title: List of list of tuples to pandas dataframe
body: <p>I have this array (it's a result from similarity calcul) it's a list of tuples like this:</p>
  
  <pre><code>example = [[(a,b), (c,d)], [(a1,b1), (c1,d2)] …]
  </code></pre>
  
  <p>In example there is 121044 list of 30 tuples each.</p>
  
  <p>I want to have a pandas Dataframe like of just the second value of the tuples (i.e : b, d, b1, d2) without spending to much time compute it </p>
  
  <p>Do you have any ideas ?</p>