title: How to sum up two different nested lists?
body: <pre><code>list_a = [[[1.1, 2.2],
             [3.3, 4.4]],
            [[5.5, 6.6],
             [7.7, 8.8]]]
  
  list_b = [[1.1, 2.2],
            [3.3, 4.4]]
  </code></pre>
  <p>I just want to sum the list <code>[[1.1, 2.2], [3.3, 4.4]]</code> in the list_a with the list <code>[1.1, 2.2]</code> in list_b</p>
  <p>For example: <code>1.1+1.1, 2.2+1.1</code> then <code>3.3+2.2, 4.4+2.2</code>. After that the output will store back to an empty list. <code>result = [[2.2, 3.3], [5.5,6.6]]</code>.</p>
  <p>I don't really know how to solve this question with for-loop.</p>