diff --git a/problems/0309.最佳买卖股票时机含冷冻期.md b/problems/0309.最佳买卖股票时机含冷冻期.md
index 44ca2b26..4667c122 100644
--- a/problems/0309.最佳买卖股票时机含冷冻期.md
+++ b/problems/0309.最佳买卖股票时机含冷冻期.md
@@ -189,6 +189,21 @@ class Solution {
 
 Python：
 
+```python
+class Solution:
+    def maxProfit(self, prices: List[int]) -> int:
+        n = len(prices)
+        if n == 0:
+            return 0
+        dp = [[0] * 4 for _ in range(n)]
+        dp[0][0] = -prices[0] #持股票
+        for i in range(1, n):
+            dp[i][0] = max(dp[i-1][0], max(dp[i-1][3], dp[i-1][1]) - prices[i])
+            dp[i][1] = max(dp[i-1][1], dp[i-1][3])
+            dp[i][2] = dp[i-1][0] + prices[i]
+            dp[i][3] = dp[i-1][2]
+        return max(dp[n-1][3], dp[n-1][1], dp[n-1][2])
+```
 
 Go：