[issue20104] expose posix_spawn(p)

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

For Python 3.7, I discussed with Pablo and he seems to be ok to remove the function from Python 3.7, to get more time to polish the API in the master branch (future Python 3.8).

Can someone please write a PR to remove the function from the 3.7 branch?

I dislike the idea of applying a significant change on 3.7 to change the API between a beta and a rc release. IMHO it's too late, and we might find some API bugs. I would prefer to get more feedback on the API before setting it in stone (once a 3.x.0 version is released, it's really hard to change the API).

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priority: deferred blocker -> release blocker

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<https://bugs.python.org/issue20104>
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