title: Random.sample with size of returned list being random also?
body: <p>When using the <code>random.sample(sequence, k)</code>, how do you make the sample size <code>k</code> random? </p>
  
  <p>example:</p>
  
  <pre><code>mylist = [1,2,3,4,5]
  
  random.sample(mylist, 2) 
  </code></pre>
  
  <p>This would return two random numbers from my list. How do I make the the number of items returned random? </p>