STINNER Victor added the comment:
This issue may be related or a duplicate of #11461.
> For example codecs.utf_16_le_decode(b'\x00\xd8\x00') should return ('', 0),
> but raises UnicodeDecodeError.
Only incremental decoder should return partial results. Other decoders are
strict and (usually) stateless.
$ ./python
>>> import codecs
>>> decoder = codecs.getdecoder('utf8')
>>> decoder('\u20ac'.encode('utf8'), 'strict')
('€', 3)
>>> decoder('\u20ac'.encode('utf8')[:2], 'strict')
UnicodeDecodeError: 'utf-8' codec can't decode bytes in position 0-1:
unexpected end of data
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<http://bugs.python.org/issue15278>
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