title: Time difference in Python 2.7
body: <p>Given two time points </p>
  
  <pre><code>t_1 = (hour_1, minute_1)
  t_2 = (hour_2, minute_2)
  </code></pre>
  
  <p>How can I get the absolute time difference in minutes in Python 2.7, where 
  I assume that <code>t_2</code> is later than <code>t_1</code>, so if:</p>
  
  <pre><code>t_2 = (0, 3) and t_1 = (23, 59) 
  </code></pre>
  
  <p>the difference would be 4 Minutes.</p>