title: How to shuffle the order in a list?
body: <p>I would like to shuffle the order of the elements in a list.</p>
  
  <pre><code>from random import shuffle
  words = ['red', 'adventure', 'cat', 'cat']
  shuffled = shuffle(words)
  print(shuffled) # expect new order for, example ['cat', 'red', 'adventure', 'cat']
  </code></pre>
  
  <p>As response I get <code>None</code>, why?</p>