Stepan Kasal added the comment:

I agree that reading from a file open for write should be forbidden, no matter 
whether ZipFile was called with fp or a name.

Actually, it is not yet forbidden, and two of the tests in the zipfile.py test 
suite do actually rely on this misfeature.
The first chunk in the patch 
http://bugs.python.org/file24624/Proposed-fix-of-issue14099-second.patch 
contains a fix for this bug in test suite.

OTOH, decompressing several files for a given zip file simultaneously does not 
sound that bad.  You know, with all the current file managers, people look at a 
zip as if it were kind of a directory.

----------
nosy: +kasal

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