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Merge pull request #167 from charon2121/master

添加 94 144 145 python3版本

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problems
- 二叉树的递归遍历.md

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`‎problems/二叉树的递归遍历.md‎`

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Original file line number	Diff line number	Diff line change
`@@ -170,7 +170,53 @@ class Solution {`
`170`	`170`	```
`171`	`171`
`172`	`172`	`Python:`
`173`		`-`
	`173`	+```python3
	`174`	`+# 前序遍历-递归-LC144_二叉树的前序遍历`
	`175`	`+class Solution:`
	`176`	`+ def preorderTraversal(self, root: TreeNode) -> List[int]:`
	`177`	`+ # 保存结果`
	`178`	`+ result = []`
	`179`	`+`
	`180`	`+ def traversal(root: TreeNode):`
	`181`	`+ if root == None:`
	`182`	`+ return`
	`183`	`+ result.append(root.val) # 前序`
	`184`	`+ traversal(root.left) # 左`
	`185`	`+ traversal(root.right) # 右`
	`186`	`+`
	`187`	`+ traversal(root)`
	`188`	`+ return result`
	`189`	`+`
	`190`	`+# 中序遍历-递归-LC94_二叉树的中序遍历`
	`191`	`+class Solution:`
	`192`	`+ def inorderTraversal(self, root: TreeNode) -> List[int]:`
	`193`	`+ result = []`
	`194`	`+`
	`195`	`+ def traversal(root: TreeNode):`
	`196`	`+ if root == None:`
	`197`	`+ return`
	`198`	`+ traversal(root.left) # 左`
	`199`	`+ result.append(root.val) # 中序`
	`200`	`+ traversal(root.right) # 右`
	`201`	`+`
	`202`	`+ traversal(root)`
	`203`	`+ return result`
	`204`	`+`
	`205`	`+# 后序遍历-递归-LC145_二叉树的后序遍历`
	`206`	`+class Solution:`
	`207`	`+ def postorderTraversal(self, root: TreeNode) -> List[int]:`
	`208`	`+ result = []`
	`209`	`+`
	`210`	`+ def traversal(root: TreeNode):`
	`211`	`+ if root == None:`
	`212`	`+ return`
	`213`	`+ traversal(root.left) # 左`
	`214`	`+ traversal(root.right) # 右`
	`215`	`+ result.append(root.val) # 后序`
	`216`	`+`
	`217`	`+ traversal(root)`
	`218`	`+ return result`
	`219`	+```
`174`	`220`
`175`	`221`	`Go:`
`176`	`222`

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