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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<http://bugs.python.org/issue20658>
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