Elad Lahav <e2la...@gmail.com> added the comment:

"Your script contains a bug (there is no definition of 'exec_fn')"

Told you I wasn't much of a Python developer ;-) 
This was just copy-pasted from spawn.py and I missed the fact that exec_fn() is 
not a library function.

Your last comment wasn't clear - do you see this problem on macOS? Is it only 
after you fixed the example? For me it hangs with the bug, as the problem 
occurs before the call to exec_fn().

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39763>
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