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A PEP 302 meta path importer for finding optionally-vendored
or otherwise naturally-installed packages from root_name.
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Search first the vendor package then as a natural package.
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Return self when fullname starts with root_name and the
target module is one vendored through this importer.
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Iterate over the search path to locate and load fullname.
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Install this importer into sys.meta_path if not already present.
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