title: Find unique elements in tuples in a python list
body: <p>Is there a better way to do this in python, or rather: Is this a good way to do it?</p>
  
  <pre><code>x = ('a', 'b', 'c')
  y = ('d', 'e', 'f')
  z = ('g', 'e', 'i')
  
  l = [x, y, z]
  
  s = set([e for (_, e, _) in l])
  </code></pre>
  
  <p>I looks somewhat ugly but does what i need without writing a complex "get_unique_elements_from_tuple_list" function... ;)</p>
  
  <p>edit: expected value of s is set(['b','e'])</p>