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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Are there supported platforms on which setenv() is not supported.

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nosy: +serhiy.storchaka

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