title: Mapping string list to pandas column?
body: <p>Just curios  better way to map pandas column against a list.</p>
  <pre><code>ref_list=['a','b','c','d']
  lst = [0,2,1]
  df = pd.DataFrame(lst,columns=['no'])
  </code></pre>
  <p>expected output</p>
  <pre><code>   no map
  0   0  a
  1   2  c
  2   1  b
  </code></pre>