title: Find sum of right and left hand of list element in python
body: <p>Is there any way for compare sum of left and right of a selected element in a list?
  For example:</p>
  
  <pre><code>li = [2,3,0,9,6]
  if selected item is '0', I want to compare sum of 2,3 and 9,6
  </code></pre>
  
  <p>Thanks in advance</p>