有效的括号

实现思路

• 设立判定条件
• 遍历的范围

代码实现

class Solution(object):def isValid(self, s):""":type s: str:rtype: bool"""n=len(s)for i in range(0,n-1):if s[i]=='(' and s[i+1]!=')':return Falseif s[i]=='[' and s[i+1]!=']':return Falseif s[i]=='{' and s[i+1]!='}':return Falsereturn True