[issue40106] multiprocessor spawn

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[issue40106] multiprocessor spawn

B. L. Alterman added the comment: @Mouse, using "multiprocess" instead of "multiprocessing" will not work if you're passing a class that inherits from ABC. "dill" is one of "multiprocess"'s dependencies and "dill" can't pickle an _abc_data object (https://github.com/uqfoundation/dill/issues/

[issue40106] multiprocessor spawn

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[issue40106] multiprocessor spawn

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[issue40106] multiprocessor spawn

New submission from Mouse : MacOS Catalina 10.15.3 and 10.15.4. Python-3.8.2 (also tested with 3.7.7, which confirmed the problem being in the fix described in https://bugs.python.org/issue33725. Trying to use "multiprocessor" with Python-3.8 and with the new default of `set_start_method('sp