sys.path_importer_cache
A dictionary acting as a cache for finder objects. The keys are paths that have been passed to sys.path_hooks and the values are the finders that are found. If a path is a valid file system path but no finder is found on sys.path_hooks then None is stored.
Originally specified in PEP 302.
Changed in version 3.3: None is stored instead of imp.NullImporter when no finder is found.
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