Matthias Bussonnier <bussonniermatth...@gmail.com> added the comment:

Thanks.

That's an annoying side effect of having spawn by default on macOS then. 

Could it be possible in `pool.map()` to detect that some of the objects are 
from main and would fail and then raise an error message in the parent process 
before starting the children ?

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41041>
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