title: How to filter a DataFrame column according to tuple index?
body: <p>Here is the old dataframe with my desired output below it.</p>
  <p>Old DataFrame</p>
  <pre><code>Column
  (name,birthday,13)
  (name,birthday,14)
  (name,birthday,13)
  (name,birthday,25)
  (name,birthday,16)
  </code></pre>
  <p>New DataFrame</p>
  <pre><code>Column
  13
  14
  13
  25
  16
  </code></pre>