diff --git a/problems/0704.二分查找.md b/problems/0704.二分查找.md
index 53f5331a..51f48267 100644
--- a/problems/0704.二分查找.md
+++ b/problems/0704.二分查找.md
@@ -220,7 +220,8 @@ class Solution:
 
 （版本二）左闭右开区间
 
-```class Solution:
+```python
+class Solution:
     def search(self, nums: List[int], target: int) -> int:
         if nums is None or len(nums)==0:
             return -1