Alexander Steppke <astep...@gmail.com> added the comment:
Hi David,
I followed your suggestion and tried to reproduce the problem without the
tempfile module. It turns out that is indeed an underlying issue. I am not sure
what the root cause is but now this is even a bigger problem: read() returns
information from some file/memory that it was never intended to access.
The session looks similar to the tempfile session:
>>> tmp = open('tmp', 'w+t')
>>> tmp.read()
''
>>> tmp.write('test')
>>> tmp.read()
'hp\'\x02\xe4\xb9>7\x80\x88\x81\x02\x01\x00\x00\x00\x00\x00\x00\x00\x12\x00\x00\
x00\xe86(\x02p\x11\x8d\x02\x01\x00\x00\x00@\xfd)\x02\xe7Y\x9aN\x01\x00\x00\x00\x
00\x00\x00\x00\x14\x00\x00\x00\x087(\x02\x00\x00\x00\x00\xe9Y\x0b\xa2\x00\x93+\x
02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x9b,\x02\x02\x00\x00\x00\xe06(\x02\xc0W5\
At the moment the bug could only be reproduced using CPython 2.7.1 on Windows
XP and Windows 7.
Alexander
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<http://bugs.python.org/issue13171>
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