[issue3187] os.listdir can return byte strings

[STINNER Victor]

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

> The most generic way of allowing all bytes-alike objects is to write:
>     path = bytes(path)

If you use that, any unicode may fails and the function will always return 
unicode. The goal is to get:
  func(bytes)->bytes
  func(bytearray)->bytes (or maybe bytearray, it doesn't matter)
  func(unicode)->unicode

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