[issue9172] zipfile.extractall always raises an OSError after successfully unzipping all files

[Antoine Pitrou]

Changes by Antoine Pitrou <pitrou at free.fr>:


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nosy: +amaury.forgeotdarc, ezio.melotti
versions: +Python 2.7, Python 3.1, Python 3.2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9172>
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