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    Note that the names in the lists are just names, with no path components.
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    dirpath, do os.path.join(dirpath, name).

    If optional arg 'topdown' is true or not specified, the triple for a
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    (directories are generated top down).  If topdown is false, the triple
    for a directory is generated after the triples for all of its
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    directories in dirnames have already been generated by the time dirnames
    itself is generated. No matter the value of topdown, the list of
    subdirectories is retrieved before the tuples for the directory and its
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    systems that support them.  In order to get this functionality, set the
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