Thomas Grainger <tagr...@gmail.com> added the comment:

yeah this is normal. on Python 3.8 mac multiprocessing switched to spawn

you have to use 
https://docs.python.org/3/library/multiprocessing.shared_memory.html to share 
content between processes or pass it to be pickled in the args of imap_unordered

https://bugs.python.org/issue33725

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nosy: +graingert

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<https://bugs.python.org/issue39931>
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