RosettaCodeData/Task/Visualize-a-tree/Python/visualize-a-tree-3.py

>>> pprint(tree, width=60)
('a',
 ('b0',
  ('c1',
   'c2',
   ('d', ('ef', 'gh')),
   'c3',
   ('i1', 'i2', 'i3', 'jj', 'i4', ('kk', 'm'))),
  'b1',
  ('C1', 'C2', ('D1', 'E', 'D2', 'D3'), 'C3')))
>>>