Serhiy Storchaka added the comment:

>>> ('\udcff' + 'qwerty').encode('utf-16le', 'surrogateescape')
b'\xff\xdcq\x00w\x00e\x00r\x00t\x00y\x00'
>>> ('\udcff' + 'qwerty').encode('utf-16le', 
>>> 'surrogateescape').decode('utf-16le', 'surrogateescape')
'\udcff\udcdcqwerty'
>>> ('\udcff' + 'qwerty').encode('utf-16le', 
>>> 'surrogateescape').decode('utf-16le', 'surrogateescape').encode('utf-16le', 
>>> 'surrogateescape')
b'\xff\xdc\xdc\xdcq\x00w\x00e\x00r\x00t\x00y\x00'
>>> ('\udcff' + 'qwerty').encode('utf-16le', 
>>> 'surrogateescape').decode('utf-16le', 'surrogateescape').encode('utf-16le', 
>>> 'surrogateescape').decode('utf-16le', 'surrogateescape')
'\udcff\udcdc\udcdc\udcdcqwerty'

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue18713>
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