title: How to retrieve a random k-v pair in a dictionary?
body: <p>the idea is within class Card
  I have dict</p>
  
  <pre><code>pack_of_cards = {'2': 2,'3': 3,'4': 4,'5': 5,'6': 6, \
                   '7': 7,'8': 7,'9': 9,'10': 10,'J': 10, \
                   'D': 10,'K': 10,'T': 10}
  </code></pre>
  
  <p>I need this class to return a random set of key and value as a dict.</p>
  
  <p>For example:</p>
  
  <pre><code>Card() == {'T': 10}
  </code></pre>
  
  <p>Thanks to everyone.</p>