title: Min and Max value in list of tuples
body: <p>I have a list of tuples for which I'm trying to get the min &amp; max values at each index. Index 1 seems to be working correctly. For index 2, however, I'm expecting the value (-2,11), but I get (5, 5) instead. Can anyone explain what's going wrong please? Thank you.</p>
  <pre class="lang-py prettyprint-override"><code>test_list = [(-2, 5), (-1, 5), (0, 6), (0, 7), (0, 7), (1, 8), (2, 9), (2, 9), (3, 10),
  (4, 11), (-1, 4), (0, 5), (0, 5), (0, 6), (1, 7), (2, 7), (2, 8), (3, 9), (4, 9), (5, 10),
  (0, 3), (0, 4), (0, 5), (1, 5), (2, 6), (2, 7), (3, 7), (4, 8), (5, 9), (5, 9), (0, 2),
  (0, 3), (1, 4), (2, 5), (2, 5), (3, 6), (4, 7), (5, 7), (5, 8), (6, 9), (0, 2), (1, 2),
  (2, 3), (2, 4), (3, 5), (4, 5), (5, 6), (5, 7), (6, 7), (7, 8), (1, 1), (2, 2), (2, 2),
  (3, 3), (4, 4), (5, 5), (5, 5), (6, 6), (7, 7), (7, 7), (2, 0), (2, 1), (3, 2), (4, 2),
  (5, 3), (5, 4), (6, 5), (7, 5), (7, 6), (8, 7), (2, 0), (3, 0), (4, 1), (5, 2), (5, 2),
  (6, 3), (7, 4), (7, 5), (8, 5), (9, 6), (3, 0), (4, 0), (5, 0), (5, 1), (6, 2), (7, 2),
  (7, 3), (8, 4), (9, 5), (9, 5), (4, -1), (5, 0), (5, 0), (6, 0), (7, 1), (7, 2), (8, 2),
  (9, 3), (9, 4), (10, 5)]
  
  res1 = max(test_list)[0],min(test_list)[0]  
  res2 = max(test_list)[1],min(test_list)[1]
  
  print (&quot;The min of index 1 :  &quot; +  str(res1))
  print (&quot;The min of index 2 :  &quot; +  str(res2))
  </code></pre>
  <pre><code>#The min of index 1 :  (10, -2)
  #The min of index 2 :  (5, 5)
  </code></pre>