new_contents: # -*- coding:utf8 -*-
  from __future__ import division
  import codecs
  import re
  
  def setASubSetB(file1, file2, outFile):
      '''
      求两个文件的差集，属于file1，并且不属于file2
      原理：将两个文件中内容均读入到内存中，利用python set 数据结构进行集合减法运算
      缺点：不适合大文件处理
      file1: 文件1
      file2: 文件2
      outFile: 结果输出文件
      '''
      with codecs.open(file1, 'r', 'utf8') as fin1:
          with codecs.open(file2, 'r', 'utf8') as fin2:
              with codecs.open(outFile, 'w', 'utf8') as fout:
                  set1 = set()
                  set2 = set()
                  line1 = fin1.readline()
                  while line1:
                      set1.add(line1)
                      line1 = fin1.readline()
                  line2 = fin2.readline()
                  while line2:
                      set2.add(line2)
                      line2 = fin2.readline()
                  s3 = set1 - set2
                  for val in s3:
                      fout.write(val)
  
  if __name__ == '__main__':
      setASubSetB('testData/src.txt', 'testData/test.txt', 'testData/resu.txt')
subject: add corpusHandle.py