title: How this expression is going to sort the results sorted(list1 ,key = lambda x:-x[0])
body: <pre><code>data = sorted(zip(list1,list2),key = lambda x:-x[0])
  </code></pre>
  <p>how this expression is going to sort the results . if we have used x[0] and x[-1] the results would be forward and backward but here we are using -x[0].</p>