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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""python diff.py file1 file2 diff"""
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import difflib
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import sys
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diff = difflib.unified_diff(
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open(sys.argv[1]).readlines(),
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open(sys.argv[2]).readlines())
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with open(sys.argv[3], 'w') as f:
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f.write(''.join(diff))
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