[issue33169] importlib.invalidate_caches() doesn't clear all caches

[Brett Cannon]

Brett Cannon <brett at python.org> added the comment:

OK, I will update importlib.machinery.PathFinder.invalidate_caches() to also drop None from sys.path_importer_cache (objects that are not None and do not define invalidate_caches() will be left alone just like they are today). I should hopefully be able to get to this before b4.

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assignee:  -> brett.cannon
versions: +Python 3.7

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<https://bugs.python.org/issue33169>
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