title: Using apply on a column
body: <p>I have a dataframe like this one.</p>
  
  <pre><code>  A B C D E
  0 a b c d e
  1 f g h i j
  2 k l m n o
  3 p q r s t
  </code></pre>
  
  <p>What I'd like is to get a dataframe with each column as a list.</p>
  
  <pre><code>     0
  0 [a, f, k, p]
  1 [b, g, l, q]
  2 [c, h, m, r]
  3 [d, i, o, s]
  4 [e, j, p, t]
  </code></pre>
  
  <p>I'd like to somehow apply a function to each column, converting it to a list and placing it in a new DataFrame. However, apply only operates on individual entries.</p>