STINNER Victor added the comment:

"""
(4) str in __all__ (list of str):

os.py:

    if "putenv" not in __all__:
        __all__.append("putenv")
"""

For this example: "putenv" is probably interned by "def putenv(...)". "putenv" 
string and the name of the function are the same constant. When a function is 
defined, it is stored in the locals dictionary, so the key ("putenv") is 
interned by PyDict_SetItem().

So dict is not used explicitly, but implicitly by the namespace.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue16286>
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