[Guido]
>  > >         I think we need a hook here so that Marc-Andre can implement
>  > >         walk-me-up-Scotty; or Tim Peters could implement a policy that
>  > >         requires all imports to use the full module name, even from
>  > >         within the same package.

Hmm, after thinking about it, I can't see these as "import 
hooks". At least, if you are installing these system-wide, 
these are changing the semantics of "import", not grabbing 
code from strange places, or transforming .xyz files into 
Python or ...

I can have working code; now add some mxX or TP extension 
and have existing code (not using the new extension) break.

OTOH, if MAL / TP provides an importer, and fixes that 
importer to follow their preferred policy, that's fine; and I can 
pretend that that's an "import hook".

- Gordon