[issue3187] os.listdir can return byte strings

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

Guido compiled my patches here: http://codereview.appspot.com/3055

My patches allows bytes for fnmatch.filter(), glob.glob1(), 
os.path.join() and open().

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3187>
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