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dS )ExtensionFileLoaderz]Loader for extension modules.
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d| _ dS )z Invalidate the directory mtime.ru N)ra )r r r r rP 5 s z FileFinder.invalidate_cachesc C s* | |}|dkrdg fS |j|jp&g fS )zTry to find a loader for the specified module, or the namespace
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