title: joining lists of lists into same index
body: <p>I have two lists of lists that I am joining using:</p>
  
  <pre><code>list1 = [[],["1","3","4"],["0"],["1","2","5","4"]]
  list2 = [["1","2","3"],["8","7","6"],[],["9","8","6","4"]]
  
  for (v, c) in zip(list1, list2):
      joined_list =sorted(set(v + c))
  </code></pre>
  
  <p>This currently puts the values into the end of the list, I want it to go into the same index that they are currently in whats the best way to do this ?</p>
  
  <p>EDIT: forgot that they are strings, the code is here
  <a href="https://github.com/ishikawa-rei/EPRO-CALC/blob/master/massaging.py" rel="nofollow noreferrer">https://github.com/ishikawa-rei/EPRO-CALC/blob/master/massaging.py</a>
  its the first function and gets input of two lists</p>