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