python的包很丰富， difflib是用来做文本比较的，下面是一个使用例子：

import difflib    lines1 = '''  dog  cat  bird  buffalo  gophers  hound  horse  '''.strip().splitlines()    lines2 = '''  cat  dog  bird  buffalo  gopher  horse  mouse  '''.strip().splitlines()    # Changes:  # swapped positions of cat and dog  # changed gophers to gopher  # removed hound  # added mouse    for line in difflib.unified_diff(lines1, lines2, fromfile='file1', tofile='file2', lineterm=''):      print line

输出内容如下：

Outputs the following:    --- file1  +++ file2  @@ -1,7 +1,7 @@  +cat   dog  -cat   bird   buffalo  -gophers  -hound  +gopher   horse  +mouse

这个类库也可以用来比较两个文本文件。