Update 0654.最大二叉树.md

added python version of code

problems/0654.最大二叉树.md

@@ -256,7 +256,25 @@ class Solution {
 ```
 
 Python：
-
+```python
+# 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
+//递归法
+class Solution:
+    def constructMaximumBinaryTree(self, nums: List[int]) -> TreeNode:
+        if not nums: return None   //终止条件
+        root = TreeNode(max(nums))   //新建节点
+        p = nums.index(root.val)   //找到最大值位置
+        if p > 0: //保证有左子树
+            root.left = self.constructMaximumBinaryTree(nums[:p])   //递归
+        if p < len(nums): //保证有右子树
+            root.right = self.constructMaximumBinaryTree(nums[p+1:])  //递归
+        return root
+```
 
 Go：