Mailman 3 March 2013 - Python-Dev

noob contributions to unit tests
by Sean Felipe Wolfe May 2, 2013

May 2, 2013

Hey everybody how are you all :) I am an intermediate-level python coder looking to get help out. I've been reading over the dev guide about helping increase test coverage --> http://docs.python.org/devguide/coverage.html And also the third-party code coverage referenced in the devguide page: http://coverage.livinglogic.de/ I'm seeing that according to the coverage tool, two of my favorite libraries, urllib/urllib2, have no unit tests? Is that correct or am I reading it wrong? If that's … [View More]

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Introducing Electronic Contributor Agreements
by Brian Curtin April 15, 2013

April 15, 2013

The full announcement is at http://blog.python.org/2013/03/introducing-electronic-contributor.html, but a summary follows. We've now moved to an electronic Contributor License Agreement form at http://www.python.org/psf/contrib/contrib-form/ which will hopefully ease the signing and sending of forms for our potential contributors. The form shows the required fields whether you're signing as an individual or a representative of an organization, and removes the need to print, scan, fax, etc. … [View More]

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How to fix the incorrect shared library extension on linux for 3.2 and newer?
by Matthias Klose April 10, 2013

April 10, 2013

This is http://bugs.python.org/issue16754, affecting Linux systems only, and only those which don't provide static libraries. PEP 3149 did change the SO macro to include the ABI tag, although the SO macro is used to search for shared system libraries too. E.g. searching for the jpeg library search for a file libjpeg.cpython3.3m.so, which is not found. If the static library libjpeg.a is found, it is taken, and linked as -ljpeg, which then links with the shared library. The patch in the issue … [View More]

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Semantics of __int__(), __index__()
by Mark Shannon April 6, 2013

April 6, 2013

Hi all, I was looking into http://bugs.python.org/issue17576 and I found that the semantics of __int__() and __index__() are not precisely defined in the documentation and that the implementation (CPython 3.4a) has some odd behaviour. Defining two classes: class Int1(int): def __init__(self, val=0): print("new %s" % self.__class__) class Int2(Int1): def __int__(self): return self and two instances i1 = Int1() i2 = Int2() we get the following behaviour: … [View More]

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Slides from today's parallel/async Python talk
by Trent Nelson April 5, 2013

April 5, 2013

Just posted the slides for those that didn't have the benefit of attending the language summit today: https://speakerdeck.com/trent/parallelizing-the-python-interpreter-an-alter… Trent.

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Are undocumented exceptions considered bugs?
by Stefan Bucur April 3, 2013

April 3, 2013

Hi, I'm not sure this is the right place to ask this question, but I thought I'd give it a shot since it also concerns the Python standard library. I'm writing an automated test case generation tool for Python programs that explores all possible execution paths through a program. When applying this tool on Python's 2.7.3 urllib package, it discovered input strings for which the urllib.urlopen(url) call would raise a TypeError. For instance: urllib.urlopen('\x00\x00\x00') [...] File "/home/… [View More]

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A bit about the GIL
by Alfredo Solano Martínez April 1, 2013

April 1, 2013

Hi, I know this may be tiresome by now, so feel free to ignore, but I'd like to share with the list an idea about the GIL, more specifically the reference counting mechanism. Simply put, make the reference counter a sharded one. That is, separate it into several subcounters, in this case one for each thread. The logic would then be something like this: - when increasing the refcount, a thread writes only to its own subcounter, creating one first if necessary. - similarly, when decreasing the … [View More]

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mingw32 port
by Matthias Klose March 31, 2013

March 31, 2013

[No, I'm not interested in the port myself] patches for a mingw32 port are floating around on the web and the python bug tracker, although most of them as a set of patches in one issue addressing several things, and which maybe outdated for the trunk. at least for me re-reading a big patch in a new version is more work than having the patches in different issues. So proposing to break down the patches in independent ones, dealing with: - mingw32 support (excluding any cross-build support). … [View More]

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Re: [Python-Dev] [Python-checkins] cpython (2.7): Add an itertools recipe showing how to use t.__copy__().
by Brett Cannon March 31, 2013

March 31, 2013

"Upcomping" -> "upcoming" On Mar 31, 2013 2:38 AM, "raymond.hettinger" <python-checkins(a)python.org> wrote: > http://hg.python.org/cpython/rev/1026b1d47f30 > changeset: 83037:1026b1d47f30 > branch: 2.7 > parent: 83034:e044d22d2f61 > user: Raymond Hettinger <python(a)rcn.com> > date: Sat Mar 30 23:37:57 2013 -0700 > summary: > Add an itertools recipe showing how to use t.__copy__(). > > files: > Doc/library/itertools.… [View More]

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Re: [Python-Dev] py2.7: dictobject not properly resizing
by Micha Gorelick March 31, 2013

March 31, 2013

True, but your example mechanism of getting a shrink event is purely based on ma_fill. This is happening because your last loop is increasing ma_fill to the point where it thinks it needs to resize because of the load factor and then it calculates the new size based on ma_used. The comment that I pointed out from the code seems to imply that simply having ma_fill >> ma_used will trigger a resize. The two conditions for a resize are definitely not equivalent! Micha ----------------------… [View More]

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