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> I appear to be somehow getting child processes where __main__.__file__ is
> set, but __main__.__spec__ is not.
That seems to be true for the __main__ module even when multiprocessing is not involved. Running a file /tmp/foo.py containing
 import sys
 print(sys.modules['__main__'].__spec__, sys.modules['__main__'].__file__)
I get output
 None /tmp/foo.py
I am confused by why you would ever want to load by module name rather than file name. What problem would that fix? If the idea is just to support importing a main module without a .py extension, isn't __file__ good enough?