diff --git a/problems/0102.二叉树的层序遍历.md b/problems/0102.二叉树的层序遍历.md
index 0f9b2df6..dc386684 100644
--- a/problems/0102.二叉树的层序遍历.md
+++ b/problems/0102.二叉树的层序遍历.md
@@ -1532,6 +1532,29 @@ Java：
 
 
 Python：
+```python 3
+class Solution:
+    def maxDepth(self, root: TreeNode) -> int:
+        if root == None:
+            return 0
+        
+        queue_ = [root]
+        result = []
+        while queue_:
+            length = len(queue_)
+            sub = []
+            for i in range(length):
+                cur = queue_.pop(0)
+                sub.append(cur.val)
+                #子节点入队列
+                if cur.left: queue_.append(cur.left)
+                if cur.right: queue_.append(cur.right)
+            result.append(sub)
+            
+
+        return len(result)
+```
+
 
 Go：