python3: unpickle tzinfo pickled with python2

[ricolai]

Hi,

Yes, pickle is not guaranteed to be cross-compatible between python versions, but it's so close !!

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Dump in python 2:

import pickle, pytz, datetime
with open("date.pickle", "wb") as fp:
    pickle.dump(pytz.timezone('Europe/Paris').localize(datetime.datetime(2016, 1, 1)), fp)

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Load in python 3:

import pickle
with open("date.pickle", "rb") as fp:
    pickle.load(fp, encoding="bytes") # encoding="bytes" so that pickle can load old str
# fails with
# AttributeError: 'bytes' object has no attribute 'encode'
# because pytz.zone calls 'ascii(zone)' for something that is already in bytes

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pytz.ascii should not .encode 'bytes', that's it !

Thanks !