title: Sum all elements having the same index in different lists
body: <pre><code>score=[
   ['5.00', '4.30', '2.50', '3.60', '1.30', '5.00'],
   ['80.00', '8.00', '32.00', '13.60', '20.00', '80.00'], 
   ['12.00', '6.00', '7.20', '8.40', '9.60', '12.00'],
   ['3.00', '1.20', '2.04', '1.08', '0.84', '3.00']
  ]
  </code></pre>
  
  <p>I want </p>
  
  <pre><code>a = 5 + 80 + 12 + 3   # add first element of all lists in score
  b = 4.3 + 8 + 6 + 1.2   # add second element of all lists in score
  c = 2.5 + 32 + 7.2 + 2.04  # etc ...
  d = 3.6 + 13.6 + 8.4 + 1.08  # ...
  e = 1.3 + 20 + 9.6 + 0.84
  f = 5 + 80 + 12 + 3
  </code></pre>
  
  <p>But I don't know how many lists are in <code>score</code>, so I can't use <code>zip()</code>. How do I sum all elements having the same index in different lists in python?</p>