Eric Snow <ericsnowcurren...@gmail.com> added the comment:

Ah, namespace packages. :)  Yeah, the code is not taking the "spec.loader is 
None" case into account.  I expect the fix would be to add handling of that 
case a few lines up in the code, right after handling BuiltinImporter and 
FrozenImporter.  Offhand I'm not sure if the "type" should be _PKG_DIRECTORY or 
some new one just for namespace packages.  How does imp.find_module() (on which 
modulefinder._find_module() is based) respond to namespace packages?

[1] 
https://docs.python.org/3/library/importlib.html#importlib.machinery.ModuleSpec.loader

----------
nosy: +barry, brett.cannon, eric.smith, eric.snow

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<https://bugs.python.org/issue40350>
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