Antoine Pitrou added the comment:

The encoding used impacts the result:

>>> s = 'abc\udcc3\udca9'
>>> s.encode('ascii', 'surrogateescape').decode('ascii', 'replace')
'abc��'
>>> s.encode('utf-8', 'surrogateescape').decode('utf-8', 'replace')
'abcé'

The original string ('abc\udcc3\udca9') was obtained by decoding a valid utf-8 
string with the 'ascii' codec and the 'surrogateescape' error handler.

If anything, the default encoding should probably be 
sys.getfilesystemencoding().

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue18814>
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