title: AttributeError: 'list' object has no attribute 'sort_values'
body: <p>At work we recently upgraded to pandas 0.20 and I have a list of numbers that I sort using sort (however this is no longer supported and I am getting the above message when I try <code>sort_values</code>).</p>
  <pre><code>numbers = [1, 3, 4, 2] 
  numbers.sort(reverse = True) 
  print numbers
  
  [4, 3, 2, 1]
  
  numbers.sort_values(reverse = True)
  </code></pre>
  <p>I'm getting this error :</p>
  <blockquote>
  <p>Traceback (most recent call last):</p>
  <p>File &quot;&quot;, line 1, in </p>
  <p>AttributeError: 'list' object has no attribute 'sort_values'</p>
  </blockquote>