diff --git a/problems/0454.四数相加II.md b/problems/0454.四数相加II.md
index 835178dd..0621ab5b 100644
--- a/problems/0454.四数相加II.md
+++ b/problems/0454.四数相加II.md
@@ -120,7 +120,7 @@ class Solution {
 
 Python：
 
-```
+```python
 class Solution(object):
     def fourSumCount(self, nums1, nums2, nums3, nums4):
         """
@@ -147,7 +147,31 @@ class Solution(object):
                 if key in hashmap:
                     count += hashmap[key]
         return count
+ 
+# 下面这个写法更为简洁，但是表达的是同样的算法
+# class Solution:
+#     def fourSumCount(self, nums1: List[int], nums2: List[int], nums3: List[int], nums4: List[int]) -> int:
+#         from collections import defaultdict
+
+#         hashmap = defaultdict(int)
+
+#         for x1 in nums1:
+#             for x2 in nums2:
+#                 hashmap[x1+x2] += 1
+        
+#         count=0
+#         for x3 in nums3:
+#             for x4 in nums4:
+#                 key = -x3-x4
+#                 value = hashmap.get(key)
+
+                  # dict的get方法会返回None（key不存在）或者key对应的value
+                  # 所以如果value==0，就会继续执行or，count+0，否则就会直接加value
+                  # 这样就不用去写if判断了
+            
+#                 count += value or 0
                 
+#         return count
 
 ```