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#!/usr/bin/env python
# -*- coding: utf-8 -*-
class BinaryTree:
def __init__(self, value, left=None, right=None):
self.value = value
self.left = left
self.right = right
def invert(self):
self.left, self.right = self.right, self.left
if self.left:
self.left.invert()
if self.right:
self.right.invert()
def pretty_print(self, padding="", branch_padding=""):
if self.right:
self.right.pretty_print(padding + " ", padding + "|")
print(branch_padding, end="")
if branch_padding:
print("--", end="")
print(self.value)
if self.left:
self.left.pretty_print(padding + " ", padding + "|")
if __name__ == "__main__":
tree = BinaryTree(
1,
BinaryTree(
2,
BinaryTree(4),
BinaryTree(5)
),
BinaryTree(
3,
BinaryTree(6),
BinaryTree(7)
)
)
print("Original tree:")
tree.pretty_print()
tree.invert()
print("\nInverted tree:")
tree.pretty_print()
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