Update 0102.二叉树的层序遍历.md

# LeetCode 429. N-ary Tree Level Order Traversal 
python, 递归法

problems/0102.二叉树的层序遍历.md

@@ -1346,6 +1346,22 @@ class Solution:
         return results
 ```
 
+```python
+# LeetCode 429. N-ary Tree Level Order Traversal
+# 递归法
+class Solution:
+    def levelOrder(self, root: 'Node') -> List[List[int]]:
+        if not root: return []
+        result=[]
+        def traversal(root,depth):
+            if len(result)==depth:result.append([])
+            result[depth].append(root.val)
+            if root.children: 
+                for i in range(len(root.children)):traversal(root.children[i],depth+1)
+            
+        traversal(root,0)
+        return result        
+```
 java:
 
 ```java