Tim Peters added the comment:
I have no idea what was done to pickle for Python3, but this line works for me
to unpickle a Python2 protocol 2 datetime pickle under Python3, where P2 is the
Python2 pickle string:
pickle.loads(bytes(P2, encoding='latin1'), encoding='bytes')
For example,
>>> P2
'\x80\x02cdatetime\ndatetime\nq\x00U\n\x07Þ\x07\x12\r%%\x06á¸q\x01\x85q\x02Rq\x03.'
>>> pickle.loads(bytes(P2, encoding='latin1'), encoding='bytes')
datetime.datetime(2014, 7, 18, 13, 37, 37, 451000)
I don't understand the Python3 loads() docs with respect to the "encoding" and
"errors" arguments, and can't guess whether this is the intended way. It seems
at best highly obscure. But hard to argue with something that works ;-)
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<http://bugs.python.org/issue22005>
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