title: Python Add an Item to an Array
body: <p>I have an ndarray that looks like this:</p>
  
  <pre><code>In  [1]: a
  Out [1]: array(['x','y'], dtype=object)
  </code></pre>
  
  <p>Now I wanted to append a "z" to the end of it:</p>
  
  <pre><code>In  [2]: print([a,'z'])
  [array(['x','y'],dtype=object), 'z']
  </code></pre>
  
  <p>Instead, what I want is:</p>
  
  <pre><code>['x','y','z']
  </code></pre>
  
  <p>Any idea?</p>