Mailman 3 May 2013 - Python-Dev

Re: [Python-Dev] cpython: Introduce importlib.util.ModuleManager which is a context manager to
by Antoine Pitrou May 30, 2013

May 30, 2013

On Tue, 28 May 2013 23:29:46 +0200 (CEST) brett.cannon <python-checkins(a)python.org> wrote: > > +.. class:: ModuleManager(name) > + > + A :term:`context manager` which provides the module to load. The module will > + either come from :attr:`sys.modules` in the case of reloading or a fresh > + module if loading a new module. Proper cleanup of :attr:`sys.modules` occurs > + if the module was new and an exception was raised. What use case does this API … [View More]

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Bilingual scripts
by Barry Warsaw May 30, 2013

May 30, 2013

Here's something that seems to come up from time to time in Debian. Take a Python application like tox, nose, or pyflakes. Their executables work with both Python 2 and 3, but require a #! line to choose which interpreter to invoke. When we add Python 3 support in Debian for such a script, all the library installations are handled just fine, but we have conflicts about what to name the thing that lands in /usr/bin. Do we have /usr/bin/pyflakes and /usr/bin/pyflakes3? Do we call the latter … [View More]

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Structural cleanups to the main CPython repo
by Nick Coghlan May 29, 2013

May 29, 2013

I have a feature branch where I'm intermittently working on the bootstrapping changes described in PEP 432. As part of those changes, I've cleaned up a few aspects of the repo layout: * moved the main executable source file from Modules to a separate Apps directory * moved the _freezeimportlib and _testembed source files from Modules to a separate Tools directory * split the monster pythonrun.h/c pair into 3 separate header/impl pairs: * bootstrap.h/bootstrap.c * shutdown.h/shutdown.c … [View More]

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Re: [Python-Dev] cpython (merge 3.3 -> default): Merge with 3.3
by Antoine Pitrou May 28, 2013

May 28, 2013

On Tue, 28 May 2013 15:06:39 -0400 Terry Reedy <tjreedy(a)udel.edu> wrote: > On 5/28/2013 2:14 AM, Benjamin Peterson wrote: > > 2013/5/27 terry.reedy <python-checkins(a)python.org>: > >> http://hg.python.org/cpython/rev/c5d4c041ab47 > >> changeset: 83942:c5d4c041ab47 > >> parent: 83940:2ea849fde22b > >> parent: 83941:24c3e7e08168 > >> user: Terry Jan Reedy <tjreedy(a)udel.edu> > >> date: … [View More]

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pep 422 "Safe object finalization" question: why break weakrefs first?
by Russell E. Owen May 28, 2013

May 28, 2013

Pep 422 proposes the following order for dealing with cyclic isolates: 1. Weakrefs to CI objects are cleared, and their callbacks called. At this point, the objects are still safe to use. 2. The finalizers of all CI objects are called. 3. The CI is traversed again to determine if it is still isolated. If it is determined that at least one object in CI is now reachable from outside the CI, this collection is aborted and the whole CI is resurrected. Otherwise, proceed. 4. The CI … [View More]

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PEP 8 and function names
by Sébastien Durand May 28, 2013

May 28, 2013

Hi all, "There should be one-- and preferably only one --obvious way to do it." We all love this mantra. But one thing that often confuses people : function naming. The standard library is kind of inconsistent. Some functions are separated by underscores and others aren't. It's not intuitive and new pythonistas end up constantly reading the doc. (Time saving one char typing vs time guessing function names.) Would it be a good idea to clarify PEP 8 on this ? I mean for future libraries. Regards, Sébastien

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Re: [Python-Dev] [Python-checkins] cpython (merge 3.3 -> default): Merge with 3.3
by Benjamin Peterson May 28, 2013

May 28, 2013

2013/5/27 terry.reedy <python-checkins(a)python.org>: > http://hg.python.org/cpython/rev/c5d4c041ab47 > changeset: 83942:c5d4c041ab47 > parent: 83940:2ea849fde22b > parent: 83941:24c3e7e08168 > user: Terry Jan Reedy <tjreedy(a)udel.edu> > date: Mon May 27 21:33:40 2013 -0400 > summary: > Merge with 3.3 > > files: > Lib/idlelib/CallTips.py | 4 +- > Lib/idlelib/PathBrowser.py | 3 +-… [View More]

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__subclasses__() return order
by Antoine Pitrou May 26, 2013

May 26, 2013

Hello, In http://bugs.python.org/issue17936, I proposed making tp_subclasses (the internal container implementing object.__subclasses__) a dict. This would make the return order of __subclasses__ completely undefined, while it is right now slightly predictable. I have never seen __subclasses__ actually used in production code, so I'm wondering whether someone might be affected by such a change. Regards Antoine.

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Summary of Python tracker Issues
by Python tracker May 24, 2013

May 24, 2013

ACTIVITY SUMMARY (2013-05-17 - 2013-05-24) Python tracker at http://bugs.python.org/ To view or respond to any of the issues listed below, click on the issue. Do NOT respond to this message. Issues counts and deltas: open 3972 ( +6) closed 25850 (+45) total 29822 (+51) Open issues with patches: 1773 Issues opened (41) ================== #13146: Writing a pyc file is not atomic http://bugs.python.org/issue13146 reopened by barry #15535: Fix pickling efficiency of named tuples … [View More]

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Re: [Python-Dev] PEP 443 - Single-dispatch generic functions
by Łukasz Langa May 24, 2013

May 24, 2013

On 24 maj 2013, at 14:53, Ronan Lamy <ronan.lamy(a)gmail.com> wrote: >> 2013/5/24 Łukasz Langa <lukasz(a)langa.pl> >> >> I recognize the need for such behaviour to be discoverable. This is >> important for debugging purposes. This is why I'm going to let users >> inspect registered overloads, as well as provide their own mapping >> for the registry. I'm working on the reference implementation now, >> stay tuned. > > OK, I agree … [View More]

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