diff --git a/problems/0090.子集II.md b/problems/0090.子集II.md
index 6b12a95b..71aef5c7 100644
--- a/problems/0090.子集II.md
+++ b/problems/0090.子集II.md
@@ -208,7 +208,23 @@ class Solution {
 ```
 
 Python：
-
+```python3
+class Solution:
+    def subsetsWithDup(self, nums: List[int]) -> List[List[int]]:
+        res = []  #存放符合条件结果的集合
+        path = []  #用来存放符合条件结果
+        def backtrack(nums,startIndex):
+            res.append(path[:])
+            for i in range(startIndex,len(nums)):
+                if i > startIndex and nums[i] == nums[i - 1]:  #我们要对同一树层使用过的元素进行跳过
+                    continue
+                path.append(nums[i])
+                backtrack(nums,i+1)  #递归
+                path.pop()  #回溯
+        nums = sorted(nums)  #去重需要排序
+        backtrack(nums,0)
+        return res
+```
 
 Go：
 ```Go