title: how to change [1,2,3,4] to '1234' using python
body: <p>How do I convert a list of <code>int</code>s to a single string, such that:</p>
  
  <p><code>[1, 2, 3, 4]</code> becomes <code>'1234'</code><br>
  <code>[10, 11, 12, 13]</code> becomes <code>'10111213'</code></p>
  
  <p>... etc...</p>