title: Why do we get a 'None' item when appending an item to an existing list?
body: <p>Use case:<br>
  I want to append a new item along with all the existing items in a list to the same list.<br>
  Ex: </p>
  
  <pre><code>list = [ 'a', 'b', 'c']
  </code></pre>
  
  <p>Appending <code>'d'</code>, expecting the output as: <code>['a', 'b', 'c', 'a', 'b', 'c', 'd']</code></p>
  
  <p>My code:</p>
  
  <pre><code>list.append(list.append('d'))
  </code></pre>
  
  <p>Current output: </p>
  
  <pre><code>['a', 'b', 'c', 'd', None]
  </code></pre>
  
  <p>Why am I getting a <code>None</code> item here and how can I print the list as expected?</p>