title: How to create a dictionary of two pandas DataFrame columns
body: <p>What is the most efficient way to organise the following pandas Dataframe:</p>
  
  <p>data =</p>
  
  <pre><code>Position    Letter
  1           a
  2           b
  3           c
  4           d
  5           e
  </code></pre>
  
  <p>into a dictionary like <code>alphabet[1 : 'a', 2 : 'b', 3 : 'c', 4 : 'd', 5 : 'e']</code>?</p>