En Fri, 05 Jun 2009 00:12:25 -0300, John Machin <sjmac...@lexicon.net>
escribió:
> (2) This will stop processing on the first object in sys.modules that
> doesn't have a __file__ attribute. Since these objects aren't
> *guaranteed* to be modules,
Definitely not guaranteed to be modules. Python itself drops non-modules
in
there! Python 2.3 introduced four keys mapped to None -- one of these was
dropped in 2.4, but the other three are still there in 2.5 and 2.6:
In case someone wonders what all those None are: they're a "flag" telling
the import machinery that those modules don't exist (to avoid doing a
directory scan over and over, because Python<2.7 attempts first to do a
relative import, and only if unsuccessful attempts an absolute one)
C:\junk>\python23\python -c "import sys; print [k for (k, v) in
sys.modules.items() if v is None]"
['encodings.encodings', 'encodings.codecs', 'encodings.exceptions',
'encodings.types']
In this case, somewhere inside the encodings package, there are statements
like "import types" or "from types import ...", and Python could not find
types.py in the package directory.
--
Gabriel Genellina
--
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