STINNER Victor added the comment:

By the way, Python allows also to set an environment with a name containing 
"=", whereas getenv/setenv/unsetenv doesn't.

$ env -i python -c 'import pprint, posix, os; os.environ["a="]="1"; 
print(os.environ); posix.unsetenv("a=")'

environ({'a=': '1'})
Traceback (most recent call last):
  File "<string>", line 1, in <module>
OSError: [Errno 22] Invalid argument

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue20658>
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