title: Python Difflib - How to Get SDiff Sequences with "Change" Op
body: <p>I am reading the documentation for Python's <a href="http://docs.python.org/2/library/difflib.html" rel="nofollow">difllib</a>.  According to the docs each, Differ delta gives a sequence</p>
  
  <pre><code>Code    Meaning
  '- '    line unique to sequence 1
  '+ '    line unique to sequence 2
  '  '    line common to both sequences
  '? '    line not present in either input sequence 
  </code></pre>
  
  <p>But what about the "Change" operation?  How do I get a "c " instruction similar to the results in Perl's  <a href="https://metacpan.org/module/Algorithm::Diff#sdiff" rel="nofollow">sdiff</a>?</p>