[issue39395] The os module should unset() environment variable at exit

[STINNER Victor]

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


New changeset b8d1262e8afe7b907b4a394a191739571092acdb by Victor Stinner in branch 'master':
bpo-39395: putenv() and unsetenv() always available (GH-18135)
https://github.com/python/cpython/commit/b8d1262e8afe7b907b4a394a191739571092acdb


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<https://bugs.python.org/issue39395>
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