R. David Murray <rdmur...@bitdance.com> added the comment:

Well, checking if the token is there before adding it would certainly be a fix, 
but I think it would be worth understanding why it gets added if it is already 
there, because instead perhaps it is possible to simply remove the adding code 
from os.py.  Removing code is nice.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue11078>
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