[issue20658] os.environ.clear() fails with empty keys (posix.unsetenv)

[STINNER Victor]

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

For the very specific case of os.environ.clear(), the C function clearenv() could be used if available.

While clearenv() is available in the glibc, it's not a POSIX function.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue20658>
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