title: How to find the list in a list of lists whose sum of elements is the greatest?
body: <p>I have a list of lists:</p>
  
  <pre><code>x = [[1,2,3], [4,5,6], [7,8,9], [2,2,0]]
  </code></pre>
  
  <p>I want to get the list whose sum of its elements is the greatest in the list. In this case <code>[7,8,9]</code>.</p>
  
  <p>I'd rather have a fancy <code>map</code> or <code>lambda</code> or list comprehension method than a <code>for/while/if</code> loop. </p>
  
  <p>Best Regards</p>