Brett Cannon added the comment:

__file__ could be None if __spec__.origin is None. The import machinery doesn't 
introspect on __file__ for anything, so it won't break import if __file__ has 
alternative values. In general, though, normal imports will set __file__ to a 
string.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue27238>
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