ANN: pydf 9
pydf displays the amount of used and available space on your filesystems, just like df, but in colours. The output format is completely customizable. Pydf was written and works on Linux, but should work also on other modern UNIX systems (including MacOSX). URL: http://kassiopeia.juls.savba.sk/~garabik/software/pydf/ License: public domain Changes since the last version: * remove stray ANSI escape sequence when using --bw mode * convert to run with python3 (thanks to Dror Levin), while python2 remains supported. -- --- | Radovan Garabík http://kassiopeia.juls.savba.sk/~garabik/ | | __..--^^^--..__garabik @ kassiopeia.juls.savba.sk | --- Antivirus alert: file .signature infected by signature virus. Hi! I'm a signature virus! Copy me into your signature file to help me spread! -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
[ANN] Greenlet 0.3.1 released
Announcing the release of greenlet 0.3.1: http://pypi.python.org/pypi/greenlet/0.3.1 0.3.1 is a bugfix release that fixes a critical reference leak bug. The 0.3 release introduced support for passing keyword arguments to the switch method. There was an edge case where an empty keyword argument dictionary would not have its reference count decremented, which would cause a memory leak. Thanks to Marcin Bachry for reporting the bug and providing a patch. What is Greenlet? - The greenlet package is a spin-off of Stackless, a version of CPython that supports micro-threads called tasklets. Tasklets run pseudo-concurrently (typically in a single or a few OS-level threads) and are synchronized with data exchanges on channels. A greenlet, on the other hand, is a still more primitive notion of micro-thread with no implicit scheduling; coroutines, in other words. greenlet is used by several non-blocking IO packages as a more flexible alternative to Python's built in coroutines. * concurrence * eventlet * gevent Links - Mercurial repository: http://bitbucket.org/ambroff/greenlet Documentation: http://packages.python.org/greenlet/ -Kyle Ambroff -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
Grease 0.2 Released
Grease is a pluggable and highly extensible 2D game engine and framework for Python. The intent of this project is to provide a fresh approach to Python game development. The component-based architecture allows games to be constructed bit by bit with built-in separation of concerns. The engine acknowledges that all game projects are unique and have different requirements. Thus Grease does not attempt to provide one-size-fits-all solutions. Instead it provides pluggable components and systems than can be configured, adapted and extended to fits the particular needs at hand. This early release has only basic functionality, but it already demonstrates the power of the underlying architecture for rapid development. The goals of the project include: * Making Python game development faster and more fun by allowing the developer to focus on creating their game rather than getting bogged down in architecture, low-level apis and adapting ill-fitting tools together. * To provide pluggable and extensible parts that implement first-class techniques and algorithms that can be leveraged for many projects. * To fully document the engine and provide examples that demonstrate best practices for others to base their projects on. * To facilitate outside contribution of parts and ideas into the framework that have proven useful in the wild. * To provide optional native-code optimized parts for maximum performance, but also provide equivalent parts coded in pure Python for ease of installation and distribution. Not all of these goals have been realized yet, but I feel the project is well on their path. License --- Grease is distributed under a permissive MIT-style open source license. This license permits you to use grease for commercial or non-commercial purposes free of charge. It makes no demands on how, or whether, you license, or release the code derived from or built upon Grease, other than preservation of copyright notice. For a complete text of the license see the ``LICENSE.txt`` file in the source distrbution. Requirements Grease is platform-independent and should run on any operating system supporting Python and Pyglet. The following are required to build and install Grease: * Python 2.6 (http://www.python.org/) * Pyglet 1.1 (http://www.pyglet.org/) Downloading Grease -- You can download Grease from the Python package index (pypi): * http://pypi.python.org/pypi/grease/ Documentation - You can browse the documentation online at: * http://pygamesf.org/~casey/grease/doc/ The documentation is also available for offline viewing in the ``doc/build/html`` subdirectory for the source distribution. Development Status -- Grease is alpha software under active development. The APIs may change in future releases, however efforts will be made to minimize breakage between releases. -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
virtualenvwrapper 2.0
What is virtualenvwrapper = virtualenvwrapper_ is a set of extensions to Ian Bicking's virtualenv_ tool. The extensions include wrappers for creating and deleting virtual environments and otherwise managing your development workflow, making it easier to work on more than one project at a time without introducing conflicts in their dependencies. What's New in 2.0 = This new version uses a significantly rewritten version of the hook/callback subsystem to make it easier to share extensions. For example, released at the same time is virtualenvwrapper-emacs-desktop_, a plugin to switch emacs project files when you switch virtualenvs. Existing user scripts should continue to work as-written. Any failures are probably a bug, so please report them on the bitbucket tracker. Documentation for the new plugin system is available in the virtualenvwrapper docs_. I also took this opportunity to change the name of the shell script containing most of the virtualenvwrapper functionality from virtualenvwrapper_bashrc to virtualenvwrapper.sh. This reflects the fact that several shells other than bash are supported (bash, sh, ksh, and zsh are all reported to work). You'll want to update your shell startup file after upgrading to 2.0. The work to create the plugin system was triggered by a couple of recent feature requests for environment templates and for a new command to create a sub-shell instead of simply changing the settings of the current shell. The new, more powerful, plugin capabilities will make it easier to develop these and similar features. I'm looking forward to seeing what the community comes up with. I especially want someone to write a plugin to start a copy of a development server for a Django project if one is found in a virtualenv. You'll get bonus points if it opens the home page of the server in a web browser. .. _virtualenv: http://pypi.python.org/pypi/virtualenv .. _virtualenvwrapper: http://www.doughellmann.com/projects/virtualenvwrapper/ .. _virtualenvwrapper-emacs-desktop: http://www.doughellmann.com/projects/virtualenvwrapper-emacs-desktop/ .. _docs: http://www.doughellmann.com/docs/virtualenvwrapper/ -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
WxPython's Py Suite (PyCrust, etc.) updated with new magic features and new notebook interface shell, PySlices
WxPython's Py Suite (PyCrust, etc.) updated with new magic features and new
notebook interface shell, PySlices.
WxPython has, for a long time, included PyCrust, one of the most popular
Python shells. PyCrust has found uses in a number of projects, including
Stani's Python Editor and some projects at Enthought. PyCrust, part of the
larger Py suite of tools, had been dormant for some time now, but it is
now under a new maintainer and has recently been updated! Py Suite 0.9.8.3
can be found in the wxPython 2.9 svn branch (import path is wx.py),
on a Google code page (http://code.google.com/p/wxpysuite/)
and in PyPI (package name is wx_py).
Py Suite 0.9.8.3 requires wxPython 2.8 or later.
A summary of the major changes follows:
The biggest change is certainly the inclusion of a new notebook interface
version of PyCrust called PySlices into the Py suite! It features
multi-line execution in re-runnable code blocks called slices and the
ability to save to a simple .pyslices format that when converted to .py
is still valid python code! PySlices is a great lightweight alternative
to the excellent SAGE and Reinteract projects.
Both PyCrust and PySlices now include some ipython style magic features:
Unix-style path functions:
cd, ls, and pwd all work as expected
Space based function calls:
f 1 will automatically convert to f(1)
? character to call help:
?dir is equivalent to help(dir)
! character to call operating system shell commands:
!foobar is automatically converted to commands.getoutput('foobar')
There is also a highly experimental shell (not included in the wxPython svn
version) called SymPySlices that uses sympy for for automatic symbol
creation, and allows for the use of unicode charcters directly in python.
Mathematical operators (including some infix operators via ast parsing) are
supported. SymPySlices additionally requires Python 2.6 or later and sympy.
This is still very experimental, so please let me know if you have
questions, problems, or ideas (david.n.mashb...@gmail.com)!
You can read more about these projects on the google code page:
http://code.google.com/p/wxpysuite/
at the PyPI page:
http://pypi.python.org/pypi/wx_py/0.9.8.3
and in the original wxTrac ticket:
http://trac.wxwidgets.org/ticket/10959
Feel free to email me with questions, bugs, and feature requests!
PA HREF=http://code.google.com/p/wxpysuite/;Py Suite 0.9.8.3/A - WxPython's Py
Suite (PyCrust, etc.) updated with new magic features and new notebook interface shell, PySlices.
(06-April-2010)
--
http://mail.python.org/mailman/listinfo/python-announce-list
Support the Python Software Foundation:
http://www.python.org/psf/donations/
ANN: oejskit 0.8.8 JavaScript in-browser testing with py.test plugin and unittest.py glue
I'm happy to announce a new release of OE jskit 0.8.8 available on PyPI. Main points of interest: * the code to check for the presence of browsers locally has been improved, browser specifications can now with much more confidence list absent browsers and the respective runs/tests will be skipped * added a workaround to a bug in Firefox 3.5 that interferes with the global variable leak detection code, this is simply turned off for FF3.5. The bug itself is fixed in FF3.6 About OE jskit: jskit contains infrastructure and in particular a py.test plugin to enable running unit tests for JavaScript code inside browsers. It contains also glue code to run JavaScript tests from unittest.py based test suites. The approach also enables to write integration tests such that the JavaScript code is tested against server-side Python code mocked as necessary. Any server-side framework that can already be exposed through WSGI can play. The plugin requires py.test 1.1.1 and should also work with current trunk. More information and downloading at: http://pypi.python.org/pypi/oejskit including a changelog, documentation and the talk I gave at Europython 2009. jskit was initially developed by Open End AB and is released under the MIT license. In various incarnations it has been in use and useful at Open End for more than two years, we are quite happy to share it. Samuele Pedroni for Open End ___ py-dev mailing list py-...@codespeak.net http://codespeak.net/mailman/listinfo/py-dev ___ py-dev mailing list py-...@codespeak.net http://codespeak.net/mailman/listinfo/py-dev -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
PyCon Australia Call For Proposals
Hi everyone, I'm happy to announce that on the 26th and 27th of June we are running PyCon Australia in Sydney! http://pycon-au.org/ We are looking for proposals for Talks on all aspects of Python programming from novice to advanced levels; applications and frameworks, or how you have been involved in introducing Python into your organisation. We welcome first-time speakers; we are a community conference and we are eager to hear about your experience. If you have friends or colleagues who have something valuable to contribute, twist their arms to tell us about it! Please also forward this Call for Proposals to anyone that you feel may be interested. To find out more go to the official Call for Proposals page here: http://pycon-au.org/2010/conference/proposals/ The deadline for proposal submission is the 29th of April. Proposal acceptance will be announced on the 12th of May. See you in Sydney in June! Richard Jones PyCon AU Program Chair -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
python Barcamp in Cologne - regional unconference
The german python usergroup pyCologne announces a barcamp at 17.4 in cologne. For further details see http://python-barcamp.de (Sorry, this page is in German only) An unconference is a facilitated, participant-driven conference centered on a theme or purpose (http://en.wikipedia.org/wiki/ Unconference). Reimar -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations/
Re: Getting Local MAC Address
Lawrence D'Oliveiro wrote: In message ec6d247c-a6b0-4f33-a36b-1d33eace6...@k19g2000yqn.googlegroups.com, Booter wrote: I am new to python ans was wondering if there was a way to get the mac address from the local NIC? What if you have more than one? you can try with netifaces : http://pypi.python.org/pypi/netifaces/0.3 I use them on both Windows and Linux -- http://mail.python.org/mailman/listinfo/python-list
Re: (a==b) ? 'Yes' : 'No'
Steven D'Aprano ste...@remove.this.cybersource.com.au wrote: On Tue, 06 Apr 2010 16:54:18 +, Duncan Booth wrote: Albert van der Horst alb...@spenarnc.xs4all.nl wrote: Old hands would have ... stamp =( weight=1000 and 120 or weight=500 and 100 or weight=250 and 80 or weight=100 and 60 or 44 ) (Kind of a brain twister, I think, inferior to C, once the c-construct is accepted as idiomatic.) I doubt many old hands would try to join multiple and/or operators that way. Most old hands would (IMHO) write the if statements out in full, though some might remember that Python comes 'batteries included': from bisect import bisect WEIGHTS = [100, 250, 500, 1000] STAMPS = [44, 60, 80, 100, 120] ... stamp = STAMPS[bisect(WEIGHTS,weight)] Isn't that an awfully heavyweight and obfuscated solution for choosing between five options? Fifty-five options, absolutely, but five? I did say most people would simply write out an if statement. However, since you ask, using bisect here allows you to separate the data from the code and even with only 5 values that may be worthwhile. Especially if there's any risk it could become 6 next week. -- Duncan Booth http://kupuguy.blogspot.com -- http://mail.python.org/mailman/listinfo/python-list
Re: pass object or use self.object?
Lie Ryan a écrit : (snip) Since in function in python is a first-class object, you can instead do something like: def process(document): # note: document should encapsulate its own logic document.do_one_thing() Obvious case of encapsulation abuse here. Should a file object encapsulate all the csv parsing logic ? (and the html parsing, xml parsing, image manipulation etc...) ? Should a model object encapsulate the presentation logic ? I could go on for hours here... and I think for your purpose, the mixin pattern could cleanly separate manipulation and document while still obeying object-oriented pattern that document is self-sufficient: # language with only single-inheritance can only dream to do this class Appendable(object): def append(self, text): self.text += text class Savable(object): def save(self, fileobj): fileobj.write(self.text) class Openable(object): def open(self, fileobj): self.text = fileobj.read() class Document(Appendable, Savable, Openable): def __init__(self): self.text = '' Anyone having enough experience with Zope2 knows why this sucks big time. -- http://mail.python.org/mailman/listinfo/python-list
Python and Regular Expressions
Hello,
i want to parse this String:
version 3.5.1 {
$pid_dir = /opt/samba-3.5.1/var/locks/
$bin_dir = /opt/samba-3.5.1/bin/
service smbd {
bin = ${bin_dir}smbd -D
pid = ${pid_dir}smbd.pid
}
service nmbd {
bin = ${bin_dir}nmbd -D
pid = ${pid_dir}nmbd.pid
}
service winbindd {
bin = ${bin_dir}winbindd -D
pid = ${pid_dir}winbindd.pid
}
}
version 3.2.14 {
$pid_dir = /opt/samba-3.5.1/var/locks/
$bin_dir = /opt/samba-3.5.1/bin/
service smbd {
bin = ${bin_dir}smbd -D
pid = ${pid_dir}smbd.pid
}
service nmbd {
bin = ${bin_dir}nmbd -D
pid = ${pid_dir}nmbd.pid
}
service winbindd {
bin = ${bin_dir}winbindd -D
pid = ${pid_dir}winbindd.pid
}
}
Step 1:
version 3.2.14 {
$pid_dir = /opt/samba-3.5.1/var/locks/
$bin_dir = /opt/samba-3.5.1/bin/
service smbd {
bin = ${bin_dir}smbd -D
pid = ${pid_dir}smbd.pid
}
service nmbd {
bin = ${bin_dir}nmbd -D
pid = ${pid_dir}nmbd.pid
}
service winbindd {
bin = ${bin_dir}winbindd -D
pid = ${pid_dir}winbindd.pid
}
}
Step 2:
service smbd {
bin = ${bin_dir}smbd -D
pid = ${pid_dir}smbd.pid
}
Step 3:
$pid_dir = /opt/samba-3.5.1/var/locks/
$bin_dir = /opt/samba-3.5.1/bin/
Step 4:
bin = ${bin_dir}smbd -D
pid = ${pid_dir}smbd.pid
My Regular Expressions:
version[\s]*[\w\.]*[\s]*\{[\w\s\n\t\{\}=\$\.\-_\/]*\}
service[\s]*[\w]*[\s]*\{([\n\s\w\=]*(\$\{[\w_]*\})*[\w\s\-=\.]*)*\}
I think it was no good Solution. I'am trying with Groups:
(service[\s\w]*)\{([\n\w\s=\$\-_\.]*)
but this part makes Problems: ${bin_dir}
Kind Regards
Richi
--
http://mail.python.org/mailman/listinfo/python-list
Re: plotting in python 3
On Apr 6, 11:52 pm, Rolf Camps rolf_ca...@fsfe.org wrote: Op dinsdag 06-04-2010 om 14:55 uur [tijdzone -0500], schreef Christopher Choi: It was after the homework I asked my question. All plot solutions i found where for python2.x. gnuplot_py states on its homepage you need a 'working copy of numpy'. I don't think numpy is ported to python 3.x. Or is it? Google charts could be quick and dirty solution -- http://pygooglechart.slowchop.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Python and Regular Expressions
On Wed, Apr 7, 2010 at 1:37 AM, Richard Lamboj richard.lam...@bilcom.at wrote:
i want to parse this String:
version 3.5.1 {
$pid_dir = /opt/samba-3.5.1/var/locks/
$bin_dir = /opt/samba-3.5.1/bin/
service smbd {
bin = ${bin_dir}smbd -D
pid = ${pid_dir}smbd.pid
}
service nmbd {
bin = ${bin_dir}nmbd -D
pid = ${pid_dir}nmbd.pid
}
service winbindd {
bin = ${bin_dir}winbindd -D
pid = ${pid_dir}winbindd.pid
}
}
version 3.2.14 {
$pid_dir = /opt/samba-3.5.1/var/locks/
$bin_dir = /opt/samba-3.5.1/bin/
service smbd {
bin = ${bin_dir}smbd -D
pid = ${pid_dir}smbd.pid
}
service nmbd {
bin = ${bin_dir}nmbd -D
pid = ${pid_dir}nmbd.pid
}
service winbindd {
bin = ${bin_dir}winbindd -D
pid = ${pid_dir}winbindd.pid
}
}
Step 1:
version 3.2.14 {
$pid_dir = /opt/samba-3.5.1/var/locks/
$bin_dir = /opt/samba-3.5.1/bin/
service smbd {
bin = ${bin_dir}smbd -D
pid = ${pid_dir}smbd.pid
}
service nmbd {
bin = ${bin_dir}nmbd -D
pid = ${pid_dir}nmbd.pid
}
service winbindd {
bin = ${bin_dir}winbindd -D
pid = ${pid_dir}winbindd.pid
}
}
Step 2:
service smbd {
bin = ${bin_dir}smbd -D
pid = ${pid_dir}smbd.pid
}
Step 3:
$pid_dir = /opt/samba-3.5.1/var/locks/
$bin_dir = /opt/samba-3.5.1/bin/
Step 4:
bin = ${bin_dir}smbd -D
pid = ${pid_dir}smbd.pid
My Regular Expressions:
version[\s]*[\w\.]*[\s]*\{[\w\s\n\t\{\}=\$\.\-_\/]*\}
service[\s]*[\w]*[\s]*\{([\n\s\w\=]*(\$\{[\w_]*\})*[\w\s\-=\.]*)*\}
I think it was no good Solution. I'am trying with Groups:
(service[\s\w]*)\{([\n\w\s=\$\-_\.]*)
but this part makes Problems: ${bin_dir}
Regular expressions != Parsers
Every time someone tries to parse nested structures using regular
expressions, Jamie Zawinski kills a puppy.
Try using an *actual* parser, such as Pyparsing:
http://pyparsing.wikispaces.com/
Cheers,
Chris
--
Some people, when confronted with a problem, think:
I know, I'll use regular expressions. Now they have two problems.
http://blog.rebertia.com
--
http://mail.python.org/mailman/listinfo/python-list
Re: converting a timezone-less datetime to seconds since the epoch
Hi Chris, Chris Rebert wrote: from calendar import timegm def timestamp(dttm): return timegm(dttm.utctimetuple()) #the *utc*timetuple change is just for extra consistency #it shouldn't actually make a difference here And problem solved. As for what the problem was: Paraphrasing the table I got added to the time module docs: (http://docs.python.org/library/time.html) That table is not obvious :-/ Could likely do with its own section... To convert from struct_time in ***UTC*** to seconds since the epoch use calendar.timegm() ...and really, wtf is timegm doing in calendar rather than in time? ;-) I'd be *more* interested in knowing either why the timestamp function or the tests are wrong and how to correct them... You used a function intended for local times on UTC time data, and therefore got incorrect results. Thanks for the info, I don't think I'd ever have gotten to the bottom of this on my own! :-) Chris -- Simplistix - Content Management, Batch Processing Python Consulting - http://www.simplistix.co.uk -- http://mail.python.org/mailman/listinfo/python-list
Re: Python and Regular Expressions
Richard Lamboj a écrit :
Hello,
i want to parse this String:
version 3.5.1 {
$pid_dir = /opt/samba-3.5.1/var/locks/
$bin_dir = /opt/samba-3.5.1/bin/
service smbd {
bin = ${bin_dir}smbd -D
pid = ${pid_dir}smbd.pid
}
service nmbd {
bin = ${bin_dir}nmbd -D
pid = ${pid_dir}nmbd.pid
}
service winbindd {
bin = ${bin_dir}winbindd -D
pid = ${pid_dir}winbindd.pid
}
}
(snip)
I think you'd be better writing a specific parser here. Paul McGuire's
PyParsing package might help:
http://pyparsing.wikispaces.com/
My 2 cents.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Python and Regular Expressions
Am Wednesday 07 April 2010 10:52:14 schrieb Chris Rebert:
On Wed, Apr 7, 2010 at 1:37 AM, Richard Lamboj richard.lam...@bilcom.at
wrote:
i want to parse this String:
version 3.5.1 {
$pid_dir = /opt/samba-3.5.1/var/locks/
$bin_dir = /opt/samba-3.5.1/bin/
service smbd {
bin = ${bin_dir}smbd -D
pid = ${pid_dir}smbd.pid
}
service nmbd {
bin = ${bin_dir}nmbd -D
pid = ${pid_dir}nmbd.pid
}
service winbindd {
bin = ${bin_dir}winbindd -D
pid = ${pid_dir}winbindd.pid
}
}
version 3.2.14 {
$pid_dir = /opt/samba-3.5.1/var/locks/
$bin_dir = /opt/samba-3.5.1/bin/
service smbd {
bin = ${bin_dir}smbd -D
pid = ${pid_dir}smbd.pid
}
service nmbd {
bin = ${bin_dir}nmbd -D
pid = ${pid_dir}nmbd.pid
}
service winbindd {
bin = ${bin_dir}winbindd -D
pid = ${pid_dir}winbindd.pid
}
}
Step 1:
version 3.2.14 {
$pid_dir = /opt/samba-3.5.1/var/locks/
$bin_dir = /opt/samba-3.5.1/bin/
service smbd {
bin = ${bin_dir}smbd -D
pid = ${pid_dir}smbd.pid
}
service nmbd {
bin = ${bin_dir}nmbd -D
pid = ${pid_dir}nmbd.pid
}
service winbindd {
bin = ${bin_dir}winbindd -D
pid = ${pid_dir}winbindd.pid
}
}
Step 2:
service smbd {
bin = ${bin_dir}smbd -D
pid = ${pid_dir}smbd.pid
}
Step 3:
$pid_dir = /opt/samba-3.5.1/var/locks/
$bin_dir = /opt/samba-3.5.1/bin/
Step 4:
bin = ${bin_dir}smbd -D
pid = ${pid_dir}smbd.pid
My Regular Expressions:
version[\s]*[\w\.]*[\s]*\{[\w\s\n\t\{\}=\$\.\-_\/]*\}
service[\s]*[\w]*[\s]*\{([\n\s\w\=]*(\$\{[\w_]*\})*[\w\s\-=\.]*)*\}
I think it was no good Solution. I'am trying with Groups:
(service[\s\w]*)\{([\n\w\s=\$\-_\.]*)
but this part makes Problems: ${bin_dir}
Regular expressions != Parsers
Every time someone tries to parse nested structures using regular
expressions, Jamie Zawinski kills a puppy.
Try using an *actual* parser, such as Pyparsing:
http://pyparsing.wikispaces.com/
Cheers,
Chris
--
Some people, when confronted with a problem, think:
I know, I'll use regular expressions. Now they have two problems.
http://blog.rebertia.com
Well, after some trying with regex, your both right. I will use pyparse it
seems to be the better solution.
Kind Regards
--
http://mail.python.org/mailman/listinfo/python-list
Re: Q about assignment and references
Thanks to all for the informative answers. You made me realize this is a wxPython issue. I have to say, wxPython seems useful, and I'm glad it is available - but it doesn't have the gentlest of learning curves. -- http://mail.python.org/mailman/listinfo/python-list
PyCon Australia Call For Proposals
Hi everyone, I'm happy to announce that on the 26th and 27th of June we are running PyCon Australia in Sydney! http://pycon-au.org/ We are looking for proposals for Talks on all aspects of Python programming from novice to advanced levels; applications and frameworks, or how you have been involved in introducing Python into your organisation. We welcome first-time speakers; we are a community conference and we are eager to hear about your experience. If you have friends or colleagues who have something valuable to contribute, twist their arms to tell us about it! Please also forward this Call for Proposals to anyone that you feel may be interested. To find out more go to the official Call for Proposals page here: http://pycon-au.org/2010/conference/proposals/ The deadline for proposal submission is the 29th of April. Proposal acceptance will be announced on the 12th of May. See you in Sydney in June! Richard Jones PyCon AU Program Chair -- http://mail.python.org/mailman/listinfo/python-list
Re: staticmethod and namespaces
Having an odd problem that I solved, but wondering if its the best solution (seems like a bit of a hack). First off, I'm using an external DLL that requires static callbacks, but because of this, I'm losing instance info. It could be import related? It will make more sense after I diagram it: - So basically I added a list of instances to the base class so I can get at them from the staticmethod. Have you tried using a closure, something like this: class A: def call(self, args): def callback(a, b): # normal function # but I can access self here too call_the_dll_function(callback, args1, args2...) What's bothering me the most is I can't use the global app instance in the A.py module. How can I get at the app instance (currently I'm storing that along with the class instance in the constructor)? Is there another way to do this that's not such a hack? Sorry for the double / partial post :( -- дамјан ((( http://damjan.softver.org.mk/ ))) Q: What's tiny and yellow and very, very, dangerous? A: A canary with the super-user password. -- http://mail.python.org/mailman/listinfo/python-list
Re: converting a timezone-less datetime to seconds since the epoch
On Apr 7, 9:57 am, Chris Withers ch...@simplistix.co.uk wrote: Chris Rebert wrote: To convert from struct_time in ***UTC*** to seconds since the epoch use calendar.timegm() ...and really, wtf is timegm doing in calendar rather than in time? ;-) You're not alone in finding this strange: http://bugs.python.org/issue6280 (the short apologetic reason is that timegm is written in python rather the C) Regards Floris -- http://mail.python.org/mailman/listinfo/python-list
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Re: Impersonating a Different Logon
On Tue, Apr 6, 2010 at 4:11 PM, Tim Golden m...@timgolden.me.uk wrote: On 06/04/2010 20:26, Kevin Holleran wrote: Hello, I am sweeping some of our networks to find devices. When I find a device I try to connect to the registry using _winreg and then query a specific key that I am interested in. This works great for machines that are on our domain, but there are left over machines that are stand alone and the credentials fail. I understand you cannot pass in credentials with _winreg but is there a way to simulate a logon of another user (the machine's local admin) to query the registry? The simplest may well be to use WMI (example from here): http://timgolden.me.uk/python/wmi/cookbook.html#list-registry-keys code - untested import wmi reg = wmi.WMI ( machine, user=machine\admin, password=Secret, namespace=DEFAULT ).StdRegProv result, names = reg.EnumKey ( hDefKey=_winreg.HKEY_LOCAL_MACHINE, sSubKeyName=Software ) for name in names: print name /code I can't try it out at the moment but in principle it should work. TJG -- http://mail.python.org/mailman/listinfo/python-list Thanks, I was able to connect to the remote machine. However, how do I query for a very specific key value? I have to scan hundreds of machines and need want to reduce what I am querying. I would like to be able to scan a very specific key and report on its value. With _winreg I could just do: keyPath = _winreg.ConnectRegistry(r\\ + ip_a,_winreg.HKEY_LOCAL_MACHINE) try: hKey = _winreg.OpenKey (keyPath, rSYSTEM\CurrentControlSet\services\Tcpip\Parameters, 0, _winreg.KEY_READ) value,type = _winreg.QueryValueEx(hKey,Domain) Also, is there a performance hit with WMI where perhaps I want to try to connect with the inherited credentials using _winreg first and then use the MWI if that fails? Thanks for your help! Kevin -- http://mail.python.org/mailman/listinfo/python-list
Striving for PEP-8 compliance
[ Please keep me cc'ed, I'm not subscribed ] Hi all I've written a bunch of internal libraries for my company, and they all use two space indents, and I'd like to be more consistent and conform to PEP-8 as much as I can. My problem is I would like to be certain that any changes do not alter the logic of the libraries. When doing this in C, I would simply compile each module to an object file, calculate the MD5 of the object file, then make the whitespace changes, recompile the object file and compare the checksums. If the checksums match, then the files are equivalent. Is there any way to do something semantically the same as this with python? Cheers Tom -- http://mail.python.org/mailman/listinfo/python-list
Re: Striving for PEP-8 compliance
On Wed, Apr 7, 2010 at 10:53 AM, Tom Evans tevans...@googlemail.com wrote: [ Please keep me cc'ed, I'm not subscribed ] Hi all I've written a bunch of internal libraries for my company, and they all use two space indents, and I'd like to be more consistent and conform to PEP-8 as much as I can. My problem is I would like to be certain that any changes do not alter the logic of the libraries. When doing this in C, I would simply compile each module to an object file, calculate the MD5 of the object file, then make the whitespace changes, recompile the object file and compare the checksums. If the checksums match, then the files are equivalent. Is there any way to do something semantically the same as this with python? Probably the logical thing would be to run your test suite against it, but assuming that's not an option, you could run the whole thing through dis and check that the bytecode is identical. There's probably an easier way to do this though. Geremy Condra -- http://mail.python.org/mailman/listinfo/python-list
Re: imports again
En Tue, 06 Apr 2010 14:25:38 -0300, Alex Hall mehg...@gmail.com escribió: Sorry this is a forward (long story involving a braille notetaker's bad copy/paste and GMail's annoying mobile site). Basically, I am getting errors when I run the project at http://www.gateway2somewhere.com/sw.zip Error 404 -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Impersonating a Different Logon
On 07/04/2010 14:57, Kevin Holleran wrote: Thanks, I was able to connect to the remote machine. However, how do I query for a very specific key value? I have to scan hundreds of machines and need want to reduce what I am querying. I would like to be able to scan a very specific key and report on its value. The docs for the WMI Registry provider are here: http://msdn.microsoft.com/en-us/library/aa393664%28VS.85%29.aspx and you probably want this: http://msdn.microsoft.com/en-us/library/aa390788%28v=VS.85%29.aspx With _winreg I could just do: keyPath = _winreg.ConnectRegistry(r\\ + ip_a,_winreg.HKEY_LOCAL_MACHINE) try: hKey = _winreg.OpenKey (keyPath, rSYSTEM\CurrentControlSet\services\Tcpip\Parameters, 0, _winreg.KEY_READ) value,type = _winreg.QueryValueEx(hKey,Domain) Also, is there a performance hit with WMI where perhaps I want to try to connect with the inherited credentials using _winreg first and then use the MWI if that fails? Certainly a consideration. Generally WMI isn't the fastest thing in the world either to connect nor to query. I suspect a try/except with _winreg is worth a go, falling through to WMI. TJG -- http://mail.python.org/mailman/listinfo/python-list
Re: Striving for PEP-8 compliance
On 2010-04-07, Tom Evans tevans...@googlemail.com wrote: [ Please keep me cc'ed, I'm not subscribed ] Sorry. I post via gmane.org, so cc'ing you would require some extra work, and I'm too lazy. I've written a bunch of internal libraries for my company, and they all use two space indents, and I'd like to be more consistent and conform to PEP-8 as much as I can. My problem is I would like to be certain that any changes do not alter the logic of the libraries. When doing this in C, I would simply compile each module to an object file, calculate the MD5 of the object file, then make the whitespace changes, recompile the object file and compare the checksums. If the checksums match, then the files are equivalent. In my experience, that doesn't work. Whitespace changes can effect line numbers, so object files containing debug info will differ. Many object format also contain other meta-data about date, time, path of source file, etc. that can differ between semantically equivalent files. Is there any way to do something semantically the same as this with python? Have you tried compiling the python files and compare the resulting .pyc files? -- Grant Edwards grant.b.edwardsYow! I selected E5 ... but at I didn't hear Sam the Sham gmail.comand the Pharoahs! -- http://mail.python.org/mailman/listinfo/python-list
Re: Simplify Python
On 6 Apr, 20:04, ja1lbr3ak superheroco...@gmail.com wrote:
I'm trying to teach myself Python, and so have been simplifying a
calculator program that I wrote. The original was 77 lines for the
same functionality. Problem is, I've hit a wall. Can anyone help?
loop = input(Enter 1 for the calculator, 2 for the Fibonacci
sequence, or something else to quit: )
while loop 3 and loop 0:
if loop == 1:
print input(\nPut in an equation: )
if loop == 2:
a, b, n = 1, 1, (input(\nWhat Fibonacci number do you want to
go to? ))
while n 0:
print a
a, b, n = b, a+b, n-1
loop = input(\nEnter 1 for the calculator, 2 for the Fibonacci
sequence, or something else to quit: )
To replicate what you have above, I would do something like;
quit=False
while not quit:
choice=input('1 for calc, 2 for fib, any other to quit')
if choice==1:
print input('Enter expression: ')
elif choice==2:
a, b, n = 1, 1, input(\nWhat Fibonacci number do you want to
go to?
)
while n 0:
print a
a, b, n = b, a+b, n-1
else:
quit=True
?
--
http://mail.python.org/mailman/listinfo/python-list
Re: Striving for PEP-8 compliance
En Wed, 07 Apr 2010 11:53:58 -0300, Tom Evans tevans...@googlemail.com escribió: [ Please keep me cc'ed, I'm not subscribed ] Sorry; you may read this at http://groups.google.com/group/comp.lang.python/ I've written a bunch of internal libraries for my company, and they all use two space indents, and I'd like to be more consistent and conform to PEP-8 as much as I can. reindent.py (in the Tools directory of your Python installation) does exactly that. My problem is I would like to be certain that any changes do not alter the logic of the libraries. When doing this in C, I would simply compile each module to an object file, calculate the MD5 of the object file, then make the whitespace changes, recompile the object file and compare the checksums. If the checksums match, then the files are equivalent. If you only reindent the code (without adding/removing lines) then you can compare the compiled .pyc files (excluding the first 8 bytes that contain a magic number and the source file timestamp). Remember that code objects contain line number information. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Striving for PEP-8 compliance
En Wed, 07 Apr 2010 11:53:58 -0300, Tom Evans tevans...@googlemail.com escribió: [ Please keep me cc'ed, I'm not subscribed ] Sorry; you may read this at http://groups.google.com/group/comp.lang.python/ I've written a bunch of internal libraries for my company, and they all use two space indents, and I'd like to be more consistent and conform to PEP-8 as much as I can. reindent.py (in the Tools directory of your Python installation) does exactly that. My problem is I would like to be certain that any changes do not alter the logic of the libraries. When doing this in C, I would simply compile each module to an object file, calculate the MD5 of the object file, then make the whitespace changes, recompile the object file and compare the checksums. If the checksums match, then the files are equivalent. If you only reindent the code (without adding/removing lines) then you can compare the compiled .pyc files (excluding the first 8 bytes that contain a magic number and the source file timestamp). Remember that code objects contain line number information. -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
Re: Striving for PEP-8 compliance
On Wed, Apr 7, 2010 at 4:10 PM, geremy condra debat...@gmail.com wrote:
On Wed, Apr 7, 2010 at 10:53 AM, Tom Evans tevans...@googlemail.com wrote:
[ Please keep me cc'ed, I'm not subscribed ]
Hi all
I've written a bunch of internal libraries for my company, and they
all use two space indents, and I'd like to be more consistent and
conform to PEP-8 as much as I can.
My problem is I would like to be certain that any changes do not alter
the logic of the libraries. When doing this in C, I would simply
compile each module to an object file, calculate the MD5 of the object
file, then make the whitespace changes, recompile the object file and
compare the checksums. If the checksums match, then the files are
equivalent.
Is there any way to do something semantically the same as this with python?
Probably the logical thing would be to run your test suite against
it, but assuming that's not an option, you could run the whole
thing through dis and check that the bytecode is identical. There's
probably an easier way to do this though.
Geremy Condra
dis looks like it may be interesting.
I had looked a little at the bytecode, but only enough to rule out md5
sums as a solution. Looking closer at the bytecode for a simple
module, it seems like only a few bytes change (see below for hexdumps
of the pyc).
So in this case, only bytes 5 and 6 changed, the rest of the file
remains exactly the same. Looks like I need to do some digging to find
out what those bytes mean.
Cheers
Tom
2 space indents:
d1 f2 0d 0a 51 a7 bc 4b 63 00 00 00 00 00 00 00 |Q..Kc...|
0010 00 02 00 00 00 40 00 00 00 73 28 00 00 00 64 00 |.@...s(...d.|
0020 00 84 00 00 5a 00 00 65 01 00 64 01 00 6a 02 00 |Z..e..d..j..|
0030 6f 0e 00 01 65 00 00 65 02 00 83 01 00 01 6e 01 |o...e..e..n.|
0040 00 01 64 02 00 53 28 03 00 00 00 63 01 00 00 00 |..d..S(c|
0050 01 00 00 00 03 00 00 00 43 00 00 00 73 20 00 00 |C...s ..|
0060 00 64 01 00 47 48 7c 00 00 6f 10 00 01 68 01 00 |.d..GH|..o...h..|
0070 64 02 00 64 01 00 36 47 48 6e 01 00 01 64 00 00 |d..d..6GHn...d..|
0080 53 28 03 00 00 00 4e 74 05 00 00 00 68 65 6c 6c |S(Nthell|
0090 6f 74 05 00 00 00 77 6f 72 6c 64 28 00 00 00 00 |otworld(|
00a0 28 01 00 00 00 74 03 00 00 00 62 61 72 28 00 00 |(tbar(..|
00b0 00 00 28 00 00 00 00 73 0e 00 00 00 74 65 73 74 |..(stest|
00c0 6c 69 62 2f 66 6f 6f 2e 70 79 74 03 00 00 00 66 |lib/foo.pytf|
00d0 6f 6f 01 00 00 00 73 08 00 00 00 00 01 05 01 07 |oos.|
00e0 01 03 01 74 08 00 00 00 5f 5f 6d 61 69 6e 5f 5f |...t__main__|
00f0 4e 28 03 00 00 00 52 03 00 00 00 74 08 00 00 00 |N(Rt|
0100 5f 5f 6e 61 6d 65 5f 5f 74 04 00 00 00 54 72 75 |__name__tTru|
0110 65 28 00 00 00 00 28 00 00 00 00 28 00 00 00 00 |e(((|
0120 73 0e 00 00 00 74 65 73 74 6c 69 62 2f 66 6f 6f |stestlib/foo|
0130 2e 70 79 74 08 00 00 00 3c 6d 6f 64 75 6c 65 3e |.pytmodule|
0140 01 00 00 00 73 04 00 00 00 09 07 0d 01 |s|
014d
4 space indents:
d1 f2 0d 0a 51 a7 bc 4b 63 00 00 00 00 00 00 00 |Q..Kc...|
0010 00 02 00 00 00 40 00 00 00 73 28 00 00 00 64 00 |.@...s(...d.|
0020 00 84 00 00 5a 00 00 65 01 00 64 01 00 6a 02 00 |Z..e..d..j..|
0030 6f 0e 00 01 65 00 00 65 02 00 83 01 00 01 6e 01 |o...e..e..n.|
0040 00 01 64 02 00 53 28 03 00 00 00 63 01 00 00 00 |..d..S(c|
0050 01 00 00 00 03 00 00 00 43 00 00 00 73 20 00 00 |C...s ..|
0060 00 64 01 00 47 48 7c 00 00 6f 10 00 01 68 01 00 |.d..GH|..o...h..|
0070 64 02 00 64 01 00 36 47 48 6e 01 00 01 64 00 00 |d..d..6GHn...d..|
0080 53 28 03 00 00 00 4e 74 05 00 00 00 68 65 6c 6c |S(Nthell|
0090 6f 74 05 00 00 00 77 6f 72 6c 64 28 00 00 00 00 |otworld(|
00a0 28 01 00 00 00 74 03 00 00 00 62 61 72 28 00 00 |(tbar(..|
00b0 00 00 28 00 00 00 00 73 0e 00 00 00 74 65 73 74 |..(stest|
00c0 6c 69 62 2f 66 6f 6f 2e 70 79 74 03 00 00 00 66 |lib/foo.pytf|
00d0 6f 6f 01 00 00 00 73 08 00 00 00 00 01 05 01 07 |oos.|
00e0 01 03 01 74 08 00 00 00 5f 5f 6d 61 69 6e 5f 5f |...t__main__|
00f0 4e 28 03 00 00 00 52 03 00 00 00 74 08 00 00 00 |N(Rt|
0100 5f 5f 6e 61 6d 65 5f 5f 74 04 00 00 00 54 72 75 |__name__tTru|
0110 65 28 00 00 00 00 28 00 00 00 00 28 00 00 00 00 |e(((|
0120 73 0e 00 00 00 74 65 73 74 6c 69 62 2f 66 6f 6f |stestlib/foo|
0130 2e 70 79 74 08 00 00 00 3c 6d 6f 64 75 6c 65 3e |.pytmodule|
0140 01 00 00 00 73 04 00 00 00 09 07 0d 01 |s|
014d
python code: testlib/foo.py
def foo(bar):
print hello
if bar:
print {
'hello': 'world'
}
if
Re: Striving for PEP-8 compliance
On 2010-04-07 11:06 AM, Tom Evans wrote: On Wed, Apr 7, 2010 at 4:10 PM, geremy condradebat...@gmail.com wrote: On Wed, Apr 7, 2010 at 10:53 AM, Tom Evanstevans...@googlemail.com wrote: [ Please keep me cc'ed, I'm not subscribed ] Hi all I've written a bunch of internal libraries for my company, and they all use two space indents, and I'd like to be more consistent and conform to PEP-8 as much as I can. My problem is I would like to be certain that any changes do not alter the logic of the libraries. When doing this in C, I would simply compile each module to an object file, calculate the MD5 of the object file, then make the whitespace changes, recompile the object file and compare the checksums. If the checksums match, then the files are equivalent. Is there any way to do something semantically the same as this with python? Probably the logical thing would be to run your test suite against it, but assuming that's not an option, you could run the whole thing through dis and check that the bytecode is identical. There's probably an easier way to do this though. Geremy Condra dis looks like it may be interesting. I had looked a little at the bytecode, but only enough to rule out md5 sums as a solution. Looking closer at the bytecode for a simple module, it seems like only a few bytes change (see below for hexdumps of the pyc). So in this case, only bytes 5 and 6 changed, the rest of the file remains exactly the same. Looks like I need to do some digging to find out what those bytes mean. You will also have to be careful about docstrings. If you are cleaning up for style reasons, you will also end up indenting the triple-quoted docstrings and thus change their contents. This will be reflected in the bytecode. In [1]: def f(): ...: This is ...: a docstring. ...: ...: ...: In [2]: def g(): ...: This is ...: a docstring. ...: ...: ...: In [3]: f.__doc__ Out[3]: 'This is \na docstring.\n' In [4]: g.__doc__ Out[4]: 'This is\n a docstring.\n ' -- Robert Kern I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth. -- Umberto Eco -- http://mail.python.org/mailman/listinfo/python-list
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Re: (a==b) ? 'Yes' : 'No'
On 4/6/2010 9:20 PM Steven D'Aprano said... On Tue, 06 Apr 2010 16:54:18 +, Duncan Booth wrote: Most old hands would (IMHO) write the if statements out in full, though some might remember that Python comes 'batteries included': from bisect import bisect WEIGHTS = [100, 250, 500, 1000] STAMPS = [44, 60, 80, 100, 120] ... stamp = STAMPS[bisect(WEIGHTS,weight)] Isn't that an awfully heavyweight and obfuscated solution for choosing between five options? Fifty-five options, absolutely, but five? Would it be easier to digest as: from bisect import bisect as selectindex # WEIGHTLIMITS = [100, 250, 500, 1000] POSTAGEAMOUNTS = [44, 60, 80, 100, 120] postage = POSTAGEAMOUNTS[selectindex(WEIGHTLIMITS, weight)] --- I've used bisect this way for some time -- I think Tim may have pointed it out -- and it's been handy ever since. Emile -- http://mail.python.org/mailman/listinfo/python-list
Re: pass object or use self.object?
On Apr 6, 11:19 am, Jean-Michel Pichavant jeanmic...@sequans.com
wrote:
Tim Arnold wrote:
Hi,
I have a few classes that manipulate documents. One is really a
process that I use a class for just to bundle a bunch of functions
together (and to keep my call signatures the same for each of my
manipulator classes).
So my question is whether it's bad practice to set things up so each
method operates on self.document or should I pass document around from
one function to the next?
pseudo code:
class ManipulatorA(object):
def process(self, document):
document = self.do_one_thing(document)
document = self.do_another_thing(document)
# bunch of similar lines
return document
or
class ManipulatorA(object):
def process(self, document):
self.document = document
self.do_one_thing() # operates on self.document
self.do_another_thing()
# bunch of similar lines
return self.document
I ask because I've been told that the first case is easier to
understand. I never thought of it before, so I'd appreciate any
comments.
thanks,
--Tim
Usually, when using classes as namespace, functions are declared as
static (or as classmethod if required).
e.g.
class Foo:
@classmethod
def process(cls, document):
print 'process of'
cls.foo(document)
@staticmethod
def foo(document):
print document
In [5]: Foo.process('my document')
process of
my document
There is no more question about self, 'cause there is no more self. You
don't need to create any instance of Foo neither.
JM
Thanks for the input. I had always wondered about static methods; I'd
ask myself why don't they just write a function in the first place?
Now I see why. My situation poses a problem that I guess static
methods were invented to solve. And it settles the question about
using self.document since there is no longer any self. And as Bruno
says, it's easier to understand and refactor.
thanks,
--Tim
--
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[2.5.1/cookielib] How to display specific cookie?
Hello I'm using ActivePython 2.5.1 and the cookielib package to retrieve web pages. I'd like to display a given cookie from the cookiejar instead of the whole thing: #OK for index, cookie in enumerate(cj): print index, ' : ', cookie #How to display just PHPSESSID? #AttributeError: CookieJar instance has no attribute '__getitem__' print PHPSESSID: %s % cj['PHPSESSID'] I'm sure it's very simple but googling for this didn't return samples. Thank you. -- http://mail.python.org/mailman/listinfo/python-list
Re: lambda with floats
On Tue, 06 Apr 2010 23:16:18 -0400, monkeys paw mon...@joemoney.net wrote: I have the following acre meter which works for integers, how do i convert this to float? I tried return float ((208.0 * 208.0) * n) def s(n): ... return lambda x: (208 * 208) * n ... f = s(1) f(1) 43264 208 * 208 43264 f(.25) 43264 The expression lambda x: (208 * 208) * n is independent of x. Is that what you intended? -- To email me, substitute nowhere-spamcop, invalid-net. -- http://mail.python.org/mailman/listinfo/python-list
Re: python as pen and paper substitute
Hello Johan, thanks to you (and everyone else who answered) for your effort. Johan Grönqvist johan.gronqv...@gmail.com writes: Manuel Graune skrev: Manuel Graune manuel.gra...@koeln.de writes: Just as an additional example, let's assume I'd want to add the area of to circles. [...] which can be explained to anyone who knows basic math and is not at all interested in python. Third attempt. The markup now includes tagging of different parts of the code, and printing parts of the source based on a tag. after playing around for a while, this is what I finally ended up with: 88 source ---8 #! /usr/bin/python ## Show # List of all imports: from __future__ import with_statement, print_function from math import pi as PI import sys ## class Source_Printer(object): def __init__(self): self.is_printing= False with open(sys.argv[0]) as file: self.lines=(line for line in file.readlines()) for line in self.lines: if line.startswith(print_source): break elif line == ##\n: self.is_printing= False elif line.startswith(## Show): print(\n) self.is_printing= True elif self.is_printing: print(line,end=) def __call__(self): for line in self.lines: if line == ##\n or line.startswith(print_source): if self.is_printing: self.is_printing= False break else: self.is_printing= False elif line.startswith(## Show): print(\n) self.is_printing= True elif self.is_printing: print(line, end=) print_source= Source_Printer() ## Show #Calculation of first Area: d1= 3.0 A1= d1**2 * PI / 4.0 ## print_source() print (Area of Circle 1:\t, A1) ## Show #Calculation of second area: d2= 5.0 A2= d2**2 * PI / 4.0 ## # This is a comment that won't be printed print_source() print (Area of Circle 2:\t, A2) # This is another one Sum_Of_Areas= A1 + A2 print (Sum of areas:\t, Sum_Of_Areas) 88 result: ---8 # List of all imports: from __future__ import with_statement, print_function from math import pi as PI import sys #Calculation of first Area: d1= 3.0 A1= d1**2 * PI / 4.0 Area of Circle 1:7.06858347058 #Calculation of second area: d2= 5.0 A2= d2**2 * PI / 4.0 Area of Circle 2:19.6349540849 Sum of areas:26.703537 88 result: ---8 Regards, Manuel -- A hundred men did the rational thing. The sum of those rational choices was called panic. Neal Stephenson -- System of the world http://www.graune.org/GnuPG_pubkey.asc Key fingerprint = 1E44 9CBD DEE4 9E07 5E0A 5828 5476 7E92 2DB4 3C99 -- http://mail.python.org/mailman/listinfo/python-list
Re: Performance of list vs. set equality operations
[Gustavo Nare] In other words: The more different elements two collections have, the faster it is to compare them as sets. And as a consequence, the more equivalent elements two collections have, the faster it is to compare them as lists. Is this correct? If two collections are equal, then comparing them as a set is always slower than comparing them as a list. Both have to call __eq__ for every element, but sets have to search for each element while lists can just iterate over consecutive pointers. If the two collections have unequal sizes, then both ways immediately return unequal. If the two collections are unequal but have the same size, then the comparison time is data dependent (when the first mismatch is found). Raymond -- http://mail.python.org/mailman/listinfo/python-list
Re: python as pen and paper substitute
Hello Johan, thanks to you (and everyone else who answered) for your effort. Johan Grönqvist johan.gronqv...@gmail.com writes: Manuel Graune skrev: Manuel Graune manuel.gra...@koeln.de writes: Just as an additional example, let's assume I'd want to add the area of to circles. [...] which can be explained to anyone who knows basic math and is not at all interested in python. Third attempt. The markup now includes tagging of different parts of the code, and printing parts of the source based on a tag. after playing around for a while, this is what I finally ended up with: 88 source ---8 #! /usr/bin/python ## Show # List of all imports: from __future__ import with_statement, print_function from math import pi as PI import sys ## class Source_Printer(object): def __init__(self): self.is_printing= False with open(sys.argv[0]) as file: self.lines= iter(file.readlines()) for line in self.lines: if line.startswith(print_source): break elif line == ##\n: self.is_printing= False elif line.startswith(## Show): print(\n) self.is_printing= True elif self.is_printing: print(line,end=) def __call__(self): for line in self.lines: if line == ##\n or line.startswith(print_source): if self.is_printing: self.is_printing= False break else: self.is_printing= False elif line.startswith(## Show): print(\n) self.is_printing= True elif self.is_printing: print(line, end=) print_source= Source_Printer() ## Show #Calculation of first Area: d1= 3.0 A1= d1**2 * PI / 4.0 ## print_source() print (Area of Circle 1:\t, A1) ## Show #Calculation of second area: d2= 5.0 A2= d2**2 * PI / 4.0 ## # This is a comment that won't be printed print_source() print (Area of Circle 2:\t, A2) # This is another one Sum_Of_Areas= A1 + A2 print (Sum of areas:\t, Sum_Of_Areas) 88 result: ---8 # List of all imports: from __future__ import with_statement, print_function from math import pi as PI import sys #Calculation of first Area: d1= 3.0 A1= d1**2 * PI / 4.0 Area of Circle 1:7.06858347058 #Calculation of second area: d2= 5.0 A2= d2**2 * PI / 4.0 Area of Circle 2:19.6349540849 Sum of areas:26.703537 88 result: ---8 Regards, Manuel -- A hundred men did the rational thing. The sum of those rational choices was called panic. Neal Stephenson -- System of the world http://www.graune.org/GnuPG_pubkey.asc Key fingerprint = 1E44 9CBD DEE4 9E07 5E0A 5828 5476 7E92 2DB4 3C99 -- http://mail.python.org/mailman/listinfo/python-list
+Hi+
http://sites.google.com/site/fgu45ythjg/rfea8i -- Matt -- http://mail.python.org/mailman/listinfo/python-list
[Q] raise exception with fake filename and linenumber
Hi all,
Is it possible to raise exception with custom traceback to specify
file and line?
Situation
=
I'm creating a certain parser.
I want to report syntax error with the same format as other exception.
Example
===
parser.py:
-
1: def parse(filename):
2: if something_is_wrong():
3: linenum = 123
4: raise Exception(syntax error on %s, line %s % (filename,
linenum))
5:
6: parse('example.file')
-
current result:
-
Traceback (most recent call last):
File /tmp/parser.py, line 6, in module
parse('example.file')
File /tmp/parser.py, line 4, in parse
raise Exception(syntax error on %s, line %s % (filename,
linenum))
Exception: syntax error on example.file, line 123
-
my hope is:
-
Traceback (most recent call last):
File /tmp/parser.py, line 6, in module
parse('example.file')
File /tmp/parser.py, line 4, in parse
raise Exception(syntax error on %s, line %s % (filename,
linenum))
File /tmp/example.file, line 123
foreach item in items # wrong syntax line
Exception: syntax error
-
I guess I must create dummy traceback data, but I don't know how to do
it.
Could you give me an advice?
Thank you.
--
regards,
makoto kuwata
--
http://mail.python.org/mailman/listinfo/python-list
fcntl, serial ports and serial signals on RS232.
Hello to all out there,
I'm trying to figure out how to parse the responses from fcntl.ioctl()
calls that modify the serial lines in a way that asserts that the line
is now changed. For example I may want to drop RTS explicitly, and
assert that the line has been dropped before returning.
Here is a brief snippet of code that I've been using to do that, but
not sure what to do with the returned response:
def set_RTS(self, state=True):
if self.fd is None:
return 0
p = struct.pack('I', termios.TIOCM_RTS)
if state:
return fcntl.ioctl(self.fd, termios.TIOCMBIS, p)
else:
return fcntl.ioctl(self.fd, termios.TIOCMBIC, p)
The problem is I get responses like '\x01\x00\x00\x00', or
'\x02\x00\x00\x00' and I'm not sure what they mean. I tried doing
illogical things like settings CTS using the TIOCM_CTS flag and I end
up just getting back a slightly different binary packed 32 bit integer
(in that case '\x20\x00\x00\x00'). The above example has self.fd
being defined as os.open('/dev/ttyS0', os.O_RDWR | os.O_NONBLOCK).
Is someone familiar with manipulating serial signals like this in
python? Am I even taking the right approach by using the fcntl.ioctl
call? The environment is a ubuntu 8.04 distribution. Unfortunately
due to other limitations, I can't use/extend pyserial, though I would
like to.
I appreciate any advice on this matter,
Max
--
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Re: Recommend Commercial graphing library
AlienBaby matt.j.war...@gmail.com writes: I'd be grateful for any suggestions / pointers to something useful, Ignoring the commercial vs. open source discussion, although it was a few years ago, I found Chart Director (http://www.advsofteng.com/) to work very well, with plenty of platform and language support, including Python. -- David -- http://mail.python.org/mailman/listinfo/python-list
Re: Impersonating a Different Logon
Kevin Holleran kdaw...@gmail.com writes: Thanks, I was able to connect to the remote machine. However, how do I query for a very specific key value? I have to scan hundreds of machines and need want to reduce what I am querying. I would like to be able to scan a very specific key and report on its value. Any remote machine connection should automatically used any cached credentials for that machine, since Windows always uses the same credentials for a given target machine. So if you were to access a share with the appropriate credentials, using _winreg after that point should work. I normally use \\machine\ipc$ (even from the command line) which should always exist. You can use the wrappers in the PyWin32 library (win32net) to access and then release the share with NetUseAdd and NetUseDel. Of course, the extra step of accessing the share might or might not be any faster than WMI, but it would have a small advantage of not needing WMI support on the target machine - though that may be a non-issue nowadays. -- David -- http://mail.python.org/mailman/listinfo/python-list
remote multiprocessing, shared object
Should be a simple question, but I can't seem to make it work from my understanding of the docs. I want to use the multiprocessing module with remote clients, accessing shared lists. I gather one is supposed to use register(), but I don't see exactly how. I'd like to have the clients read and write the shared list directly, not via some kind of get() and set() functions. It's clear how to do this in a shared-memory setting, but how can one do it across a network, i.e. with serve_forever(), connect() etc.? Any help, especially with a concrete example, would be much appreciated. Thanks. Norm -- http://mail.python.org/mailman/listinfo/python-list
Regex driving me crazy...
Can someone make me un-crazy?
I have a bit of code that right now, looks like this:
status = getoutput('smartctl -l selftest /dev/sda').splitlines()[6]
status = re.sub(' (?= )(?=([^]*[^]*)*[^]*$)', :,status)
print status
Basically, it pulls the first actual line of data from the return you
get when you use smartctl to look at a hard disk's selftest log.
The raw data looks like this:
# 1 Short offline Completed without error 00% 679 -
Unfortunately, all that whitespace is arbitrary single space
characters. And I am interested in the string that appears in the
third column, which changes as the test runs and then completes. So
in the example, Completed without error
The regex I have up there doesn't quite work, as it seems to be
subbing EVERY space (or at least in instances of more than one space)
to a ':' like this:
# 1: Short offline:: Completed without error:: 00%:: 679 -
Ultimately, what I'm trying to do is either replace any space that is
one space wiht a delimiter, then split the result into a list and
get the third item.
OR, if there's a smarter, shorter, or better way of doing it, I'd love to know.
The end result should pull the whole string in the middle of that
output line, and then I can use that to compare to a list of possible
output strings to determine if the test is still running, has
completed successfully, or failed.
Unfortunately, my google-fu fails right now, and my Regex powers were
always rather weak anyway...
So any ideas on what the best way to proceed with this would be?
--
http://mail.python.org/mailman/listinfo/python-list
Re: Regex driving me crazy...
On 2010-04-07, J dreadpiratej...@gmail.com wrote: Can someone make me un-crazy? Definitely. Regex is driving you crazy, so don't use a regex. inputString = # 1 Short offline Completed without error 00% 679 - print ' '.join(inputString.split()[4:-3]) So any ideas on what the best way to proceed with this would be? Anytime you have a problem with a regex, the first thing you should ask yourself: do I really, _really_ need a regex? Hint: the answer is usually no. -- Grant Edwards grant.b.edwardsYow! I'm continually AMAZED at at th'breathtaking effects gmail.comof WIND EROSION!! -- http://mail.python.org/mailman/listinfo/python-list
Re: python as pen and paper substitute
On 04/06/2010 12:40 PM, Manuel Graune wrote: Hello everyone, I am looking for ways to use a python file as a substitute for simple pen and paper calculations. At the moment I mainly use a combination of triple-quoted strings, exec and print (Yes, I know it's not exactly elegant). This isn't quite along the lines that this thread is going, but it seems to me that a program like reinteract is about what I want to replace a pen and paper with a python-based thing. Last time I used it, it was buggy, but if this concept was developed, it would totally rock: http://fishsoup.net/software/reinteract/ -- http://mail.python.org/mailman/listinfo/python-list
order that destructors get called?
I'm used to C++ where destrcutors get called in reverse order of construction
like this:
{
Foo foo;
Bar bar;
// calls Bar::~Bar()
// calls Foo::~Foo()
}
I'm writing a ctypes wrapper for some native code, and I need to manage some
memory. I'm wrapping the memory in a python class that deletes the underlying
memory when the python class's reference count hits zero.
When doing this, I noticed some odd behaviour. I had code like this:
def delete_my_resource(res):
# deletes res
class MyClass(object):
def __del__(self):
delete_my_resource(self.res)
o = MyClass()
What happens is that as the program shuts down, delete_my_resource is released
*before* o is released. So when __del__ get called, delete_my_resource is now
None.
Obviously, MyClass needs to hang onto a reference to delete_my_resource.
What I'm wondering is if there's any documented order that reference counts
get decremented when a module is released or when a program terminates.
What I would expect is reverse order of definition but obviously that's not
the case.
Brendan
--
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Re: order that destructors get called?
On 2010-04-07 15:08:14 -0700, Brendan Miller said: When doing this, I noticed some odd behaviour. I had code like this: def delete_my_resource(res): # deletes res class MyClass(object): def __del__(self): delete_my_resource(self.res) o = MyClass() What happens is that as the program shuts down, delete_my_resource is released *before* o is released. So when __del__ get called, delete_my_resource is now None. The first thing Python does when shutting down is go and set the module-level value of any names to None; this may or may not cause those objects which were previously named such to be destroyed, depending on if it drops their reference count to 0. So if you need to call something in __del__, be sure to save its reference for later, so that when __del__ gets called, you can be sure the things you need are still alive. Perhaps on MyClass, in its __init__, or some such. What I'm wondering is if there's any documented order that reference counts get decremented when a module is released or when a program terminates. What I would expect is reverse order of definition but obviously that's not the case. AFAIR, every top level name gets set to None first; this causes many things to get recycled. There's no order beyond that, though. Namespaces are dictionaries, and dictionaries are unordered. So you can't really infer any sort of order to the destruction: if you need something to be alive when a certain __del__ is called, you have to keep a reference to it. -- --S ... p.s: change the .invalid to .com in email address to reply privately. -- http://mail.python.org/mailman/listinfo/python-list
Profiling: Interpreting tottime
Hello,
Consider the following function:
def check_s3_refcounts():
Check s3 object reference counts
global found_errors
log.info('Checking S3 object reference counts...')
for (key, refcount) in conn.query(SELECT id, refcount FROM s3_objects):
refcount2 = conn.get_val(SELECT COUNT(inode) FROM blocks WHERE
s3key=?,
(key,))
if refcount != refcount2:
log_error(S3 object %s has invalid refcount, setting from %d to
%d,
key, refcount, refcount2)
found_errors = True
if refcount2 != 0:
conn.execute(UPDATE s3_objects SET refcount=? WHERE id=?,
(refcount2, key))
else:
# Orphaned object will be picked up by check_keylist
conn.execute('DELETE FROM s3_objects WHERE id=?', (key,))
When I ran cProfile.Profile().runcall() on it, I got the following
result:
ncalls tottime percall cumtime percall filename:lineno(function)
1 7639.962 7639.962 7640.269 7640.269 fsck.py:270(check_s3_refcounts)
So according to the profiler, the entire 7639 seconds where spent
executing the function itself.
How is this possible? I really don't see how the above function can
consume any CPU time without spending it in one of the called
sub-functions.
Puzzled,
-Nikolaus
--
»Time flies like an arrow, fruit flies like a Banana.«
PGP fingerprint: 5B93 61F8 4EA2 E279 ABF6 02CF A9AD B7F8 AE4E 425C
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Re: pass object or use self.object?
On 04/07/10 18:34, Bruno Desthuilliers wrote:
Lie Ryan a écrit :
(snip)
Since in function in python is a first-class object, you can instead do
something like:
def process(document):
# note: document should encapsulate its own logic
document.do_one_thing()
Obvious case of encapsulation abuse here. Should a file object
encapsulate all the csv parsing logic ? (and the html parsing, xml
parsing, image manipulation etc...) ? Should a model object
encapsulate the presentation logic ? I could go on for hours here...
Yes, but no; you're taking it out of context. Is {csv|html|xml|image}
parsing logic a document's logic? Is presentation a document's logic? If
they're not, then they do not belong in document.
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help req: installing debugging symbols
Hi,I am using ununtu 9.10. I want to install a version of Python that was compiled with debug symbols.But if I delete python from ubuntu it would definitely stop working . And python comes preintalled in ubuntu without debugging symbols.How can i install python with debugging symbols ?Thanks.Regards,Sanam _ Hotmail: Trusted email with Microsoft’s powerful SPAM protection. https://signup.live.com/signup.aspx?id=60969-- http://mail.python.org/mailman/listinfo/python-list
ftp and python
Hi, I'm Py newbie and I have some beginners problems with ftp handling. What would be the easiest way to copy files from one ftp folder to another without downloading them to local system? Are there any snippets for this task (I couldnt find example like this) Thx _ Hotmail: Free, trusted and rich email service. https://signup.live.com/signup.aspx?id=60969-- http://mail.python.org/mailman/listinfo/python-list
Re: Striving for PEP-8 compliance
In message mailman.1599.1270652040.23598.python-l...@python.org, Tom Evans wrote: I've written a bunch of internal libraries for my company, and they all use two space indents, and I'd like to be more consistent and conform to PEP-8 as much as I can. “A foolish consistency is the hobgoblin of little minds” — Ralph Waldo Emerson -- http://mail.python.org/mailman/listinfo/python-list
Re: Striving for PEP-8 compliance
In message mailman.1610.1270655932.23598.python-l...@python.org, Gabriel Genellina wrote: If you only reindent the code (without adding/removing lines) then you can compare the compiled .pyc files (excluding the first 8 bytes that contain a magic number and the source file timestamp). Remember that code objects contain line number information. Anybody who ever creates another indentation-controlled language should be beaten to death with a Guido van Rossum voodoo doll. -- http://mail.python.org/mailman/listinfo/python-list
Re: Regex driving me crazy...
On Apr 7, 4:40 pm, J dreadpiratej...@gmail.com wrote:
Can someone make me un-crazy?
I have a bit of code that right now, looks like this:
status = getoutput('smartctl -l selftest /dev/sda').splitlines()[6]
status = re.sub(' (?= )(?=([^]*[^]*)*[^]*$)', :,status)
print status
Basically, it pulls the first actual line of data from the return you
get when you use smartctl to look at a hard disk's selftest log.
The raw data looks like this:
# 1 Short offline Completed without error 00% 679 -
Unfortunately, all that whitespace is arbitrary single space
characters. And I am interested in the string that appears in the
third column, which changes as the test runs and then completes. So
in the example, Completed without error
The regex I have up there doesn't quite work, as it seems to be
subbing EVERY space (or at least in instances of more than one space)
to a ':' like this:
# 1: Short offline:: Completed without error:: 00%:: 679 -
Ultimately, what I'm trying to do is either replace any space that is one
space wiht a delimiter, then split the result into a list and
get the third item.
OR, if there's a smarter, shorter, or better way of doing it, I'd love to
know.
The end result should pull the whole string in the middle of that
output line, and then I can use that to compare to a list of possible
output strings to determine if the test is still running, has
completed successfully, or failed.
Unfortunately, my google-fu fails right now, and my Regex powers were
always rather weak anyway...
So any ideas on what the best way to proceed with this would be?
You mean like this?
import re
re.split(' {2,}', '# 1 Short offline Completed without error
00%')
['# 1', 'Short offline', 'Completed without error', '00%']
Regards,
Pat
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Re: Regex driving me crazy...
On Apr 7, 4:47 pm, Grant Edwards inva...@invalid.invalid wrote:
On 2010-04-07, J dreadpiratej...@gmail.com wrote:
Can someone make me un-crazy?
Definitely. Regex is driving you crazy, so don't use a regex.
inputString = # 1 Short offline Completed without error 00%
679 -
print ' '.join(inputString.split()[4:-3])
So any ideas on what the best way to proceed with this would be?
Anytime you have a problem with a regex, the first thing you should
ask yourself: do I really, _really_ need a regex?
Hint: the answer is usually no.
--
Grant Edwards grant.b.edwards Yow! I'm continually AMAZED
at at th'breathtaking effects
gmail.com of WIND EROSION!!
OK, fine. Post a better solution to this problem than:
import re
re.split(' {2,}', '# 1 Short offline Completed without error
00%')
['# 1', 'Short offline', 'Completed without error', '00%']
Regards,
Pat
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Re: help req: installing debugging symbols
Install python in a different directory, use $prefix for that. Change PATH value accordingly 2010/4/5 sanam singh sanamsi...@hotmail.com Hi, I am using ununtu 9.10. I want to install a version of Python that was compiled with debug symbols. But if I delete python from ubuntu it would definitely stop working . And python comes preintalled in ubuntu without debuggi ng symbols. How can i install python with debugging symbols ? Thanks. Regards, Sanam -- Hotmail: Trusted email with Microsoft’s powerful SPAM protection. Sign up now. https://signup.live.com/signup.aspx?id=60969 -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: Regex driving me crazy...
On Apr 7, 7:49 pm, Patrick Maupin pmau...@gmail.com wrote:
On Apr 7, 4:40 pm, J dreadpiratej...@gmail.com wrote:
Can someone make me un-crazy?
I have a bit of code that right now, looks like this:
status = getoutput('smartctl -l selftest /dev/sda').splitlines()[6]
status = re.sub(' (?= )(?=([^]*[^]*)*[^]*$)', :,status)
print status
Basically, it pulls the first actual line of data from the return you
get when you use smartctl to look at a hard disk's selftest log.
The raw data looks like this:
# 1 Short offline Completed without error 00% 679
-
Unfortunately, all that whitespace is arbitrary single space
characters. And I am interested in the string that appears in the
third column, which changes as the test runs and then completes. So
in the example, Completed without error
The regex I have up there doesn't quite work, as it seems to be
subbing EVERY space (or at least in instances of more than one space)
to a ':' like this:
# 1: Short offline:: Completed without error:: 00%::
679 -
Ultimately, what I'm trying to do is either replace any space that is one
space wiht a delimiter, then split the result into a list and
get the third item.
OR, if there's a smarter, shorter, or better way of doing it, I'd love to
know.
The end result should pull the whole string in the middle of that
output line, and then I can use that to compare to a list of possible
output strings to determine if the test is still running, has
completed successfully, or failed.
Unfortunately, my google-fu fails right now, and my Regex powers were
always rather weak anyway...
So any ideas on what the best way to proceed with this would be?
You mean like this?
import re
re.split(' {2,}', '# 1 Short offline Completed without error
00%')
['# 1', 'Short offline', 'Completed without error', '00%']
Regards,
Pat
BTW, although I find it annoying when people say don't do that when
that is a perfectly good thing to do, and although I also find it
annoying when people tell you what not to do without telling you what
*to* do, and although I find the regex solution to this problem to be
quite clean, the equivalent non-regex solution is not terrible, so I
will present it as well, for your viewing pleasure:
[x for x in '# 1 Short offline Completed without error
00%'.split(' ') if x.strip()]
['# 1', 'Short offline', ' Completed without error', ' 00%']
Regards,
Pat
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Re: Striving for PEP-8 compliance
On Wed, Apr 7, 2010 at 5:35 PM, Lawrence D'Oliveiro @ wrote: In message mailman.1610.1270655932.23598.python-l...@python.org, Gabriel Genellina wrote: If you only reindent the code (without adding/removing lines) then you can compare the compiled .pyc files (excluding the first 8 bytes that contain a magic number and the source file timestamp). Remember that code objects contain line number information. Anybody who ever creates another indentation-controlled language should be beaten to death with a Guido van Rossum voodoo doll. I'll go warn Don Syme. :P I wonder how Microsoft will react. http://blogs.msdn.com/dsyme/archive/2006/08/24/715626.aspx Cheers, Chris -- http://blog.rebertia.com/2010/01/24/of-braces-and-semicolons/ -- http://mail.python.org/mailman/listinfo/python-list
Re: ftp and python
Matjaz Pfefferer wrote: What would be the easiest way to copy files from one ftp folder to another without downloading them to local system? As best I can tell, this isn't well-supported by FTP[1] which doesn't seem to have a native copy this file from server-location to server-location bypassing the client. There's a pair of RNFR/RNTO commands that allow you to rename (or perhaps move as well) a file which ftplib.FTP.rename() supports but it sounds like you want too copies. When I've wanted to do this, I've used a non-FTP method, usually SSH'ing into the server and just using cp. This could work for you if you have pycrypto/paramiko installed. Your last hope would be that your particular FTP server has some COPY extension that falls outside of RFC parameters -- something that's not a portable solution, but if you're doing a one-off script or something in a controlled environment, could work. Otherwise, you'll likely be stuck slurping the file down just to send it back up. -tkc [1] http://en.wikipedia.org/wiki/List_of_FTP_commands -- http://mail.python.org/mailman/listinfo/python-list
Re: Python and Regular Expressions
On Apr 7, 3:52 am, Chris Rebert c...@rebertia.com wrote: Regular expressions != Parsers True, but lots of parsers *use* regular expressions in their tokenizers. In fact, if you have a pure Python parser, you can often get huge performance gains by rearranging your code slightly so that you can use regular expressions in your tokenizer, because that effectively gives you access to a fast, specialized C library that is built into practically every Python interpreter on the planet. Every time someone tries to parse nested structures using regular expressions, Jamie Zawinski kills a puppy. And yet, if you are parsing stuff in Python, and your parser doesn't use some specialized C code for tokenization (which will probably be regular expressions unless you are using mxtexttools or some other specialized C tokenizer code), your nested structure parser will be dog slow. Now, for some applications, the speed just doesn't matter, and for people who don't yet know the difference between regexps and parsing, pointing them at PyParsing is certainly doing them a valuable service. But that's twice today when I've seen people warned off regular expressions without a cogent explanation that, while the re module is good at what it does, it really only handles the very lowest level of a parsing problem. My 2 cents is that something like PyParsing is absolutely great for people who want a simple parser without a lot of work. But if people use PyParsing, and then find out that (for their particular application) it isn't fast enough, and then wonder what to do about it, if all they remember is that somebody told them not to use regular expressions, they will just come to the false conclusion that pure Python is too painfully slow for any real world task. Regards, Pat -- http://mail.python.org/mailman/listinfo/python-list
Re: Performance of list vs. set equality operations
On Wed, 07 Apr 2010 10:55:10 -0700, Raymond Hettinger wrote: [Gustavo Nare] In other words: The more different elements two collections have, the faster it is to compare them as sets. And as a consequence, the more equivalent elements two collections have, the faster it is to compare them as lists. Is this correct? If two collections are equal, then comparing them as a set is always slower than comparing them as a list. Both have to call __eq__ for every element, but sets have to search for each element while lists can just iterate over consecutive pointers. If the two collections have unequal sizes, then both ways immediately return unequal. Perhaps I'm misinterpreting what you are saying, but I can't confirm that behaviour, at least not for subclasses of list: class MyList(list): ... def __len__(self): ... return self.n ... L1 = MyList(range(10)) L2 = MyList(range(10)) L1.n = 9 L2.n = 10 L1 == L2 True len(L1) == len(L2) False -- Steven -- http://mail.python.org/mailman/listinfo/python-list
Re: Performance of list vs. set equality operations
On Apr 7, 8:41 pm, Steven D'Aprano ste...@remove.this.cybersource.com.au wrote: On Wed, 07 Apr 2010 10:55:10 -0700, Raymond Hettinger wrote: [Gustavo Nare] In other words: The more different elements two collections have, the faster it is to compare them as sets. And as a consequence, the more equivalent elements two collections have, the faster it is to compare them as lists. Is this correct? If two collections are equal, then comparing them as a set is always slower than comparing them as a list. Both have to call __eq__ for every element, but sets have to search for each element while lists can just iterate over consecutive pointers. If the two collections have unequal sizes, then both ways immediately return unequal. Perhaps I'm misinterpreting what you are saying, but I can't confirm that behaviour, at least not for subclasses of list: class MyList(list): ... def __len__(self): ... return self.n ... L1 = MyList(range(10)) L2 = MyList(range(10)) L1.n = 9 L2.n = 10 L1 == L2 True len(L1) == len(L2) False -- Steven I think what he is saying is that the list __eq__ method will look at the list lengths first. This may or may not be considered a subtle bug for the edge case you are showing. If I do the following: L1 = range(1000) L2 = range(1000) L3 = range(1001) L1 == L2 True L1 == L3 False I don't even need to run timeit -- the True takes awhile to print out, while the False prints out immediately. Regards, Pat -- http://mail.python.org/mailman/listinfo/python-list
Re: Regex driving me crazy...
Patrick Maupin wrote:
BTW, although I find it annoying when people say don't do that when
that is a perfectly good thing to do, and although I also find it
annoying when people tell you what not to do without telling you what
*to* do, and although I find the regex solution to this problem to be
quite clean, the equivalent non-regex solution is not terrible
I propose a new way to answer questions on c.l.python that will (1) give
respondents the pleasure of vague admonishment and (2) actually answer the
question. The way I propose utilizes the double negative. For example:
You are doing it wrong! Don't not do codere.split('\s{2,}', s[2])/code.
Please answer this way in the future.
Thank you,
James
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Re: Regex driving me crazy...
On Apr 7, 9:02 pm, James Stroud nospamjstroudmap...@mbi.ucla.edu
wrote:
Patrick Maupin wrote:
BTW, although I find it annoying when people say don't do that when
that is a perfectly good thing to do, and although I also find it
annoying when people tell you what not to do without telling you what
*to* do, and although I find the regex solution to this problem to be
quite clean, the equivalent non-regex solution is not terrible
I propose a new way to answer questions on c.l.python that will (1) give
respondents the pleasure of vague admonishment and (2) actually answer the
question. The way I propose utilizes the double negative. For example:
You are doing it wrong! Don't not do codere.split('\s{2,}', s[2])/code.
Please answer this way in the future.
I most certainly will not consider when that isn't warranted!
OTOH, in general I am more interested in admonishing the authors of
the pseudo-answers than I am the authors of the questions, despite the
fact that I find this hilarious:
http://despair.com/cluelessness.html
Regards,
Pat
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Re: Regex driving me crazy...
On 2010-04-08, Patrick Maupin pmau...@gmail.com wrote:
On Apr 7, 4:47?pm, Grant Edwards inva...@invalid.invalid wrote:
On 2010-04-07, J dreadpiratej...@gmail.com wrote:
Can someone make me un-crazy?
Definitely. ?Regex is driving you crazy, so don't use a regex.
? inputString = # 1 ?Short offline ? ? ? Completed without error ? ? 00% ?
? ? 679 ? ? ? ? -
? print ' '.join(inputString.split()[4:-3])
[...]
OK, fine. Post a better solution to this problem than:
import re
re.split(' {2,}', '# 1 Short offline Completed without error
00%')
['# 1', 'Short offline', 'Completed without error', '00%']
OK, I'll bite: what's wrong with the solution I already posted?
--
Grant
--
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Re: Regex driving me crazy...
On 2010-04-08, James Stroud nospamjstroudmap...@mbi.ucla.edu wrote:
Patrick Maupin wrote:
BTW, although I find it annoying when people say don't do that when
that is a perfectly good thing to do, and although I also find it
annoying when people tell you what not to do without telling you what
*to* do, and although I find the regex solution to this problem to be
quite clean, the equivalent non-regex solution is not terrible
I propose a new way to answer questions on c.l.python that will (1) give
respondents the pleasure of vague admonishment and (2) actually answer the
question. The way I propose utilizes the double negative. For example:
You are doing it wrong! Don't not do codere.split('\s{2,}', s[2])/code.
Please answer this way in the future.
I will certain try to avoid not answering in a manner not unlike that.
--
Grant
--
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Re: Regex driving me crazy...
On Apr 7, 9:36 pm, Grant Edwards inva...@invalid.invalid wrote:
On 2010-04-08, Patrick Maupin pmau...@gmail.com wrote: On Apr 7, 4:47?pm,
Grant Edwards inva...@invalid.invalid wrote:
On 2010-04-07, J dreadpiratej...@gmail.com wrote:
Can someone make me un-crazy?
Definitely. ?Regex is driving you crazy, so don't use a regex.
? inputString = # 1 ?Short offline ? ? ? Completed without error ? ? 00%
? ? ? 679 ? ? ? ? -
? print ' '.join(inputString.split()[4:-3])
[...]
OK, fine. Post a better solution to this problem than:
import re
re.split(' {2,}', '# 1 Short offline Completed without error
00%')
['# 1', 'Short offline', 'Completed without error', '00%']
OK, I'll bite: what's wrong with the solution I already posted?
--
Grant
Sorry, my eyes completely missed your one-liner, so my criticism about
not posting a solution was unwarranted. I don't think you and I read
the problem the same way (which is probably why I didn't notice your
solution -- because it wasn't solving the problem I thought I saw).
When I saw And I am interested in the string that appears in the
third column, which changes as the test runs and then completes I
assumed that, not only could that string change, but so could the one
before it.
I guess my base assumption that anything with words in it could
change. I was looking at the OP's attempt at a solution, and he
obviously felt he needed to see two or more spaces as an item
delimiter.
(And I got testy because of seeing other IMO unwarranted denigration
of re on the list lately.)
Regards,
Pat
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Re: Regex driving me crazy...
On Wed, 07 Apr 2010 18:03:47 -0700, Patrick Maupin wrote:
BTW, although I find it annoying when people say don't do that when
that is a perfectly good thing to do, and although I also find it
annoying when people tell you what not to do without telling you what
*to* do,
Grant did give a perfectly good solution.
and although I find the regex solution to this problem to be
quite clean, the equivalent non-regex solution is not terrible, so I
will present it as well, for your viewing pleasure:
[x for x in '# 1 Short offline Completed without error
00%'.split(' ') if x.strip()]
['# 1', 'Short offline', ' Completed without error', ' 00%']
This is one of the reasons we're so often suspicious of re solutions:
s = '# 1 Short offline Completed without error 00%'
tre = Timer(re.split(' {2,}', s),
... import re; from __main__ import s)
tsplit = Timer([x for x in s.split(' ') if x.strip()],
... from __main__ import s)
re.split(' {2,}', s) == [x for x in s.split(' ') if x.strip()]
True
min(tre.repeat(repeat=5))
6.1224789619445801
min(tsplit.repeat(repeat=5))
1.8338048458099365
Even when they are correct and not unreadable line-noise, regexes tend to
be slow. And they get worse as the size of the input increases:
s *= 1000
min(tre.repeat(repeat=5, number=1000))
2.3496899604797363
min(tsplit.repeat(repeat=5, number=1000))
0.41538596153259277
s *= 10
min(tre.repeat(repeat=5, number=1000))
23.739185094833374
min(tsplit.repeat(repeat=5, number=1000))
4.6444299221038818
And this isn't even one of the pathological O(N**2) or O(2**N) regexes.
Don't get me wrong -- regexes are a useful tool. But if your first
instinct is to write a regex, you're doing it wrong.
[quote]
A related problem is Perl's over-reliance on regular expressions
that is exaggerated by advocating regex-based solution in almost
all O'Reilly books. The latter until recently were the most
authoritative source of published information about Perl.
While simple regular expression is a beautiful thing and can
simplify operations with string considerably, overcomplexity in
regular expressions is extremly dangerous: it cannot serve a basis
for serious, professional programming, it is fraught with pitfalls,
a big semantic mess as a result of outgrowing its primary purpose.
Diagnostic for errors in regular expressions is even weaker then
for the language itself and here many things are just go unnoticed.
[end quote]
http://www.softpanorama.org/Scripting/Perlbook/Ch01/
place_of_perl_among_other_lang.shtml
Even Larry Wall has criticised Perl's regex culture:
http://dev.perl.org/perl6/doc/design/apo/A05.html
--
Steven
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Re: Regex driving me crazy...
On Wed, Apr 7, 2010 at 22:45, Patrick Maupin pmau...@gmail.com wrote: When I saw And I am interested in the string that appears in the third column, which changes as the test runs and then completes I assumed that, not only could that string change, but so could the one before it. I guess my base assumption that anything with words in it could change. I was looking at the OP's attempt at a solution, and he obviously felt he needed to see two or more spaces as an item delimiter. I apologize for the confusion, Pat... I could have worded that better, but at that point I was A: Frustrated, B: starving, and C: had my wife nagging me to stop working to come get something to eat ;-) What I meant was, in that output string, the phrase in the middle could change in length... After looking at the source code for smartctl (part of the smartmontools package for you linux people) I found the switch that creates those status messages they vary in character length, some with non-text characters like ( and ) and /, and have either 3 or 4 words... The spaces between each column, instead of being a fixed number of spaces each, were seemingly arbitrarily created... there may be 4 spaces between two columns or there may be 9, or 7 or who knows what, and since they were all being treated as individual spaces instead of tabs or something, I was having trouble splitting the output into something that was easy to parse (at least in my mind it seemed that way). Anyway, that's that... and I do apologize if my original post was confusing at all... Cheers Jeff -- http://mail.python.org/mailman/listinfo/python-list
Re: Regex driving me crazy...
On Apr 7, 9:51 pm, Steven D'Aprano
ste...@remove.this.cybersource.com.au wrote:
On Wed, 07 Apr 2010 18:03:47 -0700, Patrick Maupin wrote:
BTW, although I find it annoying when people say don't do that when
that is a perfectly good thing to do, and although I also find it
annoying when people tell you what not to do without telling you what
*to* do,
Grant did give a perfectly good solution.
Yeah, I noticed later and apologized for that. What he gave will work
perfectly if the only data that changes the number of words is the
data the OP is looking for. This may or may not be true. I don't
know anything about the program generating the data, but I did notice
that the OP's attempt at an answer indicated that the OP felt (rightly
or wrongly) he needed to split on two or more spaces.
and although I find the regex solution to this problem to be
quite clean, the equivalent non-regex solution is not terrible, so I
will present it as well, for your viewing pleasure:
[x for x in '# 1 Short offline Completed without error
00%'.split(' ') if x.strip()]
['# 1', 'Short offline', ' Completed without error', ' 00%']
This is one of the reasons we're so often suspicious of re solutions:
s = '# 1 Short offline Completed without error 00%'
tre = Timer(re.split(' {2,}', s),
... import re; from __main__ import s) tsplit = Timer([x for x in
s.split(' ') if x.strip()],
... from __main__ import s)
re.split(' {2,}', s) == [x for x in s.split(' ') if x.strip()]
True
min(tre.repeat(repeat=5))
6.1224789619445801
min(tsplit.repeat(repeat=5))
1.8338048458099365
Even when they are correct and not unreadable line-noise, regexes tend to
be slow. And they get worse as the size of the input increases:
s *= 1000
min(tre.repeat(repeat=5, number=1000))
2.3496899604797363
min(tsplit.repeat(repeat=5, number=1000))
0.41538596153259277
s *= 10
min(tre.repeat(repeat=5, number=1000))
23.739185094833374
min(tsplit.repeat(repeat=5, number=1000))
4.6444299221038818
And this isn't even one of the pathological O(N**2) or O(2**N) regexes.
Don't get me wrong -- regexes are a useful tool. But if your first
instinct is to write a regex, you're doing it wrong.
[quote]
A related problem is Perl's over-reliance on regular expressions
that is exaggerated by advocating regex-based solution in almost
all O'Reilly books. The latter until recently were the most
authoritative source of published information about Perl.
While simple regular expression is a beautiful thing and can
simplify operations with string considerably, overcomplexity in
regular expressions is extremly dangerous: it cannot serve a basis
for serious, professional programming, it is fraught with pitfalls,
a big semantic mess as a result of outgrowing its primary purpose.
Diagnostic for errors in regular expressions is even weaker then
for the language itself and here many things are just go unnoticed.
[end quote]
http://www.softpanorama.org/Scripting/Perlbook/Ch01/
place_of_perl_among_other_lang.shtml
Even Larry Wall has criticised Perl's regex culture:
http://dev.perl.org/perl6/doc/design/apo/A05.html
Bravo!!! Good data, quotes, references, all good stuff!
I absolutely agree that regex shouldn't always be the first thing you
reach for, but I was reading way too much unsubstantiated this is
bad. Don't do it. on the subject recently. In particular, when
people say Don't use regex. Use PyParsing! It may be good advice
in the right context, but it's a bit disingenuous not to mention that
PyParsing will use regex under the covers...
Regards,
Pat
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Re: Tkinter inheritance mess?
On 5 avr, 22:32, Lie Ryan lie.1...@gmail.com wrote:
On 04/06/10 02:38, ejetzer wrote:
On 5 avr, 12:36, ejetzer ejet...@gmail.com wrote:
For a school project, I'm trying to make a minimalist web browser, and
I chose to use Tk as the rendering toolkit. I made my parser classes
into Tkinter canvases, so that I would only have to call pack and
mainloop functions in order to display the rendering. Right now, two
bugs are affecting the program :
1) When running the full app¹, which fetches a document and then
attempts to display it, I get a TclError :
_tkinter.TclError: bad window path name {Extensible
Markup Language (XML) 1.0 (Fifth Edition)}
2) When running only the parsing and rendering test², I get a big
window to open, with nothing displayed. I am not quite familiar with
Tk, so I have no idea of why it acts that way.
1: webbrowser.py
2: xmlparser.py
I just realized I haven't included the Google Code project url :
http://code.google.com/p/smally-browser/source/browse/#svn/trunk
Check your indentation xmlparser.py in line 63 to 236, are they supposed
to be correct?
Yes, these are functions that are used exclusively inside the feed
function, so I decided to restrict their namespace. I just realized it
could be confusing, so I placed them in global namsespace.
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Re: Regex driving me crazy...
On 2010-04-08, Patrick Maupin pmau...@gmail.com wrote: Sorry, my eyes completely missed your one-liner, so my criticism about not posting a solution was unwarranted. I don't think you and I read the problem the same way (which is probably why I didn't notice your solution -- because it wasn't solving the problem I thought I saw). No worries. When I saw And I am interested in the string that appears in the third column, which changes as the test runs and then completes I assumed that, not only could that string change, but so could the one before it. If that's the case, my solution won't work right. I guess my base assumption that anything with words in it could change. I was looking at the OP's attempt at a solution, and he obviously felt he needed to see two or more spaces as an item delimiter. If the requirement is indeed two or more spaces as a delimiter with spaces allowed in any field, then a regular expression split is probably the best solution. -- Grant -- http://mail.python.org/mailman/listinfo/python-list
Re: Performance of list vs. set equality operations
[Raymond Hettinger]
If the two collections have unequal sizes, then both ways immediately
return unequal.
[Steven D'Aprano]
Perhaps I'm misinterpreting what you are saying, but I can't confirm that
behaviour, at least not for subclasses of list:
For doubters, see list_richcompare() in
http://svn.python.org/view/python/trunk/Objects/listobject.c?revision=78522view=markup
if (Py_SIZE(vl) != Py_SIZE(wl) (op == Py_EQ || op == Py_NE)) {
/* Shortcut: if the lengths differ, the lists differ */
PyObject *res;
if (op == Py_EQ)
res = Py_False;
else
res = Py_True;
Py_INCREF(res);
return res;
}
And see set_richcompare() in
http://svn.python.org/view/python/trunk/Objects/setobject.c?revision=78886view=markup
case Py_EQ:
if (PySet_GET_SIZE(v) != PySet_GET_SIZE(w))
Py_RETURN_FALSE;
if (v-hash != -1
((PySetObject *)w)-hash != -1
v-hash != ((PySetObject *)w)-hash)
Py_RETURN_FALSE;
return set_issubset(v, w);
Raymond
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Re: Regex driving me crazy...
On Apr 7, 9:51 pm, Steven D'Aprano
ste...@remove.this.cybersource.com.au wrote:
This is one of the reasons we're so often suspicious of re solutions:
s = '# 1 Short offline Completed without error 00%'
tre = Timer(re.split(' {2,}', s),
... import re; from __main__ import s) tsplit = Timer([x for x in
s.split(' ') if x.strip()],
... from __main__ import s)
re.split(' {2,}', s) == [x for x in s.split(' ') if x.strip()]
True
min(tre.repeat(repeat=5))
6.1224789619445801
min(tsplit.repeat(repeat=5))
1.8338048458099365
I will confess that, in my zeal to defend re, I gave a simple one-
liner, rather than the more optimized version:
from timeit import Timer
s = '# 1 Short offline Completed without error 00%'
tre = Timer(splitter(s),
... import re; from __main__ import s; splitter =
re.compile(' {2,}').split)
tsplit = Timer([x for x in s.split(' ') if x.strip()],
... from __main__ import s)
min(tre.repeat(repeat=5))
1.893190860748291
min(tsplit.repeat(repeat=5))
2.0661051273345947
You're right that if you have an 800K byte string, re doesn't perform
as well as split, but the delta is only a few percent.
s *= 1
min(tre.repeat(repeat=5, number=1000))
15.331652164459229
min(tsplit.repeat(repeat=5, number=1000))
14.596404075622559
Regards,
Pat
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Re: [Q] raise exception with fake filename and linenumber
En Wed, 07 Apr 2010 17:23:22 -0300, kwatch kwa...@gmail.com escribió:
Is it possible to raise exception with custom traceback to specify
file and line?
I'm creating a certain parser.
I want to report syntax error with the same format as other exception.
-
1: def parse(filename):
2: if something_is_wrong():
3: linenum = 123
4: raise Exception(syntax error on %s, line %s % (filename,
linenum))
5:
6: parse('example.file')
-
my hope is:
-
Traceback (most recent call last):
File /tmp/parser.py, line 6, in module
parse('example.file')
File /tmp/parser.py, line 4, in parse
raise Exception(syntax error on %s, line %s % (filename,
linenum))
File /tmp/example.file, line 123
foreach item in items # wrong syntax line
Exception: syntax error
-
The built-in SyntaxError exception does what you want. Constructor
parameters are undocumented, but they're as follows:
raise SyntaxError(A descriptive error message, (filename, linenum,
colnum, source_line))
colnum is used to place the ^ symbol (10 in this fake example). Output:
Traceback (most recent call last):
File 1.py, line 9, in module
foo()
File 1.py, line 7, in foo
raise SyntaxError(A descriptive error message, (filename, linenum,
colnum, this is line 123 in example.file))
File example.file, line 123
this is line 123 in example.file
^
SyntaxError: A descriptive error message
--
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Re: Profiling: Interpreting tottime
En Wed, 07 Apr 2010 18:44:39 -0300, Nikolaus Rath nikol...@rath.org
escribió:
def check_s3_refcounts():
Check s3 object reference counts
global found_errors
log.info('Checking S3 object reference counts...')
for (key, refcount) in conn.query(SELECT id, refcount FROM
s3_objects):
refcount2 = conn.get_val(SELECT COUNT(inode) FROM blocks WHERE
s3key=?,
(key,))
if refcount != refcount2:
log_error(S3 object %s has invalid refcount, setting from
%d to %d,
key, refcount, refcount2)
found_errors = True
if refcount2 != 0:
conn.execute(UPDATE s3_objects SET refcount=? WHERE
id=?,
(refcount2, key))
else:
# Orphaned object will be picked up by check_keylist
conn.execute('DELETE FROM s3_objects WHERE id=?', (key,))
When I ran cProfile.Profile().runcall() on it, I got the following
result:
ncalls tottime percall cumtime percall filename:lineno(function)
1 7639.962 7639.962 7640.269 7640.269
fsck.py:270(check_s3_refcounts)
So according to the profiler, the entire 7639 seconds where spent
executing the function itself.
How is this possible? I really don't see how the above function can
consume any CPU time without spending it in one of the called
sub-functions.
Is the conn object implemented as a C extension? The profiler does not
detect calls to C functions, I think.
You may be interested in this package by Robert Kern:
http://pypi.python.org/pypi/line_profiler
Line-by-line profiler.
line_profiler will profile the time individual lines of code take to
execute.
--
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--
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Re: Profiling: Interpreting tottime
En Wed, 07 Apr 2010 18:44:39 -0300, Nikolaus Rath nikol...@rath.org
escribió:
def check_s3_refcounts():
Check s3 object reference counts
global found_errors
log.info('Checking S3 object reference counts...')
for (key, refcount) in conn.query(SELECT id, refcount FROM
s3_objects):
refcount2 = conn.get_val(SELECT COUNT(inode) FROM blocks WHERE
s3key=?,
(key,))
if refcount != refcount2:
log_error(S3 object %s has invalid refcount, setting from
%d to %d,
key, refcount, refcount2)
found_errors = True
if refcount2 != 0:
conn.execute(UPDATE s3_objects SET refcount=? WHERE
id=?,
(refcount2, key))
else:
# Orphaned object will be picked up by check_keylist
conn.execute('DELETE FROM s3_objects WHERE id=?', (key,))
When I ran cProfile.Profile().runcall() on it, I got the following
result:
ncalls tottime percall cumtime percall filename:lineno(function)
1 7639.962 7639.962 7640.269 7640.269
fsck.py:270(check_s3_refcounts)
So according to the profiler, the entire 7639 seconds where spent
executing the function itself.
How is this possible? I really don't see how the above function can
consume any CPU time without spending it in one of the called
sub-functions.
Is the conn object implemented as a C extension? The profiler does not
detect calls to C functions, I think.
You may be interested in this package by Robert Kern:
http://pypi.python.org/pypi/line_profiler
Line-by-line profiler.
line_profiler will profile the time individual lines of code take to
execute.
--
Gabriel Genellina
--
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The Regex Story
On 04/08/10 12:45, Patrick Maupin wrote: (And I got testy because of seeing other IMO unwarranted denigration of re on the list lately.) Why am I seeing a lot of this pattern lately: OP: Got problem with string +- A: Suggested a regex-based solution +- B: Quoted Some people ... regex ... two problems. or OP: Writes some regex, found problem +- A: Quoted Some people ... regex ... two problems. +- B: Supplied regex-based solution, clean one +- A: Suggested PyParsing (or similar) -- http://mail.python.org/mailman/listinfo/python-list
Re: Regex driving me crazy...
On Apr 7, 9:51 pm, Steven D'Aprano
ste...@remove.this.cybersource.com.au wrote:
BTW, I don't know how you got 'True' here.
re.split(' {2,}', s) == [x for x in s.split(' ') if x.strip()]
True
You must not have s set up to be the string given by the OP. I just
realized there was an error in my non-regexp example, that actually
manifests itself with the test data:
import re
s = '# 1 Short offline Completed without error 00%'
re.split(' {2,}', s)
['# 1', 'Short offline', 'Completed without error', '00%']
[x for x in s.split(' ') if x.strip()]
['# 1', 'Short offline', ' Completed without error', ' 00%']
re.split(' {2,}', s) == [x for x in s.split(' ') if x.strip()]
False
To fix it requires something like:
[x.strip() for x in s.split(' ') if x.strip()]
or:
[x for x in [x.strip() for x in s.split(' ')] if x]
I haven't timed either one of these, but given that the broken
original one was slower than the simpler:
splitter = re.compile(' {2,}').split
splitter(s)
on strings of normal length, and given that nobody noticed this bug
right away (even though it was in the printout on my first message,
heh), I think that this shows that (here, let me qualify this
carefully), at least in some cases, the first regexp that comes to my
mind can be prettier, shorter, faster, less bug-prone, etc. than the
first non-regexp that comes to my mind...
Regards,
Pat
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Re: order that destructors get called?
En Wed, 07 Apr 2010 19:08:14 -0300, Brendan Miller catph...@catphive.net
escribió:
I'm used to C++ where destrcutors get called in reverse order of
construction
like this:
{
Foo foo;
Bar bar;
// calls Bar::~Bar()
// calls Foo::~Foo()
}
That behavior is explicitly guaranteed by the C++ language. Python does
not have such guarantees -- destructors may be delayed an arbitrary amount
of time, or even not called at all.
In contrast, Python does have a `try/finally` construct, and the `with`
statement. If Foo and Bar implement adequate __enter__ and __exit__
methods, the above code would become:
with Foo() as foo:
with Bar() as bar:
# do something
On older Python versions it is more verbose:
foo = Foo()
try:
bar = Bar()
try:
# do something
finally:
bar.release_resources()
finally:
foo.release_resources()
I'm writing a ctypes wrapper for some native code, and I need to manage
some
memory. I'm wrapping the memory in a python class that deletes the
underlying
memory when the python class's reference count hits zero.
If the Python object lifetime is tied to certain lexical scope (like the
foo,bar local variables in your C++ example) you may use `with` or
`finally` as above.
If some other object with a longer lifetime keeps a reference, see below.
When doing this, I noticed some odd behaviour. I had code like this:
def delete_my_resource(res):
# deletes res
class MyClass(object):
def __del__(self):
delete_my_resource(self.res)
o = MyClass()
What happens is that as the program shuts down, delete_my_resource is
released
*before* o is released. So when __del__ get called, delete_my_resource
is now
None.
Implementing __del__ is not always a good idea; among other things, the
garbage collector cannot break a cycle if any involved object contains a
__del__ method. [1]
If you still want to implement __del__, keep a reference to
delete_my_resource in the method itself:
def __del__(self,
delete_my_resource=delete_my_resource):
delete_my_resource(self.res)
(and do the same with any global name that delete_my_resource itself may
reference).
The best approach is to store a weak reference to foo and bar somewhere;
weak references are notified right before the referent is destroyed. [4]
And last, if you want to release something when the program terminates,
you may use the atexit module.
What I'm wondering is if there's any documented order that reference
counts
get decremented when a module is released or when a program terminates.
Not much, as Stephen Hansen already told you; but see the comments in
PyImport_Cleanup function in import.c [2] and in _PyModule_Clear in
moduleobject.c [3]
Standard disclaimer: these undocumented details only apply to the current
version of CPython, may change in future releases, and are not applicable
at all to other implementations. So it's not a good idea to rely on this
behavior.
[1] http://docs.python.org/reference/datamodel.html#object.__del__
[2] http://svn.python.org/view/python/trunk/Python/import.c?view=markup
[3]
http://svn.python.org/view/python/trunk/Objects/moduleobject.c?view=markup
[4] http://docs.python.org/library/weakref.html
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Simple Cookie Script: Not recognising Cookie
Hi I have a simple Python program that assigns a cookie to a web user
when they open the script the 1st time(in an internet browser). If
they open the script a second time the script should display the line
You have been here 2 times. , if they open the script agai it
should show on the webpage You have been here 3 times and so on.
But for some reason, my program is not assigning or recognising an
assigned cookie outputing the line You have been here x times. I
have gone over my code for like 2 hours now I cant figure out what is
going wrong??
Can you help me figure out whats wrong? I have my own cgi server that
just runs on my machine so its not that its the code to recognise/
assign a cookie
[code]#!/usr/bin/env python
import Cookie
import cgi
import os
HTML_template =
html
head
/head
body
p %s /p
/body
/html
def main():
# Web Client is new to the site so we need to assign a cookie to
them
cookie = Cookie.SimpleCookie()
cookie['SESSIONID'] = '1'
code = No cookie exists. Welcome, this is your first visit.
if 'HTTP_COOKIE' in os.environ:
cookie = Cookie.SimpleCookie(os.environ['HTTP_COOKIE'])
# If Web client has been here before
if cookie.has_key('SESSIONID'):
cookie['SESSIONID'].value = int(cookie['SESSIONID'].value)
+1
code = You have been here %s times. %
cookie['SESSIONID'].value
else:
cookie = Cookie.SimpleCookie()
cookie['SESSIONID'] = '1'
code = I Have a cookie, but SESSIONID does not exist
print Content-Type: text/html\n
print HTML_template % code
if __name__ == __main__:
main()
[/code]
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Re: ftp and python
Tim Chase wrote: Matjaz Pfefferer wrote: What would be the easiest way to copy files from one ftp folder to another without downloading them to local system? As best I can tell, this isn't well-supported by FTP[1] which doesn't seem to have a native copy this file from server-location to server-location bypassing the client. There's a pair of RNFR/RNTO commands that allow you to rename (or perhaps move as well) a file which ftplib.FTP.rename() supports but it sounds like you want too copies. In theory, the FTP spec supports three-way transfers, where the source, destination, and control can all be on different machines. But no modern implementation supports that. John Nagle -- http://mail.python.org/mailman/listinfo/python-list
Re: remote multiprocessing, shared object
On Thu, Apr 8, 2010 at 3:04 AM, Norm Matloff matl...@doe.com wrote:
Should be a simple question, but I can't seem to make it work from my
understanding of the docs.
I want to use the multiprocessing module with remote clients, accessing
shared lists. I gather one is supposed to use register(), but I don't
see exactly how. I'd like to have the clients read and write the shared
list directly, not via some kind of get() and set() functions. It's
clear how to do this in a shared-memory setting, but how can one do it
across a network, i.e. with serve_forever(), connect() etc.?
Any help, especially with a concrete example, would be much appreciated.
Thanks.
There's an example in the multiprocessing documentation.
http://docs.python.org/library/multiprocessing.html#using-a-remote-manager
It creates a shared queue, but it's easy to modify for lists.
For example, here's your shared list server:
from multiprocessing.managers import BaseManager
shared_list = []
class ListManager(BaseManager): pass
ListManager.register('get_list', callable=lambda:shared_list)
m = ListManager(address=('', 5), authkey='abracadabra')
s = m.get_server()
s.serve_forever()
A client that adds an element to your shared list:
import random
from multiprocessing.managers import BaseManager
class ListManager(BaseManager): pass
ListManager.register('get_list')
m = ListManager(address=('localhost', 5), authkey='abracadabra')
m.connect()
l = m.get_list()
l.append(random.random())
And a client that prints out the shared list:
from multiprocessing.managers import BaseManager
class ListManager(BaseManager): pass
ListManager.register('get_list')
m = ListManager(address=('localhost', 5), authkey='abracadabra')
m.connect()
l = m.get_list()
print str(l)
--
regards,
kushal
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Re: Regex driving me crazy...
On Thu, Apr 8, 2010 at 3:10 AM, J dreadpiratej...@gmail.com wrote:
Can someone make me un-crazy?
I have a bit of code that right now, looks like this:
status = getoutput('smartctl -l selftest /dev/sda').splitlines()[6]
status = re.sub(' (?= )(?=([^]*[^]*)*[^]*$)', :,status)
print status
Basically, it pulls the first actual line of data from the return you
get when you use smartctl to look at a hard disk's selftest log.
The raw data looks like this:
# 1 Short offline Completed without error 00% 679 -
Unfortunately, all that whitespace is arbitrary single space
characters. And I am interested in the string that appears in the
third column, which changes as the test runs and then completes. So
in the example, Completed without error
The regex I have up there doesn't quite work, as it seems to be
subbing EVERY space (or at least in instances of more than one space)
to a ':' like this:
# 1: Short offline:: Completed without error:: 00%:: 679 -
Ultimately, what I'm trying to do is either replace any space that is
one space wiht a delimiter, then split the result into a list and
get the third item.
OR, if there's a smarter, shorter, or better way of doing it, I'd love to
know.
The end result should pull the whole string in the middle of that
output line, and then I can use that to compare to a list of possible
output strings to determine if the test is still running, has
completed successfully, or failed.
Is there any particular reason you absolutely must extract the status
message? If you already have a list of possible status messages, you
could just test which one of those is present in the line...
Unfortunately, my google-fu fails right now, and my Regex powers were
always rather weak anyway...
So any ideas on what the best way to proceed with this would be?
--
regards,
kushal
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[issue4570] Bad example in set tutorial
Changes by Kelda kel...@gmail.com: Removed file: http://bugs.python.org/file16790/datastructures.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue4570 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7559] TestLoader.loadTestsFromName swallows import errors
Chris Jerdonek chris.jerdo...@gmail.com added the comment: Rietveld link: http://codereview.appspot.com/810044/show This patch changes unittest.TestLoader.loadTestsFromName() so that ImportErrors will bubble up when importing from a module with a bad import statement. Before the method raised an AttributeError. The unit test code is taken from a patch by Salman Haq. The patch also includes code adapted from http://twistedmatrix.com . (This is my first patch, so any guidance is greatly appreciated. Thanks.) -- Added file: http://bugs.python.org/file16796/_patch-7559-3.diff ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7559 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue7301] Add environment variable $PYTHONWARNINGS
Philip Jenvey pjen...@underboss.org added the comment: I committed a somewhat different version of this patch to py3k to handle the warn options now calling for wchars, but this needs more work. Some of the buildbots are unhappy Seems like the py3k version either needs to fully decode the env values to a unicode obj via the file system encoding (which I doubt is initialized at this point)/surrogateescape, or use something along the lines of char2wchar in python.c -- assignee: - pjenvey resolution: fixed - accepted status: closed - open ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue7301 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8327] unintuitive behaviour of logging message propagation
Pascal Chambon chambon.pas...@gmail.com added the comment: Thanks for the doc patch, if you don't mind I'd just add the paragraph below too, to clarify the fact that logger levels are only entry points levels, ignored he rest of the time. There might be slight redundancies with the rest of the (long) documentation, but it's all benefit imo. B-) In addition to any handlers directly associated with a logger, *all handlers associated with all ancestors of the logger* are called to dispatch the message (unless the *propagate* flag for a logger is set to a false value, at which point the passing to ancestor handlers stops). Note that in this process, the level of ancestor loggers is never considered : only their *propagate* attribute and the levels of their loggers canimpact the treatment on the message being dispatched. The level of a logger is thus only acting as an *entry point barrier*, only able to stop the whole dispatch of a message that enters the system through it. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8327 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8271] str.decode('utf8', 'replace') -- conformance with Unicode 5.2.0
Marc-Andre Lemburg m...@egenix.com added the comment: STINNER Victor wrote: STINNER Victor victor.stin...@haypocalc.com added the comment: I also found out that, according to RFC 3629, surrogates are considered invalid and they can't be encoded/decoded, but the UTF-8 codec actually does it. Python2 does, but Python3 raises an error. Python 2.7a4+ (trunk:79675, Apr 3 2010, 16:11:36) u\uDC80.encode(utf8) '\xed\xb2\x80' Python 3.2a0 (py3k:79441, Mar 26 2010, 13:04:55) \uDC80.encode(utf8) UnicodeEncodeError: 'utf-8' codec can't encode character '\udc80' in position 0: surrogates not allowed Deny encoding surrogates (in utf8) causes a lot of crashs in Python3, because most functions calling suppose that _PyUnicode_AsString() does never fail: see #6687 (and #8195 and a lot of other crashs). It's not a good idea to change it in Python 2.7, because it would require a huge work and we are close to the first beta of 2.7. I wonder how that change got into the 3.x branch - I would certainly not have approved it for the reasons given further up on this ticket. I think we should revert that change for Python 3.2. -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8271 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8271] str.decode('utf8', 'replace') -- conformance with Unicode 5.2.0
STINNER Victor victor.stin...@haypocalc.com added the comment:
I also found out that, according to RFC 3629, surrogates
are considered invalid and they can't be encoded/decoded,
but the UTF-8 codec actually does it.
Python2 does, but Python3 raises an error.
(...)
I wonder how that change got into the 3.x branch - I would certainly
not have approved it for the reasons given further up on this ticket.
I think we should revert that change for Python 3.2.
See r72208 and issue #3672.
pitrou wrote We could fix it for 3.1, and perhaps leave 2.7 unchanged if some
people rely on this (for whatever reason).
--
title: str.decode('utf8', 'replace') -- conformance with Unicode 5.2.0 -
str.decode('utf8', 'replace') -- conformance with Unicode 5.2.0
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[issue8332] regrtest single TestClass/test_method
New submission from anatoly techtonik techto...@gmail.com: It would be convenient for debug to execute single test_method or TestClass. Running all tests in file can take a long time. -- components: Tests messages: 102524 nosy: techtonik severity: normal status: open title: regrtest single TestClass/test_method type: feature request versions: Python 2.7 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8332 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8332] regrtest single TestClass/test_method
anatoly techtonik techto...@gmail.com added the comment: regrtest [options] test_file.TestClass regrtest [options] test_file.test_method -- ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8332 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue4026] fcntl extension fails to build on AIX 6.1
Michael Haubenwallner michael.haubenwall...@salomon.at added the comment: This very same problem happens (with Python-2.6.2) on AIX5.3 now too, after upgrading to: $ oslevel -s 5300-08-09-1013 Unlike before (comparing with old build logs), this AIX5.3 now provides flock() in sys/file.h and libbsd.a[shr.o] like AIX6.1. Interesting enough, /usr/lib/libbsd.a contains 32bit shared objects only, so -lbsd does not help in 64bit mode (don't know if python actually supports 64bit on AIX). I don't have an AIX6.1 to check this. Because of this, upgrading checking for flock from compile- to link-check (eventually trying -lbsd a second time) might help? -- nosy: +haubi ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue4026 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8331] a documentation grammar fix in logging module
Vinay Sajip vinay_sa...@yahoo.co.uk added the comment: Fix checked into trunk (r79888). -- resolution: accepted - fixed status: open - closed ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8331 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue8314] test_ctypes fails in test_ulonglong on sparc buildbots
Mark Dickinson dicki...@gmail.com added the comment: It's surprising that test_ulonglong fails, while test_longlong passes: can the Linux Sparc ABI really be treating these two types differently? Maybe more information could be gained by supplying a more interesting test value than 42---some 8-byte value with all bytes different, for example. In any case, this seems likely to be a libffi bug somewhere; maybe we could bring it up on the libffi mailing list. If we can translate the failing Python code into failing C code first that would probably increase the chances of getting a good answer. Without access to Sparc hardware, I don't see much other way of making progress here. -- nosy: +mark.dickinson ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue8314 ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
