[issue15502] Meta path finders and path entry finders are different, but share an ABC

[Nick Coghlan]

Nick Coghlan added the comment:

As a final attempt at giving the path import machinery the emphasis it
deserves without misusing the "importer" term, how about:
1. "path import subsystem" for that whole section of the import machinery;
and
2. "path import finder" specifically for the meta path finder that
importlib calls "PathFinder" and the new docs currently call "path importer"

"path_importer_cache" would still be a bit of a misnomer, but that ship
sailed a long time ago.

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<http://bugs.python.org/issue15502>
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