diff --git a/problems/0020.有效的括号.md b/problems/0020.有效的括号.md
index e8784397..f2d78ade 100644
--- a/problems/0020.有效的括号.md
+++ b/problems/0020.有效的括号.md
@@ -141,7 +141,20 @@ Java：
 
 
 Python：
-
+```python3
+class Solution:
+    def isValid(self, s: str) -> bool:
+        stack = []  # 保存还未匹配的左括号
+        mapping = {")": "(", "]": "[", "}": "{"}
+        for i in s:
+            if i in "([{":  # 当前是左括号，则入栈
+                stack.append(i)
+            elif stack and stack[-1] == mapping[i]:  # 当前是配对的右括号则出栈
+                stack.pop()
+            else:  # 不是匹配的右括号或者没有左括号与之匹配，则返回false
+                return False
+        return stack == []  # 最后必须正好把左括号匹配完
+```
 
 Go：