Nick Coghlan <ncogh...@gmail.com> added the comment:

The piece you're missing is that the interpreter state holds a direct reference 
to the import machinery in interp->importlib, and *that's* what gets used by 
the builtin __import__ implementation.

I'm beginning to think the thing to do is to simply say "yes, there are two 
copies of importlib._bootstrap". By default, the compiled in one is used, but 
you can replace it with the on-disk one by appropriately editing sys.meta_path 
and sys.path_hooks.

Trying to hide it isn't going to eliminate the potential problems - it's just 
going to move the problems around (and likely make them even more confusing in 
the process).

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue14657>
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