python实现比较文件内容异同

import sys
import difflib
import time
import os
"""
创作时间：2017-10-08 23:30 09
版本： 1.0.0
"""
def main():
  """主函数"""
  try:
    f1 = sys.argv[1]#获取文件名
    f2 = sys.argv[2]
  except Exception as e:
    print("Error: "+ str(e))
    print("Usage : python compareFile.py filename1 filename2")
    sys.exit()

  if f1 == "" or f2 == "":#参数不够
    print("Usage : python compareFile.py filename1 filename2")
    sys.exit()

  tf1 = readFile(f1)
  tf2 = readFile(f2)

  d = difflib.HtmlDiff()#创建一个实例difflib.HtmlDiff
  writeFile(d.make_file(tf1,tf2))#生成一个比较后的报告文件，格式为html

def readFile(filename):
  """读取文件，并处理"""
  try:
    fileHandle = open(filename, "r")
    text = fileHandle.read().splitlines()
    fileHandle.close()
    return text
  except IOError as e:
    print("Read file error: "+ str(e))
    sys.exit()

def writeFile(file):
  """写入文件"""
  diffFile = open('diff_{}_.html'.format(time.strftime("%Y_%m_%d_%H_%M_%S",time.localtime())), "w")
  diffFile.write("<meta charset='UTF-8'>")
  diffFile.write(file)
  print("The file on {}".format(os.path.abspath(str(diffFile.name))))#提示文件生成在什么地方
  diffFile.close()


if __name__ == "__main__":
  main()