title: how to print max size of list inside a list
body: <p>For example:</p>
  
  <pre><code>alist=[[(0, 0), (0, 1), (1, 1), (1, 2), (2, 2), (2, 1), (2, 0), (1, 0), (3, 0)], 
  [(0, 2), (0, 3), (1, 3)],
  [(0, 4), (1, 4), (2, 4), (0, 5), (0, 6), (1, 6), (2, 6), (3, 6)],
  [(1, 5)],
  [(2, 3), (3, 3), (3, 4), (3, 5), (2, 5), (3, 2), (3, 1)]]
  
  for i in dlist:
      print(len(i))
      print(max(len(i)))  #this gives me error
  </code></pre>
  
  <p>output:</p>
  
  <pre><code>5
  9
  3
  8
  1
  7
  </code></pre>
  
  <p>I wanted to print out 9 as my output from the above list. How am I able to print the result?</p>