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    dirpath, do os.path.join(dirpath, name).

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    directory is generated before the triples for any of its subdirectories
    (directories are generated top down).  If topdown is false, the triple
    for a directory is generated after the triples for all of its
    subdirectories (directories are generated bottom up).

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    (e.g., via del or slice assignment), and walk will only recurse into the
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