title: Pythonic difference between two dates in years?
body: <p>Is there a more efficient way of doing this below? I want to have the difference in years between two dates as a single scalar. Any suggestions are welcome.</p>
  
  <pre><code>from datetime import datetime
  start_date = datetime(2010,4,28,12,33)
  end_date = datetime(2010,5,5,23,14)
  difference  = end_date - start_date
  difference_in_years = (difference.days + difference.seconds/86400)/365.2425
  </code></pre>