_filefinder2.py 文件源码

def activate():
        """Install the path-based import components."""
        if path_hook not in sys.path_hooks:
            sys.path_hooks.append(path_hook)
        # Resetting sys.path_importer_cache values,
        # to support the case where we have an implicit package inside an already loaded package,
        # since we need to replace the default importer.
        sys.path_importer_cache.clear()

        if PathFinder2 not in sys.meta_path:
            # Setting up the meta_path to change package finding logic
            sys.meta_path.append(PathFinder2)