9:40 PM, Alf P. Steinbach <alfps at start.no> wrote:

> * Jean-Michel Pichavant:
>
>> John Nagle wrote:
>>
>>> Jonathan Hayward wrote:
>>>
>>>> I've posted "Usability, the Soul of Python: An Introduction to the
>>>> Python Programming Language Through the Eyes of Usability", at:
>>>>
>>>>   http://JonathansCorner.com/python/
>>>>
>>>
>>>   No, it's just a rather verbose introduction to Python, in dark brown
>>> type on a light brown background.  One could write a good paper on this
>>> topic, but this isn't it.
>>>
>>>
>>>                John Nagle
>>>
>> Why is it bad ?
>>
>
> Consider
>
>
> <quote>
> From a usability standpoint, the braces go with the lines to print out the
> stanza rather than the for statement or the code after, so the following is
> best:
>
> for(i = 99; i > 0; ++i)
>    {
>    printf("%d slabs of spam in my mail!\n", i);
>    printf("%d slabs of spam,\n", i);
>    printf("Send one to abuse and Just Hit Delete,\n");
>    printf("%d slabs of spam in my mail!\n\n", i + 1);
>    }
> </quote>
>
>
> This is just unsubstantiated opinion, but worse, it makes a tacit
> assumption that there is "best" way to do indentation. However, most
> programmers fall into that trap, and I've done it myself. In fact, when I
> worked as a consultant (then in Andersen Consulting, now Accenture) I used
> the style above. Petter Hesselberg, author of "Industrial Strength Windows
> Programming" (heh, I'm mentioned) asked my why on Earth I did that, like,
> nobody does that? It was a habit I'd picked up in Pascal, from very na?ve
> considerations of parse nesting levels, a kind of misguided idealism instead
> of more practical pragmatism, but since I realized that that was an
> incredibly weak argument I instead answered by pointing towards Charles
> Petzold's code in his "Programming Windows" books. And amazingly I was
> allowed to continue using this awkward and impractical style.
>
> I may or may not have been responsible for the similarly impractical
> compromise convention of using three spaces per indentation level. At least,
> in one big meeting the question about number of spaces was raised by the
> speaker, and I replied from the benches, just in jest, "three!". And that
> was it (perhaps).
>
>
> Cheers,
>
> - Alf  (admitting to earlier mistakes)
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From steve at holdenweb.com  Tue Mar 30 09:46:20 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 30 Mar 2010 09:46:20 -0400
Subject: StringChain -- a data structure for managing large sequences
	ofchunks of bytes
In-Reply-To: <4bb1df60$1@dnews.tpgi.com.au>
References: <mailman.646.1268377905.23598.python-list@python.org>	<4b9a00ce$0$27822$c3e8da3@news.astraweb.com>	<mailman.1055.1269234593.23598.python-list@python.org>	<pan.2010.03.22.08.07.48@REMOVE.THIS.cybersource.com.au>	<4bae6130$1@dnews.tpgi.com.au>	<4baf6ec6$0$8756$c3e8da3@news.astraweb.com>
	<4bb1df60$1@dnews.tpgi.com.au>
Message-ID: <hosvbe$meu$1@dough.gmane.org>

Lie Ryan wrote:
> On 03/29/2010 01:59 AM, Steven D'Aprano wrote:
>> On Sun, 28 Mar 2010 06:48:21 +1100, Lie Ryan wrote:
>>
>>> On 03/22/2010 07:07 PM, Steven D'Aprano wrote:
>>>> Perhaps you should have said that it was a wrapper around deque giving
>>>> richer functionality, rather than giving the impression that it was a
>>>> brand new data structure invented by you. People are naturally going to
>>>> be more skeptical about a newly invented data structure than one based
>>>> on a reliable, component like deque.
>>> Well, technically StringChain is not a data structure in the first
>>> place. StringChain is a string;
>> And strings are data structures, as are arrays and structs. Just because 
>> they're simple data structures made directly from primitives rather than 
>> rich, complex structures, doesn't mean they're not data structures.
> 
> Array is a way to structure data and thus a data structure; array is the
> concept of structuring data using contiguous memory with elements
> addressed by an index. string is just a contiguous memory reserved to
> store data, or in other words: string is an array. This is what I meant
> when I said string is not itself a data structure.
> 
>>> a string that is implemented using deque
>>> data structure to make appending algorithmically efficient. It is not a
>>> data structure, in the sense that I can't put arbitrary "thing" into the
>>> data structure. 
>> Any "thing" that can be pickled or serialised can be put into a string.
> 
> Fair enough, you're right to think so but IMHO I disagree. Streams (or
> perhaps 'blob' to avoid the connotation of FIFO) are the data structure
> which you can put anything pickleable/serialisable into, but string (the
> implementation of stream/blob using array) are just a special case of
> array data structure and not a different, separate data structure than
> array.
> 
> Perhaps I should not make such a bold claim as saying string is not data
> structure; what I have in mind is that string is just a special case of
> array and not distinctly separate data structure than array.

While this may be true conceptually it's certainly not true in Python
(and in Python you need to be careful to distinguish between lists and
arrays, since it does have both types).

>From the point of view of the language, strings are primitives. But
every Python implementation uses a data structure to store them, and the
 structure is definitely not the same as is used to store lists, or
arrays (which in Python are container types, whereas the string isn't
because the individual indexable elements are immutable).

As always, it's better to seek common ground than pick the nits: I don't
think that there's really that much difference between your approach and
Steven's, but he's a well-known nit-picker (and we are *sometimes*
grateful for it).

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From mwilson at the-wire.com  Tue Mar 30 09:53:52 2010
From: mwilson at the-wire.com (Mel)
Date: Tue, 30 Mar 2010 09:53:52 -0400
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com>
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com>
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au>
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com>
	<4bb13580$0$8827$c3e8da3@news.astraweb.com>
	<31c7977e-9c8d-4be0-ae21-3c490e6364fe@z35g2000yqd.googlegroups.com>
	<pan.2010.03.30.03.29.11@REMOVE.THIS.cybersource.com.au>
	<559a2ee3-fb2c-477f-a444-7edbb6da8676@r1g2000yqj.googlegroups.com>
Message-ID: <hosvlq$do0$1@speranza.aioe.org>

Patrick Maupin wrote:

> Because sum() is the obvious way to sum floats; now the existence of
> math.fsum() means there are TWO obvious ways to sum floats.  Is that
> really that hard to understand?  How can you misconstrue this so badly
> that you write something that can be (easily) interpreted to mean that
> you think that I think that once math.fsum() exists, sum() doesn't
> even exist any more????

floats are nasty -- as evidence the recent thread on comparing floats for 
equality.  People use floats when they have to.  fsum exists because of 
this:

mwilson at tecumseth:~$ python
Python 2.6.2 (release26-maint, Apr 19 2009, 01:56:41) 
[GCC 4.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from math import fsum
>>> a=(1.0e200, 156.0, -1.0e200)
>>> sum(a)
0.0
>>> fsum(a)
156.0


You could generalize sum, but after that, there's a case that even fsum 
can't handle:


>>> ni=1.0e200+1.0j
>>> nj=1.0+1.0e200j
>>> ai=(ni, nj, 156.0+651.0j, -ni, -nj)
>>> sum(ai)
(-1+0j)
>>> fsum(ai)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: can't convert complex to float; use abs(z)
>>> 


	Mel.





From sccolbert at gmail.com  Tue Mar 30 10:25:54 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Tue, 30 Mar 2010 10:25:54 -0400
Subject: "Usability, the Soul of Python"
In-Reply-To: <2d56febf1003300511h617d7487t1bee6f69c6722a17@mail.gmail.com>
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
	<4bb14173$0$1640$742ec2ed@news.sonic.net>
	<mailman.1300.1269939807.23598.python-list@python.org>
	<hosnrh$6na$1@news.eternal-september.org>
	<2d56febf1003300511h617d7487t1bee6f69c6722a17@mail.gmail.com>
Message-ID: <7f014ea61003300725yf3dfcbdw2976160ca37f60f3@mail.gmail.com>

not really, the int will eventually overflow and cycle around ;)

On Tue, Mar 30, 2010 at 8:11 AM, Xavier Ho <contact at xavierho.com> wrote:

> Did no one notice that
>
>
> for(i = 99; i > 0; ++i)
>
> Gives you an infinite loop (sort of) because i starts a 99, and increases
> every loop?
>
> Cheers,
>
> Ching-Yun Xavier Ho, Technical Artist
>
> Contact Information
> Mobile: (+61) 04 3335 4748
> Skype ID: SpaXe85
> Email: contact at xavierho.com
> Website: http://xavierho.com/
>
>
>
> On Tue, Mar 30, 2010 at 9:40 PM, Alf P. Steinbach <alfps at start.no> wrote:
>
>> * Jean-Michel Pichavant:
>>
>>> John Nagle wrote:
>>>
>>>> Jonathan Hayward wrote:
>>>>
>>>>> I've posted "Usability, the Soul of Python: An Introduction to the
>>>>> Python Programming Language Through the Eyes of Usability", at:
>>>>>
>>>>>   http://JonathansCorner.com/python/
>>>>>
>>>>
>>>>   No, it's just a rather verbose introduction to Python, in dark brown
>>>> type on a light brown background.  One could write a good paper on this
>>>> topic, but this isn't it.
>>>>
>>>>
>>>>                John Nagle
>>>>
>>> Why is it bad ?
>>>
>>
>> Consider
>>
>>
>> <quote>
>> >From a usability standpoint, the braces go with the lines to print out
>> the stanza rather than the for statement or the code after, so the following
>> is best:
>>
>> for(i = 99; i > 0; ++i)
>>    {
>>    printf("%d slabs of spam in my mail!\n", i);
>>    printf("%d slabs of spam,\n", i);
>>    printf("Send one to abuse and Just Hit Delete,\n");
>>    printf("%d slabs of spam in my mail!\n\n", i + 1);
>>    }
>> </quote>
>>
>>
>> This is just unsubstantiated opinion, but worse, it makes a tacit
>> assumption that there is "best" way to do indentation. However, most
>> programmers fall into that trap, and I've done it myself. In fact, when I
>> worked as a consultant (then in Andersen Consulting, now Accenture) I used
>> the style above. Petter Hesselberg, author of "Industrial Strength Windows
>> Programming" (heh, I'm mentioned) asked my why on Earth I did that, like,
>> nobody does that? It was a habit I'd picked up in Pascal, from very na?ve
>> considerations of parse nesting levels, a kind of misguided idealism instead
>> of more practical pragmatism, but since I realized that that was an
>> incredibly weak argument I instead answered by pointing towards Charles
>> Petzold's code in his "Programming Windows" books. And amazingly I was
>> allowed to continue using this awkward and impractical style.
>>
>> I may or may not have been responsible for the similarly impractical
>> compromise convention of using three spaces per indentation level. At least,
>> in one big meeting the question about number of spaces was raised by the
>> speaker, and I replied from the benches, just in jest, "three!". And that
>> was it (perhaps).
>>
>>
>> Cheers,
>>
>> - Alf  (admitting to earlier mistakes)
>>
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>
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From bluemangroupie at gmail.com  Tue Mar 30 11:13:02 2010
From: bluemangroupie at gmail.com (aditya)
Date: Tue, 30 Mar 2010 08:13:02 -0700 (PDT)
Subject: Binary Decimals in Python
Message-ID: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>

To get the decimal representation of a binary number, I can just do
this:

int('11',2) # returns 3

But decimal binary numbers throw a ValueError:

int('1.1',2) # should return 1.5, throws error instead.

Is this by design? It seems to me that this is not the correct
behavior.

- Aditya


From anand.shashwat at gmail.com  Tue Mar 30 11:19:52 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Tue, 30 Mar 2010 20:49:52 +0530
Subject: Binary Decimals in Python
In-Reply-To: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
Message-ID: <d4ab53de1003300819l2892d134pe85244f19bd9959c@mail.gmail.com>

decimal binary number is not included AFAIK

On Tue, Mar 30, 2010 at 8:43 PM, aditya <bluemangroupie at gmail.com> wrote:

> To get the decimal representation of a binary number, I can just do
> this:
>
> int('11',2) # returns 3
>
> But decimal binary numbers throw a ValueError:
>
> int('1.1',2) # should return 1.5, throws error instead.
>
> Is this by design? It seems to me that this is not the correct
> behavior.
>
> - Aditya
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From pmaupin at gmail.com  Tue Mar 30 11:28:50 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Tue, 30 Mar 2010 08:28:50 -0700 (PDT)
Subject: Binary Decimals in Python
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
Message-ID: <4e7acb50-797f-4e19-a915-90724cf157fc@u22g2000yqf.googlegroups.com>

On Mar 30, 10:13?am, aditya <bluemangrou... at gmail.com> wrote:
> To get the decimal representation of a binary number, I can just do
> this:
>
> int('11',2) # returns 3
>
> But decimal binary numbers throw a ValueError:
>
> int('1.1',2) # should return 1.5, throws error instead.
>
> Is this by design? It seems to me that this is not the correct
> behavior.
>
> - Aditya

So, why should int('1.1', 2) throw an error when int('1.1') doesn't?

Regards,
Pat


From pmaupin at gmail.com  Tue Mar 30 11:31:25 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Tue, 30 Mar 2010 08:31:25 -0700 (PDT)
Subject: sum for sequences?
References: <hodb43$pt$1@reader1.panix.com>
	<7x1vf91f60.fsf@ruckus.brouhaha.com> 
	<1a715cad-6c6a-43d4-b708-a15538b2f27c@k36g2000prb.googlegroups.com> 
	<4baddb7b$0$27866$c3e8da3@news.astraweb.com>
	<ed8a57b5-6865-4383-8711-894d45d756a3@l24g2000prh.googlegroups.com>
	<Xns9D49A5BF95C33duncanbooth@127.0.0.1>
	<94640659-fbf6-436c-83e6-3fee9fcddb27@j16g2000prn.googlegroups.com>
	<hoo1k4$cia$1@news.eternal-september.org>
	<pan.2010.03.29.02.45.32@REMOVE.THIS.cybersource.com.au> 
	<35e10f7d-d7dc-4e4f-aa5a-8ba3ec5c0664@g10g2000yqh.googlegroups.com> 
	<4bb13580$0$8827$c3e8da3@news.astraweb.com>
	<31c7977e-9c8d-4be0-ae21-3c490e6364fe@z35g2000yqd.googlegroups.com>
	<pan.2010.03.30.03.29.11@REMOVE.THIS.cybersource.com.au>
	<559a2ee3-fb2c-477f-a444-7edbb6da8676@r1g2000yqj.googlegroups.com>
	<hosvlq$do0$1@speranza.aioe.org>
Message-ID: <9437e04d-b7ba-489e-9737-89cd1af41b40@k19g2000yqn.googlegroups.com>

On Mar 30, 8:53?am, Mel <mwil... at the-wire.com> wrote:
> floats are nasty -- as evidence the recent thread on comparing floats for
> equality. ?People use floats when they have to. ?fsum exists because of
> this:

...

I understand there are technical reasons for why math.fsum() exists.
I still think that whatever math.fsum() does should probably be a part
of sum().

Regards,
Pat


From kgo at grant-olson.net  Tue Mar 30 11:35:21 2010
From: kgo at grant-olson.net (Grant Olson)
Date: Tue, 30 Mar 2010 11:35:21 -0400
Subject: Binary Decimals in Python
In-Reply-To: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
Message-ID: <4BB21A39.1070102@grant-olson.net>

On 3/30/2010 11:13 AM, aditya wrote:
> To get the decimal representation of a binary number, I can just do
> this:
> 
> int('11',2) # returns 3
> 
> But decimal binary numbers throw a ValueError:
> 
> int('1.1',2) # should return 1.5, throws error instead.
> 
> Is this by design? It seems to me that this is not the correct
> behavior.
> 

Well technically that would be a 'radix point', not a decimal point.

But I think the problem is that computers don't store fractional values
that way internally.  They either use floating or fixed point math.  You
would never look at raw binary data on a computer and see something like
'1010.1010', and no one would write it that way, and no language (that I
know of) would accept that as a valid value if you did something like "x
= 0b1010.1010"

So in that sense, it might not be an intentional oversight, but it's not
a very practical or useful feature.


From benjamin.kaplan at case.edu  Tue Mar 30 11:37:36 2010
From: benjamin.kaplan at case.edu (Benjamin Kaplan)
Date: Tue, 30 Mar 2010 11:37:36 -0400
Subject: Binary Decimals in Python
In-Reply-To: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
Message-ID: <ec96e1391003300837w115716bemad2844697bc48291@mail.gmail.com>

On Tue, Mar 30, 2010 at 11:13 AM, aditya <bluemangroupie at gmail.com> wrote:
> To get the decimal representation of a binary number, I can just do
> this:
>
> int('11',2) # returns 3
>
> But decimal binary numbers throw a ValueError:
>
> int('1.1',2) # should return 1.5, throws error instead.
>
> Is this by design? It seems to me that this is not the correct
> behavior.
>
> - Aditya
> --

Because int stands for integer and 1.1 is not an integer. You get the
same error if you try doing int('1.1')

> http://mail.python.org/mailman/listinfo/python-list
>


From tibor.beck at hotmail.com  Tue Mar 30 11:40:56 2010
From: tibor.beck at hotmail.com (gentlestone)
Date: Tue, 30 Mar 2010 08:40:56 -0700 (PDT)
Subject: (a==b) ? 'Yes' : 'No'
Message-ID: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>

Hi, how can I write the popular C/JAVA syntax in Python?

Java example:
    return (a==b) ? 'Yes' : 'No'

My first idea is:
    return ('No','Yes')[bool(a==b)]

Is there a more elegant/common python expression for this?



From anand.shashwat at gmail.com  Tue Mar 30 11:43:39 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Tue, 30 Mar 2010 21:13:39 +0530
Subject: Binary Decimals in Python
In-Reply-To: <4BB21A39.1070102@grant-olson.net>
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
	<4BB21A39.1070102@grant-olson.net>
Message-ID: <d4ab53de1003300843n7fccd004qc7cca0b8c4e15cf5@mail.gmail.com>

The conversion is not supported for decimal integers AFAIK, however
'0b123.456' is always valid. I guess you can always get a decimal number
convertor onto Python-recipes



On Tue, Mar 30, 2010 at 9:05 PM, Grant Olson <kgo at grant-olson.net> wrote:

> On 3/30/2010 11:13 AM, aditya wrote:
> > To get the decimal representation of a binary number, I can just do
> > this:
> >
> > int('11',2) # returns 3
> >
> > But decimal binary numbers throw a ValueError:
> >
> > int('1.1',2) # should return 1.5, throws error instead.
> >
> > Is this by design? It seems to me that this is not the correct
> > behavior.
> >
>
> Well technically that would be a 'radix point', not a decimal point.
>
> But I think the problem is that computers don't store fractional values
> that way internally.  They either use floating or fixed point math.  You
> would never look at raw binary data on a computer and see something like
> '1010.1010', and no one would write it that way, and no language (that I
> know of) would accept that as a valid value if you did something like "x
> = 0b1010.1010"
>
> So in that sense, it might not be an intentional oversight, but it's not
> a very practical or useful feature.
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From mrmakent at cox.net  Tue Mar 30 11:44:23 2010
From: mrmakent at cox.net (Mike Kent)
Date: Tue, 30 Mar 2010 08:44:23 -0700 (PDT)
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
Message-ID: <034130b2-295b-4564-ac32-44de15d3f1c1@33g2000yqj.googlegroups.com>

On Mar 30, 11:40?am, gentlestone <tibor.b... at hotmail.com> wrote:
> Hi, how can I write the popular C/JAVA syntax in Python?
>
> Java example:
> ? ? return (a==b) ? 'Yes' : 'No'
>
> My first idea is:
> ? ? return ('No','Yes')[bool(a==b)]
>
> Is there a more elegant/common python expression for this?

return ('Yes' if a == b else 'No')


From python at rcn.com  Tue Mar 30 11:49:04 2010
From: python at rcn.com (Raymond Hettinger)
Date: Tue, 30 Mar 2010 08:49:04 -0700 (PDT)
Subject: Binary Decimals in Python
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
Message-ID: <24939652-22cb-47f1-97d5-3941463dd7b3@h27g2000yqm.googlegroups.com>

On Mar 30, 8:13?am, aditya <bluemangrou... at gmail.com> wrote:
> To get the decimal representation of a binary number, I can just do
> this:
>
> int('11',2) # returns 3
>
> But decimal binary numbers throw a ValueError:
>
> int('1.1',2) # should return 1.5, throws error instead.
>
> Is this by design? It seems to me that this is not the correct
> behavior.

The int() constructor returns integers.
So, look to float() for non-integral values.
Binary representation isn't supported yet,
but we do have hex:

    >>> float.fromhex('1.8')
    1.5


Raymond



From kgo at grant-olson.net  Tue Mar 30 11:51:49 2010
From: kgo at grant-olson.net (Grant Olson)
Date: Tue, 30 Mar 2010 11:51:49 -0400
Subject: Binary Decimals in Python
In-Reply-To: <d4ab53de1003300843n7fccd004qc7cca0b8c4e15cf5@mail.gmail.com>
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
	<4BB21A39.1070102@grant-olson.net>
	<d4ab53de1003300843n7fccd004qc7cca0b8c4e15cf5@mail.gmail.com>
Message-ID: <4BB21E15.60507@grant-olson.net>

Doh!

Well the problem is that int's are integers.  So yeah, you can't even do
that with normal value "int ('2.1')" will also throw an error.  And
floats don't support radix conversion, because no-one really writes
numbers that way.  (At least computer programmers...)


On 3/30/2010 11:43 AM, Shashwat Anand wrote:
> The conversion is not supported for decimal integers AFAIK, however
> '0b123.456' is always valid. I guess you can always get a decimal number
> convertor onto Python-recipes
> 
> 
> 
> On Tue, Mar 30, 2010 at 9:05 PM, Grant Olson <kgo at grant-olson.net
> <mailto:kgo at grant-olson.net>> wrote:
> 
>     On 3/30/2010 11:13 AM, aditya wrote:
>     > To get the decimal representation of a binary number, I can just do
>     > this:
>     >
>     > int('11',2) # returns 3
>     >
>     > But decimal binary numbers throw a ValueError:
>     >
>     > int('1.1',2) # should return 1.5, throws error instead.
>     >
>     > Is this by design? It seems to me that this is not the correct
>     > behavior.
>     >
> 
>     Well technically that would be a 'radix point', not a decimal point.
> 
>     But I think the problem is that computers don't store fractional values
>     that way internally.  They either use floating or fixed point math.  You
>     would never look at raw binary data on a computer and see something like
>     '1010.1010', and no one would write it that way, and no language (that I
>     know of) would accept that as a valid value if you did something like "x
>     = 0b1010.1010"
> 
>     So in that sense, it might not be an intentional oversight, but it's not
>     a very practical or useful feature.
>     --
>     http://mail.python.org/mailman/listinfo/python-list
> 
> 



From python at mrabarnett.plus.com  Tue Mar 30 11:54:08 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 30 Mar 2010 16:54:08 +0100
Subject: Binary Decimals in Python
In-Reply-To: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
Message-ID: <4BB21EA0.5060306@mrabarnett.plus.com>

aditya wrote:
> To get the decimal representation of a binary number, I can just do
> this:
> 
> int('11',2) # returns 3
> 
> But decimal binary numbers throw a ValueError:
> 
> int('1.1',2) # should return 1.5, throws error instead.
> 
> Is this by design? It seems to me that this is not the correct
> behavior.
> 
int() returns an integer (hence the name!), so it should never return a
float anyway.

What you want is for float() to accept a base, but that is rarely
needed.


From bluemangroupie at gmail.com  Tue Mar 30 11:54:43 2010
From: bluemangroupie at gmail.com (aditya)
Date: Tue, 30 Mar 2010 08:54:43 -0700 (PDT)
Subject: Binary Decimals in Python
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
	<mailman.1312.1269963469.23598.python-list@python.org>
Message-ID: <e378ec78-2de6-4d72-9f7c-13b93b88d69c@30g2000yqi.googlegroups.com>

On Mar 30, 10:37?am, Benjamin Kaplan <benjamin.kap... at case.edu> wrote:
> On Tue, Mar 30, 2010 at 11:13 AM, aditya <bluemangrou... at gmail.com> wrote:
> > To get the decimal representation of a binary number, I can just do
> > this:
>
> > int('11',2) # returns 3
>
> > But decimal binary numbers throw a ValueError:
>
> > int('1.1',2) # should return 1.5, throws error instead.
>
> > Is this by design? It seems to me that this is not the correct
> > behavior.
>
> > - Aditya
> > --
>
> Because int stands for integer and 1.1 is not an integer. You get the
> same error if you try doing int('1.1')
>
> >http://mail.python.org/mailman/listinfo/python-list
>
>

That makes sense. The closest thing I've found is this question on
StackOverflow: http://stackoverflow.com/questions/1592158/python-convert-hex-to-float

It seems to me that adding a conversion feature to floats would be a
lot more intuitive.


From mcfletch at vrplumber.com  Tue Mar 30 11:56:08 2010
From: mcfletch at vrplumber.com (Mike C. Fletcher)
Date: Tue, 30 Mar 2010 11:56:08 -0400
Subject: PyDispatcher on sourceforge doesn't play nice with easy_install
In-Reply-To: <4BB1B034.9020905@simplistix.co.uk>
References: <4BB1B034.9020905@simplistix.co.uk>
Message-ID: <4BB21F18.2010705@vrplumber.com>

Chris Withers wrote:
> Hi All,
>
> Using easy_install to get PyDispatcher results in:
>
...
> Who's the maintainer of PyDispatcher nowadays? Would be handy if they
> removed the sourceforge link from pypi.
...

Thanks for the report.  I've released a 2.0.2 version on PyPI.  That
should now work properly with easy_install.

HTH,
Mike

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com



From bluemangroupie at gmail.com  Tue Mar 30 11:56:26 2010
From: bluemangroupie at gmail.com (aditya)
Date: Tue, 30 Mar 2010 08:56:26 -0700 (PDT)
Subject: Binary Decimals in Python
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
	<24939652-22cb-47f1-97d5-3941463dd7b3@h27g2000yqm.googlegroups.com>
Message-ID: <1c1313db-16ac-4c40-bc89-2950cd9f5592@g10g2000yqh.googlegroups.com>

On Mar 30, 10:49?am, Raymond Hettinger <pyt... at rcn.com> wrote:
> On Mar 30, 8:13?am, aditya <bluemangrou... at gmail.com> wrote:
>
> > To get the decimal representation of a binary number, I can just do
> > this:
>
> > int('11',2) # returns 3
>
> > But decimal binary numbers throw a ValueError:
>
> > int('1.1',2) # should return 1.5, throws error instead.
>
> > Is this by design? It seems to me that this is not the correct
> > behavior.
>
> The int() constructor returns integers.
> So, look to float() for non-integral values.
> Binary representation isn't supported yet,
> but we do have hex:
>
> ? ? >>> float.fromhex('1.8')
> ? ? 1.5
>
> Raymond

That looks very elegant, thanks!


From clp2 at rebertia.com  Tue Mar 30 12:01:54 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 30 Mar 2010 09:01:54 -0700
Subject: (a==b) ? 'Yes' : 'No'
In-Reply-To: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
Message-ID: <50697b2c1003300901k157d10b0u7308b96a1f8be984@mail.gmail.com>

On Tue, Mar 30, 2010 at 8:40 AM, gentlestone <tibor.beck at hotmail.com> wrote:
> Hi, how can I write the popular C/JAVA syntax in Python?
>
> Java example:
> ? ?return (a==b) ? 'Yes' : 'No'
>
> My first idea is:
> ? ?return ('No','Yes')[bool(a==b)]
>
> Is there a more elegant/common python expression for this?

Yes, Python has ternary operator-like syntax:
return ('Yes' if a==b else 'No')

Note that this requires a recent version of Python.

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


From fetchinson at googlemail.com  Tue Mar 30 12:17:04 2010
From: fetchinson at googlemail.com (Daniel Fetchinson)
Date: Tue, 30 Mar 2010 18:17:04 +0200
Subject: (a==b) ? 'Yes' : 'No'
In-Reply-To: <034130b2-295b-4564-ac32-44de15d3f1c1@33g2000yqj.googlegroups.com>
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<034130b2-295b-4564-ac32-44de15d3f1c1@33g2000yqj.googlegroups.com>
Message-ID: <fbe2e2101003300917md4336d2k9c3a1b15c55edeb3@mail.gmail.com>

>> Hi, how can I write the popular C/JAVA syntax in Python?
>>
>> Java example:
>>     return (a==b) ? 'Yes' : 'No'
>>
>> My first idea is:
>>     return ('No','Yes')[bool(a==b)]
>>
>> Is there a more elegant/common python expression for this?
>
> return ('Yes' if a == b else 'No')

And for less clutter you can even leave the parenthesis:

return 'Yes' if a == b else 'No'


-- 
Psss, psss, put it down! - http://www.cafepress.com/putitdown


From fordhaivat at gmail.com  Tue Mar 30 12:23:28 2010
From: fordhaivat at gmail.com (Someone Something)
Date: Tue, 30 Mar 2010 12:23:28 -0400
Subject: CPAN for python?
Message-ID: <e196a4051003300923q44fe1b81o43b43f6b3a3e120c@mail.gmail.com>

Hi,
I've learned python a few months ago but I still use Perl because of CPAN
and the tremendous amount of stuff that's already been done for you. is
there something like CPAN for python?
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From andrej.mitrovich at gmail.com  Tue Mar 30 12:34:18 2010
From: andrej.mitrovich at gmail.com (Andrej Mitrovic)
Date: Tue, 30 Mar 2010 09:34:18 -0700 (PDT)
Subject: Python Script Creator/Generator (function factory)
Message-ID: <d7d4a0e9-f55e-4678-bf59-b7bdd4063d18@z3g2000yqz.googlegroups.com>

Hello,

I have the following situation: I've got a 3rd party application that
has a Python API. The applicaiton has integrated support for MIDI
Hardware Controllers, which can be used to manipulate various
parameters of the application. The app can also load Python User
Scripts, which can define the mapping between the Controllers and
Parameters, but they can also be used to define the behavior of those
mappings as well.

I want to provide my users a GUI App that allows them to map their
MIDI Controllers to the application's Parameters, but with a specific
behavior. Once they've defined the mappings and behavior, my
application would generate a custom Python User Script, which then
gets loaded by the 3rd party app.

I've already got MIDI covered, and the GUI. Deployment via Pyinstaller
has been taken care of as well. My application can currently map
Controllers to Parameters in a 1:1 fashion, and can generate a simple
python User Script with all the mappings. What I'm left with
implementing is the behavior part.

Let me give you a simple example of a possible behavior that the user
could select:

- The user has a button on their MIDI Hardware (a simple type of MIDI
controller)
- The first time the button is hit, a specific parameter is selected
in the 3rd party application.
- The second time the button is hit, a different parameter is
selected.
- And so on, depending on the behavior of the function that's mapped
to that MIDI button

So, in essence, a simple User Script would look something like this
(pseudocode-ish):

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
swap_parameters()
    if button1 was_hit_the_first_time:
        select parameter1
    else:
        select parameter2

buttons = (
button1 = swap_parameters()
button3 = parameter3
button4 = parameter4
...
)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

What I had in mind, was to have a collection of behaviors stored in a
file (basically functions such as "swap_parameters") which the user
could select via my application, map them to a specific MIDI
Controller (such as a Button), and generate the User Script.

In essence, I'm trying to build a function factory that's specific to
the 3rd party application's provided API. But the user would have the
ability to change the way the function works. In the above example,
the user might want their MIDI Button to select parameter2 first, and
parameter1 the second time.

Has anyone had any experience with generating functionality this way,
and could you give me some pointers in the right direction? Any tips,
advice, book recommendations are more than welcome.


Kind regards,
Andrej Mitrovic


From andrej.mitrovich at gmail.com  Tue Mar 30 12:35:42 2010
From: andrej.mitrovich at gmail.com (Andrej Mitrovic)
Date: Tue, 30 Mar 2010 09:35:42 -0700 (PDT)
Subject: Python Script Creator/Generator (function factory)
References: <d7d4a0e9-f55e-4678-bf59-b7bdd4063d18@z3g2000yqz.googlegroups.com>
Message-ID: <e3e83b64-2e8b-4c01-9db2-7ecd3bd8fe8f@y17g2000yqd.googlegroups.com>

I forgot to mention, I'm using Python 2.5.x. I can't use Python 3
unfortunately, the 3rd party application uses Py2.5.x internally, so I
have to limit the functionality to that version.


From kushal.kumaran+python at gmail.com  Tue Mar 30 12:51:40 2010
From: kushal.kumaran+python at gmail.com (Kushal Kumaran)
Date: Tue, 30 Mar 2010 22:21:40 +0530
Subject: CPAN for python?
In-Reply-To: <e196a4051003300923q44fe1b81o43b43f6b3a3e120c@mail.gmail.com>
References: <e196a4051003300923q44fe1b81o43b43f6b3a3e120c@mail.gmail.com>
Message-ID: <1e364c4e1003300951w58515844n222e79df61b60779@mail.gmail.com>

On Tue, Mar 30, 2010 at 9:53 PM, Someone Something <fordhaivat at gmail.com> wrote:
> Hi,
> I've learned python a few months ago but I still use Perl because of CPAN
> and the tremendous amount of stuff that's already been done for you. is
> there something like CPAN for python?
>

Try PyPI. http://pypi.python.org/pypi

-- 
regards,
kushal


From gatoygata2 at gmail.com  Tue Mar 30 12:57:34 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Tue, 30 Mar 2010 09:57:34 -0700 (PDT)
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
Message-ID: <7316f3d2-bcc9-4a1a-8598-cdd5d41fd74b@k17g2000yqb.googlegroups.com>

On Mar 30, 5:40?pm, gentlestone <tibor.b... at hotmail.com> wrote:
> Hi, how can I write the popular C/JAVA syntax in Python?
>
> Java example:
> ? ? return (a==b) ? 'Yes' : 'No'
>
> My first idea is:
> ? ? return ('No','Yes')[bool(a==b)]
>
> Is there a more elegant/common python expression for this?

(a==b) and 'YES' or 'NO'

Yes, ugly

Joaquin


From robert.kern at gmail.com  Tue Mar 30 12:58:39 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 30 Mar 2010 11:58:39 -0500
Subject: (a==b) ? 'Yes' : 'No'
In-Reply-To: <4bb22b39$0$1638$742ec2ed@news.sonic.net>
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
Message-ID: <hotajv$6u1$1@dough.gmane.org>

On 2010-03-30 12:08 PM, John Nagle wrote:
> Chris Rebert wrote:
>> On Tue, Mar 30, 2010 at 8:40 AM, gentlestone <tibor.beck at hotmail.com>
>> wrote:
>>> Hi, how can I write the popular C/JAVA syntax in Python?
>>>
>>> Java example:
>>> return (a==b) ? 'Yes' : 'No'
>>>
>>> My first idea is:
>>> return ('No','Yes')[bool(a==b)]
>>>
>>> Is there a more elegant/common python expression for this?
>>
>> Yes, Python has ternary operator-like syntax:
>> return ('Yes' if a==b else 'No')
>>
>> Note that this requires a recent version of Python.
>
> Who let the dogs in? That's awful syntax.

http://www.python.org/dev/peps/pep-0308/

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From anand.shashwat at gmail.com  Tue Mar 30 13:03:51 2010
From: anand.shashwat at gmail.com (Shashwat Anand)
Date: Tue, 30 Mar 2010 22:33:51 +0530
Subject: CPAN for python?
In-Reply-To: <1e364c4e1003300951w58515844n222e79df61b60779@mail.gmail.com>
References: <e196a4051003300923q44fe1b81o43b43f6b3a3e120c@mail.gmail.com> 
	<1e364c4e1003300951w58515844n222e79df61b60779@mail.gmail.com>
Message-ID: <d4ab53de1003301003y2716fd53t95fe024bd8035ff1@mail.gmail.com>

This has been discussed tons of times. You should have atleast googled it.
Python have nothing like CPAN and Cheese Shop (pypi) comes closest to it.

On Tue, Mar 30, 2010 at 10:21 PM, Kushal Kumaran <
kushal.kumaran+python at gmail.com <kushal.kumaran%2Bpython at gmail.com>> wrote:

> On Tue, Mar 30, 2010 at 9:53 PM, Someone Something <fordhaivat at gmail.com>
> wrote:
> > Hi,
> > I've learned python a few months ago but I still use Perl because of CPAN
> > and the tremendous amount of stuff that's already been done for you. is
> > there something like CPAN for python?
> >
>
> Try PyPI. http://pypi.python.org/pypi
>
> --
> regards,
> kushal
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From steve at REMOVE-THIS-cybersource.com.au  Tue Mar 30 13:05:14 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 30 Mar 2010 17:05:14 GMT
Subject: Binary Decimals in Python
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
	<4e7acb50-797f-4e19-a915-90724cf157fc@u22g2000yqf.googlegroups.com>
Message-ID: <4bb22f4a$0$8827$c3e8da3@news.astraweb.com>

On Tue, 30 Mar 2010 08:28:50 -0700, Patrick Maupin wrote:

> On Mar 30, 10:13?am, aditya <bluemangrou... at gmail.com> wrote:
>> To get the decimal representation of a binary number, I can just do
>> this:
>>
>> int('11',2) # returns 3
>>
>> But decimal binary numbers throw a ValueError:
>>
>> int('1.1',2) # should return 1.5, throws error instead.
>>
>> Is this by design? It seems to me that this is not the correct
>> behavior.
>>
>> - Aditya
> 
> So, why should int('1.1', 2) throw an error when int('1.1') doesn't?


>>> int('1.1')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: invalid literal for int() with base 10: '1.1'


int('1.1', 2) shouldn't return 1.5 because 1.5 isn't an integer.


The obvious question is, why doesn't float('1.1', 2) work? The answer is 
that Python doesn't support floats in any base except 10. It's not 
something needed very often, and it's harder to get right than it might 
seem.



-- 
Steven


From philip at semanchuk.com  Tue Mar 30 13:07:28 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 30 Mar 2010 13:07:28 -0400
Subject: CPAN for python?
In-Reply-To: <e196a4051003300923q44fe1b81o43b43f6b3a3e120c@mail.gmail.com>
References: <e196a4051003300923q44fe1b81o43b43f6b3a3e120c@mail.gmail.com>
Message-ID: <37A3074F-2980-4241-AC59-19E3252D9C6A@semanchuk.com>


On Mar 30, 2010, at 12:23 PM, Someone Something wrote:

> Hi,
> I've learned python a few months ago but I still use Perl because of  
> CPAN and the tremendous amount of stuff that's already been done for  
> you. is there something like CPAN for python?

Yes and no, depending on what CPAN means to you. This question come up  
often; have a look in the archives. Here's one thread on the topic  
from last month:

http://groups.google.com/group/comp.lang.python/browse_thread/thread/ecd51ced8d24593e/f773e080024862cb?lnk=gst&q=cpan#f773e080024862cb



From nagle at animats.com  Tue Mar 30 13:08:31 2010
From: nagle at animats.com (John Nagle)
Date: Tue, 30 Mar 2010 10:08:31 -0700
Subject: (a==b) ? 'Yes' : 'No'
In-Reply-To: <mailman.1317.1269964918.23598.python-list@python.org>
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
Message-ID: <4bb22b39$0$1638$742ec2ed@news.sonic.net>

Chris Rebert wrote:
> On Tue, Mar 30, 2010 at 8:40 AM, gentlestone <tibor.beck at hotmail.com> wrote:
>> Hi, how can I write the popular C/JAVA syntax in Python?
>>
>> Java example:
>>    return (a==b) ? 'Yes' : 'No'
>>
>> My first idea is:
>>    return ('No','Yes')[bool(a==b)]
>>
>> Is there a more elegant/common python expression for this?
> 
> Yes, Python has ternary operator-like syntax:
> return ('Yes' if a==b else 'No')
> 
> Note that this requires a recent version of Python.

     Who let the dogs in?  That's awful syntax.

					John Nagle


From steve at REMOVE-THIS-cybersource.com.au  Tue Mar 30 13:09:18 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 30 Mar 2010 17:09:18 GMT
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
Message-ID: <4bb2303e$0$8827$c3e8da3@news.astraweb.com>

On Tue, 30 Mar 2010 08:40:56 -0700, gentlestone wrote:

> Hi, how can I write the popular C/JAVA syntax in Python?
> 
> Java example:
>     return (a==b) ? 'Yes' : 'No'
> 
> My first idea is:
>     return ('No','Yes')[bool(a==b)]

You don't need the call to bool.

('No','Yes')[a==b]

 
> Is there a more elegant/common python expression for this?

The above is pretty elegant to my eyes, but you can also do:

return 'Yes' if a==b else 'No'



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Tue Mar 30 13:11:29 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 30 Mar 2010 17:11:29 GMT
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
Message-ID: <4bb230c1$0$8827$c3e8da3@news.astraweb.com>

On Tue, 30 Mar 2010 10:08:31 -0700, John Nagle wrote:

>> Yes, Python has ternary operator-like syntax: return ('Yes' if a==b
>> else 'No')
>> 
>> Note that this requires a recent version of Python.
> 
>      Who let the dogs in?  That's awful syntax.

I used to think so to, but now I like it. It matches common English 
syntax like:

"I'm going to the movies tonight, if I leave the office early, otherwise 
I'll stay home and nitpick on Usenet."



-- 
Steven


From sccolbert at gmail.com  Tue Mar 30 13:12:04 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Tue, 30 Mar 2010 13:12:04 -0400
Subject: (a==b) ? 'Yes' : 'No'
In-Reply-To: <4bb22b39$0$1638$742ec2ed@news.sonic.net>
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
Message-ID: <7f014ea61003301012u2b52cf7bi75298750989c46a7@mail.gmail.com>

On Tue, Mar 30, 2010 at 1:08 PM, John Nagle <nagle at animats.com> wrote:

> Chris Rebert wrote:
>
>> On Tue, Mar 30, 2010 at 8:40 AM, gentlestone <tibor.beck at hotmail.com>
>> wrote:
>>
>>> Hi, how can I write the popular C/JAVA syntax in Python?
>>>
>>> Java example:
>>>   return (a==b) ? 'Yes' : 'No'
>>>
>>> My first idea is:
>>>   return ('No','Yes')[bool(a==b)]
>>>
>>> Is there a more elegant/common python expression for this?
>>>
>>
>> Yes, Python has ternary operator-like syntax:
>> return ('Yes' if a==b else 'No')
>>
>> Note that this requires a recent version of Python.
>>
>
>    Who let the dogs in?  That's awful syntax.
>
>                                        John Nagle
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>


I wouldn't say that. It reads exactly how one would say it. I prefer this
over the ? semantics. Whenever I see that, my mind goes "Does a equal b? If
so, return this, otherwise return that". "Return this if a equals b,
otherwise return that" is much more direct and declaritive IMHO.
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From howe.steven at gmail.com  Tue Mar 30 13:19:26 2010
From: howe.steven at gmail.com (Steven Howe)
Date: Tue, 30 Mar 2010 10:19:26 -0700
Subject: CPAN for python?
In-Reply-To: <e196a4051003300923q44fe1b81o43b43f6b3a3e120c@mail.gmail.com>
References: <e196a4051003300923q44fe1b81o43b43f6b3a3e120c@mail.gmail.com>
Message-ID: <4BB2329E.9050304@gmail.com>

This question comes up at least once a month, eliciting a thread that 
goes on for day.
Wouldn't it be wise to put a link on the bottom of the mail list? 
Something like

CPAN for Python == PyPi << make that an href

or

Python( CPAN ) = PyPi

Not too many characters.

sph


On 03/30/2010 09:23 AM, Someone Something wrote:
> Hi,
> I've learned python a few months ago but I still use Perl because of 
> CPAN and the tremendous amount of stuff that's already been done for 
> you. is there something like CPAN for python?

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From gatoygata2 at gmail.com  Tue Mar 30 13:50:15 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Tue, 30 Mar 2010 10:50:15 -0700 (PDT)
Subject: How many packages there are in PyPI
Message-ID: <084b6a4e-27e6-45e0-bebf-256b41598f20@z3g2000yqz.googlegroups.com>

Hi,
PyPI is reaching the 10000 package figure (In the case of 3.x only
about 140 packages and increasing very very slowly).

Looking at available packages for 3.x I observed that some packages
are listed several times. For example, lxml is listed 5 times.
Are these repetitions included in the package count? If yes, just out
of curiosity, somebody knows what the actual number of different
packages in the PyPI reservoir is?

Joaquin.


From steve at holdenweb.com  Tue Mar 30 13:56:04 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 30 Mar 2010 13:56:04 -0400
Subject: (a==b) ? 'Yes' : 'No'
In-Reply-To: <4bb22b39$0$1638$742ec2ed@news.sonic.net>
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
Message-ID: <hotdvr$kl3$1@dough.gmane.org>

John Nagle wrote:
> Chris Rebert wrote:
>> On Tue, Mar 30, 2010 at 8:40 AM, gentlestone <tibor.beck at hotmail.com>
>> wrote:
>>> Hi, how can I write the popular C/JAVA syntax in Python?
>>>
>>> Java example:
>>>    return (a==b) ? 'Yes' : 'No'
>>>
>>> My first idea is:
>>>    return ('No','Yes')[bool(a==b)]
>>>
>>> Is there a more elegant/common python expression for this?
>>
>> Yes, Python has ternary operator-like syntax:
>> return ('Yes' if a==b else 'No')
>>
>> Note that this requires a recent version of Python.
> 
>     Who let the dogs in?  That's awful syntax.
> 
Yes, that's deliberately awful syntax. Guido designed it that way to
ensure that people didn't aver-use it, thereby reducing the readability
of Python applications. Speaking purely personally I hardly ever use it,
but don't dislike it.


regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From mensanator at aol.com  Tue Mar 30 14:03:27 2010
From: mensanator at aol.com (Mensanator)
Date: Tue, 30 Mar 2010 11:03:27 -0700 (PDT)
Subject: Binary Decimals in Python
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
	<24939652-22cb-47f1-97d5-3941463dd7b3@h27g2000yqm.googlegroups.com>
Message-ID: <4eea3f36-10da-498a-890b-d879aac1fb86@y14g2000yqm.googlegroups.com>

On Mar 30, 10:49?am, Raymond Hettinger <pyt... at rcn.com> wrote:
> On Mar 30, 8:13?am, aditya <bluemangrou... at gmail.com> wrote:
>
> > To get the decimal representation of a binary number, I can just do
> > this:
>
> > int('11',2) # returns 3
>
> > But decimal binary numbers throw a ValueError:
>
> > int('1.1',2) # should return 1.5, throws error instead.
>
> > Is this by design? It seems to me that this is not the correct
> > behavior.
>
> The int() constructor returns integers.
> So, look to float() for non-integral values.
> Binary representation isn't supported yet,

It is supported in the gmpy module.

>>> import gmpy
>>> help(gmpy.mpf)
Help on built-in function mpf in module gmpy:

mpf(...)
    mpf(n): builds an mpf object with a numeric value n (n may be any
            Python number, or an mpz, mpq, or mpf object) and a
default
            precision (in bits) depending on the nature of n
    mpf(n,bits=0): as above, but with the specified number of bits (0
            means to use default precision, as above)
    mpf(s,bits=0,base=10): builds an mpf object from a string s made
up of
            digits in the given base, possibly with fraction-part
(with
            period as a separator) and/or exponent-part (with exponent
            marker 'e' for base<=10, else '@'). If base=256, s must be
            a gmpy.mpf portable binary representation as built by the
            function gmpy.fbinary (and the .binary method of mpf
objects).
            The resulting mpf object is built with a default precision
(in
            bits) if bits is 0 or absent, else with the specified
number
            of bits.

>>> gmpy.mpf('1.1',0,2)
mpf('1.5e0')


> but we do have hex:
>
> ? ? >>> float.fromhex('1.8')
> ? ? 1.5
>
> Raymond



From robert.kern at gmail.com  Tue Mar 30 14:05:13 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 30 Mar 2010 13:05:13 -0500
Subject: (a==b) ? 'Yes' : 'No'
In-Reply-To: <4bb230c1$0$8827$c3e8da3@news.astraweb.com>
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>	<mailman.1317.1269964918.23598.python-list@python.org>	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
	<4bb230c1$0$8827$c3e8da3@news.astraweb.com>
Message-ID: <hotegp$mit$1@dough.gmane.org>

On 2010-03-30 12:11 PM, Steven D'Aprano wrote:
> On Tue, 30 Mar 2010 10:08:31 -0700, John Nagle wrote:
>
>>> Yes, Python has ternary operator-like syntax: return ('Yes' if a==b
>>> else 'No')
>>>
>>> Note that this requires a recent version of Python.
>>
>>       Who let the dogs in?  That's awful syntax.
>
> I used to think so to, but now I like it. It matches common English
> syntax like:
>
> "I'm going to the movies tonight, if I leave the office early, otherwise
> I'll stay home and nitpick on Usenet."

I would suggest that this is much more common and less awkward English usage: 
"If I leave the office early, I'm going to the movies tonight; otherwise, I'll 
stay home and nitpick on Usenet."

I don't have a problem with the current syntax, and while its English analogue 
is grammatical, I don't think you can rightly call it idiomatic.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From invalid at invalid.invalid  Tue Mar 30 14:08:14 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Tue, 30 Mar 2010 18:08:14 +0000 (UTC)
Subject: Binary Decimals in Python
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
	<24939652-22cb-47f1-97d5-3941463dd7b3@h27g2000yqm.googlegroups.com>
	<1c1313db-16ac-4c40-bc89-2950cd9f5592@g10g2000yqh.googlegroups.com>
	<4bb23a99$0$1582$742ec2ed@news.sonic.net>
Message-ID: <hoteme$qao$1@reader1.panix.com>

On 2010-03-30, John Nagle <nagle at animats.com> wrote:

> Hex floats are useful because you can get a string representation of
> the exact value of a binary floating point number.  It should always
> be the case that
>
> 	 float.fromhex(float.hex(x)) == x

Until you try running your program on a machine that represents floats
using a radix other than 2,4, or 16.

;)

And it works for NaN and Inf too!

It would have been nice to have had that 5-6 years ago when I had to
write my own pickle/unpickle methods for floating point values so that
inf and nan were portable between Windows and Linux.

-- 
Grant Edwards               grant.b.edwards        Yow! But they went to MARS
                                  at               around 1953!!
                              gmail.com            


From nagle at animats.com  Tue Mar 30 14:14:07 2010
From: nagle at animats.com (John Nagle)
Date: Tue, 30 Mar 2010 11:14:07 -0700
Subject: Binary Decimals in Python
In-Reply-To: <1c1313db-16ac-4c40-bc89-2950cd9f5592@g10g2000yqh.googlegroups.com>
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
	<24939652-22cb-47f1-97d5-3941463dd7b3@h27g2000yqm.googlegroups.com>
	<1c1313db-16ac-4c40-bc89-2950cd9f5592@g10g2000yqh.googlegroups.com>
Message-ID: <4bb23a99$0$1582$742ec2ed@news.sonic.net>

aditya wrote:
> On Mar 30, 10:49 am, Raymond Hettinger <pyt... at rcn.com> wrote:
>> On Mar 30, 8:13 am, aditya <bluemangrou... at gmail.com> wrote:
>>
>>> To get the decimal representation of a binary number, I can just do
>>> this:
>>> int('11',2) # returns 3
>>> But decimal binary numbers throw a ValueError:
>>> int('1.1',2) # should return 1.5, throws error instead.
>>> Is this by design? It seems to me that this is not the correct
>>> behavior.
>> The int() constructor returns integers.
>> So, look to float() for non-integral values.
>> Binary representation isn't supported yet,
>> but we do have hex:
>>
>>     >>> float.fromhex('1.8')
>>     1.5
>>
>> Raymond
> 
> That looks very elegant, thanks!

    Hex floats are useful because you can get a string representation
of the exact value of a binary floating point number.  It should
always be the case that

	 float.fromhex(float.hex(x)) == x

That's not always true of decimal representations, due to rounding problems.

Long discussion of this here: "http://bugs.python.org/issue1580"


				John Nagle

	
	


From no.spam at local.local  Tue Mar 30 14:16:09 2010
From: no.spam at local.local (Robert Fendt)
Date: Tue, 30 Mar 2010 20:16:09 +0200
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
	<mailman.1326.1269971785.23598.python-list@python.org>
Message-ID: <20100330201609.6ef12ee1@vulcan.local>

And thus spake Steve Holden <steve at holdenweb.com>
Tue, 30 Mar 2010 13:56:04 -0400:

> >> Yes, Python has ternary operator-like syntax:
> >> return ('Yes' if a==b else 'No')
> >>
> >> Note that this requires a recent version of Python.
> > 
> >     Who let the dogs in?  That's awful syntax.
>
> Yes, that's deliberately awful syntax. Guido designed it that way to
> ensure that people didn't aver-use it, thereby reducing the readability
> of Python applications. Speaking purely personally I hardly ever use it,
> but don't dislike it.

In fact, the syntax just shouts 'do [...] unless' to me. And
that's so strong a Perl-ism I cannot quite express how ugly I
actually find it...

Regards,
Robert



From nagle at animats.com  Tue Mar 30 14:24:05 2010
From: nagle at animats.com (John Nagle)
Date: Tue, 30 Mar 2010 11:24:05 -0700
Subject: How many packages there are in PyPI
In-Reply-To: <084b6a4e-27e6-45e0-bebf-256b41598f20@z3g2000yqz.googlegroups.com>
References: <084b6a4e-27e6-45e0-bebf-256b41598f20@z3g2000yqz.googlegroups.com>
Message-ID: <4BB241C5.60501@animats.com>

Joaquin Abian wrote:
> Hi,
> PyPI is reaching the 10000 package figure (In the case of 3.x only
> about 140 packages and increasing very very slowly).
> 
> Looking at available packages for 3.x I observed that some packages
> are listed several times. For example, lxml is listed 5 times.
> Are these repetitions included in the package count? If yes, just out
> of curiosity, somebody knows what the actual number of different
> packages in the PyPI reservoir is?
> 
> Joaquin.

    There aren't that many packages "in" PyPI. It's more of a directory than
a repository.  And some of the links are dead.

    I just tried "Dejavu", which only has a link to "projects.amor.org". That
subdomain is dead.  "amor.org" is some kind of religious organization.

					John Nagle


From python at mrabarnett.plus.com  Tue Mar 30 14:52:36 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 30 Mar 2010 19:52:36 +0100
Subject: Binary Decimals in Python
In-Reply-To: <4bb23a99$0$1582$742ec2ed@news.sonic.net>
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>	<24939652-22cb-47f1-97d5-3941463dd7b3@h27g2000yqm.googlegroups.com>	<1c1313db-16ac-4c40-bc89-2950cd9f5592@g10g2000yqh.googlegroups.com>
	<4bb23a99$0$1582$742ec2ed@news.sonic.net>
Message-ID: <4BB24874.6020309@mrabarnett.plus.com>

John Nagle wrote:
> aditya wrote:
>> On Mar 30, 10:49 am, Raymond Hettinger <pyt... at rcn.com> wrote:
>>> On Mar 30, 8:13 am, aditya <bluemangrou... at gmail.com> wrote:
>>>
>>>> To get the decimal representation of a binary number, I can just do
>>>> this:
>>>> int('11',2) # returns 3
>>>> But decimal binary numbers throw a ValueError:
>>>> int('1.1',2) # should return 1.5, throws error instead.
>>>> Is this by design? It seems to me that this is not the correct
>>>> behavior.
>>> The int() constructor returns integers.
>>> So, look to float() for non-integral values.
>>> Binary representation isn't supported yet,
>>> but we do have hex:
>>>
>>>     >>> float.fromhex('1.8')
>>>     1.5
>>>
>>> Raymond
>>
>> That looks very elegant, thanks!
> 
>    Hex floats are useful because you can get a string representation
> of the exact value of a binary floating point number.  It should
> always be the case that
> 
>      float.fromhex(float.hex(x)) == x
> 
> That's not always true of decimal representations, due to rounding 
> problems.
> 
Floats have a limited length, unlike ints which are virtually unlimited.

> Long discussion of this here: "http://bugs.python.org/issue1580"
> 


From john at castleamber.com  Tue Mar 30 15:19:19 2010
From: john at castleamber.com (John Bokma)
Date: Tue, 30 Mar 2010 13:19:19 -0600
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
	<mailman.1326.1269971785.23598.python-list@python.org>
	<20100330201609.6ef12ee1@vulcan.local>
Message-ID: <87sk7h8vns.fsf@castleamber.com>

Robert Fendt <no.spam at local.local> writes:

> In fact, the syntax just shouts 'do [...] unless' to me. And
> that's so strong a Perl-ism I cannot quite express how ugly I
> actually find it...

And

 a == b and 'Yes' or 'No' 

isn't a Perl-ism?

Sheesh, this group would be so much nicer without the constant dragging
in of Perl to make a point. On top of that, do {  } unless blocks are
not idomatic in Perl. Perl Best Practices even clearly states to *never*
use unless.

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From quentel.pierre at wanadoo.fr  Tue Mar 30 15:38:08 2010
From: quentel.pierre at wanadoo.fr (Pierre Quentel)
Date: Tue, 30 Mar 2010 12:38:08 -0700 (PDT)
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net> 
	<mailman.1326.1269971785.23598.python-list@python.org>
	<20100330201609.6ef12ee1@vulcan.local> 
	<87sk7h8vns.fsf@castleamber.com>
Message-ID: <5ef544bb-95a0-4329-80ef-f679d62b8ead@z11g2000yqz.googlegroups.com>

On 30 mar, 21:19, John Bokma <j... at castleamber.com> wrote:
> Robert Fendt <no.s... at local.local> writes:
> > In fact, the syntax just shouts 'do [...] unless' to me. And
> > that's so strong a Perl-ism I cannot quite express how ugly I
> > actually find it...
>
> And
>
> ?a == b and 'Yes' or 'No'
>
> isn't a Perl-ism?
>
> Sheesh, this group would be so much nicer without the constant dragging
> in of Perl to make a point. On top of that, do { ?} unless blocks are
> not idomatic in Perl. Perl Best Practices even clearly states to *never*
> use unless.
>
> --
> John Bokma ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? j3b
>
> Hacking & Hiking in Mexico - ?http://johnbokma.com/http://castleamber.com/- Perl & Python Development

I'm surprised nobody proposed a solution with itertools ;-)

- Pierre


From russ.paielli at gmail.com  Tue Mar 30 16:03:37 2010
From: russ.paielli at gmail.com (Russ P.)
Date: Tue, 30 Mar 2010 13:03:37 -0700 (PDT)
Subject: "Usability, the Soul of Python"
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
	<4bb14173$0$1640$742ec2ed@news.sonic.net>
	<mailman.1300.1269939807.23598.python-list@python.org> 
	<hosnrh$6na$1@news.eternal-september.org>
Message-ID: <ef70b39d-a538-45d4-85bd-c8a424dc3f83@e7g2000yqf.googlegroups.com>

According to Wikipedia, this is called the Whitesmith style:

for(i = 99; i > 0; ++i)
     {
     printf("%d slabs of spam in my mail!\n", i);
     printf("%d slabs of spam,\n", i);
     printf("Send one to abuse and Just Hit Delete,\n");
     printf("%d slabs of spam in my mail!\n\n", i + 1);
     }

I agree with the Mr. Hayward that it is preferable to the more common
K&R style, because the braces do not violate and visually clutter the
logical indentation structure. It looks more like Python. The deeper
the level of nesting, the more this style reduces visual clutter
compared to the conventional style.

A slightly better style, in my opinion, is the Banner style:

for(i = 99; i > 0; ++i) {
     // a blank line here is optional
     printf("%d slabs of spam in my mail!\n", i);
     printf("%d slabs of spam,\n", i);
     printf("Send one to abuse and Just Hit Delete,\n");
     printf("%d slabs of spam in my mail!\n\n", i + 1);
     }


On Mar 30, 4:40?am, "Alf P. Steinbach" <al... at start.no> wrote:
> * Jean-Michel Pichavant:
>
> > John Nagle wrote:
> >> Jonathan Hayward wrote:
> >>> I've posted "Usability, the Soul of Python: An Introduction to the
> >>> Python Programming Language Through the Eyes of Usability", at:
>
> >>> ? ?http://JonathansCorner.com/python/
>
> >> ? ?No, it's just a rather verbose introduction to Python, in dark brown
> >> type on a light brown background. ?One could write a good paper on this
> >> topic, but this isn't it.
>
> >> ? ? ? ? ? ? ? ? John Nagle
> > Why is it bad ?
>
> Consider
>
> <quote>
> ?From a usability standpoint, the braces go with the lines to print out the
> stanza rather than the for statement or the code after, so the following is best:
>
> for(i = 99; i > 0; ++i)
> ? ? ?{
> ? ? ?printf("%d slabs of spam in my mail!\n", i);
> ? ? ?printf("%d slabs of spam,\n", i);
> ? ? ?printf("Send one to abuse and Just Hit Delete,\n");
> ? ? ?printf("%d slabs of spam in my mail!\n\n", i + 1);
> ? ? ?}
> </quote>
>
> This is just unsubstantiated opinion, but worse, it makes a tacit assumption
> that there is "best" way to do indentation. However, most programmers fall into
> that trap, and I've done it myself. In fact, when I worked as a consultant (then
> in Andersen Consulting, now Accenture) I used the style above. Petter
> Hesselberg, author of "Industrial Strength Windows Programming" (heh, I'm
> mentioned) asked my why on Earth I did that, like, nobody does that? It was a
> habit I'd picked up in Pascal, from very na?ve considerations of parse nesting
> levels, a kind of misguided idealism instead of more practical pragmatism, but
> since I realized that that was an incredibly weak argument I instead answered by
> pointing towards Charles Petzold's code in his "Programming Windows" books. And
> amazingly I was allowed to continue using this awkward and impractical style.
>
> I may or may not have been responsible for the similarly impractical compromise
> convention of using three spaces per indentation level. At least, in one big
> meeting the question about number of spaces was raised by the speaker, and I
> replied from the benches, just in jest, "three!". And that was it (perhaps).
>
> Cheers,
>
> - Alf ?(admitting to earlier mistakes)



From no.spam at local.local  Tue Mar 30 16:16:00 2010
From: no.spam at local.local (Robert Fendt)
Date: Tue, 30 Mar 2010 22:16:00 +0200
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
	<mailman.1326.1269971785.23598.python-list@python.org>
	<20100330201609.6ef12ee1@vulcan.local>
	<87sk7h8vns.fsf@castleamber.com>
Message-ID: <20100330221600.42cd3536@vulcan.local>

And thus spake John Bokma <john at castleamber.com>
Tue, 30 Mar 2010 13:19:19 -0600:

> And
> 
>  a == b and 'Yes' or 'No' 
> 
> isn't a Perl-ism?

I never said that this would be better. I don't even get the
point of what the advantage is supposed to be of inverting the
order of the return statement and the conditional check what
should actually _be_ returned. What's wrong with just writing

if a==b:
  return 'Yes'
else:
  return 'No'

apart from it being a few more line breaks and an additional
return statement? The inverted form is not more readable per
se (in fact, quite the opposite), and I would even suggest to
minimise its use even in languages like C++ and Java. The Python
syntax is even worse since it not only inverts the order of
return statement and conditional check, but it also puts the
conditional between the two results.

I find such a convoluted construct especially ugly in a language
which I previously regarded as having a rather striking beauty
of syntactical simplicity. The construct is superfluous,
illogical, unelegant, and thus very un-pythonesque, IMHO. But of
course that's just my $0.02.

> Sheesh, this group would be so much nicer without the constant dragging
> in of Perl to make a point. On top of that, do {  } unless blocks are
> not idomatic in Perl. Perl Best Practices even clearly states to *never*
> use unless.

Sorry, but you have just underlined my point, in fact. If it's
discouraged by experts, then of course the question must be
valid why such a feature even exists (okay, apart from 'it
seemed like a good idea at the time'). And more importantly (and
more on-topic here), why we have to have an analogon in Python.

Regards,
Robert



From ckaynor at zindagigames.com  Tue Mar 30 16:19:33 2010
From: ckaynor at zindagigames.com (Chris Kaynor)
Date: Tue, 30 Mar 2010 13:19:33 -0700
Subject: Binary Decimals in Python
In-Reply-To: <4bb23a99$0$1582$742ec2ed@news.sonic.net>
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
	<24939652-22cb-47f1-97d5-3941463dd7b3@h27g2000yqm.googlegroups.com>
	<1c1313db-16ac-4c40-bc89-2950cd9f5592@g10g2000yqh.googlegroups.com>
	<4bb23a99$0$1582$742ec2ed@news.sonic.net>
Message-ID: <a03c8d051003301319u5c14645eh7e403ece9b1a6b3a@mail.gmail.com>

Chris


On Tue, Mar 30, 2010 at 11:14 AM, John Nagle <nagle at animats.com> wrote:

> aditya wrote:
>
>> On Mar 30, 10:49 am, Raymond Hettinger <pyt... at rcn.com> wrote:
>>
>>> On Mar 30, 8:13 am, aditya <bluemangrou... at gmail.com> wrote:
>>>
>>>  To get the decimal representation of a binary number, I can just do
>>>> this:
>>>> int('11',2) # returns 3
>>>> But decimal binary numbers throw a ValueError:
>>>> int('1.1',2) # should return 1.5, throws error instead.
>>>> Is this by design? It seems to me that this is not the correct
>>>> behavior.
>>>>
>>> The int() constructor returns integers.
>>> So, look to float() for non-integral values.
>>> Binary representation isn't supported yet,
>>> but we do have hex:
>>>
>>>    >>> float.fromhex('1.8')
>>>    1.5
>>>
>>> Raymond
>>>
>>
>> That looks very elegant, thanks!
>>
>
>   Hex floats are useful because you can get a string representation
> of the exact value of a binary floating point number.  It should
> always be the case that
>
>         float.fromhex(float.hex(x)) == x
>
> That's not always true of decimal representations, due to rounding
> problems.
>

Actually, any number you can represent exactly in base 2 (or any power there
of) you can also represent exactly in decimal - its the other way around
thats a problem.


>
> Long discussion of this here: "http://bugs.python.org/issue1580"
>
>
>                                John Nagle
>
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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From steve at holdenweb.com  Tue Mar 30 16:32:51 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 30 Mar 2010 16:32:51 -0400
Subject: (a==b) ? 'Yes' : 'No'
In-Reply-To: <20100330221600.42cd3536@vulcan.local>
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>	<mailman.1317.1269964918.23598.python-list@python.org>	<4bb22b39$0$1638$742ec2ed@news.sonic.net>	<mailman.1326.1269971785.23598.python-list@python.org>	<20100330201609.6ef12ee1@vulcan.local>	<87sk7h8vns.fsf@castleamber.com>
	<20100330221600.42cd3536@vulcan.local>
Message-ID: <hotn5l$pql$1@dough.gmane.org>

Robert Fendt wrote:
> And thus spake John Bokma <john at castleamber.com>
> Tue, 30 Mar 2010 13:19:19 -0600:
> 
>> And
>>
>>  a == b and 'Yes' or 'No' 
>>
>> isn't a Perl-ism?
> 
> I never said that this would be better. I don't even get the
> point of what the advantage is supposed to be of inverting the
> order of the return statement and the conditional check what
> should actually _be_ returned. What's wrong with just writing
> 
> if a==b:
>   return 'Yes'
> else:
>   return 'No'
> 
> apart from it being a few more line breaks and an additional
> return statement? The inverted form is not more readable per
> se (in fact, quite the opposite), and I would even suggest to
> minimise its use even in languages like C++ and Java. The Python
> syntax is even worse since it not only inverts the order of
> return statement and conditional check, but it also puts the
> conditional between the two results.
> 
> I find such a convoluted construct especially ugly in a language
> which I previously regarded as having a rather striking beauty
> of syntactical simplicity. The construct is superfluous,
> illogical, unelegant, and thus very un-pythonesque, IMHO. But of
> course that's just my $0.02.
> 
>> Sheesh, this group would be so much nicer without the constant dragging
>> in of Perl to make a point. On top of that, do {  } unless blocks are
>> not idomatic in Perl. Perl Best Practices even clearly states to *never*
>> use unless.
> 
> Sorry, but you have just underlined my point, in fact. If it's
> discouraged by experts, then of course the question must be
> valid why such a feature even exists (okay, apart from 'it
> seemed like a good idea at the time'). And more importantly (and
> more on-topic here), why we have to have an analogon in Python.

It exists because people nagged Guido mercilessly until, against his
better judgment, he capitulated.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From saimapk81 at gmail.com  Tue Mar 30 16:33:15 2010
From: saimapk81 at gmail.com (saima81)
Date: Tue, 30 Mar 2010 13:33:15 -0700 (PDT)
Subject: "jobs in kuwait" "jobs in kuwait for pakistanis" "jobs in kuwait 
	2010" "jobs in kuwait airways" "jobs in kuwait banks" "jobs in kuwait 
	telecom" "kuwait jobs" "kuwait airways" "kuwait jobs online" on   
	http://jobsinkuwait-net.blogspot.com/
Message-ID: <57003757-f992-4c10-82d5-1d91fe247d35@z35g2000yqd.googlegroups.com>

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kuwait for pakistanis" "jobs in kuwait 2010"  "jobs in kuwait airways"
"jobs in kuwait banks" "jobs in kuwait telecom" "kuwait jobs" "kuwait
airways" "kuwait jobs online" on   http://jobsinkuwait-net.blogspot.com/
"jobs in kuwait" "jobs in kuwait for pakistanis" "jobs in kuwait
2010"  "jobs in kuwait airways" "jobs in kuwait banks" "jobs in kuwait
telecom" "kuwait jobs" "kuwait airways" "kuwait jobs online" on
http://jobsinkuwait-net.blogspot.com/        "jobs in kuwait" "jobs in
kuwait for pakistanis" "jobs in kuwait 2010"  "jobs in kuwait airways"
"jobs in kuwait banks" "jobs in kuwait telecom" "kuwait jobs" "kuwait
airways" "kuwait jobs online" on   http://jobsinkuwait-net.blogspot.com/
"jobs in kuwait" "jobs in kuwait for pakistanis" "jobs in kuwait
2010"  "jobs in kuwait airways" "jobs in kuwait banks" "jobs in kuwait
telecom" "kuwait jobs" "kuwait airways" "kuwait jobs online" on
http://jobsinkuwait-net.blogspot.com/        "jobs in kuwait" "jobs in
kuwait for pakistanis" "jobs in kuwait 2010"  "jobs in kuwait airways"
"jobs in kuwait banks" "jobs in kuwait telecom" "kuwait jobs" "kuwait
airways" "kuwait jobs online" on   http://jobsinkuwait-net.blogspot.com/
"jobs in kuwait" "jobs in kuwait for pakistanis" "jobs in kuwait
2010"  "jobs in kuwait airways" "jobs in kuwait banks" "jobs in kuwait
telecom" "kuwait jobs" "kuwait airways" "kuwait jobs online" on
http://jobsinkuwait-net.blogspot.com/        "jobs in kuwait" "jobs in
kuwait for pakistanis" "jobs in kuwait 2010"  "jobs in kuwait airways"
"jobs in kuwait banks" "jobs in kuwait telecom" "kuwait jobs" "kuwait
airways" "kuwait jobs online" on   http://jobsinkuwait-net.blogspot.com/
"jobs in kuwait" "jobs in kuwait for pakistanis" "jobs in kuwait
2010"  "jobs in kuwait airways" "jobs in kuwait banks" "jobs in kuwait
telecom" "kuwait jobs" "kuwait airways" "kuwait jobs online" on
http://jobsinkuwait-net.blogspot.com/        "jobs in kuwait" "jobs in
kuwait for pakistanis" "jobs in kuwait 2010"  "jobs in kuwait airways"
"jobs in kuwait banks" "jobs in kuwait telecom" "kuwait jobs" "kuwait
airways" "kuwait jobs online" on   http://jobsinkuwait-net.blogspot.com/
"jobs in kuwait" "jobs in kuwait for pakistanis" "jobs in kuwait
2010"  "jobs in kuwait airways" "jobs in kuwait banks" "jobs in kuwait
telecom" "kuwait jobs" "kuwait airways" "kuwait jobs online" on
http://jobsinkuwait-net.blogspot.com/        "jobs in kuwait" "jobs in
kuwait for pakistanis" "jobs in kuwait 2010"  "jobs in kuwait airways"
"jobs in kuwait banks" "jobs in kuwait telecom" "kuwait jobs" "kuwait
airways" "kuwait jobs online" on   http://jobsinkuwait-net.blogspot.com/
"jobs in kuwait" "jobs in kuwait for pakistanis" "jobs in kuwait
2010"  "jobs in kuwait airways" "jobs in kuwait banks" "jobs in kuwait
telecom" "kuwait jobs" "kuwait airways" "kuwait jobs online" on
http://jobsinkuwait-net.blogspot.com/        "jobs in kuwait" "jobs in
kuwait for pakistanis" "jobs in kuwait 2010"  "jobs in kuwait airways"
"jobs in kuwait banks" "jobs in kuwait telecom" "kuwait jobs" "kuwait
airways" "kuwait jobs online" on   http://jobsinkuwait-net.blogspot.com/
"jobs in kuwait" "jobs in kuwait for pakistanis" "jobs in kuwait
2010"  "jobs in kuwait airways" "jobs in kuwait banks" "jobs in kuwait
telecom" "kuwait jobs" "kuwait airways" "kuwait jobs online" on
http://jobsinkuwait-net.blogspot.com/        "jobs in kuwait" "jobs in
kuwait for pakistanis" "jobs in kuwait 2010"  "jobs in kuwait airways"
"jobs in kuwait banks" "jobs in kuwait telecom" "kuwait jobs" "kuwait
airways" "kuwait jobs online" on   http://jobsinkuwait-net.blogspot.com/
"jobs in kuwait" "jobs in kuwait for pakistanis" "jobs in kuwait
2010"  "jobs in kuwait airways" "jobs in kuwait banks" "jobs in kuwait
telecom" "kuwait jobs" "kuwait airways" "kuwait jobs online" on
http://jobsinkuwait-net.blogspot.com/        "jobs in kuwait" "jobs in
kuwait for pakistanis" "jobs in kuwait 2010"  "jobs in kuwait airways"
"jobs in kuwait banks" "jobs in kuwait telecom" "kuwait jobs" "kuwait
airways" "kuwait jobs online" on   http://jobsinkuwait-net.blogspot.com/
"jobs in kuwait" "jobs in kuwait for pakistanis" "jobs in kuwait
2010"  "jobs in kuwait airways" "jobs in kuwait banks" "jobs in kuwait
telecom" "kuwait jobs" "kuwait airways" "kuwait jobs online" on
http://jobsinkuwait-net.blogspot.com/        "jobs in kuwait" "jobs in
kuwait for pakistanis" "jobs in kuwait 2010"  "jobs in kuwait airways"
"jobs in kuwait banks" "jobs in kuwait telecom" "kuwait jobs" "kuwait
airways" "kuwait jobs online" on   http://jobsinkuwait-net.blogspot.com/
"jobs in kuwait" "jobs in kuwait for pakistanis" "jobs in kuwait
2010"  "jobs in kuwait airways" "jobs in kuwait banks" "jobs in kuwait
telecom" "kuwait jobs" "kuwait airways" "kuwait jobs online" on
http://jobsinkuwait-net.blogspot.com/        "jobs in kuwait" "jobs in
kuwait for pakistanis" "jobs in kuwait 2010"  "jobs in kuwait airways"
"jobs in kuwait banks" "jobs in kuwait telecom" "kuwait jobs" "kuwait
airways" "kuwait jobs online" on   http://jobsinkuwait-net.blogspot.com/
"jobs in kuwait" "jobs in kuwait for pakistanis" "jobs in kuwait
2010"  "jobs in kuwait airways" "jobs in kuwait banks" "jobs in kuwait
telecom" "kuwait jobs" "kuwait airways" "kuwait jobs online" on
http://jobsinkuwait-net.blogspot.com/        "jobs in kuwait" "jobs in
kuwait for pakistanis" "jobs in kuwait 2010"  "jobs in kuwait airways"
"jobs in kuwait banks" "jobs in kuwait telecom" "kuwait jobs" "kuwait
airways" "kuwait jobs online" on   http://jobsinkuwait-net.blogspot.com/
"jobs in kuwait" "jobs in kuwait for pakistanis" "jobs in kuwait
2010"  "jobs in kuwait airways" "jobs in kuwait banks" "jobs in kuwait
telecom" "kuwait jobs" "kuwait airways" "kuwait jobs online" on
http://jobsinkuwait-net.blogspot.com/        "jobs in kuwait" "jobs in
kuwait for pakistanis" "jobs in kuwait 2010"  "jobs in kuwait airways"
"jobs in kuwait banks" "jobs in kuwait telecom" "kuwait jobs" "kuwait
airways" "kuwait jobs online" on   http://jobsinkuwait-net.blogspot.com/


From lxkain at gmail.com  Tue Mar 30 16:43:42 2010
From: lxkain at gmail.com (LX)
Date: Tue, 30 Mar 2010 13:43:42 -0700 (PDT)
Subject: decorators only when __debug__ == True
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>
	<mailman.1295.1269912866.23598.python-list@python.org>
Message-ID: <7778821c-84f3-4829-8e05-85134c5d6c5b@y17g2000yqd.googlegroups.com>

On Mar 29, 6:34?pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
> LX wrote:
> > Hi all, I have a question about decorators. I would like to use them
> > for argument checking, and pre/post conditions. However, I don't want
> > the additional overhead when I run in non-debug mode. I could do
> > something like this, using a simple trace example.
>
> > @decorator
> > def pass_decorator(f, *args, **kw): # what about the slow-down that
> > incurs when using pass_decorator?
> > ? ? return f(*args, **kw)
>
> > @decorator
> > def trace_decorator(f, *args, **kw):
> > ? ? print "calling %s with args %s, %s" % (f.func_name, args, kw)
> > ? ? return f(*args, **kw)
>
> > trace_enable_flag = False #__debug__
> > trace = trace_decorator if trace_enable_flag else pass_decorator
>
> > Trouble is, there is still an additional encapsulating function call.
> > Is there any way to eliminate the extra function call altogether?
> > Thanks in advance!
>
> I think you have misunderstood certain details about decorators.
>
> This code with a decorator:
>
> ? ? ?@decorator
> ? ? ?def hello():
> ? ? ? ? ?print "hello world"
>
> basically does this:
>
> ? ? ?def hello():
> ? ? ? ? ?print "hello world"
> ? ? ?hello = decorator(hello)
>
> so your non-decorator just needs to return the function it was passed:
>
> ? ? ?def pass_decorator(func):
> ? ? ? ? ?return func
>
> and your trace decorator would be something like this:
>
> ? ? ?def trace_decorator(func):
> ? ? ? ? ?def show(*args, **kwargs):
> ? ? ? ? ? ? ?print "calling %s with args %s, %s" % (func.func_name,
> args, kwargs)
> ? ? ? ? ? ? ?result = func(*args, **kwargs)
> ? ? ? ? ? ? ?print "returning %s from %s" % (result, func.func_name)
> ? ? ? ? ? ? ?return result
> ? ? ? ? ?return show

Sure, but during runtime, pass_decorator will still be called, even
though it doesn't do anything. I am wondering if I can disable this
additional function call at non-debug runtime. In other words, I want
the calling stack to contain no decorator at all, not even
pass_decorator.

I should mention that, in my code, the symbol "decorator" is imported
from Michele Simionato's decorator.py file.


From lxkain at gmail.com  Tue Mar 30 16:44:40 2010
From: lxkain at gmail.com (LX)
Date: Tue, 30 Mar 2010 13:44:40 -0700 (PDT)
Subject: decorators only when __debug__ == True
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>
	<pan.2010.03.30.02.11.09@REMOVE.THIS.cybersource.com.au>
Message-ID: <ac238901-6c37-48c3-8a22-57fe849ee828@e6g2000yqh.googlegroups.com>

On Mar 29, 7:11?pm, Steven D'Aprano
<ste... at REMOVE.THIS.cybersource.com.au> wrote:
> On Mon, 29 Mar 2010 17:54:26 -0700, LX wrote:
> > Hi all, I have a question about decorators. I would like to use them for
> > argument checking, and pre/post conditions. However, I don't want the
> > additional overhead when I run in non-debug mode. I could do something
> > like this, using a simple trace example.
>
> def decorator(func):
> ? ? if __debug__:
> ? ? ? ? @functools.wraps(func)
> ? ? ? ? def inner(*args, **kwargs):
> ? ? ? ? ? ? preprocess()
> ? ? ? ? ? ? result = func(*args, **kwargs)
> ? ? ? ? ? ? postprocess()
> ? ? ? ? ? ? return result
> ? ? ? ? return inner
> ? ? else:
> ? ? ? ? return func
>
> --
> Steven

Actually, I am using "decorator" from Michele Simionato's decorator.py
file, at http://pypi.python.org/pypi/decorator.


From anton.shishkov at gmail.com  Tue Mar 30 16:47:42 2010
From: anton.shishkov at gmail.com (ASh)
Date: Tue, 30 Mar 2010 13:47:42 -0700 (PDT)
Subject: psycopg2 / psycopg2.DataError: invalid input syntax for type 
	timestamp with time zone:
Message-ID: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>

Hi, please help me understand why am I getting error with this query


            new_start_date = "NOW() - '29 days'::INTERVAL"
            self.dyndb.orderdb.query('''update xxxx set creation_date
= %s
            where id_order = %s''', (new_start_date, "123"))



...
psycopg2.DataError: invalid input syntax for type timestamp with time
zone: "NOW() - '29 days'::INTERVAL"




From news1234 at free.fr  Tue Mar 30 17:01:40 2010
From: news1234 at free.fr (News123)
Date: Tue, 30 Mar 2010 23:01:40 +0200
Subject: xpat error in xmlrp client. How to inspect data.
In-Reply-To: <mailman.1297.1269923825.23598.python-list@python.org>
References: <4bab1f4a$0$25677$426a74cc@news.free.fr>
	<mailman.1297.1269923825.23598.python-list@python.org>
Message-ID: <4bb266b5$0$21786$426a74cc@news.free.fr>

Hi Gabriel,

Gabriel Genellina wrote:
> En Thu, 25 Mar 2010 05:31:05 -0300, News123 <news1234 at free.fr> escribi?:
> 
>> I'm havign a small xmlrpc client, which works normally fine.
>> (xmlrpc via https)
>>
>> Sometimes however I receive an Exception about an expat error.
>>
>>
>> The output, that I receive is:
>>   File "C:\mycode\myrpcclient.py", line 63, in upload_chunk
>>     rslt = myrpcclient.call()
>>   File "C:\Python26\lib\xmlrpclib.py", line 1199, in __call__
>>     return self.__send(self.__name, args)
>>   File "C:\Python26\lib\xmlrpclib.py", line 1489, in __request
>>     verbose=self.__verbose
>>   File "C:\Python26\lib\xmlrpclib.py", line 1253, in request
>>     return self._parse_response(h.getfile(), sock)
>>   File "C:\Python26\lib\xmlrpclib.py", line 1387, in _parse_response
>>     p.feed(response)
>>   File "C:\Python26\lib\xmlrpclib.py", line 601, in feed
>>     self._parser.Parse(data, 0)
>> ExpatError: syntax error: line 1, column 0
>>
> 
> a) Use the standard cgitb module (despite its name, it is useful outside
> CGI scripts)
> 
> b) Use the tb module available from http://pypi.python.org/pypi/tb
> 
I'm currently using the default module traceback and code, which looks
roughly like:

try:
  xmlrpccall()
except Exception as e:
  ex_type,ex_value,e_b = sys.exc_info()
  tbstring = traceback.format_exc()
  logging.error('%s:%s:%s' % (ex_type,ex_value,tbstring)


do cgitb or tb really provide much more info?


> Both provide a more verbose traceback, including local variables at each
> execution frame.
> 
> c) Replace ("monkey-patch") the feed() method with a more debug-friendly
> version:
> 
> def feed(self, data):
>   try:
>     self._parser.Parse(data, 0)
>   except xmlrpclib.expat.ExpatError, e:
>     e.args += (data,)
>     raise
> 
> xmlrpclib.ExpatParser.feed = feed

Well, the monkey patch seems to be THE solution for my problem. Thanks a
lot.
Now I'll just have to wait till the problem shows up again.
Probably I'll just display the backtrace in the except section.

> 
> (Or perhaps set e.data = data)
> 
> d) In your exception handler, walk the traceback object until you reach
> the feed() call, and inspect the corresponding tb_frame.f_locals
> dictionary.

How can I walk a traceback? For the current problem the the monkeypatch
should be good enough, but for other cases it might be good to know.



bye

N


From mensanator at aol.com  Tue Mar 30 17:05:44 2010
From: mensanator at aol.com (Mensanator)
Date: Tue, 30 Mar 2010 14:05:44 -0700 (PDT)
Subject: Binary Decimals in Python
References: <f17047d5-ab71-48a1-969f-b5fd48ccc93e@15g2000yqi.googlegroups.com>
	<24939652-22cb-47f1-97d5-3941463dd7b3@h27g2000yqm.googlegroups.com> 
	<1c1313db-16ac-4c40-bc89-2950cd9f5592@g10g2000yqh.googlegroups.com> 
	<4bb23a99$0$1582$742ec2ed@news.sonic.net>
	<mailman.1328.1269975152.23598.python-list@python.org>
Message-ID: <951faaf2-affd-474c-811b-157579b2897c@g10g2000yqh.googlegroups.com>

On Mar 30, 1:52?pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
> John Nagle wrote:
> > aditya wrote:
> >> On Mar 30, 10:49 am, Raymond Hettinger <pyt... at rcn.com> wrote:
> >>> On Mar 30, 8:13 am, aditya <bluemangrou... at gmail.com> wrote:
>
> >>>> To get the decimal representation of a binary number, I can just do
> >>>> this:
> >>>> int('11',2) # returns 3
> >>>> But decimal binary numbers throw a ValueError:
> >>>> int('1.1',2) # should return 1.5, throws error instead.
> >>>> Is this by design? It seems to me that this is not the correct
> >>>> behavior.
> >>> The int() constructor returns integers.
> >>> So, look to float() for non-integral values.
> >>> Binary representation isn't supported yet,
> >>> but we do have hex:
>
> >>> ? ? >>> float.fromhex('1.8')
> >>> ? ? 1.5
>
> >>> Raymond
>
> >> That looks very elegant, thanks!
>
> > ? ?Hex floats are useful because you can get a string representation
> > of the exact value of a binary floating point number. ?It should
> > always be the case that
>
> > ? ? ?float.fromhex(float.hex(x)) == x
>
> > That's not always true of decimal representations, due to rounding
> > problems.
>
> Floats have a limited length, unlike ints which are virtually unlimited.

gmpy gives you arbitrary precision floats, also.

>
>
>
> > Long discussion of this here: "http://bugs.python.org/issue1580"- Hide quoted text -
>
> - Show quoted text -- Hide quoted text -
>
> - Show quoted text -



From philip at semanchuk.com  Tue Mar 30 17:26:51 2010
From: philip at semanchuk.com (Philip Semanchuk)
Date: Tue, 30 Mar 2010 17:26:51 -0400
Subject: psycopg2 / psycopg2.DataError: invalid input syntax for type
	timestamp with time zone:
In-Reply-To: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>
References: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>
Message-ID: <5171EFC3-09A0-4937-BDAD-C179CF1E1DFE@semanchuk.com>


On Mar 30, 2010, at 4:47 PM, ASh wrote:

> Hi, please help me understand why am I getting error with this query
>
>
>            new_start_date = "NOW() - '29 days'::INTERVAL"
>            self.dyndb.orderdb.query('''update xxxx set creation_date
> = %s
>            where id_order = %s''', (new_start_date, "123"))
>
>
>
> ...
> psycopg2.DataError: invalid input syntax for type timestamp with time
> zone: "NOW() - '29 days'::INTERVAL"

Hi Anton,
It sounds to me like the problem is with your SQL rather than with  
psycopg2 or Python. Try the query directly in Postgres -- does it work  
there? If so, then your next step should be to ask on the psycopg2  
mailing list that Google can find for you.

Good luck
Philip



From hp6 at rice.edu  Tue Mar 30 17:31:58 2010
From: hp6 at rice.edu (Justin Park)
Date: Tue, 30 Mar 2010 16:31:58 -0500
Subject: A question about making a sort-of-counter. 
Message-ID: <4BB26DCE.7070307@rice.edu>

Suppose I have a list.
a = list()
And suppose allowed digits as the element are 1,2,3,4,5.

What can I do in order to iterate over all possible values for each element?
For instance, the sequence of the list I want to have would be
[1,1,1,1,1]
[1,1,1,1,2]
[1,1,1,1,3]

....

[5,5,5,5,4]
[5,5,5,5,5]

How can I make it happen?

Thanks,
Justin.


From python at mrabarnett.plus.com  Tue Mar 30 17:41:31 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 30 Mar 2010 22:41:31 +0100
Subject: decorators only when __debug__ == True
In-Reply-To: <7778821c-84f3-4829-8e05-85134c5d6c5b@y17g2000yqd.googlegroups.com>
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>	<mailman.1295.1269912866.23598.python-list@python.org>
	<7778821c-84f3-4829-8e05-85134c5d6c5b@y17g2000yqd.googlegroups.com>
Message-ID: <4BB2700B.90200@mrabarnett.plus.com>

LX wrote:
> On Mar 29, 6:34 pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
>> LX wrote:
>>> Hi all, I have a question about decorators. I would like to use them
>>> for argument checking, and pre/post conditions. However, I don't want
>>> the additional overhead when I run in non-debug mode. I could do
>>> something like this, using a simple trace example.
>>> @decorator
>>> def pass_decorator(f, *args, **kw): # what about the slow-down that
>>> incurs when using pass_decorator?
>>>     return f(*args, **kw)
>>> @decorator
>>> def trace_decorator(f, *args, **kw):
>>>     print "calling %s with args %s, %s" % (f.func_name, args, kw)
>>>     return f(*args, **kw)
>>> trace_enable_flag = False #__debug__
>>> trace = trace_decorator if trace_enable_flag else pass_decorator
>>> Trouble is, there is still an additional encapsulating function call.
>>> Is there any way to eliminate the extra function call altogether?
>>> Thanks in advance!
>> I think you have misunderstood certain details about decorators.
>>
>> This code with a decorator:
>>
>>      @decorator
>>      def hello():
>>          print "hello world"
>>
>> basically does this:
>>
>>      def hello():
>>          print "hello world"
>>      hello = decorator(hello)
>>
>> so your non-decorator just needs to return the function it was passed:
>>
>>      def pass_decorator(func):
>>          return func
>>
>> and your trace decorator would be something like this:
>>
>>      def trace_decorator(func):
>>          def show(*args, **kwargs):
>>              print "calling %s with args %s, %s" % (func.func_name,
>> args, kwargs)
>>              result = func(*args, **kwargs)
>>              print "returning %s from %s" % (result, func.func_name)
>>              return result
>>          return show
> 
> Sure, but during runtime, pass_decorator will still be called, even
> though it doesn't do anything. I am wondering if I can disable this
> additional function call at non-debug runtime. In other words, I want
> the calling stack to contain no decorator at all, not even
> pass_decorator.
> 
> I should mention that, in my code, the symbol "decorator" is imported
> from Michele Simionato's decorator.py file.

pass_decorator will be called when the decorated function is _defined_,
but not when the decorated function is _called_.


From python at mrabarnett.plus.com  Tue Mar 30 17:43:04 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Tue, 30 Mar 2010 22:43:04 +0100
Subject: (a==b) ? 'Yes' : 'No'
In-Reply-To: <20100330221600.42cd3536@vulcan.local>
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>	<mailman.1317.1269964918.23598.python-list@python.org>	<4bb22b39$0$1638$742ec2ed@news.sonic.net>	<mailman.1326.1269971785.23598.python-list@python.org>	<20100330201609.6ef12ee1@vulcan.local>	<87sk7h8vns.fsf@castleamber.com>
	<20100330221600.42cd3536@vulcan.local>
Message-ID: <4BB27068.9020009@mrabarnett.plus.com>

Robert Fendt wrote:
> And thus spake John Bokma <john at castleamber.com>
> Tue, 30 Mar 2010 13:19:19 -0600:
> 
>> And
>>
>>  a == b and 'Yes' or 'No' 
>>
>> isn't a Perl-ism?
> 
> I never said that this would be better. I don't even get the
> point of what the advantage is supposed to be of inverting the
> order of the return statement and the conditional check what
> should actually _be_ returned. What's wrong with just writing
> 
> if a==b:
>   return 'Yes'
> else:
>   return 'No'
> 
> apart from it being a few more line breaks and an additional
> return statement? The inverted form is not more readable per
> se (in fact, quite the opposite), and I would even suggest to
> minimise its use even in languages like C++ and Java. The Python
> syntax is even worse since it not only inverts the order of
> return statement and conditional check, but it also puts the
> conditional between the two results.
> 
> I find such a convoluted construct especially ugly in a language
> which I previously regarded as having a rather striking beauty
> of syntactical simplicity. The construct is superfluous,
> illogical, unelegant, and thus very un-pythonesque, IMHO. But of
> course that's just my $0.02.
> 
I think you mean that it's very _un-Pythonic_ (perhaps because it's very
very Pythonesque)! :-)

>> Sheesh, this group would be so much nicer without the constant dragging
>> in of Perl to make a point. On top of that, do {  } unless blocks are
>> not idomatic in Perl. Perl Best Practices even clearly states to *never*
>> use unless.
> 
> Sorry, but you have just underlined my point, in fact. If it's
> discouraged by experts, then of course the question must be
> valid why such a feature even exists (okay, apart from 'it
> seemed like a good idea at the time'). And more importantly (and
> more on-topic here), why we have to have an analogon in Python.
> 



From no.spam at local.local  Tue Mar 30 17:47:27 2010
From: no.spam at local.local (Robert Fendt)
Date: Tue, 30 Mar 2010 23:47:27 +0200
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
	<mailman.1326.1269971785.23598.python-list@python.org>
	<20100330201609.6ef12ee1@vulcan.local>
	<87sk7h8vns.fsf@castleamber.com>
	<20100330221600.42cd3536@vulcan.local>
	<mailman.1334.1269985381.23598.python-list@python.org>
Message-ID: <20100330234727.25bcbda8@vulcan.local>

And thus spake MRAB <python at mrabarnett.plus.com>
Tue, 30 Mar 2010 22:43:04 +0100:

> I think you mean that it's very _un-Pythonic_ (perhaps because it's very
> very Pythonesque)! :-)

Yes. Of course. What was I thinking. ;-)

Regards,
Robert



From mail at hellmutweber.de  Tue Mar 30 17:49:24 2010
From: mail at hellmutweber.de (Hellmut Weber)
Date: Tue, 30 Mar 2010 23:49:24 +0200
Subject: logging: local functions ==> loss of lineno
In-Reply-To: <b02720d8-a1b5-4133-a018-b3dd613be8e3@q21g2000yqm.googlegroups.com>
References: <mailman.576.1268256192.23598.python-list@python.org>
	<hnaj9c$i0u$02$1@news.t-online.com>
	<4BA295A1.70207@hellmutweber.de>
	<mailman.972.1268995215.23598.python-list@python.org>	<hnvqe5$vc$02$1@news.t-online.com>
	<mailman.977.1269006574.23598.python-list@python.org>	<ho21dt$b6v$00$1@news.t-online.com>
	<d35c950b-c6e5-4162-8175-3e0a0255c71a@30g2000yqi.googlegroups.com>
	<hocmak$ap$00$1@news.t-online.com>
	<b02720d8-a1b5-4133-a018-b3dd613be8e3@q21g2000yqm.googlegroups.com>
Message-ID: <4BB271E4.4000505@hellmutweber.de>

Hi Peter and Jean-Michel,
thanks for all your hints and pieces of code.

It took me a while to play around with what I got from you (and some 
study of Vinay's module documentation.

Now I have come up with a more complete solution I'm quite satisfied 
with. And I would be very glad to receive your comments on my code 
indicating what I could do better, given that I'm still at the very 
beginning with python.


Cheers + TIA

Hellmut


Here is my module and a corresponding test program:

leo at sylvester hw_logg $ cat loc_logg.py 

#!/bin/env python 

# -*- coding: utf-8 -*- 

"""Hw's local logging module 


To be done:
   Factorize 'trace' decorator to own module
     (to permit dependency on debug level) ???
"""

import sys # Basic system functions

import logging # Logging base
import logging.handlers

import inspect # monkey patch caller filename

# --- color change strings for terminal output ---
#
pc_yell = '\033[01;93m'
pc_purp = '\033[01;33m'
pc_gren = '\033[01;92m'
pc_blue = '\033[01;94m'
#
pc_bold = '\033[01;1m'
pc_norm = '\033[0m'
#
pc_reed = '\033[01;91m'
pc_cyan = '\033[01;96m'

level_color = {
   'fatal': pc_yell,
   'error': pc_yell,
   'warning': pc_purp,
   'info': pc_gren,
   'debug': pc_blue,
   'bold': pc_bold,
   'normal': pc_norm
   }

# --- define string building help function ---
#
def argskw_2_string(*args, **kwargs):
   """Generate String from *args and **kwargs

   Return string with
     *args list (comma separated) in first line
     **kwargs key=val list (comma separated) in second line
   """
   _str_lines = []

   if args:
     _args_strings = ''
     for a in args:
       _args_strings += str(a) + ', '
     _str_lines.append(_args_strings)

   if kwargs:
     _kwargs_strings = ''
     for k in kwargs:
       _kwargs_strings += str(k)+' = '+str(kwargs[k]) + ', '
     _str_lines.append(_kwargs_strings)
   return ''.join(_str_lines)


# --- Class for all logging functionality ---
#
class locLogg():
   _logger = None

   def __init__(self, newlogg=None):
     if not locLogg._logger:
       locLogg._logger = newlogg

   def init_logging(self,
     loclogg_output='line', # stream or/and file
     loclogg_fname='loggfile.txt',
     loclogg_dblevel='DEBUG'
     ):
     """Initiate logging with locLogg._logger

     Defines the logging handler to be used
     and initiates it.

     Possible values for loclogg_output:
       line ==> output to console
       file ==> log_file must be given
       both ==> log_file must be given
       null ==> no logging (NullHandler)
     """
     locLogg._logger.handlers=[]
     if loclogg_output in ('null'):
       class NullHandler(logging.Handler):
         def emit(self, record):
           pass
       locLogg._logger.addHandler(NullHandler())
     if loclogg_output in ('line', 'both'):
       locLogg._logger.addHandler(logging.StreamHandler())
     if loclogg_output in ('file', 'both'):
       locLogg._logger.addHandler(
           logging.handlers.RotatingFileHandler(loclogg_fname,
                maxBytes=200000, backupCount=5)
           )
     for _loc_logger in locLogg._logger.handlers:
       _loc_logger.setFormatter(logging.Formatter(
           '%(asctime)s ' + \
           '%(custom_filename)s <%(custom_lineno)d>:' + \
           '%(levelname)s %(message)s'))
     # Can this be done better ?
     _loc_levels = {'NOTSET': 0, 'DEBUG': 10,
         'INFO': 20, 'WARNING': 30, 'ERROR': 40, 'CRITICAL': 50}
     locLogg._logger.setLevel(_loc_levels[loclogg_dblevel])

   def info_log(self, msg, *args, **kwargs):
     previousFrame = inspect.currentframe().f_back
     locLogg._logger.info(str(level_color['info'])+msg+pc_norm + \
       ' ' + argskw_2_string(*args, **kwargs),
       extra={'custom_lineno': previousFrame.f_lineno,
         'custom_filename': previousFrame.f_code.co_filename })

   def debug_log(self, msg, *args, **kwargs):
     previousFrame = inspect.currentframe().f_back
     locLogg._logger.debug(str(level_color['debug'])+msg+pc_norm + \
       ' ' + argskw_2_string(*args, **kwargs),
       extra={'custom_lineno':previousFrame.f_lineno,
         'custom_filename': previousFrame.f_code.co_filename })

   def warn_log(self, msg, *args, **kwargs):
     previousFrame = inspect.currentframe().f_back
     locLogg._logger.debug(str(level_color['warning'])+msg+pc_norm + \
       ' ' + argskw_2_string(*args, **kwargs),
       extra={'custom_lineno':previousFrame.f_lineno,
         'custom_filename': previousFrame.f_code.co_filename })

   def error_log(self, msg, *args, **kwargs):
     previousFrame = inspect.currentframe().f_back
     locLogg._logger.error(str(level_color['error'])+msg+pc_norm + \
       ' ' + argskw_2_string(*args, **kwargs),
       extra={'custom_lineno':previousFrame.f_lineno,
         'custom_filename': previousFrame.f_code.co_filename })

   def fatal_log(self, msg, *args, **kwargs):
     previousFrame = inspect.currentframe().f_back
     locLogg._logger.fatal(str(level_color['fatal'])+msg+pc_norm + \
       ' ' + argskw_2_string(*args, **kwargs),
       extra={'custom_lineno':previousFrame.f_lineno,
         'custom_filename': previousFrame.f_code.co_filename })

# --- Permit definition of a tracing decorator ---
from decorator import decorator

@decorator
def trace(f, *args, **kw):
   print "@trace: calling %s with args %s, %s" % (f.func_name, args, kw)
   return f(*args, **kw)
# cf. doc of Michele Simoniato's decorator module


if __name__ == '__main__':

   _logger = logging.getLogger('jmp_logg__main__')
   foo = locLogg(_logger)
   foo.init_logging()

   foo.info_log('a foo info')
   foo.info_log('another bar info', 1,2,3, a=11, b=22, c=44)
   foo.debug_log('a debug bar info', 'a', '1aA', qwe=2, asd=99)
   foo.warn_log('a test info', 'ggg', '2U2', yxcv=2, asdf=99)

   try:
     b = 123
     c = 0
     a = b / c
   except:
     foo.fatal_log('Division by zero', b=123, c=0)

leo at sylvester hw_logg $ cat test_loclogg.py
#!/bin/env python
# -*- coding: utf-8 -*-

import logging
_logger = logging.getLogger()

import sys
pyDevelDir = '/home/leo/leo/brbeit/py-devel/Modules'
sys.path.append(pyDevelDir)

from hw_logg.loc_logg import locLogg
foo = locLogg(_logger)
foo.init_logging(
     loclogg_output='both',
     loclogg_dblevel='DEBUG')

import loc_module as jm

foo.info_log('First info with args in string: %d %d %d' % (1,2,3))
foo.warn_log('First warning')
foo.debug_log('First debug message TestTestTest', '----------', 4,5,6, 
12*25, d=34, e='qwe')

foo.debug_log('Before calling jm.doIt()')
jm.doIt(True)

foo.info_log('Second info with kwargs separate:', a=11,b=22,c=33)

x = jm.MyClass(1, 2, 'abc')
x.mymethod()
x.mymethod(123, 234, a=1, b=2, c=3)

try:
   jm.doIt(0)
except Exception, e:
   foo.error_log(str(e), 1,5,8)
   foo.fatal_log('Fatal message')

leo at sylvester hw_logg $ cat loc_module.py
# -*- coding: utf-8 -*-

import logging
_logger = logging.getLogger('jmp_logger')

import sys
pyDevelDir = '/home/leo/leo/brbeit/py-devel/Modules'
sys.path.append(pyDevelDir)

from hw_logg.loc_logg import locLogg, trace
foo = locLogg(_logger)

foo.info_log("Start importing "+__name__)

def doIt(yn=None):
     foo.debug_log("doin' stuff, yn =", str(yn)) # logLevel at calling 
point !
     print '=====> Output from doIt:', yn
     #do stuff...but suppose an error occurs?
     if yn:
       foo.info_log('yn: good value')
     else:
       raise TypeError, "bogus type error for testing"

class MyClass(object):
   @trace
   def __init__(self, *args, **kwargs):
     print 'MyClass.__init__'
   @trace
   def mymethod(self, *args, **kwargs):
     print 'MyClass.mymethod'

foo.info_log("End   importing "+__name__)

-- 
Dr. Hellmut Weber         mail at hellmutweber.de
Degenfeldstra?e 2         tel   +49-89-3081172
D-80803 M?nchen-Schwabing mobil +49-172-8450321
please: No DOCs, no PPTs. why: tinyurl.com/cbgq



From darcy at druid.net  Tue Mar 30 17:50:56 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Tue, 30 Mar 2010 17:50:56 -0400
Subject: psycopg2 / psycopg2.DataError: invalid input syntax for type 
	timestamp with time zone:
In-Reply-To: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>
References: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>
Message-ID: <20100330175056.ca69563c.darcy@druid.net>

On Tue, 30 Mar 2010 13:47:42 -0700 (PDT)
ASh <anton.shishkov at gmail.com> wrote:
> Hi, please help me understand why am I getting error with this query
> 
> 
>             new_start_date = "NOW() - '29 days'::INTERVAL"
>             self.dyndb.orderdb.query('''update xxxx set creation_date
> = %s
>             where id_order = %s''', (new_start_date, "123"))

Put single quotes around the first %s in the query.

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


From robert.kern at gmail.com  Tue Mar 30 17:58:34 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 30 Mar 2010 16:58:34 -0500
Subject: A question about making a sort-of-counter.
In-Reply-To: <4BB26DCE.7070307@rice.edu>
References: <4BB26DCE.7070307@rice.edu>
Message-ID: <hots6b$egm$1@dough.gmane.org>

On 2010-03-30 16:31 PM, Justin Park wrote:
> Suppose I have a list.
> a = list()
> And suppose allowed digits as the element are 1,2,3,4,5.
>
> What can I do in order to iterate over all possible values for each element?
> For instance, the sequence of the list I want to have would be
> [1,1,1,1,1]
> [1,1,1,1,2]
> [1,1,1,1,3]
>
> ....
>
> [5,5,5,5,4]
> [5,5,5,5,5]
>
> How can I make it happen?

def counter(n=5, length=5):
     for i in xrange(n ** length):
         x = []
         for j in range(length):
             i, r = divmod(i, n)
             x.append(r)
         yield [k+1 for k in x[::-1]]

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From anon at blank.com  Tue Mar 30 18:00:13 2010
From: anon at blank.com (anon)
Date: Tue, 30 Mar 2010 23:00:13 +0100
Subject: A question about making a sort-of-counter.
In-Reply-To: <mailman.1332.1269985213.23598.python-list@python.org>
References: <mailman.1332.1269985213.23598.python-list@python.org>
Message-ID: <Qvusn.336199$2R.198964@newsfe11.ams2>

Justin Park wrote:
> Suppose I have a list.
> a = list()
> And suppose allowed digits as the element are 1,2,3,4,5.
> 
> What can I do in order to iterate over all possible values for each element?
> For instance, the sequence of the list I want to have would be
> [1,1,1,1,1]
> [1,1,1,1,2]
> [1,1,1,1,3]
> 
> ....
> 
> [5,5,5,5,4]
> [5,5,5,5,5]
> 
> How can I make it happen?
> 
> Thanks,
> Justin.


http://docs.python.org/library/itertools.html#itertools.product

from itertools import product

for item in product([1, 2], repeat=2):
     print item


From invalid at invalid.invalid  Tue Mar 30 18:01:14 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Tue, 30 Mar 2010 22:01:14 +0000 (UTC)
Subject: Can't get odtwriter to work
Message-ID: <hotsba$615$1@reader1.panix.com>

I just installed odtwriter 1.3d on a Gentoo system running Python
2.6.4.  I used the normal "python setup.py build" then "python
setup.py install" method. But, odtwriter doesn't seem to work:

    rst2odt.py --help

    Traceback (most recent call last):
      File "/usr/bin/rst2odt.py", line 5, in <module>
        pkg_resources.run_script('odtwriter==1.3d', 'rst2odt.py')
      File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 461, in run_script
        self.require(requires)[0].run_script(script_name, ns)
      File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 1194, in run_script
        execfile(script_filename, namespace, namespace)
      File "/usr/lib/python2.6/site-packages/odtwriter-1.3d-py2.6.egg/EGG-INFO/scripts/rst2odt.py", line 21, in <module>
        from docutils.writers.odtwriter import Writer, Reader
    ImportError: No module named odtwriter

I verified that I have docutils installed:

    Python 2.6.4 (r264:75706, Mar  1 2010, 10:33:43) 
    [GCC 4.1.2 (Gentoo 4.1.2 p1.1)] on linux2
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import docutils
    >>> docutils
    <module 'docutils' from '/usr/lib/python2.6/site-packages/docutils/__init__.pyc'>

What am I doing wrong?    

-- 
Grant Edwards               grant.b.edwards        Yow! LOOK!!  Sullen
                                  at               American teens wearing
                              gmail.com            MADRAS shorts and "Flock of
                                                   Seagulls" HAIRCUTS!


From crebert at ucsd.edu  Tue Mar 30 18:08:17 2010
From: crebert at ucsd.edu (Chris Rebert)
Date: Tue, 30 Mar 2010 15:08:17 -0700
Subject: A question about making a sort-of-counter.
In-Reply-To: <4BB26DCE.7070307@rice.edu>
References: <4BB26DCE.7070307@rice.edu>
Message-ID: <50697b2c1003301508w7dca3ab0pb9468a7a90afdd45@mail.gmail.com>

On Tue, Mar 30, 2010 at 2:31 PM, Justin Park <hp6 at rice.edu> wrote:
> Suppose I have a list.
> a = list()
> And suppose allowed digits as the element are 1,2,3,4,5.
>
> What can I do in order to iterate over all possible values for each element?
> For instance, the sequence of the list I want to have would be
> [1,1,1,1,1]
> [1,1,1,1,2]
> [1,1,1,1,3]
>
> ....
>
> [5,5,5,5,4]
> [5,5,5,5,5]
>
> How can I make it happen?

allowed = range(1,6)
length = 5
for counter_tuple in product(allowed, repeat=length):
    counter_list = list(counter_tuple) # if you really need a list
    #do whatever with the counter value

See the docs for itertools.product(); an example virtually identical
to your situation is given:
http://docs.python.org/library/itertools.html#itertools.product

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


From hp6 at rice.edu  Tue Mar 30 18:12:28 2010
From: hp6 at rice.edu (Justin Park)
Date: Tue, 30 Mar 2010 17:12:28 -0500
Subject: A question about making a sort-of-counter.
In-Reply-To: <50697b2c1003301508w7dca3ab0pb9468a7a90afdd45@mail.gmail.com>
References: <4BB26DCE.7070307@rice.edu>
	<50697b2c1003301508w7dca3ab0pb9468a7a90afdd45@mail.gmail.com>
Message-ID: <4BB2774C.7040906@rice.edu>

Thanks!
It works!

Justin.

Chris Rebert wrote:
> On Tue, Mar 30, 2010 at 2:31 PM, Justin Park <hp6 at rice.edu> wrote:
>   
>> Suppose I have a list.
>> a = list()
>> And suppose allowed digits as the element are 1,2,3,4,5.
>>
>> What can I do in order to iterate over all possible values for each element?
>> For instance, the sequence of the list I want to have would be
>> [1,1,1,1,1]
>> [1,1,1,1,2]
>> [1,1,1,1,3]
>>
>> ....
>>
>> [5,5,5,5,4]
>> [5,5,5,5,5]
>>
>> How can I make it happen?
>>     
>
> allowed = range(1,6)
> length = 5
> for counter_tuple in product(allowed, repeat=length):
>     counter_list = list(counter_tuple) # if you really need a list
>     #do whatever with the counter value
>
> See the docs for itertools.product(); an example virtually identical
> to your situation is given:
> http://docs.python.org/library/itertools.html#itertools.product
>
> Cheers,
> Chris
> --
> http://blog.rebertia.com
>
>   


From apt.shansen at gmail.invalid  Tue Mar 30 18:17:28 2010
From: apt.shansen at gmail.invalid (Stephen Hansen)
Date: Tue, 30 Mar 2010 15:17:28 -0700
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
	<mailman.1326.1269971785.23598.python-list@python.org>
	<20100330201609.6ef12ee1@vulcan.local>
	<87sk7h8vns.fsf@castleamber.com>
	<20100330221600.42cd3536@vulcan.local>
Message-ID: <2010033015172862741-aptshansen@gmailinvalid>

On 2010-03-30 13:16:00 -0700, Robert Fendt said:
> 
> I find such a convoluted construct especially ugly in a language
> which I previously regarded as having a rather striking beauty
> of syntactical simplicity. The construct is superfluous,
> illogical, unelegant, and thus very un-pythonesque, IMHO. But of
> course that's just my $0.02.

In Python before list-comprehensions, I might have agreed with you. 
Initially, I was quite resistant to list comprehensions as well. They 
seemed ugly, and backwards, and why not just write a for loop?

Then I got used to them, and I find they are very elegant when used 
properly. Sometimes you can do something ugly with them, but its 
actually quite possible to write positively hideous Python even without 
any of these new fancy shmancy features.

But, in the post-comprehension world, where one can do:

my_odds = [x for x in range(100) if x % 2 == 1]

Things have changed. I've now grown used to reading expressions like 
that which seem a bit backwards, with the value being returned by an 
expression is the left-most element. Its not an exact correlation 
because they're answering different problems.

But having gotten used to list comprehensions, and actually quite 
appreciating their elegance now, I find this reads very well:

is_odd = "odd" if x % 2 == 1 else "even"

In fact, it reads better then any of the other conditional expression 
syntaxes people proposed back in the day, and a LOT better then what 
was done before:

is_odd = x % 2 == 1 and "odd" or "even"

Even if the above falls a bit more in line with what other languages 
usually do order-wise, this isn't other languages.

Now, none of this addresses your original argument of why not just use 
a regular if statement.

I dunno, I often used "and/or" for simple expressions or defaults and 
found it very convienent and made code more readable then the line and 
whitespace inducing true if-statement. And so I'm glad to have 
something even more readable and without the bug-prone and/or error.

Why not just use a for loop anytime you use a list comprehension? :) 
Same question really applies.

-- 
--S

... p.s: change the ".invalid" to ".com" in email address to reply privately.



From invalid at invalid.invalid  Tue Mar 30 18:20:29 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Tue, 30 Mar 2010 22:20:29 +0000 (UTC)
Subject: Can't get odtwriter to work
References: <hotsba$615$1@reader1.panix.com>
Message-ID: <hottfd$mdd$1@reader1.panix.com>

On 2010-03-30, Grant Edwards <invalid at invalid.invalid> wrote:

> I just installed odtwriter 1.3d on a Gentoo system running Python
> 2.6.4.  I used the normal "python setup.py build" then "python
> setup.py install" method. But, odtwriter doesn't seem to work:
>
>     rst2odt.py --help
>
>     Traceback (most recent call last):
>       File "/usr/bin/rst2odt.py", line 5, in <module>
>         pkg_resources.run_script('odtwriter==1.3d', 'rst2odt.py')
>       File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 461, in run_script
>         self.require(requires)[0].run_script(script_name, ns)
>       File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 1194, in run_script
>         execfile(script_filename, namespace, namespace)
>       File "/usr/lib/python2.6/site-packages/odtwriter-1.3d-py2.6.egg/EGG-INFO/scripts/rst2odt.py", line 21, in <module>
>         from docutils.writers.odtwriter import Writer, Reader
>     ImportError: No module named odtwriter
>
> I verified that I have docutils installed:
>
>     Python 2.6.4 (r264:75706, Mar  1 2010, 10:33:43) 
>     [GCC 4.1.2 (Gentoo 4.1.2 p1.1)] on linux2
>     Type "help", "copyright", "credits" or "license" for more information.
>     >>> import docutils
>     >>> docutils
>     <module 'docutils' from '/usr/lib/python2.6/site-packages/docutils/__init__.pyc'>
>
> What am I doing wrong?    

I'm not sure what/if I did wrong when installing docutils/odtwriter,
but I managed to make it work by manually copying everything from

  /usr/lib/python2.6/site-packages/odtwriter-1.3d-py2.6.egg/docutils/writers

    to

  /usr/lib/python2.6/site-packages/docutils/writers 

I think that means that odtwriter's setup.py is old/broken, but I
don't know enough to fix it...

-- 
Grant Edwards               grant.b.edwards        Yow! I'm having a MID-WEEK
                                  at               CRISIS!
                              gmail.com            


From no.spam at local.local  Tue Mar 30 18:32:41 2010
From: no.spam at local.local (Robert Fendt)
Date: Wed, 31 Mar 2010 00:32:41 +0200
Subject: "Usability, the Soul of Python"
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
	<4bb14173$0$1640$742ec2ed@news.sonic.net>
	<mailman.1300.1269939807.23598.python-list@python.org>
	<hosnrh$6na$1@news.eternal-september.org>
Message-ID: <20100331003241.47fa91f6@vulcan.local>

And thus spake "Alf P. Steinbach" <alfps at start.no>
Tue, 30 Mar 2010 13:40:22 +0200:

> <quote>
>  From a usability standpoint, the braces go with the lines to print out the 
> stanza rather than the for statement or the code after, so the following is best:
> 
> for(i = 99; i > 0; ++i)
>      {
>      printf("%d slabs of spam in my mail!\n", i);
>      printf("%d slabs of spam,\n", i);
>      printf("Send one to abuse and Just Hit Delete,\n");
>      printf("%d slabs of spam in my mail!\n\n", i + 1);
>      }
> </quote>

I liked this one even more:

<quote>
One way of writing the same code in Python would be:

count = 99
while count > 0:
    print u'%d slabs of spam in my mail!' % count
    print u'%d slabs of spam,' % count
    print u'Send one to abuse and Just Hit Delete,'
    count += 1
    print u'%d slabs of spam in my mail!' % count
    print u''

The braces are gone, and with them the holy wars. Whatever brace
styles Python programmers may happen to use in languages with
braces, all the Python code looks the same, and while the major
brace styles illustrated above are a few of many ways the C code
could be laid out, there's only one real way to do it.
</quote>

Has the fact changed that Python does not care about (1) how
many characaters you use for indentation, (1a) you can use tabs
OR spaces, (2) indentation does not have to be consistent across
a module, (3) not even across a file, (4) even in nested blocks
and (5) you can even switch from spaces to tabs and back in the
same file? So much for 'all the Python code looks the same'.

In general I do not really see what qualifies the author for an
article on Python's usability. On the same site one can also
find a lot of things e.g. on intelligent design and creationism,
and the 'The Case For Uncreative Web Design' in which the author
advocates 'uncreative' (in the sense of non-distracting) web
design while at the same time showcasing quite the opposite:
suffice it to say I found most essays rather difficult to read
from a technical point of view, to say nothing about the content.

Regards,
Robert



From anton.shishkov at gmail.com  Tue Mar 30 18:45:03 2010
From: anton.shishkov at gmail.com (ASh)
Date: Tue, 30 Mar 2010 15:45:03 -0700 (PDT)
Subject: psycopg2 / psycopg2.DataError: invalid input syntax for type 
	timestamp with time zone:
References: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>
	<mailman.1331.1269984417.23598.python-list@python.org>
Message-ID: <d0de705c-c9c8-45e4-894f-2ea56219fb86@30g2000yqi.googlegroups.com>

On Mar 31, 12:26?am, Philip Semanchuk <phi... at semanchuk.com> wrote:
> On Mar 30, 2010, at 4:47 PM, ASh wrote:
>
> > Hi, please help me understand why am I getting error with this query
>
> > ? ? ? ? ? ?new_start_date = "NOW() - '29 days'::INTERVAL"
> > ? ? ? ? ? ?self.dyndb.orderdb.query('''update xxxx set creation_date
> > = %s
> > ? ? ? ? ? ?where id_order = %s''', (new_start_date, "123"))
>
> > ...
> > psycopg2.DataError: invalid input syntax for type timestamp with time
> > zone: "NOW() - '29 days'::INTERVAL"
>
> Hi Anton,
> It sounds to me like the problem is with your SQL rather than with ?
> psycopg2 or Python. Try the query directly in Postgres -- does it work ?
> there? If so, then your next step should be to ask on the psycopg2 ?
> mailing list that Google can find for you.
>
> Good luck
> Philip

sql itself is correct


From anton.shishkov at gmail.com  Tue Mar 30 18:46:12 2010
From: anton.shishkov at gmail.com (ASh)
Date: Tue, 30 Mar 2010 15:46:12 -0700 (PDT)
Subject: psycopg2 / psycopg2.DataError: invalid input syntax for type 
	timestamp with time zone:
References: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>
	<mailman.1336.1269985882.23598.python-list@python.org>
Message-ID: <e9994806-5a52-4b9a-a4fe-66cf6625e3c9@l25g2000yqd.googlegroups.com>

On Mar 31, 12:50?am, "D'Arcy J.M. Cain" <da... at druid.net> wrote:
> On Tue, 30 Mar 2010 13:47:42 -0700 (PDT)
>
> ASh <anton.shish... at gmail.com> wrote:
> > Hi, please help me understand why am I getting error with this query
>
> > ? ? ? ? ? ? new_start_date = "NOW() - '29 days'::INTERVAL"
> > ? ? ? ? ? ? self.dyndb.orderdb.query('''update xxxx set creation_date
> > = %s
> > ? ? ? ? ? ? where id_order = %s''', (new_start_date, "123"))
>
> Put single quotes around the first %s in the query.
>
> --
> D'Arcy J.M. Cain <da... at druid.net> ? ? ? ? | ?Democracy is three wolveshttp://www.druid.net/darcy/? ? ? ? ? ? ? ?| ?and a sheep voting on
> +1 416 425 1212 ? ? (DoD#0082) ? ?(eNTP) ? | ?what's for dinner.

Tried like you said, got this error:

psycopg2.ProgrammingError: syntax error at or near "NOW"
LINE 1: update orderdb.orders set creation_date = 'E'NOW() - ''29
da...
                                                     ^


From hp6 at rice.edu  Tue Mar 30 18:50:18 2010
From: hp6 at rice.edu (Justin Park)
Date: Tue, 30 Mar 2010 17:50:18 -0500
Subject: Sometimes the python shell cannot recognize the presence of an
	attribute. 
Message-ID: <4BB2802A.7050500@rice.edu>

Sometimes when I am working on an already generated package,
the python shell cannot perceive the presence of an attribute that I
implemented on top of what was there.

Is there a way to have it perceive newly created attributes?

Thanks,
Justin.


From hp6 at rice.edu  Tue Mar 30 18:57:37 2010
From: hp6 at rice.edu (Justin Park)
Date: Tue, 30 Mar 2010 17:57:37 -0500
Subject: Sometimes the python shell cannot recognize the presence of an
	attribute.
In-Reply-To: <4BB2802A.7050500@rice.edu>
References: <4BB2802A.7050500@rice.edu>
Message-ID: <4BB281E1.2030101@rice.edu>

Sorry, my mistake.

The real problem is this.
When I started working on the package, somehow all of indentations were
made by space-bars instead of using tabs.
But when I am implementing my own on top of it, I still use tabs to make
indentations.

This is causing a problem.
I have to either conform to their style and change all my tabs to the
space-bars making up those spaces,
or change all indentations in the previous implementations by tabs.
But both the previous implementations and what I am going to do are also
so large that either way is not going to be efficient.

What can I do in order to resolve this issue?

Thanks,
Justin.

Justin Park wrote:
> Sometimes when I am working on an already generated package,
> the python shell cannot perceive the presence of an attribute that I
> implemented on top of what was there.
>
> Is there a way to have it perceive newly created attributes?
>
> Thanks,
> Justin.
>
>   


From ldo at geek-central.gen.new_zealand  Tue Mar 30 19:18:21 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 31 Mar 2010 12:18:21 +1300
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<7316f3d2-bcc9-4a1a-8598-cdd5d41fd74b@k17g2000yqb.googlegroups.com>
Message-ID: <hou0rt$69n$2@lust.ihug.co.nz>

In message <7316f3d2-bcc9-4a1a-8598-
cdd5d41fd74b at k17g2000yqb.googlegroups.com>, Joaquin Abian wrote:

> (a==b) and 'YES' or 'NO'
> 
> Yes, ugly

Why would you say that?s ugly?

By the way, you don?t need the parentheses.


From clp2 at rebertia.com  Tue Mar 30 19:20:32 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 30 Mar 2010 16:20:32 -0700
Subject: "Usability, the Soul of Python"
In-Reply-To: <20100331003241.47fa91f6@vulcan.local>
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
	<4bb14173$0$1640$742ec2ed@news.sonic.net>
	<mailman.1300.1269939807.23598.python-list@python.org>
	<hosnrh$6na$1@news.eternal-september.org>
	<20100331003241.47fa91f6@vulcan.local>
Message-ID: <50697b2c1003301620j376e4787xa8763cb0d21bd2f1@mail.gmail.com>

On Tue, Mar 30, 2010 at 3:32 PM, Robert Fendt <no.spam at local.local> wrote:
> And thus spake "Alf P. Steinbach" <alfps at start.no>
> Tue, 30 Mar 2010 13:40:22 +0200:
>> <quote>
>> ?From a usability standpoint, the braces go with the lines to print out the
>> stanza rather than the for statement or the code after, so the following is best:
>>
>> for(i = 99; i > 0; ++i)
>> ? ? ?{
>> ? ? ?printf("%d slabs of spam in my mail!\n", i);
>> ? ? ?printf("%d slabs of spam,\n", i);
>> ? ? ?printf("Send one to abuse and Just Hit Delete,\n");
>> ? ? ?printf("%d slabs of spam in my mail!\n\n", i + 1);
>> ? ? ?}
>> </quote>
>
> I liked this one even more:
>
> <quote>
> One way of writing the same code in Python would be:
>
> count = 99
> while count > 0:
> ? ?print u'%d slabs of spam in my mail!' % count
> ? ?print u'%d slabs of spam,' % count
> ? ?print u'Send one to abuse and Just Hit Delete,'
> ? ?count += 1
> ? ?print u'%d slabs of spam in my mail!' % count
> ? ?print u''
>
> The braces are gone, and with them the holy wars. Whatever brace
> styles Python programmers may happen to use in languages with
> braces, all the Python code looks the same, and while the major
> brace styles illustrated above are a few of many ways the C code
> could be laid out, there's only one real way to do it.
> </quote>
>
> Has the fact changed that Python does not care about (1) how
> many characaters you use for indentation, (1a) you can use tabs
> OR spaces, (2) indentation does not have to be consistent across
> a module, (3) not even across a file, (4) even in nested blocks
> and (5) you can even switch from spaces to tabs and back in the
> same file? So much for 'all the Python code looks the same'.

Since we're harping on block delimitation, I'll plug a post I did on
the subject a little while ago:
http://blog.rebertia.com/2010/01/24/of-braces-and-semicolons/

Hopefully it's more thorough than the OP's.

Cheers,
Chris


From ldo at geek-central.gen.new_zealand  Tue Mar 30 19:23:46 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 31 Mar 2010 12:23:46 +1300
Subject: "Usability, the Soul of Python"
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
	<4bb14173$0$1640$742ec2ed@news.sonic.net>
	<mailman.1300.1269939807.23598.python-list@python.org>
	<hosnrh$6na$1@news.eternal-september.org>
	<20100331003241.47fa91f6@vulcan.local>
Message-ID: <hou162$69n$3@lust.ihug.co.nz>

In message <20100331003241.47fa91f6 at vulcan.local>, Robert Fendt wrote:

> The braces are gone, and with them the holy wars.

Let me start a new one. I would still put in some kind of explicit indicator 
of the end of the grouping construct:

    count = 99
    while count > 0:
        print u'%d slabs of spam in my mail!' % count
        print u'%d slabs of spam,' % count
        print u'Send one to abuse and Just Hit Delete,'
        count += 1
        print u'%d slabs of spam in my mail!' % count
        print u''
    #end while



From see at sig.for.address  Tue Mar 30 19:25:38 2010
From: see at sig.for.address (Victor Eijkhout)
Date: Tue, 30 Mar 2010 18:25:38 -0500
Subject: sort array, apply rearrangement to second
Message-ID: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>

I have two arrays, made with numpy. The first one has values that I want
to use as sorting keys; the second one needs to be sorted by those keys.
Obviously I could turn them into a dictionary  of pairs and sort by the
first member, but I think that's not very efficient, at least in space,
and this needs to be done as efficiently as possible.

I could use a hand.

Victor.
-- 
Victor Eijkhout -- eijkhout at tacc utexas edu


From ldo at geek-central.gen.new_zealand  Tue Mar 30 19:32:42 2010
From: ldo at geek-central.gen.new_zealand (Lawrence D'Oliveiro)
Date: Wed, 31 Mar 2010 12:32:42 +1300
Subject: "Usability, the Soul of Python"
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
	<4bb14173$0$1640$742ec2ed@news.sonic.net>
	<mailman.1300.1269939807.23598.python-list@python.org>
	<hosnrh$6na$1@news.eternal-september.org>
Message-ID: <hou1mr$6ur$1@lust.ihug.co.nz>

In message <hosnrh$6na$1 at news.eternal-september.org>, Alf P. Steinbach 
wrote:

> This is just unsubstantiated opinion, but worse, it makes a tacit
> assumption that there is "best" way to do indentation. However, most
> programmers fall into that trap, and I've done it myself.

Having used so many different languages over the years, I have settled on a 
reasonably common set of indentation conventions that work across most of 
them.

The only one that currently annoys me is JavaScript, because its semicolons-
are-optional rule means that certain ways I write statements continued 
across multiple lines are interpreted as prematurely completing the 
statement.

In revenge for that, I refuse to put optional semicolons in my JavaScript 
code altogether.

> I may or may not have been responsible for the similarly impractical
> compromise convention of using three spaces per indentation level. At
> least, in one big meeting the question about number of spaces was raised
> by the speaker, and I replied from the benches, just in jest, "three!".
> And that was it (perhaps).

I use four. Why four? Because it?s divisible by two. Because I use the half-
step (two columns) for lines containing nothing but bracketing symbols:

    for (i = 99; i > 0; --i)
       {
         printf("%d slabs of spam in my mail!\n", i);
         printf("%d slabs of spam,\n", i);
         printf("Send one to abuse and Just Hit Delete,\n");
         printf("%d slabs of spam in my mail!\n\n", i - 1);
       } /*for*/

    for i := 99 downto 1 do
      begin
         writeln(i, " slabs of spam in my mail!");
         writeln(i, " slabs of spam,");
         writeln("Send one to abuse and Just Hit Delete,");
         writeln(i - 1, " slabs of spam in my mail!\n\n")
      end {for}

Actually this looks like another opportunity for a loop-with-exit-in-the-
middle:

    for (i = 99;;)
      {
         printf("%d slabs of spam in my mail!\n", i);
         printf("%d slabs of spam,\n", i);
         printf("Send one to abuse and Just Hit Delete,\n");
         --i;
         if (i == 0)
            break;
         printf("%d slabs of spam in my mail!\n\n", i);
      } /*for*/



From hidura at gmail.com  Tue Mar 30 19:33:25 2010
From: hidura at gmail.com (hidura at gmail.com)
Date: Tue, 30 Mar 2010 23:33:25 +0000
Subject: Fetch files from mail in python
Message-ID: <0016e6470e5c57735f04830d0e5a@google.com>

Hello list, i want to know how could i fetch a file from an email, what  
kind of library i have to use for that, actually i am working in the  
support of IMAP and POP3.

Thanks.


Diego I. Hidalgo D.
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From clp2 at rebertia.com  Tue Mar 30 19:39:08 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 30 Mar 2010 16:39:08 -0700
Subject: Fetch files from mail in python
In-Reply-To: <0016e6470e5c57735f04830d0e5a@google.com>
References: <0016e6470e5c57735f04830d0e5a@google.com>
Message-ID: <50697b2c1003301639l4fa75583mc4b290b4c83664cf@mail.gmail.com>

On Tue, Mar 30, 2010 at 4:33 PM,  <hidura at gmail.com> wrote:
> Hello list, i want to know how could i fetch a file from an email, what kind
> of library i have to use for that, actually i am working in the support of
> IMAP and POP3.

Next time, consult the Global Module Index
(http://docs.python.org/modindex.html) before posting.

IMAP: http://docs.python.org/library/imaplib.html
POP: http://docs.python.org/library/poplib.html

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


From steve at holdenweb.com  Tue Mar 30 19:43:41 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 30 Mar 2010 19:43:41 -0400
Subject: (a==b) ? 'Yes' : 'No'
In-Reply-To: <hou0rt$69n$2@lust.ihug.co.nz>
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>	<7316f3d2-bcc9-4a1a-8598-cdd5d41fd74b@k17g2000yqb.googlegroups.com>
	<hou0rt$69n$2@lust.ihug.co.nz>
Message-ID: <hou2bh$1g0$1@dough.gmane.org>

Lawrence D'Oliveiro wrote:
> In message <7316f3d2-bcc9-4a1a-8598-
> cdd5d41fd74b at k17g2000yqb.googlegroups.com>, Joaquin Abian wrote:
> 
>> (a==b) and 'YES' or 'NO'
>>
>> Yes, ugly
> 
> Why would you say that?s ugly?
> 
> By the way, you don?t need the parentheses.

But at the same time, if you don't *absolutely know* you don't need the
parentheses then the parentheses are a very good idea, so I applaud the
example as Pythonic while agreeing that it's ugly. A conditional
expression seems more natural.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Tue Mar 30 19:44:53 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 30 Mar 2010 19:44:53 -0400
Subject: psycopg2 / psycopg2.DataError: invalid input syntax for type
	timestamp with time zone:
In-Reply-To: <20100330175056.ca69563c.darcy@druid.net>
References: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>
	<20100330175056.ca69563c.darcy@druid.net>
Message-ID: <hou2dp$1g0$2@dough.gmane.org>

D'Arcy J.M. Cain wrote:
> On Tue, 30 Mar 2010 13:47:42 -0700 (PDT)
> ASh <anton.shishkov at gmail.com> wrote:
>> Hi, please help me understand why am I getting error with this query
>>
>>
>>             new_start_date = "NOW() - '29 days'::INTERVAL"
>>             self.dyndb.orderdb.query('''update xxxx set creation_date
>> = %s
>>             where id_order = %s''', (new_start_date, "123"))
> 
> Put single quotes around the first %s in the query.
> 
And in future please tell us exactly what error you are trying to
explain by quoting the traceback exactly.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From alfps at start.no  Tue Mar 30 19:45:35 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Wed, 31 Mar 2010 01:45:35 +0200
Subject: sort array, apply rearrangement to second
In-Reply-To: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
References: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
Message-ID: <hou2fn$4ds$1@news.eternal-september.org>

* Victor Eijkhout:
> I have two arrays, made with numpy. The first one has values that I want
> to use as sorting keys; the second one needs to be sorted by those keys.
> Obviously I could turn them into a dictionary  of pairs and sort by the
> first member, but I think that's not very efficient, at least in space,
> and this needs to be done as efficiently as possible.
> 
> I could use a hand.

Just do the pairing, but in a 'list', not a dictionary (a dictionary is 
unordered and can't be sorted). You need to keep track of which keys belong to 
which values anyway. And anything in Python is a reference: you're not copying 
the data by creating the pairs. That is, the space overhead is proportional to 
the number of items but is independent of the data size of each item.


Cheers & hth.,

- Alf


From steve at holdenweb.com  Tue Mar 30 19:52:25 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 30 Mar 2010 19:52:25 -0400
Subject: Sometimes the python shell cannot recognize the presence of an
	attribute.
In-Reply-To: <4BB281E1.2030101@rice.edu>
References: <4BB2802A.7050500@rice.edu> <4BB281E1.2030101@rice.edu>
Message-ID: <hou2rt$3gj$1@dough.gmane.org>

Justin Park wrote:
> Sorry, my mistake.
> 
> The real problem is this.
> When I started working on the package, somehow all of indentations were
> made by space-bars instead of using tabs.
> But when I am implementing my own on top of it, I still use tabs to make
> indentations.
> 
> This is causing a problem.
> I have to either conform to their style and change all my tabs to the
> space-bars making up those spaces,
> or change all indentations in the previous implementations by tabs.
> But both the previous implementations and what I am going to do are also
> so large that either way is not going to be efficient.
> 
> What can I do in order to resolve this issue?
> 
You might try Googling for "expandtabs". This isn't a new problem,
though I agree it can be very vexing when it's new to you ;-)

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From steve at holdenweb.com  Tue Mar 30 19:56:25 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 30 Mar 2010 19:56:25 -0400
Subject: sort array, apply rearrangement to second
In-Reply-To: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
References: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
Message-ID: <hou33e$4io$1@dough.gmane.org>

Victor Eijkhout wrote:
> I have two arrays, made with numpy. The first one has values that I want
> to use as sorting keys; the second one needs to be sorted by those keys.
> Obviously I could turn them into a dictionary  of pairs and sort by the
> first member, but I think that's not very efficient, at least in space,
> and this needs to be done as efficiently as possible.
> 
> I could use a hand.
> 
Well, my first approach would be to do it as inefficiently as I can ( or
at least no more efficiently than I can with a simple-minded approach)
and then take it from there.

If I believe this is not a premature optimization (a question about
which I am currently skeptical) I'd suggest conversion to a list of
pairs rather than a dict.

Can you use zip() on numpy arrays? That would be the easiest way to
create the list of pairs.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From darcy at druid.net  Tue Mar 30 20:10:34 2010
From: darcy at druid.net (D'Arcy J.M. Cain)
Date: Tue, 30 Mar 2010 20:10:34 -0400
Subject: psycopg2 / psycopg2.DataError: invalid input syntax for type 
	timestamp with time zone:
In-Reply-To: <e9994806-5a52-4b9a-a4fe-66cf6625e3c9@l25g2000yqd.googlegroups.com>
References: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>
	<mailman.1336.1269985882.23598.python-list@python.org>
	<e9994806-5a52-4b9a-a4fe-66cf6625e3c9@l25g2000yqd.googlegroups.com>
Message-ID: <20100330201034.020c3bf6.darcy@druid.net>

On Tue, 30 Mar 2010 15:46:12 -0700 (PDT)
ASh <anton.shishkov at gmail.com> wrote:
> > > ? ? ? ? ? ? new_start_date = "NOW() - '29 days'::INTERVAL"
> > > ? ? ? ? ? ? self.dyndb.orderdb.query('''update xxxx set creation_date
> > > = %s
> > > ? ? ? ? ? ? where id_order = %s''', (new_start_date, "123"))
> >
> > Put single quotes around the first %s in the query.
> 
> Tried like you said, got this error:
> 
> psycopg2.ProgrammingError: syntax error at or near "NOW"
> LINE 1: update orderdb.orders set creation_date = 'E'NOW() - ''29
> da...

Right.  I misread it.  Please show us the exact error that you get with
the original code.

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


From steve at holdenweb.com  Tue Mar 30 20:12:54 2010
From: steve at holdenweb.com (Steve Holden)
Date: Tue, 30 Mar 2010 20:12:54 -0400
Subject: "Usability, the Soul of Python"
In-Reply-To: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>
Message-ID: <hou42b$72d$1@dough.gmane.org>

Jonathan Hayward wrote:
> I've posted "Usability, the Soul of Python: An Introduction to the
> Python Programming Language Through the Eyes of Usability", at:
> 
>    http://JonathansCorner.com/python/
> 
> The basic suggestion is that much of what works well in Python has
> something to do with the usability it offers programmers.
> 
> Enjoy.
> 
Now try another one called "Brevity, the Soul of Technical Writing: An
Introduction to Making Yourself Understood Through the Eyes of Readability".

What I managed to read seemed to be making worthwhile points, but I felt
a bit like I was wading through a steaming pile of irrelevant verbiage
that actually made it more difficult to extract the useful nuggets.

Bravo for undertaking this task, but I do feel the treatment needs work
from a good copy editor.

Of course you have to take into account my allergy to folksy metaphors
and meandering discourse. Had I chosen your style I might instead have
written the criticism above as:

"""
I would like to begin my critique of this paper with a feature that many
competent technical writers completely fail to appreciate: why brevity
is desirable in technical writing.

Technical writing is not, of course, the only form of writing that there
is. People have been writing ever since the first caveman decided he
could leave marks on the wall of a cave to indicate that food could be
had in the vicinity. The basic concept of brevity is that you should
not, as a writer, use superfluous words because if you do then the
reader will always be in doubt about which parts of your discourse are
meaningful and which are merely decoration.

...
"""

And so on. As I say, this may be criticism dictated by my personal
taste, but I feel you could condense the presentation considerably to
good effect. Sorry if this offends. It's meant to help.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From python at mrabarnett.plus.com  Tue Mar 30 20:13:16 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 31 Mar 2010 01:13:16 +0100
Subject: sort array, apply rearrangement to second
In-Reply-To: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
References: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
Message-ID: <4BB2939C.2040706@mrabarnett.plus.com>

Victor Eijkhout wrote:
> I have two arrays, made with numpy. The first one has values that I want
> to use as sorting keys; the second one needs to be sorted by those keys.
> Obviously I could turn them into a dictionary  of pairs and sort by the
> first member, but I think that's not very efficient, at least in space,
> and this needs to be done as efficiently as possible.
> 
> I could use a hand.
> 
You could sort a list of the indices, using the first array to provide
the keys.


From hidura at gmail.com  Tue Mar 30 20:47:47 2010
From: hidura at gmail.com (hidura at gmail.com)
Date: Wed, 31 Mar 2010 00:47:47 +0000
Subject: Fetch files from mail in python
In-Reply-To: <50697b2c1003301639l4fa75583mc4b290b4c83664cf@mail.gmail.com>
Message-ID: <0016e68ded464e17c304830e18f9@google.com>

I did that but i want to know if i have a file inside the mail how could i  
download that file from my mail.

On Mar 30, 2010 7:39pm, Chris Rebert <clp2 at rebertia.com> wrote:
> On Tue, Mar 30, 2010 at 4:33 PM, hidura at gmail.com> wrote:

> > Hello list, i want to know how could i fetch a file from an email, what  
> kind

> > of library i have to use for that, actually i am working in the support  
> of

> > IMAP and POP3.



> Next time, consult the Global Module Index

> (http://docs.python.org/modindex.html) before posting.



> IMAP: http://docs.python.org/library/imaplib.html

> POP: http://docs.python.org/library/poplib.html



> Cheers,

> Chris

> --

> http://blog.rebertia.com

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From clp2 at rebertia.com  Tue Mar 30 20:56:27 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Tue, 30 Mar 2010 17:56:27 -0700
Subject: Fetch files from mail in python
In-Reply-To: <0016e68ded464e17c304830e18f9@google.com>
References: <50697b2c1003301639l4fa75583mc4b290b4c83664cf@mail.gmail.com>
	<0016e68ded464e17c304830e18f9@google.com>
Message-ID: <50697b2c1003301756u3c169616o3dc2a7bebbe70219@mail.gmail.com>

> On Mar 30, 2010 7:39pm, Chris Rebert <clp2 at rebertia.com> wrote:
>> On Tue, Mar 30, 2010 at 4:33 PM, ?hidura at gmail.com> wrote:
>> > Hello list, i want to know how could i fetch a file from an email, what
>> > kind
>> > of library i have to use for that, actually i am working in the support
>> > of
>> > IMAP and POP3.
>>
>> IMAP: http://docs.python.org/library/imaplib.html
>> POP: http://docs.python.org/library/poplib.html

On Tue, Mar 30, 2010 at 5:47 PM,  <hidura at gmail.com> wrote:
> I did that but i want to know if i have a file inside the mail how could i
> download that file from my mail.

I believe you'd use the email.parser module:
http://docs.python.org/library/email.parser.html

Cheers,
Chris


From cs at zip.com.au  Tue Mar 30 21:04:43 2010
From: cs at zip.com.au (Cameron Simpson)
Date: Wed, 31 Mar 2010 12:04:43 +1100
Subject: "Usability, the Soul of Python"
In-Reply-To: <7f014ea61003300725yf3dfcbdw2976160ca37f60f3@mail.gmail.com>
References: <7f014ea61003300725yf3dfcbdw2976160ca37f60f3@mail.gmail.com>
Message-ID: <20100331010443.GA12592@cskk.homeip.net>

On 30Mar2010 10:25, Chris Colbert <sccolbert at gmail.com> wrote:
| not really, the int will eventually overflow and cycle around ;)
| 
| On Tue, Mar 30, 2010 at 8:11 AM, Xavier Ho <contact at xavierho.com> wrote:
| 
| > Did no one notice that
| > for(i = 99; i > 0; ++i)
| > Gives you an infinite loop (sort of) because i starts a 99, and increases
| > every loop?

And here we see the strength of the Usability example; in Python it
won't overflow, rather seguing seamlessly into an increasing expensive
arbitrary sized int. Though most machines will eventually run out of
memory to hold it...
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

Surely it was of this place, now Cambridge but formerly known by the name of
Babylon, that the prophet spoke when he said, 'the wild beasts of the desert
shall dwell there, and their houses shall be full of doleful creatures, and
owls shall build there, and satyrs shall dance there.'
        - Thomas Gray (1716-1771)


From john at castleamber.com  Tue Mar 30 21:22:42 2010
From: john at castleamber.com (John Bokma)
Date: Tue, 30 Mar 2010 19:22:42 -0600
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
	<mailman.1326.1269971785.23598.python-list@python.org>
	<20100330201609.6ef12ee1@vulcan.local>
	<87sk7h8vns.fsf@castleamber.com>
	<20100330221600.42cd3536@vulcan.local>
Message-ID: <87hbnxz3ml.fsf@castleamber.com>

Robert Fendt <no.spam at local.local> writes:

> And thus spake John Bokma <john at castleamber.com>
> Tue, 30 Mar 2010 13:19:19 -0600:
>
>> And
>> 
>>  a == b and 'Yes' or 'No' 
>> 
>> isn't a Perl-ism?
>
> I never said that this would be better.

It was not my intention to imply you did. But yet I do see books on
Python mention the and or usage, and personally I think the ... if
... else is preferable.

> point of what the advantage is supposed to be of inverting the
> order of the return statement and the conditional check what
> should actually _be_ returned. What's wrong with just writing
>
> if a==b:
>   return 'Yes'
> else:
>   return 'No'

To me the else is adding unneeded noise, I would just write:

if a==b:
    return 'Yes'

return 'No'

> apart from it being a few more line breaks and an additional
> return statement? The inverted form is not more readable per
> se (in fact, quite the opposite), and I would even suggest to
> minimise its use even in languages like C++ and Java. The Python
> syntax is even worse since it not only inverts the order of
> return statement and conditional check, but it also puts the
> conditional between the two results.

I use(d) the if ... else as follows (per Programming in Python 3):

list = [] if list is None else list

in Perl I would've written:

defined $list or $list = [];

Which I prefer over:

$list = [] unless defined $list;

and more over:

$list = [] if not defined $list;

To me the first Perl form reads as a pre-condition: the list must be
defined *or* make it so.

And maybe you're right, the Python one could've been written:

if list is None:
   list = []

which looks, now, also more readable to me as well.

>> Sheesh, this group would be so much nicer without the constant dragging
>> in of Perl to make a point. On top of that, do {  } unless blocks are
>> not idomatic in Perl. Perl Best Practices even clearly states to *never*
>> use unless.
>
> Sorry, but you have just underlined my point, in fact. If it's
> discouraged by experts, then of course the question must be
> valid why such a feature even exists (okay, apart from 'it
> seemed like a good idea at the time').

I guess the latter. Perl has quite some things that in retrospect
could've been done better. On the other hand, Perl developers are very
fanatic about backwards compatibility, which makes it hard to remove
stuff like unless.

On top of that Perl can't be statically analyzed, meaning you can't just
write a perl4to5 or perl510to512 converter.

> And more importantly (and
> more on-topic here), why we have to have an analogon in Python.

My point. You can sufficiently argue what's wrong with if..else in
Python 3 without dragging Perl into it and staying in Python context. I
am both a Perl and (learning) Python programmer, and to be honest I get
very tired of the somewhat weekly

omg Perl suxxxorsss!!11111 

Each language has its own suckage. There are several reasons why while I
am learning Python I also keep updating my Perl skills ;-).

-- 
John Bokma                                                               j3b

Hacking & Hiking in Mexico -  http://johnbokma.com/
http://castleamber.com/ - Perl & Python Development


From sccolbert at gmail.com  Tue Mar 30 21:59:32 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Tue, 30 Mar 2010 21:59:32 -0400
Subject: sort array, apply rearrangement to second
In-Reply-To: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
References: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
Message-ID: <q2t7f014ea61003301859p429db982o769b7804bd739b4d@mail.gmail.com>

On Tue, Mar 30, 2010 at 7:25 PM, Victor Eijkhout <see at sig.for.address>wrote:

> I have two arrays, made with numpy. The first one has values that I want
> to use as sorting keys; the second one needs to be sorted by those keys.
> Obviously I could turn them into a dictionary  of pairs and sort by the
> first member, but I think that's not very efficient, at least in space,
> and this needs to be done as efficiently as possible.
>
> I could use a hand.
>
> Victor.
> --
> Victor Eijkhout -- eijkhout at tacc utexas edu
> --
> http://mail.python.org/mailman/listinfo/python-list
>


I'm not quite sure what you are asking, but there is probably an efficient
way to do it in pure numpy. You can either post an example of what you want
here, or better, take it to the NumPy mailing list and I will help you
there.
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From sccolbert at gmail.com  Tue Mar 30 22:11:41 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Tue, 30 Mar 2010 22:11:41 -0400
Subject: sort array, apply rearrangement to second
In-Reply-To: <q2t7f014ea61003301859p429db982o769b7804bd739b4d@mail.gmail.com>
References: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
	<q2t7f014ea61003301859p429db982o769b7804bd739b4d@mail.gmail.com>
Message-ID: <j2w7f014ea61003301911scb40ef3bs48c58836fcd3e376@mail.gmail.com>

On Tue, Mar 30, 2010 at 9:59 PM, Chris Colbert <sccolbert at gmail.com> wrote:

>
>
> On Tue, Mar 30, 2010 at 7:25 PM, Victor Eijkhout <see at sig.for.address>wrote:
>
>> I have two arrays, made with numpy. The first one has values that I want
>> to use as sorting keys; the second one needs to be sorted by those keys.
>> Obviously I could turn them into a dictionary  of pairs and sort by the
>> first member, but I think that's not very efficient, at least in space,
>> and this needs to be done as efficiently as possible.
>>
>> I could use a hand.
>>
>> Victor.
>> --
>> Victor Eijkhout -- eijkhout at tacc utexas edu
>> --
>> http://mail.python.org/mailman/listinfo/python-list
>>
>
>
> I'm not quite sure what you are asking, but there is probably an efficient
> way to do it in pure numpy. You can either post an example of what you want
> here, or better, take it to the NumPy mailing list and I will help you
> there.
>
>
This seems to be what you want:

http://stackoverflow.com/questions/1903462/how-can-i-zip-sort-parallel-numpy-arrays
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From russ.paielli at gmail.com  Tue Mar 30 22:18:50 2010
From: russ.paielli at gmail.com (Russ P.)
Date: Tue, 30 Mar 2010 19:18:50 -0700 (PDT)
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
Message-ID: <60a3bde8-c503-4d14-89f0-a68f683afd32@x3g2000yqd.googlegroups.com>

On Mar 30, 10:08?am, John Nagle <na... at animats.com> wrote:
> Chris Rebert wrote:
> > On Tue, Mar 30, 2010 at 8:40 AM, gentlestone <tibor.b... at hotmail.com> wrote:
> >> Hi, how can I write the popular C/JAVA syntax in Python?
>
> >> Java example:
> >> ? ?return (a==b) ? 'Yes' : 'No'
>
> >> My first idea is:
> >> ? ?return ('No','Yes')[bool(a==b)]
>
> >> Is there a more elegant/common python expression for this?
>
> > Yes, Python has ternary operator-like syntax:
> > return ('Yes' if a==b else 'No')
>
> > Note that this requires a recent version of Python.
>
> ? ? ?Who let the dogs in? ?That's awful syntax.
>
> ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? John Nagle

Baloney. The Python ternary syntax is perfectly fine. The "if" could
have been put in front, as in Scala:

return if a == b "yes" else "no"

but either way is fine and perfectly readable as far as I am concerned.


From python.list at tim.thechases.com  Tue Mar 30 22:25:13 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Tue, 30 Mar 2010 21:25:13 -0500
Subject: (a==b) ? 'Yes' : 'No'
In-Reply-To: <87hbnxz3ml.fsf@castleamber.com>
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>	<mailman.1317.1269964918.23598.python-list@python.org>	<4bb22b39$0$1638$742ec2ed@news.sonic.net>	<mailman.1326.1269971785.23598.python-list@python.org>	<20100330201609.6ef12ee1@vulcan.local>	<87sk7h8vns.fsf@castleamber.com>	<20100330221600.42cd3536@vulcan.local>
	<87hbnxz3ml.fsf@castleamber.com>
Message-ID: <4BB2B289.9050301@tim.thechases.com>

John Bokma wrote:

> And maybe you're right, the Python one could've been written:
> 
> if list is None:
>    list = []
> 
> which looks, now, also more readable to me as well.

Though there's a slight difference[1], I'd usually use

   lst = lst or []

for your particular initialization use case.

-tkc

[1]
Difference being

   >>> lst = []
   >>> other = lst
   >>> if lst is None: # your code
   ...     lst = []
   ...
   >>> other.append(42)
   >>> lst, other
   ([42], [42])

   >>> lst = []
   >>> other = lst
   >>> lst = lst or [] # my proposal
   >>> other.append(42)
   >>> lst, other
   ([], [42])



From robert.kern at gmail.com  Tue Mar 30 23:00:38 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Tue, 30 Mar 2010 22:00:38 -0500
Subject: sort array, apply rearrangement to second
In-Reply-To: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
References: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
Message-ID: <houdtl$v0p$1@dough.gmane.org>

On 2010-03-30 18:25 , Victor Eijkhout wrote:
> I have two arrays, made with numpy. The first one has values that I want
> to use as sorting keys; the second one needs to be sorted by those keys.
> Obviously I could turn them into a dictionary  of pairs and sort by the
> first member, but I think that's not very efficient, at least in space,
> and this needs to be done as efficiently as possible.

second[first.argsort()]

Ask numpy questions on the numpy mailing list.

   http://www.scipy.org/Mailing_Lists

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From keeloh at rocketmail.com  Tue Mar 30 23:39:53 2010
From: keeloh at rocketmail.com (POOJA)
Date: Tue, 30 Mar 2010 20:39:53 -0700 (PDT)
Subject: Consolidate Credit Card Debt
Message-ID: <5270502a-1fc4-41cf-8427-30c5dee865fd@k5g2000prg.googlegroups.com>

Consolidate Credit Card Debt
------------------------------

http://sites.google.com/site/creditcarddebtconsolidation33


From gagsl-py2 at yahoo.com.ar  Wed Mar 31 02:22:54 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 31 Mar 2010 03:22:54 -0300
Subject: xpat error in xmlrp client. How to inspect data.
References: <4bab1f4a$0$25677$426a74cc@news.free.fr>
	<mailman.1297.1269923825.23598.python-list@python.org>
	<4bb266b5$0$21786$426a74cc@news.free.fr>
Message-ID: <op.vae5cgbwx6zn5v@lepton.softlabbsas.com.ar>

En Tue, 30 Mar 2010 18:01:40 -0300, News123 <news1234 at free.fr> escribi?:
> Gabriel Genellina wrote:
>> En Thu, 25 Mar 2010 05:31:05 -0300, News123 <news1234 at free.fr> escribi?:
>>
>>> I'm havign a small xmlrpc client, which works normally fine.
>>> (xmlrpc via https)
>>>
>>> Sometimes however I receive an Exception about an expat error.
>>>
>>>
>>> The output, that I receive is:
>>>   File "C:\mycode\myrpcclient.py", line 63, in upload_chunk
>>>     rslt = myrpcclient.call()
>>>   File "C:\Python26\lib\xmlrpclib.py", line 1199, in __call__
>>>     return self.__send(self.__name, args)
>>>   File "C:\Python26\lib\xmlrpclib.py", line 1489, in __request
>>>     verbose=self.__verbose
>>>   File "C:\Python26\lib\xmlrpclib.py", line 1253, in request
>>>     return self._parse_response(h.getfile(), sock)
>>>   File "C:\Python26\lib\xmlrpclib.py", line 1387, in _parse_response
>>>     p.feed(response)
>>>   File "C:\Python26\lib\xmlrpclib.py", line 601, in feed
>>>     self._parser.Parse(data, 0)
>>> ExpatError: syntax error: line 1, column 0
>>>
>>
>> a) Use the standard cgitb module (despite its name, it is useful outside
>> CGI scripts)
>>
>> b) Use the tb module available from http://pypi.python.org/pypi/tb
>>
> I'm currently using the default module traceback and code, which looks
> roughly like:
>
> try:
>   xmlrpccall()
> except Exception as e:
>   ex_type,ex_value,e_b = sys.exc_info()
>   tbstring = traceback.format_exc()
>   logging.error('%s:%s:%s' % (ex_type,ex_value,tbstring)
>
>
> do cgitb or tb really provide much more info?

Well, for each frame along the stack, cgitb shows the value of all  
function arguments, the value of each name referenced, and a few more  
lines of code around the current one. It's rather verbose, but doesn't  
include all local variables.

The tb module shows -also for each frame along the stack- the value of all  
its local names (but doesn't include any global one).

Just try both of them and see which one you like most.

>> d) In your exception handler, walk the traceback object until you reach
>> the feed() call, and inspect the corresponding tb_frame.f_locals
>> dictionary.
>
> How can I walk a traceback? For the current problem the the monkeypatch
> should be good enough, but for other cases it might be good to know.

Each traceback object is linked to the next one via its tb_next attribute.  
But inspect.trace() builds a list of traceback records that may be easier  
to handle; see the inspect module documentation. You can identify the  
desired frame with its filename and function name, and then access its  
local variables with f_locals.
I did something like that to gather context information for errors  
happening in a third party library that were hard to diagnose otherwise.

-- 
Gabriel Genellina



From frank at chagford.com  Wed Mar 31 02:49:04 2010
From: frank at chagford.com (Frank Millman)
Date: Wed, 31 Mar 2010 08:49:04 +0200
Subject: Sublassing tuple works, subclassing list does not
Message-ID: <hour90$vlc$1@dough.gmane.org>

Hi all

I needed something similar to, but not quite the same as, 
collections.namedtuple.

The differences are that namedtuple requires the 'names' to be provided at 
creation time, and then lends itself to creating multiple instances of 
itself. I wanted a more generic class where I could supply the 'names' and 
'values' at instantiation time.

I came up with a simple solution that seems to work -

>>> class MyTuple(tuple):
...   def __new__(cls, names, values):
...     for name, value in zip(names, values):
...       setattr(cls, name, value)
...     return tuple.__new__(cls, values)
...
>>> names = ['A', 'B', 'C']
>>> values = ['a', 'b', 'c']
>>>
>>> tup = MyTuple(names, values)
>>>
>>> print tup
('a', 'b', 'c')
>>>
>>> print tup[0]
a
>>>
>>> print tup.B
b
>>>

Then I had a need to add elements after the tuple had been created. As 
tuples are immutable, I thought it would be easy to change it to a list. 
However, it does not work -

>>> class MyList(list):
...   def __new__(cls, names, values):
...     for name, value in zip(names, values):
...       setattr(cls, name, value)
...     return list.__new__(cls, values)
...
>>> names = ['A', 'B', 'C']
>>> values = ['a', 'b', 'c']
>>>
>>> lst = MyList(names, values)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: list() takes at most 1 argument (2 given)
>>>

I can find a workaround, but I would be interested to know the reason why it 
does not work.

Version is 2.6.2.

Thanks

Frank Millman




From affdfsdfdsfsd at b.com  Wed Mar 31 03:47:32 2010
From: affdfsdfdsfsd at b.com (Tracubik)
Date: 31 Mar 2010 07:47:32 GMT
Subject: Python + OpenOffice Calc
Message-ID: <4bb2fe14$0$1120$4fafbaef@reader3.news.tin.it>

Hi all!
i'm giving away to a friend of mine that have a garage (he repair car) my 
old computer. He will use it essentialy to create estimates of the work 
via an ods file (i've made a simple ods file to be filled with the cost of 
materials and a description of the work).
He's totally new with computer and have difficult to fill the ods file, so 
i'ld like to create a simple python program that help him to introduce the 
data in to the ods file via a simple gui.
So what i'm looking for is a way in python to insert data in a particular 
cell of the ods file and possibly to save it and print it when it's full 
filled with data.

the guy is similar to this:

3 fields: quantity - description of the piece bought - price

a way to add a new "line" if needed (for a new piece entry) similar to the 
"add rule" in evolution

1 text field for the description of the work + 1 field for the price of 
the work

and off course a way to insert this data in to the ods file via python

Any hints/tutorial/info?

thanks
Nico


From __peter__ at web.de  Wed Mar 31 03:52:09 2010
From: __peter__ at web.de (Peter Otten)
Date: Wed, 31 Mar 2010 09:52:09 +0200
Subject: logging: local functions ==> loss of lineno
References: <mailman.576.1268256192.23598.python-list@python.org>
	<hnaj9c$i0u$02$1@news.t-online.com>
	<4BA295A1.70207@hellmutweber.de>
	<mailman.972.1268995215.23598.python-list@python.org>
	<hnvqe5$vc$02$1@news.t-online.com>
	<mailman.977.1269006574.23598.python-list@python.org>
	<ho21dt$b6v$00$1@news.t-online.com>
	<d35c950b-c6e5-4162-8175-3e0a0255c71a@30g2000yqi.googlegroups.com>
	<hocmak$ap$00$1@news.t-online.com>
	<b02720d8-a1b5-4133-a018-b3dd613be8e3@q21g2000yqm.googlegroups.com>
	<mailman.1335.1269985774.23598.python-list@python.org>
Message-ID: <houuto$ed9$02$1@news.t-online.com>

Hellmut Weber wrote:

> Hi Peter and Jean-Michel,
> thanks for all your hints and pieces of code.
> 
> It took me a while to play around with what I got from you (and some
> study of Vinay's module documentation.
> 
> Now I have come up with a more complete solution I'm quite satisfied
> with. And I would be very glad to receive your comments on my code
> indicating what I could do better, given that I'm still at the very
> beginning with python.

> Here is my module and a corresponding test program:

> # --- color change strings for terminal output ---
> #
> pc_yell = '\033[01;93m'
> pc_purp = '\033[01;33m'
> pc_gren = '\033[01;92m'

Hw lng wld psts + prgrms b wr it nt 4 z art of clvr + ez 2 mmrz 
abbreviations ;)

> # --- Class for all logging functionality ---
> #
> class locLogg():
>    _logger = None
> 

>    def debug_log(self, msg, *args, **kwargs):
>    def warn_log(self, msg, *args, **kwargs):
>    def error_log(self, msg, *args, **kwargs):

It should be easy to factor out most the code in your xxx_log() methods into 
a common helper. 

>    def fatal_log(self, msg, *args, **kwargs):
>      previousFrame = inspect.currentframe().f_back
>      locLogg._logger.fatal(str(level_color['fatal'])+msg+pc_norm + \
>        ' ' + argskw_2_string(*args, **kwargs),
>        extra={'custom_lineno':previousFrame.f_lineno,
>          'custom_filename': previousFrame.f_code.co_filename })

I think the formatting belongs into another layer. That's the purpose of the 
logging.Formatter class. You could enhance it along those lines:

class Formatter(logging.Formatter):
    markers = {
        logging.INFO: ("<info>", "</info>"),
        logging.WARN: ("<warn>", "</warn>"),
        }
    def format(self, record):
        message = logging.Formatter.format(self, record)
        try:
            prefix, suffix = self.markers[record.levelno]
        except KeyError:
            pass
        else:
            message = prefix + message + suffix
        return message

My general impression is that you are fighting the logging library's 
structure rather than trying to use it as effectively as possible.

>    foo.info_log('another bar info', 1,2,3, a=11, b=22, c=44)

You could achieve something similar with a standard logger by passing your 
extra information through the extra parameter, e. g:

def extra(*args, **kw):
   return dict(argskw=(args, kw))
foo.info("another...", extra=extra(1, 2, 3, a=11, b=22))

Peter


From kse.listed.co1 at gmail.com  Wed Mar 31 03:56:41 2010
From: kse.listed.co1 at gmail.com (Naeem)
Date: Wed, 31 Mar 2010 00:56:41 -0700 (PDT)
Subject: "Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL 
	JOBS IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT" 
	"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
Message-ID: <1c64f0d6-e34a-4997-b919-ba9b49b5e466@y11g2000prf.googlegroups.com>

"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
"Jobs in Kuwait" "Kuwait jobs" "accounts jobs in kuwait" "MEDICAL JOBS
IN KUWAIT" "FINANCE JOBS IN KUWAIT" "ENGINEERING JOBS IN KUWAIT"
"ADVERTISED JOBS ION KUWAIT" ON http://jobsinkuwait-net.blogspot.com/
VV


From __peter__ at web.de  Wed Mar 31 03:57:51 2010
From: __peter__ at web.de (Peter Otten)
Date: Wed, 31 Mar 2010 09:57:51 +0200
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
	<mailman.1326.1269971785.23598.python-list@python.org>
	<20100330201609.6ef12ee1@vulcan.local>
	<87sk7h8vns.fsf@castleamber.com>
	<5ef544bb-95a0-4329-80ef-f679d62b8ead@z11g2000yqz.googlegroups.com>
Message-ID: <houv8a$ed9$02$2@news.t-online.com>

Pierre Quentel wrote:

> I'm surprised nobody proposed a solution with itertools ;-)

next(itertools.takewhile(lambda _: a == b, ["yes"]), "no")

You spoke to soon :)

Peter


From clp2 at rebertia.com  Wed Mar 31 03:58:46 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 31 Mar 2010 00:58:46 -0700
Subject: Python + OpenOffice Calc
In-Reply-To: <4bb2fe14$0$1120$4fafbaef@reader3.news.tin.it>
References: <4bb2fe14$0$1120$4fafbaef@reader3.news.tin.it>
Message-ID: <j2v50697b2c1003310058m7588ea54k14ca4718bb7f3b7@mail.gmail.com>

On Wed, Mar 31, 2010 at 12:47 AM, Tracubik <affdfsdfdsfsd at b.com> wrote:
> Hi all!
> i'm giving away to a friend of mine that have a garage (he repair car) my
> old computer. He will use it essentialy to create estimates of the work
> via an ods file (i've made a simple ods file to be filled with the cost of
> materials and a description of the work).
> He's totally new with computer and have difficult to fill the ods file, so
> i'ld like to create a simple python program that help him to introduce the
> data in to the ods file via a simple gui.
> So what i'm looking for is a way in python to insert data in a particular
> cell of the ods file and possibly to save it and print it when it's full
> filled with data.
>
> the guy is similar to this:
>
> 3 fields: quantity - description of the piece bought - price
>
> a way to add a new "line" if needed (for a new piece entry) similar to the
> "add rule" in evolution
>
> 1 text field for the description of the work + 1 field for the price of
> the work
>
> and off course a way to insert this data in to the ods file via python
>
> Any hints/tutorial/info?

PyUNO: http://wiki.services.openoffice.org/wiki/PyUNO_bridge

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


From v.harishankar at gmail.com  Wed Mar 31 04:16:58 2010
From: v.harishankar at gmail.com (Harishankar)
Date: Wed, 31 Mar 2010 08:16:58 +0000 (UTC)
Subject: No editbox () functionality in python-dialog module?
Message-ID: <hov0dq$5u2$1@news.telesweet.net>

Strange issue, I find that the dialog utility has an editbox function but 
the python-dialog module doesn't provide this and there's no mention of 
the reason for the omission of this important functionality.

Is there no easy and simple way to create a multi-line input dialog in 
ANY of the text mode console libraries? :-(





-- 
Harishankar (http://harishankar.org http://literaryforums.org)


From lbolla at gmail.com  Wed Mar 31 04:18:39 2010
From: lbolla at gmail.com (lbolla)
Date: Wed, 31 Mar 2010 01:18:39 -0700 (PDT)
Subject: Sublassing tuple works, subclassing list does not
References: <mailman.1360.1270018159.23598.python-list@python.org>
Message-ID: <f8011c0b-0b1b-4a4f-94ff-304c16ef9a5b@q16g2000yqq.googlegroups.com>

On Mar 31, 7:49?am, "Frank Millman" <fr... at chagford.com> wrote:
> Hi all
>
> I needed something similar to, but not quite the same as,
> collections.namedtuple.
>
> The differences are that namedtuple requires the 'names' to be provided at
> creation time, and then lends itself to creating multiple instances of
> itself. I wanted a more generic class where I could supply the 'names' and
> 'values' at instantiation time.
>
> I came up with a simple solution that seems to work -
>
> >>> class MyTuple(tuple):
>
> ... ? def __new__(cls, names, values):
> ... ? ? for name, value in zip(names, values):
> ... ? ? ? setattr(cls, name, value)
> ... ? ? return tuple.__new__(cls, values)
> ...
>
> >>> names = ['A', 'B', 'C']
> >>> values = ['a', 'b', 'c']
>
> >>> tup = MyTuple(names, values)
>
> >>> print tup
> ('a', 'b', 'c')
>
> >>> print tup[0]
> a
>
> >>> print tup.B
> b
>
> Then I had a need to add elements after the tuple had been created. As
> tuples are immutable, I thought it would be easy to change it to a list.
> However, it does not work -
>
> >>> class MyList(list):
>
> ... ? def __new__(cls, names, values):
> ... ? ? for name, value in zip(names, values):
> ... ? ? ? setattr(cls, name, value)
> ... ? ? return list.__new__(cls, values)
> ...>>> names = ['A', 'B', 'C']
> >>> values = ['a', 'b', 'c']
>
> >>> lst = MyList(names, values)
>
> Traceback (most recent call last):
> ? File "<stdin>", line 1, in <module>
> TypeError: list() takes at most 1 argument (2 given)
>
>
>
> I can find a workaround, but I would be interested to know the reason why it
> does not work.
>
> Version is 2.6.2.
>
> Thanks
>
> Frank Millman

When subclassing immutable types, you need to override __new__;
otherwise you need to override __init__.
Here is an in-depth explanation: http://www.python.org/download/releases/2.2/descrintro/#metaclasses

Here is some code:

class MyTuple(tuple):
	def __new__(cls, names, values):
		for name, value in zip(names, values):
			setattr(cls, name, value)
		return tuple.__new__(cls, values)

class MyList(list):
	def __init__(self, names, values):
		list.__init__(self, values)
		for name, value in zip(names, values):
			setattr(self, name, value)

names = ['A', 'B', 'C']
values = ['a', 'b', 'c']

tup = MyTuple(names, values)
print tup
print tup[0]
print tup.B

lst = MyList(names, values)
print lst
print lst[0]
print lst.B


L.


From frank at chagford.com  Wed Mar 31 04:29:17 2010
From: frank at chagford.com (Frank Millman)
Date: Wed, 31 Mar 2010 10:29:17 +0200
Subject: Sublassing tuple works, subclassing list does not
References: <mailman.1360.1270018159.23598.python-list@python.org>
	<f8011c0b-0b1b-4a4f-94ff-304c16ef9a5b@q16g2000yqq.googlegroups.com>
Message-ID: <hov14t$irf$1@dough.gmane.org>


"lbolla" <lbolla at gmail.com> wrote in message 
news:f8011c0b-0b1b-4a4f-94ff-304c16ef9a5b at q16g2000yqq.googlegroups.com...
On Mar 31, 7:49 am, "Frank Millman" <fr... at chagford.com> wrote:
>> Hi all
>>

> When subclassing immutable types, you need to override __new__;
> otherwise you need to override __init__.

Perfect. Thanks very much.

Frank




From michael.ricordeau at gmail.com  Wed Mar 31 04:29:43 2010
From: michael.ricordeau at gmail.com (Michael Ricordeau)
Date: Wed, 31 Mar 2010 10:29:43 +0200
Subject: psycopg2 / psycopg2.DataError: invalid input syntax for type
	timestamp with time zone:
In-Reply-To: <5171EFC3-09A0-4937-BDAD-C179CF1E1DFE@semanchuk.com>
References: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>
	<5171EFC3-09A0-4937-BDAD-C179CF1E1DFE@semanchuk.com>
Message-ID: <20100331102943.7f542d17@moriz.interne>

Hi

You cannot add 'NOW() - '29 days'::INTERVAL' as a query because cursor.execute() will try to mogrify it.

You can do :
  import datetime
  idays = psycopg2.extensions.adapt(datetime.timedelta(days=29))
  self.dyndb.orderdb.query('update xxxx set creation_date=(NOW() - %s) where id_order=%s', idays, "123"))

Or:
  import datetime
  interval = datetime.datetime.now() - datetime.timedelta(days=29)
  self.dyndb.orderdb.query('update xxxx set creation_date=%s where id_order=%s', (interval, "123"))
  # But in this case current date/time is not evaluated from postgresql server but only from python env ... this may cause some bugs     

You may also try to add an interval type with psycopg2.extensions.INTERVAL (I never played with it)



Le Tue, 30 Mar 2010 17:26:51 -0400,
Philip Semanchuk <philip at semanchuk.com> a ?crit :

> 
> On Mar 30, 2010, at 4:47 PM, ASh wrote:
> 
> > Hi, please help me understand why am I getting error with this query
> >
> >
> >            new_start_date = "NOW() - '29 days'::INTERVAL"
> >            self.dyndb.orderdb.query('''update xxxx set creation_date
> > = %s
> >            where id_order = %s''', (new_start_date, "123"))
> >
> >
> >
> > ...
> > psycopg2.DataError: invalid input syntax for type timestamp with time
> > zone: "NOW() - '29 days'::INTERVAL"
> 
> Hi Anton,
> It sounds to me like the problem is with your SQL rather than with  
> psycopg2 or Python. Try the query directly in Postgres -- does it work  
> there? If so, then your next step should be to ask on the psycopg2  
> mailing list that Google can find for you.
> 
> Good luck
> Philip
> 


From richard.lamboj at bilcom.at  Wed Mar 31 04:36:32 2010
From: richard.lamboj at bilcom.at (Richard Lamboj)
Date: Wed, 31 Mar 2010 10:36:32 +0200
Subject: libpst - python bindings
Message-ID: <201003311036.32554.richard.lamboj@bilcom.at>


Hello,

are there any python bindings for libpst?

http://www.five-ten-sg.com/libpst/
https://alioth.debian.org/projects/libpst/

Kind Regards

Richi


From anton.shishkov at gmail.com  Wed Mar 31 04:42:41 2010
From: anton.shishkov at gmail.com (Anton Shishkov)
Date: Wed, 31 Mar 2010 01:42:41 -0700 (PDT)
Subject: psycopg2 / psycopg2.DataError: invalid input syntax for type 
	timestamp with time zone:
References: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>
	<mailman.1336.1269985882.23598.python-list@python.org>
	<e9994806-5a52-4b9a-a4fe-66cf6625e3c9@l25g2000yqd.googlegroups.com>
	<mailman.1349.1269994259.23598.python-list@python.org>
Message-ID: <f4c24dde-6d96-49a7-a805-036e090249fc@z35g2000yqd.googlegroups.com>

On Mar 31, 3:10?am, "D'Arcy J.M. Cain" <da... at druid.net> wrote:
> On Tue, 30 Mar 2010 15:46:12 -0700 (PDT)
>
> ASh <anton.shish... at gmail.com> wrote:
> > > > ? ? ? ? ? ? new_start_date = "NOW() - '29 days'::INTERVAL"
> > > > ? ? ? ? ? ? self.dyndb.orderdb.query('''update xxxx set creation_date
> > > > = %s
> > > > ? ? ? ? ? ? where id_order = %s''', (new_start_date, "123"))
>
> > > Put single quotes around the first %s in the query.
>
> > Tried like you said, got this error:
>
> > psycopg2.ProgrammingError: syntax error at or near "NOW"
> > LINE 1: update orderdb.orders set creation_date = 'E'NOW() - ''29
> > da...
>
> Right. ?I misread it. ?Please show us the exact error that you get with
> the original code.
>
> --
> D'Arcy J.M. Cain <da... at druid.net> ? ? ? ? | ?Democracy is three wolveshttp://www.druid.net/darcy/? ? ? ? ? ? ? ?| ?and a sheep voting on
> +1 416 425 1212 ? ? (DoD#0082) ? ?(eNTP) ? | ?what's for dinner.

Error:
    cursor.execute(sql, params)
  File "/opt/local/lib/python2.5/site-packages/psycopg2/extras.py",
line 118, in execute
    return _cursor.execute(self, query, vars, async)
psycopg2.ProgrammingError: syntax error at or near "NOW"
LINE 1: update orderdb.orders set creation_date = 'E'NOW() - ''29
da...
                                                     ^


From bruno.42.desthuilliers at websiteburo.invalid  Wed Mar 31 04:58:53 2010
From: bruno.42.desthuilliers at websiteburo.invalid (Bruno Desthuilliers)
Date: Wed, 31 Mar 2010 10:58:53 +0200
Subject: Sublassing tuple works, subclassing list does not
In-Reply-To: <f8011c0b-0b1b-4a4f-94ff-304c16ef9a5b@q16g2000yqq.googlegroups.com>
References: <mailman.1360.1270018159.23598.python-list@python.org>
	<f8011c0b-0b1b-4a4f-94ff-304c16ef9a5b@q16g2000yqq.googlegroups.com>
Message-ID: <4bb30e95$0$17814$426a74cc@news.free.fr>

lbolla a ?crit :
> 
> class MyList(list):
> 	def __init__(self, names, values):
> 		list.__init__(self, values)
> 		for name, value in zip(names, values):
> 			setattr(self, name, value)
> 
> names = ['A', 'B', 'C']
> values = ['a', 'b', 'c']
> 
> lst = MyList(names, values)
> print lst
> print lst[0]
> print lst.B
> 

 >>> lst[0] = "foobar"
 >>> lst.A
'a'>>> lst.B = 42
 >>> lst[1]
'b'
 >>> lst.D="duh"
 >>> lst[3]
Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
IndexError: list index out of range



From rtw at rtw.me.uk  Wed Mar 31 05:02:27 2010
From: rtw at rtw.me.uk (Rob Williscroft)
Date: Wed, 31 Mar 2010 04:02:27 -0500
Subject: Sublassing tuple works, subclassing list does not
References: <mailman.1360.1270018159.23598.python-list@python.org>
Message-ID: <Xns9D4C66A7FA9BrtwfreenetREMOVEcouk@216.196.109.145>

Frank Millman wrote in news:mailman.1360.1270018159.23598.python-
list at python.org in comp.lang.python:

> I came up with a simple solution that seems to work -
> 
>>>> class MyTuple(tuple):
> ...   def __new__(cls, names, values):
> ...     for name, value in zip(names, values):
> ...       setattr(cls, name, value)
> ...     return tuple.__new__(cls, values)
> ...
>>>> names = ['A', 'B', 'C']
>>>> values = ['a', 'b', 'c']
>>>>
>>>> tup = MyTuple(names, values)
>>>>

Are you aware you are adding attributes to the class here, IOW:

    	MyTuple.C == 'c'

If you want to add attibutes to the instance:

class MyTuple(tuple):
  def __new__(cls, names, values):
    r =  tuple.__new__(cls, values)
    for name, value in zip(names, values):
      setattr(r, name, value)
    return r

names = ['A', 'B', 'C']
values = ['a', 'b', 'c']

tup = MyTuple(names, values)

assert tup[0] == 'a'
assert tup.B == 'b'

try:
  MyTuple.C
except AttributeError:
  pass
else:
  assert False





From pavlovevidence at gmail.com  Wed Mar 31 05:38:33 2010
From: pavlovevidence at gmail.com (Carl Banks)
Date: Wed, 31 Mar 2010 02:38:33 -0700 (PDT)
Subject: Sublassing tuple works, subclassing list does not
References: <mailman.1360.1270018159.23598.python-list@python.org> 
	<Xns9D4C66A7FA9BrtwfreenetREMOVEcouk@216.196.109.145>
Message-ID: <2baf58a8-b5f1-4db0-9dff-260c62f1641f@h4g2000pre.googlegroups.com>

On Mar 31, 2:02?am, Rob Williscroft <r... at rtw.me.uk> wrote:
> Frank Millman wrote in news:mailman.1360.1270018159.23598.python-
> l... at python.org in comp.lang.python:
>
> > I came up with a simple solution that seems to work -
>
> >>>> class MyTuple(tuple):
> > ... ? def __new__(cls, names, values):
> > ... ? ? for name, value in zip(names, values):
> > ... ? ? ? setattr(cls, name, value)
> > ... ? ? return tuple.__new__(cls, values)
> > ...
> >>>> names = ['A', 'B', 'C']
> >>>> values = ['a', 'b', 'c']
>
> >>>> tup = MyTuple(names, values)
>
> Are you aware you are adding attributes to the class here, IOW:
>
> ? ? ? ? MyTuple.C == 'c'



> If you want to add attibutes to the instance:
>
> class MyTuple(tuple):
> ? def __new__(cls, names, values):
> ? ? r = ?tuple.__new__(cls, values)
> ? ? for name, value in zip(names, values):
> ? ? ? setattr(r, name, value)
> ? ? return r
>
> names = ['A', 'B', 'C']
> values = ['a', 'b', 'c']
>
> tup = MyTuple(names, values)
>
> assert tup[0] == 'a'
> assert tup.B == 'b'
>
> try:
> ? MyTuple.C
> except AttributeError:
> ? pass
> else:
> ? assert False

Careful, this adds the new attributes as to the object's __dict__, not
to the tuple item slots.  Which works ok if you don't care if that
someone can mutate the attributes, and if they do the attributes no
longer match the items.  Personally I do mind.

tup = MyTuple(names,values)
assert tup.A == 'a'
assert tup[0] == 'a'
tup.A = 'd'    # doesn't fail but should
assert tup.A == 'd'
assert tup[0] == 'd'   # fails but, granted you allow mutabilty,
shouldn't



The best way to do what the OP wanted (originally) is this, no
subclassing necessary:

def my_named_tuple(names,values):
    return namedtuple('ad_hoc_named_tuple',names)(*values)


As for the OP's second problem, to append named items, I'd first
consider whether I'm thinking about the problem correctly, and if so,
go with a subclass of list and overriding __getattr__.  Probably one
of the rare cases I would override __getattr__ other than a proxy
class.


Carl Banks


From mark.dufour at gmail.com  Wed Mar 31 05:50:42 2010
From: mark.dufour at gmail.com (Mark Dufour)
Date: Wed, 31 Mar 2010 11:50:42 +0200
Subject: ANN: Shed Skin 0.4
Message-ID: <g2x8180ef691003310250g2c32722bvf9b21105848afc8a@mail.gmail.com>

Hi all,

I have just released Shed Skin 0.4, an experimental (restricted) Python-to-C++
compiler. Please see my blog for more details about the release:

http://shed-skin.blogspot.com/


Thanks,
Mark Dufour.
-- 
"Overdesigning is a SIN. It's the archetypal example of what I call 'bad
taste'" - Linus Torvalds
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From chris at simplistix.co.uk  Wed Mar 31 06:39:30 2010
From: chris at simplistix.co.uk (Chris Withers)
Date: Wed, 31 Mar 2010 11:39:30 +0100
Subject: PyDispatcher on sourceforge doesn't play nice with easy_install
In-Reply-To: <4BB21F18.2010705@vrplumber.com>
References: <4BB1B034.9020905@simplistix.co.uk>
	<4BB21F18.2010705@vrplumber.com>
Message-ID: <4BB32662.9080702@simplistix.co.uk>

Mike C. Fletcher wrote:
> Chris Withers wrote:
>> Hi All,
>>
>> Using easy_install to get PyDispatcher results in:
>>
> ...
>> Who's the maintainer of PyDispatcher nowadays? Would be handy if they
>> removed the sourceforge link from pypi.
> ...
> 
> Thanks for the report.  I've released a 2.0.2 version on PyPI.  That
> should now work properly with easy_install.

Great! Thanks Mike!

Chris

-- 
Simplistix - Content Management, Batch Processing & Python Consulting
             - http://www.simplistix.co.uk


From iwanttobeabadger at googlemail.com  Wed Mar 31 06:49:14 2010
From: iwanttobeabadger at googlemail.com (Nathan Harmston)
Date: Wed, 31 Mar 2010 11:49:14 +0100
Subject: Generating text from a regular expression
Message-ID: <w2gb32951aa1003310349l8938653fw7cd92b848701c9ac@mail.gmail.com>

Hi everyone,

I have a slightly complicated/medium sized regular expression and I
want to generate all possible words that it can match (to compare
performance of regex against an acora based matcher). Using the
regular expression as a grammar to generate all words in its language.
I was wondering if this possible in Python or possible using anything.
Google doesnt seem to give any obvious answers.

Many thanks in advance,

Nathan


From anton.shishkov at gmail.com  Wed Mar 31 06:50:39 2010
From: anton.shishkov at gmail.com (Anton Shishkov)
Date: Wed, 31 Mar 2010 03:50:39 -0700 (PDT)
Subject: psycopg2 / psycopg2.DataError: invalid input syntax for type 
	timestamp with time zone:
References: <da1cadae-6341-487a-979a-572219658242@x3g2000yqd.googlegroups.com>
	<5171EFC3-09A0-4937-BDAD-C179CF1E1DFE@semanchuk.com>
	<mailman.1367.1270024188.23598.python-list@python.org>
Message-ID: <f1ec217b-90fc-461d-9f52-4b98329c8007@z4g2000yqa.googlegroups.com>

On Mar 31, 11:29?am, Michael Ricordeau <michael.ricord... at gmail.com>
wrote:
> Hi
>
> You cannot add 'NOW() - '29 days'::INTERVAL' as a query because cursor.execute() will try to mogrify it.
>
> You can do :
> ? import datetime
> ? idays = psycopg2.extensions.adapt(datetime.timedelta(days=29))
> ? self.dyndb.orderdb.query('update xxxx set creation_date=(NOW() - %s) where id_order=%s', idays, "123"))
>
> Or:
> ? import datetime
> ? interval = datetime.datetime.now() - datetime.timedelta(days=29)
> ? self.dyndb.orderdb.query('update xxxx set creation_date=%s where id_order=%s', (interval, "123"))
> ? # But in this case current date/time is not evaluated from postgresql server but only from python env ... this may cause some bugs ? ?
>
> You may also try to add an interval type with psycopg2.extensions.INTERVAL (I never played with it)
>
> Le Tue, 30 Mar 2010 17:26:51 -0400,
> Philip Semanchuk <phi... at semanchuk.com> a ?crit :
>
>
>
>
>
> > On Mar 30, 2010, at 4:47 PM, ASh wrote:
>
> > > Hi, please help me understand why am I getting error with this query
>
> > > ? ? ? ? ? ?new_start_date = "NOW() - '29 days'::INTERVAL"
> > > ? ? ? ? ? ?self.dyndb.orderdb.query('''update xxxx set creation_date
> > > = %s
> > > ? ? ? ? ? ?where id_order = %s''', (new_start_date, "123"))
>
> > > ...
> > > psycopg2.DataError: invalid input syntax for type timestamp with time
> > > zone: "NOW() - '29 days'::INTERVAL"
>
> > Hi Anton,
> > It sounds to me like the problem is with your SQL rather than with ?
> > psycopg2 or Python. Try the query directly in Postgres -- does it work ?
> > there? If so, then your next step should be to ask on the psycopg2 ?
> > mailing list that Google can find for you.
>
> > Good luck
> > Philip

thank you for good examples (bow)


From hniksic at xemacs.org  Wed Mar 31 07:07:55 2010
From: hniksic at xemacs.org (Hrvoje Niksic)
Date: Wed, 31 Mar 2010 13:07:55 +0200
Subject: Sublassing tuple works, subclassing list does not
References: <mailman.1360.1270018159.23598.python-list@python.org>
Message-ID: <87iq8czr3o.fsf@busola.homelinux.net>

"Frank Millman" <frank at chagford.com> writes:

>>>> class MyList(list):
> ...   def __new__(cls, names, values):
> ...     for name, value in zip(names, values):
> ...       setattr(cls, name, value)
> ...     return list.__new__(cls, values)

Did you really mean to setattr the class here?  If I'm guessing
your intentions correctly, it should be:

        def __new__(cls, names, values):
          self = list.__new__(cls, values)
          for name, value in zip(names, values):
            setattr(self, name, value)
          return self

> Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
> TypeError: list() takes at most 1 argument (2 given)
>>>>
>
> I can find a workaround, but I would be interested to know the reason
> why it does not work.

Because you didn't define __init__, so MyList inherited the one from
list, and it has a different signature to what you're calling it with.
Simply add an __init__ with the proper signature, and the proper upcall
to list.__init__:

   def __init__(self, names, values):
       list.__init__(self, values)

But if you're doing that, you don't need __new__ at all.  Simply
override __init__ and place your setattr loop there:

>>> class MyList(list):
...    def __init__(self, names, values):
...      for name, value in zip(names, values):
...        setattr(self, name, value)
...      list.__init__(self, values)
...
>>> MyList(['a'], [1])
[1]
>>> _.a
1


From frank at chagford.com  Wed Mar 31 07:51:05 2010
From: frank at chagford.com (Frank Millman)
Date: Wed, 31 Mar 2010 13:51:05 +0200
Subject: Sublassing tuple works, subclassing list does not
References: <hour90$vlc$1@dough.gmane.org>
Message-ID: <hovcva$t3a$1@dough.gmane.org>

On Mar 31, 8:49 am, "Frank Millman" <fr... at chagford.com> wrote:
> Hi all

Thanks to all for the helpful replies.

Rob, you are correct, I had not realised I was adding attributes to the 
class instead of the instance. Your alternative does work correctly. Thanks.

Carl, I understand your concern about modifying attributes. In my particular 
case, this is not a problem, as the class is under my control, and an 
instance will not be modified once it is set up, but I agree one must be 
careful not to mis-use it.

My use-case is that I want to create a number of objects, I want to store 
them in a tuple/list so that I can retrieve them sequentially, and I also 
want to retrieve them individually by name. Normally I would create a tuple 
and a dictionary to serve the two purposes, but I thought this might be a 
convenient way to get both behaviours from the same structure.

Regarding adding elements after instantiation, I would subclass 'list', as 
suggested by others, and then add an 'add' method, like this -

    def add(self, name, value):
        setattr(self, name, value)
        self.append(value)

I tested this and it behaves as I want.

Having said all of this, I have realised that what I probably want is an 
ordered dict. I will play with the one in PyPi, hopefully it will render 
this entire discussion redundant. It was interesting, though, and I have 
learned a lot.

Thanks again

Frank




From gagsl-py2 at yahoo.com.ar  Wed Mar 31 07:58:03 2010
From: gagsl-py2 at yahoo.com.ar (Gabriel Genellina)
Date: Wed, 31 Mar 2010 08:58:03 -0300
Subject: Generating text from a regular expression
References: <w2gb32951aa1003310349l8938653fw7cd92b848701c9ac@mail.gmail.com>
Message-ID: <op.vafku1xrx6zn5v@lepton.softlabbsas.com.ar>

En Wed, 31 Mar 2010 07:49:14 -0300, Nathan Harmston  
<iwanttobeabadger at googlemail.com> escribi?:

> I have a slightly complicated/medium sized regular expression and I
> want to generate all possible words that it can match (to compare
> performance of regex against an acora based matcher). Using the
> regular expression as a grammar to generate all words in its language.
> I was wondering if this possible in Python or possible using anything.
> Google doesnt seem to give any obvious answers.

I've done this some time ago.
This recipe  
http://code.activestate.com/recipes/577041-merge-multiple-potentially-infinite-sorted-inputs-/
provides an infinite merge operation, required for effectively enumerating  
a regular language (with shorter strings first, else 'a*b' would get stuck  
repeating "a"s and never yielding any "b").
The example at the end shows the basics of how to use it (by hand) in a  
very simple case.
To enumerate all strings matching '(a|bc)*' one should invoke  
closure(product(['a'],['b','c'])), which gives:

'', 'a', 'aa', 'bc',
'aaa', 'abc', 'bca',
'aaaa', 'aabc', 'abca', 'bcaa', 'bcbc',
'aaaaa', 'aaabc', 'aabca', 'abcaa', 'abcbc', 'bcaaa', 'bcabc', 'bcbca',
...

Converting the former expression into the later function calls requires a  
parser (not shown -- and I won't be able to find it until Friday)

-- 
Gabriel Genellina



From python.list at tim.thechases.com  Wed Mar 31 08:01:57 2010
From: python.list at tim.thechases.com (Tim Chase)
Date: Wed, 31 Mar 2010 07:01:57 -0500
Subject: Generating text from a regular expression
In-Reply-To: <w2gb32951aa1003310349l8938653fw7cd92b848701c9ac@mail.gmail.com>
References: <w2gb32951aa1003310349l8938653fw7cd92b848701c9ac@mail.gmail.com>
Message-ID: <4BB339B5.3050505@tim.thechases.com>

Nathan Harmston wrote:
> I have a slightly complicated/medium sized regular expression
> and I want to generate all possible words that it can match
> (to compare performance of regex against an acora based
> matcher). Using the regular expression as a grammar to
> generate all words in its language. I was wondering if this
> possible in Python or possible using anything. Google doesnt
> seem to give any obvious answers.

Unless you limit your regexp to bounded regular expressions (you 
don't use the "*", "+" and unbounded-top-end "{...}" tokens), it 
has an infinite number of possible words that can match.  As a 
simple example, the regexp "a*" matches "" (the empty string), 
"a", "aa", "aaa", "aaaa"...and so on up to the limit of a string 
length.

There was a discussion on this a while back:

http://mail.python.org/pipermail/python-list/2010-February/1235120.html

so you might chat with the person who started that thread.  You 
basically have to write a regexp parser that generates code to 
generate the expressions, and even simple expressions such as 
"[a-z]{1,30}" can create an astronomical number of possible inputs.

-tkc





From piet at vanoostrum.org  Wed Mar 31 08:50:51 2010
From: piet at vanoostrum.org (Piet van Oostrum)
Date: Wed, 31 Mar 2010 14:50:51 +0200
Subject: os.walk restart
References: <a8c1c0df-cbfa-421c-a869-9f4c555a80ac@l11g2000pro.googlegroups.com>
Message-ID: <m239zg64es.fsf@cochabamba.vanoostrum.org>

You have no guarantee that on the next run the directories will be
visited in the same order as in the first run (this could depend on the
filesystem). So then remembering a last directory won't do it. You could
write each completed directory name to a file, and then on the second
run check whether a directory is in that list and skip the program run
for these.

Something like this (symbolically):

lastrun = map(string.strip, logfile.readlines())
newlog = ... open logfile in append mode ...

for root, dirs, files in os.walk(basedir):
    if root not in lastrun:
        run program
        newlog.write(root)
        newlog.flush()

-- 
Piet van Oostrum <piet at vanoostrum.org>
WWW: http://pietvanoostrum.com/
PGP key: [8DAE142BE17999C4]
Nu Fair Trade woonwaar op http://www.zylja.com


From jura.grozni at gmail.com  Wed Mar 31 09:01:34 2010
From: jura.grozni at gmail.com (azrael)
Date: Wed, 31 Mar 2010 06:01:34 -0700 (PDT)
Subject: wrapping data from groups
Message-ID: <2c51a367-73b3-4639-b8bf-fa6b6db90be2@b30g2000yqd.googlegroups.com>

Hi

Could anyone give me a hint about a problem I have. I want to wrap
data from  newsgroups like comp.lang.python. Is there anywhere out
some module for this or does google has something for this.


From jeanmichel at sequans.com  Wed Mar 31 09:02:16 2010
From: jeanmichel at sequans.com (Jean-Michel Pichavant)
Date: Wed, 31 Mar 2010 15:02:16 +0200
Subject: libpst - python bindings
In-Reply-To: <201003311036.32554.richard.lamboj@bilcom.at>
References: <201003311036.32554.richard.lamboj@bilcom.at>
Message-ID: <4BB347D8.7050202@sequans.com>

Richard Lamboj wrote:
> Hello,
>
> are there any python bindings for libpst?
>
> http://www.five-ten-sg.com/libpst/
> https://alioth.debian.org/projects/libpst/
>
> Kind Regards
>
> Richi
>   
http://www.lmgtfy.com/?q=libpst+python

3rd hit

Cheers,

JM


From steve at holdenweb.com  Wed Mar 31 09:28:32 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 31 Mar 2010 09:28:32 -0400
Subject: wrapping data from groups
In-Reply-To: <2c51a367-73b3-4639-b8bf-fa6b6db90be2@b30g2000yqd.googlegroups.com>
References: <2c51a367-73b3-4639-b8bf-fa6b6db90be2@b30g2000yqd.googlegroups.com>
Message-ID: <hovim3$i34$1@dough.gmane.org>

azrael wrote:
> Hi
> 
> Could anyone give me a hint about a problem I have. I want to wrap
> data from  newsgroups like comp.lang.python. Is there anywhere out
> some module for this or does google has something for this.

nntplib would be the normal starting point. I've used it, and it works
reasonably well.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From invalid at invalid.invalid  Wed Mar 31 10:13:32 2010
From: invalid at invalid.invalid (Grant Edwards)
Date: Wed, 31 Mar 2010 14:13:32 +0000 (UTC)
Subject: Generating text from a regular expression
References: <mailman.1371.1270032563.23598.python-list@python.org>
Message-ID: <hovlac$o7v$1@reader1.panix.com>

On 2010-03-31, Nathan Harmston <iwanttobeabadger at googlemail.com> wrote:

> I have a slightly complicated/medium sized regular expression and I
> want to generate all possible words that it can match
>
> I was wondering if this possible in Python or possible using
> anything. Google doesnt seem to give any obvious answers.

We did this one a couple weeks ago.

It's not possible in the general case (there are an infinite number of
matching words for many/most regular expressions).

-- 
Grant Edwards               grant.b.edwards        Yow! ... the MYSTERIANS are
                                  at               in here with my CORDUROY
                              gmail.com            SOAP DISH!!


From ptmcg at austin.rr.com  Wed Mar 31 11:23:48 2010
From: ptmcg at austin.rr.com (Paul McGuire)
Date: Wed, 31 Mar 2010 08:23:48 -0700 (PDT)
Subject: Generating text from a regular expression
References: <mailman.1371.1270032563.23598.python-list@python.org>
Message-ID: <829a8515-0c35-449e-abb9-2321092f2598@l25g2000yqd.googlegroups.com>

On Mar 31, 5:49?am, Nathan Harmston <iwanttobeabad... at googlemail.com>
wrote:
> Hi everyone,
>
> I have a slightly complicated/medium sized regular expression and I
> want to generate all possible words that it can match (to compare
> performance of regex against an acora based matcher).

The pyparsing wiki Examples page includes this regex inverter:
http://pyparsing.wikispaces.com/file/view/invRegex.py

>From the module header:
# Supports:
# - {n} and {m,n} repetition, but not unbounded + or * repetition
# - ? optional elements
# - [] character ranges
# - () grouping
# - | alternation

-- Paul


From jmontoyaz at gmail.com  Wed Mar 31 12:40:30 2010
From: jmontoyaz at gmail.com (Javier Montoya)
Date: Wed, 31 Mar 2010 09:40:30 -0700 (PDT)
Subject: associative array
Message-ID: <ede55ee3-ac4a-47ad-842a-6ad2caa351d6@r18g2000yqd.googlegroups.com>

Dear all,

I'm a newbie in python and would be acknowledge if somebody could shed
some light on associative arrays.
More precisely, I would like to create a multi-dimensional associative
array. I have for example a list of students which are identified
uniquely by their student IDs. Additionally, for each student I have
some information: FirstName, LastName, etc.

The array would have then the following form:
[StudentID] => [FirstName][LastName][Telephone]...[ ... ]

I would like to be able to access a field directly by using a
StudentID
[StudentID][FirstName]
[StudentID][LastName]

How could I manipulate such an array (create the array, add elements,
access data)?

Best wishes




From kushal.kumaran+python at gmail.com  Wed Mar 31 12:52:14 2010
From: kushal.kumaran+python at gmail.com (Kushal Kumaran)
Date: Wed, 31 Mar 2010 22:22:14 +0530
Subject: associative array
In-Reply-To: <ede55ee3-ac4a-47ad-842a-6ad2caa351d6@r18g2000yqd.googlegroups.com>
References: <ede55ee3-ac4a-47ad-842a-6ad2caa351d6@r18g2000yqd.googlegroups.com>
Message-ID: <z2j1e364c4e1003310952y671b6a23jcca3241ac22c1356@mail.gmail.com>

On Wed, Mar 31, 2010 at 10:10 PM, Javier Montoya <jmontoyaz at gmail.com> wrote:
> Dear all,
>
> I'm a newbie in python and would be acknowledge if somebody could shed
> some light on associative arrays.
> More precisely, I would like to create a multi-dimensional associative
> array. I have for example a list of students which are identified
> uniquely by their student IDs. Additionally, for each student I have
> some information: FirstName, LastName, etc.
>
> The array would have then the following form:
> [StudentID] => [FirstName][LastName][Telephone]...[ ... ]
>
> I would like to be able to access a field directly by using a
> StudentID
> [StudentID][FirstName]
> [StudentID][LastName]
>
> How could I manipulate such an array (create the array, add elements,
> access data)?
>

Did you try the python tutorial?  Dictionaries might be what you are
looking for.

http://docs.python.org/tutorial/datastructures.html#dictionaries

-- 
regards,
kushal


From jura.grozni at gmail.com  Wed Mar 31 12:58:40 2010
From: jura.grozni at gmail.com (azrael)
Date: Wed, 31 Mar 2010 09:58:40 -0700 (PDT)
Subject: wrapping data from groups
References: <2c51a367-73b3-4639-b8bf-fa6b6db90be2@b30g2000yqd.googlegroups.com>
	<mailman.1376.1270042130.23598.python-list@python.org>
Message-ID: <d01bc7f6-c256-4678-a79b-00c98bf47794@30g2000yqi.googlegroups.com>

I tried to use some servers I know but they have a limited amount of
stored threads. not like google that has every thread ever opened. so
I tried to wrap google's html but I get a 403 error. any sugesstions?





On Mar 31, 3:28?pm, Steve Holden <st... at holdenweb.com> wrote:
> azrael wrote:
> > Hi
>
> > Could anyone give me a hint about a problem I have. I want to wrap





> > data from ?newsgroups like comp.lang.python. Is there anywhere out
> > some module for this or does google has something for this.
>
> nntplib would be the normal starting point. I've used it, and it works
> reasonably well.
>
> regards
> ?Steve
> --
> Steve Holden ? ? ? ? ? +1 571 484 6266 ? +1 800 494 3119
> See PyCon Talks from Atlanta 2010 ?http://pycon.blip.tv/
> Holden Web LLC ? ? ? ? ? ? ? ?http://www.holdenweb.com/
> UPCOMING EVENTS: ? ? ? ?http://holdenweb.eventbrite.com/



From ccurvey at gmail.com  Wed Mar 31 13:08:50 2010
From: ccurvey at gmail.com (Chris Curvey)
Date: Wed, 31 Mar 2010 10:08:50 -0700 (PDT)
Subject: sorting ascending/descending with operator.attrgetter
Message-ID: <a8c7b02e-73d8-4ae2-a76a-e54a01bd22f5@b30g2000yqd.googlegroups.com>

I must be having a brain cramp.  Given a list of objects, how can I
sort the list on one attribute in descending order, then sort within
each group in ascending order on another attribute.

For example:

class Foo:
    def __init__(self, a, b, c):
        self.a = a
        self.b = b
        self.c = c


I can do "allmyfoos.sort(operator.attrgetter('a','b'))" to sort
ascending on both attributes, but how could i sort by "a, descending,
then b, ascending)?"





From tomf.sessile at gmail.com  Wed Mar 31 13:21:36 2010
From: tomf.sessile at gmail.com (TomF)
Date: Wed, 31 Mar 2010 10:21:36 -0700
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<mailman.1317.1269964918.23598.python-list@python.org>
	<4bb22b39$0$1638$742ec2ed@news.sonic.net>
	<mailman.1326.1269971785.23598.python-list@python.org>
	<20100330201609.6ef12ee1@vulcan.local>
	<87sk7h8vns.fsf@castleamber.com>
	<5ef544bb-95a0-4329-80ef-f679d62b8ead@z11g2000yqz.googlegroups.com>
	<houv8a$ed9$02$2@news.t-online.com>
Message-ID: <2010033110213616807-tomfsessile@gmailcom>

On 2010-03-31 00:57:51 -0700, Peter Otten <__peter__ at web.de> said:
> Pierre Quentel wrote:
> 
>> I'm surprised nobody proposed a solution with itertools ;-)
> 
> next(itertools.takewhile(lambda _: a == b, ["yes"]), "no")
> 
> You spoke to soon :)

I salute you, sir, for upholding the standards of this group.

-Tom



From safoo.alahmadi at gmail.com  Wed Mar 31 13:30:39 2010
From: safoo.alahmadi at gmail.com (safwan alahmadi)
Date: Wed, 31 Mar 2010 10:30:39 -0700 (PDT)
Subject: Video is very funny..hhhhhhhhhhhh
Message-ID: <9ba61e22-bcca-4684-a5d6-1fd587641525@8g2000yqz.googlegroups.com>



hhhhhhhhhhhh

Video is very funny

http://www.youtube.com/watch?v=-cKvPp71QFY


From mail at timgolden.me.uk  Wed Mar 31 13:35:00 2010
From: mail at timgolden.me.uk (Tim Golden)
Date: Wed, 31 Mar 2010 18:35:00 +0100
Subject: sorting ascending/descending with operator.attrgetter
In-Reply-To: <a8c7b02e-73d8-4ae2-a76a-e54a01bd22f5@b30g2000yqd.googlegroups.com>
References: <a8c7b02e-73d8-4ae2-a76a-e54a01bd22f5@b30g2000yqd.googlegroups.com>
Message-ID: <4BB387C4.5010002@timgolden.me.uk>

On 31/03/2010 18:08, Chris Curvey wrote:
> I must be having a brain cramp.  Given a list of objects, how can I
> sort the list on one attribute in descending order, then sort within
> each group in ascending order on another attribute.
>
> For example:
>
> class Foo:
>      def __init__(self, a, b, c):
>          self.a = a
>          self.b = b
>          self.c = c

I think this is the kind of thing you're after...

http://ramblings.timgolden.me.uk/2009/10/15/reverse-sorting-on-arbitrary-key-segments/

... at least the link to the Wiki should help:

http://wiki.python.org/moin/HowTo/Sorting

TJG


From gherron at digipen.edu  Wed Mar 31 13:36:22 2010
From: gherron at digipen.edu (Gary Herron)
Date: Wed, 31 Mar 2010 10:36:22 -0700
Subject: associative array
In-Reply-To: <ede55ee3-ac4a-47ad-842a-6ad2caa351d6@r18g2000yqd.googlegroups.com>
References: <ede55ee3-ac4a-47ad-842a-6ad2caa351d6@r18g2000yqd.googlegroups.com>
Message-ID: <4BB38816.4030305@digipen.edu>

Javier Montoya wrote:
> Dear all,
>
> I'm a newbie in python and would be acknowledge if somebody could shed
> some light on associative arrays.
> More precisely, I would like to create a multi-dimensional associative
> array. I have for example a list of students which are identified
> uniquely by their student IDs. Additionally, for each student I have
> some information: FirstName, LastName, etc.
>
> The array would have then the following form:
> [StudentID] => [FirstName][LastName][Telephone]...[ ... ]
>
> I would like to be able to access a field directly by using a
> StudentID
> [StudentID][FirstName]
> [StudentID][LastName]
>
> How could I manipulate such an array (create the array, add elements,
> access data)?
>
> Best wishes
>
>
>   
Create a class for student with attributes for ID, FirstName, LastName, etc.

  class Student:
      def __init__(self, id, FirstName, ...):
          self.id = id
          self.FirstName = FirstName
          ...

then whenever you create a student object, use a dictionary to associate 
the object with its is
  AA = {} # An empty dictionary
  s = Student(...)
  AA[s.id] = s
  ... and repeat for many students...

Then to access a student's object given an id:
  s = AA[id]
  print s.id, s.FirstName, s.LastName, ...


I'd *not* call this a multi-dimension association, but rather just an 
association between student objects and their ids.

Hope that helps,

Gary Herron

-- 
Gary Herron, PhD.
Department of Computer Science
DigiPen Institute of Technology
(425) 895-4418




From __peter__ at web.de  Wed Mar 31 13:49:08 2010
From: __peter__ at web.de (Peter Otten)
Date: Wed, 31 Mar 2010 19:49:08 +0200
Subject: sorting ascending/descending with operator.attrgetter
References: <a8c7b02e-73d8-4ae2-a76a-e54a01bd22f5@b30g2000yqd.googlegroups.com>
Message-ID: <hp01su$ma6$02$1@news.t-online.com>

Chris Curvey wrote:

> I must be having a brain cramp.  Given a list of objects, how can I
> sort the list on one attribute in descending order, then sort within
> each group in ascending order on another attribute.
> 
> For example:
> 
> class Foo:
>     def __init__(self, a, b, c):
>         self.a = a
>         self.b = b
>         self.c = c
> 
> 
> I can do "allmyfoos.sort(operator.attrgetter('a','b'))" to sort
> ascending on both attributes, but how could i sort by "a, descending,
> then b, ascending)?"

In the general case you have to sort twice:

>>> from collections import namedtuple
>>> Foo = namedtuple("Foo", "a b")
>>> items = [Foo(x, y) for x in range(3) for y in range(3)]
>>> def show(items):
...     for item in items: print item
...
>>> show(items)
Foo(a=0, b=0)
Foo(a=0, b=1)
Foo(a=0, b=2)
Foo(a=1, b=0)
Foo(a=1, b=1)
Foo(a=1, b=2)
Foo(a=2, b=0)
Foo(a=2, b=1)
Foo(a=2, b=2)
>>> from operator import attrgetter
>>> items.sort(key=attrgetter("b"))
>>> items.sort(key=attrgetter("a"), reverse=True)
>>> show(items)
Foo(a=2, b=0)
Foo(a=2, b=1)
Foo(a=2, b=2)
Foo(a=1, b=0)
Foo(a=1, b=1)
Foo(a=1, b=2)
Foo(a=0, b=0)
Foo(a=0, b=1)
Foo(a=0, b=2)

This is guaranteed to work because list.sort() is "stable", i. e. it doesn't 
alter the order of items with equal keys.

Peter


From nathan.alexander.rice at gmail.com  Wed Mar 31 13:58:58 2010
From: nathan.alexander.rice at gmail.com (Nathan Rice)
Date: Wed, 31 Mar 2010 13:58:58 -0400
Subject: Question about list comprehension/standard "for" disparities
Message-ID: <y2s3e2a7ec1003311058p13c387d9r1cc31949fbf6817b@mail.gmail.com>

I was just wondering, why the list/generator and standard "for" have
disparities?

It would be really nice to be able to do:

for x in y if foo:
    ...

rather than:

for x in (x for x in y if foo):
    ...

Also, from a style standpoint, I prefer to extract the loop logic into a
function if it's more than a few lines long.  As a result, most of my loops
are of the form:

for x in y:
    bar(x)

So I frequently end up using map.  As I understand it, there is some
discussion of removing map() in favor of comprehensions.  Is there any
reason why the for syntax could not be expanded to accommodate statements of
the form:

bar(x) for x in y

?

This inconsistency really bothered me when I started playing with python,
and it seems kind of at-odds with the "one right way to do things"
mentality.

-Nathan
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From wescpy at gmail.com  Wed Mar 31 14:01:58 2010
From: wescpy at gmail.com (wesley chun)
Date: Wed, 31 Mar 2010 11:01:58 -0700
Subject: ANN: Intro+Intermediate Python course, SF, May 10-12
Message-ID: <z2m78b3a9581003311101ga24ddd63ze42bd4608bfaa137@mail.gmail.com>

Need to get up-to-speed with Python as quickly as possible? Come join
me, Wesley Chun, author of Prentice-Hall's bestseller "Core Python
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download (reg req'd):
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- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
"Core Python Programming", Prentice Hall, (c)2007,2001
"Python Fundamentals", Prentice Hall, (c)2009
    http://corepython.com

wesley.j.chun :: wescpy-at-gmail.com
python training and technical consulting
cyberweb.consulting : silicon valley, ca
http://cyberwebconsulting.com


From nagle at animats.com  Wed Mar 31 14:05:58 2010
From: nagle at animats.com (John Nagle)
Date: Wed, 31 Mar 2010 11:05:58 -0700
Subject: "Usability, the Soul of Python"
In-Reply-To: <hosnrh$6na$1@news.eternal-september.org>
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>	<4bb14173$0$1640$742ec2ed@news.sonic.net>
	<mailman.1300.1269939807.23598.python-list@python.org>
	<hosnrh$6na$1@news.eternal-september.org>
Message-ID: <4bb38a31$0$1595$742ec2ed@news.sonic.net>

Alf P. Steinbach wrote:
> * Jean-Michel Pichavant:
>> John Nagle wrote:
>>> Jonathan Hayward wrote:
>>>> I've posted "Usability, the Soul of Python: An Introduction to the
>>>> Python Programming Language Through the Eyes of Usability", at:
>>>>
>>>>    http://JonathansCorner.com/python/
>>>
>>>    No, it's just a rather verbose introduction to Python, in dark brown
>>> type on a light brown background.  One could write a good paper on this
>>> topic, but this isn't it.
>>>
>>>
>>>                 John Nagle
>> Why is it bad ?
> 
> Consider
> 
> 
> <quote>
>  From a usability standpoint, the braces go with the lines to print out 
> the stanza rather than the for statement or the code after, so the 
> following is best:

    The last time I ran a C++ project, I just had everyone run their
code through Artistic Style ("http://astyle.sourceforge.net") with
"--style=ansi".  No more inconsistencies.

				John Nagle


From see at sig.for.address  Wed Mar 31 14:58:03 2010
From: see at sig.for.address (Victor Eijkhout)
Date: Wed, 31 Mar 2010 13:58:03 -0500
Subject: sort array, apply rearrangement to second
References: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
	<mailman.1358.1270004482.23598.python-list@python.org>
Message-ID: <1jg81f7.5ub3191oci9fkN%see@sig.for.address>

Robert Kern <robert.kern at gmail.com> wrote:

> second[first.argsort()]

Really cool. Thanks.

> Ask numpy questions on the numpy mailing list.

I will. I thought that this question would have an answer in a generic
python idiom.

Victor.
-- 
Victor Eijkhout -- eijkhout at tacc utexas edu


From pmaupin at gmail.com  Wed Mar 31 15:05:24 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Wed, 31 Mar 2010 12:05:24 -0700 (PDT)
Subject: sorting ascending/descending with operator.attrgetter
References: <a8c7b02e-73d8-4ae2-a76a-e54a01bd22f5@b30g2000yqd.googlegroups.com>
Message-ID: <96712ef1-5c10-455b-904c-c2436736c9d2@35g2000yqm.googlegroups.com>

On Mar 31, 12:08?pm, Chris Curvey <ccur... at gmail.com> wrote:
> I must be having a brain cramp. ?Given a list of objects, how can I
> sort the list on one attribute in descending order, then sort within
> each group in ascending order on another attribute.
>
> For example:
>
> class Foo:
> ? ? def __init__(self, a, b, c):
> ? ? ? ? self.a = a
> ? ? ? ? self.b = b
> ? ? ? ? self.c = c
>
> I can do "allmyfoos.sort(operator.attrgetter('a','b'))" to sort
> ascending on both attributes, but how could i sort by "a, descending,
> then b, ascending)?"

You can provide a cmp function to the string sort method, e.g. cmp =
lambda x,y: -cmp(x.a, y.a) or cmp(x.b, y.b)

You can also possibly gain some efficiency by using key instead of
cmp.
For example, if one of the objects is numeric, you can call sort()
with something like key = lambda x:(-x.a, x.b)

Or if b is numeric but a is a string, you could use lambda x:(x.a, -
x.b) and then use list.reverse() afterward.

HTH,
Pat


From gatoygata2 at gmail.com  Wed Mar 31 15:11:18 2010
From: gatoygata2 at gmail.com (Joaquin Abian)
Date: Wed, 31 Mar 2010 12:11:18 -0700 (PDT)
Subject: (a==b) ? 'Yes' : 'No'
References: <c46b6e08-170a-4ded-b058-07bab8a3ee7e@y17g2000yqd.googlegroups.com>
	<7316f3d2-bcc9-4a1a-8598-cdd5d41fd74b@k17g2000yqb.googlegroups.com> 
	<hou0rt$69n$2@lust.ihug.co.nz>
Message-ID: <a3f80702-e59d-40de-9398-a0d4e52a1a5f@8g2000yqz.googlegroups.com>

On Mar 31, 1:18?am, Lawrence D'Oliveiro <l... at geek-
central.gen.new_zealand> wrote:
> In message <7316f3d2-bcc9-4a1a-8598-
>
> cdd5d41fd... at k17g2000yqb.googlegroups.com>, Joaquin Abian wrote:
> > (a==b) and 'YES' or 'NO'
>
> > Yes, ugly
>
> Why would you say that?s ugly?
>
> By the way, you don?t need the parentheses.

Lawrence,
maybe it was not the perfect adjective. I meant 'not beautiful'
because for me it is not an expression I can easily read. It is not
internalized in my brain. I know how to use it because I learnt how to
do it time ago(in Learning Python) but always I have to think how it
works (like a mental translation). For me the other alternative
expresion is more readable:

take_it if you_have_it else search_for_it

this was already in my brain before I started writing python code.
Thus, I prefer this option for my code. On the other hand, in my post,
I proposed the and/or style because I found interesting how
symmetrical it was with the one the OP was refering:

(a==b)  ?  'Yes'  : 'No'
(a==b) and 'Yes' or 'No'


I know, I could write it without parenthesis but it seems more
naturally organized with it and I read it faster and clearly. I dont
know exactly why but it seems also safer to me.

Joaquin


From robert.kern at gmail.com  Wed Mar 31 15:13:52 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 31 Mar 2010 14:13:52 -0500
Subject: sort array, apply rearrangement to second
In-Reply-To: <1jg81f7.5ub3191oci9fkN%see@sig.for.address>
References: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>	<mailman.1358.1270004482.23598.python-list@python.org>
	<1jg81f7.5ub3191oci9fkN%see@sig.for.address>
Message-ID: <hp06th$47o$1@dough.gmane.org>

On 2010-03-31 13:58 PM, Victor Eijkhout wrote:
> Robert Kern<robert.kern at gmail.com>  wrote:
>
>> second[first.argsort()]
>
> Really cool. Thanks.
>
>> Ask numpy questions on the numpy mailing list.
>
> I will. I thought that this question would have an answer in a generic
> python idiom.

When dealing with numpy arrays, the generic Python idiom is often much slower.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From ricaraoz at gmail.com  Wed Mar 31 15:21:48 2010
From: ricaraoz at gmail.com (=?ISO-8859-1?Q?Ricardo_Ar=E1oz?=)
Date: Wed, 31 Mar 2010 16:21:48 -0300
Subject: "Usability, the Soul of Python"
In-Reply-To: <hou162$69n$3@lust.ihug.co.nz>
References: <cf7c81cd-ee36-4168-a848-37911a584139@i25g2000yqm.googlegroups.com>	<4bb14173$0$1640$742ec2ed@news.sonic.net>	<mailman.1300.1269939807.23598.python-list@python.org>	<hosnrh$6na$1@news.eternal-september.org>	<20100331003241.47fa91f6@vulcan.local>
	<hou162$69n$3@lust.ihug.co.nz>
Message-ID: <4BB3A0CC.2090409@gmail.com>

Lawrence D'Oliveiro wrote:
> In message <20100331003241.47fa91f6 at vulcan.local>, Robert Fendt wrote:
>
>   
>> The braces are gone, and with them the holy wars.
>>     
>
> Let me start a new one. I would still put in some kind of explicit indicator 
> of the end of the grouping construct:
>
>     count = 99
>     while count > 0:
>         print u'%d slabs of spam in my mail!' % count
>         print u'%d slabs of spam,' % count
>         print u'Send one to abuse and Just Hit Delete,'
>         count += 1
>         print u'%d slabs of spam in my mail!' % count
>         print u''
>     #end while
>   
<irony>
    I'd much prefer the following :

        ## Beginning of a program block
        count = 99      # Set the variable count as a name for the
integer object 99
        while count > 0:      # if count is the name of 0 or less then
exit the loop (this will NEVER happen)
            ## Beginning of a while loop
            print u'%d slabs of spam in my mail!' % count
            print u'%d slabs of spam,' % count
            print u'Send one to abuse and Just Hit Delete,'
            count += 1
            print u'%d slabs of spam in my mail!' % count
            print u''
            ## End of a while loop
        ## End of a program block

    Which is reeeaaally easier to understand than :

        count = 99
        while True
            print u'%d slabs of spam in my mail!' % count
            print u'%d slabs of spam,' % count
            print u'Send one to abuse and Just Hit Delete,'
            count += 1
            print u'%d slabs of spam in my mail!' % count
            print u''

</irony>

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From steve at holdenweb.com  Wed Mar 31 15:22:26 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 31 Mar 2010 15:22:26 -0400
Subject: sort array, apply rearrangement to second
In-Reply-To: <1jg81f7.5ub3191oci9fkN%see@sig.for.address>
References: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>	<mailman.1358.1270004482.23598.python-list@python.org>
	<1jg81f7.5ub3191oci9fkN%see@sig.for.address>
Message-ID: <hp07dr$6c5$1@dough.gmane.org>

Victor Eijkhout wrote:
> Robert Kern <robert.kern at gmail.com> wrote:
> 
>> second[first.argsort()]
> 
> Really cool. Thanks.
> 
>> Ask numpy questions on the numpy mailing list.
> 
> I will. I thought that this question would have an answer in a generic
> python idiom.
> 
> Victor.

Not an unreasonable assumption, but it turns out that for most Python
users (estimate PFTA: 97%) numpy/scipt is esoteric knowledge.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From python at rcn.com  Wed Mar 31 16:09:54 2010
From: python at rcn.com (Raymond Hettinger)
Date: Wed, 31 Mar 2010 13:09:54 -0700 (PDT)
Subject: sort array, apply rearrangement to second
References: <1jg6j1v.oxpx651vbq67mN%see@sig.for.address>
Message-ID: <8d8415a5-ba77-4dc3-b870-f159886e76b5@i25g2000yqm.googlegroups.com>

On Mar 30, 4:25?pm, s... at sig.for.address (Victor Eijkhout) wrote:
> I have two arrays, made with numpy. The first one has values that I want
> to use as sorting keys; the second one needs to be sorted by those keys.
> Obviously I could turn them into a dictionary ?of pairs and sort by the
> first member, but I think that's not very efficient, at least in space,
> and this needs to be done as efficiently as possible.

Alf's recommendation is clean and correct.  Just make a list of
tuples.

FWIW, here's a little hack that does the work for you:

>>> values = ['A', 'B', 'C', 'D', 'E']
>>> keys = [50, 20, 40, 10, 30]
>>> keyiter = iter(keys)
>>> sorted(values, key=lambda k: next(keyiter))
['D', 'B', 'E', 'C', 'A']


Raymond


From pulikesimahesh at gmail.com  Wed Mar 31 16:18:44 2010
From: pulikesimahesh at gmail.com (SWETHA)
Date: Wed, 31 Mar 2010 13:18:44 -0700 (PDT)
Subject: Want / Need Genuine Google Adsense Account for Rs.300/-
Message-ID: <f0890262-12ad-4c81-be2e-feef2a786740@g1g2000pre.googlegroups.com>

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From icanbob at gmail.com  Wed Mar 31 16:21:16 2010
From: icanbob at gmail.com (bobicanprogram)
Date: Wed, 31 Mar 2010 13:21:16 -0700 (PDT)
Subject: Python + OpenOffice Calc
References: <4bb2fe14$0$1120$4fafbaef@reader3.news.tin.it>
Message-ID: <1233c19f-3268-4e57-bec7-e72c17941981@z9g2000vbm.googlegroups.com>

On Mar 31, 2:47 am, Tracubik <affdfsdfds... at b.com> wrote:
> Hi all!
> i'm giving away to a friend of mine that have a garage (he repair car) my
> old computer. He will use it essentialy to create estimates of the work
> via an ods file (i've made a simple ods file to be filled with the cost of
> materials and a description of the work).
> He's totally new with computer and have difficult to fill the ods file, so
> i'ld like to create a simple python program that help him to introduce the
> data in to the ods file via a simple gui.
> So what i'm looking for is a way in python to insert data in a particular
> cell of the ods file and possibly to save it and print it when it's full
> filled with data.
>
> the guy is similar to this:
>
> 3 fields: quantity - description of the piece bought - price
>
> a way to add a new "line" if needed (for a new piece entry) similar to the
> "add rule" in evolution
>
> 1 text field for the description of the work + 1 field for the price of
> the work
>
> and off course a way to insert this data in to the ods file via python
>
> Any hints/tutorial/info?
>
> thanks
> Nico


OOcalc supports a little known feature whereby data can be
automatically sync'd between the spreadsheet and an HTML table.   A
few years ago I did up a demo of this in action using Tcl/Tk (http://
www.icanprogram.com/hosug).  It should not be too hard to port this
idea to Python.

bob


From steve at holdenweb.com  Wed Mar 31 16:21:17 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 31 Mar 2010 16:21:17 -0400
Subject: Question about list comprehension/standard "for" disparities
In-Reply-To: <y2s3e2a7ec1003311058p13c387d9r1cc31949fbf6817b@mail.gmail.com>
References: <y2s3e2a7ec1003311058p13c387d9r1cc31949fbf6817b@mail.gmail.com>
Message-ID: <hp0as7$j60$1@dough.gmane.org>

Nathan Rice wrote:
> I was just wondering, why the list/generator and standard "for" have
> disparities?
> 
> It would be really nice to be able to do:
> 
> for x in y if foo:
>     ...
> 
> rather than:
> 
> for x in (x for x in y if foo):
>     ...
> 
But it's not much of an issue when you can easily write

for x in y:
    if foo:
        ...

is it? What's the advantage of your preferred format that overrides its
reduced readability?

> Also, from a style standpoint, I prefer to extract the loop logic into a
> function if it's more than a few lines long.  As a result, most of my
> loops are of the form:
> 
> for x in y:
>     bar(x)
> 
> So I frequently end up using map.  As I understand it, there is some
> discussion of removing map() in favor of comprehensions.  Is there any
> reason why the for syntax could not be expanded to accommodate
> statements of the form:
> 
> bar(x) for x in y
> 
> ?
> 
Put parentheses around it and you have a generator expression, which
sounds like it's exactly what you want: a lazy way of producing a
sequence of values:

>>> y = ["this", "that", "and", "the", "other"]
>>> def bar(x):
...     return 2*x
...
>>> ge = (bar(x) for x in y)
>>> ge
<generator object at 0x7ff28f2c>
>>> for x in ge:
...   print x
...
thisthis
thatthat
andand
thethe
otherother
>>>

If you need to use the sequence repeatedly then a list comprehension is
clearly better, since you don't exhaust it by iterating over it.

I doubt map's going to disappear, but neither are comprehensions or
generator expressions.

> This inconsistency really bothered me when I started playing with
> python, and it seems kind of at-odds with the "one right way to do
> things" mentality.
> 
That's the Platonic ideal, but the real world is a dirty place and
Python lives firmly in the real world!

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From sccolbert at gmail.com  Wed Mar 31 16:38:04 2010
From: sccolbert at gmail.com (Chris Colbert)
Date: Wed, 31 Mar 2010 16:38:04 -0400
Subject: Python + OpenOffice Calc
In-Reply-To: <1233c19f-3268-4e57-bec7-e72c17941981@z9g2000vbm.googlegroups.com>
References: <4bb2fe14$0$1120$4fafbaef@reader3.news.tin.it>
	<1233c19f-3268-4e57-bec7-e72c17941981@z9g2000vbm.googlegroups.com>
Message-ID: <y2q7f014ea61003311338qefe75d13z287c635e6262cfb0@mail.gmail.com>

On Wed, Mar 31, 2010 at 4:21 PM, bobicanprogram <icanbob at gmail.com> wrote:

> On Mar 31, 2:47 am, Tracubik <affdfsdfds... at b.com> wrote:
> > Hi all!
> > i'm giving away to a friend of mine that have a garage (he repair car) my
> > old computer. He will use it essentialy to create estimates of the work
> > via an ods file (i've made a simple ods file to be filled with the cost
> of
> > materials and a description of the work).
> > He's totally new with computer and have difficult to fill the ods file,
> so
> > i'ld like to create a simple python program that help him to introduce
> the
> > data in to the ods file via a simple gui.
> > So what i'm looking for is a way in python to insert data in a particular
> > cell of the ods file and possibly to save it and print it when it's full
> > filled with data.
> >
> > the guy is similar to this:
> >
> > 3 fields: quantity - description of the piece bought - price
> >
> > a way to add a new "line" if needed (for a new piece entry) similar to
> the
> > "add rule" in evolution
> >
> > 1 text field for the description of the work + 1 field for the price of
> > the work
> >
> > and off course a way to insert this data in to the ods file via python
> >
> > Any hints/tutorial/info?
> >
> > thanks
> > Nico
>
>
> OOcalc supports a little known feature whereby data can be
> automatically sync'd between the spreadsheet and an HTML table.   A
> few years ago I did up a demo of this in action using Tcl/Tk (http://
> www.icanprogram.com/hosug).  It should not be too hard to port this
> idea to Python.
>
> bob
> --
> http://mail.python.org/mailman/listinfo/python-list
>

if he cant click on a cell in oocalc, what makes you think he'll be able to
use your program?
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From lxkain at gmail.com  Wed Mar 31 16:59:01 2010
From: lxkain at gmail.com (LX)
Date: Wed, 31 Mar 2010 13:59:01 -0700 (PDT)
Subject: decorators only when __debug__ == True
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>
	<mailman.1295.1269912866.23598.python-list@python.org>
	<7778821c-84f3-4829-8e05-85134c5d6c5b@y17g2000yqd.googlegroups.com>
	<mailman.1333.1269985284.23598.python-list@python.org>
Message-ID: <d2fd9d5f-e882-4e02-a569-6c9e39996c4d@k17g2000yqb.googlegroups.com>

On Mar 30, 2:41?pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
> LX wrote:
> > On Mar 29, 6:34 pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
> >> LX wrote:
> >>> Hi all, I have a question about decorators. I would like to use them
> >>> for argument checking, and pre/post conditions. However, I don't want
> >>> the additional overhead when I run in non-debug mode. I could do
> >>> something like this, using a simple trace example.
> >>> @decorator
> >>> def pass_decorator(f, *args, **kw): # what about the slow-down that
> >>> incurs when using pass_decorator?
> >>> ? ? return f(*args, **kw)
> >>> @decorator
> >>> def trace_decorator(f, *args, **kw):
> >>> ? ? print "calling %s with args %s, %s" % (f.func_name, args, kw)
> >>> ? ? return f(*args, **kw)
> >>> trace_enable_flag = False #__debug__
> >>> trace = trace_decorator if trace_enable_flag else pass_decorator
> >>> Trouble is, there is still an additional encapsulating function call.
> >>> Is there any way to eliminate the extra function call altogether?
> >>> Thanks in advance!
> >> I think you have misunderstood certain details about decorators.
>
> >> This code with adecorator:
>
> >> ? ? ?@decorator
> >> ? ? ?def hello():
> >> ? ? ? ? ?print "hello world"
>
> >> basically does this:
>
> >> ? ? ?def hello():
> >> ? ? ? ? ?print "hello world"
> >> ? ? ?hello =decorator(hello)
>
> >> so your non-decoratorjust needs to return the function it was passed:
>
> >> ? ? ?def pass_decorator(func):
> >> ? ? ? ? ?return func
>
> >> and your tracedecoratorwould be something like this:
>
> >> ? ? ?def trace_decorator(func):
> >> ? ? ? ? ?def show(*args, **kwargs):
> >> ? ? ? ? ? ? ?print "calling %s with args %s, %s" % (func.func_name,
> >> args, kwargs)
> >> ? ? ? ? ? ? ?result = func(*args, **kwargs)
> >> ? ? ? ? ? ? ?print "returning %s from %s" % (result, func.func_name)
> >> ? ? ? ? ? ? ?return result
> >> ? ? ? ? ?return show
>
> > Sure, but during runtime, pass_decorator will still be called, even
> > though it doesn't do anything. I am wondering if I can disable this
> > additional function call at non-debug runtime. In other words, I want
> > the calling stack to contain nodecoratorat all, not even
> > pass_decorator.
>
> > I should mention that, in my code, the symbol "decorator" is imported
> > from Michele Simionato'sdecorator.py file.
>
> pass_decorator will be called when the decorated function is _defined_,
> but not when the decorated function is _called_.

Why is it then that during runtime, with a breakpoint in some
arbitrary main() in main.py, I get something similar to the following
call stack:

main.py, line xxx, in <module>
 main()

<string>, line 2, in main

decorator.py, line 261, in pass_decorator
 return f(*args, **kw)

main.py, line yyy, in main()
 * breakpoint line here *

It looks to me the call stack still includes the additional level of
the decorator... what am I missing? Thank you for your time.


From novacompute at gmail.com  Wed Mar 31 17:26:24 2010
From: novacompute at gmail.com (wukong)
Date: Wed, 31 Mar 2010 14:26:24 -0700 (PDT)
Subject: subprocess only good for win32?
Message-ID: <353133a8-ff39-4b36-b96d-4836cea621bf@j41g2000vbe.googlegroups.com>

subprocess works fine on my win pro 32-bit, but not on vista 64-bit.
am i doing some wrong, or it just won't work for win64?  If that's
true, will it be extended to win64 in teh future?
thanks in advance
wk


From python at mrabarnett.plus.com  Wed Mar 31 17:27:05 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Wed, 31 Mar 2010 22:27:05 +0100
Subject: decorators only when __debug__ == True
In-Reply-To: <d2fd9d5f-e882-4e02-a569-6c9e39996c4d@k17g2000yqb.googlegroups.com>
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>	<mailman.1295.1269912866.23598.python-list@python.org>	<7778821c-84f3-4829-8e05-85134c5d6c5b@y17g2000yqd.googlegroups.com>	<mailman.1333.1269985284.23598.python-list@python.org>
	<d2fd9d5f-e882-4e02-a569-6c9e39996c4d@k17g2000yqb.googlegroups.com>
Message-ID: <4BB3BE29.70504@mrabarnett.plus.com>

LX wrote:
> On Mar 30, 2:41 pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
>> LX wrote:
>>> On Mar 29, 6:34 pm, MRAB <pyt... at mrabarnett.plus.com> wrote:
>>>> LX wrote:
>>>>> Hi all, I have a question about decorators. I would like to use them
>>>>> for argument checking, and pre/post conditions. However, I don't want
>>>>> the additional overhead when I run in non-debug mode. I could do
>>>>> something like this, using a simple trace example.
>>>>> @decorator
>>>>> def pass_decorator(f, *args, **kw): # what about the slow-down that
>>>>> incurs when using pass_decorator?
>>>>>     return f(*args, **kw)
>>>>> @decorator
>>>>> def trace_decorator(f, *args, **kw):
>>>>>     print "calling %s with args %s, %s" % (f.func_name, args, kw)
>>>>>     return f(*args, **kw)
>>>>> trace_enable_flag = False #__debug__
>>>>> trace = trace_decorator if trace_enable_flag else pass_decorator
>>>>> Trouble is, there is still an additional encapsulating function call.
>>>>> Is there any way to eliminate the extra function call altogether?
>>>>> Thanks in advance!
>>>> I think you have misunderstood certain details about decorators.
>>>> This code with adecorator:
>>>>      @decorator
>>>>      def hello():
>>>>          print "hello world"
>>>> basically does this:
>>>>      def hello():
>>>>          print "hello world"
>>>>      hello =decorator(hello)
>>>> so your non-decoratorjust needs to return the function it was passed:
>>>>      def pass_decorator(func):
>>>>          return func
>>>> and your tracedecoratorwould be something like this:
>>>>      def trace_decorator(func):
>>>>          def show(*args, **kwargs):
>>>>              print "calling %s with args %s, %s" % (func.func_name,
>>>> args, kwargs)
>>>>              result = func(*args, **kwargs)
>>>>              print "returning %s from %s" % (result, func.func_name)
>>>>              return result
>>>>          return show
>>> Sure, but during runtime, pass_decorator will still be called, even
>>> though it doesn't do anything. I am wondering if I can disable this
>>> additional function call at non-debug runtime. In other words, I want
>>> the calling stack to contain nodecoratorat all, not even
>>> pass_decorator.
>>> I should mention that, in my code, the symbol "decorator" is imported
>>> from Michele Simionato'sdecorator.py file.
>> pass_decorator will be called when the decorated function is _defined_,
>> but not when the decorated function is _called_.
> 
> Why is it then that during runtime, with a breakpoint in some
> arbitrary main() in main.py, I get something similar to the following
> call stack:
> 
> main.py, line xxx, in <module>
>  main()
> 
> <string>, line 2, in main
> 
> decorator.py, line 261, in pass_decorator
>  return f(*args, **kw)
> 
> main.py, line yyy, in main()
>  * breakpoint line here *
> 
> It looks to me the call stack still includes the additional level of
> the decorator... what am I missing? Thank you for your time.

Are you still defining your decorators in the same way as in your
original post?

A decorator shouldn't call the function it's decorating.

My version of pass_decorator just returns the function it's decorating,
not call it, and my version of trace_decorator returns a locally-defined
function which will call the decorated function.


From apt.shansen at gmail.invalid  Wed Mar 31 17:28:27 2010
From: apt.shansen at gmail.invalid (Stephen Hansen)
Date: Wed, 31 Mar 2010 14:28:27 -0700
Subject: decorators only when __debug__ == True
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>
	<mailman.1295.1269912866.23598.python-list@python.org>
	<7778821c-84f3-4829-8e05-85134c5d6c5b@y17g2000yqd.googlegroups.com>
	<mailman.1333.1269985284.23598.python-list@python.org>
	<d2fd9d5f-e882-4e02-a569-6c9e39996c4d@k17g2000yqb.googlegroups.com>
Message-ID: <2010033114282721695-aptshansen@gmailinvalid>

On 2010-03-31 13:59:01 -0700, LX said:
>> pass_decorator will be called when the decorated function is _defined_,
>> but not when the decorated function is _called_.
> 
> Why is it then that during runtime, with a breakpoint in some
> arbitrary main() in main.py, I get something similar to the following
> call stack:
> 
> main.py, line xxx, in <module>
>  main()
> 
> <string>, line 2, in main
> 
> decorator.py, line 261, in pass_decorator
>  return f(*args, **kw)
> 
> main.py, line yyy, in main()
>  * breakpoint line here *
> 
> It looks to me the call stack still includes the additional level of
> the decorator... what am I missing? Thank you for your time.

You're not defining pass_decorator correctly. Always show us the actual 
code when you're showing results.

Your pass_decorator should just return the original function, 
undecorated, unmodified if you're not in debug. It should only return a 
decorated function otherwise.

Consider:

-----
from decorator import decorator

def debug_decorator(fn):
    if __debug__:
        def wrapper(fn, *args, **kwargs):
            # insert pre-condition testing here
            if len(args) != 1:
                raise ValueError("Incorrect number of arguments")

            result = fn(*args, **kwargs)

            # insert post-condition testing here
            if result not in (True, False):
                raise ValueError("Incorrect return value!")

            return result
        return decorator(wrapper, fn)
    else:
        return fn

@debug_decorator
def my_test(arg):
    if not arg:
        raise RuntimeError
    return True

my_test(0)
-----

And the output depending on if you're in debug mode or not:
Top:test ixokai$ python deco.py
Traceback (most recent call last):
  File "deco.py", line 27, in <module>
    my_test(0)
  File "<string>", line 2, in my_test
  File "deco.py", line 10, in wrapper
    result = fn(*args, **kwargs)
  File "deco.py", line 24, in my_test
    raise RuntimeError
RuntimeError

Top:test ixokai$ python -O deco.py
Traceback (most recent call last):
  File "deco.py", line 27, in <module>
    my_test(0)
  File "deco.py", line 24, in my_test
    raise RuntimeError
RuntimeError


-- 
--S

... p.s: change the ".invalid" to ".com" in email address to reply privately.



From clp2 at rebertia.com  Wed Mar 31 17:33:13 2010
From: clp2 at rebertia.com (Chris Rebert)
Date: Wed, 31 Mar 2010 14:33:13 -0700
Subject: subprocess only good for win32?
In-Reply-To: <353133a8-ff39-4b36-b96d-4836cea621bf@j41g2000vbe.googlegroups.com>
References: <353133a8-ff39-4b36-b96d-4836cea621bf@j41g2000vbe.googlegroups.com>
Message-ID: <w2w50697b2c1003311433va6e18011w675e980193925f0b@mail.gmail.com>

On Wed, Mar 31, 2010 at 2:26 PM, wukong <novacompute at gmail.com> wrote:
> subprocess works fine on my win pro 32-bit, but not on vista 64-bit.
> am i doing some wrong, or it just won't work for win64? ?If that's
> true, will it be extended to win64 in teh future?

Please characterize exactly how it is not working for you.
Include any error message and/or exception traceback.

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


From dreadpiratejeff at gmail.com  Wed Mar 31 17:37:10 2010
From: dreadpiratejeff at gmail.com (J)
Date: Wed, 31 Mar 2010 17:37:10 -0400
Subject: Get Eclipse/PyDev to run scripts that don't end in .py
Message-ID: <n2r36dec4ff1003311437q7e41ec94ke8f3dcef830c3d44@mail.gmail.com>

Is there any way to tell PyDev in Eclipse to run a script that doesn't
end in .py?  Even if I have to go and manually set something for each
file...

I've inherited (in a manner of speaking) a dev project that is done in
python2.6... I pulled the latest dev branch and have it opened as a
project in Eclipse, however, none of the python files end in .py, so
PyDev only sees them as text files.  And because of that, I can't run
them in Eclipse to try my changes, debug, etc.

So, is there a way to make them show up as python code without the .py
extension?  Because of this, I also don't get any of the fancy
indenting and highlighting that I'd normally get...

Cheers,

Jeff


From novacompute at gmail.com  Wed Mar 31 17:43:26 2010
From: novacompute at gmail.com (wukong)
Date: Wed, 31 Mar 2010 14:43:26 -0700 (PDT)
Subject: subprocess only good for win32?
References: <353133a8-ff39-4b36-b96d-4836cea621bf@j41g2000vbe.googlegroups.com>
	<mailman.1389.1270071195.23598.python-list@python.org>
Message-ID: <ad600ab4-40db-43d6-a63a-b8fa3746e0a3@v13g2000vbf.googlegroups.com>

On Mar 31, 2:33?pm, Chris Rebert <c... at rebertia.com> wrote:
> On Wed, Mar 31, 2010 at 2:26 PM, wukong <novacomp... at gmail.com> wrote:
> > subprocess works fine on my win pro 32-bit, but not on vista 64-bit.
> > am i doing some wrong, or it just won't work for win64? ?If that's
> > true, will it be extended to win64 in teh future?
>
> Please characterize exactly how it is not working for you.
> Include any error message and/or exception traceback.
>
> Cheers,
> Chris
> --http://blog.rebertia.com

thanks for checking in, here's the error msg.
"""
Traceback (most recent call last):
  File "C:/GUI/mainFunc.py", line 230, in OnSolve
    subprocess.call([filename])
  File "C:\Program Files (x86)\python26\lib\subprocess.py", line 470,
in call
    return Popen(*popenargs, **kwargs).wait()
  File "C:\Program Files (x86)\python26\lib\subprocess.py", line 621,
in __init__
    errread, errwrite)
  File "C:\Program Files (x86)\python26\lib\subprocess.py", line 830,
in _execute_child
    startupinfo)
WindowsError: [Error 14001] The application has failed to start
because its side-by-side configuration is incorrect. Please see the
application event log for more detail
"""

also subprocess.py clearly says
"""
import sys
mswindows = (sys.platform == "win32")
"""

thanks
wk


From tjreedy at udel.edu  Wed Mar 31 17:54:56 2010
From: tjreedy at udel.edu (Terry Reedy)
Date: Wed, 31 Mar 2010 17:54:56 -0400
Subject: subprocess only good for win32?
In-Reply-To: <353133a8-ff39-4b36-b96d-4836cea621bf@j41g2000vbe.googlegroups.com>
References: <353133a8-ff39-4b36-b96d-4836cea621bf@j41g2000vbe.googlegroups.com>
Message-ID: <hp0gbh$83v$1@dough.gmane.org>

On 3/31/2010 5:26 PM, wukong wrote:
> subprocess works fine on my win pro 32-bit, but not on vista 64-bit.

You are more likely to get a helpful answer if you give a minimal 
example and explain exactly what 'not [works fine]' means. What did 
happen? Include full error traceback if there was one.



From python at rcn.com  Wed Mar 31 18:42:34 2010
From: python at rcn.com (Raymond Hettinger)
Date: Wed, 31 Mar 2010 15:42:34 -0700 (PDT)
Subject: sorting ascending/descending with operator.attrgetter
References: <a8c7b02e-73d8-4ae2-a76a-e54a01bd22f5@b30g2000yqd.googlegroups.com>
Message-ID: <c1d24201-936c-4e8f-958f-66c821d07313@35g2000yqm.googlegroups.com>

On Mar 31, 10:08?am, Chris Curvey <ccur... at gmail.com> wrote:
> I must be having a brain cramp. ?Given a list of objects, how can I
> sort the list on one attribute in descending order, then sort within
> each group in ascending order on another attribute.
>
> For example:
>
> class Foo:
> ? ? def __init__(self, a, b, c):
> ? ? ? ? self.a = a
> ? ? ? ? self.b = b
> ? ? ? ? self.c = c
>
> I can do "allmyfoos.sort(operator.attrgetter('a','b'))" to sort
> ascending on both attributes, but how could i sort by "a, descending,
> then b, ascending)?"

Rely on sort stability and do two passes:

   allmyfoos.sort(operator.attrgetter('b'))
   allmyfoos.sort(operator.attrgetter('a'), reverse=True)


Raymond


From martin at v.loewis.de  Wed Mar 31 18:47:18 2010
From: martin at v.loewis.de (Martin v. Loewis)
Date: Thu, 01 Apr 2010 00:47:18 +0200
Subject: subprocess only good for win32?
In-Reply-To: <ad600ab4-40db-43d6-a63a-b8fa3746e0a3@v13g2000vbf.googlegroups.com>
References: <353133a8-ff39-4b36-b96d-4836cea621bf@j41g2000vbe.googlegroups.com>
	<mailman.1389.1270071195.23598.python-list@python.org>
	<ad600ab4-40db-43d6-a63a-b8fa3746e0a3@v13g2000vbf.googlegroups.com>
Message-ID: <4BB3D0F6.2010906@v.loewis.de>

> WindowsError: [Error 14001] The application has failed to start
> because its side-by-side configuration is incorrect. Please see the
> application event log for more detail

This is a configuration error on your system. The application you are
trying to start is incorrectly installed - it's not only that Python
can't start it, but nobody can.

Regards,
Martin


From abrahamalrajhi at gmail.com  Wed Mar 31 18:48:07 2010
From: abrahamalrajhi at gmail.com (Abethebabe)
Date: Wed, 31 Mar 2010 15:48:07 -0700 (PDT)
Subject: Getting a Python program to run of off a flash drive?
Message-ID: <d40a9679-1054-41b9-8f05-45165ee14f25@l36g2000yqb.googlegroups.com>

I wanted to know if there was a way I could get a Python program to
run off of my flash drive as soon as the computer (Windows) detected
the device?

For example I could have a a simple program that would create a text
document on the computers desktop when my flash drive is detected.


From steve at REMOVE-THIS-cybersource.com.au  Wed Mar 31 18:53:51 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 31 Mar 2010 22:53:51 GMT
Subject: decorators only when __debug__ == True
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>
	<mailman.1295.1269912866.23598.python-list@python.org>
	<7778821c-84f3-4829-8e05-85134c5d6c5b@y17g2000yqd.googlegroups.com>
	<mailman.1333.1269985284.23598.python-list@python.org>
	<d2fd9d5f-e882-4e02-a569-6c9e39996c4d@k17g2000yqb.googlegroups.com>
	<mailman.1388.1270070831.23598.python-list@python.org>
Message-ID: <4bb3d27f$0$8827$c3e8da3@news.astraweb.com>

On Wed, 31 Mar 2010 22:27:05 +0100, MRAB wrote:

> LX wrote:
[...]
>> It looks to me the call stack still includes the additional level of
>> the decorator... what am I missing? Thank you for your time.
> 
> Are you still defining your decorators in the same way as in your
> original post?
> 
> A decorator shouldn't call the function it's decorating.

*raises eyebrow*

Surely, in the general case, a decorator SHOULD call the function it is 
decorating? I'm sure you know that, but your wording is funny and could 
confuse the OP.

In this specific case, where the OP wants a "do nothing pass-decorator", 
he should do this:

def decorator(func):
    if __debug__:
        ...
    else:
        return func

rather than this:

def decorator(func):
    if __debug__:
        ...
    else:
        def inner(*args):
            return func(*args)
        return inner



-- 
Steven


From steve at REMOVE-THIS-cybersource.com.au  Wed Mar 31 18:57:10 2010
From: steve at REMOVE-THIS-cybersource.com.au (Steven D'Aprano)
Date: 31 Mar 2010 22:57:10 GMT
Subject: sorting ascending/descending with operator.attrgetter
References: <a8c7b02e-73d8-4ae2-a76a-e54a01bd22f5@b30g2000yqd.googlegroups.com>
	<96712ef1-5c10-455b-904c-c2436736c9d2@35g2000yqm.googlegroups.com>
Message-ID: <4bb3d346$0$8827$c3e8da3@news.astraweb.com>

On Wed, 31 Mar 2010 12:05:24 -0700, Patrick Maupin wrote:

> You can provide a cmp function to the string sort method, e.g. cmp =
> lambda x,y: -cmp(x.a, y.a) or cmp(x.b, y.b)

String sort method?

>>> ''.sort
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'str' object has no attribute 'sort'
>>> import string
>>> string.sort
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'sort'

Did you mean list sort method?



> You can also possibly gain some efficiency by using key instead of cmp.

That is an impressive understatement. key is called once for every item, 
cmp is called once for every comparison. cmp has been dropped from Python 
3.x because its performance is poor.



-- 
Steven


From rantingrick at gmail.com  Wed Mar 31 19:00:46 2010
From: rantingrick at gmail.com (rantingrick)
Date: Wed, 31 Mar 2010 16:00:46 -0700 (PDT)
Subject: Getting a Python program to run of off a flash drive?
References: <d40a9679-1054-41b9-8f05-45165ee14f25@l36g2000yqb.googlegroups.com>
Message-ID: <19123497-50f6-4234-bf99-6550f35324a4@o30g2000yqb.googlegroups.com>

On Mar 31, 5:48?pm, Abethebabe <abrahamalra... at gmail.com> wrote:
> I wanted to know if there was a way I could get a Python program to
> run off of my flash drive as soon as the computer (Windows) detected
> the device?
>
> For example I could have a a simple program that would create a text
> document on the computers desktop when my flash drive is detected.

Well i sure hope your intentions are for the forces of good and NOT
the forces of evil. Anyway the beauty of USB is the fact you can read
and write to it just like any other file on your harddisc, unlike with
CD media where you need a CS degree and MS's blessing. So now the
question really is

""" How do i run a python script when i plug in my flash drive"""?

And thats a good question. Well it's going to involve "something"
watching and waiting for this (big hint) "event" to happen. Maybe
something like a "Flash Drive plug in watcher sevice" Do you have any
experience with win32 programming?


From alfps at start.no  Wed Mar 31 19:04:39 2010
From: alfps at start.no (Alf P. Steinbach)
Date: Thu, 01 Apr 2010 01:04:39 +0200
Subject: Getting a Python program to run of off a flash drive?
In-Reply-To: <d40a9679-1054-41b9-8f05-45165ee14f25@l36g2000yqb.googlegroups.com>
References: <d40a9679-1054-41b9-8f05-45165ee14f25@l36g2000yqb.googlegroups.com>
Message-ID: <hp0ki2$env$1@news.eternal-september.org>

* Abethebabe:
> I wanted to know if there was a way I could get a Python program to
> run off of my flash drive as soon as the computer (Windows) detected
> the device?
> 
> For example I could have a a simple program that would create a text
> document on the computers desktop when my flash drive is detected.

As long as its your own computer, no problem.

However, in the war between the corporate "we own your computer" and the 
individual's "I think the computer's mine" (so eloquently expressed as the main 
goal of the 70's Smalltalk project, to bring effective computing to the masses) 
the arms race is currently stuck at a point where any computer-literate person 
running Windows turns off the various run-automatically features as soon as 
they're sneak-introduced by Windows service packs and IE updates and whatever. I 
don't know, but I think there are six or seven such schemes. Happily, as far as 
I know they can all be turned off. If not for this then the recording industry 
could have sued a lot of people in Norway. But our laws require copy protection 
schemes to be effective, and a scheme based on a feature that most intelligent 
persons have turned off isn't effective, so wrt. law it's like it's not there.

I think it was EMI who once distributed a nasty rootkit (and yes, it was theirs, 
it was not an accident) as a copy protection scheme on a music CD. Getting a lot 
of bad publicity for that they and other record companies didn't back off but 
continued with just less malware-like auto run protection. I was perplexed when 
I learned that one CD with Madrugada, that I'd copied to my hard disk, was 
supposedly protected this way. Sure enough, there was this sticker on it. 
However, since the idiot scheme they used was based on auto-run I never noticed.


Cheers,

- Alf


From python at mrabarnett.plus.com  Wed Mar 31 19:27:51 2010
From: python at mrabarnett.plus.com (MRAB)
Date: Thu, 01 Apr 2010 00:27:51 +0100
Subject: decorators only when __debug__ == True
In-Reply-To: <4bb3d27f$0$8827$c3e8da3@news.astraweb.com>
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>	<mailman.1295.1269912866.23598.python-list@python.org>	<7778821c-84f3-4829-8e05-85134c5d6c5b@y17g2000yqd.googlegroups.com>	<mailman.1333.1269985284.23598.python-list@python.org>	<d2fd9d5f-e882-4e02-a569-6c9e39996c4d@k17g2000yqb.googlegroups.com>	<mailman.1388.1270070831.23598.python-list@python.org>
	<4bb3d27f$0$8827$c3e8da3@news.astraweb.com>
Message-ID: <4BB3DA77.1040302@mrabarnett.plus.com>

Steven D'Aprano wrote:
> On Wed, 31 Mar 2010 22:27:05 +0100, MRAB wrote:
> 
>> LX wrote:
> [...]
>>> It looks to me the call stack still includes the additional level of
>>> the decorator... what am I missing? Thank you for your time.
>> Are you still defining your decorators in the same way as in your
>> original post?
>>
>> A decorator shouldn't call the function it's decorating.
> 
> *raises eyebrow*
> 
> Surely, in the general case, a decorator SHOULD call the function it is 
> decorating? I'm sure you know that, but your wording is funny and could 
> confuse the OP.
> 
What I mean is that the function that's doing the decorating shouldn't
call the function; it's the locally-defined wrapper function that calls
the decorated function.

For example, in my version of trace_decorator() it's show() that calls
the decorated function, not trace_decorator() itself.

Unless the word 'decorator' refers to the locally-defined function, in
which case, what do you call the function that does the wrapping, the
one whose name follows the '@'?

> In this specific case, where the OP wants a "do nothing pass-decorator", 
> he should do this:
> 
> def decorator(func):
>     if __debug__:
>         ...
>     else:
>         return func
> 
> rather than this:
> 
> def decorator(func):
>     if __debug__:
>         ...
>     else:
>         def inner(*args):
>             return func(*args)
>         return inner
> 
> 
> 



From lxkain at gmail.com  Wed Mar 31 20:01:05 2010
From: lxkain at gmail.com (LX)
Date: Wed, 31 Mar 2010 17:01:05 -0700 (PDT)
Subject: decorators only when __debug__ == True
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>
	<mailman.1295.1269912866.23598.python-list@python.org>
	<7778821c-84f3-4829-8e05-85134c5d6c5b@y17g2000yqd.googlegroups.com>
	<mailman.1333.1269985284.23598.python-list@python.org>
	<d2fd9d5f-e882-4e02-a569-6c9e39996c4d@k17g2000yqb.googlegroups.com>
	<2010033114282721695-aptshansen@gmailinvalid>
Message-ID: <241036ac-23c9-4f2c-8619-69fbba5f300e@30g2000yqi.googlegroups.com>

On Mar 31, 2:28?pm, Stephen Hansen <apt.shan... at gmail.invalid> wrote:
> On 2010-03-31 13:59:01 -0700, LX said:
>
>
>
>
>
> >> pass_decorator will be called when the decorated function is _defined_,
> >> but not when the decorated function is _called_.
>
> > Why is it then that during runtime, with a breakpoint in some
> > arbitrary main() in main.py, I get something similar to the following
> > call stack:
>
> > main.py, line xxx, in <module>
> > ?main()
>
> > <string>, line 2, in main
>
> >decorator.py, line 261, in pass_decorator
> > ?return f(*args, **kw)
>
> > main.py, line yyy, in main()
> > ?* breakpoint line here *
>
> > It looks to me the call stack still includes the additional level of
> > thedecorator... what am I missing? Thank you for your time.
>
> You're not defining pass_decorator correctly. Always show us the actual
> code when you're showing results.
>
> Your pass_decorator should just return the original function,
> undecorated, unmodified if you're not in debug. It should only return a
> decorated function otherwise.
>
> Consider:
>
> -----
> fromdecoratorimportdecorator
>
> def debug_decorator(fn):
> ? ? if __debug__:
> ? ? ? ? def wrapper(fn, *args, **kwargs):
> ? ? ? ? ? ? # insert pre-condition testing here
> ? ? ? ? ? ? if len(args) != 1:
> ? ? ? ? ? ? ? ? raise ValueError("Incorrect number of arguments")
>
> ? ? ? ? ? ? result = fn(*args, **kwargs)
>
> ? ? ? ? ? ? # insert post-condition testing here
> ? ? ? ? ? ? if result not in (True, False):
> ? ? ? ? ? ? ? ? raise ValueError("Incorrect return value!")
>
> ? ? ? ? ? ? return result
> ? ? ? ? returndecorator(wrapper, fn)
> ? ? else:
> ? ? ? ? return fn
>
> @debug_decorator
> def my_test(arg):
> ? ? if not arg:
> ? ? ? ? raise RuntimeError
> ? ? return True
>
> my_test(0)
> -----
>
> And the output depending on if you're in debug mode or not:
> Top:test ixokai$ python deco.py
> Traceback (most recent call last):
> ? File "deco.py", line 27, in <module>
> ? ? my_test(0)
> ? File "<string>", line 2, in my_test
> ? File "deco.py", line 10, in wrapper
> ? ? result = fn(*args, **kwargs)
> ? File "deco.py", line 24, in my_test
> ? ? raise RuntimeError
> RuntimeError
>
> Top:test ixokai$ python -O deco.py
> Traceback (most recent call last):
> ? File "deco.py", line 27, in <module>
> ? ? my_test(0)
> ? File "deco.py", line 24, in my_test
> ? ? raise RuntimeError
> RuntimeError
>
> --
> --S
>
> ... p.s: change the ".invalid" to ".com" in email address to reply privately.

Thank you all a lot! The last 3 posts helped me figure it out. Indeed,
my pass_decorator function used "@decorator", using the decoratory.py
library. This prevented return of the original function. The code that
I have now is:

#NOT THIS:
#@decorator
#def pass_decorator(f, *args, **kw): # what about the slow-down that
incurs when using pass_decorator
    #return f(*args, **kw)

def pass_decorator(f):
    return f

@decorator
def trace_decorator(f, *args, **kw):
    print "calling %s with args %s, %s" % (f.func_name, args, kw)
    return f(*args, **kw)

trace_enable_flag = False #__debug__
trace = trace_decorator if trace_enable_flag else pass_decorator


From pmaupin at gmail.com  Wed Mar 31 20:21:18 2010
From: pmaupin at gmail.com (Patrick Maupin)
Date: Wed, 31 Mar 2010 17:21:18 -0700 (PDT)
Subject: sorting ascending/descending with operator.attrgetter
References: <a8c7b02e-73d8-4ae2-a76a-e54a01bd22f5@b30g2000yqd.googlegroups.com>
	<96712ef1-5c10-455b-904c-c2436736c9d2@35g2000yqm.googlegroups.com> 
	<4bb3d346$0$8827$c3e8da3@news.astraweb.com>
Message-ID: <bb4655b5-694f-4c2c-b681-996fd1cc5df7@z6g2000yqz.googlegroups.com>

On Mar 31, 5:57?pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:

> Did you mean list sort method?

Why, yes.  Yes, I did.  Yes, I'm an old forgetful man who sometimes
misspeaks or mistypes, and you're the smartest, sharpest guy in the
world.  Most helpful, too. It's much more useful to show how I'm wrong
than to provide useful info to the OP.  Teaches people not to quickly
post on CLP to try to help out people with immediate problems.  No, it
would have been much more useful for me to self-edit my post for a
couple of days before posting.

Doesn't matter though.  The OP was sorting lists, not strings, so he
knew what I meant.

> > You can also possibly gain some efficiency by using key instead of cmp.
>
> That is an impressive understatement. key is called once for every item,
> cmp is called once for every comparison. cmp has been dropped from Python
> 3.x because its performance is poor.

Yes, well, I did have the "Use a key" statement before "use
cmp" (before I did the tiny bit of editing I did before posting) and
then it occurred to me that he might be sorting with strings, so I
thought I would give him something that worked, and then something
that might work better under some circumstances.

And, BTW, if he is only occasionally
sorting a few short strings^H^H^H^H^H^H^Hlists,
he'll never notice a performance difference.  But at least you can
take comfort that he now knows how superior your intellect is to mine.

Of course, he might accidentally underestimate Peter and Raymond's
intellect.  They published dual sort solutions that are, for most
cases, probably better than the single sort solution I published, but
neglected to call attention to just how bad my suggestion was.


From abrahamalrajhi at gmail.com  Wed Mar 31 20:32:33 2010
From: abrahamalrajhi at gmail.com (Abethebabe)
Date: Wed, 31 Mar 2010 17:32:33 -0700 (PDT)
Subject: Getting a Python program to run of off a flash drive?
References: <d40a9679-1054-41b9-8f05-45165ee14f25@l36g2000yqb.googlegroups.com>
	<19123497-50f6-4234-bf99-6550f35324a4@o30g2000yqb.googlegroups.com>
Message-ID: <11ac4094-655e-4474-98c8-fa8829d4f56f@z3g2000yqz.googlegroups.com>

On Mar 31, 7:00?pm, rantingrick <rantingr... at gmail.com> wrote:
> On Mar 31, 5:48?pm, Abethebabe <abrahamalra... at gmail.com> wrote:
>
> > I wanted to know if there was a way I could get a Python program to
> > run off of my flash drive as soon as the computer (Windows) detected
> > the device?
>
> > For example I could have a a simple program that would create a text
> > document on the computers desktop when my flash drive is detected.
>
> Well i sure hope your intentions are for the forces of good and NOT
> the forces of evil. Anyway the beauty of USB is the fact you can read
> and write to it just like any other file on your harddisc, unlike with
> CD media where you need a CS degree and MS's blessing. So now the
> question really is
>
> """ How do i run a python script when i plug in my flash drive"""?
>
> And thats a good question. Well it's going to involve "something"
> watching and waiting for this (big hint) "event" to happen. Maybe
> something like a "Flash Drive plug in watcher sevice" Do you have any
> experience with win32 programming?

I'm a web programmer and python is my first delve into desktop
programming. I had a rough guesstimation that I'd need to maybe use
wxpython with an API for the flash drive (wasn't sure if hardware had
this, I guess it would be the drivers?)

So do you think wxPython would have the answer I'm looking for? Thanks
for your reply btw


From abrahamalrajhi at gmail.com  Wed Mar 31 20:33:49 2010
From: abrahamalrajhi at gmail.com (Abethebabe)
Date: Wed, 31 Mar 2010 17:33:49 -0700 (PDT)
Subject: Getting a Python program to run of off a flash drive?
References: <d40a9679-1054-41b9-8f05-45165ee14f25@l36g2000yqb.googlegroups.com>
	<hp0ki2$env$1@news.eternal-september.org>
Message-ID: <c38f9f5f-a989-4f11-b20f-c97b92154d6a@u22g2000yqf.googlegroups.com>

On Mar 31, 7:04?pm, "Alf P. Steinbach" <al... at start.no> wrote:
> * Abethebabe:
>
> > I wanted to know if there was a way I could get a Python program to
> > run off of my flash drive as soon as the computer (Windows) detected
> > the device?
>
> > For example I could have a a simple program that would create a text
> > document on the computers desktop when my flash drive is detected.
>
> As long as its your own computer, no problem.
>
> However, in the war between the corporate "we own your computer" and the
> individual's "I think the computer's mine" (so eloquently expressed as the main
> goal of the 70's Smalltalk project, to bring effective computing to the masses)
> the arms race is currently stuck at a point where any computer-literate person
> running Windows turns off the various run-automatically features as soon as
> they're sneak-introduced by Windows service packs and IE updates and whatever. I
> don't know, but I think there are six or seven such schemes. Happily, as far as
> I know they can all be turned off. If not for this then the recording industry
> could have sued a lot of people in Norway. But our laws require copy protection
> schemes to be effective, and a scheme based on a feature that most intelligent
> persons have turned off isn't effective, so wrt. law it's like it's not there.
>
> I think it was EMI who once distributed a nasty rootkit (and yes, it was theirs,
> it was not an accident) as a copy protection scheme on a music CD. Getting a lot
> of bad publicity for that they and other record companies didn't back off but
> continued with just less malware-like auto run protection. I was perplexed when
> I learned that one CD with Madrugada, that I'd copied to my hard disk, was
> supposedly protected this way. Sure enough, there was this sticker on it.
> However, since the idiot scheme they used was based on auto-run I never noticed.
>
> Cheers,
>
> - Alf

Interesting, so every new computer I'd use it on I would need to
disable these filters? If I could just disable them on my computer
though I'd be happy enough.


From keith at nekotaku.com  Wed Mar 31 20:38:46 2010
From: keith at nekotaku.com (KB)
Date: Wed, 31 Mar 2010 17:38:46 -0700 (PDT)
Subject: CGI templating with python
Message-ID: <d085d2a4-7b63-4592-a20e-2703a2d4a7f0@10g2000yqq.googlegroups.com>

Hi there,

Years ago I wrote a LAMP app using python. I find I need a simple web
data entry tool to store records (stock research) and when I enter a
stock ticker, to pull up all the past research I have done. I am
imagining fields like ticker, date, pulldown menus for various
options, long text for comments etc..

It's a very light weight application, so I was wondering if using
something like Cheetah is the best way to do this?

Or should I research Zope further or are there any other suggestions?

Environment:
- Python 2.5 (w/ MySQLdb)
- MySQL 5.1
- Windows Vista

Many thanks in advance!


From martin.hellwig at dcuktec.org  Wed Mar 31 21:13:57 2010
From: martin.hellwig at dcuktec.org (Martin P. Hellwig)
Date: Thu, 01 Apr 2010 02:13:57 +0100
Subject: Get Eclipse/PyDev to run scripts that don't end in .py
In-Reply-To: <mailman.1390.1270071456.23598.python-list@python.org>
References: <mailman.1390.1270071456.23598.python-list@python.org>
Message-ID: <hp0s0g$mfk$1@news.eternal-september.org>

On 03/31/10 22:37, J wrote:
> Is there any way to tell PyDev in Eclipse to run a script that doesn't
> end in .py?  Even if I have to go and manually set something for each
> file...
>
> I've inherited (in a manner of speaking) a dev project that is done in
> python2.6... I pulled the latest dev branch and have it opened as a
> project in Eclipse, however, none of the python files end in .py, so
> PyDev only sees them as text files.  And because of that, I can't run
> them in Eclipse to try my changes, debug, etc.
>
> So, is there a way to make them show up as python code without the .py
> extension?  Because of this, I also don't get any of the fancy
> indenting and highlighting that I'd normally get...
>
> Cheers,
>
> Jeff

You probably need to do that one level higher, i.e. in Eclipse (hint: 
Preferences>General>Editors>File Associations <don't forget to also add 
a 'Associated editors' for your new defined file type>).

I do have a couple of remarks though.

It sounds to me like you inherited something of more or less a 'shipped' 
product. Perhaps it would be wise to invest some time to restructure the 
project so that it works nicely with all the tools you have (unit 
testing, coverage, refactoring, etc.) and build a script that from your 
source builds the actually release (resembling that what you have 
inherited).

<whining_mode status='on'>
This question would probably have been more suitable in 
http://sourceforge.net/projects/pydev/forums/forum/293649 (that is the 
PyDev forum), and it is likely that they would have sent you through to 
http://www.eclipse.org/forums/ .
</whining_mode>

-- 
mph





From fabiofz at gmail.com  Wed Mar 31 21:17:09 2010
From: fabiofz at gmail.com (Fabio Zadrozny)
Date: Wed, 31 Mar 2010 22:17:09 -0300
Subject: Get Eclipse/PyDev to run scripts that don't end in .py
In-Reply-To: <n2r36dec4ff1003311437q7e41ec94ke8f3dcef830c3d44@mail.gmail.com>
References: <n2r36dec4ff1003311437q7e41ec94ke8f3dcef830c3d44@mail.gmail.com>
Message-ID: <u2ucfb578b21003311817jdb9913c9s7c7b234ffe43b1c3@mail.gmail.com>

On Wed, Mar 31, 2010 at 6:37 PM, J <dreadpiratejeff at gmail.com> wrote:
> Is there any way to tell PyDev in Eclipse to run a script that doesn't
> end in .py? ?Even if I have to go and manually set something for each
> file...
>
> I've inherited (in a manner of speaking) a dev project that is done in
> python2.6... I pulled the latest dev branch and have it opened as a
> project in Eclipse, however, none of the python files end in .py, so
> PyDev only sees them as text files. ?And because of that, I can't run
> them in Eclipse to try my changes, debug, etc.
>
> So, is there a way to make them show up as python code without the .py
> extension? ?Because of this, I also don't get any of the fancy
> indenting and highlighting that I'd normally get...


You have to change it in 2 places:

1. window > preferences > general > editors > file associations: add
the *.extension and bind it to the Python Editor (see how the *.py
association is done).

2. window > preferences > Pydev > editor > code style > file types:
add your custom extension there (and you may want to change the
default python extension if you'll keep creating modules with that
different extension).

Cheers,

Fabio


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 31 21:30:21 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 01 Apr 2010 01:30:21 GMT
Subject: decorators only when __debug__ == True
References: <d4234e4c-c359-45f0-9035-a70cdb16b0a7@f13g2000pra.googlegroups.com>
	<mailman.1295.1269912866.23598.python-list@python.org>
	<7778821c-84f3-4829-8e05-85134c5d6c5b@y17g2000yqd.googlegroups.com>
	<mailman.1333.1269985284.23598.python-list@python.org>
	<d2fd9d5f-e882-4e02-a569-6c9e39996c4d@k17g2000yqb.googlegroups.com>
	<mailman.1388.1270070831.23598.python-list@python.org>
	<4bb3d27f$0$8827$c3e8da3@news.astraweb.com>
	<mailman.1392.1270078078.23598.python-list@python.org>
Message-ID: <pan.2010.04.01.01.30.21@REMOVE.THIS.cybersource.com.au>

On Thu, 01 Apr 2010 00:27:51 +0100, MRAB wrote:

>>> A decorator shouldn't call the function it's decorating.
>> 
>> *raises eyebrow*
>> 
>> Surely, in the general case, a decorator SHOULD call the function it is
>> decorating? I'm sure you know that, but your wording is funny and could
>> confuse the OP.
>> 
> What I mean is that the function that's doing the decorating shouldn't
> call the function; it's the locally-defined wrapper function that calls
> the decorated function.

Ah, gotcha, that makes sense. Now I understand the distinction you were 
making. Thank you for the clarification.



-- 
Steven


From steven at REMOVE.THIS.cybersource.com.au  Wed Mar 31 21:34:36 2010
From: steven at REMOVE.THIS.cybersource.com.au (Steven D'Aprano)
Date: 01 Apr 2010 01:34:36 GMT
Subject: sorting ascending/descending with operator.attrgetter
References: <a8c7b02e-73d8-4ae2-a76a-e54a01bd22f5@b30g2000yqd.googlegroups.com>
	<96712ef1-5c10-455b-904c-c2436736c9d2@35g2000yqm.googlegroups.com>
	<4bb3d346$0$8827$c3e8da3@news.astraweb.com>
	<bb4655b5-694f-4c2c-b681-996fd1cc5df7@z6g2000yqz.googlegroups.com>
Message-ID: <pan.2010.04.01.01.34.36@REMOVE.THIS.cybersource.com.au>

On Wed, 31 Mar 2010 17:21:18 -0700, Patrick Maupin wrote:

> Doesn't matter though.  The OP was sorting lists, not strings, so he
> knew what I meant.

I have found that when people ask basic questions about fundamental 
Python operations like sorting, it is risky to assume that they will know 
what I meant if I say something different.

Since I've been on both the giving and receiving end of carelessly 
inaccurate answers, I know how frustrating it is to spend significant 
time trying to work out what I was doing wrong, only to be told much 
later "Oh, I meant you should do Y, not X. I thought you would understand 
what I meant."



-- 
Steven


From steve at holdenweb.com  Wed Mar 31 22:19:27 2010
From: steve at holdenweb.com (Steve Holden)
Date: Wed, 31 Mar 2010 22:19:27 -0400
Subject: sorting ascending/descending with operator.attrgetter
In-Reply-To: <pan.2010.04.01.01.34.36@REMOVE.THIS.cybersource.com.au>
References: <a8c7b02e-73d8-4ae2-a76a-e54a01bd22f5@b30g2000yqd.googlegroups.com>	<96712ef1-5c10-455b-904c-c2436736c9d2@35g2000yqm.googlegroups.com>	<4bb3d346$0$8827$c3e8da3@news.astraweb.com>	<bb4655b5-694f-4c2c-b681-996fd1cc5df7@z6g2000yqz.googlegroups.com>
	<pan.2010.04.01.01.34.36@REMOVE.THIS.cybersource.com.au>
Message-ID: <hp0vrp$gsr$1@dough.gmane.org>

Steven D'Aprano wrote:
> On Wed, 31 Mar 2010 17:21:18 -0700, Patrick Maupin wrote:
> 
>> Doesn't matter though.  The OP was sorting lists, not strings, so he
>> knew what I meant.
> 
> I have found that when people ask basic questions about fundamental 
> Python operations like sorting, it is risky to assume that they will know 
> what I meant if I say something different.
> 
> Since I've been on both the giving and receiving end of carelessly 
> inaccurate answers, I know how frustrating it is to spend significant 
> time trying to work out what I was doing wrong, only to be told much 
> later "Oh, I meant you should do Y, not X. I thought you would understand 
> what I meant."
> 
But you surely will admit that you could be held to, well rather than
"be pedantic" perhaps we should say "tend towards the literal"?

I'm the same myself, and I know from personal experience that while I am
(simply?) seeking accuracy and truth it sometimes bugs the hell out of
people ...

It's a geek thing.

regards
 Steve
-- 
Steve Holden           +1 571 484 6266   +1 800 494 3119
See PyCon Talks from Atlanta 2010  http://pycon.blip.tv/
Holden Web LLC                 http://www.holdenweb.com/
UPCOMING EVENTS:        http://holdenweb.eventbrite.com/



From robert.kern at gmail.com  Wed Mar 31 22:46:54 2010
From: robert.kern at gmail.com (Robert Kern)
Date: Wed, 31 Mar 2010 21:46:54 -0500
Subject: CGI templating with python
In-Reply-To: <d085d2a4-7b63-4592-a20e-2703a2d4a7f0@10g2000yqq.googlegroups.com>
References: <d085d2a4-7b63-4592-a20e-2703a2d4a7f0@10g2000yqq.googlegroups.com>
Message-ID: <hp11ft$k8u$1@dough.gmane.org>

On 2010-03-31 19:38 , KB wrote:
> Hi there,
>
> Years ago I wrote a LAMP app using python. I find I need a simple web
> data entry tool to store records (stock research) and when I enter a
> stock ticker, to pull up all the past research I have done. I am
> imagining fields like ticker, date, pulldown menus for various
> options, long text for comments etc..
>
> It's a very light weight application, so I was wondering if using
> something like Cheetah is the best way to do this?
>
> Or should I research Zope further or are there any other suggestions?

Django will probably get you where you want to go the fastest:

   http://www.djangoproject.com/

In particular, its admin interface will probably automatically generate a usable 
UI for you without your having to write many templates at all.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco



From aahz at pythoncraft.com  Wed Mar 31 23:33:35 2010
From: aahz at pythoncraft.com (Aahz)
Date: 31 Mar 2010 20:33:35 -0700
Subject: Getting a Python program to run of off a flash drive?
References: <d40a9679-1054-41b9-8f05-45165ee14f25@l36g2000yqb.googlegroups.com>
	<hp0ki2$env$1@news.eternal-september.org>
Message-ID: <hp146f$cd7$1@panix5.panix.com>

In article <hp0ki2$env$1 at news.eternal-september.org>,
Alf P. Steinbach <alfps at start.no> wrote:
>
>I think it was EMI who once distributed a nasty rootkit (and yes, it   
>was theirs, it was not an accident) as a copy protection scheme on a   
>music CD.                                                              

Sony, and I still (mostly) boycott Sony.  (I buy no Sony hardware, but
because Sony owns a movie studio, it's a little more difficult to boycott
Sony DVDs.)
-- 
Aahz (aahz at pythoncraft.com)           <*>         http://www.pythoncraft.com/

Why is this newsgroup different from all other newsgroups?  


From ded.utility at gmail.com  Wed Mar 31 23:36:56 2010
From: ded.utility at gmail.com (d d)
Date: Wed, 31 Mar 2010 23:36:56 -0400
Subject: how to build with --enable-shared so that binary knows where 
	libraries are.
Message-ID: <g2j9934b3321003312036q7c4eb489i8d4d9946448675d3@mail.gmail.com>

The following is on Linux.

I'd like to build python with ./configure --enable-shared.  And
install in a non-standard place (an nfs-mounted directory).

However, the binary is then not usable, since it can't find the
library.  I can fix this by defining LD_LIBRARY_PATH, but I don't want
to do that.  Doing anything system-specific is impractical, since many
systems will point to this directory (LD_LIBRARY_PATH is feasible,
though undesired, because it can be set in a common script that users
call from their .cshrc files.)

Is there a way to configure the build such that the binary will know
where the shared library is?

I found this:
http://koansys.com/tech/building-python-with-enable-shared-in-non-standard-location
It recommends LDFLAGS="-rpath <path to lib>", and mentions that you
get a "compiler cannot create executables" error unless you first
create the empty directory.  But I get that error even when I do
create the empty directory.

Any help would be appreciated.

--Dan


From rantingrick at gmail.com  Wed Mar 31 23:53:08 2010
From: rantingrick at gmail.com (rantingrick)
Date: Wed, 31 Mar 2010 20:53:08 -0700 (PDT)
Subject: Python + OpenOffice Calc
References: <4bb2fe14$0$1120$4fafbaef@reader3.news.tin.it>
Message-ID: <a4155d52-b57c-47e2-aae8-0a5bcbb53a1e@z4g2000yqa.googlegroups.com>

On Mar 31, 2:47?am, Tracubik <affdfsdfds... at b.com> wrote:
> Hi all!
> i'm giving away to a friend of mine that have a garage (he repair car) my
> old computer. He will use it essentialy to create estimates of the work
> via an ods file (i've made a simple ods file to be filled with the cost of
> materials and a description of the work).
> He's totally new with computer and have difficult to fill the ods file, so
> i'ld like to create a simple python program that help him to introduce the
> data in to the ods file via a simple gui.
> So what i'm looking for is a way in python to insert data in a particular
> cell of the ods file and possibly to save it and print it when it's full
> filled with data.
>
> the guy is similar to this:
>
> 3 fields: quantity - description of the piece bought - price


So what is your plan...?
  * Pop up a dialog with three entrys,
  * have him fill out the three entrys,
  * then have python insert the data into the spreadsheet?
...Why bother messing with OO, too much trouble for me?

If the guy is that scared of spreadsheets I would skip the spreadsheet
all together and just use a Tk.Listbox to display the data. Create a
big button at the bottom (preferably in Times 20 red font) that says
"NEW INPUT" and let him edit lines by double clicking on them. You
need a good Scrolled Listbox with a nice interface, an entry dialog,
and some file IO with backup protection. Thats about it.

I would probably create a new file every day, week, or month depending
on the amount of data he enters daily, you don't want to load enormous
files into a Tk.Listbox. Then just save all the data as csv and you
can always load it into a spreadsheet later if the IRS comes knocking,
or you need to print a professional looking spreadsheet ;-).  Simple,
100% python solution!

If you want to do this and need help i would be happy to offer my
assistance. This would be a "fairly" simple script and great learning
experience for you.