python-dev Summary for 2004-11-01 through 2004-11-15

Discussion in 'Python' started by Brett C., Dec 24, 2004.

  1. Brett C.

    Brett C. Guest

    python-dev Summary for 2004-11-01 through 2004-11-15
    This is a summary of traffic on the `python-dev mailing list`_ from November
    01, 2004 through November 15, 2004. It is intended to inform the wider Python
    community of on-going developments on the list. To comment on anything
    mentioned here, just post to `comp.lang.python`_ (or email
    which is a gateway to the newsgroup) with a subject line
    mentioning what you are discussing. All python-dev members are interested in
    seeing ideas discussed by the community, so don't hesitate to take a stance on
    something. And if all of this really interests you then get involved and join

    This is the fifty-second summary written by Brett Cannon (Happy Holidays).

    To contact me, please send email to brett at ; I do not have the
    time to keep up on comp.lang.python and thus do not always catch follow-ups
    posted there.

    All summaries are archived at .

    Please note that this summary is written using reStructuredText_ which can be
    found at . Any unfamiliar punctuation is
    probably markup for reST_ (otherwise it is probably regular expression syntax
    or a typo =); you can safely ignore it, although I suggest learning reST; it's
    simple and is accepted for `PEP markup`_ and gives some perks for the HTML
    output. Also, because of the wonders of programs that like to reformat text, I
    cannot guarantee you will be able to run the text version of this summary
    through Docutils_ as-is unless it is from the `original text file`_.

    ... _PEP Markup:

    The in-development version of the documentation for Python can be found at and should be used when looking up any
    documentation on new code; otherwise use the current documentation as found at . PEPs (Python Enhancement Proposals) are located at . To view files in the Python CVS online, go to . Reported bugs and
    suggested patches can be found at the SourceForge_ project page.

    The `Python Software Foundation`_ is the non-profit organization that holds the
    intellectual property for Python. It also tries to forward the development and
    use of Python. But the PSF_ cannot do this without donations. You can make a
    donation at . Every penny helps so even a
    small donation (you can donate through PayPal or by check) helps.

    ... _python-dev:
    ... _SourceForge:
    ... _python-dev mailing list:
    ... _comp.lang.python:
    ... _Docutils:
    ... _reST:
    ... _reStructuredText:
    ... _PSF:
    ... _Python Software Foundation:

    ... contents::

    ... _last summary:
    ... _original text file:

    Summary Announcements
    I am hoping to be caught up with my summary backlog by the end of the month.
    Here is to hoping.

    2.4 released
    `Python 2.4`_ has been released! Read the `What's New`_ for 2.4 to see what
    the major changes are since 2.3 .

    ... _Python 2.4:
    ... _What's New:

    Contributed threads:
    - `TRUNK FROZEN for 2.4b2 release from 0000UTC 3rd November (tomorrrow)
    - `RELEASED Python 2.4, beta 2

    Code coverage of the regression tests
    Walter Dörwald has a code coverage tool that runs once a month on Python's
    regression test at . There was some issue with
    the 'trace' module having partially broken in 2.4 . The coverage was then run
    using ``Lib/test/ -T`` to get more accurate numbers.

    Contributing threads:
    - `Code coverage tool updated

    Garbage collecting weakref callbacks
    Tim Peters discovered that in 2.4 if a weakref's callback is still reachable
    but the referent and weakref itself are unreachable (Tim's example had an
    instance that contained a weakref to itself) that the callback is not called
    during garbage collection. This seemed inconsistent since if the weakref in
    Tim's example was replaced with an instance that contained a __del__ method
    that the method would have been called.

    Tim would like to clean this up so as to be able to ditch __del__ methods in
    Python 3000. The idea is that one would register a weakref with a callback for
    an object in itself that would be called when it is garbage collected. This
    would also negate the need for gc.garbage .

    Contributing threads:
    - `weakref gc semantics
    - `patch-finalizer vs Zope3

    PEP Watch
    `PEP 336`_ introduces the idea of having None be a callable object. The result
    of calling None would return None itself.

    ... _PEP 336:

    Contributing threads:
    - `PEP 336, "Make None Callable", by Andrew McClelland

    Discussion of including pysqlite in the stdlib
    The idea of including pysqlite_ in the stdlib came up once again (note this is
    the wrapper for SQLite_ and not SQLite itself). The arguments for including
    the module were that SQLite is most likely used more than Sleepycat and thus
    deserved a place in the stdlib if bsddb did. It also goes along with Python's
    idea of "batteries included".

    Arguments against the proposal started with the idea that sanctioning pysqlite
    over other SQLite wrappers was improper. People also thought that including
    bsddb might not be correct anymore and thus should not be used as a basis for
    including pysqlite.

    This all then led into a discussion about package management and how to
    simplify extending what can be installed at compile-time. The idea of pushing
    PyPI_ came up as well as revising `PEP 206`_.

    ... _pysqlite:
    ... _SQLite:
    ... _PyPI:
    ... _PEP 206:

    Contributing threads:
    - `SQLite module for Python 2.5

    2.3 maintenance coming to an end
    With Python 2.4 out, maintaining 2.3 is no longer a priority. Anthony Baxter,
    our beloved release manager, has said that 2.3.5 will be most likely coming out
    in January. After that, though, don't count on another 2.3 release since 2.4
    will take its place as the version to maintain.

    All of this came about by the fact that Facundo Batista asked if closing 2.1
    bugs was okay. As long as they have been fixed in the earliest version being
    maintained, closing them is fine. This goes for 2.2 as well. And as soon as
    2.3.5 is released this will most likely apply to 2.3 bugs.

    Contributing threads:
    - `Policy about old Python versions

    Sync/async servers in the stdlib and whether they should be there
    There are multiple servers in the core for handling communications in both a
    synchronous and asynchronous manner. The idea came up of developing an API
    that all servers could follow in the core. While the discussion went back and
    forth with multiple mentions of PEAK, Twisted, and greenlets_, in the end the
    trend of the discussion suggested doing this well would be very difficult and
    not worth the effort. asyncore and asynchat also seemed to be deemed worth
    deprecation and thus not worth using.

    ... _PEAK:
    ... _Twisted:
    ... _greenlets:

    Contributing threads:
    - `Synchronous and Asynchronous servers in the standard library

    Getting the opcode count for rough profile numbers
    The idea was proposed of introducing sys.gettickeraccumulation which would
    contain the number of opcodes executed since the interpreter started. The idea
    is that you can get a rough estimate of how much time is being spent in Python
    code. The value of this has wavered back and forth with no clear answer.

    If it does get included it will not be on by default.

    Contributing threads:
    - `proposal+patch: sys.gettickeraccumulation()

    Skipped Threads
    - Deprecate PyRange_New()
    - interlocking dependencies on the path to a release
    see the first email to see what steps are needed for a release
    - Overflow in socketmodule.c?
    - Int literals and method calls
    To get access to methods on an int literal put a space after the number;
    ``1 .__class__``
    - os.access versus os.exist
    - syntactic shortcut - unpack to variably sized list
    don't expect syntactic support variable-length sequences ain't happenin'
    Brett C., Dec 24, 2004
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