title: How can I subtract 2 string or list in python?
body: <p>I have very large strings in my codes. I would like to detect different characters between the strings. Here is an example what I mean:</p>
  
  <pre><code> a='ababaab'
   b='abaaaaa'
   a=a-b
   print(a)
  </code></pre>
  
  <p>I expect kind of like these; 'bb' or '000b00b' </p>
  
  <p>I know sounds weird but I really need this.</p>