Update 0096.不同的二叉搜索树.md

Added python version code

problems/0096.不同的二叉搜索树.md

@@ -186,7 +186,16 @@ class Solution {
 ```
 
 Python：
-
+```python
+class Solution:
+    def numTrees(self, n: int) -> int:
+        dp = [0] * (n + 1)
+        dp[0], dp[1] = 1, 1
+        for i in range(2, n + 1):
+            for j in range(1, i + 1):
+                dp[i] += dp[j - 1] * dp[i - j]
+        return dp[-1]
+```
 
 Go：
 ```Go