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I'd like to piggyback on this issue if okay :D
I have some zipfiles I'm working with that contain junk in the extra 
fields. The ZipFile object croaks at the call to the 
ZipInfo._decodeExtra() call when it could really just ignore the error.
Example of traceback:
>>> zf = zipfile.ZipFile('bad.zip', 'r')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "zipfile.py", line 346, in __init__
 self._GetContents()
 File "zipfile.py", line 366, in _GetContents
 self._RealGetContents()
 File "zipfile.py", line 424, in _RealGetContents
 x._decodeExtra()
 File "zipfile.py", line 267, in _decodeExtra
 tp, ln = unpack('<hh', extra[:4])
 File "/usr/lib/python2.5/struct.py", line 87, in unpack
 return o.unpack(s)
struct.error: unpack requires a string argument of length 4
While I'm working to track down the source of the "extra junk" -- this 
type of error falls into the same category: Python zipfile hits an 
issue that most zip tools are fine with.