title: python lists, delete content of list1 in list2
body: <p>I have two lists</p>
  <pre class="lang-py prettyprint-override"><code>list1=['value1', 'value2', 'value3']
  list2=['value1', 'value2', 'value3', 'value4', 'value5']
  </code></pre>
  <p>I want to delete the contents of list1 from list2</p>
  <p>Result should be :</p>
  <pre class="lang-py prettyprint-override"><code>['value4', 'value5']
  </code></pre>