http://openbookproject.net/thinkcs/python/english3e/trees.html

1. Modify print_tree_inorder so that it puts parentheses around every operator and pair of operands. Is the output correct and unambiguous? Are the parentheses always necessary?

1 def print tree inorder(tree): 2 if tree is None: return print tree inorder(tree.left) print (tree.cargo, end-"") print (tree.cargo, end-") print tree 4 inorder(tree.right )