python判断两个文件是否相同

#!/usr/bin/env python
# -*# coding: utf-8 -*-

import difflib

if __name__ == '__main__':
    # .splitlines(True)为保留了\r\n
    a = open("diff1.txt", "r").read().splitlines(True)
    b = open("diff3.txt", "r").read().splitlines(True)
    # difflib.context_diff(a, b[, fromfile][, tofile][, fromfiledate][, tofiledate][, n][, lineterm])
    # fromfile：a的文件名
    # tofile：b的文件名
    # fromfiledate：a文件的修改时间
    # tofiledate：b文件的修改时间
    # n：变化那一行前后n行展示，默认n=3
    # lineterm：打印出来的换行符，默认为\n
    diff = difflib.context_diff(a, b, fromfile='fromfile.txt', tofile='tofile.txt', n=0, lineterm="\n")
    result = "".join(diff)
    print result