[issue14080] Sporadic test_imp failure

[Brett Cannon]

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

importlib.invalidate_caches() would become a permanent thing if the directory listdir cache approach stays and importlib gets bootstrapped. But it would be made more general to work for any and all loaders and not be specific to importlib (e.g. 3rd-party importers would also get cleared). It's an unfortunate side-effect of mtime of directories not being granular enough.

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<http://bugs.python.org/issue14080>
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