STINNER Victor <victor.stin...@haypocalc.com> added the comment:
> 1) A multiprocessing worker can not return (return, not raise!) an
> Exception. (...) raise an error if multiple arguments are required:
> TypeError: ('__init__() takes exactly 2 arguments (1 given)',
> <class '__main__.MyException'>, ())
This problem comes from pickle, not multiprocessing: issue #1692335.
> 2) A multiprocessing worker can not return an hashlib Object.
> If this is attempted, pickle returns an error:
It is related to pickle and hashlib: #11771
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue9592>
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