Update 0746.使用最小花费爬楼梯.md

Added python version code

problems/0746.使用最小花费爬楼梯.md

@@ -225,7 +225,16 @@ class Solution {
 ```
 
 Python：
-
+```python
+class Solution:
+    def minCostClimbingStairs(self, cost: List[int]) -> int:
+        dp = [0] * (len(cost))
+        dp[0] = cost[0]
+        dp[1] = cost[1]
+        for i in range(2, len(cost)):
+            dp[i] = min(dp[i - 1], dp[i - 2]) + cost[i]
+        return min(dp[len(cost) - 1], dp[len(cost) - 2])
+```
 
 Go：
 ```Go