title: Python convert tuple to array
body: <p>How can I convert at 3-Dimensinal tuple into an array</p>
  
  <pre><code>a = []
  a.append((1,2,4))
  a.append((2,3,4))
  </code></pre>
  
  <p>in a array like:</p>
  
  <pre><code>b = [1,2,4,2,3,4]
  </code></pre>