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import os
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dir = os.getcwd()
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subdir = os.listdir(dir)
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for i in subdir:
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path = os.path.join(dir, i)
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if os.path.isdir(path):
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end_dir = os.listdir(path)
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for i in range(len(end_dir)):
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newname = end_dir[i][0:50]
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os.rename(os.path.join(path, end_dir[
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i]), os.path.join(path, newname))
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