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    path segments of the old name will be pruned until either the
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    filenames is a list of the names of the non-directory files in dirpath.
    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).

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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
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    tuples for the directory and its subdirectories are generated.

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    systems that support them.  In order to get this functionality, set the
    optional argument 'followlinks' to true.

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        print(root, "consumes", end="")
        print(sum([getsize(join(root, name)) for name in files]), end="")
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Execute file with arguments from args in a subprocess.
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