Mailman 3 April 2010 - Python-Dev

patch for review: unittest ImportError handling
by Chris Jerdonek April 14, 2010

April 14, 2010

Hi folks, I have a patch to the unittest module for review here: http://bugs.python.org/issue7559#msg102801 (There have already been a couple rounds of discussion on how to best fix this.) This is my first patch, so any feedback is appreciated. Thanks, --Chris

4 7

Re: [Python-Dev] [Python-checkins] r80025 - peps/trunk/pep-3147.txt
by Nick Coghlan April 14, 2010

April 14, 2010

barry.warsaw wrote: > +It is recommended that when nothing sensible can be calculated, > +implementations should set the `__cached__` attribute to `None`. What (if anything) should we set __cached__ to in __main__? Cheers, Nick. -- Nick Coghlan | ncoghlan(a)gmail.com | Brisbane, Australia ---------------------------------------------------------------

2 5

Re: [Python-Dev] Decimal <-> float comparisons in py3k.
by P.J. Eby April 14, 2010

April 14, 2010

At 09:58 AM 3/16/2010 -0500, Facundo Batista wrote: >I'm +0 to allow these comparisons, being "Decimal(1) < .3" the same as >"Decimal(1) < Decimal.from_float(.3)" Does Decimal.from_float() use the "shortest decimal representation" approach? If not, it might be confusing if a number that prints as '.1' compares unequal to Decimal('.1').

9 18

Use surrogates for Python import
by Victor Stinner April 14, 2010

April 14, 2010

Hi, Python3 refuses to start with LANG=C if it's installed in a non-ASCII directory. I wrote a patch fixing this issue, but it changes a lot of code and I would like your opinion. The main part changes import to use surrogateescape everywhere (find_module, load_source_module, null importer, zip importer, etc.). Other files have to be adapted: - traceback.c (tb_printinternal), - ast.c (ast_error_finish), - compile.c (compiler_error), - bltinmodule.c (builtin_compile), - _warnings.c (… [View More]

1 0

GSoC mentors needed
by "Martin v. Löwis" April 13, 2010

April 13, 2010

It seems the Python (core) project needs some more mentors, to really match the proposals that we got. I don't want to post a list of proposals here, so if you are willing to potentially mentor a project, please join the soc2010-mentors list ASAP and/or contact Arc Riley. Doing so would neither be a commitment nor a guarantee that you will actually mentor a project - this depends on a lot of factors (your interest in a specific project, Google's ultimate assigment of slots, and so on). Regards, Martin

1 0

Tuning Python dicts
by Reid Kleckner April 13, 2010

April 13, 2010

Hey folks, I was looking at tuning Python dicts for a data structures class final project. I've looked through Object/dictnotes.txt, and obviously there's already a large body of work on this topic. My idea was to alter dict collision resolution as described in the hopscotch hashing paper[1]. I think the PDF I have came from behind a pay-wall, so I can't find a link to the original paper. [1] http://en.wikipedia.org/wiki/Hopscotch_hashing Just to be clear, this is an experiment I'm doing … [View More]

5 8

Traceback object has no __class__?
by Greg Ewing April 13, 2010

April 13, 2010

I thought type-class unification was supposed to mean that all objects now have a __class__ attribute. But traceback objects don't seem to: import sys try: raise ValueError except ValueError: tb = sys.exc_info()[2] print tb print tb.__class__ results in: % python2.6 traceback_class.py <traceback object at 0x82dc8> Traceback (most recent call last): File "traceback_class.py", line 8, in <module> print tb.__class__ AttributeError: __class__ -- Greg

3 3

"Fixing" the new GIL
by Antoine Pitrou April 12, 2010

April 12, 2010

Hello, As some of you may know, Dave Beazley recently exhibited a situation where the new GIL shows quite a poor behaviour (the old GIL isn't very good either, but still a little better). This issue is followed in http://bugs.python.org/issue7946 This situation is when an IO-bound thread wants to process a lot of incoming packets, while one (or several) CPU-bound thread is also running. Each time the IO-bound thread releases the GIL, the CPU-bound thread gets it and keeps holding it for at … [View More]

12 39

Issue #7978, unexpected EINTR-related exceptions
by Yaniv Aknin April 12, 2010

April 12, 2010

Issue #7978 (http://bugs.python.org/issue7978) describes a bug in SocketServer where a received signal in SocketServer's select() call will raise an uncaught exception due to EINTR. The proposed solution was to wrap SocketServer's select() with something like twisted's untilConcludes function, which catches EINTR exceptions and re-calls the call (see issue for code). However, before committing this to SocketServer, neologix raised the (valid) concern that this is generally-useful code, already … [View More]

3 2

[RELEASED] 2.7 beta 1
by Benjamin Peterson April 12, 2010

April 12, 2010

On behalf of the Python development team, I'm merry to announce the first beta release of Python 2.7. Python 2.7 is scheduled (by Guido and Python-dev) to be the last major version in the 2.x series. Though more major releases have not been absolutely ruled out, it's likely that the 2.7 release will an extended period of maintenance for the 2.x series. 2.7 includes many features that were first released in Python 3.1. The faster io module, the new nested with statement syntax, improved … [View More]

7 6