Ep6_invert_binary_tree.py

'''
Leetcode #226. Invert Binary Tree (https://leetcode.com/problems/invert-binary-tree/)

'''
# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right
class Solution:
    def invertTree(self, root: TreeNode) -> TreeNode:
        if root is not None:
            root.left, root.right = self.invertTree(root.right), self.invertTree(root.left)
        
        return root