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