Comparing two .txt files showing common words or phrases

Question

我正在尝试比较两个.txt文件，并找出两者中的每个常用词（忽略大小写。如果有人可以将我指向正确的方向，这会有所帮助。（我没有任何python编写经验，只是编辑一些脚本）

Answer 1

This will give you list containing common words from two files. Output format is list.

with open('a','r') as f, open('b','r') as g:
  l=f.readlines()
  l1=g.readlines()
  print list(set(l)&set(l1))