INADA Naoki added the comment:
FYI, I found a workaround.
https://github.com/PyMySQL/PyMySQL/pull/409
_table = [chr(i) for i in range(128)] + [chr(i) for i in range(0xdc80, 0xdd00)]
def decode_surroundescape(s):
return s.decode('latin1').translate(_table)
In [15]: data = b'\xff' * 1024 * 1024
In [16]: data.decode('ascii', 'surrogateescape') == decode_surroundescape(data)
Out[16]: True
In [17]: %timeit data.decode('ascii', 'surrogateescape')
1 loops, best of 3: 394 ms per loop
In [18]: %timeit decode_surroundescape(data)
10 loops, best of 3: 40 ms per loop
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