title: Convert string representation of list into list
body: <pre><code>list_string = "[1,3,4,6]"
  </code></pre>
  
  <p>I tried <code>list_string[1:-1]</code> but it is giving <code>1,3,4,6</code>.
  I also tried <code>list_string.split(',')</code> but again the brackets will be appended to first and last element i.e <code>'[1' , '3' , '4' , '6]'</code> </p>
  
  <p>I can iterate over all the items and remove brackets from 1st and last element.
  But what is the best and simple way to do this?</p>