[issue40094] Add os.waitstatus_to_exitcode() function

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:


New changeset 16d75675d2ad2454f6dfbf333c94e6237df36018 by Victor Stinner in branch 'master':
bpo-31160: Fix race condition in test_os.PtyTests (GH-19263)
https://github.com/python/cpython/commit/16d75675d2ad2454f6dfbf333c94e6237df36018


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<https://bugs.python.org/issue40094>
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