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import os
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def list_files(startpath):
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    for root, dirs, files in os.walk(startpath):
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        level = root.replace(startpath, '').count(os.sep)
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        indent = ' ' * 4 * (level)
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        print('{}{}/'.format(indent, os.path.basename(root)))
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        subindent = ' ' * 4 * (level + 1)
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        for f in files:
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            print('{}{}'.format(subindent, f))
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