Antoine Pitrou added the comment:

Another possibility if you don't mind a copy is to use int.from_bytes():

>>> p = int.from_bytes(a, 'little')
>>> q = int.from_bytes(b, 'little')
>>> (p ^ q).to_bytes(len(a), 'little')
b'qPP'

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue19251>
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