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

[STINNER Victor]

STINNER Victor added the comment:

> It comes from the real environment.

Oh. It looks possible to define an environment variable with an empty key, but not to remove it:

$ env -i =value python -c 'import pprint, os; pprint.pprint(os.environ); del os.environ[""]'
environ({'': 'value'})
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "Lib/os.py", line 662, in __delitem__
    self.unsetenv(encodedkey)
OSError: [Errno 22] Invalid argument

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