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添加leetcode 226翻转二叉树python后序递归代码

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Original file line number	Diff line number	Diff line change
`@@ -322,6 +322,18 @@ class Solution:`
`322`	`322`	`return root`
`323`	`323`	```
`324`	`324`
	`325`	`+递归法:后序遍历:`
	`326`	+```python
	`327`	`+class Solution:`
	`328`	`+ def invertTree(self, root: TreeNode) -> TreeNode:`
	`329`	`+ if root is None:`
	`330`	`+ return None`
	`331`	`+ self.invertTree(root.left)`
	`332`	`+ self.invertTree(root.right)`
	`333`	`+ root.left, root.right = root.right, root.left`
	`334`	`+ return root`
	`335`	+```
	`336`	`+`
`325`	`337`	`迭代法:深度优先遍历(前序遍历):`
`326`	`338`	```python
`327`	`339`	`class Solution:`

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