Python-URL! - weekly Python news and links (Jul 28)

Gabriel Genellina python-url at
Tue Jul 28 16:07:29 CEST 2009

QOTW:  "But there's another principle at work here that's less well known, and
that was first articulated to me by Robert Dewar: You can remove linear
factors by profiling, but it's much harder to undo bad algorithmic decisions. 
In particular, whether a program runs in O(n) or O(n^2) sometimes depends on
decisions that have to be frozen fairly early in the design." - Andrew Koenig

    Comparing the performance of the same algorithm using many compilers:
    CPython, psyco, Cython, ShedSkin, Unladen Swallow, Java, C and D:
    MRAB has written a new implementation of re module with many new
    features, and he's looking for feedback:
    Importing two modules with the same name from different directories:
    Cleanly exiting an application, even if it gets killed by a signal:
    How can a child thread notify a parent thread of its status?
    How to attach a docstring to global constants/variables?
    In Python -unlike other languages- it does not make sense to treat
    numbers (scalars) as vectors of length 1:
    isinstance may take a tuple of types as its second argument: why a
    tuple, and not a list, or a set?
    How to overcome the normal 2GB allocation limit of Windows XP, 32bits:
    Distinguishing active generators from exhausted ones:
    Peter Otten must be, undoubtedly, Sherlock Holmes reincarnated:
    And Piet van Oostrum is not much behind him:
Everything Python-related you want is probably one or two clicks away in
these pages:'s Python Language Website is the traditional
    center of Pythonia
    Notice especially the master FAQ

    PythonWare complements the digest you're reading with the
    marvelous daily python url

    Just beginning with Python?  This page is a great place to start:

    The Python Papers aims to publish "the efforts of Python enthusiasts":
    The Python Magazine is a technical monthly devoted to Python:

    Readers have recommended the "Planet" sites:

    comp.lang.python.announce announces new Python software.  Be
    sure to scan this newsgroup weekly.

    Python411 indexes "podcasts ... to help people learn Python ..."
    Updates appear more-than-weekly:

    The Python Package Index catalogues packages.

    Much of Python's real work takes place on Special-Interest Group
    mailing lists

    Python Success Stories--from air-traffic control to on-line
    match-making--can inspire you or decision-makers to whom you're
    subject with a vision of what the language makes practical.

    The Python Software Foundation (PSF) has replaced the Python
    Consortium as an independent nexus of activity.  It has official
    responsibility for Python's development and maintenance.
    Among the ways you can support PSF is with a donation.

    The Summary of Python Tracker Issues is an automatically generated
    report summarizing new bugs, closed ones, and patch submissions.

    Although unmaintained since 2002, the Cetus collection of Python
    hyperlinks retains a few gems.

    Python FAQTS

    The Cookbook is a collaborative effort to capture useful and
    interesting recipes.

    Many Python conferences around the world are in preparation.
    Watch this space for links to them.

    Among several Python-oriented RSS/RDF feeds available, see:
    For more, see:
    The old Python "To-Do List" now lives principally in a
    SourceForge reincarnation. presents an intriguing approach to reference commentary.
    It already aggregates quite a bit of Python intelligence.

    Enjoy the *Python Magazine*.

    *Py: the Journal of the Python Language*

    Dr.Dobb's Portal is another source of Python news and articles:
    and Python articles regularly appear at IBM DeveloperWorks:

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