title: Extract new dictionary from a list of dictionaries
body: <p>I have a list of dictionaries, I would like to create a new dictionary where the first key <code>'value'</code> corresponds to the second value of the <code>'b'</code> key of each dictionary in the list. The second key <code>'number'</code> of the new dictionary corresponds to the third (therefore last) value of the <code>'b'</code> key of each dictionary in the list.</p>
  
  <pre><code>my_list = [
      {
          'a': (2.6, 0.08, 47.0, 1),
          'b': (5.7, 0.05, 1)
      },
      {
          'a': (2.6, 0.08, 47.0, 2),
          'b': (5.7, 0.06, 2)
      }
  ]
  </code></pre>
  
  <p>expected output:</p>
  
  <pre><code>new_dic = {'value': (0.05, 0.06), number = (1, 2)}
  </code></pre>