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

[STINNER Victor]

STINNER Victor added the comment:

putenv("=value") does nothing: it doesn't create a variable with an empty name. You can test with the attach test_empty_env_var.py script (written for Linux).

Attached reject_empty_env_var.patch patch modifies posix.putenv() to raise a ValueError if the name is empty.

The patch is incomplete, the Windows part should also be modified. But I didn't test yet if Windows supports variables with empty name.

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nosy: +haypo
Added file: http://bugs.python.org/file34132/test_empty_env_var.py

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