STINNER Victor <victor.stin...@haypocalc.com> added the comment:

Python 3.1 accepts duplicate variables (str name, bytes name). It creates the 
two variables is a random order:

>>> subprocess.call(['env'], env={'xx': 'str', b'xx': 'bytes'})
xx=str
xx=bytes
0
>>> subprocess.call(['env'], env={'xxx': 'str', b'xxx': 'bytes'})
xxx=bytes
xxx=str
0

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue8640>
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