Dominic Littlewood <11dlittlew...@gmail.com> added the comment:

Okay, I've encountered a snag. To use meta path finders, if the path is None, 
it's sometimes okay to substitute self.path, and sometimes not. The only way to 
make absolutely sure the finder works correctly is to change sys.path. To use 
namespace packages (and possibly some other types of modules finders might 
produce), it's also necessary to adjust sys.modules. However, both of these 
things may cause problems if a hook wants to import something in the standard 
way so it can run properly. This will require some thought.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38721>
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