python-dev Summary for 2005-12-16 through 2005-12-31

Discussion in 'Python' started by Tony Meyer, Jan 20, 2006.

  1. Tony Meyer

    Tony Meyer Guest

    [The HTML version of this Summary is available at
    http://www.python.org/dev/summary/2005-12-16_2005-12-31.html]



    =============
    Announcements
    =============

    ----------------------------
    QOTF: Quote of the Fortnight
    ----------------------------

    Python-dev is in love with Python, though sometimes too much, Fredrik
    Lundh contends:

    ...in reality, some things are carefully thought out and craftily
    implemented, some things are engineering tradeoffs made at a certain
    time, and some things are just accidents -- but python-dev will
    happily defend the current solution with the same energy, no matter
    what it is.

    Contributing thread:

    - `a quit that actually quits
    <http://mail.python.org/pipermail/python-dev/2005-December/059283.html>`__

    [SJB]

    -------------------------------------------------------
    Reminder: plain text documentation patches are accepted
    -------------------------------------------------------

    Want to help out with the Python documentation? Don't know LaTeX? No
    problem! Plain text or ReST fixes are also welcome. You won't be able
    to produce a diff file like with a normal patch, but comments that
    explain how to fix the docs are just as good. A form like "in section
    XXX right before the paragraph starting with YYY, the documentation
    should say ZZZ" will make it easy for the doc maintainers to apply
    your fix.

    Contributing thread:

    - `LaTeX and Python doc contributions
    <http://mail.python.org/pipermail/python-dev/2005-December/059001.html>`__

    [SJB]

    ---------------------------------------------------------------
    PyPy Sprint: Palma de Mallorca (Spain) 23rd - 29th January 2006
    ---------------------------------------------------------------

    The next PyPy_ sprint is scheduled to take place from the 23rd to the
    29th of January 2006 in Palma De Mallorca, Balearic Isles, Spain.
    There will be newcomer-friendly introductions and the focus will
    mainly be on current JIT work, garbage collection, alternative
    threading models, logic programming and on improving the interface
    with external functions.

    .. _PyPy: http://codespeak.net/pypy

    Contributing thread:

    - `Next PyPy Sprint: Palma de Mallorca (Spain) 23rd - 29th January
    2006 <http://mail.python.org/pipermail/python-dev/2005-December/058975.html>`__

    [TAM]

    --------------------------------------------------
    SHA-224, -256, -384 and -512 support in Python 2.5
    --------------------------------------------------

    Ronald L. Rivest asked about the cryptographic hash function support
    in Python, now that md5 and sha1 are broken in terms of
    collision-resistance. The new-in-Python-2.5 hashlib module was
    pointed out (and somewhat belatedly added to the NEWS file), which
    includes new implementations for SHA-224, -256, -384 and -512 (these,
    including tests, are already in SVN).

    Gregory P. Smith noted that although the code isn't currently
    available for earlier versions of Python, he does plan to release a
    standalone package for Python 2.3 and Python 2.4, when time permits.

    Contributing thread:

    - `hashlib - faster md5/sha, adds sha256/512 support
    <http://mail.python.org/pipermail/python-dev/2005-December/058850.html>`__

    [TAM]

    =========
    Summaries
    =========

    -----------------------------------
    Improving the documentation process
    -----------------------------------

    Fredrik Lundh asked about automatically updating the development docs,
    so that users wouldn't be required to have a latex toolchain installed
    to get an HTML version of the current docs. This spawned a long
    discussion about using something other than LaTeX (e.g. microformats_
    or ReST_) for markup. Though HTML has the advantage that many Python
    users are already familiar with it, a number of people voiced concerns
    about the ease of reading and writing it. ReST is generally easy to
    read and write, but some people suggested that for complicated
    structured text (like Python function and class definitions) it was no
    better than LaTeX. Fredrik Lundh presented some example code
    side-by-side_ and argued that using HTML with something like
    PythonDoc_ could better represent the documentation's intent. He also
    produced an initial conversion_ of the Python docs to this format.

    Fredrik also pointed out that currently the doc patch submission
    procedure is rather tedious, and listed_ the rather large number of
    steps required for end-users and developers to get their documentation
    fixes added to the current Python docs. He claimed that a simple wiki,
    discussion board, or "user edit" mechanism like that of roundup_,
    combined with automated updates of the documentation from the Python
    SVN trunk, could reduce this procedure to two or three simple steps.
    As a partial effort towards this goal, Trent Mick started posting
    `daily builds`_ of the Python HTML. This prompted Neal Norwitz to set
    up the docs server in a similar manner so that it now produces
    development documentation builds twice daily at
    http://docs.python.org/dev/.

    ... _microformats: http://microformats.org/wiki/microformats
    ... _side-by-side:
    http://mail.python.org/pipermail/python-dev/2005-December/059022.html
    ... _PythonDoc: http://effbot.org/zone/pythondoc.htm
    ... _conversion: http://effbot.org/zone/pythondoc-lib.htm
    ... _listed: http://mail.python.org/pipermail/python-dev/2005-December/059311.html
    ... _roundup: http://roundup.sourceforge.net
    ... _daily builds: http://trentm.com/python/

    Contributing threads:

    - `status of development documentation
    <http://mail.python.org/pipermail/python-dev/2005-December/058910.html>`__
    - `documentation comments
    <http://mail.python.org/pipermail/python-dev/2005-December/058991.html>`__
    - `[Doc-SIG] status of development documentation
    <http://mail.python.org/pipermail/python-dev/2005-December/058999.html>`__
    - `reST limitations? (was Re: status of development documentation)
    <http://mail.python.org/pipermail/python-dev/2005-December/059016.html>`__
    - `that library reference, again
    <http://mail.python.org/pipermail/python-dev/2005-December/059087.html>`__
    - `[Doc-SIG] that library reference, again
    <http://mail.python.org/pipermail/python-dev/2005-December/059294.html>`__

    [SJB]

    --------------------------------------
    Making quit and exit more command-like
    --------------------------------------

    Fredrik Lundh kicked off a surprisingly long thread when he proposed
    that typing "quit" or "exit" in the interactive prompt actually exit
    (i.e. raises SystemExit) rather than printing a message informing the
    user how they can exit, to avoid the "if you knew what I wanted, why
    didn't you just do it?" situation. His proposal was to install a
    custom excepthook that looks for the appropriate NameErrors at the top
    level (in interactive mode only).

    Early discussion revolved around the implementation. Skip Montanaro
    worried that multiple code sources wanting to change sys.excepthook
    would step on one another's toes; Fredrik felt that if you add your
    own excepthook, you take responsibility. Martin was also concerned
    about this; although Fredrik believed that the change was so early
    that no code would try to add a hook prior to this, Martin suggested
    that the code stand as an example of good practice and pass execution
    on to any existing excepthook (if the command wasn't "exit" or
    "quit").

    Reinhold Birkenfeld suggested that exit and quit could be instances of
    a class whose repr() raises SystemExit; however, this would cause an
    exit to be incorrectly performed whenever the exit or quit objects
    were examined (e.g. calling vars()). Reinhold suggested a variation
    where the SystemExit would only be raised if
    sys._getframe(1).f_code.co_names was "exit" or "quit"). Having quit
    and exit be functions (i.e. one would type "exit()" to exit) was also
    suggested, with a plain "exit" printing a help message (as today).
    However, while this shortens the platform-independent method of
    exiting ("raise SystemExit") to "exit()", it does nothing to address
    the "why didn't you just do it?" problem.

    Ka-Ping Yee was concerned that Fredrik's implementation would cause an
    exit in surprising situations, such as ::

    print exit # seems surprising
    [3, 4, 5, exit] # seems surprising
    'a' in 'xyz' or exit # desirable or undesirable?
    del exit # actually happened to me
    x = exit # seems surprising

    And that Reinhold's modified proposal would do likewise::

    print exit # seems surprising
    [3, 4, 5, exit] # seems surprising
    'a' in 'xyz' or exit # desirable or undesirable?
    def foo():
    print exit
    foo() # seems surprising

    As such, Fredrik proposed adding a new sys attribute that contains the
    most recent interpreter line, which could be examined to check that
    the line entered was simply "exit" or "quit" by itself. Skip
    suggested that such an attribute be made clearly private magic (e.g.
    by naming it sys._last_input).

    Michael Hudson suggested that the clever hacks could be avoided by
    simply having the equivalent of "if input.rstrip() == "exit": raise
    SystemExit" in the implementation of the interactive interpreter.
    Fredrik felt that this would elevate "exit" and "quit" into reserved
    keywords, in that this could occur::

    >>> def exit():

    ... print "bye"

    >>> # what is it?
    >>> exit


    $ oops!

    (However, one could simply type "repr(exit)" rather than "exit" in this case).

    Walter Dörwald suggested adding "sys.inputhook" (c.f. sys.displayhook,
    sys.excepthook), which gets each statement entered and returns True if
    it processed the line or False if normal handling should be done; Alex
    Martelli made a similar suggestion. This would not only allow special
    handling for "exit", "quit", and "help", but also might make
    implementing alternative shells easier. Nick Coghlan added a default
    handler to this suggestion, which checked a new dictionary,
    "sys.aliases", for special statements of this type and called an
    appropriate function if found. Fredrik's concern with this method was
    the same as with Michael Hudson's - that typing "exit" as a shortcut
    for "print repr(exit)" (when the user had assigned a value to "exit")
    would cause the shell to exit. As a result, Nick modified his default
    inputhook to check that the statement didn't exist in __main__'s
    vars(). Fernando Perez pointed out that this begins to come close to
    reimplementing ipython_.

    Fernando also commented that he felt that the amount of code he
    thought would be necessary to avoid any side-effects when determining
    whether "exit" should exit or not would make the standard interpreter
    too brittle, and that this should be left to third-party interpreters.
    He gave a lengthy explanation of the process that ipython went
    through, including linking to `the _prefilter method` that performs
    the appropriate magic in ipython. His opinion was that interpreters
    should have a separate command mode, entered by a particular character
    (e.g. the '%' used in ipython); while this would simply code, '%exit'
    would be even harder for people to guess, however.

    Some people were concerned that "quit" and "exit" would be treated
    specially (i.e. the standard way to do something is to "call a
    function" and a special case for exiting the interpreter is
    inappropriate); others pointed out that this would be there especially
    for people who don't know how to program in Python, and might not know
    that typing an EOF would exit the shell (or what the EOF character was
    for their platform).

    Fredrik's proposal gained a lot of early support, but later posters
    were not so keen. Stephen J. Turnbull suggested that the problem was
    simply that the current "help"/"exit" messages are impolite, and
    changing the language would solve the problem. Similarly, Aahz
    suggested that adding an explanation of how to quit to the startup
    message would suffice, although others disagreed that users would
    notice this, particularly when it was needed.

    Despite the strong support, however, in the end, Guido stepped in and
    stated that, in his opinion, nothing was wrong wih the status quo (or
    that if anything were to be changed, the hints provided by typing
    "exit" or "quit" should be removed). This pretty much ended the
    discussion.

    ... _ipython: http://ipython.scipy.org
    ... _`the _prefilter method`:
    http://projects.scipy.org/ipython/ipython/file/ipython/trunk/IPython/iplib.py

    Contributing threads:

    - `a quit that actually quits
    <http://mail.python.org/pipermail/python-dev/2005-December/059094.html>`__

    ---------------------------------------
    Exposing the Subversion revision number
    ---------------------------------------

    Barry Warsaw proposed `a fairly simple patch`_ to expose the
    Subversion revision number to Python, both in the Py_GetBuildInfo()
    text, in a new Py_GetBuildNumber() C API function, and via a new
    sys.build_number attribute.

    A lengthy discussion took place about the correct method of
    determining the "revision number" that should be used. There are many
    possibilities, from the originally proposed revision number in which
    the directory was last modified, to the latest revision number within
    the tree, to using subversion itself. Each method requires a
    different amount of processing in order to determine the correct
    value. Barry indicated a preference for the original, simple, method,
    because he wished to keep the patch as simple as possible, didn't want
    to depend on Python already being built, and felt that generally
    developers will just 'svn up' at the top of the source tree then
    rebuild, rather than 'svn up' a buried sub-tree, change back to the
    top directory, and rebuild from there.

    Phillip J. Eby's concern with this was that this would not indicate if
    a change has been made locally and committed, unless the developer
    also did a 'svn up'. He also pointed out that the "Revision" from
    'svn info' can change when the code doesn't change (because it will
    change when code in branches, the sandbox, PEPs, and so forth change).

    In the end, using the svnversion command was agreed on as a suitable
    method. The two main advantages are that this is the officially
    sanctioned (by Subversion) method, and that it indicates when local
    changes have been made.

    Armin Rigo voiced a concern that people would use sys.build_number to
    check for features in their programs, instead of using
    sys.version_info (or duck-typing methods such as hasattr()) because it
    seems that comparing a single number is easier than comparing a tuple.
    This was of especial concern considering that this value would only
    be present in CPython. He suggested that a new build_info attribute
    could be added to sys instead, which would be a tuple of ("CPython",
    "<SVN revision number>", "trunk"); that is, it would also include
    which Python implementation the program is using (for particular use
    by the test suite). The name also has advantages in that the number
    is actually a string (because 'M' will be present if there are local
    modifications) and it is not tied to a specific version control
    system.

    Michael Hudson pointed out that this value will not be able to be
    obtained when Python is built from an 'svn export' (where the .svn
    files do not exist), which is probably the case for many Python
    distributions. He wondered whether a subversion trigger could put the
    revision number into some file in the repository to cover this case,
    but Martin indicated that this would be difficult (although if the
    distribution is built from a tag, that the information would not be
    necessary). Barry suggested that the number would be the latest
    revision at which getbuildinfo was changed if a .svn directory isn't
    found.

    As an aside to this patch, Martin suggested that the build number
    should be dropped, as it stopped working on Windows some time ago and
    no longer provides any useful information. There was no opposition to
    this proposal, and some support.

    .. _a fairly simple patch: http://python.org/sf/1382163

    Contributing threads:

    - `Expose Subversion revision number to Python
    <http://mail.python.org/pipermail/python-dev/2005-December/058832.html>`__

    [TAM]

    ---------------------------------------
    Python's lists, linked lists and deques
    ---------------------------------------

    Martin Blais asked why Python didn't have native singly-linked or
    doubly-linked list types. Generally, it seemed that people couldn't
    find use cases for them that weren't covered by Python's builtin
    lists, collections.deque objects, or head-plus-tail-style two-tuples.
    The proposal was redirected to comp.lang.python until it was more
    developed.

    In a related thread, Christian Tismer asked if Python's list type
    could do a little usage-tracking and switch between the current
    array-based implementation and a deque-based implementation if, say, a
    large number of inserts or deletes began to occur at the beginning of
    the list. He got a few responses suggesting that it would be more
    complication that it was worth, but mostly his question got drowned
    out by the linked-list discussion.

    Contributing threads:

    - `Linked lists
    <http://mail.python.org/pipermail/python-dev/2005-December/058754.html>`__
    - `deque alternative (was: Linked lists)
    <http://mail.python.org/pipermail/python-dev/2005-December/059054.html>`__
    - `deque alternative
    <http://mail.python.org/pipermail/python-dev/2005-December/059076.html>`__
    - `(back to): Linked lists -- (was: deque alternative)
    <http://mail.python.org/pipermail/python-dev/2005-December/059119.html>`__

    [SJB]

    ------------------------
    set() memory consumption
    ------------------------

    Noam Raphael noted, as others have before, that sets (and dicts) do
    not release allocated memory after calls to pop(). He suggested that
    to keep pop() as amortized O(1) per delete, all that was needed was to
    resize the table to half its current size whenever it dropped to less
    that one quarter full. People seemed generally to think that the dict
    implementation (and therefore the set implementation which is based on
    it) were already highly optimized for real-world performance, and that
    there were too few use cases where a set would be filled and then
    emptied, but not filled up again.

    Raymond Hettinger is hesitant about getting too explicit in the
    documentation, because some of the choices are an implementation
    accident that might be different in, say, Jython. There are some
    `proposed changes`_ to the dictnotes.txt file in the source
    distribution; there may well be room for additional improvements.

    .. _proposed changes: http://python.org/sf/1397848

    Contributing thread:

    - `When do sets shrink?
    <http://mail.python.org/pipermail/python-dev/2005-December/059228.html>`__

    [SJB, with additions from Jim Jewett]

    ---------------------------------------------------------
    Changing the naming conventions of builtins in Python 3.0
    ---------------------------------------------------------

    Ka-Ping Yee provocatively suggested that, to be consistent with the
    recommended style guide, in Python 3.0 built-in constants (None, True,
    False) should be in all caps (NONE, TRUE, FALSE), and built-in classes
    (object, int, float, str, unicode, set, list, tuple, dict) should be
    in CapWords (Object, Int, Float, Str, Unicode, Set, List, Tuple,
    Dict). However, Michael Chermside noted that there is a common
    convention that the fundamental built-in types (not standard library
    types; e.g. set, not sets.Set) are all in lowercase.

    Almost no-one liked this idea, and many people were vehemently
    opposed. Guido quickly pronounced this dead for built-in types
    (cleaning up and making the more consistent the standard library
    classes is another matter).

    Contributing thread:

    - `Naming conventions in Py3K
    <http://mail.python.org/pipermail/python-dev/2005-December/059304.html>`__

    [TAM]

    -------------------
    Default comparisons
    -------------------

    Today, you can compare anything, unless someone has gone out of their
    way to prevent it. Unfortunately, this comparison can eventually
    fallback to comparing id(), which is not stable across database
    save-and-restore. Not falling back to id(), which is suggested in
    `PEP 3000`_, would mean that comparison results are more permanent
    (and less arbitrary), but it would come at the cost of extra raised
    exceptions that make it harder to get a canonical ordering.

    An alternative solution would be to promote a standard way to say
    "just get me a canonical ordering of some sort". "Comparison" would
    raise a TypeError if the pair of objects were not comparable;
    "Ordering" would continue on to "something consistent", just like
    sorts do today.

    Josiah Carlson suggested that this could be achieved by new
    superclasses for all built-in types (except string and unicode, which
    already subclass from basestring). int, float, and complex would
    subclass from basenumber; tuple and list would subclass from
    basesequence; dict and set would subclass from basemapping. Each of
    these base classes define a group in which items are comparable; if
    you end up in a situation in which the base classes of the compared
    object differ, you compare their base class name. If a user-defined
    classes wanted to be compared against (e.g.) ints, floats, or complex,
    the user would subclass from basenumber; if the user only wanted their
    objects to compare against objects of its own type, they define their
    own __cmp__. However, Marc-Andre Lemburg pointed out that Python
    already uses this 'trick' based on the type name (falling back to
    id(), which is the problem), and that inheriting from (e.g.)
    basenumber could result in unexpected side-effects.

    ... _PEP 3000: http://www.python.org/peps/pep-3000.html

    Contributing thread:

    - `Keep default comparisons - or add a second set?
    <http://mail.python.org/pipermail/python-dev/2005-December/058899.html>`__

    [TAM]

    ---------------------------------------
    Converting open() to a factory function
    ---------------------------------------

    Guido had previously_ indicated that while file() will always stay the
    name of the file object, open() may be changed in the future to a
    factory function (instead of just being an alias for file). Noting
    that ``help(open)`` now just displays the file object documentation,
    Aahz suggested that open() become a factory function now. Fredrik
    Lundh chimed in to suggest that a textopen() function should also be
    introduced, which would call codecs.open() or file() depending on
    whether or not an encoding was supplied. There was mild support for
    both proposals, but no patches were available at the time of this
    writing.

    ... _previously:
    http://mail.python.org/pipermail/python-dev/2004-July/045921.html

    Contributing thread:

    - `file() vs open(), round 7
    <http://mail.python.org/pipermail/python-dev/2005-December/059073.html>`__

    [SJB]

    -----------------------------
    NotImplemented and __iadd__()
    -----------------------------

    Facundo Batista presented a bug_ where using += on Decimal objects
    returned NotImplemented instead of raising an exception. Armin Rigo
    was able to supply a patch after adding the following conditions to
    the documentation:

    * PySequence_Concat(a, b) and operator.concat(a, b) mean "a + b", with
    the difference that we check that both arguments appear to be
    sequences (as checked with operator.isSequenceType()).
    * PySequence_Repeat(a, b) and operator.repeat(a, b) mean "a * b",
    where "a" is checked to be a sequence and "b" is an integer. Some
    bounds can be enforced on "b" -- for CPython, it means that it must
    fit in a C int.

    ... _bug: http://www.python.org/sf/1355842

    Contributing thread:

    - `NotImplemented reaching top-level
    <http://mail.python.org/pipermail/python-dev/2005-December/059046.html>`__

    [SJB]

    ---------------------------------------------------
    Using buildbot to automate testing of Python builds
    ---------------------------------------------------

    Contributing thread:

    - `Automated Python testing (was Re: status of development
    documentation) <http://mail.python.org/pipermail/python-dev/2005-December/059060.html>`__

    -----------------------------------------------------
    Importing C++ extensions compiled with Visual C++ 8.0
    -----------------------------------------------------

    Ralf W. Grosse-Kunstleve indicated that while they could compile their
    C++ extensions with Visual C++ 8.0, importing any such extensions
    resulted in an error::

    This application has failed to start because MSVCP80.dll was not found.
    Re-installing the application may fix this problem.

    Though the combination of compiling Python with VS.NET2003 and an
    extension with VS2005 is not supported, Ralf was able to get things to
    work by adding ``/manifest`` to the linker options and invoking
    ``mt.exe`` to embed the manifest.

    Contributing thread:

    - `Python + Visual C++ 8.0?
    <http://mail.python.org/pipermail/python-dev/2005-December/059085.html>`__

    [SJB]

    -------------------------------
    Using ssize_t as the index type
    -------------------------------

    Martin v. Löwis presented `PEP 353`_, which proposes using ssize_t as
    the index type in the CPython implementation. In Python 2.4, indices
    of sequences are restricted to the C type int. On 64-bit machines,
    sequences therefore cannot use the full address space, and are
    restricted to 2**31 elements. The PEP proposes to change this,
    introducing a platform-specific index type Py_ssize_t. An
    implementation of the proposed change is in `an SVN branch`_; the
    Py_ssize_t will have the same size as the compiler's size_t type, but
    is signed (it will be a typedef for ssize_t where available).

    Although at the moment one needs 16GiB to just hold the pointers of a
    2GiElement list, these changes also allow strings and mmap objects
    longer than 2GiB (and also improve the scipy_core (neé Numarray and
    Numerical) objects, which are already 64-bit clean). Since the
    proposed change will cause incompatibilities on 64-bit machines, the
    reasoning is that this change should be done as early as possible
    (i.e. while such machines are not in wide use).

    Guido approved the PEP, indicating he believed it was long overdue.
    Several other people also indicated support for the PEP.

    Note that people felt that Martin's PEP was of a particularly high
    standard; people considering writing their own PEP should consider
    reading this (once it has a number and is available online!) to gain
    an understanding of how a good PEP is both extremely readable (even
    when including arcane C programming points!) and well-organised.

    .. _an SVN branch: http://svn.python.org/projects/python/branches/ssize_t
    .. _PEP 353: http://www.python.org/peps/pep-0353.html

    Contributing threads:

    - `New PEP: Using ssize_t as the index type
    <http://mail.python.org/pipermail/python-dev/2005-December/059266.html>`__
    - `Test branch for ssize_t changes
    <http://mail.python.org/pipermail/python-dev/2005-December/058863.html>`__

    [TAM]

    -----------------------------------------------------------------------------
    Garbage collection based on object memory consumption instead of object count
    -----------------------------------------------------------------------------

    Andrea Arcangeli suggested that Python's garbage collection could be
    improved by invoking a gc.collect() at least once every time the
    amount of anonymous memory allocated by the interpreter increases by a
    tunable factor (defaulting to 2, meaning the memory doubles, and with
    a factor of 1 mimicking the current state, where collection is done if
    1000 new objects are allocated). Aahz and Martin v. Löwis indicated
    that it was extremely unlikely that anything would be done about this
    unless Andrea submitted a patch (with doc patches and tests).

    Contributing thread:

    - `suggestion for smarter garbage collection in function of size
    (gc.set_collect_mem_growth(2))
    <http://mail.python.org/pipermail/python-dev/2005-December/059184.html>`__

    [TAM]

    ----------------------------------
    Adding zlib module to python25.dll
    ----------------------------------

    Thomas Heller and Martin v. Löwis had been discussing whether the zlib
    module should become builtin, at least on Windows (i.e. part of
    python25.dll). This would simplify both the build process and py2exe,
    the latter could then bootstrap extraction from the compressed file
    just with pythonxy.dll, but this is currently not done, because the
    pythoncore.vcproj would then not be buildable anymore unless you also
    have the right version of zlib on disk. To solve this problem, Thomas
    proposed that the Python release could incorporate a copy of zlib,
    primarily for use on Windows (with the project files appropriately
    adjusted). This change was later made.

    Contributing thread:

    - `Incorporation of zlib sources into Python subversion
    <http://mail.python.org/pipermail/python-dev/2005-December/058873.html>`__

    [TAM]

    ----------------------------------------
    Procedure for fixing bugs in ElementTree
    ----------------------------------------

    Neal Norwitz found a few bugs in ElementTree and asked what the
    procedure was, since the ElementTree module is maintained externally
    by Fredrik Lundh. The answer was to post the bug to sourceforge as
    usual, and and assign it to Fredrik Lundh. The ElementTree in the
    Python SVN trunk should only have critical patches committed - all
    other patches would be applied by Fredrik to his externally
    distributed ElementTree package, and imported to the Python SVN trunk
    after the next release of ElementTree.

    Contributing thread:

    - `ref leak in element tree/pyexpat
    <http://mail.python.org/pipermail/python-dev/2005-December/058872.html>`__

    [SJB]

    ---------------------------------------
    Starting enumerate with non-zero values
    ---------------------------------------

    Can enumerate start somewhere other than zero? Answer: it complicates
    the API too much; if you want an arbitrary slice, then make it
    explicitly a slice.

    Contributing thread:

    - `synchronized enumerate
    <http://mail.python.org/pipermail/python-dev/2005-December/058896.html>`__

    [Jim Jewett]

    ------------------
    Are sets mappings?
    ------------------

    This spun out of the default comparisons discussion; when deciding what
    could be "sensibly" compared, (or even how best to teach python) there
    was a discussion of more abstract types. It wasn't clear where to put sets..

    Contributing thread:

    - `Sets are mappings?
    <http://mail.python.org/pipermail/python-dev/2005-December/058923.html>`__

    [Jim Jewett]

    ---------------------
    Local socket timeouts
    ---------------------

    If you want your network client to eventually give up on failed
    connections, you need to set a timeout - but you have to do that at
    the socket level, instead of in the library that you're actually
    using. (There are other problems with the current method too, such as
    being too global, or not quite acting as expected.)

    It was agreed that people should be able to handle timeout settings
    from the networking library that they actually use, but I don't think
    there are patches yet.

    Contributing thread:

    - `timeout options in high-level networking modules
    <http://mail.python.org/pipermail/python-dev/2005-December/058996.html>`__

    [Jim Jewett]

    ================
    Deferred Threads
    ================

    - `Build failure and problem on Windows
    <http://mail.python.org/pipermail/python-dev/2005-December/058918.html>`__


    ===============
    Skipped Threads
    ===============
    - `PEP 8 updates/clarifications, function/method style
    <http://mail.python.org/pipermail/python-dev/2005-December/058835.html>`__
    - `DRAFT: python-dev summary for 2005-11-16 to 2005-11-31
    <http://mail.python.org/pipermail/python-dev/2005-December/058869.html>`__
    - `[Python-checkins] commit of r41497 -python/trunk/Lib/test
    <http://mail.python.org/pipermail/python-dev/2005-December/058871.html>`__
    - `fresh checkout won't build
    <http://mail.python.org/pipermail/python-dev/2005-December/058876.html>`__
    - `fixing log messages
    <http://mail.python.org/pipermail/python-dev/2005-December/058883.html>`__
    - `(no subject)
    <http://mail.python.org/pipermail/python-dev/2005-December/058916.html>`__
    - `os.startfile with optional second parameter
    <http://mail.python.org/pipermail/python-dev/2005-December/058919.html>`__
    - `[OT] Fwd: a new python port: iPod
    <http://mail.python.org/pipermail/python-dev/2005-December/058920.html>`__
    - `Patch to make unittest.TestCase easier to subclass
    <http://mail.python.org/pipermail/python-dev/2005-December/058995.html>`__
    - `Patch reviews &amp; request for patch review
    <http://mail.python.org/pipermail/python-dev/2005-December/059027.html>`__
    - `Weekly Python Patch/Bug Summary
    <http://mail.python.org/pipermail/python-dev/2005-December/059031.html>`__
    - `A few questions about setobject
    <http://mail.python.org/pipermail/python-dev/2005-December/059091.html>`__
    - `Small any/all enhancement
    <http://mail.python.org/pipermail/python-dev/2005-December/059127.html>`__
    - `floating point literals don't work in non-US locale in 2.5
    <http://mail.python.org/pipermail/python-dev/2005-December/059176.html>`__
    - `JOB OPENING: Implementor for Python and Search
    <http://mail.python.org/pipermail/python-dev/2005-December/059183.html>`__
    - `PyCon TX 2006: Early-bird registration ends Dec. 31!
    <http://mail.python.org/pipermail/python-dev/2005-December/059195.html>`__
    - `set.copy documentation string
    <http://mail.python.org/pipermail/python-dev/2005-December/059222.html>`__
    - `Bug in Py_InitModule4
    <http://mail.python.org/pipermail/python-dev/2005-December/059272.html>`__
    - `floating point literals don't work in non-USlocale in 2.5
    <http://mail.python.org/pipermail/python-dev/2005-December/059290.html>`__
    - `slight inconsistency in svn checkin email subject lines
    <http://mail.python.org/pipermail/python-dev/2005-December/059335.html>`__
    - `Gaming on Sunday (Jan 1)
    <http://mail.python.org/pipermail/python-dev/2005-December/059339.html>`__




    ========
    Epilogue
    ========

    This is a summary of traffic on the `python-dev mailing list`_ from
    December 16, 2005 through December 31, 2005.
    It is intended to inform the wider Python community of on-going
    developments on the list on a semi-monthly basis. An archive_ of
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    An `RSS feed`_ of the titles of the summaries is available.
    You can also watch comp.lang.python or comp.lang.python.announce for
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    This is the 10th summary written by the python-dev summary duopoly of
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    To contact us, please send email:

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    Do *not* post to comp.lang.python if you wish to reach us.

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    --------------------
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    To comment on anything mentioned here, just post to
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    -------------------------
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    ... _python-dev: http://www.python.org/dev/
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    Tony Meyer, Jan 20, 2006
    #1
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