title: How can I compare two lists in python and return not matches
body: <p>I would like to return values from both lists that not in the other one:</p>
  
  <pre><code>bar = [ 1,2,3,4,5 ]
  foo = [ 1,2,3,6 ]
  
  returnNotMatches( a,b )
  </code></pre>
  
  <p>would return </p>
  
  <pre><code>[[ 4,5 ],[ 6 ]]
  </code></pre>