题解 | #有效括号序列#

#
# 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
#
#
# @param s string字符串
# @return bool布尔型
#
class Solution:
    def isValid(self, s: str) -> bool:
        # write code here
        seq = ["(", "{", "["]
        ret = list()
        if len(s) < 1:
            return False

        try:
            for i in s:
                if i in seq:
                    ret.append(i)
                elif i == ")":
                    if "(" != ret.pop():
                        return False
                elif i == "]":
                    if "[" != ret.pop():
                        return False
                elif i == "}":
                    if "{" != ret.pop():
                        return False
            if len(ret) != 0:
                return False
            else:
                return True
        except:
            return False