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

[Brett Cannon]

Brett Cannon added the comment:

As for Finder containing nothing significant, that's a side-effect of the cleanup and why Finder should get deprecated, especially since the contract that a Finder implements find_module() is no longer being enforced. Tying MetaPathFinder and PathEntryFinder together because they are conceptually finders is just not useful from a programming perspective since their APIs have no overlap except for invalidate_caches(), which if generalized, is just happenstance and not by explicit design.

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