python-dev Summary for 2005-03-01 through 2005-03-15

[The HTML version of this Summary is available at

Summary Announcements

Second to last summary for me
Just a reminder, after this Summary there is only one more left for me to 
write.  After that Tim Lesher, Tony Meyer, and Steven Bethard will be taking over.

See you at PyCon!
PyCon_ is practically upon us!  If you are going to be there, great!  Please 
feel free to say hello if you run into me (will be at the sprints and the 
conference Wednesday and Thursday; skipping Friday to see a friend).  Always 
happy to stop-and-chat.

... _PyCon: http://www.pycon.org/

2.4.1 should be out soon
Python 2.4c2 has now been released.  Assuming no major issues come up, 2.4 
final will be out March 29; day after PyCon.

But in order to make sure no issues come up, we need the code to be tested! 
Please get the code and run the regression tests.  If you are on a UNIX system 
it is as easy as running ``make test`` (``make testall`` is even better).  The 
tests can also be run on non-UNIX systems; see 
http://docs.python.org/lib/regrtest.html on how.


2.4 should be out soon
Python 2.4.1c1 was releaseed, but enough bugs were found and subsequently fixed 
that c2 release will occur before 2.4 final comes out.

Contributing threads:
   - `2.4.1c1 March 10th, 2.4.1 March 17th 
   - `BRANCH FREEZE for 2.4.1rc1, 0000 UTC, 2005-03-10 
   - `branch release24-maint is unfrozen, 2.4.1rc2? 
   - `os.access and Unicode 
   - `RELEASED Python 2.4.1, release candidate 1 
   - `distutils fix for building Zope against Python 2.4.1c1 
   - `Python2.4.1c1 and win32com 
   - `Open issues for 2.4.1 

Getting state of all threads in interpreter
Florent Guillaume wrote some code for Zope that returned the current state of 
all threads in the interpreter, regardless of whether they were hung or not. 
Tim Peters suggested someone write up some code so that this could be made 
available in Python itself.

Fazal Majid has volunteered to implement this.

Contributing threads:
   - `Useful thread project for 2.5? 

No new features in micro releases
A bug in os.access() not allowing Unicode strings triggered the discussion of 
whether it was a bugfix to repair the issue or a new feature.  In the end it 
was decided it was a bugfix.  But the point was specified that micro releases 
should never have any new feature, no matter how small.

Contributing threads:
   - `[Python-checkins] python/dist/src/Modules ossaudiodev.c, 1.35, 1.36 
   - `No new features 
   - `os.access and Unicode 
   - `rationale for the no-new-features approach 

Python wins Jolt "Productivity Award"
Python was runner-up in the `15th annual Jolt Awards`_ in the category of 
"Languages and Development Environments", being given the "Productivity Award". 
  Python is now award-winning.  =)

... _15th annual Jolt Awards: 

Contributing threads:
   - `FWD: SD MAgazine.com - Jolt Awards Winners 
   - `Python 2.4 won the "Jolt productivity award" last night 

New built-ins: any() and all()
Python 2.5 gains two new built-ins: any(), which returns True if the iterable 
passed to it contains any true items, and all(), which returns True if all the 
items in the iterable passed to it are true.

Contributing threads:
   - `Adding any() and all() 

Abbreviating list comprehensions
The idea of allowing list comprehensions when the item being appended to the 
new list is passed directly in was proposed: ``[x in seq if f(x)`` would be 
equivalent to ``[x for x in seq if f(x)]``.

The debate on this one is still going, but my gut says it won't be accepted; 
TOOWTDI and all.

Contributing threads:
   - `Adding any() and all() 
   - `comprehension abbreviation 

sum() semantics discussed
Guido's blog entry on `the fate of reduce() in Python 3000`_ (which reiterated 
Guido's plan to cut map(), reduce(), filter() and lambdas (what about zip()?) 
caused a huge discussion on whether sum() worked the best way possible.  As it 
stands now, sum() only accepts a sequence of numbers (sort of; more later) and 
its optional second argument works as an initial value to build off of.  You 
can abuse the second argument to allow for adding other things (such as 
``sum([[1], [2], [3]], [])``), but don't do that.  =)

The suggestion was put forth of making the second argument more of a default 
argument if the passed-in sequence was empty.  Otherwise the second argument 
would be ignored.  But further discussion solidified the idea that sum() works 
quite well as it is and thus won't be changed in Python 3000.

... _the fate of reduce() in Python 3000: 

Contributing threads:
   - `sum() <http://mail.python.org/pipermail/python-dev/2005-March/052067.html>`__
   - `Rationale for sum()'s design? 

Experimenting with subversion
note: written by Tony Meyer

Martin v. Löwis did an automatic conversion of the Python CVS repository to
(fellow Jolt winner) `Subversion`_, to see how well the process worked.  He
discovered that although the conversion process takes several hours, there
were only minor problems with the conversion.  It seems likely that if
SourceForge does offer subversion repositories, as they have indicated they
will, then Python will switch to this.  Martin plans to continue collecting
issues/complaints about the conversion conversion and to integrate solutions.

... _Subversion: http://subversion.tigris.org

Contributing threads:
    - `Migrating to subversion 

Ordered Dictionaries
note: written by Tony Meyer

A suggestion was made that hashed sets and maps that iterate in the order
that the keys were added to the set/map could be added to 'collections'.  The
original use case presented was to remove duplicates without changing order,
but it was pointed out that there are other, better, ways to do this.
Although better use cases were presented, the consensus was that (in Barry
Warsaw's words) "while the concept of 'an ordered dictionary' is nice and
seemingly generic enough, [the] exact semantics and other design factors
will either tend to push the stdlib implementation into ever more
complexity, or won't prevent people from continuing to roll their own
because the stdlib version 'isn't quite right'".  A `cookbook recipe`_ is
available, however.

... _cookbook recipe: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/107747

Contributing threads:
    - `LinkedHashSet/LinkedHashMap equivalents 

Easier decorators
note: written by Tony Meyer

Nick Coghlan suggested that an update_meta() function be added that copies
across appropriate metadata of functions being decorated (such as __name__,
__doc__, and __dict__), to make the process of decorating simpler, and more
robust in the long term (e.g. if a new attribute should be copied in the
future, update_meta can be updated, rather than individual decorators).  A
`patch`_ implementing this behaviour was submitted.

... _patch: http://www.python.org/sf/1161819

Contributing threads:
    - `@deprecated (was: Useful thread project for 2.5?) 
    - `func.update_meta (was: @deprecated) 
    - `(no subject) 

Skipped Threads
+ Re: python-dev Summary for 2005-01-16 through	2005-01-31
+ Documentation for __new__
+ Decimal & returning NotImplemented (or not)
+ itemgetter/attrgetter extension
+ Re: [Python-checkins] python/dist/src/Lib/idlelib NEWS.txt,, idlever.py,,
+ code blocks using 'for' loops and generators
+ can we stop pretending _PyTyple_Lookup is internal?



This is a summary of traffic on the `python-dev mailing list`_ from
March 01, 2005 through March 15, 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
previous summaries is available online.

An `RSS feed`_ of the titles of the summaries is available.
You can also watch comp.lang.python or comp.lang.python.announce for
new summaries (or through their email gateways of python-list or
python-announce, respectively, as found at http://mail.python.org).

This is the sixieth summary written by Brett Cannon (sprinting my Spring Break 

To contact me, please send email to brett at python.org.  Do *not*
post to comp.lang.python if you wish to reach me.

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If you are looking for a way to expand your knowledge of Python's
development and inner-workings, consider writing the python-dev
Summaries yourself!  I am willing to hand over the reins to someone
who is willing to do a comparable or better job of writing the
Summaries.  If you are interested, please email me at
brett at python.org.

Commenting on Topics

To comment on anything mentioned here, just post to
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How to Read the Summaries

The in-development version of the documentation for Python can be
found at http://www.python.org/dev/doc/devel/ and should be used when
looking up any documentation for new code; otherwise use the current
documentation as found at http://docs.python.org/ .  PEPs (Python
Enhancement Proposals) are located at http://www.python.org/peps/ .
To view files in the Python CVS online, go to
http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/python/ .  Reported
bugs and suggested patches can be found at the SourceForge_ project

Please note that this summary is written using reStructuredText_.
Any unfamiliar punctuation is probably markup for reST_ (otherwise it
is probably regular expression syntax or a typo =); you can safely
ignore it.  I do suggest learning reST, though; it's simple and is
accepted for `PEP markup`_ and can be turned into many different
formats like HTML and LaTeX.  Unfortunately, even though reST is
standardized, the wonders of programs that like to reformat text do
not allow me to 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`_.

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bac1 (39)
3/21/2005 4:04:15 PM
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