title: Print a sorted list
body: <p>Why executing the following:</p>
  
  <pre><code>print([7,1,0].sort())
  </code></pre>
  
  <p>produces:</p>
  
  <pre><code>None
  </code></pre>
  
  <p>while executing the following:</p>
  
  <pre><code>a = [7,1,0]
  a.sort()
  print(a)
  </code></pre>
  
  <p>produces:</p>
  
  <pre><code>[0, 1, 7]
  </code></pre>
  
  <p>?</p>