from Tree import Node root = Node("a") c1 = Node('b') c2 = Node('c') c3 = Node('d') c4 = Node('e') c5 = Node('f') # root children root.child1 = c1 root.child2 = c2 # c1's child c1.child1 = c3 c1.child2 = c4 # c2's child c2.child1 = c5