title: Python: How to add tuple to an empty list?
body: <p>I've looked around at other posts on here for a solution to my problem but none of them seems to work for me. I want to append a tuple to (what starts out as) an empty list. I've checked my code and it looks like whenever I try to just append my tuple it turns the list into a NoneType object. Here's what I've got:</p>
  
  <pre><code>list_of_pairs = []
  for player in standings:
      opponent = standings[standings.index(player) + 1]
      matchup = (player[0:2] + opponent[0:2])
      list_of_pairs = list_of_pairs.append(matchup)
      print "ADDED TO LIST: " + str(list_of_pairs)
  </code></pre>
  
  <p>Each <code>player</code> in the standings list contains a tuple with four elements. I've tried using index and re-assigning <code>list_of_pairs = [list_of_pairs, matchup]</code>, but nothing seems to be returning the right thing (i.e. <code>[(player),(next player), (another player), (etc.)]</code>. Every time I print "added to list" I just get <code>ADDED TO LIST: None</code>. I've checked <code>matchup</code> as well and it's definitely storing the first two values of the respective players fine. Any ideas?</p>