diff --git a/problems/二叉树的迭代遍历.md b/problems/二叉树的迭代遍历.md
index 35cf4077..8b241465 100644
--- a/problems/二叉树的迭代遍历.md
+++ b/problems/二叉树的迭代遍历.md
@@ -258,7 +258,9 @@ class Solution:
             if node.left:
                 stack.append(node.left)
         return result
-        
+```
+```python
+
 # 中序遍历-迭代-LC94_二叉树的中序遍历
 class Solution:
     def inorderTraversal(self, root: TreeNode) -> List[int]:
@@ -279,7 +281,9 @@ class Solution:
                 # 取栈顶元素右结点
                 cur = cur.right	
         return result
-        
+ ```
+ ```python
+
 # 后序遍历-迭代-LC145_二叉树的后序遍历
 class Solution:
     def postorderTraversal(self, root: TreeNode) -> List[int]: