[issue19946] Have multiprocessing raise ImportError when spawning a process that can't find the "main" module

[Nick Coghlan]

Nick Coghlan added the comment:

Rerunning main in the subprocess has always been a slightly dubious feature
of multiprocessing, but IIRC it's a necessary hack to ensure pickle
compatibility for things defined in __main__. Using "runpy.run_path" would
be a better solution, but we'll need to add the "target" parameter that
missed the beta1 deadline.

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<http://bugs.python.org/issue19946>
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